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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> |
7f6db171 | 25 | #include <trace/events/iommu.h> |
d72e31c9 AW |
26 | |
27 | static struct kset *iommu_group_kset; | |
e38d1f13 | 28 | static DEFINE_IDA(iommu_group_ida); |
58d11317 OJ |
29 | #ifdef CONFIG_IOMMU_DEFAULT_PASSTHROUGH |
30 | static unsigned int iommu_def_domain_type = IOMMU_DOMAIN_IDENTITY; | |
31 | #else | |
fccb4e3b | 32 | static unsigned int iommu_def_domain_type = IOMMU_DOMAIN_DMA; |
58d11317 | 33 | #endif |
68a6efe8 | 34 | static bool iommu_dma_strict __read_mostly = true; |
d72e31c9 AW |
35 | |
36 | struct iommu_group { | |
37 | struct kobject kobj; | |
38 | struct kobject *devices_kobj; | |
39 | struct list_head devices; | |
40 | struct mutex mutex; | |
41 | struct blocking_notifier_head notifier; | |
42 | void *iommu_data; | |
43 | void (*iommu_data_release)(void *iommu_data); | |
44 | char *name; | |
45 | int id; | |
53723dc5 | 46 | struct iommu_domain *default_domain; |
e39cb8a3 | 47 | struct iommu_domain *domain; |
d72e31c9 AW |
48 | }; |
49 | ||
c09e22d5 | 50 | struct group_device { |
d72e31c9 AW |
51 | struct list_head list; |
52 | struct device *dev; | |
53 | char *name; | |
54 | }; | |
55 | ||
56 | struct iommu_group_attribute { | |
57 | struct attribute attr; | |
58 | ssize_t (*show)(struct iommu_group *group, char *buf); | |
59 | ssize_t (*store)(struct iommu_group *group, | |
60 | const char *buf, size_t count); | |
61 | }; | |
62 | ||
bc7d12b9 | 63 | static const char * const iommu_group_resv_type_string[] = { |
adfd3738 EA |
64 | [IOMMU_RESV_DIRECT] = "direct", |
65 | [IOMMU_RESV_DIRECT_RELAXABLE] = "direct-relaxable", | |
66 | [IOMMU_RESV_RESERVED] = "reserved", | |
67 | [IOMMU_RESV_MSI] = "msi", | |
68 | [IOMMU_RESV_SW_MSI] = "msi", | |
bc7d12b9 EA |
69 | }; |
70 | ||
d72e31c9 AW |
71 | #define IOMMU_GROUP_ATTR(_name, _mode, _show, _store) \ |
72 | struct iommu_group_attribute iommu_group_attr_##_name = \ | |
73 | __ATTR(_name, _mode, _show, _store) | |
fc2100eb | 74 | |
d72e31c9 AW |
75 | #define to_iommu_group_attr(_attr) \ |
76 | container_of(_attr, struct iommu_group_attribute, attr) | |
77 | #define to_iommu_group(_kobj) \ | |
78 | container_of(_kobj, struct iommu_group, kobj) | |
fc2100eb | 79 | |
b0119e87 JR |
80 | static LIST_HEAD(iommu_device_list); |
81 | static DEFINE_SPINLOCK(iommu_device_lock); | |
82 | ||
83 | int iommu_device_register(struct iommu_device *iommu) | |
84 | { | |
85 | spin_lock(&iommu_device_lock); | |
86 | list_add_tail(&iommu->list, &iommu_device_list); | |
87 | spin_unlock(&iommu_device_lock); | |
88 | ||
89 | return 0; | |
90 | } | |
91 | ||
92 | void iommu_device_unregister(struct iommu_device *iommu) | |
93 | { | |
94 | spin_lock(&iommu_device_lock); | |
95 | list_del(&iommu->list); | |
96 | spin_unlock(&iommu_device_lock); | |
97 | } | |
98 | ||
0c830e6b JP |
99 | static struct iommu_param *iommu_get_dev_param(struct device *dev) |
100 | { | |
101 | struct iommu_param *param = dev->iommu_param; | |
102 | ||
103 | if (param) | |
104 | return param; | |
105 | ||
106 | param = kzalloc(sizeof(*param), GFP_KERNEL); | |
107 | if (!param) | |
108 | return NULL; | |
109 | ||
110 | mutex_init(¶m->lock); | |
111 | dev->iommu_param = param; | |
112 | return param; | |
113 | } | |
114 | ||
115 | static void iommu_free_dev_param(struct device *dev) | |
116 | { | |
117 | kfree(dev->iommu_param); | |
118 | dev->iommu_param = NULL; | |
119 | } | |
120 | ||
cc5aed44 JR |
121 | int iommu_probe_device(struct device *dev) |
122 | { | |
123 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
0c830e6b | 124 | int ret; |
cc5aed44 JR |
125 | |
126 | WARN_ON(dev->iommu_group); | |
0c830e6b JP |
127 | if (!ops) |
128 | return -EINVAL; | |
cc5aed44 | 129 | |
0c830e6b JP |
130 | if (!iommu_get_dev_param(dev)) |
131 | return -ENOMEM; | |
cc5aed44 | 132 | |
0c830e6b JP |
133 | ret = ops->add_device(dev); |
134 | if (ret) | |
135 | iommu_free_dev_param(dev); | |
dc9de8a2 JR |
136 | |
137 | return ret; | |
cc5aed44 JR |
138 | } |
139 | ||
140 | void iommu_release_device(struct device *dev) | |
141 | { | |
142 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
143 | ||
144 | if (dev->iommu_group) | |
145 | ops->remove_device(dev); | |
0c830e6b JP |
146 | |
147 | iommu_free_dev_param(dev); | |
cc5aed44 JR |
148 | } |
149 | ||
53723dc5 JR |
150 | static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus, |
151 | unsigned type); | |
e39cb8a3 JR |
152 | static int __iommu_attach_device(struct iommu_domain *domain, |
153 | struct device *dev); | |
154 | static int __iommu_attach_group(struct iommu_domain *domain, | |
155 | struct iommu_group *group); | |
156 | static void __iommu_detach_group(struct iommu_domain *domain, | |
157 | struct iommu_group *group); | |
53723dc5 | 158 | |
fccb4e3b WD |
159 | static int __init iommu_set_def_domain_type(char *str) |
160 | { | |
161 | bool pt; | |
7f9584df | 162 | int ret; |
fccb4e3b | 163 | |
7f9584df AS |
164 | ret = kstrtobool(str, &pt); |
165 | if (ret) | |
166 | return ret; | |
fccb4e3b WD |
167 | |
168 | iommu_def_domain_type = pt ? IOMMU_DOMAIN_IDENTITY : IOMMU_DOMAIN_DMA; | |
169 | return 0; | |
170 | } | |
171 | early_param("iommu.passthrough", iommu_set_def_domain_type); | |
172 | ||
68a6efe8 ZL |
173 | static int __init iommu_dma_setup(char *str) |
174 | { | |
175 | return kstrtobool(str, &iommu_dma_strict); | |
176 | } | |
177 | early_param("iommu.strict", iommu_dma_setup); | |
178 | ||
d72e31c9 AW |
179 | static ssize_t iommu_group_attr_show(struct kobject *kobj, |
180 | struct attribute *__attr, char *buf) | |
1460432c | 181 | { |
d72e31c9 AW |
182 | struct iommu_group_attribute *attr = to_iommu_group_attr(__attr); |
183 | struct iommu_group *group = to_iommu_group(kobj); | |
184 | ssize_t ret = -EIO; | |
1460432c | 185 | |
d72e31c9 AW |
186 | if (attr->show) |
187 | ret = attr->show(group, buf); | |
188 | return ret; | |
189 | } | |
190 | ||
191 | static ssize_t iommu_group_attr_store(struct kobject *kobj, | |
192 | struct attribute *__attr, | |
193 | const char *buf, size_t count) | |
194 | { | |
195 | struct iommu_group_attribute *attr = to_iommu_group_attr(__attr); | |
196 | struct iommu_group *group = to_iommu_group(kobj); | |
197 | ssize_t ret = -EIO; | |
1460432c | 198 | |
d72e31c9 AW |
199 | if (attr->store) |
200 | ret = attr->store(group, buf, count); | |
201 | return ret; | |
1460432c | 202 | } |
1460432c | 203 | |
d72e31c9 AW |
204 | static const struct sysfs_ops iommu_group_sysfs_ops = { |
205 | .show = iommu_group_attr_show, | |
206 | .store = iommu_group_attr_store, | |
207 | }; | |
1460432c | 208 | |
d72e31c9 AW |
209 | static int iommu_group_create_file(struct iommu_group *group, |
210 | struct iommu_group_attribute *attr) | |
211 | { | |
212 | return sysfs_create_file(&group->kobj, &attr->attr); | |
1460432c | 213 | } |
1460432c | 214 | |
d72e31c9 AW |
215 | static void iommu_group_remove_file(struct iommu_group *group, |
216 | struct iommu_group_attribute *attr) | |
217 | { | |
218 | sysfs_remove_file(&group->kobj, &attr->attr); | |
219 | } | |
220 | ||
221 | static ssize_t iommu_group_show_name(struct iommu_group *group, char *buf) | |
222 | { | |
223 | return sprintf(buf, "%s\n", group->name); | |
224 | } | |
225 | ||
6c65fb31 EA |
226 | /** |
227 | * iommu_insert_resv_region - Insert a new region in the | |
228 | * list of reserved regions. | |
229 | * @new: new region to insert | |
230 | * @regions: list of regions | |
231 | * | |
232 | * The new element is sorted by address with respect to the other | |
233 | * regions of the same type. In case it overlaps with another | |
234 | * region of the same type, regions are merged. In case it | |
235 | * overlaps with another region of different type, regions are | |
236 | * not merged. | |
237 | */ | |
238 | static int iommu_insert_resv_region(struct iommu_resv_region *new, | |
239 | struct list_head *regions) | |
240 | { | |
241 | struct iommu_resv_region *region; | |
242 | phys_addr_t start = new->start; | |
243 | phys_addr_t end = new->start + new->length - 1; | |
244 | struct list_head *pos = regions->next; | |
245 | ||
246 | while (pos != regions) { | |
247 | struct iommu_resv_region *entry = | |
248 | list_entry(pos, struct iommu_resv_region, list); | |
249 | phys_addr_t a = entry->start; | |
250 | phys_addr_t b = entry->start + entry->length - 1; | |
251 | int type = entry->type; | |
252 | ||
253 | if (end < a) { | |
254 | goto insert; | |
255 | } else if (start > b) { | |
256 | pos = pos->next; | |
257 | } else if ((start >= a) && (end <= b)) { | |
258 | if (new->type == type) | |
ad0834de | 259 | return 0; |
6c65fb31 EA |
260 | else |
261 | pos = pos->next; | |
262 | } else { | |
263 | if (new->type == type) { | |
264 | phys_addr_t new_start = min(a, start); | |
265 | phys_addr_t new_end = max(b, end); | |
ad0834de | 266 | int ret; |
6c65fb31 EA |
267 | |
268 | list_del(&entry->list); | |
269 | entry->start = new_start; | |
270 | entry->length = new_end - new_start + 1; | |
ad0834de EA |
271 | ret = iommu_insert_resv_region(entry, regions); |
272 | kfree(entry); | |
273 | return ret; | |
6c65fb31 EA |
274 | } else { |
275 | pos = pos->next; | |
276 | } | |
277 | } | |
278 | } | |
279 | insert: | |
280 | region = iommu_alloc_resv_region(new->start, new->length, | |
281 | new->prot, new->type); | |
282 | if (!region) | |
283 | return -ENOMEM; | |
284 | ||
285 | list_add_tail(®ion->list, pos); | |
6c65fb31 EA |
286 | return 0; |
287 | } | |
288 | ||
289 | static int | |
290 | iommu_insert_device_resv_regions(struct list_head *dev_resv_regions, | |
291 | struct list_head *group_resv_regions) | |
292 | { | |
293 | struct iommu_resv_region *entry; | |
a514a6e2 | 294 | int ret = 0; |
6c65fb31 EA |
295 | |
296 | list_for_each_entry(entry, dev_resv_regions, list) { | |
297 | ret = iommu_insert_resv_region(entry, group_resv_regions); | |
298 | if (ret) | |
299 | break; | |
300 | } | |
301 | return ret; | |
302 | } | |
303 | ||
304 | int iommu_get_group_resv_regions(struct iommu_group *group, | |
305 | struct list_head *head) | |
306 | { | |
8d2932dd | 307 | struct group_device *device; |
6c65fb31 EA |
308 | int ret = 0; |
309 | ||
310 | mutex_lock(&group->mutex); | |
311 | list_for_each_entry(device, &group->devices, list) { | |
312 | struct list_head dev_resv_regions; | |
313 | ||
314 | INIT_LIST_HEAD(&dev_resv_regions); | |
315 | iommu_get_resv_regions(device->dev, &dev_resv_regions); | |
316 | ret = iommu_insert_device_resv_regions(&dev_resv_regions, head); | |
317 | iommu_put_resv_regions(device->dev, &dev_resv_regions); | |
318 | if (ret) | |
319 | break; | |
320 | } | |
321 | mutex_unlock(&group->mutex); | |
322 | return ret; | |
323 | } | |
324 | EXPORT_SYMBOL_GPL(iommu_get_group_resv_regions); | |
325 | ||
bc7d12b9 EA |
326 | static ssize_t iommu_group_show_resv_regions(struct iommu_group *group, |
327 | char *buf) | |
328 | { | |
329 | struct iommu_resv_region *region, *next; | |
330 | struct list_head group_resv_regions; | |
331 | char *str = buf; | |
332 | ||
333 | INIT_LIST_HEAD(&group_resv_regions); | |
334 | iommu_get_group_resv_regions(group, &group_resv_regions); | |
335 | ||
336 | list_for_each_entry_safe(region, next, &group_resv_regions, list) { | |
337 | str += sprintf(str, "0x%016llx 0x%016llx %s\n", | |
338 | (long long int)region->start, | |
339 | (long long int)(region->start + | |
340 | region->length - 1), | |
341 | iommu_group_resv_type_string[region->type]); | |
342 | kfree(region); | |
343 | } | |
344 | ||
345 | return (str - buf); | |
346 | } | |
347 | ||
c52c72d3 OJ |
348 | static ssize_t iommu_group_show_type(struct iommu_group *group, |
349 | char *buf) | |
350 | { | |
351 | char *type = "unknown\n"; | |
352 | ||
353 | if (group->default_domain) { | |
354 | switch (group->default_domain->type) { | |
355 | case IOMMU_DOMAIN_BLOCKED: | |
356 | type = "blocked\n"; | |
357 | break; | |
358 | case IOMMU_DOMAIN_IDENTITY: | |
359 | type = "identity\n"; | |
360 | break; | |
361 | case IOMMU_DOMAIN_UNMANAGED: | |
362 | type = "unmanaged\n"; | |
363 | break; | |
364 | case IOMMU_DOMAIN_DMA: | |
24f307d8 | 365 | type = "DMA\n"; |
c52c72d3 OJ |
366 | break; |
367 | } | |
368 | } | |
369 | strcpy(buf, type); | |
370 | ||
371 | return strlen(type); | |
372 | } | |
373 | ||
d72e31c9 AW |
374 | static IOMMU_GROUP_ATTR(name, S_IRUGO, iommu_group_show_name, NULL); |
375 | ||
bc7d12b9 EA |
376 | static IOMMU_GROUP_ATTR(reserved_regions, 0444, |
377 | iommu_group_show_resv_regions, NULL); | |
378 | ||
c52c72d3 OJ |
379 | static IOMMU_GROUP_ATTR(type, 0444, iommu_group_show_type, NULL); |
380 | ||
d72e31c9 AW |
381 | static void iommu_group_release(struct kobject *kobj) |
382 | { | |
383 | struct iommu_group *group = to_iommu_group(kobj); | |
384 | ||
269aa808 JR |
385 | pr_debug("Releasing group %d\n", group->id); |
386 | ||
d72e31c9 AW |
387 | if (group->iommu_data_release) |
388 | group->iommu_data_release(group->iommu_data); | |
389 | ||
feccf398 | 390 | ida_simple_remove(&iommu_group_ida, group->id); |
d72e31c9 | 391 | |
53723dc5 JR |
392 | if (group->default_domain) |
393 | iommu_domain_free(group->default_domain); | |
394 | ||
d72e31c9 AW |
395 | kfree(group->name); |
396 | kfree(group); | |
397 | } | |
398 | ||
399 | static struct kobj_type iommu_group_ktype = { | |
400 | .sysfs_ops = &iommu_group_sysfs_ops, | |
401 | .release = iommu_group_release, | |
402 | }; | |
403 | ||
404 | /** | |
405 | * iommu_group_alloc - Allocate a new group | |
d72e31c9 AW |
406 | * |
407 | * This function is called by an iommu driver to allocate a new iommu | |
408 | * group. The iommu group represents the minimum granularity of the iommu. | |
409 | * Upon successful return, the caller holds a reference to the supplied | |
410 | * group in order to hold the group until devices are added. Use | |
411 | * iommu_group_put() to release this extra reference count, allowing the | |
412 | * group to be automatically reclaimed once it has no devices or external | |
413 | * references. | |
414 | */ | |
415 | struct iommu_group *iommu_group_alloc(void) | |
1460432c | 416 | { |
d72e31c9 AW |
417 | struct iommu_group *group; |
418 | int ret; | |
419 | ||
420 | group = kzalloc(sizeof(*group), GFP_KERNEL); | |
421 | if (!group) | |
422 | return ERR_PTR(-ENOMEM); | |
423 | ||
424 | group->kobj.kset = iommu_group_kset; | |
425 | mutex_init(&group->mutex); | |
426 | INIT_LIST_HEAD(&group->devices); | |
427 | BLOCKING_INIT_NOTIFIER_HEAD(&group->notifier); | |
428 | ||
feccf398 HK |
429 | ret = ida_simple_get(&iommu_group_ida, 0, 0, GFP_KERNEL); |
430 | if (ret < 0) { | |
d72e31c9 | 431 | kfree(group); |
feccf398 | 432 | return ERR_PTR(ret); |
d72e31c9 | 433 | } |
feccf398 | 434 | group->id = ret; |
1460432c | 435 | |
d72e31c9 AW |
436 | ret = kobject_init_and_add(&group->kobj, &iommu_group_ktype, |
437 | NULL, "%d", group->id); | |
438 | if (ret) { | |
feccf398 | 439 | ida_simple_remove(&iommu_group_ida, group->id); |
d72e31c9 AW |
440 | kfree(group); |
441 | return ERR_PTR(ret); | |
442 | } | |
443 | ||
444 | group->devices_kobj = kobject_create_and_add("devices", &group->kobj); | |
445 | if (!group->devices_kobj) { | |
446 | kobject_put(&group->kobj); /* triggers .release & free */ | |
447 | return ERR_PTR(-ENOMEM); | |
448 | } | |
449 | ||
450 | /* | |
451 | * The devices_kobj holds a reference on the group kobject, so | |
452 | * as long as that exists so will the group. We can therefore | |
453 | * use the devices_kobj for reference counting. | |
454 | */ | |
455 | kobject_put(&group->kobj); | |
456 | ||
bc7d12b9 EA |
457 | ret = iommu_group_create_file(group, |
458 | &iommu_group_attr_reserved_regions); | |
459 | if (ret) | |
460 | return ERR_PTR(ret); | |
461 | ||
c52c72d3 OJ |
462 | ret = iommu_group_create_file(group, &iommu_group_attr_type); |
463 | if (ret) | |
464 | return ERR_PTR(ret); | |
465 | ||
269aa808 JR |
466 | pr_debug("Allocated group %d\n", group->id); |
467 | ||
d72e31c9 AW |
468 | return group; |
469 | } | |
470 | EXPORT_SYMBOL_GPL(iommu_group_alloc); | |
471 | ||
aa16bea9 AK |
472 | struct iommu_group *iommu_group_get_by_id(int id) |
473 | { | |
474 | struct kobject *group_kobj; | |
475 | struct iommu_group *group; | |
476 | const char *name; | |
477 | ||
478 | if (!iommu_group_kset) | |
479 | return NULL; | |
480 | ||
481 | name = kasprintf(GFP_KERNEL, "%d", id); | |
482 | if (!name) | |
483 | return NULL; | |
484 | ||
485 | group_kobj = kset_find_obj(iommu_group_kset, name); | |
486 | kfree(name); | |
487 | ||
488 | if (!group_kobj) | |
489 | return NULL; | |
490 | ||
491 | group = container_of(group_kobj, struct iommu_group, kobj); | |
492 | BUG_ON(group->id != id); | |
493 | ||
494 | kobject_get(group->devices_kobj); | |
495 | kobject_put(&group->kobj); | |
496 | ||
497 | return group; | |
498 | } | |
499 | EXPORT_SYMBOL_GPL(iommu_group_get_by_id); | |
500 | ||
d72e31c9 AW |
501 | /** |
502 | * iommu_group_get_iommudata - retrieve iommu_data registered for a group | |
503 | * @group: the group | |
504 | * | |
505 | * iommu drivers can store data in the group for use when doing iommu | |
506 | * operations. This function provides a way to retrieve it. Caller | |
507 | * should hold a group reference. | |
508 | */ | |
509 | void *iommu_group_get_iommudata(struct iommu_group *group) | |
510 | { | |
511 | return group->iommu_data; | |
512 | } | |
513 | EXPORT_SYMBOL_GPL(iommu_group_get_iommudata); | |
514 | ||
515 | /** | |
516 | * iommu_group_set_iommudata - set iommu_data for a group | |
517 | * @group: the group | |
518 | * @iommu_data: new data | |
519 | * @release: release function for iommu_data | |
520 | * | |
521 | * iommu drivers can store data in the group for use when doing iommu | |
522 | * operations. This function provides a way to set the data after | |
523 | * the group has been allocated. Caller should hold a group reference. | |
524 | */ | |
525 | void iommu_group_set_iommudata(struct iommu_group *group, void *iommu_data, | |
526 | void (*release)(void *iommu_data)) | |
1460432c | 527 | { |
d72e31c9 AW |
528 | group->iommu_data = iommu_data; |
529 | group->iommu_data_release = release; | |
530 | } | |
531 | EXPORT_SYMBOL_GPL(iommu_group_set_iommudata); | |
1460432c | 532 | |
d72e31c9 AW |
533 | /** |
534 | * iommu_group_set_name - set name for a group | |
535 | * @group: the group | |
536 | * @name: name | |
537 | * | |
538 | * Allow iommu driver to set a name for a group. When set it will | |
539 | * appear in a name attribute file under the group in sysfs. | |
540 | */ | |
541 | int iommu_group_set_name(struct iommu_group *group, const char *name) | |
542 | { | |
543 | int ret; | |
544 | ||
545 | if (group->name) { | |
546 | iommu_group_remove_file(group, &iommu_group_attr_name); | |
547 | kfree(group->name); | |
548 | group->name = NULL; | |
549 | if (!name) | |
550 | return 0; | |
551 | } | |
552 | ||
553 | group->name = kstrdup(name, GFP_KERNEL); | |
554 | if (!group->name) | |
555 | return -ENOMEM; | |
556 | ||
557 | ret = iommu_group_create_file(group, &iommu_group_attr_name); | |
558 | if (ret) { | |
559 | kfree(group->name); | |
560 | group->name = NULL; | |
561 | return ret; | |
562 | } | |
1460432c AW |
563 | |
564 | return 0; | |
565 | } | |
d72e31c9 | 566 | EXPORT_SYMBOL_GPL(iommu_group_set_name); |
1460432c | 567 | |
beed2821 JR |
568 | static int iommu_group_create_direct_mappings(struct iommu_group *group, |
569 | struct device *dev) | |
570 | { | |
571 | struct iommu_domain *domain = group->default_domain; | |
e5b5234a | 572 | struct iommu_resv_region *entry; |
beed2821 JR |
573 | struct list_head mappings; |
574 | unsigned long pg_size; | |
575 | int ret = 0; | |
576 | ||
577 | if (!domain || domain->type != IOMMU_DOMAIN_DMA) | |
578 | return 0; | |
579 | ||
d16e0faa | 580 | BUG_ON(!domain->pgsize_bitmap); |
beed2821 | 581 | |
d16e0faa | 582 | pg_size = 1UL << __ffs(domain->pgsize_bitmap); |
beed2821 JR |
583 | INIT_LIST_HEAD(&mappings); |
584 | ||
e5b5234a | 585 | iommu_get_resv_regions(dev, &mappings); |
beed2821 JR |
586 | |
587 | /* We need to consider overlapping regions for different devices */ | |
588 | list_for_each_entry(entry, &mappings, list) { | |
589 | dma_addr_t start, end, addr; | |
590 | ||
e5b5234a EA |
591 | if (domain->ops->apply_resv_region) |
592 | domain->ops->apply_resv_region(dev, domain, entry); | |
33b21a6b | 593 | |
beed2821 JR |
594 | start = ALIGN(entry->start, pg_size); |
595 | end = ALIGN(entry->start + entry->length, pg_size); | |
596 | ||
adfd3738 EA |
597 | if (entry->type != IOMMU_RESV_DIRECT && |
598 | entry->type != IOMMU_RESV_DIRECT_RELAXABLE) | |
544a25d9 EA |
599 | continue; |
600 | ||
beed2821 JR |
601 | for (addr = start; addr < end; addr += pg_size) { |
602 | phys_addr_t phys_addr; | |
603 | ||
604 | phys_addr = iommu_iova_to_phys(domain, addr); | |
605 | if (phys_addr) | |
606 | continue; | |
607 | ||
608 | ret = iommu_map(domain, addr, addr, pg_size, entry->prot); | |
609 | if (ret) | |
610 | goto out; | |
611 | } | |
612 | ||
613 | } | |
614 | ||
add02cfd JR |
615 | iommu_flush_tlb_all(domain); |
616 | ||
beed2821 | 617 | out: |
e5b5234a | 618 | iommu_put_resv_regions(dev, &mappings); |
beed2821 JR |
619 | |
620 | return ret; | |
621 | } | |
622 | ||
d72e31c9 AW |
623 | /** |
624 | * iommu_group_add_device - add a device to an iommu group | |
625 | * @group: the group into which to add the device (reference should be held) | |
626 | * @dev: the device | |
627 | * | |
628 | * This function is called by an iommu driver to add a device into a | |
629 | * group. Adding a device increments the group reference count. | |
630 | */ | |
631 | int iommu_group_add_device(struct iommu_group *group, struct device *dev) | |
1460432c | 632 | { |
d72e31c9 | 633 | int ret, i = 0; |
c09e22d5 | 634 | struct group_device *device; |
d72e31c9 AW |
635 | |
636 | device = kzalloc(sizeof(*device), GFP_KERNEL); | |
637 | if (!device) | |
638 | return -ENOMEM; | |
639 | ||
640 | device->dev = dev; | |
1460432c | 641 | |
d72e31c9 | 642 | ret = sysfs_create_link(&dev->kobj, &group->kobj, "iommu_group"); |
797a8b4d RM |
643 | if (ret) |
644 | goto err_free_device; | |
d72e31c9 AW |
645 | |
646 | device->name = kasprintf(GFP_KERNEL, "%s", kobject_name(&dev->kobj)); | |
647 | rename: | |
648 | if (!device->name) { | |
797a8b4d RM |
649 | ret = -ENOMEM; |
650 | goto err_remove_link; | |
d72e31c9 | 651 | } |
1460432c | 652 | |
d72e31c9 AW |
653 | ret = sysfs_create_link_nowarn(group->devices_kobj, |
654 | &dev->kobj, device->name); | |
655 | if (ret) { | |
d72e31c9 AW |
656 | if (ret == -EEXIST && i >= 0) { |
657 | /* | |
658 | * Account for the slim chance of collision | |
659 | * and append an instance to the name. | |
660 | */ | |
797a8b4d | 661 | kfree(device->name); |
d72e31c9 AW |
662 | device->name = kasprintf(GFP_KERNEL, "%s.%d", |
663 | kobject_name(&dev->kobj), i++); | |
664 | goto rename; | |
665 | } | |
797a8b4d | 666 | goto err_free_name; |
d72e31c9 AW |
667 | } |
668 | ||
669 | kobject_get(group->devices_kobj); | |
670 | ||
671 | dev->iommu_group = group; | |
672 | ||
beed2821 JR |
673 | iommu_group_create_direct_mappings(group, dev); |
674 | ||
d72e31c9 AW |
675 | mutex_lock(&group->mutex); |
676 | list_add_tail(&device->list, &group->devices); | |
e39cb8a3 | 677 | if (group->domain) |
797a8b4d | 678 | ret = __iommu_attach_device(group->domain, dev); |
d72e31c9 | 679 | mutex_unlock(&group->mutex); |
797a8b4d RM |
680 | if (ret) |
681 | goto err_put_group; | |
d72e31c9 AW |
682 | |
683 | /* Notify any listeners about change to group. */ | |
684 | blocking_notifier_call_chain(&group->notifier, | |
685 | IOMMU_GROUP_NOTIFY_ADD_DEVICE, dev); | |
d1cf7e82 SK |
686 | |
687 | trace_add_device_to_group(group->id, dev); | |
269aa808 | 688 | |
780da9e4 | 689 | dev_info(dev, "Adding to iommu group %d\n", group->id); |
269aa808 | 690 | |
1460432c | 691 | return 0; |
797a8b4d RM |
692 | |
693 | err_put_group: | |
694 | mutex_lock(&group->mutex); | |
695 | list_del(&device->list); | |
696 | mutex_unlock(&group->mutex); | |
697 | dev->iommu_group = NULL; | |
698 | kobject_put(group->devices_kobj); | |
699 | err_free_name: | |
700 | kfree(device->name); | |
701 | err_remove_link: | |
702 | sysfs_remove_link(&dev->kobj, "iommu_group"); | |
703 | err_free_device: | |
704 | kfree(device); | |
780da9e4 | 705 | dev_err(dev, "Failed to add to iommu group %d: %d\n", group->id, ret); |
797a8b4d | 706 | return ret; |
1460432c | 707 | } |
d72e31c9 | 708 | EXPORT_SYMBOL_GPL(iommu_group_add_device); |
1460432c | 709 | |
d72e31c9 AW |
710 | /** |
711 | * iommu_group_remove_device - remove a device from it's current group | |
712 | * @dev: device to be removed | |
713 | * | |
714 | * This function is called by an iommu driver to remove the device from | |
715 | * it's current group. This decrements the iommu group reference count. | |
716 | */ | |
717 | void iommu_group_remove_device(struct device *dev) | |
718 | { | |
719 | struct iommu_group *group = dev->iommu_group; | |
c09e22d5 | 720 | struct group_device *tmp_device, *device = NULL; |
d72e31c9 | 721 | |
780da9e4 | 722 | dev_info(dev, "Removing from iommu group %d\n", group->id); |
269aa808 | 723 | |
d72e31c9 AW |
724 | /* Pre-notify listeners that a device is being removed. */ |
725 | blocking_notifier_call_chain(&group->notifier, | |
726 | IOMMU_GROUP_NOTIFY_DEL_DEVICE, dev); | |
727 | ||
728 | mutex_lock(&group->mutex); | |
729 | list_for_each_entry(tmp_device, &group->devices, list) { | |
730 | if (tmp_device->dev == dev) { | |
731 | device = tmp_device; | |
732 | list_del(&device->list); | |
733 | break; | |
734 | } | |
735 | } | |
736 | mutex_unlock(&group->mutex); | |
737 | ||
738 | if (!device) | |
739 | return; | |
740 | ||
741 | sysfs_remove_link(group->devices_kobj, device->name); | |
742 | sysfs_remove_link(&dev->kobj, "iommu_group"); | |
743 | ||
2e757086 SK |
744 | trace_remove_device_from_group(group->id, dev); |
745 | ||
d72e31c9 AW |
746 | kfree(device->name); |
747 | kfree(device); | |
748 | dev->iommu_group = NULL; | |
749 | kobject_put(group->devices_kobj); | |
750 | } | |
751 | EXPORT_SYMBOL_GPL(iommu_group_remove_device); | |
752 | ||
426a2738 JR |
753 | static int iommu_group_device_count(struct iommu_group *group) |
754 | { | |
c09e22d5 | 755 | struct group_device *entry; |
426a2738 JR |
756 | int ret = 0; |
757 | ||
758 | list_for_each_entry(entry, &group->devices, list) | |
759 | ret++; | |
760 | ||
761 | return ret; | |
762 | } | |
763 | ||
d72e31c9 AW |
764 | /** |
765 | * iommu_group_for_each_dev - iterate over each device in the group | |
766 | * @group: the group | |
767 | * @data: caller opaque data to be passed to callback function | |
768 | * @fn: caller supplied callback function | |
769 | * | |
770 | * This function is called by group users to iterate over group devices. | |
771 | * Callers should hold a reference count to the group during callback. | |
772 | * The group->mutex is held across callbacks, which will block calls to | |
773 | * iommu_group_add/remove_device. | |
774 | */ | |
e39cb8a3 JR |
775 | static int __iommu_group_for_each_dev(struct iommu_group *group, void *data, |
776 | int (*fn)(struct device *, void *)) | |
d72e31c9 | 777 | { |
c09e22d5 | 778 | struct group_device *device; |
d72e31c9 AW |
779 | int ret = 0; |
780 | ||
d72e31c9 AW |
781 | list_for_each_entry(device, &group->devices, list) { |
782 | ret = fn(device->dev, data); | |
783 | if (ret) | |
784 | break; | |
785 | } | |
e39cb8a3 JR |
786 | return ret; |
787 | } | |
788 | ||
789 | ||
790 | int iommu_group_for_each_dev(struct iommu_group *group, void *data, | |
791 | int (*fn)(struct device *, void *)) | |
792 | { | |
793 | int ret; | |
794 | ||
795 | mutex_lock(&group->mutex); | |
796 | ret = __iommu_group_for_each_dev(group, data, fn); | |
d72e31c9 | 797 | mutex_unlock(&group->mutex); |
e39cb8a3 | 798 | |
d72e31c9 AW |
799 | return ret; |
800 | } | |
801 | EXPORT_SYMBOL_GPL(iommu_group_for_each_dev); | |
802 | ||
803 | /** | |
804 | * iommu_group_get - Return the group for a device and increment reference | |
805 | * @dev: get the group that this device belongs to | |
806 | * | |
807 | * This function is called by iommu drivers and users to get the group | |
808 | * for the specified device. If found, the group is returned and the group | |
809 | * reference in incremented, else NULL. | |
810 | */ | |
811 | struct iommu_group *iommu_group_get(struct device *dev) | |
812 | { | |
813 | struct iommu_group *group = dev->iommu_group; | |
814 | ||
815 | if (group) | |
816 | kobject_get(group->devices_kobj); | |
817 | ||
818 | return group; | |
819 | } | |
820 | EXPORT_SYMBOL_GPL(iommu_group_get); | |
821 | ||
13f59a78 RM |
822 | /** |
823 | * iommu_group_ref_get - Increment reference on a group | |
824 | * @group: the group to use, must not be NULL | |
825 | * | |
826 | * This function is called by iommu drivers to take additional references on an | |
827 | * existing group. Returns the given group for convenience. | |
828 | */ | |
829 | struct iommu_group *iommu_group_ref_get(struct iommu_group *group) | |
830 | { | |
831 | kobject_get(group->devices_kobj); | |
832 | return group; | |
833 | } | |
834 | ||
d72e31c9 AW |
835 | /** |
836 | * iommu_group_put - Decrement group reference | |
837 | * @group: the group to use | |
838 | * | |
839 | * This function is called by iommu drivers and users to release the | |
840 | * iommu group. Once the reference count is zero, the group is released. | |
841 | */ | |
842 | void iommu_group_put(struct iommu_group *group) | |
843 | { | |
844 | if (group) | |
845 | kobject_put(group->devices_kobj); | |
846 | } | |
847 | EXPORT_SYMBOL_GPL(iommu_group_put); | |
848 | ||
849 | /** | |
850 | * iommu_group_register_notifier - Register a notifier for group changes | |
851 | * @group: the group to watch | |
852 | * @nb: notifier block to signal | |
853 | * | |
854 | * This function allows iommu group users to track changes in a group. | |
855 | * See include/linux/iommu.h for actions sent via this notifier. Caller | |
856 | * should hold a reference to the group throughout notifier registration. | |
857 | */ | |
858 | int iommu_group_register_notifier(struct iommu_group *group, | |
859 | struct notifier_block *nb) | |
860 | { | |
861 | return blocking_notifier_chain_register(&group->notifier, nb); | |
862 | } | |
863 | EXPORT_SYMBOL_GPL(iommu_group_register_notifier); | |
864 | ||
865 | /** | |
866 | * iommu_group_unregister_notifier - Unregister a notifier | |
867 | * @group: the group to watch | |
868 | * @nb: notifier block to signal | |
869 | * | |
870 | * Unregister a previously registered group notifier block. | |
871 | */ | |
872 | int iommu_group_unregister_notifier(struct iommu_group *group, | |
873 | struct notifier_block *nb) | |
874 | { | |
875 | return blocking_notifier_chain_unregister(&group->notifier, nb); | |
876 | } | |
877 | EXPORT_SYMBOL_GPL(iommu_group_unregister_notifier); | |
878 | ||
0c830e6b JP |
879 | /** |
880 | * iommu_register_device_fault_handler() - Register a device fault handler | |
881 | * @dev: the device | |
882 | * @handler: the fault handler | |
883 | * @data: private data passed as argument to the handler | |
884 | * | |
885 | * When an IOMMU fault event is received, this handler gets called with the | |
bf3255b3 JPB |
886 | * fault event and data as argument. The handler should return 0 on success. If |
887 | * the fault is recoverable (IOMMU_FAULT_PAGE_REQ), the consumer should also | |
888 | * complete the fault by calling iommu_page_response() with one of the following | |
889 | * response code: | |
890 | * - IOMMU_PAGE_RESP_SUCCESS: retry the translation | |
891 | * - IOMMU_PAGE_RESP_INVALID: terminate the fault | |
892 | * - IOMMU_PAGE_RESP_FAILURE: terminate the fault and stop reporting | |
893 | * page faults if possible. | |
0c830e6b JP |
894 | * |
895 | * Return 0 if the fault handler was installed successfully, or an error. | |
896 | */ | |
897 | int iommu_register_device_fault_handler(struct device *dev, | |
898 | iommu_dev_fault_handler_t handler, | |
899 | void *data) | |
900 | { | |
901 | struct iommu_param *param = dev->iommu_param; | |
902 | int ret = 0; | |
903 | ||
904 | if (!param) | |
905 | return -EINVAL; | |
906 | ||
907 | mutex_lock(¶m->lock); | |
908 | /* Only allow one fault handler registered for each device */ | |
909 | if (param->fault_param) { | |
910 | ret = -EBUSY; | |
911 | goto done_unlock; | |
912 | } | |
913 | ||
914 | get_device(dev); | |
915 | param->fault_param = kzalloc(sizeof(*param->fault_param), GFP_KERNEL); | |
916 | if (!param->fault_param) { | |
917 | put_device(dev); | |
918 | ret = -ENOMEM; | |
919 | goto done_unlock; | |
920 | } | |
921 | param->fault_param->handler = handler; | |
922 | param->fault_param->data = data; | |
bf3255b3 JPB |
923 | mutex_init(¶m->fault_param->lock); |
924 | INIT_LIST_HEAD(¶m->fault_param->faults); | |
0c830e6b JP |
925 | |
926 | done_unlock: | |
927 | mutex_unlock(¶m->lock); | |
928 | ||
929 | return ret; | |
930 | } | |
931 | EXPORT_SYMBOL_GPL(iommu_register_device_fault_handler); | |
932 | ||
933 | /** | |
934 | * iommu_unregister_device_fault_handler() - Unregister the device fault handler | |
935 | * @dev: the device | |
936 | * | |
937 | * Remove the device fault handler installed with | |
938 | * iommu_register_device_fault_handler(). | |
939 | * | |
940 | * Return 0 on success, or an error. | |
941 | */ | |
942 | int iommu_unregister_device_fault_handler(struct device *dev) | |
943 | { | |
944 | struct iommu_param *param = dev->iommu_param; | |
945 | int ret = 0; | |
946 | ||
947 | if (!param) | |
948 | return -EINVAL; | |
949 | ||
950 | mutex_lock(¶m->lock); | |
951 | ||
952 | if (!param->fault_param) | |
953 | goto unlock; | |
954 | ||
bf3255b3 JPB |
955 | /* we cannot unregister handler if there are pending faults */ |
956 | if (!list_empty(¶m->fault_param->faults)) { | |
957 | ret = -EBUSY; | |
958 | goto unlock; | |
959 | } | |
960 | ||
0c830e6b JP |
961 | kfree(param->fault_param); |
962 | param->fault_param = NULL; | |
963 | put_device(dev); | |
964 | unlock: | |
965 | mutex_unlock(¶m->lock); | |
966 | ||
967 | return ret; | |
968 | } | |
969 | EXPORT_SYMBOL_GPL(iommu_unregister_device_fault_handler); | |
970 | ||
971 | /** | |
972 | * iommu_report_device_fault() - Report fault event to device driver | |
973 | * @dev: the device | |
974 | * @evt: fault event data | |
975 | * | |
976 | * Called by IOMMU drivers when a fault is detected, typically in a threaded IRQ | |
bf3255b3 JPB |
977 | * handler. When this function fails and the fault is recoverable, it is the |
978 | * caller's responsibility to complete the fault. | |
0c830e6b JP |
979 | * |
980 | * Return 0 on success, or an error. | |
981 | */ | |
982 | int iommu_report_device_fault(struct device *dev, struct iommu_fault_event *evt) | |
983 | { | |
984 | struct iommu_param *param = dev->iommu_param; | |
bf3255b3 | 985 | struct iommu_fault_event *evt_pending = NULL; |
0c830e6b JP |
986 | struct iommu_fault_param *fparam; |
987 | int ret = 0; | |
988 | ||
989 | if (!param || !evt) | |
990 | return -EINVAL; | |
991 | ||
992 | /* we only report device fault if there is a handler registered */ | |
993 | mutex_lock(¶m->lock); | |
994 | fparam = param->fault_param; | |
995 | if (!fparam || !fparam->handler) { | |
996 | ret = -EINVAL; | |
997 | goto done_unlock; | |
998 | } | |
bf3255b3 JPB |
999 | |
1000 | if (evt->fault.type == IOMMU_FAULT_PAGE_REQ && | |
1001 | (evt->fault.prm.flags & IOMMU_FAULT_PAGE_REQUEST_LAST_PAGE)) { | |
1002 | evt_pending = kmemdup(evt, sizeof(struct iommu_fault_event), | |
1003 | GFP_KERNEL); | |
1004 | if (!evt_pending) { | |
1005 | ret = -ENOMEM; | |
1006 | goto done_unlock; | |
1007 | } | |
1008 | mutex_lock(&fparam->lock); | |
1009 | list_add_tail(&evt_pending->list, &fparam->faults); | |
1010 | mutex_unlock(&fparam->lock); | |
1011 | } | |
1012 | ||
0c830e6b | 1013 | ret = fparam->handler(&evt->fault, fparam->data); |
bf3255b3 JPB |
1014 | if (ret && evt_pending) { |
1015 | mutex_lock(&fparam->lock); | |
1016 | list_del(&evt_pending->list); | |
1017 | mutex_unlock(&fparam->lock); | |
1018 | kfree(evt_pending); | |
1019 | } | |
0c830e6b JP |
1020 | done_unlock: |
1021 | mutex_unlock(¶m->lock); | |
1022 | return ret; | |
1023 | } | |
1024 | EXPORT_SYMBOL_GPL(iommu_report_device_fault); | |
1025 | ||
bf3255b3 JPB |
1026 | int iommu_page_response(struct device *dev, |
1027 | struct iommu_page_response *msg) | |
1028 | { | |
1029 | bool pasid_valid; | |
1030 | int ret = -EINVAL; | |
1031 | struct iommu_fault_event *evt; | |
1032 | struct iommu_fault_page_request *prm; | |
1033 | struct iommu_param *param = dev->iommu_param; | |
1034 | struct iommu_domain *domain = iommu_get_domain_for_dev(dev); | |
1035 | ||
1036 | if (!domain || !domain->ops->page_response) | |
1037 | return -ENODEV; | |
1038 | ||
1039 | if (!param || !param->fault_param) | |
1040 | return -EINVAL; | |
1041 | ||
1042 | if (msg->version != IOMMU_PAGE_RESP_VERSION_1 || | |
1043 | msg->flags & ~IOMMU_PAGE_RESP_PASID_VALID) | |
1044 | return -EINVAL; | |
1045 | ||
1046 | /* Only send response if there is a fault report pending */ | |
1047 | mutex_lock(¶m->fault_param->lock); | |
1048 | if (list_empty(¶m->fault_param->faults)) { | |
1049 | dev_warn_ratelimited(dev, "no pending PRQ, drop response\n"); | |
1050 | goto done_unlock; | |
1051 | } | |
1052 | /* | |
1053 | * Check if we have a matching page request pending to respond, | |
1054 | * otherwise return -EINVAL | |
1055 | */ | |
1056 | list_for_each_entry(evt, ¶m->fault_param->faults, list) { | |
1057 | prm = &evt->fault.prm; | |
1058 | pasid_valid = prm->flags & IOMMU_FAULT_PAGE_REQUEST_PASID_VALID; | |
1059 | ||
1060 | if ((pasid_valid && prm->pasid != msg->pasid) || | |
1061 | prm->grpid != msg->grpid) | |
1062 | continue; | |
1063 | ||
1064 | /* Sanitize the reply */ | |
1065 | msg->flags = pasid_valid ? IOMMU_PAGE_RESP_PASID_VALID : 0; | |
1066 | ||
1067 | ret = domain->ops->page_response(dev, evt, msg); | |
1068 | list_del(&evt->list); | |
1069 | kfree(evt); | |
1070 | break; | |
1071 | } | |
1072 | ||
1073 | done_unlock: | |
1074 | mutex_unlock(¶m->fault_param->lock); | |
1075 | return ret; | |
1076 | } | |
1077 | EXPORT_SYMBOL_GPL(iommu_page_response); | |
1078 | ||
d72e31c9 AW |
1079 | /** |
1080 | * iommu_group_id - Return ID for a group | |
1081 | * @group: the group to ID | |
1082 | * | |
1083 | * Return the unique ID for the group matching the sysfs group number. | |
1084 | */ | |
1085 | int iommu_group_id(struct iommu_group *group) | |
1086 | { | |
1087 | return group->id; | |
1088 | } | |
1089 | EXPORT_SYMBOL_GPL(iommu_group_id); | |
1460432c | 1090 | |
f096c061 AW |
1091 | static struct iommu_group *get_pci_alias_group(struct pci_dev *pdev, |
1092 | unsigned long *devfns); | |
1093 | ||
104a1c13 AW |
1094 | /* |
1095 | * To consider a PCI device isolated, we require ACS to support Source | |
1096 | * Validation, Request Redirection, Completer Redirection, and Upstream | |
1097 | * Forwarding. This effectively means that devices cannot spoof their | |
1098 | * requester ID, requests and completions cannot be redirected, and all | |
1099 | * transactions are forwarded upstream, even as it passes through a | |
1100 | * bridge where the target device is downstream. | |
1101 | */ | |
1102 | #define REQ_ACS_FLAGS (PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF) | |
1103 | ||
f096c061 AW |
1104 | /* |
1105 | * For multifunction devices which are not isolated from each other, find | |
1106 | * all the other non-isolated functions and look for existing groups. For | |
1107 | * each function, we also need to look for aliases to or from other devices | |
1108 | * that may already have a group. | |
1109 | */ | |
1110 | static struct iommu_group *get_pci_function_alias_group(struct pci_dev *pdev, | |
1111 | unsigned long *devfns) | |
1112 | { | |
1113 | struct pci_dev *tmp = NULL; | |
1114 | struct iommu_group *group; | |
1115 | ||
1116 | if (!pdev->multifunction || pci_acs_enabled(pdev, REQ_ACS_FLAGS)) | |
1117 | return NULL; | |
1118 | ||
1119 | for_each_pci_dev(tmp) { | |
1120 | if (tmp == pdev || tmp->bus != pdev->bus || | |
1121 | PCI_SLOT(tmp->devfn) != PCI_SLOT(pdev->devfn) || | |
1122 | pci_acs_enabled(tmp, REQ_ACS_FLAGS)) | |
1123 | continue; | |
1124 | ||
1125 | group = get_pci_alias_group(tmp, devfns); | |
1126 | if (group) { | |
1127 | pci_dev_put(tmp); | |
1128 | return group; | |
1129 | } | |
1130 | } | |
1131 | ||
1132 | return NULL; | |
1133 | } | |
1134 | ||
1135 | /* | |
338c3149 JL |
1136 | * Look for aliases to or from the given device for existing groups. DMA |
1137 | * aliases are only supported on the same bus, therefore the search | |
f096c061 AW |
1138 | * space is quite small (especially since we're really only looking at pcie |
1139 | * device, and therefore only expect multiple slots on the root complex or | |
1140 | * downstream switch ports). It's conceivable though that a pair of | |
1141 | * multifunction devices could have aliases between them that would cause a | |
1142 | * loop. To prevent this, we use a bitmap to track where we've been. | |
1143 | */ | |
1144 | static struct iommu_group *get_pci_alias_group(struct pci_dev *pdev, | |
1145 | unsigned long *devfns) | |
1146 | { | |
1147 | struct pci_dev *tmp = NULL; | |
1148 | struct iommu_group *group; | |
1149 | ||
1150 | if (test_and_set_bit(pdev->devfn & 0xff, devfns)) | |
1151 | return NULL; | |
1152 | ||
1153 | group = iommu_group_get(&pdev->dev); | |
1154 | if (group) | |
1155 | return group; | |
1156 | ||
1157 | for_each_pci_dev(tmp) { | |
1158 | if (tmp == pdev || tmp->bus != pdev->bus) | |
1159 | continue; | |
1160 | ||
1161 | /* We alias them or they alias us */ | |
338c3149 | 1162 | if (pci_devs_are_dma_aliases(pdev, tmp)) { |
f096c061 AW |
1163 | group = get_pci_alias_group(tmp, devfns); |
1164 | if (group) { | |
1165 | pci_dev_put(tmp); | |
1166 | return group; | |
1167 | } | |
1168 | ||
1169 | group = get_pci_function_alias_group(tmp, devfns); | |
1170 | if (group) { | |
1171 | pci_dev_put(tmp); | |
1172 | return group; | |
1173 | } | |
1174 | } | |
1175 | } | |
1176 | ||
1177 | return NULL; | |
1178 | } | |
1179 | ||
104a1c13 AW |
1180 | struct group_for_pci_data { |
1181 | struct pci_dev *pdev; | |
1182 | struct iommu_group *group; | |
1183 | }; | |
1184 | ||
1185 | /* | |
1186 | * DMA alias iterator callback, return the last seen device. Stop and return | |
1187 | * the IOMMU group if we find one along the way. | |
1188 | */ | |
1189 | static int get_pci_alias_or_group(struct pci_dev *pdev, u16 alias, void *opaque) | |
1190 | { | |
1191 | struct group_for_pci_data *data = opaque; | |
1192 | ||
1193 | data->pdev = pdev; | |
1194 | data->group = iommu_group_get(&pdev->dev); | |
1195 | ||
1196 | return data->group != NULL; | |
1197 | } | |
1198 | ||
6eab556a JR |
1199 | /* |
1200 | * Generic device_group call-back function. It just allocates one | |
1201 | * iommu-group per device. | |
1202 | */ | |
1203 | struct iommu_group *generic_device_group(struct device *dev) | |
1204 | { | |
7f7a2304 | 1205 | return iommu_group_alloc(); |
6eab556a JR |
1206 | } |
1207 | ||
104a1c13 AW |
1208 | /* |
1209 | * Use standard PCI bus topology, isolation features, and DMA alias quirks | |
1210 | * to find or create an IOMMU group for a device. | |
1211 | */ | |
5e62292b | 1212 | struct iommu_group *pci_device_group(struct device *dev) |
104a1c13 | 1213 | { |
5e62292b | 1214 | struct pci_dev *pdev = to_pci_dev(dev); |
104a1c13 AW |
1215 | struct group_for_pci_data data; |
1216 | struct pci_bus *bus; | |
1217 | struct iommu_group *group = NULL; | |
f096c061 | 1218 | u64 devfns[4] = { 0 }; |
104a1c13 | 1219 | |
5e62292b JR |
1220 | if (WARN_ON(!dev_is_pci(dev))) |
1221 | return ERR_PTR(-EINVAL); | |
1222 | ||
104a1c13 AW |
1223 | /* |
1224 | * Find the upstream DMA alias for the device. A device must not | |
1225 | * be aliased due to topology in order to have its own IOMMU group. | |
1226 | * If we find an alias along the way that already belongs to a | |
1227 | * group, use it. | |
1228 | */ | |
1229 | if (pci_for_each_dma_alias(pdev, get_pci_alias_or_group, &data)) | |
1230 | return data.group; | |
1231 | ||
1232 | pdev = data.pdev; | |
1233 | ||
1234 | /* | |
1235 | * Continue upstream from the point of minimum IOMMU granularity | |
1236 | * due to aliases to the point where devices are protected from | |
1237 | * peer-to-peer DMA by PCI ACS. Again, if we find an existing | |
1238 | * group, use it. | |
1239 | */ | |
1240 | for (bus = pdev->bus; !pci_is_root_bus(bus); bus = bus->parent) { | |
1241 | if (!bus->self) | |
1242 | continue; | |
1243 | ||
1244 | if (pci_acs_path_enabled(bus->self, NULL, REQ_ACS_FLAGS)) | |
1245 | break; | |
1246 | ||
1247 | pdev = bus->self; | |
1248 | ||
1249 | group = iommu_group_get(&pdev->dev); | |
1250 | if (group) | |
1251 | return group; | |
1252 | } | |
1253 | ||
1254 | /* | |
f096c061 AW |
1255 | * Look for existing groups on device aliases. If we alias another |
1256 | * device or another device aliases us, use the same group. | |
104a1c13 | 1257 | */ |
f096c061 AW |
1258 | group = get_pci_alias_group(pdev, (unsigned long *)devfns); |
1259 | if (group) | |
1260 | return group; | |
104a1c13 AW |
1261 | |
1262 | /* | |
f096c061 AW |
1263 | * Look for existing groups on non-isolated functions on the same |
1264 | * slot and aliases of those funcions, if any. No need to clear | |
1265 | * the search bitmap, the tested devfns are still valid. | |
104a1c13 | 1266 | */ |
f096c061 AW |
1267 | group = get_pci_function_alias_group(pdev, (unsigned long *)devfns); |
1268 | if (group) | |
1269 | return group; | |
104a1c13 AW |
1270 | |
1271 | /* No shared group found, allocate new */ | |
7f7a2304 | 1272 | return iommu_group_alloc(); |
104a1c13 AW |
1273 | } |
1274 | ||
eab03e2a NG |
1275 | /* Get the IOMMU group for device on fsl-mc bus */ |
1276 | struct iommu_group *fsl_mc_device_group(struct device *dev) | |
1277 | { | |
1278 | struct device *cont_dev = fsl_mc_cont_dev(dev); | |
1279 | struct iommu_group *group; | |
1280 | ||
1281 | group = iommu_group_get(cont_dev); | |
1282 | if (!group) | |
1283 | group = iommu_group_alloc(); | |
1284 | return group; | |
1285 | } | |
1286 | ||
104a1c13 AW |
1287 | /** |
1288 | * iommu_group_get_for_dev - Find or create the IOMMU group for a device | |
1289 | * @dev: target device | |
1290 | * | |
1291 | * This function is intended to be called by IOMMU drivers and extended to | |
1292 | * support common, bus-defined algorithms when determining or creating the | |
1293 | * IOMMU group for a device. On success, the caller will hold a reference | |
1294 | * to the returned IOMMU group, which will already include the provided | |
1295 | * device. The reference should be released with iommu_group_put(). | |
1296 | */ | |
1297 | struct iommu_group *iommu_group_get_for_dev(struct device *dev) | |
1298 | { | |
46c6b2bc | 1299 | const struct iommu_ops *ops = dev->bus->iommu_ops; |
c4a783b8 | 1300 | struct iommu_group *group; |
104a1c13 AW |
1301 | int ret; |
1302 | ||
1303 | group = iommu_group_get(dev); | |
1304 | if (group) | |
1305 | return group; | |
1306 | ||
05f80300 RM |
1307 | if (!ops) |
1308 | return ERR_PTR(-EINVAL); | |
104a1c13 | 1309 | |
05f80300 | 1310 | group = ops->device_group(dev); |
72dcac63 JR |
1311 | if (WARN_ON_ONCE(group == NULL)) |
1312 | return ERR_PTR(-EINVAL); | |
1313 | ||
104a1c13 AW |
1314 | if (IS_ERR(group)) |
1315 | return group; | |
1316 | ||
1228236d JR |
1317 | /* |
1318 | * Try to allocate a default domain - needs support from the | |
1319 | * IOMMU driver. | |
1320 | */ | |
1321 | if (!group->default_domain) { | |
fccb4e3b WD |
1322 | struct iommu_domain *dom; |
1323 | ||
1324 | dom = __iommu_domain_alloc(dev->bus, iommu_def_domain_type); | |
1325 | if (!dom && iommu_def_domain_type != IOMMU_DOMAIN_DMA) { | |
fccb4e3b | 1326 | dom = __iommu_domain_alloc(dev->bus, IOMMU_DOMAIN_DMA); |
8bc32a28 JR |
1327 | if (dom) { |
1328 | dev_warn(dev, | |
1329 | "failed to allocate default IOMMU domain of type %u; falling back to IOMMU_DOMAIN_DMA", | |
1330 | iommu_def_domain_type); | |
1331 | } | |
fccb4e3b WD |
1332 | } |
1333 | ||
1334 | group->default_domain = dom; | |
eebb8034 | 1335 | if (!group->domain) |
fccb4e3b | 1336 | group->domain = dom; |
68a6efe8 ZL |
1337 | |
1338 | if (dom && !iommu_dma_strict) { | |
1339 | int attr = 1; | |
1340 | iommu_domain_set_attr(dom, | |
1341 | DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE, | |
1342 | &attr); | |
1343 | } | |
1228236d JR |
1344 | } |
1345 | ||
104a1c13 AW |
1346 | ret = iommu_group_add_device(group, dev); |
1347 | if (ret) { | |
1348 | iommu_group_put(group); | |
1349 | return ERR_PTR(ret); | |
1350 | } | |
1351 | ||
1352 | return group; | |
1353 | } | |
1354 | ||
6827ca83 JR |
1355 | struct iommu_domain *iommu_group_default_domain(struct iommu_group *group) |
1356 | { | |
1357 | return group->default_domain; | |
1358 | } | |
1359 | ||
d72e31c9 | 1360 | static int add_iommu_group(struct device *dev, void *data) |
1460432c | 1361 | { |
cc5aed44 | 1362 | int ret = iommu_probe_device(dev); |
38667f18 JR |
1363 | |
1364 | /* | |
1365 | * We ignore -ENODEV errors for now, as they just mean that the | |
1366 | * device is not translated by an IOMMU. We still care about | |
1367 | * other errors and fail to initialize when they happen. | |
1368 | */ | |
1369 | if (ret == -ENODEV) | |
1370 | ret = 0; | |
1371 | ||
1372 | return ret; | |
1460432c AW |
1373 | } |
1374 | ||
8da30142 JR |
1375 | static int remove_iommu_group(struct device *dev, void *data) |
1376 | { | |
cc5aed44 | 1377 | iommu_release_device(dev); |
1460432c AW |
1378 | |
1379 | return 0; | |
1380 | } | |
1381 | ||
d72e31c9 AW |
1382 | static int iommu_bus_notifier(struct notifier_block *nb, |
1383 | unsigned long action, void *data) | |
1460432c | 1384 | { |
cc5aed44 | 1385 | unsigned long group_action = 0; |
1460432c | 1386 | struct device *dev = data; |
d72e31c9 | 1387 | struct iommu_group *group; |
d72e31c9 AW |
1388 | |
1389 | /* | |
1390 | * ADD/DEL call into iommu driver ops if provided, which may | |
1391 | * result in ADD/DEL notifiers to group->notifier | |
1392 | */ | |
1393 | if (action == BUS_NOTIFY_ADD_DEVICE) { | |
cc5aed44 | 1394 | int ret; |
3ba8775f | 1395 | |
cc5aed44 JR |
1396 | ret = iommu_probe_device(dev); |
1397 | return (ret) ? NOTIFY_DONE : NOTIFY_OK; | |
843cb6dc | 1398 | } else if (action == BUS_NOTIFY_REMOVED_DEVICE) { |
cc5aed44 JR |
1399 | iommu_release_device(dev); |
1400 | return NOTIFY_OK; | |
d72e31c9 | 1401 | } |
1460432c | 1402 | |
d72e31c9 AW |
1403 | /* |
1404 | * Remaining BUS_NOTIFYs get filtered and republished to the | |
1405 | * group, if anyone is listening | |
1406 | */ | |
1407 | group = iommu_group_get(dev); | |
1408 | if (!group) | |
1409 | return 0; | |
1460432c | 1410 | |
d72e31c9 AW |
1411 | switch (action) { |
1412 | case BUS_NOTIFY_BIND_DRIVER: | |
1413 | group_action = IOMMU_GROUP_NOTIFY_BIND_DRIVER; | |
1414 | break; | |
1415 | case BUS_NOTIFY_BOUND_DRIVER: | |
1416 | group_action = IOMMU_GROUP_NOTIFY_BOUND_DRIVER; | |
1417 | break; | |
1418 | case BUS_NOTIFY_UNBIND_DRIVER: | |
1419 | group_action = IOMMU_GROUP_NOTIFY_UNBIND_DRIVER; | |
1420 | break; | |
1421 | case BUS_NOTIFY_UNBOUND_DRIVER: | |
1422 | group_action = IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER; | |
1423 | break; | |
1424 | } | |
1460432c | 1425 | |
d72e31c9 AW |
1426 | if (group_action) |
1427 | blocking_notifier_call_chain(&group->notifier, | |
1428 | group_action, dev); | |
1460432c | 1429 | |
d72e31c9 | 1430 | iommu_group_put(group); |
1460432c AW |
1431 | return 0; |
1432 | } | |
1433 | ||
fb3e3065 | 1434 | static int iommu_bus_init(struct bus_type *bus, const struct iommu_ops *ops) |
ff21776d | 1435 | { |
fb3e3065 MS |
1436 | int err; |
1437 | struct notifier_block *nb; | |
b22f6434 | 1438 | |
fb3e3065 MS |
1439 | nb = kzalloc(sizeof(struct notifier_block), GFP_KERNEL); |
1440 | if (!nb) | |
1441 | return -ENOMEM; | |
1442 | ||
1443 | nb->notifier_call = iommu_bus_notifier; | |
1444 | ||
1445 | err = bus_register_notifier(bus, nb); | |
8da30142 JR |
1446 | if (err) |
1447 | goto out_free; | |
d7da6bdc | 1448 | |
8cec63e5 | 1449 | err = bus_for_each_dev(bus, NULL, NULL, add_iommu_group); |
8da30142 JR |
1450 | if (err) |
1451 | goto out_err; | |
1452 | ||
d7da6bdc HS |
1453 | |
1454 | return 0; | |
8da30142 JR |
1455 | |
1456 | out_err: | |
1457 | /* Clean up */ | |
8cec63e5 | 1458 | bus_for_each_dev(bus, NULL, NULL, remove_iommu_group); |
8da30142 JR |
1459 | bus_unregister_notifier(bus, nb); |
1460 | ||
1461 | out_free: | |
1462 | kfree(nb); | |
1463 | ||
1464 | return err; | |
ff21776d | 1465 | } |
fc2100eb | 1466 | |
ff21776d JR |
1467 | /** |
1468 | * bus_set_iommu - set iommu-callbacks for the bus | |
1469 | * @bus: bus. | |
1470 | * @ops: the callbacks provided by the iommu-driver | |
1471 | * | |
1472 | * This function is called by an iommu driver to set the iommu methods | |
1473 | * used for a particular bus. Drivers for devices on that bus can use | |
1474 | * the iommu-api after these ops are registered. | |
1475 | * This special function is needed because IOMMUs are usually devices on | |
1476 | * the bus itself, so the iommu drivers are not initialized when the bus | |
1477 | * is set up. With this function the iommu-driver can set the iommu-ops | |
1478 | * afterwards. | |
1479 | */ | |
b22f6434 | 1480 | int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops) |
fc2100eb | 1481 | { |
d7da6bdc HS |
1482 | int err; |
1483 | ||
ff21776d JR |
1484 | if (bus->iommu_ops != NULL) |
1485 | return -EBUSY; | |
fc2100eb | 1486 | |
ff21776d JR |
1487 | bus->iommu_ops = ops; |
1488 | ||
1489 | /* Do IOMMU specific setup for this bus-type */ | |
d7da6bdc HS |
1490 | err = iommu_bus_init(bus, ops); |
1491 | if (err) | |
1492 | bus->iommu_ops = NULL; | |
1493 | ||
1494 | return err; | |
fc2100eb | 1495 | } |
ff21776d | 1496 | EXPORT_SYMBOL_GPL(bus_set_iommu); |
fc2100eb | 1497 | |
a1b60c1c | 1498 | bool iommu_present(struct bus_type *bus) |
fc2100eb | 1499 | { |
94441c3b | 1500 | return bus->iommu_ops != NULL; |
fc2100eb | 1501 | } |
a1b60c1c | 1502 | EXPORT_SYMBOL_GPL(iommu_present); |
fc2100eb | 1503 | |
3c0e0ca0 JR |
1504 | bool iommu_capable(struct bus_type *bus, enum iommu_cap cap) |
1505 | { | |
1506 | if (!bus->iommu_ops || !bus->iommu_ops->capable) | |
1507 | return false; | |
1508 | ||
1509 | return bus->iommu_ops->capable(cap); | |
1510 | } | |
1511 | EXPORT_SYMBOL_GPL(iommu_capable); | |
1512 | ||
4f3f8d9d OBC |
1513 | /** |
1514 | * iommu_set_fault_handler() - set a fault handler for an iommu domain | |
1515 | * @domain: iommu domain | |
1516 | * @handler: fault handler | |
77ca2332 | 1517 | * @token: user data, will be passed back to the fault handler |
0ed6d2d2 OBC |
1518 | * |
1519 | * This function should be used by IOMMU users which want to be notified | |
1520 | * whenever an IOMMU fault happens. | |
1521 | * | |
1522 | * The fault handler itself should return 0 on success, and an appropriate | |
1523 | * error code otherwise. | |
4f3f8d9d OBC |
1524 | */ |
1525 | void iommu_set_fault_handler(struct iommu_domain *domain, | |
77ca2332 OBC |
1526 | iommu_fault_handler_t handler, |
1527 | void *token) | |
4f3f8d9d OBC |
1528 | { |
1529 | BUG_ON(!domain); | |
1530 | ||
1531 | domain->handler = handler; | |
77ca2332 | 1532 | domain->handler_token = token; |
4f3f8d9d | 1533 | } |
30bd918c | 1534 | EXPORT_SYMBOL_GPL(iommu_set_fault_handler); |
4f3f8d9d | 1535 | |
53723dc5 JR |
1536 | static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus, |
1537 | unsigned type) | |
fc2100eb JR |
1538 | { |
1539 | struct iommu_domain *domain; | |
fc2100eb | 1540 | |
94441c3b | 1541 | if (bus == NULL || bus->iommu_ops == NULL) |
905d66c1 JR |
1542 | return NULL; |
1543 | ||
53723dc5 | 1544 | domain = bus->iommu_ops->domain_alloc(type); |
fc2100eb JR |
1545 | if (!domain) |
1546 | return NULL; | |
1547 | ||
8539c7c1 | 1548 | domain->ops = bus->iommu_ops; |
53723dc5 | 1549 | domain->type = type; |
d16e0faa RM |
1550 | /* Assume all sizes by default; the driver may override this later */ |
1551 | domain->pgsize_bitmap = bus->iommu_ops->pgsize_bitmap; | |
905d66c1 | 1552 | |
fc2100eb | 1553 | return domain; |
fc2100eb | 1554 | } |
fc2100eb | 1555 | |
53723dc5 JR |
1556 | struct iommu_domain *iommu_domain_alloc(struct bus_type *bus) |
1557 | { | |
1558 | return __iommu_domain_alloc(bus, IOMMU_DOMAIN_UNMANAGED); | |
fc2100eb JR |
1559 | } |
1560 | EXPORT_SYMBOL_GPL(iommu_domain_alloc); | |
1561 | ||
1562 | void iommu_domain_free(struct iommu_domain *domain) | |
1563 | { | |
89be34a1 | 1564 | domain->ops->domain_free(domain); |
fc2100eb JR |
1565 | } |
1566 | EXPORT_SYMBOL_GPL(iommu_domain_free); | |
1567 | ||
426a2738 JR |
1568 | static int __iommu_attach_device(struct iommu_domain *domain, |
1569 | struct device *dev) | |
fc2100eb | 1570 | { |
b54db778 | 1571 | int ret; |
e01d1913 BH |
1572 | if ((domain->ops->is_attach_deferred != NULL) && |
1573 | domain->ops->is_attach_deferred(domain, dev)) | |
1574 | return 0; | |
1575 | ||
e5aa7f00 JR |
1576 | if (unlikely(domain->ops->attach_dev == NULL)) |
1577 | return -ENODEV; | |
1578 | ||
b54db778 SK |
1579 | ret = domain->ops->attach_dev(domain, dev); |
1580 | if (!ret) | |
1581 | trace_attach_device_to_domain(dev); | |
1582 | return ret; | |
fc2100eb | 1583 | } |
426a2738 JR |
1584 | |
1585 | int iommu_attach_device(struct iommu_domain *domain, struct device *dev) | |
1586 | { | |
1587 | struct iommu_group *group; | |
1588 | int ret; | |
1589 | ||
1590 | group = iommu_group_get(dev); | |
9ae9df03 JC |
1591 | if (!group) |
1592 | return -ENODEV; | |
1593 | ||
426a2738 | 1594 | /* |
05f80300 | 1595 | * Lock the group to make sure the device-count doesn't |
426a2738 JR |
1596 | * change while we are attaching |
1597 | */ | |
1598 | mutex_lock(&group->mutex); | |
1599 | ret = -EINVAL; | |
1600 | if (iommu_group_device_count(group) != 1) | |
1601 | goto out_unlock; | |
1602 | ||
e39cb8a3 | 1603 | ret = __iommu_attach_group(domain, group); |
426a2738 JR |
1604 | |
1605 | out_unlock: | |
1606 | mutex_unlock(&group->mutex); | |
1607 | iommu_group_put(group); | |
1608 | ||
1609 | return ret; | |
1610 | } | |
fc2100eb JR |
1611 | EXPORT_SYMBOL_GPL(iommu_attach_device); |
1612 | ||
426a2738 JR |
1613 | static void __iommu_detach_device(struct iommu_domain *domain, |
1614 | struct device *dev) | |
fc2100eb | 1615 | { |
e01d1913 BH |
1616 | if ((domain->ops->is_attach_deferred != NULL) && |
1617 | domain->ops->is_attach_deferred(domain, dev)) | |
1618 | return; | |
1619 | ||
e5aa7f00 JR |
1620 | if (unlikely(domain->ops->detach_dev == NULL)) |
1621 | return; | |
1622 | ||
1623 | domain->ops->detach_dev(domain, dev); | |
69980630 | 1624 | trace_detach_device_from_domain(dev); |
fc2100eb | 1625 | } |
426a2738 JR |
1626 | |
1627 | void iommu_detach_device(struct iommu_domain *domain, struct device *dev) | |
1628 | { | |
1629 | struct iommu_group *group; | |
1630 | ||
1631 | group = iommu_group_get(dev); | |
9ae9df03 JC |
1632 | if (!group) |
1633 | return; | |
426a2738 JR |
1634 | |
1635 | mutex_lock(&group->mutex); | |
1636 | if (iommu_group_device_count(group) != 1) { | |
1637 | WARN_ON(1); | |
1638 | goto out_unlock; | |
1639 | } | |
1640 | ||
e39cb8a3 | 1641 | __iommu_detach_group(domain, group); |
426a2738 JR |
1642 | |
1643 | out_unlock: | |
1644 | mutex_unlock(&group->mutex); | |
1645 | iommu_group_put(group); | |
1646 | } | |
fc2100eb JR |
1647 | EXPORT_SYMBOL_GPL(iommu_detach_device); |
1648 | ||
2c1296d9 JR |
1649 | struct iommu_domain *iommu_get_domain_for_dev(struct device *dev) |
1650 | { | |
1651 | struct iommu_domain *domain; | |
1652 | struct iommu_group *group; | |
1653 | ||
1654 | group = iommu_group_get(dev); | |
1464d0b1 | 1655 | if (!group) |
2c1296d9 JR |
1656 | return NULL; |
1657 | ||
1658 | domain = group->domain; | |
1659 | ||
1660 | iommu_group_put(group); | |
1661 | ||
1662 | return domain; | |
1663 | } | |
1664 | EXPORT_SYMBOL_GPL(iommu_get_domain_for_dev); | |
fc2100eb | 1665 | |
d72e31c9 | 1666 | /* |
6af588fe RM |
1667 | * For IOMMU_DOMAIN_DMA implementations which already provide their own |
1668 | * guarantees that the group and its default domain are valid and correct. | |
1669 | */ | |
1670 | struct iommu_domain *iommu_get_dma_domain(struct device *dev) | |
1671 | { | |
1672 | return dev->iommu_group->default_domain; | |
1673 | } | |
1674 | ||
d72e31c9 | 1675 | /* |
35449adc | 1676 | * IOMMU groups are really the natural working unit of the IOMMU, but |
d72e31c9 AW |
1677 | * the IOMMU API works on domains and devices. Bridge that gap by |
1678 | * iterating over the devices in a group. Ideally we'd have a single | |
1679 | * device which represents the requestor ID of the group, but we also | |
1680 | * allow IOMMU drivers to create policy defined minimum sets, where | |
1681 | * the physical hardware may be able to distiguish members, but we | |
1682 | * wish to group them at a higher level (ex. untrusted multi-function | |
1683 | * PCI devices). Thus we attach each device. | |
1684 | */ | |
1685 | static int iommu_group_do_attach_device(struct device *dev, void *data) | |
1686 | { | |
1687 | struct iommu_domain *domain = data; | |
1688 | ||
426a2738 | 1689 | return __iommu_attach_device(domain, dev); |
d72e31c9 AW |
1690 | } |
1691 | ||
e39cb8a3 JR |
1692 | static int __iommu_attach_group(struct iommu_domain *domain, |
1693 | struct iommu_group *group) | |
1694 | { | |
1695 | int ret; | |
1696 | ||
1697 | if (group->default_domain && group->domain != group->default_domain) | |
1698 | return -EBUSY; | |
1699 | ||
1700 | ret = __iommu_group_for_each_dev(group, domain, | |
1701 | iommu_group_do_attach_device); | |
1702 | if (ret == 0) | |
1703 | group->domain = domain; | |
1704 | ||
1705 | return ret; | |
d72e31c9 AW |
1706 | } |
1707 | ||
1708 | int iommu_attach_group(struct iommu_domain *domain, struct iommu_group *group) | |
1709 | { | |
e39cb8a3 JR |
1710 | int ret; |
1711 | ||
1712 | mutex_lock(&group->mutex); | |
1713 | ret = __iommu_attach_group(domain, group); | |
1714 | mutex_unlock(&group->mutex); | |
1715 | ||
1716 | return ret; | |
d72e31c9 AW |
1717 | } |
1718 | EXPORT_SYMBOL_GPL(iommu_attach_group); | |
1719 | ||
1720 | static int iommu_group_do_detach_device(struct device *dev, void *data) | |
1721 | { | |
1722 | struct iommu_domain *domain = data; | |
1723 | ||
426a2738 | 1724 | __iommu_detach_device(domain, dev); |
d72e31c9 AW |
1725 | |
1726 | return 0; | |
1727 | } | |
1728 | ||
e39cb8a3 JR |
1729 | static void __iommu_detach_group(struct iommu_domain *domain, |
1730 | struct iommu_group *group) | |
1731 | { | |
1732 | int ret; | |
1733 | ||
1734 | if (!group->default_domain) { | |
1735 | __iommu_group_for_each_dev(group, domain, | |
1736 | iommu_group_do_detach_device); | |
1737 | group->domain = NULL; | |
1738 | return; | |
1739 | } | |
1740 | ||
1741 | if (group->domain == group->default_domain) | |
1742 | return; | |
1743 | ||
1744 | /* Detach by re-attaching to the default domain */ | |
1745 | ret = __iommu_group_for_each_dev(group, group->default_domain, | |
1746 | iommu_group_do_attach_device); | |
1747 | if (ret != 0) | |
1748 | WARN_ON(1); | |
1749 | else | |
1750 | group->domain = group->default_domain; | |
1751 | } | |
1752 | ||
d72e31c9 AW |
1753 | void iommu_detach_group(struct iommu_domain *domain, struct iommu_group *group) |
1754 | { | |
e39cb8a3 JR |
1755 | mutex_lock(&group->mutex); |
1756 | __iommu_detach_group(domain, group); | |
1757 | mutex_unlock(&group->mutex); | |
d72e31c9 AW |
1758 | } |
1759 | EXPORT_SYMBOL_GPL(iommu_detach_group); | |
1760 | ||
bb5547ac | 1761 | phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova) |
fc2100eb | 1762 | { |
e5aa7f00 JR |
1763 | if (unlikely(domain->ops->iova_to_phys == NULL)) |
1764 | return 0; | |
1765 | ||
1766 | return domain->ops->iova_to_phys(domain, iova); | |
fc2100eb JR |
1767 | } |
1768 | EXPORT_SYMBOL_GPL(iommu_iova_to_phys); | |
dbb9fd86 | 1769 | |
bd13969b AW |
1770 | static size_t iommu_pgsize(struct iommu_domain *domain, |
1771 | unsigned long addr_merge, size_t size) | |
1772 | { | |
1773 | unsigned int pgsize_idx; | |
1774 | size_t pgsize; | |
1775 | ||
1776 | /* Max page size that still fits into 'size' */ | |
1777 | pgsize_idx = __fls(size); | |
1778 | ||
1779 | /* need to consider alignment requirements ? */ | |
1780 | if (likely(addr_merge)) { | |
1781 | /* Max page size allowed by address */ | |
1782 | unsigned int align_pgsize_idx = __ffs(addr_merge); | |
1783 | pgsize_idx = min(pgsize_idx, align_pgsize_idx); | |
1784 | } | |
1785 | ||
1786 | /* build a mask of acceptable page sizes */ | |
1787 | pgsize = (1UL << (pgsize_idx + 1)) - 1; | |
1788 | ||
1789 | /* throw away page sizes not supported by the hardware */ | |
d16e0faa | 1790 | pgsize &= domain->pgsize_bitmap; |
bd13969b AW |
1791 | |
1792 | /* make sure we're still sane */ | |
1793 | BUG_ON(!pgsize); | |
1794 | ||
1795 | /* pick the biggest page */ | |
1796 | pgsize_idx = __fls(pgsize); | |
1797 | pgsize = 1UL << pgsize_idx; | |
1798 | ||
1799 | return pgsize; | |
1800 | } | |
1801 | ||
cefc53c7 | 1802 | int iommu_map(struct iommu_domain *domain, unsigned long iova, |
7d3002cc | 1803 | phys_addr_t paddr, size_t size, int prot) |
cefc53c7 | 1804 | { |
1d7ae53b | 1805 | const struct iommu_ops *ops = domain->ops; |
7d3002cc OBC |
1806 | unsigned long orig_iova = iova; |
1807 | unsigned int min_pagesz; | |
1808 | size_t orig_size = size; | |
06bfcaa9 | 1809 | phys_addr_t orig_paddr = paddr; |
7d3002cc | 1810 | int ret = 0; |
cefc53c7 | 1811 | |
1d7ae53b | 1812 | if (unlikely(ops->map == NULL || |
d16e0faa | 1813 | domain->pgsize_bitmap == 0UL)) |
e5aa7f00 | 1814 | return -ENODEV; |
cefc53c7 | 1815 | |
a10315e5 JR |
1816 | if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING))) |
1817 | return -EINVAL; | |
1818 | ||
7d3002cc | 1819 | /* find out the minimum page size supported */ |
d16e0faa | 1820 | min_pagesz = 1 << __ffs(domain->pgsize_bitmap); |
7d3002cc OBC |
1821 | |
1822 | /* | |
1823 | * both the virtual address and the physical one, as well as | |
1824 | * the size of the mapping, must be aligned (at least) to the | |
1825 | * size of the smallest page supported by the hardware | |
1826 | */ | |
1827 | if (!IS_ALIGNED(iova | paddr | size, min_pagesz)) { | |
abedb049 | 1828 | pr_err("unaligned: iova 0x%lx pa %pa size 0x%zx min_pagesz 0x%x\n", |
6197ca82 | 1829 | iova, &paddr, size, min_pagesz); |
7d3002cc OBC |
1830 | return -EINVAL; |
1831 | } | |
1832 | ||
abedb049 | 1833 | pr_debug("map: iova 0x%lx pa %pa size 0x%zx\n", iova, &paddr, size); |
7d3002cc OBC |
1834 | |
1835 | while (size) { | |
bd13969b | 1836 | size_t pgsize = iommu_pgsize(domain, iova | paddr, size); |
7d3002cc | 1837 | |
abedb049 | 1838 | pr_debug("mapping: iova 0x%lx pa %pa pgsize 0x%zx\n", |
6197ca82 | 1839 | iova, &paddr, pgsize); |
7d3002cc | 1840 | |
1d7ae53b | 1841 | ret = ops->map(domain, iova, paddr, pgsize, prot); |
7d3002cc OBC |
1842 | if (ret) |
1843 | break; | |
1844 | ||
1845 | iova += pgsize; | |
1846 | paddr += pgsize; | |
1847 | size -= pgsize; | |
1848 | } | |
1849 | ||
1d7ae53b DO |
1850 | if (ops->iotlb_sync_map) |
1851 | ops->iotlb_sync_map(domain); | |
1852 | ||
7d3002cc OBC |
1853 | /* unroll mapping in case something went wrong */ |
1854 | if (ret) | |
1855 | iommu_unmap(domain, orig_iova, orig_size - size); | |
e0be7c86 | 1856 | else |
06bfcaa9 | 1857 | trace_map(orig_iova, orig_paddr, orig_size); |
7d3002cc OBC |
1858 | |
1859 | return ret; | |
cefc53c7 JR |
1860 | } |
1861 | EXPORT_SYMBOL_GPL(iommu_map); | |
1862 | ||
add02cfd JR |
1863 | static size_t __iommu_unmap(struct iommu_domain *domain, |
1864 | unsigned long iova, size_t size, | |
a7d20dc1 | 1865 | struct iommu_iotlb_gather *iotlb_gather) |
cefc53c7 | 1866 | { |
add02cfd | 1867 | const struct iommu_ops *ops = domain->ops; |
7d3002cc | 1868 | size_t unmapped_page, unmapped = 0; |
6fd492fd | 1869 | unsigned long orig_iova = iova; |
add02cfd | 1870 | unsigned int min_pagesz; |
cefc53c7 | 1871 | |
add02cfd | 1872 | if (unlikely(ops->unmap == NULL || |
d16e0faa | 1873 | domain->pgsize_bitmap == 0UL)) |
c5611a87 | 1874 | return 0; |
e5aa7f00 | 1875 | |
a10315e5 | 1876 | if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING))) |
c5611a87 | 1877 | return 0; |
a10315e5 | 1878 | |
7d3002cc | 1879 | /* find out the minimum page size supported */ |
d16e0faa | 1880 | min_pagesz = 1 << __ffs(domain->pgsize_bitmap); |
7d3002cc OBC |
1881 | |
1882 | /* | |
1883 | * The virtual address, as well as the size of the mapping, must be | |
1884 | * aligned (at least) to the size of the smallest page supported | |
1885 | * by the hardware | |
1886 | */ | |
1887 | if (!IS_ALIGNED(iova | size, min_pagesz)) { | |
6197ca82 JP |
1888 | pr_err("unaligned: iova 0x%lx size 0x%zx min_pagesz 0x%x\n", |
1889 | iova, size, min_pagesz); | |
c5611a87 | 1890 | return 0; |
7d3002cc OBC |
1891 | } |
1892 | ||
6197ca82 | 1893 | pr_debug("unmap this: iova 0x%lx size 0x%zx\n", iova, size); |
7d3002cc OBC |
1894 | |
1895 | /* | |
1896 | * Keep iterating until we either unmap 'size' bytes (or more) | |
1897 | * or we hit an area that isn't mapped. | |
1898 | */ | |
1899 | while (unmapped < size) { | |
bd13969b | 1900 | size_t pgsize = iommu_pgsize(domain, iova, size - unmapped); |
7d3002cc | 1901 | |
56f8af5e | 1902 | unmapped_page = ops->unmap(domain, iova, pgsize, iotlb_gather); |
7d3002cc OBC |
1903 | if (!unmapped_page) |
1904 | break; | |
1905 | ||
6197ca82 JP |
1906 | pr_debug("unmapped: iova 0x%lx size 0x%zx\n", |
1907 | iova, unmapped_page); | |
7d3002cc OBC |
1908 | |
1909 | iova += unmapped_page; | |
1910 | unmapped += unmapped_page; | |
1911 | } | |
1912 | ||
db8614d3 | 1913 | trace_unmap(orig_iova, size, unmapped); |
7d3002cc | 1914 | return unmapped; |
cefc53c7 | 1915 | } |
add02cfd JR |
1916 | |
1917 | size_t iommu_unmap(struct iommu_domain *domain, | |
1918 | unsigned long iova, size_t size) | |
1919 | { | |
a7d20dc1 WD |
1920 | struct iommu_iotlb_gather iotlb_gather; |
1921 | size_t ret; | |
1922 | ||
1923 | iommu_iotlb_gather_init(&iotlb_gather); | |
1924 | ret = __iommu_unmap(domain, iova, size, &iotlb_gather); | |
1925 | iommu_tlb_sync(domain, &iotlb_gather); | |
1926 | ||
1927 | return ret; | |
add02cfd | 1928 | } |
cefc53c7 | 1929 | EXPORT_SYMBOL_GPL(iommu_unmap); |
1460432c | 1930 | |
add02cfd | 1931 | size_t iommu_unmap_fast(struct iommu_domain *domain, |
a7d20dc1 WD |
1932 | unsigned long iova, size_t size, |
1933 | struct iommu_iotlb_gather *iotlb_gather) | |
add02cfd | 1934 | { |
a7d20dc1 | 1935 | return __iommu_unmap(domain, iova, size, iotlb_gather); |
add02cfd JR |
1936 | } |
1937 | EXPORT_SYMBOL_GPL(iommu_unmap_fast); | |
1938 | ||
d88e61fa CH |
1939 | size_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova, |
1940 | struct scatterlist *sg, unsigned int nents, int prot) | |
315786eb | 1941 | { |
5d95f40e RM |
1942 | size_t len = 0, mapped = 0; |
1943 | phys_addr_t start; | |
1944 | unsigned int i = 0; | |
38ec010d | 1945 | int ret; |
315786eb | 1946 | |
5d95f40e RM |
1947 | while (i <= nents) { |
1948 | phys_addr_t s_phys = sg_phys(sg); | |
18f23409 | 1949 | |
5d95f40e RM |
1950 | if (len && s_phys != start + len) { |
1951 | ret = iommu_map(domain, iova + mapped, start, len, prot); | |
1952 | if (ret) | |
1953 | goto out_err; | |
18f23409 | 1954 | |
5d95f40e RM |
1955 | mapped += len; |
1956 | len = 0; | |
1957 | } | |
38ec010d | 1958 | |
5d95f40e RM |
1959 | if (len) { |
1960 | len += sg->length; | |
1961 | } else { | |
1962 | len = sg->length; | |
1963 | start = s_phys; | |
1964 | } | |
38ec010d | 1965 | |
5d95f40e RM |
1966 | if (++i < nents) |
1967 | sg = sg_next(sg); | |
315786eb OH |
1968 | } |
1969 | ||
1970 | return mapped; | |
38ec010d JR |
1971 | |
1972 | out_err: | |
1973 | /* undo mappings already done */ | |
1974 | iommu_unmap(domain, iova, mapped); | |
1975 | ||
1976 | return 0; | |
1977 | ||
315786eb | 1978 | } |
d88e61fa | 1979 | EXPORT_SYMBOL_GPL(iommu_map_sg); |
d7787d57 JR |
1980 | |
1981 | int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr, | |
80f97f0f | 1982 | phys_addr_t paddr, u64 size, int prot) |
d7787d57 JR |
1983 | { |
1984 | if (unlikely(domain->ops->domain_window_enable == NULL)) | |
1985 | return -ENODEV; | |
1986 | ||
80f97f0f VS |
1987 | return domain->ops->domain_window_enable(domain, wnd_nr, paddr, size, |
1988 | prot); | |
d7787d57 JR |
1989 | } |
1990 | EXPORT_SYMBOL_GPL(iommu_domain_window_enable); | |
1991 | ||
1992 | void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr) | |
1993 | { | |
1994 | if (unlikely(domain->ops->domain_window_disable == NULL)) | |
1995 | return; | |
1996 | ||
1997 | return domain->ops->domain_window_disable(domain, wnd_nr); | |
1998 | } | |
1999 | EXPORT_SYMBOL_GPL(iommu_domain_window_disable); | |
2000 | ||
207c6e36 JR |
2001 | /** |
2002 | * report_iommu_fault() - report about an IOMMU fault to the IOMMU framework | |
2003 | * @domain: the iommu domain where the fault has happened | |
2004 | * @dev: the device where the fault has happened | |
2005 | * @iova: the faulting address | |
2006 | * @flags: mmu fault flags (e.g. IOMMU_FAULT_READ/IOMMU_FAULT_WRITE/...) | |
2007 | * | |
2008 | * This function should be called by the low-level IOMMU implementations | |
2009 | * whenever IOMMU faults happen, to allow high-level users, that are | |
2010 | * interested in such events, to know about them. | |
2011 | * | |
2012 | * This event may be useful for several possible use cases: | |
2013 | * - mere logging of the event | |
2014 | * - dynamic TLB/PTE loading | |
2015 | * - if restarting of the faulting device is required | |
2016 | * | |
2017 | * Returns 0 on success and an appropriate error code otherwise (if dynamic | |
2018 | * PTE/TLB loading will one day be supported, implementations will be able | |
2019 | * to tell whether it succeeded or not according to this return value). | |
2020 | * | |
2021 | * Specifically, -ENOSYS is returned if a fault handler isn't installed | |
2022 | * (though fault handlers can also return -ENOSYS, in case they want to | |
2023 | * elicit the default behavior of the IOMMU drivers). | |
2024 | */ | |
2025 | int report_iommu_fault(struct iommu_domain *domain, struct device *dev, | |
2026 | unsigned long iova, int flags) | |
2027 | { | |
2028 | int ret = -ENOSYS; | |
2029 | ||
2030 | /* | |
2031 | * if upper layers showed interest and installed a fault handler, | |
2032 | * invoke it. | |
2033 | */ | |
2034 | if (domain->handler) | |
2035 | ret = domain->handler(domain, dev, iova, flags, | |
2036 | domain->handler_token); | |
2037 | ||
2038 | trace_io_page_fault(dev, iova, flags); | |
2039 | return ret; | |
2040 | } | |
2041 | EXPORT_SYMBOL_GPL(report_iommu_fault); | |
2042 | ||
d72e31c9 | 2043 | static int __init iommu_init(void) |
1460432c | 2044 | { |
d72e31c9 AW |
2045 | iommu_group_kset = kset_create_and_add("iommu_groups", |
2046 | NULL, kernel_kobj); | |
d72e31c9 AW |
2047 | BUG_ON(!iommu_group_kset); |
2048 | ||
bad614b2 GH |
2049 | iommu_debugfs_setup(); |
2050 | ||
d72e31c9 | 2051 | return 0; |
1460432c | 2052 | } |
d7ef9995 | 2053 | core_initcall(iommu_init); |
0cd76dd1 JR |
2054 | |
2055 | int iommu_domain_get_attr(struct iommu_domain *domain, | |
2056 | enum iommu_attr attr, void *data) | |
2057 | { | |
0ff64f80 | 2058 | struct iommu_domain_geometry *geometry; |
d2e12160 | 2059 | bool *paging; |
0ff64f80 JR |
2060 | int ret = 0; |
2061 | ||
2062 | switch (attr) { | |
2063 | case DOMAIN_ATTR_GEOMETRY: | |
2064 | geometry = data; | |
2065 | *geometry = domain->geometry; | |
2066 | ||
d2e12160 JR |
2067 | break; |
2068 | case DOMAIN_ATTR_PAGING: | |
2069 | paging = data; | |
d16e0faa | 2070 | *paging = (domain->pgsize_bitmap != 0UL); |
0ff64f80 JR |
2071 | break; |
2072 | default: | |
2073 | if (!domain->ops->domain_get_attr) | |
2074 | return -EINVAL; | |
0cd76dd1 | 2075 | |
0ff64f80 JR |
2076 | ret = domain->ops->domain_get_attr(domain, attr, data); |
2077 | } | |
2078 | ||
2079 | return ret; | |
0cd76dd1 JR |
2080 | } |
2081 | EXPORT_SYMBOL_GPL(iommu_domain_get_attr); | |
2082 | ||
2083 | int iommu_domain_set_attr(struct iommu_domain *domain, | |
2084 | enum iommu_attr attr, void *data) | |
2085 | { | |
69356712 | 2086 | int ret = 0; |
69356712 JR |
2087 | |
2088 | switch (attr) { | |
69356712 JR |
2089 | default: |
2090 | if (domain->ops->domain_set_attr == NULL) | |
2091 | return -EINVAL; | |
2092 | ||
2093 | ret = domain->ops->domain_set_attr(domain, attr, data); | |
2094 | } | |
2095 | ||
2096 | return ret; | |
1460432c | 2097 | } |
0cd76dd1 | 2098 | EXPORT_SYMBOL_GPL(iommu_domain_set_attr); |
a1015c2b | 2099 | |
e5b5234a | 2100 | void iommu_get_resv_regions(struct device *dev, struct list_head *list) |
a1015c2b JR |
2101 | { |
2102 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
2103 | ||
e5b5234a EA |
2104 | if (ops && ops->get_resv_regions) |
2105 | ops->get_resv_regions(dev, list); | |
a1015c2b JR |
2106 | } |
2107 | ||
e5b5234a | 2108 | void iommu_put_resv_regions(struct device *dev, struct list_head *list) |
a1015c2b JR |
2109 | { |
2110 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
2111 | ||
e5b5234a EA |
2112 | if (ops && ops->put_resv_regions) |
2113 | ops->put_resv_regions(dev, list); | |
a1015c2b | 2114 | } |
d290f1e7 | 2115 | |
2b20cbba | 2116 | struct iommu_resv_region *iommu_alloc_resv_region(phys_addr_t start, |
9d3a4de4 RM |
2117 | size_t length, int prot, |
2118 | enum iommu_resv_type type) | |
2b20cbba EA |
2119 | { |
2120 | struct iommu_resv_region *region; | |
2121 | ||
2122 | region = kzalloc(sizeof(*region), GFP_KERNEL); | |
2123 | if (!region) | |
2124 | return NULL; | |
2125 | ||
2126 | INIT_LIST_HEAD(®ion->list); | |
2127 | region->start = start; | |
2128 | region->length = length; | |
2129 | region->prot = prot; | |
2130 | region->type = type; | |
2131 | return region; | |
a1015c2b | 2132 | } |
d290f1e7 | 2133 | |
7423e017 LB |
2134 | static int |
2135 | request_default_domain_for_dev(struct device *dev, unsigned long type) | |
d290f1e7 | 2136 | { |
7423e017 | 2137 | struct iommu_domain *domain; |
d290f1e7 JR |
2138 | struct iommu_group *group; |
2139 | int ret; | |
2140 | ||
2141 | /* Device must already be in a group before calling this function */ | |
57274ea2 LB |
2142 | group = iommu_group_get(dev); |
2143 | if (!group) | |
2144 | return -EINVAL; | |
d290f1e7 JR |
2145 | |
2146 | mutex_lock(&group->mutex); | |
2147 | ||
2148 | /* Check if the default domain is already direct mapped */ | |
2149 | ret = 0; | |
7423e017 | 2150 | if (group->default_domain && group->default_domain->type == type) |
d290f1e7 JR |
2151 | goto out; |
2152 | ||
2153 | /* Don't change mappings of existing devices */ | |
2154 | ret = -EBUSY; | |
2155 | if (iommu_group_device_count(group) != 1) | |
2156 | goto out; | |
2157 | ||
2158 | /* Allocate a direct mapped domain */ | |
2159 | ret = -ENOMEM; | |
7423e017 LB |
2160 | domain = __iommu_domain_alloc(dev->bus, type); |
2161 | if (!domain) | |
d290f1e7 JR |
2162 | goto out; |
2163 | ||
2164 | /* Attach the device to the domain */ | |
7423e017 | 2165 | ret = __iommu_attach_group(domain, group); |
d290f1e7 | 2166 | if (ret) { |
7423e017 | 2167 | iommu_domain_free(domain); |
d290f1e7 JR |
2168 | goto out; |
2169 | } | |
2170 | ||
7423e017 LB |
2171 | iommu_group_create_direct_mappings(group, dev); |
2172 | ||
d290f1e7 JR |
2173 | /* Make the direct mapped domain the default for this group */ |
2174 | if (group->default_domain) | |
2175 | iommu_domain_free(group->default_domain); | |
7423e017 | 2176 | group->default_domain = domain; |
d290f1e7 | 2177 | |
7423e017 LB |
2178 | dev_info(dev, "Using iommu %s mapping\n", |
2179 | type == IOMMU_DOMAIN_DMA ? "dma" : "direct"); | |
d290f1e7 JR |
2180 | |
2181 | ret = 0; | |
2182 | out: | |
2183 | mutex_unlock(&group->mutex); | |
2184 | iommu_group_put(group); | |
2185 | ||
2186 | return ret; | |
2187 | } | |
57f98d2f | 2188 | |
7423e017 LB |
2189 | /* Request that a device is direct mapped by the IOMMU */ |
2190 | int iommu_request_dm_for_dev(struct device *dev) | |
2191 | { | |
2192 | return request_default_domain_for_dev(dev, IOMMU_DOMAIN_IDENTITY); | |
2193 | } | |
2194 | ||
2195 | /* Request that a device can't be direct mapped by the IOMMU */ | |
2196 | int iommu_request_dma_domain_for_dev(struct device *dev) | |
2197 | { | |
2198 | return request_default_domain_for_dev(dev, IOMMU_DOMAIN_DMA); | |
2199 | } | |
2200 | ||
534766df | 2201 | const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode) |
e4f10ffe | 2202 | { |
e4f10ffe | 2203 | const struct iommu_ops *ops = NULL; |
d0f6f583 | 2204 | struct iommu_device *iommu; |
e4f10ffe | 2205 | |
d0f6f583 JR |
2206 | spin_lock(&iommu_device_lock); |
2207 | list_for_each_entry(iommu, &iommu_device_list, list) | |
2208 | if (iommu->fwnode == fwnode) { | |
2209 | ops = iommu->ops; | |
e4f10ffe LP |
2210 | break; |
2211 | } | |
d0f6f583 | 2212 | spin_unlock(&iommu_device_lock); |
e4f10ffe LP |
2213 | return ops; |
2214 | } | |
2215 | ||
57f98d2f RM |
2216 | int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode, |
2217 | const struct iommu_ops *ops) | |
2218 | { | |
b4ef725e | 2219 | struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); |
57f98d2f RM |
2220 | |
2221 | if (fwspec) | |
2222 | return ops == fwspec->ops ? 0 : -EINVAL; | |
2223 | ||
2224 | fwspec = kzalloc(sizeof(*fwspec), GFP_KERNEL); | |
2225 | if (!fwspec) | |
2226 | return -ENOMEM; | |
2227 | ||
2228 | of_node_get(to_of_node(iommu_fwnode)); | |
2229 | fwspec->iommu_fwnode = iommu_fwnode; | |
2230 | fwspec->ops = ops; | |
b4ef725e | 2231 | dev_iommu_fwspec_set(dev, fwspec); |
57f98d2f RM |
2232 | return 0; |
2233 | } | |
2234 | EXPORT_SYMBOL_GPL(iommu_fwspec_init); | |
2235 | ||
2236 | void iommu_fwspec_free(struct device *dev) | |
2237 | { | |
b4ef725e | 2238 | struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); |
57f98d2f RM |
2239 | |
2240 | if (fwspec) { | |
2241 | fwnode_handle_put(fwspec->iommu_fwnode); | |
2242 | kfree(fwspec); | |
b4ef725e | 2243 | dev_iommu_fwspec_set(dev, NULL); |
57f98d2f RM |
2244 | } |
2245 | } | |
2246 | EXPORT_SYMBOL_GPL(iommu_fwspec_free); | |
2247 | ||
2248 | int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids) | |
2249 | { | |
b4ef725e | 2250 | struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); |
57f98d2f RM |
2251 | size_t size; |
2252 | int i; | |
2253 | ||
2254 | if (!fwspec) | |
2255 | return -EINVAL; | |
2256 | ||
2257 | size = offsetof(struct iommu_fwspec, ids[fwspec->num_ids + num_ids]); | |
2258 | if (size > sizeof(*fwspec)) { | |
b4ef725e | 2259 | fwspec = krealloc(fwspec, size, GFP_KERNEL); |
57f98d2f RM |
2260 | if (!fwspec) |
2261 | return -ENOMEM; | |
909111ba | 2262 | |
b4ef725e | 2263 | dev_iommu_fwspec_set(dev, fwspec); |
57f98d2f RM |
2264 | } |
2265 | ||
2266 | for (i = 0; i < num_ids; i++) | |
2267 | fwspec->ids[fwspec->num_ids + i] = ids[i]; | |
2268 | ||
2269 | fwspec->num_ids += num_ids; | |
57f98d2f RM |
2270 | return 0; |
2271 | } | |
2272 | EXPORT_SYMBOL_GPL(iommu_fwspec_add_ids); | |
a3a19592 LB |
2273 | |
2274 | /* | |
2275 | * Per device IOMMU features. | |
2276 | */ | |
2277 | bool iommu_dev_has_feature(struct device *dev, enum iommu_dev_features feat) | |
2278 | { | |
2279 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
2280 | ||
2281 | if (ops && ops->dev_has_feat) | |
2282 | return ops->dev_has_feat(dev, feat); | |
2283 | ||
2284 | return false; | |
2285 | } | |
2286 | EXPORT_SYMBOL_GPL(iommu_dev_has_feature); | |
2287 | ||
2288 | int iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features feat) | |
2289 | { | |
2290 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
2291 | ||
2292 | if (ops && ops->dev_enable_feat) | |
2293 | return ops->dev_enable_feat(dev, feat); | |
2294 | ||
2295 | return -ENODEV; | |
2296 | } | |
2297 | EXPORT_SYMBOL_GPL(iommu_dev_enable_feature); | |
2298 | ||
2299 | /* | |
2300 | * The device drivers should do the necessary cleanups before calling this. | |
2301 | * For example, before disabling the aux-domain feature, the device driver | |
2302 | * should detach all aux-domains. Otherwise, this will return -EBUSY. | |
2303 | */ | |
2304 | int iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features feat) | |
2305 | { | |
2306 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
2307 | ||
2308 | if (ops && ops->dev_disable_feat) | |
2309 | return ops->dev_disable_feat(dev, feat); | |
2310 | ||
2311 | return -EBUSY; | |
2312 | } | |
2313 | EXPORT_SYMBOL_GPL(iommu_dev_disable_feature); | |
2314 | ||
2315 | bool iommu_dev_feature_enabled(struct device *dev, enum iommu_dev_features feat) | |
2316 | { | |
2317 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
2318 | ||
2319 | if (ops && ops->dev_feat_enabled) | |
2320 | return ops->dev_feat_enabled(dev, feat); | |
2321 | ||
2322 | return false; | |
2323 | } | |
2324 | EXPORT_SYMBOL_GPL(iommu_dev_feature_enabled); | |
2325 | ||
2326 | /* | |
2327 | * Aux-domain specific attach/detach. | |
2328 | * | |
2329 | * Only works if iommu_dev_feature_enabled(dev, IOMMU_DEV_FEAT_AUX) returns | |
2330 | * true. Also, as long as domains are attached to a device through this | |
2331 | * interface, any tries to call iommu_attach_device() should fail | |
2332 | * (iommu_detach_device() can't fail, so we fail when trying to re-attach). | |
2333 | * This should make us safe against a device being attached to a guest as a | |
2334 | * whole while there are still pasid users on it (aux and sva). | |
2335 | */ | |
2336 | int iommu_aux_attach_device(struct iommu_domain *domain, struct device *dev) | |
2337 | { | |
2338 | int ret = -ENODEV; | |
2339 | ||
2340 | if (domain->ops->aux_attach_dev) | |
2341 | ret = domain->ops->aux_attach_dev(domain, dev); | |
2342 | ||
2343 | if (!ret) | |
2344 | trace_attach_device_to_domain(dev); | |
2345 | ||
2346 | return ret; | |
2347 | } | |
2348 | EXPORT_SYMBOL_GPL(iommu_aux_attach_device); | |
2349 | ||
2350 | void iommu_aux_detach_device(struct iommu_domain *domain, struct device *dev) | |
2351 | { | |
2352 | if (domain->ops->aux_detach_dev) { | |
2353 | domain->ops->aux_detach_dev(domain, dev); | |
2354 | trace_detach_device_from_domain(dev); | |
2355 | } | |
2356 | } | |
2357 | EXPORT_SYMBOL_GPL(iommu_aux_detach_device); | |
2358 | ||
2359 | int iommu_aux_get_pasid(struct iommu_domain *domain, struct device *dev) | |
2360 | { | |
2361 | int ret = -ENODEV; | |
2362 | ||
2363 | if (domain->ops->aux_get_pasid) | |
2364 | ret = domain->ops->aux_get_pasid(domain, dev); | |
2365 | ||
2366 | return ret; | |
2367 | } | |
2368 | EXPORT_SYMBOL_GPL(iommu_aux_get_pasid); | |
26b25a2b JPB |
2369 | |
2370 | /** | |
2371 | * iommu_sva_bind_device() - Bind a process address space to a device | |
2372 | * @dev: the device | |
2373 | * @mm: the mm to bind, caller must hold a reference to it | |
2374 | * | |
2375 | * Create a bond between device and address space, allowing the device to access | |
2376 | * the mm using the returned PASID. If a bond already exists between @device and | |
2377 | * @mm, it is returned and an additional reference is taken. Caller must call | |
2378 | * iommu_sva_unbind_device() to release each reference. | |
2379 | * | |
2380 | * iommu_dev_enable_feature(dev, IOMMU_DEV_FEAT_SVA) must be called first, to | |
2381 | * initialize the required SVA features. | |
2382 | * | |
2383 | * On error, returns an ERR_PTR value. | |
2384 | */ | |
2385 | struct iommu_sva * | |
2386 | iommu_sva_bind_device(struct device *dev, struct mm_struct *mm, void *drvdata) | |
2387 | { | |
2388 | struct iommu_group *group; | |
2389 | struct iommu_sva *handle = ERR_PTR(-EINVAL); | |
2390 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
2391 | ||
2392 | if (!ops || !ops->sva_bind) | |
2393 | return ERR_PTR(-ENODEV); | |
2394 | ||
2395 | group = iommu_group_get(dev); | |
2396 | if (!group) | |
2397 | return ERR_PTR(-ENODEV); | |
2398 | ||
2399 | /* Ensure device count and domain don't change while we're binding */ | |
2400 | mutex_lock(&group->mutex); | |
2401 | ||
2402 | /* | |
2403 | * To keep things simple, SVA currently doesn't support IOMMU groups | |
2404 | * with more than one device. Existing SVA-capable systems are not | |
2405 | * affected by the problems that required IOMMU groups (lack of ACS | |
2406 | * isolation, device ID aliasing and other hardware issues). | |
2407 | */ | |
2408 | if (iommu_group_device_count(group) != 1) | |
2409 | goto out_unlock; | |
2410 | ||
2411 | handle = ops->sva_bind(dev, mm, drvdata); | |
2412 | ||
2413 | out_unlock: | |
2414 | mutex_unlock(&group->mutex); | |
2415 | iommu_group_put(group); | |
2416 | ||
2417 | return handle; | |
2418 | } | |
2419 | EXPORT_SYMBOL_GPL(iommu_sva_bind_device); | |
2420 | ||
2421 | /** | |
2422 | * iommu_sva_unbind_device() - Remove a bond created with iommu_sva_bind_device | |
2423 | * @handle: the handle returned by iommu_sva_bind_device() | |
2424 | * | |
2425 | * Put reference to a bond between device and address space. The device should | |
2426 | * not be issuing any more transaction for this PASID. All outstanding page | |
2427 | * requests for this PASID must have been flushed to the IOMMU. | |
2428 | * | |
2429 | * Returns 0 on success, or an error value | |
2430 | */ | |
2431 | void iommu_sva_unbind_device(struct iommu_sva *handle) | |
2432 | { | |
2433 | struct iommu_group *group; | |
2434 | struct device *dev = handle->dev; | |
2435 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
2436 | ||
2437 | if (!ops || !ops->sva_unbind) | |
2438 | return; | |
2439 | ||
2440 | group = iommu_group_get(dev); | |
2441 | if (!group) | |
2442 | return; | |
2443 | ||
2444 | mutex_lock(&group->mutex); | |
2445 | ops->sva_unbind(handle); | |
2446 | mutex_unlock(&group->mutex); | |
2447 | ||
2448 | iommu_group_put(group); | |
2449 | } | |
2450 | EXPORT_SYMBOL_GPL(iommu_sva_unbind_device); | |
2451 | ||
2452 | int iommu_sva_set_ops(struct iommu_sva *handle, | |
2453 | const struct iommu_sva_ops *sva_ops) | |
2454 | { | |
2455 | if (handle->ops && handle->ops != sva_ops) | |
2456 | return -EEXIST; | |
2457 | ||
2458 | handle->ops = sva_ops; | |
2459 | return 0; | |
2460 | } | |
2461 | EXPORT_SYMBOL_GPL(iommu_sva_set_ops); | |
2462 | ||
2463 | int iommu_sva_get_pasid(struct iommu_sva *handle) | |
2464 | { | |
2465 | const struct iommu_ops *ops = handle->dev->bus->iommu_ops; | |
2466 | ||
2467 | if (!ops || !ops->sva_get_pasid) | |
2468 | return IOMMU_PASID_INVALID; | |
2469 | ||
2470 | return ops->sva_get_pasid(handle); | |
2471 | } | |
2472 | EXPORT_SYMBOL_GPL(iommu_sva_get_pasid); |