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SubjectRe: [PATCH v4 2/2] coresight: Update comments for removing cs_etm_find_snapshot()
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On 12/09/2021 13:57, Leo Yan wrote:
> Commit 2f01c200d440 ("perf cs-etm: Remove callback cs_etm_find_snapshot()")
> has removed the function cs_etm_find_snapshot() from the perf tool in the
> user space, now CoreSight trace directly uses the perf common function
> __auxtrace_mmap__read() to calcualte the head and size for AUX trace data
> in snapshot mode.
>
> This patch updates the comments in drivers to make them generic and not
> stick to any specific function from perf tool.
>
> Signed-off-by: Leo Yan <leo.yan@linaro.org>
> ---
> drivers/hwtracing/coresight/coresight-etb10.c | 5 ++---
> drivers/hwtracing/coresight/coresight-tmc-etf.c | 5 ++---
> drivers/hwtracing/coresight/coresight-tmc-etr.c | 5 ++---
> 3 files changed, 6 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c
> index f775cbee12b8..efa39820acec 100644
> --- a/drivers/hwtracing/coresight/coresight-etb10.c
> +++ b/drivers/hwtracing/coresight/coresight-etb10.c
> @@ -557,9 +557,8 @@ static unsigned long etb_update_buffer(struct coresight_device *csdev,
>
> /*
> * In snapshot mode we simply increment the head by the number of byte
> - * that were written. User space function cs_etm_find_snapshot() will
> - * figure out how many bytes to get from the AUX buffer based on the
> - * position of the head.
> + * that were written. User space will figure out how many bytes to get
> + * from the AUX buffer based on the position of the head.
> */
> if (buf->snapshot)
> handle->head += to_read;
> diff --git a/drivers/hwtracing/coresight/coresight-tmc-etf.c b/drivers/hwtracing/coresight/coresight-tmc-etf.c
> index cd0fb7bfba68..b416b1951d3e 100644
> --- a/drivers/hwtracing/coresight/coresight-tmc-etf.c
> +++ b/drivers/hwtracing/coresight/coresight-tmc-etf.c
> @@ -546,9 +546,8 @@ static unsigned long tmc_update_etf_buffer(struct coresight_device *csdev,
>
> /*
> * In snapshot mode we simply increment the head by the number of byte
> - * that were written. User space function cs_etm_find_snapshot() will
> - * figure out how many bytes to get from the AUX buffer based on the
> - * position of the head.
> + * that were written. User space will figure out how many bytes to get
> + * from the AUX buffer based on the position of the head.
> */
> if (buf->snapshot)
> handle->head += to_read;
> diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c
> index d23c7690f29a..ce14eb83925c 100644
> --- a/drivers/hwtracing/coresight/coresight-tmc-etr.c
> +++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c
> @@ -1573,9 +1573,8 @@ tmc_update_etr_buffer(struct coresight_device *csdev,
>
> /*
> * In snapshot mode we simply increment the head by the number of byte
> - * that were written. User space function cs_etm_find_snapshot() will
> - * figure out how many bytes to get from the AUX buffer based on the
> - * position of the head.
> + * that were written. User space will figure out how many bytes to get
> + * from the AUX buffer based on the position of the head.
> */
> if (etr_perf->snapshot)
> handle->head += size;
>


Thanks for the revised patch, I have queued both the patches.

Kind regards
Suzuki

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