summaryrefslogtreecommitdiffstats
path: root/include/asm-sparc64/tlb.h
blob: 169309bdbf82d3d23f293f26ca2023a22d554ba8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
#ifndef _SPARC64_TLB_H
#define _SPARC64_TLB_H

#include <linux/config.h>
#include <linux/swap.h>
#include <asm/pgalloc.h>
#include <asm/tlbflush.h>
#include <asm/mmu_context.h>

#define TLB_BATCH_NR	192

/*
 * For UP we don't need to worry about TLB flush
 * and page free order so much..
 */
#ifdef CONFIG_SMP
  #define FREE_PTE_NR	506
  #define tlb_fast_mode(bp) ((bp)->pages_nr == ~0U)
#else
  #define FREE_PTE_NR	1
  #define tlb_fast_mode(bp) 1
#endif

struct mmu_gather {
	struct mm_struct *mm;
	unsigned int pages_nr;
	unsigned int need_flush;
	unsigned int tlb_frozen;
	unsigned int tlb_nr;
	unsigned long freed;
	unsigned long vaddrs[TLB_BATCH_NR];
	struct page *pages[FREE_PTE_NR];
};

DECLARE_PER_CPU(struct mmu_gather, mmu_gathers);

#ifdef CONFIG_SMP
extern void smp_flush_tlb_pending(struct mm_struct *,
				  unsigned long, unsigned long *);
#endif

extern void __flush_tlb_pending(unsigned long, unsigned long, unsigned long *);
extern void flush_tlb_pending(void);

static inline struct mmu_gather *tlb_gather_mmu(struct mm_struct *mm, unsigned int full_mm_flush)
{
	struct mmu_gather *mp = &get_cpu_var(mmu_gathers);

	BUG_ON(mp->tlb_nr);

	mp->mm = mm;
	mp->pages_nr = num_online_cpus() > 1 ? 0U : ~0U;
	mp->tlb_frozen = full_mm_flush;
	mp->freed = 0;

	return mp;
}


static inline void tlb_flush_mmu(struct mmu_gather *mp)
{
	if (mp->need_flush) {
		mp->need_flush = 0;
		if (!tlb_fast_mode(mp)) {
			free_pages_and_swap_cache(mp->pages, mp->pages_nr);
			mp->pages_nr = 0;
		}
	}

}

#ifdef CONFIG_SMP
extern void smp_flush_tlb_mm(struct mm_struct *mm);
#define do_flush_tlb_mm(mm) smp_flush_tlb_mm(mm)
#else
#define do_flush_tlb_mm(mm) __flush_tlb_mm(CTX_HWBITS(mm->context), SECONDARY_CONTEXT)
#endif

static inline void tlb_finish_mmu(struct mmu_gather *mp, unsigned long start, unsigned long end)
{
	unsigned long freed = mp->freed;
	struct mm_struct *mm = mp->mm;
	unsigned long rss = get_mm_counter(mm, rss);

	if (rss < freed)
		freed = rss;
	add_mm_counter(mm, rss, -freed);

	tlb_flush_mmu(mp);

	if (mp->tlb_frozen) {
		if (CTX_VALID(mm->context))
			do_flush_tlb_mm(mm);
		mp->tlb_frozen = 0;
	} else
		flush_tlb_pending();

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

	put_cpu_var(mmu_gathers);
}

static inline unsigned int tlb_is_full_mm(struct mmu_gather *mp)
{
	return mp->tlb_frozen;
}

static inline void tlb_remove_page(struct mmu_gather *mp, struct page *page)
{
	mp->need_flush = 1;
	if (tlb_fast_mode(mp)) {
		free_page_and_swap_cache(page);
		return;
	}
	mp->pages[mp->pages_nr++] = page;
	if (mp->pages_nr >= FREE_PTE_NR)
		tlb_flush_mmu(mp);
}

#define tlb_remove_tlb_entry(mp,ptep,addr) do { } while (0)
#define pte_free_tlb(mp,ptepage) pte_free(ptepage)
#define pmd_free_tlb(mp,pmdp) pmd_free(pmdp)
#define pud_free_tlb(tlb,pudp) __pud_free_tlb(tlb,pudp)

#define tlb_migrate_finish(mm)	do { } while (0)
#define tlb_start_vma(tlb, vma) do { } while (0)
#define tlb_end_vma(tlb, vma)	do { } while (0)

#endif /* _SPARC64_TLB_H */