CoreSight

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Re: [PATCH v10 4/7] Coresight: Introduce a new struct coresight_path

by James Clark

On 14/02/2025 1:34 am, Jie Gan wrote: > > > On 2/14/2025 12:00 AM, James Clark wrote: >> >> >> On 07/02/2025 6:42 am, Jie Gan wrote: >>> Add 'struct coresight_path' to store the data that is needed by >>> coresight_enable_path/coresight_disable_path. The structure will be >>> transmitted to any required devices to enable related funcationalities. >>> >>> The trace_id will be allocated after the path is built. Consequently, >>> The ETM3x and ETM4x devices will directly read the trace_id from path >>> which result in etm_read_alloc_trace_id and etm4_read_alloc_trace_id >>> being deleted. >>> >>> Co-developed-by: James Clark <james.clark(a)linaro.org> >>> Signed-off-by: James Clark <james.clark(a)linaro.org> >>> Signed-off-by: Jie Gan <quic_jiegan(a)quicinc.com> >>> --- >>> drivers/hwtracing/coresight/coresight-core.c | 106 +++++++++++++----- >>> drivers/hwtracing/coresight/coresight-dummy.c | 5 +- >>> .../hwtracing/coresight/coresight-etm-perf.c | 30 +++-- >>> .../hwtracing/coresight/coresight-etm-perf.h | 2 +- >>> drivers/hwtracing/coresight/coresight-etm.h | 1 - >>> .../coresight/coresight-etm3x-core.c | 54 ++------- >>> .../coresight/coresight-etm4x-core.c | 54 ++------- >>> drivers/hwtracing/coresight/coresight-etm4x.h | 1 - >>> drivers/hwtracing/coresight/coresight-priv.h | 12 +- >>> drivers/hwtracing/coresight/coresight-stm.c | 3 +- >>> drivers/hwtracing/coresight/coresight-sysfs.c | 17 ++- >>> drivers/hwtracing/coresight/coresight-tpdm.c | 3 +- >>> include/linux/coresight.h | 12 +- >>> 13 files changed, 143 insertions(+), 157 deletions(-) >>> >> [...] >>> @@ -352,7 +352,7 @@ static void *etm_setup_aux(struct perf_event >>> *event, void **pages, >>> * CPUs, we can handle it and fail the session. >>> */ >>> for_each_cpu(cpu, mask) { >>> - struct list_head *path; >>> + struct coresight_path *path; >>> struct coresight_device *csdev; >>> csdev = per_cpu(csdev_src, cpu); >>> @@ -405,15 +405,15 @@ static void *etm_setup_aux(struct perf_event >>> *event, void **pages, >>> cpumask_clear_cpu(cpu, mask); >>> continue; >>> } >>> - >>> /* ensure we can allocate a trace ID for this CPU */ >>> - trace_id = coresight_trace_id_get_cpu_id_map(cpu, &sink- >>> >perf_sink_id_map); >>> - if (!IS_VALID_CS_TRACE_ID(trace_id)) { >>> + trace_id = coresight_path_assign_trace_id(path, CS_MODE_PERF); >>> + >>> + /* Can be 0 and valid, ETE doesn't need an ID */ >>> + if (trace_id < 0) { >> >> Not sure why I wrote it like this, but I think we should leave it as >> it was with !IS_VALID_CS_TRACE_ID(). Even with ETE it calls the trace >> ID allocator, so nothing has changed here. >> > Sure, Will restore. For ETE or ETM, we dont need traverse the path, just > directly allocate the trace id based on cpu id. > > Jie > > Sorry I meant to only keep the !IS_VALID_CS_TRACE_ID() bit. We still need to call the new coresight_path_assign_trace_id() otherwise it doesn't get assigned to the path. I saw that got removed in v11.

6 months

Re: [PATCH v10 0/7] Coresight: Add Coresight TMC Control Unit driver

by James Clark

On 07/02/2025 6:42 am, Jie Gan wrote: > The Coresight TMC Control Unit(CTCU) device hosts miscellaneous configuration > registers to control various features related to TMC ETR device. > > The CTCU device works as a helper device physically connected to the TMC ETR device. > --------------------------------------------------------- > |ETR0| |ETR1| > . \ / . > . \ / . > . \ / . > . \ / . > --------------------------------------------------- > ETR0ATID0-ETR0ATID3 CTCU ETR1ATID0-ETR1ATID3 > --------------------------------------------------- > Each ETR has four ATID registers with 128 bits long in total. > e.g. ETR0ATID0-ETR0ATID3 registers are used by ETR0 device. > > Based on the trace id which is programed in CTCU ATID register of > specific ETR, trace data with that trace id can get into ETR's buffer > while other trace data gets ignored. The number of CTCU ATID registers > depends on the number of defined TMC ETR devices. For example, two TMC > ETR devices need eight ATID registers. ETR0 with ETR0ATID0-ETR0ATID3 > and ETR1 with ETR1ATID0-ETRATID3. > > The significant challenge in enabling the data filter function is how > to collect the trace ID of the source device. The introduction of > trace_id callback function addresses this challenge. The callback function > collects trace ID of the device and return it back. The trace ID will be > stored in the structure called coresight_path and transmitted to helper > and sink devices. > > The coresight_path structure is created to address how to transmit > parameters needs by coresight_enable_path/coresight_disbale_path > functions. > > Here is the definition of the struct coresight_path: > /** > * struct coresight_path - data needed by enable/disable path > * @path: path from source to sink. > * @trace_id: trace_id of the whole path. > */ > struct coresight_path { > struct list_head *path; > u8 trace_id; > }; > > The atid_offset mentioned before is the offset to ATID register in CTCU > device. > > Enabling the source device will configure one bit in the ATID register based > on its trace ID. > Disabling the source devices will reset the bit in the AITD register > based on its trace ID. > > Useage: > Enable: > STM device with trace ID 5 and ETR0 is activated. > Bitmap before the enablement: > ETR0ATID0: > 31..................543210 > ========================== > 0000000000000000000000...0 > ========================== > > Bitmap after the enablement: > 31..................543210 > ========================== > 0000000000000...0000100000 > ========================== > > The bit 5 of the ETR0ATID0 register is configured to 1 when enabling the > STM device. > > Disable: > STM device with trace ID 5 and ETR0 is activated. > Bitmap before the disablement: > ETR0ATID0: > 31................6543210 > ========================= > 000000000010111...0100000 > ========================= > > Bitmap after the disablement > ETR0ATID0: > 31................6543210 > ========================= > 000000000010111...0000000 > ========================= > > The bit 5 of the ETR0ATID0 register is reset to 0 when disabling the STM > device. > > Sincere thanks to James Clark for providing an excellent idea to handle > the trace_id of the path. > > Changes in V2: > 1. Rename the device to Coresight Control Unit. > 2. Introduce the trace_id function pointer to address the challeng how to > properly collect the trace ID of the device. > 3. Introduce a new way to define the qcom,ccu-atid-offset property in > device tree. > 4. Disabling the filter function blocked on acquiring the ATID-offset, > which will be addressed in a separate patch once it’s ready. > Link to V1 - https://lore.kernel.org/lkml/20240618072726.3767974-1-quic_jiegan@quicinc.c… > > Changes in V3: > 1. Rename the device to Coresight TMC Control Unit(CTCU). > 2. Introduce a new way to define the platform related configs. The new > structure, qcom_ctcu_config, is used to store configurations specific > to a platform. Each platform should have its own qcom_ctcu_config structure. > 3. In perf mode, the ETM devices allocate their trace IDs using the > perf_sink_id_map. In sysfs mode, the ETM devices allocate their trace > IDs using the id_map_default. > 4. Considering the scenario where both ETR devices might be enabled simultaneously > with multiple sources, retrieving and using trace IDs instead of id_map is more effective > for the CTCU device in sysfs mode. For example, We can configure one ETR as sink for high > throughput trace data like ETM and another ETR for low throughput trace data like STM. > In this case, STM data won’t be flushed out by ETM data quickly. However, if we use id_map to > manage the trace IDs, we need to create a separate id_map for each ETR device. Addtionally, We > would need to iterate through the entire id_map for each configuration. > 5. Add support for apb's clock name "apb". If the function fails to obtain the clock with > the name "apb_pclk", it will attempt to acquire the clock with the name "apb". > Link to V2 - https://lore.kernel.org/linux-arm-msm/20240705090049.1656986-1-quic_jiegan@… > > Changes in V4: > 1. Add TMC description in binding file. > 2. Restrict the number of ports for the CTCU device to a range of 0 to 1 in the binding file, > because the maximum number of CTCU devices is 2 for existing projects. > Link to V3 - https://lore.kernel.org/linux-arm-kernel/20240812024141.2867655-1-quic_jieg… > > Changes in V5: > 1. Fix the format issue for description paragrah in dt binding file. > 2. Previous discussion for why use "in-ports" property instead of "ports". > Link to V4 - https://lore.kernel.org/linux-arm-msm/20240828012706.543605-1-quic_jiegan@q… > > Changes in V6: > 1. Collected reviewed-by tag from Rob for dt-binding patch. > 2. Rebased on tag next-20241008. > 3. Dropped all depends-on tags. > Link to V5 - https://lore.kernel.org/linux-arm-msm/20240909033458.3118238-1-quic_jiegan@… > > Changes in V7: > 1. Rebased on tag next-20241204. > 2. Fix format issue for dts patch. > - Padding the address part to 8 digits > Link to V6 - https://lore.kernel.org/linux-arm-msm/20241009112503.1851585-1-quic_jiegan@… > > Changes in V8: > 1. Rebased on tag next-20241220. > 2. Use raw_spinlock_t instead of spinlock_t. > 3. Remove redundant codes in CTCU driver: > - Eliminate unnecessary parameter validations. > - Correct log level when an error occurs. > - Optimize codes. > 4. Correct the subject prefix for DT patch. > 5. Collected reviewed-by tag from Konrad Dybcib for DT patch. > Link to V7 - https://lore.kernel.org/all/20241210031545.3468561-1-quic_jiegan@quicinc.co… > > Changes in V9: > 1. Rebased on tag next-20250113. > 2. Separate the previous trace_id patch (patch 2/5 Coresight: Add trace_id function to > retrieving the trace ID) into two patches. > 3. Introduce a new struct coresight_path instead of cs_sink_data which was > created in previous version. The coresight_path will be initialized > and constructed in coresight_build_path function and released by > coresight_release_path function. > Detail of the struct coresight_path is shown below: > /** > * struct coresight_path - data needed by enable/disable path > * @path: path from source to sink. > * @trace_id: trace_id of the whole path. > */ > struct coresight_path { > struct list_head *path; > u8 trace_id; > }; > > 4. Introduce an array of atomic in CTCU driver to represent the refcnt or each > enabled trace_id for each sink. The reason is there is a scenario that more > than one TPDM device physically connected to the same TPDA device has > been enabled. The CTCU driver must verify the refcnt before resetting the > bit of the atid register according to the trace_id of the TPDA device. > 5. Remove redundant codes in CTCU driver. > 6. Add reviewed-by tag to the commit message for APB clock path(patch > 1/5). > Link to V8 - https://lore.kernel.org/all/20241226011022.1477160-1-quic_jiegan@quicinc.co… > > Changes in V10: > 1. Introduce a new API to allocate and read trace_id after path is built. > 2. Introduce a new API to allocate and read trace_id of ETM device. > 3. Add a new patch: [PATCH v10 3/7] Coresight: Use coresight_etm_get_trace_id() in traceid_show() > 4. Remove perf handle from coresight_path. > 5. Use u8 instead of atomic_t for traceid_refcnt. > 6. Optimize the part of code in CTCU drvier that is responsible for program atid register. > Link to V9 - https://lore.kernel.org/all/20250124072537.1801030-1-quic_jiegan@quicinc.co… > > Jie Gan (7): > Coresight: Add support for new APB clock name > Coresight: Add trace_id function to retrieving the trace ID > Coresight: Use coresight_etm_get_trace_id() in traceid_show() > Coresight: Introduce a new struct coresight_path > dt-bindings: arm: Add Coresight TMC Control Unit hardware > Coresight: Add Coresight TMC Control Unit driver > arm64: dts: qcom: sa8775p: Add CTCU and ETR nodes > > .../bindings/arm/qcom,coresight-ctcu.yaml | 84 ++++++ > arch/arm64/boot/dts/qcom/sa8775p.dtsi | 153 ++++++++++ > drivers/hwtracing/coresight/Kconfig | 12 + > drivers/hwtracing/coresight/Makefile | 1 + > drivers/hwtracing/coresight/coresight-core.c | 133 +++++++-- > drivers/hwtracing/coresight/coresight-ctcu.c | 268 ++++++++++++++++++ > drivers/hwtracing/coresight/coresight-ctcu.h | 24 ++ > drivers/hwtracing/coresight/coresight-dummy.c | 16 +- > .../hwtracing/coresight/coresight-etm-perf.c | 30 +- > .../hwtracing/coresight/coresight-etm-perf.h | 2 +- > drivers/hwtracing/coresight/coresight-etm.h | 1 - > .../coresight/coresight-etm3x-core.c | 55 +--- > .../coresight/coresight-etm3x-sysfs.c | 3 +- > .../coresight/coresight-etm4x-core.c | 55 +--- > .../coresight/coresight-etm4x-sysfs.c | 4 +- > drivers/hwtracing/coresight/coresight-etm4x.h | 1 - > drivers/hwtracing/coresight/coresight-priv.h | 12 +- > drivers/hwtracing/coresight/coresight-stm.c | 14 +- > drivers/hwtracing/coresight/coresight-sysfs.c | 17 +- > drivers/hwtracing/coresight/coresight-tpda.c | 11 + > drivers/hwtracing/coresight/coresight-tpdm.c | 3 +- > include/linux/coresight.h | 30 +- > 22 files changed, 765 insertions(+), 164 deletions(-) > create mode 100644 Documentation/devicetree/bindings/arm/qcom,coresight-ctcu.yaml > create mode 100644 drivers/hwtracing/coresight/coresight-ctcu.c > create mode 100644 drivers/hwtracing/coresight/coresight-ctcu.h > Just one small comment, and the kernel test bot report to fix. Otherwise looks good to me. Reviewed-by: James Clark <james.clark(a)linaro.org>

6 months

Re: [PATCH v10 4/7] Coresight: Introduce a new struct coresight_path

by James Clark

On 07/02/2025 6:42 am, Jie Gan wrote: > Add 'struct coresight_path' to store the data that is needed by > coresight_enable_path/coresight_disable_path. The structure will be > transmitted to any required devices to enable related funcationalities. > > The trace_id will be allocated after the path is built. Consequently, > The ETM3x and ETM4x devices will directly read the trace_id from path > which result in etm_read_alloc_trace_id and etm4_read_alloc_trace_id > being deleted. > > Co-developed-by: James Clark <james.clark(a)linaro.org> > Signed-off-by: James Clark <james.clark(a)linaro.org> > Signed-off-by: Jie Gan <quic_jiegan(a)quicinc.com> > --- > drivers/hwtracing/coresight/coresight-core.c | 106 +++++++++++++----- > drivers/hwtracing/coresight/coresight-dummy.c | 5 +- > .../hwtracing/coresight/coresight-etm-perf.c | 30 +++-- > .../hwtracing/coresight/coresight-etm-perf.h | 2 +- > drivers/hwtracing/coresight/coresight-etm.h | 1 - > .../coresight/coresight-etm3x-core.c | 54 ++------- > .../coresight/coresight-etm4x-core.c | 54 ++------- > drivers/hwtracing/coresight/coresight-etm4x.h | 1 - > drivers/hwtracing/coresight/coresight-priv.h | 12 +- > drivers/hwtracing/coresight/coresight-stm.c | 3 +- > drivers/hwtracing/coresight/coresight-sysfs.c | 17 ++- > drivers/hwtracing/coresight/coresight-tpdm.c | 3 +- > include/linux/coresight.h | 12 +- > 13 files changed, 143 insertions(+), 157 deletions(-) > [...] > @@ -352,7 +352,7 @@ static void *etm_setup_aux(struct perf_event *event, void **pages, > * CPUs, we can handle it and fail the session. > */ > for_each_cpu(cpu, mask) { > - struct list_head *path; > + struct coresight_path *path; > struct coresight_device *csdev; > > csdev = per_cpu(csdev_src, cpu); > @@ -405,15 +405,15 @@ static void *etm_setup_aux(struct perf_event *event, void **pages, > cpumask_clear_cpu(cpu, mask); > continue; > } > - > /* ensure we can allocate a trace ID for this CPU */ > - trace_id = coresight_trace_id_get_cpu_id_map(cpu, &sink->perf_sink_id_map); > - if (!IS_VALID_CS_TRACE_ID(trace_id)) { > + trace_id = coresight_path_assign_trace_id(path, CS_MODE_PERF); > + > + /* Can be 0 and valid, ETE doesn't need an ID */ > + if (trace_id < 0) { Not sure why I wrote it like this, but I think we should leave it as it was with !IS_VALID_CS_TRACE_ID(). Even with ETE it calls the trace ID allocator, so nothing has changed here.

6 months

Re: [PATCH] coresight-tmc: stop disabling tmc when flush timeout

by Mike Leach

Hi, We are not seeing these problems on other systems with multiple ETMs. How are you using the system? Perf will strictly disable sources before sinks - which would mean that the ETMs will flush before the TMC requests a manual flush on stop. For sysfs use, we recommend the same, but even halting the TMC first should result in all sources being requested to flush at the same time (subject to propagation through connected trace funnels). On Fri, 7 Feb 2025 at 07:25, Yuanfang Zhang <quic_yuanfang(a)quicinc.com> wrote: > > > > On 2/6/2025 6:32 PM, Leo Yan wrote: > > Hi Yuanfang, > > > > On Fri, Jan 03, 2025 at 04:01:54PM +0800, Yuanfang Zhang wrote: > >> > >> When multiple ETMs are enabled simultaneously, the time required > >> to complete a flush in the process of reading the TMC device node > >> may exceed the default wait time of 100us. > > How do you know that it is the ETM flush process that is the issue? TMC ready can be delayed by issues in the memory system that prevent write to the memory buffer. The TMC flush complete will indicate completion of flush for all connected devices - so if flush complete is indicated by the TMC then a flush request cannot be the issue. With multiple ETMs, then the connected trace funnels arbitration will ensure flush is indicated complete on all connected inputs before transmitting to the output. The driver code to stop the TMC will first wait on flush complete before waiting on TMC ready. > > Have you tried how long time would be safe to wait for the > > TMCREADY_BIT bit to be set on your platform? > yes, 400000us. This is a huge amount of latency for a coresight system. This suggests some sort of contention issue. > > > >> If the TMC capture is stopped while any ETM has not completed its > >> flush, it can cause the corresponding CPU to hang. > >> There is nothing in the ETMv4 hardware specification /design that should cause an CPU to hang. There is an implementation dependent stall mechanism that if implemented can stall a PE when the ETM fifo approaches overflow, but this is switch off on the drivers, if implemented on the hardware. The flush process for the ETM is a purely internal process of clearing out all trace currently in the ETM, and is not dependent on the PE. > >> Fix the by checking the TMCReady bit after the flush. If TMCReady > >> bit is set, TraceCaptEn bit can be clear; otherwise, return directly > >> and stop the TMC read. > > > > When a timeout for TMC flush and stop is detected, if the driver > > arbitrarily bails out without disabling TMC, this would leave the > > hardware always on. > > I agree that this is not an acceptable solution - we cannot leave the TMC in an indeterminate state. Where clients such as perf are using the hardware there is no mechanism for re-trying if halt fails. The functions you have changed seem to relate to reading the buffer via sysfs. Do you see similar problems using perf to collect trace data? > > I would like first know if a longer timeout can fix the issue. > > > > Thanks, > > Leo > > > yes, longer timeout can fix this issue. > I think that a longer timeout will mask some underlying contention issue, but it should be possible to make the coresight driver timeout configurable, and set the value appropriately for your system. There is a new TMC logging patchset here: https://lists.linaro.org/archives/list/coresight@lists.linaro.org/thread/7Y… which improves the error reporting around timeouts. This might help establish if the error is in waiting for flush complete, or TMC ready. This API could be extended to add a timeout value parameter, that can be configured from the TMC driver, set via sysfs for the TMC in the initial case to further debugging of this issue on your system Regards Mike > >> Signed-off-by: Yuanfang Zhang <quic_yuanfang(a)quicinc.com> > >> --- > >> drivers/hwtracing/coresight/coresight-tmc-etf.c | 17 +++++++++++++++-- > >> drivers/hwtracing/coresight/coresight-tmc-etr.c | 22 +++++++++++++++++----- > >> 2 files changed, 32 insertions(+), 7 deletions(-) > >> > >> diff --git a/drivers/hwtracing/coresight/coresight-tmc-etf.c b/drivers/hwtracing/coresight/coresight-tmc-etf.c > >> index d4f641cd9de69488fe3d1c1dc9b5a9eafb55ed59..bded290c42891d782344d9a6e63ebdbed6719133 100644 > >> --- a/drivers/hwtracing/coresight/coresight-tmc-etf.c > >> +++ b/drivers/hwtracing/coresight/coresight-tmc-etf.c > >> @@ -80,11 +80,21 @@ static void tmc_etb_dump_hw(struct tmc_drvdata *drvdata) > >> return; > >> } > >> > >> -static void __tmc_etb_disable_hw(struct tmc_drvdata *drvdata) > >> +static int __tmc_etb_disable_hw(struct tmc_drvdata *drvdata) > >> { > >> + int rc; > >> + > >> CS_UNLOCK(drvdata->base); > >> > >> tmc_flush_and_stop(drvdata); > >> + > >> + rc = tmc_wait_for_tmcready(drvdata); > >> + if (rc) { > >> + dev_err(&drvdata->csdev->dev, > >> + "Failed to disable : TMC is not ready\n"); > >> + CS_LOCK(drvdata->base); > >> + return rc; > >> + } > >> /* > >> * When operating in sysFS mode the content of the buffer needs to be > >> * read before the TMC is disabled. > >> @@ -94,6 +104,7 @@ static void __tmc_etb_disable_hw(struct tmc_drvdata *drvdata) > >> tmc_disable_hw(drvdata); > >> > >> CS_LOCK(drvdata->base); > >> + return 0; > >> } > >> > >> static void tmc_etb_disable_hw(struct tmc_drvdata *drvdata) > >> @@ -650,7 +661,9 @@ int tmc_read_prepare_etb(struct tmc_drvdata *drvdata) > >> ret = -EINVAL; > >> goto out; > >> } > >> - __tmc_etb_disable_hw(drvdata); > >> + ret = __tmc_etb_disable_hw(drvdata); > >> + if (ret) > >> + goto out; > >> } > >> > >> drvdata->reading = true; > >> diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c > >> index a48bb85d0e7f44a25b813f3c828cc3d705d16012..63a1f7501562fa0b5c2fe6ea53dce4d82842bec3 100644 > >> --- a/drivers/hwtracing/coresight/coresight-tmc-etr.c > >> +++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c > >> @@ -1135,11 +1135,21 @@ static void tmc_etr_sync_sysfs_buf(struct tmc_drvdata *drvdata) > >> } > >> } > >> > >> -static void __tmc_etr_disable_hw(struct tmc_drvdata *drvdata) > >> +static int __tmc_etr_disable_hw(struct tmc_drvdata *drvdata) > >> { > >> + int rc; > >> + > >> CS_UNLOCK(drvdata->base); > >> > >> tmc_flush_and_stop(drvdata); > >> + > >> + rc = tmc_wait_for_tmcready(drvdata); > >> + if (rc) { > >> + dev_err(&drvdata->csdev->dev, > >> + "Failed to disable : TMC is not ready\n"); > >> + CS_LOCK(drvdata->base); > >> + return rc; > >> + } > >> /* > >> * When operating in sysFS mode the content of the buffer needs to be > >> * read before the TMC is disabled. > >> @@ -1150,7 +1160,7 @@ static void __tmc_etr_disable_hw(struct tmc_drvdata *drvdata) > >> tmc_disable_hw(drvdata); > >> > >> CS_LOCK(drvdata->base); > >> - > >> + return 0; > >> } > >> > >> void tmc_etr_disable_hw(struct tmc_drvdata *drvdata) > >> @@ -1779,9 +1789,11 @@ int tmc_read_prepare_etr(struct tmc_drvdata *drvdata) > >> } > >> > >> /* Disable the TMC if we are trying to read from a running session. */ > >> - if (coresight_get_mode(drvdata->csdev) == CS_MODE_SYSFS) > >> - __tmc_etr_disable_hw(drvdata); > >> - > >> + if (coresight_get_mode(drvdata->csdev) == CS_MODE_SYSFS) { > >> + ret = __tmc_etr_disable_hw(drvdata); > >> + if (ret) > >> + goto out; > >> + } > >> drvdata->reading = true; > >> out: > >> spin_unlock_irqrestore(&drvdata->spinlock, flags); > >> > >> --- > >> base-commit: fac04efc5c793dccbd07e2d59af9f90b7fc0dca4 > >> change-id: 20250103-fix_cpu_hung-b5a95179ada4 > >> > >> Best regards, > >> -- > >> Yuanfang Zhang <quic_yuanfang(a)quicinc.com> > >> > >> > -- Mike Leach Principal Engineer, ARM Ltd. Manchester Design Centre. UK

6 months, 1 week

[PATCH v13 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 v12 is posted here, https://lore.kernel.org/linux-arm-kernel/20241129084714.3057080-1-lcherian@… Changelog from v12: * Fixed wrong buffer pointer passed to coresigh_insert_barrier_packet * tmc_read_prepare/unprepare_crashdata need to be called only once and hence removed from read path and added to tmc_probe * tmc_read_prepare_crashdata renamed to tmc_prepare_crashdata and avoid taking locks as its moved to probe function. * Introduced read status flag, "reading" specific to reserved buffer to keep the reserved buffer reading independent of the regular buffer. * open/release ops for reserved buffer has to take care only about the set/unset the "reading" status flag as the reserved buffer is prepared during the probe time itself. * Few other trivial changes 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 metadata 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 | 308 ++++++++++++++- .../hwtracing/coresight/coresight-tmc-etf.c | 92 ++++- .../hwtracing/coresight/coresight-tmc-etr.c | 184 ++++++++- drivers/hwtracing/coresight/coresight-tmc.h | 105 +++++ include/linux/coresight.h | 12 + 12 files changed, 1208 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 05/27] ABI: sysfs-bus-coresight-*: fix kernelversion tags

by Suzuki K Poulose

On 10/02/2025 10:17, Mauro Carvalho Chehab wrote: > Some kernelversion tags are missing colons. Add them to comply with > ABI description and produce right results when converted to html/pdf. > > Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei(a)kernel.org> > --- > .../testing/sysfs-bus-coresight-devices-cti | 78 +++++++++---------- > .../testing/sysfs-bus-coresight-devices-tpdm | 52 ++++++------- > 2 files changed, 65 insertions(+), 65 deletions(-) Acked-by: Suzuki K Poulose <suzuki.poulose(a)arm.com> > > diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-cti b/Documentation/ABI/testing/sysfs-bus-coresight-devices-cti > index bf2869c413e7..a97b70f588da 100644 > --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-cti > +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-cti > @@ -1,241 +1,241 @@ > What: /sys/bus/coresight/devices/<cti-name>/enable > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (RW) Enable/Disable the CTI hardware. > > What: /sys/bus/coresight/devices/<cti-name>/powered > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Read) Indicate if the CTI hardware is powered. > > What: /sys/bus/coresight/devices/<cti-name>/ctmid > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Read) Display the associated CTM ID > > What: /sys/bus/coresight/devices/<cti-name>/nr_trigger_cons > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Read) Number of devices connected to triggers on this CTI > > What: /sys/bus/coresight/devices/<cti-name>/triggers<N>/name > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Read) Name of connected device <N> > > What: /sys/bus/coresight/devices/<cti-name>/triggers<N>/in_signals > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Read) Input trigger signals from connected device <N> > > What: /sys/bus/coresight/devices/<cti-name>/triggers<N>/in_types > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Read) Functional types for the input trigger signals > from connected device <N> > > What: /sys/bus/coresight/devices/<cti-name>/triggers<N>/out_signals > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Read) Output trigger signals to connected device <N> > > What: /sys/bus/coresight/devices/<cti-name>/triggers<N>/out_types > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Read) Functional types for the output trigger signals > to connected device <N> > > What: /sys/bus/coresight/devices/<cti-name>/regs/inout_sel > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (RW) Select the index for inen and outen registers. > > What: /sys/bus/coresight/devices/<cti-name>/regs/inen > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (RW) Read or write the CTIINEN register selected by inout_sel. > > What: /sys/bus/coresight/devices/<cti-name>/regs/outen > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (RW) Read or write the CTIOUTEN register selected by inout_sel. > > What: /sys/bus/coresight/devices/<cti-name>/regs/gate > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (RW) Read or write CTIGATE register. > > What: /sys/bus/coresight/devices/<cti-name>/regs/asicctl > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (RW) Read or write ASICCTL register. > > What: /sys/bus/coresight/devices/<cti-name>/regs/intack > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Write) Write the INTACK register. > > What: /sys/bus/coresight/devices/<cti-name>/regs/appset > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (RW) Set CTIAPPSET register to activate channel. Read back to > determine current value of register. > > What: /sys/bus/coresight/devices/<cti-name>/regs/appclear > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Write) Write APPCLEAR register to deactivate channel. > > What: /sys/bus/coresight/devices/<cti-name>/regs/apppulse > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Write) Write APPPULSE to pulse a channel active for one clock > cycle. > > What: /sys/bus/coresight/devices/<cti-name>/regs/chinstatus > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Read) Read current status of channel inputs. > > What: /sys/bus/coresight/devices/<cti-name>/regs/choutstatus > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Read) read current status of channel outputs. > > What: /sys/bus/coresight/devices/<cti-name>/regs/triginstatus > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Read) read current status of input trigger signals > > What: /sys/bus/coresight/devices/<cti-name>/regs/trigoutstatus > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Read) read current status of output trigger signals. > > What: /sys/bus/coresight/devices/<cti-name>/channels/trigin_attach > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Write) Attach a CTI input trigger to a CTM channel. > > What: /sys/bus/coresight/devices/<cti-name>/channels/trigin_detach > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Write) Detach a CTI input trigger from a CTM channel. > > What: /sys/bus/coresight/devices/<cti-name>/channels/trigout_attach > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Write) Attach a CTI output trigger to a CTM channel. > > What: /sys/bus/coresight/devices/<cti-name>/channels/trigout_detach > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Write) Detach a CTI output trigger from a CTM channel. > > What: /sys/bus/coresight/devices/<cti-name>/channels/chan_gate_enable > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (RW) Enable CTIGATE for single channel (Write) or list enabled > channels through the gate (R). > > What: /sys/bus/coresight/devices/<cti-name>/channels/chan_gate_disable > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Write) Disable CTIGATE for single channel. > > What: /sys/bus/coresight/devices/<cti-name>/channels/chan_set > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Write) Activate a single channel. > > What: /sys/bus/coresight/devices/<cti-name>/channels/chan_clear > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Write) Deactivate a single channel. > > What: /sys/bus/coresight/devices/<cti-name>/channels/chan_pulse > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Write) Pulse a single channel - activate for a single clock cycle. > > What: /sys/bus/coresight/devices/<cti-name>/channels/trigout_filtered > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Read) List of output triggers filtered across all connections. > > What: /sys/bus/coresight/devices/<cti-name>/channels/trig_filter_enable > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (RW) Enable or disable trigger output signal filtering. > > What: /sys/bus/coresight/devices/<cti-name>/channels/chan_inuse > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Read) show channels with at least one attached trigger signal. > > What: /sys/bus/coresight/devices/<cti-name>/channels/chan_free > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Read) show channels with no attached trigger signals. > > What: /sys/bus/coresight/devices/<cti-name>/channels/chan_xtrigs_sel > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (RW) Write channel number to select a channel to view, read to > see selected channel number. > > What: /sys/bus/coresight/devices/<cti-name>/channels/chan_xtrigs_in > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Read) Read to see input triggers connected to selected view > channel. > > What: /sys/bus/coresight/devices/<cti-name>/channels/chan_xtrigs_out > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Read) Read to see output triggers connected to selected view > channel. > > What: /sys/bus/coresight/devices/<cti-name>/channels/chan_xtrigs_reset > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Write) Clear all channel / trigger programming. > diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm > index bf710ea6e0ef..53cb454b60d0 100644 > --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm > +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm > @@ -1,6 +1,6 @@ > What: /sys/bus/coresight/devices/<tpdm-name>/integration_test > Date: January 2023 > -KernelVersion 6.2 > +KernelVersion: 6.2 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (Write) Run integration test for tpdm. Integration test > @@ -14,7 +14,7 @@ Description: > > What: /sys/bus/coresight/devices/<tpdm-name>/reset_dataset > Date: March 2023 > -KernelVersion 6.7 > +KernelVersion: 6.7 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (Write) Reset the dataset of the tpdm. > @@ -24,7 +24,7 @@ Description: > > What: /sys/bus/coresight/devices/<tpdm-name>/dsb_trig_type > Date: March 2023 > -KernelVersion 6.7 > +KernelVersion: 6.7 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (RW) Set/Get the trigger type of the DSB for tpdm. > @@ -35,7 +35,7 @@ Description: > > What: /sys/bus/coresight/devices/<tpdm-name>/dsb_trig_ts > Date: March 2023 > -KernelVersion 6.7 > +KernelVersion: 6.7 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (RW) Set/Get the trigger timestamp of the DSB for tpdm. > @@ -46,7 +46,7 @@ Description: > > What: /sys/bus/coresight/devices/<tpdm-name>/dsb_mode > Date: March 2023 > -KernelVersion 6.7 > +KernelVersion: 6.7 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (RW) Set/Get the programming mode of the DSB for tpdm. > @@ -60,7 +60,7 @@ Description: > > What: /sys/bus/coresight/devices/<tpdm-name>/dsb_edge/ctrl_idx > Date: March 2023 > -KernelVersion 6.7 > +KernelVersion: 6.7 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (RW) Set/Get the index number of the edge detection for the DSB > @@ -69,7 +69,7 @@ Description: > > What: /sys/bus/coresight/devices/<tpdm-name>/dsb_edge/ctrl_val > Date: March 2023 > -KernelVersion 6.7 > +KernelVersion: 6.7 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > Write a data to control the edge detection corresponding to > @@ -85,7 +85,7 @@ Description: > > What: /sys/bus/coresight/devices/<tpdm-name>/dsb_edge/ctrl_mask > Date: March 2023 > -KernelVersion 6.7 > +KernelVersion: 6.7 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > Write a data to mask the edge detection corresponding to the index > @@ -97,21 +97,21 @@ Description: > > What: /sys/bus/coresight/devices/<tpdm-name>/dsb_edge/edcr[0:15] > Date: March 2023 > -KernelVersion 6.7 > +KernelVersion: 6.7 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > Read a set of the edge control value of the DSB in TPDM. > > What: /sys/bus/coresight/devices/<tpdm-name>/dsb_edge/edcmr[0:7] > Date: March 2023 > -KernelVersion 6.7 > +KernelVersion: 6.7 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > Read a set of the edge control mask of the DSB in TPDM. > > What: /sys/bus/coresight/devices/<tpdm-name>/dsb_trig_patt/xpr[0:7] > Date: March 2023 > -KernelVersion 6.7 > +KernelVersion: 6.7 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (RW) Set/Get the value of the trigger pattern for the DSB > @@ -119,7 +119,7 @@ Description: > > What: /sys/bus/coresight/devices/<tpdm-name>/dsb_trig_patt/xpmr[0:7] > Date: March 2023 > -KernelVersion 6.7 > +KernelVersion: 6.7 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (RW) Set/Get the mask of the trigger pattern for the DSB > @@ -127,21 +127,21 @@ Description: > > What: /sys/bus/coresight/devices/<tpdm-name>/dsb_patt/tpr[0:7] > Date: March 2023 > -KernelVersion 6.7 > +KernelVersion: 6.7 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (RW) Set/Get the value of the pattern for the DSB subunit TPDM. > > What: /sys/bus/coresight/devices/<tpdm-name>/dsb_patt/tpmr[0:7] > Date: March 2023 > -KernelVersion 6.7 > +KernelVersion: 6.7 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (RW) Set/Get the mask of the pattern for the DSB subunit TPDM. > > What: /sys/bus/coresight/devices/<tpdm-name>/dsb_patt/enable_ts > Date: March 2023 > -KernelVersion 6.7 > +KernelVersion: 6.7 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (Write) Set the pattern timestamp of DSB tpdm. Read > @@ -153,7 +153,7 @@ Description: > > What: /sys/bus/coresight/devices/<tpdm-name>/dsb_patt/set_type > Date: March 2023 > -KernelVersion 6.7 > +KernelVersion: 6.7 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (Write) Set the pattern type of DSB tpdm. Read > @@ -165,7 +165,7 @@ Description: > > What: /sys/bus/coresight/devices/<tpdm-name>/dsb_msr/msr[0:31] > Date: March 2023 > -KernelVersion 6.7 > +KernelVersion: 6.7 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (RW) Set/Get the MSR(mux select register) for the DSB subunit > @@ -173,7 +173,7 @@ Description: > > What: /sys/bus/coresight/devices/<tpdm-name>/cmb_mode > Date: January 2024 > -KernelVersion 6.9 > +KernelVersion: 6.9 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: (Write) Set the data collection mode of CMB tpdm. Continuous > change creates CMB data set elements on every CMBCLK edge. > @@ -187,7 +187,7 @@ Description: (Write) Set the data collection mode of CMB tpdm. Continuous > > What: /sys/bus/coresight/devices/<tpdm-name>/cmb_trig_patt/xpr[0:1] > Date: January 2024 > -KernelVersion 6.9 > +KernelVersion: 6.9 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (RW) Set/Get the value of the trigger pattern for the CMB > @@ -195,7 +195,7 @@ Description: > > What: /sys/bus/coresight/devices/<tpdm-name>/cmb_trig_patt/xpmr[0:1] > Date: January 2024 > -KernelVersion 6.9 > +KernelVersion: 6.9 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (RW) Set/Get the mask of the trigger pattern for the CMB > @@ -203,21 +203,21 @@ Description: > > What: /sys/bus/coresight/devices/<tpdm-name>/dsb_patt/tpr[0:1] > Date: January 2024 > -KernelVersion 6.9 > +KernelVersion: 6.9 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (RW) Set/Get the value of the pattern for the CMB subunit TPDM. > > What: /sys/bus/coresight/devices/<tpdm-name>/dsb_patt/tpmr[0:1] > Date: January 2024 > -KernelVersion 6.9 > +KernelVersion: 6.9 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (RW) Set/Get the mask of the pattern for the CMB subunit TPDM. > > What: /sys/bus/coresight/devices/<tpdm-name>/cmb_patt/enable_ts > Date: January 2024 > -KernelVersion 6.9 > +KernelVersion: 6.9 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (Write) Set the pattern timestamp of CMB tpdm. Read > @@ -229,7 +229,7 @@ Description: > > What: /sys/bus/coresight/devices/<tpdm-name>/cmb_trig_ts > Date: January 2024 > -KernelVersion 6.9 > +KernelVersion: 6.9 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (RW) Set/Get the trigger timestamp of the CMB for tpdm. > @@ -240,7 +240,7 @@ Description: > > What: /sys/bus/coresight/devices/<tpdm-name>/cmb_ts_all > Date: January 2024 > -KernelVersion 6.9 > +KernelVersion: 6.9 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (RW) Read or write the status of timestamp upon all interface. > @@ -252,7 +252,7 @@ Description: > > What: /sys/bus/coresight/devices/<tpdm-name>/cmb_msr/msr[0:31] > Date: January 2024 > -KernelVersion 6.9 > +KernelVersion: 6.9 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (RW) Set/Get the MSR(mux select register) for the CMB subunit

6 months, 1 week

Re: [PATCH 1/3] coresight: Don't save handle in path

by James Clark

On 06/02/2025 3:02 am, Jie Gan wrote: > > > On 2/1/2025 12:36 AM, James Clark wrote: >> Signed-off-by: James Clark <james.clark(a)linaro.org> >> --- >> drivers/hwtracing/coresight/coresight-core.c | 10 +++++----- >> drivers/hwtracing/coresight/coresight-dummy.c | 2 +- >> drivers/hwtracing/coresight/coresight-etb10.c | 8 +++----- >> drivers/hwtracing/coresight/coresight-etm-perf.c | 3 +-- >> drivers/hwtracing/coresight/coresight-priv.h | 4 ++-- >> drivers/hwtracing/coresight/coresight-sysfs.c | 2 +- >> drivers/hwtracing/coresight/coresight-tmc-etf.c | 9 ++++----- >> drivers/hwtracing/coresight/coresight-tmc-etr.c | 13 +++++-------- >> drivers/hwtracing/coresight/coresight-tmc.h | 2 +- >> drivers/hwtracing/coresight/coresight-tpiu.c | 2 +- >> drivers/hwtracing/coresight/coresight-trbe.c | 4 +--- >> drivers/hwtracing/coresight/ultrasoc-smb.c | 8 +++----- >> include/linux/coresight.h | 2 +- >> 13 files changed, 29 insertions(+), 40 deletions(-) >> > > Hi James > > I removed the handle from coresight_path and placed these codes in a > separate patch. However, I believe this change is not related to the > CTCU driver or coresight_path. Therefore, I suggest we submit it > independently. > > Thanks, > Jie > > Yeah if you've removed the handle from the path then we can do the other void* changes separately. Makes sense. >> diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/ >> hwtracing/coresight/coresight-core.c >> index 11d5d5320b1a..253ef02fde12 100644 >> --- a/drivers/hwtracing/coresight/coresight-core.c >> +++ b/drivers/hwtracing/coresight/coresight-core.c >> @@ -272,9 +272,9 @@ void coresight_add_helper(struct coresight_device >> *csdev, >> EXPORT_SYMBOL_GPL(coresight_add_helper); >> static int coresight_enable_sink(struct coresight_device *csdev, >> - enum cs_mode mode, void *data) >> + enum cs_mode mode, struct perf_output_handle *handle) >> { >> - return sink_ops(csdev)->enable(csdev, mode, data); >> + return sink_ops(csdev)->enable(csdev, mode, handle); >> } >> static void coresight_disable_sink(struct coresight_device *csdev) >> @@ -448,7 +448,8 @@ static int coresight_enable_helpers(struct >> coresight_device *csdev, >> return 0; >> } >> -int coresight_enable_path(struct coresight_path *cs_path, enum >> cs_mode mode) >> +int coresight_enable_path(struct coresight_path *cs_path, enum >> cs_mode mode, >> + struct perf_output_handle *handle) >> { >> int ret = 0; >> u32 type; >> @@ -479,7 +480,7 @@ int coresight_enable_path(struct coresight_path >> *cs_path, enum cs_mode mode) >> switch (type) { >> case CORESIGHT_DEV_TYPE_SINK: >> - ret = coresight_enable_sink(csdev, mode, cs_path); >> + ret = coresight_enable_sink(csdev, mode, handle); >> /* >> * Sink is the first component turned on. If we >> * failed to enable the sink, there are no components >> @@ -807,7 +808,6 @@ void coresight_release_path(struct coresight_path >> *cs_path) >> kfree(nd); >> } >> - cs_path->handle = NULL; >> kfree(cs_path->path); >> kfree(cs_path); >> } >> diff --git a/drivers/hwtracing/coresight/coresight-dummy.c b/drivers/ >> hwtracing/coresight/coresight-dummy.c >> index dfcf24e9c49a..6f86d33efef4 100644 >> --- a/drivers/hwtracing/coresight/coresight-dummy.c >> +++ b/drivers/hwtracing/coresight/coresight-dummy.c >> @@ -54,7 +54,7 @@ static int dummy_source_trace_id(struct >> coresight_device *csdev, enum cs_mode mo >> } >> static int dummy_sink_enable(struct coresight_device *csdev, enum >> cs_mode mode, >> - void *data) >> + struct perf_output_handle *handle) >> { >> dev_dbg(csdev->dev.parent, "Dummy sink enabled\n"); >> diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/ >> hwtracing/coresight/coresight-etb10.c >> index 05430d8931d1..e373b0f590bf 100644 >> --- a/drivers/hwtracing/coresight/coresight-etb10.c >> +++ b/drivers/hwtracing/coresight/coresight-etb10.c >> @@ -167,14 +167,12 @@ static int etb_enable_sysfs(struct >> coresight_device *csdev) >> return ret; >> } >> -static int etb_enable_perf(struct coresight_device *csdev, void *data) >> +static int etb_enable_perf(struct coresight_device *csdev, struct >> perf_output_handle *handle) >> { >> int ret = 0; >> pid_t pid; >> unsigned long flags; >> struct etb_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); >> - struct coresight_path *cs_path = (struct coresight_path *)data; >> - struct perf_output_handle *handle = cs_path->handle; >> struct cs_buffers *buf = etm_perf_sink_config(handle); >> spin_lock_irqsave(&drvdata->spinlock, flags); >> @@ -225,7 +223,7 @@ static int etb_enable_perf(struct coresight_device >> *csdev, void *data) >> } >> static int etb_enable(struct coresight_device *csdev, enum cs_mode >> mode, >> - void *data) >> + struct perf_output_handle *handle) >> { >> int ret; >> @@ -234,7 +232,7 @@ static int etb_enable(struct coresight_device >> *csdev, enum cs_mode mode, >> ret = etb_enable_sysfs(csdev); >> break; >> case CS_MODE_PERF: >> - ret = etb_enable_perf(csdev, data); >> + ret = etb_enable_perf(csdev, handle); >> break; >> default: >> ret = -EINVAL; >> diff --git a/drivers/hwtracing/coresight/coresight-etm-perf.c b/ >> drivers/hwtracing/coresight/coresight-etm-perf.c >> index b6765abb0a26..0fad9968c2c0 100644 >> --- a/drivers/hwtracing/coresight/coresight-etm-perf.c >> +++ b/drivers/hwtracing/coresight/coresight-etm-perf.c >> @@ -501,9 +501,8 @@ static void etm_event_start(struct perf_event >> *event, int flags) >> if (WARN_ON_ONCE(!sink)) >> goto fail_end_stop; >> - cs_path->handle = handle; >> /* Nothing will happen without a path */ >> - if (coresight_enable_path(cs_path, CS_MODE_PERF)) >> + if (coresight_enable_path(cs_path, CS_MODE_PERF, handle)) >> goto fail_end_stop; >> /* Finally enable the tracer */ >> diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/ >> hwtracing/coresight/coresight-priv.h >> index 8e02a222b9f8..7bd43304f461 100644 >> --- a/drivers/hwtracing/coresight/coresight-priv.h >> +++ b/drivers/hwtracing/coresight/coresight-priv.h >> @@ -112,7 +112,6 @@ struct cs_buffers { >> * @trace_id: trace_id of the whole path. >> */ >> struct coresight_path { >> - struct perf_output_handle *handle; >> struct list_head *path; >> u8 trace_id; >> }; >> @@ -142,7 +141,8 @@ static inline void CS_UNLOCK(void __iomem *addr) >> } >> void coresight_disable_path(struct coresight_path *cs_path); >> -int coresight_enable_path(struct coresight_path *cs_path, enum >> cs_mode mode); >> +int coresight_enable_path(struct coresight_path *cs_path, enum >> cs_mode mode, >> + struct perf_output_handle *handle); >> struct coresight_device *coresight_get_sink(struct list_head *path); >> struct coresight_device *coresight_get_sink_by_id(u32 id); >> struct coresight_device * >> diff --git a/drivers/hwtracing/coresight/coresight-sysfs.c b/drivers/ >> hwtracing/coresight/coresight-sysfs.c >> index 04e76cc1bfdf..f9a6b838726c 100644 >> --- a/drivers/hwtracing/coresight/coresight-sysfs.c >> +++ b/drivers/hwtracing/coresight/coresight-sysfs.c >> @@ -209,7 +209,7 @@ int coresight_enable_sysfs(struct coresight_device >> *csdev) >> goto out; >> } >> - ret = coresight_enable_path(cs_path, CS_MODE_SYSFS); >> + ret = coresight_enable_path(cs_path, CS_MODE_SYSFS, NULL); >> if (ret) >> goto err_path; >> diff --git a/drivers/hwtracing/coresight/coresight-tmc-etf.c b/ >> drivers/hwtracing/coresight/coresight-tmc-etf.c >> index e6b07f917556..fdf1c2511d67 100644 >> --- a/drivers/hwtracing/coresight/coresight-tmc-etf.c >> +++ b/drivers/hwtracing/coresight/coresight-tmc-etf.c >> @@ -244,14 +244,13 @@ static int tmc_enable_etf_sink_sysfs(struct >> coresight_device *csdev) >> return ret; >> } >> -static int tmc_enable_etf_sink_perf(struct coresight_device *csdev, >> void *data) >> +static int tmc_enable_etf_sink_perf(struct coresight_device *csdev, >> + struct perf_output_handle *handle) >> { >> int ret = 0; >> pid_t pid; >> unsigned long flags; >> struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); >> - struct coresight_path *cs_path= (struct coresight_path *)data; >> - struct perf_output_handle *handle = cs_path->handle; >> struct cs_buffers *buf = etm_perf_sink_config(handle); >> spin_lock_irqsave(&drvdata->spinlock, flags); >> @@ -303,7 +302,7 @@ static int tmc_enable_etf_sink_perf(struct >> coresight_device *csdev, void *data) >> } >> static int tmc_enable_etf_sink(struct coresight_device *csdev, >> - enum cs_mode mode, void *data) >> + enum cs_mode mode, struct perf_output_handle *handle) >> { >> int ret; >> @@ -312,7 +311,7 @@ static int tmc_enable_etf_sink(struct >> coresight_device *csdev, >> ret = tmc_enable_etf_sink_sysfs(csdev); >> break; >> case CS_MODE_PERF: >> - ret = tmc_enable_etf_sink_perf(csdev, data); >> + ret = tmc_enable_etf_sink_perf(csdev, handle); >> break; >> /* We shouldn't be here */ >> default: >> diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/ >> drivers/hwtracing/coresight/coresight-tmc-etr.c >> index 82a872882e24..2d0bd06bab2a 100644 >> --- a/drivers/hwtracing/coresight/coresight-tmc-etr.c >> +++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c >> @@ -1252,10 +1252,8 @@ static int tmc_enable_etr_sink_sysfs(struct >> coresight_device *csdev) >> } >> struct etr_buf *tmc_etr_get_buffer(struct coresight_device *csdev, >> - enum cs_mode mode, void *data) >> + enum cs_mode mode, struct perf_output_handle *handle) >> { >> - struct coresight_path *cs_path = (struct coresight_path *)data; >> - struct perf_output_handle *handle = cs_path->handle; >> struct etr_perf_buffer *etr_perf; >> switch (mode) { >> @@ -1643,14 +1641,13 @@ tmc_update_etr_buffer(struct coresight_device >> *csdev, >> return size; >> } >> -static int tmc_enable_etr_sink_perf(struct coresight_device *csdev, >> void *data) >> +static int tmc_enable_etr_sink_perf(struct coresight_device *csdev, >> + struct perf_output_handle *handle) >> { >> int rc = 0; >> pid_t pid; >> unsigned long flags; >> struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); >> - struct coresight_path *cs_path = (struct coresight_path *)data; >> - struct perf_output_handle *handle = cs_path->handle; >> struct etr_perf_buffer *etr_perf = etm_perf_sink_config(handle); >> spin_lock_irqsave(&drvdata->spinlock, flags); >> @@ -1698,13 +1695,13 @@ static int tmc_enable_etr_sink_perf(struct >> coresight_device *csdev, void *data) >> } >> static int tmc_enable_etr_sink(struct coresight_device *csdev, >> - enum cs_mode mode, void *data) >> + enum cs_mode mode, struct perf_output_handle *handle) >> { >> switch (mode) { >> case CS_MODE_SYSFS: >> return tmc_enable_etr_sink_sysfs(csdev); >> case CS_MODE_PERF: >> - return tmc_enable_etr_sink_perf(csdev, data); >> + return tmc_enable_etr_sink_perf(csdev, handle); >> default: >> return -EINVAL; >> } >> diff --git a/drivers/hwtracing/coresight/coresight-tmc.h b/drivers/ >> hwtracing/coresight/coresight-tmc.h >> index 2671926be62a..e991afd43742 100644 >> --- a/drivers/hwtracing/coresight/coresight-tmc.h >> +++ b/drivers/hwtracing/coresight/coresight-tmc.h >> @@ -336,7 +336,7 @@ struct coresight_device >> *tmc_etr_get_catu_device(struct tmc_drvdata *drvdata); >> void tmc_etr_set_catu_ops(const struct etr_buf_operations *catu); >> void tmc_etr_remove_catu_ops(void); >> struct etr_buf *tmc_etr_get_buffer(struct coresight_device *csdev, >> - enum cs_mode mode, void *data); >> + enum cs_mode mode, struct perf_output_handle >> *handle); >> extern const struct attribute_group coresight_etr_group; >> #endif >> diff --git a/drivers/hwtracing/coresight/coresight-tpiu.c b/drivers/ >> hwtracing/coresight/coresight-tpiu.c >> index 97ef36f03ec2..ccf463ac7bf5 100644 >> --- a/drivers/hwtracing/coresight/coresight-tpiu.c >> +++ b/drivers/hwtracing/coresight/coresight-tpiu.c >> @@ -75,7 +75,7 @@ static void tpiu_enable_hw(struct csdev_access *csa) >> } >> static int tpiu_enable(struct coresight_device *csdev, enum cs_mode >> mode, >> - void *__unused) >> + struct perf_output_handle *__unused) >> { >> struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); >> diff --git a/drivers/hwtracing/coresight/coresight-trbe.c b/drivers/ >> hwtracing/coresight/coresight-trbe.c >> index 5005efd88a66..997d5976d2d2 100644 >> --- a/drivers/hwtracing/coresight/coresight-trbe.c >> +++ b/drivers/hwtracing/coresight/coresight-trbe.c >> @@ -1009,12 +1009,10 @@ static int __arm_trbe_enable(struct trbe_buf >> *buf, >> } >> static int arm_trbe_enable(struct coresight_device *csdev, enum >> cs_mode mode, >> - void *data) >> + struct perf_output_handle *handle) >> { >> struct trbe_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); >> struct trbe_cpudata *cpudata = dev_get_drvdata(&csdev->dev); >> - struct coresight_path *cs_path = (struct coresight_path *)data; >> - struct perf_output_handle *handle = cs_path->handle; >> struct trbe_buf *buf = etm_perf_sink_config(handle); >> WARN_ON(cpudata->cpu != smp_processor_id()); >> diff --git a/drivers/hwtracing/coresight/ultrasoc-smb.c b/drivers/ >> hwtracing/coresight/ultrasoc-smb.c >> index 9be88394b3bb..1574b5067206 100644 >> --- a/drivers/hwtracing/coresight/ultrasoc-smb.c >> +++ b/drivers/hwtracing/coresight/ultrasoc-smb.c >> @@ -213,11 +213,9 @@ static void smb_enable_sysfs(struct >> coresight_device *csdev) >> coresight_set_mode(csdev, CS_MODE_SYSFS); >> } >> -static int smb_enable_perf(struct coresight_device *csdev, void *data) >> +static int smb_enable_perf(struct coresight_device *csdev, struct >> perf_output_handle *handle) >> { >> struct smb_drv_data *drvdata = dev_get_drvdata(csdev->dev.parent); >> - struct coresight_path *cs_path = (struct coresight_path *)data; >> - struct perf_output_handle *handle = cs_path->handle; >> struct cs_buffers *buf = etm_perf_sink_config(handle); >> pid_t pid; >> @@ -241,7 +239,7 @@ static int smb_enable_perf(struct coresight_device >> *csdev, void *data) >> } >> static int smb_enable(struct coresight_device *csdev, enum cs_mode >> mode, >> - void *data) >> + struct perf_output_handle *handle) >> { >> struct smb_drv_data *drvdata = dev_get_drvdata(csdev->dev.parent); >> int ret = 0; >> @@ -262,7 +260,7 @@ static int smb_enable(struct coresight_device >> *csdev, enum cs_mode mode, >> smb_enable_sysfs(csdev); >> break; >> case CS_MODE_PERF: >> - ret = smb_enable_perf(csdev, data); >> + ret = smb_enable_perf(csdev, handle); >> break; >> default: >> ret = -EINVAL; >> diff --git a/include/linux/coresight.h b/include/linux/coresight.h >> index 87f9baa7fefe..a859fc00eef9 100644 >> --- a/include/linux/coresight.h >> +++ b/include/linux/coresight.h >> @@ -353,7 +353,7 @@ enum cs_mode { >> */ >> struct coresight_ops_sink { >> int (*enable)(struct coresight_device *csdev, enum cs_mode mode, >> - void *data); >> + struct perf_output_handle *handle); >> int (*disable)(struct coresight_device *csdev); >> void *(*alloc_buffer)(struct coresight_device *csdev, >> struct perf_event *event, void **pages, >

6 months, 1 week

[PATCH] coresight-tmc: stop disabling tmc when flush timeout

by Yuanfang Zhang

When multiple ETMs are enabled simultaneously, the time required to complete a flush in the process of reading the TMC device node may exceed the default wait time of 100us. If the TMC capture is stopped while any ETM has not completed its flush, it can cause the corresponding CPU to hang. Fix the by checking the TMCReady bit after the flush. If TMCReady bit is set, TraceCaptEn bit can be clear; otherwise, return directly and stop the TMC read. Signed-off-by: Yuanfang Zhang <quic_yuanfang(a)quicinc.com> --- drivers/hwtracing/coresight/coresight-tmc-etf.c | 17 +++++++++++++++-- drivers/hwtracing/coresight/coresight-tmc-etr.c | 22 +++++++++++++++++----- 2 files changed, 32 insertions(+), 7 deletions(-) diff --git a/drivers/hwtracing/coresight/coresight-tmc-etf.c b/drivers/hwtracing/coresight/coresight-tmc-etf.c index d4f641cd9de69488fe3d1c1dc9b5a9eafb55ed59..bded290c42891d782344d9a6e63ebdbed6719133 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-etf.c +++ b/drivers/hwtracing/coresight/coresight-tmc-etf.c @@ -80,11 +80,21 @@ static void tmc_etb_dump_hw(struct tmc_drvdata *drvdata) return; } -static void __tmc_etb_disable_hw(struct tmc_drvdata *drvdata) +static int __tmc_etb_disable_hw(struct tmc_drvdata *drvdata) { + int rc; + CS_UNLOCK(drvdata->base); tmc_flush_and_stop(drvdata); + + rc = tmc_wait_for_tmcready(drvdata); + if (rc) { + dev_err(&drvdata->csdev->dev, + "Failed to disable : TMC is not ready\n"); + CS_LOCK(drvdata->base); + return rc; + } /* * When operating in sysFS mode the content of the buffer needs to be * read before the TMC is disabled. @@ -94,6 +104,7 @@ static void __tmc_etb_disable_hw(struct tmc_drvdata *drvdata) tmc_disable_hw(drvdata); CS_LOCK(drvdata->base); + return 0; } static void tmc_etb_disable_hw(struct tmc_drvdata *drvdata) @@ -650,7 +661,9 @@ int tmc_read_prepare_etb(struct tmc_drvdata *drvdata) ret = -EINVAL; goto out; } - __tmc_etb_disable_hw(drvdata); + ret = __tmc_etb_disable_hw(drvdata); + if (ret) + goto out; } drvdata->reading = true; diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c index a48bb85d0e7f44a25b813f3c828cc3d705d16012..63a1f7501562fa0b5c2fe6ea53dce4d82842bec3 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-etr.c +++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c @@ -1135,11 +1135,21 @@ static void tmc_etr_sync_sysfs_buf(struct tmc_drvdata *drvdata) } } -static void __tmc_etr_disable_hw(struct tmc_drvdata *drvdata) +static int __tmc_etr_disable_hw(struct tmc_drvdata *drvdata) { + int rc; + CS_UNLOCK(drvdata->base); tmc_flush_and_stop(drvdata); + + rc = tmc_wait_for_tmcready(drvdata); + if (rc) { + dev_err(&drvdata->csdev->dev, + "Failed to disable : TMC is not ready\n"); + CS_LOCK(drvdata->base); + return rc; + } /* * When operating in sysFS mode the content of the buffer needs to be * read before the TMC is disabled. @@ -1150,7 +1160,7 @@ static void __tmc_etr_disable_hw(struct tmc_drvdata *drvdata) tmc_disable_hw(drvdata); CS_LOCK(drvdata->base); - + return 0; } void tmc_etr_disable_hw(struct tmc_drvdata *drvdata) @@ -1779,9 +1789,11 @@ int tmc_read_prepare_etr(struct tmc_drvdata *drvdata) } /* Disable the TMC if we are trying to read from a running session. */ - if (coresight_get_mode(drvdata->csdev) == CS_MODE_SYSFS) - __tmc_etr_disable_hw(drvdata); - + if (coresight_get_mode(drvdata->csdev) == CS_MODE_SYSFS) { + ret = __tmc_etr_disable_hw(drvdata); + if (ret) + goto out; + } drvdata->reading = true; out: spin_unlock_irqrestore(&drvdata->spinlock, flags); --- base-commit: fac04efc5c793dccbd07e2d59af9f90b7fc0dca4 change-id: 20250103-fix_cpu_hung-b5a95179ada4 Best regards, -- Yuanfang Zhang <quic_yuanfang(a)quicinc.com>

6 months, 1 week

Re: [RFC v2 08/38] ABI: sysfs-bus-coresight-*: fix kernelversion tags

by Suzuki K Poulose

On 28/01/2025 00:05, Mauro Carvalho Chehab wrote: > Some kernelversion tags are missing colons. Add them to comply with > ABI description and produce right results when converted to html/pdf. > > Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei(a)kernel.org> Acked-by: Suzuki K Poulose <suzuki.poulose(a)arm.com> > --- > .../testing/sysfs-bus-coresight-devices-cti | 78 +++++++++---------- > .../testing/sysfs-bus-coresight-devices-tpdm | 52 ++++++------- > 2 files changed, 65 insertions(+), 65 deletions(-) > > diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-cti b/Documentation/ABI/testing/sysfs-bus-coresight-devices-cti > index bf2869c413e7..a97b70f588da 100644 > --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-cti > +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-cti > @@ -1,241 +1,241 @@ > What: /sys/bus/coresight/devices/<cti-name>/enable > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (RW) Enable/Disable the CTI hardware. > > What: /sys/bus/coresight/devices/<cti-name>/powered > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Read) Indicate if the CTI hardware is powered. > > What: /sys/bus/coresight/devices/<cti-name>/ctmid > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Read) Display the associated CTM ID > > What: /sys/bus/coresight/devices/<cti-name>/nr_trigger_cons > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Read) Number of devices connected to triggers on this CTI > > What: /sys/bus/coresight/devices/<cti-name>/triggers<N>/name > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Read) Name of connected device <N> > > What: /sys/bus/coresight/devices/<cti-name>/triggers<N>/in_signals > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Read) Input trigger signals from connected device <N> > > What: /sys/bus/coresight/devices/<cti-name>/triggers<N>/in_types > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Read) Functional types for the input trigger signals > from connected device <N> > > What: /sys/bus/coresight/devices/<cti-name>/triggers<N>/out_signals > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Read) Output trigger signals to connected device <N> > > What: /sys/bus/coresight/devices/<cti-name>/triggers<N>/out_types > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Read) Functional types for the output trigger signals > to connected device <N> > > What: /sys/bus/coresight/devices/<cti-name>/regs/inout_sel > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (RW) Select the index for inen and outen registers. > > What: /sys/bus/coresight/devices/<cti-name>/regs/inen > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (RW) Read or write the CTIINEN register selected by inout_sel. > > What: /sys/bus/coresight/devices/<cti-name>/regs/outen > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (RW) Read or write the CTIOUTEN register selected by inout_sel. > > What: /sys/bus/coresight/devices/<cti-name>/regs/gate > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (RW) Read or write CTIGATE register. > > What: /sys/bus/coresight/devices/<cti-name>/regs/asicctl > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (RW) Read or write ASICCTL register. > > What: /sys/bus/coresight/devices/<cti-name>/regs/intack > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Write) Write the INTACK register. > > What: /sys/bus/coresight/devices/<cti-name>/regs/appset > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (RW) Set CTIAPPSET register to activate channel. Read back to > determine current value of register. > > What: /sys/bus/coresight/devices/<cti-name>/regs/appclear > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Write) Write APPCLEAR register to deactivate channel. > > What: /sys/bus/coresight/devices/<cti-name>/regs/apppulse > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Write) Write APPPULSE to pulse a channel active for one clock > cycle. > > What: /sys/bus/coresight/devices/<cti-name>/regs/chinstatus > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Read) Read current status of channel inputs. > > What: /sys/bus/coresight/devices/<cti-name>/regs/choutstatus > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Read) read current status of channel outputs. > > What: /sys/bus/coresight/devices/<cti-name>/regs/triginstatus > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Read) read current status of input trigger signals > > What: /sys/bus/coresight/devices/<cti-name>/regs/trigoutstatus > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Read) read current status of output trigger signals. > > What: /sys/bus/coresight/devices/<cti-name>/channels/trigin_attach > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Write) Attach a CTI input trigger to a CTM channel. > > What: /sys/bus/coresight/devices/<cti-name>/channels/trigin_detach > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Write) Detach a CTI input trigger from a CTM channel. > > What: /sys/bus/coresight/devices/<cti-name>/channels/trigout_attach > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Write) Attach a CTI output trigger to a CTM channel. > > What: /sys/bus/coresight/devices/<cti-name>/channels/trigout_detach > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Write) Detach a CTI output trigger from a CTM channel. > > What: /sys/bus/coresight/devices/<cti-name>/channels/chan_gate_enable > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (RW) Enable CTIGATE for single channel (Write) or list enabled > channels through the gate (R). > > What: /sys/bus/coresight/devices/<cti-name>/channels/chan_gate_disable > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Write) Disable CTIGATE for single channel. > > What: /sys/bus/coresight/devices/<cti-name>/channels/chan_set > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Write) Activate a single channel. > > What: /sys/bus/coresight/devices/<cti-name>/channels/chan_clear > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Write) Deactivate a single channel. > > What: /sys/bus/coresight/devices/<cti-name>/channels/chan_pulse > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Write) Pulse a single channel - activate for a single clock cycle. > > What: /sys/bus/coresight/devices/<cti-name>/channels/trigout_filtered > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Read) List of output triggers filtered across all connections. > > What: /sys/bus/coresight/devices/<cti-name>/channels/trig_filter_enable > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (RW) Enable or disable trigger output signal filtering. > > What: /sys/bus/coresight/devices/<cti-name>/channels/chan_inuse > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Read) show channels with at least one attached trigger signal. > > What: /sys/bus/coresight/devices/<cti-name>/channels/chan_free > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Read) show channels with no attached trigger signals. > > What: /sys/bus/coresight/devices/<cti-name>/channels/chan_xtrigs_sel > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (RW) Write channel number to select a channel to view, read to > see selected channel number. > > What: /sys/bus/coresight/devices/<cti-name>/channels/chan_xtrigs_in > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Read) Read to see input triggers connected to selected view > channel. > > What: /sys/bus/coresight/devices/<cti-name>/channels/chan_xtrigs_out > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Read) Read to see output triggers connected to selected view > channel. > > What: /sys/bus/coresight/devices/<cti-name>/channels/chan_xtrigs_reset > Date: March 2020 > -KernelVersion 5.7 > +KernelVersion: 5.7 > Contact: Mike Leach or Mathieu Poirier > Description: (Write) Clear all channel / trigger programming. > diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm > index bf710ea6e0ef..53cb454b60d0 100644 > --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm > +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm > @@ -1,6 +1,6 @@ > What: /sys/bus/coresight/devices/<tpdm-name>/integration_test > Date: January 2023 > -KernelVersion 6.2 > +KernelVersion: 6.2 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (Write) Run integration test for tpdm. Integration test > @@ -14,7 +14,7 @@ Description: > > What: /sys/bus/coresight/devices/<tpdm-name>/reset_dataset > Date: March 2023 > -KernelVersion 6.7 > +KernelVersion: 6.7 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (Write) Reset the dataset of the tpdm. > @@ -24,7 +24,7 @@ Description: > > What: /sys/bus/coresight/devices/<tpdm-name>/dsb_trig_type > Date: March 2023 > -KernelVersion 6.7 > +KernelVersion: 6.7 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (RW) Set/Get the trigger type of the DSB for tpdm. > @@ -35,7 +35,7 @@ Description: > > What: /sys/bus/coresight/devices/<tpdm-name>/dsb_trig_ts > Date: March 2023 > -KernelVersion 6.7 > +KernelVersion: 6.7 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (RW) Set/Get the trigger timestamp of the DSB for tpdm. > @@ -46,7 +46,7 @@ Description: > > What: /sys/bus/coresight/devices/<tpdm-name>/dsb_mode > Date: March 2023 > -KernelVersion 6.7 > +KernelVersion: 6.7 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (RW) Set/Get the programming mode of the DSB for tpdm. > @@ -60,7 +60,7 @@ Description: > > What: /sys/bus/coresight/devices/<tpdm-name>/dsb_edge/ctrl_idx > Date: March 2023 > -KernelVersion 6.7 > +KernelVersion: 6.7 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (RW) Set/Get the index number of the edge detection for the DSB > @@ -69,7 +69,7 @@ Description: > > What: /sys/bus/coresight/devices/<tpdm-name>/dsb_edge/ctrl_val > Date: March 2023 > -KernelVersion 6.7 > +KernelVersion: 6.7 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > Write a data to control the edge detection corresponding to > @@ -85,7 +85,7 @@ Description: > > What: /sys/bus/coresight/devices/<tpdm-name>/dsb_edge/ctrl_mask > Date: March 2023 > -KernelVersion 6.7 > +KernelVersion: 6.7 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > Write a data to mask the edge detection corresponding to the index > @@ -97,21 +97,21 @@ Description: > > What: /sys/bus/coresight/devices/<tpdm-name>/dsb_edge/edcr[0:15] > Date: March 2023 > -KernelVersion 6.7 > +KernelVersion: 6.7 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > Read a set of the edge control value of the DSB in TPDM. > > What: /sys/bus/coresight/devices/<tpdm-name>/dsb_edge/edcmr[0:7] > Date: March 2023 > -KernelVersion 6.7 > +KernelVersion: 6.7 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > Read a set of the edge control mask of the DSB in TPDM. > > What: /sys/bus/coresight/devices/<tpdm-name>/dsb_trig_patt/xpr[0:7] > Date: March 2023 > -KernelVersion 6.7 > +KernelVersion: 6.7 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (RW) Set/Get the value of the trigger pattern for the DSB > @@ -119,7 +119,7 @@ Description: > > What: /sys/bus/coresight/devices/<tpdm-name>/dsb_trig_patt/xpmr[0:7] > Date: March 2023 > -KernelVersion 6.7 > +KernelVersion: 6.7 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (RW) Set/Get the mask of the trigger pattern for the DSB > @@ -127,21 +127,21 @@ Description: > > What: /sys/bus/coresight/devices/<tpdm-name>/dsb_patt/tpr[0:7] > Date: March 2023 > -KernelVersion 6.7 > +KernelVersion: 6.7 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (RW) Set/Get the value of the pattern for the DSB subunit TPDM. > > What: /sys/bus/coresight/devices/<tpdm-name>/dsb_patt/tpmr[0:7] > Date: March 2023 > -KernelVersion 6.7 > +KernelVersion: 6.7 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (RW) Set/Get the mask of the pattern for the DSB subunit TPDM. > > What: /sys/bus/coresight/devices/<tpdm-name>/dsb_patt/enable_ts > Date: March 2023 > -KernelVersion 6.7 > +KernelVersion: 6.7 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (Write) Set the pattern timestamp of DSB tpdm. Read > @@ -153,7 +153,7 @@ Description: > > What: /sys/bus/coresight/devices/<tpdm-name>/dsb_patt/set_type > Date: March 2023 > -KernelVersion 6.7 > +KernelVersion: 6.7 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (Write) Set the pattern type of DSB tpdm. Read > @@ -165,7 +165,7 @@ Description: > > What: /sys/bus/coresight/devices/<tpdm-name>/dsb_msr/msr[0:31] > Date: March 2023 > -KernelVersion 6.7 > +KernelVersion: 6.7 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (RW) Set/Get the MSR(mux select register) for the DSB subunit > @@ -173,7 +173,7 @@ Description: > > What: /sys/bus/coresight/devices/<tpdm-name>/cmb_mode > Date: January 2024 > -KernelVersion 6.9 > +KernelVersion: 6.9 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: (Write) Set the data collection mode of CMB tpdm. Continuous > change creates CMB data set elements on every CMBCLK edge. > @@ -187,7 +187,7 @@ Description: (Write) Set the data collection mode of CMB tpdm. Continuous > > What: /sys/bus/coresight/devices/<tpdm-name>/cmb_trig_patt/xpr[0:1] > Date: January 2024 > -KernelVersion 6.9 > +KernelVersion: 6.9 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (RW) Set/Get the value of the trigger pattern for the CMB > @@ -195,7 +195,7 @@ Description: > > What: /sys/bus/coresight/devices/<tpdm-name>/cmb_trig_patt/xpmr[0:1] > Date: January 2024 > -KernelVersion 6.9 > +KernelVersion: 6.9 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (RW) Set/Get the mask of the trigger pattern for the CMB > @@ -203,21 +203,21 @@ Description: > > What: /sys/bus/coresight/devices/<tpdm-name>/dsb_patt/tpr[0:1] > Date: January 2024 > -KernelVersion 6.9 > +KernelVersion: 6.9 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (RW) Set/Get the value of the pattern for the CMB subunit TPDM. > > What: /sys/bus/coresight/devices/<tpdm-name>/dsb_patt/tpmr[0:1] > Date: January 2024 > -KernelVersion 6.9 > +KernelVersion: 6.9 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (RW) Set/Get the mask of the pattern for the CMB subunit TPDM. > > What: /sys/bus/coresight/devices/<tpdm-name>/cmb_patt/enable_ts > Date: January 2024 > -KernelVersion 6.9 > +KernelVersion: 6.9 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (Write) Set the pattern timestamp of CMB tpdm. Read > @@ -229,7 +229,7 @@ Description: > > What: /sys/bus/coresight/devices/<tpdm-name>/cmb_trig_ts > Date: January 2024 > -KernelVersion 6.9 > +KernelVersion: 6.9 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (RW) Set/Get the trigger timestamp of the CMB for tpdm. > @@ -240,7 +240,7 @@ Description: > > What: /sys/bus/coresight/devices/<tpdm-name>/cmb_ts_all > Date: January 2024 > -KernelVersion 6.9 > +KernelVersion: 6.9 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (RW) Read or write the status of timestamp upon all interface. > @@ -252,7 +252,7 @@ Description: > > What: /sys/bus/coresight/devices/<tpdm-name>/cmb_msr/msr[0:31] > Date: January 2024 > -KernelVersion 6.9 > +KernelVersion: 6.9 > Contact: Jinlong Mao (QUIC) <quic_jinlmao(a)quicinc.com>, Tao Zhang (QUIC) <quic_taozha(a)quicinc.com> > Description: > (RW) Set/Get the MSR(mux select register) for the CMB subunit

6 months, 2 weeks

Re: [PATCH v9 3/6] Coresight: Introduce a new struct coresight_path

by James Clark

On 24/01/2025 7:25 am, Jie Gan wrote: > Add 'struct coresight_path' to store the data that is needed by > coresight_enable_path/coresight_disable_path. The structure > will be transmitted to the helper and sink device to enable > related funcationalities. > > Signed-off-by: Jie Gan <quic_jiegan(a)quicinc.com> > --- [...] > /* > * If we still have access to the event_data via handle, > @@ -595,11 +599,11 @@ static void etm_event_stop(struct perf_event *event, int mode) > if (!csdev) > return; > > - path = etm_event_cpu_path(event_data, cpu); > - if (!path) > + cs_path = etm_event_cpu_path(event_data, cpu); > + if (!cs_path) I don't think renaming 'path' to 'cs_path' is worth the churn. It's in a lot of places in this change, but I think path is already good enough. > return; > > - sink = coresight_get_sink(path); > + sink = coresight_get_sink(cs_path->path); coresight_get_sink() is always called with cs_path->path, so we might as well make it take a whole path struct. The same with any of the other functions that operate on path like coresight_get_source().

6 months, 2 weeks

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