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
;
51 /* Almost universally we can find the Graphics Base of Stolen Memory
52 * at offset 0x5c in the igfx configuration space. On a few (desktop)
53 * machines this is also mirrored in the bridge device at different
54 * locations, or in the MCHBAR. On gen2, the layout is again slightly
55 * different with the Graphics Segment immediately following Top of
56 * Memory (or Top of Usable DRAM). Note it appears that TOUD is only
57 * reported by 865g, so we just use the top of memory as determined
60 * XXX However gen2 requires an unavailable symbol.
63 if (INTEL_INFO(dev
)->gen
>= 3) {
64 /* Read Graphics Base of Stolen Memory directly */
65 pci_read_config_dword(dev
->pdev
, 0x5c, &base
);
66 base
&= ~((1<<20) - 1);
69 /* Stolen is immediately above Top of Memory */
70 base
= max_low_pfn_mapped
<< PAGE_SHIFT
;
77 /* Verify that nothing else uses this physical address. Stolen
78 * memory should be reserved by the BIOS and hidden from the
79 * kernel. So if the region is already marked as busy, something
82 r
= devm_request_mem_region(dev
->dev
, base
, dev_priv
->gtt
.stolen_size
,
83 "Graphics Stolen Memory");
85 DRM_ERROR("conflict detected with stolen region: [0x%08x - 0x%08x]\n",
86 base
, base
+ (uint32_t)dev_priv
->gtt
.stolen_size
);
93 static int i915_setup_compression(struct drm_device
*dev
, int size
)
95 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
96 struct drm_mm_node
*compressed_fb
, *uninitialized_var(compressed_llb
);
98 /* Try to over-allocate to reduce reallocations and fragmentation */
99 compressed_fb
= drm_mm_search_free(&dev_priv
->mm
.stolen
,
100 size
<<= 1, 4096, 0);
102 compressed_fb
= drm_mm_search_free(&dev_priv
->mm
.stolen
,
103 size
>>= 1, 4096, 0);
105 compressed_fb
= drm_mm_get_block(compressed_fb
, size
, 4096);
109 if (HAS_PCH_SPLIT(dev
))
110 I915_WRITE(ILK_DPFC_CB_BASE
, compressed_fb
->start
);
111 else if (IS_GM45(dev
)) {
112 I915_WRITE(DPFC_CB_BASE
, compressed_fb
->start
);
114 compressed_llb
= drm_mm_search_free(&dev_priv
->mm
.stolen
,
117 compressed_llb
= drm_mm_get_block(compressed_llb
,
122 dev_priv
->fbc
.compressed_llb
= compressed_llb
;
124 I915_WRITE(FBC_CFB_BASE
,
125 dev_priv
->mm
.stolen_base
+ compressed_fb
->start
);
126 I915_WRITE(FBC_LL_BASE
,
127 dev_priv
->mm
.stolen_base
+ compressed_llb
->start
);
130 dev_priv
->fbc
.compressed_fb
= compressed_fb
;
131 dev_priv
->fbc
.size
= size
;
133 DRM_DEBUG_KMS("reserved %d bytes of contiguous stolen space for FBC\n",
139 drm_mm_put_block(compressed_fb
);
141 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
);
145 int i915_gem_stolen_setup_compression(struct drm_device
*dev
, int size
)
147 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
149 if (!drm_mm_initialized(&dev_priv
->mm
.stolen
))
152 if (size
< dev_priv
->fbc
.size
)
155 /* Release any current block */
156 i915_gem_stolen_cleanup_compression(dev
);
158 return i915_setup_compression(dev
, size
);
161 void i915_gem_stolen_cleanup_compression(struct drm_device
*dev
)
163 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
165 if (dev_priv
->fbc
.size
== 0)
168 if (dev_priv
->fbc
.compressed_fb
)
169 drm_mm_put_block(dev_priv
->fbc
.compressed_fb
);
171 if (dev_priv
->fbc
.compressed_llb
)
172 drm_mm_put_block(dev_priv
->fbc
.compressed_llb
);
174 dev_priv
->fbc
.size
= 0;
177 void i915_gem_cleanup_stolen(struct drm_device
*dev
)
179 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
181 if (!drm_mm_initialized(&dev_priv
->mm
.stolen
))
184 i915_gem_stolen_cleanup_compression(dev
);
185 drm_mm_takedown(&dev_priv
->mm
.stolen
);
188 int i915_gem_init_stolen(struct drm_device
*dev
)
190 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
191 int bios_reserved
= 0;
193 dev_priv
->mm
.stolen_base
= i915_stolen_to_physical(dev
);
194 if (dev_priv
->mm
.stolen_base
== 0)
197 DRM_DEBUG_KMS("found %zd bytes of stolen memory at %08lx\n",
198 dev_priv
->gtt
.stolen_size
, dev_priv
->mm
.stolen_base
);
200 if (IS_VALLEYVIEW(dev
))
201 bios_reserved
= 1024*1024; /* top 1M on VLV/BYT */
203 if (WARN_ON(bios_reserved
> dev_priv
->gtt
.stolen_size
))
206 /* Basic memrange allocator for stolen space */
207 drm_mm_init(&dev_priv
->mm
.stolen
, 0, dev_priv
->gtt
.stolen_size
-
213 static struct sg_table
*
214 i915_pages_create_for_stolen(struct drm_device
*dev
,
215 u32 offset
, u32 size
)
217 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
219 struct scatterlist
*sg
;
221 DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset
, size
);
222 BUG_ON(offset
> dev_priv
->gtt
.stolen_size
- size
);
224 /* We hide that we have no struct page backing our stolen object
225 * by wrapping the contiguous physical allocation with a fake
226 * dma mapping in a single scatterlist.
229 st
= kmalloc(sizeof(*st
), GFP_KERNEL
);
233 if (sg_alloc_table(st
, 1, GFP_KERNEL
)) {
242 sg_dma_address(sg
) = (dma_addr_t
)dev_priv
->mm
.stolen_base
+ offset
;
243 sg_dma_len(sg
) = size
;
248 static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object
*obj
)
254 static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object
*obj
)
256 /* Should only be called during free */
257 sg_free_table(obj
->pages
);
261 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops
= {
262 .get_pages
= i915_gem_object_get_pages_stolen
,
263 .put_pages
= i915_gem_object_put_pages_stolen
,
266 static struct drm_i915_gem_object
*
267 _i915_gem_object_create_stolen(struct drm_device
*dev
,
268 struct drm_mm_node
*stolen
)
270 struct drm_i915_gem_object
*obj
;
272 obj
= i915_gem_object_alloc(dev
);
276 if (drm_gem_private_object_init(dev
, &obj
->base
, stolen
->size
))
279 i915_gem_object_init(obj
, &i915_gem_object_stolen_ops
);
281 obj
->pages
= i915_pages_create_for_stolen(dev
,
282 stolen
->start
, stolen
->size
);
283 if (obj
->pages
== NULL
)
286 obj
->has_dma_mapping
= true;
287 i915_gem_object_pin_pages(obj
);
288 obj
->stolen
= stolen
;
290 obj
->base
.write_domain
= I915_GEM_DOMAIN_GTT
;
291 obj
->base
.read_domains
= I915_GEM_DOMAIN_GTT
;
292 obj
->cache_level
= I915_CACHE_NONE
;
297 i915_gem_object_free(obj
);
301 struct drm_i915_gem_object
*
302 i915_gem_object_create_stolen(struct drm_device
*dev
, u32 size
)
304 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
305 struct drm_i915_gem_object
*obj
;
306 struct drm_mm_node
*stolen
;
308 if (!drm_mm_initialized(&dev_priv
->mm
.stolen
))
311 DRM_DEBUG_KMS("creating stolen object: size=%x\n", size
);
315 stolen
= drm_mm_search_free(&dev_priv
->mm
.stolen
, size
, 4096, 0);
317 stolen
= drm_mm_get_block(stolen
, size
, 4096);
321 obj
= _i915_gem_object_create_stolen(dev
, stolen
);
325 drm_mm_put_block(stolen
);
329 struct drm_i915_gem_object
*
330 i915_gem_object_create_stolen_for_preallocated(struct drm_device
*dev
,
335 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
336 struct i915_address_space
*ggtt
= &dev_priv
->gtt
.base
;
337 struct drm_i915_gem_object
*obj
;
338 struct drm_mm_node
*stolen
;
339 struct i915_vma
*vma
;
342 if (!drm_mm_initialized(&dev_priv
->mm
.stolen
))
345 DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n",
346 stolen_offset
, gtt_offset
, size
);
348 /* KISS and expect everything to be page-aligned */
349 BUG_ON(stolen_offset
& 4095);
352 if (WARN_ON(size
== 0))
355 stolen
= kzalloc(sizeof(*stolen
), GFP_KERNEL
);
359 stolen
->start
= stolen_offset
;
361 ret
= drm_mm_reserve_node(&dev_priv
->mm
.stolen
, stolen
);
363 DRM_DEBUG_KMS("failed to allocate stolen space\n");
368 obj
= _i915_gem_object_create_stolen(dev
, stolen
);
370 DRM_DEBUG_KMS("failed to allocate stolen object\n");
371 drm_mm_put_block(stolen
);
375 /* Some objects just need physical mem from stolen space */
376 if (gtt_offset
== I915_GTT_OFFSET_NONE
)
379 vma
= i915_gem_vma_create(obj
, ggtt
);
385 /* To simplify the initialisation sequence between KMS and GTT,
386 * we allow construction of the stolen object prior to
387 * setting up the GTT space. The actual reservation will occur
390 vma
->node
.start
= gtt_offset
;
391 vma
->node
.size
= size
;
392 if (drm_mm_initialized(&ggtt
->mm
)) {
393 ret
= drm_mm_reserve_node(&ggtt
->mm
, &vma
->node
);
395 DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
396 i915_gem_vma_destroy(vma
);
401 obj
->has_global_gtt_mapping
= 1;
403 list_add_tail(&obj
->global_list
, &dev_priv
->mm
.bound_list
);
404 list_add_tail(&obj
->mm_list
, &ggtt
->inactive_list
);
409 drm_mm_put_block(stolen
);
410 drm_gem_object_unreference(&obj
->base
);
415 i915_gem_object_release_stolen(struct drm_i915_gem_object
*obj
)
418 drm_mm_put_block(obj
->stolen
);