linux-kernel - Re: [PATCH] trace/events: add chip name and hwirq to irq entry tracepoint

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Date:	Fri, 29 May 2015 16:15:52 -0600
From:	"Ankit Gupta" <ankgupta@...eaurora.org>
To:	"Ankit Gupta" <ankgupta@...eaurora.org>, davem@...emloft.net,
	mingo@...hat.com, rostedt@...dmis.org, rdunlap@...radead.org,
	standby24x7@...il.com, linux-kernel@...r.kernel.org
Cc:	jason@...ian.org, robh@...nel.org, grant.likely@...aro.org,
	sboyd@...eaurora.org, gavidov@...eaurora.org,
	sdharia@...eaurora.org, linus.walleij@...aro.org,
	mlocke@...eaurora.org, galak@...eaurora.org, agross@...eaurora.org,
	"Ankit Gupta" <ankgupta@...eaurora.org>
Subject: Re: [PATCH] trace/events: add chip name and hwirq to irq entry
 tracepoint

> Add chip name and hw-irq number to the trace_irq_handler_entry()
> tracepoint. When tracing interrupt events the chip-name and hw-irq
> numbers are stable and known in advance. This makes them a better
> choice as a filtering criteria for the trace buffer dump. On the
> flipside, the os-irq numbers are dynamically allocated which makes
> them difficult to use for the same purpose.
>
> Dump message will look like:
> ...irq_handler_entry: irq=22 name=msm_serial0 domain=GIC hwirq=140
>
> Suggested-by: Stephen Boyd <sboyd@...eaurora.org>
> Signed-off-by: Gilad Avidov <gavidov@...eaurora.org>
> Signed-off-by: Ankit Gupta <ankgupta@...eaurora.org>
> ---
>  include/trace/events/irq.h | 15 ++++++++++++++-
>  1 file changed, 14 insertions(+), 1 deletion(-)
>
> diff --git a/include/trace/events/irq.h b/include/trace/events/irq.h
> index 3608beb..5370075 100644
> --- a/include/trace/events/irq.h
> +++ b/include/trace/events/irq.h
> @@ -23,6 +23,17 @@ struct softirq_action;
>  			 softirq_name(HRTIMER),		\
>  			 softirq_name(RCU))
>
> +
> +#define show_chip_name(irq)					\
> +	(irq_get_irq_data(irq)					\
> +			 ? irq_get_irq_data(irq)->chip->name	\
> +			 : "NULL")
> +
> +#define show_hwirq(irq)						\
> +	(irq_get_irq_data(irq)					\
> +			 ? irq_get_irq_data(irq)->hwirq		\
> +			 : -ENODEV)
> +
>  /**
>   * irq_handler_entry - called immediately before the irq action handler
>   * @irq: irq number
> @@ -50,7 +61,9 @@ TRACE_EVENT(irq_handler_entry,
>  		__assign_str(name, action->name);
>  	),
>
> -	TP_printk("irq=%d name=%s", __entry->irq, __get_str(name))
> +	TP_printk("irq=%d name=%s chip_name=%s hwirq=%ld", __entry->irq,
> +	  __get_str(name), show_chip_name(__entry->irq),
> +	  show_hwirq(__entry->irq))
>  );
>
>  /**
> --
> 1.8.5.2
>
>



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