LXR linux/drivers/gpu/drm/nouveau/nouveau

   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
  30struct sg_table *nouveau_gem_prime_get_sg_table(struct drm_gem_object *obj)
  31{
  32        struct nouveau_bo *nvbo = nouveau_gem_object(obj);
  33
  34        return drm_prime_pages_to_sg(obj->dev, nvbo->bo.ttm->pages,
  35                                     nvbo->bo.ttm->num_pages);
  36}
  37
  38struct 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
  81unlock:
  82        dma_resv_unlock(robj);
  83        return obj;
  84}
  85
  86int 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        ret = ttm_bo_reserve(&nvbo->bo, false, false, NULL);
  97        if (ret)
  98                goto error;
  99
 100        if (nvbo->bo.moving)
 101                ret = dma_fence_wait(nvbo->bo.moving, true);
 102
 103        ttm_bo_unreserve(&nvbo->bo);
 104        if (ret)
 105                goto error;
 106
 107        return ret;
 108
 109error:
 110        nouveau_bo_unpin(nvbo);
 111        return ret;
 112}
 113
 114void nouveau_gem_prime_unpin(struct drm_gem_object *obj)
 115{
 116        struct nouveau_bo *nvbo = nouveau_gem_object(obj);
 117
 118        nouveau_bo_unpin(nvbo);
 119}
 120