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
i915_gem_stolen_insert_node_in_range(struct drm_i915_private * dev_priv,struct drm_mm_node * node,u64 size,unsigned alignment,u64 start,u64 end)48 int 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
i915_gem_stolen_insert_node(struct drm_i915_private * dev_priv,struct drm_mm_node * node,u64 size,unsigned alignment)71 int 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
i915_gem_stolen_remove_node(struct drm_i915_private * dev_priv,struct drm_mm_node * node)80 void 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
i915_stolen_to_physical(struct drm_device * dev)88 static 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 u32 tseg_size = 0;
112 u16 toud = 0;
113 u8 tmp;
114
115 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
116 I845_ESMRAMC, &tmp);
117
118 if (tmp & TSEG_ENABLE) {
119 switch (tmp & I845_TSEG_SIZE_MASK) {
120 case I845_TSEG_SIZE_512K:
121 tseg_size = KB(512);
122 break;
123 case I845_TSEG_SIZE_1M:
124 tseg_size = MB(1);
125 break;
126 }
127 }
128
129 pci_bus_read_config_word(dev->pdev->bus, PCI_DEVFN(0, 0),
130 I865_TOUD, &toud);
131
132 base = (toud << 16) + tseg_size;
133 } else if (IS_I85X(dev)) {
134 u32 tseg_size = 0;
135 u32 tom;
136 u8 tmp;
137
138 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
139 I85X_ESMRAMC, &tmp);
140
141 if (tmp & TSEG_ENABLE)
142 tseg_size = MB(1);
143
144 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 1),
145 I85X_DRB3, &tmp);
146 tom = tmp * MB(32);
147
148 base = tom - tseg_size - dev_priv->gtt.stolen_size;
149 } else if (IS_845G(dev)) {
150 u32 tseg_size = 0;
151 u32 tom;
152 u8 tmp;
153
154 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
155 I845_ESMRAMC, &tmp);
156
157 if (tmp & TSEG_ENABLE) {
158 switch (tmp & I845_TSEG_SIZE_MASK) {
159 case I845_TSEG_SIZE_512K:
160 tseg_size = KB(512);
161 break;
162 case I845_TSEG_SIZE_1M:
163 tseg_size = MB(1);
164 break;
165 }
166 }
167
168 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
169 I830_DRB3, &tmp);
170 tom = tmp * MB(32);
171
172 base = tom - tseg_size - dev_priv->gtt.stolen_size;
173 } else if (IS_I830(dev)) {
174 u32 tseg_size = 0;
175 u32 tom;
176 u8 tmp;
177
178 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
179 I830_ESMRAMC, &tmp);
180
181 if (tmp & TSEG_ENABLE) {
182 if (tmp & I830_TSEG_SIZE_1M)
183 tseg_size = MB(1);
184 else
185 tseg_size = KB(512);
186 }
187
188 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
189 I830_DRB3, &tmp);
190 tom = tmp * MB(32);
191
192 base = tom - tseg_size - dev_priv->gtt.stolen_size;
193 }
194
195 if (base == 0)
196 return 0;
197
198 /* make sure we don't clobber the GTT if it's within stolen memory */
199 if (INTEL_INFO(dev)->gen <= 4 && !IS_G33(dev) && !IS_G4X(dev)) {
200 struct {
201 u32 start, end;
202 } stolen[2] = {
203 { .start = base, .end = base + dev_priv->gtt.stolen_size, },
204 { .start = base, .end = base + dev_priv->gtt.stolen_size, },
205 };
206 u64 gtt_start, gtt_end;
207
208 gtt_start = I915_READ(PGTBL_CTL);
209 if (IS_GEN4(dev))
210 gtt_start = (gtt_start & PGTBL_ADDRESS_LO_MASK) |
211 (gtt_start & PGTBL_ADDRESS_HI_MASK) << 28;
212 else
213 gtt_start &= PGTBL_ADDRESS_LO_MASK;
214 gtt_end = gtt_start + gtt_total_entries(dev_priv->gtt) * 4;
215
216 if (gtt_start >= stolen[0].start && gtt_start < stolen[0].end)
217 stolen[0].end = gtt_start;
218 if (gtt_end > stolen[1].start && gtt_end <= stolen[1].end)
219 stolen[1].start = gtt_end;
220
221 /* pick the larger of the two chunks */
222 if (stolen[0].end - stolen[0].start >
223 stolen[1].end - stolen[1].start) {
224 base = stolen[0].start;
225 dev_priv->gtt.stolen_size = stolen[0].end - stolen[0].start;
226 } else {
227 base = stolen[1].start;
228 dev_priv->gtt.stolen_size = stolen[1].end - stolen[1].start;
229 }
230
231 if (stolen[0].start != stolen[1].start ||
232 stolen[0].end != stolen[1].end) {
233 DRM_DEBUG_KMS("GTT within stolen memory at 0x%llx-0x%llx\n",
234 (unsigned long long) gtt_start,
235 (unsigned long long) gtt_end - 1);
236 DRM_DEBUG_KMS("Stolen memory adjusted to 0x%x-0x%x\n",
237 base, base + (u32) dev_priv->gtt.stolen_size - 1);
238 }
239 }
240
241
242 /* Verify that nothing else uses this physical address. Stolen
243 * memory should be reserved by the BIOS and hidden from the
244 * kernel. So if the region is already marked as busy, something
245 * is seriously wrong.
246 */
247 r = devm_request_mem_region(dev->dev, base, dev_priv->gtt.stolen_size,
248 "Graphics Stolen Memory");
249 if (r == NULL) {
250 /*
251 * One more attempt but this time requesting region from
252 * base + 1, as we have seen that this resolves the region
253 * conflict with the PCI Bus.
254 * This is a BIOS w/a: Some BIOS wrap stolen in the root
255 * PCI bus, but have an off-by-one error. Hence retry the
256 * reservation starting from 1 instead of 0.
257 */
258 r = devm_request_mem_region(dev->dev, base + 1,
259 dev_priv->gtt.stolen_size - 1,
260 "Graphics Stolen Memory");
261 /*
262 * GEN3 firmware likes to smash pci bridges into the stolen
263 * range. Apparently this works.
264 */
265 if (r == NULL && !IS_GEN3(dev)) {
266 DRM_ERROR("conflict detected with stolen region: [0x%08x - 0x%08x]\n",
267 base, base + (uint32_t)dev_priv->gtt.stolen_size);
268 base = 0;
269 }
270 }
271
272 return base;
273 }
274
i915_gem_cleanup_stolen(struct drm_device * dev)275 void i915_gem_cleanup_stolen(struct drm_device *dev)
276 {
277 struct drm_i915_private *dev_priv = dev->dev_private;
278
279 if (!drm_mm_initialized(&dev_priv->mm.stolen))
280 return;
281
282 drm_mm_takedown(&dev_priv->mm.stolen);
283 }
284
g4x_get_stolen_reserved(struct drm_i915_private * dev_priv,unsigned long * base,unsigned long * size)285 static void g4x_get_stolen_reserved(struct drm_i915_private *dev_priv,
286 unsigned long *base, unsigned long *size)
287 {
288 uint32_t reg_val = I915_READ(IS_GM45(dev_priv) ?
289 CTG_STOLEN_RESERVED :
290 ELK_STOLEN_RESERVED);
291 unsigned long stolen_top = dev_priv->mm.stolen_base +
292 dev_priv->gtt.stolen_size;
293
294 *base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16;
295
296 WARN_ON((reg_val & G4X_STOLEN_RESERVED_ADDR1_MASK) < *base);
297
298 /* On these platforms, the register doesn't have a size field, so the
299 * size is the distance between the base and the top of the stolen
300 * memory. We also have the genuine case where base is zero and there's
301 * nothing reserved. */
302 if (*base == 0)
303 *size = 0;
304 else
305 *size = stolen_top - *base;
306 }
307
gen6_get_stolen_reserved(struct drm_i915_private * dev_priv,unsigned long * base,unsigned long * size)308 static void gen6_get_stolen_reserved(struct drm_i915_private *dev_priv,
309 unsigned long *base, unsigned long *size)
310 {
311 uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
312
313 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
314
315 switch (reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK) {
316 case GEN6_STOLEN_RESERVED_1M:
317 *size = 1024 * 1024;
318 break;
319 case GEN6_STOLEN_RESERVED_512K:
320 *size = 512 * 1024;
321 break;
322 case GEN6_STOLEN_RESERVED_256K:
323 *size = 256 * 1024;
324 break;
325 case GEN6_STOLEN_RESERVED_128K:
326 *size = 128 * 1024;
327 break;
328 default:
329 *size = 1024 * 1024;
330 MISSING_CASE(reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK);
331 }
332 }
333
gen7_get_stolen_reserved(struct drm_i915_private * dev_priv,unsigned long * base,unsigned long * size)334 static void gen7_get_stolen_reserved(struct drm_i915_private *dev_priv,
335 unsigned long *base, unsigned long *size)
336 {
337 uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
338
339 *base = reg_val & GEN7_STOLEN_RESERVED_ADDR_MASK;
340
341 switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) {
342 case GEN7_STOLEN_RESERVED_1M:
343 *size = 1024 * 1024;
344 break;
345 case GEN7_STOLEN_RESERVED_256K:
346 *size = 256 * 1024;
347 break;
348 default:
349 *size = 1024 * 1024;
350 MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK);
351 }
352 }
353
gen8_get_stolen_reserved(struct drm_i915_private * dev_priv,unsigned long * base,unsigned long * size)354 static void gen8_get_stolen_reserved(struct drm_i915_private *dev_priv,
355 unsigned long *base, unsigned long *size)
356 {
357 uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
358
359 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
360
361 switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) {
362 case GEN8_STOLEN_RESERVED_1M:
363 *size = 1024 * 1024;
364 break;
365 case GEN8_STOLEN_RESERVED_2M:
366 *size = 2 * 1024 * 1024;
367 break;
368 case GEN8_STOLEN_RESERVED_4M:
369 *size = 4 * 1024 * 1024;
370 break;
371 case GEN8_STOLEN_RESERVED_8M:
372 *size = 8 * 1024 * 1024;
373 break;
374 default:
375 *size = 8 * 1024 * 1024;
376 MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK);
377 }
378 }
379
bdw_get_stolen_reserved(struct drm_i915_private * dev_priv,unsigned long * base,unsigned long * size)380 static void bdw_get_stolen_reserved(struct drm_i915_private *dev_priv,
381 unsigned long *base, unsigned long *size)
382 {
383 uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
384 unsigned long stolen_top;
385
386 stolen_top = dev_priv->mm.stolen_base + dev_priv->gtt.stolen_size;
387
388 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
389
390 /* On these platforms, the register doesn't have a size field, so the
391 * size is the distance between the base and the top of the stolen
392 * memory. We also have the genuine case where base is zero and there's
393 * nothing reserved. */
394 if (*base == 0)
395 *size = 0;
396 else
397 *size = stolen_top - *base;
398 }
399
i915_gem_init_stolen(struct drm_device * dev)400 int i915_gem_init_stolen(struct drm_device *dev)
401 {
402 struct drm_i915_private *dev_priv = dev->dev_private;
403 unsigned long reserved_total, reserved_base = 0, reserved_size;
404 unsigned long stolen_top;
405
406 mutex_init(&dev_priv->mm.stolen_lock);
407
408 #ifdef CONFIG_INTEL_IOMMU
409 if (intel_iommu_gfx_mapped && INTEL_INFO(dev)->gen < 8) {
410 DRM_INFO("DMAR active, disabling use of stolen memory\n");
411 return 0;
412 }
413 #endif
414
415 if (dev_priv->gtt.stolen_size == 0)
416 return 0;
417
418 dev_priv->mm.stolen_base = i915_stolen_to_physical(dev);
419 if (dev_priv->mm.stolen_base == 0)
420 return 0;
421
422 stolen_top = dev_priv->mm.stolen_base + dev_priv->gtt.stolen_size;
423
424 switch (INTEL_INFO(dev_priv)->gen) {
425 case 2:
426 case 3:
427 break;
428 case 4:
429 if (IS_G4X(dev))
430 g4x_get_stolen_reserved(dev_priv, &reserved_base,
431 &reserved_size);
432 break;
433 case 5:
434 /* Assume the gen6 maximum for the older platforms. */
435 reserved_size = 1024 * 1024;
436 reserved_base = stolen_top - reserved_size;
437 break;
438 case 6:
439 gen6_get_stolen_reserved(dev_priv, &reserved_base,
440 &reserved_size);
441 break;
442 case 7:
443 gen7_get_stolen_reserved(dev_priv, &reserved_base,
444 &reserved_size);
445 break;
446 default:
447 if (IS_BROADWELL(dev_priv) || IS_SKYLAKE(dev_priv))
448 bdw_get_stolen_reserved(dev_priv, &reserved_base,
449 &reserved_size);
450 else
451 gen8_get_stolen_reserved(dev_priv, &reserved_base,
452 &reserved_size);
453 break;
454 }
455
456 /* It is possible for the reserved base to be zero, but the register
457 * field for size doesn't have a zero option. */
458 if (reserved_base == 0) {
459 reserved_size = 0;
460 reserved_base = stolen_top;
461 }
462
463 if (reserved_base < dev_priv->mm.stolen_base ||
464 reserved_base + reserved_size > stolen_top) {
465 DRM_DEBUG_KMS("Stolen reserved area [0x%08lx - 0x%08lx] outside stolen memory [0x%08lx - 0x%08lx]\n",
466 reserved_base, reserved_base + reserved_size,
467 dev_priv->mm.stolen_base, stolen_top);
468 return 0;
469 }
470
471 /* It is possible for the reserved area to end before the end of stolen
472 * memory, so just consider the start. */
473 reserved_total = stolen_top - reserved_base;
474
475 DRM_DEBUG_KMS("Memory reserved for graphics device: %zuK, usable: %luK\n",
476 dev_priv->gtt.stolen_size >> 10,
477 (dev_priv->gtt.stolen_size - reserved_total) >> 10);
478
479 dev_priv->gtt.stolen_usable_size = dev_priv->gtt.stolen_size -
480 reserved_total;
481
482 /*
483 * Basic memrange allocator for stolen space.
484 *
485 * TODO: Notice that some platforms require us to not use the first page
486 * of the stolen memory but their BIOSes may still put the framebuffer
487 * on the first page. So we don't reserve this page for now because of
488 * that. Our current solution is to just prevent new nodes from being
489 * inserted on the first page - see the check we have at
490 * i915_gem_stolen_insert_node_in_range(). We may want to fix the fbcon
491 * problem later.
492 */
493 drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->gtt.stolen_usable_size);
494
495 return 0;
496 }
497
498 static struct sg_table *
i915_pages_create_for_stolen(struct drm_device * dev,u32 offset,u32 size)499 i915_pages_create_for_stolen(struct drm_device *dev,
500 u32 offset, u32 size)
501 {
502 struct drm_i915_private *dev_priv = dev->dev_private;
503 struct sg_table *st;
504 struct scatterlist *sg;
505
506 DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size);
507 BUG_ON(offset > dev_priv->gtt.stolen_size - size);
508
509 /* We hide that we have no struct page backing our stolen object
510 * by wrapping the contiguous physical allocation with a fake
511 * dma mapping in a single scatterlist.
512 */
513
514 st = kmalloc(sizeof(*st), GFP_KERNEL);
515 if (st == NULL)
516 return NULL;
517
518 if (sg_alloc_table(st, 1, GFP_KERNEL)) {
519 kfree(st);
520 return NULL;
521 }
522
523 sg = st->sgl;
524 sg->offset = 0;
525 sg->length = size;
526
527 sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset;
528 sg_dma_len(sg) = size;
529
530 return st;
531 }
532
i915_gem_object_get_pages_stolen(struct drm_i915_gem_object * obj)533 static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
534 {
535 BUG();
536 return -EINVAL;
537 }
538
i915_gem_object_put_pages_stolen(struct drm_i915_gem_object * obj)539 static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj)
540 {
541 /* Should only be called during free */
542 sg_free_table(obj->pages);
543 kfree(obj->pages);
544 }
545
546
547 static void
i915_gem_object_release_stolen(struct drm_i915_gem_object * obj)548 i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
549 {
550 struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
551
552 if (obj->stolen) {
553 i915_gem_stolen_remove_node(dev_priv, obj->stolen);
554 kfree(obj->stolen);
555 obj->stolen = NULL;
556 }
557 }
558 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
559 .get_pages = i915_gem_object_get_pages_stolen,
560 .put_pages = i915_gem_object_put_pages_stolen,
561 .release = i915_gem_object_release_stolen,
562 };
563
564 static struct drm_i915_gem_object *
_i915_gem_object_create_stolen(struct drm_device * dev,struct drm_mm_node * stolen)565 _i915_gem_object_create_stolen(struct drm_device *dev,
566 struct drm_mm_node *stolen)
567 {
568 struct drm_i915_gem_object *obj;
569
570 obj = i915_gem_object_alloc(dev);
571 if (obj == NULL)
572 return NULL;
573
574 drm_gem_private_object_init(dev, &obj->base, stolen->size);
575 i915_gem_object_init(obj, &i915_gem_object_stolen_ops);
576
577 obj->pages = i915_pages_create_for_stolen(dev,
578 stolen->start, stolen->size);
579 if (obj->pages == NULL)
580 goto cleanup;
581
582 i915_gem_object_pin_pages(obj);
583 obj->stolen = stolen;
584
585 obj->base.read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT;
586 obj->cache_level = HAS_LLC(dev) ? I915_CACHE_LLC : I915_CACHE_NONE;
587
588 return obj;
589
590 cleanup:
591 i915_gem_object_free(obj);
592 return NULL;
593 }
594
595 struct drm_i915_gem_object *
i915_gem_object_create_stolen(struct drm_device * dev,u32 size)596 i915_gem_object_create_stolen(struct drm_device *dev, u32 size)
597 {
598 struct drm_i915_private *dev_priv = dev->dev_private;
599 struct drm_i915_gem_object *obj;
600 struct drm_mm_node *stolen;
601 int ret;
602
603 if (!drm_mm_initialized(&dev_priv->mm.stolen))
604 return NULL;
605
606 DRM_DEBUG_KMS("creating stolen object: size=%x\n", size);
607 if (size == 0)
608 return NULL;
609
610 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
611 if (!stolen)
612 return NULL;
613
614 ret = i915_gem_stolen_insert_node(dev_priv, stolen, size, 4096);
615 if (ret) {
616 kfree(stolen);
617 return NULL;
618 }
619
620 obj = _i915_gem_object_create_stolen(dev, stolen);
621 if (obj)
622 return obj;
623
624 i915_gem_stolen_remove_node(dev_priv, stolen);
625 kfree(stolen);
626 return NULL;
627 }
628
629 struct drm_i915_gem_object *
i915_gem_object_create_stolen_for_preallocated(struct drm_device * dev,u32 stolen_offset,u32 gtt_offset,u32 size)630 i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
631 u32 stolen_offset,
632 u32 gtt_offset,
633 u32 size)
634 {
635 struct drm_i915_private *dev_priv = dev->dev_private;
636 struct i915_address_space *ggtt = &dev_priv->gtt.base;
637 struct drm_i915_gem_object *obj;
638 struct drm_mm_node *stolen;
639 struct i915_vma *vma;
640 int ret;
641
642 if (!drm_mm_initialized(&dev_priv->mm.stolen))
643 return NULL;
644
645 DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n",
646 stolen_offset, gtt_offset, size);
647
648 /* KISS and expect everything to be page-aligned */
649 if (WARN_ON(size == 0) || WARN_ON(size & 4095) ||
650 WARN_ON(stolen_offset & 4095))
651 return NULL;
652
653 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
654 if (!stolen)
655 return NULL;
656
657 stolen->start = stolen_offset;
658 stolen->size = size;
659 mutex_lock(&dev_priv->mm.stolen_lock);
660 ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen);
661 mutex_unlock(&dev_priv->mm.stolen_lock);
662 if (ret) {
663 DRM_DEBUG_KMS("failed to allocate stolen space\n");
664 kfree(stolen);
665 return NULL;
666 }
667
668 obj = _i915_gem_object_create_stolen(dev, stolen);
669 if (obj == NULL) {
670 DRM_DEBUG_KMS("failed to allocate stolen object\n");
671 i915_gem_stolen_remove_node(dev_priv, stolen);
672 kfree(stolen);
673 return NULL;
674 }
675
676 /* Some objects just need physical mem from stolen space */
677 if (gtt_offset == I915_GTT_OFFSET_NONE)
678 return obj;
679
680 vma = i915_gem_obj_lookup_or_create_vma(obj, ggtt);
681 if (IS_ERR(vma)) {
682 ret = PTR_ERR(vma);
683 goto err;
684 }
685
686 /* To simplify the initialisation sequence between KMS and GTT,
687 * we allow construction of the stolen object prior to
688 * setting up the GTT space. The actual reservation will occur
689 * later.
690 */
691 vma->node.start = gtt_offset;
692 vma->node.size = size;
693 if (drm_mm_initialized(&ggtt->mm)) {
694 ret = drm_mm_reserve_node(&ggtt->mm, &vma->node);
695 if (ret) {
696 DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
697 goto err;
698 }
699
700 vma->bound |= GLOBAL_BIND;
701 __i915_vma_set_map_and_fenceable(vma);
702 list_add_tail(&vma->mm_list, &ggtt->inactive_list);
703 }
704
705 list_add_tail(&obj->global_list, &dev_priv->mm.bound_list);
706 i915_gem_object_pin_pages(obj);
707
708 return obj;
709
710 err:
711 drm_gem_object_unreference(&obj->base);
712 return NULL;
713 }
714