CoreSight

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Re: [PATCH v2] coresight-etm4x: add isb() before reading the TRCSTATR

by Yuanfang Zhang

On 12/4/2024 11:16 PM, Leo Yan wrote: > Hi Yuanfang, > > Recently I just acrossed this part, so some comments. > > On Wed, Dec 04, 2024 at 07:23:32PM +0800, yuanfang zhang wrote: >> >> From: Yuanfang Zhang <quic_yuanfang(a)quicinc.com> >> >> As recommended by section 4.3.7 ("Synchronization when using system >> instructions to progrom the trace unit") of ARM IHI 0064H.b, the >> self-hosted trace analyzer must perform a Context synchronization >> event between writing to the TRCPRGCTLR and reading the TRCSTATR. >> >> Fixes: ebddaad09e10 ("coresight: etm4x: Add missing single-shot control API to sysfs") >> Signed-off-by: Yuanfang Zhang <quic_yuanfang(a)quicinc.com> >> --- >> Change in V2: >> Added comments in the code. >> drivers/hwtracing/coresight/coresight-etm4x-core.c | 7 +++++++ >> 1 file changed, 7 insertions(+) >> >> diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c >> index 66d44a404ad0..decb3a87e27e 100644 >> --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c >> +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c >> @@ -906,6 +906,13 @@ static void etm4_disable_hw(void *info) >> tsb_csync(); >> etm4x_relaxed_write32(csa, control, TRCPRGCTLR); >> >> + /* >> + * As recommended by section 4.3.7 ("Synchronization when using system >> + * instructions to progrom the trace unit") of ARM IHI 0064H.b, the >> + * self-hosted trace analyzer must perform a Context synchronization >> + * event between writing to the TRCPRGCTLR and reading the TRCSTATR. >> + */ >> + isb(); > > As described in the doc, the "isb" is only required for system > instructions case. It is good to only apply the ISB on system > register case: > > if (!csa->io_mem) > isb(); > updated in PATCH V3. >> /* wait for TRCSTATR.PMSTABLE to go to '1' */ >> if (coresight_timeout(csa, TRCSTATR, TRCSTATR_PMSTABLE_BIT, 1)) >> dev_err(etm_dev, > > As mentioned in system register case: "Arm recommends that the > self-hosted trace analyzer always executes an ISB instruction after > programming the trace unit registers, to ensure that all updates are > committed to the trace unit before normal code execution resumes." > > And for MMIO case: > > "When the memory is marked as Device-nGnRE or stronger. > ... > - Poll TRCSTATR to ensure the previous write has completed. > — Execute an ISB operation." > > Thus we need to add an ISB after polling. > > isb(); > updated in PATCH V3. > For consistent behaviour, a relevant thing is the dsb(sy) in > etm4_enable_hw(). I do not think the dsb(sy) is necessary, as the > driver uses the sequence "write TRCPRGCTLR + polling TRCSTATR" to > ensure the data has been populated to trace unit, the polling > operations somehow act as a read back. And the ETM manual does not > mention the requirement for DSB when enabling trace unit. Thus, we > should remove dsb(sy) (maybe use a separte patch). > updated in PATCH V3. > Mike / Suzuki / James, please confirm if my conclusions are valid. > > Thanks, > Leo

6 months, 1 week

[PATCH v12 0/8] Coresight for Kernel panic and watchdog reset

by Linu Cherian

This patch series is rebased on coresight-next-v6.12.rc4 * Patches 1 & 2 adds support for allocation of trace buffer pages from reserved RAM * Patches 3 & 4 adds support for saving metadata at the time of kernel panic * Patch 5 adds support for reading trace data captured at the time of panic * Patches 6 & 7 adds support for disabling coresight blocks at the time of panic * Patch 8: Gives the full description about this feature as part of documentation V11 is posted here, https://lore.kernel.org/linux-arm-kernel/20241111124746.2210378-1-lcherian@… Changelog from v11: Convert all commands to literal code blocks, that was missed out in v11. No other code changes. Changelog from v10: * Converted all csdev_access_* to readl functions in tmc_panic_sync_* * Added "tmc" prefix for register snapshots in struct tmc_crash_metadata * Converted dev_info to dev_dbg in panic handlers * Converted dsb to dmb in panic handlers * Fixed marking metadata as invalid when a user is trying to use the reserved buffer. Earlier this was wrongly set at the time of reading reserved trace buffer. * Moved common validation checks to is_tmc_crashdata_valid and minor code rearrangements for efficiency * Got rid of sink specific prepare/unprepare invocations * Got rid of full from struct tmc_resrv_buf * While reading crashdata, size is now calculated from metdata instead of relying on reserved buffer size populated by dtb * Minor documenation fixes Changelog from v9: * Add common helper function of_tmc_get_reserved_resource_by_name for better code reuse * Reserved buffer validity and crashdata validity has been separated to avoid interdependence * New fields added to crash metadata: version, ffcr, ffsr, mode * Version checks added for metadata validation * Special file /dev/crash_tmc_xxx would be available only when crash metadata is valid * Removed READ_CRASHDATA mode meant for special casing crashdata reads. Instead, dedicated read function added for crashdata reads from reserved buffer which is common for both ETR and ETF sinks as well. * Documentation added to Documentation/tracing/coresight/panic.rst Changelog from v8: * Added missing exit path on error in __tmc_probe. * Few whitespace fixes, checkpatch fixes. * With perf sessions honouring stop_on_flush sysfs attribute, removed redundant variable stop_on_flush_en. Changelog from v7: * Fixed breakage on perf test -vvvv "arm coresight". No issues seen with and without "resrv" buffer mode * Moved the crashdev registration into a separate function. * Removed redundant variable in tmc_etr_setup_crashdata_buf * Avoided a redundant memcpy in tmc_panic_sync_etf. * Tested kernel panic with trace session started uisng perf. Please see the title "Perf based testing" below for details. For this, stop_on_flush sysfs attribute is taken into consideration while starting perf sessions as well. Changelog from v6: * Added special device files for reading crashdata, so that read_prevboot mode flag is removed. * Added new sysfs TMC device attribute, stop_on_flush. Stop on flush trigger event is disabled by default. User need to explicitly enable this from sysfs for panic stop to work. * Address parameter for panicstop ETM configuration is chosen as kernel "panic" address by default. * Added missing tmc_wait_for_tmcready during panic handling * Few other misc code rearrangements. Changelog from v5: * Fixed issues reported by CONFIG_DEBUG_ATOMIC_SLEEP * Fixed a memory leak while reading data from /dev/tmc_etrx in READ_PREVBOOT mode * Tested reading trace data from crashdump kernel Changelog from v4: * Device tree binding - Description is made more explicit on the usage of reserved memory region - Mismatch in memory region names in dts binding and driver fixed - Removed "mem" suffix from the memory region names * Rename "struct tmc_register_snapshot" -> "struct tmc_crash_metadata", since it contains more than register snapshot. Related variables are named accordingly. * Rename struct tmc_drvdata members resrv_buf -> crash_tbuf metadata -> crash_mdata * Size field in metadata refers to RSZ register and hence indicates the size in 32 bit words. ETR metadata follows this convention, the same has been extended to ETF metadata as well. * Added crc32 for more robust metadata and tracedata validation. * Added/modified dev_dbg messages during metadata validation * Fixed a typo in patch 5 commit description Changelog from v3: * Converted the Coresight ETM driver change to a named configuration. RFC tag has been removed with this change. * Fixed yaml issues reported by "make dt_binding_check" * Added names for reserved memory regions 0 and 1 * Added prevalidation checks for metadata processing * Fixed a regression introduced in RFC v3 - TMC Status register was getting saved wrongly * Reverted memremap attribute changes from _WB to _WC to match with the dma map attributes * Introduced reserved buffer mode specific .sync op. This fixes a possible crash when reserved buffer mode was used in normal trace capture, due to unwanted dma maintenance operations. Linu Cherian (8): dt-bindings: arm: coresight-tmc: Add "memory-region" property coresight: tmc-etr: Add support to use reserved trace memory coresight: core: Add provision for panic callbacks coresight: tmc: Enable panic sync handling coresight: tmc: Add support for reading crash data coresight: tmc: Stop trace capture on FlIn coresight: config: Add preloaded configuration Documentation: coresight: Panic support .../bindings/arm/arm,coresight-tmc.yaml | 26 ++ Documentation/trace/coresight/panic.rst | 362 ++++++++++++++++++ drivers/hwtracing/coresight/Makefile | 2 +- .../coresight/coresight-cfg-preload.c | 2 + .../coresight/coresight-cfg-preload.h | 2 + .../hwtracing/coresight/coresight-cfg-pstop.c | 83 ++++ drivers/hwtracing/coresight/coresight-core.c | 42 ++ .../hwtracing/coresight/coresight-tmc-core.c | 326 +++++++++++++++- .../hwtracing/coresight/coresight-tmc-etf.c | 92 ++++- .../hwtracing/coresight/coresight-tmc-etr.c | 181 ++++++++- drivers/hwtracing/coresight/coresight-tmc.h | 104 +++++ include/linux/coresight.h | 12 + 12 files changed, 1222 insertions(+), 12 deletions(-) create mode 100644 Documentation/trace/coresight/panic.rst create mode 100644 drivers/hwtracing/coresight/coresight-cfg-pstop.c -- 2.34.1

6 months, 1 week

Re: [PATCH v5 0/2] coresight: Add label sysfs node support

by Jinlong Mao

On 2024/12/11 16:46, Krzysztof Kozlowski wrote: > On Tue, Dec 10, 2024 at 08:22:51PM +0800, Mao Jinlong wrote: >> With current design, the name of the non-cpu bounded coresight >> component is the device type with the number. And with 'ls' command >> we can get the register address of the component. But from these >> information, we can't know what the HW or system the component belongs >> to. Add label in DT and show the hw information by reading label sysfs >> node. >> >> cti_sys0 -> ../../../devices/platform/soc(a)0/138f0000.cti/cti_sys0 >> cti_sys1 -> ../../../devices/platform/soc(a)0/13900000.cti/cti_sys1 >> tpdm0 -> ../../../devices/platform/soc(a)0/10b0d000.tpdm/tpdm0 >> tpdm1 -> ../../../devices/platform/soc(a)0/10c28000.tpdm/tpdm1 >> tpdm2 -> ../../../devices/platform/soc(a)0/10c29000.tpdm/tpdm2 >> >> /sys/bus/coresight/devices # cat cti*/label >> cti_dlct_0 >> cti_dlct_1 >> cti_apss_0 >> cti_apss_1 >> cti_apss_2 >> >> Change since V4: >> 1. Add label in DT and add label sysfs node for each coresight device. > > This is v5, no links to previous versions (I really suggest to start > using b4 if you want to make your process easier for you), no other > changes so subject is obviously the same and looking for this patchset > previous versions gives me 0 results: > > https://lore.kernel.org/all/?q=%22coresight%3A+Add+label+sysfs+node+support… > > OK, let's try b4 diff: > > b4 diff '20241210122253.31926-1-quic_jinlmao(a)quicinc.com' > Grabbing thread from lore.kernel.org/all/20241210122253.31926-1-quic_jinlmao@quicinc.com/t.mbox.… > Checking for older revisions > Grabbing search results from lore.kernel.org > Nothing matching that query. > --- > Analyzing 3 messages in the thread > Could not find lower series to compare against. > > > So how do you expect us to do any meaningful review? > > Best regards, > Krzysztof I will resend the patches with the links of lower series. >

6 months, 1 week

Re: [PATCH] coresight: Fix dsb_mode_store() unsigned val is never less than zero

by Suzuki K Poulose

On Thu, 21 Nov 2024 10:40:03 +0800, Pei Xiao wrote: > dsb_mode_store() warn: unsigned 'val' is never less than zero. > > Applied, thanks! [1/1] coresight: Fix dsb_mode_store() unsigned val is never less than zero https://git.kernel.org/coresight/c/d4276259f3a57131291d879b53fc05863c6b59fa Best regards, -- Suzuki K Poulose <suzuki.poulose(a)arm.com>

6 months, 1 week

[PATCH v7 0/3] coresight: Add static trace id support

by Mao Jinlong

Some HW has static trace id which cannot be changed via software programming. For this case, configure the trace id in device tree with "arm,static-trace-id = <xxx>", and call coresight_trace_id_get_static_system_id with the trace id value in device probe function. The id will be reserved for the HW all the time if the device is probed. Changes since V6: 1. Add code to handle a case where the preferred_id is not valid when use static id. 2. Returen busy when static id is not freed. Changes since V5: 1. Remove the warn for staic id not available. 2. Drop the system_id if registering the coresight device fails. 3. Return busy when static id is not available in dummy driver. Changes since V4: 1. Use fwnode_property_read_u32 in fwnode_property_read_u32. 2. Update date and version in sysfs-bus-coresight-devices-dummy-source Changes since V3: 1. Adda new API function int coresight_trace_id_get_system_static_id(int trace_id). 2. Use the term "static trace id" for these devices where the hardware sets a non-programmable trace ID. Changes since V2: 1. Change "trace-id" to "arm,trace-id". 2. Add trace id flag for getting preferred id or ODD id. Changes since V1: 1. Add argument to coresight_trace_id_get_system_id for preferred id instead of adding new function coresight_trace_id_reserve_system_id. 2. Add constraint to trace-id in dt-binding file. Mao Jinlong (3): dt-bindings: arm: Add arm,static-trace-id for coresight dummy source coresight: Add support to get static id for system trace sources coresight: dummy: Add static trace id support for dummy source .../sysfs-bus-coresight-devices-dummy-source | 15 ++++ .../arm/arm,coresight-dummy-source.yaml | 6 ++ drivers/hwtracing/coresight/coresight-dummy.c | 81 ++++++++++++++++--- .../hwtracing/coresight/coresight-platform.c | 6 ++ .../hwtracing/coresight/coresight-trace-id.c | 43 +++++++--- .../hwtracing/coresight/coresight-trace-id.h | 9 +++ include/linux/coresight.h | 1 + 7 files changed, 140 insertions(+), 21 deletions(-) create mode 100644 Documentation/ABI/testing/sysfs-bus-coresight-devices-dummy-source -- 2.17.1

6 months, 1 week

[PATCH] coresight: Drop atomics in connection refcounts

by James Clark

These belong to the device being enabled or disabled and are only ever used inside the device's spinlock. Remove the atomics to not imply that there are any other concurrent accesses. If atomics were necessary I don't think they would have been enough anyway. There would be nothing to prevent an enable or disable running concurrently if not for the spinlock. Signed-off-by: James Clark <james.clark(a)linaro.org> --- drivers/hwtracing/coresight/coresight-funnel.c | 6 +++--- drivers/hwtracing/coresight/coresight-replicator.c | 6 +++--- drivers/hwtracing/coresight/coresight-tpda.c | 6 +++--- include/linux/coresight.h | 4 ++-- 4 files changed, 11 insertions(+), 11 deletions(-) diff --git a/drivers/hwtracing/coresight/coresight-funnel.c b/drivers/hwtracing/coresight/coresight-funnel.c index 5a819c8970fb..bd32f74cbdae 100644 --- a/drivers/hwtracing/coresight/coresight-funnel.c +++ b/drivers/hwtracing/coresight/coresight-funnel.c @@ -86,14 +86,14 @@ static int funnel_enable(struct coresight_device *csdev, bool first_enable = false; spin_lock_irqsave(&drvdata->spinlock, flags); - if (atomic_read(&in->dest_refcnt) == 0) { + if (in->dest_refcnt == 0) { if (drvdata->base) rc = dynamic_funnel_enable_hw(drvdata, in->dest_port); if (!rc) first_enable = true; } if (!rc) - atomic_inc(&in->dest_refcnt); + in->dest_refcnt++; spin_unlock_irqrestore(&drvdata->spinlock, flags); if (first_enable) @@ -130,7 +130,7 @@ static void funnel_disable(struct coresight_device *csdev, bool last_disable = false; spin_lock_irqsave(&drvdata->spinlock, flags); - if (atomic_dec_return(&in->dest_refcnt) == 0) { + if (--in->dest_refcnt == 0) { if (drvdata->base) dynamic_funnel_disable_hw(drvdata, in->dest_port); last_disable = true; diff --git a/drivers/hwtracing/coresight/coresight-replicator.c b/drivers/hwtracing/coresight/coresight-replicator.c index 3e55be9c8418..31322aea19f2 100644 --- a/drivers/hwtracing/coresight/coresight-replicator.c +++ b/drivers/hwtracing/coresight/coresight-replicator.c @@ -126,7 +126,7 @@ static int replicator_enable(struct coresight_device *csdev, bool first_enable = false; spin_lock_irqsave(&drvdata->spinlock, flags); - if (atomic_read(&out->src_refcnt) == 0) { + if (out->src_refcnt == 0) { if (drvdata->base) rc = dynamic_replicator_enable(drvdata, in->dest_port, out->src_port); @@ -134,7 +134,7 @@ static int replicator_enable(struct coresight_device *csdev, first_enable = true; } if (!rc) - atomic_inc(&out->src_refcnt); + out->src_refcnt++; spin_unlock_irqrestore(&drvdata->spinlock, flags); if (first_enable) @@ -180,7 +180,7 @@ static void replicator_disable(struct coresight_device *csdev, bool last_disable = false; spin_lock_irqsave(&drvdata->spinlock, flags); - if (atomic_dec_return(&out->src_refcnt) == 0) { + if (--out->src_refcnt == 0) { if (drvdata->base) dynamic_replicator_disable(drvdata, in->dest_port, out->src_port); diff --git a/drivers/hwtracing/coresight/coresight-tpda.c b/drivers/hwtracing/coresight/coresight-tpda.c index bfca103f9f84..4ec676bea1ce 100644 --- a/drivers/hwtracing/coresight/coresight-tpda.c +++ b/drivers/hwtracing/coresight/coresight-tpda.c @@ -190,10 +190,10 @@ static int tpda_enable(struct coresight_device *csdev, int ret = 0; spin_lock(&drvdata->spinlock); - if (atomic_read(&in->dest_refcnt) == 0) { + if (in->dest_refcnt == 0) { ret = __tpda_enable(drvdata, in->dest_port); if (!ret) { - atomic_inc(&in->dest_refcnt); + in->dest_refcnt++; csdev->refcnt++; dev_dbg(drvdata->dev, "TPDA inport %d enabled.\n", in->dest_port); } @@ -223,7 +223,7 @@ static void tpda_disable(struct coresight_device *csdev, struct tpda_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); spin_lock(&drvdata->spinlock); - if (atomic_dec_return(&in->dest_refcnt) == 0) { + if (--in->dest_refcnt == 0) { __tpda_disable(drvdata, in->dest_port); csdev->refcnt--; } diff --git a/include/linux/coresight.h b/include/linux/coresight.h index c13342594278..834029cb9ba2 100644 --- a/include/linux/coresight.h +++ b/include/linux/coresight.h @@ -200,8 +200,8 @@ struct coresight_connection { struct coresight_device *dest_dev; struct coresight_sysfs_link *link; struct coresight_device *src_dev; - atomic_t src_refcnt; - atomic_t dest_refcnt; + int src_refcnt; + int dest_refcnt; }; /** -- 2.34.1

6 months, 1 week

[PATCH v5 0/2] coresight: Add label sysfs node support

by Mao Jinlong

With current design, the name of the non-cpu bounded coresight component is the device type with the number. And with 'ls' command we can get the register address of the component. But from these information, we can't know what the HW or system the component belongs to. Add label in DT and show the hw information by reading label sysfs node. cti_sys0 -> ../../../devices/platform/soc(a)0/138f0000.cti/cti_sys0 cti_sys1 -> ../../../devices/platform/soc(a)0/13900000.cti/cti_sys1 tpdm0 -> ../../../devices/platform/soc(a)0/10b0d000.tpdm/tpdm0 tpdm1 -> ../../../devices/platform/soc(a)0/10c28000.tpdm/tpdm1 tpdm2 -> ../../../devices/platform/soc(a)0/10c29000.tpdm/tpdm2 /sys/bus/coresight/devices # cat cti*/label cti_dlct_0 cti_dlct_1 cti_apss_0 cti_apss_1 cti_apss_2 Change since V4: 1. Add label in DT and add label sysfs node for each coresight device. Change since V3: 1. Change device-name to arm,cs-dev-name. 2. Add arm,cs-dev-name to only CTI and sources' dt-binding. Change since V2: 1. Fix the error in coresight core. drivers/hwtracing/coresight/coresight-core.c:1775:7: error: assigning to 'char *' from 'const char *' discards qualifiers 2. Fix the warning when run dtbinding check. Documentation/devicetree/bindings/arm/arm,coresight-cpu-debug.yaml: device-name: missing type definition Change since V1: 1. Change coresight-name to device name. 2. Add the device-name in coresight dt bindings. Mao Jinlong (2): dt-bindings: arm: Add label in the coresight components coresight: Add label sysfs node support .../testing/sysfs-bus-coresight-devices-cti | 6 ++++ .../sysfs-bus-coresight-devices-funnel | 6 ++++ .../testing/sysfs-bus-coresight-devices-tpdm | 6 ++++ .../bindings/arm/arm,coresight-cti.yaml | 6 ++++ .../arm/arm,coresight-dummy-sink.yaml | 6 ++++ .../arm/arm,coresight-dummy-source.yaml | 6 ++++ .../arm/arm,coresight-dynamic-funnel.yaml | 6 ++++ .../arm/arm,coresight-dynamic-replicator.yaml | 6 ++++ .../arm/arm,coresight-static-funnel.yaml | 6 ++++ .../arm/arm,coresight-static-replicator.yaml | 6 ++++ .../bindings/arm/arm,coresight-tmc.yaml | 6 ++++ .../bindings/arm/qcom,coresight-tpda.yaml | 6 ++++ .../bindings/arm/qcom,coresight-tpdm.yaml | 6 ++++ drivers/hwtracing/coresight/coresight-sysfs.c | 32 +++++++++++++++++++ 14 files changed, 110 insertions(+) -- 2.17.1

6 months, 1 week

[PATCH v6 0/4] source filtering for multi-port output

by Tao Zhang

In our hardware design, by combining a funnel and a replicator, it implement a hardware device with one-to-one correspondence between output ports and input ports. The programming usage on this device is the same as funnel. The software uses a funnel and a static replicator to implement the driver of this device. Since original funnels only support a single output connection and original replicator only support a single input connection, the code needs to be modified to support this new feature. The following is a typical topology diagram of multi-port output mechanism. |----------| |---------| |----------| |---------| | TPDM 0 | | Source0 | | Source 1 | | TPDM 1 | |----------| |---------| |----------| |---------| | | | | | | | | | --------- | | | | | | | | | | | | | | | \-------------/ ---------------------- | \ Funnel 0 / | | ----------- | ------------------------------ | | | | | | \------------------/ \ Funnel 1 / ----| \--------------/ | | |----> Combine a funnel and a | | static replicator /-----------------\ | / replicator 0 \ ----| /---------------------\ | | | | | |-----------| | |---------| | | |TPDM0 |TPDM1 | \-----------------/ | \ TPDA 0 / | \-------------/ | | | | |Source0/1 | \-------------------------------/ \ Funnel 2 / \---------------------------/ Changes in V6: 1. Optimize the prompt content of the warning log when the filter handle is not a trace source. -- Suzuki K Poulose 2. Reset the filter device and fwnode if it is not a trace source. -- Suzuki K Poulose Changes in V5: 1. Replace "filter-src" with "filter-source" in the dt-binding document. -- Suzuki K Poulose 2. Optimize the comments of the patch "coresight: Add support for trace filtering by source" due to bad example. -- Suzuki K Poulose 3. Correct spelling errors in the patch "coresight: Add support for trace filtering by source". -- Suzuki K Poulose 4. Optimize the function "coresight_blocks_source". -- Suzuki K Poulose 5. Add { } in the function "of_coresight_parse_endpoint". -- Suzuki K Poulose 6. Adjust the order of the patches. -- Suzuki K Poulose 7. Adjust the alignment in "coresight-platform.c". -- Suzuki K Poulose Changes in V4: 1. Use "coresight_get_source(path)" in the function "coresight_disable_path_from" instead of explicitly passing the source. -- Suzuki K Poulose 2. Optimize the order of the input parameters for "_coresight_build_path". -- Suzuki K Poulose 3. Reuse the method "coresight_block_source" in "_coresight_build_path". -- Suzuki K Poulose 4. Remove the unnecessary () in "coresight_build_path". -- Suzuki K Poulose 5. Add a helper to check if a device is SOURCE. -- Suzuki K Poulose 6. Adjust the posistion of setting "still_orphan" in "coresight_build_path". -- Suzuki K Poulose Changes in V3: 1. Rename the function "coresight_source_filter" to "coresight_block_source". And refine this function. -- Suzuki K Poulose 2. Rename the parameters of the function "coresight_find_out_connection" to avoid confusion. -- Suzuki K Poulose 3. Get the source of path in "coresight_enable_path" and "coresight_disable_path". -- Suzuki K Poulose 4. Fix filter source device before skip the port in "coresight_orphan_match". -- Suzuki K Poulose 5. Make sure the device still orphan if whter is a filter source firmware node but the filter source device is null. -- Suzuki K Poulose 6. Walk through the entire coresight bus and fixup the "filter_src_dev" if the source is being removed. -- Suzuki K Poulose 7. Refine the commit description of patch#2. -- Suzuki K Poulose 8. Fix the warning reported by kernel test robot. -- kernel test robot. 9. Use the source device directly if the port has a hardcoded filter in "tpda_get_element_size". -- Suzuki K Poulose Changes in V2: 1. Change the reference for endpoint property in dt-binding. -- Krzysztof Kozlowski 2. Change the property name "filter_src" to "filter-src". -- Krzysztof Kozlowski 3. Fix the errors in running 'make dt_binding_check'. -- Rob Herring 4. Pass in the source parameter instead of path. -- Suzuki K Poulose 5. Reset the "filter_src_dev" if the "src" csdev is being removed. -- Suzuki K Poulose 6. Add a warning if the "filter_src_dev" is of not the type DEV_TYPE_SOURCE. -- Suzuki K Poulose 7. Optimize the procedure for handling all possible cases. -- Suzuki K Poulose Changes in V1: 1. Add a static replicator connect to a funnel to implement the correspondence between the output ports and the input ports on funnels. -- Suzuki K Poulose 2. Add filter_src_dev and filter_src_dev phandle to "coresight_connection" struct, and populate them if there is one. -- Suzuki K Poulose 3. To look at the phandle and then fixup/remove the filter_src device in fixup/remove connections. -- Suzuki K Poulose 4. When TPDA reads DSB/CMB element size, it is implemented by looking up filter src device in the connections. -- Suzuki K Poulose Tao Zhang (4): dt-bindings: arm: qcom,coresight-static-replicator: Add property for source filtering coresight: Add a helper to check if a device is source coresight: Add support for trace filtering by source coresight-tpda: Optimize the function of reading element size .../arm/arm,coresight-static-replicator.yaml | 19 ++- drivers/hwtracing/coresight/coresight-core.c | 113 +++++++++++++++--- .../hwtracing/coresight/coresight-platform.c | 21 ++++ drivers/hwtracing/coresight/coresight-tpda.c | 13 +- include/linux/coresight.h | 12 +- 5 files changed, 155 insertions(+), 23 deletions(-) -- 2.17.1

6 months, 2 weeks

Re: [PATCH] selftests: arm coresight: sysfsmode testing

by James Clark

On 04/12/2024 12:23 am, Shuah Khan wrote: > On 11/29/24 01:38, Linu Cherian wrote: >> Add sysfs mode selftest for ARM Coresight hardware tracer. > > Please add details on what this test does in here. Include > the output from the test? > > Does this test have dependencies on config? If it does, does > this test detect and skip if config isn't enabled? > Without the config the test won't find any devices and it will still pass. But yes it would still be good to explicitly mark the dependency. >> >> Signed-off-by: Linu Cherian <lcherian(a)marvell.com> >> --- >> .../drivers/hwtracing/coresight/Makefile | 5 + >> .../hwtracing/coresight/sysfs_test_trace.sh | 144 ++++++++++++++++++ >> 2 files changed, 149 insertions(+) >> create mode 100644 tools/testing/selftests/drivers/hwtracing/ >> coresight/Makefile >> create mode 100755 tools/testing/selftests/drivers/hwtracing/ >> coresight/sysfs_test_trace.sh >> >> diff --git a/tools/testing/selftests/drivers/hwtracing/coresight/ >> Makefile b/tools/testing/selftests/drivers/hwtracing/coresight/Makefile >> new file mode 100644 >> index 000000000000..7dc68ae1c0a9 >> --- /dev/null >> +++ b/tools/testing/selftests/drivers/hwtracing/coresight/Makefile >> @@ -0,0 +1,5 @@ >> +# SPDX-License-Identifier: GPL-2.0 >> + >> +TEST_PROGS = sysfs_test_trace.sh >> + >> +include ../../../lib.mk >> diff --git a/tools/testing/selftests/drivers/hwtracing/coresight/ >> sysfs_test_trace.sh b/tools/testing/selftests/drivers/hwtracing/ >> coresight/sysfs_test_trace.sh >> new file mode 100755 >> index 000000000000..0d6307fff1d2 >> --- /dev/null >> +++ b/tools/testing/selftests/drivers/hwtracing/coresight/ >> sysfs_test_trace.sh >> @@ -0,0 +1,144 @@ >> +#!/bin/sh >> +# SPDX-License-Identifier: GPL-2.0 >> +# Copyright (C) 2024 Marvell. >> + >> +# Test Arm CoreSight trace capture in sysfs mode >> +# Based on tools/perf/tests/shell/test_arm_coresight.sh >> + >> +glb_err=0 >> + >> +arm_cs_report() { >> + if [ $2 != 0 ]; then >> + echo "$1: FAIL" >> + glb_err=$2 >> + else >> + echo "$1: PASS" >> + fi >> +} >> + >> +is_device_sink() { >> + # If the node of "enable_sink" is existed under the device path, >> this >> + # means the device is a sink device. >> + >> + if [ -e "$1/enable_sink" ]; then >> + >> + return 0 >> + else >> + return 1 >> + fi >> +} >> + >> +# Configure sink for buffer mode >> +cfg_sink_buf_mode() { >> + sink_dev=$1 >> + mode=$2 >> + # Set buffer mode if supported >> + if [ -e "$sink_dev/buf_modes_available" ]; then >> + cat $sink_dev/buf_modes_available | grep -E -q $mode >> + if [ $? -eq 0 ]; then >> + echo $mode > $sink_dev/buf_mode_preferred >> + return 0 >> + fi >> + fi >> + >> + return 1 >> +} >> + >> +run_app() { >> + >> + taskset -c $1 dd if=/dev/urandom of=/dev/null bs=1M count=64 >> +} >> + >> +sysfs_trace() { >> + src_dev=$1 >> + sink_dev=$2 >> + cpu=$3 >> + >> + # Enable sink device >> + echo 1 > $sink_dev/enable_sink >> + # Enable source device >> + echo 1 > $src_dev/enable_source >> + >> + # Run app to be traced >> + run_app $cpu >> + >> + # Read back trace data >> + dd if=/dev/$sink_dev_name of=/tmp/tracedata >> + >> + # Verify if read is successful >> + err=$? >> + >> + # Disable source device >> + echo 0 > $src_dev/enable_source >> + >> + # Diskable sink device >> + echo 0 > $sink_dev/enable_sink >> + >> + arm_cs_report "CoreSight path testing (CPU$cpu -> >> $sink_dev_name)" $err >> +} >> + >> +try_sysfs_trace_resrv_buf() { >> + src_dev=$1 >> + sink_dev=$2 >> + cpu=$3 >> + >> + # Configure the resrved buffer mode if available >> + cfg_sink_buf_mode $sink_dev "resrv" >> + if [ $? -eq 0 ]; then >> + echo "Running sysfs trace with resrv buf mode" >> + sysfs_trace $src_dev $sink_dev $cpu >> + # Restore buffer mode >> + cfg_sink_buf_mode $sink_dev "auto" >> + if [ $? -eq 1 ]; then >> + echo "Failed to restore default buf mode" >> + fi >> + fi >> +} >> + >> +arm_cs_iterate_devices() { >> + src_dev=$1 >> + cpu=$3 >> + for cdev in $2/connections/out\:*; do >> + >> + # Skip testing if it's not a directory >> + ! [ -d $cdev ] && continue; >> + >> + # Read out its symbol link file name >> + sink_dev=`readlink -f $cdev` >> + >> + # Extract device name from path, e.g. >> + # sink_dev = '/sys/devices/platform/20010000.etf/tmc_etf0' >> + # `> sink_dev_name = 'tmc_etf0' >> + sink_dev_name=$(basename $sink_dev) >> + >> + if is_device_sink $sink_dev; then >> + # Run trace with resrv buf mode (if available) >> + try_sysfs_trace_resrv_buf $src_dev $sink_dev $cpu >> + >> + # Run the default mode >> + echo "Running sysfs trace with default settings" >> + sysfs_trace $src_dev $sink_dev $cpu >> + fi >> + >> + arm_cs_iterate_devices $src_dev $cdev $cpu >> + >> + done >> +} >> + >> +arm_cs_etm_traverse_path_test() { >> + # Iterate for every ETM device >> + for dev in /sys/bus/event_source/devices/cs_etm/cpu*; do >> + # Canonicalize the path >> + dev=`readlink -f $dev` >> + >> + # Find the ETM device belonging to which CPU >> + cpu=`cat $dev/cpu` >> + >> + # Use depth-first search (DFS) to iterate outputs >> + arm_cs_iterate_devices $dev $dev $cpu >> + done >> +} >> + >> +arm_cs_etm_traverse_path_test >> + >> +exit $glb_err > > thanks, > -- Shuah >

6 months, 2 weeks

Re: [PATCH] coresight-etm4x: add isb() before reading the TRCSTATR

by Suzuki K Poulose

Hi On 04/12/2024 10:13, yuanfang zhang wrote: > From: Yuanfang Zhang <quic_yuanfang(a)quicinc.com> > > As recommended by section 4.3.7 ("Synchronization when using system > instructions to progrom the trace unit") of ARM IHI 0064H.b, the > self-hosted trace analyzer must perform a Context synchronization > event between writing to the TRCPRGCTLR and reading the TRCSTATR. > Thanks for the patch. Please could you add the above in a comment in the changes below ? Also, add Fixes tag ? (It may go all the way back to initial support) Otherwise looks sensible to me. Suzuki > Signed-off-by: Yuanfang Zhang <quic_yuanfang(a)quicinc.com> > --- > drivers/hwtracing/coresight/coresight-etm4x-core.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c > index 66d44a404ad0..5da2c523c30a 100644 > --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c > +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c > @@ -906,6 +906,7 @@ static void etm4_disable_hw(void *info) > tsb_csync(); > etm4x_relaxed_write32(csa, control, TRCPRGCTLR); > > + isb(); > /* wait for TRCSTATR.PMSTABLE to go to '1' */ > if (coresight_timeout(csa, TRCSTATR, TRCSTATR_PMSTABLE_BIT, 1)) > dev_err(etm_dev,

6 months, 2 weeks

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