cda5bd7f19
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
/*-
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* Copyright (c) 2011 NetApp, Inc.
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* All rights reserved.
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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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*
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* THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``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 NETAPP, INC 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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* $FreeBSD$
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/linker.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/kernel.h>
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#include <sys/sysctl.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <vm/vm_page.h>
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#include <vm/vm_pageout.h>
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#include <machine/md_var.h>
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#include <machine/metadata.h>
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#include <machine/pc/bios.h>
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#include <machine/vmparam.h>
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#include <machine/pmap.h>
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#include "vmm_util.h"
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#include "vmm_mem.h"
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SYSCTL_DECL(_hw_vmm);
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static u_long pages_allocated;
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SYSCTL_ULONG(_hw_vmm, OID_AUTO, pages_allocated, CTLFLAG_RD,
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&pages_allocated, 0, "4KB pages allocated");
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static void
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update_pages_allocated(int howmany)
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{
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pages_allocated += howmany; /* XXX locking? */
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}
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int
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vmm_mem_init(void)
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{
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return (0);
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}
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vm_paddr_t
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vmm_mem_alloc(size_t size)
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{
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int flags;
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vm_page_t m;
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vm_paddr_t pa;
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if (size != PAGE_SIZE)
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panic("vmm_mem_alloc: invalid allocation size %lu", size);
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flags = VM_ALLOC_NORMAL | VM_ALLOC_NOOBJ | VM_ALLOC_WIRED |
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VM_ALLOC_ZERO;
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while (1) {
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/*
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* XXX need policy to determine when to back off the allocation
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*/
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m = vm_page_alloc(NULL, 0, flags);
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if (m == NULL)
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VM_WAIT;
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else
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break;
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}
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pa = VM_PAGE_TO_PHYS(m);
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if ((m->flags & PG_ZERO) == 0)
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pagezero((void *)PHYS_TO_DMAP(pa));
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m->valid = VM_PAGE_BITS_ALL;
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update_pages_allocated(1);
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return (pa);
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}
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void
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vmm_mem_free(vm_paddr_t base, size_t length)
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{
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vm_page_t m;
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if (base & PAGE_MASK) {
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panic("vmm_mem_free: base 0x%0lx must be aligned on a "
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"0x%0x boundary\n", base, PAGE_SIZE);
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}
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if (length != PAGE_SIZE)
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panic("vmm_mem_free: invalid length %lu", length);
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m = PHYS_TO_VM_PAGE(base);
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m->wire_count--;
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vm_page_free(m);
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atomic_subtract_int(&cnt.v_wire_count, 1);
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update_pages_allocated(-1);
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}
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vm_paddr_t
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vmm_mem_maxaddr(void)
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{
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return (ptoa(Maxmem));
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}
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