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1/*
2 * drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c
3 *
4 * Copyright (C) 2011 Texas Instruments
5 * Author: Rob Clark <rob.clark@linaro.org>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 as published by
9 * the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * more details.
15 *
16 * You should have received a copy of the GNU General Public License along with
17 * this program. If not, see <http://www.gnu.org/licenses/>.
18 */
19
20#include <linux/dma-buf.h>
21
22#include "omap_drv.h"
23
24/* -----------------------------------------------------------------------------
25 * DMABUF Export
26 */
27
28static struct sg_table *omap_gem_map_dma_buf(
29 struct dma_buf_attachment *attachment,
30 enum dma_data_direction dir)
31{
32 struct drm_gem_object *obj = attachment->dmabuf->priv;
33 struct sg_table *sg;
34 dma_addr_t paddr;
35 int ret;
36
37 sg = kzalloc(sizeof(*sg), GFP_KERNEL);
38 if (!sg)
39 return ERR_PTR(-ENOMEM);
40
41 /* camera, etc, need physically contiguous.. but we need a
42 * better way to know this..
43 */
44 ret = omap_gem_get_paddr(obj, &paddr, true);
45 if (ret)
46 goto out;
47
48 ret = sg_alloc_table(sg, 1, GFP_KERNEL);
49 if (ret)
50 goto out;
51
52 sg_init_table(sg->sgl, 1);
53 sg_dma_len(sg->sgl) = obj->size;
54 sg_set_page(sg->sgl, pfn_to_page(PFN_DOWN(paddr)), obj->size, 0);
55 sg_dma_address(sg->sgl) = paddr;
56
57 /* this should be after _get_paddr() to ensure we have pages attached */
58 omap_gem_dma_sync(obj, dir);
59
60 return sg;
61out:
62 kfree(sg);
63 return ERR_PTR(ret);
64}
65
66static void omap_gem_unmap_dma_buf(struct dma_buf_attachment *attachment,
67 struct sg_table *sg, enum dma_data_direction dir)
68{
69 struct drm_gem_object *obj = attachment->dmabuf->priv;
70 omap_gem_put_paddr(obj);
71 sg_free_table(sg);
72 kfree(sg);
73}
74
75static void omap_gem_dmabuf_release(struct dma_buf *buffer)
76{
77 struct drm_gem_object *obj = buffer->priv;
78 /* release reference that was taken when dmabuf was exported
79 * in omap_gem_prime_set()..
80 */
81 drm_gem_object_unreference_unlocked(obj);
82}
83
84
85static int omap_gem_dmabuf_begin_cpu_access(struct dma_buf *buffer,
86 enum dma_data_direction dir)
87{
88 struct drm_gem_object *obj = buffer->priv;
89 struct page **pages;
90 if (omap_gem_flags(obj) & OMAP_BO_TILED) {
91 /* TODO we would need to pin at least part of the buffer to
92 * get de-tiled view. For now just reject it.
93 */
94 return -ENOMEM;
95 }
96 /* make sure we have the pages: */
97 return omap_gem_get_pages(obj, &pages, true);
98}
99
100static int omap_gem_dmabuf_end_cpu_access(struct dma_buf *buffer,
101 enum dma_data_direction dir)
102{
103 struct drm_gem_object *obj = buffer->priv;
104 omap_gem_put_pages(obj);
105 return 0;
106}
107
108
109static void *omap_gem_dmabuf_kmap_atomic(struct dma_buf *buffer,
110 unsigned long page_num)
111{
112 struct drm_gem_object *obj = buffer->priv;
113 struct page **pages;
114 omap_gem_get_pages(obj, &pages, false);
115 omap_gem_cpu_sync(obj, page_num);
116 return kmap_atomic(pages[page_num]);
117}
118
119static void omap_gem_dmabuf_kunmap_atomic(struct dma_buf *buffer,
120 unsigned long page_num, void *addr)
121{
122 kunmap_atomic(addr);
123}
124
125static void *omap_gem_dmabuf_kmap(struct dma_buf *buffer,
126 unsigned long page_num)
127{
128 struct drm_gem_object *obj = buffer->priv;
129 struct page **pages;
130 omap_gem_get_pages(obj, &pages, false);
131 omap_gem_cpu_sync(obj, page_num);
132 return kmap(pages[page_num]);
133}
134
135static void omap_gem_dmabuf_kunmap(struct dma_buf *buffer,
136 unsigned long page_num, void *addr)
137{
138 struct drm_gem_object *obj = buffer->priv;
139 struct page **pages;
140 omap_gem_get_pages(obj, &pages, false);
141 kunmap(pages[page_num]);
142}
143
144static int omap_gem_dmabuf_mmap(struct dma_buf *buffer,
145 struct vm_area_struct *vma)
146{
147 struct drm_gem_object *obj = buffer->priv;
148 int ret = 0;
149
150 if (WARN_ON(!obj->filp))
151 return -EINVAL;
152
153 ret = drm_gem_mmap_obj(obj, omap_gem_mmap_size(obj), vma);
154 if (ret < 0)
155 return ret;
156
157 return omap_gem_mmap_obj(obj, vma);
158}
159
160static struct dma_buf_ops omap_dmabuf_ops = {
161 .map_dma_buf = omap_gem_map_dma_buf,
162 .unmap_dma_buf = omap_gem_unmap_dma_buf,
163 .release = omap_gem_dmabuf_release,
164 .begin_cpu_access = omap_gem_dmabuf_begin_cpu_access,
165 .end_cpu_access = omap_gem_dmabuf_end_cpu_access,
166 .kmap_atomic = omap_gem_dmabuf_kmap_atomic,
167 .kunmap_atomic = omap_gem_dmabuf_kunmap_atomic,
168 .kmap = omap_gem_dmabuf_kmap,
169 .kunmap = omap_gem_dmabuf_kunmap,
170 .mmap = omap_gem_dmabuf_mmap,
171};
172
173struct dma_buf *omap_gem_prime_export(struct drm_device *dev,
174 struct drm_gem_object *obj, int flags)
175{
176 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
177
178 exp_info.ops = &omap_dmabuf_ops;
179 exp_info.size = obj->size;
180 exp_info.flags = flags;
181 exp_info.priv = obj;
182
183 return dma_buf_export(&exp_info);
184}
185
186/* -----------------------------------------------------------------------------
187 * DMABUF Import
188 */
189
190struct drm_gem_object *omap_gem_prime_import(struct drm_device *dev,
191 struct dma_buf *dma_buf)
192{
193 struct dma_buf_attachment *attach;
194 struct drm_gem_object *obj;
195 struct sg_table *sgt;
196 int ret;
197
198 if (dma_buf->ops == &omap_dmabuf_ops) {
199 obj = dma_buf->priv;
200 if (obj->dev == dev) {
201 /*
202 * Importing dmabuf exported from out own gem increases
203 * refcount on gem itself instead of f_count of dmabuf.
204 */
205 drm_gem_object_reference(obj);
206 return obj;
207 }
208 }
209
210 attach = dma_buf_attach(dma_buf, dev->dev);
211 if (IS_ERR(attach))
212 return ERR_CAST(attach);
213
214 get_dma_buf(dma_buf);
215
216 sgt = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
217 if (IS_ERR(sgt)) {
218 ret = PTR_ERR(sgt);
219 goto fail_detach;
220 }
221
222 obj = omap_gem_new_dmabuf(dev, dma_buf->size, sgt);
223 if (IS_ERR(obj)) {
224 ret = PTR_ERR(obj);
225 goto fail_unmap;
226 }
227
228 obj->import_attach = attach;
229
230 return obj;
231
232fail_unmap:
233 dma_buf_unmap_attachment(attach, sgt, DMA_BIDIRECTIONAL);
234fail_detach:
235 dma_buf_detach(dma_buf, attach);
236 dma_buf_put(dma_buf);
237
238 return ERR_PTR(ret);
239}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2011 Texas Instruments Incorporated - https://www.ti.com/
4 * Author: Rob Clark <rob.clark@linaro.org>
5 */
6
7#include <linux/dma-buf.h>
8#include <linux/highmem.h>
9
10#include <drm/drm_prime.h>
11
12#include "omap_drv.h"
13
14MODULE_IMPORT_NS(DMA_BUF);
15
16/* -----------------------------------------------------------------------------
17 * DMABUF Export
18 */
19
20static struct sg_table *omap_gem_map_dma_buf(
21 struct dma_buf_attachment *attachment,
22 enum dma_data_direction dir)
23{
24 struct drm_gem_object *obj = attachment->dmabuf->priv;
25 struct sg_table *sg;
26 sg = omap_gem_get_sg(obj, dir);
27 if (IS_ERR(sg))
28 return sg;
29
30 return sg;
31}
32
33static void omap_gem_unmap_dma_buf(struct dma_buf_attachment *attachment,
34 struct sg_table *sg, enum dma_data_direction dir)
35{
36 struct drm_gem_object *obj = attachment->dmabuf->priv;
37 omap_gem_put_sg(obj, sg);
38}
39
40static int omap_gem_dmabuf_begin_cpu_access(struct dma_buf *buffer,
41 enum dma_data_direction dir)
42{
43 struct drm_gem_object *obj = buffer->priv;
44 struct page **pages;
45 if (omap_gem_flags(obj) & OMAP_BO_TILED_MASK) {
46 /* TODO we would need to pin at least part of the buffer to
47 * get de-tiled view. For now just reject it.
48 */
49 return -ENOMEM;
50 }
51 /* make sure we have the pages: */
52 return omap_gem_get_pages(obj, &pages, true);
53}
54
55static int omap_gem_dmabuf_end_cpu_access(struct dma_buf *buffer,
56 enum dma_data_direction dir)
57{
58 struct drm_gem_object *obj = buffer->priv;
59 omap_gem_put_pages(obj);
60 return 0;
61}
62
63static int omap_gem_dmabuf_mmap(struct dma_buf *buffer,
64 struct vm_area_struct *vma)
65{
66 struct drm_gem_object *obj = buffer->priv;
67 int ret = 0;
68
69 dma_resv_assert_held(buffer->resv);
70
71 ret = drm_gem_mmap_obj(obj, omap_gem_mmap_size(obj), vma);
72 if (ret < 0)
73 return ret;
74
75 return omap_gem_mmap_obj(obj, vma);
76}
77
78static const struct dma_buf_ops omap_dmabuf_ops = {
79 .map_dma_buf = omap_gem_map_dma_buf,
80 .unmap_dma_buf = omap_gem_unmap_dma_buf,
81 .release = drm_gem_dmabuf_release,
82 .begin_cpu_access = omap_gem_dmabuf_begin_cpu_access,
83 .end_cpu_access = omap_gem_dmabuf_end_cpu_access,
84 .mmap = omap_gem_dmabuf_mmap,
85};
86
87struct dma_buf *omap_gem_prime_export(struct drm_gem_object *obj, int flags)
88{
89 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
90
91 exp_info.ops = &omap_dmabuf_ops;
92 exp_info.size = omap_gem_mmap_size(obj);
93 exp_info.flags = flags;
94 exp_info.priv = obj;
95 exp_info.resv = obj->resv;
96
97 return drm_gem_dmabuf_export(obj->dev, &exp_info);
98}
99
100/* -----------------------------------------------------------------------------
101 * DMABUF Import
102 */
103
104struct drm_gem_object *omap_gem_prime_import(struct drm_device *dev,
105 struct dma_buf *dma_buf)
106{
107 struct dma_buf_attachment *attach;
108 struct drm_gem_object *obj;
109 struct sg_table *sgt;
110 int ret;
111
112 if (dma_buf->ops == &omap_dmabuf_ops) {
113 obj = dma_buf->priv;
114 if (obj->dev == dev) {
115 /*
116 * Importing dmabuf exported from out own gem increases
117 * refcount on gem itself instead of f_count of dmabuf.
118 */
119 drm_gem_object_get(obj);
120 return obj;
121 }
122 }
123
124 attach = dma_buf_attach(dma_buf, dev->dev);
125 if (IS_ERR(attach))
126 return ERR_CAST(attach);
127
128 get_dma_buf(dma_buf);
129
130 sgt = dma_buf_map_attachment_unlocked(attach, DMA_TO_DEVICE);
131 if (IS_ERR(sgt)) {
132 ret = PTR_ERR(sgt);
133 goto fail_detach;
134 }
135
136 obj = omap_gem_new_dmabuf(dev, dma_buf->size, sgt);
137 if (IS_ERR(obj)) {
138 ret = PTR_ERR(obj);
139 goto fail_unmap;
140 }
141
142 obj->import_attach = attach;
143
144 return obj;
145
146fail_unmap:
147 dma_buf_unmap_attachment_unlocked(attach, sgt, DMA_TO_DEVICE);
148fail_detach:
149 dma_buf_detach(dma_buf, attach);
150 dma_buf_put(dma_buf);
151
152 return ERR_PTR(ret);
153}