[linux-2.6-block.git] / arch / um / include / asm / tlb.h

#ifndef __UM_TLB_H
#define __UM_TLB_H

#include <linux/pagemap.h>
#include <linux/swap.h>
#include <asm/percpu.h>
#include <asm/pgalloc.h>
#include <asm/tlbflush.h>

#define tlb_start_vma(tlb, vma) do { } while (0)
#define tlb_end_vma(tlb, vma) do { } while (0)
#define tlb_flush(tlb) flush_tlb_mm((tlb)->mm)

/* 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		need_flush; /* Really unmapped some ptes? */
	unsigned long		start;
	unsigned long		end;
	unsigned int		fullmm; /* non-zero means full mm flush */
};

/* Users of the generic TLB shootdown code must declare this storage space. */
DECLARE_PER_CPU(struct mmu_gather, mmu_gathers);

static inline void __tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep,
					  unsigned long address)
{
	if (tlb->start > address)
		tlb->start = address;
	if (tlb->end < address + PAGE_SIZE)
		tlb->end = address + PAGE_SIZE;
}

static inline void init_tlb_gather(struct mmu_gather *tlb)
{
	tlb->need_flush = 0;

	tlb->start = TASK_SIZE;
	tlb->end = 0;

	if (tlb->fullmm) {
		tlb->start = 0;
		tlb->end = TASK_SIZE;
	}
}

/* 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;
	tlb->fullmm = full_mm_flush;

	init_tlb_gather(tlb);

	return tlb;
}

extern void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
			       unsigned long end);

static inline void
tlb_flush_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
{
	if (!tlb->need_flush)
		return;

	flush_tlb_mm_range(tlb->mm, tlb->start, tlb->end);
	init_tlb_gather(tlb);
}

/* 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;
	free_page_and_swap_cache(page);
	return;
}

/**
 * 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) __pte_free_tlb(tlb, ptep)

#define pud_free_tlb(tlb, pudp) __pud_free_tlb(tlb, pudp)

#define pmd_free_tlb(tlb, pmdp) __pmd_free_tlb(tlb, pmdp)

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

#endif
Commit	Line	Data
1da177e4 LT	1	#ifndef __UM_TLB_H
	2	#define __UM_TLB_H
	3
1f4deba8	4	#include <linux/pagemap.h>
0b4e273f JD	5	#include <linux/swap.h>
	6	#include <asm/percpu.h>
	7	#include <asm/pgalloc.h>
	8	#include <asm/tlbflush.h>
	9
	10	#define tlb_start_vma(tlb, vma) do { } while (0)
	11	#define tlb_end_vma(tlb, vma) do { } while (0)
	12	#define tlb_flush(tlb) flush_tlb_mm((tlb)->mm)
	13
	14	/* struct mmu_gather is an opaque type used by the mm code for passing around
	15	* any data needed by arch specific code for tlb_remove_page.
	16	*/
	17	struct mmu_gather {
	18	struct mm_struct *mm;
	19	unsigned int need_flush; /* Really unmapped some ptes? */
	20	unsigned long start;
	21	unsigned long end;
	22	unsigned int fullmm; /* non-zero means full mm flush */
	23	};
	24
	25	/* Users of the generic TLB shootdown code must declare this storage space. */
	26	DECLARE_PER_CPU(struct mmu_gather, mmu_gathers);
	27
	28	static inline void __tlb_remove_tlb_entry(struct mmu_gather tlb, pte_t ptep,
	29	unsigned long address)
	30	{
	31	if (tlb->start > address)
	32	tlb->start = address;
	33	if (tlb->end < address + PAGE_SIZE)
	34	tlb->end = address + PAGE_SIZE;
	35	}
	36
	37	static inline void init_tlb_gather(struct mmu_gather *tlb)
	38	{
	39	tlb->need_flush = 0;
	40
	41	tlb->start = TASK_SIZE;
	42	tlb->end = 0;
	43
	44	if (tlb->fullmm) {
	45	tlb->start = 0;
	46	tlb->end = TASK_SIZE;
	47	}
	48	}
	49
	50	/* tlb_gather_mmu
	51	* Return a pointer to an initialized struct mmu_gather.
	52	*/
	53	static inline struct mmu_gather *
	54	tlb_gather_mmu(struct mm_struct *mm, unsigned int full_mm_flush)
	55	{
	56	struct mmu_gather *tlb = &get_cpu_var(mmu_gathers);
	57
	58	tlb->mm = mm;
	59	tlb->fullmm = full_mm_flush;
	60
	61	init_tlb_gather(tlb);
	62
	63	return tlb;
	64	}
	65
	66	extern void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
	67	unsigned long end);
	68
69	static inline void
70	tlb_flush_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
71	{
72	if (!tlb->need_flush)
73	return;
74
75	flush_tlb_mm_range(tlb->mm, tlb->start, tlb->end);
76	init_tlb_gather(tlb);
77	}
78
79	/* tlb_finish_mmu
80	* Called at the end of the shootdown operation to free up any resources
81	* that were required.
82	*/
83	static inline void
84	tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
85	{
86	tlb_flush_mmu(tlb, start, end);
87
88	/* keep the page table cache within bounds */
89	check_pgt_cache();
90
91	put_cpu_var(mmu_gathers);
92	}
93
94	/* tlb_remove_page
95	* Must perform the equivalent to __free_pte(pte_get_and_clear(ptep)),
96	* while handling the additional races in SMP caused by other CPUs
97	* caching valid mappings in their TLBs.
98	*/
99	static inline void tlb_remove_page(struct mmu_gather tlb, struct page page)
100	{
101	tlb->need_flush = 1;
102	free_page_and_swap_cache(page);
103	return;
104	}
105
106	/**
107	* tlb_remove_tlb_entry - remember a pte unmapping for later tlb invalidation.
108	*
109	* Record the fact that pte's were really umapped in ->need_flush, so we can
110	* later optimise away the tlb invalidate. This helps when userspace is
111	* unmapping already-unmapped pages, which happens quite a lot.
112	*/
113	#define tlb_remove_tlb_entry(tlb, ptep, address) \
114	do { \
115	tlb->need_flush = 1; \
116	__tlb_remove_tlb_entry(tlb, ptep, address); \
117	} while (0)
118
119	#define pte_free_tlb(tlb, ptep) __pte_free_tlb(tlb, ptep)
120
121	#define pud_free_tlb(tlb, pudp) __pud_free_tlb(tlb, pudp)
122
123	#define pmd_free_tlb(tlb, pmdp) __pmd_free_tlb(tlb, pmdp)
124
125	#define tlb_migrate_finish(mm) do {} while (0)
1da177e4 LT	126
1da177e4 LT	127	#endif