drivers/gpu/drm/ast/ast_ttm.c

   1 /*
   2  * Copyright 2012 Red Hat 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
   6  * "Software"), to deal in the Software without restriction, including
   7  * without limitation the rights to use, copy, modify, merge, publish,
   8  * distribute, sub license, and/or sell copies of the Software, and to
   9  * permit persons to whom the Software is furnished to do so, subject to
  10  * the following conditions:
  11  *
  12  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  13  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  14  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  15  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  16  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  17  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  18  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  19  *
  20  * The above copyright notice and this permission notice (including the
  21  * next paragraph) shall be included in all copies or substantial portions
  22  * of the Software.
  23  *
  24  */
  25 /*
  26  * Authors: Dave Airlie <airlied@redhat.com>
  27  */
  28 #include <drm/drmP.h>
  29 #include "ast_drv.h"
  30 #include <ttm/ttm_page_alloc.h>
  31
  32 static inline struct ast_private *
  33 ast_bdev(struct ttm_bo_device *bd)
  34 {
  35         return container_of(bd, struct ast_private, ttm.bdev);
  36 }
  37
  38 static int
  39 ast_ttm_mem_global_init(struct drm_global_reference *ref)
  40 {
  41         return ttm_mem_global_init(ref->object);
  42 }
  43
  44 static void
  45 ast_ttm_mem_global_release(struct drm_global_reference *ref)
  46 {
  47         ttm_mem_global_release(ref->object);
  48 }
  49
  50 static int ast_ttm_global_init(struct ast_private *ast)
  51 {
  52         struct drm_global_reference *global_ref;
  53         int r;
  54
  55         global_ref = &ast->ttm.mem_global_ref;
  56         global_ref->global_type = DRM_GLOBAL_TTM_MEM;
  57         global_ref->size = sizeof(struct ttm_mem_global);
  58         global_ref->init = &ast_ttm_mem_global_init;
  59         global_ref->release = &ast_ttm_mem_global_release;
  60         r = drm_global_item_ref(global_ref);
  61         if (r != 0) {
  62                 DRM_ERROR("Failed setting up TTM memory accounting "
  63                           "subsystem.\n");
  64                 return r;
  65         }
  66
  67         ast->ttm.bo_global_ref.mem_glob =
  68                 ast->ttm.mem_global_ref.object;
  69         global_ref = &ast->ttm.bo_global_ref.ref;
  70         global_ref->global_type = DRM_GLOBAL_TTM_BO;
  71         global_ref->size = sizeof(struct ttm_bo_global);
  72         global_ref->init = &ttm_bo_global_init;
  73         global_ref->release = &ttm_bo_global_release;
  74         r = drm_global_item_ref(global_ref);
  75         if (r != 0) {
  76                 DRM_ERROR("Failed setting up TTM BO subsystem.\n");
  77                 drm_global_item_unref(&ast->ttm.mem_global_ref);
  78                 return r;
  79         }
  80         return 0;
  81 }
  82
  83 static void
  84 ast_ttm_global_release(struct ast_private *ast)
  85 {
  86         if (ast->ttm.mem_global_ref.release == NULL)
  87                 return;
  88
  89         drm_global_item_unref(&ast->ttm.bo_global_ref.ref);
  90         drm_global_item_unref(&ast->ttm.mem_global_ref);
  91         ast->ttm.mem_global_ref.release = NULL;
  92 }
  93
  94
  95 static void ast_bo_ttm_destroy(struct ttm_buffer_object *tbo)
  96 {
  97         struct ast_bo *bo;
  98
  99         bo = container_of(tbo, struct ast_bo, bo);
 100
 101         drm_gem_object_release(&bo->gem);
 102         kfree(bo);
 103 }
 104
 105 static bool ast_ttm_bo_is_ast_bo(struct ttm_buffer_object *bo)
 106 {
 107         if (bo->destroy == &ast_bo_ttm_destroy)
 108                 return true;
 109         return false;
 110 }
 111
 112 static int
 113 ast_bo_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
 114                      struct ttm_mem_type_manager *man)
 115 {
 116         switch (type) {
 117         case TTM_PL_SYSTEM:
 118                 man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
 119                 man->available_caching = TTM_PL_MASK_CACHING;
 120                 man->default_caching = TTM_PL_FLAG_CACHED;
 121                 break;
 122         case TTM_PL_VRAM:
 123                 man->func = &ttm_bo_manager_func;
 124                 man->flags = TTM_MEMTYPE_FLAG_FIXED |
 125                         TTM_MEMTYPE_FLAG_MAPPABLE;
 126                 man->available_caching = TTM_PL_FLAG_UNCACHED |
 127                         TTM_PL_FLAG_WC;
 128                 man->default_caching = TTM_PL_FLAG_WC;
 129                 break;
 130         default:
 131                 DRM_ERROR("Unsupported memory type %u\n", (unsigned)type);
 132                 return -EINVAL;
 133         }
 134         return 0;
 135 }
 136
 137 static void
 138 ast_bo_evict_flags(struct ttm_buffer_object *bo, struct ttm_placement *pl)
 139 {
 140         struct ast_bo *astbo = ast_bo(bo);
 141
 142         if (!ast_ttm_bo_is_ast_bo(bo))
 143                 return;
 144
 145         ast_ttm_placement(astbo, TTM_PL_FLAG_SYSTEM);
 146         *pl = astbo->placement;
 147 }
 148
 149 static int ast_bo_verify_access(struct ttm_buffer_object *bo, struct file *filp)
 150 {
 151         struct ast_bo *astbo = ast_bo(bo);
 152
 153         return drm_vma_node_verify_access(&astbo->gem.vma_node,
 154                                           filp->private_data);
 155 }
 156
 157 static int ast_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
 158                                   struct ttm_mem_reg *mem)
 159 {
 160         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
 161         struct ast_private *ast = ast_bdev(bdev);
 162
 163         mem->bus.addr = NULL;
 164         mem->bus.offset = 0;
 165         mem->bus.size = mem->num_pages << PAGE_SHIFT;
 166         mem->bus.base = 0;
 167         mem->bus.is_iomem = false;
 168         if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
 169                 return -EINVAL;
 170         switch (mem->mem_type) {
 171         case TTM_PL_SYSTEM:
 172                 /* system memory */
 173                 return 0;
 174         case TTM_PL_VRAM:
 175                 mem->bus.offset = mem->start << PAGE_SHIFT;
 176                 mem->bus.base = pci_resource_start(ast->dev->pdev, 0);
 177                 mem->bus.is_iomem = true;
 178                 break;
 179         default:
 180                 return -EINVAL;
 181                 break;
 182         }
 183         return 0;
 184 }
 185
 186 static void ast_ttm_io_mem_free(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
 187 {
 188 }
 189
 190 static void ast_ttm_backend_destroy(struct ttm_tt *tt)
 191 {
 192         ttm_tt_fini(tt);
 193         kfree(tt);
 194 }
 195
 196 static struct ttm_backend_func ast_tt_backend_func = {
 197         .destroy = &ast_ttm_backend_destroy,
 198 };
 199
 200
 201 static struct ttm_tt *ast_ttm_tt_create(struct ttm_bo_device *bdev,
 202                                  unsigned long size, uint32_t page_flags,
 203                                  struct page *dummy_read_page)
 204 {
 205         struct ttm_tt *tt;
 206
 207         tt = kzalloc(sizeof(struct ttm_tt), GFP_KERNEL);
 208         if (tt == NULL)
 209                 return NULL;
 210         tt->func = &ast_tt_backend_func;
 211         if (ttm_tt_init(tt, bdev, size, page_flags, dummy_read_page)) {
 212                 kfree(tt);
 213                 return NULL;
 214         }
 215         return tt;
 216 }
 217
 218 static int ast_ttm_tt_populate(struct ttm_tt *ttm)
 219 {
 220         return ttm_pool_populate(ttm);
 221 }
 222
 223 static void ast_ttm_tt_unpopulate(struct ttm_tt *ttm)
 224 {
 225         ttm_pool_unpopulate(ttm);
 226 }
 227
 228 struct ttm_bo_driver ast_bo_driver = {
 229         .ttm_tt_create = ast_ttm_tt_create,
 230         .ttm_tt_populate = ast_ttm_tt_populate,
 231         .ttm_tt_unpopulate = ast_ttm_tt_unpopulate,
 232         .init_mem_type = ast_bo_init_mem_type,
 233         .evict_flags = ast_bo_evict_flags,
 234         .move = NULL,
 235         .verify_access = ast_bo_verify_access,
 236         .io_mem_reserve = &ast_ttm_io_mem_reserve,
 237         .io_mem_free = &ast_ttm_io_mem_free,
 238         .lru_tail = &ttm_bo_default_lru_tail,
 239         .swap_lru_tail = &ttm_bo_default_swap_lru_tail,
 240 };
 241
 242 int ast_mm_init(struct ast_private *ast)
 243 {
 244         int ret;
 245         struct drm_device *dev = ast->dev;
 246         struct ttm_bo_device *bdev = &ast->ttm.bdev;
 247
 248         ret = ast_ttm_global_init(ast);
 249         if (ret)
 250                 return ret;
 251
 252         ret = ttm_bo_device_init(&ast->ttm.bdev,
 253                                  ast->ttm.bo_global_ref.ref.object,
 254                                  &ast_bo_driver,
 255                                  dev->anon_inode->i_mapping,
 256                                  DRM_FILE_PAGE_OFFSET,
 257                                  true);
 258         if (ret) {
 259                 DRM_ERROR("Error initialising bo driver; %d\n", ret);
 260                 return ret;
 261         }
 262
 263         ret = ttm_bo_init_mm(bdev, TTM_PL_VRAM,
 264                              ast->vram_size >> PAGE_SHIFT);
 265         if (ret) {
 266                 DRM_ERROR("Failed ttm VRAM init: %d\n", ret);
 267                 return ret;
 268         }
 269
 270         ast->fb_mtrr = arch_phys_wc_add(pci_resource_start(dev->pdev, 0),
 271                                         pci_resource_len(dev->pdev, 0));
 272
 273         return 0;
 274 }
 275
 276 void ast_mm_fini(struct ast_private *ast)
 277 {
 278         ttm_bo_device_release(&ast->ttm.bdev);
 279
 280         ast_ttm_global_release(ast);
 281
 282         arch_phys_wc_del(ast->fb_mtrr);
 283 }
 284
 285 void ast_ttm_placement(struct ast_bo *bo, int domain)
 286 {
 287         u32 c = 0;
 288         unsigned i;
 289
 290         bo->placement.placement = bo->placements;
 291         bo->placement.busy_placement = bo->placements;
 292         if (domain & TTM_PL_FLAG_VRAM)
 293                 bo->placements[c++].flags = TTM_PL_FLAG_WC | TTM_PL_FLAG_UNCACHED | TTM_PL_FLAG_VRAM;
 294         if (domain & TTM_PL_FLAG_SYSTEM)
 295                 bo->placements[c++].flags = TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM;
 296         if (!c)
 297                 bo->placements[c++].flags = TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM;
 298         bo->placement.num_placement = c;
 299         bo->placement.num_busy_placement = c;
 300         for (i = 0; i < c; ++i) {
 301                 bo->placements[i].fpfn = 0;
 302                 bo->placements[i].lpfn = 0;
 303         }
 304 }
 305
 306 int ast_bo_create(struct drm_device *dev, int size, int align,
 307                   uint32_t flags, struct ast_bo **pastbo)
 308 {
 309         struct ast_private *ast = dev->dev_private;
 310         struct ast_bo *astbo;
 311         size_t acc_size;
 312         int ret;
 313
 314         astbo = kzalloc(sizeof(struct ast_bo), GFP_KERNEL);
 315         if (!astbo)
 316                 return -ENOMEM;
 317
 318         ret = drm_gem_object_init(dev, &astbo->gem, size);
 319         if (ret) {
 320                 kfree(astbo);
 321                 return ret;
 322         }
 323
 324         astbo->bo.bdev = &ast->ttm.bdev;
 325
 326         ast_ttm_placement(astbo, TTM_PL_FLAG_VRAM | TTM_PL_FLAG_SYSTEM);
 327
 328         acc_size = ttm_bo_dma_acc_size(&ast->ttm.bdev, size,
 329                                        sizeof(struct ast_bo));
 330
 331         ret = ttm_bo_init(&ast->ttm.bdev, &astbo->bo, size,
 332                           ttm_bo_type_device, &astbo->placement,
 333                           align >> PAGE_SHIFT, false, NULL, acc_size,
 334                           NULL, NULL, ast_bo_ttm_destroy);
 335         if (ret)
 336                 return ret;
 337
 338         *pastbo = astbo;
 339         return 0;
 340 }
 341
 342 static inline u64 ast_bo_gpu_offset(struct ast_bo *bo)
 343 {
 344         return bo->bo.offset;
 345 }
 346
 347 int ast_bo_pin(struct ast_bo *bo, u32 pl_flag, u64 *gpu_addr)
 348 {
 349         int i, ret;
 350
 351         if (bo->pin_count) {
 352                 bo->pin_count++;
 353                 if (gpu_addr)
 354                         *gpu_addr = ast_bo_gpu_offset(bo);
 355         }
 356
 357         ast_ttm_placement(bo, pl_flag);
 358         for (i = 0; i < bo->placement.num_placement; i++)
 359                 bo->placements[i].flags |= TTM_PL_FLAG_NO_EVICT;
 360         ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false);
 361         if (ret)
 362                 return ret;
 363
 364         bo->pin_count = 1;
 365         if (gpu_addr)
 366                 *gpu_addr = ast_bo_gpu_offset(bo);
 367         return 0;
 368 }
 369
 370 int ast_bo_unpin(struct ast_bo *bo)
 371 {
 372         int i, ret;
 373         if (!bo->pin_count) {
 374                 DRM_ERROR("unpin bad %p\n", bo);
 375                 return 0;
 376         }
 377         bo->pin_count--;
 378         if (bo->pin_count)
 379                 return 0;
 380
 381         for (i = 0; i < bo->placement.num_placement ; i++)
 382                 bo->placements[i].flags &= ~TTM_PL_FLAG_NO_EVICT;
 383         ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false);
 384         if (ret)
 385                 return ret;
 386
 387         return 0;
 388 }
 389
 390 int ast_bo_push_sysram(struct ast_bo *bo)
 391 {
 392         int i, ret;
 393         if (!bo->pin_count) {
 394                 DRM_ERROR("unpin bad %p\n", bo);
 395                 return 0;
 396         }
 397         bo->pin_count--;
 398         if (bo->pin_count)
 399                 return 0;
 400
 401         if (bo->kmap.virtual)
 402                 ttm_bo_kunmap(&bo->kmap);
 403
 404         ast_ttm_placement(bo, TTM_PL_FLAG_SYSTEM);
 405         for (i = 0; i < bo->placement.num_placement ; i++)
 406                 bo->placements[i].flags |= TTM_PL_FLAG_NO_EVICT;
 407
 408         ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false);
 409         if (ret) {
 410                 DRM_ERROR("pushing to VRAM failed\n");
 411                 return ret;
 412         }
 413         return 0;
 414 }
 415
 416 int ast_mmap(struct file *filp, struct vm_area_struct *vma)
 417 {
 418         struct drm_file *file_priv;
 419         struct ast_private *ast;
 420
 421         if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
 422                 return -EINVAL;
 423
 424         file_priv = filp->private_data;
 425         ast = file_priv->minor->dev->dev_private;
 426         return ttm_bo_mmap(filp, vma, &ast->ttm.bdev);
 427 }