1 /*
2 * drm_dma.c -- DMA IOCTL and function support -*- linux-c -*-
3 * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com
4 */
5 /*
6 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
7 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
8 * All Rights Reserved.
9 *
10 * Permission is hereby granted, free of charge, to any person obtaining a
11 * copy of this software and associated documentation files (the "Software"),
12 * to deal in the Software without restriction, including without limitation
13 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
14 * and/or sell copies of the Software, and to permit persons to whom the
15 * Software is furnished to do so, subject to the following conditions:
16 *
17 * The above copyright notice and this permission notice (including the next
18 * paragraph) shall be included in all copies or substantial portions of the
19 * Software.
20 *
21 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
22 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
23 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
24 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
25 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
26 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
27 * OTHER DEALINGS IN THE SOFTWARE.
28 *
29 * Authors:
30 * Rickard E. (Rik) Faith <faith@valinux.com>
31 * Gareth Hughes <gareth@valinux.com>
32 *
33 */
34
35 /*
36 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
37 * Use is subject to license terms.
38 */
39
40 #pragma ident "%Z%%M% %I% %E% SMI"
41
42 #include "drmP.h"
43
44 int
drm_dma_setup(drm_device_t * dev)45 drm_dma_setup(drm_device_t *dev)
46 {
47 int i;
48 drm_buf_entry_t *pbuf;
49
50 dev->dma = drm_calloc(1, sizeof (*dev->dma), DRM_MEM_DMA);
51 if (dev->dma == NULL)
52 return (ENOMEM);
53
54 mutex_init(&dev->dma_lock, NULL, MUTEX_DRIVER, NULL);
55 pbuf = &(dev->dma->bufs[0]);
56 for (i = 0; i <= DRM_MAX_ORDER; i++, pbuf++)
57 bzero(pbuf, sizeof (drm_buf_entry_t));
58
59 return (0);
60 }
61
62 void
drm_dma_takedown(drm_device_t * dev)63 drm_dma_takedown(drm_device_t *dev)
64 {
65 drm_device_dma_t *dma = dev->dma;
66 int i, j;
67
68 if (dma == NULL)
69 return;
70
71 /* Clear dma buffers */
72 for (i = 0; i <= DRM_MAX_ORDER; i++) {
73 if (dma->bufs[i].seg_count) {
74 drm_free(dma->bufs[i].seglist,
75 dma->bufs[i].seg_count *
76 sizeof (*dma->bufs[0].seglist), DRM_MEM_SEGS);
77 }
78
79 for (j = 0; j < dma->bufs[i].buf_count; j++) {
80 if (dma->bufs[i].buflist[j].dev_private) {
81 drm_free(dma->bufs[i].buflist[j].dev_private,
82 dma->bufs[i].buflist[j].dev_priv_size,
83 DRM_MEM_BUFS);
84 }
85 }
86 if (dma->bufs[i].buf_count)
87 drm_free(dma->bufs[i].buflist,
88 dma->bufs[i].buf_count *
89 sizeof (*dma->bufs[0].buflist), DRM_MEM_BUFS);
90 }
91 if (dma->buflist) {
92 drm_free(dma->buflist,
93 dma->buf_count *sizeof (*dma->buflist),
94 DRM_MEM_BUFS);
95 }
96
97 if (dma->pagelist) {
98 drm_free(dma->pagelist,
99 dma->page_count *sizeof (*dma->pagelist),
100 DRM_MEM_PAGES);
101 }
102
103 drm_free(dev->dma, sizeof (*dev->dma), DRM_MEM_DRIVER);
104 dev->dma = NULL;
105 mutex_destroy(&dev->dma_lock);
106 }
107
108
109 /*ARGSUSED*/
110 void
drm_free_buffer(drm_device_t * dev,drm_buf_t * buf)111 drm_free_buffer(drm_device_t *dev, drm_buf_t *buf)
112 {
113 if (!buf)
114 return;
115
116 buf->pending = 0;
117 buf->filp = NULL;
118 buf->used = 0;
119 }
120
121 void
drm_reclaim_buffers(drm_device_t * dev,drm_file_t * fpriv)122 drm_reclaim_buffers(drm_device_t *dev, drm_file_t *fpriv)
123 {
124 drm_device_dma_t *dma = dev->dma;
125 int i;
126
127 if (!dma)
128 return;
129 for (i = 0; i < dma->buf_count; i++) {
130 if (dma->buflist[i]->filp == fpriv) {
131 switch (dma->buflist[i]->list) {
132 case DRM_LIST_NONE:
133 drm_free_buffer(dev, dma->buflist[i]);
134 break;
135 case DRM_LIST_WAIT:
136 dma->buflist[i]->list = DRM_LIST_RECLAIM;
137 break;
138 default:
139 /* Buffer already on hardware. */
140 break;
141 }
142 }
143 }
144 }
145
146 /* Call into the driver-specific DMA handler */
147 int
drm_dma(DRM_IOCTL_ARGS)148 drm_dma(DRM_IOCTL_ARGS)
149 {
150 DRM_DEVICE;
151
152 if (dev->driver->dma_ioctl) {
153 return (dev->driver->dma_ioctl(dev, data, fpriv, mode));
154 } else {
155 return (EINVAL);
156 }
157 }
158