aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/bus
diff options
context:
space:
mode:
authorDoug Berger <opendmb@gmail.com>2017-03-29 17:29:11 -0700
committerFlorian Fainelli <f.fainelli@gmail.com>2017-05-13 20:18:55 -0700
commit9eb60880d9a9716d113746ac9daba11005abc22a (patch)
tree4d0d3bbf339fc9a3e7a521e5a404ea1599f1ae22 /drivers/bus
parent0c2aa0e4b308815e877601845c1a89913f9bd2b9 (diff)
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>
Diffstat (limited to 'drivers/bus')
-rw-r--r--drivers/bus/brcmstb_gisb.c39
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);

Privacy Policy