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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 = kzalloc(sizeof(*dev->dma), GFP_KERNEL);
51 if (!dev->dma)
52 return -ENOMEM;
53
54 for (i = 0; i <= DRM_MAX_ORDER; i++)
55 memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0]));
56
57 return 0;
58}
59
60/**
61 * Cleanup the DMA resources.
62 *
63 * \param dev DRM device.
64 *
65 * Free all pages associated with DMA buffers, the buffers and pages lists, and
66 * finally the drm_device::dma structure itself.
67 */
68void drm_dma_takedown(struct drm_device *dev)
69{
70 struct drm_device_dma *dma = dev->dma;
71 int i, j;
72
73 if (!dma)
74 return;
75
76 /* Clear dma buffers */
77 for (i = 0; i <= DRM_MAX_ORDER; i++) {
78 if (dma->bufs[i].seg_count) {
79 DRM_DEBUG("order %d: buf_count = %d,"
80 " seg_count = %d\n",
81 i,
82 dma->bufs[i].buf_count,
83 dma->bufs[i].seg_count);
84 for (j = 0; j < dma->bufs[i].seg_count; j++) {
85 if (dma->bufs[i].seglist[j]) {
86 drm_pci_free(dev, dma->bufs[i].seglist[j]);
87 }
88 }
89 kfree(dma->bufs[i].seglist);
90 }
91 if (dma->bufs[i].buf_count) {
92 for (j = 0; j < dma->bufs[i].buf_count; j++) {
93 kfree(dma->bufs[i].buflist[j].dev_private);
94 }
95 kfree(dma->bufs[i].buflist);
96 }
97 }
98
99 kfree(dma->buflist);
100 kfree(dma->pagelist);
101 kfree(dev->dma);
102 dev->dma = NULL;
103}
104
105/**
106 * Free a buffer.
107 *
108 * \param dev DRM device.
109 * \param buf buffer to free.
110 *
111 * Resets the fields of \p buf.
112 */
113void drm_free_buffer(struct drm_device *dev, struct drm_buf * buf)
114{
115 if (!buf)
116 return;
117
118 buf->waiting = 0;
119 buf->pending = 0;
120 buf->file_priv = NULL;
121 buf->used = 0;
122
123 if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE)
124 && waitqueue_active(&buf->dma_wait)) {
125 wake_up_interruptible(&buf->dma_wait);
126 }
127}
128
129/**
130 * Reclaim the buffers.
131 *
132 * \param file_priv DRM file private.
133 *
134 * Frees each buffer associated with \p file_priv not already on the hardware.
135 */
136void drm_core_reclaim_buffers(struct drm_device *dev,
137 struct drm_file *file_priv)
138{
139 struct drm_device_dma *dma = dev->dma;
140 int i;
141
142 if (!dma)
143 return;
144 for (i = 0; i < dma->buf_count; i++) {
145 if (dma->buflist[i]->file_priv == file_priv) {
146 switch (dma->buflist[i]->list) {
147 case DRM_LIST_NONE:
148 drm_free_buffer(dev, dma->buflist[i]);
149 break;
150 case DRM_LIST_WAIT:
151 dma->buflist[i]->list = DRM_LIST_RECLAIM;
152 break;
153 default:
154 /* Buffer already on hardware. */
155 break;
156 }
157 }
158 }
159}
160
161EXPORT_SYMBOL(drm_core_reclaim_buffers);
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 <linux/export.h>
37#include <drm/drmP.h>
38
39/**
40 * Initialize the DMA data.
41 *
42 * \param dev DRM device.
43 * \return zero on success or a negative value on failure.
44 *
45 * Allocate and initialize a drm_device_dma structure.
46 */
47int drm_legacy_dma_setup(struct drm_device *dev)
48{
49 int i;
50
51 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA) ||
52 drm_core_check_feature(dev, DRIVER_MODESET)) {
53 return 0;
54 }
55
56 dev->buf_use = 0;
57 atomic_set(&dev->buf_alloc, 0);
58
59 dev->dma = kzalloc(sizeof(*dev->dma), GFP_KERNEL);
60 if (!dev->dma)
61 return -ENOMEM;
62
63 for (i = 0; i <= DRM_MAX_ORDER; i++)
64 memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0]));
65
66 return 0;
67}
68
69/**
70 * Cleanup the DMA resources.
71 *
72 * \param dev DRM device.
73 *
74 * Free all pages associated with DMA buffers, the buffers and pages lists, and
75 * finally the drm_device::dma structure itself.
76 */
77void drm_legacy_dma_takedown(struct drm_device *dev)
78{
79 struct drm_device_dma *dma = dev->dma;
80 int i, j;
81
82 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA) ||
83 drm_core_check_feature(dev, DRIVER_MODESET)) {
84 return;
85 }
86
87 if (!dma)
88 return;
89
90 /* Clear dma buffers */
91 for (i = 0; i <= DRM_MAX_ORDER; i++) {
92 if (dma->bufs[i].seg_count) {
93 DRM_DEBUG("order %d: buf_count = %d,"
94 " seg_count = %d\n",
95 i,
96 dma->bufs[i].buf_count,
97 dma->bufs[i].seg_count);
98 for (j = 0; j < dma->bufs[i].seg_count; j++) {
99 if (dma->bufs[i].seglist[j]) {
100 drm_pci_free(dev, dma->bufs[i].seglist[j]);
101 }
102 }
103 kfree(dma->bufs[i].seglist);
104 }
105 if (dma->bufs[i].buf_count) {
106 for (j = 0; j < dma->bufs[i].buf_count; j++) {
107 kfree(dma->bufs[i].buflist[j].dev_private);
108 }
109 kfree(dma->bufs[i].buflist);
110 }
111 }
112
113 kfree(dma->buflist);
114 kfree(dma->pagelist);
115 kfree(dev->dma);
116 dev->dma = NULL;
117}
118
119/**
120 * Free a buffer.
121 *
122 * \param dev DRM device.
123 * \param buf buffer to free.
124 *
125 * Resets the fields of \p buf.
126 */
127void drm_free_buffer(struct drm_device *dev, struct drm_buf * buf)
128{
129 if (!buf)
130 return;
131
132 buf->waiting = 0;
133 buf->pending = 0;
134 buf->file_priv = NULL;
135 buf->used = 0;
136}
137
138/**
139 * Reclaim the buffers.
140 *
141 * \param file_priv DRM file private.
142 *
143 * Frees each buffer associated with \p file_priv not already on the hardware.
144 */
145void drm_core_reclaim_buffers(struct drm_device *dev,
146 struct drm_file *file_priv)
147{
148 struct drm_device_dma *dma = dev->dma;
149 int i;
150
151 if (!dma)
152 return;
153 for (i = 0; i < dma->buf_count; i++) {
154 if (dma->buflist[i]->file_priv == file_priv) {
155 switch (dma->buflist[i]->list) {
156 case DRM_LIST_NONE:
157 drm_free_buffer(dev, dma->buflist[i]);
158 break;
159 case DRM_LIST_WAIT:
160 dma->buflist[i]->list = DRM_LIST_RECLAIM;
161 break;
162 default:
163 /* Buffer already on hardware. */
164 break;
165 }
166 }
167 }
168}
169
170EXPORT_SYMBOL(drm_core_reclaim_buffers);