Loading...
Note: File does not exist in v6.9.4.
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+ (incomplete)
59 */
60 if (start < 4096 && INTEL_GEN(dev_priv) >= 8)
61 start = 4096;
62
63 mutex_lock(&dev_priv->mm.stolen_lock);
64 ret = drm_mm_insert_node_in_range(&dev_priv->mm.stolen, node, size,
65 alignment, start, end,
66 DRM_MM_SEARCH_DEFAULT);
67 mutex_unlock(&dev_priv->mm.stolen_lock);
68
69 return ret;
70}
71
72int i915_gem_stolen_insert_node(struct drm_i915_private *dev_priv,
73 struct drm_mm_node *node, u64 size,
74 unsigned alignment)
75{
76 struct i915_ggtt *ggtt = &dev_priv->ggtt;
77
78 return i915_gem_stolen_insert_node_in_range(dev_priv, node, size,
79 alignment, 0,
80 ggtt->stolen_usable_size);
81}
82
83void i915_gem_stolen_remove_node(struct drm_i915_private *dev_priv,
84 struct drm_mm_node *node)
85{
86 mutex_lock(&dev_priv->mm.stolen_lock);
87 drm_mm_remove_node(node);
88 mutex_unlock(&dev_priv->mm.stolen_lock);
89}
90
91static unsigned long i915_stolen_to_physical(struct drm_i915_private *dev_priv)
92{
93 struct pci_dev *pdev = dev_priv->drm.pdev;
94 struct i915_ggtt *ggtt = &dev_priv->ggtt;
95 struct resource *r;
96 u32 base;
97
98 /* Almost universally we can find the Graphics Base of Stolen Memory
99 * at register BSM (0x5c) in the igfx configuration space. On a few
100 * (desktop) machines this is also mirrored in the bridge device at
101 * different locations, or in the MCHBAR.
102 *
103 * On 865 we just check the TOUD register.
104 *
105 * On 830/845/85x the stolen memory base isn't available in any
106 * register. We need to calculate it as TOM-TSEG_SIZE-stolen_size.
107 *
108 */
109 base = 0;
110 if (INTEL_GEN(dev_priv) >= 3) {
111 u32 bsm;
112
113 pci_read_config_dword(pdev, INTEL_BSM, &bsm);
114
115 base = bsm & INTEL_BSM_MASK;
116 } else if (IS_I865G(dev_priv)) {
117 u32 tseg_size = 0;
118 u16 toud = 0;
119 u8 tmp;
120
121 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
122 I845_ESMRAMC, &tmp);
123
124 if (tmp & TSEG_ENABLE) {
125 switch (tmp & I845_TSEG_SIZE_MASK) {
126 case I845_TSEG_SIZE_512K:
127 tseg_size = KB(512);
128 break;
129 case I845_TSEG_SIZE_1M:
130 tseg_size = MB(1);
131 break;
132 }
133 }
134
135 pci_bus_read_config_word(pdev->bus, PCI_DEVFN(0, 0),
136 I865_TOUD, &toud);
137
138 base = (toud << 16) + tseg_size;
139 } else if (IS_I85X(dev_priv)) {
140 u32 tseg_size = 0;
141 u32 tom;
142 u8 tmp;
143
144 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
145 I85X_ESMRAMC, &tmp);
146
147 if (tmp & TSEG_ENABLE)
148 tseg_size = MB(1);
149
150 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 1),
151 I85X_DRB3, &tmp);
152 tom = tmp * MB(32);
153
154 base = tom - tseg_size - ggtt->stolen_size;
155 } else if (IS_845G(dev_priv)) {
156 u32 tseg_size = 0;
157 u32 tom;
158 u8 tmp;
159
160 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
161 I845_ESMRAMC, &tmp);
162
163 if (tmp & TSEG_ENABLE) {
164 switch (tmp & I845_TSEG_SIZE_MASK) {
165 case I845_TSEG_SIZE_512K:
166 tseg_size = KB(512);
167 break;
168 case I845_TSEG_SIZE_1M:
169 tseg_size = MB(1);
170 break;
171 }
172 }
173
174 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
175 I830_DRB3, &tmp);
176 tom = tmp * MB(32);
177
178 base = tom - tseg_size - ggtt->stolen_size;
179 } else if (IS_I830(dev_priv)) {
180 u32 tseg_size = 0;
181 u32 tom;
182 u8 tmp;
183
184 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
185 I830_ESMRAMC, &tmp);
186
187 if (tmp & TSEG_ENABLE) {
188 if (tmp & I830_TSEG_SIZE_1M)
189 tseg_size = MB(1);
190 else
191 tseg_size = KB(512);
192 }
193
194 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
195 I830_DRB3, &tmp);
196 tom = tmp * MB(32);
197
198 base = tom - tseg_size - ggtt->stolen_size;
199 }
200
201 if (base == 0)
202 return 0;
203
204 /* make sure we don't clobber the GTT if it's within stolen memory */
205 if (INTEL_GEN(dev_priv) <= 4 && !IS_G33(dev_priv) &&
206 !IS_G4X(dev_priv)) {
207 struct {
208 u32 start, end;
209 } stolen[2] = {
210 { .start = base, .end = base + ggtt->stolen_size, },
211 { .start = base, .end = base + ggtt->stolen_size, },
212 };
213 u64 ggtt_start, ggtt_end;
214
215 ggtt_start = I915_READ(PGTBL_CTL);
216 if (IS_GEN4(dev_priv))
217 ggtt_start = (ggtt_start & PGTBL_ADDRESS_LO_MASK) |
218 (ggtt_start & PGTBL_ADDRESS_HI_MASK) << 28;
219 else
220 ggtt_start &= PGTBL_ADDRESS_LO_MASK;
221 ggtt_end = ggtt_start + ggtt_total_entries(ggtt) * 4;
222
223 if (ggtt_start >= stolen[0].start && ggtt_start < stolen[0].end)
224 stolen[0].end = ggtt_start;
225 if (ggtt_end > stolen[1].start && ggtt_end <= stolen[1].end)
226 stolen[1].start = ggtt_end;
227
228 /* pick the larger of the two chunks */
229 if (stolen[0].end - stolen[0].start >
230 stolen[1].end - stolen[1].start) {
231 base = stolen[0].start;
232 ggtt->stolen_size = stolen[0].end - stolen[0].start;
233 } else {
234 base = stolen[1].start;
235 ggtt->stolen_size = stolen[1].end - stolen[1].start;
236 }
237
238 if (stolen[0].start != stolen[1].start ||
239 stolen[0].end != stolen[1].end) {
240 DRM_DEBUG_KMS("GTT within stolen memory at 0x%llx-0x%llx\n",
241 (unsigned long long)ggtt_start,
242 (unsigned long long)ggtt_end - 1);
243 DRM_DEBUG_KMS("Stolen memory adjusted to 0x%x-0x%x\n",
244 base, base + (u32)ggtt->stolen_size - 1);
245 }
246 }
247
248
249 /* Verify that nothing else uses this physical address. Stolen
250 * memory should be reserved by the BIOS and hidden from the
251 * kernel. So if the region is already marked as busy, something
252 * is seriously wrong.
253 */
254 r = devm_request_mem_region(dev_priv->drm.dev, base, ggtt->stolen_size,
255 "Graphics Stolen Memory");
256 if (r == NULL) {
257 /*
258 * One more attempt but this time requesting region from
259 * base + 1, as we have seen that this resolves the region
260 * conflict with the PCI Bus.
261 * This is a BIOS w/a: Some BIOS wrap stolen in the root
262 * PCI bus, but have an off-by-one error. Hence retry the
263 * reservation starting from 1 instead of 0.
264 */
265 r = devm_request_mem_region(dev_priv->drm.dev, base + 1,
266 ggtt->stolen_size - 1,
267 "Graphics Stolen Memory");
268 /*
269 * GEN3 firmware likes to smash pci bridges into the stolen
270 * range. Apparently this works.
271 */
272 if (r == NULL && !IS_GEN3(dev_priv)) {
273 DRM_ERROR("conflict detected with stolen region: [0x%08x - 0x%08x]\n",
274 base, base + (uint32_t)ggtt->stolen_size);
275 base = 0;
276 }
277 }
278
279 return base;
280}
281
282void i915_gem_cleanup_stolen(struct drm_device *dev)
283{
284 struct drm_i915_private *dev_priv = to_i915(dev);
285
286 if (!drm_mm_initialized(&dev_priv->mm.stolen))
287 return;
288
289 drm_mm_takedown(&dev_priv->mm.stolen);
290}
291
292static void g4x_get_stolen_reserved(struct drm_i915_private *dev_priv,
293 unsigned long *base, unsigned long *size)
294{
295 struct i915_ggtt *ggtt = &dev_priv->ggtt;
296 uint32_t reg_val = I915_READ(IS_GM45(dev_priv) ?
297 CTG_STOLEN_RESERVED :
298 ELK_STOLEN_RESERVED);
299 unsigned long stolen_top = dev_priv->mm.stolen_base +
300 ggtt->stolen_size;
301
302 *base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16;
303
304 WARN_ON((reg_val & G4X_STOLEN_RESERVED_ADDR1_MASK) < *base);
305
306 /* On these platforms, the register doesn't have a size field, so the
307 * size is the distance between the base and the top of the stolen
308 * memory. We also have the genuine case where base is zero and there's
309 * nothing reserved. */
310 if (*base == 0)
311 *size = 0;
312 else
313 *size = stolen_top - *base;
314}
315
316static void gen6_get_stolen_reserved(struct drm_i915_private *dev_priv,
317 unsigned long *base, unsigned long *size)
318{
319 uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
320
321 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
322
323 switch (reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK) {
324 case GEN6_STOLEN_RESERVED_1M:
325 *size = 1024 * 1024;
326 break;
327 case GEN6_STOLEN_RESERVED_512K:
328 *size = 512 * 1024;
329 break;
330 case GEN6_STOLEN_RESERVED_256K:
331 *size = 256 * 1024;
332 break;
333 case GEN6_STOLEN_RESERVED_128K:
334 *size = 128 * 1024;
335 break;
336 default:
337 *size = 1024 * 1024;
338 MISSING_CASE(reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK);
339 }
340}
341
342static void gen7_get_stolen_reserved(struct drm_i915_private *dev_priv,
343 unsigned long *base, unsigned long *size)
344{
345 uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
346
347 *base = reg_val & GEN7_STOLEN_RESERVED_ADDR_MASK;
348
349 switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) {
350 case GEN7_STOLEN_RESERVED_1M:
351 *size = 1024 * 1024;
352 break;
353 case GEN7_STOLEN_RESERVED_256K:
354 *size = 256 * 1024;
355 break;
356 default:
357 *size = 1024 * 1024;
358 MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK);
359 }
360}
361
362static void gen8_get_stolen_reserved(struct drm_i915_private *dev_priv,
363 unsigned long *base, unsigned long *size)
364{
365 uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
366
367 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
368
369 switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) {
370 case GEN8_STOLEN_RESERVED_1M:
371 *size = 1024 * 1024;
372 break;
373 case GEN8_STOLEN_RESERVED_2M:
374 *size = 2 * 1024 * 1024;
375 break;
376 case GEN8_STOLEN_RESERVED_4M:
377 *size = 4 * 1024 * 1024;
378 break;
379 case GEN8_STOLEN_RESERVED_8M:
380 *size = 8 * 1024 * 1024;
381 break;
382 default:
383 *size = 8 * 1024 * 1024;
384 MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK);
385 }
386}
387
388static void bdw_get_stolen_reserved(struct drm_i915_private *dev_priv,
389 unsigned long *base, unsigned long *size)
390{
391 struct i915_ggtt *ggtt = &dev_priv->ggtt;
392 uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
393 unsigned long stolen_top;
394
395 stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size;
396
397 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
398
399 /* On these platforms, the register doesn't have a size field, so the
400 * size is the distance between the base and the top of the stolen
401 * memory. We also have the genuine case where base is zero and there's
402 * nothing reserved. */
403 if (*base == 0)
404 *size = 0;
405 else
406 *size = stolen_top - *base;
407}
408
409int i915_gem_init_stolen(struct drm_i915_private *dev_priv)
410{
411 struct i915_ggtt *ggtt = &dev_priv->ggtt;
412 unsigned long reserved_total, reserved_base = 0, reserved_size;
413 unsigned long stolen_top;
414
415 mutex_init(&dev_priv->mm.stolen_lock);
416
417 if (intel_vgpu_active(dev_priv)) {
418 DRM_INFO("iGVT-g active, disabling use of stolen memory\n");
419 return 0;
420 }
421
422#ifdef CONFIG_INTEL_IOMMU
423 if (intel_iommu_gfx_mapped && INTEL_GEN(dev_priv) < 8) {
424 DRM_INFO("DMAR active, disabling use of stolen memory\n");
425 return 0;
426 }
427#endif
428
429 if (ggtt->stolen_size == 0)
430 return 0;
431
432 dev_priv->mm.stolen_base = i915_stolen_to_physical(dev_priv);
433 if (dev_priv->mm.stolen_base == 0)
434 return 0;
435
436 stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size;
437
438 switch (INTEL_INFO(dev_priv)->gen) {
439 case 2:
440 case 3:
441 break;
442 case 4:
443 if (IS_G4X(dev_priv))
444 g4x_get_stolen_reserved(dev_priv, &reserved_base,
445 &reserved_size);
446 break;
447 case 5:
448 /* Assume the gen6 maximum for the older platforms. */
449 reserved_size = 1024 * 1024;
450 reserved_base = stolen_top - reserved_size;
451 break;
452 case 6:
453 gen6_get_stolen_reserved(dev_priv, &reserved_base,
454 &reserved_size);
455 break;
456 case 7:
457 gen7_get_stolen_reserved(dev_priv, &reserved_base,
458 &reserved_size);
459 break;
460 default:
461 if (IS_BROADWELL(dev_priv) ||
462 IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev_priv))
463 bdw_get_stolen_reserved(dev_priv, &reserved_base,
464 &reserved_size);
465 else
466 gen8_get_stolen_reserved(dev_priv, &reserved_base,
467 &reserved_size);
468 break;
469 }
470
471 /* It is possible for the reserved base to be zero, but the register
472 * field for size doesn't have a zero option. */
473 if (reserved_base == 0) {
474 reserved_size = 0;
475 reserved_base = stolen_top;
476 }
477
478 if (reserved_base < dev_priv->mm.stolen_base ||
479 reserved_base + reserved_size > stolen_top) {
480 DRM_DEBUG_KMS("Stolen reserved area [0x%08lx - 0x%08lx] outside stolen memory [0x%08lx - 0x%08lx]\n",
481 reserved_base, reserved_base + reserved_size,
482 dev_priv->mm.stolen_base, stolen_top);
483 return 0;
484 }
485
486 ggtt->stolen_reserved_base = reserved_base;
487 ggtt->stolen_reserved_size = reserved_size;
488
489 /* It is possible for the reserved area to end before the end of stolen
490 * memory, so just consider the start. */
491 reserved_total = stolen_top - reserved_base;
492
493 DRM_DEBUG_KMS("Memory reserved for graphics device: %zuK, usable: %luK\n",
494 ggtt->stolen_size >> 10,
495 (ggtt->stolen_size - reserved_total) >> 10);
496
497 ggtt->stolen_usable_size = ggtt->stolen_size - reserved_total;
498
499 /*
500 * Basic memrange allocator for stolen space.
501 *
502 * TODO: Notice that some platforms require us to not use the first page
503 * of the stolen memory but their BIOSes may still put the framebuffer
504 * on the first page. So we don't reserve this page for now because of
505 * that. Our current solution is to just prevent new nodes from being
506 * inserted on the first page - see the check we have at
507 * i915_gem_stolen_insert_node_in_range(). We may want to fix the fbcon
508 * problem later.
509 */
510 drm_mm_init(&dev_priv->mm.stolen, 0, ggtt->stolen_usable_size);
511
512 return 0;
513}
514
515static struct sg_table *
516i915_pages_create_for_stolen(struct drm_device *dev,
517 u32 offset, u32 size)
518{
519 struct drm_i915_private *dev_priv = to_i915(dev);
520 struct sg_table *st;
521 struct scatterlist *sg;
522
523 GEM_BUG_ON(offset > dev_priv->ggtt.stolen_size - size);
524
525 /* We hide that we have no struct page backing our stolen object
526 * by wrapping the contiguous physical allocation with a fake
527 * dma mapping in a single scatterlist.
528 */
529
530 st = kmalloc(sizeof(*st), GFP_KERNEL);
531 if (st == NULL)
532 return ERR_PTR(-ENOMEM);
533
534 if (sg_alloc_table(st, 1, GFP_KERNEL)) {
535 kfree(st);
536 return ERR_PTR(-ENOMEM);
537 }
538
539 sg = st->sgl;
540 sg->offset = 0;
541 sg->length = size;
542
543 sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset;
544 sg_dma_len(sg) = size;
545
546 return st;
547}
548
549static struct sg_table *
550i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
551{
552 return i915_pages_create_for_stolen(obj->base.dev,
553 obj->stolen->start,
554 obj->stolen->size);
555}
556
557static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj,
558 struct sg_table *pages)
559{
560 /* Should only be called from i915_gem_object_release_stolen() */
561 sg_free_table(pages);
562 kfree(pages);
563}
564
565static void
566i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
567{
568 struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
569 struct drm_mm_node *stolen = fetch_and_zero(&obj->stolen);
570
571 GEM_BUG_ON(!stolen);
572
573 __i915_gem_object_unpin_pages(obj);
574
575 i915_gem_stolen_remove_node(dev_priv, stolen);
576 kfree(stolen);
577}
578
579static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
580 .get_pages = i915_gem_object_get_pages_stolen,
581 .put_pages = i915_gem_object_put_pages_stolen,
582 .release = i915_gem_object_release_stolen,
583};
584
585static struct drm_i915_gem_object *
586_i915_gem_object_create_stolen(struct drm_device *dev,
587 struct drm_mm_node *stolen)
588{
589 struct drm_i915_gem_object *obj;
590
591 obj = i915_gem_object_alloc(dev);
592 if (obj == NULL)
593 return NULL;
594
595 drm_gem_private_object_init(dev, &obj->base, stolen->size);
596 i915_gem_object_init(obj, &i915_gem_object_stolen_ops);
597
598 obj->stolen = stolen;
599 obj->base.read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT;
600 obj->cache_level = HAS_LLC(to_i915(dev)) ?
601 I915_CACHE_LLC : I915_CACHE_NONE;
602
603 if (i915_gem_object_pin_pages(obj))
604 goto cleanup;
605
606 return obj;
607
608cleanup:
609 i915_gem_object_free(obj);
610 return NULL;
611}
612
613struct drm_i915_gem_object *
614i915_gem_object_create_stolen(struct drm_device *dev, u32 size)
615{
616 struct drm_i915_private *dev_priv = to_i915(dev);
617 struct drm_i915_gem_object *obj;
618 struct drm_mm_node *stolen;
619 int ret;
620
621 if (!drm_mm_initialized(&dev_priv->mm.stolen))
622 return NULL;
623
624 if (size == 0)
625 return NULL;
626
627 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
628 if (!stolen)
629 return NULL;
630
631 ret = i915_gem_stolen_insert_node(dev_priv, stolen, size, 4096);
632 if (ret) {
633 kfree(stolen);
634 return NULL;
635 }
636
637 obj = _i915_gem_object_create_stolen(dev, stolen);
638 if (obj)
639 return obj;
640
641 i915_gem_stolen_remove_node(dev_priv, stolen);
642 kfree(stolen);
643 return NULL;
644}
645
646struct drm_i915_gem_object *
647i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
648 u32 stolen_offset,
649 u32 gtt_offset,
650 u32 size)
651{
652 struct drm_i915_private *dev_priv = to_i915(dev);
653 struct i915_ggtt *ggtt = &dev_priv->ggtt;
654 struct drm_i915_gem_object *obj;
655 struct drm_mm_node *stolen;
656 struct i915_vma *vma;
657 int ret;
658
659 if (!drm_mm_initialized(&dev_priv->mm.stolen))
660 return NULL;
661
662 lockdep_assert_held(&dev->struct_mutex);
663
664 DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n",
665 stolen_offset, gtt_offset, size);
666
667 /* KISS and expect everything to be page-aligned */
668 if (WARN_ON(size == 0) || WARN_ON(size & 4095) ||
669 WARN_ON(stolen_offset & 4095))
670 return NULL;
671
672 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
673 if (!stolen)
674 return NULL;
675
676 stolen->start = stolen_offset;
677 stolen->size = size;
678 mutex_lock(&dev_priv->mm.stolen_lock);
679 ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen);
680 mutex_unlock(&dev_priv->mm.stolen_lock);
681 if (ret) {
682 DRM_DEBUG_KMS("failed to allocate stolen space\n");
683 kfree(stolen);
684 return NULL;
685 }
686
687 obj = _i915_gem_object_create_stolen(dev, stolen);
688 if (obj == NULL) {
689 DRM_DEBUG_KMS("failed to allocate stolen object\n");
690 i915_gem_stolen_remove_node(dev_priv, stolen);
691 kfree(stolen);
692 return NULL;
693 }
694
695 /* Some objects just need physical mem from stolen space */
696 if (gtt_offset == I915_GTT_OFFSET_NONE)
697 return obj;
698
699 ret = i915_gem_object_pin_pages(obj);
700 if (ret)
701 goto err;
702
703 vma = i915_gem_obj_lookup_or_create_vma(obj, &ggtt->base, NULL);
704 if (IS_ERR(vma)) {
705 ret = PTR_ERR(vma);
706 goto err_pages;
707 }
708
709 /* To simplify the initialisation sequence between KMS and GTT,
710 * we allow construction of the stolen object prior to
711 * setting up the GTT space. The actual reservation will occur
712 * later.
713 */
714 vma->node.start = gtt_offset;
715 vma->node.size = size;
716
717 ret = drm_mm_reserve_node(&ggtt->base.mm, &vma->node);
718 if (ret) {
719 DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
720 goto err_pages;
721 }
722
723 vma->pages = obj->mm.pages;
724 vma->flags |= I915_VMA_GLOBAL_BIND;
725 __i915_vma_set_map_and_fenceable(vma);
726 list_move_tail(&vma->vm_link, &ggtt->base.inactive_list);
727 list_move_tail(&obj->global_link, &dev_priv->mm.bound_list);
728 obj->bind_count++;
729
730 return obj;
731
732err_pages:
733 i915_gem_object_unpin_pages(obj);
734err:
735 i915_gem_object_put(obj);
736 return NULL;
737}