CoreSight January 2021

coresight@lists.linaro.org

30 participants
39 discussions

[PATCH] coresight: etm-perf: Add support for PID tracing for kernel at EL2

by Suzuki K Poulose

When the kernel is running at EL2, the PID is stored in CONTEXTIDR_EL2. So, tracing CONTEXTIDR_EL1 doesn't give us the pid of the process. Thus we should trace the VMID with VMIDOPT set to trace CONTEXTIDR_EL2 instead of VMID. Given that we have an existing config option "contextid" and this will be useful for tracing virtual machines (when we get to support virtualization). So instead, this patch adds a new option, contextid_in_vmid as a separate config. Thus on an EL2 kernel, we will have two options available for the perf tool. However, to make it easier for the user to do pid tracing, we add a new format which will default to "contextid" (on EL1 kernel) or "contextid_in_vmid" (on EL2 kernel). So that the user doesn't have to bother which EL the kernel is running. i.e, perf record -e cs_etm/pid/u -- will always do the "pid" tracing, independent of the kernel EL. Also, the perf tool will be updated to automatically select "pid" config instead of the "contextid" for system wide/CPU wide mode. Cc: Mathieu Poirier <mathieu.poirier(a)linaro.org> Cc: Al Grant <al.grant(a)arm.com> Cc: Mike Leach <mike.leach(a)linaro.org> Cc: Leo Yan <leo.yan(a)linaro.org> Signed-off-by: Suzuki K Poulose <suzuki.poulose(a)arm.com> --- Changes since previous version: - Fix build break on 32bit kernel (kernel test robot <lkp(a)intel.com>) --- .../hwtracing/coresight/coresight-etm-perf.c | 18 ++++++++++++++++++ .../hwtracing/coresight/coresight-etm4x-core.c | 9 +++++++++ include/linux/coresight-pmu.h | 11 +++++++---- 3 files changed, 34 insertions(+), 4 deletions(-) diff --git a/drivers/hwtracing/coresight/coresight-etm-perf.c b/drivers/hwtracing/coresight/coresight-etm-perf.c index bdc34ca449f7..f13c3a7bbc84 100644 --- a/drivers/hwtracing/coresight/coresight-etm-perf.c +++ b/drivers/hwtracing/coresight/coresight-etm-perf.c @@ -30,14 +30,32 @@ static DEFINE_PER_CPU(struct coresight_device *, csdev_src); /* ETMv3.5/PTM's ETMCR is 'config' */ PMU_FORMAT_ATTR(cycacc, "config:" __stringify(ETM_OPT_CYCACC)); PMU_FORMAT_ATTR(contextid, "config:" __stringify(ETM_OPT_CTXTID)); +PMU_FORMAT_ATTR(contextid_in_vmid, "config:" __stringify(ETM_OPT_CTXTID_IN_VMID)); PMU_FORMAT_ATTR(timestamp, "config:" __stringify(ETM_OPT_TS)); PMU_FORMAT_ATTR(retstack, "config:" __stringify(ETM_OPT_RETSTK)); /* Sink ID - same for all ETMs */ PMU_FORMAT_ATTR(sinkid, "config2:0-31"); +static ssize_t format_attr_pid_show(struct device *dev, + struct device_attribute *attr, + char *page) +{ + int pid_fmt = ETM_OPT_CTXTID; + +#ifdef CONFIG_CORESIGHT_SOURCE_ETM4X + if (is_kernel_in_hyp_mode()) + pid_fmt = ETM_OPT_CTXTID_IN_VMID; +#endif + return sprintf(page, "config:%d\n", pid_fmt); +} + +struct device_attribute format_attr_pid = __ATTR(pid, 0444, format_attr_pid_show, NULL); + static struct attribute *etm_config_formats_attr[] = { &format_attr_cycacc.attr, &format_attr_contextid.attr, + &format_attr_contextid_in_vmid.attr, + &format_attr_pid.attr, &format_attr_timestamp.attr, &format_attr_retstack.attr, &format_attr_sinkid.attr, diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c index b20b6ff17cf6..8b7c7a8b2874 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c @@ -477,6 +477,15 @@ static int etm4_parse_event_config(struct etmv4_drvdata *drvdata, /* bit[6], Context ID tracing bit */ config->cfg |= BIT(ETM4_CFG_BIT_CTXTID); + /* Do not enable VMID tracing if we are not running in EL2 */ + if (attr->config & BIT(ETM_OPT_CTXTID_IN_VMID)) { + if (!is_kernel_in_hyp_mode()) { + ret = -EINVAL; + goto out; + } + config->cfg |= BIT(ETM4_CFG_BIT_VMID) | BIT(ETM4_CFG_BIT_VMID_OPT); + } + /* return stack - enable if selected and supported */ if ((attr->config & BIT(ETM_OPT_RETSTK)) && drvdata->retstack) /* bit[12], Return stack enable bit */ diff --git a/include/linux/coresight-pmu.h b/include/linux/coresight-pmu.h index b0e35eec6499..927c6285ce5d 100644 --- a/include/linux/coresight-pmu.h +++ b/include/linux/coresight-pmu.h @@ -11,16 +11,19 @@ #define CORESIGHT_ETM_PMU_SEED 0x10 /* ETMv3.5/PTM's ETMCR config bit */ -#define ETM_OPT_CYCACC 12 -#define ETM_OPT_CTXTID 14 -#define ETM_OPT_TS 28 -#define ETM_OPT_RETSTK 29 +#define ETM_OPT_CYCACC 12 +#define ETM_OPT_CTXTID 14 +#define ETM_OPT_CTXTID_IN_VMID 15 +#define ETM_OPT_TS 28 +#define ETM_OPT_RETSTK 29 /* ETMv4 CONFIGR programming bits for the ETM OPTs */ #define ETM4_CFG_BIT_CYCACC 4 #define ETM4_CFG_BIT_CTXTID 6 +#define ETM4_CFG_BIT_VMID 7 #define ETM4_CFG_BIT_TS 11 #define ETM4_CFG_BIT_RETSTK 12 +#define ETM4_CFG_BIT_VMID_OPT 15 static inline int coresight_get_trace_id(int cpu) { -- 2.24.1

3 years, 11 months

[PATCH v6 00/26] coresight: etm4x: Support for system instructions

by Suzuki K Poulose

CoreSight ETMv4.4 obsoletes memory mapped access to ETM and mandates the system instructions for registers. This also implies that they may not be on the amba bus. Right now all the CoreSight components are accessed via memory map. Also, we have some common routines in coresight generic code driver (e.g, CS_LOCK, claim/disclaim), which assume the mmio. In order to preserve the generic algorithms at a single place and to allow dynamic switch for ETMs, this series introduces an abstraction layer for accessing a coresight device. It is designed such that the mmio access are fast tracked (i.e, without an indirect function call). This will also help us to get rid of the driver+attribute specific sysfs show/store routines and replace them with a single routine to access a given register offset (which can be embedded in the dev_ext_attribute). This is not currently implemented in the series, but can be achieved. Further we switch the generic routines to work with the abstraction. With this in place, we refactor the etm4x code a bit to allow for supporting the system instructions with very little new code. We use TRCDEVARCH for the detection of the ETM component, which is a standard register as per CoreSight architecture, rather than the etm specific id register TRCIDR1. This is for making sure that we are able to detect the ETM via system instructions accurately, when the the trace unit could be anything (etm or a custom trace unit). To keep the backward compatibility for any existing broken impelementation which may not implement TRCDEVARCH, we fall back to TRCIDR1. Also this covers us for the changes in the future architecture [0]. Also, v8.4 self-hosted tracing extensions (coupled with ETMv4.4) adds new filtering registers for trace by exception level. So on a v8.4 system, with Trace Filtering support, without the appropriate programming of the Trace filter registers (TRFCR_ELx), tracing will not be enabled. This series also includes the TraceFiltering support to cover the ETM-v4.4 support. The series has been mildly tested on a model for system instructions. I would really appreciate any testing on real hardware. Applies on coresight/next. A tree is available here [1]. [0] https://developer.arm.com/docs/ddi0601/g/aarch64-system-registers/trcidr1 [1] https://gitlab.arm.com/linux-arm/linux-skp coresight/etm/sysreg-v6 Changes since v5: - Rebased on to coresight/next. - Moved trcdevarch to mgmt/ in sysfs and updated the sysfs ABI document (Mike Leach) - New patch : Moved the etm4_check_arch_features to run on the CPU, since the PID of the ETM has to be read on the CPU and is unavailable otherwise. Changes since v4: - Fix typo in commit description for the patches 02 & 15 - Refactor the AMBA device "remove" call back for use with paltform_driver. (patch 21). Thus remove Review tag by Mathieu, even though the changes are minimal. - Added "remove" callback for platform_driver in patch 22, removed Review tag by Mathieu - Add 'U' suffix for constants in Patch 24 (Catalin) - Fixed field extraction in Patch 25 Changes since v3: - Device tree compatible changed to etm4x - Use etm4x_** instead of generalizing etm_ in etm4x driver. - Added v8.4 self hosted trace support patches, reworked from Jonathan's series. - Dropped queued patches. - Expose TRCDEVARCH via trcidr, as this will be needed for the userspace tools to determine the trace major/minor arch versions. - Remove csa argument to read()/write() (Mathieu) - Fix secure exception mask calculation (Mathieu) - Fix various coding style comments (Mathieu) (See individual patches for change log) Changes since V2: - Several fixes to the ETM register accesses. Access a register when it is present. - Add support for TRCIDR3.NUMPROCS for v4.2+ - Drop OS lock detection. Use software lock only in case of mmio. - Fix issues with the Exception level masks (Mike Leach) - Fall back to using TRCIDR1 when TRCDEVARCH is not "present" - Use a generic notion of ETM architecture (rather than using the encoding as in registers) - Fixed some checkpatch issues. - Changed the dts compatible string to "arm,coresight-etm-sysreg" (Mike Leach) Changes since V1: - Flip the switch for iomem from no_iomem to io_mem in csdev_access. - Split patches for claim/disclaim and CS_LOCK/UNLOCK conversions. - Move device access initialisation for etm4x to the target CPU - Cleanup secure exception level mask handling. - Switch to use TRCDEVARCH for ETM component discovery. This is for making - Check the availability of OS/Software Locks before using them. Known issues: Checkpatch failure for "coresight: etm4x: Add sysreg access helpers" : ERROR: Macros with complex values should be enclosed in parentheses #121: FILE: drivers/hwtracing/coresight/coresight-etm4x.h:153: +#define CASE_READ(res, x) \ + case (x): { (res) = read_etm4x_sysreg_const_offset((x)); break; } I don't know a way to fix the warning without loosing the code readability, which I believe is crucial for such a construct. Jonathan Zhou (2): arm64: Add TRFCR_ELx definitions coresight: Add support for v8.4 SelfHosted tracing Suzuki K Poulose (24): coresight: etm4x: Handle access to TRCSSPCICRn coresight: etm4x: Skip accessing TRCPDCR in save/restore coresight: Introduce device access abstraction coresight: tpiu: Prepare for using coresight device access abstraction coresight: Convert coresight_timeout to use access abstraction coresight: Convert claim/disclaim operations to use access wrappers coresight: etm4x: Always read the registers on the host CPU coresight: etm4x: Convert all register accesses coresight: etm4x: Add commentary on the registers coresight: etm4x: Add sysreg access helpers coresight: etm4x: Define DEVARCH register fields coresight: etm4x: Check for Software Lock coresight: etm4x: Cleanup secure exception level masks coresight: etm4x: Clean up exception level masks coresight: etm4x: Handle ETM architecture version coresight: etm4x: Detect access early on the target CPU coresight: etm4x: Use TRCDEVARCH for component discovery coresight: etm4x: Expose trcdevarch via sysfs coresight: etm4x: Add necessary synchronization for sysreg access coresight: etm4x: Detect system instructions support coresight: etm4x: Refactor probing routine coresight: etm4x: Run arch feature detection on the CPU coresight: etm4x: Add support for sysreg only devices dts: bindings: coresight: ETM system register access only units .../testing/sysfs-bus-coresight-devices-etm4x | 8 + .../devicetree/bindings/arm/coresight.txt | 5 +- arch/arm64/include/asm/sysreg.h | 11 + drivers/hwtracing/coresight/coresight-catu.c | 12 +- drivers/hwtracing/coresight/coresight-core.c | 122 ++- .../hwtracing/coresight/coresight-cti-core.c | 18 +- drivers/hwtracing/coresight/coresight-etb10.c | 10 +- .../coresight/coresight-etm3x-core.c | 9 +- .../coresight/coresight-etm4x-core.c | 805 ++++++++++++------ .../coresight/coresight-etm4x-sysfs.c | 46 +- drivers/hwtracing/coresight/coresight-etm4x.h | 498 ++++++++++- .../hwtracing/coresight/coresight-funnel.c | 7 +- .../coresight/coresight-replicator.c | 13 +- drivers/hwtracing/coresight/coresight-stm.c | 4 +- .../hwtracing/coresight/coresight-tmc-core.c | 16 +- .../hwtracing/coresight/coresight-tmc-etf.c | 10 +- .../hwtracing/coresight/coresight-tmc-etr.c | 4 +- drivers/hwtracing/coresight/coresight-tpiu.c | 31 +- include/linux/coresight.h | 225 ++++- 19 files changed, 1423 insertions(+), 431 deletions(-) -- 2.24.1

3 years, 11 months

[PATCH 00/11] arm64: coresight: Enable ETE and TRBE

by Anshuman Khandual

This series enables future IP trace features Embedded Trace Extension (ETE) and Trace Buffer Extension (TRBE). This series depends on the ETM system register instruction support series [0] which is available here [1]. This series which applies on [1] is avaialble here [2] for quick access. ETE is the PE (CPU) trace unit for CPUs, implementing future architecture extensions. ETE overlaps with the ETMv4 architecture, with additions to support the newer architecture features and some restrictions on the supported features w.r.t ETMv4. The ETE support is added by extending the ETMv4 driver to recognise the ETE and handle the features as exposed by the TRCIDRx registers. ETE only supports system instructions access from the host CPU. The ETE could be integrated with a TRBE (see below), or with the legacy CoreSight trace bus (e.g, ETRs). Thus the ETE follows same firmware description as the ETMs and requires a node per instance. Trace Buffer Extensions (TRBE) implements a per CPU trace buffer, which is accessible via the system registers and can be combined with the ETE to provide a 1x1 configuration of source & sink. TRBE is being represented here as a CoreSight sink. Primary reason is that the ETE source could work with other traditional CoreSight sink devices. As TRBE captures the trace data which is produced by ETE, it cannot work alone. TRBE representation here have some distinct deviations from a traditional CoreSight sink device. Coresight path between ETE and TRBE are not built during boot looking at respective DT or ACPI entries. Unlike traditional sinks, TRBE can generate interrupts to signal including many other things, buffer got filled. The interrupt is a PPI and should be communicated from the platform. DT or ACPI entry representing TRBE should have the PPI number for a given platform. During perf session, the TRBE IRQ handler should capture trace for perf auxiliary buffer before restarting it back. System registers being used here to configure ETE and TRBE could be referred in the link below. https://developer.arm.com/docs/ddi0601/g/aarch64-system-registers. Things todo: - Improve TRBE IRQ handling for all possible corner cases - Implement sysfs based trace sessions [0] https://lore.kernel.org/linux-arm-kernel/20201214173731.302520-1-suzuki.pou… [1] https://gitlab.arm.com/linux-arm/linux-skp/-/tree/coresight/etm/sysreg-v5 [2] https://gitlab.arm.com/linux-arm/linux-anshuman/-/tree/coresight/ete_trbe_v1 Changes in V1: - There are not much ETE changes from Suzuki apart from splitting of the ETE DTS patch - TRBE changes have been captured in the respective patches Changes in RFC: https://lore.kernel.org/linux-arm-kernel/1605012309-24812-1-git-send-email-… 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: Linu Cherian <lcherian(a)marvell.com> Cc: coresight(a)lists.linaro.org Cc: linux-arm-kernel(a)lists.infradead.org Cc: linux-kernel(a)vger.kernel.org Anshuman Khandual (5): arm64: Add TRBE definitions coresight: core: Add support for dedicated percpu sinks coresight: etm-perf: Truncate the perf record if handle has no space coresight: sink: Add TRBE driver dts: bindings: Document device tree binding for Arm TRBE Suzuki K Poulose (6): coresight: etm-perf: Allow an event to use different sinks coresight: Do not scan for graph if none is present coresight: etm4x: Add support for PE OS lock coresight: ete: Add support for ETE sysreg access coresight: ete: Add support for ETE tracing dts: bindings: Document device tree bindings for ETE Documentation/devicetree/bindings/arm/ete.txt | 41 + Documentation/devicetree/bindings/arm/trbe.txt | 20 + Documentation/trace/coresight/coresight-trbe.rst | 39 + arch/arm64/include/asm/sysreg.h | 51 ++ drivers/hwtracing/coresight/Kconfig | 11 + drivers/hwtracing/coresight/Makefile | 1 + drivers/hwtracing/coresight/coresight-core.c | 14 + drivers/hwtracing/coresight/coresight-etm-perf.c | 51 +- drivers/hwtracing/coresight/coresight-etm4x-core.c | 138 ++- drivers/hwtracing/coresight/coresight-etm4x.h | 64 +- drivers/hwtracing/coresight/coresight-platform.c | 6 + drivers/hwtracing/coresight/coresight-trbe.c | 925 +++++++++++++++++++++ drivers/hwtracing/coresight/coresight-trbe.h | 248 ++++++ include/linux/coresight.h | 12 + 14 files changed, 1580 insertions(+), 41 deletions(-) create mode 100644 Documentation/devicetree/bindings/arm/ete.txt create mode 100644 Documentation/devicetree/bindings/arm/trbe.txt create mode 100644 Documentation/trace/coresight/coresight-trbe.rst create mode 100644 drivers/hwtracing/coresight/coresight-trbe.c create mode 100644 drivers/hwtracing/coresight/coresight-trbe.h -- 2.7.4

3 years, 11 months

Calendario de Cursos Bonificables 2021

by FOESCO

Buenos días Os informamos desde FOESCO (Formación Estatal Continua) que nos encontramos organizando el Calendario de Cursos Bonificables 2021 para empleados en activo o en ERTE. Rogamos respondáis a este mismo correo electrónico eligiendo una de las opciones que a continuación indicamos: 1 - Precisamos información para la PRESENTE convocatoria ENERO 2021 2 - Precisamos información para el mes de .......... (Indicar mes) 3 - No precisamos ninguna información BAJA Quedamos a la espera de vuestra respuesta. Un cordial saludo. Alex Pons. Director FOESCO. FOESCO Formación Estatal Continua e-mail: cursos(a)foesco.net Tel.: 91 032 37 94 (Horario de 9h a 14h y de 16:30h a 21h de Lunes a Viernes) FOESCO ofrece formación a empresas y trabajadores en activo a través de cursos bonificables por la Fundación Estatal para la Formación en el Empleo (antiguo FORCEM) que gestiona las acciones formativas de FORMACIÓN CONTINUA para trabajadores y se rige por la ley 30/2015 de 9 de Septiembre. Antes de imprimir este e-mail piense bien si es necesario hacerlo. Before printing this e-mail please think twice if you really need it. FOESCO Tfno: 910 382 880 Email: cursos(a)foesco.com. La información transmitida en este mensaje está dirigida solamente a las personas o entidades que figuran en el encabezamiento y contiene información confidencial, por lo que, si usted lo recibiera por error, por favor destrúyalo sin copiarlo, usarlo ni distribuirlo, comunicándolo inmediatamente al emisor del mensaje. De conformidad con lo dispuesto en el Reglamento Europeo del 2016/679, del 27 de Abril de 2016, FOESCO le informa que los datos por usted suministrados serán tratados con las medidas de seguridad conformes a la normativa vigente que se requiere. Dichos datos serán empleados con fines de gestión. Para el ejercicio de sus derechos de transparencia, información, acceso, rectificación, supresión o derecho al olvido, limitación del tratamiento , portabilidad de datos y oposición de sus datos de carácter personal deberá dirigirse a la dirección del Responsable del tratamiento a C/ LAGUNA DEL MARQUESADO Nº10, 28021, MADRID, "PULSANDO AQUI" <mailto:bajas@foesco.com?Subject=BAJA%20CORREOS> y "ENVIAR" o a traves de la dirección de correo electrónico: bajas(a)foesco.com <mailto:bajas@foesco.com?Subject=BAJA%20CORREOS>

3 years, 11 months

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3 years, 11 months

[RFC PATCH v3 0/9] CoreSight complex config support; ETM strobing

by Mike Leach

This patchset introduces initial concepts in CoreSight complex system configuration support. Configurations consist of 2 elements:- 1) Features - programming combinations for devices, applied to a class of device on the system (all ETMv4), or individual devices. 2) Configurations - a set of programmed features used when the named configuration is selected. Features and configurations are declared as a data table, a set of register, resource and parameter requirements. Features and configurations are loaded into the system by the virtual cs_syscfg device. This then matches features to any registered devices and loads the feature into them. Individual device classes that support feature and configuration register with cs_syscfg. Once loaded a configuration can be enabled for a specific trace run. Configurations are registered with the perf cs_etm event as entries in cs_etm/cs_config. These can be selected on the perf command line as follows:- perf record -e cs_etm/<config_name>/ ... This patch set has one pre-loaded configuration and feature. A named "strobing" feature is provided for ETMv4. A named "autofdo" configuration is provided. This configuration enables strobing on any ETM in used. Thus the command: perf record -e cs_etm/autofdo/ ... will trace the supplied application while enabling the "autofdo" configuation on each ETM as it is enabled by perf. This in turn will enable strobing for the ETM - with default parameters. Parameters can be adjusted using configfs. The sink used in the trace run will be automatically selected. A configuation can supply up to 15 of preset parameter values, which will subsitute in parameter values for any feature used in the configuration. Selection of preset values as follows perf record -e cs_etm/autofdo,preset=1/ ... (valid presets 1-N, where N is the number supplied in the configuration, not exceeding 15. preset=0 is the same as not selecting a preset.) Applies to coresight/next (5.10-rc1 base) Changes since v2: 1) Added documentation file. 2) Altered cs_syscfg driver to no longer be coresight_device based, and moved to its own custom bus to remove it from the main coresight bus. (Mathieu) 3) Added configfs support to inspect and control loaded configurations and features. Allows listing of preset values (Yabin Cui) 4) Dropped sysfs support for adjusting feature parameters on the per device basis, in favour of a single point adjustment in configfs that is pushed to all device instances. 5) Altered how the config and preset command line options are handled in perf and the drivers. (Mathieu and Suzuki). 6) Fixes for various issues and technical points (Mathieu, Yabin) Changes since v1: 1) Moved preloaded configurations and features out of individual drivers. 2) Added cs_syscfg driver to manage configurations and features. Individual drivers register with cs_syscfg indicating support for config, and provide matching information that the system uses to load features into the drivers. This allows individual drivers to be updated on an as needed basis - and removes the need to consider devices that cannot benefit from configuration - static replicators, funnels, tpiu. 3) Added perf selection of configuarations. 4) Rebased onto the coresight module loading set. To follow in future revisions / sets:- a) load of additional config and features by loadable module. b) load of additional config and features by configfs c) enhanced resource management for ETMv4 and checking features have sufficient resources to be enabled. d) ECT and CTI support for configuration and features. Mike Leach (9): coresight: syscfg: Initial coresight system configuration coresight: syscfg: Add registration and feature loading for cs devices coresight: config: Add configuration and feature generic functions coresight: etm-perf: update to handle configuration selection coresight: etm4x: Add complex configuration handlers to etmv4 coresight: config: Add preloaded configurations coresight: syscfg: Add initial configfs support. coresight: syscfg: Allow update of feature params from configfs coresight: docs: Add documentation for CoreSight config. .../trace/coresight/coresight-config.rst | 230 ++++++ Documentation/trace/coresight/coresight.rst | 16 + drivers/hwtracing/coresight/Makefile | 6 +- .../coresight/coresight-cfg-preload.c | 160 +++++ .../hwtracing/coresight/coresight-config.c | 392 +++++++++++ .../hwtracing/coresight/coresight-config.h | 311 +++++++++ drivers/hwtracing/coresight/coresight-core.c | 18 +- .../hwtracing/coresight/coresight-etm-perf.c | 166 ++++- .../hwtracing/coresight/coresight-etm-perf.h | 10 +- .../hwtracing/coresight/coresight-etm4x-cfg.c | 181 +++++ .../hwtracing/coresight/coresight-etm4x-cfg.h | 29 + .../coresight/coresight-etm4x-core.c | 36 +- .../coresight/coresight-etm4x-sysfs.c | 3 + .../coresight/coresight-syscfg-configfs.c | 421 +++++++++++ .../coresight/coresight-syscfg-configfs.h | 47 ++ .../hwtracing/coresight/coresight-syscfg.c | 656 ++++++++++++++++++ .../hwtracing/coresight/coresight-syscfg.h | 83 +++ include/linux/coresight.h | 7 + 18 files changed, 2743 insertions(+), 29 deletions(-) create mode 100644 Documentation/trace/coresight/coresight-config.rst create mode 100644 drivers/hwtracing/coresight/coresight-cfg-preload.c create mode 100644 drivers/hwtracing/coresight/coresight-config.c create mode 100644 drivers/hwtracing/coresight/coresight-config.h create mode 100644 drivers/hwtracing/coresight/coresight-etm4x-cfg.c create mode 100644 drivers/hwtracing/coresight/coresight-etm4x-cfg.h create mode 100644 drivers/hwtracing/coresight/coresight-syscfg-configfs.c create mode 100644 drivers/hwtracing/coresight/coresight-syscfg-configfs.h create mode 100644 drivers/hwtracing/coresight/coresight-syscfg.c create mode 100644 drivers/hwtracing/coresight/coresight-syscfg.h -- 2.17.1

3 years, 11 months

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3 years, 11 months

[PATCH 0/3] coresight: etm-perf: Fix pid tracing with VHE

by Suzuki K Poulose

With the Virtualization Host Extensions, the kernel can run at EL2. In this case the pid is written to CONTEXTIDR_EL2 instead of the CONTEXTIDR_EL1. Thus the normal coresight tracing will be unable to detect the PID of the thread generating the trace by looking at the CONTEXTIDR_EL1. Thus, depending on the kernel EL, we must switch to tracing the correct CONTEXTIDR register. With VHE, we must set the TRCCONFIGR.VMID and TRCCONFIGR.VMID_OPT to include the CONTEXTIDR_EL2 as the VMID in the trace. This requires the perf tool to detect the changes in the TRCCONFIGR and use the VMID / CID field for the PID. The challenge here is for the perf tool to detect the kernel behavior. Instead of the previously proposed invasive approaches, this set implements a less intrusive mechanism, by playing with the perf_event.attribute.config bits. Some facts: - The perf tool requests pid tracing and timestamp in some scenarios. (e.g, system wide, task bound (!per-thread). - The default pid tracing is via requesting "contextid" But this only works for EL1 kernel. - "contextid" tracing is useful for tracing VMs (when we get to virtualization support). So we don't want to move this around. So this patch series introduces two new format bits: - contextid_in_vmid -> Is only supported when the VMID tracing and CONTEXTIDR_EL2 both are supported. When requested the perf etm4x backend sets (TRCCONFIGR.VMID | TRCCONFIGR.VMID_OPT). As per ETMv4.4 TRM, when the core supports VHE, the CONTEXTIDR_EL2 tracing is mandatory. (See the field TRCID2.VMIDOPT) - pid -> Is an alias for the correct config to enable PID tracing on any kernel. i.e, in EL1 kernel -> pid == contextid EL2 kernel -> pid == contextid_in_vmid With this, the perf tool is also updated to request the "pid" tracing whenever available, falling back to "contextid" if it is unavailable (to support new tool running on older kernels). The perf tool will also set the TRCCONFIGR accordingly based on the config bits, allowing the decoder to output the appropriate fields. I have another patch for the perf decoder to set the TID from VMID when the cid is invalid and and the vmid is valid. But this doesn't verify if the trcconfigr.vmid_opt was set. I will leave this to Mike Leach to fix it properly. Tested on Juno (EL1 kernel) and N1SDP (El2 kernel). Feedback welcome. A tree with these patches are available here : git.gitlab.arm.com:linux-arm/linux-skp.git coresight/el2/pid Suzuki K Poulose (3): coresight: etm-perf: Add support for PID tracing for kernel at EL2 perf: cs_etm: Use pid tracing explicitly instead of contextid rfc: perf: cs_etm: Detect pid in VMID for kernel running at EL2 .../hwtracing/coresight/coresight-etm-perf.c | 14 ++++ .../coresight/coresight-etm4x-core.c | 9 +++ include/linux/coresight-pmu.h | 11 ++-- tools/include/linux/coresight-pmu.h | 11 ++-- tools/perf/arch/arm/util/cs-etm.c | 65 ++++++++++++++----- .../perf/util/cs-etm-decoder/cs-etm-decoder.c | 28 ++++---- 6 files changed, 101 insertions(+), 37 deletions(-) -- 2.24.1

3 years, 11 months

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3 years, 11 months

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CoreSight January 2021