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 29 #include <drm/drmP.h> 30 #include <drm/i915_drm.h> 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 45 static unsigned long i915_stolen_to_physical(struct drm_device *dev) 46 { 47 struct drm_i915_private *dev_priv = dev->dev_private; 48 struct pci_dev *pdev = dev_priv->bridge_dev; 49 u32 base; 50 51 /* On the machines I have tested the Graphics Base of Stolen Memory 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. 63 */ 64 base = 0; 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) { 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 */ 77 pci_read_config_dword(pdev, 0xA4, &base); 78 #if 0 79 } else if (IS_GEN3(dev)) { 80 u8 val; 81 /* Stolen is immediately below Top of Low Usable DRAM */ 82 pci_read_config_byte(pdev, 0x9c, &val); 83 base = val >> 3 << 27; 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; 88 #endif 89 } 90 91 return base; 92 } 93 94 static int i915_setup_compression(struct drm_device *dev, int size) 95 { 96 struct drm_i915_private *dev_priv = dev->dev_private; 97 struct drm_mm_node *compressed_fb, *compressed_llb = NULL; 98 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); 105 if (compressed_fb) 106 compressed_fb = drm_mm_get_block(compressed_fb, size, 4096); 107 if (!compressed_fb) 108 goto err; 109 110 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 { 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; 122 123 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); 129 } 130 131 dev_priv->compressed_fb = compressed_fb; 132 dev_priv->cfb_size = size; 133 134 DRM_DEBUG_KMS("reserved %d bytes of contiguous stolen space for FBC\n", 135 size); 136 137 return 0; 138 139 err_fb: 140 drm_mm_put_block(compressed_fb); 141 err: 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); 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; 149 150 if (!drm_mm_initialized(&dev_priv->mm.stolen)) 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); 160 } 161 162 void i915_gem_stolen_cleanup_compression(struct drm_device *dev) 163 { 164 struct drm_i915_private *dev_priv = dev->dev_private; 165 166 if (dev_priv->cfb_size == 0) 167 return; 168 169 if (dev_priv->compressed_fb) 170 drm_mm_put_block(dev_priv->compressed_fb); 171 172 if (dev_priv->compressed_llb) 173 drm_mm_put_block(dev_priv->compressed_llb); 174 175 dev_priv->cfb_size = 0; 176 } 177 178 void i915_gem_cleanup_stolen(struct drm_device *dev) 179 { 180 struct drm_i915_private *dev_priv = dev->dev_private; 181 182 if (!drm_mm_initialized(&dev_priv->mm.stolen)) 183 return; 184 185 i915_gem_stolen_cleanup_compression(dev); 186 drm_mm_takedown(&dev_priv->mm.stolen); 187 } 188 189 int i915_gem_init_stolen(struct drm_device *dev) 190 { 191 struct drm_i915_private *dev_priv = dev->dev_private; 192 int bios_reserved = 0; 193 194 dev_priv->mm.stolen_base = i915_stolen_to_physical(dev); 195 if (dev_priv->mm.stolen_base == 0) 196 return 0; 197 198 DRM_DEBUG_KMS("found %zd bytes of stolen memory at %08lx\n", 199 dev_priv->gtt.stolen_size, dev_priv->mm.stolen_base); 200 201 if (IS_VALLEYVIEW(dev)) 202 bios_reserved = 1024*1024; /* top 1M on VLV/BYT */ 203 204 /* Basic memrange allocator for stolen space */ 205 drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->gtt.stolen_size - 206 bios_reserved); 207 208 return 0; 209 } 210 211 static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj) 212 { 213 BUG(); 214 return -EINVAL; 215 } 216 217 static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj) 218 { 219 #if 0 220 /* Should only be called during free */ 221 sg_free_table(obj->pages); 222 kfree(obj->pages); 223 #else 224 BUG(); 225 #endif 226 } 227 228 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = { 229 .get_pages = i915_gem_object_get_pages_stolen, 230 .put_pages = i915_gem_object_put_pages_stolen, 231 }; 232 233 static struct drm_i915_gem_object * 234 _i915_gem_object_create_stolen(struct drm_device *dev, 235 struct drm_mm_node *stolen) 236 { 237 struct drm_i915_gem_object *obj; 238 239 #if 0 240 obj = i915_gem_object_alloc(dev); 241 #else 242 obj = NULL; 243 #endif 244 if (obj == NULL) 245 return NULL; 246 247 if (drm_gem_private_object_init(dev, &obj->base, stolen->size)) 248 goto cleanup; 249 250 i915_gem_object_init(obj, &i915_gem_object_stolen_ops); 251 252 #if 0 253 obj->pages = i915_pages_create_for_stolen(dev, 254 stolen->start, stolen->size); 255 #else 256 obj->pages = NULL; 257 #endif 258 if (obj->pages == NULL) 259 goto cleanup; 260 261 obj->has_dma_mapping = true; 262 i915_gem_object_pin_pages(obj); 263 obj->stolen = stolen; 264 265 obj->base.write_domain = I915_GEM_DOMAIN_GTT; 266 obj->base.read_domains = I915_GEM_DOMAIN_GTT; 267 obj->cache_level = I915_CACHE_NONE; 268 269 return obj; 270 271 cleanup: 272 i915_gem_object_free(obj); 273 return NULL; 274 } 275 276 struct drm_i915_gem_object * 277 i915_gem_object_create_stolen(struct drm_device *dev, u32 size) 278 { 279 struct drm_i915_private *dev_priv = dev->dev_private; 280 struct drm_i915_gem_object *obj; 281 struct drm_mm_node *stolen; 282 283 if (!drm_mm_initialized(&dev_priv->mm.stolen)) 284 return NULL; 285 286 DRM_DEBUG_KMS("creating stolen object: size=%x\n", size); 287 if (size == 0) 288 return NULL; 289 290 stolen = drm_mm_search_free(&dev_priv->mm.stolen, size, 4096, 0); 291 if (stolen) 292 stolen = drm_mm_get_block(stolen, size, 4096); 293 if (stolen == NULL) 294 return NULL; 295 296 obj = _i915_gem_object_create_stolen(dev, stolen); 297 if (obj) 298 return obj; 299 300 drm_mm_put_block(stolen); 301 return NULL; 302 } 303 304 struct drm_i915_gem_object * 305 i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev, 306 u32 stolen_offset, 307 u32 gtt_offset, 308 u32 size) 309 { 310 struct drm_i915_private *dev_priv = dev->dev_private; 311 struct drm_i915_gem_object *obj; 312 struct drm_mm_node *stolen; 313 314 if (!drm_mm_initialized(&dev_priv->mm.stolen)) 315 return NULL; 316 317 DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n", 318 stolen_offset, gtt_offset, size); 319 320 /* KISS and expect everything to be page-aligned */ 321 BUG_ON(stolen_offset & 4095); 322 BUG_ON(size & 4095); 323 324 if (WARN_ON(size == 0)) 325 return NULL; 326 327 #if 0 328 stolen = drm_mm_create_block(&dev_priv->mm.stolen, 329 stolen_offset, size, 330 false); 331 #else 332 stolen = NULL; 333 #endif 334 if (stolen == NULL) { 335 DRM_DEBUG_KMS("failed to allocate stolen space\n"); 336 return NULL; 337 } 338 339 obj = _i915_gem_object_create_stolen(dev, stolen); 340 if (obj == NULL) { 341 DRM_DEBUG_KMS("failed to allocate stolen object\n"); 342 drm_mm_put_block(stolen); 343 return NULL; 344 } 345 346 /* Some objects just need physical mem from stolen space */ 347 if (gtt_offset == -1) 348 return obj; 349 350 #if 0 351 /* To simplify the initialisation sequence between KMS and GTT, 352 * we allow construction of the stolen object prior to 353 * setting up the GTT space. The actual reservation will occur 354 * later. 355 */ 356 if (drm_mm_initialized(&dev_priv->mm.gtt_space)) { 357 obj->gtt_space = drm_mm_create_block(&dev_priv->mm.gtt_space, 358 gtt_offset, size, 359 false); 360 if (obj->gtt_space == NULL) { 361 DRM_DEBUG_KMS("failed to allocate stolen GTT space\n"); 362 drm_gem_object_unreference(&obj->base); 363 return NULL; 364 } 365 } else 366 obj->gtt_space = I915_GTT_RESERVED; 367 368 obj->gtt_offset = gtt_offset; 369 obj->has_global_gtt_mapping = 1; 370 371 list_add_tail(&obj->global_list, &dev_priv->mm.bound_list); 372 list_add_tail(&obj->mm_list, &dev_priv->mm.inactive_list); 373 374 return obj; 375 #else 376 return NULL; 377 #endif 378 } 379