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iommu: Avoid unnecessary cache invalidations 

The iommu_create_device_direct_mappings() only needs to flush the caches
when the mappings are changed in the affected domain. This is not true
for non-DMA domains, or for devices attached to the domain that have no
reserved regions. To avoid unnecessary cache invalidations, add a check
before iommu_flush_iotlb_all().

Fixes: a48ce36e27 ("iommu: Prevent RESV_DIRECT devices from blocking domains")
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Tested-by: Henry Willard <henry.willard@oracle.com>
Link: https://lore.kernel.org/r/20231026084942.17387-1-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Lu Baolu 2023-10-26 16:49:42 +08:00 committed by Joerg Roedel
parent 05d3ef8bba
commit 6e6c6d6bc6
1 changed files with 2 additions and 1 deletions
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3
drivers/iommu/iommu.c
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@ -1108,7 +1108,8 @@ map_end:
}
iommu_flush_iotlb_all(domain);
if (!list_empty(&mappings) && iommu_is_dma_domain(domain))
iommu_flush_iotlb_all(domain);
out:
iommu_put_resv_regions(dev, &mappings);