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 "gem/i915_gem_region.h"
14 #include "i915_drv.h"
15 #include "i915_gem_stolen.h"
16 #include "i915_vgpu.h"
17
18 /*
19 * The BIOS typically reserves some of the system's memory for the exclusive
20 * use of the integrated graphics. This memory is no longer available for
21 * use by the OS and so the user finds that his system has less memory
22 * available than he put in. We refer to this memory as stolen.
23 *
24 * The BIOS will allocate its framebuffer from the stolen memory. Our
25 * goal is try to reuse that object for our own fbcon which must always
26 * be available for panics. Anything else we can reuse the stolen memory
27 * for is a boon.
28 */
29
i915_gem_stolen_insert_node_in_range(struct drm_i915_private * i915,struct drm_mm_node * node,u64 size,unsigned alignment,u64 start,u64 end)30 int i915_gem_stolen_insert_node_in_range(struct drm_i915_private *i915,
31 struct drm_mm_node *node, u64 size,
32 unsigned alignment, u64 start, u64 end)
33 {
34 int ret;
35
36 if (!drm_mm_initialized(&i915->mm.stolen))
37 return -ENODEV;
38
39 /* WaSkipStolenMemoryFirstPage:bdw+ */
40 if (INTEL_GEN(i915) >= 8 && start < 4096)
41 start = 4096;
42
43 mutex_lock(&i915->mm.stolen_lock);
44 ret = drm_mm_insert_node_in_range(&i915->mm.stolen, node,
45 size, alignment, 0,
46 start, end, DRM_MM_INSERT_BEST);
47 mutex_unlock(&i915->mm.stolen_lock);
48
49 return ret;
50 }
51
i915_gem_stolen_insert_node(struct drm_i915_private * i915,struct drm_mm_node * node,u64 size,unsigned alignment)52 int i915_gem_stolen_insert_node(struct drm_i915_private *i915,
53 struct drm_mm_node *node, u64 size,
54 unsigned alignment)
55 {
56 return i915_gem_stolen_insert_node_in_range(i915, node,
57 size, alignment,
58 I915_GEM_STOLEN_BIAS,
59 U64_MAX);
60 }
61
i915_gem_stolen_remove_node(struct drm_i915_private * i915,struct drm_mm_node * node)62 void i915_gem_stolen_remove_node(struct drm_i915_private *i915,
63 struct drm_mm_node *node)
64 {
65 mutex_lock(&i915->mm.stolen_lock);
66 drm_mm_remove_node(node);
67 mutex_unlock(&i915->mm.stolen_lock);
68 }
69
i915_adjust_stolen(struct drm_i915_private * i915,struct resource * dsm)70 static int i915_adjust_stolen(struct drm_i915_private *i915,
71 struct resource *dsm)
72 {
73 struct i915_ggtt *ggtt = &i915->ggtt;
74 struct intel_uncore *uncore = ggtt->vm.gt->uncore;
75 struct resource *r;
76
77 if (dsm->start == 0 || dsm->end <= dsm->start)
78 return -EINVAL;
79
80 /*
81 * TODO: We have yet too encounter the case where the GTT wasn't at the
82 * end of stolen. With that assumption we could simplify this.
83 */
84
85 /* Make sure we don't clobber the GTT if it's within stolen memory */
86 if (INTEL_GEN(i915) <= 4 &&
87 !IS_G33(i915) && !IS_PINEVIEW(i915) && !IS_G4X(i915)) {
88 struct resource stolen[2] = {*dsm, *dsm};
89 struct resource ggtt_res;
90 resource_size_t ggtt_start;
91
92 ggtt_start = intel_uncore_read(uncore, PGTBL_CTL);
93 if (IS_GEN(i915, 4))
94 ggtt_start = (ggtt_start & PGTBL_ADDRESS_LO_MASK) |
95 (ggtt_start & PGTBL_ADDRESS_HI_MASK) << 28;
96 else
97 ggtt_start &= PGTBL_ADDRESS_LO_MASK;
98
99 ggtt_res =
100 (struct resource) DEFINE_RES_MEM(ggtt_start,
101 ggtt_total_entries(ggtt) * 4);
102
103 if (ggtt_res.start >= stolen[0].start && ggtt_res.start < stolen[0].end)
104 stolen[0].end = ggtt_res.start;
105 if (ggtt_res.end > stolen[1].start && ggtt_res.end <= stolen[1].end)
106 stolen[1].start = ggtt_res.end;
107
108 /* Pick the larger of the two chunks */
109 if (resource_size(&stolen[0]) > resource_size(&stolen[1]))
110 *dsm = stolen[0];
111 else
112 *dsm = stolen[1];
113
114 if (stolen[0].start != stolen[1].start ||
115 stolen[0].end != stolen[1].end) {
116 drm_dbg(&i915->drm,
117 "GTT within stolen memory at %pR\n",
118 &ggtt_res);
119 drm_dbg(&i915->drm, "Stolen memory adjusted to %pR\n",
120 dsm);
121 }
122 }
123
124 /*
125 * Verify that nothing else uses this physical address. Stolen
126 * memory should be reserved by the BIOS and hidden from the
127 * kernel. So if the region is already marked as busy, something
128 * is seriously wrong.
129 */
130 r = devm_request_mem_region(i915->drm.dev, dsm->start,
131 resource_size(dsm),
132 "Graphics Stolen Memory");
133 if (r == NULL) {
134 /*
135 * One more attempt but this time requesting region from
136 * start + 1, as we have seen that this resolves the region
137 * conflict with the PCI Bus.
138 * This is a BIOS w/a: Some BIOS wrap stolen in the root
139 * PCI bus, but have an off-by-one error. Hence retry the
140 * reservation starting from 1 instead of 0.
141 * There's also BIOS with off-by-one on the other end.
142 */
143 r = devm_request_mem_region(i915->drm.dev, dsm->start + 1,
144 resource_size(dsm) - 2,
145 "Graphics Stolen Memory");
146 /*
147 * GEN3 firmware likes to smash pci bridges into the stolen
148 * range. Apparently this works.
149 */
150 if (!r && !IS_GEN(i915, 3)) {
151 drm_err(&i915->drm,
152 "conflict detected with stolen region: %pR\n",
153 dsm);
154
155 return -EBUSY;
156 }
157 }
158
159 return 0;
160 }
161
i915_gem_cleanup_stolen(struct drm_i915_private * i915)162 static void i915_gem_cleanup_stolen(struct drm_i915_private *i915)
163 {
164 if (!drm_mm_initialized(&i915->mm.stolen))
165 return;
166
167 drm_mm_takedown(&i915->mm.stolen);
168 }
169
g4x_get_stolen_reserved(struct drm_i915_private * i915,struct intel_uncore * uncore,resource_size_t * base,resource_size_t * size)170 static void g4x_get_stolen_reserved(struct drm_i915_private *i915,
171 struct intel_uncore *uncore,
172 resource_size_t *base,
173 resource_size_t *size)
174 {
175 u32 reg_val = intel_uncore_read(uncore,
176 IS_GM45(i915) ?
177 CTG_STOLEN_RESERVED :
178 ELK_STOLEN_RESERVED);
179 resource_size_t stolen_top = i915->dsm.end + 1;
180
181 drm_dbg(&i915->drm, "%s_STOLEN_RESERVED = %08x\n",
182 IS_GM45(i915) ? "CTG" : "ELK", reg_val);
183
184 if ((reg_val & G4X_STOLEN_RESERVED_ENABLE) == 0)
185 return;
186
187 /*
188 * Whether ILK really reuses the ELK register for this is unclear.
189 * Let's see if we catch anyone with this supposedly enabled on ILK.
190 */
191 drm_WARN(&i915->drm, IS_GEN(i915, 5),
192 "ILK stolen reserved found? 0x%08x\n",
193 reg_val);
194
195 if (!(reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK))
196 return;
197
198 *base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16;
199 drm_WARN_ON(&i915->drm,
200 (reg_val & G4X_STOLEN_RESERVED_ADDR1_MASK) < *base);
201
202 *size = stolen_top - *base;
203 }
204
gen6_get_stolen_reserved(struct drm_i915_private * i915,struct intel_uncore * uncore,resource_size_t * base,resource_size_t * size)205 static void gen6_get_stolen_reserved(struct drm_i915_private *i915,
206 struct intel_uncore *uncore,
207 resource_size_t *base,
208 resource_size_t *size)
209 {
210 u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED);
211
212 drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val);
213
214 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
215 return;
216
217 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
218
219 switch (reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK) {
220 case GEN6_STOLEN_RESERVED_1M:
221 *size = 1024 * 1024;
222 break;
223 case GEN6_STOLEN_RESERVED_512K:
224 *size = 512 * 1024;
225 break;
226 case GEN6_STOLEN_RESERVED_256K:
227 *size = 256 * 1024;
228 break;
229 case GEN6_STOLEN_RESERVED_128K:
230 *size = 128 * 1024;
231 break;
232 default:
233 *size = 1024 * 1024;
234 MISSING_CASE(reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK);
235 }
236 }
237
vlv_get_stolen_reserved(struct drm_i915_private * i915,struct intel_uncore * uncore,resource_size_t * base,resource_size_t * size)238 static void vlv_get_stolen_reserved(struct drm_i915_private *i915,
239 struct intel_uncore *uncore,
240 resource_size_t *base,
241 resource_size_t *size)
242 {
243 u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED);
244 resource_size_t stolen_top = i915->dsm.end + 1;
245
246 drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val);
247
248 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
249 return;
250
251 switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) {
252 default:
253 MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK);
254 fallthrough;
255 case GEN7_STOLEN_RESERVED_1M:
256 *size = 1024 * 1024;
257 break;
258 }
259
260 /*
261 * On vlv, the ADDR_MASK portion is left as 0 and HW deduces the
262 * reserved location as (top - size).
263 */
264 *base = stolen_top - *size;
265 }
266
gen7_get_stolen_reserved(struct drm_i915_private * i915,struct intel_uncore * uncore,resource_size_t * base,resource_size_t * size)267 static void gen7_get_stolen_reserved(struct drm_i915_private *i915,
268 struct intel_uncore *uncore,
269 resource_size_t *base,
270 resource_size_t *size)
271 {
272 u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED);
273
274 drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val);
275
276 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
277 return;
278
279 *base = reg_val & GEN7_STOLEN_RESERVED_ADDR_MASK;
280
281 switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) {
282 case GEN7_STOLEN_RESERVED_1M:
283 *size = 1024 * 1024;
284 break;
285 case GEN7_STOLEN_RESERVED_256K:
286 *size = 256 * 1024;
287 break;
288 default:
289 *size = 1024 * 1024;
290 MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK);
291 }
292 }
293
chv_get_stolen_reserved(struct drm_i915_private * i915,struct intel_uncore * uncore,resource_size_t * base,resource_size_t * size)294 static void chv_get_stolen_reserved(struct drm_i915_private *i915,
295 struct intel_uncore *uncore,
296 resource_size_t *base,
297 resource_size_t *size)
298 {
299 u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED);
300
301 drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val);
302
303 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
304 return;
305
306 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
307
308 switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) {
309 case GEN8_STOLEN_RESERVED_1M:
310 *size = 1024 * 1024;
311 break;
312 case GEN8_STOLEN_RESERVED_2M:
313 *size = 2 * 1024 * 1024;
314 break;
315 case GEN8_STOLEN_RESERVED_4M:
316 *size = 4 * 1024 * 1024;
317 break;
318 case GEN8_STOLEN_RESERVED_8M:
319 *size = 8 * 1024 * 1024;
320 break;
321 default:
322 *size = 8 * 1024 * 1024;
323 MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK);
324 }
325 }
326
bdw_get_stolen_reserved(struct drm_i915_private * i915,struct intel_uncore * uncore,resource_size_t * base,resource_size_t * size)327 static void bdw_get_stolen_reserved(struct drm_i915_private *i915,
328 struct intel_uncore *uncore,
329 resource_size_t *base,
330 resource_size_t *size)
331 {
332 u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED);
333 resource_size_t stolen_top = i915->dsm.end + 1;
334
335 drm_dbg(&i915->drm, "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 * i915,struct intel_uncore * uncore,resource_size_t * base,resource_size_t * size)347 static void icl_get_stolen_reserved(struct drm_i915_private *i915,
348 struct intel_uncore *uncore,
349 resource_size_t *base,
350 resource_size_t *size)
351 {
352 u64 reg_val = intel_uncore_read64(uncore, GEN6_STOLEN_RESERVED);
353
354 drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = 0x%016llx\n", reg_val);
355
356 *base = reg_val & GEN11_STOLEN_RESERVED_ADDR_MASK;
357
358 switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) {
359 case GEN8_STOLEN_RESERVED_1M:
360 *size = 1024 * 1024;
361 break;
362 case GEN8_STOLEN_RESERVED_2M:
363 *size = 2 * 1024 * 1024;
364 break;
365 case GEN8_STOLEN_RESERVED_4M:
366 *size = 4 * 1024 * 1024;
367 break;
368 case GEN8_STOLEN_RESERVED_8M:
369 *size = 8 * 1024 * 1024;
370 break;
371 default:
372 *size = 8 * 1024 * 1024;
373 MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK);
374 }
375 }
376
i915_gem_init_stolen(struct drm_i915_private * i915)377 static int i915_gem_init_stolen(struct drm_i915_private *i915)
378 {
379 struct intel_uncore *uncore = &i915->uncore;
380 resource_size_t reserved_base, stolen_top;
381 resource_size_t reserved_total, reserved_size;
382
383 mutex_init(&i915->mm.stolen_lock);
384
385 if (intel_vgpu_active(i915)) {
386 drm_notice(&i915->drm,
387 "%s, disabling use of stolen memory\n",
388 "iGVT-g active");
389 return 0;
390 }
391
392 if (intel_vtd_active() && INTEL_GEN(i915) < 8) {
393 drm_notice(&i915->drm,
394 "%s, disabling use of stolen memory\n",
395 "DMAR active");
396 return 0;
397 }
398
399 if (resource_size(&intel_graphics_stolen_res) == 0)
400 return 0;
401
402 i915->dsm = intel_graphics_stolen_res;
403
404 if (i915_adjust_stolen(i915, &i915->dsm))
405 return 0;
406
407 GEM_BUG_ON(i915->dsm.start == 0);
408 GEM_BUG_ON(i915->dsm.end <= i915->dsm.start);
409
410 stolen_top = i915->dsm.end + 1;
411 reserved_base = stolen_top;
412 reserved_size = 0;
413
414 switch (INTEL_GEN(i915)) {
415 case 2:
416 case 3:
417 break;
418 case 4:
419 if (!IS_G4X(i915))
420 break;
421 fallthrough;
422 case 5:
423 g4x_get_stolen_reserved(i915, uncore,
424 &reserved_base, &reserved_size);
425 break;
426 case 6:
427 gen6_get_stolen_reserved(i915, uncore,
428 &reserved_base, &reserved_size);
429 break;
430 case 7:
431 if (IS_VALLEYVIEW(i915))
432 vlv_get_stolen_reserved(i915, uncore,
433 &reserved_base, &reserved_size);
434 else
435 gen7_get_stolen_reserved(i915, uncore,
436 &reserved_base, &reserved_size);
437 break;
438 case 8:
439 case 9:
440 case 10:
441 if (IS_LP(i915))
442 chv_get_stolen_reserved(i915, uncore,
443 &reserved_base, &reserved_size);
444 else
445 bdw_get_stolen_reserved(i915, uncore,
446 &reserved_base, &reserved_size);
447 break;
448 default:
449 MISSING_CASE(INTEL_GEN(i915));
450 fallthrough;
451 case 11:
452 case 12:
453 icl_get_stolen_reserved(i915, uncore,
454 &reserved_base,
455 &reserved_size);
456 break;
457 }
458
459 /*
460 * Our expectation is that the reserved space is at the top of the
461 * stolen region and *never* at the bottom. If we see !reserved_base,
462 * it likely means we failed to read the registers correctly.
463 */
464 if (!reserved_base) {
465 drm_err(&i915->drm,
466 "inconsistent reservation %pa + %pa; ignoring\n",
467 &reserved_base, &reserved_size);
468 reserved_base = stolen_top;
469 reserved_size = 0;
470 }
471
472 i915->dsm_reserved =
473 (struct resource)DEFINE_RES_MEM(reserved_base, reserved_size);
474
475 if (!resource_contains(&i915->dsm, &i915->dsm_reserved)) {
476 drm_err(&i915->drm,
477 "Stolen reserved area %pR outside stolen memory %pR\n",
478 &i915->dsm_reserved, &i915->dsm);
479 return 0;
480 }
481
482 /* It is possible for the reserved area to end before the end of stolen
483 * memory, so just consider the start. */
484 reserved_total = stolen_top - reserved_base;
485
486 drm_dbg(&i915->drm,
487 "Memory reserved for graphics device: %lluK, usable: %lluK\n",
488 (u64)resource_size(&i915->dsm) >> 10,
489 ((u64)resource_size(&i915->dsm) - reserved_total) >> 10);
490
491 i915->stolen_usable_size =
492 resource_size(&i915->dsm) - reserved_total;
493
494 /* Basic memrange allocator for stolen space. */
495 drm_mm_init(&i915->mm.stolen, 0, i915->stolen_usable_size);
496
497 return 0;
498 }
499
500 static struct sg_table *
i915_pages_create_for_stolen(struct drm_device * dev,resource_size_t offset,resource_size_t size)501 i915_pages_create_for_stolen(struct drm_device *dev,
502 resource_size_t offset, resource_size_t size)
503 {
504 struct drm_i915_private *i915 = to_i915(dev);
505 struct sg_table *st;
506 struct scatterlist *sg;
507
508 GEM_BUG_ON(range_overflows(offset, size, resource_size(&i915->dsm)));
509
510 /* We hide that we have no struct page backing our stolen object
511 * by wrapping the contiguous physical allocation with a fake
512 * dma mapping in a single scatterlist.
513 */
514
515 st = kmalloc(sizeof(*st), GFP_KERNEL);
516 if (st == NULL)
517 return ERR_PTR(-ENOMEM);
518
519 if (sg_alloc_table(st, 1, GFP_KERNEL)) {
520 kfree(st);
521 return ERR_PTR(-ENOMEM);
522 }
523
524 sg = st->sgl;
525 sg->offset = 0;
526 sg->length = size;
527
528 sg_dma_address(sg) = (dma_addr_t)i915->dsm.start + offset;
529 sg_dma_len(sg) = size;
530
531 return st;
532 }
533
i915_gem_object_get_pages_stolen(struct drm_i915_gem_object * obj)534 static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
535 {
536 struct sg_table *pages =
537 i915_pages_create_for_stolen(obj->base.dev,
538 obj->stolen->start,
539 obj->stolen->size);
540 if (IS_ERR(pages))
541 return PTR_ERR(pages);
542
543 __i915_gem_object_set_pages(obj, pages, obj->stolen->size);
544
545 return 0;
546 }
547
i915_gem_object_put_pages_stolen(struct drm_i915_gem_object * obj,struct sg_table * pages)548 static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj,
549 struct sg_table *pages)
550 {
551 /* Should only be called from i915_gem_object_release_stolen() */
552 sg_free_table(pages);
553 kfree(pages);
554 }
555
556 static void
i915_gem_object_release_stolen(struct drm_i915_gem_object * obj)557 i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
558 {
559 struct drm_i915_private *i915 = to_i915(obj->base.dev);
560 struct drm_mm_node *stolen = fetch_and_zero(&obj->stolen);
561
562 GEM_BUG_ON(!stolen);
563
564 i915_gem_object_release_memory_region(obj);
565
566 i915_gem_stolen_remove_node(i915, stolen);
567 kfree(stolen);
568 }
569
570 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
571 .name = "i915_gem_object_stolen",
572 .get_pages = i915_gem_object_get_pages_stolen,
573 .put_pages = i915_gem_object_put_pages_stolen,
574 .release = i915_gem_object_release_stolen,
575 };
576
577 static struct drm_i915_gem_object *
__i915_gem_object_create_stolen(struct intel_memory_region * mem,struct drm_mm_node * stolen)578 __i915_gem_object_create_stolen(struct intel_memory_region *mem,
579 struct drm_mm_node *stolen)
580 {
581 static struct lock_class_key lock_class;
582 struct drm_i915_gem_object *obj;
583 unsigned int cache_level;
584 int err = -ENOMEM;
585
586 obj = i915_gem_object_alloc();
587 if (!obj)
588 goto err;
589
590 drm_gem_private_object_init(&mem->i915->drm, &obj->base, stolen->size);
591 i915_gem_object_init(obj, &i915_gem_object_stolen_ops, &lock_class);
592
593 obj->stolen = stolen;
594 obj->read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT;
595 cache_level = HAS_LLC(mem->i915) ? I915_CACHE_LLC : I915_CACHE_NONE;
596 i915_gem_object_set_cache_coherency(obj, cache_level);
597
598 err = i915_gem_object_pin_pages(obj);
599 if (err)
600 goto cleanup;
601
602 i915_gem_object_init_memory_region(obj, mem, 0);
603
604 return obj;
605
606 cleanup:
607 i915_gem_object_free(obj);
608 err:
609 return ERR_PTR(err);
610 }
611
612 static struct drm_i915_gem_object *
_i915_gem_object_create_stolen(struct intel_memory_region * mem,resource_size_t size,unsigned int flags)613 _i915_gem_object_create_stolen(struct intel_memory_region *mem,
614 resource_size_t size,
615 unsigned int flags)
616 {
617 struct drm_i915_private *i915 = mem->i915;
618 struct drm_i915_gem_object *obj;
619 struct drm_mm_node *stolen;
620 int ret;
621
622 if (!drm_mm_initialized(&i915->mm.stolen))
623 return ERR_PTR(-ENODEV);
624
625 if (size == 0)
626 return ERR_PTR(-EINVAL);
627
628 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
629 if (!stolen)
630 return ERR_PTR(-ENOMEM);
631
632 ret = i915_gem_stolen_insert_node(i915, stolen, size, 4096);
633 if (ret) {
634 obj = ERR_PTR(ret);
635 goto err_free;
636 }
637
638 obj = __i915_gem_object_create_stolen(mem, stolen);
639 if (IS_ERR(obj))
640 goto err_remove;
641
642 return obj;
643
644 err_remove:
645 i915_gem_stolen_remove_node(i915, stolen);
646 err_free:
647 kfree(stolen);
648 return obj;
649 }
650
651 struct drm_i915_gem_object *
i915_gem_object_create_stolen(struct drm_i915_private * i915,resource_size_t size)652 i915_gem_object_create_stolen(struct drm_i915_private *i915,
653 resource_size_t size)
654 {
655 return i915_gem_object_create_region(i915->mm.regions[INTEL_REGION_STOLEN],
656 size, I915_BO_ALLOC_CONTIGUOUS);
657 }
658
init_stolen(struct intel_memory_region * mem)659 static int init_stolen(struct intel_memory_region *mem)
660 {
661 intel_memory_region_set_name(mem, "stolen");
662
663 /*
664 * Initialise stolen early so that we may reserve preallocated
665 * objects for the BIOS to KMS transition.
666 */
667 return i915_gem_init_stolen(mem->i915);
668 }
669
release_stolen(struct intel_memory_region * mem)670 static void release_stolen(struct intel_memory_region *mem)
671 {
672 i915_gem_cleanup_stolen(mem->i915);
673 }
674
675 static const struct intel_memory_region_ops i915_region_stolen_ops = {
676 .init = init_stolen,
677 .release = release_stolen,
678 .create_object = _i915_gem_object_create_stolen,
679 };
680
i915_gem_stolen_setup(struct drm_i915_private * i915)681 struct intel_memory_region *i915_gem_stolen_setup(struct drm_i915_private *i915)
682 {
683 return intel_memory_region_create(i915,
684 intel_graphics_stolen_res.start,
685 resource_size(&intel_graphics_stolen_res),
686 PAGE_SIZE, 0,
687 &i915_region_stolen_ops);
688 }
689
690 struct drm_i915_gem_object *
i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private * i915,resource_size_t stolen_offset,resource_size_t size)691 i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private *i915,
692 resource_size_t stolen_offset,
693 resource_size_t size)
694 {
695 struct intel_memory_region *mem = i915->mm.regions[INTEL_REGION_STOLEN];
696 struct drm_i915_gem_object *obj;
697 struct drm_mm_node *stolen;
698 int ret;
699
700 if (!drm_mm_initialized(&i915->mm.stolen))
701 return ERR_PTR(-ENODEV);
702
703 drm_dbg(&i915->drm,
704 "creating preallocated stolen object: stolen_offset=%pa, size=%pa\n",
705 &stolen_offset, &size);
706
707 /* KISS and expect everything to be page-aligned */
708 if (GEM_WARN_ON(size == 0) ||
709 GEM_WARN_ON(!IS_ALIGNED(size, I915_GTT_PAGE_SIZE)) ||
710 GEM_WARN_ON(!IS_ALIGNED(stolen_offset, I915_GTT_MIN_ALIGNMENT)))
711 return ERR_PTR(-EINVAL);
712
713 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
714 if (!stolen)
715 return ERR_PTR(-ENOMEM);
716
717 stolen->start = stolen_offset;
718 stolen->size = size;
719 mutex_lock(&i915->mm.stolen_lock);
720 ret = drm_mm_reserve_node(&i915->mm.stolen, stolen);
721 mutex_unlock(&i915->mm.stolen_lock);
722 if (ret) {
723 obj = ERR_PTR(ret);
724 goto err_free;
725 }
726
727 obj = __i915_gem_object_create_stolen(mem, stolen);
728 if (IS_ERR(obj))
729 goto err_stolen;
730
731 i915_gem_object_set_cache_coherency(obj, I915_CACHE_NONE);
732 return obj;
733
734 err_stolen:
735 i915_gem_stolen_remove_node(i915, stolen);
736 err_free:
737 kfree(stolen);
738 return obj;
739 }
740
