linux-kernel - Re: [PATCH v2 3/4] scsi: ufs: add trace events and dump prints for debug

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Message-ID: <20150212145551.2d234fb1@gandalf.local.home>
Date:	Thu, 12 Feb 2015 14:55:51 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Gilad Broner <gbroner@...eaurora.org>
Cc:	James.Bottomley@...senPartnership.com,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, santoshsy@...il.com,
	linux-scsi-owner@...r.kernel.org, subhashj@...eaurora.org,
	ygardi@...eaurora.org, draviv@...eaurora.org,
	Lee Susman <lsusman@...eaurora.org>,
	Sujit Reddy Thumma <sthumma@...eaurora.org>,
	Vinayak Holikatti <vinholikatti@...il.com>,
	"James E.J. Bottomley" <JBottomley@...allels.com>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH v2 3/4] scsi: ufs: add trace events and dump prints for
 debug

On Tue, 10 Feb 2015 15:58:54 +0200
Gilad Broner <gbroner@...eaurora.org> wrote:

I really hate large patches like this. So much to dig through.

> -#ifdef CONFIG_DEBUG_FS
> +#define UIC_ERR_REG_HIST_LENGTH 8
> +/**
> + * struct ufs_uic_err_reg_hist - keeps history of uic errors
> + * @pos: index to indicate cyclic buffer position
> + * @reg: cyclic buffer for registers value
> + * @tstamp: cyclic buffer for time stamp
> + */
> +struct ufs_uic_err_reg_hist {
> +	int pos;
> +	u32 reg[UIC_ERR_REG_HIST_LENGTH];
> +	ktime_t tstamp[UIC_ERR_REG_HIST_LENGTH];
> +};
> +
> +/**
> + * struct ufs_stats - keeps usage/err statistics
> + * @enabled: enable tagstats for debugfs
> + * @tag_stats: pointer to tag statistic counters
> + * @q_depth: current amount of busy slots
> + * @err_stats: counters to keep track of various errors
> + * @hibern8_exit_cnt: Counter to keep track of number of exits,
> + *		reset this after link-startup.
> + * @last_hibern8_exit_tstamp: Set time after the hibern8 exit.
> + *		Clear after the first successful command completion.
> + * @pa_err: tracks pa-uic errors
> + * @dl_err: tracks dl-uic errors
> + * @nl_err: tracks nl-uic errors
> + * @tl_err: tracks tl-uic errors
> + * @dme_err: tracks dme errors
> + */
>  struct ufs_stats {
> +#ifdef CONFIG_DEBUG_FS
>  	bool enabled;
>  	u64 **tag_stats;
>  	int q_depth;
>  	int err_stats[UFS_ERR_MAX];
> +#endif

Can any of the tracepoint code be called that references these when
CONFIG_DEBUG_FS is not set? Because soon (possibly even this merge
window), tracing will no longer depend on DEBUG_FS, because it will
have its own filesystem.

-- Steve

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