This patch removes reading of REG_MMU_VERSION register on every tlb operation and caches SYSMMU version in driver's internal data.
Signed-off-by: Marek Szyprowski m.szyprowski@samsung.com --- drivers/iommu/exynos-iommu.c | 13 +++++-------- 1 file changed, 5 insertions(+), 8 deletions(-)
diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c index 64b3bc8..8927923 100644 --- a/drivers/iommu/exynos-iommu.c +++ b/drivers/iommu/exynos-iommu.c @@ -213,6 +213,7 @@ struct sysmmu_drvdata { spinlock_t lock; struct iommu_domain *domain; phys_addr_t pgtable; + int version; };
static bool set_sysmmu_active(struct sysmmu_drvdata *data) @@ -239,11 +240,6 @@ static void sysmmu_unblock(void __iomem *sfrbase) __raw_writel(CTRL_ENABLE, sfrbase + REG_MMU_CTRL); }
-static unsigned int __raw_sysmmu_version(struct sysmmu_drvdata *data) -{ - return MMU_RAW_VER(__raw_readl(data->sfrbase + REG_MMU_VERSION)); -} - static bool sysmmu_block(void __iomem *sfrbase) { int i = 120; @@ -403,7 +399,7 @@ static void __sysmmu_init_config(struct sysmmu_drvdata *data) unsigned int cfg = CFG_LRU | CFG_QOS(15); unsigned int ver;
- ver = __raw_sysmmu_version(data); + ver = MMU_RAW_VER(__raw_readl(data->sfrbase + REG_MMU_VERSION)); if (MMU_MAJ_VER(ver) == 3) { if (MMU_MIN_VER(ver) >= 2) { cfg |= CFG_FLPDCACHE; @@ -417,6 +413,7 @@ static void __sysmmu_init_config(struct sysmmu_drvdata *data) }
__raw_writel(cfg, data->sfrbase + REG_MMU_CFG); + data->version = ver; }
static void __sysmmu_enable_nocount(struct sysmmu_drvdata *data) @@ -526,7 +523,7 @@ static bool exynos_sysmmu_disable(struct device *dev) static void __sysmmu_tlb_invalidate_flpdcache(struct sysmmu_drvdata *data, sysmmu_iova_t iova) { - if (__raw_sysmmu_version(data) == MAKE_MMU_VER(3, 3)) + if (data->version == MAKE_MMU_VER(3, 3)) __raw_writel(iova | 0x1, data->sfrbase + REG_MMU_FLUSH_ENTRY); }
@@ -575,7 +572,7 @@ static void sysmmu_tlb_invalidate_entry(struct device *dev, sysmmu_iova_t iova, * 1MB page can be cached in one of all sets. * 64KB page can be one of 16 consecutive sets. */ - if (MMU_MAJ_VER(__raw_sysmmu_version(data)) == 2) + if (MMU_MAJ_VER(data->version) == 2) num_inv = min_t(unsigned int, size / PAGE_SIZE, 64);
if (sysmmu_block(data->sfrbase)) {