]>
Commit | Line | Data |
---|---|---|
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); |
fccb4e3b | 39 | static unsigned int iommu_def_domain_type = IOMMU_DOMAIN_DMA; |
d72e31c9 | 40 | |
b22f6434 TR |
41 | struct iommu_callback_data { |
42 | const struct iommu_ops *ops; | |
43 | }; | |
44 | ||
d72e31c9 AW |
45 | struct iommu_group { |
46 | struct kobject kobj; | |
47 | struct kobject *devices_kobj; | |
48 | struct list_head devices; | |
49 | struct mutex mutex; | |
50 | struct blocking_notifier_head notifier; | |
51 | void *iommu_data; | |
52 | void (*iommu_data_release)(void *iommu_data); | |
53 | char *name; | |
54 | int id; | |
53723dc5 | 55 | struct iommu_domain *default_domain; |
e39cb8a3 | 56 | struct iommu_domain *domain; |
d72e31c9 AW |
57 | }; |
58 | ||
c09e22d5 | 59 | struct group_device { |
d72e31c9 AW |
60 | struct list_head list; |
61 | struct device *dev; | |
62 | char *name; | |
63 | }; | |
64 | ||
65 | struct iommu_group_attribute { | |
66 | struct attribute attr; | |
67 | ssize_t (*show)(struct iommu_group *group, char *buf); | |
68 | ssize_t (*store)(struct iommu_group *group, | |
69 | const char *buf, size_t count); | |
70 | }; | |
71 | ||
bc7d12b9 EA |
72 | static const char * const iommu_group_resv_type_string[] = { |
73 | [IOMMU_RESV_DIRECT] = "direct", | |
74 | [IOMMU_RESV_RESERVED] = "reserved", | |
75 | [IOMMU_RESV_MSI] = "msi", | |
9d3a4de4 | 76 | [IOMMU_RESV_SW_MSI] = "msi", |
bc7d12b9 EA |
77 | }; |
78 | ||
d72e31c9 AW |
79 | #define IOMMU_GROUP_ATTR(_name, _mode, _show, _store) \ |
80 | struct iommu_group_attribute iommu_group_attr_##_name = \ | |
81 | __ATTR(_name, _mode, _show, _store) | |
fc2100eb | 82 | |
d72e31c9 AW |
83 | #define to_iommu_group_attr(_attr) \ |
84 | container_of(_attr, struct iommu_group_attribute, attr) | |
85 | #define to_iommu_group(_kobj) \ | |
86 | container_of(_kobj, struct iommu_group, kobj) | |
fc2100eb | 87 | |
b0119e87 JR |
88 | static LIST_HEAD(iommu_device_list); |
89 | static DEFINE_SPINLOCK(iommu_device_lock); | |
90 | ||
91 | int iommu_device_register(struct iommu_device *iommu) | |
92 | { | |
93 | spin_lock(&iommu_device_lock); | |
94 | list_add_tail(&iommu->list, &iommu_device_list); | |
95 | spin_unlock(&iommu_device_lock); | |
96 | ||
97 | return 0; | |
98 | } | |
99 | ||
100 | void iommu_device_unregister(struct iommu_device *iommu) | |
101 | { | |
102 | spin_lock(&iommu_device_lock); | |
103 | list_del(&iommu->list); | |
104 | spin_unlock(&iommu_device_lock); | |
105 | } | |
106 | ||
53723dc5 JR |
107 | static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus, |
108 | unsigned type); | |
e39cb8a3 JR |
109 | static int __iommu_attach_device(struct iommu_domain *domain, |
110 | struct device *dev); | |
111 | static int __iommu_attach_group(struct iommu_domain *domain, | |
112 | struct iommu_group *group); | |
113 | static void __iommu_detach_group(struct iommu_domain *domain, | |
114 | struct iommu_group *group); | |
53723dc5 | 115 | |
fccb4e3b WD |
116 | static int __init iommu_set_def_domain_type(char *str) |
117 | { | |
118 | bool pt; | |
119 | ||
120 | if (!str || strtobool(str, &pt)) | |
121 | return -EINVAL; | |
122 | ||
123 | iommu_def_domain_type = pt ? IOMMU_DOMAIN_IDENTITY : IOMMU_DOMAIN_DMA; | |
124 | return 0; | |
125 | } | |
126 | early_param("iommu.passthrough", iommu_set_def_domain_type); | |
127 | ||
d72e31c9 AW |
128 | static ssize_t iommu_group_attr_show(struct kobject *kobj, |
129 | struct attribute *__attr, char *buf) | |
1460432c | 130 | { |
d72e31c9 AW |
131 | struct iommu_group_attribute *attr = to_iommu_group_attr(__attr); |
132 | struct iommu_group *group = to_iommu_group(kobj); | |
133 | ssize_t ret = -EIO; | |
1460432c | 134 | |
d72e31c9 AW |
135 | if (attr->show) |
136 | ret = attr->show(group, buf); | |
137 | return ret; | |
138 | } | |
139 | ||
140 | static ssize_t iommu_group_attr_store(struct kobject *kobj, | |
141 | struct attribute *__attr, | |
142 | const char *buf, size_t count) | |
143 | { | |
144 | struct iommu_group_attribute *attr = to_iommu_group_attr(__attr); | |
145 | struct iommu_group *group = to_iommu_group(kobj); | |
146 | ssize_t ret = -EIO; | |
1460432c | 147 | |
d72e31c9 AW |
148 | if (attr->store) |
149 | ret = attr->store(group, buf, count); | |
150 | return ret; | |
1460432c | 151 | } |
1460432c | 152 | |
d72e31c9 AW |
153 | static const struct sysfs_ops iommu_group_sysfs_ops = { |
154 | .show = iommu_group_attr_show, | |
155 | .store = iommu_group_attr_store, | |
156 | }; | |
1460432c | 157 | |
d72e31c9 AW |
158 | static int iommu_group_create_file(struct iommu_group *group, |
159 | struct iommu_group_attribute *attr) | |
160 | { | |
161 | return sysfs_create_file(&group->kobj, &attr->attr); | |
1460432c | 162 | } |
1460432c | 163 | |
d72e31c9 AW |
164 | static void iommu_group_remove_file(struct iommu_group *group, |
165 | struct iommu_group_attribute *attr) | |
166 | { | |
167 | sysfs_remove_file(&group->kobj, &attr->attr); | |
168 | } | |
169 | ||
170 | static ssize_t iommu_group_show_name(struct iommu_group *group, char *buf) | |
171 | { | |
172 | return sprintf(buf, "%s\n", group->name); | |
173 | } | |
174 | ||
6c65fb31 EA |
175 | /** |
176 | * iommu_insert_resv_region - Insert a new region in the | |
177 | * list of reserved regions. | |
178 | * @new: new region to insert | |
179 | * @regions: list of regions | |
180 | * | |
181 | * The new element is sorted by address with respect to the other | |
182 | * regions of the same type. In case it overlaps with another | |
183 | * region of the same type, regions are merged. In case it | |
184 | * overlaps with another region of different type, regions are | |
185 | * not merged. | |
186 | */ | |
187 | static int iommu_insert_resv_region(struct iommu_resv_region *new, | |
188 | struct list_head *regions) | |
189 | { | |
190 | struct iommu_resv_region *region; | |
191 | phys_addr_t start = new->start; | |
192 | phys_addr_t end = new->start + new->length - 1; | |
193 | struct list_head *pos = regions->next; | |
194 | ||
195 | while (pos != regions) { | |
196 | struct iommu_resv_region *entry = | |
197 | list_entry(pos, struct iommu_resv_region, list); | |
198 | phys_addr_t a = entry->start; | |
199 | phys_addr_t b = entry->start + entry->length - 1; | |
200 | int type = entry->type; | |
201 | ||
202 | if (end < a) { | |
203 | goto insert; | |
204 | } else if (start > b) { | |
205 | pos = pos->next; | |
206 | } else if ((start >= a) && (end <= b)) { | |
207 | if (new->type == type) | |
208 | goto done; | |
209 | else | |
210 | pos = pos->next; | |
211 | } else { | |
212 | if (new->type == type) { | |
213 | phys_addr_t new_start = min(a, start); | |
214 | phys_addr_t new_end = max(b, end); | |
215 | ||
216 | list_del(&entry->list); | |
217 | entry->start = new_start; | |
218 | entry->length = new_end - new_start + 1; | |
219 | iommu_insert_resv_region(entry, regions); | |
220 | } else { | |
221 | pos = pos->next; | |
222 | } | |
223 | } | |
224 | } | |
225 | insert: | |
226 | region = iommu_alloc_resv_region(new->start, new->length, | |
227 | new->prot, new->type); | |
228 | if (!region) | |
229 | return -ENOMEM; | |
230 | ||
231 | list_add_tail(®ion->list, pos); | |
232 | done: | |
233 | return 0; | |
234 | } | |
235 | ||
236 | static int | |
237 | iommu_insert_device_resv_regions(struct list_head *dev_resv_regions, | |
238 | struct list_head *group_resv_regions) | |
239 | { | |
240 | struct iommu_resv_region *entry; | |
a514a6e2 | 241 | int ret = 0; |
6c65fb31 EA |
242 | |
243 | list_for_each_entry(entry, dev_resv_regions, list) { | |
244 | ret = iommu_insert_resv_region(entry, group_resv_regions); | |
245 | if (ret) | |
246 | break; | |
247 | } | |
248 | return ret; | |
249 | } | |
250 | ||
251 | int iommu_get_group_resv_regions(struct iommu_group *group, | |
252 | struct list_head *head) | |
253 | { | |
8d2932dd | 254 | struct group_device *device; |
6c65fb31 EA |
255 | int ret = 0; |
256 | ||
257 | mutex_lock(&group->mutex); | |
258 | list_for_each_entry(device, &group->devices, list) { | |
259 | struct list_head dev_resv_regions; | |
260 | ||
261 | INIT_LIST_HEAD(&dev_resv_regions); | |
262 | iommu_get_resv_regions(device->dev, &dev_resv_regions); | |
263 | ret = iommu_insert_device_resv_regions(&dev_resv_regions, head); | |
264 | iommu_put_resv_regions(device->dev, &dev_resv_regions); | |
265 | if (ret) | |
266 | break; | |
267 | } | |
268 | mutex_unlock(&group->mutex); | |
269 | return ret; | |
270 | } | |
271 | EXPORT_SYMBOL_GPL(iommu_get_group_resv_regions); | |
272 | ||
bc7d12b9 EA |
273 | static ssize_t iommu_group_show_resv_regions(struct iommu_group *group, |
274 | char *buf) | |
275 | { | |
276 | struct iommu_resv_region *region, *next; | |
277 | struct list_head group_resv_regions; | |
278 | char *str = buf; | |
279 | ||
280 | INIT_LIST_HEAD(&group_resv_regions); | |
281 | iommu_get_group_resv_regions(group, &group_resv_regions); | |
282 | ||
283 | list_for_each_entry_safe(region, next, &group_resv_regions, list) { | |
284 | str += sprintf(str, "0x%016llx 0x%016llx %s\n", | |
285 | (long long int)region->start, | |
286 | (long long int)(region->start + | |
287 | region->length - 1), | |
288 | iommu_group_resv_type_string[region->type]); | |
289 | kfree(region); | |
290 | } | |
291 | ||
292 | return (str - buf); | |
293 | } | |
294 | ||
d72e31c9 AW |
295 | static IOMMU_GROUP_ATTR(name, S_IRUGO, iommu_group_show_name, NULL); |
296 | ||
bc7d12b9 EA |
297 | static IOMMU_GROUP_ATTR(reserved_regions, 0444, |
298 | iommu_group_show_resv_regions, NULL); | |
299 | ||
d72e31c9 AW |
300 | static void iommu_group_release(struct kobject *kobj) |
301 | { | |
302 | struct iommu_group *group = to_iommu_group(kobj); | |
303 | ||
269aa808 JR |
304 | pr_debug("Releasing group %d\n", group->id); |
305 | ||
d72e31c9 AW |
306 | if (group->iommu_data_release) |
307 | group->iommu_data_release(group->iommu_data); | |
308 | ||
feccf398 | 309 | ida_simple_remove(&iommu_group_ida, group->id); |
d72e31c9 | 310 | |
53723dc5 JR |
311 | if (group->default_domain) |
312 | iommu_domain_free(group->default_domain); | |
313 | ||
d72e31c9 AW |
314 | kfree(group->name); |
315 | kfree(group); | |
316 | } | |
317 | ||
318 | static struct kobj_type iommu_group_ktype = { | |
319 | .sysfs_ops = &iommu_group_sysfs_ops, | |
320 | .release = iommu_group_release, | |
321 | }; | |
322 | ||
323 | /** | |
324 | * iommu_group_alloc - Allocate a new group | |
325 | * @name: Optional name to associate with group, visible in sysfs | |
326 | * | |
327 | * This function is called by an iommu driver to allocate a new iommu | |
328 | * group. The iommu group represents the minimum granularity of the iommu. | |
329 | * Upon successful return, the caller holds a reference to the supplied | |
330 | * group in order to hold the group until devices are added. Use | |
331 | * iommu_group_put() to release this extra reference count, allowing the | |
332 | * group to be automatically reclaimed once it has no devices or external | |
333 | * references. | |
334 | */ | |
335 | struct iommu_group *iommu_group_alloc(void) | |
1460432c | 336 | { |
d72e31c9 AW |
337 | struct iommu_group *group; |
338 | int ret; | |
339 | ||
340 | group = kzalloc(sizeof(*group), GFP_KERNEL); | |
341 | if (!group) | |
342 | return ERR_PTR(-ENOMEM); | |
343 | ||
344 | group->kobj.kset = iommu_group_kset; | |
345 | mutex_init(&group->mutex); | |
346 | INIT_LIST_HEAD(&group->devices); | |
347 | BLOCKING_INIT_NOTIFIER_HEAD(&group->notifier); | |
348 | ||
feccf398 HK |
349 | ret = ida_simple_get(&iommu_group_ida, 0, 0, GFP_KERNEL); |
350 | if (ret < 0) { | |
d72e31c9 | 351 | kfree(group); |
feccf398 | 352 | return ERR_PTR(ret); |
d72e31c9 | 353 | } |
feccf398 | 354 | group->id = ret; |
1460432c | 355 | |
d72e31c9 AW |
356 | ret = kobject_init_and_add(&group->kobj, &iommu_group_ktype, |
357 | NULL, "%d", group->id); | |
358 | if (ret) { | |
feccf398 | 359 | ida_simple_remove(&iommu_group_ida, group->id); |
d72e31c9 AW |
360 | kfree(group); |
361 | return ERR_PTR(ret); | |
362 | } | |
363 | ||
364 | group->devices_kobj = kobject_create_and_add("devices", &group->kobj); | |
365 | if (!group->devices_kobj) { | |
366 | kobject_put(&group->kobj); /* triggers .release & free */ | |
367 | return ERR_PTR(-ENOMEM); | |
368 | } | |
369 | ||
370 | /* | |
371 | * The devices_kobj holds a reference on the group kobject, so | |
372 | * as long as that exists so will the group. We can therefore | |
373 | * use the devices_kobj for reference counting. | |
374 | */ | |
375 | kobject_put(&group->kobj); | |
376 | ||
bc7d12b9 EA |
377 | ret = iommu_group_create_file(group, |
378 | &iommu_group_attr_reserved_regions); | |
379 | if (ret) | |
380 | return ERR_PTR(ret); | |
381 | ||
269aa808 JR |
382 | pr_debug("Allocated group %d\n", group->id); |
383 | ||
d72e31c9 AW |
384 | return group; |
385 | } | |
386 | EXPORT_SYMBOL_GPL(iommu_group_alloc); | |
387 | ||
aa16bea9 AK |
388 | struct iommu_group *iommu_group_get_by_id(int id) |
389 | { | |
390 | struct kobject *group_kobj; | |
391 | struct iommu_group *group; | |
392 | const char *name; | |
393 | ||
394 | if (!iommu_group_kset) | |
395 | return NULL; | |
396 | ||
397 | name = kasprintf(GFP_KERNEL, "%d", id); | |
398 | if (!name) | |
399 | return NULL; | |
400 | ||
401 | group_kobj = kset_find_obj(iommu_group_kset, name); | |
402 | kfree(name); | |
403 | ||
404 | if (!group_kobj) | |
405 | return NULL; | |
406 | ||
407 | group = container_of(group_kobj, struct iommu_group, kobj); | |
408 | BUG_ON(group->id != id); | |
409 | ||
410 | kobject_get(group->devices_kobj); | |
411 | kobject_put(&group->kobj); | |
412 | ||
413 | return group; | |
414 | } | |
415 | EXPORT_SYMBOL_GPL(iommu_group_get_by_id); | |
416 | ||
d72e31c9 AW |
417 | /** |
418 | * iommu_group_get_iommudata - retrieve iommu_data registered for a group | |
419 | * @group: the group | |
420 | * | |
421 | * iommu drivers can store data in the group for use when doing iommu | |
422 | * operations. This function provides a way to retrieve it. Caller | |
423 | * should hold a group reference. | |
424 | */ | |
425 | void *iommu_group_get_iommudata(struct iommu_group *group) | |
426 | { | |
427 | return group->iommu_data; | |
428 | } | |
429 | EXPORT_SYMBOL_GPL(iommu_group_get_iommudata); | |
430 | ||
431 | /** | |
432 | * iommu_group_set_iommudata - set iommu_data for a group | |
433 | * @group: the group | |
434 | * @iommu_data: new data | |
435 | * @release: release function for iommu_data | |
436 | * | |
437 | * iommu drivers can store data in the group for use when doing iommu | |
438 | * operations. This function provides a way to set the data after | |
439 | * the group has been allocated. Caller should hold a group reference. | |
440 | */ | |
441 | void iommu_group_set_iommudata(struct iommu_group *group, void *iommu_data, | |
442 | void (*release)(void *iommu_data)) | |
1460432c | 443 | { |
d72e31c9 AW |
444 | group->iommu_data = iommu_data; |
445 | group->iommu_data_release = release; | |
446 | } | |
447 | EXPORT_SYMBOL_GPL(iommu_group_set_iommudata); | |
1460432c | 448 | |
d72e31c9 AW |
449 | /** |
450 | * iommu_group_set_name - set name for a group | |
451 | * @group: the group | |
452 | * @name: name | |
453 | * | |
454 | * Allow iommu driver to set a name for a group. When set it will | |
455 | * appear in a name attribute file under the group in sysfs. | |
456 | */ | |
457 | int iommu_group_set_name(struct iommu_group *group, const char *name) | |
458 | { | |
459 | int ret; | |
460 | ||
461 | if (group->name) { | |
462 | iommu_group_remove_file(group, &iommu_group_attr_name); | |
463 | kfree(group->name); | |
464 | group->name = NULL; | |
465 | if (!name) | |
466 | return 0; | |
467 | } | |
468 | ||
469 | group->name = kstrdup(name, GFP_KERNEL); | |
470 | if (!group->name) | |
471 | return -ENOMEM; | |
472 | ||
473 | ret = iommu_group_create_file(group, &iommu_group_attr_name); | |
474 | if (ret) { | |
475 | kfree(group->name); | |
476 | group->name = NULL; | |
477 | return ret; | |
478 | } | |
1460432c AW |
479 | |
480 | return 0; | |
481 | } | |
d72e31c9 | 482 | EXPORT_SYMBOL_GPL(iommu_group_set_name); |
1460432c | 483 | |
beed2821 JR |
484 | static int iommu_group_create_direct_mappings(struct iommu_group *group, |
485 | struct device *dev) | |
486 | { | |
487 | struct iommu_domain *domain = group->default_domain; | |
e5b5234a | 488 | struct iommu_resv_region *entry; |
beed2821 JR |
489 | struct list_head mappings; |
490 | unsigned long pg_size; | |
491 | int ret = 0; | |
492 | ||
493 | if (!domain || domain->type != IOMMU_DOMAIN_DMA) | |
494 | return 0; | |
495 | ||
d16e0faa | 496 | BUG_ON(!domain->pgsize_bitmap); |
beed2821 | 497 | |
d16e0faa | 498 | pg_size = 1UL << __ffs(domain->pgsize_bitmap); |
beed2821 JR |
499 | INIT_LIST_HEAD(&mappings); |
500 | ||
e5b5234a | 501 | iommu_get_resv_regions(dev, &mappings); |
beed2821 JR |
502 | |
503 | /* We need to consider overlapping regions for different devices */ | |
504 | list_for_each_entry(entry, &mappings, list) { | |
505 | dma_addr_t start, end, addr; | |
506 | ||
e5b5234a EA |
507 | if (domain->ops->apply_resv_region) |
508 | domain->ops->apply_resv_region(dev, domain, entry); | |
33b21a6b | 509 | |
beed2821 JR |
510 | start = ALIGN(entry->start, pg_size); |
511 | end = ALIGN(entry->start + entry->length, pg_size); | |
512 | ||
544a25d9 EA |
513 | if (entry->type != IOMMU_RESV_DIRECT) |
514 | continue; | |
515 | ||
beed2821 JR |
516 | for (addr = start; addr < end; addr += pg_size) { |
517 | phys_addr_t phys_addr; | |
518 | ||
519 | phys_addr = iommu_iova_to_phys(domain, addr); | |
520 | if (phys_addr) | |
521 | continue; | |
522 | ||
523 | ret = iommu_map(domain, addr, addr, pg_size, entry->prot); | |
524 | if (ret) | |
525 | goto out; | |
526 | } | |
527 | ||
528 | } | |
529 | ||
add02cfd JR |
530 | iommu_flush_tlb_all(domain); |
531 | ||
beed2821 | 532 | out: |
e5b5234a | 533 | iommu_put_resv_regions(dev, &mappings); |
beed2821 JR |
534 | |
535 | return ret; | |
536 | } | |
537 | ||
d72e31c9 AW |
538 | /** |
539 | * iommu_group_add_device - add a device to an iommu group | |
540 | * @group: the group into which to add the device (reference should be held) | |
541 | * @dev: the device | |
542 | * | |
543 | * This function is called by an iommu driver to add a device into a | |
544 | * group. Adding a device increments the group reference count. | |
545 | */ | |
546 | int iommu_group_add_device(struct iommu_group *group, struct device *dev) | |
1460432c | 547 | { |
d72e31c9 | 548 | int ret, i = 0; |
c09e22d5 | 549 | struct group_device *device; |
d72e31c9 AW |
550 | |
551 | device = kzalloc(sizeof(*device), GFP_KERNEL); | |
552 | if (!device) | |
553 | return -ENOMEM; | |
554 | ||
555 | device->dev = dev; | |
1460432c | 556 | |
d72e31c9 | 557 | ret = sysfs_create_link(&dev->kobj, &group->kobj, "iommu_group"); |
797a8b4d RM |
558 | if (ret) |
559 | goto err_free_device; | |
d72e31c9 AW |
560 | |
561 | device->name = kasprintf(GFP_KERNEL, "%s", kobject_name(&dev->kobj)); | |
562 | rename: | |
563 | if (!device->name) { | |
797a8b4d RM |
564 | ret = -ENOMEM; |
565 | goto err_remove_link; | |
d72e31c9 | 566 | } |
1460432c | 567 | |
d72e31c9 AW |
568 | ret = sysfs_create_link_nowarn(group->devices_kobj, |
569 | &dev->kobj, device->name); | |
570 | if (ret) { | |
d72e31c9 AW |
571 | if (ret == -EEXIST && i >= 0) { |
572 | /* | |
573 | * Account for the slim chance of collision | |
574 | * and append an instance to the name. | |
575 | */ | |
797a8b4d | 576 | kfree(device->name); |
d72e31c9 AW |
577 | device->name = kasprintf(GFP_KERNEL, "%s.%d", |
578 | kobject_name(&dev->kobj), i++); | |
579 | goto rename; | |
580 | } | |
797a8b4d | 581 | goto err_free_name; |
d72e31c9 AW |
582 | } |
583 | ||
584 | kobject_get(group->devices_kobj); | |
585 | ||
586 | dev->iommu_group = group; | |
587 | ||
beed2821 JR |
588 | iommu_group_create_direct_mappings(group, dev); |
589 | ||
d72e31c9 AW |
590 | mutex_lock(&group->mutex); |
591 | list_add_tail(&device->list, &group->devices); | |
e39cb8a3 | 592 | if (group->domain) |
797a8b4d | 593 | ret = __iommu_attach_device(group->domain, dev); |
d72e31c9 | 594 | mutex_unlock(&group->mutex); |
797a8b4d RM |
595 | if (ret) |
596 | goto err_put_group; | |
d72e31c9 AW |
597 | |
598 | /* Notify any listeners about change to group. */ | |
599 | blocking_notifier_call_chain(&group->notifier, | |
600 | IOMMU_GROUP_NOTIFY_ADD_DEVICE, dev); | |
d1cf7e82 SK |
601 | |
602 | trace_add_device_to_group(group->id, dev); | |
269aa808 JR |
603 | |
604 | pr_info("Adding device %s to group %d\n", dev_name(dev), group->id); | |
605 | ||
1460432c | 606 | return 0; |
797a8b4d RM |
607 | |
608 | err_put_group: | |
609 | mutex_lock(&group->mutex); | |
610 | list_del(&device->list); | |
611 | mutex_unlock(&group->mutex); | |
612 | dev->iommu_group = NULL; | |
613 | kobject_put(group->devices_kobj); | |
614 | err_free_name: | |
615 | kfree(device->name); | |
616 | err_remove_link: | |
617 | sysfs_remove_link(&dev->kobj, "iommu_group"); | |
618 | err_free_device: | |
619 | kfree(device); | |
620 | pr_err("Failed to add device %s to group %d: %d\n", dev_name(dev), group->id, ret); | |
621 | return ret; | |
1460432c | 622 | } |
d72e31c9 | 623 | EXPORT_SYMBOL_GPL(iommu_group_add_device); |
1460432c | 624 | |
d72e31c9 AW |
625 | /** |
626 | * iommu_group_remove_device - remove a device from it's current group | |
627 | * @dev: device to be removed | |
628 | * | |
629 | * This function is called by an iommu driver to remove the device from | |
630 | * it's current group. This decrements the iommu group reference count. | |
631 | */ | |
632 | void iommu_group_remove_device(struct device *dev) | |
633 | { | |
634 | struct iommu_group *group = dev->iommu_group; | |
c09e22d5 | 635 | struct group_device *tmp_device, *device = NULL; |
d72e31c9 | 636 | |
269aa808 JR |
637 | pr_info("Removing device %s from group %d\n", dev_name(dev), group->id); |
638 | ||
d72e31c9 AW |
639 | /* Pre-notify listeners that a device is being removed. */ |
640 | blocking_notifier_call_chain(&group->notifier, | |
641 | IOMMU_GROUP_NOTIFY_DEL_DEVICE, dev); | |
642 | ||
643 | mutex_lock(&group->mutex); | |
644 | list_for_each_entry(tmp_device, &group->devices, list) { | |
645 | if (tmp_device->dev == dev) { | |
646 | device = tmp_device; | |
647 | list_del(&device->list); | |
648 | break; | |
649 | } | |
650 | } | |
651 | mutex_unlock(&group->mutex); | |
652 | ||
653 | if (!device) | |
654 | return; | |
655 | ||
656 | sysfs_remove_link(group->devices_kobj, device->name); | |
657 | sysfs_remove_link(&dev->kobj, "iommu_group"); | |
658 | ||
2e757086 SK |
659 | trace_remove_device_from_group(group->id, dev); |
660 | ||
d72e31c9 AW |
661 | kfree(device->name); |
662 | kfree(device); | |
663 | dev->iommu_group = NULL; | |
664 | kobject_put(group->devices_kobj); | |
665 | } | |
666 | EXPORT_SYMBOL_GPL(iommu_group_remove_device); | |
667 | ||
426a2738 JR |
668 | static int iommu_group_device_count(struct iommu_group *group) |
669 | { | |
c09e22d5 | 670 | struct group_device *entry; |
426a2738 JR |
671 | int ret = 0; |
672 | ||
673 | list_for_each_entry(entry, &group->devices, list) | |
674 | ret++; | |
675 | ||
676 | return ret; | |
677 | } | |
678 | ||
d72e31c9 AW |
679 | /** |
680 | * iommu_group_for_each_dev - iterate over each device in the group | |
681 | * @group: the group | |
682 | * @data: caller opaque data to be passed to callback function | |
683 | * @fn: caller supplied callback function | |
684 | * | |
685 | * This function is called by group users to iterate over group devices. | |
686 | * Callers should hold a reference count to the group during callback. | |
687 | * The group->mutex is held across callbacks, which will block calls to | |
688 | * iommu_group_add/remove_device. | |
689 | */ | |
e39cb8a3 JR |
690 | static int __iommu_group_for_each_dev(struct iommu_group *group, void *data, |
691 | int (*fn)(struct device *, void *)) | |
d72e31c9 | 692 | { |
c09e22d5 | 693 | struct group_device *device; |
d72e31c9 AW |
694 | int ret = 0; |
695 | ||
d72e31c9 AW |
696 | list_for_each_entry(device, &group->devices, list) { |
697 | ret = fn(device->dev, data); | |
698 | if (ret) | |
699 | break; | |
700 | } | |
e39cb8a3 JR |
701 | return ret; |
702 | } | |
703 | ||
704 | ||
705 | int iommu_group_for_each_dev(struct iommu_group *group, void *data, | |
706 | int (*fn)(struct device *, void *)) | |
707 | { | |
708 | int ret; | |
709 | ||
710 | mutex_lock(&group->mutex); | |
711 | ret = __iommu_group_for_each_dev(group, data, fn); | |
d72e31c9 | 712 | mutex_unlock(&group->mutex); |
e39cb8a3 | 713 | |
d72e31c9 AW |
714 | return ret; |
715 | } | |
716 | EXPORT_SYMBOL_GPL(iommu_group_for_each_dev); | |
717 | ||
718 | /** | |
719 | * iommu_group_get - Return the group for a device and increment reference | |
720 | * @dev: get the group that this device belongs to | |
721 | * | |
722 | * This function is called by iommu drivers and users to get the group | |
723 | * for the specified device. If found, the group is returned and the group | |
724 | * reference in incremented, else NULL. | |
725 | */ | |
726 | struct iommu_group *iommu_group_get(struct device *dev) | |
727 | { | |
728 | struct iommu_group *group = dev->iommu_group; | |
729 | ||
730 | if (group) | |
731 | kobject_get(group->devices_kobj); | |
732 | ||
733 | return group; | |
734 | } | |
735 | EXPORT_SYMBOL_GPL(iommu_group_get); | |
736 | ||
13f59a78 RM |
737 | /** |
738 | * iommu_group_ref_get - Increment reference on a group | |
739 | * @group: the group to use, must not be NULL | |
740 | * | |
741 | * This function is called by iommu drivers to take additional references on an | |
742 | * existing group. Returns the given group for convenience. | |
743 | */ | |
744 | struct iommu_group *iommu_group_ref_get(struct iommu_group *group) | |
745 | { | |
746 | kobject_get(group->devices_kobj); | |
747 | return group; | |
748 | } | |
749 | ||
d72e31c9 AW |
750 | /** |
751 | * iommu_group_put - Decrement group reference | |
752 | * @group: the group to use | |
753 | * | |
754 | * This function is called by iommu drivers and users to release the | |
755 | * iommu group. Once the reference count is zero, the group is released. | |
756 | */ | |
757 | void iommu_group_put(struct iommu_group *group) | |
758 | { | |
759 | if (group) | |
760 | kobject_put(group->devices_kobj); | |
761 | } | |
762 | EXPORT_SYMBOL_GPL(iommu_group_put); | |
763 | ||
764 | /** | |
765 | * iommu_group_register_notifier - Register a notifier for group changes | |
766 | * @group: the group to watch | |
767 | * @nb: notifier block to signal | |
768 | * | |
769 | * This function allows iommu group users to track changes in a group. | |
770 | * See include/linux/iommu.h for actions sent via this notifier. Caller | |
771 | * should hold a reference to the group throughout notifier registration. | |
772 | */ | |
773 | int iommu_group_register_notifier(struct iommu_group *group, | |
774 | struct notifier_block *nb) | |
775 | { | |
776 | return blocking_notifier_chain_register(&group->notifier, nb); | |
777 | } | |
778 | EXPORT_SYMBOL_GPL(iommu_group_register_notifier); | |
779 | ||
780 | /** | |
781 | * iommu_group_unregister_notifier - Unregister a notifier | |
782 | * @group: the group to watch | |
783 | * @nb: notifier block to signal | |
784 | * | |
785 | * Unregister a previously registered group notifier block. | |
786 | */ | |
787 | int iommu_group_unregister_notifier(struct iommu_group *group, | |
788 | struct notifier_block *nb) | |
789 | { | |
790 | return blocking_notifier_chain_unregister(&group->notifier, nb); | |
791 | } | |
792 | EXPORT_SYMBOL_GPL(iommu_group_unregister_notifier); | |
793 | ||
794 | /** | |
795 | * iommu_group_id - Return ID for a group | |
796 | * @group: the group to ID | |
797 | * | |
798 | * Return the unique ID for the group matching the sysfs group number. | |
799 | */ | |
800 | int iommu_group_id(struct iommu_group *group) | |
801 | { | |
802 | return group->id; | |
803 | } | |
804 | EXPORT_SYMBOL_GPL(iommu_group_id); | |
1460432c | 805 | |
f096c061 AW |
806 | static struct iommu_group *get_pci_alias_group(struct pci_dev *pdev, |
807 | unsigned long *devfns); | |
808 | ||
104a1c13 AW |
809 | /* |
810 | * To consider a PCI device isolated, we require ACS to support Source | |
811 | * Validation, Request Redirection, Completer Redirection, and Upstream | |
812 | * Forwarding. This effectively means that devices cannot spoof their | |
813 | * requester ID, requests and completions cannot be redirected, and all | |
814 | * transactions are forwarded upstream, even as it passes through a | |
815 | * bridge where the target device is downstream. | |
816 | */ | |
817 | #define REQ_ACS_FLAGS (PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF) | |
818 | ||
f096c061 AW |
819 | /* |
820 | * For multifunction devices which are not isolated from each other, find | |
821 | * all the other non-isolated functions and look for existing groups. For | |
822 | * each function, we also need to look for aliases to or from other devices | |
823 | * that may already have a group. | |
824 | */ | |
825 | static struct iommu_group *get_pci_function_alias_group(struct pci_dev *pdev, | |
826 | unsigned long *devfns) | |
827 | { | |
828 | struct pci_dev *tmp = NULL; | |
829 | struct iommu_group *group; | |
830 | ||
831 | if (!pdev->multifunction || pci_acs_enabled(pdev, REQ_ACS_FLAGS)) | |
832 | return NULL; | |
833 | ||
834 | for_each_pci_dev(tmp) { | |
835 | if (tmp == pdev || tmp->bus != pdev->bus || | |
836 | PCI_SLOT(tmp->devfn) != PCI_SLOT(pdev->devfn) || | |
837 | pci_acs_enabled(tmp, REQ_ACS_FLAGS)) | |
838 | continue; | |
839 | ||
840 | group = get_pci_alias_group(tmp, devfns); | |
841 | if (group) { | |
842 | pci_dev_put(tmp); | |
843 | return group; | |
844 | } | |
845 | } | |
846 | ||
847 | return NULL; | |
848 | } | |
849 | ||
850 | /* | |
338c3149 JL |
851 | * Look for aliases to or from the given device for existing groups. DMA |
852 | * aliases are only supported on the same bus, therefore the search | |
f096c061 AW |
853 | * space is quite small (especially since we're really only looking at pcie |
854 | * device, and therefore only expect multiple slots on the root complex or | |
855 | * downstream switch ports). It's conceivable though that a pair of | |
856 | * multifunction devices could have aliases between them that would cause a | |
857 | * loop. To prevent this, we use a bitmap to track where we've been. | |
858 | */ | |
859 | static struct iommu_group *get_pci_alias_group(struct pci_dev *pdev, | |
860 | unsigned long *devfns) | |
861 | { | |
862 | struct pci_dev *tmp = NULL; | |
863 | struct iommu_group *group; | |
864 | ||
865 | if (test_and_set_bit(pdev->devfn & 0xff, devfns)) | |
866 | return NULL; | |
867 | ||
868 | group = iommu_group_get(&pdev->dev); | |
869 | if (group) | |
870 | return group; | |
871 | ||
872 | for_each_pci_dev(tmp) { | |
873 | if (tmp == pdev || tmp->bus != pdev->bus) | |
874 | continue; | |
875 | ||
876 | /* We alias them or they alias us */ | |
338c3149 | 877 | if (pci_devs_are_dma_aliases(pdev, tmp)) { |
f096c061 AW |
878 | group = get_pci_alias_group(tmp, devfns); |
879 | if (group) { | |
880 | pci_dev_put(tmp); | |
881 | return group; | |
882 | } | |
883 | ||
884 | group = get_pci_function_alias_group(tmp, devfns); | |
885 | if (group) { | |
886 | pci_dev_put(tmp); | |
887 | return group; | |
888 | } | |
889 | } | |
890 | } | |
891 | ||
892 | return NULL; | |
893 | } | |
894 | ||
104a1c13 AW |
895 | struct group_for_pci_data { |
896 | struct pci_dev *pdev; | |
897 | struct iommu_group *group; | |
898 | }; | |
899 | ||
900 | /* | |
901 | * DMA alias iterator callback, return the last seen device. Stop and return | |
902 | * the IOMMU group if we find one along the way. | |
903 | */ | |
904 | static int get_pci_alias_or_group(struct pci_dev *pdev, u16 alias, void *opaque) | |
905 | { | |
906 | struct group_for_pci_data *data = opaque; | |
907 | ||
908 | data->pdev = pdev; | |
909 | data->group = iommu_group_get(&pdev->dev); | |
910 | ||
911 | return data->group != NULL; | |
912 | } | |
913 | ||
6eab556a JR |
914 | /* |
915 | * Generic device_group call-back function. It just allocates one | |
916 | * iommu-group per device. | |
917 | */ | |
918 | struct iommu_group *generic_device_group(struct device *dev) | |
919 | { | |
7f7a2304 | 920 | return iommu_group_alloc(); |
6eab556a JR |
921 | } |
922 | ||
104a1c13 AW |
923 | /* |
924 | * Use standard PCI bus topology, isolation features, and DMA alias quirks | |
925 | * to find or create an IOMMU group for a device. | |
926 | */ | |
5e62292b | 927 | struct iommu_group *pci_device_group(struct device *dev) |
104a1c13 | 928 | { |
5e62292b | 929 | struct pci_dev *pdev = to_pci_dev(dev); |
104a1c13 AW |
930 | struct group_for_pci_data data; |
931 | struct pci_bus *bus; | |
932 | struct iommu_group *group = NULL; | |
f096c061 | 933 | u64 devfns[4] = { 0 }; |
104a1c13 | 934 | |
5e62292b JR |
935 | if (WARN_ON(!dev_is_pci(dev))) |
936 | return ERR_PTR(-EINVAL); | |
937 | ||
104a1c13 AW |
938 | /* |
939 | * Find the upstream DMA alias for the device. A device must not | |
940 | * be aliased due to topology in order to have its own IOMMU group. | |
941 | * If we find an alias along the way that already belongs to a | |
942 | * group, use it. | |
943 | */ | |
944 | if (pci_for_each_dma_alias(pdev, get_pci_alias_or_group, &data)) | |
945 | return data.group; | |
946 | ||
947 | pdev = data.pdev; | |
948 | ||
949 | /* | |
950 | * Continue upstream from the point of minimum IOMMU granularity | |
951 | * due to aliases to the point where devices are protected from | |
952 | * peer-to-peer DMA by PCI ACS. Again, if we find an existing | |
953 | * group, use it. | |
954 | */ | |
955 | for (bus = pdev->bus; !pci_is_root_bus(bus); bus = bus->parent) { | |
956 | if (!bus->self) | |
957 | continue; | |
958 | ||
959 | if (pci_acs_path_enabled(bus->self, NULL, REQ_ACS_FLAGS)) | |
960 | break; | |
961 | ||
962 | pdev = bus->self; | |
963 | ||
964 | group = iommu_group_get(&pdev->dev); | |
965 | if (group) | |
966 | return group; | |
967 | } | |
968 | ||
969 | /* | |
f096c061 AW |
970 | * Look for existing groups on device aliases. If we alias another |
971 | * device or another device aliases us, use the same group. | |
104a1c13 | 972 | */ |
f096c061 AW |
973 | group = get_pci_alias_group(pdev, (unsigned long *)devfns); |
974 | if (group) | |
975 | return group; | |
104a1c13 AW |
976 | |
977 | /* | |
f096c061 AW |
978 | * Look for existing groups on non-isolated functions on the same |
979 | * slot and aliases of those funcions, if any. No need to clear | |
980 | * the search bitmap, the tested devfns are still valid. | |
104a1c13 | 981 | */ |
f096c061 AW |
982 | group = get_pci_function_alias_group(pdev, (unsigned long *)devfns); |
983 | if (group) | |
984 | return group; | |
104a1c13 AW |
985 | |
986 | /* No shared group found, allocate new */ | |
7f7a2304 | 987 | return iommu_group_alloc(); |
104a1c13 AW |
988 | } |
989 | ||
990 | /** | |
991 | * iommu_group_get_for_dev - Find or create the IOMMU group for a device | |
992 | * @dev: target device | |
993 | * | |
994 | * This function is intended to be called by IOMMU drivers and extended to | |
995 | * support common, bus-defined algorithms when determining or creating the | |
996 | * IOMMU group for a device. On success, the caller will hold a reference | |
997 | * to the returned IOMMU group, which will already include the provided | |
998 | * device. The reference should be released with iommu_group_put(). | |
999 | */ | |
1000 | struct iommu_group *iommu_group_get_for_dev(struct device *dev) | |
1001 | { | |
46c6b2bc | 1002 | const struct iommu_ops *ops = dev->bus->iommu_ops; |
c4a783b8 | 1003 | struct iommu_group *group; |
104a1c13 AW |
1004 | int ret; |
1005 | ||
1006 | group = iommu_group_get(dev); | |
1007 | if (group) | |
1008 | return group; | |
1009 | ||
05f80300 RM |
1010 | if (!ops) |
1011 | return ERR_PTR(-EINVAL); | |
104a1c13 | 1012 | |
05f80300 | 1013 | group = ops->device_group(dev); |
72dcac63 JR |
1014 | if (WARN_ON_ONCE(group == NULL)) |
1015 | return ERR_PTR(-EINVAL); | |
1016 | ||
104a1c13 AW |
1017 | if (IS_ERR(group)) |
1018 | return group; | |
1019 | ||
1228236d JR |
1020 | /* |
1021 | * Try to allocate a default domain - needs support from the | |
1022 | * IOMMU driver. | |
1023 | */ | |
1024 | if (!group->default_domain) { | |
fccb4e3b WD |
1025 | struct iommu_domain *dom; |
1026 | ||
1027 | dom = __iommu_domain_alloc(dev->bus, iommu_def_domain_type); | |
1028 | if (!dom && iommu_def_domain_type != IOMMU_DOMAIN_DMA) { | |
1029 | dev_warn(dev, | |
1030 | "failed to allocate default IOMMU domain of type %u; falling back to IOMMU_DOMAIN_DMA", | |
1031 | iommu_def_domain_type); | |
1032 | dom = __iommu_domain_alloc(dev->bus, IOMMU_DOMAIN_DMA); | |
1033 | } | |
1034 | ||
1035 | group->default_domain = dom; | |
eebb8034 | 1036 | if (!group->domain) |
fccb4e3b | 1037 | group->domain = dom; |
1228236d JR |
1038 | } |
1039 | ||
104a1c13 AW |
1040 | ret = iommu_group_add_device(group, dev); |
1041 | if (ret) { | |
1042 | iommu_group_put(group); | |
1043 | return ERR_PTR(ret); | |
1044 | } | |
1045 | ||
1046 | return group; | |
1047 | } | |
1048 | ||
6827ca83 JR |
1049 | struct iommu_domain *iommu_group_default_domain(struct iommu_group *group) |
1050 | { | |
1051 | return group->default_domain; | |
1052 | } | |
1053 | ||
d72e31c9 | 1054 | static int add_iommu_group(struct device *dev, void *data) |
1460432c | 1055 | { |
b22f6434 TR |
1056 | struct iommu_callback_data *cb = data; |
1057 | const struct iommu_ops *ops = cb->ops; | |
38667f18 | 1058 | int ret; |
d72e31c9 AW |
1059 | |
1060 | if (!ops->add_device) | |
461bfb3f | 1061 | return 0; |
1460432c | 1062 | |
d72e31c9 AW |
1063 | WARN_ON(dev->iommu_group); |
1064 | ||
38667f18 JR |
1065 | ret = ops->add_device(dev); |
1066 | ||
1067 | /* | |
1068 | * We ignore -ENODEV errors for now, as they just mean that the | |
1069 | * device is not translated by an IOMMU. We still care about | |
1070 | * other errors and fail to initialize when they happen. | |
1071 | */ | |
1072 | if (ret == -ENODEV) | |
1073 | ret = 0; | |
1074 | ||
1075 | return ret; | |
1460432c AW |
1076 | } |
1077 | ||
8da30142 JR |
1078 | static int remove_iommu_group(struct device *dev, void *data) |
1079 | { | |
1080 | struct iommu_callback_data *cb = data; | |
1081 | const struct iommu_ops *ops = cb->ops; | |
1082 | ||
1083 | if (ops->remove_device && dev->iommu_group) | |
1084 | ops->remove_device(dev); | |
1460432c AW |
1085 | |
1086 | return 0; | |
1087 | } | |
1088 | ||
d72e31c9 AW |
1089 | static int iommu_bus_notifier(struct notifier_block *nb, |
1090 | unsigned long action, void *data) | |
1460432c AW |
1091 | { |
1092 | struct device *dev = data; | |
b22f6434 | 1093 | const struct iommu_ops *ops = dev->bus->iommu_ops; |
d72e31c9 AW |
1094 | struct iommu_group *group; |
1095 | unsigned long group_action = 0; | |
1096 | ||
1097 | /* | |
1098 | * ADD/DEL call into iommu driver ops if provided, which may | |
1099 | * result in ADD/DEL notifiers to group->notifier | |
1100 | */ | |
1101 | if (action == BUS_NOTIFY_ADD_DEVICE) { | |
3ba8775f | 1102 | if (ops->add_device) { |
1103 | int ret; | |
1104 | ||
1105 | ret = ops->add_device(dev); | |
1106 | return (ret) ? NOTIFY_DONE : NOTIFY_OK; | |
1107 | } | |
843cb6dc | 1108 | } else if (action == BUS_NOTIFY_REMOVED_DEVICE) { |
d72e31c9 AW |
1109 | if (ops->remove_device && dev->iommu_group) { |
1110 | ops->remove_device(dev); | |
1111 | return 0; | |
1112 | } | |
1113 | } | |
1460432c | 1114 | |
d72e31c9 AW |
1115 | /* |
1116 | * Remaining BUS_NOTIFYs get filtered and republished to the | |
1117 | * group, if anyone is listening | |
1118 | */ | |
1119 | group = iommu_group_get(dev); | |
1120 | if (!group) | |
1121 | return 0; | |
1460432c | 1122 | |
d72e31c9 AW |
1123 | switch (action) { |
1124 | case BUS_NOTIFY_BIND_DRIVER: | |
1125 | group_action = IOMMU_GROUP_NOTIFY_BIND_DRIVER; | |
1126 | break; | |
1127 | case BUS_NOTIFY_BOUND_DRIVER: | |
1128 | group_action = IOMMU_GROUP_NOTIFY_BOUND_DRIVER; | |
1129 | break; | |
1130 | case BUS_NOTIFY_UNBIND_DRIVER: | |
1131 | group_action = IOMMU_GROUP_NOTIFY_UNBIND_DRIVER; | |
1132 | break; | |
1133 | case BUS_NOTIFY_UNBOUND_DRIVER: | |
1134 | group_action = IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER; | |
1135 | break; | |
1136 | } | |
1460432c | 1137 | |
d72e31c9 AW |
1138 | if (group_action) |
1139 | blocking_notifier_call_chain(&group->notifier, | |
1140 | group_action, dev); | |
1460432c | 1141 | |
d72e31c9 | 1142 | iommu_group_put(group); |
1460432c AW |
1143 | return 0; |
1144 | } | |
1145 | ||
fb3e3065 | 1146 | static int iommu_bus_init(struct bus_type *bus, const struct iommu_ops *ops) |
ff21776d | 1147 | { |
fb3e3065 MS |
1148 | int err; |
1149 | struct notifier_block *nb; | |
b22f6434 TR |
1150 | struct iommu_callback_data cb = { |
1151 | .ops = ops, | |
1152 | }; | |
1153 | ||
fb3e3065 MS |
1154 | nb = kzalloc(sizeof(struct notifier_block), GFP_KERNEL); |
1155 | if (!nb) | |
1156 | return -ENOMEM; | |
1157 | ||
1158 | nb->notifier_call = iommu_bus_notifier; | |
1159 | ||
1160 | err = bus_register_notifier(bus, nb); | |
8da30142 JR |
1161 | if (err) |
1162 | goto out_free; | |
d7da6bdc HS |
1163 | |
1164 | err = bus_for_each_dev(bus, NULL, &cb, add_iommu_group); | |
8da30142 JR |
1165 | if (err) |
1166 | goto out_err; | |
1167 | ||
d7da6bdc HS |
1168 | |
1169 | return 0; | |
8da30142 JR |
1170 | |
1171 | out_err: | |
1172 | /* Clean up */ | |
1173 | bus_for_each_dev(bus, NULL, &cb, remove_iommu_group); | |
1174 | bus_unregister_notifier(bus, nb); | |
1175 | ||
1176 | out_free: | |
1177 | kfree(nb); | |
1178 | ||
1179 | return err; | |
ff21776d | 1180 | } |
fc2100eb | 1181 | |
ff21776d JR |
1182 | /** |
1183 | * bus_set_iommu - set iommu-callbacks for the bus | |
1184 | * @bus: bus. | |
1185 | * @ops: the callbacks provided by the iommu-driver | |
1186 | * | |
1187 | * This function is called by an iommu driver to set the iommu methods | |
1188 | * used for a particular bus. Drivers for devices on that bus can use | |
1189 | * the iommu-api after these ops are registered. | |
1190 | * This special function is needed because IOMMUs are usually devices on | |
1191 | * the bus itself, so the iommu drivers are not initialized when the bus | |
1192 | * is set up. With this function the iommu-driver can set the iommu-ops | |
1193 | * afterwards. | |
1194 | */ | |
b22f6434 | 1195 | int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops) |
fc2100eb | 1196 | { |
d7da6bdc HS |
1197 | int err; |
1198 | ||
ff21776d JR |
1199 | if (bus->iommu_ops != NULL) |
1200 | return -EBUSY; | |
fc2100eb | 1201 | |
ff21776d JR |
1202 | bus->iommu_ops = ops; |
1203 | ||
1204 | /* Do IOMMU specific setup for this bus-type */ | |
d7da6bdc HS |
1205 | err = iommu_bus_init(bus, ops); |
1206 | if (err) | |
1207 | bus->iommu_ops = NULL; | |
1208 | ||
1209 | return err; | |
fc2100eb | 1210 | } |
ff21776d | 1211 | EXPORT_SYMBOL_GPL(bus_set_iommu); |
fc2100eb | 1212 | |
a1b60c1c | 1213 | bool iommu_present(struct bus_type *bus) |
fc2100eb | 1214 | { |
94441c3b | 1215 | return bus->iommu_ops != NULL; |
fc2100eb | 1216 | } |
a1b60c1c | 1217 | EXPORT_SYMBOL_GPL(iommu_present); |
fc2100eb | 1218 | |
3c0e0ca0 JR |
1219 | bool iommu_capable(struct bus_type *bus, enum iommu_cap cap) |
1220 | { | |
1221 | if (!bus->iommu_ops || !bus->iommu_ops->capable) | |
1222 | return false; | |
1223 | ||
1224 | return bus->iommu_ops->capable(cap); | |
1225 | } | |
1226 | EXPORT_SYMBOL_GPL(iommu_capable); | |
1227 | ||
4f3f8d9d OBC |
1228 | /** |
1229 | * iommu_set_fault_handler() - set a fault handler for an iommu domain | |
1230 | * @domain: iommu domain | |
1231 | * @handler: fault handler | |
77ca2332 | 1232 | * @token: user data, will be passed back to the fault handler |
0ed6d2d2 OBC |
1233 | * |
1234 | * This function should be used by IOMMU users which want to be notified | |
1235 | * whenever an IOMMU fault happens. | |
1236 | * | |
1237 | * The fault handler itself should return 0 on success, and an appropriate | |
1238 | * error code otherwise. | |
4f3f8d9d OBC |
1239 | */ |
1240 | void iommu_set_fault_handler(struct iommu_domain *domain, | |
77ca2332 OBC |
1241 | iommu_fault_handler_t handler, |
1242 | void *token) | |
4f3f8d9d OBC |
1243 | { |
1244 | BUG_ON(!domain); | |
1245 | ||
1246 | domain->handler = handler; | |
77ca2332 | 1247 | domain->handler_token = token; |
4f3f8d9d | 1248 | } |
30bd918c | 1249 | EXPORT_SYMBOL_GPL(iommu_set_fault_handler); |
4f3f8d9d | 1250 | |
53723dc5 JR |
1251 | static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus, |
1252 | unsigned type) | |
fc2100eb JR |
1253 | { |
1254 | struct iommu_domain *domain; | |
fc2100eb | 1255 | |
94441c3b | 1256 | if (bus == NULL || bus->iommu_ops == NULL) |
905d66c1 JR |
1257 | return NULL; |
1258 | ||
53723dc5 | 1259 | domain = bus->iommu_ops->domain_alloc(type); |
fc2100eb JR |
1260 | if (!domain) |
1261 | return NULL; | |
1262 | ||
8539c7c1 | 1263 | domain->ops = bus->iommu_ops; |
53723dc5 | 1264 | domain->type = type; |
d16e0faa RM |
1265 | /* Assume all sizes by default; the driver may override this later */ |
1266 | domain->pgsize_bitmap = bus->iommu_ops->pgsize_bitmap; | |
905d66c1 | 1267 | |
fc2100eb | 1268 | return domain; |
fc2100eb | 1269 | } |
fc2100eb | 1270 | |
53723dc5 JR |
1271 | struct iommu_domain *iommu_domain_alloc(struct bus_type *bus) |
1272 | { | |
1273 | return __iommu_domain_alloc(bus, IOMMU_DOMAIN_UNMANAGED); | |
fc2100eb JR |
1274 | } |
1275 | EXPORT_SYMBOL_GPL(iommu_domain_alloc); | |
1276 | ||
1277 | void iommu_domain_free(struct iommu_domain *domain) | |
1278 | { | |
89be34a1 | 1279 | domain->ops->domain_free(domain); |
fc2100eb JR |
1280 | } |
1281 | EXPORT_SYMBOL_GPL(iommu_domain_free); | |
1282 | ||
426a2738 JR |
1283 | static int __iommu_attach_device(struct iommu_domain *domain, |
1284 | struct device *dev) | |
fc2100eb | 1285 | { |
b54db778 | 1286 | int ret; |
e01d1913 BH |
1287 | if ((domain->ops->is_attach_deferred != NULL) && |
1288 | domain->ops->is_attach_deferred(domain, dev)) | |
1289 | return 0; | |
1290 | ||
e5aa7f00 JR |
1291 | if (unlikely(domain->ops->attach_dev == NULL)) |
1292 | return -ENODEV; | |
1293 | ||
b54db778 SK |
1294 | ret = domain->ops->attach_dev(domain, dev); |
1295 | if (!ret) | |
1296 | trace_attach_device_to_domain(dev); | |
1297 | return ret; | |
fc2100eb | 1298 | } |
426a2738 JR |
1299 | |
1300 | int iommu_attach_device(struct iommu_domain *domain, struct device *dev) | |
1301 | { | |
1302 | struct iommu_group *group; | |
1303 | int ret; | |
1304 | ||
1305 | group = iommu_group_get(dev); | |
426a2738 | 1306 | /* |
05f80300 | 1307 | * Lock the group to make sure the device-count doesn't |
426a2738 JR |
1308 | * change while we are attaching |
1309 | */ | |
1310 | mutex_lock(&group->mutex); | |
1311 | ret = -EINVAL; | |
1312 | if (iommu_group_device_count(group) != 1) | |
1313 | goto out_unlock; | |
1314 | ||
e39cb8a3 | 1315 | ret = __iommu_attach_group(domain, group); |
426a2738 JR |
1316 | |
1317 | out_unlock: | |
1318 | mutex_unlock(&group->mutex); | |
1319 | iommu_group_put(group); | |
1320 | ||
1321 | return ret; | |
1322 | } | |
fc2100eb JR |
1323 | EXPORT_SYMBOL_GPL(iommu_attach_device); |
1324 | ||
426a2738 JR |
1325 | static void __iommu_detach_device(struct iommu_domain *domain, |
1326 | struct device *dev) | |
fc2100eb | 1327 | { |
e01d1913 BH |
1328 | if ((domain->ops->is_attach_deferred != NULL) && |
1329 | domain->ops->is_attach_deferred(domain, dev)) | |
1330 | return; | |
1331 | ||
e5aa7f00 JR |
1332 | if (unlikely(domain->ops->detach_dev == NULL)) |
1333 | return; | |
1334 | ||
1335 | domain->ops->detach_dev(domain, dev); | |
69980630 | 1336 | trace_detach_device_from_domain(dev); |
fc2100eb | 1337 | } |
426a2738 JR |
1338 | |
1339 | void iommu_detach_device(struct iommu_domain *domain, struct device *dev) | |
1340 | { | |
1341 | struct iommu_group *group; | |
1342 | ||
1343 | group = iommu_group_get(dev); | |
426a2738 JR |
1344 | |
1345 | mutex_lock(&group->mutex); | |
1346 | if (iommu_group_device_count(group) != 1) { | |
1347 | WARN_ON(1); | |
1348 | goto out_unlock; | |
1349 | } | |
1350 | ||
e39cb8a3 | 1351 | __iommu_detach_group(domain, group); |
426a2738 JR |
1352 | |
1353 | out_unlock: | |
1354 | mutex_unlock(&group->mutex); | |
1355 | iommu_group_put(group); | |
1356 | } | |
fc2100eb JR |
1357 | EXPORT_SYMBOL_GPL(iommu_detach_device); |
1358 | ||
2c1296d9 JR |
1359 | struct iommu_domain *iommu_get_domain_for_dev(struct device *dev) |
1360 | { | |
1361 | struct iommu_domain *domain; | |
1362 | struct iommu_group *group; | |
1363 | ||
1364 | group = iommu_group_get(dev); | |
1464d0b1 | 1365 | if (!group) |
2c1296d9 JR |
1366 | return NULL; |
1367 | ||
1368 | domain = group->domain; | |
1369 | ||
1370 | iommu_group_put(group); | |
1371 | ||
1372 | return domain; | |
1373 | } | |
1374 | EXPORT_SYMBOL_GPL(iommu_get_domain_for_dev); | |
fc2100eb | 1375 | |
d72e31c9 AW |
1376 | /* |
1377 | * IOMMU groups are really the natrual working unit of the IOMMU, but | |
1378 | * the IOMMU API works on domains and devices. Bridge that gap by | |
1379 | * iterating over the devices in a group. Ideally we'd have a single | |
1380 | * device which represents the requestor ID of the group, but we also | |
1381 | * allow IOMMU drivers to create policy defined minimum sets, where | |
1382 | * the physical hardware may be able to distiguish members, but we | |
1383 | * wish to group them at a higher level (ex. untrusted multi-function | |
1384 | * PCI devices). Thus we attach each device. | |
1385 | */ | |
1386 | static int iommu_group_do_attach_device(struct device *dev, void *data) | |
1387 | { | |
1388 | struct iommu_domain *domain = data; | |
1389 | ||
426a2738 | 1390 | return __iommu_attach_device(domain, dev); |
d72e31c9 AW |
1391 | } |
1392 | ||
e39cb8a3 JR |
1393 | static int __iommu_attach_group(struct iommu_domain *domain, |
1394 | struct iommu_group *group) | |
1395 | { | |
1396 | int ret; | |
1397 | ||
1398 | if (group->default_domain && group->domain != group->default_domain) | |
1399 | return -EBUSY; | |
1400 | ||
1401 | ret = __iommu_group_for_each_dev(group, domain, | |
1402 | iommu_group_do_attach_device); | |
1403 | if (ret == 0) | |
1404 | group->domain = domain; | |
1405 | ||
1406 | return ret; | |
d72e31c9 AW |
1407 | } |
1408 | ||
1409 | int iommu_attach_group(struct iommu_domain *domain, struct iommu_group *group) | |
1410 | { | |
e39cb8a3 JR |
1411 | int ret; |
1412 | ||
1413 | mutex_lock(&group->mutex); | |
1414 | ret = __iommu_attach_group(domain, group); | |
1415 | mutex_unlock(&group->mutex); | |
1416 | ||
1417 | return ret; | |
d72e31c9 AW |
1418 | } |
1419 | EXPORT_SYMBOL_GPL(iommu_attach_group); | |
1420 | ||
1421 | static int iommu_group_do_detach_device(struct device *dev, void *data) | |
1422 | { | |
1423 | struct iommu_domain *domain = data; | |
1424 | ||
426a2738 | 1425 | __iommu_detach_device(domain, dev); |
d72e31c9 AW |
1426 | |
1427 | return 0; | |
1428 | } | |
1429 | ||
e39cb8a3 JR |
1430 | static void __iommu_detach_group(struct iommu_domain *domain, |
1431 | struct iommu_group *group) | |
1432 | { | |
1433 | int ret; | |
1434 | ||
1435 | if (!group->default_domain) { | |
1436 | __iommu_group_for_each_dev(group, domain, | |
1437 | iommu_group_do_detach_device); | |
1438 | group->domain = NULL; | |
1439 | return; | |
1440 | } | |
1441 | ||
1442 | if (group->domain == group->default_domain) | |
1443 | return; | |
1444 | ||
1445 | /* Detach by re-attaching to the default domain */ | |
1446 | ret = __iommu_group_for_each_dev(group, group->default_domain, | |
1447 | iommu_group_do_attach_device); | |
1448 | if (ret != 0) | |
1449 | WARN_ON(1); | |
1450 | else | |
1451 | group->domain = group->default_domain; | |
1452 | } | |
1453 | ||
d72e31c9 AW |
1454 | void iommu_detach_group(struct iommu_domain *domain, struct iommu_group *group) |
1455 | { | |
e39cb8a3 JR |
1456 | mutex_lock(&group->mutex); |
1457 | __iommu_detach_group(domain, group); | |
1458 | mutex_unlock(&group->mutex); | |
d72e31c9 AW |
1459 | } |
1460 | EXPORT_SYMBOL_GPL(iommu_detach_group); | |
1461 | ||
bb5547ac | 1462 | phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova) |
fc2100eb | 1463 | { |
e5aa7f00 JR |
1464 | if (unlikely(domain->ops->iova_to_phys == NULL)) |
1465 | return 0; | |
1466 | ||
1467 | return domain->ops->iova_to_phys(domain, iova); | |
fc2100eb JR |
1468 | } |
1469 | EXPORT_SYMBOL_GPL(iommu_iova_to_phys); | |
dbb9fd86 | 1470 | |
bd13969b AW |
1471 | static size_t iommu_pgsize(struct iommu_domain *domain, |
1472 | unsigned long addr_merge, size_t size) | |
1473 | { | |
1474 | unsigned int pgsize_idx; | |
1475 | size_t pgsize; | |
1476 | ||
1477 | /* Max page size that still fits into 'size' */ | |
1478 | pgsize_idx = __fls(size); | |
1479 | ||
1480 | /* need to consider alignment requirements ? */ | |
1481 | if (likely(addr_merge)) { | |
1482 | /* Max page size allowed by address */ | |
1483 | unsigned int align_pgsize_idx = __ffs(addr_merge); | |
1484 | pgsize_idx = min(pgsize_idx, align_pgsize_idx); | |
1485 | } | |
1486 | ||
1487 | /* build a mask of acceptable page sizes */ | |
1488 | pgsize = (1UL << (pgsize_idx + 1)) - 1; | |
1489 | ||
1490 | /* throw away page sizes not supported by the hardware */ | |
d16e0faa | 1491 | pgsize &= domain->pgsize_bitmap; |
bd13969b AW |
1492 | |
1493 | /* make sure we're still sane */ | |
1494 | BUG_ON(!pgsize); | |
1495 | ||
1496 | /* pick the biggest page */ | |
1497 | pgsize_idx = __fls(pgsize); | |
1498 | pgsize = 1UL << pgsize_idx; | |
1499 | ||
1500 | return pgsize; | |
1501 | } | |
1502 | ||
cefc53c7 | 1503 | int iommu_map(struct iommu_domain *domain, unsigned long iova, |
7d3002cc | 1504 | phys_addr_t paddr, size_t size, int prot) |
cefc53c7 | 1505 | { |
7d3002cc OBC |
1506 | unsigned long orig_iova = iova; |
1507 | unsigned int min_pagesz; | |
1508 | size_t orig_size = size; | |
06bfcaa9 | 1509 | phys_addr_t orig_paddr = paddr; |
7d3002cc | 1510 | int ret = 0; |
cefc53c7 | 1511 | |
9db4ad91 | 1512 | if (unlikely(domain->ops->map == NULL || |
d16e0faa | 1513 | domain->pgsize_bitmap == 0UL)) |
e5aa7f00 | 1514 | return -ENODEV; |
cefc53c7 | 1515 | |
a10315e5 JR |
1516 | if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING))) |
1517 | return -EINVAL; | |
1518 | ||
7d3002cc | 1519 | /* find out the minimum page size supported */ |
d16e0faa | 1520 | min_pagesz = 1 << __ffs(domain->pgsize_bitmap); |
7d3002cc OBC |
1521 | |
1522 | /* | |
1523 | * both the virtual address and the physical one, as well as | |
1524 | * the size of the mapping, must be aligned (at least) to the | |
1525 | * size of the smallest page supported by the hardware | |
1526 | */ | |
1527 | if (!IS_ALIGNED(iova | paddr | size, min_pagesz)) { | |
abedb049 | 1528 | pr_err("unaligned: iova 0x%lx pa %pa size 0x%zx min_pagesz 0x%x\n", |
6197ca82 | 1529 | iova, &paddr, size, min_pagesz); |
7d3002cc OBC |
1530 | return -EINVAL; |
1531 | } | |
1532 | ||
abedb049 | 1533 | pr_debug("map: iova 0x%lx pa %pa size 0x%zx\n", iova, &paddr, size); |
7d3002cc OBC |
1534 | |
1535 | while (size) { | |
bd13969b | 1536 | size_t pgsize = iommu_pgsize(domain, iova | paddr, size); |
7d3002cc | 1537 | |
abedb049 | 1538 | pr_debug("mapping: iova 0x%lx pa %pa pgsize 0x%zx\n", |
6197ca82 | 1539 | iova, &paddr, pgsize); |
7d3002cc OBC |
1540 | |
1541 | ret = domain->ops->map(domain, iova, paddr, pgsize, prot); | |
1542 | if (ret) | |
1543 | break; | |
1544 | ||
1545 | iova += pgsize; | |
1546 | paddr += pgsize; | |
1547 | size -= pgsize; | |
1548 | } | |
1549 | ||
1550 | /* unroll mapping in case something went wrong */ | |
1551 | if (ret) | |
1552 | iommu_unmap(domain, orig_iova, orig_size - size); | |
e0be7c86 | 1553 | else |
06bfcaa9 | 1554 | trace_map(orig_iova, orig_paddr, orig_size); |
7d3002cc OBC |
1555 | |
1556 | return ret; | |
cefc53c7 JR |
1557 | } |
1558 | EXPORT_SYMBOL_GPL(iommu_map); | |
1559 | ||
add02cfd JR |
1560 | static size_t __iommu_unmap(struct iommu_domain *domain, |
1561 | unsigned long iova, size_t size, | |
1562 | bool sync) | |
cefc53c7 | 1563 | { |
add02cfd | 1564 | const struct iommu_ops *ops = domain->ops; |
7d3002cc | 1565 | size_t unmapped_page, unmapped = 0; |
6fd492fd | 1566 | unsigned long orig_iova = iova; |
add02cfd | 1567 | unsigned int min_pagesz; |
cefc53c7 | 1568 | |
add02cfd | 1569 | if (unlikely(ops->unmap == NULL || |
d16e0faa | 1570 | domain->pgsize_bitmap == 0UL)) |
e5aa7f00 JR |
1571 | return -ENODEV; |
1572 | ||
a10315e5 JR |
1573 | if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING))) |
1574 | return -EINVAL; | |
1575 | ||
7d3002cc | 1576 | /* find out the minimum page size supported */ |
d16e0faa | 1577 | min_pagesz = 1 << __ffs(domain->pgsize_bitmap); |
7d3002cc OBC |
1578 | |
1579 | /* | |
1580 | * The virtual address, as well as the size of the mapping, must be | |
1581 | * aligned (at least) to the size of the smallest page supported | |
1582 | * by the hardware | |
1583 | */ | |
1584 | if (!IS_ALIGNED(iova | size, min_pagesz)) { | |
6197ca82 JP |
1585 | pr_err("unaligned: iova 0x%lx size 0x%zx min_pagesz 0x%x\n", |
1586 | iova, size, min_pagesz); | |
7d3002cc OBC |
1587 | return -EINVAL; |
1588 | } | |
1589 | ||
6197ca82 | 1590 | pr_debug("unmap this: iova 0x%lx size 0x%zx\n", iova, size); |
7d3002cc OBC |
1591 | |
1592 | /* | |
1593 | * Keep iterating until we either unmap 'size' bytes (or more) | |
1594 | * or we hit an area that isn't mapped. | |
1595 | */ | |
1596 | while (unmapped < size) { | |
bd13969b | 1597 | size_t pgsize = iommu_pgsize(domain, iova, size - unmapped); |
7d3002cc | 1598 | |
add02cfd | 1599 | unmapped_page = ops->unmap(domain, iova, pgsize); |
7d3002cc OBC |
1600 | if (!unmapped_page) |
1601 | break; | |
1602 | ||
add02cfd JR |
1603 | if (sync && ops->iotlb_range_add) |
1604 | ops->iotlb_range_add(domain, iova, pgsize); | |
1605 | ||
6197ca82 JP |
1606 | pr_debug("unmapped: iova 0x%lx size 0x%zx\n", |
1607 | iova, unmapped_page); | |
7d3002cc OBC |
1608 | |
1609 | iova += unmapped_page; | |
1610 | unmapped += unmapped_page; | |
1611 | } | |
1612 | ||
add02cfd JR |
1613 | if (sync && ops->iotlb_sync) |
1614 | ops->iotlb_sync(domain); | |
1615 | ||
db8614d3 | 1616 | trace_unmap(orig_iova, size, unmapped); |
7d3002cc | 1617 | return unmapped; |
cefc53c7 | 1618 | } |
add02cfd JR |
1619 | |
1620 | size_t iommu_unmap(struct iommu_domain *domain, | |
1621 | unsigned long iova, size_t size) | |
1622 | { | |
1623 | return __iommu_unmap(domain, iova, size, true); | |
1624 | } | |
cefc53c7 | 1625 | EXPORT_SYMBOL_GPL(iommu_unmap); |
1460432c | 1626 | |
add02cfd JR |
1627 | size_t iommu_unmap_fast(struct iommu_domain *domain, |
1628 | unsigned long iova, size_t size) | |
1629 | { | |
1630 | return __iommu_unmap(domain, iova, size, false); | |
1631 | } | |
1632 | EXPORT_SYMBOL_GPL(iommu_unmap_fast); | |
1633 | ||
315786eb OH |
1634 | size_t default_iommu_map_sg(struct iommu_domain *domain, unsigned long iova, |
1635 | struct scatterlist *sg, unsigned int nents, int prot) | |
1636 | { | |
38ec010d | 1637 | struct scatterlist *s; |
315786eb | 1638 | size_t mapped = 0; |
18f23409 | 1639 | unsigned int i, min_pagesz; |
38ec010d | 1640 | int ret; |
315786eb | 1641 | |
d16e0faa | 1642 | if (unlikely(domain->pgsize_bitmap == 0UL)) |
18f23409 | 1643 | return 0; |
315786eb | 1644 | |
d16e0faa | 1645 | min_pagesz = 1 << __ffs(domain->pgsize_bitmap); |
18f23409 RM |
1646 | |
1647 | for_each_sg(sg, s, nents, i) { | |
3e6110fd | 1648 | phys_addr_t phys = page_to_phys(sg_page(s)) + s->offset; |
18f23409 RM |
1649 | |
1650 | /* | |
1651 | * We are mapping on IOMMU page boundaries, so offset within | |
1652 | * the page must be 0. However, the IOMMU may support pages | |
1653 | * smaller than PAGE_SIZE, so s->offset may still represent | |
1654 | * an offset of that boundary within the CPU page. | |
1655 | */ | |
1656 | if (!IS_ALIGNED(s->offset, min_pagesz)) | |
38ec010d JR |
1657 | goto out_err; |
1658 | ||
1659 | ret = iommu_map(domain, iova + mapped, phys, s->length, prot); | |
1660 | if (ret) | |
1661 | goto out_err; | |
1662 | ||
1663 | mapped += s->length; | |
315786eb OH |
1664 | } |
1665 | ||
1666 | return mapped; | |
38ec010d JR |
1667 | |
1668 | out_err: | |
1669 | /* undo mappings already done */ | |
1670 | iommu_unmap(domain, iova, mapped); | |
1671 | ||
1672 | return 0; | |
1673 | ||
315786eb OH |
1674 | } |
1675 | EXPORT_SYMBOL_GPL(default_iommu_map_sg); | |
d7787d57 JR |
1676 | |
1677 | int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr, | |
80f97f0f | 1678 | phys_addr_t paddr, u64 size, int prot) |
d7787d57 JR |
1679 | { |
1680 | if (unlikely(domain->ops->domain_window_enable == NULL)) | |
1681 | return -ENODEV; | |
1682 | ||
80f97f0f VS |
1683 | return domain->ops->domain_window_enable(domain, wnd_nr, paddr, size, |
1684 | prot); | |
d7787d57 JR |
1685 | } |
1686 | EXPORT_SYMBOL_GPL(iommu_domain_window_enable); | |
1687 | ||
1688 | void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr) | |
1689 | { | |
1690 | if (unlikely(domain->ops->domain_window_disable == NULL)) | |
1691 | return; | |
1692 | ||
1693 | return domain->ops->domain_window_disable(domain, wnd_nr); | |
1694 | } | |
1695 | EXPORT_SYMBOL_GPL(iommu_domain_window_disable); | |
1696 | ||
207c6e36 JR |
1697 | /** |
1698 | * report_iommu_fault() - report about an IOMMU fault to the IOMMU framework | |
1699 | * @domain: the iommu domain where the fault has happened | |
1700 | * @dev: the device where the fault has happened | |
1701 | * @iova: the faulting address | |
1702 | * @flags: mmu fault flags (e.g. IOMMU_FAULT_READ/IOMMU_FAULT_WRITE/...) | |
1703 | * | |
1704 | * This function should be called by the low-level IOMMU implementations | |
1705 | * whenever IOMMU faults happen, to allow high-level users, that are | |
1706 | * interested in such events, to know about them. | |
1707 | * | |
1708 | * This event may be useful for several possible use cases: | |
1709 | * - mere logging of the event | |
1710 | * - dynamic TLB/PTE loading | |
1711 | * - if restarting of the faulting device is required | |
1712 | * | |
1713 | * Returns 0 on success and an appropriate error code otherwise (if dynamic | |
1714 | * PTE/TLB loading will one day be supported, implementations will be able | |
1715 | * to tell whether it succeeded or not according to this return value). | |
1716 | * | |
1717 | * Specifically, -ENOSYS is returned if a fault handler isn't installed | |
1718 | * (though fault handlers can also return -ENOSYS, in case they want to | |
1719 | * elicit the default behavior of the IOMMU drivers). | |
1720 | */ | |
1721 | int report_iommu_fault(struct iommu_domain *domain, struct device *dev, | |
1722 | unsigned long iova, int flags) | |
1723 | { | |
1724 | int ret = -ENOSYS; | |
1725 | ||
1726 | /* | |
1727 | * if upper layers showed interest and installed a fault handler, | |
1728 | * invoke it. | |
1729 | */ | |
1730 | if (domain->handler) | |
1731 | ret = domain->handler(domain, dev, iova, flags, | |
1732 | domain->handler_token); | |
1733 | ||
1734 | trace_io_page_fault(dev, iova, flags); | |
1735 | return ret; | |
1736 | } | |
1737 | EXPORT_SYMBOL_GPL(report_iommu_fault); | |
1738 | ||
d72e31c9 | 1739 | static int __init iommu_init(void) |
1460432c | 1740 | { |
d72e31c9 AW |
1741 | iommu_group_kset = kset_create_and_add("iommu_groups", |
1742 | NULL, kernel_kobj); | |
d72e31c9 AW |
1743 | BUG_ON(!iommu_group_kset); |
1744 | ||
1745 | return 0; | |
1460432c | 1746 | } |
d7ef9995 | 1747 | core_initcall(iommu_init); |
0cd76dd1 JR |
1748 | |
1749 | int iommu_domain_get_attr(struct iommu_domain *domain, | |
1750 | enum iommu_attr attr, void *data) | |
1751 | { | |
0ff64f80 | 1752 | struct iommu_domain_geometry *geometry; |
d2e12160 | 1753 | bool *paging; |
0ff64f80 | 1754 | int ret = 0; |
69356712 | 1755 | u32 *count; |
0ff64f80 JR |
1756 | |
1757 | switch (attr) { | |
1758 | case DOMAIN_ATTR_GEOMETRY: | |
1759 | geometry = data; | |
1760 | *geometry = domain->geometry; | |
1761 | ||
d2e12160 JR |
1762 | break; |
1763 | case DOMAIN_ATTR_PAGING: | |
1764 | paging = data; | |
d16e0faa | 1765 | *paging = (domain->pgsize_bitmap != 0UL); |
69356712 JR |
1766 | break; |
1767 | case DOMAIN_ATTR_WINDOWS: | |
1768 | count = data; | |
1769 | ||
1770 | if (domain->ops->domain_get_windows != NULL) | |
1771 | *count = domain->ops->domain_get_windows(domain); | |
1772 | else | |
1773 | ret = -ENODEV; | |
1774 | ||
0ff64f80 JR |
1775 | break; |
1776 | default: | |
1777 | if (!domain->ops->domain_get_attr) | |
1778 | return -EINVAL; | |
0cd76dd1 | 1779 | |
0ff64f80 JR |
1780 | ret = domain->ops->domain_get_attr(domain, attr, data); |
1781 | } | |
1782 | ||
1783 | return ret; | |
0cd76dd1 JR |
1784 | } |
1785 | EXPORT_SYMBOL_GPL(iommu_domain_get_attr); | |
1786 | ||
1787 | int iommu_domain_set_attr(struct iommu_domain *domain, | |
1788 | enum iommu_attr attr, void *data) | |
1789 | { | |
69356712 JR |
1790 | int ret = 0; |
1791 | u32 *count; | |
1792 | ||
1793 | switch (attr) { | |
1794 | case DOMAIN_ATTR_WINDOWS: | |
1795 | count = data; | |
1796 | ||
1797 | if (domain->ops->domain_set_windows != NULL) | |
1798 | ret = domain->ops->domain_set_windows(domain, *count); | |
1799 | else | |
1800 | ret = -ENODEV; | |
1460432c | 1801 | |
69356712 JR |
1802 | break; |
1803 | default: | |
1804 | if (domain->ops->domain_set_attr == NULL) | |
1805 | return -EINVAL; | |
1806 | ||
1807 | ret = domain->ops->domain_set_attr(domain, attr, data); | |
1808 | } | |
1809 | ||
1810 | return ret; | |
1460432c | 1811 | } |
0cd76dd1 | 1812 | EXPORT_SYMBOL_GPL(iommu_domain_set_attr); |
a1015c2b | 1813 | |
e5b5234a | 1814 | void iommu_get_resv_regions(struct device *dev, struct list_head *list) |
a1015c2b JR |
1815 | { |
1816 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
1817 | ||
e5b5234a EA |
1818 | if (ops && ops->get_resv_regions) |
1819 | ops->get_resv_regions(dev, list); | |
a1015c2b JR |
1820 | } |
1821 | ||
e5b5234a | 1822 | void iommu_put_resv_regions(struct device *dev, struct list_head *list) |
a1015c2b JR |
1823 | { |
1824 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
1825 | ||
e5b5234a EA |
1826 | if (ops && ops->put_resv_regions) |
1827 | ops->put_resv_regions(dev, list); | |
a1015c2b | 1828 | } |
d290f1e7 | 1829 | |
2b20cbba | 1830 | struct iommu_resv_region *iommu_alloc_resv_region(phys_addr_t start, |
9d3a4de4 RM |
1831 | size_t length, int prot, |
1832 | enum iommu_resv_type type) | |
2b20cbba EA |
1833 | { |
1834 | struct iommu_resv_region *region; | |
1835 | ||
1836 | region = kzalloc(sizeof(*region), GFP_KERNEL); | |
1837 | if (!region) | |
1838 | return NULL; | |
1839 | ||
1840 | INIT_LIST_HEAD(®ion->list); | |
1841 | region->start = start; | |
1842 | region->length = length; | |
1843 | region->prot = prot; | |
1844 | region->type = type; | |
1845 | return region; | |
a1015c2b | 1846 | } |
d290f1e7 JR |
1847 | |
1848 | /* Request that a device is direct mapped by the IOMMU */ | |
1849 | int iommu_request_dm_for_dev(struct device *dev) | |
1850 | { | |
1851 | struct iommu_domain *dm_domain; | |
1852 | struct iommu_group *group; | |
1853 | int ret; | |
1854 | ||
1855 | /* Device must already be in a group before calling this function */ | |
1856 | group = iommu_group_get_for_dev(dev); | |
409e553d DC |
1857 | if (IS_ERR(group)) |
1858 | return PTR_ERR(group); | |
d290f1e7 JR |
1859 | |
1860 | mutex_lock(&group->mutex); | |
1861 | ||
1862 | /* Check if the default domain is already direct mapped */ | |
1863 | ret = 0; | |
1864 | if (group->default_domain && | |
1865 | group->default_domain->type == IOMMU_DOMAIN_IDENTITY) | |
1866 | goto out; | |
1867 | ||
1868 | /* Don't change mappings of existing devices */ | |
1869 | ret = -EBUSY; | |
1870 | if (iommu_group_device_count(group) != 1) | |
1871 | goto out; | |
1872 | ||
1873 | /* Allocate a direct mapped domain */ | |
1874 | ret = -ENOMEM; | |
1875 | dm_domain = __iommu_domain_alloc(dev->bus, IOMMU_DOMAIN_IDENTITY); | |
1876 | if (!dm_domain) | |
1877 | goto out; | |
1878 | ||
1879 | /* Attach the device to the domain */ | |
1880 | ret = __iommu_attach_group(dm_domain, group); | |
1881 | if (ret) { | |
1882 | iommu_domain_free(dm_domain); | |
1883 | goto out; | |
1884 | } | |
1885 | ||
1886 | /* Make the direct mapped domain the default for this group */ | |
1887 | if (group->default_domain) | |
1888 | iommu_domain_free(group->default_domain); | |
1889 | group->default_domain = dm_domain; | |
1890 | ||
1891 | pr_info("Using direct mapping for device %s\n", dev_name(dev)); | |
1892 | ||
1893 | ret = 0; | |
1894 | out: | |
1895 | mutex_unlock(&group->mutex); | |
1896 | iommu_group_put(group); | |
1897 | ||
1898 | return ret; | |
1899 | } | |
57f98d2f | 1900 | |
534766df | 1901 | const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode) |
e4f10ffe | 1902 | { |
e4f10ffe | 1903 | const struct iommu_ops *ops = NULL; |
d0f6f583 | 1904 | struct iommu_device *iommu; |
e4f10ffe | 1905 | |
d0f6f583 JR |
1906 | spin_lock(&iommu_device_lock); |
1907 | list_for_each_entry(iommu, &iommu_device_list, list) | |
1908 | if (iommu->fwnode == fwnode) { | |
1909 | ops = iommu->ops; | |
e4f10ffe LP |
1910 | break; |
1911 | } | |
d0f6f583 | 1912 | spin_unlock(&iommu_device_lock); |
e4f10ffe LP |
1913 | return ops; |
1914 | } | |
1915 | ||
57f98d2f RM |
1916 | int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode, |
1917 | const struct iommu_ops *ops) | |
1918 | { | |
1919 | struct iommu_fwspec *fwspec = dev->iommu_fwspec; | |
1920 | ||
1921 | if (fwspec) | |
1922 | return ops == fwspec->ops ? 0 : -EINVAL; | |
1923 | ||
1924 | fwspec = kzalloc(sizeof(*fwspec), GFP_KERNEL); | |
1925 | if (!fwspec) | |
1926 | return -ENOMEM; | |
1927 | ||
1928 | of_node_get(to_of_node(iommu_fwnode)); | |
1929 | fwspec->iommu_fwnode = iommu_fwnode; | |
1930 | fwspec->ops = ops; | |
1931 | dev->iommu_fwspec = fwspec; | |
1932 | return 0; | |
1933 | } | |
1934 | EXPORT_SYMBOL_GPL(iommu_fwspec_init); | |
1935 | ||
1936 | void iommu_fwspec_free(struct device *dev) | |
1937 | { | |
1938 | struct iommu_fwspec *fwspec = dev->iommu_fwspec; | |
1939 | ||
1940 | if (fwspec) { | |
1941 | fwnode_handle_put(fwspec->iommu_fwnode); | |
1942 | kfree(fwspec); | |
1943 | dev->iommu_fwspec = NULL; | |
1944 | } | |
1945 | } | |
1946 | EXPORT_SYMBOL_GPL(iommu_fwspec_free); | |
1947 | ||
1948 | int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids) | |
1949 | { | |
1950 | struct iommu_fwspec *fwspec = dev->iommu_fwspec; | |
1951 | size_t size; | |
1952 | int i; | |
1953 | ||
1954 | if (!fwspec) | |
1955 | return -EINVAL; | |
1956 | ||
1957 | size = offsetof(struct iommu_fwspec, ids[fwspec->num_ids + num_ids]); | |
1958 | if (size > sizeof(*fwspec)) { | |
1959 | fwspec = krealloc(dev->iommu_fwspec, size, GFP_KERNEL); | |
1960 | if (!fwspec) | |
1961 | return -ENOMEM; | |
909111ba ZL |
1962 | |
1963 | dev->iommu_fwspec = fwspec; | |
57f98d2f RM |
1964 | } |
1965 | ||
1966 | for (i = 0; i < num_ids; i++) | |
1967 | fwspec->ids[fwspec->num_ids + i] = ids[i]; | |
1968 | ||
1969 | fwspec->num_ids += num_ids; | |
57f98d2f RM |
1970 | return 0; |
1971 | } | |
1972 | EXPORT_SYMBOL_GPL(iommu_fwspec_add_ids); |