CoreSight

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2845 discussions

Re: [PATCH V3 2/4] arm_pmu: acpi: Add a representative platform device for TRBE

by Anshuman Khandual

On 8/3/23 14:44, Yicong Yang wrote: > On 2023/8/3 13:56, Anshuman Khandual wrote: >> ACPI TRBE does not have a HID for identification which could create and add >> a platform device into the platform bus. Also without a platform device, it >> cannot be probed and bound to a platform driver. >> >> This creates a dummy platform device for TRBE after ascertaining that ACPI >> provides required interrupts uniformly across all cpus on the system. This >> device gets created inside drivers/perf/arm_pmu_acpi.c to accommodate TRBE >> being built as a module. >> >> Cc: Catalin Marinas <catalin.marinas(a)arm.com> >> Cc: Will Deacon <will(a)kernel.org> >> Cc: Mark Rutland <mark.rutland(a)arm.com> >> Cc: linux-arm-kernel(a)lists.infradead.org >> Cc: linux-kernel(a)vger.kernel.org >> Signed-off-by: Anshuman Khandual <anshuman.khandual(a)arm.com> >> --- >> arch/arm64/include/asm/acpi.h | 3 +++ >> drivers/perf/arm_pmu_acpi.c | 37 ++++++++++++++++++++++++++++++++++- >> include/linux/perf/arm_pmu.h | 1 + >> 3 files changed, 40 insertions(+), 1 deletion(-) >> >> diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h >> index bd68e1b7f29f..4d537d56eb84 100644 >> --- a/arch/arm64/include/asm/acpi.h >> +++ b/arch/arm64/include/asm/acpi.h >> @@ -42,6 +42,9 @@ >> #define ACPI_MADT_GICC_SPE (offsetof(struct acpi_madt_generic_interrupt, \ >> spe_interrupt) + sizeof(u16)) >> >> +#define ACPI_MADT_GICC_TRBE (offsetof(struct acpi_madt_generic_interrupt, \ >> + trbe_interrupt) + sizeof(u16)) >> + >> /* Basic configuration for ACPI */ >> #ifdef CONFIG_ACPI >> pgprot_t __acpi_get_mem_attribute(phys_addr_t addr); >> diff --git a/drivers/perf/arm_pmu_acpi.c b/drivers/perf/arm_pmu_acpi.c >> index 235c14766a36..79feea548e6e 100644 >> --- a/drivers/perf/arm_pmu_acpi.c >> +++ b/drivers/perf/arm_pmu_acpi.c >> @@ -69,7 +69,7 @@ static void arm_pmu_acpi_unregister_irq(int cpu) >> acpi_unregister_gsi(gsi); >> } >> >> -#if IS_ENABLED(CONFIG_ARM_SPE_PMU) >> +#if IS_ENABLED(CONFIG_ARM_SPE_PMU) || IS_ENABLED(CONFIG_CORESIGHT_TRBE) >> static int >> arm_acpi_register_pmu_device(struct platform_device *pdev, u8 len, >> u16 (*parse_gsi)(struct acpi_madt_generic_interrupt *)) >> @@ -166,6 +166,40 @@ static inline void arm_spe_acpi_register_device(void) >> } >> #endif /* CONFIG_ARM_SPE_PMU */ >> >> +#ifdef CONFIG_CORESIGHT_TRBE > Maybe we should use #if IS_ENABLED(CONFIG_CORESIGHT_TRBE) here and other places? > > As trbe can be configured as a module, when CONFIG_CORESIGHT_TRBE=m this block > won't be compiled. Referred to > > https://github.com/torvalds/linux/blob/c7c90e121e992eefdf07945e5a6e9cf097b2… You are right, just making CONFIG_CORESIGHT_TRBE=m make it fall back on the stub arm_trbe_acpi_register_device() definition, which does not create the required dummy platform device thus preventing TRBE probe on the platform. Will change the above #ifdef as IS_ENABLED() for CONFIG_CORESIGHT_TRBE and revert back using IS_ENABLED() in the previous patch for CONFIG_ARM_SPE_PMU as well. Thanks for noticing this problem.

3 years, 1 month

[PATCH 0/2] coresight: Allow guests to be traced when FEAT_TRF and VHE are present

by James Clark

The first commit moves the register to sysreg because I add the EL12 version in the second commit. I couldn't really think of the best way to make it fit in sysreg without any changes, because all the fields are shared between EL1 and EL2 except for the CX bit which was named differently for that reason in the original definition. The CX bit only exists in TRFCR_EL2. The test results have some single spurious EL2 addresses, but I don't think this is an issue with this patchset because it happens in the host-userspace case which maintains the existing programming of TRFCR. It's likely an issue with the model but I will follow it up separately. James Clark (2): arm64/sysreg: Move TRFCR definitions to sysreg coresight: Allow guests to be traced when FEAT_TRF and VHE are present arch/arm64/include/asm/sysreg.h | 12 ----- arch/arm64/tools/sysreg | 26 ++++++++++ .../coresight/coresight-etm4x-core.c | 47 ++++++++++++++++--- drivers/hwtracing/coresight/coresight-etm4x.h | 2 +- drivers/hwtracing/coresight/coresight-priv.h | 3 ++ 5 files changed, 70 insertions(+), 20 deletions(-) -- 2.34.1

3 years, 1 month

[PATCH] coresight: trbe: Directly use ID_AA64DFR0_EL1_TraceBuffer_IMP

by Anshuman Khandual

is_trbe_available() checks for the TRBE support via extracting TraceBuffer field value from ID_AA64DFR0_EL1, and ensures that it is implemented. This replaces the open encoding '0b0001' with 'ID_AA64DFR0_EL1_TraceBuffer_IMP' which is now available via sysreg tools. Functional change is not intended. Cc: Suzuki K Poulose <suzuki.poulose(a)arm.com> Cc: Mike Leach <mike.leach(a)linaro.org> Cc: James Clark <james.clark(a)arm.com> Cc: Leo Yan <leo.yan(a)linaro.org> Cc: coresight(a)lists.linaro.org Cc: linux-arm-kernel(a)lists.infradead.org Cc: linux-kernel(a)vger.kernel.org Signed-off-by: Anshuman Khandual <anshuman.khandual(a)arm.com> --- drivers/hwtracing/coresight/coresight-trbe.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/hwtracing/coresight/coresight-trbe.h b/drivers/hwtracing/coresight/coresight-trbe.h index 94e67009848a..ebb9108d8e24 100644 --- a/drivers/hwtracing/coresight/coresight-trbe.h +++ b/drivers/hwtracing/coresight/coresight-trbe.h @@ -24,7 +24,7 @@ static inline bool is_trbe_available(void) unsigned int trbe = cpuid_feature_extract_unsigned_field(aa64dfr0, ID_AA64DFR0_EL1_TraceBuffer_SHIFT); - return trbe >= 0b0001; + return trbe >= ID_AA64DFR0_EL1_TraceBuffer_IMP; } static inline bool is_trbe_enabled(void) -- 2.25.1

3 years, 1 month

Re: [PATCH V2 0/4] coresight: trbe: Enable ACPI based devices

by Anshuman Khandual

On 8/1/23 20:22, Will Deacon wrote: > On Tue, Aug 01, 2023 at 03:10:48PM +0530, Anshuman Khandual wrote: >> This series enables detection of ACPI based TRBE devices via a stand alone >> purpose built representative platform device. But as a pre-requisite this >> changes coresight_platform_data structure assignment for the TRBE device. >> >> This series is based on v6.5-rc4 kernel, is also dependent on the following >> EDK2 changes posted earlier by Sami. >> >> https://edk2.groups.io/g/devel/message/107239 >> https://edk2.groups.io/g/devel/message/107241 >> >> Changes in V2: >> >> - Refactored arm_spe_acpi_register_device() in a separate patch >> - Renamed trbe_acpi_resources as trbe_resources >> - Renamed trbe_acpi_dev as trbe_dev >> >> Changes in V1: >> >> https://lore.kernel.org/all/20230728112733.359620-1-anshuman.khandual@arm.c… >> >> Cc: Sami Mujawar <sami.mujawar(a)arm.com> >> Cc: Catalin Marinas <catalin.marinas(a)arm.com> >> Cc: Will Deacon <will(a)kernel.org> >> Cc: Mark Rutland <mark.rutland(a)arm.com> >> Cc: Suzuki K Poulose <suzuki.poulose(a)arm.com> >> Cc: Mike Leach <mike.leach(a)linaro.org> >> Cc: Leo Yan <leo.yan(a)linaro.org> >> Cc: Alexander Shishkin <alexander.shishkin(a)linux.intel.com> >> Cc: James Clark <james.clark(a)arm.com> >> Cc: coresight(a)lists.linaro.org >> Cc: linux-arm-kernel(a)lists.infradead.org >> Cc: linux-kernel(a)vger.kernel.org > > FYI: if you pass '--cc-cover' to git send-email, it will CC all these > folks on the series, which I think is better when you're reviewing stuff > (I didn't receive patches 3 and 4). My bad, forgot --cc-cover on the command line.

3 years, 1 month

[PATCH V2 0/4] coresight: trbe: Enable ACPI based devices

by Anshuman Khandual

This series enables detection of ACPI based TRBE devices via a stand alone purpose built representative platform device. But as a pre-requisite this changes coresight_platform_data structure assignment for the TRBE device. This series is based on v6.5-rc4 kernel, is also dependent on the following EDK2 changes posted earlier by Sami. https://edk2.groups.io/g/devel/message/107239 https://edk2.groups.io/g/devel/message/107241 Changes in V2: - Refactored arm_spe_acpi_register_device() in a separate patch - Renamed trbe_acpi_resources as trbe_resources - Renamed trbe_acpi_dev as trbe_dev Changes in V1: https://lore.kernel.org/all/20230728112733.359620-1-anshuman.khandual@arm.c… Cc: Sami Mujawar <sami.mujawar(a)arm.com> Cc: Catalin Marinas <catalin.marinas(a)arm.com> Cc: Will Deacon <will(a)kernel.org> Cc: Mark Rutland <mark.rutland(a)arm.com> Cc: Suzuki K Poulose <suzuki.poulose(a)arm.com> Cc: Mike Leach <mike.leach(a)linaro.org> Cc: Leo Yan <leo.yan(a)linaro.org> Cc: Alexander Shishkin <alexander.shishkin(a)linux.intel.com> Cc: James Clark <james.clark(a)arm.com> Cc: coresight(a)lists.linaro.org Cc: linux-arm-kernel(a)lists.infradead.org Cc: linux-kernel(a)vger.kernel.org Anshuman Khandual (4): arm_pmu: acpi: Refactor arm_spe_acpi_register_device() arm_pmu: acpi: Add a representative platform device for TRBE coresight: trbe: Add a representative coresight_platform_data for TRBE coresight: trbe: Enable ACPI based TRBE devices arch/arm64/include/asm/acpi.h | 3 + drivers/hwtracing/coresight/coresight-trbe.c | 15 +- drivers/hwtracing/coresight/coresight-trbe.h | 1 + drivers/perf/arm_pmu_acpi.c | 145 ++++++++++++++----- include/linux/perf/arm_pmu.h | 1 + 5 files changed, 122 insertions(+), 43 deletions(-) -- 2.25.1

3 years, 1 month

[PATCH 0/3] coresight: trbe: Enable ACPI based devices

by Anshuman Khandual

This series enables detection of ACPI based TRBE devices via a stand alone purpose built representative platform device. But as a pre-requisite this changes coresight_platform_data structure assignment for the TRBE device. This series is based on v6.5-rc1 kernel, is also dependent on the following EDK2 changes posted earlier by Sami. https://edk2.groups.io/g/devel/message/107239 https://edk2.groups.io/g/devel/message/107241 Cc: Sami Mujawar <sami.mujawar(a)arm.com> Cc: Catalin Marinas <catalin.marinas(a)arm.com> Cc: Will Deacon <will(a)kernel.org> Cc: Mark Rutland <mark.rutland(a)arm.com> Cc: Suzuki K Poulose <suzuki.poulose(a)arm.com> Cc: Mike Leach <mike.leach(a)linaro.org> Cc: Leo Yan <leo.yan(a)linaro.org> Cc: Alexander Shishkin <alexander.shishkin(a)linux.intel.com> Cc: James Clark <james.clark(a)arm.com> Cc: coresight(a)lists.linaro.org Cc: linux-arm-kernel(a)lists.infradead.org Cc: linux-kernel(a)vger.kernel.org Anshuman Khandual (3): arm_pmu: acpi: Add a representative platform device for TRBE coresight: trbe: Add a representative coresight_platform_data for TRBE coresight: trbe: Enable ACPI based TRBE devices arch/arm64/include/asm/acpi.h | 3 + drivers/hwtracing/coresight/coresight-trbe.c | 15 ++++- drivers/hwtracing/coresight/coresight-trbe.h | 1 + drivers/perf/arm_pmu_acpi.c | 63 ++++++++++++++++++++ include/linux/perf/arm_pmu.h | 1 + 5 files changed, 80 insertions(+), 3 deletions(-) -- 2.25.1

3 years, 1 month

Re: [PATCH V6 0/6] coresight: etm4x: Migrate ACPI AMBA devices to platform driver

by Suzuki K Poulose

On 26/07/2023 18:03, Steve Clevenger OS wrote: > > Hi Suzuki, > > On 7/26/2023 9:59 AM, Suzuki K Poulose wrote: >> On 10/07/2023 07:24, Anshuman Khandual wrote: >>> CoreSight ETM4x devices could be accessed either via MMIO (handled via >>> amba_driver) or CPU system instructions (handled via platform driver). >>> But >>> this has the following issues : >>> >>> - Each new CPU comes up with its own PID and thus we need to keep on >>> adding the "known" PIDs to get it working with AMBA driver. While >>> the ETM4 architecture (and CoreSight architecture) defines way to >>> identify a device as ETM4. Thus older kernels won't be able to >>> "discover" a newer CPU, unless we add the PIDs. >>> >>> - With ACPI, the ETM4x devices have the same HID to identify the >>> device >>> irrespective of the mode of access. This creates a problem where two >>> different drivers (both AMBA based driver and platform driver) would >>> hook into the "HID" and could conflict. e.g., if AMBA driver gets >>> hold of a non-MMIO device, the probe fails. If we have single driver >>> hooked into the given "HID", we could handle them seamlessly, >>> irrespective of the mode of access. >>> >>> - CoreSight is heavily dependent on the runtime power management. With >>> ACPI, amba_driver doesn't get us anywhere with handling the power >>> and thus one need to always turn the power ON to use them. Moving to >>> platform driver gives us the power management for free. >>> >>> Due to all of the above, we are moving ACPI MMIO based etm4x devices >>> to be >>> supported via tha platform driver. The series makes the existing platform >>> driver generic to handle both type of the access modes. Although existing >>> AMBA driver would still continue to support DT based etm4x MMIO devices. >>> Although some problems still remain, such as manually adding PIDs for all >>> new AMBA DT based devices. >>> >>> The series applies on 6.5-rc1. >>> >>> Changes in V6: >>> >>> - Rebased on 6.5-rc1 >>> >> >> I have queued this version for v6.6, should appear on coresight/next soon. >> >> Suzuki > > Is there anyway to queue this for 6.5? Or has that ship sailed? Only fixes are allowed for v6.5 at this time. Suzuki > > Thanks, > > Steve C.

3 years, 1 month

[PATCH] coresight: Fix all W=1 build warnings

by James Clark

The kernel test robot looks for new warnings in a W=1 build, so fix all the existing warnings to make it easier to spot new ones when building locally. The fixes are for undocumented function arguments and an incorrect doc style. Signed-off-by: James Clark <james.clark(a)arm.com> --- drivers/hwtracing/coresight/coresight-cti-core.c | 2 +- drivers/hwtracing/coresight/coresight-etm4x-cfg.c | 4 ++-- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/hwtracing/coresight/coresight-cti-core.c b/drivers/hwtracing/coresight/coresight-cti-core.c index 7023ff70cc28..3999d0a2cb60 100644 --- a/drivers/hwtracing/coresight/coresight-cti-core.c +++ b/drivers/hwtracing/coresight/coresight-cti-core.c @@ -22,7 +22,7 @@ #include "coresight-priv.h" #include "coresight-cti.h" -/** +/* * CTI devices can be associated with a PE, or be connected to CoreSight * hardware. We have a list of all CTIs irrespective of CPU bound or * otherwise. diff --git a/drivers/hwtracing/coresight/coresight-etm4x-cfg.c b/drivers/hwtracing/coresight/coresight-etm4x-cfg.c index d2ea903231b2..c302072b293a 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x-cfg.c +++ b/drivers/hwtracing/coresight/coresight-etm4x-cfg.c @@ -40,7 +40,7 @@ * Invalid offsets will result in fail code return and feature load failure. * * @drvdata: driver data to map into. - * @reg: register to map. + * @reg_csdev: register to map. * @offset: device offset for the register */ static int etm4_cfg_map_reg_offset(struct etmv4_drvdata *drvdata, @@ -132,7 +132,7 @@ static int etm4_cfg_map_reg_offset(struct etmv4_drvdata *drvdata, * etm4_cfg_load_feature - load a feature into a device instance. * * @csdev: An ETMv4 CoreSight device. - * @feat: The feature to be loaded. + * @feat_csdev: The feature to be loaded. * * The function will load a feature instance into the device, checking that * the register definitions are valid for the device. -- 2.34.1

3 years, 1 month

[PATCH V6 0/6] coresight: etm4x: Migrate ACPI AMBA devices to platform driver

by Anshuman Khandual

CoreSight ETM4x devices could be accessed either via MMIO (handled via amba_driver) or CPU system instructions (handled via platform driver). But this has the following issues : - Each new CPU comes up with its own PID and thus we need to keep on adding the "known" PIDs to get it working with AMBA driver. While the ETM4 architecture (and CoreSight architecture) defines way to identify a device as ETM4. Thus older kernels won't be able to "discover" a newer CPU, unless we add the PIDs. - With ACPI, the ETM4x devices have the same HID to identify the device irrespective of the mode of access. This creates a problem where two different drivers (both AMBA based driver and platform driver) would hook into the "HID" and could conflict. e.g., if AMBA driver gets hold of a non-MMIO device, the probe fails. If we have single driver hooked into the given "HID", we could handle them seamlessly, irrespective of the mode of access. - CoreSight is heavily dependent on the runtime power management. With ACPI, amba_driver doesn't get us anywhere with handling the power and thus one need to always turn the power ON to use them. Moving to platform driver gives us the power management for free. Due to all of the above, we are moving ACPI MMIO based etm4x devices to be supported via tha platform driver. The series makes the existing platform driver generic to handle both type of the access modes. Although existing AMBA driver would still continue to support DT based etm4x MMIO devices. Although some problems still remain, such as manually adding PIDs for all new AMBA DT based devices. The series applies on 6.5-rc1. Changes in V6: - Rebased on 6.5-rc1 Changes in V5: https://lore.kernel.org/all/20230529062511.52016-1-anshuman.khandual@arm.co… - Updated the comment for apb clock in drvdata structure - Updated conditional check in etm4_runtime_suspend/resume() - Asserted that the APB clock is present and also enabled Changes in V4: https://lore.kernel.org/all/20230523044553.1525048-1-anshuman.khandual@arm.… - Changed in-code comment in etm4_check_arch_features() - Re-ordered pm_runtime_disable() in etm4_remove_platform_dev() - Renamed back etm4_match as etm4_sysreg_match - Moved back [PATCH 6/6] as [PATCH 5/6] Changes in V3: https://lore.kernel.org/all/20230519052149.1367814-1-anshuman.khandual@arm.… - Returned from etm4_check_arch_features() for non iomem devices - Renamed ETM_DEVTYPE_ETMv4x_ARCH as CS_DEVTYPE_PE_TRACE - Renamed is_etm4x_devtype() as is_devtype_cpu_trace() - Added a patch to ignore the absence of graph connections Changes in V2: https://lore.kernel.org/all/20230327050537.30861-1-anshuman.khandual@arm.co… - Enables ACPI etm4x device support in the existing platform driver - Dropped last two patches from the series - Dropped redundant 'devarch' checking from is_etm4x_device() - Renamed updated is_etm4x_device() as is_etm4x_devtype() - Fixed arguments in fallback stub for etm4_check_arch_features() - Tagged etm4_dev_pm_ops with etm4_platform_driver - Updated the comment for coresight_get_enable_apb_pclk() helper - Updated the comment for new 'pclk' element in struct etm4_drvdata - Dropped the clock when devm_ioremap_resource() fails - Convert IS_ERR() into a direct pointer check in etm4_remove_platform_dev() - Dropped "arm,coresight-etm4x" compatible property from etm4_match[] Changes in V1: https://lore.kernel.org/all/20230317030501.1811905-1-anshuman.khandual@arm.… Cc: Ganapatrao Kulkarni <gankulkarni(a)os.amperecomputing.com> Cc: Steve Clevenger <scclevenger(a)os.amperecomputing.com> Cc: Rob Herring <robh+dt(a)kernel.org> Cc: Frank Rowand <frowand.list(a)gmail.com> Cc: Russell King (Oracle) <linux(a)armlinux.org.uk> Cc: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> Cc: "Rafael J. Wysocki" <rafael(a)kernel.org> Cc: Len Brown <lenb(a)kernel.org> Cc: Sudeep Holla <sudeep.holla(a)arm.com> Cc: Lorenzo Pieralisi <lpieralisi(a)kernel.org> Cc: Mathieu Poirier <mathieu.poirier(a)linaro.org> Cc: Suzuki K Poulose <suzuki.poulose(a)arm.com> Cc: Mike Leach <mike.leach(a)linaro.org> Cc: Leo Yan <leo.yan(a)linaro.org> Cc: devicetree(a)vger.kernel.org Cc: linux-acpi(a)vger.kernel.org Cc: coresight(a)lists.linaro.org Cc: linux-arm-kernel(a)lists.infradead.org Cc: linux-kernel(a)vger.kernel.org Anshuman Khandual (4): coresight: etm4x: Allocate and device assign 'struct etmv4_drvdata' earlier coresight: etm4x: Drop iomem 'base' argument from etm4_probe() coresight: etm4x: Drop pid argument from etm4_probe() coresight: etm4x: Change etm4_platform_driver driver for MMIO devices Suzuki K Poulose (2): coresight: platform: acpi: Ignore the absence of graph coresight: etm4x: Add ACPI support in platform driver drivers/acpi/acpi_amba.c | 1 - .../coresight/coresight-etm4x-core.c | 118 ++++++++++++++---- drivers/hwtracing/coresight/coresight-etm4x.h | 4 + .../hwtracing/coresight/coresight-platform.c | 6 +- include/linux/coresight.h | 59 +++++++++ 5 files changed, 164 insertions(+), 24 deletions(-) -- 2.25.1

3 years, 1 month

Some questions about using coresight with AutoFDO to optimize the Linux kernel.

by zack.tsai＠mediatek.com

Hi,all [1] Despite not yielding any benefits in the past, it has been shown that utilizing ARM ETM+AutoFDO can optimize the Linux kernel. I am interested in determining if conducting a trial run on my platform would be beneficial. [1] https://lpc.events/event/7/contributions/798/ [2][3] Show an simple examples optimize a program using simpleperf and perf in perf method I would like to build a version of 'perf' with CORESIGHT=1 that supports ETM and can run on my platform(aarch64). OpenCSD/decoder/tests/auto-fdo/autofdo.md at master · Linaro/OpenCSD · GitHub cd linux && PYTHON=python3 && make install ARCH=arm64 CORESIGHT=1 CROSS_COMPILE=aarch64-linux-gnu- LDFLAGS=-static NO_LIBPERF_BUILD=1 NO_LIBELF=1 NO_JVMTI=1 NO_LIBPYTHON=1 NO_LIBTRACEEVENT=1 NO_PERF_READ_VDSO32=1 NO_PERF_READ_VDSOX32=1 EXTRA_CFLAGS=-Wno-error -C tools/perf/ Makefile.config:525: *** Error: No libopencsd library found or the version is not up-to-date. Please install recent libopencsd to build with CORESIGHT=1. Stop. make[1]: *** [Makefile.perf:242: sub-make] Error 2 make: *** [Makefile:113: install] Error 2 make: Leaving directory '/linux/linux/tools/perf' I have already installed libopencsd through apt-get, but I am still unable to locate my library. /usr/include/opencsd How can I fix this problem? Where should I move /usr/include/opencsd to? Thanks Zack

3 years, 1 month

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