drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c

   1 /* Hisilicon Hibmc SoC drm driver
   2  *
   3  * Based on the bochs drm driver.
   4  *
   5  * Copyright (c) 2016 Huawei Limited.
   6  *
   7  * Author:
   8  *      Rongrong Zou <zourongrong@huawei.com>
   9  *      Rongrong Zou <zourongrong@gmail.com>
  10  *      Jianhua Li <lijianhua@huawei.com>
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  */
  18
  19 #include <drm/drm_atomic_helper.h>
  20 #include <drm/ttm/ttm_page_alloc.h>
  21
  22 #include "hibmc_drm_drv.h"
  23
  24 #define DRM_FILE_PAGE_OFFSET (0x100000000ULL >> PAGE_SHIFT)
  25
  26 static inline struct hibmc_drm_private *
  27 hibmc_bdev(struct ttm_bo_device *bd)
  28 {
  29         return container_of(bd, struct hibmc_drm_private, bdev);
  30 }
  31
  32 static int
  33 hibmc_ttm_mem_global_init(struct drm_global_reference *ref)
  34 {
  35         return ttm_mem_global_init(ref->object);
  36 }
  37
  38 static void
  39 hibmc_ttm_mem_global_release(struct drm_global_reference *ref)
  40 {
  41         ttm_mem_global_release(ref->object);
  42 }
  43
  44 static int hibmc_ttm_global_init(struct hibmc_drm_private *hibmc)
  45 {
  46         int ret;
  47
  48         hibmc->mem_global_ref.global_type = DRM_GLOBAL_TTM_MEM;
  49         hibmc->mem_global_ref.size = sizeof(struct ttm_mem_global);
  50         hibmc->mem_global_ref.init = &hibmc_ttm_mem_global_init;
  51         hibmc->mem_global_ref.release = &hibmc_ttm_mem_global_release;
  52         ret = drm_global_item_ref(&hibmc->mem_global_ref);
  53         if (ret) {
  54                 DRM_ERROR("could not get ref on ttm global: %d\n", ret);
  55                 return ret;
  56         }
  57
  58         hibmc->bo_global_ref.mem_glob =
  59                 hibmc->mem_global_ref.object;
  60         hibmc->bo_global_ref.ref.global_type = DRM_GLOBAL_TTM_BO;
  61         hibmc->bo_global_ref.ref.size = sizeof(struct ttm_bo_global);
  62         hibmc->bo_global_ref.ref.init = &ttm_bo_global_init;
  63         hibmc->bo_global_ref.ref.release = &ttm_bo_global_release;
  64         ret = drm_global_item_ref(&hibmc->bo_global_ref.ref);
  65         if (ret) {
  66                 DRM_ERROR("failed setting up TTM BO subsystem: %d\n", ret);
  67                 drm_global_item_unref(&hibmc->mem_global_ref);
  68                 return ret;
  69         }
  70         return 0;
  71 }
  72
  73 static void
  74 hibmc_ttm_global_release(struct hibmc_drm_private *hibmc)
  75 {
  76         drm_global_item_unref(&hibmc->bo_global_ref.ref);
  77         drm_global_item_unref(&hibmc->mem_global_ref);
  78         hibmc->mem_global_ref.release = NULL;
  79 }
  80
  81 static void hibmc_bo_ttm_destroy(struct ttm_buffer_object *tbo)
  82 {
  83         struct hibmc_bo *bo = container_of(tbo, struct hibmc_bo, bo);
  84
  85         drm_gem_object_release(&bo->gem);
  86         kfree(bo);
  87 }
  88
  89 static bool hibmc_ttm_bo_is_hibmc_bo(struct ttm_buffer_object *bo)
  90 {
  91         return bo->destroy == &hibmc_bo_ttm_destroy;
  92 }
  93
  94 static int
  95 hibmc_bo_init_mem_type(struct ttm_bo_device *bdev, u32 type,
  96                        struct ttm_mem_type_manager *man)
  97 {
  98         switch (type) {
  99         case TTM_PL_SYSTEM:
 100                 man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
 101                 man->available_caching = TTM_PL_MASK_CACHING;
 102                 man->default_caching = TTM_PL_FLAG_CACHED;
 103                 break;
 104         case TTM_PL_VRAM:
 105                 man->func = &ttm_bo_manager_func;
 106                 man->flags = TTM_MEMTYPE_FLAG_FIXED |
 107                         TTM_MEMTYPE_FLAG_MAPPABLE;
 108                 man->available_caching = TTM_PL_FLAG_UNCACHED |
 109                         TTM_PL_FLAG_WC;
 110                 man->default_caching = TTM_PL_FLAG_WC;
 111                 break;
 112         default:
 113                 DRM_ERROR("unsupported memory type %u\n", type);
 114                 return -EINVAL;
 115         }
 116         return 0;
 117 }
 118
 119 void hibmc_ttm_placement(struct hibmc_bo *bo, int domain)
 120 {
 121         u32 count = 0;
 122         u32 i;
 123
 124         bo->placement.placement = bo->placements;
 125         bo->placement.busy_placement = bo->placements;
 126         if (domain & TTM_PL_FLAG_VRAM)
 127                 bo->placements[count++].flags = TTM_PL_FLAG_WC |
 128                         TTM_PL_FLAG_UNCACHED | TTM_PL_FLAG_VRAM;
 129         if (domain & TTM_PL_FLAG_SYSTEM)
 130                 bo->placements[count++].flags = TTM_PL_MASK_CACHING |
 131                         TTM_PL_FLAG_SYSTEM;
 132         if (!count)
 133                 bo->placements[count++].flags = TTM_PL_MASK_CACHING |
 134                         TTM_PL_FLAG_SYSTEM;
 135
 136         bo->placement.num_placement = count;
 137         bo->placement.num_busy_placement = count;
 138         for (i = 0; i < count; i++) {
 139                 bo->placements[i].fpfn = 0;
 140                 bo->placements[i].lpfn = 0;
 141         }
 142 }
 143
 144 static void
 145 hibmc_bo_evict_flags(struct ttm_buffer_object *bo, struct ttm_placement *pl)
 146 {
 147         struct hibmc_bo *hibmcbo = hibmc_bo(bo);
 148
 149         if (!hibmc_ttm_bo_is_hibmc_bo(bo))
 150                 return;
 151
 152         hibmc_ttm_placement(hibmcbo, TTM_PL_FLAG_SYSTEM);
 153         *pl = hibmcbo->placement;
 154 }
 155
 156 static int hibmc_bo_verify_access(struct ttm_buffer_object *bo,
 157                                   struct file *filp)
 158 {
 159         struct hibmc_bo *hibmcbo = hibmc_bo(bo);
 160
 161         return drm_vma_node_verify_access(&hibmcbo->gem.vma_node,
 162                                           filp->private_data);
 163 }
 164
 165 static int hibmc_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
 166                                     struct ttm_mem_reg *mem)
 167 {
 168         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
 169         struct hibmc_drm_private *hibmc = hibmc_bdev(bdev);
 170
 171         mem->bus.addr = NULL;
 172         mem->bus.offset = 0;
 173         mem->bus.size = mem->num_pages << PAGE_SHIFT;
 174         mem->bus.base = 0;
 175         mem->bus.is_iomem = false;
 176         if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
 177                 return -EINVAL;
 178         switch (mem->mem_type) {
 179         case TTM_PL_SYSTEM:
 180                 /* system memory */
 181                 return 0;
 182         case TTM_PL_VRAM:
 183                 mem->bus.offset = mem->start << PAGE_SHIFT;
 184                 mem->bus.base = pci_resource_start(hibmc->dev->pdev, 0);
 185                 mem->bus.is_iomem = true;
 186                 break;
 187         default:
 188                 return -EINVAL;
 189         }
 190         return 0;
 191 }
 192
 193 static void hibmc_ttm_backend_destroy(struct ttm_tt *tt)
 194 {
 195         ttm_tt_fini(tt);
 196         kfree(tt);
 197 }
 198
 199 static struct ttm_backend_func hibmc_tt_backend_func = {
 200         .destroy = &hibmc_ttm_backend_destroy,
 201 };
 202
 203 static struct ttm_tt *hibmc_ttm_tt_create(struct ttm_bo_device *bdev,
 204                                           unsigned long size,
 205                                           u32 page_flags,
 206                                           struct page *dummy_read_page)
 207 {
 208         struct ttm_tt *tt;
 209         int ret;
 210
 211         tt = kzalloc(sizeof(*tt), GFP_KERNEL);
 212         if (!tt) {
 213                 DRM_ERROR("failed to allocate ttm_tt\n");
 214                 return NULL;
 215         }
 216         tt->func = &hibmc_tt_backend_func;
 217         ret = ttm_tt_init(tt, bdev, size, page_flags, dummy_read_page);
 218         if (ret) {
 219                 DRM_ERROR("failed to initialize ttm_tt: %d\n", ret);
 220                 kfree(tt);
 221                 return NULL;
 222         }
 223         return tt;
 224 }
 225
 226 static int hibmc_ttm_tt_populate(struct ttm_tt *ttm)
 227 {
 228         return ttm_pool_populate(ttm);
 229 }
 230
 231 static void hibmc_ttm_tt_unpopulate(struct ttm_tt *ttm)
 232 {
 233         ttm_pool_unpopulate(ttm);
 234 }
 235
 236 struct ttm_bo_driver hibmc_bo_driver = {
 237         .ttm_tt_create          = hibmc_ttm_tt_create,
 238         .ttm_tt_populate        = hibmc_ttm_tt_populate,
 239         .ttm_tt_unpopulate      = hibmc_ttm_tt_unpopulate,
 240         .init_mem_type          = hibmc_bo_init_mem_type,
 241         .evict_flags            = hibmc_bo_evict_flags,
 242         .move                   = NULL,
 243         .verify_access          = hibmc_bo_verify_access,
 244         .io_mem_reserve         = &hibmc_ttm_io_mem_reserve,
 245         .io_mem_free            = NULL,
 246 };
 247
 248 int hibmc_mm_init(struct hibmc_drm_private *hibmc)
 249 {
 250         int ret;
 251         struct drm_device *dev = hibmc->dev;
 252         struct ttm_bo_device *bdev = &hibmc->bdev;
 253
 254         ret = hibmc_ttm_global_init(hibmc);
 255         if (ret)
 256                 return ret;
 257
 258         ret = ttm_bo_device_init(&hibmc->bdev,
 259                                  hibmc->bo_global_ref.ref.object,
 260                                  &hibmc_bo_driver,
 261                                  dev->anon_inode->i_mapping,
 262                                  DRM_FILE_PAGE_OFFSET,
 263                                  true);
 264         if (ret) {
 265                 hibmc_ttm_global_release(hibmc);
 266                 DRM_ERROR("error initializing bo driver: %d\n", ret);
 267                 return ret;
 268         }
 269
 270         ret = ttm_bo_init_mm(bdev, TTM_PL_VRAM,
 271                              hibmc->fb_size >> PAGE_SHIFT);
 272         if (ret) {
 273                 hibmc_ttm_global_release(hibmc);
 274                 DRM_ERROR("failed ttm VRAM init: %d\n", ret);
 275                 return ret;
 276         }
 277
 278         hibmc->mm_inited = true;
 279         return 0;
 280 }
 281
 282 void hibmc_mm_fini(struct hibmc_drm_private *hibmc)
 283 {
 284         if (!hibmc->mm_inited)
 285                 return;
 286
 287         ttm_bo_device_release(&hibmc->bdev);
 288         hibmc_ttm_global_release(hibmc);
 289         hibmc->mm_inited = false;
 290 }
 291
 292 static void hibmc_bo_unref(struct hibmc_bo **bo)
 293 {
 294         struct ttm_buffer_object *tbo;
 295
 296         if ((*bo) == NULL)
 297                 return;
 298
 299         tbo = &((*bo)->bo);
 300         ttm_bo_unref(&tbo);
 301         *bo = NULL;
 302 }
 303
 304 int hibmc_bo_create(struct drm_device *dev, int size, int align,
 305                     u32 flags, struct hibmc_bo **phibmcbo)
 306 {
 307         struct hibmc_drm_private *hibmc = dev->dev_private;
 308         struct hibmc_bo *hibmcbo;
 309         size_t acc_size;
 310         int ret;
 311
 312         hibmcbo = kzalloc(sizeof(*hibmcbo), GFP_KERNEL);
 313         if (!hibmcbo) {
 314                 DRM_ERROR("failed to allocate hibmcbo\n");
 315                 return -ENOMEM;
 316         }
 317         ret = drm_gem_object_init(dev, &hibmcbo->gem, size);
 318         if (ret) {
 319                 DRM_ERROR("failed to initialize drm gem object: %d\n", ret);
 320                 kfree(hibmcbo);
 321                 return ret;
 322         }
 323
 324         hibmcbo->bo.bdev = &hibmc->bdev;
 325
 326         hibmc_ttm_placement(hibmcbo, TTM_PL_FLAG_VRAM | TTM_PL_FLAG_SYSTEM);
 327
 328         acc_size = ttm_bo_dma_acc_size(&hibmc->bdev, size,
 329                                        sizeof(struct hibmc_bo));
 330
 331         ret = ttm_bo_init(&hibmc->bdev, &hibmcbo->bo, size,
 332                           ttm_bo_type_device, &hibmcbo->placement,
 333                           align >> PAGE_SHIFT, false, NULL, acc_size,
 334                           NULL, NULL, hibmc_bo_ttm_destroy);
 335         if (ret) {
 336                 hibmc_bo_unref(&hibmcbo);
 337                 DRM_ERROR("failed to initialize ttm_bo: %d\n", ret);
 338                 return ret;
 339         }
 340
 341         *phibmcbo = hibmcbo;
 342         return 0;
 343 }
 344
 345 int hibmc_bo_pin(struct hibmc_bo *bo, u32 pl_flag, u64 *gpu_addr)
 346 {
 347         int i, ret;
 348
 349         if (bo->pin_count) {
 350                 bo->pin_count++;
 351                 if (gpu_addr)
 352                         *gpu_addr = bo->bo.offset;
 353                 return 0;
 354         }
 355
 356         hibmc_ttm_placement(bo, pl_flag);
 357         for (i = 0; i < bo->placement.num_placement; i++)
 358                 bo->placements[i].flags |= TTM_PL_FLAG_NO_EVICT;
 359         ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false);
 360         if (ret)
 361                 return ret;
 362
 363         bo->pin_count = 1;
 364         if (gpu_addr)
 365                 *gpu_addr = bo->bo.offset;
 366         return 0;
 367 }
 368
 369 int hibmc_bo_unpin(struct hibmc_bo *bo)
 370 {
 371         int i, ret;
 372
 373         if (!bo->pin_count) {
 374                 DRM_ERROR("unpin bad %p\n", bo);
 375                 return 0;
 376         }
 377         bo->pin_count--;
 378         if (bo->pin_count)
 379                 return 0;
 380
 381         for (i = 0; i < bo->placement.num_placement ; i++)
 382                 bo->placements[i].flags &= ~TTM_PL_FLAG_NO_EVICT;
 383         ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false);
 384         if (ret) {
 385                 DRM_ERROR("validate failed for unpin: %d\n", ret);
 386                 return ret;
 387         }
 388
 389         return 0;
 390 }
 391
 392 int hibmc_mmap(struct file *filp, struct vm_area_struct *vma)
 393 {
 394         struct drm_file *file_priv;
 395         struct hibmc_drm_private *hibmc;
 396
 397         if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
 398                 return -EINVAL;
 399
 400         file_priv = filp->private_data;
 401         hibmc = file_priv->minor->dev->dev_private;
 402         return ttm_bo_mmap(filp, vma, &hibmc->bdev);
 403 }
 404
 405 int hibmc_gem_create(struct drm_device *dev, u32 size, bool iskernel,
 406                      struct drm_gem_object **obj)
 407 {
 408         struct hibmc_bo *hibmcbo;
 409         int ret;
 410
 411         *obj = NULL;
 412
 413         size = PAGE_ALIGN(size);
 414         if (size == 0) {
 415                 DRM_ERROR("error: zero size\n");
 416                 return -EINVAL;
 417         }
 418
 419         ret = hibmc_bo_create(dev, size, 0, 0, &hibmcbo);
 420         if (ret) {
 421                 if (ret != -ERESTARTSYS)
 422                         DRM_ERROR("failed to allocate GEM object: %d\n", ret);
 423                 return ret;
 424         }
 425         *obj = &hibmcbo->gem;
 426         return 0;
 427 }
 428
 429 int hibmc_dumb_create(struct drm_file *file, struct drm_device *dev,
 430                       struct drm_mode_create_dumb *args)
 431 {
 432         struct drm_gem_object *gobj;
 433         u32 handle;
 434         int ret;
 435
 436         args->pitch = ALIGN(args->width * DIV_ROUND_UP(args->bpp, 8), 16);
 437         args->size = args->pitch * args->height;
 438
 439         ret = hibmc_gem_create(dev, args->size, false,
 440                                &gobj);
 441         if (ret) {
 442                 DRM_ERROR("failed to create GEM object: %d\n", ret);
 443                 return ret;
 444         }
 445
 446         ret = drm_gem_handle_create(file, gobj, &handle);
 447         drm_gem_object_unreference_unlocked(gobj);
 448         if (ret) {
 449                 DRM_ERROR("failed to unreference GEM object: %d\n", ret);
 450                 return ret;
 451         }
 452
 453         args->handle = handle;
 454         return 0;
 455 }
 456
 457 void hibmc_gem_free_object(struct drm_gem_object *obj)
 458 {
 459         struct hibmc_bo *hibmcbo = gem_to_hibmc_bo(obj);
 460
 461         hibmc_bo_unref(&hibmcbo);
 462 }
 463
 464 static u64 hibmc_bo_mmap_offset(struct hibmc_bo *bo)
 465 {
 466         return drm_vma_node_offset_addr(&bo->bo.vma_node);
 467 }
 468
 469 int hibmc_dumb_mmap_offset(struct drm_file *file, struct drm_device *dev,
 470                            u32 handle, u64 *offset)
 471 {
 472         struct drm_gem_object *obj;
 473         struct hibmc_bo *bo;
 474
 475         obj = drm_gem_object_lookup(file, handle);
 476         if (!obj)
 477                 return -ENOENT;
 478
 479         bo = gem_to_hibmc_bo(obj);
 480         *offset = hibmc_bo_mmap_offset(bo);
 481
 482         drm_gem_object_unreference_unlocked(obj);
 483         return 0;
 484 }
 485
 486 static void hibmc_user_framebuffer_destroy(struct drm_framebuffer *fb)
 487 {
 488         struct hibmc_framebuffer *hibmc_fb = to_hibmc_framebuffer(fb);
 489
 490         drm_gem_object_unreference_unlocked(hibmc_fb->obj);
 491         drm_framebuffer_cleanup(fb);
 492         kfree(hibmc_fb);
 493 }
 494
 495 static const struct drm_framebuffer_funcs hibmc_fb_funcs = {
 496         .destroy = hibmc_user_framebuffer_destroy,
 497 };
 498
 499 struct hibmc_framebuffer *
 500 hibmc_framebuffer_init(struct drm_device *dev,
 501                        const struct drm_mode_fb_cmd2 *mode_cmd,
 502                        struct drm_gem_object *obj)
 503 {
 504         struct hibmc_framebuffer *hibmc_fb;
 505         int ret;
 506
 507         hibmc_fb = kzalloc(sizeof(*hibmc_fb), GFP_KERNEL);
 508         if (!hibmc_fb) {
 509                 DRM_ERROR("failed to allocate hibmc_fb\n");
 510                 return ERR_PTR(-ENOMEM);
 511         }
 512
 513         drm_helper_mode_fill_fb_struct(dev, &hibmc_fb->fb, mode_cmd);
 514         hibmc_fb->obj = obj;
 515         ret = drm_framebuffer_init(dev, &hibmc_fb->fb, &hibmc_fb_funcs);
 516         if (ret) {
 517                 DRM_ERROR("drm_framebuffer_init failed: %d\n", ret);
 518                 kfree(hibmc_fb);
 519                 return ERR_PTR(ret);
 520         }
 521
 522         return hibmc_fb;
 523 }
 524
 525 static struct drm_framebuffer *
 526 hibmc_user_framebuffer_create(struct drm_device *dev,
 527                               struct drm_file *filp,
 528                               const struct drm_mode_fb_cmd2 *mode_cmd)
 529 {
 530         struct drm_gem_object *obj;
 531         struct hibmc_framebuffer *hibmc_fb;
 532
 533         DRM_DEBUG_DRIVER("%dx%d, format %c%c%c%c\n",
 534                          mode_cmd->width, mode_cmd->height,
 535                          (mode_cmd->pixel_format) & 0xff,
 536                          (mode_cmd->pixel_format >> 8)  & 0xff,
 537                          (mode_cmd->pixel_format >> 16) & 0xff,
 538                          (mode_cmd->pixel_format >> 24) & 0xff);
 539
 540         obj = drm_gem_object_lookup(filp, mode_cmd->handles[0]);
 541         if (!obj)
 542                 return ERR_PTR(-ENOENT);
 543
 544         hibmc_fb = hibmc_framebuffer_init(dev, mode_cmd, obj);
 545         if (IS_ERR(hibmc_fb)) {
 546                 drm_gem_object_unreference_unlocked(obj);
 547                 return ERR_PTR((long)hibmc_fb);
 548         }
 549         return &hibmc_fb->fb;
 550 }
 551
 552 const struct drm_mode_config_funcs hibmc_mode_funcs = {
 553         .atomic_check = drm_atomic_helper_check,
 554         .atomic_commit = drm_atomic_helper_commit,
 555         .fb_create = hibmc_user_framebuffer_create,
 556 };