linux-kernel - [PATCH] perf/arm-cmn: Set PMU device parent

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Date: Tue,  9 Apr 2024 18:15:17 +0100
From: Robin Murphy <robin.murphy@....com>
To: will@...nel.org,
	mark.rutland@....com
Cc: linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] perf/arm-cmn: Set PMU device parent

Now that perf supports giving the PMU device a parent, we can use our
platform device to make the relationship between CMN instances and PMU
IDs trivially discoverable, from either nominal direction:

root@...zy-taxi:~# ls /sys/devices/platform/ARMHC600:00 | grep cmn
arm_cmn_0
root@...zy-taxi:~# realpath /sys/bus/event_source/devices/arm_cmn_0/..
/sys/devices/platform/ARMHC600:00

Signed-off-by: Robin Murphy <robin.murphy@....com>
---
 drivers/perf/arm-cmn.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/perf/arm-cmn.c b/drivers/perf/arm-cmn.c
index 7ef9c7e4836b..b2c607cf3ad7 100644
--- a/drivers/perf/arm-cmn.c
+++ b/drivers/perf/arm-cmn.c
@@ -2482,6 +2482,7 @@ static int arm_cmn_probe(struct platform_device *pdev)
 	cmn->cpu = cpumask_local_spread(0, dev_to_node(cmn->dev));
 	cmn->pmu = (struct pmu) {
 		.module = THIS_MODULE,
+		.parent = cmn->dev,
 		.attr_groups = arm_cmn_attr_groups,
 		.capabilities = PERF_PMU_CAP_NO_EXCLUDE,
 		.task_ctx_nr = perf_invalid_context,
-- 
2.39.2.101.g768bb238c484.dirty