scsipi_ioctl.c revision 1.21
1 /* $NetBSD: scsipi_ioctl.c,v 1.21 1996/09/13 00:35:59 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 1994 Charles Hannum. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Charles Hannum. 17 * 4. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Contributed by HD Associates (hd (at) world.std.com). 34 * Copyright (c) 1992, 1993 HD Associates 35 * 36 * Berkeley style copyright. 37 */ 38 39 #include <sys/types.h> 40 #include <sys/errno.h> 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/malloc.h> 44 #include <sys/buf.h> 45 #include <sys/proc.h> 46 #include <sys/device.h> 47 #include <sys/fcntl.h> 48 49 #include <scsi/scsi_all.h> 50 #include <scsi/scsiconf.h> 51 #include <sys/scsiio.h> 52 53 struct scsi_ioctl { 54 LIST_ENTRY(scsi_ioctl) si_list; 55 struct buf si_bp; 56 struct uio si_uio; 57 struct iovec si_iov; 58 scsireq_t si_screq; 59 struct scsi_link *si_sc_link; 60 }; 61 62 LIST_HEAD(, scsi_ioctl) si_head; 63 64 struct scsi_ioctl *si_get __P((void)); 65 void si_free __P((struct scsi_ioctl *)); 66 struct scsi_ioctl *si_find __P((struct buf *)); 67 void scsistrategy __P((struct buf *)); 68 69 struct scsi_ioctl * 70 si_get() 71 { 72 struct scsi_ioctl *si; 73 int s; 74 75 si = malloc(sizeof(struct scsi_ioctl), M_TEMP, M_WAITOK); 76 bzero(si, sizeof(struct scsi_ioctl)); 77 s = splbio(); 78 LIST_INSERT_HEAD(&si_head, si, si_list); 79 splx(s); 80 return (si); 81 } 82 83 void 84 si_free(si) 85 struct scsi_ioctl *si; 86 { 87 int s; 88 89 s = splbio(); 90 LIST_REMOVE(si, si_list); 91 splx(s); 92 free(si, M_TEMP); 93 } 94 95 struct scsi_ioctl * 96 si_find(bp) 97 struct buf *bp; 98 { 99 struct scsi_ioctl *si; 100 int s; 101 102 s = splbio(); 103 for (si = si_head.lh_first; si != 0; si = si->si_list.le_next) 104 if (bp == &si->si_bp) 105 break; 106 splx(s); 107 return (si); 108 } 109 110 /* 111 * We let the user interpret his own sense in the generic scsi world. 112 * This routine is called at interrupt time if the SCSI_USER bit was set 113 * in the flags passed to scsi_scsi_cmd(). No other completion processing 114 * takes place, even if we are running over another device driver. 115 * The lower level routines that call us here, will free the xs and restart 116 * the device's queue if such exists. 117 */ 118 void 119 scsi_user_done(xs) 120 struct scsi_xfer *xs; 121 { 122 struct buf *bp; 123 struct scsi_ioctl *si; 124 scsireq_t *screq; 125 struct scsi_link *sc_link; 126 127 bp = xs->bp; 128 if (!bp) { /* ALL user requests must have a buf */ 129 sc_print_addr(xs->sc_link); 130 printf("User command with no buf\n"); 131 return; 132 } 133 si = si_find(bp); 134 if (!si) { 135 sc_print_addr(xs->sc_link); 136 printf("User command with no ioctl\n"); 137 return; 138 } 139 screq = &si->si_screq; 140 sc_link = si->si_sc_link; 141 SC_DEBUG(xs->sc_link, SDEV_DB2, ("user-done\n")); 142 143 screq->retsts = 0; 144 screq->status = xs->status; 145 switch (xs->error) { 146 case XS_NOERROR: 147 SC_DEBUG(sc_link, SDEV_DB3, ("no error\n")); 148 screq->datalen_used = xs->datalen - xs->resid; /* probably rubbish */ 149 screq->retsts = SCCMD_OK; 150 break; 151 case XS_SENSE: 152 SC_DEBUG(sc_link, SDEV_DB3, ("have sense\n")); 153 screq->senselen_used = min(sizeof(xs->sense), SENSEBUFLEN); 154 bcopy(&xs->sense, screq->sense, screq->senselen); 155 screq->retsts = SCCMD_SENSE; 156 break; 157 case XS_DRIVER_STUFFUP: 158 sc_print_addr(sc_link); 159 printf("host adapter code inconsistency\n"); 160 screq->retsts = SCCMD_UNKNOWN; 161 break; 162 case XS_TIMEOUT: 163 SC_DEBUG(sc_link, SDEV_DB3, ("timeout\n")); 164 screq->retsts = SCCMD_TIMEOUT; 165 break; 166 case XS_BUSY: 167 SC_DEBUG(sc_link, SDEV_DB3, ("busy\n")); 168 screq->retsts = SCCMD_BUSY; 169 break; 170 default: 171 sc_print_addr(sc_link); 172 printf("unknown error category from host adapter code\n"); 173 screq->retsts = SCCMD_UNKNOWN; 174 break; 175 } 176 biodone(bp); /* we're waiting on it in scsi_strategy() */ 177 } 178 179 180 /* Pseudo strategy function 181 * Called by scsi_do_ioctl() via physio/physstrat if there is to 182 * be data transfered, and directly if there is no data transfer. 183 * 184 * Should I reorganize this so it returns to physio instead 185 * of sleeping in scsiio_scsi_cmd? Is there any advantage, other 186 * than avoiding the probable duplicate wakeup in iodone? [PD] 187 * 188 * No, seems ok to me... [JRE] 189 * (I don't see any duplicate wakeups) 190 * 191 * Can't be used with block devices or raw_read/raw_write directly 192 * from the cdevsw/bdevsw tables because they couldn't have added 193 * the screq structure. [JRE] 194 */ 195 void 196 scsistrategy(bp) 197 struct buf *bp; 198 { 199 struct scsi_ioctl *si; 200 scsireq_t *screq; 201 struct scsi_link *sc_link; 202 int error; 203 int flags = 0; 204 int s; 205 206 si = si_find(bp); 207 if (!si) { 208 printf("user_strat: No ioctl\n"); 209 error = EINVAL; 210 goto bad; 211 } 212 screq = &si->si_screq; 213 sc_link = si->si_sc_link; 214 SC_DEBUG(sc_link, SDEV_DB2, ("user_strategy\n")); 215 216 /* 217 * We're in trouble if physio tried to break up the transfer. 218 */ 219 if (bp->b_bcount != screq->datalen) { 220 sc_print_addr(sc_link); 221 printf("physio split the request.. cannot proceed\n"); 222 error = EIO; 223 goto bad; 224 } 225 226 if (screq->timeout == 0) { 227 error = EINVAL; 228 goto bad; 229 } 230 231 if (screq->cmdlen > sizeof(struct scsi_generic)) { 232 sc_print_addr(sc_link); 233 printf("cmdlen too big\n"); 234 error = EFAULT; 235 goto bad; 236 } 237 238 if (screq->flags & SCCMD_READ) 239 flags |= SCSI_DATA_IN; 240 if (screq->flags & SCCMD_WRITE) 241 flags |= SCSI_DATA_OUT; 242 if (screq->flags & SCCMD_TARGET) 243 flags |= SCSI_TARGET; 244 if (screq->flags & SCCMD_ESCAPE) 245 flags |= SCSI_ESCAPE; 246 247 error = scsi_scsi_cmd(sc_link, (struct scsi_generic *)screq->cmd, 248 screq->cmdlen, (u_char *)bp->b_data, screq->datalen, 249 0, /* user must do the retries *//* ignored */ 250 screq->timeout, bp, flags | SCSI_USER | SCSI_NOSLEEP); 251 252 /* because there is a bp, scsi_scsi_cmd will return immediatly */ 253 if (error) 254 goto bad; 255 256 SC_DEBUG(sc_link, SDEV_DB3, ("about to sleep\n")); 257 s = splbio(); 258 while ((bp->b_flags & B_DONE) == 0) 259 tsleep(bp, PRIBIO, "scistr", 0); 260 splx(s); 261 SC_DEBUG(sc_link, SDEV_DB3, ("back from sleep\n")); 262 263 return; 264 265 bad: 266 bp->b_flags |= B_ERROR; 267 bp->b_error = error; 268 biodone(bp); 269 } 270 271 /* 272 * Something (e.g. another driver) has called us 273 * with an sc_link for a target/lun/adapter, and a scsi 274 * specific ioctl to perform, better try. 275 * If user-level type command, we must still be running 276 * in the context of the calling process 277 */ 278 int 279 scsi_do_ioctl(sc_link, dev, cmd, addr, flag, p) 280 struct scsi_link *sc_link; 281 dev_t dev; 282 u_long cmd; 283 caddr_t addr; 284 int flag; 285 struct proc *p; 286 { 287 int error; 288 289 SC_DEBUG(sc_link, SDEV_DB2, ("scsi_do_ioctl(0x%lx)\n", cmd)); 290 291 /* Check for the safe-ness of this request. */ 292 switch (cmd) { 293 case SCIOCIDENTIFY: 294 break; 295 296 default: 297 if ((flag & FWRITE) == 0) 298 return EBADF; 299 } 300 301 switch(cmd) { 302 case SCIOCCOMMAND: { 303 scsireq_t *screq = (scsireq_t *)addr; 304 struct scsi_ioctl *si; 305 int len; 306 307 si = si_get(); 308 si->si_screq = *screq; 309 si->si_sc_link = sc_link; 310 len = screq->datalen; 311 if (len) { 312 si->si_iov.iov_base = screq->databuf; 313 si->si_iov.iov_len = len; 314 si->si_uio.uio_iov = &si->si_iov; 315 si->si_uio.uio_iovcnt = 1; 316 si->si_uio.uio_resid = len; 317 si->si_uio.uio_offset = 0; 318 si->si_uio.uio_segflg = UIO_USERSPACE; 319 si->si_uio.uio_rw = 320 (screq->flags & SCCMD_READ) ? UIO_READ : UIO_WRITE; 321 si->si_uio.uio_procp = p; 322 error = physio(scsistrategy, &si->si_bp, dev, 323 (screq->flags & SCCMD_READ) ? B_READ : B_WRITE, 324 sc_link->adapter->scsi_minphys, &si->si_uio); 325 } else { 326 /* if no data, no need to translate it.. */ 327 si->si_bp.b_flags = 0; 328 si->si_bp.b_data = 0; 329 si->si_bp.b_bcount = 0; 330 si->si_bp.b_dev = dev; 331 si->si_bp.b_proc = p; 332 scsistrategy(&si->si_bp); 333 error = si->si_bp.b_error; 334 } 335 *screq = si->si_screq; 336 si_free(si); 337 return error; 338 } 339 case SCIOCDEBUG: { 340 int level = *((int *)addr); 341 342 SC_DEBUG(sc_link, SDEV_DB3, ("debug set to %d\n", level)); 343 sc_link->flags &= ~SDEV_DBX; /* clear debug bits */ 344 if (level & 1) 345 sc_link->flags |= SDEV_DB1; 346 if (level & 2) 347 sc_link->flags |= SDEV_DB2; 348 if (level & 4) 349 sc_link->flags |= SDEV_DB3; 350 if (level & 8) 351 sc_link->flags |= SDEV_DB4; 352 return 0; 353 } 354 case SCIOCREPROBE: { 355 struct scsi_addr *sca = (struct scsi_addr *)addr; 356 357 return scsi_probe_busses(sca->scbus, sca->target, sca->lun); 358 } 359 case SCIOCRECONFIG: 360 case SCIOCDECONFIG: 361 return EINVAL; 362 case SCIOCIDENTIFY: { 363 struct scsi_addr *sca = (struct scsi_addr *)addr; 364 365 sca->scbus = sc_link->scsibus; 366 sca->target = sc_link->target; 367 sca->lun = sc_link->lun; 368 return 0; 369 } 370 default: 371 return ENOTTY; 372 } 373 374 #ifdef DIAGNOSTIC 375 panic("scsi_do_ioctl: impossible"); 376 #endif 377 } 378
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