From 37fbe8faa94fa8cae889a3a793fd7b32508b26ab Mon Sep 17 00:00:00 2001 From: Huacai Chen Date: Thu, 3 Mar 2016 09:45:10 +0800 Subject: [PATCH] MIPS: Loongson-3: Set cache flush handlers to cache_noop Loongson-3 maintains cache coherency by hardware, this means: 1) It's icache is coherent with dcache. 2) It's dcaches don't alias (maybe depend on PAGE_SIZE). 3) It maintains cache coherency across cores (and for DMA). So we can skip most cache flush operations by setting relevant handlers to `cache_noop' in `r4k_cache_init'. Signed-off-by: Huacai Chen Cc: Aurelien Jarno Cc: Steven J . Hill Cc: Fuxin Zhang Cc: Zhangjin Wu Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/12752/ Signed-off-by: Ralf Baechle --- arch/mips/mm/c-r4k.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/arch/mips/mm/c-r4k.c b/arch/mips/mm/c-r4k.c index 77fbaf1cdfd6..3415d3e2a63b 100644 --- a/arch/mips/mm/c-r4k.c +++ b/arch/mips/mm/c-r4k.c @@ -1796,6 +1796,20 @@ void r4k_cache_init(void) /* Optimization: an L2 flush implicitly flushes the L1 */ current_cpu_data.options |= MIPS_CPU_INCLUSIVE_CACHES; break; + case CPU_LOONGSON3: + /* Loongson-3 maintains cache coherency by hardware */ + __flush_cache_all = cache_noop; + __flush_cache_vmap = cache_noop; + __flush_cache_vunmap = cache_noop; + __flush_kernel_vmap_range = (void *)cache_noop; + flush_cache_mm = (void *)cache_noop; + flush_cache_page = (void *)cache_noop; + flush_cache_range = (void *)cache_noop; + flush_cache_sigtramp = (void *)cache_noop; + flush_icache_all = (void *)cache_noop; + flush_data_cache_page = (void *)cache_noop; + local_flush_data_cache_page = (void *)cache_noop; + break; } } -- 2.20.1