blob: 7d5752fda5f18b7850beeed588a6f1b3a85cd79a [file] [log] [blame]
Daniel Vetter1286ff72012-05-10 15:25:09 +02001/*
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 */
David Howells760285e2012-10-02 18:01:07 +010026#include <drm/drmP.h>
Daniel Vetter1286ff72012-05-10 15:25:09 +020027#include "i915_drv.h"
28#include <linux/dma-buf.h>
29
Daniel Vetter608806a2013-08-08 09:10:38 +020030static struct drm_i915_gem_object *dma_buf_to_obj(struct dma_buf *buf)
31{
32 return to_intel_bo(buf->priv);
33}
34
Dave Airlie6a101cb2012-05-23 14:09:32 +010035static struct sg_table *i915_gem_map_dma_buf(struct dma_buf_attachment *attachment,
Chris Wilson9da3da62012-06-01 15:20:22 +010036 enum dma_data_direction dir)
Daniel Vetter1286ff72012-05-10 15:25:09 +020037{
Daniel Vetter608806a2013-08-08 09:10:38 +020038 struct drm_i915_gem_object *obj = dma_buf_to_obj(attachment->dmabuf);
Chris Wilson9da3da62012-06-01 15:20:22 +010039 struct sg_table *st;
40 struct scatterlist *src, *dst;
41 int ret, i;
Daniel Vetter1286ff72012-05-10 15:25:09 +020042
Chris Wilson9da3da62012-06-01 15:20:22 +010043 ret = i915_mutex_lock_interruptible(obj->base.dev);
Daniel Vetter1286ff72012-05-10 15:25:09 +020044 if (ret)
Chris Wilson5cfacde2013-08-26 19:50:55 -030045 goto err;
Daniel Vetter1286ff72012-05-10 15:25:09 +020046
Chris Wilson37e680a2012-06-07 15:38:42 +010047 ret = i915_gem_object_get_pages(obj);
Chris Wilson5cfacde2013-08-26 19:50:55 -030048 if (ret)
49 goto err_unlock;
50
51 i915_gem_object_pin_pages(obj);
Daniel Vetter1286ff72012-05-10 15:25:09 +020052
Chris Wilson9da3da62012-06-01 15:20:22 +010053 /* Copy sg so that we make an independent mapping */
54 st = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
55 if (st == NULL) {
Chris Wilson5cfacde2013-08-26 19:50:55 -030056 ret = -ENOMEM;
57 goto err_unpin;
Chris Wilson9da3da62012-06-01 15:20:22 +010058 }
59
60 ret = sg_alloc_table(st, obj->pages->nents, GFP_KERNEL);
Chris Wilson5cfacde2013-08-26 19:50:55 -030061 if (ret)
62 goto err_free;
Chris Wilson9da3da62012-06-01 15:20:22 +010063
64 src = obj->pages->sgl;
65 dst = st->sgl;
66 for (i = 0; i < obj->pages->nents; i++) {
Imre Deak67d5a502013-02-18 19:28:02 +020067 sg_set_page(dst, sg_page(src), src->length, 0);
Chris Wilson9da3da62012-06-01 15:20:22 +010068 dst = sg_next(dst);
69 src = sg_next(src);
70 }
71
72 if (!dma_map_sg(attachment->dev, st->sgl, st->nents, dir)) {
Chris Wilson5cfacde2013-08-26 19:50:55 -030073 ret =-ENOMEM;
74 goto err_free_sg;
Chris Wilson9da3da62012-06-01 15:20:22 +010075 }
76
Chris Wilson9da3da62012-06-01 15:20:22 +010077 mutex_unlock(&obj->base.dev->struct_mutex);
78 return st;
Chris Wilson5cfacde2013-08-26 19:50:55 -030079
80err_free_sg:
81 sg_free_table(st);
82err_free:
83 kfree(st);
84err_unpin:
85 i915_gem_object_unpin_pages(obj);
86err_unlock:
87 mutex_unlock(&obj->base.dev->struct_mutex);
88err:
89 return ERR_PTR(ret);
Daniel Vetter1286ff72012-05-10 15:25:09 +020090}
91
Dave Airlie6a101cb2012-05-23 14:09:32 +010092static void i915_gem_unmap_dma_buf(struct dma_buf_attachment *attachment,
Chris Wilson2f745ad2012-09-04 21:02:58 +010093 struct sg_table *sg,
94 enum dma_data_direction dir)
Daniel Vetter1286ff72012-05-10 15:25:09 +020095{
Daniel Vetter608806a2013-08-08 09:10:38 +020096 struct drm_i915_gem_object *obj = dma_buf_to_obj(attachment->dmabuf);
Daniel Vetterf2142662013-08-08 09:10:37 +020097
98 mutex_lock(&obj->base.dev->struct_mutex);
99
Daniel Vetter1286ff72012-05-10 15:25:09 +0200100 dma_unmap_sg(attachment->dev, sg->sgl, sg->nents, dir);
101 sg_free_table(sg);
102 kfree(sg);
Daniel Vetterf2142662013-08-08 09:10:37 +0200103
104 i915_gem_object_unpin_pages(obj);
105
106 mutex_unlock(&obj->base.dev->struct_mutex);
Daniel Vetter1286ff72012-05-10 15:25:09 +0200107}
108
Dave Airlie9a70cc22012-05-22 13:09:21 +0100109static void *i915_gem_dmabuf_vmap(struct dma_buf *dma_buf)
110{
Daniel Vetter608806a2013-08-08 09:10:38 +0200111 struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf);
Dave Airlie9a70cc22012-05-22 13:09:21 +0100112 struct drm_device *dev = obj->base.dev;
Imre Deak67d5a502013-02-18 19:28:02 +0200113 struct sg_page_iter sg_iter;
Chris Wilson9da3da62012-06-01 15:20:22 +0100114 struct page **pages;
115 int ret, i;
Dave Airlie9a70cc22012-05-22 13:09:21 +0100116
117 ret = i915_mutex_lock_interruptible(dev);
118 if (ret)
119 return ERR_PTR(ret);
120
121 if (obj->dma_buf_vmapping) {
122 obj->vmapping_count++;
123 goto out_unlock;
124 }
125
Chris Wilson37e680a2012-06-07 15:38:42 +0100126 ret = i915_gem_object_get_pages(obj);
Chris Wilson9da3da62012-06-01 15:20:22 +0100127 if (ret)
128 goto error;
Dave Airlie9a70cc22012-05-22 13:09:21 +0100129
Chris Wilson9da3da62012-06-01 15:20:22 +0100130 ret = -ENOMEM;
131
Imre Deak67d5a502013-02-18 19:28:02 +0200132 pages = drm_malloc_ab(obj->base.size >> PAGE_SHIFT, sizeof(*pages));
Chris Wilson9da3da62012-06-01 15:20:22 +0100133 if (pages == NULL)
134 goto error;
135
Imre Deak67d5a502013-02-18 19:28:02 +0200136 i = 0;
Dave Airlieb11b88e2013-05-01 14:23:41 +1000137 for_each_sg_page(obj->pages->sgl, &sg_iter, obj->pages->nents, 0)
Imre Deak2db76d72013-03-26 15:14:18 +0200138 pages[i++] = sg_page_iter_page(&sg_iter);
Chris Wilson9da3da62012-06-01 15:20:22 +0100139
Imre Deak67d5a502013-02-18 19:28:02 +0200140 obj->dma_buf_vmapping = vmap(pages, i, 0, PAGE_KERNEL);
Chris Wilson9da3da62012-06-01 15:20:22 +0100141 drm_free_large(pages);
142
143 if (!obj->dma_buf_vmapping)
144 goto error;
Dave Airlie9a70cc22012-05-22 13:09:21 +0100145
146 obj->vmapping_count = 1;
Chris Wilsona5570172012-09-04 21:02:54 +0100147 i915_gem_object_pin_pages(obj);
Dave Airlie9a70cc22012-05-22 13:09:21 +0100148out_unlock:
149 mutex_unlock(&dev->struct_mutex);
150 return obj->dma_buf_vmapping;
Chris Wilson9da3da62012-06-01 15:20:22 +0100151
152error:
153 mutex_unlock(&dev->struct_mutex);
154 return ERR_PTR(ret);
Dave Airlie9a70cc22012-05-22 13:09:21 +0100155}
156
157static void i915_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr)
158{
Daniel Vetter608806a2013-08-08 09:10:38 +0200159 struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf);
Dave Airlie9a70cc22012-05-22 13:09:21 +0100160 struct drm_device *dev = obj->base.dev;
161 int ret;
162
163 ret = i915_mutex_lock_interruptible(dev);
164 if (ret)
165 return;
166
Chris Wilsona5570172012-09-04 21:02:54 +0100167 if (--obj->vmapping_count == 0) {
Dave Airlie9a70cc22012-05-22 13:09:21 +0100168 vunmap(obj->dma_buf_vmapping);
169 obj->dma_buf_vmapping = NULL;
Chris Wilsona5570172012-09-04 21:02:54 +0100170
171 i915_gem_object_unpin_pages(obj);
Dave Airlie9a70cc22012-05-22 13:09:21 +0100172 }
173 mutex_unlock(&dev->struct_mutex);
174}
175
Daniel Vetter1286ff72012-05-10 15:25:09 +0200176static void *i915_gem_dmabuf_kmap_atomic(struct dma_buf *dma_buf, unsigned long page_num)
177{
178 return NULL;
179}
180
181static void i915_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf, unsigned long page_num, void *addr)
182{
183
184}
185static void *i915_gem_dmabuf_kmap(struct dma_buf *dma_buf, unsigned long page_num)
186{
187 return NULL;
188}
189
190static void i915_gem_dmabuf_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr)
191{
192
193}
194
Dave Airlie2dad9d42012-05-29 15:11:22 +0100195static int i915_gem_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma)
196{
197 return -EINVAL;
198}
199
Dave Airlieec6f1bb2012-08-16 10:15:34 +1000200static int i915_gem_begin_cpu_access(struct dma_buf *dma_buf, size_t start, size_t length, enum dma_data_direction direction)
201{
Daniel Vetter608806a2013-08-08 09:10:38 +0200202 struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf);
Dave Airlieec6f1bb2012-08-16 10:15:34 +1000203 struct drm_device *dev = obj->base.dev;
204 int ret;
205 bool write = (direction == DMA_BIDIRECTIONAL || direction == DMA_TO_DEVICE);
206
207 ret = i915_mutex_lock_interruptible(dev);
208 if (ret)
209 return ret;
210
211 ret = i915_gem_object_set_to_cpu_domain(obj, write);
212 mutex_unlock(&dev->struct_mutex);
213 return ret;
214}
215
Dave Airlie6a101cb2012-05-23 14:09:32 +0100216static const struct dma_buf_ops i915_dmabuf_ops = {
Daniel Vetter1286ff72012-05-10 15:25:09 +0200217 .map_dma_buf = i915_gem_map_dma_buf,
218 .unmap_dma_buf = i915_gem_unmap_dma_buf,
Daniel Vetterc1d67982013-08-15 00:02:30 +0200219 .release = drm_gem_dmabuf_release,
Daniel Vetter1286ff72012-05-10 15:25:09 +0200220 .kmap = i915_gem_dmabuf_kmap,
221 .kmap_atomic = i915_gem_dmabuf_kmap_atomic,
222 .kunmap = i915_gem_dmabuf_kunmap,
223 .kunmap_atomic = i915_gem_dmabuf_kunmap_atomic,
Dave Airlie2dad9d42012-05-29 15:11:22 +0100224 .mmap = i915_gem_dmabuf_mmap,
Dave Airlie9a70cc22012-05-22 13:09:21 +0100225 .vmap = i915_gem_dmabuf_vmap,
226 .vunmap = i915_gem_dmabuf_vunmap,
Dave Airlieec6f1bb2012-08-16 10:15:34 +1000227 .begin_cpu_access = i915_gem_begin_cpu_access,
Daniel Vetter1286ff72012-05-10 15:25:09 +0200228};
229
230struct dma_buf *i915_gem_prime_export(struct drm_device *dev,
Chris Wilson9da3da62012-06-01 15:20:22 +0100231 struct drm_gem_object *gem_obj, int flags)
Daniel Vetter1286ff72012-05-10 15:25:09 +0200232{
Daniel Vetter608806a2013-08-08 09:10:38 +0200233 return dma_buf_export(gem_obj, &i915_dmabuf_ops, gem_obj->size, flags);
Daniel Vetter1286ff72012-05-10 15:25:09 +0200234}
235
Chris Wilson2f745ad2012-09-04 21:02:58 +0100236static int i915_gem_object_get_pages_dmabuf(struct drm_i915_gem_object *obj)
237{
238 struct sg_table *sg;
239
240 sg = dma_buf_map_attachment(obj->base.import_attach, DMA_BIDIRECTIONAL);
241 if (IS_ERR(sg))
242 return PTR_ERR(sg);
243
244 obj->pages = sg;
245 obj->has_dma_mapping = true;
246 return 0;
247}
248
249static void i915_gem_object_put_pages_dmabuf(struct drm_i915_gem_object *obj)
250{
251 dma_buf_unmap_attachment(obj->base.import_attach,
252 obj->pages, DMA_BIDIRECTIONAL);
253 obj->has_dma_mapping = false;
254}
255
256static const struct drm_i915_gem_object_ops i915_gem_object_dmabuf_ops = {
257 .get_pages = i915_gem_object_get_pages_dmabuf,
258 .put_pages = i915_gem_object_put_pages_dmabuf,
259};
260
Daniel Vetter1286ff72012-05-10 15:25:09 +0200261struct drm_gem_object *i915_gem_prime_import(struct drm_device *dev,
Chris Wilson9da3da62012-06-01 15:20:22 +0100262 struct dma_buf *dma_buf)
Daniel Vetter1286ff72012-05-10 15:25:09 +0200263{
264 struct dma_buf_attachment *attach;
Daniel Vetter1286ff72012-05-10 15:25:09 +0200265 struct drm_i915_gem_object *obj;
Daniel Vetter1286ff72012-05-10 15:25:09 +0200266 int ret;
267
268 /* is this one of own objects? */
269 if (dma_buf->ops == &i915_dmabuf_ops) {
Daniel Vetter608806a2013-08-08 09:10:38 +0200270 obj = dma_buf_to_obj(dma_buf);
Daniel Vetter1286ff72012-05-10 15:25:09 +0200271 /* is it from our device? */
272 if (obj->base.dev == dev) {
Seung-Woo Kimbe8a42a2012-09-27 15:30:06 +0900273 /*
274 * Importing dmabuf exported from out own gem increases
275 * refcount on gem itself instead of f_count of dmabuf.
276 */
Daniel Vetter1286ff72012-05-10 15:25:09 +0200277 drm_gem_object_reference(&obj->base);
278 return &obj->base;
279 }
280 }
281
282 /* need to attach */
283 attach = dma_buf_attach(dma_buf, dev->dev);
284 if (IS_ERR(attach))
285 return ERR_CAST(attach);
286
Imre Deak011c2282013-04-19 11:11:56 +1000287 get_dma_buf(dma_buf);
288
Chris Wilson42dcedd2012-11-15 11:32:30 +0000289 obj = i915_gem_object_alloc(dev);
Daniel Vetter1286ff72012-05-10 15:25:09 +0200290 if (obj == NULL) {
291 ret = -ENOMEM;
Chris Wilson2f745ad2012-09-04 21:02:58 +0100292 goto fail_detach;
Daniel Vetter1286ff72012-05-10 15:25:09 +0200293 }
294
David Herrmann89c82332013-07-11 11:56:32 +0200295 drm_gem_private_object_init(dev, &obj->base, dma_buf->size);
Chris Wilson2f745ad2012-09-04 21:02:58 +0100296 i915_gem_object_init(obj, &i915_gem_object_dmabuf_ops);
Daniel Vetter1286ff72012-05-10 15:25:09 +0200297 obj->base.import_attach = attach;
298
299 return &obj->base;
300
Daniel Vetter1286ff72012-05-10 15:25:09 +0200301fail_detach:
302 dma_buf_detach(dma_buf, attach);
Imre Deak011c2282013-04-19 11:11:56 +1000303 dma_buf_put(dma_buf);
304
Daniel Vetter1286ff72012-05-10 15:25:09 +0200305 return ERR_PTR(ret);
306}