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_global_init(struct bochs_device *bochs)
  20 {
  21         struct drm_global_reference *global_ref;
  22         int r;
  23
  24         global_ref = &bochs->ttm.bo_global_ref.ref;
  25         global_ref->global_type = DRM_GLOBAL_TTM_BO;
  26         global_ref->size = sizeof(struct ttm_bo_global);
  27         global_ref->init = &ttm_bo_global_ref_init;
  28         global_ref->release = &ttm_bo_global_ref_release;
  29         r = drm_global_item_ref(global_ref);
  30         if (r != 0) {
  31                 DRM_ERROR("Failed setting up TTM BO subsystem.\n");
  32                 return r;
  33         }
  34
  35         return 0;
  36 }
  37
  38 static void bochs_ttm_global_release(struct bochs_device *bochs)
  39 {
  40         if (bochs->ttm.bo_global_ref.ref.release == NULL)
  41                 return;
  42
  43         drm_global_item_unref(&bochs->ttm.bo_global_ref.ref);
  44         bochs->ttm.bo_global_ref.ref.release = NULL;
  45 }
  46
  47
  48 static void bochs_bo_ttm_destroy(struct ttm_buffer_object *tbo)
  49 {
  50         struct bochs_bo *bo;
  51
  52         bo = container_of(tbo, struct bochs_bo, bo);
  53         drm_gem_object_release(&bo->gem);
  54         kfree(bo);
  55 }
  56
  57 static bool bochs_ttm_bo_is_bochs_bo(struct ttm_buffer_object *bo)
  58 {
  59         if (bo->destroy == &bochs_bo_ttm_destroy)
  60                 return true;
  61         return false;
  62 }
  63
  64 static int bochs_bo_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
  65                                   struct ttm_mem_type_manager *man)
  66 {
  67         switch (type) {
  68         case TTM_PL_SYSTEM:
  69                 man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
  70                 man->available_caching = TTM_PL_MASK_CACHING;
  71                 man->default_caching = TTM_PL_FLAG_CACHED;
  72                 break;
  73         case TTM_PL_VRAM:
  74                 man->func = &ttm_bo_manager_func;
  75                 man->flags = TTM_MEMTYPE_FLAG_FIXED |
  76                         TTM_MEMTYPE_FLAG_MAPPABLE;
  77                 man->available_caching = TTM_PL_FLAG_UNCACHED |
  78                         TTM_PL_FLAG_WC;
  79                 man->default_caching = TTM_PL_FLAG_WC;
  80                 break;
  81         default:
  82                 DRM_ERROR("Unsupported memory type %u\n", (unsigned)type);
  83                 return -EINVAL;
  84         }
  85         return 0;
  86 }
  87
  88 static void
  89 bochs_bo_evict_flags(struct ttm_buffer_object *bo, struct ttm_placement *pl)
  90 {
  91         struct bochs_bo *bochsbo = bochs_bo(bo);
  92
  93         if (!bochs_ttm_bo_is_bochs_bo(bo))
  94                 return;
  95
  96         bochs_ttm_placement(bochsbo, TTM_PL_FLAG_SYSTEM);
  97         *pl = bochsbo->placement;
  98 }
  99
 100 static int bochs_bo_verify_access(struct ttm_buffer_object *bo,
 101                                   struct file *filp)
 102 {
 103         struct bochs_bo *bochsbo = bochs_bo(bo);
 104
 105         return drm_vma_node_verify_access(&bochsbo->gem.vma_node,
 106                                           filp->private_data);
 107 }
 108
 109 static int bochs_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
 110                                     struct ttm_mem_reg *mem)
 111 {
 112         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
 113         struct bochs_device *bochs = bochs_bdev(bdev);
 114
 115         mem->bus.addr = NULL;
 116         mem->bus.offset = 0;
 117         mem->bus.size = mem->num_pages << PAGE_SHIFT;
 118         mem->bus.base = 0;
 119         mem->bus.is_iomem = false;
 120         if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
 121                 return -EINVAL;
 122         switch (mem->mem_type) {
 123         case TTM_PL_SYSTEM:
 124                 /* system memory */
 125                 return 0;
 126         case TTM_PL_VRAM:
 127                 mem->bus.offset = mem->start << PAGE_SHIFT;
 128                 mem->bus.base = bochs->fb_base;
 129                 mem->bus.is_iomem = true;
 130                 break;
 131         default:
 132                 return -EINVAL;
 133                 break;
 134         }
 135         return 0;
 136 }
 137
 138 static void bochs_ttm_io_mem_free(struct ttm_bo_device *bdev,
 139                                   struct ttm_mem_reg *mem)
 140 {
 141 }
 142
 143 static void bochs_ttm_backend_destroy(struct ttm_tt *tt)
 144 {
 145         ttm_tt_fini(tt);
 146         kfree(tt);
 147 }
 148
 149 static struct ttm_backend_func bochs_tt_backend_func = {
 150         .destroy = &bochs_ttm_backend_destroy,
 151 };
 152
 153 static struct ttm_tt *bochs_ttm_tt_create(struct ttm_buffer_object *bo,
 154                                           uint32_t page_flags)
 155 {
 156         struct ttm_tt *tt;
 157
 158         tt = kzalloc(sizeof(struct ttm_tt), GFP_KERNEL);
 159         if (tt == NULL)
 160                 return NULL;
 161         tt->func = &bochs_tt_backend_func;
 162         if (ttm_tt_init(tt, bo, page_flags)) {
 163                 kfree(tt);
 164                 return NULL;
 165         }
 166         return tt;
 167 }
 168
 169 static struct ttm_bo_driver bochs_bo_driver = {
 170         .ttm_tt_create = bochs_ttm_tt_create,
 171         .init_mem_type = bochs_bo_init_mem_type,
 172         .eviction_valuable = ttm_bo_eviction_valuable,
 173         .evict_flags = bochs_bo_evict_flags,
 174         .move = NULL,
 175         .verify_access = bochs_bo_verify_access,
 176         .io_mem_reserve = &bochs_ttm_io_mem_reserve,
 177         .io_mem_free = &bochs_ttm_io_mem_free,
 178 };
 179
 180 int bochs_mm_init(struct bochs_device *bochs)
 181 {
 182         struct ttm_bo_device *bdev = &bochs->ttm.bdev;
 183         int ret;
 184
 185         ret = bochs_ttm_global_init(bochs);
 186         if (ret)
 187                 return ret;
 188
 189         ret = ttm_bo_device_init(&bochs->ttm.bdev,
 190                                  bochs->ttm.bo_global_ref.ref.object,
 191                                  &bochs_bo_driver,
 192                                  bochs->dev->anon_inode->i_mapping,
 193                                  DRM_FILE_PAGE_OFFSET,
 194                                  true);
 195         if (ret) {
 196                 DRM_ERROR("Error initialising bo driver; %d\n", ret);
 197                 return ret;
 198         }
 199
 200         ret = ttm_bo_init_mm(bdev, TTM_PL_VRAM,
 201                              bochs->fb_size >> PAGE_SHIFT);
 202         if (ret) {
 203                 DRM_ERROR("Failed ttm VRAM init: %d\n", ret);
 204                 return ret;
 205         }
 206
 207         bochs->ttm.initialized = true;
 208         return 0;
 209 }
 210
 211 void bochs_mm_fini(struct bochs_device *bochs)
 212 {
 213         if (!bochs->ttm.initialized)
 214                 return;
 215
 216         ttm_bo_device_release(&bochs->ttm.bdev);
 217         bochs_ttm_global_release(bochs);
 218         bochs->ttm.initialized = false;
 219 }
 220
 221 static void bochs_ttm_placement(struct bochs_bo *bo, int domain)
 222 {
 223         unsigned i;
 224         u32 c = 0;
 225         bo->placement.placement = bo->placements;
 226         bo->placement.busy_placement = bo->placements;
 227         if (domain & TTM_PL_FLAG_VRAM) {
 228                 bo->placements[c++].flags = TTM_PL_FLAG_WC
 229                         | TTM_PL_FLAG_UNCACHED
 230                         | TTM_PL_FLAG_VRAM;
 231         }
 232         if (domain & TTM_PL_FLAG_SYSTEM) {
 233                 bo->placements[c++].flags = TTM_PL_MASK_CACHING
 234                         | TTM_PL_FLAG_SYSTEM;
 235         }
 236         if (!c) {
 237                 bo->placements[c++].flags = TTM_PL_MASK_CACHING
 238                         | TTM_PL_FLAG_SYSTEM;
 239         }
 240         for (i = 0; i < c; ++i) {
 241                 bo->placements[i].fpfn = 0;
 242                 bo->placements[i].lpfn = 0;
 243         }
 244         bo->placement.num_placement = c;
 245         bo->placement.num_busy_placement = c;
 246 }
 247
 248 static inline u64 bochs_bo_gpu_offset(struct bochs_bo *bo)
 249 {
 250         return bo->bo.offset;
 251 }
 252
 253 int bochs_bo_pin(struct bochs_bo *bo, u32 pl_flag, u64 *gpu_addr)
 254 {
 255         struct ttm_operation_ctx ctx = { false, false };
 256         int i, ret;
 257
 258         if (bo->pin_count) {
 259                 bo->pin_count++;
 260                 if (gpu_addr)
 261                         *gpu_addr = bochs_bo_gpu_offset(bo);
 262                 return 0;
 263         }
 264
 265         bochs_ttm_placement(bo, pl_flag);
 266         for (i = 0; i < bo->placement.num_placement; i++)
 267                 bo->placements[i].flags |= TTM_PL_FLAG_NO_EVICT;
 268         ret = ttm_bo_validate(&bo->bo, &bo->placement, &ctx);
 269         if (ret)
 270                 return ret;
 271
 272         bo->pin_count = 1;
 273         if (gpu_addr)
 274                 *gpu_addr = bochs_bo_gpu_offset(bo);
 275         return 0;
 276 }
 277
 278 int bochs_bo_unpin(struct bochs_bo *bo)
 279 {
 280         struct ttm_operation_ctx ctx = { false, false };
 281         int i, ret;
 282
 283         if (!bo->pin_count) {
 284                 DRM_ERROR("unpin bad %p\n", bo);
 285                 return 0;
 286         }
 287         bo->pin_count--;
 288
 289         if (bo->pin_count)
 290                 return 0;
 291
 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         return 0;
 299 }
 300
 301 int bochs_mmap(struct file *filp, struct vm_area_struct *vma)
 302 {
 303         struct drm_file *file_priv;
 304         struct bochs_device *bochs;
 305
 306         if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
 307                 return -EINVAL;
 308
 309         file_priv = filp->private_data;
 310         bochs = file_priv->minor->dev->dev_private;
 311         return ttm_bo_mmap(filp, vma, &bochs->ttm.bdev);
 312 }
 313
 314 /* ---------------------------------------------------------------------- */
 315
 316 static int bochs_bo_create(struct drm_device *dev, int size, int align,
 317                            uint32_t flags, struct bochs_bo **pbochsbo)
 318 {
 319         struct bochs_device *bochs = dev->dev_private;
 320         struct bochs_bo *bochsbo;
 321         size_t acc_size;
 322         int ret;
 323
 324         bochsbo = kzalloc(sizeof(struct bochs_bo), GFP_KERNEL);
 325         if (!bochsbo)
 326                 return -ENOMEM;
 327
 328         ret = drm_gem_object_init(dev, &bochsbo->gem, size);
 329         if (ret) {
 330                 kfree(bochsbo);
 331                 return ret;
 332         }
 333
 334         bochsbo->bo.bdev = &bochs->ttm.bdev;
 335         bochsbo->bo.bdev->dev_mapping = dev->anon_inode->i_mapping;
 336
 337         bochs_ttm_placement(bochsbo, TTM_PL_FLAG_VRAM | TTM_PL_FLAG_SYSTEM);
 338
 339         acc_size = ttm_bo_dma_acc_size(&bochs->ttm.bdev, size,
 340                                        sizeof(struct bochs_bo));
 341
 342         ret = ttm_bo_init(&bochs->ttm.bdev, &bochsbo->bo, size,
 343                           ttm_bo_type_device, &bochsbo->placement,
 344                           align >> PAGE_SHIFT, false, acc_size,
 345                           NULL, NULL, bochs_bo_ttm_destroy);
 346         if (ret)
 347                 return ret;
 348
 349         *pbochsbo = bochsbo;
 350         return 0;
 351 }
 352
 353 int bochs_gem_create(struct drm_device *dev, u32 size, bool iskernel,
 354                      struct drm_gem_object **obj)
 355 {
 356         struct bochs_bo *bochsbo;
 357         int ret;
 358
 359         *obj = NULL;
 360
 361         size = PAGE_ALIGN(size);
 362         if (size == 0)
 363                 return -EINVAL;
 364
 365         ret = bochs_bo_create(dev, size, 0, 0, &bochsbo);
 366         if (ret) {
 367                 if (ret != -ERESTARTSYS)
 368                         DRM_ERROR("failed to allocate GEM object\n");
 369                 return ret;
 370         }
 371         *obj = &bochsbo->gem;
 372         return 0;
 373 }
 374
 375 int bochs_dumb_create(struct drm_file *file, struct drm_device *dev,
 376                       struct drm_mode_create_dumb *args)
 377 {
 378         struct drm_gem_object *gobj;
 379         u32 handle;
 380         int ret;
 381
 382         args->pitch = args->width * ((args->bpp + 7) / 8);
 383         args->size = args->pitch * args->height;
 384
 385         ret = bochs_gem_create(dev, args->size, false,
 386                                &gobj);
 387         if (ret)
 388                 return ret;
 389
 390         ret = drm_gem_handle_create(file, gobj, &handle);
 391         drm_gem_object_unreference_unlocked(gobj);
 392         if (ret)
 393                 return ret;
 394
 395         args->handle = handle;
 396         return 0;
 397 }
 398
 399 static void bochs_bo_unref(struct bochs_bo **bo)
 400 {
 401         struct ttm_buffer_object *tbo;
 402
 403         if ((*bo) == NULL)
 404                 return;
 405
 406         tbo = &((*bo)->bo);
 407         ttm_bo_put(tbo);
 408         *bo = NULL;
 409 }
 410
 411 void bochs_gem_free_object(struct drm_gem_object *obj)
 412 {
 413         struct bochs_bo *bochs_bo = gem_to_bochs_bo(obj);
 414
 415         bochs_bo_unref(&bochs_bo);
 416 }
 417
 418 int bochs_dumb_mmap_offset(struct drm_file *file, struct drm_device *dev,
 419                            uint32_t handle, uint64_t *offset)
 420 {
 421         struct drm_gem_object *obj;
 422         struct bochs_bo *bo;
 423
 424         obj = drm_gem_object_lookup(file, handle);
 425         if (obj == NULL)
 426                 return -ENOENT;
 427
 428         bo = gem_to_bochs_bo(obj);
 429         *offset = bochs_bo_mmap_offset(bo);
 430
 431         drm_gem_object_unreference_unlocked(obj);
 432         return 0;
 433 }