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| author |   Lu Baolu <baolu.lu@linux.intel.com> | 2024-09-02 10:27:16 +0800 |
|---|---|---|
| committer |   Joerg Roedel <jroedel@suse.de> | 2024-09-02 18:14:57 +0200 |
| commit | 2031c469f8161abe74189cb74f50da224f340b71 (patch) | |
| tree | 35f347a59ab93a604d8f4afa8e673ce9b0baa4c8 /drivers/iommu/intel/svm.c | |
| parent | iommu/vt-d: Factor out helpers from domain_context_mapping_one() (diff) | |
| download | wireguard-linux-2031c469f8161abe74189cb74f50da224f340b71.tar.xz wireguard-linux-2031c469f8161abe74189cb74f50da224f340b71.zip | |
iommu/vt-d: Add support for static identity domain
Software determines VT-d hardware support for passthrough translation by
inspecting the capability register. If passthrough translation is not
supported, the device is instructed to use DMA domain for its default
domain.
Add a global static identity domain with guaranteed attach semantics for
IOMMUs that support passthrough translation mode.
The global static identity domain is a dummy domain without corresponding
dmar_domain structure. Consequently, the device's info->domain will be
NULL with the identity domain is attached. Refactor the code accordingly.
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/20240809055431.36513-7-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/intel/svm.c')
| -rw-r--r-- | drivers/iommu/intel/svm.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c index 0e3a9b38bef2..ef12e95e400a 100644 --- a/drivers/iommu/intel/svm.c +++ b/drivers/iommu/intel/svm.c @@ -311,7 +311,7 @@ void intel_drain_pasid_prq(struct device *dev, u32 pasid) domain = info->domain; pdev = to_pci_dev(dev); sid = PCI_DEVID(info->bus, info->devfn); - did = domain_id_iommu(domain, iommu); + did = domain ? domain_id_iommu(domain, iommu) : FLPT_DEFAULT_DID; qdep = pci_ats_queue_depth(pdev); /* |