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 45static unsigned long i915_stolen_to_physical(struct drm_device *dev) 46{ 47 struct drm_i915_private *dev_priv = dev->dev_private; 48 struct resource *r; 49 u32 base; 50 51 /* Almost universally we can find the Graphics Base of Stolen Memory 52 * at offset 0x5c in the igfx configuration space. On a few (desktop) 53 * machines this is also mirrored in the bridge device at different 54 * locations, or in the MCHBAR. On gen2, the layout is again slightly 55 * different with the Graphics Segment immediately following Top of 56 * Memory (or Top of Usable DRAM). Note it appears that TOUD is only 57 * reported by 865g, so we just use the top of memory as determined 58 * by the e820 probe. 59 * 60 * XXX However gen2 requires an unavailable symbol. 61 */ 62 base = 0; 63 if (INTEL_INFO(dev)->gen >= 3) { 64 /* Read Graphics Base of Stolen Memory directly */ 65 pci_read_config_dword(dev->pdev, 0x5c, &base); 66 base &= ~((1<<20) - 1); 67 } else { /* GEN2 */ 68#if 0 69 /* Stolen is immediately above Top of Memory */ 70 base = max_low_pfn_mapped << PAGE_SHIFT; 71#endif 72 } 73 74 if (base == 0) 75 return 0; 76 77 /* make sure we don't clobber the GTT if it's within stolen memory */ 78 if (INTEL_INFO(dev)->gen <= 4 && !IS_G33(dev) && !IS_G4X(dev)) { 79 struct { 80 u32 start, end; 81 } stolen[2] = { 82 { .start = base, .end = base + dev_priv->gtt.stolen_size, }, 83 { .start = base, .end = base + dev_priv->gtt.stolen_size, }, 84 }; 85 u64 gtt_start, gtt_end; 86 87 gtt_start = I915_READ(PGTBL_CTL); 88 if (IS_GEN4(dev)) 89 gtt_start = (gtt_start & PGTBL_ADDRESS_LO_MASK) | 90 (gtt_start & PGTBL_ADDRESS_HI_MASK) << 28; 91 else 92 gtt_start &= PGTBL_ADDRESS_LO_MASK; 93 gtt_end = gtt_start + gtt_total_entries(dev_priv->gtt) * 4; 94 95 if (gtt_start >= stolen[0].start && gtt_start < stolen[0].end) 96 stolen[0].end = gtt_start; 97 if (gtt_end > stolen[1].start && gtt_end <= stolen[1].end) 98 stolen[1].start = gtt_end; 99 100 /* pick the larger of the two chunks */ 101 if (stolen[0].end - stolen[0].start > 102 stolen[1].end - stolen[1].start) { 103 base = stolen[0].start; 104 dev_priv->gtt.stolen_size = stolen[0].end - stolen[0].start; 105 } else { 106 base = stolen[1].start; 107 dev_priv->gtt.stolen_size = stolen[1].end - stolen[1].start; 108 } 109 110 if (stolen[0].start != stolen[1].start || 111 stolen[0].end != stolen[1].end) { 112 DRM_DEBUG_KMS("GTT within stolen memory at 0x%llx-0x%llx\n", 113 (unsigned long long) gtt_start, 114 (unsigned long long) gtt_end - 1); 115 DRM_DEBUG_KMS("Stolen memory adjusted to 0x%x-0x%x\n", 116 base, base + (u32) dev_priv->gtt.stolen_size - 1); 117 } 118 } 119 120 121 /* Verify that nothing else uses this physical address. Stolen 122 * memory should be reserved by the BIOS and hidden from the 123 * kernel. So if the region is already marked as busy, something 124 * is seriously wrong. 125 */ 126 r = devm_request_mem_region(dev->dev, base, dev_priv->gtt.stolen_size, 127 "Graphics Stolen Memory"); 128 if (r == NULL) { 129 /* 130 * One more attempt but this time requesting region from 131 * base + 1, as we have seen that this resolves the region 132 * conflict with the PCI Bus. 133 * This is a BIOS w/a: Some BIOS wrap stolen in the root 134 * PCI bus, but have an off-by-one error. Hence retry the 135 * reservation starting from 1 instead of 0. 136 */ 137 r = devm_request_mem_region(dev->dev, base + 1, 138 dev_priv->gtt.stolen_size - 1, 139 "Graphics Stolen Memory"); 140 if (r == NULL) { 141 DRM_ERROR("conflict detected with stolen region: [0x%08x - 0x%08x]\n", 142 base, base + (uint32_t)dev_priv->gtt.stolen_size); 143 base = 0; 144 } 145 } 146 147 return base; 148} 149 150static int find_compression_threshold(struct drm_device *dev, 151 struct drm_mm_node *node, 152 int size, 153 int fb_cpp) 154{ 155 struct drm_i915_private *dev_priv = dev->dev_private; 156 int compression_threshold = 1; 157 int ret; 158 159 /* HACK: This code depends on what we will do in *_enable_fbc. If that 160 * code changes, this code needs to change as well. 161 * 162 * The enable_fbc code will attempt to use one of our 2 compression 163 * thresholds, therefore, in that case, we only have 1 resort. 164 */ 165 166 /* Try to over-allocate to reduce reallocations and fragmentation. */ 167 ret = drm_mm_insert_node(&dev_priv->mm.stolen, node, 168 size <<= 1, 4096, DRM_MM_SEARCH_DEFAULT); 169 if (ret == 0) 170 return compression_threshold; 171 172again: 173 /* HW's ability to limit the CFB is 1:4 */ 174 if (compression_threshold > 4 || 175 (fb_cpp == 2 && compression_threshold == 2)) 176 return 0; 177 178 ret = drm_mm_insert_node(&dev_priv->mm.stolen, node, 179 size >>= 1, 4096, 180 DRM_MM_SEARCH_DEFAULT); 181 if (ret && INTEL_INFO(dev)->gen <= 4) { 182 return 0; 183 } else if (ret) { 184 compression_threshold <<= 1; 185 goto again; 186 } else { 187 return compression_threshold; 188 } 189} 190 191static int i915_setup_compression(struct drm_device *dev, int size, int fb_cpp) 192{ 193 struct drm_i915_private *dev_priv = dev->dev_private; 194 struct drm_mm_node *uninitialized_var(compressed_llb); 195 int ret; 196 197 ret = find_compression_threshold(dev, &dev_priv->fbc.compressed_fb, 198 size, fb_cpp); 199 if (!ret) 200 goto err_llb; 201 else if (ret > 1) { 202 DRM_INFO("Reducing the compressed framebuffer size. This may lead to less power savings than a non-reduced-size. Try to increase stolen memory size if available in BIOS.\n"); 203 204 } 205 206 dev_priv->fbc.threshold = ret; 207 208 if (HAS_PCH_SPLIT(dev)) 209 I915_WRITE(ILK_DPFC_CB_BASE, dev_priv->fbc.compressed_fb.start); 210 else if (IS_GM45(dev)) { 211 I915_WRITE(DPFC_CB_BASE, dev_priv->fbc.compressed_fb.start); 212 } else { 213 compressed_llb = kzalloc(sizeof(*compressed_llb), GFP_KERNEL); 214 if (!compressed_llb) 215 goto err_fb; 216 217 ret = drm_mm_insert_node(&dev_priv->mm.stolen, compressed_llb, 218 4096, 4096, DRM_MM_SEARCH_DEFAULT); 219 if (ret) 220 goto err_fb; 221 222 dev_priv->fbc.compressed_llb = compressed_llb; 223 224 I915_WRITE(FBC_CFB_BASE, 225 dev_priv->mm.stolen_base + dev_priv->fbc.compressed_fb.start); 226 I915_WRITE(FBC_LL_BASE, 227 dev_priv->mm.stolen_base + compressed_llb->start); 228 } 229 230 dev_priv->fbc.size = size / dev_priv->fbc.threshold; 231 232 DRM_DEBUG_KMS("reserved %d bytes of contiguous stolen space for FBC\n", 233 size); 234 235 return 0; 236 237err_fb: 238 kfree(compressed_llb); 239 drm_mm_remove_node(&dev_priv->fbc.compressed_fb); 240err_llb: 241 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); 242 return -ENOSPC; 243} 244 245int i915_gem_stolen_setup_compression(struct drm_device *dev, int size, int fb_cpp) 246{ 247 struct drm_i915_private *dev_priv = dev->dev_private; 248 249 if (!drm_mm_initialized(&dev_priv->mm.stolen)) 250 return -ENODEV; 251 252 if (size < dev_priv->fbc.size) 253 return 0; 254 255 /* Release any current block */ 256 i915_gem_stolen_cleanup_compression(dev); 257 258 return i915_setup_compression(dev, size, fb_cpp); 259} 260 261void i915_gem_stolen_cleanup_compression(struct drm_device *dev) 262{ 263 struct drm_i915_private *dev_priv = dev->dev_private; 264 265 if (dev_priv->fbc.size == 0) 266 return; 267 268 drm_mm_remove_node(&dev_priv->fbc.compressed_fb); 269 270 if (dev_priv->fbc.compressed_llb) { 271 drm_mm_remove_node(dev_priv->fbc.compressed_llb); 272 kfree(dev_priv->fbc.compressed_llb); 273 } 274 275 dev_priv->fbc.size = 0; 276} 277 278void i915_gem_cleanup_stolen(struct drm_device *dev) 279{ 280 struct drm_i915_private *dev_priv = dev->dev_private; 281 282 if (!drm_mm_initialized(&dev_priv->mm.stolen)) 283 return; 284 285 i915_gem_stolen_cleanup_compression(dev); 286 drm_mm_takedown(&dev_priv->mm.stolen); 287} 288 289int i915_gem_init_stolen(struct drm_device *dev) 290{ 291 struct drm_i915_private *dev_priv = dev->dev_private; 292 u32 tmp; 293 int bios_reserved = 0; 294 295#ifdef CONFIG_INTEL_IOMMU 296 if (intel_iommu_gfx_mapped && INTEL_INFO(dev)->gen < 8) { 297 DRM_INFO("DMAR active, disabling use of stolen memory\n"); 298 return 0; 299 } 300#endif 301 302 if (dev_priv->gtt.stolen_size == 0) 303 return 0; 304 305 dev_priv->mm.stolen_base = i915_stolen_to_physical(dev); 306 if (dev_priv->mm.stolen_base == 0) 307 return 0; 308 309 DRM_DEBUG_KMS("found %zd bytes of stolen memory at %08lx\n", 310 dev_priv->gtt.stolen_size, dev_priv->mm.stolen_base); 311 312 if (INTEL_INFO(dev)->gen >= 8) { 313 tmp = I915_READ(GEN7_BIOS_RESERVED); 314 tmp >>= GEN8_BIOS_RESERVED_SHIFT; 315 tmp &= GEN8_BIOS_RESERVED_MASK; 316 bios_reserved = (1024*1024) << tmp; 317 } else if (IS_GEN7(dev)) { 318 tmp = I915_READ(GEN7_BIOS_RESERVED); 319 bios_reserved = tmp & GEN7_BIOS_RESERVED_256K ? 320 256*1024 : 1024*1024; 321 } 322 323 if (WARN_ON(bios_reserved > dev_priv->gtt.stolen_size)) 324 return 0; 325 326 /* Basic memrange allocator for stolen space */ 327 drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->gtt.stolen_size - 328 bios_reserved); 329 330 return 0; 331} 332 333static struct sg_table * 334i915_pages_create_for_stolen(struct drm_device *dev, 335 u32 offset, u32 size) 336{ 337 struct drm_i915_private *dev_priv = dev->dev_private; 338 struct sg_table *st; 339 struct scatterlist *sg; 340 341 DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size); 342 BUG_ON(offset > dev_priv->gtt.stolen_size - size); 343 344 /* We hide that we have no struct page backing our stolen object 345 * by wrapping the contiguous physical allocation with a fake 346 * dma mapping in a single scatterlist. 347 */ 348 349 st = kmalloc(sizeof(*st), GFP_KERNEL); 350 if (st == NULL) 351 return NULL; 352 353 if (sg_alloc_table(st, 1, GFP_KERNEL)) { 354 kfree(st); 355 return NULL; 356 } 357 358 sg = st->sgl; 359 sg->offset = 0; 360 sg->length = size; 361 362 sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset; 363 sg_dma_len(sg) = size; 364 365 return st; 366} 367 368static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj) 369{ 370 BUG(); 371 return -EINVAL; 372} 373 374static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj) 375{ 376 /* Should only be called during free */ 377 sg_free_table(obj->pages); 378 kfree(obj->pages); 379} 380 381 382static void 383i915_gem_object_release_stolen(struct drm_i915_gem_object *obj) 384{ 385 if (obj->stolen) { 386 drm_mm_remove_node(obj->stolen); 387 kfree(obj->stolen); 388 obj->stolen = NULL; 389 } 390} 391static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = { 392 .get_pages = i915_gem_object_get_pages_stolen, 393 .put_pages = i915_gem_object_put_pages_stolen, 394 .release = i915_gem_object_release_stolen, 395}; 396 397static struct drm_i915_gem_object * 398_i915_gem_object_create_stolen(struct drm_device *dev, 399 struct drm_mm_node *stolen) 400{ 401 struct drm_i915_gem_object *obj; 402 403 obj = i915_gem_object_alloc(dev); 404 if (obj == NULL) 405 return NULL; 406 407 drm_gem_private_object_init(dev, &obj->base, stolen->size); 408 i915_gem_object_init(obj, &i915_gem_object_stolen_ops); 409 410 obj->pages = i915_pages_create_for_stolen(dev, 411 stolen->start, stolen->size); 412 if (obj->pages == NULL) 413 goto cleanup; 414 415 obj->has_dma_mapping = true; 416 i915_gem_object_pin_pages(obj); 417 obj->stolen = stolen; 418 419 obj->base.read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT; 420 obj->cache_level = HAS_LLC(dev) ? I915_CACHE_LLC : I915_CACHE_NONE; 421 422 return obj; 423 424cleanup: 425 i915_gem_object_free(obj); 426 return NULL; 427} 428 429struct drm_i915_gem_object * 430i915_gem_object_create_stolen(struct drm_device *dev, u32 size) 431{ 432 struct drm_i915_private *dev_priv = dev->dev_private; 433 struct drm_i915_gem_object *obj; 434 struct drm_mm_node *stolen; 435 int ret; 436 437 if (!drm_mm_initialized(&dev_priv->mm.stolen)) 438 return NULL; 439 440 DRM_DEBUG_KMS("creating stolen object: size=%x\n", size); 441 if (size == 0) 442 return NULL; 443 444 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL); 445 if (!stolen) 446 return NULL; 447 448 ret = drm_mm_insert_node(&dev_priv->mm.stolen, stolen, size, 449 4096, DRM_MM_SEARCH_DEFAULT); 450 if (ret) { 451 kfree(stolen); 452 return NULL; 453 } 454 455 obj = _i915_gem_object_create_stolen(dev, stolen); 456 if (obj) 457 return obj; 458 459 drm_mm_remove_node(stolen); 460 kfree(stolen); 461 return NULL; 462} 463 464struct drm_i915_gem_object * 465i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev, 466 u32 stolen_offset, 467 u32 gtt_offset, 468 u32 size) 469{ 470 struct drm_i915_private *dev_priv = dev->dev_private; 471 struct i915_address_space *ggtt = &dev_priv->gtt.base; 472 struct drm_i915_gem_object *obj; 473 struct drm_mm_node *stolen; 474 struct i915_vma *vma; 475 int ret; 476 477 if (!drm_mm_initialized(&dev_priv->mm.stolen)) 478 return NULL; 479 480 DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n", 481 stolen_offset, gtt_offset, size); 482 483 /* KISS and expect everything to be page-aligned */ 484 BUG_ON(stolen_offset & 4095); 485 BUG_ON(size & 4095); 486 487 if (WARN_ON(size == 0)) 488 return NULL; 489 490 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL); 491 if (!stolen) 492 return NULL; 493 494 stolen->start = stolen_offset; 495 stolen->size = size; 496 ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen); 497 if (ret) { 498 DRM_DEBUG_KMS("failed to allocate stolen space\n"); 499 kfree(stolen); 500 return NULL; 501 } 502 503 obj = _i915_gem_object_create_stolen(dev, stolen); 504 if (obj == NULL) { 505 DRM_DEBUG_KMS("failed to allocate stolen object\n"); 506 drm_mm_remove_node(stolen); 507 kfree(stolen); 508 return NULL; 509 } 510 511 /* Some objects just need physical mem from stolen space */ 512 if (gtt_offset == I915_GTT_OFFSET_NONE) 513 return obj; 514 515 vma = i915_gem_obj_lookup_or_create_vma(obj, ggtt); 516 if (IS_ERR(vma)) { 517 ret = PTR_ERR(vma); 518 goto err_out; 519 } 520 521 /* To simplify the initialisation sequence between KMS and GTT, 522 * we allow construction of the stolen object prior to 523 * setting up the GTT space. The actual reservation will occur 524 * later. 525 */ 526 vma->node.start = gtt_offset; 527 vma->node.size = size; 528 if (drm_mm_initialized(&ggtt->mm)) { 529 ret = drm_mm_reserve_node(&ggtt->mm, &vma->node); 530 if (ret) { 531 DRM_DEBUG_KMS("failed to allocate stolen GTT space\n"); 532 goto err_vma; 533 } 534 } 535 536 obj->has_global_gtt_mapping = 1; 537 538 list_add_tail(&obj->global_list, &dev_priv->mm.bound_list); 539 list_add_tail(&vma->mm_list, &ggtt->inactive_list); 540 i915_gem_object_pin_pages(obj); 541 542 return obj; 543 544err_vma: 545 i915_gem_vma_destroy(vma); 546err_out: 547 drm_mm_remove_node(stolen); 548 kfree(stolen); 549 drm_gem_object_unreference(&obj->base); 550 return NULL; 551} 552