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 "drmP.h"
37
38/**
39 * Initialize the DMA data.
40 *
41 * \param dev DRM device.
42 * \return zero on success or a negative value on failure.
43 *
44 * Allocate and initialize a drm_device_dma structure.
45 */
46int drm_dma_setup(drm_device_t * dev)
47{
48	int i;
49
50	dev->dma = drm_alloc(sizeof(*dev->dma), DRM_MEM_DRIVER);
51	if (!dev->dma)
52		return -ENOMEM;
53
54	memset(dev->dma, 0, sizeof(*dev->dma));
55
56	for (i = 0; i <= DRM_MAX_ORDER; i++)
57		memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0]));
58
59	return 0;
60}
61
62/**
63 * Cleanup the DMA resources.
64 *
65 * \param dev DRM device.
66 *
67 * Free all pages associated with DMA buffers, the buffers and pages lists, and
68 * finally the drm_device::dma structure itself.
69 */
70void drm_dma_takedown(drm_device_t * dev)
71{
72	drm_device_dma_t *dma = dev->dma;
73	int i, j;
74
75	if (!dma)
76		return;
77
78	/* Clear dma buffers */
79	for (i = 0; i <= DRM_MAX_ORDER; i++) {
80		if (dma->bufs[i].seg_count) {
81			DRM_DEBUG("order %d: buf_count = %d,"
82				  " seg_count = %d\n",
83				  i,
84				  dma->bufs[i].buf_count,
85				  dma->bufs[i].seg_count);
86			for (j = 0; j < dma->bufs[i].seg_count; j++) {
87				if (dma->bufs[i].seglist[j]) {
88					drm_pci_free(dev, dma->bufs[i].seglist[j]);
89				}
90			}
91			drm_free(dma->bufs[i].seglist,
92				 dma->bufs[i].seg_count
93				 * sizeof(*dma->bufs[0].seglist), DRM_MEM_SEGS);
94		}
95		if (dma->bufs[i].buf_count) {
96			for (j = 0; j < dma->bufs[i].buf_count; j++) {
97				if (dma->bufs[i].buflist[j].dev_private) {
98					drm_free(dma->bufs[i].buflist[j].
99						 dev_private,
100						 dma->bufs[i].buflist[j].
101						 dev_priv_size, DRM_MEM_BUFS);
102				}
103			}
104			drm_free(dma->bufs[i].buflist,
105				 dma->bufs[i].buf_count *
106				 sizeof(*dma->bufs[0].buflist), DRM_MEM_BUFS);
107		}
108	}
109
110	if (dma->buflist) {
111		drm_free(dma->buflist,
112			 dma->buf_count * sizeof(*dma->buflist), DRM_MEM_BUFS);
113	}
114
115	if (dma->pagelist) {
116		drm_free(dma->pagelist,
117			 dma->page_count * sizeof(*dma->pagelist),
118			 DRM_MEM_PAGES);
119	}
120	drm_free(dev->dma, sizeof(*dev->dma), DRM_MEM_DRIVER);
121	dev->dma = NULL;
122}
123
124/**
125 * Free a buffer.
126 *
127 * \param dev DRM device.
128 * \param buf buffer to free.
129 *
130 * Resets the fields of \p buf.
131 */
132void drm_free_buffer(drm_device_t * dev, drm_buf_t * buf)
133{
134	if (!buf)
135		return;
136
137	buf->waiting = 0;
138	buf->pending = 0;
139	buf->filp = NULL;
140	buf->used = 0;
141
142	if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE)
143	    && waitqueue_active(&buf->dma_wait)) {
144		wake_up_interruptible(&buf->dma_wait);
145	}
146}
147
148/**
149 * Reclaim the buffers.
150 *
151 * \param filp file pointer.
152 *
153 * Frees each buffer associated with \p filp not already on the hardware.
154 */
155void drm_core_reclaim_buffers(drm_device_t * dev, struct file *filp)
156{
157	drm_device_dma_t *dma = dev->dma;
158	int i;
159
160	if (!dma)
161		return;
162	for (i = 0; i < dma->buf_count; i++) {
163		if (dma->buflist[i]->filp == filp) {
164			switch (dma->buflist[i]->list) {
165			case DRM_LIST_NONE:
166				drm_free_buffer(dev, dma->buflist[i]);
167				break;
168			case DRM_LIST_WAIT:
169				dma->buflist[i]->list = DRM_LIST_RECLAIM;
170				break;
171			default:
172				/* Buffer already on hardware. */
173				break;
174			}
175		}
176	}
177}
178
179EXPORT_SYMBOL(drm_core_reclaim_buffers);
180