linux-kernel - Re: [PATCH V4 1/7] arm64/perf: Add BRBE registers and fields

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Message-ID: <561e9e28-8459-b422-4989-176db9a2bd4b@arm.com>
Date:   Wed, 19 Oct 2022 08:31:13 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     Mark Brown <broonie@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, peterz@...radead.org,
        acme@...nel.org, mark.rutland@....com, will@...nel.org,
        catalin.marinas@....com, James Clark <james.clark@....com>,
        Rob Herring <robh@...nel.org>, Marc Zyngier <maz@...nel.org>,
        Suzuki Poulose <suzuki.poulose@....com>,
        Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH V4 1/7] arm64/perf: Add BRBE registers and fields



On 10/18/22 19:26, Mark Brown wrote:
> On Mon, Oct 17, 2022 at 11:27:07AM +0530, Anshuman Khandual wrote:
> 
> I spotted one typo below but otherwise this looks good!
> 
>> +# This is just a dummy register declaration to get all common field masks and
>> +# shifts for accessing given BRBINF contents.
>> +Sysreg	BRBINF_EL1	2	1	8	0	0
> 
> This seems reasonable to me, others may disagree.
> 
>> +Sysreg	BRBCR_EL1	2	1	9	0	0
>> +Res0	63:24
>> +Field	23 	EXCEPTION
>> +Field	22 	ERTN
>> +Res0	21:9
>> +Field	8 	FZP
>> +Res0	7
>> +Enum	6:5	TS
>> +	0b1	VIRTUAL
> 
> I'd have expected this to be written as 0b01.  Doesn't make any
> practical difference though.

Sure, will change.

> 
>> +Sysreg	BRBFCR_EL1	2	1	9	0	1
> 
>> +Field	16	EnL
> 
> This is "EnI" in DDI0487I.a.

Okay, will replace "EnL" with "EnI" instead.