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#include <drm/drmP.h>
 27
 28#include "amdgpu.h"
 29#include <drm/amdgpu_drm.h>
 30#include <linux/dma-buf.h>
 31
 32struct sg_table *amdgpu_gem_prime_get_sg_table(struct drm_gem_object *obj)
 33{
 34	struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj);
 35	int npages = bo->tbo.num_pages;
 36
 37	return drm_prime_pages_to_sg(bo->tbo.ttm->pages, npages);
 38}
 39
 40void *amdgpu_gem_prime_vmap(struct drm_gem_object *obj)
 41{
 42	struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj);
 43	int ret;
 44
 45	ret = ttm_bo_kmap(&bo->tbo, 0, bo->tbo.num_pages,
 46			  &bo->dma_buf_vmap);
 47	if (ret)
 48		return ERR_PTR(ret);
 49
 50	return bo->dma_buf_vmap.virtual;
 51}
 52
 53void amdgpu_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
 54{
 55	struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj);
 56
 57	ttm_bo_kunmap(&bo->dma_buf_vmap);
 58}
 59
 60struct drm_gem_object *
 61amdgpu_gem_prime_import_sg_table(struct drm_device *dev,
 62				 struct dma_buf_attachment *attach,
 63				 struct sg_table *sg)
 64{
 65	struct reservation_object *resv = attach->dmabuf->resv;
 66	struct amdgpu_device *adev = dev->dev_private;
 67	struct amdgpu_bo *bo;
 68	int ret;
 69
 70	ww_mutex_lock(&resv->lock, NULL);
 71	ret = amdgpu_bo_create(adev, attach->dmabuf->size, PAGE_SIZE, false,
 72			       AMDGPU_GEM_DOMAIN_GTT, 0, sg, resv, &bo);
 73	ww_mutex_unlock(&resv->lock);
 74	if (ret)
 75		return ERR_PTR(ret);
 76
 77	bo->prime_shared_count = 1;
 78	return &bo->gem_base;
 79}
 80
 81int amdgpu_gem_prime_pin(struct drm_gem_object *obj)
 82{
 83	struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj);
 84	long ret = 0;
 85
 86	ret = amdgpu_bo_reserve(bo, false);
 87	if (unlikely(ret != 0))
 88		return ret;
 89
 90	/*
 91	 * Wait for all shared fences to complete before we switch to future
 92	 * use of exclusive fence on this prime shared bo.
 93	 */
 94	ret = reservation_object_wait_timeout_rcu(bo->tbo.resv, true, false,
 95						  MAX_SCHEDULE_TIMEOUT);
 96	if (unlikely(ret < 0)) {
 97		DRM_DEBUG_PRIME("Fence wait failed: %li\n", ret);
 98		amdgpu_bo_unreserve(bo);
 99		return ret;
100	}
101
102	/* pin buffer into GTT */
103	ret = amdgpu_bo_pin(bo, AMDGPU_GEM_DOMAIN_GTT, NULL);
104	if (likely(ret == 0))
105		bo->prime_shared_count++;
106
107	amdgpu_bo_unreserve(bo);
108	return ret;
109}
110
111void amdgpu_gem_prime_unpin(struct drm_gem_object *obj)
112{
113	struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj);
114	int ret = 0;
115
116	ret = amdgpu_bo_reserve(bo, false);
117	if (unlikely(ret != 0))
118		return;
119
120	amdgpu_bo_unpin(bo);
121	if (bo->prime_shared_count)
122		bo->prime_shared_count--;
123	amdgpu_bo_unreserve(bo);
124}
125
126struct reservation_object *amdgpu_gem_prime_res_obj(struct drm_gem_object *obj)
127{
128	struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj);
129
130	return bo->tbo.resv;
131}
132
133struct dma_buf *amdgpu_gem_prime_export(struct drm_device *dev,
134					struct drm_gem_object *gobj,
135					int flags)
136{
137	struct amdgpu_bo *bo = gem_to_amdgpu_bo(gobj);
138
139	if (amdgpu_ttm_tt_get_usermm(bo->tbo.ttm))
140		return ERR_PTR(-EPERM);
141
142	return drm_gem_prime_export(dev, gobj, flags);
143}