[linux-block.git] / include / asm-arm / tlb.h

/*
 *  linux/include/asm-arm/tlb.h
 *
 *  Copyright (C) 2002 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *  Experimentation shows that on a StrongARM, it appears to be faster
 *  to use the "invalidate whole tlb" rather than "invalidate single
 *  tlb" for this.
 *
 *  This appears true for both the process fork+exit case, as well as
 *  the munmap-large-area case.
 */
#ifndef __ASMARM_TLB_H
#define __ASMARM_TLB_H

#include <asm/cacheflush.h>
#include <asm/tlbflush.h>

#ifndef CONFIG_MMU

#include <linux/pagemap.h>
#include <asm-generic/tlb.h>

#else /* !CONFIG_MMU */

#include <asm/pgalloc.h>

/*
 * TLB handling.  This allows us to remove pages from the page
 * tables, and efficiently handle the TLB issues.
 */
struct mmu_gather {
	struct mm_struct	*mm;
	unsigned int		fullmm;
};

DECLARE_PER_CPU(struct mmu_gather, mmu_gathers);

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;
	tlb->fullmm = full_mm_flush;

	return tlb;
}

static inline void
tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
{
	if (tlb->fullmm)
		flush_tlb_mm(tlb->mm);

	/* keep the page table cache within bounds */
	check_pgt_cache();

	put_cpu_var(mmu_gathers);
}

#define tlb_remove_tlb_entry(tlb,ptep,address)	do { } while (0)

/*
 * In the case of tlb vma handling, we can optimise these away in the
 * case where we're doing a full MM flush.  When we're doing a munmap,
 * the vmas are adjusted to only cover the region to be torn down.
 */
static inline void
tlb_start_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
{
	if (!tlb->fullmm)
		flush_cache_range(vma, vma->vm_start, vma->vm_end);
}

static inline void
tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
{
	if (!tlb->fullmm)
		flush_tlb_range(vma, vma->vm_start, vma->vm_end);
}

#define tlb_remove_page(tlb,page)	free_page_and_swap_cache(page)
#define pte_free_tlb(tlb, ptep)		pte_free((tlb)->mm, ptep)
#define pmd_free_tlb(tlb, pmdp)		pmd_free((tlb)->mm, pmdp)

#define tlb_migrate_finish(mm)		do { } while (0)

#endif /* CONFIG_MMU */
#endif
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/include/asm-arm/tlb.h
	3	*
	4	* Copyright (C) 2002 Russell King
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*
	10	* Experimentation shows that on a StrongARM, it appears to be faster
	11	* to use the "invalidate whole tlb" rather than "invalidate single
	12	* tlb" for this.
	13	*
	14	* This appears true for both the process fork+exit case, as well as
	15	* the munmap-large-area case.
	16	*/
	17	#ifndef __ASMARM_TLB_H
	18	#define __ASMARM_TLB_H
	19
	20	#include <asm/cacheflush.h>
	21	#include <asm/tlbflush.h>
0157903e HC	22
	23	#ifndef CONFIG_MMU
	24
	25	#include <linux/pagemap.h>
	26	#include <asm-generic/tlb.h>
	27
	28	#else /* !CONFIG_MMU */
	29
1da177e4 LT	30	#include <asm/pgalloc.h>
	31
	32	/*
	33	* TLB handling. This allows us to remove pages from the page
	34	* tables, and efficiently handle the TLB issues.
	35	*/
	36	struct mmu_gather {
	37	struct mm_struct *mm;
1da177e4	38	unsigned int fullmm;
1da177e4 LT	39	};
	40
	41	DECLARE_PER_CPU(struct mmu_gather, mmu_gathers);
	42
	43	static inline struct mmu_gather *
	44	tlb_gather_mmu(struct mm_struct *mm, unsigned int full_mm_flush)
	45	{
15a23ffa	46	struct mmu_gather *tlb = &get_cpu_var(mmu_gathers);
1da177e4 LT	47
1da177e4 LT	48	tlb->mm = mm;
1da177e4 LT	49	tlb->fullmm = full_mm_flush;
	50
	51	return tlb;
	52	}
	53
	54	static inline void
	55	tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
	56	{
1da177e4	57	if (tlb->fullmm)
fc2acab3	58	flush_tlb_mm(tlb->mm);
1da177e4 LT	59
	60	/* keep the page table cache within bounds */
	61	check_pgt_cache();
15a23ffa HD	62
15a23ffa HD	63	put_cpu_var(mmu_gathers);
1da177e4 LT	64	}
1da177e4 LT	65
1da177e4 LT	66	#define tlb_remove_tlb_entry(tlb,ptep,address) do { } while (0)
	67
	68	/*
	69	* In the case of tlb vma handling, we can optimise these away in the
	70	* case where we're doing a full MM flush. When we're doing a munmap,
	71	* the vmas are adjusted to only cover the region to be torn down.
	72	*/
	73	static inline void
	74	tlb_start_vma(struct mmu_gather tlb, struct vm_area_struct vma)
	75	{
	76	if (!tlb->fullmm)
	77	flush_cache_range(vma, vma->vm_start, vma->vm_end);
	78	}
	79
	80	static inline void
	81	tlb_end_vma(struct mmu_gather tlb, struct vm_area_struct vma)
	82	{
	83	if (!tlb->fullmm)
	84	flush_tlb_range(vma, vma->vm_start, vma->vm_end);
	85	}
	86
	87	#define tlb_remove_page(tlb,page) free_page_and_swap_cache(page)
5e541973 BH	88	#define pte_free_tlb(tlb, ptep) pte_free((tlb)->mm, ptep)
5e541973 BH	89	#define pmd_free_tlb(tlb, pmdp) pmd_free((tlb)->mm, pmdp)
1da177e4 LT	90
	91	#define tlb_migrate_finish(mm) do { } while (0)
	92
0157903e	93	#endif /* CONFIG_MMU */
1da177e4	94	#endif