Commit 143f83e2 authored by Jonathan Cameron's avatar Jonathan Cameron Committed by Dan Williams
Browse files

perf: Allow a PMU to have a parent 



Some PMUs have well defined parents such as PCI devices.
As the device_initialize() and device_add() are all within
pmu_dev_alloc() which is called from perf_pmu_register()
there is no opportunity to set the parent from within a driver.

Add a struct device *parent field to struct pmu and use that
to set the parent.

Reviewed-by: default avatarDan Williams <dan.j.williams@intel.com>
Reviewed-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/20230526095824.16336-2-Jonathan.Cameron@huawei.com


Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
parent 7877cb91

include/linux/perf_event.h

+1 −0
Original line number Diff line number Diff line
@@ -303,6 +303,7 @@ struct pmu { 


	struct module			*module;

	struct device			*dev;

	struct device			*parent;

	const struct attribute_group	**attr_groups;

	const struct attribute_group	**attr_update;

	const char			*name;

kernel/events/core.c

+1 −0
Original line number Diff line number Diff line
@@ -11379,6 +11379,7 @@ static int pmu_dev_alloc(struct pmu *pmu) 


	dev_set_drvdata(pmu->dev, pmu);

	pmu->dev->bus = &pmu_bus;

	pmu->dev->parent = pmu->parent;

	pmu->dev->release = pmu_dev_release;



	ret = dev_set_name(pmu->dev, "%s", pmu->name);