scsipi_ioctl.c revision 1.8
1 /* $NetBSD: scsipi_ioctl.c,v 1.8 1994/10/20 20:31:27 mycroft 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/malloc.h> 43 #include <sys/buf.h> 44 #include <sys/proc.h> 45 #include <sys/device.h> 46 47 #include <scsi/scsi_all.h> 48 #include <scsi/scsiconf.h> 49 #include <sys/scsiio.h> 50 51 void scsierr __P((struct buf *, int)); 52 53 /* 54 * We need to maintain an assocation between the buf and the SCSI request 55 * structure. We do this with a simple array of scsi_ioctl structures below. 56 * XXX The free structures should probably be in a linked list. 57 */ 58 #define NIOCTL 16 59 60 struct scsi_ioctl { 61 struct buf *si_bp; 62 scsireq_t *si_screq; 63 struct scsi_link *si_sc_link; 64 struct uio si_uio; 65 struct iovec si_iov; 66 } scsi_ioctl[NIOCTL]; 67 68 struct scsi_ioctl * 69 si_get(bp) 70 struct buf *bp; 71 { 72 int s = splbio(); 73 struct scsi_ioctl *si; 74 int error; 75 76 for (;;) { 77 for (si = scsi_ioctl; si < &scsi_ioctl[NIOCTL]; si++) 78 if (si->si_bp == 0) { 79 si->si_bp = bp; 80 splx(s); 81 return si; 82 } 83 error = tsleep(scsi_ioctl, PRIBIO | PCATCH, "siget", 0); 84 if (error) { 85 splx(s); 86 return 0; 87 } 88 } 89 } 90 91 void 92 si_free(si) 93 struct scsi_ioctl *si; 94 { 95 int s = splbio(); 96 97 si->si_bp = 0; 98 wakeup(scsi_ioctl); 99 splx(s); 100 } 101 102 struct scsi_ioctl * 103 si_find(bp) 104 struct buf *bp; 105 { 106 int s = splbio(); 107 struct scsi_ioctl *si; 108 109 for (si = scsi_ioctl; si < &scsi_ioctl[NIOCTL]; si++) 110 if (si->si_bp == bp) { 111 splx(s); 112 return si; 113 } 114 splx(s); 115 return 0; 116 } 117 118 /* 119 * We let the user interpret his own sense in the generic scsi world. 120 * This routine is called at interrupt time if the SCSI_USER bit was set 121 * in the flags passed to scsi_scsi_cmd(). No other completion processing 122 * takes place, even if we are running over another device driver. 123 * The lower level routines that call us here, will free the xs and restart 124 * the device's queue if such exists. 125 */ 126 void 127 scsi_user_done(xs) 128 struct scsi_xfer *xs; 129 { 130 struct buf *bp; 131 scsireq_t *screq; 132 struct scsi_ioctl *si; 133 134 bp = xs->bp; 135 if (!bp) { /* ALL user requests must have a buf */ 136 sc_print_addr(xs->sc_link); 137 printf("User command with no buf\n"); 138 return; 139 } 140 si = si_find(bp); 141 if (!si) { 142 sc_print_addr(xs->sc_link); 143 printf("User command with no ioctl\n"); 144 return; 145 } 146 screq = si->si_screq; 147 si_free(si); 148 if (!screq) { /* Is it one of ours? (the SCSI_USER bit says it is) */ 149 sc_print_addr(xs->sc_link); 150 printf("User command with no request\n"); 151 return; 152 } 153 154 SC_DEBUG(xs->sc_link, SDEV_DB2, ("user-done\n")); 155 screq->retsts = 0; 156 screq->status = xs->status; 157 switch(xs->error) { 158 case XS_NOERROR: 159 SC_DEBUG(xs->sc_link, SDEV_DB3, ("no error\n")); 160 screq->datalen_used = xs->datalen - xs->resid; /* probably rubbish */ 161 screq->retsts = SCCMD_OK; 162 break; 163 case XS_SENSE: 164 SC_DEBUG(xs->sc_link, SDEV_DB3, ("have sense\n")); 165 screq->senselen_used = min(sizeof(xs->sense), SENSEBUFLEN); 166 bcopy(&xs->sense, screq->sense, screq->senselen); 167 screq->retsts = SCCMD_SENSE; 168 break; 169 case XS_DRIVER_STUFFUP: 170 sc_print_addr(xs->sc_link); 171 printf("host adapter code inconsistency\n"); 172 screq->retsts = SCCMD_UNKNOWN; 173 break; 174 case XS_TIMEOUT: 175 SC_DEBUG(xs->sc_link, SDEV_DB3, ("timeout\n")); 176 screq->retsts = SCCMD_TIMEOUT; 177 break; 178 case XS_BUSY: 179 SC_DEBUG(xs->sc_link, SDEV_DB3, ("busy\n")); 180 screq->retsts = SCCMD_BUSY; 181 break; 182 default: 183 sc_print_addr(xs->sc_link); 184 printf("unknown error category from host adapter code\n"); 185 screq->retsts = SCCMD_UNKNOWN; 186 break; 187 } 188 biodone(bp); /* we're waiting on it in scsi_strategy() */ 189 return; /* it'll free the xs and restart any queue */ 190 } 191 192 193 /* Pseudo strategy function 194 * Called by scsi_do_ioctl() via physio/physstrat if there is to 195 * be data transfered, and directly if there is no data transfer. 196 * 197 * Should I reorganize this so it returns to physio instead 198 * of sleeping in scsiio_scsi_cmd? Is there any advantage, other 199 * than avoiding the probable duplicate wakeup in iodone? [PD] 200 * 201 * No, seems ok to me... [JRE] 202 * (I don't see any duplicate wakeups) 203 * 204 * Can't be used with block devices or raw_read/raw_write directly 205 * from the cdevsw/bdevsw tables because they couldn't have added 206 * the screq structure. [JRE] 207 */ 208 void 209 scsistrategy(bp) 210 struct buf *bp; 211 { 212 int err; 213 struct scsi_ioctl *si; 214 scsireq_t *screq; 215 struct scsi_link *sc_link; 216 int flags = 0; 217 int s; 218 219 si = si_find(bp); 220 if (!si) { 221 printf("user_strat: No ioctl\n"); 222 scsierr(bp, EINVAL); 223 return; 224 } 225 screq = si->si_screq; 226 sc_link = si->si_sc_link; 227 si_free(si); 228 if (!sc_link) { 229 printf("user_strat: No link pointer\n"); 230 scsierr(bp, EINVAL); 231 return; 232 } 233 SC_DEBUG(sc_link, SDEV_DB2, ("user_strategy\n")); 234 if (!screq) { 235 sc_print_addr(sc_link); 236 printf("No request block\n"); 237 scsierr(bp, EINVAL); 238 return; 239 } 240 241 /* 242 * We're in trouble if physio tried to break up the transfer. 243 */ 244 if (bp->b_bcount != screq->datalen) { 245 sc_print_addr(sc_link); 246 printf("physio split the request.. cannot proceed\n"); 247 scsierr(bp, EIO); 248 return; 249 } 250 251 if (screq->timeout == 0) { 252 scsierr(bp, EINVAL); 253 return; 254 } 255 256 if (screq->cmdlen > sizeof(struct scsi_generic)) { 257 sc_print_addr(sc_link); 258 printf("cmdlen too big\n"); 259 scsierr(bp, EFAULT); 260 return; 261 } 262 263 if (screq->flags & SCCMD_READ) 264 flags |= SCSI_DATA_IN; 265 if (screq->flags & SCCMD_WRITE) 266 flags |= SCSI_DATA_OUT; 267 if (screq->flags & SCCMD_TARGET) 268 flags |= SCSI_TARGET; 269 if (screq->flags & SCCMD_ESCAPE) 270 flags |= SCSI_ESCAPE; 271 272 err = scsi_scsi_cmd(sc_link, (struct scsi_generic *)screq->cmd, 273 screq->cmdlen, (u_char *)bp->b_data, screq->datalen, 274 0, /* user must do the retries *//* ignored */ 275 screq->timeout, bp, flags | SCSI_USER); 276 277 /* because there is a bp, scsi_scsi_cmd will return immediatly */ 278 if (err) { 279 scsierr(bp, err); 280 return; 281 } 282 SC_DEBUG(sc_link, SDEV_DB3, ("about to sleep\n")); 283 s = splbio(); 284 while (!(bp->b_flags & B_DONE)) 285 tsleep(bp, PRIBIO, "scistr", 0); 286 splx(s); 287 SC_DEBUG(sc_link, SDEV_DB3, ("back from sleep\n")); 288 return; 289 } 290 291 /* 292 * Something (e.g. another driver) has called us 293 * with an sc_link for a target/lun/adapter, and a scsi 294 * specific ioctl to perform, better try. 295 * If user-level type command, we must still be running 296 * in the context of the calling process 297 */ 298 int 299 scsi_do_ioctl(sc_link, dev, cmd, addr, f) 300 struct scsi_link *sc_link; 301 dev_t dev; 302 int cmd; 303 caddr_t addr; 304 int f; 305 { 306 int error; 307 308 SC_DEBUG(sc_link, SDEV_DB2, ("scsi_do_ioctl(0x%x)\n", cmd)); 309 switch(cmd) { 310 case SCIOCCOMMAND: { 311 /* 312 * You won't believe this, but the arg copied in 313 * from the user space, is on the kernel stack 314 * for this process, so we can't write 315 * to it at interrupt time.. 316 * we need to copy it in and out! 317 * Make a static copy using malloc! 318 */ 319 scsireq_t *screq = (scsireq_t *)addr; 320 struct buf *bp; 321 struct scsi_ioctl *si; 322 caddr_t daddr; 323 int len; 324 325 bp = malloc(sizeof(struct buf), M_TEMP, M_WAITOK); 326 bzero(bp, sizeof(struct buf)); 327 daddr = screq->databuf; 328 bp->b_bcount = len = screq->datalen; 329 si = si_get(bp); 330 if (!si) { 331 scsierr(bp, EINTR); 332 return EINTR; 333 } 334 si->si_screq = screq; 335 si->si_sc_link = sc_link; 336 if (len) { 337 si->si_iov.iov_base = daddr; 338 si->si_iov.iov_len = len; 339 si->si_uio.uio_iov = &si->si_iov; 340 si->si_uio.uio_iovcnt = 1; 341 si->si_uio.uio_offset = 0; 342 si->si_uio.uio_segflg = UIO_USERSPACE; 343 si->si_uio.uio_rw = 344 (screq->flags & SCCMD_READ) ? UIO_READ : UIO_WRITE; 345 si->si_uio.uio_procp = curproc; /* XXX */ 346 error = physio(scsistrategy, bp, dev, 347 (screq->flags & SCCMD_READ) ? B_READ : B_WRITE, 348 sc_link->adapter->scsi_minphys, &si->si_uio); 349 } else { 350 /* if no data, no need to translate it.. */ 351 bp->b_data = 0; 352 bp->b_dev = -1; /* irrelevant info */ 353 bp->b_flags = 0; 354 scsistrategy(bp); 355 error = bp->b_error; 356 } 357 free(bp, M_TEMP); 358 return error; 359 } 360 case SCIOCDEBUG: { 361 int level = *((int *)addr); 362 363 SC_DEBUG(sc_link, SDEV_DB3, ("debug set to %d\n", level)); 364 sc_link->flags &= ~SDEV_DBX; /* clear debug bits */ 365 if (level & 1) 366 sc_link->flags |= SDEV_DB1; 367 if (level & 2) 368 sc_link->flags |= SDEV_DB2; 369 if (level & 4) 370 sc_link->flags |= SDEV_DB3; 371 if (level & 8) 372 sc_link->flags |= SDEV_DB4; 373 return 0; 374 } 375 case SCIOCREPROBE: { 376 struct scsi_addr *sca = (struct scsi_addr *)addr; 377 378 return scsi_probe_busses(sca->scbus, sca->target, sca->lun); 379 } 380 case SCIOCRECONFIG: 381 case SCIOCDECONFIG: 382 return EINVAL; 383 case SCIOCIDENTIFY: { 384 struct scsi_addr *sca = (struct scsi_addr *)addr; 385 386 sca->scbus = sc_link->scsibus; 387 sca->target = sc_link->target; 388 sca->lun = sc_link->lun; 389 return 0; 390 } 391 default: 392 return ENOTTY; 393 } 394 395 #ifdef DIAGNOSTIC 396 panic("scsi_do_ioctl: impossible"); 397 #endif 398 } 399 400 void 401 scsierr(bp, error) 402 struct buf *bp; 403 int error; 404 { 405 406 bp->b_flags |= B_ERROR; 407 bp->b_error = error; 408 biodone(bp); 409 return; 410 } 411
Indexes created Mon Sep 22 10:09:38 GMT 2025