diff options
Diffstat (limited to 'arch/arc/mm/tlb.c')
| -rw-r--r-- | arch/arc/mm/tlb.c | 29 |
1 files changed, 22 insertions, 7 deletions
diff --git a/arch/arc/mm/tlb.c b/arch/arc/mm/tlb.c index 003d69ac6ff..066145b5f34 100644 --- a/arch/arc/mm/tlb.c +++ b/arch/arc/mm/tlb.c @@ -421,25 +421,40 @@ void create_tlb(struct vm_area_struct *vma, unsigned long address, pte_t *ptep) /* * 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) + * -Finalize the delayed D-cache flush of kernel mapping of page due to + * flush_dcache_page(), copy_user_page() + * + * Note that flush (when done) involves both WBACK - so physical page is + * in sync as well as INV - so any non-congruent aliases don't remain */ void update_mmu_cache(struct vm_area_struct *vma, unsigned long vaddr_unaligned, pte_t *ptep) { unsigned long vaddr = vaddr_unaligned & PAGE_MASK; + unsigned long paddr = pte_val(*ptep) & PAGE_MASK; create_tlb(vma, vaddr, ptep); - /* icache doesn't snoop dcache, thus needs to be made coherent here */ - if (vma->vm_flags & VM_EXEC) { + /* + * Exec page : Independent of aliasing/page-color considerations, + * since icache doesn't snoop dcache on ARC, any dirty + * K-mapping of a code page needs to be wback+inv so that + * icache fetch by userspace sees code correctly. + * !EXEC page: If K-mapping is NOT congruent to U-mapping, flush it + * so userspace sees the right data. + * (Avoids the flush for Non-exec + congruent mapping case) + */ + if (vma->vm_flags & VM_EXEC || addr_not_cache_congruent(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); + /* wback + inv dcache lines */ + __flush_dcache_page(paddr, paddr); + + /* invalidate any existing icache lines */ + if (vma->vm_flags & VM_EXEC) + __inv_icache_page(paddr, vaddr); } } } |