404 lines
9.8 KiB
C
404 lines
9.8 KiB
C
/* $NetBSD: vm_pager.c,v 1.16 1995/04/15 05:11:35 mycroft Exp $ */
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/*
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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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* @(#)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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/*
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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/malloc.h>
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#include <vm/vm.h>
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#include <vm/vm_page.h>
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#include <vm/vm_kern.h>
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#ifdef SWAPPAGER
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extern struct pagerops swappagerops;
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#endif
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#ifdef VNODEPAGER
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extern struct pagerops vnodepagerops;
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#endif
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#ifdef DEVPAGER
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extern struct pagerops devicepagerops;
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#endif
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struct pagerops *pagertab[] = {
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#ifdef SWAPPAGER
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&swappagerops, /* PG_SWAP */
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#else
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NULL,
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#endif
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#ifdef VNODEPAGER
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&vnodepagerops, /* PG_VNODE */
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#else
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NULL,
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#endif
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#ifdef DEVPAGER
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&devicepagerops, /* PG_DEV */
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#else
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NULL,
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#endif
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};
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int npagers = sizeof (pagertab) / sizeof (pagertab[0]);
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struct pagerops *dfltpagerops = NULL; /* default pager */
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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 (4 * 1024 * 1024)
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vm_map_t pager_map;
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boolean_t pager_map_wanted;
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vm_offset_t pager_sva, pager_eva;
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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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* Allocate a kernel submap for tracking get/put page mappings
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*/
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pager_map = kmem_suballoc(kernel_map, &pager_sva, &pager_eva,
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PAGER_MAP_SIZE, FALSE);
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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)
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(*(*pgops)->pgo_init)();
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if (dfltpagerops == NULL)
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panic("no default pager");
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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_pager_t
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vm_pager_allocate(type, handle, size, prot, off)
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int type;
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caddr_t handle;
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vm_size_t size;
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vm_prot_t prot;
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vm_offset_t off;
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{
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struct pagerops *ops;
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ops = (type == PG_DFLT) ? dfltpagerops : 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(pager)
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vm_pager_t pager;
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{
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if (pager == NULL)
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panic("vm_pager_deallocate: null pager");
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(*pager->pg_ops->pgo_dealloc)(pager);
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}
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int
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vm_pager_get_pages(pager, mlist, npages, sync)
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vm_pager_t pager;
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vm_page_t *mlist;
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int npages;
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boolean_t sync;
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{
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int rv;
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if (pager == NULL) {
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rv = VM_PAGER_OK;
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while (npages--)
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if (!vm_page_zero_fill(*mlist)) {
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rv = VM_PAGER_FAIL;
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break;
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} else
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mlist++;
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return (rv);
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}
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return ((*pager->pg_ops->pgo_getpages)(pager, mlist, npages, sync));
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}
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int
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vm_pager_put_pages(pager, mlist, npages, sync)
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vm_pager_t pager;
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vm_page_t *mlist;
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int npages;
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boolean_t sync;
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{
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if (pager == NULL)
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panic("vm_pager_put_pages: null pager");
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return ((*pager->pg_ops->pgo_putpages)(pager, mlist, npages, sync));
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}
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/* XXX compatibility*/
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int
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vm_pager_get(pager, m, sync)
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vm_pager_t pager;
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vm_page_t m;
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boolean_t sync;
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{
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return vm_pager_get_pages(pager, &m, 1, sync);
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}
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/* XXX compatibility*/
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int
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vm_pager_put(pager, m, sync)
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vm_pager_t pager;
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vm_page_t m;
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boolean_t sync;
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{
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return vm_pager_put_pages(pager, &m, 1, sync);
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}
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boolean_t
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vm_pager_has_page(pager, offset)
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vm_pager_t pager;
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vm_offset_t offset;
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{
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if (pager == NULL)
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panic("vm_pager_has_page: null pager");
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return ((*pager->pg_ops->pgo_haspage)(pager, offset));
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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)
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(*(*pgops)->pgo_putpages)(NULL, NULL, 0, FALSE);
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}
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void
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vm_pager_cluster(pager, offset, loff, hoff)
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vm_pager_t pager;
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vm_offset_t offset;
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vm_offset_t *loff;
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vm_offset_t *hoff;
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{
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if (pager == NULL)
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panic("vm_pager_cluster: null pager");
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((*pager->pg_ops->pgo_cluster)(pager, offset, loff, hoff));
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}
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void
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vm_pager_clusternull(pager, offset, loff, hoff)
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vm_pager_t pager;
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vm_offset_t offset;
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vm_offset_t *loff;
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vm_offset_t *hoff;
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{
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panic("vm_pager_nullcluster called");
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}
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vm_offset_t
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vm_pager_map_pages(mlist, npages, canwait)
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vm_page_t *mlist;
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int npages;
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boolean_t canwait;
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{
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vm_offset_t kva, va;
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vm_size_t size;
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vm_page_t m;
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/*
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* Allocate space in the pager map, if none available return 0.
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* This is basically an expansion of kmem_alloc_wait with optional
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* blocking on no space.
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*/
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size = npages * PAGE_SIZE;
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vm_map_lock(pager_map);
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while (vm_map_findspace(pager_map, 0, size, &kva)) {
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if (!canwait) {
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vm_map_unlock(pager_map);
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return (0);
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}
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pager_map_wanted = TRUE;
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vm_map_unlock(pager_map);
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(void) tsleep(pager_map, PVM, "pager_map", 0);
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vm_map_lock(pager_map);
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}
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vm_map_insert(pager_map, NULL, 0, kva, kva + size);
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vm_map_unlock(pager_map);
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for (va = kva; npages--; va += PAGE_SIZE) {
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m = *mlist++;
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#ifdef DEBUG
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if ((m->flags & PG_BUSY) == 0)
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panic("vm_pager_map_pages: page not busy");
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if (m->flags & PG_PAGEROWNED)
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panic("vm_pager_map_pages: page already in pager");
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#endif
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#ifdef DEBUG
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m->flags |= PG_PAGEROWNED;
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#endif
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pmap_enter(vm_map_pmap(pager_map), va, VM_PAGE_TO_PHYS(m),
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VM_PROT_DEFAULT, TRUE);
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}
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return (kva);
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}
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void
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vm_pager_unmap_pages(kva, npages)
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vm_offset_t kva;
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int npages;
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{
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vm_size_t size = npages * PAGE_SIZE;
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#ifdef DEBUG
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vm_offset_t va;
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vm_page_t m;
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int np = npages;
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for (va = kva; np--; va += PAGE_SIZE) {
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m = vm_pager_atop(va);
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if (m->flags & PG_PAGEROWNED)
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m->flags &= ~PG_PAGEROWNED;
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else
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printf("vm_pager_unmap_pages: %x(%x/%x) not owned\n",
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m, va, VM_PAGE_TO_PHYS(m));
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}
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#endif
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pmap_remove(vm_map_pmap(pager_map), kva, kva + size);
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vm_map_lock(pager_map);
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(void) vm_map_delete(pager_map, kva, kva + size);
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if (pager_map_wanted)
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wakeup(pager_map);
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vm_map_unlock(pager_map);
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}
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vm_page_t
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vm_pager_atop(kva)
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vm_offset_t kva;
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{
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vm_offset_t pa;
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pa = pmap_extract(vm_map_pmap(pager_map), kva);
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if (pa == 0)
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panic("vm_pager_atop");
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return (PHYS_TO_VM_PAGE(pa));
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}
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vm_pager_t
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vm_pager_lookup(pglist, handle)
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register struct pagerlst *pglist;
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caddr_t handle;
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{
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register vm_pager_t pager;
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for (pager = pglist->tqh_first; pager; pager = pager->pg_list.tqe_next)
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if (pager->pg_handle == handle)
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return (pager);
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return (NULL);
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}
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/*
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* This routine gains a reference to the object.
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* Explicit deallocation is necessary.
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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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vm_object_cache_lock();
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vm_object_lock(object);
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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_unlock(object);
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vm_object_cache_unlock();
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vm_object_deallocate(object);
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return (KERN_SUCCESS);
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}
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