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Commit 58fe01c0 authored by Cassidy Burden's avatar Cassidy Burden
Browse files

irqchip: gic-v3: Add panic handler to save registers 



Save gic-v3 distributor registers on panic. Allows for inspection of
gic-v3 state at the time of a panic.

Change-Id: I3236577161abab4e292a01254e1e1ecb50bb38de
Signed-off-by: default avatarCassidy Burden <cburden@codeaurora.org>
parent d231399e

drivers/irqchip/irq-gic-v3.c

+31 −0
Original line number Diff line number Diff line
@@ -48,6 +48,10 @@ struct gic_chip_data { 
	unsigned int wakeup_irqs[32];

	unsigned int enabled_irqs[32];

#endif

#ifdef CONFIG_ARM_GIC_PANIC_HANDLER

	u32 saved_dist_regs[0x400];

	u32 saved_router_regs[0x800];

#endif

};



static struct gic_chip_data gic_data __read_mostly;
@@ -302,6 +306,29 @@ static inline void __iomem *gic_data_dist_base(struct gic_chip_data *data) 
	return data->dist_base;

}



#ifdef CONFIG_ARM_GIC_PANIC_HANDLER

static int gic_panic_handler(struct notifier_block *this,

			unsigned long event, void *ptr)

{

	int i;

	void __iomem *base;



	base = gic_data.dist_base;

	for (i = 0; i < 0x400; i += 1)

		gic_data.saved_dist_regs[i] = readl_relaxed(base + 4 * i);



	base = gic_data.dist_base + GICD_IROUTER;

	for (i = 0; i < 0x800; i += 1)

		gic_data.saved_router_regs[i] = readl_relaxed(base + 4 * i);



	return NOTIFY_DONE;

}



static struct notifier_block gic_panic_blk = {

	.notifier_call = gic_panic_handler,

};

#endif



#ifdef CONFIG_PM

static int gic_suspend_one(struct gic_chip_data *gic)

{
@@ -864,6 +891,10 @@ static int __init gic_of_init(struct device_node *node, struct device_node *pare 
	gic_cpu_init();

	gic_cpu_pm_init();



#ifdef CONFIG_ARM_GIC_PANIC_HANDLER

	atomic_notifier_chain_register(&panic_notifier_list, &gic_panic_blk);

#endif



	return 0;



out_free: