linux-kernel - [PATCH v2 0/5] Refactoring finding CPU phandles in DT

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Message-ID: <20250708151502.561-1-alireza.sanaee@huawei.com>
Date: Tue, 8 Jul 2025 16:14:57 +0100
From: Alireza Sanaee <alireza.sanaee@...wei.com>
To: <krzk@...nel.org>, <robh@...nel.org>
CC: <coresight@...ts.linaro.org>, <devicetree@...r.kernel.org>,
	<dianders@...omium.org>, <james.clark@...aro.org>,
	<jonathan.cameron@...wei.com>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <linux-perf-users@...r.kernel.org>,
	<linuxarm@...wei.com>, <mark.rutland@....com>, <mike.leach@...aro.org>,
	<ruanjinjie@...wei.com>, <saravanak@...gle.com>,
	<shameerali.kolothum.thodi@...wei.com>
Subject: [PATCH v2 0/5] Refactoring finding CPU phandles in DT

This series refactors the way CPU IDs are retrieved from the device
tree.

Usually, there is a for loop that goes over every single CPU that can be
avoided. This also reduces the amount of NULL pointer checks in drivers.
I have abstracted away that loop and introduced a new function
(of_cpu_node_to_id) for this.

This patchset is a subset of [1], where I removed content and patches
relevant to hyper-threaded cores for DT. Based on the discussion, the
code refactor is still useful, hence this patchset.

Changes since v1 [2]:
    - Rebased on top of the latest mainline.
    - Addressed Krzysztof Kozlowski's comments -- Hopefully :-)
    - Addressed Jonathan Cameron's comments.

[1] https://lore.kernel.org/all/20250512080715.82-1-alireza.sanaee@huawei.com/
[2] https://lore.kernel.org/all/20250707150414.620-1-alireza.sanaee@huawei.com/

Alireza Sanaee (5):
  of: add infra for finding CPU id from phandle
  arch_topology: update CPU map to use the new API
  coresight: cti: Use of_cpu_phandle_to_id for grabbing CPU id
  coresight: Use of_cpu_phandle_to_id for grabbing CPU id
  perf/arm-dsu: refactor cpu id retrieval via new API
    of_cpu_phandle_to_id

 drivers/base/arch_topology.c                  | 16 ++++----
 .../coresight/coresight-cti-platform.c        | 14 +------
 .../hwtracing/coresight/coresight-platform.c  | 15 +------
 drivers/of/cpu.c                              | 40 +++++++++++++++++++
 drivers/perf/arm_dsu_pmu.c                    |  8 +---
 include/linux/of.h                            |  9 +++++
 6 files changed, 61 insertions(+), 41 deletions(-)

-- 
2.43.0