diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/mips/mm/c-r4k.c | 74 |
1 files changed, 28 insertions, 46 deletions
diff --git a/arch/mips/mm/c-r4k.c b/arch/mips/mm/c-r4k.c index 738b89803a44..cf48371e5690 100644 --- a/arch/mips/mm/c-r4k.c +++ b/arch/mips/mm/c-r4k.c @@ -8,6 +8,7 @@ * Copyright (C) 1999, 2000 Silicon Graphics, Inc. */ #include <linux/init.h> +#include <linux/highmem.h> #include <linux/kernel.h> #include <linux/linkage.h> #include <linux/sched.h> @@ -318,23 +319,6 @@ static void __init r4k_blast_scache_setup(void) r4k_blast_scache = blast_scache128; } -/* - * This is former mm's flush_cache_all() which really should be - * flush_cache_vunmap these days ... - */ -static inline void local_r4k_flush_cache_all(void * args) -{ - r4k_blast_dcache(); -} - -static void r4k_flush_cache_all(void) -{ - if (!cpu_has_dc_aliases) - return; - - r4k_on_each_cpu(local_r4k_flush_cache_all, NULL, 1, 1); -} - static inline void local_r4k___flush_cache_all(void * args) { #if defined(CONFIG_CPU_LOONGSON2) @@ -423,13 +407,14 @@ static inline void local_r4k_flush_cache_page(void *args) struct flush_cache_page_args *fcp_args = args; struct vm_area_struct *vma = fcp_args->vma; unsigned long addr = fcp_args->addr; - unsigned long paddr = fcp_args->pfn << PAGE_SHIFT; + struct page *page = pfn_to_page(fcp_args->pfn); int exec = vma->vm_flags & VM_EXEC; struct mm_struct *mm = vma->vm_mm; pgd_t *pgdp; pud_t *pudp; pmd_t *pmdp; pte_t *ptep; + void *vaddr; /* * If ownes no valid ASID yet, cannot possibly have gotten @@ -451,43 +436,40 @@ static inline void local_r4k_flush_cache_page(void *args) if (!(pte_val(*ptep) & _PAGE_PRESENT)) return; - /* - * Doing flushes for another ASID than the current one is - * too difficult since stupid R4k caches do a TLB translation - * for every cache flush operation. So we do indexed flushes - * in that case, which doesn't overly flush the cache too much. - */ - if ((mm == current->active_mm) && (pte_val(*ptep) & _PAGE_VALID)) { - if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc)) { - r4k_blast_dcache_page(addr); - if (exec && !cpu_icache_snoops_remote_store) - r4k_blast_scache_page(addr); - } - if (exec) - r4k_blast_icache_page(addr); - - return; + if ((mm == current->active_mm) && (pte_val(*ptep) & _PAGE_VALID)) + vaddr = NULL; + else { + /* + * Use kmap_coherent or kmap_atomic to do flushes for + * another ASID than the current one. + */ + if (cpu_has_dc_aliases) + vaddr = kmap_coherent(page, addr); + else + vaddr = kmap_atomic(page, KM_USER0); + addr = (unsigned long)vaddr; } - /* - * Do indexed flush, too much work to get the (possible) TLB refills - * to work correctly. - */ if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc)) { - r4k_blast_dcache_page_indexed(cpu_has_pindexed_dcache ? - paddr : addr); - if (exec && !cpu_icache_snoops_remote_store) { - r4k_blast_scache_page_indexed(paddr); - } + r4k_blast_dcache_page(addr); + if (exec && !cpu_icache_snoops_remote_store) + r4k_blast_scache_page(addr); } if (exec) { - if (cpu_has_vtag_icache && mm == current->active_mm) { + if (vaddr && cpu_has_vtag_icache && mm == current->active_mm) { int cpu = smp_processor_id(); if (cpu_context(cpu, mm) != 0) drop_mmu_context(mm, cpu); } else - r4k_blast_icache_page_indexed(addr); + r4k_blast_icache_page(addr); + } + + if (vaddr) { + if (cpu_has_dc_aliases) + kunmap_coherent(); + else + kunmap_atomic(vaddr, KM_USER0); } } @@ -1279,7 +1261,7 @@ void __init r4k_cache_init(void) PAGE_SIZE - 1); else shm_align_mask = PAGE_SIZE-1; - flush_cache_all = r4k_flush_cache_all; + flush_cache_all = cache_noop; __flush_cache_all = r4k___flush_cache_all; flush_cache_mm = r4k_flush_cache_mm; flush_cache_page = r4k_flush_cache_page; |