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1 /*-
2  * Copyright (C) 2002 Benno Rice <benno@FreeBSD.org>
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, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY Benno Rice ``AS IS'' AND ANY EXPRESS OR
15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17  * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
18  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
20  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
21  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
22  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
23  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24  */
25
26 #include <sys/cdefs.h>
27 __FBSDID("$FreeBSD$");
28
29 #include <sys/param.h>
30 #include <sys/systm.h>
31 #include <sys/bio.h>
32 #include <sys/kernel.h>
33 #include <sys/kthread.h>
34 #include <sys/linker.h>
35 #include <sys/lock.h>
36 #include <sys/malloc.h>
37 #include <sys/mutex.h>
38 #include <sys/proc.h>
39
40 #include <geom/geom.h>
41
42 #include <dev/ofw/openfirm.h>
43
44 #define OFWD_BLOCKSIZE  512
45
46 struct ofwd_softc
47 {
48         struct bio_queue_head ofwd_bio_queue;
49         struct mtx      ofwd_queue_mtx;
50         ihandle_t       ofwd_instance;
51         off_t           ofwd_mediasize;
52         unsigned        ofwd_sectorsize;
53         unsigned        ofwd_fwheads;
54         unsigned        ofwd_fwsectors;
55         struct proc     *ofwd_procp;
56         struct g_geom   *ofwd_gp;
57         struct g_provider *ofwd_pp;
58 } ofwd_softc;
59
60 static g_init_t g_ofwd_init;
61 static g_start_t g_ofwd_start;
62 static g_access_t g_ofwd_access;
63
64 struct g_class g_ofwd_class = {
65         .name = "OFWD",
66         .version = G_VERSION,
67         .init = g_ofwd_init,
68         .start = g_ofwd_start,
69         .access = g_ofwd_access,
70 };
71
72 DECLARE_GEOM_CLASS(g_ofwd_class, g_ofwd);
73
74 static int ofwd_enable = 0;
75 TUNABLE_INT("kern.ofw.disk", &ofwd_enable);
76
77 static int
78 ofwd_startio(struct ofwd_softc *sc, struct bio *bp)
79 {
80         u_int r;
81
82         r = OF_seek(sc->ofwd_instance, bp->bio_offset);
83
84         switch (bp->bio_cmd) {
85         case BIO_READ:
86                 r = OF_read(sc->ofwd_instance, (void *)bp->bio_data,
87                    bp->bio_length);
88                 break;
89         case BIO_WRITE:
90                 r = OF_write(sc->ofwd_instance, (void *)bp->bio_data,
91                    bp->bio_length);
92                 break;
93         }
94         if (r != bp->bio_length)
95                 panic("ofwd: incorrect i/o count");
96
97         bp->bio_resid = 0;
98         return (0);
99 }
100
101 static void
102 ofwd_kthread(void *arg)
103 {
104         struct ofwd_softc *sc;
105         struct bio *bp;
106         int error;
107
108         sc = arg;
109         curthread->td_base_pri = PRIBIO;
110
111         for (;;) {
112                 mtx_lock(&sc->ofwd_queue_mtx);
113                 bp = bioq_takefirst(&sc->ofwd_bio_queue);
114                 if (!bp) {
115                         msleep(sc, &sc->ofwd_queue_mtx, PRIBIO | PDROP,
116                             "ofwdwait", 0);
117                         continue;
118                 }
119                 mtx_unlock(&sc->ofwd_queue_mtx);
120                 if (bp->bio_cmd == BIO_GETATTR) {
121                         error = EOPNOTSUPP;
122                 } else
123                         error = ofwd_startio(sc, bp);
124
125                 if (error != -1) {
126                         bp->bio_completed = bp->bio_length;
127                         g_io_deliver(bp, error);
128                 }
129         }
130 }
131
132 static void
133 g_ofwd_init(struct g_class *mp __unused)
134 {
135         char path[128];
136         char fname[32];
137         phandle_t ofd;
138         struct ofwd_softc *sc;
139         struct g_geom *gp;
140         struct g_provider *pp;
141         ihandle_t ifd;
142         int error;
143
144         if (ofwd_enable == 0)
145                 return;
146
147         ofd = OF_finddevice("ofwdisk");
148         if (ofd == -1)
149                 return;
150
151         bzero(path, 128);
152         OF_package_to_path(ofd, path, 128);
153         OF_getprop(ofd, "file", fname, sizeof(fname));
154         printf("ofw_disk located at %s, file %s\n", path, fname);
155         ifd = OF_open(path);
156         if (ifd == -1) {
157                 printf("ofw_disk: could not create instance\n");
158                 return;
159         }
160
161         sc = (struct ofwd_softc *)malloc(sizeof *sc, M_DEVBUF,
162             M_WAITOK | M_ZERO);
163         bioq_init(&sc->ofwd_bio_queue);
164         mtx_init(&sc->ofwd_queue_mtx, "ofwd bio queue", NULL, MTX_DEF);
165         sc->ofwd_instance = ifd;
166         sc->ofwd_mediasize = (off_t)2 * 33554432;
167         sc->ofwd_sectorsize = OFWD_BLOCKSIZE;
168         sc->ofwd_fwsectors = 0;
169         sc->ofwd_fwheads = 0;
170         error = kproc_create(ofwd_kthread, sc, &sc->ofwd_procp, 0, 0,
171             "ofwd0");
172         if (error != 0) {
173                 free(sc, M_DEVBUF);
174                 return;
175         }
176
177         gp = g_new_geomf(&g_ofwd_class, "ofwd0");
178         gp->softc = sc;
179         pp = g_new_providerf(gp, "ofwd0");
180         pp->mediasize = sc->ofwd_mediasize;
181         pp->sectorsize = sc->ofwd_sectorsize;
182         sc->ofwd_gp = gp;
183         sc->ofwd_pp = pp;
184         g_error_provider(pp, 0);
185 }
186
187 static void
188 g_ofwd_start(struct bio *bp)
189 {
190         struct ofwd_softc *sc;
191
192         sc = bp->bio_to->geom->softc;
193         mtx_lock(&sc->ofwd_queue_mtx);
194         bioq_disksort(&sc->ofwd_bio_queue, bp);
195         mtx_unlock(&sc->ofwd_queue_mtx);
196         wakeup(sc);
197 }
198
199 static int
200 g_ofwd_access(struct g_provider *pp, int r, int w, int e)
201 {
202
203         if (pp->geom->softc == NULL)
204                 return (ENXIO);
205         return (0);
206 }