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 #include "radeon_prime.h"
  34
  35 struct sg_table *radeon_gem_prime_get_sg_table(struct drm_gem_object *obj)
  36 {
  37         struct radeon_bo *bo = gem_to_radeon_bo(obj);
  38         int npages = bo->tbo.num_pages;
  39
  40         return drm_prime_pages_to_sg(obj->dev, bo->tbo.ttm->pages, npages);
  41 }
  42
  43 struct drm_gem_object *radeon_gem_prime_import_sg_table(struct drm_device *dev,
  44                                                         struct dma_buf_attachment *attach,
  45                                                         struct sg_table *sg)
  46 {
  47         struct dma_resv *resv = attach->dmabuf->resv;
  48         struct radeon_device *rdev = dev->dev_private;
  49         struct radeon_bo *bo;
  50         int ret;
  51
  52         dma_resv_lock(resv, NULL);
  53         ret = radeon_bo_create(rdev, attach->dmabuf->size, PAGE_SIZE, false,
  54                                RADEON_GEM_DOMAIN_GTT, 0, sg, resv, &bo);
  55         dma_resv_unlock(resv);
  56         if (ret)
  57                 return ERR_PTR(ret);
  58
  59         mutex_lock(&rdev->gem.mutex);
  60         list_add_tail(&bo->list, &rdev->gem.objects);
  61         mutex_unlock(&rdev->gem.mutex);
  62
  63         bo->prime_shared_count = 1;
  64         return &bo->tbo.base;
  65 }
  66
  67 int radeon_gem_prime_pin(struct drm_gem_object *obj)
  68 {
  69         struct radeon_bo *bo = gem_to_radeon_bo(obj);
  70         int ret = 0;
  71
  72         ret = radeon_bo_reserve(bo, false);
  73         if (unlikely(ret != 0))
  74                 return ret;
  75
  76         /* pin buffer into GTT */
  77         ret = radeon_bo_pin(bo, RADEON_GEM_DOMAIN_GTT, NULL);
  78         if (likely(ret == 0))
  79                 bo->prime_shared_count++;
  80
  81         radeon_bo_unreserve(bo);
  82         return ret;
  83 }
  84
  85 void radeon_gem_prime_unpin(struct drm_gem_object *obj)
  86 {
  87         struct radeon_bo *bo = gem_to_radeon_bo(obj);
  88         int ret = 0;
  89
  90         ret = radeon_bo_reserve(bo, false);
  91         if (unlikely(ret != 0))
  92                 return;
  93
  94         radeon_bo_unpin(bo);
  95         if (bo->prime_shared_count)
  96                 bo->prime_shared_count--;
  97         radeon_bo_unreserve(bo);
  98 }
  99
 100
 101 struct dma_buf *radeon_gem_prime_export(struct drm_gem_object *gobj,
 102                                         int flags)
 103 {
 104         struct radeon_bo *bo = gem_to_radeon_bo(gobj);
 105         if (radeon_ttm_tt_has_userptr(bo->rdev, bo->tbo.ttm))
 106                 return ERR_PTR(-EPERM);
 107         return drm_gem_prime_export(gobj, flags);
 108 }