linux-kernel - RE: [PATCH v1 1/3] scsi: ufs: Distinguish between query REQ and query RSP in query trace

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Date:   Mon, 7 Dec 2020 07:45:41 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     Bean Huo <huobean@...il.com>,
        "alim.akhtar@...sung.com" <alim.akhtar@...sung.com>,
        "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "stanley.chu@...iatek.com" <stanley.chu@...iatek.com>,
        "beanhuo@...ron.com" <beanhuo@...ron.com>,
        "bvanassche@....org" <bvanassche@....org>,
        "tomas.winkler@...el.com" <tomas.winkler@...el.com>,
        "cang@...eaurora.org" <cang@...eaurora.org>
CC:     "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "rostedt@...dmis.org" <rostedt@...dmis.org>
Subject: RE: [PATCH v1 1/3] scsi: ufs: Distinguish between query REQ and query
 RSP in query trace

> 
> From: Bean Huo <beanhuo@...ron.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 <beanhuo@...ron.com>
Acked-by: Avri Altman <avri.altman@....com>

But you need to change the complete string so not to break the current parsers.
I would also pass to ufshcd_add_query_upiu_trace the struct utp_upiu_req *, 
so no comparison is needed.

Thanks,
Avri

> ---
>  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;
> +
> +       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,
> --
> 2.17.1