iwlwifi: adding interrupt counter in debugfs for debugging

This patch adds interrupt statistics report to debugfs, this can help to
understand number of interrupts happened which including HW/SW error for
easier and better debugging.

in /sys/kernel/debug/ieee80211/phyN/iwlagn/data directory
use "cat interrupt" to view the current interrupt counter
use "echo 0 > interrupt" to clear interrupt counter

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-dev.h b/drivers/net/wireless/iwlwifi/iwl-dev.h
index 59930f398f3..0922e33a7d4 100644
--- a/drivers/net/wireless/iwlwifi/iwl-dev.h
+++ b/drivers/net/wireless/iwlwifi/iwl-dev.h
@@ -819,6 +819,21 @@ enum {
 	MEASUREMENT_ACTIVE = (1 << 1),
 };
 
+/* interrupt statistics */
+struct isr_statistics {
+	u32 hw;
+	u32 sw;
+	u32 sw_err;
+	u32 sch;
+	u32 alive;
+	u32 rfkill;
+	u32 ctkill;
+	u32 wakeup;
+	u32 rx;
+	u32 rx_handlers[REPLY_MAX];
+	u32 tx;
+	u32 unhandled;
+};
 
 #define IWL_MAX_NUM_QUEUES	20 /* FIXME: do dynamic allocation */
 
@@ -975,6 +990,9 @@ struct iwl_priv {
 		u64 bytes;
 	} tx_stats[3], rx_stats[3];
 
+	/* counts interrupts */
+	struct isr_statistics isr_stats;
+
 	struct iwl_power_mgr power_data;
 
 	struct iwl_notif_statistics statistics;