AXI performance monitor driver

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 <james.hughes@raspberrypi.org>
raspberrypi · Nov 2, 2017 · 8296317 · 8296317
1 parent b76f96e
commit 8296317
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diff --git a/arch/arm/boot/dts/bcm270x.dtsi b/arch/arm/boot/dts/bcm270x.dtsi
@@ -130,6 +130,14 @@
 			/* Add alias */
 			status = "disabled";
 		};
+
+		axiperf: axiperf {
+			compatible = "brcm,bcm2835-axiperf";
+			reg = <0x7e009800 0x100>,
+			      <0x7ee08000 0x100>;
+			firmware = <&firmware>;
+			status = "okay";
+		};
 	};
 
 	vdd_5v0_reg: fixedregulator_5v0 {

diff --git a/drivers/perf/Kconfig b/drivers/perf/Kconfig
@@ -43,4 +43,10 @@ config XGENE_PMU
         help
           Say y if you want to use APM X-Gene SoC performance monitors.
 
+config RPI_AXIPERF
+        depends on ARCH_BCM2835
+        bool "RaspberryPi AXI Performance monitors"
+        default n
+        help
+          Say y if you want to use Raspberry Pi AXI performance monitors
 endmenu
diff --git a/drivers/perf/Makefile b/drivers/perf/Makefile
@@ -3,3 +3,4 @@ obj-$(CONFIG_ARM_PMU_ACPI) += arm_pmu_acpi.o
 obj-$(CONFIG_QCOM_L2_PMU)	+= qcom_l2_pmu.o
 obj-$(CONFIG_QCOM_L3_PMU) += qcom_l3_pmu.o
 obj-$(CONFIG_XGENE_PMU) += xgene_pmu.o
+obj-$(CONFIG_RPI_AXIPERF) += raspberrypi_axi_monitor.o