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Commit 1e3e9f6c authored by Teng Fei Fan's avatar Teng Fei Fan Committed by Maria Yu
Browse files

drivers: GIC: Enable logging of intertupts that triggered wakeup 



This change enables logging of irq number and name which triggered
wake up of the system from deep sleep. This helps in debugging the
spurious wakeups due to interrupts from various subsystems.

Change-Id: I3a5bc76bf6dc7a37599d19f8a8255043c4138d5b
Signed-off-by: default avatarTeng Fei Fan <tengfei@codeaurora.org>
Signed-off-by: default avatarMaria Yu <aiquny@codeaurora.org>
parent cdf2b97e

drivers/irqchip/irq-gic.c

+65 −0
Original line number Diff line number Diff line
@@ -48,6 +48,7 @@ 
#include <asm/smp_plat.h>

#include <asm/virt.h>



#include <linux/syscore_ops.h>

#include "irq-gic-common.h"



#ifdef CONFIG_ARM64
@@ -1232,6 +1233,70 @@ static int __init __gic_init_bases(struct gic_chip_data *gic, 
	return ret;

}



#ifdef CONFIG_PM

static int gic_suspend(void)

{

	return 0;

}



static void gic_show_resume_irq(struct gic_chip_data *gic)

{

	unsigned int i;

	u32 enabled;

	u32 pending[32];

	void __iomem *base = gic_data_dist_base(gic);



	if (!msm_show_resume_irq_mask)

		return;



	for (i = 0; i * 32 < gic->gic_irqs; i++) {

		enabled = readl_relaxed(base + GIC_DIST_ENABLE_CLEAR + i * 4);

		pending[i] = readl_relaxed(base + GIC_DIST_PENDING_SET + i * 4);

		pending[i] &= enabled;

	}



	for (i = find_first_bit((unsigned long *)pending, gic->gic_irqs);

	i < gic->gic_irqs;

	i = find_next_bit((unsigned long *)pending, gic->gic_irqs, i+1)) {

		unsigned int irq = irq_find_mapping(gic->domain, i);

		struct irq_desc *desc = irq_to_desc(irq);

		const char *name = "null";



		if (desc == NULL)

			name = "stray irq";

		else if (desc->action && desc->action->name)

			name = desc->action->name;



		pr_warn("%s: %d triggered %s\n", __func__, i, name);

	}

}



static void gic_resume_one(struct gic_chip_data *gic)

{

	gic_show_resume_irq(gic);

}



static void gic_resume(void)

{

	int i;



	for (i = 0; i < CONFIG_ARM_GIC_MAX_NR; i++)

		gic_resume_one(&gic_data[i]);

}



static struct syscore_ops gic_syscore_ops = {

	.suspend = gic_suspend,

	.resume = gic_resume,

};



static int __init gic_init_sys(void)

{

	register_syscore_ops(&gic_syscore_ops);

	return 0;

}

arch_initcall(gic_init_sys);

#endif



void __init gic_init(unsigned int gic_nr, int irq_start,

		     void __iomem *dist_base, void __iomem *cpu_base)

{