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Weidong Hane28c31a2010-10-27 17:55:04 +01001/*
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>
Jan Beulich55e901f2011-09-22 09:17:57 +010021#include <linux/acpi.h>
Weidong Hane28c31a2010-10-27 17:55:04 +010022#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"
Ben Hutchingsb7ef4a62013-12-31 20:46:27 +010029#ifdef CONFIG_PCI_MMCONFIG
Konrad Rzeszutek Wilk8deb3eb2013-10-25 16:26:02 -040030#include <asm/pci_x86.h>
Ben Hutchingsb7ef4a62013-12-31 20:46:27 +010031#endif
Weidong Hane28c31a2010-10-27 17:55:04 +010032
Jan Beulich55e901f2011-09-22 09:17:57 +010033static bool __read_mostly pci_seg_supported = true;
34
Weidong Hane28c31a2010-10-27 17:55:04 +010035static int xen_add_device(struct device *dev)
36{
37 int r;
38 struct pci_dev *pci_dev = to_pci_dev(dev);
Jan Beulich55e901f2011-09-22 09:17:57 +010039#ifdef CONFIG_PCI_IOV
40 struct pci_dev *physfn = pci_dev->physfn;
41#endif
42
43 if (pci_seg_supported) {
44 struct physdev_pci_device_add add = {
45 .seg = pci_domain_nr(pci_dev->bus),
46 .bus = pci_dev->bus->number,
47 .devfn = pci_dev->devfn
48 };
49#ifdef CONFIG_ACPI
50 acpi_handle handle;
51#endif
Weidong Hane28c31a2010-10-27 17:55:04 +010052
53#ifdef CONFIG_PCI_IOV
Jan Beulich55e901f2011-09-22 09:17:57 +010054 if (pci_dev->is_virtfn) {
55 add.flags = XEN_PCI_DEV_VIRTFN;
56 add.physfn.bus = physfn->bus->number;
57 add.physfn.devfn = physfn->devfn;
58 } else
59#endif
60 if (pci_ari_enabled(pci_dev->bus) && PCI_SLOT(pci_dev->devfn))
61 add.flags = XEN_PCI_DEV_EXTFN;
62
63#ifdef CONFIG_ACPI
Rafael J. Wysocki3a83f992013-11-14 23:17:21 +010064 handle = ACPI_HANDLE(&pci_dev->dev);
Zhang, Yang Z780dbcd2012-05-22 08:40:16 +000065 if (!handle && pci_dev->bus->bridge)
Rafael J. Wysocki3a83f992013-11-14 23:17:21 +010066 handle = ACPI_HANDLE(pci_dev->bus->bridge);
Jan Beulich55e901f2011-09-22 09:17:57 +010067#ifdef CONFIG_PCI_IOV
68 if (!handle && pci_dev->is_virtfn)
Rafael J. Wysocki3a83f992013-11-14 23:17:21 +010069 handle = ACPI_HANDLE(physfn->bus->bridge);
Jan Beulich55e901f2011-09-22 09:17:57 +010070#endif
71 if (handle) {
72 acpi_status status;
73
74 do {
75 unsigned long long pxm;
76
77 status = acpi_evaluate_integer(handle, "_PXM",
78 NULL, &pxm);
79 if (ACPI_SUCCESS(status)) {
80 add.optarr[0] = pxm;
81 add.flags |= XEN_PCI_DEV_PXM;
82 break;
83 }
84 status = acpi_get_parent(handle, &handle);
85 } while (ACPI_SUCCESS(status));
86 }
87#endif /* CONFIG_ACPI */
88
89 r = HYPERVISOR_physdev_op(PHYSDEVOP_pci_device_add, &add);
90 if (r != -ENOSYS)
91 return r;
92 pci_seg_supported = false;
93 }
94
95 if (pci_domain_nr(pci_dev->bus))
96 r = -ENOSYS;
97#ifdef CONFIG_PCI_IOV
98 else if (pci_dev->is_virtfn) {
Weidong Hane28c31a2010-10-27 17:55:04 +010099 struct physdev_manage_pci_ext manage_pci_ext = {
100 .bus = pci_dev->bus->number,
101 .devfn = pci_dev->devfn,
102 .is_virtfn = 1,
Jan Beulich55e901f2011-09-22 09:17:57 +0100103 .physfn.bus = physfn->bus->number,
104 .physfn.devfn = physfn->devfn,
Weidong Hane28c31a2010-10-27 17:55:04 +0100105 };
106
107 r = HYPERVISOR_physdev_op(PHYSDEVOP_manage_pci_add_ext,
108 &manage_pci_ext);
Jan Beulich55e901f2011-09-22 09:17:57 +0100109 }
Weidong Hane28c31a2010-10-27 17:55:04 +0100110#endif
Jan Beulich55e901f2011-09-22 09:17:57 +0100111 else if (pci_ari_enabled(pci_dev->bus) && PCI_SLOT(pci_dev->devfn)) {
Weidong Hane28c31a2010-10-27 17:55:04 +0100112 struct physdev_manage_pci_ext manage_pci_ext = {
113 .bus = pci_dev->bus->number,
114 .devfn = pci_dev->devfn,
115 .is_extfn = 1,
116 };
117
118 r = HYPERVISOR_physdev_op(PHYSDEVOP_manage_pci_add_ext,
119 &manage_pci_ext);
120 } else {
121 struct physdev_manage_pci manage_pci = {
Ruslan Pisarev4b010982011-07-26 14:16:38 +0300122 .bus = pci_dev->bus->number,
Weidong Hane28c31a2010-10-27 17:55:04 +0100123 .devfn = pci_dev->devfn,
124 };
125
126 r = HYPERVISOR_physdev_op(PHYSDEVOP_manage_pci_add,
127 &manage_pci);
128 }
129
130 return r;
131}
132
133static int xen_remove_device(struct device *dev)
134{
135 int r;
136 struct pci_dev *pci_dev = to_pci_dev(dev);
Weidong Hane28c31a2010-10-27 17:55:04 +0100137
Jan Beulich55e901f2011-09-22 09:17:57 +0100138 if (pci_seg_supported) {
139 struct physdev_pci_device device = {
140 .seg = pci_domain_nr(pci_dev->bus),
141 .bus = pci_dev->bus->number,
142 .devfn = pci_dev->devfn
143 };
Weidong Hane28c31a2010-10-27 17:55:04 +0100144
Jan Beulich55e901f2011-09-22 09:17:57 +0100145 r = HYPERVISOR_physdev_op(PHYSDEVOP_pci_device_remove,
146 &device);
147 } else if (pci_domain_nr(pci_dev->bus))
148 r = -ENOSYS;
149 else {
150 struct physdev_manage_pci manage_pci = {
151 .bus = pci_dev->bus->number,
152 .devfn = pci_dev->devfn
153 };
154
155 r = HYPERVISOR_physdev_op(PHYSDEVOP_manage_pci_remove,
156 &manage_pci);
157 }
Weidong Hane28c31a2010-10-27 17:55:04 +0100158
159 return r;
160}
161
162static int xen_pci_notifier(struct notifier_block *nb,
163 unsigned long action, void *data)
164{
165 struct device *dev = data;
166 int r = 0;
167
168 switch (action) {
169 case BUS_NOTIFY_ADD_DEVICE:
170 r = xen_add_device(dev);
171 break;
172 case BUS_NOTIFY_DEL_DEVICE:
173 r = xen_remove_device(dev);
174 break;
175 default:
Jan Beulich12e13ac2011-08-17 09:32:32 +0100176 return NOTIFY_DONE;
Weidong Hane28c31a2010-10-27 17:55:04 +0100177 }
Jan Beulich12e13ac2011-08-17 09:32:32 +0100178 if (r)
179 dev_err(dev, "Failed to %s - passthrough or MSI/MSI-X might fail!\n",
180 action == BUS_NOTIFY_ADD_DEVICE ? "add" :
181 (action == BUS_NOTIFY_DEL_DEVICE ? "delete" : "?"));
182 return NOTIFY_OK;
Weidong Hane28c31a2010-10-27 17:55:04 +0100183}
184
Jan Beulich12e13ac2011-08-17 09:32:32 +0100185static struct notifier_block device_nb = {
Weidong Hane28c31a2010-10-27 17:55:04 +0100186 .notifier_call = xen_pci_notifier,
187};
188
189static int __init register_xen_pci_notifier(void)
190{
191 if (!xen_initial_domain())
192 return 0;
193
194 return bus_register_notifier(&pci_bus_type, &device_nb);
195}
196
197arch_initcall(register_xen_pci_notifier);
Konrad Rzeszutek Wilk8deb3eb2013-10-25 16:26:02 -0400198
199#ifdef CONFIG_PCI_MMCONFIG
200static int __init xen_mcfg_late(void)
201{
202 struct pci_mmcfg_region *cfg;
203 int rc;
204
205 if (!xen_initial_domain())
206 return 0;
207
208 if ((pci_probe & PCI_PROBE_MMCONF) == 0)
209 return 0;
210
211 if (list_empty(&pci_mmcfg_list))
212 return 0;
213
214 /* Check whether they are in the right area. */
215 list_for_each_entry(cfg, &pci_mmcfg_list, list) {
216 struct physdev_pci_mmcfg_reserved r;
217
218 r.address = cfg->address;
219 r.segment = cfg->segment;
220 r.start_bus = cfg->start_bus;
221 r.end_bus = cfg->end_bus;
222 r.flags = XEN_PCI_MMCFG_RESERVED;
223
224 rc = HYPERVISOR_physdev_op(PHYSDEVOP_pci_mmcfg_reserved, &r);
225 switch (rc) {
226 case 0:
227 case -ENOSYS:
228 continue;
229
230 default:
231 pr_warn("Failed to report MMCONFIG reservation"
232 " state for %s to hypervisor"
233 " (%d)\n",
234 cfg->name, rc);
235 }
236 }
237 return 0;
238}
239/*
240 * Needs to be done after acpi_init which are subsys_initcall.
241 */
242subsys_initcall_sync(xen_mcfg_late);
243#endif