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Commit 9eb60880 authored by Doug Berger's avatar Doug Berger Committed by Florian Fainelli
Browse files

bus: brcmstb_gisb: add notifier handling 



Check for GISB arbitration errors through a chained notifier
when a process dies or a kernel panic occurs.  This allows a
meaningful GISB diagnostic message to occur along with other
diagnostic information from the event.

Signed-off-by: default avatarDoug Berger <opendmb@gmail.com>
Signed-off-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
parent 0c2aa0e4

drivers/bus/brcmstb_gisb.c

+39 −0
Original line number Diff line number Diff line
@@ -24,6 +24,9 @@ 
#include <linux/of.h>

#include <linux/bitops.h>

#include <linux/pm.h>

#include <linux/kernel.h>

#include <linux/kdebug.h>

#include <linux/notifier.h>



#ifdef CONFIG_ARM

#include <asm/bug.h>
@@ -283,6 +286,36 @@ static irqreturn_t brcmstb_gisb_tea_handler(int irq, void *dev_id) 
	return IRQ_HANDLED;

}



/*

 * Dump out gisb errors on die or panic.

 */

static int dump_gisb_error(struct notifier_block *self, unsigned long v,

			   void *p);



static struct notifier_block gisb_die_notifier = {

	.notifier_call = dump_gisb_error,

};



static struct notifier_block gisb_panic_notifier = {

	.notifier_call = dump_gisb_error,

};



static int dump_gisb_error(struct notifier_block *self, unsigned long v,

			   void *p)

{

	struct brcmstb_gisb_arb_device *gdev;

	const char *reason = "panic";



	if (self == &gisb_die_notifier)

		reason = "die";



	/* iterate over each GISB arb registered handlers */

	list_for_each_entry(gdev, &brcmstb_gisb_arb_device_list, next)

		brcmstb_gisb_arb_decode_addr(gdev, reason);



	return NOTIFY_DONE;

}



static DEVICE_ATTR(gisb_arb_timeout, S_IWUSR | S_IRUGO,

		gisb_arb_get_timeout, gisb_arb_set_timeout);
@@ -390,6 +423,12 @@ static int __init brcmstb_gisb_arb_probe(struct platform_device *pdev) 
	board_be_handler = brcmstb_bus_error_handler;

#endif



	if (list_is_singular(&brcmstb_gisb_arb_device_list)) {

		register_die_notifier(&gisb_die_notifier);

		atomic_notifier_chain_register(&panic_notifier_list,

					       &gisb_panic_notifier);

	}



	dev_info(&pdev->dev, "registered mem: %p, irqs: %d, %d\n",

			gdev->base, timeout_irq, tea_irq);