ld_thunkbus.c revision 1.16
1 /* $NetBSD: ld_thunkbus.c,v 1.16 2011/09/16 16:30:51 reinoud Exp $ */ 2 3 /*- 4 * Copyright (c) 2011 Jared D. McNeill <jmcneill (at) invisible.ca> 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 THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: ld_thunkbus.c,v 1.16 2011/09/16 16:30:51 reinoud Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/proc.h> 34 #include <sys/systm.h> 35 #include <sys/device.h> 36 #include <sys/buf.h> 37 #include <sys/disk.h> 38 #include <sys/kmem.h> 39 40 #include <dev/ldvar.h> 41 42 #include <machine/mainbus.h> 43 #include <machine/thunk.h> 44 #include <machine/intr.h> 45 46 static int ld_thunkbus_match(device_t, cfdata_t, void *); 47 static void ld_thunkbus_attach(device_t, device_t, void *); 48 49 static int ld_thunkbus_ldstart(struct ld_softc *, struct buf *); 50 static int ld_thunkbus_lddump(struct ld_softc *, void *, int, int); 51 static int ld_thunkbus_ldflush(struct ld_softc *, int); 52 53 static void ld_thunkbus_sig(int, siginfo_t *, void *); 54 static void ld_thunkbus_complete(void *); 55 56 struct ld_thunkbus_softc; 57 58 struct ld_thunkbus_transfer { 59 struct ld_thunkbus_softc *tt_sc; 60 struct aiocb tt_aio; 61 struct buf *tt_bp; 62 }; 63 64 struct ld_thunkbus_softc { 65 struct ld_softc sc_ld; 66 67 int sc_fd; 68 void *sc_ih; 69 70 struct ld_thunkbus_transfer sc_tt; 71 bool busy; 72 }; 73 74 CFATTACH_DECL_NEW(ld_thunkbus, sizeof(struct ld_thunkbus_softc), 75 ld_thunkbus_match, ld_thunkbus_attach, NULL, NULL); 76 77 static int 78 ld_thunkbus_match(device_t parent, cfdata_t match, void *opaque) 79 { 80 struct thunkbus_attach_args *taa = opaque; 81 82 if (taa->taa_type != THUNKBUS_TYPE_DISKIMAGE) 83 return 0; 84 85 return 1; 86 } 87 88 static void 89 ld_thunkbus_attach(device_t parent, device_t self, void *opaque) 90 { 91 struct ld_thunkbus_softc *sc = device_private(self); 92 struct ld_softc *ld = &sc->sc_ld; 93 struct thunkbus_attach_args *taa = opaque; 94 const char *path = taa->u.diskimage.path; 95 struct sigaction sa; 96 ssize_t size, blksize; 97 98 ld->sc_dv = self; 99 100 sc->sc_fd = thunk_open(path, O_RDWR, 0); 101 if (sc->sc_fd == -1) { 102 aprint_error(": couldn't open %s: %d\n", path, thunk_geterrno()); 103 return; 104 } 105 if (thunk_fstat_getsize(sc->sc_fd, &size, &blksize) == -1) { 106 aprint_error(": couldn't stat %s: %d\n", path, thunk_geterrno()); 107 return; 108 } 109 110 aprint_naive("\n"); 111 aprint_normal(": %s (%lld)\n", path, (long long)size); 112 113 ld->sc_flags = LDF_ENABLED; 114 ld->sc_maxxfer = blksize; 115 ld->sc_secsize = 512; 116 ld->sc_secperunit = size / ld->sc_secsize; 117 ld->sc_maxqueuecnt = 1; 118 ld->sc_start = ld_thunkbus_ldstart; 119 ld->sc_dump = ld_thunkbus_lddump; 120 ld->sc_flush = ld_thunkbus_ldflush; 121 122 sc->sc_ih = softint_establish(SOFTINT_BIO, 123 ld_thunkbus_complete, sc); 124 125 sa.sa_flags = SA_RESTART | SA_SIGINFO; 126 sa.sa_sigaction = ld_thunkbus_sig; 127 thunk_sigemptyset(&sa.sa_mask); 128 // thunk_sigaddset(&sa.sa_mask, SIGALRM); 129 if (thunk_sigaction(SIGIO, &sa, NULL) == -1) 130 panic("couldn't register SIGIO handler: %d", thunk_geterrno()); 131 132 sc->busy = false; 133 134 ldattach(ld); 135 } 136 137 static void 138 ld_thunkbus_sig(int sig, siginfo_t *info, void *ctx) 139 { 140 struct ld_thunkbus_transfer *tt = NULL; 141 struct ld_thunkbus_softc *sc; 142 143 curcpu()->ci_idepth++; 144 145 if (info->si_signo == SIGIO) { 146 if (info->si_code == SI_ASYNCIO) 147 tt = info->si_value.sival_ptr; 148 if (tt) { 149 sc = tt->tt_sc; 150 spl_intr(IPL_BIO, softint_schedule, sc->sc_ih); 151 // spl_intr(IPL_BIO, ld_thunkbus_complete, sc); 152 // softint_schedule(sc->sc_ih); 153 } 154 } 155 156 curcpu()->ci_idepth--; 157 } 158 159 static void 160 ld_thunkbus_complete(void *arg) 161 { 162 struct ld_thunkbus_softc *sc = arg; 163 struct ld_thunkbus_transfer *tt = &sc->sc_tt; 164 struct buf *bp = tt->tt_bp; 165 166 if (!sc->busy) 167 panic("%s: but not busy?\n", __func__); 168 169 if (thunk_aio_error(&tt->tt_aio) == 0 && 170 thunk_aio_return(&tt->tt_aio) != -1) { 171 bp->b_resid = 0; 172 } else { 173 bp->b_error = thunk_geterrno(); 174 bp->b_resid = bp->b_bcount; 175 } 176 177 dprintf_debug("\tfin\n"); 178 if (bp->b_error) 179 dprintf_debug("error!\n"); 180 181 sc->busy = false; 182 lddone(&sc->sc_ld, bp); 183 } 184 185 static int 186 ld_thunkbus_ldstart(struct ld_softc *ld, struct buf *bp) 187 { 188 struct ld_thunkbus_softc *sc = (struct ld_thunkbus_softc *)ld; 189 struct ld_thunkbus_transfer *tt = &sc->sc_tt; 190 int error; 191 192 tt->tt_sc = sc; 193 tt->tt_bp = bp; 194 memset(&tt->tt_aio, 0, sizeof(tt->tt_aio)); 195 tt->tt_aio.aio_fildes = sc->sc_fd; 196 tt->tt_aio.aio_buf = bp->b_data; 197 tt->tt_aio.aio_nbytes = bp->b_bcount; 198 tt->tt_aio.aio_offset = bp->b_rawblkno * ld->sc_secsize; 199 200 tt->tt_aio.aio_sigevent.sigev_notify = SIGEV_SIGNAL; 201 tt->tt_aio.aio_sigevent.sigev_signo = SIGIO; 202 tt->tt_aio.aio_sigevent.sigev_value.sival_ptr = tt; 203 204 #if 0 205 device_printf(sc->sc_ld.sc_dv, "%s addr %p, off=%lld, count=%lld\n", 206 (bp->b_flags & B_READ) ? "rd" : "wr", 207 bp->b_data, 208 (long long)bp->b_rawblkno, 209 (long long)bp->b_bcount); 210 #endif 211 if (sc->busy) 212 panic("%s: reentry", __func__); 213 sc->busy = true; 214 215 if (bp->b_flags & B_READ) 216 error = thunk_aio_read(&tt->tt_aio); 217 else 218 error = thunk_aio_write(&tt->tt_aio); 219 220 return error == -1 ? thunk_geterrno() : 0; 221 } 222 223 static int 224 ld_thunkbus_lddump(struct ld_softc *ld, void *data, int blkno, int blkcnt) 225 { 226 struct ld_thunkbus_softc *sc = (struct ld_thunkbus_softc *)ld; 227 ssize_t len; 228 229 len = thunk_pwrite(sc->sc_fd, data, blkcnt, blkno); 230 if (len == -1) 231 return thunk_geterrno(); 232 else if (len != blkcnt) { 233 device_printf(ld->sc_dv, "%s failed (short xfer)\n", __func__); 234 return EIO; 235 } 236 237 return 0; 238 } 239 240 static int 241 ld_thunkbus_ldflush(struct ld_softc *ld, int flags) 242 { 243 struct ld_thunkbus_softc *sc = (struct ld_thunkbus_softc *)ld; 244 245 if (thunk_fsync(sc->sc_fd) == -1) 246 return thunk_geterrno(); 247 248 return 0; 249 } 250 251
Indexes created Fri Sep 26 20:09:58 GMT 2025