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/**
* \file drm_dma.h
* DMA IOCTL and function support
*
* \author Rickard E. (Rik) Faith <faith@valinux.com>
* \author Gareth Hughes <gareth@valinux.com>
*/
/*
* 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.
*/
#include "drmP.h"
/**
* Initialize the DMA data.
*
* \param dev DRM device.
* \return zero on success or a negative value on failure.
*
* Allocate and initialize a drm_device_dma structure.
*/
int DRM(dma_setup)( drm_device_t *dev )
{
int i;
dev->dma = DRM(alloc)( sizeof(*dev->dma), DRM_MEM_DRIVER );
if ( !dev->dma )
return -ENOMEM;
memset( dev->dma, 0, sizeof(*dev->dma) );
for ( i = 0 ; i <= DRM_MAX_ORDER ; i++ )
memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0]));
return 0;
}
/**
* Cleanup the DMA resources.
*
* \param dev DRM device.
*
* Free all pages associated with DMA buffers, the buffers and pages lists, and
* finally the the drm_device::dma structure itself.
*/
void DRM(dma_takedown)(drm_device_t *dev)
{
drm_device_dma_t *dma = dev->dma;
int i, j;
if (!dma) return;
/* Clear dma buffers */
for (i = 0; i <= DRM_MAX_ORDER; i++) {
if (dma->bufs[i].seg_count) {
DRM_DEBUG("order %d: buf_count = %d,"
" seg_count = %d\n",
i,
dma->bufs[i].buf_count,
dma->bufs[i].seg_count);
for (j = 0; j < dma->bufs[i].seg_count; j++) {
if (dma->bufs[i].seglist[j]) {
DRM(free_pages)(dma->bufs[i].seglist[j],
dma->bufs[i].page_order,
DRM_MEM_DMA);
}
}
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);
if (dev->fn_tbl.freelist_destroy)
dev->fn_tbl.freelist_destroy(&dma->bufs[i].freelist);
}
}
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;
}
/**
* Free a buffer.
*
* \param dev DRM device.
* \param buf buffer to free.
*
* Resets the fields of \p buf.
*/
void DRM(free_buffer)(drm_device_t *dev, drm_buf_t *buf)
{
if (!buf) return;
buf->waiting = 0;
buf->pending = 0;
buf->filp = NULL;
buf->used = 0;
if ( (dev->driver_features & DRIVER_DMA_QUEUE) && waitqueue_active(&buf->dma_wait)) {
wake_up_interruptible(&buf->dma_wait);
}
/* If processes are waiting, the last one
to wake will put the buffer on the free
list. If no processes are waiting, we
put the buffer on the freelist here. */
else if (dev->fn_tbl.freelist_put)
dev->fn_tbl.freelist_put(dev, &dev->dma->bufs[buf->order].freelist, buf);
}
/**
* Reclaim the buffers.
*
* \param filp file pointer.
*
* Frees each buffer associated with \p filp not already on the hardware.
*/
void DRM(core_reclaim_buffers)( struct file *filp )
{
drm_file_t *priv = filp->private_data;
drm_device_t *dev = priv->dev;
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;
}
}
}
}
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