271 lines
6.6 KiB
C
271 lines
6.6 KiB
C
/* $NetBSD: uvm_object.c,v 1.15 2015/10/26 09:02:49 mrg Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 2006, 2010 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Mindaugas Rasiukevicius.
|
|
*
|
|
* 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
|
|
*/
|
|
|
|
/*
|
|
* uvm_object.c: operate with memory objects
|
|
*
|
|
* TODO:
|
|
* 1. Support PG_RELEASED-using objects
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__KERNEL_RCSID(0, "$NetBSD: uvm_object.c,v 1.15 2015/10/26 09:02:49 mrg Exp $");
|
|
|
|
#ifdef _KERNEL_OPT
|
|
#include "opt_ddb.h"
|
|
#endif
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/queue.h>
|
|
#include <sys/rbtree.h>
|
|
|
|
#include <uvm/uvm.h>
|
|
#include <uvm/uvm_ddb.h>
|
|
|
|
/* Page count to fetch per single step. */
|
|
#define FETCH_PAGECOUNT 16
|
|
|
|
/*
|
|
* uvm_obj_init: initialize UVM memory object.
|
|
*/
|
|
void
|
|
uvm_obj_init(struct uvm_object *uo, const struct uvm_pagerops *ops,
|
|
bool alock, u_int refs)
|
|
{
|
|
|
|
#if 0 /* notyet */
|
|
KASSERT(ops);
|
|
#endif
|
|
if (alock) {
|
|
/* Allocate and assign a lock. */
|
|
uo->vmobjlock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
|
|
} else {
|
|
/* The lock will need to be set via uvm_obj_setlock(). */
|
|
uo->vmobjlock = NULL;
|
|
}
|
|
uo->pgops = ops;
|
|
TAILQ_INIT(&uo->memq);
|
|
LIST_INIT(&uo->uo_ubc);
|
|
uo->uo_npages = 0;
|
|
uo->uo_refs = refs;
|
|
rb_tree_init(&uo->rb_tree, &uvm_page_tree_ops);
|
|
}
|
|
|
|
/*
|
|
* uvm_obj_destroy: destroy UVM memory object.
|
|
*/
|
|
void
|
|
uvm_obj_destroy(struct uvm_object *uo, bool dlock)
|
|
{
|
|
|
|
KASSERT(rb_tree_iterate(&uo->rb_tree, NULL, RB_DIR_LEFT) == NULL);
|
|
|
|
/* Purge any UBC entries associated with this object. */
|
|
ubc_purge(uo);
|
|
|
|
/* Destroy the lock, if requested. */
|
|
if (dlock) {
|
|
mutex_obj_free(uo->vmobjlock);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* uvm_obj_setlock: assign a vmobjlock to the UVM object.
|
|
*
|
|
* => Caller is responsible to ensure that UVM objects is not use.
|
|
* => Only dynamic lock may be previously set. We drop the reference then.
|
|
*/
|
|
void
|
|
uvm_obj_setlock(struct uvm_object *uo, kmutex_t *lockptr)
|
|
{
|
|
kmutex_t *olockptr = uo->vmobjlock;
|
|
|
|
if (olockptr) {
|
|
/* Drop the reference on the old lock. */
|
|
mutex_obj_free(olockptr);
|
|
}
|
|
if (lockptr == NULL) {
|
|
/* If new lock is not passed - allocate default one. */
|
|
lockptr = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
|
|
}
|
|
uo->vmobjlock = lockptr;
|
|
}
|
|
|
|
/*
|
|
* uvm_obj_wirepages: wire the pages of entire UVM object.
|
|
*
|
|
* => NOTE: this function should only be used for types of objects
|
|
* where PG_RELEASED flag is never set (aobj objects)
|
|
* => caller must pass page-aligned start and end values
|
|
*/
|
|
int
|
|
uvm_obj_wirepages(struct uvm_object *uobj, off_t start, off_t end,
|
|
struct pglist *list)
|
|
{
|
|
int i, npages, error;
|
|
struct vm_page *pgs[FETCH_PAGECOUNT], *pg = NULL;
|
|
off_t offset = start, left;
|
|
|
|
left = (end - start) >> PAGE_SHIFT;
|
|
|
|
mutex_enter(uobj->vmobjlock);
|
|
while (left) {
|
|
|
|
npages = MIN(FETCH_PAGECOUNT, left);
|
|
|
|
/* Get the pages */
|
|
memset(pgs, 0, sizeof(pgs));
|
|
error = (*uobj->pgops->pgo_get)(uobj, offset, pgs, &npages, 0,
|
|
VM_PROT_READ | VM_PROT_WRITE, UVM_ADV_SEQUENTIAL,
|
|
PGO_ALLPAGES | PGO_SYNCIO);
|
|
|
|
if (error)
|
|
goto error;
|
|
|
|
mutex_enter(uobj->vmobjlock);
|
|
for (i = 0; i < npages; i++) {
|
|
|
|
KASSERT(pgs[i] != NULL);
|
|
KASSERT(!(pgs[i]->flags & PG_RELEASED));
|
|
|
|
/*
|
|
* Loan break
|
|
*/
|
|
if (pgs[i]->loan_count) {
|
|
while (pgs[i]->loan_count) {
|
|
pg = uvm_loanbreak(pgs[i]);
|
|
if (!pg) {
|
|
mutex_exit(uobj->vmobjlock);
|
|
uvm_wait("uobjwirepg");
|
|
mutex_enter(uobj->vmobjlock);
|
|
continue;
|
|
}
|
|
}
|
|
pgs[i] = pg;
|
|
}
|
|
|
|
if (pgs[i]->pqflags & PQ_AOBJ) {
|
|
pgs[i]->flags &= ~(PG_CLEAN);
|
|
uao_dropswap(uobj, i);
|
|
}
|
|
}
|
|
|
|
/* Wire the pages */
|
|
mutex_enter(&uvm_pageqlock);
|
|
for (i = 0; i < npages; i++) {
|
|
uvm_pagewire(pgs[i]);
|
|
if (list != NULL)
|
|
TAILQ_INSERT_TAIL(list, pgs[i], pageq.queue);
|
|
}
|
|
mutex_exit(&uvm_pageqlock);
|
|
|
|
/* Unbusy the pages */
|
|
uvm_page_unbusy(pgs, npages);
|
|
|
|
left -= npages;
|
|
offset += npages << PAGE_SHIFT;
|
|
}
|
|
mutex_exit(uobj->vmobjlock);
|
|
|
|
return 0;
|
|
|
|
error:
|
|
/* Unwire the pages which has been wired */
|
|
uvm_obj_unwirepages(uobj, start, offset);
|
|
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* uvm_obj_unwirepages: unwire the pages of entire UVM object.
|
|
*
|
|
* => NOTE: this function should only be used for types of objects
|
|
* where PG_RELEASED flag is never set
|
|
* => caller must pass page-aligned start and end values
|
|
*/
|
|
void
|
|
uvm_obj_unwirepages(struct uvm_object *uobj, off_t start, off_t end)
|
|
{
|
|
struct vm_page *pg;
|
|
off_t offset;
|
|
|
|
mutex_enter(uobj->vmobjlock);
|
|
mutex_enter(&uvm_pageqlock);
|
|
for (offset = start; offset < end; offset += PAGE_SIZE) {
|
|
pg = uvm_pagelookup(uobj, offset);
|
|
|
|
KASSERT(pg != NULL);
|
|
KASSERT(!(pg->flags & PG_RELEASED));
|
|
|
|
uvm_pageunwire(pg);
|
|
}
|
|
mutex_exit(&uvm_pageqlock);
|
|
mutex_exit(uobj->vmobjlock);
|
|
}
|
|
|
|
#if defined(DDB) || defined(DEBUGPRINT)
|
|
|
|
/*
|
|
* uvm_object_printit: actually prints the object
|
|
*/
|
|
void
|
|
uvm_object_printit(struct uvm_object *uobj, bool full,
|
|
void (*pr)(const char *, ...))
|
|
{
|
|
struct vm_page *pg;
|
|
int cnt = 0;
|
|
|
|
(*pr)("OBJECT %p: locked=%d, pgops=%p, npages=%d, ",
|
|
uobj, mutex_owned(uobj->vmobjlock), uobj->pgops, uobj->uo_npages);
|
|
if (UVM_OBJ_IS_KERN_OBJECT(uobj))
|
|
(*pr)("refs=<SYSTEM>\n");
|
|
else
|
|
(*pr)("refs=%d\n", uobj->uo_refs);
|
|
|
|
if (!full) {
|
|
return;
|
|
}
|
|
(*pr)(" PAGES <pg,offset>:\n ");
|
|
TAILQ_FOREACH(pg, &uobj->memq, listq.queue) {
|
|
cnt++;
|
|
(*pr)("<%p,0x%llx> ", pg, (long long)pg->offset);
|
|
if ((cnt % 3) == 0) {
|
|
(*pr)("\n ");
|
|
}
|
|
}
|
|
if ((cnt % 3) != 0) {
|
|
(*pr)("\n");
|
|
}
|
|
}
|
|
|
|
#endif /* DDB || DEBUGPRINT */
|