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_buffer_object *bo,
 204                                           u32 page_flags)
 205 {
 206         struct ttm_tt *tt;
 207         int ret;
 208
 209         tt = kzalloc(sizeof(*tt), GFP_KERNEL);
 210         if (!tt) {
 211                 DRM_ERROR("failed to allocate ttm_tt\n");
 212                 return NULL;
 213         }
 214         tt->func = &hibmc_tt_backend_func;
 215         ret = ttm_tt_init(tt, bo, page_flags);
 216         if (ret) {
 217                 DRM_ERROR("failed to initialize ttm_tt: %d\n", ret);
 218                 kfree(tt);
 219                 return NULL;
 220         }
 221         return tt;
 222 }
 223
 224 struct ttm_bo_driver hibmc_bo_driver = {
 225         .ttm_tt_create          = hibmc_ttm_tt_create,
 226         .init_mem_type          = hibmc_bo_init_mem_type,
 227         .evict_flags            = hibmc_bo_evict_flags,
 228         .move                   = NULL,
 229         .verify_access          = hibmc_bo_verify_access,
 230         .io_mem_reserve         = &hibmc_ttm_io_mem_reserve,
 231         .io_mem_free            = NULL,
 232 };
 233
 234 int hibmc_mm_init(struct hibmc_drm_private *hibmc)
 235 {
 236         int ret;
 237         struct drm_device *dev = hibmc->dev;
 238         struct ttm_bo_device *bdev = &hibmc->bdev;
 239
 240         ret = hibmc_ttm_global_init(hibmc);
 241         if (ret)
 242                 return ret;
 243
 244         ret = ttm_bo_device_init(&hibmc->bdev,
 245                                  hibmc->bo_global_ref.ref.object,
 246                                  &hibmc_bo_driver,
 247                                  dev->anon_inode->i_mapping,
 248                                  DRM_FILE_PAGE_OFFSET,
 249                                  true);
 250         if (ret) {
 251                 hibmc_ttm_global_release(hibmc);
 252                 DRM_ERROR("error initializing bo driver: %d\n", ret);
 253                 return ret;
 254         }
 255
 256         ret = ttm_bo_init_mm(bdev, TTM_PL_VRAM,
 257                              hibmc->fb_size >> PAGE_SHIFT);
 258         if (ret) {
 259                 hibmc_ttm_global_release(hibmc);
 260                 DRM_ERROR("failed ttm VRAM init: %d\n", ret);
 261                 return ret;
 262         }
 263
 264         hibmc->mm_inited = true;
 265         return 0;
 266 }
 267
 268 void hibmc_mm_fini(struct hibmc_drm_private *hibmc)
 269 {
 270         if (!hibmc->mm_inited)
 271                 return;
 272
 273         ttm_bo_device_release(&hibmc->bdev);
 274         hibmc_ttm_global_release(hibmc);
 275         hibmc->mm_inited = false;
 276 }
 277
 278 static void hibmc_bo_unref(struct hibmc_bo **bo)
 279 {
 280         struct ttm_buffer_object *tbo;
 281
 282         if ((*bo) == NULL)
 283                 return;
 284
 285         tbo = &((*bo)->bo);
 286         ttm_bo_unref(&tbo);
 287         *bo = NULL;
 288 }
 289
 290 int hibmc_bo_create(struct drm_device *dev, int size, int align,
 291                     u32 flags, struct hibmc_bo **phibmcbo)
 292 {
 293         struct hibmc_drm_private *hibmc = dev->dev_private;
 294         struct hibmc_bo *hibmcbo;
 295         size_t acc_size;
 296         int ret;
 297
 298         hibmcbo = kzalloc(sizeof(*hibmcbo), GFP_KERNEL);
 299         if (!hibmcbo) {
 300                 DRM_ERROR("failed to allocate hibmcbo\n");
 301                 return -ENOMEM;
 302         }
 303         ret = drm_gem_object_init(dev, &hibmcbo->gem, size);
 304         if (ret) {
 305                 DRM_ERROR("failed to initialize drm gem object: %d\n", ret);
 306                 kfree(hibmcbo);
 307                 return ret;
 308         }
 309
 310         hibmcbo->bo.bdev = &hibmc->bdev;
 311
 312         hibmc_ttm_placement(hibmcbo, TTM_PL_FLAG_VRAM | TTM_PL_FLAG_SYSTEM);
 313
 314         acc_size = ttm_bo_dma_acc_size(&hibmc->bdev, size,
 315                                        sizeof(struct hibmc_bo));
 316
 317         ret = ttm_bo_init(&hibmc->bdev, &hibmcbo->bo, size,
 318                           ttm_bo_type_device, &hibmcbo->placement,
 319                           align >> PAGE_SHIFT, false, acc_size,
 320                           NULL, NULL, hibmc_bo_ttm_destroy);
 321         if (ret) {
 322                 hibmc_bo_unref(&hibmcbo);
 323                 DRM_ERROR("failed to initialize ttm_bo: %d\n", ret);
 324                 return ret;
 325         }
 326
 327         *phibmcbo = hibmcbo;
 328         return 0;
 329 }
 330
 331 int hibmc_bo_pin(struct hibmc_bo *bo, u32 pl_flag, u64 *gpu_addr)
 332 {
 333         struct ttm_operation_ctx ctx = { false, false };
 334         int i, ret;
 335
 336         if (bo->pin_count) {
 337                 bo->pin_count++;
 338                 if (gpu_addr)
 339                         *gpu_addr = bo->bo.offset;
 340                 return 0;
 341         }
 342
 343         hibmc_ttm_placement(bo, pl_flag);
 344         for (i = 0; i < bo->placement.num_placement; i++)
 345                 bo->placements[i].flags |= TTM_PL_FLAG_NO_EVICT;
 346         ret = ttm_bo_validate(&bo->bo, &bo->placement, &ctx);
 347         if (ret)
 348                 return ret;
 349
 350         bo->pin_count = 1;
 351         if (gpu_addr)
 352                 *gpu_addr = bo->bo.offset;
 353         return 0;
 354 }
 355
 356 int hibmc_bo_unpin(struct hibmc_bo *bo)
 357 {
 358         struct ttm_operation_ctx ctx = { false, false };
 359         int i, ret;
 360
 361         if (!bo->pin_count) {
 362                 DRM_ERROR("unpin bad %p\n", bo);
 363                 return 0;
 364         }
 365         bo->pin_count--;
 366         if (bo->pin_count)
 367                 return 0;
 368
 369         for (i = 0; i < bo->placement.num_placement ; i++)
 370                 bo->placements[i].flags &= ~TTM_PL_FLAG_NO_EVICT;
 371         ret = ttm_bo_validate(&bo->bo, &bo->placement, &ctx);
 372         if (ret) {
 373                 DRM_ERROR("validate failed for unpin: %d\n", ret);
 374                 return ret;
 375         }
 376
 377         return 0;
 378 }
 379
 380 int hibmc_mmap(struct file *filp, struct vm_area_struct *vma)
 381 {
 382         struct drm_file *file_priv;
 383         struct hibmc_drm_private *hibmc;
 384
 385         if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
 386                 return -EINVAL;
 387
 388         file_priv = filp->private_data;
 389         hibmc = file_priv->minor->dev->dev_private;
 390         return ttm_bo_mmap(filp, vma, &hibmc->bdev);
 391 }
 392
 393 int hibmc_gem_create(struct drm_device *dev, u32 size, bool iskernel,
 394                      struct drm_gem_object **obj)
 395 {
 396         struct hibmc_bo *hibmcbo;
 397         int ret;
 398
 399         *obj = NULL;
 400
 401         size = PAGE_ALIGN(size);
 402         if (size == 0) {
 403                 DRM_ERROR("error: zero size\n");
 404                 return -EINVAL;
 405         }
 406
 407         ret = hibmc_bo_create(dev, size, 0, 0, &hibmcbo);
 408         if (ret) {
 409                 if (ret != -ERESTARTSYS)
 410                         DRM_ERROR("failed to allocate GEM object: %d\n", ret);
 411                 return ret;
 412         }
 413         *obj = &hibmcbo->gem;
 414         return 0;
 415 }
 416
 417 int hibmc_dumb_create(struct drm_file *file, struct drm_device *dev,
 418                       struct drm_mode_create_dumb *args)
 419 {
 420         struct drm_gem_object *gobj;
 421         u32 handle;
 422         int ret;
 423
 424         args->pitch = ALIGN(args->width * DIV_ROUND_UP(args->bpp, 8), 16);
 425         args->size = args->pitch * args->height;
 426
 427         ret = hibmc_gem_create(dev, args->size, false,
 428                                &gobj);
 429         if (ret) {
 430                 DRM_ERROR("failed to create GEM object: %d\n", ret);
 431                 return ret;
 432         }
 433
 434         ret = drm_gem_handle_create(file, gobj, &handle);
 435         drm_gem_object_put_unlocked(gobj);
 436         if (ret) {
 437                 DRM_ERROR("failed to unreference GEM object: %d\n", ret);
 438                 return ret;
 439         }
 440
 441         args->handle = handle;
 442         return 0;
 443 }
 444
 445 void hibmc_gem_free_object(struct drm_gem_object *obj)
 446 {
 447         struct hibmc_bo *hibmcbo = gem_to_hibmc_bo(obj);
 448
 449         hibmc_bo_unref(&hibmcbo);
 450 }
 451
 452 static u64 hibmc_bo_mmap_offset(struct hibmc_bo *bo)
 453 {
 454         return drm_vma_node_offset_addr(&bo->bo.vma_node);
 455 }
 456
 457 int hibmc_dumb_mmap_offset(struct drm_file *file, struct drm_device *dev,
 458                            u32 handle, u64 *offset)
 459 {
 460         struct drm_gem_object *obj;
 461         struct hibmc_bo *bo;
 462
 463         obj = drm_gem_object_lookup(file, handle);
 464         if (!obj)
 465                 return -ENOENT;
 466
 467         bo = gem_to_hibmc_bo(obj);
 468         *offset = hibmc_bo_mmap_offset(bo);
 469
 470         drm_gem_object_put_unlocked(obj);
 471         return 0;
 472 }
 473
 474 static void hibmc_user_framebuffer_destroy(struct drm_framebuffer *fb)
 475 {
 476         struct hibmc_framebuffer *hibmc_fb = to_hibmc_framebuffer(fb);
 477
 478         drm_gem_object_put_unlocked(hibmc_fb->obj);
 479         drm_framebuffer_cleanup(fb);
 480         kfree(hibmc_fb);
 481 }
 482
 483 static const struct drm_framebuffer_funcs hibmc_fb_funcs = {
 484         .destroy = hibmc_user_framebuffer_destroy,
 485 };
 486
 487 struct hibmc_framebuffer *
 488 hibmc_framebuffer_init(struct drm_device *dev,
 489                        const struct drm_mode_fb_cmd2 *mode_cmd,
 490                        struct drm_gem_object *obj)
 491 {
 492         struct hibmc_framebuffer *hibmc_fb;
 493         int ret;
 494
 495         hibmc_fb = kzalloc(sizeof(*hibmc_fb), GFP_KERNEL);
 496         if (!hibmc_fb) {
 497                 DRM_ERROR("failed to allocate hibmc_fb\n");
 498                 return ERR_PTR(-ENOMEM);
 499         }
 500
 501         drm_helper_mode_fill_fb_struct(dev, &hibmc_fb->fb, mode_cmd);
 502         hibmc_fb->obj = obj;
 503         ret = drm_framebuffer_init(dev, &hibmc_fb->fb, &hibmc_fb_funcs);
 504         if (ret) {
 505                 DRM_ERROR("drm_framebuffer_init failed: %d\n", ret);
 506                 kfree(hibmc_fb);
 507                 return ERR_PTR(ret);
 508         }
 509
 510         return hibmc_fb;
 511 }
 512
 513 static struct drm_framebuffer *
 514 hibmc_user_framebuffer_create(struct drm_device *dev,
 515                               struct drm_file *filp,
 516                               const struct drm_mode_fb_cmd2 *mode_cmd)
 517 {
 518         struct drm_gem_object *obj;
 519         struct hibmc_framebuffer *hibmc_fb;
 520
 521         DRM_DEBUG_DRIVER("%dx%d, format %c%c%c%c\n",
 522                          mode_cmd->width, mode_cmd->height,
 523                          (mode_cmd->pixel_format) & 0xff,
 524                          (mode_cmd->pixel_format >> 8)  & 0xff,
 525                          (mode_cmd->pixel_format >> 16) & 0xff,
 526                          (mode_cmd->pixel_format >> 24) & 0xff);
 527
 528         obj = drm_gem_object_lookup(filp, mode_cmd->handles[0]);
 529         if (!obj)
 530                 return ERR_PTR(-ENOENT);
 531
 532         hibmc_fb = hibmc_framebuffer_init(dev, mode_cmd, obj);
 533         if (IS_ERR(hibmc_fb)) {
 534                 drm_gem_object_put_unlocked(obj);
 535                 return ERR_PTR((long)hibmc_fb);
 536         }
 537         return &hibmc_fb->fb;
 538 }
 539
 540 const struct drm_mode_config_funcs hibmc_mode_funcs = {
 541         .atomic_check = drm_atomic_helper_check,
 542         .atomic_commit = drm_atomic_helper_commit,
 543         .fb_create = hibmc_user_framebuffer_create,
 544 };