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    SubjectRe: [PATCH v2 2/8] iommu: Add attach/detach_dev_pasid domain ops
    On Fri, Mar 18, 2022 at 07:52:33PM +0800, Lu Baolu wrote:
    > On 2022/3/15 13:07, Jacob Pan wrote:
    > > From: Lu Baolu <baolu.lu@linux.intel.com>
    > >
    > > An IOMMU domain represents an address space which can be attached by
    > > devices that perform DMA within a domain. However, for platforms with
    > > PASID capability the domain attachment needs be handled at device+PASID
    > > level. There can be multiple PASIDs within a device and multiple devices
    > > attached to a given domain.
    > > This patch introduces a new IOMMU op which support device, PASID, and
    > > IOMMU domain attachment. The immediate use case is for PASID capable
    > > devices to perform DMA under DMA APIs.
    > >
    > > Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
    > > Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
    > > include/linux/iommu.h | 6 ++++++
    > > 1 file changed, 6 insertions(+)
    > >
    > > diff --git a/include/linux/iommu.h b/include/linux/iommu.h
    > > index 369f05c2a4e2..fde5b933dbe3 100644
    > > +++ b/include/linux/iommu.h
    > > @@ -227,6 +227,8 @@ struct iommu_iotlb_gather {
    > > * @aux_get_pasid: get the pasid given an aux-domain
    > > * @sva_bind: Bind process address space to device
    > > * @sva_unbind: Unbind process address space from device
    > > + * @attach_dev_pasid: attach an iommu domain to a pasid of device
    > > + * @detach_dev_pasid: detach an iommu domain from a pasid of device
    > > * @sva_get_pasid: Get PASID associated to a SVA handle
    > > * @page_response: handle page request response
    > > * @cache_invalidate: invalidate translation caches
    > > @@ -296,6 +298,10 @@ struct iommu_ops {
    > > struct iommu_sva *(*sva_bind)(struct device *dev, struct mm_struct *mm,
    > > void *drvdata);
    > > void (*sva_unbind)(struct iommu_sva *handle);
    > > + int (*attach_dev_pasid)(struct iommu_domain *domain,
    > > + struct device *dev, ioasid_t id);
    > > + void (*detach_dev_pasid)(struct iommu_domain *domain,
    > > + struct device *dev, ioasid_t id);
    >
    > As we have introduced iommu_domain_ops, these callbacks should be part
    > of the domain ops.

    +1

    Jason

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