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                                  DRM_FILE_PAGE_OFFSET,
 160                                  true);
 161         if (ret) {
 162                 DRM_ERROR("Error initialising bo driver; %d\n", ret);
 163                 return ret;
 164         }
 165
 166         ret = ttm_bo_init_mm(bdev, TTM_PL_VRAM,
 167                              bochs->fb_size >> PAGE_SHIFT);
 168         if (ret) {
 169                 DRM_ERROR("Failed ttm VRAM init: %d\n", ret);
 170                 return ret;
 171         }
 172
 173         bochs->ttm.initialized = true;
 174         return 0;
 175 }
 176
 177 void bochs_mm_fini(struct bochs_device *bochs)
 178 {
 179         if (!bochs->ttm.initialized)
 180                 return;
 181
 182         ttm_bo_device_release(&bochs->ttm.bdev);
 183         bochs->ttm.initialized = false;
 184 }
 185
 186 static void bochs_ttm_placement(struct bochs_bo *bo, int domain)
 187 {
 188         unsigned i;
 189         u32 c = 0;
 190         bo->placement.placement = bo->placements;
 191         bo->placement.busy_placement = bo->placements;
 192         if (domain & TTM_PL_FLAG_VRAM) {
 193                 bo->placements[c++].flags = TTM_PL_FLAG_WC
 194                         | TTM_PL_FLAG_UNCACHED
 195                         | TTM_PL_FLAG_VRAM;
 196         }
 197         if (domain & TTM_PL_FLAG_SYSTEM) {
 198                 bo->placements[c++].flags = TTM_PL_MASK_CACHING
 199                         | TTM_PL_FLAG_SYSTEM;
 200         }
 201         if (!c) {
 202                 bo->placements[c++].flags = TTM_PL_MASK_CACHING
 203                         | TTM_PL_FLAG_SYSTEM;
 204         }
 205         for (i = 0; i < c; ++i) {
 206                 bo->placements[i].fpfn = 0;
 207                 bo->placements[i].lpfn = 0;
 208         }
 209         bo->placement.num_placement = c;
 210         bo->placement.num_busy_placement = c;
 211 }
 212
 213 static inline u64 bochs_bo_gpu_offset(struct bochs_bo *bo)
 214 {
 215         return bo->bo.offset;
 216 }
 217
 218 int bochs_bo_pin(struct bochs_bo *bo, u32 pl_flag, u64 *gpu_addr)
 219 {
 220         struct ttm_operation_ctx ctx = { false, false };
 221         int i, ret;
 222
 223         if (bo->pin_count) {
 224                 bo->pin_count++;
 225                 if (gpu_addr)
 226                         *gpu_addr = bochs_bo_gpu_offset(bo);
 227                 return 0;
 228         }
 229
 230         bochs_ttm_placement(bo, pl_flag);
 231         for (i = 0; i < bo->placement.num_placement; i++)
 232                 bo->placements[i].flags |= TTM_PL_FLAG_NO_EVICT;
 233         ret = ttm_bo_validate(&bo->bo, &bo->placement, &ctx);
 234         if (ret)
 235                 return ret;
 236
 237         bo->pin_count = 1;
 238         if (gpu_addr)
 239                 *gpu_addr = bochs_bo_gpu_offset(bo);
 240         return 0;
 241 }
 242
 243 int bochs_bo_unpin(struct bochs_bo *bo)
 244 {
 245         struct ttm_operation_ctx ctx = { false, false };
 246         int i, ret;
 247
 248         if (!bo->pin_count) {
 249                 DRM_ERROR("unpin bad %p\n", bo);
 250                 return 0;
 251         }
 252         bo->pin_count--;
 253
 254         if (bo->pin_count)
 255                 return 0;
 256
 257         for (i = 0; i < bo->placement.num_placement; i++)
 258                 bo->placements[i].flags &= ~TTM_PL_FLAG_NO_EVICT;
 259         ret = ttm_bo_validate(&bo->bo, &bo->placement, &ctx);
 260         if (ret)
 261                 return ret;
 262
 263         return 0;
 264 }
 265
 266 int bochs_mmap(struct file *filp, struct vm_area_struct *vma)
 267 {
 268         struct drm_file *file_priv;
 269         struct bochs_device *bochs;
 270
 271         if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
 272                 return -EINVAL;
 273
 274         file_priv = filp->private_data;
 275         bochs = file_priv->minor->dev->dev_private;
 276         return ttm_bo_mmap(filp, vma, &bochs->ttm.bdev);
 277 }
 278
 279 /* ---------------------------------------------------------------------- */
 280
 281 static int bochs_bo_create(struct drm_device *dev, int size, int align,
 282                            uint32_t flags, struct bochs_bo **pbochsbo)
 283 {
 284         struct bochs_device *bochs = dev->dev_private;
 285         struct bochs_bo *bochsbo;
 286         size_t acc_size;
 287         int ret;
 288
 289         bochsbo = kzalloc(sizeof(struct bochs_bo), GFP_KERNEL);
 290         if (!bochsbo)
 291                 return -ENOMEM;
 292
 293         ret = drm_gem_object_init(dev, &bochsbo->gem, size);
 294         if (ret) {
 295                 kfree(bochsbo);
 296                 return ret;
 297         }
 298
 299         bochsbo->bo.bdev = &bochs->ttm.bdev;
 300         bochsbo->bo.bdev->dev_mapping = dev->anon_inode->i_mapping;
 301
 302         bochs_ttm_placement(bochsbo, TTM_PL_FLAG_VRAM | TTM_PL_FLAG_SYSTEM);
 303
 304         acc_size = ttm_bo_dma_acc_size(&bochs->ttm.bdev, size,
 305                                        sizeof(struct bochs_bo));
 306
 307         ret = ttm_bo_init(&bochs->ttm.bdev, &bochsbo->bo, size,
 308                           ttm_bo_type_device, &bochsbo->placement,
 309                           align >> PAGE_SHIFT, false, acc_size,
 310                           NULL, NULL, bochs_bo_ttm_destroy);
 311         if (ret)
 312                 return ret;
 313
 314         *pbochsbo = bochsbo;
 315         return 0;
 316 }
 317
 318 int bochs_gem_create(struct drm_device *dev, u32 size, bool iskernel,
 319                      struct drm_gem_object **obj)
 320 {
 321         struct bochs_bo *bochsbo;
 322         int ret;
 323
 324         *obj = NULL;
 325
 326         size = PAGE_ALIGN(size);
 327         if (size == 0)
 328                 return -EINVAL;
 329
 330         ret = bochs_bo_create(dev, size, 0, 0, &bochsbo);
 331         if (ret) {
 332                 if (ret != -ERESTARTSYS)
 333                         DRM_ERROR("failed to allocate GEM object\n");
 334                 return ret;
 335         }
 336         *obj = &bochsbo->gem;
 337         return 0;
 338 }
 339
 340 int bochs_dumb_create(struct drm_file *file, struct drm_device *dev,
 341                       struct drm_mode_create_dumb *args)
 342 {
 343         struct drm_gem_object *gobj;
 344         u32 handle;
 345         int ret;
 346
 347         args->pitch = args->width * ((args->bpp + 7) / 8);
 348         args->size = args->pitch * args->height;
 349
 350         ret = bochs_gem_create(dev, args->size, false,
 351                                &gobj);
 352         if (ret)
 353                 return ret;
 354
 355         ret = drm_gem_handle_create(file, gobj, &handle);
 356         drm_gem_object_put_unlocked(gobj);
 357         if (ret)
 358                 return ret;
 359
 360         args->handle = handle;
 361         return 0;
 362 }
 363
 364 static void bochs_bo_unref(struct bochs_bo **bo)
 365 {
 366         struct ttm_buffer_object *tbo;
 367
 368         if ((*bo) == NULL)
 369                 return;
 370
 371         tbo = &((*bo)->bo);
 372         ttm_bo_put(tbo);
 373         *bo = NULL;
 374 }
 375
 376 void bochs_gem_free_object(struct drm_gem_object *obj)
 377 {
 378         struct bochs_bo *bochs_bo = gem_to_bochs_bo(obj);
 379
 380         bochs_bo_unref(&bochs_bo);
 381 }
 382
 383 int bochs_dumb_mmap_offset(struct drm_file *file, struct drm_device *dev,
 384                            uint32_t handle, uint64_t *offset)
 385 {
 386         struct drm_gem_object *obj;
 387         struct bochs_bo *bo;
 388
 389         obj = drm_gem_object_lookup(file, handle);
 390         if (obj == NULL)
 391                 return -ENOENT;
 392
 393         bo = gem_to_bochs_bo(obj);
 394         *offset = bochs_bo_mmap_offset(bo);
 395
 396         drm_gem_object_put_unlocked(obj);
 397         return 0;
 398 }