linux-kernel - Re: [PATCH 1/1] AArch64: TCR_TG1_64K incorrectly sets TCR

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Message-ID: <20140402123844.GE31892@arm.com>
Date:	Wed, 2 Apr 2014 13:38:44 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Joe Sylve <joe.sylve@...il.com>
Cc:	Will Deacon <Will.Deacon@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] AArch64: TCR_TG1_64K incorrectly sets TCR_EL1 bits
 [31:30]

On Wed, Apr 02, 2014 at 05:00:38AM +0100, Joe Sylve wrote:
> Section D7.2.83 TCR_EL1, Translation Control Register (EL1) of the
> latest ARM Architecture Reference Manual, ARMv8, for ARMv8-A states
> that TCR_EL1 TG1 (bits [31:30]) should be set to 11 for a 64KB
> TTBR1_EL1 granule size. The mainline 3.14 kernel incorrectly sets
> those bits to 01 (which is a 16KB granule size).
> 
> Signed-off-by: Joe Sylve <joe.sylve@...il.com>
> ---
> 
> --- a/arch/arm64/include/asm/pgtable-hwdef.h 2014-04-01 22:13:22.619868978 -0500
> +++ b/arch/arm64/include/asm/pgtable-hwdef.h 2014-04-01 22:13:58.071869886 -0500
> @@ -121,7 +121,7 @@
>  #define TCR_ORGN_MASK ((UL(3) << 10) | (UL(3) << 26))
>  #define TCR_SHARED ((UL(3) << 12) | (UL(3) << 28))
>  #define TCR_TG0_64K (UL(1) << 14)
> -#define TCR_TG1_64K (UL(1) << 30)
> +#define TCR_TG1_64K (UL(3) << 30)
>  #define TCR_IPS_40BIT (UL(2) << 32)
>  #define TCR_ASID16 (UL(1) << 36)
>  #define TCR_TBI0 (UL(1) << 37)

According to the spec, 4K pages is also wrong. The strange thing is that
it works fine on the model. I'll ask internally for clarification
whether it's a typo in the manual or Linux needs fixing.

Thanks.

-- 
Catalin
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