1 // SPDX-License-Identifier: GPL-2.0-only
2 /******************************************************************************
5 * Xen platform PCI device driver
7 * Authors: ssmith@xensource.com and stefano.stabellini@eu.citrix.com
9 * Copyright (c) 2005, Intel Corporation.
10 * Copyright (c) 2007, XenSource Inc.
11 * Copyright (c) 2010, Citrix
15 #include <linux/interrupt.h>
17 #include <linux/init.h>
18 #include <linux/pci.h>
20 #include <xen/platform_pci.h>
21 #include <xen/grant_table.h>
22 #include <xen/xenbus.h>
23 #include <xen/events.h>
25 #include <xen/xen-ops.h>
27 #define DRV_NAME "xen-platform-pci"
29 static unsigned long platform_mmio;
30 static unsigned long platform_mmio_alloc;
31 static unsigned long platform_mmiolen;
32 static uint64_t callback_via;
34 static unsigned long alloc_xen_mmio(unsigned long len)
38 addr = platform_mmio + platform_mmio_alloc;
39 platform_mmio_alloc += len;
40 BUG_ON(platform_mmio_alloc > platform_mmiolen);
45 static uint64_t get_callback_via(struct pci_dev *pdev)
52 return irq; /* ISA IRQ */
56 /* We don't know the GSI. Specify the PCI INTx line instead. */
57 return ((uint64_t)HVM_PARAM_CALLBACK_TYPE_PCI_INTX <<
58 HVM_CALLBACK_VIA_TYPE_SHIFT) |
59 ((uint64_t)pci_domain_nr(pdev->bus) << 32) |
60 ((uint64_t)pdev->bus->number << 16) |
61 ((uint64_t)(pdev->devfn & 0xff) << 8) |
62 ((uint64_t)(pin - 1) & 3);
65 static irqreturn_t do_hvm_evtchn_intr(int irq, void *dev_id)
67 xen_hvm_evtchn_do_upcall();
71 static int xen_allocate_irq(struct pci_dev *pdev)
73 return request_irq(pdev->irq, do_hvm_evtchn_intr,
74 IRQF_NOBALANCING | IRQF_TRIGGER_RISING,
75 "xen-platform-pci", pdev);
78 static int platform_pci_resume(struct device *dev)
82 if (xen_have_vector_callback)
85 err = xen_set_callback_via(callback_via);
87 dev_err(dev, "platform_pci_resume failure!\n");
93 static int platform_pci_probe(struct pci_dev *pdev,
94 const struct pci_device_id *ent)
98 long mmio_addr, mmio_len;
99 unsigned int max_nr_gframes;
100 unsigned long grant_frames;
105 i = pci_enable_device(pdev);
109 ioaddr = pci_resource_start(pdev, 0);
111 mmio_addr = pci_resource_start(pdev, 1);
112 mmio_len = pci_resource_len(pdev, 1);
114 if (mmio_addr == 0 || ioaddr == 0) {
115 dev_err(&pdev->dev, "no resources found\n");
120 ret = pci_request_region(pdev, 1, DRV_NAME);
124 ret = pci_request_region(pdev, 0, DRV_NAME);
128 platform_mmio = mmio_addr;
129 platform_mmiolen = mmio_len;
130 if (!xen_have_vector_callback) {
131 ret = xen_allocate_irq(pdev);
133 dev_warn(&pdev->dev, "request_irq failed err=%d\n", ret);
137 * It doesn't strictly *have* to run on CPU0 but it sure
138 * as hell better process the event channel ports delivered
141 irq_set_affinity(pdev->irq, cpumask_of(0));
143 callback_via = get_callback_via(pdev);
144 ret = xen_set_callback_via(callback_via);
146 dev_warn(&pdev->dev, "Unable to set the evtchn callback "
152 max_nr_gframes = gnttab_max_grant_frames();
153 grant_frames = alloc_xen_mmio(PAGE_SIZE * max_nr_gframes);
154 ret = gnttab_setup_auto_xlat_frames(grant_frames);
162 gnttab_free_auto_xlat_frames();
164 if (!xen_have_vector_callback)
165 free_irq(pdev->irq, pdev);
167 pci_release_region(pdev, 0);
169 pci_release_region(pdev, 1);
171 pci_disable_device(pdev);
175 static const struct pci_device_id platform_pci_tbl[] = {
176 {PCI_VENDOR_ID_XEN, PCI_DEVICE_ID_XEN_PLATFORM,
177 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
181 static const struct dev_pm_ops platform_pm_ops = {
182 .resume_noirq = platform_pci_resume,
185 static struct pci_driver platform_driver = {
187 .probe = platform_pci_probe,
188 .id_table = platform_pci_tbl,
190 .pm = &platform_pm_ops,
194 builtin_pci_driver(platform_driver);