diff options
Diffstat (limited to 'arch/arc')
| -rw-r--r-- | arch/arc/include/asm/cacheflush.h | 1 | ||||
| -rw-r--r-- | arch/arc/mm/cache_arc700.c | 9 | ||||
| -rw-r--r-- | arch/arc/mm/tlb.c | 18 |
3 files changed, 21 insertions, 7 deletions
diff --git a/arch/arc/include/asm/cacheflush.h b/arch/arc/include/asm/cacheflush.h index 65ed8d2d4597..ee1f6eae82d2 100644 --- a/arch/arc/include/asm/cacheflush.h +++ b/arch/arc/include/asm/cacheflush.h @@ -33,6 +33,7 @@ void flush_cache_all(void); void flush_icache_range(unsigned long start, unsigned long end); void __sync_icache_dcache(unsigned long paddr, unsigned long vaddr, int len); void __inv_icache_page(unsigned long paddr, unsigned long vaddr); +void __flush_dcache_page(unsigned long paddr); #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1 diff --git a/arch/arc/mm/cache_arc700.c b/arch/arc/mm/cache_arc700.c index 3a9ef63b1a97..c854cf95f706 100644 --- a/arch/arc/mm/cache_arc700.c +++ b/arch/arc/mm/cache_arc700.c @@ -457,10 +457,10 @@ static void __ic_line_inv_vaddr(unsigned long phy_start, unsigned long vaddr, * Exported APIs */ -/* TBD: use pg_arch_1 to optimize this */ void flush_dcache_page(struct page *page) { - __dc_line_op((unsigned long)page_address(page), PAGE_SIZE, OP_FLUSH); + /* Make a note that dcache is not yet flushed for this page */ + set_bit(PG_arch_1, &page->flags); } EXPORT_SYMBOL(flush_dcache_page); @@ -570,6 +570,11 @@ void __inv_icache_page(unsigned long paddr, unsigned long vaddr) __ic_line_inv_vaddr(paddr, vaddr, PAGE_SIZE); } +void __flush_dcache_page(unsigned long paddr) +{ + __dc_line_op(paddr, PAGE_SIZE, OP_FLUSH_N_INV); +} + void flush_icache_all(void) { unsigned long flags; diff --git a/arch/arc/mm/tlb.c b/arch/arc/mm/tlb.c index 086be526072a..003d69ac6ffa 100644 --- a/arch/arc/mm/tlb.c +++ b/arch/arc/mm/tlb.c @@ -418,9 +418,10 @@ void create_tlb(struct vm_area_struct *vma, unsigned long address, pte_t *ptep) local_irq_restore(flags); } -/* arch hook called by core VM at the end of handle_mm_fault( ), - * when a new PTE is entered in Page Tables or an existing one - * is modified. We aggresively pre-install a TLB entry +/* + * Called at the end of pagefault, for a userspace mapped page + * -pre-install the corresponding TLB entry into MMU + * -Finalize the delayed D-cache flush (wback+inv kernel mapping) */ void update_mmu_cache(struct vm_area_struct *vma, unsigned long vaddr_unaligned, pte_t *ptep) @@ -431,8 +432,15 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned long vaddr_unaligned, /* icache doesn't snoop dcache, thus needs to be made coherent here */ if (vma->vm_flags & VM_EXEC) { - unsigned long paddr = pte_val(*ptep) & PAGE_MASK; - __inv_icache_page(paddr, vaddr); + struct page *page = pfn_to_page(pte_pfn(*ptep)); + + /* if page was dcache dirty, flush now */ + int dirty = test_and_clear_bit(PG_arch_1, &page->flags); + if (dirty) { + unsigned long paddr = pte_val(*ptep) & PAGE_MASK; + __flush_dcache_page(paddr); + __inv_icache_page(paddr, vaddr); + } } } |