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 | ||
bc82d122 AK |
214 | static long tce_iommu_userspace_view_alloc(struct iommu_table *tbl, |
215 | struct mm_struct *mm) | |
2157e7b8 AK |
216 | { |
217 | unsigned long cb = _ALIGN_UP(sizeof(tbl->it_userspace[0]) * | |
218 | tbl->it_size, PAGE_SIZE); | |
219 | unsigned long *uas; | |
220 | long ret; | |
221 | ||
222 | BUG_ON(tbl->it_userspace); | |
223 | ||
bc82d122 | 224 | ret = try_increment_locked_vm(mm, cb >> PAGE_SHIFT); |
2157e7b8 AK |
225 | if (ret) |
226 | return ret; | |
227 | ||
228 | uas = vzalloc(cb); | |
229 | if (!uas) { | |
bc82d122 | 230 | decrement_locked_vm(mm, cb >> PAGE_SHIFT); |
2157e7b8 AK |
231 | return -ENOMEM; |
232 | } | |
233 | tbl->it_userspace = uas; | |
234 | ||
235 | return 0; | |
236 | } | |
237 | ||
bc82d122 AK |
238 | static void tce_iommu_userspace_view_free(struct iommu_table *tbl, |
239 | struct mm_struct *mm) | |
2157e7b8 AK |
240 | { |
241 | unsigned long cb = _ALIGN_UP(sizeof(tbl->it_userspace[0]) * | |
242 | tbl->it_size, PAGE_SIZE); | |
243 | ||
244 | if (!tbl->it_userspace) | |
245 | return; | |
246 | ||
247 | vfree(tbl->it_userspace); | |
248 | tbl->it_userspace = NULL; | |
bc82d122 | 249 | decrement_locked_vm(mm, cb >> PAGE_SHIFT); |
2157e7b8 AK |
250 | } |
251 | ||
e432bc7e AK |
252 | static bool tce_page_is_contained(struct page *page, unsigned page_shift) |
253 | { | |
254 | /* | |
255 | * Check that the TCE table granularity is not bigger than the size of | |
256 | * a page we just found. Otherwise the hardware can get access to | |
257 | * a bigger memory chunk that it should. | |
258 | */ | |
259 | return (PAGE_SHIFT + compound_order(compound_head(page))) >= page_shift; | |
260 | } | |
261 | ||
2157e7b8 AK |
262 | static inline bool tce_groups_attached(struct tce_container *container) |
263 | { | |
264 | return !list_empty(&container->group_list); | |
265 | } | |
266 | ||
0eaf4def AK |
267 | static long tce_iommu_find_table(struct tce_container *container, |
268 | phys_addr_t ioba, struct iommu_table **ptbl) | |
269 | { | |
270 | long i; | |
0eaf4def AK |
271 | |
272 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { | |
2157e7b8 | 273 | struct iommu_table *tbl = container->tables[i]; |
0eaf4def AK |
274 | |
275 | if (tbl) { | |
276 | unsigned long entry = ioba >> tbl->it_page_shift; | |
277 | unsigned long start = tbl->it_offset; | |
278 | unsigned long end = start + tbl->it_size; | |
279 | ||
280 | if ((start <= entry) && (entry < end)) { | |
281 | *ptbl = tbl; | |
282 | return i; | |
283 | } | |
284 | } | |
285 | } | |
286 | ||
287 | return -1; | |
288 | } | |
289 | ||
e633bc86 AK |
290 | static int tce_iommu_find_free_table(struct tce_container *container) |
291 | { | |
292 | int i; | |
293 | ||
294 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { | |
295 | if (!container->tables[i]) | |
296 | return i; | |
297 | } | |
298 | ||
299 | return -ENOSPC; | |
300 | } | |
301 | ||
5ffd229c AK |
302 | static int tce_iommu_enable(struct tce_container *container) |
303 | { | |
304 | int ret = 0; | |
2d270df8 | 305 | unsigned long locked; |
0eaf4def | 306 | struct iommu_table_group *table_group; |
2157e7b8 | 307 | struct tce_iommu_group *tcegrp; |
5ffd229c | 308 | |
5ffd229c AK |
309 | if (container->enabled) |
310 | return -EBUSY; | |
311 | ||
312 | /* | |
313 | * When userspace pages are mapped into the IOMMU, they are effectively | |
314 | * locked memory, so, theoretically, we need to update the accounting | |
315 | * of locked pages on each map and unmap. For powerpc, the map unmap | |
316 | * paths can be very hot, though, and the accounting would kill | |
317 | * performance, especially since it would be difficult to impossible | |
318 | * to handle the accounting in real mode only. | |
319 | * | |
320 | * To address that, rather than precisely accounting every page, we | |
321 | * instead account for a worst case on locked memory when the iommu is | |
322 | * enabled and disabled. The worst case upper bound on locked memory | |
323 | * is the size of the whole iommu window, which is usually relatively | |
324 | * small (compared to total memory sizes) on POWER hardware. | |
325 | * | |
326 | * Also we don't have a nice way to fail on H_PUT_TCE due to ulimits, | |
327 | * that would effectively kill the guest at random points, much better | |
328 | * enforcing the limit based on the max that the guest can map. | |
2d270df8 AK |
329 | * |
330 | * Unfortunately at the moment it counts whole tables, no matter how | |
331 | * much memory the guest has. I.e. for 4GB guest and 4 IOMMU groups | |
332 | * each with 2GB DMA window, 8GB will be counted here. The reason for | |
333 | * this is that we cannot tell here the amount of RAM used by the guest | |
334 | * as this information is only available from KVM and VFIO is | |
335 | * KVM agnostic. | |
4793d65d AK |
336 | * |
337 | * So we do not allow enabling a container without a group attached | |
338 | * as there is no way to know how much we should increment | |
339 | * the locked_vm counter. | |
5ffd229c | 340 | */ |
2157e7b8 AK |
341 | if (!tce_groups_attached(container)) |
342 | return -ENODEV; | |
343 | ||
344 | tcegrp = list_first_entry(&container->group_list, | |
345 | struct tce_iommu_group, next); | |
346 | table_group = iommu_group_get_iommudata(tcegrp->grp); | |
0eaf4def AK |
347 | if (!table_group) |
348 | return -ENODEV; | |
349 | ||
4793d65d AK |
350 | if (!table_group->tce32_size) |
351 | return -EPERM; | |
352 | ||
bc82d122 AK |
353 | ret = tce_iommu_mm_set(container); |
354 | if (ret) | |
355 | return ret; | |
356 | ||
4793d65d | 357 | locked = table_group->tce32_size >> PAGE_SHIFT; |
bc82d122 | 358 | ret = try_increment_locked_vm(container->mm, locked); |
2d270df8 AK |
359 | if (ret) |
360 | return ret; | |
5ffd229c | 361 | |
2d270df8 AK |
362 | container->locked_pages = locked; |
363 | ||
364 | container->enabled = true; | |
5ffd229c AK |
365 | |
366 | return ret; | |
367 | } | |
368 | ||
369 | static void tce_iommu_disable(struct tce_container *container) | |
370 | { | |
371 | if (!container->enabled) | |
372 | return; | |
373 | ||
374 | container->enabled = false; | |
375 | ||
bc82d122 AK |
376 | BUG_ON(!container->mm); |
377 | decrement_locked_vm(container->mm, container->locked_pages); | |
5ffd229c AK |
378 | } |
379 | ||
380 | static void *tce_iommu_open(unsigned long arg) | |
381 | { | |
382 | struct tce_container *container; | |
383 | ||
2157e7b8 | 384 | if ((arg != VFIO_SPAPR_TCE_IOMMU) && (arg != VFIO_SPAPR_TCE_v2_IOMMU)) { |
5ffd229c AK |
385 | pr_err("tce_vfio: Wrong IOMMU type\n"); |
386 | return ERR_PTR(-EINVAL); | |
387 | } | |
388 | ||
389 | container = kzalloc(sizeof(*container), GFP_KERNEL); | |
390 | if (!container) | |
391 | return ERR_PTR(-ENOMEM); | |
392 | ||
393 | mutex_init(&container->lock); | |
2157e7b8 | 394 | INIT_LIST_HEAD_RCU(&container->group_list); |
4b6fad70 | 395 | INIT_LIST_HEAD_RCU(&container->prereg_list); |
2157e7b8 AK |
396 | |
397 | container->v2 = arg == VFIO_SPAPR_TCE_v2_IOMMU; | |
5ffd229c AK |
398 | |
399 | return container; | |
400 | } | |
401 | ||
2157e7b8 AK |
402 | static int tce_iommu_clear(struct tce_container *container, |
403 | struct iommu_table *tbl, | |
404 | unsigned long entry, unsigned long pages); | |
bc82d122 AK |
405 | static void tce_iommu_free_table(struct tce_container *container, |
406 | struct iommu_table *tbl); | |
2157e7b8 | 407 | |
5ffd229c AK |
408 | static void tce_iommu_release(void *iommu_data) |
409 | { | |
410 | struct tce_container *container = iommu_data; | |
2157e7b8 AK |
411 | struct tce_iommu_group *tcegrp; |
412 | long i; | |
5ffd229c | 413 | |
2157e7b8 AK |
414 | while (tce_groups_attached(container)) { |
415 | tcegrp = list_first_entry(&container->group_list, | |
416 | struct tce_iommu_group, next); | |
2157e7b8 AK |
417 | tce_iommu_detach_group(iommu_data, tcegrp->grp); |
418 | } | |
5ffd229c | 419 | |
2157e7b8 AK |
420 | /* |
421 | * If VFIO created a table, it was not disposed | |
422 | * by tce_iommu_detach_group() so do it now. | |
423 | */ | |
424 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { | |
425 | struct iommu_table *tbl = container->tables[i]; | |
426 | ||
427 | if (!tbl) | |
428 | continue; | |
429 | ||
430 | tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size); | |
bc82d122 | 431 | tce_iommu_free_table(container, tbl); |
2157e7b8 | 432 | } |
5ffd229c | 433 | |
4b6fad70 AK |
434 | while (!list_empty(&container->prereg_list)) { |
435 | struct tce_iommu_prereg *tcemem; | |
436 | ||
437 | tcemem = list_first_entry(&container->prereg_list, | |
438 | struct tce_iommu_prereg, next); | |
439 | WARN_ON_ONCE(tce_iommu_prereg_free(container, tcemem)); | |
440 | } | |
441 | ||
649354b7 | 442 | tce_iommu_disable(container); |
bc82d122 AK |
443 | if (container->mm) |
444 | mmdrop(container->mm); | |
5ffd229c AK |
445 | mutex_destroy(&container->lock); |
446 | ||
447 | kfree(container); | |
448 | } | |
449 | ||
649354b7 | 450 | static void tce_iommu_unuse_page(struct tce_container *container, |
05c6cfb9 | 451 | unsigned long hpa) |
649354b7 AK |
452 | { |
453 | struct page *page; | |
454 | ||
05c6cfb9 | 455 | page = pfn_to_page(hpa >> PAGE_SHIFT); |
649354b7 AK |
456 | put_page(page); |
457 | } | |
458 | ||
bc82d122 AK |
459 | static int tce_iommu_prereg_ua_to_hpa(struct tce_container *container, |
460 | unsigned long tce, unsigned long size, | |
2157e7b8 AK |
461 | unsigned long *phpa, struct mm_iommu_table_group_mem_t **pmem) |
462 | { | |
463 | long ret = 0; | |
464 | struct mm_iommu_table_group_mem_t *mem; | |
465 | ||
bc82d122 | 466 | mem = mm_iommu_lookup(container->mm, tce, size); |
2157e7b8 AK |
467 | if (!mem) |
468 | return -EINVAL; | |
469 | ||
470 | ret = mm_iommu_ua_to_hpa(mem, tce, phpa); | |
471 | if (ret) | |
472 | return -EINVAL; | |
473 | ||
474 | *pmem = mem; | |
475 | ||
476 | return 0; | |
477 | } | |
478 | ||
bc82d122 AK |
479 | static void tce_iommu_unuse_page_v2(struct tce_container *container, |
480 | struct iommu_table *tbl, unsigned long entry) | |
2157e7b8 AK |
481 | { |
482 | struct mm_iommu_table_group_mem_t *mem = NULL; | |
483 | int ret; | |
484 | unsigned long hpa = 0; | |
485 | unsigned long *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl, entry); | |
486 | ||
bc82d122 | 487 | if (!pua) |
2157e7b8 AK |
488 | return; |
489 | ||
bc82d122 | 490 | ret = tce_iommu_prereg_ua_to_hpa(container, *pua, IOMMU_PAGE_SIZE(tbl), |
2157e7b8 AK |
491 | &hpa, &mem); |
492 | if (ret) | |
493 | pr_debug("%s: tce %lx at #%lx was not cached, ret=%d\n", | |
494 | __func__, *pua, entry, ret); | |
495 | if (mem) | |
496 | mm_iommu_mapped_dec(mem); | |
497 | ||
498 | *pua = 0; | |
499 | } | |
500 | ||
9b14a1ff AK |
501 | static int tce_iommu_clear(struct tce_container *container, |
502 | struct iommu_table *tbl, | |
503 | unsigned long entry, unsigned long pages) | |
504 | { | |
05c6cfb9 AK |
505 | unsigned long oldhpa; |
506 | long ret; | |
507 | enum dma_data_direction direction; | |
9b14a1ff AK |
508 | |
509 | for ( ; pages; --pages, ++entry) { | |
05c6cfb9 AK |
510 | direction = DMA_NONE; |
511 | oldhpa = 0; | |
512 | ret = iommu_tce_xchg(tbl, entry, &oldhpa, &direction); | |
513 | if (ret) | |
514 | continue; | |
515 | ||
516 | if (direction == DMA_NONE) | |
9b14a1ff AK |
517 | continue; |
518 | ||
2157e7b8 | 519 | if (container->v2) { |
bc82d122 | 520 | tce_iommu_unuse_page_v2(container, tbl, entry); |
2157e7b8 AK |
521 | continue; |
522 | } | |
523 | ||
05c6cfb9 | 524 | tce_iommu_unuse_page(container, oldhpa); |
9b14a1ff AK |
525 | } |
526 | ||
527 | return 0; | |
528 | } | |
529 | ||
649354b7 AK |
530 | static int tce_iommu_use_page(unsigned long tce, unsigned long *hpa) |
531 | { | |
532 | struct page *page = NULL; | |
533 | enum dma_data_direction direction = iommu_tce_direction(tce); | |
534 | ||
535 | if (get_user_pages_fast(tce & PAGE_MASK, 1, | |
536 | direction != DMA_TO_DEVICE, &page) != 1) | |
537 | return -EFAULT; | |
538 | ||
539 | *hpa = __pa((unsigned long) page_address(page)); | |
540 | ||
541 | return 0; | |
542 | } | |
543 | ||
9b14a1ff AK |
544 | static long tce_iommu_build(struct tce_container *container, |
545 | struct iommu_table *tbl, | |
05c6cfb9 AK |
546 | unsigned long entry, unsigned long tce, unsigned long pages, |
547 | enum dma_data_direction direction) | |
9b14a1ff AK |
548 | { |
549 | long i, ret = 0; | |
649354b7 AK |
550 | struct page *page; |
551 | unsigned long hpa; | |
05c6cfb9 | 552 | enum dma_data_direction dirtmp; |
9b14a1ff AK |
553 | |
554 | for (i = 0; i < pages; ++i) { | |
555 | unsigned long offset = tce & IOMMU_PAGE_MASK(tbl) & ~PAGE_MASK; | |
556 | ||
649354b7 AK |
557 | ret = tce_iommu_use_page(tce, &hpa); |
558 | if (ret) | |
9b14a1ff | 559 | break; |
e432bc7e | 560 | |
649354b7 | 561 | page = pfn_to_page(hpa >> PAGE_SHIFT); |
e432bc7e AK |
562 | if (!tce_page_is_contained(page, tbl->it_page_shift)) { |
563 | ret = -EPERM; | |
564 | break; | |
565 | } | |
566 | ||
649354b7 | 567 | hpa |= offset; |
05c6cfb9 AK |
568 | dirtmp = direction; |
569 | ret = iommu_tce_xchg(tbl, entry + i, &hpa, &dirtmp); | |
9b14a1ff | 570 | if (ret) { |
649354b7 | 571 | tce_iommu_unuse_page(container, hpa); |
9b14a1ff AK |
572 | pr_err("iommu_tce: %s failed ioba=%lx, tce=%lx, ret=%ld\n", |
573 | __func__, entry << tbl->it_page_shift, | |
574 | tce, ret); | |
575 | break; | |
576 | } | |
05c6cfb9 AK |
577 | |
578 | if (dirtmp != DMA_NONE) | |
579 | tce_iommu_unuse_page(container, hpa); | |
580 | ||
00663d4e | 581 | tce += IOMMU_PAGE_SIZE(tbl); |
9b14a1ff AK |
582 | } |
583 | ||
584 | if (ret) | |
585 | tce_iommu_clear(container, tbl, entry, i); | |
586 | ||
587 | return ret; | |
588 | } | |
589 | ||
2157e7b8 AK |
590 | static long tce_iommu_build_v2(struct tce_container *container, |
591 | struct iommu_table *tbl, | |
592 | unsigned long entry, unsigned long tce, unsigned long pages, | |
593 | enum dma_data_direction direction) | |
594 | { | |
595 | long i, ret = 0; | |
596 | struct page *page; | |
597 | unsigned long hpa; | |
598 | enum dma_data_direction dirtmp; | |
599 | ||
39701e56 | 600 | if (!tbl->it_userspace) { |
bc82d122 | 601 | ret = tce_iommu_userspace_view_alloc(tbl, container->mm); |
39701e56 AK |
602 | if (ret) |
603 | return ret; | |
604 | } | |
605 | ||
2157e7b8 AK |
606 | for (i = 0; i < pages; ++i) { |
607 | struct mm_iommu_table_group_mem_t *mem = NULL; | |
608 | unsigned long *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl, | |
609 | entry + i); | |
610 | ||
bc82d122 AK |
611 | ret = tce_iommu_prereg_ua_to_hpa(container, |
612 | tce, IOMMU_PAGE_SIZE(tbl), &hpa, &mem); | |
2157e7b8 AK |
613 | if (ret) |
614 | break; | |
615 | ||
616 | page = pfn_to_page(hpa >> PAGE_SHIFT); | |
617 | if (!tce_page_is_contained(page, tbl->it_page_shift)) { | |
618 | ret = -EPERM; | |
619 | break; | |
620 | } | |
621 | ||
622 | /* Preserve offset within IOMMU page */ | |
623 | hpa |= tce & IOMMU_PAGE_MASK(tbl) & ~PAGE_MASK; | |
624 | dirtmp = direction; | |
625 | ||
626 | /* The registered region is being unregistered */ | |
627 | if (mm_iommu_mapped_inc(mem)) | |
628 | break; | |
629 | ||
630 | ret = iommu_tce_xchg(tbl, entry + i, &hpa, &dirtmp); | |
631 | if (ret) { | |
632 | /* dirtmp cannot be DMA_NONE here */ | |
bc82d122 | 633 | tce_iommu_unuse_page_v2(container, tbl, entry + i); |
2157e7b8 AK |
634 | pr_err("iommu_tce: %s failed ioba=%lx, tce=%lx, ret=%ld\n", |
635 | __func__, entry << tbl->it_page_shift, | |
636 | tce, ret); | |
637 | break; | |
638 | } | |
639 | ||
640 | if (dirtmp != DMA_NONE) | |
bc82d122 | 641 | tce_iommu_unuse_page_v2(container, tbl, entry + i); |
2157e7b8 AK |
642 | |
643 | *pua = tce; | |
644 | ||
645 | tce += IOMMU_PAGE_SIZE(tbl); | |
646 | } | |
647 | ||
648 | if (ret) | |
649 | tce_iommu_clear(container, tbl, entry, i); | |
650 | ||
651 | return ret; | |
652 | } | |
653 | ||
46d3e1e1 AK |
654 | static long tce_iommu_create_table(struct tce_container *container, |
655 | struct iommu_table_group *table_group, | |
656 | int num, | |
657 | __u32 page_shift, | |
658 | __u64 window_size, | |
659 | __u32 levels, | |
660 | struct iommu_table **ptbl) | |
661 | { | |
662 | long ret, table_size; | |
663 | ||
664 | table_size = table_group->ops->get_table_size(page_shift, window_size, | |
665 | levels); | |
666 | if (!table_size) | |
667 | return -EINVAL; | |
668 | ||
bc82d122 | 669 | ret = try_increment_locked_vm(container->mm, table_size >> PAGE_SHIFT); |
46d3e1e1 AK |
670 | if (ret) |
671 | return ret; | |
672 | ||
673 | ret = table_group->ops->create_table(table_group, num, | |
674 | page_shift, window_size, levels, ptbl); | |
675 | ||
676 | WARN_ON(!ret && !(*ptbl)->it_ops->free); | |
677 | WARN_ON(!ret && ((*ptbl)->it_allocated_size != table_size)); | |
678 | ||
46d3e1e1 AK |
679 | return ret; |
680 | } | |
681 | ||
bc82d122 AK |
682 | static void tce_iommu_free_table(struct tce_container *container, |
683 | struct iommu_table *tbl) | |
46d3e1e1 AK |
684 | { |
685 | unsigned long pages = tbl->it_allocated_size >> PAGE_SHIFT; | |
686 | ||
bc82d122 | 687 | tce_iommu_userspace_view_free(tbl, container->mm); |
46d3e1e1 | 688 | tbl->it_ops->free(tbl); |
bc82d122 | 689 | decrement_locked_vm(container->mm, pages); |
46d3e1e1 AK |
690 | } |
691 | ||
e633bc86 AK |
692 | static long tce_iommu_create_window(struct tce_container *container, |
693 | __u32 page_shift, __u64 window_size, __u32 levels, | |
694 | __u64 *start_addr) | |
695 | { | |
696 | struct tce_iommu_group *tcegrp; | |
697 | struct iommu_table_group *table_group; | |
698 | struct iommu_table *tbl = NULL; | |
699 | long ret, num; | |
700 | ||
701 | num = tce_iommu_find_free_table(container); | |
702 | if (num < 0) | |
703 | return num; | |
704 | ||
705 | /* Get the first group for ops::create_table */ | |
706 | tcegrp = list_first_entry(&container->group_list, | |
707 | struct tce_iommu_group, next); | |
708 | table_group = iommu_group_get_iommudata(tcegrp->grp); | |
709 | if (!table_group) | |
710 | return -EFAULT; | |
711 | ||
712 | if (!(table_group->pgsizes & (1ULL << page_shift))) | |
713 | return -EINVAL; | |
714 | ||
715 | if (!table_group->ops->set_window || !table_group->ops->unset_window || | |
716 | !table_group->ops->get_table_size || | |
717 | !table_group->ops->create_table) | |
718 | return -EPERM; | |
719 | ||
720 | /* Create TCE table */ | |
721 | ret = tce_iommu_create_table(container, table_group, num, | |
722 | page_shift, window_size, levels, &tbl); | |
723 | if (ret) | |
724 | return ret; | |
725 | ||
726 | BUG_ON(!tbl->it_ops->free); | |
727 | ||
728 | /* | |
729 | * Program the table to every group. | |
730 | * Groups have been tested for compatibility at the attach time. | |
731 | */ | |
732 | list_for_each_entry(tcegrp, &container->group_list, next) { | |
733 | table_group = iommu_group_get_iommudata(tcegrp->grp); | |
734 | ||
735 | ret = table_group->ops->set_window(table_group, num, tbl); | |
736 | if (ret) | |
737 | goto unset_exit; | |
738 | } | |
739 | ||
740 | container->tables[num] = tbl; | |
741 | ||
742 | /* Return start address assigned by platform in create_table() */ | |
743 | *start_addr = tbl->it_offset << tbl->it_page_shift; | |
744 | ||
745 | return 0; | |
746 | ||
747 | unset_exit: | |
748 | list_for_each_entry(tcegrp, &container->group_list, next) { | |
749 | table_group = iommu_group_get_iommudata(tcegrp->grp); | |
750 | table_group->ops->unset_window(table_group, num); | |
751 | } | |
bc82d122 | 752 | tce_iommu_free_table(container, tbl); |
e633bc86 AK |
753 | |
754 | return ret; | |
755 | } | |
756 | ||
757 | static long tce_iommu_remove_window(struct tce_container *container, | |
758 | __u64 start_addr) | |
759 | { | |
760 | struct iommu_table_group *table_group = NULL; | |
761 | struct iommu_table *tbl; | |
762 | struct tce_iommu_group *tcegrp; | |
763 | int num; | |
764 | ||
765 | num = tce_iommu_find_table(container, start_addr, &tbl); | |
766 | if (num < 0) | |
767 | return -EINVAL; | |
768 | ||
769 | BUG_ON(!tbl->it_size); | |
770 | ||
771 | /* Detach groups from IOMMUs */ | |
772 | list_for_each_entry(tcegrp, &container->group_list, next) { | |
773 | table_group = iommu_group_get_iommudata(tcegrp->grp); | |
774 | ||
775 | /* | |
776 | * SPAPR TCE IOMMU exposes the default DMA window to | |
777 | * the guest via dma32_window_start/size of | |
778 | * VFIO_IOMMU_SPAPR_TCE_GET_INFO. Some platforms allow | |
779 | * the userspace to remove this window, some do not so | |
780 | * here we check for the platform capability. | |
781 | */ | |
782 | if (!table_group->ops || !table_group->ops->unset_window) | |
783 | return -EPERM; | |
784 | ||
785 | table_group->ops->unset_window(table_group, num); | |
786 | } | |
787 | ||
788 | /* Free table */ | |
789 | tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size); | |
bc82d122 | 790 | tce_iommu_free_table(container, tbl); |
e633bc86 AK |
791 | container->tables[num] = NULL; |
792 | ||
793 | return 0; | |
794 | } | |
795 | ||
6f01cc69 AK |
796 | static long tce_iommu_create_default_window(struct tce_container *container) |
797 | { | |
798 | long ret; | |
799 | __u64 start_addr = 0; | |
800 | struct tce_iommu_group *tcegrp; | |
801 | struct iommu_table_group *table_group; | |
802 | ||
d9c72894 AK |
803 | if (!container->def_window_pending) |
804 | return 0; | |
805 | ||
6f01cc69 AK |
806 | if (!tce_groups_attached(container)) |
807 | return -ENODEV; | |
808 | ||
809 | tcegrp = list_first_entry(&container->group_list, | |
810 | struct tce_iommu_group, next); | |
811 | table_group = iommu_group_get_iommudata(tcegrp->grp); | |
812 | if (!table_group) | |
813 | return -ENODEV; | |
814 | ||
815 | ret = tce_iommu_create_window(container, IOMMU_PAGE_SHIFT_4K, | |
816 | table_group->tce32_size, 1, &start_addr); | |
817 | WARN_ON_ONCE(!ret && start_addr); | |
818 | ||
d9c72894 AK |
819 | if (!ret) |
820 | container->def_window_pending = false; | |
821 | ||
6f01cc69 AK |
822 | return ret; |
823 | } | |
824 | ||
5ffd229c AK |
825 | static long tce_iommu_ioctl(void *iommu_data, |
826 | unsigned int cmd, unsigned long arg) | |
827 | { | |
828 | struct tce_container *container = iommu_data; | |
e633bc86 | 829 | unsigned long minsz, ddwsz; |
5ffd229c AK |
830 | long ret; |
831 | ||
832 | switch (cmd) { | |
833 | case VFIO_CHECK_EXTENSION: | |
1b69be5e GS |
834 | switch (arg) { |
835 | case VFIO_SPAPR_TCE_IOMMU: | |
2157e7b8 | 836 | case VFIO_SPAPR_TCE_v2_IOMMU: |
1b69be5e GS |
837 | ret = 1; |
838 | break; | |
839 | default: | |
840 | ret = vfio_spapr_iommu_eeh_ioctl(NULL, cmd, arg); | |
841 | break; | |
842 | } | |
843 | ||
844 | return (ret < 0) ? 0 : ret; | |
bc82d122 AK |
845 | } |
846 | ||
847 | /* | |
848 | * Sanity check to prevent one userspace from manipulating | |
849 | * another userspace mm. | |
850 | */ | |
851 | BUG_ON(!container); | |
852 | if (container->mm && container->mm != current->mm) | |
853 | return -EPERM; | |
5ffd229c | 854 | |
bc82d122 | 855 | switch (cmd) { |
5ffd229c AK |
856 | case VFIO_IOMMU_SPAPR_TCE_GET_INFO: { |
857 | struct vfio_iommu_spapr_tce_info info; | |
2157e7b8 | 858 | struct tce_iommu_group *tcegrp; |
0eaf4def AK |
859 | struct iommu_table_group *table_group; |
860 | ||
2157e7b8 | 861 | if (!tce_groups_attached(container)) |
0eaf4def AK |
862 | return -ENXIO; |
863 | ||
2157e7b8 AK |
864 | tcegrp = list_first_entry(&container->group_list, |
865 | struct tce_iommu_group, next); | |
866 | table_group = iommu_group_get_iommudata(tcegrp->grp); | |
5ffd229c | 867 | |
4793d65d | 868 | if (!table_group) |
5ffd229c AK |
869 | return -ENXIO; |
870 | ||
871 | minsz = offsetofend(struct vfio_iommu_spapr_tce_info, | |
872 | dma32_window_size); | |
873 | ||
874 | if (copy_from_user(&info, (void __user *)arg, minsz)) | |
875 | return -EFAULT; | |
876 | ||
877 | if (info.argsz < minsz) | |
878 | return -EINVAL; | |
879 | ||
4793d65d AK |
880 | info.dma32_window_start = table_group->tce32_start; |
881 | info.dma32_window_size = table_group->tce32_size; | |
5ffd229c | 882 | info.flags = 0; |
e633bc86 AK |
883 | memset(&info.ddw, 0, sizeof(info.ddw)); |
884 | ||
885 | if (table_group->max_dynamic_windows_supported && | |
886 | container->v2) { | |
887 | info.flags |= VFIO_IOMMU_SPAPR_INFO_DDW; | |
888 | info.ddw.pgsizes = table_group->pgsizes; | |
889 | info.ddw.max_dynamic_windows_supported = | |
890 | table_group->max_dynamic_windows_supported; | |
891 | info.ddw.levels = table_group->max_levels; | |
892 | } | |
893 | ||
894 | ddwsz = offsetofend(struct vfio_iommu_spapr_tce_info, ddw); | |
895 | ||
896 | if (info.argsz >= ddwsz) | |
897 | minsz = ddwsz; | |
5ffd229c AK |
898 | |
899 | if (copy_to_user((void __user *)arg, &info, minsz)) | |
900 | return -EFAULT; | |
901 | ||
902 | return 0; | |
903 | } | |
904 | case VFIO_IOMMU_MAP_DMA: { | |
905 | struct vfio_iommu_type1_dma_map param; | |
0eaf4def | 906 | struct iommu_table *tbl = NULL; |
0eaf4def | 907 | long num; |
05c6cfb9 | 908 | enum dma_data_direction direction; |
5ffd229c | 909 | |
3c56e822 AK |
910 | if (!container->enabled) |
911 | return -EPERM; | |
912 | ||
5ffd229c AK |
913 | minsz = offsetofend(struct vfio_iommu_type1_dma_map, size); |
914 | ||
915 | if (copy_from_user(¶m, (void __user *)arg, minsz)) | |
916 | return -EFAULT; | |
917 | ||
918 | if (param.argsz < minsz) | |
919 | return -EINVAL; | |
920 | ||
921 | if (param.flags & ~(VFIO_DMA_MAP_FLAG_READ | | |
922 | VFIO_DMA_MAP_FLAG_WRITE)) | |
923 | return -EINVAL; | |
924 | ||
d9c72894 AK |
925 | ret = tce_iommu_create_default_window(container); |
926 | if (ret) | |
927 | return ret; | |
928 | ||
0eaf4def AK |
929 | num = tce_iommu_find_table(container, param.iova, &tbl); |
930 | if (num < 0) | |
931 | return -ENXIO; | |
932 | ||
00663d4e AK |
933 | if ((param.size & ~IOMMU_PAGE_MASK(tbl)) || |
934 | (param.vaddr & ~IOMMU_PAGE_MASK(tbl))) | |
5ffd229c AK |
935 | return -EINVAL; |
936 | ||
937 | /* iova is checked by the IOMMU API */ | |
05c6cfb9 AK |
938 | if (param.flags & VFIO_DMA_MAP_FLAG_READ) { |
939 | if (param.flags & VFIO_DMA_MAP_FLAG_WRITE) | |
940 | direction = DMA_BIDIRECTIONAL; | |
941 | else | |
942 | direction = DMA_TO_DEVICE; | |
943 | } else { | |
944 | if (param.flags & VFIO_DMA_MAP_FLAG_WRITE) | |
945 | direction = DMA_FROM_DEVICE; | |
946 | else | |
947 | return -EINVAL; | |
948 | } | |
5ffd229c | 949 | |
05c6cfb9 | 950 | ret = iommu_tce_put_param_check(tbl, param.iova, param.vaddr); |
5ffd229c AK |
951 | if (ret) |
952 | return ret; | |
953 | ||
2157e7b8 AK |
954 | if (container->v2) |
955 | ret = tce_iommu_build_v2(container, tbl, | |
956 | param.iova >> tbl->it_page_shift, | |
957 | param.vaddr, | |
958 | param.size >> tbl->it_page_shift, | |
959 | direction); | |
960 | else | |
961 | ret = tce_iommu_build(container, tbl, | |
962 | param.iova >> tbl->it_page_shift, | |
963 | param.vaddr, | |
964 | param.size >> tbl->it_page_shift, | |
965 | direction); | |
5ffd229c AK |
966 | |
967 | iommu_flush_tce(tbl); | |
968 | ||
969 | return ret; | |
970 | } | |
971 | case VFIO_IOMMU_UNMAP_DMA: { | |
972 | struct vfio_iommu_type1_dma_unmap param; | |
0eaf4def AK |
973 | struct iommu_table *tbl = NULL; |
974 | long num; | |
5ffd229c | 975 | |
3c56e822 AK |
976 | if (!container->enabled) |
977 | return -EPERM; | |
978 | ||
5ffd229c AK |
979 | minsz = offsetofend(struct vfio_iommu_type1_dma_unmap, |
980 | size); | |
981 | ||
982 | if (copy_from_user(¶m, (void __user *)arg, minsz)) | |
983 | return -EFAULT; | |
984 | ||
985 | if (param.argsz < minsz) | |
986 | return -EINVAL; | |
987 | ||
988 | /* No flag is supported now */ | |
989 | if (param.flags) | |
990 | return -EINVAL; | |
991 | ||
d9c72894 AK |
992 | ret = tce_iommu_create_default_window(container); |
993 | if (ret) | |
994 | return ret; | |
995 | ||
0eaf4def AK |
996 | num = tce_iommu_find_table(container, param.iova, &tbl); |
997 | if (num < 0) | |
998 | return -ENXIO; | |
999 | ||
00663d4e | 1000 | if (param.size & ~IOMMU_PAGE_MASK(tbl)) |
5ffd229c AK |
1001 | return -EINVAL; |
1002 | ||
1003 | ret = iommu_tce_clear_param_check(tbl, param.iova, 0, | |
00663d4e | 1004 | param.size >> tbl->it_page_shift); |
5ffd229c AK |
1005 | if (ret) |
1006 | return ret; | |
1007 | ||
9b14a1ff | 1008 | ret = tce_iommu_clear(container, tbl, |
00663d4e AK |
1009 | param.iova >> tbl->it_page_shift, |
1010 | param.size >> tbl->it_page_shift); | |
5ffd229c AK |
1011 | iommu_flush_tce(tbl); |
1012 | ||
1013 | return ret; | |
1014 | } | |
2157e7b8 AK |
1015 | case VFIO_IOMMU_SPAPR_REGISTER_MEMORY: { |
1016 | struct vfio_iommu_spapr_register_memory param; | |
1017 | ||
1018 | if (!container->v2) | |
1019 | break; | |
1020 | ||
1021 | minsz = offsetofend(struct vfio_iommu_spapr_register_memory, | |
1022 | size); | |
1023 | ||
bc82d122 AK |
1024 | ret = tce_iommu_mm_set(container); |
1025 | if (ret) | |
1026 | return ret; | |
1027 | ||
2157e7b8 AK |
1028 | if (copy_from_user(¶m, (void __user *)arg, minsz)) |
1029 | return -EFAULT; | |
1030 | ||
1031 | if (param.argsz < minsz) | |
1032 | return -EINVAL; | |
1033 | ||
1034 | /* No flag is supported now */ | |
1035 | if (param.flags) | |
1036 | return -EINVAL; | |
1037 | ||
1038 | mutex_lock(&container->lock); | |
1039 | ret = tce_iommu_register_pages(container, param.vaddr, | |
1040 | param.size); | |
1041 | mutex_unlock(&container->lock); | |
1042 | ||
1043 | return ret; | |
1044 | } | |
1045 | case VFIO_IOMMU_SPAPR_UNREGISTER_MEMORY: { | |
1046 | struct vfio_iommu_spapr_register_memory param; | |
1047 | ||
1048 | if (!container->v2) | |
1049 | break; | |
1050 | ||
bc82d122 AK |
1051 | if (!container->mm) |
1052 | return -EPERM; | |
1053 | ||
2157e7b8 AK |
1054 | minsz = offsetofend(struct vfio_iommu_spapr_register_memory, |
1055 | size); | |
1056 | ||
1057 | if (copy_from_user(¶m, (void __user *)arg, minsz)) | |
1058 | return -EFAULT; | |
1059 | ||
1060 | if (param.argsz < minsz) | |
1061 | return -EINVAL; | |
1062 | ||
1063 | /* No flag is supported now */ | |
1064 | if (param.flags) | |
1065 | return -EINVAL; | |
1066 | ||
1067 | mutex_lock(&container->lock); | |
1068 | ret = tce_iommu_unregister_pages(container, param.vaddr, | |
1069 | param.size); | |
1070 | mutex_unlock(&container->lock); | |
1071 | ||
1072 | return ret; | |
1073 | } | |
5ffd229c | 1074 | case VFIO_IOMMU_ENABLE: |
2157e7b8 AK |
1075 | if (container->v2) |
1076 | break; | |
1077 | ||
5ffd229c AK |
1078 | mutex_lock(&container->lock); |
1079 | ret = tce_iommu_enable(container); | |
1080 | mutex_unlock(&container->lock); | |
1081 | return ret; | |
1082 | ||
1083 | ||
1084 | case VFIO_IOMMU_DISABLE: | |
2157e7b8 AK |
1085 | if (container->v2) |
1086 | break; | |
1087 | ||
5ffd229c AK |
1088 | mutex_lock(&container->lock); |
1089 | tce_iommu_disable(container); | |
1090 | mutex_unlock(&container->lock); | |
1091 | return 0; | |
1b69be5e | 1092 | |
2157e7b8 AK |
1093 | case VFIO_EEH_PE_OP: { |
1094 | struct tce_iommu_group *tcegrp; | |
1095 | ||
1096 | ret = 0; | |
1097 | list_for_each_entry(tcegrp, &container->group_list, next) { | |
1098 | ret = vfio_spapr_iommu_eeh_ioctl(tcegrp->grp, | |
1099 | cmd, arg); | |
1100 | if (ret) | |
1101 | return ret; | |
1102 | } | |
1103 | return ret; | |
1104 | } | |
1105 | ||
e633bc86 AK |
1106 | case VFIO_IOMMU_SPAPR_TCE_CREATE: { |
1107 | struct vfio_iommu_spapr_tce_create create; | |
1108 | ||
1109 | if (!container->v2) | |
1110 | break; | |
1111 | ||
bc82d122 AK |
1112 | ret = tce_iommu_mm_set(container); |
1113 | if (ret) | |
1114 | return ret; | |
1115 | ||
e633bc86 AK |
1116 | if (!tce_groups_attached(container)) |
1117 | return -ENXIO; | |
1118 | ||
1119 | minsz = offsetofend(struct vfio_iommu_spapr_tce_create, | |
1120 | start_addr); | |
1121 | ||
1122 | if (copy_from_user(&create, (void __user *)arg, minsz)) | |
1123 | return -EFAULT; | |
1124 | ||
1125 | if (create.argsz < minsz) | |
1126 | return -EINVAL; | |
1127 | ||
1128 | if (create.flags) | |
1129 | return -EINVAL; | |
1130 | ||
1131 | mutex_lock(&container->lock); | |
1132 | ||
d9c72894 | 1133 | ret = tce_iommu_create_default_window(container); |
2da64d20 AK |
1134 | if (!ret) |
1135 | ret = tce_iommu_create_window(container, | |
1136 | create.page_shift, | |
1137 | create.window_size, create.levels, | |
1138 | &create.start_addr); | |
e633bc86 AK |
1139 | |
1140 | mutex_unlock(&container->lock); | |
1141 | ||
1142 | if (!ret && copy_to_user((void __user *)arg, &create, minsz)) | |
1143 | ret = -EFAULT; | |
1144 | ||
1145 | return ret; | |
1146 | } | |
1147 | case VFIO_IOMMU_SPAPR_TCE_REMOVE: { | |
1148 | struct vfio_iommu_spapr_tce_remove remove; | |
1149 | ||
1150 | if (!container->v2) | |
1151 | break; | |
1152 | ||
bc82d122 AK |
1153 | ret = tce_iommu_mm_set(container); |
1154 | if (ret) | |
1155 | return ret; | |
1156 | ||
e633bc86 AK |
1157 | if (!tce_groups_attached(container)) |
1158 | return -ENXIO; | |
1159 | ||
1160 | minsz = offsetofend(struct vfio_iommu_spapr_tce_remove, | |
1161 | start_addr); | |
1162 | ||
1163 | if (copy_from_user(&remove, (void __user *)arg, minsz)) | |
1164 | return -EFAULT; | |
1165 | ||
1166 | if (remove.argsz < minsz) | |
1167 | return -EINVAL; | |
1168 | ||
1169 | if (remove.flags) | |
1170 | return -EINVAL; | |
1171 | ||
d9c72894 AK |
1172 | if (container->def_window_pending && !remove.start_addr) { |
1173 | container->def_window_pending = false; | |
1174 | return 0; | |
1175 | } | |
1176 | ||
e633bc86 AK |
1177 | mutex_lock(&container->lock); |
1178 | ||
1179 | ret = tce_iommu_remove_window(container, remove.start_addr); | |
1180 | ||
1181 | mutex_unlock(&container->lock); | |
1182 | ||
1183 | return ret; | |
1184 | } | |
5ffd229c AK |
1185 | } |
1186 | ||
1187 | return -ENOTTY; | |
1188 | } | |
1189 | ||
f87a8864 AK |
1190 | static void tce_iommu_release_ownership(struct tce_container *container, |
1191 | struct iommu_table_group *table_group) | |
1192 | { | |
1193 | int i; | |
1194 | ||
1195 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { | |
2157e7b8 | 1196 | struct iommu_table *tbl = container->tables[i]; |
f87a8864 AK |
1197 | |
1198 | if (!tbl) | |
1199 | continue; | |
1200 | ||
1201 | tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size); | |
bc82d122 | 1202 | tce_iommu_userspace_view_free(tbl, container->mm); |
f87a8864 AK |
1203 | if (tbl->it_map) |
1204 | iommu_release_ownership(tbl); | |
2157e7b8 AK |
1205 | |
1206 | container->tables[i] = NULL; | |
f87a8864 AK |
1207 | } |
1208 | } | |
1209 | ||
1210 | static int tce_iommu_take_ownership(struct tce_container *container, | |
1211 | struct iommu_table_group *table_group) | |
1212 | { | |
1213 | int i, j, rc = 0; | |
1214 | ||
1215 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { | |
1216 | struct iommu_table *tbl = table_group->tables[i]; | |
1217 | ||
1218 | if (!tbl || !tbl->it_map) | |
1219 | continue; | |
1220 | ||
39701e56 | 1221 | rc = iommu_take_ownership(tbl); |
f87a8864 AK |
1222 | if (rc) { |
1223 | for (j = 0; j < i; ++j) | |
1224 | iommu_release_ownership( | |
1225 | table_group->tables[j]); | |
1226 | ||
1227 | return rc; | |
1228 | } | |
1229 | } | |
1230 | ||
2157e7b8 AK |
1231 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) |
1232 | container->tables[i] = table_group->tables[i]; | |
1233 | ||
f87a8864 AK |
1234 | return 0; |
1235 | } | |
1236 | ||
1237 | static void tce_iommu_release_ownership_ddw(struct tce_container *container, | |
1238 | struct iommu_table_group *table_group) | |
1239 | { | |
46d3e1e1 AK |
1240 | long i; |
1241 | ||
1242 | if (!table_group->ops->unset_window) { | |
1243 | WARN_ON_ONCE(1); | |
1244 | return; | |
1245 | } | |
1246 | ||
2157e7b8 | 1247 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) |
46d3e1e1 | 1248 | table_group->ops->unset_window(table_group, i); |
46d3e1e1 | 1249 | |
f87a8864 AK |
1250 | table_group->ops->release_ownership(table_group); |
1251 | } | |
1252 | ||
1253 | static long tce_iommu_take_ownership_ddw(struct tce_container *container, | |
1254 | struct iommu_table_group *table_group) | |
1255 | { | |
930a42de AK |
1256 | long i, ret = 0; |
1257 | ||
46d3e1e1 AK |
1258 | if (!table_group->ops->create_table || !table_group->ops->set_window || |
1259 | !table_group->ops->release_ownership) { | |
1260 | WARN_ON_ONCE(1); | |
1261 | return -EFAULT; | |
1262 | } | |
1263 | ||
f87a8864 AK |
1264 | table_group->ops->take_ownership(table_group); |
1265 | ||
930a42de AK |
1266 | /* Set all windows to the new group */ |
1267 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { | |
1268 | struct iommu_table *tbl = container->tables[i]; | |
1269 | ||
1270 | if (!tbl) | |
1271 | continue; | |
1272 | ||
1273 | ret = table_group->ops->set_window(table_group, i, tbl); | |
1274 | if (ret) | |
1275 | goto release_exit; | |
1276 | } | |
1277 | ||
2157e7b8 | 1278 | return 0; |
930a42de AK |
1279 | |
1280 | release_exit: | |
1281 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) | |
1282 | table_group->ops->unset_window(table_group, i); | |
1283 | ||
1284 | table_group->ops->release_ownership(table_group); | |
1285 | ||
1286 | return ret; | |
f87a8864 AK |
1287 | } |
1288 | ||
5ffd229c AK |
1289 | static int tce_iommu_attach_group(void *iommu_data, |
1290 | struct iommu_group *iommu_group) | |
1291 | { | |
1292 | int ret; | |
1293 | struct tce_container *container = iommu_data; | |
0eaf4def | 1294 | struct iommu_table_group *table_group; |
2157e7b8 | 1295 | struct tce_iommu_group *tcegrp = NULL; |
5ffd229c | 1296 | |
5ffd229c AK |
1297 | mutex_lock(&container->lock); |
1298 | ||
1299 | /* pr_debug("tce_vfio: Attaching group #%u to iommu %p\n", | |
1300 | iommu_group_id(iommu_group), iommu_group); */ | |
2157e7b8 | 1301 | table_group = iommu_group_get_iommudata(iommu_group); |
bd00fdf1 GK |
1302 | if (!table_group) { |
1303 | ret = -ENODEV; | |
1304 | goto unlock_exit; | |
1305 | } | |
2157e7b8 AK |
1306 | |
1307 | if (tce_groups_attached(container) && (!table_group->ops || | |
1308 | !table_group->ops->take_ownership || | |
1309 | !table_group->ops->release_ownership)) { | |
5ffd229c | 1310 | ret = -EBUSY; |
22af4859 AK |
1311 | goto unlock_exit; |
1312 | } | |
1313 | ||
2157e7b8 AK |
1314 | /* Check if new group has the same iommu_ops (i.e. compatible) */ |
1315 | list_for_each_entry(tcegrp, &container->group_list, next) { | |
1316 | struct iommu_table_group *table_group_tmp; | |
1317 | ||
1318 | if (tcegrp->grp == iommu_group) { | |
1319 | pr_warn("tce_vfio: Group %d is already attached\n", | |
1320 | iommu_group_id(iommu_group)); | |
1321 | ret = -EBUSY; | |
1322 | goto unlock_exit; | |
1323 | } | |
1324 | table_group_tmp = iommu_group_get_iommudata(tcegrp->grp); | |
54de285b AK |
1325 | if (table_group_tmp->ops->create_table != |
1326 | table_group->ops->create_table) { | |
2157e7b8 AK |
1327 | pr_warn("tce_vfio: Group %d is incompatible with group %d\n", |
1328 | iommu_group_id(iommu_group), | |
1329 | iommu_group_id(tcegrp->grp)); | |
1330 | ret = -EPERM; | |
1331 | goto unlock_exit; | |
1332 | } | |
5ffd229c AK |
1333 | } |
1334 | ||
2157e7b8 AK |
1335 | tcegrp = kzalloc(sizeof(*tcegrp), GFP_KERNEL); |
1336 | if (!tcegrp) { | |
1337 | ret = -ENOMEM; | |
0eaf4def AK |
1338 | goto unlock_exit; |
1339 | } | |
1340 | ||
f87a8864 | 1341 | if (!table_group->ops || !table_group->ops->take_ownership || |
6f01cc69 | 1342 | !table_group->ops->release_ownership) { |
1282ba7f AK |
1343 | if (container->v2) { |
1344 | ret = -EPERM; | |
1345 | goto unlock_exit; | |
1346 | } | |
f87a8864 | 1347 | ret = tce_iommu_take_ownership(container, table_group); |
6f01cc69 | 1348 | } else { |
1282ba7f AK |
1349 | if (!container->v2) { |
1350 | ret = -EPERM; | |
1351 | goto unlock_exit; | |
1352 | } | |
f87a8864 | 1353 | ret = tce_iommu_take_ownership_ddw(container, table_group); |
6f01cc69 | 1354 | if (!tce_groups_attached(container) && !container->tables[0]) |
d9c72894 | 1355 | container->def_window_pending = true; |
6f01cc69 | 1356 | } |
f87a8864 | 1357 | |
2157e7b8 AK |
1358 | if (!ret) { |
1359 | tcegrp->grp = iommu_group; | |
1360 | list_add(&tcegrp->next, &container->group_list); | |
1361 | } | |
22af4859 AK |
1362 | |
1363 | unlock_exit: | |
2157e7b8 AK |
1364 | if (ret && tcegrp) |
1365 | kfree(tcegrp); | |
1366 | ||
5ffd229c AK |
1367 | mutex_unlock(&container->lock); |
1368 | ||
1369 | return ret; | |
1370 | } | |
1371 | ||
1372 | static void tce_iommu_detach_group(void *iommu_data, | |
1373 | struct iommu_group *iommu_group) | |
1374 | { | |
1375 | struct tce_container *container = iommu_data; | |
0eaf4def | 1376 | struct iommu_table_group *table_group; |
2157e7b8 AK |
1377 | bool found = false; |
1378 | struct tce_iommu_group *tcegrp; | |
5ffd229c | 1379 | |
5ffd229c | 1380 | mutex_lock(&container->lock); |
2157e7b8 AK |
1381 | |
1382 | list_for_each_entry(tcegrp, &container->group_list, next) { | |
1383 | if (tcegrp->grp == iommu_group) { | |
1384 | found = true; | |
1385 | break; | |
1386 | } | |
22af4859 | 1387 | } |
5ffd229c | 1388 | |
2157e7b8 AK |
1389 | if (!found) { |
1390 | pr_warn("tce_vfio: detaching unattached group #%u\n", | |
1391 | iommu_group_id(iommu_group)); | |
1392 | goto unlock_exit; | |
5ffd229c | 1393 | } |
22af4859 | 1394 | |
2157e7b8 AK |
1395 | list_del(&tcegrp->next); |
1396 | kfree(tcegrp); | |
0eaf4def AK |
1397 | |
1398 | table_group = iommu_group_get_iommudata(iommu_group); | |
1399 | BUG_ON(!table_group); | |
1400 | ||
f87a8864 AK |
1401 | if (!table_group->ops || !table_group->ops->release_ownership) |
1402 | tce_iommu_release_ownership(container, table_group); | |
1403 | else | |
1404 | tce_iommu_release_ownership_ddw(container, table_group); | |
22af4859 AK |
1405 | |
1406 | unlock_exit: | |
5ffd229c AK |
1407 | mutex_unlock(&container->lock); |
1408 | } | |
1409 | ||
1410 | const struct vfio_iommu_driver_ops tce_iommu_driver_ops = { | |
1411 | .name = "iommu-vfio-powerpc", | |
1412 | .owner = THIS_MODULE, | |
1413 | .open = tce_iommu_open, | |
1414 | .release = tce_iommu_release, | |
1415 | .ioctl = tce_iommu_ioctl, | |
1416 | .attach_group = tce_iommu_attach_group, | |
1417 | .detach_group = tce_iommu_detach_group, | |
1418 | }; | |
1419 | ||
1420 | static int __init tce_iommu_init(void) | |
1421 | { | |
1422 | return vfio_register_iommu_driver(&tce_iommu_driver_ops); | |
1423 | } | |
1424 | ||
1425 | static void __exit tce_iommu_cleanup(void) | |
1426 | { | |
1427 | vfio_unregister_iommu_driver(&tce_iommu_driver_ops); | |
1428 | } | |
1429 | ||
1430 | module_init(tce_iommu_init); | |
1431 | module_exit(tce_iommu_cleanup); | |
1432 | ||
1433 | MODULE_VERSION(DRIVER_VERSION); | |
1434 | MODULE_LICENSE("GPL v2"); | |
1435 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
1436 | MODULE_DESCRIPTION(DRIVER_DESC); | |
1437 |