drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c

   1 /*
   2  * Copyright 2016 Advanced Micro Devices, Inc.
   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 shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  * Authors: Christian König
  23  */
  24
  25 #include <linux/dma-mapping.h>
  26 #include <drm/ttm/ttm_range_manager.h>
  27
  28 #include "amdgpu.h"
  29 #include "amdgpu_vm.h"
  30 #include "amdgpu_res_cursor.h"
  31 #include "amdgpu_atomfirmware.h"
  32 #include "atom.h"
  33
  34 struct amdgpu_vram_reservation {
  35         u64 start;
  36         u64 size;
  37         struct list_head allocated;
  38         struct list_head blocks;
  39 };
  40
  41 static inline struct amdgpu_vram_mgr *
  42 to_vram_mgr(struct ttm_resource_manager *man)
  43 {
  44         return container_of(man, struct amdgpu_vram_mgr, manager);
  45 }
  46
  47 static inline struct amdgpu_device *
  48 to_amdgpu_device(struct amdgpu_vram_mgr *mgr)
  49 {
  50         return container_of(mgr, struct amdgpu_device, mman.vram_mgr);
  51 }
  52
  53 static inline struct drm_buddy_block *
  54 amdgpu_vram_mgr_first_block(struct list_head *list)
  55 {
  56         return list_first_entry_or_null(list, struct drm_buddy_block, link);
  57 }
  58
  59 static inline bool amdgpu_is_vram_mgr_blocks_contiguous(struct list_head *head)
  60 {
  61         struct drm_buddy_block *block;
  62         u64 start, size;
  63
  64         block = amdgpu_vram_mgr_first_block(head);
  65         if (!block)
  66                 return false;
  67
  68         while (head != block->link.next) {
  69                 start = amdgpu_vram_mgr_block_start(block);
  70                 size = amdgpu_vram_mgr_block_size(block);
  71
  72                 block = list_entry(block->link.next, struct drm_buddy_block, link);
  73                 if (start + size != amdgpu_vram_mgr_block_start(block))
  74                         return false;
  75         }
  76
  77         return true;
  78 }
  79
  80 static inline u64 amdgpu_vram_mgr_blocks_size(struct list_head *head)
  81 {
  82         struct drm_buddy_block *block;
  83         u64 size = 0;
  84
  85         list_for_each_entry(block, head, link)
  86                 size += amdgpu_vram_mgr_block_size(block);
  87
  88         return size;
  89 }
  90
  91 /**
  92  * DOC: mem_info_vram_total
  93  *
  94  * The amdgpu driver provides a sysfs API for reporting current total VRAM
  95  * available on the device
  96  * The file mem_info_vram_total is used for this and returns the total
  97  * amount of VRAM in bytes
  98  */
  99 static ssize_t amdgpu_mem_info_vram_total_show(struct device *dev,
 100                 struct device_attribute *attr, char *buf)
 101 {
 102         struct drm_device *ddev = dev_get_drvdata(dev);
 103         struct amdgpu_device *adev = drm_to_adev(ddev);
 104
 105         return sysfs_emit(buf, "%llu\n", adev->gmc.real_vram_size);
 106 }
 107
 108 /**
 109  * DOC: mem_info_vis_vram_total
 110  *
 111  * The amdgpu driver provides a sysfs API for reporting current total
 112  * visible VRAM available on the device
 113  * The file mem_info_vis_vram_total is used for this and returns the total
 114  * amount of visible VRAM in bytes
 115  */
 116 static ssize_t amdgpu_mem_info_vis_vram_total_show(struct device *dev,
 117                 struct device_attribute *attr, char *buf)
 118 {
 119         struct drm_device *ddev = dev_get_drvdata(dev);
 120         struct amdgpu_device *adev = drm_to_adev(ddev);
 121
 122         return sysfs_emit(buf, "%llu\n", adev->gmc.visible_vram_size);
 123 }
 124
 125 /**
 126  * DOC: mem_info_vram_used
 127  *
 128  * The amdgpu driver provides a sysfs API for reporting current total VRAM
 129  * available on the device
 130  * The file mem_info_vram_used is used for this and returns the total
 131  * amount of currently used VRAM in bytes
 132  */
 133 static ssize_t amdgpu_mem_info_vram_used_show(struct device *dev,
 134                                               struct device_attribute *attr,
 135                                               char *buf)
 136 {
 137         struct drm_device *ddev = dev_get_drvdata(dev);
 138         struct amdgpu_device *adev = drm_to_adev(ddev);
 139         struct ttm_resource_manager *man = &adev->mman.vram_mgr.manager;
 140
 141         return sysfs_emit(buf, "%llu\n", ttm_resource_manager_usage(man));
 142 }
 143
 144 /**
 145  * DOC: mem_info_vis_vram_used
 146  *
 147  * The amdgpu driver provides a sysfs API for reporting current total of
 148  * used visible VRAM
 149  * The file mem_info_vis_vram_used is used for this and returns the total
 150  * amount of currently used visible VRAM in bytes
 151  */
 152 static ssize_t amdgpu_mem_info_vis_vram_used_show(struct device *dev,
 153                                                   struct device_attribute *attr,
 154                                                   char *buf)
 155 {
 156         struct drm_device *ddev = dev_get_drvdata(dev);
 157         struct amdgpu_device *adev = drm_to_adev(ddev);
 158
 159         return sysfs_emit(buf, "%llu\n",
 160                           amdgpu_vram_mgr_vis_usage(&adev->mman.vram_mgr));
 161 }
 162
 163 /**
 164  * DOC: mem_info_vram_vendor
 165  *
 166  * The amdgpu driver provides a sysfs API for reporting the vendor of the
 167  * installed VRAM
 168  * The file mem_info_vram_vendor is used for this and returns the name of the
 169  * vendor.
 170  */
 171 static ssize_t amdgpu_mem_info_vram_vendor(struct device *dev,
 172                                            struct device_attribute *attr,
 173                                            char *buf)
 174 {
 175         struct drm_device *ddev = dev_get_drvdata(dev);
 176         struct amdgpu_device *adev = drm_to_adev(ddev);
 177
 178         switch (adev->gmc.vram_vendor) {
 179         case SAMSUNG:
 180                 return sysfs_emit(buf, "samsung\n");
 181         case INFINEON:
 182                 return sysfs_emit(buf, "infineon\n");
 183         case ELPIDA:
 184                 return sysfs_emit(buf, "elpida\n");
 185         case ETRON:
 186                 return sysfs_emit(buf, "etron\n");
 187         case NANYA:
 188                 return sysfs_emit(buf, "nanya\n");
 189         case HYNIX:
 190                 return sysfs_emit(buf, "hynix\n");
 191         case MOSEL:
 192                 return sysfs_emit(buf, "mosel\n");
 193         case WINBOND:
 194                 return sysfs_emit(buf, "winbond\n");
 195         case ESMT:
 196                 return sysfs_emit(buf, "esmt\n");
 197         case MICRON:
 198                 return sysfs_emit(buf, "micron\n");
 199         default:
 200                 return sysfs_emit(buf, "unknown\n");
 201         }
 202 }
 203
 204 static DEVICE_ATTR(mem_info_vram_total, S_IRUGO,
 205                    amdgpu_mem_info_vram_total_show, NULL);
 206 static DEVICE_ATTR(mem_info_vis_vram_total, S_IRUGO,
 207                    amdgpu_mem_info_vis_vram_total_show,NULL);
 208 static DEVICE_ATTR(mem_info_vram_used, S_IRUGO,
 209                    amdgpu_mem_info_vram_used_show, NULL);
 210 static DEVICE_ATTR(mem_info_vis_vram_used, S_IRUGO,
 211                    amdgpu_mem_info_vis_vram_used_show, NULL);
 212 static DEVICE_ATTR(mem_info_vram_vendor, S_IRUGO,
 213                    amdgpu_mem_info_vram_vendor, NULL);
 214
 215 static struct attribute *amdgpu_vram_mgr_attributes[] = {
 216         &dev_attr_mem_info_vram_total.attr,
 217         &dev_attr_mem_info_vis_vram_total.attr,
 218         &dev_attr_mem_info_vram_used.attr,
 219         &dev_attr_mem_info_vis_vram_used.attr,
 220         &dev_attr_mem_info_vram_vendor.attr,
 221         NULL
 222 };
 223
 224 const struct attribute_group amdgpu_vram_mgr_attr_group = {
 225         .attrs = amdgpu_vram_mgr_attributes
 226 };
 227
 228 /**
 229  * amdgpu_vram_mgr_vis_size - Calculate visible block size
 230  *
 231  * @adev: amdgpu_device pointer
 232  * @block: DRM BUDDY block structure
 233  *
 234  * Calculate how many bytes of the DRM BUDDY block are inside visible VRAM
 235  */
 236 static u64 amdgpu_vram_mgr_vis_size(struct amdgpu_device *adev,
 237                                     struct drm_buddy_block *block)
 238 {
 239         u64 start = amdgpu_vram_mgr_block_start(block);
 240         u64 end = start + amdgpu_vram_mgr_block_size(block);
 241
 242         if (start >= adev->gmc.visible_vram_size)
 243                 return 0;
 244
 245         return (end > adev->gmc.visible_vram_size ?
 246                 adev->gmc.visible_vram_size : end) - start;
 247 }
 248
 249 /**
 250  * amdgpu_vram_mgr_bo_visible_size - CPU visible BO size
 251  *
 252  * @bo: &amdgpu_bo buffer object (must be in VRAM)
 253  *
 254  * Returns:
 255  * How much of the given &amdgpu_bo buffer object lies in CPU visible VRAM.
 256  */
 257 u64 amdgpu_vram_mgr_bo_visible_size(struct amdgpu_bo *bo)
 258 {
 259         struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
 260         struct ttm_resource *res = bo->tbo.resource;
 261         struct amdgpu_vram_mgr_resource *vres = to_amdgpu_vram_mgr_resource(res);
 262         struct drm_buddy_block *block;
 263         u64 usage = 0;
 264
 265         if (amdgpu_gmc_vram_full_visible(&adev->gmc))
 266                 return amdgpu_bo_size(bo);
 267
 268         if (res->start >= adev->gmc.visible_vram_size >> PAGE_SHIFT)
 269                 return 0;
 270
 271         list_for_each_entry(block, &vres->blocks, link)
 272                 usage += amdgpu_vram_mgr_vis_size(adev, block);
 273
 274         return usage;
 275 }
 276
 277 /* Commit the reservation of VRAM pages */
 278 static void amdgpu_vram_mgr_do_reserve(struct ttm_resource_manager *man)
 279 {
 280         struct amdgpu_vram_mgr *mgr = to_vram_mgr(man);
 281         struct amdgpu_device *adev = to_amdgpu_device(mgr);
 282         struct drm_buddy *mm = &mgr->mm;
 283         struct amdgpu_vram_reservation *rsv, *temp;
 284         struct drm_buddy_block *block;
 285         uint64_t vis_usage;
 286
 287         list_for_each_entry_safe(rsv, temp, &mgr->reservations_pending, blocks) {
 288                 if (drm_buddy_alloc_blocks(mm, rsv->start, rsv->start + rsv->size,
 289                                            rsv->size, mm->chunk_size, &rsv->allocated,
 290                                            DRM_BUDDY_RANGE_ALLOCATION))
 291                         continue;
 292
 293                 block = amdgpu_vram_mgr_first_block(&rsv->allocated);
 294                 if (!block)
 295                         continue;
 296
 297                 dev_dbg(adev->dev, "Reservation 0x%llx - %lld, Succeeded\n",
 298                         rsv->start, rsv->size);
 299
 300                 vis_usage = amdgpu_vram_mgr_vis_size(adev, block);
 301                 atomic64_add(vis_usage, &mgr->vis_usage);
 302                 spin_lock(&man->bdev->lru_lock);
 303                 man->usage += rsv->size;
 304                 spin_unlock(&man->bdev->lru_lock);
 305                 list_move(&rsv->blocks, &mgr->reserved_pages);
 306         }
 307 }
 308
 309 /**
 310  * amdgpu_vram_mgr_reserve_range - Reserve a range from VRAM
 311  *
 312  * @mgr: amdgpu_vram_mgr pointer
 313  * @start: start address of the range in VRAM
 314  * @size: size of the range
 315  *
 316  * Reserve memory from start address with the specified size in VRAM
 317  */
 318 int amdgpu_vram_mgr_reserve_range(struct amdgpu_vram_mgr *mgr,
 319                                   uint64_t start, uint64_t size)
 320 {
 321         struct amdgpu_vram_reservation *rsv;
 322
 323         rsv = kzalloc(sizeof(*rsv), GFP_KERNEL);
 324         if (!rsv)
 325                 return -ENOMEM;
 326
 327         INIT_LIST_HEAD(&rsv->allocated);
 328         INIT_LIST_HEAD(&rsv->blocks);
 329
 330         rsv->start = start;
 331         rsv->size = size;
 332
 333         mutex_lock(&mgr->lock);
 334         list_add_tail(&rsv->blocks, &mgr->reservations_pending);
 335         amdgpu_vram_mgr_do_reserve(&mgr->manager);
 336         mutex_unlock(&mgr->lock);
 337
 338         return 0;
 339 }
 340
 341 /**
 342  * amdgpu_vram_mgr_query_page_status - query the reservation status
 343  *
 344  * @mgr: amdgpu_vram_mgr pointer
 345  * @start: start address of a page in VRAM
 346  *
 347  * Returns:
 348  *      -EBUSY: the page is still hold and in pending list
 349  *      0: the page has been reserved
 350  *      -ENOENT: the input page is not a reservation
 351  */
 352 int amdgpu_vram_mgr_query_page_status(struct amdgpu_vram_mgr *mgr,
 353                                       uint64_t start)
 354 {
 355         struct amdgpu_vram_reservation *rsv;
 356         int ret;
 357
 358         mutex_lock(&mgr->lock);
 359
 360         list_for_each_entry(rsv, &mgr->reservations_pending, blocks) {
 361                 if (rsv->start <= start &&
 362                     (start < (rsv->start + rsv->size))) {
 363                         ret = -EBUSY;
 364                         goto out;
 365                 }
 366         }
 367
 368         list_for_each_entry(rsv, &mgr->reserved_pages, blocks) {
 369                 if (rsv->start <= start &&
 370                     (start < (rsv->start + rsv->size))) {
 371                         ret = 0;
 372                         goto out;
 373                 }
 374         }
 375
 376         ret = -ENOENT;
 377 out:
 378         mutex_unlock(&mgr->lock);
 379         return ret;
 380 }
 381
 382 static void amdgpu_dummy_vram_mgr_debug(struct ttm_resource_manager *man,
 383                                   struct drm_printer *printer)
 384 {
 385         DRM_DEBUG_DRIVER("Dummy vram mgr debug\n");
 386 }
 387
 388 static bool amdgpu_dummy_vram_mgr_compatible(struct ttm_resource_manager *man,
 389                                        struct ttm_resource *res,
 390                                        const struct ttm_place *place,
 391                                        size_t size)
 392 {
 393         DRM_DEBUG_DRIVER("Dummy vram mgr compatible\n");
 394         return false;
 395 }
 396
 397 static bool amdgpu_dummy_vram_mgr_intersects(struct ttm_resource_manager *man,
 398                                        struct ttm_resource *res,
 399                                        const struct ttm_place *place,
 400                                        size_t size)
 401 {
 402         DRM_DEBUG_DRIVER("Dummy vram mgr intersects\n");
 403         return true;
 404 }
 405
 406 static void amdgpu_dummy_vram_mgr_del(struct ttm_resource_manager *man,
 407                                 struct ttm_resource *res)
 408 {
 409         DRM_DEBUG_DRIVER("Dummy vram mgr deleted\n");
 410 }
 411
 412 static int amdgpu_dummy_vram_mgr_new(struct ttm_resource_manager *man,
 413                                struct ttm_buffer_object *tbo,
 414                                const struct ttm_place *place,
 415                                struct ttm_resource **res)
 416 {
 417         DRM_DEBUG_DRIVER("Dummy vram mgr new\n");
 418         return -ENOSPC;
 419 }
 420
 421 /**
 422  * amdgpu_vram_mgr_new - allocate new ranges
 423  *
 424  * @man: TTM memory type manager
 425  * @tbo: TTM BO we need this range for
 426  * @place: placement flags and restrictions
 427  * @res: the resulting mem object
 428  *
 429  * Allocate VRAM for the given BO.
 430  */
 431 static int amdgpu_vram_mgr_new(struct ttm_resource_manager *man,
 432                                struct ttm_buffer_object *tbo,
 433                                const struct ttm_place *place,
 434                                struct ttm_resource **res)
 435 {
 436         struct amdgpu_vram_mgr *mgr = to_vram_mgr(man);
 437         struct amdgpu_device *adev = to_amdgpu_device(mgr);
 438         u64 vis_usage = 0, max_bytes, min_block_size;
 439         struct amdgpu_vram_mgr_resource *vres;
 440         u64 size, remaining_size, lpfn, fpfn;
 441         struct drm_buddy *mm = &mgr->mm;
 442         struct drm_buddy_block *block;
 443         unsigned long pages_per_block;
 444         int r;
 445
 446         lpfn = (u64)place->lpfn << PAGE_SHIFT;
 447         if (!lpfn)
 448                 lpfn = man->size;
 449
 450         fpfn = (u64)place->fpfn << PAGE_SHIFT;
 451
 452         max_bytes = adev->gmc.mc_vram_size;
 453         if (tbo->type != ttm_bo_type_kernel)
 454                 max_bytes -= AMDGPU_VM_RESERVED_VRAM;
 455
 456         if (place->flags & TTM_PL_FLAG_CONTIGUOUS) {
 457                 pages_per_block = ~0ul;
 458         } else {
 459 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 460                 pages_per_block = HPAGE_PMD_NR;
 461 #else
 462                 /* default to 2MB */
 463                 pages_per_block = 2UL << (20UL - PAGE_SHIFT);
 464 #endif
 465                 pages_per_block = max_t(uint32_t, pages_per_block,
 466                                         tbo->page_alignment);
 467         }
 468
 469         vres = kzalloc(sizeof(*vres), GFP_KERNEL);
 470         if (!vres)
 471                 return -ENOMEM;
 472
 473         ttm_resource_init(tbo, place, &vres->base);
 474
 475         /* bail out quickly if there's likely not enough VRAM for this BO */
 476         if (ttm_resource_manager_usage(man) > max_bytes) {
 477                 r = -ENOSPC;
 478                 goto error_fini;
 479         }
 480
 481         INIT_LIST_HEAD(&vres->blocks);
 482
 483         if (place->flags & TTM_PL_FLAG_TOPDOWN)
 484                 vres->flags |= DRM_BUDDY_TOPDOWN_ALLOCATION;
 485
 486         if (place->flags & TTM_PL_FLAG_CONTIGUOUS)
 487                 vres->flags |= DRM_BUDDY_CONTIGUOUS_ALLOCATION;
 488
 489         if (fpfn || lpfn != mgr->mm.size)
 490                 /* Allocate blocks in desired range */
 491                 vres->flags |= DRM_BUDDY_RANGE_ALLOCATION;
 492
 493         remaining_size = (u64)vres->base.size;
 494
 495         mutex_lock(&mgr->lock);
 496         while (remaining_size) {
 497                 if (tbo->page_alignment)
 498                         min_block_size = (u64)tbo->page_alignment << PAGE_SHIFT;
 499                 else
 500                         min_block_size = mgr->default_page_size;
 501
 502                 BUG_ON(min_block_size < mm->chunk_size);
 503
 504                 /* Limit maximum size to 2GiB due to SG table limitations */
 505                 size = min(remaining_size, 2ULL << 30);
 506
 507                 if ((size >= (u64)pages_per_block << PAGE_SHIFT) &&
 508                                 !(size & (((u64)pages_per_block << PAGE_SHIFT) - 1)))
 509                         min_block_size = (u64)pages_per_block << PAGE_SHIFT;
 510
 511                 r = drm_buddy_alloc_blocks(mm, fpfn,
 512                                            lpfn,
 513                                            size,
 514                                            min_block_size,
 515                                            &vres->blocks,
 516                                            vres->flags);
 517                 if (unlikely(r))
 518                         goto error_free_blocks;
 519
 520                 if (size > remaining_size)
 521                         remaining_size = 0;
 522                 else
 523                         remaining_size -= size;
 524         }
 525         mutex_unlock(&mgr->lock);
 526
 527         vres->base.start = 0;
 528         size = max_t(u64, amdgpu_vram_mgr_blocks_size(&vres->blocks),
 529                      vres->base.size);
 530         list_for_each_entry(block, &vres->blocks, link) {
 531                 unsigned long start;
 532
 533                 start = amdgpu_vram_mgr_block_start(block) +
 534                         amdgpu_vram_mgr_block_size(block);
 535                 start >>= PAGE_SHIFT;
 536
 537                 if (start > PFN_UP(size))
 538                         start -= PFN_UP(size);
 539                 else
 540                         start = 0;
 541                 vres->base.start = max(vres->base.start, start);
 542
 543                 vis_usage += amdgpu_vram_mgr_vis_size(adev, block);
 544         }
 545
 546         if (amdgpu_is_vram_mgr_blocks_contiguous(&vres->blocks))
 547                 vres->base.placement |= TTM_PL_FLAG_CONTIGUOUS;
 548
 549         if (adev->gmc.xgmi.connected_to_cpu)
 550                 vres->base.bus.caching = ttm_cached;
 551         else
 552                 vres->base.bus.caching = ttm_write_combined;
 553
 554         atomic64_add(vis_usage, &mgr->vis_usage);
 555         *res = &vres->base;
 556         return 0;
 557
 558 error_free_blocks:
 559         drm_buddy_free_list(mm, &vres->blocks);
 560         mutex_unlock(&mgr->lock);
 561 error_fini:
 562         ttm_resource_fini(man, &vres->base);
 563         kfree(vres);
 564
 565         return r;
 566 }
 567
 568 /**
 569  * amdgpu_vram_mgr_del - free ranges
 570  *
 571  * @man: TTM memory type manager
 572  * @res: TTM memory object
 573  *
 574  * Free the allocated VRAM again.
 575  */
 576 static void amdgpu_vram_mgr_del(struct ttm_resource_manager *man,
 577                                 struct ttm_resource *res)
 578 {
 579         struct amdgpu_vram_mgr_resource *vres = to_amdgpu_vram_mgr_resource(res);
 580         struct amdgpu_vram_mgr *mgr = to_vram_mgr(man);
 581         struct amdgpu_device *adev = to_amdgpu_device(mgr);
 582         struct drm_buddy *mm = &mgr->mm;
 583         struct drm_buddy_block *block;
 584         uint64_t vis_usage = 0;
 585
 586         mutex_lock(&mgr->lock);
 587         list_for_each_entry(block, &vres->blocks, link)
 588                 vis_usage += amdgpu_vram_mgr_vis_size(adev, block);
 589
 590         amdgpu_vram_mgr_do_reserve(man);
 591
 592         drm_buddy_free_list(mm, &vres->blocks);
 593         mutex_unlock(&mgr->lock);
 594
 595         atomic64_sub(vis_usage, &mgr->vis_usage);
 596
 597         ttm_resource_fini(man, res);
 598         kfree(vres);
 599 }
 600
 601 /**
 602  * amdgpu_vram_mgr_alloc_sgt - allocate and fill a sg table
 603  *
 604  * @adev: amdgpu device pointer
 605  * @res: TTM memory object
 606  * @offset: byte offset from the base of VRAM BO
 607  * @length: number of bytes to export in sg_table
 608  * @dev: the other device
 609  * @dir: dma direction
 610  * @sgt: resulting sg table
 611  *
 612  * Allocate and fill a sg table from a VRAM allocation.
 613  */
 614 int amdgpu_vram_mgr_alloc_sgt(struct amdgpu_device *adev,
 615                               struct ttm_resource *res,
 616                               u64 offset, u64 length,
 617                               struct device *dev,
 618                               enum dma_data_direction dir,
 619                               struct sg_table **sgt)
 620 {
 621         struct amdgpu_res_cursor cursor;
 622         struct scatterlist *sg;
 623         int num_entries = 0;
 624         int i, r;
 625
 626         *sgt = kmalloc(sizeof(**sgt), GFP_KERNEL);
 627         if (!*sgt)
 628                 return -ENOMEM;
 629
 630         /* Determine the number of DRM_BUDDY blocks to export */
 631         amdgpu_res_first(res, offset, length, &cursor);
 632         while (cursor.remaining) {
 633                 num_entries++;
 634                 amdgpu_res_next(&cursor, cursor.size);
 635         }
 636
 637         r = sg_alloc_table(*sgt, num_entries, GFP_KERNEL);
 638         if (r)
 639                 goto error_free;
 640
 641         /* Initialize scatterlist nodes of sg_table */
 642         for_each_sgtable_sg((*sgt), sg, i)
 643                 sg->length = 0;
 644
 645         /*
 646          * Walk down DRM_BUDDY blocks to populate scatterlist nodes
 647          * @note: Use iterator api to get first the DRM_BUDDY block
 648          * and the number of bytes from it. Access the following
 649          * DRM_BUDDY block(s) if more buffer needs to exported
 650          */
 651         amdgpu_res_first(res, offset, length, &cursor);
 652         for_each_sgtable_sg((*sgt), sg, i) {
 653                 phys_addr_t phys = cursor.start + adev->gmc.aper_base;
 654                 size_t size = cursor.size;
 655                 dma_addr_t addr;
 656
 657                 addr = dma_map_resource(dev, phys, size, dir,
 658                                         DMA_ATTR_SKIP_CPU_SYNC);
 659                 r = dma_mapping_error(dev, addr);
 660                 if (r)
 661                         goto error_unmap;
 662
 663                 sg_set_page(sg, NULL, size, 0);
 664                 sg_dma_address(sg) = addr;
 665                 sg_dma_len(sg) = size;
 666
 667                 amdgpu_res_next(&cursor, cursor.size);
 668         }
 669
 670         return 0;
 671
 672 error_unmap:
 673         for_each_sgtable_sg((*sgt), sg, i) {
 674                 if (!sg->length)
 675                         continue;
 676
 677                 dma_unmap_resource(dev, sg->dma_address,
 678                                    sg->length, dir,
 679                                    DMA_ATTR_SKIP_CPU_SYNC);
 680         }
 681         sg_free_table(*sgt);
 682
 683 error_free:
 684         kfree(*sgt);
 685         return r;
 686 }
 687
 688 /**
 689  * amdgpu_vram_mgr_free_sgt - allocate and fill a sg table
 690  *
 691  * @dev: device pointer
 692  * @dir: data direction of resource to unmap
 693  * @sgt: sg table to free
 694  *
 695  * Free a previously allocate sg table.
 696  */
 697 void amdgpu_vram_mgr_free_sgt(struct device *dev,
 698                               enum dma_data_direction dir,
 699                               struct sg_table *sgt)
 700 {
 701         struct scatterlist *sg;
 702         int i;
 703
 704         for_each_sgtable_sg(sgt, sg, i)
 705                 dma_unmap_resource(dev, sg->dma_address,
 706                                    sg->length, dir,
 707                                    DMA_ATTR_SKIP_CPU_SYNC);
 708         sg_free_table(sgt);
 709         kfree(sgt);
 710 }
 711
 712 /**
 713  * amdgpu_vram_mgr_vis_usage - how many bytes are used in the visible part
 714  *
 715  * @mgr: amdgpu_vram_mgr pointer
 716  *
 717  * Returns how many bytes are used in the visible part of VRAM
 718  */
 719 uint64_t amdgpu_vram_mgr_vis_usage(struct amdgpu_vram_mgr *mgr)
 720 {
 721         return atomic64_read(&mgr->vis_usage);
 722 }
 723
 724 /**
 725  * amdgpu_vram_mgr_intersects - test each drm buddy block for intersection
 726  *
 727  * @man: TTM memory type manager
 728  * @res: The resource to test
 729  * @place: The place to test against
 730  * @size: Size of the new allocation
 731  *
 732  * Test each drm buddy block for intersection for eviction decision.
 733  */
 734 static bool amdgpu_vram_mgr_intersects(struct ttm_resource_manager *man,
 735                                        struct ttm_resource *res,
 736                                        const struct ttm_place *place,
 737                                        size_t size)
 738 {
 739         struct amdgpu_vram_mgr_resource *mgr = to_amdgpu_vram_mgr_resource(res);
 740         struct drm_buddy_block *block;
 741
 742         /* Check each drm buddy block individually */
 743         list_for_each_entry(block, &mgr->blocks, link) {
 744                 unsigned long fpfn =
 745                         amdgpu_vram_mgr_block_start(block) >> PAGE_SHIFT;
 746                 unsigned long lpfn = fpfn +
 747                         (amdgpu_vram_mgr_block_size(block) >> PAGE_SHIFT);
 748
 749                 if (place->fpfn < lpfn &&
 750                     (!place->lpfn || place->lpfn > fpfn))
 751                         return true;
 752         }
 753
 754         return false;
 755 }
 756
 757 /**
 758  * amdgpu_vram_mgr_compatible - test each drm buddy block for compatibility
 759  *
 760  * @man: TTM memory type manager
 761  * @res: The resource to test
 762  * @place: The place to test against
 763  * @size: Size of the new allocation
 764  *
 765  * Test each drm buddy block for placement compatibility.
 766  */
 767 static bool amdgpu_vram_mgr_compatible(struct ttm_resource_manager *man,
 768                                        struct ttm_resource *res,
 769                                        const struct ttm_place *place,
 770                                        size_t size)
 771 {
 772         struct amdgpu_vram_mgr_resource *mgr = to_amdgpu_vram_mgr_resource(res);
 773         struct drm_buddy_block *block;
 774
 775         /* Check each drm buddy block individually */
 776         list_for_each_entry(block, &mgr->blocks, link) {
 777                 unsigned long fpfn =
 778                         amdgpu_vram_mgr_block_start(block) >> PAGE_SHIFT;
 779                 unsigned long lpfn = fpfn +
 780                         (amdgpu_vram_mgr_block_size(block) >> PAGE_SHIFT);
 781
 782                 if (fpfn < place->fpfn ||
 783                     (place->lpfn && lpfn > place->lpfn))
 784                         return false;
 785         }
 786
 787         return true;
 788 }
 789
 790 /**
 791  * amdgpu_vram_mgr_debug - dump VRAM table
 792  *
 793  * @man: TTM memory type manager
 794  * @printer: DRM printer to use
 795  *
 796  * Dump the table content using printk.
 797  */
 798 static void amdgpu_vram_mgr_debug(struct ttm_resource_manager *man,
 799                                   struct drm_printer *printer)
 800 {
 801         struct amdgpu_vram_mgr *mgr = to_vram_mgr(man);
 802         struct drm_buddy *mm = &mgr->mm;
 803         struct amdgpu_vram_reservation *rsv;
 804
 805         drm_printf(printer, "  vis usage:%llu\n",
 806                    amdgpu_vram_mgr_vis_usage(mgr));
 807
 808         mutex_lock(&mgr->lock);
 809         drm_printf(printer, "default_page_size: %lluKiB\n",
 810                    mgr->default_page_size >> 10);
 811
 812         drm_buddy_print(mm, printer);
 813
 814         drm_printf(printer, "reserved:\n");
 815         list_for_each_entry(rsv, &mgr->reserved_pages, blocks)
 816                 drm_printf(printer, "%#018llx-%#018llx: %llu\n",
 817                         rsv->start, rsv->start + rsv->size, rsv->size);
 818         mutex_unlock(&mgr->lock);
 819 }
 820
 821 static const struct ttm_resource_manager_func amdgpu_dummy_vram_mgr_func = {
 822         .alloc  = amdgpu_dummy_vram_mgr_new,
 823         .free   = amdgpu_dummy_vram_mgr_del,
 824         .intersects = amdgpu_dummy_vram_mgr_intersects,
 825         .compatible = amdgpu_dummy_vram_mgr_compatible,
 826         .debug  = amdgpu_dummy_vram_mgr_debug
 827 };
 828
 829 static const struct ttm_resource_manager_func amdgpu_vram_mgr_func = {
 830         .alloc  = amdgpu_vram_mgr_new,
 831         .free   = amdgpu_vram_mgr_del,
 832         .intersects = amdgpu_vram_mgr_intersects,
 833         .compatible = amdgpu_vram_mgr_compatible,
 834         .debug  = amdgpu_vram_mgr_debug
 835 };
 836
 837 /**
 838  * amdgpu_vram_mgr_init - init VRAM manager and DRM MM
 839  *
 840  * @adev: amdgpu_device pointer
 841  *
 842  * Allocate and initialize the VRAM manager.
 843  */
 844 int amdgpu_vram_mgr_init(struct amdgpu_device *adev)
 845 {
 846         struct amdgpu_vram_mgr *mgr = &adev->mman.vram_mgr;
 847         struct ttm_resource_manager *man = &mgr->manager;
 848         int err;
 849
 850         ttm_resource_manager_init(man, &adev->mman.bdev,
 851                                   adev->gmc.real_vram_size);
 852
 853         mutex_init(&mgr->lock);
 854         INIT_LIST_HEAD(&mgr->reservations_pending);
 855         INIT_LIST_HEAD(&mgr->reserved_pages);
 856         mgr->default_page_size = PAGE_SIZE;
 857
 858         if (!adev->gmc.is_app_apu) {
 859                 man->func = &amdgpu_vram_mgr_func;
 860
 861                 err = drm_buddy_init(&mgr->mm, man->size, PAGE_SIZE);
 862                 if (err)
 863                         return err;
 864         } else {
 865                 man->func = &amdgpu_dummy_vram_mgr_func;
 866                 DRM_INFO("Setup dummy vram mgr\n");
 867         }
 868
 869         ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_VRAM, &mgr->manager);
 870         ttm_resource_manager_set_used(man, true);
 871         return 0;
 872 }
 873
 874 /**
 875  * amdgpu_vram_mgr_fini - free and destroy VRAM manager
 876  *
 877  * @adev: amdgpu_device pointer
 878  *
 879  * Destroy and free the VRAM manager, returns -EBUSY if ranges are still
 880  * allocated inside it.
 881  */
 882 void amdgpu_vram_mgr_fini(struct amdgpu_device *adev)
 883 {
 884         struct amdgpu_vram_mgr *mgr = &adev->mman.vram_mgr;
 885         struct ttm_resource_manager *man = &mgr->manager;
 886         int ret;
 887         struct amdgpu_vram_reservation *rsv, *temp;
 888
 889         ttm_resource_manager_set_used(man, false);
 890
 891         ret = ttm_resource_manager_evict_all(&adev->mman.bdev, man);
 892         if (ret)
 893                 return;
 894
 895         mutex_lock(&mgr->lock);
 896         list_for_each_entry_safe(rsv, temp, &mgr->reservations_pending, blocks)
 897                 kfree(rsv);
 898
 899         list_for_each_entry_safe(rsv, temp, &mgr->reserved_pages, blocks) {
 900                 drm_buddy_free_list(&mgr->mm, &rsv->allocated);
 901                 kfree(rsv);
 902         }
 903         if (!adev->gmc.is_app_apu)
 904                 drm_buddy_fini(&mgr->mm);
 905         mutex_unlock(&mgr->lock);
 906
 907         ttm_resource_manager_cleanup(man);
 908         ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_VRAM, NULL);
 909 }