io/drm/drm_dma.c

/*
 * 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 2008 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;
    drm_buf_entry_t *pbuf;

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

    mutex_init(&dev->dma_lock, NULL, MUTEX_DRIVER, NULL);
    pbuf = &(dev->dma->bufs[0]);
    for (i = 0; i <= DRM_MAX_ORDER; i++, pbuf++)
        bzero(pbuf, sizeof (drm_buf_entry_t));

    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_free(dma->bufs[i].seglist,
                dma->bufs[i].seg_count *
                sizeof (*dma->bufs[0].seglist), DRM_MEM_SEGS);
        }

        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);
            }
        }
        if (dma->bufs[i].buf_count)
            drm_free(dma->bufs[i].buflist,
                dma->bufs[i].buf_count *
                sizeof (*dma->bufs[0].buflist), DRM_MEM_BUFS);
    }
    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, drm_file_t *fpriv)
{
    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 == fpriv) {
            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->driver->dma_ioctl) {
        return (dev->driver->dma_ioctl(dev, data, fpriv, mode));
    } else {
        return (EINVAL);
    }
}