Signed-off-by: Thomas Gleixner tglx@linutronix.de Cc: Chris Zankel chris@zankel.net Cc: Max Filippov jcmvbkbc@gmail.com Cc: linux-xtensa@linux-xtensa.org --- Note: Completely untested --- arch/xtensa/Kconfig | 1 arch/xtensa/include/asm/highmem.h | 9 +++++++ arch/xtensa/mm/highmem.c | 44 +++----------------------------------- 3 files changed, 14 insertions(+), 40 deletions(-)
--- a/arch/xtensa/Kconfig +++ b/arch/xtensa/Kconfig @@ -679,6 +679,7 @@ endchoice config HIGHMEM bool "High Memory Support" depends on MMU + select KMAP_ATOMIC_GENERIC help Linux can use the full amount of RAM in the system by default. However, the default MMUv2 setup only maps the --- a/arch/xtensa/include/asm/highmem.h +++ b/arch/xtensa/include/asm/highmem.h @@ -68,6 +68,15 @@ static inline void flush_cache_kmaps(voi flush_cache_all(); }
+enum fixed_addresses kmap_temp_map_idx(int type, unsigned long pfn); +#define arch_kmap_temp_map_idx kmap_temp_map_idx + +enum fixed_addresses kmap_temp_unmap_idx(int type, unsigned long addr); +#define arch_kmap_temp_unmap_idx kmap_temp_unmap_idx + +#define arch_kmap_temp_post_unmap(vaddr) \ + local_flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE) + void kmap_init(void);
#endif --- a/arch/xtensa/mm/highmem.c +++ b/arch/xtensa/mm/highmem.c @@ -12,8 +12,6 @@ #include <linux/highmem.h> #include <asm/tlbflush.h>
-static pte_t *kmap_pte; - #if DCACHE_WAY_SIZE > PAGE_SIZE unsigned int last_pkmap_nr_arr[DCACHE_N_COLORS]; wait_queue_head_t pkmap_map_wait_arr[DCACHE_N_COLORS]; @@ -37,55 +35,21 @@ static inline enum fixed_addresses kmap_ color; }
-void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) +enum fixed_addresses kmap_temp_map_idx(int type, unsigned long pfn) { - enum fixed_addresses idx; - unsigned long vaddr; - - idx = kmap_idx(kmap_atomic_idx_push(), - DCACHE_ALIAS(page_to_phys(page))); - vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); -#ifdef CONFIG_DEBUG_HIGHMEM - BUG_ON(!pte_none(*(kmap_pte + idx))); -#endif - set_pte(kmap_pte + idx, mk_pte(page, prot)); - - return (void *)vaddr; + return kmap_idx(type, DCACHE_ALIAS(pfn << PAGE_SHIFT); } -EXPORT_SYMBOL(kmap_atomic_high_prot);
-void kunmap_atomic_high(void *kvaddr) +enum fixed_addresses kmap_temp_unmap_idx(int type, unsigned long addr) { - if (kvaddr >= (void *)FIXADDR_START && - kvaddr < (void *)FIXADDR_TOP) { - int idx = kmap_idx(kmap_atomic_idx(), - DCACHE_ALIAS((unsigned long)kvaddr)); - - /* - * Force other mappings to Oops if they'll try to access this - * pte without first remap it. Keeping stale mappings around - * is a bad idea also, in case the page changes cacheability - * attributes or becomes a protected page in a hypervisor. - */ - pte_clear(&init_mm, kvaddr, kmap_pte + idx); - local_flush_tlb_kernel_range((unsigned long)kvaddr, - (unsigned long)kvaddr + PAGE_SIZE); - - kmap_atomic_idx_pop(); - } + return kmap_idx(type, DCACHE_ALIAS(addr)); } -EXPORT_SYMBOL(kunmap_atomic_high);
void __init kmap_init(void) { - unsigned long kmap_vstart; - /* Check if this memory layout is broken because PKMAP overlaps * page table. */ BUILD_BUG_ON(PKMAP_BASE < TLBTEMP_BASE_1 + TLBTEMP_SIZE); - /* cache the first kmap pte */ - kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN); - kmap_pte = virt_to_kpte(kmap_vstart); kmap_waitqueues_init(); }