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[linux-2.6.git] / arch / sparc64 / 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) = { 0, };
23
24 void flush_tlb_pending(void)
25 {
26         struct mmu_gather *mp = &__get_cpu_var(mmu_gathers);
27
28         preempt_disable();
29
30         if (mp->tlb_nr) {
31                 flush_tsb_user(mp);
32
33                 if (CTX_VALID(mp->mm->context)) {
34 #ifdef CONFIG_SMP
35                         smp_flush_tlb_pending(mp->mm, mp->tlb_nr,
36                                               &mp->vaddrs[0]);
37 #else
38                         __flush_tlb_pending(CTX_HWBITS(mp->mm->context),
39                                             mp->tlb_nr, &mp->vaddrs[0]);
40 #endif
41                 }
42                 mp->tlb_nr = 0;
43         }
44
45         preempt_enable();
46 }
47
48 void tlb_batch_add(struct mm_struct *mm, unsigned long vaddr, pte_t *ptep, pte_t orig)
49 {
50         struct mmu_gather *mp = &__get_cpu_var(mmu_gathers);
51         unsigned long nr;
52
53         vaddr &= PAGE_MASK;
54         if (pte_exec(orig))
55                 vaddr |= 0x1UL;
56
57         if (tlb_type != hypervisor &&
58             pte_dirty(orig)) {
59                 unsigned long paddr, pfn = pte_pfn(orig);
60                 struct address_space *mapping;
61                 struct page *page;
62
63                 if (!pfn_valid(pfn))
64                         goto no_cache_flush;
65
66                 page = pfn_to_page(pfn);
67                 if (PageReserved(page))
68                         goto no_cache_flush;
69
70                 /* A real file page? */
71                 mapping = page_mapping(page);
72                 if (!mapping)
73                         goto no_cache_flush;
74
75                 paddr = (unsigned long) page_address(page);
76                 if ((paddr ^ vaddr) & (1 << 13))
77                         flush_dcache_page_all(mm, page);
78         }
79
80 no_cache_flush:
81
82         if (mp->fullmm)
83                 return;
84
85         nr = mp->tlb_nr;
86
87         if (unlikely(nr != 0 && mm != mp->mm)) {
88                 flush_tlb_pending();
89                 nr = 0;
90         }
91
92         if (nr == 0)
93                 mp->mm = mm;
94
95         mp->vaddrs[nr] = vaddr;
96         mp->tlb_nr = ++nr;
97         if (nr >= TLB_BATCH_NR)
98                 flush_tlb_pending();
99 }