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Merge branch 'for-4.1' of git://linux-nfs.org/~bfields/linux
[deliverable/linux.git] / drivers / gpu / drm / i915 / i915_gem_execbuffer.c
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 #define __EXEC_OBJECT_NEEDS_MAP (1<<29)
39 #define __EXEC_OBJECT_NEEDS_BIAS (1<<28)
40 #define __EXEC_OBJECT_PURGEABLE (1<<27)
41
42 #define BATCH_OFFSET_BIAS (256*1024)
43
44 struct eb_vmas {
45 struct list_head vmas;
46 int and;
47 union {
48 struct i915_vma *lut[0];
49 struct hlist_head buckets[0];
50 };
51 };
52
53 static struct eb_vmas *
54 eb_create(struct drm_i915_gem_execbuffer2 *args)
55 {
56 struct eb_vmas *eb = NULL;
57
58 if (args->flags & I915_EXEC_HANDLE_LUT) {
59 unsigned size = args->buffer_count;
60 size *= sizeof(struct i915_vma *);
61 size += sizeof(struct eb_vmas);
62 eb = kmalloc(size, GFP_TEMPORARY | __GFP_NOWARN | __GFP_NORETRY);
63 }
64
65 if (eb == NULL) {
66 unsigned size = args->buffer_count;
67 unsigned count = PAGE_SIZE / sizeof(struct hlist_head) / 2;
68 BUILD_BUG_ON_NOT_POWER_OF_2(PAGE_SIZE / sizeof(struct hlist_head));
69 while (count > 2*size)
70 count >>= 1;
71 eb = kzalloc(count*sizeof(struct hlist_head) +
72 sizeof(struct eb_vmas),
73 GFP_TEMPORARY);
74 if (eb == NULL)
75 return eb;
76
77 eb->and = count - 1;
78 } else
79 eb->and = -args->buffer_count;
80
81 INIT_LIST_HEAD(&eb->vmas);
82 return eb;
83 }
84
85 static void
86 eb_reset(struct eb_vmas *eb)
87 {
88 if (eb->and >= 0)
89 memset(eb->buckets, 0, (eb->and+1)*sizeof(struct hlist_head));
90 }
91
92 static int
93 eb_lookup_vmas(struct eb_vmas *eb,
94 struct drm_i915_gem_exec_object2 *exec,
95 const struct drm_i915_gem_execbuffer2 *args,
96 struct i915_address_space *vm,
97 struct drm_file *file)
98 {
99 struct drm_i915_gem_object *obj;
100 struct list_head objects;
101 int i, ret;
102
103 INIT_LIST_HEAD(&objects);
104 spin_lock(&file->table_lock);
105 /* Grab a reference to the object and release the lock so we can lookup
106 * or create the VMA without using GFP_ATOMIC */
107 for (i = 0; i < args->buffer_count; i++) {
108 obj = to_intel_bo(idr_find(&file->object_idr, exec[i].handle));
109 if (obj == NULL) {
110 spin_unlock(&file->table_lock);
111 DRM_DEBUG("Invalid object handle %d at index %d\n",
112 exec[i].handle, i);
113 ret = -ENOENT;
114 goto err;
115 }
116
117 if (!list_empty(&obj->obj_exec_link)) {
118 spin_unlock(&file->table_lock);
119 DRM_DEBUG("Object %p [handle %d, index %d] appears more than once in object list\n",
120 obj, exec[i].handle, i);
121 ret = -EINVAL;
122 goto err;
123 }
124
125 drm_gem_object_reference(&obj->base);
126 list_add_tail(&obj->obj_exec_link, &objects);
127 }
128 spin_unlock(&file->table_lock);
129
130 i = 0;
131 while (!list_empty(&objects)) {
132 struct i915_vma *vma;
133
134 obj = list_first_entry(&objects,
135 struct drm_i915_gem_object,
136 obj_exec_link);
137
138 /*
139 * NOTE: We can leak any vmas created here when something fails
140 * later on. But that's no issue since vma_unbind can deal with
141 * vmas which are not actually bound. And since only
142 * lookup_or_create exists as an interface to get at the vma
143 * from the (obj, vm) we don't run the risk of creating
144 * duplicated vmas for the same vm.
145 */
146 vma = i915_gem_obj_lookup_or_create_vma(obj, vm);
147 if (IS_ERR(vma)) {
148 DRM_DEBUG("Failed to lookup VMA\n");
149 ret = PTR_ERR(vma);
150 goto err;
151 }
152
153 /* Transfer ownership from the objects list to the vmas list. */
154 list_add_tail(&vma->exec_list, &eb->vmas);
155 list_del_init(&obj->obj_exec_link);
156
157 vma->exec_entry = &exec[i];
158 if (eb->and < 0) {
159 eb->lut[i] = vma;
160 } else {
161 uint32_t handle = args->flags & I915_EXEC_HANDLE_LUT ? i : exec[i].handle;
162 vma->exec_handle = handle;
163 hlist_add_head(&vma->exec_node,
164 &eb->buckets[handle & eb->and]);
165 }
166 ++i;
167 }
168
169 return 0;
170
171
172 err:
173 while (!list_empty(&objects)) {
174 obj = list_first_entry(&objects,
175 struct drm_i915_gem_object,
176 obj_exec_link);
177 list_del_init(&obj->obj_exec_link);
178 drm_gem_object_unreference(&obj->base);
179 }
180 /*
181 * Objects already transfered to the vmas list will be unreferenced by
182 * eb_destroy.
183 */
184
185 return ret;
186 }
187
188 static struct i915_vma *eb_get_vma(struct eb_vmas *eb, unsigned long handle)
189 {
190 if (eb->and < 0) {
191 if (handle >= -eb->and)
192 return NULL;
193 return eb->lut[handle];
194 } else {
195 struct hlist_head *head;
196 struct hlist_node *node;
197
198 head = &eb->buckets[handle & eb->and];
199 hlist_for_each(node, head) {
200 struct i915_vma *vma;
201
202 vma = hlist_entry(node, struct i915_vma, exec_node);
203 if (vma->exec_handle == handle)
204 return vma;
205 }
206 return NULL;
207 }
208 }
209
210 static void
211 i915_gem_execbuffer_unreserve_vma(struct i915_vma *vma)
212 {
213 struct drm_i915_gem_exec_object2 *entry;
214 struct drm_i915_gem_object *obj = vma->obj;
215
216 if (!drm_mm_node_allocated(&vma->node))
217 return;
218
219 entry = vma->exec_entry;
220
221 if (entry->flags & __EXEC_OBJECT_HAS_FENCE)
222 i915_gem_object_unpin_fence(obj);
223
224 if (entry->flags & __EXEC_OBJECT_HAS_PIN)
225 vma->pin_count--;
226
227 if (entry->flags & __EXEC_OBJECT_PURGEABLE)
228 obj->madv = I915_MADV_DONTNEED;
229
230 entry->flags &= ~(__EXEC_OBJECT_HAS_FENCE |
231 __EXEC_OBJECT_HAS_PIN |
232 __EXEC_OBJECT_PURGEABLE);
233 }
234
235 static void eb_destroy(struct eb_vmas *eb)
236 {
237 while (!list_empty(&eb->vmas)) {
238 struct i915_vma *vma;
239
240 vma = list_first_entry(&eb->vmas,
241 struct i915_vma,
242 exec_list);
243 list_del_init(&vma->exec_list);
244 i915_gem_execbuffer_unreserve_vma(vma);
245 drm_gem_object_unreference(&vma->obj->base);
246 }
247 kfree(eb);
248 }
249
250 static inline int use_cpu_reloc(struct drm_i915_gem_object *obj)
251 {
252 return (HAS_LLC(obj->base.dev) ||
253 obj->base.write_domain == I915_GEM_DOMAIN_CPU ||
254 obj->cache_level != I915_CACHE_NONE);
255 }
256
257 static int
258 relocate_entry_cpu(struct drm_i915_gem_object *obj,
259 struct drm_i915_gem_relocation_entry *reloc,
260 uint64_t target_offset)
261 {
262 struct drm_device *dev = obj->base.dev;
263 uint32_t page_offset = offset_in_page(reloc->offset);
264 uint64_t delta = reloc->delta + target_offset;
265 char *vaddr;
266 int ret;
267
268 ret = i915_gem_object_set_to_cpu_domain(obj, true);
269 if (ret)
270 return ret;
271
272 vaddr = kmap_atomic(i915_gem_object_get_page(obj,
273 reloc->offset >> PAGE_SHIFT));
274 *(uint32_t *)(vaddr + page_offset) = lower_32_bits(delta);
275
276 if (INTEL_INFO(dev)->gen >= 8) {
277 page_offset = offset_in_page(page_offset + sizeof(uint32_t));
278
279 if (page_offset == 0) {
280 kunmap_atomic(vaddr);
281 vaddr = kmap_atomic(i915_gem_object_get_page(obj,
282 (reloc->offset + sizeof(uint32_t)) >> PAGE_SHIFT));
283 }
284
285 *(uint32_t *)(vaddr + page_offset) = upper_32_bits(delta);
286 }
287
288 kunmap_atomic(vaddr);
289
290 return 0;
291 }
292
293 static int
294 relocate_entry_gtt(struct drm_i915_gem_object *obj,
295 struct drm_i915_gem_relocation_entry *reloc,
296 uint64_t target_offset)
297 {
298 struct drm_device *dev = obj->base.dev;
299 struct drm_i915_private *dev_priv = dev->dev_private;
300 uint64_t delta = reloc->delta + target_offset;
301 uint64_t offset;
302 void __iomem *reloc_page;
303 int ret;
304
305 ret = i915_gem_object_set_to_gtt_domain(obj, true);
306 if (ret)
307 return ret;
308
309 ret = i915_gem_object_put_fence(obj);
310 if (ret)
311 return ret;
312
313 /* Map the page containing the relocation we're going to perform. */
314 offset = i915_gem_obj_ggtt_offset(obj);
315 offset += reloc->offset;
316 reloc_page = io_mapping_map_atomic_wc(dev_priv->gtt.mappable,
317 offset & PAGE_MASK);
318 iowrite32(lower_32_bits(delta), reloc_page + offset_in_page(offset));
319
320 if (INTEL_INFO(dev)->gen >= 8) {
321 offset += sizeof(uint32_t);
322
323 if (offset_in_page(offset) == 0) {
324 io_mapping_unmap_atomic(reloc_page);
325 reloc_page =
326 io_mapping_map_atomic_wc(dev_priv->gtt.mappable,
327 offset);
328 }
329
330 iowrite32(upper_32_bits(delta),
331 reloc_page + offset_in_page(offset));
332 }
333
334 io_mapping_unmap_atomic(reloc_page);
335
336 return 0;
337 }
338
339 static void
340 clflush_write32(void *addr, uint32_t value)
341 {
342 /* This is not a fast path, so KISS. */
343 drm_clflush_virt_range(addr, sizeof(uint32_t));
344 *(uint32_t *)addr = value;
345 drm_clflush_virt_range(addr, sizeof(uint32_t));
346 }
347
348 static int
349 relocate_entry_clflush(struct drm_i915_gem_object *obj,
350 struct drm_i915_gem_relocation_entry *reloc,
351 uint64_t target_offset)
352 {
353 struct drm_device *dev = obj->base.dev;
354 uint32_t page_offset = offset_in_page(reloc->offset);
355 uint64_t delta = (int)reloc->delta + target_offset;
356 char *vaddr;
357 int ret;
358
359 ret = i915_gem_object_set_to_gtt_domain(obj, true);
360 if (ret)
361 return ret;
362
363 vaddr = kmap_atomic(i915_gem_object_get_page(obj,
364 reloc->offset >> PAGE_SHIFT));
365 clflush_write32(vaddr + page_offset, lower_32_bits(delta));
366
367 if (INTEL_INFO(dev)->gen >= 8) {
368 page_offset = offset_in_page(page_offset + sizeof(uint32_t));
369
370 if (page_offset == 0) {
371 kunmap_atomic(vaddr);
372 vaddr = kmap_atomic(i915_gem_object_get_page(obj,
373 (reloc->offset + sizeof(uint32_t)) >> PAGE_SHIFT));
374 }
375
376 clflush_write32(vaddr + page_offset, upper_32_bits(delta));
377 }
378
379 kunmap_atomic(vaddr);
380
381 return 0;
382 }
383
384 static int
385 i915_gem_execbuffer_relocate_entry(struct drm_i915_gem_object *obj,
386 struct eb_vmas *eb,
387 struct drm_i915_gem_relocation_entry *reloc)
388 {
389 struct drm_device *dev = obj->base.dev;
390 struct drm_gem_object *target_obj;
391 struct drm_i915_gem_object *target_i915_obj;
392 struct i915_vma *target_vma;
393 uint64_t target_offset;
394 int ret;
395
396 /* we've already hold a reference to all valid objects */
397 target_vma = eb_get_vma(eb, reloc->target_handle);
398 if (unlikely(target_vma == NULL))
399 return -ENOENT;
400 target_i915_obj = target_vma->obj;
401 target_obj = &target_vma->obj->base;
402
403 target_offset = target_vma->node.start;
404
405 /* Sandybridge PPGTT errata: We need a global gtt mapping for MI and
406 * pipe_control writes because the gpu doesn't properly redirect them
407 * through the ppgtt for non_secure batchbuffers. */
408 if (unlikely(IS_GEN6(dev) &&
409 reloc->write_domain == I915_GEM_DOMAIN_INSTRUCTION &&
410 !(target_vma->bound & GLOBAL_BIND))) {
411 ret = i915_vma_bind(target_vma, target_i915_obj->cache_level,
412 GLOBAL_BIND);
413 if (WARN_ONCE(ret, "Unexpected failure to bind target VMA!"))
414 return ret;
415 }
416
417 /* Validate that the target is in a valid r/w GPU domain */
418 if (unlikely(reloc->write_domain & (reloc->write_domain - 1))) {
419 DRM_DEBUG("reloc with multiple write domains: "
420 "obj %p target %d offset %d "
421 "read %08x write %08x",
422 obj, reloc->target_handle,
423 (int) reloc->offset,
424 reloc->read_domains,
425 reloc->write_domain);
426 return -EINVAL;
427 }
428 if (unlikely((reloc->write_domain | reloc->read_domains)
429 & ~I915_GEM_GPU_DOMAINS)) {
430 DRM_DEBUG("reloc with read/write non-GPU domains: "
431 "obj %p target %d offset %d "
432 "read %08x write %08x",
433 obj, reloc->target_handle,
434 (int) reloc->offset,
435 reloc->read_domains,
436 reloc->write_domain);
437 return -EINVAL;
438 }
439
440 target_obj->pending_read_domains |= reloc->read_domains;
441 target_obj->pending_write_domain |= reloc->write_domain;
442
443 /* If the relocation already has the right value in it, no
444 * more work needs to be done.
445 */
446 if (target_offset == reloc->presumed_offset)
447 return 0;
448
449 /* Check that the relocation address is valid... */
450 if (unlikely(reloc->offset >
451 obj->base.size - (INTEL_INFO(dev)->gen >= 8 ? 8 : 4))) {
452 DRM_DEBUG("Relocation beyond object bounds: "
453 "obj %p target %d offset %d size %d.\n",
454 obj, reloc->target_handle,
455 (int) reloc->offset,
456 (int) obj->base.size);
457 return -EINVAL;
458 }
459 if (unlikely(reloc->offset & 3)) {
460 DRM_DEBUG("Relocation not 4-byte aligned: "
461 "obj %p target %d offset %d.\n",
462 obj, reloc->target_handle,
463 (int) reloc->offset);
464 return -EINVAL;
465 }
466
467 /* We can't wait for rendering with pagefaults disabled */
468 if (obj->active && in_atomic())
469 return -EFAULT;
470
471 if (use_cpu_reloc(obj))
472 ret = relocate_entry_cpu(obj, reloc, target_offset);
473 else if (obj->map_and_fenceable)
474 ret = relocate_entry_gtt(obj, reloc, target_offset);
475 else if (cpu_has_clflush)
476 ret = relocate_entry_clflush(obj, reloc, target_offset);
477 else {
478 WARN_ONCE(1, "Impossible case in relocation handling\n");
479 ret = -ENODEV;
480 }
481
482 if (ret)
483 return ret;
484
485 /* and update the user's relocation entry */
486 reloc->presumed_offset = target_offset;
487
488 return 0;
489 }
490
491 static int
492 i915_gem_execbuffer_relocate_vma(struct i915_vma *vma,
493 struct eb_vmas *eb)
494 {
495 #define N_RELOC(x) ((x) / sizeof(struct drm_i915_gem_relocation_entry))
496 struct drm_i915_gem_relocation_entry stack_reloc[N_RELOC(512)];
497 struct drm_i915_gem_relocation_entry __user *user_relocs;
498 struct drm_i915_gem_exec_object2 *entry = vma->exec_entry;
499 int remain, ret;
500
501 user_relocs = to_user_ptr(entry->relocs_ptr);
502
503 remain = entry->relocation_count;
504 while (remain) {
505 struct drm_i915_gem_relocation_entry *r = stack_reloc;
506 int count = remain;
507 if (count > ARRAY_SIZE(stack_reloc))
508 count = ARRAY_SIZE(stack_reloc);
509 remain -= count;
510
511 if (__copy_from_user_inatomic(r, user_relocs, count*sizeof(r[0])))
512 return -EFAULT;
513
514 do {
515 u64 offset = r->presumed_offset;
516
517 ret = i915_gem_execbuffer_relocate_entry(vma->obj, eb, r);
518 if (ret)
519 return ret;
520
521 if (r->presumed_offset != offset &&
522 __copy_to_user_inatomic(&user_relocs->presumed_offset,
523 &r->presumed_offset,
524 sizeof(r->presumed_offset))) {
525 return -EFAULT;
526 }
527
528 user_relocs++;
529 r++;
530 } while (--count);
531 }
532
533 return 0;
534 #undef N_RELOC
535 }
536
537 static int
538 i915_gem_execbuffer_relocate_vma_slow(struct i915_vma *vma,
539 struct eb_vmas *eb,
540 struct drm_i915_gem_relocation_entry *relocs)
541 {
542 const struct drm_i915_gem_exec_object2 *entry = vma->exec_entry;
543 int i, ret;
544
545 for (i = 0; i < entry->relocation_count; i++) {
546 ret = i915_gem_execbuffer_relocate_entry(vma->obj, eb, &relocs[i]);
547 if (ret)
548 return ret;
549 }
550
551 return 0;
552 }
553
554 static int
555 i915_gem_execbuffer_relocate(struct eb_vmas *eb)
556 {
557 struct i915_vma *vma;
558 int ret = 0;
559
560 /* This is the fast path and we cannot handle a pagefault whilst
561 * holding the struct mutex lest the user pass in the relocations
562 * contained within a mmaped bo. For in such a case we, the page
563 * fault handler would call i915_gem_fault() and we would try to
564 * acquire the struct mutex again. Obviously this is bad and so
565 * lockdep complains vehemently.
566 */
567 pagefault_disable();
568 list_for_each_entry(vma, &eb->vmas, exec_list) {
569 ret = i915_gem_execbuffer_relocate_vma(vma, eb);
570 if (ret)
571 break;
572 }
573 pagefault_enable();
574
575 return ret;
576 }
577
578 static bool only_mappable_for_reloc(unsigned int flags)
579 {
580 return (flags & (EXEC_OBJECT_NEEDS_FENCE | __EXEC_OBJECT_NEEDS_MAP)) ==
581 __EXEC_OBJECT_NEEDS_MAP;
582 }
583
584 static int
585 i915_gem_execbuffer_reserve_vma(struct i915_vma *vma,
586 struct intel_engine_cs *ring,
587 bool *need_reloc)
588 {
589 struct drm_i915_gem_object *obj = vma->obj;
590 struct drm_i915_gem_exec_object2 *entry = vma->exec_entry;
591 uint64_t flags;
592 int ret;
593
594 flags = 0;
595 if (!drm_mm_node_allocated(&vma->node)) {
596 if (entry->flags & __EXEC_OBJECT_NEEDS_MAP)
597 flags |= PIN_GLOBAL | PIN_MAPPABLE;
598 if (entry->flags & EXEC_OBJECT_NEEDS_GTT)
599 flags |= PIN_GLOBAL;
600 if (entry->flags & __EXEC_OBJECT_NEEDS_BIAS)
601 flags |= BATCH_OFFSET_BIAS | PIN_OFFSET_BIAS;
602 }
603
604 ret = i915_gem_object_pin(obj, vma->vm, entry->alignment, flags);
605 if ((ret == -ENOSPC || ret == -E2BIG) &&
606 only_mappable_for_reloc(entry->flags))
607 ret = i915_gem_object_pin(obj, vma->vm,
608 entry->alignment,
609 flags & ~(PIN_GLOBAL | PIN_MAPPABLE));
610 if (ret)
611 return ret;
612
613 entry->flags |= __EXEC_OBJECT_HAS_PIN;
614
615 if (entry->flags & EXEC_OBJECT_NEEDS_FENCE) {
616 ret = i915_gem_object_get_fence(obj);
617 if (ret)
618 return ret;
619
620 if (i915_gem_object_pin_fence(obj))
621 entry->flags |= __EXEC_OBJECT_HAS_FENCE;
622 }
623
624 if (entry->offset != vma->node.start) {
625 entry->offset = vma->node.start;
626 *need_reloc = true;
627 }
628
629 if (entry->flags & EXEC_OBJECT_WRITE) {
630 obj->base.pending_read_domains = I915_GEM_DOMAIN_RENDER;
631 obj->base.pending_write_domain = I915_GEM_DOMAIN_RENDER;
632 }
633
634 return 0;
635 }
636
637 static bool
638 need_reloc_mappable(struct i915_vma *vma)
639 {
640 struct drm_i915_gem_exec_object2 *entry = vma->exec_entry;
641
642 if (entry->relocation_count == 0)
643 return false;
644
645 if (!i915_is_ggtt(vma->vm))
646 return false;
647
648 /* See also use_cpu_reloc() */
649 if (HAS_LLC(vma->obj->base.dev))
650 return false;
651
652 if (vma->obj->base.write_domain == I915_GEM_DOMAIN_CPU)
653 return false;
654
655 return true;
656 }
657
658 static bool
659 eb_vma_misplaced(struct i915_vma *vma)
660 {
661 struct drm_i915_gem_exec_object2 *entry = vma->exec_entry;
662 struct drm_i915_gem_object *obj = vma->obj;
663
664 WARN_ON(entry->flags & __EXEC_OBJECT_NEEDS_MAP &&
665 !i915_is_ggtt(vma->vm));
666
667 if (entry->alignment &&
668 vma->node.start & (entry->alignment - 1))
669 return true;
670
671 if (entry->flags & __EXEC_OBJECT_NEEDS_BIAS &&
672 vma->node.start < BATCH_OFFSET_BIAS)
673 return true;
674
675 /* avoid costly ping-pong once a batch bo ended up non-mappable */
676 if (entry->flags & __EXEC_OBJECT_NEEDS_MAP && !obj->map_and_fenceable)
677 return !only_mappable_for_reloc(entry->flags);
678
679 return false;
680 }
681
682 static int
683 i915_gem_execbuffer_reserve(struct intel_engine_cs *ring,
684 struct list_head *vmas,
685 bool *need_relocs)
686 {
687 struct drm_i915_gem_object *obj;
688 struct i915_vma *vma;
689 struct i915_address_space *vm;
690 struct list_head ordered_vmas;
691 bool has_fenced_gpu_access = INTEL_INFO(ring->dev)->gen < 4;
692 int retry;
693
694 i915_gem_retire_requests_ring(ring);
695
696 vm = list_first_entry(vmas, struct i915_vma, exec_list)->vm;
697
698 INIT_LIST_HEAD(&ordered_vmas);
699 while (!list_empty(vmas)) {
700 struct drm_i915_gem_exec_object2 *entry;
701 bool need_fence, need_mappable;
702
703 vma = list_first_entry(vmas, struct i915_vma, exec_list);
704 obj = vma->obj;
705 entry = vma->exec_entry;
706
707 if (!has_fenced_gpu_access)
708 entry->flags &= ~EXEC_OBJECT_NEEDS_FENCE;
709 need_fence =
710 entry->flags & EXEC_OBJECT_NEEDS_FENCE &&
711 obj->tiling_mode != I915_TILING_NONE;
712 need_mappable = need_fence || need_reloc_mappable(vma);
713
714 if (need_mappable) {
715 entry->flags |= __EXEC_OBJECT_NEEDS_MAP;
716 list_move(&vma->exec_list, &ordered_vmas);
717 } else
718 list_move_tail(&vma->exec_list, &ordered_vmas);
719
720 obj->base.pending_read_domains = I915_GEM_GPU_DOMAINS & ~I915_GEM_DOMAIN_COMMAND;
721 obj->base.pending_write_domain = 0;
722 }
723 list_splice(&ordered_vmas, vmas);
724
725 /* Attempt to pin all of the buffers into the GTT.
726 * This is done in 3 phases:
727 *
728 * 1a. Unbind all objects that do not match the GTT constraints for
729 * the execbuffer (fenceable, mappable, alignment etc).
730 * 1b. Increment pin count for already bound objects.
731 * 2. Bind new objects.
732 * 3. Decrement pin count.
733 *
734 * This avoid unnecessary unbinding of later objects in order to make
735 * room for the earlier objects *unless* we need to defragment.
736 */
737 retry = 0;
738 do {
739 int ret = 0;
740
741 /* Unbind any ill-fitting objects or pin. */
742 list_for_each_entry(vma, vmas, exec_list) {
743 if (!drm_mm_node_allocated(&vma->node))
744 continue;
745
746 if (eb_vma_misplaced(vma))
747 ret = i915_vma_unbind(vma);
748 else
749 ret = i915_gem_execbuffer_reserve_vma(vma, ring, need_relocs);
750 if (ret)
751 goto err;
752 }
753
754 /* Bind fresh objects */
755 list_for_each_entry(vma, vmas, exec_list) {
756 if (drm_mm_node_allocated(&vma->node))
757 continue;
758
759 ret = i915_gem_execbuffer_reserve_vma(vma, ring, need_relocs);
760 if (ret)
761 goto err;
762 }
763
764 err:
765 if (ret != -ENOSPC || retry++)
766 return ret;
767
768 /* Decrement pin count for bound objects */
769 list_for_each_entry(vma, vmas, exec_list)
770 i915_gem_execbuffer_unreserve_vma(vma);
771
772 ret = i915_gem_evict_vm(vm, true);
773 if (ret)
774 return ret;
775 } while (1);
776 }
777
778 static int
779 i915_gem_execbuffer_relocate_slow(struct drm_device *dev,
780 struct drm_i915_gem_execbuffer2 *args,
781 struct drm_file *file,
782 struct intel_engine_cs *ring,
783 struct eb_vmas *eb,
784 struct drm_i915_gem_exec_object2 *exec)
785 {
786 struct drm_i915_gem_relocation_entry *reloc;
787 struct i915_address_space *vm;
788 struct i915_vma *vma;
789 bool need_relocs;
790 int *reloc_offset;
791 int i, total, ret;
792 unsigned count = args->buffer_count;
793
794 vm = list_first_entry(&eb->vmas, struct i915_vma, exec_list)->vm;
795
796 /* We may process another execbuffer during the unlock... */
797 while (!list_empty(&eb->vmas)) {
798 vma = list_first_entry(&eb->vmas, struct i915_vma, exec_list);
799 list_del_init(&vma->exec_list);
800 i915_gem_execbuffer_unreserve_vma(vma);
801 drm_gem_object_unreference(&vma->obj->base);
802 }
803
804 mutex_unlock(&dev->struct_mutex);
805
806 total = 0;
807 for (i = 0; i < count; i++)
808 total += exec[i].relocation_count;
809
810 reloc_offset = drm_malloc_ab(count, sizeof(*reloc_offset));
811 reloc = drm_malloc_ab(total, sizeof(*reloc));
812 if (reloc == NULL || reloc_offset == NULL) {
813 drm_free_large(reloc);
814 drm_free_large(reloc_offset);
815 mutex_lock(&dev->struct_mutex);
816 return -ENOMEM;
817 }
818
819 total = 0;
820 for (i = 0; i < count; i++) {
821 struct drm_i915_gem_relocation_entry __user *user_relocs;
822 u64 invalid_offset = (u64)-1;
823 int j;
824
825 user_relocs = to_user_ptr(exec[i].relocs_ptr);
826
827 if (copy_from_user(reloc+total, user_relocs,
828 exec[i].relocation_count * sizeof(*reloc))) {
829 ret = -EFAULT;
830 mutex_lock(&dev->struct_mutex);
831 goto err;
832 }
833
834 /* As we do not update the known relocation offsets after
835 * relocating (due to the complexities in lock handling),
836 * we need to mark them as invalid now so that we force the
837 * relocation processing next time. Just in case the target
838 * object is evicted and then rebound into its old
839 * presumed_offset before the next execbuffer - if that
840 * happened we would make the mistake of assuming that the
841 * relocations were valid.
842 */
843 for (j = 0; j < exec[i].relocation_count; j++) {
844 if (__copy_to_user(&user_relocs[j].presumed_offset,
845 &invalid_offset,
846 sizeof(invalid_offset))) {
847 ret = -EFAULT;
848 mutex_lock(&dev->struct_mutex);
849 goto err;
850 }
851 }
852
853 reloc_offset[i] = total;
854 total += exec[i].relocation_count;
855 }
856
857 ret = i915_mutex_lock_interruptible(dev);
858 if (ret) {
859 mutex_lock(&dev->struct_mutex);
860 goto err;
861 }
862
863 /* reacquire the objects */
864 eb_reset(eb);
865 ret = eb_lookup_vmas(eb, exec, args, vm, file);
866 if (ret)
867 goto err;
868
869 need_relocs = (args->flags & I915_EXEC_NO_RELOC) == 0;
870 ret = i915_gem_execbuffer_reserve(ring, &eb->vmas, &need_relocs);
871 if (ret)
872 goto err;
873
874 list_for_each_entry(vma, &eb->vmas, exec_list) {
875 int offset = vma->exec_entry - exec;
876 ret = i915_gem_execbuffer_relocate_vma_slow(vma, eb,
877 reloc + reloc_offset[offset]);
878 if (ret)
879 goto err;
880 }
881
882 /* Leave the user relocations as are, this is the painfully slow path,
883 * and we want to avoid the complication of dropping the lock whilst
884 * having buffers reserved in the aperture and so causing spurious
885 * ENOSPC for random operations.
886 */
887
888 err:
889 drm_free_large(reloc);
890 drm_free_large(reloc_offset);
891 return ret;
892 }
893
894 static int
895 i915_gem_execbuffer_move_to_gpu(struct intel_engine_cs *ring,
896 struct list_head *vmas)
897 {
898 struct i915_vma *vma;
899 uint32_t flush_domains = 0;
900 bool flush_chipset = false;
901 int ret;
902
903 list_for_each_entry(vma, vmas, exec_list) {
904 struct drm_i915_gem_object *obj = vma->obj;
905 ret = i915_gem_object_sync(obj, ring);
906 if (ret)
907 return ret;
908
909 if (obj->base.write_domain & I915_GEM_DOMAIN_CPU)
910 flush_chipset |= i915_gem_clflush_object(obj, false);
911
912 flush_domains |= obj->base.write_domain;
913 }
914
915 if (flush_chipset)
916 i915_gem_chipset_flush(ring->dev);
917
918 if (flush_domains & I915_GEM_DOMAIN_GTT)
919 wmb();
920
921 /* Unconditionally invalidate gpu caches and ensure that we do flush
922 * any residual writes from the previous batch.
923 */
924 return intel_ring_invalidate_all_caches(ring);
925 }
926
927 static bool
928 i915_gem_check_execbuffer(struct drm_i915_gem_execbuffer2 *exec)
929 {
930 if (exec->flags & __I915_EXEC_UNKNOWN_FLAGS)
931 return false;
932
933 return ((exec->batch_start_offset | exec->batch_len) & 0x7) == 0;
934 }
935
936 static int
937 validate_exec_list(struct drm_device *dev,
938 struct drm_i915_gem_exec_object2 *exec,
939 int count)
940 {
941 unsigned relocs_total = 0;
942 unsigned relocs_max = UINT_MAX / sizeof(struct drm_i915_gem_relocation_entry);
943 unsigned invalid_flags;
944 int i;
945
946 invalid_flags = __EXEC_OBJECT_UNKNOWN_FLAGS;
947 if (USES_FULL_PPGTT(dev))
948 invalid_flags |= EXEC_OBJECT_NEEDS_GTT;
949
950 for (i = 0; i < count; i++) {
951 char __user *ptr = to_user_ptr(exec[i].relocs_ptr);
952 int length; /* limited by fault_in_pages_readable() */
953
954 if (exec[i].flags & invalid_flags)
955 return -EINVAL;
956
957 /* First check for malicious input causing overflow in
958 * the worst case where we need to allocate the entire
959 * relocation tree as a single array.
960 */
961 if (exec[i].relocation_count > relocs_max - relocs_total)
962 return -EINVAL;
963 relocs_total += exec[i].relocation_count;
964
965 length = exec[i].relocation_count *
966 sizeof(struct drm_i915_gem_relocation_entry);
967 /*
968 * We must check that the entire relocation array is safe
969 * to read, but since we may need to update the presumed
970 * offsets during execution, check for full write access.
971 */
972 if (!access_ok(VERIFY_WRITE, ptr, length))
973 return -EFAULT;
974
975 if (likely(!i915.prefault_disable)) {
976 if (fault_in_multipages_readable(ptr, length))
977 return -EFAULT;
978 }
979 }
980
981 return 0;
982 }
983
984 static struct intel_context *
985 i915_gem_validate_context(struct drm_device *dev, struct drm_file *file,
986 struct intel_engine_cs *ring, const u32 ctx_id)
987 {
988 struct intel_context *ctx = NULL;
989 struct i915_ctx_hang_stats *hs;
990
991 if (ring->id != RCS && ctx_id != DEFAULT_CONTEXT_HANDLE)
992 return ERR_PTR(-EINVAL);
993
994 ctx = i915_gem_context_get(file->driver_priv, ctx_id);
995 if (IS_ERR(ctx))
996 return ctx;
997
998 hs = &ctx->hang_stats;
999 if (hs->banned) {
1000 DRM_DEBUG("Context %u tried to submit while banned\n", ctx_id);
1001 return ERR_PTR(-EIO);
1002 }
1003
1004 if (i915.enable_execlists && !ctx->engine[ring->id].state) {
1005 int ret = intel_lr_context_deferred_create(ctx, ring);
1006 if (ret) {
1007 DRM_DEBUG("Could not create LRC %u: %d\n", ctx_id, ret);
1008 return ERR_PTR(ret);
1009 }
1010 }
1011
1012 return ctx;
1013 }
1014
1015 void
1016 i915_gem_execbuffer_move_to_active(struct list_head *vmas,
1017 struct intel_engine_cs *ring)
1018 {
1019 struct drm_i915_gem_request *req = intel_ring_get_request(ring);
1020 struct i915_vma *vma;
1021
1022 list_for_each_entry(vma, vmas, exec_list) {
1023 struct drm_i915_gem_exec_object2 *entry = vma->exec_entry;
1024 struct drm_i915_gem_object *obj = vma->obj;
1025 u32 old_read = obj->base.read_domains;
1026 u32 old_write = obj->base.write_domain;
1027
1028 obj->base.write_domain = obj->base.pending_write_domain;
1029 if (obj->base.write_domain == 0)
1030 obj->base.pending_read_domains |= obj->base.read_domains;
1031 obj->base.read_domains = obj->base.pending_read_domains;
1032
1033 i915_vma_move_to_active(vma, ring);
1034 if (obj->base.write_domain) {
1035 obj->dirty = 1;
1036 i915_gem_request_assign(&obj->last_write_req, req);
1037
1038 intel_fb_obj_invalidate(obj, ring, ORIGIN_CS);
1039
1040 /* update for the implicit flush after a batch */
1041 obj->base.write_domain &= ~I915_GEM_GPU_DOMAINS;
1042 }
1043 if (entry->flags & EXEC_OBJECT_NEEDS_FENCE) {
1044 i915_gem_request_assign(&obj->last_fenced_req, req);
1045 if (entry->flags & __EXEC_OBJECT_HAS_FENCE) {
1046 struct drm_i915_private *dev_priv = to_i915(ring->dev);
1047 list_move_tail(&dev_priv->fence_regs[obj->fence_reg].lru_list,
1048 &dev_priv->mm.fence_list);
1049 }
1050 }
1051
1052 trace_i915_gem_object_change_domain(obj, old_read, old_write);
1053 }
1054 }
1055
1056 void
1057 i915_gem_execbuffer_retire_commands(struct drm_device *dev,
1058 struct drm_file *file,
1059 struct intel_engine_cs *ring,
1060 struct drm_i915_gem_object *obj)
1061 {
1062 /* Unconditionally force add_request to emit a full flush. */
1063 ring->gpu_caches_dirty = true;
1064
1065 /* Add a breadcrumb for the completion of the batch buffer */
1066 (void)__i915_add_request(ring, file, obj);
1067 }
1068
1069 static int
1070 i915_reset_gen7_sol_offsets(struct drm_device *dev,
1071 struct intel_engine_cs *ring)
1072 {
1073 struct drm_i915_private *dev_priv = dev->dev_private;
1074 int ret, i;
1075
1076 if (!IS_GEN7(dev) || ring != &dev_priv->ring[RCS]) {
1077 DRM_DEBUG("sol reset is gen7/rcs only\n");
1078 return -EINVAL;
1079 }
1080
1081 ret = intel_ring_begin(ring, 4 * 3);
1082 if (ret)
1083 return ret;
1084
1085 for (i = 0; i < 4; i++) {
1086 intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
1087 intel_ring_emit(ring, GEN7_SO_WRITE_OFFSET(i));
1088 intel_ring_emit(ring, 0);
1089 }
1090
1091 intel_ring_advance(ring);
1092
1093 return 0;
1094 }
1095
1096 static int
1097 i915_emit_box(struct intel_engine_cs *ring,
1098 struct drm_clip_rect *box,
1099 int DR1, int DR4)
1100 {
1101 int ret;
1102
1103 if (box->y2 <= box->y1 || box->x2 <= box->x1 ||
1104 box->y2 <= 0 || box->x2 <= 0) {
1105 DRM_ERROR("Bad box %d,%d..%d,%d\n",
1106 box->x1, box->y1, box->x2, box->y2);
1107 return -EINVAL;
1108 }
1109
1110 if (INTEL_INFO(ring->dev)->gen >= 4) {
1111 ret = intel_ring_begin(ring, 4);
1112 if (ret)
1113 return ret;
1114
1115 intel_ring_emit(ring, GFX_OP_DRAWRECT_INFO_I965);
1116 intel_ring_emit(ring, (box->x1 & 0xffff) | box->y1 << 16);
1117 intel_ring_emit(ring, ((box->x2 - 1) & 0xffff) | (box->y2 - 1) << 16);
1118 intel_ring_emit(ring, DR4);
1119 } else {
1120 ret = intel_ring_begin(ring, 6);
1121 if (ret)
1122 return ret;
1123
1124 intel_ring_emit(ring, GFX_OP_DRAWRECT_INFO);
1125 intel_ring_emit(ring, DR1);
1126 intel_ring_emit(ring, (box->x1 & 0xffff) | box->y1 << 16);
1127 intel_ring_emit(ring, ((box->x2 - 1) & 0xffff) | (box->y2 - 1) << 16);
1128 intel_ring_emit(ring, DR4);
1129 intel_ring_emit(ring, 0);
1130 }
1131 intel_ring_advance(ring);
1132
1133 return 0;
1134 }
1135
1136 static struct drm_i915_gem_object*
1137 i915_gem_execbuffer_parse(struct intel_engine_cs *ring,
1138 struct drm_i915_gem_exec_object2 *shadow_exec_entry,
1139 struct eb_vmas *eb,
1140 struct drm_i915_gem_object *batch_obj,
1141 u32 batch_start_offset,
1142 u32 batch_len,
1143 bool is_master)
1144 {
1145 struct drm_i915_private *dev_priv = to_i915(batch_obj->base.dev);
1146 struct drm_i915_gem_object *shadow_batch_obj;
1147 struct i915_vma *vma;
1148 int ret;
1149
1150 shadow_batch_obj = i915_gem_batch_pool_get(&dev_priv->mm.batch_pool,
1151 PAGE_ALIGN(batch_len));
1152 if (IS_ERR(shadow_batch_obj))
1153 return shadow_batch_obj;
1154
1155 ret = i915_parse_cmds(ring,
1156 batch_obj,
1157 shadow_batch_obj,
1158 batch_start_offset,
1159 batch_len,
1160 is_master);
1161 if (ret)
1162 goto err;
1163
1164 ret = i915_gem_obj_ggtt_pin(shadow_batch_obj, 0, 0);
1165 if (ret)
1166 goto err;
1167
1168 memset(shadow_exec_entry, 0, sizeof(*shadow_exec_entry));
1169
1170 vma = i915_gem_obj_to_ggtt(shadow_batch_obj);
1171 vma->exec_entry = shadow_exec_entry;
1172 vma->exec_entry->flags = __EXEC_OBJECT_PURGEABLE | __EXEC_OBJECT_HAS_PIN;
1173 drm_gem_object_reference(&shadow_batch_obj->base);
1174 list_add_tail(&vma->exec_list, &eb->vmas);
1175
1176 shadow_batch_obj->base.pending_read_domains = I915_GEM_DOMAIN_COMMAND;
1177
1178 return shadow_batch_obj;
1179
1180 err:
1181 if (ret == -EACCES) /* unhandled chained batch */
1182 return batch_obj;
1183 else
1184 return ERR_PTR(ret);
1185 }
1186
1187 int
1188 i915_gem_ringbuffer_submission(struct drm_device *dev, struct drm_file *file,
1189 struct intel_engine_cs *ring,
1190 struct intel_context *ctx,
1191 struct drm_i915_gem_execbuffer2 *args,
1192 struct list_head *vmas,
1193 struct drm_i915_gem_object *batch_obj,
1194 u64 exec_start, u32 dispatch_flags)
1195 {
1196 struct drm_clip_rect *cliprects = NULL;
1197 struct drm_i915_private *dev_priv = dev->dev_private;
1198 u64 exec_len;
1199 int instp_mode;
1200 u32 instp_mask;
1201 int i, ret = 0;
1202
1203 if (args->num_cliprects != 0) {
1204 if (ring != &dev_priv->ring[RCS]) {
1205 DRM_DEBUG("clip rectangles are only valid with the render ring\n");
1206 return -EINVAL;
1207 }
1208
1209 if (INTEL_INFO(dev)->gen >= 5) {
1210 DRM_DEBUG("clip rectangles are only valid on pre-gen5\n");
1211 return -EINVAL;
1212 }
1213
1214 if (args->num_cliprects > UINT_MAX / sizeof(*cliprects)) {
1215 DRM_DEBUG("execbuf with %u cliprects\n",
1216 args->num_cliprects);
1217 return -EINVAL;
1218 }
1219
1220 cliprects = kcalloc(args->num_cliprects,
1221 sizeof(*cliprects),
1222 GFP_KERNEL);
1223 if (cliprects == NULL) {
1224 ret = -ENOMEM;
1225 goto error;
1226 }
1227
1228 if (copy_from_user(cliprects,
1229 to_user_ptr(args->cliprects_ptr),
1230 sizeof(*cliprects)*args->num_cliprects)) {
1231 ret = -EFAULT;
1232 goto error;
1233 }
1234 } else {
1235 if (args->DR4 == 0xffffffff) {
1236 DRM_DEBUG("UXA submitting garbage DR4, fixing up\n");
1237 args->DR4 = 0;
1238 }
1239
1240 if (args->DR1 || args->DR4 || args->cliprects_ptr) {
1241 DRM_DEBUG("0 cliprects but dirt in cliprects fields\n");
1242 return -EINVAL;
1243 }
1244 }
1245
1246 ret = i915_gem_execbuffer_move_to_gpu(ring, vmas);
1247 if (ret)
1248 goto error;
1249
1250 ret = i915_switch_context(ring, ctx);
1251 if (ret)
1252 goto error;
1253
1254 if (ctx->ppgtt)
1255 WARN(ctx->ppgtt->pd_dirty_rings & (1<<ring->id),
1256 "%s didn't clear reload\n", ring->name);
1257 else if (dev_priv->mm.aliasing_ppgtt)
1258 WARN(dev_priv->mm.aliasing_ppgtt->pd_dirty_rings &
1259 (1<<ring->id), "%s didn't clear reload\n", ring->name);
1260
1261 instp_mode = args->flags & I915_EXEC_CONSTANTS_MASK;
1262 instp_mask = I915_EXEC_CONSTANTS_MASK;
1263 switch (instp_mode) {
1264 case I915_EXEC_CONSTANTS_REL_GENERAL:
1265 case I915_EXEC_CONSTANTS_ABSOLUTE:
1266 case I915_EXEC_CONSTANTS_REL_SURFACE:
1267 if (instp_mode != 0 && ring != &dev_priv->ring[RCS]) {
1268 DRM_DEBUG("non-0 rel constants mode on non-RCS\n");
1269 ret = -EINVAL;
1270 goto error;
1271 }
1272
1273 if (instp_mode != dev_priv->relative_constants_mode) {
1274 if (INTEL_INFO(dev)->gen < 4) {
1275 DRM_DEBUG("no rel constants on pre-gen4\n");
1276 ret = -EINVAL;
1277 goto error;
1278 }
1279
1280 if (INTEL_INFO(dev)->gen > 5 &&
1281 instp_mode == I915_EXEC_CONSTANTS_REL_SURFACE) {
1282 DRM_DEBUG("rel surface constants mode invalid on gen5+\n");
1283 ret = -EINVAL;
1284 goto error;
1285 }
1286
1287 /* The HW changed the meaning on this bit on gen6 */
1288 if (INTEL_INFO(dev)->gen >= 6)
1289 instp_mask &= ~I915_EXEC_CONSTANTS_REL_SURFACE;
1290 }
1291 break;
1292 default:
1293 DRM_DEBUG("execbuf with unknown constants: %d\n", instp_mode);
1294 ret = -EINVAL;
1295 goto error;
1296 }
1297
1298 if (ring == &dev_priv->ring[RCS] &&
1299 instp_mode != dev_priv->relative_constants_mode) {
1300 ret = intel_ring_begin(ring, 4);
1301 if (ret)
1302 goto error;
1303
1304 intel_ring_emit(ring, MI_NOOP);
1305 intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
1306 intel_ring_emit(ring, INSTPM);
1307 intel_ring_emit(ring, instp_mask << 16 | instp_mode);
1308 intel_ring_advance(ring);
1309
1310 dev_priv->relative_constants_mode = instp_mode;
1311 }
1312
1313 if (args->flags & I915_EXEC_GEN7_SOL_RESET) {
1314 ret = i915_reset_gen7_sol_offsets(dev, ring);
1315 if (ret)
1316 goto error;
1317 }
1318
1319 exec_len = args->batch_len;
1320 if (cliprects) {
1321 for (i = 0; i < args->num_cliprects; i++) {
1322 ret = i915_emit_box(ring, &cliprects[i],
1323 args->DR1, args->DR4);
1324 if (ret)
1325 goto error;
1326
1327 ret = ring->dispatch_execbuffer(ring,
1328 exec_start, exec_len,
1329 dispatch_flags);
1330 if (ret)
1331 goto error;
1332 }
1333 } else {
1334 ret = ring->dispatch_execbuffer(ring,
1335 exec_start, exec_len,
1336 dispatch_flags);
1337 if (ret)
1338 return ret;
1339 }
1340
1341 trace_i915_gem_ring_dispatch(intel_ring_get_request(ring), dispatch_flags);
1342
1343 i915_gem_execbuffer_move_to_active(vmas, ring);
1344 i915_gem_execbuffer_retire_commands(dev, file, ring, batch_obj);
1345
1346 error:
1347 kfree(cliprects);
1348 return ret;
1349 }
1350
1351 /**
1352 * Find one BSD ring to dispatch the corresponding BSD command.
1353 * The Ring ID is returned.
1354 */
1355 static int gen8_dispatch_bsd_ring(struct drm_device *dev,
1356 struct drm_file *file)
1357 {
1358 struct drm_i915_private *dev_priv = dev->dev_private;
1359 struct drm_i915_file_private *file_priv = file->driver_priv;
1360
1361 /* Check whether the file_priv is using one ring */
1362 if (file_priv->bsd_ring)
1363 return file_priv->bsd_ring->id;
1364 else {
1365 /* If no, use the ping-pong mechanism to select one ring */
1366 int ring_id;
1367
1368 mutex_lock(&dev->struct_mutex);
1369 if (dev_priv->mm.bsd_ring_dispatch_index == 0) {
1370 ring_id = VCS;
1371 dev_priv->mm.bsd_ring_dispatch_index = 1;
1372 } else {
1373 ring_id = VCS2;
1374 dev_priv->mm.bsd_ring_dispatch_index = 0;
1375 }
1376 file_priv->bsd_ring = &dev_priv->ring[ring_id];
1377 mutex_unlock(&dev->struct_mutex);
1378 return ring_id;
1379 }
1380 }
1381
1382 static struct drm_i915_gem_object *
1383 eb_get_batch(struct eb_vmas *eb)
1384 {
1385 struct i915_vma *vma = list_entry(eb->vmas.prev, typeof(*vma), exec_list);
1386
1387 /*
1388 * SNA is doing fancy tricks with compressing batch buffers, which leads
1389 * to negative relocation deltas. Usually that works out ok since the
1390 * relocate address is still positive, except when the batch is placed
1391 * very low in the GTT. Ensure this doesn't happen.
1392 *
1393 * Note that actual hangs have only been observed on gen7, but for
1394 * paranoia do it everywhere.
1395 */
1396 vma->exec_entry->flags |= __EXEC_OBJECT_NEEDS_BIAS;
1397
1398 return vma->obj;
1399 }
1400
1401 static int
1402 i915_gem_do_execbuffer(struct drm_device *dev, void *data,
1403 struct drm_file *file,
1404 struct drm_i915_gem_execbuffer2 *args,
1405 struct drm_i915_gem_exec_object2 *exec)
1406 {
1407 struct drm_i915_private *dev_priv = dev->dev_private;
1408 struct eb_vmas *eb;
1409 struct drm_i915_gem_object *batch_obj;
1410 struct drm_i915_gem_exec_object2 shadow_exec_entry;
1411 struct intel_engine_cs *ring;
1412 struct intel_context *ctx;
1413 struct i915_address_space *vm;
1414 const u32 ctx_id = i915_execbuffer2_get_context_id(*args);
1415 u64 exec_start = args->batch_start_offset;
1416 u32 dispatch_flags;
1417 int ret;
1418 bool need_relocs;
1419
1420 if (!i915_gem_check_execbuffer(args))
1421 return -EINVAL;
1422
1423 ret = validate_exec_list(dev, exec, args->buffer_count);
1424 if (ret)
1425 return ret;
1426
1427 dispatch_flags = 0;
1428 if (args->flags & I915_EXEC_SECURE) {
1429 if (!file->is_master || !capable(CAP_SYS_ADMIN))
1430 return -EPERM;
1431
1432 dispatch_flags |= I915_DISPATCH_SECURE;
1433 }
1434 if (args->flags & I915_EXEC_IS_PINNED)
1435 dispatch_flags |= I915_DISPATCH_PINNED;
1436
1437 if ((args->flags & I915_EXEC_RING_MASK) > LAST_USER_RING) {
1438 DRM_DEBUG("execbuf with unknown ring: %d\n",
1439 (int)(args->flags & I915_EXEC_RING_MASK));
1440 return -EINVAL;
1441 }
1442
1443 if (((args->flags & I915_EXEC_RING_MASK) != I915_EXEC_BSD) &&
1444 ((args->flags & I915_EXEC_BSD_MASK) != 0)) {
1445 DRM_DEBUG("execbuf with non bsd ring but with invalid "
1446 "bsd dispatch flags: %d\n", (int)(args->flags));
1447 return -EINVAL;
1448 }
1449
1450 if ((args->flags & I915_EXEC_RING_MASK) == I915_EXEC_DEFAULT)
1451 ring = &dev_priv->ring[RCS];
1452 else if ((args->flags & I915_EXEC_RING_MASK) == I915_EXEC_BSD) {
1453 if (HAS_BSD2(dev)) {
1454 int ring_id;
1455
1456 switch (args->flags & I915_EXEC_BSD_MASK) {
1457 case I915_EXEC_BSD_DEFAULT:
1458 ring_id = gen8_dispatch_bsd_ring(dev, file);
1459 ring = &dev_priv->ring[ring_id];
1460 break;
1461 case I915_EXEC_BSD_RING1:
1462 ring = &dev_priv->ring[VCS];
1463 break;
1464 case I915_EXEC_BSD_RING2:
1465 ring = &dev_priv->ring[VCS2];
1466 break;
1467 default:
1468 DRM_DEBUG("execbuf with unknown bsd ring: %d\n",
1469 (int)(args->flags & I915_EXEC_BSD_MASK));
1470 return -EINVAL;
1471 }
1472 } else
1473 ring = &dev_priv->ring[VCS];
1474 } else
1475 ring = &dev_priv->ring[(args->flags & I915_EXEC_RING_MASK) - 1];
1476
1477 if (!intel_ring_initialized(ring)) {
1478 DRM_DEBUG("execbuf with invalid ring: %d\n",
1479 (int)(args->flags & I915_EXEC_RING_MASK));
1480 return -EINVAL;
1481 }
1482
1483 if (args->buffer_count < 1) {
1484 DRM_DEBUG("execbuf with %d buffers\n", args->buffer_count);
1485 return -EINVAL;
1486 }
1487
1488 intel_runtime_pm_get(dev_priv);
1489
1490 ret = i915_mutex_lock_interruptible(dev);
1491 if (ret)
1492 goto pre_mutex_err;
1493
1494 ctx = i915_gem_validate_context(dev, file, ring, ctx_id);
1495 if (IS_ERR(ctx)) {
1496 mutex_unlock(&dev->struct_mutex);
1497 ret = PTR_ERR(ctx);
1498 goto pre_mutex_err;
1499 }
1500
1501 i915_gem_context_reference(ctx);
1502
1503 if (ctx->ppgtt)
1504 vm = &ctx->ppgtt->base;
1505 else
1506 vm = &dev_priv->gtt.base;
1507
1508 eb = eb_create(args);
1509 if (eb == NULL) {
1510 i915_gem_context_unreference(ctx);
1511 mutex_unlock(&dev->struct_mutex);
1512 ret = -ENOMEM;
1513 goto pre_mutex_err;
1514 }
1515
1516 /* Look up object handles */
1517 ret = eb_lookup_vmas(eb, exec, args, vm, file);
1518 if (ret)
1519 goto err;
1520
1521 /* take note of the batch buffer before we might reorder the lists */
1522 batch_obj = eb_get_batch(eb);
1523
1524 /* Move the objects en-masse into the GTT, evicting if necessary. */
1525 need_relocs = (args->flags & I915_EXEC_NO_RELOC) == 0;
1526 ret = i915_gem_execbuffer_reserve(ring, &eb->vmas, &need_relocs);
1527 if (ret)
1528 goto err;
1529
1530 /* The objects are in their final locations, apply the relocations. */
1531 if (need_relocs)
1532 ret = i915_gem_execbuffer_relocate(eb);
1533 if (ret) {
1534 if (ret == -EFAULT) {
1535 ret = i915_gem_execbuffer_relocate_slow(dev, args, file, ring,
1536 eb, exec);
1537 BUG_ON(!mutex_is_locked(&dev->struct_mutex));
1538 }
1539 if (ret)
1540 goto err;
1541 }
1542
1543 /* Set the pending read domains for the batch buffer to COMMAND */
1544 if (batch_obj->base.pending_write_domain) {
1545 DRM_DEBUG("Attempting to use self-modifying batch buffer\n");
1546 ret = -EINVAL;
1547 goto err;
1548 }
1549
1550 if (i915_needs_cmd_parser(ring) && args->batch_len) {
1551 batch_obj = i915_gem_execbuffer_parse(ring,
1552 &shadow_exec_entry,
1553 eb,
1554 batch_obj,
1555 args->batch_start_offset,
1556 args->batch_len,
1557 file->is_master);
1558 if (IS_ERR(batch_obj)) {
1559 ret = PTR_ERR(batch_obj);
1560 goto err;
1561 }
1562
1563 /*
1564 * Set the DISPATCH_SECURE bit to remove the NON_SECURE
1565 * bit from MI_BATCH_BUFFER_START commands issued in the
1566 * dispatch_execbuffer implementations. We specifically
1567 * don't want that set when the command parser is
1568 * enabled.
1569 *
1570 * FIXME: with aliasing ppgtt, buffers that should only
1571 * be in ggtt still end up in the aliasing ppgtt. remove
1572 * this check when that is fixed.
1573 */
1574 if (USES_FULL_PPGTT(dev))
1575 dispatch_flags |= I915_DISPATCH_SECURE;
1576
1577 exec_start = 0;
1578 }
1579
1580 batch_obj->base.pending_read_domains |= I915_GEM_DOMAIN_COMMAND;
1581
1582 /* snb/ivb/vlv conflate the "batch in ppgtt" bit with the "non-secure
1583 * batch" bit. Hence we need to pin secure batches into the global gtt.
1584 * hsw should have this fixed, but bdw mucks it up again. */
1585 if (dispatch_flags & I915_DISPATCH_SECURE) {
1586 /*
1587 * So on first glance it looks freaky that we pin the batch here
1588 * outside of the reservation loop. But:
1589 * - The batch is already pinned into the relevant ppgtt, so we
1590 * already have the backing storage fully allocated.
1591 * - No other BO uses the global gtt (well contexts, but meh),
1592 * so we don't really have issues with multiple objects not
1593 * fitting due to fragmentation.
1594 * So this is actually safe.
1595 */
1596 ret = i915_gem_obj_ggtt_pin(batch_obj, 0, 0);
1597 if (ret)
1598 goto err;
1599
1600 exec_start += i915_gem_obj_ggtt_offset(batch_obj);
1601 } else
1602 exec_start += i915_gem_obj_offset(batch_obj, vm);
1603
1604 ret = dev_priv->gt.do_execbuf(dev, file, ring, ctx, args,
1605 &eb->vmas, batch_obj, exec_start,
1606 dispatch_flags);
1607
1608 /*
1609 * FIXME: We crucially rely upon the active tracking for the (ppgtt)
1610 * batch vma for correctness. For less ugly and less fragility this
1611 * needs to be adjusted to also track the ggtt batch vma properly as
1612 * active.
1613 */
1614 if (dispatch_flags & I915_DISPATCH_SECURE)
1615 i915_gem_object_ggtt_unpin(batch_obj);
1616 err:
1617 /* the request owns the ref now */
1618 i915_gem_context_unreference(ctx);
1619 eb_destroy(eb);
1620
1621 mutex_unlock(&dev->struct_mutex);
1622
1623 pre_mutex_err:
1624 /* intel_gpu_busy should also get a ref, so it will free when the device
1625 * is really idle. */
1626 intel_runtime_pm_put(dev_priv);
1627 return ret;
1628 }
1629
1630 /*
1631 * Legacy execbuffer just creates an exec2 list from the original exec object
1632 * list array and passes it to the real function.
1633 */
1634 int
1635 i915_gem_execbuffer(struct drm_device *dev, void *data,
1636 struct drm_file *file)
1637 {
1638 struct drm_i915_gem_execbuffer *args = data;
1639 struct drm_i915_gem_execbuffer2 exec2;
1640 struct drm_i915_gem_exec_object *exec_list = NULL;
1641 struct drm_i915_gem_exec_object2 *exec2_list = NULL;
1642 int ret, i;
1643
1644 if (args->buffer_count < 1) {
1645 DRM_DEBUG("execbuf with %d buffers\n", args->buffer_count);
1646 return -EINVAL;
1647 }
1648
1649 /* Copy in the exec list from userland */
1650 exec_list = drm_malloc_ab(sizeof(*exec_list), args->buffer_count);
1651 exec2_list = drm_malloc_ab(sizeof(*exec2_list), args->buffer_count);
1652 if (exec_list == NULL || exec2_list == NULL) {
1653 DRM_DEBUG("Failed to allocate exec list for %d buffers\n",
1654 args->buffer_count);
1655 drm_free_large(exec_list);
1656 drm_free_large(exec2_list);
1657 return -ENOMEM;
1658 }
1659 ret = copy_from_user(exec_list,
1660 to_user_ptr(args->buffers_ptr),
1661 sizeof(*exec_list) * args->buffer_count);
1662 if (ret != 0) {
1663 DRM_DEBUG("copy %d exec entries failed %d\n",
1664 args->buffer_count, ret);
1665 drm_free_large(exec_list);
1666 drm_free_large(exec2_list);
1667 return -EFAULT;
1668 }
1669
1670 for (i = 0; i < args->buffer_count; i++) {
1671 exec2_list[i].handle = exec_list[i].handle;
1672 exec2_list[i].relocation_count = exec_list[i].relocation_count;
1673 exec2_list[i].relocs_ptr = exec_list[i].relocs_ptr;
1674 exec2_list[i].alignment = exec_list[i].alignment;
1675 exec2_list[i].offset = exec_list[i].offset;
1676 if (INTEL_INFO(dev)->gen < 4)
1677 exec2_list[i].flags = EXEC_OBJECT_NEEDS_FENCE;
1678 else
1679 exec2_list[i].flags = 0;
1680 }
1681
1682 exec2.buffers_ptr = args->buffers_ptr;
1683 exec2.buffer_count = args->buffer_count;
1684 exec2.batch_start_offset = args->batch_start_offset;
1685 exec2.batch_len = args->batch_len;
1686 exec2.DR1 = args->DR1;
1687 exec2.DR4 = args->DR4;
1688 exec2.num_cliprects = args->num_cliprects;
1689 exec2.cliprects_ptr = args->cliprects_ptr;
1690 exec2.flags = I915_EXEC_RENDER;
1691 i915_execbuffer2_set_context_id(exec2, 0);
1692
1693 ret = i915_gem_do_execbuffer(dev, data, file, &exec2, exec2_list);
1694 if (!ret) {
1695 struct drm_i915_gem_exec_object __user *user_exec_list =
1696 to_user_ptr(args->buffers_ptr);
1697
1698 /* Copy the new buffer offsets back to the user's exec list. */
1699 for (i = 0; i < args->buffer_count; i++) {
1700 ret = __copy_to_user(&user_exec_list[i].offset,
1701 &exec2_list[i].offset,
1702 sizeof(user_exec_list[i].offset));
1703 if (ret) {
1704 ret = -EFAULT;
1705 DRM_DEBUG("failed to copy %d exec entries "
1706 "back to user (%d)\n",
1707 args->buffer_count, ret);
1708 break;
1709 }
1710 }
1711 }
1712
1713 drm_free_large(exec_list);
1714 drm_free_large(exec2_list);
1715 return ret;
1716 }
1717
1718 int
1719 i915_gem_execbuffer2(struct drm_device *dev, void *data,
1720 struct drm_file *file)
1721 {
1722 struct drm_i915_gem_execbuffer2 *args = data;
1723 struct drm_i915_gem_exec_object2 *exec2_list = NULL;
1724 int ret;
1725
1726 if (args->buffer_count < 1 ||
1727 args->buffer_count > UINT_MAX / sizeof(*exec2_list)) {
1728 DRM_DEBUG("execbuf2 with %d buffers\n", args->buffer_count);
1729 return -EINVAL;
1730 }
1731
1732 if (args->rsvd2 != 0) {
1733 DRM_DEBUG("dirty rvsd2 field\n");
1734 return -EINVAL;
1735 }
1736
1737 exec2_list = kmalloc(sizeof(*exec2_list)*args->buffer_count,
1738 GFP_TEMPORARY | __GFP_NOWARN | __GFP_NORETRY);
1739 if (exec2_list == NULL)
1740 exec2_list = drm_malloc_ab(sizeof(*exec2_list),
1741 args->buffer_count);
1742 if (exec2_list == NULL) {
1743 DRM_DEBUG("Failed to allocate exec list for %d buffers\n",
1744 args->buffer_count);
1745 return -ENOMEM;
1746 }
1747 ret = copy_from_user(exec2_list,
1748 to_user_ptr(args->buffers_ptr),
1749 sizeof(*exec2_list) * args->buffer_count);
1750 if (ret != 0) {
1751 DRM_DEBUG("copy %d exec entries failed %d\n",
1752 args->buffer_count, ret);
1753 drm_free_large(exec2_list);
1754 return -EFAULT;
1755 }
1756
1757 ret = i915_gem_do_execbuffer(dev, data, file, args, exec2_list);
1758 if (!ret) {
1759 /* Copy the new buffer offsets back to the user's exec list. */
1760 struct drm_i915_gem_exec_object2 __user *user_exec_list =
1761 to_user_ptr(args->buffers_ptr);
1762 int i;
1763
1764 for (i = 0; i < args->buffer_count; i++) {
1765 ret = __copy_to_user(&user_exec_list[i].offset,
1766 &exec2_list[i].offset,
1767 sizeof(user_exec_list[i].offset));
1768 if (ret) {
1769 ret = -EFAULT;
1770 DRM_DEBUG("failed to copy %d exec entries "
1771 "back to user\n",
1772 args->buffer_count);
1773 break;
1774 }
1775 }
1776 }
1777
1778 drm_free_large(exec2_list);
1779 return ret;
1780 }
Linux kernel - Deliverables
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