Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/dev/mscp/mscp.c
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1 /* $NetBSD: mscp.c,v 1.22 2005/02/27 00:27:32 perry Exp $ */ 2 3 /* 4 * Copyright (c) 1988 Regents of the University of California. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Chris Torek. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)mscp.c 7.5 (Berkeley) 12/16/90 35 */ 36 37 /* 38 * Copyright (c) 1996 Ludd, University of Lule}, Sweden. 39 * 40 * This code is derived from software contributed to Berkeley by 41 * Chris Torek. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. All advertising materials mentioning features or use of this software 52 * must display the following acknowledgement: 53 * This product includes software developed by the University of 54 * California, Berkeley and its contributors. 55 * 4. Neither the name of the University nor the names of its contributors 56 * may be used to endorse or promote products derived from this software 57 * without specific prior written permission. 58 * 59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 62 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 69 * SUCH DAMAGE. 70 * 71 * @(#)mscp.c 7.5 (Berkeley) 12/16/90 72 */ 73 74 /* 75 * MSCP generic driver routines 76 */ 77 78 #include <sys/cdefs.h> 79 __KERNEL_RCSID(0, "$NetBSD: mscp.c,v 1.22 2005/02/27 00:27:32 perry Exp $"); 80 81 #include <sys/param.h> 82 #include <sys/buf.h> 83 #include <sys/bufq.h> 84 #include <sys/kernel.h> 85 #include <sys/malloc.h> 86 #include <sys/device.h> 87 #include <sys/proc.h> 88 #include <sys/systm.h> 89 90 #include <machine/bus.h> 91 92 #include <dev/mscp/mscp.h> 93 #include <dev/mscp/mscpreg.h> 94 #include <dev/mscp/mscpvar.h> 95 96 #define PCMD PSWP /* priority for command packet waits */ 97 98 /* 99 * Get a command packet. Second argument is true iff we are 100 * to wait if necessary. Return NULL if none are available and 101 * we cannot wait. 102 */ 103 struct mscp * 104 mscp_getcp(mi, canwait) 105 struct mscp_softc *mi; 106 int canwait; 107 { 108 #define mri (&mi->mi_cmd) 109 struct mscp *mp; 110 int i; 111 int s = spluba(); 112 113 again: 114 /* 115 * Ensure that we have some command credits, and 116 * that the next command packet is free. 117 */ 118 if (mi->mi_credits <= MSCP_MINCREDITS) { 119 if (!canwait) { 120 splx(s); 121 return (NULL); 122 } 123 mi->mi_wantcredits = 1; 124 (void) tsleep(&mi->mi_wantcredits, PCMD, "mscpwcrd", 0); 125 goto again; 126 } 127 i = mri->mri_next; 128 if (mri->mri_desc[i] & MSCP_OWN) { 129 if (!canwait) { 130 splx(s); 131 return (NULL); 132 } 133 mi->mi_wantcmd = 1; 134 (void) tsleep(&mi->mi_wantcmd, PCMD, "mscpwcmd", 0); 135 goto again; 136 } 137 mi->mi_credits--; 138 mri->mri_desc[i] &= ~MSCP_INT; 139 mri->mri_next = (mri->mri_next + 1) % mri->mri_size; 140 splx(s); 141 mp = &mri->mri_ring[i]; 142 143 /* 144 * Initialise some often-zero fields. 145 * ARE THE LAST TWO NECESSARY IN GENERAL? IT SURE WOULD BE 146 * NICE IF DEC SOLD DOCUMENTATION FOR THEIR OWN CONTROLLERS. 147 */ 148 mp->mscp_msglen = MSCP_MSGLEN; 149 mp->mscp_flags = 0; 150 mp->mscp_modifier = 0; 151 mp->mscp_seq.seq_bytecount = 0; 152 mp->mscp_seq.seq_buffer = 0; 153 mp->mscp_seq.seq_mapbase = 0; 154 /*???*/ mp->mscp_sccc.sccc_errlgfl = 0; 155 /*???*/ mp->mscp_sccc.sccc_copyspd = 0; 156 return (mp); 157 #undef mri 158 } 159 160 #ifdef AVOID_EMULEX_BUG 161 int mscp_aeb_xor = 0x8000bb80; 162 #endif 163 164 /* 165 * Handle a response ring transition. 166 */ 167 void 168 mscp_dorsp(mi) 169 struct mscp_softc *mi; 170 { 171 struct device *drive; 172 struct mscp_device *me = mi->mi_me; 173 struct mscp_ctlr *mc = mi->mi_mc; 174 struct buf *bp; 175 struct mscp *mp; 176 struct mscp_xi *mxi; 177 int nextrsp; 178 int st, error; 179 extern struct mscp slavereply; 180 181 nextrsp = mi->mi_rsp.mri_next; 182 loop: 183 if (mi->mi_rsp.mri_desc[nextrsp] & MSCP_OWN) { 184 /* 185 * No more responses. Remember the next expected 186 * response index. Check to see if we have some 187 * credits back, and wake up sleepers if so. 188 */ 189 mi->mi_rsp.mri_next = nextrsp; 190 if (mi->mi_wantcredits && mi->mi_credits > MSCP_MINCREDITS) { 191 mi->mi_wantcredits = 0; 192 wakeup((caddr_t) &mi->mi_wantcredits); 193 } 194 return; 195 } 196 197 mp = &mi->mi_rsp.mri_ring[nextrsp]; 198 mi->mi_credits += MSCP_CREDITS(mp->mscp_msgtc); 199 /* 200 * Controllers are allowed to interrupt as any drive, so we 201 * must check the command before checking for a drive. 202 */ 203 if (mp->mscp_opcode == (M_OP_SETCTLRC | M_OP_END)) { 204 if ((mp->mscp_status & M_ST_MASK) == M_ST_SUCCESS) { 205 mi->mi_flags |= MSC_READY; 206 } else { 207 printf("%s: SETCTLRC failed: %d ", 208 mi->mi_dev.dv_xname, mp->mscp_status); 209 mscp_printevent(mp); 210 } 211 goto done; 212 } 213 214 /* 215 * Found a response. Update credit information. If there is 216 * nothing else to do, jump to `done' to get the next response. 217 */ 218 if (mp->mscp_unit >= mi->mi_driveno) { /* Must expand drive table */ 219 int tmpno = (mp->mscp_unit + 32) & ~31; 220 struct device **tmp = (struct device **) 221 malloc(tmpno * sizeof(tmp[0]), M_DEVBUF, M_NOWAIT|M_ZERO); 222 /* XXX tmp should be checked for NULL */ 223 if (mi->mi_driveno) { 224 memcpy(tmp, mi->mi_dp, mi->mi_driveno * sizeof(tmp[0])); 225 free(mi->mi_dp, M_DEVBUF); 226 } 227 mi->mi_driveno = tmpno; 228 mi->mi_dp = tmp; 229 } 230 231 drive = mi->mi_dp[mp->mscp_unit]; 232 233 switch (MSCP_MSGTYPE(mp->mscp_msgtc)) { 234 235 case MSCPT_SEQ: 236 break; 237 238 case MSCPT_DATAGRAM: 239 (*me->me_dgram)(drive, mp, mi); 240 goto done; 241 242 case MSCPT_CREDITS: 243 goto done; 244 245 case MSCPT_MAINTENANCE: 246 default: 247 printf("%s: unit %d: unknown message type 0x%x ignored\n", 248 mi->mi_dev.dv_xname, mp->mscp_unit, 249 MSCP_MSGTYPE(mp->mscp_msgtc)); 250 goto done; 251 } 252 253 /* 254 * Handle individual responses. 255 */ 256 st = mp->mscp_status & M_ST_MASK; 257 error = 0; 258 switch (mp->mscp_opcode) { 259 260 case M_OP_END: 261 /* 262 * The controller presents a bogus END packet when 263 * a read/write command is given with an illegal 264 * block number. This is contrary to the MSCP 265 * specification (ENDs are to be given only for 266 * invalid commands), but that is the way of it. 267 */ 268 if (st == M_ST_INVALCMD && mp->mscp_cmdref != 0) { 269 printf("%s: bad lbn (%d)?\n", drive->dv_xname, 270 (int)mp->mscp_seq.seq_lbn); 271 error = EIO; 272 goto rwend; 273 } 274 goto unknown; 275 276 case M_OP_ONLINE | M_OP_END: 277 /* 278 * Finished an ON LINE request. Call the driver to 279 * find out whether it succeeded. If so, mark it on 280 * line. 281 */ 282 (*me->me_online)(drive, mp); 283 break; 284 285 case M_OP_GETUNITST | M_OP_END: 286 /* 287 * Got unit status. If we are autoconfiguring, save 288 * the mscp struct so that mscp_attach know what to do. 289 * If the drive isn't configured, call config_found() 290 * to set it up, otherwise it's just a "normal" unit 291 * status. 292 */ 293 if (cold) 294 bcopy(mp, &slavereply, sizeof(struct mscp)); 295 296 if (mp->mscp_status == (M_ST_OFFLINE|M_OFFLINE_UNKNOWN)) 297 break; 298 299 if (drive == 0) { 300 struct drive_attach_args da; 301 302 da.da_mp = (struct mscp *)mp; 303 da.da_typ = mi->mi_type; 304 config_found(&mi->mi_dev, (void *)&da, mscp_print); 305 } else 306 /* Hack to avoid complaints */ 307 if (!(((mp->mscp_event & M_ST_MASK) == M_ST_AVAILABLE) 308 && cold)) 309 (*me->me_gotstatus)(drive, mp); 310 break; 311 312 case M_OP_AVAILATTN: 313 /* 314 * The drive went offline and we did not notice. 315 * Mark it off line now, to force an on line request 316 * next, so we can make sure it is still the same 317 * drive. 318 * 319 * IF THE UDA DRIVER HAS A COMMAND AWAITING UNIBUS 320 * RESOURCES, THAT COMMAND MAY GO OUT BEFORE THE ON 321 * LINE. IS IT WORTH FIXING?? 322 */ 323 #ifdef notyet 324 (*md->md_offline)(ui, mp); 325 #endif 326 break; 327 328 case M_OP_POS | M_OP_END: 329 case M_OP_WRITM | M_OP_END: 330 case M_OP_AVAILABLE | M_OP_END: 331 /* 332 * A non-data transfer operation completed. 333 */ 334 (*me->me_cmddone)(drive, mp); 335 break; 336 337 case M_OP_READ | M_OP_END: 338 case M_OP_WRITE | M_OP_END: 339 /* 340 * A transfer finished. Get the buffer, and release its 341 * map registers via ubadone(). If the command finished 342 * with an off line or available status, the drive went 343 * off line (the idiot controller does not tell us until 344 * it comes back *on* line, or until we try to use it). 345 */ 346 rwend: 347 #ifdef DIAGNOSTIC 348 if (mp->mscp_cmdref >= NCMD) { 349 /* 350 * No buffer means there is a bug somewhere! 351 */ 352 printf("%s: io done, but bad xfer number?\n", 353 drive->dv_xname); 354 mscp_hexdump(mp); 355 break; 356 } 357 #endif 358 359 if (mp->mscp_cmdref == -1) { 360 (*me->me_cmddone)(drive, mp); 361 break; 362 } 363 mxi = &mi->mi_xi[mp->mscp_cmdref]; 364 if (mxi->mxi_inuse == 0) 365 panic("mxi not inuse"); 366 bp = mxi->mxi_bp; 367 /* 368 * Mark any error-due-to-bad-LBN (via `goto rwend'). 369 * WHAT STATUS WILL THESE HAVE? IT SURE WOULD BE NICE 370 * IF DEC SOLD DOCUMENTATION FOR THEIR OWN CONTROLLERS. 371 */ 372 if (error) { 373 bp->b_flags |= B_ERROR; 374 bp->b_error = error; 375 } 376 if (st == M_ST_OFFLINE || st == M_ST_AVAILABLE) { 377 #ifdef notyet 378 (*md->md_offline)(ui, mp); 379 #endif 380 } 381 382 /* 383 * If the transfer has something to do with bad 384 * block forwarding, let the driver handle the 385 * rest. 386 */ 387 if ((bp->b_flags & B_BAD) != 0 && me->me_bb != NULL) { 388 (*me->me_bb)(drive, mp, bp); 389 goto out; 390 } 391 392 /* 393 * If the transfer failed, give the driver a crack 394 * at fixing things up. 395 */ 396 if (st != M_ST_SUCCESS) { 397 switch ((*me->me_ioerr)(drive, mp, bp)) { 398 399 case MSCP_DONE: /* fixed */ 400 break; 401 402 case MSCP_RESTARTED: /* still working on it */ 403 goto out; 404 405 case MSCP_FAILED: /* no luck */ 406 /* XXX must move to ra.c */ 407 mscp_printevent(mp); 408 break; 409 } 410 } 411 412 /* 413 * Set the residual count and mark the transfer as 414 * done. If the I/O wait queue is now empty, release 415 * the shared BDP, if any. 416 */ 417 bp->b_resid = bp->b_bcount - mp->mscp_seq.seq_bytecount; 418 bus_dmamap_unload(mi->mi_dmat, mxi->mxi_dmam); 419 420 (*mc->mc_ctlrdone)(mi->mi_dev.dv_parent); 421 (*me->me_iodone)(drive, bp); 422 out: 423 mxi->mxi_inuse = 0; 424 mi->mi_mxiuse |= (1 << mp->mscp_cmdref); 425 break; 426 427 case M_OP_REPLACE | M_OP_END: 428 /* 429 * A replace operation finished. Just let the driver 430 * handle it (if it does replaces). 431 */ 432 if (me->me_replace == NULL) 433 printf("%s: bogus REPLACE end\n", drive->dv_xname); 434 else 435 (*me->me_replace)(drive, mp); 436 break; 437 438 default: 439 /* 440 * If it is not one of the above, we cannot handle it. 441 * (And we should not have received it, for that matter.) 442 */ 443 unknown: 444 printf("%s: unknown opcode 0x%x status 0x%x ignored\n", 445 drive->dv_xname, mp->mscp_opcode, mp->mscp_status); 446 #ifdef DIAGNOSTIC 447 mscp_hexdump(mp); 448 #endif 449 break; 450 } 451 452 /* 453 * If the drive needs to be put back in the controller queue, 454 * do that now. (`bp' below ought to be `dp', but they are all 455 * struct buf *.) Note that b_active was cleared in the driver; 456 * we presume that there is something to be done, hence reassert it. 457 */ 458 #ifdef notyet /* XXX */ 459 if (ui->ui_flags & UNIT_REQUEUE) { 460 ... 461 } 462 #endif 463 done: 464 /* 465 * Give back the response packet, and take a look at the next. 466 */ 467 mp->mscp_msglen = MSCP_MSGLEN; 468 mi->mi_rsp.mri_desc[nextrsp] |= MSCP_OWN; 469 nextrsp = (nextrsp + 1) % mi->mi_rsp.mri_size; 470 goto loop; 471 } 472 473 /* 474 * Requeue outstanding transfers, e.g., after bus reset. 475 * Also requeue any drives that have on line or unit status 476 * info pending. 477 */ 478 void 479 mscp_requeue(mi) 480 struct mscp_softc *mi; 481 { 482 panic("mscp_requeue"); 483 } 484
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