linux-kernel - [PATCH v7 1/5] perf: Allow a PMU to have a parent

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Message-ID: <20230526095824.16336-2-Jonathan.Cameron@huawei.com>
Date:   Fri, 26 May 2023 10:58:20 +0100
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     Liang Kan <kan.liang@...ux.intel.com>, <linux-cxl@...r.kernel.org>,
        <peterz@...radead.org>, <mark.rutland@....com>, <will@...nel.org>,
        <dan.j.williams@...el.com>
CC:     <mingo@...hat.com>, <acme@...nel.org>, <linuxarm@...wei.com>,
        <linux-perf-users@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Davidlohr Bueso <dave@...olabs.net>,
        Dave Jiang <dave.jiang@...el.com>,
        Namhyung Kim <namhyung@...il.com>,
        Stephane Eranian <eranian@...gle.com>
Subject: [PATCH v7 1/5] 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: Dan Williams <dan.j.williams@...el.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
---
 include/linux/perf_event.h | 1 +
 kernel/events/core.c       | 1 +
 2 files changed, 2 insertions(+)

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index d5628a7b5eaa..b99db1eda72c 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -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;
diff --git a/kernel/events/core.c b/kernel/events/core.c
index db016e418931..285cf6ca6e81 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -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);
-- 
2.39.2