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98b04dd0b4
pci_device_is_present() previously didn't work for VFs because it reads the Vendor and Device ID, which are 0xffff for VFs, which looks like they aren't present. Check the PF instead. Wei Gong reported that if virtio I/O is in progress when the driver is unbound or "0" is written to /sys/.../sriov_numvfs, the virtio I/O operation hangs, which may result in output like this: task:bash state:D stack: 0 pid: 1773 ppid: 1241 flags:0x00004002 Call Trace: schedule+0x4f/0xc0 blk_mq_freeze_queue_wait+0x69/0xa0 blk_mq_freeze_queue+0x1b/0x20 blk_cleanup_queue+0x3d/0xd0 virtblk_remove+0x3c/0xb0 [virtio_blk] virtio_dev_remove+0x4b/0x80 ... device_unregister+0x1b/0x60 unregister_virtio_device+0x18/0x30 virtio_pci_remove+0x41/0x80 pci_device_remove+0x3e/0xb0 This happened because pci_device_is_present(VF) returned "false" in virtio_pci_remove(), so it called virtio_break_device(). The broken vq meant that vring_interrupt() skipped the vq.callback() that would have completed the virtio I/O operation via virtblk_done(). [bhelgaas: commit log, simplify to always use pci_physfn(), add stable tag] Link: https://lore.kernel.org/r/20221026060912.173250-1-mst@redhat.com Reported-by: Wei Gong <gongwei833x@gmail.com> Tested-by: Wei Gong <gongwei833x@gmail.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Cc: stable@vger.kernel.org
6931 lines
181 KiB
C
6931 lines
181 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* PCI Bus Services, see include/linux/pci.h for further explanation.
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*
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* Copyright 1993 -- 1997 Drew Eckhardt, Frederic Potter,
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* David Mosberger-Tang
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*
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* Copyright 1997 -- 2000 Martin Mares <mj@ucw.cz>
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*/
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#include <linux/acpi.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/dmi.h>
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#include <linux/init.h>
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#include <linux/msi.h>
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#include <linux/of.h>
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#include <linux/pci.h>
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#include <linux/pm.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include <linux/string.h>
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#include <linux/log2.h>
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#include <linux/logic_pio.h>
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#include <linux/pm_wakeup.h>
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#include <linux/interrupt.h>
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#include <linux/device.h>
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#include <linux/pm_runtime.h>
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#include <linux/pci_hotplug.h>
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#include <linux/vmalloc.h>
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#include <asm/dma.h>
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#include <linux/aer.h>
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#include <linux/bitfield.h>
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#include "pci.h"
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DEFINE_MUTEX(pci_slot_mutex);
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const char *pci_power_names[] = {
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"error", "D0", "D1", "D2", "D3hot", "D3cold", "unknown",
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};
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EXPORT_SYMBOL_GPL(pci_power_names);
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#ifdef CONFIG_X86_32
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int isa_dma_bridge_buggy;
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EXPORT_SYMBOL(isa_dma_bridge_buggy);
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#endif
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int pci_pci_problems;
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EXPORT_SYMBOL(pci_pci_problems);
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unsigned int pci_pm_d3hot_delay;
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static void pci_pme_list_scan(struct work_struct *work);
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static LIST_HEAD(pci_pme_list);
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static DEFINE_MUTEX(pci_pme_list_mutex);
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static DECLARE_DELAYED_WORK(pci_pme_work, pci_pme_list_scan);
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struct pci_pme_device {
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struct list_head list;
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struct pci_dev *dev;
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};
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#define PME_TIMEOUT 1000 /* How long between PME checks */
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static void pci_dev_d3_sleep(struct pci_dev *dev)
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{
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unsigned int delay_ms = max(dev->d3hot_delay, pci_pm_d3hot_delay);
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unsigned int upper;
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if (delay_ms) {
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/* Use a 20% upper bound, 1ms minimum */
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upper = max(DIV_ROUND_CLOSEST(delay_ms, 5), 1U);
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usleep_range(delay_ms * USEC_PER_MSEC,
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(delay_ms + upper) * USEC_PER_MSEC);
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}
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}
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bool pci_reset_supported(struct pci_dev *dev)
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{
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return dev->reset_methods[0] != 0;
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}
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#ifdef CONFIG_PCI_DOMAINS
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int pci_domains_supported = 1;
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#endif
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#define DEFAULT_CARDBUS_IO_SIZE (256)
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#define DEFAULT_CARDBUS_MEM_SIZE (64*1024*1024)
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/* pci=cbmemsize=nnM,cbiosize=nn can override this */
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unsigned long pci_cardbus_io_size = DEFAULT_CARDBUS_IO_SIZE;
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unsigned long pci_cardbus_mem_size = DEFAULT_CARDBUS_MEM_SIZE;
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#define DEFAULT_HOTPLUG_IO_SIZE (256)
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#define DEFAULT_HOTPLUG_MMIO_SIZE (2*1024*1024)
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#define DEFAULT_HOTPLUG_MMIO_PREF_SIZE (2*1024*1024)
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/* hpiosize=nn can override this */
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unsigned long pci_hotplug_io_size = DEFAULT_HOTPLUG_IO_SIZE;
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/*
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* pci=hpmmiosize=nnM overrides non-prefetchable MMIO size,
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* pci=hpmmioprefsize=nnM overrides prefetchable MMIO size;
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* pci=hpmemsize=nnM overrides both
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*/
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unsigned long pci_hotplug_mmio_size = DEFAULT_HOTPLUG_MMIO_SIZE;
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unsigned long pci_hotplug_mmio_pref_size = DEFAULT_HOTPLUG_MMIO_PREF_SIZE;
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#define DEFAULT_HOTPLUG_BUS_SIZE 1
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unsigned long pci_hotplug_bus_size = DEFAULT_HOTPLUG_BUS_SIZE;
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/* PCIe MPS/MRRS strategy; can be overridden by kernel command-line param */
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#ifdef CONFIG_PCIE_BUS_TUNE_OFF
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enum pcie_bus_config_types pcie_bus_config = PCIE_BUS_TUNE_OFF;
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#elif defined CONFIG_PCIE_BUS_SAFE
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enum pcie_bus_config_types pcie_bus_config = PCIE_BUS_SAFE;
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#elif defined CONFIG_PCIE_BUS_PERFORMANCE
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enum pcie_bus_config_types pcie_bus_config = PCIE_BUS_PERFORMANCE;
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#elif defined CONFIG_PCIE_BUS_PEER2PEER
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enum pcie_bus_config_types pcie_bus_config = PCIE_BUS_PEER2PEER;
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#else
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enum pcie_bus_config_types pcie_bus_config = PCIE_BUS_DEFAULT;
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#endif
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/*
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* The default CLS is used if arch didn't set CLS explicitly and not
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* all pci devices agree on the same value. Arch can override either
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* the dfl or actual value as it sees fit. Don't forget this is
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* measured in 32-bit words, not bytes.
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*/
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u8 pci_dfl_cache_line_size = L1_CACHE_BYTES >> 2;
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u8 pci_cache_line_size;
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/*
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* If we set up a device for bus mastering, we need to check the latency
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* timer as certain BIOSes forget to set it properly.
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*/
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unsigned int pcibios_max_latency = 255;
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/* If set, the PCIe ARI capability will not be used. */
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static bool pcie_ari_disabled;
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/* If set, the PCIe ATS capability will not be used. */
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static bool pcie_ats_disabled;
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/* If set, the PCI config space of each device is printed during boot. */
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bool pci_early_dump;
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bool pci_ats_disabled(void)
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{
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return pcie_ats_disabled;
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}
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EXPORT_SYMBOL_GPL(pci_ats_disabled);
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/* Disable bridge_d3 for all PCIe ports */
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static bool pci_bridge_d3_disable;
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/* Force bridge_d3 for all PCIe ports */
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static bool pci_bridge_d3_force;
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static int __init pcie_port_pm_setup(char *str)
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{
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if (!strcmp(str, "off"))
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pci_bridge_d3_disable = true;
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else if (!strcmp(str, "force"))
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pci_bridge_d3_force = true;
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return 1;
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}
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__setup("pcie_port_pm=", pcie_port_pm_setup);
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/* Time to wait after a reset for device to become responsive */
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#define PCIE_RESET_READY_POLL_MS 60000
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/**
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* pci_bus_max_busnr - returns maximum PCI bus number of given bus' children
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* @bus: pointer to PCI bus structure to search
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*
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* Given a PCI bus, returns the highest PCI bus number present in the set
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* including the given PCI bus and its list of child PCI buses.
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*/
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unsigned char pci_bus_max_busnr(struct pci_bus *bus)
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{
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struct pci_bus *tmp;
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unsigned char max, n;
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max = bus->busn_res.end;
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list_for_each_entry(tmp, &bus->children, node) {
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n = pci_bus_max_busnr(tmp);
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if (n > max)
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max = n;
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}
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return max;
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}
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EXPORT_SYMBOL_GPL(pci_bus_max_busnr);
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/**
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* pci_status_get_and_clear_errors - return and clear error bits in PCI_STATUS
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* @pdev: the PCI device
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*
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* Returns error bits set in PCI_STATUS and clears them.
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*/
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int pci_status_get_and_clear_errors(struct pci_dev *pdev)
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{
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u16 status;
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int ret;
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ret = pci_read_config_word(pdev, PCI_STATUS, &status);
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if (ret != PCIBIOS_SUCCESSFUL)
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return -EIO;
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status &= PCI_STATUS_ERROR_BITS;
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if (status)
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pci_write_config_word(pdev, PCI_STATUS, status);
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return status;
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}
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EXPORT_SYMBOL_GPL(pci_status_get_and_clear_errors);
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#ifdef CONFIG_HAS_IOMEM
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static void __iomem *__pci_ioremap_resource(struct pci_dev *pdev, int bar,
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bool write_combine)
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{
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struct resource *res = &pdev->resource[bar];
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resource_size_t start = res->start;
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resource_size_t size = resource_size(res);
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/*
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* Make sure the BAR is actually a memory resource, not an IO resource
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*/
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if (res->flags & IORESOURCE_UNSET || !(res->flags & IORESOURCE_MEM)) {
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pci_err(pdev, "can't ioremap BAR %d: %pR\n", bar, res);
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return NULL;
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}
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if (write_combine)
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return ioremap_wc(start, size);
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return ioremap(start, size);
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}
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void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar)
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{
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return __pci_ioremap_resource(pdev, bar, false);
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}
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EXPORT_SYMBOL_GPL(pci_ioremap_bar);
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void __iomem *pci_ioremap_wc_bar(struct pci_dev *pdev, int bar)
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{
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return __pci_ioremap_resource(pdev, bar, true);
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}
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EXPORT_SYMBOL_GPL(pci_ioremap_wc_bar);
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#endif
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/**
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* pci_dev_str_match_path - test if a path string matches a device
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* @dev: the PCI device to test
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* @path: string to match the device against
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* @endptr: pointer to the string after the match
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*
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* Test if a string (typically from a kernel parameter) formatted as a
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* path of device/function addresses matches a PCI device. The string must
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* be of the form:
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*
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* [<domain>:]<bus>:<device>.<func>[/<device>.<func>]*
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*
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* A path for a device can be obtained using 'lspci -t'. Using a path
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* is more robust against bus renumbering than using only a single bus,
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* device and function address.
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*
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* Returns 1 if the string matches the device, 0 if it does not and
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* a negative error code if it fails to parse the string.
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*/
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static int pci_dev_str_match_path(struct pci_dev *dev, const char *path,
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const char **endptr)
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{
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int ret;
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unsigned int seg, bus, slot, func;
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char *wpath, *p;
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char end;
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*endptr = strchrnul(path, ';');
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wpath = kmemdup_nul(path, *endptr - path, GFP_ATOMIC);
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if (!wpath)
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return -ENOMEM;
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while (1) {
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p = strrchr(wpath, '/');
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if (!p)
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break;
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ret = sscanf(p, "/%x.%x%c", &slot, &func, &end);
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if (ret != 2) {
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ret = -EINVAL;
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goto free_and_exit;
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}
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if (dev->devfn != PCI_DEVFN(slot, func)) {
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ret = 0;
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goto free_and_exit;
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}
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/*
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* Note: we don't need to get a reference to the upstream
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* bridge because we hold a reference to the top level
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* device which should hold a reference to the bridge,
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* and so on.
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*/
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dev = pci_upstream_bridge(dev);
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if (!dev) {
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ret = 0;
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goto free_and_exit;
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}
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*p = 0;
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}
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ret = sscanf(wpath, "%x:%x:%x.%x%c", &seg, &bus, &slot,
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&func, &end);
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if (ret != 4) {
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seg = 0;
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ret = sscanf(wpath, "%x:%x.%x%c", &bus, &slot, &func, &end);
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if (ret != 3) {
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ret = -EINVAL;
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goto free_and_exit;
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}
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}
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ret = (seg == pci_domain_nr(dev->bus) &&
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bus == dev->bus->number &&
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dev->devfn == PCI_DEVFN(slot, func));
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free_and_exit:
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kfree(wpath);
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return ret;
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}
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/**
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* pci_dev_str_match - test if a string matches a device
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* @dev: the PCI device to test
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* @p: string to match the device against
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* @endptr: pointer to the string after the match
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*
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* Test if a string (typically from a kernel parameter) matches a specified
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* PCI device. The string may be of one of the following formats:
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*
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* [<domain>:]<bus>:<device>.<func>[/<device>.<func>]*
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* pci:<vendor>:<device>[:<subvendor>:<subdevice>]
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*
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* The first format specifies a PCI bus/device/function address which
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* may change if new hardware is inserted, if motherboard firmware changes,
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* or due to changes caused in kernel parameters. If the domain is
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* left unspecified, it is taken to be 0. In order to be robust against
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* bus renumbering issues, a path of PCI device/function numbers may be used
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* to address the specific device. The path for a device can be determined
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* through the use of 'lspci -t'.
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*
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* The second format matches devices using IDs in the configuration
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* space which may match multiple devices in the system. A value of 0
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* for any field will match all devices. (Note: this differs from
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* in-kernel code that uses PCI_ANY_ID which is ~0; this is for
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* legacy reasons and convenience so users don't have to specify
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* FFFFFFFFs on the command line.)
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*
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* Returns 1 if the string matches the device, 0 if it does not and
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* a negative error code if the string cannot be parsed.
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*/
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static int pci_dev_str_match(struct pci_dev *dev, const char *p,
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const char **endptr)
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{
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int ret;
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int count;
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unsigned short vendor, device, subsystem_vendor, subsystem_device;
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if (strncmp(p, "pci:", 4) == 0) {
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/* PCI vendor/device (subvendor/subdevice) IDs are specified */
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p += 4;
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ret = sscanf(p, "%hx:%hx:%hx:%hx%n", &vendor, &device,
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&subsystem_vendor, &subsystem_device, &count);
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if (ret != 4) {
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ret = sscanf(p, "%hx:%hx%n", &vendor, &device, &count);
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if (ret != 2)
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return -EINVAL;
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subsystem_vendor = 0;
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subsystem_device = 0;
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}
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p += count;
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if ((!vendor || vendor == dev->vendor) &&
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(!device || device == dev->device) &&
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(!subsystem_vendor ||
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subsystem_vendor == dev->subsystem_vendor) &&
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(!subsystem_device ||
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subsystem_device == dev->subsystem_device))
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goto found;
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} else {
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/*
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* PCI Bus, Device, Function IDs are specified
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* (optionally, may include a path of devfns following it)
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*/
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ret = pci_dev_str_match_path(dev, p, &p);
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if (ret < 0)
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return ret;
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else if (ret)
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goto found;
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}
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*endptr = p;
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return 0;
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found:
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*endptr = p;
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return 1;
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}
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static u8 __pci_find_next_cap_ttl(struct pci_bus *bus, unsigned int devfn,
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u8 pos, int cap, int *ttl)
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{
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u8 id;
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u16 ent;
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pci_bus_read_config_byte(bus, devfn, pos, &pos);
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while ((*ttl)--) {
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if (pos < 0x40)
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break;
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pos &= ~3;
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pci_bus_read_config_word(bus, devfn, pos, &ent);
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id = ent & 0xff;
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if (id == 0xff)
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break;
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if (id == cap)
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return pos;
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pos = (ent >> 8);
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}
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return 0;
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}
|
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|
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static u8 __pci_find_next_cap(struct pci_bus *bus, unsigned int devfn,
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u8 pos, int cap)
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{
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int ttl = PCI_FIND_CAP_TTL;
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return __pci_find_next_cap_ttl(bus, devfn, pos, cap, &ttl);
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}
|
|
|
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u8 pci_find_next_capability(struct pci_dev *dev, u8 pos, int cap)
|
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{
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return __pci_find_next_cap(dev->bus, dev->devfn,
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pos + PCI_CAP_LIST_NEXT, cap);
|
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}
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EXPORT_SYMBOL_GPL(pci_find_next_capability);
|
|
|
|
static u8 __pci_bus_find_cap_start(struct pci_bus *bus,
|
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unsigned int devfn, u8 hdr_type)
|
|
{
|
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u16 status;
|
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|
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pci_bus_read_config_word(bus, devfn, PCI_STATUS, &status);
|
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if (!(status & PCI_STATUS_CAP_LIST))
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return 0;
|
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|
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switch (hdr_type) {
|
|
case PCI_HEADER_TYPE_NORMAL:
|
|
case PCI_HEADER_TYPE_BRIDGE:
|
|
return PCI_CAPABILITY_LIST;
|
|
case PCI_HEADER_TYPE_CARDBUS:
|
|
return PCI_CB_CAPABILITY_LIST;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pci_find_capability - query for devices' capabilities
|
|
* @dev: PCI device to query
|
|
* @cap: capability code
|
|
*
|
|
* Tell if a device supports a given PCI capability.
|
|
* Returns the address of the requested capability structure within the
|
|
* device's PCI configuration space or 0 in case the device does not
|
|
* support it. Possible values for @cap include:
|
|
*
|
|
* %PCI_CAP_ID_PM Power Management
|
|
* %PCI_CAP_ID_AGP Accelerated Graphics Port
|
|
* %PCI_CAP_ID_VPD Vital Product Data
|
|
* %PCI_CAP_ID_SLOTID Slot Identification
|
|
* %PCI_CAP_ID_MSI Message Signalled Interrupts
|
|
* %PCI_CAP_ID_CHSWP CompactPCI HotSwap
|
|
* %PCI_CAP_ID_PCIX PCI-X
|
|
* %PCI_CAP_ID_EXP PCI Express
|
|
*/
|
|
u8 pci_find_capability(struct pci_dev *dev, int cap)
|
|
{
|
|
u8 pos;
|
|
|
|
pos = __pci_bus_find_cap_start(dev->bus, dev->devfn, dev->hdr_type);
|
|
if (pos)
|
|
pos = __pci_find_next_cap(dev->bus, dev->devfn, pos, cap);
|
|
|
|
return pos;
|
|
}
|
|
EXPORT_SYMBOL(pci_find_capability);
|
|
|
|
/**
|
|
* pci_bus_find_capability - query for devices' capabilities
|
|
* @bus: the PCI bus to query
|
|
* @devfn: PCI device to query
|
|
* @cap: capability code
|
|
*
|
|
* Like pci_find_capability() but works for PCI devices that do not have a
|
|
* pci_dev structure set up yet.
|
|
*
|
|
* Returns the address of the requested capability structure within the
|
|
* device's PCI configuration space or 0 in case the device does not
|
|
* support it.
|
|
*/
|
|
u8 pci_bus_find_capability(struct pci_bus *bus, unsigned int devfn, int cap)
|
|
{
|
|
u8 hdr_type, pos;
|
|
|
|
pci_bus_read_config_byte(bus, devfn, PCI_HEADER_TYPE, &hdr_type);
|
|
|
|
pos = __pci_bus_find_cap_start(bus, devfn, hdr_type & 0x7f);
|
|
if (pos)
|
|
pos = __pci_find_next_cap(bus, devfn, pos, cap);
|
|
|
|
return pos;
|
|
}
|
|
EXPORT_SYMBOL(pci_bus_find_capability);
|
|
|
|
/**
|
|
* pci_find_next_ext_capability - Find an extended capability
|
|
* @dev: PCI device to query
|
|
* @start: address at which to start looking (0 to start at beginning of list)
|
|
* @cap: capability code
|
|
*
|
|
* Returns the address of the next matching extended capability structure
|
|
* within the device's PCI configuration space or 0 if the device does
|
|
* not support it. Some capabilities can occur several times, e.g., the
|
|
* vendor-specific capability, and this provides a way to find them all.
|
|
*/
|
|
u16 pci_find_next_ext_capability(struct pci_dev *dev, u16 start, int cap)
|
|
{
|
|
u32 header;
|
|
int ttl;
|
|
u16 pos = PCI_CFG_SPACE_SIZE;
|
|
|
|
/* minimum 8 bytes per capability */
|
|
ttl = (PCI_CFG_SPACE_EXP_SIZE - PCI_CFG_SPACE_SIZE) / 8;
|
|
|
|
if (dev->cfg_size <= PCI_CFG_SPACE_SIZE)
|
|
return 0;
|
|
|
|
if (start)
|
|
pos = start;
|
|
|
|
if (pci_read_config_dword(dev, pos, &header) != PCIBIOS_SUCCESSFUL)
|
|
return 0;
|
|
|
|
/*
|
|
* If we have no capabilities, this is indicated by cap ID,
|
|
* cap version and next pointer all being 0.
|
|
*/
|
|
if (header == 0)
|
|
return 0;
|
|
|
|
while (ttl-- > 0) {
|
|
if (PCI_EXT_CAP_ID(header) == cap && pos != start)
|
|
return pos;
|
|
|
|
pos = PCI_EXT_CAP_NEXT(header);
|
|
if (pos < PCI_CFG_SPACE_SIZE)
|
|
break;
|
|
|
|
if (pci_read_config_dword(dev, pos, &header) != PCIBIOS_SUCCESSFUL)
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_find_next_ext_capability);
|
|
|
|
/**
|
|
* pci_find_ext_capability - Find an extended capability
|
|
* @dev: PCI device to query
|
|
* @cap: capability code
|
|
*
|
|
* Returns the address of the requested extended capability structure
|
|
* within the device's PCI configuration space or 0 if the device does
|
|
* not support it. Possible values for @cap include:
|
|
*
|
|
* %PCI_EXT_CAP_ID_ERR Advanced Error Reporting
|
|
* %PCI_EXT_CAP_ID_VC Virtual Channel
|
|
* %PCI_EXT_CAP_ID_DSN Device Serial Number
|
|
* %PCI_EXT_CAP_ID_PWR Power Budgeting
|
|
*/
|
|
u16 pci_find_ext_capability(struct pci_dev *dev, int cap)
|
|
{
|
|
return pci_find_next_ext_capability(dev, 0, cap);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_find_ext_capability);
|
|
|
|
/**
|
|
* pci_get_dsn - Read and return the 8-byte Device Serial Number
|
|
* @dev: PCI device to query
|
|
*
|
|
* Looks up the PCI_EXT_CAP_ID_DSN and reads the 8 bytes of the Device Serial
|
|
* Number.
|
|
*
|
|
* Returns the DSN, or zero if the capability does not exist.
|
|
*/
|
|
u64 pci_get_dsn(struct pci_dev *dev)
|
|
{
|
|
u32 dword;
|
|
u64 dsn;
|
|
int pos;
|
|
|
|
pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_DSN);
|
|
if (!pos)
|
|
return 0;
|
|
|
|
/*
|
|
* The Device Serial Number is two dwords offset 4 bytes from the
|
|
* capability position. The specification says that the first dword is
|
|
* the lower half, and the second dword is the upper half.
|
|
*/
|
|
pos += 4;
|
|
pci_read_config_dword(dev, pos, &dword);
|
|
dsn = (u64)dword;
|
|
pci_read_config_dword(dev, pos + 4, &dword);
|
|
dsn |= ((u64)dword) << 32;
|
|
|
|
return dsn;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_get_dsn);
|
|
|
|
static u8 __pci_find_next_ht_cap(struct pci_dev *dev, u8 pos, int ht_cap)
|
|
{
|
|
int rc, ttl = PCI_FIND_CAP_TTL;
|
|
u8 cap, mask;
|
|
|
|
if (ht_cap == HT_CAPTYPE_SLAVE || ht_cap == HT_CAPTYPE_HOST)
|
|
mask = HT_3BIT_CAP_MASK;
|
|
else
|
|
mask = HT_5BIT_CAP_MASK;
|
|
|
|
pos = __pci_find_next_cap_ttl(dev->bus, dev->devfn, pos,
|
|
PCI_CAP_ID_HT, &ttl);
|
|
while (pos) {
|
|
rc = pci_read_config_byte(dev, pos + 3, &cap);
|
|
if (rc != PCIBIOS_SUCCESSFUL)
|
|
return 0;
|
|
|
|
if ((cap & mask) == ht_cap)
|
|
return pos;
|
|
|
|
pos = __pci_find_next_cap_ttl(dev->bus, dev->devfn,
|
|
pos + PCI_CAP_LIST_NEXT,
|
|
PCI_CAP_ID_HT, &ttl);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pci_find_next_ht_capability - query a device's HyperTransport capabilities
|
|
* @dev: PCI device to query
|
|
* @pos: Position from which to continue searching
|
|
* @ht_cap: HyperTransport capability code
|
|
*
|
|
* To be used in conjunction with pci_find_ht_capability() to search for
|
|
* all capabilities matching @ht_cap. @pos should always be a value returned
|
|
* from pci_find_ht_capability().
|
|
*
|
|
* NB. To be 100% safe against broken PCI devices, the caller should take
|
|
* steps to avoid an infinite loop.
|
|
*/
|
|
u8 pci_find_next_ht_capability(struct pci_dev *dev, u8 pos, int ht_cap)
|
|
{
|
|
return __pci_find_next_ht_cap(dev, pos + PCI_CAP_LIST_NEXT, ht_cap);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_find_next_ht_capability);
|
|
|
|
/**
|
|
* pci_find_ht_capability - query a device's HyperTransport capabilities
|
|
* @dev: PCI device to query
|
|
* @ht_cap: HyperTransport capability code
|
|
*
|
|
* Tell if a device supports a given HyperTransport capability.
|
|
* Returns an address within the device's PCI configuration space
|
|
* or 0 in case the device does not support the request capability.
|
|
* The address points to the PCI capability, of type PCI_CAP_ID_HT,
|
|
* which has a HyperTransport capability matching @ht_cap.
|
|
*/
|
|
u8 pci_find_ht_capability(struct pci_dev *dev, int ht_cap)
|
|
{
|
|
u8 pos;
|
|
|
|
pos = __pci_bus_find_cap_start(dev->bus, dev->devfn, dev->hdr_type);
|
|
if (pos)
|
|
pos = __pci_find_next_ht_cap(dev, pos, ht_cap);
|
|
|
|
return pos;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_find_ht_capability);
|
|
|
|
/**
|
|
* pci_find_vsec_capability - Find a vendor-specific extended capability
|
|
* @dev: PCI device to query
|
|
* @vendor: Vendor ID for which capability is defined
|
|
* @cap: Vendor-specific capability ID
|
|
*
|
|
* If @dev has Vendor ID @vendor, search for a VSEC capability with
|
|
* VSEC ID @cap. If found, return the capability offset in
|
|
* config space; otherwise return 0.
|
|
*/
|
|
u16 pci_find_vsec_capability(struct pci_dev *dev, u16 vendor, int cap)
|
|
{
|
|
u16 vsec = 0;
|
|
u32 header;
|
|
|
|
if (vendor != dev->vendor)
|
|
return 0;
|
|
|
|
while ((vsec = pci_find_next_ext_capability(dev, vsec,
|
|
PCI_EXT_CAP_ID_VNDR))) {
|
|
if (pci_read_config_dword(dev, vsec + PCI_VNDR_HEADER,
|
|
&header) == PCIBIOS_SUCCESSFUL &&
|
|
PCI_VNDR_HEADER_ID(header) == cap)
|
|
return vsec;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_find_vsec_capability);
|
|
|
|
/**
|
|
* pci_find_dvsec_capability - Find DVSEC for vendor
|
|
* @dev: PCI device to query
|
|
* @vendor: Vendor ID to match for the DVSEC
|
|
* @dvsec: Designated Vendor-specific capability ID
|
|
*
|
|
* If DVSEC has Vendor ID @vendor and DVSEC ID @dvsec return the capability
|
|
* offset in config space; otherwise return 0.
|
|
*/
|
|
u16 pci_find_dvsec_capability(struct pci_dev *dev, u16 vendor, u16 dvsec)
|
|
{
|
|
int pos;
|
|
|
|
pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_DVSEC);
|
|
if (!pos)
|
|
return 0;
|
|
|
|
while (pos) {
|
|
u16 v, id;
|
|
|
|
pci_read_config_word(dev, pos + PCI_DVSEC_HEADER1, &v);
|
|
pci_read_config_word(dev, pos + PCI_DVSEC_HEADER2, &id);
|
|
if (vendor == v && dvsec == id)
|
|
return pos;
|
|
|
|
pos = pci_find_next_ext_capability(dev, pos, PCI_EXT_CAP_ID_DVSEC);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_find_dvsec_capability);
|
|
|
|
/**
|
|
* pci_find_parent_resource - return resource region of parent bus of given
|
|
* region
|
|
* @dev: PCI device structure contains resources to be searched
|
|
* @res: child resource record for which parent is sought
|
|
*
|
|
* For given resource region of given device, return the resource region of
|
|
* parent bus the given region is contained in.
|
|
*/
|
|
struct resource *pci_find_parent_resource(const struct pci_dev *dev,
|
|
struct resource *res)
|
|
{
|
|
const struct pci_bus *bus = dev->bus;
|
|
struct resource *r;
|
|
int i;
|
|
|
|
pci_bus_for_each_resource(bus, r, i) {
|
|
if (!r)
|
|
continue;
|
|
if (resource_contains(r, res)) {
|
|
|
|
/*
|
|
* If the window is prefetchable but the BAR is
|
|
* not, the allocator made a mistake.
|
|
*/
|
|
if (r->flags & IORESOURCE_PREFETCH &&
|
|
!(res->flags & IORESOURCE_PREFETCH))
|
|
return NULL;
|
|
|
|
/*
|
|
* If we're below a transparent bridge, there may
|
|
* be both a positively-decoded aperture and a
|
|
* subtractively-decoded region that contain the BAR.
|
|
* We want the positively-decoded one, so this depends
|
|
* on pci_bus_for_each_resource() giving us those
|
|
* first.
|
|
*/
|
|
return r;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(pci_find_parent_resource);
|
|
|
|
/**
|
|
* pci_find_resource - Return matching PCI device resource
|
|
* @dev: PCI device to query
|
|
* @res: Resource to look for
|
|
*
|
|
* Goes over standard PCI resources (BARs) and checks if the given resource
|
|
* is partially or fully contained in any of them. In that case the
|
|
* matching resource is returned, %NULL otherwise.
|
|
*/
|
|
struct resource *pci_find_resource(struct pci_dev *dev, struct resource *res)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < PCI_STD_NUM_BARS; i++) {
|
|
struct resource *r = &dev->resource[i];
|
|
|
|
if (r->start && resource_contains(r, res))
|
|
return r;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(pci_find_resource);
|
|
|
|
/**
|
|
* pci_wait_for_pending - wait for @mask bit(s) to clear in status word @pos
|
|
* @dev: the PCI device to operate on
|
|
* @pos: config space offset of status word
|
|
* @mask: mask of bit(s) to care about in status word
|
|
*
|
|
* Return 1 when mask bit(s) in status word clear, 0 otherwise.
|
|
*/
|
|
int pci_wait_for_pending(struct pci_dev *dev, int pos, u16 mask)
|
|
{
|
|
int i;
|
|
|
|
/* Wait for Transaction Pending bit clean */
|
|
for (i = 0; i < 4; i++) {
|
|
u16 status;
|
|
if (i)
|
|
msleep((1 << (i - 1)) * 100);
|
|
|
|
pci_read_config_word(dev, pos, &status);
|
|
if (!(status & mask))
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pci_acs_enable;
|
|
|
|
/**
|
|
* pci_request_acs - ask for ACS to be enabled if supported
|
|
*/
|
|
void pci_request_acs(void)
|
|
{
|
|
pci_acs_enable = 1;
|
|
}
|
|
|
|
static const char *disable_acs_redir_param;
|
|
|
|
/**
|
|
* pci_disable_acs_redir - disable ACS redirect capabilities
|
|
* @dev: the PCI device
|
|
*
|
|
* For only devices specified in the disable_acs_redir parameter.
|
|
*/
|
|
static void pci_disable_acs_redir(struct pci_dev *dev)
|
|
{
|
|
int ret = 0;
|
|
const char *p;
|
|
int pos;
|
|
u16 ctrl;
|
|
|
|
if (!disable_acs_redir_param)
|
|
return;
|
|
|
|
p = disable_acs_redir_param;
|
|
while (*p) {
|
|
ret = pci_dev_str_match(dev, p, &p);
|
|
if (ret < 0) {
|
|
pr_info_once("PCI: Can't parse disable_acs_redir parameter: %s\n",
|
|
disable_acs_redir_param);
|
|
|
|
break;
|
|
} else if (ret == 1) {
|
|
/* Found a match */
|
|
break;
|
|
}
|
|
|
|
if (*p != ';' && *p != ',') {
|
|
/* End of param or invalid format */
|
|
break;
|
|
}
|
|
p++;
|
|
}
|
|
|
|
if (ret != 1)
|
|
return;
|
|
|
|
if (!pci_dev_specific_disable_acs_redir(dev))
|
|
return;
|
|
|
|
pos = dev->acs_cap;
|
|
if (!pos) {
|
|
pci_warn(dev, "cannot disable ACS redirect for this hardware as it does not have ACS capabilities\n");
|
|
return;
|
|
}
|
|
|
|
pci_read_config_word(dev, pos + PCI_ACS_CTRL, &ctrl);
|
|
|
|
/* P2P Request & Completion Redirect */
|
|
ctrl &= ~(PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_EC);
|
|
|
|
pci_write_config_word(dev, pos + PCI_ACS_CTRL, ctrl);
|
|
|
|
pci_info(dev, "disabled ACS redirect\n");
|
|
}
|
|
|
|
/**
|
|
* pci_std_enable_acs - enable ACS on devices using standard ACS capabilities
|
|
* @dev: the PCI device
|
|
*/
|
|
static void pci_std_enable_acs(struct pci_dev *dev)
|
|
{
|
|
int pos;
|
|
u16 cap;
|
|
u16 ctrl;
|
|
|
|
pos = dev->acs_cap;
|
|
if (!pos)
|
|
return;
|
|
|
|
pci_read_config_word(dev, pos + PCI_ACS_CAP, &cap);
|
|
pci_read_config_word(dev, pos + PCI_ACS_CTRL, &ctrl);
|
|
|
|
/* Source Validation */
|
|
ctrl |= (cap & PCI_ACS_SV);
|
|
|
|
/* P2P Request Redirect */
|
|
ctrl |= (cap & PCI_ACS_RR);
|
|
|
|
/* P2P Completion Redirect */
|
|
ctrl |= (cap & PCI_ACS_CR);
|
|
|
|
/* Upstream Forwarding */
|
|
ctrl |= (cap & PCI_ACS_UF);
|
|
|
|
/* Enable Translation Blocking for external devices and noats */
|
|
if (pci_ats_disabled() || dev->external_facing || dev->untrusted)
|
|
ctrl |= (cap & PCI_ACS_TB);
|
|
|
|
pci_write_config_word(dev, pos + PCI_ACS_CTRL, ctrl);
|
|
}
|
|
|
|
/**
|
|
* pci_enable_acs - enable ACS if hardware support it
|
|
* @dev: the PCI device
|
|
*/
|
|
static void pci_enable_acs(struct pci_dev *dev)
|
|
{
|
|
if (!pci_acs_enable)
|
|
goto disable_acs_redir;
|
|
|
|
if (!pci_dev_specific_enable_acs(dev))
|
|
goto disable_acs_redir;
|
|
|
|
pci_std_enable_acs(dev);
|
|
|
|
disable_acs_redir:
|
|
/*
|
|
* Note: pci_disable_acs_redir() must be called even if ACS was not
|
|
* enabled by the kernel because it may have been enabled by
|
|
* platform firmware. So if we are told to disable it, we should
|
|
* always disable it after setting the kernel's default
|
|
* preferences.
|
|
*/
|
|
pci_disable_acs_redir(dev);
|
|
}
|
|
|
|
/**
|
|
* pci_restore_bars - restore a device's BAR values (e.g. after wake-up)
|
|
* @dev: PCI device to have its BARs restored
|
|
*
|
|
* Restore the BAR values for a given device, so as to make it
|
|
* accessible by its driver.
|
|
*/
|
|
static void pci_restore_bars(struct pci_dev *dev)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < PCI_BRIDGE_RESOURCES; i++)
|
|
pci_update_resource(dev, i);
|
|
}
|
|
|
|
static inline bool platform_pci_power_manageable(struct pci_dev *dev)
|
|
{
|
|
if (pci_use_mid_pm())
|
|
return true;
|
|
|
|
return acpi_pci_power_manageable(dev);
|
|
}
|
|
|
|
static inline int platform_pci_set_power_state(struct pci_dev *dev,
|
|
pci_power_t t)
|
|
{
|
|
if (pci_use_mid_pm())
|
|
return mid_pci_set_power_state(dev, t);
|
|
|
|
return acpi_pci_set_power_state(dev, t);
|
|
}
|
|
|
|
static inline pci_power_t platform_pci_get_power_state(struct pci_dev *dev)
|
|
{
|
|
if (pci_use_mid_pm())
|
|
return mid_pci_get_power_state(dev);
|
|
|
|
return acpi_pci_get_power_state(dev);
|
|
}
|
|
|
|
static inline void platform_pci_refresh_power_state(struct pci_dev *dev)
|
|
{
|
|
if (!pci_use_mid_pm())
|
|
acpi_pci_refresh_power_state(dev);
|
|
}
|
|
|
|
static inline pci_power_t platform_pci_choose_state(struct pci_dev *dev)
|
|
{
|
|
if (pci_use_mid_pm())
|
|
return PCI_POWER_ERROR;
|
|
|
|
return acpi_pci_choose_state(dev);
|
|
}
|
|
|
|
static inline int platform_pci_set_wakeup(struct pci_dev *dev, bool enable)
|
|
{
|
|
if (pci_use_mid_pm())
|
|
return PCI_POWER_ERROR;
|
|
|
|
return acpi_pci_wakeup(dev, enable);
|
|
}
|
|
|
|
static inline bool platform_pci_need_resume(struct pci_dev *dev)
|
|
{
|
|
if (pci_use_mid_pm())
|
|
return false;
|
|
|
|
return acpi_pci_need_resume(dev);
|
|
}
|
|
|
|
static inline bool platform_pci_bridge_d3(struct pci_dev *dev)
|
|
{
|
|
if (pci_use_mid_pm())
|
|
return false;
|
|
|
|
return acpi_pci_bridge_d3(dev);
|
|
}
|
|
|
|
/**
|
|
* pci_update_current_state - Read power state of given device and cache it
|
|
* @dev: PCI device to handle.
|
|
* @state: State to cache in case the device doesn't have the PM capability
|
|
*
|
|
* The power state is read from the PMCSR register, which however is
|
|
* inaccessible in D3cold. The platform firmware is therefore queried first
|
|
* to detect accessibility of the register. In case the platform firmware
|
|
* reports an incorrect state or the device isn't power manageable by the
|
|
* platform at all, we try to detect D3cold by testing accessibility of the
|
|
* vendor ID in config space.
|
|
*/
|
|
void pci_update_current_state(struct pci_dev *dev, pci_power_t state)
|
|
{
|
|
if (platform_pci_get_power_state(dev) == PCI_D3cold) {
|
|
dev->current_state = PCI_D3cold;
|
|
} else if (dev->pm_cap) {
|
|
u16 pmcsr;
|
|
|
|
pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
|
|
if (PCI_POSSIBLE_ERROR(pmcsr)) {
|
|
dev->current_state = PCI_D3cold;
|
|
return;
|
|
}
|
|
dev->current_state = pmcsr & PCI_PM_CTRL_STATE_MASK;
|
|
} else {
|
|
dev->current_state = state;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* pci_refresh_power_state - Refresh the given device's power state data
|
|
* @dev: Target PCI device.
|
|
*
|
|
* Ask the platform to refresh the devices power state information and invoke
|
|
* pci_update_current_state() to update its current PCI power state.
|
|
*/
|
|
void pci_refresh_power_state(struct pci_dev *dev)
|
|
{
|
|
platform_pci_refresh_power_state(dev);
|
|
pci_update_current_state(dev, dev->current_state);
|
|
}
|
|
|
|
/**
|
|
* pci_platform_power_transition - Use platform to change device power state
|
|
* @dev: PCI device to handle.
|
|
* @state: State to put the device into.
|
|
*/
|
|
int pci_platform_power_transition(struct pci_dev *dev, pci_power_t state)
|
|
{
|
|
int error;
|
|
|
|
error = platform_pci_set_power_state(dev, state);
|
|
if (!error)
|
|
pci_update_current_state(dev, state);
|
|
else if (!dev->pm_cap) /* Fall back to PCI_D0 */
|
|
dev->current_state = PCI_D0;
|
|
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_platform_power_transition);
|
|
|
|
static int pci_resume_one(struct pci_dev *pci_dev, void *ign)
|
|
{
|
|
pm_request_resume(&pci_dev->dev);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pci_resume_bus - Walk given bus and runtime resume devices on it
|
|
* @bus: Top bus of the subtree to walk.
|
|
*/
|
|
void pci_resume_bus(struct pci_bus *bus)
|
|
{
|
|
if (bus)
|
|
pci_walk_bus(bus, pci_resume_one, NULL);
|
|
}
|
|
|
|
static int pci_dev_wait(struct pci_dev *dev, char *reset_type, int timeout)
|
|
{
|
|
int delay = 1;
|
|
u32 id;
|
|
|
|
/*
|
|
* After reset, the device should not silently discard config
|
|
* requests, but it may still indicate that it needs more time by
|
|
* responding to them with CRS completions. The Root Port will
|
|
* generally synthesize ~0 (PCI_ERROR_RESPONSE) data to complete
|
|
* the read (except when CRS SV is enabled and the read was for the
|
|
* Vendor ID; in that case it synthesizes 0x0001 data).
|
|
*
|
|
* Wait for the device to return a non-CRS completion. Read the
|
|
* Command register instead of Vendor ID so we don't have to
|
|
* contend with the CRS SV value.
|
|
*/
|
|
pci_read_config_dword(dev, PCI_COMMAND, &id);
|
|
while (PCI_POSSIBLE_ERROR(id)) {
|
|
if (delay > timeout) {
|
|
pci_warn(dev, "not ready %dms after %s; giving up\n",
|
|
delay - 1, reset_type);
|
|
return -ENOTTY;
|
|
}
|
|
|
|
if (delay > 1000)
|
|
pci_info(dev, "not ready %dms after %s; waiting\n",
|
|
delay - 1, reset_type);
|
|
|
|
msleep(delay);
|
|
delay *= 2;
|
|
pci_read_config_dword(dev, PCI_COMMAND, &id);
|
|
}
|
|
|
|
if (delay > 1000)
|
|
pci_info(dev, "ready %dms after %s\n", delay - 1,
|
|
reset_type);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pci_power_up - Put the given device into D0
|
|
* @dev: PCI device to power up
|
|
*
|
|
* On success, return 0 or 1, depending on whether or not it is necessary to
|
|
* restore the device's BARs subsequently (1 is returned in that case).
|
|
*/
|
|
int pci_power_up(struct pci_dev *dev)
|
|
{
|
|
bool need_restore;
|
|
pci_power_t state;
|
|
u16 pmcsr;
|
|
|
|
platform_pci_set_power_state(dev, PCI_D0);
|
|
|
|
if (!dev->pm_cap) {
|
|
state = platform_pci_get_power_state(dev);
|
|
if (state == PCI_UNKNOWN)
|
|
dev->current_state = PCI_D0;
|
|
else
|
|
dev->current_state = state;
|
|
|
|
if (state == PCI_D0)
|
|
return 0;
|
|
|
|
return -EIO;
|
|
}
|
|
|
|
pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
|
|
if (PCI_POSSIBLE_ERROR(pmcsr)) {
|
|
pci_err(dev, "Unable to change power state from %s to D0, device inaccessible\n",
|
|
pci_power_name(dev->current_state));
|
|
dev->current_state = PCI_D3cold;
|
|
return -EIO;
|
|
}
|
|
|
|
state = pmcsr & PCI_PM_CTRL_STATE_MASK;
|
|
|
|
need_restore = (state == PCI_D3hot || dev->current_state >= PCI_D3hot) &&
|
|
!(pmcsr & PCI_PM_CTRL_NO_SOFT_RESET);
|
|
|
|
if (state == PCI_D0)
|
|
goto end;
|
|
|
|
/*
|
|
* Force the entire word to 0. This doesn't affect PME_Status, disables
|
|
* PME_En, and sets PowerState to 0.
|
|
*/
|
|
pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, 0);
|
|
|
|
/* Mandatory transition delays; see PCI PM 1.2. */
|
|
if (state == PCI_D3hot)
|
|
pci_dev_d3_sleep(dev);
|
|
else if (state == PCI_D2)
|
|
udelay(PCI_PM_D2_DELAY);
|
|
|
|
end:
|
|
dev->current_state = PCI_D0;
|
|
if (need_restore)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pci_set_full_power_state - Put a PCI device into D0 and update its state
|
|
* @dev: PCI device to power up
|
|
*
|
|
* Call pci_power_up() to put @dev into D0, read from its PCI_PM_CTRL register
|
|
* to confirm the state change, restore its BARs if they might be lost and
|
|
* reconfigure ASPM in acordance with the new power state.
|
|
*
|
|
* If pci_restore_state() is going to be called right after a power state change
|
|
* to D0, it is more efficient to use pci_power_up() directly instead of this
|
|
* function.
|
|
*/
|
|
static int pci_set_full_power_state(struct pci_dev *dev)
|
|
{
|
|
u16 pmcsr;
|
|
int ret;
|
|
|
|
ret = pci_power_up(dev);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
|
|
dev->current_state = pmcsr & PCI_PM_CTRL_STATE_MASK;
|
|
if (dev->current_state != PCI_D0) {
|
|
pci_info_ratelimited(dev, "Refused to change power state from %s to D0\n",
|
|
pci_power_name(dev->current_state));
|
|
} else if (ret > 0) {
|
|
/*
|
|
* According to section 5.4.1 of the "PCI BUS POWER MANAGEMENT
|
|
* INTERFACE SPECIFICATION, REV. 1.2", a device transitioning
|
|
* from D3hot to D0 _may_ perform an internal reset, thereby
|
|
* going to "D0 Uninitialized" rather than "D0 Initialized".
|
|
* For example, at least some versions of the 3c905B and the
|
|
* 3c556B exhibit this behaviour.
|
|
*
|
|
* At least some laptop BIOSen (e.g. the Thinkpad T21) leave
|
|
* devices in a D3hot state at boot. Consequently, we need to
|
|
* restore at least the BARs so that the device will be
|
|
* accessible to its driver.
|
|
*/
|
|
pci_restore_bars(dev);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* __pci_dev_set_current_state - Set current state of a PCI device
|
|
* @dev: Device to handle
|
|
* @data: pointer to state to be set
|
|
*/
|
|
static int __pci_dev_set_current_state(struct pci_dev *dev, void *data)
|
|
{
|
|
pci_power_t state = *(pci_power_t *)data;
|
|
|
|
dev->current_state = state;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pci_bus_set_current_state - Walk given bus and set current state of devices
|
|
* @bus: Top bus of the subtree to walk.
|
|
* @state: state to be set
|
|
*/
|
|
void pci_bus_set_current_state(struct pci_bus *bus, pci_power_t state)
|
|
{
|
|
if (bus)
|
|
pci_walk_bus(bus, __pci_dev_set_current_state, &state);
|
|
}
|
|
|
|
/**
|
|
* pci_set_low_power_state - Put a PCI device into a low-power state.
|
|
* @dev: PCI device to handle.
|
|
* @state: PCI power state (D1, D2, D3hot) to put the device into.
|
|
*
|
|
* Use the device's PCI_PM_CTRL register to put it into a low-power state.
|
|
*
|
|
* RETURN VALUE:
|
|
* -EINVAL if the requested state is invalid.
|
|
* -EIO if device does not support PCI PM or its PM capabilities register has a
|
|
* wrong version, or device doesn't support the requested state.
|
|
* 0 if device already is in the requested state.
|
|
* 0 if device's power state has been successfully changed.
|
|
*/
|
|
static int pci_set_low_power_state(struct pci_dev *dev, pci_power_t state)
|
|
{
|
|
u16 pmcsr;
|
|
|
|
if (!dev->pm_cap)
|
|
return -EIO;
|
|
|
|
/*
|
|
* Validate transition: We can enter D0 from any state, but if
|
|
* we're already in a low-power state, we can only go deeper. E.g.,
|
|
* we can go from D1 to D3, but we can't go directly from D3 to D1;
|
|
* we'd have to go from D3 to D0, then to D1.
|
|
*/
|
|
if (dev->current_state <= PCI_D3cold && dev->current_state > state) {
|
|
pci_dbg(dev, "Invalid power transition (from %s to %s)\n",
|
|
pci_power_name(dev->current_state),
|
|
pci_power_name(state));
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Check if this device supports the desired state */
|
|
if ((state == PCI_D1 && !dev->d1_support)
|
|
|| (state == PCI_D2 && !dev->d2_support))
|
|
return -EIO;
|
|
|
|
pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
|
|
if (PCI_POSSIBLE_ERROR(pmcsr)) {
|
|
pci_err(dev, "Unable to change power state from %s to %s, device inaccessible\n",
|
|
pci_power_name(dev->current_state),
|
|
pci_power_name(state));
|
|
dev->current_state = PCI_D3cold;
|
|
return -EIO;
|
|
}
|
|
|
|
pmcsr &= ~PCI_PM_CTRL_STATE_MASK;
|
|
pmcsr |= state;
|
|
|
|
/* Enter specified state */
|
|
pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, pmcsr);
|
|
|
|
/* Mandatory power management transition delays; see PCI PM 1.2. */
|
|
if (state == PCI_D3hot)
|
|
pci_dev_d3_sleep(dev);
|
|
else if (state == PCI_D2)
|
|
udelay(PCI_PM_D2_DELAY);
|
|
|
|
pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
|
|
dev->current_state = pmcsr & PCI_PM_CTRL_STATE_MASK;
|
|
if (dev->current_state != state)
|
|
pci_info_ratelimited(dev, "Refused to change power state from %s to %s\n",
|
|
pci_power_name(dev->current_state),
|
|
pci_power_name(state));
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pci_set_power_state - Set the power state of a PCI device
|
|
* @dev: PCI device to handle.
|
|
* @state: PCI power state (D0, D1, D2, D3hot) to put the device into.
|
|
*
|
|
* Transition a device to a new power state, using the platform firmware and/or
|
|
* the device's PCI PM registers.
|
|
*
|
|
* RETURN VALUE:
|
|
* -EINVAL if the requested state is invalid.
|
|
* -EIO if device does not support PCI PM or its PM capabilities register has a
|
|
* wrong version, or device doesn't support the requested state.
|
|
* 0 if the transition is to D1 or D2 but D1 and D2 are not supported.
|
|
* 0 if device already is in the requested state.
|
|
* 0 if the transition is to D3 but D3 is not supported.
|
|
* 0 if device's power state has been successfully changed.
|
|
*/
|
|
int pci_set_power_state(struct pci_dev *dev, pci_power_t state)
|
|
{
|
|
int error;
|
|
|
|
/* Bound the state we're entering */
|
|
if (state > PCI_D3cold)
|
|
state = PCI_D3cold;
|
|
else if (state < PCI_D0)
|
|
state = PCI_D0;
|
|
else if ((state == PCI_D1 || state == PCI_D2) && pci_no_d1d2(dev))
|
|
|
|
/*
|
|
* If the device or the parent bridge do not support PCI
|
|
* PM, ignore the request if we're doing anything other
|
|
* than putting it into D0 (which would only happen on
|
|
* boot).
|
|
*/
|
|
return 0;
|
|
|
|
/* Check if we're already there */
|
|
if (dev->current_state == state)
|
|
return 0;
|
|
|
|
if (state == PCI_D0)
|
|
return pci_set_full_power_state(dev);
|
|
|
|
/*
|
|
* This device is quirked not to be put into D3, so don't put it in
|
|
* D3
|
|
*/
|
|
if (state >= PCI_D3hot && (dev->dev_flags & PCI_DEV_FLAGS_NO_D3))
|
|
return 0;
|
|
|
|
if (state == PCI_D3cold) {
|
|
/*
|
|
* To put the device in D3cold, put it into D3hot in the native
|
|
* way, then put it into D3cold using platform ops.
|
|
*/
|
|
error = pci_set_low_power_state(dev, PCI_D3hot);
|
|
|
|
if (pci_platform_power_transition(dev, PCI_D3cold))
|
|
return error;
|
|
|
|
/* Powering off a bridge may power off the whole hierarchy */
|
|
if (dev->current_state == PCI_D3cold)
|
|
pci_bus_set_current_state(dev->subordinate, PCI_D3cold);
|
|
} else {
|
|
error = pci_set_low_power_state(dev, state);
|
|
|
|
if (pci_platform_power_transition(dev, state))
|
|
return error;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(pci_set_power_state);
|
|
|
|
#define PCI_EXP_SAVE_REGS 7
|
|
|
|
static struct pci_cap_saved_state *_pci_find_saved_cap(struct pci_dev *pci_dev,
|
|
u16 cap, bool extended)
|
|
{
|
|
struct pci_cap_saved_state *tmp;
|
|
|
|
hlist_for_each_entry(tmp, &pci_dev->saved_cap_space, next) {
|
|
if (tmp->cap.cap_extended == extended && tmp->cap.cap_nr == cap)
|
|
return tmp;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
struct pci_cap_saved_state *pci_find_saved_cap(struct pci_dev *dev, char cap)
|
|
{
|
|
return _pci_find_saved_cap(dev, cap, false);
|
|
}
|
|
|
|
struct pci_cap_saved_state *pci_find_saved_ext_cap(struct pci_dev *dev, u16 cap)
|
|
{
|
|
return _pci_find_saved_cap(dev, cap, true);
|
|
}
|
|
|
|
static int pci_save_pcie_state(struct pci_dev *dev)
|
|
{
|
|
int i = 0;
|
|
struct pci_cap_saved_state *save_state;
|
|
u16 *cap;
|
|
|
|
if (!pci_is_pcie(dev))
|
|
return 0;
|
|
|
|
save_state = pci_find_saved_cap(dev, PCI_CAP_ID_EXP);
|
|
if (!save_state) {
|
|
pci_err(dev, "buffer not found in %s\n", __func__);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
cap = (u16 *)&save_state->cap.data[0];
|
|
pcie_capability_read_word(dev, PCI_EXP_DEVCTL, &cap[i++]);
|
|
pcie_capability_read_word(dev, PCI_EXP_LNKCTL, &cap[i++]);
|
|
pcie_capability_read_word(dev, PCI_EXP_SLTCTL, &cap[i++]);
|
|
pcie_capability_read_word(dev, PCI_EXP_RTCTL, &cap[i++]);
|
|
pcie_capability_read_word(dev, PCI_EXP_DEVCTL2, &cap[i++]);
|
|
pcie_capability_read_word(dev, PCI_EXP_LNKCTL2, &cap[i++]);
|
|
pcie_capability_read_word(dev, PCI_EXP_SLTCTL2, &cap[i++]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void pci_bridge_reconfigure_ltr(struct pci_dev *dev)
|
|
{
|
|
#ifdef CONFIG_PCIEASPM
|
|
struct pci_dev *bridge;
|
|
u32 ctl;
|
|
|
|
bridge = pci_upstream_bridge(dev);
|
|
if (bridge && bridge->ltr_path) {
|
|
pcie_capability_read_dword(bridge, PCI_EXP_DEVCTL2, &ctl);
|
|
if (!(ctl & PCI_EXP_DEVCTL2_LTR_EN)) {
|
|
pci_dbg(bridge, "re-enabling LTR\n");
|
|
pcie_capability_set_word(bridge, PCI_EXP_DEVCTL2,
|
|
PCI_EXP_DEVCTL2_LTR_EN);
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static void pci_restore_pcie_state(struct pci_dev *dev)
|
|
{
|
|
int i = 0;
|
|
struct pci_cap_saved_state *save_state;
|
|
u16 *cap;
|
|
|
|
save_state = pci_find_saved_cap(dev, PCI_CAP_ID_EXP);
|
|
if (!save_state)
|
|
return;
|
|
|
|
/*
|
|
* Downstream ports reset the LTR enable bit when link goes down.
|
|
* Check and re-configure the bit here before restoring device.
|
|
* PCIe r5.0, sec 7.5.3.16.
|
|
*/
|
|
pci_bridge_reconfigure_ltr(dev);
|
|
|
|
cap = (u16 *)&save_state->cap.data[0];
|
|
pcie_capability_write_word(dev, PCI_EXP_DEVCTL, cap[i++]);
|
|
pcie_capability_write_word(dev, PCI_EXP_LNKCTL, cap[i++]);
|
|
pcie_capability_write_word(dev, PCI_EXP_SLTCTL, cap[i++]);
|
|
pcie_capability_write_word(dev, PCI_EXP_RTCTL, cap[i++]);
|
|
pcie_capability_write_word(dev, PCI_EXP_DEVCTL2, cap[i++]);
|
|
pcie_capability_write_word(dev, PCI_EXP_LNKCTL2, cap[i++]);
|
|
pcie_capability_write_word(dev, PCI_EXP_SLTCTL2, cap[i++]);
|
|
}
|
|
|
|
static int pci_save_pcix_state(struct pci_dev *dev)
|
|
{
|
|
int pos;
|
|
struct pci_cap_saved_state *save_state;
|
|
|
|
pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
|
|
if (!pos)
|
|
return 0;
|
|
|
|
save_state = pci_find_saved_cap(dev, PCI_CAP_ID_PCIX);
|
|
if (!save_state) {
|
|
pci_err(dev, "buffer not found in %s\n", __func__);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
pci_read_config_word(dev, pos + PCI_X_CMD,
|
|
(u16 *)save_state->cap.data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void pci_restore_pcix_state(struct pci_dev *dev)
|
|
{
|
|
int i = 0, pos;
|
|
struct pci_cap_saved_state *save_state;
|
|
u16 *cap;
|
|
|
|
save_state = pci_find_saved_cap(dev, PCI_CAP_ID_PCIX);
|
|
pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
|
|
if (!save_state || !pos)
|
|
return;
|
|
cap = (u16 *)&save_state->cap.data[0];
|
|
|
|
pci_write_config_word(dev, pos + PCI_X_CMD, cap[i++]);
|
|
}
|
|
|
|
static void pci_save_ltr_state(struct pci_dev *dev)
|
|
{
|
|
int ltr;
|
|
struct pci_cap_saved_state *save_state;
|
|
u32 *cap;
|
|
|
|
if (!pci_is_pcie(dev))
|
|
return;
|
|
|
|
ltr = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_LTR);
|
|
if (!ltr)
|
|
return;
|
|
|
|
save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_LTR);
|
|
if (!save_state) {
|
|
pci_err(dev, "no suspend buffer for LTR; ASPM issues possible after resume\n");
|
|
return;
|
|
}
|
|
|
|
/* Some broken devices only support dword access to LTR */
|
|
cap = &save_state->cap.data[0];
|
|
pci_read_config_dword(dev, ltr + PCI_LTR_MAX_SNOOP_LAT, cap);
|
|
}
|
|
|
|
static void pci_restore_ltr_state(struct pci_dev *dev)
|
|
{
|
|
struct pci_cap_saved_state *save_state;
|
|
int ltr;
|
|
u32 *cap;
|
|
|
|
save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_LTR);
|
|
ltr = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_LTR);
|
|
if (!save_state || !ltr)
|
|
return;
|
|
|
|
/* Some broken devices only support dword access to LTR */
|
|
cap = &save_state->cap.data[0];
|
|
pci_write_config_dword(dev, ltr + PCI_LTR_MAX_SNOOP_LAT, *cap);
|
|
}
|
|
|
|
/**
|
|
* pci_save_state - save the PCI configuration space of a device before
|
|
* suspending
|
|
* @dev: PCI device that we're dealing with
|
|
*/
|
|
int pci_save_state(struct pci_dev *dev)
|
|
{
|
|
int i;
|
|
/* XXX: 100% dword access ok here? */
|
|
for (i = 0; i < 16; i++) {
|
|
pci_read_config_dword(dev, i * 4, &dev->saved_config_space[i]);
|
|
pci_dbg(dev, "saving config space at offset %#x (reading %#x)\n",
|
|
i * 4, dev->saved_config_space[i]);
|
|
}
|
|
dev->state_saved = true;
|
|
|
|
i = pci_save_pcie_state(dev);
|
|
if (i != 0)
|
|
return i;
|
|
|
|
i = pci_save_pcix_state(dev);
|
|
if (i != 0)
|
|
return i;
|
|
|
|
pci_save_ltr_state(dev);
|
|
pci_save_aspm_l1ss_state(dev);
|
|
pci_save_dpc_state(dev);
|
|
pci_save_aer_state(dev);
|
|
pci_save_ptm_state(dev);
|
|
return pci_save_vc_state(dev);
|
|
}
|
|
EXPORT_SYMBOL(pci_save_state);
|
|
|
|
static void pci_restore_config_dword(struct pci_dev *pdev, int offset,
|
|
u32 saved_val, int retry, bool force)
|
|
{
|
|
u32 val;
|
|
|
|
pci_read_config_dword(pdev, offset, &val);
|
|
if (!force && val == saved_val)
|
|
return;
|
|
|
|
for (;;) {
|
|
pci_dbg(pdev, "restoring config space at offset %#x (was %#x, writing %#x)\n",
|
|
offset, val, saved_val);
|
|
pci_write_config_dword(pdev, offset, saved_val);
|
|
if (retry-- <= 0)
|
|
return;
|
|
|
|
pci_read_config_dword(pdev, offset, &val);
|
|
if (val == saved_val)
|
|
return;
|
|
|
|
mdelay(1);
|
|
}
|
|
}
|
|
|
|
static void pci_restore_config_space_range(struct pci_dev *pdev,
|
|
int start, int end, int retry,
|
|
bool force)
|
|
{
|
|
int index;
|
|
|
|
for (index = end; index >= start; index--)
|
|
pci_restore_config_dword(pdev, 4 * index,
|
|
pdev->saved_config_space[index],
|
|
retry, force);
|
|
}
|
|
|
|
static void pci_restore_config_space(struct pci_dev *pdev)
|
|
{
|
|
if (pdev->hdr_type == PCI_HEADER_TYPE_NORMAL) {
|
|
pci_restore_config_space_range(pdev, 10, 15, 0, false);
|
|
/* Restore BARs before the command register. */
|
|
pci_restore_config_space_range(pdev, 4, 9, 10, false);
|
|
pci_restore_config_space_range(pdev, 0, 3, 0, false);
|
|
} else if (pdev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
|
|
pci_restore_config_space_range(pdev, 12, 15, 0, false);
|
|
|
|
/*
|
|
* Force rewriting of prefetch registers to avoid S3 resume
|
|
* issues on Intel PCI bridges that occur when these
|
|
* registers are not explicitly written.
|
|
*/
|
|
pci_restore_config_space_range(pdev, 9, 11, 0, true);
|
|
pci_restore_config_space_range(pdev, 0, 8, 0, false);
|
|
} else {
|
|
pci_restore_config_space_range(pdev, 0, 15, 0, false);
|
|
}
|
|
}
|
|
|
|
static void pci_restore_rebar_state(struct pci_dev *pdev)
|
|
{
|
|
unsigned int pos, nbars, i;
|
|
u32 ctrl;
|
|
|
|
pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_REBAR);
|
|
if (!pos)
|
|
return;
|
|
|
|
pci_read_config_dword(pdev, pos + PCI_REBAR_CTRL, &ctrl);
|
|
nbars = (ctrl & PCI_REBAR_CTRL_NBAR_MASK) >>
|
|
PCI_REBAR_CTRL_NBAR_SHIFT;
|
|
|
|
for (i = 0; i < nbars; i++, pos += 8) {
|
|
struct resource *res;
|
|
int bar_idx, size;
|
|
|
|
pci_read_config_dword(pdev, pos + PCI_REBAR_CTRL, &ctrl);
|
|
bar_idx = ctrl & PCI_REBAR_CTRL_BAR_IDX;
|
|
res = pdev->resource + bar_idx;
|
|
size = pci_rebar_bytes_to_size(resource_size(res));
|
|
ctrl &= ~PCI_REBAR_CTRL_BAR_SIZE;
|
|
ctrl |= size << PCI_REBAR_CTRL_BAR_SHIFT;
|
|
pci_write_config_dword(pdev, pos + PCI_REBAR_CTRL, ctrl);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* pci_restore_state - Restore the saved state of a PCI device
|
|
* @dev: PCI device that we're dealing with
|
|
*/
|
|
void pci_restore_state(struct pci_dev *dev)
|
|
{
|
|
if (!dev->state_saved)
|
|
return;
|
|
|
|
/*
|
|
* Restore max latencies (in the LTR capability) before enabling
|
|
* LTR itself (in the PCIe capability).
|
|
*/
|
|
pci_restore_ltr_state(dev);
|
|
pci_restore_aspm_l1ss_state(dev);
|
|
|
|
pci_restore_pcie_state(dev);
|
|
pci_restore_pasid_state(dev);
|
|
pci_restore_pri_state(dev);
|
|
pci_restore_ats_state(dev);
|
|
pci_restore_vc_state(dev);
|
|
pci_restore_rebar_state(dev);
|
|
pci_restore_dpc_state(dev);
|
|
pci_restore_ptm_state(dev);
|
|
|
|
pci_aer_clear_status(dev);
|
|
pci_restore_aer_state(dev);
|
|
|
|
pci_restore_config_space(dev);
|
|
|
|
pci_restore_pcix_state(dev);
|
|
pci_restore_msi_state(dev);
|
|
|
|
/* Restore ACS and IOV configuration state */
|
|
pci_enable_acs(dev);
|
|
pci_restore_iov_state(dev);
|
|
|
|
dev->state_saved = false;
|
|
}
|
|
EXPORT_SYMBOL(pci_restore_state);
|
|
|
|
struct pci_saved_state {
|
|
u32 config_space[16];
|
|
struct pci_cap_saved_data cap[];
|
|
};
|
|
|
|
/**
|
|
* pci_store_saved_state - Allocate and return an opaque struct containing
|
|
* the device saved state.
|
|
* @dev: PCI device that we're dealing with
|
|
*
|
|
* Return NULL if no state or error.
|
|
*/
|
|
struct pci_saved_state *pci_store_saved_state(struct pci_dev *dev)
|
|
{
|
|
struct pci_saved_state *state;
|
|
struct pci_cap_saved_state *tmp;
|
|
struct pci_cap_saved_data *cap;
|
|
size_t size;
|
|
|
|
if (!dev->state_saved)
|
|
return NULL;
|
|
|
|
size = sizeof(*state) + sizeof(struct pci_cap_saved_data);
|
|
|
|
hlist_for_each_entry(tmp, &dev->saved_cap_space, next)
|
|
size += sizeof(struct pci_cap_saved_data) + tmp->cap.size;
|
|
|
|
state = kzalloc(size, GFP_KERNEL);
|
|
if (!state)
|
|
return NULL;
|
|
|
|
memcpy(state->config_space, dev->saved_config_space,
|
|
sizeof(state->config_space));
|
|
|
|
cap = state->cap;
|
|
hlist_for_each_entry(tmp, &dev->saved_cap_space, next) {
|
|
size_t len = sizeof(struct pci_cap_saved_data) + tmp->cap.size;
|
|
memcpy(cap, &tmp->cap, len);
|
|
cap = (struct pci_cap_saved_data *)((u8 *)cap + len);
|
|
}
|
|
/* Empty cap_save terminates list */
|
|
|
|
return state;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_store_saved_state);
|
|
|
|
/**
|
|
* pci_load_saved_state - Reload the provided save state into struct pci_dev.
|
|
* @dev: PCI device that we're dealing with
|
|
* @state: Saved state returned from pci_store_saved_state()
|
|
*/
|
|
int pci_load_saved_state(struct pci_dev *dev,
|
|
struct pci_saved_state *state)
|
|
{
|
|
struct pci_cap_saved_data *cap;
|
|
|
|
dev->state_saved = false;
|
|
|
|
if (!state)
|
|
return 0;
|
|
|
|
memcpy(dev->saved_config_space, state->config_space,
|
|
sizeof(state->config_space));
|
|
|
|
cap = state->cap;
|
|
while (cap->size) {
|
|
struct pci_cap_saved_state *tmp;
|
|
|
|
tmp = _pci_find_saved_cap(dev, cap->cap_nr, cap->cap_extended);
|
|
if (!tmp || tmp->cap.size != cap->size)
|
|
return -EINVAL;
|
|
|
|
memcpy(tmp->cap.data, cap->data, tmp->cap.size);
|
|
cap = (struct pci_cap_saved_data *)((u8 *)cap +
|
|
sizeof(struct pci_cap_saved_data) + cap->size);
|
|
}
|
|
|
|
dev->state_saved = true;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_load_saved_state);
|
|
|
|
/**
|
|
* pci_load_and_free_saved_state - Reload the save state pointed to by state,
|
|
* and free the memory allocated for it.
|
|
* @dev: PCI device that we're dealing with
|
|
* @state: Pointer to saved state returned from pci_store_saved_state()
|
|
*/
|
|
int pci_load_and_free_saved_state(struct pci_dev *dev,
|
|
struct pci_saved_state **state)
|
|
{
|
|
int ret = pci_load_saved_state(dev, *state);
|
|
kfree(*state);
|
|
*state = NULL;
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_load_and_free_saved_state);
|
|
|
|
int __weak pcibios_enable_device(struct pci_dev *dev, int bars)
|
|
{
|
|
return pci_enable_resources(dev, bars);
|
|
}
|
|
|
|
static int do_pci_enable_device(struct pci_dev *dev, int bars)
|
|
{
|
|
int err;
|
|
struct pci_dev *bridge;
|
|
u16 cmd;
|
|
u8 pin;
|
|
|
|
err = pci_set_power_state(dev, PCI_D0);
|
|
if (err < 0 && err != -EIO)
|
|
return err;
|
|
|
|
bridge = pci_upstream_bridge(dev);
|
|
if (bridge)
|
|
pcie_aspm_powersave_config_link(bridge);
|
|
|
|
err = pcibios_enable_device(dev, bars);
|
|
if (err < 0)
|
|
return err;
|
|
pci_fixup_device(pci_fixup_enable, dev);
|
|
|
|
if (dev->msi_enabled || dev->msix_enabled)
|
|
return 0;
|
|
|
|
pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
|
|
if (pin) {
|
|
pci_read_config_word(dev, PCI_COMMAND, &cmd);
|
|
if (cmd & PCI_COMMAND_INTX_DISABLE)
|
|
pci_write_config_word(dev, PCI_COMMAND,
|
|
cmd & ~PCI_COMMAND_INTX_DISABLE);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pci_reenable_device - Resume abandoned device
|
|
* @dev: PCI device to be resumed
|
|
*
|
|
* NOTE: This function is a backend of pci_default_resume() and is not supposed
|
|
* to be called by normal code, write proper resume handler and use it instead.
|
|
*/
|
|
int pci_reenable_device(struct pci_dev *dev)
|
|
{
|
|
if (pci_is_enabled(dev))
|
|
return do_pci_enable_device(dev, (1 << PCI_NUM_RESOURCES) - 1);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(pci_reenable_device);
|
|
|
|
static void pci_enable_bridge(struct pci_dev *dev)
|
|
{
|
|
struct pci_dev *bridge;
|
|
int retval;
|
|
|
|
bridge = pci_upstream_bridge(dev);
|
|
if (bridge)
|
|
pci_enable_bridge(bridge);
|
|
|
|
if (pci_is_enabled(dev)) {
|
|
if (!dev->is_busmaster)
|
|
pci_set_master(dev);
|
|
return;
|
|
}
|
|
|
|
retval = pci_enable_device(dev);
|
|
if (retval)
|
|
pci_err(dev, "Error enabling bridge (%d), continuing\n",
|
|
retval);
|
|
pci_set_master(dev);
|
|
}
|
|
|
|
static int pci_enable_device_flags(struct pci_dev *dev, unsigned long flags)
|
|
{
|
|
struct pci_dev *bridge;
|
|
int err;
|
|
int i, bars = 0;
|
|
|
|
/*
|
|
* Power state could be unknown at this point, either due to a fresh
|
|
* boot or a device removal call. So get the current power state
|
|
* so that things like MSI message writing will behave as expected
|
|
* (e.g. if the device really is in D0 at enable time).
|
|
*/
|
|
pci_update_current_state(dev, dev->current_state);
|
|
|
|
if (atomic_inc_return(&dev->enable_cnt) > 1)
|
|
return 0; /* already enabled */
|
|
|
|
bridge = pci_upstream_bridge(dev);
|
|
if (bridge)
|
|
pci_enable_bridge(bridge);
|
|
|
|
/* only skip sriov related */
|
|
for (i = 0; i <= PCI_ROM_RESOURCE; i++)
|
|
if (dev->resource[i].flags & flags)
|
|
bars |= (1 << i);
|
|
for (i = PCI_BRIDGE_RESOURCES; i < DEVICE_COUNT_RESOURCE; i++)
|
|
if (dev->resource[i].flags & flags)
|
|
bars |= (1 << i);
|
|
|
|
err = do_pci_enable_device(dev, bars);
|
|
if (err < 0)
|
|
atomic_dec(&dev->enable_cnt);
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* pci_enable_device_io - Initialize a device for use with IO space
|
|
* @dev: PCI device to be initialized
|
|
*
|
|
* Initialize device before it's used by a driver. Ask low-level code
|
|
* to enable I/O resources. Wake up the device if it was suspended.
|
|
* Beware, this function can fail.
|
|
*/
|
|
int pci_enable_device_io(struct pci_dev *dev)
|
|
{
|
|
return pci_enable_device_flags(dev, IORESOURCE_IO);
|
|
}
|
|
EXPORT_SYMBOL(pci_enable_device_io);
|
|
|
|
/**
|
|
* pci_enable_device_mem - Initialize a device for use with Memory space
|
|
* @dev: PCI device to be initialized
|
|
*
|
|
* Initialize device before it's used by a driver. Ask low-level code
|
|
* to enable Memory resources. Wake up the device if it was suspended.
|
|
* Beware, this function can fail.
|
|
*/
|
|
int pci_enable_device_mem(struct pci_dev *dev)
|
|
{
|
|
return pci_enable_device_flags(dev, IORESOURCE_MEM);
|
|
}
|
|
EXPORT_SYMBOL(pci_enable_device_mem);
|
|
|
|
/**
|
|
* pci_enable_device - Initialize device before it's used by a driver.
|
|
* @dev: PCI device to be initialized
|
|
*
|
|
* Initialize device before it's used by a driver. Ask low-level code
|
|
* to enable I/O and memory. Wake up the device if it was suspended.
|
|
* Beware, this function can fail.
|
|
*
|
|
* Note we don't actually enable the device many times if we call
|
|
* this function repeatedly (we just increment the count).
|
|
*/
|
|
int pci_enable_device(struct pci_dev *dev)
|
|
{
|
|
return pci_enable_device_flags(dev, IORESOURCE_MEM | IORESOURCE_IO);
|
|
}
|
|
EXPORT_SYMBOL(pci_enable_device);
|
|
|
|
/*
|
|
* Managed PCI resources. This manages device on/off, INTx/MSI/MSI-X
|
|
* on/off and BAR regions. pci_dev itself records MSI/MSI-X status, so
|
|
* there's no need to track it separately. pci_devres is initialized
|
|
* when a device is enabled using managed PCI device enable interface.
|
|
*/
|
|
struct pci_devres {
|
|
unsigned int enabled:1;
|
|
unsigned int pinned:1;
|
|
unsigned int orig_intx:1;
|
|
unsigned int restore_intx:1;
|
|
unsigned int mwi:1;
|
|
u32 region_mask;
|
|
};
|
|
|
|
static void pcim_release(struct device *gendev, void *res)
|
|
{
|
|
struct pci_dev *dev = to_pci_dev(gendev);
|
|
struct pci_devres *this = res;
|
|
int i;
|
|
|
|
for (i = 0; i < DEVICE_COUNT_RESOURCE; i++)
|
|
if (this->region_mask & (1 << i))
|
|
pci_release_region(dev, i);
|
|
|
|
if (this->mwi)
|
|
pci_clear_mwi(dev);
|
|
|
|
if (this->restore_intx)
|
|
pci_intx(dev, this->orig_intx);
|
|
|
|
if (this->enabled && !this->pinned)
|
|
pci_disable_device(dev);
|
|
}
|
|
|
|
static struct pci_devres *get_pci_dr(struct pci_dev *pdev)
|
|
{
|
|
struct pci_devres *dr, *new_dr;
|
|
|
|
dr = devres_find(&pdev->dev, pcim_release, NULL, NULL);
|
|
if (dr)
|
|
return dr;
|
|
|
|
new_dr = devres_alloc(pcim_release, sizeof(*new_dr), GFP_KERNEL);
|
|
if (!new_dr)
|
|
return NULL;
|
|
return devres_get(&pdev->dev, new_dr, NULL, NULL);
|
|
}
|
|
|
|
static struct pci_devres *find_pci_dr(struct pci_dev *pdev)
|
|
{
|
|
if (pci_is_managed(pdev))
|
|
return devres_find(&pdev->dev, pcim_release, NULL, NULL);
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* pcim_enable_device - Managed pci_enable_device()
|
|
* @pdev: PCI device to be initialized
|
|
*
|
|
* Managed pci_enable_device().
|
|
*/
|
|
int pcim_enable_device(struct pci_dev *pdev)
|
|
{
|
|
struct pci_devres *dr;
|
|
int rc;
|
|
|
|
dr = get_pci_dr(pdev);
|
|
if (unlikely(!dr))
|
|
return -ENOMEM;
|
|
if (dr->enabled)
|
|
return 0;
|
|
|
|
rc = pci_enable_device(pdev);
|
|
if (!rc) {
|
|
pdev->is_managed = 1;
|
|
dr->enabled = 1;
|
|
}
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL(pcim_enable_device);
|
|
|
|
/**
|
|
* pcim_pin_device - Pin managed PCI device
|
|
* @pdev: PCI device to pin
|
|
*
|
|
* Pin managed PCI device @pdev. Pinned device won't be disabled on
|
|
* driver detach. @pdev must have been enabled with
|
|
* pcim_enable_device().
|
|
*/
|
|
void pcim_pin_device(struct pci_dev *pdev)
|
|
{
|
|
struct pci_devres *dr;
|
|
|
|
dr = find_pci_dr(pdev);
|
|
WARN_ON(!dr || !dr->enabled);
|
|
if (dr)
|
|
dr->pinned = 1;
|
|
}
|
|
EXPORT_SYMBOL(pcim_pin_device);
|
|
|
|
/*
|
|
* pcibios_device_add - provide arch specific hooks when adding device dev
|
|
* @dev: the PCI device being added
|
|
*
|
|
* Permits the platform to provide architecture specific functionality when
|
|
* devices are added. This is the default implementation. Architecture
|
|
* implementations can override this.
|
|
*/
|
|
int __weak pcibios_device_add(struct pci_dev *dev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pcibios_release_device - provide arch specific hooks when releasing
|
|
* device dev
|
|
* @dev: the PCI device being released
|
|
*
|
|
* Permits the platform to provide architecture specific functionality when
|
|
* devices are released. This is the default implementation. Architecture
|
|
* implementations can override this.
|
|
*/
|
|
void __weak pcibios_release_device(struct pci_dev *dev) {}
|
|
|
|
/**
|
|
* pcibios_disable_device - disable arch specific PCI resources for device dev
|
|
* @dev: the PCI device to disable
|
|
*
|
|
* Disables architecture specific PCI resources for the device. This
|
|
* is the default implementation. Architecture implementations can
|
|
* override this.
|
|
*/
|
|
void __weak pcibios_disable_device(struct pci_dev *dev) {}
|
|
|
|
/**
|
|
* pcibios_penalize_isa_irq - penalize an ISA IRQ
|
|
* @irq: ISA IRQ to penalize
|
|
* @active: IRQ active or not
|
|
*
|
|
* Permits the platform to provide architecture-specific functionality when
|
|
* penalizing ISA IRQs. This is the default implementation. Architecture
|
|
* implementations can override this.
|
|
*/
|
|
void __weak pcibios_penalize_isa_irq(int irq, int active) {}
|
|
|
|
static void do_pci_disable_device(struct pci_dev *dev)
|
|
{
|
|
u16 pci_command;
|
|
|
|
pci_read_config_word(dev, PCI_COMMAND, &pci_command);
|
|
if (pci_command & PCI_COMMAND_MASTER) {
|
|
pci_command &= ~PCI_COMMAND_MASTER;
|
|
pci_write_config_word(dev, PCI_COMMAND, pci_command);
|
|
}
|
|
|
|
pcibios_disable_device(dev);
|
|
}
|
|
|
|
/**
|
|
* pci_disable_enabled_device - Disable device without updating enable_cnt
|
|
* @dev: PCI device to disable
|
|
*
|
|
* NOTE: This function is a backend of PCI power management routines and is
|
|
* not supposed to be called drivers.
|
|
*/
|
|
void pci_disable_enabled_device(struct pci_dev *dev)
|
|
{
|
|
if (pci_is_enabled(dev))
|
|
do_pci_disable_device(dev);
|
|
}
|
|
|
|
/**
|
|
* pci_disable_device - Disable PCI device after use
|
|
* @dev: PCI device to be disabled
|
|
*
|
|
* Signal to the system that the PCI device is not in use by the system
|
|
* anymore. This only involves disabling PCI bus-mastering, if active.
|
|
*
|
|
* Note we don't actually disable the device until all callers of
|
|
* pci_enable_device() have called pci_disable_device().
|
|
*/
|
|
void pci_disable_device(struct pci_dev *dev)
|
|
{
|
|
struct pci_devres *dr;
|
|
|
|
dr = find_pci_dr(dev);
|
|
if (dr)
|
|
dr->enabled = 0;
|
|
|
|
dev_WARN_ONCE(&dev->dev, atomic_read(&dev->enable_cnt) <= 0,
|
|
"disabling already-disabled device");
|
|
|
|
if (atomic_dec_return(&dev->enable_cnt) != 0)
|
|
return;
|
|
|
|
do_pci_disable_device(dev);
|
|
|
|
dev->is_busmaster = 0;
|
|
}
|
|
EXPORT_SYMBOL(pci_disable_device);
|
|
|
|
/**
|
|
* pcibios_set_pcie_reset_state - set reset state for device dev
|
|
* @dev: the PCIe device reset
|
|
* @state: Reset state to enter into
|
|
*
|
|
* Set the PCIe reset state for the device. This is the default
|
|
* implementation. Architecture implementations can override this.
|
|
*/
|
|
int __weak pcibios_set_pcie_reset_state(struct pci_dev *dev,
|
|
enum pcie_reset_state state)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
/**
|
|
* pci_set_pcie_reset_state - set reset state for device dev
|
|
* @dev: the PCIe device reset
|
|
* @state: Reset state to enter into
|
|
*
|
|
* Sets the PCI reset state for the device.
|
|
*/
|
|
int pci_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state state)
|
|
{
|
|
return pcibios_set_pcie_reset_state(dev, state);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_set_pcie_reset_state);
|
|
|
|
#ifdef CONFIG_PCIEAER
|
|
void pcie_clear_device_status(struct pci_dev *dev)
|
|
{
|
|
u16 sta;
|
|
|
|
pcie_capability_read_word(dev, PCI_EXP_DEVSTA, &sta);
|
|
pcie_capability_write_word(dev, PCI_EXP_DEVSTA, sta);
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* pcie_clear_root_pme_status - Clear root port PME interrupt status.
|
|
* @dev: PCIe root port or event collector.
|
|
*/
|
|
void pcie_clear_root_pme_status(struct pci_dev *dev)
|
|
{
|
|
pcie_capability_set_dword(dev, PCI_EXP_RTSTA, PCI_EXP_RTSTA_PME);
|
|
}
|
|
|
|
/**
|
|
* pci_check_pme_status - Check if given device has generated PME.
|
|
* @dev: Device to check.
|
|
*
|
|
* Check the PME status of the device and if set, clear it and clear PME enable
|
|
* (if set). Return 'true' if PME status and PME enable were both set or
|
|
* 'false' otherwise.
|
|
*/
|
|
bool pci_check_pme_status(struct pci_dev *dev)
|
|
{
|
|
int pmcsr_pos;
|
|
u16 pmcsr;
|
|
bool ret = false;
|
|
|
|
if (!dev->pm_cap)
|
|
return false;
|
|
|
|
pmcsr_pos = dev->pm_cap + PCI_PM_CTRL;
|
|
pci_read_config_word(dev, pmcsr_pos, &pmcsr);
|
|
if (!(pmcsr & PCI_PM_CTRL_PME_STATUS))
|
|
return false;
|
|
|
|
/* Clear PME status. */
|
|
pmcsr |= PCI_PM_CTRL_PME_STATUS;
|
|
if (pmcsr & PCI_PM_CTRL_PME_ENABLE) {
|
|
/* Disable PME to avoid interrupt flood. */
|
|
pmcsr &= ~PCI_PM_CTRL_PME_ENABLE;
|
|
ret = true;
|
|
}
|
|
|
|
pci_write_config_word(dev, pmcsr_pos, pmcsr);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* pci_pme_wakeup - Wake up a PCI device if its PME Status bit is set.
|
|
* @dev: Device to handle.
|
|
* @pme_poll_reset: Whether or not to reset the device's pme_poll flag.
|
|
*
|
|
* Check if @dev has generated PME and queue a resume request for it in that
|
|
* case.
|
|
*/
|
|
static int pci_pme_wakeup(struct pci_dev *dev, void *pme_poll_reset)
|
|
{
|
|
if (pme_poll_reset && dev->pme_poll)
|
|
dev->pme_poll = false;
|
|
|
|
if (pci_check_pme_status(dev)) {
|
|
pci_wakeup_event(dev);
|
|
pm_request_resume(&dev->dev);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pci_pme_wakeup_bus - Walk given bus and wake up devices on it, if necessary.
|
|
* @bus: Top bus of the subtree to walk.
|
|
*/
|
|
void pci_pme_wakeup_bus(struct pci_bus *bus)
|
|
{
|
|
if (bus)
|
|
pci_walk_bus(bus, pci_pme_wakeup, (void *)true);
|
|
}
|
|
|
|
|
|
/**
|
|
* pci_pme_capable - check the capability of PCI device to generate PME#
|
|
* @dev: PCI device to handle.
|
|
* @state: PCI state from which device will issue PME#.
|
|
*/
|
|
bool pci_pme_capable(struct pci_dev *dev, pci_power_t state)
|
|
{
|
|
if (!dev->pm_cap)
|
|
return false;
|
|
|
|
return !!(dev->pme_support & (1 << state));
|
|
}
|
|
EXPORT_SYMBOL(pci_pme_capable);
|
|
|
|
static void pci_pme_list_scan(struct work_struct *work)
|
|
{
|
|
struct pci_pme_device *pme_dev, *n;
|
|
|
|
mutex_lock(&pci_pme_list_mutex);
|
|
list_for_each_entry_safe(pme_dev, n, &pci_pme_list, list) {
|
|
if (pme_dev->dev->pme_poll) {
|
|
struct pci_dev *bridge;
|
|
|
|
bridge = pme_dev->dev->bus->self;
|
|
/*
|
|
* If bridge is in low power state, the
|
|
* configuration space of subordinate devices
|
|
* may be not accessible
|
|
*/
|
|
if (bridge && bridge->current_state != PCI_D0)
|
|
continue;
|
|
/*
|
|
* If the device is in D3cold it should not be
|
|
* polled either.
|
|
*/
|
|
if (pme_dev->dev->current_state == PCI_D3cold)
|
|
continue;
|
|
|
|
pci_pme_wakeup(pme_dev->dev, NULL);
|
|
} else {
|
|
list_del(&pme_dev->list);
|
|
kfree(pme_dev);
|
|
}
|
|
}
|
|
if (!list_empty(&pci_pme_list))
|
|
queue_delayed_work(system_freezable_wq, &pci_pme_work,
|
|
msecs_to_jiffies(PME_TIMEOUT));
|
|
mutex_unlock(&pci_pme_list_mutex);
|
|
}
|
|
|
|
static void __pci_pme_active(struct pci_dev *dev, bool enable)
|
|
{
|
|
u16 pmcsr;
|
|
|
|
if (!dev->pme_support)
|
|
return;
|
|
|
|
pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
|
|
/* Clear PME_Status by writing 1 to it and enable PME# */
|
|
pmcsr |= PCI_PM_CTRL_PME_STATUS | PCI_PM_CTRL_PME_ENABLE;
|
|
if (!enable)
|
|
pmcsr &= ~PCI_PM_CTRL_PME_ENABLE;
|
|
|
|
pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, pmcsr);
|
|
}
|
|
|
|
/**
|
|
* pci_pme_restore - Restore PME configuration after config space restore.
|
|
* @dev: PCI device to update.
|
|
*/
|
|
void pci_pme_restore(struct pci_dev *dev)
|
|
{
|
|
u16 pmcsr;
|
|
|
|
if (!dev->pme_support)
|
|
return;
|
|
|
|
pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
|
|
if (dev->wakeup_prepared) {
|
|
pmcsr |= PCI_PM_CTRL_PME_ENABLE;
|
|
pmcsr &= ~PCI_PM_CTRL_PME_STATUS;
|
|
} else {
|
|
pmcsr &= ~PCI_PM_CTRL_PME_ENABLE;
|
|
pmcsr |= PCI_PM_CTRL_PME_STATUS;
|
|
}
|
|
pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, pmcsr);
|
|
}
|
|
|
|
/**
|
|
* pci_pme_active - enable or disable PCI device's PME# function
|
|
* @dev: PCI device to handle.
|
|
* @enable: 'true' to enable PME# generation; 'false' to disable it.
|
|
*
|
|
* The caller must verify that the device is capable of generating PME# before
|
|
* calling this function with @enable equal to 'true'.
|
|
*/
|
|
void pci_pme_active(struct pci_dev *dev, bool enable)
|
|
{
|
|
__pci_pme_active(dev, enable);
|
|
|
|
/*
|
|
* PCI (as opposed to PCIe) PME requires that the device have
|
|
* its PME# line hooked up correctly. Not all hardware vendors
|
|
* do this, so the PME never gets delivered and the device
|
|
* remains asleep. The easiest way around this is to
|
|
* periodically walk the list of suspended devices and check
|
|
* whether any have their PME flag set. The assumption is that
|
|
* we'll wake up often enough anyway that this won't be a huge
|
|
* hit, and the power savings from the devices will still be a
|
|
* win.
|
|
*
|
|
* Although PCIe uses in-band PME message instead of PME# line
|
|
* to report PME, PME does not work for some PCIe devices in
|
|
* reality. For example, there are devices that set their PME
|
|
* status bits, but don't really bother to send a PME message;
|
|
* there are PCI Express Root Ports that don't bother to
|
|
* trigger interrupts when they receive PME messages from the
|
|
* devices below. So PME poll is used for PCIe devices too.
|
|
*/
|
|
|
|
if (dev->pme_poll) {
|
|
struct pci_pme_device *pme_dev;
|
|
if (enable) {
|
|
pme_dev = kmalloc(sizeof(struct pci_pme_device),
|
|
GFP_KERNEL);
|
|
if (!pme_dev) {
|
|
pci_warn(dev, "can't enable PME#\n");
|
|
return;
|
|
}
|
|
pme_dev->dev = dev;
|
|
mutex_lock(&pci_pme_list_mutex);
|
|
list_add(&pme_dev->list, &pci_pme_list);
|
|
if (list_is_singular(&pci_pme_list))
|
|
queue_delayed_work(system_freezable_wq,
|
|
&pci_pme_work,
|
|
msecs_to_jiffies(PME_TIMEOUT));
|
|
mutex_unlock(&pci_pme_list_mutex);
|
|
} else {
|
|
mutex_lock(&pci_pme_list_mutex);
|
|
list_for_each_entry(pme_dev, &pci_pme_list, list) {
|
|
if (pme_dev->dev == dev) {
|
|
list_del(&pme_dev->list);
|
|
kfree(pme_dev);
|
|
break;
|
|
}
|
|
}
|
|
mutex_unlock(&pci_pme_list_mutex);
|
|
}
|
|
}
|
|
|
|
pci_dbg(dev, "PME# %s\n", enable ? "enabled" : "disabled");
|
|
}
|
|
EXPORT_SYMBOL(pci_pme_active);
|
|
|
|
/**
|
|
* __pci_enable_wake - enable PCI device as wakeup event source
|
|
* @dev: PCI device affected
|
|
* @state: PCI state from which device will issue wakeup events
|
|
* @enable: True to enable event generation; false to disable
|
|
*
|
|
* This enables the device as a wakeup event source, or disables it.
|
|
* When such events involves platform-specific hooks, those hooks are
|
|
* called automatically by this routine.
|
|
*
|
|
* Devices with legacy power management (no standard PCI PM capabilities)
|
|
* always require such platform hooks.
|
|
*
|
|
* RETURN VALUE:
|
|
* 0 is returned on success
|
|
* -EINVAL is returned if device is not supposed to wake up the system
|
|
* Error code depending on the platform is returned if both the platform and
|
|
* the native mechanism fail to enable the generation of wake-up events
|
|
*/
|
|
static int __pci_enable_wake(struct pci_dev *dev, pci_power_t state, bool enable)
|
|
{
|
|
int ret = 0;
|
|
|
|
/*
|
|
* Bridges that are not power-manageable directly only signal
|
|
* wakeup on behalf of subordinate devices which is set up
|
|
* elsewhere, so skip them. However, bridges that are
|
|
* power-manageable may signal wakeup for themselves (for example,
|
|
* on a hotplug event) and they need to be covered here.
|
|
*/
|
|
if (!pci_power_manageable(dev))
|
|
return 0;
|
|
|
|
/* Don't do the same thing twice in a row for one device. */
|
|
if (!!enable == !!dev->wakeup_prepared)
|
|
return 0;
|
|
|
|
/*
|
|
* According to "PCI System Architecture" 4th ed. by Tom Shanley & Don
|
|
* Anderson we should be doing PME# wake enable followed by ACPI wake
|
|
* enable. To disable wake-up we call the platform first, for symmetry.
|
|
*/
|
|
|
|
if (enable) {
|
|
int error;
|
|
|
|
/*
|
|
* Enable PME signaling if the device can signal PME from
|
|
* D3cold regardless of whether or not it can signal PME from
|
|
* the current target state, because that will allow it to
|
|
* signal PME when the hierarchy above it goes into D3cold and
|
|
* the device itself ends up in D3cold as a result of that.
|
|
*/
|
|
if (pci_pme_capable(dev, state) || pci_pme_capable(dev, PCI_D3cold))
|
|
pci_pme_active(dev, true);
|
|
else
|
|
ret = 1;
|
|
error = platform_pci_set_wakeup(dev, true);
|
|
if (ret)
|
|
ret = error;
|
|
if (!ret)
|
|
dev->wakeup_prepared = true;
|
|
} else {
|
|
platform_pci_set_wakeup(dev, false);
|
|
pci_pme_active(dev, false);
|
|
dev->wakeup_prepared = false;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* pci_enable_wake - change wakeup settings for a PCI device
|
|
* @pci_dev: Target device
|
|
* @state: PCI state from which device will issue wakeup events
|
|
* @enable: Whether or not to enable event generation
|
|
*
|
|
* If @enable is set, check device_may_wakeup() for the device before calling
|
|
* __pci_enable_wake() for it.
|
|
*/
|
|
int pci_enable_wake(struct pci_dev *pci_dev, pci_power_t state, bool enable)
|
|
{
|
|
if (enable && !device_may_wakeup(&pci_dev->dev))
|
|
return -EINVAL;
|
|
|
|
return __pci_enable_wake(pci_dev, state, enable);
|
|
}
|
|
EXPORT_SYMBOL(pci_enable_wake);
|
|
|
|
/**
|
|
* pci_wake_from_d3 - enable/disable device to wake up from D3_hot or D3_cold
|
|
* @dev: PCI device to prepare
|
|
* @enable: True to enable wake-up event generation; false to disable
|
|
*
|
|
* Many drivers want the device to wake up the system from D3_hot or D3_cold
|
|
* and this function allows them to set that up cleanly - pci_enable_wake()
|
|
* should not be called twice in a row to enable wake-up due to PCI PM vs ACPI
|
|
* ordering constraints.
|
|
*
|
|
* This function only returns error code if the device is not allowed to wake
|
|
* up the system from sleep or it is not capable of generating PME# from both
|
|
* D3_hot and D3_cold and the platform is unable to enable wake-up power for it.
|
|
*/
|
|
int pci_wake_from_d3(struct pci_dev *dev, bool enable)
|
|
{
|
|
return pci_pme_capable(dev, PCI_D3cold) ?
|
|
pci_enable_wake(dev, PCI_D3cold, enable) :
|
|
pci_enable_wake(dev, PCI_D3hot, enable);
|
|
}
|
|
EXPORT_SYMBOL(pci_wake_from_d3);
|
|
|
|
/**
|
|
* pci_target_state - find an appropriate low power state for a given PCI dev
|
|
* @dev: PCI device
|
|
* @wakeup: Whether or not wakeup functionality will be enabled for the device.
|
|
*
|
|
* Use underlying platform code to find a supported low power state for @dev.
|
|
* If the platform can't manage @dev, return the deepest state from which it
|
|
* can generate wake events, based on any available PME info.
|
|
*/
|
|
static pci_power_t pci_target_state(struct pci_dev *dev, bool wakeup)
|
|
{
|
|
if (platform_pci_power_manageable(dev)) {
|
|
/*
|
|
* Call the platform to find the target state for the device.
|
|
*/
|
|
pci_power_t state = platform_pci_choose_state(dev);
|
|
|
|
switch (state) {
|
|
case PCI_POWER_ERROR:
|
|
case PCI_UNKNOWN:
|
|
return PCI_D3hot;
|
|
|
|
case PCI_D1:
|
|
case PCI_D2:
|
|
if (pci_no_d1d2(dev))
|
|
return PCI_D3hot;
|
|
}
|
|
|
|
return state;
|
|
}
|
|
|
|
/*
|
|
* If the device is in D3cold even though it's not power-manageable by
|
|
* the platform, it may have been powered down by non-standard means.
|
|
* Best to let it slumber.
|
|
*/
|
|
if (dev->current_state == PCI_D3cold)
|
|
return PCI_D3cold;
|
|
else if (!dev->pm_cap)
|
|
return PCI_D0;
|
|
|
|
if (wakeup && dev->pme_support) {
|
|
pci_power_t state = PCI_D3hot;
|
|
|
|
/*
|
|
* Find the deepest state from which the device can generate
|
|
* PME#.
|
|
*/
|
|
while (state && !(dev->pme_support & (1 << state)))
|
|
state--;
|
|
|
|
if (state)
|
|
return state;
|
|
else if (dev->pme_support & 1)
|
|
return PCI_D0;
|
|
}
|
|
|
|
return PCI_D3hot;
|
|
}
|
|
|
|
/**
|
|
* pci_prepare_to_sleep - prepare PCI device for system-wide transition
|
|
* into a sleep state
|
|
* @dev: Device to handle.
|
|
*
|
|
* Choose the power state appropriate for the device depending on whether
|
|
* it can wake up the system and/or is power manageable by the platform
|
|
* (PCI_D3hot is the default) and put the device into that state.
|
|
*/
|
|
int pci_prepare_to_sleep(struct pci_dev *dev)
|
|
{
|
|
bool wakeup = device_may_wakeup(&dev->dev);
|
|
pci_power_t target_state = pci_target_state(dev, wakeup);
|
|
int error;
|
|
|
|
if (target_state == PCI_POWER_ERROR)
|
|
return -EIO;
|
|
|
|
pci_enable_wake(dev, target_state, wakeup);
|
|
|
|
error = pci_set_power_state(dev, target_state);
|
|
|
|
if (error)
|
|
pci_enable_wake(dev, target_state, false);
|
|
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL(pci_prepare_to_sleep);
|
|
|
|
/**
|
|
* pci_back_from_sleep - turn PCI device on during system-wide transition
|
|
* into working state
|
|
* @dev: Device to handle.
|
|
*
|
|
* Disable device's system wake-up capability and put it into D0.
|
|
*/
|
|
int pci_back_from_sleep(struct pci_dev *dev)
|
|
{
|
|
int ret = pci_set_power_state(dev, PCI_D0);
|
|
|
|
if (ret)
|
|
return ret;
|
|
|
|
pci_enable_wake(dev, PCI_D0, false);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(pci_back_from_sleep);
|
|
|
|
/**
|
|
* pci_finish_runtime_suspend - Carry out PCI-specific part of runtime suspend.
|
|
* @dev: PCI device being suspended.
|
|
*
|
|
* Prepare @dev to generate wake-up events at run time and put it into a low
|
|
* power state.
|
|
*/
|
|
int pci_finish_runtime_suspend(struct pci_dev *dev)
|
|
{
|
|
pci_power_t target_state;
|
|
int error;
|
|
|
|
target_state = pci_target_state(dev, device_can_wakeup(&dev->dev));
|
|
if (target_state == PCI_POWER_ERROR)
|
|
return -EIO;
|
|
|
|
__pci_enable_wake(dev, target_state, pci_dev_run_wake(dev));
|
|
|
|
error = pci_set_power_state(dev, target_state);
|
|
|
|
if (error)
|
|
pci_enable_wake(dev, target_state, false);
|
|
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* pci_dev_run_wake - Check if device can generate run-time wake-up events.
|
|
* @dev: Device to check.
|
|
*
|
|
* Return true if the device itself is capable of generating wake-up events
|
|
* (through the platform or using the native PCIe PME) or if the device supports
|
|
* PME and one of its upstream bridges can generate wake-up events.
|
|
*/
|
|
bool pci_dev_run_wake(struct pci_dev *dev)
|
|
{
|
|
struct pci_bus *bus = dev->bus;
|
|
|
|
if (!dev->pme_support)
|
|
return false;
|
|
|
|
/* PME-capable in principle, but not from the target power state */
|
|
if (!pci_pme_capable(dev, pci_target_state(dev, true)))
|
|
return false;
|
|
|
|
if (device_can_wakeup(&dev->dev))
|
|
return true;
|
|
|
|
while (bus->parent) {
|
|
struct pci_dev *bridge = bus->self;
|
|
|
|
if (device_can_wakeup(&bridge->dev))
|
|
return true;
|
|
|
|
bus = bus->parent;
|
|
}
|
|
|
|
/* We have reached the root bus. */
|
|
if (bus->bridge)
|
|
return device_can_wakeup(bus->bridge);
|
|
|
|
return false;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_dev_run_wake);
|
|
|
|
/**
|
|
* pci_dev_need_resume - Check if it is necessary to resume the device.
|
|
* @pci_dev: Device to check.
|
|
*
|
|
* Return 'true' if the device is not runtime-suspended or it has to be
|
|
* reconfigured due to wakeup settings difference between system and runtime
|
|
* suspend, or the current power state of it is not suitable for the upcoming
|
|
* (system-wide) transition.
|
|
*/
|
|
bool pci_dev_need_resume(struct pci_dev *pci_dev)
|
|
{
|
|
struct device *dev = &pci_dev->dev;
|
|
pci_power_t target_state;
|
|
|
|
if (!pm_runtime_suspended(dev) || platform_pci_need_resume(pci_dev))
|
|
return true;
|
|
|
|
target_state = pci_target_state(pci_dev, device_may_wakeup(dev));
|
|
|
|
/*
|
|
* If the earlier platform check has not triggered, D3cold is just power
|
|
* removal on top of D3hot, so no need to resume the device in that
|
|
* case.
|
|
*/
|
|
return target_state != pci_dev->current_state &&
|
|
target_state != PCI_D3cold &&
|
|
pci_dev->current_state != PCI_D3hot;
|
|
}
|
|
|
|
/**
|
|
* pci_dev_adjust_pme - Adjust PME setting for a suspended device.
|
|
* @pci_dev: Device to check.
|
|
*
|
|
* If the device is suspended and it is not configured for system wakeup,
|
|
* disable PME for it to prevent it from waking up the system unnecessarily.
|
|
*
|
|
* Note that if the device's power state is D3cold and the platform check in
|
|
* pci_dev_need_resume() has not triggered, the device's configuration need not
|
|
* be changed.
|
|
*/
|
|
void pci_dev_adjust_pme(struct pci_dev *pci_dev)
|
|
{
|
|
struct device *dev = &pci_dev->dev;
|
|
|
|
spin_lock_irq(&dev->power.lock);
|
|
|
|
if (pm_runtime_suspended(dev) && !device_may_wakeup(dev) &&
|
|
pci_dev->current_state < PCI_D3cold)
|
|
__pci_pme_active(pci_dev, false);
|
|
|
|
spin_unlock_irq(&dev->power.lock);
|
|
}
|
|
|
|
/**
|
|
* pci_dev_complete_resume - Finalize resume from system sleep for a device.
|
|
* @pci_dev: Device to handle.
|
|
*
|
|
* If the device is runtime suspended and wakeup-capable, enable PME for it as
|
|
* it might have been disabled during the prepare phase of system suspend if
|
|
* the device was not configured for system wakeup.
|
|
*/
|
|
void pci_dev_complete_resume(struct pci_dev *pci_dev)
|
|
{
|
|
struct device *dev = &pci_dev->dev;
|
|
|
|
if (!pci_dev_run_wake(pci_dev))
|
|
return;
|
|
|
|
spin_lock_irq(&dev->power.lock);
|
|
|
|
if (pm_runtime_suspended(dev) && pci_dev->current_state < PCI_D3cold)
|
|
__pci_pme_active(pci_dev, true);
|
|
|
|
spin_unlock_irq(&dev->power.lock);
|
|
}
|
|
|
|
/**
|
|
* pci_choose_state - Choose the power state of a PCI device.
|
|
* @dev: Target PCI device.
|
|
* @state: Target state for the whole system.
|
|
*
|
|
* Returns PCI power state suitable for @dev and @state.
|
|
*/
|
|
pci_power_t pci_choose_state(struct pci_dev *dev, pm_message_t state)
|
|
{
|
|
if (state.event == PM_EVENT_ON)
|
|
return PCI_D0;
|
|
|
|
return pci_target_state(dev, false);
|
|
}
|
|
EXPORT_SYMBOL(pci_choose_state);
|
|
|
|
void pci_config_pm_runtime_get(struct pci_dev *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct device *parent = dev->parent;
|
|
|
|
if (parent)
|
|
pm_runtime_get_sync(parent);
|
|
pm_runtime_get_noresume(dev);
|
|
/*
|
|
* pdev->current_state is set to PCI_D3cold during suspending,
|
|
* so wait until suspending completes
|
|
*/
|
|
pm_runtime_barrier(dev);
|
|
/*
|
|
* Only need to resume devices in D3cold, because config
|
|
* registers are still accessible for devices suspended but
|
|
* not in D3cold.
|
|
*/
|
|
if (pdev->current_state == PCI_D3cold)
|
|
pm_runtime_resume(dev);
|
|
}
|
|
|
|
void pci_config_pm_runtime_put(struct pci_dev *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct device *parent = dev->parent;
|
|
|
|
pm_runtime_put(dev);
|
|
if (parent)
|
|
pm_runtime_put_sync(parent);
|
|
}
|
|
|
|
static const struct dmi_system_id bridge_d3_blacklist[] = {
|
|
#ifdef CONFIG_X86
|
|
{
|
|
/*
|
|
* Gigabyte X299 root port is not marked as hotplug capable
|
|
* which allows Linux to power manage it. However, this
|
|
* confuses the BIOS SMI handler so don't power manage root
|
|
* ports on that system.
|
|
*/
|
|
.ident = "X299 DESIGNARE EX-CF",
|
|
.matches = {
|
|
DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
|
|
DMI_MATCH(DMI_BOARD_NAME, "X299 DESIGNARE EX-CF"),
|
|
},
|
|
},
|
|
{
|
|
/*
|
|
* Downstream device is not accessible after putting a root port
|
|
* into D3cold and back into D0 on Elo i2.
|
|
*/
|
|
.ident = "Elo i2",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Elo Touch Solutions"),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "Elo i2"),
|
|
DMI_MATCH(DMI_PRODUCT_VERSION, "RevB"),
|
|
},
|
|
},
|
|
#endif
|
|
{ }
|
|
};
|
|
|
|
/**
|
|
* pci_bridge_d3_possible - Is it possible to put the bridge into D3
|
|
* @bridge: Bridge to check
|
|
*
|
|
* This function checks if it is possible to move the bridge to D3.
|
|
* Currently we only allow D3 for recent enough PCIe ports and Thunderbolt.
|
|
*/
|
|
bool pci_bridge_d3_possible(struct pci_dev *bridge)
|
|
{
|
|
if (!pci_is_pcie(bridge))
|
|
return false;
|
|
|
|
switch (pci_pcie_type(bridge)) {
|
|
case PCI_EXP_TYPE_ROOT_PORT:
|
|
case PCI_EXP_TYPE_UPSTREAM:
|
|
case PCI_EXP_TYPE_DOWNSTREAM:
|
|
if (pci_bridge_d3_disable)
|
|
return false;
|
|
|
|
/*
|
|
* Hotplug ports handled by firmware in System Management Mode
|
|
* may not be put into D3 by the OS (Thunderbolt on non-Macs).
|
|
*/
|
|
if (bridge->is_hotplug_bridge && !pciehp_is_native(bridge))
|
|
return false;
|
|
|
|
if (pci_bridge_d3_force)
|
|
return true;
|
|
|
|
/* Even the oldest 2010 Thunderbolt controller supports D3. */
|
|
if (bridge->is_thunderbolt)
|
|
return true;
|
|
|
|
/* Platform might know better if the bridge supports D3 */
|
|
if (platform_pci_bridge_d3(bridge))
|
|
return true;
|
|
|
|
/*
|
|
* Hotplug ports handled natively by the OS were not validated
|
|
* by vendors for runtime D3 at least until 2018 because there
|
|
* was no OS support.
|
|
*/
|
|
if (bridge->is_hotplug_bridge)
|
|
return false;
|
|
|
|
if (dmi_check_system(bridge_d3_blacklist))
|
|
return false;
|
|
|
|
/*
|
|
* It should be safe to put PCIe ports from 2015 or newer
|
|
* to D3.
|
|
*/
|
|
if (dmi_get_bios_year() >= 2015)
|
|
return true;
|
|
break;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static int pci_dev_check_d3cold(struct pci_dev *dev, void *data)
|
|
{
|
|
bool *d3cold_ok = data;
|
|
|
|
if (/* The device needs to be allowed to go D3cold ... */
|
|
dev->no_d3cold || !dev->d3cold_allowed ||
|
|
|
|
/* ... and if it is wakeup capable to do so from D3cold. */
|
|
(device_may_wakeup(&dev->dev) &&
|
|
!pci_pme_capable(dev, PCI_D3cold)) ||
|
|
|
|
/* If it is a bridge it must be allowed to go to D3. */
|
|
!pci_power_manageable(dev))
|
|
|
|
*d3cold_ok = false;
|
|
|
|
return !*d3cold_ok;
|
|
}
|
|
|
|
/*
|
|
* pci_bridge_d3_update - Update bridge D3 capabilities
|
|
* @dev: PCI device which is changed
|
|
*
|
|
* Update upstream bridge PM capabilities accordingly depending on if the
|
|
* device PM configuration was changed or the device is being removed. The
|
|
* change is also propagated upstream.
|
|
*/
|
|
void pci_bridge_d3_update(struct pci_dev *dev)
|
|
{
|
|
bool remove = !device_is_registered(&dev->dev);
|
|
struct pci_dev *bridge;
|
|
bool d3cold_ok = true;
|
|
|
|
bridge = pci_upstream_bridge(dev);
|
|
if (!bridge || !pci_bridge_d3_possible(bridge))
|
|
return;
|
|
|
|
/*
|
|
* If D3 is currently allowed for the bridge, removing one of its
|
|
* children won't change that.
|
|
*/
|
|
if (remove && bridge->bridge_d3)
|
|
return;
|
|
|
|
/*
|
|
* If D3 is currently allowed for the bridge and a child is added or
|
|
* changed, disallowance of D3 can only be caused by that child, so
|
|
* we only need to check that single device, not any of its siblings.
|
|
*
|
|
* If D3 is currently not allowed for the bridge, checking the device
|
|
* first may allow us to skip checking its siblings.
|
|
*/
|
|
if (!remove)
|
|
pci_dev_check_d3cold(dev, &d3cold_ok);
|
|
|
|
/*
|
|
* If D3 is currently not allowed for the bridge, this may be caused
|
|
* either by the device being changed/removed or any of its siblings,
|
|
* so we need to go through all children to find out if one of them
|
|
* continues to block D3.
|
|
*/
|
|
if (d3cold_ok && !bridge->bridge_d3)
|
|
pci_walk_bus(bridge->subordinate, pci_dev_check_d3cold,
|
|
&d3cold_ok);
|
|
|
|
if (bridge->bridge_d3 != d3cold_ok) {
|
|
bridge->bridge_d3 = d3cold_ok;
|
|
/* Propagate change to upstream bridges */
|
|
pci_bridge_d3_update(bridge);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* pci_d3cold_enable - Enable D3cold for device
|
|
* @dev: PCI device to handle
|
|
*
|
|
* This function can be used in drivers to enable D3cold from the device
|
|
* they handle. It also updates upstream PCI bridge PM capabilities
|
|
* accordingly.
|
|
*/
|
|
void pci_d3cold_enable(struct pci_dev *dev)
|
|
{
|
|
if (dev->no_d3cold) {
|
|
dev->no_d3cold = false;
|
|
pci_bridge_d3_update(dev);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_d3cold_enable);
|
|
|
|
/**
|
|
* pci_d3cold_disable - Disable D3cold for device
|
|
* @dev: PCI device to handle
|
|
*
|
|
* This function can be used in drivers to disable D3cold from the device
|
|
* they handle. It also updates upstream PCI bridge PM capabilities
|
|
* accordingly.
|
|
*/
|
|
void pci_d3cold_disable(struct pci_dev *dev)
|
|
{
|
|
if (!dev->no_d3cold) {
|
|
dev->no_d3cold = true;
|
|
pci_bridge_d3_update(dev);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_d3cold_disable);
|
|
|
|
/**
|
|
* pci_pm_init - Initialize PM functions of given PCI device
|
|
* @dev: PCI device to handle.
|
|
*/
|
|
void pci_pm_init(struct pci_dev *dev)
|
|
{
|
|
int pm;
|
|
u16 status;
|
|
u16 pmc;
|
|
|
|
pm_runtime_forbid(&dev->dev);
|
|
pm_runtime_set_active(&dev->dev);
|
|
pm_runtime_enable(&dev->dev);
|
|
device_enable_async_suspend(&dev->dev);
|
|
dev->wakeup_prepared = false;
|
|
|
|
dev->pm_cap = 0;
|
|
dev->pme_support = 0;
|
|
|
|
/* find PCI PM capability in list */
|
|
pm = pci_find_capability(dev, PCI_CAP_ID_PM);
|
|
if (!pm)
|
|
return;
|
|
/* Check device's ability to generate PME# */
|
|
pci_read_config_word(dev, pm + PCI_PM_PMC, &pmc);
|
|
|
|
if ((pmc & PCI_PM_CAP_VER_MASK) > 3) {
|
|
pci_err(dev, "unsupported PM cap regs version (%u)\n",
|
|
pmc & PCI_PM_CAP_VER_MASK);
|
|
return;
|
|
}
|
|
|
|
dev->pm_cap = pm;
|
|
dev->d3hot_delay = PCI_PM_D3HOT_WAIT;
|
|
dev->d3cold_delay = PCI_PM_D3COLD_WAIT;
|
|
dev->bridge_d3 = pci_bridge_d3_possible(dev);
|
|
dev->d3cold_allowed = true;
|
|
|
|
dev->d1_support = false;
|
|
dev->d2_support = false;
|
|
if (!pci_no_d1d2(dev)) {
|
|
if (pmc & PCI_PM_CAP_D1)
|
|
dev->d1_support = true;
|
|
if (pmc & PCI_PM_CAP_D2)
|
|
dev->d2_support = true;
|
|
|
|
if (dev->d1_support || dev->d2_support)
|
|
pci_info(dev, "supports%s%s\n",
|
|
dev->d1_support ? " D1" : "",
|
|
dev->d2_support ? " D2" : "");
|
|
}
|
|
|
|
pmc &= PCI_PM_CAP_PME_MASK;
|
|
if (pmc) {
|
|
pci_info(dev, "PME# supported from%s%s%s%s%s\n",
|
|
(pmc & PCI_PM_CAP_PME_D0) ? " D0" : "",
|
|
(pmc & PCI_PM_CAP_PME_D1) ? " D1" : "",
|
|
(pmc & PCI_PM_CAP_PME_D2) ? " D2" : "",
|
|
(pmc & PCI_PM_CAP_PME_D3hot) ? " D3hot" : "",
|
|
(pmc & PCI_PM_CAP_PME_D3cold) ? " D3cold" : "");
|
|
dev->pme_support = pmc >> PCI_PM_CAP_PME_SHIFT;
|
|
dev->pme_poll = true;
|
|
/*
|
|
* Make device's PM flags reflect the wake-up capability, but
|
|
* let the user space enable it to wake up the system as needed.
|
|
*/
|
|
device_set_wakeup_capable(&dev->dev, true);
|
|
/* Disable the PME# generation functionality */
|
|
pci_pme_active(dev, false);
|
|
}
|
|
|
|
pci_read_config_word(dev, PCI_STATUS, &status);
|
|
if (status & PCI_STATUS_IMM_READY)
|
|
dev->imm_ready = 1;
|
|
}
|
|
|
|
static unsigned long pci_ea_flags(struct pci_dev *dev, u8 prop)
|
|
{
|
|
unsigned long flags = IORESOURCE_PCI_FIXED | IORESOURCE_PCI_EA_BEI;
|
|
|
|
switch (prop) {
|
|
case PCI_EA_P_MEM:
|
|
case PCI_EA_P_VF_MEM:
|
|
flags |= IORESOURCE_MEM;
|
|
break;
|
|
case PCI_EA_P_MEM_PREFETCH:
|
|
case PCI_EA_P_VF_MEM_PREFETCH:
|
|
flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH;
|
|
break;
|
|
case PCI_EA_P_IO:
|
|
flags |= IORESOURCE_IO;
|
|
break;
|
|
default:
|
|
return 0;
|
|
}
|
|
|
|
return flags;
|
|
}
|
|
|
|
static struct resource *pci_ea_get_resource(struct pci_dev *dev, u8 bei,
|
|
u8 prop)
|
|
{
|
|
if (bei <= PCI_EA_BEI_BAR5 && prop <= PCI_EA_P_IO)
|
|
return &dev->resource[bei];
|
|
#ifdef CONFIG_PCI_IOV
|
|
else if (bei >= PCI_EA_BEI_VF_BAR0 && bei <= PCI_EA_BEI_VF_BAR5 &&
|
|
(prop == PCI_EA_P_VF_MEM || prop == PCI_EA_P_VF_MEM_PREFETCH))
|
|
return &dev->resource[PCI_IOV_RESOURCES +
|
|
bei - PCI_EA_BEI_VF_BAR0];
|
|
#endif
|
|
else if (bei == PCI_EA_BEI_ROM)
|
|
return &dev->resource[PCI_ROM_RESOURCE];
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
/* Read an Enhanced Allocation (EA) entry */
|
|
static int pci_ea_read(struct pci_dev *dev, int offset)
|
|
{
|
|
struct resource *res;
|
|
int ent_size, ent_offset = offset;
|
|
resource_size_t start, end;
|
|
unsigned long flags;
|
|
u32 dw0, bei, base, max_offset;
|
|
u8 prop;
|
|
bool support_64 = (sizeof(resource_size_t) >= 8);
|
|
|
|
pci_read_config_dword(dev, ent_offset, &dw0);
|
|
ent_offset += 4;
|
|
|
|
/* Entry size field indicates DWORDs after 1st */
|
|
ent_size = ((dw0 & PCI_EA_ES) + 1) << 2;
|
|
|
|
if (!(dw0 & PCI_EA_ENABLE)) /* Entry not enabled */
|
|
goto out;
|
|
|
|
bei = (dw0 & PCI_EA_BEI) >> 4;
|
|
prop = (dw0 & PCI_EA_PP) >> 8;
|
|
|
|
/*
|
|
* If the Property is in the reserved range, try the Secondary
|
|
* Property instead.
|
|
*/
|
|
if (prop > PCI_EA_P_BRIDGE_IO && prop < PCI_EA_P_MEM_RESERVED)
|
|
prop = (dw0 & PCI_EA_SP) >> 16;
|
|
if (prop > PCI_EA_P_BRIDGE_IO)
|
|
goto out;
|
|
|
|
res = pci_ea_get_resource(dev, bei, prop);
|
|
if (!res) {
|
|
pci_err(dev, "Unsupported EA entry BEI: %u\n", bei);
|
|
goto out;
|
|
}
|
|
|
|
flags = pci_ea_flags(dev, prop);
|
|
if (!flags) {
|
|
pci_err(dev, "Unsupported EA properties: %#x\n", prop);
|
|
goto out;
|
|
}
|
|
|
|
/* Read Base */
|
|
pci_read_config_dword(dev, ent_offset, &base);
|
|
start = (base & PCI_EA_FIELD_MASK);
|
|
ent_offset += 4;
|
|
|
|
/* Read MaxOffset */
|
|
pci_read_config_dword(dev, ent_offset, &max_offset);
|
|
ent_offset += 4;
|
|
|
|
/* Read Base MSBs (if 64-bit entry) */
|
|
if (base & PCI_EA_IS_64) {
|
|
u32 base_upper;
|
|
|
|
pci_read_config_dword(dev, ent_offset, &base_upper);
|
|
ent_offset += 4;
|
|
|
|
flags |= IORESOURCE_MEM_64;
|
|
|
|
/* entry starts above 32-bit boundary, can't use */
|
|
if (!support_64 && base_upper)
|
|
goto out;
|
|
|
|
if (support_64)
|
|
start |= ((u64)base_upper << 32);
|
|
}
|
|
|
|
end = start + (max_offset | 0x03);
|
|
|
|
/* Read MaxOffset MSBs (if 64-bit entry) */
|
|
if (max_offset & PCI_EA_IS_64) {
|
|
u32 max_offset_upper;
|
|
|
|
pci_read_config_dword(dev, ent_offset, &max_offset_upper);
|
|
ent_offset += 4;
|
|
|
|
flags |= IORESOURCE_MEM_64;
|
|
|
|
/* entry too big, can't use */
|
|
if (!support_64 && max_offset_upper)
|
|
goto out;
|
|
|
|
if (support_64)
|
|
end += ((u64)max_offset_upper << 32);
|
|
}
|
|
|
|
if (end < start) {
|
|
pci_err(dev, "EA Entry crosses address boundary\n");
|
|
goto out;
|
|
}
|
|
|
|
if (ent_size != ent_offset - offset) {
|
|
pci_err(dev, "EA Entry Size (%d) does not match length read (%d)\n",
|
|
ent_size, ent_offset - offset);
|
|
goto out;
|
|
}
|
|
|
|
res->name = pci_name(dev);
|
|
res->start = start;
|
|
res->end = end;
|
|
res->flags = flags;
|
|
|
|
if (bei <= PCI_EA_BEI_BAR5)
|
|
pci_info(dev, "BAR %d: %pR (from Enhanced Allocation, properties %#02x)\n",
|
|
bei, res, prop);
|
|
else if (bei == PCI_EA_BEI_ROM)
|
|
pci_info(dev, "ROM: %pR (from Enhanced Allocation, properties %#02x)\n",
|
|
res, prop);
|
|
else if (bei >= PCI_EA_BEI_VF_BAR0 && bei <= PCI_EA_BEI_VF_BAR5)
|
|
pci_info(dev, "VF BAR %d: %pR (from Enhanced Allocation, properties %#02x)\n",
|
|
bei - PCI_EA_BEI_VF_BAR0, res, prop);
|
|
else
|
|
pci_info(dev, "BEI %d res: %pR (from Enhanced Allocation, properties %#02x)\n",
|
|
bei, res, prop);
|
|
|
|
out:
|
|
return offset + ent_size;
|
|
}
|
|
|
|
/* Enhanced Allocation Initialization */
|
|
void pci_ea_init(struct pci_dev *dev)
|
|
{
|
|
int ea;
|
|
u8 num_ent;
|
|
int offset;
|
|
int i;
|
|
|
|
/* find PCI EA capability in list */
|
|
ea = pci_find_capability(dev, PCI_CAP_ID_EA);
|
|
if (!ea)
|
|
return;
|
|
|
|
/* determine the number of entries */
|
|
pci_bus_read_config_byte(dev->bus, dev->devfn, ea + PCI_EA_NUM_ENT,
|
|
&num_ent);
|
|
num_ent &= PCI_EA_NUM_ENT_MASK;
|
|
|
|
offset = ea + PCI_EA_FIRST_ENT;
|
|
|
|
/* Skip DWORD 2 for type 1 functions */
|
|
if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)
|
|
offset += 4;
|
|
|
|
/* parse each EA entry */
|
|
for (i = 0; i < num_ent; ++i)
|
|
offset = pci_ea_read(dev, offset);
|
|
}
|
|
|
|
static void pci_add_saved_cap(struct pci_dev *pci_dev,
|
|
struct pci_cap_saved_state *new_cap)
|
|
{
|
|
hlist_add_head(&new_cap->next, &pci_dev->saved_cap_space);
|
|
}
|
|
|
|
/**
|
|
* _pci_add_cap_save_buffer - allocate buffer for saving given
|
|
* capability registers
|
|
* @dev: the PCI device
|
|
* @cap: the capability to allocate the buffer for
|
|
* @extended: Standard or Extended capability ID
|
|
* @size: requested size of the buffer
|
|
*/
|
|
static int _pci_add_cap_save_buffer(struct pci_dev *dev, u16 cap,
|
|
bool extended, unsigned int size)
|
|
{
|
|
int pos;
|
|
struct pci_cap_saved_state *save_state;
|
|
|
|
if (extended)
|
|
pos = pci_find_ext_capability(dev, cap);
|
|
else
|
|
pos = pci_find_capability(dev, cap);
|
|
|
|
if (!pos)
|
|
return 0;
|
|
|
|
save_state = kzalloc(sizeof(*save_state) + size, GFP_KERNEL);
|
|
if (!save_state)
|
|
return -ENOMEM;
|
|
|
|
save_state->cap.cap_nr = cap;
|
|
save_state->cap.cap_extended = extended;
|
|
save_state->cap.size = size;
|
|
pci_add_saved_cap(dev, save_state);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int pci_add_cap_save_buffer(struct pci_dev *dev, char cap, unsigned int size)
|
|
{
|
|
return _pci_add_cap_save_buffer(dev, cap, false, size);
|
|
}
|
|
|
|
int pci_add_ext_cap_save_buffer(struct pci_dev *dev, u16 cap, unsigned int size)
|
|
{
|
|
return _pci_add_cap_save_buffer(dev, cap, true, size);
|
|
}
|
|
|
|
/**
|
|
* pci_allocate_cap_save_buffers - allocate buffers for saving capabilities
|
|
* @dev: the PCI device
|
|
*/
|
|
void pci_allocate_cap_save_buffers(struct pci_dev *dev)
|
|
{
|
|
int error;
|
|
|
|
error = pci_add_cap_save_buffer(dev, PCI_CAP_ID_EXP,
|
|
PCI_EXP_SAVE_REGS * sizeof(u16));
|
|
if (error)
|
|
pci_err(dev, "unable to preallocate PCI Express save buffer\n");
|
|
|
|
error = pci_add_cap_save_buffer(dev, PCI_CAP_ID_PCIX, sizeof(u16));
|
|
if (error)
|
|
pci_err(dev, "unable to preallocate PCI-X save buffer\n");
|
|
|
|
error = pci_add_ext_cap_save_buffer(dev, PCI_EXT_CAP_ID_LTR,
|
|
2 * sizeof(u16));
|
|
if (error)
|
|
pci_err(dev, "unable to allocate suspend buffer for LTR\n");
|
|
|
|
error = pci_add_ext_cap_save_buffer(dev, PCI_EXT_CAP_ID_L1SS,
|
|
2 * sizeof(u32));
|
|
if (error)
|
|
pci_err(dev, "unable to allocate suspend buffer for ASPM-L1SS\n");
|
|
|
|
pci_allocate_vc_save_buffers(dev);
|
|
}
|
|
|
|
void pci_free_cap_save_buffers(struct pci_dev *dev)
|
|
{
|
|
struct pci_cap_saved_state *tmp;
|
|
struct hlist_node *n;
|
|
|
|
hlist_for_each_entry_safe(tmp, n, &dev->saved_cap_space, next)
|
|
kfree(tmp);
|
|
}
|
|
|
|
/**
|
|
* pci_configure_ari - enable or disable ARI forwarding
|
|
* @dev: the PCI device
|
|
*
|
|
* If @dev and its upstream bridge both support ARI, enable ARI in the
|
|
* bridge. Otherwise, disable ARI in the bridge.
|
|
*/
|
|
void pci_configure_ari(struct pci_dev *dev)
|
|
{
|
|
u32 cap;
|
|
struct pci_dev *bridge;
|
|
|
|
if (pcie_ari_disabled || !pci_is_pcie(dev) || dev->devfn)
|
|
return;
|
|
|
|
bridge = dev->bus->self;
|
|
if (!bridge)
|
|
return;
|
|
|
|
pcie_capability_read_dword(bridge, PCI_EXP_DEVCAP2, &cap);
|
|
if (!(cap & PCI_EXP_DEVCAP2_ARI))
|
|
return;
|
|
|
|
if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI)) {
|
|
pcie_capability_set_word(bridge, PCI_EXP_DEVCTL2,
|
|
PCI_EXP_DEVCTL2_ARI);
|
|
bridge->ari_enabled = 1;
|
|
} else {
|
|
pcie_capability_clear_word(bridge, PCI_EXP_DEVCTL2,
|
|
PCI_EXP_DEVCTL2_ARI);
|
|
bridge->ari_enabled = 0;
|
|
}
|
|
}
|
|
|
|
static bool pci_acs_flags_enabled(struct pci_dev *pdev, u16 acs_flags)
|
|
{
|
|
int pos;
|
|
u16 cap, ctrl;
|
|
|
|
pos = pdev->acs_cap;
|
|
if (!pos)
|
|
return false;
|
|
|
|
/*
|
|
* Except for egress control, capabilities are either required
|
|
* or only required if controllable. Features missing from the
|
|
* capability field can therefore be assumed as hard-wired enabled.
|
|
*/
|
|
pci_read_config_word(pdev, pos + PCI_ACS_CAP, &cap);
|
|
acs_flags &= (cap | PCI_ACS_EC);
|
|
|
|
pci_read_config_word(pdev, pos + PCI_ACS_CTRL, &ctrl);
|
|
return (ctrl & acs_flags) == acs_flags;
|
|
}
|
|
|
|
/**
|
|
* pci_acs_enabled - test ACS against required flags for a given device
|
|
* @pdev: device to test
|
|
* @acs_flags: required PCI ACS flags
|
|
*
|
|
* Return true if the device supports the provided flags. Automatically
|
|
* filters out flags that are not implemented on multifunction devices.
|
|
*
|
|
* Note that this interface checks the effective ACS capabilities of the
|
|
* device rather than the actual capabilities. For instance, most single
|
|
* function endpoints are not required to support ACS because they have no
|
|
* opportunity for peer-to-peer access. We therefore return 'true'
|
|
* regardless of whether the device exposes an ACS capability. This makes
|
|
* it much easier for callers of this function to ignore the actual type
|
|
* or topology of the device when testing ACS support.
|
|
*/
|
|
bool pci_acs_enabled(struct pci_dev *pdev, u16 acs_flags)
|
|
{
|
|
int ret;
|
|
|
|
ret = pci_dev_specific_acs_enabled(pdev, acs_flags);
|
|
if (ret >= 0)
|
|
return ret > 0;
|
|
|
|
/*
|
|
* Conventional PCI and PCI-X devices never support ACS, either
|
|
* effectively or actually. The shared bus topology implies that
|
|
* any device on the bus can receive or snoop DMA.
|
|
*/
|
|
if (!pci_is_pcie(pdev))
|
|
return false;
|
|
|
|
switch (pci_pcie_type(pdev)) {
|
|
/*
|
|
* PCI/X-to-PCIe bridges are not specifically mentioned by the spec,
|
|
* but since their primary interface is PCI/X, we conservatively
|
|
* handle them as we would a non-PCIe device.
|
|
*/
|
|
case PCI_EXP_TYPE_PCIE_BRIDGE:
|
|
/*
|
|
* PCIe 3.0, 6.12.1 excludes ACS on these devices. "ACS is never
|
|
* applicable... must never implement an ACS Extended Capability...".
|
|
* This seems arbitrary, but we take a conservative interpretation
|
|
* of this statement.
|
|
*/
|
|
case PCI_EXP_TYPE_PCI_BRIDGE:
|
|
case PCI_EXP_TYPE_RC_EC:
|
|
return false;
|
|
/*
|
|
* PCIe 3.0, 6.12.1.1 specifies that downstream and root ports should
|
|
* implement ACS in order to indicate their peer-to-peer capabilities,
|
|
* regardless of whether they are single- or multi-function devices.
|
|
*/
|
|
case PCI_EXP_TYPE_DOWNSTREAM:
|
|
case PCI_EXP_TYPE_ROOT_PORT:
|
|
return pci_acs_flags_enabled(pdev, acs_flags);
|
|
/*
|
|
* PCIe 3.0, 6.12.1.2 specifies ACS capabilities that should be
|
|
* implemented by the remaining PCIe types to indicate peer-to-peer
|
|
* capabilities, but only when they are part of a multifunction
|
|
* device. The footnote for section 6.12 indicates the specific
|
|
* PCIe types included here.
|
|
*/
|
|
case PCI_EXP_TYPE_ENDPOINT:
|
|
case PCI_EXP_TYPE_UPSTREAM:
|
|
case PCI_EXP_TYPE_LEG_END:
|
|
case PCI_EXP_TYPE_RC_END:
|
|
if (!pdev->multifunction)
|
|
break;
|
|
|
|
return pci_acs_flags_enabled(pdev, acs_flags);
|
|
}
|
|
|
|
/*
|
|
* PCIe 3.0, 6.12.1.3 specifies no ACS capabilities are applicable
|
|
* to single function devices with the exception of downstream ports.
|
|
*/
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* pci_acs_path_enabled - test ACS flags from start to end in a hierarchy
|
|
* @start: starting downstream device
|
|
* @end: ending upstream device or NULL to search to the root bus
|
|
* @acs_flags: required flags
|
|
*
|
|
* Walk up a device tree from start to end testing PCI ACS support. If
|
|
* any step along the way does not support the required flags, return false.
|
|
*/
|
|
bool pci_acs_path_enabled(struct pci_dev *start,
|
|
struct pci_dev *end, u16 acs_flags)
|
|
{
|
|
struct pci_dev *pdev, *parent = start;
|
|
|
|
do {
|
|
pdev = parent;
|
|
|
|
if (!pci_acs_enabled(pdev, acs_flags))
|
|
return false;
|
|
|
|
if (pci_is_root_bus(pdev->bus))
|
|
return (end == NULL);
|
|
|
|
parent = pdev->bus->self;
|
|
} while (pdev != end);
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* pci_acs_init - Initialize ACS if hardware supports it
|
|
* @dev: the PCI device
|
|
*/
|
|
void pci_acs_init(struct pci_dev *dev)
|
|
{
|
|
dev->acs_cap = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ACS);
|
|
|
|
/*
|
|
* Attempt to enable ACS regardless of capability because some Root
|
|
* Ports (e.g. those quirked with *_intel_pch_acs_*) do not have
|
|
* the standard ACS capability but still support ACS via those
|
|
* quirks.
|
|
*/
|
|
pci_enable_acs(dev);
|
|
}
|
|
|
|
/**
|
|
* pci_rebar_find_pos - find position of resize ctrl reg for BAR
|
|
* @pdev: PCI device
|
|
* @bar: BAR to find
|
|
*
|
|
* Helper to find the position of the ctrl register for a BAR.
|
|
* Returns -ENOTSUPP if resizable BARs are not supported at all.
|
|
* Returns -ENOENT if no ctrl register for the BAR could be found.
|
|
*/
|
|
static int pci_rebar_find_pos(struct pci_dev *pdev, int bar)
|
|
{
|
|
unsigned int pos, nbars, i;
|
|
u32 ctrl;
|
|
|
|
pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_REBAR);
|
|
if (!pos)
|
|
return -ENOTSUPP;
|
|
|
|
pci_read_config_dword(pdev, pos + PCI_REBAR_CTRL, &ctrl);
|
|
nbars = (ctrl & PCI_REBAR_CTRL_NBAR_MASK) >>
|
|
PCI_REBAR_CTRL_NBAR_SHIFT;
|
|
|
|
for (i = 0; i < nbars; i++, pos += 8) {
|
|
int bar_idx;
|
|
|
|
pci_read_config_dword(pdev, pos + PCI_REBAR_CTRL, &ctrl);
|
|
bar_idx = ctrl & PCI_REBAR_CTRL_BAR_IDX;
|
|
if (bar_idx == bar)
|
|
return pos;
|
|
}
|
|
|
|
return -ENOENT;
|
|
}
|
|
|
|
/**
|
|
* pci_rebar_get_possible_sizes - get possible sizes for BAR
|
|
* @pdev: PCI device
|
|
* @bar: BAR to query
|
|
*
|
|
* Get the possible sizes of a resizable BAR as bitmask defined in the spec
|
|
* (bit 0=1MB, bit 19=512GB). Returns 0 if BAR isn't resizable.
|
|
*/
|
|
u32 pci_rebar_get_possible_sizes(struct pci_dev *pdev, int bar)
|
|
{
|
|
int pos;
|
|
u32 cap;
|
|
|
|
pos = pci_rebar_find_pos(pdev, bar);
|
|
if (pos < 0)
|
|
return 0;
|
|
|
|
pci_read_config_dword(pdev, pos + PCI_REBAR_CAP, &cap);
|
|
cap &= PCI_REBAR_CAP_SIZES;
|
|
|
|
/* Sapphire RX 5600 XT Pulse has an invalid cap dword for BAR 0 */
|
|
if (pdev->vendor == PCI_VENDOR_ID_ATI && pdev->device == 0x731f &&
|
|
bar == 0 && cap == 0x7000)
|
|
cap = 0x3f000;
|
|
|
|
return cap >> 4;
|
|
}
|
|
EXPORT_SYMBOL(pci_rebar_get_possible_sizes);
|
|
|
|
/**
|
|
* pci_rebar_get_current_size - get the current size of a BAR
|
|
* @pdev: PCI device
|
|
* @bar: BAR to set size to
|
|
*
|
|
* Read the size of a BAR from the resizable BAR config.
|
|
* Returns size if found or negative error code.
|
|
*/
|
|
int pci_rebar_get_current_size(struct pci_dev *pdev, int bar)
|
|
{
|
|
int pos;
|
|
u32 ctrl;
|
|
|
|
pos = pci_rebar_find_pos(pdev, bar);
|
|
if (pos < 0)
|
|
return pos;
|
|
|
|
pci_read_config_dword(pdev, pos + PCI_REBAR_CTRL, &ctrl);
|
|
return (ctrl & PCI_REBAR_CTRL_BAR_SIZE) >> PCI_REBAR_CTRL_BAR_SHIFT;
|
|
}
|
|
|
|
/**
|
|
* pci_rebar_set_size - set a new size for a BAR
|
|
* @pdev: PCI device
|
|
* @bar: BAR to set size to
|
|
* @size: new size as defined in the spec (0=1MB, 19=512GB)
|
|
*
|
|
* Set the new size of a BAR as defined in the spec.
|
|
* Returns zero if resizing was successful, error code otherwise.
|
|
*/
|
|
int pci_rebar_set_size(struct pci_dev *pdev, int bar, int size)
|
|
{
|
|
int pos;
|
|
u32 ctrl;
|
|
|
|
pos = pci_rebar_find_pos(pdev, bar);
|
|
if (pos < 0)
|
|
return pos;
|
|
|
|
pci_read_config_dword(pdev, pos + PCI_REBAR_CTRL, &ctrl);
|
|
ctrl &= ~PCI_REBAR_CTRL_BAR_SIZE;
|
|
ctrl |= size << PCI_REBAR_CTRL_BAR_SHIFT;
|
|
pci_write_config_dword(pdev, pos + PCI_REBAR_CTRL, ctrl);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pci_enable_atomic_ops_to_root - enable AtomicOp requests to root port
|
|
* @dev: the PCI device
|
|
* @cap_mask: mask of desired AtomicOp sizes, including one or more of:
|
|
* PCI_EXP_DEVCAP2_ATOMIC_COMP32
|
|
* PCI_EXP_DEVCAP2_ATOMIC_COMP64
|
|
* PCI_EXP_DEVCAP2_ATOMIC_COMP128
|
|
*
|
|
* Return 0 if all upstream bridges support AtomicOp routing, egress
|
|
* blocking is disabled on all upstream ports, and the root port supports
|
|
* the requested completion capabilities (32-bit, 64-bit and/or 128-bit
|
|
* AtomicOp completion), or negative otherwise.
|
|
*/
|
|
int pci_enable_atomic_ops_to_root(struct pci_dev *dev, u32 cap_mask)
|
|
{
|
|
struct pci_bus *bus = dev->bus;
|
|
struct pci_dev *bridge;
|
|
u32 cap, ctl2;
|
|
|
|
/*
|
|
* Per PCIe r5.0, sec 9.3.5.10, the AtomicOp Requester Enable bit
|
|
* in Device Control 2 is reserved in VFs and the PF value applies
|
|
* to all associated VFs.
|
|
*/
|
|
if (dev->is_virtfn)
|
|
return -EINVAL;
|
|
|
|
if (!pci_is_pcie(dev))
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* Per PCIe r4.0, sec 6.15, endpoints and root ports may be
|
|
* AtomicOp requesters. For now, we only support endpoints as
|
|
* requesters and root ports as completers. No endpoints as
|
|
* completers, and no peer-to-peer.
|
|
*/
|
|
|
|
switch (pci_pcie_type(dev)) {
|
|
case PCI_EXP_TYPE_ENDPOINT:
|
|
case PCI_EXP_TYPE_LEG_END:
|
|
case PCI_EXP_TYPE_RC_END:
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
while (bus->parent) {
|
|
bridge = bus->self;
|
|
|
|
pcie_capability_read_dword(bridge, PCI_EXP_DEVCAP2, &cap);
|
|
|
|
switch (pci_pcie_type(bridge)) {
|
|
/* Ensure switch ports support AtomicOp routing */
|
|
case PCI_EXP_TYPE_UPSTREAM:
|
|
case PCI_EXP_TYPE_DOWNSTREAM:
|
|
if (!(cap & PCI_EXP_DEVCAP2_ATOMIC_ROUTE))
|
|
return -EINVAL;
|
|
break;
|
|
|
|
/* Ensure root port supports all the sizes we care about */
|
|
case PCI_EXP_TYPE_ROOT_PORT:
|
|
if ((cap & cap_mask) != cap_mask)
|
|
return -EINVAL;
|
|
break;
|
|
}
|
|
|
|
/* Ensure upstream ports don't block AtomicOps on egress */
|
|
if (pci_pcie_type(bridge) == PCI_EXP_TYPE_UPSTREAM) {
|
|
pcie_capability_read_dword(bridge, PCI_EXP_DEVCTL2,
|
|
&ctl2);
|
|
if (ctl2 & PCI_EXP_DEVCTL2_ATOMIC_EGRESS_BLOCK)
|
|
return -EINVAL;
|
|
}
|
|
|
|
bus = bus->parent;
|
|
}
|
|
|
|
pcie_capability_set_word(dev, PCI_EXP_DEVCTL2,
|
|
PCI_EXP_DEVCTL2_ATOMIC_REQ);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(pci_enable_atomic_ops_to_root);
|
|
|
|
/**
|
|
* pci_swizzle_interrupt_pin - swizzle INTx for device behind bridge
|
|
* @dev: the PCI device
|
|
* @pin: the INTx pin (1=INTA, 2=INTB, 3=INTC, 4=INTD)
|
|
*
|
|
* Perform INTx swizzling for a device behind one level of bridge. This is
|
|
* required by section 9.1 of the PCI-to-PCI bridge specification for devices
|
|
* behind bridges on add-in cards. For devices with ARI enabled, the slot
|
|
* number is always 0 (see the Implementation Note in section 2.2.8.1 of
|
|
* the PCI Express Base Specification, Revision 2.1)
|
|
*/
|
|
u8 pci_swizzle_interrupt_pin(const struct pci_dev *dev, u8 pin)
|
|
{
|
|
int slot;
|
|
|
|
if (pci_ari_enabled(dev->bus))
|
|
slot = 0;
|
|
else
|
|
slot = PCI_SLOT(dev->devfn);
|
|
|
|
return (((pin - 1) + slot) % 4) + 1;
|
|
}
|
|
|
|
int pci_get_interrupt_pin(struct pci_dev *dev, struct pci_dev **bridge)
|
|
{
|
|
u8 pin;
|
|
|
|
pin = dev->pin;
|
|
if (!pin)
|
|
return -1;
|
|
|
|
while (!pci_is_root_bus(dev->bus)) {
|
|
pin = pci_swizzle_interrupt_pin(dev, pin);
|
|
dev = dev->bus->self;
|
|
}
|
|
*bridge = dev;
|
|
return pin;
|
|
}
|
|
|
|
/**
|
|
* pci_common_swizzle - swizzle INTx all the way to root bridge
|
|
* @dev: the PCI device
|
|
* @pinp: pointer to the INTx pin value (1=INTA, 2=INTB, 3=INTD, 4=INTD)
|
|
*
|
|
* Perform INTx swizzling for a device. This traverses through all PCI-to-PCI
|
|
* bridges all the way up to a PCI root bus.
|
|
*/
|
|
u8 pci_common_swizzle(struct pci_dev *dev, u8 *pinp)
|
|
{
|
|
u8 pin = *pinp;
|
|
|
|
while (!pci_is_root_bus(dev->bus)) {
|
|
pin = pci_swizzle_interrupt_pin(dev, pin);
|
|
dev = dev->bus->self;
|
|
}
|
|
*pinp = pin;
|
|
return PCI_SLOT(dev->devfn);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_common_swizzle);
|
|
|
|
/**
|
|
* pci_release_region - Release a PCI bar
|
|
* @pdev: PCI device whose resources were previously reserved by
|
|
* pci_request_region()
|
|
* @bar: BAR to release
|
|
*
|
|
* Releases the PCI I/O and memory resources previously reserved by a
|
|
* successful call to pci_request_region(). Call this function only
|
|
* after all use of the PCI regions has ceased.
|
|
*/
|
|
void pci_release_region(struct pci_dev *pdev, int bar)
|
|
{
|
|
struct pci_devres *dr;
|
|
|
|
if (pci_resource_len(pdev, bar) == 0)
|
|
return;
|
|
if (pci_resource_flags(pdev, bar) & IORESOURCE_IO)
|
|
release_region(pci_resource_start(pdev, bar),
|
|
pci_resource_len(pdev, bar));
|
|
else if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM)
|
|
release_mem_region(pci_resource_start(pdev, bar),
|
|
pci_resource_len(pdev, bar));
|
|
|
|
dr = find_pci_dr(pdev);
|
|
if (dr)
|
|
dr->region_mask &= ~(1 << bar);
|
|
}
|
|
EXPORT_SYMBOL(pci_release_region);
|
|
|
|
/**
|
|
* __pci_request_region - Reserved PCI I/O and memory resource
|
|
* @pdev: PCI device whose resources are to be reserved
|
|
* @bar: BAR to be reserved
|
|
* @res_name: Name to be associated with resource.
|
|
* @exclusive: whether the region access is exclusive or not
|
|
*
|
|
* Mark the PCI region associated with PCI device @pdev BAR @bar as
|
|
* being reserved by owner @res_name. Do not access any
|
|
* address inside the PCI regions unless this call returns
|
|
* successfully.
|
|
*
|
|
* If @exclusive is set, then the region is marked so that userspace
|
|
* is explicitly not allowed to map the resource via /dev/mem or
|
|
* sysfs MMIO access.
|
|
*
|
|
* Returns 0 on success, or %EBUSY on error. A warning
|
|
* message is also printed on failure.
|
|
*/
|
|
static int __pci_request_region(struct pci_dev *pdev, int bar,
|
|
const char *res_name, int exclusive)
|
|
{
|
|
struct pci_devres *dr;
|
|
|
|
if (pci_resource_len(pdev, bar) == 0)
|
|
return 0;
|
|
|
|
if (pci_resource_flags(pdev, bar) & IORESOURCE_IO) {
|
|
if (!request_region(pci_resource_start(pdev, bar),
|
|
pci_resource_len(pdev, bar), res_name))
|
|
goto err_out;
|
|
} else if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM) {
|
|
if (!__request_mem_region(pci_resource_start(pdev, bar),
|
|
pci_resource_len(pdev, bar), res_name,
|
|
exclusive))
|
|
goto err_out;
|
|
}
|
|
|
|
dr = find_pci_dr(pdev);
|
|
if (dr)
|
|
dr->region_mask |= 1 << bar;
|
|
|
|
return 0;
|
|
|
|
err_out:
|
|
pci_warn(pdev, "BAR %d: can't reserve %pR\n", bar,
|
|
&pdev->resource[bar]);
|
|
return -EBUSY;
|
|
}
|
|
|
|
/**
|
|
* pci_request_region - Reserve PCI I/O and memory resource
|
|
* @pdev: PCI device whose resources are to be reserved
|
|
* @bar: BAR to be reserved
|
|
* @res_name: Name to be associated with resource
|
|
*
|
|
* Mark the PCI region associated with PCI device @pdev BAR @bar as
|
|
* being reserved by owner @res_name. Do not access any
|
|
* address inside the PCI regions unless this call returns
|
|
* successfully.
|
|
*
|
|
* Returns 0 on success, or %EBUSY on error. A warning
|
|
* message is also printed on failure.
|
|
*/
|
|
int pci_request_region(struct pci_dev *pdev, int bar, const char *res_name)
|
|
{
|
|
return __pci_request_region(pdev, bar, res_name, 0);
|
|
}
|
|
EXPORT_SYMBOL(pci_request_region);
|
|
|
|
/**
|
|
* pci_release_selected_regions - Release selected PCI I/O and memory resources
|
|
* @pdev: PCI device whose resources were previously reserved
|
|
* @bars: Bitmask of BARs to be released
|
|
*
|
|
* Release selected PCI I/O and memory resources previously reserved.
|
|
* Call this function only after all use of the PCI regions has ceased.
|
|
*/
|
|
void pci_release_selected_regions(struct pci_dev *pdev, int bars)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < PCI_STD_NUM_BARS; i++)
|
|
if (bars & (1 << i))
|
|
pci_release_region(pdev, i);
|
|
}
|
|
EXPORT_SYMBOL(pci_release_selected_regions);
|
|
|
|
static int __pci_request_selected_regions(struct pci_dev *pdev, int bars,
|
|
const char *res_name, int excl)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < PCI_STD_NUM_BARS; i++)
|
|
if (bars & (1 << i))
|
|
if (__pci_request_region(pdev, i, res_name, excl))
|
|
goto err_out;
|
|
return 0;
|
|
|
|
err_out:
|
|
while (--i >= 0)
|
|
if (bars & (1 << i))
|
|
pci_release_region(pdev, i);
|
|
|
|
return -EBUSY;
|
|
}
|
|
|
|
|
|
/**
|
|
* pci_request_selected_regions - Reserve selected PCI I/O and memory resources
|
|
* @pdev: PCI device whose resources are to be reserved
|
|
* @bars: Bitmask of BARs to be requested
|
|
* @res_name: Name to be associated with resource
|
|
*/
|
|
int pci_request_selected_regions(struct pci_dev *pdev, int bars,
|
|
const char *res_name)
|
|
{
|
|
return __pci_request_selected_regions(pdev, bars, res_name, 0);
|
|
}
|
|
EXPORT_SYMBOL(pci_request_selected_regions);
|
|
|
|
int pci_request_selected_regions_exclusive(struct pci_dev *pdev, int bars,
|
|
const char *res_name)
|
|
{
|
|
return __pci_request_selected_regions(pdev, bars, res_name,
|
|
IORESOURCE_EXCLUSIVE);
|
|
}
|
|
EXPORT_SYMBOL(pci_request_selected_regions_exclusive);
|
|
|
|
/**
|
|
* pci_release_regions - Release reserved PCI I/O and memory resources
|
|
* @pdev: PCI device whose resources were previously reserved by
|
|
* pci_request_regions()
|
|
*
|
|
* Releases all PCI I/O and memory resources previously reserved by a
|
|
* successful call to pci_request_regions(). Call this function only
|
|
* after all use of the PCI regions has ceased.
|
|
*/
|
|
|
|
void pci_release_regions(struct pci_dev *pdev)
|
|
{
|
|
pci_release_selected_regions(pdev, (1 << PCI_STD_NUM_BARS) - 1);
|
|
}
|
|
EXPORT_SYMBOL(pci_release_regions);
|
|
|
|
/**
|
|
* pci_request_regions - Reserve PCI I/O and memory resources
|
|
* @pdev: PCI device whose resources are to be reserved
|
|
* @res_name: Name to be associated with resource.
|
|
*
|
|
* Mark all PCI regions associated with PCI device @pdev as
|
|
* being reserved by owner @res_name. Do not access any
|
|
* address inside the PCI regions unless this call returns
|
|
* successfully.
|
|
*
|
|
* Returns 0 on success, or %EBUSY on error. A warning
|
|
* message is also printed on failure.
|
|
*/
|
|
int pci_request_regions(struct pci_dev *pdev, const char *res_name)
|
|
{
|
|
return pci_request_selected_regions(pdev,
|
|
((1 << PCI_STD_NUM_BARS) - 1), res_name);
|
|
}
|
|
EXPORT_SYMBOL(pci_request_regions);
|
|
|
|
/**
|
|
* pci_request_regions_exclusive - Reserve PCI I/O and memory resources
|
|
* @pdev: PCI device whose resources are to be reserved
|
|
* @res_name: Name to be associated with resource.
|
|
*
|
|
* Mark all PCI regions associated with PCI device @pdev as being reserved
|
|
* by owner @res_name. Do not access any address inside the PCI regions
|
|
* unless this call returns successfully.
|
|
*
|
|
* pci_request_regions_exclusive() will mark the region so that /dev/mem
|
|
* and the sysfs MMIO access will not be allowed.
|
|
*
|
|
* Returns 0 on success, or %EBUSY on error. A warning message is also
|
|
* printed on failure.
|
|
*/
|
|
int pci_request_regions_exclusive(struct pci_dev *pdev, const char *res_name)
|
|
{
|
|
return pci_request_selected_regions_exclusive(pdev,
|
|
((1 << PCI_STD_NUM_BARS) - 1), res_name);
|
|
}
|
|
EXPORT_SYMBOL(pci_request_regions_exclusive);
|
|
|
|
/*
|
|
* Record the PCI IO range (expressed as CPU physical address + size).
|
|
* Return a negative value if an error has occurred, zero otherwise
|
|
*/
|
|
int pci_register_io_range(struct fwnode_handle *fwnode, phys_addr_t addr,
|
|
resource_size_t size)
|
|
{
|
|
int ret = 0;
|
|
#ifdef PCI_IOBASE
|
|
struct logic_pio_hwaddr *range;
|
|
|
|
if (!size || addr + size < addr)
|
|
return -EINVAL;
|
|
|
|
range = kzalloc(sizeof(*range), GFP_ATOMIC);
|
|
if (!range)
|
|
return -ENOMEM;
|
|
|
|
range->fwnode = fwnode;
|
|
range->size = size;
|
|
range->hw_start = addr;
|
|
range->flags = LOGIC_PIO_CPU_MMIO;
|
|
|
|
ret = logic_pio_register_range(range);
|
|
if (ret)
|
|
kfree(range);
|
|
|
|
/* Ignore duplicates due to deferred probing */
|
|
if (ret == -EEXIST)
|
|
ret = 0;
|
|
#endif
|
|
|
|
return ret;
|
|
}
|
|
|
|
phys_addr_t pci_pio_to_address(unsigned long pio)
|
|
{
|
|
phys_addr_t address = (phys_addr_t)OF_BAD_ADDR;
|
|
|
|
#ifdef PCI_IOBASE
|
|
if (pio >= MMIO_UPPER_LIMIT)
|
|
return address;
|
|
|
|
address = logic_pio_to_hwaddr(pio);
|
|
#endif
|
|
|
|
return address;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_pio_to_address);
|
|
|
|
unsigned long __weak pci_address_to_pio(phys_addr_t address)
|
|
{
|
|
#ifdef PCI_IOBASE
|
|
return logic_pio_trans_cpuaddr(address);
|
|
#else
|
|
if (address > IO_SPACE_LIMIT)
|
|
return (unsigned long)-1;
|
|
|
|
return (unsigned long) address;
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* pci_remap_iospace - Remap the memory mapped I/O space
|
|
* @res: Resource describing the I/O space
|
|
* @phys_addr: physical address of range to be mapped
|
|
*
|
|
* Remap the memory mapped I/O space described by the @res and the CPU
|
|
* physical address @phys_addr into virtual address space. Only
|
|
* architectures that have memory mapped IO functions defined (and the
|
|
* PCI_IOBASE value defined) should call this function.
|
|
*/
|
|
#ifndef pci_remap_iospace
|
|
int pci_remap_iospace(const struct resource *res, phys_addr_t phys_addr)
|
|
{
|
|
#if defined(PCI_IOBASE) && defined(CONFIG_MMU)
|
|
unsigned long vaddr = (unsigned long)PCI_IOBASE + res->start;
|
|
|
|
if (!(res->flags & IORESOURCE_IO))
|
|
return -EINVAL;
|
|
|
|
if (res->end > IO_SPACE_LIMIT)
|
|
return -EINVAL;
|
|
|
|
return ioremap_page_range(vaddr, vaddr + resource_size(res), phys_addr,
|
|
pgprot_device(PAGE_KERNEL));
|
|
#else
|
|
/*
|
|
* This architecture does not have memory mapped I/O space,
|
|
* so this function should never be called
|
|
*/
|
|
WARN_ONCE(1, "This architecture does not support memory mapped I/O\n");
|
|
return -ENODEV;
|
|
#endif
|
|
}
|
|
EXPORT_SYMBOL(pci_remap_iospace);
|
|
#endif
|
|
|
|
/**
|
|
* pci_unmap_iospace - Unmap the memory mapped I/O space
|
|
* @res: resource to be unmapped
|
|
*
|
|
* Unmap the CPU virtual address @res from virtual address space. Only
|
|
* architectures that have memory mapped IO functions defined (and the
|
|
* PCI_IOBASE value defined) should call this function.
|
|
*/
|
|
void pci_unmap_iospace(struct resource *res)
|
|
{
|
|
#if defined(PCI_IOBASE) && defined(CONFIG_MMU)
|
|
unsigned long vaddr = (unsigned long)PCI_IOBASE + res->start;
|
|
|
|
vunmap_range(vaddr, vaddr + resource_size(res));
|
|
#endif
|
|
}
|
|
EXPORT_SYMBOL(pci_unmap_iospace);
|
|
|
|
static void devm_pci_unmap_iospace(struct device *dev, void *ptr)
|
|
{
|
|
struct resource **res = ptr;
|
|
|
|
pci_unmap_iospace(*res);
|
|
}
|
|
|
|
/**
|
|
* devm_pci_remap_iospace - Managed pci_remap_iospace()
|
|
* @dev: Generic device to remap IO address for
|
|
* @res: Resource describing the I/O space
|
|
* @phys_addr: physical address of range to be mapped
|
|
*
|
|
* Managed pci_remap_iospace(). Map is automatically unmapped on driver
|
|
* detach.
|
|
*/
|
|
int devm_pci_remap_iospace(struct device *dev, const struct resource *res,
|
|
phys_addr_t phys_addr)
|
|
{
|
|
const struct resource **ptr;
|
|
int error;
|
|
|
|
ptr = devres_alloc(devm_pci_unmap_iospace, sizeof(*ptr), GFP_KERNEL);
|
|
if (!ptr)
|
|
return -ENOMEM;
|
|
|
|
error = pci_remap_iospace(res, phys_addr);
|
|
if (error) {
|
|
devres_free(ptr);
|
|
} else {
|
|
*ptr = res;
|
|
devres_add(dev, ptr);
|
|
}
|
|
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL(devm_pci_remap_iospace);
|
|
|
|
/**
|
|
* devm_pci_remap_cfgspace - Managed pci_remap_cfgspace()
|
|
* @dev: Generic device to remap IO address for
|
|
* @offset: Resource address to map
|
|
* @size: Size of map
|
|
*
|
|
* Managed pci_remap_cfgspace(). Map is automatically unmapped on driver
|
|
* detach.
|
|
*/
|
|
void __iomem *devm_pci_remap_cfgspace(struct device *dev,
|
|
resource_size_t offset,
|
|
resource_size_t size)
|
|
{
|
|
void __iomem **ptr, *addr;
|
|
|
|
ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
|
|
if (!ptr)
|
|
return NULL;
|
|
|
|
addr = pci_remap_cfgspace(offset, size);
|
|
if (addr) {
|
|
*ptr = addr;
|
|
devres_add(dev, ptr);
|
|
} else
|
|
devres_free(ptr);
|
|
|
|
return addr;
|
|
}
|
|
EXPORT_SYMBOL(devm_pci_remap_cfgspace);
|
|
|
|
/**
|
|
* devm_pci_remap_cfg_resource - check, request region and ioremap cfg resource
|
|
* @dev: generic device to handle the resource for
|
|
* @res: configuration space resource to be handled
|
|
*
|
|
* Checks that a resource is a valid memory region, requests the memory
|
|
* region and ioremaps with pci_remap_cfgspace() API that ensures the
|
|
* proper PCI configuration space memory attributes are guaranteed.
|
|
*
|
|
* All operations are managed and will be undone on driver detach.
|
|
*
|
|
* Returns a pointer to the remapped memory or an ERR_PTR() encoded error code
|
|
* on failure. Usage example::
|
|
*
|
|
* res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
* base = devm_pci_remap_cfg_resource(&pdev->dev, res);
|
|
* if (IS_ERR(base))
|
|
* return PTR_ERR(base);
|
|
*/
|
|
void __iomem *devm_pci_remap_cfg_resource(struct device *dev,
|
|
struct resource *res)
|
|
{
|
|
resource_size_t size;
|
|
const char *name;
|
|
void __iomem *dest_ptr;
|
|
|
|
BUG_ON(!dev);
|
|
|
|
if (!res || resource_type(res) != IORESOURCE_MEM) {
|
|
dev_err(dev, "invalid resource\n");
|
|
return IOMEM_ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
size = resource_size(res);
|
|
|
|
if (res->name)
|
|
name = devm_kasprintf(dev, GFP_KERNEL, "%s %s", dev_name(dev),
|
|
res->name);
|
|
else
|
|
name = devm_kstrdup(dev, dev_name(dev), GFP_KERNEL);
|
|
if (!name)
|
|
return IOMEM_ERR_PTR(-ENOMEM);
|
|
|
|
if (!devm_request_mem_region(dev, res->start, size, name)) {
|
|
dev_err(dev, "can't request region for resource %pR\n", res);
|
|
return IOMEM_ERR_PTR(-EBUSY);
|
|
}
|
|
|
|
dest_ptr = devm_pci_remap_cfgspace(dev, res->start, size);
|
|
if (!dest_ptr) {
|
|
dev_err(dev, "ioremap failed for resource %pR\n", res);
|
|
devm_release_mem_region(dev, res->start, size);
|
|
dest_ptr = IOMEM_ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
return dest_ptr;
|
|
}
|
|
EXPORT_SYMBOL(devm_pci_remap_cfg_resource);
|
|
|
|
static void __pci_set_master(struct pci_dev *dev, bool enable)
|
|
{
|
|
u16 old_cmd, cmd;
|
|
|
|
pci_read_config_word(dev, PCI_COMMAND, &old_cmd);
|
|
if (enable)
|
|
cmd = old_cmd | PCI_COMMAND_MASTER;
|
|
else
|
|
cmd = old_cmd & ~PCI_COMMAND_MASTER;
|
|
if (cmd != old_cmd) {
|
|
pci_dbg(dev, "%s bus mastering\n",
|
|
enable ? "enabling" : "disabling");
|
|
pci_write_config_word(dev, PCI_COMMAND, cmd);
|
|
}
|
|
dev->is_busmaster = enable;
|
|
}
|
|
|
|
/**
|
|
* pcibios_setup - process "pci=" kernel boot arguments
|
|
* @str: string used to pass in "pci=" kernel boot arguments
|
|
*
|
|
* Process kernel boot arguments. This is the default implementation.
|
|
* Architecture specific implementations can override this as necessary.
|
|
*/
|
|
char * __weak __init pcibios_setup(char *str)
|
|
{
|
|
return str;
|
|
}
|
|
|
|
/**
|
|
* pcibios_set_master - enable PCI bus-mastering for device dev
|
|
* @dev: the PCI device to enable
|
|
*
|
|
* Enables PCI bus-mastering for the device. This is the default
|
|
* implementation. Architecture specific implementations can override
|
|
* this if necessary.
|
|
*/
|
|
void __weak pcibios_set_master(struct pci_dev *dev)
|
|
{
|
|
u8 lat;
|
|
|
|
/* The latency timer doesn't apply to PCIe (either Type 0 or Type 1) */
|
|
if (pci_is_pcie(dev))
|
|
return;
|
|
|
|
pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
|
|
if (lat < 16)
|
|
lat = (64 <= pcibios_max_latency) ? 64 : pcibios_max_latency;
|
|
else if (lat > pcibios_max_latency)
|
|
lat = pcibios_max_latency;
|
|
else
|
|
return;
|
|
|
|
pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat);
|
|
}
|
|
|
|
/**
|
|
* pci_set_master - enables bus-mastering for device dev
|
|
* @dev: the PCI device to enable
|
|
*
|
|
* Enables bus-mastering on the device and calls pcibios_set_master()
|
|
* to do the needed arch specific settings.
|
|
*/
|
|
void pci_set_master(struct pci_dev *dev)
|
|
{
|
|
__pci_set_master(dev, true);
|
|
pcibios_set_master(dev);
|
|
}
|
|
EXPORT_SYMBOL(pci_set_master);
|
|
|
|
/**
|
|
* pci_clear_master - disables bus-mastering for device dev
|
|
* @dev: the PCI device to disable
|
|
*/
|
|
void pci_clear_master(struct pci_dev *dev)
|
|
{
|
|
__pci_set_master(dev, false);
|
|
}
|
|
EXPORT_SYMBOL(pci_clear_master);
|
|
|
|
/**
|
|
* pci_set_cacheline_size - ensure the CACHE_LINE_SIZE register is programmed
|
|
* @dev: the PCI device for which MWI is to be enabled
|
|
*
|
|
* Helper function for pci_set_mwi.
|
|
* Originally copied from drivers/net/acenic.c.
|
|
* Copyright 1998-2001 by Jes Sorensen, <jes@trained-monkey.org>.
|
|
*
|
|
* RETURNS: An appropriate -ERRNO error value on error, or zero for success.
|
|
*/
|
|
int pci_set_cacheline_size(struct pci_dev *dev)
|
|
{
|
|
u8 cacheline_size;
|
|
|
|
if (!pci_cache_line_size)
|
|
return -EINVAL;
|
|
|
|
/* Validate current setting: the PCI_CACHE_LINE_SIZE must be
|
|
equal to or multiple of the right value. */
|
|
pci_read_config_byte(dev, PCI_CACHE_LINE_SIZE, &cacheline_size);
|
|
if (cacheline_size >= pci_cache_line_size &&
|
|
(cacheline_size % pci_cache_line_size) == 0)
|
|
return 0;
|
|
|
|
/* Write the correct value. */
|
|
pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, pci_cache_line_size);
|
|
/* Read it back. */
|
|
pci_read_config_byte(dev, PCI_CACHE_LINE_SIZE, &cacheline_size);
|
|
if (cacheline_size == pci_cache_line_size)
|
|
return 0;
|
|
|
|
pci_dbg(dev, "cache line size of %d is not supported\n",
|
|
pci_cache_line_size << 2);
|
|
|
|
return -EINVAL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_set_cacheline_size);
|
|
|
|
/**
|
|
* pci_set_mwi - enables memory-write-invalidate PCI transaction
|
|
* @dev: the PCI device for which MWI is enabled
|
|
*
|
|
* Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND.
|
|
*
|
|
* RETURNS: An appropriate -ERRNO error value on error, or zero for success.
|
|
*/
|
|
int pci_set_mwi(struct pci_dev *dev)
|
|
{
|
|
#ifdef PCI_DISABLE_MWI
|
|
return 0;
|
|
#else
|
|
int rc;
|
|
u16 cmd;
|
|
|
|
rc = pci_set_cacheline_size(dev);
|
|
if (rc)
|
|
return rc;
|
|
|
|
pci_read_config_word(dev, PCI_COMMAND, &cmd);
|
|
if (!(cmd & PCI_COMMAND_INVALIDATE)) {
|
|
pci_dbg(dev, "enabling Mem-Wr-Inval\n");
|
|
cmd |= PCI_COMMAND_INVALIDATE;
|
|
pci_write_config_word(dev, PCI_COMMAND, cmd);
|
|
}
|
|
return 0;
|
|
#endif
|
|
}
|
|
EXPORT_SYMBOL(pci_set_mwi);
|
|
|
|
/**
|
|
* pcim_set_mwi - a device-managed pci_set_mwi()
|
|
* @dev: the PCI device for which MWI is enabled
|
|
*
|
|
* Managed pci_set_mwi().
|
|
*
|
|
* RETURNS: An appropriate -ERRNO error value on error, or zero for success.
|
|
*/
|
|
int pcim_set_mwi(struct pci_dev *dev)
|
|
{
|
|
struct pci_devres *dr;
|
|
|
|
dr = find_pci_dr(dev);
|
|
if (!dr)
|
|
return -ENOMEM;
|
|
|
|
dr->mwi = 1;
|
|
return pci_set_mwi(dev);
|
|
}
|
|
EXPORT_SYMBOL(pcim_set_mwi);
|
|
|
|
/**
|
|
* pci_try_set_mwi - enables memory-write-invalidate PCI transaction
|
|
* @dev: the PCI device for which MWI is enabled
|
|
*
|
|
* Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND.
|
|
* Callers are not required to check the return value.
|
|
*
|
|
* RETURNS: An appropriate -ERRNO error value on error, or zero for success.
|
|
*/
|
|
int pci_try_set_mwi(struct pci_dev *dev)
|
|
{
|
|
#ifdef PCI_DISABLE_MWI
|
|
return 0;
|
|
#else
|
|
return pci_set_mwi(dev);
|
|
#endif
|
|
}
|
|
EXPORT_SYMBOL(pci_try_set_mwi);
|
|
|
|
/**
|
|
* pci_clear_mwi - disables Memory-Write-Invalidate for device dev
|
|
* @dev: the PCI device to disable
|
|
*
|
|
* Disables PCI Memory-Write-Invalidate transaction on the device
|
|
*/
|
|
void pci_clear_mwi(struct pci_dev *dev)
|
|
{
|
|
#ifndef PCI_DISABLE_MWI
|
|
u16 cmd;
|
|
|
|
pci_read_config_word(dev, PCI_COMMAND, &cmd);
|
|
if (cmd & PCI_COMMAND_INVALIDATE) {
|
|
cmd &= ~PCI_COMMAND_INVALIDATE;
|
|
pci_write_config_word(dev, PCI_COMMAND, cmd);
|
|
}
|
|
#endif
|
|
}
|
|
EXPORT_SYMBOL(pci_clear_mwi);
|
|
|
|
/**
|
|
* pci_disable_parity - disable parity checking for device
|
|
* @dev: the PCI device to operate on
|
|
*
|
|
* Disable parity checking for device @dev
|
|
*/
|
|
void pci_disable_parity(struct pci_dev *dev)
|
|
{
|
|
u16 cmd;
|
|
|
|
pci_read_config_word(dev, PCI_COMMAND, &cmd);
|
|
if (cmd & PCI_COMMAND_PARITY) {
|
|
cmd &= ~PCI_COMMAND_PARITY;
|
|
pci_write_config_word(dev, PCI_COMMAND, cmd);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* pci_intx - enables/disables PCI INTx for device dev
|
|
* @pdev: the PCI device to operate on
|
|
* @enable: boolean: whether to enable or disable PCI INTx
|
|
*
|
|
* Enables/disables PCI INTx for device @pdev
|
|
*/
|
|
void pci_intx(struct pci_dev *pdev, int enable)
|
|
{
|
|
u16 pci_command, new;
|
|
|
|
pci_read_config_word(pdev, PCI_COMMAND, &pci_command);
|
|
|
|
if (enable)
|
|
new = pci_command & ~PCI_COMMAND_INTX_DISABLE;
|
|
else
|
|
new = pci_command | PCI_COMMAND_INTX_DISABLE;
|
|
|
|
if (new != pci_command) {
|
|
struct pci_devres *dr;
|
|
|
|
pci_write_config_word(pdev, PCI_COMMAND, new);
|
|
|
|
dr = find_pci_dr(pdev);
|
|
if (dr && !dr->restore_intx) {
|
|
dr->restore_intx = 1;
|
|
dr->orig_intx = !enable;
|
|
}
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_intx);
|
|
|
|
static bool pci_check_and_set_intx_mask(struct pci_dev *dev, bool mask)
|
|
{
|
|
struct pci_bus *bus = dev->bus;
|
|
bool mask_updated = true;
|
|
u32 cmd_status_dword;
|
|
u16 origcmd, newcmd;
|
|
unsigned long flags;
|
|
bool irq_pending;
|
|
|
|
/*
|
|
* We do a single dword read to retrieve both command and status.
|
|
* Document assumptions that make this possible.
|
|
*/
|
|
BUILD_BUG_ON(PCI_COMMAND % 4);
|
|
BUILD_BUG_ON(PCI_COMMAND + 2 != PCI_STATUS);
|
|
|
|
raw_spin_lock_irqsave(&pci_lock, flags);
|
|
|
|
bus->ops->read(bus, dev->devfn, PCI_COMMAND, 4, &cmd_status_dword);
|
|
|
|
irq_pending = (cmd_status_dword >> 16) & PCI_STATUS_INTERRUPT;
|
|
|
|
/*
|
|
* Check interrupt status register to see whether our device
|
|
* triggered the interrupt (when masking) or the next IRQ is
|
|
* already pending (when unmasking).
|
|
*/
|
|
if (mask != irq_pending) {
|
|
mask_updated = false;
|
|
goto done;
|
|
}
|
|
|
|
origcmd = cmd_status_dword;
|
|
newcmd = origcmd & ~PCI_COMMAND_INTX_DISABLE;
|
|
if (mask)
|
|
newcmd |= PCI_COMMAND_INTX_DISABLE;
|
|
if (newcmd != origcmd)
|
|
bus->ops->write(bus, dev->devfn, PCI_COMMAND, 2, newcmd);
|
|
|
|
done:
|
|
raw_spin_unlock_irqrestore(&pci_lock, flags);
|
|
|
|
return mask_updated;
|
|
}
|
|
|
|
/**
|
|
* pci_check_and_mask_intx - mask INTx on pending interrupt
|
|
* @dev: the PCI device to operate on
|
|
*
|
|
* Check if the device dev has its INTx line asserted, mask it and return
|
|
* true in that case. False is returned if no interrupt was pending.
|
|
*/
|
|
bool pci_check_and_mask_intx(struct pci_dev *dev)
|
|
{
|
|
return pci_check_and_set_intx_mask(dev, true);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_check_and_mask_intx);
|
|
|
|
/**
|
|
* pci_check_and_unmask_intx - unmask INTx if no interrupt is pending
|
|
* @dev: the PCI device to operate on
|
|
*
|
|
* Check if the device dev has its INTx line asserted, unmask it if not and
|
|
* return true. False is returned and the mask remains active if there was
|
|
* still an interrupt pending.
|
|
*/
|
|
bool pci_check_and_unmask_intx(struct pci_dev *dev)
|
|
{
|
|
return pci_check_and_set_intx_mask(dev, false);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_check_and_unmask_intx);
|
|
|
|
/**
|
|
* pci_wait_for_pending_transaction - wait for pending transaction
|
|
* @dev: the PCI device to operate on
|
|
*
|
|
* Return 0 if transaction is pending 1 otherwise.
|
|
*/
|
|
int pci_wait_for_pending_transaction(struct pci_dev *dev)
|
|
{
|
|
if (!pci_is_pcie(dev))
|
|
return 1;
|
|
|
|
return pci_wait_for_pending(dev, pci_pcie_cap(dev) + PCI_EXP_DEVSTA,
|
|
PCI_EXP_DEVSTA_TRPND);
|
|
}
|
|
EXPORT_SYMBOL(pci_wait_for_pending_transaction);
|
|
|
|
/**
|
|
* pcie_flr - initiate a PCIe function level reset
|
|
* @dev: device to reset
|
|
*
|
|
* Initiate a function level reset unconditionally on @dev without
|
|
* checking any flags and DEVCAP
|
|
*/
|
|
int pcie_flr(struct pci_dev *dev)
|
|
{
|
|
if (!pci_wait_for_pending_transaction(dev))
|
|
pci_err(dev, "timed out waiting for pending transaction; performing function level reset anyway\n");
|
|
|
|
pcie_capability_set_word(dev, PCI_EXP_DEVCTL, PCI_EXP_DEVCTL_BCR_FLR);
|
|
|
|
if (dev->imm_ready)
|
|
return 0;
|
|
|
|
/*
|
|
* Per PCIe r4.0, sec 6.6.2, a device must complete an FLR within
|
|
* 100ms, but may silently discard requests while the FLR is in
|
|
* progress. Wait 100ms before trying to access the device.
|
|
*/
|
|
msleep(100);
|
|
|
|
return pci_dev_wait(dev, "FLR", PCIE_RESET_READY_POLL_MS);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pcie_flr);
|
|
|
|
/**
|
|
* pcie_reset_flr - initiate a PCIe function level reset
|
|
* @dev: device to reset
|
|
* @probe: if true, return 0 if device can be reset this way
|
|
*
|
|
* Initiate a function level reset on @dev.
|
|
*/
|
|
int pcie_reset_flr(struct pci_dev *dev, bool probe)
|
|
{
|
|
if (dev->dev_flags & PCI_DEV_FLAGS_NO_FLR_RESET)
|
|
return -ENOTTY;
|
|
|
|
if (!(dev->devcap & PCI_EXP_DEVCAP_FLR))
|
|
return -ENOTTY;
|
|
|
|
if (probe)
|
|
return 0;
|
|
|
|
return pcie_flr(dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pcie_reset_flr);
|
|
|
|
static int pci_af_flr(struct pci_dev *dev, bool probe)
|
|
{
|
|
int pos;
|
|
u8 cap;
|
|
|
|
pos = pci_find_capability(dev, PCI_CAP_ID_AF);
|
|
if (!pos)
|
|
return -ENOTTY;
|
|
|
|
if (dev->dev_flags & PCI_DEV_FLAGS_NO_FLR_RESET)
|
|
return -ENOTTY;
|
|
|
|
pci_read_config_byte(dev, pos + PCI_AF_CAP, &cap);
|
|
if (!(cap & PCI_AF_CAP_TP) || !(cap & PCI_AF_CAP_FLR))
|
|
return -ENOTTY;
|
|
|
|
if (probe)
|
|
return 0;
|
|
|
|
/*
|
|
* Wait for Transaction Pending bit to clear. A word-aligned test
|
|
* is used, so we use the control offset rather than status and shift
|
|
* the test bit to match.
|
|
*/
|
|
if (!pci_wait_for_pending(dev, pos + PCI_AF_CTRL,
|
|
PCI_AF_STATUS_TP << 8))
|
|
pci_err(dev, "timed out waiting for pending transaction; performing AF function level reset anyway\n");
|
|
|
|
pci_write_config_byte(dev, pos + PCI_AF_CTRL, PCI_AF_CTRL_FLR);
|
|
|
|
if (dev->imm_ready)
|
|
return 0;
|
|
|
|
/*
|
|
* Per Advanced Capabilities for Conventional PCI ECN, 13 April 2006,
|
|
* updated 27 July 2006; a device must complete an FLR within
|
|
* 100ms, but may silently discard requests while the FLR is in
|
|
* progress. Wait 100ms before trying to access the device.
|
|
*/
|
|
msleep(100);
|
|
|
|
return pci_dev_wait(dev, "AF_FLR", PCIE_RESET_READY_POLL_MS);
|
|
}
|
|
|
|
/**
|
|
* pci_pm_reset - Put device into PCI_D3 and back into PCI_D0.
|
|
* @dev: Device to reset.
|
|
* @probe: if true, return 0 if the device can be reset this way.
|
|
*
|
|
* If @dev supports native PCI PM and its PCI_PM_CTRL_NO_SOFT_RESET flag is
|
|
* unset, it will be reinitialized internally when going from PCI_D3hot to
|
|
* PCI_D0. If that's the case and the device is not in a low-power state
|
|
* already, force it into PCI_D3hot and back to PCI_D0, causing it to be reset.
|
|
*
|
|
* NOTE: This causes the caller to sleep for twice the device power transition
|
|
* cooldown period, which for the D0->D3hot and D3hot->D0 transitions is 10 ms
|
|
* by default (i.e. unless the @dev's d3hot_delay field has a different value).
|
|
* Moreover, only devices in D0 can be reset by this function.
|
|
*/
|
|
static int pci_pm_reset(struct pci_dev *dev, bool probe)
|
|
{
|
|
u16 csr;
|
|
|
|
if (!dev->pm_cap || dev->dev_flags & PCI_DEV_FLAGS_NO_PM_RESET)
|
|
return -ENOTTY;
|
|
|
|
pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &csr);
|
|
if (csr & PCI_PM_CTRL_NO_SOFT_RESET)
|
|
return -ENOTTY;
|
|
|
|
if (probe)
|
|
return 0;
|
|
|
|
if (dev->current_state != PCI_D0)
|
|
return -EINVAL;
|
|
|
|
csr &= ~PCI_PM_CTRL_STATE_MASK;
|
|
csr |= PCI_D3hot;
|
|
pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, csr);
|
|
pci_dev_d3_sleep(dev);
|
|
|
|
csr &= ~PCI_PM_CTRL_STATE_MASK;
|
|
csr |= PCI_D0;
|
|
pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, csr);
|
|
pci_dev_d3_sleep(dev);
|
|
|
|
return pci_dev_wait(dev, "PM D3hot->D0", PCIE_RESET_READY_POLL_MS);
|
|
}
|
|
|
|
/**
|
|
* pcie_wait_for_link_delay - Wait until link is active or inactive
|
|
* @pdev: Bridge device
|
|
* @active: waiting for active or inactive?
|
|
* @delay: Delay to wait after link has become active (in ms)
|
|
*
|
|
* Use this to wait till link becomes active or inactive.
|
|
*/
|
|
static bool pcie_wait_for_link_delay(struct pci_dev *pdev, bool active,
|
|
int delay)
|
|
{
|
|
int timeout = 1000;
|
|
bool ret;
|
|
u16 lnk_status;
|
|
|
|
/*
|
|
* Some controllers might not implement link active reporting. In this
|
|
* case, we wait for 1000 ms + any delay requested by the caller.
|
|
*/
|
|
if (!pdev->link_active_reporting) {
|
|
msleep(timeout + delay);
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* PCIe r4.0 sec 6.6.1, a component must enter LTSSM Detect within 20ms,
|
|
* after which we should expect an link active if the reset was
|
|
* successful. If so, software must wait a minimum 100ms before sending
|
|
* configuration requests to devices downstream this port.
|
|
*
|
|
* If the link fails to activate, either the device was physically
|
|
* removed or the link is permanently failed.
|
|
*/
|
|
if (active)
|
|
msleep(20);
|
|
for (;;) {
|
|
pcie_capability_read_word(pdev, PCI_EXP_LNKSTA, &lnk_status);
|
|
ret = !!(lnk_status & PCI_EXP_LNKSTA_DLLLA);
|
|
if (ret == active)
|
|
break;
|
|
if (timeout <= 0)
|
|
break;
|
|
msleep(10);
|
|
timeout -= 10;
|
|
}
|
|
if (active && ret)
|
|
msleep(delay);
|
|
|
|
return ret == active;
|
|
}
|
|
|
|
/**
|
|
* pcie_wait_for_link - Wait until link is active or inactive
|
|
* @pdev: Bridge device
|
|
* @active: waiting for active or inactive?
|
|
*
|
|
* Use this to wait till link becomes active or inactive.
|
|
*/
|
|
bool pcie_wait_for_link(struct pci_dev *pdev, bool active)
|
|
{
|
|
return pcie_wait_for_link_delay(pdev, active, 100);
|
|
}
|
|
|
|
/*
|
|
* Find maximum D3cold delay required by all the devices on the bus. The
|
|
* spec says 100 ms, but firmware can lower it and we allow drivers to
|
|
* increase it as well.
|
|
*
|
|
* Called with @pci_bus_sem locked for reading.
|
|
*/
|
|
static int pci_bus_max_d3cold_delay(const struct pci_bus *bus)
|
|
{
|
|
const struct pci_dev *pdev;
|
|
int min_delay = 100;
|
|
int max_delay = 0;
|
|
|
|
list_for_each_entry(pdev, &bus->devices, bus_list) {
|
|
if (pdev->d3cold_delay < min_delay)
|
|
min_delay = pdev->d3cold_delay;
|
|
if (pdev->d3cold_delay > max_delay)
|
|
max_delay = pdev->d3cold_delay;
|
|
}
|
|
|
|
return max(min_delay, max_delay);
|
|
}
|
|
|
|
/**
|
|
* pci_bridge_wait_for_secondary_bus - Wait for secondary bus to be accessible
|
|
* @dev: PCI bridge
|
|
*
|
|
* Handle necessary delays before access to the devices on the secondary
|
|
* side of the bridge are permitted after D3cold to D0 transition.
|
|
*
|
|
* For PCIe this means the delays in PCIe 5.0 section 6.6.1. For
|
|
* conventional PCI it means Tpvrh + Trhfa specified in PCI 3.0 section
|
|
* 4.3.2.
|
|
*/
|
|
void pci_bridge_wait_for_secondary_bus(struct pci_dev *dev)
|
|
{
|
|
struct pci_dev *child;
|
|
int delay;
|
|
|
|
if (pci_dev_is_disconnected(dev))
|
|
return;
|
|
|
|
if (!pci_is_bridge(dev) || !dev->bridge_d3)
|
|
return;
|
|
|
|
down_read(&pci_bus_sem);
|
|
|
|
/*
|
|
* We only deal with devices that are present currently on the bus.
|
|
* For any hot-added devices the access delay is handled in pciehp
|
|
* board_added(). In case of ACPI hotplug the firmware is expected
|
|
* to configure the devices before OS is notified.
|
|
*/
|
|
if (!dev->subordinate || list_empty(&dev->subordinate->devices)) {
|
|
up_read(&pci_bus_sem);
|
|
return;
|
|
}
|
|
|
|
/* Take d3cold_delay requirements into account */
|
|
delay = pci_bus_max_d3cold_delay(dev->subordinate);
|
|
if (!delay) {
|
|
up_read(&pci_bus_sem);
|
|
return;
|
|
}
|
|
|
|
child = list_first_entry(&dev->subordinate->devices, struct pci_dev,
|
|
bus_list);
|
|
up_read(&pci_bus_sem);
|
|
|
|
/*
|
|
* Conventional PCI and PCI-X we need to wait Tpvrh + Trhfa before
|
|
* accessing the device after reset (that is 1000 ms + 100 ms). In
|
|
* practice this should not be needed because we don't do power
|
|
* management for them (see pci_bridge_d3_possible()).
|
|
*/
|
|
if (!pci_is_pcie(dev)) {
|
|
pci_dbg(dev, "waiting %d ms for secondary bus\n", 1000 + delay);
|
|
msleep(1000 + delay);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* For PCIe downstream and root ports that do not support speeds
|
|
* greater than 5 GT/s need to wait minimum 100 ms. For higher
|
|
* speeds (gen3) we need to wait first for the data link layer to
|
|
* become active.
|
|
*
|
|
* However, 100 ms is the minimum and the PCIe spec says the
|
|
* software must allow at least 1s before it can determine that the
|
|
* device that did not respond is a broken device. There is
|
|
* evidence that 100 ms is not always enough, for example certain
|
|
* Titan Ridge xHCI controller does not always respond to
|
|
* configuration requests if we only wait for 100 ms (see
|
|
* https://bugzilla.kernel.org/show_bug.cgi?id=203885).
|
|
*
|
|
* Therefore we wait for 100 ms and check for the device presence.
|
|
* If it is still not present give it an additional 100 ms.
|
|
*/
|
|
if (!pcie_downstream_port(dev))
|
|
return;
|
|
|
|
if (pcie_get_speed_cap(dev) <= PCIE_SPEED_5_0GT) {
|
|
pci_dbg(dev, "waiting %d ms for downstream link\n", delay);
|
|
msleep(delay);
|
|
} else {
|
|
pci_dbg(dev, "waiting %d ms for downstream link, after activation\n",
|
|
delay);
|
|
if (!pcie_wait_for_link_delay(dev, true, delay)) {
|
|
/* Did not train, no need to wait any further */
|
|
pci_info(dev, "Data Link Layer Link Active not set in 1000 msec\n");
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (!pci_device_is_present(child)) {
|
|
pci_dbg(child, "waiting additional %d ms to become accessible\n", delay);
|
|
msleep(delay);
|
|
}
|
|
}
|
|
|
|
void pci_reset_secondary_bus(struct pci_dev *dev)
|
|
{
|
|
u16 ctrl;
|
|
|
|
pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &ctrl);
|
|
ctrl |= PCI_BRIDGE_CTL_BUS_RESET;
|
|
pci_write_config_word(dev, PCI_BRIDGE_CONTROL, ctrl);
|
|
|
|
/*
|
|
* PCI spec v3.0 7.6.4.2 requires minimum Trst of 1ms. Double
|
|
* this to 2ms to ensure that we meet the minimum requirement.
|
|
*/
|
|
msleep(2);
|
|
|
|
ctrl &= ~PCI_BRIDGE_CTL_BUS_RESET;
|
|
pci_write_config_word(dev, PCI_BRIDGE_CONTROL, ctrl);
|
|
|
|
/*
|
|
* Trhfa for conventional PCI is 2^25 clock cycles.
|
|
* Assuming a minimum 33MHz clock this results in a 1s
|
|
* delay before we can consider subordinate devices to
|
|
* be re-initialized. PCIe has some ways to shorten this,
|
|
* but we don't make use of them yet.
|
|
*/
|
|
ssleep(1);
|
|
}
|
|
|
|
void __weak pcibios_reset_secondary_bus(struct pci_dev *dev)
|
|
{
|
|
pci_reset_secondary_bus(dev);
|
|
}
|
|
|
|
/**
|
|
* pci_bridge_secondary_bus_reset - Reset the secondary bus on a PCI bridge.
|
|
* @dev: Bridge device
|
|
*
|
|
* Use the bridge control register to assert reset on the secondary bus.
|
|
* Devices on the secondary bus are left in power-on state.
|
|
*/
|
|
int pci_bridge_secondary_bus_reset(struct pci_dev *dev)
|
|
{
|
|
pcibios_reset_secondary_bus(dev);
|
|
|
|
return pci_dev_wait(dev, "bus reset", PCIE_RESET_READY_POLL_MS);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_bridge_secondary_bus_reset);
|
|
|
|
static int pci_parent_bus_reset(struct pci_dev *dev, bool probe)
|
|
{
|
|
struct pci_dev *pdev;
|
|
|
|
if (pci_is_root_bus(dev->bus) || dev->subordinate ||
|
|
!dev->bus->self || dev->dev_flags & PCI_DEV_FLAGS_NO_BUS_RESET)
|
|
return -ENOTTY;
|
|
|
|
list_for_each_entry(pdev, &dev->bus->devices, bus_list)
|
|
if (pdev != dev)
|
|
return -ENOTTY;
|
|
|
|
if (probe)
|
|
return 0;
|
|
|
|
return pci_bridge_secondary_bus_reset(dev->bus->self);
|
|
}
|
|
|
|
static int pci_reset_hotplug_slot(struct hotplug_slot *hotplug, bool probe)
|
|
{
|
|
int rc = -ENOTTY;
|
|
|
|
if (!hotplug || !try_module_get(hotplug->owner))
|
|
return rc;
|
|
|
|
if (hotplug->ops->reset_slot)
|
|
rc = hotplug->ops->reset_slot(hotplug, probe);
|
|
|
|
module_put(hotplug->owner);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int pci_dev_reset_slot_function(struct pci_dev *dev, bool probe)
|
|
{
|
|
if (dev->multifunction || dev->subordinate || !dev->slot ||
|
|
dev->dev_flags & PCI_DEV_FLAGS_NO_BUS_RESET)
|
|
return -ENOTTY;
|
|
|
|
return pci_reset_hotplug_slot(dev->slot->hotplug, probe);
|
|
}
|
|
|
|
static int pci_reset_bus_function(struct pci_dev *dev, bool probe)
|
|
{
|
|
int rc;
|
|
|
|
rc = pci_dev_reset_slot_function(dev, probe);
|
|
if (rc != -ENOTTY)
|
|
return rc;
|
|
return pci_parent_bus_reset(dev, probe);
|
|
}
|
|
|
|
void pci_dev_lock(struct pci_dev *dev)
|
|
{
|
|
/* block PM suspend, driver probe, etc. */
|
|
device_lock(&dev->dev);
|
|
pci_cfg_access_lock(dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_dev_lock);
|
|
|
|
/* Return 1 on successful lock, 0 on contention */
|
|
int pci_dev_trylock(struct pci_dev *dev)
|
|
{
|
|
if (device_trylock(&dev->dev)) {
|
|
if (pci_cfg_access_trylock(dev))
|
|
return 1;
|
|
device_unlock(&dev->dev);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_dev_trylock);
|
|
|
|
void pci_dev_unlock(struct pci_dev *dev)
|
|
{
|
|
pci_cfg_access_unlock(dev);
|
|
device_unlock(&dev->dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_dev_unlock);
|
|
|
|
static void pci_dev_save_and_disable(struct pci_dev *dev)
|
|
{
|
|
const struct pci_error_handlers *err_handler =
|
|
dev->driver ? dev->driver->err_handler : NULL;
|
|
|
|
/*
|
|
* dev->driver->err_handler->reset_prepare() is protected against
|
|
* races with ->remove() by the device lock, which must be held by
|
|
* the caller.
|
|
*/
|
|
if (err_handler && err_handler->reset_prepare)
|
|
err_handler->reset_prepare(dev);
|
|
|
|
/*
|
|
* Wake-up device prior to save. PM registers default to D0 after
|
|
* reset and a simple register restore doesn't reliably return
|
|
* to a non-D0 state anyway.
|
|
*/
|
|
pci_set_power_state(dev, PCI_D0);
|
|
|
|
pci_save_state(dev);
|
|
/*
|
|
* Disable the device by clearing the Command register, except for
|
|
* INTx-disable which is set. This not only disables MMIO and I/O port
|
|
* BARs, but also prevents the device from being Bus Master, preventing
|
|
* DMA from the device including MSI/MSI-X interrupts. For PCI 2.3
|
|
* compliant devices, INTx-disable prevents legacy interrupts.
|
|
*/
|
|
pci_write_config_word(dev, PCI_COMMAND, PCI_COMMAND_INTX_DISABLE);
|
|
}
|
|
|
|
static void pci_dev_restore(struct pci_dev *dev)
|
|
{
|
|
const struct pci_error_handlers *err_handler =
|
|
dev->driver ? dev->driver->err_handler : NULL;
|
|
|
|
pci_restore_state(dev);
|
|
|
|
/*
|
|
* dev->driver->err_handler->reset_done() is protected against
|
|
* races with ->remove() by the device lock, which must be held by
|
|
* the caller.
|
|
*/
|
|
if (err_handler && err_handler->reset_done)
|
|
err_handler->reset_done(dev);
|
|
}
|
|
|
|
/* dev->reset_methods[] is a 0-terminated list of indices into this array */
|
|
static const struct pci_reset_fn_method pci_reset_fn_methods[] = {
|
|
{ },
|
|
{ pci_dev_specific_reset, .name = "device_specific" },
|
|
{ pci_dev_acpi_reset, .name = "acpi" },
|
|
{ pcie_reset_flr, .name = "flr" },
|
|
{ pci_af_flr, .name = "af_flr" },
|
|
{ pci_pm_reset, .name = "pm" },
|
|
{ pci_reset_bus_function, .name = "bus" },
|
|
};
|
|
|
|
static ssize_t reset_method_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct pci_dev *pdev = to_pci_dev(dev);
|
|
ssize_t len = 0;
|
|
int i, m;
|
|
|
|
for (i = 0; i < PCI_NUM_RESET_METHODS; i++) {
|
|
m = pdev->reset_methods[i];
|
|
if (!m)
|
|
break;
|
|
|
|
len += sysfs_emit_at(buf, len, "%s%s", len ? " " : "",
|
|
pci_reset_fn_methods[m].name);
|
|
}
|
|
|
|
if (len)
|
|
len += sysfs_emit_at(buf, len, "\n");
|
|
|
|
return len;
|
|
}
|
|
|
|
static int reset_method_lookup(const char *name)
|
|
{
|
|
int m;
|
|
|
|
for (m = 1; m < PCI_NUM_RESET_METHODS; m++) {
|
|
if (sysfs_streq(name, pci_reset_fn_methods[m].name))
|
|
return m;
|
|
}
|
|
|
|
return 0; /* not found */
|
|
}
|
|
|
|
static ssize_t reset_method_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct pci_dev *pdev = to_pci_dev(dev);
|
|
char *options, *name;
|
|
int m, n;
|
|
u8 reset_methods[PCI_NUM_RESET_METHODS] = { 0 };
|
|
|
|
if (sysfs_streq(buf, "")) {
|
|
pdev->reset_methods[0] = 0;
|
|
pci_warn(pdev, "All device reset methods disabled by user");
|
|
return count;
|
|
}
|
|
|
|
if (sysfs_streq(buf, "default")) {
|
|
pci_init_reset_methods(pdev);
|
|
return count;
|
|
}
|
|
|
|
options = kstrndup(buf, count, GFP_KERNEL);
|
|
if (!options)
|
|
return -ENOMEM;
|
|
|
|
n = 0;
|
|
while ((name = strsep(&options, " ")) != NULL) {
|
|
if (sysfs_streq(name, ""))
|
|
continue;
|
|
|
|
name = strim(name);
|
|
|
|
m = reset_method_lookup(name);
|
|
if (!m) {
|
|
pci_err(pdev, "Invalid reset method '%s'", name);
|
|
goto error;
|
|
}
|
|
|
|
if (pci_reset_fn_methods[m].reset_fn(pdev, PCI_RESET_PROBE)) {
|
|
pci_err(pdev, "Unsupported reset method '%s'", name);
|
|
goto error;
|
|
}
|
|
|
|
if (n == PCI_NUM_RESET_METHODS - 1) {
|
|
pci_err(pdev, "Too many reset methods\n");
|
|
goto error;
|
|
}
|
|
|
|
reset_methods[n++] = m;
|
|
}
|
|
|
|
reset_methods[n] = 0;
|
|
|
|
/* Warn if dev-specific supported but not highest priority */
|
|
if (pci_reset_fn_methods[1].reset_fn(pdev, PCI_RESET_PROBE) == 0 &&
|
|
reset_methods[0] != 1)
|
|
pci_warn(pdev, "Device-specific reset disabled/de-prioritized by user");
|
|
memcpy(pdev->reset_methods, reset_methods, sizeof(pdev->reset_methods));
|
|
kfree(options);
|
|
return count;
|
|
|
|
error:
|
|
/* Leave previous methods unchanged */
|
|
kfree(options);
|
|
return -EINVAL;
|
|
}
|
|
static DEVICE_ATTR_RW(reset_method);
|
|
|
|
static struct attribute *pci_dev_reset_method_attrs[] = {
|
|
&dev_attr_reset_method.attr,
|
|
NULL,
|
|
};
|
|
|
|
static umode_t pci_dev_reset_method_attr_is_visible(struct kobject *kobj,
|
|
struct attribute *a, int n)
|
|
{
|
|
struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
|
|
|
|
if (!pci_reset_supported(pdev))
|
|
return 0;
|
|
|
|
return a->mode;
|
|
}
|
|
|
|
const struct attribute_group pci_dev_reset_method_attr_group = {
|
|
.attrs = pci_dev_reset_method_attrs,
|
|
.is_visible = pci_dev_reset_method_attr_is_visible,
|
|
};
|
|
|
|
/**
|
|
* __pci_reset_function_locked - reset a PCI device function while holding
|
|
* the @dev mutex lock.
|
|
* @dev: PCI device to reset
|
|
*
|
|
* Some devices allow an individual function to be reset without affecting
|
|
* other functions in the same device. The PCI device must be responsive
|
|
* to PCI config space in order to use this function.
|
|
*
|
|
* The device function is presumed to be unused and the caller is holding
|
|
* the device mutex lock when this function is called.
|
|
*
|
|
* Resetting the device will make the contents of PCI configuration space
|
|
* random, so any caller of this must be prepared to reinitialise the
|
|
* device including MSI, bus mastering, BARs, decoding IO and memory spaces,
|
|
* etc.
|
|
*
|
|
* Returns 0 if the device function was successfully reset or negative if the
|
|
* device doesn't support resetting a single function.
|
|
*/
|
|
int __pci_reset_function_locked(struct pci_dev *dev)
|
|
{
|
|
int i, m, rc;
|
|
|
|
might_sleep();
|
|
|
|
/*
|
|
* A reset method returns -ENOTTY if it doesn't support this device and
|
|
* we should try the next method.
|
|
*
|
|
* If it returns 0 (success), we're finished. If it returns any other
|
|
* error, we're also finished: this indicates that further reset
|
|
* mechanisms might be broken on the device.
|
|
*/
|
|
for (i = 0; i < PCI_NUM_RESET_METHODS; i++) {
|
|
m = dev->reset_methods[i];
|
|
if (!m)
|
|
return -ENOTTY;
|
|
|
|
rc = pci_reset_fn_methods[m].reset_fn(dev, PCI_RESET_DO_RESET);
|
|
if (!rc)
|
|
return 0;
|
|
if (rc != -ENOTTY)
|
|
return rc;
|
|
}
|
|
|
|
return -ENOTTY;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__pci_reset_function_locked);
|
|
|
|
/**
|
|
* pci_init_reset_methods - check whether device can be safely reset
|
|
* and store supported reset mechanisms.
|
|
* @dev: PCI device to check for reset mechanisms
|
|
*
|
|
* Some devices allow an individual function to be reset without affecting
|
|
* other functions in the same device. The PCI device must be in D0-D3hot
|
|
* state.
|
|
*
|
|
* Stores reset mechanisms supported by device in reset_methods byte array
|
|
* which is a member of struct pci_dev.
|
|
*/
|
|
void pci_init_reset_methods(struct pci_dev *dev)
|
|
{
|
|
int m, i, rc;
|
|
|
|
BUILD_BUG_ON(ARRAY_SIZE(pci_reset_fn_methods) != PCI_NUM_RESET_METHODS);
|
|
|
|
might_sleep();
|
|
|
|
i = 0;
|
|
for (m = 1; m < PCI_NUM_RESET_METHODS; m++) {
|
|
rc = pci_reset_fn_methods[m].reset_fn(dev, PCI_RESET_PROBE);
|
|
if (!rc)
|
|
dev->reset_methods[i++] = m;
|
|
else if (rc != -ENOTTY)
|
|
break;
|
|
}
|
|
|
|
dev->reset_methods[i] = 0;
|
|
}
|
|
|
|
/**
|
|
* pci_reset_function - quiesce and reset a PCI device function
|
|
* @dev: PCI device to reset
|
|
*
|
|
* Some devices allow an individual function to be reset without affecting
|
|
* other functions in the same device. The PCI device must be responsive
|
|
* to PCI config space in order to use this function.
|
|
*
|
|
* This function does not just reset the PCI portion of a device, but
|
|
* clears all the state associated with the device. This function differs
|
|
* from __pci_reset_function_locked() in that it saves and restores device state
|
|
* over the reset and takes the PCI device lock.
|
|
*
|
|
* Returns 0 if the device function was successfully reset or negative if the
|
|
* device doesn't support resetting a single function.
|
|
*/
|
|
int pci_reset_function(struct pci_dev *dev)
|
|
{
|
|
int rc;
|
|
|
|
if (!pci_reset_supported(dev))
|
|
return -ENOTTY;
|
|
|
|
pci_dev_lock(dev);
|
|
pci_dev_save_and_disable(dev);
|
|
|
|
rc = __pci_reset_function_locked(dev);
|
|
|
|
pci_dev_restore(dev);
|
|
pci_dev_unlock(dev);
|
|
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_reset_function);
|
|
|
|
/**
|
|
* pci_reset_function_locked - quiesce and reset a PCI device function
|
|
* @dev: PCI device to reset
|
|
*
|
|
* Some devices allow an individual function to be reset without affecting
|
|
* other functions in the same device. The PCI device must be responsive
|
|
* to PCI config space in order to use this function.
|
|
*
|
|
* This function does not just reset the PCI portion of a device, but
|
|
* clears all the state associated with the device. This function differs
|
|
* from __pci_reset_function_locked() in that it saves and restores device state
|
|
* over the reset. It also differs from pci_reset_function() in that it
|
|
* requires the PCI device lock to be held.
|
|
*
|
|
* Returns 0 if the device function was successfully reset or negative if the
|
|
* device doesn't support resetting a single function.
|
|
*/
|
|
int pci_reset_function_locked(struct pci_dev *dev)
|
|
{
|
|
int rc;
|
|
|
|
if (!pci_reset_supported(dev))
|
|
return -ENOTTY;
|
|
|
|
pci_dev_save_and_disable(dev);
|
|
|
|
rc = __pci_reset_function_locked(dev);
|
|
|
|
pci_dev_restore(dev);
|
|
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_reset_function_locked);
|
|
|
|
/**
|
|
* pci_try_reset_function - quiesce and reset a PCI device function
|
|
* @dev: PCI device to reset
|
|
*
|
|
* Same as above, except return -EAGAIN if unable to lock device.
|
|
*/
|
|
int pci_try_reset_function(struct pci_dev *dev)
|
|
{
|
|
int rc;
|
|
|
|
if (!pci_reset_supported(dev))
|
|
return -ENOTTY;
|
|
|
|
if (!pci_dev_trylock(dev))
|
|
return -EAGAIN;
|
|
|
|
pci_dev_save_and_disable(dev);
|
|
rc = __pci_reset_function_locked(dev);
|
|
pci_dev_restore(dev);
|
|
pci_dev_unlock(dev);
|
|
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_try_reset_function);
|
|
|
|
/* Do any devices on or below this bus prevent a bus reset? */
|
|
static bool pci_bus_resetable(struct pci_bus *bus)
|
|
{
|
|
struct pci_dev *dev;
|
|
|
|
|
|
if (bus->self && (bus->self->dev_flags & PCI_DEV_FLAGS_NO_BUS_RESET))
|
|
return false;
|
|
|
|
list_for_each_entry(dev, &bus->devices, bus_list) {
|
|
if (dev->dev_flags & PCI_DEV_FLAGS_NO_BUS_RESET ||
|
|
(dev->subordinate && !pci_bus_resetable(dev->subordinate)))
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/* Lock devices from the top of the tree down */
|
|
static void pci_bus_lock(struct pci_bus *bus)
|
|
{
|
|
struct pci_dev *dev;
|
|
|
|
list_for_each_entry(dev, &bus->devices, bus_list) {
|
|
pci_dev_lock(dev);
|
|
if (dev->subordinate)
|
|
pci_bus_lock(dev->subordinate);
|
|
}
|
|
}
|
|
|
|
/* Unlock devices from the bottom of the tree up */
|
|
static void pci_bus_unlock(struct pci_bus *bus)
|
|
{
|
|
struct pci_dev *dev;
|
|
|
|
list_for_each_entry(dev, &bus->devices, bus_list) {
|
|
if (dev->subordinate)
|
|
pci_bus_unlock(dev->subordinate);
|
|
pci_dev_unlock(dev);
|
|
}
|
|
}
|
|
|
|
/* Return 1 on successful lock, 0 on contention */
|
|
static int pci_bus_trylock(struct pci_bus *bus)
|
|
{
|
|
struct pci_dev *dev;
|
|
|
|
list_for_each_entry(dev, &bus->devices, bus_list) {
|
|
if (!pci_dev_trylock(dev))
|
|
goto unlock;
|
|
if (dev->subordinate) {
|
|
if (!pci_bus_trylock(dev->subordinate)) {
|
|
pci_dev_unlock(dev);
|
|
goto unlock;
|
|
}
|
|
}
|
|
}
|
|
return 1;
|
|
|
|
unlock:
|
|
list_for_each_entry_continue_reverse(dev, &bus->devices, bus_list) {
|
|
if (dev->subordinate)
|
|
pci_bus_unlock(dev->subordinate);
|
|
pci_dev_unlock(dev);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Do any devices on or below this slot prevent a bus reset? */
|
|
static bool pci_slot_resetable(struct pci_slot *slot)
|
|
{
|
|
struct pci_dev *dev;
|
|
|
|
if (slot->bus->self &&
|
|
(slot->bus->self->dev_flags & PCI_DEV_FLAGS_NO_BUS_RESET))
|
|
return false;
|
|
|
|
list_for_each_entry(dev, &slot->bus->devices, bus_list) {
|
|
if (!dev->slot || dev->slot != slot)
|
|
continue;
|
|
if (dev->dev_flags & PCI_DEV_FLAGS_NO_BUS_RESET ||
|
|
(dev->subordinate && !pci_bus_resetable(dev->subordinate)))
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/* Lock devices from the top of the tree down */
|
|
static void pci_slot_lock(struct pci_slot *slot)
|
|
{
|
|
struct pci_dev *dev;
|
|
|
|
list_for_each_entry(dev, &slot->bus->devices, bus_list) {
|
|
if (!dev->slot || dev->slot != slot)
|
|
continue;
|
|
pci_dev_lock(dev);
|
|
if (dev->subordinate)
|
|
pci_bus_lock(dev->subordinate);
|
|
}
|
|
}
|
|
|
|
/* Unlock devices from the bottom of the tree up */
|
|
static void pci_slot_unlock(struct pci_slot *slot)
|
|
{
|
|
struct pci_dev *dev;
|
|
|
|
list_for_each_entry(dev, &slot->bus->devices, bus_list) {
|
|
if (!dev->slot || dev->slot != slot)
|
|
continue;
|
|
if (dev->subordinate)
|
|
pci_bus_unlock(dev->subordinate);
|
|
pci_dev_unlock(dev);
|
|
}
|
|
}
|
|
|
|
/* Return 1 on successful lock, 0 on contention */
|
|
static int pci_slot_trylock(struct pci_slot *slot)
|
|
{
|
|
struct pci_dev *dev;
|
|
|
|
list_for_each_entry(dev, &slot->bus->devices, bus_list) {
|
|
if (!dev->slot || dev->slot != slot)
|
|
continue;
|
|
if (!pci_dev_trylock(dev))
|
|
goto unlock;
|
|
if (dev->subordinate) {
|
|
if (!pci_bus_trylock(dev->subordinate)) {
|
|
pci_dev_unlock(dev);
|
|
goto unlock;
|
|
}
|
|
}
|
|
}
|
|
return 1;
|
|
|
|
unlock:
|
|
list_for_each_entry_continue_reverse(dev,
|
|
&slot->bus->devices, bus_list) {
|
|
if (!dev->slot || dev->slot != slot)
|
|
continue;
|
|
if (dev->subordinate)
|
|
pci_bus_unlock(dev->subordinate);
|
|
pci_dev_unlock(dev);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Save and disable devices from the top of the tree down while holding
|
|
* the @dev mutex lock for the entire tree.
|
|
*/
|
|
static void pci_bus_save_and_disable_locked(struct pci_bus *bus)
|
|
{
|
|
struct pci_dev *dev;
|
|
|
|
list_for_each_entry(dev, &bus->devices, bus_list) {
|
|
pci_dev_save_and_disable(dev);
|
|
if (dev->subordinate)
|
|
pci_bus_save_and_disable_locked(dev->subordinate);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Restore devices from top of the tree down while holding @dev mutex lock
|
|
* for the entire tree. Parent bridges need to be restored before we can
|
|
* get to subordinate devices.
|
|
*/
|
|
static void pci_bus_restore_locked(struct pci_bus *bus)
|
|
{
|
|
struct pci_dev *dev;
|
|
|
|
list_for_each_entry(dev, &bus->devices, bus_list) {
|
|
pci_dev_restore(dev);
|
|
if (dev->subordinate)
|
|
pci_bus_restore_locked(dev->subordinate);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Save and disable devices from the top of the tree down while holding
|
|
* the @dev mutex lock for the entire tree.
|
|
*/
|
|
static void pci_slot_save_and_disable_locked(struct pci_slot *slot)
|
|
{
|
|
struct pci_dev *dev;
|
|
|
|
list_for_each_entry(dev, &slot->bus->devices, bus_list) {
|
|
if (!dev->slot || dev->slot != slot)
|
|
continue;
|
|
pci_dev_save_and_disable(dev);
|
|
if (dev->subordinate)
|
|
pci_bus_save_and_disable_locked(dev->subordinate);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Restore devices from top of the tree down while holding @dev mutex lock
|
|
* for the entire tree. Parent bridges need to be restored before we can
|
|
* get to subordinate devices.
|
|
*/
|
|
static void pci_slot_restore_locked(struct pci_slot *slot)
|
|
{
|
|
struct pci_dev *dev;
|
|
|
|
list_for_each_entry(dev, &slot->bus->devices, bus_list) {
|
|
if (!dev->slot || dev->slot != slot)
|
|
continue;
|
|
pci_dev_restore(dev);
|
|
if (dev->subordinate)
|
|
pci_bus_restore_locked(dev->subordinate);
|
|
}
|
|
}
|
|
|
|
static int pci_slot_reset(struct pci_slot *slot, bool probe)
|
|
{
|
|
int rc;
|
|
|
|
if (!slot || !pci_slot_resetable(slot))
|
|
return -ENOTTY;
|
|
|
|
if (!probe)
|
|
pci_slot_lock(slot);
|
|
|
|
might_sleep();
|
|
|
|
rc = pci_reset_hotplug_slot(slot->hotplug, probe);
|
|
|
|
if (!probe)
|
|
pci_slot_unlock(slot);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* pci_probe_reset_slot - probe whether a PCI slot can be reset
|
|
* @slot: PCI slot to probe
|
|
*
|
|
* Return 0 if slot can be reset, negative if a slot reset is not supported.
|
|
*/
|
|
int pci_probe_reset_slot(struct pci_slot *slot)
|
|
{
|
|
return pci_slot_reset(slot, PCI_RESET_PROBE);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_probe_reset_slot);
|
|
|
|
/**
|
|
* __pci_reset_slot - Try to reset a PCI slot
|
|
* @slot: PCI slot to reset
|
|
*
|
|
* A PCI bus may host multiple slots, each slot may support a reset mechanism
|
|
* independent of other slots. For instance, some slots may support slot power
|
|
* control. In the case of a 1:1 bus to slot architecture, this function may
|
|
* wrap the bus reset to avoid spurious slot related events such as hotplug.
|
|
* Generally a slot reset should be attempted before a bus reset. All of the
|
|
* function of the slot and any subordinate buses behind the slot are reset
|
|
* through this function. PCI config space of all devices in the slot and
|
|
* behind the slot is saved before and restored after reset.
|
|
*
|
|
* Same as above except return -EAGAIN if the slot cannot be locked
|
|
*/
|
|
static int __pci_reset_slot(struct pci_slot *slot)
|
|
{
|
|
int rc;
|
|
|
|
rc = pci_slot_reset(slot, PCI_RESET_PROBE);
|
|
if (rc)
|
|
return rc;
|
|
|
|
if (pci_slot_trylock(slot)) {
|
|
pci_slot_save_and_disable_locked(slot);
|
|
might_sleep();
|
|
rc = pci_reset_hotplug_slot(slot->hotplug, PCI_RESET_DO_RESET);
|
|
pci_slot_restore_locked(slot);
|
|
pci_slot_unlock(slot);
|
|
} else
|
|
rc = -EAGAIN;
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int pci_bus_reset(struct pci_bus *bus, bool probe)
|
|
{
|
|
int ret;
|
|
|
|
if (!bus->self || !pci_bus_resetable(bus))
|
|
return -ENOTTY;
|
|
|
|
if (probe)
|
|
return 0;
|
|
|
|
pci_bus_lock(bus);
|
|
|
|
might_sleep();
|
|
|
|
ret = pci_bridge_secondary_bus_reset(bus->self);
|
|
|
|
pci_bus_unlock(bus);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* pci_bus_error_reset - reset the bridge's subordinate bus
|
|
* @bridge: The parent device that connects to the bus to reset
|
|
*
|
|
* This function will first try to reset the slots on this bus if the method is
|
|
* available. If slot reset fails or is not available, this will fall back to a
|
|
* secondary bus reset.
|
|
*/
|
|
int pci_bus_error_reset(struct pci_dev *bridge)
|
|
{
|
|
struct pci_bus *bus = bridge->subordinate;
|
|
struct pci_slot *slot;
|
|
|
|
if (!bus)
|
|
return -ENOTTY;
|
|
|
|
mutex_lock(&pci_slot_mutex);
|
|
if (list_empty(&bus->slots))
|
|
goto bus_reset;
|
|
|
|
list_for_each_entry(slot, &bus->slots, list)
|
|
if (pci_probe_reset_slot(slot))
|
|
goto bus_reset;
|
|
|
|
list_for_each_entry(slot, &bus->slots, list)
|
|
if (pci_slot_reset(slot, PCI_RESET_DO_RESET))
|
|
goto bus_reset;
|
|
|
|
mutex_unlock(&pci_slot_mutex);
|
|
return 0;
|
|
bus_reset:
|
|
mutex_unlock(&pci_slot_mutex);
|
|
return pci_bus_reset(bridge->subordinate, PCI_RESET_DO_RESET);
|
|
}
|
|
|
|
/**
|
|
* pci_probe_reset_bus - probe whether a PCI bus can be reset
|
|
* @bus: PCI bus to probe
|
|
*
|
|
* Return 0 if bus can be reset, negative if a bus reset is not supported.
|
|
*/
|
|
int pci_probe_reset_bus(struct pci_bus *bus)
|
|
{
|
|
return pci_bus_reset(bus, PCI_RESET_PROBE);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_probe_reset_bus);
|
|
|
|
/**
|
|
* __pci_reset_bus - Try to reset a PCI bus
|
|
* @bus: top level PCI bus to reset
|
|
*
|
|
* Same as above except return -EAGAIN if the bus cannot be locked
|
|
*/
|
|
static int __pci_reset_bus(struct pci_bus *bus)
|
|
{
|
|
int rc;
|
|
|
|
rc = pci_bus_reset(bus, PCI_RESET_PROBE);
|
|
if (rc)
|
|
return rc;
|
|
|
|
if (pci_bus_trylock(bus)) {
|
|
pci_bus_save_and_disable_locked(bus);
|
|
might_sleep();
|
|
rc = pci_bridge_secondary_bus_reset(bus->self);
|
|
pci_bus_restore_locked(bus);
|
|
pci_bus_unlock(bus);
|
|
} else
|
|
rc = -EAGAIN;
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* pci_reset_bus - Try to reset a PCI bus
|
|
* @pdev: top level PCI device to reset via slot/bus
|
|
*
|
|
* Same as above except return -EAGAIN if the bus cannot be locked
|
|
*/
|
|
int pci_reset_bus(struct pci_dev *pdev)
|
|
{
|
|
return (!pci_probe_reset_slot(pdev->slot)) ?
|
|
__pci_reset_slot(pdev->slot) : __pci_reset_bus(pdev->bus);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_reset_bus);
|
|
|
|
/**
|
|
* pcix_get_max_mmrbc - get PCI-X maximum designed memory read byte count
|
|
* @dev: PCI device to query
|
|
*
|
|
* Returns mmrbc: maximum designed memory read count in bytes or
|
|
* appropriate error value.
|
|
*/
|
|
int pcix_get_max_mmrbc(struct pci_dev *dev)
|
|
{
|
|
int cap;
|
|
u32 stat;
|
|
|
|
cap = pci_find_capability(dev, PCI_CAP_ID_PCIX);
|
|
if (!cap)
|
|
return -EINVAL;
|
|
|
|
if (pci_read_config_dword(dev, cap + PCI_X_STATUS, &stat))
|
|
return -EINVAL;
|
|
|
|
return 512 << ((stat & PCI_X_STATUS_MAX_READ) >> 21);
|
|
}
|
|
EXPORT_SYMBOL(pcix_get_max_mmrbc);
|
|
|
|
/**
|
|
* pcix_get_mmrbc - get PCI-X maximum memory read byte count
|
|
* @dev: PCI device to query
|
|
*
|
|
* Returns mmrbc: maximum memory read count in bytes or appropriate error
|
|
* value.
|
|
*/
|
|
int pcix_get_mmrbc(struct pci_dev *dev)
|
|
{
|
|
int cap;
|
|
u16 cmd;
|
|
|
|
cap = pci_find_capability(dev, PCI_CAP_ID_PCIX);
|
|
if (!cap)
|
|
return -EINVAL;
|
|
|
|
if (pci_read_config_word(dev, cap + PCI_X_CMD, &cmd))
|
|
return -EINVAL;
|
|
|
|
return 512 << ((cmd & PCI_X_CMD_MAX_READ) >> 2);
|
|
}
|
|
EXPORT_SYMBOL(pcix_get_mmrbc);
|
|
|
|
/**
|
|
* pcix_set_mmrbc - set PCI-X maximum memory read byte count
|
|
* @dev: PCI device to query
|
|
* @mmrbc: maximum memory read count in bytes
|
|
* valid values are 512, 1024, 2048, 4096
|
|
*
|
|
* If possible sets maximum memory read byte count, some bridges have errata
|
|
* that prevent this.
|
|
*/
|
|
int pcix_set_mmrbc(struct pci_dev *dev, int mmrbc)
|
|
{
|
|
int cap;
|
|
u32 stat, v, o;
|
|
u16 cmd;
|
|
|
|
if (mmrbc < 512 || mmrbc > 4096 || !is_power_of_2(mmrbc))
|
|
return -EINVAL;
|
|
|
|
v = ffs(mmrbc) - 10;
|
|
|
|
cap = pci_find_capability(dev, PCI_CAP_ID_PCIX);
|
|
if (!cap)
|
|
return -EINVAL;
|
|
|
|
if (pci_read_config_dword(dev, cap + PCI_X_STATUS, &stat))
|
|
return -EINVAL;
|
|
|
|
if (v > (stat & PCI_X_STATUS_MAX_READ) >> 21)
|
|
return -E2BIG;
|
|
|
|
if (pci_read_config_word(dev, cap + PCI_X_CMD, &cmd))
|
|
return -EINVAL;
|
|
|
|
o = (cmd & PCI_X_CMD_MAX_READ) >> 2;
|
|
if (o != v) {
|
|
if (v > o && (dev->bus->bus_flags & PCI_BUS_FLAGS_NO_MMRBC))
|
|
return -EIO;
|
|
|
|
cmd &= ~PCI_X_CMD_MAX_READ;
|
|
cmd |= v << 2;
|
|
if (pci_write_config_word(dev, cap + PCI_X_CMD, cmd))
|
|
return -EIO;
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(pcix_set_mmrbc);
|
|
|
|
/**
|
|
* pcie_get_readrq - get PCI Express read request size
|
|
* @dev: PCI device to query
|
|
*
|
|
* Returns maximum memory read request in bytes or appropriate error value.
|
|
*/
|
|
int pcie_get_readrq(struct pci_dev *dev)
|
|
{
|
|
u16 ctl;
|
|
|
|
pcie_capability_read_word(dev, PCI_EXP_DEVCTL, &ctl);
|
|
|
|
return 128 << ((ctl & PCI_EXP_DEVCTL_READRQ) >> 12);
|
|
}
|
|
EXPORT_SYMBOL(pcie_get_readrq);
|
|
|
|
/**
|
|
* pcie_set_readrq - set PCI Express maximum memory read request
|
|
* @dev: PCI device to query
|
|
* @rq: maximum memory read count in bytes
|
|
* valid values are 128, 256, 512, 1024, 2048, 4096
|
|
*
|
|
* If possible sets maximum memory read request in bytes
|
|
*/
|
|
int pcie_set_readrq(struct pci_dev *dev, int rq)
|
|
{
|
|
u16 v;
|
|
int ret;
|
|
|
|
if (rq < 128 || rq > 4096 || !is_power_of_2(rq))
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* If using the "performance" PCIe config, we clamp the read rq
|
|
* size to the max packet size to keep the host bridge from
|
|
* generating requests larger than we can cope with.
|
|
*/
|
|
if (pcie_bus_config == PCIE_BUS_PERFORMANCE) {
|
|
int mps = pcie_get_mps(dev);
|
|
|
|
if (mps < rq)
|
|
rq = mps;
|
|
}
|
|
|
|
v = (ffs(rq) - 8) << 12;
|
|
|
|
ret = pcie_capability_clear_and_set_word(dev, PCI_EXP_DEVCTL,
|
|
PCI_EXP_DEVCTL_READRQ, v);
|
|
|
|
return pcibios_err_to_errno(ret);
|
|
}
|
|
EXPORT_SYMBOL(pcie_set_readrq);
|
|
|
|
/**
|
|
* pcie_get_mps - get PCI Express maximum payload size
|
|
* @dev: PCI device to query
|
|
*
|
|
* Returns maximum payload size in bytes
|
|
*/
|
|
int pcie_get_mps(struct pci_dev *dev)
|
|
{
|
|
u16 ctl;
|
|
|
|
pcie_capability_read_word(dev, PCI_EXP_DEVCTL, &ctl);
|
|
|
|
return 128 << ((ctl & PCI_EXP_DEVCTL_PAYLOAD) >> 5);
|
|
}
|
|
EXPORT_SYMBOL(pcie_get_mps);
|
|
|
|
/**
|
|
* pcie_set_mps - set PCI Express maximum payload size
|
|
* @dev: PCI device to query
|
|
* @mps: maximum payload size in bytes
|
|
* valid values are 128, 256, 512, 1024, 2048, 4096
|
|
*
|
|
* If possible sets maximum payload size
|
|
*/
|
|
int pcie_set_mps(struct pci_dev *dev, int mps)
|
|
{
|
|
u16 v;
|
|
int ret;
|
|
|
|
if (mps < 128 || mps > 4096 || !is_power_of_2(mps))
|
|
return -EINVAL;
|
|
|
|
v = ffs(mps) - 8;
|
|
if (v > dev->pcie_mpss)
|
|
return -EINVAL;
|
|
v <<= 5;
|
|
|
|
ret = pcie_capability_clear_and_set_word(dev, PCI_EXP_DEVCTL,
|
|
PCI_EXP_DEVCTL_PAYLOAD, v);
|
|
|
|
return pcibios_err_to_errno(ret);
|
|
}
|
|
EXPORT_SYMBOL(pcie_set_mps);
|
|
|
|
/**
|
|
* pcie_bandwidth_available - determine minimum link settings of a PCIe
|
|
* device and its bandwidth limitation
|
|
* @dev: PCI device to query
|
|
* @limiting_dev: storage for device causing the bandwidth limitation
|
|
* @speed: storage for speed of limiting device
|
|
* @width: storage for width of limiting device
|
|
*
|
|
* Walk up the PCI device chain and find the point where the minimum
|
|
* bandwidth is available. Return the bandwidth available there and (if
|
|
* limiting_dev, speed, and width pointers are supplied) information about
|
|
* that point. The bandwidth returned is in Mb/s, i.e., megabits/second of
|
|
* raw bandwidth.
|
|
*/
|
|
u32 pcie_bandwidth_available(struct pci_dev *dev, struct pci_dev **limiting_dev,
|
|
enum pci_bus_speed *speed,
|
|
enum pcie_link_width *width)
|
|
{
|
|
u16 lnksta;
|
|
enum pci_bus_speed next_speed;
|
|
enum pcie_link_width next_width;
|
|
u32 bw, next_bw;
|
|
|
|
if (speed)
|
|
*speed = PCI_SPEED_UNKNOWN;
|
|
if (width)
|
|
*width = PCIE_LNK_WIDTH_UNKNOWN;
|
|
|
|
bw = 0;
|
|
|
|
while (dev) {
|
|
pcie_capability_read_word(dev, PCI_EXP_LNKSTA, &lnksta);
|
|
|
|
next_speed = pcie_link_speed[lnksta & PCI_EXP_LNKSTA_CLS];
|
|
next_width = (lnksta & PCI_EXP_LNKSTA_NLW) >>
|
|
PCI_EXP_LNKSTA_NLW_SHIFT;
|
|
|
|
next_bw = next_width * PCIE_SPEED2MBS_ENC(next_speed);
|
|
|
|
/* Check if current device limits the total bandwidth */
|
|
if (!bw || next_bw <= bw) {
|
|
bw = next_bw;
|
|
|
|
if (limiting_dev)
|
|
*limiting_dev = dev;
|
|
if (speed)
|
|
*speed = next_speed;
|
|
if (width)
|
|
*width = next_width;
|
|
}
|
|
|
|
dev = pci_upstream_bridge(dev);
|
|
}
|
|
|
|
return bw;
|
|
}
|
|
EXPORT_SYMBOL(pcie_bandwidth_available);
|
|
|
|
/**
|
|
* pcie_get_speed_cap - query for the PCI device's link speed capability
|
|
* @dev: PCI device to query
|
|
*
|
|
* Query the PCI device speed capability. Return the maximum link speed
|
|
* supported by the device.
|
|
*/
|
|
enum pci_bus_speed pcie_get_speed_cap(struct pci_dev *dev)
|
|
{
|
|
u32 lnkcap2, lnkcap;
|
|
|
|
/*
|
|
* Link Capabilities 2 was added in PCIe r3.0, sec 7.8.18. The
|
|
* implementation note there recommends using the Supported Link
|
|
* Speeds Vector in Link Capabilities 2 when supported.
|
|
*
|
|
* Without Link Capabilities 2, i.e., prior to PCIe r3.0, software
|
|
* should use the Supported Link Speeds field in Link Capabilities,
|
|
* where only 2.5 GT/s and 5.0 GT/s speeds were defined.
|
|
*/
|
|
pcie_capability_read_dword(dev, PCI_EXP_LNKCAP2, &lnkcap2);
|
|
|
|
/* PCIe r3.0-compliant */
|
|
if (lnkcap2)
|
|
return PCIE_LNKCAP2_SLS2SPEED(lnkcap2);
|
|
|
|
pcie_capability_read_dword(dev, PCI_EXP_LNKCAP, &lnkcap);
|
|
if ((lnkcap & PCI_EXP_LNKCAP_SLS) == PCI_EXP_LNKCAP_SLS_5_0GB)
|
|
return PCIE_SPEED_5_0GT;
|
|
else if ((lnkcap & PCI_EXP_LNKCAP_SLS) == PCI_EXP_LNKCAP_SLS_2_5GB)
|
|
return PCIE_SPEED_2_5GT;
|
|
|
|
return PCI_SPEED_UNKNOWN;
|
|
}
|
|
EXPORT_SYMBOL(pcie_get_speed_cap);
|
|
|
|
/**
|
|
* pcie_get_width_cap - query for the PCI device's link width capability
|
|
* @dev: PCI device to query
|
|
*
|
|
* Query the PCI device width capability. Return the maximum link width
|
|
* supported by the device.
|
|
*/
|
|
enum pcie_link_width pcie_get_width_cap(struct pci_dev *dev)
|
|
{
|
|
u32 lnkcap;
|
|
|
|
pcie_capability_read_dword(dev, PCI_EXP_LNKCAP, &lnkcap);
|
|
if (lnkcap)
|
|
return (lnkcap & PCI_EXP_LNKCAP_MLW) >> 4;
|
|
|
|
return PCIE_LNK_WIDTH_UNKNOWN;
|
|
}
|
|
EXPORT_SYMBOL(pcie_get_width_cap);
|
|
|
|
/**
|
|
* pcie_bandwidth_capable - calculate a PCI device's link bandwidth capability
|
|
* @dev: PCI device
|
|
* @speed: storage for link speed
|
|
* @width: storage for link width
|
|
*
|
|
* Calculate a PCI device's link bandwidth by querying for its link speed
|
|
* and width, multiplying them, and applying encoding overhead. The result
|
|
* is in Mb/s, i.e., megabits/second of raw bandwidth.
|
|
*/
|
|
u32 pcie_bandwidth_capable(struct pci_dev *dev, enum pci_bus_speed *speed,
|
|
enum pcie_link_width *width)
|
|
{
|
|
*speed = pcie_get_speed_cap(dev);
|
|
*width = pcie_get_width_cap(dev);
|
|
|
|
if (*speed == PCI_SPEED_UNKNOWN || *width == PCIE_LNK_WIDTH_UNKNOWN)
|
|
return 0;
|
|
|
|
return *width * PCIE_SPEED2MBS_ENC(*speed);
|
|
}
|
|
|
|
/**
|
|
* __pcie_print_link_status - Report the PCI device's link speed and width
|
|
* @dev: PCI device to query
|
|
* @verbose: Print info even when enough bandwidth is available
|
|
*
|
|
* If the available bandwidth at the device is less than the device is
|
|
* capable of, report the device's maximum possible bandwidth and the
|
|
* upstream link that limits its performance. If @verbose, always print
|
|
* the available bandwidth, even if the device isn't constrained.
|
|
*/
|
|
void __pcie_print_link_status(struct pci_dev *dev, bool verbose)
|
|
{
|
|
enum pcie_link_width width, width_cap;
|
|
enum pci_bus_speed speed, speed_cap;
|
|
struct pci_dev *limiting_dev = NULL;
|
|
u32 bw_avail, bw_cap;
|
|
|
|
bw_cap = pcie_bandwidth_capable(dev, &speed_cap, &width_cap);
|
|
bw_avail = pcie_bandwidth_available(dev, &limiting_dev, &speed, &width);
|
|
|
|
if (bw_avail >= bw_cap && verbose)
|
|
pci_info(dev, "%u.%03u Gb/s available PCIe bandwidth (%s x%d link)\n",
|
|
bw_cap / 1000, bw_cap % 1000,
|
|
pci_speed_string(speed_cap), width_cap);
|
|
else if (bw_avail < bw_cap)
|
|
pci_info(dev, "%u.%03u Gb/s available PCIe bandwidth, limited by %s x%d link at %s (capable of %u.%03u Gb/s with %s x%d link)\n",
|
|
bw_avail / 1000, bw_avail % 1000,
|
|
pci_speed_string(speed), width,
|
|
limiting_dev ? pci_name(limiting_dev) : "<unknown>",
|
|
bw_cap / 1000, bw_cap % 1000,
|
|
pci_speed_string(speed_cap), width_cap);
|
|
}
|
|
|
|
/**
|
|
* pcie_print_link_status - Report the PCI device's link speed and width
|
|
* @dev: PCI device to query
|
|
*
|
|
* Report the available bandwidth at the device.
|
|
*/
|
|
void pcie_print_link_status(struct pci_dev *dev)
|
|
{
|
|
__pcie_print_link_status(dev, true);
|
|
}
|
|
EXPORT_SYMBOL(pcie_print_link_status);
|
|
|
|
/**
|
|
* pci_select_bars - Make BAR mask from the type of resource
|
|
* @dev: the PCI device for which BAR mask is made
|
|
* @flags: resource type mask to be selected
|
|
*
|
|
* This helper routine makes bar mask from the type of resource.
|
|
*/
|
|
int pci_select_bars(struct pci_dev *dev, unsigned long flags)
|
|
{
|
|
int i, bars = 0;
|
|
for (i = 0; i < PCI_NUM_RESOURCES; i++)
|
|
if (pci_resource_flags(dev, i) & flags)
|
|
bars |= (1 << i);
|
|
return bars;
|
|
}
|
|
EXPORT_SYMBOL(pci_select_bars);
|
|
|
|
/* Some architectures require additional programming to enable VGA */
|
|
static arch_set_vga_state_t arch_set_vga_state;
|
|
|
|
void __init pci_register_set_vga_state(arch_set_vga_state_t func)
|
|
{
|
|
arch_set_vga_state = func; /* NULL disables */
|
|
}
|
|
|
|
static int pci_set_vga_state_arch(struct pci_dev *dev, bool decode,
|
|
unsigned int command_bits, u32 flags)
|
|
{
|
|
if (arch_set_vga_state)
|
|
return arch_set_vga_state(dev, decode, command_bits,
|
|
flags);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pci_set_vga_state - set VGA decode state on device and parents if requested
|
|
* @dev: the PCI device
|
|
* @decode: true = enable decoding, false = disable decoding
|
|
* @command_bits: PCI_COMMAND_IO and/or PCI_COMMAND_MEMORY
|
|
* @flags: traverse ancestors and change bridges
|
|
* CHANGE_BRIDGE_ONLY / CHANGE_BRIDGE
|
|
*/
|
|
int pci_set_vga_state(struct pci_dev *dev, bool decode,
|
|
unsigned int command_bits, u32 flags)
|
|
{
|
|
struct pci_bus *bus;
|
|
struct pci_dev *bridge;
|
|
u16 cmd;
|
|
int rc;
|
|
|
|
WARN_ON((flags & PCI_VGA_STATE_CHANGE_DECODES) && (command_bits & ~(PCI_COMMAND_IO|PCI_COMMAND_MEMORY)));
|
|
|
|
/* ARCH specific VGA enables */
|
|
rc = pci_set_vga_state_arch(dev, decode, command_bits, flags);
|
|
if (rc)
|
|
return rc;
|
|
|
|
if (flags & PCI_VGA_STATE_CHANGE_DECODES) {
|
|
pci_read_config_word(dev, PCI_COMMAND, &cmd);
|
|
if (decode)
|
|
cmd |= command_bits;
|
|
else
|
|
cmd &= ~command_bits;
|
|
pci_write_config_word(dev, PCI_COMMAND, cmd);
|
|
}
|
|
|
|
if (!(flags & PCI_VGA_STATE_CHANGE_BRIDGE))
|
|
return 0;
|
|
|
|
bus = dev->bus;
|
|
while (bus) {
|
|
bridge = bus->self;
|
|
if (bridge) {
|
|
pci_read_config_word(bridge, PCI_BRIDGE_CONTROL,
|
|
&cmd);
|
|
if (decode)
|
|
cmd |= PCI_BRIDGE_CTL_VGA;
|
|
else
|
|
cmd &= ~PCI_BRIDGE_CTL_VGA;
|
|
pci_write_config_word(bridge, PCI_BRIDGE_CONTROL,
|
|
cmd);
|
|
}
|
|
bus = bus->parent;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_ACPI
|
|
bool pci_pr3_present(struct pci_dev *pdev)
|
|
{
|
|
struct acpi_device *adev;
|
|
|
|
if (acpi_disabled)
|
|
return false;
|
|
|
|
adev = ACPI_COMPANION(&pdev->dev);
|
|
if (!adev)
|
|
return false;
|
|
|
|
return adev->power.flags.power_resources &&
|
|
acpi_has_method(adev->handle, "_PR3");
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_pr3_present);
|
|
#endif
|
|
|
|
/**
|
|
* pci_add_dma_alias - Add a DMA devfn alias for a device
|
|
* @dev: the PCI device for which alias is added
|
|
* @devfn_from: alias slot and function
|
|
* @nr_devfns: number of subsequent devfns to alias
|
|
*
|
|
* This helper encodes an 8-bit devfn as a bit number in dma_alias_mask
|
|
* which is used to program permissible bus-devfn source addresses for DMA
|
|
* requests in an IOMMU. These aliases factor into IOMMU group creation
|
|
* and are useful for devices generating DMA requests beyond or different
|
|
* from their logical bus-devfn. Examples include device quirks where the
|
|
* device simply uses the wrong devfn, as well as non-transparent bridges
|
|
* where the alias may be a proxy for devices in another domain.
|
|
*
|
|
* IOMMU group creation is performed during device discovery or addition,
|
|
* prior to any potential DMA mapping and therefore prior to driver probing
|
|
* (especially for userspace assigned devices where IOMMU group definition
|
|
* cannot be left as a userspace activity). DMA aliases should therefore
|
|
* be configured via quirks, such as the PCI fixup header quirk.
|
|
*/
|
|
void pci_add_dma_alias(struct pci_dev *dev, u8 devfn_from,
|
|
unsigned int nr_devfns)
|
|
{
|
|
int devfn_to;
|
|
|
|
nr_devfns = min(nr_devfns, (unsigned int)MAX_NR_DEVFNS - devfn_from);
|
|
devfn_to = devfn_from + nr_devfns - 1;
|
|
|
|
if (!dev->dma_alias_mask)
|
|
dev->dma_alias_mask = bitmap_zalloc(MAX_NR_DEVFNS, GFP_KERNEL);
|
|
if (!dev->dma_alias_mask) {
|
|
pci_warn(dev, "Unable to allocate DMA alias mask\n");
|
|
return;
|
|
}
|
|
|
|
bitmap_set(dev->dma_alias_mask, devfn_from, nr_devfns);
|
|
|
|
if (nr_devfns == 1)
|
|
pci_info(dev, "Enabling fixed DMA alias to %02x.%d\n",
|
|
PCI_SLOT(devfn_from), PCI_FUNC(devfn_from));
|
|
else if (nr_devfns > 1)
|
|
pci_info(dev, "Enabling fixed DMA alias for devfn range from %02x.%d to %02x.%d\n",
|
|
PCI_SLOT(devfn_from), PCI_FUNC(devfn_from),
|
|
PCI_SLOT(devfn_to), PCI_FUNC(devfn_to));
|
|
}
|
|
|
|
bool pci_devs_are_dma_aliases(struct pci_dev *dev1, struct pci_dev *dev2)
|
|
{
|
|
return (dev1->dma_alias_mask &&
|
|
test_bit(dev2->devfn, dev1->dma_alias_mask)) ||
|
|
(dev2->dma_alias_mask &&
|
|
test_bit(dev1->devfn, dev2->dma_alias_mask)) ||
|
|
pci_real_dma_dev(dev1) == dev2 ||
|
|
pci_real_dma_dev(dev2) == dev1;
|
|
}
|
|
|
|
bool pci_device_is_present(struct pci_dev *pdev)
|
|
{
|
|
u32 v;
|
|
|
|
/* Check PF if pdev is a VF, since VF Vendor/Device IDs are 0xffff */
|
|
pdev = pci_physfn(pdev);
|
|
if (pci_dev_is_disconnected(pdev))
|
|
return false;
|
|
return pci_bus_read_dev_vendor_id(pdev->bus, pdev->devfn, &v, 0);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_device_is_present);
|
|
|
|
void pci_ignore_hotplug(struct pci_dev *dev)
|
|
{
|
|
struct pci_dev *bridge = dev->bus->self;
|
|
|
|
dev->ignore_hotplug = 1;
|
|
/* Propagate the "ignore hotplug" setting to the parent bridge. */
|
|
if (bridge)
|
|
bridge->ignore_hotplug = 1;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_ignore_hotplug);
|
|
|
|
/**
|
|
* pci_real_dma_dev - Get PCI DMA device for PCI device
|
|
* @dev: the PCI device that may have a PCI DMA alias
|
|
*
|
|
* Permits the platform to provide architecture-specific functionality to
|
|
* devices needing to alias DMA to another PCI device on another PCI bus. If
|
|
* the PCI device is on the same bus, it is recommended to use
|
|
* pci_add_dma_alias(). This is the default implementation. Architecture
|
|
* implementations can override this.
|
|
*/
|
|
struct pci_dev __weak *pci_real_dma_dev(struct pci_dev *dev)
|
|
{
|
|
return dev;
|
|
}
|
|
|
|
resource_size_t __weak pcibios_default_alignment(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Arches that don't want to expose struct resource to userland as-is in
|
|
* sysfs and /proc can implement their own pci_resource_to_user().
|
|
*/
|
|
void __weak pci_resource_to_user(const struct pci_dev *dev, int bar,
|
|
const struct resource *rsrc,
|
|
resource_size_t *start, resource_size_t *end)
|
|
{
|
|
*start = rsrc->start;
|
|
*end = rsrc->end;
|
|
}
|
|
|
|
static char *resource_alignment_param;
|
|
static DEFINE_SPINLOCK(resource_alignment_lock);
|
|
|
|
/**
|
|
* pci_specified_resource_alignment - get resource alignment specified by user.
|
|
* @dev: the PCI device to get
|
|
* @resize: whether or not to change resources' size when reassigning alignment
|
|
*
|
|
* RETURNS: Resource alignment if it is specified.
|
|
* Zero if it is not specified.
|
|
*/
|
|
static resource_size_t pci_specified_resource_alignment(struct pci_dev *dev,
|
|
bool *resize)
|
|
{
|
|
int align_order, count;
|
|
resource_size_t align = pcibios_default_alignment();
|
|
const char *p;
|
|
int ret;
|
|
|
|
spin_lock(&resource_alignment_lock);
|
|
p = resource_alignment_param;
|
|
if (!p || !*p)
|
|
goto out;
|
|
if (pci_has_flag(PCI_PROBE_ONLY)) {
|
|
align = 0;
|
|
pr_info_once("PCI: Ignoring requested alignments (PCI_PROBE_ONLY)\n");
|
|
goto out;
|
|
}
|
|
|
|
while (*p) {
|
|
count = 0;
|
|
if (sscanf(p, "%d%n", &align_order, &count) == 1 &&
|
|
p[count] == '@') {
|
|
p += count + 1;
|
|
if (align_order > 63) {
|
|
pr_err("PCI: Invalid requested alignment (order %d)\n",
|
|
align_order);
|
|
align_order = PAGE_SHIFT;
|
|
}
|
|
} else {
|
|
align_order = PAGE_SHIFT;
|
|
}
|
|
|
|
ret = pci_dev_str_match(dev, p, &p);
|
|
if (ret == 1) {
|
|
*resize = true;
|
|
align = 1ULL << align_order;
|
|
break;
|
|
} else if (ret < 0) {
|
|
pr_err("PCI: Can't parse resource_alignment parameter: %s\n",
|
|
p);
|
|
break;
|
|
}
|
|
|
|
if (*p != ';' && *p != ',') {
|
|
/* End of param or invalid format */
|
|
break;
|
|
}
|
|
p++;
|
|
}
|
|
out:
|
|
spin_unlock(&resource_alignment_lock);
|
|
return align;
|
|
}
|
|
|
|
static void pci_request_resource_alignment(struct pci_dev *dev, int bar,
|
|
resource_size_t align, bool resize)
|
|
{
|
|
struct resource *r = &dev->resource[bar];
|
|
resource_size_t size;
|
|
|
|
if (!(r->flags & IORESOURCE_MEM))
|
|
return;
|
|
|
|
if (r->flags & IORESOURCE_PCI_FIXED) {
|
|
pci_info(dev, "BAR%d %pR: ignoring requested alignment %#llx\n",
|
|
bar, r, (unsigned long long)align);
|
|
return;
|
|
}
|
|
|
|
size = resource_size(r);
|
|
if (size >= align)
|
|
return;
|
|
|
|
/*
|
|
* Increase the alignment of the resource. There are two ways we
|
|
* can do this:
|
|
*
|
|
* 1) Increase the size of the resource. BARs are aligned on their
|
|
* size, so when we reallocate space for this resource, we'll
|
|
* allocate it with the larger alignment. This also prevents
|
|
* assignment of any other BARs inside the alignment region, so
|
|
* if we're requesting page alignment, this means no other BARs
|
|
* will share the page.
|
|
*
|
|
* The disadvantage is that this makes the resource larger than
|
|
* the hardware BAR, which may break drivers that compute things
|
|
* based on the resource size, e.g., to find registers at a
|
|
* fixed offset before the end of the BAR.
|
|
*
|
|
* 2) Retain the resource size, but use IORESOURCE_STARTALIGN and
|
|
* set r->start to the desired alignment. By itself this
|
|
* doesn't prevent other BARs being put inside the alignment
|
|
* region, but if we realign *every* resource of every device in
|
|
* the system, none of them will share an alignment region.
|
|
*
|
|
* When the user has requested alignment for only some devices via
|
|
* the "pci=resource_alignment" argument, "resize" is true and we
|
|
* use the first method. Otherwise we assume we're aligning all
|
|
* devices and we use the second.
|
|
*/
|
|
|
|
pci_info(dev, "BAR%d %pR: requesting alignment to %#llx\n",
|
|
bar, r, (unsigned long long)align);
|
|
|
|
if (resize) {
|
|
r->start = 0;
|
|
r->end = align - 1;
|
|
} else {
|
|
r->flags &= ~IORESOURCE_SIZEALIGN;
|
|
r->flags |= IORESOURCE_STARTALIGN;
|
|
r->start = align;
|
|
r->end = r->start + size - 1;
|
|
}
|
|
r->flags |= IORESOURCE_UNSET;
|
|
}
|
|
|
|
/*
|
|
* This function disables memory decoding and releases memory resources
|
|
* of the device specified by kernel's boot parameter 'pci=resource_alignment='.
|
|
* It also rounds up size to specified alignment.
|
|
* Later on, the kernel will assign page-aligned memory resource back
|
|
* to the device.
|
|
*/
|
|
void pci_reassigndev_resource_alignment(struct pci_dev *dev)
|
|
{
|
|
int i;
|
|
struct resource *r;
|
|
resource_size_t align;
|
|
u16 command;
|
|
bool resize = false;
|
|
|
|
/*
|
|
* VF BARs are read-only zero according to SR-IOV spec r1.1, sec
|
|
* 3.4.1.11. Their resources are allocated from the space
|
|
* described by the VF BARx register in the PF's SR-IOV capability.
|
|
* We can't influence their alignment here.
|
|
*/
|
|
if (dev->is_virtfn)
|
|
return;
|
|
|
|
/* check if specified PCI is target device to reassign */
|
|
align = pci_specified_resource_alignment(dev, &resize);
|
|
if (!align)
|
|
return;
|
|
|
|
if (dev->hdr_type == PCI_HEADER_TYPE_NORMAL &&
|
|
(dev->class >> 8) == PCI_CLASS_BRIDGE_HOST) {
|
|
pci_warn(dev, "Can't reassign resources to host bridge\n");
|
|
return;
|
|
}
|
|
|
|
pci_read_config_word(dev, PCI_COMMAND, &command);
|
|
command &= ~PCI_COMMAND_MEMORY;
|
|
pci_write_config_word(dev, PCI_COMMAND, command);
|
|
|
|
for (i = 0; i <= PCI_ROM_RESOURCE; i++)
|
|
pci_request_resource_alignment(dev, i, align, resize);
|
|
|
|
/*
|
|
* Need to disable bridge's resource window,
|
|
* to enable the kernel to reassign new resource
|
|
* window later on.
|
|
*/
|
|
if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
|
|
for (i = PCI_BRIDGE_RESOURCES; i < PCI_NUM_RESOURCES; i++) {
|
|
r = &dev->resource[i];
|
|
if (!(r->flags & IORESOURCE_MEM))
|
|
continue;
|
|
r->flags |= IORESOURCE_UNSET;
|
|
r->end = resource_size(r) - 1;
|
|
r->start = 0;
|
|
}
|
|
pci_disable_bridge_window(dev);
|
|
}
|
|
}
|
|
|
|
static ssize_t resource_alignment_show(struct bus_type *bus, char *buf)
|
|
{
|
|
size_t count = 0;
|
|
|
|
spin_lock(&resource_alignment_lock);
|
|
if (resource_alignment_param)
|
|
count = sysfs_emit(buf, "%s\n", resource_alignment_param);
|
|
spin_unlock(&resource_alignment_lock);
|
|
|
|
return count;
|
|
}
|
|
|
|
static ssize_t resource_alignment_store(struct bus_type *bus,
|
|
const char *buf, size_t count)
|
|
{
|
|
char *param, *old, *end;
|
|
|
|
if (count >= (PAGE_SIZE - 1))
|
|
return -EINVAL;
|
|
|
|
param = kstrndup(buf, count, GFP_KERNEL);
|
|
if (!param)
|
|
return -ENOMEM;
|
|
|
|
end = strchr(param, '\n');
|
|
if (end)
|
|
*end = '\0';
|
|
|
|
spin_lock(&resource_alignment_lock);
|
|
old = resource_alignment_param;
|
|
if (strlen(param)) {
|
|
resource_alignment_param = param;
|
|
} else {
|
|
kfree(param);
|
|
resource_alignment_param = NULL;
|
|
}
|
|
spin_unlock(&resource_alignment_lock);
|
|
|
|
kfree(old);
|
|
|
|
return count;
|
|
}
|
|
|
|
static BUS_ATTR_RW(resource_alignment);
|
|
|
|
static int __init pci_resource_alignment_sysfs_init(void)
|
|
{
|
|
return bus_create_file(&pci_bus_type,
|
|
&bus_attr_resource_alignment);
|
|
}
|
|
late_initcall(pci_resource_alignment_sysfs_init);
|
|
|
|
static void pci_no_domains(void)
|
|
{
|
|
#ifdef CONFIG_PCI_DOMAINS
|
|
pci_domains_supported = 0;
|
|
#endif
|
|
}
|
|
|
|
#ifdef CONFIG_PCI_DOMAINS_GENERIC
|
|
static DEFINE_IDA(pci_domain_nr_static_ida);
|
|
static DEFINE_IDA(pci_domain_nr_dynamic_ida);
|
|
|
|
static void of_pci_reserve_static_domain_nr(void)
|
|
{
|
|
struct device_node *np;
|
|
int domain_nr;
|
|
|
|
for_each_node_by_type(np, "pci") {
|
|
domain_nr = of_get_pci_domain_nr(np);
|
|
if (domain_nr < 0)
|
|
continue;
|
|
/*
|
|
* Permanently allocate domain_nr in dynamic_ida
|
|
* to prevent it from dynamic allocation.
|
|
*/
|
|
ida_alloc_range(&pci_domain_nr_dynamic_ida,
|
|
domain_nr, domain_nr, GFP_KERNEL);
|
|
}
|
|
}
|
|
|
|
static int of_pci_bus_find_domain_nr(struct device *parent)
|
|
{
|
|
static bool static_domains_reserved = false;
|
|
int domain_nr;
|
|
|
|
/* On the first call scan device tree for static allocations. */
|
|
if (!static_domains_reserved) {
|
|
of_pci_reserve_static_domain_nr();
|
|
static_domains_reserved = true;
|
|
}
|
|
|
|
if (parent) {
|
|
/*
|
|
* If domain is in DT, allocate it in static IDA. This
|
|
* prevents duplicate static allocations in case of errors
|
|
* in DT.
|
|
*/
|
|
domain_nr = of_get_pci_domain_nr(parent->of_node);
|
|
if (domain_nr >= 0)
|
|
return ida_alloc_range(&pci_domain_nr_static_ida,
|
|
domain_nr, domain_nr,
|
|
GFP_KERNEL);
|
|
}
|
|
|
|
/*
|
|
* If domain was not specified in DT, choose a free ID from dynamic
|
|
* allocations. All domain numbers from DT are permanently in
|
|
* dynamic allocations to prevent assigning them to other DT nodes
|
|
* without static domain.
|
|
*/
|
|
return ida_alloc(&pci_domain_nr_dynamic_ida, GFP_KERNEL);
|
|
}
|
|
|
|
static void of_pci_bus_release_domain_nr(struct pci_bus *bus, struct device *parent)
|
|
{
|
|
if (bus->domain_nr < 0)
|
|
return;
|
|
|
|
/* Release domain from IDA where it was allocated. */
|
|
if (of_get_pci_domain_nr(parent->of_node) == bus->domain_nr)
|
|
ida_free(&pci_domain_nr_static_ida, bus->domain_nr);
|
|
else
|
|
ida_free(&pci_domain_nr_dynamic_ida, bus->domain_nr);
|
|
}
|
|
|
|
int pci_bus_find_domain_nr(struct pci_bus *bus, struct device *parent)
|
|
{
|
|
return acpi_disabled ? of_pci_bus_find_domain_nr(parent) :
|
|
acpi_pci_bus_find_domain_nr(bus);
|
|
}
|
|
|
|
void pci_bus_release_domain_nr(struct pci_bus *bus, struct device *parent)
|
|
{
|
|
if (!acpi_disabled)
|
|
return;
|
|
of_pci_bus_release_domain_nr(bus, parent);
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* pci_ext_cfg_avail - can we access extended PCI config space?
|
|
*
|
|
* Returns 1 if we can access PCI extended config space (offsets
|
|
* greater than 0xff). This is the default implementation. Architecture
|
|
* implementations can override this.
|
|
*/
|
|
int __weak pci_ext_cfg_avail(void)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
void __weak pci_fixup_cardbus(struct pci_bus *bus)
|
|
{
|
|
}
|
|
EXPORT_SYMBOL(pci_fixup_cardbus);
|
|
|
|
static int __init pci_setup(char *str)
|
|
{
|
|
while (str) {
|
|
char *k = strchr(str, ',');
|
|
if (k)
|
|
*k++ = 0;
|
|
if (*str && (str = pcibios_setup(str)) && *str) {
|
|
if (!strcmp(str, "nomsi")) {
|
|
pci_no_msi();
|
|
} else if (!strncmp(str, "noats", 5)) {
|
|
pr_info("PCIe: ATS is disabled\n");
|
|
pcie_ats_disabled = true;
|
|
} else if (!strcmp(str, "noaer")) {
|
|
pci_no_aer();
|
|
} else if (!strcmp(str, "earlydump")) {
|
|
pci_early_dump = true;
|
|
} else if (!strncmp(str, "realloc=", 8)) {
|
|
pci_realloc_get_opt(str + 8);
|
|
} else if (!strncmp(str, "realloc", 7)) {
|
|
pci_realloc_get_opt("on");
|
|
} else if (!strcmp(str, "nodomains")) {
|
|
pci_no_domains();
|
|
} else if (!strncmp(str, "noari", 5)) {
|
|
pcie_ari_disabled = true;
|
|
} else if (!strncmp(str, "cbiosize=", 9)) {
|
|
pci_cardbus_io_size = memparse(str + 9, &str);
|
|
} else if (!strncmp(str, "cbmemsize=", 10)) {
|
|
pci_cardbus_mem_size = memparse(str + 10, &str);
|
|
} else if (!strncmp(str, "resource_alignment=", 19)) {
|
|
resource_alignment_param = str + 19;
|
|
} else if (!strncmp(str, "ecrc=", 5)) {
|
|
pcie_ecrc_get_policy(str + 5);
|
|
} else if (!strncmp(str, "hpiosize=", 9)) {
|
|
pci_hotplug_io_size = memparse(str + 9, &str);
|
|
} else if (!strncmp(str, "hpmmiosize=", 11)) {
|
|
pci_hotplug_mmio_size = memparse(str + 11, &str);
|
|
} else if (!strncmp(str, "hpmmioprefsize=", 15)) {
|
|
pci_hotplug_mmio_pref_size = memparse(str + 15, &str);
|
|
} else if (!strncmp(str, "hpmemsize=", 10)) {
|
|
pci_hotplug_mmio_size = memparse(str + 10, &str);
|
|
pci_hotplug_mmio_pref_size = pci_hotplug_mmio_size;
|
|
} else if (!strncmp(str, "hpbussize=", 10)) {
|
|
pci_hotplug_bus_size =
|
|
simple_strtoul(str + 10, &str, 0);
|
|
if (pci_hotplug_bus_size > 0xff)
|
|
pci_hotplug_bus_size = DEFAULT_HOTPLUG_BUS_SIZE;
|
|
} else if (!strncmp(str, "pcie_bus_tune_off", 17)) {
|
|
pcie_bus_config = PCIE_BUS_TUNE_OFF;
|
|
} else if (!strncmp(str, "pcie_bus_safe", 13)) {
|
|
pcie_bus_config = PCIE_BUS_SAFE;
|
|
} else if (!strncmp(str, "pcie_bus_perf", 13)) {
|
|
pcie_bus_config = PCIE_BUS_PERFORMANCE;
|
|
} else if (!strncmp(str, "pcie_bus_peer2peer", 18)) {
|
|
pcie_bus_config = PCIE_BUS_PEER2PEER;
|
|
} else if (!strncmp(str, "pcie_scan_all", 13)) {
|
|
pci_add_flags(PCI_SCAN_ALL_PCIE_DEVS);
|
|
} else if (!strncmp(str, "disable_acs_redir=", 18)) {
|
|
disable_acs_redir_param = str + 18;
|
|
} else {
|
|
pr_err("PCI: Unknown option `%s'\n", str);
|
|
}
|
|
}
|
|
str = k;
|
|
}
|
|
return 0;
|
|
}
|
|
early_param("pci", pci_setup);
|
|
|
|
/*
|
|
* 'resource_alignment_param' and 'disable_acs_redir_param' are initialized
|
|
* in pci_setup(), above, to point to data in the __initdata section which
|
|
* will be freed after the init sequence is complete. We can't allocate memory
|
|
* in pci_setup() because some architectures do not have any memory allocation
|
|
* service available during an early_param() call. So we allocate memory and
|
|
* copy the variable here before the init section is freed.
|
|
*
|
|
*/
|
|
static int __init pci_realloc_setup_params(void)
|
|
{
|
|
resource_alignment_param = kstrdup(resource_alignment_param,
|
|
GFP_KERNEL);
|
|
disable_acs_redir_param = kstrdup(disable_acs_redir_param, GFP_KERNEL);
|
|
|
|
return 0;
|
|
}
|
|
pure_initcall(pci_realloc_setup_params);
|