AXI performance monitor driver (#2222)

Uses the debugfs I/F to provide access to the AXI
bus performance monitors.

Requires the new mailbox peripheral access for access
to the VPU performance registers, system bus access
is done using direct register reads.

Signed-off-by: James Hughes <[email protected]>

raspberrypi_axi_monitor: suppress warning

Suppress the following warning by casting the pointer to and uintptr_t
before to u32:

Signed-off-by: Matteo Croce <[email protected]>

perf/raspberry: Add support for 2712 axi performance monitors

Also handle 2711 correctly which has a different configuration
from 2835.

Signed-off-by: Dom Cobley <[email protected]>

Author: JamesH65

drivers/perf/Kconfig

@@ -251,6 +251,14 @@ config ALIBABA_UNCORE_DRW_PMU
 	  Support for Driveway PMU events monitoring on Yitian 710 DDR
 	  Sub-system.
 
+config RPI_AXIPERF
+        depends on ARCH_BCM2835
+        tristate "RaspberryPi AXI Performance monitors"
+        default n
+        help
+          Say y if you want to use Raspberry Pi AXI performance monitors, m if
+          you want to build it as a module.
+
 source "drivers/perf/hisilicon/Kconfig"
 
 config MARVELL_CN10K_DDR_PMU

drivers/perf/Makefile

@@ -33,3 +33,4 @@ 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
+obj-$(CONFIG_RPI_AXIPERF) += raspberrypi_axi_monitor.o