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                 struct ttm_operation_ctx *ctx)
 228 {
 229         return ttm_pool_populate(ttm, ctx);
 230 }
 231
 232 static void hibmc_ttm_tt_unpopulate(struct ttm_tt *ttm)
 233 {
 234         ttm_pool_unpopulate(ttm);
 235 }
 236
 237 struct ttm_bo_driver hibmc_bo_driver = {
 238         .ttm_tt_create          = hibmc_ttm_tt_create,
 239         .ttm_tt_populate        = hibmc_ttm_tt_populate,
 240         .ttm_tt_unpopulate      = hibmc_ttm_tt_unpopulate,
 241         .init_mem_type          = hibmc_bo_init_mem_type,
 242         .evict_flags            = hibmc_bo_evict_flags,
 243         .move                   = NULL,
 244         .verify_access          = hibmc_bo_verify_access,
 245         .io_mem_reserve         = &hibmc_ttm_io_mem_reserve,
 246         .io_mem_free            = NULL,
 247 };
 248
 249 int hibmc_mm_init(struct hibmc_drm_private *hibmc)
 250 {
 251         int ret;
 252         struct drm_device *dev = hibmc->dev;
 253         struct ttm_bo_device *bdev = &hibmc->bdev;
 254
 255         ret = hibmc_ttm_global_init(hibmc);
 256         if (ret)
 257                 return ret;
 258
 259         ret = ttm_bo_device_init(&hibmc->bdev,
 260                                  hibmc->bo_global_ref.ref.object,
 261                                  &hibmc_bo_driver,
 262                                  dev->anon_inode->i_mapping,
 263                                  DRM_FILE_PAGE_OFFSET,
 264                                  true);
 265         if (ret) {
 266                 hibmc_ttm_global_release(hibmc);
 267                 DRM_ERROR("error initializing bo driver: %d\n", ret);
 268                 return ret;
 269         }
 270
 271         ret = ttm_bo_init_mm(bdev, TTM_PL_VRAM,
 272                              hibmc->fb_size >> PAGE_SHIFT);
 273         if (ret) {
 274                 hibmc_ttm_global_release(hibmc);
 275                 DRM_ERROR("failed ttm VRAM init: %d\n", ret);
 276                 return ret;
 277         }
 278
 279         hibmc->mm_inited = true;
 280         return 0;
 281 }
 282
 283 void hibmc_mm_fini(struct hibmc_drm_private *hibmc)
 284 {
 285         if (!hibmc->mm_inited)
 286                 return;
 287
 288         ttm_bo_device_release(&hibmc->bdev);
 289         hibmc_ttm_global_release(hibmc);
 290         hibmc->mm_inited = false;
 291 }
 292
 293 static void hibmc_bo_unref(struct hibmc_bo **bo)
 294 {
 295         struct ttm_buffer_object *tbo;
 296
 297         if ((*bo) == NULL)
 298                 return;
 299
 300         tbo = &((*bo)->bo);
 301         ttm_bo_unref(&tbo);
 302         *bo = NULL;
 303 }
 304
 305 int hibmc_bo_create(struct drm_device *dev, int size, int align,
 306                     u32 flags, struct hibmc_bo **phibmcbo)
 307 {
 308         struct hibmc_drm_private *hibmc = dev->dev_private;
 309         struct hibmc_bo *hibmcbo;
 310         size_t acc_size;
 311         int ret;
 312
 313         hibmcbo = kzalloc(sizeof(*hibmcbo), GFP_KERNEL);
 314         if (!hibmcbo) {
 315                 DRM_ERROR("failed to allocate hibmcbo\n");
 316                 return -ENOMEM;
 317         }
 318         ret = drm_gem_object_init(dev, &hibmcbo->gem, size);
 319         if (ret) {
 320                 DRM_ERROR("failed to initialize drm gem object: %d\n", ret);
 321                 kfree(hibmcbo);
 322                 return ret;
 323         }
 324
 325         hibmcbo->bo.bdev = &hibmc->bdev;
 326
 327         hibmc_ttm_placement(hibmcbo, TTM_PL_FLAG_VRAM | TTM_PL_FLAG_SYSTEM);
 328
 329         acc_size = ttm_bo_dma_acc_size(&hibmc->bdev, size,
 330                                        sizeof(struct hibmc_bo));
 331
 332         ret = ttm_bo_init(&hibmc->bdev, &hibmcbo->bo, size,
 333                           ttm_bo_type_device, &hibmcbo->placement,
 334                           align >> PAGE_SHIFT, false, NULL, acc_size,
 335                           NULL, NULL, hibmc_bo_ttm_destroy);
 336         if (ret) {
 337                 hibmc_bo_unref(&hibmcbo);
 338                 DRM_ERROR("failed to initialize ttm_bo: %d\n", ret);
 339                 return ret;
 340         }
 341
 342         *phibmcbo = hibmcbo;
 343         return 0;
 344 }
 345
 346 int hibmc_bo_pin(struct hibmc_bo *bo, u32 pl_flag, u64 *gpu_addr)
 347 {
 348         struct ttm_operation_ctx ctx = { false, false };
 349         int i, ret;
 350
 351         if (bo->pin_count) {
 352                 bo->pin_count++;
 353                 if (gpu_addr)
 354                         *gpu_addr = bo->bo.offset;
 355                 return 0;
 356         }
 357
 358         hibmc_ttm_placement(bo, pl_flag);
 359         for (i = 0; i < bo->placement.num_placement; i++)
 360                 bo->placements[i].flags |= TTM_PL_FLAG_NO_EVICT;
 361         ret = ttm_bo_validate(&bo->bo, &bo->placement, &ctx);
 362         if (ret)
 363                 return ret;
 364
 365         bo->pin_count = 1;
 366         if (gpu_addr)
 367                 *gpu_addr = bo->bo.offset;
 368         return 0;
 369 }
 370
 371 int hibmc_bo_unpin(struct hibmc_bo *bo)
 372 {
 373         struct ttm_operation_ctx ctx = { false, false };
 374         int i, ret;
 375
 376         if (!bo->pin_count) {
 377                 DRM_ERROR("unpin bad %p\n", bo);
 378                 return 0;
 379         }
 380         bo->pin_count--;
 381         if (bo->pin_count)
 382                 return 0;
 383
 384         for (i = 0; i < bo->placement.num_placement ; i++)
 385                 bo->placements[i].flags &= ~TTM_PL_FLAG_NO_EVICT;
 386         ret = ttm_bo_validate(&bo->bo, &bo->placement, &ctx);
 387         if (ret) {
 388                 DRM_ERROR("validate failed for unpin: %d\n", ret);
 389                 return ret;
 390         }
 391
 392         return 0;
 393 }
 394
 395 int hibmc_mmap(struct file *filp, struct vm_area_struct *vma)
 396 {
 397         struct drm_file *file_priv;
 398         struct hibmc_drm_private *hibmc;
 399
 400         if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
 401                 return -EINVAL;
 402
 403         file_priv = filp->private_data;
 404         hibmc = file_priv->minor->dev->dev_private;
 405         return ttm_bo_mmap(filp, vma, &hibmc->bdev);
 406 }
 407
 408 int hibmc_gem_create(struct drm_device *dev, u32 size, bool iskernel,
 409                      struct drm_gem_object **obj)
 410 {
 411         struct hibmc_bo *hibmcbo;
 412         int ret;
 413
 414         *obj = NULL;
 415
 416         size = PAGE_ALIGN(size);
 417         if (size == 0) {
 418                 DRM_ERROR("error: zero size\n");
 419                 return -EINVAL;
 420         }
 421
 422         ret = hibmc_bo_create(dev, size, 0, 0, &hibmcbo);
 423         if (ret) {
 424                 if (ret != -ERESTARTSYS)
 425                         DRM_ERROR("failed to allocate GEM object: %d\n", ret);
 426                 return ret;
 427         }
 428         *obj = &hibmcbo->gem;
 429         return 0;
 430 }
 431
 432 int hibmc_dumb_create(struct drm_file *file, struct drm_device *dev,
 433                       struct drm_mode_create_dumb *args)
 434 {
 435         struct drm_gem_object *gobj;
 436         u32 handle;
 437         int ret;
 438
 439         args->pitch = ALIGN(args->width * DIV_ROUND_UP(args->bpp, 8), 16);
 440         args->size = args->pitch * args->height;
 441
 442         ret = hibmc_gem_create(dev, args->size, false,
 443                                &gobj);
 444         if (ret) {
 445                 DRM_ERROR("failed to create GEM object: %d\n", ret);
 446                 return ret;
 447         }
 448
 449         ret = drm_gem_handle_create(file, gobj, &handle);
 450         drm_gem_object_put_unlocked(gobj);
 451         if (ret) {
 452                 DRM_ERROR("failed to unreference GEM object: %d\n", ret);
 453                 return ret;
 454         }
 455
 456         args->handle = handle;
 457         return 0;
 458 }
 459
 460 void hibmc_gem_free_object(struct drm_gem_object *obj)
 461 {
 462         struct hibmc_bo *hibmcbo = gem_to_hibmc_bo(obj);
 463
 464         hibmc_bo_unref(&hibmcbo);
 465 }
 466
 467 static u64 hibmc_bo_mmap_offset(struct hibmc_bo *bo)
 468 {
 469         return drm_vma_node_offset_addr(&bo->bo.vma_node);
 470 }
 471
 472 int hibmc_dumb_mmap_offset(struct drm_file *file, struct drm_device *dev,
 473                            u32 handle, u64 *offset)
 474 {
 475         struct drm_gem_object *obj;
 476         struct hibmc_bo *bo;
 477
 478         obj = drm_gem_object_lookup(file, handle);
 479         if (!obj)
 480                 return -ENOENT;
 481
 482         bo = gem_to_hibmc_bo(obj);
 483         *offset = hibmc_bo_mmap_offset(bo);
 484
 485         drm_gem_object_put_unlocked(obj);
 486         return 0;
 487 }
 488
 489 static void hibmc_user_framebuffer_destroy(struct drm_framebuffer *fb)
 490 {
 491         struct hibmc_framebuffer *hibmc_fb = to_hibmc_framebuffer(fb);
 492
 493         drm_gem_object_put_unlocked(hibmc_fb->obj);
 494         drm_framebuffer_cleanup(fb);
 495         kfree(hibmc_fb);
 496 }
 497
 498 static const struct drm_framebuffer_funcs hibmc_fb_funcs = {
 499         .destroy = hibmc_user_framebuffer_destroy,
 500 };
 501
 502 struct hibmc_framebuffer *
 503 hibmc_framebuffer_init(struct drm_device *dev,
 504                        const struct drm_mode_fb_cmd2 *mode_cmd,
 505                        struct drm_gem_object *obj)
 506 {
 507         struct hibmc_framebuffer *hibmc_fb;
 508         int ret;
 509
 510         hibmc_fb = kzalloc(sizeof(*hibmc_fb), GFP_KERNEL);
 511         if (!hibmc_fb) {
 512                 DRM_ERROR("failed to allocate hibmc_fb\n");
 513                 return ERR_PTR(-ENOMEM);
 514         }
 515
 516         drm_helper_mode_fill_fb_struct(dev, &hibmc_fb->fb, mode_cmd);
 517         hibmc_fb->obj = obj;
 518         ret = drm_framebuffer_init(dev, &hibmc_fb->fb, &hibmc_fb_funcs);
 519         if (ret) {
 520                 DRM_ERROR("drm_framebuffer_init failed: %d\n", ret);
 521                 kfree(hibmc_fb);
 522                 return ERR_PTR(ret);
 523         }
 524
 525         return hibmc_fb;
 526 }
 527
 528 static struct drm_framebuffer *
 529 hibmc_user_framebuffer_create(struct drm_device *dev,
 530                               struct drm_file *filp,
 531                               const struct drm_mode_fb_cmd2 *mode_cmd)
 532 {
 533         struct drm_gem_object *obj;
 534         struct hibmc_framebuffer *hibmc_fb;
 535
 536         DRM_DEBUG_DRIVER("%dx%d, format %c%c%c%c\n",
 537                          mode_cmd->width, mode_cmd->height,
 538                          (mode_cmd->pixel_format) & 0xff,
 539                          (mode_cmd->pixel_format >> 8)  & 0xff,
 540                          (mode_cmd->pixel_format >> 16) & 0xff,
 541                          (mode_cmd->pixel_format >> 24) & 0xff);
 542
 543         obj = drm_gem_object_lookup(filp, mode_cmd->handles[0]);
 544         if (!obj)
 545                 return ERR_PTR(-ENOENT);
 546
 547         hibmc_fb = hibmc_framebuffer_init(dev, mode_cmd, obj);
 548         if (IS_ERR(hibmc_fb)) {
 549                 drm_gem_object_put_unlocked(obj);
 550                 return ERR_PTR((long)hibmc_fb);
 551         }
 552         return &hibmc_fb->fb;
 553 }
 554
 555 const struct drm_mode_config_funcs hibmc_mode_funcs = {
 556         .atomic_check = drm_atomic_helper_check,
 557         .atomic_commit = drm_atomic_helper_commit,
 558         .fb_create = hibmc_user_framebuffer_create,
 559 };