341 lines
8.3 KiB
C
341 lines
8.3 KiB
C
/**
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* \file drm_irq.h
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* IRQ 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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#define __NO_VERSION__
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#include "drmP.h"
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#include <linux/interrupt.h> /* For task queue support */
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#ifndef __HAVE_SHARED_IRQ
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#define __HAVE_SHARED_IRQ 0
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#endif
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#if __HAVE_SHARED_IRQ
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#define DRM_IRQ_TYPE SA_SHIRQ
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#else
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#define DRM_IRQ_TYPE 0
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#endif
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#if __HAVE_IRQ
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/**
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* Install IRQ handler.
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*
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* \param dev DRM device.
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* \param irq IRQ number.
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*
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* Initializes the IRQ related data, and setups drm_device::vbl_queue. Installs the handler, calling the driver
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* \c DRM(driver_irq_preinstall)() and \c DRM(driver_irq_postinstall)() functions
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* before and after the installation.
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*/
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int DRM(irq_install)( drm_device_t *dev, int irq )
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{
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int ret;
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if ( !irq )
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return -EINVAL;
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down( &dev->struct_sem );
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/* Driver must have been initialized */
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if ( !dev->dev_private ) {
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up( &dev->struct_sem );
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return -EINVAL;
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}
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if ( dev->irq ) {
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up( &dev->struct_sem );
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return -EBUSY;
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}
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dev->irq = irq;
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up( &dev->struct_sem );
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DRM_DEBUG( "%s: irq=%d\n", __FUNCTION__, irq );
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dev->context_flag = 0;
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dev->interrupt_flag = 0;
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dev->dma_flag = 0;
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dev->dma->next_buffer = NULL;
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dev->dma->next_queue = NULL;
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dev->dma->this_buffer = NULL;
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#if __HAVE_IRQ_BH
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#if !HAS_WORKQUEUE
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INIT_LIST_HEAD( &dev->tq.list );
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dev->tq.sync = 0;
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dev->tq.routine = DRM(irq_immediate_bh);
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dev->tq.data = dev;
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#else
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INIT_WORK(&dev->work, DRM(irq_immediate_bh), dev);
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#endif
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#endif
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#if __HAVE_VBL_IRQ
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init_waitqueue_head(&dev->vbl_queue);
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spin_lock_init( &dev->vbl_lock );
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INIT_LIST_HEAD( &dev->vbl_sigs.head );
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dev->vbl_pending = 0;
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#endif
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/* Before installing handler */
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DRM(driver_irq_preinstall)(dev);
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/* Install handler */
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ret = request_irq( dev->irq, DRM(irq_handler),
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DRM_IRQ_TYPE, dev->devname, dev );
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if ( ret < 0 ) {
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down( &dev->struct_sem );
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dev->irq = 0;
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up( &dev->struct_sem );
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return ret;
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}
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/* After installing handler */
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DRM(driver_irq_postinstall)(dev);
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return 0;
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}
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/**
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* Uninstall the IRQ handler.
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*
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* \param dev DRM device.
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*
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* Calls the driver's \c DRM(driver_irq_uninstall)() function, and stops the irq.
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*/
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int DRM(irq_uninstall)( drm_device_t *dev )
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{
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int irq;
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down( &dev->struct_sem );
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irq = dev->irq;
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dev->irq = 0;
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up( &dev->struct_sem );
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if ( !irq )
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return -EINVAL;
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DRM_DEBUG( "%s: irq=%d\n", __FUNCTION__, irq );
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DRM(driver_irq_uninstall)( dev );
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free_irq( irq, dev );
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return 0;
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}
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/**
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* IRQ control ioctl.
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*
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* \param inode device inode.
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* \param filp file pointer.
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* \param cmd command.
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* \param arg user argument, pointing to a drm_control structure.
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* \return zero on success or a negative number on failure.
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*
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* Calls irq_install() or irq_uninstall() according to \p arg.
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*/
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int DRM(control)( struct inode *inode, struct file *filp,
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unsigned int cmd, unsigned long arg )
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{
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drm_file_t *priv = filp->private_data;
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drm_device_t *dev = priv->dev;
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drm_control_t ctl;
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if ( copy_from_user( &ctl, (drm_control_t *)arg, sizeof(ctl) ) )
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return -EFAULT;
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switch ( ctl.func ) {
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case DRM_INST_HANDLER:
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return DRM(irq_install)( dev, ctl.irq );
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case DRM_UNINST_HANDLER:
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return DRM(irq_uninstall)( dev );
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default:
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return -EINVAL;
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}
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}
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#if __HAVE_VBL_IRQ
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/**
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* Wait for VBLANK.
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*
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* \param inode device inode.
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* \param filp file pointer.
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* \param cmd command.
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* \param data user argument, pointing to a drm_wait_vblank structure.
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* \return zero on success or a negative number on failure.
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*
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* Verifies the IRQ is installed.
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*
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* If a signal is requested checks if this task has already scheduled the same signal
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* for the same vblank sequence number - nothing to be done in
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* that case. If the number of tasks waiting for the interrupt exceeds 100 the
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* function fails. Otherwise adds a new entry to drm_device::vbl_sigs for this
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* task.
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*
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* If a signal is not requested, then calls vblank_wait().
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*/
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int DRM(wait_vblank)( DRM_IOCTL_ARGS )
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{
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drm_file_t *priv = filp->private_data;
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drm_device_t *dev = priv->dev;
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drm_wait_vblank_t vblwait;
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struct timeval now;
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int ret = 0;
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unsigned int flags;
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if (!dev->irq)
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return -EINVAL;
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DRM_COPY_FROM_USER_IOCTL( vblwait, (drm_wait_vblank_t *)data,
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sizeof(vblwait) );
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switch ( vblwait.request.type & ~_DRM_VBLANK_FLAGS_MASK ) {
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case _DRM_VBLANK_RELATIVE:
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vblwait.request.sequence += atomic_read( &dev->vbl_received );
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vblwait.request.type &= ~_DRM_VBLANK_RELATIVE;
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case _DRM_VBLANK_ABSOLUTE:
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break;
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default:
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return -EINVAL;
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}
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flags = vblwait.request.type & _DRM_VBLANK_FLAGS_MASK;
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if ( flags & _DRM_VBLANK_SIGNAL ) {
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unsigned long irqflags;
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drm_vbl_sig_t *vbl_sig;
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vblwait.reply.sequence = atomic_read( &dev->vbl_received );
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spin_lock_irqsave( &dev->vbl_lock, irqflags );
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/* Check if this task has already scheduled the same signal
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* for the same vblank sequence number; nothing to be done in
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* that case
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*/
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list_for_each_entry( vbl_sig, &dev->vbl_sigs.head, head ) {
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if (vbl_sig->sequence == vblwait.request.sequence
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&& vbl_sig->info.si_signo == vblwait.request.signal
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&& vbl_sig->task == current)
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{
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spin_unlock_irqrestore( &dev->vbl_lock, irqflags );
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goto done;
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}
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}
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if ( dev->vbl_pending >= 100 ) {
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spin_unlock_irqrestore( &dev->vbl_lock, irqflags );
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return -EBUSY;
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}
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dev->vbl_pending++;
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spin_unlock_irqrestore( &dev->vbl_lock, irqflags );
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if ( !( vbl_sig = DRM_MALLOC( sizeof( drm_vbl_sig_t ) ) ) ) {
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return -ENOMEM;
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}
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memset( (void *)vbl_sig, 0, sizeof(*vbl_sig) );
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vbl_sig->sequence = vblwait.request.sequence;
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vbl_sig->info.si_signo = vblwait.request.signal;
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vbl_sig->task = current;
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spin_lock_irqsave( &dev->vbl_lock, irqflags );
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list_add_tail( (struct list_head *) vbl_sig, &dev->vbl_sigs.head );
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spin_unlock_irqrestore( &dev->vbl_lock, irqflags );
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} else {
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ret = DRM(vblank_wait)( dev, &vblwait.request.sequence );
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do_gettimeofday( &now );
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vblwait.reply.tval_sec = now.tv_sec;
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vblwait.reply.tval_usec = now.tv_usec;
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}
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done:
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DRM_COPY_TO_USER_IOCTL( (drm_wait_vblank_t *)data, vblwait,
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sizeof(vblwait) );
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return ret;
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}
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/**
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* Send the VBLANK signals.
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*
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* \param dev DRM device.
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*
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* Sends a signal for each task in drm_device::vbl_sigs and empties the list.
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*
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* If a signal is not requested, then calls vblank_wait().
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*/
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void DRM(vbl_send_signals)( drm_device_t *dev )
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{
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struct list_head *list, *tmp;
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drm_vbl_sig_t *vbl_sig;
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unsigned int vbl_seq = atomic_read( &dev->vbl_received );
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unsigned long flags;
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spin_lock_irqsave( &dev->vbl_lock, flags );
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list_for_each_safe( list, tmp, &dev->vbl_sigs.head ) {
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vbl_sig = list_entry( list, drm_vbl_sig_t, head );
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if ( ( vbl_seq - vbl_sig->sequence ) <= (1<<23) ) {
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vbl_sig->info.si_code = vbl_seq;
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send_sig_info( vbl_sig->info.si_signo, &vbl_sig->info, vbl_sig->task );
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list_del( list );
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DRM_FREE( vbl_sig, sizeof(*vbl_sig) );
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dev->vbl_pending--;
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}
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}
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spin_unlock_irqrestore( &dev->vbl_lock, flags );
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}
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#endif /* __HAVE_VBL_IRQ */
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#endif /* __HAVE_IRQ */
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