linux-kernel - Re: [PATCH v2 0/6] arm64: tlb: add support for TTL feature

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Date:   Mon, 11 May 2020 20:41:24 +0800
From:   Zhenyu Ye <yezhenyu2@...wei.com>
To:     <peterz@...radead.org>, <mark.rutland@....com>, <will@...nel.org>,
        <catalin.marinas@....com>, <aneesh.kumar@...ux.ibm.com>,
        <akpm@...ux-foundation.org>, <npiggin@...il.com>, <arnd@...db.de>,
        <rostedt@...dmis.org>, <maz@...nel.org>, <suzuki.poulose@....com>,
        <tglx@...utronix.de>, <yuzhao@...gle.com>, <Dave.Martin@....com>,
        <steven.price@....com>, <broonie@...nel.org>,
        <guohanjun@...wei.com>
CC:     <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>
Subject: Re: [PATCH v2 0/6] arm64: tlb: add support for TTL feature

Hi all,

How is this going about this patch series? Does anyone have any
suggestions?

Thanks,
Zhenyu

On 2020/4/23 21:56, Zhenyu Ye wrote:
> In order to reduce the cost of TLB invalidation, ARMv8.4 provides
> the TTL field in TLBI instruction.  The TTL field indicates the
> level of page table walk holding the leaf entry for the address
> being invalidated.  This series provide support for this feature.
> 
> When ARMv8.4-TTL is implemented, the operand for TLBIs looks like
> below:
> 
> * +----------+-------+----------------------+
> * |   ASID   |  TTL  |        BADDR         |
> * +----------+-------+----------------------+
> * |63      48|47   44|43                   0|
> 
> 
> This version updates some codes implementation according to Peter's
> suggestion, and adds some commit msg.
> 
> See patches for details, Thanks.
> 
> 
> --
> ChangeList:
> v2:
> rebase series on Linux 5.7-rc1 and simplify the code implementation.
> 
> v1:
> add support for TTL feature in arm64.
> 
> Marc Zyngier (2):
>   arm64: Detect the ARMv8.4 TTL feature
>   arm64: Add level-hinted TLB invalidation helper
> 
> Peter Zijlstra (Intel) (1):
>   tlb: mmu_gather: add tlb_flush_*_range APIs
> 
> Zhenyu Ye (3):
>   arm64: Add tlbi_user_level TLB invalidation helper
>   mm: tlb: Provide flush_*_tlb_range wrappers
>   arm64: tlb: Set the TTL field in flush_tlb_range
> 
>  arch/arm64/include/asm/cpucaps.h  |  3 +-
>  arch/arm64/include/asm/sysreg.h   |  1 +
>  arch/arm64/include/asm/tlb.h      | 29 +++++++++++++++-
>  arch/arm64/include/asm/tlbflush.h | 54 +++++++++++++++++++++++++-----
>  arch/arm64/kernel/cpufeature.c    | 11 +++++++
>  include/asm-generic/pgtable.h     | 12 +++++--
>  include/asm-generic/tlb.h         | 55 ++++++++++++++++++++++---------
>  mm/pgtable-generic.c              | 22 +++++++++++++
>  8 files changed, 160 insertions(+), 27 deletions(-)
>