1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 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/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/bio.h> 34 #include <sys/kernel.h> 35 #include <sys/kthread.h> 36 #include <sys/linker.h> 37 #include <sys/lock.h> 38 #include <sys/malloc.h> 39 #include <sys/mutex.h> 40 #include <sys/proc.h> 41 42 #include <geom/geom.h> 43 44 #include <dev/ofw/openfirm.h> 45 46 #define OFWD_BLOCKSIZE 512 47 48 struct ofwd_softc 49 { 50 struct bio_queue_head ofwd_bio_queue; 51 struct mtx ofwd_queue_mtx; 52 ihandle_t ofwd_instance; 53 off_t ofwd_mediasize; 54 unsigned ofwd_sectorsize; 55 unsigned ofwd_fwheads; 56 unsigned ofwd_fwsectors; 57 struct proc *ofwd_procp; 58 struct g_geom *ofwd_gp; 59 struct g_provider *ofwd_pp; 60 } ofwd_softc; 61 62 static g_init_t g_ofwd_init; 63 static g_start_t g_ofwd_start; 64 static g_access_t g_ofwd_access; 65 66 struct g_class g_ofwd_class = { 67 .name = "OFWD", 68 .version = G_VERSION, 69 .init = g_ofwd_init, 70 .start = g_ofwd_start, 71 .access = g_ofwd_access, 72 }; 73 74 DECLARE_GEOM_CLASS(g_ofwd_class, g_ofwd); 75 76 static int ofwd_enable = 0; 77 TUNABLE_INT("kern.ofw.disk", &ofwd_enable); 78 79 static int 80 ofwd_startio(struct ofwd_softc *sc, struct bio *bp) 81 { 82 u_int r; 83 84 r = OF_seek(sc->ofwd_instance, bp->bio_offset); 85 86 switch (bp->bio_cmd) { 87 case BIO_READ: 88 r = OF_read(sc->ofwd_instance, (void *)bp->bio_data, 89 bp->bio_length); 90 break; 91 case BIO_WRITE: 92 r = OF_write(sc->ofwd_instance, (void *)bp->bio_data, 93 bp->bio_length); 94 break; 95 } 96 if (r != bp->bio_length) 97 panic("ofwd: incorrect i/o count"); 98 99 bp->bio_resid = 0; 100 return (0); 101 } 102 103 static void 104 ofwd_kthread(void *arg) 105 { 106 struct ofwd_softc *sc; 107 struct bio *bp; 108 int error; 109 110 sc = arg; 111 curthread->td_base_pri = PRIBIO; 112 113 for (;;) { 114 mtx_lock(&sc->ofwd_queue_mtx); 115 bp = bioq_takefirst(&sc->ofwd_bio_queue); 116 if (!bp) { 117 msleep(sc, &sc->ofwd_queue_mtx, PRIBIO | PDROP, 118 "ofwdwait", 0); 119 continue; 120 } 121 mtx_unlock(&sc->ofwd_queue_mtx); 122 if (bp->bio_cmd == BIO_GETATTR) { 123 error = EOPNOTSUPP; 124 } else 125 error = ofwd_startio(sc, bp); 126 127 if (error != -1) { 128 bp->bio_completed = bp->bio_length; 129 g_io_deliver(bp, error); 130 } 131 } 132 } 133 134 static void 135 g_ofwd_init(struct g_class *mp __unused) 136 { 137 char path[128]; 138 char fname[32]; 139 phandle_t ofd; 140 struct ofwd_softc *sc; 141 struct g_geom *gp; 142 struct g_provider *pp; 143 ihandle_t ifd; 144 int error; 145 146 if (ofwd_enable == 0) 147 return; 148 149 ofd = OF_finddevice("ofwdisk"); 150 if (ofd == -1) 151 return; 152 153 bzero(path, 128); 154 OF_package_to_path(ofd, path, 128); 155 OF_getprop(ofd, "file", fname, sizeof(fname)); 156 printf("ofw_disk located at %s, file %s\n", path, fname); 157 ifd = OF_open(path); 158 if (ifd == -1) { 159 printf("ofw_disk: could not create instance\n"); 160 return; 161 } 162 163 sc = (struct ofwd_softc *)malloc(sizeof *sc, M_DEVBUF, 164 M_WAITOK | M_ZERO); 165 bioq_init(&sc->ofwd_bio_queue); 166 mtx_init(&sc->ofwd_queue_mtx, "ofwd bio queue", NULL, MTX_DEF); 167 sc->ofwd_instance = ifd; 168 sc->ofwd_mediasize = (off_t)2 * 33554432; 169 sc->ofwd_sectorsize = OFWD_BLOCKSIZE; 170 sc->ofwd_fwsectors = 0; 171 sc->ofwd_fwheads = 0; 172 error = kproc_create(ofwd_kthread, sc, &sc->ofwd_procp, 0, 0, 173 "ofwd0"); 174 if (error != 0) { 175 free(sc, M_DEVBUF); 176 return; 177 } 178 179 gp = g_new_geomf(&g_ofwd_class, "ofwd0"); 180 gp->softc = sc; 181 pp = g_new_providerf(gp, "ofwd0"); 182 pp->mediasize = sc->ofwd_mediasize; 183 pp->sectorsize = sc->ofwd_sectorsize; 184 sc->ofwd_gp = gp; 185 sc->ofwd_pp = pp; 186 g_error_provider(pp, 0); 187 } 188 189 static void 190 g_ofwd_start(struct bio *bp) 191 { 192 struct ofwd_softc *sc; 193 194 sc = bp->bio_to->geom->softc; 195 mtx_lock(&sc->ofwd_queue_mtx); 196 bioq_disksort(&sc->ofwd_bio_queue, bp); 197 mtx_unlock(&sc->ofwd_queue_mtx); 198 wakeup(sc); 199 } 200 201 static int 202 g_ofwd_access(struct g_provider *pp, int r, int w, int e) 203 { 204 205 if (pp->geom->softc == NULL) 206 return (ENXIO); 207 return (0); 208 } 209