Commit | Line | Data |
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9797fbfb CW |
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 | ||
760285e7 DH |
29 | #include <drm/drmP.h> |
30 | #include <drm/i915_drm.h> | |
9797fbfb CW |
31 | #include "i915_drv.h" |
32 | ||
33 | /* | |
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. | |
38 | * | |
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 | |
42 | * for is a boon. | |
43 | */ | |
44 | ||
e12a2d53 | 45 | static unsigned long i915_stolen_to_physical(struct drm_device *dev) |
9797fbfb CW |
46 | { |
47 | struct drm_i915_private *dev_priv = dev->dev_private; | |
eaba1b8f | 48 | struct resource *r; |
9797fbfb CW |
49 | u32 base; |
50 | ||
17fec8a0 CW |
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 | |
58 | * by the e820 probe. | |
e12a2d53 | 59 | * |
17fec8a0 | 60 | * XXX However gen2 requires an unavailable symbol. |
9797fbfb | 61 | */ |
e12a2d53 | 62 | base = 0; |
17fec8a0 CW |
63 | if (INTEL_INFO(dev)->gen >= 3) { |
64 | /* Read Graphics Base of Stolen Memory directly */ | |
c9cddffc JB |
65 | pci_read_config_dword(dev->pdev, 0x5c, &base); |
66 | base &= ~((1<<20) - 1); | |
17fec8a0 | 67 | } else { /* GEN2 */ |
e12a2d53 | 68 | #if 0 |
e12a2d53 CW |
69 | /* Stolen is immediately above Top of Memory */ |
70 | base = max_low_pfn_mapped << PAGE_SHIFT; | |
9797fbfb | 71 | #endif |
e12a2d53 | 72 | } |
9797fbfb | 73 | |
eaba1b8f CW |
74 | if (base == 0) |
75 | return 0; | |
76 | ||
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 | |
80 | * is seriously wrong. | |
81 | */ | |
82 | r = devm_request_mem_region(dev->dev, base, dev_priv->gtt.stolen_size, | |
83 | "Graphics Stolen Memory"); | |
84 | if (r == NULL) { | |
85 | DRM_ERROR("conflict detected with stolen region: [0x%08x - 0x%08x]\n", | |
86 | base, base + (uint32_t)dev_priv->gtt.stolen_size); | |
87 | base = 0; | |
88 | } | |
89 | ||
e12a2d53 | 90 | return base; |
9797fbfb CW |
91 | } |
92 | ||
11be49eb | 93 | static int i915_setup_compression(struct drm_device *dev, int size) |
9797fbfb CW |
94 | { |
95 | struct drm_i915_private *dev_priv = dev->dev_private; | |
96 | struct drm_mm_node *compressed_fb, *uninitialized_var(compressed_llb); | |
9797fbfb | 97 | |
11be49eb CW |
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); | |
101 | if (!compressed_fb) | |
102 | compressed_fb = drm_mm_search_free(&dev_priv->mm.stolen, | |
103 | size >>= 1, 4096, 0); | |
9797fbfb CW |
104 | if (compressed_fb) |
105 | compressed_fb = drm_mm_get_block(compressed_fb, size, 4096); | |
106 | if (!compressed_fb) | |
107 | goto err; | |
108 | ||
11be49eb CW |
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); | |
113 | } else { | |
9797fbfb CW |
114 | compressed_llb = drm_mm_search_free(&dev_priv->mm.stolen, |
115 | 4096, 4096, 0); | |
116 | if (compressed_llb) | |
117 | compressed_llb = drm_mm_get_block(compressed_llb, | |
118 | 4096, 4096); | |
119 | if (!compressed_llb) | |
120 | goto err_fb; | |
121 | ||
5c3fe8b0 | 122 | dev_priv->fbc.compressed_llb = compressed_llb; |
11be49eb CW |
123 | |
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); | |
9797fbfb CW |
128 | } |
129 | ||
5c3fe8b0 BW |
130 | dev_priv->fbc.compressed_fb = compressed_fb; |
131 | dev_priv->fbc.size = size; | |
9797fbfb | 132 | |
11be49eb CW |
133 | DRM_DEBUG_KMS("reserved %d bytes of contiguous stolen space for FBC\n", |
134 | size); | |
9797fbfb | 135 | |
11be49eb | 136 | return 0; |
9797fbfb | 137 | |
9797fbfb CW |
138 | err_fb: |
139 | drm_mm_put_block(compressed_fb); | |
140 | err: | |
d8241785 | 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); |
11be49eb CW |
142 | return -ENOSPC; |
143 | } | |
144 | ||
145 | int i915_gem_stolen_setup_compression(struct drm_device *dev, int size) | |
146 | { | |
147 | struct drm_i915_private *dev_priv = dev->dev_private; | |
148 | ||
446f8d81 | 149 | if (!drm_mm_initialized(&dev_priv->mm.stolen)) |
11be49eb CW |
150 | return -ENODEV; |
151 | ||
5c3fe8b0 | 152 | if (size < dev_priv->fbc.size) |
11be49eb CW |
153 | return 0; |
154 | ||
155 | /* Release any current block */ | |
156 | i915_gem_stolen_cleanup_compression(dev); | |
157 | ||
158 | return i915_setup_compression(dev, size); | |
9797fbfb CW |
159 | } |
160 | ||
11be49eb | 161 | void i915_gem_stolen_cleanup_compression(struct drm_device *dev) |
9797fbfb CW |
162 | { |
163 | struct drm_i915_private *dev_priv = dev->dev_private; | |
164 | ||
5c3fe8b0 | 165 | if (dev_priv->fbc.size == 0) |
11be49eb CW |
166 | return; |
167 | ||
5c3fe8b0 BW |
168 | if (dev_priv->fbc.compressed_fb) |
169 | drm_mm_put_block(dev_priv->fbc.compressed_fb); | |
11be49eb | 170 | |
5c3fe8b0 BW |
171 | if (dev_priv->fbc.compressed_llb) |
172 | drm_mm_put_block(dev_priv->fbc.compressed_llb); | |
11be49eb | 173 | |
5c3fe8b0 | 174 | dev_priv->fbc.size = 0; |
9797fbfb CW |
175 | } |
176 | ||
177 | void i915_gem_cleanup_stolen(struct drm_device *dev) | |
178 | { | |
4d7bb011 DV |
179 | struct drm_i915_private *dev_priv = dev->dev_private; |
180 | ||
446f8d81 DV |
181 | if (!drm_mm_initialized(&dev_priv->mm.stolen)) |
182 | return; | |
183 | ||
11be49eb | 184 | i915_gem_stolen_cleanup_compression(dev); |
4d7bb011 | 185 | drm_mm_takedown(&dev_priv->mm.stolen); |
9797fbfb CW |
186 | } |
187 | ||
188 | int i915_gem_init_stolen(struct drm_device *dev) | |
189 | { | |
190 | struct drm_i915_private *dev_priv = dev->dev_private; | |
c9cddffc | 191 | int bios_reserved = 0; |
9797fbfb | 192 | |
e12a2d53 CW |
193 | dev_priv->mm.stolen_base = i915_stolen_to_physical(dev); |
194 | if (dev_priv->mm.stolen_base == 0) | |
195 | return 0; | |
196 | ||
a54c0c27 BW |
197 | DRM_DEBUG_KMS("found %zd bytes of stolen memory at %08lx\n", |
198 | dev_priv->gtt.stolen_size, dev_priv->mm.stolen_base); | |
e12a2d53 | 199 | |
c9cddffc JB |
200 | if (IS_VALLEYVIEW(dev)) |
201 | bios_reserved = 1024*1024; /* top 1M on VLV/BYT */ | |
202 | ||
897f9ed0 DV |
203 | if (WARN_ON(bios_reserved > dev_priv->gtt.stolen_size)) |
204 | return 0; | |
205 | ||
9797fbfb | 206 | /* Basic memrange allocator for stolen space */ |
c9cddffc JB |
207 | drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->gtt.stolen_size - |
208 | bios_reserved); | |
9797fbfb CW |
209 | |
210 | return 0; | |
211 | } | |
0104fdbb CW |
212 | |
213 | static struct sg_table * | |
214 | i915_pages_create_for_stolen(struct drm_device *dev, | |
215 | u32 offset, u32 size) | |
216 | { | |
217 | struct drm_i915_private *dev_priv = dev->dev_private; | |
218 | struct sg_table *st; | |
219 | struct scatterlist *sg; | |
220 | ||
221 | DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size); | |
a54c0c27 | 222 | BUG_ON(offset > dev_priv->gtt.stolen_size - size); |
0104fdbb CW |
223 | |
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. | |
227 | */ | |
228 | ||
229 | st = kmalloc(sizeof(*st), GFP_KERNEL); | |
230 | if (st == NULL) | |
231 | return NULL; | |
232 | ||
233 | if (sg_alloc_table(st, 1, GFP_KERNEL)) { | |
234 | kfree(st); | |
235 | return NULL; | |
236 | } | |
237 | ||
238 | sg = st->sgl; | |
ed23abdd ID |
239 | sg->offset = offset; |
240 | sg->length = size; | |
0104fdbb CW |
241 | |
242 | sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset; | |
243 | sg_dma_len(sg) = size; | |
244 | ||
245 | return st; | |
246 | } | |
247 | ||
248 | static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj) | |
249 | { | |
250 | BUG(); | |
251 | return -EINVAL; | |
252 | } | |
253 | ||
254 | static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj) | |
255 | { | |
256 | /* Should only be called during free */ | |
257 | sg_free_table(obj->pages); | |
258 | kfree(obj->pages); | |
259 | } | |
260 | ||
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, | |
264 | }; | |
265 | ||
266 | static struct drm_i915_gem_object * | |
267 | _i915_gem_object_create_stolen(struct drm_device *dev, | |
268 | struct drm_mm_node *stolen) | |
269 | { | |
270 | struct drm_i915_gem_object *obj; | |
271 | ||
42dcedd4 | 272 | obj = i915_gem_object_alloc(dev); |
0104fdbb CW |
273 | if (obj == NULL) |
274 | return NULL; | |
275 | ||
276 | if (drm_gem_private_object_init(dev, &obj->base, stolen->size)) | |
277 | goto cleanup; | |
278 | ||
279 | i915_gem_object_init(obj, &i915_gem_object_stolen_ops); | |
280 | ||
281 | obj->pages = i915_pages_create_for_stolen(dev, | |
282 | stolen->start, stolen->size); | |
283 | if (obj->pages == NULL) | |
284 | goto cleanup; | |
285 | ||
286 | obj->has_dma_mapping = true; | |
dd53e1b0 | 287 | i915_gem_object_pin_pages(obj); |
0104fdbb CW |
288 | obj->stolen = stolen; |
289 | ||
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; | |
293 | ||
294 | return obj; | |
295 | ||
296 | cleanup: | |
42dcedd4 | 297 | i915_gem_object_free(obj); |
0104fdbb CW |
298 | return NULL; |
299 | } | |
300 | ||
301 | struct drm_i915_gem_object * | |
302 | i915_gem_object_create_stolen(struct drm_device *dev, u32 size) | |
303 | { | |
304 | struct drm_i915_private *dev_priv = dev->dev_private; | |
305 | struct drm_i915_gem_object *obj; | |
306 | struct drm_mm_node *stolen; | |
307 | ||
446f8d81 | 308 | if (!drm_mm_initialized(&dev_priv->mm.stolen)) |
0104fdbb CW |
309 | return NULL; |
310 | ||
311 | DRM_DEBUG_KMS("creating stolen object: size=%x\n", size); | |
312 | if (size == 0) | |
313 | return NULL; | |
314 | ||
315 | stolen = drm_mm_search_free(&dev_priv->mm.stolen, size, 4096, 0); | |
316 | if (stolen) | |
317 | stolen = drm_mm_get_block(stolen, size, 4096); | |
318 | if (stolen == NULL) | |
319 | return NULL; | |
320 | ||
321 | obj = _i915_gem_object_create_stolen(dev, stolen); | |
322 | if (obj) | |
323 | return obj; | |
324 | ||
325 | drm_mm_put_block(stolen); | |
326 | return NULL; | |
327 | } | |
328 | ||
866d12b4 CW |
329 | struct drm_i915_gem_object * |
330 | i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev, | |
331 | u32 stolen_offset, | |
332 | u32 gtt_offset, | |
333 | u32 size) | |
334 | { | |
335 | struct drm_i915_private *dev_priv = dev->dev_private; | |
40d74980 | 336 | struct i915_address_space *ggtt = &dev_priv->gtt.base; |
866d12b4 CW |
337 | struct drm_i915_gem_object *obj; |
338 | struct drm_mm_node *stolen; | |
2f633156 | 339 | struct i915_vma *vma; |
b3a070cc | 340 | int ret; |
866d12b4 | 341 | |
446f8d81 | 342 | if (!drm_mm_initialized(&dev_priv->mm.stolen)) |
866d12b4 CW |
343 | return NULL; |
344 | ||
345 | DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n", | |
346 | stolen_offset, gtt_offset, size); | |
347 | ||
348 | /* KISS and expect everything to be page-aligned */ | |
349 | BUG_ON(stolen_offset & 4095); | |
866d12b4 CW |
350 | BUG_ON(size & 4095); |
351 | ||
352 | if (WARN_ON(size == 0)) | |
353 | return NULL; | |
354 | ||
b3a070cc BW |
355 | stolen = kzalloc(sizeof(*stolen), GFP_KERNEL); |
356 | if (!stolen) | |
357 | return NULL; | |
358 | ||
338710e7 BW |
359 | stolen->start = stolen_offset; |
360 | stolen->size = size; | |
361 | ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen); | |
b3a070cc | 362 | if (ret) { |
866d12b4 | 363 | DRM_DEBUG_KMS("failed to allocate stolen space\n"); |
b3a070cc | 364 | kfree(stolen); |
866d12b4 CW |
365 | return NULL; |
366 | } | |
367 | ||
368 | obj = _i915_gem_object_create_stolen(dev, stolen); | |
369 | if (obj == NULL) { | |
370 | DRM_DEBUG_KMS("failed to allocate stolen object\n"); | |
371 | drm_mm_put_block(stolen); | |
372 | return NULL; | |
373 | } | |
374 | ||
3727d55e | 375 | /* Some objects just need physical mem from stolen space */ |
190d6cd5 | 376 | if (gtt_offset == I915_GTT_OFFSET_NONE) |
3727d55e JB |
377 | return obj; |
378 | ||
40d74980 | 379 | vma = i915_gem_vma_create(obj, ggtt); |
db473b36 DC |
380 | if (IS_ERR(vma)) { |
381 | ret = PTR_ERR(vma); | |
2f633156 BW |
382 | goto err_out; |
383 | } | |
384 | ||
866d12b4 CW |
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 | |
388 | * later. | |
389 | */ | |
2f633156 BW |
390 | vma->node.start = gtt_offset; |
391 | vma->node.size = size; | |
40d74980 BW |
392 | if (drm_mm_initialized(&ggtt->mm)) { |
393 | ret = drm_mm_reserve_node(&ggtt->mm, &vma->node); | |
b3a070cc | 394 | if (ret) { |
866d12b4 | 395 | DRM_DEBUG_KMS("failed to allocate stolen GTT space\n"); |
2f633156 | 396 | i915_gem_vma_destroy(vma); |
f7f18184 | 397 | goto err_out; |
866d12b4 | 398 | } |
edd41a87 | 399 | } |
866d12b4 | 400 | |
866d12b4 CW |
401 | obj->has_global_gtt_mapping = 1; |
402 | ||
35c20a60 | 403 | list_add_tail(&obj->global_list, &dev_priv->mm.bound_list); |
40d74980 | 404 | list_add_tail(&obj->mm_list, &ggtt->inactive_list); |
866d12b4 CW |
405 | |
406 | return obj; | |
b3a070cc | 407 | |
f7f18184 BW |
408 | err_out: |
409 | drm_mm_put_block(stolen); | |
b3a070cc BW |
410 | drm_gem_object_unreference(&obj->base); |
411 | return NULL; | |
866d12b4 CW |
412 | } |
413 | ||
0104fdbb CW |
414 | void |
415 | i915_gem_object_release_stolen(struct drm_i915_gem_object *obj) | |
416 | { | |
417 | if (obj->stolen) { | |
418 | drm_mm_put_block(obj->stolen); | |
419 | obj->stolen = NULL; | |
420 | } | |
421 | } |