linux-kernel - Re: [PATCH] arm64/sysreg: Update ID_AA64DFR0_EL1 and ID_DFR0

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Date: Sun, 18 Feb 2024 06:24:59 +0530
From: Anshuman Khandual <anshuman.khandual@....com>
To: Mark Brown <broonie@...nel.org>
Cc: linux-arm-kernel@...ts.infradead.org,
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64/sysreg: Update ID_AA64DFR0_EL1 and ID_DFR0_EL1



On 2/15/24 18:30, Mark Brown wrote:
> On Thu, Feb 15, 2024 at 11:21:59AM +0530, Anshuman Khandual wrote:
> 
>> This just updates ID_DFR0_EL1.CopDbg and ID_AA64DFR0_EL1.DebugVer register
>> fields as per the definitions based on DDI0601 2023-12.
> 
> Just as a general note for non-trival registers it's easier to review if
> we change one register per patch, it avoids having to re-review the same
> registers repeatedly and for incremental changes like this it helps with
> the fact that diff does badly at offering context.

Agreed, and noted.

> 
>> --- a/arch/arm64/tools/sysreg
>> +++ b/arch/arm64/tools/sysreg
>> @@ -231,6 +231,7 @@ Enum	3:0	CopDbg
>>  	0b1000	Debugv8p2
>>  	0b1001	Debugv8p4
>>  	0b1010	Debugv8p8
>> +	0b1011	Debugv8p9
>>  EndEnum
>>  EndSysreg
> 
> This is ID_AA64DFR0_EL1 and is missing at least an update to PMSVer.
> 
>>  
>> @@ -1247,6 +1248,7 @@ UnsignedEnum	3:0	DebugVer
>>  	0b1000	V8P2
>>  	0b1001	V8P4
>>  	0b1010	V8P8
>> +	0b1011	V8P9
>>  EndEnum
>>  EndSysreg
> 
> This is ID_DFR0_EL1 and is missing an update to at least PerfMon.

Will fold in the following changes i.e for ID_DFR0_EL1 and for
ID_AA64DFR0_EL1 respectively and then split the patch into two
- one for each register.

diff --git a/arch/arm64/tools/sysreg b/arch/arm64/tools/sysreg
index cc2914d6ebdc..508224a0e078 100644
--- a/arch/arm64/tools/sysreg
+++ b/arch/arm64/tools/sysreg
@@ -200,6 +200,7 @@ UnsignedEnum        27:24   PerfMon
        0b0110  PMUv3p5
        0b0111  PMUv3p7
        0b1000  PMUv3p8
+       0b1001  PMUv3p9
        0b1111  IMPDEF
 EndEnum
 Enum   23:20   MProfDbg
@@ -1222,6 +1223,7 @@ UnsignedEnum      35:32   PMSVer
        0b0010  V1P1
        0b0011  V1P2
        0b0100  V1P3
+       0b0101  V1P4
 EndEnum
 Field  31:28   CTX_CMPs
 Res0   27:24