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