Commit | Line | Data |
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5ffd229c AK |
1 | /* |
2 | * VFIO: IOMMU DMA mapping support for TCE on POWER | |
3 | * | |
4 | * Copyright (C) 2013 IBM Corp. All rights reserved. | |
5 | * Author: Alexey Kardashevskiy <aik@ozlabs.ru> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | * Derived from original vfio_iommu_type1.c: | |
12 | * Copyright (C) 2012 Red Hat, Inc. All rights reserved. | |
13 | * Author: Alex Williamson <alex.williamson@redhat.com> | |
14 | */ | |
15 | ||
16 | #include <linux/module.h> | |
17 | #include <linux/pci.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/uaccess.h> | |
20 | #include <linux/err.h> | |
21 | #include <linux/vfio.h> | |
2157e7b8 | 22 | #include <linux/vmalloc.h> |
5ffd229c AK |
23 | #include <asm/iommu.h> |
24 | #include <asm/tce.h> | |
2157e7b8 | 25 | #include <asm/mmu_context.h> |
5ffd229c AK |
26 | |
27 | #define DRIVER_VERSION "0.1" | |
28 | #define DRIVER_AUTHOR "aik@ozlabs.ru" | |
29 | #define DRIVER_DESC "VFIO IOMMU SPAPR TCE" | |
30 | ||
31 | static void tce_iommu_detach_group(void *iommu_data, | |
32 | struct iommu_group *iommu_group); | |
33 | ||
2d270df8 AK |
34 | static long try_increment_locked_vm(long npages) |
35 | { | |
36 | long ret = 0, locked, lock_limit; | |
37 | ||
38 | if (!current || !current->mm) | |
39 | return -ESRCH; /* process exited */ | |
40 | ||
41 | if (!npages) | |
42 | return 0; | |
43 | ||
44 | down_write(¤t->mm->mmap_sem); | |
45 | locked = current->mm->locked_vm + npages; | |
46 | lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
47 | if (locked > lock_limit && !capable(CAP_IPC_LOCK)) | |
48 | ret = -ENOMEM; | |
49 | else | |
50 | current->mm->locked_vm += npages; | |
51 | ||
52 | pr_debug("[%d] RLIMIT_MEMLOCK +%ld %ld/%ld%s\n", current->pid, | |
53 | npages << PAGE_SHIFT, | |
54 | current->mm->locked_vm << PAGE_SHIFT, | |
55 | rlimit(RLIMIT_MEMLOCK), | |
56 | ret ? " - exceeded" : ""); | |
57 | ||
58 | up_write(¤t->mm->mmap_sem); | |
59 | ||
60 | return ret; | |
61 | } | |
62 | ||
63 | static void decrement_locked_vm(long npages) | |
64 | { | |
65 | if (!current || !current->mm || !npages) | |
66 | return; /* process exited */ | |
67 | ||
68 | down_write(¤t->mm->mmap_sem); | |
69 | if (WARN_ON_ONCE(npages > current->mm->locked_vm)) | |
70 | npages = current->mm->locked_vm; | |
71 | current->mm->locked_vm -= npages; | |
72 | pr_debug("[%d] RLIMIT_MEMLOCK -%ld %ld/%ld\n", current->pid, | |
73 | npages << PAGE_SHIFT, | |
74 | current->mm->locked_vm << PAGE_SHIFT, | |
75 | rlimit(RLIMIT_MEMLOCK)); | |
76 | up_write(¤t->mm->mmap_sem); | |
77 | } | |
78 | ||
5ffd229c AK |
79 | /* |
80 | * VFIO IOMMU fd for SPAPR_TCE IOMMU implementation | |
81 | * | |
82 | * This code handles mapping and unmapping of user data buffers | |
83 | * into DMA'ble space using the IOMMU | |
84 | */ | |
85 | ||
2157e7b8 AK |
86 | struct tce_iommu_group { |
87 | struct list_head next; | |
88 | struct iommu_group *grp; | |
89 | }; | |
90 | ||
5ffd229c AK |
91 | /* |
92 | * The container descriptor supports only a single group per container. | |
93 | * Required by the API as the container is not supplied with the IOMMU group | |
94 | * at the moment of initialization. | |
95 | */ | |
96 | struct tce_container { | |
97 | struct mutex lock; | |
5ffd229c | 98 | bool enabled; |
2157e7b8 | 99 | bool v2; |
2d270df8 | 100 | unsigned long locked_pages; |
2157e7b8 AK |
101 | struct iommu_table *tables[IOMMU_TABLE_GROUP_MAX_TABLES]; |
102 | struct list_head group_list; | |
5ffd229c AK |
103 | }; |
104 | ||
2157e7b8 AK |
105 | static long tce_iommu_unregister_pages(struct tce_container *container, |
106 | __u64 vaddr, __u64 size) | |
107 | { | |
108 | struct mm_iommu_table_group_mem_t *mem; | |
109 | ||
110 | if ((vaddr & ~PAGE_MASK) || (size & ~PAGE_MASK)) | |
111 | return -EINVAL; | |
112 | ||
113 | mem = mm_iommu_find(vaddr, size >> PAGE_SHIFT); | |
114 | if (!mem) | |
115 | return -ENOENT; | |
116 | ||
117 | return mm_iommu_put(mem); | |
118 | } | |
119 | ||
120 | static long tce_iommu_register_pages(struct tce_container *container, | |
121 | __u64 vaddr, __u64 size) | |
122 | { | |
123 | long ret = 0; | |
124 | struct mm_iommu_table_group_mem_t *mem = NULL; | |
125 | unsigned long entries = size >> PAGE_SHIFT; | |
126 | ||
127 | if ((vaddr & ~PAGE_MASK) || (size & ~PAGE_MASK) || | |
128 | ((vaddr + size) < vaddr)) | |
129 | return -EINVAL; | |
130 | ||
131 | ret = mm_iommu_get(vaddr, entries, &mem); | |
132 | if (ret) | |
133 | return ret; | |
134 | ||
135 | container->enabled = true; | |
136 | ||
137 | return 0; | |
138 | } | |
139 | ||
140 | static long tce_iommu_userspace_view_alloc(struct iommu_table *tbl) | |
141 | { | |
142 | unsigned long cb = _ALIGN_UP(sizeof(tbl->it_userspace[0]) * | |
143 | tbl->it_size, PAGE_SIZE); | |
144 | unsigned long *uas; | |
145 | long ret; | |
146 | ||
147 | BUG_ON(tbl->it_userspace); | |
148 | ||
149 | ret = try_increment_locked_vm(cb >> PAGE_SHIFT); | |
150 | if (ret) | |
151 | return ret; | |
152 | ||
153 | uas = vzalloc(cb); | |
154 | if (!uas) { | |
155 | decrement_locked_vm(cb >> PAGE_SHIFT); | |
156 | return -ENOMEM; | |
157 | } | |
158 | tbl->it_userspace = uas; | |
159 | ||
160 | return 0; | |
161 | } | |
162 | ||
163 | static void tce_iommu_userspace_view_free(struct iommu_table *tbl) | |
164 | { | |
165 | unsigned long cb = _ALIGN_UP(sizeof(tbl->it_userspace[0]) * | |
166 | tbl->it_size, PAGE_SIZE); | |
167 | ||
168 | if (!tbl->it_userspace) | |
169 | return; | |
170 | ||
171 | vfree(tbl->it_userspace); | |
172 | tbl->it_userspace = NULL; | |
173 | decrement_locked_vm(cb >> PAGE_SHIFT); | |
174 | } | |
175 | ||
e432bc7e AK |
176 | static bool tce_page_is_contained(struct page *page, unsigned page_shift) |
177 | { | |
178 | /* | |
179 | * Check that the TCE table granularity is not bigger than the size of | |
180 | * a page we just found. Otherwise the hardware can get access to | |
181 | * a bigger memory chunk that it should. | |
182 | */ | |
183 | return (PAGE_SHIFT + compound_order(compound_head(page))) >= page_shift; | |
184 | } | |
185 | ||
2157e7b8 AK |
186 | static inline bool tce_groups_attached(struct tce_container *container) |
187 | { | |
188 | return !list_empty(&container->group_list); | |
189 | } | |
190 | ||
0eaf4def AK |
191 | static long tce_iommu_find_table(struct tce_container *container, |
192 | phys_addr_t ioba, struct iommu_table **ptbl) | |
193 | { | |
194 | long i; | |
0eaf4def AK |
195 | |
196 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { | |
2157e7b8 | 197 | struct iommu_table *tbl = container->tables[i]; |
0eaf4def AK |
198 | |
199 | if (tbl) { | |
200 | unsigned long entry = ioba >> tbl->it_page_shift; | |
201 | unsigned long start = tbl->it_offset; | |
202 | unsigned long end = start + tbl->it_size; | |
203 | ||
204 | if ((start <= entry) && (entry < end)) { | |
205 | *ptbl = tbl; | |
206 | return i; | |
207 | } | |
208 | } | |
209 | } | |
210 | ||
211 | return -1; | |
212 | } | |
213 | ||
e633bc86 AK |
214 | static int tce_iommu_find_free_table(struct tce_container *container) |
215 | { | |
216 | int i; | |
217 | ||
218 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { | |
219 | if (!container->tables[i]) | |
220 | return i; | |
221 | } | |
222 | ||
223 | return -ENOSPC; | |
224 | } | |
225 | ||
5ffd229c AK |
226 | static int tce_iommu_enable(struct tce_container *container) |
227 | { | |
228 | int ret = 0; | |
2d270df8 | 229 | unsigned long locked; |
0eaf4def | 230 | struct iommu_table_group *table_group; |
2157e7b8 | 231 | struct tce_iommu_group *tcegrp; |
5ffd229c AK |
232 | |
233 | if (!current->mm) | |
234 | return -ESRCH; /* process exited */ | |
235 | ||
236 | if (container->enabled) | |
237 | return -EBUSY; | |
238 | ||
239 | /* | |
240 | * When userspace pages are mapped into the IOMMU, they are effectively | |
241 | * locked memory, so, theoretically, we need to update the accounting | |
242 | * of locked pages on each map and unmap. For powerpc, the map unmap | |
243 | * paths can be very hot, though, and the accounting would kill | |
244 | * performance, especially since it would be difficult to impossible | |
245 | * to handle the accounting in real mode only. | |
246 | * | |
247 | * To address that, rather than precisely accounting every page, we | |
248 | * instead account for a worst case on locked memory when the iommu is | |
249 | * enabled and disabled. The worst case upper bound on locked memory | |
250 | * is the size of the whole iommu window, which is usually relatively | |
251 | * small (compared to total memory sizes) on POWER hardware. | |
252 | * | |
253 | * Also we don't have a nice way to fail on H_PUT_TCE due to ulimits, | |
254 | * that would effectively kill the guest at random points, much better | |
255 | * enforcing the limit based on the max that the guest can map. | |
2d270df8 AK |
256 | * |
257 | * Unfortunately at the moment it counts whole tables, no matter how | |
258 | * much memory the guest has. I.e. for 4GB guest and 4 IOMMU groups | |
259 | * each with 2GB DMA window, 8GB will be counted here. The reason for | |
260 | * this is that we cannot tell here the amount of RAM used by the guest | |
261 | * as this information is only available from KVM and VFIO is | |
262 | * KVM agnostic. | |
4793d65d AK |
263 | * |
264 | * So we do not allow enabling a container without a group attached | |
265 | * as there is no way to know how much we should increment | |
266 | * the locked_vm counter. | |
5ffd229c | 267 | */ |
2157e7b8 AK |
268 | if (!tce_groups_attached(container)) |
269 | return -ENODEV; | |
270 | ||
271 | tcegrp = list_first_entry(&container->group_list, | |
272 | struct tce_iommu_group, next); | |
273 | table_group = iommu_group_get_iommudata(tcegrp->grp); | |
0eaf4def AK |
274 | if (!table_group) |
275 | return -ENODEV; | |
276 | ||
4793d65d AK |
277 | if (!table_group->tce32_size) |
278 | return -EPERM; | |
279 | ||
280 | locked = table_group->tce32_size >> PAGE_SHIFT; | |
2d270df8 AK |
281 | ret = try_increment_locked_vm(locked); |
282 | if (ret) | |
283 | return ret; | |
5ffd229c | 284 | |
2d270df8 AK |
285 | container->locked_pages = locked; |
286 | ||
287 | container->enabled = true; | |
5ffd229c AK |
288 | |
289 | return ret; | |
290 | } | |
291 | ||
292 | static void tce_iommu_disable(struct tce_container *container) | |
293 | { | |
294 | if (!container->enabled) | |
295 | return; | |
296 | ||
297 | container->enabled = false; | |
298 | ||
2d270df8 | 299 | if (!current->mm) |
5ffd229c AK |
300 | return; |
301 | ||
2d270df8 | 302 | decrement_locked_vm(container->locked_pages); |
5ffd229c AK |
303 | } |
304 | ||
305 | static void *tce_iommu_open(unsigned long arg) | |
306 | { | |
307 | struct tce_container *container; | |
308 | ||
2157e7b8 | 309 | if ((arg != VFIO_SPAPR_TCE_IOMMU) && (arg != VFIO_SPAPR_TCE_v2_IOMMU)) { |
5ffd229c AK |
310 | pr_err("tce_vfio: Wrong IOMMU type\n"); |
311 | return ERR_PTR(-EINVAL); | |
312 | } | |
313 | ||
314 | container = kzalloc(sizeof(*container), GFP_KERNEL); | |
315 | if (!container) | |
316 | return ERR_PTR(-ENOMEM); | |
317 | ||
318 | mutex_init(&container->lock); | |
2157e7b8 AK |
319 | INIT_LIST_HEAD_RCU(&container->group_list); |
320 | ||
321 | container->v2 = arg == VFIO_SPAPR_TCE_v2_IOMMU; | |
5ffd229c AK |
322 | |
323 | return container; | |
324 | } | |
325 | ||
2157e7b8 AK |
326 | static int tce_iommu_clear(struct tce_container *container, |
327 | struct iommu_table *tbl, | |
328 | unsigned long entry, unsigned long pages); | |
329 | static void tce_iommu_free_table(struct iommu_table *tbl); | |
330 | ||
5ffd229c AK |
331 | static void tce_iommu_release(void *iommu_data) |
332 | { | |
333 | struct tce_container *container = iommu_data; | |
2157e7b8 AK |
334 | struct tce_iommu_group *tcegrp; |
335 | long i; | |
5ffd229c | 336 | |
2157e7b8 AK |
337 | while (tce_groups_attached(container)) { |
338 | tcegrp = list_first_entry(&container->group_list, | |
339 | struct tce_iommu_group, next); | |
2157e7b8 AK |
340 | tce_iommu_detach_group(iommu_data, tcegrp->grp); |
341 | } | |
5ffd229c | 342 | |
2157e7b8 AK |
343 | /* |
344 | * If VFIO created a table, it was not disposed | |
345 | * by tce_iommu_detach_group() so do it now. | |
346 | */ | |
347 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { | |
348 | struct iommu_table *tbl = container->tables[i]; | |
349 | ||
350 | if (!tbl) | |
351 | continue; | |
352 | ||
353 | tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size); | |
354 | tce_iommu_free_table(tbl); | |
355 | } | |
5ffd229c | 356 | |
649354b7 | 357 | tce_iommu_disable(container); |
5ffd229c AK |
358 | mutex_destroy(&container->lock); |
359 | ||
360 | kfree(container); | |
361 | } | |
362 | ||
649354b7 | 363 | static void tce_iommu_unuse_page(struct tce_container *container, |
05c6cfb9 | 364 | unsigned long hpa) |
649354b7 AK |
365 | { |
366 | struct page *page; | |
367 | ||
05c6cfb9 | 368 | page = pfn_to_page(hpa >> PAGE_SHIFT); |
649354b7 AK |
369 | put_page(page); |
370 | } | |
371 | ||
2157e7b8 AK |
372 | static int tce_iommu_prereg_ua_to_hpa(unsigned long tce, unsigned long size, |
373 | unsigned long *phpa, struct mm_iommu_table_group_mem_t **pmem) | |
374 | { | |
375 | long ret = 0; | |
376 | struct mm_iommu_table_group_mem_t *mem; | |
377 | ||
378 | mem = mm_iommu_lookup(tce, size); | |
379 | if (!mem) | |
380 | return -EINVAL; | |
381 | ||
382 | ret = mm_iommu_ua_to_hpa(mem, tce, phpa); | |
383 | if (ret) | |
384 | return -EINVAL; | |
385 | ||
386 | *pmem = mem; | |
387 | ||
388 | return 0; | |
389 | } | |
390 | ||
391 | static void tce_iommu_unuse_page_v2(struct iommu_table *tbl, | |
392 | unsigned long entry) | |
393 | { | |
394 | struct mm_iommu_table_group_mem_t *mem = NULL; | |
395 | int ret; | |
396 | unsigned long hpa = 0; | |
397 | unsigned long *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl, entry); | |
398 | ||
399 | if (!pua || !current || !current->mm) | |
400 | return; | |
401 | ||
402 | ret = tce_iommu_prereg_ua_to_hpa(*pua, IOMMU_PAGE_SIZE(tbl), | |
403 | &hpa, &mem); | |
404 | if (ret) | |
405 | pr_debug("%s: tce %lx at #%lx was not cached, ret=%d\n", | |
406 | __func__, *pua, entry, ret); | |
407 | if (mem) | |
408 | mm_iommu_mapped_dec(mem); | |
409 | ||
410 | *pua = 0; | |
411 | } | |
412 | ||
9b14a1ff AK |
413 | static int tce_iommu_clear(struct tce_container *container, |
414 | struct iommu_table *tbl, | |
415 | unsigned long entry, unsigned long pages) | |
416 | { | |
05c6cfb9 AK |
417 | unsigned long oldhpa; |
418 | long ret; | |
419 | enum dma_data_direction direction; | |
9b14a1ff AK |
420 | |
421 | for ( ; pages; --pages, ++entry) { | |
05c6cfb9 AK |
422 | direction = DMA_NONE; |
423 | oldhpa = 0; | |
424 | ret = iommu_tce_xchg(tbl, entry, &oldhpa, &direction); | |
425 | if (ret) | |
426 | continue; | |
427 | ||
428 | if (direction == DMA_NONE) | |
9b14a1ff AK |
429 | continue; |
430 | ||
2157e7b8 AK |
431 | if (container->v2) { |
432 | tce_iommu_unuse_page_v2(tbl, entry); | |
433 | continue; | |
434 | } | |
435 | ||
05c6cfb9 | 436 | tce_iommu_unuse_page(container, oldhpa); |
9b14a1ff AK |
437 | } |
438 | ||
439 | return 0; | |
440 | } | |
441 | ||
649354b7 AK |
442 | static int tce_iommu_use_page(unsigned long tce, unsigned long *hpa) |
443 | { | |
444 | struct page *page = NULL; | |
445 | enum dma_data_direction direction = iommu_tce_direction(tce); | |
446 | ||
447 | if (get_user_pages_fast(tce & PAGE_MASK, 1, | |
448 | direction != DMA_TO_DEVICE, &page) != 1) | |
449 | return -EFAULT; | |
450 | ||
451 | *hpa = __pa((unsigned long) page_address(page)); | |
452 | ||
453 | return 0; | |
454 | } | |
455 | ||
9b14a1ff AK |
456 | static long tce_iommu_build(struct tce_container *container, |
457 | struct iommu_table *tbl, | |
05c6cfb9 AK |
458 | unsigned long entry, unsigned long tce, unsigned long pages, |
459 | enum dma_data_direction direction) | |
9b14a1ff AK |
460 | { |
461 | long i, ret = 0; | |
649354b7 AK |
462 | struct page *page; |
463 | unsigned long hpa; | |
05c6cfb9 | 464 | enum dma_data_direction dirtmp; |
9b14a1ff AK |
465 | |
466 | for (i = 0; i < pages; ++i) { | |
467 | unsigned long offset = tce & IOMMU_PAGE_MASK(tbl) & ~PAGE_MASK; | |
468 | ||
649354b7 AK |
469 | ret = tce_iommu_use_page(tce, &hpa); |
470 | if (ret) | |
9b14a1ff | 471 | break; |
e432bc7e | 472 | |
649354b7 | 473 | page = pfn_to_page(hpa >> PAGE_SHIFT); |
e432bc7e AK |
474 | if (!tce_page_is_contained(page, tbl->it_page_shift)) { |
475 | ret = -EPERM; | |
476 | break; | |
477 | } | |
478 | ||
649354b7 | 479 | hpa |= offset; |
05c6cfb9 AK |
480 | dirtmp = direction; |
481 | ret = iommu_tce_xchg(tbl, entry + i, &hpa, &dirtmp); | |
9b14a1ff | 482 | if (ret) { |
649354b7 | 483 | tce_iommu_unuse_page(container, hpa); |
9b14a1ff AK |
484 | pr_err("iommu_tce: %s failed ioba=%lx, tce=%lx, ret=%ld\n", |
485 | __func__, entry << tbl->it_page_shift, | |
486 | tce, ret); | |
487 | break; | |
488 | } | |
05c6cfb9 AK |
489 | |
490 | if (dirtmp != DMA_NONE) | |
491 | tce_iommu_unuse_page(container, hpa); | |
492 | ||
00663d4e | 493 | tce += IOMMU_PAGE_SIZE(tbl); |
9b14a1ff AK |
494 | } |
495 | ||
496 | if (ret) | |
497 | tce_iommu_clear(container, tbl, entry, i); | |
498 | ||
499 | return ret; | |
500 | } | |
501 | ||
2157e7b8 AK |
502 | static long tce_iommu_build_v2(struct tce_container *container, |
503 | struct iommu_table *tbl, | |
504 | unsigned long entry, unsigned long tce, unsigned long pages, | |
505 | enum dma_data_direction direction) | |
506 | { | |
507 | long i, ret = 0; | |
508 | struct page *page; | |
509 | unsigned long hpa; | |
510 | enum dma_data_direction dirtmp; | |
511 | ||
512 | for (i = 0; i < pages; ++i) { | |
513 | struct mm_iommu_table_group_mem_t *mem = NULL; | |
514 | unsigned long *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl, | |
515 | entry + i); | |
516 | ||
517 | ret = tce_iommu_prereg_ua_to_hpa(tce, IOMMU_PAGE_SIZE(tbl), | |
518 | &hpa, &mem); | |
519 | if (ret) | |
520 | break; | |
521 | ||
522 | page = pfn_to_page(hpa >> PAGE_SHIFT); | |
523 | if (!tce_page_is_contained(page, tbl->it_page_shift)) { | |
524 | ret = -EPERM; | |
525 | break; | |
526 | } | |
527 | ||
528 | /* Preserve offset within IOMMU page */ | |
529 | hpa |= tce & IOMMU_PAGE_MASK(tbl) & ~PAGE_MASK; | |
530 | dirtmp = direction; | |
531 | ||
532 | /* The registered region is being unregistered */ | |
533 | if (mm_iommu_mapped_inc(mem)) | |
534 | break; | |
535 | ||
536 | ret = iommu_tce_xchg(tbl, entry + i, &hpa, &dirtmp); | |
537 | if (ret) { | |
538 | /* dirtmp cannot be DMA_NONE here */ | |
539 | tce_iommu_unuse_page_v2(tbl, entry + i); | |
540 | pr_err("iommu_tce: %s failed ioba=%lx, tce=%lx, ret=%ld\n", | |
541 | __func__, entry << tbl->it_page_shift, | |
542 | tce, ret); | |
543 | break; | |
544 | } | |
545 | ||
546 | if (dirtmp != DMA_NONE) | |
547 | tce_iommu_unuse_page_v2(tbl, entry + i); | |
548 | ||
549 | *pua = tce; | |
550 | ||
551 | tce += IOMMU_PAGE_SIZE(tbl); | |
552 | } | |
553 | ||
554 | if (ret) | |
555 | tce_iommu_clear(container, tbl, entry, i); | |
556 | ||
557 | return ret; | |
558 | } | |
559 | ||
46d3e1e1 AK |
560 | static long tce_iommu_create_table(struct tce_container *container, |
561 | struct iommu_table_group *table_group, | |
562 | int num, | |
563 | __u32 page_shift, | |
564 | __u64 window_size, | |
565 | __u32 levels, | |
566 | struct iommu_table **ptbl) | |
567 | { | |
568 | long ret, table_size; | |
569 | ||
570 | table_size = table_group->ops->get_table_size(page_shift, window_size, | |
571 | levels); | |
572 | if (!table_size) | |
573 | return -EINVAL; | |
574 | ||
575 | ret = try_increment_locked_vm(table_size >> PAGE_SHIFT); | |
576 | if (ret) | |
577 | return ret; | |
578 | ||
579 | ret = table_group->ops->create_table(table_group, num, | |
580 | page_shift, window_size, levels, ptbl); | |
581 | ||
582 | WARN_ON(!ret && !(*ptbl)->it_ops->free); | |
583 | WARN_ON(!ret && ((*ptbl)->it_allocated_size != table_size)); | |
584 | ||
2157e7b8 AK |
585 | if (!ret && container->v2) { |
586 | ret = tce_iommu_userspace_view_alloc(*ptbl); | |
587 | if (ret) | |
588 | (*ptbl)->it_ops->free(*ptbl); | |
589 | } | |
590 | ||
46d3e1e1 AK |
591 | if (ret) |
592 | decrement_locked_vm(table_size >> PAGE_SHIFT); | |
593 | ||
594 | return ret; | |
595 | } | |
596 | ||
597 | static void tce_iommu_free_table(struct iommu_table *tbl) | |
598 | { | |
599 | unsigned long pages = tbl->it_allocated_size >> PAGE_SHIFT; | |
600 | ||
2157e7b8 | 601 | tce_iommu_userspace_view_free(tbl); |
46d3e1e1 AK |
602 | tbl->it_ops->free(tbl); |
603 | decrement_locked_vm(pages); | |
604 | } | |
605 | ||
e633bc86 AK |
606 | static long tce_iommu_create_window(struct tce_container *container, |
607 | __u32 page_shift, __u64 window_size, __u32 levels, | |
608 | __u64 *start_addr) | |
609 | { | |
610 | struct tce_iommu_group *tcegrp; | |
611 | struct iommu_table_group *table_group; | |
612 | struct iommu_table *tbl = NULL; | |
613 | long ret, num; | |
614 | ||
615 | num = tce_iommu_find_free_table(container); | |
616 | if (num < 0) | |
617 | return num; | |
618 | ||
619 | /* Get the first group for ops::create_table */ | |
620 | tcegrp = list_first_entry(&container->group_list, | |
621 | struct tce_iommu_group, next); | |
622 | table_group = iommu_group_get_iommudata(tcegrp->grp); | |
623 | if (!table_group) | |
624 | return -EFAULT; | |
625 | ||
626 | if (!(table_group->pgsizes & (1ULL << page_shift))) | |
627 | return -EINVAL; | |
628 | ||
629 | if (!table_group->ops->set_window || !table_group->ops->unset_window || | |
630 | !table_group->ops->get_table_size || | |
631 | !table_group->ops->create_table) | |
632 | return -EPERM; | |
633 | ||
634 | /* Create TCE table */ | |
635 | ret = tce_iommu_create_table(container, table_group, num, | |
636 | page_shift, window_size, levels, &tbl); | |
637 | if (ret) | |
638 | return ret; | |
639 | ||
640 | BUG_ON(!tbl->it_ops->free); | |
641 | ||
642 | /* | |
643 | * Program the table to every group. | |
644 | * Groups have been tested for compatibility at the attach time. | |
645 | */ | |
646 | list_for_each_entry(tcegrp, &container->group_list, next) { | |
647 | table_group = iommu_group_get_iommudata(tcegrp->grp); | |
648 | ||
649 | ret = table_group->ops->set_window(table_group, num, tbl); | |
650 | if (ret) | |
651 | goto unset_exit; | |
652 | } | |
653 | ||
654 | container->tables[num] = tbl; | |
655 | ||
656 | /* Return start address assigned by platform in create_table() */ | |
657 | *start_addr = tbl->it_offset << tbl->it_page_shift; | |
658 | ||
659 | return 0; | |
660 | ||
661 | unset_exit: | |
662 | list_for_each_entry(tcegrp, &container->group_list, next) { | |
663 | table_group = iommu_group_get_iommudata(tcegrp->grp); | |
664 | table_group->ops->unset_window(table_group, num); | |
665 | } | |
666 | tce_iommu_free_table(tbl); | |
667 | ||
668 | return ret; | |
669 | } | |
670 | ||
671 | static long tce_iommu_remove_window(struct tce_container *container, | |
672 | __u64 start_addr) | |
673 | { | |
674 | struct iommu_table_group *table_group = NULL; | |
675 | struct iommu_table *tbl; | |
676 | struct tce_iommu_group *tcegrp; | |
677 | int num; | |
678 | ||
679 | num = tce_iommu_find_table(container, start_addr, &tbl); | |
680 | if (num < 0) | |
681 | return -EINVAL; | |
682 | ||
683 | BUG_ON(!tbl->it_size); | |
684 | ||
685 | /* Detach groups from IOMMUs */ | |
686 | list_for_each_entry(tcegrp, &container->group_list, next) { | |
687 | table_group = iommu_group_get_iommudata(tcegrp->grp); | |
688 | ||
689 | /* | |
690 | * SPAPR TCE IOMMU exposes the default DMA window to | |
691 | * the guest via dma32_window_start/size of | |
692 | * VFIO_IOMMU_SPAPR_TCE_GET_INFO. Some platforms allow | |
693 | * the userspace to remove this window, some do not so | |
694 | * here we check for the platform capability. | |
695 | */ | |
696 | if (!table_group->ops || !table_group->ops->unset_window) | |
697 | return -EPERM; | |
698 | ||
699 | table_group->ops->unset_window(table_group, num); | |
700 | } | |
701 | ||
702 | /* Free table */ | |
703 | tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size); | |
704 | tce_iommu_free_table(tbl); | |
705 | container->tables[num] = NULL; | |
706 | ||
707 | return 0; | |
708 | } | |
709 | ||
5ffd229c AK |
710 | static long tce_iommu_ioctl(void *iommu_data, |
711 | unsigned int cmd, unsigned long arg) | |
712 | { | |
713 | struct tce_container *container = iommu_data; | |
e633bc86 | 714 | unsigned long minsz, ddwsz; |
5ffd229c AK |
715 | long ret; |
716 | ||
717 | switch (cmd) { | |
718 | case VFIO_CHECK_EXTENSION: | |
1b69be5e GS |
719 | switch (arg) { |
720 | case VFIO_SPAPR_TCE_IOMMU: | |
2157e7b8 | 721 | case VFIO_SPAPR_TCE_v2_IOMMU: |
1b69be5e GS |
722 | ret = 1; |
723 | break; | |
724 | default: | |
725 | ret = vfio_spapr_iommu_eeh_ioctl(NULL, cmd, arg); | |
726 | break; | |
727 | } | |
728 | ||
729 | return (ret < 0) ? 0 : ret; | |
5ffd229c AK |
730 | |
731 | case VFIO_IOMMU_SPAPR_TCE_GET_INFO: { | |
732 | struct vfio_iommu_spapr_tce_info info; | |
2157e7b8 | 733 | struct tce_iommu_group *tcegrp; |
0eaf4def AK |
734 | struct iommu_table_group *table_group; |
735 | ||
2157e7b8 | 736 | if (!tce_groups_attached(container)) |
0eaf4def AK |
737 | return -ENXIO; |
738 | ||
2157e7b8 AK |
739 | tcegrp = list_first_entry(&container->group_list, |
740 | struct tce_iommu_group, next); | |
741 | table_group = iommu_group_get_iommudata(tcegrp->grp); | |
5ffd229c | 742 | |
4793d65d | 743 | if (!table_group) |
5ffd229c AK |
744 | return -ENXIO; |
745 | ||
746 | minsz = offsetofend(struct vfio_iommu_spapr_tce_info, | |
747 | dma32_window_size); | |
748 | ||
749 | if (copy_from_user(&info, (void __user *)arg, minsz)) | |
750 | return -EFAULT; | |
751 | ||
752 | if (info.argsz < minsz) | |
753 | return -EINVAL; | |
754 | ||
4793d65d AK |
755 | info.dma32_window_start = table_group->tce32_start; |
756 | info.dma32_window_size = table_group->tce32_size; | |
5ffd229c | 757 | info.flags = 0; |
e633bc86 AK |
758 | memset(&info.ddw, 0, sizeof(info.ddw)); |
759 | ||
760 | if (table_group->max_dynamic_windows_supported && | |
761 | container->v2) { | |
762 | info.flags |= VFIO_IOMMU_SPAPR_INFO_DDW; | |
763 | info.ddw.pgsizes = table_group->pgsizes; | |
764 | info.ddw.max_dynamic_windows_supported = | |
765 | table_group->max_dynamic_windows_supported; | |
766 | info.ddw.levels = table_group->max_levels; | |
767 | } | |
768 | ||
769 | ddwsz = offsetofend(struct vfio_iommu_spapr_tce_info, ddw); | |
770 | ||
771 | if (info.argsz >= ddwsz) | |
772 | minsz = ddwsz; | |
5ffd229c AK |
773 | |
774 | if (copy_to_user((void __user *)arg, &info, minsz)) | |
775 | return -EFAULT; | |
776 | ||
777 | return 0; | |
778 | } | |
779 | case VFIO_IOMMU_MAP_DMA: { | |
780 | struct vfio_iommu_type1_dma_map param; | |
0eaf4def | 781 | struct iommu_table *tbl = NULL; |
0eaf4def | 782 | long num; |
05c6cfb9 | 783 | enum dma_data_direction direction; |
5ffd229c | 784 | |
3c56e822 AK |
785 | if (!container->enabled) |
786 | return -EPERM; | |
787 | ||
5ffd229c AK |
788 | minsz = offsetofend(struct vfio_iommu_type1_dma_map, size); |
789 | ||
790 | if (copy_from_user(¶m, (void __user *)arg, minsz)) | |
791 | return -EFAULT; | |
792 | ||
793 | if (param.argsz < minsz) | |
794 | return -EINVAL; | |
795 | ||
796 | if (param.flags & ~(VFIO_DMA_MAP_FLAG_READ | | |
797 | VFIO_DMA_MAP_FLAG_WRITE)) | |
798 | return -EINVAL; | |
799 | ||
0eaf4def AK |
800 | num = tce_iommu_find_table(container, param.iova, &tbl); |
801 | if (num < 0) | |
802 | return -ENXIO; | |
803 | ||
00663d4e AK |
804 | if ((param.size & ~IOMMU_PAGE_MASK(tbl)) || |
805 | (param.vaddr & ~IOMMU_PAGE_MASK(tbl))) | |
5ffd229c AK |
806 | return -EINVAL; |
807 | ||
808 | /* iova is checked by the IOMMU API */ | |
05c6cfb9 AK |
809 | if (param.flags & VFIO_DMA_MAP_FLAG_READ) { |
810 | if (param.flags & VFIO_DMA_MAP_FLAG_WRITE) | |
811 | direction = DMA_BIDIRECTIONAL; | |
812 | else | |
813 | direction = DMA_TO_DEVICE; | |
814 | } else { | |
815 | if (param.flags & VFIO_DMA_MAP_FLAG_WRITE) | |
816 | direction = DMA_FROM_DEVICE; | |
817 | else | |
818 | return -EINVAL; | |
819 | } | |
5ffd229c | 820 | |
05c6cfb9 | 821 | ret = iommu_tce_put_param_check(tbl, param.iova, param.vaddr); |
5ffd229c AK |
822 | if (ret) |
823 | return ret; | |
824 | ||
2157e7b8 AK |
825 | if (container->v2) |
826 | ret = tce_iommu_build_v2(container, tbl, | |
827 | param.iova >> tbl->it_page_shift, | |
828 | param.vaddr, | |
829 | param.size >> tbl->it_page_shift, | |
830 | direction); | |
831 | else | |
832 | ret = tce_iommu_build(container, tbl, | |
833 | param.iova >> tbl->it_page_shift, | |
834 | param.vaddr, | |
835 | param.size >> tbl->it_page_shift, | |
836 | direction); | |
5ffd229c AK |
837 | |
838 | iommu_flush_tce(tbl); | |
839 | ||
840 | return ret; | |
841 | } | |
842 | case VFIO_IOMMU_UNMAP_DMA: { | |
843 | struct vfio_iommu_type1_dma_unmap param; | |
0eaf4def AK |
844 | struct iommu_table *tbl = NULL; |
845 | long num; | |
5ffd229c | 846 | |
3c56e822 AK |
847 | if (!container->enabled) |
848 | return -EPERM; | |
849 | ||
5ffd229c AK |
850 | minsz = offsetofend(struct vfio_iommu_type1_dma_unmap, |
851 | size); | |
852 | ||
853 | if (copy_from_user(¶m, (void __user *)arg, minsz)) | |
854 | return -EFAULT; | |
855 | ||
856 | if (param.argsz < minsz) | |
857 | return -EINVAL; | |
858 | ||
859 | /* No flag is supported now */ | |
860 | if (param.flags) | |
861 | return -EINVAL; | |
862 | ||
0eaf4def AK |
863 | num = tce_iommu_find_table(container, param.iova, &tbl); |
864 | if (num < 0) | |
865 | return -ENXIO; | |
866 | ||
00663d4e | 867 | if (param.size & ~IOMMU_PAGE_MASK(tbl)) |
5ffd229c AK |
868 | return -EINVAL; |
869 | ||
870 | ret = iommu_tce_clear_param_check(tbl, param.iova, 0, | |
00663d4e | 871 | param.size >> tbl->it_page_shift); |
5ffd229c AK |
872 | if (ret) |
873 | return ret; | |
874 | ||
9b14a1ff | 875 | ret = tce_iommu_clear(container, tbl, |
00663d4e AK |
876 | param.iova >> tbl->it_page_shift, |
877 | param.size >> tbl->it_page_shift); | |
5ffd229c AK |
878 | iommu_flush_tce(tbl); |
879 | ||
880 | return ret; | |
881 | } | |
2157e7b8 AK |
882 | case VFIO_IOMMU_SPAPR_REGISTER_MEMORY: { |
883 | struct vfio_iommu_spapr_register_memory param; | |
884 | ||
885 | if (!container->v2) | |
886 | break; | |
887 | ||
888 | minsz = offsetofend(struct vfio_iommu_spapr_register_memory, | |
889 | size); | |
890 | ||
891 | if (copy_from_user(¶m, (void __user *)arg, minsz)) | |
892 | return -EFAULT; | |
893 | ||
894 | if (param.argsz < minsz) | |
895 | return -EINVAL; | |
896 | ||
897 | /* No flag is supported now */ | |
898 | if (param.flags) | |
899 | return -EINVAL; | |
900 | ||
901 | mutex_lock(&container->lock); | |
902 | ret = tce_iommu_register_pages(container, param.vaddr, | |
903 | param.size); | |
904 | mutex_unlock(&container->lock); | |
905 | ||
906 | return ret; | |
907 | } | |
908 | case VFIO_IOMMU_SPAPR_UNREGISTER_MEMORY: { | |
909 | struct vfio_iommu_spapr_register_memory param; | |
910 | ||
911 | if (!container->v2) | |
912 | break; | |
913 | ||
914 | minsz = offsetofend(struct vfio_iommu_spapr_register_memory, | |
915 | size); | |
916 | ||
917 | if (copy_from_user(¶m, (void __user *)arg, minsz)) | |
918 | return -EFAULT; | |
919 | ||
920 | if (param.argsz < minsz) | |
921 | return -EINVAL; | |
922 | ||
923 | /* No flag is supported now */ | |
924 | if (param.flags) | |
925 | return -EINVAL; | |
926 | ||
927 | mutex_lock(&container->lock); | |
928 | ret = tce_iommu_unregister_pages(container, param.vaddr, | |
929 | param.size); | |
930 | mutex_unlock(&container->lock); | |
931 | ||
932 | return ret; | |
933 | } | |
5ffd229c | 934 | case VFIO_IOMMU_ENABLE: |
2157e7b8 AK |
935 | if (container->v2) |
936 | break; | |
937 | ||
5ffd229c AK |
938 | mutex_lock(&container->lock); |
939 | ret = tce_iommu_enable(container); | |
940 | mutex_unlock(&container->lock); | |
941 | return ret; | |
942 | ||
943 | ||
944 | case VFIO_IOMMU_DISABLE: | |
2157e7b8 AK |
945 | if (container->v2) |
946 | break; | |
947 | ||
5ffd229c AK |
948 | mutex_lock(&container->lock); |
949 | tce_iommu_disable(container); | |
950 | mutex_unlock(&container->lock); | |
951 | return 0; | |
1b69be5e | 952 | |
2157e7b8 AK |
953 | case VFIO_EEH_PE_OP: { |
954 | struct tce_iommu_group *tcegrp; | |
955 | ||
956 | ret = 0; | |
957 | list_for_each_entry(tcegrp, &container->group_list, next) { | |
958 | ret = vfio_spapr_iommu_eeh_ioctl(tcegrp->grp, | |
959 | cmd, arg); | |
960 | if (ret) | |
961 | return ret; | |
962 | } | |
963 | return ret; | |
964 | } | |
965 | ||
e633bc86 AK |
966 | case VFIO_IOMMU_SPAPR_TCE_CREATE: { |
967 | struct vfio_iommu_spapr_tce_create create; | |
968 | ||
969 | if (!container->v2) | |
970 | break; | |
971 | ||
972 | if (!tce_groups_attached(container)) | |
973 | return -ENXIO; | |
974 | ||
975 | minsz = offsetofend(struct vfio_iommu_spapr_tce_create, | |
976 | start_addr); | |
977 | ||
978 | if (copy_from_user(&create, (void __user *)arg, minsz)) | |
979 | return -EFAULT; | |
980 | ||
981 | if (create.argsz < minsz) | |
982 | return -EINVAL; | |
983 | ||
984 | if (create.flags) | |
985 | return -EINVAL; | |
986 | ||
987 | mutex_lock(&container->lock); | |
988 | ||
989 | ret = tce_iommu_create_window(container, create.page_shift, | |
990 | create.window_size, create.levels, | |
991 | &create.start_addr); | |
992 | ||
993 | mutex_unlock(&container->lock); | |
994 | ||
995 | if (!ret && copy_to_user((void __user *)arg, &create, minsz)) | |
996 | ret = -EFAULT; | |
997 | ||
998 | return ret; | |
999 | } | |
1000 | case VFIO_IOMMU_SPAPR_TCE_REMOVE: { | |
1001 | struct vfio_iommu_spapr_tce_remove remove; | |
1002 | ||
1003 | if (!container->v2) | |
1004 | break; | |
1005 | ||
1006 | if (!tce_groups_attached(container)) | |
1007 | return -ENXIO; | |
1008 | ||
1009 | minsz = offsetofend(struct vfio_iommu_spapr_tce_remove, | |
1010 | start_addr); | |
1011 | ||
1012 | if (copy_from_user(&remove, (void __user *)arg, minsz)) | |
1013 | return -EFAULT; | |
1014 | ||
1015 | if (remove.argsz < minsz) | |
1016 | return -EINVAL; | |
1017 | ||
1018 | if (remove.flags) | |
1019 | return -EINVAL; | |
1020 | ||
1021 | mutex_lock(&container->lock); | |
1022 | ||
1023 | ret = tce_iommu_remove_window(container, remove.start_addr); | |
1024 | ||
1025 | mutex_unlock(&container->lock); | |
1026 | ||
1027 | return ret; | |
1028 | } | |
5ffd229c AK |
1029 | } |
1030 | ||
1031 | return -ENOTTY; | |
1032 | } | |
1033 | ||
f87a8864 AK |
1034 | static void tce_iommu_release_ownership(struct tce_container *container, |
1035 | struct iommu_table_group *table_group) | |
1036 | { | |
1037 | int i; | |
1038 | ||
1039 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { | |
2157e7b8 | 1040 | struct iommu_table *tbl = container->tables[i]; |
f87a8864 AK |
1041 | |
1042 | if (!tbl) | |
1043 | continue; | |
1044 | ||
1045 | tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size); | |
2157e7b8 | 1046 | tce_iommu_userspace_view_free(tbl); |
f87a8864 AK |
1047 | if (tbl->it_map) |
1048 | iommu_release_ownership(tbl); | |
2157e7b8 AK |
1049 | |
1050 | container->tables[i] = NULL; | |
f87a8864 AK |
1051 | } |
1052 | } | |
1053 | ||
1054 | static int tce_iommu_take_ownership(struct tce_container *container, | |
1055 | struct iommu_table_group *table_group) | |
1056 | { | |
1057 | int i, j, rc = 0; | |
1058 | ||
1059 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { | |
1060 | struct iommu_table *tbl = table_group->tables[i]; | |
1061 | ||
1062 | if (!tbl || !tbl->it_map) | |
1063 | continue; | |
1064 | ||
2157e7b8 AK |
1065 | rc = tce_iommu_userspace_view_alloc(tbl); |
1066 | if (!rc) | |
1067 | rc = iommu_take_ownership(tbl); | |
1068 | ||
f87a8864 AK |
1069 | if (rc) { |
1070 | for (j = 0; j < i; ++j) | |
1071 | iommu_release_ownership( | |
1072 | table_group->tables[j]); | |
1073 | ||
1074 | return rc; | |
1075 | } | |
1076 | } | |
1077 | ||
2157e7b8 AK |
1078 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) |
1079 | container->tables[i] = table_group->tables[i]; | |
1080 | ||
f87a8864 AK |
1081 | return 0; |
1082 | } | |
1083 | ||
1084 | static void tce_iommu_release_ownership_ddw(struct tce_container *container, | |
1085 | struct iommu_table_group *table_group) | |
1086 | { | |
46d3e1e1 AK |
1087 | long i; |
1088 | ||
1089 | if (!table_group->ops->unset_window) { | |
1090 | WARN_ON_ONCE(1); | |
1091 | return; | |
1092 | } | |
1093 | ||
2157e7b8 | 1094 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) |
46d3e1e1 | 1095 | table_group->ops->unset_window(table_group, i); |
46d3e1e1 | 1096 | |
f87a8864 AK |
1097 | table_group->ops->release_ownership(table_group); |
1098 | } | |
1099 | ||
1100 | static long tce_iommu_take_ownership_ddw(struct tce_container *container, | |
1101 | struct iommu_table_group *table_group) | |
1102 | { | |
2157e7b8 | 1103 | long i, ret = 0; |
46d3e1e1 AK |
1104 | struct iommu_table *tbl = NULL; |
1105 | ||
1106 | if (!table_group->ops->create_table || !table_group->ops->set_window || | |
1107 | !table_group->ops->release_ownership) { | |
1108 | WARN_ON_ONCE(1); | |
1109 | return -EFAULT; | |
1110 | } | |
1111 | ||
f87a8864 AK |
1112 | table_group->ops->take_ownership(table_group); |
1113 | ||
2157e7b8 AK |
1114 | /* |
1115 | * If it the first group attached, check if there is | |
1116 | * a default DMA window and create one if none as | |
1117 | * the userspace expects it to exist. | |
1118 | */ | |
1119 | if (!tce_groups_attached(container) && !container->tables[0]) { | |
1120 | ret = tce_iommu_create_table(container, | |
1121 | table_group, | |
1122 | 0, /* window number */ | |
1123 | IOMMU_PAGE_SHIFT_4K, | |
1124 | table_group->tce32_size, | |
1125 | 1, /* default levels */ | |
1126 | &tbl); | |
46d3e1e1 | 1127 | if (ret) |
2157e7b8 | 1128 | goto release_exit; |
46d3e1e1 | 1129 | else |
2157e7b8 | 1130 | container->tables[0] = tbl; |
46d3e1e1 AK |
1131 | } |
1132 | ||
2157e7b8 AK |
1133 | /* Set all windows to the new group */ |
1134 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { | |
1135 | tbl = container->tables[i]; | |
1136 | ||
1137 | if (!tbl) | |
1138 | continue; | |
1139 | ||
1140 | /* Set the default window to a new group */ | |
1141 | ret = table_group->ops->set_window(table_group, i, tbl); | |
1142 | if (ret) | |
1143 | goto release_exit; | |
1144 | } | |
1145 | ||
1146 | return 0; | |
1147 | ||
1148 | release_exit: | |
1149 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) | |
1150 | table_group->ops->unset_window(table_group, i); | |
1151 | ||
1152 | table_group->ops->release_ownership(table_group); | |
46d3e1e1 AK |
1153 | |
1154 | return ret; | |
f87a8864 AK |
1155 | } |
1156 | ||
5ffd229c AK |
1157 | static int tce_iommu_attach_group(void *iommu_data, |
1158 | struct iommu_group *iommu_group) | |
1159 | { | |
1160 | int ret; | |
1161 | struct tce_container *container = iommu_data; | |
0eaf4def | 1162 | struct iommu_table_group *table_group; |
2157e7b8 | 1163 | struct tce_iommu_group *tcegrp = NULL; |
5ffd229c | 1164 | |
5ffd229c AK |
1165 | mutex_lock(&container->lock); |
1166 | ||
1167 | /* pr_debug("tce_vfio: Attaching group #%u to iommu %p\n", | |
1168 | iommu_group_id(iommu_group), iommu_group); */ | |
2157e7b8 AK |
1169 | table_group = iommu_group_get_iommudata(iommu_group); |
1170 | ||
1171 | if (tce_groups_attached(container) && (!table_group->ops || | |
1172 | !table_group->ops->take_ownership || | |
1173 | !table_group->ops->release_ownership)) { | |
5ffd229c | 1174 | ret = -EBUSY; |
22af4859 AK |
1175 | goto unlock_exit; |
1176 | } | |
1177 | ||
2157e7b8 AK |
1178 | /* Check if new group has the same iommu_ops (i.e. compatible) */ |
1179 | list_for_each_entry(tcegrp, &container->group_list, next) { | |
1180 | struct iommu_table_group *table_group_tmp; | |
1181 | ||
1182 | if (tcegrp->grp == iommu_group) { | |
1183 | pr_warn("tce_vfio: Group %d is already attached\n", | |
1184 | iommu_group_id(iommu_group)); | |
1185 | ret = -EBUSY; | |
1186 | goto unlock_exit; | |
1187 | } | |
1188 | table_group_tmp = iommu_group_get_iommudata(tcegrp->grp); | |
54de285b AK |
1189 | if (table_group_tmp->ops->create_table != |
1190 | table_group->ops->create_table) { | |
2157e7b8 AK |
1191 | pr_warn("tce_vfio: Group %d is incompatible with group %d\n", |
1192 | iommu_group_id(iommu_group), | |
1193 | iommu_group_id(tcegrp->grp)); | |
1194 | ret = -EPERM; | |
1195 | goto unlock_exit; | |
1196 | } | |
5ffd229c AK |
1197 | } |
1198 | ||
2157e7b8 AK |
1199 | tcegrp = kzalloc(sizeof(*tcegrp), GFP_KERNEL); |
1200 | if (!tcegrp) { | |
1201 | ret = -ENOMEM; | |
0eaf4def AK |
1202 | goto unlock_exit; |
1203 | } | |
1204 | ||
f87a8864 AK |
1205 | if (!table_group->ops || !table_group->ops->take_ownership || |
1206 | !table_group->ops->release_ownership) | |
1207 | ret = tce_iommu_take_ownership(container, table_group); | |
1208 | else | |
1209 | ret = tce_iommu_take_ownership_ddw(container, table_group); | |
1210 | ||
2157e7b8 AK |
1211 | if (!ret) { |
1212 | tcegrp->grp = iommu_group; | |
1213 | list_add(&tcegrp->next, &container->group_list); | |
1214 | } | |
22af4859 AK |
1215 | |
1216 | unlock_exit: | |
2157e7b8 AK |
1217 | if (ret && tcegrp) |
1218 | kfree(tcegrp); | |
1219 | ||
5ffd229c AK |
1220 | mutex_unlock(&container->lock); |
1221 | ||
1222 | return ret; | |
1223 | } | |
1224 | ||
1225 | static void tce_iommu_detach_group(void *iommu_data, | |
1226 | struct iommu_group *iommu_group) | |
1227 | { | |
1228 | struct tce_container *container = iommu_data; | |
0eaf4def | 1229 | struct iommu_table_group *table_group; |
2157e7b8 AK |
1230 | bool found = false; |
1231 | struct tce_iommu_group *tcegrp; | |
5ffd229c | 1232 | |
5ffd229c | 1233 | mutex_lock(&container->lock); |
2157e7b8 AK |
1234 | |
1235 | list_for_each_entry(tcegrp, &container->group_list, next) { | |
1236 | if (tcegrp->grp == iommu_group) { | |
1237 | found = true; | |
1238 | break; | |
1239 | } | |
22af4859 | 1240 | } |
5ffd229c | 1241 | |
2157e7b8 AK |
1242 | if (!found) { |
1243 | pr_warn("tce_vfio: detaching unattached group #%u\n", | |
1244 | iommu_group_id(iommu_group)); | |
1245 | goto unlock_exit; | |
5ffd229c | 1246 | } |
22af4859 | 1247 | |
2157e7b8 AK |
1248 | list_del(&tcegrp->next); |
1249 | kfree(tcegrp); | |
0eaf4def AK |
1250 | |
1251 | table_group = iommu_group_get_iommudata(iommu_group); | |
1252 | BUG_ON(!table_group); | |
1253 | ||
f87a8864 AK |
1254 | if (!table_group->ops || !table_group->ops->release_ownership) |
1255 | tce_iommu_release_ownership(container, table_group); | |
1256 | else | |
1257 | tce_iommu_release_ownership_ddw(container, table_group); | |
22af4859 AK |
1258 | |
1259 | unlock_exit: | |
5ffd229c AK |
1260 | mutex_unlock(&container->lock); |
1261 | } | |
1262 | ||
1263 | const struct vfio_iommu_driver_ops tce_iommu_driver_ops = { | |
1264 | .name = "iommu-vfio-powerpc", | |
1265 | .owner = THIS_MODULE, | |
1266 | .open = tce_iommu_open, | |
1267 | .release = tce_iommu_release, | |
1268 | .ioctl = tce_iommu_ioctl, | |
1269 | .attach_group = tce_iommu_attach_group, | |
1270 | .detach_group = tce_iommu_detach_group, | |
1271 | }; | |
1272 | ||
1273 | static int __init tce_iommu_init(void) | |
1274 | { | |
1275 | return vfio_register_iommu_driver(&tce_iommu_driver_ops); | |
1276 | } | |
1277 | ||
1278 | static void __exit tce_iommu_cleanup(void) | |
1279 | { | |
1280 | vfio_unregister_iommu_driver(&tce_iommu_driver_ops); | |
1281 | } | |
1282 | ||
1283 | module_init(tce_iommu_init); | |
1284 | module_exit(tce_iommu_cleanup); | |
1285 | ||
1286 | MODULE_VERSION(DRIVER_VERSION); | |
1287 | MODULE_LICENSE("GPL v2"); | |
1288 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
1289 | MODULE_DESCRIPTION(DRIVER_DESC); | |
1290 |