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20#include <linux/pci.h>
21#include <linux/acpi.h>
22#include <xen/xen.h>
23#include <xen/interface/physdev.h>
24#include <xen/interface/xen.h>
25
26#include <asm/xen/hypervisor.h>
27#include <asm/xen/hypercall.h>
28#include "../pci/pci.h"
29
30static bool __read_mostly pci_seg_supported = true;
31
32static int xen_add_device(struct device *dev)
33{
34 int r;
35 struct pci_dev *pci_dev = to_pci_dev(dev);
36#ifdef CONFIG_PCI_IOV
37 struct pci_dev *physfn = pci_dev->physfn;
38#endif
39
40 if (pci_seg_supported) {
41 struct physdev_pci_device_add add = {
42 .seg = pci_domain_nr(pci_dev->bus),
43 .bus = pci_dev->bus->number,
44 .devfn = pci_dev->devfn
45 };
46#ifdef CONFIG_ACPI
47 acpi_handle handle;
48#endif
49
50#ifdef CONFIG_PCI_IOV
51 if (pci_dev->is_virtfn) {
52 add.flags = XEN_PCI_DEV_VIRTFN;
53 add.physfn.bus = physfn->bus->number;
54 add.physfn.devfn = physfn->devfn;
55 } else
56#endif
57 if (pci_ari_enabled(pci_dev->bus) && PCI_SLOT(pci_dev->devfn))
58 add.flags = XEN_PCI_DEV_EXTFN;
59
60#ifdef CONFIG_ACPI
61 handle = DEVICE_ACPI_HANDLE(&pci_dev->dev);
62 if (!handle && pci_dev->bus->bridge)
63 handle = DEVICE_ACPI_HANDLE(pci_dev->bus->bridge);
64#ifdef CONFIG_PCI_IOV
65 if (!handle && pci_dev->is_virtfn)
66 handle = DEVICE_ACPI_HANDLE(physfn->bus->bridge);
67#endif
68 if (handle) {
69 acpi_status status;
70
71 do {
72 unsigned long long pxm;
73
74 status = acpi_evaluate_integer(handle, "_PXM",
75 NULL, &pxm);
76 if (ACPI_SUCCESS(status)) {
77 add.optarr[0] = pxm;
78 add.flags |= XEN_PCI_DEV_PXM;
79 break;
80 }
81 status = acpi_get_parent(handle, &handle);
82 } while (ACPI_SUCCESS(status));
83 }
84#endif
85
86 r = HYPERVISOR_physdev_op(PHYSDEVOP_pci_device_add, &add);
87 if (r != -ENOSYS)
88 return r;
89 pci_seg_supported = false;
90 }
91
92 if (pci_domain_nr(pci_dev->bus))
93 r = -ENOSYS;
94#ifdef CONFIG_PCI_IOV
95 else if (pci_dev->is_virtfn) {
96 struct physdev_manage_pci_ext manage_pci_ext = {
97 .bus = pci_dev->bus->number,
98 .devfn = pci_dev->devfn,
99 .is_virtfn = 1,
100 .physfn.bus = physfn->bus->number,
101 .physfn.devfn = physfn->devfn,
102 };
103
104 r = HYPERVISOR_physdev_op(PHYSDEVOP_manage_pci_add_ext,
105 &manage_pci_ext);
106 }
107#endif
108 else if (pci_ari_enabled(pci_dev->bus) && PCI_SLOT(pci_dev->devfn)) {
109 struct physdev_manage_pci_ext manage_pci_ext = {
110 .bus = pci_dev->bus->number,
111 .devfn = pci_dev->devfn,
112 .is_extfn = 1,
113 };
114
115 r = HYPERVISOR_physdev_op(PHYSDEVOP_manage_pci_add_ext,
116 &manage_pci_ext);
117 } else {
118 struct physdev_manage_pci manage_pci = {
119 .bus = pci_dev->bus->number,
120 .devfn = pci_dev->devfn,
121 };
122
123 r = HYPERVISOR_physdev_op(PHYSDEVOP_manage_pci_add,
124 &manage_pci);
125 }
126
127 return r;
128}
129
130static int xen_remove_device(struct device *dev)
131{
132 int r;
133 struct pci_dev *pci_dev = to_pci_dev(dev);
134
135 if (pci_seg_supported) {
136 struct physdev_pci_device device = {
137 .seg = pci_domain_nr(pci_dev->bus),
138 .bus = pci_dev->bus->number,
139 .devfn = pci_dev->devfn
140 };
141
142 r = HYPERVISOR_physdev_op(PHYSDEVOP_pci_device_remove,
143 &device);
144 } else if (pci_domain_nr(pci_dev->bus))
145 r = -ENOSYS;
146 else {
147 struct physdev_manage_pci manage_pci = {
148 .bus = pci_dev->bus->number,
149 .devfn = pci_dev->devfn
150 };
151
152 r = HYPERVISOR_physdev_op(PHYSDEVOP_manage_pci_remove,
153 &manage_pci);
154 }
155
156 return r;
157}
158
159static int xen_pci_notifier(struct notifier_block *nb,
160 unsigned long action, void *data)
161{
162 struct device *dev = data;
163 int r = 0;
164
165 switch (action) {
166 case BUS_NOTIFY_ADD_DEVICE:
167 r = xen_add_device(dev);
168 break;
169 case BUS_NOTIFY_DEL_DEVICE:
170 r = xen_remove_device(dev);
171 break;
172 default:
173 return NOTIFY_DONE;
174 }
175 if (r)
176 dev_err(dev, "Failed to %s - passthrough or MSI/MSI-X might fail!\n",
177 action == BUS_NOTIFY_ADD_DEVICE ? "add" :
178 (action == BUS_NOTIFY_DEL_DEVICE ? "delete" : "?"));
179 return NOTIFY_OK;
180}
181
182static struct notifier_block device_nb = {
183 .notifier_call = xen_pci_notifier,
184};
185
186static int __init register_xen_pci_notifier(void)
187{
188 if (!xen_initial_domain())
189 return 0;
190
191 return bus_register_notifier(&pci_bus_type, &device_nb);
192}
193
194arch_initcall(register_xen_pci_notifier);
195
