Commit | Line | Data |
---|---|---|
d1b054da YZ |
1 | /* |
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 | |
302b4215 | 8 | * Address Translation Service 1.0 |
d1b054da YZ |
9 | */ |
10 | ||
11 | #include <linux/pci.h> | |
5a0e3ad6 | 12 | #include <linux/slab.h> |
d1b054da | 13 | #include <linux/mutex.h> |
363c75db | 14 | #include <linux/export.h> |
d1b054da YZ |
15 | #include <linux/string.h> |
16 | #include <linux/delay.h> | |
5cdede24 | 17 | #include <linux/pci-ats.h> |
d1b054da YZ |
18 | #include "pci.h" |
19 | ||
dd7cc44d | 20 | #define VIRTFN_ID_LEN 16 |
d1b054da | 21 | |
a28724b0 YZ |
22 | static 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 | ||
28 | static 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 | ||
dd7cc44d YZ |
34 | static struct pci_bus *virtfn_add_bus(struct pci_bus *bus, int busnr) |
35 | { | |
dd7cc44d YZ |
36 | struct pci_bus *child; |
37 | ||
38 | if (bus->number == busnr) | |
39 | return bus; | |
40 | ||
41 | child = pci_find_bus(pci_domain_nr(bus), busnr); | |
42 | if (child) | |
43 | return child; | |
44 | ||
45 | child = pci_add_new_bus(bus, NULL, busnr); | |
46 | if (!child) | |
47 | return NULL; | |
48 | ||
b7eac055 | 49 | pci_bus_insert_busn_res(child, busnr, busnr); |
dd7cc44d YZ |
50 | |
51 | return child; | |
52 | } | |
53 | ||
dc087f2f | 54 | static void virtfn_remove_bus(struct pci_bus *physbus, struct pci_bus *virtbus) |
dd7cc44d | 55 | { |
dc087f2f JL |
56 | if (physbus != virtbus && list_empty(&virtbus->devices)) |
57 | pci_remove_bus(virtbus); | |
dd7cc44d YZ |
58 | } |
59 | ||
60 | static int virtfn_add(struct pci_dev *dev, int id, int reset) | |
61 | { | |
62 | int i; | |
dc087f2f | 63 | int rc = -ENOMEM; |
dd7cc44d YZ |
64 | u64 size; |
65 | char buf[VIRTFN_ID_LEN]; | |
66 | struct pci_dev *virtfn; | |
67 | struct resource *res; | |
68 | struct pci_sriov *iov = dev->sriov; | |
8b1fce04 | 69 | struct pci_bus *bus; |
dd7cc44d | 70 | |
dd7cc44d | 71 | mutex_lock(&iov->dev->sriov->lock); |
8b1fce04 | 72 | bus = virtfn_add_bus(dev->bus, virtfn_bus(dev, id)); |
dc087f2f JL |
73 | if (!bus) |
74 | goto failed; | |
75 | ||
76 | virtfn = pci_alloc_dev(bus); | |
dd7cc44d | 77 | if (!virtfn) |
dc087f2f | 78 | goto failed0; |
dd7cc44d | 79 | |
dd7cc44d YZ |
80 | virtfn->devfn = virtfn_devfn(dev, id); |
81 | virtfn->vendor = dev->vendor; | |
82 | pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_DID, &virtfn->device); | |
83 | pci_setup_device(virtfn); | |
84 | virtfn->dev.parent = dev->dev.parent; | |
fbf33f51 XH |
85 | virtfn->physfn = pci_dev_get(dev); |
86 | virtfn->is_virtfn = 1; | |
dd7cc44d YZ |
87 | |
88 | for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { | |
89 | res = dev->resource + PCI_IOV_RESOURCES + i; | |
90 | if (!res->parent) | |
91 | continue; | |
92 | virtfn->resource[i].name = pci_name(virtfn); | |
93 | virtfn->resource[i].flags = res->flags; | |
94 | size = resource_size(res); | |
6b136724 | 95 | do_div(size, iov->total_VFs); |
dd7cc44d YZ |
96 | virtfn->resource[i].start = res->start + size * id; |
97 | virtfn->resource[i].end = virtfn->resource[i].start + size - 1; | |
98 | rc = request_resource(res, &virtfn->resource[i]); | |
99 | BUG_ON(rc); | |
100 | } | |
101 | ||
102 | if (reset) | |
8c1c699f | 103 | __pci_reset_function(virtfn); |
dd7cc44d YZ |
104 | |
105 | pci_device_add(virtfn, virtfn->bus); | |
106 | mutex_unlock(&iov->dev->sriov->lock); | |
107 | ||
dd7cc44d | 108 | rc = pci_bus_add_device(virtfn); |
dd7cc44d YZ |
109 | sprintf(buf, "virtfn%u", id); |
110 | rc = sysfs_create_link(&dev->dev.kobj, &virtfn->dev.kobj, buf); | |
111 | if (rc) | |
112 | goto failed1; | |
113 | rc = sysfs_create_link(&virtfn->dev.kobj, &dev->dev.kobj, "physfn"); | |
114 | if (rc) | |
115 | goto failed2; | |
116 | ||
117 | kobject_uevent(&virtfn->dev.kobj, KOBJ_CHANGE); | |
118 | ||
119 | return 0; | |
120 | ||
121 | failed2: | |
122 | sysfs_remove_link(&dev->dev.kobj, buf); | |
123 | failed1: | |
124 | pci_dev_put(dev); | |
125 | mutex_lock(&iov->dev->sriov->lock); | |
210647af | 126 | pci_stop_and_remove_bus_device(virtfn); |
dc087f2f JL |
127 | failed0: |
128 | virtfn_remove_bus(dev->bus, bus); | |
129 | failed: | |
dd7cc44d YZ |
130 | mutex_unlock(&iov->dev->sriov->lock); |
131 | ||
132 | return rc; | |
133 | } | |
134 | ||
135 | static void virtfn_remove(struct pci_dev *dev, int id, int reset) | |
136 | { | |
137 | char buf[VIRTFN_ID_LEN]; | |
dd7cc44d YZ |
138 | struct pci_dev *virtfn; |
139 | struct pci_sriov *iov = dev->sriov; | |
140 | ||
dc087f2f JL |
141 | virtfn = pci_get_domain_bus_and_slot(pci_domain_nr(dev->bus), |
142 | virtfn_bus(dev, id), | |
143 | virtfn_devfn(dev, id)); | |
dd7cc44d YZ |
144 | if (!virtfn) |
145 | return; | |
146 | ||
dd7cc44d YZ |
147 | if (reset) { |
148 | device_release_driver(&virtfn->dev); | |
8c1c699f | 149 | __pci_reset_function(virtfn); |
dd7cc44d YZ |
150 | } |
151 | ||
152 | sprintf(buf, "virtfn%u", id); | |
153 | sysfs_remove_link(&dev->dev.kobj, buf); | |
09cedbef YL |
154 | /* |
155 | * pci_stop_dev() could have been called for this virtfn already, | |
156 | * so the directory for the virtfn may have been removed before. | |
157 | * Double check to avoid spurious sysfs warnings. | |
158 | */ | |
159 | if (virtfn->dev.kobj.sd) | |
160 | sysfs_remove_link(&virtfn->dev.kobj, "physfn"); | |
dd7cc44d YZ |
161 | |
162 | mutex_lock(&iov->dev->sriov->lock); | |
210647af | 163 | pci_stop_and_remove_bus_device(virtfn); |
dc087f2f | 164 | virtfn_remove_bus(dev->bus, virtfn->bus); |
dd7cc44d YZ |
165 | mutex_unlock(&iov->dev->sriov->lock); |
166 | ||
dc087f2f JL |
167 | /* balance pci_get_domain_bus_and_slot() */ |
168 | pci_dev_put(virtfn); | |
dd7cc44d YZ |
169 | pci_dev_put(dev); |
170 | } | |
171 | ||
74bb1bcc YZ |
172 | static int sriov_migration(struct pci_dev *dev) |
173 | { | |
174 | u16 status; | |
175 | struct pci_sriov *iov = dev->sriov; | |
176 | ||
6b136724 | 177 | if (!iov->num_VFs) |
74bb1bcc YZ |
178 | return 0; |
179 | ||
180 | if (!(iov->cap & PCI_SRIOV_CAP_VFM)) | |
181 | return 0; | |
182 | ||
183 | pci_read_config_word(dev, iov->pos + PCI_SRIOV_STATUS, &status); | |
184 | if (!(status & PCI_SRIOV_STATUS_VFM)) | |
185 | return 0; | |
186 | ||
187 | schedule_work(&iov->mtask); | |
188 | ||
189 | return 1; | |
190 | } | |
191 | ||
192 | static void sriov_migration_task(struct work_struct *work) | |
193 | { | |
194 | int i; | |
195 | u8 state; | |
196 | u16 status; | |
197 | struct pci_sriov *iov = container_of(work, struct pci_sriov, mtask); | |
198 | ||
6b136724 | 199 | for (i = iov->initial_VFs; i < iov->num_VFs; i++) { |
74bb1bcc YZ |
200 | state = readb(iov->mstate + i); |
201 | if (state == PCI_SRIOV_VFM_MI) { | |
202 | writeb(PCI_SRIOV_VFM_AV, iov->mstate + i); | |
203 | state = readb(iov->mstate + i); | |
204 | if (state == PCI_SRIOV_VFM_AV) | |
205 | virtfn_add(iov->self, i, 1); | |
206 | } else if (state == PCI_SRIOV_VFM_MO) { | |
207 | virtfn_remove(iov->self, i, 1); | |
208 | writeb(PCI_SRIOV_VFM_UA, iov->mstate + i); | |
209 | state = readb(iov->mstate + i); | |
210 | if (state == PCI_SRIOV_VFM_AV) | |
211 | virtfn_add(iov->self, i, 0); | |
212 | } | |
213 | } | |
214 | ||
215 | pci_read_config_word(iov->self, iov->pos + PCI_SRIOV_STATUS, &status); | |
216 | status &= ~PCI_SRIOV_STATUS_VFM; | |
217 | pci_write_config_word(iov->self, iov->pos + PCI_SRIOV_STATUS, status); | |
218 | } | |
219 | ||
220 | static int sriov_enable_migration(struct pci_dev *dev, int nr_virtfn) | |
221 | { | |
222 | int bir; | |
223 | u32 table; | |
224 | resource_size_t pa; | |
225 | struct pci_sriov *iov = dev->sriov; | |
226 | ||
6b136724 | 227 | if (nr_virtfn <= iov->initial_VFs) |
74bb1bcc YZ |
228 | return 0; |
229 | ||
230 | pci_read_config_dword(dev, iov->pos + PCI_SRIOV_VFM, &table); | |
231 | bir = PCI_SRIOV_VFM_BIR(table); | |
232 | if (bir > PCI_STD_RESOURCE_END) | |
233 | return -EIO; | |
234 | ||
235 | table = PCI_SRIOV_VFM_OFFSET(table); | |
236 | if (table + nr_virtfn > pci_resource_len(dev, bir)) | |
237 | return -EIO; | |
238 | ||
239 | pa = pci_resource_start(dev, bir) + table; | |
240 | iov->mstate = ioremap(pa, nr_virtfn); | |
241 | if (!iov->mstate) | |
242 | return -ENOMEM; | |
243 | ||
244 | INIT_WORK(&iov->mtask, sriov_migration_task); | |
245 | ||
246 | iov->ctrl |= PCI_SRIOV_CTRL_VFM | PCI_SRIOV_CTRL_INTR; | |
247 | pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl); | |
248 | ||
249 | return 0; | |
250 | } | |
251 | ||
252 | static void sriov_disable_migration(struct pci_dev *dev) | |
253 | { | |
254 | struct pci_sriov *iov = dev->sriov; | |
255 | ||
256 | iov->ctrl &= ~(PCI_SRIOV_CTRL_VFM | PCI_SRIOV_CTRL_INTR); | |
257 | pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl); | |
258 | ||
259 | cancel_work_sync(&iov->mtask); | |
260 | iounmap(iov->mstate); | |
261 | } | |
262 | ||
dd7cc44d YZ |
263 | static int sriov_enable(struct pci_dev *dev, int nr_virtfn) |
264 | { | |
265 | int rc; | |
266 | int i, j; | |
267 | int nres; | |
268 | u16 offset, stride, initial; | |
269 | struct resource *res; | |
270 | struct pci_dev *pdev; | |
271 | struct pci_sriov *iov = dev->sriov; | |
bbef98ab | 272 | int bars = 0; |
dd7cc44d YZ |
273 | |
274 | if (!nr_virtfn) | |
275 | return 0; | |
276 | ||
6b136724 | 277 | if (iov->num_VFs) |
dd7cc44d YZ |
278 | return -EINVAL; |
279 | ||
280 | pci_read_config_word(dev, iov->pos + PCI_SRIOV_INITIAL_VF, &initial); | |
6b136724 BH |
281 | if (initial > iov->total_VFs || |
282 | (!(iov->cap & PCI_SRIOV_CAP_VFM) && (initial != iov->total_VFs))) | |
dd7cc44d YZ |
283 | return -EIO; |
284 | ||
6b136724 | 285 | if (nr_virtfn < 0 || nr_virtfn > iov->total_VFs || |
dd7cc44d YZ |
286 | (!(iov->cap & PCI_SRIOV_CAP_VFM) && (nr_virtfn > initial))) |
287 | return -EINVAL; | |
288 | ||
289 | pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, nr_virtfn); | |
290 | pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_OFFSET, &offset); | |
291 | pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_STRIDE, &stride); | |
292 | if (!offset || (nr_virtfn > 1 && !stride)) | |
293 | return -EIO; | |
294 | ||
295 | nres = 0; | |
296 | for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { | |
bbef98ab | 297 | bars |= (1 << (i + PCI_IOV_RESOURCES)); |
dd7cc44d YZ |
298 | res = dev->resource + PCI_IOV_RESOURCES + i; |
299 | if (res->parent) | |
300 | nres++; | |
301 | } | |
302 | if (nres != iov->nres) { | |
303 | dev_err(&dev->dev, "not enough MMIO resources for SR-IOV\n"); | |
304 | return -ENOMEM; | |
305 | } | |
306 | ||
307 | iov->offset = offset; | |
308 | iov->stride = stride; | |
309 | ||
b918c62e | 310 | if (virtfn_bus(dev, nr_virtfn - 1) > dev->bus->busn_res.end) { |
dd7cc44d YZ |
311 | dev_err(&dev->dev, "SR-IOV: bus number out of range\n"); |
312 | return -ENOMEM; | |
313 | } | |
314 | ||
bbef98ab RP |
315 | if (pci_enable_resources(dev, bars)) { |
316 | dev_err(&dev->dev, "SR-IOV: IOV BARS not allocated\n"); | |
317 | return -ENOMEM; | |
318 | } | |
319 | ||
dd7cc44d YZ |
320 | if (iov->link != dev->devfn) { |
321 | pdev = pci_get_slot(dev->bus, iov->link); | |
322 | if (!pdev) | |
323 | return -ENODEV; | |
324 | ||
dc087f2f JL |
325 | if (!pdev->is_physfn) { |
326 | pci_dev_put(pdev); | |
dd7cc44d | 327 | return -ENODEV; |
dc087f2f | 328 | } |
dd7cc44d YZ |
329 | |
330 | rc = sysfs_create_link(&dev->dev.kobj, | |
331 | &pdev->dev.kobj, "dep_link"); | |
dc087f2f | 332 | pci_dev_put(pdev); |
dd7cc44d YZ |
333 | if (rc) |
334 | return rc; | |
335 | } | |
336 | ||
337 | iov->ctrl |= PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE; | |
fb51ccbf | 338 | pci_cfg_access_lock(dev); |
dd7cc44d YZ |
339 | pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl); |
340 | msleep(100); | |
fb51ccbf | 341 | pci_cfg_access_unlock(dev); |
dd7cc44d | 342 | |
6b136724 | 343 | iov->initial_VFs = initial; |
dd7cc44d YZ |
344 | if (nr_virtfn < initial) |
345 | initial = nr_virtfn; | |
346 | ||
347 | for (i = 0; i < initial; i++) { | |
348 | rc = virtfn_add(dev, i, 0); | |
349 | if (rc) | |
350 | goto failed; | |
351 | } | |
352 | ||
74bb1bcc YZ |
353 | if (iov->cap & PCI_SRIOV_CAP_VFM) { |
354 | rc = sriov_enable_migration(dev, nr_virtfn); | |
355 | if (rc) | |
356 | goto failed; | |
357 | } | |
358 | ||
dd7cc44d | 359 | kobject_uevent(&dev->dev.kobj, KOBJ_CHANGE); |
6b136724 | 360 | iov->num_VFs = nr_virtfn; |
dd7cc44d YZ |
361 | |
362 | return 0; | |
363 | ||
364 | failed: | |
365 | for (j = 0; j < i; j++) | |
366 | virtfn_remove(dev, j, 0); | |
367 | ||
368 | iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE); | |
fb51ccbf | 369 | pci_cfg_access_lock(dev); |
dd7cc44d YZ |
370 | pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl); |
371 | ssleep(1); | |
fb51ccbf | 372 | pci_cfg_access_unlock(dev); |
dd7cc44d YZ |
373 | |
374 | if (iov->link != dev->devfn) | |
375 | sysfs_remove_link(&dev->dev.kobj, "dep_link"); | |
376 | ||
377 | return rc; | |
378 | } | |
379 | ||
380 | static void sriov_disable(struct pci_dev *dev) | |
381 | { | |
382 | int i; | |
383 | struct pci_sriov *iov = dev->sriov; | |
384 | ||
6b136724 | 385 | if (!iov->num_VFs) |
dd7cc44d YZ |
386 | return; |
387 | ||
74bb1bcc YZ |
388 | if (iov->cap & PCI_SRIOV_CAP_VFM) |
389 | sriov_disable_migration(dev); | |
390 | ||
6b136724 | 391 | for (i = 0; i < iov->num_VFs; i++) |
dd7cc44d YZ |
392 | virtfn_remove(dev, i, 0); |
393 | ||
394 | iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE); | |
fb51ccbf | 395 | pci_cfg_access_lock(dev); |
dd7cc44d YZ |
396 | pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl); |
397 | ssleep(1); | |
fb51ccbf | 398 | pci_cfg_access_unlock(dev); |
dd7cc44d YZ |
399 | |
400 | if (iov->link != dev->devfn) | |
401 | sysfs_remove_link(&dev->dev.kobj, "dep_link"); | |
402 | ||
6b136724 | 403 | iov->num_VFs = 0; |
dd7cc44d YZ |
404 | } |
405 | ||
d1b054da YZ |
406 | static int sriov_init(struct pci_dev *dev, int pos) |
407 | { | |
408 | int i; | |
409 | int rc; | |
410 | int nres; | |
411 | u32 pgsz; | |
412 | u16 ctrl, total, offset, stride; | |
413 | struct pci_sriov *iov; | |
414 | struct resource *res; | |
415 | struct pci_dev *pdev; | |
416 | ||
62f87c0e YW |
417 | if (pci_pcie_type(dev) != PCI_EXP_TYPE_RC_END && |
418 | pci_pcie_type(dev) != PCI_EXP_TYPE_ENDPOINT) | |
d1b054da YZ |
419 | return -ENODEV; |
420 | ||
421 | pci_read_config_word(dev, pos + PCI_SRIOV_CTRL, &ctrl); | |
422 | if (ctrl & PCI_SRIOV_CTRL_VFE) { | |
423 | pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, 0); | |
424 | ssleep(1); | |
425 | } | |
426 | ||
427 | pci_read_config_word(dev, pos + PCI_SRIOV_TOTAL_VF, &total); | |
428 | if (!total) | |
429 | return 0; | |
430 | ||
431 | ctrl = 0; | |
432 | list_for_each_entry(pdev, &dev->bus->devices, bus_list) | |
433 | if (pdev->is_physfn) | |
434 | goto found; | |
435 | ||
436 | pdev = NULL; | |
437 | if (pci_ari_enabled(dev->bus)) | |
438 | ctrl |= PCI_SRIOV_CTRL_ARI; | |
439 | ||
440 | found: | |
441 | pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, ctrl); | |
d1b054da YZ |
442 | pci_read_config_word(dev, pos + PCI_SRIOV_VF_OFFSET, &offset); |
443 | pci_read_config_word(dev, pos + PCI_SRIOV_VF_STRIDE, &stride); | |
444 | if (!offset || (total > 1 && !stride)) | |
445 | return -EIO; | |
446 | ||
447 | pci_read_config_dword(dev, pos + PCI_SRIOV_SUP_PGSIZE, &pgsz); | |
448 | i = PAGE_SHIFT > 12 ? PAGE_SHIFT - 12 : 0; | |
449 | pgsz &= ~((1 << i) - 1); | |
450 | if (!pgsz) | |
451 | return -EIO; | |
452 | ||
453 | pgsz &= ~(pgsz - 1); | |
8161fe91 | 454 | pci_write_config_dword(dev, pos + PCI_SRIOV_SYS_PGSIZE, pgsz); |
d1b054da YZ |
455 | |
456 | nres = 0; | |
457 | for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { | |
458 | res = dev->resource + PCI_IOV_RESOURCES + i; | |
459 | i += __pci_read_base(dev, pci_bar_unknown, res, | |
460 | pos + PCI_SRIOV_BAR + i * 4); | |
461 | if (!res->flags) | |
462 | continue; | |
463 | if (resource_size(res) & (PAGE_SIZE - 1)) { | |
464 | rc = -EIO; | |
465 | goto failed; | |
466 | } | |
467 | res->end = res->start + resource_size(res) * total - 1; | |
468 | nres++; | |
469 | } | |
470 | ||
471 | iov = kzalloc(sizeof(*iov), GFP_KERNEL); | |
472 | if (!iov) { | |
473 | rc = -ENOMEM; | |
474 | goto failed; | |
475 | } | |
476 | ||
477 | iov->pos = pos; | |
478 | iov->nres = nres; | |
479 | iov->ctrl = ctrl; | |
6b136724 | 480 | iov->total_VFs = total; |
d1b054da YZ |
481 | iov->offset = offset; |
482 | iov->stride = stride; | |
483 | iov->pgsz = pgsz; | |
484 | iov->self = dev; | |
485 | pci_read_config_dword(dev, pos + PCI_SRIOV_CAP, &iov->cap); | |
486 | pci_read_config_byte(dev, pos + PCI_SRIOV_FUNC_LINK, &iov->link); | |
62f87c0e | 487 | if (pci_pcie_type(dev) == PCI_EXP_TYPE_RC_END) |
4d135dbe | 488 | iov->link = PCI_DEVFN(PCI_SLOT(dev->devfn), iov->link); |
d1b054da YZ |
489 | |
490 | if (pdev) | |
491 | iov->dev = pci_dev_get(pdev); | |
e277d2fc | 492 | else |
d1b054da | 493 | iov->dev = dev; |
e277d2fc YZ |
494 | |
495 | mutex_init(&iov->lock); | |
d1b054da YZ |
496 | |
497 | dev->sriov = iov; | |
498 | dev->is_physfn = 1; | |
499 | ||
500 | return 0; | |
501 | ||
502 | failed: | |
503 | for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { | |
504 | res = dev->resource + PCI_IOV_RESOURCES + i; | |
505 | res->flags = 0; | |
506 | } | |
507 | ||
508 | return rc; | |
509 | } | |
510 | ||
511 | static void sriov_release(struct pci_dev *dev) | |
512 | { | |
6b136724 | 513 | BUG_ON(dev->sriov->num_VFs); |
dd7cc44d | 514 | |
e277d2fc | 515 | if (dev != dev->sriov->dev) |
d1b054da YZ |
516 | pci_dev_put(dev->sriov->dev); |
517 | ||
e277d2fc YZ |
518 | mutex_destroy(&dev->sriov->lock); |
519 | ||
d1b054da YZ |
520 | kfree(dev->sriov); |
521 | dev->sriov = NULL; | |
522 | } | |
523 | ||
8c5cdb6a YZ |
524 | static void sriov_restore_state(struct pci_dev *dev) |
525 | { | |
526 | int i; | |
527 | u16 ctrl; | |
528 | struct pci_sriov *iov = dev->sriov; | |
529 | ||
530 | pci_read_config_word(dev, iov->pos + PCI_SRIOV_CTRL, &ctrl); | |
531 | if (ctrl & PCI_SRIOV_CTRL_VFE) | |
532 | return; | |
533 | ||
534 | for (i = PCI_IOV_RESOURCES; i <= PCI_IOV_RESOURCE_END; i++) | |
535 | pci_update_resource(dev, i); | |
536 | ||
537 | pci_write_config_dword(dev, iov->pos + PCI_SRIOV_SYS_PGSIZE, iov->pgsz); | |
6b136724 | 538 | pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, iov->num_VFs); |
8c5cdb6a YZ |
539 | pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl); |
540 | if (iov->ctrl & PCI_SRIOV_CTRL_VFE) | |
541 | msleep(100); | |
542 | } | |
543 | ||
d1b054da YZ |
544 | /** |
545 | * pci_iov_init - initialize the IOV capability | |
546 | * @dev: the PCI device | |
547 | * | |
548 | * Returns 0 on success, or negative on failure. | |
549 | */ | |
550 | int pci_iov_init(struct pci_dev *dev) | |
551 | { | |
552 | int pos; | |
553 | ||
5f4d91a1 | 554 | if (!pci_is_pcie(dev)) |
d1b054da YZ |
555 | return -ENODEV; |
556 | ||
557 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_SRIOV); | |
558 | if (pos) | |
559 | return sriov_init(dev, pos); | |
560 | ||
561 | return -ENODEV; | |
562 | } | |
563 | ||
564 | /** | |
565 | * pci_iov_release - release resources used by the IOV capability | |
566 | * @dev: the PCI device | |
567 | */ | |
568 | void pci_iov_release(struct pci_dev *dev) | |
569 | { | |
570 | if (dev->is_physfn) | |
571 | sriov_release(dev); | |
572 | } | |
573 | ||
574 | /** | |
575 | * pci_iov_resource_bar - get position of the SR-IOV BAR | |
576 | * @dev: the PCI device | |
577 | * @resno: the resource number | |
578 | * @type: the BAR type to be filled in | |
579 | * | |
580 | * Returns position of the BAR encapsulated in the SR-IOV capability. | |
581 | */ | |
582 | int pci_iov_resource_bar(struct pci_dev *dev, int resno, | |
583 | enum pci_bar_type *type) | |
584 | { | |
585 | if (resno < PCI_IOV_RESOURCES || resno > PCI_IOV_RESOURCE_END) | |
586 | return 0; | |
587 | ||
588 | BUG_ON(!dev->is_physfn); | |
589 | ||
590 | *type = pci_bar_unknown; | |
591 | ||
592 | return dev->sriov->pos + PCI_SRIOV_BAR + | |
593 | 4 * (resno - PCI_IOV_RESOURCES); | |
594 | } | |
8c5cdb6a | 595 | |
6faf17f6 CW |
596 | /** |
597 | * pci_sriov_resource_alignment - get resource alignment for VF BAR | |
598 | * @dev: the PCI device | |
599 | * @resno: the resource number | |
600 | * | |
601 | * Returns the alignment of the VF BAR found in the SR-IOV capability. | |
602 | * This is not the same as the resource size which is defined as | |
603 | * the VF BAR size multiplied by the number of VFs. The alignment | |
604 | * is just the VF BAR size. | |
605 | */ | |
0e52247a | 606 | resource_size_t pci_sriov_resource_alignment(struct pci_dev *dev, int resno) |
6faf17f6 CW |
607 | { |
608 | struct resource tmp; | |
609 | enum pci_bar_type type; | |
610 | int reg = pci_iov_resource_bar(dev, resno, &type); | |
611 | ||
612 | if (!reg) | |
613 | return 0; | |
614 | ||
615 | __pci_read_base(dev, type, &tmp, reg); | |
616 | return resource_alignment(&tmp); | |
617 | } | |
618 | ||
8c5cdb6a YZ |
619 | /** |
620 | * pci_restore_iov_state - restore the state of the IOV capability | |
621 | * @dev: the PCI device | |
622 | */ | |
623 | void pci_restore_iov_state(struct pci_dev *dev) | |
624 | { | |
625 | if (dev->is_physfn) | |
626 | sriov_restore_state(dev); | |
627 | } | |
a28724b0 YZ |
628 | |
629 | /** | |
630 | * pci_iov_bus_range - find bus range used by Virtual Function | |
631 | * @bus: the PCI bus | |
632 | * | |
633 | * Returns max number of buses (exclude current one) used by Virtual | |
634 | * Functions. | |
635 | */ | |
636 | int pci_iov_bus_range(struct pci_bus *bus) | |
637 | { | |
638 | int max = 0; | |
639 | u8 busnr; | |
640 | struct pci_dev *dev; | |
641 | ||
642 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
643 | if (!dev->is_physfn) | |
644 | continue; | |
6b136724 | 645 | busnr = virtfn_bus(dev, dev->sriov->total_VFs - 1); |
a28724b0 YZ |
646 | if (busnr > max) |
647 | max = busnr; | |
648 | } | |
649 | ||
650 | return max ? max - bus->number : 0; | |
651 | } | |
dd7cc44d YZ |
652 | |
653 | /** | |
654 | * pci_enable_sriov - enable the SR-IOV capability | |
655 | * @dev: the PCI device | |
52a8873b | 656 | * @nr_virtfn: number of virtual functions to enable |
dd7cc44d YZ |
657 | * |
658 | * Returns 0 on success, or negative on failure. | |
659 | */ | |
660 | int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn) | |
661 | { | |
662 | might_sleep(); | |
663 | ||
664 | if (!dev->is_physfn) | |
665 | return -ENODEV; | |
666 | ||
667 | return sriov_enable(dev, nr_virtfn); | |
668 | } | |
669 | EXPORT_SYMBOL_GPL(pci_enable_sriov); | |
670 | ||
671 | /** | |
672 | * pci_disable_sriov - disable the SR-IOV capability | |
673 | * @dev: the PCI device | |
674 | */ | |
675 | void pci_disable_sriov(struct pci_dev *dev) | |
676 | { | |
677 | might_sleep(); | |
678 | ||
679 | if (!dev->is_physfn) | |
680 | return; | |
681 | ||
682 | sriov_disable(dev); | |
683 | } | |
684 | EXPORT_SYMBOL_GPL(pci_disable_sriov); | |
74bb1bcc YZ |
685 | |
686 | /** | |
687 | * pci_sriov_migration - notify SR-IOV core of Virtual Function Migration | |
688 | * @dev: the PCI device | |
689 | * | |
690 | * Returns IRQ_HANDLED if the IRQ is handled, or IRQ_NONE if not. | |
691 | * | |
692 | * Physical Function driver is responsible to register IRQ handler using | |
693 | * VF Migration Interrupt Message Number, and call this function when the | |
694 | * interrupt is generated by the hardware. | |
695 | */ | |
696 | irqreturn_t pci_sriov_migration(struct pci_dev *dev) | |
697 | { | |
698 | if (!dev->is_physfn) | |
699 | return IRQ_NONE; | |
700 | ||
701 | return sriov_migration(dev) ? IRQ_HANDLED : IRQ_NONE; | |
702 | } | |
703 | EXPORT_SYMBOL_GPL(pci_sriov_migration); | |
302b4215 | 704 | |
fb8a0d9d WM |
705 | /** |
706 | * pci_num_vf - return number of VFs associated with a PF device_release_driver | |
707 | * @dev: the PCI device | |
708 | * | |
709 | * Returns number of VFs, or 0 if SR-IOV is not enabled. | |
710 | */ | |
711 | int pci_num_vf(struct pci_dev *dev) | |
712 | { | |
1452cd76 | 713 | if (!dev->is_physfn) |
fb8a0d9d | 714 | return 0; |
1452cd76 BH |
715 | |
716 | return dev->sriov->num_VFs; | |
fb8a0d9d WM |
717 | } |
718 | EXPORT_SYMBOL_GPL(pci_num_vf); | |
bff73156 | 719 | |
5a8eb242 AD |
720 | /** |
721 | * pci_vfs_assigned - returns number of VFs are assigned to a guest | |
722 | * @dev: the PCI device | |
723 | * | |
724 | * Returns number of VFs belonging to this device that are assigned to a guest. | |
725 | * If device is not a physical function returns -ENODEV. | |
726 | */ | |
727 | int pci_vfs_assigned(struct pci_dev *dev) | |
728 | { | |
729 | struct pci_dev *vfdev; | |
730 | unsigned int vfs_assigned = 0; | |
731 | unsigned short dev_id; | |
732 | ||
733 | /* only search if we are a PF */ | |
734 | if (!dev->is_physfn) | |
735 | return 0; | |
736 | ||
737 | /* | |
738 | * determine the device ID for the VFs, the vendor ID will be the | |
739 | * same as the PF so there is no need to check for that one | |
740 | */ | |
741 | pci_read_config_word(dev, dev->sriov->pos + PCI_SRIOV_VF_DID, &dev_id); | |
742 | ||
743 | /* loop through all the VFs to see if we own any that are assigned */ | |
744 | vfdev = pci_get_device(dev->vendor, dev_id, NULL); | |
745 | while (vfdev) { | |
746 | /* | |
747 | * It is considered assigned if it is a virtual function with | |
748 | * our dev as the physical function and the assigned bit is set | |
749 | */ | |
750 | if (vfdev->is_virtfn && (vfdev->physfn == dev) && | |
751 | (vfdev->dev_flags & PCI_DEV_FLAGS_ASSIGNED)) | |
752 | vfs_assigned++; | |
753 | ||
754 | vfdev = pci_get_device(dev->vendor, dev_id, vfdev); | |
755 | } | |
756 | ||
757 | return vfs_assigned; | |
758 | } | |
759 | EXPORT_SYMBOL_GPL(pci_vfs_assigned); | |
760 | ||
bff73156 DD |
761 | /** |
762 | * pci_sriov_set_totalvfs -- reduce the TotalVFs available | |
763 | * @dev: the PCI PF device | |
2094f167 | 764 | * @numvfs: number that should be used for TotalVFs supported |
bff73156 DD |
765 | * |
766 | * Should be called from PF driver's probe routine with | |
767 | * device's mutex held. | |
768 | * | |
769 | * Returns 0 if PF is an SRIOV-capable device and | |
770 | * value of numvfs valid. If not a PF with VFS, return -EINVAL; | |
771 | * if VFs already enabled, return -EBUSY. | |
772 | */ | |
773 | int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 numvfs) | |
774 | { | |
1452cd76 | 775 | if (!dev->is_physfn || (numvfs > dev->sriov->total_VFs)) |
bff73156 DD |
776 | return -EINVAL; |
777 | ||
778 | /* Shouldn't change if VFs already enabled */ | |
779 | if (dev->sriov->ctrl & PCI_SRIOV_CTRL_VFE) | |
780 | return -EBUSY; | |
781 | else | |
6b136724 | 782 | dev->sriov->driver_max_VFs = numvfs; |
bff73156 DD |
783 | |
784 | return 0; | |
785 | } | |
786 | EXPORT_SYMBOL_GPL(pci_sriov_set_totalvfs); | |
787 | ||
788 | /** | |
789 | * pci_sriov_get_totalvfs -- get total VFs supported on this devic3 | |
790 | * @dev: the PCI PF device | |
791 | * | |
792 | * For a PCIe device with SRIOV support, return the PCIe | |
6b136724 | 793 | * SRIOV capability value of TotalVFs or the value of driver_max_VFs |
bff73156 DD |
794 | * if the driver reduced it. Otherwise, -EINVAL. |
795 | */ | |
796 | int pci_sriov_get_totalvfs(struct pci_dev *dev) | |
797 | { | |
1452cd76 | 798 | if (!dev->is_physfn) |
bff73156 DD |
799 | return -EINVAL; |
800 | ||
6b136724 BH |
801 | if (dev->sriov->driver_max_VFs) |
802 | return dev->sriov->driver_max_VFs; | |
1452cd76 BH |
803 | |
804 | return dev->sriov->total_VFs; | |
bff73156 DD |
805 | } |
806 | EXPORT_SYMBOL_GPL(pci_sriov_get_totalvfs); |