8170d6e52b
It turns out the callers of vm_page_replace know exactly which page they are replacing and would like to assert about it. Change those from hard panics to KASSERTs, and provide them with a wrapper so they don't have to deal with warnings from an INVARIANTS-dependent dead store of the return value of vm_page_replace. Submitted by: Ryan Libby <rlibby@gmail.com> Reviewed by: alc, kib (earlier version) Sponsored by: EMC / Isilon Storage Division Differential Revision: https://reviews.freebsd.org/D4497
427 lines
11 KiB
C
427 lines
11 KiB
C
/*-
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* Copyright (c) 1990 University of Utah.
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. 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 Systems Programming Group of the University of Utah Computer
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* Science Department.
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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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* 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
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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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* @(#)device_pager.c 8.1 (Berkeley) 6/11/93
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/lock.h>
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#include <sys/proc.h>
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#include <sys/mutex.h>
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#include <sys/mman.h>
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#include <sys/rwlock.h>
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#include <sys/sx.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/vm_object.h>
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#include <vm/vm_page.h>
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#include <vm/vm_pager.h>
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#include <vm/vm_phys.h>
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#include <vm/uma.h>
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static void dev_pager_init(void);
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static vm_object_t dev_pager_alloc(void *, vm_ooffset_t, vm_prot_t,
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vm_ooffset_t, struct ucred *);
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static void dev_pager_dealloc(vm_object_t);
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static int dev_pager_getpages(vm_object_t, vm_page_t *, int, int *, int *);
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static void dev_pager_putpages(vm_object_t, vm_page_t *, int, int, int *);
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static boolean_t dev_pager_haspage(vm_object_t, vm_pindex_t, int *, int *);
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static void dev_pager_free_page(vm_object_t object, vm_page_t m);
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/* list of device pager objects */
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static struct pagerlst dev_pager_object_list;
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/* protect list manipulation */
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static struct mtx dev_pager_mtx;
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struct pagerops devicepagerops = {
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.pgo_init = dev_pager_init,
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.pgo_alloc = dev_pager_alloc,
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.pgo_dealloc = dev_pager_dealloc,
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.pgo_getpages = dev_pager_getpages,
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.pgo_putpages = dev_pager_putpages,
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.pgo_haspage = dev_pager_haspage,
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};
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struct pagerops mgtdevicepagerops = {
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.pgo_alloc = dev_pager_alloc,
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.pgo_dealloc = dev_pager_dealloc,
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.pgo_getpages = dev_pager_getpages,
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.pgo_putpages = dev_pager_putpages,
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.pgo_haspage = dev_pager_haspage,
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};
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static int old_dev_pager_ctor(void *handle, vm_ooffset_t size, vm_prot_t prot,
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vm_ooffset_t foff, struct ucred *cred, u_short *color);
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static void old_dev_pager_dtor(void *handle);
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static int old_dev_pager_fault(vm_object_t object, vm_ooffset_t offset,
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int prot, vm_page_t *mres);
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static struct cdev_pager_ops old_dev_pager_ops = {
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.cdev_pg_ctor = old_dev_pager_ctor,
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.cdev_pg_dtor = old_dev_pager_dtor,
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.cdev_pg_fault = old_dev_pager_fault
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};
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static void
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dev_pager_init(void)
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{
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TAILQ_INIT(&dev_pager_object_list);
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mtx_init(&dev_pager_mtx, "dev_pager list", NULL, MTX_DEF);
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}
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vm_object_t
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cdev_pager_lookup(void *handle)
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{
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vm_object_t object;
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mtx_lock(&dev_pager_mtx);
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object = vm_pager_object_lookup(&dev_pager_object_list, handle);
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mtx_unlock(&dev_pager_mtx);
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return (object);
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}
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vm_object_t
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cdev_pager_allocate(void *handle, enum obj_type tp, struct cdev_pager_ops *ops,
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vm_ooffset_t size, vm_prot_t prot, vm_ooffset_t foff, struct ucred *cred)
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{
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vm_object_t object, object1;
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vm_pindex_t pindex;
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u_short color;
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if (tp != OBJT_DEVICE && tp != OBJT_MGTDEVICE)
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return (NULL);
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/*
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* Offset should be page aligned.
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*/
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if (foff & PAGE_MASK)
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return (NULL);
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size = round_page(size);
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pindex = OFF_TO_IDX(foff + size);
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if (ops->cdev_pg_ctor(handle, size, prot, foff, cred, &color) != 0)
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return (NULL);
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mtx_lock(&dev_pager_mtx);
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/*
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* Look up pager, creating as necessary.
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*/
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object1 = NULL;
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object = vm_pager_object_lookup(&dev_pager_object_list, handle);
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if (object == NULL) {
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/*
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* Allocate object and associate it with the pager. Initialize
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* the object's pg_color based upon the physical address of the
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* device's memory.
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*/
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mtx_unlock(&dev_pager_mtx);
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object1 = vm_object_allocate(tp, pindex);
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object1->flags |= OBJ_COLORED;
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object1->pg_color = color;
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object1->handle = handle;
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object1->un_pager.devp.ops = ops;
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object1->un_pager.devp.dev = handle;
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TAILQ_INIT(&object1->un_pager.devp.devp_pglist);
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mtx_lock(&dev_pager_mtx);
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object = vm_pager_object_lookup(&dev_pager_object_list, handle);
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if (object != NULL) {
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/*
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* We raced with other thread while allocating object.
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*/
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if (pindex > object->size)
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object->size = pindex;
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KASSERT(object->type == tp,
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("Inconsistent device pager type %p %d", object, tp));
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} else {
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object = object1;
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object1 = NULL;
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object->handle = handle;
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TAILQ_INSERT_TAIL(&dev_pager_object_list, object,
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pager_object_list);
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}
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} else {
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if (pindex > object->size)
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object->size = pindex;
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KASSERT(object->type == tp,
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("Inconsistent device pager type %p %d", object, tp));
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}
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mtx_unlock(&dev_pager_mtx);
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if (object1 != NULL) {
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object1->handle = object1;
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mtx_lock(&dev_pager_mtx);
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TAILQ_INSERT_TAIL(&dev_pager_object_list, object1,
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pager_object_list);
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mtx_unlock(&dev_pager_mtx);
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vm_object_deallocate(object1);
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}
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return (object);
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}
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static vm_object_t
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dev_pager_alloc(void *handle, vm_ooffset_t size, vm_prot_t prot,
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vm_ooffset_t foff, struct ucred *cred)
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{
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return (cdev_pager_allocate(handle, OBJT_DEVICE, &old_dev_pager_ops,
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size, prot, foff, cred));
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}
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void
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cdev_pager_free_page(vm_object_t object, vm_page_t m)
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{
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VM_OBJECT_ASSERT_WLOCKED(object);
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if (object->type == OBJT_MGTDEVICE) {
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KASSERT((m->oflags & VPO_UNMANAGED) == 0, ("unmanaged %p", m));
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pmap_remove_all(m);
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vm_page_lock(m);
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vm_page_remove(m);
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vm_page_unlock(m);
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} else if (object->type == OBJT_DEVICE)
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dev_pager_free_page(object, m);
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}
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static void
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dev_pager_free_page(vm_object_t object, vm_page_t m)
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{
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VM_OBJECT_ASSERT_WLOCKED(object);
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KASSERT((object->type == OBJT_DEVICE &&
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(m->oflags & VPO_UNMANAGED) != 0),
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("Managed device or page obj %p m %p", object, m));
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TAILQ_REMOVE(&object->un_pager.devp.devp_pglist, m, plinks.q);
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vm_page_putfake(m);
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}
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static void
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dev_pager_dealloc(vm_object_t object)
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{
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vm_page_t m;
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VM_OBJECT_WUNLOCK(object);
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object->un_pager.devp.ops->cdev_pg_dtor(object->un_pager.devp.dev);
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mtx_lock(&dev_pager_mtx);
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TAILQ_REMOVE(&dev_pager_object_list, object, pager_object_list);
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mtx_unlock(&dev_pager_mtx);
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VM_OBJECT_WLOCK(object);
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if (object->type == OBJT_DEVICE) {
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/*
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* Free up our fake pages.
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*/
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while ((m = TAILQ_FIRST(&object->un_pager.devp.devp_pglist))
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!= NULL)
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dev_pager_free_page(object, m);
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}
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object->handle = NULL;
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object->type = OBJT_DEAD;
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}
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static int
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dev_pager_getpages(vm_object_t object, vm_page_t *ma, int count, int *rbehind,
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int *rahead)
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{
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int error;
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/* Since our haspage reports zero after/before, the count is 1. */
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KASSERT(count == 1, ("%s: count %d", __func__, count));
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VM_OBJECT_ASSERT_WLOCKED(object);
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error = object->un_pager.devp.ops->cdev_pg_fault(object,
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IDX_TO_OFF(ma[0]->pindex), PROT_READ, &ma[0]);
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VM_OBJECT_ASSERT_WLOCKED(object);
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if (error == VM_PAGER_OK) {
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KASSERT((object->type == OBJT_DEVICE &&
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(ma[0]->oflags & VPO_UNMANAGED) != 0) ||
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(object->type == OBJT_MGTDEVICE &&
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(ma[0]->oflags & VPO_UNMANAGED) == 0),
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("Wrong page type %p %p", ma[0], object));
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if (object->type == OBJT_DEVICE) {
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TAILQ_INSERT_TAIL(&object->un_pager.devp.devp_pglist,
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ma[0], plinks.q);
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}
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if (rbehind)
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*rbehind = 0;
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if (rahead)
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*rahead = 0;
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}
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return (error);
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}
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static int
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old_dev_pager_fault(vm_object_t object, vm_ooffset_t offset, int prot,
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vm_page_t *mres)
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{
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vm_paddr_t paddr;
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vm_page_t m_paddr, page;
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struct cdev *dev;
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struct cdevsw *csw;
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struct file *fpop;
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struct thread *td;
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vm_memattr_t memattr;
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int ref, ret;
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memattr = object->memattr;
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VM_OBJECT_WUNLOCK(object);
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dev = object->handle;
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csw = dev_refthread(dev, &ref);
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if (csw == NULL) {
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VM_OBJECT_WLOCK(object);
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return (VM_PAGER_FAIL);
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}
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td = curthread;
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fpop = td->td_fpop;
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td->td_fpop = NULL;
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ret = csw->d_mmap(dev, offset, &paddr, prot, &memattr);
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td->td_fpop = fpop;
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dev_relthread(dev, ref);
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if (ret != 0) {
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printf(
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"WARNING: dev_pager_getpage: map function returns error %d", ret);
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VM_OBJECT_WLOCK(object);
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return (VM_PAGER_FAIL);
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}
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/* If "paddr" is a real page, perform a sanity check on "memattr". */
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if ((m_paddr = vm_phys_paddr_to_vm_page(paddr)) != NULL &&
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pmap_page_get_memattr(m_paddr) != memattr) {
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memattr = pmap_page_get_memattr(m_paddr);
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printf(
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"WARNING: A device driver has set \"memattr\" inconsistently.\n");
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}
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if (((*mres)->flags & PG_FICTITIOUS) != 0) {
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/*
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* If the passed in result page is a fake page, update it with
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* the new physical address.
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*/
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page = *mres;
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VM_OBJECT_WLOCK(object);
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vm_page_updatefake(page, paddr, memattr);
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} else {
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/*
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* Replace the passed in reqpage page with our own fake page and
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* free up the all of the original pages.
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*/
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page = vm_page_getfake(paddr, memattr);
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VM_OBJECT_WLOCK(object);
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vm_page_replace_checked(page, object, (*mres)->pindex, *mres);
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vm_page_lock(*mres);
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vm_page_free(*mres);
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vm_page_unlock(*mres);
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*mres = page;
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}
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page->valid = VM_PAGE_BITS_ALL;
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return (VM_PAGER_OK);
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}
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static void
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dev_pager_putpages(vm_object_t object, vm_page_t *m, int count, int flags,
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int *rtvals)
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{
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panic("dev_pager_putpage called");
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}
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static boolean_t
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dev_pager_haspage(vm_object_t object, vm_pindex_t pindex, int *before,
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int *after)
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{
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if (before != NULL)
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*before = 0;
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if (after != NULL)
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*after = 0;
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return (TRUE);
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}
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static int
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old_dev_pager_ctor(void *handle, vm_ooffset_t size, vm_prot_t prot,
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vm_ooffset_t foff, struct ucred *cred, u_short *color)
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{
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struct cdev *dev;
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struct cdevsw *csw;
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vm_memattr_t dummy;
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vm_ooffset_t off;
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vm_paddr_t paddr;
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unsigned int npages;
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int ref;
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/*
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* Make sure this device can be mapped.
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*/
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dev = handle;
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csw = dev_refthread(dev, &ref);
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if (csw == NULL)
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return (ENXIO);
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/*
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* Check that the specified range of the device allows the desired
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* protection.
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*
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* XXX assumes VM_PROT_* == PROT_*
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*/
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npages = OFF_TO_IDX(size);
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paddr = 0; /* Make paddr initialized for the case of size == 0. */
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for (off = foff; npages--; off += PAGE_SIZE) {
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if (csw->d_mmap(dev, off, &paddr, (int)prot, &dummy) != 0) {
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dev_relthread(dev, ref);
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return (EINVAL);
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}
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}
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dev_ref(dev);
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dev_relthread(dev, ref);
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*color = atop(paddr) - OFF_TO_IDX(off - PAGE_SIZE);
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return (0);
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}
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static void
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old_dev_pager_dtor(void *handle)
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{
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dev_rel(handle);
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}
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