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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
73fa0d10 AW |
2 | /* |
3 | * VFIO: IOMMU DMA mapping support for Type1 IOMMU | |
4 | * | |
5 | * Copyright (C) 2012 Red Hat, Inc. All rights reserved. | |
6 | * Author: Alex Williamson <alex.williamson@redhat.com> | |
7 | * | |
73fa0d10 AW |
8 | * Derived from original vfio: |
9 | * Copyright 2010 Cisco Systems, Inc. All rights reserved. | |
10 | * Author: Tom Lyon, pugs@cisco.com | |
11 | * | |
12 | * We arbitrarily define a Type1 IOMMU as one matching the below code. | |
13 | * It could be called the x86 IOMMU as it's designed for AMD-Vi & Intel | |
14 | * VT-d, but that makes it harder to re-use as theoretically anyone | |
15 | * implementing a similar IOMMU could make use of this. We expect the | |
16 | * IOMMU to support the IOMMU API and have few to no restrictions around | |
17 | * the IOVA range that can be mapped. The Type1 IOMMU is currently | |
18 | * optimized for relatively static mappings of a userspace process with | |
19 | * userpsace pages pinned into memory. We also assume devices and IOMMU | |
20 | * domains are PCI based as the IOMMU API is still centered around a | |
21 | * device/bus interface rather than a group interface. | |
22 | */ | |
23 | ||
24 | #include <linux/compat.h> | |
25 | #include <linux/device.h> | |
26 | #include <linux/fs.h> | |
27 | #include <linux/iommu.h> | |
28 | #include <linux/module.h> | |
29 | #include <linux/mm.h> | |
cd9b2268 | 30 | #include <linux/rbtree.h> |
3f07c014 | 31 | #include <linux/sched/signal.h> |
6e84f315 | 32 | #include <linux/sched/mm.h> |
73fa0d10 AW |
33 | #include <linux/slab.h> |
34 | #include <linux/uaccess.h> | |
35 | #include <linux/vfio.h> | |
36 | #include <linux/workqueue.h> | |
a54eb550 | 37 | #include <linux/mdev.h> |
c086de81 | 38 | #include <linux/notifier.h> |
5d704992 | 39 | #include <linux/dma-iommu.h> |
9d72f87b | 40 | #include <linux/irqdomain.h> |
73fa0d10 AW |
41 | |
42 | #define DRIVER_VERSION "0.2" | |
43 | #define DRIVER_AUTHOR "Alex Williamson <alex.williamson@redhat.com>" | |
44 | #define DRIVER_DESC "Type1 IOMMU driver for VFIO" | |
45 | ||
46 | static bool allow_unsafe_interrupts; | |
47 | module_param_named(allow_unsafe_interrupts, | |
48 | allow_unsafe_interrupts, bool, S_IRUGO | S_IWUSR); | |
49 | MODULE_PARM_DESC(allow_unsafe_interrupts, | |
50 | "Enable VFIO IOMMU support for on platforms without interrupt remapping support."); | |
51 | ||
5c6c2b21 AW |
52 | static bool disable_hugepages; |
53 | module_param_named(disable_hugepages, | |
54 | disable_hugepages, bool, S_IRUGO | S_IWUSR); | |
55 | MODULE_PARM_DESC(disable_hugepages, | |
56 | "Disable VFIO IOMMU support for IOMMU hugepages."); | |
57 | ||
49285593 AW |
58 | static unsigned int dma_entry_limit __read_mostly = U16_MAX; |
59 | module_param_named(dma_entry_limit, dma_entry_limit, uint, 0644); | |
60 | MODULE_PARM_DESC(dma_entry_limit, | |
61 | "Maximum number of user DMA mappings per container (65535)."); | |
62 | ||
73fa0d10 | 63 | struct vfio_iommu { |
1ef3e2bc | 64 | struct list_head domain_list; |
1108696a | 65 | struct list_head iova_list; |
a54eb550 | 66 | struct vfio_domain *external_domain; /* domain for external user */ |
73fa0d10 | 67 | struct mutex lock; |
cd9b2268 | 68 | struct rb_root dma_list; |
c086de81 | 69 | struct blocking_notifier_head notifier; |
49285593 | 70 | unsigned int dma_avail; |
f5c9eceb WD |
71 | bool v2; |
72 | bool nesting; | |
1ef3e2bc AW |
73 | }; |
74 | ||
75 | struct vfio_domain { | |
76 | struct iommu_domain *domain; | |
77 | struct list_head next; | |
73fa0d10 | 78 | struct list_head group_list; |
1ef3e2bc | 79 | int prot; /* IOMMU_CACHE */ |
6fe1010d | 80 | bool fgsp; /* Fine-grained super pages */ |
73fa0d10 AW |
81 | }; |
82 | ||
83 | struct vfio_dma { | |
cd9b2268 | 84 | struct rb_node node; |
73fa0d10 AW |
85 | dma_addr_t iova; /* Device address */ |
86 | unsigned long vaddr; /* Process virtual addr */ | |
166fd7d9 | 87 | size_t size; /* Map size (bytes) */ |
73fa0d10 | 88 | int prot; /* IOMMU_READ/WRITE */ |
a54eb550 | 89 | bool iommu_mapped; |
48d8476b | 90 | bool lock_cap; /* capable(CAP_IPC_LOCK) */ |
8f0d5bb9 | 91 | struct task_struct *task; |
a54eb550 | 92 | struct rb_root pfn_list; /* Ex-user pinned pfn list */ |
73fa0d10 AW |
93 | }; |
94 | ||
95 | struct vfio_group { | |
96 | struct iommu_group *iommu_group; | |
97 | struct list_head next; | |
7bd50f0c | 98 | bool mdev_group; /* An mdev group */ |
73fa0d10 AW |
99 | }; |
100 | ||
1108696a SK |
101 | struct vfio_iova { |
102 | struct list_head list; | |
103 | dma_addr_t start; | |
104 | dma_addr_t end; | |
105 | }; | |
106 | ||
a54eb550 KW |
107 | /* |
108 | * Guest RAM pinning working set or DMA target | |
109 | */ | |
110 | struct vfio_pfn { | |
111 | struct rb_node node; | |
112 | dma_addr_t iova; /* Device address */ | |
113 | unsigned long pfn; /* Host pfn */ | |
114 | atomic_t ref_count; | |
115 | }; | |
116 | ||
6bd06f5a SS |
117 | struct vfio_regions { |
118 | struct list_head list; | |
119 | dma_addr_t iova; | |
120 | phys_addr_t phys; | |
121 | size_t len; | |
122 | }; | |
123 | ||
a54eb550 KW |
124 | #define IS_IOMMU_CAP_DOMAIN_IN_CONTAINER(iommu) \ |
125 | (!list_empty(&iommu->domain_list)) | |
126 | ||
127 | static int put_pfn(unsigned long pfn, int prot); | |
128 | ||
73fa0d10 AW |
129 | /* |
130 | * This code handles mapping and unmapping of user data buffers | |
131 | * into DMA'ble space using the IOMMU | |
132 | */ | |
133 | ||
cd9b2268 AW |
134 | static struct vfio_dma *vfio_find_dma(struct vfio_iommu *iommu, |
135 | dma_addr_t start, size_t size) | |
136 | { | |
137 | struct rb_node *node = iommu->dma_list.rb_node; | |
138 | ||
139 | while (node) { | |
140 | struct vfio_dma *dma = rb_entry(node, struct vfio_dma, node); | |
141 | ||
142 | if (start + size <= dma->iova) | |
143 | node = node->rb_left; | |
166fd7d9 | 144 | else if (start >= dma->iova + dma->size) |
cd9b2268 AW |
145 | node = node->rb_right; |
146 | else | |
147 | return dma; | |
148 | } | |
149 | ||
150 | return NULL; | |
151 | } | |
152 | ||
1ef3e2bc | 153 | static void vfio_link_dma(struct vfio_iommu *iommu, struct vfio_dma *new) |
cd9b2268 AW |
154 | { |
155 | struct rb_node **link = &iommu->dma_list.rb_node, *parent = NULL; | |
156 | struct vfio_dma *dma; | |
157 | ||
158 | while (*link) { | |
159 | parent = *link; | |
160 | dma = rb_entry(parent, struct vfio_dma, node); | |
161 | ||
166fd7d9 | 162 | if (new->iova + new->size <= dma->iova) |
cd9b2268 AW |
163 | link = &(*link)->rb_left; |
164 | else | |
165 | link = &(*link)->rb_right; | |
166 | } | |
167 | ||
168 | rb_link_node(&new->node, parent, link); | |
169 | rb_insert_color(&new->node, &iommu->dma_list); | |
170 | } | |
171 | ||
1ef3e2bc | 172 | static void vfio_unlink_dma(struct vfio_iommu *iommu, struct vfio_dma *old) |
cd9b2268 AW |
173 | { |
174 | rb_erase(&old->node, &iommu->dma_list); | |
175 | } | |
176 | ||
a54eb550 KW |
177 | /* |
178 | * Helper Functions for host iova-pfn list | |
179 | */ | |
180 | static struct vfio_pfn *vfio_find_vpfn(struct vfio_dma *dma, dma_addr_t iova) | |
181 | { | |
182 | struct vfio_pfn *vpfn; | |
183 | struct rb_node *node = dma->pfn_list.rb_node; | |
184 | ||
185 | while (node) { | |
186 | vpfn = rb_entry(node, struct vfio_pfn, node); | |
187 | ||
188 | if (iova < vpfn->iova) | |
189 | node = node->rb_left; | |
190 | else if (iova > vpfn->iova) | |
191 | node = node->rb_right; | |
192 | else | |
193 | return vpfn; | |
194 | } | |
195 | return NULL; | |
196 | } | |
197 | ||
198 | static void vfio_link_pfn(struct vfio_dma *dma, | |
199 | struct vfio_pfn *new) | |
200 | { | |
201 | struct rb_node **link, *parent = NULL; | |
202 | struct vfio_pfn *vpfn; | |
203 | ||
204 | link = &dma->pfn_list.rb_node; | |
205 | while (*link) { | |
206 | parent = *link; | |
207 | vpfn = rb_entry(parent, struct vfio_pfn, node); | |
208 | ||
209 | if (new->iova < vpfn->iova) | |
210 | link = &(*link)->rb_left; | |
211 | else | |
212 | link = &(*link)->rb_right; | |
213 | } | |
214 | ||
215 | rb_link_node(&new->node, parent, link); | |
216 | rb_insert_color(&new->node, &dma->pfn_list); | |
217 | } | |
218 | ||
219 | static void vfio_unlink_pfn(struct vfio_dma *dma, struct vfio_pfn *old) | |
220 | { | |
221 | rb_erase(&old->node, &dma->pfn_list); | |
222 | } | |
223 | ||
224 | static int vfio_add_to_pfn_list(struct vfio_dma *dma, dma_addr_t iova, | |
225 | unsigned long pfn) | |
226 | { | |
227 | struct vfio_pfn *vpfn; | |
228 | ||
229 | vpfn = kzalloc(sizeof(*vpfn), GFP_KERNEL); | |
230 | if (!vpfn) | |
231 | return -ENOMEM; | |
232 | ||
233 | vpfn->iova = iova; | |
234 | vpfn->pfn = pfn; | |
235 | atomic_set(&vpfn->ref_count, 1); | |
236 | vfio_link_pfn(dma, vpfn); | |
237 | return 0; | |
238 | } | |
239 | ||
240 | static void vfio_remove_from_pfn_list(struct vfio_dma *dma, | |
241 | struct vfio_pfn *vpfn) | |
242 | { | |
243 | vfio_unlink_pfn(dma, vpfn); | |
244 | kfree(vpfn); | |
245 | } | |
246 | ||
247 | static struct vfio_pfn *vfio_iova_get_vfio_pfn(struct vfio_dma *dma, | |
248 | unsigned long iova) | |
249 | { | |
250 | struct vfio_pfn *vpfn = vfio_find_vpfn(dma, iova); | |
251 | ||
252 | if (vpfn) | |
253 | atomic_inc(&vpfn->ref_count); | |
254 | return vpfn; | |
255 | } | |
256 | ||
257 | static int vfio_iova_put_vfio_pfn(struct vfio_dma *dma, struct vfio_pfn *vpfn) | |
258 | { | |
259 | int ret = 0; | |
260 | ||
261 | if (atomic_dec_and_test(&vpfn->ref_count)) { | |
262 | ret = put_pfn(vpfn->pfn, dma->prot); | |
263 | vfio_remove_from_pfn_list(dma, vpfn); | |
264 | } | |
265 | return ret; | |
266 | } | |
267 | ||
48d8476b | 268 | static int vfio_lock_acct(struct vfio_dma *dma, long npage, bool async) |
73fa0d10 | 269 | { |
73fa0d10 | 270 | struct mm_struct *mm; |
0cfef2b7 | 271 | int ret; |
73fa0d10 | 272 | |
3624a248 | 273 | if (!npage) |
0cfef2b7 | 274 | return 0; |
3624a248 | 275 | |
48d8476b | 276 | mm = async ? get_task_mm(dma->task) : dma->task->mm; |
3624a248 | 277 | if (!mm) |
0cfef2b7 | 278 | return -ESRCH; /* process exited */ |
73fa0d10 | 279 | |
0cfef2b7 AW |
280 | ret = down_write_killable(&mm->mmap_sem); |
281 | if (!ret) { | |
79eb597c DJ |
282 | ret = __account_locked_vm(mm, abs(npage), npage > 0, dma->task, |
283 | dma->lock_cap); | |
0cfef2b7 | 284 | up_write(&mm->mmap_sem); |
6c38c055 AW |
285 | } |
286 | ||
48d8476b | 287 | if (async) |
3624a248 | 288 | mmput(mm); |
0cfef2b7 AW |
289 | |
290 | return ret; | |
73fa0d10 AW |
291 | } |
292 | ||
293 | /* | |
294 | * Some mappings aren't backed by a struct page, for example an mmap'd | |
295 | * MMIO range for our own or another device. These use a different | |
296 | * pfn conversion and shouldn't be tracked as locked pages. | |
297 | */ | |
298 | static bool is_invalid_reserved_pfn(unsigned long pfn) | |
299 | { | |
300 | if (pfn_valid(pfn)) { | |
301 | bool reserved; | |
302 | struct page *tail = pfn_to_page(pfn); | |
668f9abb | 303 | struct page *head = compound_head(tail); |
73fa0d10 AW |
304 | reserved = !!(PageReserved(head)); |
305 | if (head != tail) { | |
306 | /* | |
307 | * "head" is not a dangling pointer | |
668f9abb | 308 | * (compound_head takes care of that) |
73fa0d10 AW |
309 | * but the hugepage may have been split |
310 | * from under us (and we may not hold a | |
311 | * reference count on the head page so it can | |
312 | * be reused before we run PageReferenced), so | |
313 | * we've to check PageTail before returning | |
314 | * what we just read. | |
315 | */ | |
316 | smp_rmb(); | |
317 | if (PageTail(tail)) | |
318 | return reserved; | |
319 | } | |
320 | return PageReserved(tail); | |
321 | } | |
322 | ||
323 | return true; | |
324 | } | |
325 | ||
326 | static int put_pfn(unsigned long pfn, int prot) | |
327 | { | |
328 | if (!is_invalid_reserved_pfn(pfn)) { | |
329 | struct page *page = pfn_to_page(pfn); | |
330 | if (prot & IOMMU_WRITE) | |
331 | SetPageDirty(page); | |
332 | put_page(page); | |
333 | return 1; | |
334 | } | |
335 | return 0; | |
336 | } | |
337 | ||
ea85cf35 KW |
338 | static int vaddr_get_pfn(struct mm_struct *mm, unsigned long vaddr, |
339 | int prot, unsigned long *pfn) | |
73fa0d10 AW |
340 | { |
341 | struct page *page[1]; | |
342 | struct vm_area_struct *vma; | |
94db151d | 343 | struct vm_area_struct *vmas[1]; |
bb94b55a | 344 | unsigned int flags = 0; |
ea85cf35 | 345 | int ret; |
73fa0d10 | 346 | |
bb94b55a JG |
347 | if (prot & IOMMU_WRITE) |
348 | flags |= FOLL_WRITE; | |
349 | ||
350 | down_read(&mm->mmap_sem); | |
ea85cf35 | 351 | if (mm == current->mm) { |
932f4a63 IW |
352 | ret = get_user_pages(vaddr, 1, flags | FOLL_LONGTERM, page, |
353 | vmas); | |
ea85cf35 | 354 | } else { |
ea85cf35 | 355 | ret = get_user_pages_remote(NULL, mm, vaddr, 1, flags, page, |
94db151d DW |
356 | vmas, NULL); |
357 | /* | |
358 | * The lifetime of a vaddr_get_pfn() page pin is | |
359 | * userspace-controlled. In the fs-dax case this could | |
360 | * lead to indefinite stalls in filesystem operations. | |
361 | * Disallow attempts to pin fs-dax pages via this | |
362 | * interface. | |
363 | */ | |
364 | if (ret > 0 && vma_is_fsdax(vmas[0])) { | |
365 | ret = -EOPNOTSUPP; | |
366 | put_page(page[0]); | |
367 | } | |
ea85cf35 | 368 | } |
bb94b55a | 369 | up_read(&mm->mmap_sem); |
ea85cf35 KW |
370 | |
371 | if (ret == 1) { | |
73fa0d10 AW |
372 | *pfn = page_to_pfn(page[0]); |
373 | return 0; | |
374 | } | |
375 | ||
ea85cf35 | 376 | down_read(&mm->mmap_sem); |
73fa0d10 | 377 | |
6cf5354c AK |
378 | vaddr = untagged_addr(vaddr); |
379 | ||
ea85cf35 | 380 | vma = find_vma_intersection(mm, vaddr, vaddr + 1); |
73fa0d10 AW |
381 | |
382 | if (vma && vma->vm_flags & VM_PFNMAP) { | |
383 | *pfn = ((vaddr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff; | |
384 | if (is_invalid_reserved_pfn(*pfn)) | |
385 | ret = 0; | |
386 | } | |
387 | ||
ea85cf35 | 388 | up_read(&mm->mmap_sem); |
73fa0d10 AW |
389 | return ret; |
390 | } | |
391 | ||
166fd7d9 AW |
392 | /* |
393 | * Attempt to pin pages. We really don't want to track all the pfns and | |
394 | * the iommu can only map chunks of consecutive pfns anyway, so get the | |
395 | * first page and all consecutive pages with the same locking. | |
396 | */ | |
8f0d5bb9 | 397 | static long vfio_pin_pages_remote(struct vfio_dma *dma, unsigned long vaddr, |
7cb671e7 | 398 | long npage, unsigned long *pfn_base, |
48d8476b | 399 | unsigned long limit) |
73fa0d10 | 400 | { |
7cb671e7 | 401 | unsigned long pfn = 0; |
6c38c055 | 402 | long ret, pinned = 0, lock_acct = 0; |
89c29def | 403 | bool rsvd; |
a54eb550 | 404 | dma_addr_t iova = vaddr - dma->vaddr + dma->iova; |
73fa0d10 | 405 | |
6c38c055 AW |
406 | /* This code path is only user initiated */ |
407 | if (!current->mm) | |
166fd7d9 | 408 | return -ENODEV; |
73fa0d10 | 409 | |
6c38c055 | 410 | ret = vaddr_get_pfn(current->mm, vaddr, dma->prot, pfn_base); |
166fd7d9 | 411 | if (ret) |
6c38c055 | 412 | return ret; |
73fa0d10 | 413 | |
6c38c055 | 414 | pinned++; |
89c29def | 415 | rsvd = is_invalid_reserved_pfn(*pfn_base); |
73fa0d10 | 416 | |
a54eb550 KW |
417 | /* |
418 | * Reserved pages aren't counted against the user, externally pinned | |
419 | * pages are already counted against the user. | |
420 | */ | |
89c29def | 421 | if (!rsvd && !vfio_find_vpfn(dma, iova)) { |
48d8476b | 422 | if (!dma->lock_cap && current->mm->locked_vm + 1 > limit) { |
a54eb550 KW |
423 | put_pfn(*pfn_base, dma->prot); |
424 | pr_warn("%s: RLIMIT_MEMLOCK (%ld) exceeded\n", __func__, | |
425 | limit << PAGE_SHIFT); | |
6c38c055 | 426 | return -ENOMEM; |
a54eb550 KW |
427 | } |
428 | lock_acct++; | |
5c6c2b21 AW |
429 | } |
430 | ||
6c38c055 AW |
431 | if (unlikely(disable_hugepages)) |
432 | goto out; | |
73fa0d10 | 433 | |
6c38c055 AW |
434 | /* Lock all the consecutive pages from pfn_base */ |
435 | for (vaddr += PAGE_SIZE, iova += PAGE_SIZE; pinned < npage; | |
436 | pinned++, vaddr += PAGE_SIZE, iova += PAGE_SIZE) { | |
6c38c055 AW |
437 | ret = vaddr_get_pfn(current->mm, vaddr, dma->prot, &pfn); |
438 | if (ret) | |
439 | break; | |
440 | ||
89c29def AW |
441 | if (pfn != *pfn_base + pinned || |
442 | rsvd != is_invalid_reserved_pfn(pfn)) { | |
6c38c055 AW |
443 | put_pfn(pfn, dma->prot); |
444 | break; | |
445 | } | |
166fd7d9 | 446 | |
89c29def | 447 | if (!rsvd && !vfio_find_vpfn(dma, iova)) { |
48d8476b | 448 | if (!dma->lock_cap && |
6c38c055 | 449 | current->mm->locked_vm + lock_acct + 1 > limit) { |
a54eb550 | 450 | put_pfn(pfn, dma->prot); |
6c38c055 AW |
451 | pr_warn("%s: RLIMIT_MEMLOCK (%ld) exceeded\n", |
452 | __func__, limit << PAGE_SHIFT); | |
0cfef2b7 AW |
453 | ret = -ENOMEM; |
454 | goto unpin_out; | |
a54eb550 | 455 | } |
6c38c055 | 456 | lock_acct++; |
166fd7d9 AW |
457 | } |
458 | } | |
459 | ||
6c38c055 | 460 | out: |
48d8476b | 461 | ret = vfio_lock_acct(dma, lock_acct, false); |
0cfef2b7 AW |
462 | |
463 | unpin_out: | |
464 | if (ret) { | |
89c29def AW |
465 | if (!rsvd) { |
466 | for (pfn = *pfn_base ; pinned ; pfn++, pinned--) | |
467 | put_pfn(pfn, dma->prot); | |
468 | } | |
0cfef2b7 AW |
469 | |
470 | return ret; | |
471 | } | |
166fd7d9 | 472 | |
6c38c055 | 473 | return pinned; |
166fd7d9 AW |
474 | } |
475 | ||
a54eb550 KW |
476 | static long vfio_unpin_pages_remote(struct vfio_dma *dma, dma_addr_t iova, |
477 | unsigned long pfn, long npage, | |
478 | bool do_accounting) | |
166fd7d9 | 479 | { |
a54eb550 | 480 | long unlocked = 0, locked = 0; |
166fd7d9 AW |
481 | long i; |
482 | ||
6c38c055 | 483 | for (i = 0; i < npage; i++, iova += PAGE_SIZE) { |
a54eb550 KW |
484 | if (put_pfn(pfn++, dma->prot)) { |
485 | unlocked++; | |
6c38c055 | 486 | if (vfio_find_vpfn(dma, iova)) |
a54eb550 KW |
487 | locked++; |
488 | } | |
489 | } | |
490 | ||
491 | if (do_accounting) | |
48d8476b | 492 | vfio_lock_acct(dma, locked - unlocked, true); |
a54eb550 KW |
493 | |
494 | return unlocked; | |
495 | } | |
496 | ||
497 | static int vfio_pin_page_external(struct vfio_dma *dma, unsigned long vaddr, | |
498 | unsigned long *pfn_base, bool do_accounting) | |
499 | { | |
a54eb550 KW |
500 | struct mm_struct *mm; |
501 | int ret; | |
a54eb550 KW |
502 | |
503 | mm = get_task_mm(dma->task); | |
504 | if (!mm) | |
505 | return -ENODEV; | |
506 | ||
507 | ret = vaddr_get_pfn(mm, vaddr, dma->prot, pfn_base); | |
80dbe1fb | 508 | if (!ret && do_accounting && !is_invalid_reserved_pfn(*pfn_base)) { |
48d8476b | 509 | ret = vfio_lock_acct(dma, 1, true); |
0cfef2b7 AW |
510 | if (ret) { |
511 | put_pfn(*pfn_base, dma->prot); | |
80dbe1fb AW |
512 | if (ret == -ENOMEM) |
513 | pr_warn("%s: Task %s (%d) RLIMIT_MEMLOCK " | |
514 | "(%ld) exceeded\n", __func__, | |
515 | dma->task->comm, task_pid_nr(dma->task), | |
516 | task_rlimit(dma->task, RLIMIT_MEMLOCK)); | |
0cfef2b7 AW |
517 | } |
518 | } | |
519 | ||
a54eb550 KW |
520 | mmput(mm); |
521 | return ret; | |
522 | } | |
523 | ||
524 | static int vfio_unpin_page_external(struct vfio_dma *dma, dma_addr_t iova, | |
525 | bool do_accounting) | |
526 | { | |
527 | int unlocked; | |
528 | struct vfio_pfn *vpfn = vfio_find_vpfn(dma, iova); | |
529 | ||
530 | if (!vpfn) | |
531 | return 0; | |
532 | ||
533 | unlocked = vfio_iova_put_vfio_pfn(dma, vpfn); | |
166fd7d9 AW |
534 | |
535 | if (do_accounting) | |
48d8476b | 536 | vfio_lock_acct(dma, -unlocked, true); |
166fd7d9 AW |
537 | |
538 | return unlocked; | |
539 | } | |
540 | ||
a54eb550 KW |
541 | static int vfio_iommu_type1_pin_pages(void *iommu_data, |
542 | unsigned long *user_pfn, | |
543 | int npage, int prot, | |
544 | unsigned long *phys_pfn) | |
545 | { | |
546 | struct vfio_iommu *iommu = iommu_data; | |
547 | int i, j, ret; | |
548 | unsigned long remote_vaddr; | |
549 | struct vfio_dma *dma; | |
550 | bool do_accounting; | |
551 | ||
552 | if (!iommu || !user_pfn || !phys_pfn) | |
553 | return -EINVAL; | |
554 | ||
555 | /* Supported for v2 version only */ | |
556 | if (!iommu->v2) | |
557 | return -EACCES; | |
558 | ||
559 | mutex_lock(&iommu->lock); | |
560 | ||
c086de81 | 561 | /* Fail if notifier list is empty */ |
be068fa2 | 562 | if (!iommu->notifier.head) { |
a54eb550 KW |
563 | ret = -EINVAL; |
564 | goto pin_done; | |
565 | } | |
566 | ||
567 | /* | |
568 | * If iommu capable domain exist in the container then all pages are | |
569 | * already pinned and accounted. Accouting should be done if there is no | |
570 | * iommu capable domain in the container. | |
571 | */ | |
572 | do_accounting = !IS_IOMMU_CAP_DOMAIN_IN_CONTAINER(iommu); | |
573 | ||
574 | for (i = 0; i < npage; i++) { | |
575 | dma_addr_t iova; | |
576 | struct vfio_pfn *vpfn; | |
577 | ||
578 | iova = user_pfn[i] << PAGE_SHIFT; | |
2b8bb1d7 | 579 | dma = vfio_find_dma(iommu, iova, PAGE_SIZE); |
a54eb550 KW |
580 | if (!dma) { |
581 | ret = -EINVAL; | |
582 | goto pin_unwind; | |
583 | } | |
584 | ||
585 | if ((dma->prot & prot) != prot) { | |
586 | ret = -EPERM; | |
587 | goto pin_unwind; | |
588 | } | |
589 | ||
590 | vpfn = vfio_iova_get_vfio_pfn(dma, iova); | |
591 | if (vpfn) { | |
592 | phys_pfn[i] = vpfn->pfn; | |
593 | continue; | |
594 | } | |
595 | ||
596 | remote_vaddr = dma->vaddr + iova - dma->iova; | |
597 | ret = vfio_pin_page_external(dma, remote_vaddr, &phys_pfn[i], | |
598 | do_accounting); | |
80dbe1fb | 599 | if (ret) |
a54eb550 | 600 | goto pin_unwind; |
a54eb550 KW |
601 | |
602 | ret = vfio_add_to_pfn_list(dma, iova, phys_pfn[i]); | |
603 | if (ret) { | |
604 | vfio_unpin_page_external(dma, iova, do_accounting); | |
605 | goto pin_unwind; | |
606 | } | |
607 | } | |
608 | ||
609 | ret = i; | |
610 | goto pin_done; | |
611 | ||
612 | pin_unwind: | |
613 | phys_pfn[i] = 0; | |
614 | for (j = 0; j < i; j++) { | |
615 | dma_addr_t iova; | |
616 | ||
617 | iova = user_pfn[j] << PAGE_SHIFT; | |
2b8bb1d7 | 618 | dma = vfio_find_dma(iommu, iova, PAGE_SIZE); |
a54eb550 KW |
619 | vfio_unpin_page_external(dma, iova, do_accounting); |
620 | phys_pfn[j] = 0; | |
621 | } | |
622 | pin_done: | |
623 | mutex_unlock(&iommu->lock); | |
624 | return ret; | |
625 | } | |
626 | ||
627 | static int vfio_iommu_type1_unpin_pages(void *iommu_data, | |
628 | unsigned long *user_pfn, | |
629 | int npage) | |
630 | { | |
631 | struct vfio_iommu *iommu = iommu_data; | |
632 | bool do_accounting; | |
633 | int i; | |
634 | ||
635 | if (!iommu || !user_pfn) | |
636 | return -EINVAL; | |
637 | ||
638 | /* Supported for v2 version only */ | |
639 | if (!iommu->v2) | |
640 | return -EACCES; | |
641 | ||
642 | mutex_lock(&iommu->lock); | |
643 | ||
a54eb550 KW |
644 | do_accounting = !IS_IOMMU_CAP_DOMAIN_IN_CONTAINER(iommu); |
645 | for (i = 0; i < npage; i++) { | |
646 | struct vfio_dma *dma; | |
647 | dma_addr_t iova; | |
648 | ||
649 | iova = user_pfn[i] << PAGE_SHIFT; | |
2b8bb1d7 | 650 | dma = vfio_find_dma(iommu, iova, PAGE_SIZE); |
a54eb550 KW |
651 | if (!dma) |
652 | goto unpin_exit; | |
653 | vfio_unpin_page_external(dma, iova, do_accounting); | |
654 | } | |
655 | ||
656 | unpin_exit: | |
657 | mutex_unlock(&iommu->lock); | |
658 | return i > npage ? npage : (i > 0 ? i : -EINVAL); | |
659 | } | |
660 | ||
6bd06f5a | 661 | static long vfio_sync_unpin(struct vfio_dma *dma, struct vfio_domain *domain, |
a7d20dc1 WD |
662 | struct list_head *regions, |
663 | struct iommu_iotlb_gather *iotlb_gather) | |
6bd06f5a SS |
664 | { |
665 | long unlocked = 0; | |
666 | struct vfio_regions *entry, *next; | |
667 | ||
a7d20dc1 | 668 | iommu_tlb_sync(domain->domain, iotlb_gather); |
6bd06f5a SS |
669 | |
670 | list_for_each_entry_safe(entry, next, regions, list) { | |
671 | unlocked += vfio_unpin_pages_remote(dma, | |
672 | entry->iova, | |
673 | entry->phys >> PAGE_SHIFT, | |
674 | entry->len >> PAGE_SHIFT, | |
675 | false); | |
676 | list_del(&entry->list); | |
677 | kfree(entry); | |
678 | } | |
679 | ||
680 | cond_resched(); | |
681 | ||
682 | return unlocked; | |
683 | } | |
684 | ||
685 | /* | |
686 | * Generally, VFIO needs to unpin remote pages after each IOTLB flush. | |
687 | * Therefore, when using IOTLB flush sync interface, VFIO need to keep track | |
688 | * of these regions (currently using a list). | |
689 | * | |
690 | * This value specifies maximum number of regions for each IOTLB flush sync. | |
691 | */ | |
692 | #define VFIO_IOMMU_TLB_SYNC_MAX 512 | |
693 | ||
694 | static size_t unmap_unpin_fast(struct vfio_domain *domain, | |
695 | struct vfio_dma *dma, dma_addr_t *iova, | |
696 | size_t len, phys_addr_t phys, long *unlocked, | |
697 | struct list_head *unmapped_list, | |
a7d20dc1 WD |
698 | int *unmapped_cnt, |
699 | struct iommu_iotlb_gather *iotlb_gather) | |
6bd06f5a SS |
700 | { |
701 | size_t unmapped = 0; | |
702 | struct vfio_regions *entry = kzalloc(sizeof(*entry), GFP_KERNEL); | |
703 | ||
704 | if (entry) { | |
a7d20dc1 WD |
705 | unmapped = iommu_unmap_fast(domain->domain, *iova, len, |
706 | iotlb_gather); | |
6bd06f5a SS |
707 | |
708 | if (!unmapped) { | |
709 | kfree(entry); | |
710 | } else { | |
6bd06f5a SS |
711 | entry->iova = *iova; |
712 | entry->phys = phys; | |
713 | entry->len = unmapped; | |
714 | list_add_tail(&entry->list, unmapped_list); | |
715 | ||
716 | *iova += unmapped; | |
717 | (*unmapped_cnt)++; | |
718 | } | |
719 | } | |
720 | ||
721 | /* | |
722 | * Sync if the number of fast-unmap regions hits the limit | |
723 | * or in case of errors. | |
724 | */ | |
725 | if (*unmapped_cnt >= VFIO_IOMMU_TLB_SYNC_MAX || !unmapped) { | |
a7d20dc1 WD |
726 | *unlocked += vfio_sync_unpin(dma, domain, unmapped_list, |
727 | iotlb_gather); | |
6bd06f5a SS |
728 | *unmapped_cnt = 0; |
729 | } | |
730 | ||
731 | return unmapped; | |
732 | } | |
733 | ||
734 | static size_t unmap_unpin_slow(struct vfio_domain *domain, | |
735 | struct vfio_dma *dma, dma_addr_t *iova, | |
736 | size_t len, phys_addr_t phys, | |
737 | long *unlocked) | |
738 | { | |
739 | size_t unmapped = iommu_unmap(domain->domain, *iova, len); | |
740 | ||
741 | if (unmapped) { | |
742 | *unlocked += vfio_unpin_pages_remote(dma, *iova, | |
743 | phys >> PAGE_SHIFT, | |
744 | unmapped >> PAGE_SHIFT, | |
745 | false); | |
746 | *iova += unmapped; | |
747 | cond_resched(); | |
748 | } | |
749 | return unmapped; | |
750 | } | |
751 | ||
a54eb550 KW |
752 | static long vfio_unmap_unpin(struct vfio_iommu *iommu, struct vfio_dma *dma, |
753 | bool do_accounting) | |
166fd7d9 | 754 | { |
1ef3e2bc AW |
755 | dma_addr_t iova = dma->iova, end = dma->iova + dma->size; |
756 | struct vfio_domain *domain, *d; | |
6bd06f5a | 757 | LIST_HEAD(unmapped_region_list); |
a7d20dc1 | 758 | struct iommu_iotlb_gather iotlb_gather; |
6bd06f5a | 759 | int unmapped_region_cnt = 0; |
166fd7d9 AW |
760 | long unlocked = 0; |
761 | ||
1ef3e2bc | 762 | if (!dma->size) |
a54eb550 KW |
763 | return 0; |
764 | ||
765 | if (!IS_IOMMU_CAP_DOMAIN_IN_CONTAINER(iommu)) | |
766 | return 0; | |
767 | ||
1ef3e2bc AW |
768 | /* |
769 | * We use the IOMMU to track the physical addresses, otherwise we'd | |
770 | * need a much more complicated tracking system. Unfortunately that | |
771 | * means we need to use one of the iommu domains to figure out the | |
772 | * pfns to unpin. The rest need to be unmapped in advance so we have | |
773 | * no iommu translations remaining when the pages are unpinned. | |
774 | */ | |
775 | domain = d = list_first_entry(&iommu->domain_list, | |
776 | struct vfio_domain, next); | |
777 | ||
c5e66887 | 778 | list_for_each_entry_continue(d, &iommu->domain_list, next) { |
1ef3e2bc | 779 | iommu_unmap(d->domain, dma->iova, dma->size); |
c5e66887 AW |
780 | cond_resched(); |
781 | } | |
1ef3e2bc | 782 | |
a7d20dc1 | 783 | iommu_iotlb_gather_init(&iotlb_gather); |
166fd7d9 | 784 | while (iova < end) { |
6fe1010d AW |
785 | size_t unmapped, len; |
786 | phys_addr_t phys, next; | |
166fd7d9 | 787 | |
1ef3e2bc | 788 | phys = iommu_iova_to_phys(domain->domain, iova); |
166fd7d9 AW |
789 | if (WARN_ON(!phys)) { |
790 | iova += PAGE_SIZE; | |
791 | continue; | |
73fa0d10 | 792 | } |
166fd7d9 | 793 | |
6fe1010d AW |
794 | /* |
795 | * To optimize for fewer iommu_unmap() calls, each of which | |
796 | * may require hardware cache flushing, try to find the | |
797 | * largest contiguous physical memory chunk to unmap. | |
798 | */ | |
799 | for (len = PAGE_SIZE; | |
800 | !domain->fgsp && iova + len < end; len += PAGE_SIZE) { | |
801 | next = iommu_iova_to_phys(domain->domain, iova + len); | |
802 | if (next != phys + len) | |
803 | break; | |
804 | } | |
805 | ||
6bd06f5a SS |
806 | /* |
807 | * First, try to use fast unmap/unpin. In case of failure, | |
808 | * switch to slow unmap/unpin path. | |
809 | */ | |
810 | unmapped = unmap_unpin_fast(domain, dma, &iova, len, phys, | |
811 | &unlocked, &unmapped_region_list, | |
a7d20dc1 WD |
812 | &unmapped_region_cnt, |
813 | &iotlb_gather); | |
6bd06f5a SS |
814 | if (!unmapped) { |
815 | unmapped = unmap_unpin_slow(domain, dma, &iova, len, | |
816 | phys, &unlocked); | |
817 | if (WARN_ON(!unmapped)) | |
818 | break; | |
819 | } | |
73fa0d10 | 820 | } |
166fd7d9 | 821 | |
a54eb550 | 822 | dma->iommu_mapped = false; |
6bd06f5a | 823 | |
a7d20dc1 WD |
824 | if (unmapped_region_cnt) { |
825 | unlocked += vfio_sync_unpin(dma, domain, &unmapped_region_list, | |
826 | &iotlb_gather); | |
827 | } | |
6bd06f5a | 828 | |
a54eb550 | 829 | if (do_accounting) { |
48d8476b | 830 | vfio_lock_acct(dma, -unlocked, true); |
a54eb550 KW |
831 | return 0; |
832 | } | |
833 | return unlocked; | |
73fa0d10 AW |
834 | } |
835 | ||
1ef3e2bc | 836 | static void vfio_remove_dma(struct vfio_iommu *iommu, struct vfio_dma *dma) |
73fa0d10 | 837 | { |
a54eb550 | 838 | vfio_unmap_unpin(iommu, dma, true); |
1ef3e2bc | 839 | vfio_unlink_dma(iommu, dma); |
8f0d5bb9 | 840 | put_task_struct(dma->task); |
1ef3e2bc | 841 | kfree(dma); |
49285593 | 842 | iommu->dma_avail++; |
1ef3e2bc | 843 | } |
73fa0d10 | 844 | |
1ef3e2bc AW |
845 | static unsigned long vfio_pgsize_bitmap(struct vfio_iommu *iommu) |
846 | { | |
847 | struct vfio_domain *domain; | |
4644321f | 848 | unsigned long bitmap = ULONG_MAX; |
166fd7d9 | 849 | |
1ef3e2bc AW |
850 | mutex_lock(&iommu->lock); |
851 | list_for_each_entry(domain, &iommu->domain_list, next) | |
d16e0faa | 852 | bitmap &= domain->domain->pgsize_bitmap; |
1ef3e2bc | 853 | mutex_unlock(&iommu->lock); |
73fa0d10 | 854 | |
4644321f EA |
855 | /* |
856 | * In case the IOMMU supports page sizes smaller than PAGE_SIZE | |
857 | * we pretend PAGE_SIZE is supported and hide sub-PAGE_SIZE sizes. | |
858 | * That way the user will be able to map/unmap buffers whose size/ | |
859 | * start address is aligned with PAGE_SIZE. Pinning code uses that | |
860 | * granularity while iommu driver can use the sub-PAGE_SIZE size | |
861 | * to map the buffer. | |
862 | */ | |
863 | if (bitmap & ~PAGE_MASK) { | |
864 | bitmap &= PAGE_MASK; | |
865 | bitmap |= PAGE_SIZE; | |
866 | } | |
867 | ||
1ef3e2bc | 868 | return bitmap; |
73fa0d10 AW |
869 | } |
870 | ||
871 | static int vfio_dma_do_unmap(struct vfio_iommu *iommu, | |
872 | struct vfio_iommu_type1_dma_unmap *unmap) | |
873 | { | |
73fa0d10 | 874 | uint64_t mask; |
c086de81 | 875 | struct vfio_dma *dma, *dma_last = NULL; |
1ef3e2bc | 876 | size_t unmapped = 0; |
c086de81 | 877 | int ret = 0, retries = 0; |
73fa0d10 | 878 | |
1ef3e2bc | 879 | mask = ((uint64_t)1 << __ffs(vfio_pgsize_bitmap(iommu))) - 1; |
73fa0d10 AW |
880 | |
881 | if (unmap->iova & mask) | |
882 | return -EINVAL; | |
f5bfdbf2 | 883 | if (!unmap->size || unmap->size & mask) |
73fa0d10 | 884 | return -EINVAL; |
58fec830 | 885 | if (unmap->iova + unmap->size - 1 < unmap->iova || |
71a7d3d7 DC |
886 | unmap->size > SIZE_MAX) |
887 | return -EINVAL; | |
73fa0d10 | 888 | |
73fa0d10 | 889 | WARN_ON(mask & PAGE_MASK); |
c086de81 | 890 | again: |
73fa0d10 AW |
891 | mutex_lock(&iommu->lock); |
892 | ||
1ef3e2bc AW |
893 | /* |
894 | * vfio-iommu-type1 (v1) - User mappings were coalesced together to | |
895 | * avoid tracking individual mappings. This means that the granularity | |
896 | * of the original mapping was lost and the user was allowed to attempt | |
897 | * to unmap any range. Depending on the contiguousness of physical | |
898 | * memory and page sizes supported by the IOMMU, arbitrary unmaps may | |
899 | * or may not have worked. We only guaranteed unmap granularity | |
900 | * matching the original mapping; even though it was untracked here, | |
901 | * the original mappings are reflected in IOMMU mappings. This | |
902 | * resulted in a couple unusual behaviors. First, if a range is not | |
903 | * able to be unmapped, ex. a set of 4k pages that was mapped as a | |
904 | * 2M hugepage into the IOMMU, the unmap ioctl returns success but with | |
905 | * a zero sized unmap. Also, if an unmap request overlaps the first | |
906 | * address of a hugepage, the IOMMU will unmap the entire hugepage. | |
907 | * This also returns success and the returned unmap size reflects the | |
908 | * actual size unmapped. | |
909 | * | |
910 | * We attempt to maintain compatibility with this "v1" interface, but | |
911 | * we take control out of the hands of the IOMMU. Therefore, an unmap | |
912 | * request offset from the beginning of the original mapping will | |
913 | * return success with zero sized unmap. And an unmap request covering | |
914 | * the first iova of mapping will unmap the entire range. | |
915 | * | |
916 | * The v2 version of this interface intends to be more deterministic. | |
917 | * Unmap requests must fully cover previous mappings. Multiple | |
918 | * mappings may still be unmaped by specifying large ranges, but there | |
919 | * must not be any previous mappings bisected by the range. An error | |
920 | * will be returned if these conditions are not met. The v2 interface | |
921 | * will only return success and a size of zero if there were no | |
922 | * mappings within the range. | |
923 | */ | |
924 | if (iommu->v2) { | |
7c03f428 | 925 | dma = vfio_find_dma(iommu, unmap->iova, 1); |
1ef3e2bc AW |
926 | if (dma && dma->iova != unmap->iova) { |
927 | ret = -EINVAL; | |
928 | goto unlock; | |
929 | } | |
930 | dma = vfio_find_dma(iommu, unmap->iova + unmap->size - 1, 0); | |
931 | if (dma && dma->iova + dma->size != unmap->iova + unmap->size) { | |
932 | ret = -EINVAL; | |
933 | goto unlock; | |
934 | } | |
935 | } | |
936 | ||
166fd7d9 | 937 | while ((dma = vfio_find_dma(iommu, unmap->iova, unmap->size))) { |
1ef3e2bc | 938 | if (!iommu->v2 && unmap->iova > dma->iova) |
166fd7d9 | 939 | break; |
8f0d5bb9 KW |
940 | /* |
941 | * Task with same address space who mapped this iova range is | |
942 | * allowed to unmap the iova range. | |
943 | */ | |
944 | if (dma->task->mm != current->mm) | |
945 | break; | |
c086de81 KW |
946 | |
947 | if (!RB_EMPTY_ROOT(&dma->pfn_list)) { | |
948 | struct vfio_iommu_type1_dma_unmap nb_unmap; | |
949 | ||
950 | if (dma_last == dma) { | |
951 | BUG_ON(++retries > 10); | |
952 | } else { | |
953 | dma_last = dma; | |
954 | retries = 0; | |
955 | } | |
956 | ||
957 | nb_unmap.iova = dma->iova; | |
958 | nb_unmap.size = dma->size; | |
959 | ||
960 | /* | |
961 | * Notify anyone (mdev vendor drivers) to invalidate and | |
962 | * unmap iovas within the range we're about to unmap. | |
963 | * Vendor drivers MUST unpin pages in response to an | |
964 | * invalidation. | |
965 | */ | |
966 | mutex_unlock(&iommu->lock); | |
967 | blocking_notifier_call_chain(&iommu->notifier, | |
968 | VFIO_IOMMU_NOTIFY_DMA_UNMAP, | |
969 | &nb_unmap); | |
970 | goto again; | |
971 | } | |
1ef3e2bc AW |
972 | unmapped += dma->size; |
973 | vfio_remove_dma(iommu, dma); | |
166fd7d9 | 974 | } |
cd9b2268 | 975 | |
1ef3e2bc | 976 | unlock: |
73fa0d10 | 977 | mutex_unlock(&iommu->lock); |
166fd7d9 | 978 | |
1ef3e2bc | 979 | /* Report how much was unmapped */ |
166fd7d9 AW |
980 | unmap->size = unmapped; |
981 | ||
982 | return ret; | |
983 | } | |
984 | ||
1ef3e2bc AW |
985 | static int vfio_iommu_map(struct vfio_iommu *iommu, dma_addr_t iova, |
986 | unsigned long pfn, long npage, int prot) | |
987 | { | |
988 | struct vfio_domain *d; | |
989 | int ret; | |
990 | ||
991 | list_for_each_entry(d, &iommu->domain_list, next) { | |
992 | ret = iommu_map(d->domain, iova, (phys_addr_t)pfn << PAGE_SHIFT, | |
993 | npage << PAGE_SHIFT, prot | d->prot); | |
7a30423a JR |
994 | if (ret) |
995 | goto unwind; | |
c5e66887 AW |
996 | |
997 | cond_resched(); | |
1ef3e2bc AW |
998 | } |
999 | ||
1000 | return 0; | |
1001 | ||
1002 | unwind: | |
1003 | list_for_each_entry_continue_reverse(d, &iommu->domain_list, next) | |
1004 | iommu_unmap(d->domain, iova, npage << PAGE_SHIFT); | |
166fd7d9 | 1005 | |
cd9b2268 | 1006 | return ret; |
73fa0d10 AW |
1007 | } |
1008 | ||
8f0d5bb9 KW |
1009 | static int vfio_pin_map_dma(struct vfio_iommu *iommu, struct vfio_dma *dma, |
1010 | size_t map_size) | |
1011 | { | |
1012 | dma_addr_t iova = dma->iova; | |
1013 | unsigned long vaddr = dma->vaddr; | |
1014 | size_t size = map_size; | |
1015 | long npage; | |
7cb671e7 | 1016 | unsigned long pfn, limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; |
8f0d5bb9 KW |
1017 | int ret = 0; |
1018 | ||
1019 | while (size) { | |
1020 | /* Pin a contiguous chunk of memory */ | |
1021 | npage = vfio_pin_pages_remote(dma, vaddr + dma->size, | |
48d8476b | 1022 | size >> PAGE_SHIFT, &pfn, limit); |
8f0d5bb9 KW |
1023 | if (npage <= 0) { |
1024 | WARN_ON(!npage); | |
1025 | ret = (int)npage; | |
1026 | break; | |
1027 | } | |
1028 | ||
1029 | /* Map it! */ | |
1030 | ret = vfio_iommu_map(iommu, iova + dma->size, pfn, npage, | |
1031 | dma->prot); | |
1032 | if (ret) { | |
a54eb550 KW |
1033 | vfio_unpin_pages_remote(dma, iova + dma->size, pfn, |
1034 | npage, true); | |
8f0d5bb9 KW |
1035 | break; |
1036 | } | |
1037 | ||
1038 | size -= npage << PAGE_SHIFT; | |
1039 | dma->size += npage << PAGE_SHIFT; | |
1040 | } | |
1041 | ||
a54eb550 KW |
1042 | dma->iommu_mapped = true; |
1043 | ||
8f0d5bb9 KW |
1044 | if (ret) |
1045 | vfio_remove_dma(iommu, dma); | |
1046 | ||
1047 | return ret; | |
1048 | } | |
1049 | ||
9b77e5c7 SK |
1050 | /* |
1051 | * Check dma map request is within a valid iova range | |
1052 | */ | |
1053 | static bool vfio_iommu_iova_dma_valid(struct vfio_iommu *iommu, | |
1054 | dma_addr_t start, dma_addr_t end) | |
1055 | { | |
1056 | struct list_head *iova = &iommu->iova_list; | |
1057 | struct vfio_iova *node; | |
1058 | ||
1059 | list_for_each_entry(node, iova, list) { | |
1060 | if (start >= node->start && end <= node->end) | |
1061 | return true; | |
1062 | } | |
1063 | ||
1064 | /* | |
1065 | * Check for list_empty() as well since a container with | |
1066 | * a single mdev device will have an empty list. | |
1067 | */ | |
1068 | return list_empty(iova); | |
1069 | } | |
1070 | ||
73fa0d10 AW |
1071 | static int vfio_dma_do_map(struct vfio_iommu *iommu, |
1072 | struct vfio_iommu_type1_dma_map *map) | |
1073 | { | |
c8dbca16 | 1074 | dma_addr_t iova = map->iova; |
166fd7d9 | 1075 | unsigned long vaddr = map->vaddr; |
73fa0d10 AW |
1076 | size_t size = map->size; |
1077 | int ret = 0, prot = 0; | |
1078 | uint64_t mask; | |
1ef3e2bc | 1079 | struct vfio_dma *dma; |
166fd7d9 | 1080 | |
c8dbca16 AW |
1081 | /* Verify that none of our __u64 fields overflow */ |
1082 | if (map->size != size || map->vaddr != vaddr || map->iova != iova) | |
1083 | return -EINVAL; | |
73fa0d10 | 1084 | |
1ef3e2bc | 1085 | mask = ((uint64_t)1 << __ffs(vfio_pgsize_bitmap(iommu))) - 1; |
73fa0d10 | 1086 | |
c8dbca16 AW |
1087 | WARN_ON(mask & PAGE_MASK); |
1088 | ||
73fa0d10 AW |
1089 | /* READ/WRITE from device perspective */ |
1090 | if (map->flags & VFIO_DMA_MAP_FLAG_WRITE) | |
1091 | prot |= IOMMU_WRITE; | |
1092 | if (map->flags & VFIO_DMA_MAP_FLAG_READ) | |
1093 | prot |= IOMMU_READ; | |
1094 | ||
c8dbca16 | 1095 | if (!prot || !size || (size | iova | vaddr) & mask) |
73fa0d10 AW |
1096 | return -EINVAL; |
1097 | ||
c8dbca16 AW |
1098 | /* Don't allow IOVA or virtual address wrap */ |
1099 | if (iova + size - 1 < iova || vaddr + size - 1 < vaddr) | |
73fa0d10 AW |
1100 | return -EINVAL; |
1101 | ||
1102 | mutex_lock(&iommu->lock); | |
1103 | ||
c8dbca16 | 1104 | if (vfio_find_dma(iommu, iova, size)) { |
8f0d5bb9 KW |
1105 | ret = -EEXIST; |
1106 | goto out_unlock; | |
73fa0d10 AW |
1107 | } |
1108 | ||
49285593 AW |
1109 | if (!iommu->dma_avail) { |
1110 | ret = -ENOSPC; | |
1111 | goto out_unlock; | |
1112 | } | |
1113 | ||
9b77e5c7 SK |
1114 | if (!vfio_iommu_iova_dma_valid(iommu, iova, iova + size - 1)) { |
1115 | ret = -EINVAL; | |
1116 | goto out_unlock; | |
1117 | } | |
1118 | ||
1ef3e2bc AW |
1119 | dma = kzalloc(sizeof(*dma), GFP_KERNEL); |
1120 | if (!dma) { | |
8f0d5bb9 KW |
1121 | ret = -ENOMEM; |
1122 | goto out_unlock; | |
1ef3e2bc AW |
1123 | } |
1124 | ||
49285593 | 1125 | iommu->dma_avail--; |
c8dbca16 AW |
1126 | dma->iova = iova; |
1127 | dma->vaddr = vaddr; | |
1ef3e2bc | 1128 | dma->prot = prot; |
48d8476b AW |
1129 | |
1130 | /* | |
1131 | * We need to be able to both add to a task's locked memory and test | |
1132 | * against the locked memory limit and we need to be able to do both | |
1133 | * outside of this call path as pinning can be asynchronous via the | |
1134 | * external interfaces for mdev devices. RLIMIT_MEMLOCK requires a | |
1135 | * task_struct and VM locked pages requires an mm_struct, however | |
1136 | * holding an indefinite mm reference is not recommended, therefore we | |
1137 | * only hold a reference to a task. We could hold a reference to | |
1138 | * current, however QEMU uses this call path through vCPU threads, | |
1139 | * which can be killed resulting in a NULL mm and failure in the unmap | |
1140 | * path when called via a different thread. Avoid this problem by | |
1141 | * using the group_leader as threads within the same group require | |
1142 | * both CLONE_THREAD and CLONE_VM and will therefore use the same | |
1143 | * mm_struct. | |
1144 | * | |
1145 | * Previously we also used the task for testing CAP_IPC_LOCK at the | |
1146 | * time of pinning and accounting, however has_capability() makes use | |
1147 | * of real_cred, a copy-on-write field, so we can't guarantee that it | |
1148 | * matches group_leader, or in fact that it might not change by the | |
1149 | * time it's evaluated. If a process were to call MAP_DMA with | |
1150 | * CAP_IPC_LOCK but later drop it, it doesn't make sense that they | |
1151 | * possibly see different results for an iommu_mapped vfio_dma vs | |
1152 | * externally mapped. Therefore track CAP_IPC_LOCK in vfio_dma at the | |
1153 | * time of calling MAP_DMA. | |
1154 | */ | |
1155 | get_task_struct(current->group_leader); | |
1156 | dma->task = current->group_leader; | |
1157 | dma->lock_cap = capable(CAP_IPC_LOCK); | |
1158 | ||
a54eb550 | 1159 | dma->pfn_list = RB_ROOT; |
166fd7d9 | 1160 | |
1ef3e2bc AW |
1161 | /* Insert zero-sized and grow as we map chunks of it */ |
1162 | vfio_link_dma(iommu, dma); | |
166fd7d9 | 1163 | |
a54eb550 KW |
1164 | /* Don't pin and map if container doesn't contain IOMMU capable domain*/ |
1165 | if (!IS_IOMMU_CAP_DOMAIN_IN_CONTAINER(iommu)) | |
1166 | dma->size = size; | |
1167 | else | |
1168 | ret = vfio_pin_map_dma(iommu, dma, size); | |
1169 | ||
8f0d5bb9 | 1170 | out_unlock: |
1ef3e2bc AW |
1171 | mutex_unlock(&iommu->lock); |
1172 | return ret; | |
1173 | } | |
1174 | ||
1175 | static int vfio_bus_type(struct device *dev, void *data) | |
1176 | { | |
1177 | struct bus_type **bus = data; | |
1178 | ||
1179 | if (*bus && *bus != dev->bus) | |
1180 | return -EINVAL; | |
1181 | ||
1182 | *bus = dev->bus; | |
1183 | ||
1184 | return 0; | |
1185 | } | |
1186 | ||
1187 | static int vfio_iommu_replay(struct vfio_iommu *iommu, | |
1188 | struct vfio_domain *domain) | |
1189 | { | |
1190 | struct vfio_domain *d; | |
1191 | struct rb_node *n; | |
7cb671e7 | 1192 | unsigned long limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; |
1ef3e2bc AW |
1193 | int ret; |
1194 | ||
1195 | /* Arbitrarily pick the first domain in the list for lookups */ | |
1196 | d = list_first_entry(&iommu->domain_list, struct vfio_domain, next); | |
1197 | n = rb_first(&iommu->dma_list); | |
1198 | ||
1ef3e2bc AW |
1199 | for (; n; n = rb_next(n)) { |
1200 | struct vfio_dma *dma; | |
1201 | dma_addr_t iova; | |
1202 | ||
1203 | dma = rb_entry(n, struct vfio_dma, node); | |
1204 | iova = dma->iova; | |
1205 | ||
1206 | while (iova < dma->iova + dma->size) { | |
a54eb550 | 1207 | phys_addr_t phys; |
1ef3e2bc | 1208 | size_t size; |
73fa0d10 | 1209 | |
a54eb550 KW |
1210 | if (dma->iommu_mapped) { |
1211 | phys_addr_t p; | |
1212 | dma_addr_t i; | |
1213 | ||
1214 | phys = iommu_iova_to_phys(d->domain, iova); | |
1215 | ||
1216 | if (WARN_ON(!phys)) { | |
1217 | iova += PAGE_SIZE; | |
1218 | continue; | |
1219 | } | |
1220 | ||
1221 | size = PAGE_SIZE; | |
1222 | p = phys + size; | |
1223 | i = iova + size; | |
1224 | while (i < dma->iova + dma->size && | |
1225 | p == iommu_iova_to_phys(d->domain, i)) { | |
1226 | size += PAGE_SIZE; | |
1227 | p += PAGE_SIZE; | |
1228 | i += PAGE_SIZE; | |
1229 | } | |
1230 | } else { | |
1231 | unsigned long pfn; | |
1232 | unsigned long vaddr = dma->vaddr + | |
1233 | (iova - dma->iova); | |
1234 | size_t n = dma->iova + dma->size - iova; | |
1235 | long npage; | |
1236 | ||
1237 | npage = vfio_pin_pages_remote(dma, vaddr, | |
1238 | n >> PAGE_SHIFT, | |
48d8476b | 1239 | &pfn, limit); |
a54eb550 KW |
1240 | if (npage <= 0) { |
1241 | WARN_ON(!npage); | |
1242 | ret = (int)npage; | |
1243 | return ret; | |
1244 | } | |
1245 | ||
1246 | phys = pfn << PAGE_SHIFT; | |
1247 | size = npage << PAGE_SHIFT; | |
166fd7d9 AW |
1248 | } |
1249 | ||
1ef3e2bc AW |
1250 | ret = iommu_map(domain->domain, iova, phys, |
1251 | size, dma->prot | domain->prot); | |
1252 | if (ret) | |
1253 | return ret; | |
d93b3ac0 | 1254 | |
1ef3e2bc AW |
1255 | iova += size; |
1256 | } | |
a54eb550 | 1257 | dma->iommu_mapped = true; |
166fd7d9 | 1258 | } |
1ef3e2bc | 1259 | return 0; |
73fa0d10 AW |
1260 | } |
1261 | ||
6fe1010d AW |
1262 | /* |
1263 | * We change our unmap behavior slightly depending on whether the IOMMU | |
1264 | * supports fine-grained superpages. IOMMUs like AMD-Vi will use a superpage | |
1265 | * for practically any contiguous power-of-two mapping we give it. This means | |
1266 | * we don't need to look for contiguous chunks ourselves to make unmapping | |
1267 | * more efficient. On IOMMUs with coarse-grained super pages, like Intel VT-d | |
1268 | * with discrete 2M/1G/512G/1T superpages, identifying contiguous chunks | |
1269 | * significantly boosts non-hugetlbfs mappings and doesn't seem to hurt when | |
1270 | * hugetlbfs is in use. | |
1271 | */ | |
1272 | static void vfio_test_domain_fgsp(struct vfio_domain *domain) | |
1273 | { | |
1274 | struct page *pages; | |
1275 | int ret, order = get_order(PAGE_SIZE * 2); | |
1276 | ||
1277 | pages = alloc_pages(GFP_KERNEL | __GFP_ZERO, order); | |
1278 | if (!pages) | |
1279 | return; | |
1280 | ||
1281 | ret = iommu_map(domain->domain, 0, page_to_phys(pages), PAGE_SIZE * 2, | |
1282 | IOMMU_READ | IOMMU_WRITE | domain->prot); | |
1283 | if (!ret) { | |
1284 | size_t unmapped = iommu_unmap(domain->domain, 0, PAGE_SIZE); | |
1285 | ||
1286 | if (unmapped == PAGE_SIZE) | |
1287 | iommu_unmap(domain->domain, PAGE_SIZE, PAGE_SIZE); | |
1288 | else | |
1289 | domain->fgsp = true; | |
1290 | } | |
1291 | ||
1292 | __free_pages(pages, order); | |
1293 | } | |
1294 | ||
7896c998 KW |
1295 | static struct vfio_group *find_iommu_group(struct vfio_domain *domain, |
1296 | struct iommu_group *iommu_group) | |
1297 | { | |
1298 | struct vfio_group *g; | |
1299 | ||
1300 | list_for_each_entry(g, &domain->group_list, next) { | |
1301 | if (g->iommu_group == iommu_group) | |
1302 | return g; | |
1303 | } | |
1304 | ||
1305 | return NULL; | |
1306 | } | |
1307 | ||
b09d6e47 SK |
1308 | static bool vfio_iommu_has_sw_msi(struct list_head *group_resv_regions, |
1309 | phys_addr_t *base) | |
5d704992 | 1310 | { |
b09d6e47 | 1311 | struct iommu_resv_region *region; |
5d704992 EA |
1312 | bool ret = false; |
1313 | ||
b09d6e47 | 1314 | list_for_each_entry(region, group_resv_regions, list) { |
f203f7f1 RM |
1315 | /* |
1316 | * The presence of any 'real' MSI regions should take | |
1317 | * precedence over the software-managed one if the | |
1318 | * IOMMU driver happens to advertise both types. | |
1319 | */ | |
1320 | if (region->type == IOMMU_RESV_MSI) { | |
1321 | ret = false; | |
1322 | break; | |
1323 | } | |
1324 | ||
9d3a4de4 | 1325 | if (region->type == IOMMU_RESV_SW_MSI) { |
5d704992 EA |
1326 | *base = region->start; |
1327 | ret = true; | |
5d704992 EA |
1328 | } |
1329 | } | |
b09d6e47 | 1330 | |
5d704992 EA |
1331 | return ret; |
1332 | } | |
1333 | ||
7bd50f0c LB |
1334 | static struct device *vfio_mdev_get_iommu_device(struct device *dev) |
1335 | { | |
1336 | struct device *(*fn)(struct device *dev); | |
1337 | struct device *iommu_device; | |
1338 | ||
1339 | fn = symbol_get(mdev_get_iommu_device); | |
1340 | if (fn) { | |
1341 | iommu_device = fn(dev); | |
1342 | symbol_put(mdev_get_iommu_device); | |
1343 | ||
1344 | return iommu_device; | |
1345 | } | |
1346 | ||
1347 | return NULL; | |
1348 | } | |
1349 | ||
1350 | static int vfio_mdev_attach_domain(struct device *dev, void *data) | |
1351 | { | |
1352 | struct iommu_domain *domain = data; | |
1353 | struct device *iommu_device; | |
1354 | ||
1355 | iommu_device = vfio_mdev_get_iommu_device(dev); | |
1356 | if (iommu_device) { | |
1357 | if (iommu_dev_feature_enabled(iommu_device, IOMMU_DEV_FEAT_AUX)) | |
1358 | return iommu_aux_attach_device(domain, iommu_device); | |
1359 | else | |
1360 | return iommu_attach_device(domain, iommu_device); | |
1361 | } | |
1362 | ||
1363 | return -EINVAL; | |
1364 | } | |
1365 | ||
1366 | static int vfio_mdev_detach_domain(struct device *dev, void *data) | |
1367 | { | |
1368 | struct iommu_domain *domain = data; | |
1369 | struct device *iommu_device; | |
1370 | ||
1371 | iommu_device = vfio_mdev_get_iommu_device(dev); | |
1372 | if (iommu_device) { | |
1373 | if (iommu_dev_feature_enabled(iommu_device, IOMMU_DEV_FEAT_AUX)) | |
1374 | iommu_aux_detach_device(domain, iommu_device); | |
1375 | else | |
1376 | iommu_detach_device(domain, iommu_device); | |
1377 | } | |
1378 | ||
1379 | return 0; | |
1380 | } | |
1381 | ||
1382 | static int vfio_iommu_attach_group(struct vfio_domain *domain, | |
1383 | struct vfio_group *group) | |
1384 | { | |
1385 | if (group->mdev_group) | |
1386 | return iommu_group_for_each_dev(group->iommu_group, | |
1387 | domain->domain, | |
1388 | vfio_mdev_attach_domain); | |
1389 | else | |
1390 | return iommu_attach_group(domain->domain, group->iommu_group); | |
1391 | } | |
1392 | ||
1393 | static void vfio_iommu_detach_group(struct vfio_domain *domain, | |
1394 | struct vfio_group *group) | |
1395 | { | |
1396 | if (group->mdev_group) | |
1397 | iommu_group_for_each_dev(group->iommu_group, domain->domain, | |
1398 | vfio_mdev_detach_domain); | |
1399 | else | |
1400 | iommu_detach_group(domain->domain, group->iommu_group); | |
1401 | } | |
1402 | ||
be068fa2 LB |
1403 | static bool vfio_bus_is_mdev(struct bus_type *bus) |
1404 | { | |
1405 | struct bus_type *mdev_bus; | |
1406 | bool ret = false; | |
1407 | ||
1408 | mdev_bus = symbol_get(mdev_bus_type); | |
1409 | if (mdev_bus) { | |
1410 | ret = (bus == mdev_bus); | |
1411 | symbol_put(mdev_bus_type); | |
1412 | } | |
1413 | ||
1414 | return ret; | |
1415 | } | |
1416 | ||
1417 | static int vfio_mdev_iommu_device(struct device *dev, void *data) | |
1418 | { | |
1419 | struct device **old = data, *new; | |
1420 | ||
1421 | new = vfio_mdev_get_iommu_device(dev); | |
1422 | if (!new || (*old && *old != new)) | |
1423 | return -EINVAL; | |
1424 | ||
1425 | *old = new; | |
1426 | ||
1427 | return 0; | |
1428 | } | |
1429 | ||
1108696a SK |
1430 | /* |
1431 | * This is a helper function to insert an address range to iova list. | |
1432 | * The list is initially created with a single entry corresponding to | |
1433 | * the IOMMU domain geometry to which the device group is attached. | |
1434 | * The list aperture gets modified when a new domain is added to the | |
1435 | * container if the new aperture doesn't conflict with the current one | |
1436 | * or with any existing dma mappings. The list is also modified to | |
1437 | * exclude any reserved regions associated with the device group. | |
1438 | */ | |
1439 | static int vfio_iommu_iova_insert(struct list_head *head, | |
1440 | dma_addr_t start, dma_addr_t end) | |
1441 | { | |
1442 | struct vfio_iova *region; | |
1443 | ||
1444 | region = kmalloc(sizeof(*region), GFP_KERNEL); | |
1445 | if (!region) | |
1446 | return -ENOMEM; | |
1447 | ||
1448 | INIT_LIST_HEAD(®ion->list); | |
1449 | region->start = start; | |
1450 | region->end = end; | |
1451 | ||
1452 | list_add_tail(®ion->list, head); | |
1453 | return 0; | |
1454 | } | |
1455 | ||
1456 | /* | |
1457 | * Check the new iommu aperture conflicts with existing aper or with any | |
1458 | * existing dma mappings. | |
1459 | */ | |
1460 | static bool vfio_iommu_aper_conflict(struct vfio_iommu *iommu, | |
1461 | dma_addr_t start, dma_addr_t end) | |
1462 | { | |
1463 | struct vfio_iova *first, *last; | |
1464 | struct list_head *iova = &iommu->iova_list; | |
1465 | ||
1466 | if (list_empty(iova)) | |
1467 | return false; | |
1468 | ||
1469 | /* Disjoint sets, return conflict */ | |
1470 | first = list_first_entry(iova, struct vfio_iova, list); | |
1471 | last = list_last_entry(iova, struct vfio_iova, list); | |
1472 | if (start > last->end || end < first->start) | |
1473 | return true; | |
1474 | ||
1475 | /* Check for any existing dma mappings below the new start */ | |
1476 | if (start > first->start) { | |
1477 | if (vfio_find_dma(iommu, first->start, start - first->start)) | |
1478 | return true; | |
1479 | } | |
1480 | ||
1481 | /* Check for any existing dma mappings beyond the new end */ | |
1482 | if (end < last->end) { | |
1483 | if (vfio_find_dma(iommu, end + 1, last->end - end)) | |
1484 | return true; | |
1485 | } | |
1486 | ||
1487 | return false; | |
1488 | } | |
1489 | ||
1490 | /* | |
1491 | * Resize iommu iova aperture window. This is called only if the new | |
1492 | * aperture has no conflict with existing aperture and dma mappings. | |
1493 | */ | |
1494 | static int vfio_iommu_aper_resize(struct list_head *iova, | |
1495 | dma_addr_t start, dma_addr_t end) | |
1496 | { | |
1497 | struct vfio_iova *node, *next; | |
1498 | ||
1499 | if (list_empty(iova)) | |
1500 | return vfio_iommu_iova_insert(iova, start, end); | |
1501 | ||
1502 | /* Adjust iova list start */ | |
1503 | list_for_each_entry_safe(node, next, iova, list) { | |
1504 | if (start < node->start) | |
1505 | break; | |
1506 | if (start >= node->start && start < node->end) { | |
1507 | node->start = start; | |
1508 | break; | |
1509 | } | |
1510 | /* Delete nodes before new start */ | |
1511 | list_del(&node->list); | |
1512 | kfree(node); | |
1513 | } | |
1514 | ||
1515 | /* Adjust iova list end */ | |
1516 | list_for_each_entry_safe(node, next, iova, list) { | |
1517 | if (end > node->end) | |
1518 | continue; | |
1519 | if (end > node->start && end <= node->end) { | |
1520 | node->end = end; | |
1521 | continue; | |
1522 | } | |
1523 | /* Delete nodes after new end */ | |
1524 | list_del(&node->list); | |
1525 | kfree(node); | |
1526 | } | |
1527 | ||
1528 | return 0; | |
1529 | } | |
1530 | ||
af029169 SK |
1531 | /* |
1532 | * Check reserved region conflicts with existing dma mappings | |
1533 | */ | |
1534 | static bool vfio_iommu_resv_conflict(struct vfio_iommu *iommu, | |
1535 | struct list_head *resv_regions) | |
1536 | { | |
1537 | struct iommu_resv_region *region; | |
1538 | ||
1539 | /* Check for conflict with existing dma mappings */ | |
1540 | list_for_each_entry(region, resv_regions, list) { | |
1541 | if (region->type == IOMMU_RESV_DIRECT_RELAXABLE) | |
1542 | continue; | |
1543 | ||
1544 | if (vfio_find_dma(iommu, region->start, region->length)) | |
1545 | return true; | |
1546 | } | |
1547 | ||
1548 | return false; | |
1549 | } | |
1550 | ||
1551 | /* | |
1552 | * Check iova region overlap with reserved regions and | |
1553 | * exclude them from the iommu iova range | |
1554 | */ | |
1555 | static int vfio_iommu_resv_exclude(struct list_head *iova, | |
1556 | struct list_head *resv_regions) | |
1557 | { | |
1558 | struct iommu_resv_region *resv; | |
1559 | struct vfio_iova *n, *next; | |
1560 | ||
1561 | list_for_each_entry(resv, resv_regions, list) { | |
1562 | phys_addr_t start, end; | |
1563 | ||
1564 | if (resv->type == IOMMU_RESV_DIRECT_RELAXABLE) | |
1565 | continue; | |
1566 | ||
1567 | start = resv->start; | |
1568 | end = resv->start + resv->length - 1; | |
1569 | ||
1570 | list_for_each_entry_safe(n, next, iova, list) { | |
1571 | int ret = 0; | |
1572 | ||
1573 | /* No overlap */ | |
1574 | if (start > n->end || end < n->start) | |
1575 | continue; | |
1576 | /* | |
1577 | * Insert a new node if current node overlaps with the | |
1578 | * reserve region to exlude that from valid iova range. | |
1579 | * Note that, new node is inserted before the current | |
1580 | * node and finally the current node is deleted keeping | |
1581 | * the list updated and sorted. | |
1582 | */ | |
1583 | if (start > n->start) | |
1584 | ret = vfio_iommu_iova_insert(&n->list, n->start, | |
1585 | start - 1); | |
1586 | if (!ret && end < n->end) | |
1587 | ret = vfio_iommu_iova_insert(&n->list, end + 1, | |
1588 | n->end); | |
1589 | if (ret) | |
1590 | return ret; | |
1591 | ||
1592 | list_del(&n->list); | |
1593 | kfree(n); | |
1594 | } | |
1595 | } | |
1596 | ||
1597 | if (list_empty(iova)) | |
1598 | return -EINVAL; | |
1599 | ||
1600 | return 0; | |
1601 | } | |
1602 | ||
1603 | static void vfio_iommu_resv_free(struct list_head *resv_regions) | |
1604 | { | |
1605 | struct iommu_resv_region *n, *next; | |
1606 | ||
1607 | list_for_each_entry_safe(n, next, resv_regions, list) { | |
1608 | list_del(&n->list); | |
1609 | kfree(n); | |
1610 | } | |
1611 | } | |
1612 | ||
1108696a SK |
1613 | static void vfio_iommu_iova_free(struct list_head *iova) |
1614 | { | |
1615 | struct vfio_iova *n, *next; | |
1616 | ||
1617 | list_for_each_entry_safe(n, next, iova, list) { | |
1618 | list_del(&n->list); | |
1619 | kfree(n); | |
1620 | } | |
1621 | } | |
1622 | ||
1623 | static int vfio_iommu_iova_get_copy(struct vfio_iommu *iommu, | |
1624 | struct list_head *iova_copy) | |
1625 | { | |
1626 | struct list_head *iova = &iommu->iova_list; | |
1627 | struct vfio_iova *n; | |
1628 | int ret; | |
1629 | ||
1630 | list_for_each_entry(n, iova, list) { | |
1631 | ret = vfio_iommu_iova_insert(iova_copy, n->start, n->end); | |
1632 | if (ret) | |
1633 | goto out_free; | |
1634 | } | |
1635 | ||
1636 | return 0; | |
1637 | ||
1638 | out_free: | |
1639 | vfio_iommu_iova_free(iova_copy); | |
1640 | return ret; | |
1641 | } | |
1642 | ||
1643 | static void vfio_iommu_iova_insert_copy(struct vfio_iommu *iommu, | |
1644 | struct list_head *iova_copy) | |
1645 | { | |
1646 | struct list_head *iova = &iommu->iova_list; | |
1647 | ||
1648 | vfio_iommu_iova_free(iova); | |
1649 | ||
1650 | list_splice_tail(iova_copy, iova); | |
1651 | } | |
73fa0d10 AW |
1652 | static int vfio_iommu_type1_attach_group(void *iommu_data, |
1653 | struct iommu_group *iommu_group) | |
1654 | { | |
1655 | struct vfio_iommu *iommu = iommu_data; | |
7896c998 | 1656 | struct vfio_group *group; |
1ef3e2bc | 1657 | struct vfio_domain *domain, *d; |
be068fa2 | 1658 | struct bus_type *bus = NULL; |
73fa0d10 | 1659 | int ret; |
9d72f87b | 1660 | bool resv_msi, msi_remap; |
95f89e09 | 1661 | phys_addr_t resv_msi_base = 0; |
1108696a SK |
1662 | struct iommu_domain_geometry geo; |
1663 | LIST_HEAD(iova_copy); | |
af029169 | 1664 | LIST_HEAD(group_resv_regions); |
73fa0d10 | 1665 | |
73fa0d10 AW |
1666 | mutex_lock(&iommu->lock); |
1667 | ||
1ef3e2bc | 1668 | list_for_each_entry(d, &iommu->domain_list, next) { |
7896c998 | 1669 | if (find_iommu_group(d, iommu_group)) { |
73fa0d10 | 1670 | mutex_unlock(&iommu->lock); |
73fa0d10 AW |
1671 | return -EINVAL; |
1672 | } | |
1673 | } | |
1674 | ||
a54eb550 KW |
1675 | if (iommu->external_domain) { |
1676 | if (find_iommu_group(iommu->external_domain, iommu_group)) { | |
1677 | mutex_unlock(&iommu->lock); | |
1678 | return -EINVAL; | |
1679 | } | |
1680 | } | |
1681 | ||
1ef3e2bc AW |
1682 | group = kzalloc(sizeof(*group), GFP_KERNEL); |
1683 | domain = kzalloc(sizeof(*domain), GFP_KERNEL); | |
1684 | if (!group || !domain) { | |
1685 | ret = -ENOMEM; | |
1686 | goto out_free; | |
1687 | } | |
1688 | ||
1689 | group->iommu_group = iommu_group; | |
1690 | ||
1691 | /* Determine bus_type in order to allocate a domain */ | |
1692 | ret = iommu_group_for_each_dev(iommu_group, &bus, vfio_bus_type); | |
1693 | if (ret) | |
1694 | goto out_free; | |
1695 | ||
be068fa2 LB |
1696 | if (vfio_bus_is_mdev(bus)) { |
1697 | struct device *iommu_device = NULL; | |
a54eb550 | 1698 | |
be068fa2 LB |
1699 | group->mdev_group = true; |
1700 | ||
1701 | /* Determine the isolation type */ | |
1702 | ret = iommu_group_for_each_dev(iommu_group, &iommu_device, | |
1703 | vfio_mdev_iommu_device); | |
1704 | if (ret || !iommu_device) { | |
a54eb550 KW |
1705 | if (!iommu->external_domain) { |
1706 | INIT_LIST_HEAD(&domain->group_list); | |
1707 | iommu->external_domain = domain; | |
be068fa2 | 1708 | } else { |
a54eb550 | 1709 | kfree(domain); |
be068fa2 | 1710 | } |
a54eb550 KW |
1711 | |
1712 | list_add(&group->next, | |
1713 | &iommu->external_domain->group_list); | |
1714 | mutex_unlock(&iommu->lock); | |
be068fa2 | 1715 | |
a54eb550 KW |
1716 | return 0; |
1717 | } | |
be068fa2 LB |
1718 | |
1719 | bus = iommu_device->bus; | |
a54eb550 KW |
1720 | } |
1721 | ||
1ef3e2bc AW |
1722 | domain->domain = iommu_domain_alloc(bus); |
1723 | if (!domain->domain) { | |
1724 | ret = -EIO; | |
1725 | goto out_free; | |
1726 | } | |
1727 | ||
f5c9eceb WD |
1728 | if (iommu->nesting) { |
1729 | int attr = 1; | |
1730 | ||
1731 | ret = iommu_domain_set_attr(domain->domain, DOMAIN_ATTR_NESTING, | |
1732 | &attr); | |
1733 | if (ret) | |
1734 | goto out_domain; | |
1735 | } | |
1736 | ||
7bd50f0c | 1737 | ret = vfio_iommu_attach_group(domain, group); |
1ef3e2bc AW |
1738 | if (ret) |
1739 | goto out_domain; | |
1740 | ||
1108696a SK |
1741 | /* Get aperture info */ |
1742 | iommu_domain_get_attr(domain->domain, DOMAIN_ATTR_GEOMETRY, &geo); | |
1743 | ||
1744 | if (vfio_iommu_aper_conflict(iommu, geo.aperture_start, | |
1745 | geo.aperture_end)) { | |
1746 | ret = -EINVAL; | |
1747 | goto out_detach; | |
1748 | } | |
1749 | ||
af029169 SK |
1750 | ret = iommu_get_group_resv_regions(iommu_group, &group_resv_regions); |
1751 | if (ret) | |
1752 | goto out_detach; | |
1753 | ||
1754 | if (vfio_iommu_resv_conflict(iommu, &group_resv_regions)) { | |
1755 | ret = -EINVAL; | |
1756 | goto out_detach; | |
1757 | } | |
1758 | ||
1108696a SK |
1759 | /* |
1760 | * We don't want to work on the original iova list as the list | |
1761 | * gets modified and in case of failure we have to retain the | |
1762 | * original list. Get a copy here. | |
1763 | */ | |
1764 | ret = vfio_iommu_iova_get_copy(iommu, &iova_copy); | |
1765 | if (ret) | |
1766 | goto out_detach; | |
1767 | ||
1768 | ret = vfio_iommu_aper_resize(&iova_copy, geo.aperture_start, | |
1769 | geo.aperture_end); | |
1770 | if (ret) | |
1771 | goto out_detach; | |
1772 | ||
af029169 SK |
1773 | ret = vfio_iommu_resv_exclude(&iova_copy, &group_resv_regions); |
1774 | if (ret) | |
1775 | goto out_detach; | |
1776 | ||
b09d6e47 | 1777 | resv_msi = vfio_iommu_has_sw_msi(&group_resv_regions, &resv_msi_base); |
5d704992 | 1778 | |
1ef3e2bc AW |
1779 | INIT_LIST_HEAD(&domain->group_list); |
1780 | list_add(&group->next, &domain->group_list); | |
1781 | ||
db406cc0 RM |
1782 | msi_remap = irq_domain_check_msi_remap() || |
1783 | iommu_capable(bus, IOMMU_CAP_INTR_REMAP); | |
9d72f87b EA |
1784 | |
1785 | if (!allow_unsafe_interrupts && !msi_remap) { | |
1ef3e2bc AW |
1786 | pr_warn("%s: No interrupt remapping support. Use the module param \"allow_unsafe_interrupts\" to enable VFIO IOMMU support on this platform\n", |
1787 | __func__); | |
1788 | ret = -EPERM; | |
1789 | goto out_detach; | |
1790 | } | |
1791 | ||
eb165f05 | 1792 | if (iommu_capable(bus, IOMMU_CAP_CACHE_COHERENCY)) |
1ef3e2bc AW |
1793 | domain->prot |= IOMMU_CACHE; |
1794 | ||
73fa0d10 | 1795 | /* |
1ef3e2bc AW |
1796 | * Try to match an existing compatible domain. We don't want to |
1797 | * preclude an IOMMU driver supporting multiple bus_types and being | |
1798 | * able to include different bus_types in the same IOMMU domain, so | |
1799 | * we test whether the domains use the same iommu_ops rather than | |
1800 | * testing if they're on the same bus_type. | |
73fa0d10 | 1801 | */ |
1ef3e2bc AW |
1802 | list_for_each_entry(d, &iommu->domain_list, next) { |
1803 | if (d->domain->ops == domain->domain->ops && | |
1804 | d->prot == domain->prot) { | |
7bd50f0c LB |
1805 | vfio_iommu_detach_group(domain, group); |
1806 | if (!vfio_iommu_attach_group(d, group)) { | |
1ef3e2bc AW |
1807 | list_add(&group->next, &d->group_list); |
1808 | iommu_domain_free(domain->domain); | |
1809 | kfree(domain); | |
1108696a | 1810 | goto done; |
1ef3e2bc AW |
1811 | } |
1812 | ||
7bd50f0c | 1813 | ret = vfio_iommu_attach_group(domain, group); |
1ef3e2bc AW |
1814 | if (ret) |
1815 | goto out_domain; | |
1816 | } | |
73fa0d10 AW |
1817 | } |
1818 | ||
6fe1010d AW |
1819 | vfio_test_domain_fgsp(domain); |
1820 | ||
1ef3e2bc AW |
1821 | /* replay mappings on new domains */ |
1822 | ret = vfio_iommu_replay(iommu, domain); | |
1823 | if (ret) | |
1824 | goto out_detach; | |
1825 | ||
2c9f1af5 WY |
1826 | if (resv_msi) { |
1827 | ret = iommu_get_msi_cookie(domain->domain, resv_msi_base); | |
1828 | if (ret) | |
1829 | goto out_detach; | |
1830 | } | |
5d704992 | 1831 | |
1ef3e2bc | 1832 | list_add(&domain->next, &iommu->domain_list); |
1108696a SK |
1833 | done: |
1834 | /* Delete the old one and insert new iova list */ | |
1835 | vfio_iommu_iova_insert_copy(iommu, &iova_copy); | |
73fa0d10 | 1836 | mutex_unlock(&iommu->lock); |
af029169 | 1837 | vfio_iommu_resv_free(&group_resv_regions); |
73fa0d10 AW |
1838 | |
1839 | return 0; | |
1ef3e2bc AW |
1840 | |
1841 | out_detach: | |
7bd50f0c | 1842 | vfio_iommu_detach_group(domain, group); |
1ef3e2bc AW |
1843 | out_domain: |
1844 | iommu_domain_free(domain->domain); | |
1108696a | 1845 | vfio_iommu_iova_free(&iova_copy); |
af029169 | 1846 | vfio_iommu_resv_free(&group_resv_regions); |
1ef3e2bc AW |
1847 | out_free: |
1848 | kfree(domain); | |
1849 | kfree(group); | |
1850 | mutex_unlock(&iommu->lock); | |
1851 | return ret; | |
1852 | } | |
1853 | ||
1854 | static void vfio_iommu_unmap_unpin_all(struct vfio_iommu *iommu) | |
1855 | { | |
1856 | struct rb_node *node; | |
1857 | ||
1858 | while ((node = rb_first(&iommu->dma_list))) | |
1859 | vfio_remove_dma(iommu, rb_entry(node, struct vfio_dma, node)); | |
73fa0d10 AW |
1860 | } |
1861 | ||
a54eb550 KW |
1862 | static void vfio_iommu_unmap_unpin_reaccount(struct vfio_iommu *iommu) |
1863 | { | |
1864 | struct rb_node *n, *p; | |
1865 | ||
1866 | n = rb_first(&iommu->dma_list); | |
1867 | for (; n; n = rb_next(n)) { | |
1868 | struct vfio_dma *dma; | |
1869 | long locked = 0, unlocked = 0; | |
1870 | ||
1871 | dma = rb_entry(n, struct vfio_dma, node); | |
1872 | unlocked += vfio_unmap_unpin(iommu, dma, false); | |
1873 | p = rb_first(&dma->pfn_list); | |
1874 | for (; p; p = rb_next(p)) { | |
1875 | struct vfio_pfn *vpfn = rb_entry(p, struct vfio_pfn, | |
1876 | node); | |
1877 | ||
1878 | if (!is_invalid_reserved_pfn(vpfn->pfn)) | |
1879 | locked++; | |
1880 | } | |
48d8476b | 1881 | vfio_lock_acct(dma, locked - unlocked, true); |
a54eb550 KW |
1882 | } |
1883 | } | |
1884 | ||
1885 | static void vfio_sanity_check_pfn_list(struct vfio_iommu *iommu) | |
1886 | { | |
1887 | struct rb_node *n; | |
1888 | ||
1889 | n = rb_first(&iommu->dma_list); | |
1890 | for (; n; n = rb_next(n)) { | |
1891 | struct vfio_dma *dma; | |
1892 | ||
1893 | dma = rb_entry(n, struct vfio_dma, node); | |
1894 | ||
1895 | if (WARN_ON(!RB_EMPTY_ROOT(&dma->pfn_list))) | |
1896 | break; | |
1897 | } | |
3cedd7d7 KW |
1898 | /* mdev vendor driver must unregister notifier */ |
1899 | WARN_ON(iommu->notifier.head); | |
a54eb550 KW |
1900 | } |
1901 | ||
f45daadf SK |
1902 | /* |
1903 | * Called when a domain is removed in detach. It is possible that | |
1904 | * the removed domain decided the iova aperture window. Modify the | |
1905 | * iova aperture with the smallest window among existing domains. | |
1906 | */ | |
1907 | static void vfio_iommu_aper_expand(struct vfio_iommu *iommu, | |
1908 | struct list_head *iova_copy) | |
1909 | { | |
1910 | struct vfio_domain *domain; | |
1911 | struct iommu_domain_geometry geo; | |
1912 | struct vfio_iova *node; | |
1913 | dma_addr_t start = 0; | |
1914 | dma_addr_t end = (dma_addr_t)~0; | |
1915 | ||
1916 | if (list_empty(iova_copy)) | |
1917 | return; | |
1918 | ||
1919 | list_for_each_entry(domain, &iommu->domain_list, next) { | |
1920 | iommu_domain_get_attr(domain->domain, DOMAIN_ATTR_GEOMETRY, | |
1921 | &geo); | |
1922 | if (geo.aperture_start > start) | |
1923 | start = geo.aperture_start; | |
1924 | if (geo.aperture_end < end) | |
1925 | end = geo.aperture_end; | |
1926 | } | |
1927 | ||
1928 | /* Modify aperture limits. The new aper is either same or bigger */ | |
1929 | node = list_first_entry(iova_copy, struct vfio_iova, list); | |
1930 | node->start = start; | |
1931 | node = list_last_entry(iova_copy, struct vfio_iova, list); | |
1932 | node->end = end; | |
1933 | } | |
1934 | ||
1935 | /* | |
1936 | * Called when a group is detached. The reserved regions for that | |
1937 | * group can be part of valid iova now. But since reserved regions | |
1938 | * may be duplicated among groups, populate the iova valid regions | |
1939 | * list again. | |
1940 | */ | |
1941 | static int vfio_iommu_resv_refresh(struct vfio_iommu *iommu, | |
1942 | struct list_head *iova_copy) | |
1943 | { | |
1944 | struct vfio_domain *d; | |
1945 | struct vfio_group *g; | |
1946 | struct vfio_iova *node; | |
1947 | dma_addr_t start, end; | |
1948 | LIST_HEAD(resv_regions); | |
1949 | int ret; | |
1950 | ||
1951 | if (list_empty(iova_copy)) | |
1952 | return -EINVAL; | |
1953 | ||
1954 | list_for_each_entry(d, &iommu->domain_list, next) { | |
1955 | list_for_each_entry(g, &d->group_list, next) { | |
1956 | ret = iommu_get_group_resv_regions(g->iommu_group, | |
1957 | &resv_regions); | |
1958 | if (ret) | |
1959 | goto done; | |
1960 | } | |
1961 | } | |
1962 | ||
1963 | node = list_first_entry(iova_copy, struct vfio_iova, list); | |
1964 | start = node->start; | |
1965 | node = list_last_entry(iova_copy, struct vfio_iova, list); | |
1966 | end = node->end; | |
1967 | ||
1968 | /* purge the iova list and create new one */ | |
1969 | vfio_iommu_iova_free(iova_copy); | |
1970 | ||
1971 | ret = vfio_iommu_aper_resize(iova_copy, start, end); | |
1972 | if (ret) | |
1973 | goto done; | |
1974 | ||
1975 | /* Exclude current reserved regions from iova ranges */ | |
1976 | ret = vfio_iommu_resv_exclude(iova_copy, &resv_regions); | |
1977 | done: | |
1978 | vfio_iommu_resv_free(&resv_regions); | |
1979 | return ret; | |
1980 | } | |
1981 | ||
73fa0d10 AW |
1982 | static void vfio_iommu_type1_detach_group(void *iommu_data, |
1983 | struct iommu_group *iommu_group) | |
1984 | { | |
1985 | struct vfio_iommu *iommu = iommu_data; | |
1ef3e2bc | 1986 | struct vfio_domain *domain; |
73fa0d10 | 1987 | struct vfio_group *group; |
f45daadf | 1988 | LIST_HEAD(iova_copy); |
73fa0d10 AW |
1989 | |
1990 | mutex_lock(&iommu->lock); | |
1991 | ||
a54eb550 KW |
1992 | if (iommu->external_domain) { |
1993 | group = find_iommu_group(iommu->external_domain, iommu_group); | |
1994 | if (group) { | |
1995 | list_del(&group->next); | |
1996 | kfree(group); | |
1997 | ||
1998 | if (list_empty(&iommu->external_domain->group_list)) { | |
1999 | vfio_sanity_check_pfn_list(iommu); | |
2000 | ||
2001 | if (!IS_IOMMU_CAP_DOMAIN_IN_CONTAINER(iommu)) | |
2002 | vfio_iommu_unmap_unpin_all(iommu); | |
2003 | ||
2004 | kfree(iommu->external_domain); | |
2005 | iommu->external_domain = NULL; | |
2006 | } | |
2007 | goto detach_group_done; | |
2008 | } | |
2009 | } | |
2010 | ||
f45daadf SK |
2011 | /* |
2012 | * Get a copy of iova list. This will be used to update | |
2013 | * and to replace the current one later. Please note that | |
2014 | * we will leave the original list as it is if update fails. | |
2015 | */ | |
2016 | vfio_iommu_iova_get_copy(iommu, &iova_copy); | |
2017 | ||
1ef3e2bc | 2018 | list_for_each_entry(domain, &iommu->domain_list, next) { |
7896c998 KW |
2019 | group = find_iommu_group(domain, iommu_group); |
2020 | if (!group) | |
2021 | continue; | |
1ef3e2bc | 2022 | |
7bd50f0c | 2023 | vfio_iommu_detach_group(domain, group); |
7896c998 KW |
2024 | list_del(&group->next); |
2025 | kfree(group); | |
2026 | /* | |
a54eb550 KW |
2027 | * Group ownership provides privilege, if the group list is |
2028 | * empty, the domain goes away. If it's the last domain with | |
2029 | * iommu and external domain doesn't exist, then all the | |
2030 | * mappings go away too. If it's the last domain with iommu and | |
2031 | * external domain exist, update accounting | |
7896c998 KW |
2032 | */ |
2033 | if (list_empty(&domain->group_list)) { | |
a54eb550 KW |
2034 | if (list_is_singular(&iommu->domain_list)) { |
2035 | if (!iommu->external_domain) | |
2036 | vfio_iommu_unmap_unpin_all(iommu); | |
2037 | else | |
2038 | vfio_iommu_unmap_unpin_reaccount(iommu); | |
2039 | } | |
7896c998 KW |
2040 | iommu_domain_free(domain->domain); |
2041 | list_del(&domain->next); | |
2042 | kfree(domain); | |
f45daadf | 2043 | vfio_iommu_aper_expand(iommu, &iova_copy); |
73fa0d10 | 2044 | } |
a54eb550 | 2045 | break; |
73fa0d10 AW |
2046 | } |
2047 | ||
f45daadf SK |
2048 | if (!vfio_iommu_resv_refresh(iommu, &iova_copy)) |
2049 | vfio_iommu_iova_insert_copy(iommu, &iova_copy); | |
2050 | else | |
2051 | vfio_iommu_iova_free(&iova_copy); | |
2052 | ||
a54eb550 | 2053 | detach_group_done: |
73fa0d10 AW |
2054 | mutex_unlock(&iommu->lock); |
2055 | } | |
2056 | ||
2057 | static void *vfio_iommu_type1_open(unsigned long arg) | |
2058 | { | |
2059 | struct vfio_iommu *iommu; | |
2060 | ||
73fa0d10 AW |
2061 | iommu = kzalloc(sizeof(*iommu), GFP_KERNEL); |
2062 | if (!iommu) | |
2063 | return ERR_PTR(-ENOMEM); | |
2064 | ||
f5c9eceb WD |
2065 | switch (arg) { |
2066 | case VFIO_TYPE1_IOMMU: | |
2067 | break; | |
2068 | case VFIO_TYPE1_NESTING_IOMMU: | |
2069 | iommu->nesting = true; | |
544c05a6 | 2070 | /* fall through */ |
f5c9eceb WD |
2071 | case VFIO_TYPE1v2_IOMMU: |
2072 | iommu->v2 = true; | |
2073 | break; | |
2074 | default: | |
2075 | kfree(iommu); | |
2076 | return ERR_PTR(-EINVAL); | |
2077 | } | |
2078 | ||
1ef3e2bc | 2079 | INIT_LIST_HEAD(&iommu->domain_list); |
1108696a | 2080 | INIT_LIST_HEAD(&iommu->iova_list); |
cd9b2268 | 2081 | iommu->dma_list = RB_ROOT; |
49285593 | 2082 | iommu->dma_avail = dma_entry_limit; |
73fa0d10 | 2083 | mutex_init(&iommu->lock); |
c086de81 | 2084 | BLOCKING_INIT_NOTIFIER_HEAD(&iommu->notifier); |
73fa0d10 AW |
2085 | |
2086 | return iommu; | |
2087 | } | |
2088 | ||
a54eb550 KW |
2089 | static void vfio_release_domain(struct vfio_domain *domain, bool external) |
2090 | { | |
2091 | struct vfio_group *group, *group_tmp; | |
2092 | ||
2093 | list_for_each_entry_safe(group, group_tmp, | |
2094 | &domain->group_list, next) { | |
2095 | if (!external) | |
7bd50f0c | 2096 | vfio_iommu_detach_group(domain, group); |
a54eb550 KW |
2097 | list_del(&group->next); |
2098 | kfree(group); | |
2099 | } | |
2100 | ||
2101 | if (!external) | |
2102 | iommu_domain_free(domain->domain); | |
2103 | } | |
2104 | ||
73fa0d10 AW |
2105 | static void vfio_iommu_type1_release(void *iommu_data) |
2106 | { | |
2107 | struct vfio_iommu *iommu = iommu_data; | |
1ef3e2bc | 2108 | struct vfio_domain *domain, *domain_tmp; |
a54eb550 KW |
2109 | |
2110 | if (iommu->external_domain) { | |
2111 | vfio_release_domain(iommu->external_domain, true); | |
2112 | vfio_sanity_check_pfn_list(iommu); | |
2113 | kfree(iommu->external_domain); | |
2114 | } | |
73fa0d10 | 2115 | |
1ef3e2bc | 2116 | vfio_iommu_unmap_unpin_all(iommu); |
73fa0d10 | 2117 | |
1ef3e2bc AW |
2118 | list_for_each_entry_safe(domain, domain_tmp, |
2119 | &iommu->domain_list, next) { | |
a54eb550 | 2120 | vfio_release_domain(domain, false); |
1ef3e2bc AW |
2121 | list_del(&domain->next); |
2122 | kfree(domain); | |
73fa0d10 | 2123 | } |
1108696a SK |
2124 | |
2125 | vfio_iommu_iova_free(&iommu->iova_list); | |
2126 | ||
73fa0d10 AW |
2127 | kfree(iommu); |
2128 | } | |
2129 | ||
aa429318 AW |
2130 | static int vfio_domains_have_iommu_cache(struct vfio_iommu *iommu) |
2131 | { | |
2132 | struct vfio_domain *domain; | |
2133 | int ret = 1; | |
2134 | ||
2135 | mutex_lock(&iommu->lock); | |
2136 | list_for_each_entry(domain, &iommu->domain_list, next) { | |
2137 | if (!(domain->prot & IOMMU_CACHE)) { | |
2138 | ret = 0; | |
f5bfdbf2 | 2139 | break; |
aa429318 | 2140 | } |
73fa0d10 | 2141 | } |
aa429318 | 2142 | mutex_unlock(&iommu->lock); |
73fa0d10 | 2143 | |
aa429318 | 2144 | return ret; |
73fa0d10 AW |
2145 | } |
2146 | ||
a7170720 SK |
2147 | static int vfio_iommu_iova_add_cap(struct vfio_info_cap *caps, |
2148 | struct vfio_iommu_type1_info_cap_iova_range *cap_iovas, | |
2149 | size_t size) | |
2150 | { | |
2151 | struct vfio_info_cap_header *header; | |
2152 | struct vfio_iommu_type1_info_cap_iova_range *iova_cap; | |
2153 | ||
2154 | header = vfio_info_cap_add(caps, size, | |
2155 | VFIO_IOMMU_TYPE1_INFO_CAP_IOVA_RANGE, 1); | |
2156 | if (IS_ERR(header)) | |
2157 | return PTR_ERR(header); | |
2158 | ||
2159 | iova_cap = container_of(header, | |
2160 | struct vfio_iommu_type1_info_cap_iova_range, | |
2161 | header); | |
2162 | iova_cap->nr_iovas = cap_iovas->nr_iovas; | |
2163 | memcpy(iova_cap->iova_ranges, cap_iovas->iova_ranges, | |
2164 | cap_iovas->nr_iovas * sizeof(*cap_iovas->iova_ranges)); | |
2165 | return 0; | |
2166 | } | |
2167 | ||
2168 | static int vfio_iommu_iova_build_caps(struct vfio_iommu *iommu, | |
2169 | struct vfio_info_cap *caps) | |
2170 | { | |
2171 | struct vfio_iommu_type1_info_cap_iova_range *cap_iovas; | |
2172 | struct vfio_iova *iova; | |
2173 | size_t size; | |
2174 | int iovas = 0, i = 0, ret; | |
2175 | ||
2176 | mutex_lock(&iommu->lock); | |
2177 | ||
2178 | list_for_each_entry(iova, &iommu->iova_list, list) | |
2179 | iovas++; | |
2180 | ||
2181 | if (!iovas) { | |
2182 | /* | |
2183 | * Return 0 as a container with a single mdev device | |
2184 | * will have an empty list | |
2185 | */ | |
2186 | ret = 0; | |
2187 | goto out_unlock; | |
2188 | } | |
2189 | ||
2190 | size = sizeof(*cap_iovas) + (iovas * sizeof(*cap_iovas->iova_ranges)); | |
2191 | ||
2192 | cap_iovas = kzalloc(size, GFP_KERNEL); | |
2193 | if (!cap_iovas) { | |
2194 | ret = -ENOMEM; | |
2195 | goto out_unlock; | |
2196 | } | |
2197 | ||
2198 | cap_iovas->nr_iovas = iovas; | |
2199 | ||
2200 | list_for_each_entry(iova, &iommu->iova_list, list) { | |
2201 | cap_iovas->iova_ranges[i].start = iova->start; | |
2202 | cap_iovas->iova_ranges[i].end = iova->end; | |
2203 | i++; | |
2204 | } | |
2205 | ||
2206 | ret = vfio_iommu_iova_add_cap(caps, cap_iovas, size); | |
2207 | ||
2208 | kfree(cap_iovas); | |
2209 | out_unlock: | |
2210 | mutex_unlock(&iommu->lock); | |
2211 | return ret; | |
2212 | } | |
2213 | ||
73fa0d10 AW |
2214 | static long vfio_iommu_type1_ioctl(void *iommu_data, |
2215 | unsigned int cmd, unsigned long arg) | |
2216 | { | |
2217 | struct vfio_iommu *iommu = iommu_data; | |
2218 | unsigned long minsz; | |
2219 | ||
2220 | if (cmd == VFIO_CHECK_EXTENSION) { | |
2221 | switch (arg) { | |
2222 | case VFIO_TYPE1_IOMMU: | |
1ef3e2bc | 2223 | case VFIO_TYPE1v2_IOMMU: |
f5c9eceb | 2224 | case VFIO_TYPE1_NESTING_IOMMU: |
73fa0d10 | 2225 | return 1; |
aa429318 AW |
2226 | case VFIO_DMA_CC_IOMMU: |
2227 | if (!iommu) | |
2228 | return 0; | |
2229 | return vfio_domains_have_iommu_cache(iommu); | |
73fa0d10 AW |
2230 | default: |
2231 | return 0; | |
2232 | } | |
2233 | } else if (cmd == VFIO_IOMMU_GET_INFO) { | |
2234 | struct vfio_iommu_type1_info info; | |
a7170720 SK |
2235 | struct vfio_info_cap caps = { .buf = NULL, .size = 0 }; |
2236 | unsigned long capsz; | |
2237 | int ret; | |
73fa0d10 AW |
2238 | |
2239 | minsz = offsetofend(struct vfio_iommu_type1_info, iova_pgsizes); | |
2240 | ||
a7170720 SK |
2241 | /* For backward compatibility, cannot require this */ |
2242 | capsz = offsetofend(struct vfio_iommu_type1_info, cap_offset); | |
2243 | ||
73fa0d10 AW |
2244 | if (copy_from_user(&info, (void __user *)arg, minsz)) |
2245 | return -EFAULT; | |
2246 | ||
2247 | if (info.argsz < minsz) | |
2248 | return -EINVAL; | |
2249 | ||
a7170720 SK |
2250 | if (info.argsz >= capsz) { |
2251 | minsz = capsz; | |
2252 | info.cap_offset = 0; /* output, no-recopy necessary */ | |
2253 | } | |
2254 | ||
d4f50ee2 | 2255 | info.flags = VFIO_IOMMU_INFO_PGSIZES; |
73fa0d10 | 2256 | |
1ef3e2bc | 2257 | info.iova_pgsizes = vfio_pgsize_bitmap(iommu); |
73fa0d10 | 2258 | |
a7170720 SK |
2259 | ret = vfio_iommu_iova_build_caps(iommu, &caps); |
2260 | if (ret) | |
2261 | return ret; | |
2262 | ||
2263 | if (caps.size) { | |
2264 | info.flags |= VFIO_IOMMU_INFO_CAPS; | |
2265 | ||
2266 | if (info.argsz < sizeof(info) + caps.size) { | |
2267 | info.argsz = sizeof(info) + caps.size; | |
2268 | } else { | |
2269 | vfio_info_cap_shift(&caps, sizeof(info)); | |
2270 | if (copy_to_user((void __user *)arg + | |
2271 | sizeof(info), caps.buf, | |
2272 | caps.size)) { | |
2273 | kfree(caps.buf); | |
2274 | return -EFAULT; | |
2275 | } | |
2276 | info.cap_offset = sizeof(info); | |
2277 | } | |
2278 | ||
2279 | kfree(caps.buf); | |
2280 | } | |
2281 | ||
8160c4e4 MT |
2282 | return copy_to_user((void __user *)arg, &info, minsz) ? |
2283 | -EFAULT : 0; | |
73fa0d10 AW |
2284 | |
2285 | } else if (cmd == VFIO_IOMMU_MAP_DMA) { | |
2286 | struct vfio_iommu_type1_dma_map map; | |
2287 | uint32_t mask = VFIO_DMA_MAP_FLAG_READ | | |
2288 | VFIO_DMA_MAP_FLAG_WRITE; | |
2289 | ||
2290 | minsz = offsetofend(struct vfio_iommu_type1_dma_map, size); | |
2291 | ||
2292 | if (copy_from_user(&map, (void __user *)arg, minsz)) | |
2293 | return -EFAULT; | |
2294 | ||
2295 | if (map.argsz < minsz || map.flags & ~mask) | |
2296 | return -EINVAL; | |
2297 | ||
2298 | return vfio_dma_do_map(iommu, &map); | |
2299 | ||
2300 | } else if (cmd == VFIO_IOMMU_UNMAP_DMA) { | |
2301 | struct vfio_iommu_type1_dma_unmap unmap; | |
166fd7d9 | 2302 | long ret; |
73fa0d10 AW |
2303 | |
2304 | minsz = offsetofend(struct vfio_iommu_type1_dma_unmap, size); | |
2305 | ||
2306 | if (copy_from_user(&unmap, (void __user *)arg, minsz)) | |
2307 | return -EFAULT; | |
2308 | ||
2309 | if (unmap.argsz < minsz || unmap.flags) | |
2310 | return -EINVAL; | |
2311 | ||
166fd7d9 AW |
2312 | ret = vfio_dma_do_unmap(iommu, &unmap); |
2313 | if (ret) | |
2314 | return ret; | |
2315 | ||
8160c4e4 MT |
2316 | return copy_to_user((void __user *)arg, &unmap, minsz) ? |
2317 | -EFAULT : 0; | |
73fa0d10 AW |
2318 | } |
2319 | ||
2320 | return -ENOTTY; | |
2321 | } | |
2322 | ||
c086de81 | 2323 | static int vfio_iommu_type1_register_notifier(void *iommu_data, |
22195cbd | 2324 | unsigned long *events, |
c086de81 KW |
2325 | struct notifier_block *nb) |
2326 | { | |
2327 | struct vfio_iommu *iommu = iommu_data; | |
2328 | ||
22195cbd JS |
2329 | /* clear known events */ |
2330 | *events &= ~VFIO_IOMMU_NOTIFY_DMA_UNMAP; | |
2331 | ||
2332 | /* refuse to register if still events remaining */ | |
2333 | if (*events) | |
2334 | return -EINVAL; | |
2335 | ||
c086de81 KW |
2336 | return blocking_notifier_chain_register(&iommu->notifier, nb); |
2337 | } | |
2338 | ||
2339 | static int vfio_iommu_type1_unregister_notifier(void *iommu_data, | |
2340 | struct notifier_block *nb) | |
2341 | { | |
2342 | struct vfio_iommu *iommu = iommu_data; | |
2343 | ||
2344 | return blocking_notifier_chain_unregister(&iommu->notifier, nb); | |
2345 | } | |
2346 | ||
73fa0d10 | 2347 | static const struct vfio_iommu_driver_ops vfio_iommu_driver_ops_type1 = { |
c086de81 KW |
2348 | .name = "vfio-iommu-type1", |
2349 | .owner = THIS_MODULE, | |
2350 | .open = vfio_iommu_type1_open, | |
2351 | .release = vfio_iommu_type1_release, | |
2352 | .ioctl = vfio_iommu_type1_ioctl, | |
2353 | .attach_group = vfio_iommu_type1_attach_group, | |
2354 | .detach_group = vfio_iommu_type1_detach_group, | |
2355 | .pin_pages = vfio_iommu_type1_pin_pages, | |
2356 | .unpin_pages = vfio_iommu_type1_unpin_pages, | |
2357 | .register_notifier = vfio_iommu_type1_register_notifier, | |
2358 | .unregister_notifier = vfio_iommu_type1_unregister_notifier, | |
73fa0d10 AW |
2359 | }; |
2360 | ||
2361 | static int __init vfio_iommu_type1_init(void) | |
2362 | { | |
73fa0d10 AW |
2363 | return vfio_register_iommu_driver(&vfio_iommu_driver_ops_type1); |
2364 | } | |
2365 | ||
2366 | static void __exit vfio_iommu_type1_cleanup(void) | |
2367 | { | |
2368 | vfio_unregister_iommu_driver(&vfio_iommu_driver_ops_type1); | |
2369 | } | |
2370 | ||
2371 | module_init(vfio_iommu_type1_init); | |
2372 | module_exit(vfio_iommu_type1_cleanup); | |
2373 | ||
2374 | MODULE_VERSION(DRIVER_VERSION); | |
2375 | MODULE_LICENSE("GPL v2"); | |
2376 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
2377 | MODULE_DESCRIPTION(DRIVER_DESC); |