/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
22DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
23
24void 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
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
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
78no_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}