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[68.147.0.187]) by smtp.gmail.com with ESMTPSA id 20sm589884pfh.15.2021.07.26.09.49.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 26 Jul 2021 09:49:28 -0700 (PDT) Date: Mon, 26 Jul 2021 10:49:26 -0600 From: Mathieu Poirier To: Mike Leach Cc: Branislav Rankov , Alexander Shishkin , Greg Kroah-Hartman , Coresight ML , Linux Kernel Mailing List , linux-arm-kernel Subject: Re: [PATCH v8 00/10] CoreSight configuration management; ETM strobing Message-ID: <20210726164926.GA2646102@p14s> References: <20210707133003.5414-1-mike.leach@linaro.org> <20210712164413.GA1777012@p14s> <20210721174417.GB2377909@p14s> <20210722161736.GA2443981@p14s> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210726_094934_536077_EDEB6EFD X-CRM114-Status: GOOD ( 78.11 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: 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[68.147.0.187]) by smtp.gmail.com with ESMTPSA id 20sm589884pfh.15.2021.07.26.09.49.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 26 Jul 2021 09:49:28 -0700 (PDT) Date: Mon, 26 Jul 2021 10:49:26 -0600 From: Mathieu Poirier To: Mike Leach Cc: Branislav Rankov , Alexander Shishkin , Greg Kroah-Hartman , Coresight ML , Linux Kernel Mailing List , linux-arm-kernel Subject: Re: [PATCH v8 00/10] CoreSight configuration management; ETM strobing Message-ID: <20210726164926.GA2646102@p14s> References: <20210707133003.5414-1-mike.leach@linaro.org> <20210712164413.GA1777012@p14s> <20210721174417.GB2377909@p14s> <20210722161736.GA2443981@p14s> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Jul 23, 2021 at 03:43:52PM +0100, Mike Leach wrote: > HI Mathieu, > > On Thu, 22 Jul 2021 at 17:17, Mathieu Poirier > wrote: > > > > On Wed, Jul 21, 2021 at 10:35:00PM +0100, Mike Leach wrote: > > > HI Mathieu, > > > > > > On Wed, 21 Jul 2021 at 18:44, Mathieu Poirier > > > wrote: > > > > > > > > On Fri, Jul 16, 2021 at 11:25:47AM +0100, Mike Leach wrote: > > > > > HI Mathieu, > > > > > > > > > > Below my change notes for the patches changed between v7 and v8 in this set. > > > > > > > > > > Regards > > > > > > > > > > Mike > > > > > > > > > > 0001, 0003, 0004, 0006, 0007, 0008, 0010 - no change > > > > > > > > > > 0002 - > > > > > coresight-syscfg.c > > > > > top of file - mutex declaration removed. > > > > > cscfg_add_csdev_cfg() > > > > > Spinlock replaces mutex > > > > > cscfg_load_feat_csdev() > > > > > Spinlock replaces mutex > > > > > cscsg_list_add_csdev() > > > > > Init spinlock > > > > > coresight.h > > > > > struct coresight_device {} > > > > > Add spinlock cscfg_csdev_lock alongside the csdev feature and > > > > > config lists that it protects. > > > > > > > > > > 0005 - > > > > > coresight-syscfg.c > > > > > cscfg_csdev_reset_feats() > > > > > Spinlock replaces mutex. > > > > > > > > > > cscfg_csdev_enable_active_config() > > > > > Spinlock replaces mutex. In enable flag to avoid race with disable. > > > > > cscfg_csdev_disable_active_config() > > > > > Spinlock replaces mutex. In enable flag to avoid race with enable. > > > > > > > > > > > > > I'm good with the changes made to the above two patches. > > > > > > > > > > > > > > coresight.h > > > > > struct coresight_device {} > > > > > In enable flag introduced to control possible race between > > > > > enable and disable. E.g. if we are enabling a config, but a power > > > > > event tries to shut down the CPU/ETM causing a disable call. We don’t > > > > > want to hold the cscfg_csdev_lock spinlock throughout the entire > > > > > enable process - especially as the programming call will claim the > > > > > internal driver spinlock when writing internal driver data, but we > > > > > need to ensure that if there is a condition that permits a disable > > > > > call out of normal sequence then we are able to see it and handle it. > > > > > > > > > > > > > Here I'm assuming the enable and disable calls you are referring to are > > > > cscfg_csdev_enable_active_config() and cscfg_csdev_disable_active_config(). > > > > > > > > > > Yes. > > > > > > > From the above paragraph I understand that a call to cscfg_csdev_enable_config() > > > > can be interrupted at any time when the CPU is shutting down, which can only > > > > happen when operating from sysfs. > > > > > > > > > > I was concerned about possible power management issues too - though > > > thinking about it we shouldn't be powering down a PE if we are about > > > to start tracing on it! > > > > You are correct if we are operating from the perf interface. In sysfs you get > > no guarantees, anything can happen. > > > > > > > > Truth is, I split the spinlock claims in > > > cscfg_csdev_enable_active_config() to follow the general kernel > > > guidance to hold them for the minimum amount of time needed, and then > > > could not convince myself that it was impossible for > > > cscfg_csdev_disable_active_config() to be called part way through. > > > > > > > With the above in mind and looking at the implementation in patch 05, if the > > > > code gets interrupted right after cscfg_csdev_enable_config(), function > > > > cscfg_csdev_disable_config() in cscfg_csdev_disable_active_config() won't be > > > > called. > > > > > > > > In function cscfg_csdev_enable_active_config(), could it be possible to set > > > > csdev->active_cscfg_ctxt instead of csdev->cscfg_in_enable? If > > > > cscfg_csdev_enable_config() gets interrupted then function > > > > cscfg_csdev_disable_config() can be called. At that point disabling a feature > > > > that hasn't been enabled shouldn't do anything. > > > > > > > > > > The concern is that the disable functionality is responsible for > > > copying back values that might have changed during the operation of > > > the config - e.g. counters in strobing are restarted at the value they > > > last had if the routine is restarted on the same ETM at a later time > > > in the perf session. So if the enable never occurred / errored - we > > > want to avoid copying what would be an unknown value back. So the > > > safest way is to only copy back if we succeeded in setting in the > > > first place - even ETM was never actually started. > > > > > > Currently we only set csdev->active_cscfg_ctxt after the call to do > > > the actual register programming (call to cscfg_csdev_enable_config()) > > > has succeeded, which was fine using the mutex, but gives us the > > > problem with the split spinlocks. > > > So csdev->cscfg_in_enable prevents disable path from copying back an > > > potentially invalid value. > > > > I see the problem about potentially copying back invalid alues. I suggest to: > > > > 1) use spin_lock_irqsave() in cscfg_set_on_enable() and cscfg_save_on_disable(), > > that way the critical section in there is never preempted. > > > > Agreed. > > > > 2) introduce cscfg_feature_csdev::enabled to keep track of which feature has > > been enabled, and set that flag when the lock is held in cscfg_set_on_enable(). > > > > This does no solve the key issue which is that the configuration - > which can consist of multiple features - must be all programmed to be > correctly enabled. Having per feature enables complicates matters more > than is needed. Knowing which feature has been enabled would allow us to set active_cscfg_ctxt while the lock is held in cscfg_csdev_enable_active_config() and unwind everything in cscfg_csdev_disable_active_config() without fear of copying uninitialised values. > There is currently an enable flag on cscfg_config_csdev - which can be > brought into the scope of the cscfg_csdev_enable_active_config() / > cscfg_csdev_disable_active_config() spinlocks > to do what is needed. > > I've dropped the In_enable flag, and use cscfg_config_csdev::enabled & > csdev->active_cscfg_ctxt to ensure the ordering is handled correctly. > Ok, I'll take a look. > Regards > > Mike > > > Hopefully that will work. A generous helping of comments will also go a long > > way. > > > > > > > > Regards > > > > > > Mike > > > > > > > > > > Thanks, > > > > Mathieu > > > > > > > > > 0009 - > > > > > KConfig > > > > > add in dependency on CONFIGFS_FS to eliminate problem highlighted > > > > > by the kernel bot tests. This had configured coresight as Y, but > > > > > configfs as M - meaning link issues for configfs code introduced in > > > > > this set. > > > > > > > > > > On Tue, 13 Jul 2021 at 10:43, Branislav Rankov wrote: > > > > > > > > > > > > Hi Mathieu, > > > > > > > > > > > > On 7/12/21 5:44 PM, Mathieu Poirier wrote: > > > > > > > Good morning Mike, > > > > > > > > > > > > > > On Wed, Jul 07, 2021 at 02:29:53PM +0100, Mike Leach wrote: > > > > > > >> This patchset introduces initial concepts in CoreSight system > > > > > > >> configuration management support. to allow more detailed and complex > > > > > > >> programming to be applied to CoreSight systems during trace capture. > > > > > > >> > > > > > > >> 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/events. These can be selected on the perf command line as follows:- > > > > > > >> > > > > > > >> perf record -e cs_etm// ... > > > > > > >> > > > > > > >> 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 configuration 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 & tested against coresight/next (5.13-rc6 base) > > > > > > >> > > > > > > >> Changes since v7: > > > > > > >> > > > > > > >> Fixed kernel test robot issue - config with CORESIGHT=y & CONFIGFS_FS=m causes > > > > > > >> build error. Altered CORESIGHT config to select CONFIGFS_FS. > > > > > > >> Reported-by: kernel test robot > > > > > > >> > > > > > > >> Replaced mutex use to protect loaded config lists in coresight devices with per > > > > > > >> device spinlock to remove issue when disable called in interrupt context. > > > > > > >> Reported-by: Branislav Rankov > > > > > > >> > > > > > > > > > > > > > > Can you indicate which patches have changed so I don't have to review the whole > > > > > > > thing again? It is also common practice to remove the RB tag when patches > > > > > > > have changed enough to mandate another review. In this case all patches still > > > > > > > bare my RB tags. > > > > > > > > > > > > > > Branislav reported the problem but he is not a recipient. I would like to have > > > > > > > a confirmation from him that this set fixes the problem he observed before I > > > > > > > start looking at it. > > > > > > > > > > > > I have tested this series and the issue I reported is fixed. > > > > > > > > > > > > > > Thanks, > > > > > > > Mathieu > > > > > > > > > > > > > >> > > > > > > >> Changes since v6: > > > > > > >> Fixed kernel test robot issues- > > > > > > >> Reported-by: kernel test robot > > > > > > >> > > > > > > >> Changes since v5: > > > > > > >> > > > > > > >> 1) Fix code style issues from auto-build reports, as > > > > > > >> Reported-by: kernel test robot > > > > > > >> 2) Update comments to get consistent docs for API functions. > > > > > > >> 3) remove unused #define from autofdo example. > > > > > > >> 4) fix perf code style issues from patch 4 (Mathieu) > > > > > > >> 5) fix configfs code style issues from patch 9. (Mathieu) > > > > > > >> > > > > > > >> Changes since v4: (based on comments from Matthieu and Suzuki). > > > > > > >> No large functional changes - primarily code improvements and naming schema. > > > > > > >> 1) Updated entire set to ensure a consistent naming scheme was used for > > > > > > >> variables and struct members that refer to the key objects in the system. > > > > > > >> Suffixes _desc used for all references to feature and configuraion descriptors, > > > > > > >> suffix _csdev used for all references to load feature and configs in the csdev > > > > > > >> instances. (Mathieu & Suzuki). > > > > > > >> 2) Dropped the 'configurations' sub dir in cs_etm perf directories as superfluous > > > > > > >> with the configfs containing the same information. (Mathieu). > > > > > > >> 3) Simplified perf handling code (suzuki) > > > > > > >> 4) Multiple simplifications and improvements for code readability (Matthieu > > > > > > >> and Suzuki) > > > > > > >> > > > > > > >> Changes since v3: (Primarily based on comments from Matthieu) > > > > > > >> 1) Locking mechanisms simplified. > > > > > > >> 2) Removed the possibility to enable features independently from > > > > > > >> configurations.Only configurations can be enabled now. Simplifies programming > > > > > > >> logic. > > > > > > >> 3) Configuration now uses an activate->enable mechanism. This means that perf > > > > > > >> will activate a selected configuration at the start of a session (during > > > > > > >> setup_aux), and disable at the end of a session (around free_aux) > > > > > > >> The active configuration and associated features will be programmed into the > > > > > > >> CoreSight device instances when they are enabled. This locks the configuration > > > > > > >> into the system while in use. Parameters cannot be altered while this is > > > > > > >> in place. This mechanism will be extended in future for dynamic load / unload > > > > > > >> of configurations to prevent removal while in use. > > > > > > >> 4) Removed the custom bus / driver as un-necessary. A single device is > > > > > > >> registered to own perf fs elements and configfs. > > > > > > >> 5) Various other minor issues addressed. > > > > > > >> > > > > > > >> 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 (10): > > > > > > >> 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: syscfg: Add API to activate and enable configurations > > > > > > >> coresight: etm-perf: Update to activate selected configuration > > > > > > >> coresight: etm4x: Add complex configuration handlers to etmv4 > > > > > > >> coresight: config: Add preloaded configurations > > > > > > >> coresight: syscfg: Add initial configfs support > > > > > > >> Documentation: coresight: Add documentation for CoreSight config > > > > > > >> > > > > > > >> .../trace/coresight/coresight-config.rst | 244 ++++++ > > > > > > >> Documentation/trace/coresight/coresight.rst | 16 + > > > > > > >> drivers/hwtracing/coresight/Kconfig | 1 + > > > > > > >> drivers/hwtracing/coresight/Makefile | 7 +- > > > > > > >> .../hwtracing/coresight/coresight-cfg-afdo.c | 153 ++++ > > > > > > >> .../coresight/coresight-cfg-preload.c | 31 + > > > > > > >> .../coresight/coresight-cfg-preload.h | 13 + > > > > > > >> .../hwtracing/coresight/coresight-config.c | 275 ++++++ > > > > > > >> .../hwtracing/coresight/coresight-config.h | 253 ++++++ > > > > > > >> drivers/hwtracing/coresight/coresight-core.c | 12 +- > > > > > > >> .../hwtracing/coresight/coresight-etm-perf.c | 150 +++- > > > > > > >> .../hwtracing/coresight/coresight-etm-perf.h | 12 +- > > > > > > >> .../hwtracing/coresight/coresight-etm4x-cfg.c | 182 ++++ > > > > > > >> .../hwtracing/coresight/coresight-etm4x-cfg.h | 30 + > > > > > > >> .../coresight/coresight-etm4x-core.c | 38 +- > > > > > > >> .../coresight/coresight-etm4x-sysfs.c | 3 + > > > > > > >> .../coresight/coresight-syscfg-configfs.c | 396 +++++++++ > > > > > > >> .../coresight/coresight-syscfg-configfs.h | 45 + > > > > > > >> .../hwtracing/coresight/coresight-syscfg.c | 829 ++++++++++++++++++ > > > > > > >> .../hwtracing/coresight/coresight-syscfg.h | 81 ++ > > > > > > >> include/linux/coresight.h | 11 + > > > > > > >> 21 files changed, 2746 insertions(+), 36 deletions(-) > > > > > > >> create mode 100644 Documentation/trace/coresight/coresight-config.rst > > > > > > >> create mode 100644 drivers/hwtracing/coresight/coresight-cfg-afdo.c > > > > > > >> create mode 100644 drivers/hwtracing/coresight/coresight-cfg-preload.c > > > > > > >> create mode 100644 drivers/hwtracing/coresight/coresight-cfg-preload.h > > > > > > >> 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 > > > > > > >> > > > > > > > _______________________________________________ > > > > > > > CoreSight mailing list > > > > > > > CoreSight@lists.linaro.org > > > > > > > https://lists.linaro.org/mailman/listinfo/coresight > > > > > > > > > > > > > > > > > > > > > > > > > > > -- > > > > > Mike Leach > > > > > Principal Engineer, ARM Ltd. > > > > > Manchester Design Centre. UK > > > > > > > > > > > > -- > > > Mike Leach > > > Principal Engineer, ARM Ltd. > > > Manchester Design Centre. UK > > > > -- > Mike Leach > Principal Engineer, ARM Ltd. > Manchester Design Centre. UK