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fc2100eb JR |
1 | /* |
2 | * Copyright (C) 2007-2008 Advanced Micro Devices, Inc. | |
3 | * Author: Joerg Roedel <joerg.roedel@amd.com> | |
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 | ||
7d3002cc OBC |
19 | #define pr_fmt(fmt) "%s: " fmt, __func__ |
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> |
7f6db171 | 33 | #include <trace/events/iommu.h> |
d72e31c9 AW |
34 | |
35 | static struct kset *iommu_group_kset; | |
36 | static struct ida iommu_group_ida; | |
37 | static struct mutex iommu_group_mutex; | |
38 | ||
b22f6434 TR |
39 | struct iommu_callback_data { |
40 | const struct iommu_ops *ops; | |
41 | }; | |
42 | ||
d72e31c9 AW |
43 | struct iommu_group { |
44 | struct kobject kobj; | |
45 | struct kobject *devices_kobj; | |
46 | struct list_head devices; | |
47 | struct mutex mutex; | |
48 | struct blocking_notifier_head notifier; | |
49 | void *iommu_data; | |
50 | void (*iommu_data_release)(void *iommu_data); | |
51 | char *name; | |
52 | int id; | |
53 | }; | |
54 | ||
55 | struct iommu_device { | |
56 | struct list_head list; | |
57 | struct device *dev; | |
58 | char *name; | |
59 | }; | |
60 | ||
61 | struct iommu_group_attribute { | |
62 | struct attribute attr; | |
63 | ssize_t (*show)(struct iommu_group *group, char *buf); | |
64 | ssize_t (*store)(struct iommu_group *group, | |
65 | const char *buf, size_t count); | |
66 | }; | |
67 | ||
68 | #define IOMMU_GROUP_ATTR(_name, _mode, _show, _store) \ | |
69 | struct iommu_group_attribute iommu_group_attr_##_name = \ | |
70 | __ATTR(_name, _mode, _show, _store) | |
fc2100eb | 71 | |
d72e31c9 AW |
72 | #define to_iommu_group_attr(_attr) \ |
73 | container_of(_attr, struct iommu_group_attribute, attr) | |
74 | #define to_iommu_group(_kobj) \ | |
75 | container_of(_kobj, struct iommu_group, kobj) | |
fc2100eb | 76 | |
d72e31c9 AW |
77 | static ssize_t iommu_group_attr_show(struct kobject *kobj, |
78 | struct attribute *__attr, char *buf) | |
1460432c | 79 | { |
d72e31c9 AW |
80 | struct iommu_group_attribute *attr = to_iommu_group_attr(__attr); |
81 | struct iommu_group *group = to_iommu_group(kobj); | |
82 | ssize_t ret = -EIO; | |
1460432c | 83 | |
d72e31c9 AW |
84 | if (attr->show) |
85 | ret = attr->show(group, buf); | |
86 | return ret; | |
87 | } | |
88 | ||
89 | static ssize_t iommu_group_attr_store(struct kobject *kobj, | |
90 | struct attribute *__attr, | |
91 | const char *buf, size_t count) | |
92 | { | |
93 | struct iommu_group_attribute *attr = to_iommu_group_attr(__attr); | |
94 | struct iommu_group *group = to_iommu_group(kobj); | |
95 | ssize_t ret = -EIO; | |
1460432c | 96 | |
d72e31c9 AW |
97 | if (attr->store) |
98 | ret = attr->store(group, buf, count); | |
99 | return ret; | |
1460432c | 100 | } |
1460432c | 101 | |
d72e31c9 AW |
102 | static const struct sysfs_ops iommu_group_sysfs_ops = { |
103 | .show = iommu_group_attr_show, | |
104 | .store = iommu_group_attr_store, | |
105 | }; | |
1460432c | 106 | |
d72e31c9 AW |
107 | static int iommu_group_create_file(struct iommu_group *group, |
108 | struct iommu_group_attribute *attr) | |
109 | { | |
110 | return sysfs_create_file(&group->kobj, &attr->attr); | |
1460432c | 111 | } |
1460432c | 112 | |
d72e31c9 AW |
113 | static void iommu_group_remove_file(struct iommu_group *group, |
114 | struct iommu_group_attribute *attr) | |
115 | { | |
116 | sysfs_remove_file(&group->kobj, &attr->attr); | |
117 | } | |
118 | ||
119 | static ssize_t iommu_group_show_name(struct iommu_group *group, char *buf) | |
120 | { | |
121 | return sprintf(buf, "%s\n", group->name); | |
122 | } | |
123 | ||
124 | static IOMMU_GROUP_ATTR(name, S_IRUGO, iommu_group_show_name, NULL); | |
125 | ||
126 | static void iommu_group_release(struct kobject *kobj) | |
127 | { | |
128 | struct iommu_group *group = to_iommu_group(kobj); | |
129 | ||
130 | if (group->iommu_data_release) | |
131 | group->iommu_data_release(group->iommu_data); | |
132 | ||
133 | mutex_lock(&iommu_group_mutex); | |
134 | ida_remove(&iommu_group_ida, group->id); | |
135 | mutex_unlock(&iommu_group_mutex); | |
136 | ||
137 | kfree(group->name); | |
138 | kfree(group); | |
139 | } | |
140 | ||
141 | static struct kobj_type iommu_group_ktype = { | |
142 | .sysfs_ops = &iommu_group_sysfs_ops, | |
143 | .release = iommu_group_release, | |
144 | }; | |
145 | ||
146 | /** | |
147 | * iommu_group_alloc - Allocate a new group | |
148 | * @name: Optional name to associate with group, visible in sysfs | |
149 | * | |
150 | * This function is called by an iommu driver to allocate a new iommu | |
151 | * group. The iommu group represents the minimum granularity of the iommu. | |
152 | * Upon successful return, the caller holds a reference to the supplied | |
153 | * group in order to hold the group until devices are added. Use | |
154 | * iommu_group_put() to release this extra reference count, allowing the | |
155 | * group to be automatically reclaimed once it has no devices or external | |
156 | * references. | |
157 | */ | |
158 | struct iommu_group *iommu_group_alloc(void) | |
1460432c | 159 | { |
d72e31c9 AW |
160 | struct iommu_group *group; |
161 | int ret; | |
162 | ||
163 | group = kzalloc(sizeof(*group), GFP_KERNEL); | |
164 | if (!group) | |
165 | return ERR_PTR(-ENOMEM); | |
166 | ||
167 | group->kobj.kset = iommu_group_kset; | |
168 | mutex_init(&group->mutex); | |
169 | INIT_LIST_HEAD(&group->devices); | |
170 | BLOCKING_INIT_NOTIFIER_HEAD(&group->notifier); | |
171 | ||
172 | mutex_lock(&iommu_group_mutex); | |
173 | ||
174 | again: | |
175 | if (unlikely(0 == ida_pre_get(&iommu_group_ida, GFP_KERNEL))) { | |
176 | kfree(group); | |
177 | mutex_unlock(&iommu_group_mutex); | |
178 | return ERR_PTR(-ENOMEM); | |
179 | } | |
180 | ||
181 | if (-EAGAIN == ida_get_new(&iommu_group_ida, &group->id)) | |
182 | goto again; | |
183 | ||
184 | mutex_unlock(&iommu_group_mutex); | |
1460432c | 185 | |
d72e31c9 AW |
186 | ret = kobject_init_and_add(&group->kobj, &iommu_group_ktype, |
187 | NULL, "%d", group->id); | |
188 | if (ret) { | |
189 | mutex_lock(&iommu_group_mutex); | |
190 | ida_remove(&iommu_group_ida, group->id); | |
191 | mutex_unlock(&iommu_group_mutex); | |
192 | kfree(group); | |
193 | return ERR_PTR(ret); | |
194 | } | |
195 | ||
196 | group->devices_kobj = kobject_create_and_add("devices", &group->kobj); | |
197 | if (!group->devices_kobj) { | |
198 | kobject_put(&group->kobj); /* triggers .release & free */ | |
199 | return ERR_PTR(-ENOMEM); | |
200 | } | |
201 | ||
202 | /* | |
203 | * The devices_kobj holds a reference on the group kobject, so | |
204 | * as long as that exists so will the group. We can therefore | |
205 | * use the devices_kobj for reference counting. | |
206 | */ | |
207 | kobject_put(&group->kobj); | |
208 | ||
209 | return group; | |
210 | } | |
211 | EXPORT_SYMBOL_GPL(iommu_group_alloc); | |
212 | ||
aa16bea9 AK |
213 | struct iommu_group *iommu_group_get_by_id(int id) |
214 | { | |
215 | struct kobject *group_kobj; | |
216 | struct iommu_group *group; | |
217 | const char *name; | |
218 | ||
219 | if (!iommu_group_kset) | |
220 | return NULL; | |
221 | ||
222 | name = kasprintf(GFP_KERNEL, "%d", id); | |
223 | if (!name) | |
224 | return NULL; | |
225 | ||
226 | group_kobj = kset_find_obj(iommu_group_kset, name); | |
227 | kfree(name); | |
228 | ||
229 | if (!group_kobj) | |
230 | return NULL; | |
231 | ||
232 | group = container_of(group_kobj, struct iommu_group, kobj); | |
233 | BUG_ON(group->id != id); | |
234 | ||
235 | kobject_get(group->devices_kobj); | |
236 | kobject_put(&group->kobj); | |
237 | ||
238 | return group; | |
239 | } | |
240 | EXPORT_SYMBOL_GPL(iommu_group_get_by_id); | |
241 | ||
d72e31c9 AW |
242 | /** |
243 | * iommu_group_get_iommudata - retrieve iommu_data registered for a group | |
244 | * @group: the group | |
245 | * | |
246 | * iommu drivers can store data in the group for use when doing iommu | |
247 | * operations. This function provides a way to retrieve it. Caller | |
248 | * should hold a group reference. | |
249 | */ | |
250 | void *iommu_group_get_iommudata(struct iommu_group *group) | |
251 | { | |
252 | return group->iommu_data; | |
253 | } | |
254 | EXPORT_SYMBOL_GPL(iommu_group_get_iommudata); | |
255 | ||
256 | /** | |
257 | * iommu_group_set_iommudata - set iommu_data for a group | |
258 | * @group: the group | |
259 | * @iommu_data: new data | |
260 | * @release: release function for iommu_data | |
261 | * | |
262 | * iommu drivers can store data in the group for use when doing iommu | |
263 | * operations. This function provides a way to set the data after | |
264 | * the group has been allocated. Caller should hold a group reference. | |
265 | */ | |
266 | void iommu_group_set_iommudata(struct iommu_group *group, void *iommu_data, | |
267 | void (*release)(void *iommu_data)) | |
1460432c | 268 | { |
d72e31c9 AW |
269 | group->iommu_data = iommu_data; |
270 | group->iommu_data_release = release; | |
271 | } | |
272 | EXPORT_SYMBOL_GPL(iommu_group_set_iommudata); | |
1460432c | 273 | |
d72e31c9 AW |
274 | /** |
275 | * iommu_group_set_name - set name for a group | |
276 | * @group: the group | |
277 | * @name: name | |
278 | * | |
279 | * Allow iommu driver to set a name for a group. When set it will | |
280 | * appear in a name attribute file under the group in sysfs. | |
281 | */ | |
282 | int iommu_group_set_name(struct iommu_group *group, const char *name) | |
283 | { | |
284 | int ret; | |
285 | ||
286 | if (group->name) { | |
287 | iommu_group_remove_file(group, &iommu_group_attr_name); | |
288 | kfree(group->name); | |
289 | group->name = NULL; | |
290 | if (!name) | |
291 | return 0; | |
292 | } | |
293 | ||
294 | group->name = kstrdup(name, GFP_KERNEL); | |
295 | if (!group->name) | |
296 | return -ENOMEM; | |
297 | ||
298 | ret = iommu_group_create_file(group, &iommu_group_attr_name); | |
299 | if (ret) { | |
300 | kfree(group->name); | |
301 | group->name = NULL; | |
302 | return ret; | |
303 | } | |
1460432c AW |
304 | |
305 | return 0; | |
306 | } | |
d72e31c9 | 307 | EXPORT_SYMBOL_GPL(iommu_group_set_name); |
1460432c | 308 | |
d72e31c9 AW |
309 | /** |
310 | * iommu_group_add_device - add a device to an iommu group | |
311 | * @group: the group into which to add the device (reference should be held) | |
312 | * @dev: the device | |
313 | * | |
314 | * This function is called by an iommu driver to add a device into a | |
315 | * group. Adding a device increments the group reference count. | |
316 | */ | |
317 | int iommu_group_add_device(struct iommu_group *group, struct device *dev) | |
1460432c | 318 | { |
d72e31c9 AW |
319 | int ret, i = 0; |
320 | struct iommu_device *device; | |
321 | ||
322 | device = kzalloc(sizeof(*device), GFP_KERNEL); | |
323 | if (!device) | |
324 | return -ENOMEM; | |
325 | ||
326 | device->dev = dev; | |
1460432c | 327 | |
d72e31c9 AW |
328 | ret = sysfs_create_link(&dev->kobj, &group->kobj, "iommu_group"); |
329 | if (ret) { | |
330 | kfree(device); | |
331 | return ret; | |
332 | } | |
333 | ||
334 | device->name = kasprintf(GFP_KERNEL, "%s", kobject_name(&dev->kobj)); | |
335 | rename: | |
336 | if (!device->name) { | |
337 | sysfs_remove_link(&dev->kobj, "iommu_group"); | |
338 | kfree(device); | |
339 | return -ENOMEM; | |
340 | } | |
1460432c | 341 | |
d72e31c9 AW |
342 | ret = sysfs_create_link_nowarn(group->devices_kobj, |
343 | &dev->kobj, device->name); | |
344 | if (ret) { | |
345 | kfree(device->name); | |
346 | if (ret == -EEXIST && i >= 0) { | |
347 | /* | |
348 | * Account for the slim chance of collision | |
349 | * and append an instance to the name. | |
350 | */ | |
351 | device->name = kasprintf(GFP_KERNEL, "%s.%d", | |
352 | kobject_name(&dev->kobj), i++); | |
353 | goto rename; | |
354 | } | |
355 | ||
356 | sysfs_remove_link(&dev->kobj, "iommu_group"); | |
357 | kfree(device); | |
358 | return ret; | |
359 | } | |
360 | ||
361 | kobject_get(group->devices_kobj); | |
362 | ||
363 | dev->iommu_group = group; | |
364 | ||
365 | mutex_lock(&group->mutex); | |
366 | list_add_tail(&device->list, &group->devices); | |
367 | mutex_unlock(&group->mutex); | |
368 | ||
369 | /* Notify any listeners about change to group. */ | |
370 | blocking_notifier_call_chain(&group->notifier, | |
371 | IOMMU_GROUP_NOTIFY_ADD_DEVICE, dev); | |
d1cf7e82 SK |
372 | |
373 | trace_add_device_to_group(group->id, dev); | |
1460432c AW |
374 | return 0; |
375 | } | |
d72e31c9 | 376 | EXPORT_SYMBOL_GPL(iommu_group_add_device); |
1460432c | 377 | |
d72e31c9 AW |
378 | /** |
379 | * iommu_group_remove_device - remove a device from it's current group | |
380 | * @dev: device to be removed | |
381 | * | |
382 | * This function is called by an iommu driver to remove the device from | |
383 | * it's current group. This decrements the iommu group reference count. | |
384 | */ | |
385 | void iommu_group_remove_device(struct device *dev) | |
386 | { | |
387 | struct iommu_group *group = dev->iommu_group; | |
388 | struct iommu_device *tmp_device, *device = NULL; | |
389 | ||
390 | /* Pre-notify listeners that a device is being removed. */ | |
391 | blocking_notifier_call_chain(&group->notifier, | |
392 | IOMMU_GROUP_NOTIFY_DEL_DEVICE, dev); | |
393 | ||
394 | mutex_lock(&group->mutex); | |
395 | list_for_each_entry(tmp_device, &group->devices, list) { | |
396 | if (tmp_device->dev == dev) { | |
397 | device = tmp_device; | |
398 | list_del(&device->list); | |
399 | break; | |
400 | } | |
401 | } | |
402 | mutex_unlock(&group->mutex); | |
403 | ||
404 | if (!device) | |
405 | return; | |
406 | ||
407 | sysfs_remove_link(group->devices_kobj, device->name); | |
408 | sysfs_remove_link(&dev->kobj, "iommu_group"); | |
409 | ||
2e757086 SK |
410 | trace_remove_device_from_group(group->id, dev); |
411 | ||
d72e31c9 AW |
412 | kfree(device->name); |
413 | kfree(device); | |
414 | dev->iommu_group = NULL; | |
415 | kobject_put(group->devices_kobj); | |
416 | } | |
417 | EXPORT_SYMBOL_GPL(iommu_group_remove_device); | |
418 | ||
419 | /** | |
420 | * iommu_group_for_each_dev - iterate over each device in the group | |
421 | * @group: the group | |
422 | * @data: caller opaque data to be passed to callback function | |
423 | * @fn: caller supplied callback function | |
424 | * | |
425 | * This function is called by group users to iterate over group devices. | |
426 | * Callers should hold a reference count to the group during callback. | |
427 | * The group->mutex is held across callbacks, which will block calls to | |
428 | * iommu_group_add/remove_device. | |
429 | */ | |
430 | int iommu_group_for_each_dev(struct iommu_group *group, void *data, | |
431 | int (*fn)(struct device *, void *)) | |
432 | { | |
433 | struct iommu_device *device; | |
434 | int ret = 0; | |
435 | ||
436 | mutex_lock(&group->mutex); | |
437 | list_for_each_entry(device, &group->devices, list) { | |
438 | ret = fn(device->dev, data); | |
439 | if (ret) | |
440 | break; | |
441 | } | |
442 | mutex_unlock(&group->mutex); | |
443 | return ret; | |
444 | } | |
445 | EXPORT_SYMBOL_GPL(iommu_group_for_each_dev); | |
446 | ||
447 | /** | |
448 | * iommu_group_get - Return the group for a device and increment reference | |
449 | * @dev: get the group that this device belongs to | |
450 | * | |
451 | * This function is called by iommu drivers and users to get the group | |
452 | * for the specified device. If found, the group is returned and the group | |
453 | * reference in incremented, else NULL. | |
454 | */ | |
455 | struct iommu_group *iommu_group_get(struct device *dev) | |
456 | { | |
457 | struct iommu_group *group = dev->iommu_group; | |
458 | ||
459 | if (group) | |
460 | kobject_get(group->devices_kobj); | |
461 | ||
462 | return group; | |
463 | } | |
464 | EXPORT_SYMBOL_GPL(iommu_group_get); | |
465 | ||
466 | /** | |
467 | * iommu_group_put - Decrement group reference | |
468 | * @group: the group to use | |
469 | * | |
470 | * This function is called by iommu drivers and users to release the | |
471 | * iommu group. Once the reference count is zero, the group is released. | |
472 | */ | |
473 | void iommu_group_put(struct iommu_group *group) | |
474 | { | |
475 | if (group) | |
476 | kobject_put(group->devices_kobj); | |
477 | } | |
478 | EXPORT_SYMBOL_GPL(iommu_group_put); | |
479 | ||
480 | /** | |
481 | * iommu_group_register_notifier - Register a notifier for group changes | |
482 | * @group: the group to watch | |
483 | * @nb: notifier block to signal | |
484 | * | |
485 | * This function allows iommu group users to track changes in a group. | |
486 | * See include/linux/iommu.h for actions sent via this notifier. Caller | |
487 | * should hold a reference to the group throughout notifier registration. | |
488 | */ | |
489 | int iommu_group_register_notifier(struct iommu_group *group, | |
490 | struct notifier_block *nb) | |
491 | { | |
492 | return blocking_notifier_chain_register(&group->notifier, nb); | |
493 | } | |
494 | EXPORT_SYMBOL_GPL(iommu_group_register_notifier); | |
495 | ||
496 | /** | |
497 | * iommu_group_unregister_notifier - Unregister a notifier | |
498 | * @group: the group to watch | |
499 | * @nb: notifier block to signal | |
500 | * | |
501 | * Unregister a previously registered group notifier block. | |
502 | */ | |
503 | int iommu_group_unregister_notifier(struct iommu_group *group, | |
504 | struct notifier_block *nb) | |
505 | { | |
506 | return blocking_notifier_chain_unregister(&group->notifier, nb); | |
507 | } | |
508 | EXPORT_SYMBOL_GPL(iommu_group_unregister_notifier); | |
509 | ||
510 | /** | |
511 | * iommu_group_id - Return ID for a group | |
512 | * @group: the group to ID | |
513 | * | |
514 | * Return the unique ID for the group matching the sysfs group number. | |
515 | */ | |
516 | int iommu_group_id(struct iommu_group *group) | |
517 | { | |
518 | return group->id; | |
519 | } | |
520 | EXPORT_SYMBOL_GPL(iommu_group_id); | |
1460432c | 521 | |
104a1c13 AW |
522 | /* |
523 | * To consider a PCI device isolated, we require ACS to support Source | |
524 | * Validation, Request Redirection, Completer Redirection, and Upstream | |
525 | * Forwarding. This effectively means that devices cannot spoof their | |
526 | * requester ID, requests and completions cannot be redirected, and all | |
527 | * transactions are forwarded upstream, even as it passes through a | |
528 | * bridge where the target device is downstream. | |
529 | */ | |
530 | #define REQ_ACS_FLAGS (PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF) | |
531 | ||
532 | struct group_for_pci_data { | |
533 | struct pci_dev *pdev; | |
534 | struct iommu_group *group; | |
535 | }; | |
536 | ||
537 | /* | |
538 | * DMA alias iterator callback, return the last seen device. Stop and return | |
539 | * the IOMMU group if we find one along the way. | |
540 | */ | |
541 | static int get_pci_alias_or_group(struct pci_dev *pdev, u16 alias, void *opaque) | |
542 | { | |
543 | struct group_for_pci_data *data = opaque; | |
544 | ||
545 | data->pdev = pdev; | |
546 | data->group = iommu_group_get(&pdev->dev); | |
547 | ||
548 | return data->group != NULL; | |
549 | } | |
550 | ||
551 | /* | |
552 | * Use standard PCI bus topology, isolation features, and DMA alias quirks | |
553 | * to find or create an IOMMU group for a device. | |
554 | */ | |
555 | static struct iommu_group *iommu_group_get_for_pci_dev(struct pci_dev *pdev) | |
556 | { | |
557 | struct group_for_pci_data data; | |
558 | struct pci_bus *bus; | |
559 | struct iommu_group *group = NULL; | |
560 | struct pci_dev *tmp; | |
561 | ||
562 | /* | |
563 | * Find the upstream DMA alias for the device. A device must not | |
564 | * be aliased due to topology in order to have its own IOMMU group. | |
565 | * If we find an alias along the way that already belongs to a | |
566 | * group, use it. | |
567 | */ | |
568 | if (pci_for_each_dma_alias(pdev, get_pci_alias_or_group, &data)) | |
569 | return data.group; | |
570 | ||
571 | pdev = data.pdev; | |
572 | ||
573 | /* | |
574 | * Continue upstream from the point of minimum IOMMU granularity | |
575 | * due to aliases to the point where devices are protected from | |
576 | * peer-to-peer DMA by PCI ACS. Again, if we find an existing | |
577 | * group, use it. | |
578 | */ | |
579 | for (bus = pdev->bus; !pci_is_root_bus(bus); bus = bus->parent) { | |
580 | if (!bus->self) | |
581 | continue; | |
582 | ||
583 | if (pci_acs_path_enabled(bus->self, NULL, REQ_ACS_FLAGS)) | |
584 | break; | |
585 | ||
586 | pdev = bus->self; | |
587 | ||
588 | group = iommu_group_get(&pdev->dev); | |
589 | if (group) | |
590 | return group; | |
591 | } | |
592 | ||
593 | /* | |
594 | * Next we need to consider DMA alias quirks. If one device aliases | |
595 | * to another, they should be grouped together. It's theoretically | |
596 | * possible that aliases could create chains of devices where each | |
597 | * device aliases another device. If we then factor in multifunction | |
598 | * ACS grouping requirements, each alias could incorporate a new slot | |
599 | * with multiple functions, each with aliases. This is all extremely | |
600 | * unlikely as DMA alias quirks are typically only used for PCIe | |
601 | * devices where we usually have a single slot per bus. Furthermore, | |
602 | * the alias quirk is usually to another function within the slot | |
603 | * (and ACS multifunction is not supported) or to a different slot | |
604 | * that doesn't physically exist. The likely scenario is therefore | |
605 | * that everything on the bus gets grouped together. To reduce the | |
606 | * problem space, share the IOMMU group for all devices on the bus | |
607 | * if a DMA alias quirk is present on the bus. | |
608 | */ | |
609 | tmp = NULL; | |
610 | for_each_pci_dev(tmp) { | |
611 | if (tmp->bus != pdev->bus || | |
612 | !(tmp->dev_flags & PCI_DEV_FLAGS_DMA_ALIAS_DEVFN)) | |
613 | continue; | |
614 | ||
615 | pci_dev_put(tmp); | |
616 | tmp = NULL; | |
617 | ||
618 | /* We have an alias quirk, search for an existing group */ | |
619 | for_each_pci_dev(tmp) { | |
620 | struct iommu_group *group_tmp; | |
621 | ||
622 | if (tmp->bus != pdev->bus) | |
623 | continue; | |
624 | ||
625 | group_tmp = iommu_group_get(&tmp->dev); | |
626 | if (!group) { | |
627 | group = group_tmp; | |
628 | continue; | |
629 | } | |
630 | ||
631 | if (group_tmp) { | |
632 | WARN_ON(group != group_tmp); | |
633 | iommu_group_put(group_tmp); | |
634 | } | |
635 | } | |
636 | ||
637 | return group ? group : iommu_group_alloc(); | |
638 | } | |
639 | ||
640 | /* | |
641 | * Non-multifunction devices or multifunction devices supporting | |
642 | * ACS get their own group. | |
643 | */ | |
644 | if (!pdev->multifunction || pci_acs_enabled(pdev, REQ_ACS_FLAGS)) | |
645 | return iommu_group_alloc(); | |
646 | ||
647 | /* | |
648 | * Multifunction devices not supporting ACS share a group with other | |
649 | * similar devices in the same slot. | |
650 | */ | |
651 | tmp = NULL; | |
652 | for_each_pci_dev(tmp) { | |
653 | if (tmp == pdev || tmp->bus != pdev->bus || | |
654 | PCI_SLOT(tmp->devfn) != PCI_SLOT(pdev->devfn) || | |
655 | pci_acs_enabled(tmp, REQ_ACS_FLAGS)) | |
656 | continue; | |
657 | ||
658 | group = iommu_group_get(&tmp->dev); | |
659 | if (group) { | |
660 | pci_dev_put(tmp); | |
661 | return group; | |
662 | } | |
663 | } | |
664 | ||
665 | /* No shared group found, allocate new */ | |
666 | return iommu_group_alloc(); | |
667 | } | |
668 | ||
669 | /** | |
670 | * iommu_group_get_for_dev - Find or create the IOMMU group for a device | |
671 | * @dev: target device | |
672 | * | |
673 | * This function is intended to be called by IOMMU drivers and extended to | |
674 | * support common, bus-defined algorithms when determining or creating the | |
675 | * IOMMU group for a device. On success, the caller will hold a reference | |
676 | * to the returned IOMMU group, which will already include the provided | |
677 | * device. The reference should be released with iommu_group_put(). | |
678 | */ | |
679 | struct iommu_group *iommu_group_get_for_dev(struct device *dev) | |
680 | { | |
681 | struct iommu_group *group = ERR_PTR(-EIO); | |
682 | int ret; | |
683 | ||
684 | group = iommu_group_get(dev); | |
685 | if (group) | |
686 | return group; | |
687 | ||
688 | if (dev_is_pci(dev)) | |
689 | group = iommu_group_get_for_pci_dev(to_pci_dev(dev)); | |
690 | ||
691 | if (IS_ERR(group)) | |
692 | return group; | |
693 | ||
694 | ret = iommu_group_add_device(group, dev); | |
695 | if (ret) { | |
696 | iommu_group_put(group); | |
697 | return ERR_PTR(ret); | |
698 | } | |
699 | ||
700 | return group; | |
701 | } | |
702 | ||
d72e31c9 | 703 | static int add_iommu_group(struct device *dev, void *data) |
1460432c | 704 | { |
b22f6434 TR |
705 | struct iommu_callback_data *cb = data; |
706 | const struct iommu_ops *ops = cb->ops; | |
d72e31c9 AW |
707 | |
708 | if (!ops->add_device) | |
709 | return -ENODEV; | |
1460432c | 710 | |
d72e31c9 AW |
711 | WARN_ON(dev->iommu_group); |
712 | ||
713 | ops->add_device(dev); | |
1460432c AW |
714 | |
715 | return 0; | |
716 | } | |
717 | ||
d72e31c9 AW |
718 | static int iommu_bus_notifier(struct notifier_block *nb, |
719 | unsigned long action, void *data) | |
1460432c AW |
720 | { |
721 | struct device *dev = data; | |
b22f6434 | 722 | const struct iommu_ops *ops = dev->bus->iommu_ops; |
d72e31c9 AW |
723 | struct iommu_group *group; |
724 | unsigned long group_action = 0; | |
725 | ||
726 | /* | |
727 | * ADD/DEL call into iommu driver ops if provided, which may | |
728 | * result in ADD/DEL notifiers to group->notifier | |
729 | */ | |
730 | if (action == BUS_NOTIFY_ADD_DEVICE) { | |
731 | if (ops->add_device) | |
732 | return ops->add_device(dev); | |
733 | } else if (action == BUS_NOTIFY_DEL_DEVICE) { | |
734 | if (ops->remove_device && dev->iommu_group) { | |
735 | ops->remove_device(dev); | |
736 | return 0; | |
737 | } | |
738 | } | |
1460432c | 739 | |
d72e31c9 AW |
740 | /* |
741 | * Remaining BUS_NOTIFYs get filtered and republished to the | |
742 | * group, if anyone is listening | |
743 | */ | |
744 | group = iommu_group_get(dev); | |
745 | if (!group) | |
746 | return 0; | |
1460432c | 747 | |
d72e31c9 AW |
748 | switch (action) { |
749 | case BUS_NOTIFY_BIND_DRIVER: | |
750 | group_action = IOMMU_GROUP_NOTIFY_BIND_DRIVER; | |
751 | break; | |
752 | case BUS_NOTIFY_BOUND_DRIVER: | |
753 | group_action = IOMMU_GROUP_NOTIFY_BOUND_DRIVER; | |
754 | break; | |
755 | case BUS_NOTIFY_UNBIND_DRIVER: | |
756 | group_action = IOMMU_GROUP_NOTIFY_UNBIND_DRIVER; | |
757 | break; | |
758 | case BUS_NOTIFY_UNBOUND_DRIVER: | |
759 | group_action = IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER; | |
760 | break; | |
761 | } | |
1460432c | 762 | |
d72e31c9 AW |
763 | if (group_action) |
764 | blocking_notifier_call_chain(&group->notifier, | |
765 | group_action, dev); | |
1460432c | 766 | |
d72e31c9 | 767 | iommu_group_put(group); |
1460432c AW |
768 | return 0; |
769 | } | |
770 | ||
d72e31c9 AW |
771 | static struct notifier_block iommu_bus_nb = { |
772 | .notifier_call = iommu_bus_notifier, | |
1460432c AW |
773 | }; |
774 | ||
b22f6434 | 775 | static void iommu_bus_init(struct bus_type *bus, const struct iommu_ops *ops) |
ff21776d | 776 | { |
b22f6434 TR |
777 | struct iommu_callback_data cb = { |
778 | .ops = ops, | |
779 | }; | |
780 | ||
d72e31c9 | 781 | bus_register_notifier(bus, &iommu_bus_nb); |
b22f6434 | 782 | bus_for_each_dev(bus, NULL, &cb, add_iommu_group); |
ff21776d | 783 | } |
fc2100eb | 784 | |
ff21776d JR |
785 | /** |
786 | * bus_set_iommu - set iommu-callbacks for the bus | |
787 | * @bus: bus. | |
788 | * @ops: the callbacks provided by the iommu-driver | |
789 | * | |
790 | * This function is called by an iommu driver to set the iommu methods | |
791 | * used for a particular bus. Drivers for devices on that bus can use | |
792 | * the iommu-api after these ops are registered. | |
793 | * This special function is needed because IOMMUs are usually devices on | |
794 | * the bus itself, so the iommu drivers are not initialized when the bus | |
795 | * is set up. With this function the iommu-driver can set the iommu-ops | |
796 | * afterwards. | |
797 | */ | |
b22f6434 | 798 | int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops) |
fc2100eb | 799 | { |
ff21776d JR |
800 | if (bus->iommu_ops != NULL) |
801 | return -EBUSY; | |
fc2100eb | 802 | |
ff21776d JR |
803 | bus->iommu_ops = ops; |
804 | ||
805 | /* Do IOMMU specific setup for this bus-type */ | |
806 | iommu_bus_init(bus, ops); | |
fc2100eb | 807 | |
ff21776d | 808 | return 0; |
fc2100eb | 809 | } |
ff21776d | 810 | EXPORT_SYMBOL_GPL(bus_set_iommu); |
fc2100eb | 811 | |
a1b60c1c | 812 | bool iommu_present(struct bus_type *bus) |
fc2100eb | 813 | { |
94441c3b | 814 | return bus->iommu_ops != NULL; |
fc2100eb | 815 | } |
a1b60c1c | 816 | EXPORT_SYMBOL_GPL(iommu_present); |
fc2100eb | 817 | |
4f3f8d9d OBC |
818 | /** |
819 | * iommu_set_fault_handler() - set a fault handler for an iommu domain | |
820 | * @domain: iommu domain | |
821 | * @handler: fault handler | |
77ca2332 | 822 | * @token: user data, will be passed back to the fault handler |
0ed6d2d2 OBC |
823 | * |
824 | * This function should be used by IOMMU users which want to be notified | |
825 | * whenever an IOMMU fault happens. | |
826 | * | |
827 | * The fault handler itself should return 0 on success, and an appropriate | |
828 | * error code otherwise. | |
4f3f8d9d OBC |
829 | */ |
830 | void iommu_set_fault_handler(struct iommu_domain *domain, | |
77ca2332 OBC |
831 | iommu_fault_handler_t handler, |
832 | void *token) | |
4f3f8d9d OBC |
833 | { |
834 | BUG_ON(!domain); | |
835 | ||
836 | domain->handler = handler; | |
77ca2332 | 837 | domain->handler_token = token; |
4f3f8d9d | 838 | } |
30bd918c | 839 | EXPORT_SYMBOL_GPL(iommu_set_fault_handler); |
4f3f8d9d | 840 | |
905d66c1 | 841 | struct iommu_domain *iommu_domain_alloc(struct bus_type *bus) |
fc2100eb JR |
842 | { |
843 | struct iommu_domain *domain; | |
844 | int ret; | |
845 | ||
94441c3b | 846 | if (bus == NULL || bus->iommu_ops == NULL) |
905d66c1 JR |
847 | return NULL; |
848 | ||
8bd6960c | 849 | domain = kzalloc(sizeof(*domain), GFP_KERNEL); |
fc2100eb JR |
850 | if (!domain) |
851 | return NULL; | |
852 | ||
94441c3b | 853 | domain->ops = bus->iommu_ops; |
905d66c1 | 854 | |
94441c3b | 855 | ret = domain->ops->domain_init(domain); |
fc2100eb JR |
856 | if (ret) |
857 | goto out_free; | |
858 | ||
859 | return domain; | |
860 | ||
861 | out_free: | |
862 | kfree(domain); | |
863 | ||
864 | return NULL; | |
865 | } | |
866 | EXPORT_SYMBOL_GPL(iommu_domain_alloc); | |
867 | ||
868 | void iommu_domain_free(struct iommu_domain *domain) | |
869 | { | |
e5aa7f00 JR |
870 | if (likely(domain->ops->domain_destroy != NULL)) |
871 | domain->ops->domain_destroy(domain); | |
872 | ||
fc2100eb JR |
873 | kfree(domain); |
874 | } | |
875 | EXPORT_SYMBOL_GPL(iommu_domain_free); | |
876 | ||
877 | int iommu_attach_device(struct iommu_domain *domain, struct device *dev) | |
878 | { | |
b54db778 | 879 | int ret; |
e5aa7f00 JR |
880 | if (unlikely(domain->ops->attach_dev == NULL)) |
881 | return -ENODEV; | |
882 | ||
b54db778 SK |
883 | ret = domain->ops->attach_dev(domain, dev); |
884 | if (!ret) | |
885 | trace_attach_device_to_domain(dev); | |
886 | return ret; | |
fc2100eb JR |
887 | } |
888 | EXPORT_SYMBOL_GPL(iommu_attach_device); | |
889 | ||
890 | void iommu_detach_device(struct iommu_domain *domain, struct device *dev) | |
891 | { | |
e5aa7f00 JR |
892 | if (unlikely(domain->ops->detach_dev == NULL)) |
893 | return; | |
894 | ||
895 | domain->ops->detach_dev(domain, dev); | |
69980630 | 896 | trace_detach_device_from_domain(dev); |
fc2100eb JR |
897 | } |
898 | EXPORT_SYMBOL_GPL(iommu_detach_device); | |
899 | ||
d72e31c9 AW |
900 | /* |
901 | * IOMMU groups are really the natrual working unit of the IOMMU, but | |
902 | * the IOMMU API works on domains and devices. Bridge that gap by | |
903 | * iterating over the devices in a group. Ideally we'd have a single | |
904 | * device which represents the requestor ID of the group, but we also | |
905 | * allow IOMMU drivers to create policy defined minimum sets, where | |
906 | * the physical hardware may be able to distiguish members, but we | |
907 | * wish to group them at a higher level (ex. untrusted multi-function | |
908 | * PCI devices). Thus we attach each device. | |
909 | */ | |
910 | static int iommu_group_do_attach_device(struct device *dev, void *data) | |
911 | { | |
912 | struct iommu_domain *domain = data; | |
913 | ||
914 | return iommu_attach_device(domain, dev); | |
915 | } | |
916 | ||
917 | int iommu_attach_group(struct iommu_domain *domain, struct iommu_group *group) | |
918 | { | |
919 | return iommu_group_for_each_dev(group, domain, | |
920 | iommu_group_do_attach_device); | |
921 | } | |
922 | EXPORT_SYMBOL_GPL(iommu_attach_group); | |
923 | ||
924 | static int iommu_group_do_detach_device(struct device *dev, void *data) | |
925 | { | |
926 | struct iommu_domain *domain = data; | |
927 | ||
928 | iommu_detach_device(domain, dev); | |
929 | ||
930 | return 0; | |
931 | } | |
932 | ||
933 | void iommu_detach_group(struct iommu_domain *domain, struct iommu_group *group) | |
934 | { | |
935 | iommu_group_for_each_dev(group, domain, iommu_group_do_detach_device); | |
936 | } | |
937 | EXPORT_SYMBOL_GPL(iommu_detach_group); | |
938 | ||
bb5547ac | 939 | phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova) |
fc2100eb | 940 | { |
e5aa7f00 JR |
941 | if (unlikely(domain->ops->iova_to_phys == NULL)) |
942 | return 0; | |
943 | ||
944 | return domain->ops->iova_to_phys(domain, iova); | |
fc2100eb JR |
945 | } |
946 | EXPORT_SYMBOL_GPL(iommu_iova_to_phys); | |
dbb9fd86 SY |
947 | |
948 | int iommu_domain_has_cap(struct iommu_domain *domain, | |
949 | unsigned long cap) | |
950 | { | |
e5aa7f00 JR |
951 | if (unlikely(domain->ops->domain_has_cap == NULL)) |
952 | return 0; | |
953 | ||
954 | return domain->ops->domain_has_cap(domain, cap); | |
dbb9fd86 SY |
955 | } |
956 | EXPORT_SYMBOL_GPL(iommu_domain_has_cap); | |
cefc53c7 | 957 | |
bd13969b AW |
958 | static size_t iommu_pgsize(struct iommu_domain *domain, |
959 | unsigned long addr_merge, size_t size) | |
960 | { | |
961 | unsigned int pgsize_idx; | |
962 | size_t pgsize; | |
963 | ||
964 | /* Max page size that still fits into 'size' */ | |
965 | pgsize_idx = __fls(size); | |
966 | ||
967 | /* need to consider alignment requirements ? */ | |
968 | if (likely(addr_merge)) { | |
969 | /* Max page size allowed by address */ | |
970 | unsigned int align_pgsize_idx = __ffs(addr_merge); | |
971 | pgsize_idx = min(pgsize_idx, align_pgsize_idx); | |
972 | } | |
973 | ||
974 | /* build a mask of acceptable page sizes */ | |
975 | pgsize = (1UL << (pgsize_idx + 1)) - 1; | |
976 | ||
977 | /* throw away page sizes not supported by the hardware */ | |
978 | pgsize &= domain->ops->pgsize_bitmap; | |
979 | ||
980 | /* make sure we're still sane */ | |
981 | BUG_ON(!pgsize); | |
982 | ||
983 | /* pick the biggest page */ | |
984 | pgsize_idx = __fls(pgsize); | |
985 | pgsize = 1UL << pgsize_idx; | |
986 | ||
987 | return pgsize; | |
988 | } | |
989 | ||
cefc53c7 | 990 | int iommu_map(struct iommu_domain *domain, unsigned long iova, |
7d3002cc | 991 | phys_addr_t paddr, size_t size, int prot) |
cefc53c7 | 992 | { |
7d3002cc OBC |
993 | unsigned long orig_iova = iova; |
994 | unsigned int min_pagesz; | |
995 | size_t orig_size = size; | |
996 | int ret = 0; | |
cefc53c7 | 997 | |
57886518 JR |
998 | if (unlikely(domain->ops->unmap == NULL || |
999 | domain->ops->pgsize_bitmap == 0UL)) | |
e5aa7f00 | 1000 | return -ENODEV; |
cefc53c7 | 1001 | |
7d3002cc OBC |
1002 | /* find out the minimum page size supported */ |
1003 | min_pagesz = 1 << __ffs(domain->ops->pgsize_bitmap); | |
1004 | ||
1005 | /* | |
1006 | * both the virtual address and the physical one, as well as | |
1007 | * the size of the mapping, must be aligned (at least) to the | |
1008 | * size of the smallest page supported by the hardware | |
1009 | */ | |
1010 | if (!IS_ALIGNED(iova | paddr | size, min_pagesz)) { | |
abedb049 | 1011 | pr_err("unaligned: iova 0x%lx pa %pa size 0x%zx min_pagesz 0x%x\n", |
6197ca82 | 1012 | iova, &paddr, size, min_pagesz); |
7d3002cc OBC |
1013 | return -EINVAL; |
1014 | } | |
1015 | ||
abedb049 | 1016 | pr_debug("map: iova 0x%lx pa %pa size 0x%zx\n", iova, &paddr, size); |
7d3002cc OBC |
1017 | |
1018 | while (size) { | |
bd13969b | 1019 | size_t pgsize = iommu_pgsize(domain, iova | paddr, size); |
7d3002cc | 1020 | |
abedb049 | 1021 | pr_debug("mapping: iova 0x%lx pa %pa pgsize 0x%zx\n", |
6197ca82 | 1022 | iova, &paddr, pgsize); |
7d3002cc OBC |
1023 | |
1024 | ret = domain->ops->map(domain, iova, paddr, pgsize, prot); | |
1025 | if (ret) | |
1026 | break; | |
1027 | ||
1028 | iova += pgsize; | |
1029 | paddr += pgsize; | |
1030 | size -= pgsize; | |
1031 | } | |
1032 | ||
1033 | /* unroll mapping in case something went wrong */ | |
1034 | if (ret) | |
1035 | iommu_unmap(domain, orig_iova, orig_size - size); | |
e0be7c86 SK |
1036 | else |
1037 | trace_map(iova, paddr, size); | |
7d3002cc OBC |
1038 | |
1039 | return ret; | |
cefc53c7 JR |
1040 | } |
1041 | EXPORT_SYMBOL_GPL(iommu_map); | |
1042 | ||
7d3002cc | 1043 | size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova, size_t size) |
cefc53c7 | 1044 | { |
7d3002cc OBC |
1045 | size_t unmapped_page, unmapped = 0; |
1046 | unsigned int min_pagesz; | |
cefc53c7 | 1047 | |
57886518 JR |
1048 | if (unlikely(domain->ops->unmap == NULL || |
1049 | domain->ops->pgsize_bitmap == 0UL)) | |
e5aa7f00 JR |
1050 | return -ENODEV; |
1051 | ||
7d3002cc OBC |
1052 | /* find out the minimum page size supported */ |
1053 | min_pagesz = 1 << __ffs(domain->ops->pgsize_bitmap); | |
1054 | ||
1055 | /* | |
1056 | * The virtual address, as well as the size of the mapping, must be | |
1057 | * aligned (at least) to the size of the smallest page supported | |
1058 | * by the hardware | |
1059 | */ | |
1060 | if (!IS_ALIGNED(iova | size, min_pagesz)) { | |
6197ca82 JP |
1061 | pr_err("unaligned: iova 0x%lx size 0x%zx min_pagesz 0x%x\n", |
1062 | iova, size, min_pagesz); | |
7d3002cc OBC |
1063 | return -EINVAL; |
1064 | } | |
1065 | ||
6197ca82 | 1066 | pr_debug("unmap this: iova 0x%lx size 0x%zx\n", iova, size); |
7d3002cc OBC |
1067 | |
1068 | /* | |
1069 | * Keep iterating until we either unmap 'size' bytes (or more) | |
1070 | * or we hit an area that isn't mapped. | |
1071 | */ | |
1072 | while (unmapped < size) { | |
bd13969b | 1073 | size_t pgsize = iommu_pgsize(domain, iova, size - unmapped); |
7d3002cc | 1074 | |
bd13969b | 1075 | unmapped_page = domain->ops->unmap(domain, iova, pgsize); |
7d3002cc OBC |
1076 | if (!unmapped_page) |
1077 | break; | |
1078 | ||
6197ca82 JP |
1079 | pr_debug("unmapped: iova 0x%lx size 0x%zx\n", |
1080 | iova, unmapped_page); | |
7d3002cc OBC |
1081 | |
1082 | iova += unmapped_page; | |
1083 | unmapped += unmapped_page; | |
1084 | } | |
1085 | ||
3a50639c | 1086 | trace_unmap(iova, 0, size); |
7d3002cc | 1087 | return unmapped; |
cefc53c7 JR |
1088 | } |
1089 | EXPORT_SYMBOL_GPL(iommu_unmap); | |
1460432c | 1090 | |
d7787d57 JR |
1091 | |
1092 | int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr, | |
80f97f0f | 1093 | phys_addr_t paddr, u64 size, int prot) |
d7787d57 JR |
1094 | { |
1095 | if (unlikely(domain->ops->domain_window_enable == NULL)) | |
1096 | return -ENODEV; | |
1097 | ||
80f97f0f VS |
1098 | return domain->ops->domain_window_enable(domain, wnd_nr, paddr, size, |
1099 | prot); | |
d7787d57 JR |
1100 | } |
1101 | EXPORT_SYMBOL_GPL(iommu_domain_window_enable); | |
1102 | ||
1103 | void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr) | |
1104 | { | |
1105 | if (unlikely(domain->ops->domain_window_disable == NULL)) | |
1106 | return; | |
1107 | ||
1108 | return domain->ops->domain_window_disable(domain, wnd_nr); | |
1109 | } | |
1110 | EXPORT_SYMBOL_GPL(iommu_domain_window_disable); | |
1111 | ||
d72e31c9 | 1112 | static int __init iommu_init(void) |
1460432c | 1113 | { |
d72e31c9 AW |
1114 | iommu_group_kset = kset_create_and_add("iommu_groups", |
1115 | NULL, kernel_kobj); | |
1116 | ida_init(&iommu_group_ida); | |
1117 | mutex_init(&iommu_group_mutex); | |
1460432c | 1118 | |
d72e31c9 AW |
1119 | BUG_ON(!iommu_group_kset); |
1120 | ||
1121 | return 0; | |
1460432c | 1122 | } |
097e3635 | 1123 | arch_initcall(iommu_init); |
0cd76dd1 JR |
1124 | |
1125 | int iommu_domain_get_attr(struct iommu_domain *domain, | |
1126 | enum iommu_attr attr, void *data) | |
1127 | { | |
0ff64f80 | 1128 | struct iommu_domain_geometry *geometry; |
d2e12160 | 1129 | bool *paging; |
0ff64f80 | 1130 | int ret = 0; |
69356712 | 1131 | u32 *count; |
0ff64f80 JR |
1132 | |
1133 | switch (attr) { | |
1134 | case DOMAIN_ATTR_GEOMETRY: | |
1135 | geometry = data; | |
1136 | *geometry = domain->geometry; | |
1137 | ||
d2e12160 JR |
1138 | break; |
1139 | case DOMAIN_ATTR_PAGING: | |
1140 | paging = data; | |
1141 | *paging = (domain->ops->pgsize_bitmap != 0UL); | |
69356712 JR |
1142 | break; |
1143 | case DOMAIN_ATTR_WINDOWS: | |
1144 | count = data; | |
1145 | ||
1146 | if (domain->ops->domain_get_windows != NULL) | |
1147 | *count = domain->ops->domain_get_windows(domain); | |
1148 | else | |
1149 | ret = -ENODEV; | |
1150 | ||
0ff64f80 JR |
1151 | break; |
1152 | default: | |
1153 | if (!domain->ops->domain_get_attr) | |
1154 | return -EINVAL; | |
0cd76dd1 | 1155 | |
0ff64f80 JR |
1156 | ret = domain->ops->domain_get_attr(domain, attr, data); |
1157 | } | |
1158 | ||
1159 | return ret; | |
0cd76dd1 JR |
1160 | } |
1161 | EXPORT_SYMBOL_GPL(iommu_domain_get_attr); | |
1162 | ||
1163 | int iommu_domain_set_attr(struct iommu_domain *domain, | |
1164 | enum iommu_attr attr, void *data) | |
1165 | { | |
69356712 JR |
1166 | int ret = 0; |
1167 | u32 *count; | |
1168 | ||
1169 | switch (attr) { | |
1170 | case DOMAIN_ATTR_WINDOWS: | |
1171 | count = data; | |
1172 | ||
1173 | if (domain->ops->domain_set_windows != NULL) | |
1174 | ret = domain->ops->domain_set_windows(domain, *count); | |
1175 | else | |
1176 | ret = -ENODEV; | |
1460432c | 1177 | |
69356712 JR |
1178 | break; |
1179 | default: | |
1180 | if (domain->ops->domain_set_attr == NULL) | |
1181 | return -EINVAL; | |
1182 | ||
1183 | ret = domain->ops->domain_set_attr(domain, attr, data); | |
1184 | } | |
1185 | ||
1186 | return ret; | |
1460432c | 1187 | } |
0cd76dd1 | 1188 | EXPORT_SYMBOL_GPL(iommu_domain_set_attr); |