bnxt_en: Expose threshold temperatures through hwmon

HWRM_TEMP_MONITOR_QUERY response now indicates various
threshold temperatures. Expose these threshold temperatures
through the hwmon sysfs using this mapping:

hwmon_temp_max : bp->warn_thresh_temp
hwmon_temp_crit : bp->crit_thresh_temp
hwmon_temp_emergency : bp->fatal_thresh_temp

hwmon_temp_max_alarm : temp >= bp->warn_thresh_temp
hwmon_temp_crit_alarm : temp >= bp->crit_thresh_temp
hwmon_temp_emergency_alarm : temp >= bp->fatal_thresh_temp

Link: https://lore.kernel.org/netdev/20230815045658.80494-12-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.h

@@ -2013,6 +2013,7 @@ struct bnxt {
 	#define BNXT_FW_CAP_RING_MONITOR		BIT_ULL(30)
 	#define BNXT_FW_CAP_DBG_QCAPS			BIT_ULL(31)
 	#define BNXT_FW_CAP_PTP				BIT_ULL(32)
+	#define BNXT_FW_CAP_THRESHOLD_TEMP_SUPPORTED	BIT_ULL(33)
 
 	u32			fw_dbg_cap;
 
@@ -2185,7 +2186,13 @@ struct bnxt {
 	struct bnxt_tc_info	*tc_info;
 	struct list_head	tc_indr_block_list;
 	struct dentry		*debugfs_pdev;
+#ifdef CONFIG_BNXT_HWMON
 	struct device		*hwmon_dev;
+	u8			warn_thresh_temp;
+	u8			crit_thresh_temp;
+	u8			fatal_thresh_temp;
+	u8			shutdown_thresh_temp;
+#endif
 	enum board_idx		board_idx;
 };
 

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

@@ -32,8 +32,16 @@ static int bnxt_hwrm_temp_query(struct bnxt *bp, u8 *temp)
 	if (rc)
 		goto drop_req;
 
-	*temp = resp->temp;
-
+	if (temp) {
+		*temp = resp->temp;
+	} else if (resp->flags &
+		   TEMP_MONITOR_QUERY_RESP_FLAGS_THRESHOLD_VALUES_AVAILABLE) {
+		bp->fw_cap |= BNXT_FW_CAP_THRESHOLD_TEMP_SUPPORTED;
+		bp->warn_thresh_temp = resp->warn_threshold;
+		bp->crit_thresh_temp = resp->critical_threshold;
+		bp->fatal_thresh_temp = resp->fatal_threshold;
+		bp->shutdown_thresh_temp = resp->shutdown_threshold;
+	}
 drop_req:
 	hwrm_req_drop(bp, req);
 	return rc;
@@ -42,12 +50,23 @@ static int bnxt_hwrm_temp_query(struct bnxt *bp, u8 *temp)
 static umode_t bnxt_hwmon_is_visible(const void *_data, enum hwmon_sensor_types type,
 				     u32 attr, int channel)
 {
+	const struct bnxt *bp = _data;
+
 	if (type != hwmon_temp)
 		return 0;
 
 	switch (attr) {
 	case hwmon_temp_input:
 		return 0444;
+	case hwmon_temp_max:
+	case hwmon_temp_crit:
+	case hwmon_temp_emergency:
+	case hwmon_temp_max_alarm:
+	case hwmon_temp_crit_alarm:
+	case hwmon_temp_emergency_alarm:
+		if (!(bp->fw_cap & BNXT_FW_CAP_THRESHOLD_TEMP_SUPPORTED))
+			return 0;
+		return 0444;
 	default:
 		return 0;
 	}
@@ -66,13 +85,39 @@ static int bnxt_hwmon_read(struct device *dev, enum hwmon_sensor_types type, u32
 		if (!rc)
 			*val = temp * 1000;
 		return rc;
+	case hwmon_temp_max:
+		*val = bp->warn_thresh_temp * 1000;
+		return 0;
+	case hwmon_temp_crit:
+		*val = bp->crit_thresh_temp * 1000;
+		return 0;
+	case hwmon_temp_emergency:
+		*val = bp->fatal_thresh_temp * 1000;
+		return 0;
+	case hwmon_temp_max_alarm:
+		rc = bnxt_hwrm_temp_query(bp, &temp);
+		if (!rc)
+			*val = temp >= bp->warn_thresh_temp;
+		return rc;
+	case hwmon_temp_crit_alarm:
+		rc = bnxt_hwrm_temp_query(bp, &temp);
+		if (!rc)
+			*val = temp >= bp->crit_thresh_temp;
+		return rc;
+	case hwmon_temp_emergency_alarm:
+		rc = bnxt_hwrm_temp_query(bp, &temp);
+		if (!rc)
+			*val = temp >= bp->fatal_thresh_temp;
+		return rc;
 	default:
 		return -EOPNOTSUPP;
 	}
 }
 
 static const struct hwmon_channel_info *bnxt_hwmon_info[] = {
-	HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT),
+	HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT |
+			   HWMON_T_EMERGENCY | HWMON_T_MAX_ALARM |
+			   HWMON_T_CRIT_ALARM | HWMON_T_EMERGENCY_ALARM),
 	NULL
 };
 
@@ -96,13 +141,11 @@ void bnxt_hwmon_uninit(struct bnxt *bp)
 
 void bnxt_hwmon_init(struct bnxt *bp)
 {
-	struct hwrm_temp_monitor_query_input *req;
 	struct pci_dev *pdev = bp->pdev;
 	int rc;
 
-	rc = hwrm_req_init(bp, req, HWRM_TEMP_MONITOR_QUERY);
-	if (!rc)
-		rc = hwrm_req_send_silent(bp, req);
+	/* temp1_xxx is only sensor, ensure not registered if it will fail */
+	rc = bnxt_hwrm_temp_query(bp, NULL);
 	if (rc == -EACCES || rc == -EOPNOTSUPP) {
 		bnxt_hwmon_uninit(bp);
 		return;