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Message-ID: <MWHPR04MB1137DA8E5CFDC79A018588E09AAA0@MWHPR04MB1137.namprd04.prod.outlook.com>
Date: Wed, 21 Mar 2018 15:55:27 +0000
From: Stanislav Nijnikov <Stanislav.Nijnikov@....com>
To: "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] scsi: ufs: add trace event for ufs upiu
-----Original Message-----
From: Stanislav Nijnikov
Sent: Wednesday, March 21, 2018 2:24 PM
To: Ohad Sharabi <Ohad.Sharabi@....com>; James E.J. Bottomley <jejb@...ux.vnet.ibm.com>; Martin K. Petersen <martin.petersen@...cle.com>; gregkh@...uxfoundation.org
Cc: Alex Lemberg <Alex.Lemberg@....com>; Ohad Sharabi <Ohad.Sharabi@....com>
Subject: Re: {PATCH} ] scsi: ufs: add trace event for ufs upiu
> -----Original Message-----
> From: Ohad Sharabi [mailto:ohad.sharabi@...disk.com]
> Sent: Tuesday, February 20, 2018 4:35 PM
> James E.J. Bottomley <jejb@...ux.vnet.ibm.com>;
> To: Martin K. Petersen <martin.petersen@...cle.com>; Greg KH
> < gregkh@...uxfoundation.org>; linux-scsi@...r.kernel.org;
> linux-kernel@...r.kernel.org
> Cc: Alex Lemberg <Alex.Lemberg@....com>; Ohad Sharabi
> <ohad.sharabi@...disk.com>
> Subject: [PATCH] ] scsi: ufs: add trace event for ufs upiu
>
> Add UFS Protocol Information Units(upiu) trace events for ufs driver,
> used to trace various ufs transaction types- command, task-management
> and device management.
> The trace-point format is generic and can be easily adapted to trace
> other upius if needed.
> Currently tracing ufs transaction of type 'device management', which
> this patch introduce, cannot be obtained from any other trace.
> Device management transactions are used for communication with the
> device such as reading and writing descriptor or attributes etc.
>
> Signed-off-by: Ohad Sharabi <ohad.sharabi@...disk.com>
> ---
> drivers/scsi/ufs/ufshcd.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++
> include/trace/events/ufs.h | 28 +++++++++++++++++++++++++++
> 2 files changed, 76 insertions(+)
>
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index a355d98..6d79c99 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -274,6 +274,47 @@ static inline void ufshcd_remove_non_printable(char *val)
> *val = ' ';
> }
>
> +static void ufshcd_add_upiu_trace(struct ufs_hba *hba, unsigned int tag,
> + const char *str)
> +{
> + struct utp_task_req_desc *descp;
> + struct utp_upiu_task_req *task_req;
> + struct utp_upiu_req *rq;
> + u8 tx_code, *hdr, *tsf;
> + int off;
> +
> + if (!trace_ufshcd_upiu_enabled())
> + return;
> +
> + off = (int)tag - hba->nutrs;
> + if (off < 0) {
> + rq = hba->lrb[tag].ucd_req_ptr;
> + hdr = (u8 *)&rq->header;
> + } else {
> + descp = &hba->utmrdl_base_addr[off];
> + task_req = (struct utp_upiu_task_req *)descp->task_req_upiu;
> + hdr = (u8 *)&task_req->header;
> + }
> +
> + tx_code = hdr[0] & 0x3f;
The tx_code variable is not used.
Please combine the if and switch code, otherwise Sparse gives warnings that rq and task_req could be not initialized.
> + switch (hdr[0] & 0x3f) {
> + case UPIU_TRANSACTION_COMMAND:
> + tsf = (u8 *)&rq->sc.cdb;
> + break;
> + case UPIU_TRANSACTION_TASK_REQ:
> + tsf = (u8 *)&task_req->input_param1;
> + break;
> + case UPIU_TRANSACTION_QUERY_REQ:
Is this case used ATM?
> + tsf = (u8 *)&rq->qr;
> + break;
> + default:
> + return;
> + }
> +
> + /* trace UPIU header and Transaction Specific Fields (TSF) */
> + trace_ufshcd_upiu(dev_name(hba->dev), str, hdr, tsf);
> +}
> +
> static void ufshcd_add_command_trace(struct ufs_hba *hba,
> unsigned int tag, const char *str)
> {
> @@ -283,6 +324,9 @@ static void ufshcd_add_command_trace(struct ufs_hba *hba,
> struct ufshcd_lrb *lrbp;
> int transfer_len = -1;
>
> + /* trace UPIU also */
> + ufshcd_add_upiu_trace(hba, tag, str);
> +
> if (!trace_ufshcd_command_enabled())
> return;
>
> @@ -5462,11 +5506,14 @@ static int ufshcd_issue_tm_cmd(struct ufs_hba *hba, int lun_id, int task_id,
>
> spin_unlock_irqrestore(host->host_lock, flags);
>
> + ufshcd_add_upiu_trace(hba, task_tag, "tm_send");
> +
> /* wait until the task management command is completed */
> err = wait_event_timeout(hba->tm_wq,
> test_bit(free_slot, &hba->tm_condition),
> msecs_to_jiffies(TM_CMD_TIMEOUT));
> if (!err) {
> + ufshcd_add_upiu_trace(hba, task_tag, "tm_complete_err");
> dev_err(hba->dev, "%s: task management cmd 0x%.2x timed-out\n",
> __func__, tm_function);
> if (ufshcd_clear_tm_cmd(hba, free_slot))
> @@ -5475,6 +5522,7 @@ static int ufshcd_issue_tm_cmd(struct ufs_hba *hba, int lun_id, int task_id,
> err = -ETIMEDOUT;
> } else {
> err = ufshcd_task_req_compl(hba, free_slot, tm_response);
> + ufshcd_add_upiu_trace(hba, task_tag, "tm_complete");
> }
>
> clear_bit(free_slot, &hba->tm_condition);
> diff --git a/include/trace/events/ufs.h b/include/trace/events/ufs.h
> index bf6f826..0b2ff5d 100644
> --- a/include/trace/events/ufs.h
> +++ b/include/trace/events/ufs.h
> @@ -257,6 +257,34 @@
> )
> );
>
> +TRACE_EVENT(ufshcd_upiu,
> + TP_PROTO(const char *dev_name, const char *str, unsigned char *hdr,
> + unsigned char *tsf),
> +
> + TP_ARGS(dev_name, str, hdr, tsf),
> +
> + TP_STRUCT__entry(
> + __string(dev_name, dev_name)
> + __string(str, str)
> + __array(unsigned char, hdr, 12)
> + __array(unsigned char, tsf, 16)
> + ),
> +
> + TP_fast_assign(
> + __assign_str(dev_name, dev_name);
> + __assign_str(str, str);
> + memcpy(__entry->hdr, hdr, sizeof(__entry->hdr));
> + memcpy(__entry->tsf, tsf, sizeof(__entry->tsf));
> + ),
> +
> + TP_printk(
> + "%s: %s: HDR:%s, CDB:%s",
> + __get_str(str), __get_str(dev_name),
> + __print_hex(__entry->hdr, sizeof(__entry->hdr)),
> + __print_hex(__entry->tsf, sizeof(__entry->tsf))
> + )
> +);
> +
> #endif /* if !defined(_TRACE_UFS_H) || defined(TRACE_HEADER_MULTI_READ) */
>
> /* This part must be outside protection */
> --
> 1.9.1
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