433 lines
10 KiB
C
433 lines
10 KiB
C
/* $NetBSD: vm_pager.c,v 1.24 1997/01/03 18:03:39 mrg Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1991, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* 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
|
|
*
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/proc.h>
|
|
|
|
#include <vm/vm.h>
|
|
#include <vm/vm_page.h>
|
|
#include <vm/vm_kern.h>
|
|
|
|
#ifdef SWAPPAGER
|
|
extern struct pagerops swappagerops;
|
|
#endif
|
|
|
|
#ifdef VNODEPAGER
|
|
extern struct pagerops vnodepagerops;
|
|
#endif
|
|
|
|
#ifdef DEVPAGER
|
|
extern struct pagerops devicepagerops;
|
|
#endif
|
|
|
|
struct pagerops *pagertab[] = {
|
|
#ifdef SWAPPAGER
|
|
&swappagerops, /* PG_SWAP */
|
|
#else
|
|
NULL,
|
|
#endif
|
|
#ifdef VNODEPAGER
|
|
&vnodepagerops, /* PG_VNODE */
|
|
#else
|
|
NULL,
|
|
#endif
|
|
#ifdef DEVPAGER
|
|
&devicepagerops, /* PG_DEV */
|
|
#else
|
|
NULL,
|
|
#endif
|
|
};
|
|
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.
|
|
*
|
|
* 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.
|
|
*/
|
|
#define PAGER_MAP_SIZE (4 * 1024 * 1024)
|
|
|
|
vm_map_t pager_map;
|
|
boolean_t pager_map_wanted;
|
|
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++)
|
|
if (*pgops)
|
|
(*(*pgops)->pgo_init)();
|
|
if (dfltpagerops == NULL)
|
|
panic("no default pager");
|
|
}
|
|
|
|
/*
|
|
* Allocate an instance of a pager of the given type.
|
|
* Size, protection and offset parameters are passed in for pagers that
|
|
* need to perform page-level validation (e.g. the device pager).
|
|
*/
|
|
vm_pager_t
|
|
vm_pager_allocate(type, handle, size, prot, off)
|
|
int type;
|
|
caddr_t handle;
|
|
vm_size_t size;
|
|
vm_prot_t prot;
|
|
vm_offset_t off;
|
|
{
|
|
struct pagerops *ops;
|
|
|
|
ops = (type == PG_DFLT) ? dfltpagerops : pagertab[type];
|
|
if (ops)
|
|
return ((*ops->pgo_alloc)(handle, size, prot, off));
|
|
return (NULL);
|
|
}
|
|
|
|
void
|
|
vm_pager_deallocate(pager)
|
|
vm_pager_t pager;
|
|
{
|
|
if (pager == NULL)
|
|
panic("vm_pager_deallocate: null pager");
|
|
(*pager->pg_ops->pgo_dealloc)(pager);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
int
|
|
vm_pager_get_pages(pager, mlist, npages, sync)
|
|
vm_pager_t pager;
|
|
vm_page_t *mlist;
|
|
int npages;
|
|
boolean_t sync;
|
|
{
|
|
int rv;
|
|
|
|
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));
|
|
}
|
|
|
|
int
|
|
vm_pager_put_pages(pager, mlist, npages, sync)
|
|
vm_pager_t pager;
|
|
vm_page_t *mlist;
|
|
int npages;
|
|
boolean_t sync;
|
|
{
|
|
if (pager == NULL)
|
|
panic("vm_pager_put_pages: null pager");
|
|
return ((*pager->pg_ops->pgo_putpages)(pager, mlist, npages, sync));
|
|
}
|
|
|
|
/* 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);
|
|
}
|
|
|
|
boolean_t
|
|
vm_pager_has_page(pager, offset)
|
|
vm_pager_t pager;
|
|
vm_offset_t offset;
|
|
{
|
|
if (pager == NULL)
|
|
panic("vm_pager_has_page: null pager");
|
|
return ((*pager->pg_ops->pgo_haspage)(pager, offset));
|
|
}
|
|
|
|
/*
|
|
* 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++)
|
|
if (*pgops)
|
|
(*(*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));
|
|
}
|
|
|
|
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");
|
|
}
|
|
|
|
vm_offset_t
|
|
vm_pager_map_pages(mlist, npages, canwait)
|
|
vm_page_t *mlist;
|
|
int npages;
|
|
boolean_t canwait;
|
|
{
|
|
vm_offset_t kva, va;
|
|
vm_size_t size;
|
|
vm_page_t m;
|
|
|
|
/*
|
|
* 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++;
|
|
#ifdef DEBUG
|
|
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");
|
|
#endif
|
|
#ifdef DEBUG
|
|
m->flags |= PG_PAGEROWNED;
|
|
#endif
|
|
pmap_enter(vm_map_pmap(pager_map), va, VM_PAGE_TO_PHYS(m),
|
|
VM_PROT_DEFAULT, TRUE);
|
|
}
|
|
return (kva);
|
|
}
|
|
|
|
void
|
|
vm_pager_unmap_pages(kva, npages)
|
|
vm_offset_t kva;
|
|
int npages;
|
|
{
|
|
vm_size_t size = npages * PAGE_SIZE;
|
|
|
|
#ifdef DEBUG
|
|
vm_offset_t va;
|
|
vm_page_t m;
|
|
int np = npages;
|
|
|
|
for (va = kva; np--; va += PAGE_SIZE) {
|
|
m = vm_pager_atop(va);
|
|
if (m->flags & PG_PAGEROWNED)
|
|
m->flags &= ~PG_PAGEROWNED;
|
|
else
|
|
printf("vm_pager_unmap_pages: %p(%lx/%lx) not owned\n",
|
|
m, va, VM_PAGE_TO_PHYS(m));
|
|
}
|
|
#endif
|
|
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));
|
|
}
|
|
|
|
vm_pager_t
|
|
vm_pager_lookup(pglist, handle)
|
|
register struct pagerlst *pglist;
|
|
caddr_t handle;
|
|
{
|
|
register vm_pager_t pager;
|
|
|
|
for (pager = pglist->tqh_first; pager; pager = pager->pg_list.tqe_next)
|
|
if (pager->pg_handle == handle)
|
|
return (pager);
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* This routine gains a reference to the object.
|
|
* Explicit deallocation is necessary.
|
|
*/
|
|
int
|
|
pager_cache(object, should_cache)
|
|
vm_object_t object;
|
|
boolean_t should_cache;
|
|
{
|
|
if (object == NULL)
|
|
return (KERN_INVALID_ARGUMENT);
|
|
|
|
vm_object_cache_lock();
|
|
vm_object_lock(object);
|
|
if (should_cache)
|
|
object->flags |= OBJ_CANPERSIST;
|
|
else
|
|
object->flags &= ~OBJ_CANPERSIST;
|
|
vm_object_unlock(object);
|
|
vm_object_cache_unlock();
|
|
|
|
vm_object_deallocate(object);
|
|
|
|
return (KERN_SUCCESS);
|
|
}
|