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45051539 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
fc2100eb JR |
2 | /* |
3 | * Copyright (C) 2007-2008 Advanced Micro Devices, Inc. | |
63ce3ae8 | 4 | * Author: Joerg Roedel <jroedel@suse.de> |
fc2100eb JR |
5 | */ |
6 | ||
92e7066f | 7 | #define pr_fmt(fmt) "iommu: " fmt |
7d3002cc | 8 | |
905d66c1 | 9 | #include <linux/device.h> |
40998188 | 10 | #include <linux/kernel.h> |
fc2100eb JR |
11 | #include <linux/bug.h> |
12 | #include <linux/types.h> | |
c1af7b40 PG |
13 | #include <linux/init.h> |
14 | #include <linux/export.h> | |
60db4027 | 15 | #include <linux/slab.h> |
fc2100eb JR |
16 | #include <linux/errno.h> |
17 | #include <linux/iommu.h> | |
d72e31c9 AW |
18 | #include <linux/idr.h> |
19 | #include <linux/notifier.h> | |
20 | #include <linux/err.h> | |
104a1c13 | 21 | #include <linux/pci.h> |
f096c061 | 22 | #include <linux/bitops.h> |
57f98d2f | 23 | #include <linux/property.h> |
eab03e2a | 24 | #include <linux/fsl/mc.h> |
25f003de | 25 | #include <linux/module.h> |
7f6db171 | 26 | #include <trace/events/iommu.h> |
d72e31c9 AW |
27 | |
28 | static struct kset *iommu_group_kset; | |
e38d1f13 | 29 | static DEFINE_IDA(iommu_group_ida); |
22bb182c JR |
30 | |
31 | static unsigned int iommu_def_domain_type __read_mostly; | |
68a6efe8 | 32 | static bool iommu_dma_strict __read_mostly = true; |
faf14989 | 33 | static u32 iommu_cmd_line __read_mostly; |
d72e31c9 AW |
34 | |
35 | struct iommu_group { | |
36 | struct kobject kobj; | |
37 | struct kobject *devices_kobj; | |
38 | struct list_head devices; | |
39 | struct mutex mutex; | |
40 | struct blocking_notifier_head notifier; | |
41 | void *iommu_data; | |
42 | void (*iommu_data_release)(void *iommu_data); | |
43 | char *name; | |
44 | int id; | |
53723dc5 | 45 | struct iommu_domain *default_domain; |
e39cb8a3 | 46 | struct iommu_domain *domain; |
d72e31c9 AW |
47 | }; |
48 | ||
c09e22d5 | 49 | struct group_device { |
d72e31c9 AW |
50 | struct list_head list; |
51 | struct device *dev; | |
52 | char *name; | |
53 | }; | |
54 | ||
55 | struct iommu_group_attribute { | |
56 | struct attribute attr; | |
57 | ssize_t (*show)(struct iommu_group *group, char *buf); | |
58 | ssize_t (*store)(struct iommu_group *group, | |
59 | const char *buf, size_t count); | |
60 | }; | |
61 | ||
bc7d12b9 | 62 | static const char * const iommu_group_resv_type_string[] = { |
adfd3738 EA |
63 | [IOMMU_RESV_DIRECT] = "direct", |
64 | [IOMMU_RESV_DIRECT_RELAXABLE] = "direct-relaxable", | |
65 | [IOMMU_RESV_RESERVED] = "reserved", | |
66 | [IOMMU_RESV_MSI] = "msi", | |
67 | [IOMMU_RESV_SW_MSI] = "msi", | |
bc7d12b9 EA |
68 | }; |
69 | ||
faf14989 JR |
70 | #define IOMMU_CMD_LINE_DMA_API BIT(0) |
71 | ||
72 | static void iommu_set_cmd_line_dma_api(void) | |
73 | { | |
74 | iommu_cmd_line |= IOMMU_CMD_LINE_DMA_API; | |
75 | } | |
76 | ||
22bb182c | 77 | static bool iommu_cmd_line_dma_api(void) |
faf14989 JR |
78 | { |
79 | return !!(iommu_cmd_line & IOMMU_CMD_LINE_DMA_API); | |
80 | } | |
81 | ||
d72e31c9 AW |
82 | #define IOMMU_GROUP_ATTR(_name, _mode, _show, _store) \ |
83 | struct iommu_group_attribute iommu_group_attr_##_name = \ | |
84 | __ATTR(_name, _mode, _show, _store) | |
fc2100eb | 85 | |
d72e31c9 AW |
86 | #define to_iommu_group_attr(_attr) \ |
87 | container_of(_attr, struct iommu_group_attribute, attr) | |
88 | #define to_iommu_group(_kobj) \ | |
89 | container_of(_kobj, struct iommu_group, kobj) | |
fc2100eb | 90 | |
b0119e87 JR |
91 | static LIST_HEAD(iommu_device_list); |
92 | static DEFINE_SPINLOCK(iommu_device_lock); | |
93 | ||
5fa9e7c5 JR |
94 | /* |
95 | * Use a function instead of an array here because the domain-type is a | |
96 | * bit-field, so an array would waste memory. | |
97 | */ | |
98 | static const char *iommu_domain_type_str(unsigned int t) | |
99 | { | |
100 | switch (t) { | |
101 | case IOMMU_DOMAIN_BLOCKED: | |
102 | return "Blocked"; | |
103 | case IOMMU_DOMAIN_IDENTITY: | |
104 | return "Passthrough"; | |
105 | case IOMMU_DOMAIN_UNMANAGED: | |
106 | return "Unmanaged"; | |
107 | case IOMMU_DOMAIN_DMA: | |
108 | return "Translated"; | |
109 | default: | |
110 | return "Unknown"; | |
111 | } | |
112 | } | |
113 | ||
114 | static int __init iommu_subsys_init(void) | |
115 | { | |
22bb182c JR |
116 | bool cmd_line = iommu_cmd_line_dma_api(); |
117 | ||
118 | if (!cmd_line) { | |
119 | if (IS_ENABLED(CONFIG_IOMMU_DEFAULT_PASSTHROUGH)) | |
120 | iommu_set_default_passthrough(false); | |
121 | else | |
122 | iommu_set_default_translated(false); | |
2cc13bb4 | 123 | |
2896ba40 JR |
124 | if (iommu_default_passthrough() && mem_encrypt_active()) { |
125 | pr_info("Memory encryption detected - Disabling default IOMMU Passthrough\n"); | |
2cc13bb4 JR |
126 | iommu_set_default_translated(false); |
127 | } | |
22bb182c JR |
128 | } |
129 | ||
130 | pr_info("Default domain type: %s %s\n", | |
131 | iommu_domain_type_str(iommu_def_domain_type), | |
132 | cmd_line ? "(set via kernel command line)" : ""); | |
5fa9e7c5 JR |
133 | |
134 | return 0; | |
135 | } | |
136 | subsys_initcall(iommu_subsys_init); | |
137 | ||
b0119e87 JR |
138 | int iommu_device_register(struct iommu_device *iommu) |
139 | { | |
140 | spin_lock(&iommu_device_lock); | |
141 | list_add_tail(&iommu->list, &iommu_device_list); | |
142 | spin_unlock(&iommu_device_lock); | |
b0119e87 JR |
143 | return 0; |
144 | } | |
a7ba5c3d | 145 | EXPORT_SYMBOL_GPL(iommu_device_register); |
b0119e87 JR |
146 | |
147 | void iommu_device_unregister(struct iommu_device *iommu) | |
148 | { | |
149 | spin_lock(&iommu_device_lock); | |
150 | list_del(&iommu->list); | |
151 | spin_unlock(&iommu_device_lock); | |
152 | } | |
a7ba5c3d | 153 | EXPORT_SYMBOL_GPL(iommu_device_unregister); |
b0119e87 | 154 | |
0c830e6b JP |
155 | static struct iommu_param *iommu_get_dev_param(struct device *dev) |
156 | { | |
157 | struct iommu_param *param = dev->iommu_param; | |
158 | ||
159 | if (param) | |
160 | return param; | |
161 | ||
162 | param = kzalloc(sizeof(*param), GFP_KERNEL); | |
163 | if (!param) | |
164 | return NULL; | |
165 | ||
166 | mutex_init(¶m->lock); | |
167 | dev->iommu_param = param; | |
168 | return param; | |
169 | } | |
170 | ||
171 | static void iommu_free_dev_param(struct device *dev) | |
172 | { | |
173 | kfree(dev->iommu_param); | |
174 | dev->iommu_param = NULL; | |
175 | } | |
176 | ||
cc5aed44 JR |
177 | int iommu_probe_device(struct device *dev) |
178 | { | |
179 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
0c830e6b | 180 | int ret; |
cc5aed44 JR |
181 | |
182 | WARN_ON(dev->iommu_group); | |
0c830e6b JP |
183 | if (!ops) |
184 | return -EINVAL; | |
cc5aed44 | 185 | |
0c830e6b JP |
186 | if (!iommu_get_dev_param(dev)) |
187 | return -ENOMEM; | |
cc5aed44 | 188 | |
25f003de WD |
189 | if (!try_module_get(ops->owner)) { |
190 | ret = -EINVAL; | |
191 | goto err_free_dev_param; | |
192 | } | |
193 | ||
0c830e6b JP |
194 | ret = ops->add_device(dev); |
195 | if (ret) | |
25f003de WD |
196 | goto err_module_put; |
197 | ||
198 | return 0; | |
dc9de8a2 | 199 | |
25f003de WD |
200 | err_module_put: |
201 | module_put(ops->owner); | |
202 | err_free_dev_param: | |
203 | iommu_free_dev_param(dev); | |
dc9de8a2 | 204 | return ret; |
cc5aed44 JR |
205 | } |
206 | ||
207 | void iommu_release_device(struct device *dev) | |
208 | { | |
209 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
210 | ||
211 | if (dev->iommu_group) | |
212 | ops->remove_device(dev); | |
0c830e6b | 213 | |
25f003de WD |
214 | if (dev->iommu_param) { |
215 | module_put(ops->owner); | |
216 | iommu_free_dev_param(dev); | |
217 | } | |
cc5aed44 JR |
218 | } |
219 | ||
53723dc5 JR |
220 | static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus, |
221 | unsigned type); | |
e39cb8a3 JR |
222 | static int __iommu_attach_device(struct iommu_domain *domain, |
223 | struct device *dev); | |
224 | static int __iommu_attach_group(struct iommu_domain *domain, | |
225 | struct iommu_group *group); | |
226 | static void __iommu_detach_group(struct iommu_domain *domain, | |
227 | struct iommu_group *group); | |
53723dc5 | 228 | |
fccb4e3b WD |
229 | static int __init iommu_set_def_domain_type(char *str) |
230 | { | |
231 | bool pt; | |
7f9584df | 232 | int ret; |
fccb4e3b | 233 | |
7f9584df AS |
234 | ret = kstrtobool(str, &pt); |
235 | if (ret) | |
236 | return ret; | |
fccb4e3b | 237 | |
adab0b07 JR |
238 | if (pt) |
239 | iommu_set_default_passthrough(true); | |
240 | else | |
241 | iommu_set_default_translated(true); | |
faf14989 | 242 | |
fccb4e3b WD |
243 | return 0; |
244 | } | |
245 | early_param("iommu.passthrough", iommu_set_def_domain_type); | |
246 | ||
68a6efe8 ZL |
247 | static int __init iommu_dma_setup(char *str) |
248 | { | |
249 | return kstrtobool(str, &iommu_dma_strict); | |
250 | } | |
251 | early_param("iommu.strict", iommu_dma_setup); | |
252 | ||
d72e31c9 AW |
253 | static ssize_t iommu_group_attr_show(struct kobject *kobj, |
254 | struct attribute *__attr, char *buf) | |
1460432c | 255 | { |
d72e31c9 AW |
256 | struct iommu_group_attribute *attr = to_iommu_group_attr(__attr); |
257 | struct iommu_group *group = to_iommu_group(kobj); | |
258 | ssize_t ret = -EIO; | |
1460432c | 259 | |
d72e31c9 AW |
260 | if (attr->show) |
261 | ret = attr->show(group, buf); | |
262 | return ret; | |
263 | } | |
264 | ||
265 | static ssize_t iommu_group_attr_store(struct kobject *kobj, | |
266 | struct attribute *__attr, | |
267 | const char *buf, size_t count) | |
268 | { | |
269 | struct iommu_group_attribute *attr = to_iommu_group_attr(__attr); | |
270 | struct iommu_group *group = to_iommu_group(kobj); | |
271 | ssize_t ret = -EIO; | |
1460432c | 272 | |
d72e31c9 AW |
273 | if (attr->store) |
274 | ret = attr->store(group, buf, count); | |
275 | return ret; | |
1460432c | 276 | } |
1460432c | 277 | |
d72e31c9 AW |
278 | static const struct sysfs_ops iommu_group_sysfs_ops = { |
279 | .show = iommu_group_attr_show, | |
280 | .store = iommu_group_attr_store, | |
281 | }; | |
1460432c | 282 | |
d72e31c9 AW |
283 | static int iommu_group_create_file(struct iommu_group *group, |
284 | struct iommu_group_attribute *attr) | |
285 | { | |
286 | return sysfs_create_file(&group->kobj, &attr->attr); | |
1460432c | 287 | } |
1460432c | 288 | |
d72e31c9 AW |
289 | static void iommu_group_remove_file(struct iommu_group *group, |
290 | struct iommu_group_attribute *attr) | |
291 | { | |
292 | sysfs_remove_file(&group->kobj, &attr->attr); | |
293 | } | |
294 | ||
295 | static ssize_t iommu_group_show_name(struct iommu_group *group, char *buf) | |
296 | { | |
297 | return sprintf(buf, "%s\n", group->name); | |
298 | } | |
299 | ||
6c65fb31 EA |
300 | /** |
301 | * iommu_insert_resv_region - Insert a new region in the | |
302 | * list of reserved regions. | |
303 | * @new: new region to insert | |
304 | * @regions: list of regions | |
305 | * | |
4dbd258f EA |
306 | * Elements are sorted by start address and overlapping segments |
307 | * of the same type are merged. | |
6c65fb31 | 308 | */ |
4dbd258f EA |
309 | int iommu_insert_resv_region(struct iommu_resv_region *new, |
310 | struct list_head *regions) | |
6c65fb31 | 311 | { |
4dbd258f EA |
312 | struct iommu_resv_region *iter, *tmp, *nr, *top; |
313 | LIST_HEAD(stack); | |
314 | ||
315 | nr = iommu_alloc_resv_region(new->start, new->length, | |
316 | new->prot, new->type); | |
317 | if (!nr) | |
318 | return -ENOMEM; | |
319 | ||
320 | /* First add the new element based on start address sorting */ | |
321 | list_for_each_entry(iter, regions, list) { | |
322 | if (nr->start < iter->start || | |
323 | (nr->start == iter->start && nr->type <= iter->type)) | |
324 | break; | |
325 | } | |
326 | list_add_tail(&nr->list, &iter->list); | |
327 | ||
328 | /* Merge overlapping segments of type nr->type in @regions, if any */ | |
329 | list_for_each_entry_safe(iter, tmp, regions, list) { | |
330 | phys_addr_t top_end, iter_end = iter->start + iter->length - 1; | |
331 | ||
4c80ba39 EA |
332 | /* no merge needed on elements of different types than @new */ |
333 | if (iter->type != new->type) { | |
4dbd258f EA |
334 | list_move_tail(&iter->list, &stack); |
335 | continue; | |
336 | } | |
337 | ||
338 | /* look for the last stack element of same type as @iter */ | |
339 | list_for_each_entry_reverse(top, &stack, list) | |
340 | if (top->type == iter->type) | |
341 | goto check_overlap; | |
342 | ||
343 | list_move_tail(&iter->list, &stack); | |
344 | continue; | |
345 | ||
346 | check_overlap: | |
347 | top_end = top->start + top->length - 1; | |
348 | ||
349 | if (iter->start > top_end + 1) { | |
350 | list_move_tail(&iter->list, &stack); | |
6c65fb31 | 351 | } else { |
4dbd258f EA |
352 | top->length = max(top_end, iter_end) - top->start + 1; |
353 | list_del(&iter->list); | |
354 | kfree(iter); | |
6c65fb31 EA |
355 | } |
356 | } | |
4dbd258f | 357 | list_splice(&stack, regions); |
6c65fb31 EA |
358 | return 0; |
359 | } | |
360 | ||
361 | static int | |
362 | iommu_insert_device_resv_regions(struct list_head *dev_resv_regions, | |
363 | struct list_head *group_resv_regions) | |
364 | { | |
365 | struct iommu_resv_region *entry; | |
a514a6e2 | 366 | int ret = 0; |
6c65fb31 EA |
367 | |
368 | list_for_each_entry(entry, dev_resv_regions, list) { | |
369 | ret = iommu_insert_resv_region(entry, group_resv_regions); | |
370 | if (ret) | |
371 | break; | |
372 | } | |
373 | return ret; | |
374 | } | |
375 | ||
376 | int iommu_get_group_resv_regions(struct iommu_group *group, | |
377 | struct list_head *head) | |
378 | { | |
8d2932dd | 379 | struct group_device *device; |
6c65fb31 EA |
380 | int ret = 0; |
381 | ||
382 | mutex_lock(&group->mutex); | |
383 | list_for_each_entry(device, &group->devices, list) { | |
384 | struct list_head dev_resv_regions; | |
385 | ||
386 | INIT_LIST_HEAD(&dev_resv_regions); | |
387 | iommu_get_resv_regions(device->dev, &dev_resv_regions); | |
388 | ret = iommu_insert_device_resv_regions(&dev_resv_regions, head); | |
389 | iommu_put_resv_regions(device->dev, &dev_resv_regions); | |
390 | if (ret) | |
391 | break; | |
392 | } | |
393 | mutex_unlock(&group->mutex); | |
394 | return ret; | |
395 | } | |
396 | EXPORT_SYMBOL_GPL(iommu_get_group_resv_regions); | |
397 | ||
bc7d12b9 EA |
398 | static ssize_t iommu_group_show_resv_regions(struct iommu_group *group, |
399 | char *buf) | |
400 | { | |
401 | struct iommu_resv_region *region, *next; | |
402 | struct list_head group_resv_regions; | |
403 | char *str = buf; | |
404 | ||
405 | INIT_LIST_HEAD(&group_resv_regions); | |
406 | iommu_get_group_resv_regions(group, &group_resv_regions); | |
407 | ||
408 | list_for_each_entry_safe(region, next, &group_resv_regions, list) { | |
409 | str += sprintf(str, "0x%016llx 0x%016llx %s\n", | |
410 | (long long int)region->start, | |
411 | (long long int)(region->start + | |
412 | region->length - 1), | |
413 | iommu_group_resv_type_string[region->type]); | |
414 | kfree(region); | |
415 | } | |
416 | ||
417 | return (str - buf); | |
418 | } | |
419 | ||
c52c72d3 OJ |
420 | static ssize_t iommu_group_show_type(struct iommu_group *group, |
421 | char *buf) | |
422 | { | |
423 | char *type = "unknown\n"; | |
424 | ||
425 | if (group->default_domain) { | |
426 | switch (group->default_domain->type) { | |
427 | case IOMMU_DOMAIN_BLOCKED: | |
428 | type = "blocked\n"; | |
429 | break; | |
430 | case IOMMU_DOMAIN_IDENTITY: | |
431 | type = "identity\n"; | |
432 | break; | |
433 | case IOMMU_DOMAIN_UNMANAGED: | |
434 | type = "unmanaged\n"; | |
435 | break; | |
436 | case IOMMU_DOMAIN_DMA: | |
24f307d8 | 437 | type = "DMA\n"; |
c52c72d3 OJ |
438 | break; |
439 | } | |
440 | } | |
441 | strcpy(buf, type); | |
442 | ||
443 | return strlen(type); | |
444 | } | |
445 | ||
d72e31c9 AW |
446 | static IOMMU_GROUP_ATTR(name, S_IRUGO, iommu_group_show_name, NULL); |
447 | ||
bc7d12b9 EA |
448 | static IOMMU_GROUP_ATTR(reserved_regions, 0444, |
449 | iommu_group_show_resv_regions, NULL); | |
450 | ||
c52c72d3 OJ |
451 | static IOMMU_GROUP_ATTR(type, 0444, iommu_group_show_type, NULL); |
452 | ||
d72e31c9 AW |
453 | static void iommu_group_release(struct kobject *kobj) |
454 | { | |
455 | struct iommu_group *group = to_iommu_group(kobj); | |
456 | ||
269aa808 JR |
457 | pr_debug("Releasing group %d\n", group->id); |
458 | ||
d72e31c9 AW |
459 | if (group->iommu_data_release) |
460 | group->iommu_data_release(group->iommu_data); | |
461 | ||
feccf398 | 462 | ida_simple_remove(&iommu_group_ida, group->id); |
d72e31c9 | 463 | |
53723dc5 JR |
464 | if (group->default_domain) |
465 | iommu_domain_free(group->default_domain); | |
466 | ||
d72e31c9 AW |
467 | kfree(group->name); |
468 | kfree(group); | |
469 | } | |
470 | ||
471 | static struct kobj_type iommu_group_ktype = { | |
472 | .sysfs_ops = &iommu_group_sysfs_ops, | |
473 | .release = iommu_group_release, | |
474 | }; | |
475 | ||
476 | /** | |
477 | * iommu_group_alloc - Allocate a new group | |
d72e31c9 AW |
478 | * |
479 | * This function is called by an iommu driver to allocate a new iommu | |
480 | * group. The iommu group represents the minimum granularity of the iommu. | |
481 | * Upon successful return, the caller holds a reference to the supplied | |
482 | * group in order to hold the group until devices are added. Use | |
483 | * iommu_group_put() to release this extra reference count, allowing the | |
484 | * group to be automatically reclaimed once it has no devices or external | |
485 | * references. | |
486 | */ | |
487 | struct iommu_group *iommu_group_alloc(void) | |
1460432c | 488 | { |
d72e31c9 AW |
489 | struct iommu_group *group; |
490 | int ret; | |
491 | ||
492 | group = kzalloc(sizeof(*group), GFP_KERNEL); | |
493 | if (!group) | |
494 | return ERR_PTR(-ENOMEM); | |
495 | ||
496 | group->kobj.kset = iommu_group_kset; | |
497 | mutex_init(&group->mutex); | |
498 | INIT_LIST_HEAD(&group->devices); | |
499 | BLOCKING_INIT_NOTIFIER_HEAD(&group->notifier); | |
500 | ||
feccf398 HK |
501 | ret = ida_simple_get(&iommu_group_ida, 0, 0, GFP_KERNEL); |
502 | if (ret < 0) { | |
d72e31c9 | 503 | kfree(group); |
feccf398 | 504 | return ERR_PTR(ret); |
d72e31c9 | 505 | } |
feccf398 | 506 | group->id = ret; |
1460432c | 507 | |
d72e31c9 AW |
508 | ret = kobject_init_and_add(&group->kobj, &iommu_group_ktype, |
509 | NULL, "%d", group->id); | |
510 | if (ret) { | |
feccf398 | 511 | ida_simple_remove(&iommu_group_ida, group->id); |
d72e31c9 AW |
512 | kfree(group); |
513 | return ERR_PTR(ret); | |
514 | } | |
515 | ||
516 | group->devices_kobj = kobject_create_and_add("devices", &group->kobj); | |
517 | if (!group->devices_kobj) { | |
518 | kobject_put(&group->kobj); /* triggers .release & free */ | |
519 | return ERR_PTR(-ENOMEM); | |
520 | } | |
521 | ||
522 | /* | |
523 | * The devices_kobj holds a reference on the group kobject, so | |
524 | * as long as that exists so will the group. We can therefore | |
525 | * use the devices_kobj for reference counting. | |
526 | */ | |
527 | kobject_put(&group->kobj); | |
528 | ||
bc7d12b9 EA |
529 | ret = iommu_group_create_file(group, |
530 | &iommu_group_attr_reserved_regions); | |
531 | if (ret) | |
532 | return ERR_PTR(ret); | |
533 | ||
c52c72d3 OJ |
534 | ret = iommu_group_create_file(group, &iommu_group_attr_type); |
535 | if (ret) | |
536 | return ERR_PTR(ret); | |
537 | ||
269aa808 JR |
538 | pr_debug("Allocated group %d\n", group->id); |
539 | ||
d72e31c9 AW |
540 | return group; |
541 | } | |
542 | EXPORT_SYMBOL_GPL(iommu_group_alloc); | |
543 | ||
aa16bea9 AK |
544 | struct iommu_group *iommu_group_get_by_id(int id) |
545 | { | |
546 | struct kobject *group_kobj; | |
547 | struct iommu_group *group; | |
548 | const char *name; | |
549 | ||
550 | if (!iommu_group_kset) | |
551 | return NULL; | |
552 | ||
553 | name = kasprintf(GFP_KERNEL, "%d", id); | |
554 | if (!name) | |
555 | return NULL; | |
556 | ||
557 | group_kobj = kset_find_obj(iommu_group_kset, name); | |
558 | kfree(name); | |
559 | ||
560 | if (!group_kobj) | |
561 | return NULL; | |
562 | ||
563 | group = container_of(group_kobj, struct iommu_group, kobj); | |
564 | BUG_ON(group->id != id); | |
565 | ||
566 | kobject_get(group->devices_kobj); | |
567 | kobject_put(&group->kobj); | |
568 | ||
569 | return group; | |
570 | } | |
571 | EXPORT_SYMBOL_GPL(iommu_group_get_by_id); | |
572 | ||
d72e31c9 AW |
573 | /** |
574 | * iommu_group_get_iommudata - retrieve iommu_data registered for a group | |
575 | * @group: the group | |
576 | * | |
577 | * iommu drivers can store data in the group for use when doing iommu | |
578 | * operations. This function provides a way to retrieve it. Caller | |
579 | * should hold a group reference. | |
580 | */ | |
581 | void *iommu_group_get_iommudata(struct iommu_group *group) | |
582 | { | |
583 | return group->iommu_data; | |
584 | } | |
585 | EXPORT_SYMBOL_GPL(iommu_group_get_iommudata); | |
586 | ||
587 | /** | |
588 | * iommu_group_set_iommudata - set iommu_data for a group | |
589 | * @group: the group | |
590 | * @iommu_data: new data | |
591 | * @release: release function for iommu_data | |
592 | * | |
593 | * iommu drivers can store data in the group for use when doing iommu | |
594 | * operations. This function provides a way to set the data after | |
595 | * the group has been allocated. Caller should hold a group reference. | |
596 | */ | |
597 | void iommu_group_set_iommudata(struct iommu_group *group, void *iommu_data, | |
598 | void (*release)(void *iommu_data)) | |
1460432c | 599 | { |
d72e31c9 AW |
600 | group->iommu_data = iommu_data; |
601 | group->iommu_data_release = release; | |
602 | } | |
603 | EXPORT_SYMBOL_GPL(iommu_group_set_iommudata); | |
1460432c | 604 | |
d72e31c9 AW |
605 | /** |
606 | * iommu_group_set_name - set name for a group | |
607 | * @group: the group | |
608 | * @name: name | |
609 | * | |
610 | * Allow iommu driver to set a name for a group. When set it will | |
611 | * appear in a name attribute file under the group in sysfs. | |
612 | */ | |
613 | int iommu_group_set_name(struct iommu_group *group, const char *name) | |
614 | { | |
615 | int ret; | |
616 | ||
617 | if (group->name) { | |
618 | iommu_group_remove_file(group, &iommu_group_attr_name); | |
619 | kfree(group->name); | |
620 | group->name = NULL; | |
621 | if (!name) | |
622 | return 0; | |
623 | } | |
624 | ||
625 | group->name = kstrdup(name, GFP_KERNEL); | |
626 | if (!group->name) | |
627 | return -ENOMEM; | |
628 | ||
629 | ret = iommu_group_create_file(group, &iommu_group_attr_name); | |
630 | if (ret) { | |
631 | kfree(group->name); | |
632 | group->name = NULL; | |
633 | return ret; | |
634 | } | |
1460432c AW |
635 | |
636 | return 0; | |
637 | } | |
d72e31c9 | 638 | EXPORT_SYMBOL_GPL(iommu_group_set_name); |
1460432c | 639 | |
beed2821 JR |
640 | static int iommu_group_create_direct_mappings(struct iommu_group *group, |
641 | struct device *dev) | |
642 | { | |
643 | struct iommu_domain *domain = group->default_domain; | |
e5b5234a | 644 | struct iommu_resv_region *entry; |
beed2821 JR |
645 | struct list_head mappings; |
646 | unsigned long pg_size; | |
647 | int ret = 0; | |
648 | ||
649 | if (!domain || domain->type != IOMMU_DOMAIN_DMA) | |
650 | return 0; | |
651 | ||
d16e0faa | 652 | BUG_ON(!domain->pgsize_bitmap); |
beed2821 | 653 | |
d16e0faa | 654 | pg_size = 1UL << __ffs(domain->pgsize_bitmap); |
beed2821 JR |
655 | INIT_LIST_HEAD(&mappings); |
656 | ||
e5b5234a | 657 | iommu_get_resv_regions(dev, &mappings); |
beed2821 JR |
658 | |
659 | /* We need to consider overlapping regions for different devices */ | |
660 | list_for_each_entry(entry, &mappings, list) { | |
661 | dma_addr_t start, end, addr; | |
662 | ||
e5b5234a EA |
663 | if (domain->ops->apply_resv_region) |
664 | domain->ops->apply_resv_region(dev, domain, entry); | |
33b21a6b | 665 | |
beed2821 JR |
666 | start = ALIGN(entry->start, pg_size); |
667 | end = ALIGN(entry->start + entry->length, pg_size); | |
668 | ||
adfd3738 EA |
669 | if (entry->type != IOMMU_RESV_DIRECT && |
670 | entry->type != IOMMU_RESV_DIRECT_RELAXABLE) | |
544a25d9 EA |
671 | continue; |
672 | ||
beed2821 JR |
673 | for (addr = start; addr < end; addr += pg_size) { |
674 | phys_addr_t phys_addr; | |
675 | ||
676 | phys_addr = iommu_iova_to_phys(domain, addr); | |
677 | if (phys_addr) | |
678 | continue; | |
679 | ||
680 | ret = iommu_map(domain, addr, addr, pg_size, entry->prot); | |
681 | if (ret) | |
682 | goto out; | |
683 | } | |
684 | ||
685 | } | |
686 | ||
add02cfd JR |
687 | iommu_flush_tlb_all(domain); |
688 | ||
beed2821 | 689 | out: |
e5b5234a | 690 | iommu_put_resv_regions(dev, &mappings); |
beed2821 JR |
691 | |
692 | return ret; | |
693 | } | |
694 | ||
d72e31c9 AW |
695 | /** |
696 | * iommu_group_add_device - add a device to an iommu group | |
697 | * @group: the group into which to add the device (reference should be held) | |
698 | * @dev: the device | |
699 | * | |
700 | * This function is called by an iommu driver to add a device into a | |
701 | * group. Adding a device increments the group reference count. | |
702 | */ | |
703 | int iommu_group_add_device(struct iommu_group *group, struct device *dev) | |
1460432c | 704 | { |
d72e31c9 | 705 | int ret, i = 0; |
c09e22d5 | 706 | struct group_device *device; |
d72e31c9 AW |
707 | |
708 | device = kzalloc(sizeof(*device), GFP_KERNEL); | |
709 | if (!device) | |
710 | return -ENOMEM; | |
711 | ||
712 | device->dev = dev; | |
1460432c | 713 | |
d72e31c9 | 714 | ret = sysfs_create_link(&dev->kobj, &group->kobj, "iommu_group"); |
797a8b4d RM |
715 | if (ret) |
716 | goto err_free_device; | |
d72e31c9 AW |
717 | |
718 | device->name = kasprintf(GFP_KERNEL, "%s", kobject_name(&dev->kobj)); | |
719 | rename: | |
720 | if (!device->name) { | |
797a8b4d RM |
721 | ret = -ENOMEM; |
722 | goto err_remove_link; | |
d72e31c9 | 723 | } |
1460432c | 724 | |
d72e31c9 AW |
725 | ret = sysfs_create_link_nowarn(group->devices_kobj, |
726 | &dev->kobj, device->name); | |
727 | if (ret) { | |
d72e31c9 AW |
728 | if (ret == -EEXIST && i >= 0) { |
729 | /* | |
730 | * Account for the slim chance of collision | |
731 | * and append an instance to the name. | |
732 | */ | |
797a8b4d | 733 | kfree(device->name); |
d72e31c9 AW |
734 | device->name = kasprintf(GFP_KERNEL, "%s.%d", |
735 | kobject_name(&dev->kobj), i++); | |
736 | goto rename; | |
737 | } | |
797a8b4d | 738 | goto err_free_name; |
d72e31c9 AW |
739 | } |
740 | ||
741 | kobject_get(group->devices_kobj); | |
742 | ||
743 | dev->iommu_group = group; | |
744 | ||
beed2821 JR |
745 | iommu_group_create_direct_mappings(group, dev); |
746 | ||
d72e31c9 AW |
747 | mutex_lock(&group->mutex); |
748 | list_add_tail(&device->list, &group->devices); | |
e39cb8a3 | 749 | if (group->domain) |
797a8b4d | 750 | ret = __iommu_attach_device(group->domain, dev); |
d72e31c9 | 751 | mutex_unlock(&group->mutex); |
797a8b4d RM |
752 | if (ret) |
753 | goto err_put_group; | |
d72e31c9 AW |
754 | |
755 | /* Notify any listeners about change to group. */ | |
756 | blocking_notifier_call_chain(&group->notifier, | |
757 | IOMMU_GROUP_NOTIFY_ADD_DEVICE, dev); | |
d1cf7e82 SK |
758 | |
759 | trace_add_device_to_group(group->id, dev); | |
269aa808 | 760 | |
780da9e4 | 761 | dev_info(dev, "Adding to iommu group %d\n", group->id); |
269aa808 | 762 | |
1460432c | 763 | return 0; |
797a8b4d RM |
764 | |
765 | err_put_group: | |
766 | mutex_lock(&group->mutex); | |
767 | list_del(&device->list); | |
768 | mutex_unlock(&group->mutex); | |
769 | dev->iommu_group = NULL; | |
770 | kobject_put(group->devices_kobj); | |
7d4e6ccd | 771 | sysfs_remove_link(group->devices_kobj, device->name); |
797a8b4d RM |
772 | err_free_name: |
773 | kfree(device->name); | |
774 | err_remove_link: | |
775 | sysfs_remove_link(&dev->kobj, "iommu_group"); | |
776 | err_free_device: | |
777 | kfree(device); | |
780da9e4 | 778 | dev_err(dev, "Failed to add to iommu group %d: %d\n", group->id, ret); |
797a8b4d | 779 | return ret; |
1460432c | 780 | } |
d72e31c9 | 781 | EXPORT_SYMBOL_GPL(iommu_group_add_device); |
1460432c | 782 | |
d72e31c9 AW |
783 | /** |
784 | * iommu_group_remove_device - remove a device from it's current group | |
785 | * @dev: device to be removed | |
786 | * | |
787 | * This function is called by an iommu driver to remove the device from | |
788 | * it's current group. This decrements the iommu group reference count. | |
789 | */ | |
790 | void iommu_group_remove_device(struct device *dev) | |
791 | { | |
792 | struct iommu_group *group = dev->iommu_group; | |
c09e22d5 | 793 | struct group_device *tmp_device, *device = NULL; |
d72e31c9 | 794 | |
780da9e4 | 795 | dev_info(dev, "Removing from iommu group %d\n", group->id); |
269aa808 | 796 | |
d72e31c9 AW |
797 | /* Pre-notify listeners that a device is being removed. */ |
798 | blocking_notifier_call_chain(&group->notifier, | |
799 | IOMMU_GROUP_NOTIFY_DEL_DEVICE, dev); | |
800 | ||
801 | mutex_lock(&group->mutex); | |
802 | list_for_each_entry(tmp_device, &group->devices, list) { | |
803 | if (tmp_device->dev == dev) { | |
804 | device = tmp_device; | |
805 | list_del(&device->list); | |
806 | break; | |
807 | } | |
808 | } | |
809 | mutex_unlock(&group->mutex); | |
810 | ||
811 | if (!device) | |
812 | return; | |
813 | ||
814 | sysfs_remove_link(group->devices_kobj, device->name); | |
815 | sysfs_remove_link(&dev->kobj, "iommu_group"); | |
816 | ||
2e757086 SK |
817 | trace_remove_device_from_group(group->id, dev); |
818 | ||
d72e31c9 AW |
819 | kfree(device->name); |
820 | kfree(device); | |
821 | dev->iommu_group = NULL; | |
822 | kobject_put(group->devices_kobj); | |
823 | } | |
824 | EXPORT_SYMBOL_GPL(iommu_group_remove_device); | |
825 | ||
426a2738 JR |
826 | static int iommu_group_device_count(struct iommu_group *group) |
827 | { | |
c09e22d5 | 828 | struct group_device *entry; |
426a2738 JR |
829 | int ret = 0; |
830 | ||
831 | list_for_each_entry(entry, &group->devices, list) | |
832 | ret++; | |
833 | ||
834 | return ret; | |
835 | } | |
836 | ||
d72e31c9 AW |
837 | /** |
838 | * iommu_group_for_each_dev - iterate over each device in the group | |
839 | * @group: the group | |
840 | * @data: caller opaque data to be passed to callback function | |
841 | * @fn: caller supplied callback function | |
842 | * | |
843 | * This function is called by group users to iterate over group devices. | |
844 | * Callers should hold a reference count to the group during callback. | |
845 | * The group->mutex is held across callbacks, which will block calls to | |
846 | * iommu_group_add/remove_device. | |
847 | */ | |
e39cb8a3 JR |
848 | static int __iommu_group_for_each_dev(struct iommu_group *group, void *data, |
849 | int (*fn)(struct device *, void *)) | |
d72e31c9 | 850 | { |
c09e22d5 | 851 | struct group_device *device; |
d72e31c9 AW |
852 | int ret = 0; |
853 | ||
d72e31c9 AW |
854 | list_for_each_entry(device, &group->devices, list) { |
855 | ret = fn(device->dev, data); | |
856 | if (ret) | |
857 | break; | |
858 | } | |
e39cb8a3 JR |
859 | return ret; |
860 | } | |
861 | ||
862 | ||
863 | int iommu_group_for_each_dev(struct iommu_group *group, void *data, | |
864 | int (*fn)(struct device *, void *)) | |
865 | { | |
866 | int ret; | |
867 | ||
868 | mutex_lock(&group->mutex); | |
869 | ret = __iommu_group_for_each_dev(group, data, fn); | |
d72e31c9 | 870 | mutex_unlock(&group->mutex); |
e39cb8a3 | 871 | |
d72e31c9 AW |
872 | return ret; |
873 | } | |
874 | EXPORT_SYMBOL_GPL(iommu_group_for_each_dev); | |
875 | ||
876 | /** | |
877 | * iommu_group_get - Return the group for a device and increment reference | |
878 | * @dev: get the group that this device belongs to | |
879 | * | |
880 | * This function is called by iommu drivers and users to get the group | |
881 | * for the specified device. If found, the group is returned and the group | |
882 | * reference in incremented, else NULL. | |
883 | */ | |
884 | struct iommu_group *iommu_group_get(struct device *dev) | |
885 | { | |
886 | struct iommu_group *group = dev->iommu_group; | |
887 | ||
888 | if (group) | |
889 | kobject_get(group->devices_kobj); | |
890 | ||
891 | return group; | |
892 | } | |
893 | EXPORT_SYMBOL_GPL(iommu_group_get); | |
894 | ||
13f59a78 RM |
895 | /** |
896 | * iommu_group_ref_get - Increment reference on a group | |
897 | * @group: the group to use, must not be NULL | |
898 | * | |
899 | * This function is called by iommu drivers to take additional references on an | |
900 | * existing group. Returns the given group for convenience. | |
901 | */ | |
902 | struct iommu_group *iommu_group_ref_get(struct iommu_group *group) | |
903 | { | |
904 | kobject_get(group->devices_kobj); | |
905 | return group; | |
906 | } | |
a7ba5c3d | 907 | EXPORT_SYMBOL_GPL(iommu_group_ref_get); |
13f59a78 | 908 | |
d72e31c9 AW |
909 | /** |
910 | * iommu_group_put - Decrement group reference | |
911 | * @group: the group to use | |
912 | * | |
913 | * This function is called by iommu drivers and users to release the | |
914 | * iommu group. Once the reference count is zero, the group is released. | |
915 | */ | |
916 | void iommu_group_put(struct iommu_group *group) | |
917 | { | |
918 | if (group) | |
919 | kobject_put(group->devices_kobj); | |
920 | } | |
921 | EXPORT_SYMBOL_GPL(iommu_group_put); | |
922 | ||
923 | /** | |
924 | * iommu_group_register_notifier - Register a notifier for group changes | |
925 | * @group: the group to watch | |
926 | * @nb: notifier block to signal | |
927 | * | |
928 | * This function allows iommu group users to track changes in a group. | |
929 | * See include/linux/iommu.h for actions sent via this notifier. Caller | |
930 | * should hold a reference to the group throughout notifier registration. | |
931 | */ | |
932 | int iommu_group_register_notifier(struct iommu_group *group, | |
933 | struct notifier_block *nb) | |
934 | { | |
935 | return blocking_notifier_chain_register(&group->notifier, nb); | |
936 | } | |
937 | EXPORT_SYMBOL_GPL(iommu_group_register_notifier); | |
938 | ||
939 | /** | |
940 | * iommu_group_unregister_notifier - Unregister a notifier | |
941 | * @group: the group to watch | |
942 | * @nb: notifier block to signal | |
943 | * | |
944 | * Unregister a previously registered group notifier block. | |
945 | */ | |
946 | int iommu_group_unregister_notifier(struct iommu_group *group, | |
947 | struct notifier_block *nb) | |
948 | { | |
949 | return blocking_notifier_chain_unregister(&group->notifier, nb); | |
950 | } | |
951 | EXPORT_SYMBOL_GPL(iommu_group_unregister_notifier); | |
952 | ||
0c830e6b JP |
953 | /** |
954 | * iommu_register_device_fault_handler() - Register a device fault handler | |
955 | * @dev: the device | |
956 | * @handler: the fault handler | |
957 | * @data: private data passed as argument to the handler | |
958 | * | |
959 | * When an IOMMU fault event is received, this handler gets called with the | |
bf3255b3 JPB |
960 | * fault event and data as argument. The handler should return 0 on success. If |
961 | * the fault is recoverable (IOMMU_FAULT_PAGE_REQ), the consumer should also | |
962 | * complete the fault by calling iommu_page_response() with one of the following | |
963 | * response code: | |
964 | * - IOMMU_PAGE_RESP_SUCCESS: retry the translation | |
965 | * - IOMMU_PAGE_RESP_INVALID: terminate the fault | |
966 | * - IOMMU_PAGE_RESP_FAILURE: terminate the fault and stop reporting | |
967 | * page faults if possible. | |
0c830e6b JP |
968 | * |
969 | * Return 0 if the fault handler was installed successfully, or an error. | |
970 | */ | |
971 | int iommu_register_device_fault_handler(struct device *dev, | |
972 | iommu_dev_fault_handler_t handler, | |
973 | void *data) | |
974 | { | |
975 | struct iommu_param *param = dev->iommu_param; | |
976 | int ret = 0; | |
977 | ||
978 | if (!param) | |
979 | return -EINVAL; | |
980 | ||
981 | mutex_lock(¶m->lock); | |
982 | /* Only allow one fault handler registered for each device */ | |
983 | if (param->fault_param) { | |
984 | ret = -EBUSY; | |
985 | goto done_unlock; | |
986 | } | |
987 | ||
988 | get_device(dev); | |
989 | param->fault_param = kzalloc(sizeof(*param->fault_param), GFP_KERNEL); | |
990 | if (!param->fault_param) { | |
991 | put_device(dev); | |
992 | ret = -ENOMEM; | |
993 | goto done_unlock; | |
994 | } | |
995 | param->fault_param->handler = handler; | |
996 | param->fault_param->data = data; | |
bf3255b3 JPB |
997 | mutex_init(¶m->fault_param->lock); |
998 | INIT_LIST_HEAD(¶m->fault_param->faults); | |
0c830e6b JP |
999 | |
1000 | done_unlock: | |
1001 | mutex_unlock(¶m->lock); | |
1002 | ||
1003 | return ret; | |
1004 | } | |
1005 | EXPORT_SYMBOL_GPL(iommu_register_device_fault_handler); | |
1006 | ||
1007 | /** | |
1008 | * iommu_unregister_device_fault_handler() - Unregister the device fault handler | |
1009 | * @dev: the device | |
1010 | * | |
1011 | * Remove the device fault handler installed with | |
1012 | * iommu_register_device_fault_handler(). | |
1013 | * | |
1014 | * Return 0 on success, or an error. | |
1015 | */ | |
1016 | int iommu_unregister_device_fault_handler(struct device *dev) | |
1017 | { | |
1018 | struct iommu_param *param = dev->iommu_param; | |
1019 | int ret = 0; | |
1020 | ||
1021 | if (!param) | |
1022 | return -EINVAL; | |
1023 | ||
1024 | mutex_lock(¶m->lock); | |
1025 | ||
1026 | if (!param->fault_param) | |
1027 | goto unlock; | |
1028 | ||
bf3255b3 JPB |
1029 | /* we cannot unregister handler if there are pending faults */ |
1030 | if (!list_empty(¶m->fault_param->faults)) { | |
1031 | ret = -EBUSY; | |
1032 | goto unlock; | |
1033 | } | |
1034 | ||
0c830e6b JP |
1035 | kfree(param->fault_param); |
1036 | param->fault_param = NULL; | |
1037 | put_device(dev); | |
1038 | unlock: | |
1039 | mutex_unlock(¶m->lock); | |
1040 | ||
1041 | return ret; | |
1042 | } | |
1043 | EXPORT_SYMBOL_GPL(iommu_unregister_device_fault_handler); | |
1044 | ||
1045 | /** | |
1046 | * iommu_report_device_fault() - Report fault event to device driver | |
1047 | * @dev: the device | |
1048 | * @evt: fault event data | |
1049 | * | |
1050 | * Called by IOMMU drivers when a fault is detected, typically in a threaded IRQ | |
bf3255b3 JPB |
1051 | * handler. When this function fails and the fault is recoverable, it is the |
1052 | * caller's responsibility to complete the fault. | |
0c830e6b JP |
1053 | * |
1054 | * Return 0 on success, or an error. | |
1055 | */ | |
1056 | int iommu_report_device_fault(struct device *dev, struct iommu_fault_event *evt) | |
1057 | { | |
1058 | struct iommu_param *param = dev->iommu_param; | |
bf3255b3 | 1059 | struct iommu_fault_event *evt_pending = NULL; |
0c830e6b JP |
1060 | struct iommu_fault_param *fparam; |
1061 | int ret = 0; | |
1062 | ||
1063 | if (!param || !evt) | |
1064 | return -EINVAL; | |
1065 | ||
1066 | /* we only report device fault if there is a handler registered */ | |
1067 | mutex_lock(¶m->lock); | |
1068 | fparam = param->fault_param; | |
1069 | if (!fparam || !fparam->handler) { | |
1070 | ret = -EINVAL; | |
1071 | goto done_unlock; | |
1072 | } | |
bf3255b3 JPB |
1073 | |
1074 | if (evt->fault.type == IOMMU_FAULT_PAGE_REQ && | |
1075 | (evt->fault.prm.flags & IOMMU_FAULT_PAGE_REQUEST_LAST_PAGE)) { | |
1076 | evt_pending = kmemdup(evt, sizeof(struct iommu_fault_event), | |
1077 | GFP_KERNEL); | |
1078 | if (!evt_pending) { | |
1079 | ret = -ENOMEM; | |
1080 | goto done_unlock; | |
1081 | } | |
1082 | mutex_lock(&fparam->lock); | |
1083 | list_add_tail(&evt_pending->list, &fparam->faults); | |
1084 | mutex_unlock(&fparam->lock); | |
1085 | } | |
1086 | ||
0c830e6b | 1087 | ret = fparam->handler(&evt->fault, fparam->data); |
bf3255b3 JPB |
1088 | if (ret && evt_pending) { |
1089 | mutex_lock(&fparam->lock); | |
1090 | list_del(&evt_pending->list); | |
1091 | mutex_unlock(&fparam->lock); | |
1092 | kfree(evt_pending); | |
1093 | } | |
0c830e6b JP |
1094 | done_unlock: |
1095 | mutex_unlock(¶m->lock); | |
1096 | return ret; | |
1097 | } | |
1098 | EXPORT_SYMBOL_GPL(iommu_report_device_fault); | |
1099 | ||
bf3255b3 JPB |
1100 | int iommu_page_response(struct device *dev, |
1101 | struct iommu_page_response *msg) | |
1102 | { | |
1103 | bool pasid_valid; | |
1104 | int ret = -EINVAL; | |
1105 | struct iommu_fault_event *evt; | |
1106 | struct iommu_fault_page_request *prm; | |
1107 | struct iommu_param *param = dev->iommu_param; | |
1108 | struct iommu_domain *domain = iommu_get_domain_for_dev(dev); | |
1109 | ||
1110 | if (!domain || !domain->ops->page_response) | |
1111 | return -ENODEV; | |
1112 | ||
1113 | if (!param || !param->fault_param) | |
1114 | return -EINVAL; | |
1115 | ||
1116 | if (msg->version != IOMMU_PAGE_RESP_VERSION_1 || | |
1117 | msg->flags & ~IOMMU_PAGE_RESP_PASID_VALID) | |
1118 | return -EINVAL; | |
1119 | ||
1120 | /* Only send response if there is a fault report pending */ | |
1121 | mutex_lock(¶m->fault_param->lock); | |
1122 | if (list_empty(¶m->fault_param->faults)) { | |
1123 | dev_warn_ratelimited(dev, "no pending PRQ, drop response\n"); | |
1124 | goto done_unlock; | |
1125 | } | |
1126 | /* | |
1127 | * Check if we have a matching page request pending to respond, | |
1128 | * otherwise return -EINVAL | |
1129 | */ | |
1130 | list_for_each_entry(evt, ¶m->fault_param->faults, list) { | |
1131 | prm = &evt->fault.prm; | |
1132 | pasid_valid = prm->flags & IOMMU_FAULT_PAGE_REQUEST_PASID_VALID; | |
1133 | ||
1134 | if ((pasid_valid && prm->pasid != msg->pasid) || | |
1135 | prm->grpid != msg->grpid) | |
1136 | continue; | |
1137 | ||
1138 | /* Sanitize the reply */ | |
1139 | msg->flags = pasid_valid ? IOMMU_PAGE_RESP_PASID_VALID : 0; | |
1140 | ||
1141 | ret = domain->ops->page_response(dev, evt, msg); | |
1142 | list_del(&evt->list); | |
1143 | kfree(evt); | |
1144 | break; | |
1145 | } | |
1146 | ||
1147 | done_unlock: | |
1148 | mutex_unlock(¶m->fault_param->lock); | |
1149 | return ret; | |
1150 | } | |
1151 | EXPORT_SYMBOL_GPL(iommu_page_response); | |
1152 | ||
d72e31c9 AW |
1153 | /** |
1154 | * iommu_group_id - Return ID for a group | |
1155 | * @group: the group to ID | |
1156 | * | |
1157 | * Return the unique ID for the group matching the sysfs group number. | |
1158 | */ | |
1159 | int iommu_group_id(struct iommu_group *group) | |
1160 | { | |
1161 | return group->id; | |
1162 | } | |
1163 | EXPORT_SYMBOL_GPL(iommu_group_id); | |
1460432c | 1164 | |
f096c061 AW |
1165 | static struct iommu_group *get_pci_alias_group(struct pci_dev *pdev, |
1166 | unsigned long *devfns); | |
1167 | ||
104a1c13 AW |
1168 | /* |
1169 | * To consider a PCI device isolated, we require ACS to support Source | |
1170 | * Validation, Request Redirection, Completer Redirection, and Upstream | |
1171 | * Forwarding. This effectively means that devices cannot spoof their | |
1172 | * requester ID, requests and completions cannot be redirected, and all | |
1173 | * transactions are forwarded upstream, even as it passes through a | |
1174 | * bridge where the target device is downstream. | |
1175 | */ | |
1176 | #define REQ_ACS_FLAGS (PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF) | |
1177 | ||
f096c061 AW |
1178 | /* |
1179 | * For multifunction devices which are not isolated from each other, find | |
1180 | * all the other non-isolated functions and look for existing groups. For | |
1181 | * each function, we also need to look for aliases to or from other devices | |
1182 | * that may already have a group. | |
1183 | */ | |
1184 | static struct iommu_group *get_pci_function_alias_group(struct pci_dev *pdev, | |
1185 | unsigned long *devfns) | |
1186 | { | |
1187 | struct pci_dev *tmp = NULL; | |
1188 | struct iommu_group *group; | |
1189 | ||
1190 | if (!pdev->multifunction || pci_acs_enabled(pdev, REQ_ACS_FLAGS)) | |
1191 | return NULL; | |
1192 | ||
1193 | for_each_pci_dev(tmp) { | |
1194 | if (tmp == pdev || tmp->bus != pdev->bus || | |
1195 | PCI_SLOT(tmp->devfn) != PCI_SLOT(pdev->devfn) || | |
1196 | pci_acs_enabled(tmp, REQ_ACS_FLAGS)) | |
1197 | continue; | |
1198 | ||
1199 | group = get_pci_alias_group(tmp, devfns); | |
1200 | if (group) { | |
1201 | pci_dev_put(tmp); | |
1202 | return group; | |
1203 | } | |
1204 | } | |
1205 | ||
1206 | return NULL; | |
1207 | } | |
1208 | ||
1209 | /* | |
338c3149 JL |
1210 | * Look for aliases to or from the given device for existing groups. DMA |
1211 | * aliases are only supported on the same bus, therefore the search | |
f096c061 AW |
1212 | * space is quite small (especially since we're really only looking at pcie |
1213 | * device, and therefore only expect multiple slots on the root complex or | |
1214 | * downstream switch ports). It's conceivable though that a pair of | |
1215 | * multifunction devices could have aliases between them that would cause a | |
1216 | * loop. To prevent this, we use a bitmap to track where we've been. | |
1217 | */ | |
1218 | static struct iommu_group *get_pci_alias_group(struct pci_dev *pdev, | |
1219 | unsigned long *devfns) | |
1220 | { | |
1221 | struct pci_dev *tmp = NULL; | |
1222 | struct iommu_group *group; | |
1223 | ||
1224 | if (test_and_set_bit(pdev->devfn & 0xff, devfns)) | |
1225 | return NULL; | |
1226 | ||
1227 | group = iommu_group_get(&pdev->dev); | |
1228 | if (group) | |
1229 | return group; | |
1230 | ||
1231 | for_each_pci_dev(tmp) { | |
1232 | if (tmp == pdev || tmp->bus != pdev->bus) | |
1233 | continue; | |
1234 | ||
1235 | /* We alias them or they alias us */ | |
338c3149 | 1236 | if (pci_devs_are_dma_aliases(pdev, tmp)) { |
f096c061 AW |
1237 | group = get_pci_alias_group(tmp, devfns); |
1238 | if (group) { | |
1239 | pci_dev_put(tmp); | |
1240 | return group; | |
1241 | } | |
1242 | ||
1243 | group = get_pci_function_alias_group(tmp, devfns); | |
1244 | if (group) { | |
1245 | pci_dev_put(tmp); | |
1246 | return group; | |
1247 | } | |
1248 | } | |
1249 | } | |
1250 | ||
1251 | return NULL; | |
1252 | } | |
1253 | ||
104a1c13 AW |
1254 | struct group_for_pci_data { |
1255 | struct pci_dev *pdev; | |
1256 | struct iommu_group *group; | |
1257 | }; | |
1258 | ||
1259 | /* | |
1260 | * DMA alias iterator callback, return the last seen device. Stop and return | |
1261 | * the IOMMU group if we find one along the way. | |
1262 | */ | |
1263 | static int get_pci_alias_or_group(struct pci_dev *pdev, u16 alias, void *opaque) | |
1264 | { | |
1265 | struct group_for_pci_data *data = opaque; | |
1266 | ||
1267 | data->pdev = pdev; | |
1268 | data->group = iommu_group_get(&pdev->dev); | |
1269 | ||
1270 | return data->group != NULL; | |
1271 | } | |
1272 | ||
6eab556a JR |
1273 | /* |
1274 | * Generic device_group call-back function. It just allocates one | |
1275 | * iommu-group per device. | |
1276 | */ | |
1277 | struct iommu_group *generic_device_group(struct device *dev) | |
1278 | { | |
7f7a2304 | 1279 | return iommu_group_alloc(); |
6eab556a | 1280 | } |
a7ba5c3d | 1281 | EXPORT_SYMBOL_GPL(generic_device_group); |
6eab556a | 1282 | |
104a1c13 AW |
1283 | /* |
1284 | * Use standard PCI bus topology, isolation features, and DMA alias quirks | |
1285 | * to find or create an IOMMU group for a device. | |
1286 | */ | |
5e62292b | 1287 | struct iommu_group *pci_device_group(struct device *dev) |
104a1c13 | 1288 | { |
5e62292b | 1289 | struct pci_dev *pdev = to_pci_dev(dev); |
104a1c13 AW |
1290 | struct group_for_pci_data data; |
1291 | struct pci_bus *bus; | |
1292 | struct iommu_group *group = NULL; | |
f096c061 | 1293 | u64 devfns[4] = { 0 }; |
104a1c13 | 1294 | |
5e62292b JR |
1295 | if (WARN_ON(!dev_is_pci(dev))) |
1296 | return ERR_PTR(-EINVAL); | |
1297 | ||
104a1c13 AW |
1298 | /* |
1299 | * Find the upstream DMA alias for the device. A device must not | |
1300 | * be aliased due to topology in order to have its own IOMMU group. | |
1301 | * If we find an alias along the way that already belongs to a | |
1302 | * group, use it. | |
1303 | */ | |
1304 | if (pci_for_each_dma_alias(pdev, get_pci_alias_or_group, &data)) | |
1305 | return data.group; | |
1306 | ||
1307 | pdev = data.pdev; | |
1308 | ||
1309 | /* | |
1310 | * Continue upstream from the point of minimum IOMMU granularity | |
1311 | * due to aliases to the point where devices are protected from | |
1312 | * peer-to-peer DMA by PCI ACS. Again, if we find an existing | |
1313 | * group, use it. | |
1314 | */ | |
1315 | for (bus = pdev->bus; !pci_is_root_bus(bus); bus = bus->parent) { | |
1316 | if (!bus->self) | |
1317 | continue; | |
1318 | ||
1319 | if (pci_acs_path_enabled(bus->self, NULL, REQ_ACS_FLAGS)) | |
1320 | break; | |
1321 | ||
1322 | pdev = bus->self; | |
1323 | ||
1324 | group = iommu_group_get(&pdev->dev); | |
1325 | if (group) | |
1326 | return group; | |
1327 | } | |
1328 | ||
1329 | /* | |
f096c061 AW |
1330 | * Look for existing groups on device aliases. If we alias another |
1331 | * device or another device aliases us, use the same group. | |
104a1c13 | 1332 | */ |
f096c061 AW |
1333 | group = get_pci_alias_group(pdev, (unsigned long *)devfns); |
1334 | if (group) | |
1335 | return group; | |
104a1c13 AW |
1336 | |
1337 | /* | |
f096c061 AW |
1338 | * Look for existing groups on non-isolated functions on the same |
1339 | * slot and aliases of those funcions, if any. No need to clear | |
1340 | * the search bitmap, the tested devfns are still valid. | |
104a1c13 | 1341 | */ |
f096c061 AW |
1342 | group = get_pci_function_alias_group(pdev, (unsigned long *)devfns); |
1343 | if (group) | |
1344 | return group; | |
104a1c13 AW |
1345 | |
1346 | /* No shared group found, allocate new */ | |
7f7a2304 | 1347 | return iommu_group_alloc(); |
104a1c13 | 1348 | } |
a7ba5c3d | 1349 | EXPORT_SYMBOL_GPL(pci_device_group); |
104a1c13 | 1350 | |
eab03e2a NG |
1351 | /* Get the IOMMU group for device on fsl-mc bus */ |
1352 | struct iommu_group *fsl_mc_device_group(struct device *dev) | |
1353 | { | |
1354 | struct device *cont_dev = fsl_mc_cont_dev(dev); | |
1355 | struct iommu_group *group; | |
1356 | ||
1357 | group = iommu_group_get(cont_dev); | |
1358 | if (!group) | |
1359 | group = iommu_group_alloc(); | |
1360 | return group; | |
1361 | } | |
a7ba5c3d | 1362 | EXPORT_SYMBOL_GPL(fsl_mc_device_group); |
eab03e2a | 1363 | |
104a1c13 AW |
1364 | /** |
1365 | * iommu_group_get_for_dev - Find or create the IOMMU group for a device | |
1366 | * @dev: target device | |
1367 | * | |
1368 | * This function is intended to be called by IOMMU drivers and extended to | |
1369 | * support common, bus-defined algorithms when determining or creating the | |
1370 | * IOMMU group for a device. On success, the caller will hold a reference | |
1371 | * to the returned IOMMU group, which will already include the provided | |
1372 | * device. The reference should be released with iommu_group_put(). | |
1373 | */ | |
1374 | struct iommu_group *iommu_group_get_for_dev(struct device *dev) | |
1375 | { | |
46c6b2bc | 1376 | const struct iommu_ops *ops = dev->bus->iommu_ops; |
c4a783b8 | 1377 | struct iommu_group *group; |
104a1c13 AW |
1378 | int ret; |
1379 | ||
1380 | group = iommu_group_get(dev); | |
1381 | if (group) | |
1382 | return group; | |
1383 | ||
05f80300 RM |
1384 | if (!ops) |
1385 | return ERR_PTR(-EINVAL); | |
104a1c13 | 1386 | |
05f80300 | 1387 | group = ops->device_group(dev); |
72dcac63 JR |
1388 | if (WARN_ON_ONCE(group == NULL)) |
1389 | return ERR_PTR(-EINVAL); | |
1390 | ||
104a1c13 AW |
1391 | if (IS_ERR(group)) |
1392 | return group; | |
1393 | ||
1228236d JR |
1394 | /* |
1395 | * Try to allocate a default domain - needs support from the | |
1396 | * IOMMU driver. | |
1397 | */ | |
1398 | if (!group->default_domain) { | |
fccb4e3b WD |
1399 | struct iommu_domain *dom; |
1400 | ||
1401 | dom = __iommu_domain_alloc(dev->bus, iommu_def_domain_type); | |
1402 | if (!dom && iommu_def_domain_type != IOMMU_DOMAIN_DMA) { | |
fccb4e3b | 1403 | dom = __iommu_domain_alloc(dev->bus, IOMMU_DOMAIN_DMA); |
8bc32a28 JR |
1404 | if (dom) { |
1405 | dev_warn(dev, | |
1406 | "failed to allocate default IOMMU domain of type %u; falling back to IOMMU_DOMAIN_DMA", | |
1407 | iommu_def_domain_type); | |
1408 | } | |
fccb4e3b WD |
1409 | } |
1410 | ||
1411 | group->default_domain = dom; | |
eebb8034 | 1412 | if (!group->domain) |
fccb4e3b | 1413 | group->domain = dom; |
68a6efe8 ZL |
1414 | |
1415 | if (dom && !iommu_dma_strict) { | |
1416 | int attr = 1; | |
1417 | iommu_domain_set_attr(dom, | |
1418 | DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE, | |
1419 | &attr); | |
1420 | } | |
1228236d JR |
1421 | } |
1422 | ||
104a1c13 AW |
1423 | ret = iommu_group_add_device(group, dev); |
1424 | if (ret) { | |
1425 | iommu_group_put(group); | |
1426 | return ERR_PTR(ret); | |
1427 | } | |
1428 | ||
1429 | return group; | |
1430 | } | |
a7ba5c3d | 1431 | EXPORT_SYMBOL(iommu_group_get_for_dev); |
104a1c13 | 1432 | |
6827ca83 JR |
1433 | struct iommu_domain *iommu_group_default_domain(struct iommu_group *group) |
1434 | { | |
1435 | return group->default_domain; | |
1436 | } | |
1437 | ||
d72e31c9 | 1438 | static int add_iommu_group(struct device *dev, void *data) |
1460432c | 1439 | { |
cc5aed44 | 1440 | int ret = iommu_probe_device(dev); |
38667f18 JR |
1441 | |
1442 | /* | |
1443 | * We ignore -ENODEV errors for now, as they just mean that the | |
1444 | * device is not translated by an IOMMU. We still care about | |
1445 | * other errors and fail to initialize when they happen. | |
1446 | */ | |
1447 | if (ret == -ENODEV) | |
1448 | ret = 0; | |
1449 | ||
1450 | return ret; | |
1460432c AW |
1451 | } |
1452 | ||
8da30142 JR |
1453 | static int remove_iommu_group(struct device *dev, void *data) |
1454 | { | |
cc5aed44 | 1455 | iommu_release_device(dev); |
1460432c AW |
1456 | |
1457 | return 0; | |
1458 | } | |
1459 | ||
d72e31c9 AW |
1460 | static int iommu_bus_notifier(struct notifier_block *nb, |
1461 | unsigned long action, void *data) | |
1460432c | 1462 | { |
cc5aed44 | 1463 | unsigned long group_action = 0; |
1460432c | 1464 | struct device *dev = data; |
d72e31c9 | 1465 | struct iommu_group *group; |
d72e31c9 AW |
1466 | |
1467 | /* | |
1468 | * ADD/DEL call into iommu driver ops if provided, which may | |
1469 | * result in ADD/DEL notifiers to group->notifier | |
1470 | */ | |
1471 | if (action == BUS_NOTIFY_ADD_DEVICE) { | |
cc5aed44 | 1472 | int ret; |
3ba8775f | 1473 | |
cc5aed44 JR |
1474 | ret = iommu_probe_device(dev); |
1475 | return (ret) ? NOTIFY_DONE : NOTIFY_OK; | |
843cb6dc | 1476 | } else if (action == BUS_NOTIFY_REMOVED_DEVICE) { |
cc5aed44 JR |
1477 | iommu_release_device(dev); |
1478 | return NOTIFY_OK; | |
d72e31c9 | 1479 | } |
1460432c | 1480 | |
d72e31c9 AW |
1481 | /* |
1482 | * Remaining BUS_NOTIFYs get filtered and republished to the | |
1483 | * group, if anyone is listening | |
1484 | */ | |
1485 | group = iommu_group_get(dev); | |
1486 | if (!group) | |
1487 | return 0; | |
1460432c | 1488 | |
d72e31c9 AW |
1489 | switch (action) { |
1490 | case BUS_NOTIFY_BIND_DRIVER: | |
1491 | group_action = IOMMU_GROUP_NOTIFY_BIND_DRIVER; | |
1492 | break; | |
1493 | case BUS_NOTIFY_BOUND_DRIVER: | |
1494 | group_action = IOMMU_GROUP_NOTIFY_BOUND_DRIVER; | |
1495 | break; | |
1496 | case BUS_NOTIFY_UNBIND_DRIVER: | |
1497 | group_action = IOMMU_GROUP_NOTIFY_UNBIND_DRIVER; | |
1498 | break; | |
1499 | case BUS_NOTIFY_UNBOUND_DRIVER: | |
1500 | group_action = IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER; | |
1501 | break; | |
1502 | } | |
1460432c | 1503 | |
d72e31c9 AW |
1504 | if (group_action) |
1505 | blocking_notifier_call_chain(&group->notifier, | |
1506 | group_action, dev); | |
1460432c | 1507 | |
d72e31c9 | 1508 | iommu_group_put(group); |
1460432c AW |
1509 | return 0; |
1510 | } | |
1511 | ||
fb3e3065 | 1512 | static int iommu_bus_init(struct bus_type *bus, const struct iommu_ops *ops) |
ff21776d | 1513 | { |
fb3e3065 MS |
1514 | int err; |
1515 | struct notifier_block *nb; | |
b22f6434 | 1516 | |
fb3e3065 MS |
1517 | nb = kzalloc(sizeof(struct notifier_block), GFP_KERNEL); |
1518 | if (!nb) | |
1519 | return -ENOMEM; | |
1520 | ||
1521 | nb->notifier_call = iommu_bus_notifier; | |
1522 | ||
1523 | err = bus_register_notifier(bus, nb); | |
8da30142 JR |
1524 | if (err) |
1525 | goto out_free; | |
d7da6bdc | 1526 | |
8cec63e5 | 1527 | err = bus_for_each_dev(bus, NULL, NULL, add_iommu_group); |
8da30142 JR |
1528 | if (err) |
1529 | goto out_err; | |
1530 | ||
d7da6bdc HS |
1531 | |
1532 | return 0; | |
8da30142 JR |
1533 | |
1534 | out_err: | |
1535 | /* Clean up */ | |
8cec63e5 | 1536 | bus_for_each_dev(bus, NULL, NULL, remove_iommu_group); |
8da30142 JR |
1537 | bus_unregister_notifier(bus, nb); |
1538 | ||
1539 | out_free: | |
1540 | kfree(nb); | |
1541 | ||
1542 | return err; | |
ff21776d | 1543 | } |
fc2100eb | 1544 | |
ff21776d JR |
1545 | /** |
1546 | * bus_set_iommu - set iommu-callbacks for the bus | |
1547 | * @bus: bus. | |
1548 | * @ops: the callbacks provided by the iommu-driver | |
1549 | * | |
1550 | * This function is called by an iommu driver to set the iommu methods | |
1551 | * used for a particular bus. Drivers for devices on that bus can use | |
1552 | * the iommu-api after these ops are registered. | |
1553 | * This special function is needed because IOMMUs are usually devices on | |
1554 | * the bus itself, so the iommu drivers are not initialized when the bus | |
1555 | * is set up. With this function the iommu-driver can set the iommu-ops | |
1556 | * afterwards. | |
1557 | */ | |
b22f6434 | 1558 | int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops) |
fc2100eb | 1559 | { |
d7da6bdc HS |
1560 | int err; |
1561 | ||
4312cf7f WD |
1562 | if (ops == NULL) { |
1563 | bus->iommu_ops = NULL; | |
1564 | return 0; | |
1565 | } | |
1566 | ||
ff21776d JR |
1567 | if (bus->iommu_ops != NULL) |
1568 | return -EBUSY; | |
fc2100eb | 1569 | |
ff21776d JR |
1570 | bus->iommu_ops = ops; |
1571 | ||
1572 | /* Do IOMMU specific setup for this bus-type */ | |
d7da6bdc HS |
1573 | err = iommu_bus_init(bus, ops); |
1574 | if (err) | |
1575 | bus->iommu_ops = NULL; | |
1576 | ||
1577 | return err; | |
fc2100eb | 1578 | } |
ff21776d | 1579 | EXPORT_SYMBOL_GPL(bus_set_iommu); |
fc2100eb | 1580 | |
a1b60c1c | 1581 | bool iommu_present(struct bus_type *bus) |
fc2100eb | 1582 | { |
94441c3b | 1583 | return bus->iommu_ops != NULL; |
fc2100eb | 1584 | } |
a1b60c1c | 1585 | EXPORT_SYMBOL_GPL(iommu_present); |
fc2100eb | 1586 | |
3c0e0ca0 JR |
1587 | bool iommu_capable(struct bus_type *bus, enum iommu_cap cap) |
1588 | { | |
1589 | if (!bus->iommu_ops || !bus->iommu_ops->capable) | |
1590 | return false; | |
1591 | ||
1592 | return bus->iommu_ops->capable(cap); | |
1593 | } | |
1594 | EXPORT_SYMBOL_GPL(iommu_capable); | |
1595 | ||
4f3f8d9d OBC |
1596 | /** |
1597 | * iommu_set_fault_handler() - set a fault handler for an iommu domain | |
1598 | * @domain: iommu domain | |
1599 | * @handler: fault handler | |
77ca2332 | 1600 | * @token: user data, will be passed back to the fault handler |
0ed6d2d2 OBC |
1601 | * |
1602 | * This function should be used by IOMMU users which want to be notified | |
1603 | * whenever an IOMMU fault happens. | |
1604 | * | |
1605 | * The fault handler itself should return 0 on success, and an appropriate | |
1606 | * error code otherwise. | |
4f3f8d9d OBC |
1607 | */ |
1608 | void iommu_set_fault_handler(struct iommu_domain *domain, | |
77ca2332 OBC |
1609 | iommu_fault_handler_t handler, |
1610 | void *token) | |
4f3f8d9d OBC |
1611 | { |
1612 | BUG_ON(!domain); | |
1613 | ||
1614 | domain->handler = handler; | |
77ca2332 | 1615 | domain->handler_token = token; |
4f3f8d9d | 1616 | } |
30bd918c | 1617 | EXPORT_SYMBOL_GPL(iommu_set_fault_handler); |
4f3f8d9d | 1618 | |
53723dc5 JR |
1619 | static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus, |
1620 | unsigned type) | |
fc2100eb JR |
1621 | { |
1622 | struct iommu_domain *domain; | |
fc2100eb | 1623 | |
94441c3b | 1624 | if (bus == NULL || bus->iommu_ops == NULL) |
905d66c1 JR |
1625 | return NULL; |
1626 | ||
53723dc5 | 1627 | domain = bus->iommu_ops->domain_alloc(type); |
fc2100eb JR |
1628 | if (!domain) |
1629 | return NULL; | |
1630 | ||
8539c7c1 | 1631 | domain->ops = bus->iommu_ops; |
53723dc5 | 1632 | domain->type = type; |
d16e0faa RM |
1633 | /* Assume all sizes by default; the driver may override this later */ |
1634 | domain->pgsize_bitmap = bus->iommu_ops->pgsize_bitmap; | |
905d66c1 | 1635 | |
fc2100eb | 1636 | return domain; |
fc2100eb | 1637 | } |
fc2100eb | 1638 | |
53723dc5 JR |
1639 | struct iommu_domain *iommu_domain_alloc(struct bus_type *bus) |
1640 | { | |
1641 | return __iommu_domain_alloc(bus, IOMMU_DOMAIN_UNMANAGED); | |
fc2100eb JR |
1642 | } |
1643 | EXPORT_SYMBOL_GPL(iommu_domain_alloc); | |
1644 | ||
1645 | void iommu_domain_free(struct iommu_domain *domain) | |
1646 | { | |
89be34a1 | 1647 | domain->ops->domain_free(domain); |
fc2100eb JR |
1648 | } |
1649 | EXPORT_SYMBOL_GPL(iommu_domain_free); | |
1650 | ||
426a2738 JR |
1651 | static int __iommu_attach_device(struct iommu_domain *domain, |
1652 | struct device *dev) | |
fc2100eb | 1653 | { |
b54db778 | 1654 | int ret; |
e01d1913 BH |
1655 | if ((domain->ops->is_attach_deferred != NULL) && |
1656 | domain->ops->is_attach_deferred(domain, dev)) | |
1657 | return 0; | |
1658 | ||
e5aa7f00 JR |
1659 | if (unlikely(domain->ops->attach_dev == NULL)) |
1660 | return -ENODEV; | |
1661 | ||
b54db778 SK |
1662 | ret = domain->ops->attach_dev(domain, dev); |
1663 | if (!ret) | |
1664 | trace_attach_device_to_domain(dev); | |
1665 | return ret; | |
fc2100eb | 1666 | } |
426a2738 JR |
1667 | |
1668 | int iommu_attach_device(struct iommu_domain *domain, struct device *dev) | |
1669 | { | |
1670 | struct iommu_group *group; | |
1671 | int ret; | |
1672 | ||
1673 | group = iommu_group_get(dev); | |
9ae9df03 JC |
1674 | if (!group) |
1675 | return -ENODEV; | |
1676 | ||
426a2738 | 1677 | /* |
05f80300 | 1678 | * Lock the group to make sure the device-count doesn't |
426a2738 JR |
1679 | * change while we are attaching |
1680 | */ | |
1681 | mutex_lock(&group->mutex); | |
1682 | ret = -EINVAL; | |
1683 | if (iommu_group_device_count(group) != 1) | |
1684 | goto out_unlock; | |
1685 | ||
e39cb8a3 | 1686 | ret = __iommu_attach_group(domain, group); |
426a2738 JR |
1687 | |
1688 | out_unlock: | |
1689 | mutex_unlock(&group->mutex); | |
1690 | iommu_group_put(group); | |
1691 | ||
1692 | return ret; | |
1693 | } | |
fc2100eb JR |
1694 | EXPORT_SYMBOL_GPL(iommu_attach_device); |
1695 | ||
4c7c171f YL |
1696 | int iommu_cache_invalidate(struct iommu_domain *domain, struct device *dev, |
1697 | struct iommu_cache_invalidate_info *inv_info) | |
1698 | { | |
1699 | if (unlikely(!domain->ops->cache_invalidate)) | |
1700 | return -ENODEV; | |
1701 | ||
1702 | return domain->ops->cache_invalidate(domain, dev, inv_info); | |
1703 | } | |
1704 | EXPORT_SYMBOL_GPL(iommu_cache_invalidate); | |
1705 | ||
808be0aa JP |
1706 | int iommu_sva_bind_gpasid(struct iommu_domain *domain, |
1707 | struct device *dev, struct iommu_gpasid_bind_data *data) | |
1708 | { | |
1709 | if (unlikely(!domain->ops->sva_bind_gpasid)) | |
1710 | return -ENODEV; | |
1711 | ||
1712 | return domain->ops->sva_bind_gpasid(domain, dev, data); | |
1713 | } | |
1714 | EXPORT_SYMBOL_GPL(iommu_sva_bind_gpasid); | |
1715 | ||
1716 | int iommu_sva_unbind_gpasid(struct iommu_domain *domain, struct device *dev, | |
1717 | ioasid_t pasid) | |
1718 | { | |
1719 | if (unlikely(!domain->ops->sva_unbind_gpasid)) | |
1720 | return -ENODEV; | |
1721 | ||
1722 | return domain->ops->sva_unbind_gpasid(dev, pasid); | |
1723 | } | |
1724 | EXPORT_SYMBOL_GPL(iommu_sva_unbind_gpasid); | |
1725 | ||
426a2738 JR |
1726 | static void __iommu_detach_device(struct iommu_domain *domain, |
1727 | struct device *dev) | |
fc2100eb | 1728 | { |
e01d1913 BH |
1729 | if ((domain->ops->is_attach_deferred != NULL) && |
1730 | domain->ops->is_attach_deferred(domain, dev)) | |
1731 | return; | |
1732 | ||
e5aa7f00 JR |
1733 | if (unlikely(domain->ops->detach_dev == NULL)) |
1734 | return; | |
1735 | ||
1736 | domain->ops->detach_dev(domain, dev); | |
69980630 | 1737 | trace_detach_device_from_domain(dev); |
fc2100eb | 1738 | } |
426a2738 JR |
1739 | |
1740 | void iommu_detach_device(struct iommu_domain *domain, struct device *dev) | |
1741 | { | |
1742 | struct iommu_group *group; | |
1743 | ||
1744 | group = iommu_group_get(dev); | |
9ae9df03 JC |
1745 | if (!group) |
1746 | return; | |
426a2738 JR |
1747 | |
1748 | mutex_lock(&group->mutex); | |
1749 | if (iommu_group_device_count(group) != 1) { | |
1750 | WARN_ON(1); | |
1751 | goto out_unlock; | |
1752 | } | |
1753 | ||
e39cb8a3 | 1754 | __iommu_detach_group(domain, group); |
426a2738 JR |
1755 | |
1756 | out_unlock: | |
1757 | mutex_unlock(&group->mutex); | |
1758 | iommu_group_put(group); | |
1759 | } | |
fc2100eb JR |
1760 | EXPORT_SYMBOL_GPL(iommu_detach_device); |
1761 | ||
2c1296d9 JR |
1762 | struct iommu_domain *iommu_get_domain_for_dev(struct device *dev) |
1763 | { | |
1764 | struct iommu_domain *domain; | |
1765 | struct iommu_group *group; | |
1766 | ||
1767 | group = iommu_group_get(dev); | |
1464d0b1 | 1768 | if (!group) |
2c1296d9 JR |
1769 | return NULL; |
1770 | ||
1771 | domain = group->domain; | |
1772 | ||
1773 | iommu_group_put(group); | |
1774 | ||
1775 | return domain; | |
1776 | } | |
1777 | EXPORT_SYMBOL_GPL(iommu_get_domain_for_dev); | |
fc2100eb | 1778 | |
d72e31c9 | 1779 | /* |
6af588fe RM |
1780 | * For IOMMU_DOMAIN_DMA implementations which already provide their own |
1781 | * guarantees that the group and its default domain are valid and correct. | |
1782 | */ | |
1783 | struct iommu_domain *iommu_get_dma_domain(struct device *dev) | |
1784 | { | |
1785 | return dev->iommu_group->default_domain; | |
1786 | } | |
1787 | ||
d72e31c9 | 1788 | /* |
35449adc | 1789 | * IOMMU groups are really the natural working unit of the IOMMU, but |
d72e31c9 AW |
1790 | * the IOMMU API works on domains and devices. Bridge that gap by |
1791 | * iterating over the devices in a group. Ideally we'd have a single | |
1792 | * device which represents the requestor ID of the group, but we also | |
1793 | * allow IOMMU drivers to create policy defined minimum sets, where | |
1794 | * the physical hardware may be able to distiguish members, but we | |
1795 | * wish to group them at a higher level (ex. untrusted multi-function | |
1796 | * PCI devices). Thus we attach each device. | |
1797 | */ | |
1798 | static int iommu_group_do_attach_device(struct device *dev, void *data) | |
1799 | { | |
1800 | struct iommu_domain *domain = data; | |
1801 | ||
426a2738 | 1802 | return __iommu_attach_device(domain, dev); |
d72e31c9 AW |
1803 | } |
1804 | ||
e39cb8a3 JR |
1805 | static int __iommu_attach_group(struct iommu_domain *domain, |
1806 | struct iommu_group *group) | |
1807 | { | |
1808 | int ret; | |
1809 | ||
1810 | if (group->default_domain && group->domain != group->default_domain) | |
1811 | return -EBUSY; | |
1812 | ||
1813 | ret = __iommu_group_for_each_dev(group, domain, | |
1814 | iommu_group_do_attach_device); | |
1815 | if (ret == 0) | |
1816 | group->domain = domain; | |
1817 | ||
1818 | return ret; | |
d72e31c9 AW |
1819 | } |
1820 | ||
1821 | int iommu_attach_group(struct iommu_domain *domain, struct iommu_group *group) | |
1822 | { | |
e39cb8a3 JR |
1823 | int ret; |
1824 | ||
1825 | mutex_lock(&group->mutex); | |
1826 | ret = __iommu_attach_group(domain, group); | |
1827 | mutex_unlock(&group->mutex); | |
1828 | ||
1829 | return ret; | |
d72e31c9 AW |
1830 | } |
1831 | EXPORT_SYMBOL_GPL(iommu_attach_group); | |
1832 | ||
1833 | static int iommu_group_do_detach_device(struct device *dev, void *data) | |
1834 | { | |
1835 | struct iommu_domain *domain = data; | |
1836 | ||
426a2738 | 1837 | __iommu_detach_device(domain, dev); |
d72e31c9 AW |
1838 | |
1839 | return 0; | |
1840 | } | |
1841 | ||
e39cb8a3 JR |
1842 | static void __iommu_detach_group(struct iommu_domain *domain, |
1843 | struct iommu_group *group) | |
1844 | { | |
1845 | int ret; | |
1846 | ||
1847 | if (!group->default_domain) { | |
1848 | __iommu_group_for_each_dev(group, domain, | |
1849 | iommu_group_do_detach_device); | |
1850 | group->domain = NULL; | |
1851 | return; | |
1852 | } | |
1853 | ||
1854 | if (group->domain == group->default_domain) | |
1855 | return; | |
1856 | ||
1857 | /* Detach by re-attaching to the default domain */ | |
1858 | ret = __iommu_group_for_each_dev(group, group->default_domain, | |
1859 | iommu_group_do_attach_device); | |
1860 | if (ret != 0) | |
1861 | WARN_ON(1); | |
1862 | else | |
1863 | group->domain = group->default_domain; | |
1864 | } | |
1865 | ||
d72e31c9 AW |
1866 | void iommu_detach_group(struct iommu_domain *domain, struct iommu_group *group) |
1867 | { | |
e39cb8a3 JR |
1868 | mutex_lock(&group->mutex); |
1869 | __iommu_detach_group(domain, group); | |
1870 | mutex_unlock(&group->mutex); | |
d72e31c9 AW |
1871 | } |
1872 | EXPORT_SYMBOL_GPL(iommu_detach_group); | |
1873 | ||
bb5547ac | 1874 | phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova) |
fc2100eb | 1875 | { |
e5aa7f00 JR |
1876 | if (unlikely(domain->ops->iova_to_phys == NULL)) |
1877 | return 0; | |
1878 | ||
1879 | return domain->ops->iova_to_phys(domain, iova); | |
fc2100eb JR |
1880 | } |
1881 | EXPORT_SYMBOL_GPL(iommu_iova_to_phys); | |
dbb9fd86 | 1882 | |
bd13969b AW |
1883 | static size_t iommu_pgsize(struct iommu_domain *domain, |
1884 | unsigned long addr_merge, size_t size) | |
1885 | { | |
1886 | unsigned int pgsize_idx; | |
1887 | size_t pgsize; | |
1888 | ||
1889 | /* Max page size that still fits into 'size' */ | |
1890 | pgsize_idx = __fls(size); | |
1891 | ||
1892 | /* need to consider alignment requirements ? */ | |
1893 | if (likely(addr_merge)) { | |
1894 | /* Max page size allowed by address */ | |
1895 | unsigned int align_pgsize_idx = __ffs(addr_merge); | |
1896 | pgsize_idx = min(pgsize_idx, align_pgsize_idx); | |
1897 | } | |
1898 | ||
1899 | /* build a mask of acceptable page sizes */ | |
1900 | pgsize = (1UL << (pgsize_idx + 1)) - 1; | |
1901 | ||
1902 | /* throw away page sizes not supported by the hardware */ | |
d16e0faa | 1903 | pgsize &= domain->pgsize_bitmap; |
bd13969b AW |
1904 | |
1905 | /* make sure we're still sane */ | |
1906 | BUG_ON(!pgsize); | |
1907 | ||
1908 | /* pick the biggest page */ | |
1909 | pgsize_idx = __fls(pgsize); | |
1910 | pgsize = 1UL << pgsize_idx; | |
1911 | ||
1912 | return pgsize; | |
1913 | } | |
1914 | ||
781ca2de TM |
1915 | int __iommu_map(struct iommu_domain *domain, unsigned long iova, |
1916 | phys_addr_t paddr, size_t size, int prot, gfp_t gfp) | |
cefc53c7 | 1917 | { |
1d7ae53b | 1918 | const struct iommu_ops *ops = domain->ops; |
7d3002cc OBC |
1919 | unsigned long orig_iova = iova; |
1920 | unsigned int min_pagesz; | |
1921 | size_t orig_size = size; | |
06bfcaa9 | 1922 | phys_addr_t orig_paddr = paddr; |
7d3002cc | 1923 | int ret = 0; |
cefc53c7 | 1924 | |
1d7ae53b | 1925 | if (unlikely(ops->map == NULL || |
d16e0faa | 1926 | domain->pgsize_bitmap == 0UL)) |
e5aa7f00 | 1927 | return -ENODEV; |
cefc53c7 | 1928 | |
a10315e5 JR |
1929 | if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING))) |
1930 | return -EINVAL; | |
1931 | ||
7d3002cc | 1932 | /* find out the minimum page size supported */ |
d16e0faa | 1933 | min_pagesz = 1 << __ffs(domain->pgsize_bitmap); |
7d3002cc OBC |
1934 | |
1935 | /* | |
1936 | * both the virtual address and the physical one, as well as | |
1937 | * the size of the mapping, must be aligned (at least) to the | |
1938 | * size of the smallest page supported by the hardware | |
1939 | */ | |
1940 | if (!IS_ALIGNED(iova | paddr | size, min_pagesz)) { | |
abedb049 | 1941 | pr_err("unaligned: iova 0x%lx pa %pa size 0x%zx min_pagesz 0x%x\n", |
6197ca82 | 1942 | iova, &paddr, size, min_pagesz); |
7d3002cc OBC |
1943 | return -EINVAL; |
1944 | } | |
1945 | ||
abedb049 | 1946 | pr_debug("map: iova 0x%lx pa %pa size 0x%zx\n", iova, &paddr, size); |
7d3002cc OBC |
1947 | |
1948 | while (size) { | |
bd13969b | 1949 | size_t pgsize = iommu_pgsize(domain, iova | paddr, size); |
7d3002cc | 1950 | |
abedb049 | 1951 | pr_debug("mapping: iova 0x%lx pa %pa pgsize 0x%zx\n", |
6197ca82 | 1952 | iova, &paddr, pgsize); |
781ca2de | 1953 | ret = ops->map(domain, iova, paddr, pgsize, prot, gfp); |
7d3002cc | 1954 | |
7d3002cc OBC |
1955 | if (ret) |
1956 | break; | |
1957 | ||
1958 | iova += pgsize; | |
1959 | paddr += pgsize; | |
1960 | size -= pgsize; | |
1961 | } | |
1962 | ||
1d7ae53b DO |
1963 | if (ops->iotlb_sync_map) |
1964 | ops->iotlb_sync_map(domain); | |
1965 | ||
7d3002cc OBC |
1966 | /* unroll mapping in case something went wrong */ |
1967 | if (ret) | |
1968 | iommu_unmap(domain, orig_iova, orig_size - size); | |
e0be7c86 | 1969 | else |
06bfcaa9 | 1970 | trace_map(orig_iova, orig_paddr, orig_size); |
7d3002cc OBC |
1971 | |
1972 | return ret; | |
cefc53c7 | 1973 | } |
781ca2de TM |
1974 | |
1975 | int iommu_map(struct iommu_domain *domain, unsigned long iova, | |
1976 | phys_addr_t paddr, size_t size, int prot) | |
1977 | { | |
1978 | might_sleep(); | |
1979 | return __iommu_map(domain, iova, paddr, size, prot, GFP_KERNEL); | |
1980 | } | |
cefc53c7 JR |
1981 | EXPORT_SYMBOL_GPL(iommu_map); |
1982 | ||
781ca2de TM |
1983 | int iommu_map_atomic(struct iommu_domain *domain, unsigned long iova, |
1984 | phys_addr_t paddr, size_t size, int prot) | |
1985 | { | |
1986 | return __iommu_map(domain, iova, paddr, size, prot, GFP_ATOMIC); | |
1987 | } | |
1988 | EXPORT_SYMBOL_GPL(iommu_map_atomic); | |
1989 | ||
add02cfd JR |
1990 | static size_t __iommu_unmap(struct iommu_domain *domain, |
1991 | unsigned long iova, size_t size, | |
a7d20dc1 | 1992 | struct iommu_iotlb_gather *iotlb_gather) |
cefc53c7 | 1993 | { |
add02cfd | 1994 | const struct iommu_ops *ops = domain->ops; |
7d3002cc | 1995 | size_t unmapped_page, unmapped = 0; |
6fd492fd | 1996 | unsigned long orig_iova = iova; |
add02cfd | 1997 | unsigned int min_pagesz; |
cefc53c7 | 1998 | |
add02cfd | 1999 | if (unlikely(ops->unmap == NULL || |
d16e0faa | 2000 | domain->pgsize_bitmap == 0UL)) |
c5611a87 | 2001 | return 0; |
e5aa7f00 | 2002 | |
a10315e5 | 2003 | if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING))) |
c5611a87 | 2004 | return 0; |
a10315e5 | 2005 | |
7d3002cc | 2006 | /* find out the minimum page size supported */ |
d16e0faa | 2007 | min_pagesz = 1 << __ffs(domain->pgsize_bitmap); |
7d3002cc OBC |
2008 | |
2009 | /* | |
2010 | * The virtual address, as well as the size of the mapping, must be | |
2011 | * aligned (at least) to the size of the smallest page supported | |
2012 | * by the hardware | |
2013 | */ | |
2014 | if (!IS_ALIGNED(iova | size, min_pagesz)) { | |
6197ca82 JP |
2015 | pr_err("unaligned: iova 0x%lx size 0x%zx min_pagesz 0x%x\n", |
2016 | iova, size, min_pagesz); | |
c5611a87 | 2017 | return 0; |
7d3002cc OBC |
2018 | } |
2019 | ||
6197ca82 | 2020 | pr_debug("unmap this: iova 0x%lx size 0x%zx\n", iova, size); |
7d3002cc OBC |
2021 | |
2022 | /* | |
2023 | * Keep iterating until we either unmap 'size' bytes (or more) | |
2024 | * or we hit an area that isn't mapped. | |
2025 | */ | |
2026 | while (unmapped < size) { | |
bd13969b | 2027 | size_t pgsize = iommu_pgsize(domain, iova, size - unmapped); |
7d3002cc | 2028 | |
56f8af5e | 2029 | unmapped_page = ops->unmap(domain, iova, pgsize, iotlb_gather); |
7d3002cc OBC |
2030 | if (!unmapped_page) |
2031 | break; | |
2032 | ||
6197ca82 JP |
2033 | pr_debug("unmapped: iova 0x%lx size 0x%zx\n", |
2034 | iova, unmapped_page); | |
7d3002cc OBC |
2035 | |
2036 | iova += unmapped_page; | |
2037 | unmapped += unmapped_page; | |
2038 | } | |
2039 | ||
db8614d3 | 2040 | trace_unmap(orig_iova, size, unmapped); |
7d3002cc | 2041 | return unmapped; |
cefc53c7 | 2042 | } |
add02cfd JR |
2043 | |
2044 | size_t iommu_unmap(struct iommu_domain *domain, | |
2045 | unsigned long iova, size_t size) | |
2046 | { | |
a7d20dc1 WD |
2047 | struct iommu_iotlb_gather iotlb_gather; |
2048 | size_t ret; | |
2049 | ||
2050 | iommu_iotlb_gather_init(&iotlb_gather); | |
2051 | ret = __iommu_unmap(domain, iova, size, &iotlb_gather); | |
2052 | iommu_tlb_sync(domain, &iotlb_gather); | |
2053 | ||
2054 | return ret; | |
add02cfd | 2055 | } |
cefc53c7 | 2056 | EXPORT_SYMBOL_GPL(iommu_unmap); |
1460432c | 2057 | |
add02cfd | 2058 | size_t iommu_unmap_fast(struct iommu_domain *domain, |
a7d20dc1 WD |
2059 | unsigned long iova, size_t size, |
2060 | struct iommu_iotlb_gather *iotlb_gather) | |
add02cfd | 2061 | { |
a7d20dc1 | 2062 | return __iommu_unmap(domain, iova, size, iotlb_gather); |
add02cfd JR |
2063 | } |
2064 | EXPORT_SYMBOL_GPL(iommu_unmap_fast); | |
2065 | ||
781ca2de TM |
2066 | size_t __iommu_map_sg(struct iommu_domain *domain, unsigned long iova, |
2067 | struct scatterlist *sg, unsigned int nents, int prot, | |
2068 | gfp_t gfp) | |
315786eb | 2069 | { |
5d95f40e RM |
2070 | size_t len = 0, mapped = 0; |
2071 | phys_addr_t start; | |
2072 | unsigned int i = 0; | |
38ec010d | 2073 | int ret; |
315786eb | 2074 | |
5d95f40e RM |
2075 | while (i <= nents) { |
2076 | phys_addr_t s_phys = sg_phys(sg); | |
18f23409 | 2077 | |
5d95f40e | 2078 | if (len && s_phys != start + len) { |
781ca2de TM |
2079 | ret = __iommu_map(domain, iova + mapped, start, |
2080 | len, prot, gfp); | |
2081 | ||
5d95f40e RM |
2082 | if (ret) |
2083 | goto out_err; | |
18f23409 | 2084 | |
5d95f40e RM |
2085 | mapped += len; |
2086 | len = 0; | |
2087 | } | |
38ec010d | 2088 | |
5d95f40e RM |
2089 | if (len) { |
2090 | len += sg->length; | |
2091 | } else { | |
2092 | len = sg->length; | |
2093 | start = s_phys; | |
2094 | } | |
38ec010d | 2095 | |
5d95f40e RM |
2096 | if (++i < nents) |
2097 | sg = sg_next(sg); | |
315786eb OH |
2098 | } |
2099 | ||
2100 | return mapped; | |
38ec010d JR |
2101 | |
2102 | out_err: | |
2103 | /* undo mappings already done */ | |
2104 | iommu_unmap(domain, iova, mapped); | |
2105 | ||
2106 | return 0; | |
2107 | ||
315786eb | 2108 | } |
781ca2de TM |
2109 | |
2110 | size_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova, | |
2111 | struct scatterlist *sg, unsigned int nents, int prot) | |
2112 | { | |
2113 | might_sleep(); | |
2114 | return __iommu_map_sg(domain, iova, sg, nents, prot, GFP_KERNEL); | |
2115 | } | |
d88e61fa | 2116 | EXPORT_SYMBOL_GPL(iommu_map_sg); |
d7787d57 | 2117 | |
781ca2de TM |
2118 | size_t iommu_map_sg_atomic(struct iommu_domain *domain, unsigned long iova, |
2119 | struct scatterlist *sg, unsigned int nents, int prot) | |
2120 | { | |
2121 | return __iommu_map_sg(domain, iova, sg, nents, prot, GFP_ATOMIC); | |
2122 | } | |
2123 | EXPORT_SYMBOL_GPL(iommu_map_sg_atomic); | |
2124 | ||
d7787d57 | 2125 | int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr, |
80f97f0f | 2126 | phys_addr_t paddr, u64 size, int prot) |
d7787d57 JR |
2127 | { |
2128 | if (unlikely(domain->ops->domain_window_enable == NULL)) | |
2129 | return -ENODEV; | |
2130 | ||
80f97f0f VS |
2131 | return domain->ops->domain_window_enable(domain, wnd_nr, paddr, size, |
2132 | prot); | |
d7787d57 JR |
2133 | } |
2134 | EXPORT_SYMBOL_GPL(iommu_domain_window_enable); | |
2135 | ||
2136 | void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr) | |
2137 | { | |
2138 | if (unlikely(domain->ops->domain_window_disable == NULL)) | |
2139 | return; | |
2140 | ||
2141 | return domain->ops->domain_window_disable(domain, wnd_nr); | |
2142 | } | |
2143 | EXPORT_SYMBOL_GPL(iommu_domain_window_disable); | |
2144 | ||
207c6e36 JR |
2145 | /** |
2146 | * report_iommu_fault() - report about an IOMMU fault to the IOMMU framework | |
2147 | * @domain: the iommu domain where the fault has happened | |
2148 | * @dev: the device where the fault has happened | |
2149 | * @iova: the faulting address | |
2150 | * @flags: mmu fault flags (e.g. IOMMU_FAULT_READ/IOMMU_FAULT_WRITE/...) | |
2151 | * | |
2152 | * This function should be called by the low-level IOMMU implementations | |
2153 | * whenever IOMMU faults happen, to allow high-level users, that are | |
2154 | * interested in such events, to know about them. | |
2155 | * | |
2156 | * This event may be useful for several possible use cases: | |
2157 | * - mere logging of the event | |
2158 | * - dynamic TLB/PTE loading | |
2159 | * - if restarting of the faulting device is required | |
2160 | * | |
2161 | * Returns 0 on success and an appropriate error code otherwise (if dynamic | |
2162 | * PTE/TLB loading will one day be supported, implementations will be able | |
2163 | * to tell whether it succeeded or not according to this return value). | |
2164 | * | |
2165 | * Specifically, -ENOSYS is returned if a fault handler isn't installed | |
2166 | * (though fault handlers can also return -ENOSYS, in case they want to | |
2167 | * elicit the default behavior of the IOMMU drivers). | |
2168 | */ | |
2169 | int report_iommu_fault(struct iommu_domain *domain, struct device *dev, | |
2170 | unsigned long iova, int flags) | |
2171 | { | |
2172 | int ret = -ENOSYS; | |
2173 | ||
2174 | /* | |
2175 | * if upper layers showed interest and installed a fault handler, | |
2176 | * invoke it. | |
2177 | */ | |
2178 | if (domain->handler) | |
2179 | ret = domain->handler(domain, dev, iova, flags, | |
2180 | domain->handler_token); | |
2181 | ||
2182 | trace_io_page_fault(dev, iova, flags); | |
2183 | return ret; | |
2184 | } | |
2185 | EXPORT_SYMBOL_GPL(report_iommu_fault); | |
2186 | ||
d72e31c9 | 2187 | static int __init iommu_init(void) |
1460432c | 2188 | { |
d72e31c9 AW |
2189 | iommu_group_kset = kset_create_and_add("iommu_groups", |
2190 | NULL, kernel_kobj); | |
d72e31c9 AW |
2191 | BUG_ON(!iommu_group_kset); |
2192 | ||
bad614b2 GH |
2193 | iommu_debugfs_setup(); |
2194 | ||
d72e31c9 | 2195 | return 0; |
1460432c | 2196 | } |
d7ef9995 | 2197 | core_initcall(iommu_init); |
0cd76dd1 JR |
2198 | |
2199 | int iommu_domain_get_attr(struct iommu_domain *domain, | |
2200 | enum iommu_attr attr, void *data) | |
2201 | { | |
0ff64f80 | 2202 | struct iommu_domain_geometry *geometry; |
d2e12160 | 2203 | bool *paging; |
0ff64f80 JR |
2204 | int ret = 0; |
2205 | ||
2206 | switch (attr) { | |
2207 | case DOMAIN_ATTR_GEOMETRY: | |
2208 | geometry = data; | |
2209 | *geometry = domain->geometry; | |
2210 | ||
d2e12160 JR |
2211 | break; |
2212 | case DOMAIN_ATTR_PAGING: | |
2213 | paging = data; | |
d16e0faa | 2214 | *paging = (domain->pgsize_bitmap != 0UL); |
0ff64f80 JR |
2215 | break; |
2216 | default: | |
2217 | if (!domain->ops->domain_get_attr) | |
2218 | return -EINVAL; | |
0cd76dd1 | 2219 | |
0ff64f80 JR |
2220 | ret = domain->ops->domain_get_attr(domain, attr, data); |
2221 | } | |
2222 | ||
2223 | return ret; | |
0cd76dd1 JR |
2224 | } |
2225 | EXPORT_SYMBOL_GPL(iommu_domain_get_attr); | |
2226 | ||
2227 | int iommu_domain_set_attr(struct iommu_domain *domain, | |
2228 | enum iommu_attr attr, void *data) | |
2229 | { | |
69356712 | 2230 | int ret = 0; |
69356712 JR |
2231 | |
2232 | switch (attr) { | |
69356712 JR |
2233 | default: |
2234 | if (domain->ops->domain_set_attr == NULL) | |
2235 | return -EINVAL; | |
2236 | ||
2237 | ret = domain->ops->domain_set_attr(domain, attr, data); | |
2238 | } | |
2239 | ||
2240 | return ret; | |
1460432c | 2241 | } |
0cd76dd1 | 2242 | EXPORT_SYMBOL_GPL(iommu_domain_set_attr); |
a1015c2b | 2243 | |
e5b5234a | 2244 | void iommu_get_resv_regions(struct device *dev, struct list_head *list) |
a1015c2b JR |
2245 | { |
2246 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
2247 | ||
e5b5234a EA |
2248 | if (ops && ops->get_resv_regions) |
2249 | ops->get_resv_regions(dev, list); | |
a1015c2b JR |
2250 | } |
2251 | ||
e5b5234a | 2252 | void iommu_put_resv_regions(struct device *dev, struct list_head *list) |
a1015c2b JR |
2253 | { |
2254 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
2255 | ||
e5b5234a EA |
2256 | if (ops && ops->put_resv_regions) |
2257 | ops->put_resv_regions(dev, list); | |
a1015c2b | 2258 | } |
d290f1e7 | 2259 | |
f9f6971e TR |
2260 | /** |
2261 | * generic_iommu_put_resv_regions - Reserved region driver helper | |
2262 | * @dev: device for which to free reserved regions | |
2263 | * @list: reserved region list for device | |
2264 | * | |
2265 | * IOMMU drivers can use this to implement their .put_resv_regions() callback | |
2266 | * for simple reservations. Memory allocated for each reserved region will be | |
2267 | * freed. If an IOMMU driver allocates additional resources per region, it is | |
2268 | * going to have to implement a custom callback. | |
2269 | */ | |
2270 | void generic_iommu_put_resv_regions(struct device *dev, struct list_head *list) | |
2271 | { | |
2272 | struct iommu_resv_region *entry, *next; | |
2273 | ||
2274 | list_for_each_entry_safe(entry, next, list, list) | |
2275 | kfree(entry); | |
2276 | } | |
2277 | EXPORT_SYMBOL(generic_iommu_put_resv_regions); | |
2278 | ||
2b20cbba | 2279 | struct iommu_resv_region *iommu_alloc_resv_region(phys_addr_t start, |
9d3a4de4 RM |
2280 | size_t length, int prot, |
2281 | enum iommu_resv_type type) | |
2b20cbba EA |
2282 | { |
2283 | struct iommu_resv_region *region; | |
2284 | ||
2285 | region = kzalloc(sizeof(*region), GFP_KERNEL); | |
2286 | if (!region) | |
2287 | return NULL; | |
2288 | ||
2289 | INIT_LIST_HEAD(®ion->list); | |
2290 | region->start = start; | |
2291 | region->length = length; | |
2292 | region->prot = prot; | |
2293 | region->type = type; | |
2294 | return region; | |
a1015c2b | 2295 | } |
a7ba5c3d | 2296 | EXPORT_SYMBOL_GPL(iommu_alloc_resv_region); |
d290f1e7 | 2297 | |
7423e017 LB |
2298 | static int |
2299 | request_default_domain_for_dev(struct device *dev, unsigned long type) | |
d290f1e7 | 2300 | { |
7423e017 | 2301 | struct iommu_domain *domain; |
d290f1e7 JR |
2302 | struct iommu_group *group; |
2303 | int ret; | |
2304 | ||
2305 | /* Device must already be in a group before calling this function */ | |
57274ea2 LB |
2306 | group = iommu_group_get(dev); |
2307 | if (!group) | |
2308 | return -EINVAL; | |
d290f1e7 JR |
2309 | |
2310 | mutex_lock(&group->mutex); | |
2311 | ||
d290f1e7 | 2312 | ret = 0; |
7423e017 | 2313 | if (group->default_domain && group->default_domain->type == type) |
d290f1e7 JR |
2314 | goto out; |
2315 | ||
2316 | /* Don't change mappings of existing devices */ | |
2317 | ret = -EBUSY; | |
2318 | if (iommu_group_device_count(group) != 1) | |
2319 | goto out; | |
2320 | ||
d290f1e7 | 2321 | ret = -ENOMEM; |
7423e017 LB |
2322 | domain = __iommu_domain_alloc(dev->bus, type); |
2323 | if (!domain) | |
d290f1e7 JR |
2324 | goto out; |
2325 | ||
2326 | /* Attach the device to the domain */ | |
7423e017 | 2327 | ret = __iommu_attach_group(domain, group); |
d290f1e7 | 2328 | if (ret) { |
7423e017 | 2329 | iommu_domain_free(domain); |
d290f1e7 JR |
2330 | goto out; |
2331 | } | |
2332 | ||
d127bc9b | 2333 | /* Make the domain the default for this group */ |
d290f1e7 JR |
2334 | if (group->default_domain) |
2335 | iommu_domain_free(group->default_domain); | |
7423e017 | 2336 | group->default_domain = domain; |
d290f1e7 | 2337 | |
d3602115 JS |
2338 | iommu_group_create_direct_mappings(group, dev); |
2339 | ||
7423e017 LB |
2340 | dev_info(dev, "Using iommu %s mapping\n", |
2341 | type == IOMMU_DOMAIN_DMA ? "dma" : "direct"); | |
d290f1e7 JR |
2342 | |
2343 | ret = 0; | |
2344 | out: | |
2345 | mutex_unlock(&group->mutex); | |
2346 | iommu_group_put(group); | |
2347 | ||
2348 | return ret; | |
2349 | } | |
57f98d2f | 2350 | |
7423e017 LB |
2351 | /* Request that a device is direct mapped by the IOMMU */ |
2352 | int iommu_request_dm_for_dev(struct device *dev) | |
2353 | { | |
2354 | return request_default_domain_for_dev(dev, IOMMU_DOMAIN_IDENTITY); | |
2355 | } | |
2356 | ||
2357 | /* Request that a device can't be direct mapped by the IOMMU */ | |
2358 | int iommu_request_dma_domain_for_dev(struct device *dev) | |
2359 | { | |
2360 | return request_default_domain_for_dev(dev, IOMMU_DOMAIN_DMA); | |
2361 | } | |
2362 | ||
8a69961c JR |
2363 | void iommu_set_default_passthrough(bool cmd_line) |
2364 | { | |
2365 | if (cmd_line) | |
2366 | iommu_set_cmd_line_dma_api(); | |
2367 | ||
2368 | iommu_def_domain_type = IOMMU_DOMAIN_IDENTITY; | |
2369 | } | |
2370 | ||
2371 | void iommu_set_default_translated(bool cmd_line) | |
2372 | { | |
2373 | if (cmd_line) | |
2374 | iommu_set_cmd_line_dma_api(); | |
2375 | ||
2376 | iommu_def_domain_type = IOMMU_DOMAIN_DMA; | |
2377 | } | |
2378 | ||
2379 | bool iommu_default_passthrough(void) | |
2380 | { | |
2381 | return iommu_def_domain_type == IOMMU_DOMAIN_IDENTITY; | |
2382 | } | |
2383 | EXPORT_SYMBOL_GPL(iommu_default_passthrough); | |
2384 | ||
534766df | 2385 | const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode) |
e4f10ffe | 2386 | { |
e4f10ffe | 2387 | const struct iommu_ops *ops = NULL; |
d0f6f583 | 2388 | struct iommu_device *iommu; |
e4f10ffe | 2389 | |
d0f6f583 JR |
2390 | spin_lock(&iommu_device_lock); |
2391 | list_for_each_entry(iommu, &iommu_device_list, list) | |
2392 | if (iommu->fwnode == fwnode) { | |
2393 | ops = iommu->ops; | |
e4f10ffe LP |
2394 | break; |
2395 | } | |
d0f6f583 | 2396 | spin_unlock(&iommu_device_lock); |
e4f10ffe LP |
2397 | return ops; |
2398 | } | |
2399 | ||
57f98d2f RM |
2400 | int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode, |
2401 | const struct iommu_ops *ops) | |
2402 | { | |
b4ef725e | 2403 | struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); |
57f98d2f RM |
2404 | |
2405 | if (fwspec) | |
2406 | return ops == fwspec->ops ? 0 : -EINVAL; | |
2407 | ||
2408 | fwspec = kzalloc(sizeof(*fwspec), GFP_KERNEL); | |
2409 | if (!fwspec) | |
2410 | return -ENOMEM; | |
2411 | ||
2412 | of_node_get(to_of_node(iommu_fwnode)); | |
2413 | fwspec->iommu_fwnode = iommu_fwnode; | |
2414 | fwspec->ops = ops; | |
b4ef725e | 2415 | dev_iommu_fwspec_set(dev, fwspec); |
57f98d2f RM |
2416 | return 0; |
2417 | } | |
2418 | EXPORT_SYMBOL_GPL(iommu_fwspec_init); | |
2419 | ||
2420 | void iommu_fwspec_free(struct device *dev) | |
2421 | { | |
b4ef725e | 2422 | struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); |
57f98d2f RM |
2423 | |
2424 | if (fwspec) { | |
2425 | fwnode_handle_put(fwspec->iommu_fwnode); | |
2426 | kfree(fwspec); | |
b4ef725e | 2427 | dev_iommu_fwspec_set(dev, NULL); |
57f98d2f RM |
2428 | } |
2429 | } | |
2430 | EXPORT_SYMBOL_GPL(iommu_fwspec_free); | |
2431 | ||
2432 | int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids) | |
2433 | { | |
b4ef725e | 2434 | struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); |
57f98d2f RM |
2435 | size_t size; |
2436 | int i; | |
2437 | ||
2438 | if (!fwspec) | |
2439 | return -EINVAL; | |
2440 | ||
2441 | size = offsetof(struct iommu_fwspec, ids[fwspec->num_ids + num_ids]); | |
2442 | if (size > sizeof(*fwspec)) { | |
b4ef725e | 2443 | fwspec = krealloc(fwspec, size, GFP_KERNEL); |
57f98d2f RM |
2444 | if (!fwspec) |
2445 | return -ENOMEM; | |
909111ba | 2446 | |
b4ef725e | 2447 | dev_iommu_fwspec_set(dev, fwspec); |
57f98d2f RM |
2448 | } |
2449 | ||
2450 | for (i = 0; i < num_ids; i++) | |
2451 | fwspec->ids[fwspec->num_ids + i] = ids[i]; | |
2452 | ||
2453 | fwspec->num_ids += num_ids; | |
57f98d2f RM |
2454 | return 0; |
2455 | } | |
2456 | EXPORT_SYMBOL_GPL(iommu_fwspec_add_ids); | |
a3a19592 LB |
2457 | |
2458 | /* | |
2459 | * Per device IOMMU features. | |
2460 | */ | |
2461 | bool iommu_dev_has_feature(struct device *dev, enum iommu_dev_features feat) | |
2462 | { | |
2463 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
2464 | ||
2465 | if (ops && ops->dev_has_feat) | |
2466 | return ops->dev_has_feat(dev, feat); | |
2467 | ||
2468 | return false; | |
2469 | } | |
2470 | EXPORT_SYMBOL_GPL(iommu_dev_has_feature); | |
2471 | ||
2472 | int iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features feat) | |
2473 | { | |
2474 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
2475 | ||
2476 | if (ops && ops->dev_enable_feat) | |
2477 | return ops->dev_enable_feat(dev, feat); | |
2478 | ||
2479 | return -ENODEV; | |
2480 | } | |
2481 | EXPORT_SYMBOL_GPL(iommu_dev_enable_feature); | |
2482 | ||
2483 | /* | |
2484 | * The device drivers should do the necessary cleanups before calling this. | |
2485 | * For example, before disabling the aux-domain feature, the device driver | |
2486 | * should detach all aux-domains. Otherwise, this will return -EBUSY. | |
2487 | */ | |
2488 | int iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features feat) | |
2489 | { | |
2490 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
2491 | ||
2492 | if (ops && ops->dev_disable_feat) | |
2493 | return ops->dev_disable_feat(dev, feat); | |
2494 | ||
2495 | return -EBUSY; | |
2496 | } | |
2497 | EXPORT_SYMBOL_GPL(iommu_dev_disable_feature); | |
2498 | ||
2499 | bool iommu_dev_feature_enabled(struct device *dev, enum iommu_dev_features feat) | |
2500 | { | |
2501 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
2502 | ||
2503 | if (ops && ops->dev_feat_enabled) | |
2504 | return ops->dev_feat_enabled(dev, feat); | |
2505 | ||
2506 | return false; | |
2507 | } | |
2508 | EXPORT_SYMBOL_GPL(iommu_dev_feature_enabled); | |
2509 | ||
2510 | /* | |
2511 | * Aux-domain specific attach/detach. | |
2512 | * | |
2513 | * Only works if iommu_dev_feature_enabled(dev, IOMMU_DEV_FEAT_AUX) returns | |
2514 | * true. Also, as long as domains are attached to a device through this | |
2515 | * interface, any tries to call iommu_attach_device() should fail | |
2516 | * (iommu_detach_device() can't fail, so we fail when trying to re-attach). | |
2517 | * This should make us safe against a device being attached to a guest as a | |
2518 | * whole while there are still pasid users on it (aux and sva). | |
2519 | */ | |
2520 | int iommu_aux_attach_device(struct iommu_domain *domain, struct device *dev) | |
2521 | { | |
2522 | int ret = -ENODEV; | |
2523 | ||
2524 | if (domain->ops->aux_attach_dev) | |
2525 | ret = domain->ops->aux_attach_dev(domain, dev); | |
2526 | ||
2527 | if (!ret) | |
2528 | trace_attach_device_to_domain(dev); | |
2529 | ||
2530 | return ret; | |
2531 | } | |
2532 | EXPORT_SYMBOL_GPL(iommu_aux_attach_device); | |
2533 | ||
2534 | void iommu_aux_detach_device(struct iommu_domain *domain, struct device *dev) | |
2535 | { | |
2536 | if (domain->ops->aux_detach_dev) { | |
2537 | domain->ops->aux_detach_dev(domain, dev); | |
2538 | trace_detach_device_from_domain(dev); | |
2539 | } | |
2540 | } | |
2541 | EXPORT_SYMBOL_GPL(iommu_aux_detach_device); | |
2542 | ||
2543 | int iommu_aux_get_pasid(struct iommu_domain *domain, struct device *dev) | |
2544 | { | |
2545 | int ret = -ENODEV; | |
2546 | ||
2547 | if (domain->ops->aux_get_pasid) | |
2548 | ret = domain->ops->aux_get_pasid(domain, dev); | |
2549 | ||
2550 | return ret; | |
2551 | } | |
2552 | EXPORT_SYMBOL_GPL(iommu_aux_get_pasid); | |
26b25a2b JPB |
2553 | |
2554 | /** | |
2555 | * iommu_sva_bind_device() - Bind a process address space to a device | |
2556 | * @dev: the device | |
2557 | * @mm: the mm to bind, caller must hold a reference to it | |
2558 | * | |
2559 | * Create a bond between device and address space, allowing the device to access | |
2560 | * the mm using the returned PASID. If a bond already exists between @device and | |
2561 | * @mm, it is returned and an additional reference is taken. Caller must call | |
2562 | * iommu_sva_unbind_device() to release each reference. | |
2563 | * | |
2564 | * iommu_dev_enable_feature(dev, IOMMU_DEV_FEAT_SVA) must be called first, to | |
2565 | * initialize the required SVA features. | |
2566 | * | |
2567 | * On error, returns an ERR_PTR value. | |
2568 | */ | |
2569 | struct iommu_sva * | |
2570 | iommu_sva_bind_device(struct device *dev, struct mm_struct *mm, void *drvdata) | |
2571 | { | |
2572 | struct iommu_group *group; | |
2573 | struct iommu_sva *handle = ERR_PTR(-EINVAL); | |
2574 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
2575 | ||
2576 | if (!ops || !ops->sva_bind) | |
2577 | return ERR_PTR(-ENODEV); | |
2578 | ||
2579 | group = iommu_group_get(dev); | |
2580 | if (!group) | |
2581 | return ERR_PTR(-ENODEV); | |
2582 | ||
2583 | /* Ensure device count and domain don't change while we're binding */ | |
2584 | mutex_lock(&group->mutex); | |
2585 | ||
2586 | /* | |
2587 | * To keep things simple, SVA currently doesn't support IOMMU groups | |
2588 | * with more than one device. Existing SVA-capable systems are not | |
2589 | * affected by the problems that required IOMMU groups (lack of ACS | |
2590 | * isolation, device ID aliasing and other hardware issues). | |
2591 | */ | |
2592 | if (iommu_group_device_count(group) != 1) | |
2593 | goto out_unlock; | |
2594 | ||
2595 | handle = ops->sva_bind(dev, mm, drvdata); | |
2596 | ||
2597 | out_unlock: | |
2598 | mutex_unlock(&group->mutex); | |
2599 | iommu_group_put(group); | |
2600 | ||
2601 | return handle; | |
2602 | } | |
2603 | EXPORT_SYMBOL_GPL(iommu_sva_bind_device); | |
2604 | ||
2605 | /** | |
2606 | * iommu_sva_unbind_device() - Remove a bond created with iommu_sva_bind_device | |
2607 | * @handle: the handle returned by iommu_sva_bind_device() | |
2608 | * | |
2609 | * Put reference to a bond between device and address space. The device should | |
2610 | * not be issuing any more transaction for this PASID. All outstanding page | |
2611 | * requests for this PASID must have been flushed to the IOMMU. | |
2612 | * | |
2613 | * Returns 0 on success, or an error value | |
2614 | */ | |
2615 | void iommu_sva_unbind_device(struct iommu_sva *handle) | |
2616 | { | |
2617 | struct iommu_group *group; | |
2618 | struct device *dev = handle->dev; | |
2619 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
2620 | ||
2621 | if (!ops || !ops->sva_unbind) | |
2622 | return; | |
2623 | ||
2624 | group = iommu_group_get(dev); | |
2625 | if (!group) | |
2626 | return; | |
2627 | ||
2628 | mutex_lock(&group->mutex); | |
2629 | ops->sva_unbind(handle); | |
2630 | mutex_unlock(&group->mutex); | |
2631 | ||
2632 | iommu_group_put(group); | |
2633 | } | |
2634 | EXPORT_SYMBOL_GPL(iommu_sva_unbind_device); | |
2635 | ||
2636 | int iommu_sva_set_ops(struct iommu_sva *handle, | |
2637 | const struct iommu_sva_ops *sva_ops) | |
2638 | { | |
2639 | if (handle->ops && handle->ops != sva_ops) | |
2640 | return -EEXIST; | |
2641 | ||
2642 | handle->ops = sva_ops; | |
2643 | return 0; | |
2644 | } | |
2645 | EXPORT_SYMBOL_GPL(iommu_sva_set_ops); | |
2646 | ||
2647 | int iommu_sva_get_pasid(struct iommu_sva *handle) | |
2648 | { | |
2649 | const struct iommu_ops *ops = handle->dev->bus->iommu_ops; | |
2650 | ||
2651 | if (!ops || !ops->sva_get_pasid) | |
2652 | return IOMMU_PASID_INVALID; | |
2653 | ||
2654 | return ops->sva_get_pasid(handle); | |
2655 | } | |
2656 | EXPORT_SYMBOL_GPL(iommu_sva_get_pasid); |