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Commit | Line | Data |
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fc2100eb JR |
1 | /* |
2 | * Copyright (C) 2007-2008 Advanced Micro Devices, Inc. | |
63ce3ae8 | 3 | * Author: Joerg Roedel <jroedel@suse.de> |
fc2100eb JR |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License version 2 as published | |
7 | * by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
17 | */ | |
18 | ||
92e7066f | 19 | #define pr_fmt(fmt) "iommu: " fmt |
7d3002cc | 20 | |
905d66c1 | 21 | #include <linux/device.h> |
40998188 | 22 | #include <linux/kernel.h> |
fc2100eb JR |
23 | #include <linux/bug.h> |
24 | #include <linux/types.h> | |
60db4027 AM |
25 | #include <linux/module.h> |
26 | #include <linux/slab.h> | |
fc2100eb JR |
27 | #include <linux/errno.h> |
28 | #include <linux/iommu.h> | |
d72e31c9 AW |
29 | #include <linux/idr.h> |
30 | #include <linux/notifier.h> | |
31 | #include <linux/err.h> | |
104a1c13 | 32 | #include <linux/pci.h> |
f096c061 | 33 | #include <linux/bitops.h> |
57f98d2f | 34 | #include <linux/property.h> |
7f6db171 | 35 | #include <trace/events/iommu.h> |
d72e31c9 AW |
36 | |
37 | static struct kset *iommu_group_kset; | |
e38d1f13 | 38 | static DEFINE_IDA(iommu_group_ida); |
d72e31c9 | 39 | |
b22f6434 TR |
40 | struct iommu_callback_data { |
41 | const struct iommu_ops *ops; | |
42 | }; | |
43 | ||
d72e31c9 AW |
44 | struct iommu_group { |
45 | struct kobject kobj; | |
46 | struct kobject *devices_kobj; | |
47 | struct list_head devices; | |
48 | struct mutex mutex; | |
49 | struct blocking_notifier_head notifier; | |
50 | void *iommu_data; | |
51 | void (*iommu_data_release)(void *iommu_data); | |
52 | char *name; | |
53 | int id; | |
53723dc5 | 54 | struct iommu_domain *default_domain; |
e39cb8a3 | 55 | struct iommu_domain *domain; |
d72e31c9 AW |
56 | }; |
57 | ||
c09e22d5 | 58 | struct group_device { |
d72e31c9 AW |
59 | struct list_head list; |
60 | struct device *dev; | |
61 | char *name; | |
62 | }; | |
63 | ||
64 | struct iommu_group_attribute { | |
65 | struct attribute attr; | |
66 | ssize_t (*show)(struct iommu_group *group, char *buf); | |
67 | ssize_t (*store)(struct iommu_group *group, | |
68 | const char *buf, size_t count); | |
69 | }; | |
70 | ||
bc7d12b9 EA |
71 | static const char * const iommu_group_resv_type_string[] = { |
72 | [IOMMU_RESV_DIRECT] = "direct", | |
73 | [IOMMU_RESV_RESERVED] = "reserved", | |
74 | [IOMMU_RESV_MSI] = "msi", | |
75 | }; | |
76 | ||
d72e31c9 AW |
77 | #define IOMMU_GROUP_ATTR(_name, _mode, _show, _store) \ |
78 | struct iommu_group_attribute iommu_group_attr_##_name = \ | |
79 | __ATTR(_name, _mode, _show, _store) | |
fc2100eb | 80 | |
d72e31c9 AW |
81 | #define to_iommu_group_attr(_attr) \ |
82 | container_of(_attr, struct iommu_group_attribute, attr) | |
83 | #define to_iommu_group(_kobj) \ | |
84 | container_of(_kobj, struct iommu_group, kobj) | |
fc2100eb | 85 | |
b0119e87 JR |
86 | static LIST_HEAD(iommu_device_list); |
87 | static DEFINE_SPINLOCK(iommu_device_lock); | |
88 | ||
89 | int iommu_device_register(struct iommu_device *iommu) | |
90 | { | |
91 | spin_lock(&iommu_device_lock); | |
92 | list_add_tail(&iommu->list, &iommu_device_list); | |
93 | spin_unlock(&iommu_device_lock); | |
94 | ||
95 | return 0; | |
96 | } | |
97 | ||
98 | void iommu_device_unregister(struct iommu_device *iommu) | |
99 | { | |
100 | spin_lock(&iommu_device_lock); | |
101 | list_del(&iommu->list); | |
102 | spin_unlock(&iommu_device_lock); | |
103 | } | |
104 | ||
53723dc5 JR |
105 | static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus, |
106 | unsigned type); | |
e39cb8a3 JR |
107 | static int __iommu_attach_device(struct iommu_domain *domain, |
108 | struct device *dev); | |
109 | static int __iommu_attach_group(struct iommu_domain *domain, | |
110 | struct iommu_group *group); | |
111 | static void __iommu_detach_group(struct iommu_domain *domain, | |
112 | struct iommu_group *group); | |
53723dc5 | 113 | |
d72e31c9 AW |
114 | static ssize_t iommu_group_attr_show(struct kobject *kobj, |
115 | struct attribute *__attr, char *buf) | |
1460432c | 116 | { |
d72e31c9 AW |
117 | struct iommu_group_attribute *attr = to_iommu_group_attr(__attr); |
118 | struct iommu_group *group = to_iommu_group(kobj); | |
119 | ssize_t ret = -EIO; | |
1460432c | 120 | |
d72e31c9 AW |
121 | if (attr->show) |
122 | ret = attr->show(group, buf); | |
123 | return ret; | |
124 | } | |
125 | ||
126 | static ssize_t iommu_group_attr_store(struct kobject *kobj, | |
127 | struct attribute *__attr, | |
128 | const char *buf, size_t count) | |
129 | { | |
130 | struct iommu_group_attribute *attr = to_iommu_group_attr(__attr); | |
131 | struct iommu_group *group = to_iommu_group(kobj); | |
132 | ssize_t ret = -EIO; | |
1460432c | 133 | |
d72e31c9 AW |
134 | if (attr->store) |
135 | ret = attr->store(group, buf, count); | |
136 | return ret; | |
1460432c | 137 | } |
1460432c | 138 | |
d72e31c9 AW |
139 | static const struct sysfs_ops iommu_group_sysfs_ops = { |
140 | .show = iommu_group_attr_show, | |
141 | .store = iommu_group_attr_store, | |
142 | }; | |
1460432c | 143 | |
d72e31c9 AW |
144 | static int iommu_group_create_file(struct iommu_group *group, |
145 | struct iommu_group_attribute *attr) | |
146 | { | |
147 | return sysfs_create_file(&group->kobj, &attr->attr); | |
1460432c | 148 | } |
1460432c | 149 | |
d72e31c9 AW |
150 | static void iommu_group_remove_file(struct iommu_group *group, |
151 | struct iommu_group_attribute *attr) | |
152 | { | |
153 | sysfs_remove_file(&group->kobj, &attr->attr); | |
154 | } | |
155 | ||
156 | static ssize_t iommu_group_show_name(struct iommu_group *group, char *buf) | |
157 | { | |
158 | return sprintf(buf, "%s\n", group->name); | |
159 | } | |
160 | ||
6c65fb31 EA |
161 | /** |
162 | * iommu_insert_resv_region - Insert a new region in the | |
163 | * list of reserved regions. | |
164 | * @new: new region to insert | |
165 | * @regions: list of regions | |
166 | * | |
167 | * The new element is sorted by address with respect to the other | |
168 | * regions of the same type. In case it overlaps with another | |
169 | * region of the same type, regions are merged. In case it | |
170 | * overlaps with another region of different type, regions are | |
171 | * not merged. | |
172 | */ | |
173 | static int iommu_insert_resv_region(struct iommu_resv_region *new, | |
174 | struct list_head *regions) | |
175 | { | |
176 | struct iommu_resv_region *region; | |
177 | phys_addr_t start = new->start; | |
178 | phys_addr_t end = new->start + new->length - 1; | |
179 | struct list_head *pos = regions->next; | |
180 | ||
181 | while (pos != regions) { | |
182 | struct iommu_resv_region *entry = | |
183 | list_entry(pos, struct iommu_resv_region, list); | |
184 | phys_addr_t a = entry->start; | |
185 | phys_addr_t b = entry->start + entry->length - 1; | |
186 | int type = entry->type; | |
187 | ||
188 | if (end < a) { | |
189 | goto insert; | |
190 | } else if (start > b) { | |
191 | pos = pos->next; | |
192 | } else if ((start >= a) && (end <= b)) { | |
193 | if (new->type == type) | |
194 | goto done; | |
195 | else | |
196 | pos = pos->next; | |
197 | } else { | |
198 | if (new->type == type) { | |
199 | phys_addr_t new_start = min(a, start); | |
200 | phys_addr_t new_end = max(b, end); | |
201 | ||
202 | list_del(&entry->list); | |
203 | entry->start = new_start; | |
204 | entry->length = new_end - new_start + 1; | |
205 | iommu_insert_resv_region(entry, regions); | |
206 | } else { | |
207 | pos = pos->next; | |
208 | } | |
209 | } | |
210 | } | |
211 | insert: | |
212 | region = iommu_alloc_resv_region(new->start, new->length, | |
213 | new->prot, new->type); | |
214 | if (!region) | |
215 | return -ENOMEM; | |
216 | ||
217 | list_add_tail(®ion->list, pos); | |
218 | done: | |
219 | return 0; | |
220 | } | |
221 | ||
222 | static int | |
223 | iommu_insert_device_resv_regions(struct list_head *dev_resv_regions, | |
224 | struct list_head *group_resv_regions) | |
225 | { | |
226 | struct iommu_resv_region *entry; | |
a514a6e2 | 227 | int ret = 0; |
6c65fb31 EA |
228 | |
229 | list_for_each_entry(entry, dev_resv_regions, list) { | |
230 | ret = iommu_insert_resv_region(entry, group_resv_regions); | |
231 | if (ret) | |
232 | break; | |
233 | } | |
234 | return ret; | |
235 | } | |
236 | ||
237 | int iommu_get_group_resv_regions(struct iommu_group *group, | |
238 | struct list_head *head) | |
239 | { | |
8d2932dd | 240 | struct group_device *device; |
6c65fb31 EA |
241 | int ret = 0; |
242 | ||
243 | mutex_lock(&group->mutex); | |
244 | list_for_each_entry(device, &group->devices, list) { | |
245 | struct list_head dev_resv_regions; | |
246 | ||
247 | INIT_LIST_HEAD(&dev_resv_regions); | |
248 | iommu_get_resv_regions(device->dev, &dev_resv_regions); | |
249 | ret = iommu_insert_device_resv_regions(&dev_resv_regions, head); | |
250 | iommu_put_resv_regions(device->dev, &dev_resv_regions); | |
251 | if (ret) | |
252 | break; | |
253 | } | |
254 | mutex_unlock(&group->mutex); | |
255 | return ret; | |
256 | } | |
257 | EXPORT_SYMBOL_GPL(iommu_get_group_resv_regions); | |
258 | ||
bc7d12b9 EA |
259 | static ssize_t iommu_group_show_resv_regions(struct iommu_group *group, |
260 | char *buf) | |
261 | { | |
262 | struct iommu_resv_region *region, *next; | |
263 | struct list_head group_resv_regions; | |
264 | char *str = buf; | |
265 | ||
266 | INIT_LIST_HEAD(&group_resv_regions); | |
267 | iommu_get_group_resv_regions(group, &group_resv_regions); | |
268 | ||
269 | list_for_each_entry_safe(region, next, &group_resv_regions, list) { | |
270 | str += sprintf(str, "0x%016llx 0x%016llx %s\n", | |
271 | (long long int)region->start, | |
272 | (long long int)(region->start + | |
273 | region->length - 1), | |
274 | iommu_group_resv_type_string[region->type]); | |
275 | kfree(region); | |
276 | } | |
277 | ||
278 | return (str - buf); | |
279 | } | |
280 | ||
d72e31c9 AW |
281 | static IOMMU_GROUP_ATTR(name, S_IRUGO, iommu_group_show_name, NULL); |
282 | ||
bc7d12b9 EA |
283 | static IOMMU_GROUP_ATTR(reserved_regions, 0444, |
284 | iommu_group_show_resv_regions, NULL); | |
285 | ||
d72e31c9 AW |
286 | static void iommu_group_release(struct kobject *kobj) |
287 | { | |
288 | struct iommu_group *group = to_iommu_group(kobj); | |
289 | ||
269aa808 JR |
290 | pr_debug("Releasing group %d\n", group->id); |
291 | ||
d72e31c9 AW |
292 | if (group->iommu_data_release) |
293 | group->iommu_data_release(group->iommu_data); | |
294 | ||
feccf398 | 295 | ida_simple_remove(&iommu_group_ida, group->id); |
d72e31c9 | 296 | |
53723dc5 JR |
297 | if (group->default_domain) |
298 | iommu_domain_free(group->default_domain); | |
299 | ||
d72e31c9 AW |
300 | kfree(group->name); |
301 | kfree(group); | |
302 | } | |
303 | ||
304 | static struct kobj_type iommu_group_ktype = { | |
305 | .sysfs_ops = &iommu_group_sysfs_ops, | |
306 | .release = iommu_group_release, | |
307 | }; | |
308 | ||
309 | /** | |
310 | * iommu_group_alloc - Allocate a new group | |
311 | * @name: Optional name to associate with group, visible in sysfs | |
312 | * | |
313 | * This function is called by an iommu driver to allocate a new iommu | |
314 | * group. The iommu group represents the minimum granularity of the iommu. | |
315 | * Upon successful return, the caller holds a reference to the supplied | |
316 | * group in order to hold the group until devices are added. Use | |
317 | * iommu_group_put() to release this extra reference count, allowing the | |
318 | * group to be automatically reclaimed once it has no devices or external | |
319 | * references. | |
320 | */ | |
321 | struct iommu_group *iommu_group_alloc(void) | |
1460432c | 322 | { |
d72e31c9 AW |
323 | struct iommu_group *group; |
324 | int ret; | |
325 | ||
326 | group = kzalloc(sizeof(*group), GFP_KERNEL); | |
327 | if (!group) | |
328 | return ERR_PTR(-ENOMEM); | |
329 | ||
330 | group->kobj.kset = iommu_group_kset; | |
331 | mutex_init(&group->mutex); | |
332 | INIT_LIST_HEAD(&group->devices); | |
333 | BLOCKING_INIT_NOTIFIER_HEAD(&group->notifier); | |
334 | ||
feccf398 HK |
335 | ret = ida_simple_get(&iommu_group_ida, 0, 0, GFP_KERNEL); |
336 | if (ret < 0) { | |
d72e31c9 | 337 | kfree(group); |
feccf398 | 338 | return ERR_PTR(ret); |
d72e31c9 | 339 | } |
feccf398 | 340 | group->id = ret; |
1460432c | 341 | |
d72e31c9 AW |
342 | ret = kobject_init_and_add(&group->kobj, &iommu_group_ktype, |
343 | NULL, "%d", group->id); | |
344 | if (ret) { | |
feccf398 | 345 | ida_simple_remove(&iommu_group_ida, group->id); |
d72e31c9 AW |
346 | kfree(group); |
347 | return ERR_PTR(ret); | |
348 | } | |
349 | ||
350 | group->devices_kobj = kobject_create_and_add("devices", &group->kobj); | |
351 | if (!group->devices_kobj) { | |
352 | kobject_put(&group->kobj); /* triggers .release & free */ | |
353 | return ERR_PTR(-ENOMEM); | |
354 | } | |
355 | ||
356 | /* | |
357 | * The devices_kobj holds a reference on the group kobject, so | |
358 | * as long as that exists so will the group. We can therefore | |
359 | * use the devices_kobj for reference counting. | |
360 | */ | |
361 | kobject_put(&group->kobj); | |
362 | ||
bc7d12b9 EA |
363 | ret = iommu_group_create_file(group, |
364 | &iommu_group_attr_reserved_regions); | |
365 | if (ret) | |
366 | return ERR_PTR(ret); | |
367 | ||
269aa808 JR |
368 | pr_debug("Allocated group %d\n", group->id); |
369 | ||
d72e31c9 AW |
370 | return group; |
371 | } | |
372 | EXPORT_SYMBOL_GPL(iommu_group_alloc); | |
373 | ||
aa16bea9 AK |
374 | struct iommu_group *iommu_group_get_by_id(int id) |
375 | { | |
376 | struct kobject *group_kobj; | |
377 | struct iommu_group *group; | |
378 | const char *name; | |
379 | ||
380 | if (!iommu_group_kset) | |
381 | return NULL; | |
382 | ||
383 | name = kasprintf(GFP_KERNEL, "%d", id); | |
384 | if (!name) | |
385 | return NULL; | |
386 | ||
387 | group_kobj = kset_find_obj(iommu_group_kset, name); | |
388 | kfree(name); | |
389 | ||
390 | if (!group_kobj) | |
391 | return NULL; | |
392 | ||
393 | group = container_of(group_kobj, struct iommu_group, kobj); | |
394 | BUG_ON(group->id != id); | |
395 | ||
396 | kobject_get(group->devices_kobj); | |
397 | kobject_put(&group->kobj); | |
398 | ||
399 | return group; | |
400 | } | |
401 | EXPORT_SYMBOL_GPL(iommu_group_get_by_id); | |
402 | ||
d72e31c9 AW |
403 | /** |
404 | * iommu_group_get_iommudata - retrieve iommu_data registered for a group | |
405 | * @group: the group | |
406 | * | |
407 | * iommu drivers can store data in the group for use when doing iommu | |
408 | * operations. This function provides a way to retrieve it. Caller | |
409 | * should hold a group reference. | |
410 | */ | |
411 | void *iommu_group_get_iommudata(struct iommu_group *group) | |
412 | { | |
413 | return group->iommu_data; | |
414 | } | |
415 | EXPORT_SYMBOL_GPL(iommu_group_get_iommudata); | |
416 | ||
417 | /** | |
418 | * iommu_group_set_iommudata - set iommu_data for a group | |
419 | * @group: the group | |
420 | * @iommu_data: new data | |
421 | * @release: release function for iommu_data | |
422 | * | |
423 | * iommu drivers can store data in the group for use when doing iommu | |
424 | * operations. This function provides a way to set the data after | |
425 | * the group has been allocated. Caller should hold a group reference. | |
426 | */ | |
427 | void iommu_group_set_iommudata(struct iommu_group *group, void *iommu_data, | |
428 | void (*release)(void *iommu_data)) | |
1460432c | 429 | { |
d72e31c9 AW |
430 | group->iommu_data = iommu_data; |
431 | group->iommu_data_release = release; | |
432 | } | |
433 | EXPORT_SYMBOL_GPL(iommu_group_set_iommudata); | |
1460432c | 434 | |
d72e31c9 AW |
435 | /** |
436 | * iommu_group_set_name - set name for a group | |
437 | * @group: the group | |
438 | * @name: name | |
439 | * | |
440 | * Allow iommu driver to set a name for a group. When set it will | |
441 | * appear in a name attribute file under the group in sysfs. | |
442 | */ | |
443 | int iommu_group_set_name(struct iommu_group *group, const char *name) | |
444 | { | |
445 | int ret; | |
446 | ||
447 | if (group->name) { | |
448 | iommu_group_remove_file(group, &iommu_group_attr_name); | |
449 | kfree(group->name); | |
450 | group->name = NULL; | |
451 | if (!name) | |
452 | return 0; | |
453 | } | |
454 | ||
455 | group->name = kstrdup(name, GFP_KERNEL); | |
456 | if (!group->name) | |
457 | return -ENOMEM; | |
458 | ||
459 | ret = iommu_group_create_file(group, &iommu_group_attr_name); | |
460 | if (ret) { | |
461 | kfree(group->name); | |
462 | group->name = NULL; | |
463 | return ret; | |
464 | } | |
1460432c AW |
465 | |
466 | return 0; | |
467 | } | |
d72e31c9 | 468 | EXPORT_SYMBOL_GPL(iommu_group_set_name); |
1460432c | 469 | |
beed2821 JR |
470 | static int iommu_group_create_direct_mappings(struct iommu_group *group, |
471 | struct device *dev) | |
472 | { | |
473 | struct iommu_domain *domain = group->default_domain; | |
e5b5234a | 474 | struct iommu_resv_region *entry; |
beed2821 JR |
475 | struct list_head mappings; |
476 | unsigned long pg_size; | |
477 | int ret = 0; | |
478 | ||
479 | if (!domain || domain->type != IOMMU_DOMAIN_DMA) | |
480 | return 0; | |
481 | ||
d16e0faa | 482 | BUG_ON(!domain->pgsize_bitmap); |
beed2821 | 483 | |
d16e0faa | 484 | pg_size = 1UL << __ffs(domain->pgsize_bitmap); |
beed2821 JR |
485 | INIT_LIST_HEAD(&mappings); |
486 | ||
e5b5234a | 487 | iommu_get_resv_regions(dev, &mappings); |
beed2821 JR |
488 | |
489 | /* We need to consider overlapping regions for different devices */ | |
490 | list_for_each_entry(entry, &mappings, list) { | |
491 | dma_addr_t start, end, addr; | |
492 | ||
e5b5234a EA |
493 | if (domain->ops->apply_resv_region) |
494 | domain->ops->apply_resv_region(dev, domain, entry); | |
33b21a6b | 495 | |
beed2821 JR |
496 | start = ALIGN(entry->start, pg_size); |
497 | end = ALIGN(entry->start + entry->length, pg_size); | |
498 | ||
544a25d9 EA |
499 | if (entry->type != IOMMU_RESV_DIRECT) |
500 | continue; | |
501 | ||
beed2821 JR |
502 | for (addr = start; addr < end; addr += pg_size) { |
503 | phys_addr_t phys_addr; | |
504 | ||
505 | phys_addr = iommu_iova_to_phys(domain, addr); | |
506 | if (phys_addr) | |
507 | continue; | |
508 | ||
509 | ret = iommu_map(domain, addr, addr, pg_size, entry->prot); | |
510 | if (ret) | |
511 | goto out; | |
512 | } | |
513 | ||
514 | } | |
515 | ||
516 | out: | |
e5b5234a | 517 | iommu_put_resv_regions(dev, &mappings); |
beed2821 JR |
518 | |
519 | return ret; | |
520 | } | |
521 | ||
d72e31c9 AW |
522 | /** |
523 | * iommu_group_add_device - add a device to an iommu group | |
524 | * @group: the group into which to add the device (reference should be held) | |
525 | * @dev: the device | |
526 | * | |
527 | * This function is called by an iommu driver to add a device into a | |
528 | * group. Adding a device increments the group reference count. | |
529 | */ | |
530 | int iommu_group_add_device(struct iommu_group *group, struct device *dev) | |
1460432c | 531 | { |
d72e31c9 | 532 | int ret, i = 0; |
c09e22d5 | 533 | struct group_device *device; |
d72e31c9 AW |
534 | |
535 | device = kzalloc(sizeof(*device), GFP_KERNEL); | |
536 | if (!device) | |
537 | return -ENOMEM; | |
538 | ||
539 | device->dev = dev; | |
1460432c | 540 | |
d72e31c9 | 541 | ret = sysfs_create_link(&dev->kobj, &group->kobj, "iommu_group"); |
797a8b4d RM |
542 | if (ret) |
543 | goto err_free_device; | |
d72e31c9 AW |
544 | |
545 | device->name = kasprintf(GFP_KERNEL, "%s", kobject_name(&dev->kobj)); | |
546 | rename: | |
547 | if (!device->name) { | |
797a8b4d RM |
548 | ret = -ENOMEM; |
549 | goto err_remove_link; | |
d72e31c9 | 550 | } |
1460432c | 551 | |
d72e31c9 AW |
552 | ret = sysfs_create_link_nowarn(group->devices_kobj, |
553 | &dev->kobj, device->name); | |
554 | if (ret) { | |
d72e31c9 AW |
555 | if (ret == -EEXIST && i >= 0) { |
556 | /* | |
557 | * Account for the slim chance of collision | |
558 | * and append an instance to the name. | |
559 | */ | |
797a8b4d | 560 | kfree(device->name); |
d72e31c9 AW |
561 | device->name = kasprintf(GFP_KERNEL, "%s.%d", |
562 | kobject_name(&dev->kobj), i++); | |
563 | goto rename; | |
564 | } | |
797a8b4d | 565 | goto err_free_name; |
d72e31c9 AW |
566 | } |
567 | ||
568 | kobject_get(group->devices_kobj); | |
569 | ||
570 | dev->iommu_group = group; | |
571 | ||
beed2821 JR |
572 | iommu_group_create_direct_mappings(group, dev); |
573 | ||
d72e31c9 AW |
574 | mutex_lock(&group->mutex); |
575 | list_add_tail(&device->list, &group->devices); | |
e39cb8a3 | 576 | if (group->domain) |
797a8b4d | 577 | ret = __iommu_attach_device(group->domain, dev); |
d72e31c9 | 578 | mutex_unlock(&group->mutex); |
797a8b4d RM |
579 | if (ret) |
580 | goto err_put_group; | |
d72e31c9 AW |
581 | |
582 | /* Notify any listeners about change to group. */ | |
583 | blocking_notifier_call_chain(&group->notifier, | |
584 | IOMMU_GROUP_NOTIFY_ADD_DEVICE, dev); | |
d1cf7e82 SK |
585 | |
586 | trace_add_device_to_group(group->id, dev); | |
269aa808 JR |
587 | |
588 | pr_info("Adding device %s to group %d\n", dev_name(dev), group->id); | |
589 | ||
1460432c | 590 | return 0; |
797a8b4d RM |
591 | |
592 | err_put_group: | |
593 | mutex_lock(&group->mutex); | |
594 | list_del(&device->list); | |
595 | mutex_unlock(&group->mutex); | |
596 | dev->iommu_group = NULL; | |
597 | kobject_put(group->devices_kobj); | |
598 | err_free_name: | |
599 | kfree(device->name); | |
600 | err_remove_link: | |
601 | sysfs_remove_link(&dev->kobj, "iommu_group"); | |
602 | err_free_device: | |
603 | kfree(device); | |
604 | pr_err("Failed to add device %s to group %d: %d\n", dev_name(dev), group->id, ret); | |
605 | return ret; | |
1460432c | 606 | } |
d72e31c9 | 607 | EXPORT_SYMBOL_GPL(iommu_group_add_device); |
1460432c | 608 | |
d72e31c9 AW |
609 | /** |
610 | * iommu_group_remove_device - remove a device from it's current group | |
611 | * @dev: device to be removed | |
612 | * | |
613 | * This function is called by an iommu driver to remove the device from | |
614 | * it's current group. This decrements the iommu group reference count. | |
615 | */ | |
616 | void iommu_group_remove_device(struct device *dev) | |
617 | { | |
618 | struct iommu_group *group = dev->iommu_group; | |
c09e22d5 | 619 | struct group_device *tmp_device, *device = NULL; |
d72e31c9 | 620 | |
269aa808 JR |
621 | pr_info("Removing device %s from group %d\n", dev_name(dev), group->id); |
622 | ||
d72e31c9 AW |
623 | /* Pre-notify listeners that a device is being removed. */ |
624 | blocking_notifier_call_chain(&group->notifier, | |
625 | IOMMU_GROUP_NOTIFY_DEL_DEVICE, dev); | |
626 | ||
627 | mutex_lock(&group->mutex); | |
628 | list_for_each_entry(tmp_device, &group->devices, list) { | |
629 | if (tmp_device->dev == dev) { | |
630 | device = tmp_device; | |
631 | list_del(&device->list); | |
632 | break; | |
633 | } | |
634 | } | |
635 | mutex_unlock(&group->mutex); | |
636 | ||
637 | if (!device) | |
638 | return; | |
639 | ||
640 | sysfs_remove_link(group->devices_kobj, device->name); | |
641 | sysfs_remove_link(&dev->kobj, "iommu_group"); | |
642 | ||
2e757086 SK |
643 | trace_remove_device_from_group(group->id, dev); |
644 | ||
d72e31c9 AW |
645 | kfree(device->name); |
646 | kfree(device); | |
647 | dev->iommu_group = NULL; | |
648 | kobject_put(group->devices_kobj); | |
649 | } | |
650 | EXPORT_SYMBOL_GPL(iommu_group_remove_device); | |
651 | ||
426a2738 JR |
652 | static int iommu_group_device_count(struct iommu_group *group) |
653 | { | |
c09e22d5 | 654 | struct group_device *entry; |
426a2738 JR |
655 | int ret = 0; |
656 | ||
657 | list_for_each_entry(entry, &group->devices, list) | |
658 | ret++; | |
659 | ||
660 | return ret; | |
661 | } | |
662 | ||
d72e31c9 AW |
663 | /** |
664 | * iommu_group_for_each_dev - iterate over each device in the group | |
665 | * @group: the group | |
666 | * @data: caller opaque data to be passed to callback function | |
667 | * @fn: caller supplied callback function | |
668 | * | |
669 | * This function is called by group users to iterate over group devices. | |
670 | * Callers should hold a reference count to the group during callback. | |
671 | * The group->mutex is held across callbacks, which will block calls to | |
672 | * iommu_group_add/remove_device. | |
673 | */ | |
e39cb8a3 JR |
674 | static int __iommu_group_for_each_dev(struct iommu_group *group, void *data, |
675 | int (*fn)(struct device *, void *)) | |
d72e31c9 | 676 | { |
c09e22d5 | 677 | struct group_device *device; |
d72e31c9 AW |
678 | int ret = 0; |
679 | ||
d72e31c9 AW |
680 | list_for_each_entry(device, &group->devices, list) { |
681 | ret = fn(device->dev, data); | |
682 | if (ret) | |
683 | break; | |
684 | } | |
e39cb8a3 JR |
685 | return ret; |
686 | } | |
687 | ||
688 | ||
689 | int iommu_group_for_each_dev(struct iommu_group *group, void *data, | |
690 | int (*fn)(struct device *, void *)) | |
691 | { | |
692 | int ret; | |
693 | ||
694 | mutex_lock(&group->mutex); | |
695 | ret = __iommu_group_for_each_dev(group, data, fn); | |
d72e31c9 | 696 | mutex_unlock(&group->mutex); |
e39cb8a3 | 697 | |
d72e31c9 AW |
698 | return ret; |
699 | } | |
700 | EXPORT_SYMBOL_GPL(iommu_group_for_each_dev); | |
701 | ||
702 | /** | |
703 | * iommu_group_get - Return the group for a device and increment reference | |
704 | * @dev: get the group that this device belongs to | |
705 | * | |
706 | * This function is called by iommu drivers and users to get the group | |
707 | * for the specified device. If found, the group is returned and the group | |
708 | * reference in incremented, else NULL. | |
709 | */ | |
710 | struct iommu_group *iommu_group_get(struct device *dev) | |
711 | { | |
712 | struct iommu_group *group = dev->iommu_group; | |
713 | ||
714 | if (group) | |
715 | kobject_get(group->devices_kobj); | |
716 | ||
717 | return group; | |
718 | } | |
719 | EXPORT_SYMBOL_GPL(iommu_group_get); | |
720 | ||
13f59a78 RM |
721 | /** |
722 | * iommu_group_ref_get - Increment reference on a group | |
723 | * @group: the group to use, must not be NULL | |
724 | * | |
725 | * This function is called by iommu drivers to take additional references on an | |
726 | * existing group. Returns the given group for convenience. | |
727 | */ | |
728 | struct iommu_group *iommu_group_ref_get(struct iommu_group *group) | |
729 | { | |
730 | kobject_get(group->devices_kobj); | |
731 | return group; | |
732 | } | |
733 | ||
d72e31c9 AW |
734 | /** |
735 | * iommu_group_put - Decrement group reference | |
736 | * @group: the group to use | |
737 | * | |
738 | * This function is called by iommu drivers and users to release the | |
739 | * iommu group. Once the reference count is zero, the group is released. | |
740 | */ | |
741 | void iommu_group_put(struct iommu_group *group) | |
742 | { | |
743 | if (group) | |
744 | kobject_put(group->devices_kobj); | |
745 | } | |
746 | EXPORT_SYMBOL_GPL(iommu_group_put); | |
747 | ||
748 | /** | |
749 | * iommu_group_register_notifier - Register a notifier for group changes | |
750 | * @group: the group to watch | |
751 | * @nb: notifier block to signal | |
752 | * | |
753 | * This function allows iommu group users to track changes in a group. | |
754 | * See include/linux/iommu.h for actions sent via this notifier. Caller | |
755 | * should hold a reference to the group throughout notifier registration. | |
756 | */ | |
757 | int iommu_group_register_notifier(struct iommu_group *group, | |
758 | struct notifier_block *nb) | |
759 | { | |
760 | return blocking_notifier_chain_register(&group->notifier, nb); | |
761 | } | |
762 | EXPORT_SYMBOL_GPL(iommu_group_register_notifier); | |
763 | ||
764 | /** | |
765 | * iommu_group_unregister_notifier - Unregister a notifier | |
766 | * @group: the group to watch | |
767 | * @nb: notifier block to signal | |
768 | * | |
769 | * Unregister a previously registered group notifier block. | |
770 | */ | |
771 | int iommu_group_unregister_notifier(struct iommu_group *group, | |
772 | struct notifier_block *nb) | |
773 | { | |
774 | return blocking_notifier_chain_unregister(&group->notifier, nb); | |
775 | } | |
776 | EXPORT_SYMBOL_GPL(iommu_group_unregister_notifier); | |
777 | ||
778 | /** | |
779 | * iommu_group_id - Return ID for a group | |
780 | * @group: the group to ID | |
781 | * | |
782 | * Return the unique ID for the group matching the sysfs group number. | |
783 | */ | |
784 | int iommu_group_id(struct iommu_group *group) | |
785 | { | |
786 | return group->id; | |
787 | } | |
788 | EXPORT_SYMBOL_GPL(iommu_group_id); | |
1460432c | 789 | |
f096c061 AW |
790 | static struct iommu_group *get_pci_alias_group(struct pci_dev *pdev, |
791 | unsigned long *devfns); | |
792 | ||
104a1c13 AW |
793 | /* |
794 | * To consider a PCI device isolated, we require ACS to support Source | |
795 | * Validation, Request Redirection, Completer Redirection, and Upstream | |
796 | * Forwarding. This effectively means that devices cannot spoof their | |
797 | * requester ID, requests and completions cannot be redirected, and all | |
798 | * transactions are forwarded upstream, even as it passes through a | |
799 | * bridge where the target device is downstream. | |
800 | */ | |
801 | #define REQ_ACS_FLAGS (PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF) | |
802 | ||
f096c061 AW |
803 | /* |
804 | * For multifunction devices which are not isolated from each other, find | |
805 | * all the other non-isolated functions and look for existing groups. For | |
806 | * each function, we also need to look for aliases to or from other devices | |
807 | * that may already have a group. | |
808 | */ | |
809 | static struct iommu_group *get_pci_function_alias_group(struct pci_dev *pdev, | |
810 | unsigned long *devfns) | |
811 | { | |
812 | struct pci_dev *tmp = NULL; | |
813 | struct iommu_group *group; | |
814 | ||
815 | if (!pdev->multifunction || pci_acs_enabled(pdev, REQ_ACS_FLAGS)) | |
816 | return NULL; | |
817 | ||
818 | for_each_pci_dev(tmp) { | |
819 | if (tmp == pdev || tmp->bus != pdev->bus || | |
820 | PCI_SLOT(tmp->devfn) != PCI_SLOT(pdev->devfn) || | |
821 | pci_acs_enabled(tmp, REQ_ACS_FLAGS)) | |
822 | continue; | |
823 | ||
824 | group = get_pci_alias_group(tmp, devfns); | |
825 | if (group) { | |
826 | pci_dev_put(tmp); | |
827 | return group; | |
828 | } | |
829 | } | |
830 | ||
831 | return NULL; | |
832 | } | |
833 | ||
834 | /* | |
338c3149 JL |
835 | * Look for aliases to or from the given device for existing groups. DMA |
836 | * aliases are only supported on the same bus, therefore the search | |
f096c061 AW |
837 | * space is quite small (especially since we're really only looking at pcie |
838 | * device, and therefore only expect multiple slots on the root complex or | |
839 | * downstream switch ports). It's conceivable though that a pair of | |
840 | * multifunction devices could have aliases between them that would cause a | |
841 | * loop. To prevent this, we use a bitmap to track where we've been. | |
842 | */ | |
843 | static struct iommu_group *get_pci_alias_group(struct pci_dev *pdev, | |
844 | unsigned long *devfns) | |
845 | { | |
846 | struct pci_dev *tmp = NULL; | |
847 | struct iommu_group *group; | |
848 | ||
849 | if (test_and_set_bit(pdev->devfn & 0xff, devfns)) | |
850 | return NULL; | |
851 | ||
852 | group = iommu_group_get(&pdev->dev); | |
853 | if (group) | |
854 | return group; | |
855 | ||
856 | for_each_pci_dev(tmp) { | |
857 | if (tmp == pdev || tmp->bus != pdev->bus) | |
858 | continue; | |
859 | ||
860 | /* We alias them or they alias us */ | |
338c3149 | 861 | if (pci_devs_are_dma_aliases(pdev, tmp)) { |
f096c061 AW |
862 | group = get_pci_alias_group(tmp, devfns); |
863 | if (group) { | |
864 | pci_dev_put(tmp); | |
865 | return group; | |
866 | } | |
867 | ||
868 | group = get_pci_function_alias_group(tmp, devfns); | |
869 | if (group) { | |
870 | pci_dev_put(tmp); | |
871 | return group; | |
872 | } | |
873 | } | |
874 | } | |
875 | ||
876 | return NULL; | |
877 | } | |
878 | ||
104a1c13 AW |
879 | struct group_for_pci_data { |
880 | struct pci_dev *pdev; | |
881 | struct iommu_group *group; | |
882 | }; | |
883 | ||
884 | /* | |
885 | * DMA alias iterator callback, return the last seen device. Stop and return | |
886 | * the IOMMU group if we find one along the way. | |
887 | */ | |
888 | static int get_pci_alias_or_group(struct pci_dev *pdev, u16 alias, void *opaque) | |
889 | { | |
890 | struct group_for_pci_data *data = opaque; | |
891 | ||
892 | data->pdev = pdev; | |
893 | data->group = iommu_group_get(&pdev->dev); | |
894 | ||
895 | return data->group != NULL; | |
896 | } | |
897 | ||
6eab556a JR |
898 | /* |
899 | * Generic device_group call-back function. It just allocates one | |
900 | * iommu-group per device. | |
901 | */ | |
902 | struct iommu_group *generic_device_group(struct device *dev) | |
903 | { | |
904 | struct iommu_group *group; | |
905 | ||
906 | group = iommu_group_alloc(); | |
907 | if (IS_ERR(group)) | |
908 | return NULL; | |
909 | ||
910 | return group; | |
911 | } | |
912 | ||
104a1c13 AW |
913 | /* |
914 | * Use standard PCI bus topology, isolation features, and DMA alias quirks | |
915 | * to find or create an IOMMU group for a device. | |
916 | */ | |
5e62292b | 917 | struct iommu_group *pci_device_group(struct device *dev) |
104a1c13 | 918 | { |
5e62292b | 919 | struct pci_dev *pdev = to_pci_dev(dev); |
104a1c13 AW |
920 | struct group_for_pci_data data; |
921 | struct pci_bus *bus; | |
922 | struct iommu_group *group = NULL; | |
f096c061 | 923 | u64 devfns[4] = { 0 }; |
104a1c13 | 924 | |
5e62292b JR |
925 | if (WARN_ON(!dev_is_pci(dev))) |
926 | return ERR_PTR(-EINVAL); | |
927 | ||
104a1c13 AW |
928 | /* |
929 | * Find the upstream DMA alias for the device. A device must not | |
930 | * be aliased due to topology in order to have its own IOMMU group. | |
931 | * If we find an alias along the way that already belongs to a | |
932 | * group, use it. | |
933 | */ | |
934 | if (pci_for_each_dma_alias(pdev, get_pci_alias_or_group, &data)) | |
935 | return data.group; | |
936 | ||
937 | pdev = data.pdev; | |
938 | ||
939 | /* | |
940 | * Continue upstream from the point of minimum IOMMU granularity | |
941 | * due to aliases to the point where devices are protected from | |
942 | * peer-to-peer DMA by PCI ACS. Again, if we find an existing | |
943 | * group, use it. | |
944 | */ | |
945 | for (bus = pdev->bus; !pci_is_root_bus(bus); bus = bus->parent) { | |
946 | if (!bus->self) | |
947 | continue; | |
948 | ||
949 | if (pci_acs_path_enabled(bus->self, NULL, REQ_ACS_FLAGS)) | |
950 | break; | |
951 | ||
952 | pdev = bus->self; | |
953 | ||
954 | group = iommu_group_get(&pdev->dev); | |
955 | if (group) | |
956 | return group; | |
957 | } | |
958 | ||
959 | /* | |
f096c061 AW |
960 | * Look for existing groups on device aliases. If we alias another |
961 | * device or another device aliases us, use the same group. | |
104a1c13 | 962 | */ |
f096c061 AW |
963 | group = get_pci_alias_group(pdev, (unsigned long *)devfns); |
964 | if (group) | |
965 | return group; | |
104a1c13 AW |
966 | |
967 | /* | |
f096c061 AW |
968 | * Look for existing groups on non-isolated functions on the same |
969 | * slot and aliases of those funcions, if any. No need to clear | |
970 | * the search bitmap, the tested devfns are still valid. | |
104a1c13 | 971 | */ |
f096c061 AW |
972 | group = get_pci_function_alias_group(pdev, (unsigned long *)devfns); |
973 | if (group) | |
974 | return group; | |
104a1c13 AW |
975 | |
976 | /* No shared group found, allocate new */ | |
53723dc5 | 977 | group = iommu_group_alloc(); |
409e553d DC |
978 | if (IS_ERR(group)) |
979 | return NULL; | |
980 | ||
53723dc5 | 981 | return group; |
104a1c13 AW |
982 | } |
983 | ||
984 | /** | |
985 | * iommu_group_get_for_dev - Find or create the IOMMU group for a device | |
986 | * @dev: target device | |
987 | * | |
988 | * This function is intended to be called by IOMMU drivers and extended to | |
989 | * support common, bus-defined algorithms when determining or creating the | |
990 | * IOMMU group for a device. On success, the caller will hold a reference | |
991 | * to the returned IOMMU group, which will already include the provided | |
992 | * device. The reference should be released with iommu_group_put(). | |
993 | */ | |
994 | struct iommu_group *iommu_group_get_for_dev(struct device *dev) | |
995 | { | |
46c6b2bc | 996 | const struct iommu_ops *ops = dev->bus->iommu_ops; |
c4a783b8 | 997 | struct iommu_group *group; |
104a1c13 AW |
998 | int ret; |
999 | ||
1000 | group = iommu_group_get(dev); | |
1001 | if (group) | |
1002 | return group; | |
1003 | ||
46c6b2bc | 1004 | group = ERR_PTR(-EINVAL); |
c4a783b8 | 1005 | |
46c6b2bc JR |
1006 | if (ops && ops->device_group) |
1007 | group = ops->device_group(dev); | |
104a1c13 AW |
1008 | |
1009 | if (IS_ERR(group)) | |
1010 | return group; | |
1011 | ||
1228236d JR |
1012 | /* |
1013 | * Try to allocate a default domain - needs support from the | |
1014 | * IOMMU driver. | |
1015 | */ | |
1016 | if (!group->default_domain) { | |
1017 | group->default_domain = __iommu_domain_alloc(dev->bus, | |
1018 | IOMMU_DOMAIN_DMA); | |
eebb8034 JR |
1019 | if (!group->domain) |
1020 | group->domain = group->default_domain; | |
1228236d JR |
1021 | } |
1022 | ||
104a1c13 AW |
1023 | ret = iommu_group_add_device(group, dev); |
1024 | if (ret) { | |
1025 | iommu_group_put(group); | |
1026 | return ERR_PTR(ret); | |
1027 | } | |
1028 | ||
1029 | return group; | |
1030 | } | |
1031 | ||
6827ca83 JR |
1032 | struct iommu_domain *iommu_group_default_domain(struct iommu_group *group) |
1033 | { | |
1034 | return group->default_domain; | |
1035 | } | |
1036 | ||
d72e31c9 | 1037 | static int add_iommu_group(struct device *dev, void *data) |
1460432c | 1038 | { |
b22f6434 TR |
1039 | struct iommu_callback_data *cb = data; |
1040 | const struct iommu_ops *ops = cb->ops; | |
38667f18 | 1041 | int ret; |
d72e31c9 AW |
1042 | |
1043 | if (!ops->add_device) | |
461bfb3f | 1044 | return 0; |
1460432c | 1045 | |
d72e31c9 AW |
1046 | WARN_ON(dev->iommu_group); |
1047 | ||
38667f18 JR |
1048 | ret = ops->add_device(dev); |
1049 | ||
1050 | /* | |
1051 | * We ignore -ENODEV errors for now, as they just mean that the | |
1052 | * device is not translated by an IOMMU. We still care about | |
1053 | * other errors and fail to initialize when they happen. | |
1054 | */ | |
1055 | if (ret == -ENODEV) | |
1056 | ret = 0; | |
1057 | ||
1058 | return ret; | |
1460432c AW |
1059 | } |
1060 | ||
8da30142 JR |
1061 | static int remove_iommu_group(struct device *dev, void *data) |
1062 | { | |
1063 | struct iommu_callback_data *cb = data; | |
1064 | const struct iommu_ops *ops = cb->ops; | |
1065 | ||
1066 | if (ops->remove_device && dev->iommu_group) | |
1067 | ops->remove_device(dev); | |
1460432c AW |
1068 | |
1069 | return 0; | |
1070 | } | |
1071 | ||
d72e31c9 AW |
1072 | static int iommu_bus_notifier(struct notifier_block *nb, |
1073 | unsigned long action, void *data) | |
1460432c AW |
1074 | { |
1075 | struct device *dev = data; | |
b22f6434 | 1076 | const struct iommu_ops *ops = dev->bus->iommu_ops; |
d72e31c9 AW |
1077 | struct iommu_group *group; |
1078 | unsigned long group_action = 0; | |
1079 | ||
1080 | /* | |
1081 | * ADD/DEL call into iommu driver ops if provided, which may | |
1082 | * result in ADD/DEL notifiers to group->notifier | |
1083 | */ | |
1084 | if (action == BUS_NOTIFY_ADD_DEVICE) { | |
1085 | if (ops->add_device) | |
1086 | return ops->add_device(dev); | |
843cb6dc | 1087 | } else if (action == BUS_NOTIFY_REMOVED_DEVICE) { |
d72e31c9 AW |
1088 | if (ops->remove_device && dev->iommu_group) { |
1089 | ops->remove_device(dev); | |
1090 | return 0; | |
1091 | } | |
1092 | } | |
1460432c | 1093 | |
d72e31c9 AW |
1094 | /* |
1095 | * Remaining BUS_NOTIFYs get filtered and republished to the | |
1096 | * group, if anyone is listening | |
1097 | */ | |
1098 | group = iommu_group_get(dev); | |
1099 | if (!group) | |
1100 | return 0; | |
1460432c | 1101 | |
d72e31c9 AW |
1102 | switch (action) { |
1103 | case BUS_NOTIFY_BIND_DRIVER: | |
1104 | group_action = IOMMU_GROUP_NOTIFY_BIND_DRIVER; | |
1105 | break; | |
1106 | case BUS_NOTIFY_BOUND_DRIVER: | |
1107 | group_action = IOMMU_GROUP_NOTIFY_BOUND_DRIVER; | |
1108 | break; | |
1109 | case BUS_NOTIFY_UNBIND_DRIVER: | |
1110 | group_action = IOMMU_GROUP_NOTIFY_UNBIND_DRIVER; | |
1111 | break; | |
1112 | case BUS_NOTIFY_UNBOUND_DRIVER: | |
1113 | group_action = IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER; | |
1114 | break; | |
1115 | } | |
1460432c | 1116 | |
d72e31c9 AW |
1117 | if (group_action) |
1118 | blocking_notifier_call_chain(&group->notifier, | |
1119 | group_action, dev); | |
1460432c | 1120 | |
d72e31c9 | 1121 | iommu_group_put(group); |
1460432c AW |
1122 | return 0; |
1123 | } | |
1124 | ||
fb3e3065 | 1125 | static int iommu_bus_init(struct bus_type *bus, const struct iommu_ops *ops) |
ff21776d | 1126 | { |
fb3e3065 MS |
1127 | int err; |
1128 | struct notifier_block *nb; | |
b22f6434 TR |
1129 | struct iommu_callback_data cb = { |
1130 | .ops = ops, | |
1131 | }; | |
1132 | ||
fb3e3065 MS |
1133 | nb = kzalloc(sizeof(struct notifier_block), GFP_KERNEL); |
1134 | if (!nb) | |
1135 | return -ENOMEM; | |
1136 | ||
1137 | nb->notifier_call = iommu_bus_notifier; | |
1138 | ||
1139 | err = bus_register_notifier(bus, nb); | |
8da30142 JR |
1140 | if (err) |
1141 | goto out_free; | |
d7da6bdc HS |
1142 | |
1143 | err = bus_for_each_dev(bus, NULL, &cb, add_iommu_group); | |
8da30142 JR |
1144 | if (err) |
1145 | goto out_err; | |
1146 | ||
d7da6bdc HS |
1147 | |
1148 | return 0; | |
8da30142 JR |
1149 | |
1150 | out_err: | |
1151 | /* Clean up */ | |
1152 | bus_for_each_dev(bus, NULL, &cb, remove_iommu_group); | |
1153 | bus_unregister_notifier(bus, nb); | |
1154 | ||
1155 | out_free: | |
1156 | kfree(nb); | |
1157 | ||
1158 | return err; | |
ff21776d | 1159 | } |
fc2100eb | 1160 | |
ff21776d JR |
1161 | /** |
1162 | * bus_set_iommu - set iommu-callbacks for the bus | |
1163 | * @bus: bus. | |
1164 | * @ops: the callbacks provided by the iommu-driver | |
1165 | * | |
1166 | * This function is called by an iommu driver to set the iommu methods | |
1167 | * used for a particular bus. Drivers for devices on that bus can use | |
1168 | * the iommu-api after these ops are registered. | |
1169 | * This special function is needed because IOMMUs are usually devices on | |
1170 | * the bus itself, so the iommu drivers are not initialized when the bus | |
1171 | * is set up. With this function the iommu-driver can set the iommu-ops | |
1172 | * afterwards. | |
1173 | */ | |
b22f6434 | 1174 | int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops) |
fc2100eb | 1175 | { |
d7da6bdc HS |
1176 | int err; |
1177 | ||
ff21776d JR |
1178 | if (bus->iommu_ops != NULL) |
1179 | return -EBUSY; | |
fc2100eb | 1180 | |
ff21776d JR |
1181 | bus->iommu_ops = ops; |
1182 | ||
1183 | /* Do IOMMU specific setup for this bus-type */ | |
d7da6bdc HS |
1184 | err = iommu_bus_init(bus, ops); |
1185 | if (err) | |
1186 | bus->iommu_ops = NULL; | |
1187 | ||
1188 | return err; | |
fc2100eb | 1189 | } |
ff21776d | 1190 | EXPORT_SYMBOL_GPL(bus_set_iommu); |
fc2100eb | 1191 | |
a1b60c1c | 1192 | bool iommu_present(struct bus_type *bus) |
fc2100eb | 1193 | { |
94441c3b | 1194 | return bus->iommu_ops != NULL; |
fc2100eb | 1195 | } |
a1b60c1c | 1196 | EXPORT_SYMBOL_GPL(iommu_present); |
fc2100eb | 1197 | |
3c0e0ca0 JR |
1198 | bool iommu_capable(struct bus_type *bus, enum iommu_cap cap) |
1199 | { | |
1200 | if (!bus->iommu_ops || !bus->iommu_ops->capable) | |
1201 | return false; | |
1202 | ||
1203 | return bus->iommu_ops->capable(cap); | |
1204 | } | |
1205 | EXPORT_SYMBOL_GPL(iommu_capable); | |
1206 | ||
4f3f8d9d OBC |
1207 | /** |
1208 | * iommu_set_fault_handler() - set a fault handler for an iommu domain | |
1209 | * @domain: iommu domain | |
1210 | * @handler: fault handler | |
77ca2332 | 1211 | * @token: user data, will be passed back to the fault handler |
0ed6d2d2 OBC |
1212 | * |
1213 | * This function should be used by IOMMU users which want to be notified | |
1214 | * whenever an IOMMU fault happens. | |
1215 | * | |
1216 | * The fault handler itself should return 0 on success, and an appropriate | |
1217 | * error code otherwise. | |
4f3f8d9d OBC |
1218 | */ |
1219 | void iommu_set_fault_handler(struct iommu_domain *domain, | |
77ca2332 OBC |
1220 | iommu_fault_handler_t handler, |
1221 | void *token) | |
4f3f8d9d OBC |
1222 | { |
1223 | BUG_ON(!domain); | |
1224 | ||
1225 | domain->handler = handler; | |
77ca2332 | 1226 | domain->handler_token = token; |
4f3f8d9d | 1227 | } |
30bd918c | 1228 | EXPORT_SYMBOL_GPL(iommu_set_fault_handler); |
4f3f8d9d | 1229 | |
53723dc5 JR |
1230 | static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus, |
1231 | unsigned type) | |
fc2100eb JR |
1232 | { |
1233 | struct iommu_domain *domain; | |
fc2100eb | 1234 | |
94441c3b | 1235 | if (bus == NULL || bus->iommu_ops == NULL) |
905d66c1 JR |
1236 | return NULL; |
1237 | ||
53723dc5 | 1238 | domain = bus->iommu_ops->domain_alloc(type); |
fc2100eb JR |
1239 | if (!domain) |
1240 | return NULL; | |
1241 | ||
8539c7c1 | 1242 | domain->ops = bus->iommu_ops; |
53723dc5 | 1243 | domain->type = type; |
d16e0faa RM |
1244 | /* Assume all sizes by default; the driver may override this later */ |
1245 | domain->pgsize_bitmap = bus->iommu_ops->pgsize_bitmap; | |
905d66c1 | 1246 | |
fc2100eb | 1247 | return domain; |
fc2100eb | 1248 | } |
fc2100eb | 1249 | |
53723dc5 JR |
1250 | struct iommu_domain *iommu_domain_alloc(struct bus_type *bus) |
1251 | { | |
1252 | return __iommu_domain_alloc(bus, IOMMU_DOMAIN_UNMANAGED); | |
fc2100eb JR |
1253 | } |
1254 | EXPORT_SYMBOL_GPL(iommu_domain_alloc); | |
1255 | ||
1256 | void iommu_domain_free(struct iommu_domain *domain) | |
1257 | { | |
89be34a1 | 1258 | domain->ops->domain_free(domain); |
fc2100eb JR |
1259 | } |
1260 | EXPORT_SYMBOL_GPL(iommu_domain_free); | |
1261 | ||
426a2738 JR |
1262 | static int __iommu_attach_device(struct iommu_domain *domain, |
1263 | struct device *dev) | |
fc2100eb | 1264 | { |
b54db778 | 1265 | int ret; |
e5aa7f00 JR |
1266 | if (unlikely(domain->ops->attach_dev == NULL)) |
1267 | return -ENODEV; | |
1268 | ||
b54db778 SK |
1269 | ret = domain->ops->attach_dev(domain, dev); |
1270 | if (!ret) | |
1271 | trace_attach_device_to_domain(dev); | |
1272 | return ret; | |
fc2100eb | 1273 | } |
426a2738 JR |
1274 | |
1275 | int iommu_attach_device(struct iommu_domain *domain, struct device *dev) | |
1276 | { | |
1277 | struct iommu_group *group; | |
1278 | int ret; | |
1279 | ||
1280 | group = iommu_group_get(dev); | |
1281 | /* FIXME: Remove this when groups a mandatory for iommu drivers */ | |
1282 | if (group == NULL) | |
1283 | return __iommu_attach_device(domain, dev); | |
1284 | ||
1285 | /* | |
1286 | * We have a group - lock it to make sure the device-count doesn't | |
1287 | * change while we are attaching | |
1288 | */ | |
1289 | mutex_lock(&group->mutex); | |
1290 | ret = -EINVAL; | |
1291 | if (iommu_group_device_count(group) != 1) | |
1292 | goto out_unlock; | |
1293 | ||
e39cb8a3 | 1294 | ret = __iommu_attach_group(domain, group); |
426a2738 JR |
1295 | |
1296 | out_unlock: | |
1297 | mutex_unlock(&group->mutex); | |
1298 | iommu_group_put(group); | |
1299 | ||
1300 | return ret; | |
1301 | } | |
fc2100eb JR |
1302 | EXPORT_SYMBOL_GPL(iommu_attach_device); |
1303 | ||
426a2738 JR |
1304 | static void __iommu_detach_device(struct iommu_domain *domain, |
1305 | struct device *dev) | |
fc2100eb | 1306 | { |
e5aa7f00 JR |
1307 | if (unlikely(domain->ops->detach_dev == NULL)) |
1308 | return; | |
1309 | ||
1310 | domain->ops->detach_dev(domain, dev); | |
69980630 | 1311 | trace_detach_device_from_domain(dev); |
fc2100eb | 1312 | } |
426a2738 JR |
1313 | |
1314 | void iommu_detach_device(struct iommu_domain *domain, struct device *dev) | |
1315 | { | |
1316 | struct iommu_group *group; | |
1317 | ||
1318 | group = iommu_group_get(dev); | |
1319 | /* FIXME: Remove this when groups a mandatory for iommu drivers */ | |
1320 | if (group == NULL) | |
1321 | return __iommu_detach_device(domain, dev); | |
1322 | ||
1323 | mutex_lock(&group->mutex); | |
1324 | if (iommu_group_device_count(group) != 1) { | |
1325 | WARN_ON(1); | |
1326 | goto out_unlock; | |
1327 | } | |
1328 | ||
e39cb8a3 | 1329 | __iommu_detach_group(domain, group); |
426a2738 JR |
1330 | |
1331 | out_unlock: | |
1332 | mutex_unlock(&group->mutex); | |
1333 | iommu_group_put(group); | |
1334 | } | |
fc2100eb JR |
1335 | EXPORT_SYMBOL_GPL(iommu_detach_device); |
1336 | ||
2c1296d9 JR |
1337 | struct iommu_domain *iommu_get_domain_for_dev(struct device *dev) |
1338 | { | |
1339 | struct iommu_domain *domain; | |
1340 | struct iommu_group *group; | |
1341 | ||
1342 | group = iommu_group_get(dev); | |
1343 | /* FIXME: Remove this when groups a mandatory for iommu drivers */ | |
1344 | if (group == NULL) | |
1345 | return NULL; | |
1346 | ||
1347 | domain = group->domain; | |
1348 | ||
1349 | iommu_group_put(group); | |
1350 | ||
1351 | return domain; | |
1352 | } | |
1353 | EXPORT_SYMBOL_GPL(iommu_get_domain_for_dev); | |
fc2100eb | 1354 | |
d72e31c9 AW |
1355 | /* |
1356 | * IOMMU groups are really the natrual working unit of the IOMMU, but | |
1357 | * the IOMMU API works on domains and devices. Bridge that gap by | |
1358 | * iterating over the devices in a group. Ideally we'd have a single | |
1359 | * device which represents the requestor ID of the group, but we also | |
1360 | * allow IOMMU drivers to create policy defined minimum sets, where | |
1361 | * the physical hardware may be able to distiguish members, but we | |
1362 | * wish to group them at a higher level (ex. untrusted multi-function | |
1363 | * PCI devices). Thus we attach each device. | |
1364 | */ | |
1365 | static int iommu_group_do_attach_device(struct device *dev, void *data) | |
1366 | { | |
1367 | struct iommu_domain *domain = data; | |
1368 | ||
426a2738 | 1369 | return __iommu_attach_device(domain, dev); |
d72e31c9 AW |
1370 | } |
1371 | ||
e39cb8a3 JR |
1372 | static int __iommu_attach_group(struct iommu_domain *domain, |
1373 | struct iommu_group *group) | |
1374 | { | |
1375 | int ret; | |
1376 | ||
1377 | if (group->default_domain && group->domain != group->default_domain) | |
1378 | return -EBUSY; | |
1379 | ||
1380 | ret = __iommu_group_for_each_dev(group, domain, | |
1381 | iommu_group_do_attach_device); | |
1382 | if (ret == 0) | |
1383 | group->domain = domain; | |
1384 | ||
1385 | return ret; | |
d72e31c9 AW |
1386 | } |
1387 | ||
1388 | int iommu_attach_group(struct iommu_domain *domain, struct iommu_group *group) | |
1389 | { | |
e39cb8a3 JR |
1390 | int ret; |
1391 | ||
1392 | mutex_lock(&group->mutex); | |
1393 | ret = __iommu_attach_group(domain, group); | |
1394 | mutex_unlock(&group->mutex); | |
1395 | ||
1396 | return ret; | |
d72e31c9 AW |
1397 | } |
1398 | EXPORT_SYMBOL_GPL(iommu_attach_group); | |
1399 | ||
1400 | static int iommu_group_do_detach_device(struct device *dev, void *data) | |
1401 | { | |
1402 | struct iommu_domain *domain = data; | |
1403 | ||
426a2738 | 1404 | __iommu_detach_device(domain, dev); |
d72e31c9 AW |
1405 | |
1406 | return 0; | |
1407 | } | |
1408 | ||
e39cb8a3 JR |
1409 | static void __iommu_detach_group(struct iommu_domain *domain, |
1410 | struct iommu_group *group) | |
1411 | { | |
1412 | int ret; | |
1413 | ||
1414 | if (!group->default_domain) { | |
1415 | __iommu_group_for_each_dev(group, domain, | |
1416 | iommu_group_do_detach_device); | |
1417 | group->domain = NULL; | |
1418 | return; | |
1419 | } | |
1420 | ||
1421 | if (group->domain == group->default_domain) | |
1422 | return; | |
1423 | ||
1424 | /* Detach by re-attaching to the default domain */ | |
1425 | ret = __iommu_group_for_each_dev(group, group->default_domain, | |
1426 | iommu_group_do_attach_device); | |
1427 | if (ret != 0) | |
1428 | WARN_ON(1); | |
1429 | else | |
1430 | group->domain = group->default_domain; | |
1431 | } | |
1432 | ||
d72e31c9 AW |
1433 | void iommu_detach_group(struct iommu_domain *domain, struct iommu_group *group) |
1434 | { | |
e39cb8a3 JR |
1435 | mutex_lock(&group->mutex); |
1436 | __iommu_detach_group(domain, group); | |
1437 | mutex_unlock(&group->mutex); | |
d72e31c9 AW |
1438 | } |
1439 | EXPORT_SYMBOL_GPL(iommu_detach_group); | |
1440 | ||
bb5547ac | 1441 | phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova) |
fc2100eb | 1442 | { |
e5aa7f00 JR |
1443 | if (unlikely(domain->ops->iova_to_phys == NULL)) |
1444 | return 0; | |
1445 | ||
1446 | return domain->ops->iova_to_phys(domain, iova); | |
fc2100eb JR |
1447 | } |
1448 | EXPORT_SYMBOL_GPL(iommu_iova_to_phys); | |
dbb9fd86 | 1449 | |
bd13969b AW |
1450 | static size_t iommu_pgsize(struct iommu_domain *domain, |
1451 | unsigned long addr_merge, size_t size) | |
1452 | { | |
1453 | unsigned int pgsize_idx; | |
1454 | size_t pgsize; | |
1455 | ||
1456 | /* Max page size that still fits into 'size' */ | |
1457 | pgsize_idx = __fls(size); | |
1458 | ||
1459 | /* need to consider alignment requirements ? */ | |
1460 | if (likely(addr_merge)) { | |
1461 | /* Max page size allowed by address */ | |
1462 | unsigned int align_pgsize_idx = __ffs(addr_merge); | |
1463 | pgsize_idx = min(pgsize_idx, align_pgsize_idx); | |
1464 | } | |
1465 | ||
1466 | /* build a mask of acceptable page sizes */ | |
1467 | pgsize = (1UL << (pgsize_idx + 1)) - 1; | |
1468 | ||
1469 | /* throw away page sizes not supported by the hardware */ | |
d16e0faa | 1470 | pgsize &= domain->pgsize_bitmap; |
bd13969b AW |
1471 | |
1472 | /* make sure we're still sane */ | |
1473 | BUG_ON(!pgsize); | |
1474 | ||
1475 | /* pick the biggest page */ | |
1476 | pgsize_idx = __fls(pgsize); | |
1477 | pgsize = 1UL << pgsize_idx; | |
1478 | ||
1479 | return pgsize; | |
1480 | } | |
1481 | ||
cefc53c7 | 1482 | int iommu_map(struct iommu_domain *domain, unsigned long iova, |
7d3002cc | 1483 | phys_addr_t paddr, size_t size, int prot) |
cefc53c7 | 1484 | { |
7d3002cc OBC |
1485 | unsigned long orig_iova = iova; |
1486 | unsigned int min_pagesz; | |
1487 | size_t orig_size = size; | |
06bfcaa9 | 1488 | phys_addr_t orig_paddr = paddr; |
7d3002cc | 1489 | int ret = 0; |
cefc53c7 | 1490 | |
9db4ad91 | 1491 | if (unlikely(domain->ops->map == NULL || |
d16e0faa | 1492 | domain->pgsize_bitmap == 0UL)) |
e5aa7f00 | 1493 | return -ENODEV; |
cefc53c7 | 1494 | |
a10315e5 JR |
1495 | if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING))) |
1496 | return -EINVAL; | |
1497 | ||
7d3002cc | 1498 | /* find out the minimum page size supported */ |
d16e0faa | 1499 | min_pagesz = 1 << __ffs(domain->pgsize_bitmap); |
7d3002cc OBC |
1500 | |
1501 | /* | |
1502 | * both the virtual address and the physical one, as well as | |
1503 | * the size of the mapping, must be aligned (at least) to the | |
1504 | * size of the smallest page supported by the hardware | |
1505 | */ | |
1506 | if (!IS_ALIGNED(iova | paddr | size, min_pagesz)) { | |
abedb049 | 1507 | pr_err("unaligned: iova 0x%lx pa %pa size 0x%zx min_pagesz 0x%x\n", |
6197ca82 | 1508 | iova, &paddr, size, min_pagesz); |
7d3002cc OBC |
1509 | return -EINVAL; |
1510 | } | |
1511 | ||
abedb049 | 1512 | pr_debug("map: iova 0x%lx pa %pa size 0x%zx\n", iova, &paddr, size); |
7d3002cc OBC |
1513 | |
1514 | while (size) { | |
bd13969b | 1515 | size_t pgsize = iommu_pgsize(domain, iova | paddr, size); |
7d3002cc | 1516 | |
abedb049 | 1517 | pr_debug("mapping: iova 0x%lx pa %pa pgsize 0x%zx\n", |
6197ca82 | 1518 | iova, &paddr, pgsize); |
7d3002cc OBC |
1519 | |
1520 | ret = domain->ops->map(domain, iova, paddr, pgsize, prot); | |
1521 | if (ret) | |
1522 | break; | |
1523 | ||
1524 | iova += pgsize; | |
1525 | paddr += pgsize; | |
1526 | size -= pgsize; | |
1527 | } | |
1528 | ||
1529 | /* unroll mapping in case something went wrong */ | |
1530 | if (ret) | |
1531 | iommu_unmap(domain, orig_iova, orig_size - size); | |
e0be7c86 | 1532 | else |
06bfcaa9 | 1533 | trace_map(orig_iova, orig_paddr, orig_size); |
7d3002cc OBC |
1534 | |
1535 | return ret; | |
cefc53c7 JR |
1536 | } |
1537 | EXPORT_SYMBOL_GPL(iommu_map); | |
1538 | ||
7d3002cc | 1539 | size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova, size_t size) |
cefc53c7 | 1540 | { |
7d3002cc OBC |
1541 | size_t unmapped_page, unmapped = 0; |
1542 | unsigned int min_pagesz; | |
6fd492fd | 1543 | unsigned long orig_iova = iova; |
cefc53c7 | 1544 | |
57886518 | 1545 | if (unlikely(domain->ops->unmap == NULL || |
d16e0faa | 1546 | domain->pgsize_bitmap == 0UL)) |
e5aa7f00 JR |
1547 | return -ENODEV; |
1548 | ||
a10315e5 JR |
1549 | if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING))) |
1550 | return -EINVAL; | |
1551 | ||
7d3002cc | 1552 | /* find out the minimum page size supported */ |
d16e0faa | 1553 | min_pagesz = 1 << __ffs(domain->pgsize_bitmap); |
7d3002cc OBC |
1554 | |
1555 | /* | |
1556 | * The virtual address, as well as the size of the mapping, must be | |
1557 | * aligned (at least) to the size of the smallest page supported | |
1558 | * by the hardware | |
1559 | */ | |
1560 | if (!IS_ALIGNED(iova | size, min_pagesz)) { | |
6197ca82 JP |
1561 | pr_err("unaligned: iova 0x%lx size 0x%zx min_pagesz 0x%x\n", |
1562 | iova, size, min_pagesz); | |
7d3002cc OBC |
1563 | return -EINVAL; |
1564 | } | |
1565 | ||
6197ca82 | 1566 | pr_debug("unmap this: iova 0x%lx size 0x%zx\n", iova, size); |
7d3002cc OBC |
1567 | |
1568 | /* | |
1569 | * Keep iterating until we either unmap 'size' bytes (or more) | |
1570 | * or we hit an area that isn't mapped. | |
1571 | */ | |
1572 | while (unmapped < size) { | |
bd13969b | 1573 | size_t pgsize = iommu_pgsize(domain, iova, size - unmapped); |
7d3002cc | 1574 | |
bd13969b | 1575 | unmapped_page = domain->ops->unmap(domain, iova, pgsize); |
7d3002cc OBC |
1576 | if (!unmapped_page) |
1577 | break; | |
1578 | ||
6197ca82 JP |
1579 | pr_debug("unmapped: iova 0x%lx size 0x%zx\n", |
1580 | iova, unmapped_page); | |
7d3002cc OBC |
1581 | |
1582 | iova += unmapped_page; | |
1583 | unmapped += unmapped_page; | |
1584 | } | |
1585 | ||
db8614d3 | 1586 | trace_unmap(orig_iova, size, unmapped); |
7d3002cc | 1587 | return unmapped; |
cefc53c7 JR |
1588 | } |
1589 | EXPORT_SYMBOL_GPL(iommu_unmap); | |
1460432c | 1590 | |
315786eb OH |
1591 | size_t default_iommu_map_sg(struct iommu_domain *domain, unsigned long iova, |
1592 | struct scatterlist *sg, unsigned int nents, int prot) | |
1593 | { | |
38ec010d | 1594 | struct scatterlist *s; |
315786eb | 1595 | size_t mapped = 0; |
18f23409 | 1596 | unsigned int i, min_pagesz; |
38ec010d | 1597 | int ret; |
315786eb | 1598 | |
d16e0faa | 1599 | if (unlikely(domain->pgsize_bitmap == 0UL)) |
18f23409 | 1600 | return 0; |
315786eb | 1601 | |
d16e0faa | 1602 | min_pagesz = 1 << __ffs(domain->pgsize_bitmap); |
18f23409 RM |
1603 | |
1604 | for_each_sg(sg, s, nents, i) { | |
3e6110fd | 1605 | phys_addr_t phys = page_to_phys(sg_page(s)) + s->offset; |
18f23409 RM |
1606 | |
1607 | /* | |
1608 | * We are mapping on IOMMU page boundaries, so offset within | |
1609 | * the page must be 0. However, the IOMMU may support pages | |
1610 | * smaller than PAGE_SIZE, so s->offset may still represent | |
1611 | * an offset of that boundary within the CPU page. | |
1612 | */ | |
1613 | if (!IS_ALIGNED(s->offset, min_pagesz)) | |
38ec010d JR |
1614 | goto out_err; |
1615 | ||
1616 | ret = iommu_map(domain, iova + mapped, phys, s->length, prot); | |
1617 | if (ret) | |
1618 | goto out_err; | |
1619 | ||
1620 | mapped += s->length; | |
315786eb OH |
1621 | } |
1622 | ||
1623 | return mapped; | |
38ec010d JR |
1624 | |
1625 | out_err: | |
1626 | /* undo mappings already done */ | |
1627 | iommu_unmap(domain, iova, mapped); | |
1628 | ||
1629 | return 0; | |
1630 | ||
315786eb OH |
1631 | } |
1632 | EXPORT_SYMBOL_GPL(default_iommu_map_sg); | |
d7787d57 JR |
1633 | |
1634 | int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr, | |
80f97f0f | 1635 | phys_addr_t paddr, u64 size, int prot) |
d7787d57 JR |
1636 | { |
1637 | if (unlikely(domain->ops->domain_window_enable == NULL)) | |
1638 | return -ENODEV; | |
1639 | ||
80f97f0f VS |
1640 | return domain->ops->domain_window_enable(domain, wnd_nr, paddr, size, |
1641 | prot); | |
d7787d57 JR |
1642 | } |
1643 | EXPORT_SYMBOL_GPL(iommu_domain_window_enable); | |
1644 | ||
1645 | void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr) | |
1646 | { | |
1647 | if (unlikely(domain->ops->domain_window_disable == NULL)) | |
1648 | return; | |
1649 | ||
1650 | return domain->ops->domain_window_disable(domain, wnd_nr); | |
1651 | } | |
1652 | EXPORT_SYMBOL_GPL(iommu_domain_window_disable); | |
1653 | ||
d72e31c9 | 1654 | static int __init iommu_init(void) |
1460432c | 1655 | { |
d72e31c9 AW |
1656 | iommu_group_kset = kset_create_and_add("iommu_groups", |
1657 | NULL, kernel_kobj); | |
d72e31c9 AW |
1658 | BUG_ON(!iommu_group_kset); |
1659 | ||
1660 | return 0; | |
1460432c | 1661 | } |
d7ef9995 | 1662 | core_initcall(iommu_init); |
0cd76dd1 JR |
1663 | |
1664 | int iommu_domain_get_attr(struct iommu_domain *domain, | |
1665 | enum iommu_attr attr, void *data) | |
1666 | { | |
0ff64f80 | 1667 | struct iommu_domain_geometry *geometry; |
d2e12160 | 1668 | bool *paging; |
0ff64f80 | 1669 | int ret = 0; |
69356712 | 1670 | u32 *count; |
0ff64f80 JR |
1671 | |
1672 | switch (attr) { | |
1673 | case DOMAIN_ATTR_GEOMETRY: | |
1674 | geometry = data; | |
1675 | *geometry = domain->geometry; | |
1676 | ||
d2e12160 JR |
1677 | break; |
1678 | case DOMAIN_ATTR_PAGING: | |
1679 | paging = data; | |
d16e0faa | 1680 | *paging = (domain->pgsize_bitmap != 0UL); |
69356712 JR |
1681 | break; |
1682 | case DOMAIN_ATTR_WINDOWS: | |
1683 | count = data; | |
1684 | ||
1685 | if (domain->ops->domain_get_windows != NULL) | |
1686 | *count = domain->ops->domain_get_windows(domain); | |
1687 | else | |
1688 | ret = -ENODEV; | |
1689 | ||
0ff64f80 JR |
1690 | break; |
1691 | default: | |
1692 | if (!domain->ops->domain_get_attr) | |
1693 | return -EINVAL; | |
0cd76dd1 | 1694 | |
0ff64f80 JR |
1695 | ret = domain->ops->domain_get_attr(domain, attr, data); |
1696 | } | |
1697 | ||
1698 | return ret; | |
0cd76dd1 JR |
1699 | } |
1700 | EXPORT_SYMBOL_GPL(iommu_domain_get_attr); | |
1701 | ||
1702 | int iommu_domain_set_attr(struct iommu_domain *domain, | |
1703 | enum iommu_attr attr, void *data) | |
1704 | { | |
69356712 JR |
1705 | int ret = 0; |
1706 | u32 *count; | |
1707 | ||
1708 | switch (attr) { | |
1709 | case DOMAIN_ATTR_WINDOWS: | |
1710 | count = data; | |
1711 | ||
1712 | if (domain->ops->domain_set_windows != NULL) | |
1713 | ret = domain->ops->domain_set_windows(domain, *count); | |
1714 | else | |
1715 | ret = -ENODEV; | |
1460432c | 1716 | |
69356712 JR |
1717 | break; |
1718 | default: | |
1719 | if (domain->ops->domain_set_attr == NULL) | |
1720 | return -EINVAL; | |
1721 | ||
1722 | ret = domain->ops->domain_set_attr(domain, attr, data); | |
1723 | } | |
1724 | ||
1725 | return ret; | |
1460432c | 1726 | } |
0cd76dd1 | 1727 | EXPORT_SYMBOL_GPL(iommu_domain_set_attr); |
a1015c2b | 1728 | |
e5b5234a | 1729 | void iommu_get_resv_regions(struct device *dev, struct list_head *list) |
a1015c2b JR |
1730 | { |
1731 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
1732 | ||
e5b5234a EA |
1733 | if (ops && ops->get_resv_regions) |
1734 | ops->get_resv_regions(dev, list); | |
a1015c2b JR |
1735 | } |
1736 | ||
e5b5234a | 1737 | void iommu_put_resv_regions(struct device *dev, struct list_head *list) |
a1015c2b JR |
1738 | { |
1739 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
1740 | ||
e5b5234a EA |
1741 | if (ops && ops->put_resv_regions) |
1742 | ops->put_resv_regions(dev, list); | |
a1015c2b | 1743 | } |
d290f1e7 | 1744 | |
2b20cbba EA |
1745 | struct iommu_resv_region *iommu_alloc_resv_region(phys_addr_t start, |
1746 | size_t length, | |
1747 | int prot, int type) | |
1748 | { | |
1749 | struct iommu_resv_region *region; | |
1750 | ||
1751 | region = kzalloc(sizeof(*region), GFP_KERNEL); | |
1752 | if (!region) | |
1753 | return NULL; | |
1754 | ||
1755 | INIT_LIST_HEAD(®ion->list); | |
1756 | region->start = start; | |
1757 | region->length = length; | |
1758 | region->prot = prot; | |
1759 | region->type = type; | |
1760 | return region; | |
a1015c2b | 1761 | } |
d290f1e7 JR |
1762 | |
1763 | /* Request that a device is direct mapped by the IOMMU */ | |
1764 | int iommu_request_dm_for_dev(struct device *dev) | |
1765 | { | |
1766 | struct iommu_domain *dm_domain; | |
1767 | struct iommu_group *group; | |
1768 | int ret; | |
1769 | ||
1770 | /* Device must already be in a group before calling this function */ | |
1771 | group = iommu_group_get_for_dev(dev); | |
409e553d DC |
1772 | if (IS_ERR(group)) |
1773 | return PTR_ERR(group); | |
d290f1e7 JR |
1774 | |
1775 | mutex_lock(&group->mutex); | |
1776 | ||
1777 | /* Check if the default domain is already direct mapped */ | |
1778 | ret = 0; | |
1779 | if (group->default_domain && | |
1780 | group->default_domain->type == IOMMU_DOMAIN_IDENTITY) | |
1781 | goto out; | |
1782 | ||
1783 | /* Don't change mappings of existing devices */ | |
1784 | ret = -EBUSY; | |
1785 | if (iommu_group_device_count(group) != 1) | |
1786 | goto out; | |
1787 | ||
1788 | /* Allocate a direct mapped domain */ | |
1789 | ret = -ENOMEM; | |
1790 | dm_domain = __iommu_domain_alloc(dev->bus, IOMMU_DOMAIN_IDENTITY); | |
1791 | if (!dm_domain) | |
1792 | goto out; | |
1793 | ||
1794 | /* Attach the device to the domain */ | |
1795 | ret = __iommu_attach_group(dm_domain, group); | |
1796 | if (ret) { | |
1797 | iommu_domain_free(dm_domain); | |
1798 | goto out; | |
1799 | } | |
1800 | ||
1801 | /* Make the direct mapped domain the default for this group */ | |
1802 | if (group->default_domain) | |
1803 | iommu_domain_free(group->default_domain); | |
1804 | group->default_domain = dm_domain; | |
1805 | ||
1806 | pr_info("Using direct mapping for device %s\n", dev_name(dev)); | |
1807 | ||
1808 | ret = 0; | |
1809 | out: | |
1810 | mutex_unlock(&group->mutex); | |
1811 | iommu_group_put(group); | |
1812 | ||
1813 | return ret; | |
1814 | } | |
57f98d2f | 1815 | |
534766df | 1816 | const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode) |
e4f10ffe | 1817 | { |
e4f10ffe | 1818 | const struct iommu_ops *ops = NULL; |
d0f6f583 | 1819 | struct iommu_device *iommu; |
e4f10ffe | 1820 | |
d0f6f583 JR |
1821 | spin_lock(&iommu_device_lock); |
1822 | list_for_each_entry(iommu, &iommu_device_list, list) | |
1823 | if (iommu->fwnode == fwnode) { | |
1824 | ops = iommu->ops; | |
e4f10ffe LP |
1825 | break; |
1826 | } | |
d0f6f583 | 1827 | spin_unlock(&iommu_device_lock); |
e4f10ffe LP |
1828 | return ops; |
1829 | } | |
1830 | ||
57f98d2f RM |
1831 | int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode, |
1832 | const struct iommu_ops *ops) | |
1833 | { | |
1834 | struct iommu_fwspec *fwspec = dev->iommu_fwspec; | |
1835 | ||
1836 | if (fwspec) | |
1837 | return ops == fwspec->ops ? 0 : -EINVAL; | |
1838 | ||
1839 | fwspec = kzalloc(sizeof(*fwspec), GFP_KERNEL); | |
1840 | if (!fwspec) | |
1841 | return -ENOMEM; | |
1842 | ||
1843 | of_node_get(to_of_node(iommu_fwnode)); | |
1844 | fwspec->iommu_fwnode = iommu_fwnode; | |
1845 | fwspec->ops = ops; | |
1846 | dev->iommu_fwspec = fwspec; | |
1847 | return 0; | |
1848 | } | |
1849 | EXPORT_SYMBOL_GPL(iommu_fwspec_init); | |
1850 | ||
1851 | void iommu_fwspec_free(struct device *dev) | |
1852 | { | |
1853 | struct iommu_fwspec *fwspec = dev->iommu_fwspec; | |
1854 | ||
1855 | if (fwspec) { | |
1856 | fwnode_handle_put(fwspec->iommu_fwnode); | |
1857 | kfree(fwspec); | |
1858 | dev->iommu_fwspec = NULL; | |
1859 | } | |
1860 | } | |
1861 | EXPORT_SYMBOL_GPL(iommu_fwspec_free); | |
1862 | ||
1863 | int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids) | |
1864 | { | |
1865 | struct iommu_fwspec *fwspec = dev->iommu_fwspec; | |
1866 | size_t size; | |
1867 | int i; | |
1868 | ||
1869 | if (!fwspec) | |
1870 | return -EINVAL; | |
1871 | ||
1872 | size = offsetof(struct iommu_fwspec, ids[fwspec->num_ids + num_ids]); | |
1873 | if (size > sizeof(*fwspec)) { | |
1874 | fwspec = krealloc(dev->iommu_fwspec, size, GFP_KERNEL); | |
1875 | if (!fwspec) | |
1876 | return -ENOMEM; | |
909111ba ZL |
1877 | |
1878 | dev->iommu_fwspec = fwspec; | |
57f98d2f RM |
1879 | } |
1880 | ||
1881 | for (i = 0; i < num_ids; i++) | |
1882 | fwspec->ids[fwspec->num_ids + i] = ids[i]; | |
1883 | ||
1884 | fwspec->num_ids += num_ids; | |
57f98d2f RM |
1885 | return 0; |
1886 | } | |
1887 | EXPORT_SYMBOL_GPL(iommu_fwspec_add_ids); |