blob: 08f5e5309b22e63d975b2e8357a659ba53e11af0 [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
Paul Gortmaker2d1a8a42011-08-30 18:16:33 -040036#include <linux/export.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include "drmP.h"
38
39/**
40 * Initialize the DMA data.
Dave Airlieb5e89ed2005-09-25 14:28:13 +100041 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070042 * \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 */
Dave Airlie84b1fd12007-07-11 15:53:27 +100047int drm_dma_setup(struct drm_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070048{
49 int i;
50
Julia Lawall6ebc22e2010-05-13 21:58:56 +020051 dev->dma = kzalloc(sizeof(*dev->dma), GFP_KERNEL);
Dave Airlieb5e89ed2005-09-25 14:28:13 +100052 if (!dev->dma)
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 return -ENOMEM;
54
Dave Airlieb5e89ed2005-09-25 14:28:13 +100055 for (i = 0; i <= DRM_MAX_ORDER; i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 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
Michael Opdenacker59c51592007-05-09 08:57:56 +020067 * finally the drm_device::dma structure itself.
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 */
Dave Airlie84b1fd12007-07-11 15:53:27 +100069void drm_dma_takedown(struct drm_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070070{
Dave Airliecdd55a22007-07-11 16:32:08 +100071 struct drm_device_dma *dma = dev->dma;
Dave Airlieb5e89ed2005-09-25 14:28:13 +100072 int i, j;
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
Dave Airlieb5e89ed2005-09-25 14:28:13 +100074 if (!dma)
75 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
Dave Airlieb5e89ed2005-09-25 14:28:13 +100077 /* Clear dma buffers */
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 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]) {
Dave Airlieddf19b92006-03-19 18:56:12 +110087 drm_pci_free(dev, dma->bufs[i].seglist[j]);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 }
89 }
Eric Anholt9a298b22009-03-24 12:23:04 -070090 kfree(dma->bufs[i].seglist);
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 }
Dave Airlieb5e89ed2005-09-25 14:28:13 +100092 if (dma->bufs[i].buf_count) {
93 for (j = 0; j < dma->bufs[i].buf_count; j++) {
Eric Anholt9a298b22009-03-24 12:23:04 -070094 kfree(dma->bufs[i].buflist[j].dev_private);
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 }
Eric Anholt9a298b22009-03-24 12:23:04 -070096 kfree(dma->bufs[i].buflist);
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 }
98 }
99
Eric Anholt9a298b22009-03-24 12:23:04 -0700100 kfree(dma->buflist);
101 kfree(dma->pagelist);
102 kfree(dev->dma);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 dev->dma = NULL;
104}
105
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106/**
107 * Free a buffer.
108 *
109 * \param dev DRM device.
110 * \param buf buffer to free.
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000111 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 * Resets the fields of \p buf.
113 */
Dave Airlie056219e2007-07-11 16:17:42 +1000114void drm_free_buffer(struct drm_device *dev, struct drm_buf * buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115{
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000116 if (!buf)
117 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000119 buf->waiting = 0;
120 buf->pending = 0;
Eric Anholt6c340ea2007-08-25 20:23:09 +1000121 buf->file_priv = NULL;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000122 buf->used = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123}
124
125/**
126 * Reclaim the buffers.
127 *
Eric Anholt6c340ea2007-08-25 20:23:09 +1000128 * \param file_priv DRM file private.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 *
Eric Anholt6c340ea2007-08-25 20:23:09 +1000130 * Frees each buffer associated with \p file_priv not already on the hardware.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 */
Eric Anholt6c340ea2007-08-25 20:23:09 +1000132void drm_core_reclaim_buffers(struct drm_device *dev,
133 struct drm_file *file_priv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134{
Dave Airliecdd55a22007-07-11 16:32:08 +1000135 struct drm_device_dma *dma = dev->dma;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000136 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000138 if (!dma)
139 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 for (i = 0; i < dma->buf_count; i++) {
Eric Anholt6c340ea2007-08-25 20:23:09 +1000141 if (dma->buflist[i]->file_priv == file_priv) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 switch (dma->buflist[i]->list) {
143 case DRM_LIST_NONE:
144 drm_free_buffer(dev, dma->buflist[i]);
145 break;
146 case DRM_LIST_WAIT:
147 dma->buflist[i]->list = DRM_LIST_RECLAIM;
148 break;
149 default:
150 /* Buffer already on hardware. */
151 break;
152 }
153 }
154 }
155}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000157EXPORT_SYMBOL(drm_core_reclaim_buffers);