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 <linux/export.h>
37#include <linux/pci.h>
38
39#include <drm/drm_drv.h>
40#include <drm/drm_print.h>
41
42#include "drm_legacy.h"
43
44/**
45 * drm_legacy_dma_setup() - Initialize the DMA data.
46 *
47 * @dev: DRM device.
48 * Return: zero on success or a negative value on failure.
49 *
50 * Allocate and initialize a drm_device_dma structure.
51 */
52int drm_legacy_dma_setup(struct drm_device *dev)
53{
54 int i;
55
56 if (!drm_core_check_feature(dev, feature: DRIVER_HAVE_DMA) ||
57 !drm_core_check_feature(dev, feature: DRIVER_LEGACY))
58 return 0;
59
60 dev->buf_use = 0;
61 atomic_set(v: &dev->buf_alloc, i: 0);
62
63 dev->dma = kzalloc(size: sizeof(*dev->dma), GFP_KERNEL);
64 if (!dev->dma)
65 return -ENOMEM;
66
67 for (i = 0; i <= DRM_MAX_ORDER; i++)
68 memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0]));
69
70 return 0;
71}
72
73/**
74 * drm_legacy_dma_takedown() - Cleanup the DMA resources.
75 *
76 * @dev: DRM device.
77 *
78 * Free all pages associated with DMA buffers, the buffers and pages lists, and
79 * finally the drm_device::dma structure itself.
80 */
81void drm_legacy_dma_takedown(struct drm_device *dev)
82{
83 struct drm_device_dma *dma = dev->dma;
84 drm_dma_handle_t *dmah;
85 int i, j;
86
87 if (!drm_core_check_feature(dev, feature: DRIVER_HAVE_DMA) ||
88 !drm_core_check_feature(dev, feature: DRIVER_LEGACY))
89 return;
90
91 if (!dma)
92 return;
93
94 /* Clear dma buffers */
95 for (i = 0; i <= DRM_MAX_ORDER; i++) {
96 if (dma->bufs[i].seg_count) {
97 DRM_DEBUG("order %d: buf_count = %d,"
98 " seg_count = %d\n",
99 i,
100 dma->bufs[i].buf_count,
101 dma->bufs[i].seg_count);
102 for (j = 0; j < dma->bufs[i].seg_count; j++) {
103 if (dma->bufs[i].seglist[j]) {
104 dmah = dma->bufs[i].seglist[j];
105 dma_free_coherent(dev: dev->dev,
106 size: dmah->size,
107 cpu_addr: dmah->vaddr,
108 dma_handle: dmah->busaddr);
109 kfree(objp: dmah);
110 }
111 }
112 kfree(objp: dma->bufs[i].seglist);
113 }
114 if (dma->bufs[i].buf_count) {
115 for (j = 0; j < dma->bufs[i].buf_count; j++) {
116 kfree(objp: dma->bufs[i].buflist[j].dev_private);
117 }
118 kfree(objp: dma->bufs[i].buflist);
119 }
120 }
121
122 kfree(objp: dma->buflist);
123 kfree(objp: dma->pagelist);
124 kfree(objp: dev->dma);
125 dev->dma = NULL;
126}
127
128/**
129 * drm_legacy_free_buffer() - Free a buffer.
130 *
131 * @dev: DRM device.
132 * @buf: buffer to free.
133 *
134 * Resets the fields of \p buf.
135 */
136void drm_legacy_free_buffer(struct drm_device *dev, struct drm_buf * buf)
137{
138 if (!buf)
139 return;
140
141 buf->waiting = 0;
142 buf->pending = 0;
143 buf->file_priv = NULL;
144 buf->used = 0;
145}
146
147/**
148 * drm_legacy_reclaim_buffers() - Reclaim the buffers.
149 *
150 * @dev: DRM device.
151 * @file_priv: DRM file private.
152 *
153 * Frees each buffer associated with \p file_priv not already on the hardware.
154 */
155void drm_legacy_reclaim_buffers(struct drm_device *dev,
156 struct drm_file *file_priv)
157{
158 struct drm_device_dma *dma = dev->dma;
159 int i;
160
161 if (!dma)
162 return;
163 for (i = 0; i < dma->buf_count; i++) {
164 if (dma->buflist[i]->file_priv == file_priv) {
165 switch (dma->buflist[i]->list) {
166 case DRM_LIST_NONE:
167 drm_legacy_free_buffer(dev, buf: dma->buflist[i]);
168 break;
169 case DRM_LIST_WAIT:
170 dma->buflist[i]->list = DRM_LIST_RECLAIM;
171 break;
172 default:
173 /* Buffer already on hardware. */
174 break;
175 }
176 }
177 }
178}
179

source code of linux/drivers/gpu/drm/drm_dma.c