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_bo_device *bdev,
 180                                           unsigned long size,
 181                                           uint32_t page_flags,
 182                                           struct page *dummy_read_page)
 183 {
 184         struct ttm_tt *tt;
 185
 186         tt = kzalloc(sizeof(struct ttm_tt), GFP_KERNEL);
 187         if (tt == NULL)
 188                 return NULL;
 189         tt->func = &bochs_tt_backend_func;
 190         if (ttm_tt_init(tt, bdev, size, page_flags, dummy_read_page)) {
 191                 kfree(tt);
 192                 return NULL;
 193         }
 194         return tt;
 195 }
 196
 197 struct ttm_bo_driver bochs_bo_driver = {
 198         .ttm_tt_create = bochs_ttm_tt_create,
 199         .ttm_tt_populate = ttm_pool_populate,
 200         .ttm_tt_unpopulate = ttm_pool_unpopulate,
 201         .init_mem_type = bochs_bo_init_mem_type,
 202         .eviction_valuable = ttm_bo_eviction_valuable,
 203         .evict_flags = bochs_bo_evict_flags,
 204         .move = NULL,
 205         .verify_access = bochs_bo_verify_access,
 206         .io_mem_reserve = &bochs_ttm_io_mem_reserve,
 207         .io_mem_free = &bochs_ttm_io_mem_free,
 208         .lru_tail = &ttm_bo_default_lru_tail,
 209         .swap_lru_tail = &ttm_bo_default_swap_lru_tail,
 210 };
 211
 212 int bochs_mm_init(struct bochs_device *bochs)
 213 {
 214         struct ttm_bo_device *bdev = &bochs->ttm.bdev;
 215         int ret;
 216
 217         ret = bochs_ttm_global_init(bochs);
 218         if (ret)
 219                 return ret;
 220
 221         ret = ttm_bo_device_init(&bochs->ttm.bdev,
 222                                  bochs->ttm.bo_global_ref.ref.object,
 223                                  &bochs_bo_driver,
 224                                  bochs->dev->anon_inode->i_mapping,
 225                                  DRM_FILE_PAGE_OFFSET,
 226                                  true);
 227         if (ret) {
 228                 DRM_ERROR("Error initialising bo driver; %d\n", ret);
 229                 return ret;
 230         }
 231
 232         ret = ttm_bo_init_mm(bdev, TTM_PL_VRAM,
 233                              bochs->fb_size >> PAGE_SHIFT);
 234         if (ret) {
 235                 DRM_ERROR("Failed ttm VRAM init: %d\n", ret);
 236                 return ret;
 237         }
 238
 239         bochs->ttm.initialized = true;
 240         return 0;
 241 }
 242
 243 void bochs_mm_fini(struct bochs_device *bochs)
 244 {
 245         if (!bochs->ttm.initialized)
 246                 return;
 247
 248         ttm_bo_device_release(&bochs->ttm.bdev);
 249         bochs_ttm_global_release(bochs);
 250         bochs->ttm.initialized = false;
 251 }
 252
 253 static void bochs_ttm_placement(struct bochs_bo *bo, int domain)
 254 {
 255         unsigned i;
 256         u32 c = 0;
 257         bo->placement.placement = bo->placements;
 258         bo->placement.busy_placement = bo->placements;
 259         if (domain & TTM_PL_FLAG_VRAM) {
 260                 bo->placements[c++].flags = TTM_PL_FLAG_WC
 261                         | TTM_PL_FLAG_UNCACHED
 262                         | TTM_PL_FLAG_VRAM;
 263         }
 264         if (domain & TTM_PL_FLAG_SYSTEM) {
 265                 bo->placements[c++].flags = TTM_PL_MASK_CACHING
 266                         | TTM_PL_FLAG_SYSTEM;
 267         }
 268         if (!c) {
 269                 bo->placements[c++].flags = TTM_PL_MASK_CACHING
 270                         | TTM_PL_FLAG_SYSTEM;
 271         }
 272         for (i = 0; i < c; ++i) {
 273                 bo->placements[i].fpfn = 0;
 274                 bo->placements[i].lpfn = 0;
 275         }
 276         bo->placement.num_placement = c;
 277         bo->placement.num_busy_placement = c;
 278 }
 279
 280 static inline u64 bochs_bo_gpu_offset(struct bochs_bo *bo)
 281 {
 282         return bo->bo.offset;
 283 }
 284
 285 int bochs_bo_pin(struct bochs_bo *bo, u32 pl_flag, u64 *gpu_addr)
 286 {
 287         int i, ret;
 288
 289         if (bo->pin_count) {
 290                 bo->pin_count++;
 291                 if (gpu_addr)
 292                         *gpu_addr = bochs_bo_gpu_offset(bo);
 293                 return 0;
 294         }
 295
 296         bochs_ttm_placement(bo, pl_flag);
 297         for (i = 0; i < bo->placement.num_placement; i++)
 298                 bo->placements[i].flags |= TTM_PL_FLAG_NO_EVICT;
 299         ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false);
 300         if (ret)
 301                 return ret;
 302
 303         bo->pin_count = 1;
 304         if (gpu_addr)
 305                 *gpu_addr = bochs_bo_gpu_offset(bo);
 306         return 0;
 307 }
 308
 309 int bochs_bo_unpin(struct bochs_bo *bo)
 310 {
 311         int i, ret;
 312
 313         if (!bo->pin_count) {
 314                 DRM_ERROR("unpin bad %p\n", bo);
 315                 return 0;
 316         }
 317         bo->pin_count--;
 318
 319         if (bo->pin_count)
 320                 return 0;
 321
 322         for (i = 0; i < bo->placement.num_placement; i++)
 323                 bo->placements[i].flags &= ~TTM_PL_FLAG_NO_EVICT;
 324         ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false);
 325         if (ret)
 326                 return ret;
 327
 328         return 0;
 329 }
 330
 331 int bochs_mmap(struct file *filp, struct vm_area_struct *vma)
 332 {
 333         struct drm_file *file_priv;
 334         struct bochs_device *bochs;
 335
 336         if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
 337                 return -EINVAL;
 338
 339         file_priv = filp->private_data;
 340         bochs = file_priv->minor->dev->dev_private;
 341         return ttm_bo_mmap(filp, vma, &bochs->ttm.bdev);
 342 }
 343
 344 /* ---------------------------------------------------------------------- */
 345
 346 static int bochs_bo_create(struct drm_device *dev, int size, int align,
 347                            uint32_t flags, struct bochs_bo **pbochsbo)
 348 {
 349         struct bochs_device *bochs = dev->dev_private;
 350         struct bochs_bo *bochsbo;
 351         size_t acc_size;
 352         int ret;
 353
 354         bochsbo = kzalloc(sizeof(struct bochs_bo), GFP_KERNEL);
 355         if (!bochsbo)
 356                 return -ENOMEM;
 357
 358         ret = drm_gem_object_init(dev, &bochsbo->gem, size);
 359         if (ret) {
 360                 kfree(bochsbo);
 361                 return ret;
 362         }
 363
 364         bochsbo->bo.bdev = &bochs->ttm.bdev;
 365         bochsbo->bo.bdev->dev_mapping = dev->anon_inode->i_mapping;
 366
 367         bochs_ttm_placement(bochsbo, TTM_PL_FLAG_VRAM | TTM_PL_FLAG_SYSTEM);
 368
 369         acc_size = ttm_bo_dma_acc_size(&bochs->ttm.bdev, size,
 370                                        sizeof(struct bochs_bo));
 371
 372         ret = ttm_bo_init(&bochs->ttm.bdev, &bochsbo->bo, size,
 373                           ttm_bo_type_device, &bochsbo->placement,
 374                           align >> PAGE_SHIFT, false, NULL, acc_size,
 375                           NULL, NULL, bochs_bo_ttm_destroy);
 376         if (ret)
 377                 return ret;
 378
 379         *pbochsbo = bochsbo;
 380         return 0;
 381 }
 382
 383 int bochs_gem_create(struct drm_device *dev, u32 size, bool iskernel,
 384                      struct drm_gem_object **obj)
 385 {
 386         struct bochs_bo *bochsbo;
 387         int ret;
 388
 389         *obj = NULL;
 390
 391         size = PAGE_ALIGN(size);
 392         if (size == 0)
 393                 return -EINVAL;
 394
 395         ret = bochs_bo_create(dev, size, 0, 0, &bochsbo);
 396         if (ret) {
 397                 if (ret != -ERESTARTSYS)
 398                         DRM_ERROR("failed to allocate GEM object\n");
 399                 return ret;
 400         }
 401         *obj = &bochsbo->gem;
 402         return 0;
 403 }
 404
 405 int bochs_dumb_create(struct drm_file *file, struct drm_device *dev,
 406                       struct drm_mode_create_dumb *args)
 407 {
 408         struct drm_gem_object *gobj;
 409         u32 handle;
 410         int ret;
 411
 412         args->pitch = args->width * ((args->bpp + 7) / 8);
 413         args->size = args->pitch * args->height;
 414
 415         ret = bochs_gem_create(dev, args->size, false,
 416                                &gobj);
 417         if (ret)
 418                 return ret;
 419
 420         ret = drm_gem_handle_create(file, gobj, &handle);
 421         drm_gem_object_unreference_unlocked(gobj);
 422         if (ret)
 423                 return ret;
 424
 425         args->handle = handle;
 426         return 0;
 427 }
 428
 429 static void bochs_bo_unref(struct bochs_bo **bo)
 430 {
 431         struct ttm_buffer_object *tbo;
 432
 433         if ((*bo) == NULL)
 434                 return;
 435
 436         tbo = &((*bo)->bo);
 437         ttm_bo_unref(&tbo);
 438         *bo = NULL;
 439 }
 440
 441 void bochs_gem_free_object(struct drm_gem_object *obj)
 442 {
 443         struct bochs_bo *bochs_bo = gem_to_bochs_bo(obj);
 444
 445         bochs_bo_unref(&bochs_bo);
 446 }
 447
 448 int bochs_dumb_mmap_offset(struct drm_file *file, struct drm_device *dev,
 449                            uint32_t handle, uint64_t *offset)
 450 {
 451         struct drm_gem_object *obj;
 452         struct bochs_bo *bo;
 453
 454         obj = drm_gem_object_lookup(file, handle);
 455         if (obj == NULL)
 456                 return -ENOENT;
 457
 458         bo = gem_to_bochs_bo(obj);
 459         *offset = bochs_bo_mmap_offset(bo);
 460
 461         drm_gem_object_unreference_unlocked(obj);
 462         return 0;
 463 }
 464
 465 /* ---------------------------------------------------------------------- */
 466
 467 static void bochs_user_framebuffer_destroy(struct drm_framebuffer *fb)
 468 {
 469         struct bochs_framebuffer *bochs_fb = to_bochs_framebuffer(fb);
 470
 471         drm_gem_object_unreference_unlocked(bochs_fb->obj);
 472         drm_framebuffer_cleanup(fb);
 473         kfree(fb);
 474 }
 475
 476 static const struct drm_framebuffer_funcs bochs_fb_funcs = {
 477         .destroy = bochs_user_framebuffer_destroy,
 478 };
 479
 480 int bochs_framebuffer_init(struct drm_device *dev,
 481                            struct bochs_framebuffer *gfb,
 482                            const struct drm_mode_fb_cmd2 *mode_cmd,
 483                            struct drm_gem_object *obj)
 484 {
 485         int ret;
 486
 487         drm_helper_mode_fill_fb_struct(dev, &gfb->base, mode_cmd);
 488         gfb->obj = obj;
 489         ret = drm_framebuffer_init(dev, &gfb->base, &bochs_fb_funcs);
 490         if (ret) {
 491                 DRM_ERROR("drm_framebuffer_init failed: %d\n", ret);
 492                 return ret;
 493         }
 494         return 0;
 495 }
 496
 497 static struct drm_framebuffer *
 498 bochs_user_framebuffer_create(struct drm_device *dev,
 499                               struct drm_file *filp,
 500                               const struct drm_mode_fb_cmd2 *mode_cmd)
 501 {
 502         struct drm_gem_object *obj;
 503         struct bochs_framebuffer *bochs_fb;
 504         int ret;
 505
 506         DRM_DEBUG_DRIVER("%dx%d, format %c%c%c%c\n",
 507                mode_cmd->width, mode_cmd->height,
 508                (mode_cmd->pixel_format)       & 0xff,
 509                (mode_cmd->pixel_format >> 8)  & 0xff,
 510                (mode_cmd->pixel_format >> 16) & 0xff,
 511                (mode_cmd->pixel_format >> 24) & 0xff);
 512
 513         if (mode_cmd->pixel_format != DRM_FORMAT_XRGB8888)
 514                 return ERR_PTR(-ENOENT);
 515
 516         obj = drm_gem_object_lookup(filp, mode_cmd->handles[0]);
 517         if (obj == NULL)
 518                 return ERR_PTR(-ENOENT);
 519
 520         bochs_fb = kzalloc(sizeof(*bochs_fb), GFP_KERNEL);
 521         if (!bochs_fb) {
 522                 drm_gem_object_unreference_unlocked(obj);
 523                 return ERR_PTR(-ENOMEM);
 524         }
 525
 526         ret = bochs_framebuffer_init(dev, bochs_fb, mode_cmd, obj);
 527         if (ret) {
 528                 drm_gem_object_unreference_unlocked(obj);
 529                 kfree(bochs_fb);
 530                 return ERR_PTR(ret);
 531         }
 532         return &bochs_fb->base;
 533 }
 534
 535 const struct drm_mode_config_funcs bochs_mode_funcs = {
 536         .fb_create = bochs_user_framebuffer_create,
 537 };