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