1/*
2 * drm_dma.c -- DMA IOCTL and function support -*- linux-c -*-
3 * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com
4 */
5/*
6 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
7 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
8 * All Rights Reserved.
9 *
10 * Permission is hereby granted, free of charge, to any person obtaining a
11 * copy of this software and associated documentation files (the "Software"),
12 * to deal in the Software without restriction, including without limitation
13 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
14 * and/or sell copies of the Software, and to permit persons to whom the
15 * Software is furnished to do so, subject to the following conditions:
16 *
17 * The above copyright notice and this permission notice (including the next
18 * paragraph) shall be included in all copies or substantial portions of the
19 * Software.
20 *
21 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
22 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
23 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
24 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
25 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
26 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
27 * OTHER DEALINGS IN THE SOFTWARE.
28 *
29 * Authors:
30 *    Rickard E. (Rik) Faith <faith@valinux.com>
31 *    Gareth Hughes <gareth@valinux.com>
32 *
33 */
34
35/*
36 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
37 * Use is subject to license terms.
38 */
39
40#pragma ident	"%Z%%M%	%I%	%E% SMI"
41
42#include "drmP.h"
43
44int
45drm_dma_setup(drm_device_t *dev)
46{
47	int i;
48	drm_buf_entry_t *pbuf;
49
50	dev->dma = drm_calloc(1, sizeof (*dev->dma), DRM_MEM_DMA);
51	if (dev->dma == NULL)
52		return (ENOMEM);
53
54	mutex_init(&dev->dma_lock, NULL, MUTEX_DRIVER, NULL);
55	pbuf = &(dev->dma->bufs[0]);
56	for (i = 0; i <= DRM_MAX_ORDER; i++, pbuf++)
57		bzero(pbuf, sizeof (drm_buf_entry_t));
58
59	return (0);
60}
61
62void
63drm_dma_takedown(drm_device_t *dev)
64{
65	drm_device_dma_t  *dma = dev->dma;
66	int i, j;
67
68	if (dma == NULL)
69		return;
70
71	/* Clear dma buffers */
72	for (i = 0; i <= DRM_MAX_ORDER; i++) {
73		if (dma->bufs[i].seg_count) {
74			drm_free(dma->bufs[i].seglist,
75			    dma->bufs[i].seg_count *
76			    sizeof (*dma->bufs[0].seglist), DRM_MEM_SEGS);
77		}
78
79		for (j = 0; j < dma->bufs[i].buf_count; j++) {
80			if (dma->bufs[i].buflist[j].dev_private) {
81				drm_free(dma->bufs[i].buflist[j].dev_private,
82				    dma->bufs[i].buflist[j].dev_priv_size,
83				    DRM_MEM_BUFS);
84			}
85		}
86		if (dma->bufs[i].buf_count)
87			drm_free(dma->bufs[i].buflist,
88			    dma->bufs[i].buf_count *
89			    sizeof (*dma->bufs[0].buflist), DRM_MEM_BUFS);
90	}
91	if (dma->buflist) {
92		drm_free(dma->buflist,
93		    dma->buf_count *sizeof (*dma->buflist),
94		    DRM_MEM_BUFS);
95	}
96
97	if (dma->pagelist) {
98		drm_free(dma->pagelist,
99		    dma->page_count *sizeof (*dma->pagelist),
100		    DRM_MEM_PAGES);
101	}
102
103	drm_free(dev->dma, sizeof (*dev->dma), DRM_MEM_DRIVER);
104	dev->dma = NULL;
105	mutex_destroy(&dev->dma_lock);
106}
107
108
109/*ARGSUSED*/
110void
111drm_free_buffer(drm_device_t *dev, drm_buf_t *buf)
112{
113	if (!buf)
114		return;
115
116	buf->pending	= 0;
117	buf->filp	= NULL;
118	buf->used	= 0;
119}
120
121void
122drm_reclaim_buffers(drm_device_t *dev, drm_file_t *fpriv)
123{
124	drm_device_dma_t *dma = dev->dma;
125	int i;
126
127	if (!dma)
128		return;
129	for (i = 0; i < dma->buf_count; i++) {
130		if (dma->buflist[i]->filp == fpriv) {
131			switch (dma->buflist[i]->list) {
132			case DRM_LIST_NONE:
133				drm_free_buffer(dev, dma->buflist[i]);
134				break;
135			case DRM_LIST_WAIT:
136				dma->buflist[i]->list = DRM_LIST_RECLAIM;
137				break;
138			default:
139				/* Buffer already on hardware. */
140				break;
141			}
142		}
143	}
144}
145
146/* Call into the driver-specific DMA handler */
147int
148drm_dma(DRM_IOCTL_ARGS)
149{
150	DRM_DEVICE;
151
152	if (dev->driver->dma_ioctl) {
153		return (dev->driver->dma_ioctl(dev, data, fpriv, mode));
154	} else {
155		return (EINVAL);
156	}
157}
158