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 <sys/cdefs.h>
37__FBSDID("$FreeBSD$");
38
39#include <dev/drm2/drmP.h>
40
41/**
42 * Initialize the DMA data.
43 *
44 * \param dev DRM device.
45 * \return zero on success or a negative value on failure.
46 *
47 * Allocate and initialize a drm_device_dma structure.
48 */
49int drm_dma_setup(struct drm_device *dev)
50{
51	int i;
52
53	dev->dma = malloc(sizeof(*dev->dma), DRM_MEM_DRIVER, M_NOWAIT | M_ZERO);
54	if (!dev->dma)
55		return -ENOMEM;
56
57	for (i = 0; i <= DRM_MAX_ORDER; i++)
58		memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0]));
59
60	return 0;
61}
62
63/**
64 * Cleanup the DMA resources.
65 *
66 * \param dev DRM device.
67 *
68 * Free all pages associated with DMA buffers, the buffers and pages lists, and
69 * finally the drm_device::dma structure itself.
70 */
71void drm_dma_takedown(struct drm_device *dev)
72{
73	struct drm_device_dma *dma = dev->dma;
74	int i, j;
75
76	if (!dma)
77		return;
78
79	/* Clear dma buffers */
80	for (i = 0; i <= DRM_MAX_ORDER; i++) {
81		if (dma->bufs[i].seg_count) {
82			DRM_DEBUG("order %d: buf_count = %d,"
83				  " seg_count = %d\n",
84				  i,
85				  dma->bufs[i].buf_count,
86				  dma->bufs[i].seg_count);
87			for (j = 0; j < dma->bufs[i].seg_count; j++) {
88				if (dma->bufs[i].seglist[j]) {
89					drm_pci_free(dev, dma->bufs[i].seglist[j]);
90				}
91			}
92			free(dma->bufs[i].seglist, DRM_MEM_SEGS);
93		}
94		if (dma->bufs[i].buf_count) {
95			for (j = 0; j < dma->bufs[i].buf_count; j++) {
96				free(dma->bufs[i].buflist[j].dev_private,
97				    DRM_MEM_BUFS);
98			}
99			free(dma->bufs[i].buflist, DRM_MEM_BUFS);
100		}
101	}
102
103	free(dma->buflist, DRM_MEM_BUFS);
104	free(dma->pagelist, DRM_MEM_PAGES);
105	free(dev->dma, DRM_MEM_DRIVER);
106	dev->dma = NULL;
107}
108
109/**
110 * Free a buffer.
111 *
112 * \param dev DRM device.
113 * \param buf buffer to free.
114 *
115 * Resets the fields of \p buf.
116 */
117void drm_free_buffer(struct drm_device *dev, struct drm_buf * buf)
118{
119	if (!buf)
120		return;
121
122	buf->waiting = 0;
123	buf->pending = 0;
124	buf->file_priv = NULL;
125	buf->used = 0;
126}
127
128/**
129 * Reclaim the buffers.
130 *
131 * \param file_priv DRM file private.
132 *
133 * Frees each buffer associated with \p file_priv not already on the hardware.
134 */
135void drm_core_reclaim_buffers(struct drm_device *dev,
136			      struct drm_file *file_priv)
137{
138	struct drm_device_dma *dma = dev->dma;
139	int i;
140
141	if (!dma)
142		return;
143	for (i = 0; i < dma->buf_count; i++) {
144		if (dma->buflist[i]->file_priv == file_priv) {
145			switch (dma->buflist[i]->list) {
146			case DRM_LIST_NONE:
147				drm_free_buffer(dev, dma->buflist[i]);
148				break;
149			case DRM_LIST_WAIT:
150				dma->buflist[i]->list = DRM_LIST_RECLAIM;
151				break;
152			default:
153				/* Buffer already on hardware. */
154				break;
155			}
156		}
157	}
158}
159
160EXPORT_SYMBOL(drm_core_reclaim_buffers);
161