mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 08:19:28 +00:00
![Uwe Zeisberger](/assets/img/avatar_default.png)
Many files include the filename at the beginning, serveral used a wrong one. Signed-off-by: Uwe Zeisberger <Uwe_Zeisberger@digi.com> Signed-off-by: Adrian Bunk <bunk@stusta.de>
148 lines
3.8 KiB
C
148 lines
3.8 KiB
C
/* include/asm-generic/tlb.h
|
|
*
|
|
* Generic TLB shootdown code
|
|
*
|
|
* Copyright 2001 Red Hat, Inc.
|
|
* Based on code from mm/memory.c Copyright Linus Torvalds and others.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
#ifndef _ASM_GENERIC__TLB_H
|
|
#define _ASM_GENERIC__TLB_H
|
|
|
|
#include <linux/swap.h>
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/tlbflush.h>
|
|
|
|
/*
|
|
* For UP we don't need to worry about TLB flush
|
|
* and page free order so much..
|
|
*/
|
|
#ifdef CONFIG_SMP
|
|
#ifdef ARCH_FREE_PTR_NR
|
|
#define FREE_PTR_NR ARCH_FREE_PTR_NR
|
|
#else
|
|
#define FREE_PTE_NR 506
|
|
#endif
|
|
#define tlb_fast_mode(tlb) ((tlb)->nr == ~0U)
|
|
#else
|
|
#define FREE_PTE_NR 1
|
|
#define tlb_fast_mode(tlb) 1
|
|
#endif
|
|
|
|
/* struct mmu_gather is an opaque type used by the mm code for passing around
|
|
* any data needed by arch specific code for tlb_remove_page.
|
|
*/
|
|
struct mmu_gather {
|
|
struct mm_struct *mm;
|
|
unsigned int nr; /* set to ~0U means fast mode */
|
|
unsigned int need_flush;/* Really unmapped some ptes? */
|
|
unsigned int fullmm; /* non-zero means full mm flush */
|
|
struct page * pages[FREE_PTE_NR];
|
|
};
|
|
|
|
/* Users of the generic TLB shootdown code must declare this storage space. */
|
|
DECLARE_PER_CPU(struct mmu_gather, mmu_gathers);
|
|
|
|
/* tlb_gather_mmu
|
|
* Return a pointer to an initialized struct mmu_gather.
|
|
*/
|
|
static inline struct mmu_gather *
|
|
tlb_gather_mmu(struct mm_struct *mm, unsigned int full_mm_flush)
|
|
{
|
|
struct mmu_gather *tlb = &get_cpu_var(mmu_gathers);
|
|
|
|
tlb->mm = mm;
|
|
|
|
/* Use fast mode if only one CPU is online */
|
|
tlb->nr = num_online_cpus() > 1 ? 0U : ~0U;
|
|
|
|
tlb->fullmm = full_mm_flush;
|
|
|
|
return tlb;
|
|
}
|
|
|
|
static inline void
|
|
tlb_flush_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
|
|
{
|
|
if (!tlb->need_flush)
|
|
return;
|
|
tlb->need_flush = 0;
|
|
tlb_flush(tlb);
|
|
if (!tlb_fast_mode(tlb)) {
|
|
free_pages_and_swap_cache(tlb->pages, tlb->nr);
|
|
tlb->nr = 0;
|
|
}
|
|
}
|
|
|
|
/* tlb_finish_mmu
|
|
* Called at the end of the shootdown operation to free up any resources
|
|
* that were required.
|
|
*/
|
|
static inline void
|
|
tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
|
|
{
|
|
tlb_flush_mmu(tlb, start, end);
|
|
|
|
/* keep the page table cache within bounds */
|
|
check_pgt_cache();
|
|
|
|
put_cpu_var(mmu_gathers);
|
|
}
|
|
|
|
/* tlb_remove_page
|
|
* Must perform the equivalent to __free_pte(pte_get_and_clear(ptep)), while
|
|
* handling the additional races in SMP caused by other CPUs caching valid
|
|
* mappings in their TLBs.
|
|
*/
|
|
static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
|
|
{
|
|
tlb->need_flush = 1;
|
|
if (tlb_fast_mode(tlb)) {
|
|
free_page_and_swap_cache(page);
|
|
return;
|
|
}
|
|
tlb->pages[tlb->nr++] = page;
|
|
if (tlb->nr >= FREE_PTE_NR)
|
|
tlb_flush_mmu(tlb, 0, 0);
|
|
}
|
|
|
|
/**
|
|
* tlb_remove_tlb_entry - remember a pte unmapping for later tlb invalidation.
|
|
*
|
|
* Record the fact that pte's were really umapped in ->need_flush, so we can
|
|
* later optimise away the tlb invalidate. This helps when userspace is
|
|
* unmapping already-unmapped pages, which happens quite a lot.
|
|
*/
|
|
#define tlb_remove_tlb_entry(tlb, ptep, address) \
|
|
do { \
|
|
tlb->need_flush = 1; \
|
|
__tlb_remove_tlb_entry(tlb, ptep, address); \
|
|
} while (0)
|
|
|
|
#define pte_free_tlb(tlb, ptep) \
|
|
do { \
|
|
tlb->need_flush = 1; \
|
|
__pte_free_tlb(tlb, ptep); \
|
|
} while (0)
|
|
|
|
#ifndef __ARCH_HAS_4LEVEL_HACK
|
|
#define pud_free_tlb(tlb, pudp) \
|
|
do { \
|
|
tlb->need_flush = 1; \
|
|
__pud_free_tlb(tlb, pudp); \
|
|
} while (0)
|
|
#endif
|
|
|
|
#define pmd_free_tlb(tlb, pmdp) \
|
|
do { \
|
|
tlb->need_flush = 1; \
|
|
__pmd_free_tlb(tlb, pmdp); \
|
|
} while (0)
|
|
|
|
#define tlb_migrate_finish(mm) do {} while (0)
|
|
|
|
#endif /* _ASM_GENERIC__TLB_H */
|