2 * Copyright 2012 Advanced Micro Devices, Inc.
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:
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
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.
22 * based on nouveau_prime.c
24 * Authors: Alex Deucher
30 #include "radeon_drm.h"
32 #include <linux/dma-buf.h>
34 static struct sg_table *radeon_gem_map_dma_buf(struct dma_buf_attachment *attachment,
35 enum dma_data_direction dir)
37 struct radeon_bo *bo = attachment->dmabuf->priv;
38 struct drm_device *dev = bo->rdev->ddev;
39 int npages = bo->tbo.num_pages;
43 mutex_lock(&dev->struct_mutex);
44 sg = drm_prime_pages_to_sg(bo->tbo.ttm->pages, npages);
45 nents = dma_map_sg(attachment->dev, sg->sgl, sg->nents, dir);
46 mutex_unlock(&dev->struct_mutex);
50 static void radeon_gem_unmap_dma_buf(struct dma_buf_attachment *attachment,
51 struct sg_table *sg, enum dma_data_direction dir)
53 dma_unmap_sg(attachment->dev, sg->sgl, sg->nents, dir);
58 static void radeon_gem_dmabuf_release(struct dma_buf *dma_buf)
60 struct radeon_bo *bo = dma_buf->priv;
62 if (bo->gem_base.export_dma_buf == dma_buf) {
63 DRM_ERROR("unreference dmabuf %p\n", &bo->gem_base);
64 bo->gem_base.export_dma_buf = NULL;
65 drm_gem_object_unreference_unlocked(&bo->gem_base);
69 static void *radeon_gem_kmap_atomic(struct dma_buf *dma_buf, unsigned long page_num)
74 static void radeon_gem_kunmap_atomic(struct dma_buf *dma_buf, unsigned long page_num, void *addr)
78 static void *radeon_gem_kmap(struct dma_buf *dma_buf, unsigned long page_num)
83 static void radeon_gem_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr)
88 const static struct dma_buf_ops radeon_dmabuf_ops = {
89 .map_dma_buf = radeon_gem_map_dma_buf,
90 .unmap_dma_buf = radeon_gem_unmap_dma_buf,
91 .release = radeon_gem_dmabuf_release,
92 .kmap = radeon_gem_kmap,
93 .kmap_atomic = radeon_gem_kmap_atomic,
94 .kunmap = radeon_gem_kunmap,
95 .kunmap_atomic = radeon_gem_kunmap_atomic,
98 static int radeon_prime_create(struct drm_device *dev,
101 struct radeon_bo **pbo)
103 struct radeon_device *rdev = dev->dev_private;
104 struct radeon_bo *bo;
107 ret = radeon_bo_create(rdev, size, PAGE_SIZE, false,
108 RADEON_GEM_DOMAIN_GTT, sg, pbo);
112 bo->gem_base.driver_private = bo;
114 mutex_lock(&rdev->gem.mutex);
115 list_add_tail(&bo->list, &rdev->gem.objects);
116 mutex_unlock(&rdev->gem.mutex);
121 struct dma_buf *radeon_gem_prime_export(struct drm_device *dev,
122 struct drm_gem_object *obj,
125 struct radeon_bo *bo = gem_to_radeon_bo(obj);
128 /* pin buffer into GTT */
129 ret = radeon_bo_pin(bo, RADEON_GEM_DOMAIN_GTT, NULL);
133 return dma_buf_export(bo, &radeon_dmabuf_ops, obj->size, flags);
136 struct drm_gem_object *radeon_gem_prime_import(struct drm_device *dev,
137 struct dma_buf *dma_buf)
139 struct dma_buf_attachment *attach;
141 struct radeon_bo *bo;
144 if (dma_buf->ops == &radeon_dmabuf_ops) {
146 if (bo->gem_base.dev == dev) {
147 drm_gem_object_reference(&bo->gem_base);
148 return &bo->gem_base;
153 attach = dma_buf_attach(dma_buf, dev->dev);
155 return ERR_CAST(attach);
157 sg = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
163 ret = radeon_prime_create(dev, dma_buf->size, sg, &bo);
167 bo->gem_base.import_attach = attach;
169 return &bo->gem_base;
172 dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL);
174 dma_buf_detach(dma_buf, attach);