linux-kernel - Re: [PATCH v2 18/24] iommu: Express DMA strictness via the domain type

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Date:   Thu, 29 Jul 2021 15:13:15 +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 18/24] iommu: Express DMA strictness via the domain
 type

Hi Robin,

On 7/28/21 11:58 PM, Robin Murphy wrote:
> diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
> index 982545234cf3..eecb5657de69 100644
> --- a/drivers/iommu/iommu.c
> +++ b/drivers/iommu/iommu.c
> @@ -136,6 +136,9 @@ static int __init iommu_subsys_init(void)
>   		}
>   	}
>   
> +	if (!iommu_default_passthrough() && !iommu_dma_strict)
> +		iommu_def_domain_type = IOMMU_DOMAIN_DMA_FQ;

iommu_dma_strict could be changed later by the vendor iommu driver via
iommu_set_dma_strict(). This seems not to be the right place to set
iommu_def_domain_type.

> +
>   	pr_info("Default domain type: %s %s\n",
>   		iommu_domain_type_str(iommu_def_domain_type),
>   		(iommu_cmd_line & IOMMU_CMD_LINE_DMA_API) ?

Best regards,
baolu