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77b84bb306
Convert xen-platform from the legacy PCI power management callbacks to the generic operations. This is one step towards removing support for the legacy PCI callbacks. The generic .resume_noirq() operation is called by pci_pm_resume_noirq() at the same point the legacy PCI .resume_early() callback was, so this patch should not change the xen-platform behavior. Link: https://lore.kernel.org/r/20191101204558.210235-5-helgaas@kernel.org Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Cc: Stefano Stabellini <sstabellini@kernel.org> Cc: KarimAllah Ahmed <karahmed@amazon.de>
185 lines
4.0 KiB
C
185 lines
4.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/******************************************************************************
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* platform-pci.c
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*
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* Xen platform PCI device driver
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*
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* Authors: ssmith@xensource.com and stefano.stabellini@eu.citrix.com
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*
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* Copyright (c) 2005, Intel Corporation.
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* Copyright (c) 2007, XenSource Inc.
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* Copyright (c) 2010, Citrix
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*/
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <xen/platform_pci.h>
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#include <xen/grant_table.h>
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#include <xen/xenbus.h>
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#include <xen/events.h>
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#include <xen/hvm.h>
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#include <xen/xen-ops.h>
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#define DRV_NAME "xen-platform-pci"
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static unsigned long platform_mmio;
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static unsigned long platform_mmio_alloc;
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static unsigned long platform_mmiolen;
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static uint64_t callback_via;
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static unsigned long alloc_xen_mmio(unsigned long len)
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{
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unsigned long addr;
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addr = platform_mmio + platform_mmio_alloc;
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platform_mmio_alloc += len;
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BUG_ON(platform_mmio_alloc > platform_mmiolen);
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return addr;
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}
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static uint64_t get_callback_via(struct pci_dev *pdev)
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{
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u8 pin;
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int irq;
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irq = pdev->irq;
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if (irq < 16)
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return irq; /* ISA IRQ */
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pin = pdev->pin;
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/* We don't know the GSI. Specify the PCI INTx line instead. */
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return ((uint64_t)0x01 << HVM_CALLBACK_VIA_TYPE_SHIFT) | /* PCI INTx identifier */
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((uint64_t)pci_domain_nr(pdev->bus) << 32) |
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((uint64_t)pdev->bus->number << 16) |
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((uint64_t)(pdev->devfn & 0xff) << 8) |
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((uint64_t)(pin - 1) & 3);
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}
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static irqreturn_t do_hvm_evtchn_intr(int irq, void *dev_id)
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{
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xen_hvm_evtchn_do_upcall();
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return IRQ_HANDLED;
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}
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static int xen_allocate_irq(struct pci_dev *pdev)
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{
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return request_irq(pdev->irq, do_hvm_evtchn_intr,
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IRQF_NOBALANCING | IRQF_TRIGGER_RISING,
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"xen-platform-pci", pdev);
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}
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static int platform_pci_resume(struct device *dev)
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{
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int err;
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if (xen_have_vector_callback)
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return 0;
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err = xen_set_callback_via(callback_via);
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if (err) {
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dev_err(dev, "platform_pci_resume failure!\n");
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return err;
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}
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return 0;
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}
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static int platform_pci_probe(struct pci_dev *pdev,
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const struct pci_device_id *ent)
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{
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int i, ret;
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long ioaddr;
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long mmio_addr, mmio_len;
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unsigned int max_nr_gframes;
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unsigned long grant_frames;
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if (!xen_domain())
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return -ENODEV;
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i = pci_enable_device(pdev);
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if (i)
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return i;
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ioaddr = pci_resource_start(pdev, 0);
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mmio_addr = pci_resource_start(pdev, 1);
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mmio_len = pci_resource_len(pdev, 1);
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if (mmio_addr == 0 || ioaddr == 0) {
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dev_err(&pdev->dev, "no resources found\n");
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ret = -ENOENT;
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goto pci_out;
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}
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ret = pci_request_region(pdev, 1, DRV_NAME);
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if (ret < 0)
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goto pci_out;
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ret = pci_request_region(pdev, 0, DRV_NAME);
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if (ret < 0)
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goto mem_out;
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platform_mmio = mmio_addr;
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platform_mmiolen = mmio_len;
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if (!xen_have_vector_callback) {
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ret = xen_allocate_irq(pdev);
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if (ret) {
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dev_warn(&pdev->dev, "request_irq failed err=%d\n", ret);
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goto out;
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}
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callback_via = get_callback_via(pdev);
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ret = xen_set_callback_via(callback_via);
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if (ret) {
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dev_warn(&pdev->dev, "Unable to set the evtchn callback "
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"err=%d\n", ret);
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goto out;
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}
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}
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max_nr_gframes = gnttab_max_grant_frames();
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grant_frames = alloc_xen_mmio(PAGE_SIZE * max_nr_gframes);
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ret = gnttab_setup_auto_xlat_frames(grant_frames);
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if (ret)
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goto out;
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ret = gnttab_init();
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if (ret)
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goto grant_out;
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xenbus_probe(NULL);
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return 0;
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grant_out:
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gnttab_free_auto_xlat_frames();
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out:
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pci_release_region(pdev, 0);
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mem_out:
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pci_release_region(pdev, 1);
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pci_out:
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pci_disable_device(pdev);
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return ret;
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}
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static const struct pci_device_id platform_pci_tbl[] = {
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{PCI_VENDOR_ID_XEN, PCI_DEVICE_ID_XEN_PLATFORM,
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PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
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{0,}
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};
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static struct dev_pm_ops platform_pm_ops = {
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.resume_noirq = platform_pci_resume,
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};
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static struct pci_driver platform_driver = {
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.name = DRV_NAME,
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.probe = platform_pci_probe,
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.id_table = platform_pci_tbl,
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.driver = {
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.pm = &platform_pm_ops,
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},
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};
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builtin_pci_driver(platform_driver);
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