/**
* \file drm_irq.c
* 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.
*/
static 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);
