blob: 31f31d460fc9de789d28d72365122224fa3b2551 [file] [log] [blame]
Yu Zhaod1b054d2009-03-20 11:25:11 +08001/*
2 * drivers/pci/iov.c
3 *
4 * Copyright (C) 2009 Intel Corporation, Yu Zhao <yu.zhao@intel.com>
5 *
6 * PCI Express I/O Virtualization (IOV) support.
7 * Single Root IOV 1.0
Yu Zhao302b4212009-05-18 13:51:32 +08008 * Address Translation Service 1.0
Yu Zhaod1b054d2009-03-20 11:25:11 +08009 */
10
11#include <linux/pci.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090012#include <linux/slab.h>
Yu Zhaod1b054d2009-03-20 11:25:11 +080013#include <linux/mutex.h>
Paul Gortmaker363c75d2011-05-27 09:37:25 -040014#include <linux/export.h>
Yu Zhaod1b054d2009-03-20 11:25:11 +080015#include <linux/string.h>
16#include <linux/delay.h>
Joerg Roedel5cdede22011-04-04 15:55:18 +020017#include <linux/pci-ats.h>
Yu Zhaod1b054d2009-03-20 11:25:11 +080018#include "pci.h"
19
Yu Zhaodd7cc442009-03-20 11:25:15 +080020#define VIRTFN_ID_LEN 16
Yu Zhaod1b054d2009-03-20 11:25:11 +080021
Wei Yangb07579c2015-03-25 16:23:48 +080022int pci_iov_virtfn_bus(struct pci_dev *dev, int vf_id)
Yu Zhaoa28724b2009-03-20 11:25:13 +080023{
Wei Yangb07579c2015-03-25 16:23:48 +080024 if (!dev->is_physfn)
25 return -EINVAL;
Yu Zhaoa28724b2009-03-20 11:25:13 +080026 return dev->bus->number + ((dev->devfn + dev->sriov->offset +
Wei Yangb07579c2015-03-25 16:23:48 +080027 dev->sriov->stride * vf_id) >> 8);
Yu Zhaoa28724b2009-03-20 11:25:13 +080028}
29
Wei Yangb07579c2015-03-25 16:23:48 +080030int pci_iov_virtfn_devfn(struct pci_dev *dev, int vf_id)
Yu Zhaoa28724b2009-03-20 11:25:13 +080031{
Wei Yangb07579c2015-03-25 16:23:48 +080032 if (!dev->is_physfn)
33 return -EINVAL;
Yu Zhaoa28724b2009-03-20 11:25:13 +080034 return (dev->devfn + dev->sriov->offset +
Wei Yangb07579c2015-03-25 16:23:48 +080035 dev->sriov->stride * vf_id) & 0xff;
Yu Zhaoa28724b2009-03-20 11:25:13 +080036}
37
Wei Yangf59dca22015-03-25 16:23:46 +080038/*
39 * Per SR-IOV spec sec 3.3.10 and 3.3.11, First VF Offset and VF Stride may
40 * change when NumVFs changes.
41 *
42 * Update iov->offset and iov->stride when NumVFs is written.
43 */
44static inline void pci_iov_set_numvfs(struct pci_dev *dev, int nr_virtfn)
45{
46 struct pci_sriov *iov = dev->sriov;
47
48 pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, nr_virtfn);
49 pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_OFFSET, &iov->offset);
50 pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_STRIDE, &iov->stride);
51}
52
Wei Yang4449f072015-03-25 16:23:47 +080053/*
54 * The PF consumes one bus number. NumVFs, First VF Offset, and VF Stride
55 * determine how many additional bus numbers will be consumed by VFs.
56 *
Alexander Duyckea9a8852015-10-29 16:20:50 -050057 * Iterate over all valid NumVFs, validate offset and stride, and calculate
58 * the maximum number of bus numbers that could ever be required.
Wei Yang4449f072015-03-25 16:23:47 +080059 */
Alexander Duyckea9a8852015-10-29 16:20:50 -050060static int compute_max_vf_buses(struct pci_dev *dev)
Wei Yang4449f072015-03-25 16:23:47 +080061{
62 struct pci_sriov *iov = dev->sriov;
Alexander Duyckea9a8852015-10-29 16:20:50 -050063 int nr_virtfn, busnr, rc = 0;
Wei Yang4449f072015-03-25 16:23:47 +080064
Alexander Duyckea9a8852015-10-29 16:20:50 -050065 for (nr_virtfn = iov->total_VFs; nr_virtfn; nr_virtfn--) {
Wei Yang4449f072015-03-25 16:23:47 +080066 pci_iov_set_numvfs(dev, nr_virtfn);
Alexander Duyckea9a8852015-10-29 16:20:50 -050067 if (!iov->offset || (nr_virtfn > 1 && !iov->stride)) {
68 rc = -EIO;
69 goto out;
70 }
71
Wei Yangb07579c2015-03-25 16:23:48 +080072 busnr = pci_iov_virtfn_bus(dev, nr_virtfn - 1);
Alexander Duyckea9a8852015-10-29 16:20:50 -050073 if (busnr > iov->max_VF_buses)
74 iov->max_VF_buses = busnr;
Wei Yang4449f072015-03-25 16:23:47 +080075 }
76
Alexander Duyckea9a8852015-10-29 16:20:50 -050077out:
78 pci_iov_set_numvfs(dev, 0);
79 return rc;
Wei Yang4449f072015-03-25 16:23:47 +080080}
81
Yu Zhaodd7cc442009-03-20 11:25:15 +080082static struct pci_bus *virtfn_add_bus(struct pci_bus *bus, int busnr)
83{
Yu Zhaodd7cc442009-03-20 11:25:15 +080084 struct pci_bus *child;
85
86 if (bus->number == busnr)
87 return bus;
88
89 child = pci_find_bus(pci_domain_nr(bus), busnr);
90 if (child)
91 return child;
92
93 child = pci_add_new_bus(bus, NULL, busnr);
94 if (!child)
95 return NULL;
96
Yinghai Lub7eac052012-05-17 18:51:13 -070097 pci_bus_insert_busn_res(child, busnr, busnr);
Yu Zhaodd7cc442009-03-20 11:25:15 +080098
99 return child;
100}
101
Jiang Liudc087f22013-05-25 21:48:37 +0800102static void virtfn_remove_bus(struct pci_bus *physbus, struct pci_bus *virtbus)
Yu Zhaodd7cc442009-03-20 11:25:15 +0800103{
Jiang Liudc087f22013-05-25 21:48:37 +0800104 if (physbus != virtbus && list_empty(&virtbus->devices))
105 pci_remove_bus(virtbus);
Yu Zhaodd7cc442009-03-20 11:25:15 +0800106}
107
Wei Yang0e6c9122015-03-25 16:23:44 +0800108resource_size_t pci_iov_resource_size(struct pci_dev *dev, int resno)
109{
110 if (!dev->is_physfn)
111 return 0;
112
113 return dev->sriov->barsz[resno - PCI_IOV_RESOURCES];
114}
115
Yu Zhaodd7cc442009-03-20 11:25:15 +0800116static int virtfn_add(struct pci_dev *dev, int id, int reset)
117{
118 int i;
Jiang Liudc087f22013-05-25 21:48:37 +0800119 int rc = -ENOMEM;
Yu Zhaodd7cc442009-03-20 11:25:15 +0800120 u64 size;
121 char buf[VIRTFN_ID_LEN];
122 struct pci_dev *virtfn;
123 struct resource *res;
124 struct pci_sriov *iov = dev->sriov;
Gu Zheng8b1fce02013-05-25 21:48:31 +0800125 struct pci_bus *bus;
Yu Zhaodd7cc442009-03-20 11:25:15 +0800126
127 mutex_lock(&iov->dev->sriov->lock);
Wei Yangb07579c2015-03-25 16:23:48 +0800128 bus = virtfn_add_bus(dev->bus, pci_iov_virtfn_bus(dev, id));
Jiang Liudc087f22013-05-25 21:48:37 +0800129 if (!bus)
130 goto failed;
131
132 virtfn = pci_alloc_dev(bus);
133 if (!virtfn)
134 goto failed0;
135
Wei Yangb07579c2015-03-25 16:23:48 +0800136 virtfn->devfn = pci_iov_virtfn_devfn(dev, id);
Yu Zhaodd7cc442009-03-20 11:25:15 +0800137 virtfn->vendor = dev->vendor;
138 pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_DID, &virtfn->device);
139 pci_setup_device(virtfn);
140 virtfn->dev.parent = dev->dev.parent;
Xudong Haofbf33f52013-05-31 12:21:29 +0800141 virtfn->physfn = pci_dev_get(dev);
142 virtfn->is_virtfn = 1;
Alex Williamsonaa9319772014-01-09 08:36:08 -0700143 virtfn->multifunction = 0;
Yu Zhaodd7cc442009-03-20 11:25:15 +0800144
145 for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
Bjorn Helgaasc1fe1f92015-03-25 16:23:45 +0800146 res = &dev->resource[i + PCI_IOV_RESOURCES];
Yu Zhaodd7cc442009-03-20 11:25:15 +0800147 if (!res->parent)
148 continue;
149 virtfn->resource[i].name = pci_name(virtfn);
150 virtfn->resource[i].flags = res->flags;
Wei Yang0e6c9122015-03-25 16:23:44 +0800151 size = pci_iov_resource_size(dev, i + PCI_IOV_RESOURCES);
Yu Zhaodd7cc442009-03-20 11:25:15 +0800152 virtfn->resource[i].start = res->start + size * id;
153 virtfn->resource[i].end = virtfn->resource[i].start + size - 1;
154 rc = request_resource(res, &virtfn->resource[i]);
155 BUG_ON(rc);
156 }
157
158 if (reset)
Yu Zhao8c1c6992009-06-13 15:52:13 +0800159 __pci_reset_function(virtfn);
Yu Zhaodd7cc442009-03-20 11:25:15 +0800160
161 pci_device_add(virtfn, virtfn->bus);
162 mutex_unlock(&iov->dev->sriov->lock);
163
Yijing Wangc893d132014-05-30 11:01:03 +0800164 pci_bus_add_device(virtfn);
Yu Zhaodd7cc442009-03-20 11:25:15 +0800165 sprintf(buf, "virtfn%u", id);
166 rc = sysfs_create_link(&dev->dev.kobj, &virtfn->dev.kobj, buf);
167 if (rc)
168 goto failed1;
169 rc = sysfs_create_link(&virtfn->dev.kobj, &dev->dev.kobj, "physfn");
170 if (rc)
171 goto failed2;
172
173 kobject_uevent(&virtfn->dev.kobj, KOBJ_CHANGE);
174
175 return 0;
176
177failed2:
178 sysfs_remove_link(&dev->dev.kobj, buf);
179failed1:
180 pci_dev_put(dev);
181 mutex_lock(&iov->dev->sriov->lock);
Yinghai Lu210647a2012-02-25 13:54:20 -0800182 pci_stop_and_remove_bus_device(virtfn);
Jiang Liudc087f22013-05-25 21:48:37 +0800183failed0:
184 virtfn_remove_bus(dev->bus, bus);
185failed:
Yu Zhaodd7cc442009-03-20 11:25:15 +0800186 mutex_unlock(&iov->dev->sriov->lock);
187
188 return rc;
189}
190
191static void virtfn_remove(struct pci_dev *dev, int id, int reset)
192{
193 char buf[VIRTFN_ID_LEN];
Yu Zhaodd7cc442009-03-20 11:25:15 +0800194 struct pci_dev *virtfn;
195 struct pci_sriov *iov = dev->sriov;
196
Jiang Liudc087f22013-05-25 21:48:37 +0800197 virtfn = pci_get_domain_bus_and_slot(pci_domain_nr(dev->bus),
Wei Yangb07579c2015-03-25 16:23:48 +0800198 pci_iov_virtfn_bus(dev, id),
199 pci_iov_virtfn_devfn(dev, id));
Yu Zhaodd7cc442009-03-20 11:25:15 +0800200 if (!virtfn)
201 return;
202
Yu Zhaodd7cc442009-03-20 11:25:15 +0800203 if (reset) {
204 device_release_driver(&virtfn->dev);
Yu Zhao8c1c6992009-06-13 15:52:13 +0800205 __pci_reset_function(virtfn);
Yu Zhaodd7cc442009-03-20 11:25:15 +0800206 }
207
208 sprintf(buf, "virtfn%u", id);
209 sysfs_remove_link(&dev->dev.kobj, buf);
Yinghai Lu09cedbe2012-02-04 22:55:01 -0800210 /*
211 * pci_stop_dev() could have been called for this virtfn already,
212 * so the directory for the virtfn may have been removed before.
213 * Double check to avoid spurious sysfs warnings.
214 */
215 if (virtfn->dev.kobj.sd)
216 sysfs_remove_link(&virtfn->dev.kobj, "physfn");
Yu Zhaodd7cc442009-03-20 11:25:15 +0800217
218 mutex_lock(&iov->dev->sriov->lock);
Yinghai Lu210647a2012-02-25 13:54:20 -0800219 pci_stop_and_remove_bus_device(virtfn);
Jiang Liudc087f22013-05-25 21:48:37 +0800220 virtfn_remove_bus(dev->bus, virtfn->bus);
Yu Zhaodd7cc442009-03-20 11:25:15 +0800221 mutex_unlock(&iov->dev->sriov->lock);
222
Jiang Liudc087f22013-05-25 21:48:37 +0800223 /* balance pci_get_domain_bus_and_slot() */
224 pci_dev_put(virtfn);
Yu Zhaodd7cc442009-03-20 11:25:15 +0800225 pci_dev_put(dev);
226}
227
Wei Yang995df522015-03-25 16:23:49 +0800228int __weak pcibios_sriov_enable(struct pci_dev *pdev, u16 num_vfs)
229{
Alexander Duycka39e3fc2015-10-29 16:21:11 -0500230 return 0;
231}
232
233int __weak pcibios_sriov_disable(struct pci_dev *pdev)
234{
235 return 0;
Wei Yang995df522015-03-25 16:23:49 +0800236}
237
Yu Zhaodd7cc442009-03-20 11:25:15 +0800238static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
239{
240 int rc;
Alexander Duyck3443c382015-10-29 16:21:05 -0500241 int i;
Yu Zhaodd7cc442009-03-20 11:25:15 +0800242 int nres;
Alexander Duyckce288ec2015-10-29 16:20:57 -0500243 u16 initial;
Yu Zhaodd7cc442009-03-20 11:25:15 +0800244 struct resource *res;
245 struct pci_dev *pdev;
246 struct pci_sriov *iov = dev->sriov;
Ram Paibbef98a2011-11-06 10:33:10 +0800247 int bars = 0;
Wei Yangb07579c2015-03-25 16:23:48 +0800248 int bus;
Yu Zhaodd7cc442009-03-20 11:25:15 +0800249
250 if (!nr_virtfn)
251 return 0;
252
Bjorn Helgaas6b136722012-11-09 20:27:53 -0700253 if (iov->num_VFs)
Yu Zhaodd7cc442009-03-20 11:25:15 +0800254 return -EINVAL;
255
256 pci_read_config_word(dev, iov->pos + PCI_SRIOV_INITIAL_VF, &initial);
Bjorn Helgaas6b136722012-11-09 20:27:53 -0700257 if (initial > iov->total_VFs ||
258 (!(iov->cap & PCI_SRIOV_CAP_VFM) && (initial != iov->total_VFs)))
Yu Zhaodd7cc442009-03-20 11:25:15 +0800259 return -EIO;
260
Bjorn Helgaas6b136722012-11-09 20:27:53 -0700261 if (nr_virtfn < 0 || nr_virtfn > iov->total_VFs ||
Yu Zhaodd7cc442009-03-20 11:25:15 +0800262 (!(iov->cap & PCI_SRIOV_CAP_VFM) && (nr_virtfn > initial)))
263 return -EINVAL;
264
Yu Zhaodd7cc442009-03-20 11:25:15 +0800265 nres = 0;
266 for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
Ram Paibbef98a2011-11-06 10:33:10 +0800267 bars |= (1 << (i + PCI_IOV_RESOURCES));
Bjorn Helgaasc1fe1f92015-03-25 16:23:45 +0800268 res = &dev->resource[i + PCI_IOV_RESOURCES];
Yu Zhaodd7cc442009-03-20 11:25:15 +0800269 if (res->parent)
270 nres++;
271 }
272 if (nres != iov->nres) {
273 dev_err(&dev->dev, "not enough MMIO resources for SR-IOV\n");
274 return -ENOMEM;
275 }
276
Wei Yangb07579c2015-03-25 16:23:48 +0800277 bus = pci_iov_virtfn_bus(dev, nr_virtfn - 1);
Bjorn Helgaas68f8e9f2015-03-25 16:23:42 +0800278 if (bus > dev->bus->busn_res.end) {
279 dev_err(&dev->dev, "can't enable %d VFs (bus %02x out of range of %pR)\n",
280 nr_virtfn, bus, &dev->bus->busn_res);
Yu Zhaodd7cc442009-03-20 11:25:15 +0800281 return -ENOMEM;
282 }
283
Ram Paibbef98a2011-11-06 10:33:10 +0800284 if (pci_enable_resources(dev, bars)) {
285 dev_err(&dev->dev, "SR-IOV: IOV BARS not allocated\n");
286 return -ENOMEM;
287 }
288
Yu Zhaodd7cc442009-03-20 11:25:15 +0800289 if (iov->link != dev->devfn) {
290 pdev = pci_get_slot(dev->bus, iov->link);
291 if (!pdev)
292 return -ENODEV;
293
Jiang Liudc087f22013-05-25 21:48:37 +0800294 if (!pdev->is_physfn) {
295 pci_dev_put(pdev);
Stefan Assmann652d1102013-07-31 16:47:56 -0600296 return -ENOSYS;
Jiang Liudc087f22013-05-25 21:48:37 +0800297 }
Yu Zhaodd7cc442009-03-20 11:25:15 +0800298
299 rc = sysfs_create_link(&dev->dev.kobj,
300 &pdev->dev.kobj, "dep_link");
Jiang Liudc087f22013-05-25 21:48:37 +0800301 pci_dev_put(pdev);
Yu Zhaodd7cc442009-03-20 11:25:15 +0800302 if (rc)
303 return rc;
304 }
305
Wei Yangf59dca22015-03-25 16:23:46 +0800306 pci_iov_set_numvfs(dev, nr_virtfn);
Yu Zhaodd7cc442009-03-20 11:25:15 +0800307 iov->ctrl |= PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE;
Jan Kiszkafb51ccb2011-11-04 09:45:59 +0100308 pci_cfg_access_lock(dev);
Yu Zhaodd7cc442009-03-20 11:25:15 +0800309 pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
310 msleep(100);
Jan Kiszkafb51ccb2011-11-04 09:45:59 +0100311 pci_cfg_access_unlock(dev);
Yu Zhaodd7cc442009-03-20 11:25:15 +0800312
Bjorn Helgaas6b136722012-11-09 20:27:53 -0700313 iov->initial_VFs = initial;
Yu Zhaodd7cc442009-03-20 11:25:15 +0800314 if (nr_virtfn < initial)
315 initial = nr_virtfn;
316
Alexander Duyckc23b6132015-10-29 16:21:20 -0500317 rc = pcibios_sriov_enable(dev, initial);
318 if (rc) {
319 dev_err(&dev->dev, "failure %d from pcibios_sriov_enable()\n", rc);
320 goto err_pcibios;
Wei Yang995df522015-03-25 16:23:49 +0800321 }
322
Yu Zhaodd7cc442009-03-20 11:25:15 +0800323 for (i = 0; i < initial; i++) {
324 rc = virtfn_add(dev, i, 0);
325 if (rc)
326 goto failed;
327 }
328
329 kobject_uevent(&dev->dev.kobj, KOBJ_CHANGE);
Bjorn Helgaas6b136722012-11-09 20:27:53 -0700330 iov->num_VFs = nr_virtfn;
Yu Zhaodd7cc442009-03-20 11:25:15 +0800331
332 return 0;
333
334failed:
Alexander Duyck3443c382015-10-29 16:21:05 -0500335 while (i--)
336 virtfn_remove(dev, i, 0);
Yu Zhaodd7cc442009-03-20 11:25:15 +0800337
Alexander Duyckc23b6132015-10-29 16:21:20 -0500338 pcibios_sriov_disable(dev);
339err_pcibios:
Yu Zhaodd7cc442009-03-20 11:25:15 +0800340 iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE);
Jan Kiszkafb51ccb2011-11-04 09:45:59 +0100341 pci_cfg_access_lock(dev);
Yu Zhaodd7cc442009-03-20 11:25:15 +0800342 pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
343 ssleep(1);
Jan Kiszkafb51ccb2011-11-04 09:45:59 +0100344 pci_cfg_access_unlock(dev);
Yu Zhaodd7cc442009-03-20 11:25:15 +0800345
346 if (iov->link != dev->devfn)
347 sysfs_remove_link(&dev->dev.kobj, "dep_link");
348
Alexander Duyckb3908642015-10-29 16:21:16 -0500349 pci_iov_set_numvfs(dev, 0);
Yu Zhaodd7cc442009-03-20 11:25:15 +0800350 return rc;
351}
352
353static void sriov_disable(struct pci_dev *dev)
354{
355 int i;
356 struct pci_sriov *iov = dev->sriov;
357
Bjorn Helgaas6b136722012-11-09 20:27:53 -0700358 if (!iov->num_VFs)
Yu Zhaodd7cc442009-03-20 11:25:15 +0800359 return;
360
Bjorn Helgaas6b136722012-11-09 20:27:53 -0700361 for (i = 0; i < iov->num_VFs; i++)
Yu Zhaodd7cc442009-03-20 11:25:15 +0800362 virtfn_remove(dev, i, 0);
363
Wei Yang995df522015-03-25 16:23:49 +0800364 pcibios_sriov_disable(dev);
365
Yu Zhaodd7cc442009-03-20 11:25:15 +0800366 iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE);
Jan Kiszkafb51ccb2011-11-04 09:45:59 +0100367 pci_cfg_access_lock(dev);
Yu Zhaodd7cc442009-03-20 11:25:15 +0800368 pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
369 ssleep(1);
Jan Kiszkafb51ccb2011-11-04 09:45:59 +0100370 pci_cfg_access_unlock(dev);
Yu Zhaodd7cc442009-03-20 11:25:15 +0800371
372 if (iov->link != dev->devfn)
373 sysfs_remove_link(&dev->dev.kobj, "dep_link");
374
Bjorn Helgaas6b136722012-11-09 20:27:53 -0700375 iov->num_VFs = 0;
Wei Yangf59dca22015-03-25 16:23:46 +0800376 pci_iov_set_numvfs(dev, 0);
Yu Zhaodd7cc442009-03-20 11:25:15 +0800377}
378
Yu Zhaod1b054d2009-03-20 11:25:11 +0800379static int sriov_init(struct pci_dev *dev, int pos)
380{
Wei Yang0e6c9122015-03-25 16:23:44 +0800381 int i, bar64;
Yu Zhaod1b054d2009-03-20 11:25:11 +0800382 int rc;
383 int nres;
384 u32 pgsz;
Alexander Duyckea9a8852015-10-29 16:20:50 -0500385 u16 ctrl, total;
Yu Zhaod1b054d2009-03-20 11:25:11 +0800386 struct pci_sriov *iov;
387 struct resource *res;
388 struct pci_dev *pdev;
389
Yijing Wang62f87c02012-07-24 17:20:03 +0800390 if (pci_pcie_type(dev) != PCI_EXP_TYPE_RC_END &&
391 pci_pcie_type(dev) != PCI_EXP_TYPE_ENDPOINT)
Yu Zhaod1b054d2009-03-20 11:25:11 +0800392 return -ENODEV;
393
394 pci_read_config_word(dev, pos + PCI_SRIOV_CTRL, &ctrl);
395 if (ctrl & PCI_SRIOV_CTRL_VFE) {
396 pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, 0);
397 ssleep(1);
398 }
399
Yu Zhaod1b054d2009-03-20 11:25:11 +0800400 ctrl = 0;
401 list_for_each_entry(pdev, &dev->bus->devices, bus_list)
402 if (pdev->is_physfn)
403 goto found;
404
405 pdev = NULL;
406 if (pci_ari_enabled(dev->bus))
407 ctrl |= PCI_SRIOV_CTRL_ARI;
408
409found:
410 pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, ctrl);
Yu Zhaod1b054d2009-03-20 11:25:11 +0800411
Ben Sheltonff45f9d2015-10-29 16:20:31 -0500412 pci_read_config_word(dev, pos + PCI_SRIOV_TOTAL_VF, &total);
413 if (!total)
414 return 0;
Yu Zhaod1b054d2009-03-20 11:25:11 +0800415
416 pci_read_config_dword(dev, pos + PCI_SRIOV_SUP_PGSIZE, &pgsz);
417 i = PAGE_SHIFT > 12 ? PAGE_SHIFT - 12 : 0;
418 pgsz &= ~((1 << i) - 1);
419 if (!pgsz)
420 return -EIO;
421
422 pgsz &= ~(pgsz - 1);
Vaidyanathan Srinivasan8161fe92012-02-02 23:11:20 +0530423 pci_write_config_dword(dev, pos + PCI_SRIOV_SYS_PGSIZE, pgsz);
Yu Zhaod1b054d2009-03-20 11:25:11 +0800424
Wei Yang0e6c9122015-03-25 16:23:44 +0800425 iov = kzalloc(sizeof(*iov), GFP_KERNEL);
426 if (!iov)
427 return -ENOMEM;
428
Yu Zhaod1b054d2009-03-20 11:25:11 +0800429 nres = 0;
430 for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
Bjorn Helgaasc1fe1f92015-03-25 16:23:45 +0800431 res = &dev->resource[i + PCI_IOV_RESOURCES];
David Daney11183992015-10-29 17:35:40 -0500432 /*
433 * If it is already FIXED, don't change it, something
434 * (perhaps EA or header fixups) wants it this way.
435 */
436 if (res->flags & IORESOURCE_PCI_FIXED)
437 bar64 = (res->flags & IORESOURCE_MEM_64) ? 1 : 0;
438 else
439 bar64 = __pci_read_base(dev, pci_bar_unknown, res,
440 pos + PCI_SRIOV_BAR + i * 4);
Yu Zhaod1b054d2009-03-20 11:25:11 +0800441 if (!res->flags)
442 continue;
443 if (resource_size(res) & (PAGE_SIZE - 1)) {
444 rc = -EIO;
445 goto failed;
446 }
Wei Yang0e6c9122015-03-25 16:23:44 +0800447 iov->barsz[i] = resource_size(res);
Yu Zhaod1b054d2009-03-20 11:25:11 +0800448 res->end = res->start + resource_size(res) * total - 1;
Wei Yange88ae012015-03-25 16:23:43 +0800449 dev_info(&dev->dev, "VF(n) BAR%d space: %pR (contains BAR%d for %d VFs)\n",
450 i, res, i, total);
Wei Yang0e6c9122015-03-25 16:23:44 +0800451 i += bar64;
Yu Zhaod1b054d2009-03-20 11:25:11 +0800452 nres++;
453 }
454
Yu Zhaod1b054d2009-03-20 11:25:11 +0800455 iov->pos = pos;
456 iov->nres = nres;
457 iov->ctrl = ctrl;
Bjorn Helgaas6b136722012-11-09 20:27:53 -0700458 iov->total_VFs = total;
Yu Zhaod1b054d2009-03-20 11:25:11 +0800459 iov->pgsz = pgsz;
460 iov->self = dev;
461 pci_read_config_dword(dev, pos + PCI_SRIOV_CAP, &iov->cap);
462 pci_read_config_byte(dev, pos + PCI_SRIOV_FUNC_LINK, &iov->link);
Yijing Wang62f87c02012-07-24 17:20:03 +0800463 if (pci_pcie_type(dev) == PCI_EXP_TYPE_RC_END)
Yu Zhao4d135db2009-05-20 17:11:57 +0800464 iov->link = PCI_DEVFN(PCI_SLOT(dev->devfn), iov->link);
Yu Zhaod1b054d2009-03-20 11:25:11 +0800465
466 if (pdev)
467 iov->dev = pci_dev_get(pdev);
Yu Zhaoe277d2f2009-05-18 13:51:33 +0800468 else
Yu Zhaod1b054d2009-03-20 11:25:11 +0800469 iov->dev = dev;
Yu Zhaoe277d2f2009-05-18 13:51:33 +0800470
471 mutex_init(&iov->lock);
Yu Zhaod1b054d2009-03-20 11:25:11 +0800472
473 dev->sriov = iov;
474 dev->is_physfn = 1;
Alexander Duyckea9a8852015-10-29 16:20:50 -0500475 rc = compute_max_vf_buses(dev);
476 if (rc)
477 goto fail_max_buses;
Yu Zhaod1b054d2009-03-20 11:25:11 +0800478
479 return 0;
480
Alexander Duyckea9a8852015-10-29 16:20:50 -0500481fail_max_buses:
482 dev->sriov = NULL;
483 dev->is_physfn = 0;
Yu Zhaod1b054d2009-03-20 11:25:11 +0800484failed:
485 for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
Bjorn Helgaasc1fe1f92015-03-25 16:23:45 +0800486 res = &dev->resource[i + PCI_IOV_RESOURCES];
Yu Zhaod1b054d2009-03-20 11:25:11 +0800487 res->flags = 0;
488 }
489
Wei Yang0e6c9122015-03-25 16:23:44 +0800490 kfree(iov);
Yu Zhaod1b054d2009-03-20 11:25:11 +0800491 return rc;
492}
493
494static void sriov_release(struct pci_dev *dev)
495{
Bjorn Helgaas6b136722012-11-09 20:27:53 -0700496 BUG_ON(dev->sriov->num_VFs);
Yu Zhaodd7cc442009-03-20 11:25:15 +0800497
Yu Zhaoe277d2f2009-05-18 13:51:33 +0800498 if (dev != dev->sriov->dev)
Yu Zhaod1b054d2009-03-20 11:25:11 +0800499 pci_dev_put(dev->sriov->dev);
500
Yu Zhaoe277d2f2009-05-18 13:51:33 +0800501 mutex_destroy(&dev->sriov->lock);
502
Yu Zhaod1b054d2009-03-20 11:25:11 +0800503 kfree(dev->sriov);
504 dev->sriov = NULL;
505}
506
Yu Zhao8c5cdb62009-03-20 11:25:12 +0800507static void sriov_restore_state(struct pci_dev *dev)
508{
509 int i;
510 u16 ctrl;
511 struct pci_sriov *iov = dev->sriov;
512
513 pci_read_config_word(dev, iov->pos + PCI_SRIOV_CTRL, &ctrl);
514 if (ctrl & PCI_SRIOV_CTRL_VFE)
515 return;
516
517 for (i = PCI_IOV_RESOURCES; i <= PCI_IOV_RESOURCE_END; i++)
518 pci_update_resource(dev, i);
519
520 pci_write_config_dword(dev, iov->pos + PCI_SRIOV_SYS_PGSIZE, iov->pgsz);
Wei Yangf59dca22015-03-25 16:23:46 +0800521 pci_iov_set_numvfs(dev, iov->num_VFs);
Yu Zhao8c5cdb62009-03-20 11:25:12 +0800522 pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
523 if (iov->ctrl & PCI_SRIOV_CTRL_VFE)
524 msleep(100);
525}
526
Yu Zhaod1b054d2009-03-20 11:25:11 +0800527/**
528 * pci_iov_init - initialize the IOV capability
529 * @dev: the PCI device
530 *
531 * Returns 0 on success, or negative on failure.
532 */
533int pci_iov_init(struct pci_dev *dev)
534{
535 int pos;
536
Kenji Kaneshige5f4d91a2009-11-11 14:36:17 +0900537 if (!pci_is_pcie(dev))
Yu Zhaod1b054d2009-03-20 11:25:11 +0800538 return -ENODEV;
539
540 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_SRIOV);
541 if (pos)
542 return sriov_init(dev, pos);
543
544 return -ENODEV;
545}
546
547/**
548 * pci_iov_release - release resources used by the IOV capability
549 * @dev: the PCI device
550 */
551void pci_iov_release(struct pci_dev *dev)
552{
553 if (dev->is_physfn)
554 sriov_release(dev);
555}
556
557/**
558 * pci_iov_resource_bar - get position of the SR-IOV BAR
559 * @dev: the PCI device
560 * @resno: the resource number
Yu Zhaod1b054d2009-03-20 11:25:11 +0800561 *
562 * Returns position of the BAR encapsulated in the SR-IOV capability.
563 */
Myron Stowe26ff46c2014-11-11 08:04:50 -0700564int pci_iov_resource_bar(struct pci_dev *dev, int resno)
Yu Zhaod1b054d2009-03-20 11:25:11 +0800565{
566 if (resno < PCI_IOV_RESOURCES || resno > PCI_IOV_RESOURCE_END)
567 return 0;
568
569 BUG_ON(!dev->is_physfn);
570
Yu Zhaod1b054d2009-03-20 11:25:11 +0800571 return dev->sriov->pos + PCI_SRIOV_BAR +
572 4 * (resno - PCI_IOV_RESOURCES);
573}
Yu Zhao8c5cdb62009-03-20 11:25:12 +0800574
Wei Yang978d2d62015-03-25 16:23:50 +0800575resource_size_t __weak pcibios_iov_resource_alignment(struct pci_dev *dev,
576 int resno)
577{
578 return pci_iov_resource_size(dev, resno);
579}
580
Yu Zhao8c5cdb62009-03-20 11:25:12 +0800581/**
Chris Wright6faf17f2009-08-28 13:00:06 -0700582 * pci_sriov_resource_alignment - get resource alignment for VF BAR
583 * @dev: the PCI device
584 * @resno: the resource number
585 *
586 * Returns the alignment of the VF BAR found in the SR-IOV capability.
587 * This is not the same as the resource size which is defined as
588 * the VF BAR size multiplied by the number of VFs. The alignment
589 * is just the VF BAR size.
590 */
Cam Macdonell0e522472010-09-07 17:25:20 -0700591resource_size_t pci_sriov_resource_alignment(struct pci_dev *dev, int resno)
Chris Wright6faf17f2009-08-28 13:00:06 -0700592{
Wei Yang978d2d62015-03-25 16:23:50 +0800593 return pcibios_iov_resource_alignment(dev, resno);
Chris Wright6faf17f2009-08-28 13:00:06 -0700594}
595
596/**
Yu Zhao8c5cdb62009-03-20 11:25:12 +0800597 * pci_restore_iov_state - restore the state of the IOV capability
598 * @dev: the PCI device
599 */
600void pci_restore_iov_state(struct pci_dev *dev)
601{
602 if (dev->is_physfn)
603 sriov_restore_state(dev);
604}
Yu Zhaoa28724b2009-03-20 11:25:13 +0800605
606/**
607 * pci_iov_bus_range - find bus range used by Virtual Function
608 * @bus: the PCI bus
609 *
610 * Returns max number of buses (exclude current one) used by Virtual
611 * Functions.
612 */
613int pci_iov_bus_range(struct pci_bus *bus)
614{
615 int max = 0;
Yu Zhaoa28724b2009-03-20 11:25:13 +0800616 struct pci_dev *dev;
617
618 list_for_each_entry(dev, &bus->devices, bus_list) {
619 if (!dev->is_physfn)
620 continue;
Wei Yang4449f072015-03-25 16:23:47 +0800621 if (dev->sriov->max_VF_buses > max)
622 max = dev->sriov->max_VF_buses;
Yu Zhaoa28724b2009-03-20 11:25:13 +0800623 }
624
625 return max ? max - bus->number : 0;
626}
Yu Zhaodd7cc442009-03-20 11:25:15 +0800627
628/**
629 * pci_enable_sriov - enable the SR-IOV capability
630 * @dev: the PCI device
Randy Dunlap52a88732009-04-01 17:45:30 -0700631 * @nr_virtfn: number of virtual functions to enable
Yu Zhaodd7cc442009-03-20 11:25:15 +0800632 *
633 * Returns 0 on success, or negative on failure.
634 */
635int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn)
636{
637 might_sleep();
638
639 if (!dev->is_physfn)
Stefan Assmann652d1102013-07-31 16:47:56 -0600640 return -ENOSYS;
Yu Zhaodd7cc442009-03-20 11:25:15 +0800641
642 return sriov_enable(dev, nr_virtfn);
643}
644EXPORT_SYMBOL_GPL(pci_enable_sriov);
645
646/**
647 * pci_disable_sriov - disable the SR-IOV capability
648 * @dev: the PCI device
649 */
650void pci_disable_sriov(struct pci_dev *dev)
651{
652 might_sleep();
653
654 if (!dev->is_physfn)
655 return;
656
657 sriov_disable(dev);
658}
659EXPORT_SYMBOL_GPL(pci_disable_sriov);
Yu Zhao74bb1bc2009-03-20 11:25:16 +0800660
661/**
Williams, Mitch Afb8a0d92010-02-10 01:43:04 +0000662 * pci_num_vf - return number of VFs associated with a PF device_release_driver
663 * @dev: the PCI device
664 *
665 * Returns number of VFs, or 0 if SR-IOV is not enabled.
666 */
667int pci_num_vf(struct pci_dev *dev)
668{
Bjorn Helgaas1452cd72012-11-09 20:35:01 -0700669 if (!dev->is_physfn)
Williams, Mitch Afb8a0d92010-02-10 01:43:04 +0000670 return 0;
Bjorn Helgaas1452cd72012-11-09 20:35:01 -0700671
672 return dev->sriov->num_VFs;
Williams, Mitch Afb8a0d92010-02-10 01:43:04 +0000673}
674EXPORT_SYMBOL_GPL(pci_num_vf);
Donald Dutilebff73152012-11-05 15:20:37 -0500675
676/**
Alexander Duyck5a8eb242013-04-25 04:42:29 +0000677 * pci_vfs_assigned - returns number of VFs are assigned to a guest
678 * @dev: the PCI device
679 *
680 * Returns number of VFs belonging to this device that are assigned to a guest.
Stefan Assmann652d1102013-07-31 16:47:56 -0600681 * If device is not a physical function returns 0.
Alexander Duyck5a8eb242013-04-25 04:42:29 +0000682 */
683int pci_vfs_assigned(struct pci_dev *dev)
684{
685 struct pci_dev *vfdev;
686 unsigned int vfs_assigned = 0;
687 unsigned short dev_id;
688
689 /* only search if we are a PF */
690 if (!dev->is_physfn)
691 return 0;
692
693 /*
694 * determine the device ID for the VFs, the vendor ID will be the
695 * same as the PF so there is no need to check for that one
696 */
697 pci_read_config_word(dev, dev->sriov->pos + PCI_SRIOV_VF_DID, &dev_id);
698
699 /* loop through all the VFs to see if we own any that are assigned */
700 vfdev = pci_get_device(dev->vendor, dev_id, NULL);
701 while (vfdev) {
702 /*
703 * It is considered assigned if it is a virtual function with
704 * our dev as the physical function and the assigned bit is set
705 */
706 if (vfdev->is_virtfn && (vfdev->physfn == dev) &&
Ethan Zhaobe634972014-09-09 10:21:28 +0800707 pci_is_dev_assigned(vfdev))
Alexander Duyck5a8eb242013-04-25 04:42:29 +0000708 vfs_assigned++;
709
710 vfdev = pci_get_device(dev->vendor, dev_id, vfdev);
711 }
712
713 return vfs_assigned;
714}
715EXPORT_SYMBOL_GPL(pci_vfs_assigned);
716
717/**
Donald Dutilebff73152012-11-05 15:20:37 -0500718 * pci_sriov_set_totalvfs -- reduce the TotalVFs available
719 * @dev: the PCI PF device
Randy Dunlap2094f162013-01-09 17:12:52 -0800720 * @numvfs: number that should be used for TotalVFs supported
Donald Dutilebff73152012-11-05 15:20:37 -0500721 *
722 * Should be called from PF driver's probe routine with
723 * device's mutex held.
724 *
725 * Returns 0 if PF is an SRIOV-capable device and
Stefan Assmann652d1102013-07-31 16:47:56 -0600726 * value of numvfs valid. If not a PF return -ENOSYS;
727 * if numvfs is invalid return -EINVAL;
Donald Dutilebff73152012-11-05 15:20:37 -0500728 * if VFs already enabled, return -EBUSY.
729 */
730int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 numvfs)
731{
Stefan Assmann652d1102013-07-31 16:47:56 -0600732 if (!dev->is_physfn)
733 return -ENOSYS;
734 if (numvfs > dev->sriov->total_VFs)
Donald Dutilebff73152012-11-05 15:20:37 -0500735 return -EINVAL;
736
737 /* Shouldn't change if VFs already enabled */
738 if (dev->sriov->ctrl & PCI_SRIOV_CTRL_VFE)
739 return -EBUSY;
740 else
Bjorn Helgaas6b136722012-11-09 20:27:53 -0700741 dev->sriov->driver_max_VFs = numvfs;
Donald Dutilebff73152012-11-05 15:20:37 -0500742
743 return 0;
744}
745EXPORT_SYMBOL_GPL(pci_sriov_set_totalvfs);
746
747/**
Jonghwan Choiddc191f2013-07-08 14:02:43 -0600748 * pci_sriov_get_totalvfs -- get total VFs supported on this device
Donald Dutilebff73152012-11-05 15:20:37 -0500749 * @dev: the PCI PF device
750 *
751 * For a PCIe device with SRIOV support, return the PCIe
Bjorn Helgaas6b136722012-11-09 20:27:53 -0700752 * SRIOV capability value of TotalVFs or the value of driver_max_VFs
Stefan Assmann652d1102013-07-31 16:47:56 -0600753 * if the driver reduced it. Otherwise 0.
Donald Dutilebff73152012-11-05 15:20:37 -0500754 */
755int pci_sriov_get_totalvfs(struct pci_dev *dev)
756{
Bjorn Helgaas1452cd72012-11-09 20:35:01 -0700757 if (!dev->is_physfn)
Stefan Assmann652d1102013-07-31 16:47:56 -0600758 return 0;
Donald Dutilebff73152012-11-05 15:20:37 -0500759
Bjorn Helgaas6b136722012-11-09 20:27:53 -0700760 if (dev->sriov->driver_max_VFs)
761 return dev->sriov->driver_max_VFs;
Bjorn Helgaas1452cd72012-11-09 20:35:01 -0700762
763 return dev->sriov->total_VFs;
Donald Dutilebff73152012-11-05 15:20:37 -0500764}
765EXPORT_SYMBOL_GPL(pci_sriov_get_totalvfs);