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