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| author | Lu Baolu <baolu.lu@linux.intel.com> | 2023-08-09 20:47:59 +0800 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2023-08-09 17:44:38 +0200 |
| commit | 37f900e7180ac67c73dcfae308625c87194025c0 (patch) | |
| tree | e05c1d25f2c15e0062a08d6114d6ca464ea70280 /drivers/iommu | |
| parent | 154786235d0156ddce9575f13e23f3169e688435 (diff) | |
| download | lwn-37f900e7180ac67c73dcfae308625c87194025c0.tar.gz lwn-37f900e7180ac67c73dcfae308625c87194025c0.zip | |
iommu/vt-d: Prepare for set_dev_pasid callback
The domain_flush_pasid_iotlb() helper function is used to flush the IOTLB
entries for a given PASID. Previously, this function assumed that
RID2PASID was only used for the first-level DMA translation. However, with
the introduction of the set_dev_pasid callback, this assumption is no
longer valid.
Add a check before using the RID2PASID for PASID invalidation. This check
ensures that the domain has been attached to a physical device before
using RID2PASID.
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/20230802212427.1497170-7-jacob.jun.pan@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/intel/iommu.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index 574021c36db5..19585800dcc9 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -1475,7 +1475,8 @@ static void domain_flush_pasid_iotlb(struct intel_iommu *iommu, unsigned long flags; spin_lock_irqsave(&domain->lock, flags); - qi_flush_piotlb(iommu, did, IOMMU_NO_PASID, addr, npages, ih); + if (!list_empty(&domain->devices)) + qi_flush_piotlb(iommu, did, IOMMU_NO_PASID, addr, npages, ih); spin_unlock_irqrestore(&domain->lock, flags); } |