linux-kernel - Re: [PATCH V2 04/46] arm64/sysreg: Update register fields for TRBIDR

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Message-ID: <8ad1e830-9ac9-4776-a877-c8d37bb03a3c@arm.com>
Date: Thu, 19 Dec 2024 08:18:41 +0530
From: Anshuman Khandual <anshuman.khandual@....com>
To: Eric Auger <eauger@...hat.com>, linux-kernel@...r.kernel.org,
 kvmarm@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org, maz@...nel.org
Cc: ryan.roberts@....com, Oliver Upton <oliver.upton@...ux.dev>,
 James Morse <james.morse@....com>, Suzuki K Poulose
 <suzuki.poulose@....com>, Catalin Marinas <catalin.marinas@....com>,
 Will Deacon <will@...nel.org>, Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH V2 04/46] arm64/sysreg: Update register fields for
 TRBIDR_EL1



On 12/18/24 20:10, Eric Auger wrote:
> Hi Anshuman
> 
> On 12/10/24 06:52, Anshuman Khandual wrote:
>> This adds register fields for TRBIDR_EL1 as per the definitions based
>> on DDI0601 2024-09.
>>
>> Cc: Catalin Marinas <catalin.marinas@....com>
>> Cc: Will Deacon <will@...nel.org>
>> Cc: Mark Brown <broonie@...nel.org>
>> Cc: linux-arm-kernel@...ts.infradead.org
>> Cc: linux-kernel@...r.kernel.org
>> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
>> ---
>>  arch/arm64/tools/sysreg | 15 +++++++++++++--
>>  1 file changed, 13 insertions(+), 2 deletions(-)
>>
>> diff --git a/arch/arm64/tools/sysreg b/arch/arm64/tools/sysreg
>> index 59351931d907..10b1a0998d99 100644
>> --- a/arch/arm64/tools/sysreg
>> +++ b/arch/arm64/tools/sysreg
>> @@ -3295,13 +3295,24 @@ Field	31:0	TRG
>>  EndSysreg
>>  
>>  Sysreg	TRBIDR_EL1	3	0	9	11	7
>> -Res0	63:12
>> +Res0	63:48
>> +Field	47:32	MaxBuffSize
>> +Res0	31:16
>> +UnsignedEnum	15:12	MPAM
>> +	0b0000	NI
>> +	0b0001	PMG
> Out of curiosity how did you choose the PMG terminology?
> I see "MPAM implemented by the Trace Buffer Unit, using default PARTID
> and PMG values in External mode". Wouldn't be TBU more meaningful?

Right, TBU seems better. Unless Mark thinks otherwise, will change.