From 444457c1f59d58bc48acf5b4fc585225106c11ff Mon Sep 17 00:00:00 2001 From: Santosh Shilimkar Date: Sun, 11 Jul 2010 14:58:41 +0530 Subject: [PATCH] ARM: l2x0: Optimise the range based operations For the big buffers which are in excess of cache size, the maintaince operations by PA are very slow. For such buffers the maintainace operations can be speeded up by using the WAY based method. Signed-off-by: Santosh Shilimkar Acked-by: Catalin Marinas Acked-by: Linus Walleij --- arch/arm/mm/cache-l2x0.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c index 262c7529bcdb..170c9bb95866 100644 --- a/arch/arm/mm/cache-l2x0.c +++ b/arch/arm/mm/cache-l2x0.c @@ -125,6 +125,18 @@ static void l2x0_flush_all(void) spin_unlock_irqrestore(&l2x0_lock, flags); } +static void l2x0_clean_all(void) +{ + unsigned long flags; + + /* clean all ways */ + spin_lock_irqsave(&l2x0_lock, flags); + writel_relaxed(l2x0_way_mask, l2x0_base + L2X0_CLEAN_WAY); + cache_wait_way(l2x0_base + L2X0_CLEAN_WAY, l2x0_way_mask); + cache_sync(); + spin_unlock_irqrestore(&l2x0_lock, flags); +} + static void l2x0_inv_all(void) { unsigned long flags; @@ -183,6 +195,11 @@ static void l2x0_clean_range(unsigned long start, unsigned long end) void __iomem *base = l2x0_base; unsigned long flags; + if ((end - start) >= l2x0_size) { + l2x0_clean_all(); + return; + } + spin_lock_irqsave(&l2x0_lock, flags); start &= ~(CACHE_LINE_SIZE - 1); while (start < end) { @@ -208,6 +225,11 @@ static void l2x0_flush_range(unsigned long start, unsigned long end) void __iomem *base = l2x0_base; unsigned long flags; + if ((end - start) >= l2x0_size) { + l2x0_flush_all(); + return; + } + spin_lock_irqsave(&l2x0_lock, flags); start &= ~(CACHE_LINE_SIZE - 1); while (start < end) { -- 2.34.1