linux-kernel - [PATCH] Make Fujitsu Erratum 010001 patch can be applied on A64FX v1r0

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Date:   Fri, 15 Mar 2019 09:54:37 +0000
From:   "Okamoto, Takayuki" <tokamoto@...fujitsu.com>
To:     'Will Deacon' <will.deacon@....com>,
        'Mark Rutland' <mark.rutland@....com>,
        'Catalin Marinas' <catalin.marinas@....com>,
        "'James Morse'" <james.morse@....com>,
        "'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
        "'linux-arm-kernel@...ts.infradead.org'" 
        <linux-arm-kernel@...ts.infradead.org>
CC:     "Zhang, Lei" <zhang.lei@...fujitsu.com>
Subject: [PATCH] Make Fujitsu Erratum 010001 patch can be applied on A64FX
 v1r0

Hi guys,

> -----Original Message-----
> From: James Morse <james.morse@....com>
> Sent: Wednesday, February 27, 2019 3:44 AM
> To: james.morse@....com; linux-arm-kernel@...ts.infradead.org
> Cc: linux-kernel@...r.kernel.org; Catalin Marinas
> <catalin.marinas@....com>; Mark Rutland <mark.rutland@....com>; Will
> Deacon <will.deacon@....com>; Zhang, Lei <zhang.lei@...fujitsu.com>
> Subject: [PATCH v5] arm64: Add workaround for Fujitsu A64FX erratum
> 010001
> 
> +/* Fujitsu Erratum 010001 affects A64FX 1.0 and 1.1, (v0r0 and v1r0) */
> +#define MIDR_FUJITSU_ERRATUM_010001
> 	MIDR_FUJITSU_A64FX
> +#define MIDR_FUJITSU_ERRATUM_010001_MASK
> 	(~MIDR_VARIANT(1))

This workaround for the erratum should be applied for both A64FX v1r0 and
v0r0, however, the patch v5 is only enabled on A64FX v0r0(MIDR.Variant == 0
&& MIDR.Revision == 0).
This issue is caused by the macro MIDR_FUJITSU_ERRATUM_010001_MASK.

I have tested on both A64FX v1r0 and v0r0. This new patch will effect
only for A64FX.

--
Changed to be applied for not only A64FX v0r0 but also v1r0.

Signed-off-by: Zhang Lei <zhang.lei@...fujitsu.com>
---
 arch/arm64/include/asm/cputype.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/cputype.h b/arch/arm64/include/asm/cputype.h
index 2afb133..1fb47b5 100644
--- a/arch/arm64/include/asm/cputype.h
+++ b/arch/arm64/include/asm/cputype.h
@@ -129,7 +129,7 @@

 /* Fujitsu Erratum 010001 affects A64FX 1.0 and 1.1, (v0r0 and v1r0) */
 #define MIDR_FUJITSU_ERRATUM_010001            MIDR_FUJITSU_A64FX
-#define MIDR_FUJITSU_ERRATUM_010001_MASK       (~MIDR_VARIANT(1))
+#define MIDR_FUJITSU_ERRATUM_010001_MASK       (~(0x1 << MIDR_VARIANT_SHIFT))
 #define TCR_CLEAR_FUJITSU_ERRATUM_010001       (TCR_NFD1 | TCR_NFD0)

 #ifndef __ASSEMBLY__
--
1.8.3.1


Best Regards,
Takayuki Okamoto