linux-kernel - Re: [PATCH] spmi-pmic-arb: add irq tracepoints to the pmic-arb driver

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Date:	Tue, 26 May 2015 16:44:45 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Ankit Gupta <ankgupta@...eaurora.org>
CC:	gavidov@...eaurora.org, sdharia@...eaurora.org,
	ivan.ivanov@...aro.org, svarbanov@...sol.com, rostedt@...dmis.org,
	linux-arm-msm@...r.kernel.org, gregkh@...uxfoundation.org,
	collinsd@...eaurora.org, osvaldob@...eaurora.org,
	linux-kernel@...r.kernel.org, mlocke@...eaurora.org,
	galak@...eaurora.org, agross@...eaurora.org
Subject: Re: [PATCH] spmi-pmic-arb: add irq tracepoints to the pmic-arb driver

On 05/26/2015 04:39 PM, Ankit Gupta wrote:
> The spmi-pmic-arb is also an interrupt controller. It gets a
> single aggregate irq and disseminates it to individual
> pmic-peripheral drivers. Each pmic-peripheral has a unique apid
> number, and can have multiple interrupt capable functions.
> The registered apid range shows the lowest and highest apid
> numbers of pmic-peripheral drivers which request irqs. Pid is
> the base address of that peripheral. For performance measurement,
> tracepoints are added at the beginning of the aggregate irq and
> at the end of the individual pmic-peripheral irqs.
>
> Following is a list showing the new tracepoint events:
>
> spmi_pmic_arb_aggregate_irq_start: aggregate irq number and registered
> 				   apid range.
>
> spmi_pmic_arb_apid_irq_end: apid, irq, func_num, sid and pid.
>
> SPMI Interrupts tracepoints can be enabled like:
>
> echo 1 >/sys/kernel/debug/tracing/events/spmi-pmic-arb/enable
>
> and will dump messages that can be viewed in
> /sys/kernel/debug/tracing/trace that look like:
> ... spmi_pmic_arb_aggregate_irq_start: irq=150 registered apid range=(3,189)
> ... spmi_pmic_arb_apid_irq_end: apid=3 irq=1 func_num=0 sid=0 pid=0x8
>
> Suggested-by: Sagar Dharia <sdharia@...eaurora.org>
> Signed-off-by: Gilad Avidov <gavidov@...eaurora.org>
> Signed-off-by: Ankit Gupta <ankgupta@...eaurora.org>
> ---

How is this any better than irq tracepoints that we already have for 
generic irqs?

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

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