linux-kernel - Re: [RFC PATCH v6 04/20] iommu/arm-smmu: add capability IOMMU_CAP_INTR

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Date:	Sun, 8 Jun 2014 12:31:29 +0200
From:	Christoffer Dall <christoffer.dall@...aro.org>
To:	Antonios Motakis <a.motakis@...tualopensystems.com>
Cc:	alex.williamson@...hat.com, kvmarm@...ts.cs.columbia.edu,
	iommu@...ts.linux-foundation.org, tech@...tualopensystems.com,
	a.rigo@...tualopensystems.com, kvm@...r.kernel.org,
	will.deacon@....com, kim.phillips@...escale.com,
	stuart.yoder@...escale.com, eric.auger@...aro.org,
	Joerg Roedel <joro@...tes.org>,
	"moderated list:ARM SMMU DRIVER" 
	<linux-arm-kernel@...ts.infradead.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v6 04/20] iommu/arm-smmu: add capability
 IOMMU_CAP_INTR_REMAP

On Thu, Jun 05, 2014 at 07:03:12PM +0200, Antonios Motakis wrote:
> With an ARM SMMU, interrupt remapping should always be safe from the
> SMMU's point of view, as it is properly handled by the GIC.
> 
> Signed-off-by: Antonios Motakis <a.motakis@...tualopensystems.com>
> ---
>  drivers/iommu/arm-smmu.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
> index 15ab2af..ff29402 100644
> --- a/drivers/iommu/arm-smmu.c
> +++ b/drivers/iommu/arm-smmu.c
> @@ -1544,7 +1544,7 @@ static int arm_smmu_domain_has_cap(struct iommu_domain *domain,
>  	if (smmu_domain->root_cfg.smmu->features & ARM_SMMU_FEAT_COHERENT_WALK)
>  		caps |= IOMMU_CAP_CACHE_COHERENCY;
>  
> -	caps |= IOMMU_CAP_NOEXEC;
> +	caps |= IOMMU_CAP_NOEXEC | IOMMU_CAP_INTR_REMAP;
>  
>  	return !!(cap & caps);
>  }
> -- 
> 1.8.3.2
> 
What does IOMMU_CAP_INTR_REMAP signify exactly?  Is there docs/examples
somewhere I can look at?  (A quick scan of the Linux souce code doesn't
reveal much, and I'm not sure if this is purely MSI related or what...)

Thanks,
-Christoffer
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