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
;
35 struct scatterlist
*src
, *dst
;
38 ret
= i915_mutex_lock_interruptible(obj
->base
.dev
);
42 ret
= i915_gem_object_get_pages(obj
);
48 /* Copy sg so that we make an independent mapping */
49 st
= kmalloc(sizeof(struct sg_table
), GFP_KERNEL
);
51 st
= ERR_PTR(-ENOMEM
);
55 ret
= sg_alloc_table(st
, obj
->pages
->nents
, GFP_KERNEL
);
62 src
= obj
->pages
->sgl
;
64 for (i
= 0; i
< obj
->pages
->nents
; i
++) {
65 sg_set_page(dst
, sg_page(src
), PAGE_SIZE
, 0);
70 if (!dma_map_sg(attachment
->dev
, st
->sgl
, st
->nents
, dir
)) {
73 st
= ERR_PTR(-ENOMEM
);
77 i915_gem_object_pin_pages(obj
);
80 mutex_unlock(&obj
->base
.dev
->struct_mutex
);
84 static void i915_gem_unmap_dma_buf(struct dma_buf_attachment
*attachment
,
86 enum dma_data_direction dir
)
88 dma_unmap_sg(attachment
->dev
, sg
->sgl
, sg
->nents
, dir
);
93 static void i915_gem_dmabuf_release(struct dma_buf
*dma_buf
)
95 struct drm_i915_gem_object
*obj
= dma_buf
->priv
;
97 if (obj
->base
.export_dma_buf
== dma_buf
) {
98 /* drop the reference on the export fd holds */
99 obj
->base
.export_dma_buf
= NULL
;
100 drm_gem_object_unreference_unlocked(&obj
->base
);
104 static void *i915_gem_dmabuf_vmap(struct dma_buf
*dma_buf
)
106 struct drm_i915_gem_object
*obj
= dma_buf
->priv
;
107 struct drm_device
*dev
= obj
->base
.dev
;
108 struct scatterlist
*sg
;
112 ret
= i915_mutex_lock_interruptible(dev
);
116 if (obj
->dma_buf_vmapping
) {
117 obj
->vmapping_count
++;
121 ret
= i915_gem_object_get_pages(obj
);
127 pages
= drm_malloc_ab(obj
->pages
->nents
, sizeof(struct page
*));
131 for_each_sg(obj
->pages
->sgl
, sg
, obj
->pages
->nents
, i
)
132 pages
[i
] = sg_page(sg
);
134 obj
->dma_buf_vmapping
= vmap(pages
, obj
->pages
->nents
, 0, PAGE_KERNEL
);
135 drm_free_large(pages
);
137 if (!obj
->dma_buf_vmapping
)
140 obj
->vmapping_count
= 1;
141 i915_gem_object_pin_pages(obj
);
143 mutex_unlock(&dev
->struct_mutex
);
144 return obj
->dma_buf_vmapping
;
147 mutex_unlock(&dev
->struct_mutex
);
151 static void i915_gem_dmabuf_vunmap(struct dma_buf
*dma_buf
, void *vaddr
)
153 struct drm_i915_gem_object
*obj
= dma_buf
->priv
;
154 struct drm_device
*dev
= obj
->base
.dev
;
157 ret
= i915_mutex_lock_interruptible(dev
);
161 if (--obj
->vmapping_count
== 0) {
162 vunmap(obj
->dma_buf_vmapping
);
163 obj
->dma_buf_vmapping
= NULL
;
165 i915_gem_object_unpin_pages(obj
);
167 mutex_unlock(&dev
->struct_mutex
);
170 static void *i915_gem_dmabuf_kmap_atomic(struct dma_buf
*dma_buf
, unsigned long page_num
)
175 static void i915_gem_dmabuf_kunmap_atomic(struct dma_buf
*dma_buf
, unsigned long page_num
, void *addr
)
179 static void *i915_gem_dmabuf_kmap(struct dma_buf
*dma_buf
, unsigned long page_num
)
184 static void i915_gem_dmabuf_kunmap(struct dma_buf
*dma_buf
, unsigned long page_num
, void *addr
)
189 static int i915_gem_dmabuf_mmap(struct dma_buf
*dma_buf
, struct vm_area_struct
*vma
)
194 static int i915_gem_begin_cpu_access(struct dma_buf
*dma_buf
, size_t start
, size_t length
, enum dma_data_direction direction
)
196 struct drm_i915_gem_object
*obj
= dma_buf
->priv
;
197 struct drm_device
*dev
= obj
->base
.dev
;
199 bool write
= (direction
== DMA_BIDIRECTIONAL
|| direction
== DMA_TO_DEVICE
);
201 ret
= i915_mutex_lock_interruptible(dev
);
205 ret
= i915_gem_object_set_to_cpu_domain(obj
, write
);
206 mutex_unlock(&dev
->struct_mutex
);
210 static const struct dma_buf_ops i915_dmabuf_ops
= {
211 .map_dma_buf
= i915_gem_map_dma_buf
,
212 .unmap_dma_buf
= i915_gem_unmap_dma_buf
,
213 .release
= i915_gem_dmabuf_release
,
214 .kmap
= i915_gem_dmabuf_kmap
,
215 .kmap_atomic
= i915_gem_dmabuf_kmap_atomic
,
216 .kunmap
= i915_gem_dmabuf_kunmap
,
217 .kunmap_atomic
= i915_gem_dmabuf_kunmap_atomic
,
218 .mmap
= i915_gem_dmabuf_mmap
,
219 .vmap
= i915_gem_dmabuf_vmap
,
220 .vunmap
= i915_gem_dmabuf_vunmap
,
221 .begin_cpu_access
= i915_gem_begin_cpu_access
,
224 struct dma_buf
*i915_gem_prime_export(struct drm_device
*dev
,
225 struct drm_gem_object
*gem_obj
, int flags
)
227 struct drm_i915_gem_object
*obj
= to_intel_bo(gem_obj
);
229 return dma_buf_export(obj
, &i915_dmabuf_ops
, obj
->base
.size
, flags
);
232 static int i915_gem_object_get_pages_dmabuf(struct drm_i915_gem_object
*obj
)
236 sg
= dma_buf_map_attachment(obj
->base
.import_attach
, DMA_BIDIRECTIONAL
);
241 obj
->has_dma_mapping
= true;
245 static void i915_gem_object_put_pages_dmabuf(struct drm_i915_gem_object
*obj
)
247 dma_buf_unmap_attachment(obj
->base
.import_attach
,
248 obj
->pages
, DMA_BIDIRECTIONAL
);
249 obj
->has_dma_mapping
= false;
252 static const struct drm_i915_gem_object_ops i915_gem_object_dmabuf_ops
= {
253 .get_pages
= i915_gem_object_get_pages_dmabuf
,
254 .put_pages
= i915_gem_object_put_pages_dmabuf
,
257 struct drm_gem_object
*i915_gem_prime_import(struct drm_device
*dev
,
258 struct dma_buf
*dma_buf
)
260 struct dma_buf_attachment
*attach
;
261 struct drm_i915_gem_object
*obj
;
264 /* is this one of own objects? */
265 if (dma_buf
->ops
== &i915_dmabuf_ops
) {
267 /* is it from our device? */
268 if (obj
->base
.dev
== dev
) {
270 * Importing dmabuf exported from out own gem increases
271 * refcount on gem itself instead of f_count of dmabuf.
273 drm_gem_object_reference(&obj
->base
);
274 dma_buf_put(dma_buf
);
280 attach
= dma_buf_attach(dma_buf
, dev
->dev
);
282 return ERR_CAST(attach
);
284 obj
= i915_gem_object_alloc(dev
);
290 ret
= drm_gem_private_object_init(dev
, &obj
->base
, dma_buf
->size
);
292 i915_gem_object_free(obj
);
296 i915_gem_object_init(obj
, &i915_gem_object_dmabuf_ops
);
297 obj
->base
.import_attach
= attach
;
302 dma_buf_detach(dma_buf
, attach
);