linux-kernel - Re: [PATCH v1 3/3] scsi: ufs: Make UPIU trace easier differentiate among CDB, OSF, and TM

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Date:   Tue, 08 Dec 2020 22:36:46 +0100
From:   Bean Huo <huobean@...il.com>
To:     Steven Rostedt <rostedt@...dmis.org>, bvanassche@....org
Cc:     alim.akhtar@...sung.com, avri.altman@....com,
        asutoshd@...eaurora.org, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, stanley.chu@...iatek.com,
        beanhuo@...ron.com, bvanassche@....org, tomas.winkler@...el.com,
        cang@...eaurora.org, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 3/3] scsi: ufs: Make UPIU trace easier differentiate
 among CDB, OSF, and TM

On Mon, 2020-12-07 at 10:34 -0500, Steven Rostedt wrote:
> On Sun,  6 Dec 2020 17:42:26 +0100
> Bean Huo <huobean@...il.com> wrote:
> 
> > From: Bean Huo <beanhuo@...ron.com>
> > 
> > Transaction Specific Fields (TSF) in the UPIU package could be CDB
> > (SCSI/UFS Command Descriptor Block), OSF (Opcode Specific Field),
> > and
> > TM I/O parameter (Task Management Input/Output Parameter). But,
> > currently,
> > we take all of these as CDB  in the UPIU trace. Thus makes user
> > confuse
> > among CDB, OSF, and TM message. So fix it with this patch.
> > 
> > Signed-off-by: Bean Huo <beanhuo@...ron.com>
> > ---
> >  drivers/scsi/ufs/ufshcd.c  |  9 +++++----
> >  include/trace/events/ufs.h | 10 +++++++---
> >  2 files changed, 12 insertions(+), 7 deletions(-)
> > 
> > diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> > index 29d7240a61bf..5b2219e44743 100644
> > --- a/drivers/scsi/ufs/ufshcd.c
> > +++ b/drivers/scsi/ufs/ufshcd.c
> > @@ -315,7 +315,8 @@ static void ufshcd_add_cmd_upiu_trace(struct
> > ufs_hba *hba, unsigned int tag,
> >  {
> >  	struct utp_upiu_req *rq = hba->lrb[tag].ucd_req_ptr;
> >  
> > -	trace_ufshcd_upiu(dev_name(hba->dev), str, &rq->header, &rq-
> > >sc.cdb);
> > +	trace_ufshcd_upiu(dev_name(hba->dev), str, &rq->header, &rq-
> > >sc.cdb,
> > +			  "CDB");
> >  }
> >  
> >  static void ufshcd_add_query_upiu_trace(struct ufs_hba *hba,
> > unsigned int tag,
> > @@ -329,7 +330,7 @@ static void ufshcd_add_query_upiu_trace(struct
> > ufs_hba *hba, unsigned int tag,
> >  		rq_rsp = (struct utp_upiu_req *)hba-
> > >lrb[tag].ucd_rsp_ptr;
> >  
> >  	trace_ufshcd_upiu(dev_name(hba->dev), str, &rq_rsp->header,
> > -			  &rq_rsp->qr);
> > +			  &rq_rsp->qr, "OSF");
> >  }
> >  
> >  static void ufshcd_add_tm_upiu_trace(struct ufs_hba *hba, unsigned
> > int tag,
> > @@ -340,10 +341,10 @@ static void ufshcd_add_tm_upiu_trace(struct
> > ufs_hba *hba, unsigned int tag,
> >  
> >  	if (!strcmp("tm_send", str))
> >  		trace_ufshcd_upiu(dev_name(hba->dev), str, &descp-
> > >req_header,
> > -				  &descp->input_param1);
> > +				  &descp->input_param1, "TM_INPUT");
> >  	else
> >  		trace_ufshcd_upiu(dev_name(hba->dev), str, &descp-
> > >rsp_header,
> > -				  &descp->output_param1);
> > +				  &descp->output_param1, "TM_OUTPUT");
> 
> You could save some space on the ring buffer, if you made the above
> into an
> enum, and then used print_symbolic().
> 
> >  }
> >  
> >  static void ufshcd_add_uic_command_trace(struct ufs_hba *hba,
> > diff --git a/include/trace/events/ufs.h
> > b/include/trace/events/ufs.h
> > index 0bd54a184391..68e8e97a9b47 100644
> > --- a/include/trace/events/ufs.h
> > +++ b/include/trace/events/ufs.h
> > @@ -295,15 +295,17 @@ TRACE_EVENT(ufshcd_uic_command,
> >  );
> 
> 
> You could make this:
> 
> #define TRACE_TSF_TYPES		\
> 	EM(CDB)			\
> 	EM(OSF)			\
> 	EM(TM_INPUT)		\
> 	EMe(TM_OUTPUT)
> 
> #ifndef TRACE_TSF_TYPES_ENUMS
> #define TRACE_TSF_TYPES_ENUMS
> #undef EM
> #undef EMe
> 
> #define EM(x)	TRACE_TSF_##x,
> #define EMe(x)	TRACE_TSF_##x
> 
> enum {
> 	TRACE_TSF_TYPES
> }
> #endif /* TRACE_TSF_TYPES_ENUMS */
> 
> #undef EM
> #undef EMe
> 
> /* These export the enum names to user space */
> #define EM(x)	TRACE_DEFINE_ENUM(TRACE_TSF_##x)
> #define EMe(x)	TRACE_DEFINE_ENUM(TRACE_TSF_##x)
> 
> TRACE_TSF_TYPES
> 
> #undef EM
> #undef EMe
> 
> /* These are used in the print_symbolic */
> #define EM(x) { TRACE_TSF_##x, #x },
> #define EMe(x) { TRACE_TSF_##x, #x }
> 
> 
> >  
> >  TRACE_EVENT(ufshcd_upiu,
> > -	TP_PROTO(const char *dev_name, const char *str, void *hdr, void
> > *tsf),
> > +	TP_PROTO(const char *dev_name, const char *str, void *hdr, void
> > *tsf,
> > +		 const char *tsf_type),
> 
> 		int tsf_type;
> 
> >  
> > -	TP_ARGS(dev_name, str, hdr, tsf),
> > +	TP_ARGS(dev_name, str, hdr, tsf, tsf_type),
> >  
> >  	TP_STRUCT__entry(
> >  		__string(dev_name, dev_name)
> >  		__string(str, str)
> >  		__array(unsigned char, hdr, 12)
> >  		__array(unsigned char, tsf, 16)
> > +		__string(tsf_type, tsf_type)
> 
> 		__field(int, tsf_type)
> 
> >  	),
> >  
> >  	TP_fast_assign(
> > @@ -311,12 +313,14 @@ TRACE_EVENT(ufshcd_upiu,
> >  		__assign_str(str, str);
> >  		memcpy(__entry->hdr, hdr, sizeof(__entry->hdr));
> >  		memcpy(__entry->tsf, tsf, sizeof(__entry->tsf));
> > +		__assign_str(tsf_type, tsf_type);
> 
> 
> 		__entry->tsf_type = tsf_type;
> 
> 
> >  	),
> >  
> >  	TP_printk(
> > -		"%s: %s: HDR:%s, CDB:%s",
> > +		"%s: %s: HDR:%s, %s:%s",
> >  		__get_str(str), __get_str(dev_name),
> >  		__print_hex(__entry->hdr, sizeof(__entry->hdr)),
> > +		__get_str(tsf_type),
> 
> 		print_symbolic(tsf_type, TRACE_TSF_TYPES),
> 
> -- Steve
> 
> 
> >  		__print_hex(__entry->tsf, sizeof(__entry->tsf))
> >  	)
> >  );
> 
> 

Thanks Bart and Steve,
That's nice, I will change them in the next version.

Bean