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; | |
48 | struct pci_dev *pdev = dev_priv->bridge_dev; | |
eaba1b8f | 49 | struct resource *r; |
9797fbfb CW |
50 | u32 base; |
51 | ||
9797fbfb | 52 | /* On the machines I have tested the Graphics Base of Stolen Memory |
e12a2d53 CW |
53 | * is unreliable, so on those compute the base by subtracting the |
54 | * stolen memory from the Top of Low Usable DRAM which is where the | |
55 | * BIOS places the graphics stolen memory. | |
56 | * | |
57 | * On gen2, the layout is slightly different with the Graphics Segment | |
58 | * immediately following Top of Memory (or Top of Usable DRAM). Note | |
59 | * it appears that TOUD is only reported by 865g, so we just use the | |
60 | * top of memory as determined by the e820 probe. | |
61 | * | |
62 | * XXX gen2 requires an unavailable symbol and 945gm fails with | |
63 | * its value of TOLUD. | |
9797fbfb | 64 | */ |
e12a2d53 | 65 | base = 0; |
c9cddffc JB |
66 | if (IS_VALLEYVIEW(dev)) { |
67 | pci_read_config_dword(dev->pdev, 0x5c, &base); | |
68 | base &= ~((1<<20) - 1); | |
69 | } else if (INTEL_INFO(dev)->gen >= 6) { | |
e12a2d53 CW |
70 | /* Read Base Data of Stolen Memory Register (BDSM) directly. |
71 | * Note that there is also a MCHBAR miror at 0x1080c0 or | |
72 | * we could use device 2:0x5c instead. | |
73 | */ | |
74 | pci_read_config_dword(pdev, 0xB0, &base); | |
75 | base &= ~4095; /* lower bits used for locking register */ | |
76 | } else if (INTEL_INFO(dev)->gen > 3 || IS_G33(dev)) { | |
77 | /* Read Graphics Base of Stolen Memory directly */ | |
9797fbfb | 78 | pci_read_config_dword(pdev, 0xA4, &base); |
e12a2d53 CW |
79 | #if 0 |
80 | } else if (IS_GEN3(dev)) { | |
9797fbfb | 81 | u8 val; |
e12a2d53 | 82 | /* Stolen is immediately below Top of Low Usable DRAM */ |
9797fbfb CW |
83 | pci_read_config_byte(pdev, 0x9c, &val); |
84 | base = val >> 3 << 27; | |
e12a2d53 CW |
85 | base -= dev_priv->mm.gtt->stolen_size; |
86 | } else { | |
87 | /* Stolen is immediately above Top of Memory */ | |
88 | base = max_low_pfn_mapped << PAGE_SHIFT; | |
9797fbfb | 89 | #endif |
e12a2d53 | 90 | } |
9797fbfb | 91 | |
eaba1b8f CW |
92 | if (base == 0) |
93 | return 0; | |
94 | ||
95 | /* Verify that nothing else uses this physical address. Stolen | |
96 | * memory should be reserved by the BIOS and hidden from the | |
97 | * kernel. So if the region is already marked as busy, something | |
98 | * is seriously wrong. | |
99 | */ | |
100 | r = devm_request_mem_region(dev->dev, base, dev_priv->gtt.stolen_size, | |
101 | "Graphics Stolen Memory"); | |
102 | if (r == NULL) { | |
103 | DRM_ERROR("conflict detected with stolen region: [0x%08x - 0x%08x]\n", | |
104 | base, base + (uint32_t)dev_priv->gtt.stolen_size); | |
105 | base = 0; | |
106 | } | |
107 | ||
e12a2d53 | 108 | return base; |
9797fbfb CW |
109 | } |
110 | ||
11be49eb | 111 | static int i915_setup_compression(struct drm_device *dev, int size) |
9797fbfb CW |
112 | { |
113 | struct drm_i915_private *dev_priv = dev->dev_private; | |
114 | struct drm_mm_node *compressed_fb, *uninitialized_var(compressed_llb); | |
06e78edf | 115 | int ret; |
9797fbfb | 116 | |
06e78edf | 117 | compressed_fb = kzalloc(sizeof(*compressed_fb), GFP_KERNEL); |
9797fbfb | 118 | if (!compressed_fb) |
06e78edf DH |
119 | goto err_llb; |
120 | ||
121 | /* Try to over-allocate to reduce reallocations and fragmentation */ | |
122 | ret = drm_mm_insert_node(&dev_priv->mm.stolen, compressed_fb, | |
123 | size <<= 1, 4096, DRM_MM_SEARCH_DEFAULT); | |
124 | if (ret) | |
125 | ret = drm_mm_insert_node(&dev_priv->mm.stolen, compressed_fb, | |
126 | size >>= 1, 4096, | |
127 | DRM_MM_SEARCH_DEFAULT); | |
128 | if (ret) | |
129 | goto err_llb; | |
9797fbfb | 130 | |
11be49eb CW |
131 | if (HAS_PCH_SPLIT(dev)) |
132 | I915_WRITE(ILK_DPFC_CB_BASE, compressed_fb->start); | |
133 | else if (IS_GM45(dev)) { | |
134 | I915_WRITE(DPFC_CB_BASE, compressed_fb->start); | |
135 | } else { | |
06e78edf | 136 | compressed_llb = kzalloc(sizeof(*compressed_llb), GFP_KERNEL); |
9797fbfb CW |
137 | if (!compressed_llb) |
138 | goto err_fb; | |
139 | ||
06e78edf DH |
140 | ret = drm_mm_insert_node(&dev_priv->mm.stolen, compressed_llb, |
141 | 4096, 4096, DRM_MM_SEARCH_DEFAULT); | |
142 | if (ret) | |
143 | goto err_fb; | |
144 | ||
5c3fe8b0 | 145 | dev_priv->fbc.compressed_llb = compressed_llb; |
11be49eb CW |
146 | |
147 | I915_WRITE(FBC_CFB_BASE, | |
148 | dev_priv->mm.stolen_base + compressed_fb->start); | |
149 | I915_WRITE(FBC_LL_BASE, | |
150 | dev_priv->mm.stolen_base + compressed_llb->start); | |
9797fbfb CW |
151 | } |
152 | ||
5c3fe8b0 BW |
153 | dev_priv->fbc.compressed_fb = compressed_fb; |
154 | dev_priv->fbc.size = size; | |
9797fbfb | 155 | |
11be49eb CW |
156 | DRM_DEBUG_KMS("reserved %d bytes of contiguous stolen space for FBC\n", |
157 | size); | |
9797fbfb | 158 | |
11be49eb | 159 | return 0; |
9797fbfb | 160 | |
9797fbfb | 161 | err_fb: |
06e78edf DH |
162 | kfree(compressed_llb); |
163 | drm_mm_remove_node(compressed_fb); | |
164 | err_llb: | |
165 | kfree(compressed_fb); | |
d8241785 | 166 | 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 |
167 | return -ENOSPC; |
168 | } | |
169 | ||
170 | int i915_gem_stolen_setup_compression(struct drm_device *dev, int size) | |
171 | { | |
172 | struct drm_i915_private *dev_priv = dev->dev_private; | |
173 | ||
446f8d81 | 174 | if (!drm_mm_initialized(&dev_priv->mm.stolen)) |
11be49eb CW |
175 | return -ENODEV; |
176 | ||
5c3fe8b0 | 177 | if (size < dev_priv->fbc.size) |
11be49eb CW |
178 | return 0; |
179 | ||
180 | /* Release any current block */ | |
181 | i915_gem_stolen_cleanup_compression(dev); | |
182 | ||
183 | return i915_setup_compression(dev, size); | |
9797fbfb CW |
184 | } |
185 | ||
11be49eb | 186 | void i915_gem_stolen_cleanup_compression(struct drm_device *dev) |
9797fbfb CW |
187 | { |
188 | struct drm_i915_private *dev_priv = dev->dev_private; | |
189 | ||
5c3fe8b0 | 190 | if (dev_priv->fbc.size == 0) |
11be49eb CW |
191 | return; |
192 | ||
06e78edf DH |
193 | if (dev_priv->fbc.compressed_fb) { |
194 | drm_mm_remove_node(dev_priv->fbc.compressed_fb); | |
195 | kfree(dev_priv->fbc.compressed_fb); | |
196 | } | |
11be49eb | 197 | |
06e78edf DH |
198 | if (dev_priv->fbc.compressed_llb) { |
199 | drm_mm_remove_node(dev_priv->fbc.compressed_llb); | |
200 | kfree(dev_priv->fbc.compressed_llb); | |
201 | } | |
11be49eb | 202 | |
5c3fe8b0 | 203 | dev_priv->fbc.size = 0; |
9797fbfb CW |
204 | } |
205 | ||
206 | void i915_gem_cleanup_stolen(struct drm_device *dev) | |
207 | { | |
4d7bb011 DV |
208 | struct drm_i915_private *dev_priv = dev->dev_private; |
209 | ||
446f8d81 DV |
210 | if (!drm_mm_initialized(&dev_priv->mm.stolen)) |
211 | return; | |
212 | ||
11be49eb | 213 | i915_gem_stolen_cleanup_compression(dev); |
4d7bb011 | 214 | drm_mm_takedown(&dev_priv->mm.stolen); |
9797fbfb CW |
215 | } |
216 | ||
217 | int i915_gem_init_stolen(struct drm_device *dev) | |
218 | { | |
219 | struct drm_i915_private *dev_priv = dev->dev_private; | |
c9cddffc | 220 | int bios_reserved = 0; |
9797fbfb | 221 | |
e12a2d53 CW |
222 | dev_priv->mm.stolen_base = i915_stolen_to_physical(dev); |
223 | if (dev_priv->mm.stolen_base == 0) | |
224 | return 0; | |
225 | ||
a54c0c27 BW |
226 | DRM_DEBUG_KMS("found %zd bytes of stolen memory at %08lx\n", |
227 | dev_priv->gtt.stolen_size, dev_priv->mm.stolen_base); | |
e12a2d53 | 228 | |
c9cddffc JB |
229 | if (IS_VALLEYVIEW(dev)) |
230 | bios_reserved = 1024*1024; /* top 1M on VLV/BYT */ | |
231 | ||
897f9ed0 DV |
232 | if (WARN_ON(bios_reserved > dev_priv->gtt.stolen_size)) |
233 | return 0; | |
234 | ||
9797fbfb | 235 | /* Basic memrange allocator for stolen space */ |
c9cddffc JB |
236 | drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->gtt.stolen_size - |
237 | bios_reserved); | |
9797fbfb CW |
238 | |
239 | return 0; | |
240 | } | |
0104fdbb CW |
241 | |
242 | static struct sg_table * | |
243 | i915_pages_create_for_stolen(struct drm_device *dev, | |
244 | u32 offset, u32 size) | |
245 | { | |
246 | struct drm_i915_private *dev_priv = dev->dev_private; | |
247 | struct sg_table *st; | |
248 | struct scatterlist *sg; | |
249 | ||
250 | DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size); | |
a54c0c27 | 251 | BUG_ON(offset > dev_priv->gtt.stolen_size - size); |
0104fdbb CW |
252 | |
253 | /* We hide that we have no struct page backing our stolen object | |
254 | * by wrapping the contiguous physical allocation with a fake | |
255 | * dma mapping in a single scatterlist. | |
256 | */ | |
257 | ||
258 | st = kmalloc(sizeof(*st), GFP_KERNEL); | |
259 | if (st == NULL) | |
260 | return NULL; | |
261 | ||
262 | if (sg_alloc_table(st, 1, GFP_KERNEL)) { | |
263 | kfree(st); | |
264 | return NULL; | |
265 | } | |
266 | ||
267 | sg = st->sgl; | |
ed23abdd ID |
268 | sg->offset = offset; |
269 | sg->length = size; | |
0104fdbb CW |
270 | |
271 | sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset; | |
272 | sg_dma_len(sg) = size; | |
273 | ||
274 | return st; | |
275 | } | |
276 | ||
277 | static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj) | |
278 | { | |
279 | BUG(); | |
280 | return -EINVAL; | |
281 | } | |
282 | ||
283 | static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj) | |
284 | { | |
285 | /* Should only be called during free */ | |
286 | sg_free_table(obj->pages); | |
287 | kfree(obj->pages); | |
288 | } | |
289 | ||
290 | static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = { | |
291 | .get_pages = i915_gem_object_get_pages_stolen, | |
292 | .put_pages = i915_gem_object_put_pages_stolen, | |
293 | }; | |
294 | ||
295 | static struct drm_i915_gem_object * | |
296 | _i915_gem_object_create_stolen(struct drm_device *dev, | |
297 | struct drm_mm_node *stolen) | |
298 | { | |
299 | struct drm_i915_gem_object *obj; | |
300 | ||
42dcedd4 | 301 | obj = i915_gem_object_alloc(dev); |
0104fdbb CW |
302 | if (obj == NULL) |
303 | return NULL; | |
304 | ||
89c8233f | 305 | drm_gem_private_object_init(dev, &obj->base, stolen->size); |
0104fdbb CW |
306 | i915_gem_object_init(obj, &i915_gem_object_stolen_ops); |
307 | ||
308 | obj->pages = i915_pages_create_for_stolen(dev, | |
309 | stolen->start, stolen->size); | |
310 | if (obj->pages == NULL) | |
311 | goto cleanup; | |
312 | ||
313 | obj->has_dma_mapping = true; | |
dd53e1b0 | 314 | i915_gem_object_pin_pages(obj); |
0104fdbb CW |
315 | obj->stolen = stolen; |
316 | ||
317 | obj->base.write_domain = I915_GEM_DOMAIN_GTT; | |
318 | obj->base.read_domains = I915_GEM_DOMAIN_GTT; | |
319 | obj->cache_level = I915_CACHE_NONE; | |
320 | ||
321 | return obj; | |
322 | ||
323 | cleanup: | |
42dcedd4 | 324 | i915_gem_object_free(obj); |
0104fdbb CW |
325 | return NULL; |
326 | } | |
327 | ||
328 | struct drm_i915_gem_object * | |
329 | i915_gem_object_create_stolen(struct drm_device *dev, u32 size) | |
330 | { | |
331 | struct drm_i915_private *dev_priv = dev->dev_private; | |
332 | struct drm_i915_gem_object *obj; | |
333 | struct drm_mm_node *stolen; | |
06e78edf | 334 | int ret; |
0104fdbb | 335 | |
446f8d81 | 336 | if (!drm_mm_initialized(&dev_priv->mm.stolen)) |
0104fdbb CW |
337 | return NULL; |
338 | ||
339 | DRM_DEBUG_KMS("creating stolen object: size=%x\n", size); | |
340 | if (size == 0) | |
341 | return NULL; | |
342 | ||
06e78edf DH |
343 | stolen = kzalloc(sizeof(*stolen), GFP_KERNEL); |
344 | if (!stolen) | |
0104fdbb CW |
345 | return NULL; |
346 | ||
06e78edf DH |
347 | ret = drm_mm_insert_node(&dev_priv->mm.stolen, stolen, size, |
348 | 4096, DRM_MM_SEARCH_DEFAULT); | |
349 | if (ret) { | |
350 | kfree(stolen); | |
351 | return NULL; | |
352 | } | |
353 | ||
0104fdbb CW |
354 | obj = _i915_gem_object_create_stolen(dev, stolen); |
355 | if (obj) | |
356 | return obj; | |
357 | ||
06e78edf DH |
358 | drm_mm_remove_node(stolen); |
359 | kfree(stolen); | |
0104fdbb CW |
360 | return NULL; |
361 | } | |
362 | ||
866d12b4 CW |
363 | struct drm_i915_gem_object * |
364 | i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev, | |
365 | u32 stolen_offset, | |
366 | u32 gtt_offset, | |
367 | u32 size) | |
368 | { | |
369 | struct drm_i915_private *dev_priv = dev->dev_private; | |
370 | struct drm_i915_gem_object *obj; | |
371 | struct drm_mm_node *stolen; | |
b3a070cc | 372 | int ret; |
866d12b4 | 373 | |
446f8d81 | 374 | if (!drm_mm_initialized(&dev_priv->mm.stolen)) |
866d12b4 CW |
375 | return NULL; |
376 | ||
377 | DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n", | |
378 | stolen_offset, gtt_offset, size); | |
379 | ||
380 | /* KISS and expect everything to be page-aligned */ | |
381 | BUG_ON(stolen_offset & 4095); | |
866d12b4 CW |
382 | BUG_ON(size & 4095); |
383 | ||
384 | if (WARN_ON(size == 0)) | |
385 | return NULL; | |
386 | ||
b3a070cc BW |
387 | stolen = kzalloc(sizeof(*stolen), GFP_KERNEL); |
388 | if (!stolen) | |
389 | return NULL; | |
390 | ||
338710e7 BW |
391 | stolen->start = stolen_offset; |
392 | stolen->size = size; | |
393 | ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen); | |
b3a070cc | 394 | if (ret) { |
866d12b4 | 395 | DRM_DEBUG_KMS("failed to allocate stolen space\n"); |
b3a070cc | 396 | kfree(stolen); |
866d12b4 CW |
397 | return NULL; |
398 | } | |
399 | ||
400 | obj = _i915_gem_object_create_stolen(dev, stolen); | |
401 | if (obj == NULL) { | |
402 | DRM_DEBUG_KMS("failed to allocate stolen object\n"); | |
06e78edf DH |
403 | drm_mm_remove_node(stolen); |
404 | kfree(stolen); | |
866d12b4 CW |
405 | return NULL; |
406 | } | |
407 | ||
3727d55e | 408 | /* Some objects just need physical mem from stolen space */ |
190d6cd5 | 409 | if (gtt_offset == I915_GTT_OFFSET_NONE) |
3727d55e JB |
410 | return obj; |
411 | ||
866d12b4 CW |
412 | /* To simplify the initialisation sequence between KMS and GTT, |
413 | * we allow construction of the stolen object prior to | |
414 | * setting up the GTT space. The actual reservation will occur | |
415 | * later. | |
416 | */ | |
c6cfb325 BW |
417 | obj->gtt_space.start = gtt_offset; |
418 | obj->gtt_space.size = size; | |
866d12b4 | 419 | if (drm_mm_initialized(&dev_priv->mm.gtt_space)) { |
338710e7 | 420 | ret = drm_mm_reserve_node(&dev_priv->mm.gtt_space, |
c6cfb325 | 421 | &obj->gtt_space); |
b3a070cc | 422 | if (ret) { |
866d12b4 | 423 | DRM_DEBUG_KMS("failed to allocate stolen GTT space\n"); |
c6cfb325 | 424 | goto unref_out; |
866d12b4 | 425 | } |
edd41a87 | 426 | } |
866d12b4 | 427 | |
866d12b4 CW |
428 | obj->has_global_gtt_mapping = 1; |
429 | ||
35c20a60 | 430 | list_add_tail(&obj->global_list, &dev_priv->mm.bound_list); |
866d12b4 CW |
431 | list_add_tail(&obj->mm_list, &dev_priv->mm.inactive_list); |
432 | ||
433 | return obj; | |
b3a070cc | 434 | |
b3a070cc BW |
435 | unref_out: |
436 | drm_gem_object_unreference(&obj->base); | |
437 | return NULL; | |
866d12b4 CW |
438 | } |
439 | ||
0104fdbb CW |
440 | void |
441 | i915_gem_object_release_stolen(struct drm_i915_gem_object *obj) | |
442 | { | |
443 | if (obj->stolen) { | |
06e78edf DH |
444 | drm_mm_remove_node(obj->stolen); |
445 | kfree(obj->stolen); | |
0104fdbb CW |
446 | obj->stolen = NULL; |
447 | } | |
448 | } |