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2d9d6f6c9e
We want to use the dma_direct_ namespace for a generic implementation, so rename powerpc to the second best choice: dma_nommu_. Signed-off-by: Christoph Hellwig <hch@lst.de>
322 lines
7.4 KiB
C
322 lines
7.4 KiB
C
/*
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* Copyright 2014 IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/pci.h>
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#include <misc/cxl.h>
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#include <asm/pnv-pci.h>
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#include "cxl.h"
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static int cxl_dma_set_mask(struct pci_dev *pdev, u64 dma_mask)
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{
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if (dma_mask < DMA_BIT_MASK(64)) {
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pr_info("%s only 64bit DMA supported on CXL", __func__);
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return -EIO;
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}
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*(pdev->dev.dma_mask) = dma_mask;
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return 0;
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}
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static int cxl_pci_probe_mode(struct pci_bus *bus)
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{
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return PCI_PROBE_NORMAL;
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}
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static int cxl_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
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{
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return -ENODEV;
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}
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static void cxl_teardown_msi_irqs(struct pci_dev *pdev)
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{
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/*
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* MSI should never be set but need still need to provide this call
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* back.
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*/
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}
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static bool cxl_pci_enable_device_hook(struct pci_dev *dev)
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{
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struct pci_controller *phb;
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struct cxl_afu *afu;
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phb = pci_bus_to_host(dev->bus);
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afu = (struct cxl_afu *)phb->private_data;
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if (!cxl_ops->link_ok(afu->adapter, afu)) {
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dev_warn(&dev->dev, "%s: Device link is down, refusing to enable AFU\n", __func__);
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return false;
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}
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set_dma_ops(&dev->dev, &dma_nommu_ops);
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set_dma_offset(&dev->dev, PAGE_OFFSET);
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return _cxl_pci_associate_default_context(dev, afu);
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}
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static resource_size_t cxl_pci_window_alignment(struct pci_bus *bus,
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unsigned long type)
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{
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return 1;
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}
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static void cxl_pci_reset_secondary_bus(struct pci_dev *dev)
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{
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/* Should we do an AFU reset here ? */
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}
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static int cxl_pcie_cfg_record(u8 bus, u8 devfn)
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{
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return (bus << 8) + devfn;
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}
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static inline struct cxl_afu *pci_bus_to_afu(struct pci_bus *bus)
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{
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struct pci_controller *phb = bus ? pci_bus_to_host(bus) : NULL;
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return phb ? phb->private_data : NULL;
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}
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static void cxl_afu_configured_put(struct cxl_afu *afu)
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{
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atomic_dec_if_positive(&afu->configured_state);
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}
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static bool cxl_afu_configured_get(struct cxl_afu *afu)
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{
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return atomic_inc_unless_negative(&afu->configured_state);
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}
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static inline int cxl_pcie_config_info(struct pci_bus *bus, unsigned int devfn,
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struct cxl_afu *afu, int *_record)
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{
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int record;
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record = cxl_pcie_cfg_record(bus->number, devfn);
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if (record > afu->crs_num)
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return PCIBIOS_DEVICE_NOT_FOUND;
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*_record = record;
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return 0;
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}
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static int cxl_pcie_read_config(struct pci_bus *bus, unsigned int devfn,
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int offset, int len, u32 *val)
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{
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int rc, record;
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struct cxl_afu *afu;
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u8 val8;
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u16 val16;
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u32 val32;
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afu = pci_bus_to_afu(bus);
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/* Grab a reader lock on afu. */
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if (afu == NULL || !cxl_afu_configured_get(afu))
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return PCIBIOS_DEVICE_NOT_FOUND;
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rc = cxl_pcie_config_info(bus, devfn, afu, &record);
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if (rc)
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goto out;
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switch (len) {
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case 1:
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rc = cxl_ops->afu_cr_read8(afu, record, offset, &val8);
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*val = val8;
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break;
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case 2:
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rc = cxl_ops->afu_cr_read16(afu, record, offset, &val16);
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*val = val16;
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break;
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case 4:
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rc = cxl_ops->afu_cr_read32(afu, record, offset, &val32);
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*val = val32;
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break;
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default:
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WARN_ON(1);
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}
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out:
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cxl_afu_configured_put(afu);
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return rc ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
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}
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static int cxl_pcie_write_config(struct pci_bus *bus, unsigned int devfn,
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int offset, int len, u32 val)
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{
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int rc, record;
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struct cxl_afu *afu;
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afu = pci_bus_to_afu(bus);
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/* Grab a reader lock on afu. */
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if (afu == NULL || !cxl_afu_configured_get(afu))
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return PCIBIOS_DEVICE_NOT_FOUND;
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rc = cxl_pcie_config_info(bus, devfn, afu, &record);
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if (rc)
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goto out;
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switch (len) {
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case 1:
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rc = cxl_ops->afu_cr_write8(afu, record, offset, val & 0xff);
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break;
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case 2:
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rc = cxl_ops->afu_cr_write16(afu, record, offset, val & 0xffff);
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break;
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case 4:
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rc = cxl_ops->afu_cr_write32(afu, record, offset, val);
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break;
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default:
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WARN_ON(1);
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}
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out:
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cxl_afu_configured_put(afu);
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return rc ? PCIBIOS_SET_FAILED : PCIBIOS_SUCCESSFUL;
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}
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static struct pci_ops cxl_pcie_pci_ops =
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{
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.read = cxl_pcie_read_config,
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.write = cxl_pcie_write_config,
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};
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static struct pci_controller_ops cxl_pci_controller_ops =
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{
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.probe_mode = cxl_pci_probe_mode,
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.enable_device_hook = cxl_pci_enable_device_hook,
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.disable_device = _cxl_pci_disable_device,
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.release_device = _cxl_pci_disable_device,
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.window_alignment = cxl_pci_window_alignment,
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.reset_secondary_bus = cxl_pci_reset_secondary_bus,
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.setup_msi_irqs = cxl_setup_msi_irqs,
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.teardown_msi_irqs = cxl_teardown_msi_irqs,
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.dma_set_mask = cxl_dma_set_mask,
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};
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int cxl_pci_vphb_add(struct cxl_afu *afu)
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{
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struct pci_controller *phb;
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struct device_node *vphb_dn;
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struct device *parent;
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/*
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* If there are no AFU configuration records we won't have anything to
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* expose under the vPHB, so skip creating one, returning success since
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* this is still a valid case. This will also opt us out of EEH
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* handling since we won't have anything special to do if there are no
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* kernel drivers attached to the vPHB, and EEH handling is not yet
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* supported in the peer model.
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*/
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if (!afu->crs_num)
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return 0;
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/* The parent device is the adapter. Reuse the device node of
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* the adapter.
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* We don't seem to care what device node is used for the vPHB,
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* but tools such as lsvpd walk up the device parents looking
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* for a valid location code, so we might as well show devices
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* attached to the adapter as being located on that adapter.
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*/
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parent = afu->adapter->dev.parent;
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vphb_dn = parent->of_node;
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/* Alloc and setup PHB data structure */
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phb = pcibios_alloc_controller(vphb_dn);
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if (!phb)
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return -ENODEV;
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/* Setup parent in sysfs */
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phb->parent = parent;
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/* Setup the PHB using arch provided callback */
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phb->ops = &cxl_pcie_pci_ops;
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phb->cfg_addr = NULL;
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phb->cfg_data = NULL;
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phb->private_data = afu;
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phb->controller_ops = cxl_pci_controller_ops;
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/* Scan the bus */
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pcibios_scan_phb(phb);
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if (phb->bus == NULL)
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return -ENXIO;
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/* Set release hook on root bus */
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pci_set_host_bridge_release(to_pci_host_bridge(phb->bus->bridge),
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pcibios_free_controller_deferred,
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(void *) phb);
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/* Claim resources. This might need some rework as well depending
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* whether we are doing probe-only or not, like assigning unassigned
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* resources etc...
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*/
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pcibios_claim_one_bus(phb->bus);
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/* Add probed PCI devices to the device model */
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pci_bus_add_devices(phb->bus);
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afu->phb = phb;
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return 0;
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}
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void cxl_pci_vphb_remove(struct cxl_afu *afu)
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{
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struct pci_controller *phb;
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/* If there is no configuration record we won't have one of these */
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if (!afu || !afu->phb)
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return;
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phb = afu->phb;
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afu->phb = NULL;
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pci_remove_root_bus(phb->bus);
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/*
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* We don't free phb here - that's handled by
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* pcibios_free_controller_deferred()
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*/
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}
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static bool _cxl_pci_is_vphb_device(struct pci_controller *phb)
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{
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return (phb->ops == &cxl_pcie_pci_ops);
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}
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bool cxl_pci_is_vphb_device(struct pci_dev *dev)
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{
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struct pci_controller *phb;
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phb = pci_bus_to_host(dev->bus);
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return _cxl_pci_is_vphb_device(phb);
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}
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struct cxl_afu *cxl_pci_to_afu(struct pci_dev *dev)
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{
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struct pci_controller *phb;
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phb = pci_bus_to_host(dev->bus);
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if (_cxl_pci_is_vphb_device(phb))
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return (struct cxl_afu *)phb->private_data;
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if (pnv_pci_on_cxl_phb(dev))
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return pnv_cxl_phb_to_afu(phb);
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return ERR_PTR(-ENODEV);
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}
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EXPORT_SYMBOL_GPL(cxl_pci_to_afu);
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unsigned int cxl_pci_to_cfg_record(struct pci_dev *dev)
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{
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return cxl_pcie_cfg_record(dev->bus->number, dev->devfn);
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}
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EXPORT_SYMBOL_GPL(cxl_pci_to_cfg_record);
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