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1286ff73 DV |
1 | /* |
2 | * Copyright 2012 Red Hat 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 (including the next | |
12 | * paragraph) shall be included in all copies or substantial portions of the | |
13 | * Software. | |
14 | * | |
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. | |
22 | * | |
23 | * Authors: | |
24 | * Dave Airlie <airlied@redhat.com> | |
25 | */ | |
26 | #include "drmP.h" | |
27 | #include "i915_drv.h" | |
28 | #include <linux/dma-buf.h> | |
29 | ||
6a101cb2 | 30 | static struct sg_table *i915_gem_map_dma_buf(struct dma_buf_attachment *attachment, |
1286ff73 DV |
31 | enum dma_data_direction dir) |
32 | { | |
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; | |
37 | int ret; | |
38 | int nents; | |
39 | ||
40 | ret = i915_mutex_lock_interruptible(dev); | |
41 | if (ret) | |
42 | return ERR_PTR(ret); | |
43 | ||
44 | if (!obj->pages) { | |
45 | ret = i915_gem_object_get_pages_gtt(obj, __GFP_NORETRY | __GFP_NOWARN); | |
46 | if (ret) | |
47 | goto out; | |
48 | } | |
49 | ||
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); | |
53 | out: | |
54 | mutex_unlock(&dev->struct_mutex); | |
55 | return sg; | |
56 | } | |
57 | ||
6a101cb2 | 58 | static void i915_gem_unmap_dma_buf(struct dma_buf_attachment *attachment, |
1286ff73 DV |
59 | struct sg_table *sg, enum dma_data_direction dir) |
60 | { | |
61 | dma_unmap_sg(attachment->dev, sg->sgl, sg->nents, dir); | |
62 | sg_free_table(sg); | |
63 | kfree(sg); | |
64 | } | |
65 | ||
6a101cb2 | 66 | static void i915_gem_dmabuf_release(struct dma_buf *dma_buf) |
1286ff73 DV |
67 | { |
68 | struct drm_i915_gem_object *obj = dma_buf->priv; | |
69 | ||
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); | |
74 | } | |
75 | } | |
76 | ||
77 | static void *i915_gem_dmabuf_kmap_atomic(struct dma_buf *dma_buf, unsigned long page_num) | |
78 | { | |
79 | return NULL; | |
80 | } | |
81 | ||
82 | static void i915_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf, unsigned long page_num, void *addr) | |
83 | { | |
84 | ||
85 | } | |
86 | static void *i915_gem_dmabuf_kmap(struct dma_buf *dma_buf, unsigned long page_num) | |
87 | { | |
88 | return NULL; | |
89 | } | |
90 | ||
91 | static void i915_gem_dmabuf_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr) | |
92 | { | |
93 | ||
94 | } | |
95 | ||
6a101cb2 | 96 | static const struct dma_buf_ops i915_dmabuf_ops = { |
1286ff73 DV |
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, | |
104 | }; | |
105 | ||
106 | struct dma_buf *i915_gem_prime_export(struct drm_device *dev, | |
107 | struct drm_gem_object *gem_obj, int flags) | |
108 | { | |
109 | struct drm_i915_gem_object *obj = to_intel_bo(gem_obj); | |
110 | ||
111 | return dma_buf_export(obj, &i915_dmabuf_ops, | |
112 | obj->base.size, 0600); | |
113 | } | |
114 | ||
115 | struct drm_gem_object *i915_gem_prime_import(struct drm_device *dev, | |
116 | struct dma_buf *dma_buf) | |
117 | { | |
118 | struct dma_buf_attachment *attach; | |
119 | struct sg_table *sg; | |
120 | struct drm_i915_gem_object *obj; | |
121 | int npages; | |
122 | int size; | |
123 | int ret; | |
124 | ||
125 | /* is this one of own objects? */ | |
126 | if (dma_buf->ops == &i915_dmabuf_ops) { | |
127 | obj = dma_buf->priv; | |
128 | /* is it from our device? */ | |
129 | if (obj->base.dev == dev) { | |
130 | drm_gem_object_reference(&obj->base); | |
131 | return &obj->base; | |
132 | } | |
133 | } | |
134 | ||
135 | /* need to attach */ | |
136 | attach = dma_buf_attach(dma_buf, dev->dev); | |
137 | if (IS_ERR(attach)) | |
138 | return ERR_CAST(attach); | |
139 | ||
140 | sg = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL); | |
141 | if (IS_ERR(sg)) { | |
142 | ret = PTR_ERR(sg); | |
143 | goto fail_detach; | |
144 | } | |
145 | ||
146 | size = dma_buf->size; | |
147 | npages = size / PAGE_SIZE; | |
148 | ||
149 | obj = kzalloc(sizeof(*obj), GFP_KERNEL); | |
150 | if (obj == NULL) { | |
151 | ret = -ENOMEM; | |
152 | goto fail_unmap; | |
153 | } | |
154 | ||
155 | ret = drm_gem_private_object_init(dev, &obj->base, size); | |
156 | if (ret) { | |
157 | kfree(obj); | |
158 | goto fail_unmap; | |
159 | } | |
160 | ||
161 | obj->sg_table = sg; | |
162 | obj->base.import_attach = attach; | |
163 | ||
164 | return &obj->base; | |
165 | ||
166 | fail_unmap: | |
167 | dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL); | |
168 | fail_detach: | |
169 | dma_buf_detach(dma_buf, attach); | |
170 | return ERR_PTR(ret); | |
171 | } |