1 /* hp.c 6.3 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 goto done; 178 179 /* 180 * Error handling. Calculate location of error. 181 */ 182 bytesleft = MASKREG(mba->mba_bcr); 183 if (bytesleft) 184 bytesleft |= 0xffff0000; /* sxt */ 185 bn = io->i_bn + (io->i_cc + bytesleft) / sectsiz; 186 er1 = MASKREG(hpaddr->hper1); 187 er2 = MASKREG(hpaddr->hper2); 188 if (er1 & (HPER1_DCK|HPER1_ECH)) 189 bn--; /* Error is in Prev block */ 190 cn = bn/st->nspc; 191 sn = bn%st->nspc; 192 tn = sn/st->nsect; 193 sn = sn%st->nsect; 194 if (hpdebug[unit] & (HPF_ECCDEBUG|HPF_BSEDEBUG)) { 195 printf("hp error: (cyl,trk,sec)=(%d,%d,%d) ds=%b\n", 196 cn, tn, sn, MASKREG(hpaddr->hpds), HPDS_BITS); 197 printf("er1=%b er2=%b\n", er1, HPER1_BITS, er2, HPER2_BITS); 198 printf("bytes left: %d, of 0x%x, da 0x%x\n",-bytesleft, 199 hpaddr->hpof, hpaddr->hpda); 200 } 201 if (er1 & HPER1_HCRC) { 202 er1 &= ~(HPER1_HCE|HPER1_FER); 203 er2 &= ~HPER2_BSE; 204 } 205 /* 206 * Give up early if drive write locked. 207 */ 208 if (er1&HPER1_WLE) { 209 printf("hp%d: write locked\n", unit); 210 return (-1); 211 } 212 /* 213 * Interpret format error bit as a bad block on RP06's. 214 */ 215 if (MASKREG(er1) == HPER1_FER && RP06) 216 goto badsect; 217 218 /* 219 * If a hard error, or maximum retry count 220 * exceeded, clear controller state and 221 * pass back error to caller. 222 */ 223 if (++io->i_errcnt > 27 || (er1 & HPER1_HARD) || 224 (!ML11 && (er2 & HPER2_HARD))) { 225 /* 226 * The last ditch effort to bad sector forward 227 * below will probably fail since mba byte ctr 228 * (bcr) is different for BSE and ECC errors and 229 * the wrong block will be revectored to if one 230 * has 2 contiguous bad blocks and reads the second. 231 * For now, we can probably just let a header CRC 232 * error be handled like a BSE since no data will 233 * have been transferred and the bcr should the same 234 * as it would with a BSE error. 235 * --ghg. 236 */ 237 if (er1 & HPER1_HCRC) 238 if ((io->i_flgs&F_NBSF) == 0 && hpecc(io, BSE) == 0) 239 goto success; 240 hard0: 241 io->i_error = EHER; 242 if (mba->mba_sr & (MBSR_WCKUP|MBSR_WCKLWR)) 243 io->i_error = EWCK; 244 hard: 245 io->i_errblk = bn + ssect[unit]; 246 printf("hp error: (cyl,trk,sec)=(%d,%d,%d) ds=%b \n", 247 cn, tn, sn, MASKREG(hpaddr->hpds), HPDS_BITS); 248 printf("er1=%b er2=%b", er1, HPER1_BITS, er2, HPER2_BITS); 249 if (hpaddr->hpmr) 250 printf(" mr1=%o", MASKREG(hpaddr->hpmr)); 251 if (hpaddr->hpmr2) 252 printf(" mr2=%o", MASKREG(hpaddr->hpmr2)); 253 if (hpdebug[unit] & (HPF_BSEDEBUG|HPF_ECCDEBUG)) 254 printf(" dc=%d, da=0x%x",MASKREG(hpaddr->hpdc), 255 MASKREG(hpaddr->hpda)); 256 hpaddr->hpcs1 = HP_DCLR|HP_GO; 257 printf("\n"); 258 bytecnt = -1; 259 goto done; 260 261 } 262 /* 263 * Attempt to forward bad sectors on 264 * anything but an ML11. If drive 265 * supports skip sector handling, try to 266 * use it first; otherwise try the 267 * bad sector table. 268 */ 269 if ((er2 & HPER2_BSE) && !ML11) { 270 badsect: 271 if (!ssect[unit] && (er2&HPER2_SSE)) 272 goto skipsect; 273 if (io->i_flgs & F_NBSF) { 274 io->i_error = EBSE; 275 goto hard; 276 } 277 if (hpecc(io, BSE) == 0) 278 goto success; 279 io->i_error = EBSE; 280 goto hard; 281 } 282 283 /* 284 * Skip sector handling. 285 */ 286 if (RM80 && (er2 & HPER2_SSE)) { 287 skipsect: 288 (void) hpecc(io, SSE); 289 ssect[unit] = 1; 290 goto success; 291 } 292 /* 293 * ECC correction? 294 */ 295 if ((er1 & (HPER1_DCK|HPER1_ECH)) == HPER1_DCK) { 296 if (hpecc(io, ECC) == 0) 297 goto success; 298 io->i_error = EECC; 299 io->i_errblk = bn + ssect[unit]; 300 return (-1); 301 } 302 #ifdef F_SEVRE 303 if (io->i_flgs & F_SEVRE) 304 goto hard; 305 #endif 306 if (ML11 && (io->i_errcnt >= 16)) 307 goto hard0; 308 /* fall thru to retry */ 309 hpaddr->hpcs1 = HP_DCLR|HP_GO; 310 HPWAIT(hpaddr); 311 312 /* 313 * Every fourth retry recalibrate. 314 */ 315 if (((io->i_errcnt & 07) == 4) ) { 316 hpaddr->hpcs1 = HP_RECAL|HP_GO; 317 HPWAIT(hpaddr); 318 hpaddr->hpdc = cn; 319 hpaddr->hpcs1 = HP_SEEK|HP_GO; 320 HPWAIT(hpaddr); 321 } 322 323 if (io->i_errcnt >= 16 && (io->i_flgs & F_READ)) { 324 hpaddr->hpof = hp_offset[io->i_errcnt & 017]|HPOF_FMT22; 325 hpaddr->hpcs1 = HP_OFFSET|HP_GO; 326 HPWAIT(hpaddr); 327 } 328 if (hpdebug[unit] & (HPF_ECCDEBUG|HPF_BSEDEBUG)) 329 printf("restart: bn=%d, cc=%d, ma=0x%x hprecal=%d\n", 330 io->i_bn, io->i_cc, io->i_ma, hprecal); 331 goto restart; /* retry whole transfer --ghg */ 332 333 success: 334 /* 335 * On successful error recovery, bump 336 * block number to advance to next portion 337 * of i/o transfer. 338 */ 339 bn++; 340 if ((bn-startblock) * sectsiz < bytecnt) { 341 io->i_bn = bn; 342 io->i_ma = membase + (io->i_bn - startblock)*sectsiz; 343 io->i_cc = bytecnt - (io->i_bn - startblock)*sectsiz; 344 if (hpdebug[unit] & (HPF_ECCDEBUG|HPF_BSEDEBUG)) 345 printf("restart: bn=%d, cc=%d, ma=0x%x hprecal=%d\n", 346 io->i_bn, io->i_cc, io->i_ma, hprecal); 347 goto restart; 348 } 349 done: 350 if (io->i_errcnt >= 16) { 351 hpaddr->hpcs1 = HP_RTC|HP_GO; 352 while (hpaddr->hpds & HPDS_PIP) 353 ; 354 } 355 return (bytecnt); 356 } 357 358 hpecc(io, flag) 359 register struct iob *io; 360 int flag; 361 { 362 register unit = io->i_unit; 363 register struct mba_regs *mbp = mbamba(unit); 364 register struct hpdevice *rp = (struct hpdevice *)mbadrv(unit); 365 register struct st *st = &hpst[hp_type[unit]]; 366 int npf, bn, cn, tn, sn, bcr; 367 368 bcr = MASKREG(mbp->mba_bcr); 369 if (bcr) 370 bcr |= 0xffff0000; /* sxt */ 371 npf = (bcr + io->i_cc) / sectsiz; /* # sectors read */ 372 if (flag == ECC) 373 npf--; /* Error is in prev block --ghg */ 374 bn = io->i_bn + npf + ssect[unit]; /* physical block #*/ 375 if (hpdebug[unit]&HPF_ECCDEBUG) 376 printf("bcr=%d npf=%d ssect=%d sectsiz=%d i_cc=%d\n", 377 bcr, npf, ssect[unit], sectsiz, io->i_cc); 378 /* 379 * ECC correction logic. 380 */ 381 if (flag == ECC) { 382 register int i; 383 caddr_t addr; 384 int bit, o, mask, ecccnt = 0; 385 386 printf("hp%d: soft ecc sn%d\n", unit, bn); 387 mask = MASKREG(rp->hpec2); 388 i = MASKREG(rp->hpec1) - 1; /* -1 makes 0 origin */ 389 bit = i&07; 390 o = (i & ~07) >> 3; 391 rp->hpcs1 = HP_DCLR | HP_GO; 392 while (o <sectsiz && npf*sectsiz + o < io->i_cc && bit > -11) { 393 addr = io->i_ma + (npf*sectsiz) + o; 394 /* 395 * No data transfer occurs with a write check, 396 * so don't correct the resident copy of data. 397 */ 398 if ((io->i_flgs & (F_CHECK|F_HCHECK)) == 0) { 399 if (hpdebug[unit] & HPF_ECCDEBUG) 400 printf("addr=%x old=%x ", addr, 401 (*addr & 0xff)); 402 *addr ^= (mask << bit); 403 if (hpdebug[unit] & HPF_ECCDEBUG) 404 printf("new=%x\n",(*addr & 0xff)); 405 } 406 o++, bit -= 8; 407 if ((io->i_flgs & F_ECCLM) && ecccnt++ >= MAXECC) 408 return (1); 409 } 410 #ifdef F_SEVRE 411 if (io->i_flgs & F_SEVRE) 412 return(1); 413 #endif 414 return (0); 415 } 416 417 /* 418 * Skip sector error. 419 * Set skip-sector-inhibit and 420 * read next sector 421 */ 422 if (flag == SSE) { 423 rp->hpcs1 = HP_DCLR | HP_GO; 424 HPWAIT(rp); 425 rp->hpof |= HPOF_SSEI; 426 return (0); 427 } 428 429 /* 430 * Bad block forwarding. 431 */ 432 if (flag == BSE) { 433 int bbn; 434 435 rp->hpcs1 = HP_DCLR | HP_GO; 436 if (hpdebug[unit] & HPF_BSEDEBUG) 437 printf("hpecc: BSE @ bn %d\n", bn); 438 cn = bn/st->nspc; 439 sn = bn%st->nspc; 440 tn = sn/st->nsect; 441 sn = sn%st->nsect; 442 bcr += sectsiz; 443 if ((bbn = isbad(&hpbad[unit], cn, tn, sn)) < 0) 444 return (1); 445 bbn = st->ncyl*st->nspc - st->nsect - 1 - bbn; 446 cn = bbn/st->nspc; 447 sn = bbn%st->nspc; 448 tn = sn/st->nsect; 449 sn = sn%st->nsect; 450 io->i_cc = sectsiz; 451 io->i_ma += npf*sectsiz; 452 if (hpdebug[unit] & HPF_BSEDEBUG) 453 printf("revector to cn %d tn %d sn %d\n", cn, tn, sn); 454 rp->hpof &= ~HPOF_SSEI; 455 mbp->mba_sr = -1; 456 rp->hpdc = cn; 457 rp->hpda = (tn<<8) + sn; 458 mbastart(io,io->i_flgs); 459 io->i_errcnt = 0; 460 HPWAIT(rp); 461 return (rp->hpds&HPDS_ERR); 462 } 463 printf("hpecc: flag=%d\n", flag); 464 return (1); 465 } 466 467 /*ARGSUSED*/ 468 hpioctl(io, cmd, arg) 469 struct iob *io; 470 int cmd; 471 caddr_t arg; 472 { 473 register unit = io->i_unit; 474 struct st *st = &hpst[hp_type[unit]], *tmp; 475 struct mba_drv *drv = mbadrv(unit); 476 int flag; 477 478 switch(cmd) { 479 480 case SAIODEBUG: 481 flag = (int)arg; 482 if (flag > 0) 483 hpdebug[unit] |= flag; 484 else 485 hpdebug[unit] &= ~flag; 486 return (0); 487 488 case SAIODEVDATA: 489 if ((drv->mbd_dt&MBDT_TAP) == 0) { 490 tmp = (struct st *)arg; 491 *tmp = *st; 492 return (0); 493 } 494 return (ECMD); 495 496 case SAIOSSI: /* skip-sector-inhibit */ 497 if (drv->mbd_dt&MBDT_TAP) 498 return (ECMD); 499 if ((io->i_flgs&F_SSI) == 0) { 500 /* make sure this is done once only */ 501 io->i_flgs |= F_SSI; 502 st->nsect++; 503 st->nspc += st->ntrak; 504 } 505 return (0); 506 507 case SAIONOSSI: /* remove skip-sector-inhibit */ 508 if (io->i_flgs & F_SSI) { 509 io->i_flgs &= ~F_SSI; 510 drv->mbd_of &= ~HPOF_SSEI; 511 st->nsect--; 512 st->nspc -= st->ntrak; 513 } 514 return(0); 515 516 case SAIOSSDEV: /* drive have skip sector? */ 517 return (RM80 ? 0 : ECMD); 518 } 519 return (ECMD); 520 } 521