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firmware: arm_scmi: Add debugfs ABI documentation for common entries 

Add description of the debugfs SCMI common ABI.

Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Tested-by: Florian Fainelli <f.fainelli@gmail.com>
Tested-by: Vincent Guittot <vincent.guittot@linaro.org>
Link: https://lore.kernel.org/r/20230118121426.492864-12-cristian.marussi@arm.com
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Cristian Marussi 2023-01-18 12:14:20 +00:00 committed by Sudeep Holla
parent c3d4aed763
commit 0f62ed0092
1 changed files with 70 additions and 0 deletions
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What: /sys/kernel/debug/scmi/<n>/instance_name
Date: March 2023
KernelVersion: 6.3
Contact: cristian.marussi@arm.com
Description: The name of the underlying SCMI instance <n> described by
all the debugfs accessors rooted at /sys/kernel/debug/scmi/<n>,
expressed as the full name of the top DT SCMI node under which
this SCMI instance is rooted.
Users: Debugging, any userspace test suite
What: /sys/kernel/debug/scmi/<n>/atomic_threshold_us
Date: March 2023
KernelVersion: 6.3
Contact: cristian.marussi@arm.com
Description: An optional time value, expressed in microseconds, representing,
on this SCMI instance <n>, the threshold above which any SCMI
command, advertised to have an higher-than-threshold execution
latency, should not be considered for atomic mode of operation,
even if requested.
Users: Debugging, any userspace test suite
What: /sys/kernel/debug/scmi/<n>/transport/type
Date: March 2023
KernelVersion: 6.3
Contact: cristian.marussi@arm.com
Description: A string representing the type of transport configured for this
SCMI instance <n>.
Users: Debugging, any userspace test suite
What: /sys/kernel/debug/scmi/<n>/transport/is_atomic
Date: March 2023
KernelVersion: 6.3
Contact: cristian.marussi@arm.com
Description: A boolean stating if the transport configured on the underlying
SCMI instance <n> is capable of atomic mode of operation.
Users: Debugging, any userspace test suite
What: /sys/kernel/debug/scmi/<n>/transport/max_rx_timeout_ms
Date: March 2023
KernelVersion: 6.3
Contact: cristian.marussi@arm.com
Description: Timeout in milliseconds allowed for SCMI synchronous replies
for the currently configured SCMI transport for instance <n>.
Users: Debugging, any userspace test suite
What: /sys/kernel/debug/scmi/<n>/transport/max_msg_size
Date: March 2023
KernelVersion: 6.3
Contact: cristian.marussi@arm.com
Description: Max message size of allowed SCMI messages for the currently
configured SCMI transport for instance <n>.
Users: Debugging, any userspace test suite
What: /sys/kernel/debug/scmi/<n>/transport/tx_max_msg
Date: March 2023
KernelVersion: 6.3
Contact: cristian.marussi@arm.com
Description: Max number of concurrently allowed in-flight SCMI messages for
the currently configured SCMI transport for instance <n> on the
TX channels.
Users: Debugging, any userspace test suite
What: /sys/kernel/debug/scmi/<n>/transport/rx_max_msg
Date: March 2023
KernelVersion: 6.3
Contact: cristian.marussi@arm.com
Description: Max number of concurrently allowed in-flight SCMI messages for
the currently configured SCMI transport for instance <n> on the
RX channels.
Users: Debugging, any userspace test suite