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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>
David Howells760285e2012-10-02 18:01:07 +010037#include <drm/drmP.h>
Daniel Vetterba8286f2014-09-11 07:43:25 +020038#include "drm_legacy.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
40/**
41 * Initialize the DMA data.
Dave Airlieb5e89ed2005-09-25 14:28:13 +100042 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070043 * \param dev DRM device.
44 * \return zero on success or a negative value on failure.
45 *
46 * Allocate and initialize a drm_device_dma structure.
47 */
Daniel Vettere2e99a82013-08-08 15:41:19 +020048int drm_legacy_dma_setup(struct drm_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070049{
50 int i;
51
Daniel Vettere2e99a82013-08-08 15:41:19 +020052 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA) ||
Daniel Vetterfa538642016-08-03 21:11:10 +020053 !drm_core_check_feature(dev, DRIVER_LEGACY))
Daniel Vettere2e99a82013-08-08 15:41:19 +020054 return 0;
Daniel Vettere2e99a82013-08-08 15:41:19 +020055
56 dev->buf_use = 0;
57 atomic_set(&dev->buf_alloc, 0);
58
Julia Lawall6ebc22e2010-05-13 21:58:56 +020059 dev->dma = kzalloc(sizeof(*dev->dma), GFP_KERNEL);
Dave Airlieb5e89ed2005-09-25 14:28:13 +100060 if (!dev->dma)
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 return -ENOMEM;
62
Dave Airlieb5e89ed2005-09-25 14:28:13 +100063 for (i = 0; i <= DRM_MAX_ORDER; i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0]));
65
66 return 0;
67}
68
69/**
70 * Cleanup the DMA resources.
71 *
72 * \param dev DRM device.
73 *
74 * Free all pages associated with DMA buffers, the buffers and pages lists, and
Michael Opdenacker59c51592007-05-09 08:57:56 +020075 * finally the drm_device::dma structure itself.
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 */
Daniel Vettere2e99a82013-08-08 15:41:19 +020077void drm_legacy_dma_takedown(struct drm_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070078{
Dave Airliecdd55a22007-07-11 16:32:08 +100079 struct drm_device_dma *dma = dev->dma;
Dave Airlieb5e89ed2005-09-25 14:28:13 +100080 int i, j;
Linus Torvalds1da177e2005-04-16 15:20:36 -070081
Daniel Vettere2e99a82013-08-08 15:41:19 +020082 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA) ||
Daniel Vetterfa538642016-08-03 21:11:10 +020083 !drm_core_check_feature(dev, DRIVER_LEGACY))
Daniel Vettere2e99a82013-08-08 15:41:19 +020084 return;
Daniel Vettere2e99a82013-08-08 15:41:19 +020085
Dave Airlieb5e89ed2005-09-25 14:28:13 +100086 if (!dma)
87 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -070088
Dave Airlieb5e89ed2005-09-25 14:28:13 +100089 /* Clear dma buffers */
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 for (i = 0; i <= DRM_MAX_ORDER; i++) {
91 if (dma->bufs[i].seg_count) {
92 DRM_DEBUG("order %d: buf_count = %d,"
93 " seg_count = %d\n",
94 i,
95 dma->bufs[i].buf_count,
96 dma->bufs[i].seg_count);
97 for (j = 0; j < dma->bufs[i].seg_count; j++) {
98 if (dma->bufs[i].seglist[j]) {
Dave Airlieddf19b92006-03-19 18:56:12 +110099 drm_pci_free(dev, dma->bufs[i].seglist[j]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 }
101 }
Eric Anholt9a298b22009-03-24 12:23:04 -0700102 kfree(dma->bufs[i].seglist);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 }
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000104 if (dma->bufs[i].buf_count) {
105 for (j = 0; j < dma->bufs[i].buf_count; j++) {
Eric Anholt9a298b22009-03-24 12:23:04 -0700106 kfree(dma->bufs[i].buflist[j].dev_private);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 }
Eric Anholt9a298b22009-03-24 12:23:04 -0700108 kfree(dma->bufs[i].buflist);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 }
110 }
111
Eric Anholt9a298b22009-03-24 12:23:04 -0700112 kfree(dma->buflist);
113 kfree(dma->pagelist);
114 kfree(dev->dma);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 dev->dma = NULL;
116}
117
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118/**
119 * Free a buffer.
120 *
121 * \param dev DRM device.
122 * \param buf buffer to free.
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000123 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 * Resets the fields of \p buf.
125 */
Daniel Vettera2661622014-09-11 07:41:51 +0200126void drm_legacy_free_buffer(struct drm_device *dev, struct drm_buf * buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127{
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000128 if (!buf)
129 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000131 buf->waiting = 0;
132 buf->pending = 0;
Eric Anholt6c340ea2007-08-25 20:23:09 +1000133 buf->file_priv = NULL;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000134 buf->used = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135}
136
137/**
138 * Reclaim the buffers.
139 *
Eric Anholt6c340ea2007-08-25 20:23:09 +1000140 * \param file_priv DRM file private.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 *
Eric Anholt6c340ea2007-08-25 20:23:09 +1000142 * Frees each buffer associated with \p file_priv not already on the hardware.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 */
Daniel Vettera2661622014-09-11 07:41:51 +0200144void drm_legacy_reclaim_buffers(struct drm_device *dev,
145 struct drm_file *file_priv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146{
Dave Airliecdd55a22007-07-11 16:32:08 +1000147 struct drm_device_dma *dma = dev->dma;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000148 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000150 if (!dma)
151 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 for (i = 0; i < dma->buf_count; i++) {
Eric Anholt6c340ea2007-08-25 20:23:09 +1000153 if (dma->buflist[i]->file_priv == file_priv) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 switch (dma->buflist[i]->list) {
155 case DRM_LIST_NONE:
Daniel Vettera2661622014-09-11 07:41:51 +0200156 drm_legacy_free_buffer(dev, dma->buflist[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 break;
158 case DRM_LIST_WAIT:
159 dma->buflist[i]->list = DRM_LIST_RECLAIM;
160 break;
161 default:
162 /* Buffer already on hardware. */
163 break;
164 }
165 }
166 }
167}