Commit 3b051bb7 authored by Yicong Yang's avatar Yicong Yang Committed by Will Deacon
Browse files

drivers/perf: hisi: Export associated CPUs of each PMU through sysfs 



Although the event of the uncore PMU can only be opened on a single
CPU, some PMU does have the affinity on a range of CPUs. For example
the L3C PMU is associated to the CPUs sharing the L3T it monitors.
Users may infer this affinity by the PMU name which may have SCCL ID
and CCL ID encoded (for L3C etc), but it's not that straightforward.
So export this information by adding an "associated_cpus" sysfs
attribute then user can get this directly.

Reviewed-by: default avatarJonathan Cameron <Joanthan.Cameron@huawei.com>
Signed-off-by: default avatarYicong Yang <yangyicong@hisilicon.com>
Link: https://lore.kernel.org/r/20241210141525.37788-9-yangyicong@huawei.com


Signed-off-by: default avatarWill Deacon <will@kernel.org>
parent 8688c01e

Documentation/admin-guide/perf/hisi-pmu.rst

+4 −1
Original line number Diff line number Diff line
@@ -35,7 +35,10 @@ e.g. hisi_sccl1_hha0/rx_operations is RX_OPERATIONS event of HHA index #0 in 
SCCL ID #1.



The driver also provides a "cpumask" sysfs attribute, which shows the CPU core

ID used to count the uncore PMU event.

ID used to count the uncore PMU event. An "associated_cpus" sysfs attribute is

also provided to show the CPUs associated with this PMU. The "cpumask" indicates

the CPUs to open the events, usually as a hint for userspaces tools like perf.

It only contains one associated CPU from the "associated_cpus".



Example usage of perf::

drivers/perf/hisilicon/hisi_uncore_pmu.c

+10 −0
Original line number Diff line number Diff line
@@ -51,8 +51,18 @@ EXPORT_SYMBOL_NS_GPL(hisi_cpumask_sysfs_show, "HISI_PMU"); 


static DEVICE_ATTR(cpumask, 0444, hisi_cpumask_sysfs_show, NULL);



static ssize_t hisi_associated_cpus_sysfs_show(struct device *dev,

				struct device_attribute *attr, char *buf)

{

	struct hisi_pmu *hisi_pmu = to_hisi_pmu(dev_get_drvdata(dev));



	return cpumap_print_to_pagebuf(true, buf, &hisi_pmu->associated_cpus);

}

static DEVICE_ATTR(associated_cpus, 0444, hisi_associated_cpus_sysfs_show, NULL);



static struct attribute *hisi_pmu_cpumask_attrs[] = {

	&dev_attr_cpumask.attr,

	&dev_attr_associated_cpus.attr,

	NULL

};