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