linux-kernel - [PATCH 0/4] firmware: arm_scmi: Add xfer inflight debug and trace

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Message-Id: <20250619122004.3705976-1-philip.radford@arm.com>
Date: Thu, 19 Jun 2025 12:20:00 +0000
From: Philip Radford <philip.radford@....com>
To: linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	arm-scmi@...r.kernel.org
Cc: sudeep.holla@....com,
	cristian.marussi@....com,
	luke.parkin@....com,
	philip.radford@....com
Subject: [PATCH 0/4] firmware: arm_scmi: Add xfer inflight debug and trace

Hi all,

This series adds a new counter to the Arm SCMI firmware driver to track
the number of in-flight message transfers during debug and trace. This
will be useful for examining behaviour under a large load with regards
to concurrent messages being sent and received. As the counter only gives
a live value, printing the value in trace allows logging of the in-flight
xfers.

The series is divided into four small patches:
Patch [1/4]
	- Adds a fuction to decrement debug counters, similar to the existing
	  counter to increment debug counters
Patch [2/4]
	- Adds a new xfers_inflight debug counter to track active transfers
Patch [3/4]
	- Enhances two tracepoints (scmi_xfer_begin and scmi_xfer_end) to
	  include the number of in-flight transfers, setting default values
	  of 0
Patch [4/4]
	- Adds a function (scmi_inflight_count) that retrieves the current
	  in-flight count for use in tracing

Based on v6.16-rc2

Regards,
Phil

Philip Radford (4):
  firmware: arm_scmi: Add debug decrement counter
  firmware: arm_scmi: Add xfer_inflight counter
  include: trace: Add inflight_xfer counter tracepoint
  firmware: arm_scmi: Add new inflight tracing functionality

 drivers/firmware/arm_scmi/common.h   |  8 ++++++++
 drivers/firmware/arm_scmi/driver.c   | 28 ++++++++++++++++++++++++++--
 drivers/firmware/arm_scmi/raw_mode.c |  6 ++++--
 include/trace/events/scmi.h          | 24 ++++++++++++++----------
 4 files changed, 52 insertions(+), 14 deletions(-)

--
2.25.1