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1/*
2 * Copyright © 2008-2012 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
33/*
34 * The BIOS typically reserves some of the system's memory for the exclusive
35 * use of the integrated graphics. This memory is no longer available for
36 * use by the OS and so the user finds that his system has less memory
37 * available than he put in. We refer to this memory as stolen.
38 *
39 * The BIOS will allocate its framebuffer from the stolen memory. Our
40 * goal is try to reuse that object for our own fbcon which must always
41 * be available for panics. Anything else we can reuse the stolen memory
42 * for is a boon.
43 */
44
45int i915_gem_stolen_insert_node_in_range(struct drm_i915_private *dev_priv,
46 struct drm_mm_node *node, u64 size,
47 unsigned alignment, u64 start, u64 end)
48{
49 int ret;
50
51 if (!drm_mm_initialized(&dev_priv->mm.stolen))
52 return -ENODEV;
53
54 mutex_lock(&dev_priv->mm.stolen_lock);
55 ret = drm_mm_insert_node_in_range(&dev_priv->mm.stolen, node,
56 size, alignment, 0,
57 start, end, DRM_MM_INSERT_BEST);
58 mutex_unlock(&dev_priv->mm.stolen_lock);
59
60 return ret;
61}
62
63int i915_gem_stolen_insert_node(struct drm_i915_private *dev_priv,
64 struct drm_mm_node *node, u64 size,
65 unsigned alignment)
66{
67 return i915_gem_stolen_insert_node_in_range(dev_priv, node, size,
68 alignment, 0, U64_MAX);
69}
70
71void i915_gem_stolen_remove_node(struct drm_i915_private *dev_priv,
72 struct drm_mm_node *node)
73{
74 mutex_lock(&dev_priv->mm.stolen_lock);
75 drm_mm_remove_node(node);
76 mutex_unlock(&dev_priv->mm.stolen_lock);
77}
78
79static int i915_adjust_stolen(struct drm_i915_private *dev_priv,
80 struct resource *dsm)
81{
82 struct i915_ggtt *ggtt = &dev_priv->ggtt;
83 struct resource *r;
84
85 if (dsm->start == 0 || dsm->end <= dsm->start)
86 return -EINVAL;
87
88 /*
89 * TODO: We have yet too encounter the case where the GTT wasn't at the
90 * end of stolen. With that assumption we could simplify this.
91 */
92
93 /* Make sure we don't clobber the GTT if it's within stolen memory */
94 if (INTEL_GEN(dev_priv) <= 4 &&
95 !IS_G33(dev_priv) && !IS_PINEVIEW(dev_priv) && !IS_G4X(dev_priv)) {
96 struct resource stolen[2] = {*dsm, *dsm};
97 struct resource ggtt_res;
98 resource_size_t ggtt_start;
99
100 ggtt_start = I915_READ(PGTBL_CTL);
101 if (IS_GEN4(dev_priv))
102 ggtt_start = (ggtt_start & PGTBL_ADDRESS_LO_MASK) |
103 (ggtt_start & PGTBL_ADDRESS_HI_MASK) << 28;
104 else
105 ggtt_start &= PGTBL_ADDRESS_LO_MASK;
106
107 ggtt_res =
108 (struct resource) DEFINE_RES_MEM(ggtt_start,
109 ggtt_total_entries(ggtt) * 4);
110
111 if (ggtt_res.start >= stolen[0].start && ggtt_res.start < stolen[0].end)
112 stolen[0].end = ggtt_res.start;
113 if (ggtt_res.end > stolen[1].start && ggtt_res.end <= stolen[1].end)
114 stolen[1].start = ggtt_res.end;
115
116 /* Pick the larger of the two chunks */
117 if (resource_size(&stolen[0]) > resource_size(&stolen[1]))
118 *dsm = stolen[0];
119 else
120 *dsm = stolen[1];
121
122 if (stolen[0].start != stolen[1].start ||
123 stolen[0].end != stolen[1].end) {
124 DRM_DEBUG_KMS("GTT within stolen memory at %pR\n", &ggtt_res);
125 DRM_DEBUG_KMS("Stolen memory adjusted to %pR\n", dsm);
126 }
127 }
128
129 /*
130 * Verify that nothing else uses this physical address. Stolen
131 * memory should be reserved by the BIOS and hidden from the
132 * kernel. So if the region is already marked as busy, something
133 * is seriously wrong.
134 */
135 r = devm_request_mem_region(dev_priv->drm.dev, dsm->start,
136 resource_size(dsm),
137 "Graphics Stolen Memory");
138 if (r == NULL) {
139 /*
140 * One more attempt but this time requesting region from
141 * start + 1, as we have seen that this resolves the region
142 * conflict with the PCI Bus.
143 * This is a BIOS w/a: Some BIOS wrap stolen in the root
144 * PCI bus, but have an off-by-one error. Hence retry the
145 * reservation starting from 1 instead of 0.
146 * There's also BIOS with off-by-one on the other end.
147 */
148 r = devm_request_mem_region(dev_priv->drm.dev, dsm->start + 1,
149 resource_size(dsm) - 2,
150 "Graphics Stolen Memory");
151 /*
152 * GEN3 firmware likes to smash pci bridges into the stolen
153 * range. Apparently this works.
154 */
155 if (r == NULL && !IS_GEN3(dev_priv)) {
156 DRM_ERROR("conflict detected with stolen region: %pR\n",
157 dsm);
158
159 return -EBUSY;
160 }
161 }
162
163 return 0;
164}
165
166void i915_gem_cleanup_stolen(struct drm_device *dev)
167{
168 struct drm_i915_private *dev_priv = to_i915(dev);
169
170 if (!drm_mm_initialized(&dev_priv->mm.stolen))
171 return;
172
173 drm_mm_takedown(&dev_priv->mm.stolen);
174}
175
176static void g4x_get_stolen_reserved(struct drm_i915_private *dev_priv,
177 resource_size_t *base, resource_size_t *size)
178{
179 uint32_t reg_val = I915_READ(IS_GM45(dev_priv) ?
180 CTG_STOLEN_RESERVED :
181 ELK_STOLEN_RESERVED);
182 resource_size_t stolen_top = dev_priv->dsm.end + 1;
183
184 if ((reg_val & G4X_STOLEN_RESERVED_ENABLE) == 0) {
185 *base = 0;
186 *size = 0;
187 return;
188 }
189
190 /*
191 * Whether ILK really reuses the ELK register for this is unclear.
192 * Let's see if we catch anyone with this supposedly enabled on ILK.
193 */
194 WARN(IS_GEN5(dev_priv), "ILK stolen reserved found? 0x%08x\n", reg_val);
195
196 *base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16;
197
198 WARN_ON((reg_val & G4X_STOLEN_RESERVED_ADDR1_MASK) < *base);
199
200 /* On these platforms, the register doesn't have a size field, so the
201 * size is the distance between the base and the top of the stolen
202 * memory. We also have the genuine case where base is zero and there's
203 * nothing reserved. */
204 if (*base == 0)
205 *size = 0;
206 else
207 *size = stolen_top - *base;
208}
209
210static void gen6_get_stolen_reserved(struct drm_i915_private *dev_priv,
211 resource_size_t *base, resource_size_t *size)
212{
213 uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
214
215 if ((reg_val & GEN6_STOLEN_RESERVED_ENABLE) == 0) {
216 *base = 0;
217 *size = 0;
218 return;
219 }
220
221 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
222
223 switch (reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK) {
224 case GEN6_STOLEN_RESERVED_1M:
225 *size = 1024 * 1024;
226 break;
227 case GEN6_STOLEN_RESERVED_512K:
228 *size = 512 * 1024;
229 break;
230 case GEN6_STOLEN_RESERVED_256K:
231 *size = 256 * 1024;
232 break;
233 case GEN6_STOLEN_RESERVED_128K:
234 *size = 128 * 1024;
235 break;
236 default:
237 *size = 1024 * 1024;
238 MISSING_CASE(reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK);
239 }
240}
241
242static void gen7_get_stolen_reserved(struct drm_i915_private *dev_priv,
243 resource_size_t *base, resource_size_t *size)
244{
245 uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
246
247 if ((reg_val & GEN6_STOLEN_RESERVED_ENABLE) == 0) {
248 *base = 0;
249 *size = 0;
250 return;
251 }
252
253 *base = reg_val & GEN7_STOLEN_RESERVED_ADDR_MASK;
254
255 switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) {
256 case GEN7_STOLEN_RESERVED_1M:
257 *size = 1024 * 1024;
258 break;
259 case GEN7_STOLEN_RESERVED_256K:
260 *size = 256 * 1024;
261 break;
262 default:
263 *size = 1024 * 1024;
264 MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK);
265 }
266}
267
268static void chv_get_stolen_reserved(struct drm_i915_private *dev_priv,
269 resource_size_t *base, resource_size_t *size)
270{
271 uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
272
273 if ((reg_val & GEN6_STOLEN_RESERVED_ENABLE) == 0) {
274 *base = 0;
275 *size = 0;
276 return;
277 }
278
279 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
280
281 switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) {
282 case GEN8_STOLEN_RESERVED_1M:
283 *size = 1024 * 1024;
284 break;
285 case GEN8_STOLEN_RESERVED_2M:
286 *size = 2 * 1024 * 1024;
287 break;
288 case GEN8_STOLEN_RESERVED_4M:
289 *size = 4 * 1024 * 1024;
290 break;
291 case GEN8_STOLEN_RESERVED_8M:
292 *size = 8 * 1024 * 1024;
293 break;
294 default:
295 *size = 8 * 1024 * 1024;
296 MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK);
297 }
298}
299
300static void bdw_get_stolen_reserved(struct drm_i915_private *dev_priv,
301 resource_size_t *base, resource_size_t *size)
302{
303 uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
304 resource_size_t stolen_top;
305
306 if ((reg_val & GEN6_STOLEN_RESERVED_ENABLE) == 0) {
307 *base = 0;
308 *size = 0;
309 return;
310 }
311
312 stolen_top = dev_priv->dsm.end + 1;
313
314 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
315
316 /* On these platforms, the register doesn't have a size field, so the
317 * size is the distance between the base and the top of the stolen
318 * memory. We also have the genuine case where base is zero and there's
319 * nothing reserved. */
320 if (*base == 0)
321 *size = 0;
322 else
323 *size = stolen_top - *base;
324}
325
326int i915_gem_init_stolen(struct drm_i915_private *dev_priv)
327{
328 resource_size_t reserved_base, stolen_top;
329 resource_size_t reserved_total, reserved_size;
330 resource_size_t stolen_usable_start;
331
332 mutex_init(&dev_priv->mm.stolen_lock);
333
334 if (intel_vgpu_active(dev_priv)) {
335 DRM_INFO("iGVT-g active, disabling use of stolen memory\n");
336 return 0;
337 }
338
339 if (intel_vtd_active() && INTEL_GEN(dev_priv) < 8) {
340 DRM_INFO("DMAR active, disabling use of stolen memory\n");
341 return 0;
342 }
343
344 if (resource_size(&intel_graphics_stolen_res) == 0)
345 return 0;
346
347 dev_priv->dsm = intel_graphics_stolen_res;
348
349 if (i915_adjust_stolen(dev_priv, &dev_priv->dsm))
350 return 0;
351
352 GEM_BUG_ON(dev_priv->dsm.start == 0);
353 GEM_BUG_ON(dev_priv->dsm.end <= dev_priv->dsm.start);
354
355 stolen_top = dev_priv->dsm.end + 1;
356 reserved_base = 0;
357 reserved_size = 0;
358
359 switch (INTEL_GEN(dev_priv)) {
360 case 2:
361 case 3:
362 break;
363 case 4:
364 if (!IS_G4X(dev_priv))
365 break;
366 /* fall through */
367 case 5:
368 g4x_get_stolen_reserved(dev_priv,
369 &reserved_base, &reserved_size);
370 break;
371 case 6:
372 gen6_get_stolen_reserved(dev_priv,
373 &reserved_base, &reserved_size);
374 break;
375 case 7:
376 gen7_get_stolen_reserved(dev_priv,
377 &reserved_base, &reserved_size);
378 break;
379 default:
380 if (IS_LP(dev_priv))
381 chv_get_stolen_reserved(dev_priv,
382 &reserved_base, &reserved_size);
383 else
384 bdw_get_stolen_reserved(dev_priv,
385 &reserved_base, &reserved_size);
386 break;
387 }
388
389 /* It is possible for the reserved base to be zero, but the register
390 * field for size doesn't have a zero option. */
391 if (reserved_base == 0) {
392 reserved_size = 0;
393 reserved_base = stolen_top;
394 }
395
396 dev_priv->dsm_reserved =
397 (struct resource) DEFINE_RES_MEM(reserved_base, reserved_size);
398
399 if (!resource_contains(&dev_priv->dsm, &dev_priv->dsm_reserved)) {
400 DRM_ERROR("Stolen reserved area %pR outside stolen memory %pR\n",
401 &dev_priv->dsm_reserved, &dev_priv->dsm);
402 return 0;
403 }
404
405 /* It is possible for the reserved area to end before the end of stolen
406 * memory, so just consider the start. */
407 reserved_total = stolen_top - reserved_base;
408
409 DRM_DEBUG_KMS("Memory reserved for graphics device: %lluK, usable: %lluK\n",
410 (u64)resource_size(&dev_priv->dsm) >> 10,
411 ((u64)resource_size(&dev_priv->dsm) - reserved_total) >> 10);
412
413 stolen_usable_start = 0;
414 /* WaSkipStolenMemoryFirstPage:bdw+ */
415 if (INTEL_GEN(dev_priv) >= 8)
416 stolen_usable_start = 4096;
417
418 dev_priv->stolen_usable_size =
419 resource_size(&dev_priv->dsm) - reserved_total - stolen_usable_start;
420
421 /* Basic memrange allocator for stolen space. */
422 drm_mm_init(&dev_priv->mm.stolen, stolen_usable_start,
423 dev_priv->stolen_usable_size);
424
425 return 0;
426}
427
428static struct sg_table *
429i915_pages_create_for_stolen(struct drm_device *dev,
430 resource_size_t offset, resource_size_t size)
431{
432 struct drm_i915_private *dev_priv = to_i915(dev);
433 struct sg_table *st;
434 struct scatterlist *sg;
435
436 GEM_BUG_ON(range_overflows(offset, size, resource_size(&dev_priv->dsm)));
437
438 /* We hide that we have no struct page backing our stolen object
439 * by wrapping the contiguous physical allocation with a fake
440 * dma mapping in a single scatterlist.
441 */
442
443 st = kmalloc(sizeof(*st), GFP_KERNEL);
444 if (st == NULL)
445 return ERR_PTR(-ENOMEM);
446
447 if (sg_alloc_table(st, 1, GFP_KERNEL)) {
448 kfree(st);
449 return ERR_PTR(-ENOMEM);
450 }
451
452 sg = st->sgl;
453 sg->offset = 0;
454 sg->length = size;
455
456 sg_dma_address(sg) = (dma_addr_t)dev_priv->dsm.start + offset;
457 sg_dma_len(sg) = size;
458
459 return st;
460}
461
462static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
463{
464 struct sg_table *pages =
465 i915_pages_create_for_stolen(obj->base.dev,
466 obj->stolen->start,
467 obj->stolen->size);
468 if (IS_ERR(pages))
469 return PTR_ERR(pages);
470
471 __i915_gem_object_set_pages(obj, pages, obj->stolen->size);
472
473 return 0;
474}
475
476static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj,
477 struct sg_table *pages)
478{
479 /* Should only be called from i915_gem_object_release_stolen() */
480 sg_free_table(pages);
481 kfree(pages);
482}
483
484static void
485i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
486{
487 struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
488 struct drm_mm_node *stolen = fetch_and_zero(&obj->stolen);
489
490 GEM_BUG_ON(!stolen);
491
492 __i915_gem_object_unpin_pages(obj);
493
494 i915_gem_stolen_remove_node(dev_priv, stolen);
495 kfree(stolen);
496}
497
498static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
499 .get_pages = i915_gem_object_get_pages_stolen,
500 .put_pages = i915_gem_object_put_pages_stolen,
501 .release = i915_gem_object_release_stolen,
502};
503
504static struct drm_i915_gem_object *
505_i915_gem_object_create_stolen(struct drm_i915_private *dev_priv,
506 struct drm_mm_node *stolen)
507{
508 struct drm_i915_gem_object *obj;
509 unsigned int cache_level;
510
511 obj = i915_gem_object_alloc(dev_priv);
512 if (obj == NULL)
513 return NULL;
514
515 drm_gem_private_object_init(&dev_priv->drm, &obj->base, stolen->size);
516 i915_gem_object_init(obj, &i915_gem_object_stolen_ops);
517
518 obj->stolen = stolen;
519 obj->read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT;
520 cache_level = HAS_LLC(dev_priv) ? I915_CACHE_LLC : I915_CACHE_NONE;
521 i915_gem_object_set_cache_coherency(obj, cache_level);
522
523 if (i915_gem_object_pin_pages(obj))
524 goto cleanup;
525
526 return obj;
527
528cleanup:
529 i915_gem_object_free(obj);
530 return NULL;
531}
532
533struct drm_i915_gem_object *
534i915_gem_object_create_stolen(struct drm_i915_private *dev_priv,
535 resource_size_t size)
536{
537 struct drm_i915_gem_object *obj;
538 struct drm_mm_node *stolen;
539 int ret;
540
541 if (!drm_mm_initialized(&dev_priv->mm.stolen))
542 return NULL;
543
544 if (size == 0)
545 return NULL;
546
547 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
548 if (!stolen)
549 return NULL;
550
551 ret = i915_gem_stolen_insert_node(dev_priv, stolen, size, 4096);
552 if (ret) {
553 kfree(stolen);
554 return NULL;
555 }
556
557 obj = _i915_gem_object_create_stolen(dev_priv, stolen);
558 if (obj)
559 return obj;
560
561 i915_gem_stolen_remove_node(dev_priv, stolen);
562 kfree(stolen);
563 return NULL;
564}
565
566struct drm_i915_gem_object *
567i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private *dev_priv,
568 resource_size_t stolen_offset,
569 resource_size_t gtt_offset,
570 resource_size_t size)
571{
572 struct i915_ggtt *ggtt = &dev_priv->ggtt;
573 struct drm_i915_gem_object *obj;
574 struct drm_mm_node *stolen;
575 struct i915_vma *vma;
576 int ret;
577
578 if (!drm_mm_initialized(&dev_priv->mm.stolen))
579 return NULL;
580
581 lockdep_assert_held(&dev_priv->drm.struct_mutex);
582
583 DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%pa, gtt_offset=%pa, size=%pa\n",
584 &stolen_offset, >t_offset, &size);
585
586 /* KISS and expect everything to be page-aligned */
587 if (WARN_ON(size == 0) ||
588 WARN_ON(!IS_ALIGNED(size, I915_GTT_PAGE_SIZE)) ||
589 WARN_ON(!IS_ALIGNED(stolen_offset, I915_GTT_MIN_ALIGNMENT)))
590 return NULL;
591
592 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
593 if (!stolen)
594 return NULL;
595
596 stolen->start = stolen_offset;
597 stolen->size = size;
598 mutex_lock(&dev_priv->mm.stolen_lock);
599 ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen);
600 mutex_unlock(&dev_priv->mm.stolen_lock);
601 if (ret) {
602 DRM_DEBUG_KMS("failed to allocate stolen space\n");
603 kfree(stolen);
604 return NULL;
605 }
606
607 obj = _i915_gem_object_create_stolen(dev_priv, stolen);
608 if (obj == NULL) {
609 DRM_DEBUG_KMS("failed to allocate stolen object\n");
610 i915_gem_stolen_remove_node(dev_priv, stolen);
611 kfree(stolen);
612 return NULL;
613 }
614
615 /* Some objects just need physical mem from stolen space */
616 if (gtt_offset == I915_GTT_OFFSET_NONE)
617 return obj;
618
619 ret = i915_gem_object_pin_pages(obj);
620 if (ret)
621 goto err;
622
623 vma = i915_vma_instance(obj, &ggtt->base, NULL);
624 if (IS_ERR(vma)) {
625 ret = PTR_ERR(vma);
626 goto err_pages;
627 }
628
629 /* To simplify the initialisation sequence between KMS and GTT,
630 * we allow construction of the stolen object prior to
631 * setting up the GTT space. The actual reservation will occur
632 * later.
633 */
634 ret = i915_gem_gtt_reserve(&ggtt->base, &vma->node,
635 size, gtt_offset, obj->cache_level,
636 0);
637 if (ret) {
638 DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
639 goto err_pages;
640 }
641
642 GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
643
644 vma->pages = obj->mm.pages;
645 vma->flags |= I915_VMA_GLOBAL_BIND;
646 __i915_vma_set_map_and_fenceable(vma);
647 list_move_tail(&vma->vm_link, &ggtt->base.inactive_list);
648
649 spin_lock(&dev_priv->mm.obj_lock);
650 list_move_tail(&obj->mm.link, &dev_priv->mm.bound_list);
651 obj->bind_count++;
652 spin_unlock(&dev_priv->mm.obj_lock);
653
654 return obj;
655
656err_pages:
657 i915_gem_object_unpin_pages(obj);
658err:
659 i915_gem_object_put(obj);
660 return NULL;
661}