drivers/gpu/drm/loongson/lsdc_ttm.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2023 Loongson Technology Corporation Limited
   4  */
   5
   6 #include <drm/drm_drv.h>
   7 #include <drm/drm_file.h>
   8 #include <drm/drm_gem.h>
   9 #include <drm/drm_managed.h>
  10 #include <drm/drm_prime.h>
  11
  12 #include "lsdc_drv.h"
  13 #include "lsdc_ttm.h"
  14
  15 const char *lsdc_mem_type_to_str(uint32_t mem_type)
  16 {
  17         switch (mem_type) {
  18         case TTM_PL_VRAM:
  19                 return "VRAM";
  20         case TTM_PL_TT:
  21                 return "GTT";
  22         case TTM_PL_SYSTEM:
  23                 return "SYSTEM";
  24         default:
  25                 break;
  26         }
  27
  28         return "Unknown";
  29 }
  30
  31 const char *lsdc_domain_to_str(u32 domain)
  32 {
  33         switch (domain) {
  34         case LSDC_GEM_DOMAIN_VRAM:
  35                 return "VRAM";
  36         case LSDC_GEM_DOMAIN_GTT:
  37                 return "GTT";
  38         case LSDC_GEM_DOMAIN_SYSTEM:
  39                 return "SYSTEM";
  40         default:
  41                 break;
  42         }
  43
  44         return "Unknown";
  45 }
  46
  47 static void lsdc_bo_set_placement(struct lsdc_bo *lbo, u32 domain)
  48 {
  49         u32 c = 0;
  50         u32 pflags = 0;
  51         u32 i;
  52
  53         if (lbo->tbo.base.size <= PAGE_SIZE)
  54                 pflags |= TTM_PL_FLAG_TOPDOWN;
  55
  56         lbo->placement.placement = lbo->placements;
  57
  58         if (domain & LSDC_GEM_DOMAIN_VRAM) {
  59                 lbo->placements[c].mem_type = TTM_PL_VRAM;
  60                 lbo->placements[c++].flags = pflags;
  61         }
  62
  63         if (domain & LSDC_GEM_DOMAIN_GTT) {
  64                 lbo->placements[c].mem_type = TTM_PL_TT;
  65                 lbo->placements[c++].flags = pflags;
  66         }
  67
  68         if (domain & LSDC_GEM_DOMAIN_SYSTEM) {
  69                 lbo->placements[c].mem_type = TTM_PL_SYSTEM;
  70                 lbo->placements[c++].flags = 0;
  71         }
  72
  73         if (!c) {
  74                 lbo->placements[c].mem_type = TTM_PL_SYSTEM;
  75                 lbo->placements[c++].flags = 0;
  76         }
  77
  78         lbo->placement.num_placement = c;
  79
  80         for (i = 0; i < c; ++i) {
  81                 lbo->placements[i].fpfn = 0;
  82                 lbo->placements[i].lpfn = 0;
  83         }
  84 }
  85
  86 static void lsdc_ttm_tt_destroy(struct ttm_device *bdev, struct ttm_tt *tt)
  87 {
  88         ttm_tt_fini(tt);
  89         kfree(tt);
  90 }
  91
  92 static struct ttm_tt *
  93 lsdc_ttm_tt_create(struct ttm_buffer_object *tbo, uint32_t page_flags)
  94 {
  95         struct ttm_tt *tt;
  96         int ret;
  97
  98         tt = kzalloc(sizeof(*tt), GFP_KERNEL);
  99         if (!tt)
 100                 return NULL;
 101
 102         ret = ttm_sg_tt_init(tt, tbo, page_flags, ttm_cached);
 103         if (ret < 0) {
 104                 kfree(tt);
 105                 return NULL;
 106         }
 107
 108         return tt;
 109 }
 110
 111 static int lsdc_ttm_tt_populate(struct ttm_device *bdev,
 112                                 struct ttm_tt *ttm,
 113                                 struct ttm_operation_ctx *ctx)
 114 {
 115         bool slave = !!(ttm->page_flags & TTM_TT_FLAG_EXTERNAL);
 116
 117         if (slave && ttm->sg) {
 118                 drm_prime_sg_to_dma_addr_array(ttm->sg,
 119                                                ttm->dma_address,
 120                                                ttm->num_pages);
 121
 122                 return 0;
 123         }
 124
 125         return ttm_pool_alloc(&bdev->pool, ttm, ctx);
 126 }
 127
 128 static void lsdc_ttm_tt_unpopulate(struct ttm_device *bdev,
 129                                    struct ttm_tt *ttm)
 130 {
 131         bool slave = !!(ttm->page_flags & TTM_TT_FLAG_EXTERNAL);
 132
 133         if (slave)
 134                 return;
 135
 136         return ttm_pool_free(&bdev->pool, ttm);
 137 }
 138
 139 static void lsdc_bo_evict_flags(struct ttm_buffer_object *tbo,
 140                                 struct ttm_placement *tplacement)
 141 {
 142         struct ttm_resource *resource = tbo->resource;
 143         struct lsdc_bo *lbo = to_lsdc_bo(tbo);
 144
 145         switch (resource->mem_type) {
 146         case TTM_PL_VRAM:
 147                 lsdc_bo_set_placement(lbo, LSDC_GEM_DOMAIN_GTT);
 148                 break;
 149         case TTM_PL_TT:
 150         default:
 151                 lsdc_bo_set_placement(lbo, LSDC_GEM_DOMAIN_SYSTEM);
 152                 break;
 153         }
 154
 155         *tplacement = lbo->placement;
 156 }
 157
 158 static int lsdc_bo_move(struct ttm_buffer_object *tbo,
 159                         bool evict,
 160                         struct ttm_operation_ctx *ctx,
 161                         struct ttm_resource *new_mem,
 162                         struct ttm_place *hop)
 163 {
 164         struct drm_device *ddev = tbo->base.dev;
 165         struct ttm_resource *old_mem = tbo->resource;
 166         struct lsdc_bo *lbo = to_lsdc_bo(tbo);
 167         int ret;
 168
 169         if (unlikely(tbo->pin_count > 0)) {
 170                 drm_warn(ddev, "Can't move a pinned BO\n");
 171                 return -EINVAL;
 172         }
 173
 174         ret = ttm_bo_wait_ctx(tbo, ctx);
 175         if (ret)
 176                 return ret;
 177
 178         if (!old_mem) {
 179                 drm_dbg(ddev, "bo[%p] move: NULL to %s, size: %zu\n",
 180                         lbo, lsdc_mem_type_to_str(new_mem->mem_type),
 181                         lsdc_bo_size(lbo));
 182                 ttm_bo_move_null(tbo, new_mem);
 183                 return 0;
 184         }
 185
 186         if (old_mem->mem_type == TTM_PL_SYSTEM && !tbo->ttm) {
 187                 ttm_bo_move_null(tbo, new_mem);
 188                 drm_dbg(ddev, "bo[%p] move: SYSTEM to NULL, size: %zu\n",
 189                         lbo, lsdc_bo_size(lbo));
 190                 return 0;
 191         }
 192
 193         if (old_mem->mem_type == TTM_PL_SYSTEM &&
 194             new_mem->mem_type == TTM_PL_TT) {
 195                 drm_dbg(ddev, "bo[%p] move: SYSTEM to GTT, size: %zu\n",
 196                         lbo, lsdc_bo_size(lbo));
 197                 ttm_bo_move_null(tbo, new_mem);
 198                 return 0;
 199         }
 200
 201         if (old_mem->mem_type == TTM_PL_TT &&
 202             new_mem->mem_type == TTM_PL_SYSTEM) {
 203                 drm_dbg(ddev, "bo[%p] move: GTT to SYSTEM, size: %zu\n",
 204                         lbo, lsdc_bo_size(lbo));
 205                 ttm_resource_free(tbo, &tbo->resource);
 206                 ttm_bo_assign_mem(tbo, new_mem);
 207                 return 0;
 208         }
 209
 210         drm_dbg(ddev, "bo[%p] move: %s to %s, size: %zu\n",
 211                 lbo,
 212                 lsdc_mem_type_to_str(old_mem->mem_type),
 213                 lsdc_mem_type_to_str(new_mem->mem_type),
 214                 lsdc_bo_size(lbo));
 215
 216         return ttm_bo_move_memcpy(tbo, ctx, new_mem);
 217 }
 218
 219 static int lsdc_bo_reserve_io_mem(struct ttm_device *bdev,
 220                                   struct ttm_resource *mem)
 221 {
 222         struct lsdc_device *ldev = tdev_to_ldev(bdev);
 223
 224         switch (mem->mem_type) {
 225         case TTM_PL_SYSTEM:
 226                 break;
 227         case TTM_PL_TT:
 228                 break;
 229         case TTM_PL_VRAM:
 230                 mem->bus.offset = (mem->start << PAGE_SHIFT) + ldev->vram_base;
 231                 mem->bus.is_iomem = true;
 232                 mem->bus.caching = ttm_write_combined;
 233                 break;
 234         default:
 235                 return -EINVAL;
 236         }
 237
 238         return 0;
 239 }
 240
 241 static struct ttm_device_funcs lsdc_bo_driver = {
 242         .ttm_tt_create = lsdc_ttm_tt_create,
 243         .ttm_tt_populate = lsdc_ttm_tt_populate,
 244         .ttm_tt_unpopulate = lsdc_ttm_tt_unpopulate,
 245         .ttm_tt_destroy = lsdc_ttm_tt_destroy,
 246         .eviction_valuable = ttm_bo_eviction_valuable,
 247         .evict_flags = lsdc_bo_evict_flags,
 248         .move = lsdc_bo_move,
 249         .io_mem_reserve = lsdc_bo_reserve_io_mem,
 250 };
 251
 252 u64 lsdc_bo_gpu_offset(struct lsdc_bo *lbo)
 253 {
 254         struct ttm_buffer_object *tbo = &lbo->tbo;
 255         struct drm_device *ddev = tbo->base.dev;
 256         struct ttm_resource *resource = tbo->resource;
 257
 258         if (unlikely(!tbo->pin_count)) {
 259                 drm_err(ddev, "unpinned bo, gpu virtual address is invalid\n");
 260                 return 0;
 261         }
 262
 263         if (unlikely(resource->mem_type == TTM_PL_SYSTEM))
 264                 return 0;
 265
 266         return resource->start << PAGE_SHIFT;
 267 }
 268
 269 size_t lsdc_bo_size(struct lsdc_bo *lbo)
 270 {
 271         struct ttm_buffer_object *tbo = &lbo->tbo;
 272
 273         return tbo->base.size;
 274 }
 275
 276 int lsdc_bo_reserve(struct lsdc_bo *lbo)
 277 {
 278         return ttm_bo_reserve(&lbo->tbo, true, false, NULL);
 279 }
 280
 281 void lsdc_bo_unreserve(struct lsdc_bo *lbo)
 282 {
 283         return ttm_bo_unreserve(&lbo->tbo);
 284 }
 285
 286 int lsdc_bo_pin(struct lsdc_bo *lbo, u32 domain, u64 *gpu_addr)
 287 {
 288         struct ttm_operation_ctx ctx = { false, false };
 289         struct ttm_buffer_object *tbo = &lbo->tbo;
 290         struct lsdc_device *ldev = tdev_to_ldev(tbo->bdev);
 291         int ret;
 292
 293         if (tbo->pin_count)
 294                 goto bo_pinned;
 295
 296         if (lbo->sharing_count && domain == LSDC_GEM_DOMAIN_VRAM)
 297                 return -EINVAL;
 298
 299         if (domain)
 300                 lsdc_bo_set_placement(lbo, domain);
 301
 302         ret = ttm_bo_validate(tbo, &lbo->placement, &ctx);
 303         if (unlikely(ret)) {
 304                 drm_err(&ldev->base, "%p validate failed: %d\n", lbo, ret);
 305                 return ret;
 306         }
 307
 308         if (domain == LSDC_GEM_DOMAIN_VRAM)
 309                 ldev->vram_pinned_size += lsdc_bo_size(lbo);
 310         else if (domain == LSDC_GEM_DOMAIN_GTT)
 311                 ldev->gtt_pinned_size += lsdc_bo_size(lbo);
 312
 313 bo_pinned:
 314         ttm_bo_pin(tbo);
 315
 316         if (gpu_addr)
 317                 *gpu_addr = lsdc_bo_gpu_offset(lbo);
 318
 319         return 0;
 320 }
 321
 322 void lsdc_bo_unpin(struct lsdc_bo *lbo)
 323 {
 324         struct ttm_buffer_object *tbo = &lbo->tbo;
 325         struct lsdc_device *ldev = tdev_to_ldev(tbo->bdev);
 326
 327         if (unlikely(!tbo->pin_count)) {
 328                 drm_dbg(&ldev->base, "%p unpin is not necessary\n", lbo);
 329                 return;
 330         }
 331
 332         ttm_bo_unpin(tbo);
 333
 334         if (!tbo->pin_count) {
 335                 if (tbo->resource->mem_type == TTM_PL_VRAM)
 336                         ldev->vram_pinned_size -= lsdc_bo_size(lbo);
 337                 else if (tbo->resource->mem_type == TTM_PL_TT)
 338                         ldev->gtt_pinned_size -= lsdc_bo_size(lbo);
 339         }
 340 }
 341
 342 void lsdc_bo_ref(struct lsdc_bo *lbo)
 343 {
 344         drm_gem_object_get(&lbo->tbo.base);
 345 }
 346
 347 void lsdc_bo_unref(struct lsdc_bo *lbo)
 348 {
 349         drm_gem_object_put(&lbo->tbo.base);
 350 }
 351
 352 int lsdc_bo_kmap(struct lsdc_bo *lbo)
 353 {
 354         struct ttm_buffer_object *tbo = &lbo->tbo;
 355         struct drm_gem_object *gem = &tbo->base;
 356         struct drm_device *ddev = gem->dev;
 357         long ret;
 358         int err;
 359
 360         ret = dma_resv_wait_timeout(gem->resv, DMA_RESV_USAGE_KERNEL, false,
 361                                     MAX_SCHEDULE_TIMEOUT);
 362         if (ret < 0) {
 363                 drm_warn(ddev, "wait fence timeout\n");
 364                 return ret;
 365         }
 366
 367         if (lbo->kptr)
 368                 return 0;
 369
 370         err = ttm_bo_kmap(tbo, 0, PFN_UP(lsdc_bo_size(lbo)), &lbo->kmap);
 371         if (err) {
 372                 drm_err(ddev, "kmap %p failed: %d\n", lbo, err);
 373                 return err;
 374         }
 375
 376         lbo->kptr = ttm_kmap_obj_virtual(&lbo->kmap, &lbo->is_iomem);
 377
 378         return 0;
 379 }
 380
 381 void lsdc_bo_kunmap(struct lsdc_bo *lbo)
 382 {
 383         if (!lbo->kptr)
 384                 return;
 385
 386         lbo->kptr = NULL;
 387         ttm_bo_kunmap(&lbo->kmap);
 388 }
 389
 390 void lsdc_bo_clear(struct lsdc_bo *lbo)
 391 {
 392         lsdc_bo_kmap(lbo);
 393
 394         if (lbo->is_iomem)
 395                 memset_io((void __iomem *)lbo->kptr, 0, lbo->size);
 396         else
 397                 memset(lbo->kptr, 0, lbo->size);
 398
 399         lsdc_bo_kunmap(lbo);
 400 }
 401
 402 int lsdc_bo_evict_vram(struct drm_device *ddev)
 403 {
 404         struct lsdc_device *ldev = to_lsdc(ddev);
 405         struct ttm_device *bdev = &ldev->bdev;
 406         struct ttm_resource_manager *man;
 407
 408         man = ttm_manager_type(bdev, TTM_PL_VRAM);
 409         if (unlikely(!man))
 410                 return 0;
 411
 412         return ttm_resource_manager_evict_all(bdev, man);
 413 }
 414
 415 static void lsdc_bo_destroy(struct ttm_buffer_object *tbo)
 416 {
 417         struct lsdc_device *ldev = tdev_to_ldev(tbo->bdev);
 418         struct lsdc_bo *lbo = to_lsdc_bo(tbo);
 419
 420         mutex_lock(&ldev->gem.mutex);
 421         list_del_init(&lbo->list);
 422         mutex_unlock(&ldev->gem.mutex);
 423
 424         drm_gem_object_release(&tbo->base);
 425
 426         kfree(lbo);
 427 }
 428
 429 struct lsdc_bo *lsdc_bo_create(struct drm_device *ddev,
 430                                u32 domain,
 431                                size_t size,
 432                                bool kernel,
 433                                struct sg_table *sg,
 434                                struct dma_resv *resv)
 435 {
 436         struct lsdc_device *ldev = to_lsdc(ddev);
 437         struct ttm_device *bdev = &ldev->bdev;
 438         struct ttm_buffer_object *tbo;
 439         struct lsdc_bo *lbo;
 440         enum ttm_bo_type bo_type;
 441         int ret;
 442
 443         lbo = kzalloc(sizeof(*lbo), GFP_KERNEL);
 444         if (!lbo)
 445                 return ERR_PTR(-ENOMEM);
 446
 447         INIT_LIST_HEAD(&lbo->list);
 448
 449         lbo->initial_domain = domain & (LSDC_GEM_DOMAIN_VRAM |
 450                                         LSDC_GEM_DOMAIN_GTT |
 451                                         LSDC_GEM_DOMAIN_SYSTEM);
 452
 453         tbo = &lbo->tbo;
 454
 455         size = ALIGN(size, PAGE_SIZE);
 456
 457         ret = drm_gem_object_init(ddev, &tbo->base, size);
 458         if (ret) {
 459                 kfree(lbo);
 460                 return ERR_PTR(ret);
 461         }
 462
 463         tbo->bdev = bdev;
 464
 465         if (kernel)
 466                 bo_type = ttm_bo_type_kernel;
 467         else if (sg)
 468                 bo_type = ttm_bo_type_sg;
 469         else
 470                 bo_type = ttm_bo_type_device;
 471
 472         lsdc_bo_set_placement(lbo, domain);
 473         lbo->size = size;
 474
 475         ret = ttm_bo_init_validate(bdev, tbo, bo_type, &lbo->placement, 0,
 476                                    false, sg, resv, lsdc_bo_destroy);
 477         if (ret) {
 478                 kfree(lbo);
 479                 return ERR_PTR(ret);
 480         }
 481
 482         return lbo;
 483 }
 484
 485 struct lsdc_bo *lsdc_bo_create_kernel_pinned(struct drm_device *ddev,
 486                                              u32 domain,
 487                                              size_t size)
 488 {
 489         struct lsdc_bo *lbo;
 490         int ret;
 491
 492         lbo = lsdc_bo_create(ddev, domain, size, true, NULL, NULL);
 493         if (IS_ERR(lbo))
 494                 return ERR_CAST(lbo);
 495
 496         ret = lsdc_bo_reserve(lbo);
 497         if (unlikely(ret)) {
 498                 lsdc_bo_unref(lbo);
 499                 return ERR_PTR(ret);
 500         }
 501
 502         ret = lsdc_bo_pin(lbo, domain, NULL);
 503         lsdc_bo_unreserve(lbo);
 504         if (unlikely(ret)) {
 505                 lsdc_bo_unref(lbo);
 506                 return ERR_PTR(ret);
 507         }
 508
 509         return lbo;
 510 }
 511
 512 void lsdc_bo_free_kernel_pinned(struct lsdc_bo *lbo)
 513 {
 514         int ret;
 515
 516         ret = lsdc_bo_reserve(lbo);
 517         if (unlikely(ret))
 518                 return;
 519
 520         lsdc_bo_unpin(lbo);
 521         lsdc_bo_unreserve(lbo);
 522
 523         lsdc_bo_unref(lbo);
 524 }
 525
 526 static void lsdc_ttm_fini(struct drm_device *ddev, void *data)
 527 {
 528         struct lsdc_device *ldev = (struct lsdc_device *)data;
 529
 530         ttm_range_man_fini(&ldev->bdev, TTM_PL_VRAM);
 531         ttm_range_man_fini(&ldev->bdev, TTM_PL_TT);
 532
 533         ttm_device_fini(&ldev->bdev);
 534
 535         drm_dbg(ddev, "ttm finished\n");
 536 }
 537
 538 int lsdc_ttm_init(struct lsdc_device *ldev)
 539 {
 540         struct drm_device *ddev = &ldev->base;
 541         unsigned long num_vram_pages;
 542         unsigned long num_gtt_pages;
 543         int ret;
 544
 545         ret = ttm_device_init(&ldev->bdev, &lsdc_bo_driver, ddev->dev,
 546                               ddev->anon_inode->i_mapping,
 547                               ddev->vma_offset_manager, false, true);
 548         if (ret)
 549                 return ret;
 550
 551         num_vram_pages = ldev->vram_size >> PAGE_SHIFT;
 552
 553         ret = ttm_range_man_init(&ldev->bdev, TTM_PL_VRAM, false, num_vram_pages);
 554         if (unlikely(ret))
 555                 return ret;
 556
 557         drm_info(ddev, "VRAM: %lu pages ready\n", num_vram_pages);
 558
 559         /* 512M is far enough for us now */
 560         ldev->gtt_size = 512 << 20;
 561
 562         num_gtt_pages = ldev->gtt_size >> PAGE_SHIFT;
 563
 564         ret = ttm_range_man_init(&ldev->bdev, TTM_PL_TT, true, num_gtt_pages);
 565         if (unlikely(ret))
 566                 return ret;
 567
 568         drm_info(ddev, "GTT: %lu pages ready\n", num_gtt_pages);
 569
 570         return drmm_add_action_or_reset(ddev, lsdc_ttm_fini, ldev);
 571 }
 572
 573 void lsdc_ttm_debugfs_init(struct lsdc_device *ldev)
 574 {
 575         struct ttm_device *bdev = &ldev->bdev;
 576         struct drm_device *ddev = &ldev->base;
 577         struct drm_minor *minor = ddev->primary;
 578         struct dentry *root = minor->debugfs_root;
 579         struct ttm_resource_manager *vram_man;
 580         struct ttm_resource_manager *gtt_man;
 581
 582         vram_man = ttm_manager_type(bdev, TTM_PL_VRAM);
 583         gtt_man = ttm_manager_type(bdev, TTM_PL_TT);
 584
 585         ttm_resource_manager_create_debugfs(vram_man, root, "vram_mm");
 586         ttm_resource_manager_create_debugfs(gtt_man, root, "gtt_mm");
 587 }