linux-kernel - [PATCH v2 28/28] coresight: Manage activated path during CPU hotplug

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Message-Id: <20250701-arm_cs_pm_fix_v3-v2-28-23ebb864fcc1@arm.com>
Date: Tue, 01 Jul 2025 15:53:53 +0100
From: Leo Yan <leo.yan@....com>
To: Suzuki K Poulose <suzuki.poulose@....com>, 
 Mike Leach <mike.leach@...aro.org>, James Clark <james.clark@...aro.org>, 
 Levi Yun <yeoreum.yun@....com>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>, 
 Yabin Cui <yabinc@...gle.com>, Keita Morisaki <keyz@...gle.com>, 
 Yuanfang Zhang <quic_yuanfang@...cinc.com>
Cc: coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org, 
 linux-kernel@...r.kernel.org, Leo Yan <leo.yan@....com>
Subject: [PATCH v2 28/28] coresight: Manage activated path during CPU
 hotplug

This commit handles activated path during the CPU hotplug process.

When a CPU is hotplug off or hotplug in, and if an activated path is
associated with it, the CPU PM notifier disables and enables the path,
including the sink and helpers.

When disabling a path, the sink's disable() callback updates its buffer
in SysFS mode.

Signed-off-by: Leo Yan <leo.yan@....com>
---
 drivers/hwtracing/coresight/coresight-core.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c
index e1659b05738e73fcb6c66c74c8f1ce3a24ab2da4..0f77f4c5464550a28e2dce391e92160a7003c140 100644
--- a/drivers/hwtracing/coresight/coresight-core.c
+++ b/drivers/hwtracing/coresight/coresight-core.c
@@ -1717,6 +1717,7 @@ static int coresight_starting_cpu(unsigned int cpu)
 	if (path->saved_mode != CS_MODE_SYSFS)
 		return 0;
 
+	_coresight_enable_path(path, path->saved_mode, NULL, false);
 	source_ops(source)->enable(source, NULL, path->saved_mode, path);
 	return 0;
 }
@@ -1743,7 +1744,8 @@ static int coresight_dying_cpu(unsigned int cpu)
 	if (WARN_ON(path->saved_mode != CS_MODE_SYSFS))
 		return 0;
 
-	source_ops(source)->disable(source, NULL);
+	coresight_disable_source(source, NULL);
+	coresight_disable_path_from(path, NULL, false);
 	return 0;
 }
 

-- 
2.34.1