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 mutex_lock(&dev_priv->mm.stolen_lock);
58 ret = drm_mm_insert_node_in_range(&dev_priv->mm.stolen, node,
59 size, alignment, 0,
60 start, end, DRM_MM_INSERT_BEST);
61 mutex_unlock(&dev_priv->mm.stolen_lock);
62
63 return ret;
64 }
65
i915_gem_stolen_insert_node(struct drm_i915_private * dev_priv,struct drm_mm_node * node,u64 size,unsigned alignment)66 int i915_gem_stolen_insert_node(struct drm_i915_private *dev_priv,
67 struct drm_mm_node *node, u64 size,
68 unsigned alignment)
69 {
70 return i915_gem_stolen_insert_node_in_range(dev_priv, node, size,
71 alignment, 0, U64_MAX);
72 }
73
i915_gem_stolen_remove_node(struct drm_i915_private * dev_priv,struct drm_mm_node * node)74 void i915_gem_stolen_remove_node(struct drm_i915_private *dev_priv,
75 struct drm_mm_node *node)
76 {
77 mutex_lock(&dev_priv->mm.stolen_lock);
78 drm_mm_remove_node(node);
79 mutex_unlock(&dev_priv->mm.stolen_lock);
80 }
81
82 #ifdef __DragonFly__
83 static
devm_request_mem_region(struct device * dev,resource_size_t start,resource_size_t n,const char * name)84 struct resource * devm_request_mem_region(struct device *dev,
85 resource_size_t start, resource_size_t n, const char *name)
86 {
87 static struct rman stolen_rman;
88 struct resource *res;
89
90 stolen_rman.rm_start = start;
91 stolen_rman.rm_end = start + n;
92 stolen_rman.rm_type = RMAN_ARRAY;
93 stolen_rman.rm_descr = name;
94 if (rman_init(&stolen_rman, -1))
95 return NULL;
96
97 if (rman_manage_region(&stolen_rman, stolen_rman.rm_start, stolen_rman.rm_end))
98 return NULL;
99
100 res = kmalloc(sizeof(*res), M_DRM, GFP_KERNEL);
101 return res;
102 }
103 #endif /* __DragonFly__ */
104
i915_stolen_to_dma(struct drm_i915_private * dev_priv)105 static dma_addr_t i915_stolen_to_dma(struct drm_i915_private *dev_priv)
106 {
107 struct pci_dev *pdev = dev_priv->drm.pdev;
108 struct i915_ggtt *ggtt = &dev_priv->ggtt;
109 struct resource *r;
110 dma_addr_t base;
111
112 /* Almost universally we can find the Graphics Base of Stolen Memory
113 * at register BSM (0x5c) in the igfx configuration space. On a few
114 * (desktop) machines this is also mirrored in the bridge device at
115 * different locations, or in the MCHBAR.
116 *
117 * On 865 we just check the TOUD register.
118 *
119 * On 830/845/85x the stolen memory base isn't available in any
120 * register. We need to calculate it as TOM-TSEG_SIZE-stolen_size.
121 *
122 */
123 base = 0;
124 if (INTEL_GEN(dev_priv) >= 3) {
125 u32 bsm;
126
127 pci_read_config_dword(pdev, INTEL_BSM, &bsm);
128
129 base = bsm & INTEL_BSM_MASK;
130 } else if (IS_I865G(dev_priv)) {
131 u32 tseg_size = 0;
132 u16 toud = 0;
133 u8 tmp;
134
135 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
136 I845_ESMRAMC, &tmp);
137
138 if (tmp & TSEG_ENABLE) {
139 switch (tmp & I845_TSEG_SIZE_MASK) {
140 case I845_TSEG_SIZE_512K:
141 tseg_size = KB(512);
142 break;
143 case I845_TSEG_SIZE_1M:
144 tseg_size = MB(1);
145 break;
146 }
147 }
148
149 pci_bus_read_config_word(pdev->bus, PCI_DEVFN(0, 0),
150 I865_TOUD, &toud);
151
152 base = (toud << 16) + tseg_size;
153 } else if (IS_I85X(dev_priv)) {
154 u32 tseg_size = 0;
155 u32 tom;
156 u8 tmp;
157
158 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
159 I85X_ESMRAMC, &tmp);
160
161 if (tmp & TSEG_ENABLE)
162 tseg_size = MB(1);
163
164 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 1),
165 I85X_DRB3, &tmp);
166 tom = tmp * MB(32);
167
168 base = tom - tseg_size - ggtt->stolen_size;
169 } else if (IS_I845G(dev_priv)) {
170 u32 tseg_size = 0;
171 u32 tom;
172 u8 tmp;
173
174 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
175 I845_ESMRAMC, &tmp);
176
177 if (tmp & TSEG_ENABLE) {
178 switch (tmp & I845_TSEG_SIZE_MASK) {
179 case I845_TSEG_SIZE_512K:
180 tseg_size = KB(512);
181 break;
182 case I845_TSEG_SIZE_1M:
183 tseg_size = MB(1);
184 break;
185 }
186 }
187
188 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
189 I830_DRB3, &tmp);
190 tom = tmp * MB(32);
191
192 base = tom - tseg_size - ggtt->stolen_size;
193 } else if (IS_I830(dev_priv)) {
194 u32 tseg_size = 0;
195 u32 tom;
196 u8 tmp;
197
198 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
199 I830_ESMRAMC, &tmp);
200
201 if (tmp & TSEG_ENABLE) {
202 if (tmp & I830_TSEG_SIZE_1M)
203 tseg_size = MB(1);
204 else
205 tseg_size = KB(512);
206 }
207
208 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
209 I830_DRB3, &tmp);
210 tom = tmp * MB(32);
211
212 base = tom - tseg_size - ggtt->stolen_size;
213 }
214
215 if (base == 0 || add_overflows(base, ggtt->stolen_size))
216 return 0;
217
218 /* make sure we don't clobber the GTT if it's within stolen memory */
219 if (INTEL_GEN(dev_priv) <= 4 &&
220 !IS_G33(dev_priv) && !IS_PINEVIEW(dev_priv) && !IS_G4X(dev_priv)) {
221 struct {
222 dma_addr_t start, end;
223 } stolen[2] = {
224 { .start = base, .end = base + ggtt->stolen_size, },
225 { .start = base, .end = base + ggtt->stolen_size, },
226 };
227 u64 ggtt_start, ggtt_end;
228
229 ggtt_start = I915_READ(PGTBL_CTL);
230 if (IS_GEN4(dev_priv))
231 ggtt_start = (ggtt_start & PGTBL_ADDRESS_LO_MASK) |
232 (ggtt_start & PGTBL_ADDRESS_HI_MASK) << 28;
233 else
234 ggtt_start &= PGTBL_ADDRESS_LO_MASK;
235 ggtt_end = ggtt_start + ggtt_total_entries(ggtt) * 4;
236
237 if (ggtt_start >= stolen[0].start && ggtt_start < stolen[0].end)
238 stolen[0].end = ggtt_start;
239 if (ggtt_end > stolen[1].start && ggtt_end <= stolen[1].end)
240 stolen[1].start = ggtt_end;
241
242 /* pick the larger of the two chunks */
243 if (stolen[0].end - stolen[0].start >
244 stolen[1].end - stolen[1].start) {
245 base = stolen[0].start;
246 ggtt->stolen_size = stolen[0].end - stolen[0].start;
247 } else {
248 base = stolen[1].start;
249 ggtt->stolen_size = stolen[1].end - stolen[1].start;
250 }
251
252 if (stolen[0].start != stolen[1].start ||
253 stolen[0].end != stolen[1].end) {
254 dma_addr_t end = base + ggtt->stolen_size - 1;
255
256 DRM_DEBUG_KMS("GTT within stolen memory at 0x%llx-0x%llx\n",
257 (unsigned long long)ggtt_start,
258 (unsigned long long)ggtt_end - 1);
259 DRM_DEBUG_KMS("Stolen memory adjusted to %pad - %pad\n",
260 &base, &end);
261 }
262 }
263
264
265 /* Verify that nothing else uses this physical address. Stolen
266 * memory should be reserved by the BIOS and hidden from the
267 * kernel. So if the region is already marked as busy, something
268 * is seriously wrong.
269 */
270 r = devm_request_mem_region(dev_priv->drm.dev, base, ggtt->stolen_size,
271 "Graphics Stolen Memory");
272 if (r == NULL) {
273 /*
274 * One more attempt but this time requesting region from
275 * base + 1, as we have seen that this resolves the region
276 * conflict with the PCI Bus.
277 * This is a BIOS w/a: Some BIOS wrap stolen in the root
278 * PCI bus, but have an off-by-one error. Hence retry the
279 * reservation starting from 1 instead of 0.
280 * There's also BIOS with off-by-one on the other end.
281 */
282 r = devm_request_mem_region(dev_priv->drm.dev, base + 1,
283 ggtt->stolen_size - 2,
284 "Graphics Stolen Memory");
285 /*
286 * GEN3 firmware likes to smash pci bridges into the stolen
287 * range. Apparently this works.
288 */
289 if (r == NULL && !IS_GEN3(dev_priv)) {
290 dma_addr_t end = base + ggtt->stolen_size;
291
292 DRM_ERROR("conflict detected with stolen region: [%pad - %pad]\n",
293 &base, &end);
294 base = 0;
295 }
296 }
297
298 return base;
299 }
300
i915_gem_cleanup_stolen(struct drm_device * dev)301 void i915_gem_cleanup_stolen(struct drm_device *dev)
302 {
303 struct drm_i915_private *dev_priv = to_i915(dev);
304
305 if (!drm_mm_initialized(&dev_priv->mm.stolen))
306 return;
307
308 drm_mm_takedown(&dev_priv->mm.stolen);
309 }
310
g4x_get_stolen_reserved(struct drm_i915_private * dev_priv,dma_addr_t * base,u32 * size)311 static void g4x_get_stolen_reserved(struct drm_i915_private *dev_priv,
312 dma_addr_t *base, u32 *size)
313 {
314 struct i915_ggtt *ggtt = &dev_priv->ggtt;
315 uint32_t reg_val = I915_READ(IS_GM45(dev_priv) ?
316 CTG_STOLEN_RESERVED :
317 ELK_STOLEN_RESERVED);
318 dma_addr_t stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size;
319
320 *base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16;
321
322 WARN_ON((reg_val & G4X_STOLEN_RESERVED_ADDR1_MASK) < *base);
323
324 /* On these platforms, the register doesn't have a size field, so the
325 * size is the distance between the base and the top of the stolen
326 * memory. We also have the genuine case where base is zero and there's
327 * nothing reserved. */
328 if (*base == 0)
329 *size = 0;
330 else
331 *size = stolen_top - *base;
332 }
333
gen6_get_stolen_reserved(struct drm_i915_private * dev_priv,dma_addr_t * base,u32 * size)334 static void gen6_get_stolen_reserved(struct drm_i915_private *dev_priv,
335 dma_addr_t *base, u32 *size)
336 {
337 uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
338
339 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
340
341 switch (reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK) {
342 case GEN6_STOLEN_RESERVED_1M:
343 *size = 1024 * 1024;
344 break;
345 case GEN6_STOLEN_RESERVED_512K:
346 *size = 512 * 1024;
347 break;
348 case GEN6_STOLEN_RESERVED_256K:
349 *size = 256 * 1024;
350 break;
351 case GEN6_STOLEN_RESERVED_128K:
352 *size = 128 * 1024;
353 break;
354 default:
355 *size = 1024 * 1024;
356 MISSING_CASE(reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK);
357 }
358 }
359
gen7_get_stolen_reserved(struct drm_i915_private * dev_priv,dma_addr_t * base,u32 * size)360 static void gen7_get_stolen_reserved(struct drm_i915_private *dev_priv,
361 dma_addr_t *base, u32 *size)
362 {
363 uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
364
365 *base = reg_val & GEN7_STOLEN_RESERVED_ADDR_MASK;
366
367 switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) {
368 case GEN7_STOLEN_RESERVED_1M:
369 *size = 1024 * 1024;
370 break;
371 case GEN7_STOLEN_RESERVED_256K:
372 *size = 256 * 1024;
373 break;
374 default:
375 *size = 1024 * 1024;
376 MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK);
377 }
378 }
379
chv_get_stolen_reserved(struct drm_i915_private * dev_priv,dma_addr_t * base,u32 * size)380 static void chv_get_stolen_reserved(struct drm_i915_private *dev_priv,
381 dma_addr_t *base, u32 *size)
382 {
383 uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
384
385 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
386
387 switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) {
388 case GEN8_STOLEN_RESERVED_1M:
389 *size = 1024 * 1024;
390 break;
391 case GEN8_STOLEN_RESERVED_2M:
392 *size = 2 * 1024 * 1024;
393 break;
394 case GEN8_STOLEN_RESERVED_4M:
395 *size = 4 * 1024 * 1024;
396 break;
397 case GEN8_STOLEN_RESERVED_8M:
398 *size = 8 * 1024 * 1024;
399 break;
400 default:
401 *size = 8 * 1024 * 1024;
402 MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK);
403 }
404 }
405
bdw_get_stolen_reserved(struct drm_i915_private * dev_priv,dma_addr_t * base,u32 * size)406 static void bdw_get_stolen_reserved(struct drm_i915_private *dev_priv,
407 dma_addr_t *base, u32 *size)
408 {
409 struct i915_ggtt *ggtt = &dev_priv->ggtt;
410 uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
411 dma_addr_t stolen_top;
412
413 stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size;
414
415 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
416
417 /* On these platforms, the register doesn't have a size field, so the
418 * size is the distance between the base and the top of the stolen
419 * memory. We also have the genuine case where base is zero and there's
420 * nothing reserved. */
421 if (*base == 0)
422 *size = 0;
423 else
424 *size = stolen_top - *base;
425 }
426
i915_gem_init_stolen(struct drm_i915_private * dev_priv)427 int i915_gem_init_stolen(struct drm_i915_private *dev_priv)
428 {
429 struct i915_ggtt *ggtt = &dev_priv->ggtt;
430 dma_addr_t reserved_base, stolen_top;
431 u32 reserved_total, reserved_size;
432 u32 stolen_usable_start;
433
434 lockinit(&dev_priv->mm.stolen_lock, "i915msl", 0, LK_CANRECURSE);
435
436 if (intel_vgpu_active(dev_priv)) {
437 DRM_INFO("iGVT-g active, disabling use of stolen memory\n");
438 return 0;
439 }
440
441 if (intel_vtd_active() && INTEL_GEN(dev_priv) < 8) {
442 DRM_INFO("DMAR active, disabling use of stolen memory\n");
443 return 0;
444 }
445
446 if (ggtt->stolen_size == 0)
447 return 0;
448
449 dev_priv->mm.stolen_base = i915_stolen_to_dma(dev_priv);
450 if (dev_priv->mm.stolen_base == 0)
451 return 0;
452
453 stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size;
454 reserved_base = 0;
455 reserved_size = 0;
456
457 switch (INTEL_INFO(dev_priv)->gen) {
458 case 2:
459 case 3:
460 break;
461 case 4:
462 if (IS_G4X(dev_priv))
463 g4x_get_stolen_reserved(dev_priv,
464 &reserved_base, &reserved_size);
465 break;
466 case 5:
467 /* Assume the gen6 maximum for the older platforms. */
468 reserved_size = 1024 * 1024;
469 reserved_base = stolen_top - reserved_size;
470 break;
471 case 6:
472 gen6_get_stolen_reserved(dev_priv,
473 &reserved_base, &reserved_size);
474 break;
475 case 7:
476 gen7_get_stolen_reserved(dev_priv,
477 &reserved_base, &reserved_size);
478 break;
479 default:
480 if (IS_LP(dev_priv))
481 chv_get_stolen_reserved(dev_priv,
482 &reserved_base, &reserved_size);
483 else
484 bdw_get_stolen_reserved(dev_priv,
485 &reserved_base, &reserved_size);
486 break;
487 }
488
489 /* It is possible for the reserved base to be zero, but the register
490 * field for size doesn't have a zero option. */
491 if (reserved_base == 0) {
492 reserved_size = 0;
493 reserved_base = stolen_top;
494 }
495
496 if (reserved_base < dev_priv->mm.stolen_base ||
497 reserved_base + reserved_size > stolen_top) {
498 dma_addr_t reserved_top = reserved_base + reserved_size;
499 DRM_DEBUG_KMS("Stolen reserved area [%pad - %pad] outside stolen memory [%pad - %pad]\n",
500 &reserved_base, &reserved_top,
501 &dev_priv->mm.stolen_base, &stolen_top);
502 return 0;
503 }
504
505 ggtt->stolen_reserved_base = reserved_base;
506 ggtt->stolen_reserved_size = reserved_size;
507
508 /* It is possible for the reserved area to end before the end of stolen
509 * memory, so just consider the start. */
510 reserved_total = stolen_top - reserved_base;
511
512 DRM_DEBUG_KMS("Memory reserved for graphics device: %uK, usable: %uK\n",
513 ggtt->stolen_size >> 10,
514 (ggtt->stolen_size - reserved_total) >> 10);
515
516 stolen_usable_start = 0;
517 /* WaSkipStolenMemoryFirstPage:bdw+ */
518 if (INTEL_GEN(dev_priv) >= 8)
519 stolen_usable_start = 4096;
520
521 ggtt->stolen_usable_size =
522 ggtt->stolen_size - reserved_total - stolen_usable_start;
523
524 /* Basic memrange allocator for stolen space. */
525 drm_mm_init(&dev_priv->mm.stolen, stolen_usable_start,
526 ggtt->stolen_usable_size);
527
528 return 0;
529 }
530
531 static struct sg_table *
i915_pages_create_for_stolen(struct drm_device * dev,u32 offset,u32 size)532 i915_pages_create_for_stolen(struct drm_device *dev,
533 u32 offset, u32 size)
534 {
535 struct drm_i915_private *dev_priv = to_i915(dev);
536 struct sg_table *st;
537 struct scatterlist *sg;
538
539 GEM_BUG_ON(range_overflows(offset, size, dev_priv->ggtt.stolen_size));
540
541 /* We hide that we have no struct page backing our stolen object
542 * by wrapping the contiguous physical allocation with a fake
543 * dma mapping in a single scatterlist.
544 */
545
546 st = kmalloc(sizeof(*st), M_DRM, GFP_KERNEL);
547 if (st == NULL)
548 return ERR_PTR(-ENOMEM);
549
550 if (sg_alloc_table(st, 1, GFP_KERNEL)) {
551 kfree(st);
552 return ERR_PTR(-ENOMEM);
553 }
554
555 sg = st->sgl;
556 sg->offset = 0;
557 sg->length = size;
558
559 sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset;
560 sg_dma_len(sg) = size;
561
562 return st;
563 }
564
i915_gem_object_get_pages_stolen(struct drm_i915_gem_object * obj)565 static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
566 {
567 struct sg_table *pages =
568 i915_pages_create_for_stolen(obj->base.dev,
569 obj->stolen->start,
570 obj->stolen->size);
571 if (IS_ERR(pages))
572 return PTR_ERR(pages);
573
574 __i915_gem_object_set_pages(obj, pages, obj->stolen->size);
575
576 return 0;
577 }
578
i915_gem_object_put_pages_stolen(struct drm_i915_gem_object * obj,struct sg_table * pages)579 static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj,
580 struct sg_table *pages)
581 {
582 /* Should only be called from i915_gem_object_release_stolen() */
583 sg_free_table(pages);
584 kfree(pages);
585 }
586
587 static void
i915_gem_object_release_stolen(struct drm_i915_gem_object * obj)588 i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
589 {
590 struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
591 struct drm_mm_node *stolen = fetch_and_zero(&obj->stolen);
592
593 GEM_BUG_ON(!stolen);
594
595 __i915_gem_object_unpin_pages(obj);
596
597 i915_gem_stolen_remove_node(dev_priv, stolen);
598 kfree(stolen);
599 }
600
601 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
602 .get_pages = i915_gem_object_get_pages_stolen,
603 .put_pages = i915_gem_object_put_pages_stolen,
604 .release = i915_gem_object_release_stolen,
605 };
606
607 static struct drm_i915_gem_object *
_i915_gem_object_create_stolen(struct drm_i915_private * dev_priv,struct drm_mm_node * stolen)608 _i915_gem_object_create_stolen(struct drm_i915_private *dev_priv,
609 struct drm_mm_node *stolen)
610 {
611 struct drm_i915_gem_object *obj;
612 unsigned int cache_level;
613
614 obj = i915_gem_object_alloc(dev_priv);
615 if (obj == NULL)
616 return NULL;
617
618 drm_gem_private_object_init(&dev_priv->drm, &obj->base, stolen->size);
619 i915_gem_object_init(obj, &i915_gem_object_stolen_ops);
620
621 obj->stolen = stolen;
622 obj->base.read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT;
623 cache_level = HAS_LLC(dev_priv) ? I915_CACHE_LLC : I915_CACHE_NONE;
624 i915_gem_object_set_cache_coherency(obj, cache_level);
625
626 if (i915_gem_object_pin_pages(obj))
627 goto cleanup;
628
629 return obj;
630
631 cleanup:
632 i915_gem_object_free(obj);
633 return NULL;
634 }
635
636 struct drm_i915_gem_object *
i915_gem_object_create_stolen(struct drm_i915_private * dev_priv,u32 size)637 i915_gem_object_create_stolen(struct drm_i915_private *dev_priv, u32 size)
638 {
639 struct drm_i915_gem_object *obj;
640 struct drm_mm_node *stolen;
641 int ret;
642
643 if (!drm_mm_initialized(&dev_priv->mm.stolen))
644 return NULL;
645
646 if (size == 0)
647 return NULL;
648
649 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
650 if (!stolen)
651 return NULL;
652
653 ret = i915_gem_stolen_insert_node(dev_priv, stolen, size, 4096);
654 if (ret) {
655 kfree(stolen);
656 return NULL;
657 }
658
659 obj = _i915_gem_object_create_stolen(dev_priv, stolen);
660 if (obj)
661 return obj;
662
663 i915_gem_stolen_remove_node(dev_priv, stolen);
664 kfree(stolen);
665 return NULL;
666 }
667
668 struct drm_i915_gem_object *
i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private * dev_priv,u32 stolen_offset,u32 gtt_offset,u32 size)669 i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private *dev_priv,
670 u32 stolen_offset,
671 u32 gtt_offset,
672 u32 size)
673 {
674 struct i915_ggtt *ggtt = &dev_priv->ggtt;
675 struct drm_i915_gem_object *obj;
676 struct drm_mm_node *stolen;
677 struct i915_vma *vma;
678 int ret;
679
680 if (!drm_mm_initialized(&dev_priv->mm.stolen))
681 return NULL;
682
683 lockdep_assert_held(&dev_priv->drm.struct_mutex);
684
685 DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n",
686 stolen_offset, gtt_offset, size);
687
688 /* KISS and expect everything to be page-aligned */
689 if (WARN_ON(size == 0) ||
690 WARN_ON(!IS_ALIGNED(size, I915_GTT_PAGE_SIZE)) ||
691 WARN_ON(!IS_ALIGNED(stolen_offset, I915_GTT_MIN_ALIGNMENT)))
692 return NULL;
693
694 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
695 if (!stolen)
696 return NULL;
697
698 stolen->start = stolen_offset;
699 stolen->size = size;
700 mutex_lock(&dev_priv->mm.stolen_lock);
701 ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen);
702 mutex_unlock(&dev_priv->mm.stolen_lock);
703 if (ret) {
704 DRM_DEBUG_KMS("failed to allocate stolen space\n");
705 kfree(stolen);
706 return NULL;
707 }
708
709 obj = _i915_gem_object_create_stolen(dev_priv, stolen);
710 if (obj == NULL) {
711 DRM_DEBUG_KMS("failed to allocate stolen object\n");
712 i915_gem_stolen_remove_node(dev_priv, stolen);
713 kfree(stolen);
714 return NULL;
715 }
716
717 /* Some objects just need physical mem from stolen space */
718 if (gtt_offset == I915_GTT_OFFSET_NONE)
719 return obj;
720
721 ret = i915_gem_object_pin_pages(obj);
722 if (ret)
723 goto err;
724
725 vma = i915_vma_instance(obj, &ggtt->base, NULL);
726 if (IS_ERR(vma)) {
727 ret = PTR_ERR(vma);
728 goto err_pages;
729 }
730
731 /* To simplify the initialisation sequence between KMS and GTT,
732 * we allow construction of the stolen object prior to
733 * setting up the GTT space. The actual reservation will occur
734 * later.
735 */
736 ret = i915_gem_gtt_reserve(&ggtt->base, &vma->node,
737 size, gtt_offset, obj->cache_level,
738 0);
739 if (ret) {
740 DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
741 goto err_pages;
742 }
743
744 GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
745
746 vma->pages = obj->mm.pages;
747 vma->flags |= I915_VMA_GLOBAL_BIND;
748 __i915_vma_set_map_and_fenceable(vma);
749 list_move_tail(&vma->vm_link, &ggtt->base.inactive_list);
750
751 lockmgr(&dev_priv->mm.obj_lock, LK_EXCLUSIVE);
752 list_move_tail(&obj->mm.link, &dev_priv->mm.bound_list);
753 obj->bind_count++;
754 lockmgr(&dev_priv->mm.obj_lock, LK_RELEASE);
755
756 return obj;
757
758 err_pages:
759 i915_gem_object_unpin_pages(obj);
760 err:
761 i915_gem_object_put(obj);
762 return NULL;
763 }
764