mlxsw: core_thermal: Add interfaces for line card initialization and de-initialization

Add callback functions for line card thermal area initialization and
de-initialization. Each line card is associated with the relevant
thermal area, which may contain thermal zones for cages and gearboxes
found on this line card.

The line card thermal initialization / de-initialization APIs are to be
called when line card is set to active / inactive state by
got_active() / got_inactive() callbacks from line card state machine.

For example thermal zone for module #9 located at line card #7 will
have type:
mlxsw-lc7-module9.
And thermal zone for gearbox #2 located at line card #5 will have type:
mlxsw-lc5-gearbox2.

Signed-off-by: Vadim Pasternak <vadimp@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c b/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
index e8ce26a..3548fe1 100644 (file)
--- 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) {