drivers/gpu/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
  27 #include <linux/dma-buf.h>
  28
  29 #include <drm/drm_prime.h>
  30 #include <drm/radeon_drm.h>
  31
  32 #include "radeon.h"
  33
  34 struct sg_table *radeon_gem_prime_get_sg_table(struct drm_gem_object *obj)
  35 {
  36         struct radeon_bo *bo = gem_to_radeon_bo(obj);
  37         int npages = bo->tbo.num_pages;
  38
  39         return drm_prime_pages_to_sg(bo->tbo.ttm->pages, npages);
  40 }
  41
  42 void *radeon_gem_prime_vmap(struct drm_gem_object *obj)
  43 {
  44         struct radeon_bo *bo = gem_to_radeon_bo(obj);
  45         int ret;
  46
  47         ret = ttm_bo_kmap(&bo->tbo, 0, bo->tbo.num_pages,
  48                           &bo->dma_buf_vmap);
  49         if (ret)
  50                 return ERR_PTR(ret);
  51
  52         return bo->dma_buf_vmap.virtual;
  53 }
  54
  55 void radeon_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
  56 {
  57         struct radeon_bo *bo = gem_to_radeon_bo(obj);
  58
  59         ttm_bo_kunmap(&bo->dma_buf_vmap);
  60 }
  61
  62 struct drm_gem_object *radeon_gem_prime_import_sg_table(struct drm_device *dev,
  63                                                         struct dma_buf_attachment *attach,
  64                                                         struct sg_table *sg)
  65 {
  66         struct dma_resv *resv = attach->dmabuf->resv;
  67         struct radeon_device *rdev = dev->dev_private;
  68         struct radeon_bo *bo;
  69         int ret;
  70
  71         dma_resv_lock(resv, NULL);
  72         ret = radeon_bo_create(rdev, attach->dmabuf->size, PAGE_SIZE, false,
  73                                RADEON_GEM_DOMAIN_GTT, 0, sg, resv, &bo);
  74         dma_resv_unlock(resv);
  75         if (ret)
  76                 return ERR_PTR(ret);
  77
  78         mutex_lock(&rdev->gem.mutex);
  79         list_add_tail(&bo->list, &rdev->gem.objects);
  80         mutex_unlock(&rdev->gem.mutex);
  81
  82         bo->prime_shared_count = 1;
  83         return &bo->tbo.base;
  84 }
  85
  86 int radeon_gem_prime_pin(struct drm_gem_object *obj)
  87 {
  88         struct radeon_bo *bo = gem_to_radeon_bo(obj);
  89         int ret = 0;
  90
  91         ret = radeon_bo_reserve(bo, false);
  92         if (unlikely(ret != 0))
  93                 return ret;
  94
  95         /* pin buffer into GTT */
  96         ret = radeon_bo_pin(bo, RADEON_GEM_DOMAIN_GTT, NULL);
  97         if (likely(ret == 0))
  98                 bo->prime_shared_count++;
  99
 100         radeon_bo_unreserve(bo);
 101         return ret;
 102 }
 103
 104 void radeon_gem_prime_unpin(struct drm_gem_object *obj)
 105 {
 106         struct radeon_bo *bo = gem_to_radeon_bo(obj);
 107         int ret = 0;
 108
 109         ret = radeon_bo_reserve(bo, false);
 110         if (unlikely(ret != 0))
 111                 return;
 112
 113         radeon_bo_unpin(bo);
 114         if (bo->prime_shared_count)
 115                 bo->prime_shared_count--;
 116         radeon_bo_unreserve(bo);
 117 }
 118
 119
 120 struct dma_buf *radeon_gem_prime_export(struct drm_gem_object *gobj,
 121                                         int flags)
 122 {
 123         struct radeon_bo *bo = gem_to_radeon_bo(gobj);
 124         if (radeon_ttm_tt_has_userptr(bo->tbo.ttm))
 125                 return ERR_PTR(-EPERM);
 126         return drm_gem_prime_export(gobj, flags);
 127 }