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>
27 #include <linux/dma-buf.h>
28 #include <linux/reservation.h>
34 static struct drm_i915_gem_object
*dma_buf_to_obj(struct dma_buf
*buf
)
36 return to_intel_bo(buf
->priv
);
39 static struct sg_table
*i915_gem_map_dma_buf(struct dma_buf_attachment
*attachment
,
40 enum dma_data_direction dir
)
42 struct drm_i915_gem_object
*obj
= dma_buf_to_obj(attachment
->dmabuf
);
44 struct scatterlist
*src
, *dst
;
47 ret
= i915_gem_object_pin_pages(obj
);
51 /* Copy sg so that we make an independent mapping */
52 st
= kmalloc(sizeof(struct sg_table
), GFP_KERNEL
);
58 ret
= sg_alloc_table(st
, obj
->mm
.pages
->nents
, GFP_KERNEL
);
62 src
= obj
->mm
.pages
->sgl
;
64 for (i
= 0; i
< obj
->mm
.pages
->nents
; i
++) {
65 sg_set_page(dst
, sg_page(src
), src
->length
, 0);
70 if (!dma_map_sg(attachment
->dev
, st
->sgl
, st
->nents
, dir
)) {
82 i915_gem_object_unpin_pages(obj
);
87 static void i915_gem_unmap_dma_buf(struct dma_buf_attachment
*attachment
,
89 enum dma_data_direction dir
)
91 struct drm_i915_gem_object
*obj
= dma_buf_to_obj(attachment
->dmabuf
);
93 dma_unmap_sg(attachment
->dev
, sg
->sgl
, sg
->nents
, dir
);
97 i915_gem_object_unpin_pages(obj
);
100 static void *i915_gem_dmabuf_vmap(struct dma_buf
*dma_buf
)
102 struct drm_i915_gem_object
*obj
= dma_buf_to_obj(dma_buf
);
104 return i915_gem_object_pin_map(obj
, I915_MAP_WB
);
107 static void i915_gem_dmabuf_vunmap(struct dma_buf
*dma_buf
, void *vaddr
)
109 struct drm_i915_gem_object
*obj
= dma_buf_to_obj(dma_buf
);
111 i915_gem_object_unpin_map(obj
);
114 static void *i915_gem_dmabuf_kmap_atomic(struct dma_buf
*dma_buf
, unsigned long page_num
)
119 static void i915_gem_dmabuf_kunmap_atomic(struct dma_buf
*dma_buf
, unsigned long page_num
, void *addr
)
123 static void *i915_gem_dmabuf_kmap(struct dma_buf
*dma_buf
, unsigned long page_num
)
125 struct drm_i915_gem_object
*obj
= dma_buf_to_obj(dma_buf
);
128 if (page_num
>= obj
->base
.size
>> PAGE_SHIFT
)
131 if (!i915_gem_object_has_struct_page(obj
))
134 if (i915_gem_object_pin_pages(obj
))
137 /* Synchronisation is left to the caller (via .begin_cpu_access()) */
138 page
= i915_gem_object_get_page(obj
, page_num
);
145 i915_gem_object_unpin_pages(obj
);
149 static void i915_gem_dmabuf_kunmap(struct dma_buf
*dma_buf
, unsigned long page_num
, void *addr
)
151 struct drm_i915_gem_object
*obj
= dma_buf_to_obj(dma_buf
);
153 kunmap(virt_to_page(addr
));
154 i915_gem_object_unpin_pages(obj
);
157 static int i915_gem_dmabuf_mmap(struct dma_buf
*dma_buf
, struct vm_area_struct
*vma
)
159 struct drm_i915_gem_object
*obj
= dma_buf_to_obj(dma_buf
);
162 if (obj
->base
.size
< vma
->vm_end
- vma
->vm_start
)
168 ret
= call_mmap(obj
->base
.filp
, vma
);
173 vma
->vm_file
= get_file(obj
->base
.filp
);
178 static int i915_gem_begin_cpu_access(struct dma_buf
*dma_buf
, enum dma_data_direction direction
)
180 struct drm_i915_gem_object
*obj
= dma_buf_to_obj(dma_buf
);
181 struct drm_device
*dev
= obj
->base
.dev
;
182 bool write
= (direction
== DMA_BIDIRECTIONAL
|| direction
== DMA_TO_DEVICE
);
185 err
= i915_gem_object_pin_pages(obj
);
189 err
= i915_mutex_lock_interruptible(dev
);
193 err
= i915_gem_object_set_to_cpu_domain(obj
, write
);
194 mutex_unlock(&dev
->struct_mutex
);
197 i915_gem_object_unpin_pages(obj
);
201 static int i915_gem_end_cpu_access(struct dma_buf
*dma_buf
, enum dma_data_direction direction
)
203 struct drm_i915_gem_object
*obj
= dma_buf_to_obj(dma_buf
);
204 struct drm_device
*dev
= obj
->base
.dev
;
207 err
= i915_gem_object_pin_pages(obj
);
211 err
= i915_mutex_lock_interruptible(dev
);
215 err
= i915_gem_object_set_to_gtt_domain(obj
, false);
216 mutex_unlock(&dev
->struct_mutex
);
219 i915_gem_object_unpin_pages(obj
);
223 static const struct dma_buf_ops i915_dmabuf_ops
= {
224 .map_dma_buf
= i915_gem_map_dma_buf
,
225 .unmap_dma_buf
= i915_gem_unmap_dma_buf
,
226 .release
= drm_gem_dmabuf_release
,
227 .map
= i915_gem_dmabuf_kmap
,
228 .map_atomic
= i915_gem_dmabuf_kmap_atomic
,
229 .unmap
= i915_gem_dmabuf_kunmap
,
230 .unmap_atomic
= i915_gem_dmabuf_kunmap_atomic
,
231 .mmap
= i915_gem_dmabuf_mmap
,
232 .vmap
= i915_gem_dmabuf_vmap
,
233 .vunmap
= i915_gem_dmabuf_vunmap
,
234 .begin_cpu_access
= i915_gem_begin_cpu_access
,
235 .end_cpu_access
= i915_gem_end_cpu_access
,
238 struct dma_buf
*i915_gem_prime_export(struct drm_device
*dev
,
239 struct drm_gem_object
*gem_obj
, int flags
)
241 struct drm_i915_gem_object
*obj
= to_intel_bo(gem_obj
);
242 DEFINE_DMA_BUF_EXPORT_INFO(exp_info
);
244 exp_info
.ops
= &i915_dmabuf_ops
;
245 exp_info
.size
= gem_obj
->size
;
246 exp_info
.flags
= flags
;
247 exp_info
.priv
= gem_obj
;
248 exp_info
.resv
= obj
->resv
;
250 if (obj
->ops
->dmabuf_export
) {
251 int ret
= obj
->ops
->dmabuf_export(obj
);
256 return drm_gem_dmabuf_export(dev
, &exp_info
);
259 static int i915_gem_object_get_pages_dmabuf(struct drm_i915_gem_object
*obj
)
261 struct sg_table
*pages
;
262 unsigned int sg_page_sizes
;
264 pages
= dma_buf_map_attachment(obj
->base
.import_attach
,
267 return PTR_ERR(pages
);
269 sg_page_sizes
= i915_sg_page_sizes(pages
->sgl
);
271 __i915_gem_object_set_pages(obj
, pages
, sg_page_sizes
);
276 static void i915_gem_object_put_pages_dmabuf(struct drm_i915_gem_object
*obj
,
277 struct sg_table
*pages
)
279 dma_buf_unmap_attachment(obj
->base
.import_attach
, pages
,
283 static const struct drm_i915_gem_object_ops i915_gem_object_dmabuf_ops
= {
284 .get_pages
= i915_gem_object_get_pages_dmabuf
,
285 .put_pages
= i915_gem_object_put_pages_dmabuf
,
288 struct drm_gem_object
*i915_gem_prime_import(struct drm_device
*dev
,
289 struct dma_buf
*dma_buf
)
291 struct dma_buf_attachment
*attach
;
292 struct drm_i915_gem_object
*obj
;
295 /* is this one of own objects? */
296 if (dma_buf
->ops
== &i915_dmabuf_ops
) {
297 obj
= dma_buf_to_obj(dma_buf
);
298 /* is it from our device? */
299 if (obj
->base
.dev
== dev
) {
301 * Importing dmabuf exported from out own gem increases
302 * refcount on gem itself instead of f_count of dmabuf.
304 return &i915_gem_object_get(obj
)->base
;
309 attach
= dma_buf_attach(dma_buf
, dev
->dev
);
311 return ERR_CAST(attach
);
313 get_dma_buf(dma_buf
);
315 obj
= i915_gem_object_alloc(to_i915(dev
));
321 drm_gem_private_object_init(dev
, &obj
->base
, dma_buf
->size
);
322 i915_gem_object_init(obj
, &i915_gem_object_dmabuf_ops
);
323 obj
->base
.import_attach
= attach
;
324 obj
->resv
= dma_buf
->resv
;
326 /* We use GTT as shorthand for a coherent domain, one that is
327 * neither in the GPU cache nor in the CPU cache, where all
328 * writes are immediately visible in memory. (That's not strictly
329 * true, but it's close! There are internal buffers such as the
330 * write-combined buffer or a delay through the chipset for GTT
331 * writes that do require us to treat GTT as a separate cache domain.)
333 obj
->base
.read_domains
= I915_GEM_DOMAIN_GTT
;
334 obj
->base
.write_domain
= 0;
339 dma_buf_detach(dma_buf
, attach
);
340 dma_buf_put(dma_buf
);
345 #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
346 #include "selftests/mock_dmabuf.c"
347 #include "selftests/i915_gem_dmabuf.c"