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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 | */ | |
760285e7 | 26 | #include <drm/drmP.h> |
1286ff73 DV |
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 | ||
9a70cc2a DA |
77 | static void *i915_gem_dmabuf_vmap(struct dma_buf *dma_buf) |
78 | { | |
79 | struct drm_i915_gem_object *obj = dma_buf->priv; | |
80 | struct drm_device *dev = obj->base.dev; | |
81 | int ret; | |
82 | ||
83 | ret = i915_mutex_lock_interruptible(dev); | |
84 | if (ret) | |
85 | return ERR_PTR(ret); | |
86 | ||
87 | if (obj->dma_buf_vmapping) { | |
88 | obj->vmapping_count++; | |
89 | goto out_unlock; | |
90 | } | |
91 | ||
92 | if (!obj->pages) { | |
93 | ret = i915_gem_object_get_pages_gtt(obj, __GFP_NORETRY | __GFP_NOWARN); | |
94 | if (ret) { | |
95 | mutex_unlock(&dev->struct_mutex); | |
96 | return ERR_PTR(ret); | |
97 | } | |
98 | } | |
99 | ||
100 | obj->dma_buf_vmapping = vmap(obj->pages, obj->base.size / PAGE_SIZE, 0, PAGE_KERNEL); | |
101 | if (!obj->dma_buf_vmapping) { | |
102 | DRM_ERROR("failed to vmap object\n"); | |
103 | goto out_unlock; | |
104 | } | |
105 | ||
106 | obj->vmapping_count = 1; | |
107 | out_unlock: | |
108 | mutex_unlock(&dev->struct_mutex); | |
109 | return obj->dma_buf_vmapping; | |
110 | } | |
111 | ||
112 | static void i915_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr) | |
113 | { | |
114 | struct drm_i915_gem_object *obj = dma_buf->priv; | |
115 | struct drm_device *dev = obj->base.dev; | |
116 | int ret; | |
117 | ||
118 | ret = i915_mutex_lock_interruptible(dev); | |
119 | if (ret) | |
120 | return; | |
121 | ||
122 | --obj->vmapping_count; | |
123 | if (obj->vmapping_count == 0) { | |
124 | vunmap(obj->dma_buf_vmapping); | |
125 | obj->dma_buf_vmapping = NULL; | |
126 | } | |
127 | mutex_unlock(&dev->struct_mutex); | |
128 | } | |
129 | ||
1286ff73 DV |
130 | static void *i915_gem_dmabuf_kmap_atomic(struct dma_buf *dma_buf, unsigned long page_num) |
131 | { | |
132 | return NULL; | |
133 | } | |
134 | ||
135 | static void i915_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf, unsigned long page_num, void *addr) | |
136 | { | |
137 | ||
138 | } | |
139 | static void *i915_gem_dmabuf_kmap(struct dma_buf *dma_buf, unsigned long page_num) | |
140 | { | |
141 | return NULL; | |
142 | } | |
143 | ||
144 | static void i915_gem_dmabuf_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr) | |
145 | { | |
146 | ||
147 | } | |
148 | ||
2dad9d4d DA |
149 | static int i915_gem_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma) |
150 | { | |
151 | return -EINVAL; | |
152 | } | |
153 | ||
6a101cb2 | 154 | static const struct dma_buf_ops i915_dmabuf_ops = { |
1286ff73 DV |
155 | .map_dma_buf = i915_gem_map_dma_buf, |
156 | .unmap_dma_buf = i915_gem_unmap_dma_buf, | |
157 | .release = i915_gem_dmabuf_release, | |
158 | .kmap = i915_gem_dmabuf_kmap, | |
159 | .kmap_atomic = i915_gem_dmabuf_kmap_atomic, | |
160 | .kunmap = i915_gem_dmabuf_kunmap, | |
161 | .kunmap_atomic = i915_gem_dmabuf_kunmap_atomic, | |
2dad9d4d | 162 | .mmap = i915_gem_dmabuf_mmap, |
9a70cc2a DA |
163 | .vmap = i915_gem_dmabuf_vmap, |
164 | .vunmap = i915_gem_dmabuf_vunmap, | |
1286ff73 DV |
165 | }; |
166 | ||
167 | struct dma_buf *i915_gem_prime_export(struct drm_device *dev, | |
168 | struct drm_gem_object *gem_obj, int flags) | |
169 | { | |
170 | struct drm_i915_gem_object *obj = to_intel_bo(gem_obj); | |
171 | ||
172 | return dma_buf_export(obj, &i915_dmabuf_ops, | |
173 | obj->base.size, 0600); | |
174 | } | |
175 | ||
176 | struct drm_gem_object *i915_gem_prime_import(struct drm_device *dev, | |
177 | struct dma_buf *dma_buf) | |
178 | { | |
179 | struct dma_buf_attachment *attach; | |
180 | struct sg_table *sg; | |
181 | struct drm_i915_gem_object *obj; | |
182 | int npages; | |
183 | int size; | |
184 | int ret; | |
185 | ||
186 | /* is this one of own objects? */ | |
187 | if (dma_buf->ops == &i915_dmabuf_ops) { | |
188 | obj = dma_buf->priv; | |
189 | /* is it from our device? */ | |
190 | if (obj->base.dev == dev) { | |
191 | drm_gem_object_reference(&obj->base); | |
192 | return &obj->base; | |
193 | } | |
194 | } | |
195 | ||
196 | /* need to attach */ | |
197 | attach = dma_buf_attach(dma_buf, dev->dev); | |
198 | if (IS_ERR(attach)) | |
199 | return ERR_CAST(attach); | |
200 | ||
201 | sg = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL); | |
202 | if (IS_ERR(sg)) { | |
203 | ret = PTR_ERR(sg); | |
204 | goto fail_detach; | |
205 | } | |
206 | ||
207 | size = dma_buf->size; | |
208 | npages = size / PAGE_SIZE; | |
209 | ||
210 | obj = kzalloc(sizeof(*obj), GFP_KERNEL); | |
211 | if (obj == NULL) { | |
212 | ret = -ENOMEM; | |
213 | goto fail_unmap; | |
214 | } | |
215 | ||
216 | ret = drm_gem_private_object_init(dev, &obj->base, size); | |
217 | if (ret) { | |
218 | kfree(obj); | |
219 | goto fail_unmap; | |
220 | } | |
221 | ||
222 | obj->sg_table = sg; | |
223 | obj->base.import_attach = attach; | |
224 | ||
225 | return &obj->base; | |
226 | ||
227 | fail_unmap: | |
228 | dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL); | |
229 | fail_detach: | |
230 | dma_buf_detach(dma_buf, attach); | |
231 | return ERR_PTR(ret); | |
232 | } |