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perf: Allow a PMU to have a parent

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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: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/20230526095824.16336-2-Jonathan.Cameron@huawei.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Jonathan Cameron 2023-05-26 10:58:20 +01:00 committed by Dan Williams
parent 7877cb91f1
commit 143f83e200
2 changed files with 2 additions and 0 deletions
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1
include/linux/perf_event.h
View File

@ -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;

1
kernel/events/core.c
View File

@ -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);