WSL2-Linux-Kernel/drivers/char/drm/drm_dma.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 "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_pci_free(dev, dma->bufs[i].seglist[j]);
				}
			}
			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 (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 (drm_core_check_feature(dev, DRIVER_DMA_QUEUE)
	    && waitqueue_active(&buf->dma_wait)) {
		wake_up_interruptible(&buf->dma_wait);
	}
}

/**
 * Reclaim the buffers.
 *
 * \param filp file pointer.
 *
 * Frees each buffer associated with \p filp not already on the hardware.
 */
void drm_core_reclaim_buffers(drm_device_t * dev, struct file *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;
			}
		}
	}
}

EXPORT_SYMBOL(drm_core_reclaim_buffers);