Re: [PATCH 39/46] libata: add tracepoints for ATA error handling

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On 2/4/20 5:55 PM, Hannes Reinecke wrote:
> Add tracepoints for ATA error handling, and remove the related
> DPRINTK() calls.
> 
> Signed-off-by: Hannes Reinecke <hare@xxxxxxx>

Please move the removal to a separate (post-)patch
(like it has been done for reset tracepoints).

Also there is a lot of complaints from checkpatch.pl script
regarding CodingStyle:

WARNING: line over 80 characters
#259: FILE: include/trace/events/libata.h:459:
+       TP_PROTO(struct ata_link *link, unsigned int devno, unsigned int eh_action),

ERROR: space prohibited after that open parenthesis '('
#264: FILE: include/trace/events/libata.h:464:
+               __field( unsigned int,  ata_port )

ERROR: space prohibited before that close parenthesis ')'
#264: FILE: include/trace/events/libata.h:464:
+               __field( unsigned int,  ata_port )

ERROR: space prohibited after that open parenthesis '('
#265: FILE: include/trace/events/libata.h:465:
+               __field( unsigned int,  ata_dev )

ERROR: space prohibited before that close parenthesis ')'
#265: FILE: include/trace/events/libata.h:465:
+               __field( unsigned int,  ata_dev )

ERROR: space prohibited after that open parenthesis '('
#266: FILE: include/trace/events/libata.h:466:
+               __field( unsigned int,  eh_action )

ERROR: space prohibited before that close parenthesis ')'
#266: FILE: include/trace/events/libata.h:466:
+               __field( unsigned int,  eh_action )

WARNING: line over 80 characters
#281: FILE: include/trace/events/libata.h:481:
+            TP_PROTO(struct ata_link *link, unsigned int devno, unsigned int eh_action),

WARNING: line over 80 characters
#285: FILE: include/trace/events/libata.h:485:
+            TP_PROTO(struct ata_link *link, unsigned int devno, unsigned int eh_action),

ERROR: space prohibited after that open parenthesis '('
#302: FILE: include/trace/events/libata.h:575:
+               __field( unsigned int,  ata_port )

ERROR: space prohibited before that close parenthesis ')'
#302: FILE: include/trace/events/libata.h:575:
+               __field( unsigned int,  ata_port )

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics

> ---
>  drivers/ata/libata-eh.c       | 22 +++++-----------
>  drivers/ata/libata-pmp.c      |  8 ------
>  include/trace/events/libata.h | 60 +++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 67 insertions(+), 23 deletions(-)
> 
> diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
> index ef3576eb5874..f37dad5f9c17 100644
> --- a/drivers/ata/libata-eh.c
> +++ b/drivers/ata/libata-eh.c
> @@ -526,8 +526,6 @@ void ata_scsi_error(struct Scsi_Host *host)
>  	unsigned long flags;
>  	LIST_HEAD(eh_work_q);
>  
> -	DPRINTK("ENTER\n");
> -
>  	spin_lock_irqsave(host->host_lock, flags);
>  	list_splice_init(&host->eh_cmd_q, &eh_work_q);
>  	spin_unlock_irqrestore(host->host_lock, flags);
> @@ -541,7 +539,6 @@ void ata_scsi_error(struct Scsi_Host *host)
>  	/* finish or retry handled scmd's and clean up */
>  	WARN_ON(!list_empty(&eh_work_q));
>  
> -	DPRINTK("EXIT\n");
>  }
>  
>  /**
> @@ -933,7 +930,7 @@ void ata_std_sched_eh(struct ata_port *ap)
>  	ata_eh_set_pending(ap, 1);
>  	scsi_schedule_eh(ap->scsi_host);
>  
> -	DPRINTK("port EH scheduled\n");
> +	trace_ata_std_sched_eh(ap);
>  }
>  EXPORT_SYMBOL_GPL(ata_std_sched_eh);
>  
> @@ -1060,7 +1057,7 @@ static void __ata_port_freeze(struct ata_port *ap)
>  
>  	ap->pflags |= ATA_PFLAG_FROZEN;
>  
> -	DPRINTK("ata%u port frozen\n", ap->print_id);
> +	trace_ata_port_freeze(ap);
>  }
>  
>  /**
> @@ -1208,7 +1205,7 @@ void ata_eh_thaw_port(struct ata_port *ap)
>  
>  	spin_unlock_irqrestore(ap->lock, flags);
>  
> -	DPRINTK("ata%u port thawed\n", ap->print_id);
> +	trace_ata_port_thaw(ap);
>  }
>  
>  static void ata_eh_scsidone(struct scsi_cmnd *scmd)
> @@ -1347,6 +1344,8 @@ void ata_eh_about_to_do(struct ata_link *link, struct ata_device *dev,
>  	struct ata_eh_context *ehc = &link->eh_context;
>  	unsigned long flags;
>  
> +	trace_ata_eh_about_to_do(link, dev ? dev->devno : 0, action);
> +
>  	spin_lock_irqsave(ap->lock, flags);
>  
>  	ata_eh_clear_action(link, dev, ehi, action);
> @@ -1377,6 +1376,8 @@ void ata_eh_done(struct ata_link *link, struct ata_device *dev,
>  {
>  	struct ata_eh_context *ehc = &link->eh_context;
>  
> +	trace_ata_eh_done(link, dev ? dev->devno : 0, action);
> +
>  	ata_eh_clear_action(link, dev, &ehc->i, action);
>  }
>  
> @@ -2119,8 +2120,6 @@ static void ata_eh_link_autopsy(struct ata_link *link)
>  	u32 serror;
>  	int rc;
>  
> -	DPRINTK("ENTER\n");
> -
>  	if (ehc->i.flags & ATA_EHI_NO_AUTOPSY)
>  		return;
>  
> @@ -2227,7 +2226,6 @@ static void ata_eh_link_autopsy(struct ata_link *link)
>  		ehc->i.action |= ata_eh_speed_down(dev, eflags, all_err_mask);
>  		trace_ata_eh_link_autopsy(dev, ehc->i.action, all_err_mask);
>  	}
> -	DPRINTK("EXIT\n");
>  }
>  
>  /**
> @@ -3126,8 +3124,6 @@ static int ata_eh_revalidate_and_attach(struct ata_link *link,
>  	unsigned long flags;
>  	int rc = 0;
>  
> -	DPRINTK("ENTER\n");
> -
>  	/* For PATA drive side cable detection to work, IDENTIFY must
>  	 * be done backwards such that PDIAG- is released by the slave
>  	 * device before the master device is identified.
> @@ -3241,7 +3237,6 @@ static int ata_eh_revalidate_and_attach(struct ata_link *link,
>  
>   err:
>  	*r_failed_dev = dev;
> -	DPRINTK("EXIT rc=%d\n", rc);
>  	return rc;
>  }
>  
> @@ -3755,8 +3750,6 @@ int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset,
>  	int rc, nr_fails;
>  	unsigned long flags, deadline;
>  
> -	DPRINTK("ENTER\n");
> -
>  	/* prep for recovery */
>  	ata_for_each_link(link, ap, EDGE) {
>  		struct ata_eh_context *ehc = &link->eh_context;
> @@ -3964,7 +3957,6 @@ int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset,
>  	if (rc && r_failed_link)
>  		*r_failed_link = link;
>  
> -	DPRINTK("EXIT, rc=%d\n", rc);
>  	return rc;
>  }
>  
> diff --git a/drivers/ata/libata-pmp.c b/drivers/ata/libata-pmp.c
> index 3ff14071617c..438caf3a7d8c 100644
> --- a/drivers/ata/libata-pmp.c
> +++ b/drivers/ata/libata-pmp.c
> @@ -652,8 +652,6 @@ static int sata_pmp_revalidate(struct ata_device *dev, unsigned int new_class)
>  	u32 *gscr = (void *)ap->sector_buf;
>  	int rc;
>  
> -	DPRINTK("ENTER\n");
> -
>  	ata_eh_about_to_do(link, NULL, ATA_EH_REVALIDATE);
>  
>  	if (!ata_dev_enabled(dev)) {
> @@ -686,12 +684,10 @@ static int sata_pmp_revalidate(struct ata_device *dev, unsigned int new_class)
>  
>  	ata_eh_done(link, NULL, ATA_EH_REVALIDATE);
>  
> -	DPRINTK("EXIT, rc=0\n");
>  	return 0;
>  
>   fail:
>  	ata_dev_err(dev, "PMP revalidation failed (errno=%d)\n", rc);
> -	DPRINTK("EXIT, rc=%d\n", rc);
>  	return rc;
>  }
>  
> @@ -759,8 +755,6 @@ static int sata_pmp_eh_recover_pmp(struct ata_port *ap,
>  	int detach = 0, rc = 0;
>  	int reval_failed = 0;
>  
> -	DPRINTK("ENTER\n");
> -
>  	if (dev->flags & ATA_DFLAG_DETACH) {
>  		detach = 1;
>  		goto fail;
> @@ -827,7 +821,6 @@ static int sata_pmp_eh_recover_pmp(struct ata_port *ap,
>  	/* okay, PMP resurrected */
>  	ehc->i.flags = 0;
>  
> -	DPRINTK("EXIT, rc=0\n");
>  	return 0;
>  
>   fail:
> @@ -837,7 +830,6 @@ static int sata_pmp_eh_recover_pmp(struct ata_port *ap,
>  	else
>  		ata_dev_disable(dev);
>  
> -	DPRINTK("EXIT, rc=%d\n", rc);
>  	return rc;
>  }
>  
> diff --git a/include/trace/events/libata.h b/include/trace/events/libata.h
> index 40027d8424f8..c882c8f9b405 100644
> --- a/include/trace/events/libata.h
> +++ b/include/trace/events/libata.h
> @@ -454,6 +454,37 @@ TRACE_EVENT(ata_eh_link_autopsy_qc,
>  		  __parse_eh_err_mask(__entry->eh_err_mask))
>  );
>  
> +DECLARE_EVENT_CLASS(ata_eh_action_template,
> +
> +	TP_PROTO(struct ata_link *link, unsigned int devno, unsigned int eh_action),
> +
> +	TP_ARGS(link, devno, eh_action),
> +
> +	TP_STRUCT__entry(
> +		__field( unsigned int,	ata_port )
> +		__field( unsigned int,	ata_dev	)
> +		__field( unsigned int,	eh_action )
> +	),
> +
> +	TP_fast_assign(
> +		__entry->ata_port	= link->ap->print_id;
> +		__entry->ata_dev	= link->pmp + devno;
> +		__entry->eh_action	= eh_action;
> +	),
> +
> +	TP_printk("ata_port=%u ata_dev=%u eh_action=%s",
> +		  __entry->ata_port, __entry->ata_dev,
> +		  __parse_eh_action(__entry->eh_action))
> +);
> +
> +DEFINE_EVENT(ata_eh_action_template, ata_eh_about_to_do,
> +	     TP_PROTO(struct ata_link *link, unsigned int devno, unsigned int eh_action),
> +	     TP_ARGS(link, devno, eh_action));
> +
> +DEFINE_EVENT(ata_eh_action_template, ata_eh_done,
> +	     TP_PROTO(struct ata_link *link, unsigned int devno, unsigned int eh_action),
> +	     TP_ARGS(link, devno, eh_action));
> +
>  DECLARE_EVENT_CLASS(ata_link_reset_begin_template,
>  
>  	TP_PROTO(struct ata_link *link, unsigned int *class, unsigned long deadline),
> @@ -534,6 +565,35 @@ DEFINE_EVENT(ata_link_reset_end_template, ata_slave_postreset,
>  	     TP_PROTO(struct ata_link *link, unsigned int *class, int rc),
>  	     TP_ARGS(link, class, rc));
>  
> +DECLARE_EVENT_CLASS(ata_port_eh_begin_template,
> +
> +	TP_PROTO(struct ata_port *ap),
> +
> +	TP_ARGS(ap),
> +
> +	TP_STRUCT__entry(
> +		__field( unsigned int,	ata_port )
> +	),
> +
> +	TP_fast_assign(
> +		__entry->ata_port	= ap->print_id;
> +	),
> +
> +	TP_printk("ata_port=%u", __entry->ata_port)
> +);
> +
> +DEFINE_EVENT(ata_port_eh_begin_template, ata_std_sched_eh,
> +	     TP_PROTO(struct ata_port *ap),
> +	     TP_ARGS(ap));
> +
> +DEFINE_EVENT(ata_port_eh_begin_template, ata_port_freeze,
> +	     TP_PROTO(struct ata_port *ap),
> +	     TP_ARGS(ap));
> +
> +DEFINE_EVENT(ata_port_eh_begin_template, ata_port_thaw,
> +	     TP_PROTO(struct ata_port *ap),
> +	     TP_ARGS(ap));
> +
>  DECLARE_EVENT_CLASS(ata_sff_hsm_template,
>  
>  	TP_PROTO(struct ata_queued_cmd *qc, unsigned char status),
> 



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