sys/dev/drm/radeon/radeon_prime.c

   1 /*
   2  * Copyright 2012 Advanced Micro Devices, 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  * based on nouveau_prime.c
  23  *
  24  * Authors: Alex Deucher
  25  */
  26 #include <drm/drmP.h>
  27
  28 #include "radeon.h"
  29 #include <drm/radeon_drm.h>
  30 #include <linux/dma-buf.h>
  31
  32 struct sg_table *radeon_gem_prime_get_sg_table(struct drm_gem_object *obj);
  33 void *radeon_gem_prime_vmap(struct drm_gem_object *obj);
  34 void radeon_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr);
  35 struct drm_gem_object *radeon_gem_prime_import_sg_table(struct drm_device *dev,
  36                                                         struct dma_buf_attachment *attach,
  37                                                         struct sg_table *sg);
  38 int radeon_gem_prime_pin(struct drm_gem_object *obj);
  39 void radeon_gem_prime_unpin(struct drm_gem_object *obj);
  40 struct reservation_object *radeon_gem_prime_res_obj(struct drm_gem_object *obj);
  41 struct dma_buf *radeon_gem_prime_export(struct drm_device *dev,
  42                                         struct drm_gem_object *gobj,
  43                                         int flags);
  44
  45 struct sg_table *radeon_gem_prime_get_sg_table(struct drm_gem_object *obj)
  46 {
  47         struct radeon_bo *bo = gem_to_radeon_bo(obj);
  48         int npages = bo->tbo.num_pages;
  49
  50         return drm_prime_pages_to_sg(bo->tbo.ttm->pages, npages);
  51 }
  52
  53 void *radeon_gem_prime_vmap(struct drm_gem_object *obj)
  54 {
  55         struct radeon_bo *bo = gem_to_radeon_bo(obj);
  56         int ret;
  57
  58         ret = ttm_bo_kmap(&bo->tbo, 0, bo->tbo.num_pages,
  59                           &bo->dma_buf_vmap);
  60         if (ret)
  61                 return ERR_PTR(ret);
  62
  63         return bo->dma_buf_vmap.virtual;
  64 }
  65
  66 void radeon_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
  67 {
  68         struct radeon_bo *bo = gem_to_radeon_bo(obj);
  69
  70         ttm_bo_kunmap(&bo->dma_buf_vmap);
  71 }
  72
  73 struct drm_gem_object *radeon_gem_prime_import_sg_table(struct drm_device *dev,
  74                                                         struct dma_buf_attachment *attach,
  75                                                         struct sg_table *sg)
  76 {
  77         struct reservation_object *resv = attach->dmabuf->resv;
  78         struct radeon_device *rdev = dev->dev_private;
  79         struct radeon_bo *bo;
  80         int ret;
  81
  82         ww_mutex_lock(&resv->lock, NULL);
  83         ret = radeon_bo_create(rdev, attach->dmabuf->size, PAGE_SIZE, false,
  84                                RADEON_GEM_DOMAIN_GTT, 0, sg, resv, &bo);
  85         ww_mutex_unlock(&resv->lock);
  86         if (ret)
  87                 return ERR_PTR(ret);
  88
  89         mutex_lock(&rdev->gem.mutex);
  90         list_add_tail(&bo->list, &rdev->gem.objects);
  91         mutex_unlock(&rdev->gem.mutex);
  92
  93         bo->prime_shared_count = 1;
  94         return &bo->gem_base;
  95 }
  96
  97 int radeon_gem_prime_pin(struct drm_gem_object *obj)
  98 {
  99         struct radeon_bo *bo = gem_to_radeon_bo(obj);
 100         int ret = 0;
 101
 102         ret = radeon_bo_reserve(bo, false);
 103         if (unlikely(ret != 0))
 104                 return ret;
 105
 106         /* pin buffer into GTT */
 107         ret = radeon_bo_pin(bo, RADEON_GEM_DOMAIN_GTT, NULL);
 108         if (likely(ret == 0))
 109                 bo->prime_shared_count++;
 110
 111         radeon_bo_unreserve(bo);
 112         return ret;
 113 }
 114
 115 void radeon_gem_prime_unpin(struct drm_gem_object *obj)
 116 {
 117         struct radeon_bo *bo = gem_to_radeon_bo(obj);
 118         int ret = 0;
 119
 120         ret = radeon_bo_reserve(bo, false);
 121         if (unlikely(ret != 0))
 122                 return;
 123
 124         radeon_bo_unpin(bo);
 125         if (bo->prime_shared_count)
 126                 bo->prime_shared_count--;
 127         radeon_bo_unreserve(bo);
 128 }
 129
 130
 131 struct reservation_object *radeon_gem_prime_res_obj(struct drm_gem_object *obj)
 132 {
 133         struct radeon_bo *bo = gem_to_radeon_bo(obj);
 134
 135         return bo->tbo.resv;
 136 }
 137
 138 struct dma_buf *radeon_gem_prime_export(struct drm_device *dev,
 139                                         struct drm_gem_object *gobj,
 140                                         int flags)
 141 {
 142         struct radeon_bo *bo = gem_to_radeon_bo(gobj);
 143         if (radeon_ttm_tt_has_userptr(bo->tbo.ttm))
 144                 return ERR_PTR(-EPERM);
 145         return drm_gem_prime_export(dev, gobj, flags);
 146 }