blob: c6dfc1466e3a1ec2c775ea1b178e3dbce20858e7 [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
Dave Airlie6a101cb2012-05-23 14:09:32 +010030static struct sg_table *i915_gem_map_dma_buf(struct dma_buf_attachment *attachment,
Chris Wilson9da3da62012-06-01 15:20:22 +010031 enum dma_data_direction dir)
Daniel Vetter1286ff72012-05-10 15:25:09 +020032{
33 struct drm_i915_gem_object *obj = attachment->dmabuf->priv;
Chris Wilson9da3da62012-06-01 15:20:22 +010034 struct sg_table *st;
35 struct scatterlist *src, *dst;
36 int ret, i;
Daniel Vetter1286ff72012-05-10 15:25:09 +020037
Chris Wilson9da3da62012-06-01 15:20:22 +010038 ret = i915_mutex_lock_interruptible(obj->base.dev);
Daniel Vetter1286ff72012-05-10 15:25:09 +020039 if (ret)
40 return ERR_PTR(ret);
41
Chris Wilson37e680a2012-06-07 15:38:42 +010042 ret = i915_gem_object_get_pages(obj);
Chris Wilson6c085a72012-08-20 11:40:46 +020043 if (ret) {
Chris Wilson9da3da62012-06-01 15:20:22 +010044 st = ERR_PTR(ret);
Chris Wilson6c085a72012-08-20 11:40:46 +020045 goto out;
Daniel Vetter1286ff72012-05-10 15:25:09 +020046 }
47
Chris Wilson9da3da62012-06-01 15:20:22 +010048 /* Copy sg so that we make an independent mapping */
49 st = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
50 if (st == NULL) {
51 st = ERR_PTR(-ENOMEM);
52 goto out;
53 }
54
55 ret = sg_alloc_table(st, obj->pages->nents, GFP_KERNEL);
56 if (ret) {
57 kfree(st);
58 st = ERR_PTR(ret);
59 goto out;
60 }
61
62 src = obj->pages->sgl;
63 dst = st->sgl;
64 for (i = 0; i < obj->pages->nents; i++) {
Imre Deak67d5a502013-02-18 19:28:02 +020065 sg_set_page(dst, sg_page(src), src->length, 0);
Chris Wilson9da3da62012-06-01 15:20:22 +010066 dst = sg_next(dst);
67 src = sg_next(src);
68 }
69
70 if (!dma_map_sg(attachment->dev, st->sgl, st->nents, dir)) {
71 sg_free_table(st);
72 kfree(st);
73 st = ERR_PTR(-ENOMEM);
74 goto out;
75 }
76
Chris Wilsona5570172012-09-04 21:02:54 +010077 i915_gem_object_pin_pages(obj);
78
Daniel Vetter1286ff72012-05-10 15:25:09 +020079out:
Chris Wilson9da3da62012-06-01 15:20:22 +010080 mutex_unlock(&obj->base.dev->struct_mutex);
81 return st;
Daniel Vetter1286ff72012-05-10 15:25:09 +020082}
83
Dave Airlie6a101cb2012-05-23 14:09:32 +010084static void i915_gem_unmap_dma_buf(struct dma_buf_attachment *attachment,
Chris Wilson2f745ad2012-09-04 21:02:58 +010085 struct sg_table *sg,
86 enum dma_data_direction dir)
Daniel Vetter1286ff72012-05-10 15:25:09 +020087{
88 dma_unmap_sg(attachment->dev, sg->sgl, sg->nents, dir);
89 sg_free_table(sg);
90 kfree(sg);
91}
92
Dave Airlie6a101cb2012-05-23 14:09:32 +010093static void i915_gem_dmabuf_release(struct dma_buf *dma_buf)
Daniel Vetter1286ff72012-05-10 15:25:09 +020094{
95 struct drm_i915_gem_object *obj = dma_buf->priv;
96
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);
101 }
102}
103
Dave Airlie9a70cc22012-05-22 13:09:21 +0100104static void *i915_gem_dmabuf_vmap(struct dma_buf *dma_buf)
105{
106 struct drm_i915_gem_object *obj = dma_buf->priv;
107 struct drm_device *dev = obj->base.dev;
Imre Deak67d5a502013-02-18 19:28:02 +0200108 struct sg_page_iter sg_iter;
Chris Wilson9da3da62012-06-01 15:20:22 +0100109 struct page **pages;
110 int ret, i;
Dave Airlie9a70cc22012-05-22 13:09:21 +0100111
112 ret = i915_mutex_lock_interruptible(dev);
113 if (ret)
114 return ERR_PTR(ret);
115
116 if (obj->dma_buf_vmapping) {
117 obj->vmapping_count++;
118 goto out_unlock;
119 }
120
Chris Wilson37e680a2012-06-07 15:38:42 +0100121 ret = i915_gem_object_get_pages(obj);
Chris Wilson9da3da62012-06-01 15:20:22 +0100122 if (ret)
123 goto error;
Dave Airlie9a70cc22012-05-22 13:09:21 +0100124
Chris Wilson9da3da62012-06-01 15:20:22 +0100125 ret = -ENOMEM;
126
Imre Deak67d5a502013-02-18 19:28:02 +0200127 pages = drm_malloc_ab(obj->base.size >> PAGE_SHIFT, sizeof(*pages));
Chris Wilson9da3da62012-06-01 15:20:22 +0100128 if (pages == NULL)
129 goto error;
130
Imre Deak67d5a502013-02-18 19:28:02 +0200131 i = 0;
132 for_each_sg_page(obj->pages->sgl, &sg_iter, obj->pages->nents, 0);
Imre Deak2db76d72013-03-26 15:14:18 +0200133 pages[i++] = sg_page_iter_page(&sg_iter);
Chris Wilson9da3da62012-06-01 15:20:22 +0100134
Imre Deak67d5a502013-02-18 19:28:02 +0200135 obj->dma_buf_vmapping = vmap(pages, i, 0, PAGE_KERNEL);
Chris Wilson9da3da62012-06-01 15:20:22 +0100136 drm_free_large(pages);
137
138 if (!obj->dma_buf_vmapping)
139 goto error;
Dave Airlie9a70cc22012-05-22 13:09:21 +0100140
141 obj->vmapping_count = 1;
Chris Wilsona5570172012-09-04 21:02:54 +0100142 i915_gem_object_pin_pages(obj);
Dave Airlie9a70cc22012-05-22 13:09:21 +0100143out_unlock:
144 mutex_unlock(&dev->struct_mutex);
145 return obj->dma_buf_vmapping;
Chris Wilson9da3da62012-06-01 15:20:22 +0100146
147error:
148 mutex_unlock(&dev->struct_mutex);
149 return ERR_PTR(ret);
Dave Airlie9a70cc22012-05-22 13:09:21 +0100150}
151
152static void i915_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr)
153{
154 struct drm_i915_gem_object *obj = dma_buf->priv;
155 struct drm_device *dev = obj->base.dev;
156 int ret;
157
158 ret = i915_mutex_lock_interruptible(dev);
159 if (ret)
160 return;
161
Chris Wilsona5570172012-09-04 21:02:54 +0100162 if (--obj->vmapping_count == 0) {
Dave Airlie9a70cc22012-05-22 13:09:21 +0100163 vunmap(obj->dma_buf_vmapping);
164 obj->dma_buf_vmapping = NULL;
Chris Wilsona5570172012-09-04 21:02:54 +0100165
166 i915_gem_object_unpin_pages(obj);
Dave Airlie9a70cc22012-05-22 13:09:21 +0100167 }
168 mutex_unlock(&dev->struct_mutex);
169}
170
Daniel Vetter1286ff72012-05-10 15:25:09 +0200171static void *i915_gem_dmabuf_kmap_atomic(struct dma_buf *dma_buf, unsigned long page_num)
172{
173 return NULL;
174}
175
176static void i915_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf, unsigned long page_num, void *addr)
177{
178
179}
180static void *i915_gem_dmabuf_kmap(struct dma_buf *dma_buf, unsigned long page_num)
181{
182 return NULL;
183}
184
185static void i915_gem_dmabuf_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr)
186{
187
188}
189
Dave Airlie2dad9d42012-05-29 15:11:22 +0100190static int i915_gem_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma)
191{
192 return -EINVAL;
193}
194
Dave Airlieec6f1bb2012-08-16 10:15:34 +1000195static int i915_gem_begin_cpu_access(struct dma_buf *dma_buf, size_t start, size_t length, enum dma_data_direction direction)
196{
197 struct drm_i915_gem_object *obj = dma_buf->priv;
198 struct drm_device *dev = obj->base.dev;
199 int ret;
200 bool write = (direction == DMA_BIDIRECTIONAL || direction == DMA_TO_DEVICE);
201
202 ret = i915_mutex_lock_interruptible(dev);
203 if (ret)
204 return ret;
205
206 ret = i915_gem_object_set_to_cpu_domain(obj, write);
207 mutex_unlock(&dev->struct_mutex);
208 return ret;
209}
210
Dave Airlie6a101cb2012-05-23 14:09:32 +0100211static const struct dma_buf_ops i915_dmabuf_ops = {
Daniel Vetter1286ff72012-05-10 15:25:09 +0200212 .map_dma_buf = i915_gem_map_dma_buf,
213 .unmap_dma_buf = i915_gem_unmap_dma_buf,
214 .release = i915_gem_dmabuf_release,
215 .kmap = i915_gem_dmabuf_kmap,
216 .kmap_atomic = i915_gem_dmabuf_kmap_atomic,
217 .kunmap = i915_gem_dmabuf_kunmap,
218 .kunmap_atomic = i915_gem_dmabuf_kunmap_atomic,
Dave Airlie2dad9d42012-05-29 15:11:22 +0100219 .mmap = i915_gem_dmabuf_mmap,
Dave Airlie9a70cc22012-05-22 13:09:21 +0100220 .vmap = i915_gem_dmabuf_vmap,
221 .vunmap = i915_gem_dmabuf_vunmap,
Dave Airlieec6f1bb2012-08-16 10:15:34 +1000222 .begin_cpu_access = i915_gem_begin_cpu_access,
Daniel Vetter1286ff72012-05-10 15:25:09 +0200223};
224
225struct dma_buf *i915_gem_prime_export(struct drm_device *dev,
Chris Wilson9da3da62012-06-01 15:20:22 +0100226 struct drm_gem_object *gem_obj, int flags)
Daniel Vetter1286ff72012-05-10 15:25:09 +0200227{
228 struct drm_i915_gem_object *obj = to_intel_bo(gem_obj);
229
Dave Airlie5b424272012-12-20 10:51:09 +1000230 return dma_buf_export(obj, &i915_dmabuf_ops, obj->base.size, flags);
Daniel Vetter1286ff72012-05-10 15:25:09 +0200231}
232
Chris Wilson2f745ad2012-09-04 21:02:58 +0100233static int i915_gem_object_get_pages_dmabuf(struct drm_i915_gem_object *obj)
234{
235 struct sg_table *sg;
236
237 sg = dma_buf_map_attachment(obj->base.import_attach, DMA_BIDIRECTIONAL);
238 if (IS_ERR(sg))
239 return PTR_ERR(sg);
240
241 obj->pages = sg;
242 obj->has_dma_mapping = true;
243 return 0;
244}
245
246static void i915_gem_object_put_pages_dmabuf(struct drm_i915_gem_object *obj)
247{
248 dma_buf_unmap_attachment(obj->base.import_attach,
249 obj->pages, DMA_BIDIRECTIONAL);
250 obj->has_dma_mapping = false;
251}
252
253static const struct drm_i915_gem_object_ops i915_gem_object_dmabuf_ops = {
254 .get_pages = i915_gem_object_get_pages_dmabuf,
255 .put_pages = i915_gem_object_put_pages_dmabuf,
256};
257
Daniel Vetter1286ff72012-05-10 15:25:09 +0200258struct drm_gem_object *i915_gem_prime_import(struct drm_device *dev,
Chris Wilson9da3da62012-06-01 15:20:22 +0100259 struct dma_buf *dma_buf)
Daniel Vetter1286ff72012-05-10 15:25:09 +0200260{
261 struct dma_buf_attachment *attach;
Daniel Vetter1286ff72012-05-10 15:25:09 +0200262 struct drm_i915_gem_object *obj;
Daniel Vetter1286ff72012-05-10 15:25:09 +0200263 int ret;
264
265 /* is this one of own objects? */
266 if (dma_buf->ops == &i915_dmabuf_ops) {
267 obj = dma_buf->priv;
268 /* is it from our device? */
269 if (obj->base.dev == dev) {
Seung-Woo Kimbe8a42a2012-09-27 15:30:06 +0900270 /*
271 * Importing dmabuf exported from out own gem increases
272 * refcount on gem itself instead of f_count of dmabuf.
273 */
Daniel Vetter1286ff72012-05-10 15:25:09 +0200274 drm_gem_object_reference(&obj->base);
Seung-Woo Kimbe8a42a2012-09-27 15:30:06 +0900275 dma_buf_put(dma_buf);
Daniel Vetter1286ff72012-05-10 15:25:09 +0200276 return &obj->base;
277 }
278 }
279
280 /* need to attach */
281 attach = dma_buf_attach(dma_buf, dev->dev);
282 if (IS_ERR(attach))
283 return ERR_CAST(attach);
284
Chris Wilson42dcedd2012-11-15 11:32:30 +0000285 obj = i915_gem_object_alloc(dev);
Daniel Vetter1286ff72012-05-10 15:25:09 +0200286 if (obj == NULL) {
287 ret = -ENOMEM;
Chris Wilson2f745ad2012-09-04 21:02:58 +0100288 goto fail_detach;
Daniel Vetter1286ff72012-05-10 15:25:09 +0200289 }
290
Chris Wilson9da3da62012-06-01 15:20:22 +0100291 ret = drm_gem_private_object_init(dev, &obj->base, dma_buf->size);
Daniel Vetter1286ff72012-05-10 15:25:09 +0200292 if (ret) {
Chris Wilson42dcedd2012-11-15 11:32:30 +0000293 i915_gem_object_free(obj);
Chris Wilson2f745ad2012-09-04 21:02:58 +0100294 goto fail_detach;
Daniel Vetter1286ff72012-05-10 15:25:09 +0200295 }
296
Chris Wilson2f745ad2012-09-04 21:02:58 +0100297 i915_gem_object_init(obj, &i915_gem_object_dmabuf_ops);
Daniel Vetter1286ff72012-05-10 15:25:09 +0200298 obj->base.import_attach = attach;
299
300 return &obj->base;
301
Daniel Vetter1286ff72012-05-10 15:25:09 +0200302fail_detach:
303 dma_buf_detach(dma_buf, attach);
304 return ERR_PTR(ret);
305}