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 u32 base; 48 49 /* Almost universally we can find the Graphics Base of Stolen Memory 50 * at offset 0x5c in the igfx configuration space. On a few (desktop) 51 * machines this is also mirrored in the bridge device at different 52 * locations, or in the MCHBAR. On gen2, the layout is again slightly 53 * different with the Graphics Segment immediately following Top of 54 * Memory (or Top of Usable DRAM). Note it appears that TOUD is only 55 * reported by 865g, so we just use the top of memory as determined 56 * by the e820 probe. 57 * 58 * XXX However gen2 requires an unavailable symbol. 59 */ 60 base = 0; 61 if (INTEL_INFO(dev)->gen >= 3) { 62 /* Read Graphics Base of Stolen Memory directly */ 63 pci_read_config_dword(dev->pdev, 0x5c, &base); 64 base &= ~((1<<20) - 1); 65 } else { /* GEN2 */ 66 #if 0 67 /* Stolen is immediately above Top of Memory */ 68 base = max_low_pfn_mapped << PAGE_SHIFT; 69 #endif 70 } 71 72 if (base == 0) 73 return 0; 74 75 /* Verify that nothing else uses this physical address. Stolen 76 * memory should be reserved by the BIOS and hidden from the 77 * kernel. So if the region is already marked as busy, something 78 * is seriously wrong. 79 */ 80 #if 0 81 r = devm_request_mem_region(dev->dev, base, dev_priv->gtt.stolen_size, 82 "Graphics Stolen Memory"); 83 if (r == NULL) { 84 /* 85 * One more attempt but this time requesting region from 86 * base + 1, as we have seen that this resolves the region 87 * conflict with the PCI Bus. 88 * This is a BIOS w/a: Some BIOS wrap stolen in the root 89 * PCI bus, but have an off-by-one error. Hence retry the 90 * reservation starting from 1 instead of 0. 91 */ 92 r = devm_request_mem_region(dev->dev, base + 1, 93 dev_priv->gtt.stolen_size - 1, 94 "Graphics Stolen Memory"); 95 if (r == NULL) { 96 DRM_ERROR("conflict detected with stolen region: [0x%08x - 0x%08x]\n", 97 base, base + (uint32_t)dev_priv->gtt.stolen_size); 98 base = 0; 99 } 100 } 101 #endif 102 103 return base; 104 } 105 106 static int i915_setup_compression(struct drm_device *dev, int size) 107 { 108 struct drm_i915_private *dev_priv = dev->dev_private; 109 struct drm_mm_node *compressed_fb, *compressed_llb = NULL; 110 int ret; 111 112 compressed_fb = kzalloc(sizeof(*compressed_fb), GFP_KERNEL); 113 if (!compressed_fb) 114 goto err_llb; 115 116 /* Try to over-allocate to reduce reallocations and fragmentation */ 117 ret = drm_mm_insert_node(&dev_priv->mm.stolen, compressed_fb, 118 size <<= 1, 4096, DRM_MM_SEARCH_DEFAULT); 119 if (ret) 120 ret = drm_mm_insert_node(&dev_priv->mm.stolen, compressed_fb, 121 size >>= 1, 4096, 122 DRM_MM_SEARCH_DEFAULT); 123 if (ret) 124 goto err_llb; 125 126 if (HAS_PCH_SPLIT(dev)) 127 I915_WRITE(ILK_DPFC_CB_BASE, compressed_fb->start); 128 else if (IS_GM45(dev)) { 129 I915_WRITE(DPFC_CB_BASE, compressed_fb->start); 130 } else { 131 compressed_llb = kzalloc(sizeof(*compressed_llb), GFP_KERNEL); 132 if (!compressed_llb) 133 goto err_fb; 134 135 ret = drm_mm_insert_node(&dev_priv->mm.stolen, compressed_llb, 136 4096, 4096, DRM_MM_SEARCH_DEFAULT); 137 if (ret) 138 goto err_fb; 139 140 dev_priv->fbc.compressed_llb = compressed_llb; 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); 146 } 147 148 dev_priv->fbc.compressed_fb = compressed_fb; 149 dev_priv->fbc.size = size; 150 151 DRM_DEBUG_KMS("reserved %d bytes of contiguous stolen space for FBC\n", 152 size); 153 154 return 0; 155 156 err_fb: 157 kfree(compressed_llb); 158 drm_mm_remove_node(compressed_fb); 159 err_llb: 160 kfree(compressed_fb); 161 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); 162 return -ENOSPC; 163 } 164 165 int i915_gem_stolen_setup_compression(struct drm_device *dev, int size) 166 { 167 struct drm_i915_private *dev_priv = dev->dev_private; 168 169 if (!drm_mm_initialized(&dev_priv->mm.stolen)) 170 return -ENODEV; 171 172 if (size < dev_priv->fbc.size) 173 return 0; 174 175 /* Release any current block */ 176 i915_gem_stolen_cleanup_compression(dev); 177 178 return i915_setup_compression(dev, size); 179 } 180 181 void i915_gem_stolen_cleanup_compression(struct drm_device *dev) 182 { 183 struct drm_i915_private *dev_priv = dev->dev_private; 184 185 if (dev_priv->fbc.size == 0) 186 return; 187 188 if (dev_priv->fbc.compressed_fb) { 189 drm_mm_remove_node(dev_priv->fbc.compressed_fb); 190 kfree(dev_priv->fbc.compressed_fb); 191 } 192 193 if (dev_priv->fbc.compressed_llb) { 194 drm_mm_remove_node(dev_priv->fbc.compressed_llb); 195 kfree(dev_priv->fbc.compressed_llb); 196 } 197 198 dev_priv->fbc.size = 0; 199 } 200 201 void i915_gem_cleanup_stolen(struct drm_device *dev) 202 { 203 struct drm_i915_private *dev_priv = dev->dev_private; 204 205 if (!drm_mm_initialized(&dev_priv->mm.stolen)) 206 return; 207 208 i915_gem_stolen_cleanup_compression(dev); 209 drm_mm_takedown(&dev_priv->mm.stolen); 210 } 211 212 int i915_gem_init_stolen(struct drm_device *dev) 213 { 214 struct drm_i915_private *dev_priv = dev->dev_private; 215 int bios_reserved = 0; 216 217 #ifdef CONFIG_INTEL_IOMMU 218 if (intel_iommu_gfx_mapped) { 219 DRM_INFO("DMAR active, disabling use of stolen memory\n"); 220 return 0; 221 } 222 #endif 223 224 if (dev_priv->gtt.stolen_size == 0) 225 return 0; 226 227 dev_priv->mm.stolen_base = i915_stolen_to_physical(dev); 228 if (dev_priv->mm.stolen_base == 0) 229 return 0; 230 231 DRM_DEBUG_KMS("found %zd bytes of stolen memory at %08lx\n", 232 dev_priv->gtt.stolen_size, dev_priv->mm.stolen_base); 233 234 if (IS_VALLEYVIEW(dev)) 235 bios_reserved = 1024*1024; /* top 1M on VLV/BYT */ 236 237 if (WARN_ON(bios_reserved > dev_priv->gtt.stolen_size)) 238 return 0; 239 240 /* Basic memrange allocator for stolen space */ 241 drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->gtt.stolen_size - 242 bios_reserved); 243 244 return 0; 245 } 246 247 #if 0 248 static struct sg_table * 249 i915_pages_create_for_stolen(struct drm_device *dev, 250 u32 offset, u32 size) 251 { 252 struct drm_i915_private *dev_priv = dev->dev_private; 253 struct sg_table *st; 254 struct scatterlist *sg; 255 256 DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size); 257 BUG_ON(offset > dev_priv->gtt.stolen_size - size); 258 259 /* We hide that we have no struct page backing our stolen object 260 * by wrapping the contiguous physical allocation with a fake 261 * dma mapping in a single scatterlist. 262 */ 263 264 st = kmalloc(sizeof(*st), GFP_KERNEL); 265 if (st == NULL) 266 return NULL; 267 268 if (sg_alloc_table(st, 1, GFP_KERNEL)) { 269 kfree(st); 270 return NULL; 271 } 272 273 sg = st->sgl; 274 sg->offset = 0; 275 sg->length = size; 276 277 sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset; 278 sg_dma_len(sg) = size; 279 280 return st; 281 } 282 #endif 283 284 static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj) 285 { 286 BUG(); 287 return -EINVAL; 288 } 289 290 static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj) 291 { 292 #if 0 293 /* Should only be called during free */ 294 sg_free_table(obj->pages); 295 kfree(obj->pages); 296 #else 297 BUG(); 298 #endif 299 } 300 301 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = { 302 .get_pages = i915_gem_object_get_pages_stolen, 303 .put_pages = i915_gem_object_put_pages_stolen, 304 }; 305 306 static struct drm_i915_gem_object * 307 _i915_gem_object_create_stolen(struct drm_device *dev, 308 struct drm_mm_node *stolen) 309 { 310 struct drm_i915_gem_object *obj; 311 312 #if 0 313 obj = i915_gem_object_alloc(dev); 314 #else 315 obj = NULL; 316 #endif 317 if (obj == NULL) 318 return NULL; 319 320 drm_gem_private_object_init(dev, &obj->base, stolen->size); 321 i915_gem_object_init(obj, &i915_gem_object_stolen_ops); 322 323 #if 0 324 obj->pages = i915_pages_create_for_stolen(dev, 325 stolen->start, stolen->size); 326 #else 327 obj->pages = NULL; 328 #endif 329 if (obj->pages == NULL) 330 goto cleanup; 331 332 obj->has_dma_mapping = true; 333 i915_gem_object_pin_pages(obj); 334 obj->stolen = stolen; 335 336 obj->base.read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT; 337 obj->cache_level = HAS_LLC(dev) ? I915_CACHE_LLC : I915_CACHE_NONE; 338 339 return obj; 340 341 cleanup: 342 i915_gem_object_free(obj); 343 return NULL; 344 } 345 346 struct drm_i915_gem_object * 347 i915_gem_object_create_stolen(struct drm_device *dev, u32 size) 348 { 349 struct drm_i915_private *dev_priv = dev->dev_private; 350 struct drm_i915_gem_object *obj; 351 struct drm_mm_node *stolen; 352 int ret; 353 354 if (!drm_mm_initialized(&dev_priv->mm.stolen)) 355 return NULL; 356 357 DRM_DEBUG_KMS("creating stolen object: size=%x\n", size); 358 if (size == 0) 359 return NULL; 360 361 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL); 362 if (!stolen) 363 return NULL; 364 365 ret = drm_mm_insert_node(&dev_priv->mm.stolen, stolen, size, 366 4096, DRM_MM_SEARCH_DEFAULT); 367 if (ret) { 368 kfree(stolen); 369 return NULL; 370 } 371 372 obj = _i915_gem_object_create_stolen(dev, stolen); 373 if (obj) 374 return obj; 375 376 drm_mm_remove_node(stolen); 377 kfree(stolen); 378 return NULL; 379 } 380 381 struct drm_i915_gem_object * 382 i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev, 383 u32 stolen_offset, 384 u32 gtt_offset, 385 u32 size) 386 { 387 struct drm_i915_private *dev_priv = dev->dev_private; 388 struct i915_address_space *ggtt = &dev_priv->gtt.base; 389 struct drm_i915_gem_object *obj; 390 struct drm_mm_node *stolen; 391 struct i915_vma *vma; 392 int ret; 393 394 if (!drm_mm_initialized(&dev_priv->mm.stolen)) 395 return NULL; 396 397 DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n", 398 stolen_offset, gtt_offset, size); 399 400 /* KISS and expect everything to be page-aligned */ 401 BUG_ON(stolen_offset & 4095); 402 BUG_ON(size & 4095); 403 404 if (WARN_ON(size == 0)) 405 return NULL; 406 407 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL); 408 if (!stolen) 409 return NULL; 410 411 stolen->start = stolen_offset; 412 stolen->size = size; 413 ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen); 414 if (ret) { 415 DRM_DEBUG_KMS("failed to allocate stolen space\n"); 416 kfree(stolen); 417 return NULL; 418 } 419 420 obj = _i915_gem_object_create_stolen(dev, stolen); 421 if (obj == NULL) { 422 DRM_DEBUG_KMS("failed to allocate stolen object\n"); 423 drm_mm_remove_node(stolen); 424 kfree(stolen); 425 return NULL; 426 } 427 428 /* Some objects just need physical mem from stolen space */ 429 if (gtt_offset == I915_GTT_OFFSET_NONE) 430 return obj; 431 432 vma = i915_gem_obj_lookup_or_create_vma(obj, ggtt); 433 if (IS_ERR(vma)) { 434 ret = PTR_ERR(vma); 435 goto err_out; 436 } 437 438 /* To simplify the initialisation sequence between KMS and GTT, 439 * we allow construction of the stolen object prior to 440 * setting up the GTT space. The actual reservation will occur 441 * later. 442 */ 443 vma->node.start = gtt_offset; 444 vma->node.size = size; 445 if (drm_mm_initialized(&ggtt->mm)) { 446 ret = drm_mm_reserve_node(&ggtt->mm, &vma->node); 447 if (ret) { 448 DRM_DEBUG_KMS("failed to allocate stolen GTT space\n"); 449 goto err_vma; 450 } 451 } 452 453 obj->has_global_gtt_mapping = 1; 454 455 list_add_tail(&obj->global_list, &dev_priv->mm.bound_list); 456 list_add_tail(&vma->mm_list, &ggtt->inactive_list); 457 i915_gem_object_pin_pages(obj); 458 459 return obj; 460 461 err_vma: 462 i915_gem_vma_destroy(vma); 463 err_out: 464 drm_mm_remove_node(stolen); 465 kfree(stolen); 466 drm_gem_object_unreference(&obj->base); 467 return NULL; 468 } 469 470 void 471 i915_gem_object_release_stolen(struct drm_i915_gem_object *obj) 472 { 473 if (obj->stolen) { 474 drm_mm_remove_node(obj->stolen); 475 kfree(obj->stolen); 476 obj->stolen = NULL; 477 } 478 } 479