linux-kernel - Re: [PATCH 4/5] coresight: Add better messages for coresight

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Date:	Wed, 1 Jun 2016 09:15:17 -0600
From:	Mathieu Poirier <mathieu.poirier@...aro.org>
To:	Suzuki K Poulose <Suzuki.Poulose@....com>
Cc:	Joe Perches <joe@...ches.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/5] coresight: Add better messages for coresight_timeout

On 1 June 2016 at 03:34, Suzuki K Poulose <Suzuki.Poulose@....com> wrote:
> On 31/05/16 18:58, Joe Perches wrote:
>>
>> On Tue, 2016-05-31 at 12:57 +0100, Suzuki K Poulose wrote:
>>>
>>> When we encounter a timeout waiting for a status change via
>>> coresight_timeout, the caller always print the offset which
>>> was tried. This is pretty much useless as it doesn't specify
>>> the bit position we wait for. Also, one needs to lookup the
>>> TRM to figure out, what was wrong. This patch changes all
>>> such error messages to print something more meaningful.
>>
>>
>> trivia:
>>
>> Perhaps consistently using
>>         dev_err(dev, "timeout while waiting for %s\n", "<foo>");
>> could make the object code a bit smaller.
>>
>>> diff --git a/drivers/hwtracing/coresight/coresight-etb10.c
>>> b/drivers/hwtracing/coresight/coresight-etb10.c
>>
>> []
>>>
>>> @@ -184,8 +184,7 @@ static void etb_disable_hw(struct etb_drvdata
>>> *drvdata)
>>>
>>>         if (coresight_timeout(drvdata->base, ETB_FFCR, ETB_FFCR_BIT, 0))
>>> {
>>>                 dev_err(drvdata->dev,
>>> -                       "timeout observed when probing at offset %#x\n",
>>> -                       ETB_FFCR);
>>> +                       "timeout while waiting for completion of Manual
>>> Flush\n");
>>
>>
>> ie:
>>                 dev_err(drvdata->dev,
>>                         "timeout while waiting for %s\n",
>>                         "completion of Manual Flush");
>>
>> but that depends on how many of these coresight
>> files are compiled and linked.
>
>
> Or we could move the timeout message to coresight_timeout(). The only
> disadvantage is
> if a caller is OK with silent timeouts. How about :
>
> int coresight_timeout(void *base, u32 offset, u32 bit, u32 val, char *info)
>
> where the message can be suppressed if info == NULL ?
>
> Mathieu, your thoughts ?

I'd rather keep things separate.

Thanks,
Mathieu

>
>>
>> There is a while/when usage difference in some of
>> the output messages.
>
>
> Right, I will fix them. This was a merged version of individual patches,
> hence
> the changes.
>
> Cheers
> Suzuki