On Mon, Feb 24, 2020 at 03:26:36PM -0800, Jacob Pan wrote:
> Query Shared Virtual Address/Memory capability is a generic feature.
> SVA feature check is the required first step before calling
> iommu_sva_bind_device().
>
> VT-d checks SVA feature enabling at per IOMMU level during this step,
> SVA bind device will check and enable PCI ATS, PRS, and PASID capabilities
> at device level.
>
> This patch reports Intel SVM as SVA feature such that generic code
> (e.g. Uacce [1]) can use it.
>
> [1] https://lkml.org/lkml/2020/1/15/604
>
> Signed-off-by: Jacob Pan <jacob.jun....@linux.intel.com>
Don't you also need to have has_feat(), feat_enabled() and disable_feat()
return positive values?
Thanks,
Jean
> ---
> drivers/iommu/intel-iommu.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
> index 92c2f2e4197b..5eca6e10d2a4 100644
> --- a/drivers/iommu/intel-iommu.c
> +++ b/drivers/iommu/intel-iommu.c
> @@ -6346,9 +6346,14 @@ intel_iommu_dev_has_feat(struct device *dev, enum
> iommu_dev_features feat)
> static int
> intel_iommu_dev_enable_feat(struct device *dev, enum iommu_dev_features feat)
> {
> + struct intel_iommu *intel_iommu = dev_to_intel_iommu(dev);
> +
> if (feat == IOMMU_DEV_FEAT_AUX)
> return intel_iommu_enable_auxd(dev);
>
> + if (feat == IOMMU_DEV_FEAT_SVA)
> + return intel_iommu->flags & VTD_FLAG_SVM_CAPABLE;
> +
> return -ENODEV;
> }
>
> --
> 2.7.4
>
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