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edcd69ab JPB |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Virtio driver for the paravirtualized IOMMU | |
4 | * | |
ae24fb49 | 5 | * Copyright (C) 2019 Arm Limited |
edcd69ab JPB |
6 | */ |
7 | ||
8 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
9 | ||
10 | #include <linux/amba/bus.h> | |
11 | #include <linux/delay.h> | |
12 | #include <linux/dma-iommu.h> | |
13 | #include <linux/freezer.h> | |
14 | #include <linux/interval_tree.h> | |
15 | #include <linux/iommu.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/of_iommu.h> | |
18 | #include <linux/of_platform.h> | |
19 | #include <linux/pci.h> | |
20 | #include <linux/platform_device.h> | |
21 | #include <linux/virtio.h> | |
22 | #include <linux/virtio_config.h> | |
23 | #include <linux/virtio_ids.h> | |
24 | #include <linux/wait.h> | |
25 | ||
26 | #include <uapi/linux/virtio_iommu.h> | |
27 | ||
28 | #define MSI_IOVA_BASE 0x8000000 | |
29 | #define MSI_IOVA_LENGTH 0x100000 | |
30 | ||
31 | #define VIOMMU_REQUEST_VQ 0 | |
169a126c JPB |
32 | #define VIOMMU_EVENT_VQ 1 |
33 | #define VIOMMU_NR_VQS 2 | |
edcd69ab JPB |
34 | |
35 | struct viommu_dev { | |
36 | struct iommu_device iommu; | |
37 | struct device *dev; | |
38 | struct virtio_device *vdev; | |
39 | ||
40 | struct ida domain_ids; | |
41 | ||
42 | struct virtqueue *vqs[VIOMMU_NR_VQS]; | |
43 | spinlock_t request_lock; | |
44 | struct list_head requests; | |
169a126c | 45 | void *evts; |
edcd69ab JPB |
46 | |
47 | /* Device configuration */ | |
48 | struct iommu_domain_geometry geometry; | |
49 | u64 pgsize_bitmap; | |
ae24fb49 JPB |
50 | u32 first_domain; |
51 | u32 last_domain; | |
52 | /* Supported MAP flags */ | |
53 | u32 map_flags; | |
2a5a3148 | 54 | u32 probe_size; |
edcd69ab JPB |
55 | }; |
56 | ||
57 | struct viommu_mapping { | |
58 | phys_addr_t paddr; | |
59 | struct interval_tree_node iova; | |
60 | u32 flags; | |
61 | }; | |
62 | ||
63 | struct viommu_domain { | |
64 | struct iommu_domain domain; | |
65 | struct viommu_dev *viommu; | |
66 | struct mutex mutex; /* protects viommu pointer */ | |
67 | unsigned int id; | |
ae24fb49 | 68 | u32 map_flags; |
edcd69ab JPB |
69 | |
70 | spinlock_t mappings_lock; | |
71 | struct rb_root_cached mappings; | |
72 | ||
73 | unsigned long nr_endpoints; | |
74 | }; | |
75 | ||
76 | struct viommu_endpoint { | |
2a5a3148 | 77 | struct device *dev; |
edcd69ab JPB |
78 | struct viommu_dev *viommu; |
79 | struct viommu_domain *vdomain; | |
2a5a3148 | 80 | struct list_head resv_regions; |
edcd69ab JPB |
81 | }; |
82 | ||
83 | struct viommu_request { | |
84 | struct list_head list; | |
85 | void *writeback; | |
86 | unsigned int write_offset; | |
87 | unsigned int len; | |
88 | char buf[]; | |
89 | }; | |
90 | ||
169a126c JPB |
91 | #define VIOMMU_FAULT_RESV_MASK 0xffffff00 |
92 | ||
93 | struct viommu_event { | |
94 | union { | |
95 | u32 head; | |
96 | struct virtio_iommu_fault fault; | |
97 | }; | |
98 | }; | |
99 | ||
edcd69ab JPB |
100 | #define to_viommu_domain(domain) \ |
101 | container_of(domain, struct viommu_domain, domain) | |
102 | ||
103 | static int viommu_get_req_errno(void *buf, size_t len) | |
104 | { | |
105 | struct virtio_iommu_req_tail *tail = buf + len - sizeof(*tail); | |
106 | ||
107 | switch (tail->status) { | |
108 | case VIRTIO_IOMMU_S_OK: | |
109 | return 0; | |
110 | case VIRTIO_IOMMU_S_UNSUPP: | |
111 | return -ENOSYS; | |
112 | case VIRTIO_IOMMU_S_INVAL: | |
113 | return -EINVAL; | |
114 | case VIRTIO_IOMMU_S_RANGE: | |
115 | return -ERANGE; | |
116 | case VIRTIO_IOMMU_S_NOENT: | |
117 | return -ENOENT; | |
118 | case VIRTIO_IOMMU_S_FAULT: | |
119 | return -EFAULT; | |
ae24fb49 JPB |
120 | case VIRTIO_IOMMU_S_NOMEM: |
121 | return -ENOMEM; | |
edcd69ab JPB |
122 | case VIRTIO_IOMMU_S_IOERR: |
123 | case VIRTIO_IOMMU_S_DEVERR: | |
124 | default: | |
125 | return -EIO; | |
126 | } | |
127 | } | |
128 | ||
129 | static void viommu_set_req_status(void *buf, size_t len, int status) | |
130 | { | |
131 | struct virtio_iommu_req_tail *tail = buf + len - sizeof(*tail); | |
132 | ||
133 | tail->status = status; | |
134 | } | |
135 | ||
136 | static off_t viommu_get_write_desc_offset(struct viommu_dev *viommu, | |
137 | struct virtio_iommu_req_head *req, | |
138 | size_t len) | |
139 | { | |
140 | size_t tail_size = sizeof(struct virtio_iommu_req_tail); | |
141 | ||
2a5a3148 JPB |
142 | if (req->type == VIRTIO_IOMMU_T_PROBE) |
143 | return len - viommu->probe_size - tail_size; | |
144 | ||
edcd69ab JPB |
145 | return len - tail_size; |
146 | } | |
147 | ||
148 | /* | |
149 | * __viommu_sync_req - Complete all in-flight requests | |
150 | * | |
151 | * Wait for all added requests to complete. When this function returns, all | |
152 | * requests that were in-flight at the time of the call have completed. | |
153 | */ | |
154 | static int __viommu_sync_req(struct viommu_dev *viommu) | |
155 | { | |
edcd69ab JPB |
156 | unsigned int len; |
157 | size_t write_len; | |
158 | struct viommu_request *req; | |
159 | struct virtqueue *vq = viommu->vqs[VIOMMU_REQUEST_VQ]; | |
160 | ||
161 | assert_spin_locked(&viommu->request_lock); | |
162 | ||
163 | virtqueue_kick(vq); | |
164 | ||
165 | while (!list_empty(&viommu->requests)) { | |
166 | len = 0; | |
167 | req = virtqueue_get_buf(vq, &len); | |
168 | if (!req) | |
169 | continue; | |
170 | ||
171 | if (!len) | |
172 | viommu_set_req_status(req->buf, req->len, | |
173 | VIRTIO_IOMMU_S_IOERR); | |
174 | ||
175 | write_len = req->len - req->write_offset; | |
176 | if (req->writeback && len == write_len) | |
177 | memcpy(req->writeback, req->buf + req->write_offset, | |
178 | write_len); | |
179 | ||
180 | list_del(&req->list); | |
181 | kfree(req); | |
182 | } | |
183 | ||
c1c8058d | 184 | return 0; |
edcd69ab JPB |
185 | } |
186 | ||
187 | static int viommu_sync_req(struct viommu_dev *viommu) | |
188 | { | |
189 | int ret; | |
190 | unsigned long flags; | |
191 | ||
192 | spin_lock_irqsave(&viommu->request_lock, flags); | |
193 | ret = __viommu_sync_req(viommu); | |
194 | if (ret) | |
195 | dev_dbg(viommu->dev, "could not sync requests (%d)\n", ret); | |
196 | spin_unlock_irqrestore(&viommu->request_lock, flags); | |
197 | ||
198 | return ret; | |
199 | } | |
200 | ||
201 | /* | |
202 | * __viommu_add_request - Add one request to the queue | |
203 | * @buf: pointer to the request buffer | |
204 | * @len: length of the request buffer | |
205 | * @writeback: copy data back to the buffer when the request completes. | |
206 | * | |
207 | * Add a request to the queue. Only synchronize the queue if it's already full. | |
208 | * Otherwise don't kick the queue nor wait for requests to complete. | |
209 | * | |
210 | * When @writeback is true, data written by the device, including the request | |
211 | * status, is copied into @buf after the request completes. This is unsafe if | |
212 | * the caller allocates @buf on stack and drops the lock between add_req() and | |
213 | * sync_req(). | |
214 | * | |
215 | * Return 0 if the request was successfully added to the queue. | |
216 | */ | |
217 | static int __viommu_add_req(struct viommu_dev *viommu, void *buf, size_t len, | |
218 | bool writeback) | |
219 | { | |
220 | int ret; | |
221 | off_t write_offset; | |
222 | struct viommu_request *req; | |
223 | struct scatterlist top_sg, bottom_sg; | |
224 | struct scatterlist *sg[2] = { &top_sg, &bottom_sg }; | |
225 | struct virtqueue *vq = viommu->vqs[VIOMMU_REQUEST_VQ]; | |
226 | ||
227 | assert_spin_locked(&viommu->request_lock); | |
228 | ||
229 | write_offset = viommu_get_write_desc_offset(viommu, buf, len); | |
230 | if (write_offset <= 0) | |
231 | return -EINVAL; | |
232 | ||
233 | req = kzalloc(sizeof(*req) + len, GFP_ATOMIC); | |
234 | if (!req) | |
235 | return -ENOMEM; | |
236 | ||
237 | req->len = len; | |
238 | if (writeback) { | |
239 | req->writeback = buf + write_offset; | |
240 | req->write_offset = write_offset; | |
241 | } | |
242 | memcpy(&req->buf, buf, write_offset); | |
243 | ||
244 | sg_init_one(&top_sg, req->buf, write_offset); | |
245 | sg_init_one(&bottom_sg, req->buf + write_offset, len - write_offset); | |
246 | ||
247 | ret = virtqueue_add_sgs(vq, sg, 1, 1, req, GFP_ATOMIC); | |
248 | if (ret == -ENOSPC) { | |
249 | /* If the queue is full, sync and retry */ | |
250 | if (!__viommu_sync_req(viommu)) | |
251 | ret = virtqueue_add_sgs(vq, sg, 1, 1, req, GFP_ATOMIC); | |
252 | } | |
253 | if (ret) | |
254 | goto err_free; | |
255 | ||
256 | list_add_tail(&req->list, &viommu->requests); | |
257 | return 0; | |
258 | ||
259 | err_free: | |
260 | kfree(req); | |
261 | return ret; | |
262 | } | |
263 | ||
264 | static int viommu_add_req(struct viommu_dev *viommu, void *buf, size_t len) | |
265 | { | |
266 | int ret; | |
267 | unsigned long flags; | |
268 | ||
269 | spin_lock_irqsave(&viommu->request_lock, flags); | |
270 | ret = __viommu_add_req(viommu, buf, len, false); | |
271 | if (ret) | |
272 | dev_dbg(viommu->dev, "could not add request: %d\n", ret); | |
273 | spin_unlock_irqrestore(&viommu->request_lock, flags); | |
274 | ||
275 | return ret; | |
276 | } | |
277 | ||
278 | /* | |
279 | * Send a request and wait for it to complete. Return the request status (as an | |
280 | * errno) | |
281 | */ | |
282 | static int viommu_send_req_sync(struct viommu_dev *viommu, void *buf, | |
283 | size_t len) | |
284 | { | |
285 | int ret; | |
286 | unsigned long flags; | |
287 | ||
288 | spin_lock_irqsave(&viommu->request_lock, flags); | |
289 | ||
290 | ret = __viommu_add_req(viommu, buf, len, true); | |
291 | if (ret) { | |
292 | dev_dbg(viommu->dev, "could not add request (%d)\n", ret); | |
293 | goto out_unlock; | |
294 | } | |
295 | ||
296 | ret = __viommu_sync_req(viommu); | |
297 | if (ret) { | |
298 | dev_dbg(viommu->dev, "could not sync requests (%d)\n", ret); | |
299 | /* Fall-through (get the actual request status) */ | |
300 | } | |
301 | ||
302 | ret = viommu_get_req_errno(buf, len); | |
303 | out_unlock: | |
304 | spin_unlock_irqrestore(&viommu->request_lock, flags); | |
305 | return ret; | |
306 | } | |
307 | ||
308 | /* | |
309 | * viommu_add_mapping - add a mapping to the internal tree | |
310 | * | |
311 | * On success, return the new mapping. Otherwise return NULL. | |
312 | */ | |
313 | static int viommu_add_mapping(struct viommu_domain *vdomain, unsigned long iova, | |
314 | phys_addr_t paddr, size_t size, u32 flags) | |
315 | { | |
316 | unsigned long irqflags; | |
317 | struct viommu_mapping *mapping; | |
318 | ||
319 | mapping = kzalloc(sizeof(*mapping), GFP_ATOMIC); | |
320 | if (!mapping) | |
321 | return -ENOMEM; | |
322 | ||
323 | mapping->paddr = paddr; | |
324 | mapping->iova.start = iova; | |
325 | mapping->iova.last = iova + size - 1; | |
326 | mapping->flags = flags; | |
327 | ||
328 | spin_lock_irqsave(&vdomain->mappings_lock, irqflags); | |
329 | interval_tree_insert(&mapping->iova, &vdomain->mappings); | |
330 | spin_unlock_irqrestore(&vdomain->mappings_lock, irqflags); | |
331 | ||
332 | return 0; | |
333 | } | |
334 | ||
335 | /* | |
336 | * viommu_del_mappings - remove mappings from the internal tree | |
337 | * | |
338 | * @vdomain: the domain | |
339 | * @iova: start of the range | |
340 | * @size: size of the range. A size of 0 corresponds to the entire address | |
341 | * space. | |
342 | * | |
343 | * On success, returns the number of unmapped bytes (>= size) | |
344 | */ | |
345 | static size_t viommu_del_mappings(struct viommu_domain *vdomain, | |
346 | unsigned long iova, size_t size) | |
347 | { | |
348 | size_t unmapped = 0; | |
349 | unsigned long flags; | |
350 | unsigned long last = iova + size - 1; | |
351 | struct viommu_mapping *mapping = NULL; | |
352 | struct interval_tree_node *node, *next; | |
353 | ||
354 | spin_lock_irqsave(&vdomain->mappings_lock, flags); | |
355 | next = interval_tree_iter_first(&vdomain->mappings, iova, last); | |
356 | while (next) { | |
357 | node = next; | |
358 | mapping = container_of(node, struct viommu_mapping, iova); | |
359 | next = interval_tree_iter_next(node, iova, last); | |
360 | ||
361 | /* Trying to split a mapping? */ | |
362 | if (mapping->iova.start < iova) | |
363 | break; | |
364 | ||
365 | /* | |
366 | * Virtio-iommu doesn't allow UNMAP to split a mapping created | |
367 | * with a single MAP request, so remove the full mapping. | |
368 | */ | |
369 | unmapped += mapping->iova.last - mapping->iova.start + 1; | |
370 | ||
371 | interval_tree_remove(node, &vdomain->mappings); | |
372 | kfree(mapping); | |
373 | } | |
374 | spin_unlock_irqrestore(&vdomain->mappings_lock, flags); | |
375 | ||
376 | return unmapped; | |
377 | } | |
378 | ||
379 | /* | |
380 | * viommu_replay_mappings - re-send MAP requests | |
381 | * | |
382 | * When reattaching a domain that was previously detached from all endpoints, | |
383 | * mappings were deleted from the device. Re-create the mappings available in | |
384 | * the internal tree. | |
385 | */ | |
386 | static int viommu_replay_mappings(struct viommu_domain *vdomain) | |
387 | { | |
388 | int ret = 0; | |
389 | unsigned long flags; | |
390 | struct viommu_mapping *mapping; | |
391 | struct interval_tree_node *node; | |
392 | struct virtio_iommu_req_map map; | |
393 | ||
394 | spin_lock_irqsave(&vdomain->mappings_lock, flags); | |
395 | node = interval_tree_iter_first(&vdomain->mappings, 0, -1UL); | |
396 | while (node) { | |
397 | mapping = container_of(node, struct viommu_mapping, iova); | |
398 | map = (struct virtio_iommu_req_map) { | |
399 | .head.type = VIRTIO_IOMMU_T_MAP, | |
400 | .domain = cpu_to_le32(vdomain->id), | |
401 | .virt_start = cpu_to_le64(mapping->iova.start), | |
402 | .virt_end = cpu_to_le64(mapping->iova.last), | |
403 | .phys_start = cpu_to_le64(mapping->paddr), | |
404 | .flags = cpu_to_le32(mapping->flags), | |
405 | }; | |
406 | ||
407 | ret = viommu_send_req_sync(vdomain->viommu, &map, sizeof(map)); | |
408 | if (ret) | |
409 | break; | |
410 | ||
411 | node = interval_tree_iter_next(node, 0, -1UL); | |
412 | } | |
413 | spin_unlock_irqrestore(&vdomain->mappings_lock, flags); | |
414 | ||
415 | return ret; | |
416 | } | |
417 | ||
2a5a3148 JPB |
418 | static int viommu_add_resv_mem(struct viommu_endpoint *vdev, |
419 | struct virtio_iommu_probe_resv_mem *mem, | |
420 | size_t len) | |
421 | { | |
422 | size_t size; | |
423 | u64 start64, end64; | |
424 | phys_addr_t start, end; | |
425 | struct iommu_resv_region *region = NULL; | |
426 | unsigned long prot = IOMMU_WRITE | IOMMU_NOEXEC | IOMMU_MMIO; | |
427 | ||
428 | start = start64 = le64_to_cpu(mem->start); | |
429 | end = end64 = le64_to_cpu(mem->end); | |
430 | size = end64 - start64 + 1; | |
431 | ||
432 | /* Catch any overflow, including the unlikely end64 - start64 + 1 = 0 */ | |
433 | if (start != start64 || end != end64 || size < end64 - start64) | |
434 | return -EOVERFLOW; | |
435 | ||
436 | if (len < sizeof(*mem)) | |
437 | return -EINVAL; | |
438 | ||
439 | switch (mem->subtype) { | |
440 | default: | |
441 | dev_warn(vdev->dev, "unknown resv mem subtype 0x%x\n", | |
442 | mem->subtype); | |
443 | /* Fall-through */ | |
444 | case VIRTIO_IOMMU_RESV_MEM_T_RESERVED: | |
445 | region = iommu_alloc_resv_region(start, size, 0, | |
446 | IOMMU_RESV_RESERVED); | |
447 | break; | |
448 | case VIRTIO_IOMMU_RESV_MEM_T_MSI: | |
449 | region = iommu_alloc_resv_region(start, size, prot, | |
450 | IOMMU_RESV_MSI); | |
451 | break; | |
452 | } | |
453 | if (!region) | |
454 | return -ENOMEM; | |
455 | ||
456 | list_add(&vdev->resv_regions, ®ion->list); | |
457 | return 0; | |
458 | } | |
459 | ||
460 | static int viommu_probe_endpoint(struct viommu_dev *viommu, struct device *dev) | |
461 | { | |
462 | int ret; | |
463 | u16 type, len; | |
464 | size_t cur = 0; | |
465 | size_t probe_len; | |
466 | struct virtio_iommu_req_probe *probe; | |
467 | struct virtio_iommu_probe_property *prop; | |
468 | struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); | |
a4b6c2af | 469 | struct viommu_endpoint *vdev = dev_iommu_priv_get(dev); |
2a5a3148 JPB |
470 | |
471 | if (!fwspec->num_ids) | |
472 | return -EINVAL; | |
473 | ||
474 | probe_len = sizeof(*probe) + viommu->probe_size + | |
475 | sizeof(struct virtio_iommu_req_tail); | |
476 | probe = kzalloc(probe_len, GFP_KERNEL); | |
477 | if (!probe) | |
478 | return -ENOMEM; | |
479 | ||
480 | probe->head.type = VIRTIO_IOMMU_T_PROBE; | |
481 | /* | |
482 | * For now, assume that properties of an endpoint that outputs multiple | |
483 | * IDs are consistent. Only probe the first one. | |
484 | */ | |
485 | probe->endpoint = cpu_to_le32(fwspec->ids[0]); | |
486 | ||
487 | ret = viommu_send_req_sync(viommu, probe, probe_len); | |
488 | if (ret) | |
489 | goto out_free; | |
490 | ||
491 | prop = (void *)probe->properties; | |
492 | type = le16_to_cpu(prop->type) & VIRTIO_IOMMU_PROBE_T_MASK; | |
493 | ||
494 | while (type != VIRTIO_IOMMU_PROBE_T_NONE && | |
495 | cur < viommu->probe_size) { | |
496 | len = le16_to_cpu(prop->length) + sizeof(*prop); | |
497 | ||
498 | switch (type) { | |
499 | case VIRTIO_IOMMU_PROBE_T_RESV_MEM: | |
500 | ret = viommu_add_resv_mem(vdev, (void *)prop, len); | |
501 | break; | |
502 | default: | |
503 | dev_err(dev, "unknown viommu prop 0x%x\n", type); | |
504 | } | |
505 | ||
506 | if (ret) | |
507 | dev_err(dev, "failed to parse viommu prop 0x%x\n", type); | |
508 | ||
509 | cur += len; | |
510 | if (cur >= viommu->probe_size) | |
511 | break; | |
512 | ||
513 | prop = (void *)probe->properties + cur; | |
514 | type = le16_to_cpu(prop->type) & VIRTIO_IOMMU_PROBE_T_MASK; | |
515 | } | |
516 | ||
517 | out_free: | |
518 | kfree(probe); | |
519 | return ret; | |
520 | } | |
521 | ||
169a126c JPB |
522 | static int viommu_fault_handler(struct viommu_dev *viommu, |
523 | struct virtio_iommu_fault *fault) | |
524 | { | |
525 | char *reason_str; | |
526 | ||
527 | u8 reason = fault->reason; | |
528 | u32 flags = le32_to_cpu(fault->flags); | |
529 | u32 endpoint = le32_to_cpu(fault->endpoint); | |
530 | u64 address = le64_to_cpu(fault->address); | |
531 | ||
532 | switch (reason) { | |
533 | case VIRTIO_IOMMU_FAULT_R_DOMAIN: | |
534 | reason_str = "domain"; | |
535 | break; | |
536 | case VIRTIO_IOMMU_FAULT_R_MAPPING: | |
537 | reason_str = "page"; | |
538 | break; | |
539 | case VIRTIO_IOMMU_FAULT_R_UNKNOWN: | |
540 | default: | |
541 | reason_str = "unknown"; | |
542 | break; | |
543 | } | |
544 | ||
545 | /* TODO: find EP by ID and report_iommu_fault */ | |
546 | if (flags & VIRTIO_IOMMU_FAULT_F_ADDRESS) | |
547 | dev_err_ratelimited(viommu->dev, "%s fault from EP %u at %#llx [%s%s%s]\n", | |
548 | reason_str, endpoint, address, | |
549 | flags & VIRTIO_IOMMU_FAULT_F_READ ? "R" : "", | |
550 | flags & VIRTIO_IOMMU_FAULT_F_WRITE ? "W" : "", | |
551 | flags & VIRTIO_IOMMU_FAULT_F_EXEC ? "X" : ""); | |
552 | else | |
553 | dev_err_ratelimited(viommu->dev, "%s fault from EP %u\n", | |
554 | reason_str, endpoint); | |
555 | return 0; | |
556 | } | |
557 | ||
558 | static void viommu_event_handler(struct virtqueue *vq) | |
559 | { | |
560 | int ret; | |
561 | unsigned int len; | |
562 | struct scatterlist sg[1]; | |
563 | struct viommu_event *evt; | |
564 | struct viommu_dev *viommu = vq->vdev->priv; | |
565 | ||
566 | while ((evt = virtqueue_get_buf(vq, &len)) != NULL) { | |
567 | if (len > sizeof(*evt)) { | |
568 | dev_err(viommu->dev, | |
569 | "invalid event buffer (len %u != %zu)\n", | |
570 | len, sizeof(*evt)); | |
571 | } else if (!(evt->head & VIOMMU_FAULT_RESV_MASK)) { | |
572 | viommu_fault_handler(viommu, &evt->fault); | |
573 | } | |
574 | ||
575 | sg_init_one(sg, evt, sizeof(*evt)); | |
576 | ret = virtqueue_add_inbuf(vq, sg, 1, evt, GFP_ATOMIC); | |
577 | if (ret) | |
578 | dev_err(viommu->dev, "could not add event buffer\n"); | |
579 | } | |
580 | ||
581 | virtqueue_kick(vq); | |
582 | } | |
583 | ||
edcd69ab JPB |
584 | /* IOMMU API */ |
585 | ||
586 | static struct iommu_domain *viommu_domain_alloc(unsigned type) | |
587 | { | |
588 | struct viommu_domain *vdomain; | |
589 | ||
590 | if (type != IOMMU_DOMAIN_UNMANAGED && type != IOMMU_DOMAIN_DMA) | |
591 | return NULL; | |
592 | ||
593 | vdomain = kzalloc(sizeof(*vdomain), GFP_KERNEL); | |
594 | if (!vdomain) | |
595 | return NULL; | |
596 | ||
597 | mutex_init(&vdomain->mutex); | |
598 | spin_lock_init(&vdomain->mappings_lock); | |
599 | vdomain->mappings = RB_ROOT_CACHED; | |
600 | ||
601 | if (type == IOMMU_DOMAIN_DMA && | |
602 | iommu_get_dma_cookie(&vdomain->domain)) { | |
603 | kfree(vdomain); | |
604 | return NULL; | |
605 | } | |
606 | ||
607 | return &vdomain->domain; | |
608 | } | |
609 | ||
39b3b3c9 | 610 | static int viommu_domain_finalise(struct viommu_endpoint *vdev, |
edcd69ab JPB |
611 | struct iommu_domain *domain) |
612 | { | |
613 | int ret; | |
39b3b3c9 JPB |
614 | unsigned long viommu_page_size; |
615 | struct viommu_dev *viommu = vdev->viommu; | |
edcd69ab | 616 | struct viommu_domain *vdomain = to_viommu_domain(domain); |
edcd69ab | 617 | |
39b3b3c9 JPB |
618 | viommu_page_size = 1UL << __ffs(viommu->pgsize_bitmap); |
619 | if (viommu_page_size > PAGE_SIZE) { | |
620 | dev_err(vdev->dev, | |
621 | "granule 0x%lx larger than system page size 0x%lx\n", | |
622 | viommu_page_size, PAGE_SIZE); | |
623 | return -EINVAL; | |
624 | } | |
625 | ||
7062af3e JPB |
626 | ret = ida_alloc_range(&viommu->domain_ids, viommu->first_domain, |
627 | viommu->last_domain, GFP_KERNEL); | |
628 | if (ret < 0) | |
629 | return ret; | |
630 | ||
631 | vdomain->id = (unsigned int)ret; | |
edcd69ab JPB |
632 | |
633 | domain->pgsize_bitmap = viommu->pgsize_bitmap; | |
634 | domain->geometry = viommu->geometry; | |
635 | ||
7062af3e JPB |
636 | vdomain->map_flags = viommu->map_flags; |
637 | vdomain->viommu = viommu; | |
edcd69ab | 638 | |
7062af3e | 639 | return 0; |
edcd69ab JPB |
640 | } |
641 | ||
642 | static void viommu_domain_free(struct iommu_domain *domain) | |
643 | { | |
644 | struct viommu_domain *vdomain = to_viommu_domain(domain); | |
645 | ||
646 | iommu_put_dma_cookie(domain); | |
647 | ||
648 | /* Free all remaining mappings (size 2^64) */ | |
649 | viommu_del_mappings(vdomain, 0, 0); | |
650 | ||
651 | if (vdomain->viommu) | |
652 | ida_free(&vdomain->viommu->domain_ids, vdomain->id); | |
653 | ||
654 | kfree(vdomain); | |
655 | } | |
656 | ||
657 | static int viommu_attach_dev(struct iommu_domain *domain, struct device *dev) | |
658 | { | |
659 | int i; | |
660 | int ret = 0; | |
661 | struct virtio_iommu_req_attach req; | |
662 | struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); | |
a4b6c2af | 663 | struct viommu_endpoint *vdev = dev_iommu_priv_get(dev); |
edcd69ab JPB |
664 | struct viommu_domain *vdomain = to_viommu_domain(domain); |
665 | ||
666 | mutex_lock(&vdomain->mutex); | |
667 | if (!vdomain->viommu) { | |
668 | /* | |
669 | * Properly initialize the domain now that we know which viommu | |
670 | * owns it. | |
671 | */ | |
39b3b3c9 | 672 | ret = viommu_domain_finalise(vdev, domain); |
edcd69ab JPB |
673 | } else if (vdomain->viommu != vdev->viommu) { |
674 | dev_err(dev, "cannot attach to foreign vIOMMU\n"); | |
675 | ret = -EXDEV; | |
676 | } | |
677 | mutex_unlock(&vdomain->mutex); | |
678 | ||
679 | if (ret) | |
680 | return ret; | |
681 | ||
682 | /* | |
683 | * In the virtio-iommu device, when attaching the endpoint to a new | |
684 | * domain, it is detached from the old one and, if as as a result the | |
685 | * old domain isn't attached to any endpoint, all mappings are removed | |
686 | * from the old domain and it is freed. | |
687 | * | |
688 | * In the driver the old domain still exists, and its mappings will be | |
689 | * recreated if it gets reattached to an endpoint. Otherwise it will be | |
690 | * freed explicitly. | |
691 | * | |
692 | * vdev->vdomain is protected by group->mutex | |
693 | */ | |
694 | if (vdev->vdomain) | |
695 | vdev->vdomain->nr_endpoints--; | |
696 | ||
697 | req = (struct virtio_iommu_req_attach) { | |
698 | .head.type = VIRTIO_IOMMU_T_ATTACH, | |
699 | .domain = cpu_to_le32(vdomain->id), | |
700 | }; | |
701 | ||
702 | for (i = 0; i < fwspec->num_ids; i++) { | |
703 | req.endpoint = cpu_to_le32(fwspec->ids[i]); | |
704 | ||
705 | ret = viommu_send_req_sync(vdomain->viommu, &req, sizeof(req)); | |
706 | if (ret) | |
707 | return ret; | |
708 | } | |
709 | ||
710 | if (!vdomain->nr_endpoints) { | |
711 | /* | |
712 | * This endpoint is the first to be attached to the domain. | |
713 | * Replay existing mappings (e.g. SW MSI). | |
714 | */ | |
715 | ret = viommu_replay_mappings(vdomain); | |
716 | if (ret) | |
717 | return ret; | |
718 | } | |
719 | ||
720 | vdomain->nr_endpoints++; | |
721 | vdev->vdomain = vdomain; | |
722 | ||
723 | return 0; | |
724 | } | |
725 | ||
726 | static int viommu_map(struct iommu_domain *domain, unsigned long iova, | |
781ca2de | 727 | phys_addr_t paddr, size_t size, int prot, gfp_t gfp) |
edcd69ab JPB |
728 | { |
729 | int ret; | |
ae24fb49 | 730 | u32 flags; |
edcd69ab JPB |
731 | struct virtio_iommu_req_map map; |
732 | struct viommu_domain *vdomain = to_viommu_domain(domain); | |
733 | ||
734 | flags = (prot & IOMMU_READ ? VIRTIO_IOMMU_MAP_F_READ : 0) | | |
735 | (prot & IOMMU_WRITE ? VIRTIO_IOMMU_MAP_F_WRITE : 0) | | |
736 | (prot & IOMMU_MMIO ? VIRTIO_IOMMU_MAP_F_MMIO : 0); | |
737 | ||
ae24fb49 JPB |
738 | if (flags & ~vdomain->map_flags) |
739 | return -EINVAL; | |
740 | ||
edcd69ab JPB |
741 | ret = viommu_add_mapping(vdomain, iova, paddr, size, flags); |
742 | if (ret) | |
743 | return ret; | |
744 | ||
745 | map = (struct virtio_iommu_req_map) { | |
746 | .head.type = VIRTIO_IOMMU_T_MAP, | |
747 | .domain = cpu_to_le32(vdomain->id), | |
748 | .virt_start = cpu_to_le64(iova), | |
749 | .phys_start = cpu_to_le64(paddr), | |
750 | .virt_end = cpu_to_le64(iova + size - 1), | |
751 | .flags = cpu_to_le32(flags), | |
752 | }; | |
753 | ||
754 | if (!vdomain->nr_endpoints) | |
755 | return 0; | |
756 | ||
757 | ret = viommu_send_req_sync(vdomain->viommu, &map, sizeof(map)); | |
758 | if (ret) | |
759 | viommu_del_mappings(vdomain, iova, size); | |
760 | ||
761 | return ret; | |
762 | } | |
763 | ||
764 | static size_t viommu_unmap(struct iommu_domain *domain, unsigned long iova, | |
56f8af5e | 765 | size_t size, struct iommu_iotlb_gather *gather) |
edcd69ab JPB |
766 | { |
767 | int ret = 0; | |
768 | size_t unmapped; | |
769 | struct virtio_iommu_req_unmap unmap; | |
770 | struct viommu_domain *vdomain = to_viommu_domain(domain); | |
771 | ||
772 | unmapped = viommu_del_mappings(vdomain, iova, size); | |
773 | if (unmapped < size) | |
774 | return 0; | |
775 | ||
776 | /* Device already removed all mappings after detach. */ | |
777 | if (!vdomain->nr_endpoints) | |
778 | return unmapped; | |
779 | ||
780 | unmap = (struct virtio_iommu_req_unmap) { | |
781 | .head.type = VIRTIO_IOMMU_T_UNMAP, | |
782 | .domain = cpu_to_le32(vdomain->id), | |
783 | .virt_start = cpu_to_le64(iova), | |
784 | .virt_end = cpu_to_le64(iova + unmapped - 1), | |
785 | }; | |
786 | ||
787 | ret = viommu_add_req(vdomain->viommu, &unmap, sizeof(unmap)); | |
788 | return ret ? 0 : unmapped; | |
789 | } | |
790 | ||
791 | static phys_addr_t viommu_iova_to_phys(struct iommu_domain *domain, | |
792 | dma_addr_t iova) | |
793 | { | |
794 | u64 paddr = 0; | |
795 | unsigned long flags; | |
796 | struct viommu_mapping *mapping; | |
797 | struct interval_tree_node *node; | |
798 | struct viommu_domain *vdomain = to_viommu_domain(domain); | |
799 | ||
800 | spin_lock_irqsave(&vdomain->mappings_lock, flags); | |
801 | node = interval_tree_iter_first(&vdomain->mappings, iova, iova); | |
802 | if (node) { | |
803 | mapping = container_of(node, struct viommu_mapping, iova); | |
804 | paddr = mapping->paddr + (iova - mapping->iova.start); | |
805 | } | |
806 | spin_unlock_irqrestore(&vdomain->mappings_lock, flags); | |
807 | ||
808 | return paddr; | |
809 | } | |
810 | ||
56f8af5e WD |
811 | static void viommu_iotlb_sync(struct iommu_domain *domain, |
812 | struct iommu_iotlb_gather *gather) | |
edcd69ab JPB |
813 | { |
814 | struct viommu_domain *vdomain = to_viommu_domain(domain); | |
815 | ||
816 | viommu_sync_req(vdomain->viommu); | |
817 | } | |
818 | ||
819 | static void viommu_get_resv_regions(struct device *dev, struct list_head *head) | |
820 | { | |
2a5a3148 | 821 | struct iommu_resv_region *entry, *new_entry, *msi = NULL; |
a4b6c2af | 822 | struct viommu_endpoint *vdev = dev_iommu_priv_get(dev); |
edcd69ab JPB |
823 | int prot = IOMMU_WRITE | IOMMU_NOEXEC | IOMMU_MMIO; |
824 | ||
2a5a3148 JPB |
825 | list_for_each_entry(entry, &vdev->resv_regions, list) { |
826 | if (entry->type == IOMMU_RESV_MSI) | |
827 | msi = entry; | |
828 | ||
829 | new_entry = kmemdup(entry, sizeof(*entry), GFP_KERNEL); | |
830 | if (!new_entry) | |
831 | return; | |
832 | list_add_tail(&new_entry->list, head); | |
833 | } | |
834 | ||
835 | /* | |
836 | * If the device didn't register any bypass MSI window, add a | |
837 | * software-mapped region. | |
838 | */ | |
839 | if (!msi) { | |
840 | msi = iommu_alloc_resv_region(MSI_IOVA_BASE, MSI_IOVA_LENGTH, | |
841 | prot, IOMMU_RESV_SW_MSI); | |
842 | if (!msi) | |
843 | return; | |
844 | ||
845 | list_add_tail(&msi->list, head); | |
846 | } | |
edcd69ab | 847 | |
edcd69ab JPB |
848 | iommu_dma_get_resv_regions(dev, head); |
849 | } | |
850 | ||
edcd69ab JPB |
851 | static struct iommu_ops viommu_ops; |
852 | static struct virtio_driver virtio_iommu_drv; | |
853 | ||
3a1d5384 | 854 | static int viommu_match_node(struct device *dev, const void *data) |
edcd69ab JPB |
855 | { |
856 | return dev->parent->fwnode == data; | |
857 | } | |
858 | ||
859 | static struct viommu_dev *viommu_get_by_fwnode(struct fwnode_handle *fwnode) | |
860 | { | |
861 | struct device *dev = driver_find_device(&virtio_iommu_drv.driver, NULL, | |
862 | fwnode, viommu_match_node); | |
863 | put_device(dev); | |
864 | ||
865 | return dev ? dev_to_virtio(dev)->priv : NULL; | |
866 | } | |
867 | ||
868 | static int viommu_add_device(struct device *dev) | |
869 | { | |
870 | int ret; | |
871 | struct iommu_group *group; | |
872 | struct viommu_endpoint *vdev; | |
873 | struct viommu_dev *viommu = NULL; | |
874 | struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); | |
875 | ||
876 | if (!fwspec || fwspec->ops != &viommu_ops) | |
877 | return -ENODEV; | |
878 | ||
879 | viommu = viommu_get_by_fwnode(fwspec->iommu_fwnode); | |
880 | if (!viommu) | |
881 | return -ENODEV; | |
882 | ||
883 | vdev = kzalloc(sizeof(*vdev), GFP_KERNEL); | |
884 | if (!vdev) | |
885 | return -ENOMEM; | |
886 | ||
2a5a3148 | 887 | vdev->dev = dev; |
edcd69ab | 888 | vdev->viommu = viommu; |
2a5a3148 | 889 | INIT_LIST_HEAD(&vdev->resv_regions); |
a4b6c2af | 890 | dev_iommu_priv_set(dev, vdev); |
edcd69ab | 891 | |
2a5a3148 JPB |
892 | if (viommu->probe_size) { |
893 | /* Get additional information for this endpoint */ | |
894 | ret = viommu_probe_endpoint(viommu, dev); | |
895 | if (ret) | |
896 | goto err_free_dev; | |
897 | } | |
898 | ||
edcd69ab JPB |
899 | ret = iommu_device_link(&viommu->iommu, dev); |
900 | if (ret) | |
901 | goto err_free_dev; | |
902 | ||
903 | /* | |
904 | * Last step creates a default domain and attaches to it. Everything | |
905 | * must be ready. | |
906 | */ | |
907 | group = iommu_group_get_for_dev(dev); | |
908 | if (IS_ERR(group)) { | |
909 | ret = PTR_ERR(group); | |
910 | goto err_unlink_dev; | |
911 | } | |
912 | ||
913 | iommu_group_put(group); | |
914 | ||
915 | return PTR_ERR_OR_ZERO(group); | |
916 | ||
917 | err_unlink_dev: | |
918 | iommu_device_unlink(&viommu->iommu, dev); | |
919 | err_free_dev: | |
c11738cf | 920 | generic_iommu_put_resv_regions(dev, &vdev->resv_regions); |
edcd69ab JPB |
921 | kfree(vdev); |
922 | ||
923 | return ret; | |
924 | } | |
925 | ||
926 | static void viommu_remove_device(struct device *dev) | |
927 | { | |
928 | struct viommu_endpoint *vdev; | |
929 | struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); | |
930 | ||
931 | if (!fwspec || fwspec->ops != &viommu_ops) | |
932 | return; | |
933 | ||
a4b6c2af | 934 | vdev = dev_iommu_priv_get(dev); |
edcd69ab JPB |
935 | |
936 | iommu_group_remove_device(dev); | |
937 | iommu_device_unlink(&vdev->viommu->iommu, dev); | |
c11738cf | 938 | generic_iommu_put_resv_regions(dev, &vdev->resv_regions); |
edcd69ab JPB |
939 | kfree(vdev); |
940 | } | |
941 | ||
942 | static struct iommu_group *viommu_device_group(struct device *dev) | |
943 | { | |
944 | if (dev_is_pci(dev)) | |
945 | return pci_device_group(dev); | |
946 | else | |
947 | return generic_device_group(dev); | |
948 | } | |
949 | ||
950 | static int viommu_of_xlate(struct device *dev, struct of_phandle_args *args) | |
951 | { | |
952 | return iommu_fwspec_add_ids(dev, args->args, 1); | |
953 | } | |
954 | ||
955 | static struct iommu_ops viommu_ops = { | |
956 | .domain_alloc = viommu_domain_alloc, | |
957 | .domain_free = viommu_domain_free, | |
958 | .attach_dev = viommu_attach_dev, | |
959 | .map = viommu_map, | |
960 | .unmap = viommu_unmap, | |
961 | .iova_to_phys = viommu_iova_to_phys, | |
962 | .iotlb_sync = viommu_iotlb_sync, | |
963 | .add_device = viommu_add_device, | |
964 | .remove_device = viommu_remove_device, | |
965 | .device_group = viommu_device_group, | |
966 | .get_resv_regions = viommu_get_resv_regions, | |
c11738cf | 967 | .put_resv_regions = generic_iommu_put_resv_regions, |
edcd69ab JPB |
968 | .of_xlate = viommu_of_xlate, |
969 | }; | |
970 | ||
971 | static int viommu_init_vqs(struct viommu_dev *viommu) | |
972 | { | |
973 | struct virtio_device *vdev = dev_to_virtio(viommu->dev); | |
169a126c JPB |
974 | const char *names[] = { "request", "event" }; |
975 | vq_callback_t *callbacks[] = { | |
976 | NULL, /* No async requests */ | |
977 | viommu_event_handler, | |
978 | }; | |
edcd69ab | 979 | |
169a126c JPB |
980 | return virtio_find_vqs(vdev, VIOMMU_NR_VQS, viommu->vqs, callbacks, |
981 | names, NULL); | |
982 | } | |
edcd69ab | 983 | |
169a126c JPB |
984 | static int viommu_fill_evtq(struct viommu_dev *viommu) |
985 | { | |
986 | int i, ret; | |
987 | struct scatterlist sg[1]; | |
988 | struct viommu_event *evts; | |
989 | struct virtqueue *vq = viommu->vqs[VIOMMU_EVENT_VQ]; | |
990 | size_t nr_evts = vq->num_free; | |
991 | ||
992 | viommu->evts = evts = devm_kmalloc_array(viommu->dev, nr_evts, | |
993 | sizeof(*evts), GFP_KERNEL); | |
994 | if (!evts) | |
995 | return -ENOMEM; | |
996 | ||
997 | for (i = 0; i < nr_evts; i++) { | |
998 | sg_init_one(sg, &evts[i], sizeof(*evts)); | |
999 | ret = virtqueue_add_inbuf(vq, sg, 1, &evts[i], GFP_KERNEL); | |
1000 | if (ret) | |
1001 | return ret; | |
1002 | } | |
edcd69ab JPB |
1003 | |
1004 | return 0; | |
1005 | } | |
1006 | ||
1007 | static int viommu_probe(struct virtio_device *vdev) | |
1008 | { | |
1009 | struct device *parent_dev = vdev->dev.parent; | |
1010 | struct viommu_dev *viommu = NULL; | |
1011 | struct device *dev = &vdev->dev; | |
1012 | u64 input_start = 0; | |
1013 | u64 input_end = -1UL; | |
1014 | int ret; | |
1015 | ||
1016 | if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1) || | |
1017 | !virtio_has_feature(vdev, VIRTIO_IOMMU_F_MAP_UNMAP)) | |
1018 | return -ENODEV; | |
1019 | ||
1020 | viommu = devm_kzalloc(dev, sizeof(*viommu), GFP_KERNEL); | |
1021 | if (!viommu) | |
1022 | return -ENOMEM; | |
1023 | ||
1024 | spin_lock_init(&viommu->request_lock); | |
1025 | ida_init(&viommu->domain_ids); | |
1026 | viommu->dev = dev; | |
1027 | viommu->vdev = vdev; | |
1028 | INIT_LIST_HEAD(&viommu->requests); | |
1029 | ||
1030 | ret = viommu_init_vqs(viommu); | |
1031 | if (ret) | |
1032 | return ret; | |
1033 | ||
1034 | virtio_cread(vdev, struct virtio_iommu_config, page_size_mask, | |
1035 | &viommu->pgsize_bitmap); | |
1036 | ||
1037 | if (!viommu->pgsize_bitmap) { | |
1038 | ret = -EINVAL; | |
1039 | goto err_free_vqs; | |
1040 | } | |
1041 | ||
ae24fb49 JPB |
1042 | viommu->map_flags = VIRTIO_IOMMU_MAP_F_READ | VIRTIO_IOMMU_MAP_F_WRITE; |
1043 | viommu->last_domain = ~0U; | |
edcd69ab JPB |
1044 | |
1045 | /* Optional features */ | |
1046 | virtio_cread_feature(vdev, VIRTIO_IOMMU_F_INPUT_RANGE, | |
1047 | struct virtio_iommu_config, input_range.start, | |
1048 | &input_start); | |
1049 | ||
1050 | virtio_cread_feature(vdev, VIRTIO_IOMMU_F_INPUT_RANGE, | |
1051 | struct virtio_iommu_config, input_range.end, | |
1052 | &input_end); | |
1053 | ||
ae24fb49 JPB |
1054 | virtio_cread_feature(vdev, VIRTIO_IOMMU_F_DOMAIN_RANGE, |
1055 | struct virtio_iommu_config, domain_range.start, | |
1056 | &viommu->first_domain); | |
1057 | ||
1058 | virtio_cread_feature(vdev, VIRTIO_IOMMU_F_DOMAIN_RANGE, | |
1059 | struct virtio_iommu_config, domain_range.end, | |
1060 | &viommu->last_domain); | |
edcd69ab | 1061 | |
2a5a3148 JPB |
1062 | virtio_cread_feature(vdev, VIRTIO_IOMMU_F_PROBE, |
1063 | struct virtio_iommu_config, probe_size, | |
1064 | &viommu->probe_size); | |
1065 | ||
edcd69ab JPB |
1066 | viommu->geometry = (struct iommu_domain_geometry) { |
1067 | .aperture_start = input_start, | |
1068 | .aperture_end = input_end, | |
1069 | .force_aperture = true, | |
1070 | }; | |
1071 | ||
ae24fb49 JPB |
1072 | if (virtio_has_feature(vdev, VIRTIO_IOMMU_F_MMIO)) |
1073 | viommu->map_flags |= VIRTIO_IOMMU_MAP_F_MMIO; | |
1074 | ||
edcd69ab JPB |
1075 | viommu_ops.pgsize_bitmap = viommu->pgsize_bitmap; |
1076 | ||
1077 | virtio_device_ready(vdev); | |
1078 | ||
169a126c JPB |
1079 | /* Populate the event queue with buffers */ |
1080 | ret = viommu_fill_evtq(viommu); | |
1081 | if (ret) | |
1082 | goto err_free_vqs; | |
1083 | ||
edcd69ab JPB |
1084 | ret = iommu_device_sysfs_add(&viommu->iommu, dev, NULL, "%s", |
1085 | virtio_bus_name(vdev)); | |
1086 | if (ret) | |
1087 | goto err_free_vqs; | |
1088 | ||
1089 | iommu_device_set_ops(&viommu->iommu, &viommu_ops); | |
1090 | iommu_device_set_fwnode(&viommu->iommu, parent_dev->fwnode); | |
1091 | ||
1092 | iommu_device_register(&viommu->iommu); | |
1093 | ||
1094 | #ifdef CONFIG_PCI | |
1095 | if (pci_bus_type.iommu_ops != &viommu_ops) { | |
edcd69ab JPB |
1096 | ret = bus_set_iommu(&pci_bus_type, &viommu_ops); |
1097 | if (ret) | |
1098 | goto err_unregister; | |
1099 | } | |
1100 | #endif | |
1101 | #ifdef CONFIG_ARM_AMBA | |
1102 | if (amba_bustype.iommu_ops != &viommu_ops) { | |
1103 | ret = bus_set_iommu(&amba_bustype, &viommu_ops); | |
1104 | if (ret) | |
1105 | goto err_unregister; | |
1106 | } | |
1107 | #endif | |
1108 | if (platform_bus_type.iommu_ops != &viommu_ops) { | |
1109 | ret = bus_set_iommu(&platform_bus_type, &viommu_ops); | |
1110 | if (ret) | |
1111 | goto err_unregister; | |
1112 | } | |
1113 | ||
1114 | vdev->priv = viommu; | |
1115 | ||
1116 | dev_info(dev, "input address: %u bits\n", | |
1117 | order_base_2(viommu->geometry.aperture_end)); | |
1118 | dev_info(dev, "page mask: %#llx\n", viommu->pgsize_bitmap); | |
1119 | ||
1120 | return 0; | |
1121 | ||
1122 | err_unregister: | |
1123 | iommu_device_sysfs_remove(&viommu->iommu); | |
1124 | iommu_device_unregister(&viommu->iommu); | |
1125 | err_free_vqs: | |
1126 | vdev->config->del_vqs(vdev); | |
1127 | ||
1128 | return ret; | |
1129 | } | |
1130 | ||
1131 | static void viommu_remove(struct virtio_device *vdev) | |
1132 | { | |
1133 | struct viommu_dev *viommu = vdev->priv; | |
1134 | ||
1135 | iommu_device_sysfs_remove(&viommu->iommu); | |
1136 | iommu_device_unregister(&viommu->iommu); | |
1137 | ||
1138 | /* Stop all virtqueues */ | |
1139 | vdev->config->reset(vdev); | |
1140 | vdev->config->del_vqs(vdev); | |
1141 | ||
1142 | dev_info(&vdev->dev, "device removed\n"); | |
1143 | } | |
1144 | ||
1145 | static void viommu_config_changed(struct virtio_device *vdev) | |
1146 | { | |
1147 | dev_warn(&vdev->dev, "config changed\n"); | |
1148 | } | |
1149 | ||
1150 | static unsigned int features[] = { | |
1151 | VIRTIO_IOMMU_F_MAP_UNMAP, | |
edcd69ab | 1152 | VIRTIO_IOMMU_F_INPUT_RANGE, |
ae24fb49 | 1153 | VIRTIO_IOMMU_F_DOMAIN_RANGE, |
2a5a3148 | 1154 | VIRTIO_IOMMU_F_PROBE, |
ae24fb49 | 1155 | VIRTIO_IOMMU_F_MMIO, |
edcd69ab JPB |
1156 | }; |
1157 | ||
1158 | static struct virtio_device_id id_table[] = { | |
1159 | { VIRTIO_ID_IOMMU, VIRTIO_DEV_ANY_ID }, | |
1160 | { 0 }, | |
1161 | }; | |
1162 | ||
1163 | static struct virtio_driver virtio_iommu_drv = { | |
1164 | .driver.name = KBUILD_MODNAME, | |
1165 | .driver.owner = THIS_MODULE, | |
1166 | .id_table = id_table, | |
1167 | .feature_table = features, | |
1168 | .feature_table_size = ARRAY_SIZE(features), | |
1169 | .probe = viommu_probe, | |
1170 | .remove = viommu_remove, | |
1171 | .config_changed = viommu_config_changed, | |
1172 | }; | |
1173 | ||
1174 | module_virtio_driver(virtio_iommu_drv); | |
1175 | ||
1176 | MODULE_DESCRIPTION("Virtio IOMMU driver"); | |
1177 | MODULE_AUTHOR("Jean-Philippe Brucker <jean-philippe.brucker@arm.com>"); | |
1178 | MODULE_LICENSE("GPL v2"); |