linux-kernel - Re: [PATCH v3 4/8] iommu/vt-d: Avoid duplicated code for PASID setup

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Date:   Wed, 20 Nov 2019 22:01:21 +0100
From:   Auger Eric <eric.auger@...hat.com>
To:     Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        iommu@...ts.linux-foundation.org,
        LKML <linux-kernel@...r.kernel.org>,
        Joerg Roedel <joro@...tes.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        David Woodhouse <dwmw2@...radead.org>
Cc:     "Tian, Kevin" <kevin.tian@...el.com>,
        Raj Ashok <ashok.raj@...el.com>, Yi Liu <yi.l.liu@...el.com>,
        "Mehta, Sohil" <sohil.mehta@...el.com>
Subject: Re: [PATCH v3 4/8] iommu/vt-d: Avoid duplicated code for PASID setup

Hi Jacob,

On 11/19/19 6:56 PM, Jacob Pan wrote:
> After each setup for PASID entry, related translation caches must be
> flushed. We can combine duplicated code into one function which is less
> error prone.
> 
> Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> Reviewed-by: Lu Baolu <baolu.lu@...ux.intel.com>
> Acked-by: Lu Baolu <baolu.lu@...ux.intel.com>
I sent my R-b already on v2:
Reviewed-by: Eric Auger <eric.auger@...hat.com>

Eric
> ---
>  drivers/iommu/intel-pasid.c | 48 +++++++++++++++++----------------------------
>  1 file changed, 18 insertions(+), 30 deletions(-)
> 
> diff --git a/drivers/iommu/intel-pasid.c b/drivers/iommu/intel-pasid.c
> index e7cb0b8a7332..732bfee228df 100644
> --- a/drivers/iommu/intel-pasid.c
> +++ b/drivers/iommu/intel-pasid.c
> @@ -465,6 +465,21 @@ void intel_pasid_tear_down_entry(struct intel_iommu *iommu,
>  		devtlb_invalidation_with_pasid(iommu, dev, pasid);
>  }
>  
> +static void pasid_flush_caches(struct intel_iommu *iommu,
> +				struct pasid_entry *pte,
> +				int pasid, u16 did)
> +{
> +	if (!ecap_coherent(iommu->ecap))
> +		clflush_cache_range(pte, sizeof(*pte));
> +
> +	if (cap_caching_mode(iommu->cap)) {
> +		pasid_cache_invalidation_with_pasid(iommu, did, pasid);
> +		iotlb_invalidation_with_pasid(iommu, did, pasid);
> +	} else {
> +		iommu_flush_write_buffer(iommu);
> +	}
> +}
> +
>  /*
>   * Set up the scalable mode pasid table entry for first only
>   * translation type.
> @@ -518,16 +533,7 @@ int intel_pasid_setup_first_level(struct intel_iommu *iommu,
>  	/* Setup Present and PASID Granular Transfer Type: */
>  	pasid_set_translation_type(pte, 1);
>  	pasid_set_present(pte);
> -
> -	if (!ecap_coherent(iommu->ecap))
> -		clflush_cache_range(pte, sizeof(*pte));
> -
> -	if (cap_caching_mode(iommu->cap)) {
> -		pasid_cache_invalidation_with_pasid(iommu, did, pasid);
> -		iotlb_invalidation_with_pasid(iommu, did, pasid);
> -	} else {
> -		iommu_flush_write_buffer(iommu);
> -	}
> +	pasid_flush_caches(iommu, pte, pasid, did);
>  
>  	return 0;
>  }
> @@ -591,16 +597,7 @@ int intel_pasid_setup_second_level(struct intel_iommu *iommu,
>  	 */
>  	pasid_set_sre(pte);
>  	pasid_set_present(pte);
> -
> -	if (!ecap_coherent(iommu->ecap))
> -		clflush_cache_range(pte, sizeof(*pte));
> -
> -	if (cap_caching_mode(iommu->cap)) {
> -		pasid_cache_invalidation_with_pasid(iommu, did, pasid);
> -		iotlb_invalidation_with_pasid(iommu, did, pasid);
> -	} else {
> -		iommu_flush_write_buffer(iommu);
> -	}
> +	pasid_flush_caches(iommu, pte, pasid, did);
>  
>  	return 0;
>  }
> @@ -634,16 +631,7 @@ int intel_pasid_setup_pass_through(struct intel_iommu *iommu,
>  	 */
>  	pasid_set_sre(pte);
>  	pasid_set_present(pte);
> -
> -	if (!ecap_coherent(iommu->ecap))
> -		clflush_cache_range(pte, sizeof(*pte));
> -
> -	if (cap_caching_mode(iommu->cap)) {
> -		pasid_cache_invalidation_with_pasid(iommu, did, pasid);
> -		iotlb_invalidation_with_pasid(iommu, did, pasid);
> -	} else {
> -		iommu_flush_write_buffer(iommu);
> -	}
> +	pasid_flush_caches(iommu, pte, pasid, did);
>  
>  	return 0;
>  }
>