drivers/gpu/drm/vgem/vgem_dma_buf.c

   1 /*
   2  * Copyright © 2012 Intel Corporation
   3  * Copyright © 2014 The Chromium OS Authors
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  22  * IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *    Ben Widawsky <ben@bwidawsk.net>
  26  *
  27  */
  28
  29 #include <linux/dma-buf.h>
  30 #include "vgem_drv.h"
  31
  32 struct sg_table *vgem_gem_prime_get_sg_table(struct drm_gem_object *gobj)
  33 {
  34         struct drm_vgem_gem_object *obj = to_vgem_bo(gobj);
  35         BUG_ON(obj->pages == NULL);
  36
  37         return drm_prime_pages_to_sg(obj->pages, obj->base.size / PAGE_SIZE);
  38 }
  39
  40 int vgem_gem_prime_pin(struct drm_gem_object *gobj)
  41 {
  42         struct drm_vgem_gem_object *obj = to_vgem_bo(gobj);
  43         return vgem_gem_get_pages(obj);
  44 }
  45
  46 void vgem_gem_prime_unpin(struct drm_gem_object *gobj)
  47 {
  48         struct drm_vgem_gem_object *obj = to_vgem_bo(gobj);
  49         vgem_gem_put_pages(obj);
  50 }
  51
  52 void *vgem_gem_prime_vmap(struct drm_gem_object *gobj)
  53 {
  54         struct drm_vgem_gem_object *obj = to_vgem_bo(gobj);
  55         BUG_ON(obj->pages == NULL);
  56
  57         return vmap(obj->pages, obj->base.size / PAGE_SIZE, 0, PAGE_KERNEL);
  58 }
  59
  60 void vgem_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
  61 {
  62         vunmap(vaddr);
  63 }
  64
  65 struct drm_gem_object *vgem_gem_prime_import(struct drm_device *dev,
  66                                              struct dma_buf *dma_buf)
  67 {
  68         struct drm_vgem_gem_object *obj = NULL;
  69         int ret;
  70
  71         obj = kzalloc(sizeof(*obj), GFP_KERNEL);
  72         if (obj == NULL) {
  73                 ret = -ENOMEM;
  74                 goto fail;
  75         }
  76
  77         ret = drm_gem_object_init(dev, &obj->base, dma_buf->size);
  78         if (ret) {
  79                 ret = -ENOMEM;
  80                 goto fail_free;
  81         }
  82
  83         get_dma_buf(dma_buf);
  84
  85         obj->base.dma_buf = dma_buf;
  86         obj->use_dma_buf = true;
  87
  88         return &obj->base;
  89
  90 fail_free:
  91         kfree(obj);
  92 fail:
  93         return ERR_PTR(ret);
  94 }