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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 JR |
144 | |
145 | #ifdef CONFIG_PCI_PRI | |
146 | /** | |
147 | * pci_enable_pri - Enable PRI capability | |
148 | * @ pdev: PCI device structure | |
149 | * | |
150 | * Returns 0 on success, negative value on error | |
151 | */ | |
152 | int pci_enable_pri(struct pci_dev *pdev, u32 reqs) | |
153 | { | |
154 | u16 control, status; | |
155 | u32 max_requests; | |
156 | int pos; | |
157 | ||
a4f4fa68 JPB |
158 | if (WARN_ON(pdev->pri_enabled)) |
159 | return -EBUSY; | |
160 | ||
69166fbf | 161 | pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI); |
c320b976 JR |
162 | if (!pos) |
163 | return -EINVAL; | |
164 | ||
91f57d5e | 165 | pci_read_config_word(pdev, pos + PCI_PRI_STATUS, &status); |
4ebeb1ec | 166 | if (!(status & PCI_PRI_STATUS_STOPPED)) |
c320b976 JR |
167 | return -EBUSY; |
168 | ||
91f57d5e | 169 | pci_read_config_dword(pdev, pos + PCI_PRI_MAX_REQ, &max_requests); |
c320b976 | 170 | reqs = min(max_requests, reqs); |
4ebeb1ec | 171 | pdev->pri_reqs_alloc = reqs; |
91f57d5e | 172 | pci_write_config_dword(pdev, pos + PCI_PRI_ALLOC_REQ, reqs); |
c320b976 | 173 | |
4ebeb1ec | 174 | control = PCI_PRI_CTRL_ENABLE; |
91f57d5e | 175 | pci_write_config_word(pdev, pos + PCI_PRI_CTRL, control); |
c320b976 | 176 | |
a4f4fa68 JPB |
177 | pdev->pri_enabled = 1; |
178 | ||
c320b976 JR |
179 | return 0; |
180 | } | |
181 | EXPORT_SYMBOL_GPL(pci_enable_pri); | |
182 | ||
183 | /** | |
184 | * pci_disable_pri - Disable PRI capability | |
185 | * @pdev: PCI device structure | |
186 | * | |
187 | * Only clears the enabled-bit, regardless of its former value | |
188 | */ | |
189 | void pci_disable_pri(struct pci_dev *pdev) | |
190 | { | |
191 | u16 control; | |
192 | int pos; | |
193 | ||
a4f4fa68 JPB |
194 | if (WARN_ON(!pdev->pri_enabled)) |
195 | return; | |
196 | ||
69166fbf | 197 | pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI); |
c320b976 JR |
198 | if (!pos) |
199 | return; | |
200 | ||
91f57d5e AW |
201 | pci_read_config_word(pdev, pos + PCI_PRI_CTRL, &control); |
202 | control &= ~PCI_PRI_CTRL_ENABLE; | |
203 | pci_write_config_word(pdev, pos + PCI_PRI_CTRL, control); | |
a4f4fa68 JPB |
204 | |
205 | pdev->pri_enabled = 0; | |
c320b976 JR |
206 | } |
207 | EXPORT_SYMBOL_GPL(pci_disable_pri); | |
208 | ||
4ebeb1ec CT |
209 | /** |
210 | * pci_restore_pri_state - Restore PRI | |
211 | * @pdev: PCI device structure | |
212 | */ | |
213 | void pci_restore_pri_state(struct pci_dev *pdev) | |
214 | { | |
215 | u16 control = PCI_PRI_CTRL_ENABLE; | |
216 | u32 reqs = pdev->pri_reqs_alloc; | |
217 | int pos; | |
218 | ||
219 | if (!pdev->pri_enabled) | |
220 | return; | |
221 | ||
222 | pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI); | |
223 | if (!pos) | |
224 | return; | |
225 | ||
226 | pci_write_config_dword(pdev, pos + PCI_PRI_ALLOC_REQ, reqs); | |
227 | pci_write_config_word(pdev, pos + PCI_PRI_CTRL, control); | |
228 | } | |
229 | EXPORT_SYMBOL_GPL(pci_restore_pri_state); | |
230 | ||
c320b976 JR |
231 | /** |
232 | * pci_reset_pri - Resets device's PRI state | |
233 | * @pdev: PCI device structure | |
234 | * | |
235 | * The PRI capability must be disabled before this function is called. | |
236 | * Returns 0 on success, negative value on error. | |
237 | */ | |
238 | int pci_reset_pri(struct pci_dev *pdev) | |
239 | { | |
240 | u16 control; | |
241 | int pos; | |
242 | ||
a4f4fa68 JPB |
243 | if (WARN_ON(pdev->pri_enabled)) |
244 | return -EBUSY; | |
245 | ||
69166fbf | 246 | pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI); |
c320b976 JR |
247 | if (!pos) |
248 | return -EINVAL; | |
249 | ||
4ebeb1ec | 250 | control = PCI_PRI_CTRL_RESET; |
91f57d5e | 251 | pci_write_config_word(pdev, pos + PCI_PRI_CTRL, control); |
c320b976 JR |
252 | |
253 | return 0; | |
254 | } | |
255 | EXPORT_SYMBOL_GPL(pci_reset_pri); | |
c320b976 | 256 | #endif /* CONFIG_PCI_PRI */ |
086ac11f JR |
257 | |
258 | #ifdef CONFIG_PCI_PASID | |
259 | /** | |
260 | * pci_enable_pasid - Enable the PASID capability | |
261 | * @pdev: PCI device structure | |
262 | * @features: Features to enable | |
263 | * | |
264 | * Returns 0 on success, negative value on error. This function checks | |
265 | * whether the features are actually supported by the device and returns | |
266 | * an error if not. | |
267 | */ | |
268 | int pci_enable_pasid(struct pci_dev *pdev, int features) | |
269 | { | |
270 | u16 control, supported; | |
271 | int pos; | |
272 | ||
a4f4fa68 JPB |
273 | if (WARN_ON(pdev->pasid_enabled)) |
274 | return -EBUSY; | |
275 | ||
7ce3f912 SK |
276 | if (!pdev->eetlp_prefix_path) |
277 | return -EINVAL; | |
278 | ||
69166fbf | 279 | pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PASID); |
086ac11f JR |
280 | if (!pos) |
281 | return -EINVAL; | |
282 | ||
91f57d5e | 283 | pci_read_config_word(pdev, pos + PCI_PASID_CAP, &supported); |
91f57d5e | 284 | supported &= PCI_PASID_CAP_EXEC | PCI_PASID_CAP_PRIV; |
086ac11f JR |
285 | |
286 | /* User wants to enable anything unsupported? */ | |
287 | if ((supported & features) != features) | |
288 | return -EINVAL; | |
289 | ||
91f57d5e | 290 | control = PCI_PASID_CTRL_ENABLE | features; |
4ebeb1ec | 291 | pdev->pasid_features = features; |
086ac11f | 292 | |
91f57d5e | 293 | pci_write_config_word(pdev, pos + PCI_PASID_CTRL, control); |
086ac11f | 294 | |
a4f4fa68 JPB |
295 | pdev->pasid_enabled = 1; |
296 | ||
086ac11f JR |
297 | return 0; |
298 | } | |
299 | EXPORT_SYMBOL_GPL(pci_enable_pasid); | |
300 | ||
301 | /** | |
302 | * pci_disable_pasid - Disable the PASID capability | |
303 | * @pdev: PCI device structure | |
086ac11f JR |
304 | */ |
305 | void pci_disable_pasid(struct pci_dev *pdev) | |
306 | { | |
307 | u16 control = 0; | |
308 | int pos; | |
309 | ||
a4f4fa68 JPB |
310 | if (WARN_ON(!pdev->pasid_enabled)) |
311 | return; | |
312 | ||
69166fbf | 313 | pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PASID); |
086ac11f JR |
314 | if (!pos) |
315 | return; | |
316 | ||
91f57d5e | 317 | pci_write_config_word(pdev, pos + PCI_PASID_CTRL, control); |
a4f4fa68 JPB |
318 | |
319 | pdev->pasid_enabled = 0; | |
086ac11f JR |
320 | } |
321 | EXPORT_SYMBOL_GPL(pci_disable_pasid); | |
322 | ||
4ebeb1ec CT |
323 | /** |
324 | * pci_restore_pasid_state - Restore PASID capabilities | |
325 | * @pdev: PCI device structure | |
326 | */ | |
327 | void pci_restore_pasid_state(struct pci_dev *pdev) | |
328 | { | |
329 | u16 control; | |
330 | int pos; | |
331 | ||
332 | if (!pdev->pasid_enabled) | |
333 | return; | |
334 | ||
335 | pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PASID); | |
336 | if (!pos) | |
337 | return; | |
338 | ||
339 | control = PCI_PASID_CTRL_ENABLE | pdev->pasid_features; | |
340 | pci_write_config_word(pdev, pos + PCI_PASID_CTRL, control); | |
341 | } | |
342 | EXPORT_SYMBOL_GPL(pci_restore_pasid_state); | |
343 | ||
086ac11f JR |
344 | /** |
345 | * pci_pasid_features - Check which PASID features are supported | |
346 | * @pdev: PCI device structure | |
347 | * | |
348 | * Returns a negative value when no PASI capability is present. | |
349 | * Otherwise is returns a bitmask with supported features. Current | |
350 | * features reported are: | |
91f57d5e | 351 | * PCI_PASID_CAP_EXEC - Execute permission supported |
f7625980 | 352 | * PCI_PASID_CAP_PRIV - Privileged mode supported |
086ac11f JR |
353 | */ |
354 | int pci_pasid_features(struct pci_dev *pdev) | |
355 | { | |
356 | u16 supported; | |
357 | int pos; | |
358 | ||
69166fbf | 359 | pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PASID); |
086ac11f JR |
360 | if (!pos) |
361 | return -EINVAL; | |
362 | ||
91f57d5e | 363 | pci_read_config_word(pdev, pos + PCI_PASID_CAP, &supported); |
086ac11f | 364 | |
91f57d5e | 365 | supported &= PCI_PASID_CAP_EXEC | PCI_PASID_CAP_PRIV; |
086ac11f JR |
366 | |
367 | return supported; | |
368 | } | |
369 | EXPORT_SYMBOL_GPL(pci_pasid_features); | |
370 | ||
371 | #define PASID_NUMBER_SHIFT 8 | |
372 | #define PASID_NUMBER_MASK (0x1f << PASID_NUMBER_SHIFT) | |
373 | /** | |
374 | * pci_max_pasid - Get maximum number of PASIDs supported by device | |
375 | * @pdev: PCI device structure | |
376 | * | |
377 | * Returns negative value when PASID capability is not present. | |
378 | * Otherwise it returns the numer of supported PASIDs. | |
379 | */ | |
380 | int pci_max_pasids(struct pci_dev *pdev) | |
381 | { | |
382 | u16 supported; | |
383 | int pos; | |
384 | ||
69166fbf | 385 | pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PASID); |
086ac11f JR |
386 | if (!pos) |
387 | return -EINVAL; | |
388 | ||
91f57d5e | 389 | pci_read_config_word(pdev, pos + PCI_PASID_CAP, &supported); |
086ac11f JR |
390 | |
391 | supported = (supported & PASID_NUMBER_MASK) >> PASID_NUMBER_SHIFT; | |
392 | ||
393 | return (1 << supported); | |
394 | } | |
395 | EXPORT_SYMBOL_GPL(pci_max_pasids); | |
396 | #endif /* CONFIG_PCI_PASID */ |