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bus: brcmstb_gisb: add notifier handling

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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: Doug Berger <opendmb@gmail.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
This commit is contained in:
Doug Berger 2017-03-29 17:29:11 -07:00 committed by Florian Fainelli
parent 0c2aa0e4b3
commit 9eb60880d9
1 changed files with 39 additions and 0 deletions
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39
drivers/bus/brcmstb_gisb.c
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@ -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);