sparc: unify sections.h
[linux-2.6.git] / arch / sparc / mm / tlb.c
1 /* arch/sparc64/mm/tlb.c
2  *
3  * Copyright (C) 2004 David S. Miller <davem@redhat.com>
4  */
5
6 #include <linux/kernel.h>
7 #include <linux/init.h>
8 #include <linux/percpu.h>
9 #include <linux/mm.h>
10 #include <linux/swap.h>
11 #include <linux/preempt.h>
12
13 #include <asm/pgtable.h>
14 #include <asm/pgalloc.h>
15 #include <asm/tlbflush.h>
16 #include <asm/cacheflush.h>
17 #include <asm/mmu_context.h>
18 #include <asm/tlb.h>
19
20 /* Heavily inspired by the ppc64 code.  */
21
22 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
23
24 void flush_tlb_pending(void)
25 {
26         struct mmu_gather *mp = &get_cpu_var(mmu_gathers);
27
28         if (mp->tlb_nr) {
29                 flush_tsb_user(mp);
30
31                 if (CTX_VALID(mp->mm->context)) {
32 #ifdef CONFIG_SMP
33                         smp_flush_tlb_pending(mp->mm, mp->tlb_nr,
34                                               &mp->vaddrs[0]);
35 #else
36                         __flush_tlb_pending(CTX_HWBITS(mp->mm->context),
37                                             mp->tlb_nr, &mp->vaddrs[0]);
38 #endif
39                 }
40                 mp->tlb_nr = 0;
41         }
42
43         put_cpu_var(mmu_gathers);
44 }
45
46 void tlb_batch_add(struct mm_struct *mm, unsigned long vaddr, pte_t *ptep, pte_t orig)
47 {
48         struct mmu_gather *mp = &__get_cpu_var(mmu_gathers);
49         unsigned long nr;
50
51         vaddr &= PAGE_MASK;
52         if (pte_exec(orig))
53                 vaddr |= 0x1UL;
54
55         if (tlb_type != hypervisor &&
56             pte_dirty(orig)) {
57                 unsigned long paddr, pfn = pte_pfn(orig);
58                 struct address_space *mapping;
59                 struct page *page;
60
61                 if (!pfn_valid(pfn))
62                         goto no_cache_flush;
63
64                 page = pfn_to_page(pfn);
65                 if (PageReserved(page))
66                         goto no_cache_flush;
67
68                 /* A real file page? */
69                 mapping = page_mapping(page);
70                 if (!mapping)
71                         goto no_cache_flush;
72
73                 paddr = (unsigned long) page_address(page);
74                 if ((paddr ^ vaddr) & (1 << 13))
75                         flush_dcache_page_all(mm, page);
76         }
77
78 no_cache_flush:
79
80         if (mp->fullmm)
81                 return;
82
83         nr = mp->tlb_nr;
84
85         if (unlikely(nr != 0 && mm != mp->mm)) {
86                 flush_tlb_pending();
87                 nr = 0;
88         }
89
90         if (nr == 0)
91                 mp->mm = mm;
92
93         mp->vaddrs[nr] = vaddr;
94         mp->tlb_nr = ++nr;
95         if (nr >= TLB_BATCH_NR)
96                 flush_tlb_pending();
97 }