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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); |
58d11317 OJ |
39 | #ifdef CONFIG_IOMMU_DEFAULT_PASSTHROUGH |
40 | static unsigned int iommu_def_domain_type = IOMMU_DOMAIN_IDENTITY; | |
41 | #else | |
fccb4e3b | 42 | static unsigned int iommu_def_domain_type = IOMMU_DOMAIN_DMA; |
58d11317 | 43 | #endif |
d72e31c9 | 44 | |
b22f6434 TR |
45 | struct iommu_callback_data { |
46 | const struct iommu_ops *ops; | |
47 | }; | |
48 | ||
d72e31c9 AW |
49 | struct iommu_group { |
50 | struct kobject kobj; | |
51 | struct kobject *devices_kobj; | |
52 | struct list_head devices; | |
53 | struct mutex mutex; | |
54 | struct blocking_notifier_head notifier; | |
55 | void *iommu_data; | |
56 | void (*iommu_data_release)(void *iommu_data); | |
57 | char *name; | |
58 | int id; | |
53723dc5 | 59 | struct iommu_domain *default_domain; |
e39cb8a3 | 60 | struct iommu_domain *domain; |
d72e31c9 AW |
61 | }; |
62 | ||
c09e22d5 | 63 | struct group_device { |
d72e31c9 AW |
64 | struct list_head list; |
65 | struct device *dev; | |
66 | char *name; | |
67 | }; | |
68 | ||
69 | struct iommu_group_attribute { | |
70 | struct attribute attr; | |
71 | ssize_t (*show)(struct iommu_group *group, char *buf); | |
72 | ssize_t (*store)(struct iommu_group *group, | |
73 | const char *buf, size_t count); | |
74 | }; | |
75 | ||
bc7d12b9 EA |
76 | static const char * const iommu_group_resv_type_string[] = { |
77 | [IOMMU_RESV_DIRECT] = "direct", | |
78 | [IOMMU_RESV_RESERVED] = "reserved", | |
79 | [IOMMU_RESV_MSI] = "msi", | |
9d3a4de4 | 80 | [IOMMU_RESV_SW_MSI] = "msi", |
bc7d12b9 EA |
81 | }; |
82 | ||
d72e31c9 AW |
83 | #define IOMMU_GROUP_ATTR(_name, _mode, _show, _store) \ |
84 | struct iommu_group_attribute iommu_group_attr_##_name = \ | |
85 | __ATTR(_name, _mode, _show, _store) | |
fc2100eb | 86 | |
d72e31c9 AW |
87 | #define to_iommu_group_attr(_attr) \ |
88 | container_of(_attr, struct iommu_group_attribute, attr) | |
89 | #define to_iommu_group(_kobj) \ | |
90 | container_of(_kobj, struct iommu_group, kobj) | |
fc2100eb | 91 | |
b0119e87 JR |
92 | static LIST_HEAD(iommu_device_list); |
93 | static DEFINE_SPINLOCK(iommu_device_lock); | |
94 | ||
95 | int iommu_device_register(struct iommu_device *iommu) | |
96 | { | |
97 | spin_lock(&iommu_device_lock); | |
98 | list_add_tail(&iommu->list, &iommu_device_list); | |
99 | spin_unlock(&iommu_device_lock); | |
100 | ||
101 | return 0; | |
102 | } | |
103 | ||
104 | void iommu_device_unregister(struct iommu_device *iommu) | |
105 | { | |
106 | spin_lock(&iommu_device_lock); | |
107 | list_del(&iommu->list); | |
108 | spin_unlock(&iommu_device_lock); | |
109 | } | |
110 | ||
53723dc5 JR |
111 | static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus, |
112 | unsigned type); | |
e39cb8a3 JR |
113 | static int __iommu_attach_device(struct iommu_domain *domain, |
114 | struct device *dev); | |
115 | static int __iommu_attach_group(struct iommu_domain *domain, | |
116 | struct iommu_group *group); | |
117 | static void __iommu_detach_group(struct iommu_domain *domain, | |
118 | struct iommu_group *group); | |
53723dc5 | 119 | |
fccb4e3b WD |
120 | static int __init iommu_set_def_domain_type(char *str) |
121 | { | |
122 | bool pt; | |
7f9584df | 123 | int ret; |
fccb4e3b | 124 | |
7f9584df AS |
125 | ret = kstrtobool(str, &pt); |
126 | if (ret) | |
127 | return ret; | |
fccb4e3b WD |
128 | |
129 | iommu_def_domain_type = pt ? IOMMU_DOMAIN_IDENTITY : IOMMU_DOMAIN_DMA; | |
130 | return 0; | |
131 | } | |
132 | early_param("iommu.passthrough", iommu_set_def_domain_type); | |
133 | ||
d72e31c9 AW |
134 | static ssize_t iommu_group_attr_show(struct kobject *kobj, |
135 | struct attribute *__attr, char *buf) | |
1460432c | 136 | { |
d72e31c9 AW |
137 | struct iommu_group_attribute *attr = to_iommu_group_attr(__attr); |
138 | struct iommu_group *group = to_iommu_group(kobj); | |
139 | ssize_t ret = -EIO; | |
1460432c | 140 | |
d72e31c9 AW |
141 | if (attr->show) |
142 | ret = attr->show(group, buf); | |
143 | return ret; | |
144 | } | |
145 | ||
146 | static ssize_t iommu_group_attr_store(struct kobject *kobj, | |
147 | struct attribute *__attr, | |
148 | const char *buf, size_t count) | |
149 | { | |
150 | struct iommu_group_attribute *attr = to_iommu_group_attr(__attr); | |
151 | struct iommu_group *group = to_iommu_group(kobj); | |
152 | ssize_t ret = -EIO; | |
1460432c | 153 | |
d72e31c9 AW |
154 | if (attr->store) |
155 | ret = attr->store(group, buf, count); | |
156 | return ret; | |
1460432c | 157 | } |
1460432c | 158 | |
d72e31c9 AW |
159 | static const struct sysfs_ops iommu_group_sysfs_ops = { |
160 | .show = iommu_group_attr_show, | |
161 | .store = iommu_group_attr_store, | |
162 | }; | |
1460432c | 163 | |
d72e31c9 AW |
164 | static int iommu_group_create_file(struct iommu_group *group, |
165 | struct iommu_group_attribute *attr) | |
166 | { | |
167 | return sysfs_create_file(&group->kobj, &attr->attr); | |
1460432c | 168 | } |
1460432c | 169 | |
d72e31c9 AW |
170 | static void iommu_group_remove_file(struct iommu_group *group, |
171 | struct iommu_group_attribute *attr) | |
172 | { | |
173 | sysfs_remove_file(&group->kobj, &attr->attr); | |
174 | } | |
175 | ||
176 | static ssize_t iommu_group_show_name(struct iommu_group *group, char *buf) | |
177 | { | |
178 | return sprintf(buf, "%s\n", group->name); | |
179 | } | |
180 | ||
6c65fb31 EA |
181 | /** |
182 | * iommu_insert_resv_region - Insert a new region in the | |
183 | * list of reserved regions. | |
184 | * @new: new region to insert | |
185 | * @regions: list of regions | |
186 | * | |
187 | * The new element is sorted by address with respect to the other | |
188 | * regions of the same type. In case it overlaps with another | |
189 | * region of the same type, regions are merged. In case it | |
190 | * overlaps with another region of different type, regions are | |
191 | * not merged. | |
192 | */ | |
193 | static int iommu_insert_resv_region(struct iommu_resv_region *new, | |
194 | struct list_head *regions) | |
195 | { | |
196 | struct iommu_resv_region *region; | |
197 | phys_addr_t start = new->start; | |
198 | phys_addr_t end = new->start + new->length - 1; | |
199 | struct list_head *pos = regions->next; | |
200 | ||
201 | while (pos != regions) { | |
202 | struct iommu_resv_region *entry = | |
203 | list_entry(pos, struct iommu_resv_region, list); | |
204 | phys_addr_t a = entry->start; | |
205 | phys_addr_t b = entry->start + entry->length - 1; | |
206 | int type = entry->type; | |
207 | ||
208 | if (end < a) { | |
209 | goto insert; | |
210 | } else if (start > b) { | |
211 | pos = pos->next; | |
212 | } else if ((start >= a) && (end <= b)) { | |
213 | if (new->type == type) | |
214 | goto done; | |
215 | else | |
216 | pos = pos->next; | |
217 | } else { | |
218 | if (new->type == type) { | |
219 | phys_addr_t new_start = min(a, start); | |
220 | phys_addr_t new_end = max(b, end); | |
221 | ||
222 | list_del(&entry->list); | |
223 | entry->start = new_start; | |
224 | entry->length = new_end - new_start + 1; | |
225 | iommu_insert_resv_region(entry, regions); | |
226 | } else { | |
227 | pos = pos->next; | |
228 | } | |
229 | } | |
230 | } | |
231 | insert: | |
232 | region = iommu_alloc_resv_region(new->start, new->length, | |
233 | new->prot, new->type); | |
234 | if (!region) | |
235 | return -ENOMEM; | |
236 | ||
237 | list_add_tail(®ion->list, pos); | |
238 | done: | |
239 | return 0; | |
240 | } | |
241 | ||
242 | static int | |
243 | iommu_insert_device_resv_regions(struct list_head *dev_resv_regions, | |
244 | struct list_head *group_resv_regions) | |
245 | { | |
246 | struct iommu_resv_region *entry; | |
a514a6e2 | 247 | int ret = 0; |
6c65fb31 EA |
248 | |
249 | list_for_each_entry(entry, dev_resv_regions, list) { | |
250 | ret = iommu_insert_resv_region(entry, group_resv_regions); | |
251 | if (ret) | |
252 | break; | |
253 | } | |
254 | return ret; | |
255 | } | |
256 | ||
257 | int iommu_get_group_resv_regions(struct iommu_group *group, | |
258 | struct list_head *head) | |
259 | { | |
8d2932dd | 260 | struct group_device *device; |
6c65fb31 EA |
261 | int ret = 0; |
262 | ||
263 | mutex_lock(&group->mutex); | |
264 | list_for_each_entry(device, &group->devices, list) { | |
265 | struct list_head dev_resv_regions; | |
266 | ||
267 | INIT_LIST_HEAD(&dev_resv_regions); | |
268 | iommu_get_resv_regions(device->dev, &dev_resv_regions); | |
269 | ret = iommu_insert_device_resv_regions(&dev_resv_regions, head); | |
270 | iommu_put_resv_regions(device->dev, &dev_resv_regions); | |
271 | if (ret) | |
272 | break; | |
273 | } | |
274 | mutex_unlock(&group->mutex); | |
275 | return ret; | |
276 | } | |
277 | EXPORT_SYMBOL_GPL(iommu_get_group_resv_regions); | |
278 | ||
bc7d12b9 EA |
279 | static ssize_t iommu_group_show_resv_regions(struct iommu_group *group, |
280 | char *buf) | |
281 | { | |
282 | struct iommu_resv_region *region, *next; | |
283 | struct list_head group_resv_regions; | |
284 | char *str = buf; | |
285 | ||
286 | INIT_LIST_HEAD(&group_resv_regions); | |
287 | iommu_get_group_resv_regions(group, &group_resv_regions); | |
288 | ||
289 | list_for_each_entry_safe(region, next, &group_resv_regions, list) { | |
290 | str += sprintf(str, "0x%016llx 0x%016llx %s\n", | |
291 | (long long int)region->start, | |
292 | (long long int)(region->start + | |
293 | region->length - 1), | |
294 | iommu_group_resv_type_string[region->type]); | |
295 | kfree(region); | |
296 | } | |
297 | ||
298 | return (str - buf); | |
299 | } | |
300 | ||
c52c72d3 OJ |
301 | static ssize_t iommu_group_show_type(struct iommu_group *group, |
302 | char *buf) | |
303 | { | |
304 | char *type = "unknown\n"; | |
305 | ||
306 | if (group->default_domain) { | |
307 | switch (group->default_domain->type) { | |
308 | case IOMMU_DOMAIN_BLOCKED: | |
309 | type = "blocked\n"; | |
310 | break; | |
311 | case IOMMU_DOMAIN_IDENTITY: | |
312 | type = "identity\n"; | |
313 | break; | |
314 | case IOMMU_DOMAIN_UNMANAGED: | |
315 | type = "unmanaged\n"; | |
316 | break; | |
317 | case IOMMU_DOMAIN_DMA: | |
318 | type = "DMA"; | |
319 | break; | |
320 | } | |
321 | } | |
322 | strcpy(buf, type); | |
323 | ||
324 | return strlen(type); | |
325 | } | |
326 | ||
d72e31c9 AW |
327 | static IOMMU_GROUP_ATTR(name, S_IRUGO, iommu_group_show_name, NULL); |
328 | ||
bc7d12b9 EA |
329 | static IOMMU_GROUP_ATTR(reserved_regions, 0444, |
330 | iommu_group_show_resv_regions, NULL); | |
331 | ||
c52c72d3 OJ |
332 | static IOMMU_GROUP_ATTR(type, 0444, iommu_group_show_type, NULL); |
333 | ||
d72e31c9 AW |
334 | static void iommu_group_release(struct kobject *kobj) |
335 | { | |
336 | struct iommu_group *group = to_iommu_group(kobj); | |
337 | ||
269aa808 JR |
338 | pr_debug("Releasing group %d\n", group->id); |
339 | ||
d72e31c9 AW |
340 | if (group->iommu_data_release) |
341 | group->iommu_data_release(group->iommu_data); | |
342 | ||
feccf398 | 343 | ida_simple_remove(&iommu_group_ida, group->id); |
d72e31c9 | 344 | |
53723dc5 JR |
345 | if (group->default_domain) |
346 | iommu_domain_free(group->default_domain); | |
347 | ||
d72e31c9 AW |
348 | kfree(group->name); |
349 | kfree(group); | |
350 | } | |
351 | ||
352 | static struct kobj_type iommu_group_ktype = { | |
353 | .sysfs_ops = &iommu_group_sysfs_ops, | |
354 | .release = iommu_group_release, | |
355 | }; | |
356 | ||
357 | /** | |
358 | * iommu_group_alloc - Allocate a new group | |
d72e31c9 AW |
359 | * |
360 | * This function is called by an iommu driver to allocate a new iommu | |
361 | * group. The iommu group represents the minimum granularity of the iommu. | |
362 | * Upon successful return, the caller holds a reference to the supplied | |
363 | * group in order to hold the group until devices are added. Use | |
364 | * iommu_group_put() to release this extra reference count, allowing the | |
365 | * group to be automatically reclaimed once it has no devices or external | |
366 | * references. | |
367 | */ | |
368 | struct iommu_group *iommu_group_alloc(void) | |
1460432c | 369 | { |
d72e31c9 AW |
370 | struct iommu_group *group; |
371 | int ret; | |
372 | ||
373 | group = kzalloc(sizeof(*group), GFP_KERNEL); | |
374 | if (!group) | |
375 | return ERR_PTR(-ENOMEM); | |
376 | ||
377 | group->kobj.kset = iommu_group_kset; | |
378 | mutex_init(&group->mutex); | |
379 | INIT_LIST_HEAD(&group->devices); | |
380 | BLOCKING_INIT_NOTIFIER_HEAD(&group->notifier); | |
381 | ||
feccf398 HK |
382 | ret = ida_simple_get(&iommu_group_ida, 0, 0, GFP_KERNEL); |
383 | if (ret < 0) { | |
d72e31c9 | 384 | kfree(group); |
feccf398 | 385 | return ERR_PTR(ret); |
d72e31c9 | 386 | } |
feccf398 | 387 | group->id = ret; |
1460432c | 388 | |
d72e31c9 AW |
389 | ret = kobject_init_and_add(&group->kobj, &iommu_group_ktype, |
390 | NULL, "%d", group->id); | |
391 | if (ret) { | |
feccf398 | 392 | ida_simple_remove(&iommu_group_ida, group->id); |
d72e31c9 AW |
393 | kfree(group); |
394 | return ERR_PTR(ret); | |
395 | } | |
396 | ||
397 | group->devices_kobj = kobject_create_and_add("devices", &group->kobj); | |
398 | if (!group->devices_kobj) { | |
399 | kobject_put(&group->kobj); /* triggers .release & free */ | |
400 | return ERR_PTR(-ENOMEM); | |
401 | } | |
402 | ||
403 | /* | |
404 | * The devices_kobj holds a reference on the group kobject, so | |
405 | * as long as that exists so will the group. We can therefore | |
406 | * use the devices_kobj for reference counting. | |
407 | */ | |
408 | kobject_put(&group->kobj); | |
409 | ||
bc7d12b9 EA |
410 | ret = iommu_group_create_file(group, |
411 | &iommu_group_attr_reserved_regions); | |
412 | if (ret) | |
413 | return ERR_PTR(ret); | |
414 | ||
c52c72d3 OJ |
415 | ret = iommu_group_create_file(group, &iommu_group_attr_type); |
416 | if (ret) | |
417 | return ERR_PTR(ret); | |
418 | ||
269aa808 JR |
419 | pr_debug("Allocated group %d\n", group->id); |
420 | ||
d72e31c9 AW |
421 | return group; |
422 | } | |
423 | EXPORT_SYMBOL_GPL(iommu_group_alloc); | |
424 | ||
aa16bea9 AK |
425 | struct iommu_group *iommu_group_get_by_id(int id) |
426 | { | |
427 | struct kobject *group_kobj; | |
428 | struct iommu_group *group; | |
429 | const char *name; | |
430 | ||
431 | if (!iommu_group_kset) | |
432 | return NULL; | |
433 | ||
434 | name = kasprintf(GFP_KERNEL, "%d", id); | |
435 | if (!name) | |
436 | return NULL; | |
437 | ||
438 | group_kobj = kset_find_obj(iommu_group_kset, name); | |
439 | kfree(name); | |
440 | ||
441 | if (!group_kobj) | |
442 | return NULL; | |
443 | ||
444 | group = container_of(group_kobj, struct iommu_group, kobj); | |
445 | BUG_ON(group->id != id); | |
446 | ||
447 | kobject_get(group->devices_kobj); | |
448 | kobject_put(&group->kobj); | |
449 | ||
450 | return group; | |
451 | } | |
452 | EXPORT_SYMBOL_GPL(iommu_group_get_by_id); | |
453 | ||
d72e31c9 AW |
454 | /** |
455 | * iommu_group_get_iommudata - retrieve iommu_data registered for a group | |
456 | * @group: the group | |
457 | * | |
458 | * iommu drivers can store data in the group for use when doing iommu | |
459 | * operations. This function provides a way to retrieve it. Caller | |
460 | * should hold a group reference. | |
461 | */ | |
462 | void *iommu_group_get_iommudata(struct iommu_group *group) | |
463 | { | |
464 | return group->iommu_data; | |
465 | } | |
466 | EXPORT_SYMBOL_GPL(iommu_group_get_iommudata); | |
467 | ||
468 | /** | |
469 | * iommu_group_set_iommudata - set iommu_data for a group | |
470 | * @group: the group | |
471 | * @iommu_data: new data | |
472 | * @release: release function for iommu_data | |
473 | * | |
474 | * iommu drivers can store data in the group for use when doing iommu | |
475 | * operations. This function provides a way to set the data after | |
476 | * the group has been allocated. Caller should hold a group reference. | |
477 | */ | |
478 | void iommu_group_set_iommudata(struct iommu_group *group, void *iommu_data, | |
479 | void (*release)(void *iommu_data)) | |
1460432c | 480 | { |
d72e31c9 AW |
481 | group->iommu_data = iommu_data; |
482 | group->iommu_data_release = release; | |
483 | } | |
484 | EXPORT_SYMBOL_GPL(iommu_group_set_iommudata); | |
1460432c | 485 | |
d72e31c9 AW |
486 | /** |
487 | * iommu_group_set_name - set name for a group | |
488 | * @group: the group | |
489 | * @name: name | |
490 | * | |
491 | * Allow iommu driver to set a name for a group. When set it will | |
492 | * appear in a name attribute file under the group in sysfs. | |
493 | */ | |
494 | int iommu_group_set_name(struct iommu_group *group, const char *name) | |
495 | { | |
496 | int ret; | |
497 | ||
498 | if (group->name) { | |
499 | iommu_group_remove_file(group, &iommu_group_attr_name); | |
500 | kfree(group->name); | |
501 | group->name = NULL; | |
502 | if (!name) | |
503 | return 0; | |
504 | } | |
505 | ||
506 | group->name = kstrdup(name, GFP_KERNEL); | |
507 | if (!group->name) | |
508 | return -ENOMEM; | |
509 | ||
510 | ret = iommu_group_create_file(group, &iommu_group_attr_name); | |
511 | if (ret) { | |
512 | kfree(group->name); | |
513 | group->name = NULL; | |
514 | return ret; | |
515 | } | |
1460432c AW |
516 | |
517 | return 0; | |
518 | } | |
d72e31c9 | 519 | EXPORT_SYMBOL_GPL(iommu_group_set_name); |
1460432c | 520 | |
beed2821 JR |
521 | static int iommu_group_create_direct_mappings(struct iommu_group *group, |
522 | struct device *dev) | |
523 | { | |
524 | struct iommu_domain *domain = group->default_domain; | |
e5b5234a | 525 | struct iommu_resv_region *entry; |
beed2821 JR |
526 | struct list_head mappings; |
527 | unsigned long pg_size; | |
528 | int ret = 0; | |
529 | ||
530 | if (!domain || domain->type != IOMMU_DOMAIN_DMA) | |
531 | return 0; | |
532 | ||
d16e0faa | 533 | BUG_ON(!domain->pgsize_bitmap); |
beed2821 | 534 | |
d16e0faa | 535 | pg_size = 1UL << __ffs(domain->pgsize_bitmap); |
beed2821 JR |
536 | INIT_LIST_HEAD(&mappings); |
537 | ||
e5b5234a | 538 | iommu_get_resv_regions(dev, &mappings); |
beed2821 JR |
539 | |
540 | /* We need to consider overlapping regions for different devices */ | |
541 | list_for_each_entry(entry, &mappings, list) { | |
542 | dma_addr_t start, end, addr; | |
543 | ||
e5b5234a EA |
544 | if (domain->ops->apply_resv_region) |
545 | domain->ops->apply_resv_region(dev, domain, entry); | |
33b21a6b | 546 | |
beed2821 JR |
547 | start = ALIGN(entry->start, pg_size); |
548 | end = ALIGN(entry->start + entry->length, pg_size); | |
549 | ||
544a25d9 EA |
550 | if (entry->type != IOMMU_RESV_DIRECT) |
551 | continue; | |
552 | ||
beed2821 JR |
553 | for (addr = start; addr < end; addr += pg_size) { |
554 | phys_addr_t phys_addr; | |
555 | ||
556 | phys_addr = iommu_iova_to_phys(domain, addr); | |
557 | if (phys_addr) | |
558 | continue; | |
559 | ||
560 | ret = iommu_map(domain, addr, addr, pg_size, entry->prot); | |
561 | if (ret) | |
562 | goto out; | |
563 | } | |
564 | ||
565 | } | |
566 | ||
add02cfd JR |
567 | iommu_flush_tlb_all(domain); |
568 | ||
beed2821 | 569 | out: |
e5b5234a | 570 | iommu_put_resv_regions(dev, &mappings); |
beed2821 JR |
571 | |
572 | return ret; | |
573 | } | |
574 | ||
d72e31c9 AW |
575 | /** |
576 | * iommu_group_add_device - add a device to an iommu group | |
577 | * @group: the group into which to add the device (reference should be held) | |
578 | * @dev: the device | |
579 | * | |
580 | * This function is called by an iommu driver to add a device into a | |
581 | * group. Adding a device increments the group reference count. | |
582 | */ | |
583 | int iommu_group_add_device(struct iommu_group *group, struct device *dev) | |
1460432c | 584 | { |
d72e31c9 | 585 | int ret, i = 0; |
c09e22d5 | 586 | struct group_device *device; |
d72e31c9 AW |
587 | |
588 | device = kzalloc(sizeof(*device), GFP_KERNEL); | |
589 | if (!device) | |
590 | return -ENOMEM; | |
591 | ||
592 | device->dev = dev; | |
1460432c | 593 | |
d72e31c9 | 594 | ret = sysfs_create_link(&dev->kobj, &group->kobj, "iommu_group"); |
797a8b4d RM |
595 | if (ret) |
596 | goto err_free_device; | |
d72e31c9 AW |
597 | |
598 | device->name = kasprintf(GFP_KERNEL, "%s", kobject_name(&dev->kobj)); | |
599 | rename: | |
600 | if (!device->name) { | |
797a8b4d RM |
601 | ret = -ENOMEM; |
602 | goto err_remove_link; | |
d72e31c9 | 603 | } |
1460432c | 604 | |
d72e31c9 AW |
605 | ret = sysfs_create_link_nowarn(group->devices_kobj, |
606 | &dev->kobj, device->name); | |
607 | if (ret) { | |
d72e31c9 AW |
608 | if (ret == -EEXIST && i >= 0) { |
609 | /* | |
610 | * Account for the slim chance of collision | |
611 | * and append an instance to the name. | |
612 | */ | |
797a8b4d | 613 | kfree(device->name); |
d72e31c9 AW |
614 | device->name = kasprintf(GFP_KERNEL, "%s.%d", |
615 | kobject_name(&dev->kobj), i++); | |
616 | goto rename; | |
617 | } | |
797a8b4d | 618 | goto err_free_name; |
d72e31c9 AW |
619 | } |
620 | ||
621 | kobject_get(group->devices_kobj); | |
622 | ||
623 | dev->iommu_group = group; | |
624 | ||
beed2821 JR |
625 | iommu_group_create_direct_mappings(group, dev); |
626 | ||
d72e31c9 AW |
627 | mutex_lock(&group->mutex); |
628 | list_add_tail(&device->list, &group->devices); | |
e39cb8a3 | 629 | if (group->domain) |
797a8b4d | 630 | ret = __iommu_attach_device(group->domain, dev); |
d72e31c9 | 631 | mutex_unlock(&group->mutex); |
797a8b4d RM |
632 | if (ret) |
633 | goto err_put_group; | |
d72e31c9 AW |
634 | |
635 | /* Notify any listeners about change to group. */ | |
636 | blocking_notifier_call_chain(&group->notifier, | |
637 | IOMMU_GROUP_NOTIFY_ADD_DEVICE, dev); | |
d1cf7e82 SK |
638 | |
639 | trace_add_device_to_group(group->id, dev); | |
269aa808 JR |
640 | |
641 | pr_info("Adding device %s to group %d\n", dev_name(dev), group->id); | |
642 | ||
1460432c | 643 | return 0; |
797a8b4d RM |
644 | |
645 | err_put_group: | |
646 | mutex_lock(&group->mutex); | |
647 | list_del(&device->list); | |
648 | mutex_unlock(&group->mutex); | |
649 | dev->iommu_group = NULL; | |
650 | kobject_put(group->devices_kobj); | |
651 | err_free_name: | |
652 | kfree(device->name); | |
653 | err_remove_link: | |
654 | sysfs_remove_link(&dev->kobj, "iommu_group"); | |
655 | err_free_device: | |
656 | kfree(device); | |
657 | pr_err("Failed to add device %s to group %d: %d\n", dev_name(dev), group->id, ret); | |
658 | return ret; | |
1460432c | 659 | } |
d72e31c9 | 660 | EXPORT_SYMBOL_GPL(iommu_group_add_device); |
1460432c | 661 | |
d72e31c9 AW |
662 | /** |
663 | * iommu_group_remove_device - remove a device from it's current group | |
664 | * @dev: device to be removed | |
665 | * | |
666 | * This function is called by an iommu driver to remove the device from | |
667 | * it's current group. This decrements the iommu group reference count. | |
668 | */ | |
669 | void iommu_group_remove_device(struct device *dev) | |
670 | { | |
671 | struct iommu_group *group = dev->iommu_group; | |
c09e22d5 | 672 | struct group_device *tmp_device, *device = NULL; |
d72e31c9 | 673 | |
269aa808 JR |
674 | pr_info("Removing device %s from group %d\n", dev_name(dev), group->id); |
675 | ||
d72e31c9 AW |
676 | /* Pre-notify listeners that a device is being removed. */ |
677 | blocking_notifier_call_chain(&group->notifier, | |
678 | IOMMU_GROUP_NOTIFY_DEL_DEVICE, dev); | |
679 | ||
680 | mutex_lock(&group->mutex); | |
681 | list_for_each_entry(tmp_device, &group->devices, list) { | |
682 | if (tmp_device->dev == dev) { | |
683 | device = tmp_device; | |
684 | list_del(&device->list); | |
685 | break; | |
686 | } | |
687 | } | |
688 | mutex_unlock(&group->mutex); | |
689 | ||
690 | if (!device) | |
691 | return; | |
692 | ||
693 | sysfs_remove_link(group->devices_kobj, device->name); | |
694 | sysfs_remove_link(&dev->kobj, "iommu_group"); | |
695 | ||
2e757086 SK |
696 | trace_remove_device_from_group(group->id, dev); |
697 | ||
d72e31c9 AW |
698 | kfree(device->name); |
699 | kfree(device); | |
700 | dev->iommu_group = NULL; | |
701 | kobject_put(group->devices_kobj); | |
702 | } | |
703 | EXPORT_SYMBOL_GPL(iommu_group_remove_device); | |
704 | ||
426a2738 JR |
705 | static int iommu_group_device_count(struct iommu_group *group) |
706 | { | |
c09e22d5 | 707 | struct group_device *entry; |
426a2738 JR |
708 | int ret = 0; |
709 | ||
710 | list_for_each_entry(entry, &group->devices, list) | |
711 | ret++; | |
712 | ||
713 | return ret; | |
714 | } | |
715 | ||
d72e31c9 AW |
716 | /** |
717 | * iommu_group_for_each_dev - iterate over each device in the group | |
718 | * @group: the group | |
719 | * @data: caller opaque data to be passed to callback function | |
720 | * @fn: caller supplied callback function | |
721 | * | |
722 | * This function is called by group users to iterate over group devices. | |
723 | * Callers should hold a reference count to the group during callback. | |
724 | * The group->mutex is held across callbacks, which will block calls to | |
725 | * iommu_group_add/remove_device. | |
726 | */ | |
e39cb8a3 JR |
727 | static int __iommu_group_for_each_dev(struct iommu_group *group, void *data, |
728 | int (*fn)(struct device *, void *)) | |
d72e31c9 | 729 | { |
c09e22d5 | 730 | struct group_device *device; |
d72e31c9 AW |
731 | int ret = 0; |
732 | ||
d72e31c9 AW |
733 | list_for_each_entry(device, &group->devices, list) { |
734 | ret = fn(device->dev, data); | |
735 | if (ret) | |
736 | break; | |
737 | } | |
e39cb8a3 JR |
738 | return ret; |
739 | } | |
740 | ||
741 | ||
742 | int iommu_group_for_each_dev(struct iommu_group *group, void *data, | |
743 | int (*fn)(struct device *, void *)) | |
744 | { | |
745 | int ret; | |
746 | ||
747 | mutex_lock(&group->mutex); | |
748 | ret = __iommu_group_for_each_dev(group, data, fn); | |
d72e31c9 | 749 | mutex_unlock(&group->mutex); |
e39cb8a3 | 750 | |
d72e31c9 AW |
751 | return ret; |
752 | } | |
753 | EXPORT_SYMBOL_GPL(iommu_group_for_each_dev); | |
754 | ||
755 | /** | |
756 | * iommu_group_get - Return the group for a device and increment reference | |
757 | * @dev: get the group that this device belongs to | |
758 | * | |
759 | * This function is called by iommu drivers and users to get the group | |
760 | * for the specified device. If found, the group is returned and the group | |
761 | * reference in incremented, else NULL. | |
762 | */ | |
763 | struct iommu_group *iommu_group_get(struct device *dev) | |
764 | { | |
765 | struct iommu_group *group = dev->iommu_group; | |
766 | ||
767 | if (group) | |
768 | kobject_get(group->devices_kobj); | |
769 | ||
770 | return group; | |
771 | } | |
772 | EXPORT_SYMBOL_GPL(iommu_group_get); | |
773 | ||
13f59a78 RM |
774 | /** |
775 | * iommu_group_ref_get - Increment reference on a group | |
776 | * @group: the group to use, must not be NULL | |
777 | * | |
778 | * This function is called by iommu drivers to take additional references on an | |
779 | * existing group. Returns the given group for convenience. | |
780 | */ | |
781 | struct iommu_group *iommu_group_ref_get(struct iommu_group *group) | |
782 | { | |
783 | kobject_get(group->devices_kobj); | |
784 | return group; | |
785 | } | |
786 | ||
d72e31c9 AW |
787 | /** |
788 | * iommu_group_put - Decrement group reference | |
789 | * @group: the group to use | |
790 | * | |
791 | * This function is called by iommu drivers and users to release the | |
792 | * iommu group. Once the reference count is zero, the group is released. | |
793 | */ | |
794 | void iommu_group_put(struct iommu_group *group) | |
795 | { | |
796 | if (group) | |
797 | kobject_put(group->devices_kobj); | |
798 | } | |
799 | EXPORT_SYMBOL_GPL(iommu_group_put); | |
800 | ||
801 | /** | |
802 | * iommu_group_register_notifier - Register a notifier for group changes | |
803 | * @group: the group to watch | |
804 | * @nb: notifier block to signal | |
805 | * | |
806 | * This function allows iommu group users to track changes in a group. | |
807 | * See include/linux/iommu.h for actions sent via this notifier. Caller | |
808 | * should hold a reference to the group throughout notifier registration. | |
809 | */ | |
810 | int iommu_group_register_notifier(struct iommu_group *group, | |
811 | struct notifier_block *nb) | |
812 | { | |
813 | return blocking_notifier_chain_register(&group->notifier, nb); | |
814 | } | |
815 | EXPORT_SYMBOL_GPL(iommu_group_register_notifier); | |
816 | ||
817 | /** | |
818 | * iommu_group_unregister_notifier - Unregister a notifier | |
819 | * @group: the group to watch | |
820 | * @nb: notifier block to signal | |
821 | * | |
822 | * Unregister a previously registered group notifier block. | |
823 | */ | |
824 | int iommu_group_unregister_notifier(struct iommu_group *group, | |
825 | struct notifier_block *nb) | |
826 | { | |
827 | return blocking_notifier_chain_unregister(&group->notifier, nb); | |
828 | } | |
829 | EXPORT_SYMBOL_GPL(iommu_group_unregister_notifier); | |
830 | ||
831 | /** | |
832 | * iommu_group_id - Return ID for a group | |
833 | * @group: the group to ID | |
834 | * | |
835 | * Return the unique ID for the group matching the sysfs group number. | |
836 | */ | |
837 | int iommu_group_id(struct iommu_group *group) | |
838 | { | |
839 | return group->id; | |
840 | } | |
841 | EXPORT_SYMBOL_GPL(iommu_group_id); | |
1460432c | 842 | |
f096c061 AW |
843 | static struct iommu_group *get_pci_alias_group(struct pci_dev *pdev, |
844 | unsigned long *devfns); | |
845 | ||
104a1c13 AW |
846 | /* |
847 | * To consider a PCI device isolated, we require ACS to support Source | |
848 | * Validation, Request Redirection, Completer Redirection, and Upstream | |
849 | * Forwarding. This effectively means that devices cannot spoof their | |
850 | * requester ID, requests and completions cannot be redirected, and all | |
851 | * transactions are forwarded upstream, even as it passes through a | |
852 | * bridge where the target device is downstream. | |
853 | */ | |
854 | #define REQ_ACS_FLAGS (PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF) | |
855 | ||
f096c061 AW |
856 | /* |
857 | * For multifunction devices which are not isolated from each other, find | |
858 | * all the other non-isolated functions and look for existing groups. For | |
859 | * each function, we also need to look for aliases to or from other devices | |
860 | * that may already have a group. | |
861 | */ | |
862 | static struct iommu_group *get_pci_function_alias_group(struct pci_dev *pdev, | |
863 | unsigned long *devfns) | |
864 | { | |
865 | struct pci_dev *tmp = NULL; | |
866 | struct iommu_group *group; | |
867 | ||
868 | if (!pdev->multifunction || pci_acs_enabled(pdev, REQ_ACS_FLAGS)) | |
869 | return NULL; | |
870 | ||
871 | for_each_pci_dev(tmp) { | |
872 | if (tmp == pdev || tmp->bus != pdev->bus || | |
873 | PCI_SLOT(tmp->devfn) != PCI_SLOT(pdev->devfn) || | |
874 | pci_acs_enabled(tmp, REQ_ACS_FLAGS)) | |
875 | continue; | |
876 | ||
877 | group = get_pci_alias_group(tmp, devfns); | |
878 | if (group) { | |
879 | pci_dev_put(tmp); | |
880 | return group; | |
881 | } | |
882 | } | |
883 | ||
884 | return NULL; | |
885 | } | |
886 | ||
887 | /* | |
338c3149 JL |
888 | * Look for aliases to or from the given device for existing groups. DMA |
889 | * aliases are only supported on the same bus, therefore the search | |
f096c061 AW |
890 | * space is quite small (especially since we're really only looking at pcie |
891 | * device, and therefore only expect multiple slots on the root complex or | |
892 | * downstream switch ports). It's conceivable though that a pair of | |
893 | * multifunction devices could have aliases between them that would cause a | |
894 | * loop. To prevent this, we use a bitmap to track where we've been. | |
895 | */ | |
896 | static struct iommu_group *get_pci_alias_group(struct pci_dev *pdev, | |
897 | unsigned long *devfns) | |
898 | { | |
899 | struct pci_dev *tmp = NULL; | |
900 | struct iommu_group *group; | |
901 | ||
902 | if (test_and_set_bit(pdev->devfn & 0xff, devfns)) | |
903 | return NULL; | |
904 | ||
905 | group = iommu_group_get(&pdev->dev); | |
906 | if (group) | |
907 | return group; | |
908 | ||
909 | for_each_pci_dev(tmp) { | |
910 | if (tmp == pdev || tmp->bus != pdev->bus) | |
911 | continue; | |
912 | ||
913 | /* We alias them or they alias us */ | |
338c3149 | 914 | if (pci_devs_are_dma_aliases(pdev, tmp)) { |
f096c061 AW |
915 | group = get_pci_alias_group(tmp, devfns); |
916 | if (group) { | |
917 | pci_dev_put(tmp); | |
918 | return group; | |
919 | } | |
920 | ||
921 | group = get_pci_function_alias_group(tmp, devfns); | |
922 | if (group) { | |
923 | pci_dev_put(tmp); | |
924 | return group; | |
925 | } | |
926 | } | |
927 | } | |
928 | ||
929 | return NULL; | |
930 | } | |
931 | ||
104a1c13 AW |
932 | struct group_for_pci_data { |
933 | struct pci_dev *pdev; | |
934 | struct iommu_group *group; | |
935 | }; | |
936 | ||
937 | /* | |
938 | * DMA alias iterator callback, return the last seen device. Stop and return | |
939 | * the IOMMU group if we find one along the way. | |
940 | */ | |
941 | static int get_pci_alias_or_group(struct pci_dev *pdev, u16 alias, void *opaque) | |
942 | { | |
943 | struct group_for_pci_data *data = opaque; | |
944 | ||
945 | data->pdev = pdev; | |
946 | data->group = iommu_group_get(&pdev->dev); | |
947 | ||
948 | return data->group != NULL; | |
949 | } | |
950 | ||
6eab556a JR |
951 | /* |
952 | * Generic device_group call-back function. It just allocates one | |
953 | * iommu-group per device. | |
954 | */ | |
955 | struct iommu_group *generic_device_group(struct device *dev) | |
956 | { | |
7f7a2304 | 957 | return iommu_group_alloc(); |
6eab556a JR |
958 | } |
959 | ||
104a1c13 AW |
960 | /* |
961 | * Use standard PCI bus topology, isolation features, and DMA alias quirks | |
962 | * to find or create an IOMMU group for a device. | |
963 | */ | |
5e62292b | 964 | struct iommu_group *pci_device_group(struct device *dev) |
104a1c13 | 965 | { |
5e62292b | 966 | struct pci_dev *pdev = to_pci_dev(dev); |
104a1c13 AW |
967 | struct group_for_pci_data data; |
968 | struct pci_bus *bus; | |
969 | struct iommu_group *group = NULL; | |
f096c061 | 970 | u64 devfns[4] = { 0 }; |
104a1c13 | 971 | |
5e62292b JR |
972 | if (WARN_ON(!dev_is_pci(dev))) |
973 | return ERR_PTR(-EINVAL); | |
974 | ||
104a1c13 AW |
975 | /* |
976 | * Find the upstream DMA alias for the device. A device must not | |
977 | * be aliased due to topology in order to have its own IOMMU group. | |
978 | * If we find an alias along the way that already belongs to a | |
979 | * group, use it. | |
980 | */ | |
981 | if (pci_for_each_dma_alias(pdev, get_pci_alias_or_group, &data)) | |
982 | return data.group; | |
983 | ||
984 | pdev = data.pdev; | |
985 | ||
986 | /* | |
987 | * Continue upstream from the point of minimum IOMMU granularity | |
988 | * due to aliases to the point where devices are protected from | |
989 | * peer-to-peer DMA by PCI ACS. Again, if we find an existing | |
990 | * group, use it. | |
991 | */ | |
992 | for (bus = pdev->bus; !pci_is_root_bus(bus); bus = bus->parent) { | |
993 | if (!bus->self) | |
994 | continue; | |
995 | ||
996 | if (pci_acs_path_enabled(bus->self, NULL, REQ_ACS_FLAGS)) | |
997 | break; | |
998 | ||
999 | pdev = bus->self; | |
1000 | ||
1001 | group = iommu_group_get(&pdev->dev); | |
1002 | if (group) | |
1003 | return group; | |
1004 | } | |
1005 | ||
1006 | /* | |
f096c061 AW |
1007 | * Look for existing groups on device aliases. If we alias another |
1008 | * device or another device aliases us, use the same group. | |
104a1c13 | 1009 | */ |
f096c061 AW |
1010 | group = get_pci_alias_group(pdev, (unsigned long *)devfns); |
1011 | if (group) | |
1012 | return group; | |
104a1c13 AW |
1013 | |
1014 | /* | |
f096c061 AW |
1015 | * Look for existing groups on non-isolated functions on the same |
1016 | * slot and aliases of those funcions, if any. No need to clear | |
1017 | * the search bitmap, the tested devfns are still valid. | |
104a1c13 | 1018 | */ |
f096c061 AW |
1019 | group = get_pci_function_alias_group(pdev, (unsigned long *)devfns); |
1020 | if (group) | |
1021 | return group; | |
104a1c13 AW |
1022 | |
1023 | /* No shared group found, allocate new */ | |
7f7a2304 | 1024 | return iommu_group_alloc(); |
104a1c13 AW |
1025 | } |
1026 | ||
1027 | /** | |
1028 | * iommu_group_get_for_dev - Find or create the IOMMU group for a device | |
1029 | * @dev: target device | |
1030 | * | |
1031 | * This function is intended to be called by IOMMU drivers and extended to | |
1032 | * support common, bus-defined algorithms when determining or creating the | |
1033 | * IOMMU group for a device. On success, the caller will hold a reference | |
1034 | * to the returned IOMMU group, which will already include the provided | |
1035 | * device. The reference should be released with iommu_group_put(). | |
1036 | */ | |
1037 | struct iommu_group *iommu_group_get_for_dev(struct device *dev) | |
1038 | { | |
46c6b2bc | 1039 | const struct iommu_ops *ops = dev->bus->iommu_ops; |
c4a783b8 | 1040 | struct iommu_group *group; |
104a1c13 AW |
1041 | int ret; |
1042 | ||
1043 | group = iommu_group_get(dev); | |
1044 | if (group) | |
1045 | return group; | |
1046 | ||
05f80300 RM |
1047 | if (!ops) |
1048 | return ERR_PTR(-EINVAL); | |
104a1c13 | 1049 | |
05f80300 | 1050 | group = ops->device_group(dev); |
72dcac63 JR |
1051 | if (WARN_ON_ONCE(group == NULL)) |
1052 | return ERR_PTR(-EINVAL); | |
1053 | ||
104a1c13 AW |
1054 | if (IS_ERR(group)) |
1055 | return group; | |
1056 | ||
1228236d JR |
1057 | /* |
1058 | * Try to allocate a default domain - needs support from the | |
1059 | * IOMMU driver. | |
1060 | */ | |
1061 | if (!group->default_domain) { | |
fccb4e3b WD |
1062 | struct iommu_domain *dom; |
1063 | ||
1064 | dom = __iommu_domain_alloc(dev->bus, iommu_def_domain_type); | |
1065 | if (!dom && iommu_def_domain_type != IOMMU_DOMAIN_DMA) { | |
1066 | dev_warn(dev, | |
1067 | "failed to allocate default IOMMU domain of type %u; falling back to IOMMU_DOMAIN_DMA", | |
1068 | iommu_def_domain_type); | |
1069 | dom = __iommu_domain_alloc(dev->bus, IOMMU_DOMAIN_DMA); | |
1070 | } | |
1071 | ||
1072 | group->default_domain = dom; | |
eebb8034 | 1073 | if (!group->domain) |
fccb4e3b | 1074 | group->domain = dom; |
1228236d JR |
1075 | } |
1076 | ||
104a1c13 AW |
1077 | ret = iommu_group_add_device(group, dev); |
1078 | if (ret) { | |
1079 | iommu_group_put(group); | |
1080 | return ERR_PTR(ret); | |
1081 | } | |
1082 | ||
1083 | return group; | |
1084 | } | |
1085 | ||
6827ca83 JR |
1086 | struct iommu_domain *iommu_group_default_domain(struct iommu_group *group) |
1087 | { | |
1088 | return group->default_domain; | |
1089 | } | |
1090 | ||
d72e31c9 | 1091 | static int add_iommu_group(struct device *dev, void *data) |
1460432c | 1092 | { |
b22f6434 TR |
1093 | struct iommu_callback_data *cb = data; |
1094 | const struct iommu_ops *ops = cb->ops; | |
38667f18 | 1095 | int ret; |
d72e31c9 AW |
1096 | |
1097 | if (!ops->add_device) | |
461bfb3f | 1098 | return 0; |
1460432c | 1099 | |
d72e31c9 AW |
1100 | WARN_ON(dev->iommu_group); |
1101 | ||
38667f18 JR |
1102 | ret = ops->add_device(dev); |
1103 | ||
1104 | /* | |
1105 | * We ignore -ENODEV errors for now, as they just mean that the | |
1106 | * device is not translated by an IOMMU. We still care about | |
1107 | * other errors and fail to initialize when they happen. | |
1108 | */ | |
1109 | if (ret == -ENODEV) | |
1110 | ret = 0; | |
1111 | ||
1112 | return ret; | |
1460432c AW |
1113 | } |
1114 | ||
8da30142 JR |
1115 | static int remove_iommu_group(struct device *dev, void *data) |
1116 | { | |
1117 | struct iommu_callback_data *cb = data; | |
1118 | const struct iommu_ops *ops = cb->ops; | |
1119 | ||
1120 | if (ops->remove_device && dev->iommu_group) | |
1121 | ops->remove_device(dev); | |
1460432c AW |
1122 | |
1123 | return 0; | |
1124 | } | |
1125 | ||
d72e31c9 AW |
1126 | static int iommu_bus_notifier(struct notifier_block *nb, |
1127 | unsigned long action, void *data) | |
1460432c AW |
1128 | { |
1129 | struct device *dev = data; | |
b22f6434 | 1130 | const struct iommu_ops *ops = dev->bus->iommu_ops; |
d72e31c9 AW |
1131 | struct iommu_group *group; |
1132 | unsigned long group_action = 0; | |
1133 | ||
1134 | /* | |
1135 | * ADD/DEL call into iommu driver ops if provided, which may | |
1136 | * result in ADD/DEL notifiers to group->notifier | |
1137 | */ | |
1138 | if (action == BUS_NOTIFY_ADD_DEVICE) { | |
3ba8775f | 1139 | if (ops->add_device) { |
1140 | int ret; | |
1141 | ||
1142 | ret = ops->add_device(dev); | |
1143 | return (ret) ? NOTIFY_DONE : NOTIFY_OK; | |
1144 | } | |
843cb6dc | 1145 | } else if (action == BUS_NOTIFY_REMOVED_DEVICE) { |
d72e31c9 AW |
1146 | if (ops->remove_device && dev->iommu_group) { |
1147 | ops->remove_device(dev); | |
1148 | return 0; | |
1149 | } | |
1150 | } | |
1460432c | 1151 | |
d72e31c9 AW |
1152 | /* |
1153 | * Remaining BUS_NOTIFYs get filtered and republished to the | |
1154 | * group, if anyone is listening | |
1155 | */ | |
1156 | group = iommu_group_get(dev); | |
1157 | if (!group) | |
1158 | return 0; | |
1460432c | 1159 | |
d72e31c9 AW |
1160 | switch (action) { |
1161 | case BUS_NOTIFY_BIND_DRIVER: | |
1162 | group_action = IOMMU_GROUP_NOTIFY_BIND_DRIVER; | |
1163 | break; | |
1164 | case BUS_NOTIFY_BOUND_DRIVER: | |
1165 | group_action = IOMMU_GROUP_NOTIFY_BOUND_DRIVER; | |
1166 | break; | |
1167 | case BUS_NOTIFY_UNBIND_DRIVER: | |
1168 | group_action = IOMMU_GROUP_NOTIFY_UNBIND_DRIVER; | |
1169 | break; | |
1170 | case BUS_NOTIFY_UNBOUND_DRIVER: | |
1171 | group_action = IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER; | |
1172 | break; | |
1173 | } | |
1460432c | 1174 | |
d72e31c9 AW |
1175 | if (group_action) |
1176 | blocking_notifier_call_chain(&group->notifier, | |
1177 | group_action, dev); | |
1460432c | 1178 | |
d72e31c9 | 1179 | iommu_group_put(group); |
1460432c AW |
1180 | return 0; |
1181 | } | |
1182 | ||
fb3e3065 | 1183 | static int iommu_bus_init(struct bus_type *bus, const struct iommu_ops *ops) |
ff21776d | 1184 | { |
fb3e3065 MS |
1185 | int err; |
1186 | struct notifier_block *nb; | |
b22f6434 TR |
1187 | struct iommu_callback_data cb = { |
1188 | .ops = ops, | |
1189 | }; | |
1190 | ||
fb3e3065 MS |
1191 | nb = kzalloc(sizeof(struct notifier_block), GFP_KERNEL); |
1192 | if (!nb) | |
1193 | return -ENOMEM; | |
1194 | ||
1195 | nb->notifier_call = iommu_bus_notifier; | |
1196 | ||
1197 | err = bus_register_notifier(bus, nb); | |
8da30142 JR |
1198 | if (err) |
1199 | goto out_free; | |
d7da6bdc HS |
1200 | |
1201 | err = bus_for_each_dev(bus, NULL, &cb, add_iommu_group); | |
8da30142 JR |
1202 | if (err) |
1203 | goto out_err; | |
1204 | ||
d7da6bdc HS |
1205 | |
1206 | return 0; | |
8da30142 JR |
1207 | |
1208 | out_err: | |
1209 | /* Clean up */ | |
1210 | bus_for_each_dev(bus, NULL, &cb, remove_iommu_group); | |
1211 | bus_unregister_notifier(bus, nb); | |
1212 | ||
1213 | out_free: | |
1214 | kfree(nb); | |
1215 | ||
1216 | return err; | |
ff21776d | 1217 | } |
fc2100eb | 1218 | |
ff21776d JR |
1219 | /** |
1220 | * bus_set_iommu - set iommu-callbacks for the bus | |
1221 | * @bus: bus. | |
1222 | * @ops: the callbacks provided by the iommu-driver | |
1223 | * | |
1224 | * This function is called by an iommu driver to set the iommu methods | |
1225 | * used for a particular bus. Drivers for devices on that bus can use | |
1226 | * the iommu-api after these ops are registered. | |
1227 | * This special function is needed because IOMMUs are usually devices on | |
1228 | * the bus itself, so the iommu drivers are not initialized when the bus | |
1229 | * is set up. With this function the iommu-driver can set the iommu-ops | |
1230 | * afterwards. | |
1231 | */ | |
b22f6434 | 1232 | int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops) |
fc2100eb | 1233 | { |
d7da6bdc HS |
1234 | int err; |
1235 | ||
ff21776d JR |
1236 | if (bus->iommu_ops != NULL) |
1237 | return -EBUSY; | |
fc2100eb | 1238 | |
ff21776d JR |
1239 | bus->iommu_ops = ops; |
1240 | ||
1241 | /* Do IOMMU specific setup for this bus-type */ | |
d7da6bdc HS |
1242 | err = iommu_bus_init(bus, ops); |
1243 | if (err) | |
1244 | bus->iommu_ops = NULL; | |
1245 | ||
1246 | return err; | |
fc2100eb | 1247 | } |
ff21776d | 1248 | EXPORT_SYMBOL_GPL(bus_set_iommu); |
fc2100eb | 1249 | |
a1b60c1c | 1250 | bool iommu_present(struct bus_type *bus) |
fc2100eb | 1251 | { |
94441c3b | 1252 | return bus->iommu_ops != NULL; |
fc2100eb | 1253 | } |
a1b60c1c | 1254 | EXPORT_SYMBOL_GPL(iommu_present); |
fc2100eb | 1255 | |
3c0e0ca0 JR |
1256 | bool iommu_capable(struct bus_type *bus, enum iommu_cap cap) |
1257 | { | |
1258 | if (!bus->iommu_ops || !bus->iommu_ops->capable) | |
1259 | return false; | |
1260 | ||
1261 | return bus->iommu_ops->capable(cap); | |
1262 | } | |
1263 | EXPORT_SYMBOL_GPL(iommu_capable); | |
1264 | ||
4f3f8d9d OBC |
1265 | /** |
1266 | * iommu_set_fault_handler() - set a fault handler for an iommu domain | |
1267 | * @domain: iommu domain | |
1268 | * @handler: fault handler | |
77ca2332 | 1269 | * @token: user data, will be passed back to the fault handler |
0ed6d2d2 OBC |
1270 | * |
1271 | * This function should be used by IOMMU users which want to be notified | |
1272 | * whenever an IOMMU fault happens. | |
1273 | * | |
1274 | * The fault handler itself should return 0 on success, and an appropriate | |
1275 | * error code otherwise. | |
4f3f8d9d OBC |
1276 | */ |
1277 | void iommu_set_fault_handler(struct iommu_domain *domain, | |
77ca2332 OBC |
1278 | iommu_fault_handler_t handler, |
1279 | void *token) | |
4f3f8d9d OBC |
1280 | { |
1281 | BUG_ON(!domain); | |
1282 | ||
1283 | domain->handler = handler; | |
77ca2332 | 1284 | domain->handler_token = token; |
4f3f8d9d | 1285 | } |
30bd918c | 1286 | EXPORT_SYMBOL_GPL(iommu_set_fault_handler); |
4f3f8d9d | 1287 | |
53723dc5 JR |
1288 | static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus, |
1289 | unsigned type) | |
fc2100eb JR |
1290 | { |
1291 | struct iommu_domain *domain; | |
fc2100eb | 1292 | |
94441c3b | 1293 | if (bus == NULL || bus->iommu_ops == NULL) |
905d66c1 JR |
1294 | return NULL; |
1295 | ||
53723dc5 | 1296 | domain = bus->iommu_ops->domain_alloc(type); |
fc2100eb JR |
1297 | if (!domain) |
1298 | return NULL; | |
1299 | ||
8539c7c1 | 1300 | domain->ops = bus->iommu_ops; |
53723dc5 | 1301 | domain->type = type; |
d16e0faa RM |
1302 | /* Assume all sizes by default; the driver may override this later */ |
1303 | domain->pgsize_bitmap = bus->iommu_ops->pgsize_bitmap; | |
905d66c1 | 1304 | |
fc2100eb | 1305 | return domain; |
fc2100eb | 1306 | } |
fc2100eb | 1307 | |
53723dc5 JR |
1308 | struct iommu_domain *iommu_domain_alloc(struct bus_type *bus) |
1309 | { | |
1310 | return __iommu_domain_alloc(bus, IOMMU_DOMAIN_UNMANAGED); | |
fc2100eb JR |
1311 | } |
1312 | EXPORT_SYMBOL_GPL(iommu_domain_alloc); | |
1313 | ||
1314 | void iommu_domain_free(struct iommu_domain *domain) | |
1315 | { | |
89be34a1 | 1316 | domain->ops->domain_free(domain); |
fc2100eb JR |
1317 | } |
1318 | EXPORT_SYMBOL_GPL(iommu_domain_free); | |
1319 | ||
426a2738 JR |
1320 | static int __iommu_attach_device(struct iommu_domain *domain, |
1321 | struct device *dev) | |
fc2100eb | 1322 | { |
b54db778 | 1323 | int ret; |
e01d1913 BH |
1324 | if ((domain->ops->is_attach_deferred != NULL) && |
1325 | domain->ops->is_attach_deferred(domain, dev)) | |
1326 | return 0; | |
1327 | ||
e5aa7f00 JR |
1328 | if (unlikely(domain->ops->attach_dev == NULL)) |
1329 | return -ENODEV; | |
1330 | ||
b54db778 SK |
1331 | ret = domain->ops->attach_dev(domain, dev); |
1332 | if (!ret) | |
1333 | trace_attach_device_to_domain(dev); | |
1334 | return ret; | |
fc2100eb | 1335 | } |
426a2738 JR |
1336 | |
1337 | int iommu_attach_device(struct iommu_domain *domain, struct device *dev) | |
1338 | { | |
1339 | struct iommu_group *group; | |
1340 | int ret; | |
1341 | ||
1342 | group = iommu_group_get(dev); | |
9ae9df03 JC |
1343 | if (!group) |
1344 | return -ENODEV; | |
1345 | ||
426a2738 | 1346 | /* |
05f80300 | 1347 | * Lock the group to make sure the device-count doesn't |
426a2738 JR |
1348 | * change while we are attaching |
1349 | */ | |
1350 | mutex_lock(&group->mutex); | |
1351 | ret = -EINVAL; | |
1352 | if (iommu_group_device_count(group) != 1) | |
1353 | goto out_unlock; | |
1354 | ||
e39cb8a3 | 1355 | ret = __iommu_attach_group(domain, group); |
426a2738 JR |
1356 | |
1357 | out_unlock: | |
1358 | mutex_unlock(&group->mutex); | |
1359 | iommu_group_put(group); | |
1360 | ||
1361 | return ret; | |
1362 | } | |
fc2100eb JR |
1363 | EXPORT_SYMBOL_GPL(iommu_attach_device); |
1364 | ||
426a2738 JR |
1365 | static void __iommu_detach_device(struct iommu_domain *domain, |
1366 | struct device *dev) | |
fc2100eb | 1367 | { |
e01d1913 BH |
1368 | if ((domain->ops->is_attach_deferred != NULL) && |
1369 | domain->ops->is_attach_deferred(domain, dev)) | |
1370 | return; | |
1371 | ||
e5aa7f00 JR |
1372 | if (unlikely(domain->ops->detach_dev == NULL)) |
1373 | return; | |
1374 | ||
1375 | domain->ops->detach_dev(domain, dev); | |
69980630 | 1376 | trace_detach_device_from_domain(dev); |
fc2100eb | 1377 | } |
426a2738 JR |
1378 | |
1379 | void iommu_detach_device(struct iommu_domain *domain, struct device *dev) | |
1380 | { | |
1381 | struct iommu_group *group; | |
1382 | ||
1383 | group = iommu_group_get(dev); | |
9ae9df03 JC |
1384 | if (!group) |
1385 | return; | |
426a2738 JR |
1386 | |
1387 | mutex_lock(&group->mutex); | |
1388 | if (iommu_group_device_count(group) != 1) { | |
1389 | WARN_ON(1); | |
1390 | goto out_unlock; | |
1391 | } | |
1392 | ||
e39cb8a3 | 1393 | __iommu_detach_group(domain, group); |
426a2738 JR |
1394 | |
1395 | out_unlock: | |
1396 | mutex_unlock(&group->mutex); | |
1397 | iommu_group_put(group); | |
1398 | } | |
fc2100eb JR |
1399 | EXPORT_SYMBOL_GPL(iommu_detach_device); |
1400 | ||
2c1296d9 JR |
1401 | struct iommu_domain *iommu_get_domain_for_dev(struct device *dev) |
1402 | { | |
1403 | struct iommu_domain *domain; | |
1404 | struct iommu_group *group; | |
1405 | ||
1406 | group = iommu_group_get(dev); | |
1464d0b1 | 1407 | if (!group) |
2c1296d9 JR |
1408 | return NULL; |
1409 | ||
1410 | domain = group->domain; | |
1411 | ||
1412 | iommu_group_put(group); | |
1413 | ||
1414 | return domain; | |
1415 | } | |
1416 | EXPORT_SYMBOL_GPL(iommu_get_domain_for_dev); | |
fc2100eb | 1417 | |
6af588fe RM |
1418 | /* |
1419 | * For IOMMU_DOMAIN_DMA implementations which already provide their own | |
1420 | * guarantees that the group and its default domain are valid and correct. | |
1421 | */ | |
1422 | struct iommu_domain *iommu_get_dma_domain(struct device *dev) | |
1423 | { | |
1424 | return dev->iommu_group->default_domain; | |
1425 | } | |
1426 | ||
d72e31c9 AW |
1427 | /* |
1428 | * IOMMU groups are really the natrual working unit of the IOMMU, but | |
1429 | * the IOMMU API works on domains and devices. Bridge that gap by | |
1430 | * iterating over the devices in a group. Ideally we'd have a single | |
1431 | * device which represents the requestor ID of the group, but we also | |
1432 | * allow IOMMU drivers to create policy defined minimum sets, where | |
1433 | * the physical hardware may be able to distiguish members, but we | |
1434 | * wish to group them at a higher level (ex. untrusted multi-function | |
1435 | * PCI devices). Thus we attach each device. | |
1436 | */ | |
1437 | static int iommu_group_do_attach_device(struct device *dev, void *data) | |
1438 | { | |
1439 | struct iommu_domain *domain = data; | |
1440 | ||
426a2738 | 1441 | return __iommu_attach_device(domain, dev); |
d72e31c9 AW |
1442 | } |
1443 | ||
e39cb8a3 JR |
1444 | static int __iommu_attach_group(struct iommu_domain *domain, |
1445 | struct iommu_group *group) | |
1446 | { | |
1447 | int ret; | |
1448 | ||
1449 | if (group->default_domain && group->domain != group->default_domain) | |
1450 | return -EBUSY; | |
1451 | ||
1452 | ret = __iommu_group_for_each_dev(group, domain, | |
1453 | iommu_group_do_attach_device); | |
1454 | if (ret == 0) | |
1455 | group->domain = domain; | |
1456 | ||
1457 | return ret; | |
d72e31c9 AW |
1458 | } |
1459 | ||
1460 | int iommu_attach_group(struct iommu_domain *domain, struct iommu_group *group) | |
1461 | { | |
e39cb8a3 JR |
1462 | int ret; |
1463 | ||
1464 | mutex_lock(&group->mutex); | |
1465 | ret = __iommu_attach_group(domain, group); | |
1466 | mutex_unlock(&group->mutex); | |
1467 | ||
1468 | return ret; | |
d72e31c9 AW |
1469 | } |
1470 | EXPORT_SYMBOL_GPL(iommu_attach_group); | |
1471 | ||
1472 | static int iommu_group_do_detach_device(struct device *dev, void *data) | |
1473 | { | |
1474 | struct iommu_domain *domain = data; | |
1475 | ||
426a2738 | 1476 | __iommu_detach_device(domain, dev); |
d72e31c9 AW |
1477 | |
1478 | return 0; | |
1479 | } | |
1480 | ||
e39cb8a3 JR |
1481 | static void __iommu_detach_group(struct iommu_domain *domain, |
1482 | struct iommu_group *group) | |
1483 | { | |
1484 | int ret; | |
1485 | ||
1486 | if (!group->default_domain) { | |
1487 | __iommu_group_for_each_dev(group, domain, | |
1488 | iommu_group_do_detach_device); | |
1489 | group->domain = NULL; | |
1490 | return; | |
1491 | } | |
1492 | ||
1493 | if (group->domain == group->default_domain) | |
1494 | return; | |
1495 | ||
1496 | /* Detach by re-attaching to the default domain */ | |
1497 | ret = __iommu_group_for_each_dev(group, group->default_domain, | |
1498 | iommu_group_do_attach_device); | |
1499 | if (ret != 0) | |
1500 | WARN_ON(1); | |
1501 | else | |
1502 | group->domain = group->default_domain; | |
1503 | } | |
1504 | ||
d72e31c9 AW |
1505 | void iommu_detach_group(struct iommu_domain *domain, struct iommu_group *group) |
1506 | { | |
e39cb8a3 JR |
1507 | mutex_lock(&group->mutex); |
1508 | __iommu_detach_group(domain, group); | |
1509 | mutex_unlock(&group->mutex); | |
d72e31c9 AW |
1510 | } |
1511 | EXPORT_SYMBOL_GPL(iommu_detach_group); | |
1512 | ||
bb5547ac | 1513 | phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova) |
fc2100eb | 1514 | { |
e5aa7f00 JR |
1515 | if (unlikely(domain->ops->iova_to_phys == NULL)) |
1516 | return 0; | |
1517 | ||
1518 | return domain->ops->iova_to_phys(domain, iova); | |
fc2100eb JR |
1519 | } |
1520 | EXPORT_SYMBOL_GPL(iommu_iova_to_phys); | |
dbb9fd86 | 1521 | |
bd13969b AW |
1522 | static size_t iommu_pgsize(struct iommu_domain *domain, |
1523 | unsigned long addr_merge, size_t size) | |
1524 | { | |
1525 | unsigned int pgsize_idx; | |
1526 | size_t pgsize; | |
1527 | ||
1528 | /* Max page size that still fits into 'size' */ | |
1529 | pgsize_idx = __fls(size); | |
1530 | ||
1531 | /* need to consider alignment requirements ? */ | |
1532 | if (likely(addr_merge)) { | |
1533 | /* Max page size allowed by address */ | |
1534 | unsigned int align_pgsize_idx = __ffs(addr_merge); | |
1535 | pgsize_idx = min(pgsize_idx, align_pgsize_idx); | |
1536 | } | |
1537 | ||
1538 | /* build a mask of acceptable page sizes */ | |
1539 | pgsize = (1UL << (pgsize_idx + 1)) - 1; | |
1540 | ||
1541 | /* throw away page sizes not supported by the hardware */ | |
d16e0faa | 1542 | pgsize &= domain->pgsize_bitmap; |
bd13969b AW |
1543 | |
1544 | /* make sure we're still sane */ | |
1545 | BUG_ON(!pgsize); | |
1546 | ||
1547 | /* pick the biggest page */ | |
1548 | pgsize_idx = __fls(pgsize); | |
1549 | pgsize = 1UL << pgsize_idx; | |
1550 | ||
1551 | return pgsize; | |
1552 | } | |
1553 | ||
cefc53c7 | 1554 | int iommu_map(struct iommu_domain *domain, unsigned long iova, |
7d3002cc | 1555 | phys_addr_t paddr, size_t size, int prot) |
cefc53c7 | 1556 | { |
7d3002cc OBC |
1557 | unsigned long orig_iova = iova; |
1558 | unsigned int min_pagesz; | |
1559 | size_t orig_size = size; | |
06bfcaa9 | 1560 | phys_addr_t orig_paddr = paddr; |
7d3002cc | 1561 | int ret = 0; |
cefc53c7 | 1562 | |
9db4ad91 | 1563 | if (unlikely(domain->ops->map == NULL || |
d16e0faa | 1564 | domain->pgsize_bitmap == 0UL)) |
e5aa7f00 | 1565 | return -ENODEV; |
cefc53c7 | 1566 | |
a10315e5 JR |
1567 | if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING))) |
1568 | return -EINVAL; | |
1569 | ||
7d3002cc | 1570 | /* find out the minimum page size supported */ |
d16e0faa | 1571 | min_pagesz = 1 << __ffs(domain->pgsize_bitmap); |
7d3002cc OBC |
1572 | |
1573 | /* | |
1574 | * both the virtual address and the physical one, as well as | |
1575 | * the size of the mapping, must be aligned (at least) to the | |
1576 | * size of the smallest page supported by the hardware | |
1577 | */ | |
1578 | if (!IS_ALIGNED(iova | paddr | size, min_pagesz)) { | |
abedb049 | 1579 | pr_err("unaligned: iova 0x%lx pa %pa size 0x%zx min_pagesz 0x%x\n", |
6197ca82 | 1580 | iova, &paddr, size, min_pagesz); |
7d3002cc OBC |
1581 | return -EINVAL; |
1582 | } | |
1583 | ||
abedb049 | 1584 | pr_debug("map: iova 0x%lx pa %pa size 0x%zx\n", iova, &paddr, size); |
7d3002cc OBC |
1585 | |
1586 | while (size) { | |
bd13969b | 1587 | size_t pgsize = iommu_pgsize(domain, iova | paddr, size); |
7d3002cc | 1588 | |
abedb049 | 1589 | pr_debug("mapping: iova 0x%lx pa %pa pgsize 0x%zx\n", |
6197ca82 | 1590 | iova, &paddr, pgsize); |
7d3002cc OBC |
1591 | |
1592 | ret = domain->ops->map(domain, iova, paddr, pgsize, prot); | |
1593 | if (ret) | |
1594 | break; | |
1595 | ||
1596 | iova += pgsize; | |
1597 | paddr += pgsize; | |
1598 | size -= pgsize; | |
1599 | } | |
1600 | ||
1601 | /* unroll mapping in case something went wrong */ | |
1602 | if (ret) | |
1603 | iommu_unmap(domain, orig_iova, orig_size - size); | |
e0be7c86 | 1604 | else |
06bfcaa9 | 1605 | trace_map(orig_iova, orig_paddr, orig_size); |
7d3002cc OBC |
1606 | |
1607 | return ret; | |
cefc53c7 JR |
1608 | } |
1609 | EXPORT_SYMBOL_GPL(iommu_map); | |
1610 | ||
add02cfd JR |
1611 | static size_t __iommu_unmap(struct iommu_domain *domain, |
1612 | unsigned long iova, size_t size, | |
1613 | bool sync) | |
cefc53c7 | 1614 | { |
add02cfd | 1615 | const struct iommu_ops *ops = domain->ops; |
7d3002cc | 1616 | size_t unmapped_page, unmapped = 0; |
6fd492fd | 1617 | unsigned long orig_iova = iova; |
add02cfd | 1618 | unsigned int min_pagesz; |
cefc53c7 | 1619 | |
add02cfd | 1620 | if (unlikely(ops->unmap == NULL || |
d16e0faa | 1621 | domain->pgsize_bitmap == 0UL)) |
c5611a87 | 1622 | return 0; |
e5aa7f00 | 1623 | |
a10315e5 | 1624 | if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING))) |
c5611a87 | 1625 | return 0; |
a10315e5 | 1626 | |
7d3002cc | 1627 | /* find out the minimum page size supported */ |
d16e0faa | 1628 | min_pagesz = 1 << __ffs(domain->pgsize_bitmap); |
7d3002cc OBC |
1629 | |
1630 | /* | |
1631 | * The virtual address, as well as the size of the mapping, must be | |
1632 | * aligned (at least) to the size of the smallest page supported | |
1633 | * by the hardware | |
1634 | */ | |
1635 | if (!IS_ALIGNED(iova | size, min_pagesz)) { | |
6197ca82 JP |
1636 | pr_err("unaligned: iova 0x%lx size 0x%zx min_pagesz 0x%x\n", |
1637 | iova, size, min_pagesz); | |
c5611a87 | 1638 | return 0; |
7d3002cc OBC |
1639 | } |
1640 | ||
6197ca82 | 1641 | pr_debug("unmap this: iova 0x%lx size 0x%zx\n", iova, size); |
7d3002cc OBC |
1642 | |
1643 | /* | |
1644 | * Keep iterating until we either unmap 'size' bytes (or more) | |
1645 | * or we hit an area that isn't mapped. | |
1646 | */ | |
1647 | while (unmapped < size) { | |
bd13969b | 1648 | size_t pgsize = iommu_pgsize(domain, iova, size - unmapped); |
7d3002cc | 1649 | |
add02cfd | 1650 | unmapped_page = ops->unmap(domain, iova, pgsize); |
7d3002cc OBC |
1651 | if (!unmapped_page) |
1652 | break; | |
1653 | ||
add02cfd JR |
1654 | if (sync && ops->iotlb_range_add) |
1655 | ops->iotlb_range_add(domain, iova, pgsize); | |
1656 | ||
6197ca82 JP |
1657 | pr_debug("unmapped: iova 0x%lx size 0x%zx\n", |
1658 | iova, unmapped_page); | |
7d3002cc OBC |
1659 | |
1660 | iova += unmapped_page; | |
1661 | unmapped += unmapped_page; | |
1662 | } | |
1663 | ||
add02cfd JR |
1664 | if (sync && ops->iotlb_sync) |
1665 | ops->iotlb_sync(domain); | |
1666 | ||
db8614d3 | 1667 | trace_unmap(orig_iova, size, unmapped); |
7d3002cc | 1668 | return unmapped; |
cefc53c7 | 1669 | } |
add02cfd JR |
1670 | |
1671 | size_t iommu_unmap(struct iommu_domain *domain, | |
1672 | unsigned long iova, size_t size) | |
1673 | { | |
1674 | return __iommu_unmap(domain, iova, size, true); | |
1675 | } | |
cefc53c7 | 1676 | EXPORT_SYMBOL_GPL(iommu_unmap); |
1460432c | 1677 | |
add02cfd JR |
1678 | size_t iommu_unmap_fast(struct iommu_domain *domain, |
1679 | unsigned long iova, size_t size) | |
1680 | { | |
1681 | return __iommu_unmap(domain, iova, size, false); | |
1682 | } | |
1683 | EXPORT_SYMBOL_GPL(iommu_unmap_fast); | |
1684 | ||
d88e61fa CH |
1685 | size_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova, |
1686 | struct scatterlist *sg, unsigned int nents, int prot) | |
315786eb | 1687 | { |
38ec010d | 1688 | struct scatterlist *s; |
315786eb | 1689 | size_t mapped = 0; |
18f23409 | 1690 | unsigned int i, min_pagesz; |
38ec010d | 1691 | int ret; |
315786eb | 1692 | |
d16e0faa | 1693 | if (unlikely(domain->pgsize_bitmap == 0UL)) |
18f23409 | 1694 | return 0; |
315786eb | 1695 | |
d16e0faa | 1696 | min_pagesz = 1 << __ffs(domain->pgsize_bitmap); |
18f23409 RM |
1697 | |
1698 | for_each_sg(sg, s, nents, i) { | |
3e6110fd | 1699 | phys_addr_t phys = page_to_phys(sg_page(s)) + s->offset; |
18f23409 RM |
1700 | |
1701 | /* | |
1702 | * We are mapping on IOMMU page boundaries, so offset within | |
1703 | * the page must be 0. However, the IOMMU may support pages | |
1704 | * smaller than PAGE_SIZE, so s->offset may still represent | |
1705 | * an offset of that boundary within the CPU page. | |
1706 | */ | |
1707 | if (!IS_ALIGNED(s->offset, min_pagesz)) | |
38ec010d JR |
1708 | goto out_err; |
1709 | ||
1710 | ret = iommu_map(domain, iova + mapped, phys, s->length, prot); | |
1711 | if (ret) | |
1712 | goto out_err; | |
1713 | ||
1714 | mapped += s->length; | |
315786eb OH |
1715 | } |
1716 | ||
1717 | return mapped; | |
38ec010d JR |
1718 | |
1719 | out_err: | |
1720 | /* undo mappings already done */ | |
1721 | iommu_unmap(domain, iova, mapped); | |
1722 | ||
1723 | return 0; | |
1724 | ||
315786eb | 1725 | } |
d88e61fa | 1726 | EXPORT_SYMBOL_GPL(iommu_map_sg); |
d7787d57 JR |
1727 | |
1728 | int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr, | |
80f97f0f | 1729 | phys_addr_t paddr, u64 size, int prot) |
d7787d57 JR |
1730 | { |
1731 | if (unlikely(domain->ops->domain_window_enable == NULL)) | |
1732 | return -ENODEV; | |
1733 | ||
80f97f0f VS |
1734 | return domain->ops->domain_window_enable(domain, wnd_nr, paddr, size, |
1735 | prot); | |
d7787d57 JR |
1736 | } |
1737 | EXPORT_SYMBOL_GPL(iommu_domain_window_enable); | |
1738 | ||
1739 | void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr) | |
1740 | { | |
1741 | if (unlikely(domain->ops->domain_window_disable == NULL)) | |
1742 | return; | |
1743 | ||
1744 | return domain->ops->domain_window_disable(domain, wnd_nr); | |
1745 | } | |
1746 | EXPORT_SYMBOL_GPL(iommu_domain_window_disable); | |
1747 | ||
207c6e36 JR |
1748 | /** |
1749 | * report_iommu_fault() - report about an IOMMU fault to the IOMMU framework | |
1750 | * @domain: the iommu domain where the fault has happened | |
1751 | * @dev: the device where the fault has happened | |
1752 | * @iova: the faulting address | |
1753 | * @flags: mmu fault flags (e.g. IOMMU_FAULT_READ/IOMMU_FAULT_WRITE/...) | |
1754 | * | |
1755 | * This function should be called by the low-level IOMMU implementations | |
1756 | * whenever IOMMU faults happen, to allow high-level users, that are | |
1757 | * interested in such events, to know about them. | |
1758 | * | |
1759 | * This event may be useful for several possible use cases: | |
1760 | * - mere logging of the event | |
1761 | * - dynamic TLB/PTE loading | |
1762 | * - if restarting of the faulting device is required | |
1763 | * | |
1764 | * Returns 0 on success and an appropriate error code otherwise (if dynamic | |
1765 | * PTE/TLB loading will one day be supported, implementations will be able | |
1766 | * to tell whether it succeeded or not according to this return value). | |
1767 | * | |
1768 | * Specifically, -ENOSYS is returned if a fault handler isn't installed | |
1769 | * (though fault handlers can also return -ENOSYS, in case they want to | |
1770 | * elicit the default behavior of the IOMMU drivers). | |
1771 | */ | |
1772 | int report_iommu_fault(struct iommu_domain *domain, struct device *dev, | |
1773 | unsigned long iova, int flags) | |
1774 | { | |
1775 | int ret = -ENOSYS; | |
1776 | ||
1777 | /* | |
1778 | * if upper layers showed interest and installed a fault handler, | |
1779 | * invoke it. | |
1780 | */ | |
1781 | if (domain->handler) | |
1782 | ret = domain->handler(domain, dev, iova, flags, | |
1783 | domain->handler_token); | |
1784 | ||
1785 | trace_io_page_fault(dev, iova, flags); | |
1786 | return ret; | |
1787 | } | |
1788 | EXPORT_SYMBOL_GPL(report_iommu_fault); | |
1789 | ||
d72e31c9 | 1790 | static int __init iommu_init(void) |
1460432c | 1791 | { |
d72e31c9 AW |
1792 | iommu_group_kset = kset_create_and_add("iommu_groups", |
1793 | NULL, kernel_kobj); | |
d72e31c9 AW |
1794 | BUG_ON(!iommu_group_kset); |
1795 | ||
bad614b2 GH |
1796 | iommu_debugfs_setup(); |
1797 | ||
d72e31c9 | 1798 | return 0; |
1460432c | 1799 | } |
d7ef9995 | 1800 | core_initcall(iommu_init); |
0cd76dd1 JR |
1801 | |
1802 | int iommu_domain_get_attr(struct iommu_domain *domain, | |
1803 | enum iommu_attr attr, void *data) | |
1804 | { | |
0ff64f80 | 1805 | struct iommu_domain_geometry *geometry; |
d2e12160 | 1806 | bool *paging; |
0ff64f80 JR |
1807 | int ret = 0; |
1808 | ||
1809 | switch (attr) { | |
1810 | case DOMAIN_ATTR_GEOMETRY: | |
1811 | geometry = data; | |
1812 | *geometry = domain->geometry; | |
1813 | ||
d2e12160 JR |
1814 | break; |
1815 | case DOMAIN_ATTR_PAGING: | |
1816 | paging = data; | |
d16e0faa | 1817 | *paging = (domain->pgsize_bitmap != 0UL); |
0ff64f80 JR |
1818 | break; |
1819 | default: | |
1820 | if (!domain->ops->domain_get_attr) | |
1821 | return -EINVAL; | |
0cd76dd1 | 1822 | |
0ff64f80 JR |
1823 | ret = domain->ops->domain_get_attr(domain, attr, data); |
1824 | } | |
1825 | ||
1826 | return ret; | |
0cd76dd1 JR |
1827 | } |
1828 | EXPORT_SYMBOL_GPL(iommu_domain_get_attr); | |
1829 | ||
1830 | int iommu_domain_set_attr(struct iommu_domain *domain, | |
1831 | enum iommu_attr attr, void *data) | |
1832 | { | |
69356712 | 1833 | int ret = 0; |
69356712 JR |
1834 | |
1835 | switch (attr) { | |
69356712 JR |
1836 | default: |
1837 | if (domain->ops->domain_set_attr == NULL) | |
1838 | return -EINVAL; | |
1839 | ||
1840 | ret = domain->ops->domain_set_attr(domain, attr, data); | |
1841 | } | |
1842 | ||
1843 | return ret; | |
1460432c | 1844 | } |
0cd76dd1 | 1845 | EXPORT_SYMBOL_GPL(iommu_domain_set_attr); |
a1015c2b | 1846 | |
e5b5234a | 1847 | void iommu_get_resv_regions(struct device *dev, struct list_head *list) |
a1015c2b JR |
1848 | { |
1849 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
1850 | ||
e5b5234a EA |
1851 | if (ops && ops->get_resv_regions) |
1852 | ops->get_resv_regions(dev, list); | |
a1015c2b JR |
1853 | } |
1854 | ||
e5b5234a | 1855 | void iommu_put_resv_regions(struct device *dev, struct list_head *list) |
a1015c2b JR |
1856 | { |
1857 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
1858 | ||
e5b5234a EA |
1859 | if (ops && ops->put_resv_regions) |
1860 | ops->put_resv_regions(dev, list); | |
a1015c2b | 1861 | } |
d290f1e7 | 1862 | |
2b20cbba | 1863 | struct iommu_resv_region *iommu_alloc_resv_region(phys_addr_t start, |
9d3a4de4 RM |
1864 | size_t length, int prot, |
1865 | enum iommu_resv_type type) | |
2b20cbba EA |
1866 | { |
1867 | struct iommu_resv_region *region; | |
1868 | ||
1869 | region = kzalloc(sizeof(*region), GFP_KERNEL); | |
1870 | if (!region) | |
1871 | return NULL; | |
1872 | ||
1873 | INIT_LIST_HEAD(®ion->list); | |
1874 | region->start = start; | |
1875 | region->length = length; | |
1876 | region->prot = prot; | |
1877 | region->type = type; | |
1878 | return region; | |
a1015c2b | 1879 | } |
d290f1e7 JR |
1880 | |
1881 | /* Request that a device is direct mapped by the IOMMU */ | |
1882 | int iommu_request_dm_for_dev(struct device *dev) | |
1883 | { | |
1884 | struct iommu_domain *dm_domain; | |
1885 | struct iommu_group *group; | |
1886 | int ret; | |
1887 | ||
1888 | /* Device must already be in a group before calling this function */ | |
1889 | group = iommu_group_get_for_dev(dev); | |
409e553d DC |
1890 | if (IS_ERR(group)) |
1891 | return PTR_ERR(group); | |
d290f1e7 JR |
1892 | |
1893 | mutex_lock(&group->mutex); | |
1894 | ||
1895 | /* Check if the default domain is already direct mapped */ | |
1896 | ret = 0; | |
1897 | if (group->default_domain && | |
1898 | group->default_domain->type == IOMMU_DOMAIN_IDENTITY) | |
1899 | goto out; | |
1900 | ||
1901 | /* Don't change mappings of existing devices */ | |
1902 | ret = -EBUSY; | |
1903 | if (iommu_group_device_count(group) != 1) | |
1904 | goto out; | |
1905 | ||
1906 | /* Allocate a direct mapped domain */ | |
1907 | ret = -ENOMEM; | |
1908 | dm_domain = __iommu_domain_alloc(dev->bus, IOMMU_DOMAIN_IDENTITY); | |
1909 | if (!dm_domain) | |
1910 | goto out; | |
1911 | ||
1912 | /* Attach the device to the domain */ | |
1913 | ret = __iommu_attach_group(dm_domain, group); | |
1914 | if (ret) { | |
1915 | iommu_domain_free(dm_domain); | |
1916 | goto out; | |
1917 | } | |
1918 | ||
1919 | /* Make the direct mapped domain the default for this group */ | |
1920 | if (group->default_domain) | |
1921 | iommu_domain_free(group->default_domain); | |
1922 | group->default_domain = dm_domain; | |
1923 | ||
1924 | pr_info("Using direct mapping for device %s\n", dev_name(dev)); | |
1925 | ||
1926 | ret = 0; | |
1927 | out: | |
1928 | mutex_unlock(&group->mutex); | |
1929 | iommu_group_put(group); | |
1930 | ||
1931 | return ret; | |
1932 | } | |
57f98d2f | 1933 | |
534766df | 1934 | const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode) |
e4f10ffe | 1935 | { |
e4f10ffe | 1936 | const struct iommu_ops *ops = NULL; |
d0f6f583 | 1937 | struct iommu_device *iommu; |
e4f10ffe | 1938 | |
d0f6f583 JR |
1939 | spin_lock(&iommu_device_lock); |
1940 | list_for_each_entry(iommu, &iommu_device_list, list) | |
1941 | if (iommu->fwnode == fwnode) { | |
1942 | ops = iommu->ops; | |
e4f10ffe LP |
1943 | break; |
1944 | } | |
d0f6f583 | 1945 | spin_unlock(&iommu_device_lock); |
e4f10ffe LP |
1946 | return ops; |
1947 | } | |
1948 | ||
57f98d2f RM |
1949 | int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode, |
1950 | const struct iommu_ops *ops) | |
1951 | { | |
1952 | struct iommu_fwspec *fwspec = dev->iommu_fwspec; | |
1953 | ||
1954 | if (fwspec) | |
1955 | return ops == fwspec->ops ? 0 : -EINVAL; | |
1956 | ||
1957 | fwspec = kzalloc(sizeof(*fwspec), GFP_KERNEL); | |
1958 | if (!fwspec) | |
1959 | return -ENOMEM; | |
1960 | ||
1961 | of_node_get(to_of_node(iommu_fwnode)); | |
1962 | fwspec->iommu_fwnode = iommu_fwnode; | |
1963 | fwspec->ops = ops; | |
1964 | dev->iommu_fwspec = fwspec; | |
1965 | return 0; | |
1966 | } | |
1967 | EXPORT_SYMBOL_GPL(iommu_fwspec_init); | |
1968 | ||
1969 | void iommu_fwspec_free(struct device *dev) | |
1970 | { | |
1971 | struct iommu_fwspec *fwspec = dev->iommu_fwspec; | |
1972 | ||
1973 | if (fwspec) { | |
1974 | fwnode_handle_put(fwspec->iommu_fwnode); | |
1975 | kfree(fwspec); | |
1976 | dev->iommu_fwspec = NULL; | |
1977 | } | |
1978 | } | |
1979 | EXPORT_SYMBOL_GPL(iommu_fwspec_free); | |
1980 | ||
1981 | int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids) | |
1982 | { | |
1983 | struct iommu_fwspec *fwspec = dev->iommu_fwspec; | |
1984 | size_t size; | |
1985 | int i; | |
1986 | ||
1987 | if (!fwspec) | |
1988 | return -EINVAL; | |
1989 | ||
1990 | size = offsetof(struct iommu_fwspec, ids[fwspec->num_ids + num_ids]); | |
1991 | if (size > sizeof(*fwspec)) { | |
1992 | fwspec = krealloc(dev->iommu_fwspec, size, GFP_KERNEL); | |
1993 | if (!fwspec) | |
1994 | return -ENOMEM; | |
909111ba ZL |
1995 | |
1996 | dev->iommu_fwspec = fwspec; | |
57f98d2f RM |
1997 | } |
1998 | ||
1999 | for (i = 0; i < num_ids; i++) | |
2000 | fwspec->ids[fwspec->num_ids + i] = ids[i]; | |
2001 | ||
2002 | fwspec->num_ids += num_ids; | |
57f98d2f RM |
2003 | return 0; |
2004 | } | |
2005 | EXPORT_SYMBOL_GPL(iommu_fwspec_add_ids); |