1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (C) 2002 Benno Rice <benno@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY Benno Rice ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include <sys/param.h>
29 #include <sys/systm.h>
30 #include <sys/bio.h>
31 #include <sys/kernel.h>
32 #include <sys/kthread.h>
33 #include <sys/linker.h>
34 #include <sys/lock.h>
35 #include <sys/malloc.h>
36 #include <sys/mutex.h>
37 #include <sys/proc.h>
38
39 #include <geom/geom.h>
40
41 #include <dev/ofw/openfirm.h>
42
43 #define OFWD_BLOCKSIZE 512
44
45 struct ofwd_softc
46 {
47 struct bio_queue_head ofwd_bio_queue;
48 struct mtx ofwd_queue_mtx;
49 ihandle_t ofwd_instance;
50 off_t ofwd_mediasize;
51 unsigned ofwd_sectorsize;
52 unsigned ofwd_fwheads;
53 unsigned ofwd_fwsectors;
54 struct proc *ofwd_procp;
55 struct g_geom *ofwd_gp;
56 struct g_provider *ofwd_pp;
57 } ofwd_softc;
58
59 static g_init_t g_ofwd_init;
60 static g_start_t g_ofwd_start;
61 static g_access_t g_ofwd_access;
62
63 struct g_class g_ofwd_class = {
64 .name = "OFWD",
65 .version = G_VERSION,
66 .init = g_ofwd_init,
67 .start = g_ofwd_start,
68 .access = g_ofwd_access,
69 };
70
71 DECLARE_GEOM_CLASS(g_ofwd_class, g_ofwd);
72
73 static int ofwd_enable = 0;
74 TUNABLE_INT("kern.ofw.disk", &ofwd_enable);
75
76 static int
ofwd_startio(struct ofwd_softc * sc,struct bio * bp)77 ofwd_startio(struct ofwd_softc *sc, struct bio *bp)
78 {
79 u_int r;
80
81 r = OF_seek(sc->ofwd_instance, bp->bio_offset);
82
83 switch (bp->bio_cmd) {
84 case BIO_READ:
85 r = OF_read(sc->ofwd_instance, (void *)bp->bio_data,
86 bp->bio_length);
87 break;
88 case BIO_WRITE:
89 r = OF_write(sc->ofwd_instance, (void *)bp->bio_data,
90 bp->bio_length);
91 break;
92 }
93 if (r != bp->bio_length)
94 panic("ofwd: incorrect i/o count");
95
96 bp->bio_resid = 0;
97 return (0);
98 }
99
100 static void
ofwd_kthread(void * arg)101 ofwd_kthread(void *arg)
102 {
103 struct ofwd_softc *sc;
104 struct bio *bp;
105 int error;
106
107 sc = arg;
108 curthread->td_base_pri = PRIBIO;
109
110 for (;;) {
111 mtx_lock(&sc->ofwd_queue_mtx);
112 bp = bioq_takefirst(&sc->ofwd_bio_queue);
113 if (!bp) {
114 msleep(sc, &sc->ofwd_queue_mtx, PRIBIO | PDROP,
115 "ofwdwait", 0);
116 continue;
117 }
118 mtx_unlock(&sc->ofwd_queue_mtx);
119 if (bp->bio_cmd == BIO_GETATTR) {
120 error = EOPNOTSUPP;
121 } else
122 error = ofwd_startio(sc, bp);
123
124 if (error != -1) {
125 bp->bio_completed = bp->bio_length;
126 g_io_deliver(bp, error);
127 }
128 }
129 }
130
131 static void
g_ofwd_init(struct g_class * mp __unused)132 g_ofwd_init(struct g_class *mp __unused)
133 {
134 char path[128];
135 char fname[32];
136 phandle_t ofd;
137 struct ofwd_softc *sc;
138 struct g_geom *gp;
139 struct g_provider *pp;
140 ihandle_t ifd;
141 int error;
142
143 if (ofwd_enable == 0)
144 return;
145
146 ofd = OF_finddevice("ofwdisk");
147 if (ofd == -1)
148 return;
149
150 bzero(path, 128);
151 OF_package_to_path(ofd, path, 128);
152 OF_getprop(ofd, "file", fname, sizeof(fname));
153 printf("ofw_disk located at %s, file %s\n", path, fname);
154 ifd = OF_open(path);
155 if (ifd == -1) {
156 printf("ofw_disk: could not create instance\n");
157 return;
158 }
159
160 sc = (struct ofwd_softc *)malloc(sizeof *sc, M_DEVBUF,
161 M_WAITOK | M_ZERO);
162 bioq_init(&sc->ofwd_bio_queue);
163 mtx_init(&sc->ofwd_queue_mtx, "ofwd bio queue", NULL, MTX_DEF);
164 sc->ofwd_instance = ifd;
165 sc->ofwd_mediasize = (off_t)2 * 33554432;
166 sc->ofwd_sectorsize = OFWD_BLOCKSIZE;
167 sc->ofwd_fwsectors = 0;
168 sc->ofwd_fwheads = 0;
169 error = kproc_create(ofwd_kthread, sc, &sc->ofwd_procp, 0, 0,
170 "ofwd0");
171 if (error != 0) {
172 free(sc, M_DEVBUF);
173 return;
174 }
175
176 gp = g_new_geomf(&g_ofwd_class, "ofwd0");
177 gp->softc = sc;
178 pp = g_new_providerf(gp, "ofwd0");
179 pp->mediasize = sc->ofwd_mediasize;
180 pp->sectorsize = sc->ofwd_sectorsize;
181 sc->ofwd_gp = gp;
182 sc->ofwd_pp = pp;
183 g_error_provider(pp, 0);
184 }
185
186 static void
g_ofwd_start(struct bio * bp)187 g_ofwd_start(struct bio *bp)
188 {
189 struct ofwd_softc *sc;
190
191 sc = bp->bio_to->geom->softc;
192 mtx_lock(&sc->ofwd_queue_mtx);
193 bioq_disksort(&sc->ofwd_bio_queue, bp);
194 mtx_unlock(&sc->ofwd_queue_mtx);
195 wakeup(sc);
196 }
197
198 static int
g_ofwd_access(struct g_provider * pp,int r,int w,int e)199 g_ofwd_access(struct g_provider *pp, int r, int w, int e)
200 {
201
202 if (pp->geom->softc == NULL)
203 return (ENXIO);
204 return (0);
205 }
206