kernel - MPSAFE work - Finish tokenizing vm_page.c
[dragonfly.git] / sys / vm / phys_pager.c
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984263bc 1/*
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2 * (MPSAFE)
3 *
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4 * Copyright (c) 2000 Peter Wemm
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 * $FreeBSD: src/sys/vm/phys_pager.c,v 1.3.2.3 2000/12/17 02:05:41 alfred Exp $
28 */
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29#include <sys/param.h>
30#include <sys/systm.h>
31#include <sys/linker_set.h>
32#include <sys/conf.h>
33#include <sys/mman.h>
34#include <sys/sysctl.h>
35
36#include <vm/vm.h>
37#include <vm/vm_object.h>
38#include <vm/vm_page.h>
39#include <vm/vm_pager.h>
40#include <vm/vm_zone.h>
41
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42#include <sys/thread2.h>
43
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44/*
45 * No requirements.
46 */
5a648714 47vm_object_t
57f7b636 48phys_pager_alloc(void *handle, off_t size, vm_prot_t prot, off_t foff)
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49{
50 vm_object_t object;
51
52 /*
53 * Offset should be page aligned.
54 */
55 if (foff & PAGE_MASK)
56 return (NULL);
57
aecf2182 58 size = round_page64(size);
984263bc 59
d28e1355 60 KKASSERT(handle == NULL);
d28e1355 61 object = vm_object_allocate(OBJT_PHYS, OFF_TO_IDX(foff + size));
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62
63 return (object);
64}
65
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66/*
67 * No requirements.
68 */
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69static void
70phys_pager_dealloc(vm_object_t object)
71{
d28e1355 72 KKASSERT(object->handle == NULL);
8d292090 73 KKASSERT(object->swblock_count == 0);
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74}
75
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76/*
77 * No requirements.
78 */
984263bc 79static int
1b9d3514 80phys_pager_getpage(vm_object_t object, vm_page_t *mpp, int seqaccess)
984263bc 81{
1b9d3514 82 vm_page_t m = *mpp;
984263bc 83
573fb415 84 lwkt_gettoken(&vm_token);
654a39f0 85 crit_enter();
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86 if ((m->flags & PG_ZERO) == 0)
87 vm_page_zero_fill(m);
88 vm_page_flag_set(m, PG_ZERO);
89 /* Switch off pv_entries */
90 vm_page_unmanage(m);
91 m->valid = VM_PAGE_BITS_ALL;
92 m->dirty = 0;
654a39f0 93 crit_exit();
573fb415 94 lwkt_reltoken(&vm_token);
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95
96 return (VM_PAGER_OK);
97}
98
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99/*
100 * No requirements.
101 */
984263bc 102static void
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103phys_pager_putpages(vm_object_t object, vm_page_t *m, int count,
104 boolean_t sync, int *rtvals)
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105{
106
107 panic("phys_pager_putpage called");
108}
109
110/*
111 * Implement a pretty aggressive clustered getpages strategy. Hint that
112 * everything in an entire 4MB window should be prefaulted at once.
113 *
114 * XXX 4MB (1024 slots per page table page) is convenient for x86,
115 * but may not be for other arches.
116 */
117#ifndef PHYSCLUSTER
118#define PHYSCLUSTER 1024
119#endif
1b9d3514 120
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121/*
122 * No requirements.
123 */
984263bc 124static boolean_t
1b9d3514 125phys_pager_haspage(vm_object_t object, vm_pindex_t pindex)
984263bc 126{
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127 return (TRUE);
128}
129
130struct pagerops physpagerops = {
984263bc 131 phys_pager_dealloc,
1b9d3514 132 phys_pager_getpage,
984263bc 133 phys_pager_putpages,
107e9bcc 134 phys_pager_haspage
984263bc 135};