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 <[email protected]> --- drivers/iommu/tegra-smmu.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c index 4167863..46f5712 100644 --- a/drivers/iommu/tegra-smmu.c +++ b/drivers/iommu/tegra-smmu.c @@ -694,10 +694,8 @@ 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, -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
