Commit | Line | Data |
---|---|---|
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> | |
22 | #include <asm/iommu.h> | |
23 | #include <asm/tce.h> | |
24 | ||
25 | #define DRIVER_VERSION "0.1" | |
26 | #define DRIVER_AUTHOR "aik@ozlabs.ru" | |
27 | #define DRIVER_DESC "VFIO IOMMU SPAPR TCE" | |
28 | ||
29 | static void tce_iommu_detach_group(void *iommu_data, | |
30 | struct iommu_group *iommu_group); | |
31 | ||
2d270df8 AK |
32 | static long try_increment_locked_vm(long npages) |
33 | { | |
34 | long ret = 0, locked, lock_limit; | |
35 | ||
36 | if (!current || !current->mm) | |
37 | return -ESRCH; /* process exited */ | |
38 | ||
39 | if (!npages) | |
40 | return 0; | |
41 | ||
42 | down_write(¤t->mm->mmap_sem); | |
43 | locked = current->mm->locked_vm + npages; | |
44 | lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
45 | if (locked > lock_limit && !capable(CAP_IPC_LOCK)) | |
46 | ret = -ENOMEM; | |
47 | else | |
48 | current->mm->locked_vm += npages; | |
49 | ||
50 | pr_debug("[%d] RLIMIT_MEMLOCK +%ld %ld/%ld%s\n", current->pid, | |
51 | npages << PAGE_SHIFT, | |
52 | current->mm->locked_vm << PAGE_SHIFT, | |
53 | rlimit(RLIMIT_MEMLOCK), | |
54 | ret ? " - exceeded" : ""); | |
55 | ||
56 | up_write(¤t->mm->mmap_sem); | |
57 | ||
58 | return ret; | |
59 | } | |
60 | ||
61 | static void decrement_locked_vm(long npages) | |
62 | { | |
63 | if (!current || !current->mm || !npages) | |
64 | return; /* process exited */ | |
65 | ||
66 | down_write(¤t->mm->mmap_sem); | |
67 | if (WARN_ON_ONCE(npages > current->mm->locked_vm)) | |
68 | npages = current->mm->locked_vm; | |
69 | current->mm->locked_vm -= npages; | |
70 | pr_debug("[%d] RLIMIT_MEMLOCK -%ld %ld/%ld\n", current->pid, | |
71 | npages << PAGE_SHIFT, | |
72 | current->mm->locked_vm << PAGE_SHIFT, | |
73 | rlimit(RLIMIT_MEMLOCK)); | |
74 | up_write(¤t->mm->mmap_sem); | |
75 | } | |
76 | ||
5ffd229c AK |
77 | /* |
78 | * VFIO IOMMU fd for SPAPR_TCE IOMMU implementation | |
79 | * | |
80 | * This code handles mapping and unmapping of user data buffers | |
81 | * into DMA'ble space using the IOMMU | |
82 | */ | |
83 | ||
84 | /* | |
85 | * The container descriptor supports only a single group per container. | |
86 | * Required by the API as the container is not supplied with the IOMMU group | |
87 | * at the moment of initialization. | |
88 | */ | |
89 | struct tce_container { | |
90 | struct mutex lock; | |
0eaf4def | 91 | struct iommu_group *grp; |
5ffd229c | 92 | bool enabled; |
2d270df8 | 93 | unsigned long locked_pages; |
5ffd229c AK |
94 | }; |
95 | ||
e432bc7e AK |
96 | static bool tce_page_is_contained(struct page *page, unsigned page_shift) |
97 | { | |
98 | /* | |
99 | * Check that the TCE table granularity is not bigger than the size of | |
100 | * a page we just found. Otherwise the hardware can get access to | |
101 | * a bigger memory chunk that it should. | |
102 | */ | |
103 | return (PAGE_SHIFT + compound_order(compound_head(page))) >= page_shift; | |
104 | } | |
105 | ||
0eaf4def AK |
106 | static long tce_iommu_find_table(struct tce_container *container, |
107 | phys_addr_t ioba, struct iommu_table **ptbl) | |
108 | { | |
109 | long i; | |
110 | struct iommu_table_group *table_group; | |
111 | ||
112 | table_group = iommu_group_get_iommudata(container->grp); | |
113 | if (!table_group) | |
114 | return -1; | |
115 | ||
116 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { | |
117 | struct iommu_table *tbl = table_group->tables[i]; | |
118 | ||
119 | if (tbl) { | |
120 | unsigned long entry = ioba >> tbl->it_page_shift; | |
121 | unsigned long start = tbl->it_offset; | |
122 | unsigned long end = start + tbl->it_size; | |
123 | ||
124 | if ((start <= entry) && (entry < end)) { | |
125 | *ptbl = tbl; | |
126 | return i; | |
127 | } | |
128 | } | |
129 | } | |
130 | ||
131 | return -1; | |
132 | } | |
133 | ||
5ffd229c AK |
134 | static int tce_iommu_enable(struct tce_container *container) |
135 | { | |
136 | int ret = 0; | |
2d270df8 | 137 | unsigned long locked; |
0eaf4def AK |
138 | struct iommu_table *tbl; |
139 | struct iommu_table_group *table_group; | |
5ffd229c | 140 | |
0eaf4def | 141 | if (!container->grp) |
5ffd229c AK |
142 | return -ENXIO; |
143 | ||
144 | if (!current->mm) | |
145 | return -ESRCH; /* process exited */ | |
146 | ||
147 | if (container->enabled) | |
148 | return -EBUSY; | |
149 | ||
150 | /* | |
151 | * When userspace pages are mapped into the IOMMU, they are effectively | |
152 | * locked memory, so, theoretically, we need to update the accounting | |
153 | * of locked pages on each map and unmap. For powerpc, the map unmap | |
154 | * paths can be very hot, though, and the accounting would kill | |
155 | * performance, especially since it would be difficult to impossible | |
156 | * to handle the accounting in real mode only. | |
157 | * | |
158 | * To address that, rather than precisely accounting every page, we | |
159 | * instead account for a worst case on locked memory when the iommu is | |
160 | * enabled and disabled. The worst case upper bound on locked memory | |
161 | * is the size of the whole iommu window, which is usually relatively | |
162 | * small (compared to total memory sizes) on POWER hardware. | |
163 | * | |
164 | * Also we don't have a nice way to fail on H_PUT_TCE due to ulimits, | |
165 | * that would effectively kill the guest at random points, much better | |
166 | * enforcing the limit based on the max that the guest can map. | |
2d270df8 AK |
167 | * |
168 | * Unfortunately at the moment it counts whole tables, no matter how | |
169 | * much memory the guest has. I.e. for 4GB guest and 4 IOMMU groups | |
170 | * each with 2GB DMA window, 8GB will be counted here. The reason for | |
171 | * this is that we cannot tell here the amount of RAM used by the guest | |
172 | * as this information is only available from KVM and VFIO is | |
173 | * KVM agnostic. | |
5ffd229c | 174 | */ |
0eaf4def AK |
175 | table_group = iommu_group_get_iommudata(container->grp); |
176 | if (!table_group) | |
177 | return -ENODEV; | |
178 | ||
179 | tbl = table_group->tables[0]; | |
2d270df8 AK |
180 | locked = (tbl->it_size << tbl->it_page_shift) >> PAGE_SHIFT; |
181 | ret = try_increment_locked_vm(locked); | |
182 | if (ret) | |
183 | return ret; | |
5ffd229c | 184 | |
2d270df8 AK |
185 | container->locked_pages = locked; |
186 | ||
187 | container->enabled = true; | |
5ffd229c AK |
188 | |
189 | return ret; | |
190 | } | |
191 | ||
192 | static void tce_iommu_disable(struct tce_container *container) | |
193 | { | |
194 | if (!container->enabled) | |
195 | return; | |
196 | ||
197 | container->enabled = false; | |
198 | ||
2d270df8 | 199 | if (!current->mm) |
5ffd229c AK |
200 | return; |
201 | ||
2d270df8 | 202 | decrement_locked_vm(container->locked_pages); |
5ffd229c AK |
203 | } |
204 | ||
205 | static void *tce_iommu_open(unsigned long arg) | |
206 | { | |
207 | struct tce_container *container; | |
208 | ||
209 | if (arg != VFIO_SPAPR_TCE_IOMMU) { | |
210 | pr_err("tce_vfio: Wrong IOMMU type\n"); | |
211 | return ERR_PTR(-EINVAL); | |
212 | } | |
213 | ||
214 | container = kzalloc(sizeof(*container), GFP_KERNEL); | |
215 | if (!container) | |
216 | return ERR_PTR(-ENOMEM); | |
217 | ||
218 | mutex_init(&container->lock); | |
219 | ||
220 | return container; | |
221 | } | |
222 | ||
223 | static void tce_iommu_release(void *iommu_data) | |
224 | { | |
225 | struct tce_container *container = iommu_data; | |
226 | ||
0eaf4def | 227 | WARN_ON(container->grp); |
5ffd229c | 228 | |
0eaf4def AK |
229 | if (container->grp) |
230 | tce_iommu_detach_group(iommu_data, container->grp); | |
5ffd229c | 231 | |
649354b7 | 232 | tce_iommu_disable(container); |
5ffd229c AK |
233 | mutex_destroy(&container->lock); |
234 | ||
235 | kfree(container); | |
236 | } | |
237 | ||
649354b7 AK |
238 | static void tce_iommu_unuse_page(struct tce_container *container, |
239 | unsigned long oldtce) | |
240 | { | |
241 | struct page *page; | |
242 | ||
243 | if (!(oldtce & (TCE_PCI_READ | TCE_PCI_WRITE))) | |
244 | return; | |
245 | ||
246 | page = pfn_to_page(oldtce >> PAGE_SHIFT); | |
247 | ||
248 | if (oldtce & TCE_PCI_WRITE) | |
249 | SetPageDirty(page); | |
250 | ||
251 | put_page(page); | |
252 | } | |
253 | ||
9b14a1ff AK |
254 | static int tce_iommu_clear(struct tce_container *container, |
255 | struct iommu_table *tbl, | |
256 | unsigned long entry, unsigned long pages) | |
257 | { | |
258 | unsigned long oldtce; | |
9b14a1ff AK |
259 | |
260 | for ( ; pages; --pages, ++entry) { | |
261 | oldtce = iommu_clear_tce(tbl, entry); | |
262 | if (!oldtce) | |
263 | continue; | |
264 | ||
649354b7 | 265 | tce_iommu_unuse_page(container, oldtce); |
9b14a1ff AK |
266 | } |
267 | ||
268 | return 0; | |
269 | } | |
270 | ||
649354b7 AK |
271 | static int tce_iommu_use_page(unsigned long tce, unsigned long *hpa) |
272 | { | |
273 | struct page *page = NULL; | |
274 | enum dma_data_direction direction = iommu_tce_direction(tce); | |
275 | ||
276 | if (get_user_pages_fast(tce & PAGE_MASK, 1, | |
277 | direction != DMA_TO_DEVICE, &page) != 1) | |
278 | return -EFAULT; | |
279 | ||
280 | *hpa = __pa((unsigned long) page_address(page)); | |
281 | ||
282 | return 0; | |
283 | } | |
284 | ||
9b14a1ff AK |
285 | static long tce_iommu_build(struct tce_container *container, |
286 | struct iommu_table *tbl, | |
287 | unsigned long entry, unsigned long tce, unsigned long pages) | |
288 | { | |
289 | long i, ret = 0; | |
649354b7 AK |
290 | struct page *page; |
291 | unsigned long hpa; | |
9b14a1ff AK |
292 | enum dma_data_direction direction = iommu_tce_direction(tce); |
293 | ||
294 | for (i = 0; i < pages; ++i) { | |
295 | unsigned long offset = tce & IOMMU_PAGE_MASK(tbl) & ~PAGE_MASK; | |
296 | ||
649354b7 AK |
297 | ret = tce_iommu_use_page(tce, &hpa); |
298 | if (ret) | |
9b14a1ff | 299 | break; |
e432bc7e | 300 | |
649354b7 | 301 | page = pfn_to_page(hpa >> PAGE_SHIFT); |
e432bc7e AK |
302 | if (!tce_page_is_contained(page, tbl->it_page_shift)) { |
303 | ret = -EPERM; | |
304 | break; | |
305 | } | |
306 | ||
649354b7 AK |
307 | hpa |= offset; |
308 | ret = iommu_tce_build(tbl, entry + i, (unsigned long) __va(hpa), | |
309 | direction); | |
9b14a1ff | 310 | if (ret) { |
649354b7 | 311 | tce_iommu_unuse_page(container, hpa); |
9b14a1ff AK |
312 | pr_err("iommu_tce: %s failed ioba=%lx, tce=%lx, ret=%ld\n", |
313 | __func__, entry << tbl->it_page_shift, | |
314 | tce, ret); | |
315 | break; | |
316 | } | |
00663d4e | 317 | tce += IOMMU_PAGE_SIZE(tbl); |
9b14a1ff AK |
318 | } |
319 | ||
320 | if (ret) | |
321 | tce_iommu_clear(container, tbl, entry, i); | |
322 | ||
323 | return ret; | |
324 | } | |
325 | ||
5ffd229c AK |
326 | static long tce_iommu_ioctl(void *iommu_data, |
327 | unsigned int cmd, unsigned long arg) | |
328 | { | |
329 | struct tce_container *container = iommu_data; | |
330 | unsigned long minsz; | |
331 | long ret; | |
332 | ||
333 | switch (cmd) { | |
334 | case VFIO_CHECK_EXTENSION: | |
1b69be5e GS |
335 | switch (arg) { |
336 | case VFIO_SPAPR_TCE_IOMMU: | |
337 | ret = 1; | |
338 | break; | |
339 | default: | |
340 | ret = vfio_spapr_iommu_eeh_ioctl(NULL, cmd, arg); | |
341 | break; | |
342 | } | |
343 | ||
344 | return (ret < 0) ? 0 : ret; | |
5ffd229c AK |
345 | |
346 | case VFIO_IOMMU_SPAPR_TCE_GET_INFO: { | |
347 | struct vfio_iommu_spapr_tce_info info; | |
0eaf4def AK |
348 | struct iommu_table *tbl; |
349 | struct iommu_table_group *table_group; | |
350 | ||
351 | if (WARN_ON(!container->grp)) | |
352 | return -ENXIO; | |
353 | ||
354 | table_group = iommu_group_get_iommudata(container->grp); | |
5ffd229c | 355 | |
0eaf4def AK |
356 | tbl = table_group->tables[0]; |
357 | if (WARN_ON_ONCE(!tbl)) | |
5ffd229c AK |
358 | return -ENXIO; |
359 | ||
360 | minsz = offsetofend(struct vfio_iommu_spapr_tce_info, | |
361 | dma32_window_size); | |
362 | ||
363 | if (copy_from_user(&info, (void __user *)arg, minsz)) | |
364 | return -EFAULT; | |
365 | ||
366 | if (info.argsz < minsz) | |
367 | return -EINVAL; | |
368 | ||
00663d4e AK |
369 | info.dma32_window_start = tbl->it_offset << tbl->it_page_shift; |
370 | info.dma32_window_size = tbl->it_size << tbl->it_page_shift; | |
5ffd229c AK |
371 | info.flags = 0; |
372 | ||
373 | if (copy_to_user((void __user *)arg, &info, minsz)) | |
374 | return -EFAULT; | |
375 | ||
376 | return 0; | |
377 | } | |
378 | case VFIO_IOMMU_MAP_DMA: { | |
379 | struct vfio_iommu_type1_dma_map param; | |
0eaf4def | 380 | struct iommu_table *tbl = NULL; |
9b14a1ff | 381 | unsigned long tce; |
0eaf4def | 382 | long num; |
5ffd229c | 383 | |
3c56e822 AK |
384 | if (!container->enabled) |
385 | return -EPERM; | |
386 | ||
5ffd229c AK |
387 | minsz = offsetofend(struct vfio_iommu_type1_dma_map, size); |
388 | ||
389 | if (copy_from_user(¶m, (void __user *)arg, minsz)) | |
390 | return -EFAULT; | |
391 | ||
392 | if (param.argsz < minsz) | |
393 | return -EINVAL; | |
394 | ||
395 | if (param.flags & ~(VFIO_DMA_MAP_FLAG_READ | | |
396 | VFIO_DMA_MAP_FLAG_WRITE)) | |
397 | return -EINVAL; | |
398 | ||
0eaf4def AK |
399 | num = tce_iommu_find_table(container, param.iova, &tbl); |
400 | if (num < 0) | |
401 | return -ENXIO; | |
402 | ||
00663d4e AK |
403 | if ((param.size & ~IOMMU_PAGE_MASK(tbl)) || |
404 | (param.vaddr & ~IOMMU_PAGE_MASK(tbl))) | |
5ffd229c AK |
405 | return -EINVAL; |
406 | ||
407 | /* iova is checked by the IOMMU API */ | |
408 | tce = param.vaddr; | |
409 | if (param.flags & VFIO_DMA_MAP_FLAG_READ) | |
410 | tce |= TCE_PCI_READ; | |
411 | if (param.flags & VFIO_DMA_MAP_FLAG_WRITE) | |
412 | tce |= TCE_PCI_WRITE; | |
413 | ||
414 | ret = iommu_tce_put_param_check(tbl, param.iova, tce); | |
415 | if (ret) | |
416 | return ret; | |
417 | ||
9b14a1ff | 418 | ret = tce_iommu_build(container, tbl, |
00663d4e AK |
419 | param.iova >> tbl->it_page_shift, |
420 | tce, param.size >> tbl->it_page_shift); | |
5ffd229c AK |
421 | |
422 | iommu_flush_tce(tbl); | |
423 | ||
424 | return ret; | |
425 | } | |
426 | case VFIO_IOMMU_UNMAP_DMA: { | |
427 | struct vfio_iommu_type1_dma_unmap param; | |
0eaf4def AK |
428 | struct iommu_table *tbl = NULL; |
429 | long num; | |
5ffd229c | 430 | |
3c56e822 AK |
431 | if (!container->enabled) |
432 | return -EPERM; | |
433 | ||
5ffd229c AK |
434 | minsz = offsetofend(struct vfio_iommu_type1_dma_unmap, |
435 | size); | |
436 | ||
437 | if (copy_from_user(¶m, (void __user *)arg, minsz)) | |
438 | return -EFAULT; | |
439 | ||
440 | if (param.argsz < minsz) | |
441 | return -EINVAL; | |
442 | ||
443 | /* No flag is supported now */ | |
444 | if (param.flags) | |
445 | return -EINVAL; | |
446 | ||
0eaf4def AK |
447 | num = tce_iommu_find_table(container, param.iova, &tbl); |
448 | if (num < 0) | |
449 | return -ENXIO; | |
450 | ||
00663d4e | 451 | if (param.size & ~IOMMU_PAGE_MASK(tbl)) |
5ffd229c AK |
452 | return -EINVAL; |
453 | ||
454 | ret = iommu_tce_clear_param_check(tbl, param.iova, 0, | |
00663d4e | 455 | param.size >> tbl->it_page_shift); |
5ffd229c AK |
456 | if (ret) |
457 | return ret; | |
458 | ||
9b14a1ff | 459 | ret = tce_iommu_clear(container, tbl, |
00663d4e AK |
460 | param.iova >> tbl->it_page_shift, |
461 | param.size >> tbl->it_page_shift); | |
5ffd229c AK |
462 | iommu_flush_tce(tbl); |
463 | ||
464 | return ret; | |
465 | } | |
466 | case VFIO_IOMMU_ENABLE: | |
467 | mutex_lock(&container->lock); | |
468 | ret = tce_iommu_enable(container); | |
469 | mutex_unlock(&container->lock); | |
470 | return ret; | |
471 | ||
472 | ||
473 | case VFIO_IOMMU_DISABLE: | |
474 | mutex_lock(&container->lock); | |
475 | tce_iommu_disable(container); | |
476 | mutex_unlock(&container->lock); | |
477 | return 0; | |
1b69be5e | 478 | case VFIO_EEH_PE_OP: |
0eaf4def | 479 | if (!container->grp) |
1b69be5e GS |
480 | return -ENODEV; |
481 | ||
0eaf4def AK |
482 | return vfio_spapr_iommu_eeh_ioctl(container->grp, |
483 | cmd, arg); | |
5ffd229c AK |
484 | } |
485 | ||
486 | return -ENOTTY; | |
487 | } | |
488 | ||
489 | static int tce_iommu_attach_group(void *iommu_data, | |
490 | struct iommu_group *iommu_group) | |
491 | { | |
492 | int ret; | |
493 | struct tce_container *container = iommu_data; | |
0eaf4def | 494 | struct iommu_table_group *table_group; |
5ffd229c | 495 | |
5ffd229c AK |
496 | mutex_lock(&container->lock); |
497 | ||
498 | /* pr_debug("tce_vfio: Attaching group #%u to iommu %p\n", | |
499 | iommu_group_id(iommu_group), iommu_group); */ | |
0eaf4def | 500 | if (container->grp) { |
5ffd229c | 501 | pr_warn("tce_vfio: Only one group per IOMMU container is allowed, existing id=%d, attaching id=%d\n", |
0eaf4def | 502 | iommu_group_id(container->grp), |
5ffd229c AK |
503 | iommu_group_id(iommu_group)); |
504 | ret = -EBUSY; | |
22af4859 AK |
505 | goto unlock_exit; |
506 | } | |
507 | ||
508 | if (container->enabled) { | |
5ffd229c AK |
509 | pr_err("tce_vfio: attaching group #%u to enabled container\n", |
510 | iommu_group_id(iommu_group)); | |
511 | ret = -EBUSY; | |
22af4859 | 512 | goto unlock_exit; |
5ffd229c AK |
513 | } |
514 | ||
0eaf4def AK |
515 | table_group = iommu_group_get_iommudata(iommu_group); |
516 | if (!table_group) { | |
517 | ret = -ENXIO; | |
518 | goto unlock_exit; | |
519 | } | |
520 | ||
521 | ret = iommu_take_ownership(table_group->tables[0]); | |
22af4859 | 522 | if (!ret) |
0eaf4def | 523 | container->grp = iommu_group; |
22af4859 AK |
524 | |
525 | unlock_exit: | |
5ffd229c AK |
526 | mutex_unlock(&container->lock); |
527 | ||
528 | return ret; | |
529 | } | |
530 | ||
531 | static void tce_iommu_detach_group(void *iommu_data, | |
532 | struct iommu_group *iommu_group) | |
533 | { | |
534 | struct tce_container *container = iommu_data; | |
0eaf4def AK |
535 | struct iommu_table_group *table_group; |
536 | struct iommu_table *tbl; | |
5ffd229c | 537 | |
5ffd229c | 538 | mutex_lock(&container->lock); |
0eaf4def | 539 | if (iommu_group != container->grp) { |
5ffd229c AK |
540 | pr_warn("tce_vfio: detaching group #%u, expected group is #%u\n", |
541 | iommu_group_id(iommu_group), | |
0eaf4def | 542 | iommu_group_id(container->grp)); |
22af4859 AK |
543 | goto unlock_exit; |
544 | } | |
5ffd229c | 545 | |
22af4859 AK |
546 | if (container->enabled) { |
547 | pr_warn("tce_vfio: detaching group #%u from enabled container, forcing disable\n", | |
0eaf4def | 548 | iommu_group_id(container->grp)); |
22af4859 | 549 | tce_iommu_disable(container); |
5ffd229c | 550 | } |
22af4859 AK |
551 | |
552 | /* pr_debug("tce_vfio: detaching group #%u from iommu %p\n", | |
553 | iommu_group_id(iommu_group), iommu_group); */ | |
0eaf4def AK |
554 | container->grp = NULL; |
555 | ||
556 | table_group = iommu_group_get_iommudata(iommu_group); | |
557 | BUG_ON(!table_group); | |
558 | ||
559 | tbl = table_group->tables[0]; | |
22af4859 AK |
560 | tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size); |
561 | iommu_release_ownership(tbl); | |
562 | ||
563 | unlock_exit: | |
5ffd229c AK |
564 | mutex_unlock(&container->lock); |
565 | } | |
566 | ||
567 | const struct vfio_iommu_driver_ops tce_iommu_driver_ops = { | |
568 | .name = "iommu-vfio-powerpc", | |
569 | .owner = THIS_MODULE, | |
570 | .open = tce_iommu_open, | |
571 | .release = tce_iommu_release, | |
572 | .ioctl = tce_iommu_ioctl, | |
573 | .attach_group = tce_iommu_attach_group, | |
574 | .detach_group = tce_iommu_detach_group, | |
575 | }; | |
576 | ||
577 | static int __init tce_iommu_init(void) | |
578 | { | |
579 | return vfio_register_iommu_driver(&tce_iommu_driver_ops); | |
580 | } | |
581 | ||
582 | static void __exit tce_iommu_cleanup(void) | |
583 | { | |
584 | vfio_unregister_iommu_driver(&tce_iommu_driver_ops); | |
585 | } | |
586 | ||
587 | module_init(tce_iommu_init); | |
588 | module_exit(tce_iommu_cleanup); | |
589 | ||
590 | MODULE_VERSION(DRIVER_VERSION); | |
591 | MODULE_LICENSE("GPL v2"); | |
592 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
593 | MODULE_DESCRIPTION(DRIVER_DESC); | |
594 |