summaryrefslogtreecommitdiffstats
path: root/include/asm-s390/tlb.h
blob: 618693cfc10f2047b710378210c4842d671f2678 (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
131
#ifndef _S390_TLB_H
#define _S390_TLB_H

/*
 * TLB flushing on s390 is complicated. The following requirement
 * from the principles of operation is the most arduous:
 *
 * "A valid table entry must not be changed while it is attached
 * to any CPU and may be used for translation by that CPU except to
 * (1) invalidate the entry by using INVALIDATE PAGE TABLE ENTRY,
 * or INVALIDATE DAT TABLE ENTRY, (2) alter bits 56-63 of a page
 * table entry, or (3) make a change by means of a COMPARE AND SWAP
 * AND PURGE instruction that purges the TLB."
 *
 * The modification of a pte of an active mm struct therefore is
 * a two step process: i) invalidate the pte, ii) store the new pte.
 * This is true for the page protection bit as well.
 * The only possible optimization is to flush at the beginning of
 * a tlb_gather_mmu cycle if the mm_struct is currently not in use.
 *
 * Pages used for the page tables is a different story. FIXME: more
 */

#include <linux/mm.h>
#include <linux/swap.h>
#include <asm/processor.h>
#include <asm/pgalloc.h>
#include <asm/smp.h>
#include <asm/tlbflush.h>

#ifndef CONFIG_SMP
#define TLB_NR_PTRS	1
#else
#define TLB_NR_PTRS	508
#endif

struct mmu_gather {
	struct mm_struct *mm;
	unsigned int fullmm;
	unsigned int nr_ptes;
	unsigned int nr_pmds;
	void *array[TLB_NR_PTRS];
};

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 || (num_online_cpus() == 1) ||
		(atomic_read(&mm->mm_users) <= 1 && mm == current->active_mm);
	tlb->nr_ptes = 0;
	tlb->nr_pmds = TLB_NR_PTRS;
	if (tlb->fullmm)
		__tlb_flush_mm(mm);
	return tlb;
}

static inline void tlb_flush_mmu(struct mmu_gather *tlb,
				 unsigned long start, unsigned long end)
{
	if (!tlb->fullmm && (tlb->nr_ptes > 0 || tlb->nr_pmds < TLB_NR_PTRS))
		__tlb_flush_mm(tlb->mm);
	while (tlb->nr_ptes > 0)
		pte_free(tlb->array[--tlb->nr_ptes]);
	while (tlb->nr_pmds < TLB_NR_PTRS)
		pmd_free((pmd_t *) tlb->array[tlb->nr_pmds++]);
}

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);
}

/*
 * Release the page cache reference for a pte removed by
 * tlb_ptep_clear_flush. In both flush modes the tlb fo a page cache page
 * has already been freed, so just do free_page_and_swap_cache.
 */
static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
{
	free_page_and_swap_cache(page);
}

/*
 * pte_free_tlb frees a pte table and clears the CRSTE for the
 * page table from the tlb.
 */
static inline void pte_free_tlb(struct mmu_gather *tlb, struct page *page)
{
	if (!tlb->fullmm) {
		tlb->array[tlb->nr_ptes++] = page;
		if (tlb->nr_ptes >= tlb->nr_pmds)
			tlb_flush_mmu(tlb, 0, 0);
	} else
		pte_free(page);
}

/*
 * pmd_free_tlb frees a pmd table and clears the CRSTE for the
 * segment table entry from the tlb.
 */
static inline void pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd)
{
#ifdef __s390x__
	if (!tlb->fullmm) {
		tlb->array[--tlb->nr_pmds] = (struct page *) pmd;
		if (tlb->nr_ptes >= tlb->nr_pmds)
			tlb_flush_mmu(tlb, 0, 0);
	} else
		pmd_free(pmd);
#endif
}

#define pud_free_tlb(tlb, pud)			do { } while (0)

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

#endif /* _S390_TLB_H */