blob: d8f21e24a82f8c98f0a708bd1a493058a51b49bb [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* 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>
David S. Millerc9f29462006-04-30 22:54:27 -070011#include <linux/preempt.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070012
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
David S. Millera9e7bb02008-09-12 00:06:58 -070022DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
24void flush_tlb_pending(void)
25{
David S. Miller76cc86e2008-03-27 16:51:44 -070026 struct mmu_gather *mp = &get_cpu_var(mmu_gathers);
Linus Torvalds1da177e2005-04-16 15:20:36 -070027
28 if (mp->tlb_nr) {
David S. Miller74bf4312006-01-31 18:29:18 -080029 flush_tsb_user(mp);
30
Linus Torvalds1da177e2005-04-16 15:20:36 -070031 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 }
David S. Millerc9f29462006-04-30 22:54:27 -070042
David S. Miller76cc86e2008-03-27 16:51:44 -070043 put_cpu_var(mmu_gathers);
Linus Torvalds1da177e2005-04-16 15:20:36 -070044}
45
46void 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
David S. Miller7a591cf2006-02-26 19:44:50 -080055 if (tlb_type != hypervisor &&
56 pte_dirty(orig)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 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
78no_cache_flush:
79
Hugh Dickins4d6ddfa2005-10-29 18:16:02 -070080 if (mp->fullmm)
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 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}