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PM / sleep: Asynchronous threads for suspend_noirq
[linux/fpc-iii.git] / drivers / gpu / drm / i915 / i915_gem_execbuffer.c
blobd269ecf46e264cbaaef6c9e1db6ddcfb57f1424d
1 /*
2 * Copyright © 2008,2010 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 *
23 * Authors:
24 * Eric Anholt <eric@anholt.net>
25 * Chris Wilson <chris@chris-wilson.co.uk>
26 *
27 */
28
29 #include <drm/drmP.h>
30 #include <drm/i915_drm.h>
31 #include "i915_drv.h"
32 #include "i915_trace.h"
33 #include "intel_drv.h"
34 #include <linux/dma_remapping.h>
35
36 #define __EXEC_OBJECT_HAS_PIN (1<<31)
37 #define __EXEC_OBJECT_HAS_FENCE (1<<30)
38
39 struct eb_vmas {
40 struct list_head vmas;
41 int and;
42 union {
43 struct i915_vma *lut[0];
44 struct hlist_head buckets[0];
45 };
46 };
47
48 static struct eb_vmas *
49 eb_create(struct drm_i915_gem_execbuffer2 *args)
50 {
51 struct eb_vmas *eb = NULL;
52
53 if (args->flags & I915_EXEC_HANDLE_LUT) {
54 unsigned size = args->buffer_count;
55 size *= sizeof(struct i915_vma *);
56 size += sizeof(struct eb_vmas);
57 eb = kmalloc(size, GFP_TEMPORARY | __GFP_NOWARN | __GFP_NORETRY);
58 }
59
60 if (eb == NULL) {
61 unsigned size = args->buffer_count;
62 unsigned count = PAGE_SIZE / sizeof(struct hlist_head) / 2;
63 BUILD_BUG_ON_NOT_POWER_OF_2(PAGE_SIZE / sizeof(struct hlist_head));
64 while (count > 2*size)
65 count >>= 1;
66 eb = kzalloc(count*sizeof(struct hlist_head) +
67 sizeof(struct eb_vmas),
68 GFP_TEMPORARY);
69 if (eb == NULL)
70 return eb;
71
72 eb->and = count - 1;
73 } else
74 eb->and = -args->buffer_count;
75
76 INIT_LIST_HEAD(&eb->vmas);
77 return eb;
78 }
79
80 static void
81 eb_reset(struct eb_vmas *eb)
82 {
83 if (eb->and >= 0)
84 memset(eb->buckets, 0, (eb->and+1)*sizeof(struct hlist_head));
85 }
86
87 static int
88 eb_lookup_vmas(struct eb_vmas *eb,
89 struct drm_i915_gem_exec_object2 *exec,
90 const struct drm_i915_gem_execbuffer2 *args,
91 struct i915_address_space *vm,
92 struct drm_file *file)
93 {
94 struct drm_i915_gem_object *obj;
95 struct list_head objects;
96 int i, ret;
97
98 INIT_LIST_HEAD(&objects);
99 spin_lock(&file->table_lock);
100 /* Grab a reference to the object and release the lock so we can lookup
101 * or create the VMA without using GFP_ATOMIC */
102 for (i = 0; i < args->buffer_count; i++) {
103 obj = to_intel_bo(idr_find(&file->object_idr, exec[i].handle));
104 if (obj == NULL) {
105 spin_unlock(&file->table_lock);
106 DRM_DEBUG("Invalid object handle %d at index %d\n",
107 exec[i].handle, i);
108 ret = -ENOENT;
109 goto err;
110 }
111
112 if (!list_empty(&obj->obj_exec_link)) {
113 spin_unlock(&file->table_lock);
114 DRM_DEBUG("Object %p [handle %d, index %d] appears more than once in object list\n",
115 obj, exec[i].handle, i);
116 ret = -EINVAL;
117 goto err;
118 }
119
120 drm_gem_object_reference(&obj->base);
121 list_add_tail(&obj->obj_exec_link, &objects);
122 }
123 spin_unlock(&file->table_lock);
124
125 i = 0;
126 while (!list_empty(&objects)) {
127 struct i915_vma *vma;
128
129 obj = list_first_entry(&objects,
130 struct drm_i915_gem_object,
131 obj_exec_link);
132
133 /*
134 * NOTE: We can leak any vmas created here when something fails
135 * later on. But that's no issue since vma_unbind can deal with
136 * vmas which are not actually bound. And since only
137 * lookup_or_create exists as an interface to get at the vma
138 * from the (obj, vm) we don't run the risk of creating
139 * duplicated vmas for the same vm.
140 */
141 vma = i915_gem_obj_lookup_or_create_vma(obj, vm);
142 if (IS_ERR(vma)) {
143 DRM_DEBUG("Failed to lookup VMA\n");
144 ret = PTR_ERR(vma);
145 goto err;
146 }
147
148 /* Transfer ownership from the objects list to the vmas list. */
149 list_add_tail(&vma->exec_list, &eb->vmas);
150 list_del_init(&obj->obj_exec_link);
151
152 vma->exec_entry = &exec[i];
153 if (eb->and < 0) {
154 eb->lut[i] = vma;
155 } else {
156 uint32_t handle = args->flags & I915_EXEC_HANDLE_LUT ? i : exec[i].handle;
157 vma->exec_handle = handle;
158 hlist_add_head(&vma->exec_node,
159 &eb->buckets[handle & eb->and]);
160 }
161 ++i;
162 }
163
164 return 0;
165
166
167 err:
168 while (!list_empty(&objects)) {
169 obj = list_first_entry(&objects,
170 struct drm_i915_gem_object,
171 obj_exec_link);
172 list_del_init(&obj->obj_exec_link);
173 drm_gem_object_unreference(&obj->base);
174 }
175 /*
176 * Objects already transfered to the vmas list will be unreferenced by
177 * eb_destroy.
178 */
179
180 return ret;
181 }
182
183 static struct i915_vma *eb_get_vma(struct eb_vmas *eb, unsigned long handle)
184 {
185 if (eb->and < 0) {
186 if (handle >= -eb->and)
187 return NULL;
188 return eb->lut[handle];
189 } else {
190 struct hlist_head *head;
191 struct hlist_node *node;
192
193 head = &eb->buckets[handle & eb->and];
194 hlist_for_each(node, head) {
195 struct i915_vma *vma;
196
197 vma = hlist_entry(node, struct i915_vma, exec_node);
198 if (vma->exec_handle == handle)
199 return vma;
200 }
201 return NULL;
202 }
203 }
204
205 static void
206 i915_gem_execbuffer_unreserve_vma(struct i915_vma *vma)
207 {
208 struct drm_i915_gem_exec_object2 *entry;
209 struct drm_i915_gem_object *obj = vma->obj;
210
211 if (!drm_mm_node_allocated(&vma->node))
212 return;
213
214 entry = vma->exec_entry;
215
216 if (entry->flags & __EXEC_OBJECT_HAS_FENCE)
217 i915_gem_object_unpin_fence(obj);
218
219 if (entry->flags & __EXEC_OBJECT_HAS_PIN)
220 i915_gem_object_unpin(obj);
221
222 entry->flags &= ~(__EXEC_OBJECT_HAS_FENCE | __EXEC_OBJECT_HAS_PIN);
223 }
224
225 static void eb_destroy(struct eb_vmas *eb)
226 {
227 while (!list_empty(&eb->vmas)) {
228 struct i915_vma *vma;
229
230 vma = list_first_entry(&eb->vmas,
231 struct i915_vma,
232 exec_list);
233 list_del_init(&vma->exec_list);
234 i915_gem_execbuffer_unreserve_vma(vma);
235 drm_gem_object_unreference(&vma->obj->base);
236 }
237 kfree(eb);
238 }
239
240 static inline int use_cpu_reloc(struct drm_i915_gem_object *obj)
241 {
242 return (HAS_LLC(obj->base.dev) ||
243 obj->base.write_domain == I915_GEM_DOMAIN_CPU ||
244 !obj->map_and_fenceable ||
245 obj->cache_level != I915_CACHE_NONE);
246 }
247
248 static int
249 relocate_entry_cpu(struct drm_i915_gem_object *obj,
250 struct drm_i915_gem_relocation_entry *reloc)
251 {
252 struct drm_device *dev = obj->base.dev;
253 uint32_t page_offset = offset_in_page(reloc->offset);
254 char *vaddr;
255 int ret;
256
257 ret = i915_gem_object_set_to_cpu_domain(obj, true);
258 if (ret)
259 return ret;
260
261 vaddr = kmap_atomic(i915_gem_object_get_page(obj,
262 reloc->offset >> PAGE_SHIFT));
263 *(uint32_t *)(vaddr + page_offset) = reloc->delta;
264
265 if (INTEL_INFO(dev)->gen >= 8) {
266 page_offset = offset_in_page(page_offset + sizeof(uint32_t));
267
268 if (page_offset == 0) {
269 kunmap_atomic(vaddr);
270 vaddr = kmap_atomic(i915_gem_object_get_page(obj,
271 (reloc->offset + sizeof(uint32_t)) >> PAGE_SHIFT));
272 }
273
274 *(uint32_t *)(vaddr + page_offset) = 0;
275 }
276
277 kunmap_atomic(vaddr);
278
279 return 0;
280 }
281
282 static int
283 relocate_entry_gtt(struct drm_i915_gem_object *obj,
284 struct drm_i915_gem_relocation_entry *reloc)
285 {
286 struct drm_device *dev = obj->base.dev;
287 struct drm_i915_private *dev_priv = dev->dev_private;
288 uint32_t __iomem *reloc_entry;
289 void __iomem *reloc_page;
290 int ret;
291
292 ret = i915_gem_object_set_to_gtt_domain(obj, true);
293 if (ret)
294 return ret;
295
296 ret = i915_gem_object_put_fence(obj);
297 if (ret)
298 return ret;
299
300 /* Map the page containing the relocation we're going to perform. */
301 reloc->offset += i915_gem_obj_ggtt_offset(obj);
302 reloc_page = io_mapping_map_atomic_wc(dev_priv->gtt.mappable,
303 reloc->offset & PAGE_MASK);
304 reloc_entry = (uint32_t __iomem *)
305 (reloc_page + offset_in_page(reloc->offset));
306 iowrite32(reloc->delta, reloc_entry);
307
308 if (INTEL_INFO(dev)->gen >= 8) {
309 reloc_entry += 1;
310
311 if (offset_in_page(reloc->offset + sizeof(uint32_t)) == 0) {
312 io_mapping_unmap_atomic(reloc_page);
313 reloc_page = io_mapping_map_atomic_wc(
314 dev_priv->gtt.mappable,
315 reloc->offset + sizeof(uint32_t));
316 reloc_entry = reloc_page;
317 }
318
319 iowrite32(0, reloc_entry);
320 }
321
322 io_mapping_unmap_atomic(reloc_page);
323
324 return 0;
325 }
326
327 static int
328 i915_gem_execbuffer_relocate_entry(struct drm_i915_gem_object *obj,
329 struct eb_vmas *eb,
330 struct drm_i915_gem_relocation_entry *reloc,
331 struct i915_address_space *vm)
332 {
333 struct drm_device *dev = obj->base.dev;
334 struct drm_gem_object *target_obj;
335 struct drm_i915_gem_object *target_i915_obj;
336 struct i915_vma *target_vma;
337 uint32_t target_offset;
338 int ret;
339
340 /* we've already hold a reference to all valid objects */
341 target_vma = eb_get_vma(eb, reloc->target_handle);
342 if (unlikely(target_vma == NULL))
343 return -ENOENT;
344 target_i915_obj = target_vma->obj;
345 target_obj = &target_vma->obj->base;
346
347 target_offset = target_vma->node.start;
348
349 /* Sandybridge PPGTT errata: We need a global gtt mapping for MI and
350 * pipe_control writes because the gpu doesn't properly redirect them
351 * through the ppgtt for non_secure batchbuffers. */
352 if (unlikely(IS_GEN6(dev) &&
353 reloc->write_domain == I915_GEM_DOMAIN_INSTRUCTION &&
354 !target_i915_obj->has_global_gtt_mapping)) {
355 i915_gem_gtt_bind_object(target_i915_obj,
356 target_i915_obj->cache_level);
357 }
358
359 /* Validate that the target is in a valid r/w GPU domain */
360 if (unlikely(reloc->write_domain & (reloc->write_domain - 1))) {
361 DRM_DEBUG("reloc with multiple write domains: "
362 "obj %p target %d offset %d "
363 "read %08x write %08x",
364 obj, reloc->target_handle,
365 (int) reloc->offset,
366 reloc->read_domains,
367 reloc->write_domain);
368 return -EINVAL;
369 }
370 if (unlikely((reloc->write_domain | reloc->read_domains)
371 & ~I915_GEM_GPU_DOMAINS)) {
372 DRM_DEBUG("reloc with read/write non-GPU domains: "
373 "obj %p target %d offset %d "
374 "read %08x write %08x",
375 obj, reloc->target_handle,
376 (int) reloc->offset,
377 reloc->read_domains,
378 reloc->write_domain);
379 return -EINVAL;
380 }
381
382 target_obj->pending_read_domains |= reloc->read_domains;
383 target_obj->pending_write_domain |= reloc->write_domain;
384
385 /* If the relocation already has the right value in it, no
386 * more work needs to be done.
387 */
388 if (target_offset == reloc->presumed_offset)
389 return 0;
390
391 /* Check that the relocation address is valid... */
392 if (unlikely(reloc->offset >
393 obj->base.size - (INTEL_INFO(dev)->gen >= 8 ? 8 : 4))) {
394 DRM_DEBUG("Relocation beyond object bounds: "
395 "obj %p target %d offset %d size %d.\n",
396 obj, reloc->target_handle,
397 (int) reloc->offset,
398 (int) obj->base.size);
399 return -EINVAL;
400 }
401 if (unlikely(reloc->offset & 3)) {
402 DRM_DEBUG("Relocation not 4-byte aligned: "
403 "obj %p target %d offset %d.\n",
404 obj, reloc->target_handle,
405 (int) reloc->offset);
406 return -EINVAL;
407 }
408
409 /* We can't wait for rendering with pagefaults disabled */
410 if (obj->active && in_atomic())
411 return -EFAULT;
412
413 reloc->delta += target_offset;
414 if (use_cpu_reloc(obj))
415 ret = relocate_entry_cpu(obj, reloc);
416 else
417 ret = relocate_entry_gtt(obj, reloc);
418
419 if (ret)
420 return ret;
421
422 /* and update the user's relocation entry */
423 reloc->presumed_offset = target_offset;
424
425 return 0;
426 }
427
428 static int
429 i915_gem_execbuffer_relocate_vma(struct i915_vma *vma,
430 struct eb_vmas *eb)
431 {
432 #define N_RELOC(x) ((x) / sizeof(struct drm_i915_gem_relocation_entry))
433 struct drm_i915_gem_relocation_entry stack_reloc[N_RELOC(512)];
434 struct drm_i915_gem_relocation_entry __user *user_relocs;
435 struct drm_i915_gem_exec_object2 *entry = vma->exec_entry;
436 int remain, ret;
437
438 user_relocs = to_user_ptr(entry->relocs_ptr);
439
440 remain = entry->relocation_count;
441 while (remain) {
442 struct drm_i915_gem_relocation_entry *r = stack_reloc;
443 int count = remain;
444 if (count > ARRAY_SIZE(stack_reloc))
445 count = ARRAY_SIZE(stack_reloc);
446 remain -= count;
447
448 if (__copy_from_user_inatomic(r, user_relocs, count*sizeof(r[0])))
449 return -EFAULT;
450
451 do {
452 u64 offset = r->presumed_offset;
453
454 ret = i915_gem_execbuffer_relocate_entry(vma->obj, eb, r,
455 vma->vm);
456 if (ret)
457 return ret;
458
459 if (r->presumed_offset != offset &&
460 __copy_to_user_inatomic(&user_relocs->presumed_offset,
461 &r->presumed_offset,
462 sizeof(r->presumed_offset))) {
463 return -EFAULT;
464 }
465
466 user_relocs++;
467 r++;
468 } while (--count);
469 }
470
471 return 0;
472 #undef N_RELOC
473 }
474
475 static int
476 i915_gem_execbuffer_relocate_vma_slow(struct i915_vma *vma,
477 struct eb_vmas *eb,
478 struct drm_i915_gem_relocation_entry *relocs)
479 {
480 const struct drm_i915_gem_exec_object2 *entry = vma->exec_entry;
481 int i, ret;
482
483 for (i = 0; i < entry->relocation_count; i++) {
484 ret = i915_gem_execbuffer_relocate_entry(vma->obj, eb, &relocs[i],
485 vma->vm);
486 if (ret)
487 return ret;
488 }
489
490 return 0;
491 }
492
493 static int
494 i915_gem_execbuffer_relocate(struct eb_vmas *eb)
495 {
496 struct i915_vma *vma;
497 int ret = 0;
498
499 /* This is the fast path and we cannot handle a pagefault whilst
500 * holding the struct mutex lest the user pass in the relocations
501 * contained within a mmaped bo. For in such a case we, the page
502 * fault handler would call i915_gem_fault() and we would try to
503 * acquire the struct mutex again. Obviously this is bad and so
504 * lockdep complains vehemently.
505 */
506 pagefault_disable();
507 list_for_each_entry(vma, &eb->vmas, exec_list) {
508 ret = i915_gem_execbuffer_relocate_vma(vma, eb);
509 if (ret)
510 break;
511 }
512 pagefault_enable();
513
514 return ret;
515 }
516
517 static int
518 need_reloc_mappable(struct i915_vma *vma)
519 {
520 struct drm_i915_gem_exec_object2 *entry = vma->exec_entry;
521 return entry->relocation_count && !use_cpu_reloc(vma->obj) &&
522 i915_is_ggtt(vma->vm);
523 }
524
525 static int
526 i915_gem_execbuffer_reserve_vma(struct i915_vma *vma,
527 struct intel_ring_buffer *ring,
528 bool *need_reloc)
529 {
530 struct drm_i915_private *dev_priv = ring->dev->dev_private;
531 struct drm_i915_gem_exec_object2 *entry = vma->exec_entry;
532 bool has_fenced_gpu_access = INTEL_INFO(ring->dev)->gen < 4;
533 bool need_fence, need_mappable;
534 struct drm_i915_gem_object *obj = vma->obj;
535 int ret;
536
537 need_fence =
538 has_fenced_gpu_access &&
539 entry->flags & EXEC_OBJECT_NEEDS_FENCE &&
540 obj->tiling_mode != I915_TILING_NONE;
541 need_mappable = need_fence || need_reloc_mappable(vma);
542
543 ret = i915_gem_object_pin(obj, vma->vm, entry->alignment, need_mappable,
544 false);
545 if (ret)
546 return ret;
547
548 entry->flags |= __EXEC_OBJECT_HAS_PIN;
549
550 if (has_fenced_gpu_access) {
551 if (entry->flags & EXEC_OBJECT_NEEDS_FENCE) {
552 ret = i915_gem_object_get_fence(obj);
553 if (ret)
554 return ret;
555
556 if (i915_gem_object_pin_fence(obj))
557 entry->flags |= __EXEC_OBJECT_HAS_FENCE;
558
559 obj->pending_fenced_gpu_access = true;
560 }
561 }
562
563 /* Ensure ppgtt mapping exists if needed */
564 if (dev_priv->mm.aliasing_ppgtt && !obj->has_aliasing_ppgtt_mapping) {
565 i915_ppgtt_bind_object(dev_priv->mm.aliasing_ppgtt,
566 obj, obj->cache_level);
567
568 obj->has_aliasing_ppgtt_mapping = 1;
569 }
570
571 if (entry->offset != vma->node.start) {
572 entry->offset = vma->node.start;
573 *need_reloc = true;
574 }
575
576 if (entry->flags & EXEC_OBJECT_WRITE) {
577 obj->base.pending_read_domains = I915_GEM_DOMAIN_RENDER;
578 obj->base.pending_write_domain = I915_GEM_DOMAIN_RENDER;
579 }
580
581 if (entry->flags & EXEC_OBJECT_NEEDS_GTT &&
582 !obj->has_global_gtt_mapping)
583 i915_gem_gtt_bind_object(obj, obj->cache_level);
584
585 return 0;
586 }
587
588 static int
589 i915_gem_execbuffer_reserve(struct intel_ring_buffer *ring,
590 struct list_head *vmas,
591 bool *need_relocs)
592 {
593 struct drm_i915_gem_object *obj;
594 struct i915_vma *vma;
595 struct i915_address_space *vm;
596 struct list_head ordered_vmas;
597 bool has_fenced_gpu_access = INTEL_INFO(ring->dev)->gen < 4;
598 int retry;
599
600 if (list_empty(vmas))
601 return 0;
602
603 vm = list_first_entry(vmas, struct i915_vma, exec_list)->vm;
604
605 INIT_LIST_HEAD(&ordered_vmas);
606 while (!list_empty(vmas)) {
607 struct drm_i915_gem_exec_object2 *entry;
608 bool need_fence, need_mappable;
609
610 vma = list_first_entry(vmas, struct i915_vma, exec_list);
611 obj = vma->obj;
612 entry = vma->exec_entry;
613
614 need_fence =
615 has_fenced_gpu_access &&
616 entry->flags & EXEC_OBJECT_NEEDS_FENCE &&
617 obj->tiling_mode != I915_TILING_NONE;
618 need_mappable = need_fence || need_reloc_mappable(vma);
619
620 if (need_mappable)
621 list_move(&vma->exec_list, &ordered_vmas);
622 else
623 list_move_tail(&vma->exec_list, &ordered_vmas);
624
625 obj->base.pending_read_domains = I915_GEM_GPU_DOMAINS & ~I915_GEM_DOMAIN_COMMAND;
626 obj->base.pending_write_domain = 0;
627 obj->pending_fenced_gpu_access = false;
628 }
629 list_splice(&ordered_vmas, vmas);
630
631 /* Attempt to pin all of the buffers into the GTT.
632 * This is done in 3 phases:
633 *
634 * 1a. Unbind all objects that do not match the GTT constraints for
635 * the execbuffer (fenceable, mappable, alignment etc).
636 * 1b. Increment pin count for already bound objects.
637 * 2. Bind new objects.
638 * 3. Decrement pin count.
639 *
640 * This avoid unnecessary unbinding of later objects in order to make
641 * room for the earlier objects *unless* we need to defragment.
642 */
643 retry = 0;
644 do {
645 int ret = 0;
646
647 /* Unbind any ill-fitting objects or pin. */
648 list_for_each_entry(vma, vmas, exec_list) {
649 struct drm_i915_gem_exec_object2 *entry = vma->exec_entry;
650 bool need_fence, need_mappable;
651
652 obj = vma->obj;
653
654 if (!drm_mm_node_allocated(&vma->node))
655 continue;
656
657 need_fence =
658 has_fenced_gpu_access &&
659 entry->flags & EXEC_OBJECT_NEEDS_FENCE &&
660 obj->tiling_mode != I915_TILING_NONE;
661 need_mappable = need_fence || need_reloc_mappable(vma);
662
663 WARN_ON((need_mappable || need_fence) &&
664 !i915_is_ggtt(vma->vm));
665
666 if ((entry->alignment &&
667 vma->node.start & (entry->alignment - 1)) ||
668 (need_mappable && !obj->map_and_fenceable))
669 ret = i915_vma_unbind(vma);
670 else
671 ret = i915_gem_execbuffer_reserve_vma(vma, ring, need_relocs);
672 if (ret)
673 goto err;
674 }
675
676 /* Bind fresh objects */
677 list_for_each_entry(vma, vmas, exec_list) {
678 if (drm_mm_node_allocated(&vma->node))
679 continue;
680
681 ret = i915_gem_execbuffer_reserve_vma(vma, ring, need_relocs);
682 if (ret)
683 goto err;
684 }
685
686 err:
687 if (ret != -ENOSPC || retry++)
688 return ret;
689
690 /* Decrement pin count for bound objects */
691 list_for_each_entry(vma, vmas, exec_list)
692 i915_gem_execbuffer_unreserve_vma(vma);
693
694 ret = i915_gem_evict_vm(vm, true);
695 if (ret)
696 return ret;
697 } while (1);
698 }
699
700 static int
701 i915_gem_execbuffer_relocate_slow(struct drm_device *dev,
702 struct drm_i915_gem_execbuffer2 *args,
703 struct drm_file *file,
704 struct intel_ring_buffer *ring,
705 struct eb_vmas *eb,
706 struct drm_i915_gem_exec_object2 *exec)
707 {
708 struct drm_i915_gem_relocation_entry *reloc;
709 struct i915_address_space *vm;
710 struct i915_vma *vma;
711 bool need_relocs;
712 int *reloc_offset;
713 int i, total, ret;
714 unsigned count = args->buffer_count;
715
716 if (WARN_ON(list_empty(&eb->vmas)))
717 return 0;
718
719 vm = list_first_entry(&eb->vmas, struct i915_vma, exec_list)->vm;
720
721 /* We may process another execbuffer during the unlock... */
722 while (!list_empty(&eb->vmas)) {
723 vma = list_first_entry(&eb->vmas, struct i915_vma, exec_list);
724 list_del_init(&vma->exec_list);
725 i915_gem_execbuffer_unreserve_vma(vma);
726 drm_gem_object_unreference(&vma->obj->base);
727 }
728
729 mutex_unlock(&dev->struct_mutex);
730
731 total = 0;
732 for (i = 0; i < count; i++)
733 total += exec[i].relocation_count;
734
735 reloc_offset = drm_malloc_ab(count, sizeof(*reloc_offset));
736 reloc = drm_malloc_ab(total, sizeof(*reloc));
737 if (reloc == NULL || reloc_offset == NULL) {
738 drm_free_large(reloc);
739 drm_free_large(reloc_offset);
740 mutex_lock(&dev->struct_mutex);
741 return -ENOMEM;
742 }
743
744 total = 0;
745 for (i = 0; i < count; i++) {
746 struct drm_i915_gem_relocation_entry __user *user_relocs;
747 u64 invalid_offset = (u64)-1;
748 int j;
749
750 user_relocs = to_user_ptr(exec[i].relocs_ptr);
751
752 if (copy_from_user(reloc+total, user_relocs,
753 exec[i].relocation_count * sizeof(*reloc))) {
754 ret = -EFAULT;
755 mutex_lock(&dev->struct_mutex);
756 goto err;
757 }
758
759 /* As we do not update the known relocation offsets after
760 * relocating (due to the complexities in lock handling),
761 * we need to mark them as invalid now so that we force the
762 * relocation processing next time. Just in case the target
763 * object is evicted and then rebound into its old
764 * presumed_offset before the next execbuffer - if that
765 * happened we would make the mistake of assuming that the
766 * relocations were valid.
767 */
768 for (j = 0; j < exec[i].relocation_count; j++) {
769 if (copy_to_user(&user_relocs[j].presumed_offset,
770 &invalid_offset,
771 sizeof(invalid_offset))) {
772 ret = -EFAULT;
773 mutex_lock(&dev->struct_mutex);
774 goto err;
775 }
776 }
777
778 reloc_offset[i] = total;
779 total += exec[i].relocation_count;
780 }
781
782 ret = i915_mutex_lock_interruptible(dev);
783 if (ret) {
784 mutex_lock(&dev->struct_mutex);
785 goto err;
786 }
787
788 /* reacquire the objects */
789 eb_reset(eb);
790 ret = eb_lookup_vmas(eb, exec, args, vm, file);
791 if (ret)
792 goto err;
793
794 need_relocs = (args->flags & I915_EXEC_NO_RELOC) == 0;
795 ret = i915_gem_execbuffer_reserve(ring, &eb->vmas, &need_relocs);
796 if (ret)
797 goto err;
798
799 list_for_each_entry(vma, &eb->vmas, exec_list) {
800 int offset = vma->exec_entry - exec;
801 ret = i915_gem_execbuffer_relocate_vma_slow(vma, eb,
802 reloc + reloc_offset[offset]);
803 if (ret)
804 goto err;
805 }
806
807 /* Leave the user relocations as are, this is the painfully slow path,
808 * and we want to avoid the complication of dropping the lock whilst
809 * having buffers reserved in the aperture and so causing spurious
810 * ENOSPC for random operations.
811 */
812
813 err:
814 drm_free_large(reloc);
815 drm_free_large(reloc_offset);
816 return ret;
817 }
818
819 static int
820 i915_gem_execbuffer_move_to_gpu(struct intel_ring_buffer *ring,
821 struct list_head *vmas)
822 {
823 struct i915_vma *vma;
824 uint32_t flush_domains = 0;
825 bool flush_chipset = false;
826 int ret;
827
828 list_for_each_entry(vma, vmas, exec_list) {
829 struct drm_i915_gem_object *obj = vma->obj;
830 ret = i915_gem_object_sync(obj, ring);
831 if (ret)
832 return ret;
833
834 if (obj->base.write_domain & I915_GEM_DOMAIN_CPU)
835 flush_chipset |= i915_gem_clflush_object(obj, false);
836
837 flush_domains |= obj->base.write_domain;
838 }
839
840 if (flush_chipset)
841 i915_gem_chipset_flush(ring->dev);
842
843 if (flush_domains & I915_GEM_DOMAIN_GTT)
844 wmb();
845
846 /* Unconditionally invalidate gpu caches and ensure that we do flush
847 * any residual writes from the previous batch.
848 */
849 return intel_ring_invalidate_all_caches(ring);
850 }
851
852 static bool
853 i915_gem_check_execbuffer(struct drm_i915_gem_execbuffer2 *exec)
854 {
855 if (exec->flags & __I915_EXEC_UNKNOWN_FLAGS)
856 return false;
857
858 return ((exec->batch_start_offset | exec->batch_len) & 0x7) == 0;
859 }
860
861 static int
862 validate_exec_list(struct drm_i915_gem_exec_object2 *exec,
863 int count)
864 {
865 int i;
866 unsigned relocs_total = 0;
867 unsigned relocs_max = UINT_MAX / sizeof(struct drm_i915_gem_relocation_entry);
868
869 for (i = 0; i < count; i++) {
870 char __user *ptr = to_user_ptr(exec[i].relocs_ptr);
871 int length; /* limited by fault_in_pages_readable() */
872
873 if (exec[i].flags & __EXEC_OBJECT_UNKNOWN_FLAGS)
874 return -EINVAL;
875
876 /* First check for malicious input causing overflow in
877 * the worst case where we need to allocate the entire
878 * relocation tree as a single array.
879 */
880 if (exec[i].relocation_count > relocs_max - relocs_total)
881 return -EINVAL;
882 relocs_total += exec[i].relocation_count;
883
884 length = exec[i].relocation_count *
885 sizeof(struct drm_i915_gem_relocation_entry);
886 /*
887 * We must check that the entire relocation array is safe
888 * to read, but since we may need to update the presumed
889 * offsets during execution, check for full write access.
890 */
891 if (!access_ok(VERIFY_WRITE, ptr, length))
892 return -EFAULT;
893
894 if (likely(!i915_prefault_disable)) {
895 if (fault_in_multipages_readable(ptr, length))
896 return -EFAULT;
897 }
898 }
899
900 return 0;
901 }
902
903 static int
904 i915_gem_validate_context(struct drm_device *dev, struct drm_file *file,
905 const u32 ctx_id)
906 {
907 struct i915_ctx_hang_stats *hs;
908
909 hs = i915_gem_context_get_hang_stats(dev, file, ctx_id);
910 if (IS_ERR(hs))
911 return PTR_ERR(hs);
912
913 if (hs->banned) {
914 DRM_DEBUG("Context %u tried to submit while banned\n", ctx_id);
915 return -EIO;
916 }
917
918 return 0;
919 }
920
921 static void
922 i915_gem_execbuffer_move_to_active(struct list_head *vmas,
923 struct intel_ring_buffer *ring)
924 {
925 struct i915_vma *vma;
926
927 list_for_each_entry(vma, vmas, exec_list) {
928 struct drm_i915_gem_object *obj = vma->obj;
929 u32 old_read = obj->base.read_domains;
930 u32 old_write = obj->base.write_domain;
931
932 obj->base.write_domain = obj->base.pending_write_domain;
933 if (obj->base.write_domain == 0)
934 obj->base.pending_read_domains |= obj->base.read_domains;
935 obj->base.read_domains = obj->base.pending_read_domains;
936 obj->fenced_gpu_access = obj->pending_fenced_gpu_access;
937
938 i915_vma_move_to_active(vma, ring);
939 if (obj->base.write_domain) {
940 obj->dirty = 1;
941 obj->last_write_seqno = intel_ring_get_seqno(ring);
942 if (obj->pin_count) /* check for potential scanout */
943 intel_mark_fb_busy(obj, ring);
944 }
945
946 trace_i915_gem_object_change_domain(obj, old_read, old_write);
947 }
948 }
949
950 static void
951 i915_gem_execbuffer_retire_commands(struct drm_device *dev,
952 struct drm_file *file,
953 struct intel_ring_buffer *ring,
954 struct drm_i915_gem_object *obj)
955 {
956 /* Unconditionally force add_request to emit a full flush. */
957 ring->gpu_caches_dirty = true;
958
959 /* Add a breadcrumb for the completion of the batch buffer */
960 (void)__i915_add_request(ring, file, obj, NULL);
961 }
962
963 static int
964 i915_reset_gen7_sol_offsets(struct drm_device *dev,
965 struct intel_ring_buffer *ring)
966 {
967 drm_i915_private_t *dev_priv = dev->dev_private;
968 int ret, i;
969
970 if (!IS_GEN7(dev) || ring != &dev_priv->ring[RCS])
971 return 0;
972
973 ret = intel_ring_begin(ring, 4 * 3);
974 if (ret)
975 return ret;
976
977 for (i = 0; i < 4; i++) {
978 intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
979 intel_ring_emit(ring, GEN7_SO_WRITE_OFFSET(i));
980 intel_ring_emit(ring, 0);
981 }
982
983 intel_ring_advance(ring);
984
985 return 0;
986 }
987
988 static int
989 i915_gem_do_execbuffer(struct drm_device *dev, void *data,
990 struct drm_file *file,
991 struct drm_i915_gem_execbuffer2 *args,
992 struct drm_i915_gem_exec_object2 *exec,
993 struct i915_address_space *vm)
994 {
995 drm_i915_private_t *dev_priv = dev->dev_private;
996 struct eb_vmas *eb;
997 struct drm_i915_gem_object *batch_obj;
998 struct drm_clip_rect *cliprects = NULL;
999 struct intel_ring_buffer *ring;
1000 const u32 ctx_id = i915_execbuffer2_get_context_id(*args);
1001 u32 exec_start, exec_len;
1002 u32 mask, flags;
1003 int ret, mode, i;
1004 bool need_relocs;
1005
1006 if (!i915_gem_check_execbuffer(args))
1007 return -EINVAL;
1008
1009 ret = validate_exec_list(exec, args->buffer_count);
1010 if (ret)
1011 return ret;
1012
1013 flags = 0;
1014 if (args->flags & I915_EXEC_SECURE) {
1015 if (!file->is_master || !capable(CAP_SYS_ADMIN))
1016 return -EPERM;
1017
1018 flags |= I915_DISPATCH_SECURE;
1019 }
1020 if (args->flags & I915_EXEC_IS_PINNED)
1021 flags |= I915_DISPATCH_PINNED;
1022
1023 switch (args->flags & I915_EXEC_RING_MASK) {
1024 case I915_EXEC_DEFAULT:
1025 case I915_EXEC_RENDER:
1026 ring = &dev_priv->ring[RCS];
1027 break;
1028 case I915_EXEC_BSD:
1029 ring = &dev_priv->ring[VCS];
1030 if (ctx_id != DEFAULT_CONTEXT_ID) {
1031 DRM_DEBUG("Ring %s doesn't support contexts\n",
1032 ring->name);
1033 return -EPERM;
1034 }
1035 break;
1036 case I915_EXEC_BLT:
1037 ring = &dev_priv->ring[BCS];
1038 if (ctx_id != DEFAULT_CONTEXT_ID) {
1039 DRM_DEBUG("Ring %s doesn't support contexts\n",
1040 ring->name);
1041 return -EPERM;
1042 }
1043 break;
1044 case I915_EXEC_VEBOX:
1045 ring = &dev_priv->ring[VECS];
1046 if (ctx_id != DEFAULT_CONTEXT_ID) {
1047 DRM_DEBUG("Ring %s doesn't support contexts\n",
1048 ring->name);
1049 return -EPERM;
1050 }
1051 break;
1052
1053 default:
1054 DRM_DEBUG("execbuf with unknown ring: %d\n",
1055 (int)(args->flags & I915_EXEC_RING_MASK));
1056 return -EINVAL;
1057 }
1058 if (!intel_ring_initialized(ring)) {
1059 DRM_DEBUG("execbuf with invalid ring: %d\n",
1060 (int)(args->flags & I915_EXEC_RING_MASK));
1061 return -EINVAL;
1062 }
1063
1064 mode = args->flags & I915_EXEC_CONSTANTS_MASK;
1065 mask = I915_EXEC_CONSTANTS_MASK;
1066 switch (mode) {
1067 case I915_EXEC_CONSTANTS_REL_GENERAL:
1068 case I915_EXEC_CONSTANTS_ABSOLUTE:
1069 case I915_EXEC_CONSTANTS_REL_SURFACE:
1070 if (ring == &dev_priv->ring[RCS] &&
1071 mode != dev_priv->relative_constants_mode) {
1072 if (INTEL_INFO(dev)->gen < 4)
1073 return -EINVAL;
1074
1075 if (INTEL_INFO(dev)->gen > 5 &&
1076 mode == I915_EXEC_CONSTANTS_REL_SURFACE)
1077 return -EINVAL;
1078
1079 /* The HW changed the meaning on this bit on gen6 */
1080 if (INTEL_INFO(dev)->gen >= 6)
1081 mask &= ~I915_EXEC_CONSTANTS_REL_SURFACE;
1082 }
1083 break;
1084 default:
1085 DRM_DEBUG("execbuf with unknown constants: %d\n", mode);
1086 return -EINVAL;
1087 }
1088
1089 if (args->buffer_count < 1) {
1090 DRM_DEBUG("execbuf with %d buffers\n", args->buffer_count);
1091 return -EINVAL;
1092 }
1093
1094 if (args->num_cliprects != 0) {
1095 if (ring != &dev_priv->ring[RCS]) {
1096 DRM_DEBUG("clip rectangles are only valid with the render ring\n");
1097 return -EINVAL;
1098 }
1099
1100 if (INTEL_INFO(dev)->gen >= 5) {
1101 DRM_DEBUG("clip rectangles are only valid on pre-gen5\n");
1102 return -EINVAL;
1103 }
1104
1105 if (args->num_cliprects > UINT_MAX / sizeof(*cliprects)) {
1106 DRM_DEBUG("execbuf with %u cliprects\n",
1107 args->num_cliprects);
1108 return -EINVAL;
1109 }
1110
1111 cliprects = kcalloc(args->num_cliprects,
1112 sizeof(*cliprects),
1113 GFP_KERNEL);
1114 if (cliprects == NULL) {
1115 ret = -ENOMEM;
1116 goto pre_mutex_err;
1117 }
1118
1119 if (copy_from_user(cliprects,
1120 to_user_ptr(args->cliprects_ptr),
1121 sizeof(*cliprects)*args->num_cliprects)) {
1122 ret = -EFAULT;
1123 goto pre_mutex_err;
1124 }
1125 }
1126
1127 intel_runtime_pm_get(dev_priv);
1128
1129 ret = i915_mutex_lock_interruptible(dev);
1130 if (ret)
1131 goto pre_mutex_err;
1132
1133 if (dev_priv->ums.mm_suspended) {
1134 mutex_unlock(&dev->struct_mutex);
1135 ret = -EBUSY;
1136 goto pre_mutex_err;
1137 }
1138
1139 ret = i915_gem_validate_context(dev, file, ctx_id);
1140 if (ret) {
1141 mutex_unlock(&dev->struct_mutex);
1142 goto pre_mutex_err;
1143 }
1144
1145 eb = eb_create(args);
1146 if (eb == NULL) {
1147 mutex_unlock(&dev->struct_mutex);
1148 ret = -ENOMEM;
1149 goto pre_mutex_err;
1150 }
1151
1152 /* Look up object handles */
1153 ret = eb_lookup_vmas(eb, exec, args, vm, file);
1154 if (ret)
1155 goto err;
1156
1157 /* take note of the batch buffer before we might reorder the lists */
1158 batch_obj = list_entry(eb->vmas.prev, struct i915_vma, exec_list)->obj;
1159
1160 /* Move the objects en-masse into the GTT, evicting if necessary. */
1161 need_relocs = (args->flags & I915_EXEC_NO_RELOC) == 0;
1162 ret = i915_gem_execbuffer_reserve(ring, &eb->vmas, &need_relocs);
1163 if (ret)
1164 goto err;
1165
1166 /* The objects are in their final locations, apply the relocations. */
1167 if (need_relocs)
1168 ret = i915_gem_execbuffer_relocate(eb);
1169 if (ret) {
1170 if (ret == -EFAULT) {
1171 ret = i915_gem_execbuffer_relocate_slow(dev, args, file, ring,
1172 eb, exec);
1173 BUG_ON(!mutex_is_locked(&dev->struct_mutex));
1174 }
1175 if (ret)
1176 goto err;
1177 }
1178
1179 /* Set the pending read domains for the batch buffer to COMMAND */
1180 if (batch_obj->base.pending_write_domain) {
1181 DRM_DEBUG("Attempting to use self-modifying batch buffer\n");
1182 ret = -EINVAL;
1183 goto err;
1184 }
1185 batch_obj->base.pending_read_domains |= I915_GEM_DOMAIN_COMMAND;
1186
1187 /* snb/ivb/vlv conflate the "batch in ppgtt" bit with the "non-secure
1188 * batch" bit. Hence we need to pin secure batches into the global gtt.
1189 * hsw should have this fixed, but bdw mucks it up again. */
1190 if (flags & I915_DISPATCH_SECURE && !batch_obj->has_global_gtt_mapping)
1191 i915_gem_gtt_bind_object(batch_obj, batch_obj->cache_level);
1192
1193 ret = i915_gem_execbuffer_move_to_gpu(ring, &eb->vmas);
1194 if (ret)
1195 goto err;
1196
1197 ret = i915_switch_context(ring, file, ctx_id);
1198 if (ret)
1199 goto err;
1200
1201 if (ring == &dev_priv->ring[RCS] &&
1202 mode != dev_priv->relative_constants_mode) {
1203 ret = intel_ring_begin(ring, 4);
1204 if (ret)
1205 goto err;
1206
1207 intel_ring_emit(ring, MI_NOOP);
1208 intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
1209 intel_ring_emit(ring, INSTPM);
1210 intel_ring_emit(ring, mask << 16 | mode);
1211 intel_ring_advance(ring);
1212
1213 dev_priv->relative_constants_mode = mode;
1214 }
1215
1216 if (args->flags & I915_EXEC_GEN7_SOL_RESET) {
1217 ret = i915_reset_gen7_sol_offsets(dev, ring);
1218 if (ret)
1219 goto err;
1220 }
1221
1222 exec_start = i915_gem_obj_offset(batch_obj, vm) +
1223 args->batch_start_offset;
1224 exec_len = args->batch_len;
1225 if (cliprects) {
1226 for (i = 0; i < args->num_cliprects; i++) {
1227 ret = i915_emit_box(dev, &cliprects[i],
1228 args->DR1, args->DR4);
1229 if (ret)
1230 goto err;
1231
1232 ret = ring->dispatch_execbuffer(ring,
1233 exec_start, exec_len,
1234 flags);
1235 if (ret)
1236 goto err;
1237 }
1238 } else {
1239 ret = ring->dispatch_execbuffer(ring,
1240 exec_start, exec_len,
1241 flags);
1242 if (ret)
1243 goto err;
1244 }
1245
1246 trace_i915_gem_ring_dispatch(ring, intel_ring_get_seqno(ring), flags);
1247
1248 i915_gem_execbuffer_move_to_active(&eb->vmas, ring);
1249 i915_gem_execbuffer_retire_commands(dev, file, ring, batch_obj);
1250
1251 err:
1252 eb_destroy(eb);
1253
1254 mutex_unlock(&dev->struct_mutex);
1255
1256 pre_mutex_err:
1257 kfree(cliprects);
1258
1259 /* intel_gpu_busy should also get a ref, so it will free when the device
1260 * is really idle. */
1261 intel_runtime_pm_put(dev_priv);
1262 return ret;
1263 }
1264
1265 /*
1266 * Legacy execbuffer just creates an exec2 list from the original exec object
1267 * list array and passes it to the real function.
1268 */
1269 int
1270 i915_gem_execbuffer(struct drm_device *dev, void *data,
1271 struct drm_file *file)
1272 {
1273 struct drm_i915_private *dev_priv = dev->dev_private;
1274 struct drm_i915_gem_execbuffer *args = data;
1275 struct drm_i915_gem_execbuffer2 exec2;
1276 struct drm_i915_gem_exec_object *exec_list = NULL;
1277 struct drm_i915_gem_exec_object2 *exec2_list = NULL;
1278 int ret, i;
1279
1280 if (args->buffer_count < 1) {
1281 DRM_DEBUG("execbuf with %d buffers\n", args->buffer_count);
1282 return -EINVAL;
1283 }
1284
1285 /* Copy in the exec list from userland */
1286 exec_list = drm_malloc_ab(sizeof(*exec_list), args->buffer_count);
1287 exec2_list = drm_malloc_ab(sizeof(*exec2_list), args->buffer_count);
1288 if (exec_list == NULL || exec2_list == NULL) {
1289 DRM_DEBUG("Failed to allocate exec list for %d buffers\n",
1290 args->buffer_count);
1291 drm_free_large(exec_list);
1292 drm_free_large(exec2_list);
1293 return -ENOMEM;
1294 }
1295 ret = copy_from_user(exec_list,
1296 to_user_ptr(args->buffers_ptr),
1297 sizeof(*exec_list) * args->buffer_count);
1298 if (ret != 0) {
1299 DRM_DEBUG("copy %d exec entries failed %d\n",
1300 args->buffer_count, ret);
1301 drm_free_large(exec_list);
1302 drm_free_large(exec2_list);
1303 return -EFAULT;
1304 }
1305
1306 for (i = 0; i < args->buffer_count; i++) {
1307 exec2_list[i].handle = exec_list[i].handle;
1308 exec2_list[i].relocation_count = exec_list[i].relocation_count;
1309 exec2_list[i].relocs_ptr = exec_list[i].relocs_ptr;
1310 exec2_list[i].alignment = exec_list[i].alignment;
1311 exec2_list[i].offset = exec_list[i].offset;
1312 if (INTEL_INFO(dev)->gen < 4)
1313 exec2_list[i].flags = EXEC_OBJECT_NEEDS_FENCE;
1314 else
1315 exec2_list[i].flags = 0;
1316 }
1317
1318 exec2.buffers_ptr = args->buffers_ptr;
1319 exec2.buffer_count = args->buffer_count;
1320 exec2.batch_start_offset = args->batch_start_offset;
1321 exec2.batch_len = args->batch_len;
1322 exec2.DR1 = args->DR1;
1323 exec2.DR4 = args->DR4;
1324 exec2.num_cliprects = args->num_cliprects;
1325 exec2.cliprects_ptr = args->cliprects_ptr;
1326 exec2.flags = I915_EXEC_RENDER;
1327 i915_execbuffer2_set_context_id(exec2, 0);
1328
1329 ret = i915_gem_do_execbuffer(dev, data, file, &exec2, exec2_list,
1330 &dev_priv->gtt.base);
1331 if (!ret) {
1332 /* Copy the new buffer offsets back to the user's exec list. */
1333 for (i = 0; i < args->buffer_count; i++)
1334 exec_list[i].offset = exec2_list[i].offset;
1335 /* ... and back out to userspace */
1336 ret = copy_to_user(to_user_ptr(args->buffers_ptr),
1337 exec_list,
1338 sizeof(*exec_list) * args->buffer_count);
1339 if (ret) {
1340 ret = -EFAULT;
1341 DRM_DEBUG("failed to copy %d exec entries "
1342 "back to user (%d)\n",
1343 args->buffer_count, ret);
1344 }
1345 }
1346
1347 drm_free_large(exec_list);
1348 drm_free_large(exec2_list);
1349 return ret;
1350 }
1351
1352 int
1353 i915_gem_execbuffer2(struct drm_device *dev, void *data,
1354 struct drm_file *file)
1355 {
1356 struct drm_i915_private *dev_priv = dev->dev_private;
1357 struct drm_i915_gem_execbuffer2 *args = data;
1358 struct drm_i915_gem_exec_object2 *exec2_list = NULL;
1359 int ret;
1360
1361 if (args->buffer_count < 1 ||
1362 args->buffer_count > UINT_MAX / sizeof(*exec2_list)) {
1363 DRM_DEBUG("execbuf2 with %d buffers\n", args->buffer_count);
1364 return -EINVAL;
1365 }
1366
1367 exec2_list = kmalloc(sizeof(*exec2_list)*args->buffer_count,
1368 GFP_TEMPORARY | __GFP_NOWARN | __GFP_NORETRY);
1369 if (exec2_list == NULL)
1370 exec2_list = drm_malloc_ab(sizeof(*exec2_list),
1371 args->buffer_count);
1372 if (exec2_list == NULL) {
1373 DRM_DEBUG("Failed to allocate exec list for %d buffers\n",
1374 args->buffer_count);
1375 return -ENOMEM;
1376 }
1377 ret = copy_from_user(exec2_list,
1378 to_user_ptr(args->buffers_ptr),
1379 sizeof(*exec2_list) * args->buffer_count);
1380 if (ret != 0) {
1381 DRM_DEBUG("copy %d exec entries failed %d\n",
1382 args->buffer_count, ret);
1383 drm_free_large(exec2_list);
1384 return -EFAULT;
1385 }
1386
1387 ret = i915_gem_do_execbuffer(dev, data, file, args, exec2_list,
1388 &dev_priv->gtt.base);
1389 if (!ret) {
1390 /* Copy the new buffer offsets back to the user's exec list. */
1391 ret = copy_to_user(to_user_ptr(args->buffers_ptr),
1392 exec2_list,
1393 sizeof(*exec2_list) * args->buffer_count);
1394 if (ret) {
1395 ret = -EFAULT;
1396 DRM_DEBUG("failed to copy %d exec entries "
1397 "back to user (%d)\n",
1398 args->buffer_count, ret);
1399 }
1400 }
1401
1402 drm_free_large(exec2_list);
1403 return ret;
1404 }
Linux with added FPC-III support