302 lines
8.8 KiB
C
302 lines
8.8 KiB
C
/*
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* Copyright (c) 1991 Regents of the University of California.
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* 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_page.c 7.4 (Berkeley) 5/7/91
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* $FreeBSD$
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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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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/vmmeter.h>
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#include <sys/vnode.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_kern.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.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_pageout.h>
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#include <vm/vm_pager.h>
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#include <vm/vm_extern.h>
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static int
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vm_contig_launder(int queue)
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{
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vm_object_t object;
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vm_page_t m, m_tmp, next;
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for (m = TAILQ_FIRST(&vm_page_queues[queue].pl); m != NULL; m = next) {
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next = TAILQ_NEXT(m, pageq);
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KASSERT(m->queue == queue,
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("vm_contig_launder: page %p's queue is not %d", m, queue));
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if (vm_page_sleep_if_busy(m, TRUE, "vpctw0")) {
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vm_page_lock_queues();
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return (TRUE);
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}
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vm_page_test_dirty(m);
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if (m->dirty) {
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object = m->object;
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if (object->type == OBJT_VNODE) {
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vm_page_unlock_queues();
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vn_lock(object->handle,
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LK_EXCLUSIVE | LK_RETRY, curthread);
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vm_object_page_clean(object, 0, 0, OBJPC_SYNC);
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VOP_UNLOCK(object->handle, 0, curthread);
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vm_page_lock_queues();
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return (TRUE);
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} else if (object->type == OBJT_SWAP ||
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object->type == OBJT_DEFAULT) {
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m_tmp = m;
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vm_pageout_flush(&m_tmp, 1, 0);
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return (TRUE);
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}
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} else if (m->busy == 0 && m->hold_count == 0)
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vm_page_cache(m);
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}
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return (FALSE);
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}
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/*
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* This interface is for merging with malloc() someday.
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* Even if we never implement compaction so that contiguous allocation
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* works after initialization time, malloc()'s data structures are good
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* for statistics and for allocations of less than a page.
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*/
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static void *
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contigmalloc1(
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unsigned long size, /* should be size_t here and for malloc() */
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struct malloc_type *type,
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int flags,
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unsigned long low,
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unsigned long high,
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unsigned long alignment,
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unsigned long boundary,
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vm_map_t map)
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{
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int i, s, start;
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vm_offset_t addr, phys, tmp_addr;
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int pass;
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vm_page_t pga = vm_page_array;
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size = round_page(size);
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if (size == 0)
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panic("contigmalloc1: size must not be 0");
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if ((alignment & (alignment - 1)) != 0)
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panic("contigmalloc1: alignment must be a power of 2");
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if ((boundary & (boundary - 1)) != 0)
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panic("contigmalloc1: boundary must be a power of 2");
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start = 0;
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for (pass = 0; pass <= 1; pass++) {
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s = splvm();
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vm_page_lock_queues();
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again:
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/*
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* Find first page in array that is free, within range, aligned, and
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* such that the boundary won't be crossed.
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*/
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for (i = start; i < cnt.v_page_count; i++) {
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int pqtype;
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phys = VM_PAGE_TO_PHYS(&pga[i]);
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pqtype = pga[i].queue - pga[i].pc;
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if (((pqtype == PQ_FREE) || (pqtype == PQ_CACHE)) &&
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(phys >= low) && (phys < high) &&
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((phys & (alignment - 1)) == 0) &&
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(((phys ^ (phys + size - 1)) & ~(boundary - 1)) == 0))
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break;
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}
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/*
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* If the above failed or we will exceed the upper bound, fail.
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*/
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if ((i == cnt.v_page_count) ||
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((VM_PAGE_TO_PHYS(&pga[i]) + size) > high)) {
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again1:
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if (vm_contig_launder(PQ_INACTIVE))
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goto again1;
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if (vm_contig_launder(PQ_ACTIVE))
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goto again1;
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vm_page_unlock_queues();
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splx(s);
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continue;
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}
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start = i;
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/*
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* Check successive pages for contiguous and free.
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*/
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for (i = start + 1; i < (start + size / PAGE_SIZE); i++) {
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int pqtype;
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pqtype = pga[i].queue - pga[i].pc;
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if ((VM_PAGE_TO_PHYS(&pga[i]) !=
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(VM_PAGE_TO_PHYS(&pga[i - 1]) + PAGE_SIZE)) ||
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((pqtype != PQ_FREE) && (pqtype != PQ_CACHE))) {
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start++;
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goto again;
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}
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}
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for (i = start; i < (start + size / PAGE_SIZE); i++) {
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vm_page_t m = &pga[i];
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if ((m->queue - m->pc) == PQ_CACHE) {
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vm_page_busy(m);
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vm_page_free(m);
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}
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mtx_lock_spin(&vm_page_queue_free_mtx);
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vm_pageq_remove_nowakeup(m);
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m->valid = VM_PAGE_BITS_ALL;
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if (m->flags & PG_ZERO)
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vm_page_zero_count--;
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m->flags = 0;
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KASSERT(m->dirty == 0, ("contigmalloc1: page %p was dirty", m));
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m->wire_count = 0;
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m->busy = 0;
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m->object = NULL;
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mtx_unlock_spin(&vm_page_queue_free_mtx);
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}
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vm_page_unlock_queues();
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/*
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* We've found a contiguous chunk that meets are requirements.
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* Allocate kernel VM, unfree and assign the physical pages to it and
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* return kernel VM pointer.
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*/
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vm_map_lock(map);
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if (vm_map_findspace(map, vm_map_min(map), size, &addr) !=
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KERN_SUCCESS) {
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/*
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* XXX We almost never run out of kernel virtual
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* space, so we don't make the allocated memory
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* above available.
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*/
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vm_map_unlock(map);
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splx(s);
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return (NULL);
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}
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vm_object_reference(kernel_object);
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vm_map_insert(map, kernel_object, addr - VM_MIN_KERNEL_ADDRESS,
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addr, addr + size, VM_PROT_ALL, VM_PROT_ALL, 0);
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vm_map_unlock(map);
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tmp_addr = addr;
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for (i = start; i < (start + size / PAGE_SIZE); i++) {
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vm_page_t m = &pga[i];
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vm_page_insert(m, kernel_object,
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OFF_TO_IDX(tmp_addr - VM_MIN_KERNEL_ADDRESS));
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tmp_addr += PAGE_SIZE;
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}
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vm_map_wire(map, addr, addr + size, FALSE);
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splx(s);
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return ((void *)addr);
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}
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return NULL;
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}
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void *
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contigmalloc(
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unsigned long size, /* should be size_t here and for malloc() */
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struct malloc_type *type,
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int flags,
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unsigned long low,
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unsigned long high,
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unsigned long alignment,
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unsigned long boundary)
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{
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void * ret;
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GIANT_REQUIRED;
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ret = contigmalloc1(size, type, flags, low, high, alignment, boundary,
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kernel_map);
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return (ret);
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}
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void
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contigfree(void *addr, unsigned long size, struct malloc_type *type)
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{
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GIANT_REQUIRED;
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kmem_free(kernel_map, (vm_offset_t)addr, size);
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}
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vm_offset_t
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vm_page_alloc_contig(
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vm_offset_t size,
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vm_offset_t low,
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vm_offset_t high,
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vm_offset_t alignment)
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{
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vm_offset_t ret;
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GIANT_REQUIRED;
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ret = ((vm_offset_t)contigmalloc1(size, M_DEVBUF, M_NOWAIT, low, high,
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alignment, 0ul, kernel_map));
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return (ret);
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}
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