[v2] Coresight TMC-ETR some bugfixes and cleanups

[PATCH v2 1/3] coresight: tmc: Add missing doc of tmc_drvdata::reading

Posted by Junhao He 3 months, 2 weeks ago

From: Yicong Yang <yangyicong@hisilicon.com>

tmc_drvdata::reading is used to indicate whether a reading process
is performed through /dev/xyz.tmc. Document it.

Reviewed-by: James Clark <james.clark@linaro.org>
Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
Signed-off-by: Junhao He <hejunhao3@huawei.com>
---
 drivers/hwtracing/coresight/coresight-tmc.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/hwtracing/coresight/coresight-tmc.h b/drivers/hwtracing/coresight/coresight-tmc.h
index 6541a27a018e..3ca0d40c580d 100644
--- a/drivers/hwtracing/coresight/coresight-tmc.h
+++ b/drivers/hwtracing/coresight/coresight-tmc.h
@@ -220,6 +220,7 @@ struct tmc_resrv_buf {
  * @pid:	Process ID of the process that owns the session that is using
  *		this component. For example this would be the pid of the Perf
  *		process.
+ * @reading:	buffer's in the reading through "/dev/xyz.tmc" entry
  * @stop_on_flush: Stop on flush trigger user configuration.
  * @buf:	Snapshot of the trace data for ETF/ETB.
  * @etr_buf:	details of buffer used in TMC-ETR
-- 
2.33.0

Re: [PATCH v2 1/3] coresight: tmc: Add missing doc of tmc_drvdata::reading

Posted by Leo Yan 3 months, 1 week ago

On Fri, Jun 20, 2025 at 03:54:10PM +0800, Junhao He wrote:
> From: Yicong Yang <yangyicong@hisilicon.com>
> 
> tmc_drvdata::reading is used to indicate whether a reading process
> is performed through /dev/xyz.tmc. Document it.
> 
> Reviewed-by: James Clark <james.clark@linaro.org>
> Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
> Signed-off-by: Junhao He <hejunhao3@huawei.com>
> ---
>  drivers/hwtracing/coresight/coresight-tmc.h | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/hwtracing/coresight/coresight-tmc.h b/drivers/hwtracing/coresight/coresight-tmc.h
> index 6541a27a018e..3ca0d40c580d 100644
> --- a/drivers/hwtracing/coresight/coresight-tmc.h
> +++ b/drivers/hwtracing/coresight/coresight-tmc.h
> @@ -220,6 +220,7 @@ struct tmc_resrv_buf {
>   * @pid:	Process ID of the process that owns the session that is using
>   *		this component. For example this would be the pid of the Perf
>   *		process.
> + * @reading:	buffer's in the reading through "/dev/xyz.tmc" entry

Are you working on the latest code base? For example, the mainline
kernel or coresight next branch.

The latest code already has comment for reading, and I saw a duplicated
"reading" field in tmc_drvdata.

The tmc_resrv_buf structure does not have the fields "pid",
"stop_on_flush", "buf", etc. They have been moved into the tmc_drvdata
structure.

Thanks,
Leo

>   * @stop_on_flush: Stop on flush trigger user configuration.
>   * @buf:	Snapshot of the trace data for ETF/ETB.
>   * @etr_buf:	details of buffer used in TMC-ETR
> -- 
> 2.33.0
>

Re: [PATCH v2 1/3] coresight: tmc: Add missing doc of tmc_drvdata::reading

Posted by hejunhao 2 months, 3 weeks ago

On 2025/7/2 23:27, Leo Yan wrote:
> On Fri, Jun 20, 2025 at 03:54:10PM +0800, Junhao He wrote:
>> From: Yicong Yang <yangyicong@hisilicon.com>
>>
>> tmc_drvdata::reading is used to indicate whether a reading process
>> is performed through /dev/xyz.tmc. Document it.
>>
>> Reviewed-by: James Clark <james.clark@linaro.org>
>> Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
>> Signed-off-by: Junhao He <hejunhao3@huawei.com>
>> ---
>>   drivers/hwtracing/coresight/coresight-tmc.h | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/hwtracing/coresight/coresight-tmc.h b/drivers/hwtracing/coresight/coresight-tmc.h
>> index 6541a27a018e..3ca0d40c580d 100644
>> --- a/drivers/hwtracing/coresight/coresight-tmc.h
>> +++ b/drivers/hwtracing/coresight/coresight-tmc.h
>> @@ -220,6 +220,7 @@ struct tmc_resrv_buf {
>>    * @pid:	Process ID of the process that owns the session that is using
>>    *		this component. For example this would be the pid of the Perf
>>    *		process.
>> + * @reading:	buffer's in the reading through "/dev/xyz.tmc" entry
> Are you working on the latest code base? For example, the mainline
> kernel or coresight next branch.
> The latest code already has comment for reading, and I saw a duplicated
> "reading" field in tmc_drvdata.

This patch is based on mainline kernel v6.16-rc1, and adds a comment to 
struct tmc_drvdata::reading.
Perhaps, this git log could easily be misunderstood as adding comments 
to tmc_resrv_buf::reading.

> The tmc_resrv_buf structure does not have the fields "pid",
> "stop_on_flush", "buf", etc. They have been moved into the tmc_drvdata
> structure.
>
> Thanks,
> Leo
>
>>    * @stop_on_flush: Stop on flush trigger user configuration.
>>    * @buf:	Snapshot of the trace data for ETF/ETB.
>>    * @etr_buf:	details of buffer used in TMC-ETR
>> -- 
>> 2.33.0
>>
> _______________________________________________
> CoreSight mailing list -- coresight@lists.linaro.org
> To unsubscribe send an email to coresight-leave@lists.linaro.org
> .
>

Re: [PATCH v2 1/3] coresight: tmc: Add missing doc of tmc_drvdata::reading

Posted by Jonathan Cameron 3 months, 2 weeks ago

On Fri, 20 Jun 2025 15:54:10 +0800
Junhao He <hejunhao3@huawei.com> wrote:

> From: Yicong Yang <yangyicong@hisilicon.com>
> 
> tmc_drvdata::reading is used to indicate whether a reading process
> is performed through /dev/xyz.tmc. Document it.
> 
> Reviewed-by: James Clark <james.clark@linaro.org>
> Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
> Signed-off-by: Junhao He <hejunhao3@huawei.com>
> ---
>  drivers/hwtracing/coresight/coresight-tmc.h | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/hwtracing/coresight/coresight-tmc.h b/drivers/hwtracing/coresight/coresight-tmc.h
> index 6541a27a018e..3ca0d40c580d 100644
> --- a/drivers/hwtracing/coresight/coresight-tmc.h
> +++ b/drivers/hwtracing/coresight/coresight-tmc.h
> @@ -220,6 +220,7 @@ struct tmc_resrv_buf {
>   * @pid:	Process ID of the process that owns the session that is using
>   *		this component. For example this would be the pid of the Perf
>   *		process.
> + * @reading:	buffer's in the reading through "/dev/xyz.tmc" entry
Hi,

Perhaps reword:

"buffer is being read through "/dev/xyz.tmc" entry" or
"buffer read in progress through "/dev/xyz.tmc" entry"

I've not checked what this actually means - just looking at what you have here.

>   * @stop_on_flush: Stop on flush trigger user configuration.
>   * @buf:	Snapshot of the trace data for ETF/ETB.
>   * @etr_buf:	details of buffer used in TMC-ETR

Re: [PATCH v2 1/3] coresight: tmc: Add missing doc of tmc_drvdata::reading

Posted by hejunhao 3 months, 1 week ago


On 2025/6/20 19:53, Jonathan Cameron wrote:
> On Fri, 20 Jun 2025 15:54:10 +0800
> Junhao He <hejunhao3@huawei.com> wrote:
>
>> From: Yicong Yang <yangyicong@hisilicon.com>
>>
>> tmc_drvdata::reading is used to indicate whether a reading process
>> is performed through /dev/xyz.tmc. Document it.
>>
>> Reviewed-by: James Clark <james.clark@linaro.org>
>> Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
>> Signed-off-by: Junhao He <hejunhao3@huawei.com>
>> ---
>>   drivers/hwtracing/coresight/coresight-tmc.h | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/hwtracing/coresight/coresight-tmc.h b/drivers/hwtracing/coresight/coresight-tmc.h
>> index 6541a27a018e..3ca0d40c580d 100644
>> --- a/drivers/hwtracing/coresight/coresight-tmc.h
>> +++ b/drivers/hwtracing/coresight/coresight-tmc.h
>> @@ -220,6 +220,7 @@ struct tmc_resrv_buf {
>>    * @pid:	Process ID of the process that owns the session that is using
>>    *		this component. For example this would be the pid of the Perf
>>    *		process.
>> + * @reading:	buffer's in the reading through "/dev/xyz.tmc" entry
> Hi,
>
> Perhaps reword:
>
> "buffer is being read through "/dev/xyz.tmc" entry" or
> "buffer read in progress through "/dev/xyz.tmc" entry"
>
> I've not checked what this actually means - just looking at what you have here.

Will update this. Thanks

Best regards,
Junhao.

>>    * @stop_on_flush: Stop on flush trigger user configuration.
>>    * @buf:	Snapshot of the trace data for ETF/ETB.
>>    * @etr_buf:	details of buffer used in TMC-ETR
> .
>