diff options
| author | Hiroshi Doyu <hdoyu@nvidia.com> | 2013-09-11 14:56:28 +0300 |
|---|---|---|
| committer | Dan Willemsen <dwillemsen@nvidia.com> | 2013-09-16 17:42:21 -0700 |
| commit | 441fdb7eecaa8befca2c60391fb2f0773612ed05 (patch) | |
| tree | f6c5f29937a0486588fa032c0e51c915fe309626 /drivers/iommu | |
| parent | 01650df9eec73d65750ab9074eb26f0a7f2a195e (diff) | |
iommu/tegra: smmu: Optimize alloc_ptbl
Without TEGRA_IOMMU_SMMU_LINEAR, zero initialized page table is
enough. Optimize the way to zero initialize.
Bug 1290869
Change-Id: Iaf71157c999663bc6216a9d086d2ccb093add1e6
Signed-off-by: Hiroshi Doyu <hdoyu@nvidia.com>
Reviewed-on: http://git-master/r/273152
Reviewed-by: Krishna Reddy <vdumpa@nvidia.com>
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/tegra-smmu.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c index 341f2b47a6ac..5e7deed8ec4e 100644 --- a/drivers/iommu/tegra-smmu.c +++ b/drivers/iommu/tegra-smmu.c @@ -825,6 +825,9 @@ static struct page *alloc_ptbl(struct smmu_as *as, dma_addr_t iova, bool flush) if (IS_ENABLED(CONFIG_PREEMPT) && !in_atomic()) gfp = GFP_KERNEL; + if (!IS_ENABLED(CONFIG_TEGRA_IOMMU_SMMU_LINEAR)) + gfp |= __GFP_ZERO; + /* Vacant - allocate a new page table */ dev_dbg(as->smmu->dev, "New PTBL pdn: %x\n", pdn); @@ -834,9 +837,11 @@ static struct page *alloc_ptbl(struct smmu_as *as, dma_addr_t iova, bool flush) SetPageReserved(page); ptbl = (u32 *)page_address(page); - for (i = 0; i < SMMU_PTBL_COUNT; i++) { - ptbl[i] = _PTE_VACANT(addr); - addr += SMMU_PAGE_SIZE; + if (IS_ENABLED(CONFIG_TEGRA_IOMMU_SMMU_LINEAR)) { + for (i = 0; i < SMMU_PTBL_COUNT; i++) { + ptbl[i] = _PTE_VACANT(addr); + addr += SMMU_PAGE_SIZE; + } } FLUSH_CPU_DCACHE(ptbl, page, SMMU_PTBL_SIZE); |