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SubjectRe: [PATCH v3 6/7] iommu/vt-d: Implement set_dev_pasid domain op
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On 2023/4/1 7:11, Jacob Pan wrote:
> Devices that use ENQCMDS to submit work on buffers mapped by DMA API
> must attach a PASID to the default domain of the device. In preparation
> for this use case, this patch implements set_dev_pasid() for the
> default_domain_ops.
>
> If the device context has not been set up prior to this call, this will
> set up the device context in addition to PASID attachment.
>
> Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
> ---
> drivers/iommu/intel/iommu.c | 21 +++++++++++++++++++++
> 1 file changed, 21 insertions(+)
>
> diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
> index 52b9d0d3a02c..1ad9c5a4bd8f 100644
> --- a/drivers/iommu/intel/iommu.c
> +++ b/drivers/iommu/intel/iommu.c
> @@ -4784,6 +4784,26 @@ static void intel_iommu_remove_dev_pasid(struct device *dev, ioasid_t pasid)
> domain_detach_iommu(dmar_domain, info->iommu);
> }
>
> +static int intel_iommu_attach_device_pasid(struct iommu_domain *domain,
> + struct device *dev, ioasid_t pasid)
> +{
> + struct device_domain_info *info = dev_iommu_priv_get(dev);
> + struct dmar_domain *dmar_domain = to_dmar_domain(domain);
> + struct intel_iommu *iommu = info->iommu;
> + int ret;
> +
> + if (!pasid_supported(iommu))
> + return -ENODEV;

As the domain ID will be set to the pasid entry, need to get a refcount
of the domain ID. Call domain_attach_iommu() here, and release it after
the pasid entry is torn down.

> + ret = prepare_domain_attach_device(domain, dev);
> + if (ret)
> + return ret;
> +
> + return dmar_domain_attach_device_pasid(dmar_domain, dev, pasid);
> +}
> +
> +
> +
> const struct iommu_ops intel_iommu_ops = {
> .capable = intel_iommu_capable,
> .domain_alloc = intel_iommu_domain_alloc,
> @@ -4803,6 +4823,7 @@ const struct iommu_ops intel_iommu_ops = {
> #endif
> .default_domain_ops = &(const struct iommu_domain_ops) {
> .attach_dev = intel_iommu_attach_device,
> + .set_dev_pasid = intel_iommu_attach_device_pasid,
> .map_pages = intel_iommu_map_pages,
> .unmap_pages = intel_iommu_unmap_pages,
> .iotlb_sync_map = intel_iommu_iotlb_sync_map,

Best regards,
baolu

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