Messages in this thread | | | From | "Tian, Kevin" <> | Subject | RE: [PATCH v2 2/8] iommu: Add attach/detach_dev_pasid domain ops | Date | Tue, 15 Mar 2022 10:24:49 +0000 |
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> From: Jacob Pan <jacob.jun.pan@linux.intel.com> > Sent: Tuesday, March 15, 2022 1:07 PM > > 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 > --- a/include/linux/iommu.h > +++ 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); > u32 (*sva_get_pasid)(struct iommu_sva *handle); > > int (*page_response)(struct device *dev, > -- > 2.25.1
Probably this can be combined with patch05 to demonstrate the usage together with the definition of the new ops. Then comes the vt-d specific change.
Thanks Kevin
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