drivers/gpu/drm/bochs/bochs_mm.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License as published by
   4  * the Free Software Foundation; either version 2 of the License, or
   5  * (at your option) any later version.
   6  */
   7
   8 #include "bochs.h"
   9
  10 static void bochs_ttm_placement(struct bochs_bo *bo, int domain);
  11
  12 /* ---------------------------------------------------------------------- */
  13
  14 static inline struct bochs_device *bochs_bdev(struct ttm_bo_device *bd)
  15 {
  16         return container_of(bd, struct bochs_device, ttm.bdev);
  17 }
  18
  19 static int bochs_ttm_mem_global_init(struct drm_global_reference *ref)
  20 {
  21         return ttm_mem_global_init(ref->object);
  22 }
  23
  24 static void bochs_ttm_mem_global_release(struct drm_global_reference *ref)
  25 {
  26         ttm_mem_global_release(ref->object);
  27 }
  28
  29 static int bochs_ttm_global_init(struct bochs_device *bochs)
  30 {
  31         struct drm_global_reference *global_ref;
  32         int r;
  33
  34         global_ref = &bochs->ttm.mem_global_ref;
  35         global_ref->global_type = DRM_GLOBAL_TTM_MEM;
  36         global_ref->size = sizeof(struct ttm_mem_global);
  37         global_ref->init = &bochs_ttm_mem_global_init;
  38         global_ref->release = &bochs_ttm_mem_global_release;
  39         r = drm_global_item_ref(global_ref);
  40         if (r != 0) {
  41                 DRM_ERROR("Failed setting up TTM memory accounting "
  42                           "subsystem.\n");
  43                 return r;
  44         }
  45
  46         bochs->ttm.bo_global_ref.mem_glob =
  47                 bochs->ttm.mem_global_ref.object;
  48         global_ref = &bochs->ttm.bo_global_ref.ref;
  49         global_ref->global_type = DRM_GLOBAL_TTM_BO;
  50         global_ref->size = sizeof(struct ttm_bo_global);
  51         global_ref->init = &ttm_bo_global_init;
  52         global_ref->release = &ttm_bo_global_release;
  53         r = drm_global_item_ref(global_ref);
  54         if (r != 0) {
  55                 DRM_ERROR("Failed setting up TTM BO subsystem.\n");
  56                 drm_global_item_unref(&bochs->ttm.mem_global_ref);
  57                 return r;
  58         }
  59
  60         return 0;
  61 }
  62
  63 static void bochs_ttm_global_release(struct bochs_device *bochs)
  64 {
  65         if (bochs->ttm.mem_global_ref.release == NULL)
  66                 return;
  67
  68         drm_global_item_unref(&bochs->ttm.bo_global_ref.ref);
  69         drm_global_item_unref(&bochs->ttm.mem_global_ref);
  70         bochs->ttm.mem_global_ref.release = NULL;
  71 }
  72
  73
  74 static void bochs_bo_ttm_destroy(struct ttm_buffer_object *tbo)
  75 {
  76         struct bochs_bo *bo;
  77
  78         bo = container_of(tbo, struct bochs_bo, bo);
  79         drm_gem_object_release(&bo->gem);
  80         kfree(bo);
  81 }
  82
  83 static bool bochs_ttm_bo_is_bochs_bo(struct ttm_buffer_object *bo)
  84 {
  85         if (bo->destroy == &bochs_bo_ttm_destroy)
  86                 return true;
  87         return false;
  88 }
  89
  90 static int bochs_bo_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
  91                                   struct ttm_mem_type_manager *man)
  92 {
  93         switch (type) {
  94         case TTM_PL_SYSTEM:
  95                 man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
  96                 man->available_caching = TTM_PL_MASK_CACHING;
  97                 man->default_caching = TTM_PL_FLAG_CACHED;
  98                 break;
  99         case TTM_PL_VRAM:
 100                 man->func = &ttm_bo_manager_func;
 101                 man->flags = TTM_MEMTYPE_FLAG_FIXED |
 102                         TTM_MEMTYPE_FLAG_MAPPABLE;
 103                 man->available_caching = TTM_PL_FLAG_UNCACHED |
 104                         TTM_PL_FLAG_WC;
 105                 man->default_caching = TTM_PL_FLAG_WC;
 106                 break;
 107         default:
 108                 DRM_ERROR("Unsupported memory type %u\n", (unsigned)type);
 109                 return -EINVAL;
 110         }
 111         return 0;
 112 }
 113
 114 static void
 115 bochs_bo_evict_flags(struct ttm_buffer_object *bo, struct ttm_placement *pl)
 116 {
 117         struct bochs_bo *bochsbo = bochs_bo(bo);
 118
 119         if (!bochs_ttm_bo_is_bochs_bo(bo))
 120                 return;
 121
 122         bochs_ttm_placement(bochsbo, TTM_PL_FLAG_SYSTEM);
 123         *pl = bochsbo->placement;
 124 }
 125
 126 static int bochs_bo_verify_access(struct ttm_buffer_object *bo,
 127                                   struct file *filp)
 128 {
 129         struct bochs_bo *bochsbo = bochs_bo(bo);
 130
 131         return drm_vma_node_verify_access(&bochsbo->gem.vma_node,
 132                                           filp->private_data);
 133 }
 134
 135 static int bochs_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
 136                                     struct ttm_mem_reg *mem)
 137 {
 138         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
 139         struct bochs_device *bochs = bochs_bdev(bdev);
 140
 141         mem->bus.addr = NULL;
 142         mem->bus.offset = 0;
 143         mem->bus.size = mem->num_pages << PAGE_SHIFT;
 144         mem->bus.base = 0;
 145         mem->bus.is_iomem = false;
 146         if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
 147                 return -EINVAL;
 148         switch (mem->mem_type) {
 149         case TTM_PL_SYSTEM:
 150                 /* system memory */
 151                 return 0;
 152         case TTM_PL_VRAM:
 153                 mem->bus.offset = mem->start << PAGE_SHIFT;
 154                 mem->bus.base = bochs->fb_base;
 155                 mem->bus.is_iomem = true;
 156                 break;
 157         default:
 158                 return -EINVAL;
 159                 break;
 160         }
 161         return 0;
 162 }
 163
 164 static void bochs_ttm_io_mem_free(struct ttm_bo_device *bdev,
 165                                   struct ttm_mem_reg *mem)
 166 {
 167 }
 168
 169 static void bochs_ttm_backend_destroy(struct ttm_tt *tt)
 170 {
 171         ttm_tt_fini(tt);
 172         kfree(tt);
 173 }
 174
 175 static struct ttm_backend_func bochs_tt_backend_func = {
 176         .destroy = &bochs_ttm_backend_destroy,
 177 };
 178
 179 static struct ttm_tt *bochs_ttm_tt_create(struct ttm_buffer_object *bo,
 180                                           uint32_t page_flags)
 181 {
 182         struct ttm_tt *tt;
 183
 184         tt = kzalloc(sizeof(struct ttm_tt), GFP_KERNEL);
 185         if (tt == NULL)
 186                 return NULL;
 187         tt->func = &bochs_tt_backend_func;
 188         if (ttm_tt_init(tt, bo, page_flags)) {
 189                 kfree(tt);
 190                 return NULL;
 191         }
 192         return tt;
 193 }
 194
 195 static struct ttm_bo_driver bochs_bo_driver = {
 196         .ttm_tt_create = bochs_ttm_tt_create,
 197         .init_mem_type = bochs_bo_init_mem_type,
 198         .eviction_valuable = ttm_bo_eviction_valuable,
 199         .evict_flags = bochs_bo_evict_flags,
 200         .move = NULL,
 201         .verify_access = bochs_bo_verify_access,
 202         .io_mem_reserve = &bochs_ttm_io_mem_reserve,
 203         .io_mem_free = &bochs_ttm_io_mem_free,
 204 };
 205
 206 int bochs_mm_init(struct bochs_device *bochs)
 207 {
 208         struct ttm_bo_device *bdev = &bochs->ttm.bdev;
 209         int ret;
 210
 211         ret = bochs_ttm_global_init(bochs);
 212         if (ret)
 213                 return ret;
 214
 215         ret = ttm_bo_device_init(&bochs->ttm.bdev,
 216                                  bochs->ttm.bo_global_ref.ref.object,
 217                                  &bochs_bo_driver,
 218                                  bochs->dev->anon_inode->i_mapping,
 219                                  DRM_FILE_PAGE_OFFSET,
 220                                  true);
 221         if (ret) {
 222                 DRM_ERROR("Error initialising bo driver; %d\n", ret);
 223                 return ret;
 224         }
 225
 226         ret = ttm_bo_init_mm(bdev, TTM_PL_VRAM,
 227                              bochs->fb_size >> PAGE_SHIFT);
 228         if (ret) {
 229                 DRM_ERROR("Failed ttm VRAM init: %d\n", ret);
 230                 return ret;
 231         }
 232
 233         bochs->ttm.initialized = true;
 234         return 0;
 235 }
 236
 237 void bochs_mm_fini(struct bochs_device *bochs)
 238 {
 239         if (!bochs->ttm.initialized)
 240                 return;
 241
 242         ttm_bo_device_release(&bochs->ttm.bdev);
 243         bochs_ttm_global_release(bochs);
 244         bochs->ttm.initialized = false;
 245 }
 246
 247 static void bochs_ttm_placement(struct bochs_bo *bo, int domain)
 248 {
 249         unsigned i;
 250         u32 c = 0;
 251         bo->placement.placement = bo->placements;
 252         bo->placement.busy_placement = bo->placements;
 253         if (domain & TTM_PL_FLAG_VRAM) {
 254                 bo->placements[c++].flags = TTM_PL_FLAG_WC
 255                         | TTM_PL_FLAG_UNCACHED
 256                         | TTM_PL_FLAG_VRAM;
 257         }
 258         if (domain & TTM_PL_FLAG_SYSTEM) {
 259                 bo->placements[c++].flags = TTM_PL_MASK_CACHING
 260                         | TTM_PL_FLAG_SYSTEM;
 261         }
 262         if (!c) {
 263                 bo->placements[c++].flags = TTM_PL_MASK_CACHING
 264                         | TTM_PL_FLAG_SYSTEM;
 265         }
 266         for (i = 0; i < c; ++i) {
 267                 bo->placements[i].fpfn = 0;
 268                 bo->placements[i].lpfn = 0;
 269         }
 270         bo->placement.num_placement = c;
 271         bo->placement.num_busy_placement = c;
 272 }
 273
 274 static inline u64 bochs_bo_gpu_offset(struct bochs_bo *bo)
 275 {
 276         return bo->bo.offset;
 277 }
 278
 279 int bochs_bo_pin(struct bochs_bo *bo, u32 pl_flag, u64 *gpu_addr)
 280 {
 281         struct ttm_operation_ctx ctx = { false, false };
 282         int i, ret;
 283
 284         if (bo->pin_count) {
 285                 bo->pin_count++;
 286                 if (gpu_addr)
 287                         *gpu_addr = bochs_bo_gpu_offset(bo);
 288                 return 0;
 289         }
 290
 291         bochs_ttm_placement(bo, pl_flag);
 292         for (i = 0; i < bo->placement.num_placement; i++)
 293                 bo->placements[i].flags |= TTM_PL_FLAG_NO_EVICT;
 294         ret = ttm_bo_validate(&bo->bo, &bo->placement, &ctx);
 295         if (ret)
 296                 return ret;
 297
 298         bo->pin_count = 1;
 299         if (gpu_addr)
 300                 *gpu_addr = bochs_bo_gpu_offset(bo);
 301         return 0;
 302 }
 303
 304 int bochs_bo_unpin(struct bochs_bo *bo)
 305 {
 306         struct ttm_operation_ctx ctx = { false, false };
 307         int i, ret;
 308
 309         if (!bo->pin_count) {
 310                 DRM_ERROR("unpin bad %p\n", bo);
 311                 return 0;
 312         }
 313         bo->pin_count--;
 314
 315         if (bo->pin_count)
 316                 return 0;
 317
 318         for (i = 0; i < bo->placement.num_placement; i++)
 319                 bo->placements[i].flags &= ~TTM_PL_FLAG_NO_EVICT;
 320         ret = ttm_bo_validate(&bo->bo, &bo->placement, &ctx);
 321         if (ret)
 322                 return ret;
 323
 324         return 0;
 325 }
 326
 327 int bochs_mmap(struct file *filp, struct vm_area_struct *vma)
 328 {
 329         struct drm_file *file_priv;
 330         struct bochs_device *bochs;
 331
 332         if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
 333                 return -EINVAL;
 334
 335         file_priv = filp->private_data;
 336         bochs = file_priv->minor->dev->dev_private;
 337         return ttm_bo_mmap(filp, vma, &bochs->ttm.bdev);
 338 }
 339
 340 /* ---------------------------------------------------------------------- */
 341
 342 static int bochs_bo_create(struct drm_device *dev, int size, int align,
 343                            uint32_t flags, struct bochs_bo **pbochsbo)
 344 {
 345         struct bochs_device *bochs = dev->dev_private;
 346         struct bochs_bo *bochsbo;
 347         size_t acc_size;
 348         int ret;
 349
 350         bochsbo = kzalloc(sizeof(struct bochs_bo), GFP_KERNEL);
 351         if (!bochsbo)
 352                 return -ENOMEM;
 353
 354         ret = drm_gem_object_init(dev, &bochsbo->gem, size);
 355         if (ret) {
 356                 kfree(bochsbo);
 357                 return ret;
 358         }
 359
 360         bochsbo->bo.bdev = &bochs->ttm.bdev;
 361         bochsbo->bo.bdev->dev_mapping = dev->anon_inode->i_mapping;
 362
 363         bochs_ttm_placement(bochsbo, TTM_PL_FLAG_VRAM | TTM_PL_FLAG_SYSTEM);
 364
 365         acc_size = ttm_bo_dma_acc_size(&bochs->ttm.bdev, size,
 366                                        sizeof(struct bochs_bo));
 367
 368         ret = ttm_bo_init(&bochs->ttm.bdev, &bochsbo->bo, size,
 369                           ttm_bo_type_device, &bochsbo->placement,
 370                           align >> PAGE_SHIFT, false, acc_size,
 371                           NULL, NULL, bochs_bo_ttm_destroy);
 372         if (ret)
 373                 return ret;
 374
 375         *pbochsbo = bochsbo;
 376         return 0;
 377 }
 378
 379 int bochs_gem_create(struct drm_device *dev, u32 size, bool iskernel,
 380                      struct drm_gem_object **obj)
 381 {
 382         struct bochs_bo *bochsbo;
 383         int ret;
 384
 385         *obj = NULL;
 386
 387         size = PAGE_ALIGN(size);
 388         if (size == 0)
 389                 return -EINVAL;
 390
 391         ret = bochs_bo_create(dev, size, 0, 0, &bochsbo);
 392         if (ret) {
 393                 if (ret != -ERESTARTSYS)
 394                         DRM_ERROR("failed to allocate GEM object\n");
 395                 return ret;
 396         }
 397         *obj = &bochsbo->gem;
 398         return 0;
 399 }
 400
 401 int bochs_dumb_create(struct drm_file *file, struct drm_device *dev,
 402                       struct drm_mode_create_dumb *args)
 403 {
 404         struct drm_gem_object *gobj;
 405         u32 handle;
 406         int ret;
 407
 408         args->pitch = args->width * ((args->bpp + 7) / 8);
 409         args->size = args->pitch * args->height;
 410
 411         ret = bochs_gem_create(dev, args->size, false,
 412                                &gobj);
 413         if (ret)
 414                 return ret;
 415
 416         ret = drm_gem_handle_create(file, gobj, &handle);
 417         drm_gem_object_unreference_unlocked(gobj);
 418         if (ret)
 419                 return ret;
 420
 421         args->handle = handle;
 422         return 0;
 423 }
 424
 425 static void bochs_bo_unref(struct bochs_bo **bo)
 426 {
 427         struct ttm_buffer_object *tbo;
 428
 429         if ((*bo) == NULL)
 430                 return;
 431
 432         tbo = &((*bo)->bo);
 433         ttm_bo_unref(&tbo);
 434         *bo = NULL;
 435 }
 436
 437 void bochs_gem_free_object(struct drm_gem_object *obj)
 438 {
 439         struct bochs_bo *bochs_bo = gem_to_bochs_bo(obj);
 440
 441         bochs_bo_unref(&bochs_bo);
 442 }
 443
 444 int bochs_dumb_mmap_offset(struct drm_file *file, struct drm_device *dev,
 445                            uint32_t handle, uint64_t *offset)
 446 {
 447         struct drm_gem_object *obj;
 448         struct bochs_bo *bo;
 449
 450         obj = drm_gem_object_lookup(file, handle);
 451         if (obj == NULL)
 452                 return -ENOENT;
 453
 454         bo = gem_to_bochs_bo(obj);
 455         *offset = bochs_bo_mmap_offset(bo);
 456
 457         drm_gem_object_unreference_unlocked(obj);
 458         return 0;
 459 }
 460
 461 /* ---------------------------------------------------------------------- */
 462
 463 static void bochs_user_framebuffer_destroy(struct drm_framebuffer *fb)
 464 {
 465         struct bochs_framebuffer *bochs_fb = to_bochs_framebuffer(fb);
 466
 467         drm_gem_object_unreference_unlocked(bochs_fb->obj);
 468         drm_framebuffer_cleanup(fb);
 469         kfree(fb);
 470 }
 471
 472 static const struct drm_framebuffer_funcs bochs_fb_funcs = {
 473         .destroy = bochs_user_framebuffer_destroy,
 474 };
 475
 476 int bochs_framebuffer_init(struct drm_device *dev,
 477                            struct bochs_framebuffer *gfb,
 478                            const struct drm_mode_fb_cmd2 *mode_cmd,
 479                            struct drm_gem_object *obj)
 480 {
 481         int ret;
 482
 483         drm_helper_mode_fill_fb_struct(dev, &gfb->base, mode_cmd);
 484         gfb->obj = obj;
 485         ret = drm_framebuffer_init(dev, &gfb->base, &bochs_fb_funcs);
 486         if (ret) {
 487                 DRM_ERROR("drm_framebuffer_init failed: %d\n", ret);
 488                 return ret;
 489         }
 490         return 0;
 491 }
 492
 493 static struct drm_framebuffer *
 494 bochs_user_framebuffer_create(struct drm_device *dev,
 495                               struct drm_file *filp,
 496                               const struct drm_mode_fb_cmd2 *mode_cmd)
 497 {
 498         struct drm_gem_object *obj;
 499         struct bochs_framebuffer *bochs_fb;
 500         int ret;
 501
 502         DRM_DEBUG_DRIVER("%dx%d, format %c%c%c%c\n",
 503                mode_cmd->width, mode_cmd->height,
 504                (mode_cmd->pixel_format)       & 0xff,
 505                (mode_cmd->pixel_format >> 8)  & 0xff,
 506                (mode_cmd->pixel_format >> 16) & 0xff,
 507                (mode_cmd->pixel_format >> 24) & 0xff);
 508
 509         if (mode_cmd->pixel_format != DRM_FORMAT_XRGB8888)
 510                 return ERR_PTR(-ENOENT);
 511
 512         obj = drm_gem_object_lookup(filp, mode_cmd->handles[0]);
 513         if (obj == NULL)
 514                 return ERR_PTR(-ENOENT);
 515
 516         bochs_fb = kzalloc(sizeof(*bochs_fb), GFP_KERNEL);
 517         if (!bochs_fb) {
 518                 drm_gem_object_unreference_unlocked(obj);
 519                 return ERR_PTR(-ENOMEM);
 520         }
 521
 522         ret = bochs_framebuffer_init(dev, bochs_fb, mode_cmd, obj);
 523         if (ret) {
 524                 drm_gem_object_unreference_unlocked(obj);
 525                 kfree(bochs_fb);
 526                 return ERR_PTR(ret);
 527         }
 528         return &bochs_fb->base;
 529 }
 530
 531 const struct drm_mode_config_funcs bochs_mode_funcs = {
 532         .fb_create = bochs_user_framebuffer_create,
 533 };