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authorVadim Pasternak <vadimp@nvidia.com>2021-04-06 15:27:33 +0300
committerDavid S. Miller <davem@davemloft.net>2021-04-08 00:26:18 +0300
commitd567fd6e82faa61756810b9b0dfd9d0da11e960e (patch)
treeea1fc0c90409874fd9bd7bd71a2dc10e78a507c0
parent017d6250ad719d3ddab9070446db1e9fd4ba4a65 (diff)
downloadlinux-d567fd6e82faa61756810b9b0dfd9d0da11e960e.tar.xz
mlxsw: core: Remove critical trip points from thermal zones
Disable software thermal protection by removing critical trip points from all thermal zones. The software thermal protection is redundant given there are two layers of protection below it in firmware and hardware. The first layer is performed by firmware, the second, in case firmware was not able to perform protection, by hardware. The temperature threshold set for hardware protection is always higher than for firmware. 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>
-rw-r--r--drivers/net/ethernet/mellanox/mlxsw/core_thermal.c27
1 files changed, 6 insertions, 21 deletions
diff --git a/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c b/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
index bf85ce9835d7..37fb2e1fb278 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
@@ -19,7 +19,6 @@
#define MLXSW_THERMAL_ASIC_TEMP_NORM 75000 /* 75C */
#define MLXSW_THERMAL_ASIC_TEMP_HIGH 85000 /* 85C */
#define MLXSW_THERMAL_ASIC_TEMP_HOT 105000 /* 105C */
-#define MLXSW_THERMAL_ASIC_TEMP_CRIT 140000 /* 140C */
#define MLXSW_THERMAL_HYSTERESIS_TEMP 5000 /* 5C */
#define MLXSW_THERMAL_MODULE_TEMP_SHIFT (MLXSW_THERMAL_HYSTERESIS_TEMP * 2)
#define MLXSW_THERMAL_ZONE_MAX_NAME 16
@@ -45,7 +44,6 @@ enum mlxsw_thermal_trips {
MLXSW_THERMAL_TEMP_TRIP_NORM,
MLXSW_THERMAL_TEMP_TRIP_HIGH,
MLXSW_THERMAL_TEMP_TRIP_HOT,
- MLXSW_THERMAL_TEMP_TRIP_CRIT,
};
struct mlxsw_thermal_trip {
@@ -75,16 +73,9 @@ static const struct mlxsw_thermal_trip default_thermal_trips[] = {
{ /* Warning */
.type = THERMAL_TRIP_HOT,
.temp = MLXSW_THERMAL_ASIC_TEMP_HOT,
- .hyst = MLXSW_THERMAL_HYSTERESIS_TEMP,
.min_state = MLXSW_THERMAL_MAX_STATE,
.max_state = MLXSW_THERMAL_MAX_STATE,
},
- { /* Critical - soft poweroff */
- .type = THERMAL_TRIP_CRITICAL,
- .temp = MLXSW_THERMAL_ASIC_TEMP_CRIT,
- .min_state = MLXSW_THERMAL_MAX_STATE,
- .max_state = MLXSW_THERMAL_MAX_STATE,
- }
};
#define MLXSW_THERMAL_NUM_TRIPS ARRAY_SIZE(default_thermal_trips)
@@ -154,7 +145,6 @@ mlxsw_thermal_module_trips_reset(struct mlxsw_thermal_module *tz)
tz->trips[MLXSW_THERMAL_TEMP_TRIP_NORM].temp = 0;
tz->trips[MLXSW_THERMAL_TEMP_TRIP_HIGH].temp = 0;
tz->trips[MLXSW_THERMAL_TEMP_TRIP_HOT].temp = 0;
- tz->trips[MLXSW_THERMAL_TEMP_TRIP_CRIT].temp = 0;
}
static int
@@ -183,11 +173,10 @@ mlxsw_thermal_module_trips_update(struct device *dev, struct mlxsw_core *core,
}
/* According to the system thermal requirements, the thermal zones are
- * defined with four trip points. The critical and emergency
+ * defined with three trip points. The critical and emergency
* temperature thresholds, provided by QSFP module are set as "active"
- * and "hot" trip points, "normal" and "critical" trip points are
- * derived from "active" and "hot" by subtracting or adding double
- * hysteresis value.
+ * and "hot" trip points, "normal" trip point is derived from "active"
+ * by subtracting double hysteresis value.
*/
if (crit_temp >= MLXSW_THERMAL_MODULE_TEMP_SHIFT)
tz->trips[MLXSW_THERMAL_TEMP_TRIP_NORM].temp = crit_temp -
@@ -196,8 +185,6 @@ mlxsw_thermal_module_trips_update(struct device *dev, struct mlxsw_core *core,
tz->trips[MLXSW_THERMAL_TEMP_TRIP_NORM].temp = crit_temp;
tz->trips[MLXSW_THERMAL_TEMP_TRIP_HIGH].temp = crit_temp;
tz->trips[MLXSW_THERMAL_TEMP_TRIP_HOT].temp = emerg_temp;
- tz->trips[MLXSW_THERMAL_TEMP_TRIP_CRIT].temp = emerg_temp +
- MLXSW_THERMAL_MODULE_TEMP_SHIFT;
return 0;
}
@@ -210,7 +197,7 @@ static void mlxsw_thermal_tz_score_update(struct mlxsw_thermal *thermal,
struct mlxsw_thermal_trip *trip = trips;
unsigned int score, delta, i, shift = 1;
- /* Calculate thermal zone score, if temperature is above the critical
+ /* Calculate thermal zone score, if temperature is above the hot
* threshold score is set to MLXSW_THERMAL_TEMP_SCORE_MAX.
*/
score = MLXSW_THERMAL_TEMP_SCORE_MAX;
@@ -333,8 +320,7 @@ static int mlxsw_thermal_set_trip_temp(struct thermal_zone_device *tzdev,
{
struct mlxsw_thermal *thermal = tzdev->devdata;
- if (trip < 0 || trip >= MLXSW_THERMAL_NUM_TRIPS ||
- temp > MLXSW_THERMAL_ASIC_TEMP_CRIT)
+ if (trip < 0 || trip >= MLXSW_THERMAL_NUM_TRIPS)
return -EINVAL;
thermal->trips[trip].temp = temp;
@@ -502,8 +488,7 @@ mlxsw_thermal_module_trip_temp_set(struct thermal_zone_device *tzdev,
{
struct mlxsw_thermal_module *tz = tzdev->devdata;
- if (trip < 0 || trip >= MLXSW_THERMAL_NUM_TRIPS ||
- temp > tz->trips[MLXSW_THERMAL_TEMP_TRIP_CRIT].temp)
+ if (trip < 0 || trip >= MLXSW_THERMAL_NUM_TRIPS)
return -EINVAL;
tz->trips[trip].temp = temp;