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    Subject[PATCH 4.19 28/39] iommu/amd: Set DTE[IntTabLen] to represent 512 IRTEs
    Date
    From: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>

    commit 4165bf015ba9454f45beaad621d16c516d5c5afe upstream.

    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@redhat.com>
    Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
    Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
    Link: https://lore.kernel.org/r/20201207091920.3052-1-suravee.suthikulpanit@amd.com
    Signed-off-by: Will Deacon <will@kernel.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/iommu/amd_iommu_types.h | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/drivers/iommu/amd_iommu_types.h
    +++ b/drivers/iommu/amd_iommu_types.h
    @@ -259,7 +259,7 @@
    #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

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