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perf/arm-cmn: Set PMU device parent

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

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/25d4428df1ddad966c74a3ed60171cd3ca6c8b66.1712682917.git.robin.murphy@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Robin Murphy 2024-04-09 18:15:17 +01:00 committed by Will Deacon
parent 595275ca49
commit 8f9f5041c6
1 changed files with 1 additions and 0 deletions
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drivers/perf/arm-cmn.c
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@ -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,