linux-kernel - Re: [PATCH v5 3/7] arm64/sysreg/tools: Move TRFCR definitions to sysreg

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Date: Tue, 20 Feb 2024 16:11:30 +0000
From: Mark Brown <broonie@...nel.org>
To: James Clark <james.clark@....com>
Cc: coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org,
	kvmarm@...ts.linux.dev, maz@...nel.org, suzuki.poulose@....com,
	acme@...nel.org, oliver.upton@...ux.dev,
	James Morse <james.morse@....com>,
	Zenghui Yu <yuzenghui@...wei.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>, Mike Leach <mike.leach@...aro.org>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Anshuman Khandual <anshuman.khandual@....com>,
	Miguel Luis <miguel.luis@...cle.com>,
	Joey Gouly <joey.gouly@....com>, Ard Biesheuvel <ardb@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Arnd Bergmann <arnd@...db.de>, Mark Rutland <mark.rutland@....com>,
	Kalesh Singh <kaleshsingh@...gle.com>,
	Vincent Donnefort <vdonnefort@...gle.com>,
	Ryan Roberts <ryan.roberts@....com>, Fuad Tabba <tabba@...gle.com>,
	Jing Zhang <jingzhangos@...gle.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 3/7] arm64/sysreg/tools: Move TRFCR definitions to
 sysreg

On Tue, Feb 20, 2024 at 10:09:13AM +0000, James Clark wrote:
> Add separate definitions for ELx and EL2 as TRFCR_EL1 doesn't have CX.
> This also mirrors the previous definition so no code change is required.

This is also converting to automatic generation in the process.

> +SysregFields TRFCR_EL2
> +Res0	63:7
> +UnsignedEnum	6:5	TS
> +	0b0000	USE_TRFCR_EL1_TS
> +	0b0001	VIRTUAL
> +	0b0010	GUEST_PHYSICAL
> +	0b0011	PHYSICAL
> +EndEnum
> +Res0	4
> +Field	3	CX
> +Res0	2
> +Field	1	E2TRE
> +Field	0	E0HTRE
> +EndSysregFields

This has exactly one user and I'd not expect more so why have a separate
SysregFields?

> +# TRFCR_EL1 doesn't have the CX bit so redefine it without CX instead of
> +# using a shared definition between TRFCR_EL2 and TRFCR_EL1

This comment is reflecting the default state?

> +Sysreg	TRFCR_EL1	3	0	1	2	1
> +Fields	TRFCR_ELx
> +EndSysreg
> +
> +Sysreg	TRFCR_EL2	3	4	1	2	1
> +Fields	TRFCR_EL2
> +EndSysreg
> +
> +Sysreg	TRFCR_EL12	3	5	1	2	1
> +Fields	TRFCR_ELx
> +EndSysreg

These are generally sorted by encoding (simiarly to how sysreg.h was
sorted historically).

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