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iommu/arm-smmu-v3: Don't issue CMD_SYNC for zero-length invalidations

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Calling arm_smmu_tlb_inv_range() with a size of zero, perhaps due to
an empty 'iommu_iotlb_gather' structure, should be a NOP. Elide the
CMD_SYNC when there is no invalidation to be performed.

Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Will Deacon 2019-08-21 12:38:15 +01:00
parent f75d8e33df
commit 7314ca8699
1 changed files with 3 additions and 0 deletions
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3
drivers/iommu/arm-smmu-v3.c
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@ -1977,6 +1977,9 @@ static void arm_smmu_tlb_inv_range(unsigned long iova, size_t size,
},
};
if (!size)
return;
if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1) {
cmd.opcode = CMDQ_OP_TLBI_NH_VA;
cmd.tlbi.asid = smmu_domain->s1_cfg.cd.asid;