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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 | |
045a7042 | 155 | static struct dev_iommu *dev_iommu_get(struct device *dev) |
0c830e6b | 156 | { |
045a7042 | 157 | struct dev_iommu *param = dev->iommu; |
0c830e6b JP |
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); | |
045a7042 | 167 | dev->iommu = param; |
0c830e6b JP |
168 | return param; |
169 | } | |
170 | ||
045a7042 | 171 | static void dev_iommu_free(struct device *dev) |
0c830e6b | 172 | { |
5375e874 | 173 | iommu_fwspec_free(dev); |
045a7042 JR |
174 | kfree(dev->iommu); |
175 | dev->iommu = NULL; | |
0c830e6b JP |
176 | } |
177 | ||
cc5aed44 JR |
178 | int iommu_probe_device(struct device *dev) |
179 | { | |
180 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
0c830e6b | 181 | int ret; |
cc5aed44 JR |
182 | |
183 | WARN_ON(dev->iommu_group); | |
0c830e6b JP |
184 | if (!ops) |
185 | return -EINVAL; | |
cc5aed44 | 186 | |
045a7042 | 187 | if (!dev_iommu_get(dev)) |
0c830e6b | 188 | return -ENOMEM; |
cc5aed44 | 189 | |
25f003de WD |
190 | if (!try_module_get(ops->owner)) { |
191 | ret = -EINVAL; | |
192 | goto err_free_dev_param; | |
193 | } | |
194 | ||
0c830e6b JP |
195 | ret = ops->add_device(dev); |
196 | if (ret) | |
25f003de WD |
197 | goto err_module_put; |
198 | ||
199 | return 0; | |
dc9de8a2 | 200 | |
25f003de WD |
201 | err_module_put: |
202 | module_put(ops->owner); | |
203 | err_free_dev_param: | |
045a7042 | 204 | dev_iommu_free(dev); |
dc9de8a2 | 205 | return ret; |
cc5aed44 JR |
206 | } |
207 | ||
208 | void iommu_release_device(struct device *dev) | |
209 | { | |
210 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
211 | ||
212 | if (dev->iommu_group) | |
213 | ops->remove_device(dev); | |
0c830e6b | 214 | |
045a7042 | 215 | if (dev->iommu) { |
25f003de | 216 | module_put(ops->owner); |
045a7042 | 217 | dev_iommu_free(dev); |
25f003de | 218 | } |
cc5aed44 JR |
219 | } |
220 | ||
53723dc5 JR |
221 | static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus, |
222 | unsigned type); | |
e39cb8a3 JR |
223 | static int __iommu_attach_device(struct iommu_domain *domain, |
224 | struct device *dev); | |
225 | static int __iommu_attach_group(struct iommu_domain *domain, | |
226 | struct iommu_group *group); | |
227 | static void __iommu_detach_group(struct iommu_domain *domain, | |
228 | struct iommu_group *group); | |
53723dc5 | 229 | |
fccb4e3b WD |
230 | static int __init iommu_set_def_domain_type(char *str) |
231 | { | |
232 | bool pt; | |
7f9584df | 233 | int ret; |
fccb4e3b | 234 | |
7f9584df AS |
235 | ret = kstrtobool(str, &pt); |
236 | if (ret) | |
237 | return ret; | |
fccb4e3b | 238 | |
adab0b07 JR |
239 | if (pt) |
240 | iommu_set_default_passthrough(true); | |
241 | else | |
242 | iommu_set_default_translated(true); | |
faf14989 | 243 | |
fccb4e3b WD |
244 | return 0; |
245 | } | |
246 | early_param("iommu.passthrough", iommu_set_def_domain_type); | |
247 | ||
68a6efe8 ZL |
248 | static int __init iommu_dma_setup(char *str) |
249 | { | |
250 | return kstrtobool(str, &iommu_dma_strict); | |
251 | } | |
252 | early_param("iommu.strict", iommu_dma_setup); | |
253 | ||
d72e31c9 AW |
254 | static ssize_t iommu_group_attr_show(struct kobject *kobj, |
255 | struct attribute *__attr, char *buf) | |
1460432c | 256 | { |
d72e31c9 AW |
257 | struct iommu_group_attribute *attr = to_iommu_group_attr(__attr); |
258 | struct iommu_group *group = to_iommu_group(kobj); | |
259 | ssize_t ret = -EIO; | |
1460432c | 260 | |
d72e31c9 AW |
261 | if (attr->show) |
262 | ret = attr->show(group, buf); | |
263 | return ret; | |
264 | } | |
265 | ||
266 | static ssize_t iommu_group_attr_store(struct kobject *kobj, | |
267 | struct attribute *__attr, | |
268 | const char *buf, size_t count) | |
269 | { | |
270 | struct iommu_group_attribute *attr = to_iommu_group_attr(__attr); | |
271 | struct iommu_group *group = to_iommu_group(kobj); | |
272 | ssize_t ret = -EIO; | |
1460432c | 273 | |
d72e31c9 AW |
274 | if (attr->store) |
275 | ret = attr->store(group, buf, count); | |
276 | return ret; | |
1460432c | 277 | } |
1460432c | 278 | |
d72e31c9 AW |
279 | static const struct sysfs_ops iommu_group_sysfs_ops = { |
280 | .show = iommu_group_attr_show, | |
281 | .store = iommu_group_attr_store, | |
282 | }; | |
1460432c | 283 | |
d72e31c9 AW |
284 | static int iommu_group_create_file(struct iommu_group *group, |
285 | struct iommu_group_attribute *attr) | |
286 | { | |
287 | return sysfs_create_file(&group->kobj, &attr->attr); | |
1460432c | 288 | } |
1460432c | 289 | |
d72e31c9 AW |
290 | static void iommu_group_remove_file(struct iommu_group *group, |
291 | struct iommu_group_attribute *attr) | |
292 | { | |
293 | sysfs_remove_file(&group->kobj, &attr->attr); | |
294 | } | |
295 | ||
296 | static ssize_t iommu_group_show_name(struct iommu_group *group, char *buf) | |
297 | { | |
298 | return sprintf(buf, "%s\n", group->name); | |
299 | } | |
300 | ||
6c65fb31 EA |
301 | /** |
302 | * iommu_insert_resv_region - Insert a new region in the | |
303 | * list of reserved regions. | |
304 | * @new: new region to insert | |
305 | * @regions: list of regions | |
306 | * | |
4dbd258f EA |
307 | * Elements are sorted by start address and overlapping segments |
308 | * of the same type are merged. | |
6c65fb31 | 309 | */ |
4dbd258f EA |
310 | int iommu_insert_resv_region(struct iommu_resv_region *new, |
311 | struct list_head *regions) | |
6c65fb31 | 312 | { |
4dbd258f EA |
313 | struct iommu_resv_region *iter, *tmp, *nr, *top; |
314 | LIST_HEAD(stack); | |
315 | ||
316 | nr = iommu_alloc_resv_region(new->start, new->length, | |
317 | new->prot, new->type); | |
318 | if (!nr) | |
319 | return -ENOMEM; | |
320 | ||
321 | /* First add the new element based on start address sorting */ | |
322 | list_for_each_entry(iter, regions, list) { | |
323 | if (nr->start < iter->start || | |
324 | (nr->start == iter->start && nr->type <= iter->type)) | |
325 | break; | |
326 | } | |
327 | list_add_tail(&nr->list, &iter->list); | |
328 | ||
329 | /* Merge overlapping segments of type nr->type in @regions, if any */ | |
330 | list_for_each_entry_safe(iter, tmp, regions, list) { | |
331 | phys_addr_t top_end, iter_end = iter->start + iter->length - 1; | |
332 | ||
4c80ba39 EA |
333 | /* no merge needed on elements of different types than @new */ |
334 | if (iter->type != new->type) { | |
4dbd258f EA |
335 | list_move_tail(&iter->list, &stack); |
336 | continue; | |
337 | } | |
338 | ||
339 | /* look for the last stack element of same type as @iter */ | |
340 | list_for_each_entry_reverse(top, &stack, list) | |
341 | if (top->type == iter->type) | |
342 | goto check_overlap; | |
343 | ||
344 | list_move_tail(&iter->list, &stack); | |
345 | continue; | |
346 | ||
347 | check_overlap: | |
348 | top_end = top->start + top->length - 1; | |
349 | ||
350 | if (iter->start > top_end + 1) { | |
351 | list_move_tail(&iter->list, &stack); | |
6c65fb31 | 352 | } else { |
4dbd258f EA |
353 | top->length = max(top_end, iter_end) - top->start + 1; |
354 | list_del(&iter->list); | |
355 | kfree(iter); | |
6c65fb31 EA |
356 | } |
357 | } | |
4dbd258f | 358 | list_splice(&stack, regions); |
6c65fb31 EA |
359 | return 0; |
360 | } | |
361 | ||
362 | static int | |
363 | iommu_insert_device_resv_regions(struct list_head *dev_resv_regions, | |
364 | struct list_head *group_resv_regions) | |
365 | { | |
366 | struct iommu_resv_region *entry; | |
a514a6e2 | 367 | int ret = 0; |
6c65fb31 EA |
368 | |
369 | list_for_each_entry(entry, dev_resv_regions, list) { | |
370 | ret = iommu_insert_resv_region(entry, group_resv_regions); | |
371 | if (ret) | |
372 | break; | |
373 | } | |
374 | return ret; | |
375 | } | |
376 | ||
377 | int iommu_get_group_resv_regions(struct iommu_group *group, | |
378 | struct list_head *head) | |
379 | { | |
8d2932dd | 380 | struct group_device *device; |
6c65fb31 EA |
381 | int ret = 0; |
382 | ||
383 | mutex_lock(&group->mutex); | |
384 | list_for_each_entry(device, &group->devices, list) { | |
385 | struct list_head dev_resv_regions; | |
386 | ||
387 | INIT_LIST_HEAD(&dev_resv_regions); | |
388 | iommu_get_resv_regions(device->dev, &dev_resv_regions); | |
389 | ret = iommu_insert_device_resv_regions(&dev_resv_regions, head); | |
390 | iommu_put_resv_regions(device->dev, &dev_resv_regions); | |
391 | if (ret) | |
392 | break; | |
393 | } | |
394 | mutex_unlock(&group->mutex); | |
395 | return ret; | |
396 | } | |
397 | EXPORT_SYMBOL_GPL(iommu_get_group_resv_regions); | |
398 | ||
bc7d12b9 EA |
399 | static ssize_t iommu_group_show_resv_regions(struct iommu_group *group, |
400 | char *buf) | |
401 | { | |
402 | struct iommu_resv_region *region, *next; | |
403 | struct list_head group_resv_regions; | |
404 | char *str = buf; | |
405 | ||
406 | INIT_LIST_HEAD(&group_resv_regions); | |
407 | iommu_get_group_resv_regions(group, &group_resv_regions); | |
408 | ||
409 | list_for_each_entry_safe(region, next, &group_resv_regions, list) { | |
410 | str += sprintf(str, "0x%016llx 0x%016llx %s\n", | |
411 | (long long int)region->start, | |
412 | (long long int)(region->start + | |
413 | region->length - 1), | |
414 | iommu_group_resv_type_string[region->type]); | |
415 | kfree(region); | |
416 | } | |
417 | ||
418 | return (str - buf); | |
419 | } | |
420 | ||
c52c72d3 OJ |
421 | static ssize_t iommu_group_show_type(struct iommu_group *group, |
422 | char *buf) | |
423 | { | |
424 | char *type = "unknown\n"; | |
425 | ||
426 | if (group->default_domain) { | |
427 | switch (group->default_domain->type) { | |
428 | case IOMMU_DOMAIN_BLOCKED: | |
429 | type = "blocked\n"; | |
430 | break; | |
431 | case IOMMU_DOMAIN_IDENTITY: | |
432 | type = "identity\n"; | |
433 | break; | |
434 | case IOMMU_DOMAIN_UNMANAGED: | |
435 | type = "unmanaged\n"; | |
436 | break; | |
437 | case IOMMU_DOMAIN_DMA: | |
24f307d8 | 438 | type = "DMA\n"; |
c52c72d3 OJ |
439 | break; |
440 | } | |
441 | } | |
442 | strcpy(buf, type); | |
443 | ||
444 | return strlen(type); | |
445 | } | |
446 | ||
d72e31c9 AW |
447 | static IOMMU_GROUP_ATTR(name, S_IRUGO, iommu_group_show_name, NULL); |
448 | ||
bc7d12b9 EA |
449 | static IOMMU_GROUP_ATTR(reserved_regions, 0444, |
450 | iommu_group_show_resv_regions, NULL); | |
451 | ||
c52c72d3 OJ |
452 | static IOMMU_GROUP_ATTR(type, 0444, iommu_group_show_type, NULL); |
453 | ||
d72e31c9 AW |
454 | static void iommu_group_release(struct kobject *kobj) |
455 | { | |
456 | struct iommu_group *group = to_iommu_group(kobj); | |
457 | ||
269aa808 JR |
458 | pr_debug("Releasing group %d\n", group->id); |
459 | ||
d72e31c9 AW |
460 | if (group->iommu_data_release) |
461 | group->iommu_data_release(group->iommu_data); | |
462 | ||
feccf398 | 463 | ida_simple_remove(&iommu_group_ida, group->id); |
d72e31c9 | 464 | |
53723dc5 JR |
465 | if (group->default_domain) |
466 | iommu_domain_free(group->default_domain); | |
467 | ||
d72e31c9 AW |
468 | kfree(group->name); |
469 | kfree(group); | |
470 | } | |
471 | ||
472 | static struct kobj_type iommu_group_ktype = { | |
473 | .sysfs_ops = &iommu_group_sysfs_ops, | |
474 | .release = iommu_group_release, | |
475 | }; | |
476 | ||
477 | /** | |
478 | * iommu_group_alloc - Allocate a new group | |
d72e31c9 AW |
479 | * |
480 | * This function is called by an iommu driver to allocate a new iommu | |
481 | * group. The iommu group represents the minimum granularity of the iommu. | |
482 | * Upon successful return, the caller holds a reference to the supplied | |
483 | * group in order to hold the group until devices are added. Use | |
484 | * iommu_group_put() to release this extra reference count, allowing the | |
485 | * group to be automatically reclaimed once it has no devices or external | |
486 | * references. | |
487 | */ | |
488 | struct iommu_group *iommu_group_alloc(void) | |
1460432c | 489 | { |
d72e31c9 AW |
490 | struct iommu_group *group; |
491 | int ret; | |
492 | ||
493 | group = kzalloc(sizeof(*group), GFP_KERNEL); | |
494 | if (!group) | |
495 | return ERR_PTR(-ENOMEM); | |
496 | ||
497 | group->kobj.kset = iommu_group_kset; | |
498 | mutex_init(&group->mutex); | |
499 | INIT_LIST_HEAD(&group->devices); | |
500 | BLOCKING_INIT_NOTIFIER_HEAD(&group->notifier); | |
501 | ||
feccf398 HK |
502 | ret = ida_simple_get(&iommu_group_ida, 0, 0, GFP_KERNEL); |
503 | if (ret < 0) { | |
d72e31c9 | 504 | kfree(group); |
feccf398 | 505 | return ERR_PTR(ret); |
d72e31c9 | 506 | } |
feccf398 | 507 | group->id = ret; |
1460432c | 508 | |
d72e31c9 AW |
509 | ret = kobject_init_and_add(&group->kobj, &iommu_group_ktype, |
510 | NULL, "%d", group->id); | |
511 | if (ret) { | |
feccf398 | 512 | ida_simple_remove(&iommu_group_ida, group->id); |
7cc31613 | 513 | kobject_put(&group->kobj); |
d72e31c9 AW |
514 | return ERR_PTR(ret); |
515 | } | |
516 | ||
517 | group->devices_kobj = kobject_create_and_add("devices", &group->kobj); | |
518 | if (!group->devices_kobj) { | |
519 | kobject_put(&group->kobj); /* triggers .release & free */ | |
520 | return ERR_PTR(-ENOMEM); | |
521 | } | |
522 | ||
523 | /* | |
524 | * The devices_kobj holds a reference on the group kobject, so | |
525 | * as long as that exists so will the group. We can therefore | |
526 | * use the devices_kobj for reference counting. | |
527 | */ | |
528 | kobject_put(&group->kobj); | |
529 | ||
bc7d12b9 EA |
530 | ret = iommu_group_create_file(group, |
531 | &iommu_group_attr_reserved_regions); | |
532 | if (ret) | |
533 | return ERR_PTR(ret); | |
534 | ||
c52c72d3 OJ |
535 | ret = iommu_group_create_file(group, &iommu_group_attr_type); |
536 | if (ret) | |
537 | return ERR_PTR(ret); | |
538 | ||
269aa808 JR |
539 | pr_debug("Allocated group %d\n", group->id); |
540 | ||
d72e31c9 AW |
541 | return group; |
542 | } | |
543 | EXPORT_SYMBOL_GPL(iommu_group_alloc); | |
544 | ||
aa16bea9 AK |
545 | struct iommu_group *iommu_group_get_by_id(int id) |
546 | { | |
547 | struct kobject *group_kobj; | |
548 | struct iommu_group *group; | |
549 | const char *name; | |
550 | ||
551 | if (!iommu_group_kset) | |
552 | return NULL; | |
553 | ||
554 | name = kasprintf(GFP_KERNEL, "%d", id); | |
555 | if (!name) | |
556 | return NULL; | |
557 | ||
558 | group_kobj = kset_find_obj(iommu_group_kset, name); | |
559 | kfree(name); | |
560 | ||
561 | if (!group_kobj) | |
562 | return NULL; | |
563 | ||
564 | group = container_of(group_kobj, struct iommu_group, kobj); | |
565 | BUG_ON(group->id != id); | |
566 | ||
567 | kobject_get(group->devices_kobj); | |
568 | kobject_put(&group->kobj); | |
569 | ||
570 | return group; | |
571 | } | |
572 | EXPORT_SYMBOL_GPL(iommu_group_get_by_id); | |
573 | ||
d72e31c9 AW |
574 | /** |
575 | * iommu_group_get_iommudata - retrieve iommu_data registered for a group | |
576 | * @group: the group | |
577 | * | |
578 | * iommu drivers can store data in the group for use when doing iommu | |
579 | * operations. This function provides a way to retrieve it. Caller | |
580 | * should hold a group reference. | |
581 | */ | |
582 | void *iommu_group_get_iommudata(struct iommu_group *group) | |
583 | { | |
584 | return group->iommu_data; | |
585 | } | |
586 | EXPORT_SYMBOL_GPL(iommu_group_get_iommudata); | |
587 | ||
588 | /** | |
589 | * iommu_group_set_iommudata - set iommu_data for a group | |
590 | * @group: the group | |
591 | * @iommu_data: new data | |
592 | * @release: release function for iommu_data | |
593 | * | |
594 | * iommu drivers can store data in the group for use when doing iommu | |
595 | * operations. This function provides a way to set the data after | |
596 | * the group has been allocated. Caller should hold a group reference. | |
597 | */ | |
598 | void iommu_group_set_iommudata(struct iommu_group *group, void *iommu_data, | |
599 | void (*release)(void *iommu_data)) | |
1460432c | 600 | { |
d72e31c9 AW |
601 | group->iommu_data = iommu_data; |
602 | group->iommu_data_release = release; | |
603 | } | |
604 | EXPORT_SYMBOL_GPL(iommu_group_set_iommudata); | |
1460432c | 605 | |
d72e31c9 AW |
606 | /** |
607 | * iommu_group_set_name - set name for a group | |
608 | * @group: the group | |
609 | * @name: name | |
610 | * | |
611 | * Allow iommu driver to set a name for a group. When set it will | |
612 | * appear in a name attribute file under the group in sysfs. | |
613 | */ | |
614 | int iommu_group_set_name(struct iommu_group *group, const char *name) | |
615 | { | |
616 | int ret; | |
617 | ||
618 | if (group->name) { | |
619 | iommu_group_remove_file(group, &iommu_group_attr_name); | |
620 | kfree(group->name); | |
621 | group->name = NULL; | |
622 | if (!name) | |
623 | return 0; | |
624 | } | |
625 | ||
626 | group->name = kstrdup(name, GFP_KERNEL); | |
627 | if (!group->name) | |
628 | return -ENOMEM; | |
629 | ||
630 | ret = iommu_group_create_file(group, &iommu_group_attr_name); | |
631 | if (ret) { | |
632 | kfree(group->name); | |
633 | group->name = NULL; | |
634 | return ret; | |
635 | } | |
1460432c AW |
636 | |
637 | return 0; | |
638 | } | |
d72e31c9 | 639 | EXPORT_SYMBOL_GPL(iommu_group_set_name); |
1460432c | 640 | |
beed2821 JR |
641 | static int iommu_group_create_direct_mappings(struct iommu_group *group, |
642 | struct device *dev) | |
643 | { | |
644 | struct iommu_domain *domain = group->default_domain; | |
e5b5234a | 645 | struct iommu_resv_region *entry; |
beed2821 JR |
646 | struct list_head mappings; |
647 | unsigned long pg_size; | |
648 | int ret = 0; | |
649 | ||
650 | if (!domain || domain->type != IOMMU_DOMAIN_DMA) | |
651 | return 0; | |
652 | ||
d16e0faa | 653 | BUG_ON(!domain->pgsize_bitmap); |
beed2821 | 654 | |
d16e0faa | 655 | pg_size = 1UL << __ffs(domain->pgsize_bitmap); |
beed2821 JR |
656 | INIT_LIST_HEAD(&mappings); |
657 | ||
e5b5234a | 658 | iommu_get_resv_regions(dev, &mappings); |
beed2821 JR |
659 | |
660 | /* We need to consider overlapping regions for different devices */ | |
661 | list_for_each_entry(entry, &mappings, list) { | |
662 | dma_addr_t start, end, addr; | |
663 | ||
e5b5234a EA |
664 | if (domain->ops->apply_resv_region) |
665 | domain->ops->apply_resv_region(dev, domain, entry); | |
33b21a6b | 666 | |
beed2821 JR |
667 | start = ALIGN(entry->start, pg_size); |
668 | end = ALIGN(entry->start + entry->length, pg_size); | |
669 | ||
adfd3738 EA |
670 | if (entry->type != IOMMU_RESV_DIRECT && |
671 | entry->type != IOMMU_RESV_DIRECT_RELAXABLE) | |
544a25d9 EA |
672 | continue; |
673 | ||
beed2821 JR |
674 | for (addr = start; addr < end; addr += pg_size) { |
675 | phys_addr_t phys_addr; | |
676 | ||
677 | phys_addr = iommu_iova_to_phys(domain, addr); | |
678 | if (phys_addr) | |
679 | continue; | |
680 | ||
681 | ret = iommu_map(domain, addr, addr, pg_size, entry->prot); | |
682 | if (ret) | |
683 | goto out; | |
684 | } | |
685 | ||
686 | } | |
687 | ||
add02cfd JR |
688 | iommu_flush_tlb_all(domain); |
689 | ||
beed2821 | 690 | out: |
e5b5234a | 691 | iommu_put_resv_regions(dev, &mappings); |
beed2821 JR |
692 | |
693 | return ret; | |
694 | } | |
695 | ||
bd421264 JR |
696 | static bool iommu_is_attach_deferred(struct iommu_domain *domain, |
697 | struct device *dev) | |
698 | { | |
699 | if (domain->ops->is_attach_deferred) | |
700 | return domain->ops->is_attach_deferred(domain, dev); | |
701 | ||
702 | return false; | |
703 | } | |
704 | ||
d72e31c9 AW |
705 | /** |
706 | * iommu_group_add_device - add a device to an iommu group | |
707 | * @group: the group into which to add the device (reference should be held) | |
708 | * @dev: the device | |
709 | * | |
710 | * This function is called by an iommu driver to add a device into a | |
711 | * group. Adding a device increments the group reference count. | |
712 | */ | |
713 | int iommu_group_add_device(struct iommu_group *group, struct device *dev) | |
1460432c | 714 | { |
d72e31c9 | 715 | int ret, i = 0; |
c09e22d5 | 716 | struct group_device *device; |
d72e31c9 AW |
717 | |
718 | device = kzalloc(sizeof(*device), GFP_KERNEL); | |
719 | if (!device) | |
720 | return -ENOMEM; | |
721 | ||
722 | device->dev = dev; | |
1460432c | 723 | |
d72e31c9 | 724 | ret = sysfs_create_link(&dev->kobj, &group->kobj, "iommu_group"); |
797a8b4d RM |
725 | if (ret) |
726 | goto err_free_device; | |
d72e31c9 AW |
727 | |
728 | device->name = kasprintf(GFP_KERNEL, "%s", kobject_name(&dev->kobj)); | |
729 | rename: | |
730 | if (!device->name) { | |
797a8b4d RM |
731 | ret = -ENOMEM; |
732 | goto err_remove_link; | |
d72e31c9 | 733 | } |
1460432c | 734 | |
d72e31c9 AW |
735 | ret = sysfs_create_link_nowarn(group->devices_kobj, |
736 | &dev->kobj, device->name); | |
737 | if (ret) { | |
d72e31c9 AW |
738 | if (ret == -EEXIST && i >= 0) { |
739 | /* | |
740 | * Account for the slim chance of collision | |
741 | * and append an instance to the name. | |
742 | */ | |
797a8b4d | 743 | kfree(device->name); |
d72e31c9 AW |
744 | device->name = kasprintf(GFP_KERNEL, "%s.%d", |
745 | kobject_name(&dev->kobj), i++); | |
746 | goto rename; | |
747 | } | |
797a8b4d | 748 | goto err_free_name; |
d72e31c9 AW |
749 | } |
750 | ||
751 | kobject_get(group->devices_kobj); | |
752 | ||
753 | dev->iommu_group = group; | |
754 | ||
beed2821 JR |
755 | iommu_group_create_direct_mappings(group, dev); |
756 | ||
d72e31c9 AW |
757 | mutex_lock(&group->mutex); |
758 | list_add_tail(&device->list, &group->devices); | |
bd421264 | 759 | if (group->domain && !iommu_is_attach_deferred(group->domain, dev)) |
797a8b4d | 760 | ret = __iommu_attach_device(group->domain, dev); |
d72e31c9 | 761 | mutex_unlock(&group->mutex); |
797a8b4d RM |
762 | if (ret) |
763 | goto err_put_group; | |
d72e31c9 AW |
764 | |
765 | /* Notify any listeners about change to group. */ | |
766 | blocking_notifier_call_chain(&group->notifier, | |
767 | IOMMU_GROUP_NOTIFY_ADD_DEVICE, dev); | |
d1cf7e82 SK |
768 | |
769 | trace_add_device_to_group(group->id, dev); | |
269aa808 | 770 | |
780da9e4 | 771 | dev_info(dev, "Adding to iommu group %d\n", group->id); |
269aa808 | 772 | |
1460432c | 773 | return 0; |
797a8b4d RM |
774 | |
775 | err_put_group: | |
776 | mutex_lock(&group->mutex); | |
777 | list_del(&device->list); | |
778 | mutex_unlock(&group->mutex); | |
779 | dev->iommu_group = NULL; | |
780 | kobject_put(group->devices_kobj); | |
7d4e6ccd | 781 | sysfs_remove_link(group->devices_kobj, device->name); |
797a8b4d RM |
782 | err_free_name: |
783 | kfree(device->name); | |
784 | err_remove_link: | |
785 | sysfs_remove_link(&dev->kobj, "iommu_group"); | |
786 | err_free_device: | |
787 | kfree(device); | |
780da9e4 | 788 | dev_err(dev, "Failed to add to iommu group %d: %d\n", group->id, ret); |
797a8b4d | 789 | return ret; |
1460432c | 790 | } |
d72e31c9 | 791 | EXPORT_SYMBOL_GPL(iommu_group_add_device); |
1460432c | 792 | |
d72e31c9 AW |
793 | /** |
794 | * iommu_group_remove_device - remove a device from it's current group | |
795 | * @dev: device to be removed | |
796 | * | |
797 | * This function is called by an iommu driver to remove the device from | |
798 | * it's current group. This decrements the iommu group reference count. | |
799 | */ | |
800 | void iommu_group_remove_device(struct device *dev) | |
801 | { | |
802 | struct iommu_group *group = dev->iommu_group; | |
c09e22d5 | 803 | struct group_device *tmp_device, *device = NULL; |
d72e31c9 | 804 | |
780da9e4 | 805 | dev_info(dev, "Removing from iommu group %d\n", group->id); |
269aa808 | 806 | |
d72e31c9 AW |
807 | /* Pre-notify listeners that a device is being removed. */ |
808 | blocking_notifier_call_chain(&group->notifier, | |
809 | IOMMU_GROUP_NOTIFY_DEL_DEVICE, dev); | |
810 | ||
811 | mutex_lock(&group->mutex); | |
812 | list_for_each_entry(tmp_device, &group->devices, list) { | |
813 | if (tmp_device->dev == dev) { | |
814 | device = tmp_device; | |
815 | list_del(&device->list); | |
816 | break; | |
817 | } | |
818 | } | |
819 | mutex_unlock(&group->mutex); | |
820 | ||
821 | if (!device) | |
822 | return; | |
823 | ||
824 | sysfs_remove_link(group->devices_kobj, device->name); | |
825 | sysfs_remove_link(&dev->kobj, "iommu_group"); | |
826 | ||
2e757086 SK |
827 | trace_remove_device_from_group(group->id, dev); |
828 | ||
d72e31c9 AW |
829 | kfree(device->name); |
830 | kfree(device); | |
831 | dev->iommu_group = NULL; | |
832 | kobject_put(group->devices_kobj); | |
833 | } | |
834 | EXPORT_SYMBOL_GPL(iommu_group_remove_device); | |
835 | ||
426a2738 JR |
836 | static int iommu_group_device_count(struct iommu_group *group) |
837 | { | |
c09e22d5 | 838 | struct group_device *entry; |
426a2738 JR |
839 | int ret = 0; |
840 | ||
841 | list_for_each_entry(entry, &group->devices, list) | |
842 | ret++; | |
843 | ||
844 | return ret; | |
845 | } | |
846 | ||
d72e31c9 AW |
847 | /** |
848 | * iommu_group_for_each_dev - iterate over each device in the group | |
849 | * @group: the group | |
850 | * @data: caller opaque data to be passed to callback function | |
851 | * @fn: caller supplied callback function | |
852 | * | |
853 | * This function is called by group users to iterate over group devices. | |
854 | * Callers should hold a reference count to the group during callback. | |
855 | * The group->mutex is held across callbacks, which will block calls to | |
856 | * iommu_group_add/remove_device. | |
857 | */ | |
e39cb8a3 JR |
858 | static int __iommu_group_for_each_dev(struct iommu_group *group, void *data, |
859 | int (*fn)(struct device *, void *)) | |
d72e31c9 | 860 | { |
c09e22d5 | 861 | struct group_device *device; |
d72e31c9 AW |
862 | int ret = 0; |
863 | ||
d72e31c9 AW |
864 | list_for_each_entry(device, &group->devices, list) { |
865 | ret = fn(device->dev, data); | |
866 | if (ret) | |
867 | break; | |
868 | } | |
e39cb8a3 JR |
869 | return ret; |
870 | } | |
871 | ||
872 | ||
873 | int iommu_group_for_each_dev(struct iommu_group *group, void *data, | |
874 | int (*fn)(struct device *, void *)) | |
875 | { | |
876 | int ret; | |
877 | ||
878 | mutex_lock(&group->mutex); | |
879 | ret = __iommu_group_for_each_dev(group, data, fn); | |
d72e31c9 | 880 | mutex_unlock(&group->mutex); |
e39cb8a3 | 881 | |
d72e31c9 AW |
882 | return ret; |
883 | } | |
884 | EXPORT_SYMBOL_GPL(iommu_group_for_each_dev); | |
885 | ||
886 | /** | |
887 | * iommu_group_get - Return the group for a device and increment reference | |
888 | * @dev: get the group that this device belongs to | |
889 | * | |
890 | * This function is called by iommu drivers and users to get the group | |
891 | * for the specified device. If found, the group is returned and the group | |
892 | * reference in incremented, else NULL. | |
893 | */ | |
894 | struct iommu_group *iommu_group_get(struct device *dev) | |
895 | { | |
896 | struct iommu_group *group = dev->iommu_group; | |
897 | ||
898 | if (group) | |
899 | kobject_get(group->devices_kobj); | |
900 | ||
901 | return group; | |
902 | } | |
903 | EXPORT_SYMBOL_GPL(iommu_group_get); | |
904 | ||
13f59a78 RM |
905 | /** |
906 | * iommu_group_ref_get - Increment reference on a group | |
907 | * @group: the group to use, must not be NULL | |
908 | * | |
909 | * This function is called by iommu drivers to take additional references on an | |
910 | * existing group. Returns the given group for convenience. | |
911 | */ | |
912 | struct iommu_group *iommu_group_ref_get(struct iommu_group *group) | |
913 | { | |
914 | kobject_get(group->devices_kobj); | |
915 | return group; | |
916 | } | |
a7ba5c3d | 917 | EXPORT_SYMBOL_GPL(iommu_group_ref_get); |
13f59a78 | 918 | |
d72e31c9 AW |
919 | /** |
920 | * iommu_group_put - Decrement group reference | |
921 | * @group: the group to use | |
922 | * | |
923 | * This function is called by iommu drivers and users to release the | |
924 | * iommu group. Once the reference count is zero, the group is released. | |
925 | */ | |
926 | void iommu_group_put(struct iommu_group *group) | |
927 | { | |
928 | if (group) | |
929 | kobject_put(group->devices_kobj); | |
930 | } | |
931 | EXPORT_SYMBOL_GPL(iommu_group_put); | |
932 | ||
933 | /** | |
934 | * iommu_group_register_notifier - Register a notifier for group changes | |
935 | * @group: the group to watch | |
936 | * @nb: notifier block to signal | |
937 | * | |
938 | * This function allows iommu group users to track changes in a group. | |
939 | * See include/linux/iommu.h for actions sent via this notifier. Caller | |
940 | * should hold a reference to the group throughout notifier registration. | |
941 | */ | |
942 | int iommu_group_register_notifier(struct iommu_group *group, | |
943 | struct notifier_block *nb) | |
944 | { | |
945 | return blocking_notifier_chain_register(&group->notifier, nb); | |
946 | } | |
947 | EXPORT_SYMBOL_GPL(iommu_group_register_notifier); | |
948 | ||
949 | /** | |
950 | * iommu_group_unregister_notifier - Unregister a notifier | |
951 | * @group: the group to watch | |
952 | * @nb: notifier block to signal | |
953 | * | |
954 | * Unregister a previously registered group notifier block. | |
955 | */ | |
956 | int iommu_group_unregister_notifier(struct iommu_group *group, | |
957 | struct notifier_block *nb) | |
958 | { | |
959 | return blocking_notifier_chain_unregister(&group->notifier, nb); | |
960 | } | |
961 | EXPORT_SYMBOL_GPL(iommu_group_unregister_notifier); | |
962 | ||
0c830e6b JP |
963 | /** |
964 | * iommu_register_device_fault_handler() - Register a device fault handler | |
965 | * @dev: the device | |
966 | * @handler: the fault handler | |
967 | * @data: private data passed as argument to the handler | |
968 | * | |
969 | * When an IOMMU fault event is received, this handler gets called with the | |
bf3255b3 JPB |
970 | * fault event and data as argument. The handler should return 0 on success. If |
971 | * the fault is recoverable (IOMMU_FAULT_PAGE_REQ), the consumer should also | |
972 | * complete the fault by calling iommu_page_response() with one of the following | |
973 | * response code: | |
974 | * - IOMMU_PAGE_RESP_SUCCESS: retry the translation | |
975 | * - IOMMU_PAGE_RESP_INVALID: terminate the fault | |
976 | * - IOMMU_PAGE_RESP_FAILURE: terminate the fault and stop reporting | |
977 | * page faults if possible. | |
0c830e6b JP |
978 | * |
979 | * Return 0 if the fault handler was installed successfully, or an error. | |
980 | */ | |
981 | int iommu_register_device_fault_handler(struct device *dev, | |
982 | iommu_dev_fault_handler_t handler, | |
983 | void *data) | |
984 | { | |
045a7042 | 985 | struct dev_iommu *param = dev->iommu; |
0c830e6b JP |
986 | int ret = 0; |
987 | ||
988 | if (!param) | |
989 | return -EINVAL; | |
990 | ||
991 | mutex_lock(¶m->lock); | |
992 | /* Only allow one fault handler registered for each device */ | |
993 | if (param->fault_param) { | |
994 | ret = -EBUSY; | |
995 | goto done_unlock; | |
996 | } | |
997 | ||
998 | get_device(dev); | |
999 | param->fault_param = kzalloc(sizeof(*param->fault_param), GFP_KERNEL); | |
1000 | if (!param->fault_param) { | |
1001 | put_device(dev); | |
1002 | ret = -ENOMEM; | |
1003 | goto done_unlock; | |
1004 | } | |
1005 | param->fault_param->handler = handler; | |
1006 | param->fault_param->data = data; | |
bf3255b3 JPB |
1007 | mutex_init(¶m->fault_param->lock); |
1008 | INIT_LIST_HEAD(¶m->fault_param->faults); | |
0c830e6b JP |
1009 | |
1010 | done_unlock: | |
1011 | mutex_unlock(¶m->lock); | |
1012 | ||
1013 | return ret; | |
1014 | } | |
1015 | EXPORT_SYMBOL_GPL(iommu_register_device_fault_handler); | |
1016 | ||
1017 | /** | |
1018 | * iommu_unregister_device_fault_handler() - Unregister the device fault handler | |
1019 | * @dev: the device | |
1020 | * | |
1021 | * Remove the device fault handler installed with | |
1022 | * iommu_register_device_fault_handler(). | |
1023 | * | |
1024 | * Return 0 on success, or an error. | |
1025 | */ | |
1026 | int iommu_unregister_device_fault_handler(struct device *dev) | |
1027 | { | |
045a7042 | 1028 | struct dev_iommu *param = dev->iommu; |
0c830e6b JP |
1029 | int ret = 0; |
1030 | ||
1031 | if (!param) | |
1032 | return -EINVAL; | |
1033 | ||
1034 | mutex_lock(¶m->lock); | |
1035 | ||
1036 | if (!param->fault_param) | |
1037 | goto unlock; | |
1038 | ||
bf3255b3 JPB |
1039 | /* we cannot unregister handler if there are pending faults */ |
1040 | if (!list_empty(¶m->fault_param->faults)) { | |
1041 | ret = -EBUSY; | |
1042 | goto unlock; | |
1043 | } | |
1044 | ||
0c830e6b JP |
1045 | kfree(param->fault_param); |
1046 | param->fault_param = NULL; | |
1047 | put_device(dev); | |
1048 | unlock: | |
1049 | mutex_unlock(¶m->lock); | |
1050 | ||
1051 | return ret; | |
1052 | } | |
1053 | EXPORT_SYMBOL_GPL(iommu_unregister_device_fault_handler); | |
1054 | ||
1055 | /** | |
1056 | * iommu_report_device_fault() - Report fault event to device driver | |
1057 | * @dev: the device | |
1058 | * @evt: fault event data | |
1059 | * | |
1060 | * Called by IOMMU drivers when a fault is detected, typically in a threaded IRQ | |
bf3255b3 JPB |
1061 | * handler. When this function fails and the fault is recoverable, it is the |
1062 | * caller's responsibility to complete the fault. | |
0c830e6b JP |
1063 | * |
1064 | * Return 0 on success, or an error. | |
1065 | */ | |
1066 | int iommu_report_device_fault(struct device *dev, struct iommu_fault_event *evt) | |
1067 | { | |
045a7042 | 1068 | struct dev_iommu *param = dev->iommu; |
bf3255b3 | 1069 | struct iommu_fault_event *evt_pending = NULL; |
0c830e6b JP |
1070 | struct iommu_fault_param *fparam; |
1071 | int ret = 0; | |
1072 | ||
1073 | if (!param || !evt) | |
1074 | return -EINVAL; | |
1075 | ||
1076 | /* we only report device fault if there is a handler registered */ | |
1077 | mutex_lock(¶m->lock); | |
1078 | fparam = param->fault_param; | |
1079 | if (!fparam || !fparam->handler) { | |
1080 | ret = -EINVAL; | |
1081 | goto done_unlock; | |
1082 | } | |
bf3255b3 JPB |
1083 | |
1084 | if (evt->fault.type == IOMMU_FAULT_PAGE_REQ && | |
1085 | (evt->fault.prm.flags & IOMMU_FAULT_PAGE_REQUEST_LAST_PAGE)) { | |
1086 | evt_pending = kmemdup(evt, sizeof(struct iommu_fault_event), | |
1087 | GFP_KERNEL); | |
1088 | if (!evt_pending) { | |
1089 | ret = -ENOMEM; | |
1090 | goto done_unlock; | |
1091 | } | |
1092 | mutex_lock(&fparam->lock); | |
1093 | list_add_tail(&evt_pending->list, &fparam->faults); | |
1094 | mutex_unlock(&fparam->lock); | |
1095 | } | |
1096 | ||
0c830e6b | 1097 | ret = fparam->handler(&evt->fault, fparam->data); |
bf3255b3 JPB |
1098 | if (ret && evt_pending) { |
1099 | mutex_lock(&fparam->lock); | |
1100 | list_del(&evt_pending->list); | |
1101 | mutex_unlock(&fparam->lock); | |
1102 | kfree(evt_pending); | |
1103 | } | |
0c830e6b JP |
1104 | done_unlock: |
1105 | mutex_unlock(¶m->lock); | |
1106 | return ret; | |
1107 | } | |
1108 | EXPORT_SYMBOL_GPL(iommu_report_device_fault); | |
1109 | ||
bf3255b3 JPB |
1110 | int iommu_page_response(struct device *dev, |
1111 | struct iommu_page_response *msg) | |
1112 | { | |
1113 | bool pasid_valid; | |
1114 | int ret = -EINVAL; | |
1115 | struct iommu_fault_event *evt; | |
1116 | struct iommu_fault_page_request *prm; | |
045a7042 | 1117 | struct dev_iommu *param = dev->iommu; |
bf3255b3 JPB |
1118 | struct iommu_domain *domain = iommu_get_domain_for_dev(dev); |
1119 | ||
1120 | if (!domain || !domain->ops->page_response) | |
1121 | return -ENODEV; | |
1122 | ||
1123 | if (!param || !param->fault_param) | |
1124 | return -EINVAL; | |
1125 | ||
1126 | if (msg->version != IOMMU_PAGE_RESP_VERSION_1 || | |
1127 | msg->flags & ~IOMMU_PAGE_RESP_PASID_VALID) | |
1128 | return -EINVAL; | |
1129 | ||
1130 | /* Only send response if there is a fault report pending */ | |
1131 | mutex_lock(¶m->fault_param->lock); | |
1132 | if (list_empty(¶m->fault_param->faults)) { | |
1133 | dev_warn_ratelimited(dev, "no pending PRQ, drop response\n"); | |
1134 | goto done_unlock; | |
1135 | } | |
1136 | /* | |
1137 | * Check if we have a matching page request pending to respond, | |
1138 | * otherwise return -EINVAL | |
1139 | */ | |
1140 | list_for_each_entry(evt, ¶m->fault_param->faults, list) { | |
1141 | prm = &evt->fault.prm; | |
1142 | pasid_valid = prm->flags & IOMMU_FAULT_PAGE_REQUEST_PASID_VALID; | |
1143 | ||
1144 | if ((pasid_valid && prm->pasid != msg->pasid) || | |
1145 | prm->grpid != msg->grpid) | |
1146 | continue; | |
1147 | ||
1148 | /* Sanitize the reply */ | |
1149 | msg->flags = pasid_valid ? IOMMU_PAGE_RESP_PASID_VALID : 0; | |
1150 | ||
1151 | ret = domain->ops->page_response(dev, evt, msg); | |
1152 | list_del(&evt->list); | |
1153 | kfree(evt); | |
1154 | break; | |
1155 | } | |
1156 | ||
1157 | done_unlock: | |
1158 | mutex_unlock(¶m->fault_param->lock); | |
1159 | return ret; | |
1160 | } | |
1161 | EXPORT_SYMBOL_GPL(iommu_page_response); | |
1162 | ||
d72e31c9 AW |
1163 | /** |
1164 | * iommu_group_id - Return ID for a group | |
1165 | * @group: the group to ID | |
1166 | * | |
1167 | * Return the unique ID for the group matching the sysfs group number. | |
1168 | */ | |
1169 | int iommu_group_id(struct iommu_group *group) | |
1170 | { | |
1171 | return group->id; | |
1172 | } | |
1173 | EXPORT_SYMBOL_GPL(iommu_group_id); | |
1460432c | 1174 | |
f096c061 AW |
1175 | static struct iommu_group *get_pci_alias_group(struct pci_dev *pdev, |
1176 | unsigned long *devfns); | |
1177 | ||
104a1c13 AW |
1178 | /* |
1179 | * To consider a PCI device isolated, we require ACS to support Source | |
1180 | * Validation, Request Redirection, Completer Redirection, and Upstream | |
1181 | * Forwarding. This effectively means that devices cannot spoof their | |
1182 | * requester ID, requests and completions cannot be redirected, and all | |
1183 | * transactions are forwarded upstream, even as it passes through a | |
1184 | * bridge where the target device is downstream. | |
1185 | */ | |
1186 | #define REQ_ACS_FLAGS (PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF) | |
1187 | ||
f096c061 AW |
1188 | /* |
1189 | * For multifunction devices which are not isolated from each other, find | |
1190 | * all the other non-isolated functions and look for existing groups. For | |
1191 | * each function, we also need to look for aliases to or from other devices | |
1192 | * that may already have a group. | |
1193 | */ | |
1194 | static struct iommu_group *get_pci_function_alias_group(struct pci_dev *pdev, | |
1195 | unsigned long *devfns) | |
1196 | { | |
1197 | struct pci_dev *tmp = NULL; | |
1198 | struct iommu_group *group; | |
1199 | ||
1200 | if (!pdev->multifunction || pci_acs_enabled(pdev, REQ_ACS_FLAGS)) | |
1201 | return NULL; | |
1202 | ||
1203 | for_each_pci_dev(tmp) { | |
1204 | if (tmp == pdev || tmp->bus != pdev->bus || | |
1205 | PCI_SLOT(tmp->devfn) != PCI_SLOT(pdev->devfn) || | |
1206 | pci_acs_enabled(tmp, REQ_ACS_FLAGS)) | |
1207 | continue; | |
1208 | ||
1209 | group = get_pci_alias_group(tmp, devfns); | |
1210 | if (group) { | |
1211 | pci_dev_put(tmp); | |
1212 | return group; | |
1213 | } | |
1214 | } | |
1215 | ||
1216 | return NULL; | |
1217 | } | |
1218 | ||
1219 | /* | |
338c3149 JL |
1220 | * Look for aliases to or from the given device for existing groups. DMA |
1221 | * aliases are only supported on the same bus, therefore the search | |
f096c061 AW |
1222 | * space is quite small (especially since we're really only looking at pcie |
1223 | * device, and therefore only expect multiple slots on the root complex or | |
1224 | * downstream switch ports). It's conceivable though that a pair of | |
1225 | * multifunction devices could have aliases between them that would cause a | |
1226 | * loop. To prevent this, we use a bitmap to track where we've been. | |
1227 | */ | |
1228 | static struct iommu_group *get_pci_alias_group(struct pci_dev *pdev, | |
1229 | unsigned long *devfns) | |
1230 | { | |
1231 | struct pci_dev *tmp = NULL; | |
1232 | struct iommu_group *group; | |
1233 | ||
1234 | if (test_and_set_bit(pdev->devfn & 0xff, devfns)) | |
1235 | return NULL; | |
1236 | ||
1237 | group = iommu_group_get(&pdev->dev); | |
1238 | if (group) | |
1239 | return group; | |
1240 | ||
1241 | for_each_pci_dev(tmp) { | |
1242 | if (tmp == pdev || tmp->bus != pdev->bus) | |
1243 | continue; | |
1244 | ||
1245 | /* We alias them or they alias us */ | |
338c3149 | 1246 | if (pci_devs_are_dma_aliases(pdev, tmp)) { |
f096c061 AW |
1247 | group = get_pci_alias_group(tmp, devfns); |
1248 | if (group) { | |
1249 | pci_dev_put(tmp); | |
1250 | return group; | |
1251 | } | |
1252 | ||
1253 | group = get_pci_function_alias_group(tmp, devfns); | |
1254 | if (group) { | |
1255 | pci_dev_put(tmp); | |
1256 | return group; | |
1257 | } | |
1258 | } | |
1259 | } | |
1260 | ||
1261 | return NULL; | |
1262 | } | |
1263 | ||
104a1c13 AW |
1264 | struct group_for_pci_data { |
1265 | struct pci_dev *pdev; | |
1266 | struct iommu_group *group; | |
1267 | }; | |
1268 | ||
1269 | /* | |
1270 | * DMA alias iterator callback, return the last seen device. Stop and return | |
1271 | * the IOMMU group if we find one along the way. | |
1272 | */ | |
1273 | static int get_pci_alias_or_group(struct pci_dev *pdev, u16 alias, void *opaque) | |
1274 | { | |
1275 | struct group_for_pci_data *data = opaque; | |
1276 | ||
1277 | data->pdev = pdev; | |
1278 | data->group = iommu_group_get(&pdev->dev); | |
1279 | ||
1280 | return data->group != NULL; | |
1281 | } | |
1282 | ||
6eab556a JR |
1283 | /* |
1284 | * Generic device_group call-back function. It just allocates one | |
1285 | * iommu-group per device. | |
1286 | */ | |
1287 | struct iommu_group *generic_device_group(struct device *dev) | |
1288 | { | |
7f7a2304 | 1289 | return iommu_group_alloc(); |
6eab556a | 1290 | } |
a7ba5c3d | 1291 | EXPORT_SYMBOL_GPL(generic_device_group); |
6eab556a | 1292 | |
104a1c13 AW |
1293 | /* |
1294 | * Use standard PCI bus topology, isolation features, and DMA alias quirks | |
1295 | * to find or create an IOMMU group for a device. | |
1296 | */ | |
5e62292b | 1297 | struct iommu_group *pci_device_group(struct device *dev) |
104a1c13 | 1298 | { |
5e62292b | 1299 | struct pci_dev *pdev = to_pci_dev(dev); |
104a1c13 AW |
1300 | struct group_for_pci_data data; |
1301 | struct pci_bus *bus; | |
1302 | struct iommu_group *group = NULL; | |
f096c061 | 1303 | u64 devfns[4] = { 0 }; |
104a1c13 | 1304 | |
5e62292b JR |
1305 | if (WARN_ON(!dev_is_pci(dev))) |
1306 | return ERR_PTR(-EINVAL); | |
1307 | ||
104a1c13 AW |
1308 | /* |
1309 | * Find the upstream DMA alias for the device. A device must not | |
1310 | * be aliased due to topology in order to have its own IOMMU group. | |
1311 | * If we find an alias along the way that already belongs to a | |
1312 | * group, use it. | |
1313 | */ | |
1314 | if (pci_for_each_dma_alias(pdev, get_pci_alias_or_group, &data)) | |
1315 | return data.group; | |
1316 | ||
1317 | pdev = data.pdev; | |
1318 | ||
1319 | /* | |
1320 | * Continue upstream from the point of minimum IOMMU granularity | |
1321 | * due to aliases to the point where devices are protected from | |
1322 | * peer-to-peer DMA by PCI ACS. Again, if we find an existing | |
1323 | * group, use it. | |
1324 | */ | |
1325 | for (bus = pdev->bus; !pci_is_root_bus(bus); bus = bus->parent) { | |
1326 | if (!bus->self) | |
1327 | continue; | |
1328 | ||
1329 | if (pci_acs_path_enabled(bus->self, NULL, REQ_ACS_FLAGS)) | |
1330 | break; | |
1331 | ||
1332 | pdev = bus->self; | |
1333 | ||
1334 | group = iommu_group_get(&pdev->dev); | |
1335 | if (group) | |
1336 | return group; | |
1337 | } | |
1338 | ||
1339 | /* | |
f096c061 AW |
1340 | * Look for existing groups on device aliases. If we alias another |
1341 | * device or another device aliases us, use the same group. | |
104a1c13 | 1342 | */ |
f096c061 AW |
1343 | group = get_pci_alias_group(pdev, (unsigned long *)devfns); |
1344 | if (group) | |
1345 | return group; | |
104a1c13 AW |
1346 | |
1347 | /* | |
f096c061 AW |
1348 | * Look for existing groups on non-isolated functions on the same |
1349 | * slot and aliases of those funcions, if any. No need to clear | |
1350 | * the search bitmap, the tested devfns are still valid. | |
104a1c13 | 1351 | */ |
f096c061 AW |
1352 | group = get_pci_function_alias_group(pdev, (unsigned long *)devfns); |
1353 | if (group) | |
1354 | return group; | |
104a1c13 AW |
1355 | |
1356 | /* No shared group found, allocate new */ | |
7f7a2304 | 1357 | return iommu_group_alloc(); |
104a1c13 | 1358 | } |
a7ba5c3d | 1359 | EXPORT_SYMBOL_GPL(pci_device_group); |
104a1c13 | 1360 | |
eab03e2a NG |
1361 | /* Get the IOMMU group for device on fsl-mc bus */ |
1362 | struct iommu_group *fsl_mc_device_group(struct device *dev) | |
1363 | { | |
1364 | struct device *cont_dev = fsl_mc_cont_dev(dev); | |
1365 | struct iommu_group *group; | |
1366 | ||
1367 | group = iommu_group_get(cont_dev); | |
1368 | if (!group) | |
1369 | group = iommu_group_alloc(); | |
1370 | return group; | |
1371 | } | |
a7ba5c3d | 1372 | EXPORT_SYMBOL_GPL(fsl_mc_device_group); |
eab03e2a | 1373 | |
104a1c13 AW |
1374 | /** |
1375 | * iommu_group_get_for_dev - Find or create the IOMMU group for a device | |
1376 | * @dev: target device | |
1377 | * | |
1378 | * This function is intended to be called by IOMMU drivers and extended to | |
1379 | * support common, bus-defined algorithms when determining or creating the | |
1380 | * IOMMU group for a device. On success, the caller will hold a reference | |
1381 | * to the returned IOMMU group, which will already include the provided | |
1382 | * device. The reference should be released with iommu_group_put(). | |
1383 | */ | |
1384 | struct iommu_group *iommu_group_get_for_dev(struct device *dev) | |
1385 | { | |
46c6b2bc | 1386 | const struct iommu_ops *ops = dev->bus->iommu_ops; |
c4a783b8 | 1387 | struct iommu_group *group; |
104a1c13 AW |
1388 | int ret; |
1389 | ||
1390 | group = iommu_group_get(dev); | |
1391 | if (group) | |
1392 | return group; | |
1393 | ||
05f80300 RM |
1394 | if (!ops) |
1395 | return ERR_PTR(-EINVAL); | |
104a1c13 | 1396 | |
05f80300 | 1397 | group = ops->device_group(dev); |
72dcac63 JR |
1398 | if (WARN_ON_ONCE(group == NULL)) |
1399 | return ERR_PTR(-EINVAL); | |
1400 | ||
104a1c13 AW |
1401 | if (IS_ERR(group)) |
1402 | return group; | |
1403 | ||
1228236d JR |
1404 | /* |
1405 | * Try to allocate a default domain - needs support from the | |
1406 | * IOMMU driver. | |
1407 | */ | |
1408 | if (!group->default_domain) { | |
fccb4e3b WD |
1409 | struct iommu_domain *dom; |
1410 | ||
1411 | dom = __iommu_domain_alloc(dev->bus, iommu_def_domain_type); | |
1412 | if (!dom && iommu_def_domain_type != IOMMU_DOMAIN_DMA) { | |
fccb4e3b | 1413 | dom = __iommu_domain_alloc(dev->bus, IOMMU_DOMAIN_DMA); |
8bc32a28 JR |
1414 | if (dom) { |
1415 | dev_warn(dev, | |
1416 | "failed to allocate default IOMMU domain of type %u; falling back to IOMMU_DOMAIN_DMA", | |
1417 | iommu_def_domain_type); | |
1418 | } | |
fccb4e3b WD |
1419 | } |
1420 | ||
1421 | group->default_domain = dom; | |
eebb8034 | 1422 | if (!group->domain) |
fccb4e3b | 1423 | group->domain = dom; |
68a6efe8 ZL |
1424 | |
1425 | if (dom && !iommu_dma_strict) { | |
1426 | int attr = 1; | |
1427 | iommu_domain_set_attr(dom, | |
1428 | DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE, | |
1429 | &attr); | |
1430 | } | |
1228236d JR |
1431 | } |
1432 | ||
104a1c13 AW |
1433 | ret = iommu_group_add_device(group, dev); |
1434 | if (ret) { | |
1435 | iommu_group_put(group); | |
1436 | return ERR_PTR(ret); | |
1437 | } | |
1438 | ||
1439 | return group; | |
1440 | } | |
ae74c19f | 1441 | EXPORT_SYMBOL_GPL(iommu_group_get_for_dev); |
104a1c13 | 1442 | |
6827ca83 JR |
1443 | struct iommu_domain *iommu_group_default_domain(struct iommu_group *group) |
1444 | { | |
1445 | return group->default_domain; | |
1446 | } | |
1447 | ||
d72e31c9 | 1448 | static int add_iommu_group(struct device *dev, void *data) |
1460432c | 1449 | { |
cc5aed44 | 1450 | int ret = iommu_probe_device(dev); |
38667f18 JR |
1451 | |
1452 | /* | |
1453 | * We ignore -ENODEV errors for now, as they just mean that the | |
1454 | * device is not translated by an IOMMU. We still care about | |
1455 | * other errors and fail to initialize when they happen. | |
1456 | */ | |
1457 | if (ret == -ENODEV) | |
1458 | ret = 0; | |
1459 | ||
1460 | return ret; | |
1460432c AW |
1461 | } |
1462 | ||
8da30142 JR |
1463 | static int remove_iommu_group(struct device *dev, void *data) |
1464 | { | |
cc5aed44 | 1465 | iommu_release_device(dev); |
1460432c AW |
1466 | |
1467 | return 0; | |
1468 | } | |
1469 | ||
d72e31c9 AW |
1470 | static int iommu_bus_notifier(struct notifier_block *nb, |
1471 | unsigned long action, void *data) | |
1460432c | 1472 | { |
cc5aed44 | 1473 | unsigned long group_action = 0; |
1460432c | 1474 | struct device *dev = data; |
d72e31c9 | 1475 | struct iommu_group *group; |
d72e31c9 AW |
1476 | |
1477 | /* | |
1478 | * ADD/DEL call into iommu driver ops if provided, which may | |
1479 | * result in ADD/DEL notifiers to group->notifier | |
1480 | */ | |
1481 | if (action == BUS_NOTIFY_ADD_DEVICE) { | |
cc5aed44 | 1482 | int ret; |
3ba8775f | 1483 | |
cc5aed44 JR |
1484 | ret = iommu_probe_device(dev); |
1485 | return (ret) ? NOTIFY_DONE : NOTIFY_OK; | |
843cb6dc | 1486 | } else if (action == BUS_NOTIFY_REMOVED_DEVICE) { |
cc5aed44 JR |
1487 | iommu_release_device(dev); |
1488 | return NOTIFY_OK; | |
d72e31c9 | 1489 | } |
1460432c | 1490 | |
d72e31c9 AW |
1491 | /* |
1492 | * Remaining BUS_NOTIFYs get filtered and republished to the | |
1493 | * group, if anyone is listening | |
1494 | */ | |
1495 | group = iommu_group_get(dev); | |
1496 | if (!group) | |
1497 | return 0; | |
1460432c | 1498 | |
d72e31c9 AW |
1499 | switch (action) { |
1500 | case BUS_NOTIFY_BIND_DRIVER: | |
1501 | group_action = IOMMU_GROUP_NOTIFY_BIND_DRIVER; | |
1502 | break; | |
1503 | case BUS_NOTIFY_BOUND_DRIVER: | |
1504 | group_action = IOMMU_GROUP_NOTIFY_BOUND_DRIVER; | |
1505 | break; | |
1506 | case BUS_NOTIFY_UNBIND_DRIVER: | |
1507 | group_action = IOMMU_GROUP_NOTIFY_UNBIND_DRIVER; | |
1508 | break; | |
1509 | case BUS_NOTIFY_UNBOUND_DRIVER: | |
1510 | group_action = IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER; | |
1511 | break; | |
1512 | } | |
1460432c | 1513 | |
d72e31c9 AW |
1514 | if (group_action) |
1515 | blocking_notifier_call_chain(&group->notifier, | |
1516 | group_action, dev); | |
1460432c | 1517 | |
d72e31c9 | 1518 | iommu_group_put(group); |
1460432c AW |
1519 | return 0; |
1520 | } | |
1521 | ||
fb3e3065 | 1522 | static int iommu_bus_init(struct bus_type *bus, const struct iommu_ops *ops) |
ff21776d | 1523 | { |
fb3e3065 MS |
1524 | int err; |
1525 | struct notifier_block *nb; | |
b22f6434 | 1526 | |
fb3e3065 MS |
1527 | nb = kzalloc(sizeof(struct notifier_block), GFP_KERNEL); |
1528 | if (!nb) | |
1529 | return -ENOMEM; | |
1530 | ||
1531 | nb->notifier_call = iommu_bus_notifier; | |
1532 | ||
1533 | err = bus_register_notifier(bus, nb); | |
8da30142 JR |
1534 | if (err) |
1535 | goto out_free; | |
d7da6bdc | 1536 | |
8cec63e5 | 1537 | err = bus_for_each_dev(bus, NULL, NULL, add_iommu_group); |
8da30142 JR |
1538 | if (err) |
1539 | goto out_err; | |
1540 | ||
d7da6bdc HS |
1541 | |
1542 | return 0; | |
8da30142 JR |
1543 | |
1544 | out_err: | |
1545 | /* Clean up */ | |
8cec63e5 | 1546 | bus_for_each_dev(bus, NULL, NULL, remove_iommu_group); |
8da30142 JR |
1547 | bus_unregister_notifier(bus, nb); |
1548 | ||
1549 | out_free: | |
1550 | kfree(nb); | |
1551 | ||
1552 | return err; | |
ff21776d | 1553 | } |
fc2100eb | 1554 | |
ff21776d JR |
1555 | /** |
1556 | * bus_set_iommu - set iommu-callbacks for the bus | |
1557 | * @bus: bus. | |
1558 | * @ops: the callbacks provided by the iommu-driver | |
1559 | * | |
1560 | * This function is called by an iommu driver to set the iommu methods | |
1561 | * used for a particular bus. Drivers for devices on that bus can use | |
1562 | * the iommu-api after these ops are registered. | |
1563 | * This special function is needed because IOMMUs are usually devices on | |
1564 | * the bus itself, so the iommu drivers are not initialized when the bus | |
1565 | * is set up. With this function the iommu-driver can set the iommu-ops | |
1566 | * afterwards. | |
1567 | */ | |
b22f6434 | 1568 | int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops) |
fc2100eb | 1569 | { |
d7da6bdc HS |
1570 | int err; |
1571 | ||
4312cf7f WD |
1572 | if (ops == NULL) { |
1573 | bus->iommu_ops = NULL; | |
1574 | return 0; | |
1575 | } | |
1576 | ||
ff21776d JR |
1577 | if (bus->iommu_ops != NULL) |
1578 | return -EBUSY; | |
fc2100eb | 1579 | |
ff21776d JR |
1580 | bus->iommu_ops = ops; |
1581 | ||
1582 | /* Do IOMMU specific setup for this bus-type */ | |
d7da6bdc HS |
1583 | err = iommu_bus_init(bus, ops); |
1584 | if (err) | |
1585 | bus->iommu_ops = NULL; | |
1586 | ||
1587 | return err; | |
fc2100eb | 1588 | } |
ff21776d | 1589 | EXPORT_SYMBOL_GPL(bus_set_iommu); |
fc2100eb | 1590 | |
a1b60c1c | 1591 | bool iommu_present(struct bus_type *bus) |
fc2100eb | 1592 | { |
94441c3b | 1593 | return bus->iommu_ops != NULL; |
fc2100eb | 1594 | } |
a1b60c1c | 1595 | EXPORT_SYMBOL_GPL(iommu_present); |
fc2100eb | 1596 | |
3c0e0ca0 JR |
1597 | bool iommu_capable(struct bus_type *bus, enum iommu_cap cap) |
1598 | { | |
1599 | if (!bus->iommu_ops || !bus->iommu_ops->capable) | |
1600 | return false; | |
1601 | ||
1602 | return bus->iommu_ops->capable(cap); | |
1603 | } | |
1604 | EXPORT_SYMBOL_GPL(iommu_capable); | |
1605 | ||
4f3f8d9d OBC |
1606 | /** |
1607 | * iommu_set_fault_handler() - set a fault handler for an iommu domain | |
1608 | * @domain: iommu domain | |
1609 | * @handler: fault handler | |
77ca2332 | 1610 | * @token: user data, will be passed back to the fault handler |
0ed6d2d2 OBC |
1611 | * |
1612 | * This function should be used by IOMMU users which want to be notified | |
1613 | * whenever an IOMMU fault happens. | |
1614 | * | |
1615 | * The fault handler itself should return 0 on success, and an appropriate | |
1616 | * error code otherwise. | |
4f3f8d9d OBC |
1617 | */ |
1618 | void iommu_set_fault_handler(struct iommu_domain *domain, | |
77ca2332 OBC |
1619 | iommu_fault_handler_t handler, |
1620 | void *token) | |
4f3f8d9d OBC |
1621 | { |
1622 | BUG_ON(!domain); | |
1623 | ||
1624 | domain->handler = handler; | |
77ca2332 | 1625 | domain->handler_token = token; |
4f3f8d9d | 1626 | } |
30bd918c | 1627 | EXPORT_SYMBOL_GPL(iommu_set_fault_handler); |
4f3f8d9d | 1628 | |
53723dc5 JR |
1629 | static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus, |
1630 | unsigned type) | |
fc2100eb JR |
1631 | { |
1632 | struct iommu_domain *domain; | |
fc2100eb | 1633 | |
94441c3b | 1634 | if (bus == NULL || bus->iommu_ops == NULL) |
905d66c1 JR |
1635 | return NULL; |
1636 | ||
53723dc5 | 1637 | domain = bus->iommu_ops->domain_alloc(type); |
fc2100eb JR |
1638 | if (!domain) |
1639 | return NULL; | |
1640 | ||
8539c7c1 | 1641 | domain->ops = bus->iommu_ops; |
53723dc5 | 1642 | domain->type = type; |
d16e0faa RM |
1643 | /* Assume all sizes by default; the driver may override this later */ |
1644 | domain->pgsize_bitmap = bus->iommu_ops->pgsize_bitmap; | |
905d66c1 | 1645 | |
fc2100eb | 1646 | return domain; |
fc2100eb | 1647 | } |
fc2100eb | 1648 | |
53723dc5 JR |
1649 | struct iommu_domain *iommu_domain_alloc(struct bus_type *bus) |
1650 | { | |
1651 | return __iommu_domain_alloc(bus, IOMMU_DOMAIN_UNMANAGED); | |
fc2100eb JR |
1652 | } |
1653 | EXPORT_SYMBOL_GPL(iommu_domain_alloc); | |
1654 | ||
1655 | void iommu_domain_free(struct iommu_domain *domain) | |
1656 | { | |
89be34a1 | 1657 | domain->ops->domain_free(domain); |
fc2100eb JR |
1658 | } |
1659 | EXPORT_SYMBOL_GPL(iommu_domain_free); | |
1660 | ||
426a2738 JR |
1661 | static int __iommu_attach_device(struct iommu_domain *domain, |
1662 | struct device *dev) | |
fc2100eb | 1663 | { |
b54db778 | 1664 | int ret; |
e01d1913 | 1665 | |
e5aa7f00 JR |
1666 | if (unlikely(domain->ops->attach_dev == NULL)) |
1667 | return -ENODEV; | |
1668 | ||
b54db778 SK |
1669 | ret = domain->ops->attach_dev(domain, dev); |
1670 | if (!ret) | |
1671 | trace_attach_device_to_domain(dev); | |
1672 | return ret; | |
fc2100eb | 1673 | } |
426a2738 JR |
1674 | |
1675 | int iommu_attach_device(struct iommu_domain *domain, struct device *dev) | |
1676 | { | |
1677 | struct iommu_group *group; | |
1678 | int ret; | |
1679 | ||
1680 | group = iommu_group_get(dev); | |
9ae9df03 JC |
1681 | if (!group) |
1682 | return -ENODEV; | |
1683 | ||
426a2738 | 1684 | /* |
05f80300 | 1685 | * Lock the group to make sure the device-count doesn't |
426a2738 JR |
1686 | * change while we are attaching |
1687 | */ | |
1688 | mutex_lock(&group->mutex); | |
1689 | ret = -EINVAL; | |
1690 | if (iommu_group_device_count(group) != 1) | |
1691 | goto out_unlock; | |
1692 | ||
e39cb8a3 | 1693 | ret = __iommu_attach_group(domain, group); |
426a2738 JR |
1694 | |
1695 | out_unlock: | |
1696 | mutex_unlock(&group->mutex); | |
1697 | iommu_group_put(group); | |
1698 | ||
1699 | return ret; | |
1700 | } | |
fc2100eb JR |
1701 | EXPORT_SYMBOL_GPL(iommu_attach_device); |
1702 | ||
4c7c171f YL |
1703 | int iommu_cache_invalidate(struct iommu_domain *domain, struct device *dev, |
1704 | struct iommu_cache_invalidate_info *inv_info) | |
1705 | { | |
1706 | if (unlikely(!domain->ops->cache_invalidate)) | |
1707 | return -ENODEV; | |
1708 | ||
1709 | return domain->ops->cache_invalidate(domain, dev, inv_info); | |
1710 | } | |
1711 | EXPORT_SYMBOL_GPL(iommu_cache_invalidate); | |
1712 | ||
808be0aa JP |
1713 | int iommu_sva_bind_gpasid(struct iommu_domain *domain, |
1714 | struct device *dev, struct iommu_gpasid_bind_data *data) | |
1715 | { | |
1716 | if (unlikely(!domain->ops->sva_bind_gpasid)) | |
1717 | return -ENODEV; | |
1718 | ||
1719 | return domain->ops->sva_bind_gpasid(domain, dev, data); | |
1720 | } | |
1721 | EXPORT_SYMBOL_GPL(iommu_sva_bind_gpasid); | |
1722 | ||
1723 | int iommu_sva_unbind_gpasid(struct iommu_domain *domain, struct device *dev, | |
1724 | ioasid_t pasid) | |
1725 | { | |
1726 | if (unlikely(!domain->ops->sva_unbind_gpasid)) | |
1727 | return -ENODEV; | |
1728 | ||
1729 | return domain->ops->sva_unbind_gpasid(dev, pasid); | |
1730 | } | |
1731 | EXPORT_SYMBOL_GPL(iommu_sva_unbind_gpasid); | |
1732 | ||
426a2738 JR |
1733 | static void __iommu_detach_device(struct iommu_domain *domain, |
1734 | struct device *dev) | |
fc2100eb | 1735 | { |
bd421264 | 1736 | if (iommu_is_attach_deferred(domain, dev)) |
e01d1913 BH |
1737 | return; |
1738 | ||
e5aa7f00 JR |
1739 | if (unlikely(domain->ops->detach_dev == NULL)) |
1740 | return; | |
1741 | ||
1742 | domain->ops->detach_dev(domain, dev); | |
69980630 | 1743 | trace_detach_device_from_domain(dev); |
fc2100eb | 1744 | } |
426a2738 JR |
1745 | |
1746 | void iommu_detach_device(struct iommu_domain *domain, struct device *dev) | |
1747 | { | |
1748 | struct iommu_group *group; | |
1749 | ||
1750 | group = iommu_group_get(dev); | |
9ae9df03 JC |
1751 | if (!group) |
1752 | return; | |
426a2738 JR |
1753 | |
1754 | mutex_lock(&group->mutex); | |
1755 | if (iommu_group_device_count(group) != 1) { | |
1756 | WARN_ON(1); | |
1757 | goto out_unlock; | |
1758 | } | |
1759 | ||
e39cb8a3 | 1760 | __iommu_detach_group(domain, group); |
426a2738 JR |
1761 | |
1762 | out_unlock: | |
1763 | mutex_unlock(&group->mutex); | |
1764 | iommu_group_put(group); | |
1765 | } | |
fc2100eb JR |
1766 | EXPORT_SYMBOL_GPL(iommu_detach_device); |
1767 | ||
2c1296d9 JR |
1768 | struct iommu_domain *iommu_get_domain_for_dev(struct device *dev) |
1769 | { | |
1770 | struct iommu_domain *domain; | |
1771 | struct iommu_group *group; | |
1772 | ||
1773 | group = iommu_group_get(dev); | |
1464d0b1 | 1774 | if (!group) |
2c1296d9 JR |
1775 | return NULL; |
1776 | ||
1777 | domain = group->domain; | |
1778 | ||
1779 | iommu_group_put(group); | |
1780 | ||
1781 | return domain; | |
1782 | } | |
1783 | EXPORT_SYMBOL_GPL(iommu_get_domain_for_dev); | |
fc2100eb | 1784 | |
d72e31c9 | 1785 | /* |
6af588fe RM |
1786 | * For IOMMU_DOMAIN_DMA implementations which already provide their own |
1787 | * guarantees that the group and its default domain are valid and correct. | |
1788 | */ | |
1789 | struct iommu_domain *iommu_get_dma_domain(struct device *dev) | |
1790 | { | |
1791 | return dev->iommu_group->default_domain; | |
1792 | } | |
1793 | ||
d72e31c9 | 1794 | /* |
35449adc | 1795 | * IOMMU groups are really the natural working unit of the IOMMU, but |
d72e31c9 AW |
1796 | * the IOMMU API works on domains and devices. Bridge that gap by |
1797 | * iterating over the devices in a group. Ideally we'd have a single | |
1798 | * device which represents the requestor ID of the group, but we also | |
1799 | * allow IOMMU drivers to create policy defined minimum sets, where | |
1800 | * the physical hardware may be able to distiguish members, but we | |
1801 | * wish to group them at a higher level (ex. untrusted multi-function | |
1802 | * PCI devices). Thus we attach each device. | |
1803 | */ | |
1804 | static int iommu_group_do_attach_device(struct device *dev, void *data) | |
1805 | { | |
1806 | struct iommu_domain *domain = data; | |
1807 | ||
426a2738 | 1808 | return __iommu_attach_device(domain, dev); |
d72e31c9 AW |
1809 | } |
1810 | ||
e39cb8a3 JR |
1811 | static int __iommu_attach_group(struct iommu_domain *domain, |
1812 | struct iommu_group *group) | |
1813 | { | |
1814 | int ret; | |
1815 | ||
1816 | if (group->default_domain && group->domain != group->default_domain) | |
1817 | return -EBUSY; | |
1818 | ||
1819 | ret = __iommu_group_for_each_dev(group, domain, | |
1820 | iommu_group_do_attach_device); | |
1821 | if (ret == 0) | |
1822 | group->domain = domain; | |
1823 | ||
1824 | return ret; | |
d72e31c9 AW |
1825 | } |
1826 | ||
1827 | int iommu_attach_group(struct iommu_domain *domain, struct iommu_group *group) | |
1828 | { | |
e39cb8a3 JR |
1829 | int ret; |
1830 | ||
1831 | mutex_lock(&group->mutex); | |
1832 | ret = __iommu_attach_group(domain, group); | |
1833 | mutex_unlock(&group->mutex); | |
1834 | ||
1835 | return ret; | |
d72e31c9 AW |
1836 | } |
1837 | EXPORT_SYMBOL_GPL(iommu_attach_group); | |
1838 | ||
1839 | static int iommu_group_do_detach_device(struct device *dev, void *data) | |
1840 | { | |
1841 | struct iommu_domain *domain = data; | |
1842 | ||
426a2738 | 1843 | __iommu_detach_device(domain, dev); |
d72e31c9 AW |
1844 | |
1845 | return 0; | |
1846 | } | |
1847 | ||
e39cb8a3 JR |
1848 | static void __iommu_detach_group(struct iommu_domain *domain, |
1849 | struct iommu_group *group) | |
1850 | { | |
1851 | int ret; | |
1852 | ||
1853 | if (!group->default_domain) { | |
1854 | __iommu_group_for_each_dev(group, domain, | |
1855 | iommu_group_do_detach_device); | |
1856 | group->domain = NULL; | |
1857 | return; | |
1858 | } | |
1859 | ||
1860 | if (group->domain == group->default_domain) | |
1861 | return; | |
1862 | ||
1863 | /* Detach by re-attaching to the default domain */ | |
1864 | ret = __iommu_group_for_each_dev(group, group->default_domain, | |
1865 | iommu_group_do_attach_device); | |
1866 | if (ret != 0) | |
1867 | WARN_ON(1); | |
1868 | else | |
1869 | group->domain = group->default_domain; | |
1870 | } | |
1871 | ||
d72e31c9 AW |
1872 | void iommu_detach_group(struct iommu_domain *domain, struct iommu_group *group) |
1873 | { | |
e39cb8a3 JR |
1874 | mutex_lock(&group->mutex); |
1875 | __iommu_detach_group(domain, group); | |
1876 | mutex_unlock(&group->mutex); | |
d72e31c9 AW |
1877 | } |
1878 | EXPORT_SYMBOL_GPL(iommu_detach_group); | |
1879 | ||
bb5547ac | 1880 | phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova) |
fc2100eb | 1881 | { |
e5aa7f00 JR |
1882 | if (unlikely(domain->ops->iova_to_phys == NULL)) |
1883 | return 0; | |
1884 | ||
1885 | return domain->ops->iova_to_phys(domain, iova); | |
fc2100eb JR |
1886 | } |
1887 | EXPORT_SYMBOL_GPL(iommu_iova_to_phys); | |
dbb9fd86 | 1888 | |
bd13969b AW |
1889 | static size_t iommu_pgsize(struct iommu_domain *domain, |
1890 | unsigned long addr_merge, size_t size) | |
1891 | { | |
1892 | unsigned int pgsize_idx; | |
1893 | size_t pgsize; | |
1894 | ||
1895 | /* Max page size that still fits into 'size' */ | |
1896 | pgsize_idx = __fls(size); | |
1897 | ||
1898 | /* need to consider alignment requirements ? */ | |
1899 | if (likely(addr_merge)) { | |
1900 | /* Max page size allowed by address */ | |
1901 | unsigned int align_pgsize_idx = __ffs(addr_merge); | |
1902 | pgsize_idx = min(pgsize_idx, align_pgsize_idx); | |
1903 | } | |
1904 | ||
1905 | /* build a mask of acceptable page sizes */ | |
1906 | pgsize = (1UL << (pgsize_idx + 1)) - 1; | |
1907 | ||
1908 | /* throw away page sizes not supported by the hardware */ | |
d16e0faa | 1909 | pgsize &= domain->pgsize_bitmap; |
bd13969b AW |
1910 | |
1911 | /* make sure we're still sane */ | |
1912 | BUG_ON(!pgsize); | |
1913 | ||
1914 | /* pick the biggest page */ | |
1915 | pgsize_idx = __fls(pgsize); | |
1916 | pgsize = 1UL << pgsize_idx; | |
1917 | ||
1918 | return pgsize; | |
1919 | } | |
1920 | ||
781ca2de TM |
1921 | int __iommu_map(struct iommu_domain *domain, unsigned long iova, |
1922 | phys_addr_t paddr, size_t size, int prot, gfp_t gfp) | |
cefc53c7 | 1923 | { |
1d7ae53b | 1924 | const struct iommu_ops *ops = domain->ops; |
7d3002cc OBC |
1925 | unsigned long orig_iova = iova; |
1926 | unsigned int min_pagesz; | |
1927 | size_t orig_size = size; | |
06bfcaa9 | 1928 | phys_addr_t orig_paddr = paddr; |
7d3002cc | 1929 | int ret = 0; |
cefc53c7 | 1930 | |
1d7ae53b | 1931 | if (unlikely(ops->map == NULL || |
d16e0faa | 1932 | domain->pgsize_bitmap == 0UL)) |
e5aa7f00 | 1933 | return -ENODEV; |
cefc53c7 | 1934 | |
a10315e5 JR |
1935 | if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING))) |
1936 | return -EINVAL; | |
1937 | ||
7d3002cc | 1938 | /* find out the minimum page size supported */ |
d16e0faa | 1939 | min_pagesz = 1 << __ffs(domain->pgsize_bitmap); |
7d3002cc OBC |
1940 | |
1941 | /* | |
1942 | * both the virtual address and the physical one, as well as | |
1943 | * the size of the mapping, must be aligned (at least) to the | |
1944 | * size of the smallest page supported by the hardware | |
1945 | */ | |
1946 | if (!IS_ALIGNED(iova | paddr | size, min_pagesz)) { | |
abedb049 | 1947 | pr_err("unaligned: iova 0x%lx pa %pa size 0x%zx min_pagesz 0x%x\n", |
6197ca82 | 1948 | iova, &paddr, size, min_pagesz); |
7d3002cc OBC |
1949 | return -EINVAL; |
1950 | } | |
1951 | ||
abedb049 | 1952 | pr_debug("map: iova 0x%lx pa %pa size 0x%zx\n", iova, &paddr, size); |
7d3002cc OBC |
1953 | |
1954 | while (size) { | |
bd13969b | 1955 | size_t pgsize = iommu_pgsize(domain, iova | paddr, size); |
7d3002cc | 1956 | |
abedb049 | 1957 | pr_debug("mapping: iova 0x%lx pa %pa pgsize 0x%zx\n", |
6197ca82 | 1958 | iova, &paddr, pgsize); |
781ca2de | 1959 | ret = ops->map(domain, iova, paddr, pgsize, prot, gfp); |
7d3002cc | 1960 | |
7d3002cc OBC |
1961 | if (ret) |
1962 | break; | |
1963 | ||
1964 | iova += pgsize; | |
1965 | paddr += pgsize; | |
1966 | size -= pgsize; | |
1967 | } | |
1968 | ||
1d7ae53b DO |
1969 | if (ops->iotlb_sync_map) |
1970 | ops->iotlb_sync_map(domain); | |
1971 | ||
7d3002cc OBC |
1972 | /* unroll mapping in case something went wrong */ |
1973 | if (ret) | |
1974 | iommu_unmap(domain, orig_iova, orig_size - size); | |
e0be7c86 | 1975 | else |
06bfcaa9 | 1976 | trace_map(orig_iova, orig_paddr, orig_size); |
7d3002cc OBC |
1977 | |
1978 | return ret; | |
cefc53c7 | 1979 | } |
781ca2de TM |
1980 | |
1981 | int iommu_map(struct iommu_domain *domain, unsigned long iova, | |
1982 | phys_addr_t paddr, size_t size, int prot) | |
1983 | { | |
1984 | might_sleep(); | |
1985 | return __iommu_map(domain, iova, paddr, size, prot, GFP_KERNEL); | |
1986 | } | |
cefc53c7 JR |
1987 | EXPORT_SYMBOL_GPL(iommu_map); |
1988 | ||
781ca2de TM |
1989 | int iommu_map_atomic(struct iommu_domain *domain, unsigned long iova, |
1990 | phys_addr_t paddr, size_t size, int prot) | |
1991 | { | |
1992 | return __iommu_map(domain, iova, paddr, size, prot, GFP_ATOMIC); | |
1993 | } | |
1994 | EXPORT_SYMBOL_GPL(iommu_map_atomic); | |
1995 | ||
add02cfd JR |
1996 | static size_t __iommu_unmap(struct iommu_domain *domain, |
1997 | unsigned long iova, size_t size, | |
a7d20dc1 | 1998 | struct iommu_iotlb_gather *iotlb_gather) |
cefc53c7 | 1999 | { |
add02cfd | 2000 | const struct iommu_ops *ops = domain->ops; |
7d3002cc | 2001 | size_t unmapped_page, unmapped = 0; |
6fd492fd | 2002 | unsigned long orig_iova = iova; |
add02cfd | 2003 | unsigned int min_pagesz; |
cefc53c7 | 2004 | |
add02cfd | 2005 | if (unlikely(ops->unmap == NULL || |
d16e0faa | 2006 | domain->pgsize_bitmap == 0UL)) |
c5611a87 | 2007 | return 0; |
e5aa7f00 | 2008 | |
a10315e5 | 2009 | if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING))) |
c5611a87 | 2010 | return 0; |
a10315e5 | 2011 | |
7d3002cc | 2012 | /* find out the minimum page size supported */ |
d16e0faa | 2013 | min_pagesz = 1 << __ffs(domain->pgsize_bitmap); |
7d3002cc OBC |
2014 | |
2015 | /* | |
2016 | * The virtual address, as well as the size of the mapping, must be | |
2017 | * aligned (at least) to the size of the smallest page supported | |
2018 | * by the hardware | |
2019 | */ | |
2020 | if (!IS_ALIGNED(iova | size, min_pagesz)) { | |
6197ca82 JP |
2021 | pr_err("unaligned: iova 0x%lx size 0x%zx min_pagesz 0x%x\n", |
2022 | iova, size, min_pagesz); | |
c5611a87 | 2023 | return 0; |
7d3002cc OBC |
2024 | } |
2025 | ||
6197ca82 | 2026 | pr_debug("unmap this: iova 0x%lx size 0x%zx\n", iova, size); |
7d3002cc OBC |
2027 | |
2028 | /* | |
2029 | * Keep iterating until we either unmap 'size' bytes (or more) | |
2030 | * or we hit an area that isn't mapped. | |
2031 | */ | |
2032 | while (unmapped < size) { | |
bd13969b | 2033 | size_t pgsize = iommu_pgsize(domain, iova, size - unmapped); |
7d3002cc | 2034 | |
56f8af5e | 2035 | unmapped_page = ops->unmap(domain, iova, pgsize, iotlb_gather); |
7d3002cc OBC |
2036 | if (!unmapped_page) |
2037 | break; | |
2038 | ||
6197ca82 JP |
2039 | pr_debug("unmapped: iova 0x%lx size 0x%zx\n", |
2040 | iova, unmapped_page); | |
7d3002cc OBC |
2041 | |
2042 | iova += unmapped_page; | |
2043 | unmapped += unmapped_page; | |
2044 | } | |
2045 | ||
db8614d3 | 2046 | trace_unmap(orig_iova, size, unmapped); |
7d3002cc | 2047 | return unmapped; |
cefc53c7 | 2048 | } |
add02cfd JR |
2049 | |
2050 | size_t iommu_unmap(struct iommu_domain *domain, | |
2051 | unsigned long iova, size_t size) | |
2052 | { | |
a7d20dc1 WD |
2053 | struct iommu_iotlb_gather iotlb_gather; |
2054 | size_t ret; | |
2055 | ||
2056 | iommu_iotlb_gather_init(&iotlb_gather); | |
2057 | ret = __iommu_unmap(domain, iova, size, &iotlb_gather); | |
2058 | iommu_tlb_sync(domain, &iotlb_gather); | |
2059 | ||
2060 | return ret; | |
add02cfd | 2061 | } |
cefc53c7 | 2062 | EXPORT_SYMBOL_GPL(iommu_unmap); |
1460432c | 2063 | |
add02cfd | 2064 | size_t iommu_unmap_fast(struct iommu_domain *domain, |
a7d20dc1 WD |
2065 | unsigned long iova, size_t size, |
2066 | struct iommu_iotlb_gather *iotlb_gather) | |
add02cfd | 2067 | { |
a7d20dc1 | 2068 | return __iommu_unmap(domain, iova, size, iotlb_gather); |
add02cfd JR |
2069 | } |
2070 | EXPORT_SYMBOL_GPL(iommu_unmap_fast); | |
2071 | ||
781ca2de TM |
2072 | size_t __iommu_map_sg(struct iommu_domain *domain, unsigned long iova, |
2073 | struct scatterlist *sg, unsigned int nents, int prot, | |
2074 | gfp_t gfp) | |
315786eb | 2075 | { |
5d95f40e RM |
2076 | size_t len = 0, mapped = 0; |
2077 | phys_addr_t start; | |
2078 | unsigned int i = 0; | |
38ec010d | 2079 | int ret; |
315786eb | 2080 | |
5d95f40e RM |
2081 | while (i <= nents) { |
2082 | phys_addr_t s_phys = sg_phys(sg); | |
18f23409 | 2083 | |
5d95f40e | 2084 | if (len && s_phys != start + len) { |
781ca2de TM |
2085 | ret = __iommu_map(domain, iova + mapped, start, |
2086 | len, prot, gfp); | |
2087 | ||
5d95f40e RM |
2088 | if (ret) |
2089 | goto out_err; | |
18f23409 | 2090 | |
5d95f40e RM |
2091 | mapped += len; |
2092 | len = 0; | |
2093 | } | |
38ec010d | 2094 | |
5d95f40e RM |
2095 | if (len) { |
2096 | len += sg->length; | |
2097 | } else { | |
2098 | len = sg->length; | |
2099 | start = s_phys; | |
2100 | } | |
38ec010d | 2101 | |
5d95f40e RM |
2102 | if (++i < nents) |
2103 | sg = sg_next(sg); | |
315786eb OH |
2104 | } |
2105 | ||
2106 | return mapped; | |
38ec010d JR |
2107 | |
2108 | out_err: | |
2109 | /* undo mappings already done */ | |
2110 | iommu_unmap(domain, iova, mapped); | |
2111 | ||
2112 | return 0; | |
2113 | ||
315786eb | 2114 | } |
781ca2de TM |
2115 | |
2116 | size_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova, | |
2117 | struct scatterlist *sg, unsigned int nents, int prot) | |
2118 | { | |
2119 | might_sleep(); | |
2120 | return __iommu_map_sg(domain, iova, sg, nents, prot, GFP_KERNEL); | |
2121 | } | |
d88e61fa | 2122 | EXPORT_SYMBOL_GPL(iommu_map_sg); |
d7787d57 | 2123 | |
781ca2de TM |
2124 | size_t iommu_map_sg_atomic(struct iommu_domain *domain, unsigned long iova, |
2125 | struct scatterlist *sg, unsigned int nents, int prot) | |
2126 | { | |
2127 | return __iommu_map_sg(domain, iova, sg, nents, prot, GFP_ATOMIC); | |
2128 | } | |
2129 | EXPORT_SYMBOL_GPL(iommu_map_sg_atomic); | |
2130 | ||
d7787d57 | 2131 | int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr, |
80f97f0f | 2132 | phys_addr_t paddr, u64 size, int prot) |
d7787d57 JR |
2133 | { |
2134 | if (unlikely(domain->ops->domain_window_enable == NULL)) | |
2135 | return -ENODEV; | |
2136 | ||
80f97f0f VS |
2137 | return domain->ops->domain_window_enable(domain, wnd_nr, paddr, size, |
2138 | prot); | |
d7787d57 JR |
2139 | } |
2140 | EXPORT_SYMBOL_GPL(iommu_domain_window_enable); | |
2141 | ||
2142 | void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr) | |
2143 | { | |
2144 | if (unlikely(domain->ops->domain_window_disable == NULL)) | |
2145 | return; | |
2146 | ||
2147 | return domain->ops->domain_window_disable(domain, wnd_nr); | |
2148 | } | |
2149 | EXPORT_SYMBOL_GPL(iommu_domain_window_disable); | |
2150 | ||
207c6e36 JR |
2151 | /** |
2152 | * report_iommu_fault() - report about an IOMMU fault to the IOMMU framework | |
2153 | * @domain: the iommu domain where the fault has happened | |
2154 | * @dev: the device where the fault has happened | |
2155 | * @iova: the faulting address | |
2156 | * @flags: mmu fault flags (e.g. IOMMU_FAULT_READ/IOMMU_FAULT_WRITE/...) | |
2157 | * | |
2158 | * This function should be called by the low-level IOMMU implementations | |
2159 | * whenever IOMMU faults happen, to allow high-level users, that are | |
2160 | * interested in such events, to know about them. | |
2161 | * | |
2162 | * This event may be useful for several possible use cases: | |
2163 | * - mere logging of the event | |
2164 | * - dynamic TLB/PTE loading | |
2165 | * - if restarting of the faulting device is required | |
2166 | * | |
2167 | * Returns 0 on success and an appropriate error code otherwise (if dynamic | |
2168 | * PTE/TLB loading will one day be supported, implementations will be able | |
2169 | * to tell whether it succeeded or not according to this return value). | |
2170 | * | |
2171 | * Specifically, -ENOSYS is returned if a fault handler isn't installed | |
2172 | * (though fault handlers can also return -ENOSYS, in case they want to | |
2173 | * elicit the default behavior of the IOMMU drivers). | |
2174 | */ | |
2175 | int report_iommu_fault(struct iommu_domain *domain, struct device *dev, | |
2176 | unsigned long iova, int flags) | |
2177 | { | |
2178 | int ret = -ENOSYS; | |
2179 | ||
2180 | /* | |
2181 | * if upper layers showed interest and installed a fault handler, | |
2182 | * invoke it. | |
2183 | */ | |
2184 | if (domain->handler) | |
2185 | ret = domain->handler(domain, dev, iova, flags, | |
2186 | domain->handler_token); | |
2187 | ||
2188 | trace_io_page_fault(dev, iova, flags); | |
2189 | return ret; | |
2190 | } | |
2191 | EXPORT_SYMBOL_GPL(report_iommu_fault); | |
2192 | ||
d72e31c9 | 2193 | static int __init iommu_init(void) |
1460432c | 2194 | { |
d72e31c9 AW |
2195 | iommu_group_kset = kset_create_and_add("iommu_groups", |
2196 | NULL, kernel_kobj); | |
d72e31c9 AW |
2197 | BUG_ON(!iommu_group_kset); |
2198 | ||
bad614b2 GH |
2199 | iommu_debugfs_setup(); |
2200 | ||
d72e31c9 | 2201 | return 0; |
1460432c | 2202 | } |
d7ef9995 | 2203 | core_initcall(iommu_init); |
0cd76dd1 JR |
2204 | |
2205 | int iommu_domain_get_attr(struct iommu_domain *domain, | |
2206 | enum iommu_attr attr, void *data) | |
2207 | { | |
0ff64f80 | 2208 | struct iommu_domain_geometry *geometry; |
d2e12160 | 2209 | bool *paging; |
0ff64f80 JR |
2210 | int ret = 0; |
2211 | ||
2212 | switch (attr) { | |
2213 | case DOMAIN_ATTR_GEOMETRY: | |
2214 | geometry = data; | |
2215 | *geometry = domain->geometry; | |
2216 | ||
d2e12160 JR |
2217 | break; |
2218 | case DOMAIN_ATTR_PAGING: | |
2219 | paging = data; | |
d16e0faa | 2220 | *paging = (domain->pgsize_bitmap != 0UL); |
0ff64f80 JR |
2221 | break; |
2222 | default: | |
2223 | if (!domain->ops->domain_get_attr) | |
2224 | return -EINVAL; | |
0cd76dd1 | 2225 | |
0ff64f80 JR |
2226 | ret = domain->ops->domain_get_attr(domain, attr, data); |
2227 | } | |
2228 | ||
2229 | return ret; | |
0cd76dd1 JR |
2230 | } |
2231 | EXPORT_SYMBOL_GPL(iommu_domain_get_attr); | |
2232 | ||
2233 | int iommu_domain_set_attr(struct iommu_domain *domain, | |
2234 | enum iommu_attr attr, void *data) | |
2235 | { | |
69356712 | 2236 | int ret = 0; |
69356712 JR |
2237 | |
2238 | switch (attr) { | |
69356712 JR |
2239 | default: |
2240 | if (domain->ops->domain_set_attr == NULL) | |
2241 | return -EINVAL; | |
2242 | ||
2243 | ret = domain->ops->domain_set_attr(domain, attr, data); | |
2244 | } | |
2245 | ||
2246 | return ret; | |
1460432c | 2247 | } |
0cd76dd1 | 2248 | EXPORT_SYMBOL_GPL(iommu_domain_set_attr); |
a1015c2b | 2249 | |
e5b5234a | 2250 | void iommu_get_resv_regions(struct device *dev, struct list_head *list) |
a1015c2b JR |
2251 | { |
2252 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
2253 | ||
e5b5234a EA |
2254 | if (ops && ops->get_resv_regions) |
2255 | ops->get_resv_regions(dev, list); | |
a1015c2b JR |
2256 | } |
2257 | ||
e5b5234a | 2258 | void iommu_put_resv_regions(struct device *dev, struct list_head *list) |
a1015c2b JR |
2259 | { |
2260 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
2261 | ||
e5b5234a EA |
2262 | if (ops && ops->put_resv_regions) |
2263 | ops->put_resv_regions(dev, list); | |
a1015c2b | 2264 | } |
d290f1e7 | 2265 | |
f9f6971e TR |
2266 | /** |
2267 | * generic_iommu_put_resv_regions - Reserved region driver helper | |
2268 | * @dev: device for which to free reserved regions | |
2269 | * @list: reserved region list for device | |
2270 | * | |
2271 | * IOMMU drivers can use this to implement their .put_resv_regions() callback | |
2272 | * for simple reservations. Memory allocated for each reserved region will be | |
2273 | * freed. If an IOMMU driver allocates additional resources per region, it is | |
2274 | * going to have to implement a custom callback. | |
2275 | */ | |
2276 | void generic_iommu_put_resv_regions(struct device *dev, struct list_head *list) | |
2277 | { | |
2278 | struct iommu_resv_region *entry, *next; | |
2279 | ||
2280 | list_for_each_entry_safe(entry, next, list, list) | |
2281 | kfree(entry); | |
2282 | } | |
2283 | EXPORT_SYMBOL(generic_iommu_put_resv_regions); | |
2284 | ||
2b20cbba | 2285 | struct iommu_resv_region *iommu_alloc_resv_region(phys_addr_t start, |
9d3a4de4 RM |
2286 | size_t length, int prot, |
2287 | enum iommu_resv_type type) | |
2b20cbba EA |
2288 | { |
2289 | struct iommu_resv_region *region; | |
2290 | ||
2291 | region = kzalloc(sizeof(*region), GFP_KERNEL); | |
2292 | if (!region) | |
2293 | return NULL; | |
2294 | ||
2295 | INIT_LIST_HEAD(®ion->list); | |
2296 | region->start = start; | |
2297 | region->length = length; | |
2298 | region->prot = prot; | |
2299 | region->type = type; | |
2300 | return region; | |
a1015c2b | 2301 | } |
a7ba5c3d | 2302 | EXPORT_SYMBOL_GPL(iommu_alloc_resv_region); |
d290f1e7 | 2303 | |
7423e017 LB |
2304 | static int |
2305 | request_default_domain_for_dev(struct device *dev, unsigned long type) | |
d290f1e7 | 2306 | { |
7423e017 | 2307 | struct iommu_domain *domain; |
d290f1e7 JR |
2308 | struct iommu_group *group; |
2309 | int ret; | |
2310 | ||
2311 | /* Device must already be in a group before calling this function */ | |
57274ea2 LB |
2312 | group = iommu_group_get(dev); |
2313 | if (!group) | |
2314 | return -EINVAL; | |
d290f1e7 JR |
2315 | |
2316 | mutex_lock(&group->mutex); | |
2317 | ||
d290f1e7 | 2318 | ret = 0; |
7423e017 | 2319 | if (group->default_domain && group->default_domain->type == type) |
d290f1e7 JR |
2320 | goto out; |
2321 | ||
2322 | /* Don't change mappings of existing devices */ | |
2323 | ret = -EBUSY; | |
2324 | if (iommu_group_device_count(group) != 1) | |
2325 | goto out; | |
2326 | ||
d290f1e7 | 2327 | ret = -ENOMEM; |
7423e017 LB |
2328 | domain = __iommu_domain_alloc(dev->bus, type); |
2329 | if (!domain) | |
d290f1e7 JR |
2330 | goto out; |
2331 | ||
2332 | /* Attach the device to the domain */ | |
7423e017 | 2333 | ret = __iommu_attach_group(domain, group); |
d290f1e7 | 2334 | if (ret) { |
7423e017 | 2335 | iommu_domain_free(domain); |
d290f1e7 JR |
2336 | goto out; |
2337 | } | |
2338 | ||
d127bc9b | 2339 | /* Make the domain the default for this group */ |
d290f1e7 JR |
2340 | if (group->default_domain) |
2341 | iommu_domain_free(group->default_domain); | |
7423e017 | 2342 | group->default_domain = domain; |
d290f1e7 | 2343 | |
d3602115 JS |
2344 | iommu_group_create_direct_mappings(group, dev); |
2345 | ||
7423e017 LB |
2346 | dev_info(dev, "Using iommu %s mapping\n", |
2347 | type == IOMMU_DOMAIN_DMA ? "dma" : "direct"); | |
d290f1e7 JR |
2348 | |
2349 | ret = 0; | |
2350 | out: | |
2351 | mutex_unlock(&group->mutex); | |
2352 | iommu_group_put(group); | |
2353 | ||
2354 | return ret; | |
2355 | } | |
57f98d2f | 2356 | |
7423e017 LB |
2357 | /* Request that a device is direct mapped by the IOMMU */ |
2358 | int iommu_request_dm_for_dev(struct device *dev) | |
2359 | { | |
2360 | return request_default_domain_for_dev(dev, IOMMU_DOMAIN_IDENTITY); | |
2361 | } | |
2362 | ||
2363 | /* Request that a device can't be direct mapped by the IOMMU */ | |
2364 | int iommu_request_dma_domain_for_dev(struct device *dev) | |
2365 | { | |
2366 | return request_default_domain_for_dev(dev, IOMMU_DOMAIN_DMA); | |
2367 | } | |
2368 | ||
8a69961c JR |
2369 | void iommu_set_default_passthrough(bool cmd_line) |
2370 | { | |
2371 | if (cmd_line) | |
2372 | iommu_set_cmd_line_dma_api(); | |
2373 | ||
2374 | iommu_def_domain_type = IOMMU_DOMAIN_IDENTITY; | |
2375 | } | |
2376 | ||
2377 | void iommu_set_default_translated(bool cmd_line) | |
2378 | { | |
2379 | if (cmd_line) | |
2380 | iommu_set_cmd_line_dma_api(); | |
2381 | ||
2382 | iommu_def_domain_type = IOMMU_DOMAIN_DMA; | |
2383 | } | |
2384 | ||
2385 | bool iommu_default_passthrough(void) | |
2386 | { | |
2387 | return iommu_def_domain_type == IOMMU_DOMAIN_IDENTITY; | |
2388 | } | |
2389 | EXPORT_SYMBOL_GPL(iommu_default_passthrough); | |
2390 | ||
534766df | 2391 | const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode) |
e4f10ffe | 2392 | { |
e4f10ffe | 2393 | const struct iommu_ops *ops = NULL; |
d0f6f583 | 2394 | struct iommu_device *iommu; |
e4f10ffe | 2395 | |
d0f6f583 JR |
2396 | spin_lock(&iommu_device_lock); |
2397 | list_for_each_entry(iommu, &iommu_device_list, list) | |
2398 | if (iommu->fwnode == fwnode) { | |
2399 | ops = iommu->ops; | |
e4f10ffe LP |
2400 | break; |
2401 | } | |
d0f6f583 | 2402 | spin_unlock(&iommu_device_lock); |
e4f10ffe LP |
2403 | return ops; |
2404 | } | |
2405 | ||
57f98d2f RM |
2406 | int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode, |
2407 | const struct iommu_ops *ops) | |
2408 | { | |
b4ef725e | 2409 | struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); |
57f98d2f RM |
2410 | |
2411 | if (fwspec) | |
2412 | return ops == fwspec->ops ? 0 : -EINVAL; | |
2413 | ||
72acd9df JR |
2414 | if (!dev_iommu_get(dev)) |
2415 | return -ENOMEM; | |
2416 | ||
098accf2 RM |
2417 | /* Preallocate for the overwhelmingly common case of 1 ID */ |
2418 | fwspec = kzalloc(struct_size(fwspec, ids, 1), GFP_KERNEL); | |
57f98d2f RM |
2419 | if (!fwspec) |
2420 | return -ENOMEM; | |
2421 | ||
2422 | of_node_get(to_of_node(iommu_fwnode)); | |
2423 | fwspec->iommu_fwnode = iommu_fwnode; | |
2424 | fwspec->ops = ops; | |
b4ef725e | 2425 | dev_iommu_fwspec_set(dev, fwspec); |
57f98d2f RM |
2426 | return 0; |
2427 | } | |
2428 | EXPORT_SYMBOL_GPL(iommu_fwspec_init); | |
2429 | ||
2430 | void iommu_fwspec_free(struct device *dev) | |
2431 | { | |
b4ef725e | 2432 | struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); |
57f98d2f RM |
2433 | |
2434 | if (fwspec) { | |
2435 | fwnode_handle_put(fwspec->iommu_fwnode); | |
2436 | kfree(fwspec); | |
b4ef725e | 2437 | dev_iommu_fwspec_set(dev, NULL); |
57f98d2f RM |
2438 | } |
2439 | } | |
2440 | EXPORT_SYMBOL_GPL(iommu_fwspec_free); | |
2441 | ||
2442 | int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids) | |
2443 | { | |
b4ef725e | 2444 | struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); |
098accf2 | 2445 | int i, new_num; |
57f98d2f RM |
2446 | |
2447 | if (!fwspec) | |
2448 | return -EINVAL; | |
2449 | ||
098accf2 RM |
2450 | new_num = fwspec->num_ids + num_ids; |
2451 | if (new_num > 1) { | |
2452 | fwspec = krealloc(fwspec, struct_size(fwspec, ids, new_num), | |
2453 | GFP_KERNEL); | |
57f98d2f RM |
2454 | if (!fwspec) |
2455 | return -ENOMEM; | |
909111ba | 2456 | |
b4ef725e | 2457 | dev_iommu_fwspec_set(dev, fwspec); |
57f98d2f RM |
2458 | } |
2459 | ||
2460 | for (i = 0; i < num_ids; i++) | |
2461 | fwspec->ids[fwspec->num_ids + i] = ids[i]; | |
2462 | ||
098accf2 | 2463 | fwspec->num_ids = new_num; |
57f98d2f RM |
2464 | return 0; |
2465 | } | |
2466 | EXPORT_SYMBOL_GPL(iommu_fwspec_add_ids); | |
a3a19592 LB |
2467 | |
2468 | /* | |
2469 | * Per device IOMMU features. | |
2470 | */ | |
2471 | bool iommu_dev_has_feature(struct device *dev, enum iommu_dev_features feat) | |
2472 | { | |
2473 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
2474 | ||
2475 | if (ops && ops->dev_has_feat) | |
2476 | return ops->dev_has_feat(dev, feat); | |
2477 | ||
2478 | return false; | |
2479 | } | |
2480 | EXPORT_SYMBOL_GPL(iommu_dev_has_feature); | |
2481 | ||
2482 | int iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features feat) | |
2483 | { | |
2484 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
2485 | ||
2486 | if (ops && ops->dev_enable_feat) | |
2487 | return ops->dev_enable_feat(dev, feat); | |
2488 | ||
2489 | return -ENODEV; | |
2490 | } | |
2491 | EXPORT_SYMBOL_GPL(iommu_dev_enable_feature); | |
2492 | ||
2493 | /* | |
2494 | * The device drivers should do the necessary cleanups before calling this. | |
2495 | * For example, before disabling the aux-domain feature, the device driver | |
2496 | * should detach all aux-domains. Otherwise, this will return -EBUSY. | |
2497 | */ | |
2498 | int iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features feat) | |
2499 | { | |
2500 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
2501 | ||
2502 | if (ops && ops->dev_disable_feat) | |
2503 | return ops->dev_disable_feat(dev, feat); | |
2504 | ||
2505 | return -EBUSY; | |
2506 | } | |
2507 | EXPORT_SYMBOL_GPL(iommu_dev_disable_feature); | |
2508 | ||
2509 | bool iommu_dev_feature_enabled(struct device *dev, enum iommu_dev_features feat) | |
2510 | { | |
2511 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
2512 | ||
2513 | if (ops && ops->dev_feat_enabled) | |
2514 | return ops->dev_feat_enabled(dev, feat); | |
2515 | ||
2516 | return false; | |
2517 | } | |
2518 | EXPORT_SYMBOL_GPL(iommu_dev_feature_enabled); | |
2519 | ||
2520 | /* | |
2521 | * Aux-domain specific attach/detach. | |
2522 | * | |
2523 | * Only works if iommu_dev_feature_enabled(dev, IOMMU_DEV_FEAT_AUX) returns | |
2524 | * true. Also, as long as domains are attached to a device through this | |
2525 | * interface, any tries to call iommu_attach_device() should fail | |
2526 | * (iommu_detach_device() can't fail, so we fail when trying to re-attach). | |
2527 | * This should make us safe against a device being attached to a guest as a | |
2528 | * whole while there are still pasid users on it (aux and sva). | |
2529 | */ | |
2530 | int iommu_aux_attach_device(struct iommu_domain *domain, struct device *dev) | |
2531 | { | |
2532 | int ret = -ENODEV; | |
2533 | ||
2534 | if (domain->ops->aux_attach_dev) | |
2535 | ret = domain->ops->aux_attach_dev(domain, dev); | |
2536 | ||
2537 | if (!ret) | |
2538 | trace_attach_device_to_domain(dev); | |
2539 | ||
2540 | return ret; | |
2541 | } | |
2542 | EXPORT_SYMBOL_GPL(iommu_aux_attach_device); | |
2543 | ||
2544 | void iommu_aux_detach_device(struct iommu_domain *domain, struct device *dev) | |
2545 | { | |
2546 | if (domain->ops->aux_detach_dev) { | |
2547 | domain->ops->aux_detach_dev(domain, dev); | |
2548 | trace_detach_device_from_domain(dev); | |
2549 | } | |
2550 | } | |
2551 | EXPORT_SYMBOL_GPL(iommu_aux_detach_device); | |
2552 | ||
2553 | int iommu_aux_get_pasid(struct iommu_domain *domain, struct device *dev) | |
2554 | { | |
2555 | int ret = -ENODEV; | |
2556 | ||
2557 | if (domain->ops->aux_get_pasid) | |
2558 | ret = domain->ops->aux_get_pasid(domain, dev); | |
2559 | ||
2560 | return ret; | |
2561 | } | |
2562 | EXPORT_SYMBOL_GPL(iommu_aux_get_pasid); | |
26b25a2b JPB |
2563 | |
2564 | /** | |
2565 | * iommu_sva_bind_device() - Bind a process address space to a device | |
2566 | * @dev: the device | |
2567 | * @mm: the mm to bind, caller must hold a reference to it | |
2568 | * | |
2569 | * Create a bond between device and address space, allowing the device to access | |
2570 | * the mm using the returned PASID. If a bond already exists between @device and | |
2571 | * @mm, it is returned and an additional reference is taken. Caller must call | |
2572 | * iommu_sva_unbind_device() to release each reference. | |
2573 | * | |
2574 | * iommu_dev_enable_feature(dev, IOMMU_DEV_FEAT_SVA) must be called first, to | |
2575 | * initialize the required SVA features. | |
2576 | * | |
2577 | * On error, returns an ERR_PTR value. | |
2578 | */ | |
2579 | struct iommu_sva * | |
2580 | iommu_sva_bind_device(struct device *dev, struct mm_struct *mm, void *drvdata) | |
2581 | { | |
2582 | struct iommu_group *group; | |
2583 | struct iommu_sva *handle = ERR_PTR(-EINVAL); | |
2584 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
2585 | ||
2586 | if (!ops || !ops->sva_bind) | |
2587 | return ERR_PTR(-ENODEV); | |
2588 | ||
2589 | group = iommu_group_get(dev); | |
2590 | if (!group) | |
2591 | return ERR_PTR(-ENODEV); | |
2592 | ||
2593 | /* Ensure device count and domain don't change while we're binding */ | |
2594 | mutex_lock(&group->mutex); | |
2595 | ||
2596 | /* | |
2597 | * To keep things simple, SVA currently doesn't support IOMMU groups | |
2598 | * with more than one device. Existing SVA-capable systems are not | |
2599 | * affected by the problems that required IOMMU groups (lack of ACS | |
2600 | * isolation, device ID aliasing and other hardware issues). | |
2601 | */ | |
2602 | if (iommu_group_device_count(group) != 1) | |
2603 | goto out_unlock; | |
2604 | ||
2605 | handle = ops->sva_bind(dev, mm, drvdata); | |
2606 | ||
2607 | out_unlock: | |
2608 | mutex_unlock(&group->mutex); | |
2609 | iommu_group_put(group); | |
2610 | ||
2611 | return handle; | |
2612 | } | |
2613 | EXPORT_SYMBOL_GPL(iommu_sva_bind_device); | |
2614 | ||
2615 | /** | |
2616 | * iommu_sva_unbind_device() - Remove a bond created with iommu_sva_bind_device | |
2617 | * @handle: the handle returned by iommu_sva_bind_device() | |
2618 | * | |
2619 | * Put reference to a bond between device and address space. The device should | |
2620 | * not be issuing any more transaction for this PASID. All outstanding page | |
2621 | * requests for this PASID must have been flushed to the IOMMU. | |
2622 | * | |
2623 | * Returns 0 on success, or an error value | |
2624 | */ | |
2625 | void iommu_sva_unbind_device(struct iommu_sva *handle) | |
2626 | { | |
2627 | struct iommu_group *group; | |
2628 | struct device *dev = handle->dev; | |
2629 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
2630 | ||
2631 | if (!ops || !ops->sva_unbind) | |
2632 | return; | |
2633 | ||
2634 | group = iommu_group_get(dev); | |
2635 | if (!group) | |
2636 | return; | |
2637 | ||
2638 | mutex_lock(&group->mutex); | |
2639 | ops->sva_unbind(handle); | |
2640 | mutex_unlock(&group->mutex); | |
2641 | ||
2642 | iommu_group_put(group); | |
2643 | } | |
2644 | EXPORT_SYMBOL_GPL(iommu_sva_unbind_device); | |
2645 | ||
2646 | int iommu_sva_set_ops(struct iommu_sva *handle, | |
2647 | const struct iommu_sva_ops *sva_ops) | |
2648 | { | |
2649 | if (handle->ops && handle->ops != sva_ops) | |
2650 | return -EEXIST; | |
2651 | ||
2652 | handle->ops = sva_ops; | |
2653 | return 0; | |
2654 | } | |
2655 | EXPORT_SYMBOL_GPL(iommu_sva_set_ops); | |
2656 | ||
2657 | int iommu_sva_get_pasid(struct iommu_sva *handle) | |
2658 | { | |
2659 | const struct iommu_ops *ops = handle->dev->bus->iommu_ops; | |
2660 | ||
2661 | if (!ops || !ops->sva_get_pasid) | |
2662 | return IOMMU_PASID_INVALID; | |
2663 | ||
2664 | return ops->sva_get_pasid(handle); | |
2665 | } | |
2666 | EXPORT_SYMBOL_GPL(iommu_sva_get_pasid); |