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Message-ID: <20230327170247.6968-3-Jonathan.Cameron@huawei.com>
Date: Mon, 27 Mar 2023 18:02:44 +0100
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: Liang Kan <kan.liang@...ux.intel.com>, <linux-cxl@...r.kernel.org>,
<peterz@...radead.org>
CC: <mingo@...hat.com>, <acme@...nel.org>, <mark.rutland@....com>,
<will@...nel.org>, <dan.j.williams@...el.com>,
<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>
Subject: [PATCH v3 2/5] 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.
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
---
v3: No change
---
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 fb3e436bcd4a..a84c282221f2 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -11367,6 +11367,7 @@ 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);
--
2.37.2
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