mirror of https://gitee.com/openkylin/linux.git
371 lines
9.7 KiB
C
371 lines
9.7 KiB
C
|
/**
|
||
|
* \file drm_irq.h
|
||
|
* IRQ 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"
|
||
|
|
||
|
#include <linux/interrupt.h> /* For task queue support */
|
||
|
|
||
|
/**
|
||
|
* Get interrupt from bus id.
|
||
|
*
|
||
|
* \param inode device inode.
|
||
|
* \param filp file pointer.
|
||
|
* \param cmd command.
|
||
|
* \param arg user argument, pointing to a drm_irq_busid structure.
|
||
|
* \return zero on success or a negative number on failure.
|
||
|
*
|
||
|
* Finds the PCI device with the specified bus id and gets its IRQ number.
|
||
|
* This IOCTL is deprecated, and will now return EINVAL for any busid not equal
|
||
|
* to that of the device that this DRM instance attached to.
|
||
|
*/
|
||
|
int drm_irq_by_busid(struct inode *inode, struct file *filp,
|
||
|
unsigned int cmd, unsigned long arg)
|
||
|
{
|
||
|
drm_file_t *priv = filp->private_data;
|
||
|
drm_device_t *dev = priv->head->dev;
|
||
|
drm_irq_busid_t __user *argp = (void __user *)arg;
|
||
|
drm_irq_busid_t p;
|
||
|
|
||
|
if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
|
||
|
return -EINVAL;
|
||
|
|
||
|
if (copy_from_user(&p, argp, sizeof(p)))
|
||
|
return -EFAULT;
|
||
|
|
||
|
if ((p.busnum >> 8) != dev->pci_domain ||
|
||
|
(p.busnum & 0xff) != dev->pci_bus ||
|
||
|
p.devnum != dev->pci_slot ||
|
||
|
p.funcnum != dev->pci_func)
|
||
|
return -EINVAL;
|
||
|
|
||
|
p.irq = dev->irq;
|
||
|
|
||
|
DRM_DEBUG("%d:%d:%d => IRQ %d\n",
|
||
|
p.busnum, p.devnum, p.funcnum, p.irq);
|
||
|
if (copy_to_user(argp, &p, sizeof(p)))
|
||
|
return -EFAULT;
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Install IRQ handler.
|
||
|
*
|
||
|
* \param dev DRM device.
|
||
|
* \param irq IRQ number.
|
||
|
*
|
||
|
* Initializes the IRQ related data, and setups drm_device::vbl_queue. Installs the handler, calling the driver
|
||
|
* \c drm_driver_irq_preinstall() and \c drm_driver_irq_postinstall() functions
|
||
|
* before and after the installation.
|
||
|
*/
|
||
|
int drm_irq_install( drm_device_t *dev )
|
||
|
{
|
||
|
int ret;
|
||
|
unsigned long sh_flags=0;
|
||
|
|
||
|
if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
|
||
|
return -EINVAL;
|
||
|
|
||
|
if ( dev->irq == 0 )
|
||
|
return -EINVAL;
|
||
|
|
||
|
down( &dev->struct_sem );
|
||
|
|
||
|
/* Driver must have been initialized */
|
||
|
if ( !dev->dev_private ) {
|
||
|
up( &dev->struct_sem );
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
|
||
|
if ( dev->irq_enabled ) {
|
||
|
up( &dev->struct_sem );
|
||
|
return -EBUSY;
|
||
|
}
|
||
|
dev->irq_enabled = 1;
|
||
|
up( &dev->struct_sem );
|
||
|
|
||
|
DRM_DEBUG( "%s: irq=%d\n", __FUNCTION__, dev->irq );
|
||
|
|
||
|
if (drm_core_check_feature(dev, DRIVER_IRQ_VBL)) {
|
||
|
init_waitqueue_head(&dev->vbl_queue);
|
||
|
|
||
|
spin_lock_init( &dev->vbl_lock );
|
||
|
|
||
|
INIT_LIST_HEAD( &dev->vbl_sigs.head );
|
||
|
|
||
|
dev->vbl_pending = 0;
|
||
|
}
|
||
|
|
||
|
/* Before installing handler */
|
||
|
dev->driver->irq_preinstall(dev);
|
||
|
|
||
|
/* Install handler */
|
||
|
if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED))
|
||
|
sh_flags = SA_SHIRQ;
|
||
|
|
||
|
ret = request_irq( dev->irq, dev->driver->irq_handler,
|
||
|
sh_flags, dev->devname, dev );
|
||
|
if ( ret < 0 ) {
|
||
|
down( &dev->struct_sem );
|
||
|
dev->irq_enabled = 0;
|
||
|
up( &dev->struct_sem );
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
/* After installing handler */
|
||
|
dev->driver->irq_postinstall(dev);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Uninstall the IRQ handler.
|
||
|
*
|
||
|
* \param dev DRM device.
|
||
|
*
|
||
|
* Calls the driver's \c drm_driver_irq_uninstall() function, and stops the irq.
|
||
|
*/
|
||
|
int drm_irq_uninstall( drm_device_t *dev )
|
||
|
{
|
||
|
int irq_enabled;
|
||
|
|
||
|
if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
|
||
|
return -EINVAL;
|
||
|
|
||
|
down( &dev->struct_sem );
|
||
|
irq_enabled = dev->irq_enabled;
|
||
|
dev->irq_enabled = 0;
|
||
|
up( &dev->struct_sem );
|
||
|
|
||
|
if ( !irq_enabled )
|
||
|
return -EINVAL;
|
||
|
|
||
|
DRM_DEBUG( "%s: irq=%d\n", __FUNCTION__, dev->irq );
|
||
|
|
||
|
dev->driver->irq_uninstall(dev);
|
||
|
|
||
|
free_irq( dev->irq, dev );
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
EXPORT_SYMBOL(drm_irq_uninstall);
|
||
|
|
||
|
/**
|
||
|
* IRQ control ioctl.
|
||
|
*
|
||
|
* \param inode device inode.
|
||
|
* \param filp file pointer.
|
||
|
* \param cmd command.
|
||
|
* \param arg user argument, pointing to a drm_control structure.
|
||
|
* \return zero on success or a negative number on failure.
|
||
|
*
|
||
|
* Calls irq_install() or irq_uninstall() according to \p arg.
|
||
|
*/
|
||
|
int drm_control( struct inode *inode, struct file *filp,
|
||
|
unsigned int cmd, unsigned long arg )
|
||
|
{
|
||
|
drm_file_t *priv = filp->private_data;
|
||
|
drm_device_t *dev = priv->head->dev;
|
||
|
drm_control_t ctl;
|
||
|
|
||
|
/* if we haven't irq we fallback for compatibility reasons - this used to be a separate function in drm_dma.h */
|
||
|
|
||
|
if ( copy_from_user( &ctl, (drm_control_t __user *)arg, sizeof(ctl) ) )
|
||
|
return -EFAULT;
|
||
|
|
||
|
switch ( ctl.func ) {
|
||
|
case DRM_INST_HANDLER:
|
||
|
if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
|
||
|
return 0;
|
||
|
if (dev->if_version < DRM_IF_VERSION(1, 2) &&
|
||
|
ctl.irq != dev->irq)
|
||
|
return -EINVAL;
|
||
|
return drm_irq_install( dev );
|
||
|
case DRM_UNINST_HANDLER:
|
||
|
if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
|
||
|
return 0;
|
||
|
return drm_irq_uninstall( dev );
|
||
|
default:
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Wait for VBLANK.
|
||
|
*
|
||
|
* \param inode device inode.
|
||
|
* \param filp file pointer.
|
||
|
* \param cmd command.
|
||
|
* \param data user argument, pointing to a drm_wait_vblank structure.
|
||
|
* \return zero on success or a negative number on failure.
|
||
|
*
|
||
|
* Verifies the IRQ is installed.
|
||
|
*
|
||
|
* If a signal is requested checks if this task has already scheduled the same signal
|
||
|
* for the same vblank sequence number - nothing to be done in
|
||
|
* that case. If the number of tasks waiting for the interrupt exceeds 100 the
|
||
|
* function fails. Otherwise adds a new entry to drm_device::vbl_sigs for this
|
||
|
* task.
|
||
|
*
|
||
|
* If a signal is not requested, then calls vblank_wait().
|
||
|
*/
|
||
|
int drm_wait_vblank( DRM_IOCTL_ARGS )
|
||
|
{
|
||
|
drm_file_t *priv = filp->private_data;
|
||
|
drm_device_t *dev = priv->head->dev;
|
||
|
drm_wait_vblank_t __user *argp = (void __user *)data;
|
||
|
drm_wait_vblank_t vblwait;
|
||
|
struct timeval now;
|
||
|
int ret = 0;
|
||
|
unsigned int flags;
|
||
|
|
||
|
if (!drm_core_check_feature(dev, DRIVER_IRQ_VBL))
|
||
|
return -EINVAL;
|
||
|
|
||
|
if (!dev->irq)
|
||
|
return -EINVAL;
|
||
|
|
||
|
DRM_COPY_FROM_USER_IOCTL( vblwait, argp, sizeof(vblwait) );
|
||
|
|
||
|
switch ( vblwait.request.type & ~_DRM_VBLANK_FLAGS_MASK ) {
|
||
|
case _DRM_VBLANK_RELATIVE:
|
||
|
vblwait.request.sequence += atomic_read( &dev->vbl_received );
|
||
|
vblwait.request.type &= ~_DRM_VBLANK_RELATIVE;
|
||
|
case _DRM_VBLANK_ABSOLUTE:
|
||
|
break;
|
||
|
default:
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
|
||
|
flags = vblwait.request.type & _DRM_VBLANK_FLAGS_MASK;
|
||
|
|
||
|
if ( flags & _DRM_VBLANK_SIGNAL ) {
|
||
|
unsigned long irqflags;
|
||
|
drm_vbl_sig_t *vbl_sig;
|
||
|
|
||
|
vblwait.reply.sequence = atomic_read( &dev->vbl_received );
|
||
|
|
||
|
spin_lock_irqsave( &dev->vbl_lock, irqflags );
|
||
|
|
||
|
/* Check if this task has already scheduled the same signal
|
||
|
* for the same vblank sequence number; nothing to be done in
|
||
|
* that case
|
||
|
*/
|
||
|
list_for_each_entry( vbl_sig, &dev->vbl_sigs.head, head ) {
|
||
|
if (vbl_sig->sequence == vblwait.request.sequence
|
||
|
&& vbl_sig->info.si_signo == vblwait.request.signal
|
||
|
&& vbl_sig->task == current)
|
||
|
{
|
||
|
spin_unlock_irqrestore( &dev->vbl_lock, irqflags );
|
||
|
goto done;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
if ( dev->vbl_pending >= 100 ) {
|
||
|
spin_unlock_irqrestore( &dev->vbl_lock, irqflags );
|
||
|
return -EBUSY;
|
||
|
}
|
||
|
|
||
|
dev->vbl_pending++;
|
||
|
|
||
|
spin_unlock_irqrestore( &dev->vbl_lock, irqflags );
|
||
|
|
||
|
if ( !( vbl_sig = drm_alloc( sizeof( drm_vbl_sig_t ), DRM_MEM_DRIVER ) ) ) {
|
||
|
return -ENOMEM;
|
||
|
}
|
||
|
|
||
|
memset( (void *)vbl_sig, 0, sizeof(*vbl_sig) );
|
||
|
|
||
|
vbl_sig->sequence = vblwait.request.sequence;
|
||
|
vbl_sig->info.si_signo = vblwait.request.signal;
|
||
|
vbl_sig->task = current;
|
||
|
|
||
|
spin_lock_irqsave( &dev->vbl_lock, irqflags );
|
||
|
|
||
|
list_add_tail( (struct list_head *) vbl_sig, &dev->vbl_sigs.head );
|
||
|
|
||
|
spin_unlock_irqrestore( &dev->vbl_lock, irqflags );
|
||
|
} else {
|
||
|
if (dev->driver->vblank_wait)
|
||
|
ret = dev->driver->vblank_wait( dev, &vblwait.request.sequence );
|
||
|
|
||
|
do_gettimeofday( &now );
|
||
|
vblwait.reply.tval_sec = now.tv_sec;
|
||
|
vblwait.reply.tval_usec = now.tv_usec;
|
||
|
}
|
||
|
|
||
|
done:
|
||
|
DRM_COPY_TO_USER_IOCTL( argp, vblwait, sizeof(vblwait) );
|
||
|
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Send the VBLANK signals.
|
||
|
*
|
||
|
* \param dev DRM device.
|
||
|
*
|
||
|
* Sends a signal for each task in drm_device::vbl_sigs and empties the list.
|
||
|
*
|
||
|
* If a signal is not requested, then calls vblank_wait().
|
||
|
*/
|
||
|
void drm_vbl_send_signals( drm_device_t *dev )
|
||
|
{
|
||
|
struct list_head *list, *tmp;
|
||
|
drm_vbl_sig_t *vbl_sig;
|
||
|
unsigned int vbl_seq = atomic_read( &dev->vbl_received );
|
||
|
unsigned long flags;
|
||
|
|
||
|
spin_lock_irqsave( &dev->vbl_lock, flags );
|
||
|
|
||
|
list_for_each_safe( list, tmp, &dev->vbl_sigs.head ) {
|
||
|
vbl_sig = list_entry( list, drm_vbl_sig_t, head );
|
||
|
if ( ( vbl_seq - vbl_sig->sequence ) <= (1<<23) ) {
|
||
|
vbl_sig->info.si_code = vbl_seq;
|
||
|
send_sig_info( vbl_sig->info.si_signo, &vbl_sig->info, vbl_sig->task );
|
||
|
|
||
|
list_del( list );
|
||
|
|
||
|
drm_free( vbl_sig, sizeof(*vbl_sig), DRM_MEM_DRIVER );
|
||
|
|
||
|
dev->vbl_pending--;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
spin_unlock_irqrestore( &dev->vbl_lock, flags );
|
||
|
}
|
||
|
EXPORT_SYMBOL(drm_vbl_send_signals);
|
||
|
|
||
|
|