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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 | /* * drivers/s390/cio/device_pgid.c * * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, * IBM Corporation * Author(s): Cornelia Huck(cohuck@de.ibm.com) * Martin Schwidefsky (schwidefsky@de.ibm.com) * * Path Group ID functions. */ #include <linux/config.h> #include <linux/module.h> #include <linux/init.h> #include <asm/ccwdev.h> #include <asm/cio.h> #include <asm/delay.h> #include <asm/lowcore.h> #include "cio.h" #include "cio_debug.h" #include "css.h" #include "device.h" /* * Start Sense Path Group ID helper function. Used in ccw_device_recog * and ccw_device_sense_pgid. */ static int __ccw_device_sense_pgid_start(struct ccw_device *cdev) { struct subchannel *sch; struct ccw1 *ccw; int ret; sch = to_subchannel(cdev->dev.parent); /* Setup sense path group id channel program. */ ccw = cdev->private->iccws; ccw->cmd_code = CCW_CMD_SENSE_PGID; ccw->cda = (__u32) __pa (&cdev->private->pgid); ccw->count = sizeof (struct pgid); ccw->flags = CCW_FLAG_SLI; /* Reset device status. */ memset(&cdev->private->irb, 0, sizeof(struct irb)); /* Try on every path. */ ret = -ENODEV; while (cdev->private->imask != 0) { /* Try every path multiple times. */ if (cdev->private->iretry-- > 0) { /* 0xe2d5c9c4 == ebcdic "SNID" */ ret = cio_start (sch, cdev->private->iccws, 0xE2D5C9C4, cdev->private->imask); /* ret is 0, -EBUSY, -EACCES or -ENODEV */ if (ret == -EBUSY) { CIO_MSG_EVENT(2, "SNID - device %04X, start_io() " "reports rc : %d, retrying ...\n", sch->schib.pmcw.dev, ret); udelay(100); continue; } if (ret != -EACCES) return ret; CIO_MSG_EVENT(2, "SNID - Device %04X on Subchannel " "%04X, lpm %02X, became 'not " "operational'\n", sch->schib.pmcw.dev, sch->irq, cdev->private->imask); } cdev->private->imask >>= 1; cdev->private->iretry = 5; } return ret; } void ccw_device_sense_pgid_start(struct ccw_device *cdev) { int ret; cdev->private->state = DEV_STATE_SENSE_PGID; cdev->private->imask = 0x80; cdev->private->iretry = 5; memset (&cdev->private->pgid, 0, sizeof (struct pgid)); ret = __ccw_device_sense_pgid_start(cdev); if (ret) ccw_device_sense_pgid_done(cdev, ret); } /* * Called from interrupt context to check if a valid answer * to Sense Path Group ID was received. */ static int __ccw_device_check_sense_pgid(struct ccw_device *cdev) { struct subchannel *sch; struct irb *irb; sch = to_subchannel(cdev->dev.parent); irb = &cdev->private->irb; if (irb->scsw.fctl & (SCSW_FCTL_HALT_FUNC | SCSW_FCTL_CLEAR_FUNC)) return -ETIME; if (irb->esw.esw0.erw.cons && (irb->ecw[0]&(SNS0_CMD_REJECT|SNS0_INTERVENTION_REQ))) { /* * If the device doesn't support the Sense Path Group ID * command further retries wouldn't help ... */ return -EOPNOTSUPP; } if (irb->esw.esw0.erw.cons) { CIO_MSG_EVENT(2, "SNID - device %04X, unit check, " "lpum %02X, cnt %02d, sns : " "%02X%02X%02X%02X %02X%02X%02X%02X ...\n", sch->schib.pmcw.dev, irb->esw.esw0.sublog.lpum, irb->esw.esw0.erw.scnt, irb->ecw[0], irb->ecw[1], irb->ecw[2], irb->ecw[3], irb->ecw[4], irb->ecw[5], irb->ecw[6], irb->ecw[7]); return -EAGAIN; } if (irb->scsw.cc == 3) { CIO_MSG_EVENT(2, "SNID - Device %04X on Subchannel " "%04X, lpm %02X, became 'not " "operational'\n", sch->schib.pmcw.dev, sch->irq, sch->orb.lpm); return -EACCES; } if (cdev->private->pgid.inf.ps.state2 == SNID_STATE2_RESVD_ELSE) { CIO_MSG_EVENT(2, "SNID - Device %04X on Subchannel %04X " "is reserved by someone else\n", sch->schib.pmcw.dev, sch->irq); return -EUSERS; } return 0; } /* * Got interrupt for Sense Path Group ID. */ void ccw_device_sense_pgid_irq(struct ccw_device *cdev, enum dev_event dev_event) { struct subchannel *sch; struct irb *irb; int ret; int opm; int i; irb = (struct irb *) __LC_IRB; /* Ignore unsolicited interrupts. */ if (irb->scsw.stctl == (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) return; if (ccw_device_accumulate_and_sense(cdev, irb) != 0) return; sch = to_subchannel(cdev->dev.parent); switch (__ccw_device_check_sense_pgid(cdev)) { /* 0, -ETIME, -EOPNOTSUPP, -EAGAIN, -EACCES or -EUSERS */ case 0: /* Sense Path Group ID successful. */ opm = sch->schib.pmcw.pim & sch->schib.pmcw.pam & sch->schib.pmcw.pom; for (i=0;i<8;i++) { if (opm == (0x80 << i)) { /* Don't group single path devices. */ cdev->private->options.pgroup = 0; break; } } if (cdev->private->pgid.inf.ps.state1 == SNID_STATE1_RESET) memcpy(&cdev->private->pgid, &global_pgid, sizeof(struct pgid)); /* fall through. */ case -EOPNOTSUPP: /* Sense Path Group ID not supported */ ccw_device_sense_pgid_done(cdev, -EOPNOTSUPP); break; case -ETIME: /* Sense path group id stopped by timeout. */ ccw_device_sense_pgid_done(cdev, -ETIME); break; case -EACCES: /* channel is not operational. */ sch->lpm &= ~cdev->private->imask; cdev->private->imask >>= 1; cdev->private->iretry = 5; /* Fall through. */ case -EAGAIN: /* Try again. */ ret = __ccw_device_sense_pgid_start(cdev); if (ret != 0 && ret != -EBUSY) ccw_device_sense_pgid_done(cdev, -ENODEV); break; case -EUSERS: /* device is reserved for someone else. */ ccw_device_sense_pgid_done(cdev, -EUSERS); break; } } /* * Path Group ID helper function. */ static int __ccw_device_do_pgid(struct ccw_device *cdev, __u8 func) { struct subchannel *sch; struct ccw1 *ccw; int ret; sch = to_subchannel(cdev->dev.parent); /* Setup sense path group id channel program. */ cdev->private->pgid.inf.fc = func; ccw = cdev->private->iccws; if (!cdev->private->flags.pgid_single) { cdev->private->pgid.inf.fc |= SPID_FUNC_MULTI_PATH; ccw->cmd_code = CCW_CMD_SUSPEND_RECONN; ccw->cda = 0; ccw->count = 0; ccw->flags = CCW_FLAG_SLI | CCW_FLAG_CC; ccw++; } else cdev->private->pgid.inf.fc |= SPID_FUNC_SINGLE_PATH; ccw->cmd_code = CCW_CMD_SET_PGID; ccw->cda = (__u32) __pa (&cdev->private->pgid); ccw->count = sizeof (struct pgid); ccw->flags = CCW_FLAG_SLI; /* Reset device status. */ memset(&cdev->private->irb, 0, sizeof(struct irb)); /* Try multiple times. */ ret = -ENODEV; while (cdev->private->iretry-- > 0) { /* 0xE2D7C9C4 == ebcdic "SPID" */ ret = cio_start (sch, cdev->private->iccws, 0xE2D7C9C4, cdev->private->imask); /* ret is 0, -EBUSY, -EACCES or -ENODEV */ if (ret == -EACCES) break; if (ret != -EBUSY) return ret; udelay(100); continue; } /* PGID command failed on this path. Switch it off. */ sch->lpm &= ~cdev->private->imask; sch->vpm &= ~cdev->private->imask; CIO_MSG_EVENT(2, "SPID - Device %04X on Subchannel " "%04X, lpm %02X, became 'not " "operational'\n", sch->schib.pmcw.dev, sch->irq, cdev->private->imask); return ret; } /* * Called from interrupt context to check if a valid answer * to Set Path Group ID was received. */ static int __ccw_device_check_pgid(struct ccw_device *cdev) { struct subchannel *sch; struct irb *irb; sch = to_subchannel(cdev->dev.parent); irb = &cdev->private->irb; if (irb->scsw.fctl & (SCSW_FCTL_HALT_FUNC | SCSW_FCTL_CLEAR_FUNC)) return -ETIME; if (irb->esw.esw0.erw.cons) { if (irb->ecw[0] & SNS0_CMD_REJECT) return -EOPNOTSUPP; /* Hmm, whatever happened, try again. */ CIO_MSG_EVENT(2, "SPID - device %04X, unit check, cnt %02d, " "sns : %02X%02X%02X%02X %02X%02X%02X%02X ...\n", sch->schib.pmcw.dev, irb->esw.esw0.erw.scnt, irb->ecw[0], irb->ecw[1], irb->ecw[2], irb->ecw[3], irb->ecw[4], irb->ecw[5], irb->ecw[6], irb->ecw[7]); return -EAGAIN; } if (irb->scsw.cc == 3) { CIO_MSG_EVENT(2, "SPID - Device %04X on Subchannel " "%04X, lpm %02X, became 'not " "operational'\n", sch->schib.pmcw.dev, sch->irq, cdev->private->imask); return -EACCES; } return 0; } static void __ccw_device_verify_start(struct ccw_device *cdev) { struct subchannel *sch; __u8 imask, func; int ret; sch = to_subchannel(cdev->dev.parent); while (sch->vpm != sch->lpm) { /* Find first unequal bit in vpm vs. lpm */ for (imask = 0x80; imask != 0; imask >>= 1) if ((sch->vpm & imask) != (sch->lpm & imask)) break; cdev->private->imask = imask; func = (sch->vpm & imask) ? SPID_FUNC_RESIGN : SPID_FUNC_ESTABLISH; ret = __ccw_device_do_pgid(cdev, func); if (ret == 0) return; cdev->private->iretry = 5; } ccw_device_verify_done(cdev, (sch->lpm != 0) ? 0 : -ENODEV); } /* * Got interrupt for Set Path Group ID. */ void ccw_device_verify_irq(struct ccw_device *cdev, enum dev_event dev_event) { struct subchannel *sch; struct irb *irb; irb = (struct irb *) __LC_IRB; /* Ignore unsolicited interrupts. */ if (irb->scsw.stctl == (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) return; if (ccw_device_accumulate_and_sense(cdev, irb) != 0) return; sch = to_subchannel(cdev->dev.parent); switch (__ccw_device_check_pgid(cdev)) { /* 0, -ETIME, -EAGAIN, -EOPNOTSUPP or -EACCES */ case 0: /* Establish or Resign Path Group done. Update vpm. */ if ((sch->lpm & cdev->private->imask) != 0) sch->vpm |= cdev->private->imask; else sch->vpm &= ~cdev->private->imask; cdev->private->iretry = 5; __ccw_device_verify_start(cdev); break; case -EOPNOTSUPP: /* * One of those strange devices which claim to be able * to do multipathing but not for Set Path Group ID. */ cdev->private->flags.pgid_single = 1; /* fall through. */ case -EAGAIN: /* Try again. */ __ccw_device_verify_start(cdev); break; case -ETIME: /* Set path group id stopped by timeout. */ ccw_device_verify_done(cdev, -ETIME); break; case -EACCES: /* channel is not operational. */ sch->lpm &= ~cdev->private->imask; sch->vpm &= ~cdev->private->imask; cdev->private->iretry = 5; __ccw_device_verify_start(cdev); break; } } void ccw_device_verify_start(struct ccw_device *cdev) { cdev->private->flags.pgid_single = 0; cdev->private->iretry = 5; __ccw_device_verify_start(cdev); } static void __ccw_device_disband_start(struct ccw_device *cdev) { struct subchannel *sch; int ret; sch = to_subchannel(cdev->dev.parent); while (cdev->private->imask != 0) { if (sch->lpm & cdev->private->imask) { ret = __ccw_device_do_pgid(cdev, SPID_FUNC_DISBAND); if (ret == 0) return; } cdev->private->iretry = 5; cdev->private->imask >>= 1; } ccw_device_verify_done(cdev, (sch->lpm != 0) ? 0 : -ENODEV); } /* * Got interrupt for Unset Path Group ID. */ void ccw_device_disband_irq(struct ccw_device *cdev, enum dev_event dev_event) { struct subchannel *sch; struct irb *irb; int ret; irb = (struct irb *) __LC_IRB; /* Ignore unsolicited interrupts. */ if (irb->scsw.stctl == (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) return; if (ccw_device_accumulate_and_sense(cdev, irb) != 0) return; sch = to_subchannel(cdev->dev.parent); ret = __ccw_device_check_pgid(cdev); switch (ret) { /* 0, -ETIME, -EAGAIN, -EOPNOTSUPP or -EACCES */ case 0: /* disband successful. */ sch->vpm = 0; ccw_device_disband_done(cdev, ret); break; case -EOPNOTSUPP: /* * One of those strange devices which claim to be able * to do multipathing but not for Unset Path Group ID. */ cdev->private->flags.pgid_single = 1; /* fall through. */ case -EAGAIN: /* Try again. */ __ccw_device_disband_start(cdev); break; case -ETIME: /* Set path group id stopped by timeout. */ ccw_device_disband_done(cdev, -ETIME); break; case -EACCES: /* channel is not operational. */ cdev->private->imask >>= 1; cdev->private->iretry = 5; __ccw_device_disband_start(cdev); break; } } void ccw_device_disband_start(struct ccw_device *cdev) { cdev->private->flags.pgid_single = 0; cdev->private->iretry = 5; cdev->private->imask = 0x80; __ccw_device_disband_start(cdev); } |