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iommu/tegra: smmu: Remove unnecessary PTC/TLB flush all

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smmu_flush_regs() does TLB/PTC flush all when freeing a second level
page table. This isn't necessay at all since each pte entry has been
already maintained by address in the above flush_ptc_and_tlb().

Signed-off-by: Hiroshi Doyu <hdoyu@nvidia.com>
Signed-off-by: Joerg Roedel <joro@8bytes.org>
This commit is contained in:
Hiroshi Doyu 2012-11-28 15:52:53 +02:00 committed by Joerg Roedel
parent 9489e9dcae
commit 37683e4562
1 changed files with 1 additions and 3 deletions
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4
drivers/iommu/tegra-smmu.c
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@ -696,10 +696,8 @@ static void __smmu_iommu_unmap(struct smmu_as *as, dma_addr_t iova)
*pte = _PTE_VACANT(iova);
FLUSH_CPU_DCACHE(pte, page, sizeof(*pte));
flush_ptc_and_tlb(as->smmu, as, iova, pte, page, 0);
if (!--(*count)) {
if (!--(*count))
free_ptbl(as, iova);
smmu_flush_regs(as->smmu, 0);
}
}
static void __smmu_iommu_map_pfn(struct smmu_as *as, dma_addr_t iova,