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 <sys/cdefs.h>
37 #include <dev/drm2/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 */
drm_dma_setup(struct drm_device * dev)47 int drm_dma_setup(struct drm_device *dev)
48 {
49 int i;
50
51 dev->dma = malloc(sizeof(*dev->dma), DRM_MEM_DRIVER, M_NOWAIT | M_ZERO);
52 if (!dev->dma)
53 return -ENOMEM;
54
55 for (i = 0; i <= DRM_MAX_ORDER; i++)
56 memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0]));
57
58 return 0;
59 }
60
61 /**
62 * Cleanup the DMA resources.
63 *
64 * \param dev DRM device.
65 *
66 * Free all pages associated with DMA buffers, the buffers and pages lists, and
67 * finally the drm_device::dma structure itself.
68 */
drm_dma_takedown(struct drm_device * dev)69 void drm_dma_takedown(struct drm_device *dev)
70 {
71 struct drm_device_dma *dma = dev->dma;
72 int i, j;
73
74 if (!dma)
75 return;
76
77 /* Clear dma buffers */
78 for (i = 0; i <= DRM_MAX_ORDER; i++) {
79 if (dma->bufs[i].seg_count) {
80 DRM_DEBUG("order %d: buf_count = %d,"
81 " seg_count = %d\n",
82 i,
83 dma->bufs[i].buf_count,
84 dma->bufs[i].seg_count);
85 for (j = 0; j < dma->bufs[i].seg_count; j++) {
86 if (dma->bufs[i].seglist[j]) {
87 drm_pci_free(dev, dma->bufs[i].seglist[j]);
88 }
89 }
90 free(dma->bufs[i].seglist, DRM_MEM_SEGS);
91 }
92 if (dma->bufs[i].buf_count) {
93 for (j = 0; j < dma->bufs[i].buf_count; j++) {
94 free(dma->bufs[i].buflist[j].dev_private,
95 DRM_MEM_BUFS);
96 }
97 free(dma->bufs[i].buflist, DRM_MEM_BUFS);
98 }
99 }
100
101 free(dma->buflist, DRM_MEM_BUFS);
102 free(dma->pagelist, DRM_MEM_PAGES);
103 free(dev->dma, DRM_MEM_DRIVER);
104 dev->dma = NULL;
105 }
106
107 /**
108 * Free a buffer.
109 *
110 * \param dev DRM device.
111 * \param buf buffer to free.
112 *
113 * Resets the fields of \p buf.
114 */
drm_free_buffer(struct drm_device * dev,struct drm_buf * buf)115 void drm_free_buffer(struct drm_device *dev, struct drm_buf * buf)
116 {
117 if (!buf)
118 return;
119
120 buf->waiting = 0;
121 buf->pending = 0;
122 buf->file_priv = NULL;
123 buf->used = 0;
124 }
125
126 /**
127 * Reclaim the buffers.
128 *
129 * \param file_priv DRM file private.
130 *
131 * Frees each buffer associated with \p file_priv not already on the hardware.
132 */
drm_core_reclaim_buffers(struct drm_device * dev,struct drm_file * file_priv)133 void drm_core_reclaim_buffers(struct drm_device *dev,
134 struct drm_file *file_priv)
135 {
136 struct drm_device_dma *dma = dev->dma;
137 int i;
138
139 if (!dma)
140 return;
141 for (i = 0; i < dma->buf_count; i++) {
142 if (dma->buflist[i]->file_priv == file_priv) {
143 switch (dma->buflist[i]->list) {
144 case DRM_LIST_NONE:
145 drm_free_buffer(dev, dma->buflist[i]);
146 break;
147 case DRM_LIST_WAIT:
148 dma->buflist[i]->list = DRM_LIST_RECLAIM;
149 break;
150 default:
151 /* Buffer already on hardware. */
152 break;
153 }
154 }
155 }
156 }
157
158 EXPORT_SYMBOL(drm_core_reclaim_buffers);
159