blob: 2afab95ca036857aed145f03bcf93efc18943a06 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/**
Dave Airlieb5e89ed2005-09-25 14:28:13 +10002 * \file drm_dma.c
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 * 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.
Dave Airlieb5e89ed2005-09-25 14:28:13 +100040 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 * \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 */
Dave Airlieb5e89ed2005-09-25 14:28:13 +100046int drm_dma_setup(drm_device_t * dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070047{
48 int i;
49
Dave Airlieb5e89ed2005-09-25 14:28:13 +100050 dev->dma = drm_alloc(sizeof(*dev->dma), DRM_MEM_DRIVER);
51 if (!dev->dma)
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 return -ENOMEM;
53
Dave Airlieb5e89ed2005-09-25 14:28:13 +100054 memset(dev->dma, 0, sizeof(*dev->dma));
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
Dave Airlieb5e89ed2005-09-25 14:28:13 +100056 for (i = 0; i <= DRM_MAX_ORDER; i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 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 the drm_device::dma structure itself.
69 */
Dave Airlieb5e89ed2005-09-25 14:28:13 +100070void drm_dma_takedown(drm_device_t * dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070071{
Dave Airlieb5e89ed2005-09-25 14:28:13 +100072 drm_device_dma_t *dma = dev->dma;
73 int i, j;
Linus Torvalds1da177e2005-04-16 15:20:36 -070074
Dave Airlieb5e89ed2005-09-25 14:28:13 +100075 if (!dma)
76 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
Dave Airlieb5e89ed2005-09-25 14:28:13 +100078 /* Clear dma buffers */
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 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_free_pages(dma->bufs[i].seglist[j],
Dave Airlieb5e89ed2005-09-25 14:28:13 +100089 dma->bufs[i].page_order,
90 DRM_MEM_DMA);
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 }
92 }
93 drm_free(dma->bufs[i].seglist,
Dave Airlieb5e89ed2005-09-25 14:28:13 +100094 dma->bufs[i].seg_count
95 * sizeof(*dma->bufs[0].seglist), DRM_MEM_SEGS);
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 }
Dave Airlieb5e89ed2005-09-25 14:28:13 +100097 if (dma->bufs[i].buf_count) {
98 for (j = 0; j < dma->bufs[i].buf_count; j++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 if (dma->bufs[i].buflist[j].dev_private) {
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000100 drm_free(dma->bufs[i].buflist[j].
101 dev_private,
102 dma->bufs[i].buflist[j].
103 dev_priv_size, DRM_MEM_BUFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 }
105 }
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000106 drm_free(dma->bufs[i].buflist,
107 dma->bufs[i].buf_count *
108 sizeof(*dma->bufs[0].buflist), DRM_MEM_BUFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 }
110 }
111
112 if (dma->buflist) {
113 drm_free(dma->buflist,
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000114 dma->buf_count * sizeof(*dma->buflist), DRM_MEM_BUFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 }
116
117 if (dma->pagelist) {
118 drm_free(dma->pagelist,
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000119 dma->page_count * sizeof(*dma->pagelist),
120 DRM_MEM_PAGES);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 }
122 drm_free(dev->dma, sizeof(*dev->dma), DRM_MEM_DRIVER);
123 dev->dma = NULL;
124}
125
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126/**
127 * Free a buffer.
128 *
129 * \param dev DRM device.
130 * \param buf buffer to free.
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000131 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 * Resets the fields of \p buf.
133 */
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000134void drm_free_buffer(drm_device_t * dev, drm_buf_t * buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135{
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000136 if (!buf)
137 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000139 buf->waiting = 0;
140 buf->pending = 0;
141 buf->filp = NULL;
142 buf->used = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000144 if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE)
145 && waitqueue_active(&buf->dma_wait)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 wake_up_interruptible(&buf->dma_wait);
147 }
148}
149
150/**
151 * Reclaim the buffers.
152 *
153 * \param filp file pointer.
154 *
155 * Frees each buffer associated with \p filp not already on the hardware.
156 */
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000157void drm_core_reclaim_buffers(drm_device_t * dev, struct file *filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158{
159 drm_device_dma_t *dma = dev->dma;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000160 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000162 if (!dma)
163 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 for (i = 0; i < dma->buf_count; i++) {
165 if (dma->buflist[i]->filp == filp) {
166 switch (dma->buflist[i]->list) {
167 case DRM_LIST_NONE:
168 drm_free_buffer(dev, dma->buflist[i]);
169 break;
170 case DRM_LIST_WAIT:
171 dma->buflist[i]->list = DRM_LIST_RECLAIM;
172 break;
173 default:
174 /* Buffer already on hardware. */
175 break;
176 }
177 }
178 }
179}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000181EXPORT_SYMBOL(drm_core_reclaim_buffers);