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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) { | |
3617dc96 AG |
85 | /* |
86 | * One more attempt but this time requesting region from | |
87 | * base + 1, as we have seen that this resolves the region | |
88 | * conflict with the PCI Bus. | |
89 | * This is a BIOS w/a: Some BIOS wrap stolen in the root | |
90 | * PCI bus, but have an off-by-one error. Hence retry the | |
91 | * reservation starting from 1 instead of 0. | |
92 | */ | |
93 | r = devm_request_mem_region(dev->dev, base + 1, | |
94 | dev_priv->gtt.stolen_size - 1, | |
95 | "Graphics Stolen Memory"); | |
96 | if (r == NULL) { | |
97 | DRM_ERROR("conflict detected with stolen region: [0x%08x - 0x%08x]\n", | |
98 | base, base + (uint32_t)dev_priv->gtt.stolen_size); | |
99 | base = 0; | |
100 | } | |
eaba1b8f CW |
101 | } |
102 | ||
e12a2d53 | 103 | return base; |
9797fbfb CW |
104 | } |
105 | ||
11be49eb | 106 | static int i915_setup_compression(struct drm_device *dev, int size) |
9797fbfb CW |
107 | { |
108 | struct drm_i915_private *dev_priv = dev->dev_private; | |
109 | struct drm_mm_node *compressed_fb, *uninitialized_var(compressed_llb); | |
06e78edf | 110 | int ret; |
9797fbfb | 111 | |
06e78edf | 112 | compressed_fb = kzalloc(sizeof(*compressed_fb), GFP_KERNEL); |
9797fbfb | 113 | if (!compressed_fb) |
06e78edf DH |
114 | goto err_llb; |
115 | ||
116 | /* Try to over-allocate to reduce reallocations and fragmentation */ | |
117 | ret = drm_mm_insert_node(&dev_priv->mm.stolen, compressed_fb, | |
118 | size <<= 1, 4096, DRM_MM_SEARCH_DEFAULT); | |
119 | if (ret) | |
120 | ret = drm_mm_insert_node(&dev_priv->mm.stolen, compressed_fb, | |
121 | size >>= 1, 4096, | |
122 | DRM_MM_SEARCH_DEFAULT); | |
123 | if (ret) | |
124 | goto err_llb; | |
9797fbfb | 125 | |
11be49eb CW |
126 | if (HAS_PCH_SPLIT(dev)) |
127 | I915_WRITE(ILK_DPFC_CB_BASE, compressed_fb->start); | |
128 | else if (IS_GM45(dev)) { | |
129 | I915_WRITE(DPFC_CB_BASE, compressed_fb->start); | |
130 | } else { | |
06e78edf | 131 | compressed_llb = kzalloc(sizeof(*compressed_llb), GFP_KERNEL); |
9797fbfb CW |
132 | if (!compressed_llb) |
133 | goto err_fb; | |
134 | ||
06e78edf DH |
135 | ret = drm_mm_insert_node(&dev_priv->mm.stolen, compressed_llb, |
136 | 4096, 4096, DRM_MM_SEARCH_DEFAULT); | |
137 | if (ret) | |
138 | goto err_fb; | |
139 | ||
5c3fe8b0 | 140 | dev_priv->fbc.compressed_llb = compressed_llb; |
11be49eb CW |
141 | |
142 | I915_WRITE(FBC_CFB_BASE, | |
143 | dev_priv->mm.stolen_base + compressed_fb->start); | |
144 | I915_WRITE(FBC_LL_BASE, | |
145 | dev_priv->mm.stolen_base + compressed_llb->start); | |
9797fbfb CW |
146 | } |
147 | ||
5c3fe8b0 BW |
148 | dev_priv->fbc.compressed_fb = compressed_fb; |
149 | dev_priv->fbc.size = size; | |
9797fbfb | 150 | |
11be49eb CW |
151 | DRM_DEBUG_KMS("reserved %d bytes of contiguous stolen space for FBC\n", |
152 | size); | |
9797fbfb | 153 | |
11be49eb | 154 | return 0; |
9797fbfb | 155 | |
9797fbfb | 156 | err_fb: |
06e78edf DH |
157 | kfree(compressed_llb); |
158 | drm_mm_remove_node(compressed_fb); | |
159 | err_llb: | |
160 | kfree(compressed_fb); | |
d8241785 | 161 | 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 |
162 | return -ENOSPC; |
163 | } | |
164 | ||
165 | int i915_gem_stolen_setup_compression(struct drm_device *dev, int size) | |
166 | { | |
167 | struct drm_i915_private *dev_priv = dev->dev_private; | |
168 | ||
446f8d81 | 169 | if (!drm_mm_initialized(&dev_priv->mm.stolen)) |
11be49eb CW |
170 | return -ENODEV; |
171 | ||
5c3fe8b0 | 172 | if (size < dev_priv->fbc.size) |
11be49eb CW |
173 | return 0; |
174 | ||
175 | /* Release any current block */ | |
176 | i915_gem_stolen_cleanup_compression(dev); | |
177 | ||
178 | return i915_setup_compression(dev, size); | |
9797fbfb CW |
179 | } |
180 | ||
11be49eb | 181 | void i915_gem_stolen_cleanup_compression(struct drm_device *dev) |
9797fbfb CW |
182 | { |
183 | struct drm_i915_private *dev_priv = dev->dev_private; | |
184 | ||
5c3fe8b0 | 185 | if (dev_priv->fbc.size == 0) |
11be49eb CW |
186 | return; |
187 | ||
06e78edf DH |
188 | if (dev_priv->fbc.compressed_fb) { |
189 | drm_mm_remove_node(dev_priv->fbc.compressed_fb); | |
190 | kfree(dev_priv->fbc.compressed_fb); | |
191 | } | |
11be49eb | 192 | |
06e78edf DH |
193 | if (dev_priv->fbc.compressed_llb) { |
194 | drm_mm_remove_node(dev_priv->fbc.compressed_llb); | |
195 | kfree(dev_priv->fbc.compressed_llb); | |
196 | } | |
11be49eb | 197 | |
5c3fe8b0 | 198 | dev_priv->fbc.size = 0; |
9797fbfb CW |
199 | } |
200 | ||
201 | void i915_gem_cleanup_stolen(struct drm_device *dev) | |
202 | { | |
4d7bb011 DV |
203 | struct drm_i915_private *dev_priv = dev->dev_private; |
204 | ||
446f8d81 DV |
205 | if (!drm_mm_initialized(&dev_priv->mm.stolen)) |
206 | return; | |
207 | ||
11be49eb | 208 | i915_gem_stolen_cleanup_compression(dev); |
4d7bb011 | 209 | drm_mm_takedown(&dev_priv->mm.stolen); |
9797fbfb CW |
210 | } |
211 | ||
212 | int i915_gem_init_stolen(struct drm_device *dev) | |
213 | { | |
214 | struct drm_i915_private *dev_priv = dev->dev_private; | |
c9cddffc | 215 | int bios_reserved = 0; |
9797fbfb | 216 | |
0f4706d2 | 217 | #ifdef CONFIG_INTEL_IOMMU |
fcc9fe1a | 218 | if (intel_iommu_gfx_mapped && INTEL_INFO(dev)->gen < 8) { |
0f4706d2 CW |
219 | DRM_INFO("DMAR active, disabling use of stolen memory\n"); |
220 | return 0; | |
221 | } | |
222 | #endif | |
223 | ||
6644a4e9 CW |
224 | if (dev_priv->gtt.stolen_size == 0) |
225 | return 0; | |
226 | ||
e12a2d53 CW |
227 | dev_priv->mm.stolen_base = i915_stolen_to_physical(dev); |
228 | if (dev_priv->mm.stolen_base == 0) | |
229 | return 0; | |
230 | ||
a54c0c27 BW |
231 | DRM_DEBUG_KMS("found %zd bytes of stolen memory at %08lx\n", |
232 | dev_priv->gtt.stolen_size, dev_priv->mm.stolen_base); | |
e12a2d53 | 233 | |
c9cddffc JB |
234 | if (IS_VALLEYVIEW(dev)) |
235 | bios_reserved = 1024*1024; /* top 1M on VLV/BYT */ | |
236 | ||
897f9ed0 DV |
237 | if (WARN_ON(bios_reserved > dev_priv->gtt.stolen_size)) |
238 | return 0; | |
239 | ||
9797fbfb | 240 | /* Basic memrange allocator for stolen space */ |
c9cddffc JB |
241 | drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->gtt.stolen_size - |
242 | bios_reserved); | |
9797fbfb CW |
243 | |
244 | return 0; | |
245 | } | |
0104fdbb CW |
246 | |
247 | static struct sg_table * | |
248 | i915_pages_create_for_stolen(struct drm_device *dev, | |
249 | u32 offset, u32 size) | |
250 | { | |
251 | struct drm_i915_private *dev_priv = dev->dev_private; | |
252 | struct sg_table *st; | |
253 | struct scatterlist *sg; | |
254 | ||
255 | DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size); | |
a54c0c27 | 256 | BUG_ON(offset > dev_priv->gtt.stolen_size - size); |
0104fdbb CW |
257 | |
258 | /* We hide that we have no struct page backing our stolen object | |
259 | * by wrapping the contiguous physical allocation with a fake | |
260 | * dma mapping in a single scatterlist. | |
261 | */ | |
262 | ||
263 | st = kmalloc(sizeof(*st), GFP_KERNEL); | |
264 | if (st == NULL) | |
265 | return NULL; | |
266 | ||
267 | if (sg_alloc_table(st, 1, GFP_KERNEL)) { | |
268 | kfree(st); | |
269 | return NULL; | |
270 | } | |
271 | ||
272 | sg = st->sgl; | |
ec14ba47 | 273 | sg->offset = 0; |
ed23abdd | 274 | sg->length = size; |
0104fdbb CW |
275 | |
276 | sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset; | |
277 | sg_dma_len(sg) = size; | |
278 | ||
279 | return st; | |
280 | } | |
281 | ||
282 | static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj) | |
283 | { | |
284 | BUG(); | |
285 | return -EINVAL; | |
286 | } | |
287 | ||
288 | static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj) | |
289 | { | |
290 | /* Should only be called during free */ | |
291 | sg_free_table(obj->pages); | |
292 | kfree(obj->pages); | |
293 | } | |
294 | ||
ef0cf27c CW |
295 | |
296 | static void | |
297 | i915_gem_object_release_stolen(struct drm_i915_gem_object *obj) | |
298 | { | |
299 | if (obj->stolen) { | |
300 | drm_mm_remove_node(obj->stolen); | |
301 | kfree(obj->stolen); | |
302 | obj->stolen = NULL; | |
303 | } | |
304 | } | |
0104fdbb CW |
305 | static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = { |
306 | .get_pages = i915_gem_object_get_pages_stolen, | |
307 | .put_pages = i915_gem_object_put_pages_stolen, | |
ef0cf27c | 308 | .release = i915_gem_object_release_stolen, |
0104fdbb CW |
309 | }; |
310 | ||
311 | static struct drm_i915_gem_object * | |
312 | _i915_gem_object_create_stolen(struct drm_device *dev, | |
313 | struct drm_mm_node *stolen) | |
314 | { | |
315 | struct drm_i915_gem_object *obj; | |
316 | ||
42dcedd4 | 317 | obj = i915_gem_object_alloc(dev); |
0104fdbb CW |
318 | if (obj == NULL) |
319 | return NULL; | |
320 | ||
89c8233f | 321 | drm_gem_private_object_init(dev, &obj->base, stolen->size); |
0104fdbb CW |
322 | i915_gem_object_init(obj, &i915_gem_object_stolen_ops); |
323 | ||
324 | obj->pages = i915_pages_create_for_stolen(dev, | |
325 | stolen->start, stolen->size); | |
326 | if (obj->pages == NULL) | |
327 | goto cleanup; | |
328 | ||
329 | obj->has_dma_mapping = true; | |
dd53e1b0 | 330 | i915_gem_object_pin_pages(obj); |
0104fdbb CW |
331 | obj->stolen = stolen; |
332 | ||
d46f1c3f CW |
333 | obj->base.read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT; |
334 | obj->cache_level = HAS_LLC(dev) ? I915_CACHE_LLC : I915_CACHE_NONE; | |
0104fdbb CW |
335 | |
336 | return obj; | |
337 | ||
338 | cleanup: | |
42dcedd4 | 339 | i915_gem_object_free(obj); |
0104fdbb CW |
340 | return NULL; |
341 | } | |
342 | ||
343 | struct drm_i915_gem_object * | |
344 | i915_gem_object_create_stolen(struct drm_device *dev, u32 size) | |
345 | { | |
346 | struct drm_i915_private *dev_priv = dev->dev_private; | |
347 | struct drm_i915_gem_object *obj; | |
348 | struct drm_mm_node *stolen; | |
06e78edf | 349 | int ret; |
0104fdbb | 350 | |
446f8d81 | 351 | if (!drm_mm_initialized(&dev_priv->mm.stolen)) |
0104fdbb CW |
352 | return NULL; |
353 | ||
354 | DRM_DEBUG_KMS("creating stolen object: size=%x\n", size); | |
355 | if (size == 0) | |
356 | return NULL; | |
357 | ||
06e78edf DH |
358 | stolen = kzalloc(sizeof(*stolen), GFP_KERNEL); |
359 | if (!stolen) | |
0104fdbb CW |
360 | return NULL; |
361 | ||
06e78edf DH |
362 | ret = drm_mm_insert_node(&dev_priv->mm.stolen, stolen, size, |
363 | 4096, DRM_MM_SEARCH_DEFAULT); | |
364 | if (ret) { | |
365 | kfree(stolen); | |
366 | return NULL; | |
367 | } | |
368 | ||
0104fdbb CW |
369 | obj = _i915_gem_object_create_stolen(dev, stolen); |
370 | if (obj) | |
371 | return obj; | |
372 | ||
06e78edf DH |
373 | drm_mm_remove_node(stolen); |
374 | kfree(stolen); | |
0104fdbb CW |
375 | return NULL; |
376 | } | |
377 | ||
866d12b4 CW |
378 | struct drm_i915_gem_object * |
379 | i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev, | |
380 | u32 stolen_offset, | |
381 | u32 gtt_offset, | |
382 | u32 size) | |
383 | { | |
384 | struct drm_i915_private *dev_priv = dev->dev_private; | |
40d74980 | 385 | struct i915_address_space *ggtt = &dev_priv->gtt.base; |
866d12b4 CW |
386 | struct drm_i915_gem_object *obj; |
387 | struct drm_mm_node *stolen; | |
2f633156 | 388 | struct i915_vma *vma; |
b3a070cc | 389 | int ret; |
866d12b4 | 390 | |
446f8d81 | 391 | if (!drm_mm_initialized(&dev_priv->mm.stolen)) |
866d12b4 CW |
392 | return NULL; |
393 | ||
394 | DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n", | |
395 | stolen_offset, gtt_offset, size); | |
396 | ||
397 | /* KISS and expect everything to be page-aligned */ | |
398 | BUG_ON(stolen_offset & 4095); | |
866d12b4 CW |
399 | BUG_ON(size & 4095); |
400 | ||
401 | if (WARN_ON(size == 0)) | |
402 | return NULL; | |
403 | ||
b3a070cc BW |
404 | stolen = kzalloc(sizeof(*stolen), GFP_KERNEL); |
405 | if (!stolen) | |
406 | return NULL; | |
407 | ||
338710e7 BW |
408 | stolen->start = stolen_offset; |
409 | stolen->size = size; | |
410 | ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen); | |
b3a070cc | 411 | if (ret) { |
866d12b4 | 412 | DRM_DEBUG_KMS("failed to allocate stolen space\n"); |
b3a070cc | 413 | kfree(stolen); |
866d12b4 CW |
414 | return NULL; |
415 | } | |
416 | ||
417 | obj = _i915_gem_object_create_stolen(dev, stolen); | |
418 | if (obj == NULL) { | |
419 | DRM_DEBUG_KMS("failed to allocate stolen object\n"); | |
06e78edf DH |
420 | drm_mm_remove_node(stolen); |
421 | kfree(stolen); | |
866d12b4 CW |
422 | return NULL; |
423 | } | |
424 | ||
3727d55e | 425 | /* Some objects just need physical mem from stolen space */ |
190d6cd5 | 426 | if (gtt_offset == I915_GTT_OFFSET_NONE) |
3727d55e JB |
427 | return obj; |
428 | ||
e656a6cb | 429 | vma = i915_gem_obj_lookup_or_create_vma(obj, ggtt); |
db473b36 DC |
430 | if (IS_ERR(vma)) { |
431 | ret = PTR_ERR(vma); | |
2f633156 BW |
432 | goto err_out; |
433 | } | |
434 | ||
866d12b4 CW |
435 | /* To simplify the initialisation sequence between KMS and GTT, |
436 | * we allow construction of the stolen object prior to | |
437 | * setting up the GTT space. The actual reservation will occur | |
438 | * later. | |
439 | */ | |
2f633156 BW |
440 | vma->node.start = gtt_offset; |
441 | vma->node.size = size; | |
40d74980 BW |
442 | if (drm_mm_initialized(&ggtt->mm)) { |
443 | ret = drm_mm_reserve_node(&ggtt->mm, &vma->node); | |
b3a070cc | 444 | if (ret) { |
866d12b4 | 445 | DRM_DEBUG_KMS("failed to allocate stolen GTT space\n"); |
4a025e26 | 446 | goto err_vma; |
866d12b4 | 447 | } |
edd41a87 | 448 | } |
866d12b4 | 449 | |
866d12b4 CW |
450 | obj->has_global_gtt_mapping = 1; |
451 | ||
35c20a60 | 452 | list_add_tail(&obj->global_list, &dev_priv->mm.bound_list); |
ca191b13 | 453 | list_add_tail(&vma->mm_list, &ggtt->inactive_list); |
d8ccba86 | 454 | i915_gem_object_pin_pages(obj); |
866d12b4 CW |
455 | |
456 | return obj; | |
b3a070cc | 457 | |
4a025e26 DV |
458 | err_vma: |
459 | i915_gem_vma_destroy(vma); | |
f7f18184 | 460 | err_out: |
32c913e4 DA |
461 | drm_mm_remove_node(stolen); |
462 | kfree(stolen); | |
b3a070cc BW |
463 | drm_gem_object_unreference(&obj->base); |
464 | return NULL; | |
866d12b4 | 465 | } |