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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; | |
6c085a72 | 36 | struct sg_table *sg; |
1286ff73 DV |
37 | int ret; |
38 | int nents; | |
39 | ||
40 | ret = i915_mutex_lock_interruptible(dev); | |
41 | if (ret) | |
42 | return ERR_PTR(ret); | |
43 | ||
37e680a1 | 44 | ret = i915_gem_object_get_pages(obj); |
6c085a72 CW |
45 | if (ret) { |
46 | sg = ERR_PTR(ret); | |
47 | goto out; | |
1286ff73 DV |
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); | |
a5570178 CW |
53 | i915_gem_object_pin_pages(obj); |
54 | ||
1286ff73 DV |
55 | out: |
56 | mutex_unlock(&dev->struct_mutex); | |
57 | return sg; | |
58 | } | |
59 | ||
6a101cb2 | 60 | static void i915_gem_unmap_dma_buf(struct dma_buf_attachment *attachment, |
1286ff73 DV |
61 | struct sg_table *sg, enum dma_data_direction dir) |
62 | { | |
63 | dma_unmap_sg(attachment->dev, sg->sgl, sg->nents, dir); | |
64 | sg_free_table(sg); | |
65 | kfree(sg); | |
66 | } | |
67 | ||
6a101cb2 | 68 | static void i915_gem_dmabuf_release(struct dma_buf *dma_buf) |
1286ff73 DV |
69 | { |
70 | struct drm_i915_gem_object *obj = dma_buf->priv; | |
71 | ||
72 | if (obj->base.export_dma_buf == dma_buf) { | |
73 | /* drop the reference on the export fd holds */ | |
74 | obj->base.export_dma_buf = NULL; | |
75 | drm_gem_object_unreference_unlocked(&obj->base); | |
76 | } | |
77 | } | |
78 | ||
9a70cc2a DA |
79 | static void *i915_gem_dmabuf_vmap(struct dma_buf *dma_buf) |
80 | { | |
81 | struct drm_i915_gem_object *obj = dma_buf->priv; | |
82 | struct drm_device *dev = obj->base.dev; | |
83 | int ret; | |
84 | ||
85 | ret = i915_mutex_lock_interruptible(dev); | |
86 | if (ret) | |
87 | return ERR_PTR(ret); | |
88 | ||
89 | if (obj->dma_buf_vmapping) { | |
90 | obj->vmapping_count++; | |
91 | goto out_unlock; | |
92 | } | |
93 | ||
37e680a1 | 94 | ret = i915_gem_object_get_pages(obj); |
6c085a72 CW |
95 | if (ret) { |
96 | mutex_unlock(&dev->struct_mutex); | |
97 | return ERR_PTR(ret); | |
9a70cc2a DA |
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; | |
a5570178 | 107 | i915_gem_object_pin_pages(obj); |
9a70cc2a DA |
108 | out_unlock: |
109 | mutex_unlock(&dev->struct_mutex); | |
110 | return obj->dma_buf_vmapping; | |
111 | } | |
112 | ||
113 | static void i915_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr) | |
114 | { | |
115 | struct drm_i915_gem_object *obj = dma_buf->priv; | |
116 | struct drm_device *dev = obj->base.dev; | |
117 | int ret; | |
118 | ||
119 | ret = i915_mutex_lock_interruptible(dev); | |
120 | if (ret) | |
121 | return; | |
122 | ||
a5570178 | 123 | if (--obj->vmapping_count == 0) { |
9a70cc2a DA |
124 | vunmap(obj->dma_buf_vmapping); |
125 | obj->dma_buf_vmapping = NULL; | |
a5570178 CW |
126 | |
127 | i915_gem_object_unpin_pages(obj); | |
9a70cc2a DA |
128 | } |
129 | mutex_unlock(&dev->struct_mutex); | |
130 | } | |
131 | ||
1286ff73 DV |
132 | static void *i915_gem_dmabuf_kmap_atomic(struct dma_buf *dma_buf, unsigned long page_num) |
133 | { | |
134 | return NULL; | |
135 | } | |
136 | ||
137 | static void i915_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf, unsigned long page_num, void *addr) | |
138 | { | |
139 | ||
140 | } | |
141 | static void *i915_gem_dmabuf_kmap(struct dma_buf *dma_buf, unsigned long page_num) | |
142 | { | |
143 | return NULL; | |
144 | } | |
145 | ||
146 | static void i915_gem_dmabuf_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr) | |
147 | { | |
148 | ||
149 | } | |
150 | ||
2dad9d4d DA |
151 | static int i915_gem_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma) |
152 | { | |
153 | return -EINVAL; | |
154 | } | |
155 | ||
ec6f1bb9 DA |
156 | static int i915_gem_begin_cpu_access(struct dma_buf *dma_buf, size_t start, size_t length, enum dma_data_direction direction) |
157 | { | |
158 | struct drm_i915_gem_object *obj = dma_buf->priv; | |
159 | struct drm_device *dev = obj->base.dev; | |
160 | int ret; | |
161 | bool write = (direction == DMA_BIDIRECTIONAL || direction == DMA_TO_DEVICE); | |
162 | ||
163 | ret = i915_mutex_lock_interruptible(dev); | |
164 | if (ret) | |
165 | return ret; | |
166 | ||
167 | ret = i915_gem_object_set_to_cpu_domain(obj, write); | |
168 | mutex_unlock(&dev->struct_mutex); | |
169 | return ret; | |
170 | } | |
171 | ||
6a101cb2 | 172 | static const struct dma_buf_ops i915_dmabuf_ops = { |
1286ff73 DV |
173 | .map_dma_buf = i915_gem_map_dma_buf, |
174 | .unmap_dma_buf = i915_gem_unmap_dma_buf, | |
175 | .release = i915_gem_dmabuf_release, | |
176 | .kmap = i915_gem_dmabuf_kmap, | |
177 | .kmap_atomic = i915_gem_dmabuf_kmap_atomic, | |
178 | .kunmap = i915_gem_dmabuf_kunmap, | |
179 | .kunmap_atomic = i915_gem_dmabuf_kunmap_atomic, | |
2dad9d4d | 180 | .mmap = i915_gem_dmabuf_mmap, |
9a70cc2a DA |
181 | .vmap = i915_gem_dmabuf_vmap, |
182 | .vunmap = i915_gem_dmabuf_vunmap, | |
ec6f1bb9 | 183 | .begin_cpu_access = i915_gem_begin_cpu_access, |
1286ff73 DV |
184 | }; |
185 | ||
186 | struct dma_buf *i915_gem_prime_export(struct drm_device *dev, | |
187 | struct drm_gem_object *gem_obj, int flags) | |
188 | { | |
189 | struct drm_i915_gem_object *obj = to_intel_bo(gem_obj); | |
190 | ||
191 | return dma_buf_export(obj, &i915_dmabuf_ops, | |
192 | obj->base.size, 0600); | |
193 | } | |
194 | ||
195 | struct drm_gem_object *i915_gem_prime_import(struct drm_device *dev, | |
196 | struct dma_buf *dma_buf) | |
197 | { | |
198 | struct dma_buf_attachment *attach; | |
199 | struct sg_table *sg; | |
200 | struct drm_i915_gem_object *obj; | |
201 | int npages; | |
202 | int size; | |
203 | int ret; | |
204 | ||
205 | /* is this one of own objects? */ | |
206 | if (dma_buf->ops == &i915_dmabuf_ops) { | |
207 | obj = dma_buf->priv; | |
208 | /* is it from our device? */ | |
209 | if (obj->base.dev == dev) { | |
210 | drm_gem_object_reference(&obj->base); | |
211 | return &obj->base; | |
212 | } | |
213 | } | |
214 | ||
215 | /* need to attach */ | |
216 | attach = dma_buf_attach(dma_buf, dev->dev); | |
217 | if (IS_ERR(attach)) | |
218 | return ERR_CAST(attach); | |
219 | ||
220 | sg = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL); | |
221 | if (IS_ERR(sg)) { | |
222 | ret = PTR_ERR(sg); | |
223 | goto fail_detach; | |
224 | } | |
225 | ||
226 | size = dma_buf->size; | |
227 | npages = size / PAGE_SIZE; | |
228 | ||
229 | obj = kzalloc(sizeof(*obj), GFP_KERNEL); | |
230 | if (obj == NULL) { | |
231 | ret = -ENOMEM; | |
232 | goto fail_unmap; | |
233 | } | |
234 | ||
235 | ret = drm_gem_private_object_init(dev, &obj->base, size); | |
236 | if (ret) { | |
237 | kfree(obj); | |
238 | goto fail_unmap; | |
239 | } | |
240 | ||
241 | obj->sg_table = sg; | |
242 | obj->base.import_attach = attach; | |
243 | ||
244 | return &obj->base; | |
245 | ||
246 | fail_unmap: | |
247 | dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL); | |
248 | fail_detach: | |
249 | dma_buf_detach(dma_buf, attach); | |
250 | return ERR_PTR(ret); | |
251 | } |