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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; | |
49 | u32 base; | |
50 | ||
9797fbfb | 51 | /* On the machines I have tested the Graphics Base of Stolen Memory |
e12a2d53 CW |
52 | * is unreliable, so on those compute the base by subtracting the |
53 | * stolen memory from the Top of Low Usable DRAM which is where the | |
54 | * BIOS places the graphics stolen memory. | |
55 | * | |
56 | * On gen2, the layout is slightly different with the Graphics Segment | |
57 | * immediately following Top of Memory (or Top of Usable DRAM). Note | |
58 | * it appears that TOUD is only reported by 865g, so we just use the | |
59 | * top of memory as determined by the e820 probe. | |
60 | * | |
61 | * XXX gen2 requires an unavailable symbol and 945gm fails with | |
62 | * its value of TOLUD. | |
9797fbfb | 63 | */ |
e12a2d53 | 64 | base = 0; |
c9cddffc JB |
65 | if (IS_VALLEYVIEW(dev)) { |
66 | pci_read_config_dword(dev->pdev, 0x5c, &base); | |
67 | base &= ~((1<<20) - 1); | |
68 | } else if (INTEL_INFO(dev)->gen >= 6) { | |
e12a2d53 CW |
69 | /* Read Base Data of Stolen Memory Register (BDSM) directly. |
70 | * Note that there is also a MCHBAR miror at 0x1080c0 or | |
71 | * we could use device 2:0x5c instead. | |
72 | */ | |
73 | pci_read_config_dword(pdev, 0xB0, &base); | |
74 | base &= ~4095; /* lower bits used for locking register */ | |
75 | } else if (INTEL_INFO(dev)->gen > 3 || IS_G33(dev)) { | |
76 | /* Read Graphics Base of Stolen Memory directly */ | |
9797fbfb | 77 | pci_read_config_dword(pdev, 0xA4, &base); |
e12a2d53 CW |
78 | #if 0 |
79 | } else if (IS_GEN3(dev)) { | |
9797fbfb | 80 | u8 val; |
e12a2d53 | 81 | /* Stolen is immediately below Top of Low Usable DRAM */ |
9797fbfb CW |
82 | pci_read_config_byte(pdev, 0x9c, &val); |
83 | base = val >> 3 << 27; | |
e12a2d53 CW |
84 | base -= dev_priv->mm.gtt->stolen_size; |
85 | } else { | |
86 | /* Stolen is immediately above Top of Memory */ | |
87 | base = max_low_pfn_mapped << PAGE_SHIFT; | |
9797fbfb | 88 | #endif |
e12a2d53 | 89 | } |
9797fbfb | 90 | |
e12a2d53 | 91 | return base; |
9797fbfb CW |
92 | } |
93 | ||
11be49eb | 94 | static int i915_setup_compression(struct drm_device *dev, int size) |
9797fbfb CW |
95 | { |
96 | struct drm_i915_private *dev_priv = dev->dev_private; | |
97 | struct drm_mm_node *compressed_fb, *uninitialized_var(compressed_llb); | |
9797fbfb | 98 | |
11be49eb CW |
99 | /* Try to over-allocate to reduce reallocations and fragmentation */ |
100 | compressed_fb = drm_mm_search_free(&dev_priv->mm.stolen, | |
101 | size <<= 1, 4096, 0); | |
102 | if (!compressed_fb) | |
103 | compressed_fb = drm_mm_search_free(&dev_priv->mm.stolen, | |
104 | size >>= 1, 4096, 0); | |
9797fbfb CW |
105 | if (compressed_fb) |
106 | compressed_fb = drm_mm_get_block(compressed_fb, size, 4096); | |
107 | if (!compressed_fb) | |
108 | goto err; | |
109 | ||
11be49eb CW |
110 | if (HAS_PCH_SPLIT(dev)) |
111 | I915_WRITE(ILK_DPFC_CB_BASE, compressed_fb->start); | |
112 | else if (IS_GM45(dev)) { | |
113 | I915_WRITE(DPFC_CB_BASE, compressed_fb->start); | |
114 | } else { | |
9797fbfb CW |
115 | compressed_llb = drm_mm_search_free(&dev_priv->mm.stolen, |
116 | 4096, 4096, 0); | |
117 | if (compressed_llb) | |
118 | compressed_llb = drm_mm_get_block(compressed_llb, | |
119 | 4096, 4096); | |
120 | if (!compressed_llb) | |
121 | goto err_fb; | |
122 | ||
11be49eb CW |
123 | dev_priv->compressed_llb = compressed_llb; |
124 | ||
125 | I915_WRITE(FBC_CFB_BASE, | |
126 | dev_priv->mm.stolen_base + compressed_fb->start); | |
127 | I915_WRITE(FBC_LL_BASE, | |
128 | dev_priv->mm.stolen_base + compressed_llb->start); | |
9797fbfb CW |
129 | } |
130 | ||
11be49eb | 131 | dev_priv->compressed_fb = compressed_fb; |
9797fbfb CW |
132 | dev_priv->cfb_size = size; |
133 | ||
11be49eb CW |
134 | DRM_DEBUG_KMS("reserved %d bytes of contiguous stolen space for FBC\n", |
135 | size); | |
9797fbfb | 136 | |
11be49eb | 137 | return 0; |
9797fbfb | 138 | |
9797fbfb CW |
139 | err_fb: |
140 | drm_mm_put_block(compressed_fb); | |
141 | err: | |
d8241785 | 142 | 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 |
143 | return -ENOSPC; |
144 | } | |
145 | ||
146 | int i915_gem_stolen_setup_compression(struct drm_device *dev, int size) | |
147 | { | |
148 | struct drm_i915_private *dev_priv = dev->dev_private; | |
149 | ||
446f8d81 | 150 | if (!drm_mm_initialized(&dev_priv->mm.stolen)) |
11be49eb CW |
151 | return -ENODEV; |
152 | ||
153 | if (size < dev_priv->cfb_size) | |
154 | return 0; | |
155 | ||
156 | /* Release any current block */ | |
157 | i915_gem_stolen_cleanup_compression(dev); | |
158 | ||
159 | return i915_setup_compression(dev, size); | |
9797fbfb CW |
160 | } |
161 | ||
11be49eb | 162 | void i915_gem_stolen_cleanup_compression(struct drm_device *dev) |
9797fbfb CW |
163 | { |
164 | struct drm_i915_private *dev_priv = dev->dev_private; | |
165 | ||
11be49eb CW |
166 | if (dev_priv->cfb_size == 0) |
167 | return; | |
168 | ||
169 | if (dev_priv->compressed_fb) | |
170 | drm_mm_put_block(dev_priv->compressed_fb); | |
171 | ||
9797fbfb CW |
172 | if (dev_priv->compressed_llb) |
173 | drm_mm_put_block(dev_priv->compressed_llb); | |
11be49eb CW |
174 | |
175 | dev_priv->cfb_size = 0; | |
9797fbfb CW |
176 | } |
177 | ||
178 | void i915_gem_cleanup_stolen(struct drm_device *dev) | |
179 | { | |
4d7bb011 DV |
180 | struct drm_i915_private *dev_priv = dev->dev_private; |
181 | ||
446f8d81 DV |
182 | if (!drm_mm_initialized(&dev_priv->mm.stolen)) |
183 | return; | |
184 | ||
11be49eb | 185 | i915_gem_stolen_cleanup_compression(dev); |
4d7bb011 | 186 | drm_mm_takedown(&dev_priv->mm.stolen); |
9797fbfb CW |
187 | } |
188 | ||
189 | int i915_gem_init_stolen(struct drm_device *dev) | |
190 | { | |
191 | struct drm_i915_private *dev_priv = dev->dev_private; | |
c9cddffc | 192 | int bios_reserved = 0; |
9797fbfb | 193 | |
e12a2d53 CW |
194 | dev_priv->mm.stolen_base = i915_stolen_to_physical(dev); |
195 | if (dev_priv->mm.stolen_base == 0) | |
196 | return 0; | |
197 | ||
a54c0c27 BW |
198 | DRM_DEBUG_KMS("found %zd bytes of stolen memory at %08lx\n", |
199 | dev_priv->gtt.stolen_size, dev_priv->mm.stolen_base); | |
e12a2d53 | 200 | |
c9cddffc JB |
201 | if (IS_VALLEYVIEW(dev)) |
202 | bios_reserved = 1024*1024; /* top 1M on VLV/BYT */ | |
203 | ||
9797fbfb | 204 | /* Basic memrange allocator for stolen space */ |
c9cddffc JB |
205 | drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->gtt.stolen_size - |
206 | bios_reserved); | |
9797fbfb CW |
207 | |
208 | return 0; | |
209 | } | |
0104fdbb CW |
210 | |
211 | static struct sg_table * | |
212 | i915_pages_create_for_stolen(struct drm_device *dev, | |
213 | u32 offset, u32 size) | |
214 | { | |
215 | struct drm_i915_private *dev_priv = dev->dev_private; | |
216 | struct sg_table *st; | |
217 | struct scatterlist *sg; | |
218 | ||
219 | DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size); | |
a54c0c27 | 220 | BUG_ON(offset > dev_priv->gtt.stolen_size - size); |
0104fdbb CW |
221 | |
222 | /* We hide that we have no struct page backing our stolen object | |
223 | * by wrapping the contiguous physical allocation with a fake | |
224 | * dma mapping in a single scatterlist. | |
225 | */ | |
226 | ||
227 | st = kmalloc(sizeof(*st), GFP_KERNEL); | |
228 | if (st == NULL) | |
229 | return NULL; | |
230 | ||
231 | if (sg_alloc_table(st, 1, GFP_KERNEL)) { | |
232 | kfree(st); | |
233 | return NULL; | |
234 | } | |
235 | ||
236 | sg = st->sgl; | |
ed23abdd ID |
237 | sg->offset = offset; |
238 | sg->length = size; | |
0104fdbb CW |
239 | |
240 | sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset; | |
241 | sg_dma_len(sg) = size; | |
242 | ||
243 | return st; | |
244 | } | |
245 | ||
246 | static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj) | |
247 | { | |
248 | BUG(); | |
249 | return -EINVAL; | |
250 | } | |
251 | ||
252 | static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj) | |
253 | { | |
254 | /* Should only be called during free */ | |
255 | sg_free_table(obj->pages); | |
256 | kfree(obj->pages); | |
257 | } | |
258 | ||
259 | static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = { | |
260 | .get_pages = i915_gem_object_get_pages_stolen, | |
261 | .put_pages = i915_gem_object_put_pages_stolen, | |
262 | }; | |
263 | ||
264 | static struct drm_i915_gem_object * | |
265 | _i915_gem_object_create_stolen(struct drm_device *dev, | |
266 | struct drm_mm_node *stolen) | |
267 | { | |
268 | struct drm_i915_gem_object *obj; | |
269 | ||
42dcedd4 | 270 | obj = i915_gem_object_alloc(dev); |
0104fdbb CW |
271 | if (obj == NULL) |
272 | return NULL; | |
273 | ||
274 | if (drm_gem_private_object_init(dev, &obj->base, stolen->size)) | |
275 | goto cleanup; | |
276 | ||
277 | i915_gem_object_init(obj, &i915_gem_object_stolen_ops); | |
278 | ||
279 | obj->pages = i915_pages_create_for_stolen(dev, | |
280 | stolen->start, stolen->size); | |
281 | if (obj->pages == NULL) | |
282 | goto cleanup; | |
283 | ||
284 | obj->has_dma_mapping = true; | |
dd53e1b0 | 285 | i915_gem_object_pin_pages(obj); |
0104fdbb CW |
286 | obj->stolen = stolen; |
287 | ||
288 | obj->base.write_domain = I915_GEM_DOMAIN_GTT; | |
289 | obj->base.read_domains = I915_GEM_DOMAIN_GTT; | |
290 | obj->cache_level = I915_CACHE_NONE; | |
291 | ||
292 | return obj; | |
293 | ||
294 | cleanup: | |
42dcedd4 | 295 | i915_gem_object_free(obj); |
0104fdbb CW |
296 | return NULL; |
297 | } | |
298 | ||
299 | struct drm_i915_gem_object * | |
300 | i915_gem_object_create_stolen(struct drm_device *dev, u32 size) | |
301 | { | |
302 | struct drm_i915_private *dev_priv = dev->dev_private; | |
303 | struct drm_i915_gem_object *obj; | |
304 | struct drm_mm_node *stolen; | |
305 | ||
446f8d81 | 306 | if (!drm_mm_initialized(&dev_priv->mm.stolen)) |
0104fdbb CW |
307 | return NULL; |
308 | ||
309 | DRM_DEBUG_KMS("creating stolen object: size=%x\n", size); | |
310 | if (size == 0) | |
311 | return NULL; | |
312 | ||
313 | stolen = drm_mm_search_free(&dev_priv->mm.stolen, size, 4096, 0); | |
314 | if (stolen) | |
315 | stolen = drm_mm_get_block(stolen, size, 4096); | |
316 | if (stolen == NULL) | |
317 | return NULL; | |
318 | ||
319 | obj = _i915_gem_object_create_stolen(dev, stolen); | |
320 | if (obj) | |
321 | return obj; | |
322 | ||
323 | drm_mm_put_block(stolen); | |
324 | return NULL; | |
325 | } | |
326 | ||
866d12b4 CW |
327 | struct drm_i915_gem_object * |
328 | i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev, | |
329 | u32 stolen_offset, | |
330 | u32 gtt_offset, | |
331 | u32 size) | |
332 | { | |
333 | struct drm_i915_private *dev_priv = dev->dev_private; | |
334 | struct drm_i915_gem_object *obj; | |
335 | struct drm_mm_node *stolen; | |
336 | ||
446f8d81 | 337 | if (!drm_mm_initialized(&dev_priv->mm.stolen)) |
866d12b4 CW |
338 | return NULL; |
339 | ||
340 | DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n", | |
341 | stolen_offset, gtt_offset, size); | |
342 | ||
343 | /* KISS and expect everything to be page-aligned */ | |
344 | BUG_ON(stolen_offset & 4095); | |
866d12b4 CW |
345 | BUG_ON(size & 4095); |
346 | ||
347 | if (WARN_ON(size == 0)) | |
348 | return NULL; | |
349 | ||
350 | stolen = drm_mm_create_block(&dev_priv->mm.stolen, | |
351 | stolen_offset, size, | |
352 | false); | |
353 | if (stolen == NULL) { | |
354 | DRM_DEBUG_KMS("failed to allocate stolen space\n"); | |
355 | return NULL; | |
356 | } | |
357 | ||
358 | obj = _i915_gem_object_create_stolen(dev, stolen); | |
359 | if (obj == NULL) { | |
360 | DRM_DEBUG_KMS("failed to allocate stolen object\n"); | |
361 | drm_mm_put_block(stolen); | |
362 | return NULL; | |
363 | } | |
364 | ||
3727d55e JB |
365 | /* Some objects just need physical mem from stolen space */ |
366 | if (gtt_offset == -1) | |
367 | return obj; | |
368 | ||
866d12b4 CW |
369 | /* To simplify the initialisation sequence between KMS and GTT, |
370 | * we allow construction of the stolen object prior to | |
371 | * setting up the GTT space. The actual reservation will occur | |
372 | * later. | |
373 | */ | |
374 | if (drm_mm_initialized(&dev_priv->mm.gtt_space)) { | |
375 | obj->gtt_space = drm_mm_create_block(&dev_priv->mm.gtt_space, | |
376 | gtt_offset, size, | |
377 | false); | |
378 | if (obj->gtt_space == NULL) { | |
379 | DRM_DEBUG_KMS("failed to allocate stolen GTT space\n"); | |
380 | drm_gem_object_unreference(&obj->base); | |
381 | return NULL; | |
382 | } | |
383 | } else | |
384 | obj->gtt_space = I915_GTT_RESERVED; | |
385 | ||
386 | obj->gtt_offset = gtt_offset; | |
387 | obj->has_global_gtt_mapping = 1; | |
388 | ||
35c20a60 | 389 | list_add_tail(&obj->global_list, &dev_priv->mm.bound_list); |
866d12b4 CW |
390 | list_add_tail(&obj->mm_list, &dev_priv->mm.inactive_list); |
391 | ||
392 | return obj; | |
393 | } | |
394 | ||
0104fdbb CW |
395 | void |
396 | i915_gem_object_release_stolen(struct drm_i915_gem_object *obj) | |
397 | { | |
398 | if (obj->stolen) { | |
399 | drm_mm_put_block(obj->stolen); | |
400 | obj->stolen = NULL; | |
401 | } | |
402 | } |