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 void hibmc_bo_ttm_destroy(struct ttm_buffer_object *tbo)
  33 {
  34         struct hibmc_bo *bo = container_of(tbo, struct hibmc_bo, bo);
  35
  36         drm_gem_object_release(&bo->gem);
  37         kfree(bo);
  38 }
  39
  40 static bool hibmc_ttm_bo_is_hibmc_bo(struct ttm_buffer_object *bo)
  41 {
  42         return bo->destroy == &hibmc_bo_ttm_destroy;
  43 }
  44
  45 static int
  46 hibmc_bo_init_mem_type(struct ttm_bo_device *bdev, u32 type,
  47                        struct ttm_mem_type_manager *man)
  48 {
  49         switch (type) {
  50         case TTM_PL_SYSTEM:
  51                 man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
  52                 man->available_caching = TTM_PL_MASK_CACHING;
  53                 man->default_caching = TTM_PL_FLAG_CACHED;
  54                 break;
  55         case TTM_PL_VRAM:
  56                 man->func = &ttm_bo_manager_func;
  57                 man->flags = TTM_MEMTYPE_FLAG_FIXED |
  58                         TTM_MEMTYPE_FLAG_MAPPABLE;
  59                 man->available_caching = TTM_PL_FLAG_UNCACHED |
  60                         TTM_PL_FLAG_WC;
  61                 man->default_caching = TTM_PL_FLAG_WC;
  62                 break;
  63         default:
  64                 DRM_ERROR("unsupported memory type %u\n", type);
  65                 return -EINVAL;
  66         }
  67         return 0;
  68 }
  69
  70 void hibmc_ttm_placement(struct hibmc_bo *bo, int domain)
  71 {
  72         u32 count = 0;
  73         u32 i;
  74
  75         bo->placement.placement = bo->placements;
  76         bo->placement.busy_placement = bo->placements;
  77         if (domain & TTM_PL_FLAG_VRAM)
  78                 bo->placements[count++].flags = TTM_PL_FLAG_WC |
  79                         TTM_PL_FLAG_UNCACHED | TTM_PL_FLAG_VRAM;
  80         if (domain & TTM_PL_FLAG_SYSTEM)
  81                 bo->placements[count++].flags = TTM_PL_MASK_CACHING |
  82                         TTM_PL_FLAG_SYSTEM;
  83         if (!count)
  84                 bo->placements[count++].flags = TTM_PL_MASK_CACHING |
  85                         TTM_PL_FLAG_SYSTEM;
  86
  87         bo->placement.num_placement = count;
  88         bo->placement.num_busy_placement = count;
  89         for (i = 0; i < count; i++) {
  90                 bo->placements[i].fpfn = 0;
  91                 bo->placements[i].lpfn = 0;
  92         }
  93 }
  94
  95 static void
  96 hibmc_bo_evict_flags(struct ttm_buffer_object *bo, struct ttm_placement *pl)
  97 {
  98         struct hibmc_bo *hibmcbo = hibmc_bo(bo);
  99
 100         if (!hibmc_ttm_bo_is_hibmc_bo(bo))
 101                 return;
 102
 103         hibmc_ttm_placement(hibmcbo, TTM_PL_FLAG_SYSTEM);
 104         *pl = hibmcbo->placement;
 105 }
 106
 107 static int hibmc_bo_verify_access(struct ttm_buffer_object *bo,
 108                                   struct file *filp)
 109 {
 110         struct hibmc_bo *hibmcbo = hibmc_bo(bo);
 111
 112         return drm_vma_node_verify_access(&hibmcbo->gem.vma_node,
 113                                           filp->private_data);
 114 }
 115
 116 static int hibmc_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
 117                                     struct ttm_mem_reg *mem)
 118 {
 119         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
 120         struct hibmc_drm_private *hibmc = hibmc_bdev(bdev);
 121
 122         mem->bus.addr = NULL;
 123         mem->bus.offset = 0;
 124         mem->bus.size = mem->num_pages << PAGE_SHIFT;
 125         mem->bus.base = 0;
 126         mem->bus.is_iomem = false;
 127         if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
 128                 return -EINVAL;
 129         switch (mem->mem_type) {
 130         case TTM_PL_SYSTEM:
 131                 /* system memory */
 132                 return 0;
 133         case TTM_PL_VRAM:
 134                 mem->bus.offset = mem->start << PAGE_SHIFT;
 135                 mem->bus.base = pci_resource_start(hibmc->dev->pdev, 0);
 136                 mem->bus.is_iomem = true;
 137                 break;
 138         default:
 139                 return -EINVAL;
 140         }
 141         return 0;
 142 }
 143
 144 static void hibmc_ttm_backend_destroy(struct ttm_tt *tt)
 145 {
 146         ttm_tt_fini(tt);
 147         kfree(tt);
 148 }
 149
 150 static struct ttm_backend_func hibmc_tt_backend_func = {
 151         .destroy = &hibmc_ttm_backend_destroy,
 152 };
 153
 154 static struct ttm_tt *hibmc_ttm_tt_create(struct ttm_buffer_object *bo,
 155                                           u32 page_flags)
 156 {
 157         struct ttm_tt *tt;
 158         int ret;
 159
 160         tt = kzalloc(sizeof(*tt), GFP_KERNEL);
 161         if (!tt) {
 162                 DRM_ERROR("failed to allocate ttm_tt\n");
 163                 return NULL;
 164         }
 165         tt->func = &hibmc_tt_backend_func;
 166         ret = ttm_tt_init(tt, bo, page_flags);
 167         if (ret) {
 168                 DRM_ERROR("failed to initialize ttm_tt: %d\n", ret);
 169                 kfree(tt);
 170                 return NULL;
 171         }
 172         return tt;
 173 }
 174
 175 struct ttm_bo_driver hibmc_bo_driver = {
 176         .ttm_tt_create          = hibmc_ttm_tt_create,
 177         .init_mem_type          = hibmc_bo_init_mem_type,
 178         .evict_flags            = hibmc_bo_evict_flags,
 179         .move                   = NULL,
 180         .verify_access          = hibmc_bo_verify_access,
 181         .io_mem_reserve         = &hibmc_ttm_io_mem_reserve,
 182         .io_mem_free            = NULL,
 183 };
 184
 185 int hibmc_mm_init(struct hibmc_drm_private *hibmc)
 186 {
 187         int ret;
 188         struct drm_device *dev = hibmc->dev;
 189         struct ttm_bo_device *bdev = &hibmc->bdev;
 190
 191         ret = ttm_bo_device_init(&hibmc->bdev,
 192                                  &hibmc_bo_driver,
 193                                  dev->anon_inode->i_mapping,
 194                                  DRM_FILE_PAGE_OFFSET,
 195                                  true);
 196         if (ret) {
 197                 DRM_ERROR("error initializing bo driver: %d\n", ret);
 198                 return ret;
 199         }
 200
 201         ret = ttm_bo_init_mm(bdev, TTM_PL_VRAM,
 202                              hibmc->fb_size >> PAGE_SHIFT);
 203         if (ret) {
 204                 DRM_ERROR("failed ttm VRAM init: %d\n", ret);
 205                 return ret;
 206         }
 207
 208         hibmc->mm_inited = true;
 209         return 0;
 210 }
 211
 212 void hibmc_mm_fini(struct hibmc_drm_private *hibmc)
 213 {
 214         if (!hibmc->mm_inited)
 215                 return;
 216
 217         ttm_bo_device_release(&hibmc->bdev);
 218         hibmc->mm_inited = false;
 219 }
 220
 221 static void hibmc_bo_unref(struct hibmc_bo **bo)
 222 {
 223         struct ttm_buffer_object *tbo;
 224
 225         if ((*bo) == NULL)
 226                 return;
 227
 228         tbo = &((*bo)->bo);
 229         ttm_bo_put(tbo);
 230         *bo = NULL;
 231 }
 232
 233 int hibmc_bo_create(struct drm_device *dev, int size, int align,
 234                     u32 flags, struct hibmc_bo **phibmcbo)
 235 {
 236         struct hibmc_drm_private *hibmc = dev->dev_private;
 237         struct hibmc_bo *hibmcbo;
 238         size_t acc_size;
 239         int ret;
 240
 241         hibmcbo = kzalloc(sizeof(*hibmcbo), GFP_KERNEL);
 242         if (!hibmcbo) {
 243                 DRM_ERROR("failed to allocate hibmcbo\n");
 244                 return -ENOMEM;
 245         }
 246         ret = drm_gem_object_init(dev, &hibmcbo->gem, size);
 247         if (ret) {
 248                 DRM_ERROR("failed to initialize drm gem object: %d\n", ret);
 249                 kfree(hibmcbo);
 250                 return ret;
 251         }
 252
 253         hibmcbo->bo.bdev = &hibmc->bdev;
 254
 255         hibmc_ttm_placement(hibmcbo, TTM_PL_FLAG_VRAM | TTM_PL_FLAG_SYSTEM);
 256
 257         acc_size = ttm_bo_dma_acc_size(&hibmc->bdev, size,
 258                                        sizeof(struct hibmc_bo));
 259
 260         ret = ttm_bo_init(&hibmc->bdev, &hibmcbo->bo, size,
 261                           ttm_bo_type_device, &hibmcbo->placement,
 262                           align >> PAGE_SHIFT, false, acc_size,
 263                           NULL, NULL, hibmc_bo_ttm_destroy);
 264         if (ret) {
 265                 hibmc_bo_unref(&hibmcbo);
 266                 DRM_ERROR("failed to initialize ttm_bo: %d\n", ret);
 267                 return ret;
 268         }
 269
 270         *phibmcbo = hibmcbo;
 271         return 0;
 272 }
 273
 274 int hibmc_bo_pin(struct hibmc_bo *bo, u32 pl_flag, u64 *gpu_addr)
 275 {
 276         struct ttm_operation_ctx ctx = { false, false };
 277         int i, ret;
 278
 279         if (bo->pin_count) {
 280                 bo->pin_count++;
 281                 if (gpu_addr)
 282                         *gpu_addr = bo->bo.offset;
 283                 return 0;
 284         }
 285
 286         hibmc_ttm_placement(bo, pl_flag);
 287         for (i = 0; i < bo->placement.num_placement; i++)
 288                 bo->placements[i].flags |= TTM_PL_FLAG_NO_EVICT;
 289         ret = ttm_bo_validate(&bo->bo, &bo->placement, &ctx);
 290         if (ret)
 291                 return ret;
 292
 293         bo->pin_count = 1;
 294         if (gpu_addr)
 295                 *gpu_addr = bo->bo.offset;
 296         return 0;
 297 }
 298
 299 int hibmc_bo_unpin(struct hibmc_bo *bo)
 300 {
 301         struct ttm_operation_ctx ctx = { false, false };
 302         int i, ret;
 303
 304         if (!bo->pin_count) {
 305                 DRM_ERROR("unpin bad %p\n", bo);
 306                 return 0;
 307         }
 308         bo->pin_count--;
 309         if (bo->pin_count)
 310                 return 0;
 311
 312         for (i = 0; i < bo->placement.num_placement ; i++)
 313                 bo->placements[i].flags &= ~TTM_PL_FLAG_NO_EVICT;
 314         ret = ttm_bo_validate(&bo->bo, &bo->placement, &ctx);
 315         if (ret) {
 316                 DRM_ERROR("validate failed for unpin: %d\n", ret);
 317                 return ret;
 318         }
 319
 320         return 0;
 321 }
 322
 323 int hibmc_mmap(struct file *filp, struct vm_area_struct *vma)
 324 {
 325         struct drm_file *file_priv;
 326         struct hibmc_drm_private *hibmc;
 327
 328         if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
 329                 return -EINVAL;
 330
 331         file_priv = filp->private_data;
 332         hibmc = file_priv->minor->dev->dev_private;
 333         return ttm_bo_mmap(filp, vma, &hibmc->bdev);
 334 }
 335
 336 int hibmc_gem_create(struct drm_device *dev, u32 size, bool iskernel,
 337                      struct drm_gem_object **obj)
 338 {
 339         struct hibmc_bo *hibmcbo;
 340         int ret;
 341
 342         *obj = NULL;
 343
 344         size = PAGE_ALIGN(size);
 345         if (size == 0) {
 346                 DRM_ERROR("error: zero size\n");
 347                 return -EINVAL;
 348         }
 349
 350         ret = hibmc_bo_create(dev, size, 0, 0, &hibmcbo);
 351         if (ret) {
 352                 if (ret != -ERESTARTSYS)
 353                         DRM_ERROR("failed to allocate GEM object: %d\n", ret);
 354                 return ret;
 355         }
 356         *obj = &hibmcbo->gem;
 357         return 0;
 358 }
 359
 360 int hibmc_dumb_create(struct drm_file *file, struct drm_device *dev,
 361                       struct drm_mode_create_dumb *args)
 362 {
 363         struct drm_gem_object *gobj;
 364         u32 handle;
 365         int ret;
 366
 367         args->pitch = ALIGN(args->width * DIV_ROUND_UP(args->bpp, 8), 16);
 368         args->size = args->pitch * args->height;
 369
 370         ret = hibmc_gem_create(dev, args->size, false,
 371                                &gobj);
 372         if (ret) {
 373                 DRM_ERROR("failed to create GEM object: %d\n", ret);
 374                 return ret;
 375         }
 376
 377         ret = drm_gem_handle_create(file, gobj, &handle);
 378         drm_gem_object_put_unlocked(gobj);
 379         if (ret) {
 380                 DRM_ERROR("failed to unreference GEM object: %d\n", ret);
 381                 return ret;
 382         }
 383
 384         args->handle = handle;
 385         return 0;
 386 }
 387
 388 void hibmc_gem_free_object(struct drm_gem_object *obj)
 389 {
 390         struct hibmc_bo *hibmcbo = gem_to_hibmc_bo(obj);
 391
 392         hibmc_bo_unref(&hibmcbo);
 393 }
 394
 395 static u64 hibmc_bo_mmap_offset(struct hibmc_bo *bo)
 396 {
 397         return drm_vma_node_offset_addr(&bo->bo.vma_node);
 398 }
 399
 400 int hibmc_dumb_mmap_offset(struct drm_file *file, struct drm_device *dev,
 401                            u32 handle, u64 *offset)
 402 {
 403         struct drm_gem_object *obj;
 404         struct hibmc_bo *bo;
 405
 406         obj = drm_gem_object_lookup(file, handle);
 407         if (!obj)
 408                 return -ENOENT;
 409
 410         bo = gem_to_hibmc_bo(obj);
 411         *offset = hibmc_bo_mmap_offset(bo);
 412
 413         drm_gem_object_put_unlocked(obj);
 414         return 0;
 415 }
 416
 417 static void hibmc_user_framebuffer_destroy(struct drm_framebuffer *fb)
 418 {
 419         struct hibmc_framebuffer *hibmc_fb = to_hibmc_framebuffer(fb);
 420
 421         drm_gem_object_put_unlocked(hibmc_fb->obj);
 422         drm_framebuffer_cleanup(fb);
 423         kfree(hibmc_fb);
 424 }
 425
 426 static const struct drm_framebuffer_funcs hibmc_fb_funcs = {
 427         .destroy = hibmc_user_framebuffer_destroy,
 428 };
 429
 430 struct hibmc_framebuffer *
 431 hibmc_framebuffer_init(struct drm_device *dev,
 432                        const struct drm_mode_fb_cmd2 *mode_cmd,
 433                        struct drm_gem_object *obj)
 434 {
 435         struct hibmc_framebuffer *hibmc_fb;
 436         int ret;
 437
 438         hibmc_fb = kzalloc(sizeof(*hibmc_fb), GFP_KERNEL);
 439         if (!hibmc_fb) {
 440                 DRM_ERROR("failed to allocate hibmc_fb\n");
 441                 return ERR_PTR(-ENOMEM);
 442         }
 443
 444         drm_helper_mode_fill_fb_struct(dev, &hibmc_fb->fb, mode_cmd);
 445         hibmc_fb->obj = obj;
 446         ret = drm_framebuffer_init(dev, &hibmc_fb->fb, &hibmc_fb_funcs);
 447         if (ret) {
 448                 DRM_ERROR("drm_framebuffer_init failed: %d\n", ret);
 449                 kfree(hibmc_fb);
 450                 return ERR_PTR(ret);
 451         }
 452
 453         return hibmc_fb;
 454 }
 455
 456 static struct drm_framebuffer *
 457 hibmc_user_framebuffer_create(struct drm_device *dev,
 458                               struct drm_file *filp,
 459                               const struct drm_mode_fb_cmd2 *mode_cmd)
 460 {
 461         struct drm_gem_object *obj;
 462         struct hibmc_framebuffer *hibmc_fb;
 463
 464         DRM_DEBUG_DRIVER("%dx%d, format %c%c%c%c\n",
 465                          mode_cmd->width, mode_cmd->height,
 466                          (mode_cmd->pixel_format) & 0xff,
 467                          (mode_cmd->pixel_format >> 8)  & 0xff,
 468                          (mode_cmd->pixel_format >> 16) & 0xff,
 469                          (mode_cmd->pixel_format >> 24) & 0xff);
 470
 471         obj = drm_gem_object_lookup(filp, mode_cmd->handles[0]);
 472         if (!obj)
 473                 return ERR_PTR(-ENOENT);
 474
 475         hibmc_fb = hibmc_framebuffer_init(dev, mode_cmd, obj);
 476         if (IS_ERR(hibmc_fb)) {
 477                 drm_gem_object_put_unlocked(obj);
 478                 return ERR_PTR((long)hibmc_fb);
 479         }
 480         return &hibmc_fb->fb;
 481 }
 482
 483 const struct drm_mode_config_funcs hibmc_mode_funcs = {
 484         .atomic_check = drm_atomic_helper_check,
 485         .atomic_commit = drm_atomic_helper_commit,
 486         .fb_create = hibmc_user_framebuffer_create,
 487 };