On Sun, 6 Dec 2020 17:42:24 +0100
Bean Huo <huob...@gmail.com> wrote:
> From: Bean Huo <bean...@micron.com>
>
> Currently, in the query completion trace print, since we use
> hba->lrb[tag].ucd_req_ptr and didn't differentiate UPIU between
> request and response, thus header and transaction-specific field
> in UPIU printed by query trace are identical. This is not very
> practical. As below:
>
> query_send: HDR:16 00 00 0e 00 81 00 00 00 00 00 00, CDB:06 0e 03 00 00 00 00
> 00 00 00 00 00 00 00 00 00
> query_complete: HDR:16 00 00 0e 00 81 00 00 00 00 00 00, CDB:06 0e 03 00 00
> 00 00 00 00 00 00 00 00 00 00 00
>
> For the failure analysis, we want to understand the real response
> reported by the UFS device, however, the current query trace tells
> us nothing. After this patch, the query trace on the query_send, and
> the above a pair of query_send and query_complete will be:
>
> query_send: HDR:16 00 00 0e 00 81 00 00 00 00 00 00, CDB:06 0e 03 00 00 00 00
> 00 00 00 00 00 00 00 00 00
> ufshcd_upiu: HDR:36 00 00 0e 00 81 00 00 00 00 00 00, CDB:06 0e 03 00 00 00
> 00 00 00 00 00 01 00 00 00 00
>
> Signed-off-by: Bean Huo <bean...@micron.com>
> ---
> drivers/scsi/ufs/ufshcd.c | 10 ++++++++--
> 1 file changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index ceb562accc39..e10de94adb3f 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -321,9 +321,15 @@ static void ufshcd_add_cmd_upiu_trace(struct ufs_hba
> *hba, unsigned int tag,
> static void ufshcd_add_query_upiu_trace(struct ufs_hba *hba, unsigned int
> tag,
> const char *str)
> {
> - struct utp_upiu_req *rq = hba->lrb[tag].ucd_req_ptr;
> + struct utp_upiu_req *rq_rsp;
> +
I would add:
if (!trace_ufshcd_upiu_enabled())
return;
Why do the work if the trace point is not enabled?
-- Steve
> + if (!strcmp("query_send", str))
> + rq_rsp = hba->lrb[tag].ucd_req_ptr;
> + else
> + rq_rsp = (struct utp_upiu_req *)hba->lrb[tag].ucd_rsp_ptr;
>
> - trace_ufshcd_upiu(dev_name(hba->dev), str, &rq->header, &rq->qr);
> + trace_ufshcd_upiu(dev_name(hba->dev), str, &rq_rsp->header,
> + &rq_rsp->qr);
> }
>
> static void ufshcd_add_tm_upiu_trace(struct ufs_hba *hba, unsigned int tag,
