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-rw-r--r--drivers/gpu/drm/drm_dma.c180
1 files changed, 180 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_dma.c b/drivers/gpu/drm/drm_dma.c
new file mode 100644
index 000000000000..7a8e2fba4678
--- /dev/null
+++ b/drivers/gpu/drm/drm_dma.c
@@ -0,0 +1,180 @@
1/**
2 * \file drm_dma.c
3 * DMA IOCTL and function support
4 *
5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 * \author Gareth Hughes <gareth@valinux.com>
7 */
8
9/*
10 * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com
11 *
12 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
13 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
14 * All Rights Reserved.
15 *
16 * Permission is hereby granted, free of charge, to any person obtaining a
17 * copy of this software and associated documentation files (the "Software"),
18 * to deal in the Software without restriction, including without limitation
19 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
20 * and/or sell copies of the Software, and to permit persons to whom the
21 * Software is furnished to do so, subject to the following conditions:
22 *
23 * The above copyright notice and this permission notice (including the next
24 * paragraph) shall be included in all copies or substantial portions of the
25 * Software.
26 *
27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
28 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
29 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
30 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
31 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
32 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
33 * OTHER DEALINGS IN THE SOFTWARE.
34 */
35
36#include "drmP.h"
37
38/**
39 * Initialize the DMA data.
40 *
41 * \param dev DRM device.
42 * \return zero on success or a negative value on failure.
43 *
44 * Allocate and initialize a drm_device_dma structure.
45 */
46int drm_dma_setup(struct drm_device *dev)
47{
48 int i;
49
50 dev->dma = drm_alloc(sizeof(*dev->dma), DRM_MEM_DRIVER);
51 if (!dev->dma)
52 return -ENOMEM;
53
54 memset(dev->dma, 0, sizeof(*dev->dma));
55
56 for (i = 0; i <= DRM_MAX_ORDER; i++)
57 memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0]));
58
59 return 0;
60}
61
62/**
63 * Cleanup the DMA resources.
64 *
65 * \param dev DRM device.
66 *
67 * Free all pages associated with DMA buffers, the buffers and pages lists, and
68 * finally the drm_device::dma structure itself.
69 */
70void drm_dma_takedown(struct drm_device *dev)
71{
72 struct drm_device_dma *dma = dev->dma;
73 int i, j;
74
75 if (!dma)
76 return;
77
78 /* Clear dma buffers */
79 for (i = 0; i <= DRM_MAX_ORDER; i++) {
80 if (dma->bufs[i].seg_count) {
81 DRM_DEBUG("order %d: buf_count = %d,"
82 " seg_count = %d\n",
83 i,
84 dma->bufs[i].buf_count,
85 dma->bufs[i].seg_count);
86 for (j = 0; j < dma->bufs[i].seg_count; j++) {
87 if (dma->bufs[i].seglist[j]) {
88 drm_pci_free(dev, dma->bufs[i].seglist[j]);
89 }
90 }
91 drm_free(dma->bufs[i].seglist,
92 dma->bufs[i].seg_count
93 * sizeof(*dma->bufs[0].seglist), DRM_MEM_SEGS);
94 }
95 if (dma->bufs[i].buf_count) {
96 for (j = 0; j < dma->bufs[i].buf_count; j++) {
97 if (dma->bufs[i].buflist[j].dev_private) {
98 drm_free(dma->bufs[i].buflist[j].
99 dev_private,
100 dma->bufs[i].buflist[j].
101 dev_priv_size, DRM_MEM_BUFS);
102 }
103 }
104 drm_free(dma->bufs[i].buflist,
105 dma->bufs[i].buf_count *
106 sizeof(*dma->bufs[0].buflist), DRM_MEM_BUFS);
107 }
108 }
109
110 if (dma->buflist) {
111 drm_free(dma->buflist,
112 dma->buf_count * sizeof(*dma->buflist), DRM_MEM_BUFS);
113 }
114
115 if (dma->pagelist) {
116 drm_free(dma->pagelist,
117 dma->page_count * sizeof(*dma->pagelist),
118 DRM_MEM_PAGES);
119 }
120 drm_free(dev->dma, sizeof(*dev->dma), DRM_MEM_DRIVER);
121 dev->dma = NULL;
122}
123
124/**
125 * Free a buffer.
126 *
127 * \param dev DRM device.
128 * \param buf buffer to free.
129 *
130 * Resets the fields of \p buf.
131 */
132void drm_free_buffer(struct drm_device *dev, struct drm_buf * buf)
133{
134 if (!buf)
135 return;
136
137 buf->waiting = 0;
138 buf->pending = 0;
139 buf->file_priv = NULL;
140 buf->used = 0;
141
142 if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE)
143 && waitqueue_active(&buf->dma_wait)) {
144 wake_up_interruptible(&buf->dma_wait);
145 }
146}
147
148/**
149 * Reclaim the buffers.
150 *
151 * \param file_priv DRM file private.
152 *
153 * Frees each buffer associated with \p file_priv not already on the hardware.
154 */
155void drm_core_reclaim_buffers(struct drm_device *dev,
156 struct drm_file *file_priv)
157{
158 struct drm_device_dma *dma = dev->dma;
159 int i;
160
161 if (!dma)
162 return;
163 for (i = 0; i < dma->buf_count; i++) {
164 if (dma->buflist[i]->file_priv == file_priv) {
165 switch (dma->buflist[i]->list) {
166 case DRM_LIST_NONE:
167 drm_free_buffer(dev, dma->buflist[i]);
168 break;
169 case DRM_LIST_WAIT:
170 dma->buflist[i]->list = DRM_LIST_RECLAIM;
171 break;
172 default:
173 /* Buffer already on hardware. */
174 break;
175 }
176 }
177 }
178}
179
180EXPORT_SYMBOL(drm_core_reclaim_buffers);
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