[deliverable/linux.git] / drivers / char / drm / drm_irq.c

/**
 * \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)
{
	struct drm_file *priv = filp->private_data;
	struct drm_device *dev = priv->head->dev;
	struct drm_irq_busid __user *argp = (void __user *)arg;
	struct drm_irq_busid 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) != drm_get_pci_domain(dev) ||
	    (p.busnum & 0xff) != dev->pdev->bus->number ||
	    p.devnum != PCI_SLOT(dev->pdev->devfn) || p.funcnum != PCI_FUNC(dev->pdev->devfn))
		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(struct drm_device * 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;

	mutex_lock(&dev->struct_mutex);

	/* Driver must have been initialized */
	if (!dev->dev_private) {
		mutex_unlock(&dev->struct_mutex);
		return -EINVAL;
	}

	if (dev->irq_enabled) {
		mutex_unlock(&dev->struct_mutex);
		return -EBUSY;
	}
	dev->irq_enabled = 1;
	mutex_unlock(&dev->struct_mutex);

	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);
		INIT_LIST_HEAD(&dev->vbl_sigs2);

		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 = IRQF_SHARED;

	ret = request_irq(dev->irq, dev->driver->irq_handler,
			  sh_flags, dev->devname, dev);
	if (ret < 0) {
		mutex_lock(&dev->struct_mutex);
		dev->irq_enabled = 0;
		mutex_unlock(&dev->struct_mutex);
		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(struct drm_device * dev)
{
	int irq_enabled;

	if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
		return -EINVAL;

	mutex_lock(&dev->struct_mutex);
	irq_enabled = dev->irq_enabled;
	dev->irq_enabled = 0;
	mutex_unlock(&dev->struct_mutex);

	if (!irq_enabled)
		return -EINVAL;

	DRM_DEBUG("%s: irq=%d\n", __FUNCTION__, dev->irq);

	dev->driver->irq_uninstall(dev);

	free_irq(dev->irq, dev);

	dev->locked_tasklet_func = NULL;

	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)
{
	struct drm_file *priv = filp->private_data;
	struct drm_device *dev = priv->head->dev;
	struct drm_control 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, (struct drm_control __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)
{
	struct drm_file *priv = filp->private_data;
	struct drm_device *dev = priv->head->dev;
	union drm_wait_vblank __user *argp = (void __user *)data;
	union drm_wait_vblank vblwait;
	struct timeval now;
	int ret = 0;
	unsigned int flags, seq;

	if (!dev->irq)
		return -EINVAL;

	if (copy_from_user(&vblwait, argp, sizeof(vblwait)))
		return -EFAULT;

	if (vblwait.request.type &
	    ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK)) {
		DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n",
			  vblwait.request.type,
			  (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK));
		return -EINVAL;
	}

	flags = vblwait.request.type & _DRM_VBLANK_FLAGS_MASK;

	if (!drm_core_check_feature(dev, (flags & _DRM_VBLANK_SECONDARY) ?
				    DRIVER_IRQ_VBL2 : DRIVER_IRQ_VBL))
		return -EINVAL;

	seq = atomic_read((flags & _DRM_VBLANK_SECONDARY) ? &dev->vbl_received2
			  : &dev->vbl_received);

	switch (vblwait.request.type & _DRM_VBLANK_TYPES_MASK) {
	case _DRM_VBLANK_RELATIVE:
		vblwait.request.sequence += seq;
		vblwait.request.type &= ~_DRM_VBLANK_RELATIVE;
	case _DRM_VBLANK_ABSOLUTE:
		break;
	default:
		return -EINVAL;
	}

	if ((flags & _DRM_VBLANK_NEXTONMISS) &&
	    (seq - vblwait.request.sequence) <= (1<<23)) {
		vblwait.request.sequence = seq + 1;
	}

	if (flags & _DRM_VBLANK_SIGNAL) {
		unsigned long irqflags;
		struct list_head *vbl_sigs = (flags & _DRM_VBLANK_SECONDARY)
				      ? &dev->vbl_sigs2 : &dev->vbl_sigs;
		drm_vbl_sig_t *vbl_sig;

		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, vbl_sigs, 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);
				vblwait.reply.sequence = seq;
				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(&vbl_sig->head, vbl_sigs);

		spin_unlock_irqrestore(&dev->vbl_lock, irqflags);

		vblwait.reply.sequence = seq;
	} else {
		if (flags & _DRM_VBLANK_SECONDARY) {
			if (dev->driver->vblank_wait2)
				ret = dev->driver->vblank_wait2(dev, &vblwait.request.sequence);
		} 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:
	if (copy_to_user(argp, &vblwait, sizeof(vblwait)))
		return -EFAULT;

	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(struct drm_device * dev)
{
	unsigned long flags;
	int i;

	spin_lock_irqsave(&dev->vbl_lock, flags);

	for (i = 0; i < 2; i++) {
		drm_vbl_sig_t *vbl_sig, *tmp;
		struct list_head *vbl_sigs = i ? &dev->vbl_sigs2 : &dev->vbl_sigs;
		unsigned int vbl_seq = atomic_read(i ? &dev->vbl_received2 :
						   &dev->vbl_received);

		list_for_each_entry_safe(vbl_sig, tmp, vbl_sigs, 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(&vbl_sig->head);

				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);

/**
 * Tasklet wrapper function.
 *
 * \param data DRM device in disguise.
 *
 * Attempts to grab the HW lock and calls the driver callback on success. On
 * failure, leave the lock marked as contended so the callback can be called
 * from drm_unlock().
 */
static void drm_locked_tasklet_func(unsigned long data)
{
	struct drm_device *dev = (struct drm_device *)data;
	unsigned long irqflags;

	spin_lock_irqsave(&dev->tasklet_lock, irqflags);

	if (!dev->locked_tasklet_func ||
	    !drm_lock_take(&dev->lock,
			   DRM_KERNEL_CONTEXT)) {
		spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);
		return;
	}

	dev->lock.lock_time = jiffies;
	atomic_inc(&dev->counts[_DRM_STAT_LOCKS]);

	dev->locked_tasklet_func(dev);

	drm_lock_free(&dev->lock,
		      DRM_KERNEL_CONTEXT);

	dev->locked_tasklet_func = NULL;

	spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);
}

/**
 * Schedule a tasklet to call back a driver hook with the HW lock held.
 *
 * \param dev DRM device.
 * \param func Driver callback.
 *
 * This is intended for triggering actions that require the HW lock from an
 * interrupt handler. The lock will be grabbed ASAP after the interrupt handler
 * completes. Note that the callback may be called from interrupt or process
 * context, it must not make any assumptions about this. Also, the HW lock will
 * be held with the kernel context or any client context.
 */
void drm_locked_tasklet(struct drm_device *dev, void (*func)(struct drm_device *))
{
	unsigned long irqflags;
	static DECLARE_TASKLET(drm_tasklet, drm_locked_tasklet_func, 0);

	if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ) ||
	    test_bit(TASKLET_STATE_SCHED, &drm_tasklet.state))
		return;

	spin_lock_irqsave(&dev->tasklet_lock, irqflags);

	if (dev->locked_tasklet_func) {
		spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);
		return;
	}

	dev->locked_tasklet_func = func;

	spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);

	drm_tasklet.data = (unsigned long)dev;

	tasklet_hi_schedule(&drm_tasklet);
}
EXPORT_SYMBOL(drm_locked_tasklet);
Commit	Line	Data
1da177e4	1	/**
b5e89ed5	2	* \file drm_irq.c
1da177e4 LT	3	* IRQ support
	4	*
	5	* \author Rickard E. (Rik) Faith <faith@valinux.com>
	6	* \author Gareth Hughes <gareth@valinux.com>
	7	*/
	8
	9	/*
	10	* Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com
	11	*
	12	* Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
	13	* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
	14	* All Rights Reserved.
	15	*
	16	* Permission is hereby granted, free of charge, to any person obtaining a
	17	* copy of this software and associated documentation files (the "Software"),
	18	* to deal in the Software without restriction, including without limitation
	19	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	20	* and/or sell copies of the Software, and to permit persons to whom the
	21	* Software is furnished to do so, subject to the following conditions:
	22	*
	23	* The above copyright notice and this permission notice (including the next
	24	* paragraph) shall be included in all copies or substantial portions of the
	25	* Software.
	26	*
	27	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	28	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	29	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	30	* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
	31	* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
	32	* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
	33	* OTHER DEALINGS IN THE SOFTWARE.
	34	*/
	35
	36	#include "drmP.h"
	37
	38	#include <linux/interrupt.h> /* For task queue support */
	39
	40	/**
	41	* Get interrupt from bus id.
b5e89ed5	42	*
1da177e4 LT	43	* \param inode device inode.
	44	* \param filp file pointer.
	45	* \param cmd command.
	46	* \param arg user argument, pointing to a drm_irq_busid structure.
	47	* \return zero on success or a negative number on failure.
b5e89ed5	48	*
1da177e4 LT	49	* Finds the PCI device with the specified bus id and gets its IRQ number.
	50	* This IOCTL is deprecated, and will now return EINVAL for any busid not equal
	51	* to that of the device that this DRM instance attached to.
	52	*/
	53	int drm_irq_by_busid(struct inode inode, struct file filp,
b5e89ed5	54	unsigned int cmd, unsigned long arg)
1da177e4	55	{
84b1fd10 DA	56	struct drm_file *priv = filp->private_data;
84b1fd10 DA	57	struct drm_device *dev = priv->head->dev;
c60ce623 DA	58	struct drm_irq_busid __user argp = (void __user )arg;
c60ce623 DA	59	struct drm_irq_busid p;
1da177e4 LT	60
	61	if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
	62	return -EINVAL;
	63
	64	if (copy_from_user(&p, argp, sizeof(p)))
	65	return -EFAULT;
	66
33229601	67	if ((p.busnum >> 8) != drm_get_pci_domain(dev) \|\|
242ef0e1 D	68	(p.busnum & 0xff) != dev->pdev->bus->number \|\|
242ef0e1 D	69	p.devnum != PCI_SLOT(dev->pdev->devfn) \|\| p.funcnum != PCI_FUNC(dev->pdev->devfn))
1da177e4 LT	70	return -EINVAL;
	71
	72	p.irq = dev->irq;
	73
b5e89ed5	74	DRM_DEBUG("%d:%d:%d => IRQ %d\n", p.busnum, p.devnum, p.funcnum, p.irq);
1da177e4 LT	75	if (copy_to_user(argp, &p, sizeof(p)))
	76	return -EFAULT;
	77	return 0;
	78	}
	79
	80	/**
	81	* Install IRQ handler.
	82	*
	83	* \param dev DRM device.
	84	* \param irq IRQ number.
	85	*
	86	* Initializes the IRQ related data, and setups drm_device::vbl_queue. Installs the handler, calling the driver
	87	* \c drm_driver_irq_preinstall() and \c drm_driver_irq_postinstall() functions
	88	* before and after the installation.
	89	*/
84b1fd10	90	static int drm_irq_install(struct drm_device * dev)
1da177e4 LT	91	{
1da177e4 LT	92	int ret;
b5e89ed5	93	unsigned long sh_flags = 0;
1da177e4 LT	94
	95	if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
	96	return -EINVAL;
	97
b5e89ed5	98	if (dev->irq == 0)
1da177e4 LT	99	return -EINVAL;
1da177e4 LT	100
30e2fb18	101	mutex_lock(&dev->struct_mutex);
1da177e4 LT	102
1da177e4 LT	103	/* Driver must have been initialized */
b5e89ed5	104	if (!dev->dev_private) {
30e2fb18	105	mutex_unlock(&dev->struct_mutex);
1da177e4 LT	106	return -EINVAL;
	107	}
	108
b5e89ed5	109	if (dev->irq_enabled) {
30e2fb18	110	mutex_unlock(&dev->struct_mutex);
1da177e4 LT	111	return -EBUSY;
	112	}
	113	dev->irq_enabled = 1;
30e2fb18	114	mutex_unlock(&dev->struct_mutex);
1da177e4	115
b5e89ed5	116	DRM_DEBUG("%s: irq=%d\n", __FUNCTION__, dev->irq);
1da177e4 LT	117
	118	if (drm_core_check_feature(dev, DRIVER_IRQ_VBL)) {
	119	init_waitqueue_head(&dev->vbl_queue);
b5e89ed5 DA	120
	121	spin_lock_init(&dev->vbl_lock);
	122
bd1b331f DA	123	INIT_LIST_HEAD(&dev->vbl_sigs);
bd1b331f DA	124	INIT_LIST_HEAD(&dev->vbl_sigs2);
b5e89ed5	125
1da177e4 LT	126	dev->vbl_pending = 0;
	127	}
	128
b5e89ed5	129	/* Before installing handler */
1da177e4 LT	130	dev->driver->irq_preinstall(dev);
1da177e4 LT	131
b5e89ed5	132	/* Install handler */
1da177e4	133	if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED))
935f6e3a	134	sh_flags = IRQF_SHARED;
b5e89ed5 DA	135
	136	ret = request_irq(dev->irq, dev->driver->irq_handler,
	137	sh_flags, dev->devname, dev);
	138	if (ret < 0) {
30e2fb18	139	mutex_lock(&dev->struct_mutex);
1da177e4	140	dev->irq_enabled = 0;
30e2fb18	141	mutex_unlock(&dev->struct_mutex);
1da177e4 LT	142	return ret;
	143	}
	144
b5e89ed5	145	/* After installing handler */
1da177e4 LT	146	dev->driver->irq_postinstall(dev);
	147
	148	return 0;
	149	}
	150
	151	/**
	152	* Uninstall the IRQ handler.
	153	*
	154	* \param dev DRM device.
	155	*
	156	* Calls the driver's \c drm_driver_irq_uninstall() function, and stops the irq.
	157	*/
84b1fd10	158	int drm_irq_uninstall(struct drm_device * dev)
1da177e4 LT	159	{
	160	int irq_enabled;
	161
	162	if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
	163	return -EINVAL;
	164
30e2fb18	165	mutex_lock(&dev->struct_mutex);
1da177e4 LT	166	irq_enabled = dev->irq_enabled;
1da177e4 LT	167	dev->irq_enabled = 0;
30e2fb18	168	mutex_unlock(&dev->struct_mutex);
1da177e4	169
b5e89ed5	170	if (!irq_enabled)
1da177e4 LT	171	return -EINVAL;
1da177e4 LT	172
b5e89ed5	173	DRM_DEBUG("%s: irq=%d\n", __FUNCTION__, dev->irq);
1da177e4 LT	174
	175	dev->driver->irq_uninstall(dev);
	176
b5e89ed5	177	free_irq(dev->irq, dev);
1da177e4	178
2e54a007 MCA	179	dev->locked_tasklet_func = NULL;
2e54a007 MCA	180
1da177e4 LT	181	return 0;
1da177e4 LT	182	}
b5e89ed5	183
1da177e4 LT	184	EXPORT_SYMBOL(drm_irq_uninstall);
	185
	186	/**
	187	* IRQ control ioctl.
	188	*
	189	* \param inode device inode.
	190	* \param filp file pointer.
	191	* \param cmd command.
	192	* \param arg user argument, pointing to a drm_control structure.
	193	* \return zero on success or a negative number on failure.
	194	*
	195	* Calls irq_install() or irq_uninstall() according to \p arg.
	196	*/
b5e89ed5 DA	197	int drm_control(struct inode inode, struct file filp,
b5e89ed5 DA	198	unsigned int cmd, unsigned long arg)
1da177e4	199	{
84b1fd10 DA	200	struct drm_file *priv = filp->private_data;
84b1fd10 DA	201	struct drm_device *dev = priv->head->dev;
c60ce623	202	struct drm_control ctl;
b5e89ed5	203
1da177e4 LT	204	/* if we haven't irq we fallback for compatibility reasons - this used to be a separate function in drm_dma.h */
1da177e4 LT	205
c60ce623	206	if (copy_from_user(&ctl, (struct drm_control __user *) arg, sizeof(ctl)))
1da177e4 LT	207	return -EFAULT;
1da177e4 LT	208
b5e89ed5	209	switch (ctl.func) {
1da177e4 LT	210	case DRM_INST_HANDLER:
	211	if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
	212	return 0;
	213	if (dev->if_version < DRM_IF_VERSION(1, 2) &&
	214	ctl.irq != dev->irq)
	215	return -EINVAL;
b5e89ed5	216	return drm_irq_install(dev);
1da177e4 LT	217	case DRM_UNINST_HANDLER:
	218	if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
	219	return 0;
b5e89ed5	220	return drm_irq_uninstall(dev);
1da177e4 LT	221	default:
	222	return -EINVAL;
	223	}
	224	}
	225
	226	/**
	227	* Wait for VBLANK.
	228	*
	229	* \param inode device inode.
	230	* \param filp file pointer.
	231	* \param cmd command.
	232	* \param data user argument, pointing to a drm_wait_vblank structure.
	233	* \return zero on success or a negative number on failure.
	234	*
b5e89ed5	235	* Verifies the IRQ is installed.
1da177e4 LT	236	*
	237	* If a signal is requested checks if this task has already scheduled the same signal
	238	* for the same vblank sequence number - nothing to be done in
	239	* that case. If the number of tasks waiting for the interrupt exceeds 100 the
	240	* function fails. Otherwise adds a new entry to drm_device::vbl_sigs for this
	241	* task.
	242	*
	243	* If a signal is not requested, then calls vblank_wait().
	244	*/
b5e89ed5	245	int drm_wait_vblank(DRM_IOCTL_ARGS)
1da177e4	246	{
84b1fd10 DA	247	struct drm_file *priv = filp->private_data;
84b1fd10 DA	248	struct drm_device *dev = priv->head->dev;
c60ce623 DA	249	union drm_wait_vblank __user argp = (void __user )data;
c60ce623 DA	250	union drm_wait_vblank vblwait;
1da177e4 LT	251	struct timeval now;
1da177e4 LT	252	int ret = 0;
ab285d74	253	unsigned int flags, seq;
1da177e4 LT	254
	255	if (!dev->irq)
	256	return -EINVAL;
	257
3d77461e DA	258	if (copy_from_user(&vblwait, argp, sizeof(vblwait)))
3d77461e DA	259	return -EFAULT;
1da177e4	260
776c9443 MCA	261	if (vblwait.request.type &
	262	~(_DRM_VBLANK_TYPES_MASK \| _DRM_VBLANK_FLAGS_MASK)) {
	263	DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n",
	264	vblwait.request.type,
	265	(_DRM_VBLANK_TYPES_MASK \| _DRM_VBLANK_FLAGS_MASK));
	266	return -EINVAL;
	267	}
	268
	269	flags = vblwait.request.type & _DRM_VBLANK_FLAGS_MASK;
	270
	271	if (!drm_core_check_feature(dev, (flags & _DRM_VBLANK_SECONDARY) ?
	272	DRIVER_IRQ_VBL2 : DRIVER_IRQ_VBL))
	273	return -EINVAL;
	274
ab285d74 MCA	275	seq = atomic_read((flags & _DRM_VBLANK_SECONDARY) ? &dev->vbl_received2
ab285d74 MCA	276	: &dev->vbl_received);
776c9443 MCA	277
776c9443 MCA	278	switch (vblwait.request.type & _DRM_VBLANK_TYPES_MASK) {
1da177e4	279	case _DRM_VBLANK_RELATIVE:
ab285d74	280	vblwait.request.sequence += seq;
1da177e4 LT	281	vblwait.request.type &= ~_DRM_VBLANK_RELATIVE;
	282	case _DRM_VBLANK_ABSOLUTE:
	283	break;
	284	default:
	285	return -EINVAL;
	286	}
	287
ab285d74 MCA	288	if ((flags & _DRM_VBLANK_NEXTONMISS) &&
	289	(seq - vblwait.request.sequence) <= (1<<23)) {
	290	vblwait.request.sequence = seq + 1;
	291	}
	292
b5e89ed5	293	if (flags & _DRM_VBLANK_SIGNAL) {
1da177e4	294	unsigned long irqflags;
bd1b331f	295	struct list_head *vbl_sigs = (flags & _DRM_VBLANK_SECONDARY)
776c9443	296	? &dev->vbl_sigs2 : &dev->vbl_sigs;
1da177e4	297	drm_vbl_sig_t *vbl_sig;
1da177e4	298
b5e89ed5	299	spin_lock_irqsave(&dev->vbl_lock, irqflags);
1da177e4 LT	300
	301	/* Check if this task has already scheduled the same signal
	302	* for the same vblank sequence number; nothing to be done in
	303	* that case
	304	*/
bd1b331f	305	list_for_each_entry(vbl_sig, vbl_sigs, head) {
1da177e4 LT	306	if (vbl_sig->sequence == vblwait.request.sequence
1da177e4 LT	307	&& vbl_sig->info.si_signo == vblwait.request.signal
b5e89ed5 DA	308	&& vbl_sig->task == current) {
	309	spin_unlock_irqrestore(&dev->vbl_lock,
	310	irqflags);
049b3233	311	vblwait.reply.sequence = seq;
1da177e4 LT	312	goto done;
	313	}
	314	}
	315
b5e89ed5 DA	316	if (dev->vbl_pending >= 100) {
b5e89ed5 DA	317	spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
1da177e4 LT	318	return -EBUSY;
	319	}
	320
	321	dev->vbl_pending++;
	322
b5e89ed5	323	spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
1da177e4	324
b5e89ed5 DA	325	if (!
	326	(vbl_sig =
	327	drm_alloc(sizeof(drm_vbl_sig_t), DRM_MEM_DRIVER))) {
1da177e4 LT	328	return -ENOMEM;
	329	}
	330
b5e89ed5	331	memset((void )vbl_sig, 0, sizeof(vbl_sig));
1da177e4 LT	332
	333	vbl_sig->sequence = vblwait.request.sequence;
	334	vbl_sig->info.si_signo = vblwait.request.signal;
	335	vbl_sig->task = current;
	336
b5e89ed5	337	spin_lock_irqsave(&dev->vbl_lock, irqflags);
1da177e4	338
bd1b331f	339	list_add_tail(&vbl_sig->head, vbl_sigs);
1da177e4	340
b5e89ed5	341	spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
049b3233 MCA	342
049b3233 MCA	343	vblwait.reply.sequence = seq;
1da177e4	344	} else {
776c9443 MCA	345	if (flags & _DRM_VBLANK_SECONDARY) {
	346	if (dev->driver->vblank_wait2)
	347	ret = dev->driver->vblank_wait2(dev, &vblwait.request.sequence);
	348	} else if (dev->driver->vblank_wait)
b5e89ed5 DA	349	ret =
	350	dev->driver->vblank_wait(dev,
	351	&vblwait.request.sequence);
1da177e4	352
b5e89ed5	353	do_gettimeofday(&now);
1da177e4 LT	354	vblwait.reply.tval_sec = now.tv_sec;
	355	vblwait.reply.tval_usec = now.tv_usec;
	356	}
	357
b5e89ed5	358	done:
3d77461e DA	359	if (copy_to_user(argp, &vblwait, sizeof(vblwait)))
3d77461e DA	360	return -EFAULT;
1da177e4 LT	361
	362	return ret;
	363	}
	364
	365	/**
	366	* Send the VBLANK signals.
	367	*
	368	* \param dev DRM device.
	369	*
	370	* Sends a signal for each task in drm_device::vbl_sigs and empties the list.
	371	*
	372	* If a signal is not requested, then calls vblank_wait().
	373	*/
84b1fd10	374	void drm_vbl_send_signals(struct drm_device * dev)
1da177e4	375	{
1da177e4	376	unsigned long flags;
776c9443	377	int i;
1da177e4	378
b5e89ed5	379	spin_lock_irqsave(&dev->vbl_lock, flags);
1da177e4	380
776c9443	381	for (i = 0; i < 2; i++) {
bd1b331f DA	382	drm_vbl_sig_t vbl_sig, tmp;
bd1b331f DA	383	struct list_head *vbl_sigs = i ? &dev->vbl_sigs2 : &dev->vbl_sigs;
776c9443 MCA	384	unsigned int vbl_seq = atomic_read(i ? &dev->vbl_received2 :
	385	&dev->vbl_received);
	386
bd1b331f	387	list_for_each_entry_safe(vbl_sig, tmp, vbl_sigs, head) {
776c9443 MCA	388	if ((vbl_seq - vbl_sig->sequence) <= (1 << 23)) {
	389	vbl_sig->info.si_code = vbl_seq;
	390	send_sig_info(vbl_sig->info.si_signo,
	391	&vbl_sig->info, vbl_sig->task);
1da177e4	392
bd1b331f	393	list_del(&vbl_sig->head);
1da177e4	394
776c9443 MCA	395	drm_free(vbl_sig, sizeof(*vbl_sig),
776c9443 MCA	396	DRM_MEM_DRIVER);
1da177e4	397
776c9443 MCA	398	dev->vbl_pending--;
776c9443 MCA	399	}
1da177e4 LT	400	}
	401	}
	402
b5e89ed5	403	spin_unlock_irqrestore(&dev->vbl_lock, flags);
1da177e4	404	}
1da177e4	405
b5e89ed5	406	EXPORT_SYMBOL(drm_vbl_send_signals);
2e54a007 MCA	407
	408	/**
	409	* Tasklet wrapper function.
	410	*
	411	* \param data DRM device in disguise.
	412	*
	413	* Attempts to grab the HW lock and calls the driver callback on success. On
	414	* failure, leave the lock marked as contended so the callback can be called
	415	* from drm_unlock().
	416	*/
	417	static void drm_locked_tasklet_func(unsigned long data)
	418	{
84b1fd10	419	struct drm_device dev = (struct drm_device )data;
2e54a007 MCA	420	unsigned long irqflags;
	421
	422	spin_lock_irqsave(&dev->tasklet_lock, irqflags);
	423
	424	if (!dev->locked_tasklet_func \|\|
040ac320	425	!drm_lock_take(&dev->lock,
2e54a007 MCA	426	DRM_KERNEL_CONTEXT)) {
	427	spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);
	428	return;
	429	}
	430
	431	dev->lock.lock_time = jiffies;
	432	atomic_inc(&dev->counts[_DRM_STAT_LOCKS]);
	433
	434	dev->locked_tasklet_func(dev);
	435
040ac320	436	drm_lock_free(&dev->lock,
2e54a007 MCA	437	DRM_KERNEL_CONTEXT);
	438
	439	dev->locked_tasklet_func = NULL;
	440
	441	spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);
	442	}
	443
	444	/**
	445	* Schedule a tasklet to call back a driver hook with the HW lock held.
	446	*
	447	* \param dev DRM device.
	448	* \param func Driver callback.
	449	*
	450	* This is intended for triggering actions that require the HW lock from an
	451	* interrupt handler. The lock will be grabbed ASAP after the interrupt handler
	452	* completes. Note that the callback may be called from interrupt or process
	453	* context, it must not make any assumptions about this. Also, the HW lock will
	454	* be held with the kernel context or any client context.
	455	*/
84b1fd10	456	void drm_locked_tasklet(struct drm_device dev, void (func)(struct drm_device *))
2e54a007 MCA	457	{
	458	unsigned long irqflags;
	459	static DECLARE_TASKLET(drm_tasklet, drm_locked_tasklet_func, 0);
	460
8163e418 MCA	461	if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ) \|\|
8163e418 MCA	462	test_bit(TASKLET_STATE_SCHED, &drm_tasklet.state))
2e54a007 MCA	463	return;
	464
	465	spin_lock_irqsave(&dev->tasklet_lock, irqflags);
	466
	467	if (dev->locked_tasklet_func) {
	468	spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);
	469	return;
	470	}
	471
	472	dev->locked_tasklet_func = func;
	473
	474	spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);
	475
	476	drm_tasklet.data = (unsigned long)dev;
	477
	478	tasklet_hi_schedule(&drm_tasklet);
	479	}
	480	EXPORT_SYMBOL(drm_locked_tasklet);