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(nvbo->bo.ttm->pages, npages);
  36 }
  37
  38 void *nouveau_gem_prime_vmap(struct drm_gem_object *obj)
  39 {
  40         struct nouveau_bo *nvbo = nouveau_gem_object(obj);
  41         int ret;
  42
  43         ret = ttm_bo_kmap(&nvbo->bo, 0, nvbo->bo.num_pages,
  44                           &nvbo->dma_buf_vmap);
  45         if (ret)
  46                 return ERR_PTR(ret);
  47
  48         return nvbo->dma_buf_vmap.virtual;
  49 }
  50
  51 void nouveau_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
  52 {
  53         struct nouveau_bo *nvbo = nouveau_gem_object(obj);
  54
  55         ttm_bo_kunmap(&nvbo->dma_buf_vmap);
  56 }
  57
  58 struct drm_gem_object *nouveau_gem_prime_import_sg_table(struct drm_device *dev,
  59                                                          struct dma_buf_attachment *attach,
  60                                                          struct sg_table *sg)
  61 {
  62         struct nouveau_drm *drm = nouveau_drm(dev);
  63         struct drm_gem_object *obj;
  64         struct nouveau_bo *nvbo;
  65         struct dma_resv *robj = attach->dmabuf->resv;
  66         u64 size = attach->dmabuf->size;
  67         u32 flags = 0;
  68         int align = 0;
  69         int ret;
  70
  71         flags = TTM_PL_FLAG_TT;
  72
  73         dma_resv_lock(robj, NULL);
  74         nvbo = nouveau_bo_alloc(&drm->client, &size, &align, flags, 0, 0);
  75         if (IS_ERR(nvbo)) {
  76                 obj = ERR_CAST(nvbo);
  77                 goto unlock;
  78         }
  79
  80         nvbo->valid_domains = NOUVEAU_GEM_DOMAIN_GART;
  81
  82         /* Initialize the embedded gem-object. We return a single gem-reference
  83          * to the caller, instead of a normal nouveau_bo ttm reference. */
  84         ret = drm_gem_object_init(dev, &nvbo->bo.base, size);
  85         if (ret) {
  86                 nouveau_bo_ref(NULL, &nvbo);
  87                 obj = ERR_PTR(-ENOMEM);
  88                 goto unlock;
  89         }
  90
  91         ret = nouveau_bo_init(nvbo, size, align, flags, sg, robj);
  92         if (ret) {
  93                 nouveau_bo_ref(NULL, &nvbo);
  94                 obj = ERR_PTR(ret);
  95                 goto unlock;
  96         }
  97
  98         obj = &nvbo->bo.base;
  99
 100 unlock:
 101         dma_resv_unlock(robj);
 102         return obj;
 103 }
 104
 105 int nouveau_gem_prime_pin(struct drm_gem_object *obj)
 106 {
 107         struct nouveau_bo *nvbo = nouveau_gem_object(obj);
 108         int ret;
 109
 110         /* pin buffer into GTT */
 111         ret = nouveau_bo_pin(nvbo, TTM_PL_FLAG_TT, false);
 112         if (ret)
 113                 return -EINVAL;
 114
 115         return 0;
 116 }
 117
 118 void nouveau_gem_prime_unpin(struct drm_gem_object *obj)
 119 {
 120         struct nouveau_bo *nvbo = nouveau_gem_object(obj);
 121
 122         nouveau_bo_unpin(nvbo);
 123 }