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| author | Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> | 2012-09-07 09:39:15 +0400 |
|---|---|---|
| committer | Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> | 2012-09-25 14:20:26 +0400 |
| commit | e6b866e954a7f0d0144a951c158f3922dac1e6b9 (patch) | |
| tree | 9d0cbf02117228da9bda0071f2f949109a16f65b | |
| parent | dbee0c6fb4c1269b2dfc8b0b7a29907ea7fed560 (diff) | |
| download | linux-e6b866e954a7f0d0144a951c158f3922dac1e6b9.tar.xz | |
ARM: kernel: update __cpu_disable to use cache LoUIS maintenance API
When a CPU is hotplugged out caches that reside in its power domain
lose their contents and so must be cleaned to the next memory level.
Currently, __cpu_disable calls flush_cache_all() that for new generation
processor like A15/A7 ends up cleaning and invalidating all cache levels
up to Level of Coherency, which includes the unified L2.
This ends up being a waste of cycles since the L2 cache contents are not
lost on power down.
This patch updates __cpu_disable to use the new LoUIS API cache operations.
Acked-by: Nicolas Pitre <nico@linaro.org>
Reviewed-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
| -rw-r--r-- | arch/arm/kernel/smp.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c index ebd8ad274d76..199558b9462e 100644 --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -134,8 +134,11 @@ int __cpu_disable(void) /* * Flush user cache and TLB mappings, and then remove this CPU * from the vm mask set of all processes. + * + * Caches are flushed to the Level of Unification Inner Shareable + * to write-back dirty lines to unified caches shared by all CPUs. */ - flush_cache_all(); + flush_cache_louis(); local_flush_tlb_all(); clear_tasks_mm_cpumask(cpu); |