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 void bochs_bo_ttm_destroy(struct ttm_buffer_object *tbo)
  20 {
  21         struct bochs_bo *bo;
  22
  23         bo = container_of(tbo, struct bochs_bo, bo);
  24         drm_gem_object_release(&bo->gem);
  25         kfree(bo);
  26 }
  27
  28 static bool bochs_ttm_bo_is_bochs_bo(struct ttm_buffer_object *bo)
  29 {
  30         if (bo->destroy == &bochs_bo_ttm_destroy)
  31                 return true;
  32         return false;
  33 }
  34
  35 static int bochs_bo_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
  36                                   struct ttm_mem_type_manager *man)
  37 {
  38         switch (type) {
  39         case TTM_PL_SYSTEM:
  40                 man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
  41                 man->available_caching = TTM_PL_MASK_CACHING;
  42                 man->default_caching = TTM_PL_FLAG_CACHED;
  43                 break;
  44         case TTM_PL_VRAM:
  45                 man->func = &ttm_bo_manager_func;
  46                 man->flags = TTM_MEMTYPE_FLAG_FIXED |
  47                         TTM_MEMTYPE_FLAG_MAPPABLE;
  48                 man->available_caching = TTM_PL_FLAG_UNCACHED |
  49                         TTM_PL_FLAG_WC;
  50                 man->default_caching = TTM_PL_FLAG_WC;
  51                 break;
  52         default:
  53                 DRM_ERROR("Unsupported memory type %u\n", (unsigned)type);
  54                 return -EINVAL;
  55         }
  56         return 0;
  57 }
  58
  59 static void
  60 bochs_bo_evict_flags(struct ttm_buffer_object *bo, struct ttm_placement *pl)
  61 {
  62         struct bochs_bo *bochsbo = bochs_bo(bo);
  63
  64         if (!bochs_ttm_bo_is_bochs_bo(bo))
  65                 return;
  66
  67         bochs_ttm_placement(bochsbo, TTM_PL_FLAG_SYSTEM);
  68         *pl = bochsbo->placement;
  69 }
  70
  71 static int bochs_bo_verify_access(struct ttm_buffer_object *bo,
  72                                   struct file *filp)
  73 {
  74         struct bochs_bo *bochsbo = bochs_bo(bo);
  75
  76         return drm_vma_node_verify_access(&bochsbo->gem.vma_node,
  77                                           filp->private_data);
  78 }
  79
  80 static int bochs_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
  81                                     struct ttm_mem_reg *mem)
  82 {
  83         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
  84         struct bochs_device *bochs = bochs_bdev(bdev);
  85
  86         mem->bus.addr = NULL;
  87         mem->bus.offset = 0;
  88         mem->bus.size = mem->num_pages << PAGE_SHIFT;
  89         mem->bus.base = 0;
  90         mem->bus.is_iomem = false;
  91         if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
  92                 return -EINVAL;
  93         switch (mem->mem_type) {
  94         case TTM_PL_SYSTEM:
  95                 /* system memory */
  96                 return 0;
  97         case TTM_PL_VRAM:
  98                 mem->bus.offset = mem->start << PAGE_SHIFT;
  99                 mem->bus.base = bochs->fb_base;
 100                 mem->bus.is_iomem = true;
 101                 break;
 102         default:
 103                 return -EINVAL;
 104                 break;
 105         }
 106         return 0;
 107 }
 108
 109 static void bochs_ttm_io_mem_free(struct ttm_bo_device *bdev,
 110                                   struct ttm_mem_reg *mem)
 111 {
 112 }
 113
 114 static void bochs_ttm_backend_destroy(struct ttm_tt *tt)
 115 {
 116         ttm_tt_fini(tt);
 117         kfree(tt);
 118 }
 119
 120 static struct ttm_backend_func bochs_tt_backend_func = {
 121         .destroy = &bochs_ttm_backend_destroy,
 122 };
 123
 124 static struct ttm_tt *bochs_ttm_tt_create(struct ttm_buffer_object *bo,
 125                                           uint32_t page_flags)
 126 {
 127         struct ttm_tt *tt;
 128
 129         tt = kzalloc(sizeof(struct ttm_tt), GFP_KERNEL);
 130         if (tt == NULL)
 131                 return NULL;
 132         tt->func = &bochs_tt_backend_func;
 133         if (ttm_tt_init(tt, bo, page_flags)) {
 134                 kfree(tt);
 135                 return NULL;
 136         }
 137         return tt;
 138 }
 139
 140 static struct ttm_bo_driver bochs_bo_driver = {
 141         .ttm_tt_create = bochs_ttm_tt_create,
 142         .init_mem_type = bochs_bo_init_mem_type,
 143         .eviction_valuable = ttm_bo_eviction_valuable,
 144         .evict_flags = bochs_bo_evict_flags,
 145         .move = NULL,
 146         .verify_access = bochs_bo_verify_access,
 147         .io_mem_reserve = &bochs_ttm_io_mem_reserve,
 148         .io_mem_free = &bochs_ttm_io_mem_free,
 149 };
 150
 151 int bochs_mm_init(struct bochs_device *bochs)
 152 {
 153         struct ttm_bo_device *bdev = &bochs->ttm.bdev;
 154         int ret;
 155
 156         ret = ttm_bo_device_init(&bochs->ttm.bdev,
 157                                  &bochs_bo_driver,
 158                                  bochs->dev->anon_inode->i_mapping,
 159                                  true);
 160         if (ret) {
 161                 DRM_ERROR("Error initialising bo driver; %d\n", ret);
 162                 return ret;
 163         }
 164
 165         ret = ttm_bo_init_mm(bdev, TTM_PL_VRAM,
 166                              bochs->fb_size >> PAGE_SHIFT);
 167         if (ret) {
 168                 DRM_ERROR("Failed ttm VRAM init: %d\n", ret);
 169                 return ret;
 170         }
 171
 172         bochs->ttm.initialized = true;
 173         return 0;
 174 }
 175
 176 void bochs_mm_fini(struct bochs_device *bochs)
 177 {
 178         if (!bochs->ttm.initialized)
 179                 return;
 180
 181         ttm_bo_device_release(&bochs->ttm.bdev);
 182         bochs->ttm.initialized = false;
 183 }
 184
 185 static void bochs_ttm_placement(struct bochs_bo *bo, int domain)
 186 {
 187         unsigned i;
 188         u32 c = 0;
 189         bo->placement.placement = bo->placements;
 190         bo->placement.busy_placement = bo->placements;
 191         if (domain & TTM_PL_FLAG_VRAM) {
 192                 bo->placements[c++].flags = TTM_PL_FLAG_WC
 193                         | TTM_PL_FLAG_UNCACHED
 194                         | TTM_PL_FLAG_VRAM;
 195         }
 196         if (domain & TTM_PL_FLAG_SYSTEM) {
 197                 bo->placements[c++].flags = TTM_PL_MASK_CACHING
 198                         | TTM_PL_FLAG_SYSTEM;
 199         }
 200         if (!c) {
 201                 bo->placements[c++].flags = TTM_PL_MASK_CACHING
 202                         | TTM_PL_FLAG_SYSTEM;
 203         }
 204         for (i = 0; i < c; ++i) {
 205                 bo->placements[i].fpfn = 0;
 206                 bo->placements[i].lpfn = 0;
 207         }
 208         bo->placement.num_placement = c;
 209         bo->placement.num_busy_placement = c;
 210 }
 211
 212 int bochs_bo_pin(struct bochs_bo *bo, u32 pl_flag)
 213 {
 214         struct ttm_operation_ctx ctx = { false, false };
 215         int i, ret;
 216
 217         if (bo->pin_count) {
 218                 bo->pin_count++;
 219                 return 0;
 220         }
 221
 222         bochs_ttm_placement(bo, pl_flag);
 223         for (i = 0; i < bo->placement.num_placement; i++)
 224                 bo->placements[i].flags |= TTM_PL_FLAG_NO_EVICT;
 225         ret = ttm_bo_reserve(&bo->bo, true, false, NULL);
 226         if (ret)
 227                 return ret;
 228         ret = ttm_bo_validate(&bo->bo, &bo->placement, &ctx);
 229         ttm_bo_unreserve(&bo->bo);
 230         if (ret)
 231                 return ret;
 232
 233         bo->pin_count = 1;
 234         return 0;
 235 }
 236
 237 int bochs_bo_unpin(struct bochs_bo *bo)
 238 {
 239         struct ttm_operation_ctx ctx = { false, false };
 240         int i, ret;
 241
 242         if (!bo->pin_count) {
 243                 DRM_ERROR("unpin bad %p\n", bo);
 244                 return 0;
 245         }
 246         bo->pin_count--;
 247
 248         if (bo->pin_count)
 249                 return 0;
 250
 251         for (i = 0; i < bo->placement.num_placement; i++)
 252                 bo->placements[i].flags &= ~TTM_PL_FLAG_NO_EVICT;
 253         ret = ttm_bo_reserve(&bo->bo, true, false, NULL);
 254         if (ret)
 255                 return ret;
 256         ret = ttm_bo_validate(&bo->bo, &bo->placement, &ctx);
 257         ttm_bo_unreserve(&bo->bo);
 258         if (ret)
 259                 return ret;
 260
 261         return 0;
 262 }
 263
 264 int bochs_mmap(struct file *filp, struct vm_area_struct *vma)
 265 {
 266         struct drm_file *file_priv = filp->private_data;
 267         struct bochs_device *bochs = file_priv->minor->dev->dev_private;
 268
 269         return ttm_bo_mmap(filp, vma, &bochs->ttm.bdev);
 270 }
 271
 272 /* ---------------------------------------------------------------------- */
 273
 274 static int bochs_bo_create(struct drm_device *dev, int size, int align,
 275                            uint32_t flags, struct bochs_bo **pbochsbo)
 276 {
 277         struct bochs_device *bochs = dev->dev_private;
 278         struct bochs_bo *bochsbo;
 279         size_t acc_size;
 280         int ret;
 281
 282         bochsbo = kzalloc(sizeof(struct bochs_bo), GFP_KERNEL);
 283         if (!bochsbo)
 284                 return -ENOMEM;
 285
 286         ret = drm_gem_object_init(dev, &bochsbo->gem, size);
 287         if (ret) {
 288                 kfree(bochsbo);
 289                 return ret;
 290         }
 291
 292         bochsbo->bo.bdev = &bochs->ttm.bdev;
 293         bochsbo->bo.bdev->dev_mapping = dev->anon_inode->i_mapping;
 294
 295         bochs_ttm_placement(bochsbo, TTM_PL_FLAG_VRAM | TTM_PL_FLAG_SYSTEM);
 296
 297         acc_size = ttm_bo_dma_acc_size(&bochs->ttm.bdev, size,
 298                                        sizeof(struct bochs_bo));
 299
 300         ret = ttm_bo_init(&bochs->ttm.bdev, &bochsbo->bo, size,
 301                           ttm_bo_type_device, &bochsbo->placement,
 302                           align >> PAGE_SHIFT, false, acc_size,
 303                           NULL, NULL, bochs_bo_ttm_destroy);
 304         if (ret)
 305                 return ret;
 306
 307         *pbochsbo = bochsbo;
 308         return 0;
 309 }
 310
 311 int bochs_gem_create(struct drm_device *dev, u32 size, bool iskernel,
 312                      struct drm_gem_object **obj)
 313 {
 314         struct bochs_bo *bochsbo;
 315         int ret;
 316
 317         *obj = NULL;
 318
 319         size = PAGE_ALIGN(size);
 320         if (size == 0)
 321                 return -EINVAL;
 322
 323         ret = bochs_bo_create(dev, size, 0, 0, &bochsbo);
 324         if (ret) {
 325                 if (ret != -ERESTARTSYS)
 326                         DRM_ERROR("failed to allocate GEM object\n");
 327                 return ret;
 328         }
 329         *obj = &bochsbo->gem;
 330         return 0;
 331 }
 332
 333 int bochs_dumb_create(struct drm_file *file, struct drm_device *dev,
 334                       struct drm_mode_create_dumb *args)
 335 {
 336         struct drm_gem_object *gobj;
 337         u32 handle;
 338         int ret;
 339
 340         args->pitch = args->width * ((args->bpp + 7) / 8);
 341         args->size = args->pitch * args->height;
 342
 343         ret = bochs_gem_create(dev, args->size, false,
 344                                &gobj);
 345         if (ret)
 346                 return ret;
 347
 348         ret = drm_gem_handle_create(file, gobj, &handle);
 349         drm_gem_object_put_unlocked(gobj);
 350         if (ret)
 351                 return ret;
 352
 353         args->handle = handle;
 354         return 0;
 355 }
 356
 357 static void bochs_bo_unref(struct bochs_bo **bo)
 358 {
 359         struct ttm_buffer_object *tbo;
 360
 361         if ((*bo) == NULL)
 362                 return;
 363
 364         tbo = &((*bo)->bo);
 365         ttm_bo_put(tbo);
 366         *bo = NULL;
 367 }
 368
 369 void bochs_gem_free_object(struct drm_gem_object *obj)
 370 {
 371         struct bochs_bo *bochs_bo = gem_to_bochs_bo(obj);
 372
 373         bochs_bo_unref(&bochs_bo);
 374 }
 375
 376 int bochs_dumb_mmap_offset(struct drm_file *file, struct drm_device *dev,
 377                            uint32_t handle, uint64_t *offset)
 378 {
 379         struct drm_gem_object *obj;
 380         struct bochs_bo *bo;
 381
 382         obj = drm_gem_object_lookup(file, handle);
 383         if (obj == NULL)
 384                 return -ENOENT;
 385
 386         bo = gem_to_bochs_bo(obj);
 387         *offset = bochs_bo_mmap_offset(bo);
 388
 389         drm_gem_object_put_unlocked(obj);
 390         return 0;
 391 }
 392
 393 /* ---------------------------------------------------------------------- */
 394
 395 int bochs_gem_prime_pin(struct drm_gem_object *obj)
 396 {
 397         struct bochs_bo *bo = gem_to_bochs_bo(obj);
 398
 399         return bochs_bo_pin(bo, TTM_PL_FLAG_VRAM);
 400 }
 401
 402 void bochs_gem_prime_unpin(struct drm_gem_object *obj)
 403 {
 404         struct bochs_bo *bo = gem_to_bochs_bo(obj);
 405
 406         bochs_bo_unpin(bo);
 407 }
 408
 409 void *bochs_gem_prime_vmap(struct drm_gem_object *obj)
 410 {
 411         struct bochs_bo *bo = gem_to_bochs_bo(obj);
 412         bool is_iomem;
 413         int ret;
 414
 415         ret = bochs_bo_pin(bo, TTM_PL_FLAG_VRAM);
 416         if (ret)
 417                 return NULL;
 418         ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages, &bo->kmap);
 419         if (ret) {
 420                 bochs_bo_unpin(bo);
 421                 return NULL;
 422         }
 423         return ttm_kmap_obj_virtual(&bo->kmap, &is_iomem);
 424 }
 425
 426 void bochs_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
 427 {
 428         struct bochs_bo *bo = gem_to_bochs_bo(obj);
 429
 430         ttm_bo_kunmap(&bo->kmap);
 431         bochs_bo_unpin(bo);
 432 }
 433
 434 int bochs_gem_prime_mmap(struct drm_gem_object *obj,
 435                          struct vm_area_struct *vma)
 436 {
 437         struct bochs_bo *bo = gem_to_bochs_bo(obj);
 438
 439         bo->gem.vma_node.vm_node.start = bo->bo.vma_node.vm_node.start;
 440         return drm_gem_prime_mmap(obj, vma);
 441 }