linux-kernel - Re: [PATCH v2 2/2] arm64: tlb: Use the TLBI RANGE feature in arm64

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Message-ID: <20200713172158.GE15829@gaia>
Date:   Mon, 13 Jul 2020 18:21:59 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Jon Hunter <jonathanh@...dia.com>
Cc:     Zhenyu Ye <yezhenyu2@...wei.com>, will@...nel.org,
        suzuki.poulose@....com, maz@...nel.org, steven.price@....com,
        guohanjun@...wei.com, olof@...om.net,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-mm@...ck.org, arm@...nel.org,
        xiexiangyou@...wei.com, prime.zeng@...ilicon.com,
        zhangshaokun@...ilicon.com, kuhn.chenqun@...wei.com,
        linux-tegra <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] arm64: tlb: Use the TLBI RANGE feature in arm64

On Mon, Jul 13, 2020 at 03:44:16PM +0100, Jon Hunter wrote:
> On 13/07/2020 15:39, Zhenyu Ye wrote:
> > On 2020/7/13 22:27, Jon Hunter wrote:
> >> After this change I am seeing the following build errors ...
> >>
> >> /tmp/cckzq3FT.s: Assembler messages:
> >> /tmp/cckzq3FT.s:854: Error: unknown or missing operation name at operand 1 -- `tlbi rvae1is,x7'
> >> /tmp/cckzq3FT.s:870: Error: unknown or missing operation name at operand 1 -- `tlbi rvae1is,x7'
> >> /tmp/cckzq3FT.s:1095: Error: unknown or missing operation name at operand 1 -- `tlbi rvae1is,x7'
> >> /tmp/cckzq3FT.s:1111: Error: unknown or missing operation name at operand 1 -- `tlbi rvae1is,x7'
> >> /tmp/cckzq3FT.s:1964: Error: unknown or missing operation name at operand 1 -- `tlbi rvae1is,x7'
> >> /tmp/cckzq3FT.s:1980: Error: unknown or missing operation name at operand 1 -- `tlbi rvae1is,x7'
> >> /tmp/cckzq3FT.s:2286: Error: unknown or missing operation name at operand 1 -- `tlbi rvae1is,x7'
> >> /tmp/cckzq3FT.s:2302: Error: unknown or missing operation name at operand 1 -- `tlbi rvae1is,x7'
> >> /tmp/cckzq3FT.s:4833: Error: unknown or missing operation name at operand 1 -- `tlbi rvae1is,x6'
> >> /tmp/cckzq3FT.s:4849: Error: unknown or missing operation name at operand 1 -- `tlbi rvae1is,x6'
> >> /tmp/cckzq3FT.s:5090: Error: unknown or missing operation name at operand 1 -- `tlbi rvae1is,x6'
> >> /tmp/cckzq3FT.s:5106: Error: unknown or missing operation name at operand 1 -- `tlbi rvae1is,x6'
> >> /tmp/cckzq3FT.s:874: Error: attempt to move .org backwards
> >> /tmp/cckzq3FT.s:1115: Error: attempt to move .org backwards
> >> /tmp/cckzq3FT.s:1984: Error: attempt to move .org backwards
> >> /tmp/cckzq3FT.s:2306: Error: attempt to move .org backwards
> >> /tmp/cckzq3FT.s:4853: Error: attempt to move .org backwards
> >> /tmp/cckzq3FT.s:5110: Error: attempt to move .org backwards
> >> scripts/Makefile.build:280: recipe for target 'arch/arm64/mm/hugetlbpage.o' failed
> >> make[3]: *** [arch/arm64/mm/hugetlbpage.o] Error 1
> >> scripts/Makefile.build:497: recipe for target 'arch/arm64/mm' failed
> >> make[2]: *** [arch/arm64/mm] Error 2
> > 
> > The code must be built with binutils >= 2.30.
> > Maybe I should add  a check on whether binutils supports ARMv8.4-a instructions...
> 
> Yes I believe so.

The binutils guys in Arm confirmed that assembling "tlbi rvae1is"
without -march=armv8.4-a is a bug. When it gets fixed, checking for the
binutils version is not sufficient without passing -march. I think we
are better off with a manual encoding of the instruction.

-- 
Catalin