FreeBSD/Linux Kernel Cross Reference
sys/dev/drm/drm_dma.c
1 /*-
2 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
3 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice (including the next
14 * paragraph) shall be included in all copies or substantial portions of the
15 * Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
21 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
22 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
23 * OTHER DEALINGS IN THE SOFTWARE.
24 *
25 * Authors:
26 * Rickard E. (Rik) Faith <faith@valinux.com>
27 * Gareth Hughes <gareth@valinux.com>
28 *
29 */
30
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD: releng/9.0/sys/dev/drm/drm_dma.c 183833 2008-10-13 18:03:27Z rnoland $");
33
34 /** @file drm_dma.c
35 * Support code for DMA buffer management.
36 *
37 * The implementation used to be significantly more complicated, but the
38 * complexity has been moved into the drivers as different buffer management
39 * schemes evolved.
40 */
41
42 #include "dev/drm/drmP.h"
43
44 int drm_dma_setup(struct drm_device *dev)
45 {
46
47 dev->dma = malloc(sizeof(*dev->dma), DRM_MEM_DRIVER, M_NOWAIT | M_ZERO);
48 if (dev->dma == NULL)
49 return ENOMEM;
50
51 DRM_SPININIT(&dev->dma_lock, "drmdma");
52
53 return 0;
54 }
55
56 void drm_dma_takedown(struct drm_device *dev)
57 {
58 drm_device_dma_t *dma = dev->dma;
59 int i, j;
60
61 if (dma == NULL)
62 return;
63
64 /* Clear dma buffers */
65 for (i = 0; i <= DRM_MAX_ORDER; i++) {
66 if (dma->bufs[i].seg_count) {
67 DRM_DEBUG("order %d: buf_count = %d,"
68 " seg_count = %d\n", i, dma->bufs[i].buf_count,
69 dma->bufs[i].seg_count);
70 for (j = 0; j < dma->bufs[i].seg_count; j++) {
71 drm_pci_free(dev, dma->bufs[i].seglist[j]);
72 }
73 free(dma->bufs[i].seglist, DRM_MEM_SEGS);
74 }
75
76 if (dma->bufs[i].buf_count) {
77 for (j = 0; j < dma->bufs[i].buf_count; j++) {
78 free(dma->bufs[i].buflist[j].dev_private,
79 DRM_MEM_BUFS);
80 }
81 free(dma->bufs[i].buflist, DRM_MEM_BUFS);
82 }
83 }
84
85 free(dma->buflist, DRM_MEM_BUFS);
86 free(dma->pagelist, DRM_MEM_PAGES);
87 free(dev->dma, DRM_MEM_DRIVER);
88 dev->dma = NULL;
89 DRM_SPINUNINIT(&dev->dma_lock);
90 }
91
92
93 void drm_free_buffer(struct drm_device *dev, drm_buf_t *buf)
94 {
95 if (!buf)
96 return;
97
98 buf->pending = 0;
99 buf->file_priv= NULL;
100 buf->used = 0;
101 }
102
103 void drm_reclaim_buffers(struct drm_device *dev, struct drm_file *file_priv)
104 {
105 drm_device_dma_t *dma = dev->dma;
106 int i;
107
108 if (!dma)
109 return;
110
111 for (i = 0; i < dma->buf_count; i++) {
112 if (dma->buflist[i]->file_priv == file_priv) {
113 switch (dma->buflist[i]->list) {
114 case DRM_LIST_NONE:
115 drm_free_buffer(dev, dma->buflist[i]);
116 break;
117 case DRM_LIST_WAIT:
118 dma->buflist[i]->list = DRM_LIST_RECLAIM;
119 break;
120 default:
121 /* Buffer already on hardware. */
122 break;
123 }
124 }
125 }
126 }
127
128 /* Call into the driver-specific DMA handler */
129 int drm_dma(struct drm_device *dev, void *data, struct drm_file *file_priv)
130 {
131
132 if (dev->driver->dma_ioctl) {
133 /* shared code returns -errno */
134 return -dev->driver->dma_ioctl(dev, data, file_priv);
135 } else {
136 DRM_DEBUG("DMA ioctl on driver with no dma handler\n");
137 return EINVAL;
138 }
139 }
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