163 lines
4.0 KiB
C
163 lines
4.0 KiB
C
/**
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* \file drm_dma.c
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* DMA IOCTL and function support
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*
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* \author Rickard E. (Rik) Faith <faith@valinux.com>
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* \author Gareth Hughes <gareth@valinux.com>
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*/
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/*
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* Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com
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*
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* Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
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* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <linux/export.h>
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#include "drmP.h"
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/**
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* Initialize the DMA data.
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*
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* \param dev DRM device.
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* \return zero on success or a negative value on failure.
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*
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* Allocate and initialize a drm_device_dma structure.
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*/
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int drm_dma_setup(struct drm_device *dev)
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{
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int i;
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dev->dma = kzalloc(sizeof(*dev->dma), GFP_KERNEL);
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if (!dev->dma)
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return -ENOMEM;
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for (i = 0; i <= DRM_MAX_ORDER; i++)
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memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0]));
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return 0;
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}
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/**
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* Cleanup the DMA resources.
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*
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* \param dev DRM device.
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*
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* Free all pages associated with DMA buffers, the buffers and pages lists, and
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* finally the drm_device::dma structure itself.
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*/
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void drm_dma_takedown(struct drm_device *dev)
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{
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struct drm_device_dma *dma = dev->dma;
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int i, j;
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if (!dma)
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return;
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/* Clear dma buffers */
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for (i = 0; i <= DRM_MAX_ORDER; i++) {
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if (dma->bufs[i].seg_count) {
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DRM_DEBUG("order %d: buf_count = %d,"
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" seg_count = %d\n",
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i,
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dma->bufs[i].buf_count,
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dma->bufs[i].seg_count);
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for (j = 0; j < dma->bufs[i].seg_count; j++) {
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if (dma->bufs[i].seglist[j]) {
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drm_pci_free(dev, dma->bufs[i].seglist[j]);
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}
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}
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kfree(dma->bufs[i].seglist);
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}
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if (dma->bufs[i].buf_count) {
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for (j = 0; j < dma->bufs[i].buf_count; j++) {
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kfree(dma->bufs[i].buflist[j].dev_private);
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}
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kfree(dma->bufs[i].buflist);
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}
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}
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kfree(dma->buflist);
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kfree(dma->pagelist);
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kfree(dev->dma);
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dev->dma = NULL;
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}
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/**
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* Free a buffer.
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*
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* \param dev DRM device.
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* \param buf buffer to free.
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*
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* Resets the fields of \p buf.
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*/
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void drm_free_buffer(struct drm_device *dev, struct drm_buf * buf)
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{
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if (!buf)
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return;
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buf->waiting = 0;
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buf->pending = 0;
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buf->file_priv = NULL;
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buf->used = 0;
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if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE)
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&& waitqueue_active(&buf->dma_wait)) {
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wake_up_interruptible(&buf->dma_wait);
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}
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}
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/**
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* Reclaim the buffers.
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*
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* \param file_priv DRM file private.
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*
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* Frees each buffer associated with \p file_priv not already on the hardware.
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*/
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void drm_core_reclaim_buffers(struct drm_device *dev,
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struct drm_file *file_priv)
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{
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struct drm_device_dma *dma = dev->dma;
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int i;
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if (!dma)
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return;
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for (i = 0; i < dma->buf_count; i++) {
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if (dma->buflist[i]->file_priv == file_priv) {
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switch (dma->buflist[i]->list) {
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case DRM_LIST_NONE:
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drm_free_buffer(dev, dma->buflist[i]);
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break;
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case DRM_LIST_WAIT:
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dma->buflist[i]->list = DRM_LIST_RECLAIM;
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break;
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default:
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/* Buffer already on hardware. */
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break;
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}
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}
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}
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}
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EXPORT_SYMBOL(drm_core_reclaim_buffers);
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