| 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 | #define KB(x) ((x) * 1024) |
| 34 | #define MB(x) (KB(x) * 1024) |
| 35 | |
| 36 | /* |
| 37 | * The BIOS typically reserves some of the system's memory for the exclusive |
| 38 | * use of the integrated graphics. This memory is no longer available for |
| 39 | * use by the OS and so the user finds that his system has less memory |
| 40 | * available than he put in. We refer to this memory as stolen. |
| 41 | * |
| 42 | * The BIOS will allocate its framebuffer from the stolen memory. Our |
| 43 | * goal is try to reuse that object for our own fbcon which must always |
| 44 | * be available for panics. Anything else we can reuse the stolen memory |
| 45 | * for is a boon. |
| 46 | */ |
| 47 | |
| 48 | int i915_gem_stolen_insert_node_in_range(struct drm_i915_private *dev_priv, |
| 49 | struct drm_mm_node *node, u64 size, |
| 50 | unsigned alignment, u64 start, u64 end) |
| 51 | { |
| 52 | int ret; |
| 53 | |
| 54 | if (!drm_mm_initialized(&dev_priv->mm.stolen)) |
| 55 | return -ENODEV; |
| 56 | |
| 57 | /* See the comment at the drm_mm_init() call for more about this check. |
| 58 | * WaSkipStolenMemoryFirstPage:bdw,chv (incomplete) */ |
| 59 | if (IS_GEN8(dev_priv) && start < 4096) |
| 60 | start = 4096; |
| 61 | |
| 62 | mutex_lock(&dev_priv->mm.stolen_lock); |
| 63 | ret = drm_mm_insert_node_in_range(&dev_priv->mm.stolen, node, size, |
| 64 | alignment, start, end, |
| 65 | DRM_MM_SEARCH_DEFAULT); |
| 66 | mutex_unlock(&dev_priv->mm.stolen_lock); |
| 67 | |
| 68 | return ret; |
| 69 | } |
| 70 | |
| 71 | int i915_gem_stolen_insert_node(struct drm_i915_private *dev_priv, |
| 72 | struct drm_mm_node *node, u64 size, |
| 73 | unsigned alignment) |
| 74 | { |
| 75 | struct i915_ggtt *ggtt = &dev_priv->ggtt; |
| 76 | |
| 77 | return i915_gem_stolen_insert_node_in_range(dev_priv, node, size, |
| 78 | alignment, 0, |
| 79 | ggtt->stolen_usable_size); |
| 80 | } |
| 81 | |
| 82 | void i915_gem_stolen_remove_node(struct drm_i915_private *dev_priv, |
| 83 | struct drm_mm_node *node) |
| 84 | { |
| 85 | mutex_lock(&dev_priv->mm.stolen_lock); |
| 86 | drm_mm_remove_node(node); |
| 87 | mutex_unlock(&dev_priv->mm.stolen_lock); |
| 88 | } |
| 89 | |
| 90 | static unsigned long i915_stolen_to_physical(struct drm_device *dev) |
| 91 | { |
| 92 | struct drm_i915_private *dev_priv = to_i915(dev); |
| 93 | struct i915_ggtt *ggtt = &dev_priv->ggtt; |
| 94 | struct resource *r; |
| 95 | u32 base; |
| 96 | |
| 97 | /* Almost universally we can find the Graphics Base of Stolen Memory |
| 98 | * at register BSM (0x5c) in the igfx configuration space. On a few |
| 99 | * (desktop) machines this is also mirrored in the bridge device at |
| 100 | * different locations, or in the MCHBAR. |
| 101 | * |
| 102 | * On 865 we just check the TOUD register. |
| 103 | * |
| 104 | * On 830/845/85x the stolen memory base isn't available in any |
| 105 | * register. We need to calculate it as TOM-TSEG_SIZE-stolen_size. |
| 106 | * |
| 107 | */ |
| 108 | base = 0; |
| 109 | if (INTEL_INFO(dev)->gen >= 3) { |
| 110 | u32 bsm; |
| 111 | |
| 112 | pci_read_config_dword(dev->pdev, INTEL_BSM, &bsm); |
| 113 | |
| 114 | base = bsm & INTEL_BSM_MASK; |
| 115 | } else if (IS_I865G(dev)) { |
| 116 | u16 toud = 0; |
| 117 | |
| 118 | /* |
| 119 | * FIXME is the graphics stolen memory region |
| 120 | * always at TOUD? Ie. is it always the last |
| 121 | * one to be allocated by the BIOS? |
| 122 | */ |
| 123 | pci_bus_read_config_word(dev->pdev->bus, PCI_DEVFN(0, 0), |
| 124 | I865_TOUD, &toud); |
| 125 | |
| 126 | base = toud << 16; |
| 127 | } else if (IS_I85X(dev)) { |
| 128 | u32 tseg_size = 0; |
| 129 | u32 tom; |
| 130 | u8 tmp; |
| 131 | |
| 132 | pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0), |
| 133 | I85X_ESMRAMC, &tmp); |
| 134 | |
| 135 | if (tmp & TSEG_ENABLE) |
| 136 | tseg_size = MB(1); |
| 137 | |
| 138 | pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 1), |
| 139 | I85X_DRB3, &tmp); |
| 140 | tom = tmp * MB(32); |
| 141 | |
| 142 | base = tom - tseg_size - ggtt->stolen_size; |
| 143 | } else if (IS_845G(dev)) { |
| 144 | u32 tseg_size = 0; |
| 145 | u32 tom; |
| 146 | u8 tmp; |
| 147 | |
| 148 | pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0), |
| 149 | I845_ESMRAMC, &tmp); |
| 150 | |
| 151 | if (tmp & TSEG_ENABLE) { |
| 152 | switch (tmp & I845_TSEG_SIZE_MASK) { |
| 153 | case I845_TSEG_SIZE_512K: |
| 154 | tseg_size = KB(512); |
| 155 | break; |
| 156 | case I845_TSEG_SIZE_1M: |
| 157 | tseg_size = MB(1); |
| 158 | break; |
| 159 | } |
| 160 | } |
| 161 | |
| 162 | pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0), |
| 163 | I830_DRB3, &tmp); |
| 164 | tom = tmp * MB(32); |
| 165 | |
| 166 | base = tom - tseg_size - ggtt->stolen_size; |
| 167 | } else if (IS_I830(dev)) { |
| 168 | u32 tseg_size = 0; |
| 169 | u32 tom; |
| 170 | u8 tmp; |
| 171 | |
| 172 | pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0), |
| 173 | I830_ESMRAMC, &tmp); |
| 174 | |
| 175 | if (tmp & TSEG_ENABLE) { |
| 176 | if (tmp & I830_TSEG_SIZE_1M) |
| 177 | tseg_size = MB(1); |
| 178 | else |
| 179 | tseg_size = KB(512); |
| 180 | } |
| 181 | |
| 182 | pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0), |
| 183 | I830_DRB3, &tmp); |
| 184 | tom = tmp * MB(32); |
| 185 | |
| 186 | base = tom - tseg_size - ggtt->stolen_size; |
| 187 | } |
| 188 | |
| 189 | if (base == 0) |
| 190 | return 0; |
| 191 | |
| 192 | /* make sure we don't clobber the GTT if it's within stolen memory */ |
| 193 | if (INTEL_INFO(dev)->gen <= 4 && !IS_G33(dev) && !IS_G4X(dev)) { |
| 194 | struct { |
| 195 | u32 start, end; |
| 196 | } stolen[2] = { |
| 197 | { .start = base, .end = base + ggtt->stolen_size, }, |
| 198 | { .start = base, .end = base + ggtt->stolen_size, }, |
| 199 | }; |
| 200 | u64 ggtt_start, ggtt_end; |
| 201 | |
| 202 | ggtt_start = I915_READ(PGTBL_CTL); |
| 203 | if (IS_GEN4(dev)) |
| 204 | ggtt_start = (ggtt_start & PGTBL_ADDRESS_LO_MASK) | |
| 205 | (ggtt_start & PGTBL_ADDRESS_HI_MASK) << 28; |
| 206 | else |
| 207 | ggtt_start &= PGTBL_ADDRESS_LO_MASK; |
| 208 | ggtt_end = ggtt_start + ggtt_total_entries(ggtt) * 4; |
| 209 | |
| 210 | if (ggtt_start >= stolen[0].start && ggtt_start < stolen[0].end) |
| 211 | stolen[0].end = ggtt_start; |
| 212 | if (ggtt_end > stolen[1].start && ggtt_end <= stolen[1].end) |
| 213 | stolen[1].start = ggtt_end; |
| 214 | |
| 215 | /* pick the larger of the two chunks */ |
| 216 | if (stolen[0].end - stolen[0].start > |
| 217 | stolen[1].end - stolen[1].start) { |
| 218 | base = stolen[0].start; |
| 219 | ggtt->stolen_size = stolen[0].end - stolen[0].start; |
| 220 | } else { |
| 221 | base = stolen[1].start; |
| 222 | ggtt->stolen_size = stolen[1].end - stolen[1].start; |
| 223 | } |
| 224 | |
| 225 | if (stolen[0].start != stolen[1].start || |
| 226 | stolen[0].end != stolen[1].end) { |
| 227 | DRM_DEBUG_KMS("GTT within stolen memory at 0x%llx-0x%llx\n", |
| 228 | (unsigned long long)ggtt_start, |
| 229 | (unsigned long long)ggtt_end - 1); |
| 230 | DRM_DEBUG_KMS("Stolen memory adjusted to 0x%x-0x%x\n", |
| 231 | base, base + (u32)ggtt->stolen_size - 1); |
| 232 | } |
| 233 | } |
| 234 | |
| 235 | |
| 236 | /* Verify that nothing else uses this physical address. Stolen |
| 237 | * memory should be reserved by the BIOS and hidden from the |
| 238 | * kernel. So if the region is already marked as busy, something |
| 239 | * is seriously wrong. |
| 240 | */ |
| 241 | r = devm_request_mem_region(dev->dev, base, ggtt->stolen_size, |
| 242 | "Graphics Stolen Memory"); |
| 243 | if (r == NULL) { |
| 244 | /* |
| 245 | * One more attempt but this time requesting region from |
| 246 | * base + 1, as we have seen that this resolves the region |
| 247 | * conflict with the PCI Bus. |
| 248 | * This is a BIOS w/a: Some BIOS wrap stolen in the root |
| 249 | * PCI bus, but have an off-by-one error. Hence retry the |
| 250 | * reservation starting from 1 instead of 0. |
| 251 | */ |
| 252 | r = devm_request_mem_region(dev->dev, base + 1, |
| 253 | ggtt->stolen_size - 1, |
| 254 | "Graphics Stolen Memory"); |
| 255 | /* |
| 256 | * GEN3 firmware likes to smash pci bridges into the stolen |
| 257 | * range. Apparently this works. |
| 258 | */ |
| 259 | if (r == NULL && !IS_GEN3(dev)) { |
| 260 | DRM_ERROR("conflict detected with stolen region: [0x%08x - 0x%08x]\n", |
| 261 | base, base + (uint32_t)ggtt->stolen_size); |
| 262 | base = 0; |
| 263 | } |
| 264 | } |
| 265 | |
| 266 | return base; |
| 267 | } |
| 268 | |
| 269 | void i915_gem_cleanup_stolen(struct drm_device *dev) |
| 270 | { |
| 271 | struct drm_i915_private *dev_priv = dev->dev_private; |
| 272 | |
| 273 | if (!drm_mm_initialized(&dev_priv->mm.stolen)) |
| 274 | return; |
| 275 | |
| 276 | drm_mm_takedown(&dev_priv->mm.stolen); |
| 277 | } |
| 278 | |
| 279 | static void g4x_get_stolen_reserved(struct drm_i915_private *dev_priv, |
| 280 | unsigned long *base, unsigned long *size) |
| 281 | { |
| 282 | struct i915_ggtt *ggtt = &dev_priv->ggtt; |
| 283 | uint32_t reg_val = I915_READ(IS_GM45(dev_priv) ? |
| 284 | CTG_STOLEN_RESERVED : |
| 285 | ELK_STOLEN_RESERVED); |
| 286 | unsigned long stolen_top = dev_priv->mm.stolen_base + |
| 287 | ggtt->stolen_size; |
| 288 | |
| 289 | *base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16; |
| 290 | |
| 291 | WARN_ON((reg_val & G4X_STOLEN_RESERVED_ADDR1_MASK) < *base); |
| 292 | |
| 293 | /* On these platforms, the register doesn't have a size field, so the |
| 294 | * size is the distance between the base and the top of the stolen |
| 295 | * memory. We also have the genuine case where base is zero and there's |
| 296 | * nothing reserved. */ |
| 297 | if (*base == 0) |
| 298 | *size = 0; |
| 299 | else |
| 300 | *size = stolen_top - *base; |
| 301 | } |
| 302 | |
| 303 | static void gen6_get_stolen_reserved(struct drm_i915_private *dev_priv, |
| 304 | unsigned long *base, unsigned long *size) |
| 305 | { |
| 306 | uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED); |
| 307 | |
| 308 | *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK; |
| 309 | |
| 310 | switch (reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK) { |
| 311 | case GEN6_STOLEN_RESERVED_1M: |
| 312 | *size = 1024 * 1024; |
| 313 | break; |
| 314 | case GEN6_STOLEN_RESERVED_512K: |
| 315 | *size = 512 * 1024; |
| 316 | break; |
| 317 | case GEN6_STOLEN_RESERVED_256K: |
| 318 | *size = 256 * 1024; |
| 319 | break; |
| 320 | case GEN6_STOLEN_RESERVED_128K: |
| 321 | *size = 128 * 1024; |
| 322 | break; |
| 323 | default: |
| 324 | *size = 1024 * 1024; |
| 325 | MISSING_CASE(reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK); |
| 326 | } |
| 327 | } |
| 328 | |
| 329 | static void gen7_get_stolen_reserved(struct drm_i915_private *dev_priv, |
| 330 | unsigned long *base, unsigned long *size) |
| 331 | { |
| 332 | uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED); |
| 333 | |
| 334 | *base = reg_val & GEN7_STOLEN_RESERVED_ADDR_MASK; |
| 335 | |
| 336 | switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) { |
| 337 | case GEN7_STOLEN_RESERVED_1M: |
| 338 | *size = 1024 * 1024; |
| 339 | break; |
| 340 | case GEN7_STOLEN_RESERVED_256K: |
| 341 | *size = 256 * 1024; |
| 342 | break; |
| 343 | default: |
| 344 | *size = 1024 * 1024; |
| 345 | MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK); |
| 346 | } |
| 347 | } |
| 348 | |
| 349 | static void gen8_get_stolen_reserved(struct drm_i915_private *dev_priv, |
| 350 | unsigned long *base, unsigned long *size) |
| 351 | { |
| 352 | uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED); |
| 353 | |
| 354 | *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK; |
| 355 | |
| 356 | switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) { |
| 357 | case GEN8_STOLEN_RESERVED_1M: |
| 358 | *size = 1024 * 1024; |
| 359 | break; |
| 360 | case GEN8_STOLEN_RESERVED_2M: |
| 361 | *size = 2 * 1024 * 1024; |
| 362 | break; |
| 363 | case GEN8_STOLEN_RESERVED_4M: |
| 364 | *size = 4 * 1024 * 1024; |
| 365 | break; |
| 366 | case GEN8_STOLEN_RESERVED_8M: |
| 367 | *size = 8 * 1024 * 1024; |
| 368 | break; |
| 369 | default: |
| 370 | *size = 8 * 1024 * 1024; |
| 371 | MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK); |
| 372 | } |
| 373 | } |
| 374 | |
| 375 | static void bdw_get_stolen_reserved(struct drm_i915_private *dev_priv, |
| 376 | unsigned long *base, unsigned long *size) |
| 377 | { |
| 378 | struct i915_ggtt *ggtt = &dev_priv->ggtt; |
| 379 | uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED); |
| 380 | unsigned long stolen_top; |
| 381 | |
| 382 | stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size; |
| 383 | |
| 384 | *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK; |
| 385 | |
| 386 | /* On these platforms, the register doesn't have a size field, so the |
| 387 | * size is the distance between the base and the top of the stolen |
| 388 | * memory. We also have the genuine case where base is zero and there's |
| 389 | * nothing reserved. */ |
| 390 | if (*base == 0) |
| 391 | *size = 0; |
| 392 | else |
| 393 | *size = stolen_top - *base; |
| 394 | } |
| 395 | |
| 396 | int i915_gem_init_stolen(struct drm_device *dev) |
| 397 | { |
| 398 | struct drm_i915_private *dev_priv = to_i915(dev); |
| 399 | struct i915_ggtt *ggtt = &dev_priv->ggtt; |
| 400 | unsigned long reserved_total, reserved_base = 0, reserved_size; |
| 401 | unsigned long stolen_top; |
| 402 | |
| 403 | mutex_init(&dev_priv->mm.stolen_lock); |
| 404 | |
| 405 | #ifdef CONFIG_INTEL_IOMMU |
| 406 | if (intel_iommu_gfx_mapped && INTEL_INFO(dev)->gen < 8) { |
| 407 | DRM_INFO("DMAR active, disabling use of stolen memory\n"); |
| 408 | return 0; |
| 409 | } |
| 410 | #endif |
| 411 | |
| 412 | if (ggtt->stolen_size == 0) |
| 413 | return 0; |
| 414 | |
| 415 | dev_priv->mm.stolen_base = i915_stolen_to_physical(dev); |
| 416 | if (dev_priv->mm.stolen_base == 0) |
| 417 | return 0; |
| 418 | |
| 419 | stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size; |
| 420 | |
| 421 | switch (INTEL_INFO(dev_priv)->gen) { |
| 422 | case 2: |
| 423 | case 3: |
| 424 | break; |
| 425 | case 4: |
| 426 | if (IS_G4X(dev)) |
| 427 | g4x_get_stolen_reserved(dev_priv, &reserved_base, |
| 428 | &reserved_size); |
| 429 | break; |
| 430 | case 5: |
| 431 | /* Assume the gen6 maximum for the older platforms. */ |
| 432 | reserved_size = 1024 * 1024; |
| 433 | reserved_base = stolen_top - reserved_size; |
| 434 | break; |
| 435 | case 6: |
| 436 | gen6_get_stolen_reserved(dev_priv, &reserved_base, |
| 437 | &reserved_size); |
| 438 | break; |
| 439 | case 7: |
| 440 | gen7_get_stolen_reserved(dev_priv, &reserved_base, |
| 441 | &reserved_size); |
| 442 | break; |
| 443 | default: |
| 444 | if (IS_BROADWELL(dev_priv) || |
| 445 | IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev)) |
| 446 | bdw_get_stolen_reserved(dev_priv, &reserved_base, |
| 447 | &reserved_size); |
| 448 | else |
| 449 | gen8_get_stolen_reserved(dev_priv, &reserved_base, |
| 450 | &reserved_size); |
| 451 | break; |
| 452 | } |
| 453 | |
| 454 | /* It is possible for the reserved base to be zero, but the register |
| 455 | * field for size doesn't have a zero option. */ |
| 456 | if (reserved_base == 0) { |
| 457 | reserved_size = 0; |
| 458 | reserved_base = stolen_top; |
| 459 | } |
| 460 | |
| 461 | if (reserved_base < dev_priv->mm.stolen_base || |
| 462 | reserved_base + reserved_size > stolen_top) { |
| 463 | DRM_DEBUG_KMS("Stolen reserved area [0x%08lx - 0x%08lx] outside stolen memory [0x%08lx - 0x%08lx]\n", |
| 464 | reserved_base, reserved_base + reserved_size, |
| 465 | dev_priv->mm.stolen_base, stolen_top); |
| 466 | return 0; |
| 467 | } |
| 468 | |
| 469 | ggtt->stolen_reserved_base = reserved_base; |
| 470 | ggtt->stolen_reserved_size = reserved_size; |
| 471 | |
| 472 | /* It is possible for the reserved area to end before the end of stolen |
| 473 | * memory, so just consider the start. */ |
| 474 | reserved_total = stolen_top - reserved_base; |
| 475 | |
| 476 | DRM_DEBUG_KMS("Memory reserved for graphics device: %zuK, usable: %luK\n", |
| 477 | ggtt->stolen_size >> 10, |
| 478 | (ggtt->stolen_size - reserved_total) >> 10); |
| 479 | |
| 480 | ggtt->stolen_usable_size = ggtt->stolen_size - reserved_total; |
| 481 | |
| 482 | /* |
| 483 | * Basic memrange allocator for stolen space. |
| 484 | * |
| 485 | * TODO: Notice that some platforms require us to not use the first page |
| 486 | * of the stolen memory but their BIOSes may still put the framebuffer |
| 487 | * on the first page. So we don't reserve this page for now because of |
| 488 | * that. Our current solution is to just prevent new nodes from being |
| 489 | * inserted on the first page - see the check we have at |
| 490 | * i915_gem_stolen_insert_node_in_range(). We may want to fix the fbcon |
| 491 | * problem later. |
| 492 | */ |
| 493 | drm_mm_init(&dev_priv->mm.stolen, 0, ggtt->stolen_usable_size); |
| 494 | |
| 495 | return 0; |
| 496 | } |
| 497 | |
| 498 | static struct sg_table * |
| 499 | i915_pages_create_for_stolen(struct drm_device *dev, |
| 500 | u32 offset, u32 size) |
| 501 | { |
| 502 | struct drm_i915_private *dev_priv = to_i915(dev); |
| 503 | struct i915_ggtt *ggtt = &dev_priv->ggtt; |
| 504 | struct sg_table *st; |
| 505 | struct scatterlist *sg; |
| 506 | |
| 507 | DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size); |
| 508 | BUG_ON(offset > ggtt->stolen_size - size); |
| 509 | |
| 510 | /* We hide that we have no struct page backing our stolen object |
| 511 | * by wrapping the contiguous physical allocation with a fake |
| 512 | * dma mapping in a single scatterlist. |
| 513 | */ |
| 514 | |
| 515 | st = kmalloc(sizeof(*st), GFP_KERNEL); |
| 516 | if (st == NULL) |
| 517 | return NULL; |
| 518 | |
| 519 | if (sg_alloc_table(st, 1, GFP_KERNEL)) { |
| 520 | kfree(st); |
| 521 | return NULL; |
| 522 | } |
| 523 | |
| 524 | sg = st->sgl; |
| 525 | sg->offset = 0; |
| 526 | sg->length = size; |
| 527 | |
| 528 | sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset; |
| 529 | sg_dma_len(sg) = size; |
| 530 | |
| 531 | return st; |
| 532 | } |
| 533 | |
| 534 | static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj) |
| 535 | { |
| 536 | BUG(); |
| 537 | return -EINVAL; |
| 538 | } |
| 539 | |
| 540 | static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj) |
| 541 | { |
| 542 | /* Should only be called during free */ |
| 543 | sg_free_table(obj->pages); |
| 544 | kfree(obj->pages); |
| 545 | } |
| 546 | |
| 547 | |
| 548 | static void |
| 549 | i915_gem_object_release_stolen(struct drm_i915_gem_object *obj) |
| 550 | { |
| 551 | struct drm_i915_private *dev_priv = obj->base.dev->dev_private; |
| 552 | |
| 553 | if (obj->stolen) { |
| 554 | i915_gem_stolen_remove_node(dev_priv, obj->stolen); |
| 555 | kfree(obj->stolen); |
| 556 | obj->stolen = NULL; |
| 557 | } |
| 558 | } |
| 559 | static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = { |
| 560 | .get_pages = i915_gem_object_get_pages_stolen, |
| 561 | .put_pages = i915_gem_object_put_pages_stolen, |
| 562 | .release = i915_gem_object_release_stolen, |
| 563 | }; |
| 564 | |
| 565 | static struct drm_i915_gem_object * |
| 566 | _i915_gem_object_create_stolen(struct drm_device *dev, |
| 567 | struct drm_mm_node *stolen) |
| 568 | { |
| 569 | struct drm_i915_gem_object *obj; |
| 570 | |
| 571 | obj = i915_gem_object_alloc(dev); |
| 572 | if (obj == NULL) |
| 573 | return NULL; |
| 574 | |
| 575 | drm_gem_private_object_init(dev, &obj->base, stolen->size); |
| 576 | i915_gem_object_init(obj, &i915_gem_object_stolen_ops); |
| 577 | |
| 578 | obj->pages = i915_pages_create_for_stolen(dev, |
| 579 | stolen->start, stolen->size); |
| 580 | if (obj->pages == NULL) |
| 581 | goto cleanup; |
| 582 | |
| 583 | obj->get_page.sg = obj->pages->sgl; |
| 584 | obj->get_page.last = 0; |
| 585 | |
| 586 | i915_gem_object_pin_pages(obj); |
| 587 | obj->stolen = stolen; |
| 588 | |
| 589 | obj->base.read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT; |
| 590 | obj->cache_level = HAS_LLC(dev) ? I915_CACHE_LLC : I915_CACHE_NONE; |
| 591 | |
| 592 | return obj; |
| 593 | |
| 594 | cleanup: |
| 595 | i915_gem_object_free(obj); |
| 596 | return NULL; |
| 597 | } |
| 598 | |
| 599 | struct drm_i915_gem_object * |
| 600 | i915_gem_object_create_stolen(struct drm_device *dev, u32 size) |
| 601 | { |
| 602 | struct drm_i915_private *dev_priv = dev->dev_private; |
| 603 | struct drm_i915_gem_object *obj; |
| 604 | struct drm_mm_node *stolen; |
| 605 | int ret; |
| 606 | |
| 607 | if (!drm_mm_initialized(&dev_priv->mm.stolen)) |
| 608 | return NULL; |
| 609 | |
| 610 | DRM_DEBUG_KMS("creating stolen object: size=%x\n", size); |
| 611 | if (size == 0) |
| 612 | return NULL; |
| 613 | |
| 614 | stolen = kzalloc(sizeof(*stolen), GFP_KERNEL); |
| 615 | if (!stolen) |
| 616 | return NULL; |
| 617 | |
| 618 | ret = i915_gem_stolen_insert_node(dev_priv, stolen, size, 4096); |
| 619 | if (ret) { |
| 620 | kfree(stolen); |
| 621 | return NULL; |
| 622 | } |
| 623 | |
| 624 | obj = _i915_gem_object_create_stolen(dev, stolen); |
| 625 | if (obj) |
| 626 | return obj; |
| 627 | |
| 628 | i915_gem_stolen_remove_node(dev_priv, stolen); |
| 629 | kfree(stolen); |
| 630 | return NULL; |
| 631 | } |
| 632 | |
| 633 | struct drm_i915_gem_object * |
| 634 | i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev, |
| 635 | u32 stolen_offset, |
| 636 | u32 gtt_offset, |
| 637 | u32 size) |
| 638 | { |
| 639 | struct drm_i915_private *dev_priv = to_i915(dev); |
| 640 | struct i915_ggtt *ggtt = &dev_priv->ggtt; |
| 641 | struct drm_i915_gem_object *obj; |
| 642 | struct drm_mm_node *stolen; |
| 643 | struct i915_vma *vma; |
| 644 | int ret; |
| 645 | |
| 646 | if (!drm_mm_initialized(&dev_priv->mm.stolen)) |
| 647 | return NULL; |
| 648 | |
| 649 | lockdep_assert_held(&dev->struct_mutex); |
| 650 | |
| 651 | DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n", |
| 652 | stolen_offset, gtt_offset, size); |
| 653 | |
| 654 | /* KISS and expect everything to be page-aligned */ |
| 655 | if (WARN_ON(size == 0) || WARN_ON(size & 4095) || |
| 656 | WARN_ON(stolen_offset & 4095)) |
| 657 | return NULL; |
| 658 | |
| 659 | stolen = kzalloc(sizeof(*stolen), GFP_KERNEL); |
| 660 | if (!stolen) |
| 661 | return NULL; |
| 662 | |
| 663 | stolen->start = stolen_offset; |
| 664 | stolen->size = size; |
| 665 | mutex_lock(&dev_priv->mm.stolen_lock); |
| 666 | ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen); |
| 667 | mutex_unlock(&dev_priv->mm.stolen_lock); |
| 668 | if (ret) { |
| 669 | DRM_DEBUG_KMS("failed to allocate stolen space\n"); |
| 670 | kfree(stolen); |
| 671 | return NULL; |
| 672 | } |
| 673 | |
| 674 | obj = _i915_gem_object_create_stolen(dev, stolen); |
| 675 | if (obj == NULL) { |
| 676 | DRM_DEBUG_KMS("failed to allocate stolen object\n"); |
| 677 | i915_gem_stolen_remove_node(dev_priv, stolen); |
| 678 | kfree(stolen); |
| 679 | return NULL; |
| 680 | } |
| 681 | |
| 682 | /* Some objects just need physical mem from stolen space */ |
| 683 | if (gtt_offset == I915_GTT_OFFSET_NONE) |
| 684 | return obj; |
| 685 | |
| 686 | vma = i915_gem_obj_lookup_or_create_vma(obj, &ggtt->base); |
| 687 | if (IS_ERR(vma)) { |
| 688 | ret = PTR_ERR(vma); |
| 689 | goto err; |
| 690 | } |
| 691 | |
| 692 | /* To simplify the initialisation sequence between KMS and GTT, |
| 693 | * we allow construction of the stolen object prior to |
| 694 | * setting up the GTT space. The actual reservation will occur |
| 695 | * later. |
| 696 | */ |
| 697 | vma->node.start = gtt_offset; |
| 698 | vma->node.size = size; |
| 699 | if (drm_mm_initialized(&ggtt->base.mm)) { |
| 700 | ret = drm_mm_reserve_node(&ggtt->base.mm, &vma->node); |
| 701 | if (ret) { |
| 702 | DRM_DEBUG_KMS("failed to allocate stolen GTT space\n"); |
| 703 | goto err; |
| 704 | } |
| 705 | |
| 706 | vma->bound |= GLOBAL_BIND; |
| 707 | __i915_vma_set_map_and_fenceable(vma); |
| 708 | list_add_tail(&vma->vm_link, &ggtt->base.inactive_list); |
| 709 | } |
| 710 | |
| 711 | list_add_tail(&obj->global_list, &dev_priv->mm.bound_list); |
| 712 | i915_gem_object_pin_pages(obj); |
| 713 | |
| 714 | return obj; |
| 715 | |
| 716 | err: |
| 717 | drm_gem_object_unreference(&obj->base); |
| 718 | return NULL; |
| 719 | } |