linux-kernel - Re: [PATCH V2 14/14] arm64/sysreg: Convert TRBIDR

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Date:   Tue, 13 Jun 2023 09:56:31 +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>, Marc Zyngier <maz@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        James Morse <james.morse@....com>, kvmarm@...ts.linux.dev,
        coresight@...ts.linaro.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 14/14] arm64/sysreg: Convert TRBIDR_EL1 register to
 automatic generation



On 6/2/23 17:42, Mark Brown wrote:
> On Fri, Jun 02, 2023 at 11:55:52AM +0530, Anshuman Khandual wrote:
>> This converts TRBIDR_EL1 register to automatic generation without
>> causing any functional change.
> 
>> +Sysreg	TRBIDR_EL1	3	0	9	11	7
>> +Res0	63:12
>> +Field	11:8	EA
> 
> EA is another field which looks like it should be an enum, as with the
> others this shouldn't be a blocker and could be done incrementally.

Will fold the following changes in this patch.

--- a/arch/arm64/tools/sysreg
+++ b/arch/arm64/tools/sysreg
@@ -2267,7 +2267,11 @@ EndSysreg
 
 Sysreg TRBIDR_EL1      3       0       9       11      7
 Res0   63:12
-Field  11:8    EA
+Enum   11:8    EA
+       0b0000  NON_DESC
+       0b0001  IGNORE
+       0b0010  SERROR
+EndEnum
 Res0   7:6
 Field  5       F
 Field  4       P


> 
>> +Res0	7:6
>> +Field	5	F
>> +Field	4	P
>> +Field	3:0	Align
> 
> Align arguably too though really it's just encoding the relevant power
> of 2 with the enum coming from the fact that it's limited to at most 2KB
> alignment so a Field may well make more sense.

Can fold the following changes in this patch (if required) unless the Field
looks better than Enum.

--- a/arch/arm64/tools/sysreg
+++ b/arch/arm64/tools/sysreg
@@ -2275,5 +2275,18 @@ EndEnum
 Res0   7:6
 Field  5       F
 Field  4       P
-Field  3:0     Align
+Enum   3:0     Align
+       0b0000  BYTE
+       0b0001  HALF_WORD
+       0b0010  WORD
+       0b0011  DOUBLE_WORD
+       0b0100  16_BYTES
+       0b0101  32_BYTES
+       0b0110  64_BYTES
+       0b0111  128_BYTES
+       0b1000  156_BYTES
+       0b1001  512_BYTES
+       0b1010  1_KB
+       0b1011  2_KB
+EndEnum
 EndSysreg

> 
> Reviewed-by: Mark Brown <broonie@...nel.org>