Merge branch 'mlxsw-line-card-status-tracking'

Ido Schimmel says:

====================
mlxsw: Line cards status tracking

When a line card is provisioned, netdevs corresponding to the ports
found on the line card are registered. User space can then perform
various logical configurations (e.g., splitting, setting MTU) on these
netdevs.

However, since the line card is not present / powered on (i.e., it is
not in 'active' state), user space cannot access the various components
found on the line card. For example, user space cannot read the
temperature of gearboxes or transceiver modules found on the line card
via hwmon / thermal. Similarly, it cannot dump the EEPROM contents of
these transceiver modules. The above is only possible when the line card
becomes active.

This patchset solves the problem by tracking the status of each line
card and invoking callbacks from interested parties when a line card
becomes active / inactive.

Patchset overview:

Patch #1 adds the infrastructure in the line cards core that allows
users to registers a set of callbacks that are invoked when a line card
becomes active / inactive. To avoid races, if a line card is already
active during registration, the got_active() callback is invoked.

Patches #2-#3 are preparations.

Patch #4 changes the port module core to register a set of callbacks
with the line cards core. See detailed description with examples in the
commit message.

Patches #5-#6 do the same with regards to thermal / hwmon support, so
that user space will be able to monitor the temperature of various
components on the line card when it becomes active.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

7 files changed, 513 insertions, 18 deletions

diff --git a/drivers/net/ethernet/mellanox/mlxsw/core.c b/drivers/net/ethernet/mellanox/mlxsw/core.c
index 0e92dd91eca4..fc52832241b3 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/core.c
@@ -2175,7 +2175,7 @@ __mlxsw_core_bus_device_register(const struct mlxsw_bus_info *mlxsw_bus_info,
 	if (err)
 		goto err_thermal_init;
 
-	err = mlxsw_env_init(mlxsw_core, &mlxsw_core->env);
+	err = mlxsw_env_init(mlxsw_core, mlxsw_bus_info, &mlxsw_core->env);
 	if (err)
 		goto err_env_init;
 
diff --git a/drivers/net/ethernet/mellanox/mlxsw/core.h b/drivers/net/ethernet/mellanox/mlxsw/core.h
index 850fff51b79f..c2a891287047 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/core.h
@@ -590,6 +590,8 @@ struct mlxsw_linecards {
 	const struct mlxsw_bus_info *bus_info;
 	u8 count;
 	struct mlxsw_linecard_types_info *types_info;
+	struct list_head event_ops_list;
+	struct mutex event_ops_list_lock; /* Locks accesses to event ops list */
 	struct mlxsw_linecard linecards[];
 };
 
@@ -603,4 +605,19 @@ int mlxsw_linecards_init(struct mlxsw_core *mlxsw_core,
 			 const struct mlxsw_bus_info *bus_info);
 void mlxsw_linecards_fini(struct mlxsw_core *mlxsw_core);
 
+typedef void mlxsw_linecards_event_op_t(struct mlxsw_core *mlxsw_core,
+					u8 slot_index, void *priv);
+
+struct mlxsw_linecards_event_ops {
+	mlxsw_linecards_event_op_t *got_active;
+	mlxsw_linecards_event_op_t *got_inactive;
+};
+
+int mlxsw_linecards_event_ops_register(struct mlxsw_core *mlxsw_core,
+				       struct mlxsw_linecards_event_ops *ops,
+				       void *priv);
+void mlxsw_linecards_event_ops_unregister(struct mlxsw_core *mlxsw_core,
+					  struct mlxsw_linecards_event_ops *ops,
+					  void *priv);
+
 #endif
diff --git a/drivers/net/ethernet/mellanox/mlxsw/core_env.c b/drivers/net/ethernet/mellanox/mlxsw/core_env.c
index b3b8a9015cd6..34bec9cd572c 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core_env.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/core_env.c
@@ -23,17 +23,37 @@ struct mlxsw_env_module_info {
 
 struct mlxsw_env_line_card {
 	u8 module_count;
+	bool active;
 	struct mlxsw_env_module_info module_info[];
 };
 
 struct mlxsw_env {
 	struct mlxsw_core *core;
+	const struct mlxsw_bus_info *bus_info;
 	u8 max_module_count; /* Maximum number of modules per-slot. */
 	u8 num_of_slots; /* Including the main board. */
 	struct mutex line_cards_lock; /* Protects line cards. */
 	struct mlxsw_env_line_card *line_cards[];
 };
 
+static bool __mlxsw_env_linecard_is_active(struct mlxsw_env *mlxsw_env,
+					   u8 slot_index)
+{
+	return mlxsw_env->line_cards[slot_index]->active;
+}
+
+static bool mlxsw_env_linecard_is_active(struct mlxsw_env *mlxsw_env,
+					 u8 slot_index)
+{
+	bool active;
+
+	mutex_lock(&mlxsw_env->line_cards_lock);
+	active = __mlxsw_env_linecard_is_active(mlxsw_env, slot_index);
+	mutex_unlock(&mlxsw_env->line_cards_lock);
+
+	return active;
+}
+
 static struct
 mlxsw_env_module_info *mlxsw_env_module_info_get(struct mlxsw_core *mlxsw_core,
 						 u8 slot_index, u8 module)
@@ -46,9 +66,13 @@ mlxsw_env_module_info *mlxsw_env_module_info_get(struct mlxsw_core *mlxsw_core,
 static int __mlxsw_env_validate_module_type(struct mlxsw_core *core,
 					    u8 slot_index, u8 module)
 {
+	struct mlxsw_env *mlxsw_env = mlxsw_core_env(core);
 	struct mlxsw_env_module_info *module_info;
 	int err;
 
+	if (!__mlxsw_env_linecard_is_active(mlxsw_env, slot_index))
+		return 0;
+
 	module_info = mlxsw_env_module_info_get(core, slot_index, module);
 	switch (module_info->type) {
 	case MLXSW_REG_PMTM_MODULE_TYPE_TWISTED_PAIR:
@@ -268,12 +292,18 @@ int mlxsw_env_get_module_info(struct net_device *netdev,
 			      struct mlxsw_core *mlxsw_core, u8 slot_index,
 			      int module, struct ethtool_modinfo *modinfo)
 {
+	struct mlxsw_env *mlxsw_env = mlxsw_core_env(mlxsw_core);
 	u8 module_info[MLXSW_REG_MCIA_EEPROM_MODULE_INFO_SIZE];
 	u16 offset = MLXSW_REG_MCIA_EEPROM_MODULE_INFO_SIZE;
 	u8 module_rev_id, module_id, diag_mon;
 	unsigned int read_size;
 	int err;
 
+	if (!mlxsw_env_linecard_is_active(mlxsw_env, slot_index)) {
+		netdev_err(netdev, "Cannot read EEPROM of module on an inactive line card\n");
+		return -EIO;
+	}
+
 	err = mlxsw_env_validate_module_type(mlxsw_core, slot_index, module);
 	if (err) {
 		netdev_err(netdev,
@@ -358,6 +388,7 @@ int mlxsw_env_get_module_eeprom(struct net_device *netdev,
 				int module, struct ethtool_eeprom *ee,
 				u8 *data)
 {
+	struct mlxsw_env *mlxsw_env = mlxsw_core_env(mlxsw_core);
 	int offset = ee->offset;
 	unsigned int read_size;
 	bool qsfp, cmis;
@@ -367,6 +398,11 @@ int mlxsw_env_get_module_eeprom(struct net_device *netdev,
 	if (!ee->len)
 		return -EINVAL;
 
+	if (!mlxsw_env_linecard_is_active(mlxsw_env, slot_index)) {
+		netdev_err(netdev, "Cannot read EEPROM of module on an inactive line card\n");
+		return -EIO;
+	}
+
 	memset(data, 0, ee->len);
 	/* Validate module identifier value. */
 	err = mlxsw_env_validate_cable_ident(mlxsw_core, slot_index, module,
@@ -427,10 +463,17 @@ mlxsw_env_get_module_eeprom_by_page(struct mlxsw_core *mlxsw_core,
 				    const struct ethtool_module_eeprom *page,
 				    struct netlink_ext_ack *extack)
 {
+	struct mlxsw_env *mlxsw_env = mlxsw_core_env(mlxsw_core);
 	u32 bytes_read = 0;
 	u16 device_addr;
 	int err;
 
+	if (!mlxsw_env_linecard_is_active(mlxsw_env, slot_index)) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "Cannot read EEPROM of module on an inactive line card");
+		return -EIO;
+	}
+
 	err = mlxsw_env_validate_module_type(mlxsw_core, slot_index, module);
 	if (err) {
 		NL_SET_ERR_MSG_MOD(extack, "EEPROM is not equipped on port module type");
@@ -496,6 +539,11 @@ int mlxsw_env_reset_module(struct net_device *netdev,
 	    !(req & (ETH_RESET_PHY << ETH_RESET_SHARED_SHIFT)))
 		return 0;
 
+	if (!mlxsw_env_linecard_is_active(mlxsw_env, slot_index)) {
+		netdev_err(netdev, "Cannot reset module on an inactive line card\n");
+		return -EIO;
+	}
+
 	mutex_lock(&mlxsw_env->line_cards_lock);
 
 	err = __mlxsw_env_validate_module_type(mlxsw_core, slot_index, module);
@@ -542,7 +590,7 @@ mlxsw_env_get_module_power_mode(struct mlxsw_core *mlxsw_core, u8 slot_index,
 	struct mlxsw_env_module_info *module_info;
 	char mcion_pl[MLXSW_REG_MCION_LEN];
 	u32 status_bits;
-	int err;
+	int err = 0;
 
 	mutex_lock(&mlxsw_env->line_cards_lock);
 
@@ -555,6 +603,10 @@ mlxsw_env_get_module_power_mode(struct mlxsw_core *mlxsw_core, u8 slot_index,
 	module_info = mlxsw_env_module_info_get(mlxsw_core, slot_index, module);
 	params->policy = module_info->power_mode_policy;
 
+	/* Avoid accessing an inactive line card, as it will result in an error. */
+	if (!__mlxsw_env_linecard_is_active(mlxsw_env, slot_index))
+		goto out;
+
 	mlxsw_reg_mcion_pack(mcion_pl, slot_index, module);
 	err = mlxsw_reg_query(mlxsw_core, MLXSW_REG(mcion), mcion_pl);
 	if (err) {
@@ -616,8 +668,16 @@ static int __mlxsw_env_set_module_power_mode(struct mlxsw_core *mlxsw_core,
 					     bool low_power,
 					     struct netlink_ext_ack *extack)
 {
+	struct mlxsw_env *mlxsw_env = mlxsw_core_env(mlxsw_core);
 	int err;
 
+	/* Avoid accessing an inactive line card, as it will result in an error.
+	 * Cached configuration will be applied by mlxsw_env_got_active() when
+	 * line card becomes active.
+	 */
+	if (!__mlxsw_env_linecard_is_active(mlxsw_env, slot_index))
+		return 0;
+
 	err = mlxsw_env_module_enable_set(mlxsw_core, slot_index, module, false);
 	if (err) {
 		NL_SET_ERR_MSG_MOD(extack, "Failed to disable module");
@@ -647,25 +707,16 @@ err_module_low_power_set:
 	return err;
 }
 
-int
-mlxsw_env_set_module_power_mode(struct mlxsw_core *mlxsw_core, u8 slot_index,
-				u8 module,
-				enum ethtool_module_power_mode_policy policy,
-				struct netlink_ext_ack *extack)
+static int
+mlxsw_env_set_module_power_mode_apply(struct mlxsw_core *mlxsw_core,
+				      u8 slot_index, u8 module,
+				      enum ethtool_module_power_mode_policy policy,
+				      struct netlink_ext_ack *extack)
 {
-	struct mlxsw_env *mlxsw_env = mlxsw_core_env(mlxsw_core);
 	struct mlxsw_env_module_info *module_info;
 	bool low_power;
 	int err = 0;
 
-	if (policy != ETHTOOL_MODULE_POWER_MODE_POLICY_HIGH &&
-	    policy != ETHTOOL_MODULE_POWER_MODE_POLICY_AUTO) {
-		NL_SET_ERR_MSG_MOD(extack, "Unsupported power mode policy");
-		return -EOPNOTSUPP;
-	}
-
-	mutex_lock(&mlxsw_env->line_cards_lock);
-
 	err = __mlxsw_env_validate_module_type(mlxsw_core, slot_index, module);
 	if (err) {
 		NL_SET_ERR_MSG_MOD(extack,
@@ -690,7 +741,29 @@ mlxsw_env_set_module_power_mode(struct mlxsw_core *mlxsw_core, u8 slot_index,
 out_set_policy:
 	module_info->power_mode_policy = policy;
 out:
+	return err;
+}
+
+int
+mlxsw_env_set_module_power_mode(struct mlxsw_core *mlxsw_core, u8 slot_index,
+				u8 module,
+				enum ethtool_module_power_mode_policy policy,
+				struct netlink_ext_ack *extack)
+{
+	struct mlxsw_env *mlxsw_env = mlxsw_core_env(mlxsw_core);
+	int err;
+
+	if (policy != ETHTOOL_MODULE_POWER_MODE_POLICY_HIGH &&
+	    policy != ETHTOOL_MODULE_POWER_MODE_POLICY_AUTO) {
+		NL_SET_ERR_MSG_MOD(extack, "Unsupported power mode policy");
+		return -EOPNOTSUPP;
+	}
+
+	mutex_lock(&mlxsw_env->line_cards_lock);
+	err = mlxsw_env_set_module_power_mode_apply(mlxsw_core, slot_index,
+						    module, policy, extack);
 	mutex_unlock(&mlxsw_env->line_cards_lock);
+
 	return err;
 }
 EXPORT_SYMBOL(mlxsw_env_set_module_power_mode);
@@ -1194,7 +1267,101 @@ mlxsw_env_module_type_set(struct mlxsw_core *mlxsw_core, u8 slot_index)
 	return 0;
 }
 
-int mlxsw_env_init(struct mlxsw_core *mlxsw_core, struct mlxsw_env **p_env)
+static void
+mlxsw_env_linecard_modules_power_mode_apply(struct mlxsw_core *mlxsw_core,
+					    struct mlxsw_env *env,
+					    u8 slot_index)
+{
+	int i;
+
+	for (i = 0; i < env->line_cards[slot_index]->module_count; i++) {
+		enum ethtool_module_power_mode_policy policy;
+		struct mlxsw_env_module_info *module_info;
+		struct netlink_ext_ack extack;
+		int err;
+
+		module_info = &env->line_cards[slot_index]->module_info[i];
+		policy = module_info->power_mode_policy;
+		err = mlxsw_env_set_module_power_mode_apply(mlxsw_core,
+							    slot_index, i,
+							    policy, &extack);
+		if (err)
+			dev_err(env->bus_info->dev, "%s\n", extack._msg);
+	}
+}
+
+static void
+mlxsw_env_got_active(struct mlxsw_core *mlxsw_core, u8 slot_index, void *priv)
+{
+	struct mlxsw_env *mlxsw_env = priv;
+	char mgpir_pl[MLXSW_REG_MGPIR_LEN];
+	int err;
+
+	mutex_lock(&mlxsw_env->line_cards_lock);
+	if (__mlxsw_env_linecard_is_active(mlxsw_env, slot_index))
+		goto out_unlock;
+
+	mlxsw_reg_mgpir_pack(mgpir_pl, slot_index);
+	err = mlxsw_reg_query(mlxsw_env->core, MLXSW_REG(mgpir), mgpir_pl);
+	if (err)
+		goto out_unlock;
+
+	mlxsw_reg_mgpir_unpack(mgpir_pl, NULL, NULL, NULL,
+			       &mlxsw_env->line_cards[slot_index]->module_count,
+			       NULL);
+
+	err = mlxsw_env_module_event_enable(mlxsw_env, slot_index);
+	if (err) {
+		dev_err(mlxsw_env->bus_info->dev, "Failed to enable port module events for line card in slot %d\n",
+			slot_index);
+		goto err_mlxsw_env_module_event_enable;
+	}
+	err = mlxsw_env_module_type_set(mlxsw_env->core, slot_index);
+	if (err) {
+		dev_err(mlxsw_env->bus_info->dev, "Failed to set modules' type for line card in slot %d\n",
+			slot_index);
+		goto err_type_set;
+	}
+
+	mlxsw_env->line_cards[slot_index]->active = true;
+	/* Apply power mode policy. */
+	mlxsw_env_linecard_modules_power_mode_apply(mlxsw_core, mlxsw_env,
+						    slot_index);
+	mutex_unlock(&mlxsw_env->line_cards_lock);
+
+	return;
+
+err_type_set:
+	mlxsw_env_module_event_disable(mlxsw_env, slot_index);
+err_mlxsw_env_module_event_enable:
+out_unlock:
+	mutex_unlock(&mlxsw_env->line_cards_lock);
+}
+
+static void
+mlxsw_env_got_inactive(struct mlxsw_core *mlxsw_core, u8 slot_index,
+		       void *priv)
+{
+	struct mlxsw_env *mlxsw_env = priv;
+
+	mutex_lock(&mlxsw_env->line_cards_lock);
+	if (!__mlxsw_env_linecard_is_active(mlxsw_env, slot_index))
+		goto out_unlock;
+	mlxsw_env->line_cards[slot_index]->active = false;
+	mlxsw_env_module_event_disable(mlxsw_env, slot_index);
+	mlxsw_env->line_cards[slot_index]->module_count = 0;
+out_unlock:
+	mutex_unlock(&mlxsw_env->line_cards_lock);
+}
+
+static struct mlxsw_linecards_event_ops mlxsw_env_event_ops = {
+	.got_active = mlxsw_env_got_active,
+	.got_inactive = mlxsw_env_got_inactive,
+};
+
+int mlxsw_env_init(struct mlxsw_core *mlxsw_core,
+		   const struct mlxsw_bus_info *bus_info,
+		   struct mlxsw_env **p_env)
 {
 	u8 module_count, num_of_slots, max_module_count;
 	char mgpir_pl[MLXSW_REG_MGPIR_LEN];
@@ -1221,6 +1388,7 @@ int mlxsw_env_init(struct mlxsw_core *mlxsw_core, struct mlxsw_env **p_env)
 		return -ENOMEM;
 
 	env->core = mlxsw_core;
+	env->bus_info = bus_info;
 	env->num_of_slots = num_of_slots + 1;
 	env->max_module_count = max_module_count;
 	err = mlxsw_env_line_cards_alloc(env);
@@ -1230,6 +1398,11 @@ int mlxsw_env_init(struct mlxsw_core *mlxsw_core, struct mlxsw_env **p_env)
 	mutex_init(&env->line_cards_lock);
 	*p_env = env;
 
+	err = mlxsw_linecards_event_ops_register(env->core,
+						 &mlxsw_env_event_ops, env);
+	if (err)
+		goto err_linecards_event_ops_register;
+
 	err = mlxsw_env_temp_warn_event_register(mlxsw_core);
 	if (err)
 		goto err_temp_warn_event_register;
@@ -1254,6 +1427,8 @@ int mlxsw_env_init(struct mlxsw_core *mlxsw_core, struct mlxsw_env **p_env)
 	if (err)
 		goto err_type_set;
 
+	env->line_cards[0]->active = true;
+
 	return 0;
 
 err_type_set:
@@ -1263,6 +1438,9 @@ err_mlxsw_env_module_event_enable:
 err_module_plug_event_register:
 	mlxsw_env_temp_warn_event_unregister(env);
 err_temp_warn_event_register:
+	mlxsw_linecards_event_ops_unregister(env->core,
+					     &mlxsw_env_event_ops, env);
+err_linecards_event_ops_register:
 	mutex_destroy(&env->line_cards_lock);
 	mlxsw_env_line_cards_free(env);
 err_mlxsw_env_line_cards_alloc:
@@ -1272,11 +1450,14 @@ err_mlxsw_env_line_cards_alloc:
 
 void mlxsw_env_fini(struct mlxsw_env *env)
 {
+	env->line_cards[0]->active = false;
 	mlxsw_env_module_event_disable(env, 0);
 	mlxsw_env_module_plug_event_unregister(env);
 	/* Make sure there is no more event work scheduled. */
 	mlxsw_core_flush_owq();
 	mlxsw_env_temp_warn_event_unregister(env);
+	mlxsw_linecards_event_ops_unregister(env->core,
+					     &mlxsw_env_event_ops, env);
 	mutex_destroy(&env->line_cards_lock);
 	mlxsw_env_line_cards_free(env);
 	kfree(env);
diff --git a/drivers/net/ethernet/mellanox/mlxsw/core_env.h b/drivers/net/ethernet/mellanox/mlxsw/core_env.h
index 6b494c64a4d7..a197e3ae069c 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core_env.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/core_env.h
@@ -60,7 +60,9 @@ int mlxsw_env_module_port_up(struct mlxsw_core *mlxsw_core, u8 slot_index,
 void mlxsw_env_module_port_down(struct mlxsw_core *mlxsw_core, u8 slot_index,
 				u8 module);
 
-int mlxsw_env_init(struct mlxsw_core *core, struct mlxsw_env **p_env);
+int mlxsw_env_init(struct mlxsw_core *core,
+		   const struct mlxsw_bus_info *bus_info,
+		   struct mlxsw_env **p_env);
 void mlxsw_env_fini(struct mlxsw_env *env);
 
 #endif
diff --git a/drivers/net/ethernet/mellanox/mlxsw/core_hwmon.c b/drivers/net/ethernet/mellanox/mlxsw/core_hwmon.c
index fff6f248d6f7..70735068cf29 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core_hwmon.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/core_hwmon.c
@@ -19,6 +19,7 @@
 #define MLXSW_HWMON_ATTR_PER_SENSOR 3
 #define MLXSW_HWMON_ATTR_PER_MODULE 7
 #define MLXSW_HWMON_ATTR_PER_GEARBOX 4
+#define MLXSW_HWMON_DEV_NAME_LEN_MAX 16
 
 #define MLXSW_HWMON_ATTR_COUNT (MLXSW_HWMON_SENSORS_MAX_COUNT * MLXSW_HWMON_ATTR_PER_SENSOR + \
 				MLXSW_HWMON_MODULES_MAX_COUNT * MLXSW_HWMON_ATTR_PER_MODULE + \
@@ -41,6 +42,7 @@ static int mlxsw_hwmon_get_attr_index(int index, int count)
 }
 
 struct mlxsw_hwmon_dev {
+	char name[MLXSW_HWMON_DEV_NAME_LEN_MAX];
 	struct mlxsw_hwmon *hwmon;
 	struct device *hwmon_dev;
 	struct attribute_group group;
@@ -51,6 +53,7 @@ struct mlxsw_hwmon_dev {
 	u8 sensor_count;
 	u8 module_sensor_max;
 	u8 slot_index;
+	bool active;
 };
 
 struct mlxsw_hwmon {
@@ -780,6 +783,75 @@ static int mlxsw_hwmon_gearbox_init(struct mlxsw_hwmon_dev *mlxsw_hwmon_dev)
 	return 0;
 }
 
+static void
+mlxsw_hwmon_got_active(struct mlxsw_core *mlxsw_core, u8 slot_index,
+		       void *priv)
+{
+	struct mlxsw_hwmon *hwmon = priv;
+	struct mlxsw_hwmon_dev *linecard;
+	struct device *dev;
+	int err;
+
+	dev = hwmon->bus_info->dev;
+	linecard = &hwmon->line_cards[slot_index];
+	if (linecard->active)
+		return;
+	/* For the main board, module sensor indexes start from 1, sensor index
+	 * 0 is used for the ASIC. Use the same numbering for line cards.
+	 */
+	linecard->sensor_count = 1;
+	linecard->slot_index = slot_index;
+	linecard->hwmon = hwmon;
+	err = mlxsw_hwmon_module_init(linecard);
+	if (err) {
+		dev_err(dev, "Failed to configure hwmon objects for line card modules in slot %d\n",
+			slot_index);
+		return;
+	}
+
+	err = mlxsw_hwmon_gearbox_init(linecard);
+	if (err) {
+		dev_err(dev, "Failed to configure hwmon objects for line card gearboxes in slot %d\n",
+			slot_index);
+		return;
+	}
+
+	linecard->groups[0] = &linecard->group;
+	linecard->group.attrs = linecard->attrs;
+	sprintf(linecard->name, "%s#%02u", "linecard", slot_index);
+	linecard->hwmon_dev =
+		hwmon_device_register_with_groups(dev, linecard->name,
+						  linecard, linecard->groups);
+	if (IS_ERR(linecard->hwmon_dev)) {
+		dev_err(dev, "Failed to register hwmon objects for line card in slot %d\n",
+			slot_index);
+		return;
+	}
+
+	linecard->active = true;
+}
+
+static void
+mlxsw_hwmon_got_inactive(struct mlxsw_core *mlxsw_core, u8 slot_index,
+			 void *priv)
+{
+	struct mlxsw_hwmon *hwmon = priv;
+	struct mlxsw_hwmon_dev *linecard;
+
+	linecard = &hwmon->line_cards[slot_index];
+	if (!linecard->active)
+		return;
+	linecard->active = false;
+	hwmon_device_unregister(linecard->hwmon_dev);
+	/* Reset attributes counter */
+	linecard->attrs_count = 0;
+}
+
+static struct mlxsw_linecards_event_ops mlxsw_hwmon_event_ops = {
+	.got_active = mlxsw_hwmon_got_active,
+	.got_inactive = mlxsw_hwmon_got_inactive,
+};
+
 int mlxsw_hwmon_init(struct mlxsw_core *mlxsw_core,
 		     const struct mlxsw_bus_info *mlxsw_bus_info,
 		     struct mlxsw_hwmon **p_hwmon)
@@ -836,10 +908,19 @@ int mlxsw_hwmon_init(struct mlxsw_core *mlxsw_core,
 		goto err_hwmon_register;
 	}
 
+	err = mlxsw_linecards_event_ops_register(mlxsw_hwmon->core,
+						 &mlxsw_hwmon_event_ops,
+						 mlxsw_hwmon);
+	if (err)
+		goto err_linecards_event_ops_register;
+
 	mlxsw_hwmon->line_cards[0].hwmon_dev = hwmon_dev;
+	mlxsw_hwmon->line_cards[0].active = true;
 	*p_hwmon = mlxsw_hwmon;
 	return 0;
 
+err_linecards_event_ops_register:
+	hwmon_device_unregister(mlxsw_hwmon->line_cards[0].hwmon_dev);
 err_hwmon_register:
 err_temp_gearbox_init:
 err_temp_module_init:
@@ -851,6 +932,9 @@ err_temp_init:
 
 void mlxsw_hwmon_fini(struct mlxsw_hwmon *mlxsw_hwmon)
 {
+	mlxsw_hwmon->line_cards[0].active = false;
+	mlxsw_linecards_event_ops_unregister(mlxsw_hwmon->core,
+					     &mlxsw_hwmon_event_ops, mlxsw_hwmon);
 	hwmon_device_unregister(mlxsw_hwmon->line_cards[0].hwmon_dev);
 	kfree(mlxsw_hwmon);
 }
diff --git a/drivers/net/ethernet/mellanox/mlxsw/core_linecards.c b/drivers/net/ethernet/mellanox/mlxsw/core_linecards.c
index 1d50bfe67156..90e487cc2e2a 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core_linecards.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/core_linecards.c
@@ -95,6 +95,137 @@ static void mlxsw_linecard_provision_fail(struct mlxsw_linecard *linecard)
 	devlink_linecard_provision_fail(linecard->devlink_linecard);
 }
 
+struct mlxsw_linecards_event_ops_item {
+	struct list_head list;
+	const struct mlxsw_linecards_event_ops *event_ops;
+	void *priv;
+};
+
+static void
+mlxsw_linecard_event_op_call(struct mlxsw_linecard *linecard,
+			     mlxsw_linecards_event_op_t *op, void *priv)
+{
+	struct mlxsw_core *mlxsw_core = linecard->linecards->mlxsw_core;
+
+	if (!op)
+		return;
+	op(mlxsw_core, linecard->slot_index, priv);
+}
+
+static void
+mlxsw_linecard_active_ops_call(struct mlxsw_linecard *linecard)
+{
+	struct mlxsw_linecards *linecards = linecard->linecards;
+	struct mlxsw_linecards_event_ops_item *item;
+
+	mutex_lock(&linecards->event_ops_list_lock);
+	list_for_each_entry(item, &linecards->event_ops_list, list)
+		mlxsw_linecard_event_op_call(linecard,
+					     item->event_ops->got_active,
+					     item->priv);
+	mutex_unlock(&linecards->event_ops_list_lock);
+}
+
+static void
+mlxsw_linecard_inactive_ops_call(struct mlxsw_linecard *linecard)
+{
+	struct mlxsw_linecards *linecards = linecard->linecards;
+	struct mlxsw_linecards_event_ops_item *item;
+
+	mutex_lock(&linecards->event_ops_list_lock);
+	list_for_each_entry(item, &linecards->event_ops_list, list)
+		mlxsw_linecard_event_op_call(linecard,
+					     item->event_ops->got_inactive,
+					     item->priv);
+	mutex_unlock(&linecards->event_ops_list_lock);
+}
+
+static void
+mlxsw_linecards_event_ops_register_call(struct mlxsw_linecards *linecards,
+					const struct mlxsw_linecards_event_ops_item *item)
+{
+	struct mlxsw_linecard *linecard;
+	int i;
+
+	for (i = 0; i < linecards->count; i++) {
+		linecard = mlxsw_linecard_get(linecards, i + 1);
+		mutex_lock(&linecard->lock);
+		if (linecard->active)
+			mlxsw_linecard_event_op_call(linecard,
+						     item->event_ops->got_active,
+						     item->priv);
+		mutex_unlock(&linecard->lock);
+	}
+}
+
+static void
+mlxsw_linecards_event_ops_unregister_call(struct mlxsw_linecards *linecards,
+					  const struct mlxsw_linecards_event_ops_item *item)
+{
+	struct mlxsw_linecard *linecard;
+	int i;
+
+	for (i = 0; i < linecards->count; i++) {
+		linecard = mlxsw_linecard_get(linecards, i + 1);
+		mutex_lock(&linecard->lock);
+		if (linecard->active)
+			mlxsw_linecard_event_op_call(linecard,
+						     item->event_ops->got_inactive,
+						     item->priv);
+		mutex_unlock(&linecard->lock);
+	}
+}
+
+int mlxsw_linecards_event_ops_register(struct mlxsw_core *mlxsw_core,
+				       struct mlxsw_linecards_event_ops *ops,
+				       void *priv)
+{
+	struct mlxsw_linecards *linecards = mlxsw_core_linecards(mlxsw_core);
+	struct mlxsw_linecards_event_ops_item *item;
+
+	if (!linecards)
+		return 0;
+	item = kzalloc(sizeof(*item), GFP_KERNEL);
+	if (!item)
+		return -ENOMEM;
+	item->event_ops = ops;
+	item->priv = priv;
+
+	mutex_lock(&linecards->event_ops_list_lock);
+	list_add_tail(&item->list, &linecards->event_ops_list);
+	mutex_unlock(&linecards->event_ops_list_lock);
+	mlxsw_linecards_event_ops_register_call(linecards, item);
+	return 0;
+}
+EXPORT_SYMBOL(mlxsw_linecards_event_ops_register);
+
+void mlxsw_linecards_event_ops_unregister(struct mlxsw_core *mlxsw_core,
+					  struct mlxsw_linecards_event_ops *ops,
+					  void *priv)
+{
+	struct mlxsw_linecards *linecards = mlxsw_core_linecards(mlxsw_core);
+	struct mlxsw_linecards_event_ops_item *item, *tmp;
+	bool found = false;
+
+	if (!linecards)
+		return;
+	mutex_lock(&linecards->event_ops_list_lock);
+	list_for_each_entry_safe(item, tmp, &linecards->event_ops_list, list) {
+		if (item->event_ops == ops && item->priv == priv) {
+			list_del(&item->list);
+			found = true;
+			break;
+		}
+	}
+	mutex_unlock(&linecards->event_ops_list_lock);
+
+	if (!found)
+		return;
+	mlxsw_linecards_event_ops_unregister_call(linecards, item);
+	kfree(item);
+}
+EXPORT_SYMBOL(mlxsw_linecards_event_ops_unregister);
+
 static int
 mlxsw_linecard_provision_set(struct mlxsw_linecard *linecard, u8 card_type,
 			     u16 hw_revision, u16 ini_version)
@@ -163,12 +294,14 @@ static int mlxsw_linecard_ready_clear(struct mlxsw_linecard *linecard)
 
 static void mlxsw_linecard_active_set(struct mlxsw_linecard *linecard)
 {
+	mlxsw_linecard_active_ops_call(linecard);
 	linecard->active = true;
 	devlink_linecard_activate(linecard->devlink_linecard);
 }
 
 static void mlxsw_linecard_active_clear(struct mlxsw_linecard *linecard)
 {
+	mlxsw_linecard_inactive_ops_call(linecard);
 	linecard->active = false;
 	devlink_linecard_deactivate(linecard->devlink_linecard);
 }
@@ -954,6 +1087,8 @@ int mlxsw_linecards_init(struct mlxsw_core *mlxsw_core,
 	linecards->count = slot_count;
 	linecards->mlxsw_core = mlxsw_core;
 	linecards->bus_info = bus_info;
+	INIT_LIST_HEAD(&linecards->event_ops_list);
+	mutex_init(&linecards->event_ops_list_lock);
 
 	err = mlxsw_linecard_types_init(mlxsw_core, linecards);
 	if (err)
@@ -1001,5 +1136,7 @@ void mlxsw_linecards_fini(struct mlxsw_core *mlxsw_core)
 				    ARRAY_SIZE(mlxsw_linecard_listener),
 				    mlxsw_core);
 	mlxsw_linecard_types_fini(linecards);
+	mutex_destroy(&linecards->event_ops_list_lock);
+	WARN_ON(!list_empty(&linecards->event_ops_list));
 	vfree(linecards);
 }
diff --git a/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c b/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
index e8ce26a1d483..3548fe1df7c8 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
@@ -90,6 +90,7 @@ struct mlxsw_thermal_area {
 	struct mlxsw_thermal_module *tz_gearbox_arr;
 	u8 tz_gearbox_num;
 	u8 slot_index;
+	bool active;
 };
 
 struct mlxsw_thermal {
@@ -913,6 +914,64 @@ mlxsw_thermal_gearboxes_fini(struct mlxsw_thermal *thermal,
 	kfree(area->tz_gearbox_arr);
 }
 
+static void
+mlxsw_thermal_got_active(struct mlxsw_core *mlxsw_core, u8 slot_index,
+			 void *priv)
+{
+	struct mlxsw_thermal *thermal = priv;
+	struct mlxsw_thermal_area *linecard;
+	int err;
+
+	linecard = &thermal->line_cards[slot_index];
+
+	if (linecard->active)
+		return;
+
+	linecard->slot_index = slot_index;
+	err = mlxsw_thermal_modules_init(thermal->bus_info->dev, thermal->core,
+					 thermal, linecard);
+	if (err) {
+		dev_err(thermal->bus_info->dev, "Failed to configure thermal objects for line card modules in slot %d\n",
+			slot_index);
+		return;
+	}
+
+	err = mlxsw_thermal_gearboxes_init(thermal->bus_info->dev,
+					   thermal->core, thermal, linecard);
+	if (err) {
+		dev_err(thermal->bus_info->dev, "Failed to configure thermal objects for line card gearboxes in slot %d\n",
+			slot_index);
+		goto err_thermal_linecard_gearboxes_init;
+	}
+
+	linecard->active = true;
+
+	return;
+
+err_thermal_linecard_gearboxes_init:
+	mlxsw_thermal_modules_fini(thermal, linecard);
+}
+
+static void
+mlxsw_thermal_got_inactive(struct mlxsw_core *mlxsw_core, u8 slot_index,
+			   void *priv)
+{
+	struct mlxsw_thermal *thermal = priv;
+	struct mlxsw_thermal_area *linecard;
+
+	linecard = &thermal->line_cards[slot_index];
+	if (!linecard->active)
+		return;
+	linecard->active = false;
+	mlxsw_thermal_gearboxes_fini(thermal, linecard);
+	mlxsw_thermal_modules_fini(thermal, linecard);
+}
+
+static struct mlxsw_linecards_event_ops mlxsw_thermal_event_ops = {
+	.got_active = mlxsw_thermal_got_active,
+	.got_inactive = mlxsw_thermal_got_inactive,
+};
+
 int mlxsw_thermal_init(struct mlxsw_core *core,
 		       const struct mlxsw_bus_info *bus_info,
 		       struct mlxsw_thermal **p_thermal)
@@ -1018,14 +1077,25 @@ int mlxsw_thermal_init(struct mlxsw_core *core,
 	if (err)
 		goto err_thermal_gearboxes_init;
 
+	err = mlxsw_linecards_event_ops_register(core,
+						 &mlxsw_thermal_event_ops,
+						 thermal);
+	if (err)
+		goto err_linecards_event_ops_register;
+
 	err = thermal_zone_device_enable(thermal->tzdev);
 	if (err)
 		goto err_thermal_zone_device_enable;
 
+	thermal->line_cards[0].active = true;
 	*p_thermal = thermal;
 	return 0;
 
 err_thermal_zone_device_enable:
+	mlxsw_linecards_event_ops_unregister(thermal->core,
+					     &mlxsw_thermal_event_ops,
+					     thermal);
+err_linecards_event_ops_register:
 	mlxsw_thermal_gearboxes_fini(thermal, &thermal->line_cards[0]);
 err_thermal_gearboxes_init:
 	mlxsw_thermal_modules_fini(thermal, &thermal->line_cards[0]);
@@ -1049,6 +1119,10 @@ void mlxsw_thermal_fini(struct mlxsw_thermal *thermal)
 {
 	int i;
 
+	thermal->line_cards[0].active = false;
+	mlxsw_linecards_event_ops_unregister(thermal->core,
+					     &mlxsw_thermal_event_ops,
+					     thermal);
 	mlxsw_thermal_gearboxes_fini(thermal, &thermal->line_cards[0]);
 	mlxsw_thermal_modules_fini(thermal, &thermal->line_cards[0]);
 	if (thermal->tzdev) {