/*
 * drm_dma.c -- DMA IOCTL and function support -*- linux-c -*-
 * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com
 */
/*
 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors:
 *    Rickard E. (Rik) Faith <faith@valinux.com>
 *    Gareth Hughes <gareth@valinux.com>
 *
 */

/*
 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

#include "drmP.h"

int
drm_dma_setup(drm_device_t *dev)
{
	int i;

	dev->dma = drm_calloc(1, sizeof (*dev->dma), DRM_MEM_DMA);
	if (dev->dma == NULL)
		return (DRM_ERR(ENOMEM));

	mutex_init(&dev->dma_lock, NULL, MUTEX_DRIVER, NULL);

	for (i = 0; i <= DRM_MAX_ORDER; i++)
		(void) memset(&dev->dma->bufs[i], 0,
			    sizeof (dev->dma->bufs[0]));

	return (0);
}

void
drm_dma_takedown(drm_device_t *dev)
{
	drm_device_dma_t  *dma = dev->dma;
	int i, j;

	if (dma == NULL)
		return;

	/* Clear dma buffers */
	for (i = 0; i <= DRM_MAX_ORDER; i++) {
		if (dma->bufs[i].seg_count) {
			DRM_DEBUG("drm_dma_takedown: order %d: buf_count = %d,"
			    " seg_count = %d\n",
			    i,
			    dma->bufs[i].buf_count,
			    dma->bufs[i].seg_count);
			drm_free(dma->bufs[i].seglist,
			    dma->bufs[i].seg_count *
			    sizeof (*dma->bufs[0].seglist), DRM_MEM_SEGS);
		}

		if (dma->bufs[i].buf_count) {
			for (j = 0; j < dma->bufs[i].buf_count; j++) {
				if (dma->bufs[i].buflist[j].dev_private) {
					drm_free(dma->bufs[i].buflist[j].
					    dev_private,
					    dma->bufs[i].buflist[j].
					    dev_priv_size, DRM_MEM_BUFS);
				}
			}
			drm_free(dma->bufs[i].buflist,
			    dma->bufs[i].buf_count *
			    sizeof (*dma->bufs[0].buflist), DRM_MEM_BUFS);
		}
	}
	DRM_DEBUG("drm_dma_takedown: free buflist");
	if (dma->buflist) {
		drm_free(dma->buflist,
		    dma->buf_count *sizeof (*dma->buflist),
		    DRM_MEM_BUFS);
	}

	if (dma->pagelist) {
		drm_free(dma->pagelist,
		    dma->page_count *sizeof (*dma->pagelist),
		    DRM_MEM_PAGES);
	}

	drm_free(dev->dma, sizeof (*dev->dma), DRM_MEM_DRIVER);
	dev->dma = NULL;
	mutex_destroy(&dev->dma_lock);
}


/*ARGSUSED*/
void
drm_free_buffer(drm_device_t *dev, drm_buf_t *buf)
{
	if (!buf)
		return;

	buf->pending	= 0;
	buf->filp	= NULL;
	buf->used	= 0;
}

void
drm_reclaim_buffers(drm_device_t *dev, DRMFILE filp)
{
	drm_device_dma_t *dma = dev->dma;
	int i;

	if (!dma)
		return;
	for (i = 0; i < dma->buf_count; i++) {
		if (dma->buflist[i]->filp == filp) {
			switch (dma->buflist[i]->list) {
			case DRM_LIST_NONE:
				drm_free_buffer(dev, dma->buflist[i]);
				break;
			case DRM_LIST_WAIT:
				dma->buflist[i]->list = DRM_LIST_RECLAIM;
				break;
			default:
				/* Buffer already on hardware. */
				break;
			}
		}
	}
}

/* Call into the driver-specific DMA handler */
int
drm_dma(DRM_IOCTL_ARGS)
{
	DRM_DEVICE;

	if (dev->dma_ioctl) {
		return (dev->dma_ioctl(kdev, dev, data, mode,
					    credp, rvalp, filp));
	} else {
		DRM_DEBUG("drm_dma: DMA ioctl on driver with no dma handler\n");
		return (DRM_ERR(EINVAL));
	}
}