158 строки
3.9 KiB
C
158 строки
3.9 KiB
C
/**
|
|
* \file drm_dma.c
|
|
* 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 <linux/export.h>
|
|
#include <drm/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(struct drm_device *dev)
|
|
{
|
|
int i;
|
|
|
|
dev->dma = kzalloc(sizeof(*dev->dma), GFP_KERNEL);
|
|
if (!dev->dma)
|
|
return -ENOMEM;
|
|
|
|
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 drm_device::dma structure itself.
|
|
*/
|
|
void drm_dma_takedown(struct drm_device *dev)
|
|
{
|
|
struct drm_device_dma *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_pci_free(dev, dma->bufs[i].seglist[j]);
|
|
}
|
|
}
|
|
kfree(dma->bufs[i].seglist);
|
|
}
|
|
if (dma->bufs[i].buf_count) {
|
|
for (j = 0; j < dma->bufs[i].buf_count; j++) {
|
|
kfree(dma->bufs[i].buflist[j].dev_private);
|
|
}
|
|
kfree(dma->bufs[i].buflist);
|
|
}
|
|
}
|
|
|
|
kfree(dma->buflist);
|
|
kfree(dma->pagelist);
|
|
kfree(dev->dma);
|
|
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(struct drm_device *dev, struct drm_buf * buf)
|
|
{
|
|
if (!buf)
|
|
return;
|
|
|
|
buf->waiting = 0;
|
|
buf->pending = 0;
|
|
buf->file_priv = NULL;
|
|
buf->used = 0;
|
|
}
|
|
|
|
/**
|
|
* Reclaim the buffers.
|
|
*
|
|
* \param file_priv DRM file private.
|
|
*
|
|
* Frees each buffer associated with \p file_priv not already on the hardware.
|
|
*/
|
|
void drm_core_reclaim_buffers(struct drm_device *dev,
|
|
struct drm_file *file_priv)
|
|
{
|
|
struct drm_device_dma *dma = dev->dma;
|
|
int i;
|
|
|
|
if (!dma)
|
|
return;
|
|
for (i = 0; i < dma->buf_count; i++) {
|
|
if (dma->buflist[i]->file_priv == file_priv) {
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
EXPORT_SYMBOL(drm_core_reclaim_buffers);
|