linux-kernel - Re: [PATCH v2 04/24] iommu/vt-d: Drop IOVA cookie management

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Date:   Fri, 30 Jul 2021 14:07:02 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Robin Murphy <robin.murphy@....com>, joro@...tes.org,
        will@...nel.org
Cc:     baolu.lu@...ux.intel.com, iommu@...ts.linux-foundation.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        suravee.suthikulpanit@....com, john.garry@...wei.com,
        dianders@...omium.org
Subject: Re: [PATCH v2 04/24] iommu/vt-d: Drop IOVA cookie management

On 7/28/21 11:58 PM, Robin Murphy wrote:
> The core code bakes its own cookies now.
> 
> Signed-off-by: Robin Murphy <robin.murphy@....com>
> ---
>   drivers/iommu/intel/iommu.c | 8 --------
>   1 file changed, 8 deletions(-)
> 
> diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
> index c12cc955389a..7e168634c433 100644
> --- a/drivers/iommu/intel/iommu.c
> +++ b/drivers/iommu/intel/iommu.c
> @@ -1979,10 +1979,6 @@ static void domain_exit(struct dmar_domain *domain)
>   	/* Remove associated devices and clear attached or cached domains */
>   	domain_remove_dev_info(domain);
>   
> -	/* destroy iovas */
> -	if (domain->domain.type == IOMMU_DOMAIN_DMA)
> -		iommu_put_dma_cookie(&domain->domain);
> -
>   	if (domain->pgd) {
>   		struct page *freelist;
>   
> @@ -4544,10 +4540,6 @@ static struct iommu_domain *intel_iommu_domain_alloc(unsigned type)
>   			return NULL;
>   		}
>   
> -		if (type == IOMMU_DOMAIN_DMA &&
> -		    iommu_get_dma_cookie(&dmar_domain->domain))
> -			return NULL;
> -
>   		domain = &dmar_domain->domain;
>   		domain->geometry.aperture_start = 0;
>   		domain->geometry.aperture_end   =
> 


Reviewed-by: Lu Baolu <baolu.lu@...ux.intel.com>

Best regards,
baolu