1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
/**
* \file drm_dma.c
* DMA IOCTL and function support
*
* \author Rickard E. (Rik) Faith <faith@valinux.com>
* \author Gareth Hughes <gareth@valinux.com>
*/
/*
* Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com
*
* Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#include "drmP.h"
/**
* Initialize the DMA data.
*
* \param dev DRM device.
* \return zero on success or a negative value on failure.
*
* Allocate and initialize a drm_device_dma structure.
*/
int drm_dma_setup(drm_device_t * dev)
{
int i;
dev->dma = drm_alloc(sizeof(*dev->dma), DRM_MEM_DRIVER);
if (!dev->dma)
return -ENOMEM;
memset(dev->dma, 0, sizeof(*dev->dma));
for (i = 0; i <= DRM_MAX_ORDER; i++)
memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0]));
return 0;
}
/**
* Cleanup the DMA resources.
*
* \param dev DRM device.
*
* Free all pages associated with DMA buffers, the buffers and pages lists, and
* finally the the drm_device::dma structure itself.
*/
void drm_dma_takedown(drm_device_t * dev)
{
drm_device_dma_t *dma = dev->dma;
int i, j;
if (!dma)
return;
/* Clear dma buffers */
for (i = 0; i <= DRM_MAX_ORDER; i++) {
if (dma->bufs[i].seg_count) {
DRM_DEBUG("order %d: buf_count = %d,"
" seg_count = %d\n",
i,
dma->bufs[i].buf_count,
dma->bufs[i].seg_count);
for (j = 0; j < dma->bufs[i].seg_count; j++) {
if (dma->bufs[i].seglist[j]) {
drm_pci_free(dev, dma->bufs[i].seglist[j]);
}
}
drm_free(dma->bufs[i].seglist,
dma->bufs[i].seg_count
* sizeof(*dma->bufs[0].seglist), DRM_MEM_SEGS);
}
if (dma->bufs[i].buf_count) {
for (j = 0; j < dma->bufs[i].buf_count; j++) {
if (dma->bufs[i].buflist[j].dev_private) {
drm_free(dma->bufs[i].buflist[j].
dev_private,
dma->bufs[i].buflist[j].
dev_priv_size, DRM_MEM_BUFS);
}
}
drm_free(dma->bufs[i].buflist,
dma->bufs[i].buf_count *
sizeof(*dma->bufs[0].buflist), DRM_MEM_BUFS);
}
}
if (dma->buflist) {
drm_free(dma->buflist,
dma->buf_count * sizeof(*dma->buflist), DRM_MEM_BUFS);
}
if (dma->pagelist) {
drm_free(dma->pagelist,
dma->page_count * sizeof(*dma->pagelist),
DRM_MEM_PAGES);
}
drm_free(dev->dma, sizeof(*dev->dma), DRM_MEM_DRIVER);
dev->dma = NULL;
}
/**
* Free a buffer.
*
* \param dev DRM device.
* \param buf buffer to free.
*
* Resets the fields of \p buf.
*/
void drm_free_buffer(drm_device_t * dev, drm_buf_t * buf)
{
if (!buf)
return;
buf->waiting = 0;
buf->pending = 0;
buf->filp = NULL;
buf->used = 0;
if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE)
&& waitqueue_active(&buf->dma_wait)) {
wake_up_interruptible(&buf->dma_wait);
}
}
/**
* Reclaim the buffers.
*
* \param filp file pointer.
*
* Frees each buffer associated with \p filp not already on the hardware.
*/
void drm_core_reclaim_buffers(drm_device_t * dev, struct file *filp)
{
drm_device_dma_t *dma = dev->dma;
int i;
if (!dma)
return;
for (i = 0; i < dma->buf_count; i++) {
if (dma->buflist[i]->filp == filp) {
switch (dma->buflist[i]->list) {
case DRM_LIST_NONE:
drm_free_buffer(dev, dma->buflist[i]);
break;
case DRM_LIST_WAIT:
dma->buflist[i]->list = DRM_LIST_RECLAIM;
break;
default:
/* Buffer already on hardware. */
break;
}
}
}
}
EXPORT_SYMBOL(drm_core_reclaim_buffers);
|
