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); | |
06e78edf | 97 | int ret; |
9797fbfb | 98 | |
06e78edf | 99 | compressed_fb = kzalloc(sizeof(*compressed_fb), GFP_KERNEL); |
9797fbfb | 100 | if (!compressed_fb) |
06e78edf DH |
101 | goto err_llb; |
102 | ||
103 | /* Try to over-allocate to reduce reallocations and fragmentation */ | |
104 | ret = drm_mm_insert_node(&dev_priv->mm.stolen, compressed_fb, | |
105 | size <<= 1, 4096, DRM_MM_SEARCH_DEFAULT); | |
106 | if (ret) | |
107 | ret = drm_mm_insert_node(&dev_priv->mm.stolen, compressed_fb, | |
108 | size >>= 1, 4096, | |
109 | DRM_MM_SEARCH_DEFAULT); | |
110 | if (ret) | |
111 | goto err_llb; | |
9797fbfb | 112 | |
11be49eb CW |
113 | if (HAS_PCH_SPLIT(dev)) |
114 | I915_WRITE(ILK_DPFC_CB_BASE, compressed_fb->start); | |
115 | else if (IS_GM45(dev)) { | |
116 | I915_WRITE(DPFC_CB_BASE, compressed_fb->start); | |
117 | } else { | |
06e78edf | 118 | compressed_llb = kzalloc(sizeof(*compressed_llb), GFP_KERNEL); |
9797fbfb CW |
119 | if (!compressed_llb) |
120 | goto err_fb; | |
121 | ||
06e78edf DH |
122 | ret = drm_mm_insert_node(&dev_priv->mm.stolen, compressed_llb, |
123 | 4096, 4096, DRM_MM_SEARCH_DEFAULT); | |
124 | if (ret) | |
125 | goto err_fb; | |
126 | ||
5c3fe8b0 | 127 | dev_priv->fbc.compressed_llb = compressed_llb; |
11be49eb CW |
128 | |
129 | I915_WRITE(FBC_CFB_BASE, | |
130 | dev_priv->mm.stolen_base + compressed_fb->start); | |
131 | I915_WRITE(FBC_LL_BASE, | |
132 | dev_priv->mm.stolen_base + compressed_llb->start); | |
9797fbfb CW |
133 | } |
134 | ||
5c3fe8b0 BW |
135 | dev_priv->fbc.compressed_fb = compressed_fb; |
136 | dev_priv->fbc.size = size; | |
9797fbfb | 137 | |
11be49eb CW |
138 | DRM_DEBUG_KMS("reserved %d bytes of contiguous stolen space for FBC\n", |
139 | size); | |
9797fbfb | 140 | |
11be49eb | 141 | return 0; |
9797fbfb | 142 | |
9797fbfb | 143 | err_fb: |
06e78edf DH |
144 | kfree(compressed_llb); |
145 | drm_mm_remove_node(compressed_fb); | |
146 | err_llb: | |
147 | kfree(compressed_fb); | |
d8241785 | 148 | 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 |
149 | return -ENOSPC; |
150 | } | |
151 | ||
152 | int i915_gem_stolen_setup_compression(struct drm_device *dev, int size) | |
153 | { | |
154 | struct drm_i915_private *dev_priv = dev->dev_private; | |
155 | ||
446f8d81 | 156 | if (!drm_mm_initialized(&dev_priv->mm.stolen)) |
11be49eb CW |
157 | return -ENODEV; |
158 | ||
5c3fe8b0 | 159 | if (size < dev_priv->fbc.size) |
11be49eb CW |
160 | return 0; |
161 | ||
162 | /* Release any current block */ | |
163 | i915_gem_stolen_cleanup_compression(dev); | |
164 | ||
165 | return i915_setup_compression(dev, size); | |
9797fbfb CW |
166 | } |
167 | ||
11be49eb | 168 | void i915_gem_stolen_cleanup_compression(struct drm_device *dev) |
9797fbfb CW |
169 | { |
170 | struct drm_i915_private *dev_priv = dev->dev_private; | |
171 | ||
5c3fe8b0 | 172 | if (dev_priv->fbc.size == 0) |
11be49eb CW |
173 | return; |
174 | ||
06e78edf DH |
175 | if (dev_priv->fbc.compressed_fb) { |
176 | drm_mm_remove_node(dev_priv->fbc.compressed_fb); | |
177 | kfree(dev_priv->fbc.compressed_fb); | |
178 | } | |
11be49eb | 179 | |
06e78edf DH |
180 | if (dev_priv->fbc.compressed_llb) { |
181 | drm_mm_remove_node(dev_priv->fbc.compressed_llb); | |
182 | kfree(dev_priv->fbc.compressed_llb); | |
183 | } | |
11be49eb | 184 | |
5c3fe8b0 | 185 | dev_priv->fbc.size = 0; |
9797fbfb CW |
186 | } |
187 | ||
188 | void i915_gem_cleanup_stolen(struct drm_device *dev) | |
189 | { | |
4d7bb011 DV |
190 | struct drm_i915_private *dev_priv = dev->dev_private; |
191 | ||
446f8d81 DV |
192 | if (!drm_mm_initialized(&dev_priv->mm.stolen)) |
193 | return; | |
194 | ||
11be49eb | 195 | i915_gem_stolen_cleanup_compression(dev); |
4d7bb011 | 196 | drm_mm_takedown(&dev_priv->mm.stolen); |
9797fbfb CW |
197 | } |
198 | ||
199 | int i915_gem_init_stolen(struct drm_device *dev) | |
200 | { | |
201 | struct drm_i915_private *dev_priv = dev->dev_private; | |
c9cddffc | 202 | int bios_reserved = 0; |
9797fbfb | 203 | |
e12a2d53 CW |
204 | dev_priv->mm.stolen_base = i915_stolen_to_physical(dev); |
205 | if (dev_priv->mm.stolen_base == 0) | |
206 | return 0; | |
207 | ||
a54c0c27 BW |
208 | DRM_DEBUG_KMS("found %zd bytes of stolen memory at %08lx\n", |
209 | dev_priv->gtt.stolen_size, dev_priv->mm.stolen_base); | |
e12a2d53 | 210 | |
c9cddffc JB |
211 | if (IS_VALLEYVIEW(dev)) |
212 | bios_reserved = 1024*1024; /* top 1M on VLV/BYT */ | |
213 | ||
897f9ed0 DV |
214 | if (WARN_ON(bios_reserved > dev_priv->gtt.stolen_size)) |
215 | return 0; | |
216 | ||
9797fbfb | 217 | /* Basic memrange allocator for stolen space */ |
c9cddffc JB |
218 | drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->gtt.stolen_size - |
219 | bios_reserved); | |
9797fbfb CW |
220 | |
221 | return 0; | |
222 | } | |
0104fdbb CW |
223 | |
224 | static struct sg_table * | |
225 | i915_pages_create_for_stolen(struct drm_device *dev, | |
226 | u32 offset, u32 size) | |
227 | { | |
228 | struct drm_i915_private *dev_priv = dev->dev_private; | |
229 | struct sg_table *st; | |
230 | struct scatterlist *sg; | |
231 | ||
232 | DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size); | |
a54c0c27 | 233 | BUG_ON(offset > dev_priv->gtt.stolen_size - size); |
0104fdbb CW |
234 | |
235 | /* We hide that we have no struct page backing our stolen object | |
236 | * by wrapping the contiguous physical allocation with a fake | |
237 | * dma mapping in a single scatterlist. | |
238 | */ | |
239 | ||
240 | st = kmalloc(sizeof(*st), GFP_KERNEL); | |
241 | if (st == NULL) | |
242 | return NULL; | |
243 | ||
244 | if (sg_alloc_table(st, 1, GFP_KERNEL)) { | |
245 | kfree(st); | |
246 | return NULL; | |
247 | } | |
248 | ||
249 | sg = st->sgl; | |
ed23abdd ID |
250 | sg->offset = offset; |
251 | sg->length = size; | |
0104fdbb CW |
252 | |
253 | sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset; | |
254 | sg_dma_len(sg) = size; | |
255 | ||
256 | return st; | |
257 | } | |
258 | ||
259 | static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj) | |
260 | { | |
261 | BUG(); | |
262 | return -EINVAL; | |
263 | } | |
264 | ||
265 | static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj) | |
266 | { | |
267 | /* Should only be called during free */ | |
268 | sg_free_table(obj->pages); | |
269 | kfree(obj->pages); | |
270 | } | |
271 | ||
272 | static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = { | |
273 | .get_pages = i915_gem_object_get_pages_stolen, | |
274 | .put_pages = i915_gem_object_put_pages_stolen, | |
275 | }; | |
276 | ||
277 | static struct drm_i915_gem_object * | |
278 | _i915_gem_object_create_stolen(struct drm_device *dev, | |
279 | struct drm_mm_node *stolen) | |
280 | { | |
281 | struct drm_i915_gem_object *obj; | |
282 | ||
42dcedd4 | 283 | obj = i915_gem_object_alloc(dev); |
0104fdbb CW |
284 | if (obj == NULL) |
285 | return NULL; | |
286 | ||
89c8233f | 287 | drm_gem_private_object_init(dev, &obj->base, stolen->size); |
0104fdbb CW |
288 | i915_gem_object_init(obj, &i915_gem_object_stolen_ops); |
289 | ||
290 | obj->pages = i915_pages_create_for_stolen(dev, | |
291 | stolen->start, stolen->size); | |
292 | if (obj->pages == NULL) | |
293 | goto cleanup; | |
294 | ||
295 | obj->has_dma_mapping = true; | |
dd53e1b0 | 296 | i915_gem_object_pin_pages(obj); |
0104fdbb CW |
297 | obj->stolen = stolen; |
298 | ||
d46f1c3f CW |
299 | obj->base.read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT; |
300 | obj->cache_level = HAS_LLC(dev) ? I915_CACHE_LLC : I915_CACHE_NONE; | |
0104fdbb CW |
301 | |
302 | return obj; | |
303 | ||
304 | cleanup: | |
42dcedd4 | 305 | i915_gem_object_free(obj); |
0104fdbb CW |
306 | return NULL; |
307 | } | |
308 | ||
309 | struct drm_i915_gem_object * | |
310 | i915_gem_object_create_stolen(struct drm_device *dev, u32 size) | |
311 | { | |
312 | struct drm_i915_private *dev_priv = dev->dev_private; | |
313 | struct drm_i915_gem_object *obj; | |
314 | struct drm_mm_node *stolen; | |
06e78edf | 315 | int ret; |
0104fdbb | 316 | |
446f8d81 | 317 | if (!drm_mm_initialized(&dev_priv->mm.stolen)) |
0104fdbb CW |
318 | return NULL; |
319 | ||
320 | DRM_DEBUG_KMS("creating stolen object: size=%x\n", size); | |
321 | if (size == 0) | |
322 | return NULL; | |
323 | ||
06e78edf DH |
324 | stolen = kzalloc(sizeof(*stolen), GFP_KERNEL); |
325 | if (!stolen) | |
0104fdbb CW |
326 | return NULL; |
327 | ||
06e78edf DH |
328 | ret = drm_mm_insert_node(&dev_priv->mm.stolen, stolen, size, |
329 | 4096, DRM_MM_SEARCH_DEFAULT); | |
330 | if (ret) { | |
331 | kfree(stolen); | |
332 | return NULL; | |
333 | } | |
334 | ||
0104fdbb CW |
335 | obj = _i915_gem_object_create_stolen(dev, stolen); |
336 | if (obj) | |
337 | return obj; | |
338 | ||
06e78edf DH |
339 | drm_mm_remove_node(stolen); |
340 | kfree(stolen); | |
0104fdbb CW |
341 | return NULL; |
342 | } | |
343 | ||
866d12b4 CW |
344 | struct drm_i915_gem_object * |
345 | i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev, | |
346 | u32 stolen_offset, | |
347 | u32 gtt_offset, | |
348 | u32 size) | |
349 | { | |
350 | struct drm_i915_private *dev_priv = dev->dev_private; | |
40d74980 | 351 | struct i915_address_space *ggtt = &dev_priv->gtt.base; |
866d12b4 CW |
352 | struct drm_i915_gem_object *obj; |
353 | struct drm_mm_node *stolen; | |
2f633156 | 354 | struct i915_vma *vma; |
b3a070cc | 355 | int ret; |
866d12b4 | 356 | |
446f8d81 | 357 | if (!drm_mm_initialized(&dev_priv->mm.stolen)) |
866d12b4 CW |
358 | return NULL; |
359 | ||
360 | DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n", | |
361 | stolen_offset, gtt_offset, size); | |
362 | ||
363 | /* KISS and expect everything to be page-aligned */ | |
364 | BUG_ON(stolen_offset & 4095); | |
866d12b4 CW |
365 | BUG_ON(size & 4095); |
366 | ||
367 | if (WARN_ON(size == 0)) | |
368 | return NULL; | |
369 | ||
b3a070cc BW |
370 | stolen = kzalloc(sizeof(*stolen), GFP_KERNEL); |
371 | if (!stolen) | |
372 | return NULL; | |
373 | ||
338710e7 BW |
374 | stolen->start = stolen_offset; |
375 | stolen->size = size; | |
376 | ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen); | |
b3a070cc | 377 | if (ret) { |
866d12b4 | 378 | DRM_DEBUG_KMS("failed to allocate stolen space\n"); |
b3a070cc | 379 | kfree(stolen); |
866d12b4 CW |
380 | return NULL; |
381 | } | |
382 | ||
383 | obj = _i915_gem_object_create_stolen(dev, stolen); | |
384 | if (obj == NULL) { | |
385 | DRM_DEBUG_KMS("failed to allocate stolen object\n"); | |
06e78edf DH |
386 | drm_mm_remove_node(stolen); |
387 | kfree(stolen); | |
866d12b4 CW |
388 | return NULL; |
389 | } | |
390 | ||
3727d55e | 391 | /* Some objects just need physical mem from stolen space */ |
190d6cd5 | 392 | if (gtt_offset == I915_GTT_OFFSET_NONE) |
3727d55e JB |
393 | return obj; |
394 | ||
e656a6cb | 395 | vma = i915_gem_obj_lookup_or_create_vma(obj, ggtt); |
db473b36 DC |
396 | if (IS_ERR(vma)) { |
397 | ret = PTR_ERR(vma); | |
2f633156 BW |
398 | goto err_out; |
399 | } | |
400 | ||
866d12b4 CW |
401 | /* To simplify the initialisation sequence between KMS and GTT, |
402 | * we allow construction of the stolen object prior to | |
403 | * setting up the GTT space. The actual reservation will occur | |
404 | * later. | |
405 | */ | |
2f633156 BW |
406 | vma->node.start = gtt_offset; |
407 | vma->node.size = size; | |
40d74980 BW |
408 | if (drm_mm_initialized(&ggtt->mm)) { |
409 | ret = drm_mm_reserve_node(&ggtt->mm, &vma->node); | |
b3a070cc | 410 | if (ret) { |
866d12b4 | 411 | DRM_DEBUG_KMS("failed to allocate stolen GTT space\n"); |
4a025e26 | 412 | goto err_vma; |
866d12b4 | 413 | } |
edd41a87 | 414 | } |
866d12b4 | 415 | |
866d12b4 CW |
416 | obj->has_global_gtt_mapping = 1; |
417 | ||
35c20a60 | 418 | list_add_tail(&obj->global_list, &dev_priv->mm.bound_list); |
ca191b13 | 419 | list_add_tail(&vma->mm_list, &ggtt->inactive_list); |
866d12b4 CW |
420 | |
421 | return obj; | |
b3a070cc | 422 | |
4a025e26 DV |
423 | err_vma: |
424 | i915_gem_vma_destroy(vma); | |
f7f18184 | 425 | err_out: |
32c913e4 DA |
426 | drm_mm_remove_node(stolen); |
427 | kfree(stolen); | |
b3a070cc BW |
428 | drm_gem_object_unreference(&obj->base); |
429 | return NULL; | |
866d12b4 CW |
430 | } |
431 | ||
0104fdbb CW |
432 | void |
433 | i915_gem_object_release_stolen(struct drm_i915_gem_object *obj) | |
434 | { | |
435 | if (obj->stolen) { | |
06e78edf DH |
436 | drm_mm_remove_node(obj->stolen); |
437 | kfree(obj->stolen); | |
0104fdbb CW |
438 | obj->stolen = NULL; |
439 | } | |
440 | } |