blob: 78357cc2a0b74e1d1242f38e5259a4452b04a129 (
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
|
/* arch/sparc64/mm/tlb.c
*
* Copyright (C) 2004 David S. Miller <davem@redhat.com>
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/percpu.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/tlbflush.h>
#include <asm/cacheflush.h>
#include <asm/mmu_context.h>
#include <asm/tlb.h>
/* Heavily inspired by the ppc64 code. */
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers) = { 0, };
void flush_tlb_pending(void)
{
struct mmu_gather *mp = &__get_cpu_var(mmu_gathers);
if (mp->tlb_nr) {
flush_tsb_user(mp);
if (CTX_VALID(mp->mm->context)) {
#ifdef CONFIG_SMP
smp_flush_tlb_pending(mp->mm, mp->tlb_nr,
&mp->vaddrs[0]);
#else
__flush_tlb_pending(CTX_HWBITS(mp->mm->context),
mp->tlb_nr, &mp->vaddrs[0]);
#endif
}
mp->tlb_nr = 0;
}
}
void tlb_batch_add(struct mm_struct *mm, unsigned long vaddr, pte_t *ptep, pte_t orig)
{
struct mmu_gather *mp = &__get_cpu_var(mmu_gathers);
unsigned long nr;
vaddr &= PAGE_MASK;
if (pte_exec(orig))
vaddr |= 0x1UL;
if (pte_dirty(orig)) {
unsigned long paddr, pfn = pte_pfn(orig);
struct address_space *mapping;
struct page *page;
if (!pfn_valid(pfn))
goto no_cache_flush;
page = pfn_to_page(pfn);
if (PageReserved(page))
goto no_cache_flush;
/* A real file page? */
mapping = page_mapping(page);
if (!mapping)
goto no_cache_flush;
paddr = (unsigned long) page_address(page);
if ((paddr ^ vaddr) & (1 << 13))
flush_dcache_page_all(mm, page);
}
no_cache_flush:
if (mp->fullmm)
return;
nr = mp->tlb_nr;
if (unlikely(nr != 0 && mm != mp->mm)) {
flush_tlb_pending();
nr = 0;
}
if (nr == 0)
mp->mm = mm;
mp->vaddrs[nr] = vaddr;
mp->tlb_nr = ++nr;
if (nr >= TLB_BATCH_NR)
flush_tlb_pending();
}
|
