1 /*
2 * SPDX-License-Identifier: MIT
3 *
4 * Copyright © 2008-2012 Intel Corporation
5 */
6
7 #include <linux/errno.h>
8 #include <linux/mutex.h>
9
10 #include <drm/drm_mm.h>
11 #include <drm/i915_drm.h>
12
13 #include "i915_drv.h"
14 #include "i915_gem_stolen.h"
15
16 /*
17 * The BIOS typically reserves some of the system's memory for the exclusive
18 * use of the integrated graphics. This memory is no longer available for
19 * use by the OS and so the user finds that his system has less memory
20 * available than he put in. We refer to this memory as stolen.
21 *
22 * The BIOS will allocate its framebuffer from the stolen memory. Our
23 * goal is try to reuse that object for our own fbcon which must always
24 * be available for panics. Anything else we can reuse the stolen memory
25 * for is a boon.
26 */
27
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)28 int i915_gem_stolen_insert_node_in_range(struct drm_i915_private *dev_priv,
29 struct drm_mm_node *node, u64 size,
30 unsigned alignment, u64 start, u64 end)
31 {
32 int ret;
33
34 if (!drm_mm_initialized(&dev_priv->mm.stolen))
35 return -ENODEV;
36
37 /* WaSkipStolenMemoryFirstPage:bdw+ */
38 if (INTEL_GEN(dev_priv) >= 8 && start < 4096)
39 start = 4096;
40
41 mutex_lock(&dev_priv->mm.stolen_lock);
42 ret = drm_mm_insert_node_in_range(&dev_priv->mm.stolen, node,
43 size, alignment, 0,
44 start, end, DRM_MM_INSERT_BEST);
45 mutex_unlock(&dev_priv->mm.stolen_lock);
46
47 return ret;
48 }
49
i915_gem_stolen_insert_node(struct drm_i915_private * dev_priv,struct drm_mm_node * node,u64 size,unsigned alignment)50 int i915_gem_stolen_insert_node(struct drm_i915_private *dev_priv,
51 struct drm_mm_node *node, u64 size,
52 unsigned alignment)
53 {
54 return i915_gem_stolen_insert_node_in_range(dev_priv, node, size,
55 alignment, 0, U64_MAX);
56 }
57
i915_gem_stolen_remove_node(struct drm_i915_private * dev_priv,struct drm_mm_node * node)58 void i915_gem_stolen_remove_node(struct drm_i915_private *dev_priv,
59 struct drm_mm_node *node)
60 {
61 mutex_lock(&dev_priv->mm.stolen_lock);
62 drm_mm_remove_node(node);
63 mutex_unlock(&dev_priv->mm.stolen_lock);
64 }
65
i915_adjust_stolen(struct drm_i915_private * dev_priv,struct resource * dsm)66 static int i915_adjust_stolen(struct drm_i915_private *dev_priv,
67 struct resource *dsm)
68 {
69 struct i915_ggtt *ggtt = &dev_priv->ggtt;
70 struct resource *r;
71
72 if (dsm->start == 0 || dsm->end <= dsm->start)
73 return -EINVAL;
74
75 /*
76 * TODO: We have yet too encounter the case where the GTT wasn't at the
77 * end of stolen. With that assumption we could simplify this.
78 */
79
80 /* Make sure we don't clobber the GTT if it's within stolen memory */
81 if (INTEL_GEN(dev_priv) <= 4 &&
82 !IS_G33(dev_priv) && !IS_PINEVIEW(dev_priv) && !IS_G4X(dev_priv)) {
83 struct resource stolen[2] = {*dsm, *dsm};
84 struct resource ggtt_res;
85 resource_size_t ggtt_start;
86
87 ggtt_start = I915_READ(PGTBL_CTL);
88 if (IS_GEN(dev_priv, 4))
89 ggtt_start = (ggtt_start & PGTBL_ADDRESS_LO_MASK) |
90 (ggtt_start & PGTBL_ADDRESS_HI_MASK) << 28;
91 else
92 ggtt_start &= PGTBL_ADDRESS_LO_MASK;
93
94 ggtt_res =
95 (struct resource) DEFINE_RES_MEM(ggtt_start,
96 ggtt_total_entries(ggtt) * 4);
97
98 if (ggtt_res.start >= stolen[0].start && ggtt_res.start < stolen[0].end)
99 stolen[0].end = ggtt_res.start;
100 if (ggtt_res.end > stolen[1].start && ggtt_res.end <= stolen[1].end)
101 stolen[1].start = ggtt_res.end;
102
103 /* Pick the larger of the two chunks */
104 if (resource_size(&stolen[0]) > resource_size(&stolen[1]))
105 *dsm = stolen[0];
106 else
107 *dsm = stolen[1];
108
109 if (stolen[0].start != stolen[1].start ||
110 stolen[0].end != stolen[1].end) {
111 DRM_DEBUG_DRIVER("GTT within stolen memory at %pR\n", &ggtt_res);
112 DRM_DEBUG_DRIVER("Stolen memory adjusted to %pR\n", dsm);
113 }
114 }
115
116 /*
117 * Verify that nothing else uses this physical address. Stolen
118 * memory should be reserved by the BIOS and hidden from the
119 * kernel. So if the region is already marked as busy, something
120 * is seriously wrong.
121 */
122 r = devm_request_mem_region(dev_priv->drm.dev, dsm->start,
123 resource_size(dsm),
124 "Graphics Stolen Memory");
125 if (r == NULL) {
126 /*
127 * One more attempt but this time requesting region from
128 * start + 1, as we have seen that this resolves the region
129 * conflict with the PCI Bus.
130 * This is a BIOS w/a: Some BIOS wrap stolen in the root
131 * PCI bus, but have an off-by-one error. Hence retry the
132 * reservation starting from 1 instead of 0.
133 * There's also BIOS with off-by-one on the other end.
134 */
135 r = devm_request_mem_region(dev_priv->drm.dev, dsm->start + 1,
136 resource_size(dsm) - 2,
137 "Graphics Stolen Memory");
138 /*
139 * GEN3 firmware likes to smash pci bridges into the stolen
140 * range. Apparently this works.
141 */
142 if (r == NULL && !IS_GEN(dev_priv, 3)) {
143 DRM_ERROR("conflict detected with stolen region: %pR\n",
144 dsm);
145
146 return -EBUSY;
147 }
148 }
149
150 return 0;
151 }
152
i915_gem_cleanup_stolen(struct drm_i915_private * dev_priv)153 void i915_gem_cleanup_stolen(struct drm_i915_private *dev_priv)
154 {
155 if (!drm_mm_initialized(&dev_priv->mm.stolen))
156 return;
157
158 drm_mm_takedown(&dev_priv->mm.stolen);
159 }
160
g4x_get_stolen_reserved(struct drm_i915_private * dev_priv,resource_size_t * base,resource_size_t * size)161 static void g4x_get_stolen_reserved(struct drm_i915_private *dev_priv,
162 resource_size_t *base,
163 resource_size_t *size)
164 {
165 u32 reg_val = I915_READ(IS_GM45(dev_priv) ?
166 CTG_STOLEN_RESERVED :
167 ELK_STOLEN_RESERVED);
168 resource_size_t stolen_top = dev_priv->dsm.end + 1;
169
170 DRM_DEBUG_DRIVER("%s_STOLEN_RESERVED = %08x\n",
171 IS_GM45(dev_priv) ? "CTG" : "ELK", reg_val);
172
173 if ((reg_val & G4X_STOLEN_RESERVED_ENABLE) == 0)
174 return;
175
176 /*
177 * Whether ILK really reuses the ELK register for this is unclear.
178 * Let's see if we catch anyone with this supposedly enabled on ILK.
179 */
180 WARN(IS_GEN(dev_priv, 5), "ILK stolen reserved found? 0x%08x\n",
181 reg_val);
182
183 if (!(reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK))
184 return;
185
186 *base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16;
187 WARN_ON((reg_val & G4X_STOLEN_RESERVED_ADDR1_MASK) < *base);
188
189 *size = stolen_top - *base;
190 }
191
gen6_get_stolen_reserved(struct drm_i915_private * dev_priv,resource_size_t * base,resource_size_t * size)192 static void gen6_get_stolen_reserved(struct drm_i915_private *dev_priv,
193 resource_size_t *base,
194 resource_size_t *size)
195 {
196 u32 reg_val = I915_READ(GEN6_STOLEN_RESERVED);
197
198 DRM_DEBUG_DRIVER("GEN6_STOLEN_RESERVED = %08x\n", reg_val);
199
200 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
201 return;
202
203 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
204
205 switch (reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK) {
206 case GEN6_STOLEN_RESERVED_1M:
207 *size = 1024 * 1024;
208 break;
209 case GEN6_STOLEN_RESERVED_512K:
210 *size = 512 * 1024;
211 break;
212 case GEN6_STOLEN_RESERVED_256K:
213 *size = 256 * 1024;
214 break;
215 case GEN6_STOLEN_RESERVED_128K:
216 *size = 128 * 1024;
217 break;
218 default:
219 *size = 1024 * 1024;
220 MISSING_CASE(reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK);
221 }
222 }
223
vlv_get_stolen_reserved(struct drm_i915_private * dev_priv,resource_size_t * base,resource_size_t * size)224 static void vlv_get_stolen_reserved(struct drm_i915_private *dev_priv,
225 resource_size_t *base,
226 resource_size_t *size)
227 {
228 u32 reg_val = I915_READ(GEN6_STOLEN_RESERVED);
229 resource_size_t stolen_top = dev_priv->dsm.end + 1;
230
231 DRM_DEBUG_DRIVER("GEN6_STOLEN_RESERVED = %08x\n", reg_val);
232
233 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
234 return;
235
236 switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) {
237 default:
238 MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK);
239 /* fall through */
240 case GEN7_STOLEN_RESERVED_1M:
241 *size = 1024 * 1024;
242 break;
243 }
244
245 /*
246 * On vlv, the ADDR_MASK portion is left as 0 and HW deduces the
247 * reserved location as (top - size).
248 */
249 *base = stolen_top - *size;
250 }
251
gen7_get_stolen_reserved(struct drm_i915_private * dev_priv,resource_size_t * base,resource_size_t * size)252 static void gen7_get_stolen_reserved(struct drm_i915_private *dev_priv,
253 resource_size_t *base,
254 resource_size_t *size)
255 {
256 u32 reg_val = I915_READ(GEN6_STOLEN_RESERVED);
257
258 DRM_DEBUG_DRIVER("GEN6_STOLEN_RESERVED = %08x\n", reg_val);
259
260 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
261 return;
262
263 *base = reg_val & GEN7_STOLEN_RESERVED_ADDR_MASK;
264
265 switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) {
266 case GEN7_STOLEN_RESERVED_1M:
267 *size = 1024 * 1024;
268 break;
269 case GEN7_STOLEN_RESERVED_256K:
270 *size = 256 * 1024;
271 break;
272 default:
273 *size = 1024 * 1024;
274 MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK);
275 }
276 }
277
chv_get_stolen_reserved(struct drm_i915_private * dev_priv,resource_size_t * base,resource_size_t * size)278 static void chv_get_stolen_reserved(struct drm_i915_private *dev_priv,
279 resource_size_t *base,
280 resource_size_t *size)
281 {
282 u32 reg_val = I915_READ(GEN6_STOLEN_RESERVED);
283
284 DRM_DEBUG_DRIVER("GEN6_STOLEN_RESERVED = %08x\n", reg_val);
285
286 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
287 return;
288
289 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
290
291 switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) {
292 case GEN8_STOLEN_RESERVED_1M:
293 *size = 1024 * 1024;
294 break;
295 case GEN8_STOLEN_RESERVED_2M:
296 *size = 2 * 1024 * 1024;
297 break;
298 case GEN8_STOLEN_RESERVED_4M:
299 *size = 4 * 1024 * 1024;
300 break;
301 case GEN8_STOLEN_RESERVED_8M:
302 *size = 8 * 1024 * 1024;
303 break;
304 default:
305 *size = 8 * 1024 * 1024;
306 MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK);
307 }
308 }
309
bdw_get_stolen_reserved(struct drm_i915_private * dev_priv,resource_size_t * base,resource_size_t * size)310 static void bdw_get_stolen_reserved(struct drm_i915_private *dev_priv,
311 resource_size_t *base,
312 resource_size_t *size)
313 {
314 u32 reg_val = I915_READ(GEN6_STOLEN_RESERVED);
315 resource_size_t stolen_top = dev_priv->dsm.end + 1;
316
317 DRM_DEBUG_DRIVER("GEN6_STOLEN_RESERVED = %08x\n", reg_val);
318
319 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
320 return;
321
322 if (!(reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK))
323 return;
324
325 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
326 *size = stolen_top - *base;
327 }
328
icl_get_stolen_reserved(struct drm_i915_private * i915,resource_size_t * base,resource_size_t * size)329 static void icl_get_stolen_reserved(struct drm_i915_private *i915,
330 resource_size_t *base,
331 resource_size_t *size)
332 {
333 u64 reg_val = intel_uncore_read64(&i915->uncore, GEN6_STOLEN_RESERVED);
334
335 DRM_DEBUG_DRIVER("GEN6_STOLEN_RESERVED = 0x%016llx\n", reg_val);
336
337 *base = reg_val & GEN11_STOLEN_RESERVED_ADDR_MASK;
338
339 switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) {
340 case GEN8_STOLEN_RESERVED_1M:
341 *size = 1024 * 1024;
342 break;
343 case GEN8_STOLEN_RESERVED_2M:
344 *size = 2 * 1024 * 1024;
345 break;
346 case GEN8_STOLEN_RESERVED_4M:
347 *size = 4 * 1024 * 1024;
348 break;
349 case GEN8_STOLEN_RESERVED_8M:
350 *size = 8 * 1024 * 1024;
351 break;
352 default:
353 *size = 8 * 1024 * 1024;
354 MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK);
355 }
356 }
357
i915_gem_init_stolen(struct drm_i915_private * dev_priv)358 int i915_gem_init_stolen(struct drm_i915_private *dev_priv)
359 {
360 resource_size_t reserved_base, stolen_top;
361 resource_size_t reserved_total, reserved_size;
362
363 mutex_init(&dev_priv->mm.stolen_lock);
364
365 if (intel_vgpu_active(dev_priv)) {
366 dev_notice(dev_priv->drm.dev,
367 "%s, disabling use of stolen memory\n",
368 "iGVT-g active");
369 return 0;
370 }
371
372 if (intel_vtd_active() && INTEL_GEN(dev_priv) < 8) {
373 dev_notice(dev_priv->drm.dev,
374 "%s, disabling use of stolen memory\n",
375 "DMAR active");
376 return 0;
377 }
378
379 if (resource_size(&intel_graphics_stolen_res) == 0)
380 return 0;
381
382 dev_priv->dsm = intel_graphics_stolen_res;
383
384 if (i915_adjust_stolen(dev_priv, &dev_priv->dsm))
385 return 0;
386
387 GEM_BUG_ON(dev_priv->dsm.start == 0);
388 GEM_BUG_ON(dev_priv->dsm.end <= dev_priv->dsm.start);
389
390 stolen_top = dev_priv->dsm.end + 1;
391 reserved_base = stolen_top;
392 reserved_size = 0;
393
394 switch (INTEL_GEN(dev_priv)) {
395 case 2:
396 case 3:
397 break;
398 case 4:
399 if (!IS_G4X(dev_priv))
400 break;
401 /* fall through */
402 case 5:
403 g4x_get_stolen_reserved(dev_priv,
404 &reserved_base, &reserved_size);
405 break;
406 case 6:
407 gen6_get_stolen_reserved(dev_priv,
408 &reserved_base, &reserved_size);
409 break;
410 case 7:
411 if (IS_VALLEYVIEW(dev_priv))
412 vlv_get_stolen_reserved(dev_priv,
413 &reserved_base, &reserved_size);
414 else
415 gen7_get_stolen_reserved(dev_priv,
416 &reserved_base, &reserved_size);
417 break;
418 case 8:
419 case 9:
420 case 10:
421 if (IS_LP(dev_priv))
422 chv_get_stolen_reserved(dev_priv,
423 &reserved_base, &reserved_size);
424 else
425 bdw_get_stolen_reserved(dev_priv,
426 &reserved_base, &reserved_size);
427 break;
428 case 11:
429 default:
430 icl_get_stolen_reserved(dev_priv, &reserved_base,
431 &reserved_size);
432 break;
433 }
434
435 /*
436 * Our expectation is that the reserved space is at the top of the
437 * stolen region and *never* at the bottom. If we see !reserved_base,
438 * it likely means we failed to read the registers correctly.
439 */
440 if (!reserved_base) {
441 DRM_ERROR("inconsistent reservation %pa + %pa; ignoring\n",
442 &reserved_base, &reserved_size);
443 reserved_base = stolen_top;
444 reserved_size = 0;
445 }
446
447 dev_priv->dsm_reserved =
448 (struct resource) DEFINE_RES_MEM(reserved_base, reserved_size);
449
450 if (!resource_contains(&dev_priv->dsm, &dev_priv->dsm_reserved)) {
451 DRM_ERROR("Stolen reserved area %pR outside stolen memory %pR\n",
452 &dev_priv->dsm_reserved, &dev_priv->dsm);
453 return 0;
454 }
455
456 /* It is possible for the reserved area to end before the end of stolen
457 * memory, so just consider the start. */
458 reserved_total = stolen_top - reserved_base;
459
460 DRM_DEBUG_DRIVER("Memory reserved for graphics device: %lluK, usable: %lluK\n",
461 (u64)resource_size(&dev_priv->dsm) >> 10,
462 ((u64)resource_size(&dev_priv->dsm) - reserved_total) >> 10);
463
464 dev_priv->stolen_usable_size =
465 resource_size(&dev_priv->dsm) - reserved_total;
466
467 /* Basic memrange allocator for stolen space. */
468 drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->stolen_usable_size);
469
470 return 0;
471 }
472
473 static struct sg_table *
i915_pages_create_for_stolen(struct drm_device * dev,resource_size_t offset,resource_size_t size)474 i915_pages_create_for_stolen(struct drm_device *dev,
475 resource_size_t offset, resource_size_t size)
476 {
477 struct drm_i915_private *dev_priv = to_i915(dev);
478 struct sg_table *st;
479 struct scatterlist *sg;
480
481 GEM_BUG_ON(range_overflows(offset, size, resource_size(&dev_priv->dsm)));
482
483 /* We hide that we have no struct page backing our stolen object
484 * by wrapping the contiguous physical allocation with a fake
485 * dma mapping in a single scatterlist.
486 */
487
488 st = kmalloc(sizeof(*st), GFP_KERNEL);
489 if (st == NULL)
490 return ERR_PTR(-ENOMEM);
491
492 if (sg_alloc_table(st, 1, GFP_KERNEL)) {
493 kfree(st);
494 return ERR_PTR(-ENOMEM);
495 }
496
497 sg = st->sgl;
498 sg->offset = 0;
499 sg->length = size;
500
501 sg_dma_address(sg) = (dma_addr_t)dev_priv->dsm.start + offset;
502 sg_dma_len(sg) = size;
503
504 return st;
505 }
506
i915_gem_object_get_pages_stolen(struct drm_i915_gem_object * obj)507 static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
508 {
509 struct sg_table *pages =
510 i915_pages_create_for_stolen(obj->base.dev,
511 obj->stolen->start,
512 obj->stolen->size);
513 if (IS_ERR(pages))
514 return PTR_ERR(pages);
515
516 __i915_gem_object_set_pages(obj, pages, obj->stolen->size);
517
518 return 0;
519 }
520
i915_gem_object_put_pages_stolen(struct drm_i915_gem_object * obj,struct sg_table * pages)521 static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj,
522 struct sg_table *pages)
523 {
524 /* Should only be called from i915_gem_object_release_stolen() */
525 sg_free_table(pages);
526 kfree(pages);
527 }
528
529 static void
i915_gem_object_release_stolen(struct drm_i915_gem_object * obj)530 i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
531 {
532 struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
533 struct drm_mm_node *stolen = fetch_and_zero(&obj->stolen);
534
535 GEM_BUG_ON(!stolen);
536
537 i915_gem_stolen_remove_node(dev_priv, stolen);
538 kfree(stolen);
539 }
540
541 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
542 .get_pages = i915_gem_object_get_pages_stolen,
543 .put_pages = i915_gem_object_put_pages_stolen,
544 .release = i915_gem_object_release_stolen,
545 };
546
547 static struct drm_i915_gem_object *
_i915_gem_object_create_stolen(struct drm_i915_private * dev_priv,struct drm_mm_node * stolen)548 _i915_gem_object_create_stolen(struct drm_i915_private *dev_priv,
549 struct drm_mm_node *stolen)
550 {
551 struct drm_i915_gem_object *obj;
552 unsigned int cache_level;
553
554 obj = i915_gem_object_alloc();
555 if (obj == NULL)
556 return NULL;
557
558 drm_gem_private_object_init(&dev_priv->drm, &obj->base, stolen->size);
559 i915_gem_object_init(obj, &i915_gem_object_stolen_ops);
560
561 obj->stolen = stolen;
562 obj->read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT;
563 cache_level = HAS_LLC(dev_priv) ? I915_CACHE_LLC : I915_CACHE_NONE;
564 i915_gem_object_set_cache_coherency(obj, cache_level);
565
566 if (i915_gem_object_pin_pages(obj))
567 goto cleanup;
568
569 return obj;
570
571 cleanup:
572 i915_gem_object_free(obj);
573 return NULL;
574 }
575
576 struct drm_i915_gem_object *
i915_gem_object_create_stolen(struct drm_i915_private * dev_priv,resource_size_t size)577 i915_gem_object_create_stolen(struct drm_i915_private *dev_priv,
578 resource_size_t size)
579 {
580 struct drm_i915_gem_object *obj;
581 struct drm_mm_node *stolen;
582 int ret;
583
584 if (!drm_mm_initialized(&dev_priv->mm.stolen))
585 return NULL;
586
587 if (size == 0)
588 return NULL;
589
590 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
591 if (!stolen)
592 return NULL;
593
594 ret = i915_gem_stolen_insert_node(dev_priv, stolen, size, 4096);
595 if (ret) {
596 kfree(stolen);
597 return NULL;
598 }
599
600 obj = _i915_gem_object_create_stolen(dev_priv, stolen);
601 if (obj)
602 return obj;
603
604 i915_gem_stolen_remove_node(dev_priv, stolen);
605 kfree(stolen);
606 return NULL;
607 }
608
609 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)610 i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private *dev_priv,
611 resource_size_t stolen_offset,
612 resource_size_t gtt_offset,
613 resource_size_t size)
614 {
615 struct i915_ggtt *ggtt = &dev_priv->ggtt;
616 struct drm_i915_gem_object *obj;
617 struct drm_mm_node *stolen;
618 struct i915_vma *vma;
619 int ret;
620
621 if (!drm_mm_initialized(&dev_priv->mm.stolen))
622 return NULL;
623
624 lockdep_assert_held(&dev_priv->drm.struct_mutex);
625
626 DRM_DEBUG_DRIVER("creating preallocated stolen object: stolen_offset=%pa, gtt_offset=%pa, size=%pa\n",
627 &stolen_offset, >t_offset, &size);
628
629 /* KISS and expect everything to be page-aligned */
630 if (WARN_ON(size == 0) ||
631 WARN_ON(!IS_ALIGNED(size, I915_GTT_PAGE_SIZE)) ||
632 WARN_ON(!IS_ALIGNED(stolen_offset, I915_GTT_MIN_ALIGNMENT)))
633 return NULL;
634
635 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
636 if (!stolen)
637 return NULL;
638
639 stolen->start = stolen_offset;
640 stolen->size = size;
641 mutex_lock(&dev_priv->mm.stolen_lock);
642 ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen);
643 mutex_unlock(&dev_priv->mm.stolen_lock);
644 if (ret) {
645 DRM_DEBUG_DRIVER("failed to allocate stolen space\n");
646 kfree(stolen);
647 return NULL;
648 }
649
650 obj = _i915_gem_object_create_stolen(dev_priv, stolen);
651 if (obj == NULL) {
652 DRM_DEBUG_DRIVER("failed to allocate stolen object\n");
653 i915_gem_stolen_remove_node(dev_priv, stolen);
654 kfree(stolen);
655 return NULL;
656 }
657
658 /* Some objects just need physical mem from stolen space */
659 if (gtt_offset == I915_GTT_OFFSET_NONE)
660 return obj;
661
662 ret = i915_gem_object_pin_pages(obj);
663 if (ret)
664 goto err;
665
666 vma = i915_vma_instance(obj, &ggtt->vm, NULL);
667 if (IS_ERR(vma)) {
668 ret = PTR_ERR(vma);
669 goto err_pages;
670 }
671
672 /* To simplify the initialisation sequence between KMS and GTT,
673 * we allow construction of the stolen object prior to
674 * setting up the GTT space. The actual reservation will occur
675 * later.
676 */
677 ret = i915_gem_gtt_reserve(&ggtt->vm, &vma->node,
678 size, gtt_offset, obj->cache_level,
679 0);
680 if (ret) {
681 DRM_DEBUG_DRIVER("failed to allocate stolen GTT space\n");
682 goto err_pages;
683 }
684
685 GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
686
687 vma->pages = obj->mm.pages;
688 vma->flags |= I915_VMA_GLOBAL_BIND;
689 __i915_vma_set_map_and_fenceable(vma);
690
691 mutex_lock(&ggtt->vm.mutex);
692 list_move_tail(&vma->vm_link, &ggtt->vm.bound_list);
693 mutex_unlock(&ggtt->vm.mutex);
694
695 GEM_BUG_ON(i915_gem_object_is_shrinkable(obj));
696 atomic_inc(&obj->bind_count);
697
698 return obj;
699
700 err_pages:
701 i915_gem_object_unpin_pages(obj);
702 err:
703 i915_gem_object_put(obj);
704 return NULL;
705 }
706
