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 */
drm_legacy_dma_setup(struct drm_device * dev)48 int 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_LEGACY))
54 return 0;
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 */
drm_legacy_dma_takedown(struct drm_device * dev)77 void 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_LEGACY))
84 return;
85
86 if (!dma)
87 return;
88
89 /* Clear dma buffers */
90 for (i = 0; i <= DRM_MAX_ORDER; i++) {
91 if (dma->bufs[i].seg_count) {
92 DRM_DEBUG("order %d: buf_count = %d,"
93 " seg_count = %d\n",
94 i,
95 dma->bufs[i].buf_count,
96 dma->bufs[i].seg_count);
97 for (j = 0; j < dma->bufs[i].seg_count; j++) {
98 if (dma->bufs[i].seglist[j]) {
99 drm_pci_free(dev, dma->bufs[i].seglist[j]);
100 }
101 }
102 kfree(dma->bufs[i].seglist);
103 }
104 if (dma->bufs[i].buf_count) {
105 for (j = 0; j < dma->bufs[i].buf_count; j++) {
106 kfree(dma->bufs[i].buflist[j].dev_private);
107 }
108 kfree(dma->bufs[i].buflist);
109 }
110 }
111
112 kfree(dma->buflist);
113 kfree(dma->pagelist);
114 kfree(dev->dma);
115 dev->dma = NULL;
116 }
117
118 /**
119 * Free a buffer.
120 *
121 * \param dev DRM device.
122 * \param buf buffer to free.
123 *
124 * Resets the fields of \p buf.
125 */
drm_legacy_free_buffer(struct drm_device * dev,struct drm_buf * buf)126 void drm_legacy_free_buffer(struct drm_device *dev, struct drm_buf * buf)
127 {
128 if (!buf)
129 return;
130
131 buf->waiting = 0;
132 buf->pending = 0;
133 buf->file_priv = NULL;
134 buf->used = 0;
135 }
136
137 /**
138 * Reclaim the buffers.
139 *
140 * \param file_priv DRM file private.
141 *
142 * Frees each buffer associated with \p file_priv not already on the hardware.
143 */
drm_legacy_reclaim_buffers(struct drm_device * dev,struct drm_file * file_priv)144 void drm_legacy_reclaim_buffers(struct drm_device *dev,
145 struct drm_file *file_priv)
146 {
147 struct drm_device_dma *dma = dev->dma;
148 int i;
149
150 if (!dma)
151 return;
152 for (i = 0; i < dma->buf_count; i++) {
153 if (dma->buflist[i]->file_priv == file_priv) {
154 switch (dma->buflist[i]->list) {
155 case DRM_LIST_NONE:
156 drm_legacy_free_buffer(dev, dma->buflist[i]);
157 break;
158 case DRM_LIST_WAIT:
159 dma->buflist[i]->list = DRM_LIST_RECLAIM;
160 break;
161 default:
162 /* Buffer already on hardware. */
163 break;
164 }
165 }
166 }
167 }
168