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perf bench futex: Cache align the worker struct
[linux/fpc-iii.git] / drivers / vfio / vfio_iommu_spapr_tce.c
blob80378ddadc5ca4581bcba2792dc49f56209f2902
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 <linux/vmalloc.h>
23 #include <asm/iommu.h>
24 #include <asm/tce.h>
25 #include <asm/mmu_context.h>
26
27 #define DRIVER_VERSION "0.1"
28 #define DRIVER_AUTHOR "aik@ozlabs.ru"
29 #define DRIVER_DESC "VFIO IOMMU SPAPR TCE"
30
31 static void tce_iommu_detach_group(void *iommu_data,
32 struct iommu_group *iommu_group);
33
34 static long try_increment_locked_vm(long npages)
35 {
36 long ret = 0, locked, lock_limit;
37
38 if (!current || !current->mm)
39 return -ESRCH; /* process exited */
40
41 if (!npages)
42 return 0;
43
44 down_write(&current->mm->mmap_sem);
45 locked = current->mm->locked_vm + npages;
46 lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
47 if (locked > lock_limit && !capable(CAP_IPC_LOCK))
48 ret = -ENOMEM;
49 else
50 current->mm->locked_vm += npages;
51
52 pr_debug("[%d] RLIMIT_MEMLOCK +%ld %ld/%ld%s\n", current->pid,
53 npages << PAGE_SHIFT,
54 current->mm->locked_vm << PAGE_SHIFT,
55 rlimit(RLIMIT_MEMLOCK),
56 ret ? " - exceeded" : "");
57
58 up_write(&current->mm->mmap_sem);
59
60 return ret;
61 }
62
63 static void decrement_locked_vm(long npages)
64 {
65 if (!current || !current->mm || !npages)
66 return; /* process exited */
67
68 down_write(&current->mm->mmap_sem);
69 if (WARN_ON_ONCE(npages > current->mm->locked_vm))
70 npages = current->mm->locked_vm;
71 current->mm->locked_vm -= npages;
72 pr_debug("[%d] RLIMIT_MEMLOCK -%ld %ld/%ld\n", current->pid,
73 npages << PAGE_SHIFT,
74 current->mm->locked_vm << PAGE_SHIFT,
75 rlimit(RLIMIT_MEMLOCK));
76 up_write(&current->mm->mmap_sem);
77 }
78
79 /*
80 * VFIO IOMMU fd for SPAPR_TCE IOMMU implementation
81 *
82 * This code handles mapping and unmapping of user data buffers
83 * into DMA'ble space using the IOMMU
84 */
85
86 struct tce_iommu_group {
87 struct list_head next;
88 struct iommu_group *grp;
89 };
90
91 /*
92 * The container descriptor supports only a single group per container.
93 * Required by the API as the container is not supplied with the IOMMU group
94 * at the moment of initialization.
95 */
96 struct tce_container {
97 struct mutex lock;
98 bool enabled;
99 bool v2;
100 unsigned long locked_pages;
101 struct iommu_table *tables[IOMMU_TABLE_GROUP_MAX_TABLES];
102 struct list_head group_list;
103 };
104
105 static long tce_iommu_unregister_pages(struct tce_container *container,
106 __u64 vaddr, __u64 size)
107 {
108 struct mm_iommu_table_group_mem_t *mem;
109
110 if ((vaddr & ~PAGE_MASK) || (size & ~PAGE_MASK))
111 return -EINVAL;
112
113 mem = mm_iommu_find(vaddr, size >> PAGE_SHIFT);
114 if (!mem)
115 return -ENOENT;
116
117 return mm_iommu_put(mem);
118 }
119
120 static long tce_iommu_register_pages(struct tce_container *container,
121 __u64 vaddr, __u64 size)
122 {
123 long ret = 0;
124 struct mm_iommu_table_group_mem_t *mem = NULL;
125 unsigned long entries = size >> PAGE_SHIFT;
126
127 if ((vaddr & ~PAGE_MASK) || (size & ~PAGE_MASK) ||
128 ((vaddr + size) < vaddr))
129 return -EINVAL;
130
131 ret = mm_iommu_get(vaddr, entries, &mem);
132 if (ret)
133 return ret;
134
135 container->enabled = true;
136
137 return 0;
138 }
139
140 static long tce_iommu_userspace_view_alloc(struct iommu_table *tbl)
141 {
142 unsigned long cb = _ALIGN_UP(sizeof(tbl->it_userspace[0]) *
143 tbl->it_size, PAGE_SIZE);
144 unsigned long *uas;
145 long ret;
146
147 BUG_ON(tbl->it_userspace);
148
149 ret = try_increment_locked_vm(cb >> PAGE_SHIFT);
150 if (ret)
151 return ret;
152
153 uas = vzalloc(cb);
154 if (!uas) {
155 decrement_locked_vm(cb >> PAGE_SHIFT);
156 return -ENOMEM;
157 }
158 tbl->it_userspace = uas;
159
160 return 0;
161 }
162
163 static void tce_iommu_userspace_view_free(struct iommu_table *tbl)
164 {
165 unsigned long cb = _ALIGN_UP(sizeof(tbl->it_userspace[0]) *
166 tbl->it_size, PAGE_SIZE);
167
168 if (!tbl->it_userspace)
169 return;
170
171 vfree(tbl->it_userspace);
172 tbl->it_userspace = NULL;
173 decrement_locked_vm(cb >> PAGE_SHIFT);
174 }
175
176 static bool tce_page_is_contained(struct page *page, unsigned page_shift)
177 {
178 /*
179 * Check that the TCE table granularity is not bigger than the size of
180 * a page we just found. Otherwise the hardware can get access to
181 * a bigger memory chunk that it should.
182 */
183 return (PAGE_SHIFT + compound_order(compound_head(page))) >= page_shift;
184 }
185
186 static inline bool tce_groups_attached(struct tce_container *container)
187 {
188 return !list_empty(&container->group_list);
189 }
190
191 static long tce_iommu_find_table(struct tce_container *container,
192 phys_addr_t ioba, struct iommu_table **ptbl)
193 {
194 long i;
195
196 for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
197 struct iommu_table *tbl = container->tables[i];
198
199 if (tbl) {
200 unsigned long entry = ioba >> tbl->it_page_shift;
201 unsigned long start = tbl->it_offset;
202 unsigned long end = start + tbl->it_size;
203
204 if ((start <= entry) && (entry < end)) {
205 *ptbl = tbl;
206 return i;
207 }
208 }
209 }
210
211 return -1;
212 }
213
214 static int tce_iommu_find_free_table(struct tce_container *container)
215 {
216 int i;
217
218 for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
219 if (!container->tables[i])
220 return i;
221 }
222
223 return -ENOSPC;
224 }
225
226 static int tce_iommu_enable(struct tce_container *container)
227 {
228 int ret = 0;
229 unsigned long locked;
230 struct iommu_table_group *table_group;
231 struct tce_iommu_group *tcegrp;
232
233 if (!current->mm)
234 return -ESRCH; /* process exited */
235
236 if (container->enabled)
237 return -EBUSY;
238
239 /*
240 * When userspace pages are mapped into the IOMMU, they are effectively
241 * locked memory, so, theoretically, we need to update the accounting
242 * of locked pages on each map and unmap. For powerpc, the map unmap
243 * paths can be very hot, though, and the accounting would kill
244 * performance, especially since it would be difficult to impossible
245 * to handle the accounting in real mode only.
246 *
247 * To address that, rather than precisely accounting every page, we
248 * instead account for a worst case on locked memory when the iommu is
249 * enabled and disabled. The worst case upper bound on locked memory
250 * is the size of the whole iommu window, which is usually relatively
251 * small (compared to total memory sizes) on POWER hardware.
252 *
253 * Also we don't have a nice way to fail on H_PUT_TCE due to ulimits,
254 * that would effectively kill the guest at random points, much better
255 * enforcing the limit based on the max that the guest can map.
256 *
257 * Unfortunately at the moment it counts whole tables, no matter how
258 * much memory the guest has. I.e. for 4GB guest and 4 IOMMU groups
259 * each with 2GB DMA window, 8GB will be counted here. The reason for
260 * this is that we cannot tell here the amount of RAM used by the guest
261 * as this information is only available from KVM and VFIO is
262 * KVM agnostic.
263 *
264 * So we do not allow enabling a container without a group attached
265 * as there is no way to know how much we should increment
266 * the locked_vm counter.
267 */
268 if (!tce_groups_attached(container))
269 return -ENODEV;
270
271 tcegrp = list_first_entry(&container->group_list,
272 struct tce_iommu_group, next);
273 table_group = iommu_group_get_iommudata(tcegrp->grp);
274 if (!table_group)
275 return -ENODEV;
276
277 if (!table_group->tce32_size)
278 return -EPERM;
279
280 locked = table_group->tce32_size >> PAGE_SHIFT;
281 ret = try_increment_locked_vm(locked);
282 if (ret)
283 return ret;
284
285 container->locked_pages = locked;
286
287 container->enabled = true;
288
289 return ret;
290 }
291
292 static void tce_iommu_disable(struct tce_container *container)
293 {
294 if (!container->enabled)
295 return;
296
297 container->enabled = false;
298
299 if (!current->mm)
300 return;
301
302 decrement_locked_vm(container->locked_pages);
303 }
304
305 static void *tce_iommu_open(unsigned long arg)
306 {
307 struct tce_container *container;
308
309 if ((arg != VFIO_SPAPR_TCE_IOMMU) && (arg != VFIO_SPAPR_TCE_v2_IOMMU)) {
310 pr_err("tce_vfio: Wrong IOMMU type\n");
311 return ERR_PTR(-EINVAL);
312 }
313
314 container = kzalloc(sizeof(*container), GFP_KERNEL);
315 if (!container)
316 return ERR_PTR(-ENOMEM);
317
318 mutex_init(&container->lock);
319 INIT_LIST_HEAD_RCU(&container->group_list);
320
321 container->v2 = arg == VFIO_SPAPR_TCE_v2_IOMMU;
322
323 return container;
324 }
325
326 static int tce_iommu_clear(struct tce_container *container,
327 struct iommu_table *tbl,
328 unsigned long entry, unsigned long pages);
329 static void tce_iommu_free_table(struct iommu_table *tbl);
330
331 static void tce_iommu_release(void *iommu_data)
332 {
333 struct tce_container *container = iommu_data;
334 struct tce_iommu_group *tcegrp;
335 long i;
336
337 while (tce_groups_attached(container)) {
338 tcegrp = list_first_entry(&container->group_list,
339 struct tce_iommu_group, next);
340 tce_iommu_detach_group(iommu_data, tcegrp->grp);
341 }
342
343 /*
344 * If VFIO created a table, it was not disposed
345 * by tce_iommu_detach_group() so do it now.
346 */
347 for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
348 struct iommu_table *tbl = container->tables[i];
349
350 if (!tbl)
351 continue;
352
353 tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size);
354 tce_iommu_free_table(tbl);
355 }
356
357 tce_iommu_disable(container);
358 mutex_destroy(&container->lock);
359
360 kfree(container);
361 }
362
363 static void tce_iommu_unuse_page(struct tce_container *container,
364 unsigned long hpa)
365 {
366 struct page *page;
367
368 page = pfn_to_page(hpa >> PAGE_SHIFT);
369 put_page(page);
370 }
371
372 static int tce_iommu_prereg_ua_to_hpa(unsigned long tce, unsigned long size,
373 unsigned long *phpa, struct mm_iommu_table_group_mem_t **pmem)
374 {
375 long ret = 0;
376 struct mm_iommu_table_group_mem_t *mem;
377
378 mem = mm_iommu_lookup(tce, size);
379 if (!mem)
380 return -EINVAL;
381
382 ret = mm_iommu_ua_to_hpa(mem, tce, phpa);
383 if (ret)
384 return -EINVAL;
385
386 *pmem = mem;
387
388 return 0;
389 }
390
391 static void tce_iommu_unuse_page_v2(struct iommu_table *tbl,
392 unsigned long entry)
393 {
394 struct mm_iommu_table_group_mem_t *mem = NULL;
395 int ret;
396 unsigned long hpa = 0;
397 unsigned long *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl, entry);
398
399 if (!pua || !current || !current->mm)
400 return;
401
402 ret = tce_iommu_prereg_ua_to_hpa(*pua, IOMMU_PAGE_SIZE(tbl),
403 &hpa, &mem);
404 if (ret)
405 pr_debug("%s: tce %lx at #%lx was not cached, ret=%d\n",
406 __func__, *pua, entry, ret);
407 if (mem)
408 mm_iommu_mapped_dec(mem);
409
410 *pua = 0;
411 }
412
413 static int tce_iommu_clear(struct tce_container *container,
414 struct iommu_table *tbl,
415 unsigned long entry, unsigned long pages)
416 {
417 unsigned long oldhpa;
418 long ret;
419 enum dma_data_direction direction;
420
421 for ( ; pages; --pages, ++entry) {
422 direction = DMA_NONE;
423 oldhpa = 0;
424 ret = iommu_tce_xchg(tbl, entry, &oldhpa, &direction);
425 if (ret)
426 continue;
427
428 if (direction == DMA_NONE)
429 continue;
430
431 if (container->v2) {
432 tce_iommu_unuse_page_v2(tbl, entry);
433 continue;
434 }
435
436 tce_iommu_unuse_page(container, oldhpa);
437 }
438
439 return 0;
440 }
441
442 static int tce_iommu_use_page(unsigned long tce, unsigned long *hpa)
443 {
444 struct page *page = NULL;
445 enum dma_data_direction direction = iommu_tce_direction(tce);
446
447 if (get_user_pages_fast(tce & PAGE_MASK, 1,
448 direction != DMA_TO_DEVICE, &page) != 1)
449 return -EFAULT;
450
451 *hpa = __pa((unsigned long) page_address(page));
452
453 return 0;
454 }
455
456 static long tce_iommu_build(struct tce_container *container,
457 struct iommu_table *tbl,
458 unsigned long entry, unsigned long tce, unsigned long pages,
459 enum dma_data_direction direction)
460 {
461 long i, ret = 0;
462 struct page *page;
463 unsigned long hpa;
464 enum dma_data_direction dirtmp;
465
466 for (i = 0; i < pages; ++i) {
467 unsigned long offset = tce & IOMMU_PAGE_MASK(tbl) & ~PAGE_MASK;
468
469 ret = tce_iommu_use_page(tce, &hpa);
470 if (ret)
471 break;
472
473 page = pfn_to_page(hpa >> PAGE_SHIFT);
474 if (!tce_page_is_contained(page, tbl->it_page_shift)) {
475 ret = -EPERM;
476 break;
477 }
478
479 hpa |= offset;
480 dirtmp = direction;
481 ret = iommu_tce_xchg(tbl, entry + i, &hpa, &dirtmp);
482 if (ret) {
483 tce_iommu_unuse_page(container, hpa);
484 pr_err("iommu_tce: %s failed ioba=%lx, tce=%lx, ret=%ld\n",
485 __func__, entry << tbl->it_page_shift,
486 tce, ret);
487 break;
488 }
489
490 if (dirtmp != DMA_NONE)
491 tce_iommu_unuse_page(container, hpa);
492
493 tce += IOMMU_PAGE_SIZE(tbl);
494 }
495
496 if (ret)
497 tce_iommu_clear(container, tbl, entry, i);
498
499 return ret;
500 }
501
502 static long tce_iommu_build_v2(struct tce_container *container,
503 struct iommu_table *tbl,
504 unsigned long entry, unsigned long tce, unsigned long pages,
505 enum dma_data_direction direction)
506 {
507 long i, ret = 0;
508 struct page *page;
509 unsigned long hpa;
510 enum dma_data_direction dirtmp;
511
512 for (i = 0; i < pages; ++i) {
513 struct mm_iommu_table_group_mem_t *mem = NULL;
514 unsigned long *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl,
515 entry + i);
516
517 ret = tce_iommu_prereg_ua_to_hpa(tce, IOMMU_PAGE_SIZE(tbl),
518 &hpa, &mem);
519 if (ret)
520 break;
521
522 page = pfn_to_page(hpa >> PAGE_SHIFT);
523 if (!tce_page_is_contained(page, tbl->it_page_shift)) {
524 ret = -EPERM;
525 break;
526 }
527
528 /* Preserve offset within IOMMU page */
529 hpa |= tce & IOMMU_PAGE_MASK(tbl) & ~PAGE_MASK;
530 dirtmp = direction;
531
532 /* The registered region is being unregistered */
533 if (mm_iommu_mapped_inc(mem))
534 break;
535
536 ret = iommu_tce_xchg(tbl, entry + i, &hpa, &dirtmp);
537 if (ret) {
538 /* dirtmp cannot be DMA_NONE here */
539 tce_iommu_unuse_page_v2(tbl, entry + i);
540 pr_err("iommu_tce: %s failed ioba=%lx, tce=%lx, ret=%ld\n",
541 __func__, entry << tbl->it_page_shift,
542 tce, ret);
543 break;
544 }
545
546 if (dirtmp != DMA_NONE)
547 tce_iommu_unuse_page_v2(tbl, entry + i);
548
549 *pua = tce;
550
551 tce += IOMMU_PAGE_SIZE(tbl);
552 }
553
554 if (ret)
555 tce_iommu_clear(container, tbl, entry, i);
556
557 return ret;
558 }
559
560 static long tce_iommu_create_table(struct tce_container *container,
561 struct iommu_table_group *table_group,
562 int num,
563 __u32 page_shift,
564 __u64 window_size,
565 __u32 levels,
566 struct iommu_table **ptbl)
567 {
568 long ret, table_size;
569
570 table_size = table_group->ops->get_table_size(page_shift, window_size,
571 levels);
572 if (!table_size)
573 return -EINVAL;
574
575 ret = try_increment_locked_vm(table_size >> PAGE_SHIFT);
576 if (ret)
577 return ret;
578
579 ret = table_group->ops->create_table(table_group, num,
580 page_shift, window_size, levels, ptbl);
581
582 WARN_ON(!ret && !(*ptbl)->it_ops->free);
583 WARN_ON(!ret && ((*ptbl)->it_allocated_size != table_size));
584
585 if (!ret && container->v2) {
586 ret = tce_iommu_userspace_view_alloc(*ptbl);
587 if (ret)
588 (*ptbl)->it_ops->free(*ptbl);
589 }
590
591 if (ret)
592 decrement_locked_vm(table_size >> PAGE_SHIFT);
593
594 return ret;
595 }
596
597 static void tce_iommu_free_table(struct iommu_table *tbl)
598 {
599 unsigned long pages = tbl->it_allocated_size >> PAGE_SHIFT;
600
601 tce_iommu_userspace_view_free(tbl);
602 tbl->it_ops->free(tbl);
603 decrement_locked_vm(pages);
604 }
605
606 static long tce_iommu_create_window(struct tce_container *container,
607 __u32 page_shift, __u64 window_size, __u32 levels,
608 __u64 *start_addr)
609 {
610 struct tce_iommu_group *tcegrp;
611 struct iommu_table_group *table_group;
612 struct iommu_table *tbl = NULL;
613 long ret, num;
614
615 num = tce_iommu_find_free_table(container);
616 if (num < 0)
617 return num;
618
619 /* Get the first group for ops::create_table */
620 tcegrp = list_first_entry(&container->group_list,
621 struct tce_iommu_group, next);
622 table_group = iommu_group_get_iommudata(tcegrp->grp);
623 if (!table_group)
624 return -EFAULT;
625
626 if (!(table_group->pgsizes & (1ULL << page_shift)))
627 return -EINVAL;
628
629 if (!table_group->ops->set_window || !table_group->ops->unset_window ||
630 !table_group->ops->get_table_size ||
631 !table_group->ops->create_table)
632 return -EPERM;
633
634 /* Create TCE table */
635 ret = tce_iommu_create_table(container, table_group, num,
636 page_shift, window_size, levels, &tbl);
637 if (ret)
638 return ret;
639
640 BUG_ON(!tbl->it_ops->free);
641
642 /*
643 * Program the table to every group.
644 * Groups have been tested for compatibility at the attach time.
645 */
646 list_for_each_entry(tcegrp, &container->group_list, next) {
647 table_group = iommu_group_get_iommudata(tcegrp->grp);
648
649 ret = table_group->ops->set_window(table_group, num, tbl);
650 if (ret)
651 goto unset_exit;
652 }
653
654 container->tables[num] = tbl;
655
656 /* Return start address assigned by platform in create_table() */
657 *start_addr = tbl->it_offset << tbl->it_page_shift;
658
659 return 0;
660
661 unset_exit:
662 list_for_each_entry(tcegrp, &container->group_list, next) {
663 table_group = iommu_group_get_iommudata(tcegrp->grp);
664 table_group->ops->unset_window(table_group, num);
665 }
666 tce_iommu_free_table(tbl);
667
668 return ret;
669 }
670
671 static long tce_iommu_remove_window(struct tce_container *container,
672 __u64 start_addr)
673 {
674 struct iommu_table_group *table_group = NULL;
675 struct iommu_table *tbl;
676 struct tce_iommu_group *tcegrp;
677 int num;
678
679 num = tce_iommu_find_table(container, start_addr, &tbl);
680 if (num < 0)
681 return -EINVAL;
682
683 BUG_ON(!tbl->it_size);
684
685 /* Detach groups from IOMMUs */
686 list_for_each_entry(tcegrp, &container->group_list, next) {
687 table_group = iommu_group_get_iommudata(tcegrp->grp);
688
689 /*
690 * SPAPR TCE IOMMU exposes the default DMA window to
691 * the guest via dma32_window_start/size of
692 * VFIO_IOMMU_SPAPR_TCE_GET_INFO. Some platforms allow
693 * the userspace to remove this window, some do not so
694 * here we check for the platform capability.
695 */
696 if (!table_group->ops || !table_group->ops->unset_window)
697 return -EPERM;
698
699 table_group->ops->unset_window(table_group, num);
700 }
701
702 /* Free table */
703 tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size);
704 tce_iommu_free_table(tbl);
705 container->tables[num] = NULL;
706
707 return 0;
708 }
709
710 static long tce_iommu_ioctl(void *iommu_data,
711 unsigned int cmd, unsigned long arg)
712 {
713 struct tce_container *container = iommu_data;
714 unsigned long minsz, ddwsz;
715 long ret;
716
717 switch (cmd) {
718 case VFIO_CHECK_EXTENSION:
719 switch (arg) {
720 case VFIO_SPAPR_TCE_IOMMU:
721 case VFIO_SPAPR_TCE_v2_IOMMU:
722 ret = 1;
723 break;
724 default:
725 ret = vfio_spapr_iommu_eeh_ioctl(NULL, cmd, arg);
726 break;
727 }
728
729 return (ret < 0) ? 0 : ret;
730
731 case VFIO_IOMMU_SPAPR_TCE_GET_INFO: {
732 struct vfio_iommu_spapr_tce_info info;
733 struct tce_iommu_group *tcegrp;
734 struct iommu_table_group *table_group;
735
736 if (!tce_groups_attached(container))
737 return -ENXIO;
738
739 tcegrp = list_first_entry(&container->group_list,
740 struct tce_iommu_group, next);
741 table_group = iommu_group_get_iommudata(tcegrp->grp);
742
743 if (!table_group)
744 return -ENXIO;
745
746 minsz = offsetofend(struct vfio_iommu_spapr_tce_info,
747 dma32_window_size);
748
749 if (copy_from_user(&info, (void __user *)arg, minsz))
750 return -EFAULT;
751
752 if (info.argsz < minsz)
753 return -EINVAL;
754
755 info.dma32_window_start = table_group->tce32_start;
756 info.dma32_window_size = table_group->tce32_size;
757 info.flags = 0;
758 memset(&info.ddw, 0, sizeof(info.ddw));
759
760 if (table_group->max_dynamic_windows_supported &&
761 container->v2) {
762 info.flags |= VFIO_IOMMU_SPAPR_INFO_DDW;
763 info.ddw.pgsizes = table_group->pgsizes;
764 info.ddw.max_dynamic_windows_supported =
765 table_group->max_dynamic_windows_supported;
766 info.ddw.levels = table_group->max_levels;
767 }
768
769 ddwsz = offsetofend(struct vfio_iommu_spapr_tce_info, ddw);
770
771 if (info.argsz >= ddwsz)
772 minsz = ddwsz;
773
774 if (copy_to_user((void __user *)arg, &info, minsz))
775 return -EFAULT;
776
777 return 0;
778 }
779 case VFIO_IOMMU_MAP_DMA: {
780 struct vfio_iommu_type1_dma_map param;
781 struct iommu_table *tbl = NULL;
782 long num;
783 enum dma_data_direction direction;
784
785 if (!container->enabled)
786 return -EPERM;
787
788 minsz = offsetofend(struct vfio_iommu_type1_dma_map, size);
789
790 if (copy_from_user(&param, (void __user *)arg, minsz))
791 return -EFAULT;
792
793 if (param.argsz < minsz)
794 return -EINVAL;
795
796 if (param.flags & ~(VFIO_DMA_MAP_FLAG_READ |
797 VFIO_DMA_MAP_FLAG_WRITE))
798 return -EINVAL;
799
800 num = tce_iommu_find_table(container, param.iova, &tbl);
801 if (num < 0)
802 return -ENXIO;
803
804 if ((param.size & ~IOMMU_PAGE_MASK(tbl)) ||
805 (param.vaddr & ~IOMMU_PAGE_MASK(tbl)))
806 return -EINVAL;
807
808 /* iova is checked by the IOMMU API */
809 if (param.flags & VFIO_DMA_MAP_FLAG_READ) {
810 if (param.flags & VFIO_DMA_MAP_FLAG_WRITE)
811 direction = DMA_BIDIRECTIONAL;
812 else
813 direction = DMA_TO_DEVICE;
814 } else {
815 if (param.flags & VFIO_DMA_MAP_FLAG_WRITE)
816 direction = DMA_FROM_DEVICE;
817 else
818 return -EINVAL;
819 }
820
821 ret = iommu_tce_put_param_check(tbl, param.iova, param.vaddr);
822 if (ret)
823 return ret;
824
825 if (container->v2)
826 ret = tce_iommu_build_v2(container, tbl,
827 param.iova >> tbl->it_page_shift,
828 param.vaddr,
829 param.size >> tbl->it_page_shift,
830 direction);
831 else
832 ret = tce_iommu_build(container, tbl,
833 param.iova >> tbl->it_page_shift,
834 param.vaddr,
835 param.size >> tbl->it_page_shift,
836 direction);
837
838 iommu_flush_tce(tbl);
839
840 return ret;
841 }
842 case VFIO_IOMMU_UNMAP_DMA: {
843 struct vfio_iommu_type1_dma_unmap param;
844 struct iommu_table *tbl = NULL;
845 long num;
846
847 if (!container->enabled)
848 return -EPERM;
849
850 minsz = offsetofend(struct vfio_iommu_type1_dma_unmap,
851 size);
852
853 if (copy_from_user(&param, (void __user *)arg, minsz))
854 return -EFAULT;
855
856 if (param.argsz < minsz)
857 return -EINVAL;
858
859 /* No flag is supported now */
860 if (param.flags)
861 return -EINVAL;
862
863 num = tce_iommu_find_table(container, param.iova, &tbl);
864 if (num < 0)
865 return -ENXIO;
866
867 if (param.size & ~IOMMU_PAGE_MASK(tbl))
868 return -EINVAL;
869
870 ret = iommu_tce_clear_param_check(tbl, param.iova, 0,
871 param.size >> tbl->it_page_shift);
872 if (ret)
873 return ret;
874
875 ret = tce_iommu_clear(container, tbl,
876 param.iova >> tbl->it_page_shift,
877 param.size >> tbl->it_page_shift);
878 iommu_flush_tce(tbl);
879
880 return ret;
881 }
882 case VFIO_IOMMU_SPAPR_REGISTER_MEMORY: {
883 struct vfio_iommu_spapr_register_memory param;
884
885 if (!container->v2)
886 break;
887
888 minsz = offsetofend(struct vfio_iommu_spapr_register_memory,
889 size);
890
891 if (copy_from_user(&param, (void __user *)arg, minsz))
892 return -EFAULT;
893
894 if (param.argsz < minsz)
895 return -EINVAL;
896
897 /* No flag is supported now */
898 if (param.flags)
899 return -EINVAL;
900
901 mutex_lock(&container->lock);
902 ret = tce_iommu_register_pages(container, param.vaddr,
903 param.size);
904 mutex_unlock(&container->lock);
905
906 return ret;
907 }
908 case VFIO_IOMMU_SPAPR_UNREGISTER_MEMORY: {
909 struct vfio_iommu_spapr_register_memory param;
910
911 if (!container->v2)
912 break;
913
914 minsz = offsetofend(struct vfio_iommu_spapr_register_memory,
915 size);
916
917 if (copy_from_user(&param, (void __user *)arg, minsz))
918 return -EFAULT;
919
920 if (param.argsz < minsz)
921 return -EINVAL;
922
923 /* No flag is supported now */
924 if (param.flags)
925 return -EINVAL;
926
927 mutex_lock(&container->lock);
928 ret = tce_iommu_unregister_pages(container, param.vaddr,
929 param.size);
930 mutex_unlock(&container->lock);
931
932 return ret;
933 }
934 case VFIO_IOMMU_ENABLE:
935 if (container->v2)
936 break;
937
938 mutex_lock(&container->lock);
939 ret = tce_iommu_enable(container);
940 mutex_unlock(&container->lock);
941 return ret;
942
943
944 case VFIO_IOMMU_DISABLE:
945 if (container->v2)
946 break;
947
948 mutex_lock(&container->lock);
949 tce_iommu_disable(container);
950 mutex_unlock(&container->lock);
951 return 0;
952
953 case VFIO_EEH_PE_OP: {
954 struct tce_iommu_group *tcegrp;
955
956 ret = 0;
957 list_for_each_entry(tcegrp, &container->group_list, next) {
958 ret = vfio_spapr_iommu_eeh_ioctl(tcegrp->grp,
959 cmd, arg);
960 if (ret)
961 return ret;
962 }
963 return ret;
964 }
965
966 case VFIO_IOMMU_SPAPR_TCE_CREATE: {
967 struct vfio_iommu_spapr_tce_create create;
968
969 if (!container->v2)
970 break;
971
972 if (!tce_groups_attached(container))
973 return -ENXIO;
974
975 minsz = offsetofend(struct vfio_iommu_spapr_tce_create,
976 start_addr);
977
978 if (copy_from_user(&create, (void __user *)arg, minsz))
979 return -EFAULT;
980
981 if (create.argsz < minsz)
982 return -EINVAL;
983
984 if (create.flags)
985 return -EINVAL;
986
987 mutex_lock(&container->lock);
988
989 ret = tce_iommu_create_window(container, create.page_shift,
990 create.window_size, create.levels,
991 &create.start_addr);
992
993 mutex_unlock(&container->lock);
994
995 if (!ret && copy_to_user((void __user *)arg, &create, minsz))
996 ret = -EFAULT;
997
998 return ret;
999 }
1000 case VFIO_IOMMU_SPAPR_TCE_REMOVE: {
1001 struct vfio_iommu_spapr_tce_remove remove;
1002
1003 if (!container->v2)
1004 break;
1005
1006 if (!tce_groups_attached(container))
1007 return -ENXIO;
1008
1009 minsz = offsetofend(struct vfio_iommu_spapr_tce_remove,
1010 start_addr);
1011
1012 if (copy_from_user(&remove, (void __user *)arg, minsz))
1013 return -EFAULT;
1014
1015 if (remove.argsz < minsz)
1016 return -EINVAL;
1017
1018 if (remove.flags)
1019 return -EINVAL;
1020
1021 mutex_lock(&container->lock);
1022
1023 ret = tce_iommu_remove_window(container, remove.start_addr);
1024
1025 mutex_unlock(&container->lock);
1026
1027 return ret;
1028 }
1029 }
1030
1031 return -ENOTTY;
1032 }
1033
1034 static void tce_iommu_release_ownership(struct tce_container *container,
1035 struct iommu_table_group *table_group)
1036 {
1037 int i;
1038
1039 for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
1040 struct iommu_table *tbl = container->tables[i];
1041
1042 if (!tbl)
1043 continue;
1044
1045 tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size);
1046 tce_iommu_userspace_view_free(tbl);
1047 if (tbl->it_map)
1048 iommu_release_ownership(tbl);
1049
1050 container->tables[i] = NULL;
1051 }
1052 }
1053
1054 static int tce_iommu_take_ownership(struct tce_container *container,
1055 struct iommu_table_group *table_group)
1056 {
1057 int i, j, rc = 0;
1058
1059 for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
1060 struct iommu_table *tbl = table_group->tables[i];
1061
1062 if (!tbl || !tbl->it_map)
1063 continue;
1064
1065 rc = tce_iommu_userspace_view_alloc(tbl);
1066 if (!rc)
1067 rc = iommu_take_ownership(tbl);
1068
1069 if (rc) {
1070 for (j = 0; j < i; ++j)
1071 iommu_release_ownership(
1072 table_group->tables[j]);
1073
1074 return rc;
1075 }
1076 }
1077
1078 for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i)
1079 container->tables[i] = table_group->tables[i];
1080
1081 return 0;
1082 }
1083
1084 static void tce_iommu_release_ownership_ddw(struct tce_container *container,
1085 struct iommu_table_group *table_group)
1086 {
1087 long i;
1088
1089 if (!table_group->ops->unset_window) {
1090 WARN_ON_ONCE(1);
1091 return;
1092 }
1093
1094 for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i)
1095 table_group->ops->unset_window(table_group, i);
1096
1097 table_group->ops->release_ownership(table_group);
1098 }
1099
1100 static long tce_iommu_take_ownership_ddw(struct tce_container *container,
1101 struct iommu_table_group *table_group)
1102 {
1103 long i, ret = 0;
1104 struct iommu_table *tbl = NULL;
1105
1106 if (!table_group->ops->create_table || !table_group->ops->set_window ||
1107 !table_group->ops->release_ownership) {
1108 WARN_ON_ONCE(1);
1109 return -EFAULT;
1110 }
1111
1112 table_group->ops->take_ownership(table_group);
1113
1114 /*
1115 * If it the first group attached, check if there is
1116 * a default DMA window and create one if none as
1117 * the userspace expects it to exist.
1118 */
1119 if (!tce_groups_attached(container) && !container->tables[0]) {
1120 ret = tce_iommu_create_table(container,
1121 table_group,
1122 0, /* window number */
1123 IOMMU_PAGE_SHIFT_4K,
1124 table_group->tce32_size,
1125 1, /* default levels */
1126 &tbl);
1127 if (ret)
1128 goto release_exit;
1129 else
1130 container->tables[0] = tbl;
1131 }
1132
1133 /* Set all windows to the new group */
1134 for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
1135 tbl = container->tables[i];
1136
1137 if (!tbl)
1138 continue;
1139
1140 /* Set the default window to a new group */
1141 ret = table_group->ops->set_window(table_group, i, tbl);
1142 if (ret)
1143 goto release_exit;
1144 }
1145
1146 return 0;
1147
1148 release_exit:
1149 for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i)
1150 table_group->ops->unset_window(table_group, i);
1151
1152 table_group->ops->release_ownership(table_group);
1153
1154 return ret;
1155 }
1156
1157 static int tce_iommu_attach_group(void *iommu_data,
1158 struct iommu_group *iommu_group)
1159 {
1160 int ret;
1161 struct tce_container *container = iommu_data;
1162 struct iommu_table_group *table_group;
1163 struct tce_iommu_group *tcegrp = NULL;
1164
1165 mutex_lock(&container->lock);
1166
1167 /* pr_debug("tce_vfio: Attaching group #%u to iommu %p\n",
1168 iommu_group_id(iommu_group), iommu_group); */
1169 table_group = iommu_group_get_iommudata(iommu_group);
1170
1171 if (tce_groups_attached(container) && (!table_group->ops ||
1172 !table_group->ops->take_ownership ||
1173 !table_group->ops->release_ownership)) {
1174 ret = -EBUSY;
1175 goto unlock_exit;
1176 }
1177
1178 /* Check if new group has the same iommu_ops (i.e. compatible) */
1179 list_for_each_entry(tcegrp, &container->group_list, next) {
1180 struct iommu_table_group *table_group_tmp;
1181
1182 if (tcegrp->grp == iommu_group) {
1183 pr_warn("tce_vfio: Group %d is already attached\n",
1184 iommu_group_id(iommu_group));
1185 ret = -EBUSY;
1186 goto unlock_exit;
1187 }
1188 table_group_tmp = iommu_group_get_iommudata(tcegrp->grp);
1189 if (table_group_tmp->ops->create_table !=
1190 table_group->ops->create_table) {
1191 pr_warn("tce_vfio: Group %d is incompatible with group %d\n",
1192 iommu_group_id(iommu_group),
1193 iommu_group_id(tcegrp->grp));
1194 ret = -EPERM;
1195 goto unlock_exit;
1196 }
1197 }
1198
1199 tcegrp = kzalloc(sizeof(*tcegrp), GFP_KERNEL);
1200 if (!tcegrp) {
1201 ret = -ENOMEM;
1202 goto unlock_exit;
1203 }
1204
1205 if (!table_group->ops || !table_group->ops->take_ownership ||
1206 !table_group->ops->release_ownership)
1207 ret = tce_iommu_take_ownership(container, table_group);
1208 else
1209 ret = tce_iommu_take_ownership_ddw(container, table_group);
1210
1211 if (!ret) {
1212 tcegrp->grp = iommu_group;
1213 list_add(&tcegrp->next, &container->group_list);
1214 }
1215
1216 unlock_exit:
1217 if (ret && tcegrp)
1218 kfree(tcegrp);
1219
1220 mutex_unlock(&container->lock);
1221
1222 return ret;
1223 }
1224
1225 static void tce_iommu_detach_group(void *iommu_data,
1226 struct iommu_group *iommu_group)
1227 {
1228 struct tce_container *container = iommu_data;
1229 struct iommu_table_group *table_group;
1230 bool found = false;
1231 struct tce_iommu_group *tcegrp;
1232
1233 mutex_lock(&container->lock);
1234
1235 list_for_each_entry(tcegrp, &container->group_list, next) {
1236 if (tcegrp->grp == iommu_group) {
1237 found = true;
1238 break;
1239 }
1240 }
1241
1242 if (!found) {
1243 pr_warn("tce_vfio: detaching unattached group #%u\n",
1244 iommu_group_id(iommu_group));
1245 goto unlock_exit;
1246 }
1247
1248 list_del(&tcegrp->next);
1249 kfree(tcegrp);
1250
1251 table_group = iommu_group_get_iommudata(iommu_group);
1252 BUG_ON(!table_group);
1253
1254 if (!table_group->ops || !table_group->ops->release_ownership)
1255 tce_iommu_release_ownership(container, table_group);
1256 else
1257 tce_iommu_release_ownership_ddw(container, table_group);
1258
1259 unlock_exit:
1260 mutex_unlock(&container->lock);
1261 }
1262
1263 const struct vfio_iommu_driver_ops tce_iommu_driver_ops = {
1264 .name = "iommu-vfio-powerpc",
1265 .owner = THIS_MODULE,
1266 .open = tce_iommu_open,
1267 .release = tce_iommu_release,
1268 .ioctl = tce_iommu_ioctl,
1269 .attach_group = tce_iommu_attach_group,
1270 .detach_group = tce_iommu_detach_group,
1271 };
1272
1273 static int __init tce_iommu_init(void)
1274 {
1275 return vfio_register_iommu_driver(&tce_iommu_driver_ops);
1276 }
1277
1278 static void __exit tce_iommu_cleanup(void)
1279 {
1280 vfio_unregister_iommu_driver(&tce_iommu_driver_ops);
1281 }
1282
1283 module_init(tce_iommu_init);
1284 module_exit(tce_iommu_cleanup);
1285
1286 MODULE_VERSION(DRIVER_VERSION);
1287 MODULE_LICENSE("GPL v2");
1288 MODULE_AUTHOR(DRIVER_AUTHOR);
1289 MODULE_DESCRIPTION(DRIVER_DESC);
1290
Linux with added FPC-III support