linux-kernel - Re: [PATCH 1/4] iommu/arm-smmu-v3: Use command queue batching helpers to improve performance

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Date:   Fri, 13 Aug 2021 17:45:23 +0100
From:   John Garry <john.garry@...wei.com>
To:     Robin Murphy <robin.murphy@....com>,
        Zhen Lei <thunder.leizhen@...wei.com>,
        Will Deacon <will@...nel.org>, Joerg Roedel <joro@...tes.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        iommu <iommu@...ts.linux-foundation.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/4] iommu/arm-smmu-v3: Use command queue batching helpers
 to improve performance

On 13/08/2021 17:01, Robin Murphy wrote:
>>
>> diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c 
>> b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
>> index 235f9bdaeaf223b..c81cd929047f573 100644
>> --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
>> +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
>> @@ -1747,15 +1747,16 @@ static int arm_smmu_atc_inv_master(struct 
>> arm_smmu_master *master)
>>   {
>>       int i;
>>       struct arm_smmu_cmdq_ent cmd;
>> +    struct arm_smmu_cmdq_batch cmds = {};
> 
> BTW, it looks like this has crossed over with John's patch removing these.

It is only called from arm_smmu_disable_ats(), so not hot-path by the 
look for it. Or who even has ats HW ...?

But it should be at least cleaned-up for consistency. Leizhen?

Thanks,
John