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author | Doug Berger <opendmb@gmail.com> | 2017-03-29 17:29:11 -0700 |
---|---|---|
committer | Florian Fainelli <f.fainelli@gmail.com> | 2017-05-13 20:18:55 -0700 |
commit | 9eb60880d9a9716d113746ac9daba11005abc22a (patch) | |
tree | 4d0d3bbf339fc9a3e7a521e5a404ea1599f1ae22 | |
parent | 0c2aa0e4b308815e877601845c1a89913f9bd2b9 (diff) | |
download | linux-9eb60880d9a9716d113746ac9daba11005abc22a.tar.gz linux-9eb60880d9a9716d113746ac9daba11005abc22a.tar.bz2 linux-9eb60880d9a9716d113746ac9daba11005abc22a.zip |
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: Doug Berger <opendmb@gmail.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
-rw-r--r-- | drivers/bus/brcmstb_gisb.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/drivers/bus/brcmstb_gisb.c b/drivers/bus/brcmstb_gisb.c index 017c37b9c7c1..a2e1c5c25a3a 100644 --- a/drivers/bus/brcmstb_gisb.c +++ b/drivers/bus/brcmstb_gisb.c @@ -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); |