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7328c8f4 | 1 | // SPDX-License-Identifier: GPL-2.0 |
db3c33c6 | 2 | /* |
df62ab5e | 3 | * PCI Express I/O Virtualization (IOV) support |
db3c33c6 | 4 | * Address Translation Service 1.0 |
c320b976 | 5 | * Page Request Interface added by Joerg Roedel <joerg.roedel@amd.com> |
086ac11f | 6 | * PASID support added by Joerg Roedel <joerg.roedel@amd.com> |
df62ab5e BH |
7 | * |
8 | * Copyright (C) 2009 Intel Corporation, Yu Zhao <yu.zhao@intel.com> | |
9 | * Copyright (C) 2011 Advanced Micro Devices, | |
db3c33c6 JR |
10 | */ |
11 | ||
363c75db | 12 | #include <linux/export.h> |
db3c33c6 JR |
13 | #include <linux/pci-ats.h> |
14 | #include <linux/pci.h> | |
8c451945 | 15 | #include <linux/slab.h> |
db3c33c6 JR |
16 | |
17 | #include "pci.h" | |
18 | ||
afdd596c | 19 | void pci_ats_init(struct pci_dev *dev) |
db3c33c6 JR |
20 | { |
21 | int pos; | |
db3c33c6 | 22 | |
cef74409 GK |
23 | if (pci_ats_disabled()) |
24 | return; | |
25 | ||
db3c33c6 JR |
26 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ATS); |
27 | if (!pos) | |
edc90fee | 28 | return; |
db3c33c6 | 29 | |
d544d75a | 30 | dev->ats_cap = pos; |
db3c33c6 JR |
31 | } |
32 | ||
33 | /** | |
34 | * pci_enable_ats - enable the ATS capability | |
35 | * @dev: the PCI device | |
36 | * @ps: the IOMMU page shift | |
37 | * | |
38 | * Returns 0 on success, or negative on failure. | |
39 | */ | |
40 | int pci_enable_ats(struct pci_dev *dev, int ps) | |
41 | { | |
db3c33c6 | 42 | u16 ctrl; |
c39127db | 43 | struct pci_dev *pdev; |
db3c33c6 | 44 | |
d544d75a | 45 | if (!dev->ats_cap) |
edc90fee BH |
46 | return -EINVAL; |
47 | ||
f7ef1340 | 48 | if (WARN_ON(dev->ats_enabled)) |
a021f301 BH |
49 | return -EBUSY; |
50 | ||
db3c33c6 JR |
51 | if (ps < PCI_ATS_MIN_STU) |
52 | return -EINVAL; | |
53 | ||
edc90fee BH |
54 | /* |
55 | * Note that enabling ATS on a VF fails unless it's already enabled | |
56 | * with the same STU on the PF. | |
57 | */ | |
58 | ctrl = PCI_ATS_CTRL_ENABLE; | |
59 | if (dev->is_virtfn) { | |
c39127db | 60 | pdev = pci_physfn(dev); |
d544d75a | 61 | if (pdev->ats_stu != ps) |
edc90fee | 62 | return -EINVAL; |
db3c33c6 | 63 | |
d544d75a | 64 | atomic_inc(&pdev->ats_ref_cnt); /* count enabled VFs */ |
edc90fee | 65 | } else { |
d544d75a BH |
66 | dev->ats_stu = ps; |
67 | ctrl |= PCI_ATS_CTRL_STU(dev->ats_stu - PCI_ATS_MIN_STU); | |
db3c33c6 | 68 | } |
d544d75a | 69 | pci_write_config_word(dev, dev->ats_cap + PCI_ATS_CTRL, ctrl); |
db3c33c6 | 70 | |
d544d75a | 71 | dev->ats_enabled = 1; |
db3c33c6 JR |
72 | return 0; |
73 | } | |
d4c0636c | 74 | EXPORT_SYMBOL_GPL(pci_enable_ats); |
db3c33c6 JR |
75 | |
76 | /** | |
77 | * pci_disable_ats - disable the ATS capability | |
78 | * @dev: the PCI device | |
79 | */ | |
80 | void pci_disable_ats(struct pci_dev *dev) | |
81 | { | |
c39127db | 82 | struct pci_dev *pdev; |
db3c33c6 JR |
83 | u16 ctrl; |
84 | ||
f7ef1340 | 85 | if (WARN_ON(!dev->ats_enabled)) |
a021f301 | 86 | return; |
db3c33c6 | 87 | |
d544d75a | 88 | if (atomic_read(&dev->ats_ref_cnt)) |
edc90fee BH |
89 | return; /* VFs still enabled */ |
90 | ||
91 | if (dev->is_virtfn) { | |
c39127db | 92 | pdev = pci_physfn(dev); |
d544d75a | 93 | atomic_dec(&pdev->ats_ref_cnt); |
edc90fee BH |
94 | } |
95 | ||
d544d75a | 96 | pci_read_config_word(dev, dev->ats_cap + PCI_ATS_CTRL, &ctrl); |
db3c33c6 | 97 | ctrl &= ~PCI_ATS_CTRL_ENABLE; |
d544d75a | 98 | pci_write_config_word(dev, dev->ats_cap + PCI_ATS_CTRL, ctrl); |
db3c33c6 | 99 | |
d544d75a | 100 | dev->ats_enabled = 0; |
db3c33c6 | 101 | } |
d4c0636c | 102 | EXPORT_SYMBOL_GPL(pci_disable_ats); |
db3c33c6 | 103 | |
1900ca13 HX |
104 | void pci_restore_ats_state(struct pci_dev *dev) |
105 | { | |
106 | u16 ctrl; | |
107 | ||
f7ef1340 | 108 | if (!dev->ats_enabled) |
1900ca13 | 109 | return; |
1900ca13 HX |
110 | |
111 | ctrl = PCI_ATS_CTRL_ENABLE; | |
112 | if (!dev->is_virtfn) | |
d544d75a BH |
113 | ctrl |= PCI_ATS_CTRL_STU(dev->ats_stu - PCI_ATS_MIN_STU); |
114 | pci_write_config_word(dev, dev->ats_cap + PCI_ATS_CTRL, ctrl); | |
1900ca13 HX |
115 | } |
116 | EXPORT_SYMBOL_GPL(pci_restore_ats_state); | |
117 | ||
db3c33c6 JR |
118 | /** |
119 | * pci_ats_queue_depth - query the ATS Invalidate Queue Depth | |
120 | * @dev: the PCI device | |
121 | * | |
122 | * Returns the queue depth on success, or negative on failure. | |
123 | * | |
124 | * The ATS spec uses 0 in the Invalidate Queue Depth field to | |
125 | * indicate that the function can accept 32 Invalidate Request. | |
126 | * But here we use the `real' values (i.e. 1~32) for the Queue | |
127 | * Depth; and 0 indicates the function shares the Queue with | |
128 | * other functions (doesn't exclusively own a Queue). | |
129 | */ | |
130 | int pci_ats_queue_depth(struct pci_dev *dev) | |
131 | { | |
a71f938f BH |
132 | u16 cap; |
133 | ||
3c765399 BH |
134 | if (!dev->ats_cap) |
135 | return -EINVAL; | |
136 | ||
db3c33c6 JR |
137 | if (dev->is_virtfn) |
138 | return 0; | |
139 | ||
a71f938f BH |
140 | pci_read_config_word(dev, dev->ats_cap + PCI_ATS_CAP, &cap); |
141 | return PCI_ATS_CAP_QDEP(cap) ? PCI_ATS_CAP_QDEP(cap) : PCI_ATS_MAX_QDEP; | |
db3c33c6 | 142 | } |
d4c0636c | 143 | EXPORT_SYMBOL_GPL(pci_ats_queue_depth); |
c320b976 | 144 | |
8c938ddc KS |
145 | /** |
146 | * pci_ats_page_aligned - Return Page Aligned Request bit status. | |
147 | * @pdev: the PCI device | |
148 | * | |
149 | * Returns 1, if the Untranslated Addresses generated by the device | |
150 | * are always aligned or 0 otherwise. | |
151 | * | |
152 | * Per PCIe spec r4.0, sec 10.5.1.2, if the Page Aligned Request bit | |
153 | * is set, it indicates the Untranslated Addresses generated by the | |
154 | * device are always aligned to a 4096 byte boundary. | |
155 | */ | |
156 | int pci_ats_page_aligned(struct pci_dev *pdev) | |
157 | { | |
158 | u16 cap; | |
159 | ||
160 | if (!pdev->ats_cap) | |
161 | return 0; | |
162 | ||
163 | pci_read_config_word(pdev, pdev->ats_cap + PCI_ATS_CAP, &cap); | |
164 | ||
165 | if (cap & PCI_ATS_CAP_PAGE_ALIGNED) | |
166 | return 1; | |
167 | ||
168 | return 0; | |
169 | } | |
170 | EXPORT_SYMBOL_GPL(pci_ats_page_aligned); | |
171 | ||
c320b976 JR |
172 | #ifdef CONFIG_PCI_PRI |
173 | /** | |
174 | * pci_enable_pri - Enable PRI capability | |
175 | * @ pdev: PCI device structure | |
176 | * | |
177 | * Returns 0 on success, negative value on error | |
178 | */ | |
179 | int pci_enable_pri(struct pci_dev *pdev, u32 reqs) | |
180 | { | |
181 | u16 control, status; | |
182 | u32 max_requests; | |
183 | int pos; | |
184 | ||
a4f4fa68 JPB |
185 | if (WARN_ON(pdev->pri_enabled)) |
186 | return -EBUSY; | |
187 | ||
69166fbf | 188 | pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI); |
c320b976 JR |
189 | if (!pos) |
190 | return -EINVAL; | |
191 | ||
91f57d5e | 192 | pci_read_config_word(pdev, pos + PCI_PRI_STATUS, &status); |
4ebeb1ec | 193 | if (!(status & PCI_PRI_STATUS_STOPPED)) |
c320b976 JR |
194 | return -EBUSY; |
195 | ||
91f57d5e | 196 | pci_read_config_dword(pdev, pos + PCI_PRI_MAX_REQ, &max_requests); |
c320b976 | 197 | reqs = min(max_requests, reqs); |
4ebeb1ec | 198 | pdev->pri_reqs_alloc = reqs; |
91f57d5e | 199 | pci_write_config_dword(pdev, pos + PCI_PRI_ALLOC_REQ, reqs); |
c320b976 | 200 | |
4ebeb1ec | 201 | control = PCI_PRI_CTRL_ENABLE; |
91f57d5e | 202 | pci_write_config_word(pdev, pos + PCI_PRI_CTRL, control); |
c320b976 | 203 | |
a4f4fa68 JPB |
204 | pdev->pri_enabled = 1; |
205 | ||
c320b976 JR |
206 | return 0; |
207 | } | |
208 | EXPORT_SYMBOL_GPL(pci_enable_pri); | |
209 | ||
210 | /** | |
211 | * pci_disable_pri - Disable PRI capability | |
212 | * @pdev: PCI device structure | |
213 | * | |
214 | * Only clears the enabled-bit, regardless of its former value | |
215 | */ | |
216 | void pci_disable_pri(struct pci_dev *pdev) | |
217 | { | |
218 | u16 control; | |
219 | int pos; | |
220 | ||
a4f4fa68 JPB |
221 | if (WARN_ON(!pdev->pri_enabled)) |
222 | return; | |
223 | ||
69166fbf | 224 | pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI); |
c320b976 JR |
225 | if (!pos) |
226 | return; | |
227 | ||
91f57d5e AW |
228 | pci_read_config_word(pdev, pos + PCI_PRI_CTRL, &control); |
229 | control &= ~PCI_PRI_CTRL_ENABLE; | |
230 | pci_write_config_word(pdev, pos + PCI_PRI_CTRL, control); | |
a4f4fa68 JPB |
231 | |
232 | pdev->pri_enabled = 0; | |
c320b976 JR |
233 | } |
234 | EXPORT_SYMBOL_GPL(pci_disable_pri); | |
235 | ||
4ebeb1ec CT |
236 | /** |
237 | * pci_restore_pri_state - Restore PRI | |
238 | * @pdev: PCI device structure | |
239 | */ | |
240 | void pci_restore_pri_state(struct pci_dev *pdev) | |
241 | { | |
242 | u16 control = PCI_PRI_CTRL_ENABLE; | |
243 | u32 reqs = pdev->pri_reqs_alloc; | |
244 | int pos; | |
245 | ||
246 | if (!pdev->pri_enabled) | |
247 | return; | |
248 | ||
249 | pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI); | |
250 | if (!pos) | |
251 | return; | |
252 | ||
253 | pci_write_config_dword(pdev, pos + PCI_PRI_ALLOC_REQ, reqs); | |
254 | pci_write_config_word(pdev, pos + PCI_PRI_CTRL, control); | |
255 | } | |
256 | EXPORT_SYMBOL_GPL(pci_restore_pri_state); | |
257 | ||
c320b976 JR |
258 | /** |
259 | * pci_reset_pri - Resets device's PRI state | |
260 | * @pdev: PCI device structure | |
261 | * | |
262 | * The PRI capability must be disabled before this function is called. | |
263 | * Returns 0 on success, negative value on error. | |
264 | */ | |
265 | int pci_reset_pri(struct pci_dev *pdev) | |
266 | { | |
267 | u16 control; | |
268 | int pos; | |
269 | ||
a4f4fa68 JPB |
270 | if (WARN_ON(pdev->pri_enabled)) |
271 | return -EBUSY; | |
272 | ||
69166fbf | 273 | pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI); |
c320b976 JR |
274 | if (!pos) |
275 | return -EINVAL; | |
276 | ||
4ebeb1ec | 277 | control = PCI_PRI_CTRL_RESET; |
91f57d5e | 278 | pci_write_config_word(pdev, pos + PCI_PRI_CTRL, control); |
c320b976 JR |
279 | |
280 | return 0; | |
281 | } | |
282 | EXPORT_SYMBOL_GPL(pci_reset_pri); | |
c320b976 | 283 | #endif /* CONFIG_PCI_PRI */ |
086ac11f JR |
284 | |
285 | #ifdef CONFIG_PCI_PASID | |
286 | /** | |
287 | * pci_enable_pasid - Enable the PASID capability | |
288 | * @pdev: PCI device structure | |
289 | * @features: Features to enable | |
290 | * | |
291 | * Returns 0 on success, negative value on error. This function checks | |
292 | * whether the features are actually supported by the device and returns | |
293 | * an error if not. | |
294 | */ | |
295 | int pci_enable_pasid(struct pci_dev *pdev, int features) | |
296 | { | |
297 | u16 control, supported; | |
298 | int pos; | |
299 | ||
a4f4fa68 JPB |
300 | if (WARN_ON(pdev->pasid_enabled)) |
301 | return -EBUSY; | |
302 | ||
7ce3f912 SK |
303 | if (!pdev->eetlp_prefix_path) |
304 | return -EINVAL; | |
305 | ||
69166fbf | 306 | pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PASID); |
086ac11f JR |
307 | if (!pos) |
308 | return -EINVAL; | |
309 | ||
91f57d5e | 310 | pci_read_config_word(pdev, pos + PCI_PASID_CAP, &supported); |
91f57d5e | 311 | supported &= PCI_PASID_CAP_EXEC | PCI_PASID_CAP_PRIV; |
086ac11f JR |
312 | |
313 | /* User wants to enable anything unsupported? */ | |
314 | if ((supported & features) != features) | |
315 | return -EINVAL; | |
316 | ||
91f57d5e | 317 | control = PCI_PASID_CTRL_ENABLE | features; |
4ebeb1ec | 318 | pdev->pasid_features = features; |
086ac11f | 319 | |
91f57d5e | 320 | pci_write_config_word(pdev, pos + PCI_PASID_CTRL, control); |
086ac11f | 321 | |
a4f4fa68 JPB |
322 | pdev->pasid_enabled = 1; |
323 | ||
086ac11f JR |
324 | return 0; |
325 | } | |
326 | EXPORT_SYMBOL_GPL(pci_enable_pasid); | |
327 | ||
328 | /** | |
329 | * pci_disable_pasid - Disable the PASID capability | |
330 | * @pdev: PCI device structure | |
086ac11f JR |
331 | */ |
332 | void pci_disable_pasid(struct pci_dev *pdev) | |
333 | { | |
334 | u16 control = 0; | |
335 | int pos; | |
336 | ||
a4f4fa68 JPB |
337 | if (WARN_ON(!pdev->pasid_enabled)) |
338 | return; | |
339 | ||
69166fbf | 340 | pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PASID); |
086ac11f JR |
341 | if (!pos) |
342 | return; | |
343 | ||
91f57d5e | 344 | pci_write_config_word(pdev, pos + PCI_PASID_CTRL, control); |
a4f4fa68 JPB |
345 | |
346 | pdev->pasid_enabled = 0; | |
086ac11f JR |
347 | } |
348 | EXPORT_SYMBOL_GPL(pci_disable_pasid); | |
349 | ||
4ebeb1ec CT |
350 | /** |
351 | * pci_restore_pasid_state - Restore PASID capabilities | |
352 | * @pdev: PCI device structure | |
353 | */ | |
354 | void pci_restore_pasid_state(struct pci_dev *pdev) | |
355 | { | |
356 | u16 control; | |
357 | int pos; | |
358 | ||
359 | if (!pdev->pasid_enabled) | |
360 | return; | |
361 | ||
362 | pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PASID); | |
363 | if (!pos) | |
364 | return; | |
365 | ||
366 | control = PCI_PASID_CTRL_ENABLE | pdev->pasid_features; | |
367 | pci_write_config_word(pdev, pos + PCI_PASID_CTRL, control); | |
368 | } | |
369 | EXPORT_SYMBOL_GPL(pci_restore_pasid_state); | |
370 | ||
086ac11f JR |
371 | /** |
372 | * pci_pasid_features - Check which PASID features are supported | |
373 | * @pdev: PCI device structure | |
374 | * | |
375 | * Returns a negative value when no PASI capability is present. | |
376 | * Otherwise is returns a bitmask with supported features. Current | |
377 | * features reported are: | |
91f57d5e | 378 | * PCI_PASID_CAP_EXEC - Execute permission supported |
f7625980 | 379 | * PCI_PASID_CAP_PRIV - Privileged mode supported |
086ac11f JR |
380 | */ |
381 | int pci_pasid_features(struct pci_dev *pdev) | |
382 | { | |
383 | u16 supported; | |
384 | int pos; | |
385 | ||
69166fbf | 386 | pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PASID); |
086ac11f JR |
387 | if (!pos) |
388 | return -EINVAL; | |
389 | ||
91f57d5e | 390 | pci_read_config_word(pdev, pos + PCI_PASID_CAP, &supported); |
086ac11f | 391 | |
91f57d5e | 392 | supported &= PCI_PASID_CAP_EXEC | PCI_PASID_CAP_PRIV; |
086ac11f JR |
393 | |
394 | return supported; | |
395 | } | |
396 | EXPORT_SYMBOL_GPL(pci_pasid_features); | |
397 | ||
e5567f5f KS |
398 | /** |
399 | * pci_prg_resp_pasid_required - Return PRG Response PASID Required bit | |
400 | * status. | |
401 | * @pdev: PCI device structure | |
402 | * | |
403 | * Returns 1 if PASID is required in PRG Response Message, 0 otherwise. | |
404 | * | |
405 | * Even though the PRG response PASID status is read from PRI Status | |
406 | * Register, since this API will mainly be used by PASID users, this | |
407 | * function is defined within #ifdef CONFIG_PCI_PASID instead of | |
408 | * CONFIG_PCI_PRI. | |
409 | */ | |
410 | int pci_prg_resp_pasid_required(struct pci_dev *pdev) | |
411 | { | |
412 | u16 status; | |
413 | int pos; | |
414 | ||
415 | pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI); | |
416 | if (!pos) | |
417 | return 0; | |
418 | ||
419 | pci_read_config_word(pdev, pos + PCI_PRI_STATUS, &status); | |
420 | ||
421 | if (status & PCI_PRI_STATUS_PASID) | |
422 | return 1; | |
423 | ||
424 | return 0; | |
425 | } | |
426 | EXPORT_SYMBOL_GPL(pci_prg_resp_pasid_required); | |
427 | ||
086ac11f JR |
428 | #define PASID_NUMBER_SHIFT 8 |
429 | #define PASID_NUMBER_MASK (0x1f << PASID_NUMBER_SHIFT) | |
430 | /** | |
431 | * pci_max_pasid - Get maximum number of PASIDs supported by device | |
432 | * @pdev: PCI device structure | |
433 | * | |
434 | * Returns negative value when PASID capability is not present. | |
f6b6aefe | 435 | * Otherwise it returns the number of supported PASIDs. |
086ac11f JR |
436 | */ |
437 | int pci_max_pasids(struct pci_dev *pdev) | |
438 | { | |
439 | u16 supported; | |
440 | int pos; | |
441 | ||
69166fbf | 442 | pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PASID); |
086ac11f JR |
443 | if (!pos) |
444 | return -EINVAL; | |
445 | ||
91f57d5e | 446 | pci_read_config_word(pdev, pos + PCI_PASID_CAP, &supported); |
086ac11f JR |
447 | |
448 | supported = (supported & PASID_NUMBER_MASK) >> PASID_NUMBER_SHIFT; | |
449 | ||
450 | return (1 << supported); | |
451 | } | |
452 | EXPORT_SYMBOL_GPL(pci_max_pasids); | |
453 | #endif /* CONFIG_PCI_PASID */ |