i915_gem_stolen.c 11 KB

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  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. #include <drm/drmP.h>
  29. #include <drm/i915_drm.h>
  30. #include "i915_drv.h"
  31. /*
  32. * The BIOS typically reserves some of the system's memory for the exclusive
  33. * use of the integrated graphics. This memory is no longer available for
  34. * use by the OS and so the user finds that his system has less memory
  35. * available than he put in. We refer to this memory as stolen.
  36. *
  37. * The BIOS will allocate its framebuffer from the stolen memory. Our
  38. * goal is try to reuse that object for our own fbcon which must always
  39. * be available for panics. Anything else we can reuse the stolen memory
  40. * for is a boon.
  41. */
  42. static unsigned long i915_stolen_to_physical(struct drm_device *dev)
  43. {
  44. struct drm_i915_private *dev_priv = dev->dev_private;
  45. struct pci_dev *pdev = dev_priv->bridge_dev;
  46. u32 base;
  47. /* On the machines I have tested the Graphics Base of Stolen Memory
  48. * is unreliable, so on those compute the base by subtracting the
  49. * stolen memory from the Top of Low Usable DRAM which is where the
  50. * BIOS places the graphics stolen memory.
  51. *
  52. * On gen2, the layout is slightly different with the Graphics Segment
  53. * immediately following Top of Memory (or Top of Usable DRAM). Note
  54. * it appears that TOUD is only reported by 865g, so we just use the
  55. * top of memory as determined by the e820 probe.
  56. *
  57. * XXX gen2 requires an unavailable symbol and 945gm fails with
  58. * its value of TOLUD.
  59. */
  60. base = 0;
  61. if (IS_VALLEYVIEW(dev)) {
  62. pci_read_config_dword(dev->pdev, 0x5c, &base);
  63. base &= ~((1<<20) - 1);
  64. } else if (INTEL_INFO(dev)->gen >= 6) {
  65. /* Read Base Data of Stolen Memory Register (BDSM) directly.
  66. * Note that there is also a MCHBAR miror at 0x1080c0 or
  67. * we could use device 2:0x5c instead.
  68. */
  69. pci_read_config_dword(pdev, 0xB0, &base);
  70. base &= ~4095; /* lower bits used for locking register */
  71. } else if (INTEL_INFO(dev)->gen > 3 || IS_G33(dev)) {
  72. /* Read Graphics Base of Stolen Memory directly */
  73. pci_read_config_dword(pdev, 0xA4, &base);
  74. #if 0
  75. } else if (IS_GEN3(dev)) {
  76. u8 val;
  77. /* Stolen is immediately below Top of Low Usable DRAM */
  78. pci_read_config_byte(pdev, 0x9c, &val);
  79. base = val >> 3 << 27;
  80. base -= dev_priv->mm.gtt->stolen_size;
  81. } else {
  82. /* Stolen is immediately above Top of Memory */
  83. base = max_low_pfn_mapped << PAGE_SHIFT;
  84. #endif
  85. }
  86. return base;
  87. }
  88. static int i915_setup_compression(struct drm_device *dev, int size)
  89. {
  90. struct drm_i915_private *dev_priv = dev->dev_private;
  91. struct drm_mm_node *compressed_fb, *uninitialized_var(compressed_llb);
  92. /* Try to over-allocate to reduce reallocations and fragmentation */
  93. compressed_fb = drm_mm_search_free(&dev_priv->mm.stolen,
  94. size <<= 1, 4096, 0);
  95. if (!compressed_fb)
  96. compressed_fb = drm_mm_search_free(&dev_priv->mm.stolen,
  97. size >>= 1, 4096, 0);
  98. if (compressed_fb)
  99. compressed_fb = drm_mm_get_block(compressed_fb, size, 4096);
  100. if (!compressed_fb)
  101. goto err;
  102. if (HAS_PCH_SPLIT(dev))
  103. I915_WRITE(ILK_DPFC_CB_BASE, compressed_fb->start);
  104. else if (IS_GM45(dev)) {
  105. I915_WRITE(DPFC_CB_BASE, compressed_fb->start);
  106. } else {
  107. compressed_llb = drm_mm_search_free(&dev_priv->mm.stolen,
  108. 4096, 4096, 0);
  109. if (compressed_llb)
  110. compressed_llb = drm_mm_get_block(compressed_llb,
  111. 4096, 4096);
  112. if (!compressed_llb)
  113. goto err_fb;
  114. dev_priv->compressed_llb = compressed_llb;
  115. I915_WRITE(FBC_CFB_BASE,
  116. dev_priv->mm.stolen_base + compressed_fb->start);
  117. I915_WRITE(FBC_LL_BASE,
  118. dev_priv->mm.stolen_base + compressed_llb->start);
  119. }
  120. dev_priv->compressed_fb = compressed_fb;
  121. dev_priv->cfb_size = size;
  122. DRM_DEBUG_KMS("reserved %d bytes of contiguous stolen space for FBC\n",
  123. size);
  124. return 0;
  125. err_fb:
  126. drm_mm_put_block(compressed_fb);
  127. err:
  128. 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);
  129. return -ENOSPC;
  130. }
  131. int i915_gem_stolen_setup_compression(struct drm_device *dev, int size)
  132. {
  133. struct drm_i915_private *dev_priv = dev->dev_private;
  134. if (dev_priv->mm.stolen_base == 0)
  135. return -ENODEV;
  136. if (size < dev_priv->cfb_size)
  137. return 0;
  138. /* Release any current block */
  139. i915_gem_stolen_cleanup_compression(dev);
  140. return i915_setup_compression(dev, size);
  141. }
  142. void i915_gem_stolen_cleanup_compression(struct drm_device *dev)
  143. {
  144. struct drm_i915_private *dev_priv = dev->dev_private;
  145. if (dev_priv->cfb_size == 0)
  146. return;
  147. if (dev_priv->compressed_fb)
  148. drm_mm_put_block(dev_priv->compressed_fb);
  149. if (dev_priv->compressed_llb)
  150. drm_mm_put_block(dev_priv->compressed_llb);
  151. dev_priv->cfb_size = 0;
  152. }
  153. void i915_gem_cleanup_stolen(struct drm_device *dev)
  154. {
  155. struct drm_i915_private *dev_priv = dev->dev_private;
  156. i915_gem_stolen_cleanup_compression(dev);
  157. drm_mm_takedown(&dev_priv->mm.stolen);
  158. }
  159. int i915_gem_init_stolen(struct drm_device *dev)
  160. {
  161. struct drm_i915_private *dev_priv = dev->dev_private;
  162. int bios_reserved = 0;
  163. dev_priv->mm.stolen_base = i915_stolen_to_physical(dev);
  164. if (dev_priv->mm.stolen_base == 0)
  165. return 0;
  166. DRM_DEBUG_KMS("found %zd bytes of stolen memory at %08lx\n",
  167. dev_priv->gtt.stolen_size, dev_priv->mm.stolen_base);
  168. if (IS_VALLEYVIEW(dev))
  169. bios_reserved = 1024*1024; /* top 1M on VLV/BYT */
  170. /* Basic memrange allocator for stolen space */
  171. drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->gtt.stolen_size -
  172. bios_reserved);
  173. return 0;
  174. }
  175. static struct sg_table *
  176. i915_pages_create_for_stolen(struct drm_device *dev,
  177. u32 offset, u32 size)
  178. {
  179. struct drm_i915_private *dev_priv = dev->dev_private;
  180. struct sg_table *st;
  181. struct scatterlist *sg;
  182. DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size);
  183. BUG_ON(offset > dev_priv->gtt.stolen_size - size);
  184. /* We hide that we have no struct page backing our stolen object
  185. * by wrapping the contiguous physical allocation with a fake
  186. * dma mapping in a single scatterlist.
  187. */
  188. st = kmalloc(sizeof(*st), GFP_KERNEL);
  189. if (st == NULL)
  190. return NULL;
  191. if (sg_alloc_table(st, 1, GFP_KERNEL)) {
  192. kfree(st);
  193. return NULL;
  194. }
  195. sg = st->sgl;
  196. sg->offset = offset;
  197. sg->length = size;
  198. sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset;
  199. sg_dma_len(sg) = size;
  200. return st;
  201. }
  202. static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
  203. {
  204. BUG();
  205. return -EINVAL;
  206. }
  207. static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj)
  208. {
  209. /* Should only be called during free */
  210. sg_free_table(obj->pages);
  211. kfree(obj->pages);
  212. }
  213. static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
  214. .get_pages = i915_gem_object_get_pages_stolen,
  215. .put_pages = i915_gem_object_put_pages_stolen,
  216. };
  217. static struct drm_i915_gem_object *
  218. _i915_gem_object_create_stolen(struct drm_device *dev,
  219. struct drm_mm_node *stolen)
  220. {
  221. struct drm_i915_gem_object *obj;
  222. obj = i915_gem_object_alloc(dev);
  223. if (obj == NULL)
  224. return NULL;
  225. if (drm_gem_private_object_init(dev, &obj->base, stolen->size))
  226. goto cleanup;
  227. i915_gem_object_init(obj, &i915_gem_object_stolen_ops);
  228. obj->pages = i915_pages_create_for_stolen(dev,
  229. stolen->start, stolen->size);
  230. if (obj->pages == NULL)
  231. goto cleanup;
  232. obj->has_dma_mapping = true;
  233. i915_gem_object_pin_pages(obj);
  234. obj->stolen = stolen;
  235. obj->base.write_domain = I915_GEM_DOMAIN_GTT;
  236. obj->base.read_domains = I915_GEM_DOMAIN_GTT;
  237. obj->cache_level = I915_CACHE_NONE;
  238. return obj;
  239. cleanup:
  240. i915_gem_object_free(obj);
  241. return NULL;
  242. }
  243. struct drm_i915_gem_object *
  244. i915_gem_object_create_stolen(struct drm_device *dev, u32 size)
  245. {
  246. struct drm_i915_private *dev_priv = dev->dev_private;
  247. struct drm_i915_gem_object *obj;
  248. struct drm_mm_node *stolen;
  249. if (dev_priv->mm.stolen_base == 0)
  250. return NULL;
  251. DRM_DEBUG_KMS("creating stolen object: size=%x\n", size);
  252. if (size == 0)
  253. return NULL;
  254. stolen = drm_mm_search_free(&dev_priv->mm.stolen, size, 4096, 0);
  255. if (stolen)
  256. stolen = drm_mm_get_block(stolen, size, 4096);
  257. if (stolen == NULL)
  258. return NULL;
  259. obj = _i915_gem_object_create_stolen(dev, stolen);
  260. if (obj)
  261. return obj;
  262. drm_mm_put_block(stolen);
  263. return NULL;
  264. }
  265. struct drm_i915_gem_object *
  266. i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
  267. u32 stolen_offset,
  268. u32 gtt_offset,
  269. u32 size)
  270. {
  271. struct drm_i915_private *dev_priv = dev->dev_private;
  272. struct drm_i915_gem_object *obj;
  273. struct drm_mm_node *stolen;
  274. if (dev_priv->mm.stolen_base == 0)
  275. return NULL;
  276. DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n",
  277. stolen_offset, gtt_offset, size);
  278. /* KISS and expect everything to be page-aligned */
  279. BUG_ON(stolen_offset & 4095);
  280. BUG_ON(size & 4095);
  281. if (WARN_ON(size == 0))
  282. return NULL;
  283. stolen = drm_mm_create_block(&dev_priv->mm.stolen,
  284. stolen_offset, size,
  285. false);
  286. if (stolen == NULL) {
  287. DRM_DEBUG_KMS("failed to allocate stolen space\n");
  288. return NULL;
  289. }
  290. obj = _i915_gem_object_create_stolen(dev, stolen);
  291. if (obj == NULL) {
  292. DRM_DEBUG_KMS("failed to allocate stolen object\n");
  293. drm_mm_put_block(stolen);
  294. return NULL;
  295. }
  296. /* Some objects just need physical mem from stolen space */
  297. if (gtt_offset == -1)
  298. return obj;
  299. /* To simplify the initialisation sequence between KMS and GTT,
  300. * we allow construction of the stolen object prior to
  301. * setting up the GTT space. The actual reservation will occur
  302. * later.
  303. */
  304. if (drm_mm_initialized(&dev_priv->mm.gtt_space)) {
  305. obj->gtt_space = drm_mm_create_block(&dev_priv->mm.gtt_space,
  306. gtt_offset, size,
  307. false);
  308. if (obj->gtt_space == NULL) {
  309. DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
  310. drm_gem_object_unreference(&obj->base);
  311. return NULL;
  312. }
  313. } else
  314. obj->gtt_space = I915_GTT_RESERVED;
  315. obj->gtt_offset = gtt_offset;
  316. obj->has_global_gtt_mapping = 1;
  317. list_add_tail(&obj->global_list, &dev_priv->mm.bound_list);
  318. list_add_tail(&obj->mm_list, &dev_priv->mm.inactive_list);
  319. return obj;
  320. }
  321. void
  322. i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
  323. {
  324. if (obj->stolen) {
  325. drm_mm_put_block(obj->stolen);
  326. obj->stolen = NULL;
  327. }
  328. }