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}