drivers/perf: hisi: Add driver for HiSilicon PCIe PMU

PCIe PMU Root Complex Integrated End Point(RCiEP) device is supported
to sample bandwidth, latency, buffer occupation etc.

Each PMU RCiEP device monitors multiple Root Ports, and each RCiEP is
registered as a PMU in /sys/bus/event_source/devices, so users can
select target PMU, and use filter to do further sets.

Filtering options contains:
event        - select the event.
subevent     - select the subevent.
port         - select target Root Ports. Information of Root Ports
               are shown under sysfs.
bdf          - select requester_id of target EP device.
trig_len     - set trigger condition for starting event statistics.
trigger_mode - set trigger mode. 0 means starting to statistic when
               bigger than trigger condition, and 1 means smaller.
thr_len      - set threshold for statistics.
thr_mode     - set threshold mode. 0 means count when bigger than
               threshold, and 1 means smaller.

Signed-off-by: Qi Liu <liuqi115@huawei.com>

MAINTAINERS

@@ -8084,6 +8084,12 @@ W:	http://www.hisilicon.com
 F:	Documentation/admin-guide/perf/hisi-pmu.rst
 F:	drivers/perf/hisilicon
 
+HISILICON PCIE PMU DRIVER
+M:	Qi Liu <liuqi115@huawei.com>
+S:	Maintained
+F:	Documentation/admin-guide/perf/hisi-pcie-pmu.rst
+F:	drivers/perf/pci/hisilicon/hisi_pcie_pmu.c
+
 HISILICON QM AND ZIP Controller DRIVER
 M:	Zhou Wang <wangzhou1@hisilicon.com>
 L:	linux-crypto@vger.kernel.org

drivers/perf/Kconfig

@@ -139,4 +139,6 @@ config ARM_DMC620_PMU
 
 source "drivers/perf/hisilicon/Kconfig"
 
+source "drivers/perf/pci/Kconfig"
+
 endmenu

drivers/perf/Makefile

@@ -14,3 +14,4 @@ obj-$(CONFIG_THUNDERX2_PMU) += thunderx2_pmu.o
 obj-$(CONFIG_XGENE_PMU) += xgene_pmu.o
 obj-$(CONFIG_ARM_SPE_PMU) += arm_spe_pmu.o
 obj-$(CONFIG_ARM_DMC620_PMU) += arm_dmc620_pmu.o
+obj-y += pci/

drivers/perf/pci/Kconfig

@@ -0,0 +1,16 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# PCIe Performance Monitor Drivers
+#
+menu "PCIe Performance Monitor"
+
+config HISI_PCIE_PMU
+	tristate "HiSilicon PCIE PERF PMU"
+	depends on (ARM64 && PCI) || COMPILE_TEST
+	help
+	  Provide support for HiSilicon PCIe performance monitoring unit (PMU)
+	  RCiEP devices.
+	  Adds the PCIe PMU into perf events system for monitoring latency,
+	  bandwidth etc.
+
+endmenu

drivers/perf/pci/Makefile

@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-y += hisilicon/

drivers/perf/pci/hisilicon/Makefile

@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+obj-$(CONFIG_HISI_PCIE_PMU) += hisi_pcie_pmu.o