1/*
2 * Copyright (c) 2009, Intel Corporation.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
15 * Place - Suite 330, Boston, MA 02111-1307 USA.
16 *
17 * Author: Weidong Han <weidong.han@intel.com>
18 */
19
20#include <linux/pci.h>
21#include <linux/acpi.h>
22#include <linux/pci-acpi.h>
23#include <xen/xen.h>
24#include <xen/interface/physdev.h>
25#include <xen/interface/xen.h>
26
27#include <asm/xen/hypervisor.h>
28#include <asm/xen/hypercall.h>
29#include "../pci/pci.h"
30#ifdef CONFIG_PCI_MMCONFIG
31#include <asm/pci_x86.h>
32#endif
33
34static bool __read_mostly pci_seg_supported = true;
35
36static int xen_add_device(struct device *dev)
37{
38 int r;
39 struct pci_dev *pci_dev = to_pci_dev(dev);
40#ifdef CONFIG_PCI_IOV
41 struct pci_dev *physfn = pci_dev->physfn;
42#endif
43
44 if (pci_seg_supported) {
45 struct {
46 struct physdev_pci_device_add add;
47 uint32_t pxm;
48 } add_ext = {
49 .add.seg = pci_domain_nr(pci_dev->bus),
50 .add.bus = pci_dev->bus->number,
51 .add.devfn = pci_dev->devfn
52 };
53 struct physdev_pci_device_add *add = &add_ext.add;
54
55#ifdef CONFIG_ACPI
56 acpi_handle handle;
57#endif
58
59#ifdef CONFIG_PCI_IOV
60 if (pci_dev->is_virtfn) {
61 add->flags = XEN_PCI_DEV_VIRTFN;
62 add->physfn.bus = physfn->bus->number;
63 add->physfn.devfn = physfn->devfn;
64 } else
65#endif
66 if (pci_ari_enabled(pci_dev->bus) && PCI_SLOT(pci_dev->devfn))
67 add->flags = XEN_PCI_DEV_EXTFN;
68
69#ifdef CONFIG_ACPI
70 handle = ACPI_HANDLE(&pci_dev->dev);
71#ifdef CONFIG_PCI_IOV
72 if (!handle && pci_dev->is_virtfn)
73 handle = ACPI_HANDLE(physfn->bus->bridge);
74#endif
75 if (!handle) {
76 /*
77 * This device was not listed in the ACPI name space at
78 * all. Try to get acpi handle of parent pci bus.
79 */
80 struct pci_bus *pbus;
81 for (pbus = pci_dev->bus; pbus; pbus = pbus->parent) {
82 handle = acpi_pci_get_bridge_handle(pbus);
83 if (handle)
84 break;
85 }
86 }
87 if (handle) {
88 acpi_status status;
89
90 do {
91 unsigned long long pxm;
92
93 status = acpi_evaluate_integer(handle, "_PXM",
94 NULL, &pxm);
95 if (ACPI_SUCCESS(status)) {
96 add->optarr[0] = pxm;
97 add->flags |= XEN_PCI_DEV_PXM;
98 break;
99 }
100 status = acpi_get_parent(handle, &handle);
101 } while (ACPI_SUCCESS(status));
102 }
103#endif /* CONFIG_ACPI */
104
105 r = HYPERVISOR_physdev_op(PHYSDEVOP_pci_device_add, add);
106 if (r != -ENOSYS)
107 return r;
108 pci_seg_supported = false;
109 }
110
111 if (pci_domain_nr(pci_dev->bus))
112 r = -ENOSYS;
113#ifdef CONFIG_PCI_IOV
114 else if (pci_dev->is_virtfn) {
115 struct physdev_manage_pci_ext manage_pci_ext = {
116 .bus = pci_dev->bus->number,
117 .devfn = pci_dev->devfn,
118 .is_virtfn = 1,
119 .physfn.bus = physfn->bus->number,
120 .physfn.devfn = physfn->devfn,
121 };
122
123 r = HYPERVISOR_physdev_op(PHYSDEVOP_manage_pci_add_ext,
124 &manage_pci_ext);
125 }
126#endif
127 else if (pci_ari_enabled(pci_dev->bus) && PCI_SLOT(pci_dev->devfn)) {
128 struct physdev_manage_pci_ext manage_pci_ext = {
129 .bus = pci_dev->bus->number,
130 .devfn = pci_dev->devfn,
131 .is_extfn = 1,
132 };
133
134 r = HYPERVISOR_physdev_op(PHYSDEVOP_manage_pci_add_ext,
135 &manage_pci_ext);
136 } else {
137 struct physdev_manage_pci manage_pci = {
138 .bus = pci_dev->bus->number,
139 .devfn = pci_dev->devfn,
140 };
141
142 r = HYPERVISOR_physdev_op(PHYSDEVOP_manage_pci_add,
143 &manage_pci);
144 }
145
146 return r;
147}
148
149static int xen_remove_device(struct device *dev)
150{
151 int r;
152 struct pci_dev *pci_dev = to_pci_dev(dev);
153
154 if (pci_seg_supported) {
155 struct physdev_pci_device device = {
156 .seg = pci_domain_nr(pci_dev->bus),
157 .bus = pci_dev->bus->number,
158 .devfn = pci_dev->devfn
159 };
160
161 r = HYPERVISOR_physdev_op(PHYSDEVOP_pci_device_remove,
162 &device);
163 } else if (pci_domain_nr(pci_dev->bus))
164 r = -ENOSYS;
165 else {
166 struct physdev_manage_pci manage_pci = {
167 .bus = pci_dev->bus->number,
168 .devfn = pci_dev->devfn
169 };
170
171 r = HYPERVISOR_physdev_op(PHYSDEVOP_manage_pci_remove,
172 &manage_pci);
173 }
174
175 return r;
176}
177
178static int xen_pci_notifier(struct notifier_block *nb,
179 unsigned long action, void *data)
180{
181 struct device *dev = data;
182 int r = 0;
183
184 switch (action) {
185 case BUS_NOTIFY_ADD_DEVICE:
186 r = xen_add_device(dev);
187 break;
188 case BUS_NOTIFY_DEL_DEVICE:
189 r = xen_remove_device(dev);
190 break;
191 default:
192 return NOTIFY_DONE;
193 }
194 if (r)
195 dev_err(dev, "Failed to %s - passthrough or MSI/MSI-X might fail!\n",
196 action == BUS_NOTIFY_ADD_DEVICE ? "add" :
197 (action == BUS_NOTIFY_DEL_DEVICE ? "delete" : "?"));
198 return NOTIFY_OK;
199}
200
201static struct notifier_block device_nb = {
202 .notifier_call = xen_pci_notifier,
203};
204
205static int __init register_xen_pci_notifier(void)
206{
207 if (!xen_initial_domain())
208 return 0;
209
210 return bus_register_notifier(&pci_bus_type, &device_nb);
211}
212
213arch_initcall(register_xen_pci_notifier);
214
215#ifdef CONFIG_PCI_MMCONFIG
216static int __init xen_mcfg_late(void)
217{
218 struct pci_mmcfg_region *cfg;
219 int rc;
220
221 if (!xen_initial_domain())
222 return 0;
223
224 if ((pci_probe & PCI_PROBE_MMCONF) == 0)
225 return 0;
226
227 if (list_empty(&pci_mmcfg_list))
228 return 0;
229
230 /* Check whether they are in the right area. */
231 list_for_each_entry(cfg, &pci_mmcfg_list, list) {
232 struct physdev_pci_mmcfg_reserved r;
233
234 r.address = cfg->address;
235 r.segment = cfg->segment;
236 r.start_bus = cfg->start_bus;
237 r.end_bus = cfg->end_bus;
238 r.flags = XEN_PCI_MMCFG_RESERVED;
239
240 rc = HYPERVISOR_physdev_op(PHYSDEVOP_pci_mmcfg_reserved, &r);
241 switch (rc) {
242 case 0:
243 case -ENOSYS:
244 continue;
245
246 default:
247 pr_warn("Failed to report MMCONFIG reservation"
248 " state for %s to hypervisor"
249 " (%d)\n",
250 cfg->name, rc);
251 }
252 }
253 return 0;
254}
255/*
256 * Needs to be done after acpi_init which are subsys_initcall.
257 */
258subsys_initcall_sync(xen_mcfg_late);
259#endif
260