Root/drivers/gpu/drm/drm_dma.c

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 "drmP.h"
38
39/**
40 * Initialize the DMA data.
41 *
42 * \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 */
47int drm_dma_setup(struct drm_device *dev)
48{
49    int i;
50
51    dev->dma = kzalloc(sizeof(*dev->dma), GFP_KERNEL);
52    if (!dev->dma)
53        return -ENOMEM;
54
55    for (i = 0; i <= DRM_MAX_ORDER; i++)
56        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
67 * finally the drm_device::dma structure itself.
68 */
69void drm_dma_takedown(struct drm_device *dev)
70{
71    struct drm_device_dma *dma = dev->dma;
72    int i, j;
73
74    if (!dma)
75        return;
76
77    /* Clear dma buffers */
78    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]) {
87                    drm_pci_free(dev, dma->bufs[i].seglist[j]);
88                }
89            }
90            kfree(dma->bufs[i].seglist);
91        }
92        if (dma->bufs[i].buf_count) {
93            for (j = 0; j < dma->bufs[i].buf_count; j++) {
94                kfree(dma->bufs[i].buflist[j].dev_private);
95            }
96            kfree(dma->bufs[i].buflist);
97        }
98    }
99
100    kfree(dma->buflist);
101    kfree(dma->pagelist);
102    kfree(dev->dma);
103    dev->dma = NULL;
104}
105
106/**
107 * Free a buffer.
108 *
109 * \param dev DRM device.
110 * \param buf buffer to free.
111 *
112 * Resets the fields of \p buf.
113 */
114void drm_free_buffer(struct drm_device *dev, struct drm_buf * buf)
115{
116    if (!buf)
117        return;
118
119    buf->waiting = 0;
120    buf->pending = 0;
121    buf->file_priv = NULL;
122    buf->used = 0;
123}
124
125/**
126 * Reclaim the buffers.
127 *
128 * \param file_priv DRM file private.
129 *
130 * Frees each buffer associated with \p file_priv not already on the hardware.
131 */
132void drm_core_reclaim_buffers(struct drm_device *dev,
133                  struct drm_file *file_priv)
134{
135    struct drm_device_dma *dma = dev->dma;
136    int i;
137
138    if (!dma)
139        return;
140    for (i = 0; i < dma->buf_count; i++) {
141        if (dma->buflist[i]->file_priv == file_priv) {
142            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}
156
157EXPORT_SYMBOL(drm_core_reclaim_buffers);
158

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