Commit | Line | Data |
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fc2100eb JR |
1 | /* |
2 | * Copyright (C) 2007-2008 Advanced Micro Devices, Inc. | |
63ce3ae8 | 3 | * Author: Joerg Roedel <jroedel@suse.de> |
fc2100eb JR |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License version 2 as published | |
7 | * by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
17 | */ | |
18 | ||
92e7066f | 19 | #define pr_fmt(fmt) "iommu: " fmt |
7d3002cc | 20 | |
905d66c1 | 21 | #include <linux/device.h> |
40998188 | 22 | #include <linux/kernel.h> |
fc2100eb JR |
23 | #include <linux/bug.h> |
24 | #include <linux/types.h> | |
60db4027 AM |
25 | #include <linux/module.h> |
26 | #include <linux/slab.h> | |
fc2100eb JR |
27 | #include <linux/errno.h> |
28 | #include <linux/iommu.h> | |
d72e31c9 AW |
29 | #include <linux/idr.h> |
30 | #include <linux/notifier.h> | |
31 | #include <linux/err.h> | |
104a1c13 | 32 | #include <linux/pci.h> |
f096c061 | 33 | #include <linux/bitops.h> |
57f98d2f | 34 | #include <linux/property.h> |
7f6db171 | 35 | #include <trace/events/iommu.h> |
d72e31c9 AW |
36 | |
37 | static struct kset *iommu_group_kset; | |
e38d1f13 | 38 | static DEFINE_IDA(iommu_group_ida); |
d72e31c9 | 39 | |
b22f6434 TR |
40 | struct iommu_callback_data { |
41 | const struct iommu_ops *ops; | |
42 | }; | |
43 | ||
d72e31c9 AW |
44 | struct iommu_group { |
45 | struct kobject kobj; | |
46 | struct kobject *devices_kobj; | |
47 | struct list_head devices; | |
48 | struct mutex mutex; | |
49 | struct blocking_notifier_head notifier; | |
50 | void *iommu_data; | |
51 | void (*iommu_data_release)(void *iommu_data); | |
52 | char *name; | |
53 | int id; | |
53723dc5 | 54 | struct iommu_domain *default_domain; |
e39cb8a3 | 55 | struct iommu_domain *domain; |
d72e31c9 AW |
56 | }; |
57 | ||
c09e22d5 | 58 | struct group_device { |
d72e31c9 AW |
59 | struct list_head list; |
60 | struct device *dev; | |
61 | char *name; | |
62 | }; | |
63 | ||
64 | struct iommu_group_attribute { | |
65 | struct attribute attr; | |
66 | ssize_t (*show)(struct iommu_group *group, char *buf); | |
67 | ssize_t (*store)(struct iommu_group *group, | |
68 | const char *buf, size_t count); | |
69 | }; | |
70 | ||
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 | 376 | int ret, i = 0; |
c09e22d5 | 377 | struct group_device *device; |
d72e31c9 AW |
378 | |
379 | device = kzalloc(sizeof(*device), GFP_KERNEL); | |
380 | if (!device) | |
381 | return -ENOMEM; | |
382 | ||
383 | device->dev = dev; | |
1460432c | 384 | |
d72e31c9 | 385 | ret = sysfs_create_link(&dev->kobj, &group->kobj, "iommu_group"); |
797a8b4d RM |
386 | if (ret) |
387 | goto err_free_device; | |
d72e31c9 AW |
388 | |
389 | device->name = kasprintf(GFP_KERNEL, "%s", kobject_name(&dev->kobj)); | |
390 | rename: | |
391 | if (!device->name) { | |
797a8b4d RM |
392 | ret = -ENOMEM; |
393 | goto err_remove_link; | |
d72e31c9 | 394 | } |
1460432c | 395 | |
d72e31c9 AW |
396 | ret = sysfs_create_link_nowarn(group->devices_kobj, |
397 | &dev->kobj, device->name); | |
398 | if (ret) { | |
d72e31c9 AW |
399 | if (ret == -EEXIST && i >= 0) { |
400 | /* | |
401 | * Account for the slim chance of collision | |
402 | * and append an instance to the name. | |
403 | */ | |
797a8b4d | 404 | kfree(device->name); |
d72e31c9 AW |
405 | device->name = kasprintf(GFP_KERNEL, "%s.%d", |
406 | kobject_name(&dev->kobj), i++); | |
407 | goto rename; | |
408 | } | |
797a8b4d | 409 | goto err_free_name; |
d72e31c9 AW |
410 | } |
411 | ||
412 | kobject_get(group->devices_kobj); | |
413 | ||
414 | dev->iommu_group = group; | |
415 | ||
beed2821 JR |
416 | iommu_group_create_direct_mappings(group, dev); |
417 | ||
d72e31c9 AW |
418 | mutex_lock(&group->mutex); |
419 | list_add_tail(&device->list, &group->devices); | |
e39cb8a3 | 420 | if (group->domain) |
797a8b4d | 421 | ret = __iommu_attach_device(group->domain, dev); |
d72e31c9 | 422 | mutex_unlock(&group->mutex); |
797a8b4d RM |
423 | if (ret) |
424 | goto err_put_group; | |
d72e31c9 AW |
425 | |
426 | /* Notify any listeners about change to group. */ | |
427 | blocking_notifier_call_chain(&group->notifier, | |
428 | IOMMU_GROUP_NOTIFY_ADD_DEVICE, dev); | |
d1cf7e82 SK |
429 | |
430 | trace_add_device_to_group(group->id, dev); | |
269aa808 JR |
431 | |
432 | pr_info("Adding device %s to group %d\n", dev_name(dev), group->id); | |
433 | ||
1460432c | 434 | return 0; |
797a8b4d RM |
435 | |
436 | err_put_group: | |
437 | mutex_lock(&group->mutex); | |
438 | list_del(&device->list); | |
439 | mutex_unlock(&group->mutex); | |
440 | dev->iommu_group = NULL; | |
441 | kobject_put(group->devices_kobj); | |
442 | err_free_name: | |
443 | kfree(device->name); | |
444 | err_remove_link: | |
445 | sysfs_remove_link(&dev->kobj, "iommu_group"); | |
446 | err_free_device: | |
447 | kfree(device); | |
448 | pr_err("Failed to add device %s to group %d: %d\n", dev_name(dev), group->id, ret); | |
449 | return ret; | |
1460432c | 450 | } |
d72e31c9 | 451 | EXPORT_SYMBOL_GPL(iommu_group_add_device); |
1460432c | 452 | |
d72e31c9 AW |
453 | /** |
454 | * iommu_group_remove_device - remove a device from it's current group | |
455 | * @dev: device to be removed | |
456 | * | |
457 | * This function is called by an iommu driver to remove the device from | |
458 | * it's current group. This decrements the iommu group reference count. | |
459 | */ | |
460 | void iommu_group_remove_device(struct device *dev) | |
461 | { | |
462 | struct iommu_group *group = dev->iommu_group; | |
c09e22d5 | 463 | struct group_device *tmp_device, *device = NULL; |
d72e31c9 | 464 | |
269aa808 JR |
465 | pr_info("Removing device %s from group %d\n", dev_name(dev), group->id); |
466 | ||
d72e31c9 AW |
467 | /* Pre-notify listeners that a device is being removed. */ |
468 | blocking_notifier_call_chain(&group->notifier, | |
469 | IOMMU_GROUP_NOTIFY_DEL_DEVICE, dev); | |
470 | ||
471 | mutex_lock(&group->mutex); | |
472 | list_for_each_entry(tmp_device, &group->devices, list) { | |
473 | if (tmp_device->dev == dev) { | |
474 | device = tmp_device; | |
475 | list_del(&device->list); | |
476 | break; | |
477 | } | |
478 | } | |
479 | mutex_unlock(&group->mutex); | |
480 | ||
481 | if (!device) | |
482 | return; | |
483 | ||
484 | sysfs_remove_link(group->devices_kobj, device->name); | |
485 | sysfs_remove_link(&dev->kobj, "iommu_group"); | |
486 | ||
2e757086 SK |
487 | trace_remove_device_from_group(group->id, dev); |
488 | ||
d72e31c9 AW |
489 | kfree(device->name); |
490 | kfree(device); | |
491 | dev->iommu_group = NULL; | |
492 | kobject_put(group->devices_kobj); | |
493 | } | |
494 | EXPORT_SYMBOL_GPL(iommu_group_remove_device); | |
495 | ||
426a2738 JR |
496 | static int iommu_group_device_count(struct iommu_group *group) |
497 | { | |
c09e22d5 | 498 | struct group_device *entry; |
426a2738 JR |
499 | int ret = 0; |
500 | ||
501 | list_for_each_entry(entry, &group->devices, list) | |
502 | ret++; | |
503 | ||
504 | return ret; | |
505 | } | |
506 | ||
d72e31c9 AW |
507 | /** |
508 | * iommu_group_for_each_dev - iterate over each device in the group | |
509 | * @group: the group | |
510 | * @data: caller opaque data to be passed to callback function | |
511 | * @fn: caller supplied callback function | |
512 | * | |
513 | * This function is called by group users to iterate over group devices. | |
514 | * Callers should hold a reference count to the group during callback. | |
515 | * The group->mutex is held across callbacks, which will block calls to | |
516 | * iommu_group_add/remove_device. | |
517 | */ | |
e39cb8a3 JR |
518 | static int __iommu_group_for_each_dev(struct iommu_group *group, void *data, |
519 | int (*fn)(struct device *, void *)) | |
d72e31c9 | 520 | { |
c09e22d5 | 521 | struct group_device *device; |
d72e31c9 AW |
522 | int ret = 0; |
523 | ||
d72e31c9 AW |
524 | list_for_each_entry(device, &group->devices, list) { |
525 | ret = fn(device->dev, data); | |
526 | if (ret) | |
527 | break; | |
528 | } | |
e39cb8a3 JR |
529 | return ret; |
530 | } | |
531 | ||
532 | ||
533 | int iommu_group_for_each_dev(struct iommu_group *group, void *data, | |
534 | int (*fn)(struct device *, void *)) | |
535 | { | |
536 | int ret; | |
537 | ||
538 | mutex_lock(&group->mutex); | |
539 | ret = __iommu_group_for_each_dev(group, data, fn); | |
d72e31c9 | 540 | mutex_unlock(&group->mutex); |
e39cb8a3 | 541 | |
d72e31c9 AW |
542 | return ret; |
543 | } | |
544 | EXPORT_SYMBOL_GPL(iommu_group_for_each_dev); | |
545 | ||
546 | /** | |
547 | * iommu_group_get - Return the group for a device and increment reference | |
548 | * @dev: get the group that this device belongs to | |
549 | * | |
550 | * This function is called by iommu drivers and users to get the group | |
551 | * for the specified device. If found, the group is returned and the group | |
552 | * reference in incremented, else NULL. | |
553 | */ | |
554 | struct iommu_group *iommu_group_get(struct device *dev) | |
555 | { | |
556 | struct iommu_group *group = dev->iommu_group; | |
557 | ||
558 | if (group) | |
559 | kobject_get(group->devices_kobj); | |
560 | ||
561 | return group; | |
562 | } | |
563 | EXPORT_SYMBOL_GPL(iommu_group_get); | |
564 | ||
13f59a78 RM |
565 | /** |
566 | * iommu_group_ref_get - Increment reference on a group | |
567 | * @group: the group to use, must not be NULL | |
568 | * | |
569 | * This function is called by iommu drivers to take additional references on an | |
570 | * existing group. Returns the given group for convenience. | |
571 | */ | |
572 | struct iommu_group *iommu_group_ref_get(struct iommu_group *group) | |
573 | { | |
574 | kobject_get(group->devices_kobj); | |
575 | return group; | |
576 | } | |
577 | ||
d72e31c9 AW |
578 | /** |
579 | * iommu_group_put - Decrement group reference | |
580 | * @group: the group to use | |
581 | * | |
582 | * This function is called by iommu drivers and users to release the | |
583 | * iommu group. Once the reference count is zero, the group is released. | |
584 | */ | |
585 | void iommu_group_put(struct iommu_group *group) | |
586 | { | |
587 | if (group) | |
588 | kobject_put(group->devices_kobj); | |
589 | } | |
590 | EXPORT_SYMBOL_GPL(iommu_group_put); | |
591 | ||
592 | /** | |
593 | * iommu_group_register_notifier - Register a notifier for group changes | |
594 | * @group: the group to watch | |
595 | * @nb: notifier block to signal | |
596 | * | |
597 | * This function allows iommu group users to track changes in a group. | |
598 | * See include/linux/iommu.h for actions sent via this notifier. Caller | |
599 | * should hold a reference to the group throughout notifier registration. | |
600 | */ | |
601 | int iommu_group_register_notifier(struct iommu_group *group, | |
602 | struct notifier_block *nb) | |
603 | { | |
604 | return blocking_notifier_chain_register(&group->notifier, nb); | |
605 | } | |
606 | EXPORT_SYMBOL_GPL(iommu_group_register_notifier); | |
607 | ||
608 | /** | |
609 | * iommu_group_unregister_notifier - Unregister a notifier | |
610 | * @group: the group to watch | |
611 | * @nb: notifier block to signal | |
612 | * | |
613 | * Unregister a previously registered group notifier block. | |
614 | */ | |
615 | int iommu_group_unregister_notifier(struct iommu_group *group, | |
616 | struct notifier_block *nb) | |
617 | { | |
618 | return blocking_notifier_chain_unregister(&group->notifier, nb); | |
619 | } | |
620 | EXPORT_SYMBOL_GPL(iommu_group_unregister_notifier); | |
621 | ||
622 | /** | |
623 | * iommu_group_id - Return ID for a group | |
624 | * @group: the group to ID | |
625 | * | |
626 | * Return the unique ID for the group matching the sysfs group number. | |
627 | */ | |
628 | int iommu_group_id(struct iommu_group *group) | |
629 | { | |
630 | return group->id; | |
631 | } | |
632 | EXPORT_SYMBOL_GPL(iommu_group_id); | |
1460432c | 633 | |
f096c061 AW |
634 | static struct iommu_group *get_pci_alias_group(struct pci_dev *pdev, |
635 | unsigned long *devfns); | |
636 | ||
104a1c13 AW |
637 | /* |
638 | * To consider a PCI device isolated, we require ACS to support Source | |
639 | * Validation, Request Redirection, Completer Redirection, and Upstream | |
640 | * Forwarding. This effectively means that devices cannot spoof their | |
641 | * requester ID, requests and completions cannot be redirected, and all | |
642 | * transactions are forwarded upstream, even as it passes through a | |
643 | * bridge where the target device is downstream. | |
644 | */ | |
645 | #define REQ_ACS_FLAGS (PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF) | |
646 | ||
f096c061 AW |
647 | /* |
648 | * For multifunction devices which are not isolated from each other, find | |
649 | * all the other non-isolated functions and look for existing groups. For | |
650 | * each function, we also need to look for aliases to or from other devices | |
651 | * that may already have a group. | |
652 | */ | |
653 | static struct iommu_group *get_pci_function_alias_group(struct pci_dev *pdev, | |
654 | unsigned long *devfns) | |
655 | { | |
656 | struct pci_dev *tmp = NULL; | |
657 | struct iommu_group *group; | |
658 | ||
659 | if (!pdev->multifunction || pci_acs_enabled(pdev, REQ_ACS_FLAGS)) | |
660 | return NULL; | |
661 | ||
662 | for_each_pci_dev(tmp) { | |
663 | if (tmp == pdev || tmp->bus != pdev->bus || | |
664 | PCI_SLOT(tmp->devfn) != PCI_SLOT(pdev->devfn) || | |
665 | pci_acs_enabled(tmp, REQ_ACS_FLAGS)) | |
666 | continue; | |
667 | ||
668 | group = get_pci_alias_group(tmp, devfns); | |
669 | if (group) { | |
670 | pci_dev_put(tmp); | |
671 | return group; | |
672 | } | |
673 | } | |
674 | ||
675 | return NULL; | |
676 | } | |
677 | ||
678 | /* | |
338c3149 JL |
679 | * Look for aliases to or from the given device for existing groups. DMA |
680 | * aliases are only supported on the same bus, therefore the search | |
f096c061 AW |
681 | * space is quite small (especially since we're really only looking at pcie |
682 | * device, and therefore only expect multiple slots on the root complex or | |
683 | * downstream switch ports). It's conceivable though that a pair of | |
684 | * multifunction devices could have aliases between them that would cause a | |
685 | * loop. To prevent this, we use a bitmap to track where we've been. | |
686 | */ | |
687 | static struct iommu_group *get_pci_alias_group(struct pci_dev *pdev, | |
688 | unsigned long *devfns) | |
689 | { | |
690 | struct pci_dev *tmp = NULL; | |
691 | struct iommu_group *group; | |
692 | ||
693 | if (test_and_set_bit(pdev->devfn & 0xff, devfns)) | |
694 | return NULL; | |
695 | ||
696 | group = iommu_group_get(&pdev->dev); | |
697 | if (group) | |
698 | return group; | |
699 | ||
700 | for_each_pci_dev(tmp) { | |
701 | if (tmp == pdev || tmp->bus != pdev->bus) | |
702 | continue; | |
703 | ||
704 | /* We alias them or they alias us */ | |
338c3149 | 705 | if (pci_devs_are_dma_aliases(pdev, tmp)) { |
f096c061 AW |
706 | group = get_pci_alias_group(tmp, devfns); |
707 | if (group) { | |
708 | pci_dev_put(tmp); | |
709 | return group; | |
710 | } | |
711 | ||
712 | group = get_pci_function_alias_group(tmp, devfns); | |
713 | if (group) { | |
714 | pci_dev_put(tmp); | |
715 | return group; | |
716 | } | |
717 | } | |
718 | } | |
719 | ||
720 | return NULL; | |
721 | } | |
722 | ||
104a1c13 AW |
723 | struct group_for_pci_data { |
724 | struct pci_dev *pdev; | |
725 | struct iommu_group *group; | |
726 | }; | |
727 | ||
728 | /* | |
729 | * DMA alias iterator callback, return the last seen device. Stop and return | |
730 | * the IOMMU group if we find one along the way. | |
731 | */ | |
732 | static int get_pci_alias_or_group(struct pci_dev *pdev, u16 alias, void *opaque) | |
733 | { | |
734 | struct group_for_pci_data *data = opaque; | |
735 | ||
736 | data->pdev = pdev; | |
737 | data->group = iommu_group_get(&pdev->dev); | |
738 | ||
739 | return data->group != NULL; | |
740 | } | |
741 | ||
6eab556a JR |
742 | /* |
743 | * Generic device_group call-back function. It just allocates one | |
744 | * iommu-group per device. | |
745 | */ | |
746 | struct iommu_group *generic_device_group(struct device *dev) | |
747 | { | |
748 | struct iommu_group *group; | |
749 | ||
750 | group = iommu_group_alloc(); | |
751 | if (IS_ERR(group)) | |
752 | return NULL; | |
753 | ||
754 | return group; | |
755 | } | |
756 | ||
104a1c13 AW |
757 | /* |
758 | * Use standard PCI bus topology, isolation features, and DMA alias quirks | |
759 | * to find or create an IOMMU group for a device. | |
760 | */ | |
5e62292b | 761 | struct iommu_group *pci_device_group(struct device *dev) |
104a1c13 | 762 | { |
5e62292b | 763 | struct pci_dev *pdev = to_pci_dev(dev); |
104a1c13 AW |
764 | struct group_for_pci_data data; |
765 | struct pci_bus *bus; | |
766 | struct iommu_group *group = NULL; | |
f096c061 | 767 | u64 devfns[4] = { 0 }; |
104a1c13 | 768 | |
5e62292b JR |
769 | if (WARN_ON(!dev_is_pci(dev))) |
770 | return ERR_PTR(-EINVAL); | |
771 | ||
104a1c13 AW |
772 | /* |
773 | * Find the upstream DMA alias for the device. A device must not | |
774 | * be aliased due to topology in order to have its own IOMMU group. | |
775 | * If we find an alias along the way that already belongs to a | |
776 | * group, use it. | |
777 | */ | |
778 | if (pci_for_each_dma_alias(pdev, get_pci_alias_or_group, &data)) | |
779 | return data.group; | |
780 | ||
781 | pdev = data.pdev; | |
782 | ||
783 | /* | |
784 | * Continue upstream from the point of minimum IOMMU granularity | |
785 | * due to aliases to the point where devices are protected from | |
786 | * peer-to-peer DMA by PCI ACS. Again, if we find an existing | |
787 | * group, use it. | |
788 | */ | |
789 | for (bus = pdev->bus; !pci_is_root_bus(bus); bus = bus->parent) { | |
790 | if (!bus->self) | |
791 | continue; | |
792 | ||
793 | if (pci_acs_path_enabled(bus->self, NULL, REQ_ACS_FLAGS)) | |
794 | break; | |
795 | ||
796 | pdev = bus->self; | |
797 | ||
798 | group = iommu_group_get(&pdev->dev); | |
799 | if (group) | |
800 | return group; | |
801 | } | |
802 | ||
803 | /* | |
f096c061 AW |
804 | * Look for existing groups on device aliases. If we alias another |
805 | * device or another device aliases us, use the same group. | |
104a1c13 | 806 | */ |
f096c061 AW |
807 | group = get_pci_alias_group(pdev, (unsigned long *)devfns); |
808 | if (group) | |
809 | return group; | |
104a1c13 AW |
810 | |
811 | /* | |
f096c061 AW |
812 | * Look for existing groups on non-isolated functions on the same |
813 | * slot and aliases of those funcions, if any. No need to clear | |
814 | * the search bitmap, the tested devfns are still valid. | |
104a1c13 | 815 | */ |
f096c061 AW |
816 | group = get_pci_function_alias_group(pdev, (unsigned long *)devfns); |
817 | if (group) | |
818 | return group; | |
104a1c13 AW |
819 | |
820 | /* No shared group found, allocate new */ | |
53723dc5 | 821 | group = iommu_group_alloc(); |
409e553d DC |
822 | if (IS_ERR(group)) |
823 | return NULL; | |
824 | ||
53723dc5 | 825 | return group; |
104a1c13 AW |
826 | } |
827 | ||
828 | /** | |
829 | * iommu_group_get_for_dev - Find or create the IOMMU group for a device | |
830 | * @dev: target device | |
831 | * | |
832 | * This function is intended to be called by IOMMU drivers and extended to | |
833 | * support common, bus-defined algorithms when determining or creating the | |
834 | * IOMMU group for a device. On success, the caller will hold a reference | |
835 | * to the returned IOMMU group, which will already include the provided | |
836 | * device. The reference should be released with iommu_group_put(). | |
837 | */ | |
838 | struct iommu_group *iommu_group_get_for_dev(struct device *dev) | |
839 | { | |
46c6b2bc | 840 | const struct iommu_ops *ops = dev->bus->iommu_ops; |
c4a783b8 | 841 | struct iommu_group *group; |
104a1c13 AW |
842 | int ret; |
843 | ||
844 | group = iommu_group_get(dev); | |
845 | if (group) | |
846 | return group; | |
847 | ||
46c6b2bc | 848 | group = ERR_PTR(-EINVAL); |
c4a783b8 | 849 | |
46c6b2bc JR |
850 | if (ops && ops->device_group) |
851 | group = ops->device_group(dev); | |
104a1c13 AW |
852 | |
853 | if (IS_ERR(group)) | |
854 | return group; | |
855 | ||
1228236d JR |
856 | /* |
857 | * Try to allocate a default domain - needs support from the | |
858 | * IOMMU driver. | |
859 | */ | |
860 | if (!group->default_domain) { | |
861 | group->default_domain = __iommu_domain_alloc(dev->bus, | |
862 | IOMMU_DOMAIN_DMA); | |
eebb8034 JR |
863 | if (!group->domain) |
864 | group->domain = group->default_domain; | |
1228236d JR |
865 | } |
866 | ||
104a1c13 AW |
867 | ret = iommu_group_add_device(group, dev); |
868 | if (ret) { | |
869 | iommu_group_put(group); | |
870 | return ERR_PTR(ret); | |
871 | } | |
872 | ||
873 | return group; | |
874 | } | |
875 | ||
6827ca83 JR |
876 | struct iommu_domain *iommu_group_default_domain(struct iommu_group *group) |
877 | { | |
878 | return group->default_domain; | |
879 | } | |
880 | ||
d72e31c9 | 881 | static int add_iommu_group(struct device *dev, void *data) |
1460432c | 882 | { |
b22f6434 TR |
883 | struct iommu_callback_data *cb = data; |
884 | const struct iommu_ops *ops = cb->ops; | |
38667f18 | 885 | int ret; |
d72e31c9 AW |
886 | |
887 | if (!ops->add_device) | |
461bfb3f | 888 | return 0; |
1460432c | 889 | |
d72e31c9 AW |
890 | WARN_ON(dev->iommu_group); |
891 | ||
38667f18 JR |
892 | ret = ops->add_device(dev); |
893 | ||
894 | /* | |
895 | * We ignore -ENODEV errors for now, as they just mean that the | |
896 | * device is not translated by an IOMMU. We still care about | |
897 | * other errors and fail to initialize when they happen. | |
898 | */ | |
899 | if (ret == -ENODEV) | |
900 | ret = 0; | |
901 | ||
902 | return ret; | |
1460432c AW |
903 | } |
904 | ||
8da30142 JR |
905 | static int remove_iommu_group(struct device *dev, void *data) |
906 | { | |
907 | struct iommu_callback_data *cb = data; | |
908 | const struct iommu_ops *ops = cb->ops; | |
909 | ||
910 | if (ops->remove_device && dev->iommu_group) | |
911 | ops->remove_device(dev); | |
1460432c AW |
912 | |
913 | return 0; | |
914 | } | |
915 | ||
d72e31c9 AW |
916 | static int iommu_bus_notifier(struct notifier_block *nb, |
917 | unsigned long action, void *data) | |
1460432c AW |
918 | { |
919 | struct device *dev = data; | |
b22f6434 | 920 | const struct iommu_ops *ops = dev->bus->iommu_ops; |
d72e31c9 AW |
921 | struct iommu_group *group; |
922 | unsigned long group_action = 0; | |
923 | ||
924 | /* | |
925 | * ADD/DEL call into iommu driver ops if provided, which may | |
926 | * result in ADD/DEL notifiers to group->notifier | |
927 | */ | |
928 | if (action == BUS_NOTIFY_ADD_DEVICE) { | |
929 | if (ops->add_device) | |
930 | return ops->add_device(dev); | |
843cb6dc | 931 | } else if (action == BUS_NOTIFY_REMOVED_DEVICE) { |
d72e31c9 AW |
932 | if (ops->remove_device && dev->iommu_group) { |
933 | ops->remove_device(dev); | |
934 | return 0; | |
935 | } | |
936 | } | |
1460432c | 937 | |
d72e31c9 AW |
938 | /* |
939 | * Remaining BUS_NOTIFYs get filtered and republished to the | |
940 | * group, if anyone is listening | |
941 | */ | |
942 | group = iommu_group_get(dev); | |
943 | if (!group) | |
944 | return 0; | |
1460432c | 945 | |
d72e31c9 AW |
946 | switch (action) { |
947 | case BUS_NOTIFY_BIND_DRIVER: | |
948 | group_action = IOMMU_GROUP_NOTIFY_BIND_DRIVER; | |
949 | break; | |
950 | case BUS_NOTIFY_BOUND_DRIVER: | |
951 | group_action = IOMMU_GROUP_NOTIFY_BOUND_DRIVER; | |
952 | break; | |
953 | case BUS_NOTIFY_UNBIND_DRIVER: | |
954 | group_action = IOMMU_GROUP_NOTIFY_UNBIND_DRIVER; | |
955 | break; | |
956 | case BUS_NOTIFY_UNBOUND_DRIVER: | |
957 | group_action = IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER; | |
958 | break; | |
959 | } | |
1460432c | 960 | |
d72e31c9 AW |
961 | if (group_action) |
962 | blocking_notifier_call_chain(&group->notifier, | |
963 | group_action, dev); | |
1460432c | 964 | |
d72e31c9 | 965 | iommu_group_put(group); |
1460432c AW |
966 | return 0; |
967 | } | |
968 | ||
fb3e3065 | 969 | static int iommu_bus_init(struct bus_type *bus, const struct iommu_ops *ops) |
ff21776d | 970 | { |
fb3e3065 MS |
971 | int err; |
972 | struct notifier_block *nb; | |
b22f6434 TR |
973 | struct iommu_callback_data cb = { |
974 | .ops = ops, | |
975 | }; | |
976 | ||
fb3e3065 MS |
977 | nb = kzalloc(sizeof(struct notifier_block), GFP_KERNEL); |
978 | if (!nb) | |
979 | return -ENOMEM; | |
980 | ||
981 | nb->notifier_call = iommu_bus_notifier; | |
982 | ||
983 | err = bus_register_notifier(bus, nb); | |
8da30142 JR |
984 | if (err) |
985 | goto out_free; | |
d7da6bdc HS |
986 | |
987 | err = bus_for_each_dev(bus, NULL, &cb, add_iommu_group); | |
8da30142 JR |
988 | if (err) |
989 | goto out_err; | |
990 | ||
d7da6bdc HS |
991 | |
992 | return 0; | |
8da30142 JR |
993 | |
994 | out_err: | |
995 | /* Clean up */ | |
996 | bus_for_each_dev(bus, NULL, &cb, remove_iommu_group); | |
997 | bus_unregister_notifier(bus, nb); | |
998 | ||
999 | out_free: | |
1000 | kfree(nb); | |
1001 | ||
1002 | return err; | |
ff21776d | 1003 | } |
fc2100eb | 1004 | |
ff21776d JR |
1005 | /** |
1006 | * bus_set_iommu - set iommu-callbacks for the bus | |
1007 | * @bus: bus. | |
1008 | * @ops: the callbacks provided by the iommu-driver | |
1009 | * | |
1010 | * This function is called by an iommu driver to set the iommu methods | |
1011 | * used for a particular bus. Drivers for devices on that bus can use | |
1012 | * the iommu-api after these ops are registered. | |
1013 | * This special function is needed because IOMMUs are usually devices on | |
1014 | * the bus itself, so the iommu drivers are not initialized when the bus | |
1015 | * is set up. With this function the iommu-driver can set the iommu-ops | |
1016 | * afterwards. | |
1017 | */ | |
b22f6434 | 1018 | int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops) |
fc2100eb | 1019 | { |
d7da6bdc HS |
1020 | int err; |
1021 | ||
ff21776d JR |
1022 | if (bus->iommu_ops != NULL) |
1023 | return -EBUSY; | |
fc2100eb | 1024 | |
ff21776d JR |
1025 | bus->iommu_ops = ops; |
1026 | ||
1027 | /* Do IOMMU specific setup for this bus-type */ | |
d7da6bdc HS |
1028 | err = iommu_bus_init(bus, ops); |
1029 | if (err) | |
1030 | bus->iommu_ops = NULL; | |
1031 | ||
1032 | return err; | |
fc2100eb | 1033 | } |
ff21776d | 1034 | EXPORT_SYMBOL_GPL(bus_set_iommu); |
fc2100eb | 1035 | |
a1b60c1c | 1036 | bool iommu_present(struct bus_type *bus) |
fc2100eb | 1037 | { |
94441c3b | 1038 | return bus->iommu_ops != NULL; |
fc2100eb | 1039 | } |
a1b60c1c | 1040 | EXPORT_SYMBOL_GPL(iommu_present); |
fc2100eb | 1041 | |
3c0e0ca0 JR |
1042 | bool iommu_capable(struct bus_type *bus, enum iommu_cap cap) |
1043 | { | |
1044 | if (!bus->iommu_ops || !bus->iommu_ops->capable) | |
1045 | return false; | |
1046 | ||
1047 | return bus->iommu_ops->capable(cap); | |
1048 | } | |
1049 | EXPORT_SYMBOL_GPL(iommu_capable); | |
1050 | ||
4f3f8d9d OBC |
1051 | /** |
1052 | * iommu_set_fault_handler() - set a fault handler for an iommu domain | |
1053 | * @domain: iommu domain | |
1054 | * @handler: fault handler | |
77ca2332 | 1055 | * @token: user data, will be passed back to the fault handler |
0ed6d2d2 OBC |
1056 | * |
1057 | * This function should be used by IOMMU users which want to be notified | |
1058 | * whenever an IOMMU fault happens. | |
1059 | * | |
1060 | * The fault handler itself should return 0 on success, and an appropriate | |
1061 | * error code otherwise. | |
4f3f8d9d OBC |
1062 | */ |
1063 | void iommu_set_fault_handler(struct iommu_domain *domain, | |
77ca2332 OBC |
1064 | iommu_fault_handler_t handler, |
1065 | void *token) | |
4f3f8d9d OBC |
1066 | { |
1067 | BUG_ON(!domain); | |
1068 | ||
1069 | domain->handler = handler; | |
77ca2332 | 1070 | domain->handler_token = token; |
4f3f8d9d | 1071 | } |
30bd918c | 1072 | EXPORT_SYMBOL_GPL(iommu_set_fault_handler); |
4f3f8d9d | 1073 | |
53723dc5 JR |
1074 | static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus, |
1075 | unsigned type) | |
fc2100eb JR |
1076 | { |
1077 | struct iommu_domain *domain; | |
fc2100eb | 1078 | |
94441c3b | 1079 | if (bus == NULL || bus->iommu_ops == NULL) |
905d66c1 JR |
1080 | return NULL; |
1081 | ||
53723dc5 | 1082 | domain = bus->iommu_ops->domain_alloc(type); |
fc2100eb JR |
1083 | if (!domain) |
1084 | return NULL; | |
1085 | ||
8539c7c1 | 1086 | domain->ops = bus->iommu_ops; |
53723dc5 | 1087 | domain->type = type; |
d16e0faa RM |
1088 | /* Assume all sizes by default; the driver may override this later */ |
1089 | domain->pgsize_bitmap = bus->iommu_ops->pgsize_bitmap; | |
905d66c1 | 1090 | |
fc2100eb | 1091 | return domain; |
fc2100eb | 1092 | } |
fc2100eb | 1093 | |
53723dc5 JR |
1094 | struct iommu_domain *iommu_domain_alloc(struct bus_type *bus) |
1095 | { | |
1096 | return __iommu_domain_alloc(bus, IOMMU_DOMAIN_UNMANAGED); | |
fc2100eb JR |
1097 | } |
1098 | EXPORT_SYMBOL_GPL(iommu_domain_alloc); | |
1099 | ||
1100 | void iommu_domain_free(struct iommu_domain *domain) | |
1101 | { | |
89be34a1 | 1102 | domain->ops->domain_free(domain); |
fc2100eb JR |
1103 | } |
1104 | EXPORT_SYMBOL_GPL(iommu_domain_free); | |
1105 | ||
426a2738 JR |
1106 | static int __iommu_attach_device(struct iommu_domain *domain, |
1107 | struct device *dev) | |
fc2100eb | 1108 | { |
b54db778 | 1109 | int ret; |
e5aa7f00 JR |
1110 | if (unlikely(domain->ops->attach_dev == NULL)) |
1111 | return -ENODEV; | |
1112 | ||
b54db778 SK |
1113 | ret = domain->ops->attach_dev(domain, dev); |
1114 | if (!ret) | |
1115 | trace_attach_device_to_domain(dev); | |
1116 | return ret; | |
fc2100eb | 1117 | } |
426a2738 JR |
1118 | |
1119 | int iommu_attach_device(struct iommu_domain *domain, struct device *dev) | |
1120 | { | |
1121 | struct iommu_group *group; | |
1122 | int ret; | |
1123 | ||
1124 | group = iommu_group_get(dev); | |
1125 | /* FIXME: Remove this when groups a mandatory for iommu drivers */ | |
1126 | if (group == NULL) | |
1127 | return __iommu_attach_device(domain, dev); | |
1128 | ||
1129 | /* | |
1130 | * We have a group - lock it to make sure the device-count doesn't | |
1131 | * change while we are attaching | |
1132 | */ | |
1133 | mutex_lock(&group->mutex); | |
1134 | ret = -EINVAL; | |
1135 | if (iommu_group_device_count(group) != 1) | |
1136 | goto out_unlock; | |
1137 | ||
e39cb8a3 | 1138 | ret = __iommu_attach_group(domain, group); |
426a2738 JR |
1139 | |
1140 | out_unlock: | |
1141 | mutex_unlock(&group->mutex); | |
1142 | iommu_group_put(group); | |
1143 | ||
1144 | return ret; | |
1145 | } | |
fc2100eb JR |
1146 | EXPORT_SYMBOL_GPL(iommu_attach_device); |
1147 | ||
426a2738 JR |
1148 | static void __iommu_detach_device(struct iommu_domain *domain, |
1149 | struct device *dev) | |
fc2100eb | 1150 | { |
e5aa7f00 JR |
1151 | if (unlikely(domain->ops->detach_dev == NULL)) |
1152 | return; | |
1153 | ||
1154 | domain->ops->detach_dev(domain, dev); | |
69980630 | 1155 | trace_detach_device_from_domain(dev); |
fc2100eb | 1156 | } |
426a2738 JR |
1157 | |
1158 | void iommu_detach_device(struct iommu_domain *domain, struct device *dev) | |
1159 | { | |
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 __iommu_detach_device(domain, dev); | |
1166 | ||
1167 | mutex_lock(&group->mutex); | |
1168 | if (iommu_group_device_count(group) != 1) { | |
1169 | WARN_ON(1); | |
1170 | goto out_unlock; | |
1171 | } | |
1172 | ||
e39cb8a3 | 1173 | __iommu_detach_group(domain, group); |
426a2738 JR |
1174 | |
1175 | out_unlock: | |
1176 | mutex_unlock(&group->mutex); | |
1177 | iommu_group_put(group); | |
1178 | } | |
fc2100eb JR |
1179 | EXPORT_SYMBOL_GPL(iommu_detach_device); |
1180 | ||
2c1296d9 JR |
1181 | struct iommu_domain *iommu_get_domain_for_dev(struct device *dev) |
1182 | { | |
1183 | struct iommu_domain *domain; | |
1184 | struct iommu_group *group; | |
1185 | ||
1186 | group = iommu_group_get(dev); | |
1187 | /* FIXME: Remove this when groups a mandatory for iommu drivers */ | |
1188 | if (group == NULL) | |
1189 | return NULL; | |
1190 | ||
1191 | domain = group->domain; | |
1192 | ||
1193 | iommu_group_put(group); | |
1194 | ||
1195 | return domain; | |
1196 | } | |
1197 | EXPORT_SYMBOL_GPL(iommu_get_domain_for_dev); | |
fc2100eb | 1198 | |
d72e31c9 AW |
1199 | /* |
1200 | * IOMMU groups are really the natrual working unit of the IOMMU, but | |
1201 | * the IOMMU API works on domains and devices. Bridge that gap by | |
1202 | * iterating over the devices in a group. Ideally we'd have a single | |
1203 | * device which represents the requestor ID of the group, but we also | |
1204 | * allow IOMMU drivers to create policy defined minimum sets, where | |
1205 | * the physical hardware may be able to distiguish members, but we | |
1206 | * wish to group them at a higher level (ex. untrusted multi-function | |
1207 | * PCI devices). Thus we attach each device. | |
1208 | */ | |
1209 | static int iommu_group_do_attach_device(struct device *dev, void *data) | |
1210 | { | |
1211 | struct iommu_domain *domain = data; | |
1212 | ||
426a2738 | 1213 | return __iommu_attach_device(domain, dev); |
d72e31c9 AW |
1214 | } |
1215 | ||
e39cb8a3 JR |
1216 | static int __iommu_attach_group(struct iommu_domain *domain, |
1217 | struct iommu_group *group) | |
1218 | { | |
1219 | int ret; | |
1220 | ||
1221 | if (group->default_domain && group->domain != group->default_domain) | |
1222 | return -EBUSY; | |
1223 | ||
1224 | ret = __iommu_group_for_each_dev(group, domain, | |
1225 | iommu_group_do_attach_device); | |
1226 | if (ret == 0) | |
1227 | group->domain = domain; | |
1228 | ||
1229 | return ret; | |
d72e31c9 AW |
1230 | } |
1231 | ||
1232 | int iommu_attach_group(struct iommu_domain *domain, struct iommu_group *group) | |
1233 | { | |
e39cb8a3 JR |
1234 | int ret; |
1235 | ||
1236 | mutex_lock(&group->mutex); | |
1237 | ret = __iommu_attach_group(domain, group); | |
1238 | mutex_unlock(&group->mutex); | |
1239 | ||
1240 | return ret; | |
d72e31c9 AW |
1241 | } |
1242 | EXPORT_SYMBOL_GPL(iommu_attach_group); | |
1243 | ||
1244 | static int iommu_group_do_detach_device(struct device *dev, void *data) | |
1245 | { | |
1246 | struct iommu_domain *domain = data; | |
1247 | ||
426a2738 | 1248 | __iommu_detach_device(domain, dev); |
d72e31c9 AW |
1249 | |
1250 | return 0; | |
1251 | } | |
1252 | ||
e39cb8a3 JR |
1253 | static void __iommu_detach_group(struct iommu_domain *domain, |
1254 | struct iommu_group *group) | |
1255 | { | |
1256 | int ret; | |
1257 | ||
1258 | if (!group->default_domain) { | |
1259 | __iommu_group_for_each_dev(group, domain, | |
1260 | iommu_group_do_detach_device); | |
1261 | group->domain = NULL; | |
1262 | return; | |
1263 | } | |
1264 | ||
1265 | if (group->domain == group->default_domain) | |
1266 | return; | |
1267 | ||
1268 | /* Detach by re-attaching to the default domain */ | |
1269 | ret = __iommu_group_for_each_dev(group, group->default_domain, | |
1270 | iommu_group_do_attach_device); | |
1271 | if (ret != 0) | |
1272 | WARN_ON(1); | |
1273 | else | |
1274 | group->domain = group->default_domain; | |
1275 | } | |
1276 | ||
d72e31c9 AW |
1277 | void iommu_detach_group(struct iommu_domain *domain, struct iommu_group *group) |
1278 | { | |
e39cb8a3 JR |
1279 | mutex_lock(&group->mutex); |
1280 | __iommu_detach_group(domain, group); | |
1281 | mutex_unlock(&group->mutex); | |
d72e31c9 AW |
1282 | } |
1283 | EXPORT_SYMBOL_GPL(iommu_detach_group); | |
1284 | ||
bb5547ac | 1285 | phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova) |
fc2100eb | 1286 | { |
e5aa7f00 JR |
1287 | if (unlikely(domain->ops->iova_to_phys == NULL)) |
1288 | return 0; | |
1289 | ||
1290 | return domain->ops->iova_to_phys(domain, iova); | |
fc2100eb JR |
1291 | } |
1292 | EXPORT_SYMBOL_GPL(iommu_iova_to_phys); | |
dbb9fd86 | 1293 | |
bd13969b AW |
1294 | static size_t iommu_pgsize(struct iommu_domain *domain, |
1295 | unsigned long addr_merge, size_t size) | |
1296 | { | |
1297 | unsigned int pgsize_idx; | |
1298 | size_t pgsize; | |
1299 | ||
1300 | /* Max page size that still fits into 'size' */ | |
1301 | pgsize_idx = __fls(size); | |
1302 | ||
1303 | /* need to consider alignment requirements ? */ | |
1304 | if (likely(addr_merge)) { | |
1305 | /* Max page size allowed by address */ | |
1306 | unsigned int align_pgsize_idx = __ffs(addr_merge); | |
1307 | pgsize_idx = min(pgsize_idx, align_pgsize_idx); | |
1308 | } | |
1309 | ||
1310 | /* build a mask of acceptable page sizes */ | |
1311 | pgsize = (1UL << (pgsize_idx + 1)) - 1; | |
1312 | ||
1313 | /* throw away page sizes not supported by the hardware */ | |
d16e0faa | 1314 | pgsize &= domain->pgsize_bitmap; |
bd13969b AW |
1315 | |
1316 | /* make sure we're still sane */ | |
1317 | BUG_ON(!pgsize); | |
1318 | ||
1319 | /* pick the biggest page */ | |
1320 | pgsize_idx = __fls(pgsize); | |
1321 | pgsize = 1UL << pgsize_idx; | |
1322 | ||
1323 | return pgsize; | |
1324 | } | |
1325 | ||
cefc53c7 | 1326 | int iommu_map(struct iommu_domain *domain, unsigned long iova, |
7d3002cc | 1327 | phys_addr_t paddr, size_t size, int prot) |
cefc53c7 | 1328 | { |
7d3002cc OBC |
1329 | unsigned long orig_iova = iova; |
1330 | unsigned int min_pagesz; | |
1331 | size_t orig_size = size; | |
06bfcaa9 | 1332 | phys_addr_t orig_paddr = paddr; |
7d3002cc | 1333 | int ret = 0; |
cefc53c7 | 1334 | |
9db4ad91 | 1335 | if (unlikely(domain->ops->map == NULL || |
d16e0faa | 1336 | domain->pgsize_bitmap == 0UL)) |
e5aa7f00 | 1337 | return -ENODEV; |
cefc53c7 | 1338 | |
a10315e5 JR |
1339 | if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING))) |
1340 | return -EINVAL; | |
1341 | ||
7d3002cc | 1342 | /* find out the minimum page size supported */ |
d16e0faa | 1343 | min_pagesz = 1 << __ffs(domain->pgsize_bitmap); |
7d3002cc OBC |
1344 | |
1345 | /* | |
1346 | * both the virtual address and the physical one, as well as | |
1347 | * the size of the mapping, must be aligned (at least) to the | |
1348 | * size of the smallest page supported by the hardware | |
1349 | */ | |
1350 | if (!IS_ALIGNED(iova | paddr | size, min_pagesz)) { | |
abedb049 | 1351 | pr_err("unaligned: iova 0x%lx pa %pa size 0x%zx min_pagesz 0x%x\n", |
6197ca82 | 1352 | iova, &paddr, size, min_pagesz); |
7d3002cc OBC |
1353 | return -EINVAL; |
1354 | } | |
1355 | ||
abedb049 | 1356 | pr_debug("map: iova 0x%lx pa %pa size 0x%zx\n", iova, &paddr, size); |
7d3002cc OBC |
1357 | |
1358 | while (size) { | |
bd13969b | 1359 | size_t pgsize = iommu_pgsize(domain, iova | paddr, size); |
7d3002cc | 1360 | |
abedb049 | 1361 | pr_debug("mapping: iova 0x%lx pa %pa pgsize 0x%zx\n", |
6197ca82 | 1362 | iova, &paddr, pgsize); |
7d3002cc OBC |
1363 | |
1364 | ret = domain->ops->map(domain, iova, paddr, pgsize, prot); | |
1365 | if (ret) | |
1366 | break; | |
1367 | ||
1368 | iova += pgsize; | |
1369 | paddr += pgsize; | |
1370 | size -= pgsize; | |
1371 | } | |
1372 | ||
1373 | /* unroll mapping in case something went wrong */ | |
1374 | if (ret) | |
1375 | iommu_unmap(domain, orig_iova, orig_size - size); | |
e0be7c86 | 1376 | else |
06bfcaa9 | 1377 | trace_map(orig_iova, orig_paddr, orig_size); |
7d3002cc OBC |
1378 | |
1379 | return ret; | |
cefc53c7 JR |
1380 | } |
1381 | EXPORT_SYMBOL_GPL(iommu_map); | |
1382 | ||
7d3002cc | 1383 | size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova, size_t size) |
cefc53c7 | 1384 | { |
7d3002cc OBC |
1385 | size_t unmapped_page, unmapped = 0; |
1386 | unsigned int min_pagesz; | |
6fd492fd | 1387 | unsigned long orig_iova = iova; |
cefc53c7 | 1388 | |
57886518 | 1389 | if (unlikely(domain->ops->unmap == NULL || |
d16e0faa | 1390 | domain->pgsize_bitmap == 0UL)) |
e5aa7f00 JR |
1391 | return -ENODEV; |
1392 | ||
a10315e5 JR |
1393 | if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING))) |
1394 | return -EINVAL; | |
1395 | ||
7d3002cc | 1396 | /* find out the minimum page size supported */ |
d16e0faa | 1397 | min_pagesz = 1 << __ffs(domain->pgsize_bitmap); |
7d3002cc OBC |
1398 | |
1399 | /* | |
1400 | * The virtual address, as well as the size of the mapping, must be | |
1401 | * aligned (at least) to the size of the smallest page supported | |
1402 | * by the hardware | |
1403 | */ | |
1404 | if (!IS_ALIGNED(iova | size, min_pagesz)) { | |
6197ca82 JP |
1405 | pr_err("unaligned: iova 0x%lx size 0x%zx min_pagesz 0x%x\n", |
1406 | iova, size, min_pagesz); | |
7d3002cc OBC |
1407 | return -EINVAL; |
1408 | } | |
1409 | ||
6197ca82 | 1410 | pr_debug("unmap this: iova 0x%lx size 0x%zx\n", iova, size); |
7d3002cc OBC |
1411 | |
1412 | /* | |
1413 | * Keep iterating until we either unmap 'size' bytes (or more) | |
1414 | * or we hit an area that isn't mapped. | |
1415 | */ | |
1416 | while (unmapped < size) { | |
bd13969b | 1417 | size_t pgsize = iommu_pgsize(domain, iova, size - unmapped); |
7d3002cc | 1418 | |
bd13969b | 1419 | unmapped_page = domain->ops->unmap(domain, iova, pgsize); |
7d3002cc OBC |
1420 | if (!unmapped_page) |
1421 | break; | |
1422 | ||
6197ca82 JP |
1423 | pr_debug("unmapped: iova 0x%lx size 0x%zx\n", |
1424 | iova, unmapped_page); | |
7d3002cc OBC |
1425 | |
1426 | iova += unmapped_page; | |
1427 | unmapped += unmapped_page; | |
1428 | } | |
1429 | ||
db8614d3 | 1430 | trace_unmap(orig_iova, size, unmapped); |
7d3002cc | 1431 | return unmapped; |
cefc53c7 JR |
1432 | } |
1433 | EXPORT_SYMBOL_GPL(iommu_unmap); | |
1460432c | 1434 | |
315786eb OH |
1435 | size_t default_iommu_map_sg(struct iommu_domain *domain, unsigned long iova, |
1436 | struct scatterlist *sg, unsigned int nents, int prot) | |
1437 | { | |
38ec010d | 1438 | struct scatterlist *s; |
315786eb | 1439 | size_t mapped = 0; |
18f23409 | 1440 | unsigned int i, min_pagesz; |
38ec010d | 1441 | int ret; |
315786eb | 1442 | |
d16e0faa | 1443 | if (unlikely(domain->pgsize_bitmap == 0UL)) |
18f23409 | 1444 | return 0; |
315786eb | 1445 | |
d16e0faa | 1446 | min_pagesz = 1 << __ffs(domain->pgsize_bitmap); |
18f23409 RM |
1447 | |
1448 | for_each_sg(sg, s, nents, i) { | |
3e6110fd | 1449 | phys_addr_t phys = page_to_phys(sg_page(s)) + s->offset; |
18f23409 RM |
1450 | |
1451 | /* | |
1452 | * We are mapping on IOMMU page boundaries, so offset within | |
1453 | * the page must be 0. However, the IOMMU may support pages | |
1454 | * smaller than PAGE_SIZE, so s->offset may still represent | |
1455 | * an offset of that boundary within the CPU page. | |
1456 | */ | |
1457 | if (!IS_ALIGNED(s->offset, min_pagesz)) | |
38ec010d JR |
1458 | goto out_err; |
1459 | ||
1460 | ret = iommu_map(domain, iova + mapped, phys, s->length, prot); | |
1461 | if (ret) | |
1462 | goto out_err; | |
1463 | ||
1464 | mapped += s->length; | |
315786eb OH |
1465 | } |
1466 | ||
1467 | return mapped; | |
38ec010d JR |
1468 | |
1469 | out_err: | |
1470 | /* undo mappings already done */ | |
1471 | iommu_unmap(domain, iova, mapped); | |
1472 | ||
1473 | return 0; | |
1474 | ||
315786eb OH |
1475 | } |
1476 | EXPORT_SYMBOL_GPL(default_iommu_map_sg); | |
d7787d57 JR |
1477 | |
1478 | int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr, | |
80f97f0f | 1479 | phys_addr_t paddr, u64 size, int prot) |
d7787d57 JR |
1480 | { |
1481 | if (unlikely(domain->ops->domain_window_enable == NULL)) | |
1482 | return -ENODEV; | |
1483 | ||
80f97f0f VS |
1484 | return domain->ops->domain_window_enable(domain, wnd_nr, paddr, size, |
1485 | prot); | |
d7787d57 JR |
1486 | } |
1487 | EXPORT_SYMBOL_GPL(iommu_domain_window_enable); | |
1488 | ||
1489 | void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr) | |
1490 | { | |
1491 | if (unlikely(domain->ops->domain_window_disable == NULL)) | |
1492 | return; | |
1493 | ||
1494 | return domain->ops->domain_window_disable(domain, wnd_nr); | |
1495 | } | |
1496 | EXPORT_SYMBOL_GPL(iommu_domain_window_disable); | |
1497 | ||
d72e31c9 | 1498 | static int __init iommu_init(void) |
1460432c | 1499 | { |
d72e31c9 AW |
1500 | iommu_group_kset = kset_create_and_add("iommu_groups", |
1501 | NULL, kernel_kobj); | |
d72e31c9 AW |
1502 | BUG_ON(!iommu_group_kset); |
1503 | ||
1504 | return 0; | |
1460432c | 1505 | } |
d7ef9995 | 1506 | core_initcall(iommu_init); |
0cd76dd1 JR |
1507 | |
1508 | int iommu_domain_get_attr(struct iommu_domain *domain, | |
1509 | enum iommu_attr attr, void *data) | |
1510 | { | |
0ff64f80 | 1511 | struct iommu_domain_geometry *geometry; |
d2e12160 | 1512 | bool *paging; |
0ff64f80 | 1513 | int ret = 0; |
69356712 | 1514 | u32 *count; |
0ff64f80 JR |
1515 | |
1516 | switch (attr) { | |
1517 | case DOMAIN_ATTR_GEOMETRY: | |
1518 | geometry = data; | |
1519 | *geometry = domain->geometry; | |
1520 | ||
d2e12160 JR |
1521 | break; |
1522 | case DOMAIN_ATTR_PAGING: | |
1523 | paging = data; | |
d16e0faa | 1524 | *paging = (domain->pgsize_bitmap != 0UL); |
69356712 JR |
1525 | break; |
1526 | case DOMAIN_ATTR_WINDOWS: | |
1527 | count = data; | |
1528 | ||
1529 | if (domain->ops->domain_get_windows != NULL) | |
1530 | *count = domain->ops->domain_get_windows(domain); | |
1531 | else | |
1532 | ret = -ENODEV; | |
1533 | ||
0ff64f80 JR |
1534 | break; |
1535 | default: | |
1536 | if (!domain->ops->domain_get_attr) | |
1537 | return -EINVAL; | |
0cd76dd1 | 1538 | |
0ff64f80 JR |
1539 | ret = domain->ops->domain_get_attr(domain, attr, data); |
1540 | } | |
1541 | ||
1542 | return ret; | |
0cd76dd1 JR |
1543 | } |
1544 | EXPORT_SYMBOL_GPL(iommu_domain_get_attr); | |
1545 | ||
1546 | int iommu_domain_set_attr(struct iommu_domain *domain, | |
1547 | enum iommu_attr attr, void *data) | |
1548 | { | |
69356712 JR |
1549 | int ret = 0; |
1550 | u32 *count; | |
1551 | ||
1552 | switch (attr) { | |
1553 | case DOMAIN_ATTR_WINDOWS: | |
1554 | count = data; | |
1555 | ||
1556 | if (domain->ops->domain_set_windows != NULL) | |
1557 | ret = domain->ops->domain_set_windows(domain, *count); | |
1558 | else | |
1559 | ret = -ENODEV; | |
1460432c | 1560 | |
69356712 JR |
1561 | break; |
1562 | default: | |
1563 | if (domain->ops->domain_set_attr == NULL) | |
1564 | return -EINVAL; | |
1565 | ||
1566 | ret = domain->ops->domain_set_attr(domain, attr, data); | |
1567 | } | |
1568 | ||
1569 | return ret; | |
1460432c | 1570 | } |
0cd76dd1 | 1571 | EXPORT_SYMBOL_GPL(iommu_domain_set_attr); |
a1015c2b JR |
1572 | |
1573 | void iommu_get_dm_regions(struct device *dev, struct list_head *list) | |
1574 | { | |
1575 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
1576 | ||
1577 | if (ops && ops->get_dm_regions) | |
1578 | ops->get_dm_regions(dev, list); | |
1579 | } | |
1580 | ||
1581 | void iommu_put_dm_regions(struct device *dev, struct list_head *list) | |
1582 | { | |
1583 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
1584 | ||
1585 | if (ops && ops->put_dm_regions) | |
1586 | ops->put_dm_regions(dev, list); | |
1587 | } | |
d290f1e7 JR |
1588 | |
1589 | /* Request that a device is direct mapped by the IOMMU */ | |
1590 | int iommu_request_dm_for_dev(struct device *dev) | |
1591 | { | |
1592 | struct iommu_domain *dm_domain; | |
1593 | struct iommu_group *group; | |
1594 | int ret; | |
1595 | ||
1596 | /* Device must already be in a group before calling this function */ | |
1597 | group = iommu_group_get_for_dev(dev); | |
409e553d DC |
1598 | if (IS_ERR(group)) |
1599 | return PTR_ERR(group); | |
d290f1e7 JR |
1600 | |
1601 | mutex_lock(&group->mutex); | |
1602 | ||
1603 | /* Check if the default domain is already direct mapped */ | |
1604 | ret = 0; | |
1605 | if (group->default_domain && | |
1606 | group->default_domain->type == IOMMU_DOMAIN_IDENTITY) | |
1607 | goto out; | |
1608 | ||
1609 | /* Don't change mappings of existing devices */ | |
1610 | ret = -EBUSY; | |
1611 | if (iommu_group_device_count(group) != 1) | |
1612 | goto out; | |
1613 | ||
1614 | /* Allocate a direct mapped domain */ | |
1615 | ret = -ENOMEM; | |
1616 | dm_domain = __iommu_domain_alloc(dev->bus, IOMMU_DOMAIN_IDENTITY); | |
1617 | if (!dm_domain) | |
1618 | goto out; | |
1619 | ||
1620 | /* Attach the device to the domain */ | |
1621 | ret = __iommu_attach_group(dm_domain, group); | |
1622 | if (ret) { | |
1623 | iommu_domain_free(dm_domain); | |
1624 | goto out; | |
1625 | } | |
1626 | ||
1627 | /* Make the direct mapped domain the default for this group */ | |
1628 | if (group->default_domain) | |
1629 | iommu_domain_free(group->default_domain); | |
1630 | group->default_domain = dm_domain; | |
1631 | ||
1632 | pr_info("Using direct mapping for device %s\n", dev_name(dev)); | |
1633 | ||
1634 | ret = 0; | |
1635 | out: | |
1636 | mutex_unlock(&group->mutex); | |
1637 | iommu_group_put(group); | |
1638 | ||
1639 | return ret; | |
1640 | } | |
57f98d2f | 1641 | |
e4f10ffe LP |
1642 | struct iommu_instance { |
1643 | struct list_head list; | |
1644 | struct fwnode_handle *fwnode; | |
1645 | const struct iommu_ops *ops; | |
1646 | }; | |
1647 | static LIST_HEAD(iommu_instance_list); | |
1648 | static DEFINE_SPINLOCK(iommu_instance_lock); | |
1649 | ||
1650 | void iommu_register_instance(struct fwnode_handle *fwnode, | |
1651 | const struct iommu_ops *ops) | |
1652 | { | |
1653 | struct iommu_instance *iommu = kzalloc(sizeof(*iommu), GFP_KERNEL); | |
1654 | ||
1655 | if (WARN_ON(!iommu)) | |
1656 | return; | |
1657 | ||
1658 | of_node_get(to_of_node(fwnode)); | |
1659 | INIT_LIST_HEAD(&iommu->list); | |
1660 | iommu->fwnode = fwnode; | |
1661 | iommu->ops = ops; | |
1662 | spin_lock(&iommu_instance_lock); | |
1663 | list_add_tail(&iommu->list, &iommu_instance_list); | |
1664 | spin_unlock(&iommu_instance_lock); | |
1665 | } | |
1666 | ||
534766df | 1667 | const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode) |
e4f10ffe LP |
1668 | { |
1669 | struct iommu_instance *instance; | |
1670 | const struct iommu_ops *ops = NULL; | |
1671 | ||
1672 | spin_lock(&iommu_instance_lock); | |
1673 | list_for_each_entry(instance, &iommu_instance_list, list) | |
1674 | if (instance->fwnode == fwnode) { | |
1675 | ops = instance->ops; | |
1676 | break; | |
1677 | } | |
1678 | spin_unlock(&iommu_instance_lock); | |
1679 | return ops; | |
1680 | } | |
1681 | ||
57f98d2f RM |
1682 | int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode, |
1683 | const struct iommu_ops *ops) | |
1684 | { | |
1685 | struct iommu_fwspec *fwspec = dev->iommu_fwspec; | |
1686 | ||
1687 | if (fwspec) | |
1688 | return ops == fwspec->ops ? 0 : -EINVAL; | |
1689 | ||
1690 | fwspec = kzalloc(sizeof(*fwspec), GFP_KERNEL); | |
1691 | if (!fwspec) | |
1692 | return -ENOMEM; | |
1693 | ||
1694 | of_node_get(to_of_node(iommu_fwnode)); | |
1695 | fwspec->iommu_fwnode = iommu_fwnode; | |
1696 | fwspec->ops = ops; | |
1697 | dev->iommu_fwspec = fwspec; | |
1698 | return 0; | |
1699 | } | |
1700 | EXPORT_SYMBOL_GPL(iommu_fwspec_init); | |
1701 | ||
1702 | void iommu_fwspec_free(struct device *dev) | |
1703 | { | |
1704 | struct iommu_fwspec *fwspec = dev->iommu_fwspec; | |
1705 | ||
1706 | if (fwspec) { | |
1707 | fwnode_handle_put(fwspec->iommu_fwnode); | |
1708 | kfree(fwspec); | |
1709 | dev->iommu_fwspec = NULL; | |
1710 | } | |
1711 | } | |
1712 | EXPORT_SYMBOL_GPL(iommu_fwspec_free); | |
1713 | ||
1714 | int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids) | |
1715 | { | |
1716 | struct iommu_fwspec *fwspec = dev->iommu_fwspec; | |
1717 | size_t size; | |
1718 | int i; | |
1719 | ||
1720 | if (!fwspec) | |
1721 | return -EINVAL; | |
1722 | ||
1723 | size = offsetof(struct iommu_fwspec, ids[fwspec->num_ids + num_ids]); | |
1724 | if (size > sizeof(*fwspec)) { | |
1725 | fwspec = krealloc(dev->iommu_fwspec, size, GFP_KERNEL); | |
1726 | if (!fwspec) | |
1727 | return -ENOMEM; | |
1728 | } | |
1729 | ||
1730 | for (i = 0; i < num_ids; i++) | |
1731 | fwspec->ids[fwspec->num_ids + i] = ids[i]; | |
1732 | ||
1733 | fwspec->num_ids += num_ids; | |
1734 | dev->iommu_fwspec = fwspec; | |
1735 | return 0; | |
1736 | } | |
1737 | EXPORT_SYMBOL_GPL(iommu_fwspec_add_ids); |