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 */ 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 switch (bp->bio_cmd) { 86 case BIO_READ: 87 r = OF_read(sc->ofwd_instance, (void *)bp->bio_data, 88 bp->bio_length); 89 break; 90 case BIO_WRITE: 91 r = OF_write(sc->ofwd_instance, (void *)bp->bio_data, 92 bp->bio_length); 93 break; 94 } 95 if (r != bp->bio_length) 96 panic("ofwd: incorrect i/o count"); 97 98 bp->bio_resid = 0; 99 return (0); 100 } 101 102 static void 103 ofwd_kthread(void *arg) 104 { 105 struct ofwd_softc *sc; 106 struct bio *bp; 107 int error; 108 109 sc = arg; 110 curthread->td_base_pri = PRIBIO; 111 112 for (;;) { 113 mtx_lock(&sc->ofwd_queue_mtx); 114 bp = bioq_takefirst(&sc->ofwd_bio_queue); 115 if (!bp) { 116 msleep(sc, &sc->ofwd_queue_mtx, PRIBIO | PDROP, 117 "ofwdwait", 0); 118 continue; 119 } 120 mtx_unlock(&sc->ofwd_queue_mtx); 121 if (bp->bio_cmd == BIO_GETATTR) { 122 error = EOPNOTSUPP; 123 } else 124 error = ofwd_startio(sc, bp); 125 126 if (error != -1) { 127 bp->bio_completed = bp->bio_length; 128 g_io_deliver(bp, error); 129 } 130 } 131 } 132 133 static void 134 g_ofwd_init(struct g_class *mp __unused) 135 { 136 struct ofwd_softc *sc; 137 struct g_geom *gp; 138 struct g_provider *pp; 139 char path[128]; 140 char fname[32]; 141 phandle_t ofd; 142 ihandle_t ifd; 143 int error; 144 145 if (ofwd_enable == 0) 146 return; 147 148 ofd = OF_finddevice("ofwdisk"); 149 if (ofd == -1) 150 return; 151 152 bzero(path, 128); 153 OF_package_to_path(ofd, path, 128); 154 OF_getprop(ofd, "file", fname, sizeof(fname)); 155 printf("ofw_disk located at %s, file %s\n", path, fname); 156 ifd = OF_open(path); 157 if (ifd == -1) { 158 printf("ofw_disk: could not create instance\n"); 159 return; 160 } 161 162 sc = (struct ofwd_softc *)malloc(sizeof *sc, M_DEVBUF, 163 M_WAITOK|M_ZERO); 164 bioq_init(&sc->ofwd_bio_queue); 165 mtx_init(&sc->ofwd_queue_mtx, "ofwd bio queue", NULL, MTX_DEF); 166 sc->ofwd_instance = ifd; 167 sc->ofwd_mediasize = (off_t)2*33554432 * OFWD_BLOCKSIZE; 168 sc->ofwd_sectorsize = OFWD_BLOCKSIZE; 169 sc->ofwd_fwsectors = 0; 170 sc->ofwd_fwheads = 0; 171 error = kthread_create(ofwd_kthread, sc, &sc->ofwd_procp, 0, 0, 172 "ofwd0"); 173 if (error != 0) { 174 free(sc, M_DEVBUF); 175 return; 176 } 177 178 gp = g_new_geomf(&g_ofwd_class, "ofwd0"); 179 gp->softc = sc; 180 pp = g_new_providerf(gp, "ofwd0"); 181 pp->mediasize = sc->ofwd_mediasize; 182 pp->sectorsize = sc->ofwd_sectorsize; 183 sc->ofwd_gp = gp; 184 sc->ofwd_pp = pp; 185 g_error_provider(pp, 0); 186 } 187 188 static void 189 g_ofwd_start(struct bio *bp) 190 { 191 struct ofwd_softc *sc; 192 193 sc = bp->bio_to->geom->softc; 194 mtx_lock(&sc->ofwd_queue_mtx); 195 bioq_disksort(&sc->ofwd_bio_queue, bp); 196 mtx_unlock(&sc->ofwd_queue_mtx); 197 wakeup(sc); 198 } 199 200 static int 201 g_ofwd_access(struct g_provider *pp, int r, int w, int e) 202 { 203 204 if (pp->geom->softc == NULL) 205 return (ENXIO); 206 return (0); 207 } 208