Commit | Line | Data |
---|---|---|
d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
5ffd229c AK |
2 | /* |
3 | * VFIO: IOMMU DMA mapping support for TCE on POWER | |
4 | * | |
5 | * Copyright (C) 2013 IBM Corp. All rights reserved. | |
6 | * Author: Alexey Kardashevskiy <aik@ozlabs.ru> | |
7 | * | |
5ffd229c AK |
8 | * Derived from original vfio_iommu_type1.c: |
9 | * Copyright (C) 2012 Red Hat, Inc. All rights reserved. | |
10 | * Author: Alex Williamson <alex.williamson@redhat.com> | |
11 | */ | |
12 | ||
13 | #include <linux/module.h> | |
14 | #include <linux/pci.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/uaccess.h> | |
17 | #include <linux/err.h> | |
18 | #include <linux/vfio.h> | |
2157e7b8 | 19 | #include <linux/vmalloc.h> |
6e84f315 | 20 | #include <linux/sched/mm.h> |
3f07c014 | 21 | #include <linux/sched/signal.h> |
79eb597c | 22 | #include <linux/mm.h> |
6e84f315 | 23 | |
5ffd229c AK |
24 | #include <asm/iommu.h> |
25 | #include <asm/tce.h> | |
2157e7b8 | 26 | #include <asm/mmu_context.h> |
5ffd229c AK |
27 | |
28 | #define DRIVER_VERSION "0.1" | |
29 | #define DRIVER_AUTHOR "aik@ozlabs.ru" | |
30 | #define DRIVER_DESC "VFIO IOMMU SPAPR TCE" | |
31 | ||
32 | static void tce_iommu_detach_group(void *iommu_data, | |
33 | struct iommu_group *iommu_group); | |
34 | ||
35 | /* | |
36 | * VFIO IOMMU fd for SPAPR_TCE IOMMU implementation | |
37 | * | |
38 | * This code handles mapping and unmapping of user data buffers | |
39 | * into DMA'ble space using the IOMMU | |
40 | */ | |
41 | ||
2157e7b8 AK |
42 | struct tce_iommu_group { |
43 | struct list_head next; | |
44 | struct iommu_group *grp; | |
45 | }; | |
46 | ||
4b6fad70 AK |
47 | /* |
48 | * A container needs to remember which preregistered region it has | |
49 | * referenced to do proper cleanup at the userspace process exit. | |
50 | */ | |
51 | struct tce_iommu_prereg { | |
52 | struct list_head next; | |
53 | struct mm_iommu_table_group_mem_t *mem; | |
54 | }; | |
55 | ||
5ffd229c AK |
56 | /* |
57 | * The container descriptor supports only a single group per container. | |
58 | * Required by the API as the container is not supplied with the IOMMU group | |
59 | * at the moment of initialization. | |
60 | */ | |
61 | struct tce_container { | |
62 | struct mutex lock; | |
5ffd229c | 63 | bool enabled; |
2157e7b8 | 64 | bool v2; |
d9c72894 | 65 | bool def_window_pending; |
2d270df8 | 66 | unsigned long locked_pages; |
bc82d122 | 67 | struct mm_struct *mm; |
2157e7b8 AK |
68 | struct iommu_table *tables[IOMMU_TABLE_GROUP_MAX_TABLES]; |
69 | struct list_head group_list; | |
4b6fad70 | 70 | struct list_head prereg_list; |
5ffd229c AK |
71 | }; |
72 | ||
bc82d122 AK |
73 | static long tce_iommu_mm_set(struct tce_container *container) |
74 | { | |
75 | if (container->mm) { | |
76 | if (container->mm == current->mm) | |
77 | return 0; | |
78 | return -EPERM; | |
79 | } | |
80 | BUG_ON(!current->mm); | |
81 | container->mm = current->mm; | |
7a49de99 | 82 | mmgrab(container->mm); |
bc82d122 AK |
83 | |
84 | return 0; | |
85 | } | |
86 | ||
4b6fad70 AK |
87 | static long tce_iommu_prereg_free(struct tce_container *container, |
88 | struct tce_iommu_prereg *tcemem) | |
89 | { | |
90 | long ret; | |
91 | ||
92 | ret = mm_iommu_put(container->mm, tcemem->mem); | |
93 | if (ret) | |
94 | return ret; | |
95 | ||
96 | list_del(&tcemem->next); | |
97 | kfree(tcemem); | |
98 | ||
99 | return 0; | |
100 | } | |
101 | ||
2157e7b8 AK |
102 | static long tce_iommu_unregister_pages(struct tce_container *container, |
103 | __u64 vaddr, __u64 size) | |
104 | { | |
105 | struct mm_iommu_table_group_mem_t *mem; | |
4b6fad70 AK |
106 | struct tce_iommu_prereg *tcemem; |
107 | bool found = false; | |
e0bf78b0 | 108 | long ret; |
2157e7b8 AK |
109 | |
110 | if ((vaddr & ~PAGE_MASK) || (size & ~PAGE_MASK)) | |
111 | return -EINVAL; | |
112 | ||
e0bf78b0 | 113 | mem = mm_iommu_get(container->mm, vaddr, size >> PAGE_SHIFT); |
2157e7b8 AK |
114 | if (!mem) |
115 | return -ENOENT; | |
116 | ||
4b6fad70 AK |
117 | list_for_each_entry(tcemem, &container->prereg_list, next) { |
118 | if (tcemem->mem == mem) { | |
119 | found = true; | |
120 | break; | |
121 | } | |
122 | } | |
123 | ||
124 | if (!found) | |
e0bf78b0 AK |
125 | ret = -ENOENT; |
126 | else | |
127 | ret = tce_iommu_prereg_free(container, tcemem); | |
4b6fad70 | 128 | |
e0bf78b0 AK |
129 | mm_iommu_put(container->mm, mem); |
130 | ||
131 | return ret; | |
2157e7b8 AK |
132 | } |
133 | ||
134 | static long tce_iommu_register_pages(struct tce_container *container, | |
135 | __u64 vaddr, __u64 size) | |
136 | { | |
137 | long ret = 0; | |
138 | struct mm_iommu_table_group_mem_t *mem = NULL; | |
4b6fad70 | 139 | struct tce_iommu_prereg *tcemem; |
2157e7b8 AK |
140 | unsigned long entries = size >> PAGE_SHIFT; |
141 | ||
142 | if ((vaddr & ~PAGE_MASK) || (size & ~PAGE_MASK) || | |
143 | ((vaddr + size) < vaddr)) | |
144 | return -EINVAL; | |
145 | ||
e0bf78b0 | 146 | mem = mm_iommu_get(container->mm, vaddr, entries); |
4b6fad70 AK |
147 | if (mem) { |
148 | list_for_each_entry(tcemem, &container->prereg_list, next) { | |
e0bf78b0 AK |
149 | if (tcemem->mem == mem) { |
150 | ret = -EBUSY; | |
151 | goto put_exit; | |
152 | } | |
4b6fad70 | 153 | } |
e0bf78b0 AK |
154 | } else { |
155 | ret = mm_iommu_new(container->mm, vaddr, entries, &mem); | |
156 | if (ret) | |
157 | return ret; | |
4b6fad70 AK |
158 | } |
159 | ||
4b6fad70 | 160 | tcemem = kzalloc(sizeof(*tcemem), GFP_KERNEL); |
3393af24 | 161 | if (!tcemem) { |
e0bf78b0 AK |
162 | ret = -ENOMEM; |
163 | goto put_exit; | |
3393af24 AK |
164 | } |
165 | ||
4b6fad70 AK |
166 | tcemem->mem = mem; |
167 | list_add(&tcemem->next, &container->prereg_list); | |
168 | ||
2157e7b8 AK |
169 | container->enabled = true; |
170 | ||
171 | return 0; | |
e0bf78b0 AK |
172 | |
173 | put_exit: | |
174 | mm_iommu_put(container->mm, mem); | |
175 | return ret; | |
2157e7b8 AK |
176 | } |
177 | ||
c10c21ef | 178 | static bool tce_page_is_contained(struct mm_struct *mm, unsigned long hpa, |
94ad9338 | 179 | unsigned int it_page_shift) |
e432bc7e | 180 | { |
c10c21ef AK |
181 | struct page *page; |
182 | unsigned long size = 0; | |
183 | ||
94ad9338 MWO |
184 | if (mm_iommu_is_devmem(mm, hpa, it_page_shift, &size)) |
185 | return size == (1UL << it_page_shift); | |
c10c21ef AK |
186 | |
187 | page = pfn_to_page(hpa >> PAGE_SHIFT); | |
e432bc7e AK |
188 | /* |
189 | * Check that the TCE table granularity is not bigger than the size of | |
190 | * a page we just found. Otherwise the hardware can get access to | |
191 | * a bigger memory chunk that it should. | |
192 | */ | |
94ad9338 | 193 | return page_shift(compound_head(page)) >= it_page_shift; |
e432bc7e AK |
194 | } |
195 | ||
2157e7b8 AK |
196 | static inline bool tce_groups_attached(struct tce_container *container) |
197 | { | |
198 | return !list_empty(&container->group_list); | |
199 | } | |
200 | ||
0eaf4def AK |
201 | static long tce_iommu_find_table(struct tce_container *container, |
202 | phys_addr_t ioba, struct iommu_table **ptbl) | |
203 | { | |
204 | long i; | |
0eaf4def AK |
205 | |
206 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { | |
2157e7b8 | 207 | struct iommu_table *tbl = container->tables[i]; |
0eaf4def AK |
208 | |
209 | if (tbl) { | |
210 | unsigned long entry = ioba >> tbl->it_page_shift; | |
211 | unsigned long start = tbl->it_offset; | |
212 | unsigned long end = start + tbl->it_size; | |
213 | ||
214 | if ((start <= entry) && (entry < end)) { | |
215 | *ptbl = tbl; | |
216 | return i; | |
217 | } | |
218 | } | |
219 | } | |
220 | ||
221 | return -1; | |
222 | } | |
223 | ||
e633bc86 AK |
224 | static int tce_iommu_find_free_table(struct tce_container *container) |
225 | { | |
226 | int i; | |
227 | ||
228 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { | |
229 | if (!container->tables[i]) | |
230 | return i; | |
231 | } | |
232 | ||
233 | return -ENOSPC; | |
234 | } | |
235 | ||
5ffd229c AK |
236 | static int tce_iommu_enable(struct tce_container *container) |
237 | { | |
238 | int ret = 0; | |
2d270df8 | 239 | unsigned long locked; |
0eaf4def | 240 | struct iommu_table_group *table_group; |
2157e7b8 | 241 | struct tce_iommu_group *tcegrp; |
5ffd229c | 242 | |
5ffd229c AK |
243 | if (container->enabled) |
244 | return -EBUSY; | |
245 | ||
246 | /* | |
247 | * When userspace pages are mapped into the IOMMU, they are effectively | |
248 | * locked memory, so, theoretically, we need to update the accounting | |
249 | * of locked pages on each map and unmap. For powerpc, the map unmap | |
250 | * paths can be very hot, though, and the accounting would kill | |
251 | * performance, especially since it would be difficult to impossible | |
252 | * to handle the accounting in real mode only. | |
253 | * | |
254 | * To address that, rather than precisely accounting every page, we | |
255 | * instead account for a worst case on locked memory when the iommu is | |
256 | * enabled and disabled. The worst case upper bound on locked memory | |
257 | * is the size of the whole iommu window, which is usually relatively | |
258 | * small (compared to total memory sizes) on POWER hardware. | |
259 | * | |
260 | * Also we don't have a nice way to fail on H_PUT_TCE due to ulimits, | |
261 | * that would effectively kill the guest at random points, much better | |
262 | * enforcing the limit based on the max that the guest can map. | |
2d270df8 AK |
263 | * |
264 | * Unfortunately at the moment it counts whole tables, no matter how | |
265 | * much memory the guest has. I.e. for 4GB guest and 4 IOMMU groups | |
266 | * each with 2GB DMA window, 8GB will be counted here. The reason for | |
267 | * this is that we cannot tell here the amount of RAM used by the guest | |
268 | * as this information is only available from KVM and VFIO is | |
269 | * KVM agnostic. | |
4793d65d AK |
270 | * |
271 | * So we do not allow enabling a container without a group attached | |
272 | * as there is no way to know how much we should increment | |
273 | * the locked_vm counter. | |
5ffd229c | 274 | */ |
2157e7b8 AK |
275 | if (!tce_groups_attached(container)) |
276 | return -ENODEV; | |
277 | ||
278 | tcegrp = list_first_entry(&container->group_list, | |
279 | struct tce_iommu_group, next); | |
280 | table_group = iommu_group_get_iommudata(tcegrp->grp); | |
0eaf4def AK |
281 | if (!table_group) |
282 | return -ENODEV; | |
283 | ||
4793d65d AK |
284 | if (!table_group->tce32_size) |
285 | return -EPERM; | |
286 | ||
bc82d122 AK |
287 | ret = tce_iommu_mm_set(container); |
288 | if (ret) | |
289 | return ret; | |
290 | ||
4793d65d | 291 | locked = table_group->tce32_size >> PAGE_SHIFT; |
79eb597c | 292 | ret = account_locked_vm(container->mm, locked, true); |
2d270df8 AK |
293 | if (ret) |
294 | return ret; | |
5ffd229c | 295 | |
2d270df8 AK |
296 | container->locked_pages = locked; |
297 | ||
298 | container->enabled = true; | |
5ffd229c AK |
299 | |
300 | return ret; | |
301 | } | |
302 | ||
303 | static void tce_iommu_disable(struct tce_container *container) | |
304 | { | |
305 | if (!container->enabled) | |
306 | return; | |
307 | ||
308 | container->enabled = false; | |
309 | ||
bc82d122 | 310 | BUG_ON(!container->mm); |
79eb597c | 311 | account_locked_vm(container->mm, container->locked_pages, false); |
5ffd229c AK |
312 | } |
313 | ||
314 | static void *tce_iommu_open(unsigned long arg) | |
315 | { | |
316 | struct tce_container *container; | |
317 | ||
2157e7b8 | 318 | if ((arg != VFIO_SPAPR_TCE_IOMMU) && (arg != VFIO_SPAPR_TCE_v2_IOMMU)) { |
5ffd229c AK |
319 | pr_err("tce_vfio: Wrong IOMMU type\n"); |
320 | return ERR_PTR(-EINVAL); | |
321 | } | |
322 | ||
323 | container = kzalloc(sizeof(*container), GFP_KERNEL); | |
324 | if (!container) | |
325 | return ERR_PTR(-ENOMEM); | |
326 | ||
327 | mutex_init(&container->lock); | |
2157e7b8 | 328 | INIT_LIST_HEAD_RCU(&container->group_list); |
4b6fad70 | 329 | INIT_LIST_HEAD_RCU(&container->prereg_list); |
2157e7b8 AK |
330 | |
331 | container->v2 = arg == VFIO_SPAPR_TCE_v2_IOMMU; | |
5ffd229c AK |
332 | |
333 | return container; | |
334 | } | |
335 | ||
2157e7b8 AK |
336 | static int tce_iommu_clear(struct tce_container *container, |
337 | struct iommu_table *tbl, | |
338 | unsigned long entry, unsigned long pages); | |
bc82d122 AK |
339 | static void tce_iommu_free_table(struct tce_container *container, |
340 | struct iommu_table *tbl); | |
2157e7b8 | 341 | |
5ffd229c AK |
342 | static void tce_iommu_release(void *iommu_data) |
343 | { | |
344 | struct tce_container *container = iommu_data; | |
2157e7b8 | 345 | struct tce_iommu_group *tcegrp; |
517ad4ae | 346 | struct tce_iommu_prereg *tcemem, *tmtmp; |
2157e7b8 | 347 | long i; |
5ffd229c | 348 | |
2157e7b8 AK |
349 | while (tce_groups_attached(container)) { |
350 | tcegrp = list_first_entry(&container->group_list, | |
351 | struct tce_iommu_group, next); | |
2157e7b8 AK |
352 | tce_iommu_detach_group(iommu_data, tcegrp->grp); |
353 | } | |
5ffd229c | 354 | |
2157e7b8 AK |
355 | /* |
356 | * If VFIO created a table, it was not disposed | |
357 | * by tce_iommu_detach_group() so do it now. | |
358 | */ | |
359 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { | |
360 | struct iommu_table *tbl = container->tables[i]; | |
361 | ||
362 | if (!tbl) | |
363 | continue; | |
364 | ||
365 | tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size); | |
bc82d122 | 366 | tce_iommu_free_table(container, tbl); |
2157e7b8 | 367 | } |
5ffd229c | 368 | |
517ad4ae AK |
369 | list_for_each_entry_safe(tcemem, tmtmp, &container->prereg_list, next) |
370 | WARN_ON(tce_iommu_prereg_free(container, tcemem)); | |
4b6fad70 | 371 | |
649354b7 | 372 | tce_iommu_disable(container); |
bc82d122 AK |
373 | if (container->mm) |
374 | mmdrop(container->mm); | |
5ffd229c AK |
375 | mutex_destroy(&container->lock); |
376 | ||
377 | kfree(container); | |
378 | } | |
379 | ||
649354b7 | 380 | static void tce_iommu_unuse_page(struct tce_container *container, |
05c6cfb9 | 381 | unsigned long hpa) |
649354b7 AK |
382 | { |
383 | struct page *page; | |
384 | ||
05c6cfb9 | 385 | page = pfn_to_page(hpa >> PAGE_SHIFT); |
649354b7 AK |
386 | put_page(page); |
387 | } | |
388 | ||
bc82d122 | 389 | static int tce_iommu_prereg_ua_to_hpa(struct tce_container *container, |
1463edca | 390 | unsigned long tce, unsigned long shift, |
2157e7b8 AK |
391 | unsigned long *phpa, struct mm_iommu_table_group_mem_t **pmem) |
392 | { | |
393 | long ret = 0; | |
394 | struct mm_iommu_table_group_mem_t *mem; | |
395 | ||
1463edca | 396 | mem = mm_iommu_lookup(container->mm, tce, 1ULL << shift); |
2157e7b8 AK |
397 | if (!mem) |
398 | return -EINVAL; | |
399 | ||
76fa4975 | 400 | ret = mm_iommu_ua_to_hpa(mem, tce, shift, phpa); |
2157e7b8 AK |
401 | if (ret) |
402 | return -EINVAL; | |
403 | ||
404 | *pmem = mem; | |
405 | ||
406 | return 0; | |
407 | } | |
408 | ||
bc82d122 AK |
409 | static void tce_iommu_unuse_page_v2(struct tce_container *container, |
410 | struct iommu_table *tbl, unsigned long entry) | |
2157e7b8 AK |
411 | { |
412 | struct mm_iommu_table_group_mem_t *mem = NULL; | |
413 | int ret; | |
414 | unsigned long hpa = 0; | |
6e301a8e | 415 | __be64 *pua = IOMMU_TABLE_USERSPACE_ENTRY_RO(tbl, entry); |
2157e7b8 | 416 | |
bc82d122 | 417 | if (!pua) |
2157e7b8 AK |
418 | return; |
419 | ||
00a5c58d | 420 | ret = tce_iommu_prereg_ua_to_hpa(container, be64_to_cpu(*pua), |
b3124ec2 | 421 | tbl->it_page_shift, &hpa, &mem); |
2157e7b8 | 422 | if (ret) |
00a5c58d AK |
423 | pr_debug("%s: tce %llx at #%lx was not cached, ret=%d\n", |
424 | __func__, be64_to_cpu(*pua), entry, ret); | |
2157e7b8 AK |
425 | if (mem) |
426 | mm_iommu_mapped_dec(mem); | |
427 | ||
00a5c58d | 428 | *pua = cpu_to_be64(0); |
2157e7b8 AK |
429 | } |
430 | ||
9b14a1ff AK |
431 | static int tce_iommu_clear(struct tce_container *container, |
432 | struct iommu_table *tbl, | |
433 | unsigned long entry, unsigned long pages) | |
434 | { | |
05c6cfb9 AK |
435 | unsigned long oldhpa; |
436 | long ret; | |
437 | enum dma_data_direction direction; | |
650ab1e3 | 438 | unsigned long lastentry = entry + pages, firstentry = entry; |
6e301a8e AK |
439 | |
440 | for ( ; entry < lastentry; ++entry) { | |
441 | if (tbl->it_indirect_levels && tbl->it_userspace) { | |
442 | /* | |
443 | * For multilevel tables, we can take a shortcut here | |
444 | * and skip some TCEs as we know that the userspace | |
445 | * addresses cache is a mirror of the real TCE table | |
446 | * and if it is missing some indirect levels, then | |
447 | * the hardware table does not have them allocated | |
448 | * either and therefore does not require updating. | |
449 | */ | |
450 | __be64 *pua = IOMMU_TABLE_USERSPACE_ENTRY_RO(tbl, | |
451 | entry); | |
452 | if (!pua) { | |
453 | /* align to level_size which is power of two */ | |
454 | entry |= tbl->it_level_size - 1; | |
455 | continue; | |
456 | } | |
457 | } | |
9b14a1ff | 458 | |
5c2fefd8 AK |
459 | cond_resched(); |
460 | ||
05c6cfb9 AK |
461 | direction = DMA_NONE; |
462 | oldhpa = 0; | |
650ab1e3 | 463 | ret = iommu_tce_xchg_no_kill(container->mm, tbl, entry, &oldhpa, |
c10c21ef | 464 | &direction); |
05c6cfb9 AK |
465 | if (ret) |
466 | continue; | |
467 | ||
468 | if (direction == DMA_NONE) | |
9b14a1ff AK |
469 | continue; |
470 | ||
2157e7b8 | 471 | if (container->v2) { |
bc82d122 | 472 | tce_iommu_unuse_page_v2(container, tbl, entry); |
2157e7b8 AK |
473 | continue; |
474 | } | |
475 | ||
05c6cfb9 | 476 | tce_iommu_unuse_page(container, oldhpa); |
9b14a1ff AK |
477 | } |
478 | ||
650ab1e3 AK |
479 | iommu_tce_kill(tbl, firstentry, pages); |
480 | ||
9b14a1ff AK |
481 | return 0; |
482 | } | |
483 | ||
649354b7 AK |
484 | static int tce_iommu_use_page(unsigned long tce, unsigned long *hpa) |
485 | { | |
486 | struct page *page = NULL; | |
487 | enum dma_data_direction direction = iommu_tce_direction(tce); | |
488 | ||
489 | if (get_user_pages_fast(tce & PAGE_MASK, 1, | |
73b0140b IW |
490 | direction != DMA_TO_DEVICE ? FOLL_WRITE : 0, |
491 | &page) != 1) | |
649354b7 AK |
492 | return -EFAULT; |
493 | ||
494 | *hpa = __pa((unsigned long) page_address(page)); | |
495 | ||
496 | return 0; | |
497 | } | |
498 | ||
9b14a1ff AK |
499 | static long tce_iommu_build(struct tce_container *container, |
500 | struct iommu_table *tbl, | |
05c6cfb9 AK |
501 | unsigned long entry, unsigned long tce, unsigned long pages, |
502 | enum dma_data_direction direction) | |
9b14a1ff AK |
503 | { |
504 | long i, ret = 0; | |
649354b7 | 505 | unsigned long hpa; |
05c6cfb9 | 506 | enum dma_data_direction dirtmp; |
9b14a1ff AK |
507 | |
508 | for (i = 0; i < pages; ++i) { | |
509 | unsigned long offset = tce & IOMMU_PAGE_MASK(tbl) & ~PAGE_MASK; | |
510 | ||
649354b7 AK |
511 | ret = tce_iommu_use_page(tce, &hpa); |
512 | if (ret) | |
9b14a1ff | 513 | break; |
e432bc7e | 514 | |
c10c21ef AK |
515 | if (!tce_page_is_contained(container->mm, hpa, |
516 | tbl->it_page_shift)) { | |
e432bc7e AK |
517 | ret = -EPERM; |
518 | break; | |
519 | } | |
520 | ||
649354b7 | 521 | hpa |= offset; |
05c6cfb9 | 522 | dirtmp = direction; |
650ab1e3 AK |
523 | ret = iommu_tce_xchg_no_kill(container->mm, tbl, entry + i, |
524 | &hpa, &dirtmp); | |
9b14a1ff | 525 | if (ret) { |
649354b7 | 526 | tce_iommu_unuse_page(container, hpa); |
9b14a1ff AK |
527 | pr_err("iommu_tce: %s failed ioba=%lx, tce=%lx, ret=%ld\n", |
528 | __func__, entry << tbl->it_page_shift, | |
529 | tce, ret); | |
530 | break; | |
531 | } | |
05c6cfb9 AK |
532 | |
533 | if (dirtmp != DMA_NONE) | |
534 | tce_iommu_unuse_page(container, hpa); | |
535 | ||
00663d4e | 536 | tce += IOMMU_PAGE_SIZE(tbl); |
9b14a1ff AK |
537 | } |
538 | ||
539 | if (ret) | |
540 | tce_iommu_clear(container, tbl, entry, i); | |
650ab1e3 AK |
541 | else |
542 | iommu_tce_kill(tbl, entry, pages); | |
9b14a1ff AK |
543 | |
544 | return ret; | |
545 | } | |
546 | ||
2157e7b8 AK |
547 | static long tce_iommu_build_v2(struct tce_container *container, |
548 | struct iommu_table *tbl, | |
549 | unsigned long entry, unsigned long tce, unsigned long pages, | |
550 | enum dma_data_direction direction) | |
551 | { | |
552 | long i, ret = 0; | |
2157e7b8 AK |
553 | unsigned long hpa; |
554 | enum dma_data_direction dirtmp; | |
555 | ||
556 | for (i = 0; i < pages; ++i) { | |
557 | struct mm_iommu_table_group_mem_t *mem = NULL; | |
00a5c58d | 558 | __be64 *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl, entry + i); |
2157e7b8 | 559 | |
bc82d122 | 560 | ret = tce_iommu_prereg_ua_to_hpa(container, |
1463edca | 561 | tce, tbl->it_page_shift, &hpa, &mem); |
2157e7b8 AK |
562 | if (ret) |
563 | break; | |
564 | ||
c10c21ef AK |
565 | if (!tce_page_is_contained(container->mm, hpa, |
566 | tbl->it_page_shift)) { | |
2157e7b8 AK |
567 | ret = -EPERM; |
568 | break; | |
569 | } | |
570 | ||
571 | /* Preserve offset within IOMMU page */ | |
572 | hpa |= tce & IOMMU_PAGE_MASK(tbl) & ~PAGE_MASK; | |
573 | dirtmp = direction; | |
574 | ||
575 | /* The registered region is being unregistered */ | |
576 | if (mm_iommu_mapped_inc(mem)) | |
577 | break; | |
578 | ||
650ab1e3 AK |
579 | ret = iommu_tce_xchg_no_kill(container->mm, tbl, entry + i, |
580 | &hpa, &dirtmp); | |
2157e7b8 AK |
581 | if (ret) { |
582 | /* dirtmp cannot be DMA_NONE here */ | |
bc82d122 | 583 | tce_iommu_unuse_page_v2(container, tbl, entry + i); |
2157e7b8 AK |
584 | pr_err("iommu_tce: %s failed ioba=%lx, tce=%lx, ret=%ld\n", |
585 | __func__, entry << tbl->it_page_shift, | |
586 | tce, ret); | |
587 | break; | |
588 | } | |
589 | ||
590 | if (dirtmp != DMA_NONE) | |
bc82d122 | 591 | tce_iommu_unuse_page_v2(container, tbl, entry + i); |
2157e7b8 | 592 | |
00a5c58d | 593 | *pua = cpu_to_be64(tce); |
2157e7b8 AK |
594 | |
595 | tce += IOMMU_PAGE_SIZE(tbl); | |
596 | } | |
597 | ||
598 | if (ret) | |
599 | tce_iommu_clear(container, tbl, entry, i); | |
650ab1e3 AK |
600 | else |
601 | iommu_tce_kill(tbl, entry, pages); | |
2157e7b8 AK |
602 | |
603 | return ret; | |
604 | } | |
605 | ||
46d3e1e1 AK |
606 | static long tce_iommu_create_table(struct tce_container *container, |
607 | struct iommu_table_group *table_group, | |
608 | int num, | |
609 | __u32 page_shift, | |
610 | __u64 window_size, | |
611 | __u32 levels, | |
612 | struct iommu_table **ptbl) | |
613 | { | |
614 | long ret, table_size; | |
615 | ||
616 | table_size = table_group->ops->get_table_size(page_shift, window_size, | |
617 | levels); | |
618 | if (!table_size) | |
619 | return -EINVAL; | |
620 | ||
79eb597c | 621 | ret = account_locked_vm(container->mm, table_size >> PAGE_SHIFT, true); |
46d3e1e1 AK |
622 | if (ret) |
623 | return ret; | |
624 | ||
625 | ret = table_group->ops->create_table(table_group, num, | |
626 | page_shift, window_size, levels, ptbl); | |
627 | ||
628 | WARN_ON(!ret && !(*ptbl)->it_ops->free); | |
a68bd126 | 629 | WARN_ON(!ret && ((*ptbl)->it_allocated_size > table_size)); |
46d3e1e1 | 630 | |
46d3e1e1 AK |
631 | return ret; |
632 | } | |
633 | ||
bc82d122 AK |
634 | static void tce_iommu_free_table(struct tce_container *container, |
635 | struct iommu_table *tbl) | |
46d3e1e1 AK |
636 | { |
637 | unsigned long pages = tbl->it_allocated_size >> PAGE_SHIFT; | |
638 | ||
e5afdf9d | 639 | iommu_tce_table_put(tbl); |
79eb597c | 640 | account_locked_vm(container->mm, pages, false); |
46d3e1e1 AK |
641 | } |
642 | ||
e633bc86 AK |
643 | static long tce_iommu_create_window(struct tce_container *container, |
644 | __u32 page_shift, __u64 window_size, __u32 levels, | |
645 | __u64 *start_addr) | |
646 | { | |
647 | struct tce_iommu_group *tcegrp; | |
648 | struct iommu_table_group *table_group; | |
649 | struct iommu_table *tbl = NULL; | |
650 | long ret, num; | |
651 | ||
652 | num = tce_iommu_find_free_table(container); | |
653 | if (num < 0) | |
654 | return num; | |
655 | ||
656 | /* Get the first group for ops::create_table */ | |
657 | tcegrp = list_first_entry(&container->group_list, | |
658 | struct tce_iommu_group, next); | |
659 | table_group = iommu_group_get_iommudata(tcegrp->grp); | |
660 | if (!table_group) | |
661 | return -EFAULT; | |
662 | ||
663 | if (!(table_group->pgsizes & (1ULL << page_shift))) | |
664 | return -EINVAL; | |
665 | ||
666 | if (!table_group->ops->set_window || !table_group->ops->unset_window || | |
667 | !table_group->ops->get_table_size || | |
668 | !table_group->ops->create_table) | |
669 | return -EPERM; | |
670 | ||
671 | /* Create TCE table */ | |
672 | ret = tce_iommu_create_table(container, table_group, num, | |
673 | page_shift, window_size, levels, &tbl); | |
674 | if (ret) | |
675 | return ret; | |
676 | ||
677 | BUG_ON(!tbl->it_ops->free); | |
678 | ||
679 | /* | |
680 | * Program the table to every group. | |
681 | * Groups have been tested for compatibility at the attach time. | |
682 | */ | |
683 | list_for_each_entry(tcegrp, &container->group_list, next) { | |
684 | table_group = iommu_group_get_iommudata(tcegrp->grp); | |
685 | ||
686 | ret = table_group->ops->set_window(table_group, num, tbl); | |
687 | if (ret) | |
688 | goto unset_exit; | |
689 | } | |
690 | ||
691 | container->tables[num] = tbl; | |
692 | ||
693 | /* Return start address assigned by platform in create_table() */ | |
694 | *start_addr = tbl->it_offset << tbl->it_page_shift; | |
695 | ||
696 | return 0; | |
697 | ||
698 | unset_exit: | |
699 | list_for_each_entry(tcegrp, &container->group_list, next) { | |
700 | table_group = iommu_group_get_iommudata(tcegrp->grp); | |
701 | table_group->ops->unset_window(table_group, num); | |
702 | } | |
bc82d122 | 703 | tce_iommu_free_table(container, tbl); |
e633bc86 AK |
704 | |
705 | return ret; | |
706 | } | |
707 | ||
708 | static long tce_iommu_remove_window(struct tce_container *container, | |
709 | __u64 start_addr) | |
710 | { | |
711 | struct iommu_table_group *table_group = NULL; | |
712 | struct iommu_table *tbl; | |
713 | struct tce_iommu_group *tcegrp; | |
714 | int num; | |
715 | ||
716 | num = tce_iommu_find_table(container, start_addr, &tbl); | |
717 | if (num < 0) | |
718 | return -EINVAL; | |
719 | ||
720 | BUG_ON(!tbl->it_size); | |
721 | ||
722 | /* Detach groups from IOMMUs */ | |
723 | list_for_each_entry(tcegrp, &container->group_list, next) { | |
724 | table_group = iommu_group_get_iommudata(tcegrp->grp); | |
725 | ||
726 | /* | |
727 | * SPAPR TCE IOMMU exposes the default DMA window to | |
728 | * the guest via dma32_window_start/size of | |
729 | * VFIO_IOMMU_SPAPR_TCE_GET_INFO. Some platforms allow | |
730 | * the userspace to remove this window, some do not so | |
731 | * here we check for the platform capability. | |
732 | */ | |
733 | if (!table_group->ops || !table_group->ops->unset_window) | |
734 | return -EPERM; | |
735 | ||
736 | table_group->ops->unset_window(table_group, num); | |
737 | } | |
738 | ||
739 | /* Free table */ | |
740 | tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size); | |
bc82d122 | 741 | tce_iommu_free_table(container, tbl); |
e633bc86 AK |
742 | container->tables[num] = NULL; |
743 | ||
744 | return 0; | |
745 | } | |
746 | ||
6f01cc69 AK |
747 | static long tce_iommu_create_default_window(struct tce_container *container) |
748 | { | |
749 | long ret; | |
750 | __u64 start_addr = 0; | |
751 | struct tce_iommu_group *tcegrp; | |
752 | struct iommu_table_group *table_group; | |
753 | ||
d9c72894 AK |
754 | if (!container->def_window_pending) |
755 | return 0; | |
756 | ||
6f01cc69 AK |
757 | if (!tce_groups_attached(container)) |
758 | return -ENODEV; | |
759 | ||
760 | tcegrp = list_first_entry(&container->group_list, | |
761 | struct tce_iommu_group, next); | |
762 | table_group = iommu_group_get_iommudata(tcegrp->grp); | |
763 | if (!table_group) | |
764 | return -ENODEV; | |
765 | ||
766 | ret = tce_iommu_create_window(container, IOMMU_PAGE_SHIFT_4K, | |
767 | table_group->tce32_size, 1, &start_addr); | |
768 | WARN_ON_ONCE(!ret && start_addr); | |
769 | ||
d9c72894 AK |
770 | if (!ret) |
771 | container->def_window_pending = false; | |
772 | ||
6f01cc69 AK |
773 | return ret; |
774 | } | |
775 | ||
5ffd229c AK |
776 | static long tce_iommu_ioctl(void *iommu_data, |
777 | unsigned int cmd, unsigned long arg) | |
778 | { | |
779 | struct tce_container *container = iommu_data; | |
e633bc86 | 780 | unsigned long minsz, ddwsz; |
5ffd229c AK |
781 | long ret; |
782 | ||
783 | switch (cmd) { | |
784 | case VFIO_CHECK_EXTENSION: | |
1b69be5e GS |
785 | switch (arg) { |
786 | case VFIO_SPAPR_TCE_IOMMU: | |
2157e7b8 | 787 | case VFIO_SPAPR_TCE_v2_IOMMU: |
1b69be5e GS |
788 | ret = 1; |
789 | break; | |
790 | default: | |
791 | ret = vfio_spapr_iommu_eeh_ioctl(NULL, cmd, arg); | |
792 | break; | |
793 | } | |
794 | ||
795 | return (ret < 0) ? 0 : ret; | |
bc82d122 AK |
796 | } |
797 | ||
798 | /* | |
799 | * Sanity check to prevent one userspace from manipulating | |
800 | * another userspace mm. | |
801 | */ | |
802 | BUG_ON(!container); | |
803 | if (container->mm && container->mm != current->mm) | |
804 | return -EPERM; | |
5ffd229c | 805 | |
bc82d122 | 806 | switch (cmd) { |
5ffd229c AK |
807 | case VFIO_IOMMU_SPAPR_TCE_GET_INFO: { |
808 | struct vfio_iommu_spapr_tce_info info; | |
2157e7b8 | 809 | struct tce_iommu_group *tcegrp; |
0eaf4def AK |
810 | struct iommu_table_group *table_group; |
811 | ||
2157e7b8 | 812 | if (!tce_groups_attached(container)) |
0eaf4def AK |
813 | return -ENXIO; |
814 | ||
2157e7b8 AK |
815 | tcegrp = list_first_entry(&container->group_list, |
816 | struct tce_iommu_group, next); | |
817 | table_group = iommu_group_get_iommudata(tcegrp->grp); | |
5ffd229c | 818 | |
4793d65d | 819 | if (!table_group) |
5ffd229c AK |
820 | return -ENXIO; |
821 | ||
822 | minsz = offsetofend(struct vfio_iommu_spapr_tce_info, | |
823 | dma32_window_size); | |
824 | ||
825 | if (copy_from_user(&info, (void __user *)arg, minsz)) | |
826 | return -EFAULT; | |
827 | ||
828 | if (info.argsz < minsz) | |
829 | return -EINVAL; | |
830 | ||
4793d65d AK |
831 | info.dma32_window_start = table_group->tce32_start; |
832 | info.dma32_window_size = table_group->tce32_size; | |
5ffd229c | 833 | info.flags = 0; |
e633bc86 AK |
834 | memset(&info.ddw, 0, sizeof(info.ddw)); |
835 | ||
836 | if (table_group->max_dynamic_windows_supported && | |
837 | container->v2) { | |
838 | info.flags |= VFIO_IOMMU_SPAPR_INFO_DDW; | |
839 | info.ddw.pgsizes = table_group->pgsizes; | |
840 | info.ddw.max_dynamic_windows_supported = | |
841 | table_group->max_dynamic_windows_supported; | |
842 | info.ddw.levels = table_group->max_levels; | |
843 | } | |
844 | ||
845 | ddwsz = offsetofend(struct vfio_iommu_spapr_tce_info, ddw); | |
846 | ||
847 | if (info.argsz >= ddwsz) | |
848 | minsz = ddwsz; | |
5ffd229c AK |
849 | |
850 | if (copy_to_user((void __user *)arg, &info, minsz)) | |
851 | return -EFAULT; | |
852 | ||
853 | return 0; | |
854 | } | |
855 | case VFIO_IOMMU_MAP_DMA: { | |
856 | struct vfio_iommu_type1_dma_map param; | |
0eaf4def | 857 | struct iommu_table *tbl = NULL; |
0eaf4def | 858 | long num; |
05c6cfb9 | 859 | enum dma_data_direction direction; |
5ffd229c | 860 | |
3c56e822 AK |
861 | if (!container->enabled) |
862 | return -EPERM; | |
863 | ||
5ffd229c AK |
864 | minsz = offsetofend(struct vfio_iommu_type1_dma_map, size); |
865 | ||
866 | if (copy_from_user(¶m, (void __user *)arg, minsz)) | |
867 | return -EFAULT; | |
868 | ||
869 | if (param.argsz < minsz) | |
870 | return -EINVAL; | |
871 | ||
872 | if (param.flags & ~(VFIO_DMA_MAP_FLAG_READ | | |
873 | VFIO_DMA_MAP_FLAG_WRITE)) | |
874 | return -EINVAL; | |
875 | ||
d9c72894 AK |
876 | ret = tce_iommu_create_default_window(container); |
877 | if (ret) | |
878 | return ret; | |
879 | ||
0eaf4def AK |
880 | num = tce_iommu_find_table(container, param.iova, &tbl); |
881 | if (num < 0) | |
882 | return -ENXIO; | |
883 | ||
00663d4e AK |
884 | if ((param.size & ~IOMMU_PAGE_MASK(tbl)) || |
885 | (param.vaddr & ~IOMMU_PAGE_MASK(tbl))) | |
5ffd229c AK |
886 | return -EINVAL; |
887 | ||
888 | /* iova is checked by the IOMMU API */ | |
05c6cfb9 AK |
889 | if (param.flags & VFIO_DMA_MAP_FLAG_READ) { |
890 | if (param.flags & VFIO_DMA_MAP_FLAG_WRITE) | |
891 | direction = DMA_BIDIRECTIONAL; | |
892 | else | |
893 | direction = DMA_TO_DEVICE; | |
894 | } else { | |
895 | if (param.flags & VFIO_DMA_MAP_FLAG_WRITE) | |
896 | direction = DMA_FROM_DEVICE; | |
897 | else | |
898 | return -EINVAL; | |
899 | } | |
5ffd229c | 900 | |
05c6cfb9 | 901 | ret = iommu_tce_put_param_check(tbl, param.iova, param.vaddr); |
5ffd229c AK |
902 | if (ret) |
903 | return ret; | |
904 | ||
2157e7b8 AK |
905 | if (container->v2) |
906 | ret = tce_iommu_build_v2(container, tbl, | |
907 | param.iova >> tbl->it_page_shift, | |
908 | param.vaddr, | |
909 | param.size >> tbl->it_page_shift, | |
910 | direction); | |
911 | else | |
912 | ret = tce_iommu_build(container, tbl, | |
913 | param.iova >> tbl->it_page_shift, | |
914 | param.vaddr, | |
915 | param.size >> tbl->it_page_shift, | |
916 | direction); | |
5ffd229c AK |
917 | |
918 | iommu_flush_tce(tbl); | |
919 | ||
920 | return ret; | |
921 | } | |
922 | case VFIO_IOMMU_UNMAP_DMA: { | |
923 | struct vfio_iommu_type1_dma_unmap param; | |
0eaf4def AK |
924 | struct iommu_table *tbl = NULL; |
925 | long num; | |
5ffd229c | 926 | |
3c56e822 AK |
927 | if (!container->enabled) |
928 | return -EPERM; | |
929 | ||
5ffd229c AK |
930 | minsz = offsetofend(struct vfio_iommu_type1_dma_unmap, |
931 | size); | |
932 | ||
933 | if (copy_from_user(¶m, (void __user *)arg, minsz)) | |
934 | return -EFAULT; | |
935 | ||
936 | if (param.argsz < minsz) | |
937 | return -EINVAL; | |
938 | ||
939 | /* No flag is supported now */ | |
940 | if (param.flags) | |
941 | return -EINVAL; | |
942 | ||
d9c72894 AK |
943 | ret = tce_iommu_create_default_window(container); |
944 | if (ret) | |
945 | return ret; | |
946 | ||
0eaf4def AK |
947 | num = tce_iommu_find_table(container, param.iova, &tbl); |
948 | if (num < 0) | |
949 | return -ENXIO; | |
950 | ||
00663d4e | 951 | if (param.size & ~IOMMU_PAGE_MASK(tbl)) |
5ffd229c AK |
952 | return -EINVAL; |
953 | ||
954 | ret = iommu_tce_clear_param_check(tbl, param.iova, 0, | |
00663d4e | 955 | param.size >> tbl->it_page_shift); |
5ffd229c AK |
956 | if (ret) |
957 | return ret; | |
958 | ||
9b14a1ff | 959 | ret = tce_iommu_clear(container, tbl, |
00663d4e AK |
960 | param.iova >> tbl->it_page_shift, |
961 | param.size >> tbl->it_page_shift); | |
5ffd229c AK |
962 | iommu_flush_tce(tbl); |
963 | ||
964 | return ret; | |
965 | } | |
2157e7b8 AK |
966 | case VFIO_IOMMU_SPAPR_REGISTER_MEMORY: { |
967 | struct vfio_iommu_spapr_register_memory param; | |
968 | ||
969 | if (!container->v2) | |
970 | break; | |
971 | ||
972 | minsz = offsetofend(struct vfio_iommu_spapr_register_memory, | |
973 | size); | |
974 | ||
bc82d122 AK |
975 | ret = tce_iommu_mm_set(container); |
976 | if (ret) | |
977 | return ret; | |
978 | ||
2157e7b8 AK |
979 | if (copy_from_user(¶m, (void __user *)arg, minsz)) |
980 | return -EFAULT; | |
981 | ||
982 | if (param.argsz < minsz) | |
983 | return -EINVAL; | |
984 | ||
985 | /* No flag is supported now */ | |
986 | if (param.flags) | |
987 | return -EINVAL; | |
988 | ||
989 | mutex_lock(&container->lock); | |
990 | ret = tce_iommu_register_pages(container, param.vaddr, | |
991 | param.size); | |
992 | mutex_unlock(&container->lock); | |
993 | ||
994 | return ret; | |
995 | } | |
996 | case VFIO_IOMMU_SPAPR_UNREGISTER_MEMORY: { | |
997 | struct vfio_iommu_spapr_register_memory param; | |
998 | ||
999 | if (!container->v2) | |
1000 | break; | |
1001 | ||
bc82d122 AK |
1002 | if (!container->mm) |
1003 | return -EPERM; | |
1004 | ||
2157e7b8 AK |
1005 | minsz = offsetofend(struct vfio_iommu_spapr_register_memory, |
1006 | size); | |
1007 | ||
1008 | if (copy_from_user(¶m, (void __user *)arg, minsz)) | |
1009 | return -EFAULT; | |
1010 | ||
1011 | if (param.argsz < minsz) | |
1012 | return -EINVAL; | |
1013 | ||
1014 | /* No flag is supported now */ | |
1015 | if (param.flags) | |
1016 | return -EINVAL; | |
1017 | ||
1018 | mutex_lock(&container->lock); | |
1019 | ret = tce_iommu_unregister_pages(container, param.vaddr, | |
1020 | param.size); | |
1021 | mutex_unlock(&container->lock); | |
1022 | ||
1023 | return ret; | |
1024 | } | |
5ffd229c | 1025 | case VFIO_IOMMU_ENABLE: |
2157e7b8 AK |
1026 | if (container->v2) |
1027 | break; | |
1028 | ||
5ffd229c AK |
1029 | mutex_lock(&container->lock); |
1030 | ret = tce_iommu_enable(container); | |
1031 | mutex_unlock(&container->lock); | |
1032 | return ret; | |
1033 | ||
1034 | ||
1035 | case VFIO_IOMMU_DISABLE: | |
2157e7b8 AK |
1036 | if (container->v2) |
1037 | break; | |
1038 | ||
5ffd229c AK |
1039 | mutex_lock(&container->lock); |
1040 | tce_iommu_disable(container); | |
1041 | mutex_unlock(&container->lock); | |
1042 | return 0; | |
1b69be5e | 1043 | |
2157e7b8 AK |
1044 | case VFIO_EEH_PE_OP: { |
1045 | struct tce_iommu_group *tcegrp; | |
1046 | ||
1047 | ret = 0; | |
1048 | list_for_each_entry(tcegrp, &container->group_list, next) { | |
1049 | ret = vfio_spapr_iommu_eeh_ioctl(tcegrp->grp, | |
1050 | cmd, arg); | |
1051 | if (ret) | |
1052 | return ret; | |
1053 | } | |
1054 | return ret; | |
1055 | } | |
1056 | ||
e633bc86 AK |
1057 | case VFIO_IOMMU_SPAPR_TCE_CREATE: { |
1058 | struct vfio_iommu_spapr_tce_create create; | |
1059 | ||
1060 | if (!container->v2) | |
1061 | break; | |
1062 | ||
bc82d122 AK |
1063 | ret = tce_iommu_mm_set(container); |
1064 | if (ret) | |
1065 | return ret; | |
1066 | ||
e633bc86 AK |
1067 | if (!tce_groups_attached(container)) |
1068 | return -ENXIO; | |
1069 | ||
1070 | minsz = offsetofend(struct vfio_iommu_spapr_tce_create, | |
1071 | start_addr); | |
1072 | ||
1073 | if (copy_from_user(&create, (void __user *)arg, minsz)) | |
1074 | return -EFAULT; | |
1075 | ||
1076 | if (create.argsz < minsz) | |
1077 | return -EINVAL; | |
1078 | ||
1079 | if (create.flags) | |
1080 | return -EINVAL; | |
1081 | ||
1082 | mutex_lock(&container->lock); | |
1083 | ||
d9c72894 | 1084 | ret = tce_iommu_create_default_window(container); |
2da64d20 AK |
1085 | if (!ret) |
1086 | ret = tce_iommu_create_window(container, | |
1087 | create.page_shift, | |
1088 | create.window_size, create.levels, | |
1089 | &create.start_addr); | |
e633bc86 AK |
1090 | |
1091 | mutex_unlock(&container->lock); | |
1092 | ||
1093 | if (!ret && copy_to_user((void __user *)arg, &create, minsz)) | |
1094 | ret = -EFAULT; | |
1095 | ||
1096 | return ret; | |
1097 | } | |
1098 | case VFIO_IOMMU_SPAPR_TCE_REMOVE: { | |
1099 | struct vfio_iommu_spapr_tce_remove remove; | |
1100 | ||
1101 | if (!container->v2) | |
1102 | break; | |
1103 | ||
bc82d122 AK |
1104 | ret = tce_iommu_mm_set(container); |
1105 | if (ret) | |
1106 | return ret; | |
1107 | ||
e633bc86 AK |
1108 | if (!tce_groups_attached(container)) |
1109 | return -ENXIO; | |
1110 | ||
1111 | minsz = offsetofend(struct vfio_iommu_spapr_tce_remove, | |
1112 | start_addr); | |
1113 | ||
1114 | if (copy_from_user(&remove, (void __user *)arg, minsz)) | |
1115 | return -EFAULT; | |
1116 | ||
1117 | if (remove.argsz < minsz) | |
1118 | return -EINVAL; | |
1119 | ||
1120 | if (remove.flags) | |
1121 | return -EINVAL; | |
1122 | ||
d9c72894 AK |
1123 | if (container->def_window_pending && !remove.start_addr) { |
1124 | container->def_window_pending = false; | |
1125 | return 0; | |
1126 | } | |
1127 | ||
e633bc86 AK |
1128 | mutex_lock(&container->lock); |
1129 | ||
1130 | ret = tce_iommu_remove_window(container, remove.start_addr); | |
1131 | ||
1132 | mutex_unlock(&container->lock); | |
1133 | ||
1134 | return ret; | |
1135 | } | |
5ffd229c AK |
1136 | } |
1137 | ||
1138 | return -ENOTTY; | |
1139 | } | |
1140 | ||
f87a8864 AK |
1141 | static void tce_iommu_release_ownership(struct tce_container *container, |
1142 | struct iommu_table_group *table_group) | |
1143 | { | |
1144 | int i; | |
1145 | ||
1146 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { | |
2157e7b8 | 1147 | struct iommu_table *tbl = container->tables[i]; |
f87a8864 AK |
1148 | |
1149 | if (!tbl) | |
1150 | continue; | |
1151 | ||
1152 | tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size); | |
1153 | if (tbl->it_map) | |
1154 | iommu_release_ownership(tbl); | |
2157e7b8 AK |
1155 | |
1156 | container->tables[i] = NULL; | |
f87a8864 AK |
1157 | } |
1158 | } | |
1159 | ||
1160 | static int tce_iommu_take_ownership(struct tce_container *container, | |
1161 | struct iommu_table_group *table_group) | |
1162 | { | |
1163 | int i, j, rc = 0; | |
1164 | ||
1165 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { | |
1166 | struct iommu_table *tbl = table_group->tables[i]; | |
1167 | ||
1168 | if (!tbl || !tbl->it_map) | |
1169 | continue; | |
1170 | ||
39701e56 | 1171 | rc = iommu_take_ownership(tbl); |
f87a8864 AK |
1172 | if (rc) { |
1173 | for (j = 0; j < i; ++j) | |
1174 | iommu_release_ownership( | |
1175 | table_group->tables[j]); | |
1176 | ||
1177 | return rc; | |
1178 | } | |
1179 | } | |
1180 | ||
2157e7b8 AK |
1181 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) |
1182 | container->tables[i] = table_group->tables[i]; | |
1183 | ||
f87a8864 AK |
1184 | return 0; |
1185 | } | |
1186 | ||
1187 | static void tce_iommu_release_ownership_ddw(struct tce_container *container, | |
1188 | struct iommu_table_group *table_group) | |
1189 | { | |
46d3e1e1 AK |
1190 | long i; |
1191 | ||
1192 | if (!table_group->ops->unset_window) { | |
1193 | WARN_ON_ONCE(1); | |
1194 | return; | |
1195 | } | |
1196 | ||
2157e7b8 | 1197 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) |
a3906855 AK |
1198 | if (container->tables[i]) |
1199 | table_group->ops->unset_window(table_group, i); | |
46d3e1e1 | 1200 | |
f87a8864 AK |
1201 | table_group->ops->release_ownership(table_group); |
1202 | } | |
1203 | ||
1204 | static long tce_iommu_take_ownership_ddw(struct tce_container *container, | |
1205 | struct iommu_table_group *table_group) | |
1206 | { | |
930a42de AK |
1207 | long i, ret = 0; |
1208 | ||
46d3e1e1 AK |
1209 | if (!table_group->ops->create_table || !table_group->ops->set_window || |
1210 | !table_group->ops->release_ownership) { | |
1211 | WARN_ON_ONCE(1); | |
1212 | return -EFAULT; | |
1213 | } | |
1214 | ||
f87a8864 AK |
1215 | table_group->ops->take_ownership(table_group); |
1216 | ||
930a42de AK |
1217 | /* Set all windows to the new group */ |
1218 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { | |
1219 | struct iommu_table *tbl = container->tables[i]; | |
1220 | ||
1221 | if (!tbl) | |
1222 | continue; | |
1223 | ||
1224 | ret = table_group->ops->set_window(table_group, i, tbl); | |
1225 | if (ret) | |
1226 | goto release_exit; | |
1227 | } | |
1228 | ||
2157e7b8 | 1229 | return 0; |
930a42de AK |
1230 | |
1231 | release_exit: | |
1232 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) | |
1233 | table_group->ops->unset_window(table_group, i); | |
1234 | ||
1235 | table_group->ops->release_ownership(table_group); | |
1236 | ||
1237 | return ret; | |
f87a8864 AK |
1238 | } |
1239 | ||
5ffd229c AK |
1240 | static int tce_iommu_attach_group(void *iommu_data, |
1241 | struct iommu_group *iommu_group) | |
1242 | { | |
78becab9 | 1243 | int ret = 0; |
5ffd229c | 1244 | struct tce_container *container = iommu_data; |
0eaf4def | 1245 | struct iommu_table_group *table_group; |
2157e7b8 | 1246 | struct tce_iommu_group *tcegrp = NULL; |
5ffd229c | 1247 | |
5ffd229c AK |
1248 | mutex_lock(&container->lock); |
1249 | ||
1250 | /* pr_debug("tce_vfio: Attaching group #%u to iommu %p\n", | |
1251 | iommu_group_id(iommu_group), iommu_group); */ | |
2157e7b8 | 1252 | table_group = iommu_group_get_iommudata(iommu_group); |
bd00fdf1 GK |
1253 | if (!table_group) { |
1254 | ret = -ENODEV; | |
1255 | goto unlock_exit; | |
1256 | } | |
2157e7b8 AK |
1257 | |
1258 | if (tce_groups_attached(container) && (!table_group->ops || | |
1259 | !table_group->ops->take_ownership || | |
1260 | !table_group->ops->release_ownership)) { | |
5ffd229c | 1261 | ret = -EBUSY; |
22af4859 AK |
1262 | goto unlock_exit; |
1263 | } | |
1264 | ||
2157e7b8 AK |
1265 | /* Check if new group has the same iommu_ops (i.e. compatible) */ |
1266 | list_for_each_entry(tcegrp, &container->group_list, next) { | |
1267 | struct iommu_table_group *table_group_tmp; | |
1268 | ||
1269 | if (tcegrp->grp == iommu_group) { | |
1270 | pr_warn("tce_vfio: Group %d is already attached\n", | |
1271 | iommu_group_id(iommu_group)); | |
1272 | ret = -EBUSY; | |
1273 | goto unlock_exit; | |
1274 | } | |
1275 | table_group_tmp = iommu_group_get_iommudata(tcegrp->grp); | |
54de285b AK |
1276 | if (table_group_tmp->ops->create_table != |
1277 | table_group->ops->create_table) { | |
2157e7b8 AK |
1278 | pr_warn("tce_vfio: Group %d is incompatible with group %d\n", |
1279 | iommu_group_id(iommu_group), | |
1280 | iommu_group_id(tcegrp->grp)); | |
1281 | ret = -EPERM; | |
1282 | goto unlock_exit; | |
1283 | } | |
5ffd229c AK |
1284 | } |
1285 | ||
2157e7b8 AK |
1286 | tcegrp = kzalloc(sizeof(*tcegrp), GFP_KERNEL); |
1287 | if (!tcegrp) { | |
1288 | ret = -ENOMEM; | |
0eaf4def AK |
1289 | goto unlock_exit; |
1290 | } | |
1291 | ||
f87a8864 | 1292 | if (!table_group->ops || !table_group->ops->take_ownership || |
6f01cc69 | 1293 | !table_group->ops->release_ownership) { |
1282ba7f AK |
1294 | if (container->v2) { |
1295 | ret = -EPERM; | |
78becab9 | 1296 | goto free_exit; |
1282ba7f | 1297 | } |
f87a8864 | 1298 | ret = tce_iommu_take_ownership(container, table_group); |
6f01cc69 | 1299 | } else { |
1282ba7f AK |
1300 | if (!container->v2) { |
1301 | ret = -EPERM; | |
78becab9 | 1302 | goto free_exit; |
1282ba7f | 1303 | } |
f87a8864 | 1304 | ret = tce_iommu_take_ownership_ddw(container, table_group); |
6f01cc69 | 1305 | if (!tce_groups_attached(container) && !container->tables[0]) |
d9c72894 | 1306 | container->def_window_pending = true; |
6f01cc69 | 1307 | } |
f87a8864 | 1308 | |
2157e7b8 AK |
1309 | if (!ret) { |
1310 | tcegrp->grp = iommu_group; | |
1311 | list_add(&tcegrp->next, &container->group_list); | |
1312 | } | |
22af4859 | 1313 | |
78becab9 | 1314 | free_exit: |
2157e7b8 AK |
1315 | if (ret && tcegrp) |
1316 | kfree(tcegrp); | |
1317 | ||
78becab9 | 1318 | unlock_exit: |
5ffd229c AK |
1319 | mutex_unlock(&container->lock); |
1320 | ||
1321 | return ret; | |
1322 | } | |
1323 | ||
1324 | static void tce_iommu_detach_group(void *iommu_data, | |
1325 | struct iommu_group *iommu_group) | |
1326 | { | |
1327 | struct tce_container *container = iommu_data; | |
0eaf4def | 1328 | struct iommu_table_group *table_group; |
2157e7b8 AK |
1329 | bool found = false; |
1330 | struct tce_iommu_group *tcegrp; | |
5ffd229c | 1331 | |
5ffd229c | 1332 | mutex_lock(&container->lock); |
2157e7b8 AK |
1333 | |
1334 | list_for_each_entry(tcegrp, &container->group_list, next) { | |
1335 | if (tcegrp->grp == iommu_group) { | |
1336 | found = true; | |
1337 | break; | |
1338 | } | |
22af4859 | 1339 | } |
5ffd229c | 1340 | |
2157e7b8 AK |
1341 | if (!found) { |
1342 | pr_warn("tce_vfio: detaching unattached group #%u\n", | |
1343 | iommu_group_id(iommu_group)); | |
1344 | goto unlock_exit; | |
5ffd229c | 1345 | } |
22af4859 | 1346 | |
2157e7b8 AK |
1347 | list_del(&tcegrp->next); |
1348 | kfree(tcegrp); | |
0eaf4def AK |
1349 | |
1350 | table_group = iommu_group_get_iommudata(iommu_group); | |
1351 | BUG_ON(!table_group); | |
1352 | ||
f87a8864 AK |
1353 | if (!table_group->ops || !table_group->ops->release_ownership) |
1354 | tce_iommu_release_ownership(container, table_group); | |
1355 | else | |
1356 | tce_iommu_release_ownership_ddw(container, table_group); | |
22af4859 AK |
1357 | |
1358 | unlock_exit: | |
5ffd229c AK |
1359 | mutex_unlock(&container->lock); |
1360 | } | |
1361 | ||
e39dd513 | 1362 | static const struct vfio_iommu_driver_ops tce_iommu_driver_ops = { |
5ffd229c AK |
1363 | .name = "iommu-vfio-powerpc", |
1364 | .owner = THIS_MODULE, | |
1365 | .open = tce_iommu_open, | |
1366 | .release = tce_iommu_release, | |
1367 | .ioctl = tce_iommu_ioctl, | |
1368 | .attach_group = tce_iommu_attach_group, | |
1369 | .detach_group = tce_iommu_detach_group, | |
1370 | }; | |
1371 | ||
1372 | static int __init tce_iommu_init(void) | |
1373 | { | |
1374 | return vfio_register_iommu_driver(&tce_iommu_driver_ops); | |
1375 | } | |
1376 | ||
1377 | static void __exit tce_iommu_cleanup(void) | |
1378 | { | |
1379 | vfio_unregister_iommu_driver(&tce_iommu_driver_ops); | |
1380 | } | |
1381 | ||
1382 | module_init(tce_iommu_init); | |
1383 | module_exit(tce_iommu_cleanup); | |
1384 | ||
1385 | MODULE_VERSION(DRIVER_VERSION); | |
1386 | MODULE_LICENSE("GPL v2"); | |
1387 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
1388 | MODULE_DESCRIPTION(DRIVER_DESC); | |
1389 |