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fpga: dfl: fme: add thermal management support

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This patch adds support to thermal management private feature for DFL
FPGA Management Engine (FME). This private feature driver registers
a hwmon for thermal/temperature monitoring (hwmon temp1_input).
If hardware automatic throttling is supported by this hardware, then
driver also exposes sysfs interfaces under hwmon for thresholds
(temp1_max/ crit/ emergency), threshold alarms (temp1_max_alarm/
temp1_crit_alarm) and throttling policy (temp1_max_policy).

Signed-off-by: Luwei Kang <luwei.kang@intel.com>
Signed-off-by: Russ Weight <russell.h.weight@intel.com>
Signed-off-by: Xu Yilun <yilun.xu@intel.com>
Signed-off-by: Wu Hao <hao.wu@intel.com>
Acked-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Moritz Fischer <mdf@kernel.org>
Signed-off-by: Moritz Fischer <mdf@kernel.org>
This commit is contained in:
Wu Hao
2019-10-14 13:42:02 +08:00
committed by Moritz Fischer
parent 214be7470e
commit 4284c65a9f
3 changed files with 243 additions and 1 deletions
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64
Documentation/ABI/testing/sysfs-platform-dfl-fme
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@@ -106,3 +106,67 @@ KernelVersion: 5.4
Contact: Wu Hao <hao.wu@intel.com>
Description: Read-only. Read this file to get the second error detected by
hardware.
What: /sys/bus/platform/devices/dfl-fme.0/hwmon/hwmonX/name
Date: October 2019
KernelVersion: 5.5
Contact: Wu Hao <hao.wu@intel.com>
Description: Read-Only. Read this file to get the name of hwmon device, it
supports values:
'dfl_fme_thermal' - thermal hwmon device name
What: /sys/bus/platform/devices/dfl-fme.0/hwmon/hwmonX/temp1_input
Date: October 2019
KernelVersion: 5.5
Contact: Wu Hao <hao.wu@intel.com>
Description: Read-Only. It returns FPGA device temperature in millidegrees
Celsius.
What: /sys/bus/platform/devices/dfl-fme.0/hwmon/hwmonX/temp1_max
Date: October 2019
KernelVersion: 5.5
Contact: Wu Hao <hao.wu@intel.com>
Description: Read-Only. It returns hardware threshold1 temperature in
millidegrees Celsius. If temperature rises at or above this
threshold, hardware starts 50% or 90% throttling (see
'temp1_max_policy').
What: /sys/bus/platform/devices/dfl-fme.0/hwmon/hwmonX/temp1_crit
Date: October 2019
KernelVersion: 5.5
Contact: Wu Hao <hao.wu@intel.com>
Description: Read-Only. It returns hardware threshold2 temperature in
millidegrees Celsius. If temperature rises at or above this
threshold, hardware starts 100% throttling.
What: /sys/bus/platform/devices/dfl-fme.0/hwmon/hwmonX/temp1_emergency
Date: October 2019
KernelVersion: 5.5
Contact: Wu Hao <hao.wu@intel.com>
Description: Read-Only. It returns hardware trip threshold temperature in
millidegrees Celsius. If temperature rises at or above this
threshold, a fatal event will be triggered to board management
controller (BMC) to shutdown FPGA.
What: /sys/bus/platform/devices/dfl-fme.0/hwmon/hwmonX/temp1_max_alarm
Date: October 2019
KernelVersion: 5.5
Contact: Wu Hao <hao.wu@intel.com>
Description: Read-only. It returns 1 if temperature is currently at or above
hardware threshold1 (see 'temp1_max'), otherwise 0.
What: /sys/bus/platform/devices/dfl-fme.0/hwmon/hwmonX/temp1_crit_alarm
Date: October 2019
KernelVersion: 5.5
Contact: Wu Hao <hao.wu@intel.com>
Description: Read-only. It returns 1 if temperature is currently at or above
hardware threshold2 (see 'temp1_crit'), otherwise 0.
What: /sys/bus/platform/devices/dfl-fme.0/hwmon/hwmonX/temp1_max_policy
Date: October 2019
KernelVersion: 5.5
Contact: Wu Hao <hao.wu@intel.com>
Description: Read-Only. Read this file to get the policy of hardware threshold1
(see 'temp1_max'). It only supports two values (policies):
0 - AP2 state (90% throttling)
1 - AP1 state (50% throttling)