Re: [PATCH] iommu/amd: Allow non-ATS devices in IOMMUv2 domains

[Oded Gabbay]

Joerg,
Why amdkfd's devices are considered a non-IOMMUv2 capable devices ?
After all, they contain the IOMMUv2 H/W and use it constantly for HSA.

ODed

On Thu, Jul 30, 2015 at 1:05 PM, Joerg Roedel <joro@xxxxxxxxxx> wrote:
> From: Joerg Roedel <jroedel@xxxxxxx>
>
> With the grouping of multi-function devices a non-ATS
> capable device might also end up in the same domain as an
> IOMMUv2 capable device.
> So handle this situation gracefully and don't consider it a
> bug anymore.
>
> Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
> ---
>  drivers/iommu/amd_iommu.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
> index fa9508b..658ee39 100644
> --- a/drivers/iommu/amd_iommu.c
> +++ b/drivers/iommu/amd_iommu.c
> @@ -3318,7 +3318,12 @@ static int __flush_pasid(struct protection_domain *domain, int pasid,
>                 struct amd_iommu *iommu;
>                 int qdep;
>
> -               BUG_ON(!dev_data->ats.enabled);
> +               /*
> +                  There might be non-IOMMUv2 capable devices in an IOMMUv2
> +                * domain.
> +                */
> +               if (!dev_data->ats.enabled)
> +                       continue;
>
>                 qdep  = dev_data->ats.qdep;
>                 iommu = amd_iommu_rlookup_table[dev_data->devid];
> --
> 1.9.1
>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/