5438 lines
137 KiB
C
5438 lines
137 KiB
C
/* $NetBSD: uvm_map.c,v 1.411 2024/02/09 22:08:38 andvar Exp $ */
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/*
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* Copyright (c) 1997 Charles D. Cranor and Washington University.
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* Copyright (c) 1991, 1993, The Regents of the University of California.
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*
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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. 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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* @(#)vm_map.c 8.3 (Berkeley) 1/12/94
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* from: Id: uvm_map.c,v 1.1.2.27 1998/02/07 01:16:54 chs Exp
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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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* 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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/*
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* uvm_map.c: uvm map operations
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: uvm_map.c,v 1.411 2024/02/09 22:08:38 andvar Exp $");
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#include "opt_ddb.h"
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#include "opt_pax.h"
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#include "opt_uvmhist.h"
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#include "opt_uvm.h"
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#include "opt_sysv.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mman.h>
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#include <sys/proc.h>
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#include <sys/pool.h>
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#include <sys/kernel.h>
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#include <sys/mount.h>
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#include <sys/pax.h>
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#include <sys/vnode.h>
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#include <sys/filedesc.h>
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#include <sys/lockdebug.h>
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#include <sys/atomic.h>
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#include <sys/sysctl.h>
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#ifndef __USER_VA0_IS_SAFE
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#include <sys/kauth.h>
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#include "opt_user_va0_disable_default.h"
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#endif
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#include <sys/shm.h>
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#include <uvm/uvm.h>
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#include <uvm/uvm_readahead.h>
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#if defined(DDB) || defined(DEBUGPRINT)
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#include <uvm/uvm_ddb.h>
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#endif
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#ifdef UVMHIST
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#ifndef UVMHIST_MAPHIST_SIZE
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#define UVMHIST_MAPHIST_SIZE 100
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#endif
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static struct kern_history_ent maphistbuf[UVMHIST_MAPHIST_SIZE];
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UVMHIST_DEFINE(maphist) = UVMHIST_INITIALIZER(maphist, maphistbuf);
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#endif
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#if !defined(UVMMAP_COUNTERS)
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#define UVMMAP_EVCNT_DEFINE(name) /* nothing */
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#define UVMMAP_EVCNT_INCR(ev) /* nothing */
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#define UVMMAP_EVCNT_DECR(ev) /* nothing */
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#else /* defined(UVMMAP_NOCOUNTERS) */
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#include <sys/evcnt.h>
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#define UVMMAP_EVCNT_DEFINE(name) \
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struct evcnt uvmmap_evcnt_##name = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, NULL, \
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"uvmmap", #name); \
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EVCNT_ATTACH_STATIC(uvmmap_evcnt_##name);
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#define UVMMAP_EVCNT_INCR(ev) uvmmap_evcnt_##ev.ev_count++
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#define UVMMAP_EVCNT_DECR(ev) uvmmap_evcnt_##ev.ev_count--
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#endif /* defined(UVMMAP_NOCOUNTERS) */
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UVMMAP_EVCNT_DEFINE(ubackmerge)
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UVMMAP_EVCNT_DEFINE(uforwmerge)
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UVMMAP_EVCNT_DEFINE(ubimerge)
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UVMMAP_EVCNT_DEFINE(unomerge)
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UVMMAP_EVCNT_DEFINE(kbackmerge)
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UVMMAP_EVCNT_DEFINE(kforwmerge)
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UVMMAP_EVCNT_DEFINE(kbimerge)
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UVMMAP_EVCNT_DEFINE(knomerge)
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UVMMAP_EVCNT_DEFINE(map_call)
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UVMMAP_EVCNT_DEFINE(mlk_call)
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UVMMAP_EVCNT_DEFINE(mlk_hint)
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UVMMAP_EVCNT_DEFINE(mlk_tree)
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UVMMAP_EVCNT_DEFINE(mlk_treeloop)
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const char vmmapbsy[] = "vmmapbsy";
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/*
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* cache for dynamically-allocated map entries.
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*/
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static struct pool_cache uvm_map_entry_cache;
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#ifdef PMAP_GROWKERNEL
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/*
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* This global represents the end of the kernel virtual address
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* space. If we want to exceed this, we must grow the kernel
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* virtual address space dynamically.
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*
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* Note, this variable is locked by kernel_map's lock.
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*/
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vaddr_t uvm_maxkaddr;
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#endif
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#ifndef __USER_VA0_IS_SAFE
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#ifndef __USER_VA0_DISABLE_DEFAULT
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#define __USER_VA0_DISABLE_DEFAULT 1
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#endif
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#ifdef USER_VA0_DISABLE_DEFAULT /* kernel config option overrides */
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#undef __USER_VA0_DISABLE_DEFAULT
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#define __USER_VA0_DISABLE_DEFAULT USER_VA0_DISABLE_DEFAULT
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#endif
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int user_va0_disable = __USER_VA0_DISABLE_DEFAULT;
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#endif
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/*
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* macros
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*/
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/*
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* uvm_map_align_va: round down or up virtual address
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*/
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static __inline void
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uvm_map_align_va(vaddr_t *vap, vsize_t align, int topdown)
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{
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KASSERT(powerof2(align));
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if (align != 0 && (*vap & (align - 1)) != 0) {
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if (topdown)
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*vap = rounddown2(*vap, align);
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else
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*vap = roundup2(*vap, align);
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}
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}
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/*
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* UVM_ET_ISCOMPATIBLE: check some requirements for map entry merging
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*/
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extern struct vm_map *pager_map;
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#define UVM_ET_ISCOMPATIBLE(ent, type, uobj, meflags, \
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prot, maxprot, inh, adv, wire) \
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((ent)->etype == (type) && \
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(((ent)->flags ^ (meflags)) & (UVM_MAP_NOMERGE)) == 0 && \
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(ent)->object.uvm_obj == (uobj) && \
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(ent)->protection == (prot) && \
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(ent)->max_protection == (maxprot) && \
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(ent)->inheritance == (inh) && \
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(ent)->advice == (adv) && \
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(ent)->wired_count == (wire))
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/*
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* uvm_map_entry_link: insert entry into a map
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*
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* => map must be locked
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*/
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#define uvm_map_entry_link(map, after_where, entry) do { \
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uvm_mapent_check(entry); \
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(map)->nentries++; \
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(entry)->prev = (after_where); \
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(entry)->next = (after_where)->next; \
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(entry)->prev->next = (entry); \
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(entry)->next->prev = (entry); \
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uvm_rb_insert((map), (entry)); \
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} while (/*CONSTCOND*/ 0)
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/*
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* uvm_map_entry_unlink: remove entry from a map
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*
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* => map must be locked
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*/
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#define uvm_map_entry_unlink(map, entry) do { \
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KASSERT((entry) != (map)->first_free); \
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KASSERT((entry) != (map)->hint); \
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uvm_mapent_check(entry); \
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(map)->nentries--; \
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(entry)->next->prev = (entry)->prev; \
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(entry)->prev->next = (entry)->next; \
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uvm_rb_remove((map), (entry)); \
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} while (/*CONSTCOND*/ 0)
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/*
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* SAVE_HINT: saves the specified entry as the hint for future lookups.
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*
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* => map need not be locked.
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*/
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#define SAVE_HINT(map, check, value) do { \
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if ((map)->hint == (check)) \
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(map)->hint = (value); \
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} while (/*CONSTCOND*/ 0)
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/*
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* clear_hints: ensure that hints don't point to the entry.
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*
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* => map must be write-locked.
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*/
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static void
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clear_hints(struct vm_map *map, struct vm_map_entry *ent)
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{
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SAVE_HINT(map, ent, ent->prev);
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if (map->first_free == ent) {
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map->first_free = ent->prev;
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}
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}
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/*
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* VM_MAP_RANGE_CHECK: check and correct range
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*
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* => map must at least be read locked
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*/
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#define VM_MAP_RANGE_CHECK(map, start, end) do { \
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if (start < vm_map_min(map)) \
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start = vm_map_min(map); \
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if (end > vm_map_max(map)) \
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end = vm_map_max(map); \
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if (start > end) \
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start = end; \
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} while (/*CONSTCOND*/ 0)
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/*
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* local prototypes
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*/
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static struct vm_map_entry *
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uvm_mapent_alloc(struct vm_map *, int);
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static void uvm_mapent_copy(struct vm_map_entry *, struct vm_map_entry *);
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static void uvm_mapent_free(struct vm_map_entry *);
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#if defined(DEBUG)
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static void _uvm_mapent_check(const struct vm_map_entry *, int);
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#define uvm_mapent_check(map) _uvm_mapent_check(map, __LINE__)
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#else /* defined(DEBUG) */
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#define uvm_mapent_check(e) /* nothing */
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#endif /* defined(DEBUG) */
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static void uvm_map_entry_unwire(struct vm_map *, struct vm_map_entry *);
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static void uvm_map_reference_amap(struct vm_map_entry *, int);
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static int uvm_map_space_avail(vaddr_t *, vsize_t, voff_t, vsize_t, int,
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int, struct vm_map_entry *);
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static void uvm_map_unreference_amap(struct vm_map_entry *, int);
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int _uvm_map_sanity(struct vm_map *);
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int _uvm_tree_sanity(struct vm_map *);
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static vsize_t uvm_rb_maxgap(const struct vm_map_entry *);
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#define ROOT_ENTRY(map) ((struct vm_map_entry *)(map)->rb_tree.rbt_root)
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#define LEFT_ENTRY(entry) ((struct vm_map_entry *)(entry)->rb_node.rb_left)
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#define RIGHT_ENTRY(entry) ((struct vm_map_entry *)(entry)->rb_node.rb_right)
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#define PARENT_ENTRY(map, entry) \
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(ROOT_ENTRY(map) == (entry) \
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? NULL : (struct vm_map_entry *)RB_FATHER(&(entry)->rb_node))
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/*
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* These get filled in if/when SYSVSHM shared memory code is loaded
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*
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* We do this with function pointers rather the #ifdef SYSVSHM so the
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* SYSVSHM code can be loaded and unloaded
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*/
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void (*uvm_shmexit)(struct vmspace *) = NULL;
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void (*uvm_shmfork)(struct vmspace *, struct vmspace *) = NULL;
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static int
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uvm_map_compare_nodes(void *ctx, const void *nparent, const void *nkey)
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{
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const struct vm_map_entry *eparent = nparent;
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const struct vm_map_entry *ekey = nkey;
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KASSERT(eparent->start < ekey->start || eparent->start >= ekey->end);
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KASSERT(ekey->start < eparent->start || ekey->start >= eparent->end);
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if (eparent->start < ekey->start)
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return -1;
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if (eparent->end >= ekey->start)
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return 1;
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return 0;
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}
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static int
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uvm_map_compare_key(void *ctx, const void *nparent, const void *vkey)
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{
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const struct vm_map_entry *eparent = nparent;
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const vaddr_t va = *(const vaddr_t *) vkey;
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if (eparent->start < va)
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return -1;
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if (eparent->end >= va)
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return 1;
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return 0;
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}
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static const rb_tree_ops_t uvm_map_tree_ops = {
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.rbto_compare_nodes = uvm_map_compare_nodes,
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.rbto_compare_key = uvm_map_compare_key,
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.rbto_node_offset = offsetof(struct vm_map_entry, rb_node),
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.rbto_context = NULL
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};
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/*
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* uvm_rb_gap: return the gap size between our entry and next entry.
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*/
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static inline vsize_t
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uvm_rb_gap(const struct vm_map_entry *entry)
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{
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KASSERT(entry->next != NULL);
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return entry->next->start - entry->end;
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}
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static vsize_t
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uvm_rb_maxgap(const struct vm_map_entry *entry)
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{
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struct vm_map_entry *child;
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vsize_t maxgap = entry->gap;
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/*
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* We need maxgap to be the largest gap of us or any of our
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* descendents. Since each of our children's maxgap is the
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* cached value of their largest gap of themselves or their
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* descendents, we can just use that value and avoid recursing
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* down the tree to calculate it.
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*/
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if ((child = LEFT_ENTRY(entry)) != NULL && maxgap < child->maxgap)
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maxgap = child->maxgap;
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if ((child = RIGHT_ENTRY(entry)) != NULL && maxgap < child->maxgap)
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maxgap = child->maxgap;
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return maxgap;
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}
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static void
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uvm_rb_fixup(struct vm_map *map, struct vm_map_entry *entry)
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{
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struct vm_map_entry *parent;
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KASSERT(entry->gap == uvm_rb_gap(entry));
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entry->maxgap = uvm_rb_maxgap(entry);
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while ((parent = PARENT_ENTRY(map, entry)) != NULL) {
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struct vm_map_entry *brother;
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vsize_t maxgap = parent->gap;
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unsigned int which;
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KDASSERT(parent->gap == uvm_rb_gap(parent));
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if (maxgap < entry->maxgap)
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maxgap = entry->maxgap;
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/*
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* Since we work towards the root, we know entry's maxgap
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* value is OK, but its brothers may now be out-of-date due
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* to rebalancing. So refresh it.
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*/
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which = RB_POSITION(&entry->rb_node) ^ RB_DIR_OTHER;
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brother = (struct vm_map_entry *)parent->rb_node.rb_nodes[which];
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if (brother != NULL) {
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KDASSERT(brother->gap == uvm_rb_gap(brother));
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brother->maxgap = uvm_rb_maxgap(brother);
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if (maxgap < brother->maxgap)
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maxgap = brother->maxgap;
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}
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parent->maxgap = maxgap;
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entry = parent;
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}
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}
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static void
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uvm_rb_insert(struct vm_map *map, struct vm_map_entry *entry)
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{
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struct vm_map_entry *ret __diagused;
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entry->gap = entry->maxgap = uvm_rb_gap(entry);
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if (entry->prev != &map->header)
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entry->prev->gap = uvm_rb_gap(entry->prev);
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ret = rb_tree_insert_node(&map->rb_tree, entry);
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KASSERTMSG(ret == entry,
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"uvm_rb_insert: map %p: duplicate entry %p", map, ret);
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/*
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* If the previous entry is not our immediate left child, then it's an
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* ancestor and will be fixed up on the way to the root. We don't
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* have to check entry->prev against &map->header since &map->header
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* will never be in the tree.
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*/
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uvm_rb_fixup(map,
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LEFT_ENTRY(entry) == entry->prev ? entry->prev : entry);
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}
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static void
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uvm_rb_remove(struct vm_map *map, struct vm_map_entry *entry)
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{
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struct vm_map_entry *prev_parent = NULL, *next_parent = NULL;
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/*
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* If we are removing an interior node, then an adjacent node will
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* be used to replace its position in the tree. Therefore we will
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* need to fixup the tree starting at the parent of the replacement
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* node. So record their parents for later use.
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*/
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if (entry->prev != &map->header)
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prev_parent = PARENT_ENTRY(map, entry->prev);
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if (entry->next != &map->header)
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next_parent = PARENT_ENTRY(map, entry->next);
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rb_tree_remove_node(&map->rb_tree, entry);
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/*
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* If the previous node has a new parent, fixup the tree starting
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* at the previous node's old parent.
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*/
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if (entry->prev != &map->header) {
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/*
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* Update the previous entry's gap due to our absence.
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*/
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entry->prev->gap = uvm_rb_gap(entry->prev);
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uvm_rb_fixup(map, entry->prev);
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if (prev_parent != NULL
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&& prev_parent != entry
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&& prev_parent != PARENT_ENTRY(map, entry->prev))
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|
uvm_rb_fixup(map, prev_parent);
|
|
}
|
|
|
|
/*
|
|
* If the next node has a new parent, fixup the tree starting
|
|
* at the next node's old parent.
|
|
*/
|
|
if (entry->next != &map->header) {
|
|
uvm_rb_fixup(map, entry->next);
|
|
if (next_parent != NULL
|
|
&& next_parent != entry
|
|
&& next_parent != PARENT_ENTRY(map, entry->next))
|
|
uvm_rb_fixup(map, next_parent);
|
|
}
|
|
}
|
|
|
|
#if defined(DEBUG)
|
|
int uvm_debug_check_map = 0;
|
|
int uvm_debug_check_rbtree = 0;
|
|
#define uvm_map_check(map, name) \
|
|
_uvm_map_check((map), (name), __FILE__, __LINE__)
|
|
static void
|
|
_uvm_map_check(struct vm_map *map, const char *name,
|
|
const char *file, int line)
|
|
{
|
|
|
|
if ((uvm_debug_check_map && _uvm_map_sanity(map)) ||
|
|
(uvm_debug_check_rbtree && _uvm_tree_sanity(map))) {
|
|
panic("uvm_map_check failed: \"%s\" map=%p (%s:%d)",
|
|
name, map, file, line);
|
|
}
|
|
}
|
|
#else /* defined(DEBUG) */
|
|
#define uvm_map_check(map, name) /* nothing */
|
|
#endif /* defined(DEBUG) */
|
|
|
|
#if defined(DEBUG) || defined(DDB)
|
|
int
|
|
_uvm_map_sanity(struct vm_map *map)
|
|
{
|
|
bool first_free_found = false;
|
|
bool hint_found = false;
|
|
const struct vm_map_entry *e;
|
|
struct vm_map_entry *hint = map->hint;
|
|
|
|
e = &map->header;
|
|
for (;;) {
|
|
if (map->first_free == e) {
|
|
first_free_found = true;
|
|
} else if (!first_free_found && e->next->start > e->end) {
|
|
printf("first_free %p should be %p\n",
|
|
map->first_free, e);
|
|
return -1;
|
|
}
|
|
if (hint == e) {
|
|
hint_found = true;
|
|
}
|
|
|
|
e = e->next;
|
|
if (e == &map->header) {
|
|
break;
|
|
}
|
|
}
|
|
if (!first_free_found) {
|
|
printf("stale first_free\n");
|
|
return -1;
|
|
}
|
|
if (!hint_found) {
|
|
printf("stale hint\n");
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
_uvm_tree_sanity(struct vm_map *map)
|
|
{
|
|
struct vm_map_entry *tmp, *trtmp;
|
|
int n = 0, i = 1;
|
|
|
|
for (tmp = map->header.next; tmp != &map->header; tmp = tmp->next) {
|
|
if (tmp->gap != uvm_rb_gap(tmp)) {
|
|
printf("%d/%d gap %#lx != %#lx %s\n",
|
|
n + 1, map->nentries,
|
|
(ulong)tmp->gap, (ulong)uvm_rb_gap(tmp),
|
|
tmp->next == &map->header ? "(last)" : "");
|
|
goto error;
|
|
}
|
|
/*
|
|
* If any entries are out of order, tmp->gap will be unsigned
|
|
* and will likely exceed the size of the map.
|
|
*/
|
|
if (tmp->gap >= vm_map_max(map) - vm_map_min(map)) {
|
|
printf("too large gap %zu\n", (size_t)tmp->gap);
|
|
goto error;
|
|
}
|
|
n++;
|
|
}
|
|
|
|
if (n != map->nentries) {
|
|
printf("nentries: %d vs %d\n", n, map->nentries);
|
|
goto error;
|
|
}
|
|
|
|
trtmp = NULL;
|
|
for (tmp = map->header.next; tmp != &map->header; tmp = tmp->next) {
|
|
if (tmp->maxgap != uvm_rb_maxgap(tmp)) {
|
|
printf("maxgap %#lx != %#lx\n",
|
|
(ulong)tmp->maxgap,
|
|
(ulong)uvm_rb_maxgap(tmp));
|
|
goto error;
|
|
}
|
|
if (trtmp != NULL && trtmp->start >= tmp->start) {
|
|
printf("corrupt: 0x%"PRIxVADDR"x >= 0x%"PRIxVADDR"x\n",
|
|
trtmp->start, tmp->start);
|
|
goto error;
|
|
}
|
|
|
|
trtmp = tmp;
|
|
}
|
|
|
|
for (tmp = map->header.next; tmp != &map->header;
|
|
tmp = tmp->next, i++) {
|
|
trtmp = rb_tree_iterate(&map->rb_tree, tmp, RB_DIR_LEFT);
|
|
if (trtmp == NULL)
|
|
trtmp = &map->header;
|
|
if (tmp->prev != trtmp) {
|
|
printf("lookup: %d: %p->prev=%p: %p\n",
|
|
i, tmp, tmp->prev, trtmp);
|
|
goto error;
|
|
}
|
|
trtmp = rb_tree_iterate(&map->rb_tree, tmp, RB_DIR_RIGHT);
|
|
if (trtmp == NULL)
|
|
trtmp = &map->header;
|
|
if (tmp->next != trtmp) {
|
|
printf("lookup: %d: %p->next=%p: %p\n",
|
|
i, tmp, tmp->next, trtmp);
|
|
goto error;
|
|
}
|
|
trtmp = rb_tree_find_node(&map->rb_tree, &tmp->start);
|
|
if (trtmp != tmp) {
|
|
printf("lookup: %d: %p - %p: %p\n", i, tmp, trtmp,
|
|
PARENT_ENTRY(map, tmp));
|
|
goto error;
|
|
}
|
|
}
|
|
|
|
return (0);
|
|
error:
|
|
return (-1);
|
|
}
|
|
#endif /* defined(DEBUG) || defined(DDB) */
|
|
|
|
/*
|
|
* vm_map_lock: acquire an exclusive (write) lock on a map.
|
|
*
|
|
* => The locking protocol provides for guaranteed upgrade from shared ->
|
|
* exclusive by whichever thread currently has the map marked busy.
|
|
* See "LOCKING PROTOCOL NOTES" in uvm_map.h. This is horrible; among
|
|
* other problems, it defeats any fairness guarantees provided by RW
|
|
* locks.
|
|
*/
|
|
|
|
void
|
|
vm_map_lock(struct vm_map *map)
|
|
{
|
|
|
|
for (;;) {
|
|
rw_enter(&map->lock, RW_WRITER);
|
|
if (map->busy == NULL || map->busy == curlwp) {
|
|
break;
|
|
}
|
|
mutex_enter(&map->misc_lock);
|
|
rw_exit(&map->lock);
|
|
if (map->busy != NULL) {
|
|
cv_wait(&map->cv, &map->misc_lock);
|
|
}
|
|
mutex_exit(&map->misc_lock);
|
|
}
|
|
map->timestamp++;
|
|
}
|
|
|
|
/*
|
|
* vm_map_lock_try: try to lock a map, failing if it is already locked.
|
|
*/
|
|
|
|
bool
|
|
vm_map_lock_try(struct vm_map *map)
|
|
{
|
|
|
|
if (!rw_tryenter(&map->lock, RW_WRITER)) {
|
|
return false;
|
|
}
|
|
if (map->busy != NULL) {
|
|
rw_exit(&map->lock);
|
|
return false;
|
|
}
|
|
map->timestamp++;
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* vm_map_unlock: release an exclusive lock on a map.
|
|
*/
|
|
|
|
void
|
|
vm_map_unlock(struct vm_map *map)
|
|
{
|
|
|
|
KASSERT(rw_write_held(&map->lock));
|
|
KASSERT(map->busy == NULL || map->busy == curlwp);
|
|
rw_exit(&map->lock);
|
|
}
|
|
|
|
/*
|
|
* vm_map_unbusy: mark the map as unbusy, and wake any waiters that
|
|
* want an exclusive lock.
|
|
*/
|
|
|
|
void
|
|
vm_map_unbusy(struct vm_map *map)
|
|
{
|
|
|
|
KASSERT(map->busy == curlwp);
|
|
|
|
/*
|
|
* Safe to clear 'busy' and 'waiters' with only a read lock held:
|
|
*
|
|
* o they can only be set with a write lock held
|
|
* o writers are blocked out with a read or write hold
|
|
* o at any time, only one thread owns the set of values
|
|
*/
|
|
mutex_enter(&map->misc_lock);
|
|
map->busy = NULL;
|
|
cv_broadcast(&map->cv);
|
|
mutex_exit(&map->misc_lock);
|
|
}
|
|
|
|
/*
|
|
* vm_map_lock_read: acquire a shared (read) lock on a map.
|
|
*/
|
|
|
|
void
|
|
vm_map_lock_read(struct vm_map *map)
|
|
{
|
|
|
|
rw_enter(&map->lock, RW_READER);
|
|
}
|
|
|
|
/*
|
|
* vm_map_unlock_read: release a shared lock on a map.
|
|
*/
|
|
|
|
void
|
|
vm_map_unlock_read(struct vm_map *map)
|
|
{
|
|
|
|
rw_exit(&map->lock);
|
|
}
|
|
|
|
/*
|
|
* vm_map_busy: mark a map as busy.
|
|
*
|
|
* => the caller must hold the map write locked
|
|
*/
|
|
|
|
void
|
|
vm_map_busy(struct vm_map *map)
|
|
{
|
|
|
|
KASSERT(rw_write_held(&map->lock));
|
|
KASSERT(map->busy == NULL);
|
|
|
|
map->busy = curlwp;
|
|
}
|
|
|
|
/*
|
|
* vm_map_locked_p: return true if the map is write locked.
|
|
*
|
|
* => only for debug purposes like KASSERTs.
|
|
* => should not be used to verify that a map is not locked.
|
|
*/
|
|
|
|
bool
|
|
vm_map_locked_p(struct vm_map *map)
|
|
{
|
|
|
|
return rw_write_held(&map->lock);
|
|
}
|
|
|
|
/*
|
|
* uvm_mapent_alloc: allocate a map entry
|
|
*/
|
|
|
|
static struct vm_map_entry *
|
|
uvm_mapent_alloc(struct vm_map *map, int flags)
|
|
{
|
|
struct vm_map_entry *me;
|
|
int pflags = (flags & UVM_FLAG_NOWAIT) ? PR_NOWAIT : PR_WAITOK;
|
|
UVMHIST_FUNC(__func__); UVMHIST_CALLED(maphist);
|
|
|
|
me = pool_cache_get(&uvm_map_entry_cache, pflags);
|
|
if (__predict_false(me == NULL)) {
|
|
return NULL;
|
|
}
|
|
me->flags = 0;
|
|
|
|
UVMHIST_LOG(maphist, "<- new entry=%#jx [kentry=%jd]", (uintptr_t)me,
|
|
(map == kernel_map), 0, 0);
|
|
return me;
|
|
}
|
|
|
|
/*
|
|
* uvm_mapent_free: free map entry
|
|
*/
|
|
|
|
static void
|
|
uvm_mapent_free(struct vm_map_entry *me)
|
|
{
|
|
UVMHIST_FUNC(__func__);
|
|
UVMHIST_CALLARGS(maphist,"<- freeing map entry=%#jx [flags=%#jx]",
|
|
(uintptr_t)me, me->flags, 0, 0);
|
|
pool_cache_put(&uvm_map_entry_cache, me);
|
|
}
|
|
|
|
/*
|
|
* uvm_mapent_copy: copy a map entry, preserving flags
|
|
*/
|
|
|
|
static inline void
|
|
uvm_mapent_copy(struct vm_map_entry *src, struct vm_map_entry *dst)
|
|
{
|
|
|
|
memcpy(dst, src, sizeof(*dst));
|
|
dst->flags = 0;
|
|
}
|
|
|
|
#if defined(DEBUG)
|
|
static void
|
|
_uvm_mapent_check(const struct vm_map_entry *entry, int line)
|
|
{
|
|
|
|
if (entry->start >= entry->end) {
|
|
goto bad;
|
|
}
|
|
if (UVM_ET_ISOBJ(entry)) {
|
|
if (entry->object.uvm_obj == NULL) {
|
|
goto bad;
|
|
}
|
|
} else if (UVM_ET_ISSUBMAP(entry)) {
|
|
if (entry->object.sub_map == NULL) {
|
|
goto bad;
|
|
}
|
|
} else {
|
|
if (entry->object.uvm_obj != NULL ||
|
|
entry->object.sub_map != NULL) {
|
|
goto bad;
|
|
}
|
|
}
|
|
if (!UVM_ET_ISOBJ(entry)) {
|
|
if (entry->offset != 0) {
|
|
goto bad;
|
|
}
|
|
}
|
|
|
|
return;
|
|
|
|
bad:
|
|
panic("%s: bad entry %p, line %d", __func__, entry, line);
|
|
}
|
|
#endif /* defined(DEBUG) */
|
|
|
|
/*
|
|
* uvm_map_entry_unwire: unwire a map entry
|
|
*
|
|
* => map should be locked by caller
|
|
*/
|
|
|
|
static inline void
|
|
uvm_map_entry_unwire(struct vm_map *map, struct vm_map_entry *entry)
|
|
{
|
|
|
|
entry->wired_count = 0;
|
|
uvm_fault_unwire_locked(map, entry->start, entry->end);
|
|
}
|
|
|
|
|
|
/*
|
|
* wrapper for calling amap_ref()
|
|
*/
|
|
static inline void
|
|
uvm_map_reference_amap(struct vm_map_entry *entry, int flags)
|
|
{
|
|
|
|
amap_ref(entry->aref.ar_amap, entry->aref.ar_pageoff,
|
|
(entry->end - entry->start) >> PAGE_SHIFT, flags);
|
|
}
|
|
|
|
|
|
/*
|
|
* wrapper for calling amap_unref()
|
|
*/
|
|
static inline void
|
|
uvm_map_unreference_amap(struct vm_map_entry *entry, int flags)
|
|
{
|
|
|
|
amap_unref(entry->aref.ar_amap, entry->aref.ar_pageoff,
|
|
(entry->end - entry->start) >> PAGE_SHIFT, flags);
|
|
}
|
|
|
|
|
|
/*
|
|
* uvm_map_init: init mapping system at boot time.
|
|
*/
|
|
|
|
void
|
|
uvm_map_init(void)
|
|
{
|
|
/*
|
|
* first, init logging system.
|
|
*/
|
|
|
|
UVMHIST_FUNC(__func__);
|
|
UVMHIST_LINK_STATIC(maphist);
|
|
UVMHIST_LINK_STATIC(pdhist);
|
|
UVMHIST_CALLED(maphist);
|
|
UVMHIST_LOG(maphist,"<starting uvm map system>", 0, 0, 0, 0);
|
|
|
|
/*
|
|
* initialize the global lock for kernel map entry.
|
|
*/
|
|
|
|
mutex_init(&uvm_kentry_lock, MUTEX_DRIVER, IPL_VM);
|
|
}
|
|
|
|
/*
|
|
* uvm_map_init_caches: init mapping system caches.
|
|
*/
|
|
void
|
|
uvm_map_init_caches(void)
|
|
{
|
|
/*
|
|
* initialize caches.
|
|
*/
|
|
|
|
pool_cache_bootstrap(&uvm_map_entry_cache, sizeof(struct vm_map_entry),
|
|
coherency_unit, 0, PR_LARGECACHE, "vmmpepl", NULL, IPL_NONE, NULL,
|
|
NULL, NULL);
|
|
}
|
|
|
|
/*
|
|
* clippers
|
|
*/
|
|
|
|
/*
|
|
* uvm_mapent_splitadj: adjust map entries for splitting, after uvm_mapent_copy.
|
|
*/
|
|
|
|
static void
|
|
uvm_mapent_splitadj(struct vm_map_entry *entry1, struct vm_map_entry *entry2,
|
|
vaddr_t splitat)
|
|
{
|
|
vaddr_t adj;
|
|
|
|
KASSERT(entry1->start < splitat);
|
|
KASSERT(splitat < entry1->end);
|
|
|
|
adj = splitat - entry1->start;
|
|
entry1->end = entry2->start = splitat;
|
|
|
|
if (entry1->aref.ar_amap) {
|
|
amap_splitref(&entry1->aref, &entry2->aref, adj);
|
|
}
|
|
if (UVM_ET_ISSUBMAP(entry1)) {
|
|
/* ... unlikely to happen, but play it safe */
|
|
uvm_map_reference(entry1->object.sub_map);
|
|
} else if (UVM_ET_ISOBJ(entry1)) {
|
|
KASSERT(entry1->object.uvm_obj != NULL); /* suppress coverity */
|
|
entry2->offset += adj;
|
|
if (entry1->object.uvm_obj->pgops &&
|
|
entry1->object.uvm_obj->pgops->pgo_reference)
|
|
entry1->object.uvm_obj->pgops->pgo_reference(
|
|
entry1->object.uvm_obj);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* uvm_map_clip_start: ensure that the entry begins at or after
|
|
* the starting address, if it doesn't we split the entry.
|
|
*
|
|
* => caller should use UVM_MAP_CLIP_START macro rather than calling
|
|
* this directly
|
|
* => map must be locked by caller
|
|
*/
|
|
|
|
void
|
|
uvm_map_clip_start(struct vm_map *map, struct vm_map_entry *entry,
|
|
vaddr_t start)
|
|
{
|
|
struct vm_map_entry *new_entry;
|
|
|
|
/* uvm_map_simplify_entry(map, entry); */ /* XXX */
|
|
|
|
uvm_map_check(map, "clip_start entry");
|
|
uvm_mapent_check(entry);
|
|
|
|
/*
|
|
* Split off the front portion. note that we must insert the new
|
|
* entry BEFORE this one, so that this entry has the specified
|
|
* starting address.
|
|
*/
|
|
new_entry = uvm_mapent_alloc(map, 0);
|
|
uvm_mapent_copy(entry, new_entry); /* entry -> new_entry */
|
|
uvm_mapent_splitadj(new_entry, entry, start);
|
|
uvm_map_entry_link(map, entry->prev, new_entry);
|
|
|
|
uvm_map_check(map, "clip_start leave");
|
|
}
|
|
|
|
/*
|
|
* uvm_map_clip_end: ensure that the entry ends at or before
|
|
* the ending address, if it does't we split the reference
|
|
*
|
|
* => caller should use UVM_MAP_CLIP_END macro rather than calling
|
|
* this directly
|
|
* => map must be locked by caller
|
|
*/
|
|
|
|
void
|
|
uvm_map_clip_end(struct vm_map *map, struct vm_map_entry *entry, vaddr_t end)
|
|
{
|
|
struct vm_map_entry *new_entry;
|
|
|
|
uvm_map_check(map, "clip_end entry");
|
|
uvm_mapent_check(entry);
|
|
|
|
/*
|
|
* Create a new entry and insert it
|
|
* AFTER the specified entry
|
|
*/
|
|
new_entry = uvm_mapent_alloc(map, 0);
|
|
uvm_mapent_copy(entry, new_entry); /* entry -> new_entry */
|
|
uvm_mapent_splitadj(entry, new_entry, end);
|
|
uvm_map_entry_link(map, entry, new_entry);
|
|
|
|
uvm_map_check(map, "clip_end leave");
|
|
}
|
|
|
|
/*
|
|
* M A P - m a i n e n t r y p o i n t
|
|
*/
|
|
/*
|
|
* uvm_map: establish a valid mapping in a map
|
|
*
|
|
* => assume startp is page aligned.
|
|
* => assume size is a multiple of PAGE_SIZE.
|
|
* => assume sys_mmap provides enough of a "hint" to have us skip
|
|
* over text/data/bss area.
|
|
* => map must be unlocked (we will lock it)
|
|
* => <uobj,uoffset> value meanings (4 cases):
|
|
* [1] <NULL,uoffset> == uoffset is a hint for PMAP_PREFER
|
|
* [2] <NULL,UVM_UNKNOWN_OFFSET> == don't PMAP_PREFER
|
|
* [3] <uobj,uoffset> == normal mapping
|
|
* [4] <uobj,UVM_UNKNOWN_OFFSET> == uvm_map finds offset based on VA
|
|
*
|
|
* case [4] is for kernel mappings where we don't know the offset until
|
|
* we've found a virtual address. note that kernel object offsets are
|
|
* always relative to vm_map_min(kernel_map).
|
|
*
|
|
* => if `align' is non-zero, we align the virtual address to the specified
|
|
* alignment.
|
|
* this is provided as a mechanism for large pages.
|
|
*
|
|
* => XXXCDC: need way to map in external amap?
|
|
*/
|
|
|
|
int
|
|
uvm_map(struct vm_map *map, vaddr_t *startp /* IN/OUT */, vsize_t size,
|
|
struct uvm_object *uobj, voff_t uoffset, vsize_t align, uvm_flag_t flags)
|
|
{
|
|
struct uvm_map_args args;
|
|
struct vm_map_entry *new_entry;
|
|
int error;
|
|
|
|
KASSERT((size & PAGE_MASK) == 0);
|
|
KASSERT((flags & UVM_FLAG_FIXED) == 0 || align == 0);
|
|
|
|
/*
|
|
* for pager_map, allocate the new entry first to avoid sleeping
|
|
* for memory while we have the map locked.
|
|
*/
|
|
|
|
new_entry = NULL;
|
|
if (map == pager_map) {
|
|
new_entry = uvm_mapent_alloc(map, (flags & UVM_FLAG_NOWAIT));
|
|
if (__predict_false(new_entry == NULL))
|
|
return ENOMEM;
|
|
}
|
|
if (map == pager_map)
|
|
flags |= UVM_FLAG_NOMERGE;
|
|
|
|
error = uvm_map_prepare(map, *startp, size, uobj, uoffset, align,
|
|
flags, &args);
|
|
if (!error) {
|
|
error = uvm_map_enter(map, &args, new_entry);
|
|
*startp = args.uma_start;
|
|
} else if (new_entry) {
|
|
uvm_mapent_free(new_entry);
|
|
}
|
|
|
|
#if defined(DEBUG)
|
|
if (!error && VM_MAP_IS_KERNEL(map) && (flags & UVM_FLAG_NOWAIT) == 0) {
|
|
uvm_km_check_empty(map, *startp, *startp + size);
|
|
}
|
|
#endif /* defined(DEBUG) */
|
|
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* uvm_map_prepare:
|
|
*
|
|
* called with map unlocked.
|
|
* on success, returns the map locked.
|
|
*/
|
|
|
|
int
|
|
uvm_map_prepare(struct vm_map *map, vaddr_t start, vsize_t size,
|
|
struct uvm_object *uobj, voff_t uoffset, vsize_t align, uvm_flag_t flags,
|
|
struct uvm_map_args *args)
|
|
{
|
|
struct vm_map_entry *prev_entry;
|
|
vm_prot_t prot = UVM_PROTECTION(flags);
|
|
vm_prot_t maxprot = UVM_MAXPROTECTION(flags);
|
|
|
|
UVMHIST_FUNC(__func__);
|
|
UVMHIST_CALLARGS(maphist, "(map=%#jx, start=%#jx, size=%jx, flags=%#jx)",
|
|
(uintptr_t)map, start, size, flags);
|
|
UVMHIST_LOG(maphist, " uobj/offset %#jx/%jd", (uintptr_t)uobj,
|
|
uoffset,0,0);
|
|
|
|
/*
|
|
* detect a popular device driver bug.
|
|
*/
|
|
|
|
KASSERT(doing_shutdown || curlwp != NULL);
|
|
|
|
/*
|
|
* zero-sized mapping doesn't make any sense.
|
|
*/
|
|
KASSERT(size > 0);
|
|
|
|
KASSERT((~flags & (UVM_FLAG_NOWAIT | UVM_FLAG_WAITVA)) != 0);
|
|
|
|
uvm_map_check(map, "map entry");
|
|
|
|
/*
|
|
* check sanity of protection code
|
|
*/
|
|
|
|
if ((prot & maxprot) != prot) {
|
|
UVMHIST_LOG(maphist, "<- prot. failure: prot=%#jx, max=%#jx",
|
|
prot, maxprot,0,0);
|
|
return EACCES;
|
|
}
|
|
|
|
/*
|
|
* figure out where to put new VM range
|
|
*/
|
|
retry:
|
|
if (vm_map_lock_try(map) == false) {
|
|
if ((flags & UVM_FLAG_TRYLOCK) != 0) {
|
|
return EAGAIN;
|
|
}
|
|
vm_map_lock(map); /* could sleep here */
|
|
}
|
|
if (flags & UVM_FLAG_UNMAP) {
|
|
KASSERT(flags & UVM_FLAG_FIXED);
|
|
KASSERT((flags & UVM_FLAG_NOWAIT) == 0);
|
|
|
|
/*
|
|
* Set prev_entry to what it will need to be after any existing
|
|
* entries are removed later in uvm_map_enter().
|
|
*/
|
|
|
|
if (uvm_map_lookup_entry(map, start, &prev_entry)) {
|
|
if (start == prev_entry->start)
|
|
prev_entry = prev_entry->prev;
|
|
else
|
|
UVM_MAP_CLIP_END(map, prev_entry, start);
|
|
SAVE_HINT(map, map->hint, prev_entry);
|
|
}
|
|
} else {
|
|
prev_entry = uvm_map_findspace(map, start, size, &start,
|
|
uobj, uoffset, align, flags);
|
|
}
|
|
if (prev_entry == NULL) {
|
|
unsigned int timestamp;
|
|
|
|
timestamp = map->timestamp;
|
|
UVMHIST_LOG(maphist,"waiting va timestamp=%#jx",
|
|
timestamp,0,0,0);
|
|
map->flags |= VM_MAP_WANTVA;
|
|
vm_map_unlock(map);
|
|
|
|
/*
|
|
* try to reclaim kva and wait until someone does unmap.
|
|
* fragile locking here, so we awaken every second to
|
|
* recheck the condition.
|
|
*/
|
|
|
|
mutex_enter(&map->misc_lock);
|
|
while ((map->flags & VM_MAP_WANTVA) != 0 &&
|
|
map->timestamp == timestamp) {
|
|
if ((flags & UVM_FLAG_WAITVA) == 0) {
|
|
mutex_exit(&map->misc_lock);
|
|
UVMHIST_LOG(maphist,
|
|
"<- uvm_map_findspace failed!", 0,0,0,0);
|
|
return ENOMEM;
|
|
} else {
|
|
cv_timedwait(&map->cv, &map->misc_lock, hz);
|
|
}
|
|
}
|
|
mutex_exit(&map->misc_lock);
|
|
goto retry;
|
|
}
|
|
|
|
#ifdef PMAP_GROWKERNEL
|
|
/*
|
|
* If the kernel pmap can't map the requested space,
|
|
* then allocate more resources for it.
|
|
*/
|
|
if (map == kernel_map && uvm_maxkaddr < (start + size))
|
|
uvm_maxkaddr = pmap_growkernel(start + size);
|
|
#endif
|
|
|
|
UVMMAP_EVCNT_INCR(map_call);
|
|
|
|
/*
|
|
* if uobj is null, then uoffset is either a VAC hint for PMAP_PREFER
|
|
* [typically from uvm_map_reserve] or it is UVM_UNKNOWN_OFFSET. in
|
|
* either case we want to zero it before storing it in the map entry
|
|
* (because it looks strange and confusing when debugging...)
|
|
*
|
|
* if uobj is not null
|
|
* if uoffset is not UVM_UNKNOWN_OFFSET then we have a normal mapping
|
|
* and we do not need to change uoffset.
|
|
* if uoffset is UVM_UNKNOWN_OFFSET then we need to find the offset
|
|
* now (based on the starting address of the map). this case is
|
|
* for kernel object mappings where we don't know the offset until
|
|
* the virtual address is found (with uvm_map_findspace). the
|
|
* offset is the distance we are from the start of the map.
|
|
*/
|
|
|
|
if (uobj == NULL) {
|
|
uoffset = 0;
|
|
} else {
|
|
if (uoffset == UVM_UNKNOWN_OFFSET) {
|
|
KASSERT(UVM_OBJ_IS_KERN_OBJECT(uobj));
|
|
uoffset = start - vm_map_min(kernel_map);
|
|
}
|
|
}
|
|
|
|
args->uma_flags = flags;
|
|
args->uma_prev = prev_entry;
|
|
args->uma_start = start;
|
|
args->uma_size = size;
|
|
args->uma_uobj = uobj;
|
|
args->uma_uoffset = uoffset;
|
|
|
|
UVMHIST_LOG(maphist, "<- done!", 0,0,0,0);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* uvm_map_enter:
|
|
*
|
|
* called with map locked.
|
|
* unlock the map before returning.
|
|
*/
|
|
|
|
int
|
|
uvm_map_enter(struct vm_map *map, const struct uvm_map_args *args,
|
|
struct vm_map_entry *new_entry)
|
|
{
|
|
struct vm_map_entry *prev_entry = args->uma_prev;
|
|
struct vm_map_entry *dead = NULL, *dead_entries = NULL;
|
|
|
|
const uvm_flag_t flags = args->uma_flags;
|
|
const vm_prot_t prot = UVM_PROTECTION(flags);
|
|
const vm_prot_t maxprot = UVM_MAXPROTECTION(flags);
|
|
const vm_inherit_t inherit = UVM_INHERIT(flags);
|
|
const int amapwaitflag = (flags & UVM_FLAG_NOWAIT) ?
|
|
AMAP_EXTEND_NOWAIT : 0;
|
|
const int advice = UVM_ADVICE(flags);
|
|
|
|
vaddr_t start = args->uma_start;
|
|
vsize_t size = args->uma_size;
|
|
struct uvm_object *uobj = args->uma_uobj;
|
|
voff_t uoffset = args->uma_uoffset;
|
|
|
|
const int kmap = (vm_map_pmap(map) == pmap_kernel());
|
|
int merged = 0;
|
|
int error;
|
|
int newetype;
|
|
|
|
UVMHIST_FUNC(__func__);
|
|
UVMHIST_CALLARGS(maphist, "(map=%#jx, start=%#jx, size=%ju, flags=%#jx)",
|
|
(uintptr_t)map, start, size, flags);
|
|
UVMHIST_LOG(maphist, " uobj/offset %#jx/%jd", (uintptr_t)uobj,
|
|
uoffset,0,0);
|
|
|
|
KASSERT(map->hint == prev_entry); /* bimerge case assumes this */
|
|
KASSERT(vm_map_locked_p(map));
|
|
KASSERT((flags & (UVM_FLAG_NOWAIT | UVM_FLAG_UNMAP)) !=
|
|
(UVM_FLAG_NOWAIT | UVM_FLAG_UNMAP));
|
|
|
|
if (uobj)
|
|
newetype = UVM_ET_OBJ;
|
|
else
|
|
newetype = 0;
|
|
|
|
if (flags & UVM_FLAG_COPYONW) {
|
|
newetype |= UVM_ET_COPYONWRITE;
|
|
if ((flags & UVM_FLAG_OVERLAY) == 0)
|
|
newetype |= UVM_ET_NEEDSCOPY;
|
|
}
|
|
|
|
/*
|
|
* For mappings with unmap, remove any old entries now. Adding the new
|
|
* entry cannot fail because that can only happen if UVM_FLAG_NOWAIT
|
|
* is set, and we do not support nowait and unmap together.
|
|
*/
|
|
|
|
if (flags & UVM_FLAG_UNMAP) {
|
|
KASSERT(flags & UVM_FLAG_FIXED);
|
|
uvm_unmap_remove(map, start, start + size, &dead_entries, 0);
|
|
#ifdef DEBUG
|
|
struct vm_map_entry *tmp_entry __diagused;
|
|
bool rv __diagused;
|
|
|
|
rv = uvm_map_lookup_entry(map, start, &tmp_entry);
|
|
KASSERT(!rv);
|
|
KASSERTMSG(prev_entry == tmp_entry,
|
|
"args %p prev_entry %p tmp_entry %p",
|
|
args, prev_entry, tmp_entry);
|
|
#endif
|
|
SAVE_HINT(map, map->hint, prev_entry);
|
|
}
|
|
|
|
/*
|
|
* try and insert in map by extending previous entry, if possible.
|
|
* XXX: we don't try and pull back the next entry. might be useful
|
|
* for a stack, but we are currently allocating our stack in advance.
|
|
*/
|
|
|
|
if (flags & UVM_FLAG_NOMERGE)
|
|
goto nomerge;
|
|
|
|
if (prev_entry->end == start &&
|
|
prev_entry != &map->header &&
|
|
UVM_ET_ISCOMPATIBLE(prev_entry, newetype, uobj, 0,
|
|
prot, maxprot, inherit, advice, 0)) {
|
|
|
|
if (uobj && prev_entry->offset +
|
|
(prev_entry->end - prev_entry->start) != uoffset)
|
|
goto forwardmerge;
|
|
|
|
/*
|
|
* can't extend a shared amap. note: no need to lock amap to
|
|
* look at refs since we don't care about its exact value.
|
|
* if it is one (i.e. we have only reference) it will stay there
|
|
*/
|
|
|
|
if (prev_entry->aref.ar_amap &&
|
|
amap_refs(prev_entry->aref.ar_amap) != 1) {
|
|
goto forwardmerge;
|
|
}
|
|
|
|
if (prev_entry->aref.ar_amap) {
|
|
error = amap_extend(prev_entry, size,
|
|
amapwaitflag | AMAP_EXTEND_FORWARDS);
|
|
if (error)
|
|
goto nomerge;
|
|
}
|
|
|
|
if (kmap) {
|
|
UVMMAP_EVCNT_INCR(kbackmerge);
|
|
} else {
|
|
UVMMAP_EVCNT_INCR(ubackmerge);
|
|
}
|
|
UVMHIST_LOG(maphist," starting back merge", 0, 0, 0, 0);
|
|
|
|
/*
|
|
* drop our reference to uobj since we are extending a reference
|
|
* that we already have (the ref count can not drop to zero).
|
|
*/
|
|
|
|
if (uobj && uobj->pgops->pgo_detach)
|
|
uobj->pgops->pgo_detach(uobj);
|
|
|
|
/*
|
|
* Now that we've merged the entries, note that we've grown
|
|
* and our gap has shrunk. Then fix the tree.
|
|
*/
|
|
prev_entry->end += size;
|
|
prev_entry->gap -= size;
|
|
uvm_rb_fixup(map, prev_entry);
|
|
|
|
uvm_map_check(map, "map backmerged");
|
|
|
|
UVMHIST_LOG(maphist,"<- done (via backmerge)!", 0, 0, 0, 0);
|
|
merged++;
|
|
}
|
|
|
|
forwardmerge:
|
|
if (prev_entry->next->start == (start + size) &&
|
|
prev_entry->next != &map->header &&
|
|
UVM_ET_ISCOMPATIBLE(prev_entry->next, newetype, uobj, 0,
|
|
prot, maxprot, inherit, advice, 0)) {
|
|
|
|
if (uobj && prev_entry->next->offset != uoffset + size)
|
|
goto nomerge;
|
|
|
|
/*
|
|
* can't extend a shared amap. note: no need to lock amap to
|
|
* look at refs since we don't care about its exact value.
|
|
* if it is one (i.e. we have only reference) it will stay there.
|
|
*
|
|
* note that we also can't merge two amaps, so if we
|
|
* merged with the previous entry which has an amap,
|
|
* and the next entry also has an amap, we give up.
|
|
*
|
|
* Interesting cases:
|
|
* amap, new, amap -> give up second merge (single fwd extend)
|
|
* amap, new, none -> double forward extend (extend again here)
|
|
* none, new, amap -> double backward extend (done here)
|
|
* uobj, new, amap -> single backward extend (done here)
|
|
*
|
|
* XXX should we attempt to deal with someone refilling
|
|
* the deallocated region between two entries that are
|
|
* backed by the same amap (ie, arefs is 2, "prev" and
|
|
* "next" refer to it, and adding this allocation will
|
|
* close the hole, thus restoring arefs to 1 and
|
|
* deallocating the "next" vm_map_entry)? -- @@@
|
|
*/
|
|
|
|
if (prev_entry->next->aref.ar_amap &&
|
|
(amap_refs(prev_entry->next->aref.ar_amap) != 1 ||
|
|
(merged && prev_entry->aref.ar_amap))) {
|
|
goto nomerge;
|
|
}
|
|
|
|
if (merged) {
|
|
/*
|
|
* Try to extend the amap of the previous entry to
|
|
* cover the next entry as well. If it doesn't work
|
|
* just skip on, don't actually give up, since we've
|
|
* already completed the back merge.
|
|
*/
|
|
if (prev_entry->aref.ar_amap) {
|
|
if (amap_extend(prev_entry,
|
|
prev_entry->next->end -
|
|
prev_entry->next->start,
|
|
amapwaitflag | AMAP_EXTEND_FORWARDS))
|
|
goto nomerge;
|
|
}
|
|
|
|
/*
|
|
* Try to extend the amap of the *next* entry
|
|
* back to cover the new allocation *and* the
|
|
* previous entry as well (the previous merge
|
|
* didn't have an amap already otherwise we
|
|
* wouldn't be checking here for an amap). If
|
|
* it doesn't work just skip on, again, don't
|
|
* actually give up, since we've already
|
|
* completed the back merge.
|
|
*/
|
|
else if (prev_entry->next->aref.ar_amap) {
|
|
if (amap_extend(prev_entry->next,
|
|
prev_entry->end -
|
|
prev_entry->start,
|
|
amapwaitflag | AMAP_EXTEND_BACKWARDS))
|
|
goto nomerge;
|
|
}
|
|
} else {
|
|
/*
|
|
* Pull the next entry's amap backwards to cover this
|
|
* new allocation.
|
|
*/
|
|
if (prev_entry->next->aref.ar_amap) {
|
|
error = amap_extend(prev_entry->next, size,
|
|
amapwaitflag | AMAP_EXTEND_BACKWARDS);
|
|
if (error)
|
|
goto nomerge;
|
|
}
|
|
}
|
|
|
|
if (merged) {
|
|
if (kmap) {
|
|
UVMMAP_EVCNT_DECR(kbackmerge);
|
|
UVMMAP_EVCNT_INCR(kbimerge);
|
|
} else {
|
|
UVMMAP_EVCNT_DECR(ubackmerge);
|
|
UVMMAP_EVCNT_INCR(ubimerge);
|
|
}
|
|
} else {
|
|
if (kmap) {
|
|
UVMMAP_EVCNT_INCR(kforwmerge);
|
|
} else {
|
|
UVMMAP_EVCNT_INCR(uforwmerge);
|
|
}
|
|
}
|
|
UVMHIST_LOG(maphist," starting forward merge", 0, 0, 0, 0);
|
|
|
|
/*
|
|
* drop our reference to uobj since we are extending a reference
|
|
* that we already have (the ref count can not drop to zero).
|
|
*/
|
|
if (uobj && uobj->pgops->pgo_detach)
|
|
uobj->pgops->pgo_detach(uobj);
|
|
|
|
if (merged) {
|
|
dead = prev_entry->next;
|
|
prev_entry->end = dead->end;
|
|
uvm_map_entry_unlink(map, dead);
|
|
if (dead->aref.ar_amap != NULL) {
|
|
prev_entry->aref = dead->aref;
|
|
dead->aref.ar_amap = NULL;
|
|
}
|
|
} else {
|
|
prev_entry->next->start -= size;
|
|
if (prev_entry != &map->header) {
|
|
prev_entry->gap -= size;
|
|
KASSERT(prev_entry->gap == uvm_rb_gap(prev_entry));
|
|
uvm_rb_fixup(map, prev_entry);
|
|
}
|
|
if (uobj)
|
|
prev_entry->next->offset = uoffset;
|
|
}
|
|
|
|
uvm_map_check(map, "map forwardmerged");
|
|
|
|
UVMHIST_LOG(maphist,"<- done forwardmerge", 0, 0, 0, 0);
|
|
merged++;
|
|
}
|
|
|
|
nomerge:
|
|
if (!merged) {
|
|
UVMHIST_LOG(maphist," allocating new map entry", 0, 0, 0, 0);
|
|
if (kmap) {
|
|
UVMMAP_EVCNT_INCR(knomerge);
|
|
} else {
|
|
UVMMAP_EVCNT_INCR(unomerge);
|
|
}
|
|
|
|
/*
|
|
* allocate new entry and link it in.
|
|
*/
|
|
|
|
if (new_entry == NULL) {
|
|
new_entry = uvm_mapent_alloc(map,
|
|
(flags & UVM_FLAG_NOWAIT));
|
|
if (__predict_false(new_entry == NULL)) {
|
|
error = ENOMEM;
|
|
goto done;
|
|
}
|
|
}
|
|
new_entry->start = start;
|
|
new_entry->end = new_entry->start + size;
|
|
new_entry->object.uvm_obj = uobj;
|
|
new_entry->offset = uoffset;
|
|
|
|
new_entry->etype = newetype;
|
|
|
|
if (flags & UVM_FLAG_NOMERGE) {
|
|
new_entry->flags |= UVM_MAP_NOMERGE;
|
|
}
|
|
|
|
new_entry->protection = prot;
|
|
new_entry->max_protection = maxprot;
|
|
new_entry->inheritance = inherit;
|
|
new_entry->wired_count = 0;
|
|
new_entry->advice = advice;
|
|
if (flags & UVM_FLAG_OVERLAY) {
|
|
|
|
/*
|
|
* to_add: for BSS we overallocate a little since we
|
|
* are likely to extend
|
|
*/
|
|
|
|
vaddr_t to_add = (flags & UVM_FLAG_AMAPPAD) ?
|
|
UVM_AMAP_CHUNK << PAGE_SHIFT : 0;
|
|
struct vm_amap *amap = amap_alloc(size, to_add,
|
|
(flags & UVM_FLAG_NOWAIT));
|
|
if (__predict_false(amap == NULL)) {
|
|
error = ENOMEM;
|
|
goto done;
|
|
}
|
|
new_entry->aref.ar_pageoff = 0;
|
|
new_entry->aref.ar_amap = amap;
|
|
} else {
|
|
new_entry->aref.ar_pageoff = 0;
|
|
new_entry->aref.ar_amap = NULL;
|
|
}
|
|
uvm_map_entry_link(map, prev_entry, new_entry);
|
|
|
|
/*
|
|
* Update the free space hint
|
|
*/
|
|
|
|
if ((map->first_free == prev_entry) &&
|
|
(prev_entry->end >= new_entry->start))
|
|
map->first_free = new_entry;
|
|
|
|
new_entry = NULL;
|
|
}
|
|
|
|
map->size += size;
|
|
|
|
UVMHIST_LOG(maphist,"<- done!", 0, 0, 0, 0);
|
|
|
|
error = 0;
|
|
|
|
done:
|
|
vm_map_unlock(map);
|
|
|
|
if (new_entry) {
|
|
uvm_mapent_free(new_entry);
|
|
}
|
|
if (dead) {
|
|
KDASSERT(merged);
|
|
uvm_mapent_free(dead);
|
|
}
|
|
if (dead_entries)
|
|
uvm_unmap_detach(dead_entries, 0);
|
|
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* uvm_map_lookup_entry_bytree: lookup an entry in tree
|
|
*/
|
|
|
|
static inline bool
|
|
uvm_map_lookup_entry_bytree(struct vm_map *map, vaddr_t address,
|
|
struct vm_map_entry **entry /* OUT */)
|
|
{
|
|
struct vm_map_entry *prev = &map->header;
|
|
struct vm_map_entry *cur = ROOT_ENTRY(map);
|
|
|
|
while (cur) {
|
|
UVMMAP_EVCNT_INCR(mlk_treeloop);
|
|
if (address >= cur->start) {
|
|
if (address < cur->end) {
|
|
*entry = cur;
|
|
return true;
|
|
}
|
|
prev = cur;
|
|
cur = RIGHT_ENTRY(cur);
|
|
} else
|
|
cur = LEFT_ENTRY(cur);
|
|
}
|
|
*entry = prev;
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* uvm_map_lookup_entry: find map entry at or before an address
|
|
*
|
|
* => map must at least be read-locked by caller
|
|
* => entry is returned in "entry"
|
|
* => return value is true if address is in the returned entry
|
|
*/
|
|
|
|
bool
|
|
uvm_map_lookup_entry(struct vm_map *map, vaddr_t address,
|
|
struct vm_map_entry **entry /* OUT */)
|
|
{
|
|
struct vm_map_entry *cur;
|
|
UVMHIST_FUNC(__func__);
|
|
UVMHIST_CALLARGS(maphist,"(map=%#jx,addr=%#jx,ent=%#jx)",
|
|
(uintptr_t)map, address, (uintptr_t)entry, 0);
|
|
|
|
/*
|
|
* make a quick check to see if we are already looking at
|
|
* the entry we want (which is usually the case). note also
|
|
* that we don't need to save the hint here... it is the
|
|
* same hint (unless we are at the header, in which case the
|
|
* hint didn't buy us anything anyway).
|
|
*/
|
|
|
|
cur = map->hint;
|
|
UVMMAP_EVCNT_INCR(mlk_call);
|
|
if (cur != &map->header &&
|
|
address >= cur->start && cur->end > address) {
|
|
UVMMAP_EVCNT_INCR(mlk_hint);
|
|
*entry = cur;
|
|
UVMHIST_LOG(maphist,"<- got it via hint (%#jx)",
|
|
(uintptr_t)cur, 0, 0, 0);
|
|
uvm_mapent_check(*entry);
|
|
return (true);
|
|
}
|
|
uvm_map_check(map, __func__);
|
|
|
|
/*
|
|
* lookup in the tree.
|
|
*/
|
|
|
|
UVMMAP_EVCNT_INCR(mlk_tree);
|
|
if (__predict_true(uvm_map_lookup_entry_bytree(map, address, entry))) {
|
|
SAVE_HINT(map, map->hint, *entry);
|
|
UVMHIST_LOG(maphist,"<- search got it (%#jx)",
|
|
(uintptr_t)cur, 0, 0, 0);
|
|
KDASSERT((*entry)->start <= address);
|
|
KDASSERT(address < (*entry)->end);
|
|
uvm_mapent_check(*entry);
|
|
return (true);
|
|
}
|
|
|
|
SAVE_HINT(map, map->hint, *entry);
|
|
UVMHIST_LOG(maphist,"<- failed!",0,0,0,0);
|
|
KDASSERT((*entry) == &map->header || (*entry)->end <= address);
|
|
KDASSERT((*entry)->next == &map->header ||
|
|
address < (*entry)->next->start);
|
|
return (false);
|
|
}
|
|
|
|
/*
|
|
* See if the range between start and start + length fits in the gap
|
|
* entry->next->start and entry->end. Returns 1 if fits, 0 if doesn't
|
|
* fit, and -1 address wraps around.
|
|
*/
|
|
static int
|
|
uvm_map_space_avail(vaddr_t *start, vsize_t length, voff_t uoffset,
|
|
vsize_t align, int flags, int topdown, struct vm_map_entry *entry)
|
|
{
|
|
vaddr_t end;
|
|
|
|
#ifdef PMAP_PREFER
|
|
/*
|
|
* push start address forward as needed to avoid VAC alias problems.
|
|
* we only do this if a valid offset is specified.
|
|
*/
|
|
|
|
if (uoffset != UVM_UNKNOWN_OFFSET)
|
|
PMAP_PREFER(uoffset, start, length, topdown);
|
|
#endif
|
|
if ((flags & UVM_FLAG_COLORMATCH) != 0) {
|
|
KASSERT(align < uvmexp.ncolors);
|
|
if (uvmexp.ncolors > 1) {
|
|
const u_int colormask = uvmexp.colormask;
|
|
const u_int colorsize = colormask + 1;
|
|
vaddr_t hint = atop(*start);
|
|
const u_int color = hint & colormask;
|
|
if (color != align) {
|
|
hint -= color; /* adjust to color boundary */
|
|
KASSERT((hint & colormask) == 0);
|
|
if (topdown) {
|
|
if (align > color)
|
|
hint -= colorsize;
|
|
} else {
|
|
if (align < color)
|
|
hint += colorsize;
|
|
}
|
|
*start = ptoa(hint + align); /* adjust to color */
|
|
}
|
|
}
|
|
} else {
|
|
KASSERT(powerof2(align));
|
|
uvm_map_align_va(start, align, topdown);
|
|
/*
|
|
* XXX Should we PMAP_PREFER() here again?
|
|
* eh...i think we're okay
|
|
*/
|
|
}
|
|
|
|
/*
|
|
* Find the end of the proposed new region. Be sure we didn't
|
|
* wrap around the address; if so, we lose. Otherwise, if the
|
|
* proposed new region fits before the next entry, we win.
|
|
*/
|
|
|
|
end = *start + length;
|
|
if (end < *start)
|
|
return (-1);
|
|
|
|
if (entry->next->start >= end && *start >= entry->end)
|
|
return (1);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
uvm_findspace_invariants(struct vm_map *map, vaddr_t orig_hint, vaddr_t length,
|
|
struct uvm_object *uobj, voff_t uoffset, vsize_t align, int flags,
|
|
vaddr_t hint, struct vm_map_entry *entry, int line)
|
|
{
|
|
const int topdown = map->flags & VM_MAP_TOPDOWN;
|
|
|
|
KASSERTMSG( topdown || hint >= orig_hint,
|
|
"map=%p hint=%#"PRIxVADDR" orig_hint=%#"PRIxVADDR
|
|
" length=%#"PRIxVSIZE" uobj=%p uoffset=%#llx align=%"PRIxVSIZE
|
|
" flags=%#x entry=%p (uvm_map_findspace line %d)",
|
|
map, hint, orig_hint,
|
|
length, uobj, (unsigned long long)uoffset, align,
|
|
flags, entry, line);
|
|
#ifndef __sh3__ /* XXXRO: kern/51254 */
|
|
KASSERTMSG(!topdown || hint <= orig_hint,
|
|
#else
|
|
if (__predict_false(!(!topdown || hint <= orig_hint)))
|
|
printf(
|
|
#endif
|
|
"map=%p hint=%#"PRIxVADDR" orig_hint=%#"PRIxVADDR
|
|
" length=%#"PRIxVSIZE" uobj=%p uoffset=%#llx align=%"PRIxVSIZE
|
|
" flags=%#x entry=%p (uvm_map_findspace line %d)",
|
|
map, hint, orig_hint,
|
|
length, uobj, (unsigned long long)uoffset, align,
|
|
flags, entry, line);
|
|
}
|
|
|
|
/*
|
|
* uvm_map_findspace: find "length" sized space in "map".
|
|
*
|
|
* => "hint" is a hint about where we want it, unless UVM_FLAG_FIXED is
|
|
* set in "flags" (in which case we insist on using "hint").
|
|
* => "result" is VA returned
|
|
* => uobj/uoffset are to be used to handle VAC alignment, if required
|
|
* => if "align" is non-zero, we attempt to align to that value.
|
|
* => caller must at least have read-locked map
|
|
* => returns NULL on failure, or pointer to prev. map entry if success
|
|
* => note this is a cross between the old vm_map_findspace and vm_map_find
|
|
*/
|
|
|
|
struct vm_map_entry *
|
|
uvm_map_findspace(struct vm_map *map, vaddr_t hint, vsize_t length,
|
|
vaddr_t *result /* OUT */, struct uvm_object *uobj, voff_t uoffset,
|
|
vsize_t align, int flags)
|
|
{
|
|
#define INVARIANTS() \
|
|
uvm_findspace_invariants(map, orig_hint, length, uobj, uoffset, align,\
|
|
flags, hint, entry, __LINE__)
|
|
struct vm_map_entry *entry = NULL;
|
|
struct vm_map_entry *child, *prev, *tmp;
|
|
vaddr_t orig_hint __diagused;
|
|
const int topdown = map->flags & VM_MAP_TOPDOWN;
|
|
int avail;
|
|
UVMHIST_FUNC(__func__);
|
|
UVMHIST_CALLARGS(maphist, "(map=%#jx, hint=%#jx, len=%ju, flags=%#jx...",
|
|
(uintptr_t)map, hint, length, flags);
|
|
UVMHIST_LOG(maphist, " uobj=%#jx, uoffset=%#jx, align=%#jx)",
|
|
(uintptr_t)uobj, uoffset, align, 0);
|
|
|
|
KASSERT((flags & UVM_FLAG_COLORMATCH) != 0 || powerof2(align));
|
|
KASSERT((flags & UVM_FLAG_COLORMATCH) == 0 || align < uvmexp.ncolors);
|
|
KASSERT((flags & UVM_FLAG_FIXED) == 0 || align == 0);
|
|
|
|
uvm_map_check(map, "map_findspace entry");
|
|
|
|
/*
|
|
* Clamp the hint to the VM map's min/max address, and remmeber
|
|
* the clamped original hint. Remember the original hint,
|
|
* clamped to the min/max address. If we are aligning, then we
|
|
* may have to try again with no alignment constraint if we
|
|
* fail the first time.
|
|
*
|
|
* We use the original hint to verify later that the search has
|
|
* been monotonic -- that is, nonincreasing or nondecreasing,
|
|
* according to topdown or !topdown respectively. But the
|
|
* clamping is not monotonic.
|
|
*/
|
|
if (hint < vm_map_min(map)) { /* check ranges ... */
|
|
if (flags & UVM_FLAG_FIXED) {
|
|
UVMHIST_LOG(maphist,"<- VA below map range",0,0,0,0);
|
|
return (NULL);
|
|
}
|
|
hint = vm_map_min(map);
|
|
}
|
|
if (hint > vm_map_max(map)) {
|
|
UVMHIST_LOG(maphist,"<- VA %#jx > range [%#jx->%#jx]",
|
|
hint, vm_map_min(map), vm_map_max(map), 0);
|
|
return (NULL);
|
|
}
|
|
orig_hint = hint;
|
|
INVARIANTS();
|
|
|
|
UVMHIST_LOG(maphist,"<- VA %#jx vs range [%#jx->%#jx]",
|
|
hint, vm_map_min(map), vm_map_max(map), 0);
|
|
|
|
/*
|
|
* hint may not be aligned properly; we need round up or down it
|
|
* before proceeding further.
|
|
*/
|
|
if ((flags & UVM_FLAG_COLORMATCH) == 0) {
|
|
uvm_map_align_va(&hint, align, topdown);
|
|
INVARIANTS();
|
|
}
|
|
|
|
UVMHIST_LOG(maphist,"<- VA %#jx vs range [%#jx->%#jx]",
|
|
hint, vm_map_min(map), vm_map_max(map), 0);
|
|
/*
|
|
* Look for the first possible address; if there's already
|
|
* something at this address, we have to start after it.
|
|
*/
|
|
|
|
/*
|
|
* @@@: there are four, no, eight cases to consider.
|
|
*
|
|
* 0: found, fixed, bottom up -> fail
|
|
* 1: found, fixed, top down -> fail
|
|
* 2: found, not fixed, bottom up -> start after entry->end,
|
|
* loop up
|
|
* 3: found, not fixed, top down -> start before entry->start,
|
|
* loop down
|
|
* 4: not found, fixed, bottom up -> check entry->next->start, fail
|
|
* 5: not found, fixed, top down -> check entry->next->start, fail
|
|
* 6: not found, not fixed, bottom up -> check entry->next->start,
|
|
* loop up
|
|
* 7: not found, not fixed, top down -> check entry->next->start,
|
|
* loop down
|
|
*
|
|
* as you can see, it reduces to roughly five cases, and that
|
|
* adding top down mapping only adds one unique case (without
|
|
* it, there would be four cases).
|
|
*/
|
|
|
|
if ((flags & UVM_FLAG_FIXED) == 0 &&
|
|
hint == (topdown ? vm_map_max(map) : vm_map_min(map))) {
|
|
/*
|
|
* The uvm_map_findspace algorithm is monotonic -- for
|
|
* topdown VM it starts with a high hint and returns a
|
|
* lower free address; for !topdown VM it starts with a
|
|
* low hint and returns a higher free address. As an
|
|
* optimization, start with the first (highest for
|
|
* topdown, lowest for !topdown) free address.
|
|
*
|
|
* XXX This `optimization' probably doesn't actually do
|
|
* much in practice unless userland explicitly passes
|
|
* the VM map's minimum or maximum address, which
|
|
* varies from machine to machine (VM_MAX/MIN_ADDRESS,
|
|
* e.g. 0x7fbfdfeff000 on amd64 but 0xfffffffff000 on
|
|
* aarch64) and may vary according to other factors
|
|
* like sysctl vm.user_va0_disable. In particular, if
|
|
* the user specifies 0 as a hint to mmap, then mmap
|
|
* will choose a default address which is usually _not_
|
|
* VM_MAX/MIN_ADDRESS but something else instead like
|
|
* VM_MAX_ADDRESS - stack size - guard page overhead,
|
|
* in which case this branch is never hit.
|
|
*
|
|
* In fact, this branch appears to have been broken for
|
|
* two decades between when topdown was introduced in
|
|
* ~2003 and when it was adapted to handle the topdown
|
|
* case without violating the monotonicity assertion in
|
|
* 2022. Maybe Someone^TM should either ditch the
|
|
* optimization or find a better way to do it.
|
|
*/
|
|
entry = map->first_free;
|
|
} else {
|
|
if (uvm_map_lookup_entry(map, hint, &entry)) {
|
|
/* "hint" address already in use ... */
|
|
if (flags & UVM_FLAG_FIXED) {
|
|
UVMHIST_LOG(maphist, "<- fixed & VA in use",
|
|
0, 0, 0, 0);
|
|
return (NULL);
|
|
}
|
|
if (topdown)
|
|
/* Start from lower gap. */
|
|
entry = entry->prev;
|
|
} else if (flags & UVM_FLAG_FIXED) {
|
|
if (entry->next->start >= hint + length &&
|
|
hint + length > hint)
|
|
goto found;
|
|
|
|
/* "hint" address is gap but too small */
|
|
UVMHIST_LOG(maphist, "<- fixed mapping failed",
|
|
0, 0, 0, 0);
|
|
return (NULL); /* only one shot at it ... */
|
|
} else {
|
|
/*
|
|
* See if given hint fits in this gap.
|
|
*/
|
|
avail = uvm_map_space_avail(&hint, length,
|
|
uoffset, align, flags, topdown, entry);
|
|
INVARIANTS();
|
|
switch (avail) {
|
|
case 1:
|
|
goto found;
|
|
case -1:
|
|
goto wraparound;
|
|
}
|
|
|
|
if (topdown) {
|
|
/*
|
|
* Still there is a chance to fit
|
|
* if hint > entry->end.
|
|
*/
|
|
} else {
|
|
/* Start from higher gap. */
|
|
entry = entry->next;
|
|
if (entry == &map->header)
|
|
goto notfound;
|
|
goto nextgap;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Note that all UVM_FLAGS_FIXED case is already handled.
|
|
*/
|
|
KDASSERT((flags & UVM_FLAG_FIXED) == 0);
|
|
|
|
/* Try to find the space in the red-black tree */
|
|
|
|
/* Check slot before any entry */
|
|
if (topdown) {
|
|
KASSERTMSG(entry->next->start >= vm_map_min(map),
|
|
"map=%p entry=%p entry->next=%p"
|
|
" entry->next->start=0x%"PRIxVADDR" min=0x%"PRIxVADDR,
|
|
map, entry, entry->next,
|
|
entry->next->start, vm_map_min(map));
|
|
if (length > entry->next->start - vm_map_min(map))
|
|
hint = vm_map_min(map); /* XXX goto wraparound? */
|
|
else
|
|
hint = entry->next->start - length;
|
|
KASSERT(hint >= vm_map_min(map));
|
|
} else {
|
|
hint = entry->end;
|
|
}
|
|
INVARIANTS();
|
|
avail = uvm_map_space_avail(&hint, length, uoffset, align, flags,
|
|
topdown, entry);
|
|
INVARIANTS();
|
|
switch (avail) {
|
|
case 1:
|
|
goto found;
|
|
case -1:
|
|
goto wraparound;
|
|
}
|
|
|
|
nextgap:
|
|
KDASSERT((flags & UVM_FLAG_FIXED) == 0);
|
|
/* If there is not enough space in the whole tree, we fail */
|
|
tmp = ROOT_ENTRY(map);
|
|
if (tmp == NULL || tmp->maxgap < length)
|
|
goto notfound;
|
|
|
|
prev = NULL; /* previous candidate */
|
|
|
|
/* Find an entry close to hint that has enough space */
|
|
for (; tmp;) {
|
|
KASSERT(tmp->next->start == tmp->end + tmp->gap);
|
|
if (topdown) {
|
|
if (tmp->next->start < hint + length &&
|
|
(prev == NULL || tmp->end > prev->end)) {
|
|
if (tmp->gap >= length)
|
|
prev = tmp;
|
|
else if ((child = LEFT_ENTRY(tmp)) != NULL
|
|
&& child->maxgap >= length)
|
|
prev = tmp;
|
|
}
|
|
} else {
|
|
if (tmp->end >= hint &&
|
|
(prev == NULL || tmp->end < prev->end)) {
|
|
if (tmp->gap >= length)
|
|
prev = tmp;
|
|
else if ((child = RIGHT_ENTRY(tmp)) != NULL
|
|
&& child->maxgap >= length)
|
|
prev = tmp;
|
|
}
|
|
}
|
|
if (tmp->next->start < hint + length)
|
|
child = RIGHT_ENTRY(tmp);
|
|
else if (tmp->end > hint)
|
|
child = LEFT_ENTRY(tmp);
|
|
else {
|
|
if (tmp->gap >= length)
|
|
break;
|
|
if (topdown)
|
|
child = LEFT_ENTRY(tmp);
|
|
else
|
|
child = RIGHT_ENTRY(tmp);
|
|
}
|
|
if (child == NULL || child->maxgap < length)
|
|
break;
|
|
tmp = child;
|
|
}
|
|
|
|
if (tmp != NULL && tmp->start < hint && hint < tmp->next->start) {
|
|
/*
|
|
* Check if the entry that we found satifies the
|
|
* space requirement
|
|
*/
|
|
if (topdown) {
|
|
if (hint > tmp->next->start - length)
|
|
hint = tmp->next->start - length;
|
|
} else {
|
|
if (hint < tmp->end)
|
|
hint = tmp->end;
|
|
}
|
|
INVARIANTS();
|
|
avail = uvm_map_space_avail(&hint, length, uoffset, align,
|
|
flags, topdown, tmp);
|
|
INVARIANTS();
|
|
switch (avail) {
|
|
case 1:
|
|
entry = tmp;
|
|
goto found;
|
|
case -1:
|
|
goto wraparound;
|
|
}
|
|
if (tmp->gap >= length)
|
|
goto listsearch;
|
|
}
|
|
if (prev == NULL)
|
|
goto notfound;
|
|
|
|
if (topdown) {
|
|
KASSERT(orig_hint >= prev->next->start - length ||
|
|
prev->next->start - length > prev->next->start);
|
|
hint = prev->next->start - length;
|
|
} else {
|
|
KASSERT(orig_hint <= prev->end);
|
|
hint = prev->end;
|
|
}
|
|
INVARIANTS();
|
|
avail = uvm_map_space_avail(&hint, length, uoffset, align,
|
|
flags, topdown, prev);
|
|
INVARIANTS();
|
|
switch (avail) {
|
|
case 1:
|
|
entry = prev;
|
|
goto found;
|
|
case -1:
|
|
goto wraparound;
|
|
}
|
|
if (prev->gap >= length)
|
|
goto listsearch;
|
|
|
|
if (topdown)
|
|
tmp = LEFT_ENTRY(prev);
|
|
else
|
|
tmp = RIGHT_ENTRY(prev);
|
|
for (;;) {
|
|
KASSERT(tmp);
|
|
KASSERTMSG(tmp->maxgap >= length,
|
|
"tmp->maxgap=0x%"PRIxVSIZE" length=0x%"PRIxVSIZE,
|
|
tmp->maxgap, length);
|
|
if (topdown)
|
|
child = RIGHT_ENTRY(tmp);
|
|
else
|
|
child = LEFT_ENTRY(tmp);
|
|
if (child && child->maxgap >= length) {
|
|
tmp = child;
|
|
continue;
|
|
}
|
|
if (tmp->gap >= length)
|
|
break;
|
|
if (topdown)
|
|
tmp = LEFT_ENTRY(tmp);
|
|
else
|
|
tmp = RIGHT_ENTRY(tmp);
|
|
}
|
|
|
|
if (topdown) {
|
|
KASSERT(orig_hint >= tmp->next->start - length ||
|
|
tmp->next->start - length > tmp->next->start);
|
|
hint = tmp->next->start - length;
|
|
} else {
|
|
KASSERT(orig_hint <= tmp->end);
|
|
hint = tmp->end;
|
|
}
|
|
INVARIANTS();
|
|
avail = uvm_map_space_avail(&hint, length, uoffset, align,
|
|
flags, topdown, tmp);
|
|
INVARIANTS();
|
|
switch (avail) {
|
|
case 1:
|
|
entry = tmp;
|
|
goto found;
|
|
case -1:
|
|
goto wraparound;
|
|
}
|
|
|
|
/*
|
|
* The tree fails to find an entry because of offset or alignment
|
|
* restrictions. Search the list instead.
|
|
*/
|
|
listsearch:
|
|
/*
|
|
* Look through the rest of the map, trying to fit a new region in
|
|
* the gap between existing regions, or after the very last region.
|
|
* note: entry->end = base VA of current gap,
|
|
* entry->next->start = VA of end of current gap
|
|
*/
|
|
|
|
INVARIANTS();
|
|
for (;;) {
|
|
/* Update hint for current gap. */
|
|
hint = topdown ? entry->next->start - length : entry->end;
|
|
INVARIANTS();
|
|
|
|
/* See if it fits. */
|
|
avail = uvm_map_space_avail(&hint, length, uoffset, align,
|
|
flags, topdown, entry);
|
|
INVARIANTS();
|
|
switch (avail) {
|
|
case 1:
|
|
goto found;
|
|
case -1:
|
|
goto wraparound;
|
|
}
|
|
|
|
/* Advance to next/previous gap */
|
|
if (topdown) {
|
|
if (entry == &map->header) {
|
|
UVMHIST_LOG(maphist, "<- failed (off start)",
|
|
0,0,0,0);
|
|
goto notfound;
|
|
}
|
|
entry = entry->prev;
|
|
} else {
|
|
entry = entry->next;
|
|
if (entry == &map->header) {
|
|
UVMHIST_LOG(maphist, "<- failed (off end)",
|
|
0,0,0,0);
|
|
goto notfound;
|
|
}
|
|
}
|
|
}
|
|
|
|
found:
|
|
SAVE_HINT(map, map->hint, entry);
|
|
*result = hint;
|
|
UVMHIST_LOG(maphist,"<- got it! (result=%#jx)", hint, 0,0,0);
|
|
INVARIANTS();
|
|
KASSERT(entry->end <= hint);
|
|
KASSERT(hint + length <= entry->next->start);
|
|
return (entry);
|
|
|
|
wraparound:
|
|
UVMHIST_LOG(maphist, "<- failed (wrap around)", 0,0,0,0);
|
|
|
|
return (NULL);
|
|
|
|
notfound:
|
|
UVMHIST_LOG(maphist, "<- failed (notfound)", 0,0,0,0);
|
|
|
|
return (NULL);
|
|
#undef INVARIANTS
|
|
}
|
|
|
|
/*
|
|
* U N M A P - m a i n h e l p e r f u n c t i o n s
|
|
*/
|
|
|
|
/*
|
|
* uvm_unmap_remove: remove mappings from a vm_map (from "start" up to "stop")
|
|
*
|
|
* => caller must check alignment and size
|
|
* => map must be locked by caller
|
|
* => we return a list of map entries that we've remove from the map
|
|
* in "entry_list"
|
|
*/
|
|
|
|
void
|
|
uvm_unmap_remove(struct vm_map *map, vaddr_t start, vaddr_t end,
|
|
struct vm_map_entry **entry_list /* OUT */, int flags)
|
|
{
|
|
struct vm_map_entry *entry, *first_entry, *next;
|
|
vaddr_t len;
|
|
UVMHIST_FUNC(__func__);
|
|
UVMHIST_CALLARGS(maphist,"(map=%#jx, start=%#jx, end=%#jx)",
|
|
(uintptr_t)map, start, end, 0);
|
|
VM_MAP_RANGE_CHECK(map, start, end);
|
|
|
|
uvm_map_check(map, "unmap_remove entry");
|
|
|
|
/*
|
|
* find first entry
|
|
*/
|
|
|
|
if (uvm_map_lookup_entry(map, start, &first_entry) == true) {
|
|
/* clip and go... */
|
|
entry = first_entry;
|
|
UVM_MAP_CLIP_START(map, entry, start);
|
|
/* critical! prevents stale hint */
|
|
SAVE_HINT(map, entry, entry->prev);
|
|
} else {
|
|
entry = first_entry->next;
|
|
}
|
|
|
|
/*
|
|
* save the free space hint
|
|
*/
|
|
|
|
if (map->first_free != &map->header && map->first_free->start >= start)
|
|
map->first_free = entry->prev;
|
|
|
|
/*
|
|
* note: we now re-use first_entry for a different task. we remove
|
|
* a number of map entries from the map and save them in a linked
|
|
* list headed by "first_entry". once we remove them from the map
|
|
* the caller should unlock the map and drop the references to the
|
|
* backing objects [c.f. uvm_unmap_detach]. the object is to
|
|
* separate unmapping from reference dropping. why?
|
|
* [1] the map has to be locked for unmapping
|
|
* [2] the map need not be locked for reference dropping
|
|
* [3] dropping references may trigger pager I/O, and if we hit
|
|
* a pager that does synchronous I/O we may have to wait for it.
|
|
* [4] we would like all waiting for I/O to occur with maps unlocked
|
|
* so that we don't block other threads.
|
|
*/
|
|
|
|
first_entry = NULL;
|
|
*entry_list = NULL;
|
|
|
|
/*
|
|
* break up the area into map entry sized regions and unmap. note
|
|
* that all mappings have to be removed before we can even consider
|
|
* dropping references to amaps or VM objects (otherwise we could end
|
|
* up with a mapping to a page on the free list which would be very bad)
|
|
*/
|
|
|
|
while ((entry != &map->header) && (entry->start < end)) {
|
|
KASSERT((entry->flags & UVM_MAP_STATIC) == 0);
|
|
|
|
UVM_MAP_CLIP_END(map, entry, end);
|
|
next = entry->next;
|
|
len = entry->end - entry->start;
|
|
|
|
/*
|
|
* unwire before removing addresses from the pmap; otherwise
|
|
* unwiring will put the entries back into the pmap (XXX).
|
|
*/
|
|
|
|
if (VM_MAPENT_ISWIRED(entry)) {
|
|
uvm_map_entry_unwire(map, entry);
|
|
}
|
|
if (flags & UVM_FLAG_VAONLY) {
|
|
|
|
/* nothing */
|
|
|
|
} else if ((map->flags & VM_MAP_PAGEABLE) == 0) {
|
|
|
|
/*
|
|
* if the map is non-pageable, any pages mapped there
|
|
* must be wired and entered with pmap_kenter_pa(),
|
|
* and we should free any such pages immediately.
|
|
* this is mostly used for kmem_map.
|
|
*/
|
|
KASSERT(vm_map_pmap(map) == pmap_kernel());
|
|
|
|
uvm_km_pgremove_intrsafe(map, entry->start, entry->end);
|
|
} else if (UVM_ET_ISOBJ(entry) &&
|
|
UVM_OBJ_IS_KERN_OBJECT(entry->object.uvm_obj)) {
|
|
panic("%s: kernel object %p %p\n",
|
|
__func__, map, entry);
|
|
} else if (UVM_ET_ISOBJ(entry) || entry->aref.ar_amap) {
|
|
/*
|
|
* remove mappings the standard way. lock object
|
|
* and/or amap to ensure vm_page state does not
|
|
* change while in pmap_remove().
|
|
*/
|
|
|
|
#ifdef __HAVE_UNLOCKED_PMAP /* XXX temporary */
|
|
uvm_map_lock_entry(entry, RW_WRITER);
|
|
#else
|
|
uvm_map_lock_entry(entry, RW_READER);
|
|
#endif
|
|
pmap_remove(map->pmap, entry->start, entry->end);
|
|
|
|
/*
|
|
* note: if map is dying, leave pmap_update() for
|
|
* later. if the map is to be reused (exec) then
|
|
* pmap_update() will be called. if the map is
|
|
* being disposed of (exit) then pmap_destroy()
|
|
* will be called.
|
|
*/
|
|
|
|
if ((map->flags & VM_MAP_DYING) == 0) {
|
|
pmap_update(vm_map_pmap(map));
|
|
} else {
|
|
KASSERT(vm_map_pmap(map) != pmap_kernel());
|
|
}
|
|
|
|
uvm_map_unlock_entry(entry);
|
|
}
|
|
|
|
#if defined(UVMDEBUG)
|
|
/*
|
|
* check if there's remaining mapping,
|
|
* which is a bug in caller.
|
|
*/
|
|
|
|
vaddr_t va;
|
|
for (va = entry->start; va < entry->end;
|
|
va += PAGE_SIZE) {
|
|
if (pmap_extract(vm_map_pmap(map), va, NULL)) {
|
|
panic("%s: %#"PRIxVADDR" has mapping",
|
|
__func__, va);
|
|
}
|
|
}
|
|
|
|
if (VM_MAP_IS_KERNEL(map) && (flags & UVM_FLAG_NOWAIT) == 0) {
|
|
uvm_km_check_empty(map, entry->start, entry->end);
|
|
}
|
|
#endif /* defined(UVMDEBUG) */
|
|
|
|
/*
|
|
* remove entry from map and put it on our list of entries
|
|
* that we've nuked. then go to next entry.
|
|
*/
|
|
|
|
UVMHIST_LOG(maphist, " removed map entry %#jx",
|
|
(uintptr_t)entry, 0, 0, 0);
|
|
|
|
/* critical! prevents stale hint */
|
|
SAVE_HINT(map, entry, entry->prev);
|
|
|
|
uvm_map_entry_unlink(map, entry);
|
|
KASSERT(map->size >= len);
|
|
map->size -= len;
|
|
entry->prev = NULL;
|
|
entry->next = first_entry;
|
|
first_entry = entry;
|
|
entry = next;
|
|
}
|
|
|
|
uvm_map_check(map, "unmap_remove leave");
|
|
|
|
/*
|
|
* now we've cleaned up the map and are ready for the caller to drop
|
|
* references to the mapped objects.
|
|
*/
|
|
|
|
*entry_list = first_entry;
|
|
UVMHIST_LOG(maphist,"<- done!", 0, 0, 0, 0);
|
|
|
|
if (map->flags & VM_MAP_WANTVA) {
|
|
mutex_enter(&map->misc_lock);
|
|
map->flags &= ~VM_MAP_WANTVA;
|
|
cv_broadcast(&map->cv);
|
|
mutex_exit(&map->misc_lock);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* uvm_unmap_detach: drop references in a chain of map entries
|
|
*
|
|
* => we will free the map entries as we traverse the list.
|
|
*/
|
|
|
|
void
|
|
uvm_unmap_detach(struct vm_map_entry *first_entry, int flags)
|
|
{
|
|
struct vm_map_entry *next_entry;
|
|
UVMHIST_FUNC(__func__); UVMHIST_CALLED(maphist);
|
|
|
|
while (first_entry) {
|
|
KASSERT(!VM_MAPENT_ISWIRED(first_entry));
|
|
UVMHIST_LOG(maphist,
|
|
" detach %#jx: amap=%#jx, obj=%#jx, submap?=%jd",
|
|
(uintptr_t)first_entry,
|
|
(uintptr_t)first_entry->aref.ar_amap,
|
|
(uintptr_t)first_entry->object.uvm_obj,
|
|
UVM_ET_ISSUBMAP(first_entry));
|
|
|
|
/*
|
|
* drop reference to amap, if we've got one
|
|
*/
|
|
|
|
if (first_entry->aref.ar_amap)
|
|
uvm_map_unreference_amap(first_entry, flags);
|
|
|
|
/*
|
|
* drop reference to our backing object, if we've got one
|
|
*/
|
|
|
|
KASSERT(!UVM_ET_ISSUBMAP(first_entry));
|
|
if (UVM_ET_ISOBJ(first_entry) &&
|
|
first_entry->object.uvm_obj->pgops->pgo_detach) {
|
|
(*first_entry->object.uvm_obj->pgops->pgo_detach)
|
|
(first_entry->object.uvm_obj);
|
|
}
|
|
next_entry = first_entry->next;
|
|
uvm_mapent_free(first_entry);
|
|
first_entry = next_entry;
|
|
}
|
|
UVMHIST_LOG(maphist, "<- done", 0,0,0,0);
|
|
}
|
|
|
|
/*
|
|
* E X T R A C T I O N F U N C T I O N S
|
|
*/
|
|
|
|
/*
|
|
* uvm_map_reserve: reserve space in a vm_map for future use.
|
|
*
|
|
* => we reserve space in a map by putting a dummy map entry in the
|
|
* map (dummy means obj=NULL, amap=NULL, prot=VM_PROT_NONE)
|
|
* => map should be unlocked (we will write lock it)
|
|
* => we return true if we were able to reserve space
|
|
* => XXXCDC: should be inline?
|
|
*/
|
|
|
|
int
|
|
uvm_map_reserve(struct vm_map *map, vsize_t size,
|
|
vaddr_t offset /* hint for pmap_prefer */,
|
|
vsize_t align /* alignment */,
|
|
vaddr_t *raddr /* IN:hint, OUT: reserved VA */,
|
|
uvm_flag_t flags /* UVM_FLAG_FIXED or UVM_FLAG_COLORMATCH or 0 */)
|
|
{
|
|
UVMHIST_FUNC(__func__);
|
|
UVMHIST_CALLARGS(maphist, "(map=%#jx, size=%#jx, offset=%#jx, addr=%#jx)",
|
|
(uintptr_t)map, size, offset, (uintptr_t)raddr);
|
|
|
|
size = round_page(size);
|
|
|
|
/*
|
|
* reserve some virtual space.
|
|
*/
|
|
|
|
if (uvm_map(map, raddr, size, NULL, offset, align,
|
|
UVM_MAPFLAG(UVM_PROT_NONE, UVM_PROT_NONE, UVM_INH_NONE,
|
|
UVM_ADV_RANDOM, UVM_FLAG_NOMERGE|flags)) != 0) {
|
|
UVMHIST_LOG(maphist, "<- done (no VM)", 0,0,0,0);
|
|
return (false);
|
|
}
|
|
|
|
UVMHIST_LOG(maphist, "<- done (*raddr=%#jx)", *raddr,0,0,0);
|
|
return (true);
|
|
}
|
|
|
|
/*
|
|
* uvm_map_replace: replace a reserved (blank) area of memory with
|
|
* real mappings.
|
|
*
|
|
* => caller must WRITE-LOCK the map
|
|
* => we return true if replacement was a success
|
|
* => we expect the newents chain to have nnewents entrys on it and
|
|
* we expect newents->prev to point to the last entry on the list
|
|
* => note newents is allowed to be NULL
|
|
*/
|
|
|
|
static int
|
|
uvm_map_replace(struct vm_map *map, vaddr_t start, vaddr_t end,
|
|
struct vm_map_entry *newents, int nnewents, vsize_t nsize,
|
|
struct vm_map_entry **oldentryp)
|
|
{
|
|
struct vm_map_entry *oldent, *last;
|
|
|
|
uvm_map_check(map, "map_replace entry");
|
|
|
|
/*
|
|
* first find the blank map entry at the specified address
|
|
*/
|
|
|
|
if (!uvm_map_lookup_entry(map, start, &oldent)) {
|
|
return (false);
|
|
}
|
|
|
|
/*
|
|
* check to make sure we have a proper blank entry
|
|
*/
|
|
|
|
if (end < oldent->end) {
|
|
UVM_MAP_CLIP_END(map, oldent, end);
|
|
}
|
|
if (oldent->start != start || oldent->end != end ||
|
|
oldent->object.uvm_obj != NULL || oldent->aref.ar_amap != NULL) {
|
|
return (false);
|
|
}
|
|
|
|
#ifdef DIAGNOSTIC
|
|
|
|
/*
|
|
* sanity check the newents chain
|
|
*/
|
|
|
|
{
|
|
struct vm_map_entry *tmpent = newents;
|
|
int nent = 0;
|
|
vsize_t sz = 0;
|
|
vaddr_t cur = start;
|
|
|
|
while (tmpent) {
|
|
nent++;
|
|
sz += tmpent->end - tmpent->start;
|
|
if (tmpent->start < cur)
|
|
panic("uvm_map_replace1");
|
|
if (tmpent->start >= tmpent->end || tmpent->end > end) {
|
|
panic("uvm_map_replace2: "
|
|
"tmpent->start=%#"PRIxVADDR
|
|
", tmpent->end=%#"PRIxVADDR
|
|
", end=%#"PRIxVADDR,
|
|
tmpent->start, tmpent->end, end);
|
|
}
|
|
cur = tmpent->end;
|
|
if (tmpent->next) {
|
|
if (tmpent->next->prev != tmpent)
|
|
panic("uvm_map_replace3");
|
|
} else {
|
|
if (newents->prev != tmpent)
|
|
panic("uvm_map_replace4");
|
|
}
|
|
tmpent = tmpent->next;
|
|
}
|
|
if (nent != nnewents)
|
|
panic("uvm_map_replace5");
|
|
if (sz != nsize)
|
|
panic("uvm_map_replace6");
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* map entry is a valid blank! replace it. (this does all the
|
|
* work of map entry link/unlink...).
|
|
*/
|
|
|
|
if (newents) {
|
|
last = newents->prev;
|
|
|
|
/* critical: flush stale hints out of map */
|
|
SAVE_HINT(map, map->hint, newents);
|
|
if (map->first_free == oldent)
|
|
map->first_free = last;
|
|
|
|
last->next = oldent->next;
|
|
last->next->prev = last;
|
|
|
|
/* Fix RB tree */
|
|
uvm_rb_remove(map, oldent);
|
|
|
|
newents->prev = oldent->prev;
|
|
newents->prev->next = newents;
|
|
map->nentries = map->nentries + (nnewents - 1);
|
|
|
|
/* Fixup the RB tree */
|
|
{
|
|
int i;
|
|
struct vm_map_entry *tmp;
|
|
|
|
tmp = newents;
|
|
for (i = 0; i < nnewents && tmp; i++) {
|
|
uvm_rb_insert(map, tmp);
|
|
tmp = tmp->next;
|
|
}
|
|
}
|
|
} else {
|
|
/* NULL list of new entries: just remove the old one */
|
|
clear_hints(map, oldent);
|
|
uvm_map_entry_unlink(map, oldent);
|
|
}
|
|
map->size -= end - start - nsize;
|
|
|
|
uvm_map_check(map, "map_replace leave");
|
|
|
|
/*
|
|
* now we can free the old blank entry and return.
|
|
*/
|
|
|
|
*oldentryp = oldent;
|
|
return (true);
|
|
}
|
|
|
|
/*
|
|
* uvm_map_extract: extract a mapping from a map and put it somewhere
|
|
* (maybe removing the old mapping)
|
|
*
|
|
* => maps should be unlocked (we will write lock them)
|
|
* => returns 0 on success, error code otherwise
|
|
* => start must be page aligned
|
|
* => len must be page sized
|
|
* => flags:
|
|
* UVM_EXTRACT_REMOVE: remove mappings from srcmap
|
|
* UVM_EXTRACT_CONTIG: abort if unmapped area (advisory only)
|
|
* UVM_EXTRACT_QREF: for a temporary extraction do quick obj refs
|
|
* UVM_EXTRACT_FIXPROT: set prot to maxprot as we go
|
|
* UVM_EXTRACT_PROT_ALL: set prot to UVM_PROT_ALL as we go
|
|
* >>>NOTE: if you set REMOVE, you are not allowed to use CONTIG or QREF!<<<
|
|
* >>>NOTE: QREF's must be unmapped via the QREF path, thus should only
|
|
* be used from within the kernel in a kernel level map <<<
|
|
*/
|
|
|
|
int
|
|
uvm_map_extract(struct vm_map *srcmap, vaddr_t start, vsize_t len,
|
|
struct vm_map *dstmap, vaddr_t *dstaddrp, int flags)
|
|
{
|
|
vaddr_t dstaddr, end, newend, oldoffset, fudge, orig_fudge;
|
|
struct vm_map_entry *chain, *endchain, *entry, *orig_entry, *newentry,
|
|
*deadentry, *oldentry;
|
|
struct vm_map_entry *resentry = NULL; /* a dummy reservation entry */
|
|
vsize_t elen __unused;
|
|
int nchain, error, copy_ok;
|
|
vsize_t nsize;
|
|
UVMHIST_FUNC(__func__);
|
|
UVMHIST_CALLARGS(maphist,"(srcmap=%#jx,start=%#jx, len=%#jx",
|
|
(uintptr_t)srcmap, start, len, 0);
|
|
UVMHIST_LOG(maphist," ...,dstmap=%#jx, flags=%#jx)",
|
|
(uintptr_t)dstmap, flags, 0, 0);
|
|
|
|
/*
|
|
* step 0: sanity check: start must be on a page boundary, length
|
|
* must be page sized. can't ask for CONTIG/QREF if you asked for
|
|
* REMOVE.
|
|
*/
|
|
|
|
KASSERTMSG((start & PAGE_MASK) == 0, "start=0x%"PRIxVADDR, start);
|
|
KASSERTMSG((len & PAGE_MASK) == 0, "len=0x%"PRIxVADDR, len);
|
|
KASSERT((flags & UVM_EXTRACT_REMOVE) == 0 ||
|
|
(flags & (UVM_EXTRACT_CONTIG|UVM_EXTRACT_QREF)) == 0);
|
|
|
|
/*
|
|
* step 1: reserve space in the target map for the extracted area
|
|
*/
|
|
|
|
if ((flags & UVM_EXTRACT_RESERVED) == 0) {
|
|
dstaddr = vm_map_min(dstmap);
|
|
if (!uvm_map_reserve(dstmap, len, start,
|
|
atop(start) & uvmexp.colormask, &dstaddr,
|
|
UVM_FLAG_COLORMATCH))
|
|
return (ENOMEM);
|
|
KASSERT((atop(start ^ dstaddr) & uvmexp.colormask) == 0);
|
|
*dstaddrp = dstaddr; /* pass address back to caller */
|
|
UVMHIST_LOG(maphist, " dstaddr=%#jx", dstaddr,0,0,0);
|
|
} else {
|
|
dstaddr = *dstaddrp;
|
|
}
|
|
|
|
/*
|
|
* step 2: setup for the extraction process loop by init'ing the
|
|
* map entry chain, locking src map, and looking up the first useful
|
|
* entry in the map.
|
|
*/
|
|
|
|
end = start + len;
|
|
newend = dstaddr + len;
|
|
chain = endchain = NULL;
|
|
nchain = 0;
|
|
nsize = 0;
|
|
vm_map_lock(srcmap);
|
|
|
|
if (uvm_map_lookup_entry(srcmap, start, &entry)) {
|
|
|
|
/* "start" is within an entry */
|
|
if (flags & UVM_EXTRACT_QREF) {
|
|
|
|
/*
|
|
* for quick references we don't clip the entry, so
|
|
* the entry may map space "before" the starting
|
|
* virtual address... this is the "fudge" factor
|
|
* (which can be non-zero only the first time
|
|
* through the "while" loop in step 3).
|
|
*/
|
|
|
|
fudge = start - entry->start;
|
|
} else {
|
|
|
|
/*
|
|
* normal reference: we clip the map to fit (thus
|
|
* fudge is zero)
|
|
*/
|
|
|
|
UVM_MAP_CLIP_START(srcmap, entry, start);
|
|
SAVE_HINT(srcmap, srcmap->hint, entry->prev);
|
|
fudge = 0;
|
|
}
|
|
} else {
|
|
|
|
/* "start" is not within an entry ... skip to next entry */
|
|
if (flags & UVM_EXTRACT_CONTIG) {
|
|
error = EINVAL;
|
|
goto bad; /* definite hole here ... */
|
|
}
|
|
|
|
entry = entry->next;
|
|
fudge = 0;
|
|
}
|
|
|
|
/* save values from srcmap for step 6 */
|
|
orig_entry = entry;
|
|
orig_fudge = fudge;
|
|
|
|
/*
|
|
* step 3: now start looping through the map entries, extracting
|
|
* as we go.
|
|
*/
|
|
|
|
while (entry->start < end && entry != &srcmap->header) {
|
|
|
|
/* if we are not doing a quick reference, clip it */
|
|
if ((flags & UVM_EXTRACT_QREF) == 0)
|
|
UVM_MAP_CLIP_END(srcmap, entry, end);
|
|
|
|
/* clear needs_copy (allow chunking) */
|
|
if (UVM_ET_ISNEEDSCOPY(entry)) {
|
|
amap_copy(srcmap, entry,
|
|
AMAP_COPY_NOWAIT|AMAP_COPY_NOMERGE, start, end);
|
|
if (UVM_ET_ISNEEDSCOPY(entry)) { /* failed? */
|
|
error = ENOMEM;
|
|
goto bad;
|
|
}
|
|
|
|
/* amap_copy could clip (during chunk)! update fudge */
|
|
if (fudge) {
|
|
fudge = start - entry->start;
|
|
orig_fudge = fudge;
|
|
}
|
|
}
|
|
|
|
/* calculate the offset of this from "start" */
|
|
oldoffset = (entry->start + fudge) - start;
|
|
|
|
/* allocate a new map entry */
|
|
newentry = uvm_mapent_alloc(dstmap, 0);
|
|
if (newentry == NULL) {
|
|
error = ENOMEM;
|
|
goto bad;
|
|
}
|
|
|
|
/* set up new map entry */
|
|
newentry->next = NULL;
|
|
newentry->prev = endchain;
|
|
newentry->start = dstaddr + oldoffset;
|
|
newentry->end =
|
|
newentry->start + (entry->end - (entry->start + fudge));
|
|
if (newentry->end > newend || newentry->end < newentry->start)
|
|
newentry->end = newend;
|
|
newentry->object.uvm_obj = entry->object.uvm_obj;
|
|
if (newentry->object.uvm_obj) {
|
|
if (newentry->object.uvm_obj->pgops->pgo_reference)
|
|
newentry->object.uvm_obj->pgops->
|
|
pgo_reference(newentry->object.uvm_obj);
|
|
newentry->offset = entry->offset + fudge;
|
|
} else {
|
|
newentry->offset = 0;
|
|
}
|
|
newentry->etype = entry->etype;
|
|
if (flags & UVM_EXTRACT_PROT_ALL) {
|
|
newentry->protection = newentry->max_protection =
|
|
UVM_PROT_ALL;
|
|
} else {
|
|
newentry->protection = (flags & UVM_EXTRACT_FIXPROT) ?
|
|
entry->max_protection : entry->protection;
|
|
newentry->max_protection = entry->max_protection;
|
|
}
|
|
newentry->inheritance = entry->inheritance;
|
|
newentry->wired_count = 0;
|
|
newentry->aref.ar_amap = entry->aref.ar_amap;
|
|
if (newentry->aref.ar_amap) {
|
|
newentry->aref.ar_pageoff =
|
|
entry->aref.ar_pageoff + (fudge >> PAGE_SHIFT);
|
|
uvm_map_reference_amap(newentry, AMAP_SHARED |
|
|
((flags & UVM_EXTRACT_QREF) ? AMAP_REFALL : 0));
|
|
} else {
|
|
newentry->aref.ar_pageoff = 0;
|
|
}
|
|
newentry->advice = entry->advice;
|
|
if ((flags & UVM_EXTRACT_QREF) != 0) {
|
|
newentry->flags |= UVM_MAP_NOMERGE;
|
|
}
|
|
|
|
/* now link it on the chain */
|
|
nchain++;
|
|
nsize += newentry->end - newentry->start;
|
|
if (endchain == NULL) {
|
|
chain = endchain = newentry;
|
|
} else {
|
|
endchain->next = newentry;
|
|
endchain = newentry;
|
|
}
|
|
|
|
/* end of 'while' loop! */
|
|
if ((flags & UVM_EXTRACT_CONTIG) && entry->end < end &&
|
|
(entry->next == &srcmap->header ||
|
|
entry->next->start != entry->end)) {
|
|
error = EINVAL;
|
|
goto bad;
|
|
}
|
|
entry = entry->next;
|
|
fudge = 0;
|
|
}
|
|
|
|
/*
|
|
* step 4: close off chain (in format expected by uvm_map_replace)
|
|
*/
|
|
|
|
if (chain)
|
|
chain->prev = endchain;
|
|
|
|
/*
|
|
* step 5: attempt to lock the dest map so we can pmap_copy.
|
|
* note usage of copy_ok:
|
|
* 1 => dstmap locked, pmap_copy ok, and we "replace" here (step 5)
|
|
* 0 => dstmap unlocked, NO pmap_copy, and we will "replace" in step 7
|
|
*/
|
|
|
|
if (srcmap == dstmap || vm_map_lock_try(dstmap) == true) {
|
|
copy_ok = 1;
|
|
if (!uvm_map_replace(dstmap, dstaddr, dstaddr+len, chain,
|
|
nchain, nsize, &resentry)) {
|
|
if (srcmap != dstmap)
|
|
vm_map_unlock(dstmap);
|
|
error = EIO;
|
|
goto bad;
|
|
}
|
|
} else {
|
|
copy_ok = 0;
|
|
/* replace deferred until step 7 */
|
|
}
|
|
|
|
/*
|
|
* step 6: traverse the srcmap a second time to do the following:
|
|
* - if we got a lock on the dstmap do pmap_copy
|
|
* - if UVM_EXTRACT_REMOVE remove the entries
|
|
* we make use of orig_entry and orig_fudge (saved in step 2)
|
|
*/
|
|
|
|
if (copy_ok || (flags & UVM_EXTRACT_REMOVE)) {
|
|
|
|
/* purge possible stale hints from srcmap */
|
|
if (flags & UVM_EXTRACT_REMOVE) {
|
|
SAVE_HINT(srcmap, srcmap->hint, orig_entry->prev);
|
|
if (srcmap->first_free != &srcmap->header &&
|
|
srcmap->first_free->start >= start)
|
|
srcmap->first_free = orig_entry->prev;
|
|
}
|
|
|
|
entry = orig_entry;
|
|
fudge = orig_fudge;
|
|
deadentry = NULL; /* for UVM_EXTRACT_REMOVE */
|
|
|
|
while (entry->start < end && entry != &srcmap->header) {
|
|
if (copy_ok) {
|
|
oldoffset = (entry->start + fudge) - start;
|
|
elen = MIN(end, entry->end) -
|
|
(entry->start + fudge);
|
|
pmap_copy(dstmap->pmap, srcmap->pmap,
|
|
dstaddr + oldoffset, elen,
|
|
entry->start + fudge);
|
|
}
|
|
|
|
/* we advance "entry" in the following if statement */
|
|
if (flags & UVM_EXTRACT_REMOVE) {
|
|
#ifdef __HAVE_UNLOCKED_PMAP /* XXX temporary */
|
|
uvm_map_lock_entry(entry, RW_WRITER);
|
|
#else
|
|
uvm_map_lock_entry(entry, RW_READER);
|
|
#endif
|
|
pmap_remove(srcmap->pmap, entry->start,
|
|
entry->end);
|
|
uvm_map_unlock_entry(entry);
|
|
oldentry = entry; /* save entry */
|
|
entry = entry->next; /* advance */
|
|
uvm_map_entry_unlink(srcmap, oldentry);
|
|
/* add to dead list */
|
|
oldentry->next = deadentry;
|
|
deadentry = oldentry;
|
|
} else {
|
|
entry = entry->next; /* advance */
|
|
}
|
|
|
|
/* end of 'while' loop */
|
|
fudge = 0;
|
|
}
|
|
pmap_update(srcmap->pmap);
|
|
|
|
/*
|
|
* unlock dstmap. we will dispose of deadentry in
|
|
* step 7 if needed
|
|
*/
|
|
|
|
if (copy_ok && srcmap != dstmap)
|
|
vm_map_unlock(dstmap);
|
|
|
|
} else {
|
|
deadentry = NULL;
|
|
}
|
|
|
|
/*
|
|
* step 7: we are done with the source map, unlock. if copy_ok
|
|
* is 0 then we have not replaced the dummy mapping in dstmap yet
|
|
* and we need to do so now.
|
|
*/
|
|
|
|
vm_map_unlock(srcmap);
|
|
if ((flags & UVM_EXTRACT_REMOVE) && deadentry)
|
|
uvm_unmap_detach(deadentry, 0); /* dispose of old entries */
|
|
|
|
/* now do the replacement if we didn't do it in step 5 */
|
|
if (copy_ok == 0) {
|
|
vm_map_lock(dstmap);
|
|
error = uvm_map_replace(dstmap, dstaddr, dstaddr+len, chain,
|
|
nchain, nsize, &resentry);
|
|
vm_map_unlock(dstmap);
|
|
|
|
if (error == false) {
|
|
error = EIO;
|
|
goto bad2;
|
|
}
|
|
}
|
|
|
|
if (resentry != NULL)
|
|
uvm_mapent_free(resentry);
|
|
|
|
return (0);
|
|
|
|
/*
|
|
* bad: failure recovery
|
|
*/
|
|
bad:
|
|
vm_map_unlock(srcmap);
|
|
bad2: /* src already unlocked */
|
|
if (chain)
|
|
uvm_unmap_detach(chain,
|
|
(flags & UVM_EXTRACT_QREF) ? AMAP_REFALL : 0);
|
|
|
|
if (resentry != NULL)
|
|
uvm_mapent_free(resentry);
|
|
|
|
if ((flags & UVM_EXTRACT_RESERVED) == 0) {
|
|
uvm_unmap(dstmap, dstaddr, dstaddr+len); /* ??? */
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/* end of extraction functions */
|
|
|
|
/*
|
|
* uvm_map_submap: punch down part of a map into a submap
|
|
*
|
|
* => only the kernel_map is allowed to be submapped
|
|
* => the purpose of submapping is to break up the locking granularity
|
|
* of a larger map
|
|
* => the range specified must have been mapped previously with a uvm_map()
|
|
* call [with uobj==NULL] to create a blank map entry in the main map.
|
|
* [And it had better still be blank!]
|
|
* => maps which contain submaps should never be copied or forked.
|
|
* => to remove a submap, use uvm_unmap() on the main map
|
|
* and then uvm_map_deallocate() the submap.
|
|
* => main map must be unlocked.
|
|
* => submap must have been init'd and have a zero reference count.
|
|
* [need not be locked as we don't actually reference it]
|
|
*/
|
|
|
|
int
|
|
uvm_map_submap(struct vm_map *map, vaddr_t start, vaddr_t end,
|
|
struct vm_map *submap)
|
|
{
|
|
struct vm_map_entry *entry;
|
|
int error;
|
|
|
|
vm_map_lock(map);
|
|
VM_MAP_RANGE_CHECK(map, start, end);
|
|
|
|
if (uvm_map_lookup_entry(map, start, &entry)) {
|
|
UVM_MAP_CLIP_START(map, entry, start);
|
|
UVM_MAP_CLIP_END(map, entry, end); /* to be safe */
|
|
} else {
|
|
entry = NULL;
|
|
}
|
|
|
|
if (entry != NULL &&
|
|
entry->start == start && entry->end == end &&
|
|
entry->object.uvm_obj == NULL && entry->aref.ar_amap == NULL &&
|
|
!UVM_ET_ISCOPYONWRITE(entry) && !UVM_ET_ISNEEDSCOPY(entry)) {
|
|
entry->etype |= UVM_ET_SUBMAP;
|
|
entry->object.sub_map = submap;
|
|
entry->offset = 0;
|
|
uvm_map_reference(submap);
|
|
error = 0;
|
|
} else {
|
|
error = EINVAL;
|
|
}
|
|
vm_map_unlock(map);
|
|
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* uvm_map_protect_user: change map protection on behalf of the user.
|
|
* Enforces PAX settings as necessary.
|
|
*/
|
|
int
|
|
uvm_map_protect_user(struct lwp *l, vaddr_t start, vaddr_t end,
|
|
vm_prot_t new_prot)
|
|
{
|
|
int error;
|
|
|
|
if ((error = PAX_MPROTECT_VALIDATE(l, new_prot)))
|
|
return error;
|
|
|
|
return uvm_map_protect(&l->l_proc->p_vmspace->vm_map, start, end,
|
|
new_prot, false);
|
|
}
|
|
|
|
|
|
/*
|
|
* uvm_map_protect: change map protection
|
|
*
|
|
* => set_max means set max_protection.
|
|
* => map must be unlocked.
|
|
*/
|
|
|
|
#define MASK(entry) (UVM_ET_ISCOPYONWRITE(entry) ? \
|
|
~VM_PROT_WRITE : VM_PROT_ALL)
|
|
|
|
int
|
|
uvm_map_protect(struct vm_map *map, vaddr_t start, vaddr_t end,
|
|
vm_prot_t new_prot, bool set_max)
|
|
{
|
|
struct vm_map_entry *current, *entry;
|
|
int error = 0;
|
|
UVMHIST_FUNC(__func__);
|
|
UVMHIST_CALLARGS(maphist,"(map=%#jx,start=%#jx,end=%#jx,new_prot=%#jx)",
|
|
(uintptr_t)map, start, end, new_prot);
|
|
|
|
vm_map_lock(map);
|
|
VM_MAP_RANGE_CHECK(map, start, end);
|
|
if (uvm_map_lookup_entry(map, start, &entry)) {
|
|
UVM_MAP_CLIP_START(map, entry, start);
|
|
} else {
|
|
entry = entry->next;
|
|
}
|
|
|
|
/*
|
|
* make a first pass to check for protection violations.
|
|
*/
|
|
|
|
current = entry;
|
|
while ((current != &map->header) && (current->start < end)) {
|
|
if (UVM_ET_ISSUBMAP(current)) {
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
if ((new_prot & current->max_protection) != new_prot) {
|
|
error = EACCES;
|
|
goto out;
|
|
}
|
|
/*
|
|
* Don't allow VM_PROT_EXECUTE to be set on entries that
|
|
* point to vnodes that are associated with a NOEXEC file
|
|
* system.
|
|
*/
|
|
if (UVM_ET_ISOBJ(current) &&
|
|
UVM_OBJ_IS_VNODE(current->object.uvm_obj)) {
|
|
struct vnode *vp =
|
|
(struct vnode *) current->object.uvm_obj;
|
|
|
|
if ((new_prot & VM_PROT_EXECUTE) != 0 &&
|
|
(vp->v_mount->mnt_flag & MNT_NOEXEC) != 0) {
|
|
error = EACCES;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
current = current->next;
|
|
}
|
|
|
|
/* go back and fix up protections (no need to clip this time). */
|
|
|
|
current = entry;
|
|
while ((current != &map->header) && (current->start < end)) {
|
|
vm_prot_t old_prot;
|
|
|
|
UVM_MAP_CLIP_END(map, current, end);
|
|
old_prot = current->protection;
|
|
if (set_max)
|
|
current->protection =
|
|
(current->max_protection = new_prot) & old_prot;
|
|
else
|
|
current->protection = new_prot;
|
|
|
|
/*
|
|
* update physical map if necessary. worry about copy-on-write
|
|
* here -- CHECK THIS XXX
|
|
*/
|
|
|
|
if (current->protection != old_prot) {
|
|
/* update pmap! */
|
|
#ifdef __HAVE_UNLOCKED_PMAP /* XXX temporary */
|
|
uvm_map_lock_entry(current, RW_WRITER);
|
|
#else
|
|
uvm_map_lock_entry(current, RW_READER);
|
|
#endif
|
|
pmap_protect(map->pmap, current->start, current->end,
|
|
current->protection & MASK(current));
|
|
uvm_map_unlock_entry(current);
|
|
|
|
/*
|
|
* If this entry points at a vnode, and the
|
|
* protection includes VM_PROT_EXECUTE, mark
|
|
* the vnode as VEXECMAP.
|
|
*/
|
|
if (UVM_ET_ISOBJ(current)) {
|
|
struct uvm_object *uobj =
|
|
current->object.uvm_obj;
|
|
|
|
if (UVM_OBJ_IS_VNODE(uobj) &&
|
|
(current->protection & VM_PROT_EXECUTE)) {
|
|
vn_markexec((struct vnode *) uobj);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If the map is configured to lock any future mappings,
|
|
* wire this entry now if the old protection was VM_PROT_NONE
|
|
* and the new protection is not VM_PROT_NONE.
|
|
*/
|
|
|
|
if ((map->flags & VM_MAP_WIREFUTURE) != 0 &&
|
|
VM_MAPENT_ISWIRED(current) == 0 &&
|
|
old_prot == VM_PROT_NONE &&
|
|
new_prot != VM_PROT_NONE) {
|
|
|
|
/*
|
|
* We must call pmap_update() here because the
|
|
* pmap_protect() call above might have removed some
|
|
* pmap entries and uvm_map_pageable() might create
|
|
* some new pmap entries that rely on the prior
|
|
* removals being completely finished.
|
|
*/
|
|
|
|
pmap_update(map->pmap);
|
|
|
|
if (uvm_map_pageable(map, current->start,
|
|
current->end, false,
|
|
UVM_LK_ENTER|UVM_LK_EXIT) != 0) {
|
|
|
|
/*
|
|
* If locking the entry fails, remember the
|
|
* error if it's the first one. Note we
|
|
* still continue setting the protection in
|
|
* the map, but will return the error
|
|
* condition regardless.
|
|
*
|
|
* XXX Ignore what the actual error is,
|
|
* XXX just call it a resource shortage
|
|
* XXX so that it doesn't get confused
|
|
* XXX what uvm_map_protect() itself would
|
|
* XXX normally return.
|
|
*/
|
|
|
|
error = ENOMEM;
|
|
}
|
|
}
|
|
current = current->next;
|
|
}
|
|
pmap_update(map->pmap);
|
|
|
|
out:
|
|
vm_map_unlock(map);
|
|
|
|
UVMHIST_LOG(maphist, "<- done, error=%jd",error,0,0,0);
|
|
return error;
|
|
}
|
|
|
|
#undef MASK
|
|
|
|
/*
|
|
* uvm_map_inherit: set inheritance code for range of addrs in map.
|
|
*
|
|
* => map must be unlocked
|
|
* => note that the inherit code is used during a "fork". see fork
|
|
* code for details.
|
|
*/
|
|
|
|
int
|
|
uvm_map_inherit(struct vm_map *map, vaddr_t start, vaddr_t end,
|
|
vm_inherit_t new_inheritance)
|
|
{
|
|
struct vm_map_entry *entry, *temp_entry;
|
|
UVMHIST_FUNC(__func__);
|
|
UVMHIST_CALLARGS(maphist,"(map=%#jx,start=%#jx,end=%#jx,new_inh=%#jx)",
|
|
(uintptr_t)map, start, end, new_inheritance);
|
|
|
|
switch (new_inheritance) {
|
|
case MAP_INHERIT_NONE:
|
|
case MAP_INHERIT_COPY:
|
|
case MAP_INHERIT_SHARE:
|
|
case MAP_INHERIT_ZERO:
|
|
break;
|
|
default:
|
|
UVMHIST_LOG(maphist,"<- done (INVALID ARG)",0,0,0,0);
|
|
return EINVAL;
|
|
}
|
|
|
|
vm_map_lock(map);
|
|
VM_MAP_RANGE_CHECK(map, start, end);
|
|
if (uvm_map_lookup_entry(map, start, &temp_entry)) {
|
|
entry = temp_entry;
|
|
UVM_MAP_CLIP_START(map, entry, start);
|
|
} else {
|
|
entry = temp_entry->next;
|
|
}
|
|
while ((entry != &map->header) && (entry->start < end)) {
|
|
UVM_MAP_CLIP_END(map, entry, end);
|
|
entry->inheritance = new_inheritance;
|
|
entry = entry->next;
|
|
}
|
|
vm_map_unlock(map);
|
|
UVMHIST_LOG(maphist,"<- done (OK)",0,0,0,0);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* uvm_map_advice: set advice code for range of addrs in map.
|
|
*
|
|
* => map must be unlocked
|
|
*/
|
|
|
|
int
|
|
uvm_map_advice(struct vm_map *map, vaddr_t start, vaddr_t end, int new_advice)
|
|
{
|
|
struct vm_map_entry *entry, *temp_entry;
|
|
UVMHIST_FUNC(__func__);
|
|
UVMHIST_CALLARGS(maphist,"(map=%#jx,start=%#jx,end=%#jx,new_adv=%#jx)",
|
|
(uintptr_t)map, start, end, new_advice);
|
|
|
|
vm_map_lock(map);
|
|
VM_MAP_RANGE_CHECK(map, start, end);
|
|
if (uvm_map_lookup_entry(map, start, &temp_entry)) {
|
|
entry = temp_entry;
|
|
UVM_MAP_CLIP_START(map, entry, start);
|
|
} else {
|
|
entry = temp_entry->next;
|
|
}
|
|
|
|
/*
|
|
* XXXJRT: disallow holes?
|
|
*/
|
|
|
|
while ((entry != &map->header) && (entry->start < end)) {
|
|
UVM_MAP_CLIP_END(map, entry, end);
|
|
|
|
switch (new_advice) {
|
|
case MADV_NORMAL:
|
|
case MADV_RANDOM:
|
|
case MADV_SEQUENTIAL:
|
|
/* nothing special here */
|
|
break;
|
|
|
|
default:
|
|
vm_map_unlock(map);
|
|
UVMHIST_LOG(maphist,"<- done (INVALID ARG)",0,0,0,0);
|
|
return EINVAL;
|
|
}
|
|
entry->advice = new_advice;
|
|
entry = entry->next;
|
|
}
|
|
|
|
vm_map_unlock(map);
|
|
UVMHIST_LOG(maphist,"<- done (OK)",0,0,0,0);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* uvm_map_willneed: apply MADV_WILLNEED
|
|
*/
|
|
|
|
int
|
|
uvm_map_willneed(struct vm_map *map, vaddr_t start, vaddr_t end)
|
|
{
|
|
struct vm_map_entry *entry;
|
|
UVMHIST_FUNC(__func__);
|
|
UVMHIST_CALLARGS(maphist,"(map=%#jx,start=%#jx,end=%#jx)",
|
|
(uintptr_t)map, start, end, 0);
|
|
|
|
vm_map_lock_read(map);
|
|
VM_MAP_RANGE_CHECK(map, start, end);
|
|
if (!uvm_map_lookup_entry(map, start, &entry)) {
|
|
entry = entry->next;
|
|
}
|
|
while (entry->start < end) {
|
|
struct vm_amap * const amap = entry->aref.ar_amap;
|
|
struct uvm_object * const uobj = entry->object.uvm_obj;
|
|
|
|
KASSERT(entry != &map->header);
|
|
KASSERT(start < entry->end);
|
|
/*
|
|
* For now, we handle only the easy but commonly-requested case.
|
|
* ie. start prefetching of backing uobj pages.
|
|
*
|
|
* XXX It might be useful to pmap_enter() the already-in-core
|
|
* pages by inventing a "weak" mode for uvm_fault() which would
|
|
* only do the PGO_LOCKED pgo_get().
|
|
*/
|
|
if (UVM_ET_ISOBJ(entry) && amap == NULL && uobj != NULL) {
|
|
off_t offset;
|
|
off_t size;
|
|
|
|
offset = entry->offset;
|
|
if (start < entry->start) {
|
|
offset += entry->start - start;
|
|
}
|
|
size = entry->offset + (entry->end - entry->start);
|
|
if (entry->end < end) {
|
|
size -= end - entry->end;
|
|
}
|
|
uvm_readahead(uobj, offset, size);
|
|
}
|
|
entry = entry->next;
|
|
}
|
|
vm_map_unlock_read(map);
|
|
UVMHIST_LOG(maphist,"<- done (OK)",0,0,0,0);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* uvm_map_pageable: sets the pageability of a range in a map.
|
|
*
|
|
* => wires map entries. should not be used for transient page locking.
|
|
* for that, use uvm_fault_wire()/uvm_fault_unwire() (see uvm_vslock()).
|
|
* => regions specified as not pageable require lock-down (wired) memory
|
|
* and page tables.
|
|
* => map must never be read-locked
|
|
* => if islocked is true, map is already write-locked
|
|
* => we always unlock the map, since we must downgrade to a read-lock
|
|
* to call uvm_fault_wire()
|
|
* => XXXCDC: check this and try and clean it up.
|
|
*/
|
|
|
|
int
|
|
uvm_map_pageable(struct vm_map *map, vaddr_t start, vaddr_t end,
|
|
bool new_pageable, int lockflags)
|
|
{
|
|
struct vm_map_entry *entry, *start_entry, *failed_entry;
|
|
int rv;
|
|
#ifdef DIAGNOSTIC
|
|
u_int timestamp_save;
|
|
#endif
|
|
UVMHIST_FUNC(__func__);
|
|
UVMHIST_CALLARGS(maphist,"(map=%#jx,start=%#jx,end=%#jx,new_pageable=%ju)",
|
|
(uintptr_t)map, start, end, new_pageable);
|
|
KASSERT(map->flags & VM_MAP_PAGEABLE);
|
|
|
|
if ((lockflags & UVM_LK_ENTER) == 0)
|
|
vm_map_lock(map);
|
|
VM_MAP_RANGE_CHECK(map, start, end);
|
|
|
|
/*
|
|
* only one pageability change may take place at one time, since
|
|
* uvm_fault_wire assumes it will be called only once for each
|
|
* wiring/unwiring. therefore, we have to make sure we're actually
|
|
* changing the pageability for the entire region. we do so before
|
|
* making any changes.
|
|
*/
|
|
|
|
if (uvm_map_lookup_entry(map, start, &start_entry) == false) {
|
|
if ((lockflags & UVM_LK_EXIT) == 0)
|
|
vm_map_unlock(map);
|
|
|
|
UVMHIST_LOG(maphist,"<- done (fault)",0,0,0,0);
|
|
return EFAULT;
|
|
}
|
|
entry = start_entry;
|
|
|
|
if (start == end) { /* nothing required */
|
|
if ((lockflags & UVM_LK_EXIT) == 0)
|
|
vm_map_unlock(map);
|
|
|
|
UVMHIST_LOG(maphist,"<- done (nothing)",0,0,0,0);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* handle wiring and unwiring separately.
|
|
*/
|
|
|
|
if (new_pageable) { /* unwire */
|
|
UVM_MAP_CLIP_START(map, entry, start);
|
|
|
|
/*
|
|
* unwiring. first ensure that the range to be unwired is
|
|
* really wired down and that there are no holes.
|
|
*/
|
|
|
|
while ((entry != &map->header) && (entry->start < end)) {
|
|
if (entry->wired_count == 0 ||
|
|
(entry->end < end &&
|
|
(entry->next == &map->header ||
|
|
entry->next->start > entry->end))) {
|
|
if ((lockflags & UVM_LK_EXIT) == 0)
|
|
vm_map_unlock(map);
|
|
UVMHIST_LOG(maphist, "<- done (INVAL)",0,0,0,0);
|
|
return EINVAL;
|
|
}
|
|
entry = entry->next;
|
|
}
|
|
|
|
/*
|
|
* POSIX 1003.1b - a single munlock call unlocks a region,
|
|
* regardless of the number of mlock calls made on that
|
|
* region.
|
|
*/
|
|
|
|
entry = start_entry;
|
|
while ((entry != &map->header) && (entry->start < end)) {
|
|
UVM_MAP_CLIP_END(map, entry, end);
|
|
if (VM_MAPENT_ISWIRED(entry))
|
|
uvm_map_entry_unwire(map, entry);
|
|
entry = entry->next;
|
|
}
|
|
if ((lockflags & UVM_LK_EXIT) == 0)
|
|
vm_map_unlock(map);
|
|
UVMHIST_LOG(maphist,"<- done (OK UNWIRE)",0,0,0,0);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* wire case: in two passes [XXXCDC: ugly block of code here]
|
|
*
|
|
* 1: holding the write lock, we create any anonymous maps that need
|
|
* to be created. then we clip each map entry to the region to
|
|
* be wired and increment its wiring count.
|
|
*
|
|
* 2: we downgrade to a read lock, and call uvm_fault_wire to fault
|
|
* in the pages for any newly wired area (wired_count == 1).
|
|
*
|
|
* downgrading to a read lock for uvm_fault_wire avoids a possible
|
|
* deadlock with another thread that may have faulted on one of
|
|
* the pages to be wired (it would mark the page busy, blocking
|
|
* us, then in turn block on the map lock that we hold). because
|
|
* of problems in the recursive lock package, we cannot upgrade
|
|
* to a write lock in vm_map_lookup. thus, any actions that
|
|
* require the write lock must be done beforehand. because we
|
|
* keep the read lock on the map, the copy-on-write status of the
|
|
* entries we modify here cannot change.
|
|
*/
|
|
|
|
while ((entry != &map->header) && (entry->start < end)) {
|
|
if (VM_MAPENT_ISWIRED(entry) == 0) { /* not already wired? */
|
|
|
|
/*
|
|
* perform actions of vm_map_lookup that need the
|
|
* write lock on the map: create an anonymous map
|
|
* for a copy-on-write region, or an anonymous map
|
|
* for a zero-fill region. (XXXCDC: submap case
|
|
* ok?)
|
|
*/
|
|
|
|
if (!UVM_ET_ISSUBMAP(entry)) { /* not submap */
|
|
if (UVM_ET_ISNEEDSCOPY(entry) &&
|
|
((entry->max_protection & VM_PROT_WRITE) ||
|
|
(entry->object.uvm_obj == NULL))) {
|
|
amap_copy(map, entry, 0, start, end);
|
|
/* XXXCDC: wait OK? */
|
|
}
|
|
}
|
|
}
|
|
UVM_MAP_CLIP_START(map, entry, start);
|
|
UVM_MAP_CLIP_END(map, entry, end);
|
|
entry->wired_count++;
|
|
|
|
/*
|
|
* Check for holes
|
|
*/
|
|
|
|
if (entry->protection == VM_PROT_NONE ||
|
|
(entry->end < end &&
|
|
(entry->next == &map->header ||
|
|
entry->next->start > entry->end))) {
|
|
|
|
/*
|
|
* found one. amap creation actions do not need to
|
|
* be undone, but the wired counts need to be restored.
|
|
*/
|
|
|
|
while (entry != &map->header && entry->end > start) {
|
|
entry->wired_count--;
|
|
entry = entry->prev;
|
|
}
|
|
if ((lockflags & UVM_LK_EXIT) == 0)
|
|
vm_map_unlock(map);
|
|
UVMHIST_LOG(maphist,"<- done (INVALID WIRE)",0,0,0,0);
|
|
return EINVAL;
|
|
}
|
|
entry = entry->next;
|
|
}
|
|
|
|
/*
|
|
* Pass 2.
|
|
*/
|
|
|
|
#ifdef DIAGNOSTIC
|
|
timestamp_save = map->timestamp;
|
|
#endif
|
|
vm_map_busy(map);
|
|
vm_map_unlock(map);
|
|
|
|
rv = 0;
|
|
entry = start_entry;
|
|
while (entry != &map->header && entry->start < end) {
|
|
if (entry->wired_count == 1) {
|
|
rv = uvm_fault_wire(map, entry->start, entry->end,
|
|
entry->max_protection, 1);
|
|
if (rv) {
|
|
|
|
/*
|
|
* wiring failed. break out of the loop.
|
|
* we'll clean up the map below, once we
|
|
* have a write lock again.
|
|
*/
|
|
|
|
break;
|
|
}
|
|
}
|
|
entry = entry->next;
|
|
}
|
|
|
|
if (rv) { /* failed? */
|
|
|
|
/*
|
|
* Get back to an exclusive (write) lock.
|
|
*/
|
|
|
|
vm_map_lock(map);
|
|
vm_map_unbusy(map);
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (timestamp_save + 1 != map->timestamp)
|
|
panic("uvm_map_pageable: stale map");
|
|
#endif
|
|
|
|
/*
|
|
* first drop the wiring count on all the entries
|
|
* which haven't actually been wired yet.
|
|
*/
|
|
|
|
failed_entry = entry;
|
|
while (entry != &map->header && entry->start < end) {
|
|
entry->wired_count--;
|
|
entry = entry->next;
|
|
}
|
|
|
|
/*
|
|
* now, unwire all the entries that were successfully
|
|
* wired above.
|
|
*/
|
|
|
|
entry = start_entry;
|
|
while (entry != failed_entry) {
|
|
entry->wired_count--;
|
|
if (VM_MAPENT_ISWIRED(entry) == 0)
|
|
uvm_map_entry_unwire(map, entry);
|
|
entry = entry->next;
|
|
}
|
|
if ((lockflags & UVM_LK_EXIT) == 0)
|
|
vm_map_unlock(map);
|
|
UVMHIST_LOG(maphist, "<- done (RV=%jd)", rv,0,0,0);
|
|
return (rv);
|
|
}
|
|
|
|
if ((lockflags & UVM_LK_EXIT) == 0) {
|
|
vm_map_unbusy(map);
|
|
} else {
|
|
|
|
/*
|
|
* Get back to an exclusive (write) lock.
|
|
*/
|
|
|
|
vm_map_lock(map);
|
|
vm_map_unbusy(map);
|
|
}
|
|
|
|
UVMHIST_LOG(maphist,"<- done (OK WIRE)",0,0,0,0);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* uvm_map_pageable_all: special case of uvm_map_pageable - affects
|
|
* all mapped regions.
|
|
*
|
|
* => map must not be locked.
|
|
* => if no flags are specified, all regions are unwired.
|
|
* => XXXJRT: has some of the same problems as uvm_map_pageable() above.
|
|
*/
|
|
|
|
int
|
|
uvm_map_pageable_all(struct vm_map *map, int flags, vsize_t limit)
|
|
{
|
|
struct vm_map_entry *entry, *failed_entry;
|
|
vsize_t size;
|
|
int rv;
|
|
#ifdef DIAGNOSTIC
|
|
u_int timestamp_save;
|
|
#endif
|
|
UVMHIST_FUNC(__func__);
|
|
UVMHIST_CALLARGS(maphist,"(map=%#jx,flags=%#jx)", (uintptr_t)map, flags,
|
|
0, 0);
|
|
|
|
KASSERT(map->flags & VM_MAP_PAGEABLE);
|
|
|
|
vm_map_lock(map);
|
|
|
|
/*
|
|
* handle wiring and unwiring separately.
|
|
*/
|
|
|
|
if (flags == 0) { /* unwire */
|
|
|
|
/*
|
|
* POSIX 1003.1b -- munlockall unlocks all regions,
|
|
* regardless of how many times mlockall has been called.
|
|
*/
|
|
|
|
for (entry = map->header.next; entry != &map->header;
|
|
entry = entry->next) {
|
|
if (VM_MAPENT_ISWIRED(entry))
|
|
uvm_map_entry_unwire(map, entry);
|
|
}
|
|
map->flags &= ~VM_MAP_WIREFUTURE;
|
|
vm_map_unlock(map);
|
|
UVMHIST_LOG(maphist,"<- done (OK UNWIRE)",0,0,0,0);
|
|
return 0;
|
|
}
|
|
|
|
if (flags & MCL_FUTURE) {
|
|
|
|
/*
|
|
* must wire all future mappings; remember this.
|
|
*/
|
|
|
|
map->flags |= VM_MAP_WIREFUTURE;
|
|
}
|
|
|
|
if ((flags & MCL_CURRENT) == 0) {
|
|
|
|
/*
|
|
* no more work to do!
|
|
*/
|
|
|
|
UVMHIST_LOG(maphist,"<- done (OK no wire)",0,0,0,0);
|
|
vm_map_unlock(map);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* wire case: in three passes [XXXCDC: ugly block of code here]
|
|
*
|
|
* 1: holding the write lock, count all pages mapped by non-wired
|
|
* entries. if this would cause us to go over our limit, we fail.
|
|
*
|
|
* 2: still holding the write lock, we create any anonymous maps that
|
|
* need to be created. then we increment its wiring count.
|
|
*
|
|
* 3: we downgrade to a read lock, and call uvm_fault_wire to fault
|
|
* in the pages for any newly wired area (wired_count == 1).
|
|
*
|
|
* downgrading to a read lock for uvm_fault_wire avoids a possible
|
|
* deadlock with another thread that may have faulted on one of
|
|
* the pages to be wired (it would mark the page busy, blocking
|
|
* us, then in turn block on the map lock that we hold). because
|
|
* of problems in the recursive lock package, we cannot upgrade
|
|
* to a write lock in vm_map_lookup. thus, any actions that
|
|
* require the write lock must be done beforehand. because we
|
|
* keep the read lock on the map, the copy-on-write status of the
|
|
* entries we modify here cannot change.
|
|
*/
|
|
|
|
for (size = 0, entry = map->header.next; entry != &map->header;
|
|
entry = entry->next) {
|
|
if (entry->protection != VM_PROT_NONE &&
|
|
VM_MAPENT_ISWIRED(entry) == 0) { /* not already wired? */
|
|
size += entry->end - entry->start;
|
|
}
|
|
}
|
|
|
|
if (atop(size) + uvmexp.wired > uvmexp.wiredmax) {
|
|
vm_map_unlock(map);
|
|
return ENOMEM;
|
|
}
|
|
|
|
if (limit != 0 &&
|
|
(size + ptoa(pmap_wired_count(vm_map_pmap(map))) > limit)) {
|
|
vm_map_unlock(map);
|
|
return ENOMEM;
|
|
}
|
|
|
|
/*
|
|
* Pass 2.
|
|
*/
|
|
|
|
for (entry = map->header.next; entry != &map->header;
|
|
entry = entry->next) {
|
|
if (entry->protection == VM_PROT_NONE)
|
|
continue;
|
|
if (VM_MAPENT_ISWIRED(entry) == 0) { /* not already wired? */
|
|
|
|
/*
|
|
* perform actions of vm_map_lookup that need the
|
|
* write lock on the map: create an anonymous map
|
|
* for a copy-on-write region, or an anonymous map
|
|
* for a zero-fill region. (XXXCDC: submap case
|
|
* ok?)
|
|
*/
|
|
|
|
if (!UVM_ET_ISSUBMAP(entry)) { /* not submap */
|
|
if (UVM_ET_ISNEEDSCOPY(entry) &&
|
|
((entry->max_protection & VM_PROT_WRITE) ||
|
|
(entry->object.uvm_obj == NULL))) {
|
|
amap_copy(map, entry, 0, entry->start,
|
|
entry->end);
|
|
/* XXXCDC: wait OK? */
|
|
}
|
|
}
|
|
}
|
|
entry->wired_count++;
|
|
}
|
|
|
|
/*
|
|
* Pass 3.
|
|
*/
|
|
|
|
#ifdef DIAGNOSTIC
|
|
timestamp_save = map->timestamp;
|
|
#endif
|
|
vm_map_busy(map);
|
|
vm_map_unlock(map);
|
|
|
|
rv = 0;
|
|
for (entry = map->header.next; entry != &map->header;
|
|
entry = entry->next) {
|
|
if (entry->wired_count == 1) {
|
|
rv = uvm_fault_wire(map, entry->start, entry->end,
|
|
entry->max_protection, 1);
|
|
if (rv) {
|
|
|
|
/*
|
|
* wiring failed. break out of the loop.
|
|
* we'll clean up the map below, once we
|
|
* have a write lock again.
|
|
*/
|
|
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (rv) {
|
|
|
|
/*
|
|
* Get back an exclusive (write) lock.
|
|
*/
|
|
|
|
vm_map_lock(map);
|
|
vm_map_unbusy(map);
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (timestamp_save + 1 != map->timestamp)
|
|
panic("uvm_map_pageable_all: stale map");
|
|
#endif
|
|
|
|
/*
|
|
* first drop the wiring count on all the entries
|
|
* which haven't actually been wired yet.
|
|
*
|
|
* Skip VM_PROT_NONE entries like we did above.
|
|
*/
|
|
|
|
failed_entry = entry;
|
|
for (/* nothing */; entry != &map->header;
|
|
entry = entry->next) {
|
|
if (entry->protection == VM_PROT_NONE)
|
|
continue;
|
|
entry->wired_count--;
|
|
}
|
|
|
|
/*
|
|
* now, unwire all the entries that were successfully
|
|
* wired above.
|
|
*
|
|
* Skip VM_PROT_NONE entries like we did above.
|
|
*/
|
|
|
|
for (entry = map->header.next; entry != failed_entry;
|
|
entry = entry->next) {
|
|
if (entry->protection == VM_PROT_NONE)
|
|
continue;
|
|
entry->wired_count--;
|
|
if (VM_MAPENT_ISWIRED(entry))
|
|
uvm_map_entry_unwire(map, entry);
|
|
}
|
|
vm_map_unlock(map);
|
|
UVMHIST_LOG(maphist,"<- done (RV=%jd)", rv,0,0,0);
|
|
return (rv);
|
|
}
|
|
|
|
vm_map_unbusy(map);
|
|
|
|
UVMHIST_LOG(maphist,"<- done (OK WIRE)",0,0,0,0);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* uvm_map_clean: clean out a map range
|
|
*
|
|
* => valid flags:
|
|
* if (flags & PGO_CLEANIT): dirty pages are cleaned first
|
|
* if (flags & PGO_SYNCIO): dirty pages are written synchronously
|
|
* if (flags & PGO_DEACTIVATE): any cached pages are deactivated after clean
|
|
* if (flags & PGO_FREE): any cached pages are freed after clean
|
|
* => returns an error if any part of the specified range isn't mapped
|
|
* => never a need to flush amap layer since the anonymous memory has
|
|
* no permanent home, but may deactivate pages there
|
|
* => called from sys_msync() and sys_madvise()
|
|
* => caller must not have map locked
|
|
*/
|
|
|
|
int
|
|
uvm_map_clean(struct vm_map *map, vaddr_t start, vaddr_t end, int flags)
|
|
{
|
|
struct vm_map_entry *current, *entry;
|
|
struct uvm_object *uobj;
|
|
struct vm_amap *amap;
|
|
struct vm_anon *anon;
|
|
struct vm_page *pg;
|
|
vaddr_t offset;
|
|
vsize_t size;
|
|
voff_t uoff;
|
|
int error, refs;
|
|
UVMHIST_FUNC(__func__);
|
|
UVMHIST_CALLARGS(maphist,"(map=%#jx,start=%#jx,end=%#jx,flags=%#jx)",
|
|
(uintptr_t)map, start, end, flags);
|
|
|
|
KASSERT((flags & (PGO_FREE|PGO_DEACTIVATE)) !=
|
|
(PGO_FREE|PGO_DEACTIVATE));
|
|
|
|
vm_map_lock(map);
|
|
VM_MAP_RANGE_CHECK(map, start, end);
|
|
if (!uvm_map_lookup_entry(map, start, &entry)) {
|
|
vm_map_unlock(map);
|
|
return EFAULT;
|
|
}
|
|
|
|
/*
|
|
* Make a first pass to check for holes and wiring problems.
|
|
*/
|
|
|
|
for (current = entry; current->start < end; current = current->next) {
|
|
if (UVM_ET_ISSUBMAP(current)) {
|
|
vm_map_unlock(map);
|
|
return EINVAL;
|
|
}
|
|
if ((flags & PGO_FREE) != 0 && VM_MAPENT_ISWIRED(entry)) {
|
|
vm_map_unlock(map);
|
|
return EBUSY;
|
|
}
|
|
if (end <= current->end) {
|
|
break;
|
|
}
|
|
if (current->end != current->next->start) {
|
|
vm_map_unlock(map);
|
|
return EFAULT;
|
|
}
|
|
}
|
|
|
|
vm_map_busy(map);
|
|
vm_map_unlock(map);
|
|
error = 0;
|
|
for (current = entry; start < end; current = current->next) {
|
|
amap = current->aref.ar_amap; /* upper layer */
|
|
uobj = current->object.uvm_obj; /* lower layer */
|
|
KASSERT(start >= current->start);
|
|
|
|
/*
|
|
* No amap cleaning necessary if:
|
|
*
|
|
* (1) There's no amap.
|
|
*
|
|
* (2) We're not deactivating or freeing pages.
|
|
*/
|
|
|
|
if (amap == NULL || (flags & (PGO_DEACTIVATE|PGO_FREE)) == 0)
|
|
goto flush_object;
|
|
|
|
offset = start - current->start;
|
|
size = MIN(end, current->end) - start;
|
|
|
|
amap_lock(amap, RW_WRITER);
|
|
for ( ; size != 0; size -= PAGE_SIZE, offset += PAGE_SIZE) {
|
|
anon = amap_lookup(¤t->aref, offset);
|
|
if (anon == NULL)
|
|
continue;
|
|
|
|
KASSERT(anon->an_lock == amap->am_lock);
|
|
pg = anon->an_page;
|
|
if (pg == NULL) {
|
|
continue;
|
|
}
|
|
if (pg->flags & PG_BUSY) {
|
|
continue;
|
|
}
|
|
|
|
switch (flags & (PGO_CLEANIT|PGO_FREE|PGO_DEACTIVATE)) {
|
|
|
|
/*
|
|
* In these first 3 cases, we just deactivate the page.
|
|
*/
|
|
|
|
case PGO_CLEANIT|PGO_FREE:
|
|
case PGO_CLEANIT|PGO_DEACTIVATE:
|
|
case PGO_DEACTIVATE:
|
|
deactivate_it:
|
|
/*
|
|
* skip the page if it's loaned or wired,
|
|
* since it shouldn't be on a paging queue
|
|
* at all in these cases.
|
|
*/
|
|
|
|
if (pg->loan_count != 0 ||
|
|
pg->wire_count != 0) {
|
|
continue;
|
|
}
|
|
KASSERT(pg->uanon == anon);
|
|
uvm_pagelock(pg);
|
|
uvm_pagedeactivate(pg);
|
|
uvm_pageunlock(pg);
|
|
continue;
|
|
|
|
case PGO_FREE:
|
|
|
|
/*
|
|
* If there are multiple references to
|
|
* the amap, just deactivate the page.
|
|
*/
|
|
|
|
if (amap_refs(amap) > 1)
|
|
goto deactivate_it;
|
|
|
|
/* skip the page if it's wired */
|
|
if (pg->wire_count != 0) {
|
|
continue;
|
|
}
|
|
amap_unadd(¤t->aref, offset);
|
|
refs = --anon->an_ref;
|
|
if (refs == 0) {
|
|
uvm_anfree(anon);
|
|
}
|
|
continue;
|
|
}
|
|
}
|
|
amap_unlock(amap);
|
|
|
|
flush_object:
|
|
/*
|
|
* flush pages if we've got a valid backing object.
|
|
* note that we must always clean object pages before
|
|
* freeing them since otherwise we could reveal stale
|
|
* data from files.
|
|
*/
|
|
|
|
uoff = current->offset + (start - current->start);
|
|
size = MIN(end, current->end) - start;
|
|
if (uobj != NULL) {
|
|
rw_enter(uobj->vmobjlock, RW_WRITER);
|
|
if (uobj->pgops->pgo_put != NULL)
|
|
error = (uobj->pgops->pgo_put)(uobj, uoff,
|
|
uoff + size, flags | PGO_CLEANIT);
|
|
else
|
|
error = 0;
|
|
}
|
|
start += size;
|
|
}
|
|
vm_map_unbusy(map);
|
|
return error;
|
|
}
|
|
|
|
|
|
/*
|
|
* uvm_map_checkprot: check protection in map
|
|
*
|
|
* => must allow specified protection in a fully allocated region.
|
|
* => map must be read or write locked by caller.
|
|
*/
|
|
|
|
bool
|
|
uvm_map_checkprot(struct vm_map *map, vaddr_t start, vaddr_t end,
|
|
vm_prot_t protection)
|
|
{
|
|
struct vm_map_entry *entry;
|
|
struct vm_map_entry *tmp_entry;
|
|
|
|
if (!uvm_map_lookup_entry(map, start, &tmp_entry)) {
|
|
return (false);
|
|
}
|
|
entry = tmp_entry;
|
|
while (start < end) {
|
|
if (entry == &map->header) {
|
|
return (false);
|
|
}
|
|
|
|
/*
|
|
* no holes allowed
|
|
*/
|
|
|
|
if (start < entry->start) {
|
|
return (false);
|
|
}
|
|
|
|
/*
|
|
* check protection associated with entry
|
|
*/
|
|
|
|
if ((entry->protection & protection) != protection) {
|
|
return (false);
|
|
}
|
|
start = entry->end;
|
|
entry = entry->next;
|
|
}
|
|
return (true);
|
|
}
|
|
|
|
/*
|
|
* uvmspace_alloc: allocate a vmspace structure.
|
|
*
|
|
* - structure includes vm_map and pmap
|
|
* - XXX: no locking on this structure
|
|
* - refcnt set to 1, rest must be init'd by caller
|
|
*/
|
|
struct vmspace *
|
|
uvmspace_alloc(vaddr_t vmin, vaddr_t vmax, bool topdown)
|
|
{
|
|
struct vmspace *vm;
|
|
UVMHIST_FUNC(__func__); UVMHIST_CALLED(maphist);
|
|
|
|
vm = kmem_alloc(sizeof(*vm), KM_SLEEP);
|
|
uvmspace_init(vm, NULL, vmin, vmax, topdown);
|
|
UVMHIST_LOG(maphist,"<- done (vm=%#jx)", (uintptr_t)vm, 0, 0, 0);
|
|
return (vm);
|
|
}
|
|
|
|
/*
|
|
* uvmspace_init: initialize a vmspace structure.
|
|
*
|
|
* - XXX: no locking on this structure
|
|
* - refcnt set to 1, rest must be init'd by caller
|
|
*/
|
|
void
|
|
uvmspace_init(struct vmspace *vm, struct pmap *pmap, vaddr_t vmin,
|
|
vaddr_t vmax, bool topdown)
|
|
{
|
|
UVMHIST_FUNC(__func__);
|
|
UVMHIST_CALLARGS(maphist, "(vm=%#jx, pmap=%#jx, vmin=%#jx, vmax=%#jx",
|
|
(uintptr_t)vm, (uintptr_t)pmap, vmin, vmax);
|
|
UVMHIST_LOG(maphist, " topdown=%ju)", topdown, 0, 0, 0);
|
|
|
|
memset(vm, 0, sizeof(*vm));
|
|
uvm_map_setup(&vm->vm_map, vmin, vmax, VM_MAP_PAGEABLE
|
|
| (topdown ? VM_MAP_TOPDOWN : 0)
|
|
);
|
|
if (pmap)
|
|
pmap_reference(pmap);
|
|
else
|
|
pmap = pmap_create();
|
|
vm->vm_map.pmap = pmap;
|
|
vm->vm_refcnt = 1;
|
|
UVMHIST_LOG(maphist,"<- done",0,0,0,0);
|
|
}
|
|
|
|
/*
|
|
* uvmspace_share: share a vmspace between two processes
|
|
*
|
|
* - used for vfork, threads(?)
|
|
*/
|
|
|
|
void
|
|
uvmspace_share(struct proc *p1, struct proc *p2)
|
|
{
|
|
|
|
uvmspace_addref(p1->p_vmspace);
|
|
p2->p_vmspace = p1->p_vmspace;
|
|
}
|
|
|
|
#if 0
|
|
|
|
/*
|
|
* uvmspace_unshare: ensure that process "p" has its own, unshared, vmspace
|
|
*
|
|
* - XXX: no locking on vmspace
|
|
*/
|
|
|
|
void
|
|
uvmspace_unshare(struct lwp *l)
|
|
{
|
|
struct proc *p = l->l_proc;
|
|
struct vmspace *nvm, *ovm = p->p_vmspace;
|
|
|
|
if (ovm->vm_refcnt == 1)
|
|
/* nothing to do: vmspace isn't shared in the first place */
|
|
return;
|
|
|
|
/* make a new vmspace, still holding old one */
|
|
nvm = uvmspace_fork(ovm);
|
|
|
|
kpreempt_disable();
|
|
pmap_deactivate(l); /* unbind old vmspace */
|
|
p->p_vmspace = nvm;
|
|
pmap_activate(l); /* switch to new vmspace */
|
|
kpreempt_enable();
|
|
|
|
uvmspace_free(ovm); /* drop reference to old vmspace */
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
/*
|
|
* uvmspace_spawn: a new process has been spawned and needs a vmspace
|
|
*/
|
|
|
|
void
|
|
uvmspace_spawn(struct lwp *l, vaddr_t start, vaddr_t end, bool topdown)
|
|
{
|
|
struct proc *p = l->l_proc;
|
|
struct vmspace *nvm;
|
|
|
|
#ifdef __HAVE_CPU_VMSPACE_EXEC
|
|
cpu_vmspace_exec(l, start, end);
|
|
#endif
|
|
|
|
nvm = uvmspace_alloc(start, end, topdown);
|
|
kpreempt_disable();
|
|
p->p_vmspace = nvm;
|
|
pmap_activate(l);
|
|
kpreempt_enable();
|
|
}
|
|
|
|
/*
|
|
* uvmspace_exec: the process wants to exec a new program
|
|
*/
|
|
|
|
void
|
|
uvmspace_exec(struct lwp *l, vaddr_t start, vaddr_t end, bool topdown)
|
|
{
|
|
struct proc *p = l->l_proc;
|
|
struct vmspace *nvm, *ovm = p->p_vmspace;
|
|
struct vm_map *map;
|
|
int flags;
|
|
|
|
KASSERT(ovm != NULL);
|
|
#ifdef __HAVE_CPU_VMSPACE_EXEC
|
|
cpu_vmspace_exec(l, start, end);
|
|
#endif
|
|
|
|
map = &ovm->vm_map;
|
|
/*
|
|
* see if more than one process is using this vmspace...
|
|
*/
|
|
|
|
if (ovm->vm_refcnt == 1
|
|
&& topdown == ((ovm->vm_map.flags & VM_MAP_TOPDOWN) != 0)) {
|
|
|
|
/*
|
|
* if p is the only process using its vmspace then we can safely
|
|
* recycle that vmspace for the program that is being exec'd.
|
|
* But only if TOPDOWN matches the requested value for the new
|
|
* vm space!
|
|
*/
|
|
|
|
/*
|
|
* SYSV SHM semantics require us to kill all segments on an exec
|
|
*/
|
|
if (uvm_shmexit && ovm->vm_shm)
|
|
(*uvm_shmexit)(ovm);
|
|
|
|
/*
|
|
* POSIX 1003.1b -- "lock future mappings" is revoked
|
|
* when a process execs another program image.
|
|
*/
|
|
|
|
map->flags &= ~VM_MAP_WIREFUTURE;
|
|
|
|
/*
|
|
* now unmap the old program.
|
|
*
|
|
* XXX set VM_MAP_DYING for the duration, so pmap_update()
|
|
* is not called until the pmap has been totally cleared out
|
|
* after pmap_remove_all(), or it can confuse some pmap
|
|
* implementations. it would be nice to handle this by
|
|
* deferring the pmap_update() while it is known the address
|
|
* space is not visible to any user LWP other than curlwp,
|
|
* but there isn't an elegant way of inferring that right
|
|
* now.
|
|
*/
|
|
|
|
flags = pmap_remove_all(map->pmap) ? UVM_FLAG_VAONLY : 0;
|
|
map->flags |= VM_MAP_DYING;
|
|
uvm_unmap1(map, vm_map_min(map), vm_map_max(map), flags);
|
|
map->flags &= ~VM_MAP_DYING;
|
|
pmap_update(map->pmap);
|
|
KASSERT(map->header.prev == &map->header);
|
|
KASSERT(map->nentries == 0);
|
|
|
|
/*
|
|
* resize the map
|
|
*/
|
|
|
|
vm_map_setmin(map, start);
|
|
vm_map_setmax(map, end);
|
|
} else {
|
|
|
|
/*
|
|
* p's vmspace is being shared, so we can't reuse it for p since
|
|
* it is still being used for others. allocate a new vmspace
|
|
* for p
|
|
*/
|
|
|
|
nvm = uvmspace_alloc(start, end, topdown);
|
|
|
|
/*
|
|
* install new vmspace and drop our ref to the old one.
|
|
*/
|
|
|
|
kpreempt_disable();
|
|
pmap_deactivate(l);
|
|
p->p_vmspace = nvm;
|
|
pmap_activate(l);
|
|
kpreempt_enable();
|
|
|
|
uvmspace_free(ovm);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* uvmspace_addref: add a reference to a vmspace.
|
|
*/
|
|
|
|
void
|
|
uvmspace_addref(struct vmspace *vm)
|
|
{
|
|
|
|
KASSERT((vm->vm_map.flags & VM_MAP_DYING) == 0);
|
|
KASSERT(vm->vm_refcnt > 0);
|
|
atomic_inc_uint(&vm->vm_refcnt);
|
|
}
|
|
|
|
/*
|
|
* uvmspace_free: free a vmspace data structure
|
|
*/
|
|
|
|
void
|
|
uvmspace_free(struct vmspace *vm)
|
|
{
|
|
struct vm_map_entry *dead_entries;
|
|
struct vm_map *map = &vm->vm_map;
|
|
int flags;
|
|
|
|
UVMHIST_FUNC(__func__);
|
|
UVMHIST_CALLARGS(maphist,"(vm=%#jx) ref=%jd", (uintptr_t)vm,
|
|
vm->vm_refcnt, 0, 0);
|
|
|
|
membar_release();
|
|
if (atomic_dec_uint_nv(&vm->vm_refcnt) > 0)
|
|
return;
|
|
membar_acquire();
|
|
|
|
/*
|
|
* at this point, there should be no other references to the map.
|
|
* delete all of the mappings, then destroy the pmap.
|
|
*/
|
|
|
|
map->flags |= VM_MAP_DYING;
|
|
flags = pmap_remove_all(map->pmap) ? UVM_FLAG_VAONLY : 0;
|
|
|
|
/* Get rid of any SYSV shared memory segments. */
|
|
if (uvm_shmexit && vm->vm_shm != NULL)
|
|
(*uvm_shmexit)(vm);
|
|
|
|
if (map->nentries) {
|
|
uvm_unmap_remove(map, vm_map_min(map), vm_map_max(map),
|
|
&dead_entries, flags);
|
|
if (dead_entries != NULL)
|
|
uvm_unmap_detach(dead_entries, 0);
|
|
}
|
|
KASSERT(map->nentries == 0);
|
|
KASSERT(map->size == 0);
|
|
|
|
mutex_destroy(&map->misc_lock);
|
|
rw_destroy(&map->lock);
|
|
cv_destroy(&map->cv);
|
|
pmap_destroy(map->pmap);
|
|
kmem_free(vm, sizeof(*vm));
|
|
}
|
|
|
|
static struct vm_map_entry *
|
|
uvm_mapent_clone(struct vm_map *new_map, struct vm_map_entry *old_entry,
|
|
int flags)
|
|
{
|
|
struct vm_map_entry *new_entry;
|
|
|
|
new_entry = uvm_mapent_alloc(new_map, 0);
|
|
/* old_entry -> new_entry */
|
|
uvm_mapent_copy(old_entry, new_entry);
|
|
|
|
/* new pmap has nothing wired in it */
|
|
new_entry->wired_count = 0;
|
|
|
|
/*
|
|
* gain reference to object backing the map (can't
|
|
* be a submap, already checked this case).
|
|
*/
|
|
|
|
if (new_entry->aref.ar_amap)
|
|
uvm_map_reference_amap(new_entry, flags);
|
|
|
|
if (new_entry->object.uvm_obj &&
|
|
new_entry->object.uvm_obj->pgops->pgo_reference)
|
|
new_entry->object.uvm_obj->pgops->pgo_reference(
|
|
new_entry->object.uvm_obj);
|
|
|
|
/* insert entry at end of new_map's entry list */
|
|
uvm_map_entry_link(new_map, new_map->header.prev,
|
|
new_entry);
|
|
|
|
return new_entry;
|
|
}
|
|
|
|
/*
|
|
* share the mapping: this means we want the old and
|
|
* new entries to share amaps and backing objects.
|
|
*/
|
|
static void
|
|
uvm_mapent_forkshared(struct vm_map *new_map, struct vm_map *old_map,
|
|
struct vm_map_entry *old_entry)
|
|
{
|
|
/*
|
|
* if the old_entry needs a new amap (due to prev fork)
|
|
* then we need to allocate it now so that we have
|
|
* something we own to share with the new_entry. [in
|
|
* other words, we need to clear needs_copy]
|
|
*/
|
|
|
|
if (UVM_ET_ISNEEDSCOPY(old_entry)) {
|
|
/* get our own amap, clears needs_copy */
|
|
amap_copy(old_map, old_entry, AMAP_COPY_NOCHUNK,
|
|
0, 0);
|
|
/* XXXCDC: WAITOK??? */
|
|
}
|
|
|
|
uvm_mapent_clone(new_map, old_entry, AMAP_SHARED);
|
|
}
|
|
|
|
|
|
static void
|
|
uvm_mapent_forkcopy(struct vm_map *new_map, struct vm_map *old_map,
|
|
struct vm_map_entry *old_entry)
|
|
{
|
|
struct vm_map_entry *new_entry;
|
|
|
|
/*
|
|
* copy-on-write the mapping (using mmap's
|
|
* MAP_PRIVATE semantics)
|
|
*
|
|
* allocate new_entry, adjust reference counts.
|
|
* (note that new references are read-only).
|
|
*/
|
|
|
|
new_entry = uvm_mapent_clone(new_map, old_entry, 0);
|
|
|
|
new_entry->etype |=
|
|
(UVM_ET_COPYONWRITE|UVM_ET_NEEDSCOPY);
|
|
|
|
/*
|
|
* the new entry will need an amap. it will either
|
|
* need to be copied from the old entry or created
|
|
* from scratch (if the old entry does not have an
|
|
* amap). can we defer this process until later
|
|
* (by setting "needs_copy") or do we need to copy
|
|
* the amap now?
|
|
*
|
|
* we must copy the amap now if any of the following
|
|
* conditions hold:
|
|
* 1. the old entry has an amap and that amap is
|
|
* being shared. this means that the old (parent)
|
|
* process is sharing the amap with another
|
|
* process. if we do not clear needs_copy here
|
|
* we will end up in a situation where both the
|
|
* parent and child process are referring to the
|
|
* same amap with "needs_copy" set. if the
|
|
* parent write-faults, the fault routine will
|
|
* clear "needs_copy" in the parent by allocating
|
|
* a new amap. this is wrong because the
|
|
* parent is supposed to be sharing the old amap
|
|
* and the new amap will break that.
|
|
*
|
|
* 2. if the old entry has an amap and a non-zero
|
|
* wire count then we are going to have to call
|
|
* amap_cow_now to avoid page faults in the
|
|
* parent process. since amap_cow_now requires
|
|
* "needs_copy" to be clear we might as well
|
|
* clear it here as well.
|
|
*
|
|
*/
|
|
|
|
if (old_entry->aref.ar_amap != NULL) {
|
|
if ((amap_flags(old_entry->aref.ar_amap) & AMAP_SHARED) != 0 ||
|
|
VM_MAPENT_ISWIRED(old_entry)) {
|
|
|
|
amap_copy(new_map, new_entry,
|
|
AMAP_COPY_NOCHUNK, 0, 0);
|
|
/* XXXCDC: M_WAITOK ... ok? */
|
|
}
|
|
}
|
|
|
|
/*
|
|
* if the parent's entry is wired down, then the
|
|
* parent process does not want page faults on
|
|
* access to that memory. this means that we
|
|
* cannot do copy-on-write because we can't write
|
|
* protect the old entry. in this case we
|
|
* resolve all copy-on-write faults now, using
|
|
* amap_cow_now. note that we have already
|
|
* allocated any needed amap (above).
|
|
*/
|
|
|
|
if (VM_MAPENT_ISWIRED(old_entry)) {
|
|
|
|
/*
|
|
* resolve all copy-on-write faults now
|
|
* (note that there is nothing to do if
|
|
* the old mapping does not have an amap).
|
|
*/
|
|
if (old_entry->aref.ar_amap)
|
|
amap_cow_now(new_map, new_entry);
|
|
|
|
} else {
|
|
/*
|
|
* setup mappings to trigger copy-on-write faults
|
|
* we must write-protect the parent if it has
|
|
* an amap and it is not already "needs_copy"...
|
|
* if it is already "needs_copy" then the parent
|
|
* has already been write-protected by a previous
|
|
* fork operation.
|
|
*/
|
|
if (old_entry->aref.ar_amap &&
|
|
!UVM_ET_ISNEEDSCOPY(old_entry)) {
|
|
if (old_entry->max_protection & VM_PROT_WRITE) {
|
|
#ifdef __HAVE_UNLOCKED_PMAP /* XXX temporary */
|
|
uvm_map_lock_entry(old_entry, RW_WRITER);
|
|
#else
|
|
uvm_map_lock_entry(old_entry, RW_READER);
|
|
#endif
|
|
pmap_protect(old_map->pmap,
|
|
old_entry->start, old_entry->end,
|
|
old_entry->protection & ~VM_PROT_WRITE);
|
|
uvm_map_unlock_entry(old_entry);
|
|
}
|
|
old_entry->etype |= UVM_ET_NEEDSCOPY;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* zero the mapping: the new entry will be zero initialized
|
|
*/
|
|
static void
|
|
uvm_mapent_forkzero(struct vm_map *new_map, struct vm_map *old_map,
|
|
struct vm_map_entry *old_entry)
|
|
{
|
|
struct vm_map_entry *new_entry;
|
|
|
|
new_entry = uvm_mapent_clone(new_map, old_entry, 0);
|
|
|
|
new_entry->etype |=
|
|
(UVM_ET_COPYONWRITE|UVM_ET_NEEDSCOPY);
|
|
|
|
if (new_entry->aref.ar_amap) {
|
|
uvm_map_unreference_amap(new_entry, 0);
|
|
new_entry->aref.ar_pageoff = 0;
|
|
new_entry->aref.ar_amap = NULL;
|
|
}
|
|
|
|
if (UVM_ET_ISOBJ(new_entry)) {
|
|
if (new_entry->object.uvm_obj->pgops->pgo_detach)
|
|
new_entry->object.uvm_obj->pgops->pgo_detach(
|
|
new_entry->object.uvm_obj);
|
|
new_entry->object.uvm_obj = NULL;
|
|
new_entry->offset = 0;
|
|
new_entry->etype &= ~UVM_ET_OBJ;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* F O R K - m a i n e n t r y p o i n t
|
|
*/
|
|
/*
|
|
* uvmspace_fork: fork a process' main map
|
|
*
|
|
* => create a new vmspace for child process from parent.
|
|
* => parent's map must not be locked.
|
|
*/
|
|
|
|
struct vmspace *
|
|
uvmspace_fork(struct vmspace *vm1)
|
|
{
|
|
struct vmspace *vm2;
|
|
struct vm_map *old_map = &vm1->vm_map;
|
|
struct vm_map *new_map;
|
|
struct vm_map_entry *old_entry;
|
|
UVMHIST_FUNC(__func__); UVMHIST_CALLED(maphist);
|
|
|
|
vm_map_lock(old_map);
|
|
|
|
vm2 = uvmspace_alloc(vm_map_min(old_map), vm_map_max(old_map),
|
|
vm1->vm_map.flags & VM_MAP_TOPDOWN);
|
|
memcpy(&vm2->vm_startcopy, &vm1->vm_startcopy,
|
|
(char *) (vm1 + 1) - (char *) &vm1->vm_startcopy);
|
|
new_map = &vm2->vm_map; /* XXX */
|
|
|
|
old_entry = old_map->header.next;
|
|
new_map->size = old_map->size;
|
|
|
|
/*
|
|
* go entry-by-entry
|
|
*/
|
|
|
|
while (old_entry != &old_map->header) {
|
|
|
|
/*
|
|
* first, some sanity checks on the old entry
|
|
*/
|
|
|
|
KASSERT(!UVM_ET_ISSUBMAP(old_entry));
|
|
KASSERT(UVM_ET_ISCOPYONWRITE(old_entry) ||
|
|
!UVM_ET_ISNEEDSCOPY(old_entry));
|
|
|
|
switch (old_entry->inheritance) {
|
|
case MAP_INHERIT_NONE:
|
|
/*
|
|
* drop the mapping, modify size
|
|
*/
|
|
new_map->size -= old_entry->end - old_entry->start;
|
|
break;
|
|
|
|
case MAP_INHERIT_SHARE:
|
|
uvm_mapent_forkshared(new_map, old_map, old_entry);
|
|
break;
|
|
|
|
case MAP_INHERIT_COPY:
|
|
uvm_mapent_forkcopy(new_map, old_map, old_entry);
|
|
break;
|
|
|
|
case MAP_INHERIT_ZERO:
|
|
uvm_mapent_forkzero(new_map, old_map, old_entry);
|
|
break;
|
|
default:
|
|
KASSERT(0);
|
|
break;
|
|
}
|
|
old_entry = old_entry->next;
|
|
}
|
|
|
|
pmap_update(old_map->pmap);
|
|
vm_map_unlock(old_map);
|
|
|
|
if (uvm_shmfork && vm1->vm_shm)
|
|
(*uvm_shmfork)(vm1, vm2);
|
|
|
|
#ifdef PMAP_FORK
|
|
pmap_fork(vm1->vm_map.pmap, vm2->vm_map.pmap);
|
|
#endif
|
|
|
|
UVMHIST_LOG(maphist,"<- done",0,0,0,0);
|
|
return (vm2);
|
|
}
|
|
|
|
|
|
/*
|
|
* uvm_mapent_trymerge: try to merge an entry with its neighbors.
|
|
*
|
|
* => called with map locked.
|
|
* => return non zero if successfully merged.
|
|
*/
|
|
|
|
int
|
|
uvm_mapent_trymerge(struct vm_map *map, struct vm_map_entry *entry, int flags)
|
|
{
|
|
struct uvm_object *uobj;
|
|
struct vm_map_entry *next;
|
|
struct vm_map_entry *prev;
|
|
vsize_t size;
|
|
int merged = 0;
|
|
bool copying;
|
|
int newetype;
|
|
|
|
if (entry->aref.ar_amap != NULL) {
|
|
return 0;
|
|
}
|
|
if ((entry->flags & UVM_MAP_NOMERGE) != 0) {
|
|
return 0;
|
|
}
|
|
|
|
uobj = entry->object.uvm_obj;
|
|
size = entry->end - entry->start;
|
|
copying = (flags & UVM_MERGE_COPYING) != 0;
|
|
newetype = copying ? (entry->etype & ~UVM_ET_NEEDSCOPY) : entry->etype;
|
|
|
|
next = entry->next;
|
|
if (next != &map->header &&
|
|
next->start == entry->end &&
|
|
((copying && next->aref.ar_amap != NULL &&
|
|
amap_refs(next->aref.ar_amap) == 1) ||
|
|
(!copying && next->aref.ar_amap == NULL)) &&
|
|
UVM_ET_ISCOMPATIBLE(next, newetype,
|
|
uobj, entry->flags, entry->protection,
|
|
entry->max_protection, entry->inheritance, entry->advice,
|
|
entry->wired_count) &&
|
|
(uobj == NULL || entry->offset + size == next->offset)) {
|
|
int error;
|
|
|
|
if (copying) {
|
|
error = amap_extend(next, size,
|
|
AMAP_EXTEND_NOWAIT|AMAP_EXTEND_BACKWARDS);
|
|
} else {
|
|
error = 0;
|
|
}
|
|
if (error == 0) {
|
|
if (uobj) {
|
|
if (uobj->pgops->pgo_detach) {
|
|
uobj->pgops->pgo_detach(uobj);
|
|
}
|
|
}
|
|
|
|
entry->end = next->end;
|
|
clear_hints(map, next);
|
|
uvm_map_entry_unlink(map, next);
|
|
if (copying) {
|
|
entry->aref = next->aref;
|
|
entry->etype &= ~UVM_ET_NEEDSCOPY;
|
|
}
|
|
uvm_map_check(map, "trymerge forwardmerge");
|
|
uvm_mapent_free(next);
|
|
merged++;
|
|
}
|
|
}
|
|
|
|
prev = entry->prev;
|
|
if (prev != &map->header &&
|
|
prev->end == entry->start &&
|
|
((copying && !merged && prev->aref.ar_amap != NULL &&
|
|
amap_refs(prev->aref.ar_amap) == 1) ||
|
|
(!copying && prev->aref.ar_amap == NULL)) &&
|
|
UVM_ET_ISCOMPATIBLE(prev, newetype,
|
|
uobj, entry->flags, entry->protection,
|
|
entry->max_protection, entry->inheritance, entry->advice,
|
|
entry->wired_count) &&
|
|
(uobj == NULL ||
|
|
prev->offset + prev->end - prev->start == entry->offset)) {
|
|
int error;
|
|
|
|
if (copying) {
|
|
error = amap_extend(prev, size,
|
|
AMAP_EXTEND_NOWAIT|AMAP_EXTEND_FORWARDS);
|
|
} else {
|
|
error = 0;
|
|
}
|
|
if (error == 0) {
|
|
if (uobj) {
|
|
if (uobj->pgops->pgo_detach) {
|
|
uobj->pgops->pgo_detach(uobj);
|
|
}
|
|
entry->offset = prev->offset;
|
|
}
|
|
|
|
entry->start = prev->start;
|
|
clear_hints(map, prev);
|
|
uvm_map_entry_unlink(map, prev);
|
|
if (copying) {
|
|
entry->aref = prev->aref;
|
|
entry->etype &= ~UVM_ET_NEEDSCOPY;
|
|
}
|
|
uvm_map_check(map, "trymerge backmerge");
|
|
uvm_mapent_free(prev);
|
|
merged++;
|
|
}
|
|
}
|
|
|
|
return merged;
|
|
}
|
|
|
|
/*
|
|
* uvm_map_setup: init map
|
|
*
|
|
* => map must not be in service yet.
|
|
*/
|
|
|
|
void
|
|
uvm_map_setup(struct vm_map *map, vaddr_t vmin, vaddr_t vmax, int flags)
|
|
{
|
|
|
|
rb_tree_init(&map->rb_tree, &uvm_map_tree_ops);
|
|
map->header.next = map->header.prev = &map->header;
|
|
map->nentries = 0;
|
|
map->size = 0;
|
|
map->ref_count = 1;
|
|
vm_map_setmin(map, vmin);
|
|
vm_map_setmax(map, vmax);
|
|
map->flags = flags;
|
|
map->first_free = &map->header;
|
|
map->hint = &map->header;
|
|
map->timestamp = 0;
|
|
map->busy = NULL;
|
|
|
|
rw_init(&map->lock);
|
|
cv_init(&map->cv, "vm_map");
|
|
mutex_init(&map->misc_lock, MUTEX_DRIVER, IPL_NONE);
|
|
}
|
|
|
|
/*
|
|
* U N M A P - m a i n e n t r y p o i n t
|
|
*/
|
|
|
|
/*
|
|
* uvm_unmap1: remove mappings from a vm_map (from "start" up to "stop")
|
|
*
|
|
* => caller must check alignment and size
|
|
* => map must be unlocked (we will lock it)
|
|
* => flags is UVM_FLAG_QUANTUM or 0.
|
|
*/
|
|
|
|
void
|
|
uvm_unmap1(struct vm_map *map, vaddr_t start, vaddr_t end, int flags)
|
|
{
|
|
struct vm_map_entry *dead_entries;
|
|
UVMHIST_FUNC(__func__);
|
|
UVMHIST_CALLARGS(maphist, " (map=%#jx, start=%#jx, end=%#jx)",
|
|
(uintptr_t)map, start, end, 0);
|
|
|
|
KASSERTMSG(start < end,
|
|
"%s: map %p: start %#jx < end %#jx", __func__, map,
|
|
(uintmax_t)start, (uintmax_t)end);
|
|
if (map == kernel_map) {
|
|
LOCKDEBUG_MEM_CHECK((void *)start, end - start);
|
|
}
|
|
|
|
/*
|
|
* work now done by helper functions. wipe the pmap's and then
|
|
* detach from the dead entries...
|
|
*/
|
|
vm_map_lock(map);
|
|
uvm_unmap_remove(map, start, end, &dead_entries, flags);
|
|
vm_map_unlock(map);
|
|
|
|
if (dead_entries != NULL)
|
|
uvm_unmap_detach(dead_entries, 0);
|
|
|
|
UVMHIST_LOG(maphist, "<- done", 0,0,0,0);
|
|
}
|
|
|
|
|
|
/*
|
|
* uvm_map_reference: add reference to a map
|
|
*
|
|
* => map need not be locked
|
|
*/
|
|
|
|
void
|
|
uvm_map_reference(struct vm_map *map)
|
|
{
|
|
|
|
atomic_inc_uint(&map->ref_count);
|
|
}
|
|
|
|
void
|
|
uvm_map_lock_entry(struct vm_map_entry *entry, krw_t op)
|
|
{
|
|
|
|
if (entry->aref.ar_amap != NULL) {
|
|
amap_lock(entry->aref.ar_amap, op);
|
|
}
|
|
if (UVM_ET_ISOBJ(entry)) {
|
|
rw_enter(entry->object.uvm_obj->vmobjlock, op);
|
|
}
|
|
}
|
|
|
|
void
|
|
uvm_map_unlock_entry(struct vm_map_entry *entry)
|
|
{
|
|
|
|
if (UVM_ET_ISOBJ(entry)) {
|
|
rw_exit(entry->object.uvm_obj->vmobjlock);
|
|
}
|
|
if (entry->aref.ar_amap != NULL) {
|
|
amap_unlock(entry->aref.ar_amap);
|
|
}
|
|
}
|
|
|
|
#define UVM_VOADDR_TYPE_MASK 0x3UL
|
|
#define UVM_VOADDR_TYPE_UOBJ 0x1UL
|
|
#define UVM_VOADDR_TYPE_ANON 0x2UL
|
|
#define UVM_VOADDR_OBJECT_MASK ~UVM_VOADDR_TYPE_MASK
|
|
|
|
#define UVM_VOADDR_GET_TYPE(voa) \
|
|
((voa)->object & UVM_VOADDR_TYPE_MASK)
|
|
#define UVM_VOADDR_GET_OBJECT(voa) \
|
|
((voa)->object & UVM_VOADDR_OBJECT_MASK)
|
|
#define UVM_VOADDR_SET_OBJECT(voa, obj, type) \
|
|
do { \
|
|
KASSERT(((uintptr_t)(obj) & UVM_VOADDR_TYPE_MASK) == 0); \
|
|
(voa)->object = ((uintptr_t)(obj)) | (type); \
|
|
} while (/*CONSTCOND*/0)
|
|
|
|
#define UVM_VOADDR_GET_UOBJ(voa) \
|
|
((struct uvm_object *)UVM_VOADDR_GET_OBJECT(voa))
|
|
#define UVM_VOADDR_SET_UOBJ(voa, uobj) \
|
|
UVM_VOADDR_SET_OBJECT(voa, uobj, UVM_VOADDR_TYPE_UOBJ)
|
|
|
|
#define UVM_VOADDR_GET_ANON(voa) \
|
|
((struct vm_anon *)UVM_VOADDR_GET_OBJECT(voa))
|
|
#define UVM_VOADDR_SET_ANON(voa, anon) \
|
|
UVM_VOADDR_SET_OBJECT(voa, anon, UVM_VOADDR_TYPE_ANON)
|
|
|
|
/*
|
|
* uvm_voaddr_acquire: returns the virtual object address corresponding
|
|
* to the specified virtual address.
|
|
*
|
|
* => resolves COW so the true page identity is tracked.
|
|
*
|
|
* => acquires a reference on the page's owner (uvm_object or vm_anon)
|
|
*/
|
|
bool
|
|
uvm_voaddr_acquire(struct vm_map * const map, vaddr_t const va,
|
|
struct uvm_voaddr * const voaddr)
|
|
{
|
|
struct vm_map_entry *entry;
|
|
struct vm_anon *anon = NULL;
|
|
bool result = false;
|
|
bool exclusive = false;
|
|
void (*unlock_fn)(struct vm_map *);
|
|
|
|
UVMHIST_FUNC(__func__); UVMHIST_CALLED(maphist);
|
|
UVMHIST_LOG(maphist,"(map=%#jx,va=%#jx)", (uintptr_t)map, va, 0, 0);
|
|
|
|
const vaddr_t start = trunc_page(va);
|
|
const vaddr_t end = round_page(va+1);
|
|
|
|
lookup_again:
|
|
if (__predict_false(exclusive)) {
|
|
vm_map_lock(map);
|
|
unlock_fn = vm_map_unlock;
|
|
} else {
|
|
vm_map_lock_read(map);
|
|
unlock_fn = vm_map_unlock_read;
|
|
}
|
|
|
|
if (__predict_false(!uvm_map_lookup_entry(map, start, &entry))) {
|
|
unlock_fn(map);
|
|
UVMHIST_LOG(maphist,"<- done (no entry)",0,0,0,0);
|
|
return false;
|
|
}
|
|
|
|
if (__predict_false(entry->protection == VM_PROT_NONE)) {
|
|
unlock_fn(map);
|
|
UVMHIST_LOG(maphist,"<- done (PROT_NONE)",0,0,0,0);
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* We have a fast path for the common case of "no COW resolution
|
|
* needed" whereby we have taken a read lock on the map and if
|
|
* we don't encounter any need to create a vm_anon then great!
|
|
* But if we do, we loop around again, instead taking an exclusive
|
|
* lock so that we can perform the fault.
|
|
*
|
|
* In the event that we have to resolve the fault, we do nearly the
|
|
* same work as uvm_map_pageable() does:
|
|
*
|
|
* 1: holding the write lock, we create any anonymous maps that need
|
|
* to be created. however, we do NOT need to clip the map entries
|
|
* in this case.
|
|
*
|
|
* 2: we downgrade to a read lock, and call uvm_fault_wire to fault
|
|
* in the page (assuming the entry is not already wired). this
|
|
* is done because we need the vm_anon to be present.
|
|
*/
|
|
if (__predict_true(!VM_MAPENT_ISWIRED(entry))) {
|
|
|
|
bool need_fault = false;
|
|
|
|
/*
|
|
* perform the action of vm_map_lookup that need the
|
|
* write lock on the map: create an anonymous map for
|
|
* a copy-on-write region, or an anonymous map for
|
|
* a zero-fill region.
|
|
*/
|
|
if (__predict_false(UVM_ET_ISSUBMAP(entry))) {
|
|
unlock_fn(map);
|
|
UVMHIST_LOG(maphist,"<- done (submap)",0,0,0,0);
|
|
return false;
|
|
}
|
|
if (__predict_false(UVM_ET_ISNEEDSCOPY(entry) &&
|
|
((entry->max_protection & VM_PROT_WRITE) ||
|
|
(entry->object.uvm_obj == NULL)))) {
|
|
if (!exclusive) {
|
|
/* need to take the slow path */
|
|
KASSERT(unlock_fn == vm_map_unlock_read);
|
|
vm_map_unlock_read(map);
|
|
exclusive = true;
|
|
goto lookup_again;
|
|
}
|
|
need_fault = true;
|
|
amap_copy(map, entry, 0, start, end);
|
|
/* XXXCDC: wait OK? */
|
|
}
|
|
|
|
/*
|
|
* do a quick check to see if the fault has already
|
|
* been resolved to the upper layer.
|
|
*/
|
|
if (__predict_true(entry->aref.ar_amap != NULL &&
|
|
need_fault == false)) {
|
|
amap_lock(entry->aref.ar_amap, RW_WRITER);
|
|
anon = amap_lookup(&entry->aref, start - entry->start);
|
|
if (__predict_true(anon != NULL)) {
|
|
/* amap unlocked below */
|
|
goto found_anon;
|
|
}
|
|
amap_unlock(entry->aref.ar_amap);
|
|
need_fault = true;
|
|
}
|
|
|
|
/*
|
|
* we predict this test as false because if we reach
|
|
* this point, then we are likely dealing with a
|
|
* shared memory region backed by a uvm_object, in
|
|
* which case a fault to create the vm_anon is not
|
|
* necessary.
|
|
*/
|
|
if (__predict_false(need_fault)) {
|
|
if (exclusive) {
|
|
vm_map_busy(map);
|
|
vm_map_unlock(map);
|
|
unlock_fn = vm_map_unbusy;
|
|
}
|
|
|
|
if (uvm_fault_wire(map, start, end,
|
|
entry->max_protection, 1)) {
|
|
/* wiring failed */
|
|
unlock_fn(map);
|
|
UVMHIST_LOG(maphist,"<- done (wire failed)",
|
|
0,0,0,0);
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* now that we have resolved the fault, we can unwire
|
|
* the page.
|
|
*/
|
|
if (exclusive) {
|
|
vm_map_lock(map);
|
|
vm_map_unbusy(map);
|
|
unlock_fn = vm_map_unlock;
|
|
}
|
|
|
|
uvm_fault_unwire_locked(map, start, end);
|
|
}
|
|
}
|
|
|
|
/* check the upper layer */
|
|
if (entry->aref.ar_amap) {
|
|
amap_lock(entry->aref.ar_amap, RW_WRITER);
|
|
anon = amap_lookup(&entry->aref, start - entry->start);
|
|
if (anon) {
|
|
found_anon: KASSERT(anon->an_lock == entry->aref.ar_amap->am_lock);
|
|
anon->an_ref++;
|
|
rw_obj_hold(anon->an_lock);
|
|
KASSERT(anon->an_ref != 0);
|
|
UVM_VOADDR_SET_ANON(voaddr, anon);
|
|
voaddr->offset = va & PAGE_MASK;
|
|
result = true;
|
|
}
|
|
amap_unlock(entry->aref.ar_amap);
|
|
}
|
|
|
|
/* check the lower layer */
|
|
if (!result && UVM_ET_ISOBJ(entry)) {
|
|
struct uvm_object *uobj = entry->object.uvm_obj;
|
|
|
|
KASSERT(uobj != NULL);
|
|
(*uobj->pgops->pgo_reference)(uobj);
|
|
UVM_VOADDR_SET_UOBJ(voaddr, uobj);
|
|
voaddr->offset = entry->offset + (va - entry->start);
|
|
result = true;
|
|
}
|
|
|
|
unlock_fn(map);
|
|
|
|
if (result) {
|
|
UVMHIST_LOG(maphist,
|
|
"<- done OK (type=%jd,owner=%#jx,offset=%#jx)",
|
|
UVM_VOADDR_GET_TYPE(voaddr),
|
|
UVM_VOADDR_GET_OBJECT(voaddr),
|
|
voaddr->offset, 0);
|
|
} else {
|
|
UVMHIST_LOG(maphist,"<- done (failed)",0,0,0,0);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* uvm_voaddr_release: release the references held by the
|
|
* vitual object address.
|
|
*/
|
|
void
|
|
uvm_voaddr_release(struct uvm_voaddr * const voaddr)
|
|
{
|
|
|
|
switch (UVM_VOADDR_GET_TYPE(voaddr)) {
|
|
case UVM_VOADDR_TYPE_UOBJ: {
|
|
struct uvm_object * const uobj = UVM_VOADDR_GET_UOBJ(voaddr);
|
|
|
|
KASSERT(uobj != NULL);
|
|
KASSERT(uobj->pgops->pgo_detach != NULL);
|
|
(*uobj->pgops->pgo_detach)(uobj);
|
|
break;
|
|
}
|
|
case UVM_VOADDR_TYPE_ANON: {
|
|
struct vm_anon * const anon = UVM_VOADDR_GET_ANON(voaddr);
|
|
krwlock_t *lock;
|
|
|
|
KASSERT(anon != NULL);
|
|
rw_enter((lock = anon->an_lock), RW_WRITER);
|
|
KASSERT(anon->an_ref > 0);
|
|
if (--anon->an_ref == 0) {
|
|
uvm_anfree(anon);
|
|
}
|
|
rw_exit(lock);
|
|
rw_obj_free(lock);
|
|
break;
|
|
}
|
|
default:
|
|
panic("uvm_voaddr_release: bad type");
|
|
}
|
|
memset(voaddr, 0, sizeof(*voaddr));
|
|
}
|
|
|
|
/*
|
|
* uvm_voaddr_compare: compare two uvm_voaddr objects.
|
|
*
|
|
* => memcmp() semantics
|
|
*/
|
|
int
|
|
uvm_voaddr_compare(const struct uvm_voaddr * const voaddr1,
|
|
const struct uvm_voaddr * const voaddr2)
|
|
{
|
|
const uintptr_t type1 = UVM_VOADDR_GET_TYPE(voaddr1);
|
|
const uintptr_t type2 = UVM_VOADDR_GET_TYPE(voaddr2);
|
|
|
|
KASSERT(type1 == UVM_VOADDR_TYPE_UOBJ ||
|
|
type1 == UVM_VOADDR_TYPE_ANON);
|
|
|
|
KASSERT(type2 == UVM_VOADDR_TYPE_UOBJ ||
|
|
type2 == UVM_VOADDR_TYPE_ANON);
|
|
|
|
if (type1 < type2)
|
|
return -1;
|
|
if (type1 > type2)
|
|
return 1;
|
|
|
|
const uintptr_t addr1 = UVM_VOADDR_GET_OBJECT(voaddr1);
|
|
const uintptr_t addr2 = UVM_VOADDR_GET_OBJECT(voaddr2);
|
|
|
|
if (addr1 < addr2)
|
|
return -1;
|
|
if (addr1 > addr2)
|
|
return 1;
|
|
|
|
if (voaddr1->offset < voaddr2->offset)
|
|
return -1;
|
|
if (voaddr1->offset > voaddr2->offset)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
#if defined(DDB) || defined(DEBUGPRINT)
|
|
|
|
/*
|
|
* uvm_map_printit: actually prints the map
|
|
*/
|
|
|
|
void
|
|
uvm_map_printit(struct vm_map *map, bool full,
|
|
void (*pr)(const char *, ...))
|
|
{
|
|
struct vm_map_entry *entry;
|
|
|
|
(*pr)("MAP %p: [%#lx->%#lx]\n", map, vm_map_min(map),
|
|
vm_map_max(map));
|
|
(*pr)("\t#ent=%d, sz=%d, ref=%d, version=%d, flags=%#x\n",
|
|
map->nentries, map->size, map->ref_count, map->timestamp,
|
|
map->flags);
|
|
(*pr)("\tpmap=%p(resident=%ld, wired=%ld)\n", map->pmap,
|
|
pmap_resident_count(map->pmap), pmap_wired_count(map->pmap));
|
|
if (!full)
|
|
return;
|
|
for (entry = map->header.next; entry != &map->header;
|
|
entry = entry->next) {
|
|
(*pr)(" - %p: %#lx->%#lx: obj=%p/%#llx, amap=%p/%d\n",
|
|
entry, entry->start, entry->end, entry->object.uvm_obj,
|
|
(long long)entry->offset, entry->aref.ar_amap,
|
|
entry->aref.ar_pageoff);
|
|
(*pr)(
|
|
"\tsubmap=%c, cow=%c, nc=%c, prot(max)=%d/%d, inh=%d, "
|
|
"wc=%d, adv=%d%s\n",
|
|
(entry->etype & UVM_ET_SUBMAP) ? 'T' : 'F',
|
|
(entry->etype & UVM_ET_COPYONWRITE) ? 'T' : 'F',
|
|
(entry->etype & UVM_ET_NEEDSCOPY) ? 'T' : 'F',
|
|
entry->protection, entry->max_protection,
|
|
entry->inheritance, entry->wired_count, entry->advice,
|
|
entry == map->first_free ? " (first_free)" : "");
|
|
}
|
|
}
|
|
|
|
void
|
|
uvm_whatis(uintptr_t addr, void (*pr)(const char *, ...))
|
|
{
|
|
struct vm_map *map;
|
|
|
|
for (map = kernel_map;;) {
|
|
struct vm_map_entry *entry;
|
|
|
|
if (!uvm_map_lookup_entry_bytree(map, (vaddr_t)addr, &entry)) {
|
|
break;
|
|
}
|
|
(*pr)("%p is %p+%zu from VMMAP %p\n",
|
|
(void *)addr, (void *)entry->start,
|
|
(size_t)(addr - (uintptr_t)entry->start), map);
|
|
if (!UVM_ET_ISSUBMAP(entry)) {
|
|
break;
|
|
}
|
|
map = entry->object.sub_map;
|
|
}
|
|
}
|
|
|
|
#endif /* DDB || DEBUGPRINT */
|
|
|
|
#ifndef __USER_VA0_IS_SAFE
|
|
static int
|
|
sysctl_user_va0_disable(SYSCTLFN_ARGS)
|
|
{
|
|
struct sysctlnode node;
|
|
int t, error;
|
|
|
|
node = *rnode;
|
|
node.sysctl_data = &t;
|
|
t = user_va0_disable;
|
|
error = sysctl_lookup(SYSCTLFN_CALL(&node));
|
|
if (error || newp == NULL)
|
|
return (error);
|
|
|
|
if (!t && user_va0_disable &&
|
|
kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MAP_VA_ZERO, 0,
|
|
NULL, NULL, NULL))
|
|
return EPERM;
|
|
|
|
user_va0_disable = !!t;
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int
|
|
fill_vmentry(struct lwp *l, struct proc *p, struct kinfo_vmentry *kve,
|
|
struct vm_map *m, struct vm_map_entry *e)
|
|
{
|
|
#ifndef _RUMPKERNEL
|
|
int error;
|
|
|
|
memset(kve, 0, sizeof(*kve));
|
|
KASSERT(e != NULL);
|
|
if (UVM_ET_ISOBJ(e)) {
|
|
struct uvm_object *uobj = e->object.uvm_obj;
|
|
KASSERT(uobj != NULL);
|
|
kve->kve_ref_count = uobj->uo_refs;
|
|
kve->kve_count = uobj->uo_npages;
|
|
if (UVM_OBJ_IS_VNODE(uobj)) {
|
|
struct vattr va;
|
|
struct vnode *vp = (struct vnode *)uobj;
|
|
vn_lock(vp, LK_SHARED | LK_RETRY);
|
|
error = VOP_GETATTR(vp, &va, l->l_cred);
|
|
VOP_UNLOCK(vp);
|
|
kve->kve_type = KVME_TYPE_VNODE;
|
|
if (error == 0) {
|
|
kve->kve_vn_size = vp->v_size;
|
|
kve->kve_vn_type = (int)vp->v_type;
|
|
kve->kve_vn_mode = va.va_mode;
|
|
kve->kve_vn_rdev = va.va_rdev;
|
|
kve->kve_vn_fileid = va.va_fileid;
|
|
kve->kve_vn_fsid = va.va_fsid;
|
|
error = vnode_to_path(kve->kve_path,
|
|
sizeof(kve->kve_path) / 2, vp, l, p);
|
|
}
|
|
} else if (UVM_OBJ_IS_KERN_OBJECT(uobj)) {
|
|
kve->kve_type = KVME_TYPE_KERN;
|
|
} else if (UVM_OBJ_IS_DEVICE(uobj)) {
|
|
kve->kve_type = KVME_TYPE_DEVICE;
|
|
} else if (UVM_OBJ_IS_AOBJ(uobj)) {
|
|
kve->kve_type = KVME_TYPE_ANON;
|
|
} else {
|
|
kve->kve_type = KVME_TYPE_OBJECT;
|
|
}
|
|
} else if (UVM_ET_ISSUBMAP(e)) {
|
|
struct vm_map *map = e->object.sub_map;
|
|
KASSERT(map != NULL);
|
|
kve->kve_ref_count = map->ref_count;
|
|
kve->kve_count = map->nentries;
|
|
kve->kve_type = KVME_TYPE_SUBMAP;
|
|
} else
|
|
kve->kve_type = KVME_TYPE_UNKNOWN;
|
|
|
|
kve->kve_start = e->start;
|
|
kve->kve_end = e->end;
|
|
kve->kve_offset = e->offset;
|
|
kve->kve_wired_count = e->wired_count;
|
|
kve->kve_inheritance = e->inheritance;
|
|
kve->kve_attributes = 0; /* unused */
|
|
kve->kve_advice = e->advice;
|
|
#define PROT(p) (((p) & VM_PROT_READ) ? KVME_PROT_READ : 0) | \
|
|
(((p) & VM_PROT_WRITE) ? KVME_PROT_WRITE : 0) | \
|
|
(((p) & VM_PROT_EXECUTE) ? KVME_PROT_EXEC : 0)
|
|
kve->kve_protection = PROT(e->protection);
|
|
kve->kve_max_protection = PROT(e->max_protection);
|
|
kve->kve_flags |= (e->etype & UVM_ET_COPYONWRITE)
|
|
? KVME_FLAG_COW : 0;
|
|
kve->kve_flags |= (e->etype & UVM_ET_NEEDSCOPY)
|
|
? KVME_FLAG_NEEDS_COPY : 0;
|
|
kve->kve_flags |= (m->flags & VM_MAP_TOPDOWN)
|
|
? KVME_FLAG_GROWS_DOWN : KVME_FLAG_GROWS_UP;
|
|
kve->kve_flags |= (m->flags & VM_MAP_PAGEABLE)
|
|
? KVME_FLAG_PAGEABLE : 0;
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
fill_vmentries(struct lwp *l, pid_t pid, u_int elem_size, void *oldp,
|
|
size_t *oldlenp)
|
|
{
|
|
int error;
|
|
struct proc *p;
|
|
struct kinfo_vmentry *vme;
|
|
struct vmspace *vm;
|
|
struct vm_map *map;
|
|
struct vm_map_entry *entry;
|
|
char *dp;
|
|
size_t count, vmesize;
|
|
|
|
if (elem_size == 0 || elem_size > 2 * sizeof(*vme))
|
|
return EINVAL;
|
|
|
|
if (oldp) {
|
|
if (*oldlenp > 10UL * 1024UL * 1024UL)
|
|
return E2BIG;
|
|
count = *oldlenp / elem_size;
|
|
if (count == 0)
|
|
return ENOMEM;
|
|
vmesize = count * sizeof(*vme);
|
|
} else
|
|
vmesize = 0;
|
|
|
|
if ((error = proc_find_locked(l, &p, pid)) != 0)
|
|
return error;
|
|
|
|
vme = NULL;
|
|
count = 0;
|
|
|
|
if ((error = proc_vmspace_getref(p, &vm)) != 0)
|
|
goto out;
|
|
|
|
map = &vm->vm_map;
|
|
vm_map_lock_read(map);
|
|
|
|
dp = oldp;
|
|
if (oldp)
|
|
vme = kmem_alloc(vmesize, KM_SLEEP);
|
|
for (entry = map->header.next; entry != &map->header;
|
|
entry = entry->next) {
|
|
if (oldp && (dp - (char *)oldp) < vmesize) {
|
|
error = fill_vmentry(l, p, &vme[count], map, entry);
|
|
if (error)
|
|
goto out;
|
|
dp += elem_size;
|
|
}
|
|
count++;
|
|
}
|
|
vm_map_unlock_read(map);
|
|
uvmspace_free(vm);
|
|
|
|
out:
|
|
if (pid != -1)
|
|
mutex_exit(p->p_lock);
|
|
if (error == 0) {
|
|
const u_int esize = uimin(sizeof(*vme), elem_size);
|
|
dp = oldp;
|
|
for (size_t i = 0; i < count; i++) {
|
|
if (oldp && (dp - (char *)oldp) < vmesize) {
|
|
error = sysctl_copyout(l, &vme[i], dp, esize);
|
|
if (error)
|
|
break;
|
|
dp += elem_size;
|
|
} else
|
|
break;
|
|
}
|
|
count *= elem_size;
|
|
if (oldp != NULL && *oldlenp < count)
|
|
error = ENOSPC;
|
|
*oldlenp = count;
|
|
}
|
|
if (vme)
|
|
kmem_free(vme, vmesize);
|
|
return error;
|
|
}
|
|
|
|
static int
|
|
sysctl_vmproc(SYSCTLFN_ARGS)
|
|
{
|
|
int error;
|
|
|
|
if (namelen == 1 && name[0] == CTL_QUERY)
|
|
return (sysctl_query(SYSCTLFN_CALL(rnode)));
|
|
|
|
if (namelen == 0)
|
|
return EINVAL;
|
|
|
|
switch (name[0]) {
|
|
case VM_PROC_MAP:
|
|
if (namelen != 3)
|
|
return EINVAL;
|
|
sysctl_unlock();
|
|
error = fill_vmentries(l, name[1], name[2], oldp, oldlenp);
|
|
sysctl_relock();
|
|
return error;
|
|
default:
|
|
return EINVAL;
|
|
}
|
|
}
|
|
|
|
SYSCTL_SETUP(sysctl_uvmmap_setup, "sysctl uvmmap setup")
|
|
{
|
|
|
|
sysctl_createv(clog, 0, NULL, NULL,
|
|
CTLFLAG_PERMANENT,
|
|
CTLTYPE_STRUCT, "proc",
|
|
SYSCTL_DESCR("Process vm information"),
|
|
sysctl_vmproc, 0, NULL, 0,
|
|
CTL_VM, VM_PROC, CTL_EOL);
|
|
#ifndef __USER_VA0_IS_SAFE
|
|
sysctl_createv(clog, 0, NULL, NULL,
|
|
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
|
|
CTLTYPE_INT, "user_va0_disable",
|
|
SYSCTL_DESCR("Disable VA 0"),
|
|
sysctl_user_va0_disable, 0, &user_va0_disable, 0,
|
|
CTL_VM, CTL_CREATE, CTL_EOL);
|
|
#endif
|
|
}
|