linux-kernel - Re: [PATCH v2 0/3] arm-smmu: performance optimization

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Date:   Tue, 19 Sep 2017 00:31:03 -0400
From:   Nate Watterson <nwatters@...eaurora.org>
To:     Zhen Lei <thunder.leizhen@...wei.com>,
        Will Deacon <will.deacon@....com>,
        Joerg Roedel <joro@...tes.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        iommu <iommu@...ts.linux-foundation.org>,
        Robin Murphy <robin.murphy@....com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Cc:     Jinyue Li <lijinyue@...wei.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Libin <huawei.libin@...wei.com>,
        Hanjun Guo <guohanjun@...wei.com>
Subject: Re: [PATCH v2 0/3] arm-smmu: performance optimization

Hi Leizhen,

On 9/12/2017 9:00 AM, Zhen Lei wrote:
> v1 -> v2:
> base on (add02cfdc9bc2 "iommu: Introduce Interface for IOMMU TLB Flushing")
> 
> Zhen Lei (3):
>    iommu/arm-smmu-v3: put off the execution of TLBI* to reduce lock
>      confliction
>    iommu/arm-smmu-v3: add support for unmap an iova range with only one
>      tlb sync

I tested these (2) patches on QDF2400 hardware and saw performance
improvements in line with those I reported when testing the original
series. I don't have any hardware close at hand to test the 3rd patch
in the series so that will have to come from someone else.

Tested-by: Nate Watterson <nwatters@...eaurora.org>

Thanks,
Nate

>    iommu/arm-smmu: add support for unmap a memory range with only one tlb
>      sync
> 
>   drivers/iommu/arm-smmu-v3.c        | 52 ++++++++++++++++++++++++++++++++++----
>   drivers/iommu/arm-smmu.c           | 10 ++++++++
>   drivers/iommu/io-pgtable-arm-v7s.c | 32 +++++++++++++++--------
>   drivers/iommu/io-pgtable-arm.c     | 30 ++++++++++++++--------
>   drivers/iommu/io-pgtable.h         |  1 +
>   5 files changed, 99 insertions(+), 26 deletions(-)
> 

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