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