LXR linux/drivers/gpu/drm/radeon/radeon

   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
  35struct 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
  39        return drm_prime_pages_to_sg(obj->dev, bo->tbo.ttm->pages,
  40                                     bo->tbo.ttm->num_pages);
  41}
  42
  43struct 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        bo->tbo.base.funcs = &radeon_gem_object_funcs;
  60
  61        mutex_lock(&rdev->gem.mutex);
  62        list_add_tail(&bo->list, &rdev->gem.objects);
  63        mutex_unlock(&rdev->gem.mutex);
  64
  65        bo->prime_shared_count = 1;
  66        return &bo->tbo.base;
  67}
  68
  69int radeon_gem_prime_pin(struct drm_gem_object *obj)
  70{
  71        struct radeon_bo *bo = gem_to_radeon_bo(obj);
  72        int ret = 0;
  73
  74        ret = radeon_bo_reserve(bo, false);
  75        if (unlikely(ret != 0))
  76                return ret;
  77
  78        /* pin buffer into GTT */
  79        ret = radeon_bo_pin(bo, RADEON_GEM_DOMAIN_GTT, NULL);
  80        if (unlikely(ret))
  81                goto error;
  82
  83        if (bo->tbo.moving) {
  84                ret = dma_fence_wait(bo->tbo.moving, false);
  85                if (unlikely(ret)) {
  86                        radeon_bo_unpin(bo);
  87                        goto error;
  88                }
  89        }
  90
  91        bo->prime_shared_count++;
  92error:
  93        radeon_bo_unreserve(bo);
  94        return ret;
  95}
  96
  97void radeon_gem_prime_unpin(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;
 105
 106        radeon_bo_unpin(bo);
 107        if (bo->prime_shared_count)
 108                bo->prime_shared_count--;
 109        radeon_bo_unreserve(bo);
 110}
 111
 112
 113struct dma_buf *radeon_gem_prime_export(struct drm_gem_object *gobj,
 114                                        int flags)
 115{
 116        struct radeon_bo *bo = gem_to_radeon_bo(gobj);
 117        if (radeon_ttm_tt_has_userptr(bo->rdev, bo->tbo.ttm))
 118                return ERR_PTR(-EPERM);
 119        return drm_gem_prime_export(gobj, flags);
 120}
 121