2 * Copyright © 2008-2012 Intel Corporation
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:
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
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
24 * Eric Anholt <eric@anholt.net>
25 * Chris Wilson <chris@chris-wilson.co.uk>
30 #include <drm/i915_drm.h>
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.
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
45 static unsigned long i915_stolen_to_physical(struct drm_device
*dev
)
47 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
50 /* Almost universally we can find the Graphics Base of Stolen Memory
51 * at offset 0x5c in the igfx configuration space. On a few (desktop)
52 * machines this is also mirrored in the bridge device at different
53 * locations, or in the MCHBAR. On gen2, the layout is again slightly
54 * different with the Graphics Segment immediately following Top of
55 * Memory (or Top of Usable DRAM). Note it appears that TOUD is only
56 * reported by 865g, so we just use the top of memory as determined
59 * XXX However gen2 requires an unavailable symbol.
62 if (INTEL_INFO(dev
)->gen
>= 3) {
63 /* Read Graphics Base of Stolen Memory directly */
64 pci_read_config_dword(dev
->pdev
, 0x5c, &base
);
65 base
&= ~((1<<20) - 1);
68 /* Stolen is immediately above Top of Memory */
69 base
= max_low_pfn_mapped
<< PAGE_SHIFT
;
76 /* make sure we don't clobber the GTT if it's within stolen memory */
77 if (INTEL_INFO(dev
)->gen
<= 4 && !IS_G33(dev
) && !IS_G4X(dev
)) {
81 { .start
= base
, .end
= base
+ dev_priv
->gtt
.stolen_size
, },
82 { .start
= base
, .end
= base
+ dev_priv
->gtt
.stolen_size
, },
84 u64 gtt_start
, gtt_end
;
86 gtt_start
= I915_READ(PGTBL_CTL
);
88 gtt_start
= (gtt_start
& PGTBL_ADDRESS_LO_MASK
) |
89 (gtt_start
& PGTBL_ADDRESS_HI_MASK
) << 28;
91 gtt_start
&= PGTBL_ADDRESS_LO_MASK
;
92 gtt_end
= gtt_start
+ gtt_total_entries(dev_priv
->gtt
) * 4;
94 if (gtt_start
>= stolen
[0].start
&& gtt_start
< stolen
[0].end
)
95 stolen
[0].end
= gtt_start
;
96 if (gtt_end
> stolen
[1].start
&& gtt_end
<= stolen
[1].end
)
97 stolen
[1].start
= gtt_end
;
99 /* pick the larger of the two chunks */
100 if (stolen
[0].end
- stolen
[0].start
>
101 stolen
[1].end
- stolen
[1].start
) {
102 base
= stolen
[0].start
;
103 dev_priv
->gtt
.stolen_size
= stolen
[0].end
- stolen
[0].start
;
105 base
= stolen
[1].start
;
106 dev_priv
->gtt
.stolen_size
= stolen
[1].end
- stolen
[1].start
;
109 if (stolen
[0].start
!= stolen
[1].start
||
110 stolen
[0].end
!= stolen
[1].end
) {
111 DRM_DEBUG_KMS("GTT within stolen memory at 0x%llx-0x%llx\n",
112 (unsigned long long) gtt_start
,
113 (unsigned long long) gtt_end
- 1);
114 DRM_DEBUG_KMS("Stolen memory adjusted to 0x%x-0x%x\n",
115 base
, base
+ (u32
) dev_priv
->gtt
.stolen_size
- 1);
120 /* Verify that nothing else uses this physical address. Stolen
121 * memory should be reserved by the BIOS and hidden from the
122 * kernel. So if the region is already marked as busy, something
123 * is seriously wrong.
126 r
= devm_request_mem_region(dev
->dev
, base
, dev_priv
->gtt
.stolen_size
,
127 "Graphics Stolen Memory");
130 * One more attempt but this time requesting region from
131 * base + 1, as we have seen that this resolves the region
132 * conflict with the PCI Bus.
133 * This is a BIOS w/a: Some BIOS wrap stolen in the root
134 * PCI bus, but have an off-by-one error. Hence retry the
135 * reservation starting from 1 instead of 0.
137 r
= devm_request_mem_region(dev
->dev
, base
+ 1,
138 dev_priv
->gtt
.stolen_size
- 1,
139 "Graphics Stolen Memory");
141 DRM_ERROR("conflict detected with stolen region: [0x%08x - 0x%08x]\n",
142 base
, base
+ (uint32_t)dev_priv
->gtt
.stolen_size
);
151 static int i915_setup_compression(struct drm_device
*dev
, int size
)
153 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
154 struct drm_mm_node
*compressed_fb
, *compressed_llb
= NULL
;
157 compressed_fb
= kzalloc(sizeof(*compressed_fb
), GFP_KERNEL
);
161 /* Try to over-allocate to reduce reallocations and fragmentation */
162 ret
= drm_mm_insert_node(&dev_priv
->mm
.stolen
, compressed_fb
,
163 size
<<= 1, 4096, DRM_MM_SEARCH_DEFAULT
);
165 ret
= drm_mm_insert_node(&dev_priv
->mm
.stolen
, compressed_fb
,
167 DRM_MM_SEARCH_DEFAULT
);
171 if (HAS_PCH_SPLIT(dev
))
172 I915_WRITE(ILK_DPFC_CB_BASE
, compressed_fb
->start
);
173 else if (IS_GM45(dev
)) {
174 I915_WRITE(DPFC_CB_BASE
, compressed_fb
->start
);
176 compressed_llb
= kzalloc(sizeof(*compressed_llb
), GFP_KERNEL
);
180 ret
= drm_mm_insert_node(&dev_priv
->mm
.stolen
, compressed_llb
,
181 4096, 4096, DRM_MM_SEARCH_DEFAULT
);
185 dev_priv
->fbc
.compressed_llb
= compressed_llb
;
187 I915_WRITE(FBC_CFB_BASE
,
188 dev_priv
->mm
.stolen_base
+ compressed_fb
->start
);
189 I915_WRITE(FBC_LL_BASE
,
190 dev_priv
->mm
.stolen_base
+ compressed_llb
->start
);
193 dev_priv
->fbc
.compressed_fb
= compressed_fb
;
194 dev_priv
->fbc
.size
= size
;
196 DRM_DEBUG_KMS("reserved %d bytes of contiguous stolen space for FBC\n",
202 kfree(compressed_llb
);
203 drm_mm_remove_node(compressed_fb
);
205 kfree(compressed_fb
);
206 pr_info_once("drm: not enough stolen space for compressed buffer (need %d more bytes), disabling. Hint: you may be able to increase stolen memory size in the BIOS to avoid this.\n", size
);
210 int i915_gem_stolen_setup_compression(struct drm_device
*dev
, int size
)
212 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
214 if (!drm_mm_initialized(&dev_priv
->mm
.stolen
))
217 if (size
< dev_priv
->fbc
.size
)
220 /* Release any current block */
221 i915_gem_stolen_cleanup_compression(dev
);
223 return i915_setup_compression(dev
, size
);
226 void i915_gem_stolen_cleanup_compression(struct drm_device
*dev
)
228 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
230 if (dev_priv
->fbc
.size
== 0)
233 if (dev_priv
->fbc
.compressed_fb
) {
234 drm_mm_remove_node(dev_priv
->fbc
.compressed_fb
);
235 kfree(dev_priv
->fbc
.compressed_fb
);
238 if (dev_priv
->fbc
.compressed_llb
) {
239 drm_mm_remove_node(dev_priv
->fbc
.compressed_llb
);
240 kfree(dev_priv
->fbc
.compressed_llb
);
243 dev_priv
->fbc
.size
= 0;
246 void i915_gem_cleanup_stolen(struct drm_device
*dev
)
248 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
250 if (!drm_mm_initialized(&dev_priv
->mm
.stolen
))
253 i915_gem_stolen_cleanup_compression(dev
);
254 drm_mm_takedown(&dev_priv
->mm
.stolen
);
257 int i915_gem_init_stolen(struct drm_device
*dev
)
259 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
260 int bios_reserved
= 0;
262 #ifdef CONFIG_INTEL_IOMMU
263 if (intel_iommu_gfx_mapped
&& INTEL_INFO(dev
)->gen
< 8) {
264 DRM_INFO("DMAR active, disabling use of stolen memory\n");
269 if (dev_priv
->gtt
.stolen_size
== 0)
272 dev_priv
->mm
.stolen_base
= i915_stolen_to_physical(dev
);
273 if (dev_priv
->mm
.stolen_base
== 0)
276 DRM_DEBUG_KMS("found %zd bytes of stolen memory at %08lx\n",
277 dev_priv
->gtt
.stolen_size
, dev_priv
->mm
.stolen_base
);
279 if (IS_VALLEYVIEW(dev
))
280 bios_reserved
= 1024*1024; /* top 1M on VLV/BYT */
282 if (WARN_ON(bios_reserved
> dev_priv
->gtt
.stolen_size
))
285 /* Basic memrange allocator for stolen space */
286 drm_mm_init(&dev_priv
->mm
.stolen
, 0, dev_priv
->gtt
.stolen_size
-
293 static struct sg_table
*
294 i915_pages_create_for_stolen(struct drm_device
*dev
,
295 u32 offset
, u32 size
)
297 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
299 struct scatterlist
*sg
;
301 DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset
, size
);
302 BUG_ON(offset
> dev_priv
->gtt
.stolen_size
- size
);
304 /* We hide that we have no struct page backing our stolen object
305 * by wrapping the contiguous physical allocation with a fake
306 * dma mapping in a single scatterlist.
309 st
= kmalloc(sizeof(*st
), GFP_KERNEL
);
313 if (sg_alloc_table(st
, 1, GFP_KERNEL
)) {
322 sg_dma_address(sg
) = (dma_addr_t
)dev_priv
->mm
.stolen_base
+ offset
;
323 sg_dma_len(sg
) = size
;
329 static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object
*obj
)
335 static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object
*obj
)
338 /* Should only be called during free */
339 sg_free_table(obj
->pages
);
346 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops
= {
347 .get_pages
= i915_gem_object_get_pages_stolen
,
348 .put_pages
= i915_gem_object_put_pages_stolen
,
351 static struct drm_i915_gem_object
*
352 _i915_gem_object_create_stolen(struct drm_device
*dev
,
353 struct drm_mm_node
*stolen
)
355 struct drm_i915_gem_object
*obj
;
358 obj
= i915_gem_object_alloc(dev
);
365 drm_gem_private_object_init(dev
, &obj
->base
, stolen
->size
);
366 i915_gem_object_init(obj
, &i915_gem_object_stolen_ops
);
369 obj
->pages
= i915_pages_create_for_stolen(dev
,
370 stolen
->start
, stolen
->size
);
374 if (obj
->pages
== NULL
)
377 obj
->has_dma_mapping
= true;
378 i915_gem_object_pin_pages(obj
);
379 obj
->stolen
= stolen
;
381 obj
->base
.read_domains
= I915_GEM_DOMAIN_CPU
| I915_GEM_DOMAIN_GTT
;
382 obj
->cache_level
= HAS_LLC(dev
) ? I915_CACHE_LLC
: I915_CACHE_NONE
;
387 i915_gem_object_free(obj
);
391 struct drm_i915_gem_object
*
392 i915_gem_object_create_stolen(struct drm_device
*dev
, u32 size
)
394 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
395 struct drm_i915_gem_object
*obj
;
396 struct drm_mm_node
*stolen
;
399 if (!drm_mm_initialized(&dev_priv
->mm
.stolen
))
402 DRM_DEBUG_KMS("creating stolen object: size=%x\n", size
);
406 stolen
= kzalloc(sizeof(*stolen
), GFP_KERNEL
);
410 ret
= drm_mm_insert_node(&dev_priv
->mm
.stolen
, stolen
, size
,
411 4096, DRM_MM_SEARCH_DEFAULT
);
417 obj
= _i915_gem_object_create_stolen(dev
, stolen
);
421 drm_mm_remove_node(stolen
);
426 struct drm_i915_gem_object
*
427 i915_gem_object_create_stolen_for_preallocated(struct drm_device
*dev
,
432 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
433 struct i915_address_space
*ggtt
= &dev_priv
->gtt
.base
;
434 struct drm_i915_gem_object
*obj
;
435 struct drm_mm_node
*stolen
;
436 struct i915_vma
*vma
;
439 if (!drm_mm_initialized(&dev_priv
->mm
.stolen
))
442 DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n",
443 stolen_offset
, gtt_offset
, size
);
445 /* KISS and expect everything to be page-aligned */
446 BUG_ON(stolen_offset
& 4095);
449 if (WARN_ON(size
== 0))
452 stolen
= kzalloc(sizeof(*stolen
), GFP_KERNEL
);
456 stolen
->start
= stolen_offset
;
458 ret
= drm_mm_reserve_node(&dev_priv
->mm
.stolen
, stolen
);
460 DRM_DEBUG_KMS("failed to allocate stolen space\n");
465 obj
= _i915_gem_object_create_stolen(dev
, stolen
);
467 DRM_DEBUG_KMS("failed to allocate stolen object\n");
468 drm_mm_remove_node(stolen
);
473 /* Some objects just need physical mem from stolen space */
474 if (gtt_offset
== I915_GTT_OFFSET_NONE
)
477 vma
= i915_gem_obj_lookup_or_create_vma(obj
, ggtt
);
483 /* To simplify the initialisation sequence between KMS and GTT,
484 * we allow construction of the stolen object prior to
485 * setting up the GTT space. The actual reservation will occur
488 vma
->node
.start
= gtt_offset
;
489 vma
->node
.size
= size
;
490 if (drm_mm_initialized(&ggtt
->mm
)) {
491 ret
= drm_mm_reserve_node(&ggtt
->mm
, &vma
->node
);
493 DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
498 obj
->has_global_gtt_mapping
= 1;
500 list_add_tail(&obj
->global_list
, &dev_priv
->mm
.bound_list
);
501 list_add_tail(&vma
->mm_list
, &ggtt
->inactive_list
);
502 i915_gem_object_pin_pages(obj
);
507 i915_gem_vma_destroy(vma
);
509 drm_mm_remove_node(stolen
);
511 drm_gem_object_unreference(&obj
->base
);
516 i915_gem_object_release_stolen(struct drm_i915_gem_object
*obj
)
519 drm_mm_remove_node(obj
->stolen
);