Noticed while attempting to make boolean_t unsigned: some vm-related function declarations and defintions were using boolean_t where they should have used int, and vice versa. MFC after: 1 week Reviewed by: jhb Differential Revision: https://reviews.freebsd.org/D39753
231 lines
6.4 KiB
C
231 lines
6.4 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
|
|
*
|
|
* Copyright (c) 2009 Hudson River Trading LLC
|
|
* Written by: John H. Baldwin <jhb@FreeBSD.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
/*
|
|
* This pager manages OBJT_SG objects. These objects are backed by
|
|
* a scatter/gather list of physical address ranges.
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/rwlock.h>
|
|
#include <sys/sglist.h>
|
|
#include <sys/user.h>
|
|
#include <sys/vmmeter.h>
|
|
|
|
#include <vm/vm.h>
|
|
#include <vm/vm_param.h>
|
|
#include <vm/vm_object.h>
|
|
#include <vm/vm_page.h>
|
|
#include <vm/vm_pager.h>
|
|
#include <vm/vm_phys.h>
|
|
#include <vm/uma.h>
|
|
|
|
static vm_object_t sg_pager_alloc(void *, vm_ooffset_t, vm_prot_t,
|
|
vm_ooffset_t, struct ucred *);
|
|
static void sg_pager_dealloc(vm_object_t);
|
|
static int sg_pager_getpages(vm_object_t, vm_page_t *, int, int *, int *);
|
|
static void sg_pager_putpages(vm_object_t, vm_page_t *, int,
|
|
int, int *);
|
|
static boolean_t sg_pager_haspage(vm_object_t, vm_pindex_t, int *,
|
|
int *);
|
|
|
|
const struct pagerops sgpagerops = {
|
|
.pgo_kvme_type = KVME_TYPE_SG,
|
|
.pgo_alloc = sg_pager_alloc,
|
|
.pgo_dealloc = sg_pager_dealloc,
|
|
.pgo_getpages = sg_pager_getpages,
|
|
.pgo_putpages = sg_pager_putpages,
|
|
.pgo_haspage = sg_pager_haspage,
|
|
};
|
|
|
|
static vm_object_t
|
|
sg_pager_alloc(void *handle, vm_ooffset_t size, vm_prot_t prot,
|
|
vm_ooffset_t foff, struct ucred *cred)
|
|
{
|
|
struct sglist *sg;
|
|
vm_object_t object;
|
|
vm_pindex_t npages, pindex;
|
|
int i;
|
|
|
|
/*
|
|
* Offset should be page aligned.
|
|
*/
|
|
if (foff & PAGE_MASK)
|
|
return (NULL);
|
|
|
|
/*
|
|
* The scatter/gather list must only include page-aligned
|
|
* ranges.
|
|
*/
|
|
npages = 0;
|
|
sg = handle;
|
|
for (i = 0; i < sg->sg_nseg; i++) {
|
|
if ((sg->sg_segs[i].ss_paddr % PAGE_SIZE) != 0 ||
|
|
(sg->sg_segs[i].ss_len % PAGE_SIZE) != 0)
|
|
return (NULL);
|
|
npages += sg->sg_segs[i].ss_len / PAGE_SIZE;
|
|
}
|
|
|
|
/*
|
|
* The scatter/gather list has a fixed size. Refuse requests
|
|
* to map beyond that.
|
|
*/
|
|
size = round_page(size);
|
|
pindex = OFF_TO_IDX(foff) + OFF_TO_IDX(size);
|
|
if (pindex > npages || pindex < OFF_TO_IDX(foff) ||
|
|
pindex < OFF_TO_IDX(size))
|
|
return (NULL);
|
|
|
|
/*
|
|
* Allocate a new object and associate it with the
|
|
* scatter/gather list. It is ok for our purposes to have
|
|
* multiple VM objects associated with the same scatter/gather
|
|
* list because scatter/gather lists are static. This is also
|
|
* simpler than ensuring a unique object per scatter/gather
|
|
* list.
|
|
*/
|
|
object = vm_object_allocate(OBJT_SG, npages);
|
|
object->handle = sglist_hold(sg);
|
|
TAILQ_INIT(&object->un_pager.sgp.sgp_pglist);
|
|
return (object);
|
|
}
|
|
|
|
static void
|
|
sg_pager_dealloc(vm_object_t object)
|
|
{
|
|
struct sglist *sg;
|
|
vm_page_t m;
|
|
|
|
/*
|
|
* Free up our fake pages.
|
|
*/
|
|
while ((m = TAILQ_FIRST(&object->un_pager.sgp.sgp_pglist)) != 0) {
|
|
if (vm_page_busy_acquire(m, VM_ALLOC_WAITFAIL) == 0)
|
|
continue;
|
|
TAILQ_REMOVE(&object->un_pager.sgp.sgp_pglist, m, plinks.q);
|
|
vm_page_putfake(m);
|
|
}
|
|
|
|
sg = object->handle;
|
|
sglist_free(sg);
|
|
object->handle = NULL;
|
|
object->type = OBJT_DEAD;
|
|
}
|
|
|
|
static int
|
|
sg_pager_getpages(vm_object_t object, vm_page_t *m, int count, int *rbehind,
|
|
int *rahead)
|
|
{
|
|
struct sglist *sg;
|
|
vm_page_t m_paddr, page;
|
|
vm_pindex_t offset;
|
|
vm_paddr_t paddr;
|
|
vm_memattr_t memattr;
|
|
size_t space;
|
|
int i;
|
|
|
|
/* Since our haspage reports zero after/before, the count is 1. */
|
|
KASSERT(count == 1, ("%s: count %d", __func__, count));
|
|
/* Handle is stable while paging is in progress. */
|
|
sg = object->handle;
|
|
memattr = object->memattr;
|
|
offset = m[0]->pindex;
|
|
|
|
/*
|
|
* Lookup the physical address of the requested page. An initial
|
|
* value of '1' instead of '0' is used so we can assert that the
|
|
* page is found since '0' can be a valid page-aligned physical
|
|
* address.
|
|
*/
|
|
space = 0;
|
|
paddr = 1;
|
|
for (i = 0; i < sg->sg_nseg; i++) {
|
|
if (space + sg->sg_segs[i].ss_len <= (offset * PAGE_SIZE)) {
|
|
space += sg->sg_segs[i].ss_len;
|
|
continue;
|
|
}
|
|
paddr = sg->sg_segs[i].ss_paddr + offset * PAGE_SIZE - space;
|
|
break;
|
|
}
|
|
KASSERT(paddr != 1, ("invalid SG page index"));
|
|
|
|
/* If "paddr" is a real page, perform a sanity check on "memattr". */
|
|
if ((m_paddr = vm_phys_paddr_to_vm_page(paddr)) != NULL &&
|
|
pmap_page_get_memattr(m_paddr) != memattr) {
|
|
memattr = pmap_page_get_memattr(m_paddr);
|
|
printf(
|
|
"WARNING: A device driver has set \"memattr\" inconsistently.\n");
|
|
}
|
|
|
|
/* Return a fake page for the requested page. */
|
|
KASSERT(!(m[0]->flags & PG_FICTITIOUS),
|
|
("backing page for SG is fake"));
|
|
|
|
/* Construct a new fake page. */
|
|
page = vm_page_getfake(paddr, memattr);
|
|
VM_OBJECT_WLOCK(object);
|
|
TAILQ_INSERT_TAIL(&object->un_pager.sgp.sgp_pglist, page, plinks.q);
|
|
vm_page_replace(page, object, offset, m[0]);
|
|
VM_OBJECT_WUNLOCK(object);
|
|
m[0] = page;
|
|
vm_page_valid(page);
|
|
|
|
if (rbehind)
|
|
*rbehind = 0;
|
|
if (rahead)
|
|
*rahead = 0;
|
|
|
|
return (VM_PAGER_OK);
|
|
}
|
|
|
|
static void
|
|
sg_pager_putpages(vm_object_t object, vm_page_t *m, int count,
|
|
int flags, int *rtvals)
|
|
{
|
|
|
|
panic("sg_pager_putpage called");
|
|
}
|
|
|
|
static boolean_t
|
|
sg_pager_haspage(vm_object_t object, vm_pindex_t pindex, int *before,
|
|
int *after)
|
|
{
|
|
|
|
if (before != NULL)
|
|
*before = 0;
|
|
if (after != NULL)
|
|
*after = 0;
|
|
return (TRUE);
|
|
}
|