NetBSD/sys/vm/vm_pager.c

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/* $NetBSD: vm_pager.c,v 1.24 1997/01/03 18:03:39 mrg Exp $ */
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/*
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* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
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*
* This code is derived from software contributed to Berkeley by
* The Mach Operating System project at Carnegie-Mellon University.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)vm_pager.c 8.6 (Berkeley) 1/12/94
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*
*
* Copyright (c) 1987, 1990 Carnegie-Mellon University.
* All rights reserved.
*
* Authors: Avadis Tevanian, Jr., Michael Wayne Young
*
* Permission to use, copy, modify and distribute this software and
* its documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/
/*
* Paging space routine stubs. Emulates a matchmaker-like interface
* for builtin pagers.
*/
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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 <sys/proc.h>
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#include <vm/vm.h>
#include <vm/vm_page.h>
#include <vm/vm_kern.h>
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#ifdef SWAPPAGER
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extern struct pagerops swappagerops;
#endif
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#ifdef VNODEPAGER
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extern struct pagerops vnodepagerops;
#endif
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#ifdef DEVPAGER
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extern struct pagerops devicepagerops;
#endif
struct pagerops *pagertab[] = {
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#ifdef SWAPPAGER
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&swappagerops, /* PG_SWAP */
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#else
NULL,
#endif
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#ifdef VNODEPAGER
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&vnodepagerops, /* PG_VNODE */
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#else
NULL,
#endif
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#ifdef DEVPAGER
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&devicepagerops, /* PG_DEV */
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#else
NULL,
#endif
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};
int npagers = sizeof (pagertab) / sizeof (pagertab[0]);
struct pagerops *dfltpagerops = NULL; /* default pager */
/*
* Kernel address space for mapping pages.
* Used by pagers where KVAs are needed for IO.
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*
* XXX needs to be large enough to support the number of pending async
* cleaning requests (NPENDINGIO == 64) * the maximum swap cluster size
* (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;
void
vm_pager_init()
{
struct pagerops **pgops;
/*
* Allocate a kernel submap for tracking get/put page mappings
*/
pager_map = kmem_suballoc(kernel_map, &pager_sva, &pager_eva,
PAGER_MAP_SIZE, FALSE);
/*
* Initialize known pagers
*/
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)
panic("no default pager");
}
/*
* 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
* need to perform page-level validation (e.g. the device pager).
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*/
vm_pager_t
vm_pager_allocate(type, handle, size, prot, off)
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int type;
caddr_t handle;
vm_size_t size;
vm_prot_t prot;
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vm_offset_t off;
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{
struct pagerops *ops;
ops = (type == PG_DFLT) ? dfltpagerops : pagertab[type];
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if (ops)
return ((*ops->pgo_alloc)(handle, size, prot, off));
return (NULL);
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}
void
vm_pager_deallocate(pager)
vm_pager_t pager;
{
if (pager == NULL)
panic("vm_pager_deallocate: null pager");
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(*pager->pg_ops->pgo_dealloc)(pager);
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}
int
vm_pager_remove(pager, from, to)
vm_pager_t pager;
vm_offset_t from, to;
{
if (pager == NULL)
panic("vm_pager_remove: null pager");
return (*pager->pg_ops->pgo_remove)(pager, from, to);
}
vm_offset_t
vm_pager_next(pager, offset)
vm_pager_t pager;
vm_offset_t offset;
{
if (pager == NULL)
panic("vm_pager_next: null pager");
return (*pager->pg_ops->pgo_next)(pager, offset);
}
int
vm_pager_count(pager)
vm_pager_t pager;
{
if (pager == NULL)
panic("vm_pager_count: null pager");
return (*pager->pg_ops->pgo_count)(pager);
}
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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;
int npages;
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boolean_t sync;
{
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int rv;
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if (pager == NULL) {
rv = VM_PAGER_OK;
while (npages--)
if (!vm_page_zero_fill(*mlist)) {
rv = VM_PAGER_FAIL;
break;
} else
mlist++;
return (rv);
}
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;
int npages;
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boolean_t sync;
{
if (pager == NULL)
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panic("vm_pager_put_pages: null pager");
return ((*pager->pg_ops->pgo_putpages)(pager, mlist, npages, sync));
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}
/* XXX compatibility*/
int
vm_pager_get(pager, m, sync)
vm_pager_t pager;
vm_page_t m;
boolean_t sync;
{
return vm_pager_get_pages(pager, &m, 1, sync);
}
/* XXX compatibility*/
int
vm_pager_put(pager, m, sync)
vm_pager_t pager;
vm_page_t m;
boolean_t sync;
{
return vm_pager_put_pages(pager, &m, 1, sync);
}
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boolean_t
vm_pager_has_page(pager, offset)
vm_pager_t pager;
vm_offset_t offset;
{
if (pager == NULL)
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panic("vm_pager_has_page: null pager");
return ((*pager->pg_ops->pgo_haspage)(pager, offset));
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}
/*
* Called by pageout daemon before going back to sleep.
* Gives pagers a chance to clean up any completed async pageing operations.
*/
void
vm_pager_sync()
{
struct pagerops **pgops;
for (pgops = pagertab; pgops < &pagertab[npagers]; pgops++)
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if (*pgops)
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(*(*pgops)->pgo_putpages)(NULL, NULL, 0, FALSE);
}
void
vm_pager_cluster(pager, offset, loff, hoff)
vm_pager_t pager;
vm_offset_t offset;
vm_offset_t *loff;
vm_offset_t *hoff;
{
if (pager == NULL)
panic("vm_pager_cluster: null pager");
((*pager->pg_ops->pgo_cluster)(pager, offset, loff, hoff));
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}
void
vm_pager_clusternull(pager, offset, loff, hoff)
vm_pager_t pager;
vm_offset_t offset;
vm_offset_t *loff;
vm_offset_t *hoff;
{
panic("vm_pager_nullcluster called");
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}
vm_offset_t
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vm_pager_map_pages(mlist, npages, canwait)
vm_page_t *mlist;
int npages;
boolean_t canwait;
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{
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vm_offset_t kva, va;
vm_size_t size;
vm_page_t m;
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/*
* Allocate space in the pager map, if none available return 0.
* This is basically an expansion of kmem_alloc_wait with optional
* blocking on no space.
*/
size = npages * PAGE_SIZE;
vm_map_lock(pager_map);
while (vm_map_findspace(pager_map, 0, size, &kva)) {
if (!canwait) {
vm_map_unlock(pager_map);
return (0);
}
pager_map_wanted = TRUE;
vm_map_unlock(pager_map);
(void) tsleep(pager_map, PVM, "pager_map", 0);
vm_map_lock(pager_map);
}
vm_map_insert(pager_map, NULL, 0, kva, kva + size);
vm_map_unlock(pager_map);
for (va = kva; npages--; va += PAGE_SIZE) {
m = *mlist++;
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#ifdef DEBUG
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if ((m->flags & PG_BUSY) == 0)
panic("vm_pager_map_pages: page not busy");
if (m->flags & PG_PAGEROWNED)
panic("vm_pager_map_pages: page already in pager");
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#endif
#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),
VM_PROT_DEFAULT, TRUE);
}
return (kva);
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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) {
m = vm_pager_atop(va);
if (m->flags & PG_PAGEROWNED)
m->flags &= ~PG_PAGEROWNED;
else
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printf("vm_pager_unmap_pages: %p(%lx/%lx) 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);
vm_map_lock(pager_map);
(void) vm_map_delete(pager_map, kva, kva + size);
if (pager_map_wanted)
wakeup(pager_map);
vm_map_unlock(pager_map);
}
vm_page_t
vm_pager_atop(kva)
vm_offset_t kva;
{
vm_offset_t pa;
pa = pmap_extract(vm_map_pmap(pager_map), kva);
if (pa == 0)
panic("vm_pager_atop");
return (PHYS_TO_VM_PAGE(pa));
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}
vm_pager_t
vm_pager_lookup(pglist, handle)
register struct pagerlst *pglist;
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caddr_t handle;
{
register vm_pager_t pager;
for (pager = pglist->tqh_first; pager; pager = pager->pg_list.tqe_next)
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if (pager->pg_handle == handle)
return (pager);
return (NULL);
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}
/*
* This routine gains a reference to the object.
* Explicit deallocation is necessary.
*/
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int
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pager_cache(object, should_cache)
vm_object_t object;
boolean_t should_cache;
{
if (object == NULL)
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return (KERN_INVALID_ARGUMENT);
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vm_object_cache_lock();
vm_object_lock(object);
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if (should_cache)
object->flags |= OBJ_CANPERSIST;
else
object->flags &= ~OBJ_CANPERSIST;
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vm_object_unlock(object);
vm_object_cache_unlock();
vm_object_deallocate(object);
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return (KERN_SUCCESS);
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}