scsipi_ioctl.c revision 1.6
1 /* 2 * Copyright (c) 1994 Charles Hannum. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 3. All advertising materials mentioning features or use of this software 13 * must display the following acknowledgement: 14 * This product includes software developed by Charles Hannum. 15 * 4. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * $Id: scsipi_ioctl.c,v 1.6 1994/06/16 01:11:44 mycroft Exp $ 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 } scsi_ioctl[NIOCTL]; 65 66 struct scsi_ioctl * 67 si_get(bp) 68 struct buf *bp; 69 { 70 int s = splbio(); 71 struct scsi_ioctl *si; 72 int error; 73 74 for (;;) { 75 for (si = scsi_ioctl; si < &scsi_ioctl[NIOCTL]; si++) 76 if (si->si_bp == 0) { 77 si->si_bp = bp; 78 splx(s); 79 return si; 80 } 81 error = tsleep(scsi_ioctl, PRIBIO | PCATCH, "siget", 0); 82 if (error) { 83 splx(s); 84 return 0; 85 } 86 } 87 } 88 89 void 90 si_free(si) 91 struct scsi_ioctl *si; 92 { 93 int s = splbio(); 94 95 si->si_bp = 0; 96 wakeup(scsi_ioctl); 97 splx(s); 98 } 99 100 struct scsi_ioctl * 101 si_find(bp) 102 struct buf *bp; 103 { 104 int s = splbio(); 105 struct scsi_ioctl *si; 106 107 for (si = scsi_ioctl; si < &scsi_ioctl[NIOCTL]; si++) 108 if (si->si_bp == bp) { 109 splx(s); 110 return si; 111 } 112 splx(s); 113 return 0; 114 } 115 116 /* 117 * We let the user interpret his own sense in the generic scsi world. 118 * This routine is called at interrupt time if the SCSI_USER bit was set 119 * in the flags passed to scsi_scsi_cmd(). No other completion processing 120 * takes place, even if we are running over another device driver. 121 * The lower level routines that call us here, will free the xs and restart 122 * the device's queue if such exists. 123 */ 124 void 125 scsi_user_done(xs) 126 struct scsi_xfer *xs; 127 { 128 struct buf *bp; 129 scsireq_t *screq; 130 struct scsi_ioctl *si; 131 132 bp = xs->bp; 133 if (!bp) { /* ALL user requests must have a buf */ 134 sc_print_addr(xs->sc_link); 135 printf("User command with no buf\n"); 136 return; 137 } 138 si = si_find(bp); 139 if (!si) { 140 sc_print_addr(xs->sc_link); 141 printf("User command with no ioctl\n"); 142 return; 143 } 144 screq = si->si_screq; 145 si_free(si); 146 if (!screq) { /* Is it one of ours? (the SCSI_USER bit says it is) */ 147 sc_print_addr(xs->sc_link); 148 printf("User command with no request\n"); 149 return; 150 } 151 152 SC_DEBUG(xs->sc_link, SDEV_DB2, ("user-done\n")); 153 screq->retsts = 0; 154 screq->status = xs->status; 155 switch(xs->error) { 156 case XS_NOERROR: 157 SC_DEBUG(xs->sc_link, SDEV_DB3, ("no error\n")); 158 screq->datalen_used = xs->datalen - xs->resid; /* probably rubbish */ 159 screq->retsts = SCCMD_OK; 160 break; 161 case XS_SENSE: 162 SC_DEBUG(xs->sc_link, SDEV_DB3, ("have sense\n")); 163 screq->senselen_used = min(sizeof(xs->sense), SENSEBUFLEN); 164 bcopy(&xs->sense, screq->sense, screq->senselen); 165 screq->retsts = SCCMD_SENSE; 166 break; 167 case XS_DRIVER_STUFFUP: 168 sc_print_addr(xs->sc_link); 169 printf("host adapter code inconsistency\n"); 170 screq->retsts = SCCMD_UNKNOWN; 171 break; 172 case XS_TIMEOUT: 173 SC_DEBUG(xs->sc_link, SDEV_DB3, ("timeout\n")); 174 screq->retsts = SCCMD_TIMEOUT; 175 break; 176 case XS_BUSY: 177 SC_DEBUG(xs->sc_link, SDEV_DB3, ("busy\n")); 178 screq->retsts = SCCMD_BUSY; 179 break; 180 default: 181 sc_print_addr(xs->sc_link); 182 printf("unknown error category from host adapter code\n"); 183 screq->retsts = SCCMD_UNKNOWN; 184 break; 185 } 186 biodone(bp); /* we're waiting on it in scsi_strategy() */ 187 return; /* it'll free the xs and restart any queue */ 188 } 189 190 191 /* Pseudo strategy function 192 * Called by scsi_do_ioctl() via physio/physstrat if there is to 193 * be data transfered, and directly if there is no data transfer. 194 * 195 * Should I reorganize this so it returns to physio instead 196 * of sleeping in scsiio_scsi_cmd? Is there any advantage, other 197 * than avoiding the probable duplicate wakeup in iodone? [PD] 198 * 199 * No, seems ok to me... [JRE] 200 * (I don't see any duplicate wakeups) 201 * 202 * Can't be used with block devices or raw_read/raw_write directly 203 * from the cdevsw/bdevsw tables because they couldn't have added 204 * the screq structure. [JRE] 205 */ 206 void 207 scsistrategy(bp) 208 struct buf *bp; 209 { 210 int err; 211 struct scsi_ioctl *si; 212 scsireq_t *screq; 213 struct scsi_link *sc_link; 214 int flags = 0; 215 int s; 216 217 si = si_find(bp); 218 if (!si) { 219 printf("user_strat: No ioctl\n"); 220 scsierr(bp, EINVAL); 221 return; 222 } 223 screq = si->si_screq; 224 sc_link = si->si_sc_link; 225 si_free(si); 226 if (!sc_link) { 227 printf("user_strat: No link pointer\n"); 228 scsierr(bp, EINVAL); 229 return; 230 } 231 SC_DEBUG(sc_link, SDEV_DB2, ("user_strategy\n")); 232 if (!screq) { 233 sc_print_addr(sc_link); 234 printf("No request block\n"); 235 scsierr(bp, EINVAL); 236 return; 237 } 238 239 /* 240 * We're in trouble if physio tried to break up the transfer. 241 */ 242 if (bp->b_bcount != screq->datalen) { 243 sc_print_addr(sc_link); 244 printf("physio split the request.. cannot proceed\n"); 245 scsierr(bp, EIO); 246 return; 247 } 248 249 if (screq->timeout == 0) { 250 scsierr(bp, EINVAL); 251 return; 252 } 253 254 if (screq->cmdlen > sizeof(struct scsi_generic)) { 255 sc_print_addr(sc_link); 256 printf("cmdlen too big\n"); 257 scsierr(bp, EFAULT); 258 return; 259 } 260 261 if (screq->flags & SCCMD_READ) 262 flags |= SCSI_DATA_IN; 263 if (screq->flags & SCCMD_WRITE) 264 flags |= SCSI_DATA_OUT; 265 if (screq->flags & SCCMD_TARGET) 266 flags |= SCSI_TARGET; 267 if (screq->flags & SCCMD_ESCAPE) 268 flags |= SCSI_ESCAPE; 269 270 err = scsi_scsi_cmd(sc_link, (struct scsi_generic *)screq->cmd, 271 screq->cmdlen, (u_char *)bp->b_data, screq->datalen, 272 0, /* user must do the retries *//* ignored */ 273 screq->timeout, bp, flags | SCSI_USER); 274 275 /* because there is a bp, scsi_scsi_cmd will return immediatly */ 276 if (err) { 277 scsierr(bp, err); 278 return; 279 } 280 SC_DEBUG(sc_link, SDEV_DB3, ("about to sleep\n")); 281 s = splbio(); 282 while (!(bp->b_flags & B_DONE)) 283 tsleep(bp, PRIBIO, "scistr", 0); 284 splx(s); 285 SC_DEBUG(sc_link, SDEV_DB3, ("back from sleep\n")); 286 return; 287 } 288 289 void 290 scsiminphys(bp) 291 struct buf *bp; 292 { 293 294 /*XXX*//* call the adapter's minphys */ 295 } 296 297 /* 298 * Something (e.g. another driver) has called us 299 * with an sc_link for a target/lun/adapter, and a scsi 300 * specific ioctl to perform, better try. 301 * If user-level type command, we must still be running 302 * in the context of the calling process 303 */ 304 int 305 scsi_do_ioctl(sc_link, cmd, addr, f) 306 struct scsi_link *sc_link; 307 int cmd; 308 caddr_t addr; 309 int f; 310 { 311 int error; 312 313 SC_DEBUG(sc_link, SDEV_DB2, ("scsi_do_ioctl(0x%x)\n", cmd)); 314 switch(cmd) { 315 #ifdef notyet /* XXXX Needs to be redone to use copyin/out! */ 316 case SCIOCCOMMAND: { 317 /* 318 * You won't believe this, but the arg copied in 319 * from the user space, is on the kernel stack 320 * for this process, so we can't write 321 * to it at interrupt time.. 322 * we need to copy it in and out! 323 * Make a static copy using malloc! 324 */ 325 scsireq_t *screq2 = (scsireq_t *)addr; 326 scsireq_t *screq = (scsireq_t *)addr; 327 int rwflag = (screq->flags & SCCMD_READ) ? B_READ : B_WRITE; 328 struct buf *bp; 329 caddr_t d_addr; 330 int len; 331 332 if ((unsigned int)screq < KERNBASE) { 333 screq = malloc(sizeof(scsireq_t), M_TEMP, M_WAITOK); 334 bcopy(screq2, screq, sizeof(scsireq_t)); 335 } 336 bp = malloc(sizeof(struct buf), M_TEMP, M_WAITOK); 337 bzero(bp, sizeof(struct buf)); 338 d_addr = screq->databuf; 339 bp->b_bcount = len = screq->datalen; 340 si = si_get(bp); 341 if (!si) { 342 scsierr(bp, EINTR); 343 return EINTR; 344 } 345 si->si_screq = screq; 346 si->si_sc_link = sc_link; 347 if (len) { 348 #ifdef __NetBSD__ 349 #error "dev, mincntfn & uio need defining" 350 error = physio(scsistrategy, bp, dev, rwflag, 351 mincntfn, uio); 352 #else 353 error = physio(scsistrategy, 0, bp, 0, rwflag, d_addr, 354 &len, curproc); 355 #endif 356 } else { 357 /* if no data, no need to translate it.. */ 358 bp->b_data = 0; 359 bp->b_dev = -1; /* irrelevant info */ 360 bp->b_flags = 0; 361 scsistrategy(bp); 362 error = bp->b_error; 363 } 364 free(bp, M_TEMP); 365 if ((unsigned int)screq2 < KERNBASE) { 366 bcopy(screq, screq2, sizeof(scsireq_t)); 367 free(screq, M_TEMP); 368 } 369 return error; 370 } 371 #endif 372 case SCIOCDEBUG: { 373 int level = *((int *)addr); 374 375 SC_DEBUG(sc_link, SDEV_DB3, ("debug set to %d\n", level)); 376 sc_link->flags &= ~SDEV_DBX; /* clear debug bits */ 377 if (level & 1) 378 sc_link->flags |= SDEV_DB1; 379 if (level & 2) 380 sc_link->flags |= SDEV_DB2; 381 if (level & 4) 382 sc_link->flags |= SDEV_DB3; 383 if (level & 8) 384 sc_link->flags |= SDEV_DB4; 385 return 0; 386 } 387 case SCIOCREPROBE: { 388 struct scsi_addr *sca = (struct scsi_addr *)addr; 389 390 return scsi_probe_busses(sca->scbus, sca->target, sca->lun); 391 } 392 case SCIOCRECONFIG: 393 case SCIOCDECONFIG: 394 return EINVAL; 395 case SCIOCIDENTIFY: { 396 struct scsi_addr *sca = (struct scsi_addr *)addr; 397 398 sca->scbus = sc_link->scsibus; 399 sca->target = sc_link->target; 400 sca->lun = sc_link->lun; 401 return 0; 402 } 403 default: 404 return ENOTTY; 405 } 406 407 #ifdef DIAGNOSTIC 408 panic("scsi_do_ioctl: impossible"); 409 #endif 410 } 411 412 void 413 scsierr(bp, error) 414 struct buf *bp; 415 int error; 416 { 417 418 bp->b_flags |= B_ERROR; 419 bp->b_error = error; 420 biodone(bp); 421 return; 422 } 423
Indexes created Mon Sep 22 13:09:51 GMT 2025