linux-kernel - Re: [PATCH RFC v1 08/15] iommu: Add asid_bits to arm smmu-v3 stage1 table info

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Date:   Fri, 12 Mar 2021 18:27:18 +0530
From:   Vivek Kumar Gautam <vivek.gautam@....com>
To:     Jean-Philippe Brucker <jean-philippe@...aro.org>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org,
        virtualization@...ts.linux-foundation.org, joro@...tes.org,
        will.deacon@....com, mst@...hat.com, robin.murphy@....com,
        eric.auger@...hat.com, alex.williamson@...hat.com,
        kevin.tian@...el.com, jacob.jun.pan@...ux.intel.com,
        yi.l.liu@...el.com, lorenzo.pieralisi@....com,
        shameerali.kolothum.thodi@...wei.com
Subject: Re: [PATCH RFC v1 08/15] iommu: Add asid_bits to arm smmu-v3 stage1
 table info



On 3/3/21 10:48 PM, Jean-Philippe Brucker wrote:
> On Fri, Jan 15, 2021 at 05:43:35PM +0530, Vivek Gautam wrote:
>> aisd_bits data is required to prepare stage-1 tables for arm-smmu-v3.
>>
>> Signed-off-by: Vivek Gautam <vivek.gautam@....com>
>> Cc: Joerg Roedel <joro@...tes.org>
>> Cc: Will Deacon <will.deacon@....com>
>> Cc: Robin Murphy <robin.murphy@....com>
>> Cc: Jean-Philippe Brucker <jean-philippe@...aro.org>
>> Cc: Eric Auger <eric.auger@...hat.com>
>> Cc: Alex Williamson <alex.williamson@...hat.com>
>> Cc: Kevin Tian <kevin.tian@...el.com>
>> Cc: Jacob Pan <jacob.jun.pan@...ux.intel.com>
>> Cc: Liu Yi L <yi.l.liu@...el.com>
>> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
>> Cc: Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.com>
>> ---
>>   include/uapi/linux/iommu.h | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/include/uapi/linux/iommu.h b/include/uapi/linux/iommu.h
>> index 082d758dd016..96abbfc7c643 100644
>> --- a/include/uapi/linux/iommu.h
>> +++ b/include/uapi/linux/iommu.h
>> @@ -357,7 +357,7 @@ struct iommu_pasid_smmuv3 {
>>   	__u32	version;
>>   	__u8	s1fmt;
>>   	__u8	s1dss;
>> -	__u8	padding[2];
>> +	__u16	asid_bits;
> 
> Is this used anywhere?  This struct is passed from host userspace to host
> kernel to attach the PASID table, so I don't think it needs an asid_bits
> field.

Yea, must have missed removing it from the WIP work. Will remove it.

Thanks
Vivek