diff options
| author | Catalin Marinas | 2010-08-31 14:05:22 +0200 |
|---|---|---|
| committer | Santosh Shilimkar | 2010-10-26 08:09:54 +0200 |
| commit | 9a6655e49fd98f3748bb80da20705448aad9ee57 (patch) | |
| tree | db5aba3a886712f54f4816137c4cea08b954f5c6 /arch | |
| parent | Linux 2.6.36-rc6 (diff) | |
| download | kernel-qcow2-linux-9a6655e49fd98f3748bb80da20705448aad9ee57.tar.gz kernel-qcow2-linux-9a6655e49fd98f3748bb80da20705448aad9ee57.tar.xz kernel-qcow2-linux-9a6655e49fd98f3748bb80da20705448aad9ee57.zip | |
ARM: Improve the L2 cache performance when PL310 is used
With this L2 cache controller, the cache maintenance by PA and sync
operations are atomic and do not require a "wait" loop. This patch
conditionally defines the cache_wait() function.
Since L2x0 cache controllers do not work with ARMv7 CPUs, the patch
automatically enables CACHE_PL310 when only CPU_V7 is defined.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mm/Kconfig | 8 | ||||
| -rw-r--r-- | arch/arm/mm/cache-l2x0.c | 15 |
2 files changed, 20 insertions, 3 deletions
diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig index a0a2928ae4dd..4414a01e1e8a 100644 --- a/arch/arm/mm/Kconfig +++ b/arch/arm/mm/Kconfig @@ -779,6 +779,14 @@ config CACHE_L2X0 help This option enables the L2x0 PrimeCell. +config CACHE_PL310 + bool + depends on CACHE_L2X0 + default y if CPU_V7 && !CPU_V6 + help + This option enables optimisations for the PL310 cache + controller. + config CACHE_TAUROS2 bool "Enable the Tauros2 L2 cache controller" depends on (ARCH_DOVE || ARCH_MMP) diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c index 9982eb385c0f..edb43ff7aeef 100644 --- a/arch/arm/mm/cache-l2x0.c +++ b/arch/arm/mm/cache-l2x0.c @@ -29,13 +29,22 @@ static void __iomem *l2x0_base; static DEFINE_SPINLOCK(l2x0_lock); static uint32_t l2x0_way_mask; /* Bitmask of active ways */ -static inline void cache_wait(void __iomem *reg, unsigned long mask) +static inline void cache_wait_way(void __iomem *reg, unsigned long mask) { - /* wait for the operation to complete */ + /* wait for cache operation by line or way to complete */ while (readl_relaxed(reg) & mask) ; } +#ifdef CONFIG_CACHE_PL310 +static inline void cache_wait(void __iomem *reg, unsigned long mask) +{ + /* cache operations by line are atomic on PL310 */ +} +#else +#define cache_wait cache_wait_way +#endif + static inline void cache_sync(void) { void __iomem *base = l2x0_base; @@ -110,7 +119,7 @@ static inline void l2x0_inv_all(void) /* invalidate all ways */ spin_lock_irqsave(&l2x0_lock, flags); writel_relaxed(l2x0_way_mask, l2x0_base + L2X0_INV_WAY); - cache_wait(l2x0_base + L2X0_INV_WAY, l2x0_way_mask); + cache_wait_way(l2x0_base + L2X0_INV_WAY, l2x0_way_mask); cache_sync(); spin_unlock_irqrestore(&l2x0_lock, flags); } |