1da427a80a
value (KERN_SUCCESS or KERN_RESOURCE_SHORTAGE) indicating if it succeeded or failed. Change the `wired' and `access_type' arguments to a single `flags' argument, which includes the access type, and flags: PMAP_WIRED the old `wired' boolean PMAP_CANFAIL pmap_enter() is allowed to fail If PMAP_CANFAIL is not specified, the pmap should behave as it always has in the face of a drastic resource shortage: fall over dead. Change the fault handler to deal with failure (which indicates resource shortage) by unlocking everything, waiting for the pagedaemon to free more memory, then retrying the fault.
946 lines
26 KiB
C
946 lines
26 KiB
C
/* $NetBSD: uvm_km.c,v 1.33 1999/11/13 00:24:38 thorpej Exp $ */
|
|
|
|
/*
|
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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
|
|
* 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
|
|
* 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
|
|
* documentation and/or other materials provided with the distribution.
|
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* 3. All advertising materials mentioning features or use of this software
|
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* must display the following acknowledgement:
|
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* This product includes software developed by Charles D. Cranor,
|
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* Washington University, the University of California, Berkeley and
|
|
* its contributors.
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* 4. Neither the name of the University nor the names of its contributors
|
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* may be used to endorse or promote products derived from this software
|
|
* 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
|
|
* 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_kern.c 8.3 (Berkeley) 1/12/94
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* from: Id: uvm_km.c,v 1.1.2.14 1998/02/06 05:19:27 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
|
|
* its documentation is hereby granted, provided that both the copyright
|
|
* notice and this permission notice appear in all copies of the
|
|
* software, derivative works or modified versions, and any portions
|
|
* thereof, and that both notices appear in supporting documentation.
|
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*
|
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
|
|
* 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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*
|
|
* 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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#include "opt_uvmhist.h"
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|
|
|
/*
|
|
* uvm_km.c: handle kernel memory allocation and management
|
|
*/
|
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|
|
/*
|
|
* overview of kernel memory management:
|
|
*
|
|
* the kernel virtual address space is mapped by "kernel_map." kernel_map
|
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* starts at VM_MIN_KERNEL_ADDRESS and goes to VM_MAX_KERNEL_ADDRESS.
|
|
* note that VM_MIN_KERNEL_ADDRESS is equal to vm_map_min(kernel_map).
|
|
*
|
|
* the kernel_map has several "submaps." submaps can only appear in
|
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* the kernel_map (user processes can't use them). submaps "take over"
|
|
* the management of a sub-range of the kernel's address space. submaps
|
|
* are typically allocated at boot time and are never released. kernel
|
|
* virtual address space that is mapped by a submap is locked by the
|
|
* submap's lock -- not the kernel_map's lock.
|
|
*
|
|
* thus, the useful feature of submaps is that they allow us to break
|
|
* up the locking and protection of the kernel address space into smaller
|
|
* chunks.
|
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*
|
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* the vm system has several standard kernel submaps, including:
|
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* kmem_map => contains only wired kernel memory for the kernel
|
|
* malloc. *** access to kmem_map must be protected
|
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* by splimp() because we are allowed to call malloc()
|
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* at interrupt time ***
|
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* mb_map => memory for large mbufs, *** protected by splimp ***
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* pager_map => used to map "buf" structures into kernel space
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* exec_map => used during exec to handle exec args
|
|
* etc...
|
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*
|
|
* the kernel allocates its private memory out of special uvm_objects whose
|
|
* reference count is set to UVM_OBJ_KERN (thus indicating that the objects
|
|
* are "special" and never die). all kernel objects should be thought of
|
|
* as large, fixed-sized, sparsely populated uvm_objects. each kernel
|
|
* object is equal to the size of kernel virtual address space (i.e. the
|
|
* value "VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS").
|
|
*
|
|
* most kernel private memory lives in kernel_object. the only exception
|
|
* to this is for memory that belongs to submaps that must be protected
|
|
* by splimp(). each of these submaps has their own private kernel
|
|
* object (e.g. kmem_object, mb_object).
|
|
*
|
|
* note that just because a kernel object spans the entire kernel virutal
|
|
* address space doesn't mean that it has to be mapped into the entire space.
|
|
* large chunks of a kernel object's space go unused either because
|
|
* that area of kernel VM is unmapped, or there is some other type of
|
|
* object mapped into that range (e.g. a vnode). for submap's kernel
|
|
* objects, the only part of the object that can ever be populated is the
|
|
* offsets that are managed by the submap.
|
|
*
|
|
* note that the "offset" in a kernel object is always the kernel virtual
|
|
* address minus the VM_MIN_KERNEL_ADDRESS (aka vm_map_min(kernel_map)).
|
|
* example:
|
|
* suppose VM_MIN_KERNEL_ADDRESS is 0xf8000000 and the kernel does a
|
|
* uvm_km_alloc(kernel_map, PAGE_SIZE) [allocate 1 wired down page in the
|
|
* kernel map]. if uvm_km_alloc returns virtual address 0xf8235000,
|
|
* then that means that the page at offset 0x235000 in kernel_object is
|
|
* mapped at 0xf8235000.
|
|
*
|
|
* note that the offsets in kmem_object and mb_object also follow this
|
|
* rule. this means that the offsets for kmem_object must fall in the
|
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* range of [vm_map_min(kmem_object) - vm_map_min(kernel_map)] to
|
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* [vm_map_max(kmem_object) - vm_map_min(kernel_map)], so the offsets
|
|
* in those objects will typically not start at zero.
|
|
*
|
|
* kernel object have one other special property: when the kernel virtual
|
|
* memory mapping them is unmapped, the backing memory in the object is
|
|
* freed right away. this is done with the uvm_km_pgremove() function.
|
|
* this has to be done because there is no backing store for kernel pages
|
|
* and no need to save them after they are no longer referenced.
|
|
*/
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|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
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|
#include <sys/proc.h>
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|
|
#include <vm/vm.h>
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|
#include <vm/vm_page.h>
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#include <vm/vm_kern.h>
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|
|
|
#include <uvm/uvm.h>
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|
|
|
/*
|
|
* global data structures
|
|
*/
|
|
|
|
vm_map_t kernel_map = NULL;
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|
|
|
struct vmi_list vmi_list;
|
|
simple_lock_data_t vmi_list_slock;
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|
|
|
/*
|
|
* local data structues
|
|
*/
|
|
|
|
static struct vm_map kernel_map_store;
|
|
static struct uvm_object kmem_object_store;
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|
static struct uvm_object mb_object_store;
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|
|
|
/*
|
|
* All pager operations here are NULL, but the object must have
|
|
* a pager ops vector associated with it; various places assume
|
|
* it to be so.
|
|
*/
|
|
static struct uvm_pagerops km_pager;
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|
|
|
/*
|
|
* uvm_km_init: init kernel maps and objects to reflect reality (i.e.
|
|
* KVM already allocated for text, data, bss, and static data structures).
|
|
*
|
|
* => KVM is defined by VM_MIN_KERNEL_ADDRESS/VM_MAX_KERNEL_ADDRESS.
|
|
* we assume that [min -> start] has already been allocated and that
|
|
* "end" is the end.
|
|
*/
|
|
|
|
void
|
|
uvm_km_init(start, end)
|
|
vaddr_t start, end;
|
|
{
|
|
vaddr_t base = VM_MIN_KERNEL_ADDRESS;
|
|
|
|
/*
|
|
* first, initialize the interrupt-safe map list.
|
|
*/
|
|
LIST_INIT(&vmi_list);
|
|
simple_lock_init(&vmi_list_slock);
|
|
|
|
/*
|
|
* next, init kernel memory objects.
|
|
*/
|
|
|
|
/* kernel_object: for pageable anonymous kernel memory */
|
|
uvm.kernel_object = uao_create(VM_MAX_KERNEL_ADDRESS -
|
|
VM_MIN_KERNEL_ADDRESS, UAO_FLAG_KERNOBJ);
|
|
|
|
/*
|
|
* kmem_object: for use by the kernel malloc(). Memory is always
|
|
* wired, and this object (and the kmem_map) can be accessed at
|
|
* interrupt time.
|
|
*/
|
|
simple_lock_init(&kmem_object_store.vmobjlock);
|
|
kmem_object_store.pgops = &km_pager;
|
|
TAILQ_INIT(&kmem_object_store.memq);
|
|
kmem_object_store.uo_npages = 0;
|
|
/* we are special. we never die */
|
|
kmem_object_store.uo_refs = UVM_OBJ_KERN_INTRSAFE;
|
|
uvmexp.kmem_object = &kmem_object_store;
|
|
|
|
/*
|
|
* mb_object: for mbuf cluster pages on platforms which use the
|
|
* mb_map. Memory is always wired, and this object (and the mb_map)
|
|
* can be accessed at interrupt time.
|
|
*/
|
|
simple_lock_init(&mb_object_store.vmobjlock);
|
|
mb_object_store.pgops = &km_pager;
|
|
TAILQ_INIT(&mb_object_store.memq);
|
|
mb_object_store.uo_npages = 0;
|
|
/* we are special. we never die */
|
|
mb_object_store.uo_refs = UVM_OBJ_KERN_INTRSAFE;
|
|
uvmexp.mb_object = &mb_object_store;
|
|
|
|
/*
|
|
* init the map and reserve allready allocated kernel space
|
|
* before installing.
|
|
*/
|
|
|
|
uvm_map_setup(&kernel_map_store, base, end, VM_MAP_PAGEABLE);
|
|
kernel_map_store.pmap = pmap_kernel();
|
|
if (uvm_map(&kernel_map_store, &base, start - base, NULL,
|
|
UVM_UNKNOWN_OFFSET, UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL,
|
|
UVM_INH_NONE, UVM_ADV_RANDOM,UVM_FLAG_FIXED)) != KERN_SUCCESS)
|
|
panic("uvm_km_init: could not reserve space for kernel");
|
|
|
|
/*
|
|
* install!
|
|
*/
|
|
|
|
kernel_map = &kernel_map_store;
|
|
}
|
|
|
|
/*
|
|
* uvm_km_suballoc: allocate a submap in the kernel map. once a submap
|
|
* is allocated all references to that area of VM must go through it. this
|
|
* allows the locking of VAs in kernel_map to be broken up into regions.
|
|
*
|
|
* => if `fixed' is true, *min specifies where the region described
|
|
* by the submap must start
|
|
* => if submap is non NULL we use that as the submap, otherwise we
|
|
* alloc a new map
|
|
*/
|
|
struct vm_map *
|
|
uvm_km_suballoc(map, min, max, size, flags, fixed, submap)
|
|
struct vm_map *map;
|
|
vaddr_t *min, *max; /* OUT, OUT */
|
|
vsize_t size;
|
|
int flags;
|
|
boolean_t fixed;
|
|
struct vm_map *submap;
|
|
{
|
|
int mapflags = UVM_FLAG_NOMERGE | (fixed ? UVM_FLAG_FIXED : 0);
|
|
|
|
size = round_page(size); /* round up to pagesize */
|
|
|
|
/*
|
|
* first allocate a blank spot in the parent map
|
|
*/
|
|
|
|
if (uvm_map(map, min, size, NULL, UVM_UNKNOWN_OFFSET,
|
|
UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_NONE,
|
|
UVM_ADV_RANDOM, mapflags)) != KERN_SUCCESS) {
|
|
panic("uvm_km_suballoc: unable to allocate space in parent map");
|
|
}
|
|
|
|
/*
|
|
* set VM bounds (min is filled in by uvm_map)
|
|
*/
|
|
|
|
*max = *min + size;
|
|
|
|
/*
|
|
* add references to pmap and create or init the submap
|
|
*/
|
|
|
|
pmap_reference(vm_map_pmap(map));
|
|
if (submap == NULL) {
|
|
submap = uvm_map_create(vm_map_pmap(map), *min, *max, flags);
|
|
if (submap == NULL)
|
|
panic("uvm_km_suballoc: unable to create submap");
|
|
} else {
|
|
uvm_map_setup(submap, *min, *max, flags);
|
|
submap->pmap = vm_map_pmap(map);
|
|
}
|
|
|
|
/*
|
|
* now let uvm_map_submap plug in it...
|
|
*/
|
|
|
|
if (uvm_map_submap(map, *min, *max, submap) != KERN_SUCCESS)
|
|
panic("uvm_km_suballoc: submap allocation failed");
|
|
|
|
return(submap);
|
|
}
|
|
|
|
/*
|
|
* uvm_km_pgremove: remove pages from a kernel uvm_object.
|
|
*
|
|
* => when you unmap a part of anonymous kernel memory you want to toss
|
|
* the pages right away. (this gets called from uvm_unmap_...).
|
|
*/
|
|
|
|
#define UKM_HASH_PENALTY 4 /* a guess */
|
|
|
|
void
|
|
uvm_km_pgremove(uobj, start, end)
|
|
struct uvm_object *uobj;
|
|
vaddr_t start, end;
|
|
{
|
|
boolean_t by_list;
|
|
struct vm_page *pp, *ppnext;
|
|
vaddr_t curoff;
|
|
UVMHIST_FUNC("uvm_km_pgremove"); UVMHIST_CALLED(maphist);
|
|
|
|
simple_lock(&uobj->vmobjlock); /* lock object */
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (uobj->pgops != &aobj_pager)
|
|
panic("uvm_km_pgremove: object %p not an aobj", uobj);
|
|
#endif
|
|
|
|
/* choose cheapest traversal */
|
|
by_list = (uobj->uo_npages <=
|
|
((end - start) >> PAGE_SHIFT) * UKM_HASH_PENALTY);
|
|
|
|
if (by_list)
|
|
goto loop_by_list;
|
|
|
|
/* by hash */
|
|
|
|
for (curoff = start ; curoff < end ; curoff += PAGE_SIZE) {
|
|
pp = uvm_pagelookup(uobj, curoff);
|
|
if (pp == NULL)
|
|
continue;
|
|
|
|
UVMHIST_LOG(maphist," page 0x%x, busy=%d", pp,
|
|
pp->flags & PG_BUSY, 0, 0);
|
|
|
|
/* now do the actual work */
|
|
if (pp->flags & PG_BUSY) {
|
|
/* owner must check for this when done */
|
|
pp->flags |= PG_RELEASED;
|
|
} else {
|
|
/* free the swap slot... */
|
|
uao_dropswap(uobj, curoff >> PAGE_SHIFT);
|
|
|
|
/*
|
|
* ...and free the page; note it may be on the
|
|
* active or inactive queues.
|
|
*/
|
|
uvm_lock_pageq();
|
|
uvm_pagefree(pp);
|
|
uvm_unlock_pageq();
|
|
}
|
|
/* done */
|
|
}
|
|
simple_unlock(&uobj->vmobjlock);
|
|
return;
|
|
|
|
loop_by_list:
|
|
|
|
for (pp = uobj->memq.tqh_first ; pp != NULL ; pp = ppnext) {
|
|
ppnext = pp->listq.tqe_next;
|
|
if (pp->offset < start || pp->offset >= end) {
|
|
continue;
|
|
}
|
|
|
|
UVMHIST_LOG(maphist," page 0x%x, busy=%d", pp,
|
|
pp->flags & PG_BUSY, 0, 0);
|
|
|
|
/* now do the actual work */
|
|
if (pp->flags & PG_BUSY) {
|
|
/* owner must check for this when done */
|
|
pp->flags |= PG_RELEASED;
|
|
} else {
|
|
/* free the swap slot... */
|
|
uao_dropswap(uobj, pp->offset >> PAGE_SHIFT);
|
|
|
|
/*
|
|
* ...and free the page; note it may be on the
|
|
* active or inactive queues.
|
|
*/
|
|
uvm_lock_pageq();
|
|
uvm_pagefree(pp);
|
|
uvm_unlock_pageq();
|
|
}
|
|
/* done */
|
|
}
|
|
simple_unlock(&uobj->vmobjlock);
|
|
return;
|
|
}
|
|
|
|
|
|
/*
|
|
* uvm_km_pgremove_intrsafe: like uvm_km_pgremove(), but for "intrsafe"
|
|
* objects
|
|
*
|
|
* => when you unmap a part of anonymous kernel memory you want to toss
|
|
* the pages right away. (this gets called from uvm_unmap_...).
|
|
* => none of the pages will ever be busy, and none of them will ever
|
|
* be on the active or inactive queues (because these objects are
|
|
* never allowed to "page").
|
|
*/
|
|
|
|
void
|
|
uvm_km_pgremove_intrsafe(uobj, start, end)
|
|
struct uvm_object *uobj;
|
|
vaddr_t start, end;
|
|
{
|
|
boolean_t by_list;
|
|
struct vm_page *pp, *ppnext;
|
|
vaddr_t curoff;
|
|
UVMHIST_FUNC("uvm_km_pgremove_intrsafe"); UVMHIST_CALLED(maphist);
|
|
|
|
simple_lock(&uobj->vmobjlock); /* lock object */
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (UVM_OBJ_IS_INTRSAFE_OBJECT(uobj) == 0)
|
|
panic("uvm_km_pgremove_intrsafe: object %p not intrsafe", uobj);
|
|
#endif
|
|
|
|
/* choose cheapest traversal */
|
|
by_list = (uobj->uo_npages <=
|
|
((end - start) >> PAGE_SHIFT) * UKM_HASH_PENALTY);
|
|
|
|
if (by_list)
|
|
goto loop_by_list;
|
|
|
|
/* by hash */
|
|
|
|
for (curoff = start ; curoff < end ; curoff += PAGE_SIZE) {
|
|
pp = uvm_pagelookup(uobj, curoff);
|
|
if (pp == NULL)
|
|
continue;
|
|
|
|
UVMHIST_LOG(maphist," page 0x%x, busy=%d", pp,
|
|
pp->flags & PG_BUSY, 0, 0);
|
|
#ifdef DIAGNOSTIC
|
|
if (pp->flags & PG_BUSY)
|
|
panic("uvm_km_pgremove_intrsafe: busy page");
|
|
if (pp->pqflags & PQ_ACTIVE)
|
|
panic("uvm_km_pgremove_intrsafe: active page");
|
|
if (pp->pqflags & PQ_INACTIVE)
|
|
panic("uvm_km_pgremove_intrsafe: inactive page");
|
|
#endif
|
|
|
|
/* free the page */
|
|
uvm_pagefree(pp);
|
|
}
|
|
simple_unlock(&uobj->vmobjlock);
|
|
return;
|
|
|
|
loop_by_list:
|
|
|
|
for (pp = uobj->memq.tqh_first ; pp != NULL ; pp = ppnext) {
|
|
ppnext = pp->listq.tqe_next;
|
|
if (pp->offset < start || pp->offset >= end) {
|
|
continue;
|
|
}
|
|
|
|
UVMHIST_LOG(maphist," page 0x%x, busy=%d", pp,
|
|
pp->flags & PG_BUSY, 0, 0);
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (pp->flags & PG_BUSY)
|
|
panic("uvm_km_pgremove_intrsafe: busy page");
|
|
if (pp->pqflags & PQ_ACTIVE)
|
|
panic("uvm_km_pgremove_intrsafe: active page");
|
|
if (pp->pqflags & PQ_INACTIVE)
|
|
panic("uvm_km_pgremove_intrsafe: inactive page");
|
|
#endif
|
|
|
|
/* free the page */
|
|
uvm_pagefree(pp);
|
|
}
|
|
simple_unlock(&uobj->vmobjlock);
|
|
return;
|
|
}
|
|
|
|
|
|
/*
|
|
* uvm_km_kmemalloc: lower level kernel memory allocator for malloc()
|
|
*
|
|
* => we map wired memory into the specified map using the obj passed in
|
|
* => NOTE: we can return NULL even if we can wait if there is not enough
|
|
* free VM space in the map... caller should be prepared to handle
|
|
* this case.
|
|
* => we return KVA of memory allocated
|
|
* => flags: NOWAIT, VALLOC - just allocate VA, TRYLOCK - fail if we can't
|
|
* lock the map
|
|
*/
|
|
|
|
vaddr_t
|
|
uvm_km_kmemalloc(map, obj, size, flags)
|
|
vm_map_t map;
|
|
struct uvm_object *obj;
|
|
vsize_t size;
|
|
int flags;
|
|
{
|
|
vaddr_t kva, loopva;
|
|
vaddr_t offset;
|
|
struct vm_page *pg;
|
|
UVMHIST_FUNC("uvm_km_kmemalloc"); UVMHIST_CALLED(maphist);
|
|
|
|
|
|
UVMHIST_LOG(maphist," (map=0x%x, obj=0x%x, size=0x%x, flags=%d)",
|
|
map, obj, size, flags);
|
|
#ifdef DIAGNOSTIC
|
|
/* sanity check */
|
|
if (vm_map_pmap(map) != pmap_kernel())
|
|
panic("uvm_km_kmemalloc: invalid map");
|
|
#endif
|
|
|
|
/*
|
|
* setup for call
|
|
*/
|
|
|
|
size = round_page(size);
|
|
kva = vm_map_min(map); /* hint */
|
|
|
|
/*
|
|
* allocate some virtual space
|
|
*/
|
|
|
|
if (uvm_map(map, &kva, size, obj, UVM_UNKNOWN_OFFSET,
|
|
UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_NONE,
|
|
UVM_ADV_RANDOM, (flags & UVM_KMF_TRYLOCK)))
|
|
!= KERN_SUCCESS) {
|
|
UVMHIST_LOG(maphist, "<- done (no VM)",0,0,0,0);
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* if all we wanted was VA, return now
|
|
*/
|
|
|
|
if (flags & UVM_KMF_VALLOC) {
|
|
UVMHIST_LOG(maphist,"<- done valloc (kva=0x%x)", kva,0,0,0);
|
|
return(kva);
|
|
}
|
|
/*
|
|
* recover object offset from virtual address
|
|
*/
|
|
|
|
offset = kva - vm_map_min(kernel_map);
|
|
UVMHIST_LOG(maphist, " kva=0x%x, offset=0x%x", kva, offset,0,0);
|
|
|
|
/*
|
|
* now allocate and map in the memory... note that we are the only ones
|
|
* whom should ever get a handle on this area of VM.
|
|
*/
|
|
|
|
loopva = kva;
|
|
while (size) {
|
|
simple_lock(&obj->vmobjlock);
|
|
pg = uvm_pagealloc(obj, offset, NULL, 0);
|
|
if (pg) {
|
|
pg->flags &= ~PG_BUSY; /* new page */
|
|
UVM_PAGE_OWN(pg, NULL);
|
|
}
|
|
simple_unlock(&obj->vmobjlock);
|
|
|
|
/*
|
|
* out of memory?
|
|
*/
|
|
|
|
if (pg == NULL) {
|
|
if (flags & UVM_KMF_NOWAIT) {
|
|
/* free everything! */
|
|
uvm_unmap(map, kva, kva + size);
|
|
return(0);
|
|
} else {
|
|
uvm_wait("km_getwait2"); /* sleep here */
|
|
continue;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* map it in: note that we call pmap_enter with the map and
|
|
* object unlocked in case we are kmem_map/kmem_object
|
|
* (because if pmap_enter wants to allocate out of kmem_object
|
|
* it will need to lock it itself!)
|
|
*/
|
|
if (UVM_OBJ_IS_INTRSAFE_OBJECT(obj)) {
|
|
pmap_kenter_pa(loopva, VM_PAGE_TO_PHYS(pg),
|
|
VM_PROT_ALL);
|
|
} else {
|
|
pmap_enter(map->pmap, loopva, VM_PAGE_TO_PHYS(pg),
|
|
UVM_PROT_ALL,
|
|
PMAP_WIRED | VM_PROT_READ | VM_PROT_WRITE);
|
|
}
|
|
loopva += PAGE_SIZE;
|
|
offset += PAGE_SIZE;
|
|
size -= PAGE_SIZE;
|
|
}
|
|
|
|
UVMHIST_LOG(maphist,"<- done (kva=0x%x)", kva,0,0,0);
|
|
return(kva);
|
|
}
|
|
|
|
/*
|
|
* uvm_km_free: free an area of kernel memory
|
|
*/
|
|
|
|
void
|
|
uvm_km_free(map, addr, size)
|
|
vm_map_t map;
|
|
vaddr_t addr;
|
|
vsize_t size;
|
|
{
|
|
|
|
uvm_unmap(map, trunc_page(addr), round_page(addr+size));
|
|
}
|
|
|
|
/*
|
|
* uvm_km_free_wakeup: free an area of kernel memory and wake up
|
|
* anyone waiting for vm space.
|
|
*
|
|
* => XXX: "wanted" bit + unlock&wait on other end?
|
|
*/
|
|
|
|
void
|
|
uvm_km_free_wakeup(map, addr, size)
|
|
vm_map_t map;
|
|
vaddr_t addr;
|
|
vsize_t size;
|
|
{
|
|
vm_map_entry_t dead_entries;
|
|
|
|
vm_map_lock(map);
|
|
(void)uvm_unmap_remove(map, trunc_page(addr), round_page(addr+size),
|
|
&dead_entries);
|
|
wakeup(map);
|
|
vm_map_unlock(map);
|
|
|
|
if (dead_entries != NULL)
|
|
uvm_unmap_detach(dead_entries, 0);
|
|
}
|
|
|
|
/*
|
|
* uvm_km_alloc1: allocate wired down memory in the kernel map.
|
|
*
|
|
* => we can sleep if needed
|
|
*/
|
|
|
|
vaddr_t
|
|
uvm_km_alloc1(map, size, zeroit)
|
|
vm_map_t map;
|
|
vsize_t size;
|
|
boolean_t zeroit;
|
|
{
|
|
vaddr_t kva, loopva, offset;
|
|
struct vm_page *pg;
|
|
UVMHIST_FUNC("uvm_km_alloc1"); UVMHIST_CALLED(maphist);
|
|
|
|
UVMHIST_LOG(maphist,"(map=0x%x, size=0x%x)", map, size,0,0);
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (vm_map_pmap(map) != pmap_kernel())
|
|
panic("uvm_km_alloc1");
|
|
#endif
|
|
|
|
size = round_page(size);
|
|
kva = vm_map_min(map); /* hint */
|
|
|
|
/*
|
|
* allocate some virtual space
|
|
*/
|
|
|
|
if (uvm_map(map, &kva, size, uvm.kernel_object, UVM_UNKNOWN_OFFSET,
|
|
UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_NONE,
|
|
UVM_ADV_RANDOM, 0)) != KERN_SUCCESS) {
|
|
UVMHIST_LOG(maphist,"<- done (no VM)",0,0,0,0);
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* recover object offset from virtual address
|
|
*/
|
|
|
|
offset = kva - vm_map_min(kernel_map);
|
|
UVMHIST_LOG(maphist," kva=0x%x, offset=0x%x", kva, offset,0,0);
|
|
|
|
/*
|
|
* now allocate the memory. we must be careful about released pages.
|
|
*/
|
|
|
|
loopva = kva;
|
|
while (size) {
|
|
simple_lock(&uvm.kernel_object->vmobjlock);
|
|
pg = uvm_pagelookup(uvm.kernel_object, offset);
|
|
|
|
/*
|
|
* if we found a page in an unallocated region, it must be
|
|
* released
|
|
*/
|
|
if (pg) {
|
|
if ((pg->flags & PG_RELEASED) == 0)
|
|
panic("uvm_km_alloc1: non-released page");
|
|
pg->flags |= PG_WANTED;
|
|
UVM_UNLOCK_AND_WAIT(pg, &uvm.kernel_object->vmobjlock,
|
|
FALSE, "km_alloc", 0);
|
|
continue; /* retry */
|
|
}
|
|
|
|
/* allocate ram */
|
|
pg = uvm_pagealloc(uvm.kernel_object, offset, NULL, 0);
|
|
if (pg) {
|
|
pg->flags &= ~PG_BUSY; /* new page */
|
|
UVM_PAGE_OWN(pg, NULL);
|
|
}
|
|
simple_unlock(&uvm.kernel_object->vmobjlock);
|
|
if (pg == NULL) {
|
|
uvm_wait("km_alloc1w"); /* wait for memory */
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* map it in; note we're never called with an intrsafe
|
|
* object, so we always use regular old pmap_enter().
|
|
*/
|
|
pmap_enter(map->pmap, loopva, VM_PAGE_TO_PHYS(pg),
|
|
UVM_PROT_ALL, PMAP_WIRED | VM_PROT_READ | VM_PROT_WRITE);
|
|
|
|
loopva += PAGE_SIZE;
|
|
offset += PAGE_SIZE;
|
|
size -= PAGE_SIZE;
|
|
}
|
|
|
|
/*
|
|
* zero on request (note that "size" is now zero due to the above loop
|
|
* so we need to subtract kva from loopva to reconstruct the size).
|
|
*/
|
|
|
|
if (zeroit)
|
|
memset((caddr_t)kva, 0, loopva - kva);
|
|
|
|
UVMHIST_LOG(maphist,"<- done (kva=0x%x)", kva,0,0,0);
|
|
return(kva);
|
|
}
|
|
|
|
/*
|
|
* uvm_km_valloc: allocate zero-fill memory in the kernel's address space
|
|
*
|
|
* => memory is not allocated until fault time
|
|
*/
|
|
|
|
vaddr_t
|
|
uvm_km_valloc(map, size)
|
|
vm_map_t map;
|
|
vsize_t size;
|
|
{
|
|
vaddr_t kva;
|
|
UVMHIST_FUNC("uvm_km_valloc"); UVMHIST_CALLED(maphist);
|
|
|
|
UVMHIST_LOG(maphist, "(map=0x%x, size=0x%x)", map, size, 0,0);
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (vm_map_pmap(map) != pmap_kernel())
|
|
panic("uvm_km_valloc");
|
|
#endif
|
|
|
|
size = round_page(size);
|
|
kva = vm_map_min(map); /* hint */
|
|
|
|
/*
|
|
* allocate some virtual space. will be demand filled by kernel_object.
|
|
*/
|
|
|
|
if (uvm_map(map, &kva, size, uvm.kernel_object, UVM_UNKNOWN_OFFSET,
|
|
UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_NONE,
|
|
UVM_ADV_RANDOM, 0)) != KERN_SUCCESS) {
|
|
UVMHIST_LOG(maphist, "<- done (no VM)", 0,0,0,0);
|
|
return(0);
|
|
}
|
|
|
|
UVMHIST_LOG(maphist, "<- done (kva=0x%x)", kva,0,0,0);
|
|
return(kva);
|
|
}
|
|
|
|
/*
|
|
* uvm_km_valloc_wait: allocate zero-fill memory in the kernel's address space
|
|
*
|
|
* => memory is not allocated until fault time
|
|
* => if no room in map, wait for space to free, unless requested size
|
|
* is larger than map (in which case we return 0)
|
|
*/
|
|
|
|
vaddr_t
|
|
uvm_km_valloc_wait(map, size)
|
|
vm_map_t map;
|
|
vsize_t size;
|
|
{
|
|
vaddr_t kva;
|
|
UVMHIST_FUNC("uvm_km_valloc_wait"); UVMHIST_CALLED(maphist);
|
|
|
|
UVMHIST_LOG(maphist, "(map=0x%x, size=0x%x)", map, size, 0,0);
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (vm_map_pmap(map) != pmap_kernel())
|
|
panic("uvm_km_valloc_wait");
|
|
#endif
|
|
|
|
size = round_page(size);
|
|
if (size > vm_map_max(map) - vm_map_min(map))
|
|
return(0);
|
|
|
|
while (1) {
|
|
kva = vm_map_min(map); /* hint */
|
|
|
|
/*
|
|
* allocate some virtual space. will be demand filled
|
|
* by kernel_object.
|
|
*/
|
|
|
|
if (uvm_map(map, &kva, size, uvm.kernel_object,
|
|
UVM_UNKNOWN_OFFSET, UVM_MAPFLAG(UVM_PROT_ALL,
|
|
UVM_PROT_ALL, UVM_INH_NONE, UVM_ADV_RANDOM, 0))
|
|
== KERN_SUCCESS) {
|
|
UVMHIST_LOG(maphist,"<- done (kva=0x%x)", kva,0,0,0);
|
|
return(kva);
|
|
}
|
|
|
|
/*
|
|
* failed. sleep for a while (on map)
|
|
*/
|
|
|
|
UVMHIST_LOG(maphist,"<<<sleeping>>>",0,0,0,0);
|
|
tsleep((caddr_t)map, PVM, "vallocwait", 0);
|
|
}
|
|
/*NOTREACHED*/
|
|
}
|
|
|
|
/* Sanity; must specify both or none. */
|
|
#if (defined(PMAP_MAP_POOLPAGE) || defined(PMAP_UNMAP_POOLPAGE)) && \
|
|
(!defined(PMAP_MAP_POOLPAGE) || !defined(PMAP_UNMAP_POOLPAGE))
|
|
#error Must specify MAP and UNMAP together.
|
|
#endif
|
|
|
|
/*
|
|
* uvm_km_alloc_poolpage: allocate a page for the pool allocator
|
|
*
|
|
* => if the pmap specifies an alternate mapping method, we use it.
|
|
*/
|
|
|
|
/* ARGSUSED */
|
|
vaddr_t
|
|
uvm_km_alloc_poolpage1(map, obj, waitok)
|
|
vm_map_t map;
|
|
struct uvm_object *obj;
|
|
boolean_t waitok;
|
|
{
|
|
#if defined(PMAP_MAP_POOLPAGE)
|
|
struct vm_page *pg;
|
|
vaddr_t va;
|
|
|
|
again:
|
|
pg = uvm_pagealloc(NULL, 0, NULL, UVM_PGA_USERESERVE);
|
|
if (pg == NULL) {
|
|
if (waitok) {
|
|
uvm_wait("plpg");
|
|
goto again;
|
|
} else
|
|
return (0);
|
|
}
|
|
va = PMAP_MAP_POOLPAGE(VM_PAGE_TO_PHYS(pg));
|
|
if (va == 0)
|
|
uvm_pagefree(pg);
|
|
return (va);
|
|
#else
|
|
vaddr_t va;
|
|
int s;
|
|
|
|
/*
|
|
* NOTE: We may be called with a map that doens't require splimp
|
|
* protection (e.g. kernel_map). However, it does not hurt to
|
|
* go to splimp in this case (since unprocted maps will never be
|
|
* accessed in interrupt context).
|
|
*
|
|
* XXX We may want to consider changing the interface to this
|
|
* XXX function.
|
|
*/
|
|
|
|
s = splimp();
|
|
va = uvm_km_kmemalloc(map, obj, PAGE_SIZE, waitok ? 0 : UVM_KMF_NOWAIT);
|
|
splx(s);
|
|
return (va);
|
|
#endif /* PMAP_MAP_POOLPAGE */
|
|
}
|
|
|
|
/*
|
|
* uvm_km_free_poolpage: free a previously allocated pool page
|
|
*
|
|
* => if the pmap specifies an alternate unmapping method, we use it.
|
|
*/
|
|
|
|
/* ARGSUSED */
|
|
void
|
|
uvm_km_free_poolpage1(map, addr)
|
|
vm_map_t map;
|
|
vaddr_t addr;
|
|
{
|
|
#if defined(PMAP_UNMAP_POOLPAGE)
|
|
paddr_t pa;
|
|
|
|
pa = PMAP_UNMAP_POOLPAGE(addr);
|
|
uvm_pagefree(PHYS_TO_VM_PAGE(pa));
|
|
#else
|
|
int s;
|
|
|
|
/*
|
|
* NOTE: We may be called with a map that doens't require splimp
|
|
* protection (e.g. kernel_map). However, it does not hurt to
|
|
* go to splimp in this case (since unprocted maps will never be
|
|
* accessed in interrupt context).
|
|
*
|
|
* XXX We may want to consider changing the interface to this
|
|
* XXX function.
|
|
*/
|
|
|
|
s = splimp();
|
|
uvm_km_free(map, addr, PAGE_SIZE);
|
|
splx(s);
|
|
#endif /* PMAP_UNMAP_POOLPAGE */
|
|
}
|