linux-kernel - Re: [PATCH RFC v1 05/15] iommu/arm-smmu-v3: Set sync op from consumer driver of cd-lib

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Date:   Fri, 12 Mar 2021 18:19:23 +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 05/15] iommu/arm-smmu-v3: Set sync op from consumer
 driver of cd-lib



On 3/3/21 10:45 PM, Jean-Philippe Brucker wrote:
> On Fri, Jan 15, 2021 at 05:43:32PM +0530, Vivek Gautam wrote:
>> Te change allows different consumers of arm-smmu-v3-cd-lib to set
>> their respective sync op for pasid entries.
>>
>> 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>
>> ---
>>   drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-cd-lib.c | 1 -
>>   drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c        | 7 +++++++
>>   2 files changed, 7 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-cd-lib.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-cd-lib.c
>> index ec37476c8d09..acaa09acecdd 100644
>> --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-cd-lib.c
>> +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-cd-lib.c
>> @@ -265,7 +265,6 @@ struct iommu_vendor_psdtable_ops arm_cd_table_ops = {
>>   	.free	 = arm_smmu_free_cd_tables,
>>   	.prepare = arm_smmu_prepare_cd,
>>   	.write	 = arm_smmu_write_ctx_desc,
>> -	.sync	 = arm_smmu_sync_cd,
>>   };
>>   
>>   struct iommu_pasid_table *arm_smmu_register_cd_table(struct device *dev,
>> 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 2f86c6ac42b6..0c644be22b4b 100644
>> --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
>> +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
>> @@ -1869,6 +1869,13 @@ static int arm_smmu_domain_finalise_s1(struct arm_smmu_domain *smmu_domain,
>>   	if (ret)
>>   		goto out_free_cd_tables;
>>   
>> +	/*
>> +	 * Strange to setup an op here?
>> +	 * cd-lib is the actual user of sync op, and therefore the platform
>> +	 * drivers should assign this sync/maintenance ops as per need.
>> +	 */
>> +	tbl->ops->sync = arm_smmu_sync_cd;
>> +
> 
> Modifying a static struct from here doesn't feel right. I think the
> interface should be roughly similar to io-pgtable since the principle is
> the same. So the sync() op should be separate from arm_cd_table_ops since
> it's a callback into the driver. Maybe pass it to
> iommu_register_pasid_table().

Sure, will take care of this.

Thanks & regards
Vivek