blob: b0fe7712b4d4bc153aa23964260562c470dda39a [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
Yu Zhaoa28724b2009-03-20 11:25:13 +080022static inline u8 virtfn_bus(struct pci_dev *dev, int id)
23{
24 return dev->bus->number + ((dev->devfn + dev->sriov->offset +
25 dev->sriov->stride * id) >> 8);
26}
27
28static inline u8 virtfn_devfn(struct pci_dev *dev, int id)
29{
30 return (dev->devfn + dev->sriov->offset +
31 dev->sriov->stride * id) & 0xff;
32}
33
Yu Zhaodd7cc442009-03-20 11:25:15 +080034static struct pci_bus *virtfn_add_bus(struct pci_bus *bus, int busnr)
35{
36 int rc;
37 struct pci_bus *child;
38
39 if (bus->number == busnr)
40 return bus;
41
42 child = pci_find_bus(pci_domain_nr(bus), busnr);
43 if (child)
44 return child;
45
46 child = pci_add_new_bus(bus, NULL, busnr);
47 if (!child)
48 return NULL;
49
Yinghai Lub7eac052012-05-17 18:51:13 -070050 pci_bus_insert_busn_res(child, busnr, busnr);
Yu Zhaodd7cc442009-03-20 11:25:15 +080051 child->dev.parent = bus->bridge;
52 rc = pci_bus_add_child(child);
53 if (rc) {
54 pci_remove_bus(child);
55 return NULL;
56 }
57
58 return child;
59}
60
61static void virtfn_remove_bus(struct pci_bus *bus, int busnr)
62{
63 struct pci_bus *child;
64
65 if (bus->number == busnr)
66 return;
67
68 child = pci_find_bus(pci_domain_nr(bus), busnr);
69 BUG_ON(!child);
70
71 if (list_empty(&child->devices))
72 pci_remove_bus(child);
73}
74
75static int virtfn_add(struct pci_dev *dev, int id, int reset)
76{
77 int i;
78 int rc;
79 u64 size;
80 char buf[VIRTFN_ID_LEN];
81 struct pci_dev *virtfn;
82 struct resource *res;
83 struct pci_sriov *iov = dev->sriov;
84
85 virtfn = alloc_pci_dev();
86 if (!virtfn)
87 return -ENOMEM;
88
89 mutex_lock(&iov->dev->sriov->lock);
90 virtfn->bus = virtfn_add_bus(dev->bus, virtfn_bus(dev, id));
91 if (!virtfn->bus) {
92 kfree(virtfn);
93 mutex_unlock(&iov->dev->sriov->lock);
94 return -ENOMEM;
95 }
96 virtfn->devfn = virtfn_devfn(dev, id);
97 virtfn->vendor = dev->vendor;
98 pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_DID, &virtfn->device);
99 pci_setup_device(virtfn);
100 virtfn->dev.parent = dev->dev.parent;
101
102 for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
103 res = dev->resource + PCI_IOV_RESOURCES + i;
104 if (!res->parent)
105 continue;
106 virtfn->resource[i].name = pci_name(virtfn);
107 virtfn->resource[i].flags = res->flags;
108 size = resource_size(res);
109 do_div(size, iov->total);
110 virtfn->resource[i].start = res->start + size * id;
111 virtfn->resource[i].end = virtfn->resource[i].start + size - 1;
112 rc = request_resource(res, &virtfn->resource[i]);
113 BUG_ON(rc);
114 }
115
116 if (reset)
Yu Zhao8c1c6992009-06-13 15:52:13 +0800117 __pci_reset_function(virtfn);
Yu Zhaodd7cc442009-03-20 11:25:15 +0800118
119 pci_device_add(virtfn, virtfn->bus);
120 mutex_unlock(&iov->dev->sriov->lock);
121
122 virtfn->physfn = pci_dev_get(dev);
123 virtfn->is_virtfn = 1;
124
125 rc = pci_bus_add_device(virtfn);
126 if (rc)
127 goto failed1;
128 sprintf(buf, "virtfn%u", id);
129 rc = sysfs_create_link(&dev->dev.kobj, &virtfn->dev.kobj, buf);
130 if (rc)
131 goto failed1;
132 rc = sysfs_create_link(&virtfn->dev.kobj, &dev->dev.kobj, "physfn");
133 if (rc)
134 goto failed2;
135
136 kobject_uevent(&virtfn->dev.kobj, KOBJ_CHANGE);
137
138 return 0;
139
140failed2:
141 sysfs_remove_link(&dev->dev.kobj, buf);
142failed1:
143 pci_dev_put(dev);
144 mutex_lock(&iov->dev->sriov->lock);
Yinghai Lu210647a2012-02-25 13:54:20 -0800145 pci_stop_and_remove_bus_device(virtfn);
Yu Zhaodd7cc442009-03-20 11:25:15 +0800146 virtfn_remove_bus(dev->bus, virtfn_bus(dev, id));
147 mutex_unlock(&iov->dev->sriov->lock);
148
149 return rc;
150}
151
152static void virtfn_remove(struct pci_dev *dev, int id, int reset)
153{
154 char buf[VIRTFN_ID_LEN];
Yu Zhaodd7cc442009-03-20 11:25:15 +0800155 struct pci_dev *virtfn;
156 struct pci_sriov *iov = dev->sriov;
157
Jiang Liu433efd22012-08-28 23:43:57 +0800158 virtfn = pci_get_domain_bus_and_slot(pci_domain_nr(dev->bus),
159 virtfn_bus(dev, id), virtfn_devfn(dev, id));
Yu Zhaodd7cc442009-03-20 11:25:15 +0800160 if (!virtfn)
161 return;
162
163 pci_dev_put(virtfn);
164
165 if (reset) {
166 device_release_driver(&virtfn->dev);
Yu Zhao8c1c6992009-06-13 15:52:13 +0800167 __pci_reset_function(virtfn);
Yu Zhaodd7cc442009-03-20 11:25:15 +0800168 }
169
170 sprintf(buf, "virtfn%u", id);
171 sysfs_remove_link(&dev->dev.kobj, buf);
Yinghai Lu09cedbe2012-02-04 22:55:01 -0800172 /*
173 * pci_stop_dev() could have been called for this virtfn already,
174 * so the directory for the virtfn may have been removed before.
175 * Double check to avoid spurious sysfs warnings.
176 */
177 if (virtfn->dev.kobj.sd)
178 sysfs_remove_link(&virtfn->dev.kobj, "physfn");
Yu Zhaodd7cc442009-03-20 11:25:15 +0800179
180 mutex_lock(&iov->dev->sriov->lock);
Yinghai Lu210647a2012-02-25 13:54:20 -0800181 pci_stop_and_remove_bus_device(virtfn);
Yu Zhaodd7cc442009-03-20 11:25:15 +0800182 virtfn_remove_bus(dev->bus, virtfn_bus(dev, id));
183 mutex_unlock(&iov->dev->sriov->lock);
184
185 pci_dev_put(dev);
186}
187
Yu Zhao74bb1bc2009-03-20 11:25:16 +0800188static int sriov_migration(struct pci_dev *dev)
189{
190 u16 status;
191 struct pci_sriov *iov = dev->sriov;
192
193 if (!iov->nr_virtfn)
194 return 0;
195
196 if (!(iov->cap & PCI_SRIOV_CAP_VFM))
197 return 0;
198
199 pci_read_config_word(dev, iov->pos + PCI_SRIOV_STATUS, &status);
200 if (!(status & PCI_SRIOV_STATUS_VFM))
201 return 0;
202
203 schedule_work(&iov->mtask);
204
205 return 1;
206}
207
208static void sriov_migration_task(struct work_struct *work)
209{
210 int i;
211 u8 state;
212 u16 status;
213 struct pci_sriov *iov = container_of(work, struct pci_sriov, mtask);
214
215 for (i = iov->initial; i < iov->nr_virtfn; i++) {
216 state = readb(iov->mstate + i);
217 if (state == PCI_SRIOV_VFM_MI) {
218 writeb(PCI_SRIOV_VFM_AV, iov->mstate + i);
219 state = readb(iov->mstate + i);
220 if (state == PCI_SRIOV_VFM_AV)
221 virtfn_add(iov->self, i, 1);
222 } else if (state == PCI_SRIOV_VFM_MO) {
223 virtfn_remove(iov->self, i, 1);
224 writeb(PCI_SRIOV_VFM_UA, iov->mstate + i);
225 state = readb(iov->mstate + i);
226 if (state == PCI_SRIOV_VFM_AV)
227 virtfn_add(iov->self, i, 0);
228 }
229 }
230
231 pci_read_config_word(iov->self, iov->pos + PCI_SRIOV_STATUS, &status);
232 status &= ~PCI_SRIOV_STATUS_VFM;
233 pci_write_config_word(iov->self, iov->pos + PCI_SRIOV_STATUS, status);
234}
235
236static int sriov_enable_migration(struct pci_dev *dev, int nr_virtfn)
237{
238 int bir;
239 u32 table;
240 resource_size_t pa;
241 struct pci_sriov *iov = dev->sriov;
242
243 if (nr_virtfn <= iov->initial)
244 return 0;
245
246 pci_read_config_dword(dev, iov->pos + PCI_SRIOV_VFM, &table);
247 bir = PCI_SRIOV_VFM_BIR(table);
248 if (bir > PCI_STD_RESOURCE_END)
249 return -EIO;
250
251 table = PCI_SRIOV_VFM_OFFSET(table);
252 if (table + nr_virtfn > pci_resource_len(dev, bir))
253 return -EIO;
254
255 pa = pci_resource_start(dev, bir) + table;
256 iov->mstate = ioremap(pa, nr_virtfn);
257 if (!iov->mstate)
258 return -ENOMEM;
259
260 INIT_WORK(&iov->mtask, sriov_migration_task);
261
262 iov->ctrl |= PCI_SRIOV_CTRL_VFM | PCI_SRIOV_CTRL_INTR;
263 pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
264
265 return 0;
266}
267
268static void sriov_disable_migration(struct pci_dev *dev)
269{
270 struct pci_sriov *iov = dev->sriov;
271
272 iov->ctrl &= ~(PCI_SRIOV_CTRL_VFM | PCI_SRIOV_CTRL_INTR);
273 pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
274
275 cancel_work_sync(&iov->mtask);
276 iounmap(iov->mstate);
277}
278
Yu Zhaodd7cc442009-03-20 11:25:15 +0800279static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
280{
281 int rc;
282 int i, j;
283 int nres;
284 u16 offset, stride, initial;
285 struct resource *res;
286 struct pci_dev *pdev;
287 struct pci_sriov *iov = dev->sriov;
Ram Paibbef98a2011-11-06 10:33:10 +0800288 int bars = 0;
Yu Zhaodd7cc442009-03-20 11:25:15 +0800289
290 if (!nr_virtfn)
291 return 0;
292
293 if (iov->nr_virtfn)
294 return -EINVAL;
295
296 pci_read_config_word(dev, iov->pos + PCI_SRIOV_INITIAL_VF, &initial);
297 if (initial > iov->total ||
298 (!(iov->cap & PCI_SRIOV_CAP_VFM) && (initial != iov->total)))
299 return -EIO;
300
301 if (nr_virtfn < 0 || nr_virtfn > iov->total ||
302 (!(iov->cap & PCI_SRIOV_CAP_VFM) && (nr_virtfn > initial)))
303 return -EINVAL;
304
305 pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, nr_virtfn);
306 pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_OFFSET, &offset);
307 pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_STRIDE, &stride);
308 if (!offset || (nr_virtfn > 1 && !stride))
309 return -EIO;
310
311 nres = 0;
312 for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
Ram Paibbef98a2011-11-06 10:33:10 +0800313 bars |= (1 << (i + PCI_IOV_RESOURCES));
Yu Zhaodd7cc442009-03-20 11:25:15 +0800314 res = dev->resource + PCI_IOV_RESOURCES + i;
315 if (res->parent)
316 nres++;
317 }
318 if (nres != iov->nres) {
319 dev_err(&dev->dev, "not enough MMIO resources for SR-IOV\n");
320 return -ENOMEM;
321 }
322
323 iov->offset = offset;
324 iov->stride = stride;
325
Yinghai Lub918c622012-05-17 18:51:11 -0700326 if (virtfn_bus(dev, nr_virtfn - 1) > dev->bus->busn_res.end) {
Yu Zhaodd7cc442009-03-20 11:25:15 +0800327 dev_err(&dev->dev, "SR-IOV: bus number out of range\n");
328 return -ENOMEM;
329 }
330
Ram Paibbef98a2011-11-06 10:33:10 +0800331 if (pci_enable_resources(dev, bars)) {
332 dev_err(&dev->dev, "SR-IOV: IOV BARS not allocated\n");
333 return -ENOMEM;
334 }
335
Yu Zhaodd7cc442009-03-20 11:25:15 +0800336 if (iov->link != dev->devfn) {
337 pdev = pci_get_slot(dev->bus, iov->link);
338 if (!pdev)
339 return -ENODEV;
340
341 pci_dev_put(pdev);
342
343 if (!pdev->is_physfn)
344 return -ENODEV;
345
346 rc = sysfs_create_link(&dev->dev.kobj,
347 &pdev->dev.kobj, "dep_link");
348 if (rc)
349 return rc;
350 }
351
352 iov->ctrl |= PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE;
Jan Kiszkafb51ccb2011-11-04 09:45:59 +0100353 pci_cfg_access_lock(dev);
Yu Zhaodd7cc442009-03-20 11:25:15 +0800354 pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
355 msleep(100);
Jan Kiszkafb51ccb2011-11-04 09:45:59 +0100356 pci_cfg_access_unlock(dev);
Yu Zhaodd7cc442009-03-20 11:25:15 +0800357
358 iov->initial = initial;
359 if (nr_virtfn < initial)
360 initial = nr_virtfn;
361
362 for (i = 0; i < initial; i++) {
363 rc = virtfn_add(dev, i, 0);
364 if (rc)
365 goto failed;
366 }
367
Yu Zhao74bb1bc2009-03-20 11:25:16 +0800368 if (iov->cap & PCI_SRIOV_CAP_VFM) {
369 rc = sriov_enable_migration(dev, nr_virtfn);
370 if (rc)
371 goto failed;
372 }
373
Yu Zhaodd7cc442009-03-20 11:25:15 +0800374 kobject_uevent(&dev->dev.kobj, KOBJ_CHANGE);
375 iov->nr_virtfn = nr_virtfn;
376
377 return 0;
378
379failed:
380 for (j = 0; j < i; j++)
381 virtfn_remove(dev, j, 0);
382
383 iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE);
Jan Kiszkafb51ccb2011-11-04 09:45:59 +0100384 pci_cfg_access_lock(dev);
Yu Zhaodd7cc442009-03-20 11:25:15 +0800385 pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
386 ssleep(1);
Jan Kiszkafb51ccb2011-11-04 09:45:59 +0100387 pci_cfg_access_unlock(dev);
Yu Zhaodd7cc442009-03-20 11:25:15 +0800388
389 if (iov->link != dev->devfn)
390 sysfs_remove_link(&dev->dev.kobj, "dep_link");
391
392 return rc;
393}
394
395static void sriov_disable(struct pci_dev *dev)
396{
397 int i;
398 struct pci_sriov *iov = dev->sriov;
399
400 if (!iov->nr_virtfn)
401 return;
402
Yu Zhao74bb1bc2009-03-20 11:25:16 +0800403 if (iov->cap & PCI_SRIOV_CAP_VFM)
404 sriov_disable_migration(dev);
405
Yu Zhaodd7cc442009-03-20 11:25:15 +0800406 for (i = 0; i < iov->nr_virtfn; i++)
407 virtfn_remove(dev, i, 0);
408
409 iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE);
Jan Kiszkafb51ccb2011-11-04 09:45:59 +0100410 pci_cfg_access_lock(dev);
Yu Zhaodd7cc442009-03-20 11:25:15 +0800411 pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
412 ssleep(1);
Jan Kiszkafb51ccb2011-11-04 09:45:59 +0100413 pci_cfg_access_unlock(dev);
Yu Zhaodd7cc442009-03-20 11:25:15 +0800414
415 if (iov->link != dev->devfn)
416 sysfs_remove_link(&dev->dev.kobj, "dep_link");
417
418 iov->nr_virtfn = 0;
419}
420
Yu Zhaod1b054d2009-03-20 11:25:11 +0800421static int sriov_init(struct pci_dev *dev, int pos)
422{
423 int i;
424 int rc;
425 int nres;
426 u32 pgsz;
427 u16 ctrl, total, offset, stride;
428 struct pci_sriov *iov;
429 struct resource *res;
430 struct pci_dev *pdev;
431
Yijing Wang62f87c02012-07-24 17:20:03 +0800432 if (pci_pcie_type(dev) != PCI_EXP_TYPE_RC_END &&
433 pci_pcie_type(dev) != PCI_EXP_TYPE_ENDPOINT)
Yu Zhaod1b054d2009-03-20 11:25:11 +0800434 return -ENODEV;
435
436 pci_read_config_word(dev, pos + PCI_SRIOV_CTRL, &ctrl);
437 if (ctrl & PCI_SRIOV_CTRL_VFE) {
438 pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, 0);
439 ssleep(1);
440 }
441
442 pci_read_config_word(dev, pos + PCI_SRIOV_TOTAL_VF, &total);
443 if (!total)
444 return 0;
445
446 ctrl = 0;
447 list_for_each_entry(pdev, &dev->bus->devices, bus_list)
448 if (pdev->is_physfn)
449 goto found;
450
451 pdev = NULL;
452 if (pci_ari_enabled(dev->bus))
453 ctrl |= PCI_SRIOV_CTRL_ARI;
454
455found:
456 pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, ctrl);
Yu Zhaod1b054d2009-03-20 11:25:11 +0800457 pci_read_config_word(dev, pos + PCI_SRIOV_VF_OFFSET, &offset);
458 pci_read_config_word(dev, pos + PCI_SRIOV_VF_STRIDE, &stride);
459 if (!offset || (total > 1 && !stride))
460 return -EIO;
461
462 pci_read_config_dword(dev, pos + PCI_SRIOV_SUP_PGSIZE, &pgsz);
463 i = PAGE_SHIFT > 12 ? PAGE_SHIFT - 12 : 0;
464 pgsz &= ~((1 << i) - 1);
465 if (!pgsz)
466 return -EIO;
467
468 pgsz &= ~(pgsz - 1);
Vaidyanathan Srinivasan8161fe92012-02-02 23:11:20 +0530469 pci_write_config_dword(dev, pos + PCI_SRIOV_SYS_PGSIZE, pgsz);
Yu Zhaod1b054d2009-03-20 11:25:11 +0800470
471 nres = 0;
472 for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
473 res = dev->resource + PCI_IOV_RESOURCES + i;
474 i += __pci_read_base(dev, pci_bar_unknown, res,
475 pos + PCI_SRIOV_BAR + i * 4);
476 if (!res->flags)
477 continue;
478 if (resource_size(res) & (PAGE_SIZE - 1)) {
479 rc = -EIO;
480 goto failed;
481 }
482 res->end = res->start + resource_size(res) * total - 1;
483 nres++;
484 }
485
486 iov = kzalloc(sizeof(*iov), GFP_KERNEL);
487 if (!iov) {
488 rc = -ENOMEM;
489 goto failed;
490 }
491
492 iov->pos = pos;
493 iov->nres = nres;
494 iov->ctrl = ctrl;
495 iov->total = total;
496 iov->offset = offset;
497 iov->stride = stride;
498 iov->pgsz = pgsz;
499 iov->self = dev;
500 pci_read_config_dword(dev, pos + PCI_SRIOV_CAP, &iov->cap);
501 pci_read_config_byte(dev, pos + PCI_SRIOV_FUNC_LINK, &iov->link);
Yijing Wang62f87c02012-07-24 17:20:03 +0800502 if (pci_pcie_type(dev) == PCI_EXP_TYPE_RC_END)
Yu Zhao4d135db2009-05-20 17:11:57 +0800503 iov->link = PCI_DEVFN(PCI_SLOT(dev->devfn), iov->link);
Yu Zhaod1b054d2009-03-20 11:25:11 +0800504
505 if (pdev)
506 iov->dev = pci_dev_get(pdev);
Yu Zhaoe277d2f2009-05-18 13:51:33 +0800507 else
Yu Zhaod1b054d2009-03-20 11:25:11 +0800508 iov->dev = dev;
Yu Zhaoe277d2f2009-05-18 13:51:33 +0800509
510 mutex_init(&iov->lock);
Yu Zhaod1b054d2009-03-20 11:25:11 +0800511
512 dev->sriov = iov;
513 dev->is_physfn = 1;
514
515 return 0;
516
517failed:
518 for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
519 res = dev->resource + PCI_IOV_RESOURCES + i;
520 res->flags = 0;
521 }
522
523 return rc;
524}
525
526static void sriov_release(struct pci_dev *dev)
527{
Yu Zhaodd7cc442009-03-20 11:25:15 +0800528 BUG_ON(dev->sriov->nr_virtfn);
529
Yu Zhaoe277d2f2009-05-18 13:51:33 +0800530 if (dev != dev->sriov->dev)
Yu Zhaod1b054d2009-03-20 11:25:11 +0800531 pci_dev_put(dev->sriov->dev);
532
Yu Zhaoe277d2f2009-05-18 13:51:33 +0800533 mutex_destroy(&dev->sriov->lock);
534
Yu Zhaod1b054d2009-03-20 11:25:11 +0800535 kfree(dev->sriov);
536 dev->sriov = NULL;
537}
538
Yu Zhao8c5cdb62009-03-20 11:25:12 +0800539static void sriov_restore_state(struct pci_dev *dev)
540{
541 int i;
542 u16 ctrl;
543 struct pci_sriov *iov = dev->sriov;
544
545 pci_read_config_word(dev, iov->pos + PCI_SRIOV_CTRL, &ctrl);
546 if (ctrl & PCI_SRIOV_CTRL_VFE)
547 return;
548
549 for (i = PCI_IOV_RESOURCES; i <= PCI_IOV_RESOURCE_END; i++)
550 pci_update_resource(dev, i);
551
552 pci_write_config_dword(dev, iov->pos + PCI_SRIOV_SYS_PGSIZE, iov->pgsz);
Yu Zhaodd7cc442009-03-20 11:25:15 +0800553 pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, iov->nr_virtfn);
Yu Zhao8c5cdb62009-03-20 11:25:12 +0800554 pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
555 if (iov->ctrl & PCI_SRIOV_CTRL_VFE)
556 msleep(100);
557}
558
Yu Zhaod1b054d2009-03-20 11:25:11 +0800559/**
560 * pci_iov_init - initialize the IOV capability
561 * @dev: the PCI device
562 *
563 * Returns 0 on success, or negative on failure.
564 */
565int pci_iov_init(struct pci_dev *dev)
566{
567 int pos;
568
Kenji Kaneshige5f4d91a2009-11-11 14:36:17 +0900569 if (!pci_is_pcie(dev))
Yu Zhaod1b054d2009-03-20 11:25:11 +0800570 return -ENODEV;
571
572 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_SRIOV);
573 if (pos)
574 return sriov_init(dev, pos);
575
576 return -ENODEV;
577}
578
579/**
580 * pci_iov_release - release resources used by the IOV capability
581 * @dev: the PCI device
582 */
583void pci_iov_release(struct pci_dev *dev)
584{
585 if (dev->is_physfn)
586 sriov_release(dev);
587}
588
589/**
590 * pci_iov_resource_bar - get position of the SR-IOV BAR
591 * @dev: the PCI device
592 * @resno: the resource number
593 * @type: the BAR type to be filled in
594 *
595 * Returns position of the BAR encapsulated in the SR-IOV capability.
596 */
597int pci_iov_resource_bar(struct pci_dev *dev, int resno,
598 enum pci_bar_type *type)
599{
600 if (resno < PCI_IOV_RESOURCES || resno > PCI_IOV_RESOURCE_END)
601 return 0;
602
603 BUG_ON(!dev->is_physfn);
604
605 *type = pci_bar_unknown;
606
607 return dev->sriov->pos + PCI_SRIOV_BAR +
608 4 * (resno - PCI_IOV_RESOURCES);
609}
Yu Zhao8c5cdb62009-03-20 11:25:12 +0800610
611/**
Chris Wright6faf17f2009-08-28 13:00:06 -0700612 * pci_sriov_resource_alignment - get resource alignment for VF BAR
613 * @dev: the PCI device
614 * @resno: the resource number
615 *
616 * Returns the alignment of the VF BAR found in the SR-IOV capability.
617 * This is not the same as the resource size which is defined as
618 * the VF BAR size multiplied by the number of VFs. The alignment
619 * is just the VF BAR size.
620 */
Cam Macdonell0e522472010-09-07 17:25:20 -0700621resource_size_t pci_sriov_resource_alignment(struct pci_dev *dev, int resno)
Chris Wright6faf17f2009-08-28 13:00:06 -0700622{
623 struct resource tmp;
624 enum pci_bar_type type;
625 int reg = pci_iov_resource_bar(dev, resno, &type);
626
627 if (!reg)
628 return 0;
629
630 __pci_read_base(dev, type, &tmp, reg);
631 return resource_alignment(&tmp);
632}
633
634/**
Yu Zhao8c5cdb62009-03-20 11:25:12 +0800635 * pci_restore_iov_state - restore the state of the IOV capability
636 * @dev: the PCI device
637 */
638void pci_restore_iov_state(struct pci_dev *dev)
639{
640 if (dev->is_physfn)
641 sriov_restore_state(dev);
642}
Yu Zhaoa28724b2009-03-20 11:25:13 +0800643
644/**
645 * pci_iov_bus_range - find bus range used by Virtual Function
646 * @bus: the PCI bus
647 *
648 * Returns max number of buses (exclude current one) used by Virtual
649 * Functions.
650 */
651int pci_iov_bus_range(struct pci_bus *bus)
652{
653 int max = 0;
654 u8 busnr;
655 struct pci_dev *dev;
656
657 list_for_each_entry(dev, &bus->devices, bus_list) {
658 if (!dev->is_physfn)
659 continue;
660 busnr = virtfn_bus(dev, dev->sriov->total - 1);
661 if (busnr > max)
662 max = busnr;
663 }
664
665 return max ? max - bus->number : 0;
666}
Yu Zhaodd7cc442009-03-20 11:25:15 +0800667
668/**
669 * pci_enable_sriov - enable the SR-IOV capability
670 * @dev: the PCI device
Randy Dunlap52a88732009-04-01 17:45:30 -0700671 * @nr_virtfn: number of virtual functions to enable
Yu Zhaodd7cc442009-03-20 11:25:15 +0800672 *
673 * Returns 0 on success, or negative on failure.
674 */
675int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn)
676{
677 might_sleep();
678
679 if (!dev->is_physfn)
680 return -ENODEV;
681
682 return sriov_enable(dev, nr_virtfn);
683}
684EXPORT_SYMBOL_GPL(pci_enable_sriov);
685
686/**
687 * pci_disable_sriov - disable the SR-IOV capability
688 * @dev: the PCI device
689 */
690void pci_disable_sriov(struct pci_dev *dev)
691{
692 might_sleep();
693
694 if (!dev->is_physfn)
695 return;
696
697 sriov_disable(dev);
698}
699EXPORT_SYMBOL_GPL(pci_disable_sriov);
Yu Zhao74bb1bc2009-03-20 11:25:16 +0800700
701/**
702 * pci_sriov_migration - notify SR-IOV core of Virtual Function Migration
703 * @dev: the PCI device
704 *
705 * Returns IRQ_HANDLED if the IRQ is handled, or IRQ_NONE if not.
706 *
707 * Physical Function driver is responsible to register IRQ handler using
708 * VF Migration Interrupt Message Number, and call this function when the
709 * interrupt is generated by the hardware.
710 */
711irqreturn_t pci_sriov_migration(struct pci_dev *dev)
712{
713 if (!dev->is_physfn)
714 return IRQ_NONE;
715
716 return sriov_migration(dev) ? IRQ_HANDLED : IRQ_NONE;
717}
718EXPORT_SYMBOL_GPL(pci_sriov_migration);
Yu Zhao302b4212009-05-18 13:51:32 +0800719
Williams, Mitch Afb8a0d92010-02-10 01:43:04 +0000720/**
721 * pci_num_vf - return number of VFs associated with a PF device_release_driver
722 * @dev: the PCI device
723 *
724 * Returns number of VFs, or 0 if SR-IOV is not enabled.
725 */
726int pci_num_vf(struct pci_dev *dev)
727{
728 if (!dev || !dev->is_physfn)
729 return 0;
730 else
731 return dev->sriov->nr_virtfn;
732}
733EXPORT_SYMBOL_GPL(pci_num_vf);