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->tiling.mode = TEGRA_BO_TILING_MODE_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 static struct tegra_bo *tegra_bo_import(struct drm_device *drm,
 173                                         struct dma_buf *buf)
 174 {
 175         struct dma_buf_attachment *attach;
 176         struct tegra_bo *bo;
 177         ssize_t size;
 178         int err;
 179
 180         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
 181         if (!bo)
 182                 return ERR_PTR(-ENOMEM);
 183
 184         host1x_bo_init(&bo->base, &tegra_bo_ops);
 185         size = round_up(buf->size, PAGE_SIZE);
 186
 187         err = drm_gem_object_init(drm, &bo->gem, size);
 188         if (err < 0)
 189                 goto free;
 190
 191         err = drm_gem_create_mmap_offset(&bo->gem);
 192         if (err < 0)
 193                 goto release;
 194
 195         attach = dma_buf_attach(buf, drm->dev);
 196         if (IS_ERR(attach)) {
 197                 err = PTR_ERR(attach);
 198                 goto free_mmap;
 199         }
 200
 201         get_dma_buf(buf);
 202
 203         bo->sgt = dma_buf_map_attachment(attach, DMA_TO_DEVICE);
 204         if (!bo->sgt) {
 205                 err = -ENOMEM;
 206                 goto detach;
 207         }
 208
 209         if (IS_ERR(bo->sgt)) {
 210                 err = PTR_ERR(bo->sgt);
 211                 goto detach;
 212         }
 213
 214         if (bo->sgt->nents > 1) {
 215                 err = -EINVAL;
 216                 goto detach;
 217         }
 218
 219         bo->paddr = sg_dma_address(bo->sgt->sgl);
 220         bo->gem.import_attach = attach;
 221
 222         return bo;
 223
 224 detach:
 225         if (!IS_ERR_OR_NULL(bo->sgt))
 226                 dma_buf_unmap_attachment(attach, bo->sgt, DMA_TO_DEVICE);
 227
 228         dma_buf_detach(buf, attach);
 229         dma_buf_put(buf);
 230 free_mmap:
 231         drm_gem_free_mmap_offset(&bo->gem);
 232 release:
 233         drm_gem_object_release(&bo->gem);
 234 free:
 235         kfree(bo);
 236
 237         return ERR_PTR(err);
 238 }
 239
 240 void tegra_bo_free_object(struct drm_gem_object *gem)
 241 {
 242         struct tegra_bo *bo = to_tegra_bo(gem);
 243
 244         if (gem->import_attach) {
 245                 dma_buf_unmap_attachment(gem->import_attach, bo->sgt,
 246                                          DMA_TO_DEVICE);
 247                 drm_prime_gem_destroy(gem, NULL);
 248         } else {
 249                 tegra_bo_destroy(gem->dev, bo);
 250         }
 251
 252         drm_gem_free_mmap_offset(gem);
 253         drm_gem_object_release(gem);
 254
 255         kfree(bo);
 256 }
 257
 258 int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm,
 259                          struct drm_mode_create_dumb *args)
 260 {
 261         int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
 262         struct tegra_bo *bo;
 263
 264         if (args->pitch < min_pitch)
 265                 args->pitch = min_pitch;
 266
 267         if (args->size < args->pitch * args->height)
 268                 args->size = args->pitch * args->height;
 269
 270         bo = tegra_bo_create_with_handle(file, drm, args->size, 0,
 271                                          &args->handle);
 272         if (IS_ERR(bo))
 273                 return PTR_ERR(bo);
 274
 275         return 0;
 276 }
 277
 278 int tegra_bo_dumb_map_offset(struct drm_file *file, struct drm_device *drm,
 279                              uint32_t handle, uint64_t *offset)
 280 {
 281         struct drm_gem_object *gem;
 282         struct tegra_bo *bo;
 283
 284         mutex_lock(&drm->struct_mutex);
 285
 286         gem = drm_gem_object_lookup(drm, file, handle);
 287         if (!gem) {
 288                 dev_err(drm->dev, "failed to lookup GEM object\n");
 289                 mutex_unlock(&drm->struct_mutex);
 290                 return -EINVAL;
 291         }
 292
 293         bo = to_tegra_bo(gem);
 294
 295         *offset = drm_vma_node_offset_addr(&bo->gem.vma_node);
 296
 297         drm_gem_object_unreference(gem);
 298
 299         mutex_unlock(&drm->struct_mutex);
 300
 301         return 0;
 302 }
 303
 304 const struct vm_operations_struct tegra_bo_vm_ops = {
 305         .open = drm_gem_vm_open,
 306         .close = drm_gem_vm_close,
 307 };
 308
 309 int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
 310 {
 311         struct drm_gem_object *gem;
 312         struct tegra_bo *bo;
 313         int ret;
 314
 315         ret = drm_gem_mmap(file, vma);
 316         if (ret)
 317                 return ret;
 318
 319         gem = vma->vm_private_data;
 320         bo = to_tegra_bo(gem);
 321
 322         ret = remap_pfn_range(vma, vma->vm_start, bo->paddr >> PAGE_SHIFT,
 323                               vma->vm_end - vma->vm_start, vma->vm_page_prot);
 324         if (ret)
 325                 drm_gem_vm_close(vma);
 326
 327         return ret;
 328 }
 329
 330 static struct sg_table *
 331 tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach,
 332                             enum dma_data_direction dir)
 333 {
 334         struct drm_gem_object *gem = attach->dmabuf->priv;
 335         struct tegra_bo *bo = to_tegra_bo(gem);
 336         struct sg_table *sgt;
 337
 338         sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
 339         if (!sgt)
 340                 return NULL;
 341
 342         if (sg_alloc_table(sgt, 1, GFP_KERNEL)) {
 343                 kfree(sgt);
 344                 return NULL;
 345         }
 346
 347         sg_dma_address(sgt->sgl) = bo->paddr;
 348         sg_dma_len(sgt->sgl) = gem->size;
 349
 350         return sgt;
 351 }
 352
 353 static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
 354                                           struct sg_table *sgt,
 355                                           enum dma_data_direction dir)
 356 {
 357         sg_free_table(sgt);
 358         kfree(sgt);
 359 }
 360
 361 static void tegra_gem_prime_release(struct dma_buf *buf)
 362 {
 363         drm_gem_dmabuf_release(buf);
 364 }
 365
 366 static void *tegra_gem_prime_kmap_atomic(struct dma_buf *buf,
 367                                          unsigned long page)
 368 {
 369         return NULL;
 370 }
 371
 372 static void tegra_gem_prime_kunmap_atomic(struct dma_buf *buf,
 373                                           unsigned long page,
 374                                           void *addr)
 375 {
 376 }
 377
 378 static void *tegra_gem_prime_kmap(struct dma_buf *buf, unsigned long page)
 379 {
 380         return NULL;
 381 }
 382
 383 static void tegra_gem_prime_kunmap(struct dma_buf *buf, unsigned long page,
 384                                    void *addr)
 385 {
 386 }
 387
 388 static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
 389 {
 390         return -EINVAL;
 391 }
 392
 393 static void *tegra_gem_prime_vmap(struct dma_buf *buf)
 394 {
 395         struct drm_gem_object *gem = buf->priv;
 396         struct tegra_bo *bo = to_tegra_bo(gem);
 397
 398         return bo->vaddr;
 399 }
 400
 401 static void tegra_gem_prime_vunmap(struct dma_buf *buf, void *vaddr)
 402 {
 403 }
 404
 405 static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = {
 406         .map_dma_buf = tegra_gem_prime_map_dma_buf,
 407         .unmap_dma_buf = tegra_gem_prime_unmap_dma_buf,
 408         .release = tegra_gem_prime_release,
 409         .kmap_atomic = tegra_gem_prime_kmap_atomic,
 410         .kunmap_atomic = tegra_gem_prime_kunmap_atomic,
 411         .kmap = tegra_gem_prime_kmap,
 412         .kunmap = tegra_gem_prime_kunmap,
 413         .mmap = tegra_gem_prime_mmap,
 414         .vmap = tegra_gem_prime_vmap,
 415         .vunmap = tegra_gem_prime_vunmap,
 416 };
 417
 418 struct dma_buf *tegra_gem_prime_export(struct drm_device *drm,
 419                                        struct drm_gem_object *gem,
 420                                        int flags)
 421 {
 422         return dma_buf_export(gem, &tegra_gem_prime_dmabuf_ops, gem->size,
 423                               flags);
 424 }
 425
 426 struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm,
 427                                               struct dma_buf *buf)
 428 {
 429         struct tegra_bo *bo;
 430
 431         if (buf->ops == &tegra_gem_prime_dmabuf_ops) {
 432                 struct drm_gem_object *gem = buf->priv;
 433
 434                 if (gem->dev == drm) {
 435                         drm_gem_object_reference(gem);
 436                         return gem;
 437                 }
 438         }
 439
 440         bo = tegra_bo_import(drm, buf);
 441         if (IS_ERR(bo))
 442                 return ERR_CAST(bo);
 443
 444         return &bo->gem;
 445 }