Commit 177a4b03 authored by Yicong Yang's avatar Yicong Yang Committed by zhangyuyang
Browse files

drivers/perf: hisi_pcie: Export supported Root Ports [bdf_min, bdf_max] 

maillist inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/IAQG4N
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git/commit/?id=d1c93d5c67ebc7cf5b70ecff7172a0c399975d55



----------------------------------------------------------------------

Currently users can get the Root Ports supported by the PCIe PMU by
"bus" sysfs attributes which indicates the PCIe bus number where
Root Ports are located. This maybe insufficient since Root Ports
supported by different PCIe PMUs may be located on the same PCIe bus.
So export the BDF range the Root Ports additionally.

Signed-off-by: default avatarYicong Yang <yangyicong@hisilicon.com>
Acked-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/20240829090332.28756-4-yangyicong@huawei.com


Signed-off-by: default avatarWill Deacon <will@kernel.org>
Signed-off-by: default avatarzhangyuyang <zhangyuyang31@huawei.com>
parent 4b96c5d7

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

+3 −1
Original line number Diff line number Diff line
@@ -28,7 +28,9 @@ The "identifier" sysfs file allows users to identify the version of the 
PMU hardware device.



The "bus" sysfs file allows users to get the bus number of Root Ports

monitored by PMU.

monitored by PMU. Furthermore users can get the Root Ports range in

[bdf_min, bdf_max] from "bdf_min" and "bdf_max" sysfs attributes

respectively.



Example usage of perf::

drivers/perf/hisilicon/hisi_pcie_pmu.c

+18 −0
Original line number Diff line number Diff line
@@ -152,6 +152,22 @@ static ssize_t bus_show(struct device *dev, struct device_attribute *attr, char 
}

static DEVICE_ATTR_RO(bus);



static ssize_t bdf_min_show(struct device *dev, struct device_attribute *attr, char *buf)

{

	struct hisi_pcie_pmu *pcie_pmu = to_pcie_pmu(dev_get_drvdata(dev));



	return sysfs_emit(buf, "%#04x\n", pcie_pmu->bdf_min);

}

static DEVICE_ATTR_RO(bdf_min);



static ssize_t bdf_max_show(struct device *dev, struct device_attribute *attr, char *buf)

{

	struct hisi_pcie_pmu *pcie_pmu = to_pcie_pmu(dev_get_drvdata(dev));



	return sysfs_emit(buf, "%#04x\n", pcie_pmu->bdf_max);

}

static DEVICE_ATTR_RO(bdf_max);



static struct hisi_pcie_reg_pair

hisi_pcie_parse_reg_value(struct hisi_pcie_pmu *pcie_pmu, u32 reg_off)

{
@@ -775,6 +791,8 @@ static const struct attribute_group hisi_pcie_pmu_format_group = { 


static struct attribute *hisi_pcie_pmu_bus_attrs[] = {

	&dev_attr_bus.attr,

	&dev_attr_bdf_max.attr,

	&dev_attr_bdf_min.attr,

	NULL

};