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> |
6e84f315 | 23 | #include <linux/sched/mm.h> |
3f07c014 | 24 | #include <linux/sched/signal.h> |
6e84f315 | 25 | |
5ffd229c AK |
26 | #include <asm/iommu.h> |
27 | #include <asm/tce.h> | |
2157e7b8 | 28 | #include <asm/mmu_context.h> |
5ffd229c AK |
29 | |
30 | #define DRIVER_VERSION "0.1" | |
31 | #define DRIVER_AUTHOR "aik@ozlabs.ru" | |
32 | #define DRIVER_DESC "VFIO IOMMU SPAPR TCE" | |
33 | ||
34 | static void tce_iommu_detach_group(void *iommu_data, | |
35 | struct iommu_group *iommu_group); | |
36 | ||
bc82d122 | 37 | static long try_increment_locked_vm(struct mm_struct *mm, long npages) |
2d270df8 AK |
38 | { |
39 | long ret = 0, locked, lock_limit; | |
40 | ||
bc82d122 AK |
41 | if (WARN_ON_ONCE(!mm)) |
42 | return -EPERM; | |
2d270df8 AK |
43 | |
44 | if (!npages) | |
45 | return 0; | |
46 | ||
bc82d122 AK |
47 | down_write(&mm->mmap_sem); |
48 | locked = mm->locked_vm + npages; | |
2d270df8 AK |
49 | lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; |
50 | if (locked > lock_limit && !capable(CAP_IPC_LOCK)) | |
51 | ret = -ENOMEM; | |
52 | else | |
bc82d122 | 53 | mm->locked_vm += npages; |
2d270df8 AK |
54 | |
55 | pr_debug("[%d] RLIMIT_MEMLOCK +%ld %ld/%ld%s\n", current->pid, | |
56 | npages << PAGE_SHIFT, | |
bc82d122 | 57 | mm->locked_vm << PAGE_SHIFT, |
2d270df8 AK |
58 | rlimit(RLIMIT_MEMLOCK), |
59 | ret ? " - exceeded" : ""); | |
60 | ||
bc82d122 | 61 | up_write(&mm->mmap_sem); |
2d270df8 AK |
62 | |
63 | return ret; | |
64 | } | |
65 | ||
bc82d122 | 66 | static void decrement_locked_vm(struct mm_struct *mm, long npages) |
2d270df8 | 67 | { |
bc82d122 AK |
68 | if (!mm || !npages) |
69 | return; | |
2d270df8 | 70 | |
bc82d122 AK |
71 | down_write(&mm->mmap_sem); |
72 | if (WARN_ON_ONCE(npages > mm->locked_vm)) | |
73 | npages = mm->locked_vm; | |
74 | mm->locked_vm -= npages; | |
2d270df8 AK |
75 | pr_debug("[%d] RLIMIT_MEMLOCK -%ld %ld/%ld\n", current->pid, |
76 | npages << PAGE_SHIFT, | |
bc82d122 | 77 | mm->locked_vm << PAGE_SHIFT, |
2d270df8 | 78 | rlimit(RLIMIT_MEMLOCK)); |
bc82d122 | 79 | up_write(&mm->mmap_sem); |
2d270df8 AK |
80 | } |
81 | ||
5ffd229c AK |
82 | /* |
83 | * VFIO IOMMU fd for SPAPR_TCE IOMMU implementation | |
84 | * | |
85 | * This code handles mapping and unmapping of user data buffers | |
86 | * into DMA'ble space using the IOMMU | |
87 | */ | |
88 | ||
2157e7b8 AK |
89 | struct tce_iommu_group { |
90 | struct list_head next; | |
91 | struct iommu_group *grp; | |
92 | }; | |
93 | ||
4b6fad70 AK |
94 | /* |
95 | * A container needs to remember which preregistered region it has | |
96 | * referenced to do proper cleanup at the userspace process exit. | |
97 | */ | |
98 | struct tce_iommu_prereg { | |
99 | struct list_head next; | |
100 | struct mm_iommu_table_group_mem_t *mem; | |
101 | }; | |
102 | ||
5ffd229c AK |
103 | /* |
104 | * The container descriptor supports only a single group per container. | |
105 | * Required by the API as the container is not supplied with the IOMMU group | |
106 | * at the moment of initialization. | |
107 | */ | |
108 | struct tce_container { | |
109 | struct mutex lock; | |
5ffd229c | 110 | bool enabled; |
2157e7b8 | 111 | bool v2; |
d9c72894 | 112 | bool def_window_pending; |
2d270df8 | 113 | unsigned long locked_pages; |
bc82d122 | 114 | struct mm_struct *mm; |
2157e7b8 AK |
115 | struct iommu_table *tables[IOMMU_TABLE_GROUP_MAX_TABLES]; |
116 | struct list_head group_list; | |
4b6fad70 | 117 | struct list_head prereg_list; |
5ffd229c AK |
118 | }; |
119 | ||
bc82d122 AK |
120 | static long tce_iommu_mm_set(struct tce_container *container) |
121 | { | |
122 | if (container->mm) { | |
123 | if (container->mm == current->mm) | |
124 | return 0; | |
125 | return -EPERM; | |
126 | } | |
127 | BUG_ON(!current->mm); | |
128 | container->mm = current->mm; | |
129 | atomic_inc(&container->mm->mm_count); | |
130 | ||
131 | return 0; | |
132 | } | |
133 | ||
4b6fad70 AK |
134 | static long tce_iommu_prereg_free(struct tce_container *container, |
135 | struct tce_iommu_prereg *tcemem) | |
136 | { | |
137 | long ret; | |
138 | ||
139 | ret = mm_iommu_put(container->mm, tcemem->mem); | |
140 | if (ret) | |
141 | return ret; | |
142 | ||
143 | list_del(&tcemem->next); | |
144 | kfree(tcemem); | |
145 | ||
146 | return 0; | |
147 | } | |
148 | ||
2157e7b8 AK |
149 | static long tce_iommu_unregister_pages(struct tce_container *container, |
150 | __u64 vaddr, __u64 size) | |
151 | { | |
152 | struct mm_iommu_table_group_mem_t *mem; | |
4b6fad70 AK |
153 | struct tce_iommu_prereg *tcemem; |
154 | bool found = false; | |
2157e7b8 AK |
155 | |
156 | if ((vaddr & ~PAGE_MASK) || (size & ~PAGE_MASK)) | |
157 | return -EINVAL; | |
158 | ||
bc82d122 | 159 | mem = mm_iommu_find(container->mm, vaddr, size >> PAGE_SHIFT); |
2157e7b8 AK |
160 | if (!mem) |
161 | return -ENOENT; | |
162 | ||
4b6fad70 AK |
163 | list_for_each_entry(tcemem, &container->prereg_list, next) { |
164 | if (tcemem->mem == mem) { | |
165 | found = true; | |
166 | break; | |
167 | } | |
168 | } | |
169 | ||
170 | if (!found) | |
171 | return -ENOENT; | |
172 | ||
173 | return tce_iommu_prereg_free(container, tcemem); | |
2157e7b8 AK |
174 | } |
175 | ||
176 | static long tce_iommu_register_pages(struct tce_container *container, | |
177 | __u64 vaddr, __u64 size) | |
178 | { | |
179 | long ret = 0; | |
180 | struct mm_iommu_table_group_mem_t *mem = NULL; | |
4b6fad70 | 181 | struct tce_iommu_prereg *tcemem; |
2157e7b8 AK |
182 | unsigned long entries = size >> PAGE_SHIFT; |
183 | ||
184 | if ((vaddr & ~PAGE_MASK) || (size & ~PAGE_MASK) || | |
185 | ((vaddr + size) < vaddr)) | |
186 | return -EINVAL; | |
187 | ||
4b6fad70 AK |
188 | mem = mm_iommu_find(container->mm, vaddr, entries); |
189 | if (mem) { | |
190 | list_for_each_entry(tcemem, &container->prereg_list, next) { | |
191 | if (tcemem->mem == mem) | |
192 | return -EBUSY; | |
193 | } | |
194 | } | |
195 | ||
bc82d122 | 196 | ret = mm_iommu_get(container->mm, vaddr, entries, &mem); |
2157e7b8 AK |
197 | if (ret) |
198 | return ret; | |
199 | ||
4b6fad70 | 200 | tcemem = kzalloc(sizeof(*tcemem), GFP_KERNEL); |
3393af24 AK |
201 | if (!tcemem) { |
202 | mm_iommu_put(container->mm, mem); | |
203 | return -ENOMEM; | |
204 | } | |
205 | ||
4b6fad70 AK |
206 | tcemem->mem = mem; |
207 | list_add(&tcemem->next, &container->prereg_list); | |
208 | ||
2157e7b8 AK |
209 | container->enabled = true; |
210 | ||
211 | return 0; | |
212 | } | |
213 | ||
e432bc7e AK |
214 | static bool tce_page_is_contained(struct page *page, unsigned page_shift) |
215 | { | |
216 | /* | |
217 | * Check that the TCE table granularity is not bigger than the size of | |
218 | * a page we just found. Otherwise the hardware can get access to | |
219 | * a bigger memory chunk that it should. | |
220 | */ | |
221 | return (PAGE_SHIFT + compound_order(compound_head(page))) >= page_shift; | |
222 | } | |
223 | ||
2157e7b8 AK |
224 | static inline bool tce_groups_attached(struct tce_container *container) |
225 | { | |
226 | return !list_empty(&container->group_list); | |
227 | } | |
228 | ||
0eaf4def AK |
229 | static long tce_iommu_find_table(struct tce_container *container, |
230 | phys_addr_t ioba, struct iommu_table **ptbl) | |
231 | { | |
232 | long i; | |
0eaf4def AK |
233 | |
234 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { | |
2157e7b8 | 235 | struct iommu_table *tbl = container->tables[i]; |
0eaf4def AK |
236 | |
237 | if (tbl) { | |
238 | unsigned long entry = ioba >> tbl->it_page_shift; | |
239 | unsigned long start = tbl->it_offset; | |
240 | unsigned long end = start + tbl->it_size; | |
241 | ||
242 | if ((start <= entry) && (entry < end)) { | |
243 | *ptbl = tbl; | |
244 | return i; | |
245 | } | |
246 | } | |
247 | } | |
248 | ||
249 | return -1; | |
250 | } | |
251 | ||
e633bc86 AK |
252 | static int tce_iommu_find_free_table(struct tce_container *container) |
253 | { | |
254 | int i; | |
255 | ||
256 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { | |
257 | if (!container->tables[i]) | |
258 | return i; | |
259 | } | |
260 | ||
261 | return -ENOSPC; | |
262 | } | |
263 | ||
5ffd229c AK |
264 | static int tce_iommu_enable(struct tce_container *container) |
265 | { | |
266 | int ret = 0; | |
2d270df8 | 267 | unsigned long locked; |
0eaf4def | 268 | struct iommu_table_group *table_group; |
2157e7b8 | 269 | struct tce_iommu_group *tcegrp; |
5ffd229c | 270 | |
5ffd229c AK |
271 | if (container->enabled) |
272 | return -EBUSY; | |
273 | ||
274 | /* | |
275 | * When userspace pages are mapped into the IOMMU, they are effectively | |
276 | * locked memory, so, theoretically, we need to update the accounting | |
277 | * of locked pages on each map and unmap. For powerpc, the map unmap | |
278 | * paths can be very hot, though, and the accounting would kill | |
279 | * performance, especially since it would be difficult to impossible | |
280 | * to handle the accounting in real mode only. | |
281 | * | |
282 | * To address that, rather than precisely accounting every page, we | |
283 | * instead account for a worst case on locked memory when the iommu is | |
284 | * enabled and disabled. The worst case upper bound on locked memory | |
285 | * is the size of the whole iommu window, which is usually relatively | |
286 | * small (compared to total memory sizes) on POWER hardware. | |
287 | * | |
288 | * Also we don't have a nice way to fail on H_PUT_TCE due to ulimits, | |
289 | * that would effectively kill the guest at random points, much better | |
290 | * enforcing the limit based on the max that the guest can map. | |
2d270df8 AK |
291 | * |
292 | * Unfortunately at the moment it counts whole tables, no matter how | |
293 | * much memory the guest has. I.e. for 4GB guest and 4 IOMMU groups | |
294 | * each with 2GB DMA window, 8GB will be counted here. The reason for | |
295 | * this is that we cannot tell here the amount of RAM used by the guest | |
296 | * as this information is only available from KVM and VFIO is | |
297 | * KVM agnostic. | |
4793d65d AK |
298 | * |
299 | * So we do not allow enabling a container without a group attached | |
300 | * as there is no way to know how much we should increment | |
301 | * the locked_vm counter. | |
5ffd229c | 302 | */ |
2157e7b8 AK |
303 | if (!tce_groups_attached(container)) |
304 | return -ENODEV; | |
305 | ||
306 | tcegrp = list_first_entry(&container->group_list, | |
307 | struct tce_iommu_group, next); | |
308 | table_group = iommu_group_get_iommudata(tcegrp->grp); | |
0eaf4def AK |
309 | if (!table_group) |
310 | return -ENODEV; | |
311 | ||
4793d65d AK |
312 | if (!table_group->tce32_size) |
313 | return -EPERM; | |
314 | ||
bc82d122 AK |
315 | ret = tce_iommu_mm_set(container); |
316 | if (ret) | |
317 | return ret; | |
318 | ||
4793d65d | 319 | locked = table_group->tce32_size >> PAGE_SHIFT; |
bc82d122 | 320 | ret = try_increment_locked_vm(container->mm, locked); |
2d270df8 AK |
321 | if (ret) |
322 | return ret; | |
5ffd229c | 323 | |
2d270df8 AK |
324 | container->locked_pages = locked; |
325 | ||
326 | container->enabled = true; | |
5ffd229c AK |
327 | |
328 | return ret; | |
329 | } | |
330 | ||
331 | static void tce_iommu_disable(struct tce_container *container) | |
332 | { | |
333 | if (!container->enabled) | |
334 | return; | |
335 | ||
336 | container->enabled = false; | |
337 | ||
bc82d122 AK |
338 | BUG_ON(!container->mm); |
339 | decrement_locked_vm(container->mm, container->locked_pages); | |
5ffd229c AK |
340 | } |
341 | ||
342 | static void *tce_iommu_open(unsigned long arg) | |
343 | { | |
344 | struct tce_container *container; | |
345 | ||
2157e7b8 | 346 | if ((arg != VFIO_SPAPR_TCE_IOMMU) && (arg != VFIO_SPAPR_TCE_v2_IOMMU)) { |
5ffd229c AK |
347 | pr_err("tce_vfio: Wrong IOMMU type\n"); |
348 | return ERR_PTR(-EINVAL); | |
349 | } | |
350 | ||
351 | container = kzalloc(sizeof(*container), GFP_KERNEL); | |
352 | if (!container) | |
353 | return ERR_PTR(-ENOMEM); | |
354 | ||
355 | mutex_init(&container->lock); | |
2157e7b8 | 356 | INIT_LIST_HEAD_RCU(&container->group_list); |
4b6fad70 | 357 | INIT_LIST_HEAD_RCU(&container->prereg_list); |
2157e7b8 AK |
358 | |
359 | container->v2 = arg == VFIO_SPAPR_TCE_v2_IOMMU; | |
5ffd229c AK |
360 | |
361 | return container; | |
362 | } | |
363 | ||
2157e7b8 AK |
364 | static int tce_iommu_clear(struct tce_container *container, |
365 | struct iommu_table *tbl, | |
366 | unsigned long entry, unsigned long pages); | |
bc82d122 AK |
367 | static void tce_iommu_free_table(struct tce_container *container, |
368 | struct iommu_table *tbl); | |
2157e7b8 | 369 | |
5ffd229c AK |
370 | static void tce_iommu_release(void *iommu_data) |
371 | { | |
372 | struct tce_container *container = iommu_data; | |
2157e7b8 AK |
373 | struct tce_iommu_group *tcegrp; |
374 | long i; | |
5ffd229c | 375 | |
2157e7b8 AK |
376 | while (tce_groups_attached(container)) { |
377 | tcegrp = list_first_entry(&container->group_list, | |
378 | struct tce_iommu_group, next); | |
2157e7b8 AK |
379 | tce_iommu_detach_group(iommu_data, tcegrp->grp); |
380 | } | |
5ffd229c | 381 | |
2157e7b8 AK |
382 | /* |
383 | * If VFIO created a table, it was not disposed | |
384 | * by tce_iommu_detach_group() so do it now. | |
385 | */ | |
386 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { | |
387 | struct iommu_table *tbl = container->tables[i]; | |
388 | ||
389 | if (!tbl) | |
390 | continue; | |
391 | ||
392 | tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size); | |
bc82d122 | 393 | tce_iommu_free_table(container, tbl); |
2157e7b8 | 394 | } |
5ffd229c | 395 | |
4b6fad70 AK |
396 | while (!list_empty(&container->prereg_list)) { |
397 | struct tce_iommu_prereg *tcemem; | |
398 | ||
399 | tcemem = list_first_entry(&container->prereg_list, | |
400 | struct tce_iommu_prereg, next); | |
401 | WARN_ON_ONCE(tce_iommu_prereg_free(container, tcemem)); | |
402 | } | |
403 | ||
649354b7 | 404 | tce_iommu_disable(container); |
bc82d122 AK |
405 | if (container->mm) |
406 | mmdrop(container->mm); | |
5ffd229c AK |
407 | mutex_destroy(&container->lock); |
408 | ||
409 | kfree(container); | |
410 | } | |
411 | ||
649354b7 | 412 | static void tce_iommu_unuse_page(struct tce_container *container, |
05c6cfb9 | 413 | unsigned long hpa) |
649354b7 AK |
414 | { |
415 | struct page *page; | |
416 | ||
05c6cfb9 | 417 | page = pfn_to_page(hpa >> PAGE_SHIFT); |
649354b7 AK |
418 | put_page(page); |
419 | } | |
420 | ||
bc82d122 | 421 | static int tce_iommu_prereg_ua_to_hpa(struct tce_container *container, |
1463edca | 422 | unsigned long tce, unsigned long shift, |
2157e7b8 AK |
423 | unsigned long *phpa, struct mm_iommu_table_group_mem_t **pmem) |
424 | { | |
425 | long ret = 0; | |
426 | struct mm_iommu_table_group_mem_t *mem; | |
427 | ||
1463edca | 428 | mem = mm_iommu_lookup(container->mm, tce, 1ULL << shift); |
2157e7b8 AK |
429 | if (!mem) |
430 | return -EINVAL; | |
431 | ||
76fa4975 | 432 | ret = mm_iommu_ua_to_hpa(mem, tce, shift, phpa); |
2157e7b8 AK |
433 | if (ret) |
434 | return -EINVAL; | |
435 | ||
436 | *pmem = mem; | |
437 | ||
438 | return 0; | |
439 | } | |
440 | ||
bc82d122 AK |
441 | static void tce_iommu_unuse_page_v2(struct tce_container *container, |
442 | struct iommu_table *tbl, unsigned long entry) | |
2157e7b8 AK |
443 | { |
444 | struct mm_iommu_table_group_mem_t *mem = NULL; | |
445 | int ret; | |
446 | unsigned long hpa = 0; | |
00a5c58d | 447 | __be64 *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl, entry); |
2157e7b8 | 448 | |
bc82d122 | 449 | if (!pua) |
2157e7b8 AK |
450 | return; |
451 | ||
00a5c58d | 452 | ret = tce_iommu_prereg_ua_to_hpa(container, be64_to_cpu(*pua), |
b3124ec2 | 453 | tbl->it_page_shift, &hpa, &mem); |
2157e7b8 | 454 | if (ret) |
00a5c58d AK |
455 | pr_debug("%s: tce %llx at #%lx was not cached, ret=%d\n", |
456 | __func__, be64_to_cpu(*pua), entry, ret); | |
2157e7b8 AK |
457 | if (mem) |
458 | mm_iommu_mapped_dec(mem); | |
459 | ||
00a5c58d | 460 | *pua = cpu_to_be64(0); |
2157e7b8 AK |
461 | } |
462 | ||
9b14a1ff AK |
463 | static int tce_iommu_clear(struct tce_container *container, |
464 | struct iommu_table *tbl, | |
465 | unsigned long entry, unsigned long pages) | |
466 | { | |
05c6cfb9 AK |
467 | unsigned long oldhpa; |
468 | long ret; | |
469 | enum dma_data_direction direction; | |
9b14a1ff AK |
470 | |
471 | for ( ; pages; --pages, ++entry) { | |
5c2fefd8 AK |
472 | cond_resched(); |
473 | ||
05c6cfb9 AK |
474 | direction = DMA_NONE; |
475 | oldhpa = 0; | |
476 | ret = iommu_tce_xchg(tbl, entry, &oldhpa, &direction); | |
477 | if (ret) | |
478 | continue; | |
479 | ||
480 | if (direction == DMA_NONE) | |
9b14a1ff AK |
481 | continue; |
482 | ||
2157e7b8 | 483 | if (container->v2) { |
bc82d122 | 484 | tce_iommu_unuse_page_v2(container, tbl, entry); |
2157e7b8 AK |
485 | continue; |
486 | } | |
487 | ||
05c6cfb9 | 488 | tce_iommu_unuse_page(container, oldhpa); |
9b14a1ff AK |
489 | } |
490 | ||
491 | return 0; | |
492 | } | |
493 | ||
649354b7 AK |
494 | static int tce_iommu_use_page(unsigned long tce, unsigned long *hpa) |
495 | { | |
496 | struct page *page = NULL; | |
497 | enum dma_data_direction direction = iommu_tce_direction(tce); | |
498 | ||
499 | if (get_user_pages_fast(tce & PAGE_MASK, 1, | |
500 | direction != DMA_TO_DEVICE, &page) != 1) | |
501 | return -EFAULT; | |
502 | ||
503 | *hpa = __pa((unsigned long) page_address(page)); | |
504 | ||
505 | return 0; | |
506 | } | |
507 | ||
9b14a1ff AK |
508 | static long tce_iommu_build(struct tce_container *container, |
509 | struct iommu_table *tbl, | |
05c6cfb9 AK |
510 | unsigned long entry, unsigned long tce, unsigned long pages, |
511 | enum dma_data_direction direction) | |
9b14a1ff AK |
512 | { |
513 | long i, ret = 0; | |
649354b7 AK |
514 | struct page *page; |
515 | unsigned long hpa; | |
05c6cfb9 | 516 | enum dma_data_direction dirtmp; |
9b14a1ff AK |
517 | |
518 | for (i = 0; i < pages; ++i) { | |
519 | unsigned long offset = tce & IOMMU_PAGE_MASK(tbl) & ~PAGE_MASK; | |
520 | ||
649354b7 AK |
521 | ret = tce_iommu_use_page(tce, &hpa); |
522 | if (ret) | |
9b14a1ff | 523 | break; |
e432bc7e | 524 | |
649354b7 | 525 | page = pfn_to_page(hpa >> PAGE_SHIFT); |
e432bc7e AK |
526 | if (!tce_page_is_contained(page, tbl->it_page_shift)) { |
527 | ret = -EPERM; | |
528 | break; | |
529 | } | |
530 | ||
649354b7 | 531 | hpa |= offset; |
05c6cfb9 AK |
532 | dirtmp = direction; |
533 | ret = iommu_tce_xchg(tbl, entry + i, &hpa, &dirtmp); | |
9b14a1ff | 534 | if (ret) { |
649354b7 | 535 | tce_iommu_unuse_page(container, hpa); |
9b14a1ff AK |
536 | pr_err("iommu_tce: %s failed ioba=%lx, tce=%lx, ret=%ld\n", |
537 | __func__, entry << tbl->it_page_shift, | |
538 | tce, ret); | |
539 | break; | |
540 | } | |
05c6cfb9 AK |
541 | |
542 | if (dirtmp != DMA_NONE) | |
543 | tce_iommu_unuse_page(container, hpa); | |
544 | ||
00663d4e | 545 | tce += IOMMU_PAGE_SIZE(tbl); |
9b14a1ff AK |
546 | } |
547 | ||
548 | if (ret) | |
549 | tce_iommu_clear(container, tbl, entry, i); | |
550 | ||
551 | return ret; | |
552 | } | |
553 | ||
2157e7b8 AK |
554 | static long tce_iommu_build_v2(struct tce_container *container, |
555 | struct iommu_table *tbl, | |
556 | unsigned long entry, unsigned long tce, unsigned long pages, | |
557 | enum dma_data_direction direction) | |
558 | { | |
559 | long i, ret = 0; | |
560 | struct page *page; | |
561 | unsigned long hpa; | |
562 | enum dma_data_direction dirtmp; | |
563 | ||
564 | for (i = 0; i < pages; ++i) { | |
565 | struct mm_iommu_table_group_mem_t *mem = NULL; | |
00a5c58d | 566 | __be64 *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl, entry + i); |
2157e7b8 | 567 | |
bc82d122 | 568 | ret = tce_iommu_prereg_ua_to_hpa(container, |
1463edca | 569 | tce, tbl->it_page_shift, &hpa, &mem); |
2157e7b8 AK |
570 | if (ret) |
571 | break; | |
572 | ||
573 | page = pfn_to_page(hpa >> PAGE_SHIFT); | |
574 | if (!tce_page_is_contained(page, tbl->it_page_shift)) { | |
575 | ret = -EPERM; | |
576 | break; | |
577 | } | |
578 | ||
579 | /* Preserve offset within IOMMU page */ | |
580 | hpa |= tce & IOMMU_PAGE_MASK(tbl) & ~PAGE_MASK; | |
581 | dirtmp = direction; | |
582 | ||
583 | /* The registered region is being unregistered */ | |
584 | if (mm_iommu_mapped_inc(mem)) | |
585 | break; | |
586 | ||
587 | ret = iommu_tce_xchg(tbl, entry + i, &hpa, &dirtmp); | |
588 | if (ret) { | |
589 | /* dirtmp cannot be DMA_NONE here */ | |
bc82d122 | 590 | tce_iommu_unuse_page_v2(container, tbl, entry + i); |
2157e7b8 AK |
591 | pr_err("iommu_tce: %s failed ioba=%lx, tce=%lx, ret=%ld\n", |
592 | __func__, entry << tbl->it_page_shift, | |
593 | tce, ret); | |
594 | break; | |
595 | } | |
596 | ||
597 | if (dirtmp != DMA_NONE) | |
bc82d122 | 598 | tce_iommu_unuse_page_v2(container, tbl, entry + i); |
2157e7b8 | 599 | |
00a5c58d | 600 | *pua = cpu_to_be64(tce); |
2157e7b8 AK |
601 | |
602 | tce += IOMMU_PAGE_SIZE(tbl); | |
603 | } | |
604 | ||
605 | if (ret) | |
606 | tce_iommu_clear(container, tbl, entry, i); | |
607 | ||
608 | return ret; | |
609 | } | |
610 | ||
46d3e1e1 AK |
611 | static long tce_iommu_create_table(struct tce_container *container, |
612 | struct iommu_table_group *table_group, | |
613 | int num, | |
614 | __u32 page_shift, | |
615 | __u64 window_size, | |
616 | __u32 levels, | |
617 | struct iommu_table **ptbl) | |
618 | { | |
619 | long ret, table_size; | |
620 | ||
621 | table_size = table_group->ops->get_table_size(page_shift, window_size, | |
622 | levels); | |
623 | if (!table_size) | |
624 | return -EINVAL; | |
625 | ||
bc82d122 | 626 | ret = try_increment_locked_vm(container->mm, table_size >> PAGE_SHIFT); |
46d3e1e1 AK |
627 | if (ret) |
628 | return ret; | |
629 | ||
630 | ret = table_group->ops->create_table(table_group, num, | |
631 | page_shift, window_size, levels, ptbl); | |
632 | ||
633 | WARN_ON(!ret && !(*ptbl)->it_ops->free); | |
a68bd126 | 634 | WARN_ON(!ret && ((*ptbl)->it_allocated_size > table_size)); |
46d3e1e1 | 635 | |
46d3e1e1 AK |
636 | return ret; |
637 | } | |
638 | ||
bc82d122 AK |
639 | static void tce_iommu_free_table(struct tce_container *container, |
640 | struct iommu_table *tbl) | |
46d3e1e1 AK |
641 | { |
642 | unsigned long pages = tbl->it_allocated_size >> PAGE_SHIFT; | |
643 | ||
e5afdf9d | 644 | iommu_tce_table_put(tbl); |
bc82d122 | 645 | decrement_locked_vm(container->mm, pages); |
46d3e1e1 AK |
646 | } |
647 | ||
e633bc86 AK |
648 | static long tce_iommu_create_window(struct tce_container *container, |
649 | __u32 page_shift, __u64 window_size, __u32 levels, | |
650 | __u64 *start_addr) | |
651 | { | |
652 | struct tce_iommu_group *tcegrp; | |
653 | struct iommu_table_group *table_group; | |
654 | struct iommu_table *tbl = NULL; | |
655 | long ret, num; | |
656 | ||
657 | num = tce_iommu_find_free_table(container); | |
658 | if (num < 0) | |
659 | return num; | |
660 | ||
661 | /* Get the first group for ops::create_table */ | |
662 | tcegrp = list_first_entry(&container->group_list, | |
663 | struct tce_iommu_group, next); | |
664 | table_group = iommu_group_get_iommudata(tcegrp->grp); | |
665 | if (!table_group) | |
666 | return -EFAULT; | |
667 | ||
668 | if (!(table_group->pgsizes & (1ULL << page_shift))) | |
669 | return -EINVAL; | |
670 | ||
671 | if (!table_group->ops->set_window || !table_group->ops->unset_window || | |
672 | !table_group->ops->get_table_size || | |
673 | !table_group->ops->create_table) | |
674 | return -EPERM; | |
675 | ||
676 | /* Create TCE table */ | |
677 | ret = tce_iommu_create_table(container, table_group, num, | |
678 | page_shift, window_size, levels, &tbl); | |
679 | if (ret) | |
680 | return ret; | |
681 | ||
682 | BUG_ON(!tbl->it_ops->free); | |
683 | ||
684 | /* | |
685 | * Program the table to every group. | |
686 | * Groups have been tested for compatibility at the attach time. | |
687 | */ | |
688 | list_for_each_entry(tcegrp, &container->group_list, next) { | |
689 | table_group = iommu_group_get_iommudata(tcegrp->grp); | |
690 | ||
691 | ret = table_group->ops->set_window(table_group, num, tbl); | |
692 | if (ret) | |
693 | goto unset_exit; | |
694 | } | |
695 | ||
696 | container->tables[num] = tbl; | |
697 | ||
698 | /* Return start address assigned by platform in create_table() */ | |
699 | *start_addr = tbl->it_offset << tbl->it_page_shift; | |
700 | ||
701 | return 0; | |
702 | ||
703 | unset_exit: | |
704 | list_for_each_entry(tcegrp, &container->group_list, next) { | |
705 | table_group = iommu_group_get_iommudata(tcegrp->grp); | |
706 | table_group->ops->unset_window(table_group, num); | |
707 | } | |
bc82d122 | 708 | tce_iommu_free_table(container, tbl); |
e633bc86 AK |
709 | |
710 | return ret; | |
711 | } | |
712 | ||
713 | static long tce_iommu_remove_window(struct tce_container *container, | |
714 | __u64 start_addr) | |
715 | { | |
716 | struct iommu_table_group *table_group = NULL; | |
717 | struct iommu_table *tbl; | |
718 | struct tce_iommu_group *tcegrp; | |
719 | int num; | |
720 | ||
721 | num = tce_iommu_find_table(container, start_addr, &tbl); | |
722 | if (num < 0) | |
723 | return -EINVAL; | |
724 | ||
725 | BUG_ON(!tbl->it_size); | |
726 | ||
727 | /* Detach groups from IOMMUs */ | |
728 | list_for_each_entry(tcegrp, &container->group_list, next) { | |
729 | table_group = iommu_group_get_iommudata(tcegrp->grp); | |
730 | ||
731 | /* | |
732 | * SPAPR TCE IOMMU exposes the default DMA window to | |
733 | * the guest via dma32_window_start/size of | |
734 | * VFIO_IOMMU_SPAPR_TCE_GET_INFO. Some platforms allow | |
735 | * the userspace to remove this window, some do not so | |
736 | * here we check for the platform capability. | |
737 | */ | |
738 | if (!table_group->ops || !table_group->ops->unset_window) | |
739 | return -EPERM; | |
740 | ||
741 | table_group->ops->unset_window(table_group, num); | |
742 | } | |
743 | ||
744 | /* Free table */ | |
745 | tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size); | |
bc82d122 | 746 | tce_iommu_free_table(container, tbl); |
e633bc86 AK |
747 | container->tables[num] = NULL; |
748 | ||
749 | return 0; | |
750 | } | |
751 | ||
6f01cc69 AK |
752 | static long tce_iommu_create_default_window(struct tce_container *container) |
753 | { | |
754 | long ret; | |
755 | __u64 start_addr = 0; | |
756 | struct tce_iommu_group *tcegrp; | |
757 | struct iommu_table_group *table_group; | |
758 | ||
d9c72894 AK |
759 | if (!container->def_window_pending) |
760 | return 0; | |
761 | ||
6f01cc69 AK |
762 | if (!tce_groups_attached(container)) |
763 | return -ENODEV; | |
764 | ||
765 | tcegrp = list_first_entry(&container->group_list, | |
766 | struct tce_iommu_group, next); | |
767 | table_group = iommu_group_get_iommudata(tcegrp->grp); | |
768 | if (!table_group) | |
769 | return -ENODEV; | |
770 | ||
771 | ret = tce_iommu_create_window(container, IOMMU_PAGE_SHIFT_4K, | |
772 | table_group->tce32_size, 1, &start_addr); | |
773 | WARN_ON_ONCE(!ret && start_addr); | |
774 | ||
d9c72894 AK |
775 | if (!ret) |
776 | container->def_window_pending = false; | |
777 | ||
6f01cc69 AK |
778 | return ret; |
779 | } | |
780 | ||
5ffd229c AK |
781 | static long tce_iommu_ioctl(void *iommu_data, |
782 | unsigned int cmd, unsigned long arg) | |
783 | { | |
784 | struct tce_container *container = iommu_data; | |
e633bc86 | 785 | unsigned long minsz, ddwsz; |
5ffd229c AK |
786 | long ret; |
787 | ||
788 | switch (cmd) { | |
789 | case VFIO_CHECK_EXTENSION: | |
1b69be5e GS |
790 | switch (arg) { |
791 | case VFIO_SPAPR_TCE_IOMMU: | |
2157e7b8 | 792 | case VFIO_SPAPR_TCE_v2_IOMMU: |
1b69be5e GS |
793 | ret = 1; |
794 | break; | |
795 | default: | |
796 | ret = vfio_spapr_iommu_eeh_ioctl(NULL, cmd, arg); | |
797 | break; | |
798 | } | |
799 | ||
800 | return (ret < 0) ? 0 : ret; | |
bc82d122 AK |
801 | } |
802 | ||
803 | /* | |
804 | * Sanity check to prevent one userspace from manipulating | |
805 | * another userspace mm. | |
806 | */ | |
807 | BUG_ON(!container); | |
808 | if (container->mm && container->mm != current->mm) | |
809 | return -EPERM; | |
5ffd229c | 810 | |
bc82d122 | 811 | switch (cmd) { |
5ffd229c AK |
812 | case VFIO_IOMMU_SPAPR_TCE_GET_INFO: { |
813 | struct vfio_iommu_spapr_tce_info info; | |
2157e7b8 | 814 | struct tce_iommu_group *tcegrp; |
0eaf4def AK |
815 | struct iommu_table_group *table_group; |
816 | ||
2157e7b8 | 817 | if (!tce_groups_attached(container)) |
0eaf4def AK |
818 | return -ENXIO; |
819 | ||
2157e7b8 AK |
820 | tcegrp = list_first_entry(&container->group_list, |
821 | struct tce_iommu_group, next); | |
822 | table_group = iommu_group_get_iommudata(tcegrp->grp); | |
5ffd229c | 823 | |
4793d65d | 824 | if (!table_group) |
5ffd229c AK |
825 | return -ENXIO; |
826 | ||
827 | minsz = offsetofend(struct vfio_iommu_spapr_tce_info, | |
828 | dma32_window_size); | |
829 | ||
830 | if (copy_from_user(&info, (void __user *)arg, minsz)) | |
831 | return -EFAULT; | |
832 | ||
833 | if (info.argsz < minsz) | |
834 | return -EINVAL; | |
835 | ||
4793d65d AK |
836 | info.dma32_window_start = table_group->tce32_start; |
837 | info.dma32_window_size = table_group->tce32_size; | |
5ffd229c | 838 | info.flags = 0; |
e633bc86 AK |
839 | memset(&info.ddw, 0, sizeof(info.ddw)); |
840 | ||
841 | if (table_group->max_dynamic_windows_supported && | |
842 | container->v2) { | |
843 | info.flags |= VFIO_IOMMU_SPAPR_INFO_DDW; | |
844 | info.ddw.pgsizes = table_group->pgsizes; | |
845 | info.ddw.max_dynamic_windows_supported = | |
846 | table_group->max_dynamic_windows_supported; | |
847 | info.ddw.levels = table_group->max_levels; | |
848 | } | |
849 | ||
850 | ddwsz = offsetofend(struct vfio_iommu_spapr_tce_info, ddw); | |
851 | ||
852 | if (info.argsz >= ddwsz) | |
853 | minsz = ddwsz; | |
5ffd229c AK |
854 | |
855 | if (copy_to_user((void __user *)arg, &info, minsz)) | |
856 | return -EFAULT; | |
857 | ||
858 | return 0; | |
859 | } | |
860 | case VFIO_IOMMU_MAP_DMA: { | |
861 | struct vfio_iommu_type1_dma_map param; | |
0eaf4def | 862 | struct iommu_table *tbl = NULL; |
0eaf4def | 863 | long num; |
05c6cfb9 | 864 | enum dma_data_direction direction; |
5ffd229c | 865 | |
3c56e822 AK |
866 | if (!container->enabled) |
867 | return -EPERM; | |
868 | ||
5ffd229c AK |
869 | minsz = offsetofend(struct vfio_iommu_type1_dma_map, size); |
870 | ||
871 | if (copy_from_user(¶m, (void __user *)arg, minsz)) | |
872 | return -EFAULT; | |
873 | ||
874 | if (param.argsz < minsz) | |
875 | return -EINVAL; | |
876 | ||
877 | if (param.flags & ~(VFIO_DMA_MAP_FLAG_READ | | |
878 | VFIO_DMA_MAP_FLAG_WRITE)) | |
879 | return -EINVAL; | |
880 | ||
d9c72894 AK |
881 | ret = tce_iommu_create_default_window(container); |
882 | if (ret) | |
883 | return ret; | |
884 | ||
0eaf4def AK |
885 | num = tce_iommu_find_table(container, param.iova, &tbl); |
886 | if (num < 0) | |
887 | return -ENXIO; | |
888 | ||
00663d4e AK |
889 | if ((param.size & ~IOMMU_PAGE_MASK(tbl)) || |
890 | (param.vaddr & ~IOMMU_PAGE_MASK(tbl))) | |
5ffd229c AK |
891 | return -EINVAL; |
892 | ||
893 | /* iova is checked by the IOMMU API */ | |
05c6cfb9 AK |
894 | if (param.flags & VFIO_DMA_MAP_FLAG_READ) { |
895 | if (param.flags & VFIO_DMA_MAP_FLAG_WRITE) | |
896 | direction = DMA_BIDIRECTIONAL; | |
897 | else | |
898 | direction = DMA_TO_DEVICE; | |
899 | } else { | |
900 | if (param.flags & VFIO_DMA_MAP_FLAG_WRITE) | |
901 | direction = DMA_FROM_DEVICE; | |
902 | else | |
903 | return -EINVAL; | |
904 | } | |
5ffd229c | 905 | |
05c6cfb9 | 906 | ret = iommu_tce_put_param_check(tbl, param.iova, param.vaddr); |
5ffd229c AK |
907 | if (ret) |
908 | return ret; | |
909 | ||
2157e7b8 AK |
910 | if (container->v2) |
911 | ret = tce_iommu_build_v2(container, tbl, | |
912 | param.iova >> tbl->it_page_shift, | |
913 | param.vaddr, | |
914 | param.size >> tbl->it_page_shift, | |
915 | direction); | |
916 | else | |
917 | ret = tce_iommu_build(container, tbl, | |
918 | param.iova >> tbl->it_page_shift, | |
919 | param.vaddr, | |
920 | param.size >> tbl->it_page_shift, | |
921 | direction); | |
5ffd229c AK |
922 | |
923 | iommu_flush_tce(tbl); | |
924 | ||
925 | return ret; | |
926 | } | |
927 | case VFIO_IOMMU_UNMAP_DMA: { | |
928 | struct vfio_iommu_type1_dma_unmap param; | |
0eaf4def AK |
929 | struct iommu_table *tbl = NULL; |
930 | long num; | |
5ffd229c | 931 | |
3c56e822 AK |
932 | if (!container->enabled) |
933 | return -EPERM; | |
934 | ||
5ffd229c AK |
935 | minsz = offsetofend(struct vfio_iommu_type1_dma_unmap, |
936 | size); | |
937 | ||
938 | if (copy_from_user(¶m, (void __user *)arg, minsz)) | |
939 | return -EFAULT; | |
940 | ||
941 | if (param.argsz < minsz) | |
942 | return -EINVAL; | |
943 | ||
944 | /* No flag is supported now */ | |
945 | if (param.flags) | |
946 | return -EINVAL; | |
947 | ||
d9c72894 AK |
948 | ret = tce_iommu_create_default_window(container); |
949 | if (ret) | |
950 | return ret; | |
951 | ||
0eaf4def AK |
952 | num = tce_iommu_find_table(container, param.iova, &tbl); |
953 | if (num < 0) | |
954 | return -ENXIO; | |
955 | ||
00663d4e | 956 | if (param.size & ~IOMMU_PAGE_MASK(tbl)) |
5ffd229c AK |
957 | return -EINVAL; |
958 | ||
959 | ret = iommu_tce_clear_param_check(tbl, param.iova, 0, | |
00663d4e | 960 | param.size >> tbl->it_page_shift); |
5ffd229c AK |
961 | if (ret) |
962 | return ret; | |
963 | ||
9b14a1ff | 964 | ret = tce_iommu_clear(container, tbl, |
00663d4e AK |
965 | param.iova >> tbl->it_page_shift, |
966 | param.size >> tbl->it_page_shift); | |
5ffd229c AK |
967 | iommu_flush_tce(tbl); |
968 | ||
969 | return ret; | |
970 | } | |
2157e7b8 AK |
971 | case VFIO_IOMMU_SPAPR_REGISTER_MEMORY: { |
972 | struct vfio_iommu_spapr_register_memory param; | |
973 | ||
974 | if (!container->v2) | |
975 | break; | |
976 | ||
977 | minsz = offsetofend(struct vfio_iommu_spapr_register_memory, | |
978 | size); | |
979 | ||
bc82d122 AK |
980 | ret = tce_iommu_mm_set(container); |
981 | if (ret) | |
982 | return ret; | |
983 | ||
2157e7b8 AK |
984 | if (copy_from_user(¶m, (void __user *)arg, minsz)) |
985 | return -EFAULT; | |
986 | ||
987 | if (param.argsz < minsz) | |
988 | return -EINVAL; | |
989 | ||
990 | /* No flag is supported now */ | |
991 | if (param.flags) | |
992 | return -EINVAL; | |
993 | ||
994 | mutex_lock(&container->lock); | |
995 | ret = tce_iommu_register_pages(container, param.vaddr, | |
996 | param.size); | |
997 | mutex_unlock(&container->lock); | |
998 | ||
999 | return ret; | |
1000 | } | |
1001 | case VFIO_IOMMU_SPAPR_UNREGISTER_MEMORY: { | |
1002 | struct vfio_iommu_spapr_register_memory param; | |
1003 | ||
1004 | if (!container->v2) | |
1005 | break; | |
1006 | ||
bc82d122 AK |
1007 | if (!container->mm) |
1008 | return -EPERM; | |
1009 | ||
2157e7b8 AK |
1010 | minsz = offsetofend(struct vfio_iommu_spapr_register_memory, |
1011 | size); | |
1012 | ||
1013 | if (copy_from_user(¶m, (void __user *)arg, minsz)) | |
1014 | return -EFAULT; | |
1015 | ||
1016 | if (param.argsz < minsz) | |
1017 | return -EINVAL; | |
1018 | ||
1019 | /* No flag is supported now */ | |
1020 | if (param.flags) | |
1021 | return -EINVAL; | |
1022 | ||
1023 | mutex_lock(&container->lock); | |
1024 | ret = tce_iommu_unregister_pages(container, param.vaddr, | |
1025 | param.size); | |
1026 | mutex_unlock(&container->lock); | |
1027 | ||
1028 | return ret; | |
1029 | } | |
5ffd229c | 1030 | case VFIO_IOMMU_ENABLE: |
2157e7b8 AK |
1031 | if (container->v2) |
1032 | break; | |
1033 | ||
5ffd229c AK |
1034 | mutex_lock(&container->lock); |
1035 | ret = tce_iommu_enable(container); | |
1036 | mutex_unlock(&container->lock); | |
1037 | return ret; | |
1038 | ||
1039 | ||
1040 | case VFIO_IOMMU_DISABLE: | |
2157e7b8 AK |
1041 | if (container->v2) |
1042 | break; | |
1043 | ||
5ffd229c AK |
1044 | mutex_lock(&container->lock); |
1045 | tce_iommu_disable(container); | |
1046 | mutex_unlock(&container->lock); | |
1047 | return 0; | |
1b69be5e | 1048 | |
2157e7b8 AK |
1049 | case VFIO_EEH_PE_OP: { |
1050 | struct tce_iommu_group *tcegrp; | |
1051 | ||
1052 | ret = 0; | |
1053 | list_for_each_entry(tcegrp, &container->group_list, next) { | |
1054 | ret = vfio_spapr_iommu_eeh_ioctl(tcegrp->grp, | |
1055 | cmd, arg); | |
1056 | if (ret) | |
1057 | return ret; | |
1058 | } | |
1059 | return ret; | |
1060 | } | |
1061 | ||
e633bc86 AK |
1062 | case VFIO_IOMMU_SPAPR_TCE_CREATE: { |
1063 | struct vfio_iommu_spapr_tce_create create; | |
1064 | ||
1065 | if (!container->v2) | |
1066 | break; | |
1067 | ||
bc82d122 AK |
1068 | ret = tce_iommu_mm_set(container); |
1069 | if (ret) | |
1070 | return ret; | |
1071 | ||
e633bc86 AK |
1072 | if (!tce_groups_attached(container)) |
1073 | return -ENXIO; | |
1074 | ||
1075 | minsz = offsetofend(struct vfio_iommu_spapr_tce_create, | |
1076 | start_addr); | |
1077 | ||
1078 | if (copy_from_user(&create, (void __user *)arg, minsz)) | |
1079 | return -EFAULT; | |
1080 | ||
1081 | if (create.argsz < minsz) | |
1082 | return -EINVAL; | |
1083 | ||
1084 | if (create.flags) | |
1085 | return -EINVAL; | |
1086 | ||
1087 | mutex_lock(&container->lock); | |
1088 | ||
d9c72894 | 1089 | ret = tce_iommu_create_default_window(container); |
2da64d20 AK |
1090 | if (!ret) |
1091 | ret = tce_iommu_create_window(container, | |
1092 | create.page_shift, | |
1093 | create.window_size, create.levels, | |
1094 | &create.start_addr); | |
e633bc86 AK |
1095 | |
1096 | mutex_unlock(&container->lock); | |
1097 | ||
1098 | if (!ret && copy_to_user((void __user *)arg, &create, minsz)) | |
1099 | ret = -EFAULT; | |
1100 | ||
1101 | return ret; | |
1102 | } | |
1103 | case VFIO_IOMMU_SPAPR_TCE_REMOVE: { | |
1104 | struct vfio_iommu_spapr_tce_remove remove; | |
1105 | ||
1106 | if (!container->v2) | |
1107 | break; | |
1108 | ||
bc82d122 AK |
1109 | ret = tce_iommu_mm_set(container); |
1110 | if (ret) | |
1111 | return ret; | |
1112 | ||
e633bc86 AK |
1113 | if (!tce_groups_attached(container)) |
1114 | return -ENXIO; | |
1115 | ||
1116 | minsz = offsetofend(struct vfio_iommu_spapr_tce_remove, | |
1117 | start_addr); | |
1118 | ||
1119 | if (copy_from_user(&remove, (void __user *)arg, minsz)) | |
1120 | return -EFAULT; | |
1121 | ||
1122 | if (remove.argsz < minsz) | |
1123 | return -EINVAL; | |
1124 | ||
1125 | if (remove.flags) | |
1126 | return -EINVAL; | |
1127 | ||
d9c72894 AK |
1128 | if (container->def_window_pending && !remove.start_addr) { |
1129 | container->def_window_pending = false; | |
1130 | return 0; | |
1131 | } | |
1132 | ||
e633bc86 AK |
1133 | mutex_lock(&container->lock); |
1134 | ||
1135 | ret = tce_iommu_remove_window(container, remove.start_addr); | |
1136 | ||
1137 | mutex_unlock(&container->lock); | |
1138 | ||
1139 | return ret; | |
1140 | } | |
5ffd229c AK |
1141 | } |
1142 | ||
1143 | return -ENOTTY; | |
1144 | } | |
1145 | ||
f87a8864 AK |
1146 | static void tce_iommu_release_ownership(struct tce_container *container, |
1147 | struct iommu_table_group *table_group) | |
1148 | { | |
1149 | int i; | |
1150 | ||
1151 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { | |
2157e7b8 | 1152 | struct iommu_table *tbl = container->tables[i]; |
f87a8864 AK |
1153 | |
1154 | if (!tbl) | |
1155 | continue; | |
1156 | ||
1157 | tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size); | |
1158 | if (tbl->it_map) | |
1159 | iommu_release_ownership(tbl); | |
2157e7b8 AK |
1160 | |
1161 | container->tables[i] = NULL; | |
f87a8864 AK |
1162 | } |
1163 | } | |
1164 | ||
1165 | static int tce_iommu_take_ownership(struct tce_container *container, | |
1166 | struct iommu_table_group *table_group) | |
1167 | { | |
1168 | int i, j, rc = 0; | |
1169 | ||
1170 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { | |
1171 | struct iommu_table *tbl = table_group->tables[i]; | |
1172 | ||
1173 | if (!tbl || !tbl->it_map) | |
1174 | continue; | |
1175 | ||
39701e56 | 1176 | rc = iommu_take_ownership(tbl); |
f87a8864 AK |
1177 | if (rc) { |
1178 | for (j = 0; j < i; ++j) | |
1179 | iommu_release_ownership( | |
1180 | table_group->tables[j]); | |
1181 | ||
1182 | return rc; | |
1183 | } | |
1184 | } | |
1185 | ||
2157e7b8 AK |
1186 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) |
1187 | container->tables[i] = table_group->tables[i]; | |
1188 | ||
f87a8864 AK |
1189 | return 0; |
1190 | } | |
1191 | ||
1192 | static void tce_iommu_release_ownership_ddw(struct tce_container *container, | |
1193 | struct iommu_table_group *table_group) | |
1194 | { | |
46d3e1e1 AK |
1195 | long i; |
1196 | ||
1197 | if (!table_group->ops->unset_window) { | |
1198 | WARN_ON_ONCE(1); | |
1199 | return; | |
1200 | } | |
1201 | ||
2157e7b8 | 1202 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) |
46d3e1e1 | 1203 | table_group->ops->unset_window(table_group, i); |
46d3e1e1 | 1204 | |
f87a8864 AK |
1205 | table_group->ops->release_ownership(table_group); |
1206 | } | |
1207 | ||
1208 | static long tce_iommu_take_ownership_ddw(struct tce_container *container, | |
1209 | struct iommu_table_group *table_group) | |
1210 | { | |
930a42de AK |
1211 | long i, ret = 0; |
1212 | ||
46d3e1e1 AK |
1213 | if (!table_group->ops->create_table || !table_group->ops->set_window || |
1214 | !table_group->ops->release_ownership) { | |
1215 | WARN_ON_ONCE(1); | |
1216 | return -EFAULT; | |
1217 | } | |
1218 | ||
f87a8864 AK |
1219 | table_group->ops->take_ownership(table_group); |
1220 | ||
930a42de AK |
1221 | /* Set all windows to the new group */ |
1222 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { | |
1223 | struct iommu_table *tbl = container->tables[i]; | |
1224 | ||
1225 | if (!tbl) | |
1226 | continue; | |
1227 | ||
1228 | ret = table_group->ops->set_window(table_group, i, tbl); | |
1229 | if (ret) | |
1230 | goto release_exit; | |
1231 | } | |
1232 | ||
2157e7b8 | 1233 | return 0; |
930a42de AK |
1234 | |
1235 | release_exit: | |
1236 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) | |
1237 | table_group->ops->unset_window(table_group, i); | |
1238 | ||
1239 | table_group->ops->release_ownership(table_group); | |
1240 | ||
1241 | return ret; | |
f87a8864 AK |
1242 | } |
1243 | ||
5ffd229c AK |
1244 | static int tce_iommu_attach_group(void *iommu_data, |
1245 | struct iommu_group *iommu_group) | |
1246 | { | |
1247 | int ret; | |
1248 | struct tce_container *container = iommu_data; | |
0eaf4def | 1249 | struct iommu_table_group *table_group; |
2157e7b8 | 1250 | struct tce_iommu_group *tcegrp = NULL; |
5ffd229c | 1251 | |
5ffd229c AK |
1252 | mutex_lock(&container->lock); |
1253 | ||
1254 | /* pr_debug("tce_vfio: Attaching group #%u to iommu %p\n", | |
1255 | iommu_group_id(iommu_group), iommu_group); */ | |
2157e7b8 | 1256 | table_group = iommu_group_get_iommudata(iommu_group); |
bd00fdf1 GK |
1257 | if (!table_group) { |
1258 | ret = -ENODEV; | |
1259 | goto unlock_exit; | |
1260 | } | |
2157e7b8 AK |
1261 | |
1262 | if (tce_groups_attached(container) && (!table_group->ops || | |
1263 | !table_group->ops->take_ownership || | |
1264 | !table_group->ops->release_ownership)) { | |
5ffd229c | 1265 | ret = -EBUSY; |
22af4859 AK |
1266 | goto unlock_exit; |
1267 | } | |
1268 | ||
2157e7b8 AK |
1269 | /* Check if new group has the same iommu_ops (i.e. compatible) */ |
1270 | list_for_each_entry(tcegrp, &container->group_list, next) { | |
1271 | struct iommu_table_group *table_group_tmp; | |
1272 | ||
1273 | if (tcegrp->grp == iommu_group) { | |
1274 | pr_warn("tce_vfio: Group %d is already attached\n", | |
1275 | iommu_group_id(iommu_group)); | |
1276 | ret = -EBUSY; | |
1277 | goto unlock_exit; | |
1278 | } | |
1279 | table_group_tmp = iommu_group_get_iommudata(tcegrp->grp); | |
54de285b AK |
1280 | if (table_group_tmp->ops->create_table != |
1281 | table_group->ops->create_table) { | |
2157e7b8 AK |
1282 | pr_warn("tce_vfio: Group %d is incompatible with group %d\n", |
1283 | iommu_group_id(iommu_group), | |
1284 | iommu_group_id(tcegrp->grp)); | |
1285 | ret = -EPERM; | |
1286 | goto unlock_exit; | |
1287 | } | |
5ffd229c AK |
1288 | } |
1289 | ||
2157e7b8 AK |
1290 | tcegrp = kzalloc(sizeof(*tcegrp), GFP_KERNEL); |
1291 | if (!tcegrp) { | |
1292 | ret = -ENOMEM; | |
0eaf4def AK |
1293 | goto unlock_exit; |
1294 | } | |
1295 | ||
f87a8864 | 1296 | if (!table_group->ops || !table_group->ops->take_ownership || |
6f01cc69 | 1297 | !table_group->ops->release_ownership) { |
1282ba7f AK |
1298 | if (container->v2) { |
1299 | ret = -EPERM; | |
1300 | goto unlock_exit; | |
1301 | } | |
f87a8864 | 1302 | ret = tce_iommu_take_ownership(container, table_group); |
6f01cc69 | 1303 | } else { |
1282ba7f AK |
1304 | if (!container->v2) { |
1305 | ret = -EPERM; | |
1306 | goto unlock_exit; | |
1307 | } | |
f87a8864 | 1308 | ret = tce_iommu_take_ownership_ddw(container, table_group); |
6f01cc69 | 1309 | if (!tce_groups_attached(container) && !container->tables[0]) |
d9c72894 | 1310 | container->def_window_pending = true; |
6f01cc69 | 1311 | } |
f87a8864 | 1312 | |
2157e7b8 AK |
1313 | if (!ret) { |
1314 | tcegrp->grp = iommu_group; | |
1315 | list_add(&tcegrp->next, &container->group_list); | |
1316 | } | |
22af4859 AK |
1317 | |
1318 | unlock_exit: | |
2157e7b8 AK |
1319 | if (ret && tcegrp) |
1320 | kfree(tcegrp); | |
1321 | ||
5ffd229c AK |
1322 | mutex_unlock(&container->lock); |
1323 | ||
1324 | return ret; | |
1325 | } | |
1326 | ||
1327 | static void tce_iommu_detach_group(void *iommu_data, | |
1328 | struct iommu_group *iommu_group) | |
1329 | { | |
1330 | struct tce_container *container = iommu_data; | |
0eaf4def | 1331 | struct iommu_table_group *table_group; |
2157e7b8 AK |
1332 | bool found = false; |
1333 | struct tce_iommu_group *tcegrp; | |
5ffd229c | 1334 | |
5ffd229c | 1335 | mutex_lock(&container->lock); |
2157e7b8 AK |
1336 | |
1337 | list_for_each_entry(tcegrp, &container->group_list, next) { | |
1338 | if (tcegrp->grp == iommu_group) { | |
1339 | found = true; | |
1340 | break; | |
1341 | } | |
22af4859 | 1342 | } |
5ffd229c | 1343 | |
2157e7b8 AK |
1344 | if (!found) { |
1345 | pr_warn("tce_vfio: detaching unattached group #%u\n", | |
1346 | iommu_group_id(iommu_group)); | |
1347 | goto unlock_exit; | |
5ffd229c | 1348 | } |
22af4859 | 1349 | |
2157e7b8 AK |
1350 | list_del(&tcegrp->next); |
1351 | kfree(tcegrp); | |
0eaf4def AK |
1352 | |
1353 | table_group = iommu_group_get_iommudata(iommu_group); | |
1354 | BUG_ON(!table_group); | |
1355 | ||
f87a8864 AK |
1356 | if (!table_group->ops || !table_group->ops->release_ownership) |
1357 | tce_iommu_release_ownership(container, table_group); | |
1358 | else | |
1359 | tce_iommu_release_ownership_ddw(container, table_group); | |
22af4859 AK |
1360 | |
1361 | unlock_exit: | |
5ffd229c AK |
1362 | mutex_unlock(&container->lock); |
1363 | } | |
1364 | ||
1365 | const struct vfio_iommu_driver_ops tce_iommu_driver_ops = { | |
1366 | .name = "iommu-vfio-powerpc", | |
1367 | .owner = THIS_MODULE, | |
1368 | .open = tce_iommu_open, | |
1369 | .release = tce_iommu_release, | |
1370 | .ioctl = tce_iommu_ioctl, | |
1371 | .attach_group = tce_iommu_attach_group, | |
1372 | .detach_group = tce_iommu_detach_group, | |
1373 | }; | |
1374 | ||
1375 | static int __init tce_iommu_init(void) | |
1376 | { | |
1377 | return vfio_register_iommu_driver(&tce_iommu_driver_ops); | |
1378 | } | |
1379 | ||
1380 | static void __exit tce_iommu_cleanup(void) | |
1381 | { | |
1382 | vfio_unregister_iommu_driver(&tce_iommu_driver_ops); | |
1383 | } | |
1384 | ||
1385 | module_init(tce_iommu_init); | |
1386 | module_exit(tce_iommu_cleanup); | |
1387 | ||
1388 | MODULE_VERSION(DRIVER_VERSION); | |
1389 | MODULE_LICENSE("GPL v2"); | |
1390 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
1391 | MODULE_DESCRIPTION(DRIVER_DESC); | |
1392 |