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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#define KB(x) ((x) * 1024)
34#define MB(x) (KB(x) * 1024)
35
36/*
37 * The BIOS typically reserves some of the system's memory for the exclusive
38 * use of the integrated graphics. This memory is no longer available for
39 * use by the OS and so the user finds that his system has less memory
40 * available than he put in. We refer to this memory as stolen.
41 *
42 * The BIOS will allocate its framebuffer from the stolen memory. Our
43 * goal is try to reuse that object for our own fbcon which must always
44 * be available for panics. Anything else we can reuse the stolen memory
45 * for is a boon.
46 */
47
48int i915_gem_stolen_insert_node_in_range(struct drm_i915_private *dev_priv,
49 struct drm_mm_node *node, u64 size,
50 unsigned alignment, u64 start, u64 end)
51{
52 int ret;
53
54 if (!drm_mm_initialized(&dev_priv->mm.stolen))
55 return -ENODEV;
56
57 /* See the comment at the drm_mm_init() call for more about this check.
58 * WaSkipStolenMemoryFirstPage:bdw,chv (incomplete) */
59 if (INTEL_INFO(dev_priv)->gen == 8 && start < 4096)
60 start = 4096;
61
62 mutex_lock(&dev_priv->mm.stolen_lock);
63 ret = drm_mm_insert_node_in_range(&dev_priv->mm.stolen, node, size,
64 alignment, start, end,
65 DRM_MM_SEARCH_DEFAULT);
66 mutex_unlock(&dev_priv->mm.stolen_lock);
67
68 return ret;
69}
70
71int i915_gem_stolen_insert_node(struct drm_i915_private *dev_priv,
72 struct drm_mm_node *node, u64 size,
73 unsigned alignment)
74{
75 return i915_gem_stolen_insert_node_in_range(dev_priv, node, size,
76 alignment, 0,
77 dev_priv->gtt.stolen_usable_size);
78}
79
80void i915_gem_stolen_remove_node(struct drm_i915_private *dev_priv,
81 struct drm_mm_node *node)
82{
83 mutex_lock(&dev_priv->mm.stolen_lock);
84 drm_mm_remove_node(node);
85 mutex_unlock(&dev_priv->mm.stolen_lock);
86}
87
88static unsigned long i915_stolen_to_physical(struct drm_device *dev)
89{
90 struct drm_i915_private *dev_priv = dev->dev_private;
91 struct resource *r;
92 u32 base;
93
94 /* Almost universally we can find the Graphics Base of Stolen Memory
95 * at offset 0x5c in the igfx configuration space. On a few (desktop)
96 * machines this is also mirrored in the bridge device at different
97 * locations, or in the MCHBAR.
98 *
99 * On 865 we just check the TOUD register.
100 *
101 * On 830/845/85x the stolen memory base isn't available in any
102 * register. We need to calculate it as TOM-TSEG_SIZE-stolen_size.
103 *
104 */
105 base = 0;
106 if (INTEL_INFO(dev)->gen >= 3) {
107 /* Read Graphics Base of Stolen Memory directly */
108 pci_read_config_dword(dev->pdev, 0x5c, &base);
109 base &= ~((1<<20) - 1);
110 } else if (IS_I865G(dev)) {
111 u16 toud = 0;
112
113 /*
114 * FIXME is the graphics stolen memory region
115 * always at TOUD? Ie. is it always the last
116 * one to be allocated by the BIOS?
117 */
118 pci_bus_read_config_word(dev->pdev->bus, PCI_DEVFN(0, 0),
119 I865_TOUD, &toud);
120
121 base = toud << 16;
122 } else if (IS_I85X(dev)) {
123 u32 tseg_size = 0;
124 u32 tom;
125 u8 tmp;
126
127 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
128 I85X_ESMRAMC, &tmp);
129
130 if (tmp & TSEG_ENABLE)
131 tseg_size = MB(1);
132
133 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 1),
134 I85X_DRB3, &tmp);
135 tom = tmp * MB(32);
136
137 base = tom - tseg_size - dev_priv->gtt.stolen_size;
138 } else if (IS_845G(dev)) {
139 u32 tseg_size = 0;
140 u32 tom;
141 u8 tmp;
142
143 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
144 I845_ESMRAMC, &tmp);
145
146 if (tmp & TSEG_ENABLE) {
147 switch (tmp & I845_TSEG_SIZE_MASK) {
148 case I845_TSEG_SIZE_512K:
149 tseg_size = KB(512);
150 break;
151 case I845_TSEG_SIZE_1M:
152 tseg_size = MB(1);
153 break;
154 }
155 }
156
157 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
158 I830_DRB3, &tmp);
159 tom = tmp * MB(32);
160
161 base = tom - tseg_size - dev_priv->gtt.stolen_size;
162 } else if (IS_I830(dev)) {
163 u32 tseg_size = 0;
164 u32 tom;
165 u8 tmp;
166
167 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
168 I830_ESMRAMC, &tmp);
169
170 if (tmp & TSEG_ENABLE) {
171 if (tmp & I830_TSEG_SIZE_1M)
172 tseg_size = MB(1);
173 else
174 tseg_size = KB(512);
175 }
176
177 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
178 I830_DRB3, &tmp);
179 tom = tmp * MB(32);
180
181 base = tom - tseg_size - dev_priv->gtt.stolen_size;
182 }
183
184 if (base == 0)
185 return 0;
186
187 /* make sure we don't clobber the GTT if it's within stolen memory */
188 if (INTEL_INFO(dev)->gen <= 4 && !IS_G33(dev) && !IS_G4X(dev)) {
189 struct {
190 u32 start, end;
191 } stolen[2] = {
192 { .start = base, .end = base + dev_priv->gtt.stolen_size, },
193 { .start = base, .end = base + dev_priv->gtt.stolen_size, },
194 };
195 u64 gtt_start, gtt_end;
196
197 gtt_start = I915_READ(PGTBL_CTL);
198 if (IS_GEN4(dev))
199 gtt_start = (gtt_start & PGTBL_ADDRESS_LO_MASK) |
200 (gtt_start & PGTBL_ADDRESS_HI_MASK) << 28;
201 else
202 gtt_start &= PGTBL_ADDRESS_LO_MASK;
203 gtt_end = gtt_start + gtt_total_entries(dev_priv->gtt) * 4;
204
205 if (gtt_start >= stolen[0].start && gtt_start < stolen[0].end)
206 stolen[0].end = gtt_start;
207 if (gtt_end > stolen[1].start && gtt_end <= stolen[1].end)
208 stolen[1].start = gtt_end;
209
210 /* pick the larger of the two chunks */
211 if (stolen[0].end - stolen[0].start >
212 stolen[1].end - stolen[1].start) {
213 base = stolen[0].start;
214 dev_priv->gtt.stolen_size = stolen[0].end - stolen[0].start;
215 } else {
216 base = stolen[1].start;
217 dev_priv->gtt.stolen_size = stolen[1].end - stolen[1].start;
218 }
219
220 if (stolen[0].start != stolen[1].start ||
221 stolen[0].end != stolen[1].end) {
222 DRM_DEBUG_KMS("GTT within stolen memory at 0x%llx-0x%llx\n",
223 (unsigned long long) gtt_start,
224 (unsigned long long) gtt_end - 1);
225 DRM_DEBUG_KMS("Stolen memory adjusted to 0x%x-0x%x\n",
226 base, base + (u32) dev_priv->gtt.stolen_size - 1);
227 }
228 }
229
230
231 /* Verify that nothing else uses this physical address. Stolen
232 * memory should be reserved by the BIOS and hidden from the
233 * kernel. So if the region is already marked as busy, something
234 * is seriously wrong.
235 */
236 r = devm_request_mem_region(dev->dev, base, dev_priv->gtt.stolen_size,
237 "Graphics Stolen Memory");
238 if (r == NULL) {
239 /*
240 * One more attempt but this time requesting region from
241 * base + 1, as we have seen that this resolves the region
242 * conflict with the PCI Bus.
243 * This is a BIOS w/a: Some BIOS wrap stolen in the root
244 * PCI bus, but have an off-by-one error. Hence retry the
245 * reservation starting from 1 instead of 0.
246 */
247 r = devm_request_mem_region(dev->dev, base + 1,
248 dev_priv->gtt.stolen_size - 1,
249 "Graphics Stolen Memory");
250 /*
251 * GEN3 firmware likes to smash pci bridges into the stolen
252 * range. Apparently this works.
253 */
254 if (r == NULL && !IS_GEN3(dev)) {
255 DRM_ERROR("conflict detected with stolen region: [0x%08x - 0x%08x]\n",
256 base, base + (uint32_t)dev_priv->gtt.stolen_size);
257 base = 0;
258 }
259 }
260
261 return base;
262}
263
264void i915_gem_cleanup_stolen(struct drm_device *dev)
265{
266 struct drm_i915_private *dev_priv = dev->dev_private;
267
268 if (!drm_mm_initialized(&dev_priv->mm.stolen))
269 return;
270
271 drm_mm_takedown(&dev_priv->mm.stolen);
272}
273
274static void g4x_get_stolen_reserved(struct drm_i915_private *dev_priv,
275 unsigned long *base, unsigned long *size)
276{
277 uint32_t reg_val = I915_READ(IS_GM45(dev_priv) ?
278 CTG_STOLEN_RESERVED :
279 ELK_STOLEN_RESERVED);
280 unsigned long stolen_top = dev_priv->mm.stolen_base +
281 dev_priv->gtt.stolen_size;
282
283 *base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16;
284
285 WARN_ON((reg_val & G4X_STOLEN_RESERVED_ADDR1_MASK) < *base);
286
287 /* On these platforms, the register doesn't have a size field, so the
288 * size is the distance between the base and the top of the stolen
289 * memory. We also have the genuine case where base is zero and there's
290 * nothing reserved. */
291 if (*base == 0)
292 *size = 0;
293 else
294 *size = stolen_top - *base;
295}
296
297static void gen6_get_stolen_reserved(struct drm_i915_private *dev_priv,
298 unsigned long *base, unsigned long *size)
299{
300 uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
301
302 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
303
304 switch (reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK) {
305 case GEN6_STOLEN_RESERVED_1M:
306 *size = 1024 * 1024;
307 break;
308 case GEN6_STOLEN_RESERVED_512K:
309 *size = 512 * 1024;
310 break;
311 case GEN6_STOLEN_RESERVED_256K:
312 *size = 256 * 1024;
313 break;
314 case GEN6_STOLEN_RESERVED_128K:
315 *size = 128 * 1024;
316 break;
317 default:
318 *size = 1024 * 1024;
319 MISSING_CASE(reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK);
320 }
321}
322
323static void gen7_get_stolen_reserved(struct drm_i915_private *dev_priv,
324 unsigned long *base, unsigned long *size)
325{
326 uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
327
328 *base = reg_val & GEN7_STOLEN_RESERVED_ADDR_MASK;
329
330 switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) {
331 case GEN7_STOLEN_RESERVED_1M:
332 *size = 1024 * 1024;
333 break;
334 case GEN7_STOLEN_RESERVED_256K:
335 *size = 256 * 1024;
336 break;
337 default:
338 *size = 1024 * 1024;
339 MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK);
340 }
341}
342
343static void gen8_get_stolen_reserved(struct drm_i915_private *dev_priv,
344 unsigned long *base, unsigned long *size)
345{
346 uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
347
348 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
349
350 switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) {
351 case GEN8_STOLEN_RESERVED_1M:
352 *size = 1024 * 1024;
353 break;
354 case GEN8_STOLEN_RESERVED_2M:
355 *size = 2 * 1024 * 1024;
356 break;
357 case GEN8_STOLEN_RESERVED_4M:
358 *size = 4 * 1024 * 1024;
359 break;
360 case GEN8_STOLEN_RESERVED_8M:
361 *size = 8 * 1024 * 1024;
362 break;
363 default:
364 *size = 8 * 1024 * 1024;
365 MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK);
366 }
367}
368
369static void bdw_get_stolen_reserved(struct drm_i915_private *dev_priv,
370 unsigned long *base, unsigned long *size)
371{
372 uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
373 unsigned long stolen_top;
374
375 stolen_top = dev_priv->mm.stolen_base + dev_priv->gtt.stolen_size;
376
377 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
378
379 /* On these platforms, the register doesn't have a size field, so the
380 * size is the distance between the base and the top of the stolen
381 * memory. We also have the genuine case where base is zero and there's
382 * nothing reserved. */
383 if (*base == 0)
384 *size = 0;
385 else
386 *size = stolen_top - *base;
387}
388
389int i915_gem_init_stolen(struct drm_device *dev)
390{
391 struct drm_i915_private *dev_priv = dev->dev_private;
392 unsigned long reserved_total, reserved_base = 0, reserved_size;
393 unsigned long stolen_top;
394
395 mutex_init(&dev_priv->mm.stolen_lock);
396
397#ifdef CONFIG_INTEL_IOMMU
398 if (intel_iommu_gfx_mapped && INTEL_INFO(dev)->gen < 8) {
399 DRM_INFO("DMAR active, disabling use of stolen memory\n");
400 return 0;
401 }
402#endif
403
404 if (dev_priv->gtt.stolen_size == 0)
405 return 0;
406
407 dev_priv->mm.stolen_base = i915_stolen_to_physical(dev);
408 if (dev_priv->mm.stolen_base == 0)
409 return 0;
410
411 stolen_top = dev_priv->mm.stolen_base + dev_priv->gtt.stolen_size;
412
413 switch (INTEL_INFO(dev_priv)->gen) {
414 case 2:
415 case 3:
416 break;
417 case 4:
418 if (IS_G4X(dev))
419 g4x_get_stolen_reserved(dev_priv, &reserved_base,
420 &reserved_size);
421 break;
422 case 5:
423 /* Assume the gen6 maximum for the older platforms. */
424 reserved_size = 1024 * 1024;
425 reserved_base = stolen_top - reserved_size;
426 break;
427 case 6:
428 gen6_get_stolen_reserved(dev_priv, &reserved_base,
429 &reserved_size);
430 break;
431 case 7:
432 gen7_get_stolen_reserved(dev_priv, &reserved_base,
433 &reserved_size);
434 break;
435 default:
436 if (IS_BROADWELL(dev_priv) ||
437 IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev))
438 bdw_get_stolen_reserved(dev_priv, &reserved_base,
439 &reserved_size);
440 else
441 gen8_get_stolen_reserved(dev_priv, &reserved_base,
442 &reserved_size);
443 break;
444 }
445
446 /* It is possible for the reserved base to be zero, but the register
447 * field for size doesn't have a zero option. */
448 if (reserved_base == 0) {
449 reserved_size = 0;
450 reserved_base = stolen_top;
451 }
452
453 if (reserved_base < dev_priv->mm.stolen_base ||
454 reserved_base + reserved_size > stolen_top) {
455 DRM_DEBUG_KMS("Stolen reserved area [0x%08lx - 0x%08lx] outside stolen memory [0x%08lx - 0x%08lx]\n",
456 reserved_base, reserved_base + reserved_size,
457 dev_priv->mm.stolen_base, stolen_top);
458 return 0;
459 }
460
461 dev_priv->gtt.stolen_reserved_base = reserved_base;
462 dev_priv->gtt.stolen_reserved_size = reserved_size;
463
464 /* It is possible for the reserved area to end before the end of stolen
465 * memory, so just consider the start. */
466 reserved_total = stolen_top - reserved_base;
467
468 DRM_DEBUG_KMS("Memory reserved for graphics device: %zuK, usable: %luK\n",
469 dev_priv->gtt.stolen_size >> 10,
470 (dev_priv->gtt.stolen_size - reserved_total) >> 10);
471
472 dev_priv->gtt.stolen_usable_size = dev_priv->gtt.stolen_size -
473 reserved_total;
474
475 /*
476 * Basic memrange allocator for stolen space.
477 *
478 * TODO: Notice that some platforms require us to not use the first page
479 * of the stolen memory but their BIOSes may still put the framebuffer
480 * on the first page. So we don't reserve this page for now because of
481 * that. Our current solution is to just prevent new nodes from being
482 * inserted on the first page - see the check we have at
483 * i915_gem_stolen_insert_node_in_range(). We may want to fix the fbcon
484 * problem later.
485 */
486 drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->gtt.stolen_usable_size);
487
488 return 0;
489}
490
491static struct sg_table *
492i915_pages_create_for_stolen(struct drm_device *dev,
493 u32 offset, u32 size)
494{
495 struct drm_i915_private *dev_priv = dev->dev_private;
496 struct sg_table *st;
497 struct scatterlist *sg;
498
499 DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size);
500 BUG_ON(offset > dev_priv->gtt.stolen_size - size);
501
502 /* We hide that we have no struct page backing our stolen object
503 * by wrapping the contiguous physical allocation with a fake
504 * dma mapping in a single scatterlist.
505 */
506
507 st = kmalloc(sizeof(*st), GFP_KERNEL);
508 if (st == NULL)
509 return NULL;
510
511 if (sg_alloc_table(st, 1, GFP_KERNEL)) {
512 kfree(st);
513 return NULL;
514 }
515
516 sg = st->sgl;
517 sg->offset = 0;
518 sg->length = size;
519
520 sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset;
521 sg_dma_len(sg) = size;
522
523 return st;
524}
525
526static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
527{
528 BUG();
529 return -EINVAL;
530}
531
532static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj)
533{
534 /* Should only be called during free */
535 sg_free_table(obj->pages);
536 kfree(obj->pages);
537}
538
539
540static void
541i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
542{
543 struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
544
545 if (obj->stolen) {
546 i915_gem_stolen_remove_node(dev_priv, obj->stolen);
547 kfree(obj->stolen);
548 obj->stolen = NULL;
549 }
550}
551static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
552 .get_pages = i915_gem_object_get_pages_stolen,
553 .put_pages = i915_gem_object_put_pages_stolen,
554 .release = i915_gem_object_release_stolen,
555};
556
557static struct drm_i915_gem_object *
558_i915_gem_object_create_stolen(struct drm_device *dev,
559 struct drm_mm_node *stolen)
560{
561 struct drm_i915_gem_object *obj;
562
563 obj = i915_gem_object_alloc(dev);
564 if (obj == NULL)
565 return NULL;
566
567 drm_gem_private_object_init(dev, &obj->base, stolen->size);
568 i915_gem_object_init(obj, &i915_gem_object_stolen_ops);
569
570 obj->pages = i915_pages_create_for_stolen(dev,
571 stolen->start, stolen->size);
572 if (obj->pages == NULL)
573 goto cleanup;
574
575 obj->get_page.sg = obj->pages->sgl;
576 obj->get_page.last = 0;
577
578 i915_gem_object_pin_pages(obj);
579 obj->stolen = stolen;
580
581 obj->base.read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT;
582 obj->cache_level = HAS_LLC(dev) ? I915_CACHE_LLC : I915_CACHE_NONE;
583
584 return obj;
585
586cleanup:
587 i915_gem_object_free(obj);
588 return NULL;
589}
590
591struct drm_i915_gem_object *
592i915_gem_object_create_stolen(struct drm_device *dev, u32 size)
593{
594 struct drm_i915_private *dev_priv = dev->dev_private;
595 struct drm_i915_gem_object *obj;
596 struct drm_mm_node *stolen;
597 int ret;
598
599 if (!drm_mm_initialized(&dev_priv->mm.stolen))
600 return NULL;
601
602 DRM_DEBUG_KMS("creating stolen object: size=%x\n", size);
603 if (size == 0)
604 return NULL;
605
606 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
607 if (!stolen)
608 return NULL;
609
610 ret = i915_gem_stolen_insert_node(dev_priv, stolen, size, 4096);
611 if (ret) {
612 kfree(stolen);
613 return NULL;
614 }
615
616 obj = _i915_gem_object_create_stolen(dev, stolen);
617 if (obj)
618 return obj;
619
620 i915_gem_stolen_remove_node(dev_priv, stolen);
621 kfree(stolen);
622 return NULL;
623}
624
625struct drm_i915_gem_object *
626i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
627 u32 stolen_offset,
628 u32 gtt_offset,
629 u32 size)
630{
631 struct drm_i915_private *dev_priv = dev->dev_private;
632 struct i915_address_space *ggtt = &dev_priv->gtt.base;
633 struct drm_i915_gem_object *obj;
634 struct drm_mm_node *stolen;
635 struct i915_vma *vma;
636 int ret;
637
638 if (!drm_mm_initialized(&dev_priv->mm.stolen))
639 return NULL;
640
641 lockdep_assert_held(&dev->struct_mutex);
642
643 DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n",
644 stolen_offset, gtt_offset, size);
645
646 /* KISS and expect everything to be page-aligned */
647 if (WARN_ON(size == 0) || WARN_ON(size & 4095) ||
648 WARN_ON(stolen_offset & 4095))
649 return NULL;
650
651 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
652 if (!stolen)
653 return NULL;
654
655 stolen->start = stolen_offset;
656 stolen->size = size;
657 mutex_lock(&dev_priv->mm.stolen_lock);
658 ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen);
659 mutex_unlock(&dev_priv->mm.stolen_lock);
660 if (ret) {
661 DRM_DEBUG_KMS("failed to allocate stolen space\n");
662 kfree(stolen);
663 return NULL;
664 }
665
666 obj = _i915_gem_object_create_stolen(dev, stolen);
667 if (obj == NULL) {
668 DRM_DEBUG_KMS("failed to allocate stolen object\n");
669 i915_gem_stolen_remove_node(dev_priv, stolen);
670 kfree(stolen);
671 return NULL;
672 }
673
674 /* Some objects just need physical mem from stolen space */
675 if (gtt_offset == I915_GTT_OFFSET_NONE)
676 return obj;
677
678 vma = i915_gem_obj_lookup_or_create_vma(obj, ggtt);
679 if (IS_ERR(vma)) {
680 ret = PTR_ERR(vma);
681 goto err;
682 }
683
684 /* To simplify the initialisation sequence between KMS and GTT,
685 * we allow construction of the stolen object prior to
686 * setting up the GTT space. The actual reservation will occur
687 * later.
688 */
689 vma->node.start = gtt_offset;
690 vma->node.size = size;
691 if (drm_mm_initialized(&ggtt->mm)) {
692 ret = drm_mm_reserve_node(&ggtt->mm, &vma->node);
693 if (ret) {
694 DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
695 goto err;
696 }
697
698 vma->bound |= GLOBAL_BIND;
699 __i915_vma_set_map_and_fenceable(vma);
700 list_add_tail(&vma->vm_link, &ggtt->inactive_list);
701 }
702
703 list_add_tail(&obj->global_list, &dev_priv->mm.bound_list);
704 i915_gem_object_pin_pages(obj);
705
706 return obj;
707
708err:
709 drm_gem_object_unreference(&obj->base);
710 return NULL;
711}