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linux-loongson/drivers/perf/Kconfig
Rob Herring (Arm) 58074a0fce perf: arm_pmuv3: Add support for the Branch Record Buffer Extension (BRBE) 
The ARMv9.2 architecture introduces the optional Branch Record Buffer
Extension (BRBE), which records information about branches as they are
executed into set of branch record registers. BRBE is similar to x86's
Last Branch Record (LBR) and PowerPC's Branch History Rolling Buffer
(BHRB).

BRBE supports filtering by exception level and can filter just the
source or target address if excluded to avoid leaking privileged
addresses. The h/w filter would be sufficient except when there are
multiple events with disjoint filtering requirements. In this case, BRBE
is configured with a union of all the events' desired branches, and then
the recorded branches are filtered based on each event's filter. For
example, with one event capturing kernel events and another event
capturing user events, BRBE will be configured to capture both kernel
and user branches. When handling event overflow, the branch records have
to be filtered by software to only include kernel or user branch
addresses for that event. In contrast, x86 simply configures LBR using
the last installed event which seems broken.

It is possible on x86 to configure branch filter such that no branches
are ever recorded (e.g. -j save_type). For BRBE, events with a
configuration that will result in no samples are rejected.

Recording branches in KVM guests is not supported like x86. However,
perf on x86 allows requesting branch recording in guests. The guest
events are recorded, but the resulting branches are all from the host.
For BRBE, events with branch recording and "exclude_host" set are
rejected. Requiring "exclude_guest" to be set did not work. The default
for the perf tool does set "exclude_guest" if no exception level
options are specified. However, specifying kernel or user events
defaults to including both host and guest. In this case, only host
branches are recorded.

BRBE can support some additional exception branch types compared to
x86. On x86, all exceptions other than syscalls are recorded as IRQ.
With BRBE, it is possible to better categorize these exceptions. One
limitation relative to x86 is we cannot distinguish a syscall return
from other exception returns. So all exception returns are recorded as
ERET type. The FIQ branch type is omitted as the only FIQ user is Apple
platforms which don't support BRBE. The debug branch types are omitted
as there is no clear need for them.

BRBE records are invalidated whenever events are reconfigured, a new
task is scheduled in, or after recording is paused (and the records
have been recorded for the event). The architecture allows branch
records to be invalidated by the PE under implementation defined
conditions. It is expected that these conditions are rare.

Cc: Catalin Marinas <catalin.marinas@arm.com>
Co-developed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Co-developed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: James Clark <james.clark@linaro.org>
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
tested-by: Adam Young <admiyo@os.amperecomputing.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/20250611-arm-brbe-v19-v23-4-e7775563036e@kernel.org
[will: Fix sparse warnings about mixed declarations and code.
       Fix C99 comment syntax.]
Signed-off-by: Will Deacon <will@kernel.org>
2025-07-08 17:58:49 +01:00

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# SPDX-License-Identifier: GPL-2.0-only
#
# Performance Monitor Drivers
#
menu "Performance monitor support"
depends on PERF_EVENTS
config ARM_CCI_PMU
tristate "ARM CCI PMU driver"
depends on (ARM && CPU_V7) || ARM64
select ARM_CCI
help
Support for PMU events monitoring on the ARM CCI (Cache Coherent
Interconnect) family of products.
If compiled as a module, it will be called arm-cci.
config ARM_CCI400_PMU
bool "support CCI-400"
default y
depends on ARM_CCI_PMU
select ARM_CCI400_COMMON
help
CCI-400 provides 4 independent event counters counting events related
to the connected slave/master interfaces, plus a cycle counter.
config ARM_CCI5xx_PMU
bool "support CCI-500/CCI-550"
default y
depends on ARM_CCI_PMU
help
CCI-500/CCI-550 both provide 8 independent event counters, which can
count events pertaining to the slave/master interfaces as well as the
internal events to the CCI.
config ARM_CCN
tristate "ARM CCN driver support"
depends on ARM || ARM64 || COMPILE_TEST
help
PMU (perf) driver supporting the ARM CCN (Cache Coherent Network)
interconnect.
config ARM_CMN
tristate "Arm CMN-600 PMU support"
depends on ARM64 || COMPILE_TEST
help
Support for PMU events monitoring on the Arm CMN-600 Coherent Mesh
Network interconnect.
config ARM_NI
tristate "Arm NI-700 PMU support"
depends on ARM64 || COMPILE_TEST
help
Support for PMU events monitoring on the Arm NI-700 Network-on-Chip
interconnect and family.
config ARM_PMU
depends on ARM || ARM64
bool "ARM PMU framework"
default y
help
Say y if you want to use CPU performance monitors on ARM-based
systems.
config ARM_V6_PMU
depends on ARM_PMU && (CPU_V6 || CPU_V6K)
def_bool y
config ARM_V7_PMU
depends on ARM_PMU && CPU_V7
def_bool y
config ARM_XSCALE_PMU
depends on ARM_PMU && CPU_XSCALE
def_bool y
config RISCV_PMU
depends on RISCV
bool "RISC-V PMU framework"
default y
help
Say y if you want to use CPU performance monitors on RISCV-based
systems. This provides the core PMU framework that abstracts common
PMU functionalities in a core library so that different PMU drivers
can reuse it.
config RISCV_PMU_LEGACY
depends on RISCV_PMU
bool "RISC-V legacy PMU implementation"
default y
help
Say y if you want to use the legacy CPU performance monitor
implementation on RISC-V based systems. This only allows counting
of cycle/instruction counter and doesn't support counter overflow,
or programmable counters. It will be removed in future.
config RISCV_PMU_SBI
depends on RISCV_PMU && RISCV_SBI
bool "RISC-V PMU based on SBI PMU extension"
default y
help
Say y if you want to use the CPU performance monitor
using SBI PMU extension on RISC-V based systems. This option provides
full perf feature support i.e. counter overflow, privilege mode
filtering, counter configuration.
config STARFIVE_STARLINK_PMU
depends on ARCH_STARFIVE || COMPILE_TEST
depends on 64BIT
bool "StarFive StarLink PMU"
help
Provide support for StarLink Performance Monitor Unit.
StarLink Performance Monitor Unit integrates one or more cores with
an L3 memory system. The L3 cache events are added into perf event
subsystem, allowing monitoring of various L3 cache perf events.
config ANDES_CUSTOM_PMU
bool "Andes custom PMU support"
depends on ARCH_RENESAS && RISCV_ALTERNATIVE && RISCV_PMU_SBI
default y
help
The Andes cores implement the PMU overflow extension very
similar to the standard Sscofpmf and Smcntrpmf extension.
This will patch the overflow and pending CSRs and handle the
non-standard behaviour via the regular SBI PMU driver and
interface.
If you don't know what to do here, say "Y".
config ARM_PMU_ACPI
depends on ARM_PMU && ACPI
def_bool y
config ARM_SMMU_V3_PMU
tristate "ARM SMMUv3 Performance Monitors Extension"
depends on ARM64 || (COMPILE_TEST && 64BIT)
depends on GENERIC_MSI_IRQ
help
Provides support for the ARM SMMUv3 Performance Monitor Counter
Groups (PMCG), which provide monitoring of transactions passing
through the SMMU and allow the resulting information to be filtered
based on the Stream ID of the corresponding master.
config ARM_PMUV3
depends on HW_PERF_EVENTS && ((ARM && CPU_V7) || ARM64)
bool "ARM PMUv3 support" if !ARM64
default ARM64
help
Say y if you want to use the ARM performance monitor unit (PMU)
version 3. The PMUv3 is the CPU performance monitors on ARMv8
(aarch32 and aarch64) systems that implement the PMUv3
architecture.
config ARM_DSU_PMU
tristate "ARM DynamIQ Shared Unit (DSU) PMU"
depends on ARM64
help
Provides support for performance monitor unit in ARM DynamIQ Shared
Unit (DSU). The DSU integrates one or more cores with an L3 memory
system, control logic. The PMU allows counting various events related
to DSU.
config FSL_IMX8_DDR_PMU
tristate "Freescale i.MX8 DDR perf monitor"
depends on ARCH_MXC || COMPILE_TEST
help
Provides support for the DDR performance monitor in i.MX8, which
can give information about memory throughput and other related
events.
config FSL_IMX9_DDR_PMU
tristate "Freescale i.MX9 DDR perf monitor"
depends on ARCH_MXC
help
Provides support for the DDR performance monitor in i.MX9, which
can give information about memory throughput and other related
events.
config QCOM_L2_PMU
bool "Qualcomm Technologies L2-cache PMU"
depends on ARCH_QCOM && ARM64 && ACPI
select QCOM_KRYO_L2_ACCESSORS
help
Provides support for the L2 cache performance monitor unit (PMU)
in Qualcomm Technologies processors.
Adds the L2 cache PMU into the perf events subsystem for
monitoring L2 cache events.
config QCOM_L3_PMU
bool "Qualcomm Technologies L3-cache PMU"
depends on ARCH_QCOM && ARM64 && ACPI
select QCOM_IRQ_COMBINER
help
Provides support for the L3 cache performance monitor unit (PMU)
in Qualcomm Technologies processors.
Adds the L3 cache PMU into the perf events subsystem for
monitoring L3 cache events.
config THUNDERX2_PMU
tristate "Cavium ThunderX2 SoC PMU UNCORE"
depends on ARCH_THUNDER2 || COMPILE_TEST
depends on NUMA && ACPI
default m if ARCH_THUNDER2
help
Provides support for ThunderX2 UNCORE events.
The SoC has PMU support in its L3 cache controller (L3C) and
in the DDR4 Memory Controller (DMC).
config XGENE_PMU
depends on ARCH_XGENE || (COMPILE_TEST && 64BIT)
bool "APM X-Gene SoC PMU"
default n
help
Say y if you want to use APM X-Gene SoC performance monitors.
config ARM_SPE_PMU
tristate "Enable support for the ARMv8.2 Statistical Profiling Extension"
depends on ARM64
help
Enable perf support for the ARMv8.2 Statistical Profiling
Extension, which provides periodic sampling of operations in
the CPU pipeline and reports this via the perf AUX interface.
config ARM64_BRBE
bool "Enable support for branch stack sampling using FEAT_BRBE"
depends on ARM_PMUV3 && ARM64
default y
help
Enable perf support for Branch Record Buffer Extension (BRBE) which
records all branches taken in an execution path. This supports some
branch types and privilege based filtering. It captures additional
relevant information such as cycle count, misprediction and branch
type, branch privilege level etc.
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.
config MARVELL_CN10K_TAD_PMU
tristate "Marvell CN10K LLC-TAD PMU"
depends on ARCH_THUNDER || (COMPILE_TEST && 64BIT)
help
Provides support for Last-Level cache Tag-and-data Units (LLC-TAD)
performance monitors on CN10K family silicons.
config APPLE_M1_CPU_PMU
bool "Apple M1 CPU PMU support"
depends on ARM_PMU && ARCH_APPLE
help
Provides support for the non-architectural CPU PMUs present on
the Apple M1 SoCs and derivatives.
config ALIBABA_UNCORE_DRW_PMU
tristate "Alibaba T-Head Yitian 710 DDR Sub-system Driveway PMU driver"
depends on (ARM64 && ACPI) || COMPILE_TEST
help
Support for Driveway PMU events monitoring on Yitian 710 DDR
Sub-system.
source "drivers/perf/hisilicon/Kconfig"
config MARVELL_CN10K_DDR_PMU
tristate "Enable MARVELL CN10K DRAM Subsystem(DSS) PMU Support"
depends on ARCH_THUNDER || (COMPILE_TEST && 64BIT)
help
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"
config CXL_PMU
tristate "CXL Performance Monitoring Unit"
depends on CXL_BUS
help
Support performance monitoring as defined in CXL rev 3.0
section 13.2: Performance Monitoring. CXL components may have
one or more CXL Performance Monitoring Units (CPMUs).
Say 'y/m' to enable a driver that will attach to performance
monitoring units and provide standard perf based interfaces.
If unsure say 'm'.
config MARVELL_PEM_PMU
tristate "MARVELL PEM PMU Support"
depends on ARCH_THUNDER || (COMPILE_TEST && 64BIT)
help
Enable support for PCIe Interface performance monitoring
on Marvell platform.
endmenu
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