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 | |
b07579c0 | 22 | int pci_iov_virtfn_bus(struct pci_dev *dev, int vf_id) |
a28724b0 | 23 | { |
b07579c0 WY |
24 | if (!dev->is_physfn) |
25 | return -EINVAL; | |
a28724b0 | 26 | return dev->bus->number + ((dev->devfn + dev->sriov->offset + |
b07579c0 | 27 | dev->sriov->stride * vf_id) >> 8); |
a28724b0 YZ |
28 | } |
29 | ||
b07579c0 | 30 | int pci_iov_virtfn_devfn(struct pci_dev *dev, int vf_id) |
a28724b0 | 31 | { |
b07579c0 WY |
32 | if (!dev->is_physfn) |
33 | return -EINVAL; | |
a28724b0 | 34 | return (dev->devfn + dev->sriov->offset + |
b07579c0 | 35 | dev->sriov->stride * vf_id) & 0xff; |
a28724b0 YZ |
36 | } |
37 | ||
f59dca27 WY |
38 | /* |
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 | */ | |
44 | static 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 | ||
4449f079 WY |
53 | /* |
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 | * | |
57 | * Iterate over all valid NumVFs and calculate the maximum number of bus | |
58 | * numbers that could ever be required. | |
59 | */ | |
60 | static inline u8 virtfn_max_buses(struct pci_dev *dev) | |
61 | { | |
62 | struct pci_sriov *iov = dev->sriov; | |
63 | int nr_virtfn; | |
64 | u8 max = 0; | |
b07579c0 | 65 | int busnr; |
4449f079 WY |
66 | |
67 | for (nr_virtfn = 1; nr_virtfn <= iov->total_VFs; nr_virtfn++) { | |
68 | pci_iov_set_numvfs(dev, nr_virtfn); | |
b07579c0 | 69 | busnr = pci_iov_virtfn_bus(dev, nr_virtfn - 1); |
4449f079 WY |
70 | if (busnr > max) |
71 | max = busnr; | |
72 | } | |
73 | ||
74 | return max; | |
75 | } | |
76 | ||
dd7cc44d YZ |
77 | static struct pci_bus *virtfn_add_bus(struct pci_bus *bus, int busnr) |
78 | { | |
dd7cc44d YZ |
79 | struct pci_bus *child; |
80 | ||
81 | if (bus->number == busnr) | |
82 | return bus; | |
83 | ||
84 | child = pci_find_bus(pci_domain_nr(bus), busnr); | |
85 | if (child) | |
86 | return child; | |
87 | ||
88 | child = pci_add_new_bus(bus, NULL, busnr); | |
89 | if (!child) | |
90 | return NULL; | |
91 | ||
b7eac055 | 92 | pci_bus_insert_busn_res(child, busnr, busnr); |
dd7cc44d YZ |
93 | |
94 | return child; | |
95 | } | |
96 | ||
dc087f2f | 97 | static void virtfn_remove_bus(struct pci_bus *physbus, struct pci_bus *virtbus) |
dd7cc44d | 98 | { |
dc087f2f JL |
99 | if (physbus != virtbus && list_empty(&virtbus->devices)) |
100 | pci_remove_bus(virtbus); | |
dd7cc44d YZ |
101 | } |
102 | ||
0e6c9122 WY |
103 | resource_size_t pci_iov_resource_size(struct pci_dev *dev, int resno) |
104 | { | |
105 | if (!dev->is_physfn) | |
106 | return 0; | |
107 | ||
108 | return dev->sriov->barsz[resno - PCI_IOV_RESOURCES]; | |
109 | } | |
110 | ||
dd7cc44d YZ |
111 | static int virtfn_add(struct pci_dev *dev, int id, int reset) |
112 | { | |
113 | int i; | |
dc087f2f | 114 | int rc = -ENOMEM; |
dd7cc44d YZ |
115 | u64 size; |
116 | char buf[VIRTFN_ID_LEN]; | |
117 | struct pci_dev *virtfn; | |
118 | struct resource *res; | |
119 | struct pci_sriov *iov = dev->sriov; | |
8b1fce04 | 120 | struct pci_bus *bus; |
dd7cc44d | 121 | |
dd7cc44d | 122 | mutex_lock(&iov->dev->sriov->lock); |
b07579c0 | 123 | bus = virtfn_add_bus(dev->bus, pci_iov_virtfn_bus(dev, id)); |
dc087f2f JL |
124 | if (!bus) |
125 | goto failed; | |
126 | ||
127 | virtfn = pci_alloc_dev(bus); | |
dd7cc44d | 128 | if (!virtfn) |
dc087f2f | 129 | goto failed0; |
dd7cc44d | 130 | |
b07579c0 | 131 | virtfn->devfn = pci_iov_virtfn_devfn(dev, id); |
dd7cc44d YZ |
132 | virtfn->vendor = dev->vendor; |
133 | pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_DID, &virtfn->device); | |
134 | pci_setup_device(virtfn); | |
135 | virtfn->dev.parent = dev->dev.parent; | |
fbf33f51 XH |
136 | virtfn->physfn = pci_dev_get(dev); |
137 | virtfn->is_virtfn = 1; | |
aa931977 | 138 | virtfn->multifunction = 0; |
dd7cc44d YZ |
139 | |
140 | for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { | |
c1fe1f96 | 141 | res = &dev->resource[i + PCI_IOV_RESOURCES]; |
dd7cc44d YZ |
142 | if (!res->parent) |
143 | continue; | |
144 | virtfn->resource[i].name = pci_name(virtfn); | |
145 | virtfn->resource[i].flags = res->flags; | |
0e6c9122 | 146 | size = pci_iov_resource_size(dev, i + PCI_IOV_RESOURCES); |
dd7cc44d YZ |
147 | virtfn->resource[i].start = res->start + size * id; |
148 | virtfn->resource[i].end = virtfn->resource[i].start + size - 1; | |
149 | rc = request_resource(res, &virtfn->resource[i]); | |
150 | BUG_ON(rc); | |
151 | } | |
152 | ||
153 | if (reset) | |
8c1c699f | 154 | __pci_reset_function(virtfn); |
dd7cc44d YZ |
155 | |
156 | pci_device_add(virtfn, virtfn->bus); | |
157 | mutex_unlock(&iov->dev->sriov->lock); | |
158 | ||
c893d133 | 159 | pci_bus_add_device(virtfn); |
dd7cc44d YZ |
160 | sprintf(buf, "virtfn%u", id); |
161 | rc = sysfs_create_link(&dev->dev.kobj, &virtfn->dev.kobj, buf); | |
162 | if (rc) | |
163 | goto failed1; | |
164 | rc = sysfs_create_link(&virtfn->dev.kobj, &dev->dev.kobj, "physfn"); | |
165 | if (rc) | |
166 | goto failed2; | |
167 | ||
168 | kobject_uevent(&virtfn->dev.kobj, KOBJ_CHANGE); | |
169 | ||
170 | return 0; | |
171 | ||
172 | failed2: | |
173 | sysfs_remove_link(&dev->dev.kobj, buf); | |
174 | failed1: | |
175 | pci_dev_put(dev); | |
176 | mutex_lock(&iov->dev->sriov->lock); | |
210647af | 177 | pci_stop_and_remove_bus_device(virtfn); |
dc087f2f JL |
178 | failed0: |
179 | virtfn_remove_bus(dev->bus, bus); | |
180 | failed: | |
dd7cc44d YZ |
181 | mutex_unlock(&iov->dev->sriov->lock); |
182 | ||
183 | return rc; | |
184 | } | |
185 | ||
186 | static void virtfn_remove(struct pci_dev *dev, int id, int reset) | |
187 | { | |
188 | char buf[VIRTFN_ID_LEN]; | |
dd7cc44d YZ |
189 | struct pci_dev *virtfn; |
190 | struct pci_sriov *iov = dev->sriov; | |
191 | ||
dc087f2f | 192 | virtfn = pci_get_domain_bus_and_slot(pci_domain_nr(dev->bus), |
b07579c0 WY |
193 | pci_iov_virtfn_bus(dev, id), |
194 | pci_iov_virtfn_devfn(dev, id)); | |
dd7cc44d YZ |
195 | if (!virtfn) |
196 | return; | |
197 | ||
dd7cc44d YZ |
198 | if (reset) { |
199 | device_release_driver(&virtfn->dev); | |
8c1c699f | 200 | __pci_reset_function(virtfn); |
dd7cc44d YZ |
201 | } |
202 | ||
203 | sprintf(buf, "virtfn%u", id); | |
204 | sysfs_remove_link(&dev->dev.kobj, buf); | |
09cedbef YL |
205 | /* |
206 | * pci_stop_dev() could have been called for this virtfn already, | |
207 | * so the directory for the virtfn may have been removed before. | |
208 | * Double check to avoid spurious sysfs warnings. | |
209 | */ | |
210 | if (virtfn->dev.kobj.sd) | |
211 | sysfs_remove_link(&virtfn->dev.kobj, "physfn"); | |
dd7cc44d YZ |
212 | |
213 | mutex_lock(&iov->dev->sriov->lock); | |
210647af | 214 | pci_stop_and_remove_bus_device(virtfn); |
dc087f2f | 215 | virtfn_remove_bus(dev->bus, virtfn->bus); |
dd7cc44d YZ |
216 | mutex_unlock(&iov->dev->sriov->lock); |
217 | ||
dc087f2f JL |
218 | /* balance pci_get_domain_bus_and_slot() */ |
219 | pci_dev_put(virtfn); | |
dd7cc44d YZ |
220 | pci_dev_put(dev); |
221 | } | |
222 | ||
995df527 WY |
223 | int __weak pcibios_sriov_enable(struct pci_dev *pdev, u16 num_vfs) |
224 | { | |
225 | return 0; | |
226 | } | |
227 | ||
dd7cc44d YZ |
228 | static int sriov_enable(struct pci_dev *dev, int nr_virtfn) |
229 | { | |
230 | int rc; | |
231 | int i, j; | |
232 | int nres; | |
233 | u16 offset, stride, initial; | |
234 | struct resource *res; | |
235 | struct pci_dev *pdev; | |
236 | struct pci_sriov *iov = dev->sriov; | |
bbef98ab | 237 | int bars = 0; |
b07579c0 | 238 | int bus; |
995df527 | 239 | int retval; |
dd7cc44d YZ |
240 | |
241 | if (!nr_virtfn) | |
242 | return 0; | |
243 | ||
6b136724 | 244 | if (iov->num_VFs) |
dd7cc44d YZ |
245 | return -EINVAL; |
246 | ||
247 | pci_read_config_word(dev, iov->pos + PCI_SRIOV_INITIAL_VF, &initial); | |
6b136724 BH |
248 | if (initial > iov->total_VFs || |
249 | (!(iov->cap & PCI_SRIOV_CAP_VFM) && (initial != iov->total_VFs))) | |
dd7cc44d YZ |
250 | return -EIO; |
251 | ||
6b136724 | 252 | if (nr_virtfn < 0 || nr_virtfn > iov->total_VFs || |
dd7cc44d YZ |
253 | (!(iov->cap & PCI_SRIOV_CAP_VFM) && (nr_virtfn > initial))) |
254 | return -EINVAL; | |
255 | ||
dd7cc44d YZ |
256 | pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_OFFSET, &offset); |
257 | pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_STRIDE, &stride); | |
258 | if (!offset || (nr_virtfn > 1 && !stride)) | |
259 | return -EIO; | |
260 | ||
261 | nres = 0; | |
262 | for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { | |
bbef98ab | 263 | bars |= (1 << (i + PCI_IOV_RESOURCES)); |
c1fe1f96 | 264 | res = &dev->resource[i + PCI_IOV_RESOURCES]; |
dd7cc44d YZ |
265 | if (res->parent) |
266 | nres++; | |
267 | } | |
268 | if (nres != iov->nres) { | |
269 | dev_err(&dev->dev, "not enough MMIO resources for SR-IOV\n"); | |
270 | return -ENOMEM; | |
271 | } | |
272 | ||
273 | iov->offset = offset; | |
274 | iov->stride = stride; | |
275 | ||
b07579c0 | 276 | bus = pci_iov_virtfn_bus(dev, nr_virtfn - 1); |
68f8e9fa BH |
277 | if (bus > dev->bus->busn_res.end) { |
278 | dev_err(&dev->dev, "can't enable %d VFs (bus %02x out of range of %pR)\n", | |
279 | nr_virtfn, bus, &dev->bus->busn_res); | |
dd7cc44d YZ |
280 | return -ENOMEM; |
281 | } | |
282 | ||
bbef98ab RP |
283 | if (pci_enable_resources(dev, bars)) { |
284 | dev_err(&dev->dev, "SR-IOV: IOV BARS not allocated\n"); | |
285 | return -ENOMEM; | |
286 | } | |
287 | ||
dd7cc44d YZ |
288 | if (iov->link != dev->devfn) { |
289 | pdev = pci_get_slot(dev->bus, iov->link); | |
290 | if (!pdev) | |
291 | return -ENODEV; | |
292 | ||
dc087f2f JL |
293 | if (!pdev->is_physfn) { |
294 | pci_dev_put(pdev); | |
652d1100 | 295 | return -ENOSYS; |
dc087f2f | 296 | } |
dd7cc44d YZ |
297 | |
298 | rc = sysfs_create_link(&dev->dev.kobj, | |
299 | &pdev->dev.kobj, "dep_link"); | |
dc087f2f | 300 | pci_dev_put(pdev); |
dd7cc44d YZ |
301 | if (rc) |
302 | return rc; | |
303 | } | |
304 | ||
f59dca27 | 305 | pci_iov_set_numvfs(dev, nr_virtfn); |
dd7cc44d | 306 | iov->ctrl |= PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE; |
fb51ccbf | 307 | pci_cfg_access_lock(dev); |
dd7cc44d YZ |
308 | pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl); |
309 | msleep(100); | |
fb51ccbf | 310 | pci_cfg_access_unlock(dev); |
dd7cc44d | 311 | |
6b136724 | 312 | iov->initial_VFs = initial; |
dd7cc44d YZ |
313 | if (nr_virtfn < initial) |
314 | initial = nr_virtfn; | |
315 | ||
995df527 WY |
316 | if ((retval = pcibios_sriov_enable(dev, initial))) { |
317 | dev_err(&dev->dev, "failure %d from pcibios_sriov_enable()\n", | |
318 | retval); | |
319 | return retval; | |
320 | } | |
321 | ||
dd7cc44d YZ |
322 | for (i = 0; i < initial; i++) { |
323 | rc = virtfn_add(dev, i, 0); | |
324 | if (rc) | |
325 | goto failed; | |
326 | } | |
327 | ||
328 | kobject_uevent(&dev->dev.kobj, KOBJ_CHANGE); | |
6b136724 | 329 | iov->num_VFs = nr_virtfn; |
dd7cc44d YZ |
330 | |
331 | return 0; | |
332 | ||
333 | failed: | |
334 | for (j = 0; j < i; j++) | |
335 | virtfn_remove(dev, j, 0); | |
336 | ||
337 | iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE); | |
fb51ccbf | 338 | pci_cfg_access_lock(dev); |
dd7cc44d | 339 | pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl); |
f59dca27 | 340 | pci_iov_set_numvfs(dev, 0); |
dd7cc44d | 341 | ssleep(1); |
fb51ccbf | 342 | pci_cfg_access_unlock(dev); |
dd7cc44d YZ |
343 | |
344 | if (iov->link != dev->devfn) | |
345 | sysfs_remove_link(&dev->dev.kobj, "dep_link"); | |
346 | ||
347 | return rc; | |
348 | } | |
349 | ||
995df527 WY |
350 | int __weak pcibios_sriov_disable(struct pci_dev *pdev) |
351 | { | |
352 | return 0; | |
353 | } | |
354 | ||
dd7cc44d YZ |
355 | static void sriov_disable(struct pci_dev *dev) |
356 | { | |
357 | int i; | |
358 | struct pci_sriov *iov = dev->sriov; | |
359 | ||
6b136724 | 360 | if (!iov->num_VFs) |
dd7cc44d YZ |
361 | return; |
362 | ||
6b136724 | 363 | for (i = 0; i < iov->num_VFs; i++) |
dd7cc44d YZ |
364 | virtfn_remove(dev, i, 0); |
365 | ||
995df527 WY |
366 | pcibios_sriov_disable(dev); |
367 | ||
dd7cc44d | 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 | ||
6b136724 | 377 | iov->num_VFs = 0; |
f59dca27 | 378 | pci_iov_set_numvfs(dev, 0); |
dd7cc44d YZ |
379 | } |
380 | ||
d1b054da YZ |
381 | static int sriov_init(struct pci_dev *dev, int pos) |
382 | { | |
0e6c9122 | 383 | int i, bar64; |
d1b054da YZ |
384 | int rc; |
385 | int nres; | |
386 | u32 pgsz; | |
387 | u16 ctrl, total, offset, stride; | |
388 | struct pci_sriov *iov; | |
389 | struct resource *res; | |
390 | struct pci_dev *pdev; | |
391 | ||
62f87c0e YW |
392 | if (pci_pcie_type(dev) != PCI_EXP_TYPE_RC_END && |
393 | pci_pcie_type(dev) != PCI_EXP_TYPE_ENDPOINT) | |
d1b054da YZ |
394 | return -ENODEV; |
395 | ||
396 | pci_read_config_word(dev, pos + PCI_SRIOV_CTRL, &ctrl); | |
397 | if (ctrl & PCI_SRIOV_CTRL_VFE) { | |
398 | pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, 0); | |
399 | ssleep(1); | |
400 | } | |
401 | ||
402 | pci_read_config_word(dev, pos + PCI_SRIOV_TOTAL_VF, &total); | |
403 | if (!total) | |
404 | return 0; | |
405 | ||
406 | ctrl = 0; | |
407 | list_for_each_entry(pdev, &dev->bus->devices, bus_list) | |
408 | if (pdev->is_physfn) | |
409 | goto found; | |
410 | ||
411 | pdev = NULL; | |
412 | if (pci_ari_enabled(dev->bus)) | |
413 | ctrl |= PCI_SRIOV_CTRL_ARI; | |
414 | ||
415 | found: | |
416 | pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, ctrl); | |
045cc22e | 417 | pci_write_config_word(dev, pos + PCI_SRIOV_NUM_VF, 0); |
d1b054da YZ |
418 | pci_read_config_word(dev, pos + PCI_SRIOV_VF_OFFSET, &offset); |
419 | pci_read_config_word(dev, pos + PCI_SRIOV_VF_STRIDE, &stride); | |
420 | if (!offset || (total > 1 && !stride)) | |
421 | return -EIO; | |
422 | ||
423 | pci_read_config_dword(dev, pos + PCI_SRIOV_SUP_PGSIZE, &pgsz); | |
424 | i = PAGE_SHIFT > 12 ? PAGE_SHIFT - 12 : 0; | |
425 | pgsz &= ~((1 << i) - 1); | |
426 | if (!pgsz) | |
427 | return -EIO; | |
428 | ||
429 | pgsz &= ~(pgsz - 1); | |
8161fe91 | 430 | pci_write_config_dword(dev, pos + PCI_SRIOV_SYS_PGSIZE, pgsz); |
d1b054da | 431 | |
0e6c9122 WY |
432 | iov = kzalloc(sizeof(*iov), GFP_KERNEL); |
433 | if (!iov) | |
434 | return -ENOMEM; | |
435 | ||
d1b054da YZ |
436 | nres = 0; |
437 | for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { | |
c1fe1f96 | 438 | res = &dev->resource[i + PCI_IOV_RESOURCES]; |
0e6c9122 WY |
439 | bar64 = __pci_read_base(dev, pci_bar_unknown, res, |
440 | pos + PCI_SRIOV_BAR + i * 4); | |
d1b054da YZ |
441 | if (!res->flags) |
442 | continue; | |
443 | if (resource_size(res) & (PAGE_SIZE - 1)) { | |
444 | rc = -EIO; | |
445 | goto failed; | |
446 | } | |
0e6c9122 | 447 | iov->barsz[i] = resource_size(res); |
d1b054da | 448 | res->end = res->start + resource_size(res) * total - 1; |
e88ae01d WY |
449 | dev_info(&dev->dev, "VF(n) BAR%d space: %pR (contains BAR%d for %d VFs)\n", |
450 | i, res, i, total); | |
0e6c9122 | 451 | i += bar64; |
d1b054da YZ |
452 | nres++; |
453 | } | |
454 | ||
d1b054da YZ |
455 | iov->pos = pos; |
456 | iov->nres = nres; | |
457 | iov->ctrl = ctrl; | |
6b136724 | 458 | iov->total_VFs = total; |
d1b054da YZ |
459 | iov->offset = offset; |
460 | iov->stride = stride; | |
461 | iov->pgsz = pgsz; | |
462 | iov->self = dev; | |
463 | pci_read_config_dword(dev, pos + PCI_SRIOV_CAP, &iov->cap); | |
464 | pci_read_config_byte(dev, pos + PCI_SRIOV_FUNC_LINK, &iov->link); | |
62f87c0e | 465 | if (pci_pcie_type(dev) == PCI_EXP_TYPE_RC_END) |
4d135dbe | 466 | iov->link = PCI_DEVFN(PCI_SLOT(dev->devfn), iov->link); |
d1b054da YZ |
467 | |
468 | if (pdev) | |
469 | iov->dev = pci_dev_get(pdev); | |
e277d2fc | 470 | else |
d1b054da | 471 | iov->dev = dev; |
e277d2fc YZ |
472 | |
473 | mutex_init(&iov->lock); | |
d1b054da YZ |
474 | |
475 | dev->sriov = iov; | |
476 | dev->is_physfn = 1; | |
4449f079 | 477 | iov->max_VF_buses = virtfn_max_buses(dev); |
d1b054da YZ |
478 | |
479 | return 0; | |
480 | ||
481 | failed: | |
482 | for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { | |
c1fe1f96 | 483 | res = &dev->resource[i + PCI_IOV_RESOURCES]; |
d1b054da YZ |
484 | res->flags = 0; |
485 | } | |
486 | ||
0e6c9122 | 487 | kfree(iov); |
d1b054da YZ |
488 | return rc; |
489 | } | |
490 | ||
491 | static void sriov_release(struct pci_dev *dev) | |
492 | { | |
6b136724 | 493 | BUG_ON(dev->sriov->num_VFs); |
dd7cc44d | 494 | |
e277d2fc | 495 | if (dev != dev->sriov->dev) |
d1b054da YZ |
496 | pci_dev_put(dev->sriov->dev); |
497 | ||
e277d2fc YZ |
498 | mutex_destroy(&dev->sriov->lock); |
499 | ||
d1b054da YZ |
500 | kfree(dev->sriov); |
501 | dev->sriov = NULL; | |
502 | } | |
503 | ||
8c5cdb6a YZ |
504 | static void sriov_restore_state(struct pci_dev *dev) |
505 | { | |
506 | int i; | |
507 | u16 ctrl; | |
508 | struct pci_sriov *iov = dev->sriov; | |
509 | ||
510 | pci_read_config_word(dev, iov->pos + PCI_SRIOV_CTRL, &ctrl); | |
511 | if (ctrl & PCI_SRIOV_CTRL_VFE) | |
512 | return; | |
513 | ||
514 | for (i = PCI_IOV_RESOURCES; i <= PCI_IOV_RESOURCE_END; i++) | |
515 | pci_update_resource(dev, i); | |
516 | ||
517 | pci_write_config_dword(dev, iov->pos + PCI_SRIOV_SYS_PGSIZE, iov->pgsz); | |
f59dca27 | 518 | pci_iov_set_numvfs(dev, iov->num_VFs); |
8c5cdb6a YZ |
519 | pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl); |
520 | if (iov->ctrl & PCI_SRIOV_CTRL_VFE) | |
521 | msleep(100); | |
522 | } | |
523 | ||
d1b054da YZ |
524 | /** |
525 | * pci_iov_init - initialize the IOV capability | |
526 | * @dev: the PCI device | |
527 | * | |
528 | * Returns 0 on success, or negative on failure. | |
529 | */ | |
530 | int pci_iov_init(struct pci_dev *dev) | |
531 | { | |
532 | int pos; | |
533 | ||
5f4d91a1 | 534 | if (!pci_is_pcie(dev)) |
d1b054da YZ |
535 | return -ENODEV; |
536 | ||
537 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_SRIOV); | |
538 | if (pos) | |
539 | return sriov_init(dev, pos); | |
540 | ||
541 | return -ENODEV; | |
542 | } | |
543 | ||
544 | /** | |
545 | * pci_iov_release - release resources used by the IOV capability | |
546 | * @dev: the PCI device | |
547 | */ | |
548 | void pci_iov_release(struct pci_dev *dev) | |
549 | { | |
550 | if (dev->is_physfn) | |
551 | sriov_release(dev); | |
552 | } | |
553 | ||
554 | /** | |
555 | * pci_iov_resource_bar - get position of the SR-IOV BAR | |
556 | * @dev: the PCI device | |
557 | * @resno: the resource number | |
d1b054da YZ |
558 | * |
559 | * Returns position of the BAR encapsulated in the SR-IOV capability. | |
560 | */ | |
26ff46c6 | 561 | int pci_iov_resource_bar(struct pci_dev *dev, int resno) |
d1b054da YZ |
562 | { |
563 | if (resno < PCI_IOV_RESOURCES || resno > PCI_IOV_RESOURCE_END) | |
564 | return 0; | |
565 | ||
566 | BUG_ON(!dev->is_physfn); | |
567 | ||
d1b054da YZ |
568 | return dev->sriov->pos + PCI_SRIOV_BAR + |
569 | 4 * (resno - PCI_IOV_RESOURCES); | |
570 | } | |
8c5cdb6a | 571 | |
978d2d68 WY |
572 | resource_size_t __weak pcibios_iov_resource_alignment(struct pci_dev *dev, |
573 | int resno) | |
574 | { | |
575 | return pci_iov_resource_size(dev, resno); | |
576 | } | |
577 | ||
6faf17f6 CW |
578 | /** |
579 | * pci_sriov_resource_alignment - get resource alignment for VF BAR | |
580 | * @dev: the PCI device | |
581 | * @resno: the resource number | |
582 | * | |
583 | * Returns the alignment of the VF BAR found in the SR-IOV capability. | |
584 | * This is not the same as the resource size which is defined as | |
585 | * the VF BAR size multiplied by the number of VFs. The alignment | |
586 | * is just the VF BAR size. | |
587 | */ | |
0e52247a | 588 | resource_size_t pci_sriov_resource_alignment(struct pci_dev *dev, int resno) |
6faf17f6 | 589 | { |
978d2d68 | 590 | return pcibios_iov_resource_alignment(dev, resno); |
6faf17f6 CW |
591 | } |
592 | ||
8c5cdb6a YZ |
593 | /** |
594 | * pci_restore_iov_state - restore the state of the IOV capability | |
595 | * @dev: the PCI device | |
596 | */ | |
597 | void pci_restore_iov_state(struct pci_dev *dev) | |
598 | { | |
599 | if (dev->is_physfn) | |
600 | sriov_restore_state(dev); | |
601 | } | |
a28724b0 YZ |
602 | |
603 | /** | |
604 | * pci_iov_bus_range - find bus range used by Virtual Function | |
605 | * @bus: the PCI bus | |
606 | * | |
607 | * Returns max number of buses (exclude current one) used by Virtual | |
608 | * Functions. | |
609 | */ | |
610 | int pci_iov_bus_range(struct pci_bus *bus) | |
611 | { | |
612 | int max = 0; | |
a28724b0 YZ |
613 | struct pci_dev *dev; |
614 | ||
615 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
616 | if (!dev->is_physfn) | |
617 | continue; | |
4449f079 WY |
618 | if (dev->sriov->max_VF_buses > max) |
619 | max = dev->sriov->max_VF_buses; | |
a28724b0 YZ |
620 | } |
621 | ||
622 | return max ? max - bus->number : 0; | |
623 | } | |
dd7cc44d YZ |
624 | |
625 | /** | |
626 | * pci_enable_sriov - enable the SR-IOV capability | |
627 | * @dev: the PCI device | |
52a8873b | 628 | * @nr_virtfn: number of virtual functions to enable |
dd7cc44d YZ |
629 | * |
630 | * Returns 0 on success, or negative on failure. | |
631 | */ | |
632 | int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn) | |
633 | { | |
634 | might_sleep(); | |
635 | ||
636 | if (!dev->is_physfn) | |
652d1100 | 637 | return -ENOSYS; |
dd7cc44d YZ |
638 | |
639 | return sriov_enable(dev, nr_virtfn); | |
640 | } | |
641 | EXPORT_SYMBOL_GPL(pci_enable_sriov); | |
642 | ||
643 | /** | |
644 | * pci_disable_sriov - disable the SR-IOV capability | |
645 | * @dev: the PCI device | |
646 | */ | |
647 | void pci_disable_sriov(struct pci_dev *dev) | |
648 | { | |
649 | might_sleep(); | |
650 | ||
651 | if (!dev->is_physfn) | |
652 | return; | |
653 | ||
654 | sriov_disable(dev); | |
655 | } | |
656 | EXPORT_SYMBOL_GPL(pci_disable_sriov); | |
74bb1bcc | 657 | |
fb8a0d9d WM |
658 | /** |
659 | * pci_num_vf - return number of VFs associated with a PF device_release_driver | |
660 | * @dev: the PCI device | |
661 | * | |
662 | * Returns number of VFs, or 0 if SR-IOV is not enabled. | |
663 | */ | |
664 | int pci_num_vf(struct pci_dev *dev) | |
665 | { | |
1452cd76 | 666 | if (!dev->is_physfn) |
fb8a0d9d | 667 | return 0; |
1452cd76 BH |
668 | |
669 | return dev->sriov->num_VFs; | |
fb8a0d9d WM |
670 | } |
671 | EXPORT_SYMBOL_GPL(pci_num_vf); | |
bff73156 | 672 | |
5a8eb242 AD |
673 | /** |
674 | * pci_vfs_assigned - returns number of VFs are assigned to a guest | |
675 | * @dev: the PCI device | |
676 | * | |
677 | * Returns number of VFs belonging to this device that are assigned to a guest. | |
652d1100 | 678 | * If device is not a physical function returns 0. |
5a8eb242 AD |
679 | */ |
680 | int pci_vfs_assigned(struct pci_dev *dev) | |
681 | { | |
682 | struct pci_dev *vfdev; | |
683 | unsigned int vfs_assigned = 0; | |
684 | unsigned short dev_id; | |
685 | ||
686 | /* only search if we are a PF */ | |
687 | if (!dev->is_physfn) | |
688 | return 0; | |
689 | ||
690 | /* | |
691 | * determine the device ID for the VFs, the vendor ID will be the | |
692 | * same as the PF so there is no need to check for that one | |
693 | */ | |
694 | pci_read_config_word(dev, dev->sriov->pos + PCI_SRIOV_VF_DID, &dev_id); | |
695 | ||
696 | /* loop through all the VFs to see if we own any that are assigned */ | |
697 | vfdev = pci_get_device(dev->vendor, dev_id, NULL); | |
698 | while (vfdev) { | |
699 | /* | |
700 | * It is considered assigned if it is a virtual function with | |
701 | * our dev as the physical function and the assigned bit is set | |
702 | */ | |
703 | if (vfdev->is_virtfn && (vfdev->physfn == dev) && | |
be63497c | 704 | pci_is_dev_assigned(vfdev)) |
5a8eb242 AD |
705 | vfs_assigned++; |
706 | ||
707 | vfdev = pci_get_device(dev->vendor, dev_id, vfdev); | |
708 | } | |
709 | ||
710 | return vfs_assigned; | |
711 | } | |
712 | EXPORT_SYMBOL_GPL(pci_vfs_assigned); | |
713 | ||
bff73156 DD |
714 | /** |
715 | * pci_sriov_set_totalvfs -- reduce the TotalVFs available | |
716 | * @dev: the PCI PF device | |
2094f167 | 717 | * @numvfs: number that should be used for TotalVFs supported |
bff73156 DD |
718 | * |
719 | * Should be called from PF driver's probe routine with | |
720 | * device's mutex held. | |
721 | * | |
722 | * Returns 0 if PF is an SRIOV-capable device and | |
652d1100 SA |
723 | * value of numvfs valid. If not a PF return -ENOSYS; |
724 | * if numvfs is invalid return -EINVAL; | |
bff73156 DD |
725 | * if VFs already enabled, return -EBUSY. |
726 | */ | |
727 | int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 numvfs) | |
728 | { | |
652d1100 SA |
729 | if (!dev->is_physfn) |
730 | return -ENOSYS; | |
731 | if (numvfs > dev->sriov->total_VFs) | |
bff73156 DD |
732 | return -EINVAL; |
733 | ||
734 | /* Shouldn't change if VFs already enabled */ | |
735 | if (dev->sriov->ctrl & PCI_SRIOV_CTRL_VFE) | |
736 | return -EBUSY; | |
737 | else | |
6b136724 | 738 | dev->sriov->driver_max_VFs = numvfs; |
bff73156 DD |
739 | |
740 | return 0; | |
741 | } | |
742 | EXPORT_SYMBOL_GPL(pci_sriov_set_totalvfs); | |
743 | ||
744 | /** | |
ddc191f5 | 745 | * pci_sriov_get_totalvfs -- get total VFs supported on this device |
bff73156 DD |
746 | * @dev: the PCI PF device |
747 | * | |
748 | * For a PCIe device with SRIOV support, return the PCIe | |
6b136724 | 749 | * SRIOV capability value of TotalVFs or the value of driver_max_VFs |
652d1100 | 750 | * if the driver reduced it. Otherwise 0. |
bff73156 DD |
751 | */ |
752 | int pci_sriov_get_totalvfs(struct pci_dev *dev) | |
753 | { | |
1452cd76 | 754 | if (!dev->is_physfn) |
652d1100 | 755 | return 0; |
bff73156 | 756 | |
6b136724 BH |
757 | if (dev->sriov->driver_max_VFs) |
758 | return dev->sriov->driver_max_VFs; | |
1452cd76 BH |
759 | |
760 | return dev->sriov->total_VFs; | |
bff73156 DD |
761 | } |
762 | EXPORT_SYMBOL_GPL(pci_sriov_get_totalvfs); |