diff options
| author | Lu Baolu <baolu.lu@linux.intel.com> | 2021-03-20 10:54:15 +0800 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2021-04-07 11:55:47 +0200 |
| commit | 8b74b6ab253866450c131e9134642efb40439c91 (patch) | |
| tree | 2d08db67c1e29688454bedc16ee3955455fa8477 /drivers/iommu | |
| parent | c0474a606ecb9326227b4d68059942f9db88a897 (diff) | |
iommu/vt-d: Avoid unnecessary cache flush in pasid entry teardown
When a present pasid entry is disassembled, all kinds of pasid related
caches need to be flushed. But when a pasid entry is not being used
(PRESENT bit not set), we don't need to do this. Check the PRESENT bit
in intel_pasid_tear_down_entry() and avoid flushing caches if it's not
set.
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20210320025415.641201-6-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/intel/pasid.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/iommu/intel/pasid.c b/drivers/iommu/intel/pasid.c index 8f2a702ce429..477b2e1d303c 100644 --- a/drivers/iommu/intel/pasid.c +++ b/drivers/iommu/intel/pasid.c @@ -517,6 +517,9 @@ void intel_pasid_tear_down_entry(struct intel_iommu *iommu, struct device *dev, if (WARN_ON(!pte)) return; + if (!(pte->val[0] & PASID_PTE_PRESENT)) + return; + did = pasid_get_domain_id(pte); intel_pasid_clear_entry(dev, pasid, fault_ignore); |