Commit | Line | Data |
---|---|---|
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); | |
9797fbfb | 115 | |
11be49eb CW |
116 | /* Try to over-allocate to reduce reallocations and fragmentation */ |
117 | compressed_fb = drm_mm_search_free(&dev_priv->mm.stolen, | |
118 | size <<= 1, 4096, 0); | |
119 | if (!compressed_fb) | |
120 | compressed_fb = drm_mm_search_free(&dev_priv->mm.stolen, | |
121 | size >>= 1, 4096, 0); | |
9797fbfb CW |
122 | if (compressed_fb) |
123 | compressed_fb = drm_mm_get_block(compressed_fb, size, 4096); | |
124 | if (!compressed_fb) | |
125 | goto err; | |
126 | ||
11be49eb CW |
127 | if (HAS_PCH_SPLIT(dev)) |
128 | I915_WRITE(ILK_DPFC_CB_BASE, compressed_fb->start); | |
129 | else if (IS_GM45(dev)) { | |
130 | I915_WRITE(DPFC_CB_BASE, compressed_fb->start); | |
131 | } else { | |
9797fbfb CW |
132 | compressed_llb = drm_mm_search_free(&dev_priv->mm.stolen, |
133 | 4096, 4096, 0); | |
134 | if (compressed_llb) | |
135 | compressed_llb = drm_mm_get_block(compressed_llb, | |
136 | 4096, 4096); | |
137 | if (!compressed_llb) | |
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 CW |
156 | err_fb: |
157 | drm_mm_put_block(compressed_fb); | |
158 | err: | |
d8241785 | 159 | 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 |
160 | return -ENOSPC; |
161 | } | |
162 | ||
163 | int i915_gem_stolen_setup_compression(struct drm_device *dev, int size) | |
164 | { | |
165 | struct drm_i915_private *dev_priv = dev->dev_private; | |
166 | ||
167 | if (dev_priv->mm.stolen_base == 0) | |
168 | return -ENODEV; | |
169 | ||
5c3fe8b0 | 170 | if (size < dev_priv->fbc.size) |
11be49eb CW |
171 | return 0; |
172 | ||
173 | /* Release any current block */ | |
174 | i915_gem_stolen_cleanup_compression(dev); | |
175 | ||
176 | return i915_setup_compression(dev, size); | |
9797fbfb CW |
177 | } |
178 | ||
11be49eb | 179 | void i915_gem_stolen_cleanup_compression(struct drm_device *dev) |
9797fbfb CW |
180 | { |
181 | struct drm_i915_private *dev_priv = dev->dev_private; | |
182 | ||
5c3fe8b0 | 183 | if (dev_priv->fbc.size == 0) |
11be49eb CW |
184 | return; |
185 | ||
5c3fe8b0 BW |
186 | if (dev_priv->fbc.compressed_fb) |
187 | drm_mm_put_block(dev_priv->fbc.compressed_fb); | |
11be49eb | 188 | |
5c3fe8b0 BW |
189 | if (dev_priv->fbc.compressed_llb) |
190 | drm_mm_put_block(dev_priv->fbc.compressed_llb); | |
11be49eb | 191 | |
5c3fe8b0 | 192 | dev_priv->fbc.size = 0; |
9797fbfb CW |
193 | } |
194 | ||
195 | void i915_gem_cleanup_stolen(struct drm_device *dev) | |
196 | { | |
4d7bb011 DV |
197 | struct drm_i915_private *dev_priv = dev->dev_private; |
198 | ||
11be49eb | 199 | i915_gem_stolen_cleanup_compression(dev); |
4d7bb011 | 200 | drm_mm_takedown(&dev_priv->mm.stolen); |
9797fbfb CW |
201 | } |
202 | ||
203 | int i915_gem_init_stolen(struct drm_device *dev) | |
204 | { | |
205 | struct drm_i915_private *dev_priv = dev->dev_private; | |
c9cddffc | 206 | int bios_reserved = 0; |
9797fbfb | 207 | |
e12a2d53 CW |
208 | dev_priv->mm.stolen_base = i915_stolen_to_physical(dev); |
209 | if (dev_priv->mm.stolen_base == 0) | |
210 | return 0; | |
211 | ||
a54c0c27 BW |
212 | DRM_DEBUG_KMS("found %zd bytes of stolen memory at %08lx\n", |
213 | dev_priv->gtt.stolen_size, dev_priv->mm.stolen_base); | |
e12a2d53 | 214 | |
c9cddffc JB |
215 | if (IS_VALLEYVIEW(dev)) |
216 | bios_reserved = 1024*1024; /* top 1M on VLV/BYT */ | |
217 | ||
897f9ed0 DV |
218 | if (WARN_ON(bios_reserved > dev_priv->gtt.stolen_size)) |
219 | return 0; | |
220 | ||
9797fbfb | 221 | /* Basic memrange allocator for stolen space */ |
c9cddffc JB |
222 | drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->gtt.stolen_size - |
223 | bios_reserved); | |
9797fbfb CW |
224 | |
225 | return 0; | |
226 | } | |
0104fdbb CW |
227 | |
228 | static struct sg_table * | |
229 | i915_pages_create_for_stolen(struct drm_device *dev, | |
230 | u32 offset, u32 size) | |
231 | { | |
232 | struct drm_i915_private *dev_priv = dev->dev_private; | |
233 | struct sg_table *st; | |
234 | struct scatterlist *sg; | |
235 | ||
236 | DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size); | |
a54c0c27 | 237 | BUG_ON(offset > dev_priv->gtt.stolen_size - size); |
0104fdbb CW |
238 | |
239 | /* We hide that we have no struct page backing our stolen object | |
240 | * by wrapping the contiguous physical allocation with a fake | |
241 | * dma mapping in a single scatterlist. | |
242 | */ | |
243 | ||
244 | st = kmalloc(sizeof(*st), GFP_KERNEL); | |
245 | if (st == NULL) | |
246 | return NULL; | |
247 | ||
248 | if (sg_alloc_table(st, 1, GFP_KERNEL)) { | |
249 | kfree(st); | |
250 | return NULL; | |
251 | } | |
252 | ||
253 | sg = st->sgl; | |
ed23abdd ID |
254 | sg->offset = offset; |
255 | sg->length = size; | |
0104fdbb CW |
256 | |
257 | sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset; | |
258 | sg_dma_len(sg) = size; | |
259 | ||
260 | return st; | |
261 | } | |
262 | ||
263 | static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj) | |
264 | { | |
265 | BUG(); | |
266 | return -EINVAL; | |
267 | } | |
268 | ||
269 | static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj) | |
270 | { | |
271 | /* Should only be called during free */ | |
272 | sg_free_table(obj->pages); | |
273 | kfree(obj->pages); | |
274 | } | |
275 | ||
276 | static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = { | |
277 | .get_pages = i915_gem_object_get_pages_stolen, | |
278 | .put_pages = i915_gem_object_put_pages_stolen, | |
279 | }; | |
280 | ||
281 | static struct drm_i915_gem_object * | |
282 | _i915_gem_object_create_stolen(struct drm_device *dev, | |
283 | struct drm_mm_node *stolen) | |
284 | { | |
285 | struct drm_i915_gem_object *obj; | |
286 | ||
42dcedd4 | 287 | obj = i915_gem_object_alloc(dev); |
0104fdbb CW |
288 | if (obj == NULL) |
289 | return NULL; | |
290 | ||
291 | if (drm_gem_private_object_init(dev, &obj->base, stolen->size)) | |
292 | goto cleanup; | |
293 | ||
294 | i915_gem_object_init(obj, &i915_gem_object_stolen_ops); | |
295 | ||
296 | obj->pages = i915_pages_create_for_stolen(dev, | |
297 | stolen->start, stolen->size); | |
298 | if (obj->pages == NULL) | |
299 | goto cleanup; | |
300 | ||
301 | obj->has_dma_mapping = true; | |
dd53e1b0 | 302 | i915_gem_object_pin_pages(obj); |
0104fdbb CW |
303 | obj->stolen = stolen; |
304 | ||
305 | obj->base.write_domain = I915_GEM_DOMAIN_GTT; | |
306 | obj->base.read_domains = I915_GEM_DOMAIN_GTT; | |
307 | obj->cache_level = I915_CACHE_NONE; | |
308 | ||
309 | return obj; | |
310 | ||
311 | cleanup: | |
42dcedd4 | 312 | i915_gem_object_free(obj); |
0104fdbb CW |
313 | return NULL; |
314 | } | |
315 | ||
316 | struct drm_i915_gem_object * | |
317 | i915_gem_object_create_stolen(struct drm_device *dev, u32 size) | |
318 | { | |
319 | struct drm_i915_private *dev_priv = dev->dev_private; | |
320 | struct drm_i915_gem_object *obj; | |
321 | struct drm_mm_node *stolen; | |
322 | ||
323 | if (dev_priv->mm.stolen_base == 0) | |
324 | return NULL; | |
325 | ||
326 | DRM_DEBUG_KMS("creating stolen object: size=%x\n", size); | |
327 | if (size == 0) | |
328 | return NULL; | |
329 | ||
330 | stolen = drm_mm_search_free(&dev_priv->mm.stolen, size, 4096, 0); | |
331 | if (stolen) | |
332 | stolen = drm_mm_get_block(stolen, size, 4096); | |
333 | if (stolen == NULL) | |
334 | return NULL; | |
335 | ||
336 | obj = _i915_gem_object_create_stolen(dev, stolen); | |
337 | if (obj) | |
338 | return obj; | |
339 | ||
340 | drm_mm_put_block(stolen); | |
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; | |
5cef07e1 | 351 | struct i915_address_space *vm = &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 CW |
356 | |
357 | if (dev_priv->mm.stolen_base == 0) | |
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"); | |
386 | drm_mm_put_block(stolen); | |
387 | return NULL; | |
388 | } | |
389 | ||
3727d55e | 390 | /* Some objects just need physical mem from stolen space */ |
190d6cd5 | 391 | if (gtt_offset == I915_GTT_OFFSET_NONE) |
3727d55e JB |
392 | return obj; |
393 | ||
2f633156 BW |
394 | vma = i915_gem_vma_create(obj, &dev_priv->gtt.base); |
395 | if (!vma) { | |
396 | ret = -ENOMEM; | |
397 | goto err_out; | |
398 | } | |
399 | ||
866d12b4 CW |
400 | /* To simplify the initialisation sequence between KMS and GTT, |
401 | * we allow construction of the stolen object prior to | |
402 | * setting up the GTT space. The actual reservation will occur | |
403 | * later. | |
404 | */ | |
2f633156 BW |
405 | vma->node.start = gtt_offset; |
406 | vma->node.size = size; | |
93bd8649 | 407 | if (drm_mm_initialized(&dev_priv->gtt.base.mm)) { |
2f633156 | 408 | ret = drm_mm_reserve_node(&dev_priv->gtt.base.mm, &vma->node); |
b3a070cc | 409 | if (ret) { |
866d12b4 | 410 | DRM_DEBUG_KMS("failed to allocate stolen GTT space\n"); |
2f633156 | 411 | i915_gem_vma_destroy(vma); |
f7f18184 | 412 | goto err_out; |
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); |
5cef07e1 | 419 | list_add_tail(&obj->mm_list, &vm->inactive_list); |
866d12b4 CW |
420 | |
421 | return obj; | |
b3a070cc | 422 | |
f7f18184 BW |
423 | err_out: |
424 | drm_mm_put_block(stolen); | |
b3a070cc BW |
425 | drm_gem_object_unreference(&obj->base); |
426 | return NULL; | |
866d12b4 CW |
427 | } |
428 | ||
0104fdbb CW |
429 | void |
430 | i915_gem_object_release_stolen(struct drm_i915_gem_object *obj) | |
431 | { | |
432 | if (obj->stolen) { | |
433 | drm_mm_put_block(obj->stolen); | |
434 | obj->stolen = NULL; | |
435 | } | |
436 | } |