net/mlx5: Add sensor name to temperature event message

Previously, a temperature event message included a bitmap indicating
which sensors detect high temperatures.

To enhance clarity, we modify the message format to explicitly list
the names of the overheating sensors, alongside the sensors bitmap.
If HWMON is not configured, the event message remains unchanged.

Signed-off-by: Shahar Shitrit <shshitrit@nvidia.com>
Reviewed-by: Carolina Jubran <cjubran@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250213094641.226501-5-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/mellanox/mlx5/core/events.c

@@ -6,6 +6,7 @@
 #include "mlx5_core.h"
 #include "lib/eq.h"
 #include "lib/events.h"
+#include "hwmon.h"
 
 struct mlx5_event_nb {
 	struct mlx5_nb  nb;
@@ -153,11 +154,28 @@ static int any_notifier(struct notifier_block *nb,
 	return NOTIFY_OK;
 }
 
+#if IS_ENABLED(CONFIG_HWMON)
+static void print_sensor_names_in_bit_set(struct mlx5_core_dev *dev, struct mlx5_hwmon *hwmon,
+					  u64 bit_set, int bit_set_offset)
+{
+	unsigned long *bit_set_ptr = (unsigned long *)&bit_set;
+	int num_bits = sizeof(bit_set) * BITS_PER_BYTE;
+	int i;
+
+	for_each_set_bit(i, bit_set_ptr, num_bits) {
+		const char *sensor_name = hwmon_get_sensor_name(hwmon, i + bit_set_offset);
+
+		mlx5_core_warn(dev, "Sensor name[%d]: %s\n", i + bit_set_offset, sensor_name);
+	}
+}
+#endif /* CONFIG_HWMON */
+
 /* type == MLX5_EVENT_TYPE_TEMP_WARN_EVENT */
 static int temp_warn(struct notifier_block *nb, unsigned long type, void *data)
 {
 	struct mlx5_event_nb *event_nb = mlx5_nb_cof(nb, struct mlx5_event_nb, nb);
 	struct mlx5_events   *events   = event_nb->ctx;
+	struct mlx5_core_dev *dev      = events->dev;
 	struct mlx5_eqe      *eqe      = data;
 	u64 value_lsb;
 	u64 value_msb;
@@ -169,10 +187,17 @@ static int temp_warn(struct notifier_block *nb, unsigned long type, void *data)
 	value_lsb &= 0x1;
 	value_msb = be64_to_cpu(eqe->data.temp_warning.sensor_warning_msb);
 
-	if (net_ratelimit())
-		mlx5_core_warn(events->dev,
-			       "High temperature on sensors with bit set %#llx %#llx",
+	if (net_ratelimit()) {
+		mlx5_core_warn(dev, "High temperature on sensors with bit set %#llx %#llx.\n",
 			       value_msb, value_lsb);
+#if IS_ENABLED(CONFIG_HWMON)
+		if (dev->hwmon) {
+			print_sensor_names_in_bit_set(dev, dev->hwmon, value_lsb, 0);
+			print_sensor_names_in_bit_set(dev, dev->hwmon, value_msb,
+						      sizeof(value_lsb) * BITS_PER_BYTE);
+		}
+#endif
+	}
 
 	return NOTIFY_OK;
 }

drivers/net/ethernet/mellanox/mlx5/core/hwmon.c

@@ -416,3 +416,8 @@ void mlx5_hwmon_dev_unregister(struct mlx5_core_dev *mdev)
 	mlx5_hwmon_free(hwmon);
 	mdev->hwmon = NULL;
 }
+
+const char *hwmon_get_sensor_name(struct mlx5_hwmon *hwmon, int channel)
+{
+	return hwmon->temp_channel_desc[channel].sensor_name;
+}

drivers/net/ethernet/mellanox/mlx5/core/hwmon.h

@@ -10,6 +10,7 @@
 
 int mlx5_hwmon_dev_register(struct mlx5_core_dev *mdev);
 void mlx5_hwmon_dev_unregister(struct mlx5_core_dev *mdev);
+const char *hwmon_get_sensor_name(struct mlx5_hwmon *hwmon, int channel);
 
 #else
 static inline int mlx5_hwmon_dev_register(struct mlx5_core_dev *mdev)