bnxt_en: Event handler for Thermal event

Newer FW will send a new async event when it detects that
the chip's temperature has crossed the configured threshold value.
The driver will now notify hwmon and will log a warning message.

Link: https://lore.kernel.org/netdev/20230815045658.80494-13-michael.chan@broadcom.com/
Cc: Jean Delvare <jdelvare@suse.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: linux-hwmon@vger.kernel.org
Signed-off-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Acked-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnxt/bnxt.c

@@ -2129,6 +2129,24 @@ static u16 bnxt_agg_ring_id_to_grp_idx(struct bnxt *bp, u16 ring_id)
 	return INVALID_HW_RING_ID;
 }
 
+#define BNXT_EVENT_THERMAL_CURRENT_TEMP(data2)				\
+	((data2) &							\
+	  ASYNC_EVENT_CMPL_ERROR_REPORT_THERMAL_EVENT_DATA2_CURRENT_TEMP_MASK)
+
+#define BNXT_EVENT_THERMAL_THRESHOLD_TEMP(data2)			\
+	(((data2) &							\
+	  ASYNC_EVENT_CMPL_ERROR_REPORT_THERMAL_EVENT_DATA2_THRESHOLD_TEMP_MASK) >>\
+	 ASYNC_EVENT_CMPL_ERROR_REPORT_THERMAL_EVENT_DATA2_THRESHOLD_TEMP_SFT)
+
+#define EVENT_DATA1_THERMAL_THRESHOLD_TYPE(data1)			\
+	((data1) &							\
+	 ASYNC_EVENT_CMPL_ERROR_REPORT_THERMAL_EVENT_DATA1_THRESHOLD_TYPE_MASK)
+
+#define EVENT_DATA1_THERMAL_THRESHOLD_DIR_INCREASING(data1)		\
+	(((data1) &							\
+	  ASYNC_EVENT_CMPL_ERROR_REPORT_THERMAL_EVENT_DATA1_TRANSITION_DIR) ==\
+	 ASYNC_EVENT_CMPL_ERROR_REPORT_THERMAL_EVENT_DATA1_TRANSITION_DIR_INCREASING)
+
 static void bnxt_event_error_report(struct bnxt *bp, u32 data1, u32 data2)
 {
 	u32 err_type = BNXT_EVENT_ERROR_REPORT_TYPE(data1);
@@ -2144,6 +2162,40 @@ static void bnxt_event_error_report(struct bnxt *bp, u32 data1, u32 data2)
 	case ASYNC_EVENT_CMPL_ERROR_REPORT_BASE_EVENT_DATA1_ERROR_TYPE_DOORBELL_DROP_THRESHOLD:
 		netdev_warn(bp->dev, "One or more MMIO doorbells dropped by the device!\n");
 		break;
+	case ASYNC_EVENT_CMPL_ERROR_REPORT_BASE_EVENT_DATA1_ERROR_TYPE_THERMAL_THRESHOLD: {
+		u32 type = EVENT_DATA1_THERMAL_THRESHOLD_TYPE(data1);
+		char *threshold_type;
+		char *dir_str;
+
+		switch (type) {
+		case ASYNC_EVENT_CMPL_ERROR_REPORT_THERMAL_EVENT_DATA1_THRESHOLD_TYPE_WARN:
+			threshold_type = "warning";
+			break;
+		case ASYNC_EVENT_CMPL_ERROR_REPORT_THERMAL_EVENT_DATA1_THRESHOLD_TYPE_CRITICAL:
+			threshold_type = "critical";
+			break;
+		case ASYNC_EVENT_CMPL_ERROR_REPORT_THERMAL_EVENT_DATA1_THRESHOLD_TYPE_FATAL:
+			threshold_type = "fatal";
+			break;
+		case ASYNC_EVENT_CMPL_ERROR_REPORT_THERMAL_EVENT_DATA1_THRESHOLD_TYPE_SHUTDOWN:
+			threshold_type = "shutdown";
+			break;
+		default:
+			netdev_err(bp->dev, "Unknown Thermal threshold type event\n");
+			return;
+		}
+		if (EVENT_DATA1_THERMAL_THRESHOLD_DIR_INCREASING(data1))
+			dir_str = "above";
+		else
+			dir_str = "below";
+		netdev_warn(bp->dev, "Chip temperature has gone %s the %s thermal threshold!\n",
+			    dir_str, threshold_type);
+		netdev_warn(bp->dev, "Temperature (In Celsius), Current: %lu, threshold: %lu\n",
+			    BNXT_EVENT_THERMAL_CURRENT_TEMP(data2),
+			    BNXT_EVENT_THERMAL_THRESHOLD_TEMP(data2));
+		bnxt_hwmon_notify_event(bp, type);
+		break;
+	}
 	default:
 		netdev_err(bp->dev, "FW reported unknown error type %u\n",
 			   err_type);

drivers/net/ethernet/broadcom/bnxt/bnxt_hwmon.c

@@ -18,6 +18,31 @@
 #include "bnxt_hwrm.h"
 #include "bnxt_hwmon.h"
 
+void bnxt_hwmon_notify_event(struct bnxt *bp, u32 type)
+{
+	u32 attr;
+
+	if (!bp->hwmon_dev)
+		return;
+
+	switch (type) {
+	case ASYNC_EVENT_CMPL_ERROR_REPORT_THERMAL_EVENT_DATA1_THRESHOLD_TYPE_WARN:
+		attr = hwmon_temp_max_alarm;
+		break;
+	case ASYNC_EVENT_CMPL_ERROR_REPORT_THERMAL_EVENT_DATA1_THRESHOLD_TYPE_CRITICAL:
+		attr = hwmon_temp_crit_alarm;
+		break;
+	case ASYNC_EVENT_CMPL_ERROR_REPORT_THERMAL_EVENT_DATA1_THRESHOLD_TYPE_FATAL:
+	case ASYNC_EVENT_CMPL_ERROR_REPORT_THERMAL_EVENT_DATA1_THRESHOLD_TYPE_SHUTDOWN:
+		attr = hwmon_temp_emergency_alarm;
+		break;
+	default:
+		return;
+	}
+
+	hwmon_notify_event(&bp->pdev->dev, hwmon_temp, attr, 0);
+}
+
 static int bnxt_hwrm_temp_query(struct bnxt *bp, u8 *temp)
 {
 	struct hwrm_temp_monitor_query_output *resp;

drivers/net/ethernet/broadcom/bnxt/bnxt_hwmon.h

@@ -11,9 +11,14 @@
 #define BNXT_HWMON_H
 
 #ifdef CONFIG_BNXT_HWMON
+void bnxt_hwmon_notify_event(struct bnxt *bp, u32 type);
 void bnxt_hwmon_uninit(struct bnxt *bp);
 void bnxt_hwmon_init(struct bnxt *bp);
 #else
+static inline void bnxt_hwmon_notify_event(struct bnxt *bp, u32 type)
+{
+}
+
 static inline void bnxt_hwmon_uninit(struct bnxt *bp)
 {
 }