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 drm_i915_gem_object *dma_buf_to_obj(struct dma_buf *buf)
32 return to_intel_bo(buf->priv);
35 static struct sg_table *i915_gem_map_dma_buf(struct dma_buf_attachment *attachment,
36 enum dma_data_direction dir)
38 struct drm_i915_gem_object *obj = dma_buf_to_obj(attachment->dmabuf);
40 struct scatterlist *src, *dst;
43 ret = i915_mutex_lock_interruptible(obj->base.dev);
47 ret = i915_gem_object_get_pages(obj);
51 i915_gem_object_pin_pages(obj);
53 /* Copy sg so that we make an independent mapping */
54 st = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
60 ret = sg_alloc_table(st, obj->pages->nents, GFP_KERNEL);
64 src = obj->pages->sgl;
66 for (i = 0; i < obj->pages->nents; i++) {
67 sg_set_page(dst, sg_page(src), src->length, 0);
72 if (!dma_map_sg(attachment->dev, st->sgl, st->nents, dir)) {
77 mutex_unlock(&obj->base.dev->struct_mutex);
85 i915_gem_object_unpin_pages(obj);
87 mutex_unlock(&obj->base.dev->struct_mutex);
92 static void i915_gem_unmap_dma_buf(struct dma_buf_attachment *attachment,
94 enum dma_data_direction dir)
96 struct drm_i915_gem_object *obj = dma_buf_to_obj(attachment->dmabuf);
98 mutex_lock(&obj->base.dev->struct_mutex);
100 dma_unmap_sg(attachment->dev, sg->sgl, sg->nents, dir);
104 i915_gem_object_unpin_pages(obj);
106 mutex_unlock(&obj->base.dev->struct_mutex);
109 static void *i915_gem_dmabuf_vmap(struct dma_buf *dma_buf)
111 struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf);
112 struct drm_device *dev = obj->base.dev;
113 struct sg_page_iter sg_iter;
117 ret = i915_mutex_lock_interruptible(dev);
121 if (obj->dma_buf_vmapping) {
122 obj->vmapping_count++;
126 ret = i915_gem_object_get_pages(obj);
130 i915_gem_object_pin_pages(obj);
134 pages = drm_malloc_ab(obj->base.size >> PAGE_SHIFT, sizeof(*pages));
139 for_each_sg_page(obj->pages->sgl, &sg_iter, obj->pages->nents, 0)
140 pages[i++] = sg_page_iter_page(&sg_iter);
142 obj->dma_buf_vmapping = vmap(pages, i, 0, PAGE_KERNEL);
143 drm_free_large(pages);
145 if (!obj->dma_buf_vmapping)
148 obj->vmapping_count = 1;
150 mutex_unlock(&dev->struct_mutex);
151 return obj->dma_buf_vmapping;
154 i915_gem_object_unpin_pages(obj);
156 mutex_unlock(&dev->struct_mutex);
160 static void i915_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr)
162 struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf);
163 struct drm_device *dev = obj->base.dev;
166 ret = i915_mutex_lock_interruptible(dev);
170 if (--obj->vmapping_count == 0) {
171 vunmap(obj->dma_buf_vmapping);
172 obj->dma_buf_vmapping = NULL;
174 i915_gem_object_unpin_pages(obj);
176 mutex_unlock(&dev->struct_mutex);
179 static void *i915_gem_dmabuf_kmap_atomic(struct dma_buf *dma_buf, unsigned long page_num)
184 static void i915_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf, unsigned long page_num, void *addr)
188 static void *i915_gem_dmabuf_kmap(struct dma_buf *dma_buf, unsigned long page_num)
193 static void i915_gem_dmabuf_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr)
198 static int i915_gem_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma)
203 static int i915_gem_begin_cpu_access(struct dma_buf *dma_buf, size_t start, size_t length, enum dma_data_direction direction)
205 struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf);
206 struct drm_device *dev = obj->base.dev;
208 bool write = (direction == DMA_BIDIRECTIONAL || direction == DMA_TO_DEVICE);
210 ret = i915_mutex_lock_interruptible(dev);
214 ret = i915_gem_object_set_to_cpu_domain(obj, write);
215 mutex_unlock(&dev->struct_mutex);
219 static const struct dma_buf_ops i915_dmabuf_ops = {
220 .map_dma_buf = i915_gem_map_dma_buf,
221 .unmap_dma_buf = i915_gem_unmap_dma_buf,
222 .release = drm_gem_dmabuf_release,
223 .kmap = i915_gem_dmabuf_kmap,
224 .kmap_atomic = i915_gem_dmabuf_kmap_atomic,
225 .kunmap = i915_gem_dmabuf_kunmap,
226 .kunmap_atomic = i915_gem_dmabuf_kunmap_atomic,
227 .mmap = i915_gem_dmabuf_mmap,
228 .vmap = i915_gem_dmabuf_vmap,
229 .vunmap = i915_gem_dmabuf_vunmap,
230 .begin_cpu_access = i915_gem_begin_cpu_access,
233 struct dma_buf *i915_gem_prime_export(struct drm_device *dev,
234 struct drm_gem_object *gem_obj, int flags)
236 return dma_buf_export(gem_obj, &i915_dmabuf_ops, gem_obj->size, flags);
239 static int i915_gem_object_get_pages_dmabuf(struct drm_i915_gem_object *obj)
243 sg = dma_buf_map_attachment(obj->base.import_attach, DMA_BIDIRECTIONAL);
248 obj->has_dma_mapping = true;
252 static void i915_gem_object_put_pages_dmabuf(struct drm_i915_gem_object *obj)
254 dma_buf_unmap_attachment(obj->base.import_attach,
255 obj->pages, DMA_BIDIRECTIONAL);
256 obj->has_dma_mapping = false;
259 static const struct drm_i915_gem_object_ops i915_gem_object_dmabuf_ops = {
260 .get_pages = i915_gem_object_get_pages_dmabuf,
261 .put_pages = i915_gem_object_put_pages_dmabuf,
264 struct drm_gem_object *i915_gem_prime_import(struct drm_device *dev,
265 struct dma_buf *dma_buf)
267 struct dma_buf_attachment *attach;
268 struct drm_i915_gem_object *obj;
271 /* is this one of own objects? */
272 if (dma_buf->ops == &i915_dmabuf_ops) {
273 obj = dma_buf_to_obj(dma_buf);
274 /* is it from our device? */
275 if (obj->base.dev == dev) {
277 * Importing dmabuf exported from out own gem increases
278 * refcount on gem itself instead of f_count of dmabuf.
280 drm_gem_object_reference(&obj->base);
286 attach = dma_buf_attach(dma_buf, dev->dev);
288 return ERR_CAST(attach);
290 get_dma_buf(dma_buf);
292 obj = i915_gem_object_alloc(dev);
298 drm_gem_private_object_init(dev, &obj->base, dma_buf->size);
299 i915_gem_object_init(obj, &i915_gem_object_dmabuf_ops);
300 obj->base.import_attach = attach;
305 dma_buf_detach(dma_buf, attach);
306 dma_buf_put(dma_buf);