CoreSight November 2020

coresight@lists.linaro.org

35 participants
45 discussions

[PATCH] coresight: etm4x: Add config to exclude kernel mode tracing

by Sai Prakash Ranjan

On production systems with ETMs enabled, it is preferred to exclude kernel mode(NS EL1) tracing for security concerns and support only userspace(NS EL0) tracing. So provide an option via kconfig to exclude kernel mode tracing if it is required. This config is disabled by default and would not affect the current configuration which has both kernel and userspace tracing enabled by default. Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan(a)codeaurora.org> --- drivers/hwtracing/coresight/Kconfig | 9 +++++++++ drivers/hwtracing/coresight/coresight-etm4x-core.c | 6 +++++- 2 files changed, 14 insertions(+), 1 deletion(-) diff --git a/drivers/hwtracing/coresight/Kconfig b/drivers/hwtracing/coresight/Kconfig index c1198245461d..52435de8824c 100644 --- a/drivers/hwtracing/coresight/Kconfig +++ b/drivers/hwtracing/coresight/Kconfig @@ -110,6 +110,15 @@ config CORESIGHT_SOURCE_ETM4X To compile this driver as a module, choose M here: the module will be called coresight-etm4x. +config CORESIGHT_ETM4X_EXCL_KERN + bool "Coresight ETM 4.x exclude kernel mode tracing" + depends on CORESIGHT_SOURCE_ETM4X + help + This will exclude kernel mode(NS EL1) tracing if enabled. This option + will be useful to provide more flexible options on production systems + where only userspace(NS EL0) tracing might be preferred for security + reasons. + config CORESIGHT_STM tristate "CoreSight System Trace Macrocell driver" depends on (ARM && !(CPU_32v3 || CPU_32v4 || CPU_32v4T)) || ARM64 diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c index abd706b216ac..7e5669e5cd1f 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c @@ -832,6 +832,9 @@ static u64 etm4_get_ns_access_type(struct etmv4_config *config) { u64 access_type = 0; + if (IS_ENABLED(CONFIG_CORESIGHT_ETM4X_EXCL_KERN)) + config->mode |= ETM_MODE_EXCL_KERN; + /* * EXLEVEL_NS, bits[15:12] * The Exception levels are: @@ -849,7 +852,8 @@ static u64 etm4_get_ns_access_type(struct etmv4_config *config) access_type = ETM_EXLEVEL_NS_HYP; } - if (config->mode & ETM_MODE_EXCL_USER) + if (config->mode & ETM_MODE_EXCL_USER && + !IS_ENABLED(CONFIG_CORESIGHT_ETM4X_EXCL_KERN)) access_type |= ETM_EXLEVEL_NS_APP; return access_type; base-commit: 3477326277451000bc667dfcc4fd0774c039184c -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation

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

[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

OpenCSD version 0.14.4 released.

by Mike Leach

With build fixes and minor bugfixes. See README for details. -- Mike Leach Principal Engineer, ARM Ltd. Manchester Design Centre. UK

4 years

[RFC 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] and the v8.4 Self hosted tracing support series (Jonathan Zhou) [1]. The tree is available 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. Instead TRBE gets checked on each available CPU, when found gets connected with respective ETE source device on the same CPU, after altering its outward connections. ETE TRBE path connection lasts only till the CPU is online. But ETE-TRBE coupling/decoupling method implemented here is not optimal and would be reworked later on. 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. This adds another change where CoreSight sink device needs to be disabled before capturing the trace data for perf in order to avoid race condition with another simultaneous TRBE IRQ handling. This might cause problem with traditional sink devices which can be operated in both sysfs and perf mode. This needs to be addressed correctly. One option would be to move the update_buffer callback into the respective sink devices. e.g, disable(). This series is primarily looking from some early feed back both on proposed design and its implementation. It acknowledges, that it might be incomplete and will have scopes for improvement. Things todo: - Improve ETE-TRBE coupling and decoupling method - Improve TRBE IRQ handling for all possible corner cases - Implement sysfs based trace sessions [0] https://lore.kernel.org/linux-arm-kernel/20201028220945.3826358-1-suzuki.po… [1] https://lore.kernel.org/linux-arm-kernel/1600396210-54196-1-git-send-email-… [2] https://gitlab.arm.com/linux-arm/linux-skp/-/tree/coresight/etm/v8.4-self-h… Anshuman Khandual (6): arm64: Add TRBE definitions coresight: sink: Add TRBE driver coresight: etm-perf: Truncate the perf record if handle has no space coresight: etm-perf: Disable the path before capturing the trace data coresgith: etm-perf: Connect TRBE sink with ETE source dts: bindings: Document device tree binding for Arm TRBE Suzuki K Poulose (5): 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 sysreg support coresight: ete: Detect ETE as one of the supported ETMs .../devicetree/bindings/arm/coresight.txt | 3 + Documentation/devicetree/bindings/arm/trbe.txt | 20 + Documentation/trace/coresight/coresight-trbe.rst | 36 + arch/arm64/include/asm/sysreg.h | 51 ++ drivers/hwtracing/coresight/Kconfig | 11 + drivers/hwtracing/coresight/Makefile | 1 + drivers/hwtracing/coresight/coresight-etm-perf.c | 85 ++- drivers/hwtracing/coresight/coresight-etm-perf.h | 4 + drivers/hwtracing/coresight/coresight-etm4x-core.c | 144 +++- drivers/hwtracing/coresight/coresight-etm4x.h | 64 +- drivers/hwtracing/coresight/coresight-platform.c | 9 +- drivers/hwtracing/coresight/coresight-trbe.c | 768 +++++++++++++++++++++ drivers/hwtracing/coresight/coresight-trbe.h | 525 ++++++++++++++ include/linux/coresight.h | 2 + 14 files changed, 1680 insertions(+), 43 deletions(-) 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

4 years

Issue report: CoreSight snapshot mode testing failure

by Leo Yan

Hi all, [ + CoreSight Mailing List ] On the mainlne kernel with the latest commit 407ab579637c "Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm", the perf cs-etm testing fails. I found the perf cs-etm testing itself has a typo issue and a regression introduced by Perf tool in the recent mainline kernel, so I sent out the two patches for fixing the related issues [1]. Even after applying these two fixings for the testing script, I still observe the etm testing failure with snapshot mode. I manully checked the perf data and confirmed the perf data contains the raw trace data for snapshot (so 'perf script -D' can work well), but it fails to generate any branch samples, so the command 'perf script' will not output any samples. Seems to me, this issue is more likely related with driver or Perf tool's common code change but not the testing itself; Before I proceed to use 'git bisect' to narrow down the snapshot mode failure, if you have any idea for fixing this issue, please let me know. Otherwise, I will dig into this issue and keep posted. Thanks, Leo [1] https://lore.kernel.org/patchwork/patch/1336053/

4 years

[PATCH v5] coresight: etm4x: Modify core-commit of cpu to avoid the overflow of HiSilicon ETM

by Qi Liu

The ETM device can't keep up with the core pipeline when cpu core is at full speed. This may cause overflow within core and its ETM. This is a common phenomenon on ETM devices. On HiSilicon Hip08 platform, a specific feature is added to set core pipeline. So commit rate can be reduced manually to avoid ETM overflow. Signed-off-by: Qi Liu <liuqi115(a)huawei.com> --- Change since v1: - add CONFIG_ETM4X_IMPDEF_FEATURE and CONFIG_ETM4X_IMPDEF_HISILICON to keep specific feature off platforms which don't use it. Change since v2: - remove some unused variable. Change since v3: - use read/write_sysreg_s() to access register. Change since v4: - rename the call back function to a more generic name, and fix some compile warnings. drivers/hwtracing/coresight/Kconfig | 9 +++ drivers/hwtracing/coresight/coresight-etm4x-core.c | 88 ++++++++++++++++++++++ drivers/hwtracing/coresight/coresight-etm4x.h | 8 ++ 3 files changed, 105 insertions(+) diff --git a/drivers/hwtracing/coresight/Kconfig b/drivers/hwtracing/coresight/Kconfig index c119824..1cc3601 100644 --- a/drivers/hwtracing/coresight/Kconfig +++ b/drivers/hwtracing/coresight/Kconfig @@ -110,6 +110,15 @@ config CORESIGHT_SOURCE_ETM4X To compile this driver as a module, choose M here: the module will be called coresight-etm4x. +config ETM4X_IMPDEF_FEATURE + bool "Control overflow impdef support in CoreSight ETM 4.x driver " + depends on CORESIGHT_SOURCE_ETM4X + help + This control provides overflow implement define for CoreSight + ETM 4.x tracer module which could not reduce commit race + automatically, and could avoid overflow within ETM tracer module + and its cpu core. + config CORESIGHT_STM tristate "CoreSight System Trace Macrocell driver" depends on (ARM && !(CPU_32v3 || CPU_32v4 || CPU_32v4T)) || ARM64 diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c index abd706b..fcee27a 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c @@ -3,6 +3,7 @@ * Copyright (c) 2014, The Linux Foundation. All rights reserved. */ +#include <linux/bitops.h> #include <linux/kernel.h> #include <linux/moduleparam.h> #include <linux/init.h> @@ -28,7 +29,9 @@ #include <linux/perf_event.h> #include <linux/pm_runtime.h> #include <linux/property.h> + #include <asm/sections.h> +#include <asm/sysreg.h> #include <asm/local.h> #include <asm/virt.h> @@ -103,6 +106,87 @@ struct etm4_enable_arg { int rc; }; +#ifdef CONFIG_ETM4X_IMPDEF_FEATURE + +#define HISI_HIP08_AMBA_ID 0x000b6d01 +#define ETM4_AMBA_MASK 0xfffff +#define HISI_HIP08_CORE_COMMIT_CLEAR 0x3000 +#define HISI_HIP08_CORE_COMMIT_SHIFT 12 +#define HISI_HIP08_CORE_COMMIT_REG sys_reg(3, 1, 15, 2, 5) + +struct etm4_arch_features { + void (*arch_callback)(bool enable); +}; + +static bool etm4_hisi_match_pid(unsigned int id) +{ + return (id & ETM4_AMBA_MASK) == HISI_HIP08_AMBA_ID; +} + +static void etm4_hisi_config_core_commit(bool enable) +{ + u64 val; + + val = read_sysreg_s(HISI_HIP08_CORE_COMMIT_REG); + val &= ~HISI_HIP08_CORE_COMMIT_CLEAR; + val |= enable << HISI_HIP08_CORE_COMMIT_SHIFT; + write_sysreg_s(val, HISI_HIP08_CORE_COMMIT_REG); +} + +static struct etm4_arch_features etm4_features[] = { + [ETM4_IMPDEF_HISI_CORE_COMMIT] = { + .arch_callback = etm4_hisi_config_core_commit, + }, + {}, +}; + +static void etm4_enable_arch_specific(struct etmv4_drvdata *drvdata) +{ + struct etm4_arch_features *ftr; + int bit; + + for_each_set_bit(bit, drvdata->arch_features, ETM4_IMPDEF_FEATURE_MAX) { + ftr = &etm4_features[bit]; + + if (ftr->arch_callback) + ftr->arch_callback(true); + } +} + +static void etm4_disable_arch_specific(struct etmv4_drvdata *drvdata) +{ + struct etm4_arch_features *ftr; + int bit; + + for_each_set_bit(bit, drvdata->arch_features, ETM4_IMPDEF_FEATURE_MAX) { + ftr = &etm4_features[bit]; + + if (ftr->arch_callback) + ftr->arch_callback(false); + } +} + +static void etm4_check_arch_features(struct etmv4_drvdata *drvdata, + unsigned int id) +{ + if (etm4_hisi_match_pid(id)) + set_bit(ETM4_IMPDEF_HISI_CORE_COMMIT, drvdata->arch_features); +} +#else +static void etm4_enable_arch_specific(struct etmv4_drvdata *drvdata) +{ +} + +static void etm4_disable_arch_specific(struct etmv4_drvdata *drvdata) +{ +} + +static void etm4_check_arch_features(struct etmv4_drvdata *drvdata, + unsigned int id) +{ +} +#endif /* CONFIG_ETM4X_IMPDEF_FEATURE */ + static int etm4_enable_hw(struct etmv4_drvdata *drvdata) { int i, rc; @@ -110,6 +194,7 @@ static int etm4_enable_hw(struct etmv4_drvdata *drvdata) struct device *etm_dev = &drvdata->csdev->dev; CS_UNLOCK(drvdata->base); + etm4_enable_arch_specific(drvdata); etm4_os_unlock(drvdata); @@ -476,6 +561,7 @@ static void etm4_disable_hw(void *info) int i; CS_UNLOCK(drvdata->base); + etm4_disable_arch_specific(drvdata); if (!drvdata->skip_power_up) { /* power can be removed from the trace unit now */ @@ -1547,6 +1633,8 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id) drvdata->boot_enable = true; } + etm4_check_arch_features(drvdata, id->id); + return 0; } diff --git a/drivers/hwtracing/coresight/coresight-etm4x.h b/drivers/hwtracing/coresight/coresight-etm4x.h index eefc737..3dd3e06 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x.h +++ b/drivers/hwtracing/coresight/coresight-etm4x.h @@ -8,6 +8,7 @@ #include <asm/local.h> #include <linux/spinlock.h> +#include <linux/types.h> #include "coresight-priv.h" /* @@ -203,6 +204,11 @@ /* Interpretation of resource numbers change at ETM v4.3 architecture */ #define ETM4X_ARCH_4V3 0x43 +enum etm_impdef_type { + ETM4_IMPDEF_HISI_CORE_COMMIT, + ETM4_IMPDEF_FEATURE_MAX, +}; + /** * struct etmv4_config - configuration information related to an ETMv4 * @mode: Controls various modes supported by this ETM. @@ -415,6 +421,7 @@ struct etmv4_save_state { * @state_needs_restore: True when there is context to restore after PM exit * @skip_power_up: Indicates if an implementation can skip powering up * the trace unit. + * @arch_features: Bitmap of arch features of etmv4 devices. */ struct etmv4_drvdata { void __iomem *base; @@ -463,6 +470,7 @@ struct etmv4_drvdata { struct etmv4_save_state *save_state; bool state_needs_restore; bool skip_power_up; + DECLARE_BITMAP(arch_features, ETM4_IMPDEF_FEATURE_MAX); }; /* Address comparator access types */ -- 2.8.1

4 years

[PATCH v4 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. The changes also switch to using the system instructions by default even when we may have an MMIO. 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. [0] https://developer.arm.com/docs/ddi0601/g/aarch64-system-registers/trcidr1 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. 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. Jonathan Zhou (2): arm64: Add TRFCR_ELx definitions coresight: Add support for v8.4 SelfHosted tracing Suzuki K Poulose (23): 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 trcidr coresight: etm4x: Add necessary synchronization for sysreg access coresight: etm4x: Detect system instructions support coresight: etm4x: Refactor probing routine coresight: etm4x: Add support for sysreg only devices dts: bindings: coresight: ETM system register access only units .../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 | 771 +++++++++++------- .../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 | 227 +++++- 18 files changed, 1386 insertions(+), 428 deletions(-) -- 2.24.1

4 years

[PATCH] coresight: tmc-etr: Fix barrier packet insertion for perf buffer

by Suzuki K Poulose

When the ETR is used in perf mode with a larger buffer (configured via sysfs or the default size of 1M) than the perf aux buffer size, we end up inserting the barrier packet at the wrong offset, while moving the offset forward. i.e, instead of the "new moved offset", we insert it at the current hardware buffer offset. These packets will not be visible as they are never copied and could lead to corruption in the trace decoding side, as the decoder is not aware that it needs to reset the decoding. Fixes: ec13c78d7b45 ("coresight: tmc-etr: Add barrier packets when moving offset forward") Reported-by: Al Grant <al.grant(a)arm.com> Tested-by: Mike Leach <mike.leach(a)arm.com> Cc: Mathieu Poirier <mathieu.poirier(a)linaro.org> Signed-off-by: Suzuki K Poulose <suzuki.poulose(a)arm.com> --- drivers/hwtracing/coresight/coresight-tmc-etr.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c index a31a4d7ae25e..bf5230e39c5b 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-etr.c +++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c @@ -1552,7 +1552,7 @@ tmc_update_etr_buffer(struct coresight_device *csdev, /* Insert barrier packets at the beginning, if there was an overflow */ if (lost) - tmc_etr_buf_insert_barrier_packet(etr_buf, etr_buf->offset); + tmc_etr_buf_insert_barrier_packet(etr_buf, offset); tmc_etr_sync_perf_buffer(etr_perf, offset, size); /* -- 2.24.1

4 years

[PATCH] coresight: etm4x: Modify core-commit of cpu to avoid the overflow of HiSilicon ETM

by Qi Liu

The ETM device can't keep up with the core pipeline when cpu core is at full speed. This may cause overflow within core and its ETM. This is a common phenomenon on ETM devices. On HiSilicon Hip08 platform, a specific feature is added to set core pipeline. So commit rate can be reduced manually to avoid ETM overflow. Signed-off-by: Qi Liu <liuqi115(a)huawei.com> --- Change since v1: - add CONFIG_ETM4X_IMPDEF_FEATURE and CONFIG_ETM4X_IMPDEF_HISILICON to keep specific feature off platforms which don't use it. Change since v2: - remove some unused variable. Change since v3: - use read/write_sysreg_s() to access register. drivers/hwtracing/coresight/Kconfig | 9 +++ drivers/hwtracing/coresight/coresight-etm4x-core.c | 84 ++++++++++++++++++++++ drivers/hwtracing/coresight/coresight-etm4x.h | 12 ++++ 3 files changed, 105 insertions(+) diff --git a/drivers/hwtracing/coresight/Kconfig b/drivers/hwtracing/coresight/Kconfig index c119824..1cc3601 100644 --- a/drivers/hwtracing/coresight/Kconfig +++ b/drivers/hwtracing/coresight/Kconfig @@ -110,6 +110,15 @@ config CORESIGHT_SOURCE_ETM4X To compile this driver as a module, choose M here: the module will be called coresight-etm4x. +config ETM4X_IMPDEF_FEATURE + bool "Control overflow impdef support in CoreSight ETM 4.x driver " + depends on CORESIGHT_SOURCE_ETM4X + help + This control provides overflow implement define for CoreSight + ETM 4.x tracer module which could not reduce commit race + automatically, and could avoid overflow within ETM tracer module + and its cpu core. + config CORESIGHT_STM tristate "CoreSight System Trace Macrocell driver" depends on (ARM && !(CPU_32v3 || CPU_32v4 || CPU_32v4T)) || ARM64 diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c index abd706b..a1cf215 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c @@ -3,6 +3,7 @@ * Copyright (c) 2014, The Linux Foundation. All rights reserved. */ +#include <linux/bitops.h> #include <linux/kernel.h> #include <linux/moduleparam.h> #include <linux/init.h> @@ -28,7 +29,9 @@ #include <linux/perf_event.h> #include <linux/pm_runtime.h> #include <linux/property.h> + #include <asm/sections.h> +#include <asm/sysreg.h> #include <asm/local.h> #include <asm/virt.h> @@ -103,6 +106,83 @@ struct etm4_enable_arg { int rc; }; +#ifdef CONFIG_ETM4X_IMPDEF_FEATURE + +#define HISI_HIP08_AMBA_ID 0x000b6d01 +#define ETM4_AMBA_MASK 0xfffff +#define HISI_HIP08_CORE_COMMIT_CLEAR 0x3000 +#define HISI_HIP08_CORE_COMMIT_SHIFT 12 +#define HISI_HIP08_CORE_COMMIT_REG sys_reg(3, 1, 15, 2, 5) + +bool etm4_hisi_match_pid(unsigned int id) +{ + return (id & ETM4_AMBA_MASK) == HISI_HIP08_AMBA_ID; +} + +static void etm4_hisi_config_core_commit(bool enable) +{ + u64 val; + + val = read_sysreg_s(HISI_HIP08_CORE_COMMIT_REG); + val &= ~HISI_HIP08_CORE_COMMIT_CLEAR; + val |= enable << HISI_HIP08_CORE_COMMIT_SHIFT; + write_sysreg_s(val, HISI_HIP08_CORE_COMMIT_REG); +} + +static struct etm4_arch_features etm4_features[] = { + [ETM4_IMPDEF_HISI_CORE_COMMIT] = { + .set_commit = etm4_hisi_config_core_commit, + }, + {}, +}; + +static void etm4_enable_arch_specific(struct etmv4_drvdata *drvdata) +{ + struct etm4_arch_features *ftr; + int bit; + + for_each_set_bit(bit, drvdata->arch_features, ETM4_IMPDEF_FEATURE_MAX) { + ftr = &etm4_features[bit]; + + if (ftr->set_commit) + ftr->set_commit(true); + } +} + +static void etm4_disable_arch_specific(struct etmv4_drvdata *drvdata) +{ + struct etm4_arch_features *ftr; + int bit; + + for_each_set_bit(bit, drvdata->arch_features, ETM4_IMPDEF_FEATURE_MAX) { + ftr = &etm4_features[bit]; + + if (ftr->set_commit) + ftr->set_commit(false); + } +} + +static void etm4x_check_arch_features(struct etmv4_drvdata *drvdata, + unsigned int id) +{ + if (etm4_hisi_match_pid(id)) + set_bit(ETM4_IMPDEF_HISI_CORE_COMMIT, drvdata->arch_features); +} +#else +static void etm4_enable_arch_specific(struct etmv4_drvdata *drvdata) +{ +} + +static void etm4_disable_arch_specific(struct etmv4_drvdata *drvdata) +{ +} + +static void etm4_check_arch_features(struct etmv4_drvdata drvdata, + unsigned int id) +{ +} +#endif /* CONFIG_ETM4X_IMPDEF_FEATURE */ + static int etm4_enable_hw(struct etmv4_drvdata *drvdata) { int i, rc; @@ -110,6 +190,7 @@ static int etm4_enable_hw(struct etmv4_drvdata *drvdata) struct device *etm_dev = &drvdata->csdev->dev; CS_UNLOCK(drvdata->base); + etm4_enable_arch_specific(drvdata); etm4_os_unlock(drvdata); @@ -476,6 +557,7 @@ static void etm4_disable_hw(void *info) int i; CS_UNLOCK(drvdata->base); + etm4_disable_arch_specific(drvdata); if (!drvdata->skip_power_up) { /* power can be removed from the trace unit now */ @@ -1547,6 +1629,8 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id) drvdata->boot_enable = true; } + etm4x_check_arch_features(drvdata, id->id); + return 0; } diff --git a/drivers/hwtracing/coresight/coresight-etm4x.h b/drivers/hwtracing/coresight/coresight-etm4x.h index eefc737..1784975 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x.h +++ b/drivers/hwtracing/coresight/coresight-etm4x.h @@ -8,6 +8,7 @@ #include <asm/local.h> #include <linux/spinlock.h> +#include <linux/types.h> #include "coresight-priv.h" /* @@ -203,6 +204,11 @@ /* Interpretation of resource numbers change at ETM v4.3 architecture */ #define ETM4X_ARCH_4V3 0x43 +enum etm_impdef_type { + ETM4_IMPDEF_HISI_CORE_COMMIT, + ETM4_IMPDEF_FEATURE_MAX, +}; + /** * struct etmv4_config - configuration information related to an ETMv4 * @mode: Controls various modes supported by this ETM. @@ -415,6 +421,7 @@ struct etmv4_save_state { * @state_needs_restore: True when there is context to restore after PM exit * @skip_power_up: Indicates if an implementation can skip powering up * the trace unit. + * @arch_features: Bitmap of arch features of etmv4 devices. */ struct etmv4_drvdata { void __iomem *base; @@ -463,6 +470,11 @@ struct etmv4_drvdata { struct etmv4_save_state *save_state; bool state_needs_restore; bool skip_power_up; + DECLARE_BITMAP(arch_features, ETM4_IMPDEF_FEATURE_MAX); +}; + +struct etm4_arch_features { + void (*set_commit)(bool enable); }; /* Address comparator access types */ -- 2.8.1

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CoreSight November 2020