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