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Merge branch master from git://git.kernel.org/pub/scm/linux/kernel/gi…
…t/torvalds/linux.git Pick up the spectre documentation so the Grand Schemozzle can be added.
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Original file line number | Diff line number | Diff line change |
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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". |
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