mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-25 04:41:15 +07:00
8c3166e17c
For ECs that support it, the EC returns the number of slp_s0 transitions and whether or not there was a timeout in the resume response. Expose the last resume result to usermode via debugfs so that usermode can detect and report S0ix timeouts. Signed-off-by: Evan Green <evgreen@chromium.org> Acked-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
57 lines
2.1 KiB
Plaintext
57 lines
2.1 KiB
Plaintext
What: /sys/kernel/debug/<cros-ec-device>/console_log
|
|
Date: September 2017
|
|
KernelVersion: 4.13
|
|
Description:
|
|
If the EC supports the CONSOLE_READ command type, this file
|
|
can be used to grab the EC logs. The kernel polls for the log
|
|
and keeps its own buffer but userspace should grab this and
|
|
write it out to some logs.
|
|
|
|
What: /sys/kernel/debug/<cros-ec-device>/panicinfo
|
|
Date: September 2017
|
|
KernelVersion: 4.13
|
|
Description:
|
|
This file dumps the EC panic information from the previous
|
|
reboot. This file will only exist if the PANIC_INFO command
|
|
type is supported by the EC.
|
|
|
|
What: /sys/kernel/debug/<cros-ec-device>/pdinfo
|
|
Date: June 2018
|
|
KernelVersion: 4.17
|
|
Description:
|
|
This file provides the port role, muxes and power debug
|
|
information for all the USB PD/type-C ports available. If
|
|
the are no ports available, this file will be just an empty
|
|
file.
|
|
|
|
What: /sys/kernel/debug/<cros-ec-device>/uptime
|
|
Date: June 2019
|
|
KernelVersion: 5.3
|
|
Description:
|
|
A u32 providing the time since EC booted in ms. This is
|
|
is used for synchronizing the AP host time with the EC
|
|
log. An error is returned if the command is not supported
|
|
by the EC or there is a communication problem.
|
|
|
|
What: /sys/kernel/debug/<cros-ec-device>/last_resume_result
|
|
Date: June 2019
|
|
KernelVersion: 5.3
|
|
Description:
|
|
Some ECs have a feature where they will track transitions to
|
|
the (Intel) processor's SLP_S0 line, in order to detect cases
|
|
where a system failed to go into S0ix. When the system resumes,
|
|
an EC with this feature will return a summary of SLP_S0
|
|
transitions that occurred. The last_resume_result file returns
|
|
the most recent response from the AP's resume message to the EC.
|
|
|
|
The bottom 31 bits contain a count of the number of SLP_S0
|
|
transitions that occurred since the suspend message was
|
|
received. Bit 31 is set if the EC attempted to wake the
|
|
system due to a timeout when watching for SLP_S0 transitions.
|
|
Callers can use this to detect a wake from the EC due to
|
|
S0ix timeouts. The result will be zero if no suspend
|
|
transitions have been attempted, or the EC does not support
|
|
this feature.
|
|
|
|
Output will be in the format: "0x%08x\n".
|