uma_machdep.c revision 204128 
1/*-
2 * Copyright (c) 2003 The FreeBSD Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
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 AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/sys/powerpc/aim/uma_machdep.c 204128 2010-02-20 16:23:29Z nwhitehorn $");
29
30#include <sys/param.h>
31#include <sys/kernel.h>
32#include <sys/lock.h>
33#include <sys/mutex.h>
34#include <sys/systm.h>
35#include <sys/sysctl.h>
36#include <vm/vm.h>
37#include <vm/vm_page.h>
38#include <vm/vm_kern.h>
39#include <vm/vm_pageout.h>
40#include <vm/vm_extern.h>
41#include <vm/uma.h>
42#include <vm/uma.h>
43#include <vm/uma_int.h>
44#include <machine/md_var.h>
45#include <machine/vmparam.h>
46
47static int hw_uma_mdpages;
48SYSCTL_INT(_hw, OID_AUTO, uma_mdpages, CTLFLAG_RD, &hw_uma_mdpages, 0,
49	   "UMA MD pages in use");
50
51void *
52uma_small_alloc(uma_zone_t zone, int bytes, u_int8_t *flags, int wait)
53{
54	static vm_pindex_t color;
55	void *va;
56	vm_page_t m;
57	int pflags;
58
59	*flags = UMA_SLAB_PRIV;
60	if ((wait & (M_NOWAIT|M_USE_RESERVE)) == M_NOWAIT)
61		pflags = VM_ALLOC_INTERRUPT | VM_ALLOC_WIRED;
62	else
63		pflags = VM_ALLOC_SYSTEM | VM_ALLOC_WIRED;
64	if (wait & M_ZERO)
65		pflags |= VM_ALLOC_ZERO;
66
67	for (;;) {
68		m = vm_page_alloc(NULL, color++, pflags | VM_ALLOC_NOOBJ);
69		if (m == NULL) {
70			if (wait & M_NOWAIT)
71				return (NULL);
72			VM_WAIT;
73		} else
74			break;
75	}
76
77	va = (void *) VM_PAGE_TO_PHYS(m);
78
79	if (!hw_direct_map)
80		pmap_kenter((vm_offset_t)va, VM_PAGE_TO_PHYS(m));
81
82	if ((wait & M_ZERO) && (m->flags & PG_ZERO) == 0)
83		bzero(va, PAGE_SIZE);
84	atomic_add_int(&hw_uma_mdpages, 1);
85
86	return (va);
87}
88
89void
90uma_small_free(void *mem, int size, u_int8_t flags)
91{
92	vm_page_t m;
93
94	if (!hw_direct_map)
95		pmap_remove(kernel_pmap,(vm_offset_t)mem,
96		    (vm_offset_t)mem + PAGE_SIZE);
97
98	m = PHYS_TO_VM_PAGE((vm_offset_t)mem);
99	m->wire_count--;
100	vm_page_free(m);
101	atomic_subtract_int(&cnt.v_wire_count, 1);
102	atomic_subtract_int(&hw_uma_mdpages, 1);
103}
104