366 lines
8.9 KiB
C
366 lines
8.9 KiB
C
/*
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* The Mach Operating System project at Carnegie-Mellon University.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)vm_pager.c 8.6 (Berkeley) 1/12/94
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*
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*
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* Copyright (c) 1987, 1990 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Authors: Avadis Tevanian, Jr., Michael Wayne Young
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*
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* $Id: vm_pager.c,v 1.19 1995/12/07 12:48:26 davidg Exp $
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*/
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/*
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* Paging space routine stubs. Emulates a matchmaker-like interface
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* for builtin pagers.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/malloc.h>
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#include <sys/buf.h>
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#include <sys/ucred.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/vm_prot.h>
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#include <vm/vm_object.h>
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#include <vm/vm_page.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_pager.h>
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#include <vm/vm_extern.h>
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extern struct pagerops defaultpagerops;
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extern struct pagerops swappagerops;
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extern struct pagerops vnodepagerops;
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extern struct pagerops devicepagerops;
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static struct pagerops *pagertab[] = {
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&defaultpagerops, /* OBJT_DEFAULT */
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&swappagerops, /* OBJT_SWAP */
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&vnodepagerops, /* OBJT_VNODE */
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&devicepagerops, /* OBJT_DEVICE */
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};
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static int npagers = sizeof(pagertab) / sizeof(pagertab[0]);
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/*
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* Kernel address space for mapping pages.
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* Used by pagers where KVAs are needed for IO.
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*
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* XXX needs to be large enough to support the number of pending async
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* cleaning requests (NPENDINGIO == 64) * the maximum swap cluster size
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* (MAXPHYS == 64k) if you want to get the most efficiency.
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*/
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#define PAGER_MAP_SIZE (8 * 1024 * 1024)
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int pager_map_size = PAGER_MAP_SIZE;
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vm_map_t pager_map;
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boolean_t pager_map_wanted;
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int bswneeded;
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vm_offset_t swapbkva; /* swap buffers kva */
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void
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vm_pager_init()
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{
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struct pagerops **pgops;
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/*
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* Initialize known pagers
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*/
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for (pgops = pagertab; pgops < &pagertab[npagers]; pgops++)
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if (pgops && ((*pgops)->pgo_init != NULL))
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(*(*pgops)->pgo_init) ();
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}
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void
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vm_pager_bufferinit()
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{
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struct buf *bp;
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int i;
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bp = swbuf;
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/*
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* Now set up swap and physical I/O buffer headers.
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*/
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for (i = 0; i < nswbuf - 1; i++, bp++) {
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TAILQ_INSERT_HEAD(&bswlist, bp, b_freelist);
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bp->b_rcred = bp->b_wcred = NOCRED;
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bp->b_vnbufs.le_next = NOLIST;
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}
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bp->b_rcred = bp->b_wcred = NOCRED;
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bp->b_vnbufs.le_next = NOLIST;
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bp->b_actf = NULL;
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swapbkva = kmem_alloc_pageable(pager_map, nswbuf * MAXPHYS);
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if (!swapbkva)
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panic("Not enough pager_map VM space for physical buffers");
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}
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/*
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* Allocate an instance of a pager of the given type.
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* Size, protection and offset parameters are passed in for pagers that
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* need to perform page-level validation (e.g. the device pager).
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*/
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vm_object_t
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vm_pager_allocate(type, handle, size, prot, off)
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objtype_t type;
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void *handle;
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vm_size_t size;
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vm_prot_t prot;
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vm_ooffset_t off;
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{
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struct pagerops *ops;
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ops = pagertab[type];
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if (ops)
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return ((*ops->pgo_alloc) (handle, size, prot, off));
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return (NULL);
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}
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void
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vm_pager_deallocate(object)
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vm_object_t object;
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{
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(*pagertab[object->type]->pgo_dealloc) (object);
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}
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int
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vm_pager_get_pages(object, m, count, reqpage)
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vm_object_t object;
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vm_page_t *m;
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int count;
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int reqpage;
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{
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return ((*pagertab[object->type]->pgo_getpages)(object, m, count, reqpage));
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}
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int
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vm_pager_put_pages(object, m, count, sync, rtvals)
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vm_object_t object;
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vm_page_t *m;
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int count;
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boolean_t sync;
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int *rtvals;
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{
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return ((*pagertab[object->type]->pgo_putpages)(object, m, count, sync, rtvals));
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}
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boolean_t
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vm_pager_has_page(object, offset, before, after)
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vm_object_t object;
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vm_pindex_t offset;
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int *before;
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int *after;
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{
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return ((*pagertab[object->type]->pgo_haspage) (object, offset, before, after));
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}
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/*
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* Called by pageout daemon before going back to sleep.
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* Gives pagers a chance to clean up any completed async pageing operations.
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*/
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void
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vm_pager_sync()
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{
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struct pagerops **pgops;
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for (pgops = pagertab; pgops < &pagertab[npagers]; pgops++)
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if (pgops && ((*pgops)->pgo_sync != NULL))
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(*(*pgops)->pgo_sync) ();
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}
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vm_offset_t
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vm_pager_map_page(m)
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vm_page_t m;
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{
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vm_offset_t kva;
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kva = kmem_alloc_wait(pager_map, PAGE_SIZE);
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pmap_kenter(kva, VM_PAGE_TO_PHYS(m));
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return (kva);
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}
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void
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vm_pager_unmap_page(kva)
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vm_offset_t kva;
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{
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pmap_kremove(kva);
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kmem_free_wakeup(pager_map, kva, PAGE_SIZE);
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}
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vm_object_t
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vm_pager_object_lookup(pg_list, handle)
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register struct pagerlst *pg_list;
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void *handle;
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{
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register vm_object_t object;
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for (object = pg_list->tqh_first; object != NULL; object = object->pager_object_list.tqe_next)
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if (object->handle == handle)
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return (object);
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return (NULL);
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}
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/*
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* This routine loses a reference to the object -
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* thus a reference must be gained before calling.
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*/
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int
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pager_cache(object, should_cache)
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vm_object_t object;
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boolean_t should_cache;
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{
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if (object == NULL)
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return (KERN_INVALID_ARGUMENT);
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if (should_cache)
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object->flags |= OBJ_CANPERSIST;
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else
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object->flags &= ~OBJ_CANPERSIST;
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vm_object_deallocate(object);
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return (KERN_SUCCESS);
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}
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/*
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* allocate a physical buffer
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*/
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struct buf *
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getpbuf()
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{
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int s;
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struct buf *bp;
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s = splbio();
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/* get a bp from the swap buffer header pool */
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while ((bp = bswlist.tqh_first) == NULL) {
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bswneeded = 1;
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tsleep(&bswneeded, PVM, "wswbuf", 0);
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}
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TAILQ_REMOVE(&bswlist, bp, b_freelist);
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splx(s);
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bzero(bp, sizeof *bp);
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bp->b_rcred = NOCRED;
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bp->b_wcred = NOCRED;
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bp->b_data = (caddr_t) (MAXPHYS * (bp - swbuf)) + swapbkva;
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bp->b_vnbufs.le_next = NOLIST;
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return bp;
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}
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/*
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* allocate a physical buffer, if one is available
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*/
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struct buf *
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trypbuf()
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{
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int s;
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struct buf *bp;
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s = splbio();
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if ((bp = bswlist.tqh_first) == NULL) {
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splx(s);
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return NULL;
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}
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TAILQ_REMOVE(&bswlist, bp, b_freelist);
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splx(s);
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bzero(bp, sizeof *bp);
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bp->b_rcred = NOCRED;
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bp->b_wcred = NOCRED;
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bp->b_data = (caddr_t) (MAXPHYS * (bp - swbuf)) + swapbkva;
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bp->b_vnbufs.le_next = NOLIST;
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return bp;
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}
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/*
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* release a physical buffer
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*/
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void
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relpbuf(bp)
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struct buf *bp;
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{
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int s;
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s = splbio();
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if (bp->b_rcred != NOCRED) {
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crfree(bp->b_rcred);
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bp->b_rcred = NOCRED;
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}
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if (bp->b_wcred != NOCRED) {
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crfree(bp->b_wcred);
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bp->b_wcred = NOCRED;
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}
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if (bp->b_vp)
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pbrelvp(bp);
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if (bp->b_flags & B_WANTED)
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wakeup(bp);
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TAILQ_INSERT_HEAD(&bswlist, bp, b_freelist);
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if (bswneeded) {
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bswneeded = 0;
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wakeup(&bswneeded);
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}
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splx(s);
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}
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