linux-kernel - Re: [PATCH] iommu/amd: Set DTE[IntTabLen] to represent 512 IRTEs

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Date:   Mon, 07 Dec 2020 02:28:20 -0700
From:   Jerry Snitselaar <jsnitsel@...hat.com>
To:     Suravee Suthikulpanit <suravee.suthikulpanit@....com>
Cc:     linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
        joro@...tes.org, will@...nel.org, Jon.Grimm@....com,
        brijesh.singh@....com
Subject: Re: [PATCH] iommu/amd: Set DTE[IntTabLen] to represent 512 IRTEs


Suravee Suthikulpanit @ 2020-12-07 02:19 MST:

> According to the AMD IOMMU spec, the commit 73db2fc595f3
> ("iommu/amd: Increase interrupt remapping table limit to 512 entries")
> also requires the interrupt table length (IntTabLen) to be set to 9
> (power of 2) in the device table mapping entry (DTE).
>
> Fixes: 73db2fc595f3 ("iommu/amd: Increase interrupt remapping table limit to 512 entries")
> Reported-by: Jerry Snitselaar <jsnitsel@...hat.com>
> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
> ---
>  drivers/iommu/amd/amd_iommu_types.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/iommu/amd/amd_iommu_types.h b/drivers/iommu/amd/amd_iommu_types.h
> index 89647700bab2..494b42a31b7a 100644
> --- a/drivers/iommu/amd/amd_iommu_types.h
> +++ b/drivers/iommu/amd/amd_iommu_types.h
> @@ -257,7 +257,7 @@
>  #define DTE_IRQ_REMAP_INTCTL_MASK	(0x3ULL << 60)
>  #define DTE_IRQ_TABLE_LEN_MASK	(0xfULL << 1)
>  #define DTE_IRQ_REMAP_INTCTL    (2ULL << 60)
> -#define DTE_IRQ_TABLE_LEN       (8ULL << 1)
> +#define DTE_IRQ_TABLE_LEN       (9ULL << 1)
>  #define DTE_IRQ_REMAP_ENABLE    1ULL
>  
>  #define PAGE_MODE_NONE    0x00

Reviewed-by: Jerry Snitselaar <jsnitsel@...hat.com>