diff options
| -rw-r--r-- | arch/x86/include/asm/tlbflush.h | 13 | ||||
| -rw-r--r-- | arch/x86/mm/tlb.c | 30 |
2 files changed, 37 insertions, 6 deletions
diff --git a/arch/x86/include/asm/tlbflush.h b/arch/x86/include/asm/tlbflush.h index 621b959e1dbf..b5a27bd77669 100644 --- a/arch/x86/include/asm/tlbflush.h +++ b/arch/x86/include/asm/tlbflush.h @@ -123,6 +123,12 @@ static inline void reset_lazy_tlbstate(void) { } +static inline void flush_tlb_kernel_range(unsigned long start, + unsigned long end) +{ + flush_tlb_all(); +} + #else /* SMP */ #include <asm/smp.h> @@ -139,6 +145,7 @@ extern void flush_tlb_current_task(void); extern void flush_tlb_page(struct vm_area_struct *, unsigned long); extern void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start, unsigned long end, unsigned long vmflag); +extern void flush_tlb_kernel_range(unsigned long start, unsigned long end); #define flush_tlb() flush_tlb_current_task() @@ -168,10 +175,4 @@ static inline void reset_lazy_tlbstate(void) native_flush_tlb_others(mask, mm, start, end) #endif -static inline void flush_tlb_kernel_range(unsigned long start, - unsigned long end) -{ - flush_tlb_all(); -} - #endif /* _ASM_X86_TLBFLUSH_H */ diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c index 2b5f506a7655..613cd83e8c0c 100644 --- a/arch/x86/mm/tlb.c +++ b/arch/x86/mm/tlb.c @@ -264,6 +264,36 @@ void flush_tlb_all(void) on_each_cpu(do_flush_tlb_all, NULL, 1); } +static void do_kernel_range_flush(void *info) +{ + struct flush_tlb_info *f = info; + unsigned long addr; + + /* flush range by one by one 'invlpg' */ + for (addr = f->flush_start; addr < f->flush_end; addr += PAGE_SIZE) + __flush_tlb_single(addr); +} + +void flush_tlb_kernel_range(unsigned long start, unsigned long end) +{ + unsigned act_entries; + struct flush_tlb_info info; + + /* In modern CPU, last level tlb used for both data/ins */ + act_entries = tlb_lld_4k[ENTRIES]; + + /* Balance as user space task's flush, a bit conservative */ + if (end == TLB_FLUSH_ALL || tlb_flushall_shift == -1 || + (end - start) >> PAGE_SHIFT > act_entries >> tlb_flushall_shift) + + on_each_cpu(do_flush_tlb_all, NULL, 1); + else { + info.flush_start = start; + info.flush_end = end; + on_each_cpu(do_kernel_range_flush, &info, 1); + } +} + #ifdef CONFIG_DEBUG_TLBFLUSH static ssize_t tlbflush_read_file(struct file *file, char __user *user_buf, size_t count, loff_t *ppos) |