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45051539 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
fc2100eb JR |
2 | /* |
3 | * Copyright (C) 2007-2008 Advanced Micro Devices, Inc. | |
63ce3ae8 | 4 | * Author: Joerg Roedel <jroedel@suse.de> |
fc2100eb JR |
5 | */ |
6 | ||
92e7066f | 7 | #define pr_fmt(fmt) "iommu: " fmt |
7d3002cc | 8 | |
905d66c1 | 9 | #include <linux/device.h> |
40998188 | 10 | #include <linux/kernel.h> |
fc2100eb JR |
11 | #include <linux/bug.h> |
12 | #include <linux/types.h> | |
c1af7b40 PG |
13 | #include <linux/init.h> |
14 | #include <linux/export.h> | |
60db4027 | 15 | #include <linux/slab.h> |
fc2100eb JR |
16 | #include <linux/errno.h> |
17 | #include <linux/iommu.h> | |
d72e31c9 AW |
18 | #include <linux/idr.h> |
19 | #include <linux/notifier.h> | |
20 | #include <linux/err.h> | |
104a1c13 | 21 | #include <linux/pci.h> |
f096c061 | 22 | #include <linux/bitops.h> |
57f98d2f | 23 | #include <linux/property.h> |
eab03e2a | 24 | #include <linux/fsl/mc.h> |
7f6db171 | 25 | #include <trace/events/iommu.h> |
d72e31c9 AW |
26 | |
27 | static struct kset *iommu_group_kset; | |
e38d1f13 | 28 | static DEFINE_IDA(iommu_group_ida); |
22bb182c JR |
29 | |
30 | static unsigned int iommu_def_domain_type __read_mostly; | |
68a6efe8 | 31 | static bool iommu_dma_strict __read_mostly = true; |
faf14989 | 32 | static u32 iommu_cmd_line __read_mostly; |
d72e31c9 AW |
33 | |
34 | struct iommu_group { | |
35 | struct kobject kobj; | |
36 | struct kobject *devices_kobj; | |
37 | struct list_head devices; | |
38 | struct mutex mutex; | |
39 | struct blocking_notifier_head notifier; | |
40 | void *iommu_data; | |
41 | void (*iommu_data_release)(void *iommu_data); | |
42 | char *name; | |
43 | int id; | |
53723dc5 | 44 | struct iommu_domain *default_domain; |
e39cb8a3 | 45 | struct iommu_domain *domain; |
d72e31c9 AW |
46 | }; |
47 | ||
c09e22d5 | 48 | struct group_device { |
d72e31c9 AW |
49 | struct list_head list; |
50 | struct device *dev; | |
51 | char *name; | |
52 | }; | |
53 | ||
54 | struct iommu_group_attribute { | |
55 | struct attribute attr; | |
56 | ssize_t (*show)(struct iommu_group *group, char *buf); | |
57 | ssize_t (*store)(struct iommu_group *group, | |
58 | const char *buf, size_t count); | |
59 | }; | |
60 | ||
bc7d12b9 | 61 | static const char * const iommu_group_resv_type_string[] = { |
adfd3738 EA |
62 | [IOMMU_RESV_DIRECT] = "direct", |
63 | [IOMMU_RESV_DIRECT_RELAXABLE] = "direct-relaxable", | |
64 | [IOMMU_RESV_RESERVED] = "reserved", | |
65 | [IOMMU_RESV_MSI] = "msi", | |
66 | [IOMMU_RESV_SW_MSI] = "msi", | |
bc7d12b9 EA |
67 | }; |
68 | ||
faf14989 JR |
69 | #define IOMMU_CMD_LINE_DMA_API BIT(0) |
70 | ||
71 | static void iommu_set_cmd_line_dma_api(void) | |
72 | { | |
73 | iommu_cmd_line |= IOMMU_CMD_LINE_DMA_API; | |
74 | } | |
75 | ||
22bb182c | 76 | static bool iommu_cmd_line_dma_api(void) |
faf14989 JR |
77 | { |
78 | return !!(iommu_cmd_line & IOMMU_CMD_LINE_DMA_API); | |
79 | } | |
80 | ||
d72e31c9 AW |
81 | #define IOMMU_GROUP_ATTR(_name, _mode, _show, _store) \ |
82 | struct iommu_group_attribute iommu_group_attr_##_name = \ | |
83 | __ATTR(_name, _mode, _show, _store) | |
fc2100eb | 84 | |
d72e31c9 AW |
85 | #define to_iommu_group_attr(_attr) \ |
86 | container_of(_attr, struct iommu_group_attribute, attr) | |
87 | #define to_iommu_group(_kobj) \ | |
88 | container_of(_kobj, struct iommu_group, kobj) | |
fc2100eb | 89 | |
b0119e87 JR |
90 | static LIST_HEAD(iommu_device_list); |
91 | static DEFINE_SPINLOCK(iommu_device_lock); | |
92 | ||
5fa9e7c5 JR |
93 | /* |
94 | * Use a function instead of an array here because the domain-type is a | |
95 | * bit-field, so an array would waste memory. | |
96 | */ | |
97 | static const char *iommu_domain_type_str(unsigned int t) | |
98 | { | |
99 | switch (t) { | |
100 | case IOMMU_DOMAIN_BLOCKED: | |
101 | return "Blocked"; | |
102 | case IOMMU_DOMAIN_IDENTITY: | |
103 | return "Passthrough"; | |
104 | case IOMMU_DOMAIN_UNMANAGED: | |
105 | return "Unmanaged"; | |
106 | case IOMMU_DOMAIN_DMA: | |
107 | return "Translated"; | |
108 | default: | |
109 | return "Unknown"; | |
110 | } | |
111 | } | |
112 | ||
113 | static int __init iommu_subsys_init(void) | |
114 | { | |
22bb182c JR |
115 | bool cmd_line = iommu_cmd_line_dma_api(); |
116 | ||
117 | if (!cmd_line) { | |
118 | if (IS_ENABLED(CONFIG_IOMMU_DEFAULT_PASSTHROUGH)) | |
119 | iommu_set_default_passthrough(false); | |
120 | else | |
121 | iommu_set_default_translated(false); | |
2cc13bb4 | 122 | |
2896ba40 JR |
123 | if (iommu_default_passthrough() && mem_encrypt_active()) { |
124 | pr_info("Memory encryption detected - Disabling default IOMMU Passthrough\n"); | |
2cc13bb4 JR |
125 | iommu_set_default_translated(false); |
126 | } | |
22bb182c JR |
127 | } |
128 | ||
129 | pr_info("Default domain type: %s %s\n", | |
130 | iommu_domain_type_str(iommu_def_domain_type), | |
131 | cmd_line ? "(set via kernel command line)" : ""); | |
5fa9e7c5 JR |
132 | |
133 | return 0; | |
134 | } | |
135 | subsys_initcall(iommu_subsys_init); | |
136 | ||
b0119e87 JR |
137 | int iommu_device_register(struct iommu_device *iommu) |
138 | { | |
139 | spin_lock(&iommu_device_lock); | |
140 | list_add_tail(&iommu->list, &iommu_device_list); | |
141 | spin_unlock(&iommu_device_lock); | |
b0119e87 JR |
142 | return 0; |
143 | } | |
144 | ||
145 | void iommu_device_unregister(struct iommu_device *iommu) | |
146 | { | |
147 | spin_lock(&iommu_device_lock); | |
148 | list_del(&iommu->list); | |
149 | spin_unlock(&iommu_device_lock); | |
150 | } | |
151 | ||
0c830e6b JP |
152 | static struct iommu_param *iommu_get_dev_param(struct device *dev) |
153 | { | |
154 | struct iommu_param *param = dev->iommu_param; | |
155 | ||
156 | if (param) | |
157 | return param; | |
158 | ||
159 | param = kzalloc(sizeof(*param), GFP_KERNEL); | |
160 | if (!param) | |
161 | return NULL; | |
162 | ||
163 | mutex_init(¶m->lock); | |
164 | dev->iommu_param = param; | |
165 | return param; | |
166 | } | |
167 | ||
168 | static void iommu_free_dev_param(struct device *dev) | |
169 | { | |
170 | kfree(dev->iommu_param); | |
171 | dev->iommu_param = NULL; | |
172 | } | |
173 | ||
cc5aed44 JR |
174 | int iommu_probe_device(struct device *dev) |
175 | { | |
176 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
0c830e6b | 177 | int ret; |
cc5aed44 JR |
178 | |
179 | WARN_ON(dev->iommu_group); | |
0c830e6b JP |
180 | if (!ops) |
181 | return -EINVAL; | |
cc5aed44 | 182 | |
0c830e6b JP |
183 | if (!iommu_get_dev_param(dev)) |
184 | return -ENOMEM; | |
cc5aed44 | 185 | |
0c830e6b JP |
186 | ret = ops->add_device(dev); |
187 | if (ret) | |
188 | iommu_free_dev_param(dev); | |
dc9de8a2 JR |
189 | |
190 | return ret; | |
cc5aed44 JR |
191 | } |
192 | ||
193 | void iommu_release_device(struct device *dev) | |
194 | { | |
195 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
196 | ||
197 | if (dev->iommu_group) | |
198 | ops->remove_device(dev); | |
0c830e6b JP |
199 | |
200 | iommu_free_dev_param(dev); | |
cc5aed44 JR |
201 | } |
202 | ||
53723dc5 JR |
203 | static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus, |
204 | unsigned type); | |
e39cb8a3 JR |
205 | static int __iommu_attach_device(struct iommu_domain *domain, |
206 | struct device *dev); | |
207 | static int __iommu_attach_group(struct iommu_domain *domain, | |
208 | struct iommu_group *group); | |
209 | static void __iommu_detach_group(struct iommu_domain *domain, | |
210 | struct iommu_group *group); | |
53723dc5 | 211 | |
fccb4e3b WD |
212 | static int __init iommu_set_def_domain_type(char *str) |
213 | { | |
214 | bool pt; | |
7f9584df | 215 | int ret; |
fccb4e3b | 216 | |
7f9584df AS |
217 | ret = kstrtobool(str, &pt); |
218 | if (ret) | |
219 | return ret; | |
fccb4e3b | 220 | |
adab0b07 JR |
221 | if (pt) |
222 | iommu_set_default_passthrough(true); | |
223 | else | |
224 | iommu_set_default_translated(true); | |
faf14989 | 225 | |
fccb4e3b WD |
226 | return 0; |
227 | } | |
228 | early_param("iommu.passthrough", iommu_set_def_domain_type); | |
229 | ||
68a6efe8 ZL |
230 | static int __init iommu_dma_setup(char *str) |
231 | { | |
232 | return kstrtobool(str, &iommu_dma_strict); | |
233 | } | |
234 | early_param("iommu.strict", iommu_dma_setup); | |
235 | ||
d72e31c9 AW |
236 | static ssize_t iommu_group_attr_show(struct kobject *kobj, |
237 | struct attribute *__attr, char *buf) | |
1460432c | 238 | { |
d72e31c9 AW |
239 | struct iommu_group_attribute *attr = to_iommu_group_attr(__attr); |
240 | struct iommu_group *group = to_iommu_group(kobj); | |
241 | ssize_t ret = -EIO; | |
1460432c | 242 | |
d72e31c9 AW |
243 | if (attr->show) |
244 | ret = attr->show(group, buf); | |
245 | return ret; | |
246 | } | |
247 | ||
248 | static ssize_t iommu_group_attr_store(struct kobject *kobj, | |
249 | struct attribute *__attr, | |
250 | const char *buf, size_t count) | |
251 | { | |
252 | struct iommu_group_attribute *attr = to_iommu_group_attr(__attr); | |
253 | struct iommu_group *group = to_iommu_group(kobj); | |
254 | ssize_t ret = -EIO; | |
1460432c | 255 | |
d72e31c9 AW |
256 | if (attr->store) |
257 | ret = attr->store(group, buf, count); | |
258 | return ret; | |
1460432c | 259 | } |
1460432c | 260 | |
d72e31c9 AW |
261 | static const struct sysfs_ops iommu_group_sysfs_ops = { |
262 | .show = iommu_group_attr_show, | |
263 | .store = iommu_group_attr_store, | |
264 | }; | |
1460432c | 265 | |
d72e31c9 AW |
266 | static int iommu_group_create_file(struct iommu_group *group, |
267 | struct iommu_group_attribute *attr) | |
268 | { | |
269 | return sysfs_create_file(&group->kobj, &attr->attr); | |
1460432c | 270 | } |
1460432c | 271 | |
d72e31c9 AW |
272 | static void iommu_group_remove_file(struct iommu_group *group, |
273 | struct iommu_group_attribute *attr) | |
274 | { | |
275 | sysfs_remove_file(&group->kobj, &attr->attr); | |
276 | } | |
277 | ||
278 | static ssize_t iommu_group_show_name(struct iommu_group *group, char *buf) | |
279 | { | |
280 | return sprintf(buf, "%s\n", group->name); | |
281 | } | |
282 | ||
6c65fb31 EA |
283 | /** |
284 | * iommu_insert_resv_region - Insert a new region in the | |
285 | * list of reserved regions. | |
286 | * @new: new region to insert | |
287 | * @regions: list of regions | |
288 | * | |
4dbd258f EA |
289 | * Elements are sorted by start address and overlapping segments |
290 | * of the same type are merged. | |
6c65fb31 | 291 | */ |
4dbd258f EA |
292 | int iommu_insert_resv_region(struct iommu_resv_region *new, |
293 | struct list_head *regions) | |
6c65fb31 | 294 | { |
4dbd258f EA |
295 | struct iommu_resv_region *iter, *tmp, *nr, *top; |
296 | LIST_HEAD(stack); | |
297 | ||
298 | nr = iommu_alloc_resv_region(new->start, new->length, | |
299 | new->prot, new->type); | |
300 | if (!nr) | |
301 | return -ENOMEM; | |
302 | ||
303 | /* First add the new element based on start address sorting */ | |
304 | list_for_each_entry(iter, regions, list) { | |
305 | if (nr->start < iter->start || | |
306 | (nr->start == iter->start && nr->type <= iter->type)) | |
307 | break; | |
308 | } | |
309 | list_add_tail(&nr->list, &iter->list); | |
310 | ||
311 | /* Merge overlapping segments of type nr->type in @regions, if any */ | |
312 | list_for_each_entry_safe(iter, tmp, regions, list) { | |
313 | phys_addr_t top_end, iter_end = iter->start + iter->length - 1; | |
314 | ||
6a71ce7b EA |
315 | /* no merge needed on elements of different types than @new */ |
316 | if (iter->type != new->type) { | |
4dbd258f EA |
317 | list_move_tail(&iter->list, &stack); |
318 | continue; | |
319 | } | |
320 | ||
321 | /* look for the last stack element of same type as @iter */ | |
322 | list_for_each_entry_reverse(top, &stack, list) | |
323 | if (top->type == iter->type) | |
324 | goto check_overlap; | |
325 | ||
326 | list_move_tail(&iter->list, &stack); | |
327 | continue; | |
328 | ||
329 | check_overlap: | |
330 | top_end = top->start + top->length - 1; | |
331 | ||
332 | if (iter->start > top_end + 1) { | |
333 | list_move_tail(&iter->list, &stack); | |
6c65fb31 | 334 | } else { |
4dbd258f EA |
335 | top->length = max(top_end, iter_end) - top->start + 1; |
336 | list_del(&iter->list); | |
337 | kfree(iter); | |
6c65fb31 EA |
338 | } |
339 | } | |
4dbd258f | 340 | list_splice(&stack, regions); |
6c65fb31 EA |
341 | return 0; |
342 | } | |
343 | ||
344 | static int | |
345 | iommu_insert_device_resv_regions(struct list_head *dev_resv_regions, | |
346 | struct list_head *group_resv_regions) | |
347 | { | |
348 | struct iommu_resv_region *entry; | |
a514a6e2 | 349 | int ret = 0; |
6c65fb31 EA |
350 | |
351 | list_for_each_entry(entry, dev_resv_regions, list) { | |
352 | ret = iommu_insert_resv_region(entry, group_resv_regions); | |
353 | if (ret) | |
354 | break; | |
355 | } | |
356 | return ret; | |
357 | } | |
358 | ||
359 | int iommu_get_group_resv_regions(struct iommu_group *group, | |
360 | struct list_head *head) | |
361 | { | |
8d2932dd | 362 | struct group_device *device; |
6c65fb31 EA |
363 | int ret = 0; |
364 | ||
365 | mutex_lock(&group->mutex); | |
366 | list_for_each_entry(device, &group->devices, list) { | |
367 | struct list_head dev_resv_regions; | |
368 | ||
369 | INIT_LIST_HEAD(&dev_resv_regions); | |
370 | iommu_get_resv_regions(device->dev, &dev_resv_regions); | |
371 | ret = iommu_insert_device_resv_regions(&dev_resv_regions, head); | |
372 | iommu_put_resv_regions(device->dev, &dev_resv_regions); | |
373 | if (ret) | |
374 | break; | |
375 | } | |
376 | mutex_unlock(&group->mutex); | |
377 | return ret; | |
378 | } | |
379 | EXPORT_SYMBOL_GPL(iommu_get_group_resv_regions); | |
380 | ||
bc7d12b9 EA |
381 | static ssize_t iommu_group_show_resv_regions(struct iommu_group *group, |
382 | char *buf) | |
383 | { | |
384 | struct iommu_resv_region *region, *next; | |
385 | struct list_head group_resv_regions; | |
386 | char *str = buf; | |
387 | ||
388 | INIT_LIST_HEAD(&group_resv_regions); | |
389 | iommu_get_group_resv_regions(group, &group_resv_regions); | |
390 | ||
391 | list_for_each_entry_safe(region, next, &group_resv_regions, list) { | |
392 | str += sprintf(str, "0x%016llx 0x%016llx %s\n", | |
393 | (long long int)region->start, | |
394 | (long long int)(region->start + | |
395 | region->length - 1), | |
396 | iommu_group_resv_type_string[region->type]); | |
397 | kfree(region); | |
398 | } | |
399 | ||
400 | return (str - buf); | |
401 | } | |
402 | ||
c52c72d3 OJ |
403 | static ssize_t iommu_group_show_type(struct iommu_group *group, |
404 | char *buf) | |
405 | { | |
406 | char *type = "unknown\n"; | |
407 | ||
408 | if (group->default_domain) { | |
409 | switch (group->default_domain->type) { | |
410 | case IOMMU_DOMAIN_BLOCKED: | |
411 | type = "blocked\n"; | |
412 | break; | |
413 | case IOMMU_DOMAIN_IDENTITY: | |
414 | type = "identity\n"; | |
415 | break; | |
416 | case IOMMU_DOMAIN_UNMANAGED: | |
417 | type = "unmanaged\n"; | |
418 | break; | |
419 | case IOMMU_DOMAIN_DMA: | |
24f307d8 | 420 | type = "DMA\n"; |
c52c72d3 OJ |
421 | break; |
422 | } | |
423 | } | |
424 | strcpy(buf, type); | |
425 | ||
426 | return strlen(type); | |
427 | } | |
428 | ||
d72e31c9 AW |
429 | static IOMMU_GROUP_ATTR(name, S_IRUGO, iommu_group_show_name, NULL); |
430 | ||
bc7d12b9 EA |
431 | static IOMMU_GROUP_ATTR(reserved_regions, 0444, |
432 | iommu_group_show_resv_regions, NULL); | |
433 | ||
c52c72d3 OJ |
434 | static IOMMU_GROUP_ATTR(type, 0444, iommu_group_show_type, NULL); |
435 | ||
d72e31c9 AW |
436 | static void iommu_group_release(struct kobject *kobj) |
437 | { | |
438 | struct iommu_group *group = to_iommu_group(kobj); | |
439 | ||
269aa808 JR |
440 | pr_debug("Releasing group %d\n", group->id); |
441 | ||
d72e31c9 AW |
442 | if (group->iommu_data_release) |
443 | group->iommu_data_release(group->iommu_data); | |
444 | ||
feccf398 | 445 | ida_simple_remove(&iommu_group_ida, group->id); |
d72e31c9 | 446 | |
53723dc5 JR |
447 | if (group->default_domain) |
448 | iommu_domain_free(group->default_domain); | |
449 | ||
d72e31c9 AW |
450 | kfree(group->name); |
451 | kfree(group); | |
452 | } | |
453 | ||
454 | static struct kobj_type iommu_group_ktype = { | |
455 | .sysfs_ops = &iommu_group_sysfs_ops, | |
456 | .release = iommu_group_release, | |
457 | }; | |
458 | ||
459 | /** | |
460 | * iommu_group_alloc - Allocate a new group | |
d72e31c9 AW |
461 | * |
462 | * This function is called by an iommu driver to allocate a new iommu | |
463 | * group. The iommu group represents the minimum granularity of the iommu. | |
464 | * Upon successful return, the caller holds a reference to the supplied | |
465 | * group in order to hold the group until devices are added. Use | |
466 | * iommu_group_put() to release this extra reference count, allowing the | |
467 | * group to be automatically reclaimed once it has no devices or external | |
468 | * references. | |
469 | */ | |
470 | struct iommu_group *iommu_group_alloc(void) | |
1460432c | 471 | { |
d72e31c9 AW |
472 | struct iommu_group *group; |
473 | int ret; | |
474 | ||
475 | group = kzalloc(sizeof(*group), GFP_KERNEL); | |
476 | if (!group) | |
477 | return ERR_PTR(-ENOMEM); | |
478 | ||
479 | group->kobj.kset = iommu_group_kset; | |
480 | mutex_init(&group->mutex); | |
481 | INIT_LIST_HEAD(&group->devices); | |
482 | BLOCKING_INIT_NOTIFIER_HEAD(&group->notifier); | |
483 | ||
feccf398 HK |
484 | ret = ida_simple_get(&iommu_group_ida, 0, 0, GFP_KERNEL); |
485 | if (ret < 0) { | |
d72e31c9 | 486 | kfree(group); |
feccf398 | 487 | return ERR_PTR(ret); |
d72e31c9 | 488 | } |
feccf398 | 489 | group->id = ret; |
1460432c | 490 | |
d72e31c9 AW |
491 | ret = kobject_init_and_add(&group->kobj, &iommu_group_ktype, |
492 | NULL, "%d", group->id); | |
493 | if (ret) { | |
feccf398 | 494 | ida_simple_remove(&iommu_group_ida, group->id); |
52db2e28 | 495 | kobject_put(&group->kobj); |
d72e31c9 AW |
496 | return ERR_PTR(ret); |
497 | } | |
498 | ||
499 | group->devices_kobj = kobject_create_and_add("devices", &group->kobj); | |
500 | if (!group->devices_kobj) { | |
501 | kobject_put(&group->kobj); /* triggers .release & free */ | |
502 | return ERR_PTR(-ENOMEM); | |
503 | } | |
504 | ||
505 | /* | |
506 | * The devices_kobj holds a reference on the group kobject, so | |
507 | * as long as that exists so will the group. We can therefore | |
508 | * use the devices_kobj for reference counting. | |
509 | */ | |
510 | kobject_put(&group->kobj); | |
511 | ||
bc7d12b9 EA |
512 | ret = iommu_group_create_file(group, |
513 | &iommu_group_attr_reserved_regions); | |
514 | if (ret) | |
515 | return ERR_PTR(ret); | |
516 | ||
c52c72d3 OJ |
517 | ret = iommu_group_create_file(group, &iommu_group_attr_type); |
518 | if (ret) | |
519 | return ERR_PTR(ret); | |
520 | ||
269aa808 JR |
521 | pr_debug("Allocated group %d\n", group->id); |
522 | ||
d72e31c9 AW |
523 | return group; |
524 | } | |
525 | EXPORT_SYMBOL_GPL(iommu_group_alloc); | |
526 | ||
aa16bea9 AK |
527 | struct iommu_group *iommu_group_get_by_id(int id) |
528 | { | |
529 | struct kobject *group_kobj; | |
530 | struct iommu_group *group; | |
531 | const char *name; | |
532 | ||
533 | if (!iommu_group_kset) | |
534 | return NULL; | |
535 | ||
536 | name = kasprintf(GFP_KERNEL, "%d", id); | |
537 | if (!name) | |
538 | return NULL; | |
539 | ||
540 | group_kobj = kset_find_obj(iommu_group_kset, name); | |
541 | kfree(name); | |
542 | ||
543 | if (!group_kobj) | |
544 | return NULL; | |
545 | ||
546 | group = container_of(group_kobj, struct iommu_group, kobj); | |
547 | BUG_ON(group->id != id); | |
548 | ||
549 | kobject_get(group->devices_kobj); | |
550 | kobject_put(&group->kobj); | |
551 | ||
552 | return group; | |
553 | } | |
554 | EXPORT_SYMBOL_GPL(iommu_group_get_by_id); | |
555 | ||
d72e31c9 AW |
556 | /** |
557 | * iommu_group_get_iommudata - retrieve iommu_data registered for a group | |
558 | * @group: the group | |
559 | * | |
560 | * iommu drivers can store data in the group for use when doing iommu | |
561 | * operations. This function provides a way to retrieve it. Caller | |
562 | * should hold a group reference. | |
563 | */ | |
564 | void *iommu_group_get_iommudata(struct iommu_group *group) | |
565 | { | |
566 | return group->iommu_data; | |
567 | } | |
568 | EXPORT_SYMBOL_GPL(iommu_group_get_iommudata); | |
569 | ||
570 | /** | |
571 | * iommu_group_set_iommudata - set iommu_data for a group | |
572 | * @group: the group | |
573 | * @iommu_data: new data | |
574 | * @release: release function for iommu_data | |
575 | * | |
576 | * iommu drivers can store data in the group for use when doing iommu | |
577 | * operations. This function provides a way to set the data after | |
578 | * the group has been allocated. Caller should hold a group reference. | |
579 | */ | |
580 | void iommu_group_set_iommudata(struct iommu_group *group, void *iommu_data, | |
581 | void (*release)(void *iommu_data)) | |
1460432c | 582 | { |
d72e31c9 AW |
583 | group->iommu_data = iommu_data; |
584 | group->iommu_data_release = release; | |
585 | } | |
586 | EXPORT_SYMBOL_GPL(iommu_group_set_iommudata); | |
1460432c | 587 | |
d72e31c9 AW |
588 | /** |
589 | * iommu_group_set_name - set name for a group | |
590 | * @group: the group | |
591 | * @name: name | |
592 | * | |
593 | * Allow iommu driver to set a name for a group. When set it will | |
594 | * appear in a name attribute file under the group in sysfs. | |
595 | */ | |
596 | int iommu_group_set_name(struct iommu_group *group, const char *name) | |
597 | { | |
598 | int ret; | |
599 | ||
600 | if (group->name) { | |
601 | iommu_group_remove_file(group, &iommu_group_attr_name); | |
602 | kfree(group->name); | |
603 | group->name = NULL; | |
604 | if (!name) | |
605 | return 0; | |
606 | } | |
607 | ||
608 | group->name = kstrdup(name, GFP_KERNEL); | |
609 | if (!group->name) | |
610 | return -ENOMEM; | |
611 | ||
612 | ret = iommu_group_create_file(group, &iommu_group_attr_name); | |
613 | if (ret) { | |
614 | kfree(group->name); | |
615 | group->name = NULL; | |
616 | return ret; | |
617 | } | |
1460432c AW |
618 | |
619 | return 0; | |
620 | } | |
d72e31c9 | 621 | EXPORT_SYMBOL_GPL(iommu_group_set_name); |
1460432c | 622 | |
beed2821 JR |
623 | static int iommu_group_create_direct_mappings(struct iommu_group *group, |
624 | struct device *dev) | |
625 | { | |
626 | struct iommu_domain *domain = group->default_domain; | |
e5b5234a | 627 | struct iommu_resv_region *entry; |
beed2821 JR |
628 | struct list_head mappings; |
629 | unsigned long pg_size; | |
630 | int ret = 0; | |
631 | ||
632 | if (!domain || domain->type != IOMMU_DOMAIN_DMA) | |
633 | return 0; | |
634 | ||
d16e0faa | 635 | BUG_ON(!domain->pgsize_bitmap); |
beed2821 | 636 | |
d16e0faa | 637 | pg_size = 1UL << __ffs(domain->pgsize_bitmap); |
beed2821 JR |
638 | INIT_LIST_HEAD(&mappings); |
639 | ||
e5b5234a | 640 | iommu_get_resv_regions(dev, &mappings); |
beed2821 JR |
641 | |
642 | /* We need to consider overlapping regions for different devices */ | |
643 | list_for_each_entry(entry, &mappings, list) { | |
644 | dma_addr_t start, end, addr; | |
645 | ||
e5b5234a EA |
646 | if (domain->ops->apply_resv_region) |
647 | domain->ops->apply_resv_region(dev, domain, entry); | |
33b21a6b | 648 | |
beed2821 JR |
649 | start = ALIGN(entry->start, pg_size); |
650 | end = ALIGN(entry->start + entry->length, pg_size); | |
651 | ||
adfd3738 EA |
652 | if (entry->type != IOMMU_RESV_DIRECT && |
653 | entry->type != IOMMU_RESV_DIRECT_RELAXABLE) | |
544a25d9 EA |
654 | continue; |
655 | ||
beed2821 JR |
656 | for (addr = start; addr < end; addr += pg_size) { |
657 | phys_addr_t phys_addr; | |
658 | ||
659 | phys_addr = iommu_iova_to_phys(domain, addr); | |
660 | if (phys_addr) | |
661 | continue; | |
662 | ||
663 | ret = iommu_map(domain, addr, addr, pg_size, entry->prot); | |
664 | if (ret) | |
665 | goto out; | |
666 | } | |
667 | ||
668 | } | |
669 | ||
add02cfd JR |
670 | iommu_flush_tlb_all(domain); |
671 | ||
beed2821 | 672 | out: |
e5b5234a | 673 | iommu_put_resv_regions(dev, &mappings); |
beed2821 JR |
674 | |
675 | return ret; | |
676 | } | |
677 | ||
d72e31c9 AW |
678 | /** |
679 | * iommu_group_add_device - add a device to an iommu group | |
680 | * @group: the group into which to add the device (reference should be held) | |
681 | * @dev: the device | |
682 | * | |
683 | * This function is called by an iommu driver to add a device into a | |
684 | * group. Adding a device increments the group reference count. | |
685 | */ | |
686 | int iommu_group_add_device(struct iommu_group *group, struct device *dev) | |
1460432c | 687 | { |
d72e31c9 | 688 | int ret, i = 0; |
c09e22d5 | 689 | struct group_device *device; |
d72e31c9 AW |
690 | |
691 | device = kzalloc(sizeof(*device), GFP_KERNEL); | |
692 | if (!device) | |
693 | return -ENOMEM; | |
694 | ||
695 | device->dev = dev; | |
1460432c | 696 | |
d72e31c9 | 697 | ret = sysfs_create_link(&dev->kobj, &group->kobj, "iommu_group"); |
797a8b4d RM |
698 | if (ret) |
699 | goto err_free_device; | |
d72e31c9 AW |
700 | |
701 | device->name = kasprintf(GFP_KERNEL, "%s", kobject_name(&dev->kobj)); | |
702 | rename: | |
703 | if (!device->name) { | |
797a8b4d RM |
704 | ret = -ENOMEM; |
705 | goto err_remove_link; | |
d72e31c9 | 706 | } |
1460432c | 707 | |
d72e31c9 AW |
708 | ret = sysfs_create_link_nowarn(group->devices_kobj, |
709 | &dev->kobj, device->name); | |
710 | if (ret) { | |
d72e31c9 AW |
711 | if (ret == -EEXIST && i >= 0) { |
712 | /* | |
713 | * Account for the slim chance of collision | |
714 | * and append an instance to the name. | |
715 | */ | |
797a8b4d | 716 | kfree(device->name); |
d72e31c9 AW |
717 | device->name = kasprintf(GFP_KERNEL, "%s.%d", |
718 | kobject_name(&dev->kobj), i++); | |
719 | goto rename; | |
720 | } | |
797a8b4d | 721 | goto err_free_name; |
d72e31c9 AW |
722 | } |
723 | ||
724 | kobject_get(group->devices_kobj); | |
725 | ||
726 | dev->iommu_group = group; | |
727 | ||
beed2821 JR |
728 | iommu_group_create_direct_mappings(group, dev); |
729 | ||
d72e31c9 AW |
730 | mutex_lock(&group->mutex); |
731 | list_add_tail(&device->list, &group->devices); | |
e39cb8a3 | 732 | if (group->domain) |
797a8b4d | 733 | ret = __iommu_attach_device(group->domain, dev); |
d72e31c9 | 734 | mutex_unlock(&group->mutex); |
797a8b4d RM |
735 | if (ret) |
736 | goto err_put_group; | |
d72e31c9 AW |
737 | |
738 | /* Notify any listeners about change to group. */ | |
739 | blocking_notifier_call_chain(&group->notifier, | |
740 | IOMMU_GROUP_NOTIFY_ADD_DEVICE, dev); | |
d1cf7e82 SK |
741 | |
742 | trace_add_device_to_group(group->id, dev); | |
269aa808 | 743 | |
780da9e4 | 744 | dev_info(dev, "Adding to iommu group %d\n", group->id); |
269aa808 | 745 | |
1460432c | 746 | return 0; |
797a8b4d RM |
747 | |
748 | err_put_group: | |
749 | mutex_lock(&group->mutex); | |
750 | list_del(&device->list); | |
751 | mutex_unlock(&group->mutex); | |
752 | dev->iommu_group = NULL; | |
753 | kobject_put(group->devices_kobj); | |
0e928c95 | 754 | sysfs_remove_link(group->devices_kobj, device->name); |
797a8b4d RM |
755 | err_free_name: |
756 | kfree(device->name); | |
757 | err_remove_link: | |
758 | sysfs_remove_link(&dev->kobj, "iommu_group"); | |
759 | err_free_device: | |
760 | kfree(device); | |
780da9e4 | 761 | dev_err(dev, "Failed to add to iommu group %d: %d\n", group->id, ret); |
797a8b4d | 762 | return ret; |
1460432c | 763 | } |
d72e31c9 | 764 | EXPORT_SYMBOL_GPL(iommu_group_add_device); |
1460432c | 765 | |
d72e31c9 AW |
766 | /** |
767 | * iommu_group_remove_device - remove a device from it's current group | |
768 | * @dev: device to be removed | |
769 | * | |
770 | * This function is called by an iommu driver to remove the device from | |
771 | * it's current group. This decrements the iommu group reference count. | |
772 | */ | |
773 | void iommu_group_remove_device(struct device *dev) | |
774 | { | |
775 | struct iommu_group *group = dev->iommu_group; | |
c09e22d5 | 776 | struct group_device *tmp_device, *device = NULL; |
d72e31c9 | 777 | |
f0c64176 FW |
778 | if (!group) |
779 | return; | |
780 | ||
780da9e4 | 781 | dev_info(dev, "Removing from iommu group %d\n", group->id); |
269aa808 | 782 | |
d72e31c9 AW |
783 | /* Pre-notify listeners that a device is being removed. */ |
784 | blocking_notifier_call_chain(&group->notifier, | |
785 | IOMMU_GROUP_NOTIFY_DEL_DEVICE, dev); | |
786 | ||
787 | mutex_lock(&group->mutex); | |
788 | list_for_each_entry(tmp_device, &group->devices, list) { | |
789 | if (tmp_device->dev == dev) { | |
790 | device = tmp_device; | |
791 | list_del(&device->list); | |
792 | break; | |
793 | } | |
794 | } | |
795 | mutex_unlock(&group->mutex); | |
796 | ||
797 | if (!device) | |
798 | return; | |
799 | ||
800 | sysfs_remove_link(group->devices_kobj, device->name); | |
801 | sysfs_remove_link(&dev->kobj, "iommu_group"); | |
802 | ||
2e757086 SK |
803 | trace_remove_device_from_group(group->id, dev); |
804 | ||
d72e31c9 AW |
805 | kfree(device->name); |
806 | kfree(device); | |
807 | dev->iommu_group = NULL; | |
808 | kobject_put(group->devices_kobj); | |
809 | } | |
810 | EXPORT_SYMBOL_GPL(iommu_group_remove_device); | |
811 | ||
426a2738 JR |
812 | static int iommu_group_device_count(struct iommu_group *group) |
813 | { | |
c09e22d5 | 814 | struct group_device *entry; |
426a2738 JR |
815 | int ret = 0; |
816 | ||
817 | list_for_each_entry(entry, &group->devices, list) | |
818 | ret++; | |
819 | ||
820 | return ret; | |
821 | } | |
822 | ||
d72e31c9 AW |
823 | /** |
824 | * iommu_group_for_each_dev - iterate over each device in the group | |
825 | * @group: the group | |
826 | * @data: caller opaque data to be passed to callback function | |
827 | * @fn: caller supplied callback function | |
828 | * | |
829 | * This function is called by group users to iterate over group devices. | |
830 | * Callers should hold a reference count to the group during callback. | |
831 | * The group->mutex is held across callbacks, which will block calls to | |
832 | * iommu_group_add/remove_device. | |
833 | */ | |
e39cb8a3 JR |
834 | static int __iommu_group_for_each_dev(struct iommu_group *group, void *data, |
835 | int (*fn)(struct device *, void *)) | |
d72e31c9 | 836 | { |
c09e22d5 | 837 | struct group_device *device; |
d72e31c9 AW |
838 | int ret = 0; |
839 | ||
d72e31c9 AW |
840 | list_for_each_entry(device, &group->devices, list) { |
841 | ret = fn(device->dev, data); | |
842 | if (ret) | |
843 | break; | |
844 | } | |
e39cb8a3 JR |
845 | return ret; |
846 | } | |
847 | ||
848 | ||
849 | int iommu_group_for_each_dev(struct iommu_group *group, void *data, | |
850 | int (*fn)(struct device *, void *)) | |
851 | { | |
852 | int ret; | |
853 | ||
854 | mutex_lock(&group->mutex); | |
855 | ret = __iommu_group_for_each_dev(group, data, fn); | |
d72e31c9 | 856 | mutex_unlock(&group->mutex); |
e39cb8a3 | 857 | |
d72e31c9 AW |
858 | return ret; |
859 | } | |
860 | EXPORT_SYMBOL_GPL(iommu_group_for_each_dev); | |
861 | ||
862 | /** | |
863 | * iommu_group_get - Return the group for a device and increment reference | |
864 | * @dev: get the group that this device belongs to | |
865 | * | |
866 | * This function is called by iommu drivers and users to get the group | |
867 | * for the specified device. If found, the group is returned and the group | |
868 | * reference in incremented, else NULL. | |
869 | */ | |
870 | struct iommu_group *iommu_group_get(struct device *dev) | |
871 | { | |
872 | struct iommu_group *group = dev->iommu_group; | |
873 | ||
874 | if (group) | |
875 | kobject_get(group->devices_kobj); | |
876 | ||
877 | return group; | |
878 | } | |
879 | EXPORT_SYMBOL_GPL(iommu_group_get); | |
880 | ||
13f59a78 RM |
881 | /** |
882 | * iommu_group_ref_get - Increment reference on a group | |
883 | * @group: the group to use, must not be NULL | |
884 | * | |
885 | * This function is called by iommu drivers to take additional references on an | |
886 | * existing group. Returns the given group for convenience. | |
887 | */ | |
888 | struct iommu_group *iommu_group_ref_get(struct iommu_group *group) | |
889 | { | |
890 | kobject_get(group->devices_kobj); | |
891 | return group; | |
892 | } | |
893 | ||
d72e31c9 AW |
894 | /** |
895 | * iommu_group_put - Decrement group reference | |
896 | * @group: the group to use | |
897 | * | |
898 | * This function is called by iommu drivers and users to release the | |
899 | * iommu group. Once the reference count is zero, the group is released. | |
900 | */ | |
901 | void iommu_group_put(struct iommu_group *group) | |
902 | { | |
903 | if (group) | |
904 | kobject_put(group->devices_kobj); | |
905 | } | |
906 | EXPORT_SYMBOL_GPL(iommu_group_put); | |
907 | ||
908 | /** | |
909 | * iommu_group_register_notifier - Register a notifier for group changes | |
910 | * @group: the group to watch | |
911 | * @nb: notifier block to signal | |
912 | * | |
913 | * This function allows iommu group users to track changes in a group. | |
914 | * See include/linux/iommu.h for actions sent via this notifier. Caller | |
915 | * should hold a reference to the group throughout notifier registration. | |
916 | */ | |
917 | int iommu_group_register_notifier(struct iommu_group *group, | |
918 | struct notifier_block *nb) | |
919 | { | |
920 | return blocking_notifier_chain_register(&group->notifier, nb); | |
921 | } | |
922 | EXPORT_SYMBOL_GPL(iommu_group_register_notifier); | |
923 | ||
924 | /** | |
925 | * iommu_group_unregister_notifier - Unregister a notifier | |
926 | * @group: the group to watch | |
927 | * @nb: notifier block to signal | |
928 | * | |
929 | * Unregister a previously registered group notifier block. | |
930 | */ | |
931 | int iommu_group_unregister_notifier(struct iommu_group *group, | |
932 | struct notifier_block *nb) | |
933 | { | |
934 | return blocking_notifier_chain_unregister(&group->notifier, nb); | |
935 | } | |
936 | EXPORT_SYMBOL_GPL(iommu_group_unregister_notifier); | |
937 | ||
0c830e6b JP |
938 | /** |
939 | * iommu_register_device_fault_handler() - Register a device fault handler | |
940 | * @dev: the device | |
941 | * @handler: the fault handler | |
942 | * @data: private data passed as argument to the handler | |
943 | * | |
944 | * When an IOMMU fault event is received, this handler gets called with the | |
bf3255b3 JPB |
945 | * fault event and data as argument. The handler should return 0 on success. If |
946 | * the fault is recoverable (IOMMU_FAULT_PAGE_REQ), the consumer should also | |
947 | * complete the fault by calling iommu_page_response() with one of the following | |
948 | * response code: | |
949 | * - IOMMU_PAGE_RESP_SUCCESS: retry the translation | |
950 | * - IOMMU_PAGE_RESP_INVALID: terminate the fault | |
951 | * - IOMMU_PAGE_RESP_FAILURE: terminate the fault and stop reporting | |
952 | * page faults if possible. | |
0c830e6b JP |
953 | * |
954 | * Return 0 if the fault handler was installed successfully, or an error. | |
955 | */ | |
956 | int iommu_register_device_fault_handler(struct device *dev, | |
957 | iommu_dev_fault_handler_t handler, | |
958 | void *data) | |
959 | { | |
960 | struct iommu_param *param = dev->iommu_param; | |
961 | int ret = 0; | |
962 | ||
963 | if (!param) | |
964 | return -EINVAL; | |
965 | ||
966 | mutex_lock(¶m->lock); | |
967 | /* Only allow one fault handler registered for each device */ | |
968 | if (param->fault_param) { | |
969 | ret = -EBUSY; | |
970 | goto done_unlock; | |
971 | } | |
972 | ||
973 | get_device(dev); | |
974 | param->fault_param = kzalloc(sizeof(*param->fault_param), GFP_KERNEL); | |
975 | if (!param->fault_param) { | |
976 | put_device(dev); | |
977 | ret = -ENOMEM; | |
978 | goto done_unlock; | |
979 | } | |
980 | param->fault_param->handler = handler; | |
981 | param->fault_param->data = data; | |
bf3255b3 JPB |
982 | mutex_init(¶m->fault_param->lock); |
983 | INIT_LIST_HEAD(¶m->fault_param->faults); | |
0c830e6b JP |
984 | |
985 | done_unlock: | |
986 | mutex_unlock(¶m->lock); | |
987 | ||
988 | return ret; | |
989 | } | |
990 | EXPORT_SYMBOL_GPL(iommu_register_device_fault_handler); | |
991 | ||
992 | /** | |
993 | * iommu_unregister_device_fault_handler() - Unregister the device fault handler | |
994 | * @dev: the device | |
995 | * | |
996 | * Remove the device fault handler installed with | |
997 | * iommu_register_device_fault_handler(). | |
998 | * | |
999 | * Return 0 on success, or an error. | |
1000 | */ | |
1001 | int iommu_unregister_device_fault_handler(struct device *dev) | |
1002 | { | |
1003 | struct iommu_param *param = dev->iommu_param; | |
1004 | int ret = 0; | |
1005 | ||
1006 | if (!param) | |
1007 | return -EINVAL; | |
1008 | ||
1009 | mutex_lock(¶m->lock); | |
1010 | ||
1011 | if (!param->fault_param) | |
1012 | goto unlock; | |
1013 | ||
bf3255b3 JPB |
1014 | /* we cannot unregister handler if there are pending faults */ |
1015 | if (!list_empty(¶m->fault_param->faults)) { | |
1016 | ret = -EBUSY; | |
1017 | goto unlock; | |
1018 | } | |
1019 | ||
0c830e6b JP |
1020 | kfree(param->fault_param); |
1021 | param->fault_param = NULL; | |
1022 | put_device(dev); | |
1023 | unlock: | |
1024 | mutex_unlock(¶m->lock); | |
1025 | ||
1026 | return ret; | |
1027 | } | |
1028 | EXPORT_SYMBOL_GPL(iommu_unregister_device_fault_handler); | |
1029 | ||
1030 | /** | |
1031 | * iommu_report_device_fault() - Report fault event to device driver | |
1032 | * @dev: the device | |
1033 | * @evt: fault event data | |
1034 | * | |
1035 | * Called by IOMMU drivers when a fault is detected, typically in a threaded IRQ | |
bf3255b3 JPB |
1036 | * handler. When this function fails and the fault is recoverable, it is the |
1037 | * caller's responsibility to complete the fault. | |
0c830e6b JP |
1038 | * |
1039 | * Return 0 on success, or an error. | |
1040 | */ | |
1041 | int iommu_report_device_fault(struct device *dev, struct iommu_fault_event *evt) | |
1042 | { | |
1043 | struct iommu_param *param = dev->iommu_param; | |
bf3255b3 | 1044 | struct iommu_fault_event *evt_pending = NULL; |
0c830e6b JP |
1045 | struct iommu_fault_param *fparam; |
1046 | int ret = 0; | |
1047 | ||
1048 | if (!param || !evt) | |
1049 | return -EINVAL; | |
1050 | ||
1051 | /* we only report device fault if there is a handler registered */ | |
1052 | mutex_lock(¶m->lock); | |
1053 | fparam = param->fault_param; | |
1054 | if (!fparam || !fparam->handler) { | |
1055 | ret = -EINVAL; | |
1056 | goto done_unlock; | |
1057 | } | |
bf3255b3 JPB |
1058 | |
1059 | if (evt->fault.type == IOMMU_FAULT_PAGE_REQ && | |
1060 | (evt->fault.prm.flags & IOMMU_FAULT_PAGE_REQUEST_LAST_PAGE)) { | |
1061 | evt_pending = kmemdup(evt, sizeof(struct iommu_fault_event), | |
1062 | GFP_KERNEL); | |
1063 | if (!evt_pending) { | |
1064 | ret = -ENOMEM; | |
1065 | goto done_unlock; | |
1066 | } | |
1067 | mutex_lock(&fparam->lock); | |
1068 | list_add_tail(&evt_pending->list, &fparam->faults); | |
1069 | mutex_unlock(&fparam->lock); | |
1070 | } | |
1071 | ||
0c830e6b | 1072 | ret = fparam->handler(&evt->fault, fparam->data); |
bf3255b3 JPB |
1073 | if (ret && evt_pending) { |
1074 | mutex_lock(&fparam->lock); | |
1075 | list_del(&evt_pending->list); | |
1076 | mutex_unlock(&fparam->lock); | |
1077 | kfree(evt_pending); | |
1078 | } | |
0c830e6b JP |
1079 | done_unlock: |
1080 | mutex_unlock(¶m->lock); | |
1081 | return ret; | |
1082 | } | |
1083 | EXPORT_SYMBOL_GPL(iommu_report_device_fault); | |
1084 | ||
bf3255b3 JPB |
1085 | int iommu_page_response(struct device *dev, |
1086 | struct iommu_page_response *msg) | |
1087 | { | |
1088 | bool pasid_valid; | |
1089 | int ret = -EINVAL; | |
1090 | struct iommu_fault_event *evt; | |
1091 | struct iommu_fault_page_request *prm; | |
1092 | struct iommu_param *param = dev->iommu_param; | |
1093 | struct iommu_domain *domain = iommu_get_domain_for_dev(dev); | |
1094 | ||
1095 | if (!domain || !domain->ops->page_response) | |
1096 | return -ENODEV; | |
1097 | ||
1098 | if (!param || !param->fault_param) | |
1099 | return -EINVAL; | |
1100 | ||
1101 | if (msg->version != IOMMU_PAGE_RESP_VERSION_1 || | |
1102 | msg->flags & ~IOMMU_PAGE_RESP_PASID_VALID) | |
1103 | return -EINVAL; | |
1104 | ||
1105 | /* Only send response if there is a fault report pending */ | |
1106 | mutex_lock(¶m->fault_param->lock); | |
1107 | if (list_empty(¶m->fault_param->faults)) { | |
1108 | dev_warn_ratelimited(dev, "no pending PRQ, drop response\n"); | |
1109 | goto done_unlock; | |
1110 | } | |
1111 | /* | |
1112 | * Check if we have a matching page request pending to respond, | |
1113 | * otherwise return -EINVAL | |
1114 | */ | |
1115 | list_for_each_entry(evt, ¶m->fault_param->faults, list) { | |
1116 | prm = &evt->fault.prm; | |
1117 | pasid_valid = prm->flags & IOMMU_FAULT_PAGE_REQUEST_PASID_VALID; | |
1118 | ||
1119 | if ((pasid_valid && prm->pasid != msg->pasid) || | |
1120 | prm->grpid != msg->grpid) | |
1121 | continue; | |
1122 | ||
1123 | /* Sanitize the reply */ | |
1124 | msg->flags = pasid_valid ? IOMMU_PAGE_RESP_PASID_VALID : 0; | |
1125 | ||
1126 | ret = domain->ops->page_response(dev, evt, msg); | |
1127 | list_del(&evt->list); | |
1128 | kfree(evt); | |
1129 | break; | |
1130 | } | |
1131 | ||
1132 | done_unlock: | |
1133 | mutex_unlock(¶m->fault_param->lock); | |
1134 | return ret; | |
1135 | } | |
1136 | EXPORT_SYMBOL_GPL(iommu_page_response); | |
1137 | ||
d72e31c9 AW |
1138 | /** |
1139 | * iommu_group_id - Return ID for a group | |
1140 | * @group: the group to ID | |
1141 | * | |
1142 | * Return the unique ID for the group matching the sysfs group number. | |
1143 | */ | |
1144 | int iommu_group_id(struct iommu_group *group) | |
1145 | { | |
1146 | return group->id; | |
1147 | } | |
1148 | EXPORT_SYMBOL_GPL(iommu_group_id); | |
1460432c | 1149 | |
f096c061 AW |
1150 | static struct iommu_group *get_pci_alias_group(struct pci_dev *pdev, |
1151 | unsigned long *devfns); | |
1152 | ||
104a1c13 AW |
1153 | /* |
1154 | * To consider a PCI device isolated, we require ACS to support Source | |
1155 | * Validation, Request Redirection, Completer Redirection, and Upstream | |
1156 | * Forwarding. This effectively means that devices cannot spoof their | |
1157 | * requester ID, requests and completions cannot be redirected, and all | |
1158 | * transactions are forwarded upstream, even as it passes through a | |
1159 | * bridge where the target device is downstream. | |
1160 | */ | |
1161 | #define REQ_ACS_FLAGS (PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF) | |
1162 | ||
f096c061 AW |
1163 | /* |
1164 | * For multifunction devices which are not isolated from each other, find | |
1165 | * all the other non-isolated functions and look for existing groups. For | |
1166 | * each function, we also need to look for aliases to or from other devices | |
1167 | * that may already have a group. | |
1168 | */ | |
1169 | static struct iommu_group *get_pci_function_alias_group(struct pci_dev *pdev, | |
1170 | unsigned long *devfns) | |
1171 | { | |
1172 | struct pci_dev *tmp = NULL; | |
1173 | struct iommu_group *group; | |
1174 | ||
1175 | if (!pdev->multifunction || pci_acs_enabled(pdev, REQ_ACS_FLAGS)) | |
1176 | return NULL; | |
1177 | ||
1178 | for_each_pci_dev(tmp) { | |
1179 | if (tmp == pdev || tmp->bus != pdev->bus || | |
1180 | PCI_SLOT(tmp->devfn) != PCI_SLOT(pdev->devfn) || | |
1181 | pci_acs_enabled(tmp, REQ_ACS_FLAGS)) | |
1182 | continue; | |
1183 | ||
1184 | group = get_pci_alias_group(tmp, devfns); | |
1185 | if (group) { | |
1186 | pci_dev_put(tmp); | |
1187 | return group; | |
1188 | } | |
1189 | } | |
1190 | ||
1191 | return NULL; | |
1192 | } | |
1193 | ||
1194 | /* | |
338c3149 JL |
1195 | * Look for aliases to or from the given device for existing groups. DMA |
1196 | * aliases are only supported on the same bus, therefore the search | |
f096c061 AW |
1197 | * space is quite small (especially since we're really only looking at pcie |
1198 | * device, and therefore only expect multiple slots on the root complex or | |
1199 | * downstream switch ports). It's conceivable though that a pair of | |
1200 | * multifunction devices could have aliases between them that would cause a | |
1201 | * loop. To prevent this, we use a bitmap to track where we've been. | |
1202 | */ | |
1203 | static struct iommu_group *get_pci_alias_group(struct pci_dev *pdev, | |
1204 | unsigned long *devfns) | |
1205 | { | |
1206 | struct pci_dev *tmp = NULL; | |
1207 | struct iommu_group *group; | |
1208 | ||
1209 | if (test_and_set_bit(pdev->devfn & 0xff, devfns)) | |
1210 | return NULL; | |
1211 | ||
1212 | group = iommu_group_get(&pdev->dev); | |
1213 | if (group) | |
1214 | return group; | |
1215 | ||
1216 | for_each_pci_dev(tmp) { | |
1217 | if (tmp == pdev || tmp->bus != pdev->bus) | |
1218 | continue; | |
1219 | ||
1220 | /* We alias them or they alias us */ | |
338c3149 | 1221 | if (pci_devs_are_dma_aliases(pdev, tmp)) { |
f096c061 AW |
1222 | group = get_pci_alias_group(tmp, devfns); |
1223 | if (group) { | |
1224 | pci_dev_put(tmp); | |
1225 | return group; | |
1226 | } | |
1227 | ||
1228 | group = get_pci_function_alias_group(tmp, devfns); | |
1229 | if (group) { | |
1230 | pci_dev_put(tmp); | |
1231 | return group; | |
1232 | } | |
1233 | } | |
1234 | } | |
1235 | ||
1236 | return NULL; | |
1237 | } | |
1238 | ||
104a1c13 AW |
1239 | struct group_for_pci_data { |
1240 | struct pci_dev *pdev; | |
1241 | struct iommu_group *group; | |
1242 | }; | |
1243 | ||
1244 | /* | |
1245 | * DMA alias iterator callback, return the last seen device. Stop and return | |
1246 | * the IOMMU group if we find one along the way. | |
1247 | */ | |
1248 | static int get_pci_alias_or_group(struct pci_dev *pdev, u16 alias, void *opaque) | |
1249 | { | |
1250 | struct group_for_pci_data *data = opaque; | |
1251 | ||
1252 | data->pdev = pdev; | |
1253 | data->group = iommu_group_get(&pdev->dev); | |
1254 | ||
1255 | return data->group != NULL; | |
1256 | } | |
1257 | ||
6eab556a JR |
1258 | /* |
1259 | * Generic device_group call-back function. It just allocates one | |
1260 | * iommu-group per device. | |
1261 | */ | |
1262 | struct iommu_group *generic_device_group(struct device *dev) | |
1263 | { | |
7f7a2304 | 1264 | return iommu_group_alloc(); |
6eab556a JR |
1265 | } |
1266 | ||
104a1c13 AW |
1267 | /* |
1268 | * Use standard PCI bus topology, isolation features, and DMA alias quirks | |
1269 | * to find or create an IOMMU group for a device. | |
1270 | */ | |
5e62292b | 1271 | struct iommu_group *pci_device_group(struct device *dev) |
104a1c13 | 1272 | { |
5e62292b | 1273 | struct pci_dev *pdev = to_pci_dev(dev); |
104a1c13 AW |
1274 | struct group_for_pci_data data; |
1275 | struct pci_bus *bus; | |
1276 | struct iommu_group *group = NULL; | |
f096c061 | 1277 | u64 devfns[4] = { 0 }; |
104a1c13 | 1278 | |
5e62292b JR |
1279 | if (WARN_ON(!dev_is_pci(dev))) |
1280 | return ERR_PTR(-EINVAL); | |
1281 | ||
104a1c13 AW |
1282 | /* |
1283 | * Find the upstream DMA alias for the device. A device must not | |
1284 | * be aliased due to topology in order to have its own IOMMU group. | |
1285 | * If we find an alias along the way that already belongs to a | |
1286 | * group, use it. | |
1287 | */ | |
1288 | if (pci_for_each_dma_alias(pdev, get_pci_alias_or_group, &data)) | |
1289 | return data.group; | |
1290 | ||
1291 | pdev = data.pdev; | |
1292 | ||
1293 | /* | |
1294 | * Continue upstream from the point of minimum IOMMU granularity | |
1295 | * due to aliases to the point where devices are protected from | |
1296 | * peer-to-peer DMA by PCI ACS. Again, if we find an existing | |
1297 | * group, use it. | |
1298 | */ | |
1299 | for (bus = pdev->bus; !pci_is_root_bus(bus); bus = bus->parent) { | |
1300 | if (!bus->self) | |
1301 | continue; | |
1302 | ||
1303 | if (pci_acs_path_enabled(bus->self, NULL, REQ_ACS_FLAGS)) | |
1304 | break; | |
1305 | ||
1306 | pdev = bus->self; | |
1307 | ||
1308 | group = iommu_group_get(&pdev->dev); | |
1309 | if (group) | |
1310 | return group; | |
1311 | } | |
1312 | ||
1313 | /* | |
f096c061 AW |
1314 | * Look for existing groups on device aliases. If we alias another |
1315 | * device or another device aliases us, use the same group. | |
104a1c13 | 1316 | */ |
f096c061 AW |
1317 | group = get_pci_alias_group(pdev, (unsigned long *)devfns); |
1318 | if (group) | |
1319 | return group; | |
104a1c13 AW |
1320 | |
1321 | /* | |
f096c061 AW |
1322 | * Look for existing groups on non-isolated functions on the same |
1323 | * slot and aliases of those funcions, if any. No need to clear | |
1324 | * the search bitmap, the tested devfns are still valid. | |
104a1c13 | 1325 | */ |
f096c061 AW |
1326 | group = get_pci_function_alias_group(pdev, (unsigned long *)devfns); |
1327 | if (group) | |
1328 | return group; | |
104a1c13 AW |
1329 | |
1330 | /* No shared group found, allocate new */ | |
7f7a2304 | 1331 | return iommu_group_alloc(); |
104a1c13 AW |
1332 | } |
1333 | ||
eab03e2a NG |
1334 | /* Get the IOMMU group for device on fsl-mc bus */ |
1335 | struct iommu_group *fsl_mc_device_group(struct device *dev) | |
1336 | { | |
1337 | struct device *cont_dev = fsl_mc_cont_dev(dev); | |
1338 | struct iommu_group *group; | |
1339 | ||
1340 | group = iommu_group_get(cont_dev); | |
1341 | if (!group) | |
1342 | group = iommu_group_alloc(); | |
1343 | return group; | |
1344 | } | |
1345 | ||
104a1c13 AW |
1346 | /** |
1347 | * iommu_group_get_for_dev - Find or create the IOMMU group for a device | |
1348 | * @dev: target device | |
1349 | * | |
1350 | * This function is intended to be called by IOMMU drivers and extended to | |
1351 | * support common, bus-defined algorithms when determining or creating the | |
1352 | * IOMMU group for a device. On success, the caller will hold a reference | |
1353 | * to the returned IOMMU group, which will already include the provided | |
1354 | * device. The reference should be released with iommu_group_put(). | |
1355 | */ | |
1356 | struct iommu_group *iommu_group_get_for_dev(struct device *dev) | |
1357 | { | |
46c6b2bc | 1358 | const struct iommu_ops *ops = dev->bus->iommu_ops; |
c4a783b8 | 1359 | struct iommu_group *group; |
104a1c13 AW |
1360 | int ret; |
1361 | ||
1362 | group = iommu_group_get(dev); | |
1363 | if (group) | |
1364 | return group; | |
1365 | ||
05f80300 RM |
1366 | if (!ops) |
1367 | return ERR_PTR(-EINVAL); | |
104a1c13 | 1368 | |
05f80300 | 1369 | group = ops->device_group(dev); |
72dcac63 JR |
1370 | if (WARN_ON_ONCE(group == NULL)) |
1371 | return ERR_PTR(-EINVAL); | |
1372 | ||
104a1c13 AW |
1373 | if (IS_ERR(group)) |
1374 | return group; | |
1375 | ||
1228236d JR |
1376 | /* |
1377 | * Try to allocate a default domain - needs support from the | |
1378 | * IOMMU driver. | |
1379 | */ | |
1380 | if (!group->default_domain) { | |
fccb4e3b WD |
1381 | struct iommu_domain *dom; |
1382 | ||
1383 | dom = __iommu_domain_alloc(dev->bus, iommu_def_domain_type); | |
1384 | if (!dom && iommu_def_domain_type != IOMMU_DOMAIN_DMA) { | |
fccb4e3b | 1385 | dom = __iommu_domain_alloc(dev->bus, IOMMU_DOMAIN_DMA); |
8bc32a28 JR |
1386 | if (dom) { |
1387 | dev_warn(dev, | |
1388 | "failed to allocate default IOMMU domain of type %u; falling back to IOMMU_DOMAIN_DMA", | |
1389 | iommu_def_domain_type); | |
1390 | } | |
fccb4e3b WD |
1391 | } |
1392 | ||
1393 | group->default_domain = dom; | |
eebb8034 | 1394 | if (!group->domain) |
fccb4e3b | 1395 | group->domain = dom; |
68a6efe8 ZL |
1396 | |
1397 | if (dom && !iommu_dma_strict) { | |
1398 | int attr = 1; | |
1399 | iommu_domain_set_attr(dom, | |
1400 | DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE, | |
1401 | &attr); | |
1402 | } | |
1228236d JR |
1403 | } |
1404 | ||
104a1c13 AW |
1405 | ret = iommu_group_add_device(group, dev); |
1406 | if (ret) { | |
1407 | iommu_group_put(group); | |
1408 | return ERR_PTR(ret); | |
1409 | } | |
1410 | ||
1411 | return group; | |
1412 | } | |
1413 | ||
6827ca83 JR |
1414 | struct iommu_domain *iommu_group_default_domain(struct iommu_group *group) |
1415 | { | |
1416 | return group->default_domain; | |
1417 | } | |
1418 | ||
d72e31c9 | 1419 | static int add_iommu_group(struct device *dev, void *data) |
1460432c | 1420 | { |
cc5aed44 | 1421 | int ret = iommu_probe_device(dev); |
38667f18 JR |
1422 | |
1423 | /* | |
1424 | * We ignore -ENODEV errors for now, as they just mean that the | |
1425 | * device is not translated by an IOMMU. We still care about | |
1426 | * other errors and fail to initialize when they happen. | |
1427 | */ | |
1428 | if (ret == -ENODEV) | |
1429 | ret = 0; | |
1430 | ||
1431 | return ret; | |
1460432c AW |
1432 | } |
1433 | ||
8da30142 JR |
1434 | static int remove_iommu_group(struct device *dev, void *data) |
1435 | { | |
cc5aed44 | 1436 | iommu_release_device(dev); |
1460432c AW |
1437 | |
1438 | return 0; | |
1439 | } | |
1440 | ||
d72e31c9 AW |
1441 | static int iommu_bus_notifier(struct notifier_block *nb, |
1442 | unsigned long action, void *data) | |
1460432c | 1443 | { |
cc5aed44 | 1444 | unsigned long group_action = 0; |
1460432c | 1445 | struct device *dev = data; |
d72e31c9 | 1446 | struct iommu_group *group; |
d72e31c9 AW |
1447 | |
1448 | /* | |
1449 | * ADD/DEL call into iommu driver ops if provided, which may | |
1450 | * result in ADD/DEL notifiers to group->notifier | |
1451 | */ | |
1452 | if (action == BUS_NOTIFY_ADD_DEVICE) { | |
cc5aed44 | 1453 | int ret; |
3ba8775f | 1454 | |
cc5aed44 JR |
1455 | ret = iommu_probe_device(dev); |
1456 | return (ret) ? NOTIFY_DONE : NOTIFY_OK; | |
843cb6dc | 1457 | } else if (action == BUS_NOTIFY_REMOVED_DEVICE) { |
cc5aed44 JR |
1458 | iommu_release_device(dev); |
1459 | return NOTIFY_OK; | |
d72e31c9 | 1460 | } |
1460432c | 1461 | |
d72e31c9 AW |
1462 | /* |
1463 | * Remaining BUS_NOTIFYs get filtered and republished to the | |
1464 | * group, if anyone is listening | |
1465 | */ | |
1466 | group = iommu_group_get(dev); | |
1467 | if (!group) | |
1468 | return 0; | |
1460432c | 1469 | |
d72e31c9 AW |
1470 | switch (action) { |
1471 | case BUS_NOTIFY_BIND_DRIVER: | |
1472 | group_action = IOMMU_GROUP_NOTIFY_BIND_DRIVER; | |
1473 | break; | |
1474 | case BUS_NOTIFY_BOUND_DRIVER: | |
1475 | group_action = IOMMU_GROUP_NOTIFY_BOUND_DRIVER; | |
1476 | break; | |
1477 | case BUS_NOTIFY_UNBIND_DRIVER: | |
1478 | group_action = IOMMU_GROUP_NOTIFY_UNBIND_DRIVER; | |
1479 | break; | |
1480 | case BUS_NOTIFY_UNBOUND_DRIVER: | |
1481 | group_action = IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER; | |
1482 | break; | |
1483 | } | |
1460432c | 1484 | |
d72e31c9 AW |
1485 | if (group_action) |
1486 | blocking_notifier_call_chain(&group->notifier, | |
1487 | group_action, dev); | |
1460432c | 1488 | |
d72e31c9 | 1489 | iommu_group_put(group); |
1460432c AW |
1490 | return 0; |
1491 | } | |
1492 | ||
fb3e3065 | 1493 | static int iommu_bus_init(struct bus_type *bus, const struct iommu_ops *ops) |
ff21776d | 1494 | { |
fb3e3065 MS |
1495 | int err; |
1496 | struct notifier_block *nb; | |
b22f6434 | 1497 | |
fb3e3065 MS |
1498 | nb = kzalloc(sizeof(struct notifier_block), GFP_KERNEL); |
1499 | if (!nb) | |
1500 | return -ENOMEM; | |
1501 | ||
1502 | nb->notifier_call = iommu_bus_notifier; | |
1503 | ||
1504 | err = bus_register_notifier(bus, nb); | |
8da30142 JR |
1505 | if (err) |
1506 | goto out_free; | |
d7da6bdc | 1507 | |
8cec63e5 | 1508 | err = bus_for_each_dev(bus, NULL, NULL, add_iommu_group); |
8da30142 JR |
1509 | if (err) |
1510 | goto out_err; | |
1511 | ||
d7da6bdc HS |
1512 | |
1513 | return 0; | |
8da30142 JR |
1514 | |
1515 | out_err: | |
1516 | /* Clean up */ | |
8cec63e5 | 1517 | bus_for_each_dev(bus, NULL, NULL, remove_iommu_group); |
8da30142 JR |
1518 | bus_unregister_notifier(bus, nb); |
1519 | ||
1520 | out_free: | |
1521 | kfree(nb); | |
1522 | ||
1523 | return err; | |
ff21776d | 1524 | } |
fc2100eb | 1525 | |
ff21776d JR |
1526 | /** |
1527 | * bus_set_iommu - set iommu-callbacks for the bus | |
1528 | * @bus: bus. | |
1529 | * @ops: the callbacks provided by the iommu-driver | |
1530 | * | |
1531 | * This function is called by an iommu driver to set the iommu methods | |
1532 | * used for a particular bus. Drivers for devices on that bus can use | |
1533 | * the iommu-api after these ops are registered. | |
1534 | * This special function is needed because IOMMUs are usually devices on | |
1535 | * the bus itself, so the iommu drivers are not initialized when the bus | |
1536 | * is set up. With this function the iommu-driver can set the iommu-ops | |
1537 | * afterwards. | |
1538 | */ | |
b22f6434 | 1539 | int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops) |
fc2100eb | 1540 | { |
d7da6bdc HS |
1541 | int err; |
1542 | ||
ff21776d JR |
1543 | if (bus->iommu_ops != NULL) |
1544 | return -EBUSY; | |
fc2100eb | 1545 | |
ff21776d JR |
1546 | bus->iommu_ops = ops; |
1547 | ||
1548 | /* Do IOMMU specific setup for this bus-type */ | |
d7da6bdc HS |
1549 | err = iommu_bus_init(bus, ops); |
1550 | if (err) | |
1551 | bus->iommu_ops = NULL; | |
1552 | ||
1553 | return err; | |
fc2100eb | 1554 | } |
ff21776d | 1555 | EXPORT_SYMBOL_GPL(bus_set_iommu); |
fc2100eb | 1556 | |
a1b60c1c | 1557 | bool iommu_present(struct bus_type *bus) |
fc2100eb | 1558 | { |
94441c3b | 1559 | return bus->iommu_ops != NULL; |
fc2100eb | 1560 | } |
a1b60c1c | 1561 | EXPORT_SYMBOL_GPL(iommu_present); |
fc2100eb | 1562 | |
3c0e0ca0 JR |
1563 | bool iommu_capable(struct bus_type *bus, enum iommu_cap cap) |
1564 | { | |
1565 | if (!bus->iommu_ops || !bus->iommu_ops->capable) | |
1566 | return false; | |
1567 | ||
1568 | return bus->iommu_ops->capable(cap); | |
1569 | } | |
1570 | EXPORT_SYMBOL_GPL(iommu_capable); | |
1571 | ||
4f3f8d9d OBC |
1572 | /** |
1573 | * iommu_set_fault_handler() - set a fault handler for an iommu domain | |
1574 | * @domain: iommu domain | |
1575 | * @handler: fault handler | |
77ca2332 | 1576 | * @token: user data, will be passed back to the fault handler |
0ed6d2d2 OBC |
1577 | * |
1578 | * This function should be used by IOMMU users which want to be notified | |
1579 | * whenever an IOMMU fault happens. | |
1580 | * | |
1581 | * The fault handler itself should return 0 on success, and an appropriate | |
1582 | * error code otherwise. | |
4f3f8d9d OBC |
1583 | */ |
1584 | void iommu_set_fault_handler(struct iommu_domain *domain, | |
77ca2332 OBC |
1585 | iommu_fault_handler_t handler, |
1586 | void *token) | |
4f3f8d9d OBC |
1587 | { |
1588 | BUG_ON(!domain); | |
1589 | ||
1590 | domain->handler = handler; | |
77ca2332 | 1591 | domain->handler_token = token; |
4f3f8d9d | 1592 | } |
30bd918c | 1593 | EXPORT_SYMBOL_GPL(iommu_set_fault_handler); |
4f3f8d9d | 1594 | |
53723dc5 JR |
1595 | static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus, |
1596 | unsigned type) | |
fc2100eb JR |
1597 | { |
1598 | struct iommu_domain *domain; | |
fc2100eb | 1599 | |
94441c3b | 1600 | if (bus == NULL || bus->iommu_ops == NULL) |
905d66c1 JR |
1601 | return NULL; |
1602 | ||
53723dc5 | 1603 | domain = bus->iommu_ops->domain_alloc(type); |
fc2100eb JR |
1604 | if (!domain) |
1605 | return NULL; | |
1606 | ||
8539c7c1 | 1607 | domain->ops = bus->iommu_ops; |
53723dc5 | 1608 | domain->type = type; |
d16e0faa RM |
1609 | /* Assume all sizes by default; the driver may override this later */ |
1610 | domain->pgsize_bitmap = bus->iommu_ops->pgsize_bitmap; | |
905d66c1 | 1611 | |
fc2100eb | 1612 | return domain; |
fc2100eb | 1613 | } |
fc2100eb | 1614 | |
53723dc5 JR |
1615 | struct iommu_domain *iommu_domain_alloc(struct bus_type *bus) |
1616 | { | |
1617 | return __iommu_domain_alloc(bus, IOMMU_DOMAIN_UNMANAGED); | |
fc2100eb JR |
1618 | } |
1619 | EXPORT_SYMBOL_GPL(iommu_domain_alloc); | |
1620 | ||
1621 | void iommu_domain_free(struct iommu_domain *domain) | |
1622 | { | |
89be34a1 | 1623 | domain->ops->domain_free(domain); |
fc2100eb JR |
1624 | } |
1625 | EXPORT_SYMBOL_GPL(iommu_domain_free); | |
1626 | ||
426a2738 JR |
1627 | static int __iommu_attach_device(struct iommu_domain *domain, |
1628 | struct device *dev) | |
fc2100eb | 1629 | { |
b54db778 | 1630 | int ret; |
e01d1913 BH |
1631 | if ((domain->ops->is_attach_deferred != NULL) && |
1632 | domain->ops->is_attach_deferred(domain, dev)) | |
1633 | return 0; | |
1634 | ||
e5aa7f00 JR |
1635 | if (unlikely(domain->ops->attach_dev == NULL)) |
1636 | return -ENODEV; | |
1637 | ||
b54db778 SK |
1638 | ret = domain->ops->attach_dev(domain, dev); |
1639 | if (!ret) | |
1640 | trace_attach_device_to_domain(dev); | |
1641 | return ret; | |
fc2100eb | 1642 | } |
426a2738 JR |
1643 | |
1644 | int iommu_attach_device(struct iommu_domain *domain, struct device *dev) | |
1645 | { | |
1646 | struct iommu_group *group; | |
1647 | int ret; | |
1648 | ||
1649 | group = iommu_group_get(dev); | |
9ae9df03 JC |
1650 | if (!group) |
1651 | return -ENODEV; | |
1652 | ||
426a2738 | 1653 | /* |
05f80300 | 1654 | * Lock the group to make sure the device-count doesn't |
426a2738 JR |
1655 | * change while we are attaching |
1656 | */ | |
1657 | mutex_lock(&group->mutex); | |
1658 | ret = -EINVAL; | |
1659 | if (iommu_group_device_count(group) != 1) | |
1660 | goto out_unlock; | |
1661 | ||
e39cb8a3 | 1662 | ret = __iommu_attach_group(domain, group); |
426a2738 JR |
1663 | |
1664 | out_unlock: | |
1665 | mutex_unlock(&group->mutex); | |
1666 | iommu_group_put(group); | |
1667 | ||
1668 | return ret; | |
1669 | } | |
fc2100eb JR |
1670 | EXPORT_SYMBOL_GPL(iommu_attach_device); |
1671 | ||
426a2738 JR |
1672 | static void __iommu_detach_device(struct iommu_domain *domain, |
1673 | struct device *dev) | |
fc2100eb | 1674 | { |
e01d1913 BH |
1675 | if ((domain->ops->is_attach_deferred != NULL) && |
1676 | domain->ops->is_attach_deferred(domain, dev)) | |
1677 | return; | |
1678 | ||
e5aa7f00 JR |
1679 | if (unlikely(domain->ops->detach_dev == NULL)) |
1680 | return; | |
1681 | ||
1682 | domain->ops->detach_dev(domain, dev); | |
69980630 | 1683 | trace_detach_device_from_domain(dev); |
fc2100eb | 1684 | } |
426a2738 JR |
1685 | |
1686 | void iommu_detach_device(struct iommu_domain *domain, struct device *dev) | |
1687 | { | |
1688 | struct iommu_group *group; | |
1689 | ||
1690 | group = iommu_group_get(dev); | |
9ae9df03 JC |
1691 | if (!group) |
1692 | return; | |
426a2738 JR |
1693 | |
1694 | mutex_lock(&group->mutex); | |
1695 | if (iommu_group_device_count(group) != 1) { | |
1696 | WARN_ON(1); | |
1697 | goto out_unlock; | |
1698 | } | |
1699 | ||
e39cb8a3 | 1700 | __iommu_detach_group(domain, group); |
426a2738 JR |
1701 | |
1702 | out_unlock: | |
1703 | mutex_unlock(&group->mutex); | |
1704 | iommu_group_put(group); | |
1705 | } | |
fc2100eb JR |
1706 | EXPORT_SYMBOL_GPL(iommu_detach_device); |
1707 | ||
2c1296d9 JR |
1708 | struct iommu_domain *iommu_get_domain_for_dev(struct device *dev) |
1709 | { | |
1710 | struct iommu_domain *domain; | |
1711 | struct iommu_group *group; | |
1712 | ||
1713 | group = iommu_group_get(dev); | |
1464d0b1 | 1714 | if (!group) |
2c1296d9 JR |
1715 | return NULL; |
1716 | ||
1717 | domain = group->domain; | |
1718 | ||
1719 | iommu_group_put(group); | |
1720 | ||
1721 | return domain; | |
1722 | } | |
1723 | EXPORT_SYMBOL_GPL(iommu_get_domain_for_dev); | |
fc2100eb | 1724 | |
d72e31c9 | 1725 | /* |
6af588fe RM |
1726 | * For IOMMU_DOMAIN_DMA implementations which already provide their own |
1727 | * guarantees that the group and its default domain are valid and correct. | |
1728 | */ | |
1729 | struct iommu_domain *iommu_get_dma_domain(struct device *dev) | |
1730 | { | |
1731 | return dev->iommu_group->default_domain; | |
1732 | } | |
1733 | ||
d72e31c9 | 1734 | /* |
35449adc | 1735 | * IOMMU groups are really the natural working unit of the IOMMU, but |
d72e31c9 AW |
1736 | * the IOMMU API works on domains and devices. Bridge that gap by |
1737 | * iterating over the devices in a group. Ideally we'd have a single | |
1738 | * device which represents the requestor ID of the group, but we also | |
1739 | * allow IOMMU drivers to create policy defined minimum sets, where | |
1740 | * the physical hardware may be able to distiguish members, but we | |
1741 | * wish to group them at a higher level (ex. untrusted multi-function | |
1742 | * PCI devices). Thus we attach each device. | |
1743 | */ | |
1744 | static int iommu_group_do_attach_device(struct device *dev, void *data) | |
1745 | { | |
1746 | struct iommu_domain *domain = data; | |
1747 | ||
426a2738 | 1748 | return __iommu_attach_device(domain, dev); |
d72e31c9 AW |
1749 | } |
1750 | ||
e39cb8a3 JR |
1751 | static int __iommu_attach_group(struct iommu_domain *domain, |
1752 | struct iommu_group *group) | |
1753 | { | |
1754 | int ret; | |
1755 | ||
1756 | if (group->default_domain && group->domain != group->default_domain) | |
1757 | return -EBUSY; | |
1758 | ||
1759 | ret = __iommu_group_for_each_dev(group, domain, | |
1760 | iommu_group_do_attach_device); | |
1761 | if (ret == 0) | |
1762 | group->domain = domain; | |
1763 | ||
1764 | return ret; | |
d72e31c9 AW |
1765 | } |
1766 | ||
1767 | int iommu_attach_group(struct iommu_domain *domain, struct iommu_group *group) | |
1768 | { | |
e39cb8a3 JR |
1769 | int ret; |
1770 | ||
1771 | mutex_lock(&group->mutex); | |
1772 | ret = __iommu_attach_group(domain, group); | |
1773 | mutex_unlock(&group->mutex); | |
1774 | ||
1775 | return ret; | |
d72e31c9 AW |
1776 | } |
1777 | EXPORT_SYMBOL_GPL(iommu_attach_group); | |
1778 | ||
1779 | static int iommu_group_do_detach_device(struct device *dev, void *data) | |
1780 | { | |
1781 | struct iommu_domain *domain = data; | |
1782 | ||
426a2738 | 1783 | __iommu_detach_device(domain, dev); |
d72e31c9 AW |
1784 | |
1785 | return 0; | |
1786 | } | |
1787 | ||
e39cb8a3 JR |
1788 | static void __iommu_detach_group(struct iommu_domain *domain, |
1789 | struct iommu_group *group) | |
1790 | { | |
1791 | int ret; | |
1792 | ||
1793 | if (!group->default_domain) { | |
1794 | __iommu_group_for_each_dev(group, domain, | |
1795 | iommu_group_do_detach_device); | |
1796 | group->domain = NULL; | |
1797 | return; | |
1798 | } | |
1799 | ||
1800 | if (group->domain == group->default_domain) | |
1801 | return; | |
1802 | ||
1803 | /* Detach by re-attaching to the default domain */ | |
1804 | ret = __iommu_group_for_each_dev(group, group->default_domain, | |
1805 | iommu_group_do_attach_device); | |
1806 | if (ret != 0) | |
1807 | WARN_ON(1); | |
1808 | else | |
1809 | group->domain = group->default_domain; | |
1810 | } | |
1811 | ||
d72e31c9 AW |
1812 | void iommu_detach_group(struct iommu_domain *domain, struct iommu_group *group) |
1813 | { | |
e39cb8a3 JR |
1814 | mutex_lock(&group->mutex); |
1815 | __iommu_detach_group(domain, group); | |
1816 | mutex_unlock(&group->mutex); | |
d72e31c9 AW |
1817 | } |
1818 | EXPORT_SYMBOL_GPL(iommu_detach_group); | |
1819 | ||
bb5547ac | 1820 | phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova) |
fc2100eb | 1821 | { |
e5aa7f00 JR |
1822 | if (unlikely(domain->ops->iova_to_phys == NULL)) |
1823 | return 0; | |
1824 | ||
1825 | return domain->ops->iova_to_phys(domain, iova); | |
fc2100eb JR |
1826 | } |
1827 | EXPORT_SYMBOL_GPL(iommu_iova_to_phys); | |
dbb9fd86 | 1828 | |
bd13969b AW |
1829 | static size_t iommu_pgsize(struct iommu_domain *domain, |
1830 | unsigned long addr_merge, size_t size) | |
1831 | { | |
1832 | unsigned int pgsize_idx; | |
1833 | size_t pgsize; | |
1834 | ||
1835 | /* Max page size that still fits into 'size' */ | |
1836 | pgsize_idx = __fls(size); | |
1837 | ||
1838 | /* need to consider alignment requirements ? */ | |
1839 | if (likely(addr_merge)) { | |
1840 | /* Max page size allowed by address */ | |
1841 | unsigned int align_pgsize_idx = __ffs(addr_merge); | |
1842 | pgsize_idx = min(pgsize_idx, align_pgsize_idx); | |
1843 | } | |
1844 | ||
1845 | /* build a mask of acceptable page sizes */ | |
1846 | pgsize = (1UL << (pgsize_idx + 1)) - 1; | |
1847 | ||
1848 | /* throw away page sizes not supported by the hardware */ | |
d16e0faa | 1849 | pgsize &= domain->pgsize_bitmap; |
bd13969b AW |
1850 | |
1851 | /* make sure we're still sane */ | |
1852 | BUG_ON(!pgsize); | |
1853 | ||
1854 | /* pick the biggest page */ | |
1855 | pgsize_idx = __fls(pgsize); | |
1856 | pgsize = 1UL << pgsize_idx; | |
1857 | ||
1858 | return pgsize; | |
1859 | } | |
1860 | ||
cefc53c7 | 1861 | int iommu_map(struct iommu_domain *domain, unsigned long iova, |
7d3002cc | 1862 | phys_addr_t paddr, size_t size, int prot) |
cefc53c7 | 1863 | { |
1d7ae53b | 1864 | const struct iommu_ops *ops = domain->ops; |
7d3002cc OBC |
1865 | unsigned long orig_iova = iova; |
1866 | unsigned int min_pagesz; | |
1867 | size_t orig_size = size; | |
06bfcaa9 | 1868 | phys_addr_t orig_paddr = paddr; |
7d3002cc | 1869 | int ret = 0; |
cefc53c7 | 1870 | |
1d7ae53b | 1871 | if (unlikely(ops->map == NULL || |
d16e0faa | 1872 | domain->pgsize_bitmap == 0UL)) |
e5aa7f00 | 1873 | return -ENODEV; |
cefc53c7 | 1874 | |
a10315e5 JR |
1875 | if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING))) |
1876 | return -EINVAL; | |
1877 | ||
7d3002cc | 1878 | /* find out the minimum page size supported */ |
d16e0faa | 1879 | min_pagesz = 1 << __ffs(domain->pgsize_bitmap); |
7d3002cc OBC |
1880 | |
1881 | /* | |
1882 | * both the virtual address and the physical one, as well as | |
1883 | * the size of the mapping, must be aligned (at least) to the | |
1884 | * size of the smallest page supported by the hardware | |
1885 | */ | |
1886 | if (!IS_ALIGNED(iova | paddr | size, min_pagesz)) { | |
abedb049 | 1887 | pr_err("unaligned: iova 0x%lx pa %pa size 0x%zx min_pagesz 0x%x\n", |
6197ca82 | 1888 | iova, &paddr, size, min_pagesz); |
7d3002cc OBC |
1889 | return -EINVAL; |
1890 | } | |
1891 | ||
abedb049 | 1892 | pr_debug("map: iova 0x%lx pa %pa size 0x%zx\n", iova, &paddr, size); |
7d3002cc OBC |
1893 | |
1894 | while (size) { | |
bd13969b | 1895 | size_t pgsize = iommu_pgsize(domain, iova | paddr, size); |
7d3002cc | 1896 | |
abedb049 | 1897 | pr_debug("mapping: iova 0x%lx pa %pa pgsize 0x%zx\n", |
6197ca82 | 1898 | iova, &paddr, pgsize); |
7d3002cc | 1899 | |
1d7ae53b | 1900 | ret = ops->map(domain, iova, paddr, pgsize, prot); |
7d3002cc OBC |
1901 | if (ret) |
1902 | break; | |
1903 | ||
1904 | iova += pgsize; | |
1905 | paddr += pgsize; | |
1906 | size -= pgsize; | |
1907 | } | |
1908 | ||
1d7ae53b DO |
1909 | if (ops->iotlb_sync_map) |
1910 | ops->iotlb_sync_map(domain); | |
1911 | ||
7d3002cc OBC |
1912 | /* unroll mapping in case something went wrong */ |
1913 | if (ret) | |
1914 | iommu_unmap(domain, orig_iova, orig_size - size); | |
e0be7c86 | 1915 | else |
06bfcaa9 | 1916 | trace_map(orig_iova, orig_paddr, orig_size); |
7d3002cc OBC |
1917 | |
1918 | return ret; | |
cefc53c7 JR |
1919 | } |
1920 | EXPORT_SYMBOL_GPL(iommu_map); | |
1921 | ||
add02cfd JR |
1922 | static size_t __iommu_unmap(struct iommu_domain *domain, |
1923 | unsigned long iova, size_t size, | |
a7d20dc1 | 1924 | struct iommu_iotlb_gather *iotlb_gather) |
cefc53c7 | 1925 | { |
add02cfd | 1926 | const struct iommu_ops *ops = domain->ops; |
7d3002cc | 1927 | size_t unmapped_page, unmapped = 0; |
6fd492fd | 1928 | unsigned long orig_iova = iova; |
add02cfd | 1929 | unsigned int min_pagesz; |
cefc53c7 | 1930 | |
add02cfd | 1931 | if (unlikely(ops->unmap == NULL || |
d16e0faa | 1932 | domain->pgsize_bitmap == 0UL)) |
c5611a87 | 1933 | return 0; |
e5aa7f00 | 1934 | |
a10315e5 | 1935 | if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING))) |
c5611a87 | 1936 | return 0; |
a10315e5 | 1937 | |
7d3002cc | 1938 | /* find out the minimum page size supported */ |
d16e0faa | 1939 | min_pagesz = 1 << __ffs(domain->pgsize_bitmap); |
7d3002cc OBC |
1940 | |
1941 | /* | |
1942 | * The virtual address, as well as the size of the mapping, must be | |
1943 | * aligned (at least) to the size of the smallest page supported | |
1944 | * by the hardware | |
1945 | */ | |
1946 | if (!IS_ALIGNED(iova | size, min_pagesz)) { | |
6197ca82 JP |
1947 | pr_err("unaligned: iova 0x%lx size 0x%zx min_pagesz 0x%x\n", |
1948 | iova, size, min_pagesz); | |
c5611a87 | 1949 | return 0; |
7d3002cc OBC |
1950 | } |
1951 | ||
6197ca82 | 1952 | pr_debug("unmap this: iova 0x%lx size 0x%zx\n", iova, size); |
7d3002cc OBC |
1953 | |
1954 | /* | |
1955 | * Keep iterating until we either unmap 'size' bytes (or more) | |
1956 | * or we hit an area that isn't mapped. | |
1957 | */ | |
1958 | while (unmapped < size) { | |
bd13969b | 1959 | size_t pgsize = iommu_pgsize(domain, iova, size - unmapped); |
7d3002cc | 1960 | |
56f8af5e | 1961 | unmapped_page = ops->unmap(domain, iova, pgsize, iotlb_gather); |
7d3002cc OBC |
1962 | if (!unmapped_page) |
1963 | break; | |
1964 | ||
6197ca82 JP |
1965 | pr_debug("unmapped: iova 0x%lx size 0x%zx\n", |
1966 | iova, unmapped_page); | |
7d3002cc OBC |
1967 | |
1968 | iova += unmapped_page; | |
1969 | unmapped += unmapped_page; | |
1970 | } | |
1971 | ||
db8614d3 | 1972 | trace_unmap(orig_iova, size, unmapped); |
7d3002cc | 1973 | return unmapped; |
cefc53c7 | 1974 | } |
add02cfd JR |
1975 | |
1976 | size_t iommu_unmap(struct iommu_domain *domain, | |
1977 | unsigned long iova, size_t size) | |
1978 | { | |
a7d20dc1 WD |
1979 | struct iommu_iotlb_gather iotlb_gather; |
1980 | size_t ret; | |
1981 | ||
1982 | iommu_iotlb_gather_init(&iotlb_gather); | |
1983 | ret = __iommu_unmap(domain, iova, size, &iotlb_gather); | |
1984 | iommu_tlb_sync(domain, &iotlb_gather); | |
1985 | ||
1986 | return ret; | |
add02cfd | 1987 | } |
cefc53c7 | 1988 | EXPORT_SYMBOL_GPL(iommu_unmap); |
1460432c | 1989 | |
add02cfd | 1990 | size_t iommu_unmap_fast(struct iommu_domain *domain, |
a7d20dc1 WD |
1991 | unsigned long iova, size_t size, |
1992 | struct iommu_iotlb_gather *iotlb_gather) | |
add02cfd | 1993 | { |
a7d20dc1 | 1994 | return __iommu_unmap(domain, iova, size, iotlb_gather); |
add02cfd JR |
1995 | } |
1996 | EXPORT_SYMBOL_GPL(iommu_unmap_fast); | |
1997 | ||
d88e61fa CH |
1998 | size_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova, |
1999 | struct scatterlist *sg, unsigned int nents, int prot) | |
315786eb | 2000 | { |
5d95f40e RM |
2001 | size_t len = 0, mapped = 0; |
2002 | phys_addr_t start; | |
2003 | unsigned int i = 0; | |
38ec010d | 2004 | int ret; |
315786eb | 2005 | |
5d95f40e RM |
2006 | while (i <= nents) { |
2007 | phys_addr_t s_phys = sg_phys(sg); | |
18f23409 | 2008 | |
5d95f40e RM |
2009 | if (len && s_phys != start + len) { |
2010 | ret = iommu_map(domain, iova + mapped, start, len, prot); | |
2011 | if (ret) | |
2012 | goto out_err; | |
18f23409 | 2013 | |
5d95f40e RM |
2014 | mapped += len; |
2015 | len = 0; | |
2016 | } | |
38ec010d | 2017 | |
5d95f40e RM |
2018 | if (len) { |
2019 | len += sg->length; | |
2020 | } else { | |
2021 | len = sg->length; | |
2022 | start = s_phys; | |
2023 | } | |
38ec010d | 2024 | |
5d95f40e RM |
2025 | if (++i < nents) |
2026 | sg = sg_next(sg); | |
315786eb OH |
2027 | } |
2028 | ||
2029 | return mapped; | |
38ec010d JR |
2030 | |
2031 | out_err: | |
2032 | /* undo mappings already done */ | |
2033 | iommu_unmap(domain, iova, mapped); | |
2034 | ||
2035 | return 0; | |
2036 | ||
315786eb | 2037 | } |
d88e61fa | 2038 | EXPORT_SYMBOL_GPL(iommu_map_sg); |
d7787d57 JR |
2039 | |
2040 | int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr, | |
80f97f0f | 2041 | phys_addr_t paddr, u64 size, int prot) |
d7787d57 JR |
2042 | { |
2043 | if (unlikely(domain->ops->domain_window_enable == NULL)) | |
2044 | return -ENODEV; | |
2045 | ||
80f97f0f VS |
2046 | return domain->ops->domain_window_enable(domain, wnd_nr, paddr, size, |
2047 | prot); | |
d7787d57 JR |
2048 | } |
2049 | EXPORT_SYMBOL_GPL(iommu_domain_window_enable); | |
2050 | ||
2051 | void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr) | |
2052 | { | |
2053 | if (unlikely(domain->ops->domain_window_disable == NULL)) | |
2054 | return; | |
2055 | ||
2056 | return domain->ops->domain_window_disable(domain, wnd_nr); | |
2057 | } | |
2058 | EXPORT_SYMBOL_GPL(iommu_domain_window_disable); | |
2059 | ||
207c6e36 JR |
2060 | /** |
2061 | * report_iommu_fault() - report about an IOMMU fault to the IOMMU framework | |
2062 | * @domain: the iommu domain where the fault has happened | |
2063 | * @dev: the device where the fault has happened | |
2064 | * @iova: the faulting address | |
2065 | * @flags: mmu fault flags (e.g. IOMMU_FAULT_READ/IOMMU_FAULT_WRITE/...) | |
2066 | * | |
2067 | * This function should be called by the low-level IOMMU implementations | |
2068 | * whenever IOMMU faults happen, to allow high-level users, that are | |
2069 | * interested in such events, to know about them. | |
2070 | * | |
2071 | * This event may be useful for several possible use cases: | |
2072 | * - mere logging of the event | |
2073 | * - dynamic TLB/PTE loading | |
2074 | * - if restarting of the faulting device is required | |
2075 | * | |
2076 | * Returns 0 on success and an appropriate error code otherwise (if dynamic | |
2077 | * PTE/TLB loading will one day be supported, implementations will be able | |
2078 | * to tell whether it succeeded or not according to this return value). | |
2079 | * | |
2080 | * Specifically, -ENOSYS is returned if a fault handler isn't installed | |
2081 | * (though fault handlers can also return -ENOSYS, in case they want to | |
2082 | * elicit the default behavior of the IOMMU drivers). | |
2083 | */ | |
2084 | int report_iommu_fault(struct iommu_domain *domain, struct device *dev, | |
2085 | unsigned long iova, int flags) | |
2086 | { | |
2087 | int ret = -ENOSYS; | |
2088 | ||
2089 | /* | |
2090 | * if upper layers showed interest and installed a fault handler, | |
2091 | * invoke it. | |
2092 | */ | |
2093 | if (domain->handler) | |
2094 | ret = domain->handler(domain, dev, iova, flags, | |
2095 | domain->handler_token); | |
2096 | ||
2097 | trace_io_page_fault(dev, iova, flags); | |
2098 | return ret; | |
2099 | } | |
2100 | EXPORT_SYMBOL_GPL(report_iommu_fault); | |
2101 | ||
d72e31c9 | 2102 | static int __init iommu_init(void) |
1460432c | 2103 | { |
d72e31c9 AW |
2104 | iommu_group_kset = kset_create_and_add("iommu_groups", |
2105 | NULL, kernel_kobj); | |
d72e31c9 AW |
2106 | BUG_ON(!iommu_group_kset); |
2107 | ||
bad614b2 GH |
2108 | iommu_debugfs_setup(); |
2109 | ||
d72e31c9 | 2110 | return 0; |
1460432c | 2111 | } |
d7ef9995 | 2112 | core_initcall(iommu_init); |
0cd76dd1 JR |
2113 | |
2114 | int iommu_domain_get_attr(struct iommu_domain *domain, | |
2115 | enum iommu_attr attr, void *data) | |
2116 | { | |
0ff64f80 | 2117 | struct iommu_domain_geometry *geometry; |
d2e12160 | 2118 | bool *paging; |
0ff64f80 JR |
2119 | int ret = 0; |
2120 | ||
2121 | switch (attr) { | |
2122 | case DOMAIN_ATTR_GEOMETRY: | |
2123 | geometry = data; | |
2124 | *geometry = domain->geometry; | |
2125 | ||
d2e12160 JR |
2126 | break; |
2127 | case DOMAIN_ATTR_PAGING: | |
2128 | paging = data; | |
d16e0faa | 2129 | *paging = (domain->pgsize_bitmap != 0UL); |
0ff64f80 JR |
2130 | break; |
2131 | default: | |
2132 | if (!domain->ops->domain_get_attr) | |
2133 | return -EINVAL; | |
0cd76dd1 | 2134 | |
0ff64f80 JR |
2135 | ret = domain->ops->domain_get_attr(domain, attr, data); |
2136 | } | |
2137 | ||
2138 | return ret; | |
0cd76dd1 JR |
2139 | } |
2140 | EXPORT_SYMBOL_GPL(iommu_domain_get_attr); | |
2141 | ||
2142 | int iommu_domain_set_attr(struct iommu_domain *domain, | |
2143 | enum iommu_attr attr, void *data) | |
2144 | { | |
69356712 | 2145 | int ret = 0; |
69356712 JR |
2146 | |
2147 | switch (attr) { | |
69356712 JR |
2148 | default: |
2149 | if (domain->ops->domain_set_attr == NULL) | |
2150 | return -EINVAL; | |
2151 | ||
2152 | ret = domain->ops->domain_set_attr(domain, attr, data); | |
2153 | } | |
2154 | ||
2155 | return ret; | |
1460432c | 2156 | } |
0cd76dd1 | 2157 | EXPORT_SYMBOL_GPL(iommu_domain_set_attr); |
a1015c2b | 2158 | |
e5b5234a | 2159 | void iommu_get_resv_regions(struct device *dev, struct list_head *list) |
a1015c2b JR |
2160 | { |
2161 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
2162 | ||
e5b5234a EA |
2163 | if (ops && ops->get_resv_regions) |
2164 | ops->get_resv_regions(dev, list); | |
a1015c2b JR |
2165 | } |
2166 | ||
e5b5234a | 2167 | void iommu_put_resv_regions(struct device *dev, struct list_head *list) |
a1015c2b JR |
2168 | { |
2169 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
2170 | ||
e5b5234a EA |
2171 | if (ops && ops->put_resv_regions) |
2172 | ops->put_resv_regions(dev, list); | |
a1015c2b | 2173 | } |
d290f1e7 | 2174 | |
2b20cbba | 2175 | struct iommu_resv_region *iommu_alloc_resv_region(phys_addr_t start, |
9d3a4de4 RM |
2176 | size_t length, int prot, |
2177 | enum iommu_resv_type type) | |
2b20cbba EA |
2178 | { |
2179 | struct iommu_resv_region *region; | |
2180 | ||
2181 | region = kzalloc(sizeof(*region), GFP_KERNEL); | |
2182 | if (!region) | |
2183 | return NULL; | |
2184 | ||
2185 | INIT_LIST_HEAD(®ion->list); | |
2186 | region->start = start; | |
2187 | region->length = length; | |
2188 | region->prot = prot; | |
2189 | region->type = type; | |
2190 | return region; | |
a1015c2b | 2191 | } |
d290f1e7 | 2192 | |
7423e017 LB |
2193 | static int |
2194 | request_default_domain_for_dev(struct device *dev, unsigned long type) | |
d290f1e7 | 2195 | { |
7423e017 | 2196 | struct iommu_domain *domain; |
d290f1e7 JR |
2197 | struct iommu_group *group; |
2198 | int ret; | |
2199 | ||
2200 | /* Device must already be in a group before calling this function */ | |
57274ea2 LB |
2201 | group = iommu_group_get(dev); |
2202 | if (!group) | |
2203 | return -EINVAL; | |
d290f1e7 JR |
2204 | |
2205 | mutex_lock(&group->mutex); | |
2206 | ||
d290f1e7 | 2207 | ret = 0; |
7423e017 | 2208 | if (group->default_domain && group->default_domain->type == type) |
d290f1e7 JR |
2209 | goto out; |
2210 | ||
2211 | /* Don't change mappings of existing devices */ | |
2212 | ret = -EBUSY; | |
2213 | if (iommu_group_device_count(group) != 1) | |
2214 | goto out; | |
2215 | ||
d290f1e7 | 2216 | ret = -ENOMEM; |
7423e017 LB |
2217 | domain = __iommu_domain_alloc(dev->bus, type); |
2218 | if (!domain) | |
d290f1e7 JR |
2219 | goto out; |
2220 | ||
2221 | /* Attach the device to the domain */ | |
7423e017 | 2222 | ret = __iommu_attach_group(domain, group); |
d290f1e7 | 2223 | if (ret) { |
7423e017 | 2224 | iommu_domain_free(domain); |
d290f1e7 JR |
2225 | goto out; |
2226 | } | |
2227 | ||
d127bc9b | 2228 | /* Make the domain the default for this group */ |
d290f1e7 JR |
2229 | if (group->default_domain) |
2230 | iommu_domain_free(group->default_domain); | |
7423e017 | 2231 | group->default_domain = domain; |
d290f1e7 | 2232 | |
53c4126c JS |
2233 | iommu_group_create_direct_mappings(group, dev); |
2234 | ||
7423e017 LB |
2235 | dev_info(dev, "Using iommu %s mapping\n", |
2236 | type == IOMMU_DOMAIN_DMA ? "dma" : "direct"); | |
d290f1e7 JR |
2237 | |
2238 | ret = 0; | |
2239 | out: | |
2240 | mutex_unlock(&group->mutex); | |
2241 | iommu_group_put(group); | |
2242 | ||
2243 | return ret; | |
2244 | } | |
57f98d2f | 2245 | |
7423e017 LB |
2246 | /* Request that a device is direct mapped by the IOMMU */ |
2247 | int iommu_request_dm_for_dev(struct device *dev) | |
2248 | { | |
2249 | return request_default_domain_for_dev(dev, IOMMU_DOMAIN_IDENTITY); | |
2250 | } | |
2251 | ||
2252 | /* Request that a device can't be direct mapped by the IOMMU */ | |
2253 | int iommu_request_dma_domain_for_dev(struct device *dev) | |
2254 | { | |
2255 | return request_default_domain_for_dev(dev, IOMMU_DOMAIN_DMA); | |
2256 | } | |
2257 | ||
8a69961c JR |
2258 | void iommu_set_default_passthrough(bool cmd_line) |
2259 | { | |
2260 | if (cmd_line) | |
2261 | iommu_set_cmd_line_dma_api(); | |
2262 | ||
2263 | iommu_def_domain_type = IOMMU_DOMAIN_IDENTITY; | |
2264 | } | |
2265 | ||
2266 | void iommu_set_default_translated(bool cmd_line) | |
2267 | { | |
2268 | if (cmd_line) | |
2269 | iommu_set_cmd_line_dma_api(); | |
2270 | ||
2271 | iommu_def_domain_type = IOMMU_DOMAIN_DMA; | |
2272 | } | |
2273 | ||
2274 | bool iommu_default_passthrough(void) | |
2275 | { | |
2276 | return iommu_def_domain_type == IOMMU_DOMAIN_IDENTITY; | |
2277 | } | |
2278 | EXPORT_SYMBOL_GPL(iommu_default_passthrough); | |
2279 | ||
534766df | 2280 | const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode) |
e4f10ffe | 2281 | { |
e4f10ffe | 2282 | const struct iommu_ops *ops = NULL; |
d0f6f583 | 2283 | struct iommu_device *iommu; |
e4f10ffe | 2284 | |
d0f6f583 JR |
2285 | spin_lock(&iommu_device_lock); |
2286 | list_for_each_entry(iommu, &iommu_device_list, list) | |
2287 | if (iommu->fwnode == fwnode) { | |
2288 | ops = iommu->ops; | |
e4f10ffe LP |
2289 | break; |
2290 | } | |
d0f6f583 | 2291 | spin_unlock(&iommu_device_lock); |
e4f10ffe LP |
2292 | return ops; |
2293 | } | |
2294 | ||
57f98d2f RM |
2295 | int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode, |
2296 | const struct iommu_ops *ops) | |
2297 | { | |
b4ef725e | 2298 | struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); |
57f98d2f RM |
2299 | |
2300 | if (fwspec) | |
2301 | return ops == fwspec->ops ? 0 : -EINVAL; | |
2302 | ||
2303 | fwspec = kzalloc(sizeof(*fwspec), GFP_KERNEL); | |
2304 | if (!fwspec) | |
2305 | return -ENOMEM; | |
2306 | ||
2307 | of_node_get(to_of_node(iommu_fwnode)); | |
2308 | fwspec->iommu_fwnode = iommu_fwnode; | |
2309 | fwspec->ops = ops; | |
b4ef725e | 2310 | dev_iommu_fwspec_set(dev, fwspec); |
57f98d2f RM |
2311 | return 0; |
2312 | } | |
2313 | EXPORT_SYMBOL_GPL(iommu_fwspec_init); | |
2314 | ||
2315 | void iommu_fwspec_free(struct device *dev) | |
2316 | { | |
b4ef725e | 2317 | struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); |
57f98d2f RM |
2318 | |
2319 | if (fwspec) { | |
2320 | fwnode_handle_put(fwspec->iommu_fwnode); | |
2321 | kfree(fwspec); | |
b4ef725e | 2322 | dev_iommu_fwspec_set(dev, NULL); |
57f98d2f RM |
2323 | } |
2324 | } | |
2325 | EXPORT_SYMBOL_GPL(iommu_fwspec_free); | |
2326 | ||
2327 | int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids) | |
2328 | { | |
b4ef725e | 2329 | struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); |
57f98d2f RM |
2330 | size_t size; |
2331 | int i; | |
2332 | ||
2333 | if (!fwspec) | |
2334 | return -EINVAL; | |
2335 | ||
2336 | size = offsetof(struct iommu_fwspec, ids[fwspec->num_ids + num_ids]); | |
2337 | if (size > sizeof(*fwspec)) { | |
b4ef725e | 2338 | fwspec = krealloc(fwspec, size, GFP_KERNEL); |
57f98d2f RM |
2339 | if (!fwspec) |
2340 | return -ENOMEM; | |
909111ba | 2341 | |
b4ef725e | 2342 | dev_iommu_fwspec_set(dev, fwspec); |
57f98d2f RM |
2343 | } |
2344 | ||
2345 | for (i = 0; i < num_ids; i++) | |
2346 | fwspec->ids[fwspec->num_ids + i] = ids[i]; | |
2347 | ||
2348 | fwspec->num_ids += num_ids; | |
57f98d2f RM |
2349 | return 0; |
2350 | } | |
2351 | EXPORT_SYMBOL_GPL(iommu_fwspec_add_ids); | |
a3a19592 LB |
2352 | |
2353 | /* | |
2354 | * Per device IOMMU features. | |
2355 | */ | |
2356 | bool iommu_dev_has_feature(struct device *dev, enum iommu_dev_features feat) | |
2357 | { | |
2358 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
2359 | ||
2360 | if (ops && ops->dev_has_feat) | |
2361 | return ops->dev_has_feat(dev, feat); | |
2362 | ||
2363 | return false; | |
2364 | } | |
2365 | EXPORT_SYMBOL_GPL(iommu_dev_has_feature); | |
2366 | ||
2367 | int iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features feat) | |
2368 | { | |
2369 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
2370 | ||
2371 | if (ops && ops->dev_enable_feat) | |
2372 | return ops->dev_enable_feat(dev, feat); | |
2373 | ||
2374 | return -ENODEV; | |
2375 | } | |
2376 | EXPORT_SYMBOL_GPL(iommu_dev_enable_feature); | |
2377 | ||
2378 | /* | |
2379 | * The device drivers should do the necessary cleanups before calling this. | |
2380 | * For example, before disabling the aux-domain feature, the device driver | |
2381 | * should detach all aux-domains. Otherwise, this will return -EBUSY. | |
2382 | */ | |
2383 | int iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features feat) | |
2384 | { | |
2385 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
2386 | ||
2387 | if (ops && ops->dev_disable_feat) | |
2388 | return ops->dev_disable_feat(dev, feat); | |
2389 | ||
2390 | return -EBUSY; | |
2391 | } | |
2392 | EXPORT_SYMBOL_GPL(iommu_dev_disable_feature); | |
2393 | ||
2394 | bool iommu_dev_feature_enabled(struct device *dev, enum iommu_dev_features feat) | |
2395 | { | |
2396 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
2397 | ||
2398 | if (ops && ops->dev_feat_enabled) | |
2399 | return ops->dev_feat_enabled(dev, feat); | |
2400 | ||
2401 | return false; | |
2402 | } | |
2403 | EXPORT_SYMBOL_GPL(iommu_dev_feature_enabled); | |
2404 | ||
2405 | /* | |
2406 | * Aux-domain specific attach/detach. | |
2407 | * | |
2408 | * Only works if iommu_dev_feature_enabled(dev, IOMMU_DEV_FEAT_AUX) returns | |
2409 | * true. Also, as long as domains are attached to a device through this | |
2410 | * interface, any tries to call iommu_attach_device() should fail | |
2411 | * (iommu_detach_device() can't fail, so we fail when trying to re-attach). | |
2412 | * This should make us safe against a device being attached to a guest as a | |
2413 | * whole while there are still pasid users on it (aux and sva). | |
2414 | */ | |
2415 | int iommu_aux_attach_device(struct iommu_domain *domain, struct device *dev) | |
2416 | { | |
2417 | int ret = -ENODEV; | |
2418 | ||
2419 | if (domain->ops->aux_attach_dev) | |
2420 | ret = domain->ops->aux_attach_dev(domain, dev); | |
2421 | ||
2422 | if (!ret) | |
2423 | trace_attach_device_to_domain(dev); | |
2424 | ||
2425 | return ret; | |
2426 | } | |
2427 | EXPORT_SYMBOL_GPL(iommu_aux_attach_device); | |
2428 | ||
2429 | void iommu_aux_detach_device(struct iommu_domain *domain, struct device *dev) | |
2430 | { | |
2431 | if (domain->ops->aux_detach_dev) { | |
2432 | domain->ops->aux_detach_dev(domain, dev); | |
2433 | trace_detach_device_from_domain(dev); | |
2434 | } | |
2435 | } | |
2436 | EXPORT_SYMBOL_GPL(iommu_aux_detach_device); | |
2437 | ||
2438 | int iommu_aux_get_pasid(struct iommu_domain *domain, struct device *dev) | |
2439 | { | |
2440 | int ret = -ENODEV; | |
2441 | ||
2442 | if (domain->ops->aux_get_pasid) | |
2443 | ret = domain->ops->aux_get_pasid(domain, dev); | |
2444 | ||
2445 | return ret; | |
2446 | } | |
2447 | EXPORT_SYMBOL_GPL(iommu_aux_get_pasid); | |
26b25a2b JPB |
2448 | |
2449 | /** | |
2450 | * iommu_sva_bind_device() - Bind a process address space to a device | |
2451 | * @dev: the device | |
2452 | * @mm: the mm to bind, caller must hold a reference to it | |
2453 | * | |
2454 | * Create a bond between device and address space, allowing the device to access | |
2455 | * the mm using the returned PASID. If a bond already exists between @device and | |
2456 | * @mm, it is returned and an additional reference is taken. Caller must call | |
2457 | * iommu_sva_unbind_device() to release each reference. | |
2458 | * | |
2459 | * iommu_dev_enable_feature(dev, IOMMU_DEV_FEAT_SVA) must be called first, to | |
2460 | * initialize the required SVA features. | |
2461 | * | |
2462 | * On error, returns an ERR_PTR value. | |
2463 | */ | |
2464 | struct iommu_sva * | |
2465 | iommu_sva_bind_device(struct device *dev, struct mm_struct *mm, void *drvdata) | |
2466 | { | |
2467 | struct iommu_group *group; | |
2468 | struct iommu_sva *handle = ERR_PTR(-EINVAL); | |
2469 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
2470 | ||
2471 | if (!ops || !ops->sva_bind) | |
2472 | return ERR_PTR(-ENODEV); | |
2473 | ||
2474 | group = iommu_group_get(dev); | |
2475 | if (!group) | |
2476 | return ERR_PTR(-ENODEV); | |
2477 | ||
2478 | /* Ensure device count and domain don't change while we're binding */ | |
2479 | mutex_lock(&group->mutex); | |
2480 | ||
2481 | /* | |
2482 | * To keep things simple, SVA currently doesn't support IOMMU groups | |
2483 | * with more than one device. Existing SVA-capable systems are not | |
2484 | * affected by the problems that required IOMMU groups (lack of ACS | |
2485 | * isolation, device ID aliasing and other hardware issues). | |
2486 | */ | |
2487 | if (iommu_group_device_count(group) != 1) | |
2488 | goto out_unlock; | |
2489 | ||
2490 | handle = ops->sva_bind(dev, mm, drvdata); | |
2491 | ||
2492 | out_unlock: | |
2493 | mutex_unlock(&group->mutex); | |
2494 | iommu_group_put(group); | |
2495 | ||
2496 | return handle; | |
2497 | } | |
2498 | EXPORT_SYMBOL_GPL(iommu_sva_bind_device); | |
2499 | ||
2500 | /** | |
2501 | * iommu_sva_unbind_device() - Remove a bond created with iommu_sva_bind_device | |
2502 | * @handle: the handle returned by iommu_sva_bind_device() | |
2503 | * | |
2504 | * Put reference to a bond between device and address space. The device should | |
2505 | * not be issuing any more transaction for this PASID. All outstanding page | |
2506 | * requests for this PASID must have been flushed to the IOMMU. | |
2507 | * | |
2508 | * Returns 0 on success, or an error value | |
2509 | */ | |
2510 | void iommu_sva_unbind_device(struct iommu_sva *handle) | |
2511 | { | |
2512 | struct iommu_group *group; | |
2513 | struct device *dev = handle->dev; | |
2514 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
2515 | ||
2516 | if (!ops || !ops->sva_unbind) | |
2517 | return; | |
2518 | ||
2519 | group = iommu_group_get(dev); | |
2520 | if (!group) | |
2521 | return; | |
2522 | ||
2523 | mutex_lock(&group->mutex); | |
2524 | ops->sva_unbind(handle); | |
2525 | mutex_unlock(&group->mutex); | |
2526 | ||
2527 | iommu_group_put(group); | |
2528 | } | |
2529 | EXPORT_SYMBOL_GPL(iommu_sva_unbind_device); | |
2530 | ||
2531 | int iommu_sva_set_ops(struct iommu_sva *handle, | |
2532 | const struct iommu_sva_ops *sva_ops) | |
2533 | { | |
2534 | if (handle->ops && handle->ops != sva_ops) | |
2535 | return -EEXIST; | |
2536 | ||
2537 | handle->ops = sva_ops; | |
2538 | return 0; | |
2539 | } | |
2540 | EXPORT_SYMBOL_GPL(iommu_sva_set_ops); | |
2541 | ||
2542 | int iommu_sva_get_pasid(struct iommu_sva *handle) | |
2543 | { | |
2544 | const struct iommu_ops *ops = handle->dev->bus->iommu_ops; | |
2545 | ||
2546 | if (!ops || !ops->sva_get_pasid) | |
2547 | return IOMMU_PASID_INVALID; | |
2548 | ||
2549 | return ops->sva_get_pasid(handle); | |
2550 | } | |
2551 | EXPORT_SYMBOL_GPL(iommu_sva_get_pasid); |