dc37578ed2
vm page allocators do. This fixes a panic when a virtio block device is mounted as root, with the host system dying in vm_page_dirty with invalid bits. Reviewed by: neel Obtained from: NetApp
136 lines
3.2 KiB
C
136 lines
3.2 KiB
C
/*-
|
|
* Copyright (c) 2011 NetApp, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* 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 NETAPP, INC ``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 NETAPP, INC 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/linker.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/sysctl.h>
|
|
|
|
#include <vm/vm.h>
|
|
#include <vm/pmap.h>
|
|
#include <vm/vm_page.h>
|
|
#include <vm/vm_pageout.h>
|
|
|
|
#include <machine/md_var.h>
|
|
#include <machine/metadata.h>
|
|
#include <machine/pc/bios.h>
|
|
#include <machine/vmparam.h>
|
|
#include <machine/pmap.h>
|
|
|
|
#include "vmm_util.h"
|
|
#include "vmm_mem.h"
|
|
|
|
SYSCTL_DECL(_hw_vmm);
|
|
|
|
static u_long pages_allocated;
|
|
SYSCTL_ULONG(_hw_vmm, OID_AUTO, pages_allocated, CTLFLAG_RD,
|
|
&pages_allocated, 0, "4KB pages allocated");
|
|
|
|
static void
|
|
update_pages_allocated(int howmany)
|
|
{
|
|
pages_allocated += howmany; /* XXX locking? */
|
|
}
|
|
|
|
int
|
|
vmm_mem_init(void)
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
|
|
vm_paddr_t
|
|
vmm_mem_alloc(size_t size)
|
|
{
|
|
int flags;
|
|
vm_page_t m;
|
|
vm_paddr_t pa;
|
|
|
|
if (size != PAGE_SIZE)
|
|
panic("vmm_mem_alloc: invalid allocation size %lu", size);
|
|
|
|
flags = VM_ALLOC_NORMAL | VM_ALLOC_NOOBJ | VM_ALLOC_WIRED |
|
|
VM_ALLOC_ZERO;
|
|
|
|
while (1) {
|
|
/*
|
|
* XXX need policy to determine when to back off the allocation
|
|
*/
|
|
m = vm_page_alloc(NULL, 0, flags);
|
|
if (m == NULL)
|
|
VM_WAIT;
|
|
else
|
|
break;
|
|
}
|
|
|
|
pa = VM_PAGE_TO_PHYS(m);
|
|
|
|
if ((m->flags & PG_ZERO) == 0)
|
|
pagezero((void *)PHYS_TO_DMAP(pa));
|
|
m->valid = VM_PAGE_BITS_ALL;
|
|
|
|
update_pages_allocated(1);
|
|
|
|
return (pa);
|
|
}
|
|
|
|
void
|
|
vmm_mem_free(vm_paddr_t base, size_t length)
|
|
{
|
|
vm_page_t m;
|
|
|
|
if (base & PAGE_MASK) {
|
|
panic("vmm_mem_free: base 0x%0lx must be aligned on a "
|
|
"0x%0x boundary\n", base, PAGE_SIZE);
|
|
}
|
|
|
|
if (length != PAGE_SIZE)
|
|
panic("vmm_mem_free: invalid length %lu", length);
|
|
|
|
m = PHYS_TO_VM_PAGE(base);
|
|
m->wire_count--;
|
|
vm_page_free(m);
|
|
atomic_subtract_int(&cnt.v_wire_count, 1);
|
|
|
|
update_pages_allocated(-1);
|
|
}
|
|
|
|
vm_paddr_t
|
|
vmm_mem_maxaddr(void)
|
|
{
|
|
|
|
return (ptoa(Maxmem));
|
|
}
|