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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 1999-2001 by Sun Microsystems, Inc.
* All rights reserved.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/types.h>
#include <sys/debug.h>
#include <sys/cmn_err.h>
#include <sys/kmem.h>
#include <sys/sysmacros.h>
#include <sys/buf.h>
#include <sys/user.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/vmsystm.h>
#include <sys/mman.h>
#include <sys/vm.h>
#include <sys/ddi.h>
#include <vm/as.h>
#include <vm/page.h>
/*
* Prepare for raw I/O request - derived from default_physio()
* This is the 'setup' portion of physio, limited to dealing
* with unstructured access to a single range of user space addresses.
*
* This is quite limited in functionality compared to physio().
*
* 1. allocate and return buf header
* 2. lock down user pages and verify access protections
*
* Use B_READ (S_WRITE) for unstructured access. (We don't know the
* direction of the transfer, so use the safest.)
*/
int
fc_physio_setup(struct buf **bpp, void *io_base, size_t io_len)
{
struct proc *procp;
struct as *asp;
int error = 0;
page_t **pplist;
struct buf *bp = *bpp;
bp = getrbuf(KM_SLEEP);
bp->b_iodone = NULL;
bp->b_resid = 0;
*bpp = bp;
/* segflg *is always* UIO_USERSPACE for us */
procp = ttoproc(curthread);
asp = procp->p_as;
ASSERT(SEMA_HELD(&bp->b_sem));
bp->b_error = 0;
bp->b_proc = procp;
bp->b_flags = B_BUSY | B_PHYS | B_READ;
bp->b_edev = 0;
bp->b_lblkno = 0;
/*
* Don't count on b_addr remaining untouched by the
* code below (it may be reset because someone does
* a bp_mapin on the buffer).
*/
bp->b_un.b_addr = io_base;
bp->b_bcount = io_len;
error = as_pagelock(asp, &pplist, io_base, io_len, S_WRITE);
if (error != 0) {
bp->b_flags |= B_ERROR;
bp->b_error = error;
bp->b_flags &= ~(B_BUSY|B_WANTED|B_PHYS);
freerbuf(bp);
*bpp = NULL;
return (error);
}
bp->b_shadow = pplist;
if (pplist != NULL) {
bp->b_flags |= B_SHADOW;
}
return (0);
}
/*
* unlock the pages and free the buf header, if we allocated it.
*/
void
fc_physio_free(struct buf **bpp, void *io_base, size_t io_len)
{
struct buf *bp = *bpp;
page_t **pplist = NULL;
/*
* unlock the pages
*/
if (bp->b_flags & B_SHADOW)
pplist = bp->b_shadow;
as_pageunlock(bp->b_proc->p_as, pplist, io_base, io_len, S_WRITE);
bp->b_flags &= ~(B_BUSY|B_WANTED|B_PHYS|B_SHADOW);
freerbuf(bp);
*bpp = NULL;
}
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