drivers/gpu/drm/nouveau/nouveau_prime.c

   1 /*
   2  * Copyright 2011 Red Hat Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  * Authors: Dave Airlie
  23  */
  24
  25 #include <linux/dma-buf.h>
  26
  27 #include "nouveau_drv.h"
  28 #include "nouveau_gem.h"
  29
  30 struct sg_table *nouveau_gem_prime_get_sg_table(struct drm_gem_object *obj)
  31 {
  32         struct nouveau_bo *nvbo = nouveau_gem_object(obj);
  33         int npages = nvbo->bo.num_pages;
  34
  35         return drm_prime_pages_to_sg(obj->dev, nvbo->bo.ttm->pages, npages);
  36 }
  37
  38 struct drm_gem_object *nouveau_gem_prime_import_sg_table(struct drm_device *dev,
  39                                                          struct dma_buf_attachment *attach,
  40                                                          struct sg_table *sg)
  41 {
  42         struct nouveau_drm *drm = nouveau_drm(dev);
  43         struct drm_gem_object *obj;
  44         struct nouveau_bo *nvbo;
  45         struct dma_resv *robj = attach->dmabuf->resv;
  46         u64 size = attach->dmabuf->size;
  47         int align = 0;
  48         int ret;
  49
  50         dma_resv_lock(robj, NULL);
  51         nvbo = nouveau_bo_alloc(&drm->client, &size, &align,
  52                                 NOUVEAU_GEM_DOMAIN_GART, 0, 0);
  53         if (IS_ERR(nvbo)) {
  54                 obj = ERR_CAST(nvbo);
  55                 goto unlock;
  56         }
  57
  58         nvbo->valid_domains = NOUVEAU_GEM_DOMAIN_GART;
  59
  60         nvbo->bo.base.funcs = &nouveau_gem_object_funcs;
  61
  62         /* Initialize the embedded gem-object. We return a single gem-reference
  63          * to the caller, instead of a normal nouveau_bo ttm reference. */
  64         ret = drm_gem_object_init(dev, &nvbo->bo.base, size);
  65         if (ret) {
  66                 nouveau_bo_ref(NULL, &nvbo);
  67                 obj = ERR_PTR(-ENOMEM);
  68                 goto unlock;
  69         }
  70
  71         ret = nouveau_bo_init(nvbo, size, align, NOUVEAU_GEM_DOMAIN_GART,
  72                               sg, robj);
  73         if (ret) {
  74                 nouveau_bo_ref(NULL, &nvbo);
  75                 obj = ERR_PTR(ret);
  76                 goto unlock;
  77         }
  78
  79         obj = &nvbo->bo.base;
  80
  81 unlock:
  82         dma_resv_unlock(robj);
  83         return obj;
  84 }
  85
  86 int nouveau_gem_prime_pin(struct drm_gem_object *obj)
  87 {
  88         struct nouveau_bo *nvbo = nouveau_gem_object(obj);
  89         int ret;
  90
  91         /* pin buffer into GTT */
  92         ret = nouveau_bo_pin(nvbo, NOUVEAU_GEM_DOMAIN_GART, false);
  93         if (ret)
  94                 return -EINVAL;
  95
  96         return 0;
  97 }
  98
  99 void nouveau_gem_prime_unpin(struct drm_gem_object *obj)
 100 {
 101         struct nouveau_bo *nvbo = nouveau_gem_object(obj);
 102
 103         nouveau_bo_unpin(nvbo);
 104 }