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
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)45 int 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 /* WaSkipStolenMemoryFirstPage:bdw+ */
55 if (INTEL_GEN(dev_priv) >= 8 && start < 4096)
56 start = 4096;
57
58 mutex_lock(&dev_priv->mm.stolen_lock);
59 ret = drm_mm_insert_node_in_range(&dev_priv->mm.stolen, node,
60 size, alignment, 0,
61 start, end, DRM_MM_INSERT_BEST);
62 mutex_unlock(&dev_priv->mm.stolen_lock);
63
64 return ret;
65 }
66
i915_gem_stolen_insert_node(struct drm_i915_private * dev_priv,struct drm_mm_node * node,u64 size,unsigned alignment)67 int i915_gem_stolen_insert_node(struct drm_i915_private *dev_priv,
68 struct drm_mm_node *node, u64 size,
69 unsigned alignment)
70 {
71 return i915_gem_stolen_insert_node_in_range(dev_priv, node, size,
72 alignment, 0, U64_MAX);
73 }
74
i915_gem_stolen_remove_node(struct drm_i915_private * dev_priv,struct drm_mm_node * node)75 void i915_gem_stolen_remove_node(struct drm_i915_private *dev_priv,
76 struct drm_mm_node *node)
77 {
78 mutex_lock(&dev_priv->mm.stolen_lock);
79 drm_mm_remove_node(node);
80 mutex_unlock(&dev_priv->mm.stolen_lock);
81 }
82
i915_adjust_stolen(struct drm_i915_private * dev_priv,struct resource * dsm)83 static int i915_adjust_stolen(struct drm_i915_private *dev_priv,
84 struct resource *dsm)
85 {
86 struct i915_ggtt *ggtt = &dev_priv->ggtt;
87 struct resource *r;
88
89 if (dsm->start == 0 || dsm->end <= dsm->start)
90 return -EINVAL;
91
92 /*
93 * TODO: We have yet too encounter the case where the GTT wasn't at the
94 * end of stolen. With that assumption we could simplify this.
95 */
96
97 /* Make sure we don't clobber the GTT if it's within stolen memory */
98 if (INTEL_GEN(dev_priv) <= 4 &&
99 !IS_G33(dev_priv) && !IS_PINEVIEW(dev_priv) && !IS_G4X(dev_priv)) {
100 struct resource stolen[2] = {*dsm, *dsm};
101 struct resource ggtt_res;
102 resource_size_t ggtt_start;
103
104 ggtt_start = I915_READ(PGTBL_CTL);
105 if (IS_GEN4(dev_priv))
106 ggtt_start = (ggtt_start & PGTBL_ADDRESS_LO_MASK) |
107 (ggtt_start & PGTBL_ADDRESS_HI_MASK) << 28;
108 else
109 ggtt_start &= PGTBL_ADDRESS_LO_MASK;
110
111 ggtt_res =
112 (struct resource) DEFINE_RES_MEM(ggtt_start,
113 ggtt_total_entries(ggtt) * 4);
114
115 if (ggtt_res.start >= stolen[0].start && ggtt_res.start < stolen[0].end)
116 stolen[0].end = ggtt_res.start;
117 if (ggtt_res.end > stolen[1].start && ggtt_res.end <= stolen[1].end)
118 stolen[1].start = ggtt_res.end;
119
120 /* Pick the larger of the two chunks */
121 if (resource_size(&stolen[0]) > resource_size(&stolen[1]))
122 *dsm = stolen[0];
123 else
124 *dsm = stolen[1];
125
126 if (stolen[0].start != stolen[1].start ||
127 stolen[0].end != stolen[1].end) {
128 DRM_DEBUG_DRIVER("GTT within stolen memory at %pR\n", &ggtt_res);
129 DRM_DEBUG_DRIVER("Stolen memory adjusted to %pR\n", dsm);
130 }
131 }
132
133 /*
134 * Verify that nothing else uses this physical address. Stolen
135 * memory should be reserved by the BIOS and hidden from the
136 * kernel. So if the region is already marked as busy, something
137 * is seriously wrong.
138 */
139 r = devm_request_mem_region(dev_priv->drm.dev, dsm->start,
140 resource_size(dsm),
141 "Graphics Stolen Memory");
142 if (r == NULL) {
143 /*
144 * One more attempt but this time requesting region from
145 * start + 1, as we have seen that this resolves the region
146 * conflict with the PCI Bus.
147 * This is a BIOS w/a: Some BIOS wrap stolen in the root
148 * PCI bus, but have an off-by-one error. Hence retry the
149 * reservation starting from 1 instead of 0.
150 * There's also BIOS with off-by-one on the other end.
151 */
152 r = devm_request_mem_region(dev_priv->drm.dev, dsm->start + 1,
153 resource_size(dsm) - 2,
154 "Graphics Stolen Memory");
155 /*
156 * GEN3 firmware likes to smash pci bridges into the stolen
157 * range. Apparently this works.
158 */
159 if (r == NULL && !IS_GEN3(dev_priv)) {
160 DRM_ERROR("conflict detected with stolen region: %pR\n",
161 dsm);
162
163 return -EBUSY;
164 }
165 }
166
167 return 0;
168 }
169
i915_gem_cleanup_stolen(struct drm_device * dev)170 void i915_gem_cleanup_stolen(struct drm_device *dev)
171 {
172 struct drm_i915_private *dev_priv = to_i915(dev);
173
174 if (!drm_mm_initialized(&dev_priv->mm.stolen))
175 return;
176
177 drm_mm_takedown(&dev_priv->mm.stolen);
178 }
179
g4x_get_stolen_reserved(struct drm_i915_private * dev_priv,resource_size_t * base,resource_size_t * size)180 static void g4x_get_stolen_reserved(struct drm_i915_private *dev_priv,
181 resource_size_t *base,
182 resource_size_t *size)
183 {
184 u32 reg_val = I915_READ(IS_GM45(dev_priv) ?
185 CTG_STOLEN_RESERVED :
186 ELK_STOLEN_RESERVED);
187 resource_size_t stolen_top = dev_priv->dsm.end + 1;
188
189 DRM_DEBUG_DRIVER("%s_STOLEN_RESERVED = %08x\n",
190 IS_GM45(dev_priv) ? "CTG" : "ELK", reg_val);
191
192 if ((reg_val & G4X_STOLEN_RESERVED_ENABLE) == 0)
193 return;
194
195 /*
196 * Whether ILK really reuses the ELK register for this is unclear.
197 * Let's see if we catch anyone with this supposedly enabled on ILK.
198 */
199 WARN(IS_GEN5(dev_priv), "ILK stolen reserved found? 0x%08x\n", reg_val);
200
201 if (!(reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK))
202 return;
203
204 *base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16;
205 WARN_ON((reg_val & G4X_STOLEN_RESERVED_ADDR1_MASK) < *base);
206
207 *size = stolen_top - *base;
208 }
209
gen6_get_stolen_reserved(struct drm_i915_private * dev_priv,resource_size_t * base,resource_size_t * size)210 static void gen6_get_stolen_reserved(struct drm_i915_private *dev_priv,
211 resource_size_t *base,
212 resource_size_t *size)
213 {
214 u32 reg_val = I915_READ(GEN6_STOLEN_RESERVED);
215
216 DRM_DEBUG_DRIVER("GEN6_STOLEN_RESERVED = %08x\n", reg_val);
217
218 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
219 return;
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
vlv_get_stolen_reserved(struct drm_i915_private * dev_priv,resource_size_t * base,resource_size_t * size)242 static void vlv_get_stolen_reserved(struct drm_i915_private *dev_priv,
243 resource_size_t *base,
244 resource_size_t *size)
245 {
246 u32 reg_val = I915_READ(GEN6_STOLEN_RESERVED);
247 resource_size_t stolen_top = dev_priv->dsm.end + 1;
248
249 DRM_DEBUG_DRIVER("GEN6_STOLEN_RESERVED = %08x\n", reg_val);
250
251 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
252 return;
253
254 switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) {
255 default:
256 MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK);
257 /* fall through */
258 case GEN7_STOLEN_RESERVED_1M:
259 *size = 1024 * 1024;
260 break;
261 }
262
263 /*
264 * On vlv, the ADDR_MASK portion is left as 0 and HW deduces the
265 * reserved location as (top - size).
266 */
267 *base = stolen_top - *size;
268 }
269
gen7_get_stolen_reserved(struct drm_i915_private * dev_priv,resource_size_t * base,resource_size_t * size)270 static void gen7_get_stolen_reserved(struct drm_i915_private *dev_priv,
271 resource_size_t *base,
272 resource_size_t *size)
273 {
274 u32 reg_val = I915_READ(GEN6_STOLEN_RESERVED);
275
276 DRM_DEBUG_DRIVER("GEN6_STOLEN_RESERVED = %08x\n", reg_val);
277
278 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
279 return;
280
281 *base = reg_val & GEN7_STOLEN_RESERVED_ADDR_MASK;
282
283 switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) {
284 case GEN7_STOLEN_RESERVED_1M:
285 *size = 1024 * 1024;
286 break;
287 case GEN7_STOLEN_RESERVED_256K:
288 *size = 256 * 1024;
289 break;
290 default:
291 *size = 1024 * 1024;
292 MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK);
293 }
294 }
295
chv_get_stolen_reserved(struct drm_i915_private * dev_priv,resource_size_t * base,resource_size_t * size)296 static void chv_get_stolen_reserved(struct drm_i915_private *dev_priv,
297 resource_size_t *base,
298 resource_size_t *size)
299 {
300 u32 reg_val = I915_READ(GEN6_STOLEN_RESERVED);
301
302 DRM_DEBUG_DRIVER("GEN6_STOLEN_RESERVED = %08x\n", reg_val);
303
304 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
305 return;
306
307 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
308
309 switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) {
310 case GEN8_STOLEN_RESERVED_1M:
311 *size = 1024 * 1024;
312 break;
313 case GEN8_STOLEN_RESERVED_2M:
314 *size = 2 * 1024 * 1024;
315 break;
316 case GEN8_STOLEN_RESERVED_4M:
317 *size = 4 * 1024 * 1024;
318 break;
319 case GEN8_STOLEN_RESERVED_8M:
320 *size = 8 * 1024 * 1024;
321 break;
322 default:
323 *size = 8 * 1024 * 1024;
324 MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK);
325 }
326 }
327
bdw_get_stolen_reserved(struct drm_i915_private * dev_priv,resource_size_t * base,resource_size_t * size)328 static void bdw_get_stolen_reserved(struct drm_i915_private *dev_priv,
329 resource_size_t *base,
330 resource_size_t *size)
331 {
332 u32 reg_val = I915_READ(GEN6_STOLEN_RESERVED);
333 resource_size_t stolen_top = dev_priv->dsm.end + 1;
334
335 DRM_DEBUG_DRIVER("GEN6_STOLEN_RESERVED = %08x\n", reg_val);
336
337 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
338 return;
339
340 if (!(reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK))
341 return;
342
343 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
344 *size = stolen_top - *base;
345 }
346
icl_get_stolen_reserved(struct drm_i915_private * dev_priv,resource_size_t * base,resource_size_t * size)347 static void icl_get_stolen_reserved(struct drm_i915_private *dev_priv,
348 resource_size_t *base,
349 resource_size_t *size)
350 {
351 u64 reg_val = I915_READ64(GEN6_STOLEN_RESERVED);
352
353 DRM_DEBUG_DRIVER("GEN6_STOLEN_RESERVED = 0x%016llx\n", reg_val);
354
355 *base = reg_val & GEN11_STOLEN_RESERVED_ADDR_MASK;
356
357 switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) {
358 case GEN8_STOLEN_RESERVED_1M:
359 *size = 1024 * 1024;
360 break;
361 case GEN8_STOLEN_RESERVED_2M:
362 *size = 2 * 1024 * 1024;
363 break;
364 case GEN8_STOLEN_RESERVED_4M:
365 *size = 4 * 1024 * 1024;
366 break;
367 case GEN8_STOLEN_RESERVED_8M:
368 *size = 8 * 1024 * 1024;
369 break;
370 default:
371 *size = 8 * 1024 * 1024;
372 MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK);
373 }
374 }
375
i915_gem_init_stolen(struct drm_i915_private * dev_priv)376 int i915_gem_init_stolen(struct drm_i915_private *dev_priv)
377 {
378 resource_size_t reserved_base, stolen_top;
379 resource_size_t reserved_total, reserved_size;
380
381 mutex_init(&dev_priv->mm.stolen_lock);
382
383 if (intel_vgpu_active(dev_priv)) {
384 DRM_INFO("iGVT-g active, disabling use of stolen memory\n");
385 return 0;
386 }
387
388 if (intel_vtd_active() && INTEL_GEN(dev_priv) < 8) {
389 DRM_INFO("DMAR active, disabling use of stolen memory\n");
390 return 0;
391 }
392
393 if (resource_size(&intel_graphics_stolen_res) == 0)
394 return 0;
395
396 dev_priv->dsm = intel_graphics_stolen_res;
397
398 if (i915_adjust_stolen(dev_priv, &dev_priv->dsm))
399 return 0;
400
401 GEM_BUG_ON(dev_priv->dsm.start == 0);
402 GEM_BUG_ON(dev_priv->dsm.end <= dev_priv->dsm.start);
403
404 stolen_top = dev_priv->dsm.end + 1;
405 reserved_base = stolen_top;
406 reserved_size = 0;
407
408 switch (INTEL_GEN(dev_priv)) {
409 case 2:
410 case 3:
411 break;
412 case 4:
413 if (!IS_G4X(dev_priv))
414 break;
415 /* fall through */
416 case 5:
417 g4x_get_stolen_reserved(dev_priv,
418 &reserved_base, &reserved_size);
419 break;
420 case 6:
421 gen6_get_stolen_reserved(dev_priv,
422 &reserved_base, &reserved_size);
423 break;
424 case 7:
425 if (IS_VALLEYVIEW(dev_priv))
426 vlv_get_stolen_reserved(dev_priv,
427 &reserved_base, &reserved_size);
428 else
429 gen7_get_stolen_reserved(dev_priv,
430 &reserved_base, &reserved_size);
431 break;
432 case 8:
433 case 9:
434 case 10:
435 if (IS_LP(dev_priv))
436 chv_get_stolen_reserved(dev_priv,
437 &reserved_base, &reserved_size);
438 else
439 bdw_get_stolen_reserved(dev_priv,
440 &reserved_base, &reserved_size);
441 break;
442 case 11:
443 default:
444 icl_get_stolen_reserved(dev_priv, &reserved_base,
445 &reserved_size);
446 break;
447 }
448
449 /*
450 * Our expectation is that the reserved space is at the top of the
451 * stolen region and *never* at the bottom. If we see !reserved_base,
452 * it likely means we failed to read the registers correctly.
453 */
454 if (!reserved_base) {
455 DRM_ERROR("inconsistent reservation %pa + %pa; ignoring\n",
456 &reserved_base, &reserved_size);
457 reserved_base = stolen_top;
458 reserved_size = 0;
459 }
460
461 dev_priv->dsm_reserved =
462 (struct resource) DEFINE_RES_MEM(reserved_base, reserved_size);
463
464 if (!resource_contains(&dev_priv->dsm, &dev_priv->dsm_reserved)) {
465 DRM_ERROR("Stolen reserved area %pR outside stolen memory %pR\n",
466 &dev_priv->dsm_reserved, &dev_priv->dsm);
467 return 0;
468 }
469
470 /* It is possible for the reserved area to end before the end of stolen
471 * memory, so just consider the start. */
472 reserved_total = stolen_top - reserved_base;
473
474 DRM_DEBUG_DRIVER("Memory reserved for graphics device: %lluK, usable: %lluK\n",
475 (u64)resource_size(&dev_priv->dsm) >> 10,
476 ((u64)resource_size(&dev_priv->dsm) - reserved_total) >> 10);
477
478 dev_priv->stolen_usable_size =
479 resource_size(&dev_priv->dsm) - reserved_total;
480
481 /* Basic memrange allocator for stolen space. */
482 drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->stolen_usable_size);
483
484 return 0;
485 }
486
487 static struct sg_table *
i915_pages_create_for_stolen(struct drm_device * dev,resource_size_t offset,resource_size_t size)488 i915_pages_create_for_stolen(struct drm_device *dev,
489 resource_size_t offset, resource_size_t size)
490 {
491 struct drm_i915_private *dev_priv = to_i915(dev);
492 struct sg_table *st;
493 struct scatterlist *sg;
494
495 GEM_BUG_ON(range_overflows(offset, size, resource_size(&dev_priv->dsm)));
496
497 /* We hide that we have no struct page backing our stolen object
498 * by wrapping the contiguous physical allocation with a fake
499 * dma mapping in a single scatterlist.
500 */
501
502 st = kmalloc(sizeof(*st), GFP_KERNEL);
503 if (st == NULL)
504 return ERR_PTR(-ENOMEM);
505
506 if (sg_alloc_table(st, 1, GFP_KERNEL)) {
507 kfree(st);
508 return ERR_PTR(-ENOMEM);
509 }
510
511 sg = st->sgl;
512 sg->offset = 0;
513 sg->length = size;
514
515 sg_dma_address(sg) = (dma_addr_t)dev_priv->dsm.start + offset;
516 sg_dma_len(sg) = size;
517
518 return st;
519 }
520
i915_gem_object_get_pages_stolen(struct drm_i915_gem_object * obj)521 static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
522 {
523 struct sg_table *pages =
524 i915_pages_create_for_stolen(obj->base.dev,
525 obj->stolen->start,
526 obj->stolen->size);
527 if (IS_ERR(pages))
528 return PTR_ERR(pages);
529
530 __i915_gem_object_set_pages(obj, pages, obj->stolen->size);
531
532 return 0;
533 }
534
i915_gem_object_put_pages_stolen(struct drm_i915_gem_object * obj,struct sg_table * pages)535 static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj,
536 struct sg_table *pages)
537 {
538 /* Should only be called from i915_gem_object_release_stolen() */
539 sg_free_table(pages);
540 kfree(pages);
541 }
542
543 static void
i915_gem_object_release_stolen(struct drm_i915_gem_object * obj)544 i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
545 {
546 struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
547 struct drm_mm_node *stolen = fetch_and_zero(&obj->stolen);
548
549 GEM_BUG_ON(!stolen);
550
551 __i915_gem_object_unpin_pages(obj);
552
553 i915_gem_stolen_remove_node(dev_priv, stolen);
554 kfree(stolen);
555 }
556
557 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
558 .get_pages = i915_gem_object_get_pages_stolen,
559 .put_pages = i915_gem_object_put_pages_stolen,
560 .release = i915_gem_object_release_stolen,
561 };
562
563 static struct drm_i915_gem_object *
_i915_gem_object_create_stolen(struct drm_i915_private * dev_priv,struct drm_mm_node * stolen)564 _i915_gem_object_create_stolen(struct drm_i915_private *dev_priv,
565 struct drm_mm_node *stolen)
566 {
567 struct drm_i915_gem_object *obj;
568 unsigned int cache_level;
569
570 obj = i915_gem_object_alloc(dev_priv);
571 if (obj == NULL)
572 return NULL;
573
574 drm_gem_private_object_init(&dev_priv->drm, &obj->base, stolen->size);
575 i915_gem_object_init(obj, &i915_gem_object_stolen_ops);
576
577 obj->stolen = stolen;
578 obj->read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT;
579 cache_level = HAS_LLC(dev_priv) ? I915_CACHE_LLC : I915_CACHE_NONE;
580 i915_gem_object_set_cache_coherency(obj, cache_level);
581
582 if (i915_gem_object_pin_pages(obj))
583 goto cleanup;
584
585 return obj;
586
587 cleanup:
588 i915_gem_object_free(obj);
589 return NULL;
590 }
591
592 struct drm_i915_gem_object *
i915_gem_object_create_stolen(struct drm_i915_private * dev_priv,resource_size_t size)593 i915_gem_object_create_stolen(struct drm_i915_private *dev_priv,
594 resource_size_t size)
595 {
596 struct drm_i915_gem_object *obj;
597 struct drm_mm_node *stolen;
598 int ret;
599
600 if (!drm_mm_initialized(&dev_priv->mm.stolen))
601 return NULL;
602
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_priv, 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
625 struct drm_i915_gem_object *
i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private * dev_priv,resource_size_t stolen_offset,resource_size_t gtt_offset,resource_size_t size)626 i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private *dev_priv,
627 resource_size_t stolen_offset,
628 resource_size_t gtt_offset,
629 resource_size_t size)
630 {
631 struct i915_ggtt *ggtt = &dev_priv->ggtt;
632 struct drm_i915_gem_object *obj;
633 struct drm_mm_node *stolen;
634 struct i915_vma *vma;
635 int ret;
636
637 if (!drm_mm_initialized(&dev_priv->mm.stolen))
638 return NULL;
639
640 lockdep_assert_held(&dev_priv->drm.struct_mutex);
641
642 DRM_DEBUG_DRIVER("creating preallocated stolen object: stolen_offset=%pa, gtt_offset=%pa, size=%pa\n",
643 &stolen_offset, >t_offset, &size);
644
645 /* KISS and expect everything to be page-aligned */
646 if (WARN_ON(size == 0) ||
647 WARN_ON(!IS_ALIGNED(size, I915_GTT_PAGE_SIZE)) ||
648 WARN_ON(!IS_ALIGNED(stolen_offset, I915_GTT_MIN_ALIGNMENT)))
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_DRIVER("failed to allocate stolen space\n");
662 kfree(stolen);
663 return NULL;
664 }
665
666 obj = _i915_gem_object_create_stolen(dev_priv, stolen);
667 if (obj == NULL) {
668 DRM_DEBUG_DRIVER("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 ret = i915_gem_object_pin_pages(obj);
679 if (ret)
680 goto err;
681
682 vma = i915_vma_instance(obj, &ggtt->vm, NULL);
683 if (IS_ERR(vma)) {
684 ret = PTR_ERR(vma);
685 goto err_pages;
686 }
687
688 /* To simplify the initialisation sequence between KMS and GTT,
689 * we allow construction of the stolen object prior to
690 * setting up the GTT space. The actual reservation will occur
691 * later.
692 */
693 ret = i915_gem_gtt_reserve(&ggtt->vm, &vma->node,
694 size, gtt_offset, obj->cache_level,
695 0);
696 if (ret) {
697 DRM_DEBUG_DRIVER("failed to allocate stolen GTT space\n");
698 goto err_pages;
699 }
700
701 GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
702
703 vma->pages = obj->mm.pages;
704 vma->flags |= I915_VMA_GLOBAL_BIND;
705 __i915_vma_set_map_and_fenceable(vma);
706 list_move_tail(&vma->vm_link, &ggtt->vm.inactive_list);
707
708 spin_lock(&dev_priv->mm.obj_lock);
709 list_move_tail(&obj->mm.link, &dev_priv->mm.bound_list);
710 obj->bind_count++;
711 spin_unlock(&dev_priv->mm.obj_lock);
712
713 return obj;
714
715 err_pages:
716 i915_gem_object_unpin_pages(obj);
717 err:
718 i915_gem_object_put(obj);
719 return NULL;
720 }
721
