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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 | ||
315 | /* no merge needed on elements of different types than @nr */ | |
316 | if (iter->type != nr->type) { | |
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); |
d72e31c9 AW |
495 | kfree(group); |
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); | |
754 | err_free_name: | |
755 | kfree(device->name); | |
756 | err_remove_link: | |
757 | sysfs_remove_link(&dev->kobj, "iommu_group"); | |
758 | err_free_device: | |
759 | kfree(device); | |
780da9e4 | 760 | dev_err(dev, "Failed to add to iommu group %d: %d\n", group->id, ret); |
797a8b4d | 761 | return ret; |
1460432c | 762 | } |
d72e31c9 | 763 | EXPORT_SYMBOL_GPL(iommu_group_add_device); |
1460432c | 764 | |
d72e31c9 AW |
765 | /** |
766 | * iommu_group_remove_device - remove a device from it's current group | |
767 | * @dev: device to be removed | |
768 | * | |
769 | * This function is called by an iommu driver to remove the device from | |
770 | * it's current group. This decrements the iommu group reference count. | |
771 | */ | |
772 | void iommu_group_remove_device(struct device *dev) | |
773 | { | |
774 | struct iommu_group *group = dev->iommu_group; | |
c09e22d5 | 775 | struct group_device *tmp_device, *device = NULL; |
d72e31c9 | 776 | |
780da9e4 | 777 | dev_info(dev, "Removing from iommu group %d\n", group->id); |
269aa808 | 778 | |
d72e31c9 AW |
779 | /* Pre-notify listeners that a device is being removed. */ |
780 | blocking_notifier_call_chain(&group->notifier, | |
781 | IOMMU_GROUP_NOTIFY_DEL_DEVICE, dev); | |
782 | ||
783 | mutex_lock(&group->mutex); | |
784 | list_for_each_entry(tmp_device, &group->devices, list) { | |
785 | if (tmp_device->dev == dev) { | |
786 | device = tmp_device; | |
787 | list_del(&device->list); | |
788 | break; | |
789 | } | |
790 | } | |
791 | mutex_unlock(&group->mutex); | |
792 | ||
793 | if (!device) | |
794 | return; | |
795 | ||
796 | sysfs_remove_link(group->devices_kobj, device->name); | |
797 | sysfs_remove_link(&dev->kobj, "iommu_group"); | |
798 | ||
2e757086 SK |
799 | trace_remove_device_from_group(group->id, dev); |
800 | ||
d72e31c9 AW |
801 | kfree(device->name); |
802 | kfree(device); | |
803 | dev->iommu_group = NULL; | |
804 | kobject_put(group->devices_kobj); | |
805 | } | |
806 | EXPORT_SYMBOL_GPL(iommu_group_remove_device); | |
807 | ||
426a2738 JR |
808 | static int iommu_group_device_count(struct iommu_group *group) |
809 | { | |
c09e22d5 | 810 | struct group_device *entry; |
426a2738 JR |
811 | int ret = 0; |
812 | ||
813 | list_for_each_entry(entry, &group->devices, list) | |
814 | ret++; | |
815 | ||
816 | return ret; | |
817 | } | |
818 | ||
d72e31c9 AW |
819 | /** |
820 | * iommu_group_for_each_dev - iterate over each device in the group | |
821 | * @group: the group | |
822 | * @data: caller opaque data to be passed to callback function | |
823 | * @fn: caller supplied callback function | |
824 | * | |
825 | * This function is called by group users to iterate over group devices. | |
826 | * Callers should hold a reference count to the group during callback. | |
827 | * The group->mutex is held across callbacks, which will block calls to | |
828 | * iommu_group_add/remove_device. | |
829 | */ | |
e39cb8a3 JR |
830 | static int __iommu_group_for_each_dev(struct iommu_group *group, void *data, |
831 | int (*fn)(struct device *, void *)) | |
d72e31c9 | 832 | { |
c09e22d5 | 833 | struct group_device *device; |
d72e31c9 AW |
834 | int ret = 0; |
835 | ||
d72e31c9 AW |
836 | list_for_each_entry(device, &group->devices, list) { |
837 | ret = fn(device->dev, data); | |
838 | if (ret) | |
839 | break; | |
840 | } | |
e39cb8a3 JR |
841 | return ret; |
842 | } | |
843 | ||
844 | ||
845 | int iommu_group_for_each_dev(struct iommu_group *group, void *data, | |
846 | int (*fn)(struct device *, void *)) | |
847 | { | |
848 | int ret; | |
849 | ||
850 | mutex_lock(&group->mutex); | |
851 | ret = __iommu_group_for_each_dev(group, data, fn); | |
d72e31c9 | 852 | mutex_unlock(&group->mutex); |
e39cb8a3 | 853 | |
d72e31c9 AW |
854 | return ret; |
855 | } | |
856 | EXPORT_SYMBOL_GPL(iommu_group_for_each_dev); | |
857 | ||
858 | /** | |
859 | * iommu_group_get - Return the group for a device and increment reference | |
860 | * @dev: get the group that this device belongs to | |
861 | * | |
862 | * This function is called by iommu drivers and users to get the group | |
863 | * for the specified device. If found, the group is returned and the group | |
864 | * reference in incremented, else NULL. | |
865 | */ | |
866 | struct iommu_group *iommu_group_get(struct device *dev) | |
867 | { | |
868 | struct iommu_group *group = dev->iommu_group; | |
869 | ||
870 | if (group) | |
871 | kobject_get(group->devices_kobj); | |
872 | ||
873 | return group; | |
874 | } | |
875 | EXPORT_SYMBOL_GPL(iommu_group_get); | |
876 | ||
13f59a78 RM |
877 | /** |
878 | * iommu_group_ref_get - Increment reference on a group | |
879 | * @group: the group to use, must not be NULL | |
880 | * | |
881 | * This function is called by iommu drivers to take additional references on an | |
882 | * existing group. Returns the given group for convenience. | |
883 | */ | |
884 | struct iommu_group *iommu_group_ref_get(struct iommu_group *group) | |
885 | { | |
886 | kobject_get(group->devices_kobj); | |
887 | return group; | |
888 | } | |
889 | ||
d72e31c9 AW |
890 | /** |
891 | * iommu_group_put - Decrement group reference | |
892 | * @group: the group to use | |
893 | * | |
894 | * This function is called by iommu drivers and users to release the | |
895 | * iommu group. Once the reference count is zero, the group is released. | |
896 | */ | |
897 | void iommu_group_put(struct iommu_group *group) | |
898 | { | |
899 | if (group) | |
900 | kobject_put(group->devices_kobj); | |
901 | } | |
902 | EXPORT_SYMBOL_GPL(iommu_group_put); | |
903 | ||
904 | /** | |
905 | * iommu_group_register_notifier - Register a notifier for group changes | |
906 | * @group: the group to watch | |
907 | * @nb: notifier block to signal | |
908 | * | |
909 | * This function allows iommu group users to track changes in a group. | |
910 | * See include/linux/iommu.h for actions sent via this notifier. Caller | |
911 | * should hold a reference to the group throughout notifier registration. | |
912 | */ | |
913 | int iommu_group_register_notifier(struct iommu_group *group, | |
914 | struct notifier_block *nb) | |
915 | { | |
916 | return blocking_notifier_chain_register(&group->notifier, nb); | |
917 | } | |
918 | EXPORT_SYMBOL_GPL(iommu_group_register_notifier); | |
919 | ||
920 | /** | |
921 | * iommu_group_unregister_notifier - Unregister a notifier | |
922 | * @group: the group to watch | |
923 | * @nb: notifier block to signal | |
924 | * | |
925 | * Unregister a previously registered group notifier block. | |
926 | */ | |
927 | int iommu_group_unregister_notifier(struct iommu_group *group, | |
928 | struct notifier_block *nb) | |
929 | { | |
930 | return blocking_notifier_chain_unregister(&group->notifier, nb); | |
931 | } | |
932 | EXPORT_SYMBOL_GPL(iommu_group_unregister_notifier); | |
933 | ||
0c830e6b JP |
934 | /** |
935 | * iommu_register_device_fault_handler() - Register a device fault handler | |
936 | * @dev: the device | |
937 | * @handler: the fault handler | |
938 | * @data: private data passed as argument to the handler | |
939 | * | |
940 | * When an IOMMU fault event is received, this handler gets called with the | |
bf3255b3 JPB |
941 | * fault event and data as argument. The handler should return 0 on success. If |
942 | * the fault is recoverable (IOMMU_FAULT_PAGE_REQ), the consumer should also | |
943 | * complete the fault by calling iommu_page_response() with one of the following | |
944 | * response code: | |
945 | * - IOMMU_PAGE_RESP_SUCCESS: retry the translation | |
946 | * - IOMMU_PAGE_RESP_INVALID: terminate the fault | |
947 | * - IOMMU_PAGE_RESP_FAILURE: terminate the fault and stop reporting | |
948 | * page faults if possible. | |
0c830e6b JP |
949 | * |
950 | * Return 0 if the fault handler was installed successfully, or an error. | |
951 | */ | |
952 | int iommu_register_device_fault_handler(struct device *dev, | |
953 | iommu_dev_fault_handler_t handler, | |
954 | void *data) | |
955 | { | |
956 | struct iommu_param *param = dev->iommu_param; | |
957 | int ret = 0; | |
958 | ||
959 | if (!param) | |
960 | return -EINVAL; | |
961 | ||
962 | mutex_lock(¶m->lock); | |
963 | /* Only allow one fault handler registered for each device */ | |
964 | if (param->fault_param) { | |
965 | ret = -EBUSY; | |
966 | goto done_unlock; | |
967 | } | |
968 | ||
969 | get_device(dev); | |
970 | param->fault_param = kzalloc(sizeof(*param->fault_param), GFP_KERNEL); | |
971 | if (!param->fault_param) { | |
972 | put_device(dev); | |
973 | ret = -ENOMEM; | |
974 | goto done_unlock; | |
975 | } | |
976 | param->fault_param->handler = handler; | |
977 | param->fault_param->data = data; | |
bf3255b3 JPB |
978 | mutex_init(¶m->fault_param->lock); |
979 | INIT_LIST_HEAD(¶m->fault_param->faults); | |
0c830e6b JP |
980 | |
981 | done_unlock: | |
982 | mutex_unlock(¶m->lock); | |
983 | ||
984 | return ret; | |
985 | } | |
986 | EXPORT_SYMBOL_GPL(iommu_register_device_fault_handler); | |
987 | ||
988 | /** | |
989 | * iommu_unregister_device_fault_handler() - Unregister the device fault handler | |
990 | * @dev: the device | |
991 | * | |
992 | * Remove the device fault handler installed with | |
993 | * iommu_register_device_fault_handler(). | |
994 | * | |
995 | * Return 0 on success, or an error. | |
996 | */ | |
997 | int iommu_unregister_device_fault_handler(struct device *dev) | |
998 | { | |
999 | struct iommu_param *param = dev->iommu_param; | |
1000 | int ret = 0; | |
1001 | ||
1002 | if (!param) | |
1003 | return -EINVAL; | |
1004 | ||
1005 | mutex_lock(¶m->lock); | |
1006 | ||
1007 | if (!param->fault_param) | |
1008 | goto unlock; | |
1009 | ||
bf3255b3 JPB |
1010 | /* we cannot unregister handler if there are pending faults */ |
1011 | if (!list_empty(¶m->fault_param->faults)) { | |
1012 | ret = -EBUSY; | |
1013 | goto unlock; | |
1014 | } | |
1015 | ||
0c830e6b JP |
1016 | kfree(param->fault_param); |
1017 | param->fault_param = NULL; | |
1018 | put_device(dev); | |
1019 | unlock: | |
1020 | mutex_unlock(¶m->lock); | |
1021 | ||
1022 | return ret; | |
1023 | } | |
1024 | EXPORT_SYMBOL_GPL(iommu_unregister_device_fault_handler); | |
1025 | ||
1026 | /** | |
1027 | * iommu_report_device_fault() - Report fault event to device driver | |
1028 | * @dev: the device | |
1029 | * @evt: fault event data | |
1030 | * | |
1031 | * Called by IOMMU drivers when a fault is detected, typically in a threaded IRQ | |
bf3255b3 JPB |
1032 | * handler. When this function fails and the fault is recoverable, it is the |
1033 | * caller's responsibility to complete the fault. | |
0c830e6b JP |
1034 | * |
1035 | * Return 0 on success, or an error. | |
1036 | */ | |
1037 | int iommu_report_device_fault(struct device *dev, struct iommu_fault_event *evt) | |
1038 | { | |
1039 | struct iommu_param *param = dev->iommu_param; | |
bf3255b3 | 1040 | struct iommu_fault_event *evt_pending = NULL; |
0c830e6b JP |
1041 | struct iommu_fault_param *fparam; |
1042 | int ret = 0; | |
1043 | ||
1044 | if (!param || !evt) | |
1045 | return -EINVAL; | |
1046 | ||
1047 | /* we only report device fault if there is a handler registered */ | |
1048 | mutex_lock(¶m->lock); | |
1049 | fparam = param->fault_param; | |
1050 | if (!fparam || !fparam->handler) { | |
1051 | ret = -EINVAL; | |
1052 | goto done_unlock; | |
1053 | } | |
bf3255b3 JPB |
1054 | |
1055 | if (evt->fault.type == IOMMU_FAULT_PAGE_REQ && | |
1056 | (evt->fault.prm.flags & IOMMU_FAULT_PAGE_REQUEST_LAST_PAGE)) { | |
1057 | evt_pending = kmemdup(evt, sizeof(struct iommu_fault_event), | |
1058 | GFP_KERNEL); | |
1059 | if (!evt_pending) { | |
1060 | ret = -ENOMEM; | |
1061 | goto done_unlock; | |
1062 | } | |
1063 | mutex_lock(&fparam->lock); | |
1064 | list_add_tail(&evt_pending->list, &fparam->faults); | |
1065 | mutex_unlock(&fparam->lock); | |
1066 | } | |
1067 | ||
0c830e6b | 1068 | ret = fparam->handler(&evt->fault, fparam->data); |
bf3255b3 JPB |
1069 | if (ret && evt_pending) { |
1070 | mutex_lock(&fparam->lock); | |
1071 | list_del(&evt_pending->list); | |
1072 | mutex_unlock(&fparam->lock); | |
1073 | kfree(evt_pending); | |
1074 | } | |
0c830e6b JP |
1075 | done_unlock: |
1076 | mutex_unlock(¶m->lock); | |
1077 | return ret; | |
1078 | } | |
1079 | EXPORT_SYMBOL_GPL(iommu_report_device_fault); | |
1080 | ||
bf3255b3 JPB |
1081 | int iommu_page_response(struct device *dev, |
1082 | struct iommu_page_response *msg) | |
1083 | { | |
1084 | bool pasid_valid; | |
1085 | int ret = -EINVAL; | |
1086 | struct iommu_fault_event *evt; | |
1087 | struct iommu_fault_page_request *prm; | |
1088 | struct iommu_param *param = dev->iommu_param; | |
1089 | struct iommu_domain *domain = iommu_get_domain_for_dev(dev); | |
1090 | ||
1091 | if (!domain || !domain->ops->page_response) | |
1092 | return -ENODEV; | |
1093 | ||
1094 | if (!param || !param->fault_param) | |
1095 | return -EINVAL; | |
1096 | ||
1097 | if (msg->version != IOMMU_PAGE_RESP_VERSION_1 || | |
1098 | msg->flags & ~IOMMU_PAGE_RESP_PASID_VALID) | |
1099 | return -EINVAL; | |
1100 | ||
1101 | /* Only send response if there is a fault report pending */ | |
1102 | mutex_lock(¶m->fault_param->lock); | |
1103 | if (list_empty(¶m->fault_param->faults)) { | |
1104 | dev_warn_ratelimited(dev, "no pending PRQ, drop response\n"); | |
1105 | goto done_unlock; | |
1106 | } | |
1107 | /* | |
1108 | * Check if we have a matching page request pending to respond, | |
1109 | * otherwise return -EINVAL | |
1110 | */ | |
1111 | list_for_each_entry(evt, ¶m->fault_param->faults, list) { | |
1112 | prm = &evt->fault.prm; | |
1113 | pasid_valid = prm->flags & IOMMU_FAULT_PAGE_REQUEST_PASID_VALID; | |
1114 | ||
1115 | if ((pasid_valid && prm->pasid != msg->pasid) || | |
1116 | prm->grpid != msg->grpid) | |
1117 | continue; | |
1118 | ||
1119 | /* Sanitize the reply */ | |
1120 | msg->flags = pasid_valid ? IOMMU_PAGE_RESP_PASID_VALID : 0; | |
1121 | ||
1122 | ret = domain->ops->page_response(dev, evt, msg); | |
1123 | list_del(&evt->list); | |
1124 | kfree(evt); | |
1125 | break; | |
1126 | } | |
1127 | ||
1128 | done_unlock: | |
1129 | mutex_unlock(¶m->fault_param->lock); | |
1130 | return ret; | |
1131 | } | |
1132 | EXPORT_SYMBOL_GPL(iommu_page_response); | |
1133 | ||
d72e31c9 AW |
1134 | /** |
1135 | * iommu_group_id - Return ID for a group | |
1136 | * @group: the group to ID | |
1137 | * | |
1138 | * Return the unique ID for the group matching the sysfs group number. | |
1139 | */ | |
1140 | int iommu_group_id(struct iommu_group *group) | |
1141 | { | |
1142 | return group->id; | |
1143 | } | |
1144 | EXPORT_SYMBOL_GPL(iommu_group_id); | |
1460432c | 1145 | |
f096c061 AW |
1146 | static struct iommu_group *get_pci_alias_group(struct pci_dev *pdev, |
1147 | unsigned long *devfns); | |
1148 | ||
104a1c13 AW |
1149 | /* |
1150 | * To consider a PCI device isolated, we require ACS to support Source | |
1151 | * Validation, Request Redirection, Completer Redirection, and Upstream | |
1152 | * Forwarding. This effectively means that devices cannot spoof their | |
1153 | * requester ID, requests and completions cannot be redirected, and all | |
1154 | * transactions are forwarded upstream, even as it passes through a | |
1155 | * bridge where the target device is downstream. | |
1156 | */ | |
1157 | #define REQ_ACS_FLAGS (PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF) | |
1158 | ||
f096c061 AW |
1159 | /* |
1160 | * For multifunction devices which are not isolated from each other, find | |
1161 | * all the other non-isolated functions and look for existing groups. For | |
1162 | * each function, we also need to look for aliases to or from other devices | |
1163 | * that may already have a group. | |
1164 | */ | |
1165 | static struct iommu_group *get_pci_function_alias_group(struct pci_dev *pdev, | |
1166 | unsigned long *devfns) | |
1167 | { | |
1168 | struct pci_dev *tmp = NULL; | |
1169 | struct iommu_group *group; | |
1170 | ||
1171 | if (!pdev->multifunction || pci_acs_enabled(pdev, REQ_ACS_FLAGS)) | |
1172 | return NULL; | |
1173 | ||
1174 | for_each_pci_dev(tmp) { | |
1175 | if (tmp == pdev || tmp->bus != pdev->bus || | |
1176 | PCI_SLOT(tmp->devfn) != PCI_SLOT(pdev->devfn) || | |
1177 | pci_acs_enabled(tmp, REQ_ACS_FLAGS)) | |
1178 | continue; | |
1179 | ||
1180 | group = get_pci_alias_group(tmp, devfns); | |
1181 | if (group) { | |
1182 | pci_dev_put(tmp); | |
1183 | return group; | |
1184 | } | |
1185 | } | |
1186 | ||
1187 | return NULL; | |
1188 | } | |
1189 | ||
1190 | /* | |
338c3149 JL |
1191 | * Look for aliases to or from the given device for existing groups. DMA |
1192 | * aliases are only supported on the same bus, therefore the search | |
f096c061 AW |
1193 | * space is quite small (especially since we're really only looking at pcie |
1194 | * device, and therefore only expect multiple slots on the root complex or | |
1195 | * downstream switch ports). It's conceivable though that a pair of | |
1196 | * multifunction devices could have aliases between them that would cause a | |
1197 | * loop. To prevent this, we use a bitmap to track where we've been. | |
1198 | */ | |
1199 | static struct iommu_group *get_pci_alias_group(struct pci_dev *pdev, | |
1200 | unsigned long *devfns) | |
1201 | { | |
1202 | struct pci_dev *tmp = NULL; | |
1203 | struct iommu_group *group; | |
1204 | ||
1205 | if (test_and_set_bit(pdev->devfn & 0xff, devfns)) | |
1206 | return NULL; | |
1207 | ||
1208 | group = iommu_group_get(&pdev->dev); | |
1209 | if (group) | |
1210 | return group; | |
1211 | ||
1212 | for_each_pci_dev(tmp) { | |
1213 | if (tmp == pdev || tmp->bus != pdev->bus) | |
1214 | continue; | |
1215 | ||
1216 | /* We alias them or they alias us */ | |
338c3149 | 1217 | if (pci_devs_are_dma_aliases(pdev, tmp)) { |
f096c061 AW |
1218 | group = get_pci_alias_group(tmp, devfns); |
1219 | if (group) { | |
1220 | pci_dev_put(tmp); | |
1221 | return group; | |
1222 | } | |
1223 | ||
1224 | group = get_pci_function_alias_group(tmp, devfns); | |
1225 | if (group) { | |
1226 | pci_dev_put(tmp); | |
1227 | return group; | |
1228 | } | |
1229 | } | |
1230 | } | |
1231 | ||
1232 | return NULL; | |
1233 | } | |
1234 | ||
104a1c13 AW |
1235 | struct group_for_pci_data { |
1236 | struct pci_dev *pdev; | |
1237 | struct iommu_group *group; | |
1238 | }; | |
1239 | ||
1240 | /* | |
1241 | * DMA alias iterator callback, return the last seen device. Stop and return | |
1242 | * the IOMMU group if we find one along the way. | |
1243 | */ | |
1244 | static int get_pci_alias_or_group(struct pci_dev *pdev, u16 alias, void *opaque) | |
1245 | { | |
1246 | struct group_for_pci_data *data = opaque; | |
1247 | ||
1248 | data->pdev = pdev; | |
1249 | data->group = iommu_group_get(&pdev->dev); | |
1250 | ||
1251 | return data->group != NULL; | |
1252 | } | |
1253 | ||
6eab556a JR |
1254 | /* |
1255 | * Generic device_group call-back function. It just allocates one | |
1256 | * iommu-group per device. | |
1257 | */ | |
1258 | struct iommu_group *generic_device_group(struct device *dev) | |
1259 | { | |
7f7a2304 | 1260 | return iommu_group_alloc(); |
6eab556a JR |
1261 | } |
1262 | ||
104a1c13 AW |
1263 | /* |
1264 | * Use standard PCI bus topology, isolation features, and DMA alias quirks | |
1265 | * to find or create an IOMMU group for a device. | |
1266 | */ | |
5e62292b | 1267 | struct iommu_group *pci_device_group(struct device *dev) |
104a1c13 | 1268 | { |
5e62292b | 1269 | struct pci_dev *pdev = to_pci_dev(dev); |
104a1c13 AW |
1270 | struct group_for_pci_data data; |
1271 | struct pci_bus *bus; | |
1272 | struct iommu_group *group = NULL; | |
f096c061 | 1273 | u64 devfns[4] = { 0 }; |
104a1c13 | 1274 | |
5e62292b JR |
1275 | if (WARN_ON(!dev_is_pci(dev))) |
1276 | return ERR_PTR(-EINVAL); | |
1277 | ||
104a1c13 AW |
1278 | /* |
1279 | * Find the upstream DMA alias for the device. A device must not | |
1280 | * be aliased due to topology in order to have its own IOMMU group. | |
1281 | * If we find an alias along the way that already belongs to a | |
1282 | * group, use it. | |
1283 | */ | |
1284 | if (pci_for_each_dma_alias(pdev, get_pci_alias_or_group, &data)) | |
1285 | return data.group; | |
1286 | ||
1287 | pdev = data.pdev; | |
1288 | ||
1289 | /* | |
1290 | * Continue upstream from the point of minimum IOMMU granularity | |
1291 | * due to aliases to the point where devices are protected from | |
1292 | * peer-to-peer DMA by PCI ACS. Again, if we find an existing | |
1293 | * group, use it. | |
1294 | */ | |
1295 | for (bus = pdev->bus; !pci_is_root_bus(bus); bus = bus->parent) { | |
1296 | if (!bus->self) | |
1297 | continue; | |
1298 | ||
1299 | if (pci_acs_path_enabled(bus->self, NULL, REQ_ACS_FLAGS)) | |
1300 | break; | |
1301 | ||
1302 | pdev = bus->self; | |
1303 | ||
1304 | group = iommu_group_get(&pdev->dev); | |
1305 | if (group) | |
1306 | return group; | |
1307 | } | |
1308 | ||
1309 | /* | |
f096c061 AW |
1310 | * Look for existing groups on device aliases. If we alias another |
1311 | * device or another device aliases us, use the same group. | |
104a1c13 | 1312 | */ |
f096c061 AW |
1313 | group = get_pci_alias_group(pdev, (unsigned long *)devfns); |
1314 | if (group) | |
1315 | return group; | |
104a1c13 AW |
1316 | |
1317 | /* | |
f096c061 AW |
1318 | * Look for existing groups on non-isolated functions on the same |
1319 | * slot and aliases of those funcions, if any. No need to clear | |
1320 | * the search bitmap, the tested devfns are still valid. | |
104a1c13 | 1321 | */ |
f096c061 AW |
1322 | group = get_pci_function_alias_group(pdev, (unsigned long *)devfns); |
1323 | if (group) | |
1324 | return group; | |
104a1c13 AW |
1325 | |
1326 | /* No shared group found, allocate new */ | |
7f7a2304 | 1327 | return iommu_group_alloc(); |
104a1c13 AW |
1328 | } |
1329 | ||
eab03e2a NG |
1330 | /* Get the IOMMU group for device on fsl-mc bus */ |
1331 | struct iommu_group *fsl_mc_device_group(struct device *dev) | |
1332 | { | |
1333 | struct device *cont_dev = fsl_mc_cont_dev(dev); | |
1334 | struct iommu_group *group; | |
1335 | ||
1336 | group = iommu_group_get(cont_dev); | |
1337 | if (!group) | |
1338 | group = iommu_group_alloc(); | |
1339 | return group; | |
1340 | } | |
1341 | ||
104a1c13 AW |
1342 | /** |
1343 | * iommu_group_get_for_dev - Find or create the IOMMU group for a device | |
1344 | * @dev: target device | |
1345 | * | |
1346 | * This function is intended to be called by IOMMU drivers and extended to | |
1347 | * support common, bus-defined algorithms when determining or creating the | |
1348 | * IOMMU group for a device. On success, the caller will hold a reference | |
1349 | * to the returned IOMMU group, which will already include the provided | |
1350 | * device. The reference should be released with iommu_group_put(). | |
1351 | */ | |
1352 | struct iommu_group *iommu_group_get_for_dev(struct device *dev) | |
1353 | { | |
46c6b2bc | 1354 | const struct iommu_ops *ops = dev->bus->iommu_ops; |
c4a783b8 | 1355 | struct iommu_group *group; |
104a1c13 AW |
1356 | int ret; |
1357 | ||
1358 | group = iommu_group_get(dev); | |
1359 | if (group) | |
1360 | return group; | |
1361 | ||
05f80300 RM |
1362 | if (!ops) |
1363 | return ERR_PTR(-EINVAL); | |
104a1c13 | 1364 | |
05f80300 | 1365 | group = ops->device_group(dev); |
72dcac63 JR |
1366 | if (WARN_ON_ONCE(group == NULL)) |
1367 | return ERR_PTR(-EINVAL); | |
1368 | ||
104a1c13 AW |
1369 | if (IS_ERR(group)) |
1370 | return group; | |
1371 | ||
1228236d JR |
1372 | /* |
1373 | * Try to allocate a default domain - needs support from the | |
1374 | * IOMMU driver. | |
1375 | */ | |
1376 | if (!group->default_domain) { | |
fccb4e3b WD |
1377 | struct iommu_domain *dom; |
1378 | ||
1379 | dom = __iommu_domain_alloc(dev->bus, iommu_def_domain_type); | |
1380 | if (!dom && iommu_def_domain_type != IOMMU_DOMAIN_DMA) { | |
fccb4e3b | 1381 | dom = __iommu_domain_alloc(dev->bus, IOMMU_DOMAIN_DMA); |
8bc32a28 JR |
1382 | if (dom) { |
1383 | dev_warn(dev, | |
1384 | "failed to allocate default IOMMU domain of type %u; falling back to IOMMU_DOMAIN_DMA", | |
1385 | iommu_def_domain_type); | |
1386 | } | |
fccb4e3b WD |
1387 | } |
1388 | ||
1389 | group->default_domain = dom; | |
eebb8034 | 1390 | if (!group->domain) |
fccb4e3b | 1391 | group->domain = dom; |
68a6efe8 ZL |
1392 | |
1393 | if (dom && !iommu_dma_strict) { | |
1394 | int attr = 1; | |
1395 | iommu_domain_set_attr(dom, | |
1396 | DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE, | |
1397 | &attr); | |
1398 | } | |
1228236d JR |
1399 | } |
1400 | ||
104a1c13 AW |
1401 | ret = iommu_group_add_device(group, dev); |
1402 | if (ret) { | |
1403 | iommu_group_put(group); | |
1404 | return ERR_PTR(ret); | |
1405 | } | |
1406 | ||
1407 | return group; | |
1408 | } | |
1409 | ||
6827ca83 JR |
1410 | struct iommu_domain *iommu_group_default_domain(struct iommu_group *group) |
1411 | { | |
1412 | return group->default_domain; | |
1413 | } | |
1414 | ||
d72e31c9 | 1415 | static int add_iommu_group(struct device *dev, void *data) |
1460432c | 1416 | { |
cc5aed44 | 1417 | int ret = iommu_probe_device(dev); |
38667f18 JR |
1418 | |
1419 | /* | |
1420 | * We ignore -ENODEV errors for now, as they just mean that the | |
1421 | * device is not translated by an IOMMU. We still care about | |
1422 | * other errors and fail to initialize when they happen. | |
1423 | */ | |
1424 | if (ret == -ENODEV) | |
1425 | ret = 0; | |
1426 | ||
1427 | return ret; | |
1460432c AW |
1428 | } |
1429 | ||
8da30142 JR |
1430 | static int remove_iommu_group(struct device *dev, void *data) |
1431 | { | |
cc5aed44 | 1432 | iommu_release_device(dev); |
1460432c AW |
1433 | |
1434 | return 0; | |
1435 | } | |
1436 | ||
d72e31c9 AW |
1437 | static int iommu_bus_notifier(struct notifier_block *nb, |
1438 | unsigned long action, void *data) | |
1460432c | 1439 | { |
cc5aed44 | 1440 | unsigned long group_action = 0; |
1460432c | 1441 | struct device *dev = data; |
d72e31c9 | 1442 | struct iommu_group *group; |
d72e31c9 AW |
1443 | |
1444 | /* | |
1445 | * ADD/DEL call into iommu driver ops if provided, which may | |
1446 | * result in ADD/DEL notifiers to group->notifier | |
1447 | */ | |
1448 | if (action == BUS_NOTIFY_ADD_DEVICE) { | |
cc5aed44 | 1449 | int ret; |
3ba8775f | 1450 | |
cc5aed44 JR |
1451 | ret = iommu_probe_device(dev); |
1452 | return (ret) ? NOTIFY_DONE : NOTIFY_OK; | |
843cb6dc | 1453 | } else if (action == BUS_NOTIFY_REMOVED_DEVICE) { |
cc5aed44 JR |
1454 | iommu_release_device(dev); |
1455 | return NOTIFY_OK; | |
d72e31c9 | 1456 | } |
1460432c | 1457 | |
d72e31c9 AW |
1458 | /* |
1459 | * Remaining BUS_NOTIFYs get filtered and republished to the | |
1460 | * group, if anyone is listening | |
1461 | */ | |
1462 | group = iommu_group_get(dev); | |
1463 | if (!group) | |
1464 | return 0; | |
1460432c | 1465 | |
d72e31c9 AW |
1466 | switch (action) { |
1467 | case BUS_NOTIFY_BIND_DRIVER: | |
1468 | group_action = IOMMU_GROUP_NOTIFY_BIND_DRIVER; | |
1469 | break; | |
1470 | case BUS_NOTIFY_BOUND_DRIVER: | |
1471 | group_action = IOMMU_GROUP_NOTIFY_BOUND_DRIVER; | |
1472 | break; | |
1473 | case BUS_NOTIFY_UNBIND_DRIVER: | |
1474 | group_action = IOMMU_GROUP_NOTIFY_UNBIND_DRIVER; | |
1475 | break; | |
1476 | case BUS_NOTIFY_UNBOUND_DRIVER: | |
1477 | group_action = IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER; | |
1478 | break; | |
1479 | } | |
1460432c | 1480 | |
d72e31c9 AW |
1481 | if (group_action) |
1482 | blocking_notifier_call_chain(&group->notifier, | |
1483 | group_action, dev); | |
1460432c | 1484 | |
d72e31c9 | 1485 | iommu_group_put(group); |
1460432c AW |
1486 | return 0; |
1487 | } | |
1488 | ||
fb3e3065 | 1489 | static int iommu_bus_init(struct bus_type *bus, const struct iommu_ops *ops) |
ff21776d | 1490 | { |
fb3e3065 MS |
1491 | int err; |
1492 | struct notifier_block *nb; | |
b22f6434 | 1493 | |
fb3e3065 MS |
1494 | nb = kzalloc(sizeof(struct notifier_block), GFP_KERNEL); |
1495 | if (!nb) | |
1496 | return -ENOMEM; | |
1497 | ||
1498 | nb->notifier_call = iommu_bus_notifier; | |
1499 | ||
1500 | err = bus_register_notifier(bus, nb); | |
8da30142 JR |
1501 | if (err) |
1502 | goto out_free; | |
d7da6bdc | 1503 | |
8cec63e5 | 1504 | err = bus_for_each_dev(bus, NULL, NULL, add_iommu_group); |
8da30142 JR |
1505 | if (err) |
1506 | goto out_err; | |
1507 | ||
d7da6bdc HS |
1508 | |
1509 | return 0; | |
8da30142 JR |
1510 | |
1511 | out_err: | |
1512 | /* Clean up */ | |
8cec63e5 | 1513 | bus_for_each_dev(bus, NULL, NULL, remove_iommu_group); |
8da30142 JR |
1514 | bus_unregister_notifier(bus, nb); |
1515 | ||
1516 | out_free: | |
1517 | kfree(nb); | |
1518 | ||
1519 | return err; | |
ff21776d | 1520 | } |
fc2100eb | 1521 | |
ff21776d JR |
1522 | /** |
1523 | * bus_set_iommu - set iommu-callbacks for the bus | |
1524 | * @bus: bus. | |
1525 | * @ops: the callbacks provided by the iommu-driver | |
1526 | * | |
1527 | * This function is called by an iommu driver to set the iommu methods | |
1528 | * used for a particular bus. Drivers for devices on that bus can use | |
1529 | * the iommu-api after these ops are registered. | |
1530 | * This special function is needed because IOMMUs are usually devices on | |
1531 | * the bus itself, so the iommu drivers are not initialized when the bus | |
1532 | * is set up. With this function the iommu-driver can set the iommu-ops | |
1533 | * afterwards. | |
1534 | */ | |
b22f6434 | 1535 | int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops) |
fc2100eb | 1536 | { |
d7da6bdc HS |
1537 | int err; |
1538 | ||
ff21776d JR |
1539 | if (bus->iommu_ops != NULL) |
1540 | return -EBUSY; | |
fc2100eb | 1541 | |
ff21776d JR |
1542 | bus->iommu_ops = ops; |
1543 | ||
1544 | /* Do IOMMU specific setup for this bus-type */ | |
d7da6bdc HS |
1545 | err = iommu_bus_init(bus, ops); |
1546 | if (err) | |
1547 | bus->iommu_ops = NULL; | |
1548 | ||
1549 | return err; | |
fc2100eb | 1550 | } |
ff21776d | 1551 | EXPORT_SYMBOL_GPL(bus_set_iommu); |
fc2100eb | 1552 | |
a1b60c1c | 1553 | bool iommu_present(struct bus_type *bus) |
fc2100eb | 1554 | { |
94441c3b | 1555 | return bus->iommu_ops != NULL; |
fc2100eb | 1556 | } |
a1b60c1c | 1557 | EXPORT_SYMBOL_GPL(iommu_present); |
fc2100eb | 1558 | |
3c0e0ca0 JR |
1559 | bool iommu_capable(struct bus_type *bus, enum iommu_cap cap) |
1560 | { | |
1561 | if (!bus->iommu_ops || !bus->iommu_ops->capable) | |
1562 | return false; | |
1563 | ||
1564 | return bus->iommu_ops->capable(cap); | |
1565 | } | |
1566 | EXPORT_SYMBOL_GPL(iommu_capable); | |
1567 | ||
4f3f8d9d OBC |
1568 | /** |
1569 | * iommu_set_fault_handler() - set a fault handler for an iommu domain | |
1570 | * @domain: iommu domain | |
1571 | * @handler: fault handler | |
77ca2332 | 1572 | * @token: user data, will be passed back to the fault handler |
0ed6d2d2 OBC |
1573 | * |
1574 | * This function should be used by IOMMU users which want to be notified | |
1575 | * whenever an IOMMU fault happens. | |
1576 | * | |
1577 | * The fault handler itself should return 0 on success, and an appropriate | |
1578 | * error code otherwise. | |
4f3f8d9d OBC |
1579 | */ |
1580 | void iommu_set_fault_handler(struct iommu_domain *domain, | |
77ca2332 OBC |
1581 | iommu_fault_handler_t handler, |
1582 | void *token) | |
4f3f8d9d OBC |
1583 | { |
1584 | BUG_ON(!domain); | |
1585 | ||
1586 | domain->handler = handler; | |
77ca2332 | 1587 | domain->handler_token = token; |
4f3f8d9d | 1588 | } |
30bd918c | 1589 | EXPORT_SYMBOL_GPL(iommu_set_fault_handler); |
4f3f8d9d | 1590 | |
53723dc5 JR |
1591 | static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus, |
1592 | unsigned type) | |
fc2100eb JR |
1593 | { |
1594 | struct iommu_domain *domain; | |
fc2100eb | 1595 | |
94441c3b | 1596 | if (bus == NULL || bus->iommu_ops == NULL) |
905d66c1 JR |
1597 | return NULL; |
1598 | ||
53723dc5 | 1599 | domain = bus->iommu_ops->domain_alloc(type); |
fc2100eb JR |
1600 | if (!domain) |
1601 | return NULL; | |
1602 | ||
8539c7c1 | 1603 | domain->ops = bus->iommu_ops; |
53723dc5 | 1604 | domain->type = type; |
d16e0faa RM |
1605 | /* Assume all sizes by default; the driver may override this later */ |
1606 | domain->pgsize_bitmap = bus->iommu_ops->pgsize_bitmap; | |
905d66c1 | 1607 | |
fc2100eb | 1608 | return domain; |
fc2100eb | 1609 | } |
fc2100eb | 1610 | |
53723dc5 JR |
1611 | struct iommu_domain *iommu_domain_alloc(struct bus_type *bus) |
1612 | { | |
1613 | return __iommu_domain_alloc(bus, IOMMU_DOMAIN_UNMANAGED); | |
fc2100eb JR |
1614 | } |
1615 | EXPORT_SYMBOL_GPL(iommu_domain_alloc); | |
1616 | ||
1617 | void iommu_domain_free(struct iommu_domain *domain) | |
1618 | { | |
89be34a1 | 1619 | domain->ops->domain_free(domain); |
fc2100eb JR |
1620 | } |
1621 | EXPORT_SYMBOL_GPL(iommu_domain_free); | |
1622 | ||
426a2738 JR |
1623 | static int __iommu_attach_device(struct iommu_domain *domain, |
1624 | struct device *dev) | |
fc2100eb | 1625 | { |
b54db778 | 1626 | int ret; |
e01d1913 BH |
1627 | if ((domain->ops->is_attach_deferred != NULL) && |
1628 | domain->ops->is_attach_deferred(domain, dev)) | |
1629 | return 0; | |
1630 | ||
e5aa7f00 JR |
1631 | if (unlikely(domain->ops->attach_dev == NULL)) |
1632 | return -ENODEV; | |
1633 | ||
b54db778 SK |
1634 | ret = domain->ops->attach_dev(domain, dev); |
1635 | if (!ret) | |
1636 | trace_attach_device_to_domain(dev); | |
1637 | return ret; | |
fc2100eb | 1638 | } |
426a2738 JR |
1639 | |
1640 | int iommu_attach_device(struct iommu_domain *domain, struct device *dev) | |
1641 | { | |
1642 | struct iommu_group *group; | |
1643 | int ret; | |
1644 | ||
1645 | group = iommu_group_get(dev); | |
9ae9df03 JC |
1646 | if (!group) |
1647 | return -ENODEV; | |
1648 | ||
426a2738 | 1649 | /* |
05f80300 | 1650 | * Lock the group to make sure the device-count doesn't |
426a2738 JR |
1651 | * change while we are attaching |
1652 | */ | |
1653 | mutex_lock(&group->mutex); | |
1654 | ret = -EINVAL; | |
1655 | if (iommu_group_device_count(group) != 1) | |
1656 | goto out_unlock; | |
1657 | ||
e39cb8a3 | 1658 | ret = __iommu_attach_group(domain, group); |
426a2738 JR |
1659 | |
1660 | out_unlock: | |
1661 | mutex_unlock(&group->mutex); | |
1662 | iommu_group_put(group); | |
1663 | ||
1664 | return ret; | |
1665 | } | |
fc2100eb JR |
1666 | EXPORT_SYMBOL_GPL(iommu_attach_device); |
1667 | ||
426a2738 JR |
1668 | static void __iommu_detach_device(struct iommu_domain *domain, |
1669 | struct device *dev) | |
fc2100eb | 1670 | { |
e01d1913 BH |
1671 | if ((domain->ops->is_attach_deferred != NULL) && |
1672 | domain->ops->is_attach_deferred(domain, dev)) | |
1673 | return; | |
1674 | ||
e5aa7f00 JR |
1675 | if (unlikely(domain->ops->detach_dev == NULL)) |
1676 | return; | |
1677 | ||
1678 | domain->ops->detach_dev(domain, dev); | |
69980630 | 1679 | trace_detach_device_from_domain(dev); |
fc2100eb | 1680 | } |
426a2738 JR |
1681 | |
1682 | void iommu_detach_device(struct iommu_domain *domain, struct device *dev) | |
1683 | { | |
1684 | struct iommu_group *group; | |
1685 | ||
1686 | group = iommu_group_get(dev); | |
9ae9df03 JC |
1687 | if (!group) |
1688 | return; | |
426a2738 JR |
1689 | |
1690 | mutex_lock(&group->mutex); | |
1691 | if (iommu_group_device_count(group) != 1) { | |
1692 | WARN_ON(1); | |
1693 | goto out_unlock; | |
1694 | } | |
1695 | ||
e39cb8a3 | 1696 | __iommu_detach_group(domain, group); |
426a2738 JR |
1697 | |
1698 | out_unlock: | |
1699 | mutex_unlock(&group->mutex); | |
1700 | iommu_group_put(group); | |
1701 | } | |
fc2100eb JR |
1702 | EXPORT_SYMBOL_GPL(iommu_detach_device); |
1703 | ||
2c1296d9 JR |
1704 | struct iommu_domain *iommu_get_domain_for_dev(struct device *dev) |
1705 | { | |
1706 | struct iommu_domain *domain; | |
1707 | struct iommu_group *group; | |
1708 | ||
1709 | group = iommu_group_get(dev); | |
1464d0b1 | 1710 | if (!group) |
2c1296d9 JR |
1711 | return NULL; |
1712 | ||
1713 | domain = group->domain; | |
1714 | ||
1715 | iommu_group_put(group); | |
1716 | ||
1717 | return domain; | |
1718 | } | |
1719 | EXPORT_SYMBOL_GPL(iommu_get_domain_for_dev); | |
fc2100eb | 1720 | |
d72e31c9 | 1721 | /* |
6af588fe RM |
1722 | * For IOMMU_DOMAIN_DMA implementations which already provide their own |
1723 | * guarantees that the group and its default domain are valid and correct. | |
1724 | */ | |
1725 | struct iommu_domain *iommu_get_dma_domain(struct device *dev) | |
1726 | { | |
1727 | return dev->iommu_group->default_domain; | |
1728 | } | |
1729 | ||
d72e31c9 | 1730 | /* |
35449adc | 1731 | * IOMMU groups are really the natural working unit of the IOMMU, but |
d72e31c9 AW |
1732 | * the IOMMU API works on domains and devices. Bridge that gap by |
1733 | * iterating over the devices in a group. Ideally we'd have a single | |
1734 | * device which represents the requestor ID of the group, but we also | |
1735 | * allow IOMMU drivers to create policy defined minimum sets, where | |
1736 | * the physical hardware may be able to distiguish members, but we | |
1737 | * wish to group them at a higher level (ex. untrusted multi-function | |
1738 | * PCI devices). Thus we attach each device. | |
1739 | */ | |
1740 | static int iommu_group_do_attach_device(struct device *dev, void *data) | |
1741 | { | |
1742 | struct iommu_domain *domain = data; | |
1743 | ||
426a2738 | 1744 | return __iommu_attach_device(domain, dev); |
d72e31c9 AW |
1745 | } |
1746 | ||
e39cb8a3 JR |
1747 | static int __iommu_attach_group(struct iommu_domain *domain, |
1748 | struct iommu_group *group) | |
1749 | { | |
1750 | int ret; | |
1751 | ||
1752 | if (group->default_domain && group->domain != group->default_domain) | |
1753 | return -EBUSY; | |
1754 | ||
1755 | ret = __iommu_group_for_each_dev(group, domain, | |
1756 | iommu_group_do_attach_device); | |
1757 | if (ret == 0) | |
1758 | group->domain = domain; | |
1759 | ||
1760 | return ret; | |
d72e31c9 AW |
1761 | } |
1762 | ||
1763 | int iommu_attach_group(struct iommu_domain *domain, struct iommu_group *group) | |
1764 | { | |
e39cb8a3 JR |
1765 | int ret; |
1766 | ||
1767 | mutex_lock(&group->mutex); | |
1768 | ret = __iommu_attach_group(domain, group); | |
1769 | mutex_unlock(&group->mutex); | |
1770 | ||
1771 | return ret; | |
d72e31c9 AW |
1772 | } |
1773 | EXPORT_SYMBOL_GPL(iommu_attach_group); | |
1774 | ||
1775 | static int iommu_group_do_detach_device(struct device *dev, void *data) | |
1776 | { | |
1777 | struct iommu_domain *domain = data; | |
1778 | ||
426a2738 | 1779 | __iommu_detach_device(domain, dev); |
d72e31c9 AW |
1780 | |
1781 | return 0; | |
1782 | } | |
1783 | ||
e39cb8a3 JR |
1784 | static void __iommu_detach_group(struct iommu_domain *domain, |
1785 | struct iommu_group *group) | |
1786 | { | |
1787 | int ret; | |
1788 | ||
1789 | if (!group->default_domain) { | |
1790 | __iommu_group_for_each_dev(group, domain, | |
1791 | iommu_group_do_detach_device); | |
1792 | group->domain = NULL; | |
1793 | return; | |
1794 | } | |
1795 | ||
1796 | if (group->domain == group->default_domain) | |
1797 | return; | |
1798 | ||
1799 | /* Detach by re-attaching to the default domain */ | |
1800 | ret = __iommu_group_for_each_dev(group, group->default_domain, | |
1801 | iommu_group_do_attach_device); | |
1802 | if (ret != 0) | |
1803 | WARN_ON(1); | |
1804 | else | |
1805 | group->domain = group->default_domain; | |
1806 | } | |
1807 | ||
d72e31c9 AW |
1808 | void iommu_detach_group(struct iommu_domain *domain, struct iommu_group *group) |
1809 | { | |
e39cb8a3 JR |
1810 | mutex_lock(&group->mutex); |
1811 | __iommu_detach_group(domain, group); | |
1812 | mutex_unlock(&group->mutex); | |
d72e31c9 AW |
1813 | } |
1814 | EXPORT_SYMBOL_GPL(iommu_detach_group); | |
1815 | ||
bb5547ac | 1816 | phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova) |
fc2100eb | 1817 | { |
e5aa7f00 JR |
1818 | if (unlikely(domain->ops->iova_to_phys == NULL)) |
1819 | return 0; | |
1820 | ||
1821 | return domain->ops->iova_to_phys(domain, iova); | |
fc2100eb JR |
1822 | } |
1823 | EXPORT_SYMBOL_GPL(iommu_iova_to_phys); | |
dbb9fd86 | 1824 | |
bd13969b AW |
1825 | static size_t iommu_pgsize(struct iommu_domain *domain, |
1826 | unsigned long addr_merge, size_t size) | |
1827 | { | |
1828 | unsigned int pgsize_idx; | |
1829 | size_t pgsize; | |
1830 | ||
1831 | /* Max page size that still fits into 'size' */ | |
1832 | pgsize_idx = __fls(size); | |
1833 | ||
1834 | /* need to consider alignment requirements ? */ | |
1835 | if (likely(addr_merge)) { | |
1836 | /* Max page size allowed by address */ | |
1837 | unsigned int align_pgsize_idx = __ffs(addr_merge); | |
1838 | pgsize_idx = min(pgsize_idx, align_pgsize_idx); | |
1839 | } | |
1840 | ||
1841 | /* build a mask of acceptable page sizes */ | |
1842 | pgsize = (1UL << (pgsize_idx + 1)) - 1; | |
1843 | ||
1844 | /* throw away page sizes not supported by the hardware */ | |
d16e0faa | 1845 | pgsize &= domain->pgsize_bitmap; |
bd13969b AW |
1846 | |
1847 | /* make sure we're still sane */ | |
1848 | BUG_ON(!pgsize); | |
1849 | ||
1850 | /* pick the biggest page */ | |
1851 | pgsize_idx = __fls(pgsize); | |
1852 | pgsize = 1UL << pgsize_idx; | |
1853 | ||
1854 | return pgsize; | |
1855 | } | |
1856 | ||
781ca2de TM |
1857 | int __iommu_map(struct iommu_domain *domain, unsigned long iova, |
1858 | phys_addr_t paddr, size_t size, int prot, gfp_t gfp) | |
cefc53c7 | 1859 | { |
1d7ae53b | 1860 | const struct iommu_ops *ops = domain->ops; |
7d3002cc OBC |
1861 | unsigned long orig_iova = iova; |
1862 | unsigned int min_pagesz; | |
1863 | size_t orig_size = size; | |
06bfcaa9 | 1864 | phys_addr_t orig_paddr = paddr; |
7d3002cc | 1865 | int ret = 0; |
cefc53c7 | 1866 | |
1d7ae53b | 1867 | if (unlikely(ops->map == NULL || |
d16e0faa | 1868 | domain->pgsize_bitmap == 0UL)) |
e5aa7f00 | 1869 | return -ENODEV; |
cefc53c7 | 1870 | |
a10315e5 JR |
1871 | if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING))) |
1872 | return -EINVAL; | |
1873 | ||
7d3002cc | 1874 | /* find out the minimum page size supported */ |
d16e0faa | 1875 | min_pagesz = 1 << __ffs(domain->pgsize_bitmap); |
7d3002cc OBC |
1876 | |
1877 | /* | |
1878 | * both the virtual address and the physical one, as well as | |
1879 | * the size of the mapping, must be aligned (at least) to the | |
1880 | * size of the smallest page supported by the hardware | |
1881 | */ | |
1882 | if (!IS_ALIGNED(iova | paddr | size, min_pagesz)) { | |
abedb049 | 1883 | pr_err("unaligned: iova 0x%lx pa %pa size 0x%zx min_pagesz 0x%x\n", |
6197ca82 | 1884 | iova, &paddr, size, min_pagesz); |
7d3002cc OBC |
1885 | return -EINVAL; |
1886 | } | |
1887 | ||
abedb049 | 1888 | pr_debug("map: iova 0x%lx pa %pa size 0x%zx\n", iova, &paddr, size); |
7d3002cc OBC |
1889 | |
1890 | while (size) { | |
bd13969b | 1891 | size_t pgsize = iommu_pgsize(domain, iova | paddr, size); |
7d3002cc | 1892 | |
abedb049 | 1893 | pr_debug("mapping: iova 0x%lx pa %pa pgsize 0x%zx\n", |
6197ca82 | 1894 | iova, &paddr, pgsize); |
781ca2de | 1895 | ret = ops->map(domain, iova, paddr, pgsize, prot, gfp); |
7d3002cc | 1896 | |
7d3002cc OBC |
1897 | if (ret) |
1898 | break; | |
1899 | ||
1900 | iova += pgsize; | |
1901 | paddr += pgsize; | |
1902 | size -= pgsize; | |
1903 | } | |
1904 | ||
1d7ae53b DO |
1905 | if (ops->iotlb_sync_map) |
1906 | ops->iotlb_sync_map(domain); | |
1907 | ||
7d3002cc OBC |
1908 | /* unroll mapping in case something went wrong */ |
1909 | if (ret) | |
1910 | iommu_unmap(domain, orig_iova, orig_size - size); | |
e0be7c86 | 1911 | else |
06bfcaa9 | 1912 | trace_map(orig_iova, orig_paddr, orig_size); |
7d3002cc OBC |
1913 | |
1914 | return ret; | |
cefc53c7 | 1915 | } |
781ca2de TM |
1916 | |
1917 | int iommu_map(struct iommu_domain *domain, unsigned long iova, | |
1918 | phys_addr_t paddr, size_t size, int prot) | |
1919 | { | |
1920 | might_sleep(); | |
1921 | return __iommu_map(domain, iova, paddr, size, prot, GFP_KERNEL); | |
1922 | } | |
cefc53c7 JR |
1923 | EXPORT_SYMBOL_GPL(iommu_map); |
1924 | ||
781ca2de TM |
1925 | int iommu_map_atomic(struct iommu_domain *domain, unsigned long iova, |
1926 | phys_addr_t paddr, size_t size, int prot) | |
1927 | { | |
1928 | return __iommu_map(domain, iova, paddr, size, prot, GFP_ATOMIC); | |
1929 | } | |
1930 | EXPORT_SYMBOL_GPL(iommu_map_atomic); | |
1931 | ||
add02cfd JR |
1932 | static size_t __iommu_unmap(struct iommu_domain *domain, |
1933 | unsigned long iova, size_t size, | |
a7d20dc1 | 1934 | struct iommu_iotlb_gather *iotlb_gather) |
cefc53c7 | 1935 | { |
add02cfd | 1936 | const struct iommu_ops *ops = domain->ops; |
7d3002cc | 1937 | size_t unmapped_page, unmapped = 0; |
6fd492fd | 1938 | unsigned long orig_iova = iova; |
add02cfd | 1939 | unsigned int min_pagesz; |
cefc53c7 | 1940 | |
add02cfd | 1941 | if (unlikely(ops->unmap == NULL || |
d16e0faa | 1942 | domain->pgsize_bitmap == 0UL)) |
c5611a87 | 1943 | return 0; |
e5aa7f00 | 1944 | |
a10315e5 | 1945 | if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING))) |
c5611a87 | 1946 | return 0; |
a10315e5 | 1947 | |
7d3002cc | 1948 | /* find out the minimum page size supported */ |
d16e0faa | 1949 | min_pagesz = 1 << __ffs(domain->pgsize_bitmap); |
7d3002cc OBC |
1950 | |
1951 | /* | |
1952 | * The virtual address, as well as the size of the mapping, must be | |
1953 | * aligned (at least) to the size of the smallest page supported | |
1954 | * by the hardware | |
1955 | */ | |
1956 | if (!IS_ALIGNED(iova | size, min_pagesz)) { | |
6197ca82 JP |
1957 | pr_err("unaligned: iova 0x%lx size 0x%zx min_pagesz 0x%x\n", |
1958 | iova, size, min_pagesz); | |
c5611a87 | 1959 | return 0; |
7d3002cc OBC |
1960 | } |
1961 | ||
6197ca82 | 1962 | pr_debug("unmap this: iova 0x%lx size 0x%zx\n", iova, size); |
7d3002cc OBC |
1963 | |
1964 | /* | |
1965 | * Keep iterating until we either unmap 'size' bytes (or more) | |
1966 | * or we hit an area that isn't mapped. | |
1967 | */ | |
1968 | while (unmapped < size) { | |
bd13969b | 1969 | size_t pgsize = iommu_pgsize(domain, iova, size - unmapped); |
7d3002cc | 1970 | |
56f8af5e | 1971 | unmapped_page = ops->unmap(domain, iova, pgsize, iotlb_gather); |
7d3002cc OBC |
1972 | if (!unmapped_page) |
1973 | break; | |
1974 | ||
6197ca82 JP |
1975 | pr_debug("unmapped: iova 0x%lx size 0x%zx\n", |
1976 | iova, unmapped_page); | |
7d3002cc OBC |
1977 | |
1978 | iova += unmapped_page; | |
1979 | unmapped += unmapped_page; | |
1980 | } | |
1981 | ||
db8614d3 | 1982 | trace_unmap(orig_iova, size, unmapped); |
7d3002cc | 1983 | return unmapped; |
cefc53c7 | 1984 | } |
add02cfd JR |
1985 | |
1986 | size_t iommu_unmap(struct iommu_domain *domain, | |
1987 | unsigned long iova, size_t size) | |
1988 | { | |
a7d20dc1 WD |
1989 | struct iommu_iotlb_gather iotlb_gather; |
1990 | size_t ret; | |
1991 | ||
1992 | iommu_iotlb_gather_init(&iotlb_gather); | |
1993 | ret = __iommu_unmap(domain, iova, size, &iotlb_gather); | |
1994 | iommu_tlb_sync(domain, &iotlb_gather); | |
1995 | ||
1996 | return ret; | |
add02cfd | 1997 | } |
cefc53c7 | 1998 | EXPORT_SYMBOL_GPL(iommu_unmap); |
1460432c | 1999 | |
add02cfd | 2000 | size_t iommu_unmap_fast(struct iommu_domain *domain, |
a7d20dc1 WD |
2001 | unsigned long iova, size_t size, |
2002 | struct iommu_iotlb_gather *iotlb_gather) | |
add02cfd | 2003 | { |
a7d20dc1 | 2004 | return __iommu_unmap(domain, iova, size, iotlb_gather); |
add02cfd JR |
2005 | } |
2006 | EXPORT_SYMBOL_GPL(iommu_unmap_fast); | |
2007 | ||
781ca2de TM |
2008 | size_t __iommu_map_sg(struct iommu_domain *domain, unsigned long iova, |
2009 | struct scatterlist *sg, unsigned int nents, int prot, | |
2010 | gfp_t gfp) | |
315786eb | 2011 | { |
5d95f40e RM |
2012 | size_t len = 0, mapped = 0; |
2013 | phys_addr_t start; | |
2014 | unsigned int i = 0; | |
38ec010d | 2015 | int ret; |
315786eb | 2016 | |
5d95f40e RM |
2017 | while (i <= nents) { |
2018 | phys_addr_t s_phys = sg_phys(sg); | |
18f23409 | 2019 | |
5d95f40e | 2020 | if (len && s_phys != start + len) { |
781ca2de TM |
2021 | ret = __iommu_map(domain, iova + mapped, start, |
2022 | len, prot, gfp); | |
2023 | ||
5d95f40e RM |
2024 | if (ret) |
2025 | goto out_err; | |
18f23409 | 2026 | |
5d95f40e RM |
2027 | mapped += len; |
2028 | len = 0; | |
2029 | } | |
38ec010d | 2030 | |
5d95f40e RM |
2031 | if (len) { |
2032 | len += sg->length; | |
2033 | } else { | |
2034 | len = sg->length; | |
2035 | start = s_phys; | |
2036 | } | |
38ec010d | 2037 | |
5d95f40e RM |
2038 | if (++i < nents) |
2039 | sg = sg_next(sg); | |
315786eb OH |
2040 | } |
2041 | ||
2042 | return mapped; | |
38ec010d JR |
2043 | |
2044 | out_err: | |
2045 | /* undo mappings already done */ | |
2046 | iommu_unmap(domain, iova, mapped); | |
2047 | ||
2048 | return 0; | |
2049 | ||
315786eb | 2050 | } |
781ca2de TM |
2051 | |
2052 | size_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova, | |
2053 | struct scatterlist *sg, unsigned int nents, int prot) | |
2054 | { | |
2055 | might_sleep(); | |
2056 | return __iommu_map_sg(domain, iova, sg, nents, prot, GFP_KERNEL); | |
2057 | } | |
d88e61fa | 2058 | EXPORT_SYMBOL_GPL(iommu_map_sg); |
d7787d57 | 2059 | |
781ca2de TM |
2060 | size_t iommu_map_sg_atomic(struct iommu_domain *domain, unsigned long iova, |
2061 | struct scatterlist *sg, unsigned int nents, int prot) | |
2062 | { | |
2063 | return __iommu_map_sg(domain, iova, sg, nents, prot, GFP_ATOMIC); | |
2064 | } | |
2065 | EXPORT_SYMBOL_GPL(iommu_map_sg_atomic); | |
2066 | ||
d7787d57 | 2067 | int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr, |
80f97f0f | 2068 | phys_addr_t paddr, u64 size, int prot) |
d7787d57 JR |
2069 | { |
2070 | if (unlikely(domain->ops->domain_window_enable == NULL)) | |
2071 | return -ENODEV; | |
2072 | ||
80f97f0f VS |
2073 | return domain->ops->domain_window_enable(domain, wnd_nr, paddr, size, |
2074 | prot); | |
d7787d57 JR |
2075 | } |
2076 | EXPORT_SYMBOL_GPL(iommu_domain_window_enable); | |
2077 | ||
2078 | void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr) | |
2079 | { | |
2080 | if (unlikely(domain->ops->domain_window_disable == NULL)) | |
2081 | return; | |
2082 | ||
2083 | return domain->ops->domain_window_disable(domain, wnd_nr); | |
2084 | } | |
2085 | EXPORT_SYMBOL_GPL(iommu_domain_window_disable); | |
2086 | ||
207c6e36 JR |
2087 | /** |
2088 | * report_iommu_fault() - report about an IOMMU fault to the IOMMU framework | |
2089 | * @domain: the iommu domain where the fault has happened | |
2090 | * @dev: the device where the fault has happened | |
2091 | * @iova: the faulting address | |
2092 | * @flags: mmu fault flags (e.g. IOMMU_FAULT_READ/IOMMU_FAULT_WRITE/...) | |
2093 | * | |
2094 | * This function should be called by the low-level IOMMU implementations | |
2095 | * whenever IOMMU faults happen, to allow high-level users, that are | |
2096 | * interested in such events, to know about them. | |
2097 | * | |
2098 | * This event may be useful for several possible use cases: | |
2099 | * - mere logging of the event | |
2100 | * - dynamic TLB/PTE loading | |
2101 | * - if restarting of the faulting device is required | |
2102 | * | |
2103 | * Returns 0 on success and an appropriate error code otherwise (if dynamic | |
2104 | * PTE/TLB loading will one day be supported, implementations will be able | |
2105 | * to tell whether it succeeded or not according to this return value). | |
2106 | * | |
2107 | * Specifically, -ENOSYS is returned if a fault handler isn't installed | |
2108 | * (though fault handlers can also return -ENOSYS, in case they want to | |
2109 | * elicit the default behavior of the IOMMU drivers). | |
2110 | */ | |
2111 | int report_iommu_fault(struct iommu_domain *domain, struct device *dev, | |
2112 | unsigned long iova, int flags) | |
2113 | { | |
2114 | int ret = -ENOSYS; | |
2115 | ||
2116 | /* | |
2117 | * if upper layers showed interest and installed a fault handler, | |
2118 | * invoke it. | |
2119 | */ | |
2120 | if (domain->handler) | |
2121 | ret = domain->handler(domain, dev, iova, flags, | |
2122 | domain->handler_token); | |
2123 | ||
2124 | trace_io_page_fault(dev, iova, flags); | |
2125 | return ret; | |
2126 | } | |
2127 | EXPORT_SYMBOL_GPL(report_iommu_fault); | |
2128 | ||
d72e31c9 | 2129 | static int __init iommu_init(void) |
1460432c | 2130 | { |
d72e31c9 AW |
2131 | iommu_group_kset = kset_create_and_add("iommu_groups", |
2132 | NULL, kernel_kobj); | |
d72e31c9 AW |
2133 | BUG_ON(!iommu_group_kset); |
2134 | ||
bad614b2 GH |
2135 | iommu_debugfs_setup(); |
2136 | ||
d72e31c9 | 2137 | return 0; |
1460432c | 2138 | } |
d7ef9995 | 2139 | core_initcall(iommu_init); |
0cd76dd1 JR |
2140 | |
2141 | int iommu_domain_get_attr(struct iommu_domain *domain, | |
2142 | enum iommu_attr attr, void *data) | |
2143 | { | |
0ff64f80 | 2144 | struct iommu_domain_geometry *geometry; |
d2e12160 | 2145 | bool *paging; |
0ff64f80 JR |
2146 | int ret = 0; |
2147 | ||
2148 | switch (attr) { | |
2149 | case DOMAIN_ATTR_GEOMETRY: | |
2150 | geometry = data; | |
2151 | *geometry = domain->geometry; | |
2152 | ||
d2e12160 JR |
2153 | break; |
2154 | case DOMAIN_ATTR_PAGING: | |
2155 | paging = data; | |
d16e0faa | 2156 | *paging = (domain->pgsize_bitmap != 0UL); |
0ff64f80 JR |
2157 | break; |
2158 | default: | |
2159 | if (!domain->ops->domain_get_attr) | |
2160 | return -EINVAL; | |
0cd76dd1 | 2161 | |
0ff64f80 JR |
2162 | ret = domain->ops->domain_get_attr(domain, attr, data); |
2163 | } | |
2164 | ||
2165 | return ret; | |
0cd76dd1 JR |
2166 | } |
2167 | EXPORT_SYMBOL_GPL(iommu_domain_get_attr); | |
2168 | ||
2169 | int iommu_domain_set_attr(struct iommu_domain *domain, | |
2170 | enum iommu_attr attr, void *data) | |
2171 | { | |
69356712 | 2172 | int ret = 0; |
69356712 JR |
2173 | |
2174 | switch (attr) { | |
69356712 JR |
2175 | default: |
2176 | if (domain->ops->domain_set_attr == NULL) | |
2177 | return -EINVAL; | |
2178 | ||
2179 | ret = domain->ops->domain_set_attr(domain, attr, data); | |
2180 | } | |
2181 | ||
2182 | return ret; | |
1460432c | 2183 | } |
0cd76dd1 | 2184 | EXPORT_SYMBOL_GPL(iommu_domain_set_attr); |
a1015c2b | 2185 | |
e5b5234a | 2186 | void iommu_get_resv_regions(struct device *dev, struct list_head *list) |
a1015c2b JR |
2187 | { |
2188 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
2189 | ||
e5b5234a EA |
2190 | if (ops && ops->get_resv_regions) |
2191 | ops->get_resv_regions(dev, list); | |
a1015c2b JR |
2192 | } |
2193 | ||
e5b5234a | 2194 | void iommu_put_resv_regions(struct device *dev, struct list_head *list) |
a1015c2b JR |
2195 | { |
2196 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
2197 | ||
e5b5234a EA |
2198 | if (ops && ops->put_resv_regions) |
2199 | ops->put_resv_regions(dev, list); | |
a1015c2b | 2200 | } |
d290f1e7 | 2201 | |
2b20cbba | 2202 | struct iommu_resv_region *iommu_alloc_resv_region(phys_addr_t start, |
9d3a4de4 RM |
2203 | size_t length, int prot, |
2204 | enum iommu_resv_type type) | |
2b20cbba EA |
2205 | { |
2206 | struct iommu_resv_region *region; | |
2207 | ||
2208 | region = kzalloc(sizeof(*region), GFP_KERNEL); | |
2209 | if (!region) | |
2210 | return NULL; | |
2211 | ||
2212 | INIT_LIST_HEAD(®ion->list); | |
2213 | region->start = start; | |
2214 | region->length = length; | |
2215 | region->prot = prot; | |
2216 | region->type = type; | |
2217 | return region; | |
a1015c2b | 2218 | } |
d290f1e7 | 2219 | |
7423e017 LB |
2220 | static int |
2221 | request_default_domain_for_dev(struct device *dev, unsigned long type) | |
d290f1e7 | 2222 | { |
7423e017 | 2223 | struct iommu_domain *domain; |
d290f1e7 JR |
2224 | struct iommu_group *group; |
2225 | int ret; | |
2226 | ||
2227 | /* Device must already be in a group before calling this function */ | |
57274ea2 LB |
2228 | group = iommu_group_get(dev); |
2229 | if (!group) | |
2230 | return -EINVAL; | |
d290f1e7 JR |
2231 | |
2232 | mutex_lock(&group->mutex); | |
2233 | ||
d290f1e7 | 2234 | ret = 0; |
7423e017 | 2235 | if (group->default_domain && group->default_domain->type == type) |
d290f1e7 JR |
2236 | goto out; |
2237 | ||
2238 | /* Don't change mappings of existing devices */ | |
2239 | ret = -EBUSY; | |
2240 | if (iommu_group_device_count(group) != 1) | |
2241 | goto out; | |
2242 | ||
d290f1e7 | 2243 | ret = -ENOMEM; |
7423e017 LB |
2244 | domain = __iommu_domain_alloc(dev->bus, type); |
2245 | if (!domain) | |
d290f1e7 JR |
2246 | goto out; |
2247 | ||
2248 | /* Attach the device to the domain */ | |
7423e017 | 2249 | ret = __iommu_attach_group(domain, group); |
d290f1e7 | 2250 | if (ret) { |
7423e017 | 2251 | iommu_domain_free(domain); |
d290f1e7 JR |
2252 | goto out; |
2253 | } | |
2254 | ||
7423e017 LB |
2255 | iommu_group_create_direct_mappings(group, dev); |
2256 | ||
d127bc9b | 2257 | /* Make the domain the default for this group */ |
d290f1e7 JR |
2258 | if (group->default_domain) |
2259 | iommu_domain_free(group->default_domain); | |
7423e017 | 2260 | group->default_domain = domain; |
d290f1e7 | 2261 | |
7423e017 LB |
2262 | dev_info(dev, "Using iommu %s mapping\n", |
2263 | type == IOMMU_DOMAIN_DMA ? "dma" : "direct"); | |
d290f1e7 JR |
2264 | |
2265 | ret = 0; | |
2266 | out: | |
2267 | mutex_unlock(&group->mutex); | |
2268 | iommu_group_put(group); | |
2269 | ||
2270 | return ret; | |
2271 | } | |
57f98d2f | 2272 | |
7423e017 LB |
2273 | /* Request that a device is direct mapped by the IOMMU */ |
2274 | int iommu_request_dm_for_dev(struct device *dev) | |
2275 | { | |
2276 | return request_default_domain_for_dev(dev, IOMMU_DOMAIN_IDENTITY); | |
2277 | } | |
2278 | ||
2279 | /* Request that a device can't be direct mapped by the IOMMU */ | |
2280 | int iommu_request_dma_domain_for_dev(struct device *dev) | |
2281 | { | |
2282 | return request_default_domain_for_dev(dev, IOMMU_DOMAIN_DMA); | |
2283 | } | |
2284 | ||
8a69961c JR |
2285 | void iommu_set_default_passthrough(bool cmd_line) |
2286 | { | |
2287 | if (cmd_line) | |
2288 | iommu_set_cmd_line_dma_api(); | |
2289 | ||
2290 | iommu_def_domain_type = IOMMU_DOMAIN_IDENTITY; | |
2291 | } | |
2292 | ||
2293 | void iommu_set_default_translated(bool cmd_line) | |
2294 | { | |
2295 | if (cmd_line) | |
2296 | iommu_set_cmd_line_dma_api(); | |
2297 | ||
2298 | iommu_def_domain_type = IOMMU_DOMAIN_DMA; | |
2299 | } | |
2300 | ||
2301 | bool iommu_default_passthrough(void) | |
2302 | { | |
2303 | return iommu_def_domain_type == IOMMU_DOMAIN_IDENTITY; | |
2304 | } | |
2305 | EXPORT_SYMBOL_GPL(iommu_default_passthrough); | |
2306 | ||
534766df | 2307 | const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode) |
e4f10ffe | 2308 | { |
e4f10ffe | 2309 | const struct iommu_ops *ops = NULL; |
d0f6f583 | 2310 | struct iommu_device *iommu; |
e4f10ffe | 2311 | |
d0f6f583 JR |
2312 | spin_lock(&iommu_device_lock); |
2313 | list_for_each_entry(iommu, &iommu_device_list, list) | |
2314 | if (iommu->fwnode == fwnode) { | |
2315 | ops = iommu->ops; | |
e4f10ffe LP |
2316 | break; |
2317 | } | |
d0f6f583 | 2318 | spin_unlock(&iommu_device_lock); |
e4f10ffe LP |
2319 | return ops; |
2320 | } | |
2321 | ||
57f98d2f RM |
2322 | int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode, |
2323 | const struct iommu_ops *ops) | |
2324 | { | |
b4ef725e | 2325 | struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); |
57f98d2f RM |
2326 | |
2327 | if (fwspec) | |
2328 | return ops == fwspec->ops ? 0 : -EINVAL; | |
2329 | ||
2330 | fwspec = kzalloc(sizeof(*fwspec), GFP_KERNEL); | |
2331 | if (!fwspec) | |
2332 | return -ENOMEM; | |
2333 | ||
2334 | of_node_get(to_of_node(iommu_fwnode)); | |
2335 | fwspec->iommu_fwnode = iommu_fwnode; | |
2336 | fwspec->ops = ops; | |
b4ef725e | 2337 | dev_iommu_fwspec_set(dev, fwspec); |
57f98d2f RM |
2338 | return 0; |
2339 | } | |
2340 | EXPORT_SYMBOL_GPL(iommu_fwspec_init); | |
2341 | ||
2342 | void iommu_fwspec_free(struct device *dev) | |
2343 | { | |
b4ef725e | 2344 | struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); |
57f98d2f RM |
2345 | |
2346 | if (fwspec) { | |
2347 | fwnode_handle_put(fwspec->iommu_fwnode); | |
2348 | kfree(fwspec); | |
b4ef725e | 2349 | dev_iommu_fwspec_set(dev, NULL); |
57f98d2f RM |
2350 | } |
2351 | } | |
2352 | EXPORT_SYMBOL_GPL(iommu_fwspec_free); | |
2353 | ||
2354 | int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids) | |
2355 | { | |
b4ef725e | 2356 | struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); |
57f98d2f RM |
2357 | size_t size; |
2358 | int i; | |
2359 | ||
2360 | if (!fwspec) | |
2361 | return -EINVAL; | |
2362 | ||
2363 | size = offsetof(struct iommu_fwspec, ids[fwspec->num_ids + num_ids]); | |
2364 | if (size > sizeof(*fwspec)) { | |
b4ef725e | 2365 | fwspec = krealloc(fwspec, size, GFP_KERNEL); |
57f98d2f RM |
2366 | if (!fwspec) |
2367 | return -ENOMEM; | |
909111ba | 2368 | |
b4ef725e | 2369 | dev_iommu_fwspec_set(dev, fwspec); |
57f98d2f RM |
2370 | } |
2371 | ||
2372 | for (i = 0; i < num_ids; i++) | |
2373 | fwspec->ids[fwspec->num_ids + i] = ids[i]; | |
2374 | ||
2375 | fwspec->num_ids += num_ids; | |
57f98d2f RM |
2376 | return 0; |
2377 | } | |
2378 | EXPORT_SYMBOL_GPL(iommu_fwspec_add_ids); | |
a3a19592 LB |
2379 | |
2380 | /* | |
2381 | * Per device IOMMU features. | |
2382 | */ | |
2383 | bool iommu_dev_has_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_has_feat) | |
2388 | return ops->dev_has_feat(dev, feat); | |
2389 | ||
2390 | return false; | |
2391 | } | |
2392 | EXPORT_SYMBOL_GPL(iommu_dev_has_feature); | |
2393 | ||
2394 | int iommu_dev_enable_feature(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_enable_feat) | |
2399 | return ops->dev_enable_feat(dev, feat); | |
2400 | ||
2401 | return -ENODEV; | |
2402 | } | |
2403 | EXPORT_SYMBOL_GPL(iommu_dev_enable_feature); | |
2404 | ||
2405 | /* | |
2406 | * The device drivers should do the necessary cleanups before calling this. | |
2407 | * For example, before disabling the aux-domain feature, the device driver | |
2408 | * should detach all aux-domains. Otherwise, this will return -EBUSY. | |
2409 | */ | |
2410 | int iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features feat) | |
2411 | { | |
2412 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
2413 | ||
2414 | if (ops && ops->dev_disable_feat) | |
2415 | return ops->dev_disable_feat(dev, feat); | |
2416 | ||
2417 | return -EBUSY; | |
2418 | } | |
2419 | EXPORT_SYMBOL_GPL(iommu_dev_disable_feature); | |
2420 | ||
2421 | bool iommu_dev_feature_enabled(struct device *dev, enum iommu_dev_features feat) | |
2422 | { | |
2423 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
2424 | ||
2425 | if (ops && ops->dev_feat_enabled) | |
2426 | return ops->dev_feat_enabled(dev, feat); | |
2427 | ||
2428 | return false; | |
2429 | } | |
2430 | EXPORT_SYMBOL_GPL(iommu_dev_feature_enabled); | |
2431 | ||
2432 | /* | |
2433 | * Aux-domain specific attach/detach. | |
2434 | * | |
2435 | * Only works if iommu_dev_feature_enabled(dev, IOMMU_DEV_FEAT_AUX) returns | |
2436 | * true. Also, as long as domains are attached to a device through this | |
2437 | * interface, any tries to call iommu_attach_device() should fail | |
2438 | * (iommu_detach_device() can't fail, so we fail when trying to re-attach). | |
2439 | * This should make us safe against a device being attached to a guest as a | |
2440 | * whole while there are still pasid users on it (aux and sva). | |
2441 | */ | |
2442 | int iommu_aux_attach_device(struct iommu_domain *domain, struct device *dev) | |
2443 | { | |
2444 | int ret = -ENODEV; | |
2445 | ||
2446 | if (domain->ops->aux_attach_dev) | |
2447 | ret = domain->ops->aux_attach_dev(domain, dev); | |
2448 | ||
2449 | if (!ret) | |
2450 | trace_attach_device_to_domain(dev); | |
2451 | ||
2452 | return ret; | |
2453 | } | |
2454 | EXPORT_SYMBOL_GPL(iommu_aux_attach_device); | |
2455 | ||
2456 | void iommu_aux_detach_device(struct iommu_domain *domain, struct device *dev) | |
2457 | { | |
2458 | if (domain->ops->aux_detach_dev) { | |
2459 | domain->ops->aux_detach_dev(domain, dev); | |
2460 | trace_detach_device_from_domain(dev); | |
2461 | } | |
2462 | } | |
2463 | EXPORT_SYMBOL_GPL(iommu_aux_detach_device); | |
2464 | ||
2465 | int iommu_aux_get_pasid(struct iommu_domain *domain, struct device *dev) | |
2466 | { | |
2467 | int ret = -ENODEV; | |
2468 | ||
2469 | if (domain->ops->aux_get_pasid) | |
2470 | ret = domain->ops->aux_get_pasid(domain, dev); | |
2471 | ||
2472 | return ret; | |
2473 | } | |
2474 | EXPORT_SYMBOL_GPL(iommu_aux_get_pasid); | |
26b25a2b JPB |
2475 | |
2476 | /** | |
2477 | * iommu_sva_bind_device() - Bind a process address space to a device | |
2478 | * @dev: the device | |
2479 | * @mm: the mm to bind, caller must hold a reference to it | |
2480 | * | |
2481 | * Create a bond between device and address space, allowing the device to access | |
2482 | * the mm using the returned PASID. If a bond already exists between @device and | |
2483 | * @mm, it is returned and an additional reference is taken. Caller must call | |
2484 | * iommu_sva_unbind_device() to release each reference. | |
2485 | * | |
2486 | * iommu_dev_enable_feature(dev, IOMMU_DEV_FEAT_SVA) must be called first, to | |
2487 | * initialize the required SVA features. | |
2488 | * | |
2489 | * On error, returns an ERR_PTR value. | |
2490 | */ | |
2491 | struct iommu_sva * | |
2492 | iommu_sva_bind_device(struct device *dev, struct mm_struct *mm, void *drvdata) | |
2493 | { | |
2494 | struct iommu_group *group; | |
2495 | struct iommu_sva *handle = ERR_PTR(-EINVAL); | |
2496 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
2497 | ||
2498 | if (!ops || !ops->sva_bind) | |
2499 | return ERR_PTR(-ENODEV); | |
2500 | ||
2501 | group = iommu_group_get(dev); | |
2502 | if (!group) | |
2503 | return ERR_PTR(-ENODEV); | |
2504 | ||
2505 | /* Ensure device count and domain don't change while we're binding */ | |
2506 | mutex_lock(&group->mutex); | |
2507 | ||
2508 | /* | |
2509 | * To keep things simple, SVA currently doesn't support IOMMU groups | |
2510 | * with more than one device. Existing SVA-capable systems are not | |
2511 | * affected by the problems that required IOMMU groups (lack of ACS | |
2512 | * isolation, device ID aliasing and other hardware issues). | |
2513 | */ | |
2514 | if (iommu_group_device_count(group) != 1) | |
2515 | goto out_unlock; | |
2516 | ||
2517 | handle = ops->sva_bind(dev, mm, drvdata); | |
2518 | ||
2519 | out_unlock: | |
2520 | mutex_unlock(&group->mutex); | |
2521 | iommu_group_put(group); | |
2522 | ||
2523 | return handle; | |
2524 | } | |
2525 | EXPORT_SYMBOL_GPL(iommu_sva_bind_device); | |
2526 | ||
2527 | /** | |
2528 | * iommu_sva_unbind_device() - Remove a bond created with iommu_sva_bind_device | |
2529 | * @handle: the handle returned by iommu_sva_bind_device() | |
2530 | * | |
2531 | * Put reference to a bond between device and address space. The device should | |
2532 | * not be issuing any more transaction for this PASID. All outstanding page | |
2533 | * requests for this PASID must have been flushed to the IOMMU. | |
2534 | * | |
2535 | * Returns 0 on success, or an error value | |
2536 | */ | |
2537 | void iommu_sva_unbind_device(struct iommu_sva *handle) | |
2538 | { | |
2539 | struct iommu_group *group; | |
2540 | struct device *dev = handle->dev; | |
2541 | const struct iommu_ops *ops = dev->bus->iommu_ops; | |
2542 | ||
2543 | if (!ops || !ops->sva_unbind) | |
2544 | return; | |
2545 | ||
2546 | group = iommu_group_get(dev); | |
2547 | if (!group) | |
2548 | return; | |
2549 | ||
2550 | mutex_lock(&group->mutex); | |
2551 | ops->sva_unbind(handle); | |
2552 | mutex_unlock(&group->mutex); | |
2553 | ||
2554 | iommu_group_put(group); | |
2555 | } | |
2556 | EXPORT_SYMBOL_GPL(iommu_sva_unbind_device); | |
2557 | ||
2558 | int iommu_sva_set_ops(struct iommu_sva *handle, | |
2559 | const struct iommu_sva_ops *sva_ops) | |
2560 | { | |
2561 | if (handle->ops && handle->ops != sva_ops) | |
2562 | return -EEXIST; | |
2563 | ||
2564 | handle->ops = sva_ops; | |
2565 | return 0; | |
2566 | } | |
2567 | EXPORT_SYMBOL_GPL(iommu_sva_set_ops); | |
2568 | ||
2569 | int iommu_sva_get_pasid(struct iommu_sva *handle) | |
2570 | { | |
2571 | const struct iommu_ops *ops = handle->dev->bus->iommu_ops; | |
2572 | ||
2573 | if (!ops || !ops->sva_get_pasid) | |
2574 | return IOMMU_PASID_INVALID; | |
2575 | ||
2576 | return ops->sva_get_pasid(handle); | |
2577 | } | |
2578 | EXPORT_SYMBOL_GPL(iommu_sva_get_pasid); |