Re: [PATCH] AMD IOMMU: fix find_iommu_from_bdf_cap()

[Wei Wang <wei.wang2@amd.com>]

Acked. Thanks.
Wei

On 10/02/2012 04:33 PM, Jan Beulich wrote:
> The arguments passed for the "cap_offset" parameter get read from 16-
> bit fields, so the parameter should also have (at least) 16 bits.
>
> While fixing this I also noticed that this was yet another case where
> PCI segment information wasn't properly propagated, so a respective
> first parameter gets added to the function at once.
>
> Signed-off-by: Jan Beulich<jbeulich@suse.com>
>
> --- a/xen/drivers/passthrough/amd/iommu_acpi.c
> +++ b/xen/drivers/passthrough/amd/iommu_acpi.c
> @@ -86,12 +86,13 @@ static void __init add_ivrs_mapping_entr
>   }
>
>   static struct amd_iommu * __init find_iommu_from_bdf_cap(
> -    u16 bdf, u8 cap_offset)
> +    u16 seg, u16 bdf, u16 cap_offset)
>   {
>       struct amd_iommu *iommu;
>
>       for_each_amd_iommu ( iommu )
> -        if ( (iommu->bdf == bdf)&&  (iommu->cap_offset == cap_offset) )
> +        if ( (iommu->seg == seg)&&  (iommu->bdf == bdf)&&
> +             (iommu->cap_offset == cap_offset) )
>               return iommu;
>
>       return NULL;
> @@ -319,10 +320,11 @@ static int __init parse_ivmd_device_iomm
>       const struct acpi_ivrs_memory *ivmd_block,
>       unsigned long base, unsigned long limit, u8 iw, u8 ir)
>   {
> +    int seg = 0; /* XXX */
>       struct amd_iommu *iommu;
>
>       /* find target IOMMU */
> -    iommu = find_iommu_from_bdf_cap(ivmd_block->header.device_id,
> +    iommu = find_iommu_from_bdf_cap(seg, ivmd_block->header.device_id,
>                                       ivmd_block->aux_data);
>       if ( !iommu )
>       {
> @@ -669,7 +671,8 @@ static int __init parse_ivhd_block(const
>           return -ENODEV;
>       }
>
> -    iommu = find_iommu_from_bdf_cap(ivhd_block->header.device_id,
> +    iommu = find_iommu_from_bdf_cap(ivhd_block->pci_segment_group,
> +                                    ivhd_block->header.device_id,
>                                       ivhd_block->capability_offset);
>       if ( !iommu )
>       {
>
>
>