dc722a14c7
So if si_iosize_max is allready set, dont mess with it.. Also just log the problem with maxphys not being set once. designed by: phk tested by: sos
204 lines
4.3 KiB
C
204 lines
4.3 KiB
C
/*
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* Copyright (c) 1994 John S. Dyson
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* All rights reserved.
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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 immediately at the beginning of the file, without modification,
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* 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. Absolutely no warranty of function or purpose is made by the author
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* John S. Dyson.
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* 4. Modifications may be freely made to this file if the above conditions
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* are met.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/buf.h>
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#include <sys/conf.h>
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#include <sys/proc.h>
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#include <sys/uio.h>
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#include <vm/vm.h>
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#include <vm/vm_extern.h>
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static void physwakeup __P((struct buf *bp));
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int
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physread(dev_t dev, struct uio *uio, int ioflag)
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{
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return(physio(NULL, dev, 1, minphys, uio));
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}
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int
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physwrite(dev_t dev, struct uio *uio, int ioflag)
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{
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return(physio(NULL, dev, 0, minphys, uio));
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}
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int
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physio(bp, dev, rw, minp, uio)
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struct buf *bp;
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dev_t dev;
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int rw;
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u_int (*minp) __P((struct buf *bp));
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struct uio *uio;
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{
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int i;
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int bufflags = rw?B_READ:0;
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int error;
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int spl;
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caddr_t sa;
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off_t blockno;
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int bp_alloc = (bp == 0);
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struct buf *bpa;
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/*
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* Keep the process UPAGES from being swapped. (XXX for performance?)
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*/
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PHOLD(curproc);
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/* create and build a buffer header for a transfer */
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bpa = getpbuf(NULL);
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if (!bp_alloc)
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BUF_LOCK(bp, LK_EXCLUSIVE);
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else
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bp = bpa;
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/*
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* get a copy of the kva from the physical buffer
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*/
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sa = bpa->b_data;
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error = bp->b_error = 0;
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for (i = 0; i < uio->uio_iovcnt; i++) {
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while (uio->uio_iov[i].iov_len) {
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bp->b_dev = dev;
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bp->b_bcount = uio->uio_iov[i].iov_len;
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bp->b_flags = B_PHYS | B_CALL | bufflags;
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bp->b_iodone = physwakeup;
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bp->b_data = uio->uio_iov[i].iov_base;
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bp->b_bcount = minp( bp);
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if( minp != minphys)
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bp->b_bcount = minphys( bp);
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bp->b_bufsize = bp->b_bcount;
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/*
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* pass in the kva from the physical buffer
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* for the temporary kernel mapping.
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*/
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bp->b_saveaddr = sa;
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blockno = uio->uio_offset >> DEV_BSHIFT;
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if ((daddr_t)blockno != blockno) {
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error = EINVAL;
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goto doerror;
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}
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bp->b_blkno = blockno;
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bp->b_offset = uio->uio_offset;
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if (uio->uio_segflg == UIO_USERSPACE) {
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if (rw && !useracc(bp->b_data, bp->b_bufsize, B_WRITE)) {
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error = EFAULT;
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goto doerror;
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}
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if (!rw && !useracc(bp->b_data, bp->b_bufsize, B_READ)) {
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error = EFAULT;
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goto doerror;
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}
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/* bring buffer into kernel space */
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vmapbuf(bp);
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}
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/* perform transfer */
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BUF_STRATEGY(bp, 0);
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spl = splbio();
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while ((bp->b_flags & B_DONE) == 0)
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tsleep((caddr_t)bp, PRIBIO, "physstr", 0);
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splx(spl);
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/* release mapping into kernel space */
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if (uio->uio_segflg == UIO_USERSPACE)
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vunmapbuf(bp);
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/*
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* update the uio data
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*/
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{
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int iolen = bp->b_bcount - bp->b_resid;
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if (iolen == 0 && !(bp->b_flags & B_ERROR))
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goto doerror; /* EOF */
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uio->uio_iov[i].iov_len -= iolen;
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uio->uio_iov[i].iov_base += iolen;
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uio->uio_resid -= iolen;
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uio->uio_offset += iolen;
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}
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/*
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* check for an error
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*/
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if( bp->b_flags & B_ERROR) {
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error = bp->b_error;
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goto doerror;
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}
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}
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}
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doerror:
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relpbuf(bpa, NULL);
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if (!bp_alloc) {
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bp->b_flags &= ~B_PHYS;
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BUF_UNLOCK(bp);
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}
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/*
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* Allow the process UPAGES to be swapped again.
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*/
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PRELE(curproc);
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return (error);
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}
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u_int
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minphys(bp)
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struct buf *bp;
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{
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u_int maxphys;
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maxphys = bp->b_dev->si_iosize_max;
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if(!maxphys) {
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printf("WARNING: %s maxphys = 0 ??", devtoname(bp->b_dev));
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maxphys = DFLTPHYS;
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bp->b_dev->si_iosize_max = DFLTPHYS;
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}
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if (bp->b_kvasize && (bp->b_kvasize < maxphys))
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maxphys = bp->b_kvasize;
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if(((vm_offset_t) bp->b_data) & PAGE_MASK) {
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maxphys -= PAGE_SIZE;
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}
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if( bp->b_bcount > maxphys) {
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bp->b_bcount = maxphys;
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}
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return bp->b_bcount;
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}
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static void
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physwakeup(bp)
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struct buf *bp;
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{
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wakeup((caddr_t) bp);
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bp->b_flags &= ~B_CALL;
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}
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