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
38 #include <drm/drm_drv.h>
39 #include <drm/drm_pci.h>
40 #include <drm/drm_print.h>
41
42 #include "drm_legacy.h"
43
44 /**
45 * Initialize the DMA data.
46 *
47 * \param 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 */
52 int 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 * Cleanup the DMA resources.
75 *
76 * \param 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 */
81 void 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 * Free a buffer.
124 *
125 * \param dev DRM device.
126 * \param buf buffer to free.
127 *
128 * Resets the fields of \p buf.
129 */
130 void 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 * Reclaim the buffers.
143 *
144 * \param file_priv DRM file private.
145 *
146 * Frees each buffer associated with \p file_priv not already on the hardware.
147 */
148 void drm_legacy_reclaim_buffers(struct drm_device *dev,
149 struct drm_file *file_priv)
150 {
151 struct drm_device_dma *dma = dev->dma;
152 int i;
153
154 if (!dma)
155 return;
156 for (i = 0; i < dma->buf_count; i++) {
157 if (dma->buflist[i]->file_priv == file_priv) {
158 switch (dma->buflist[i]->list) {
159 case DRM_LIST_NONE:
160 drm_legacy_free_buffer(dev, dma->buflist[i]);
161 break;
162 case DRM_LIST_WAIT:
163 dma->buflist[i]->list = DRM_LIST_RECLAIM;
164 break;
165 default:
166 /* Buffer already on hardware. */
167 break;
168 }
169 }
170 }
171 }