diff options
Diffstat (limited to 'arch/arm/mm/flush.c')
| -rw-r--r-- | arch/arm/mm/flush.c | 37 |
1 files changed, 35 insertions, 2 deletions
diff --git a/arch/arm/mm/flush.c b/arch/arm/mm/flush.c index c6de48d8950..4085ed983e4 100644 --- a/arch/arm/mm/flush.c +++ b/arch/arm/mm/flush.c @@ -13,6 +13,29 @@ #include <asm/cacheflush.h> #include <asm/system.h> +#include <asm/tlbflush.h> + +#ifdef CONFIG_CPU_CACHE_VIPT +#define ALIAS_FLUSH_START 0xffff4000 + +#define TOP_PTE(x) pte_offset_kernel(top_pmd, x) + +static void flush_pfn_alias(unsigned long pfn, unsigned long vaddr) +{ + unsigned long to = ALIAS_FLUSH_START + (CACHE_COLOUR(vaddr) << PAGE_SHIFT); + + set_pte(TOP_PTE(to), pfn_pte(pfn, PAGE_KERNEL)); + flush_tlb_kernel_page(to); + + asm( "mcrr p15, 0, %1, %0, c14\n" + " mcrr p15, 0, %1, %0, c5\n" + : + : "r" (to), "r" (to + PAGE_SIZE - L1_CACHE_BYTES) + : "cc"); +} +#else +#define flush_pfn_alias(pfn,vaddr) do { } while (0) +#endif static void __flush_dcache_page(struct address_space *mapping, struct page *page) { @@ -37,6 +60,18 @@ static void __flush_dcache_page(struct address_space *mapping, struct page *page return; /* + * This is a page cache page. If we have a VIPT cache, we + * only need to do one flush - which would be at the relevant + * userspace colour, which is congruent with page->index. + */ + if (cache_is_vipt()) { + if (cache_is_vipt_aliasing()) + flush_pfn_alias(page_to_pfn(page), + page->index << PAGE_CACHE_SHIFT); + return; + } + + /* * There are possible user space mappings of this page: * - VIVT cache: we need to also write back and invalidate all user * data in the current VM view associated with this page. @@ -57,8 +92,6 @@ static void __flush_dcache_page(struct address_space *mapping, struct page *page continue; offset = (pgoff - mpnt->vm_pgoff) << PAGE_SHIFT; flush_cache_page(mpnt, mpnt->vm_start + offset, page_to_pfn(page)); - if (cache_is_vipt()) - break; } flush_dcache_mmap_unlock(mapping); } |