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) = { 0, };
23
24void 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
48void 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
80no_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}
100