Remove crossrefs to non-existant usb(3) man page.
[dragonfly.git] / sys / kern / kern_physio.c
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1/*
2 * Copyright (c) 1994 John S. Dyson
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice immediately at the beginning of the file, without modification,
10 * this list of conditions, and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. Absolutely no warranty of function or purpose is made by the author
15 * John S. Dyson.
16 * 4. Modifications may be freely made to this file if the above conditions
17 * are met.
18 *
f366cb61 19 * $FreeBSD: src/sys/kern/kern_physio.c,v 1.46.2.4 2003/11/14 09:51:47 simokawa Exp $
5ff4cfb5 20 * $DragonFly: src/sys/kern/kern_physio.c,v 1.11 2005/08/03 16:36:33 hmp Exp $
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21 */
22
23#include <sys/param.h>
24#include <sys/systm.h>
25#include <sys/buf.h>
26#include <sys/conf.h>
27#include <sys/proc.h>
28#include <sys/uio.h>
335dda38 29#include <sys/device.h>
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30
31#include <vm/vm.h>
32#include <vm/vm_extern.h>
33
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34#include <machine/physio_proc.h>
35
36/* I have no idea what this is used for */
37struct physio_proc_head physio_proc_freet, physio_proc_busyt;
38
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39static void
40physwakeup(struct buf *bp)
41{
42 wakeup((caddr_t) bp);
43}
44
45int
46physio(dev_t dev, struct uio *uio, int ioflag)
47{
48 int i;
49 int error;
f366cb61 50 int chk_blockno;
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51 caddr_t sa;
52 off_t blockno;
53 u_int iolen;
54 struct buf *bp;
55
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56 /*
57 * NOTE: we no longer have to PHOLD() the process, because the
58 * kernel stack / uarea cannot be swapped, and when it can be in
59 * the future it will only happen if the process is sleeping on
60 * a particular address.
61 */
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62 bp = getpbuf(NULL);
63 sa = bp->b_data;
64 error = 0;
65
66 /* XXX: sanity check */
67 if(dev->si_iosize_max < PAGE_SIZE) {
68 printf("WARNING: %s si_iosize_max=%d, using DFLTPHYS.\n",
69 devtoname(dev), dev->si_iosize_max);
70 dev->si_iosize_max = DFLTPHYS;
71 }
72
f366cb61 73 /* Don't check block number overflow for D_MEM */
978d73e7 74 if ((dev_dflags(dev) & D_TYPEMASK) == D_MEM)
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75 chk_blockno = 0;
76 else
77 chk_blockno = 1;
78
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79 for (i = 0; i < uio->uio_iovcnt; i++) {
80 while (uio->uio_iov[i].iov_len) {
81 if (uio->uio_rw == UIO_READ)
5ff4cfb5 82 bp->b_flags = B_PHYS | B_READ;
984263bc 83 else
5ff4cfb5 84 bp->b_flags = B_PHYS | B_WRITE;
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85 bp->b_dev = dev;
86 bp->b_iodone = physwakeup;
87 bp->b_data = uio->uio_iov[i].iov_base;
88 bp->b_bcount = uio->uio_iov[i].iov_len;
89 bp->b_offset = uio->uio_offset;
90 bp->b_saveaddr = sa;
91
92 /* Don't exceed drivers iosize limit */
93 if (bp->b_bcount > dev->si_iosize_max)
94 bp->b_bcount = dev->si_iosize_max;
95
96 /*
97 * Make sure the pbuf can map the request
98 * XXX: The pbuf has kvasize = MAXPHYS so a request
99 * XXX: larger than MAXPHYS - PAGE_SIZE must be
100 * XXX: page aligned or it will be fragmented.
101 */
102 iolen = ((vm_offset_t) bp->b_data) & PAGE_MASK;
103 if ((bp->b_bcount + iolen) > bp->b_kvasize) {
104 bp->b_bcount = bp->b_kvasize;
105 if (iolen != 0)
106 bp->b_bcount -= PAGE_SIZE;
107 }
108 bp->b_bufsize = bp->b_bcount;
109
110 blockno = bp->b_offset >> DEV_BSHIFT;
f366cb61 111 if (chk_blockno && (daddr_t)blockno != blockno) {
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112 error = EINVAL; /* blockno overflow */
113 goto doerror;
114 }
115 bp->b_blkno = blockno;
116
117 if (uio->uio_segflg == UIO_USERSPACE)
118 if (vmapbuf(bp) < 0) {
119 error = EFAULT;
120 goto doerror;
121 }
122
123 BUF_STRATEGY(bp, 0);
e43a034f 124 crit_enter();
984263bc 125 while ((bp->b_flags & B_DONE) == 0)
377d4740 126 tsleep((caddr_t)bp, 0, "physstr", 0);
e43a034f 127 crit_exit();
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128
129 if (uio->uio_segflg == UIO_USERSPACE)
130 vunmapbuf(bp);
131 iolen = bp->b_bcount - bp->b_resid;
132 if (iolen == 0 && !(bp->b_flags & B_ERROR))
133 goto doerror; /* EOF */
134 uio->uio_iov[i].iov_len -= iolen;
135 uio->uio_iov[i].iov_base += iolen;
136 uio->uio_resid -= iolen;
137 uio->uio_offset += iolen;
138 if( bp->b_flags & B_ERROR) {
139 error = bp->b_error;
140 goto doerror;
141 }
142 }
143 }
144doerror:
d094eee8 145 bp->b_data = sa;
984263bc 146 relpbuf(bp, NULL);
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147 return (error);
148}