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

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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: Yicong Yang <yangyicong@hisilicon.com>
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/20240829090332.28756-4-yangyicong@huawei.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Yicong Yang 2024-08-29 17:03:32 +08:00 committed by Will Deacon
parent 17bf68aeb3
commit d1c93d5c67
2 changed files with 21 additions and 1 deletions
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4
Documentation/admin-guide/perf/hisi-pcie-pmu.rst
View File

@ -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::

18
drivers/perf/hisilicon/hisi_pcie_pmu.c
View File

@ -141,6 +141,22 @@ 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)
{
@ -763,6 +779,8 @@ 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
};