Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * drivers/s390/cio/cio.c |
| 3 | * S/390 common I/O routines -- low level i/o calls |
Peter Oberparleiter | 0b642ed | 2005-05-01 08:58:58 -0700 | [diff] [blame^] | 4 | * $Revision: 1.133 $ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * |
| 6 | * Copyright (C) 1999-2002 IBM Deutschland Entwicklung GmbH, |
| 7 | * IBM Corporation |
| 8 | * Author(s): Ingo Adlung (adlung@de.ibm.com) |
| 9 | * Cornelia Huck (cohuck@de.ibm.com) |
| 10 | * Arnd Bergmann (arndb@de.ibm.com) |
| 11 | * Martin Schwidefsky (schwidefsky@de.ibm.com) |
| 12 | */ |
| 13 | |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/config.h> |
| 16 | #include <linux/init.h> |
| 17 | #include <linux/slab.h> |
| 18 | #include <linux/device.h> |
| 19 | #include <linux/kernel_stat.h> |
| 20 | #include <linux/interrupt.h> |
| 21 | |
| 22 | #include <asm/cio.h> |
| 23 | #include <asm/delay.h> |
| 24 | #include <asm/irq.h> |
| 25 | |
| 26 | #include "airq.h" |
| 27 | #include "cio.h" |
| 28 | #include "css.h" |
| 29 | #include "chsc.h" |
| 30 | #include "ioasm.h" |
| 31 | #include "blacklist.h" |
| 32 | #include "cio_debug.h" |
| 33 | |
| 34 | debug_info_t *cio_debug_msg_id; |
| 35 | debug_info_t *cio_debug_trace_id; |
| 36 | debug_info_t *cio_debug_crw_id; |
| 37 | |
| 38 | int cio_show_msg; |
| 39 | |
| 40 | static int __init |
| 41 | cio_setup (char *parm) |
| 42 | { |
| 43 | if (!strcmp (parm, "yes")) |
| 44 | cio_show_msg = 1; |
| 45 | else if (!strcmp (parm, "no")) |
| 46 | cio_show_msg = 0; |
| 47 | else |
| 48 | printk (KERN_ERR "cio_setup : invalid cio_msg parameter '%s'", |
| 49 | parm); |
| 50 | return 1; |
| 51 | } |
| 52 | |
| 53 | __setup ("cio_msg=", cio_setup); |
| 54 | |
| 55 | /* |
| 56 | * Function: cio_debug_init |
| 57 | * Initializes three debug logs (under /proc/s390dbf) for common I/O: |
| 58 | * - cio_msg logs the messages which are printk'ed when CONFIG_DEBUG_IO is on |
| 59 | * - cio_trace logs the calling of different functions |
| 60 | * - cio_crw logs the messages which are printk'ed when CONFIG_DEBUG_CRW is on |
| 61 | * debug levels depend on CONFIG_DEBUG_IO resp. CONFIG_DEBUG_CRW |
| 62 | */ |
| 63 | static int __init |
| 64 | cio_debug_init (void) |
| 65 | { |
| 66 | cio_debug_msg_id = debug_register ("cio_msg", 4, 4, 16*sizeof (long)); |
| 67 | if (!cio_debug_msg_id) |
| 68 | goto out_unregister; |
| 69 | debug_register_view (cio_debug_msg_id, &debug_sprintf_view); |
| 70 | debug_set_level (cio_debug_msg_id, 2); |
| 71 | cio_debug_trace_id = debug_register ("cio_trace", 4, 4, 8); |
| 72 | if (!cio_debug_trace_id) |
| 73 | goto out_unregister; |
| 74 | debug_register_view (cio_debug_trace_id, &debug_hex_ascii_view); |
| 75 | debug_set_level (cio_debug_trace_id, 2); |
| 76 | cio_debug_crw_id = debug_register ("cio_crw", 2, 4, 16*sizeof (long)); |
| 77 | if (!cio_debug_crw_id) |
| 78 | goto out_unregister; |
| 79 | debug_register_view (cio_debug_crw_id, &debug_sprintf_view); |
| 80 | debug_set_level (cio_debug_crw_id, 2); |
| 81 | pr_debug("debugging initialized\n"); |
| 82 | return 0; |
| 83 | |
| 84 | out_unregister: |
| 85 | if (cio_debug_msg_id) |
| 86 | debug_unregister (cio_debug_msg_id); |
| 87 | if (cio_debug_trace_id) |
| 88 | debug_unregister (cio_debug_trace_id); |
| 89 | if (cio_debug_crw_id) |
| 90 | debug_unregister (cio_debug_crw_id); |
| 91 | pr_debug("could not initialize debugging\n"); |
| 92 | return -1; |
| 93 | } |
| 94 | |
| 95 | arch_initcall (cio_debug_init); |
| 96 | |
| 97 | int |
| 98 | cio_set_options (struct subchannel *sch, int flags) |
| 99 | { |
| 100 | sch->options.suspend = (flags & DOIO_ALLOW_SUSPEND) != 0; |
| 101 | sch->options.prefetch = (flags & DOIO_DENY_PREFETCH) != 0; |
| 102 | sch->options.inter = (flags & DOIO_SUPPRESS_INTER) != 0; |
| 103 | return 0; |
| 104 | } |
| 105 | |
| 106 | /* FIXME: who wants to use this? */ |
| 107 | int |
| 108 | cio_get_options (struct subchannel *sch) |
| 109 | { |
| 110 | int flags; |
| 111 | |
| 112 | flags = 0; |
| 113 | if (sch->options.suspend) |
| 114 | flags |= DOIO_ALLOW_SUSPEND; |
| 115 | if (sch->options.prefetch) |
| 116 | flags |= DOIO_DENY_PREFETCH; |
| 117 | if (sch->options.inter) |
| 118 | flags |= DOIO_SUPPRESS_INTER; |
| 119 | return flags; |
| 120 | } |
| 121 | |
| 122 | /* |
| 123 | * Use tpi to get a pending interrupt, call the interrupt handler and |
| 124 | * return a pointer to the subchannel structure. |
| 125 | */ |
| 126 | static inline int |
| 127 | cio_tpi(void) |
| 128 | { |
| 129 | struct tpi_info *tpi_info; |
| 130 | struct subchannel *sch; |
| 131 | struct irb *irb; |
| 132 | |
| 133 | tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID; |
| 134 | if (tpi (NULL) != 1) |
| 135 | return 0; |
| 136 | irb = (struct irb *) __LC_IRB; |
| 137 | /* Store interrupt response block to lowcore. */ |
| 138 | if (tsch (tpi_info->irq, irb) != 0) |
| 139 | /* Not status pending or not operational. */ |
| 140 | return 1; |
| 141 | sch = (struct subchannel *)(unsigned long)tpi_info->intparm; |
| 142 | if (!sch) |
| 143 | return 1; |
| 144 | local_bh_disable(); |
| 145 | irq_enter (); |
| 146 | spin_lock(&sch->lock); |
| 147 | memcpy (&sch->schib.scsw, &irb->scsw, sizeof (struct scsw)); |
| 148 | if (sch->driver && sch->driver->irq) |
| 149 | sch->driver->irq(&sch->dev); |
| 150 | spin_unlock(&sch->lock); |
| 151 | irq_exit (); |
| 152 | __local_bh_enable(); |
| 153 | return 1; |
| 154 | } |
| 155 | |
| 156 | static inline int |
| 157 | cio_start_handle_notoper(struct subchannel *sch, __u8 lpm) |
| 158 | { |
| 159 | char dbf_text[15]; |
| 160 | |
| 161 | if (lpm != 0) |
| 162 | sch->lpm &= ~lpm; |
| 163 | else |
| 164 | sch->lpm = 0; |
| 165 | |
| 166 | stsch (sch->irq, &sch->schib); |
| 167 | |
| 168 | CIO_MSG_EVENT(0, "cio_start: 'not oper' status for " |
| 169 | "subchannel %04x!\n", sch->irq); |
| 170 | sprintf(dbf_text, "no%s", sch->dev.bus_id); |
| 171 | CIO_TRACE_EVENT(0, dbf_text); |
| 172 | CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib)); |
| 173 | |
| 174 | return (sch->lpm ? -EACCES : -ENODEV); |
| 175 | } |
| 176 | |
| 177 | int |
| 178 | cio_start_key (struct subchannel *sch, /* subchannel structure */ |
| 179 | struct ccw1 * cpa, /* logical channel prog addr */ |
| 180 | __u8 lpm, /* logical path mask */ |
| 181 | __u8 key) /* storage key */ |
| 182 | { |
| 183 | char dbf_txt[15]; |
| 184 | int ccode; |
| 185 | |
| 186 | CIO_TRACE_EVENT (4, "stIO"); |
| 187 | CIO_TRACE_EVENT (4, sch->dev.bus_id); |
| 188 | |
| 189 | /* sch is always under 2G. */ |
| 190 | sch->orb.intparm = (__u32)(unsigned long)sch; |
| 191 | sch->orb.fmt = 1; |
| 192 | |
| 193 | sch->orb.pfch = sch->options.prefetch == 0; |
| 194 | sch->orb.spnd = sch->options.suspend; |
| 195 | sch->orb.ssic = sch->options.suspend && sch->options.inter; |
| 196 | sch->orb.lpm = (lpm != 0) ? (lpm & sch->opm) : sch->lpm; |
| 197 | #ifdef CONFIG_ARCH_S390X |
| 198 | /* |
| 199 | * for 64 bit we always support 64 bit IDAWs with 4k page size only |
| 200 | */ |
| 201 | sch->orb.c64 = 1; |
| 202 | sch->orb.i2k = 0; |
| 203 | #endif |
| 204 | sch->orb.key = key >> 4; |
| 205 | /* issue "Start Subchannel" */ |
| 206 | sch->orb.cpa = (__u32) __pa (cpa); |
| 207 | ccode = ssch (sch->irq, &sch->orb); |
| 208 | |
| 209 | /* process condition code */ |
| 210 | sprintf (dbf_txt, "ccode:%d", ccode); |
| 211 | CIO_TRACE_EVENT (4, dbf_txt); |
| 212 | |
| 213 | switch (ccode) { |
| 214 | case 0: |
| 215 | /* |
| 216 | * initialize device status information |
| 217 | */ |
| 218 | sch->schib.scsw.actl |= SCSW_ACTL_START_PEND; |
| 219 | return 0; |
| 220 | case 1: /* status pending */ |
| 221 | case 2: /* busy */ |
| 222 | return -EBUSY; |
| 223 | default: /* device/path not operational */ |
| 224 | return cio_start_handle_notoper(sch, lpm); |
| 225 | } |
| 226 | } |
| 227 | |
| 228 | int |
| 229 | cio_start (struct subchannel *sch, struct ccw1 *cpa, __u8 lpm) |
| 230 | { |
Peter Oberparleiter | 0b642ed | 2005-05-01 08:58:58 -0700 | [diff] [blame^] | 231 | return cio_start_key(sch, cpa, lpm, PAGE_DEFAULT_KEY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | } |
| 233 | |
| 234 | /* |
| 235 | * resume suspended I/O operation |
| 236 | */ |
| 237 | int |
| 238 | cio_resume (struct subchannel *sch) |
| 239 | { |
| 240 | char dbf_txt[15]; |
| 241 | int ccode; |
| 242 | |
| 243 | CIO_TRACE_EVENT (4, "resIO"); |
| 244 | CIO_TRACE_EVENT (4, sch->dev.bus_id); |
| 245 | |
| 246 | ccode = rsch (sch->irq); |
| 247 | |
| 248 | sprintf (dbf_txt, "ccode:%d", ccode); |
| 249 | CIO_TRACE_EVENT (4, dbf_txt); |
| 250 | |
| 251 | switch (ccode) { |
| 252 | case 0: |
| 253 | sch->schib.scsw.actl |= SCSW_ACTL_RESUME_PEND; |
| 254 | return 0; |
| 255 | case 1: |
| 256 | return -EBUSY; |
| 257 | case 2: |
| 258 | return -EINVAL; |
| 259 | default: |
| 260 | /* |
| 261 | * useless to wait for request completion |
| 262 | * as device is no longer operational ! |
| 263 | */ |
| 264 | return -ENODEV; |
| 265 | } |
| 266 | } |
| 267 | |
| 268 | /* |
| 269 | * halt I/O operation |
| 270 | */ |
| 271 | int |
| 272 | cio_halt(struct subchannel *sch) |
| 273 | { |
| 274 | char dbf_txt[15]; |
| 275 | int ccode; |
| 276 | |
| 277 | if (!sch) |
| 278 | return -ENODEV; |
| 279 | |
| 280 | CIO_TRACE_EVENT (2, "haltIO"); |
| 281 | CIO_TRACE_EVENT (2, sch->dev.bus_id); |
| 282 | |
| 283 | /* |
| 284 | * Issue "Halt subchannel" and process condition code |
| 285 | */ |
| 286 | ccode = hsch (sch->irq); |
| 287 | |
| 288 | sprintf (dbf_txt, "ccode:%d", ccode); |
| 289 | CIO_TRACE_EVENT (2, dbf_txt); |
| 290 | |
| 291 | switch (ccode) { |
| 292 | case 0: |
| 293 | sch->schib.scsw.actl |= SCSW_ACTL_HALT_PEND; |
| 294 | return 0; |
| 295 | case 1: /* status pending */ |
| 296 | case 2: /* busy */ |
| 297 | return -EBUSY; |
| 298 | default: /* device not operational */ |
| 299 | return -ENODEV; |
| 300 | } |
| 301 | } |
| 302 | |
| 303 | /* |
| 304 | * Clear I/O operation |
| 305 | */ |
| 306 | int |
| 307 | cio_clear(struct subchannel *sch) |
| 308 | { |
| 309 | char dbf_txt[15]; |
| 310 | int ccode; |
| 311 | |
| 312 | if (!sch) |
| 313 | return -ENODEV; |
| 314 | |
| 315 | CIO_TRACE_EVENT (2, "clearIO"); |
| 316 | CIO_TRACE_EVENT (2, sch->dev.bus_id); |
| 317 | |
| 318 | /* |
| 319 | * Issue "Clear subchannel" and process condition code |
| 320 | */ |
| 321 | ccode = csch (sch->irq); |
| 322 | |
| 323 | sprintf (dbf_txt, "ccode:%d", ccode); |
| 324 | CIO_TRACE_EVENT (2, dbf_txt); |
| 325 | |
| 326 | switch (ccode) { |
| 327 | case 0: |
| 328 | sch->schib.scsw.actl |= SCSW_ACTL_CLEAR_PEND; |
| 329 | return 0; |
| 330 | default: /* device not operational */ |
| 331 | return -ENODEV; |
| 332 | } |
| 333 | } |
| 334 | |
| 335 | /* |
| 336 | * Function: cio_cancel |
| 337 | * Issues a "Cancel Subchannel" on the specified subchannel |
| 338 | * Note: We don't need any fancy intparms and flags here |
| 339 | * since xsch is executed synchronously. |
| 340 | * Only for common I/O internal use as for now. |
| 341 | */ |
| 342 | int |
| 343 | cio_cancel (struct subchannel *sch) |
| 344 | { |
| 345 | char dbf_txt[15]; |
| 346 | int ccode; |
| 347 | |
| 348 | if (!sch) |
| 349 | return -ENODEV; |
| 350 | |
| 351 | CIO_TRACE_EVENT (2, "cancelIO"); |
| 352 | CIO_TRACE_EVENT (2, sch->dev.bus_id); |
| 353 | |
| 354 | ccode = xsch (sch->irq); |
| 355 | |
| 356 | sprintf (dbf_txt, "ccode:%d", ccode); |
| 357 | CIO_TRACE_EVENT (2, dbf_txt); |
| 358 | |
| 359 | switch (ccode) { |
| 360 | case 0: /* success */ |
| 361 | /* Update information in scsw. */ |
| 362 | stsch (sch->irq, &sch->schib); |
| 363 | return 0; |
| 364 | case 1: /* status pending */ |
| 365 | return -EBUSY; |
| 366 | case 2: /* not applicable */ |
| 367 | return -EINVAL; |
| 368 | default: /* not oper */ |
| 369 | return -ENODEV; |
| 370 | } |
| 371 | } |
| 372 | |
| 373 | /* |
| 374 | * Function: cio_modify |
| 375 | * Issues a "Modify Subchannel" on the specified subchannel |
| 376 | */ |
| 377 | int |
| 378 | cio_modify (struct subchannel *sch) |
| 379 | { |
| 380 | int ccode, retry, ret; |
| 381 | |
| 382 | ret = 0; |
| 383 | for (retry = 0; retry < 5; retry++) { |
| 384 | ccode = msch_err (sch->irq, &sch->schib); |
| 385 | if (ccode < 0) /* -EIO if msch gets a program check. */ |
| 386 | return ccode; |
| 387 | switch (ccode) { |
| 388 | case 0: /* successfull */ |
| 389 | return 0; |
| 390 | case 1: /* status pending */ |
| 391 | return -EBUSY; |
| 392 | case 2: /* busy */ |
| 393 | udelay (100); /* allow for recovery */ |
| 394 | ret = -EBUSY; |
| 395 | break; |
| 396 | case 3: /* not operational */ |
| 397 | return -ENODEV; |
| 398 | } |
| 399 | } |
| 400 | return ret; |
| 401 | } |
| 402 | |
| 403 | /* |
| 404 | * Enable subchannel. |
| 405 | */ |
| 406 | int |
| 407 | cio_enable_subchannel (struct subchannel *sch, unsigned int isc) |
| 408 | { |
| 409 | char dbf_txt[15]; |
| 410 | int ccode; |
| 411 | int retry; |
| 412 | int ret; |
| 413 | |
| 414 | CIO_TRACE_EVENT (2, "ensch"); |
| 415 | CIO_TRACE_EVENT (2, sch->dev.bus_id); |
| 416 | |
| 417 | ccode = stsch (sch->irq, &sch->schib); |
| 418 | if (ccode) |
| 419 | return -ENODEV; |
| 420 | |
| 421 | for (retry = 5, ret = 0; retry > 0; retry--) { |
| 422 | sch->schib.pmcw.ena = 1; |
| 423 | sch->schib.pmcw.isc = isc; |
| 424 | sch->schib.pmcw.intparm = (__u32)(unsigned long)sch; |
| 425 | ret = cio_modify(sch); |
| 426 | if (ret == -ENODEV) |
| 427 | break; |
| 428 | if (ret == -EIO) |
| 429 | /* |
| 430 | * Got a program check in cio_modify. Try without |
| 431 | * the concurrent sense bit the next time. |
| 432 | */ |
| 433 | sch->schib.pmcw.csense = 0; |
| 434 | if (ret == 0) { |
| 435 | stsch (sch->irq, &sch->schib); |
| 436 | if (sch->schib.pmcw.ena) |
| 437 | break; |
| 438 | } |
| 439 | if (ret == -EBUSY) { |
| 440 | struct irb irb; |
| 441 | if (tsch(sch->irq, &irb) != 0) |
| 442 | break; |
| 443 | } |
| 444 | } |
| 445 | sprintf (dbf_txt, "ret:%d", ret); |
| 446 | CIO_TRACE_EVENT (2, dbf_txt); |
| 447 | return ret; |
| 448 | } |
| 449 | |
| 450 | /* |
| 451 | * Disable subchannel. |
| 452 | */ |
| 453 | int |
| 454 | cio_disable_subchannel (struct subchannel *sch) |
| 455 | { |
| 456 | char dbf_txt[15]; |
| 457 | int ccode; |
| 458 | int retry; |
| 459 | int ret; |
| 460 | |
| 461 | CIO_TRACE_EVENT (2, "dissch"); |
| 462 | CIO_TRACE_EVENT (2, sch->dev.bus_id); |
| 463 | |
| 464 | ccode = stsch (sch->irq, &sch->schib); |
| 465 | if (ccode == 3) /* Not operational. */ |
| 466 | return -ENODEV; |
| 467 | |
| 468 | if (sch->schib.scsw.actl != 0) |
| 469 | /* |
| 470 | * the disable function must not be called while there are |
| 471 | * requests pending for completion ! |
| 472 | */ |
| 473 | return -EBUSY; |
| 474 | |
| 475 | for (retry = 5, ret = 0; retry > 0; retry--) { |
| 476 | sch->schib.pmcw.ena = 0; |
| 477 | ret = cio_modify(sch); |
| 478 | if (ret == -ENODEV) |
| 479 | break; |
| 480 | if (ret == -EBUSY) |
| 481 | /* |
| 482 | * The subchannel is busy or status pending. |
| 483 | * We'll disable when the next interrupt was delivered |
| 484 | * via the state machine. |
| 485 | */ |
| 486 | break; |
| 487 | if (ret == 0) { |
| 488 | stsch (sch->irq, &sch->schib); |
| 489 | if (!sch->schib.pmcw.ena) |
| 490 | break; |
| 491 | } |
| 492 | } |
| 493 | sprintf (dbf_txt, "ret:%d", ret); |
| 494 | CIO_TRACE_EVENT (2, dbf_txt); |
| 495 | return ret; |
| 496 | } |
| 497 | |
| 498 | /* |
| 499 | * cio_validate_subchannel() |
| 500 | * |
| 501 | * Find out subchannel type and initialize struct subchannel. |
| 502 | * Return codes: |
| 503 | * SUBCHANNEL_TYPE_IO for a normal io subchannel |
| 504 | * SUBCHANNEL_TYPE_CHSC for a chsc subchannel |
| 505 | * SUBCHANNEL_TYPE_MESSAGE for a messaging subchannel |
| 506 | * SUBCHANNEL_TYPE_ADM for a adm(?) subchannel |
| 507 | * -ENXIO for non-defined subchannels |
| 508 | * -ENODEV for subchannels with invalid device number or blacklisted devices |
| 509 | */ |
| 510 | int |
| 511 | cio_validate_subchannel (struct subchannel *sch, unsigned int irq) |
| 512 | { |
| 513 | char dbf_txt[15]; |
| 514 | int ccode; |
| 515 | |
| 516 | sprintf (dbf_txt, "valsch%x", irq); |
| 517 | CIO_TRACE_EVENT (4, dbf_txt); |
| 518 | |
| 519 | /* Nuke all fields. */ |
| 520 | memset(sch, 0, sizeof(struct subchannel)); |
| 521 | |
| 522 | spin_lock_init(&sch->lock); |
| 523 | |
| 524 | /* Set a name for the subchannel */ |
| 525 | snprintf (sch->dev.bus_id, BUS_ID_SIZE, "0.0.%04x", irq); |
| 526 | |
| 527 | /* |
| 528 | * The first subchannel that is not-operational (ccode==3) |
| 529 | * indicates that there aren't any more devices available. |
| 530 | */ |
| 531 | sch->irq = irq; |
| 532 | ccode = stsch (irq, &sch->schib); |
| 533 | if (ccode) |
| 534 | return -ENXIO; |
| 535 | |
| 536 | /* Copy subchannel type from path management control word. */ |
| 537 | sch->st = sch->schib.pmcw.st; |
| 538 | |
| 539 | /* |
| 540 | * ... just being curious we check for non I/O subchannels |
| 541 | */ |
| 542 | if (sch->st != 0) { |
| 543 | CIO_DEBUG(KERN_INFO, 0, |
| 544 | "Subchannel %04X reports " |
| 545 | "non-I/O subchannel type %04X\n", |
| 546 | sch->irq, sch->st); |
| 547 | /* We stop here for non-io subchannels. */ |
| 548 | return sch->st; |
| 549 | } |
| 550 | |
| 551 | /* Initialization for io subchannels. */ |
| 552 | if (!sch->schib.pmcw.dnv) |
| 553 | /* io subchannel but device number is invalid. */ |
| 554 | return -ENODEV; |
| 555 | |
| 556 | /* Devno is valid. */ |
| 557 | if (is_blacklisted (sch->schib.pmcw.dev)) { |
| 558 | /* |
| 559 | * This device must not be known to Linux. So we simply |
| 560 | * say that there is no device and return ENODEV. |
| 561 | */ |
| 562 | CIO_MSG_EVENT(0, "Blacklisted device detected " |
| 563 | "at devno %04X\n", sch->schib.pmcw.dev); |
| 564 | return -ENODEV; |
| 565 | } |
| 566 | sch->opm = 0xff; |
| 567 | chsc_validate_chpids(sch); |
| 568 | sch->lpm = sch->schib.pmcw.pim & |
| 569 | sch->schib.pmcw.pam & |
| 570 | sch->schib.pmcw.pom & |
| 571 | sch->opm; |
| 572 | |
| 573 | CIO_DEBUG(KERN_INFO, 0, |
| 574 | "Detected device %04X on subchannel %04X" |
| 575 | " - PIM = %02X, PAM = %02X, POM = %02X\n", |
| 576 | sch->schib.pmcw.dev, sch->irq, sch->schib.pmcw.pim, |
| 577 | sch->schib.pmcw.pam, sch->schib.pmcw.pom); |
| 578 | |
| 579 | /* |
| 580 | * We now have to initially ... |
| 581 | * ... set "interruption subclass" |
| 582 | * ... enable "concurrent sense" |
| 583 | * ... enable "multipath mode" if more than one |
| 584 | * CHPID is available. This is done regardless |
| 585 | * whether multiple paths are available for us. |
| 586 | */ |
| 587 | sch->schib.pmcw.isc = 3; /* could be smth. else */ |
| 588 | sch->schib.pmcw.csense = 1; /* concurrent sense */ |
| 589 | sch->schib.pmcw.ena = 0; |
| 590 | if ((sch->lpm & (sch->lpm - 1)) != 0) |
| 591 | sch->schib.pmcw.mp = 1; /* multipath mode */ |
| 592 | return 0; |
| 593 | } |
| 594 | |
| 595 | /* |
| 596 | * do_IRQ() handles all normal I/O device IRQ's (the special |
| 597 | * SMP cross-CPU interrupts have their own specific |
| 598 | * handlers). |
| 599 | * |
| 600 | */ |
| 601 | void |
| 602 | do_IRQ (struct pt_regs *regs) |
| 603 | { |
| 604 | struct tpi_info *tpi_info; |
| 605 | struct subchannel *sch; |
| 606 | struct irb *irb; |
| 607 | |
| 608 | irq_enter (); |
| 609 | asm volatile ("mc 0,0"); |
| 610 | if (S390_lowcore.int_clock >= S390_lowcore.jiffy_timer) |
| 611 | /** |
| 612 | * Make sure that the i/o interrupt did not "overtake" |
| 613 | * the last HZ timer interrupt. |
| 614 | */ |
| 615 | account_ticks(regs); |
| 616 | /* |
| 617 | * Get interrupt information from lowcore |
| 618 | */ |
| 619 | tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID; |
| 620 | irb = (struct irb *) __LC_IRB; |
| 621 | do { |
| 622 | kstat_cpu(smp_processor_id()).irqs[IO_INTERRUPT]++; |
| 623 | /* |
| 624 | * Non I/O-subchannel thin interrupts are processed differently |
| 625 | */ |
| 626 | if (tpi_info->adapter_IO == 1 && |
| 627 | tpi_info->int_type == IO_INTERRUPT_TYPE) { |
| 628 | do_adapter_IO(); |
| 629 | continue; |
| 630 | } |
| 631 | sch = (struct subchannel *)(unsigned long)tpi_info->intparm; |
| 632 | if (sch) |
| 633 | spin_lock(&sch->lock); |
| 634 | /* Store interrupt response block to lowcore. */ |
| 635 | if (tsch (tpi_info->irq, irb) == 0 && sch) { |
| 636 | /* Keep subchannel information word up to date. */ |
| 637 | memcpy (&sch->schib.scsw, &irb->scsw, |
| 638 | sizeof (irb->scsw)); |
| 639 | /* Call interrupt handler if there is one. */ |
| 640 | if (sch->driver && sch->driver->irq) |
| 641 | sch->driver->irq(&sch->dev); |
| 642 | } |
| 643 | if (sch) |
| 644 | spin_unlock(&sch->lock); |
| 645 | /* |
| 646 | * Are more interrupts pending? |
| 647 | * If so, the tpi instruction will update the lowcore |
| 648 | * to hold the info for the next interrupt. |
| 649 | * We don't do this for VM because a tpi drops the cpu |
| 650 | * out of the sie which costs more cycles than it saves. |
| 651 | */ |
| 652 | } while (!MACHINE_IS_VM && tpi (NULL) != 0); |
| 653 | irq_exit (); |
| 654 | } |
| 655 | |
| 656 | #ifdef CONFIG_CCW_CONSOLE |
| 657 | static struct subchannel console_subchannel; |
| 658 | static int console_subchannel_in_use; |
| 659 | |
| 660 | /* |
| 661 | * busy wait for the next interrupt on the console |
| 662 | */ |
| 663 | void |
| 664 | wait_cons_dev (void) |
| 665 | { |
| 666 | unsigned long cr6 __attribute__ ((aligned (8))); |
| 667 | unsigned long save_cr6 __attribute__ ((aligned (8))); |
| 668 | |
| 669 | /* |
| 670 | * before entering the spinlock we may already have |
| 671 | * processed the interrupt on a different CPU... |
| 672 | */ |
| 673 | if (!console_subchannel_in_use) |
| 674 | return; |
| 675 | |
| 676 | /* disable all but isc 7 (console device) */ |
| 677 | __ctl_store (save_cr6, 6, 6); |
| 678 | cr6 = 0x01000000; |
| 679 | __ctl_load (cr6, 6, 6); |
| 680 | |
| 681 | do { |
| 682 | spin_unlock(&console_subchannel.lock); |
| 683 | if (!cio_tpi()) |
| 684 | cpu_relax(); |
| 685 | spin_lock(&console_subchannel.lock); |
| 686 | } while (console_subchannel.schib.scsw.actl != 0); |
| 687 | /* |
| 688 | * restore previous isc value |
| 689 | */ |
| 690 | __ctl_load (save_cr6, 6, 6); |
| 691 | } |
| 692 | |
| 693 | static int |
| 694 | cio_console_irq(void) |
| 695 | { |
| 696 | int irq; |
| 697 | |
| 698 | if (console_irq != -1) { |
| 699 | /* VM provided us with the irq number of the console. */ |
| 700 | if (stsch(console_irq, &console_subchannel.schib) != 0 || |
| 701 | !console_subchannel.schib.pmcw.dnv) |
| 702 | return -1; |
| 703 | console_devno = console_subchannel.schib.pmcw.dev; |
| 704 | } else if (console_devno != -1) { |
| 705 | /* At least the console device number is known. */ |
| 706 | for (irq = 0; irq < __MAX_SUBCHANNELS; irq++) { |
| 707 | if (stsch(irq, &console_subchannel.schib) != 0) |
| 708 | break; |
| 709 | if (console_subchannel.schib.pmcw.dnv && |
| 710 | console_subchannel.schib.pmcw.dev == |
| 711 | console_devno) { |
| 712 | console_irq = irq; |
| 713 | break; |
| 714 | } |
| 715 | } |
| 716 | if (console_irq == -1) |
| 717 | return -1; |
| 718 | } else { |
| 719 | /* unlike in 2.4, we cannot autoprobe here, since |
| 720 | * the channel subsystem is not fully initialized. |
| 721 | * With some luck, the HWC console can take over */ |
| 722 | printk(KERN_WARNING "No ccw console found!\n"); |
| 723 | return -1; |
| 724 | } |
| 725 | return console_irq; |
| 726 | } |
| 727 | |
| 728 | struct subchannel * |
| 729 | cio_probe_console(void) |
| 730 | { |
| 731 | int irq, ret; |
| 732 | |
| 733 | if (xchg(&console_subchannel_in_use, 1) != 0) |
| 734 | return ERR_PTR(-EBUSY); |
| 735 | irq = cio_console_irq(); |
| 736 | if (irq == -1) { |
| 737 | console_subchannel_in_use = 0; |
| 738 | return ERR_PTR(-ENODEV); |
| 739 | } |
| 740 | memset(&console_subchannel, 0, sizeof(struct subchannel)); |
| 741 | ret = cio_validate_subchannel(&console_subchannel, irq); |
| 742 | if (ret) { |
| 743 | console_subchannel_in_use = 0; |
| 744 | return ERR_PTR(-ENODEV); |
| 745 | } |
| 746 | |
| 747 | /* |
| 748 | * enable console I/O-interrupt subclass 7 |
| 749 | */ |
| 750 | ctl_set_bit(6, 24); |
| 751 | console_subchannel.schib.pmcw.isc = 7; |
| 752 | console_subchannel.schib.pmcw.intparm = |
| 753 | (__u32)(unsigned long)&console_subchannel; |
| 754 | ret = cio_modify(&console_subchannel); |
| 755 | if (ret) { |
| 756 | console_subchannel_in_use = 0; |
| 757 | return ERR_PTR(ret); |
| 758 | } |
| 759 | return &console_subchannel; |
| 760 | } |
| 761 | |
| 762 | void |
| 763 | cio_release_console(void) |
| 764 | { |
| 765 | console_subchannel.schib.pmcw.intparm = 0; |
| 766 | cio_modify(&console_subchannel); |
| 767 | ctl_clear_bit(6, 24); |
| 768 | console_subchannel_in_use = 0; |
| 769 | } |
| 770 | |
| 771 | /* Bah... hack to catch console special sausages. */ |
| 772 | int |
| 773 | cio_is_console(int irq) |
| 774 | { |
| 775 | if (!console_subchannel_in_use) |
| 776 | return 0; |
| 777 | return (irq == console_subchannel.irq); |
| 778 | } |
| 779 | |
| 780 | struct subchannel * |
| 781 | cio_get_console_subchannel(void) |
| 782 | { |
| 783 | if (!console_subchannel_in_use) |
| 784 | return 0; |
| 785 | return &console_subchannel; |
| 786 | } |
| 787 | |
| 788 | #endif |
| 789 | static inline int |
| 790 | __disable_subchannel_easy(unsigned int schid, struct schib *schib) |
| 791 | { |
| 792 | int retry, cc; |
| 793 | |
| 794 | cc = 0; |
| 795 | for (retry=0;retry<3;retry++) { |
| 796 | schib->pmcw.ena = 0; |
| 797 | cc = msch(schid, schib); |
| 798 | if (cc) |
| 799 | return (cc==3?-ENODEV:-EBUSY); |
| 800 | stsch(schid, schib); |
| 801 | if (!schib->pmcw.ena) |
| 802 | return 0; |
| 803 | } |
| 804 | return -EBUSY; /* uhm... */ |
| 805 | } |
| 806 | |
| 807 | static inline int |
| 808 | __clear_subchannel_easy(unsigned int schid) |
| 809 | { |
| 810 | int retry; |
| 811 | |
| 812 | if (csch(schid)) |
| 813 | return -ENODEV; |
| 814 | for (retry=0;retry<20;retry++) { |
| 815 | struct tpi_info ti; |
| 816 | |
| 817 | if (tpi(&ti)) { |
| 818 | tsch(schid, (struct irb *)__LC_IRB); |
| 819 | return 0; |
| 820 | } |
| 821 | udelay(100); |
| 822 | } |
| 823 | return -EBUSY; |
| 824 | } |
| 825 | |
| 826 | extern void do_reipl(unsigned long devno); |
| 827 | |
| 828 | /* Clear all subchannels. */ |
| 829 | void |
| 830 | clear_all_subchannels(void) |
| 831 | { |
| 832 | unsigned int schid; |
| 833 | |
| 834 | local_irq_disable(); |
| 835 | for (schid=0;schid<=highest_subchannel;schid++) { |
| 836 | struct schib schib; |
| 837 | if (stsch(schid, &schib)) |
| 838 | break; /* break out of the loop */ |
| 839 | if (!schib.pmcw.ena) |
| 840 | continue; |
| 841 | switch(__disable_subchannel_easy(schid, &schib)) { |
| 842 | case 0: |
| 843 | case -ENODEV: |
| 844 | break; |
| 845 | default: /* -EBUSY */ |
| 846 | if (__clear_subchannel_easy(schid)) |
| 847 | break; /* give up... jump out of switch */ |
| 848 | stsch(schid, &schib); |
| 849 | __disable_subchannel_easy(schid, &schib); |
| 850 | } |
| 851 | } |
| 852 | } |
| 853 | |
| 854 | /* Make sure all subchannels are quiet before we re-ipl an lpar. */ |
| 855 | void |
| 856 | reipl(unsigned long devno) |
| 857 | { |
| 858 | clear_all_subchannels(); |
| 859 | do_reipl(devno); |
| 860 | } |