drivers/perf: add DesignWare PCIe PMU driver

This commit adds the PCIe Performance Monitoring Unit (PMU) driver support
for T-Head Yitian SoC chip. Yitian is based on the Synopsys PCI Express
Core controller IP which provides statistics feature. The PMU is a PCIe
configuration space register block provided by each PCIe Root Port in a
Vendor-Specific Extended Capability named RAS D.E.S (Debug, Error
injection, and Statistics).

To facilitate collection of statistics the controller provides the
following two features for each Root Port:

- one 64-bit counter for Time Based Analysis (RX/TX data throughput and
  time spent in each low-power LTSSM state) and
- one 32-bit counter for Event Counting (error and non-error events for
  a specified lane)

Note: There is no interrupt for counter overflow.

This driver adds PMU devices for each PCIe Root Port. And the PMU device is
named based the BDF of Root Port. For example,

    30:03.0 PCI bridge: Device 1ded:8000 (rev 01)

the PMU device name for this Root Port is dwc_rootport_3018.

Example usage of counting PCIe RX TLP data payload (Units of bytes)::

    $# perf stat -a -e dwc_rootport_3018/Rx_PCIe_TLP_Data_Payload/

average RX bandwidth can be calculated like this:

    PCIe TX Bandwidth = Rx_PCIe_TLP_Data_Payload / Measure_Time_Window

Signed-off-by: Shuai Xue <[email protected]>
Reviewed-by: Baolin Wang <[email protected]>
Reviewed-by: Jonathan Cameron <[email protected]>
Reviewed-by: Yicong Yang <[email protected]>
Reviewed-and-tested-by: Ilkka Koskinen <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[will: Fix sparse error due to use of uninitialised 'vsec' symbol in
 dwc_pcie_match_des_cap()]
Signed-off-by: Will Deacon <[email protected]>

Author: axiqia

drivers/perf/Kconfig

@@ -217,6 +217,13 @@ config MARVELL_CN10K_DDR_PMU
 	  Enable perf support for Marvell DDR Performance monitoring
 	  event on CN10K platform.
 
+config DWC_PCIE_PMU
+	tristate "Synopsys DesignWare PCIe PMU"
+	depends on PCI
+	help
+	  Enable perf support for Synopsys DesignWare PCIe PMU Performance
+	  monitoring event on platform including the Alibaba Yitian 710.
+
 source "drivers/perf/arm_cspmu/Kconfig"
 
 source "drivers/perf/amlogic/Kconfig"

drivers/perf/Makefile

@@ -23,6 +23,7 @@ obj-$(CONFIG_MARVELL_CN10K_TAD_PMU) += marvell_cn10k_tad_pmu.o
 obj-$(CONFIG_MARVELL_CN10K_DDR_PMU) += marvell_cn10k_ddr_pmu.o
 obj-$(CONFIG_APPLE_M1_CPU_PMU) += apple_m1_cpu_pmu.o
 obj-$(CONFIG_ALIBABA_UNCORE_DRW_PMU) += alibaba_uncore_drw_pmu.o
+obj-$(CONFIG_DWC_PCIE_PMU) += dwc_pcie_pmu.o
 obj-$(CONFIG_ARM_CORESIGHT_PMU_ARCH_SYSTEM_PMU) += arm_cspmu/
 obj-$(CONFIG_MESON_DDR_PMU) += amlogic/
 obj-$(CONFIG_CXL_PMU) += cxl_pmu.o