1450N/A/*
1450N/A * Copyright (c) 2006, 2012, Oracle and/or its affiliates. All rights reserved.
1450N/A */
1450N/A
1450N/A/*
1450N/A * Copyright (c) 2012 Intel Corporation. All rights reserved.
1450N/A */
1450N/A
1450N/A/**
1450N/A * \file drm_dma.c
1450N/A * DMA IOCTL and function support
1450N/A *
1450N/A * \author Rickard E. (Rik) Faith <faith@valinux.com>
1450N/A * \author Gareth Hughes <gareth@valinux.com>
1450N/A */
1450N/A
1450N/A/*
1450N/A * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com
1450N/A *
1450N/A * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
1450N/A * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
1450N/A * All Rights Reserved.
1450N/A *
1450N/A * Permission is hereby granted, free of charge, to any person obtaining a
1450N/A * copy of this software and associated documentation files (the "Software"),
1450N/A * to deal in the Software without restriction, including without limitation
1450N/A * the rights to use, copy, modify, merge, publish, distribute, sublicense,
1450N/A * and/or sell copies of the Software, and to permit persons to whom the
1450N/A * Software is furnished to do so, subject to the following conditions:
1450N/A *
1450N/A * The above copyright notice and this permission notice (including the next
1450N/A * paragraph) shall be included in all copies or substantial portions of the
1450N/A * Software.
1450N/A *
1450N/A * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
1450N/A * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
1450N/A * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
1450N/A * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
1450N/A * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
1450N/A * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
1450N/A * OTHER DEALINGS IN THE SOFTWARE.
1450N/A */
1450N/A
1450N/A#include "drmP.h"
1450N/A
1450N/A/**
1450N/A * Initialize the DMA data.
1450N/A *
1450N/A * \param dev DRM device.
1450N/A * \return zero on success or a negative value on failure.
1450N/A *
1450N/A * Allocate and initialize a drm_device_dma structure.
1450N/A */
1450N/Aint drm_dma_setup(struct drm_device *dev)
1450N/A{
1450N/A int i;
1450N/A
1450N/A dev->dma = kmalloc(sizeof(*dev->dma), GFP_KERNEL);
1450N/A if (!dev->dma)
1450N/A return -ENOMEM;
1450N/A
1450N/A (void) memset(dev->dma, 0, sizeof(*dev->dma));
1450N/A
1450N/A for (i = 0; i <= DRM_MAX_ORDER; i++)
1450N/A (void) memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0]));
1450N/A
1450N/A mutex_init(&dev->dma_lock, NULL, MUTEX_DRIVER, NULL);
1450N/A
1450N/A return 0;
1450N/A}
1450N/A
1450N/A/**
1450N/A * Cleanup the DMA resources.
1450N/A *
1450N/A * \param dev DRM device.
1450N/A *
1450N/A * Free all pages associated with DMA buffers, the buffers and pages lists, and
1450N/A * finally the drm_device::dma structure itself.
1450N/A */
1450N/Avoid drm_dma_takedown(struct drm_device *dev)
1450N/A{
1450N/A struct drm_device_dma *dma = dev->dma;
1450N/A int i, j;
1450N/A
1450N/A if (!dma)
1450N/A return;
1450N/A
1450N/A /* Clear dma buffers */
1450N/A for (i = 0; i <= DRM_MAX_ORDER; i++) {
1450N/A if (dma->bufs[i].seg_count) {
1450N/A DRM_DEBUG("order %d: buf_count = %d,"
1450N/A " seg_count = %d\n",
1450N/A i,
1450N/A dma->bufs[i].buf_count,
1450N/A dma->bufs[i].seg_count);
1450N/A kfree(dma->bufs[i].seglist,
1450N/A dma->bufs[i].seg_count * sizeof (*dma->bufs[0].seglist));
1450N/A }
1450N/A if (dma->bufs[i].buf_count) {
1450N/A for (j = 0; j < dma->bufs[i].buf_count; j++) {
1450N/A if (dma->bufs[i].buflist[j].dev_private) {
1450N/A kfree(dma->bufs[i].buflist[j].dev_private,
1450N/A dma->bufs[i].buflist[j].dev_priv_size);
1450N/A }
1450N/A }
1450N/A kfree(dma->bufs[i].buflist,
1450N/A dma->bufs[i].buf_count * sizeof(*dma->bufs[0].buflist));
1450N/A }
1450N/A }
1450N/A
1450N/A if (dma->buflist)
1450N/A kfree(dma->buflist, dma->buf_count * sizeof(*dma->buflist));
1450N/A if (dma->pagelist)
1450N/A kfree(dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
1450N/A kfree(dev->dma, sizeof(*dev->dma));
1450N/A dev->dma = NULL;
1450N/A
1450N/A mutex_destroy(&dev->dma_lock);
1450N/A}
1450N/A
1450N/A/**
1450N/A * Free a buffer.
1450N/A *
1450N/A * \param dev DRM device.
1450N/A * \param buf buffer to free.
1450N/A *
1450N/A * Resets the fields of \p buf.
1450N/A */
1450N/A/* LINTED */
1450N/Avoid drm_free_buffer(struct drm_device *dev, drm_buf_t *buf)
1450N/A{
1450N/A if (!buf)
1450N/A return;
1450N/A
1450N/A buf->pending = 0;
1450N/A buf->file_priv = NULL;
1450N/A buf->used = 0;
1450N/A}
1450N/A
1450N/A/**
1450N/A * Reclaim the buffers.
1450N/A *
1450N/A * \param file_priv DRM file private.
1450N/A *
1450N/A * Frees each buffer associated with \p file_priv not already on the hardware.
1450N/A */
1450N/Avoid drm_core_reclaim_buffers(struct drm_device *dev,
1450N/A struct drm_file *file_priv)
1450N/A{
1450N/A struct drm_device_dma *dma = dev->dma;
1450N/A int i;
1450N/A
1450N/A if (!dma)
1450N/A return;
1450N/A for (i = 0; i < dma->buf_count; i++) {
1450N/A if (dma->buflist[i]->file_priv == file_priv) {
1450N/A switch (dma->buflist[i]->list) {
1450N/A case DRM_LIST_NONE:
1450N/A drm_free_buffer(dev, dma->buflist[i]);
1450N/A break;
1450N/A case DRM_LIST_WAIT:
1450N/A dma->buflist[i]->list = DRM_LIST_RECLAIM;
1450N/A break;
1450N/A default:
1450N/A /* Buffer already on hardware. */
1450N/A break;
1450N/A }
1450N/A }
1450N/A }
1450N/A}
1450N/A