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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 <linux/pci.h>
38
39#include <drm/drm_drv.h>
40#include <drm/drm_print.h>
41
42#include "drm_legacy.h"
43
44/**
45 * drm_legacy_dma_setup() - Initialize the DMA data.
46 *
47 * @dev: DRM device.
48 * Return: zero on success or a negative value on failure.
49 *
50 * Allocate and initialize a drm_device_dma structure.
51 */
52int drm_legacy_dma_setup(struct drm_device *dev)
53{
54 int i;
55
56 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA) ||
57 !drm_core_check_feature(dev, DRIVER_LEGACY))
58 return 0;
59
60 dev->buf_use = 0;
61 atomic_set(&dev->buf_alloc, 0);
62
63 dev->dma = kzalloc(sizeof(*dev->dma), GFP_KERNEL);
64 if (!dev->dma)
65 return -ENOMEM;
66
67 for (i = 0; i <= DRM_MAX_ORDER; i++)
68 memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0]));
69
70 return 0;
71}
72
73/**
74 * drm_legacy_dma_takedown() - Cleanup the DMA resources.
75 *
76 * @dev: DRM device.
77 *
78 * Free all pages associated with DMA buffers, the buffers and pages lists, and
79 * finally the drm_device::dma structure itself.
80 */
81void drm_legacy_dma_takedown(struct drm_device *dev)
82{
83 struct drm_device_dma *dma = dev->dma;
84 int i, j;
85
86 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA) ||
87 !drm_core_check_feature(dev, DRIVER_LEGACY))
88 return;
89
90 if (!dma)
91 return;
92
93 /* Clear dma buffers */
94 for (i = 0; i <= DRM_MAX_ORDER; i++) {
95 if (dma->bufs[i].seg_count) {
96 DRM_DEBUG("order %d: buf_count = %d,"
97 " seg_count = %d\n",
98 i,
99 dma->bufs[i].buf_count,
100 dma->bufs[i].seg_count);
101 for (j = 0; j < dma->bufs[i].seg_count; j++) {
102 if (dma->bufs[i].seglist[j]) {
103 drm_pci_free(dev, dma->bufs[i].seglist[j]);
104 }
105 }
106 kfree(dma->bufs[i].seglist);
107 }
108 if (dma->bufs[i].buf_count) {
109 for (j = 0; j < dma->bufs[i].buf_count; j++) {
110 kfree(dma->bufs[i].buflist[j].dev_private);
111 }
112 kfree(dma->bufs[i].buflist);
113 }
114 }
115
116 kfree(dma->buflist);
117 kfree(dma->pagelist);
118 kfree(dev->dma);
119 dev->dma = NULL;
120}
121
122/**
123 * drm_legacy_free_buffer() - Free a buffer.
124 *
125 * @dev: DRM device.
126 * @buf: buffer to free.
127 *
128 * Resets the fields of \p buf.
129 */
130void drm_legacy_free_buffer(struct drm_device *dev, struct drm_buf * buf)
131{
132 if (!buf)
133 return;
134
135 buf->waiting = 0;
136 buf->pending = 0;
137 buf->file_priv = NULL;
138 buf->used = 0;
139}
140
141/**
142 * drm_legacy_reclaim_buffers() - Reclaim the buffers.
143 *
144 * @dev: DRM device.
145 * @file_priv: DRM file private.
146 *
147 * Frees each buffer associated with \p file_priv not already on the hardware.
148 */
149void drm_legacy_reclaim_buffers(struct drm_device *dev,
150 struct drm_file *file_priv)
151{
152 struct drm_device_dma *dma = dev->dma;
153 int i;
154
155 if (!dma)
156 return;
157 for (i = 0; i < dma->buf_count; i++) {
158 if (dma->buflist[i]->file_priv == file_priv) {
159 switch (dma->buflist[i]->list) {
160 case DRM_LIST_NONE:
161 drm_legacy_free_buffer(dev, dma->buflist[i]);
162 break;
163 case DRM_LIST_WAIT:
164 dma->buflist[i]->list = DRM_LIST_RECLAIM;
165 break;
166 default:
167 /* Buffer already on hardware. */
168 break;
169 }
170 }
171 }
172}