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
 34struct 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
 42void *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
 55void 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
 62struct 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
 86int 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
104void 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
120struct 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}