1 /* hp.c 6.2 83/09/23 */ 2 3 /* 4 * RP??/RM?? disk driver 5 * with ECC handling and bad block forwarding. 6 * Also supports header io operations and 7 * commands to write check header and data. 8 */ 9 #include "../h/param.h" 10 #include "../h/inode.h" 11 #include "../h/fs.h" 12 #include "../h/dkbad.h" 13 14 #include "../vax/pte.h" 15 #include "../vaxmba/hpreg.h" 16 #include "../vaxmba/mbareg.h" 17 18 #include "saio.h" 19 #include "savax.h" 20 21 #define MASKREG(reg) ((reg)&0xffff) 22 23 #define MAXBADDESC 126 24 #define SECTSIZ 512 /* sector size in bytes */ 25 #define HDRSIZ 4 /* number of bytes in sector header */ 26 #define MAXECC 5 /* max # bits allow in ecc error w/ F_ECCLM */ 27 28 char hp_type[MAXNMBA*8] = { 0 }; 29 extern struct st hpst[]; 30 31 short hptypes[] = { 32 MBDT_RM03, 33 MBDT_RM05, 34 MBDT_RP06, 35 MBDT_RM80, 36 MBDT_RP05, 37 MBDT_RP07, 38 MBDT_ML11A, 39 MBDT_ML11B, 40 -1, /* 9755 */ 41 -1, /* 9730 */ 42 -1, /* Capricorn */ 43 -1, /* Eagle */ 44 MBDT_RM02, /* actually something else */ 45 -1, /* 9300 */ 46 0 47 }; 48 49 #define RP06 (hptypes[hp_type[unit]] <= MBDT_RP06) 50 #define ML11 (hptypes[hp_type[unit]] == MBDT_ML11A) 51 #define RM80 (hptypes[hp_type[unit]] == MBDT_RM80) 52 53 u_char hp_offset[16] = { 54 HPOF_P400, HPOF_M400, HPOF_P400, HPOF_M400, 55 HPOF_P800, HPOF_M800, HPOF_P800, HPOF_M800, 56 HPOF_P1200, HPOF_M1200, HPOF_P1200, HPOF_M1200, 57 0, 0, 0, 0, 58 }; 59 60 struct dkbad hpbad[MAXNMBA*8]; 61 int ssect[MAXNMBA*8]; /* 1 when on track w/skip sector */ 62 63 int hpdebug[MAXNMBA*8]; 64 #define HPF_BSEDEBUG 01 /* debugging bad sector forwarding */ 65 #define HPF_ECCDEBUG 02 /* debugging ecc correction */ 66 67 int sectsiz; 68 69 /* 70 * When awaiting command completion, don't 71 * hang on to the status register since 72 * this ties up some controllers. 73 */ 74 #define HPWAIT(addr) \ 75 while ((((addr)->hpds)&HPDS_DRY)==0) DELAY(500); 76 77 hpopen(io) 78 register struct iob *io; 79 { 80 register unit = io->i_unit; 81 struct hpdevice *hpaddr = (struct hpdevice *)mbadrv(unit); 82 register struct st *st; 83 84 mbainit(UNITTOMBA(unit)); 85 if (hp_type[unit] == 0) { 86 register i, type = hpaddr->hpdt & MBDT_TYPE; 87 struct iob tio; 88 89 for (i = 0; hptypes[i]; i++) 90 if (hptypes[i] == type) 91 goto found; 92 _stop("unknown drive type"); 93 found: 94 hpaddr->hpcs1 = HP_DCLR|HP_GO; /* init drive */ 95 hpaddr->hpcs1 = HP_PRESET|HP_GO; 96 if (!ML11) 97 hpaddr->hpof = HPOF_FMT22; 98 hp_type[unit] = hpmaptype(hpaddr, i, unit); 99 /* 100 * Read in the bad sector table. 101 */ 102 st = &hpst[hp_type[unit]]; 103 tio = *io; 104 tio.i_bn = st->nspc * st->ncyl - st->nsect; 105 tio.i_ma = (char *)&hpbad[unit]; 106 tio.i_cc = sizeof (struct dkbad); 107 tio.i_flgs |= F_RDDATA; 108 for (i = 0; i < 5; i++) { 109 if (hpstrategy(&tio, READ) == sizeof (struct dkbad)) 110 break; 111 tio.i_bn += 2; 112 } 113 if (i == 5) { 114 printf("Unable to read bad sector table\n"); 115 for (i = 0; i < MAXBADDESC; i++) { 116 hpbad[unit].bt_bad[i].bt_cyl = -1; 117 hpbad[unit].bt_bad[i].bt_trksec = -1; 118 } 119 } 120 } 121 if (io->i_boff < 0 || io->i_boff > 7 || 122 st->off[io->i_boff]== -1) 123 _stop("hp bad minor"); 124 io->i_boff = st->off[io->i_boff] * st->nspc; 125 } 126 127 hpstrategy(io, func) 128 register struct iob *io; 129 { 130 register unit = io->i_unit; 131 struct mba_regs *mba = mbamba(unit); 132 daddr_t bn, startblock; 133 struct hpdevice *hpaddr = (struct hpdevice *)mbadrv(unit); 134 struct st *st = &hpst[hp_type[unit]]; 135 int cn, tn, sn, bytecnt, bytesleft; 136 char *membase; 137 int er1, er2, hprecal; 138 139 sectsiz = SECTSIZ; 140 if ((io->i_flgs & (F_HDR|F_HCHECK)) != 0) 141 sectsiz += HDRSIZ; 142 if ((hpaddr->hpds & HPDS_VV) == 0) { 143 hpaddr->hpcs1 = HP_DCLR|HP_GO; 144 hpaddr->hpcs1 = HP_PRESET|HP_GO; 145 if (!ML11) 146 hpaddr->hpof = HPOF_FMT22; 147 } 148 io->i_errcnt = 0; 149 ssect[unit] = 0; 150 bytecnt = io->i_cc; 151 membase = io->i_ma; 152 startblock = io->i_bn; 153 hprecal = 0; 154 155 restart: 156 bn = io->i_bn; 157 cn = bn/st->nspc; 158 sn = bn%st->nspc; 159 tn = sn/st->nsect; 160 sn = sn%st->nsect + ssect[unit]; 161 162 HPWAIT(hpaddr); 163 mba->mba_sr = -1; 164 if (ML11) 165 hpaddr->hpda = bn; 166 else { 167 hpaddr->hpdc = cn; 168 hpaddr->hpda = (tn << 8) + sn; 169 } 170 if (mbastart(io, func) != 0) /* start transfer */ 171 return (-1); 172 HPWAIT(hpaddr); 173 /* 174 * Successful data transfer, return. 175 */ 176 if ((hpaddr->hpds&HPDS_ERR) == 0 && (mba->mba_sr&MBSR_EBITS) == 0) { 177 if (io->i_errcnt >= 16) { 178 hpaddr->hpcs1 = HP_RTC|HP_GO; 179 while (hpaddr->hpds & HPDS_PIP) 180 ; 181 } 182 return (bytecnt); 183 } 184 185 /* 186 * Error handling. Calculate location of error. 187 */ 188 bytesleft = MASKREG(mba->mba_bcr); 189 if (bytesleft) 190 bytesleft |= 0xffff0000; /* sxt */ 191 bn = io->i_bn + (io->i_cc + bytesleft) / sectsiz; 192 er1 = MASKREG(hpaddr->hper1); 193 er2 = MASKREG(hpaddr->hper2); 194 if (er1 & (HPER1_DCK|HPER1_ECH)) 195 bn--; /* Error is in Prev block */ 196 cn = bn/st->nspc; 197 sn = bn%st->nspc; 198 tn = sn/st->nsect; 199 sn = sn%st->nsect; 200 if (hpdebug[unit] & (HPF_ECCDEBUG|HPF_BSEDEBUG)) { 201 printf("hp error: (cyl,trk,sec)=(%d,%d,%d) ds=%b\n", 202 cn, tn, sn, MASKREG(hpaddr->hpds), HPDS_BITS); 203 printf("er1=%b er2=%b\n", er1, HPER1_BITS, er2, HPER2_BITS); 204 printf("bytes left: %d, of 0x%x, da 0x%x\n",-bytesleft, 205 hpaddr->hpof, hpaddr->hpda); 206 } 207 if (er1 & HPER1_HCRC) { 208 er1 &= ~(HPER1_HCE|HPER1_FER); 209 er2 &= ~HPER2_BSE; 210 } 211 /* 212 * Give up early if drive write locked. 213 */ 214 if (er1&HPER1_WLE) { 215 printf("hp%d: write locked\n", unit); 216 return (-1); 217 } 218 /* 219 * Interpret format error bit as a bad block on RP06's. 220 */ 221 if (MASKREG(er1) == HPER1_FER && RP06) 222 goto badsect; 223 224 /* 225 * If a hard error, or maximum retry count 226 * exceeded, clear controller state and 227 * pass back error to caller. 228 */ 229 if (++io->i_errcnt > 27 || (er1 & HPER1_HARD) || 230 (!ML11 && (er2 & HPER2_HARD))) { 231 /* 232 * The last ditch effort to bad sector forward 233 * below will probably fail since mba byte ctr 234 * (bcr) is different for BSE and ECC errors and 235 * the wrong block will be revectored to if one 236 * has 2 contiguous bad blocks and reads the second. 237 * For now, we can probably just let a header CRC 238 * error be handled like a BSE since no data will 239 * have been transferred and the bcr should the same 240 * as it would with a BSE error. 241 * --ghg. 242 */ 243 if (er1 & HPER1_HCRC) 244 if ((io->i_flgs&F_NBSF) == 0 && hpecc(io, BSE) == 0) 245 goto success; 246 hard0: 247 io->i_error = EHER; 248 if (mba->mba_sr & (MBSR_WCKUP|MBSR_WCKLWR)) 249 io->i_error = EWCK; 250 hard: 251 io->i_errblk = bn + ssect[unit]; 252 printf("hp error: (cyl,trk,sec)=(%d,%d,%d) ds=%b \n", 253 cn, tn, sn, MASKREG(hpaddr->hpds), HPDS_BITS); 254 printf("er1=%b er2=%b", er1, HPER1_BITS, er2, HPER2_BITS); 255 if (hpaddr->hpmr) 256 printf(" mr1=%o", MASKREG(hpaddr->hpmr)); 257 if (hpaddr->hpmr2) 258 printf(" mr2=%o", MASKREG(hpaddr->hpmr2)); 259 if (hpdebug[unit] & (HPF_BSEDEBUG|HPF_ECCDEBUG)) 260 printf(" dc=%d, da=0x%x",MASKREG(hpaddr->hpdc), 261 MASKREG(hpaddr->hpda)); 262 hpaddr->hpcs1 = HP_DCLR|HP_GO; 263 printf("\n"); 264 return (-1); 265 266 } 267 /* 268 * Attempt to forward bad sectors on 269 * anything but an ML11. If drive 270 * supports skip sector handling, try to 271 * use it first; otherwise try the 272 * bad sector table. 273 */ 274 if ((er2 & HPER2_BSE) && !ML11) { 275 badsect: 276 if (!ssect[unit] && (er2&HPER2_SSE)) 277 goto skipsect; 278 if (io->i_flgs & F_NBSF) { 279 io->i_error = EBSE; 280 goto hard; 281 } 282 if (hpecc(io, BSE) == 0) 283 goto success; 284 io->i_error = EBSE; 285 goto hard; 286 } 287 288 /* 289 * Skip sector handling. 290 */ 291 if (RM80 && (er2 & HPER2_SSE)) { 292 skipsect: 293 (void) hpecc(io, SSE); 294 ssect[unit] = 1; 295 goto success; 296 } 297 /* 298 * ECC correction? 299 */ 300 if ((er1 & (HPER1_DCK|HPER1_ECH)) == HPER1_DCK) { 301 if (hpecc(io, ECC) == 0) 302 goto success; 303 io->i_error = EECC; 304 io->i_errblk = bn + ssect[unit]; 305 return (-1); 306 } 307 #ifdef F_SEVRE 308 if (io->i_flgs & F_SEVRE) 309 goto hard; 310 #endif 311 if (ML11 && (io->i_errcnt >= 16)) 312 goto hard0; 313 /* fall thru to retry */ 314 hpaddr->hpcs1 = HP_DCLR|HP_GO; 315 HPWAIT(hpaddr); 316 317 /* 318 * Every fourth retry recalibrate. 319 */ 320 if (((io->i_errcnt & 07) == 4) ) { 321 hpaddr->hpcs1 = HP_RECAL|HP_GO; 322 HPWAIT(hpaddr); 323 hpaddr->hpdc = cn; 324 hpaddr->hpcs1 = HP_SEEK|HP_GO; 325 HPWAIT(hpaddr); 326 } 327 328 if (io->i_errcnt >= 16 && (io->i_flgs & F_READ)) { 329 hpaddr->hpof = hp_offset[io->i_errcnt & 017]|HPOF_FMT22; 330 hpaddr->hpcs1 = HP_OFFSET|HP_GO; 331 HPWAIT(hpaddr); 332 } 333 if (hpdebug[unit] & (HPF_ECCDEBUG|HPF_BSEDEBUG)) 334 printf("restart: bn=%d, cc=%d, ma=0x%x hprecal=%d\n", 335 io->i_bn, io->i_cc, io->i_ma, hprecal); 336 goto restart; /* retry whole transfer --ghg */ 337 338 success: 339 /* 340 * On successful error recovery, bump 341 * block number to advance to next portion 342 * of i/o transfer. 343 */ 344 bn++; 345 if ((bn-startblock) * sectsiz < bytecnt) { 346 io->i_bn = bn; 347 io->i_ma = membase + (io->i_bn - startblock)*sectsiz; 348 io->i_cc = bytecnt - (io->i_bn - startblock)*sectsiz; 349 if (hpdebug[unit] & (HPF_ECCDEBUG|HPF_BSEDEBUG)) 350 printf("restart: bn=%d, cc=%d, ma=0x%x hprecal=%d\n", 351 io->i_bn, io->i_cc, io->i_ma, hprecal); 352 goto restart; 353 } 354 if (io->i_errcnt >= 16) { 355 hpaddr->hpcs1 = HP_RTC|HP_GO; 356 while (hpaddr->hpds & HPDS_PIP) 357 ; 358 } 359 return (bytecnt); 360 } 361 362 hpecc(io, flag) 363 register struct iob *io; 364 int flag; 365 { 366 register unit = io->i_unit; 367 register struct mba_regs *mbp = mbamba(unit); 368 register struct hpdevice *rp = (struct hpdevice *)mbadrv(unit); 369 register struct st *st = &hpst[hp_type[unit]]; 370 int npf, bn, cn, tn, sn, bcr; 371 372 bcr = MASKREG(mbp->mba_bcr); 373 if (bcr) 374 bcr |= 0xffff0000; /* sxt */ 375 npf = (bcr + io->i_cc) / sectsiz; /* # sectors read */ 376 if (flag == ECC) 377 npf--; /* Error is in prev block --ghg */ 378 bn = io->i_bn + npf + ssect[unit]; /* physical block #*/ 379 if (hpdebug[unit]&HPF_ECCDEBUG) 380 printf("bcr=%d npf=%d ssect=%d sectsiz=%d i_cc=%d\n", 381 bcr, npf, ssect[unit], sectsiz, io->i_cc); 382 /* 383 * ECC correction logic. 384 */ 385 if (flag == ECC) { 386 register int i; 387 caddr_t addr; 388 int bit, o, mask, ecccnt = 0; 389 390 printf("hp%d: soft ecc sn%d\n", unit, bn); 391 mask = MASKREG(rp->hpec2); 392 i = MASKREG(rp->hpec1) - 1; /* -1 makes 0 origin */ 393 bit = i&07; 394 o = (i & ~07) >> 3; 395 rp->hpcs1 = HP_DCLR | HP_GO; 396 while (o <sectsiz && npf*sectsiz + o < io->i_cc && bit > -11) { 397 addr = io->i_ma + (npf*sectsiz) + o; 398 /* 399 * No data transfer occurs with a write check, 400 * so don't correct the resident copy of data. 401 */ 402 if ((io->i_flgs & (F_CHECK|F_HCHECK)) == 0) { 403 if (hpdebug[unit] & HPF_ECCDEBUG) 404 printf("addr=%x old=%x ", addr, 405 (*addr & 0xff)); 406 *addr ^= (mask << bit); 407 if (hpdebug[unit] & HPF_ECCDEBUG) 408 printf("new=%x\n",(*addr & 0xff)); 409 } 410 o++, bit -= 8; 411 if ((io->i_flgs & F_ECCLM) && ecccnt++ >= MAXECC) 412 return (1); 413 } 414 #ifdef F_SEVRE 415 if (io->i_flgs & F_SEVRE) 416 return(1); 417 #endif 418 return (0); 419 } 420 421 /* 422 * Skip sector error. 423 * Set skip-sector-inhibit and 424 * read next sector 425 */ 426 if (flag == SSE) { 427 rp->hpcs1 = HP_DCLR | HP_GO; 428 HPWAIT(rp); 429 rp->hpof |= HPOF_SSEI; 430 return (0); 431 } 432 433 /* 434 * Bad block forwarding. 435 */ 436 if (flag == BSE) { 437 int bbn; 438 439 rp->hpcs1 = HP_DCLR | HP_GO; 440 if (hpdebug[unit] & HPF_BSEDEBUG) 441 printf("hpecc: BSE @ bn %d\n", bn); 442 cn = bn/st->nspc; 443 sn = bn%st->nspc; 444 tn = sn/st->nsect; 445 sn = sn%st->nsect; 446 bcr += sectsiz; 447 if ((bbn = isbad(&hpbad[unit], cn, tn, sn)) < 0) 448 return (1); 449 bbn = st->ncyl*st->nspc - st->nsect - 1 - bbn; 450 cn = bbn/st->nspc; 451 sn = bbn%st->nspc; 452 tn = sn/st->nsect; 453 sn = sn%st->nsect; 454 io->i_cc = sectsiz; 455 io->i_ma += npf*sectsiz; 456 if (hpdebug[unit] & HPF_BSEDEBUG) 457 printf("revector to cn %d tn %d sn %d\n", cn, tn, sn); 458 rp->hpof &= ~HPOF_SSEI; 459 mbp->mba_sr = -1; 460 rp->hpdc = cn; 461 rp->hpda = (tn<<8) + sn; 462 mbastart(io,io->i_flgs); 463 io->i_errcnt = 0; 464 HPWAIT(rp); 465 return (rp->hpds&HPDS_ERR); 466 } 467 printf("hpecc: flag=%d\n", flag); 468 return (1); 469 } 470 471 /*ARGSUSED*/ 472 hpioctl(io, cmd, arg) 473 struct iob *io; 474 int cmd; 475 caddr_t arg; 476 { 477 register unit = io->i_unit; 478 struct st *st = &hpst[hp_type[unit]], *tmp; 479 struct mba_drv *drv = mbadrv(unit); 480 int flag; 481 482 switch(cmd) { 483 484 case SAIODEBUG: 485 flag = (int)arg; 486 if (flag > 0) 487 hpdebug[unit] |= flag; 488 else 489 hpdebug[unit] &= ~flag; 490 return (0); 491 492 case SAIODEVDATA: 493 if ((drv->mbd_dt&MBDT_TAP) == 0) { 494 tmp = (struct st *)arg; 495 *tmp = *st; 496 return (0); 497 } 498 return (ECMD); 499 500 case SAIOSSI: /* skip-sector-inhibit */ 501 if (drv->mbd_dt&MBDT_TAP) 502 return (ECMD); 503 if ((io->i_flgs&F_SSI) == 0) { 504 /* make sure this is done once only */ 505 io->i_flgs |= F_SSI; 506 st->nsect++; 507 st->nspc += st->ntrak; 508 } 509 return (0); 510 511 case SAIONOSSI: /* remove skip-sector-inhibit */ 512 if (io->i_flgs & F_SSI) { 513 io->i_flgs &= ~F_SSI; 514 drv->mbd_of &= ~HPOF_SSEI; 515 st->nsect--; 516 st->nspc -= st->ntrak; 517 } 518 return(0); 519 520 case SAIOSSDEV: /* drive have skip sector? */ 521 return (RM80 ? 0 : ECMD); 522 } 523 return (ECMD); 524 } 525