2 * Copyright 2012 Red Hat 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 (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
24 * Dave Airlie <airlied@redhat.com>
28 #include <linux/dma-buf.h>
30 static struct sg_table
*i915_gem_map_dma_buf(struct dma_buf_attachment
*attachment
,
31 enum dma_data_direction dir
)
33 struct drm_i915_gem_object
*obj
= attachment
->dmabuf
->priv
;
34 struct drm_device
*dev
= obj
->base
.dev
;
35 int npages
= obj
->base
.size
/ PAGE_SIZE
;
36 struct sg_table
*sg
= NULL
;
40 ret
= i915_mutex_lock_interruptible(dev
);
45 ret
= i915_gem_object_get_pages_gtt(obj
, __GFP_NORETRY
| __GFP_NOWARN
);
50 /* link the pages into an SG then map the sg */
51 sg
= drm_prime_pages_to_sg(obj
->pages
, npages
);
52 nents
= dma_map_sg(attachment
->dev
, sg
->sgl
, sg
->nents
, dir
);
54 mutex_unlock(&dev
->struct_mutex
);
58 static void i915_gem_unmap_dma_buf(struct dma_buf_attachment
*attachment
,
59 struct sg_table
*sg
, enum dma_data_direction dir
)
61 dma_unmap_sg(attachment
->dev
, sg
->sgl
, sg
->nents
, dir
);
66 static void i915_gem_dmabuf_release(struct dma_buf
*dma_buf
)
68 struct drm_i915_gem_object
*obj
= dma_buf
->priv
;
70 if (obj
->base
.export_dma_buf
== dma_buf
) {
71 /* drop the reference on the export fd holds */
72 obj
->base
.export_dma_buf
= NULL
;
73 drm_gem_object_unreference_unlocked(&obj
->base
);
77 static void *i915_gem_dmabuf_kmap_atomic(struct dma_buf
*dma_buf
, unsigned long page_num
)
82 static void i915_gem_dmabuf_kunmap_atomic(struct dma_buf
*dma_buf
, unsigned long page_num
, void *addr
)
86 static void *i915_gem_dmabuf_kmap(struct dma_buf
*dma_buf
, unsigned long page_num
)
91 static void i915_gem_dmabuf_kunmap(struct dma_buf
*dma_buf
, unsigned long page_num
, void *addr
)
96 static const struct dma_buf_ops i915_dmabuf_ops
= {
97 .map_dma_buf
= i915_gem_map_dma_buf
,
98 .unmap_dma_buf
= i915_gem_unmap_dma_buf
,
99 .release
= i915_gem_dmabuf_release
,
100 .kmap
= i915_gem_dmabuf_kmap
,
101 .kmap_atomic
= i915_gem_dmabuf_kmap_atomic
,
102 .kunmap
= i915_gem_dmabuf_kunmap
,
103 .kunmap_atomic
= i915_gem_dmabuf_kunmap_atomic
,
106 struct dma_buf
*i915_gem_prime_export(struct drm_device
*dev
,
107 struct drm_gem_object
*gem_obj
, int flags
)
109 struct drm_i915_gem_object
*obj
= to_intel_bo(gem_obj
);
111 return dma_buf_export(obj
, &i915_dmabuf_ops
,
112 obj
->base
.size
, 0600);
115 struct drm_gem_object
*i915_gem_prime_import(struct drm_device
*dev
,
116 struct dma_buf
*dma_buf
)
118 struct dma_buf_attachment
*attach
;
120 struct drm_i915_gem_object
*obj
;
125 /* is this one of own objects? */
126 if (dma_buf
->ops
== &i915_dmabuf_ops
) {
128 /* is it from our device? */
129 if (obj
->base
.dev
== dev
) {
130 drm_gem_object_reference(&obj
->base
);
136 attach
= dma_buf_attach(dma_buf
, dev
->dev
);
138 return ERR_CAST(attach
);
140 sg
= dma_buf_map_attachment(attach
, DMA_BIDIRECTIONAL
);
146 size
= dma_buf
->size
;
147 npages
= size
/ PAGE_SIZE
;
149 obj
= kzalloc(sizeof(*obj
), GFP_KERNEL
);
155 ret
= drm_gem_private_object_init(dev
, &obj
->base
, size
);
162 obj
->base
.import_attach
= attach
;
167 dma_buf_unmap_attachment(attach
, sg
, DMA_BIDIRECTIONAL
);
169 dma_buf_detach(dma_buf
, attach
);