Commit 53c218da authored Nov 04, 2020 by Tuan Phan Committed by Will Deacon Nov 25, 2020

driver/perf: Add PMU driver for the ARM DMC-620 memory controller



DMC-620 PMU supports total 10 counters which each is
independently programmable to different events and can
be started and stopped individually.

Currently, it only supports ACPI. Other platforms feel free to test and add
support for device tree.

Usage example:
  #perf stat -e arm_dmc620_10008c000/clk_cycle_count/ -C 0
  Get perf event for clk_cycle_count counter.

  #perf stat -e arm_dmc620_10008c000/clkdiv2_allocate,mask=0x1f,match=0x2f,
  incr=2,invert=1/ -C 0
  The above example shows how to specify mask, match, incr,
  invert parameters for clkdiv2_allocate event.

Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Tuan Phan <tuanphan@os.amperecomputing.com>
Link: https://lore.kernel.org/r/1604518246-6198-1-git-send-email-tuanphan@os.amperecomputing.com


Signed-off-by: Will Deacon <will@kernel.org>

parent f8394f23

drivers/perf/Kconfig

+7 −0

Original line number	Diff line number	Diff line
		@@ -130,6 +130,13 @@ config ARM_SPE_PMU
		Extension, which provides periodic sampling of operations in
		the CPU pipeline and reports this via the perf AUX interface.

		config ARM_DMC620_PMU
		tristate "Enable PMU support for the ARM DMC-620 memory controller"
		depends on (ARM64 && ACPI) \|\| COMPILE_TEST
		help
		Support for PMU events monitoring on the ARM DMC-620 memory
		controller.

		source "drivers/perf/hisilicon/Kconfig"

		endmenu

drivers/perf/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -13,3 +13,4 @@ obj-$(CONFIG_QCOM_L3_PMU) += qcom_l3_pmu.o
		obj-$(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

drivers/perf/arm_dmc620_pmu.c

0 → 100644

+748 −0

File added.

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