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Commit 0fdb4b25 authored by David Daney's avatar David Daney Committed by Thomas Gleixner
Browse files

genirq: Add chip hooks for taking CPUs on/off line. 



[ tglx: Removed the enabled argument as this is now available in
irq_data ]

Signed-off-by: default avatarDavid Daney <ddaney@caviumnetworks.com>
Cc: linux-mips@linux-mips.org
Cc: ralf@linux-mips.org
LKML-Reference: <1301081931-11240-3-git-send-email-ddaney@caviumnetworks.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 801a0e9a

include/linux/irq.h

+8 −0
Original line number Diff line number Diff line
@@ -279,6 +279,8 @@ static inline bool irqd_irq_disabled(struct irq_data *d) 
 * @irq_set_wake:	enable/disable power-management wake-on of an IRQ

 * @irq_bus_lock:	function to lock access to slow bus (i2c) chips

 * @irq_bus_sync_unlock:function to sync and unlock slow bus (i2c) chips

 * @irq_cpu_online:	configure an interrupt source for a secondary CPU

 * @irq_cpu_offline:	un-configure an interrupt source for a secondary CPU

 * @irq_print_chip:	optional to print special chip info in show_interrupts

 * @flags:		chip specific flags

 *
@@ -327,6 +329,9 @@ struct irq_chip { 
	void		(*irq_bus_lock)(struct irq_data *data);

	void		(*irq_bus_sync_unlock)(struct irq_data *data);



	void		(*irq_cpu_online)(struct irq_data *data);

	void		(*irq_cpu_offline)(struct irq_data *data);



	void		(*irq_print_chip)(struct irq_data *data, struct seq_file *p);



	unsigned long	flags;
@@ -372,6 +377,9 @@ struct irqaction; 
extern int setup_irq(unsigned int irq, struct irqaction *new);

extern void remove_irq(unsigned int irq, struct irqaction *act);



extern void irq_cpu_online(void);

extern void irq_cpu_offline(void);



#ifdef CONFIG_GENERIC_HARDIRQS



#if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_PENDING_IRQ)

kernel/irq/chip.c

+58 −0
Original line number Diff line number Diff line
@@ -696,3 +696,61 @@ void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set) 


	irq_put_desc_unlock(desc, flags);

}



/**

 *	irq_cpu_online - Invoke all irq_cpu_online functions.

 *

 *	Iterate through all irqs and invoke the chip.irq_cpu_online()

 *	for each.

 */

void irq_cpu_online(void)

{

	struct irq_desc *desc;

	struct irq_chip *chip;

	unsigned long flags;

	unsigned int irq;



	for_each_active_irq(irq) {

		desc = irq_to_desc(irq);

		if (!desc)

			continue;



		raw_spin_lock_irqsave(&desc->lock, flags);



		chip = irq_data_get_irq_chip(&desc->irq_data);



		if (chip && chip->irq_cpu_online)

			chip->irq_cpu_online(&desc->irq_data);



		raw_spin_unlock_irqrestore(&desc->lock, flags);

	}

}



/**

 *	irq_cpu_offline - Invoke all irq_cpu_offline functions.

 *

 *	Iterate through all irqs and invoke the chip.irq_cpu_offline()

 *	for each.

 */

void irq_cpu_offline(void)

{

	struct irq_desc *desc;

	struct irq_chip *chip;

	unsigned long flags;

	unsigned int irq;



	for_each_active_irq(irq) {

		desc = irq_to_desc(irq);

		if (!desc)

			continue;



		raw_spin_lock_irqsave(&desc->lock, flags);



		chip = irq_data_get_irq_chip(&desc->irq_data);



		if (chip && chip->irq_cpu_offline)

			chip->irq_cpu_offline(&desc->irq_data);



		raw_spin_unlock_irqrestore(&desc->lock, flags);

	}

}