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