drivers/gpu/drm/tegra/gem.c

   1 /*
   2  * NVIDIA Tegra DRM GEM helper functions
   3  *
   4  * Copyright (C) 2012 Sascha Hauer, Pengutronix
   5  * Copyright (C) 2013 NVIDIA CORPORATION, All rights reserved.
   6  *
   7  * Based on the GEM/CMA helpers
   8  *
   9  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  */
  15
  16 #include <linux/dma-buf.h>
  17 #include <drm/tegra_drm.h>
  18
  19 #include "gem.h"
  20
  21 static inline struct tegra_bo *host1x_to_tegra_bo(struct host1x_bo *bo)
  22 {
  23         return container_of(bo, struct tegra_bo, base);
  24 }
  25
  26 static void tegra_bo_put(struct host1x_bo *bo)
  27 {
  28         struct tegra_bo *obj = host1x_to_tegra_bo(bo);
  29         struct drm_device *drm = obj->gem.dev;
  30
  31         mutex_lock(&drm->struct_mutex);
  32         drm_gem_object_unreference(&obj->gem);
  33         mutex_unlock(&drm->struct_mutex);
  34 }
  35
  36 static dma_addr_t tegra_bo_pin(struct host1x_bo *bo, struct sg_table **sgt)
  37 {
  38         struct tegra_bo *obj = host1x_to_tegra_bo(bo);
  39
  40         return obj->paddr;
  41 }
  42
  43 static void tegra_bo_unpin(struct host1x_bo *bo, struct sg_table *sgt)
  44 {
  45 }
  46
  47 static void *tegra_bo_mmap(struct host1x_bo *bo)
  48 {
  49         struct tegra_bo *obj = host1x_to_tegra_bo(bo);
  50
  51         return obj->vaddr;
  52 }
  53
  54 static void tegra_bo_munmap(struct host1x_bo *bo, void *addr)
  55 {
  56 }
  57
  58 static void *tegra_bo_kmap(struct host1x_bo *bo, unsigned int page)
  59 {
  60         struct tegra_bo *obj = host1x_to_tegra_bo(bo);
  61
  62         return obj->vaddr + page * PAGE_SIZE;
  63 }
  64
  65 static void tegra_bo_kunmap(struct host1x_bo *bo, unsigned int page,
  66                             void *addr)
  67 {
  68 }
  69
  70 static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo)
  71 {
  72         struct tegra_bo *obj = host1x_to_tegra_bo(bo);
  73         struct drm_device *drm = obj->gem.dev;
  74
  75         mutex_lock(&drm->struct_mutex);
  76         drm_gem_object_reference(&obj->gem);
  77         mutex_unlock(&drm->struct_mutex);
  78
  79         return bo;
  80 }
  81
  82 static const struct host1x_bo_ops tegra_bo_ops = {
  83         .get = tegra_bo_get,
  84         .put = tegra_bo_put,
  85         .pin = tegra_bo_pin,
  86         .unpin = tegra_bo_unpin,
  87         .mmap = tegra_bo_mmap,
  88         .munmap = tegra_bo_munmap,
  89         .kmap = tegra_bo_kmap,
  90         .kunmap = tegra_bo_kunmap,
  91 };
  92
  93 static void tegra_bo_destroy(struct drm_device *drm, struct tegra_bo *bo)
  94 {
  95         dma_free_writecombine(drm->dev, bo->gem.size, bo->vaddr, bo->paddr);
  96 }
  97
  98 struct tegra_bo *tegra_bo_create(struct drm_device *drm, unsigned int size,
  99                                  unsigned long flags)
 100 {
 101         struct tegra_bo *bo;
 102         int err;
 103
 104         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
 105         if (!bo)
 106                 return ERR_PTR(-ENOMEM);
 107
 108         host1x_bo_init(&bo->base, &tegra_bo_ops);
 109         size = round_up(size, PAGE_SIZE);
 110
 111         bo->vaddr = dma_alloc_writecombine(drm->dev, size, &bo->paddr,
 112                                            GFP_KERNEL | __GFP_NOWARN);
 113         if (!bo->vaddr) {
 114                 dev_err(drm->dev, "failed to allocate buffer with size %u\n",
 115                         size);
 116                 err = -ENOMEM;
 117                 goto err_dma;
 118         }
 119
 120         err = drm_gem_object_init(drm, &bo->gem, size);
 121         if (err)
 122                 goto err_init;
 123
 124         err = drm_gem_create_mmap_offset(&bo->gem);
 125         if (err)
 126                 goto err_mmap;
 127
 128         if (flags & DRM_TEGRA_GEM_CREATE_TILED)
 129                 bo->flags |= TEGRA_BO_TILED;
 130
 131         if (flags & DRM_TEGRA_GEM_CREATE_BOTTOM_UP)
 132                 bo->flags |= TEGRA_BO_BOTTOM_UP;
 133
 134         return bo;
 135
 136 err_mmap:
 137         drm_gem_object_release(&bo->gem);
 138 err_init:
 139         tegra_bo_destroy(drm, bo);
 140 err_dma:
 141         kfree(bo);
 142
 143         return ERR_PTR(err);
 144 }
 145
 146 struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file,
 147                                              struct drm_device *drm,
 148                                              unsigned int size,
 149                                              unsigned long flags,
 150                                              unsigned int *handle)
 151 {
 152         struct tegra_bo *bo;
 153         int ret;
 154
 155         bo = tegra_bo_create(drm, size, flags);
 156         if (IS_ERR(bo))
 157                 return bo;
 158
 159         ret = drm_gem_handle_create(file, &bo->gem, handle);
 160         if (ret)
 161                 goto err;
 162
 163         drm_gem_object_unreference_unlocked(&bo->gem);
 164
 165         return bo;
 166
 167 err:
 168         tegra_bo_free_object(&bo->gem);
 169         return ERR_PTR(ret);
 170 }
 171
 172 struct tegra_bo *tegra_bo_import(struct drm_device *drm, struct dma_buf *buf)
 173 {
 174         struct dma_buf_attachment *attach;
 175         struct tegra_bo *bo;
 176         ssize_t size;
 177         int err;
 178
 179         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
 180         if (!bo)
 181                 return ERR_PTR(-ENOMEM);
 182
 183         host1x_bo_init(&bo->base, &tegra_bo_ops);
 184         size = round_up(buf->size, PAGE_SIZE);
 185
 186         err = drm_gem_object_init(drm, &bo->gem, size);
 187         if (err < 0)
 188                 goto free;
 189
 190         err = drm_gem_create_mmap_offset(&bo->gem);
 191         if (err < 0)
 192                 goto release;
 193
 194         attach = dma_buf_attach(buf, drm->dev);
 195         if (IS_ERR(attach)) {
 196                 err = PTR_ERR(attach);
 197                 goto free_mmap;
 198         }
 199
 200         get_dma_buf(buf);
 201
 202         bo->sgt = dma_buf_map_attachment(attach, DMA_TO_DEVICE);
 203         if (!bo->sgt) {
 204                 err = -ENOMEM;
 205                 goto detach;
 206         }
 207
 208         if (IS_ERR(bo->sgt)) {
 209                 err = PTR_ERR(bo->sgt);
 210                 goto detach;
 211         }
 212
 213         if (bo->sgt->nents > 1) {
 214                 err = -EINVAL;
 215                 goto detach;
 216         }
 217
 218         bo->paddr = sg_dma_address(bo->sgt->sgl);
 219         bo->gem.import_attach = attach;
 220
 221         return bo;
 222
 223 detach:
 224         if (!IS_ERR_OR_NULL(bo->sgt))
 225                 dma_buf_unmap_attachment(attach, bo->sgt, DMA_TO_DEVICE);
 226
 227         dma_buf_detach(buf, attach);
 228         dma_buf_put(buf);
 229 free_mmap:
 230         drm_gem_free_mmap_offset(&bo->gem);
 231 release:
 232         drm_gem_object_release(&bo->gem);
 233 free:
 234         kfree(bo);
 235
 236         return ERR_PTR(err);
 237 }
 238
 239 void tegra_bo_free_object(struct drm_gem_object *gem)
 240 {
 241         struct tegra_bo *bo = to_tegra_bo(gem);
 242
 243         if (gem->import_attach) {
 244                 dma_buf_unmap_attachment(gem->import_attach, bo->sgt,
 245                                          DMA_TO_DEVICE);
 246                 drm_prime_gem_destroy(gem, NULL);
 247         } else {
 248                 tegra_bo_destroy(gem->dev, bo);
 249         }
 250
 251         drm_gem_free_mmap_offset(gem);
 252         drm_gem_object_release(gem);
 253
 254         kfree(bo);
 255 }
 256
 257 int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm,
 258                          struct drm_mode_create_dumb *args)
 259 {
 260         int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
 261         struct tegra_bo *bo;
 262
 263         if (args->pitch < min_pitch)
 264                 args->pitch = min_pitch;
 265
 266         if (args->size < args->pitch * args->height)
 267                 args->size = args->pitch * args->height;
 268
 269         bo = tegra_bo_create_with_handle(file, drm, args->size, 0,
 270                                          &args->handle);
 271         if (IS_ERR(bo))
 272                 return PTR_ERR(bo);
 273
 274         return 0;
 275 }
 276
 277 int tegra_bo_dumb_map_offset(struct drm_file *file, struct drm_device *drm,
 278                              uint32_t handle, uint64_t *offset)
 279 {
 280         struct drm_gem_object *gem;
 281         struct tegra_bo *bo;
 282
 283         mutex_lock(&drm->struct_mutex);
 284
 285         gem = drm_gem_object_lookup(drm, file, handle);
 286         if (!gem) {
 287                 dev_err(drm->dev, "failed to lookup GEM object\n");
 288                 mutex_unlock(&drm->struct_mutex);
 289                 return -EINVAL;
 290         }
 291
 292         bo = to_tegra_bo(gem);
 293
 294         *offset = drm_vma_node_offset_addr(&bo->gem.vma_node);
 295
 296         drm_gem_object_unreference(gem);
 297
 298         mutex_unlock(&drm->struct_mutex);
 299
 300         return 0;
 301 }
 302
 303 const struct vm_operations_struct tegra_bo_vm_ops = {
 304         .open = drm_gem_vm_open,
 305         .close = drm_gem_vm_close,
 306 };
 307
 308 int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
 309 {
 310         struct drm_gem_object *gem;
 311         struct tegra_bo *bo;
 312         int ret;
 313
 314         ret = drm_gem_mmap(file, vma);
 315         if (ret)
 316                 return ret;
 317
 318         gem = vma->vm_private_data;
 319         bo = to_tegra_bo(gem);
 320
 321         ret = remap_pfn_range(vma, vma->vm_start, bo->paddr >> PAGE_SHIFT,
 322                               vma->vm_end - vma->vm_start, vma->vm_page_prot);
 323         if (ret)
 324                 drm_gem_vm_close(vma);
 325
 326         return ret;
 327 }
 328
 329 static struct sg_table *
 330 tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach,
 331                             enum dma_data_direction dir)
 332 {
 333         struct drm_gem_object *gem = attach->dmabuf->priv;
 334         struct tegra_bo *bo = to_tegra_bo(gem);
 335         struct sg_table *sgt;
 336
 337         sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
 338         if (!sgt)
 339                 return NULL;
 340
 341         if (sg_alloc_table(sgt, 1, GFP_KERNEL)) {
 342                 kfree(sgt);
 343                 return NULL;
 344         }
 345
 346         sg_dma_address(sgt->sgl) = bo->paddr;
 347         sg_dma_len(sgt->sgl) = gem->size;
 348
 349         return sgt;
 350 }
 351
 352 static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
 353                                           struct sg_table *sgt,
 354                                           enum dma_data_direction dir)
 355 {
 356         sg_free_table(sgt);
 357         kfree(sgt);
 358 }
 359
 360 static void tegra_gem_prime_release(struct dma_buf *buf)
 361 {
 362         drm_gem_dmabuf_release(buf);
 363 }
 364
 365 static void *tegra_gem_prime_kmap_atomic(struct dma_buf *buf,
 366                                          unsigned long page)
 367 {
 368         return NULL;
 369 }
 370
 371 static void tegra_gem_prime_kunmap_atomic(struct dma_buf *buf,
 372                                           unsigned long page,
 373                                           void *addr)
 374 {
 375 }
 376
 377 static void *tegra_gem_prime_kmap(struct dma_buf *buf, unsigned long page)
 378 {
 379         return NULL;
 380 }
 381
 382 static void tegra_gem_prime_kunmap(struct dma_buf *buf, unsigned long page,
 383                                    void *addr)
 384 {
 385 }
 386
 387 static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
 388 {
 389         return -EINVAL;
 390 }
 391
 392 static void *tegra_gem_prime_vmap(struct dma_buf *buf)
 393 {
 394         struct drm_gem_object *gem = buf->priv;
 395         struct tegra_bo *bo = to_tegra_bo(gem);
 396
 397         return bo->vaddr;
 398 }
 399
 400 static void tegra_gem_prime_vunmap(struct dma_buf *buf, void *vaddr)
 401 {
 402 }
 403
 404 static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = {
 405         .map_dma_buf = tegra_gem_prime_map_dma_buf,
 406         .unmap_dma_buf = tegra_gem_prime_unmap_dma_buf,
 407         .release = tegra_gem_prime_release,
 408         .kmap_atomic = tegra_gem_prime_kmap_atomic,
 409         .kunmap_atomic = tegra_gem_prime_kunmap_atomic,
 410         .kmap = tegra_gem_prime_kmap,
 411         .kunmap = tegra_gem_prime_kunmap,
 412         .mmap = tegra_gem_prime_mmap,
 413         .vmap = tegra_gem_prime_vmap,
 414         .vunmap = tegra_gem_prime_vunmap,
 415 };
 416
 417 struct dma_buf *tegra_gem_prime_export(struct drm_device *drm,
 418                                        struct drm_gem_object *gem,
 419                                        int flags)
 420 {
 421         return dma_buf_export(gem, &tegra_gem_prime_dmabuf_ops, gem->size,
 422                               flags);
 423 }
 424
 425 struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm,
 426                                               struct dma_buf *buf)
 427 {
 428         struct tegra_bo *bo;
 429
 430         if (buf->ops == &tegra_gem_prime_dmabuf_ops) {
 431                 struct drm_gem_object *gem = buf->priv;
 432
 433                 if (gem->dev == drm) {
 434                         drm_gem_object_reference(gem);
 435                         return gem;
 436                 }
 437         }
 438
 439         bo = tegra_bo_import(drm, buf);
 440         if (IS_ERR(bo))
 441                 return ERR_CAST(bo);
 442
 443         return &bo->gem;
 444 }