| 1 | /* |
| 2 | * S/390 common I/O routines -- low level i/o calls |
| 3 | * |
| 4 | * Copyright IBM Corp. 1999, 2008 |
| 5 | * Author(s): Ingo Adlung (adlung@de.ibm.com) |
| 6 | * Cornelia Huck (cornelia.huck@de.ibm.com) |
| 7 | * Arnd Bergmann (arndb@de.ibm.com) |
| 8 | * Martin Schwidefsky (schwidefsky@de.ibm.com) |
| 9 | */ |
| 10 | |
| 11 | #define KMSG_COMPONENT "cio" |
| 12 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| 13 | |
| 14 | #include <linux/ftrace.h> |
| 15 | #include <linux/module.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 | #include <asm/cio.h> |
| 22 | #include <asm/delay.h> |
| 23 | #include <asm/irq.h> |
| 24 | #include <asm/irq_regs.h> |
| 25 | #include <asm/setup.h> |
| 26 | #include <asm/reset.h> |
| 27 | #include <asm/ipl.h> |
| 28 | #include <asm/chpid.h> |
| 29 | #include <asm/airq.h> |
| 30 | #include <asm/isc.h> |
| 31 | #include <asm/cputime.h> |
| 32 | #include <asm/fcx.h> |
| 33 | #include <asm/nmi.h> |
| 34 | #include <asm/crw.h> |
| 35 | #include "cio.h" |
| 36 | #include "css.h" |
| 37 | #include "chsc.h" |
| 38 | #include "ioasm.h" |
| 39 | #include "io_sch.h" |
| 40 | #include "blacklist.h" |
| 41 | #include "cio_debug.h" |
| 42 | #include "chp.h" |
| 43 | |
| 44 | debug_info_t *cio_debug_msg_id; |
| 45 | debug_info_t *cio_debug_trace_id; |
| 46 | debug_info_t *cio_debug_crw_id; |
| 47 | |
| 48 | /* |
| 49 | * Function: cio_debug_init |
| 50 | * Initializes three debug logs for common I/O: |
| 51 | * - cio_msg logs generic cio messages |
| 52 | * - cio_trace logs the calling of different functions |
| 53 | * - cio_crw logs machine check related cio messages |
| 54 | */ |
| 55 | static int __init cio_debug_init(void) |
| 56 | { |
| 57 | cio_debug_msg_id = debug_register("cio_msg", 16, 1, 16 * sizeof(long)); |
| 58 | if (!cio_debug_msg_id) |
| 59 | goto out_unregister; |
| 60 | debug_register_view(cio_debug_msg_id, &debug_sprintf_view); |
| 61 | debug_set_level(cio_debug_msg_id, 2); |
| 62 | cio_debug_trace_id = debug_register("cio_trace", 16, 1, 16); |
| 63 | if (!cio_debug_trace_id) |
| 64 | goto out_unregister; |
| 65 | debug_register_view(cio_debug_trace_id, &debug_hex_ascii_view); |
| 66 | debug_set_level(cio_debug_trace_id, 2); |
| 67 | cio_debug_crw_id = debug_register("cio_crw", 16, 1, 16 * sizeof(long)); |
| 68 | if (!cio_debug_crw_id) |
| 69 | goto out_unregister; |
| 70 | debug_register_view(cio_debug_crw_id, &debug_sprintf_view); |
| 71 | debug_set_level(cio_debug_crw_id, 4); |
| 72 | return 0; |
| 73 | |
| 74 | out_unregister: |
| 75 | if (cio_debug_msg_id) |
| 76 | debug_unregister(cio_debug_msg_id); |
| 77 | if (cio_debug_trace_id) |
| 78 | debug_unregister(cio_debug_trace_id); |
| 79 | if (cio_debug_crw_id) |
| 80 | debug_unregister(cio_debug_crw_id); |
| 81 | return -1; |
| 82 | } |
| 83 | |
| 84 | arch_initcall (cio_debug_init); |
| 85 | |
| 86 | int cio_set_options(struct subchannel *sch, int flags) |
| 87 | { |
| 88 | struct io_subchannel_private *priv = to_io_private(sch); |
| 89 | |
| 90 | priv->options.suspend = (flags & DOIO_ALLOW_SUSPEND) != 0; |
| 91 | priv->options.prefetch = (flags & DOIO_DENY_PREFETCH) != 0; |
| 92 | priv->options.inter = (flags & DOIO_SUPPRESS_INTER) != 0; |
| 93 | return 0; |
| 94 | } |
| 95 | |
| 96 | static int |
| 97 | cio_start_handle_notoper(struct subchannel *sch, __u8 lpm) |
| 98 | { |
| 99 | char dbf_text[15]; |
| 100 | |
| 101 | if (lpm != 0) |
| 102 | sch->lpm &= ~lpm; |
| 103 | else |
| 104 | sch->lpm = 0; |
| 105 | |
| 106 | CIO_MSG_EVENT(2, "cio_start: 'not oper' status for " |
| 107 | "subchannel 0.%x.%04x!\n", sch->schid.ssid, |
| 108 | sch->schid.sch_no); |
| 109 | |
| 110 | if (cio_update_schib(sch)) |
| 111 | return -ENODEV; |
| 112 | |
| 113 | sprintf(dbf_text, "no%s", dev_name(&sch->dev)); |
| 114 | CIO_TRACE_EVENT(0, dbf_text); |
| 115 | CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib)); |
| 116 | |
| 117 | return (sch->lpm ? -EACCES : -ENODEV); |
| 118 | } |
| 119 | |
| 120 | int |
| 121 | cio_start_key (struct subchannel *sch, /* subchannel structure */ |
| 122 | struct ccw1 * cpa, /* logical channel prog addr */ |
| 123 | __u8 lpm, /* logical path mask */ |
| 124 | __u8 key) /* storage key */ |
| 125 | { |
| 126 | struct io_subchannel_private *priv = to_io_private(sch); |
| 127 | union orb *orb = &priv->orb; |
| 128 | int ccode; |
| 129 | |
| 130 | CIO_TRACE_EVENT(5, "stIO"); |
| 131 | CIO_TRACE_EVENT(5, dev_name(&sch->dev)); |
| 132 | |
| 133 | memset(orb, 0, sizeof(union orb)); |
| 134 | /* sch is always under 2G. */ |
| 135 | orb->cmd.intparm = (u32)(addr_t)sch; |
| 136 | orb->cmd.fmt = 1; |
| 137 | |
| 138 | orb->cmd.pfch = priv->options.prefetch == 0; |
| 139 | orb->cmd.spnd = priv->options.suspend; |
| 140 | orb->cmd.ssic = priv->options.suspend && priv->options.inter; |
| 141 | orb->cmd.lpm = (lpm != 0) ? lpm : sch->lpm; |
| 142 | #ifdef CONFIG_64BIT |
| 143 | /* |
| 144 | * for 64 bit we always support 64 bit IDAWs with 4k page size only |
| 145 | */ |
| 146 | orb->cmd.c64 = 1; |
| 147 | orb->cmd.i2k = 0; |
| 148 | #endif |
| 149 | orb->cmd.key = key >> 4; |
| 150 | /* issue "Start Subchannel" */ |
| 151 | orb->cmd.cpa = (__u32) __pa(cpa); |
| 152 | ccode = ssch(sch->schid, orb); |
| 153 | |
| 154 | /* process condition code */ |
| 155 | CIO_HEX_EVENT(5, &ccode, sizeof(ccode)); |
| 156 | |
| 157 | switch (ccode) { |
| 158 | case 0: |
| 159 | /* |
| 160 | * initialize device status information |
| 161 | */ |
| 162 | sch->schib.scsw.cmd.actl |= SCSW_ACTL_START_PEND; |
| 163 | return 0; |
| 164 | case 1: /* status pending */ |
| 165 | case 2: /* busy */ |
| 166 | return -EBUSY; |
| 167 | case 3: /* device/path not operational */ |
| 168 | return cio_start_handle_notoper(sch, lpm); |
| 169 | default: |
| 170 | return ccode; |
| 171 | } |
| 172 | } |
| 173 | |
| 174 | int |
| 175 | cio_start (struct subchannel *sch, struct ccw1 *cpa, __u8 lpm) |
| 176 | { |
| 177 | return cio_start_key(sch, cpa, lpm, PAGE_DEFAULT_KEY); |
| 178 | } |
| 179 | |
| 180 | /* |
| 181 | * resume suspended I/O operation |
| 182 | */ |
| 183 | int |
| 184 | cio_resume (struct subchannel *sch) |
| 185 | { |
| 186 | int ccode; |
| 187 | |
| 188 | CIO_TRACE_EVENT(4, "resIO"); |
| 189 | CIO_TRACE_EVENT(4, dev_name(&sch->dev)); |
| 190 | |
| 191 | ccode = rsch (sch->schid); |
| 192 | |
| 193 | CIO_HEX_EVENT(4, &ccode, sizeof(ccode)); |
| 194 | |
| 195 | switch (ccode) { |
| 196 | case 0: |
| 197 | sch->schib.scsw.cmd.actl |= SCSW_ACTL_RESUME_PEND; |
| 198 | return 0; |
| 199 | case 1: |
| 200 | return -EBUSY; |
| 201 | case 2: |
| 202 | return -EINVAL; |
| 203 | default: |
| 204 | /* |
| 205 | * useless to wait for request completion |
| 206 | * as device is no longer operational ! |
| 207 | */ |
| 208 | return -ENODEV; |
| 209 | } |
| 210 | } |
| 211 | |
| 212 | /* |
| 213 | * halt I/O operation |
| 214 | */ |
| 215 | int |
| 216 | cio_halt(struct subchannel *sch) |
| 217 | { |
| 218 | int ccode; |
| 219 | |
| 220 | if (!sch) |
| 221 | return -ENODEV; |
| 222 | |
| 223 | CIO_TRACE_EVENT(2, "haltIO"); |
| 224 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
| 225 | |
| 226 | /* |
| 227 | * Issue "Halt subchannel" and process condition code |
| 228 | */ |
| 229 | ccode = hsch (sch->schid); |
| 230 | |
| 231 | CIO_HEX_EVENT(2, &ccode, sizeof(ccode)); |
| 232 | |
| 233 | switch (ccode) { |
| 234 | case 0: |
| 235 | sch->schib.scsw.cmd.actl |= SCSW_ACTL_HALT_PEND; |
| 236 | return 0; |
| 237 | case 1: /* status pending */ |
| 238 | case 2: /* busy */ |
| 239 | return -EBUSY; |
| 240 | default: /* device not operational */ |
| 241 | return -ENODEV; |
| 242 | } |
| 243 | } |
| 244 | |
| 245 | /* |
| 246 | * Clear I/O operation |
| 247 | */ |
| 248 | int |
| 249 | cio_clear(struct subchannel *sch) |
| 250 | { |
| 251 | int ccode; |
| 252 | |
| 253 | if (!sch) |
| 254 | return -ENODEV; |
| 255 | |
| 256 | CIO_TRACE_EVENT(2, "clearIO"); |
| 257 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
| 258 | |
| 259 | /* |
| 260 | * Issue "Clear subchannel" and process condition code |
| 261 | */ |
| 262 | ccode = csch (sch->schid); |
| 263 | |
| 264 | CIO_HEX_EVENT(2, &ccode, sizeof(ccode)); |
| 265 | |
| 266 | switch (ccode) { |
| 267 | case 0: |
| 268 | sch->schib.scsw.cmd.actl |= SCSW_ACTL_CLEAR_PEND; |
| 269 | return 0; |
| 270 | default: /* device not operational */ |
| 271 | return -ENODEV; |
| 272 | } |
| 273 | } |
| 274 | |
| 275 | /* |
| 276 | * Function: cio_cancel |
| 277 | * Issues a "Cancel Subchannel" on the specified subchannel |
| 278 | * Note: We don't need any fancy intparms and flags here |
| 279 | * since xsch is executed synchronously. |
| 280 | * Only for common I/O internal use as for now. |
| 281 | */ |
| 282 | int |
| 283 | cio_cancel (struct subchannel *sch) |
| 284 | { |
| 285 | int ccode; |
| 286 | |
| 287 | if (!sch) |
| 288 | return -ENODEV; |
| 289 | |
| 290 | CIO_TRACE_EVENT(2, "cancelIO"); |
| 291 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
| 292 | |
| 293 | ccode = xsch (sch->schid); |
| 294 | |
| 295 | CIO_HEX_EVENT(2, &ccode, sizeof(ccode)); |
| 296 | |
| 297 | switch (ccode) { |
| 298 | case 0: /* success */ |
| 299 | /* Update information in scsw. */ |
| 300 | if (cio_update_schib(sch)) |
| 301 | return -ENODEV; |
| 302 | return 0; |
| 303 | case 1: /* status pending */ |
| 304 | return -EBUSY; |
| 305 | case 2: /* not applicable */ |
| 306 | return -EINVAL; |
| 307 | default: /* not oper */ |
| 308 | return -ENODEV; |
| 309 | } |
| 310 | } |
| 311 | |
| 312 | |
| 313 | static void cio_apply_config(struct subchannel *sch, struct schib *schib) |
| 314 | { |
| 315 | schib->pmcw.intparm = sch->config.intparm; |
| 316 | schib->pmcw.mbi = sch->config.mbi; |
| 317 | schib->pmcw.isc = sch->config.isc; |
| 318 | schib->pmcw.ena = sch->config.ena; |
| 319 | schib->pmcw.mme = sch->config.mme; |
| 320 | schib->pmcw.mp = sch->config.mp; |
| 321 | schib->pmcw.csense = sch->config.csense; |
| 322 | schib->pmcw.mbfc = sch->config.mbfc; |
| 323 | if (sch->config.mbfc) |
| 324 | schib->mba = sch->config.mba; |
| 325 | } |
| 326 | |
| 327 | static int cio_check_config(struct subchannel *sch, struct schib *schib) |
| 328 | { |
| 329 | return (schib->pmcw.intparm == sch->config.intparm) && |
| 330 | (schib->pmcw.mbi == sch->config.mbi) && |
| 331 | (schib->pmcw.isc == sch->config.isc) && |
| 332 | (schib->pmcw.ena == sch->config.ena) && |
| 333 | (schib->pmcw.mme == sch->config.mme) && |
| 334 | (schib->pmcw.mp == sch->config.mp) && |
| 335 | (schib->pmcw.csense == sch->config.csense) && |
| 336 | (schib->pmcw.mbfc == sch->config.mbfc) && |
| 337 | (!sch->config.mbfc || (schib->mba == sch->config.mba)); |
| 338 | } |
| 339 | |
| 340 | /* |
| 341 | * cio_commit_config - apply configuration to the subchannel |
| 342 | */ |
| 343 | int cio_commit_config(struct subchannel *sch) |
| 344 | { |
| 345 | struct schib schib; |
| 346 | int ccode, retry, ret = 0; |
| 347 | |
| 348 | if (stsch_err(sch->schid, &schib) || !css_sch_is_valid(&schib)) |
| 349 | return -ENODEV; |
| 350 | |
| 351 | for (retry = 0; retry < 5; retry++) { |
| 352 | /* copy desired changes to local schib */ |
| 353 | cio_apply_config(sch, &schib); |
| 354 | ccode = msch_err(sch->schid, &schib); |
| 355 | if (ccode < 0) /* -EIO if msch gets a program check. */ |
| 356 | return ccode; |
| 357 | switch (ccode) { |
| 358 | case 0: /* successful */ |
| 359 | if (stsch_err(sch->schid, &schib) || |
| 360 | !css_sch_is_valid(&schib)) |
| 361 | return -ENODEV; |
| 362 | if (cio_check_config(sch, &schib)) { |
| 363 | /* commit changes from local schib */ |
| 364 | memcpy(&sch->schib, &schib, sizeof(schib)); |
| 365 | return 0; |
| 366 | } |
| 367 | ret = -EAGAIN; |
| 368 | break; |
| 369 | case 1: /* status pending */ |
| 370 | return -EBUSY; |
| 371 | case 2: /* busy */ |
| 372 | udelay(100); /* allow for recovery */ |
| 373 | ret = -EBUSY; |
| 374 | break; |
| 375 | case 3: /* not operational */ |
| 376 | return -ENODEV; |
| 377 | } |
| 378 | } |
| 379 | return ret; |
| 380 | } |
| 381 | |
| 382 | /** |
| 383 | * cio_update_schib - Perform stsch and update schib if subchannel is valid. |
| 384 | * @sch: subchannel on which to perform stsch |
| 385 | * Return zero on success, -ENODEV otherwise. |
| 386 | */ |
| 387 | int cio_update_schib(struct subchannel *sch) |
| 388 | { |
| 389 | struct schib schib; |
| 390 | |
| 391 | if (stsch_err(sch->schid, &schib) || !css_sch_is_valid(&schib)) |
| 392 | return -ENODEV; |
| 393 | |
| 394 | memcpy(&sch->schib, &schib, sizeof(schib)); |
| 395 | return 0; |
| 396 | } |
| 397 | EXPORT_SYMBOL_GPL(cio_update_schib); |
| 398 | |
| 399 | /** |
| 400 | * cio_enable_subchannel - enable a subchannel. |
| 401 | * @sch: subchannel to be enabled |
| 402 | * @intparm: interruption parameter to set |
| 403 | */ |
| 404 | int cio_enable_subchannel(struct subchannel *sch, u32 intparm) |
| 405 | { |
| 406 | int retry; |
| 407 | int ret; |
| 408 | |
| 409 | CIO_TRACE_EVENT(2, "ensch"); |
| 410 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
| 411 | |
| 412 | if (sch_is_pseudo_sch(sch)) |
| 413 | return -EINVAL; |
| 414 | if (cio_update_schib(sch)) |
| 415 | return -ENODEV; |
| 416 | |
| 417 | sch->config.ena = 1; |
| 418 | sch->config.isc = sch->isc; |
| 419 | sch->config.intparm = intparm; |
| 420 | |
| 421 | for (retry = 0; retry < 3; retry++) { |
| 422 | ret = cio_commit_config(sch); |
| 423 | if (ret == -EIO) { |
| 424 | /* |
| 425 | * Got a program check in msch. Try without |
| 426 | * the concurrent sense bit the next time. |
| 427 | */ |
| 428 | sch->config.csense = 0; |
| 429 | } else if (ret == -EBUSY) { |
| 430 | struct irb irb; |
| 431 | if (tsch(sch->schid, &irb) != 0) |
| 432 | break; |
| 433 | } else |
| 434 | break; |
| 435 | } |
| 436 | CIO_HEX_EVENT(2, &ret, sizeof(ret)); |
| 437 | return ret; |
| 438 | } |
| 439 | EXPORT_SYMBOL_GPL(cio_enable_subchannel); |
| 440 | |
| 441 | /** |
| 442 | * cio_disable_subchannel - disable a subchannel. |
| 443 | * @sch: subchannel to disable |
| 444 | */ |
| 445 | int cio_disable_subchannel(struct subchannel *sch) |
| 446 | { |
| 447 | int retry; |
| 448 | int ret; |
| 449 | |
| 450 | CIO_TRACE_EVENT(2, "dissch"); |
| 451 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
| 452 | |
| 453 | if (sch_is_pseudo_sch(sch)) |
| 454 | return 0; |
| 455 | if (cio_update_schib(sch)) |
| 456 | return -ENODEV; |
| 457 | |
| 458 | sch->config.ena = 0; |
| 459 | |
| 460 | for (retry = 0; retry < 3; retry++) { |
| 461 | ret = cio_commit_config(sch); |
| 462 | if (ret == -EBUSY) { |
| 463 | struct irb irb; |
| 464 | if (tsch(sch->schid, &irb) != 0) |
| 465 | break; |
| 466 | } else |
| 467 | break; |
| 468 | } |
| 469 | CIO_HEX_EVENT(2, &ret, sizeof(ret)); |
| 470 | return ret; |
| 471 | } |
| 472 | EXPORT_SYMBOL_GPL(cio_disable_subchannel); |
| 473 | |
| 474 | static int cio_check_devno_blacklisted(struct subchannel *sch) |
| 475 | { |
| 476 | if (is_blacklisted(sch->schid.ssid, sch->schib.pmcw.dev)) { |
| 477 | /* |
| 478 | * This device must not be known to Linux. So we simply |
| 479 | * say that there is no device and return ENODEV. |
| 480 | */ |
| 481 | CIO_MSG_EVENT(6, "Blacklisted device detected " |
| 482 | "at devno %04X, subchannel set %x\n", |
| 483 | sch->schib.pmcw.dev, sch->schid.ssid); |
| 484 | return -ENODEV; |
| 485 | } |
| 486 | return 0; |
| 487 | } |
| 488 | |
| 489 | static int cio_validate_io_subchannel(struct subchannel *sch) |
| 490 | { |
| 491 | /* Initialization for io subchannels. */ |
| 492 | if (!css_sch_is_valid(&sch->schib)) |
| 493 | return -ENODEV; |
| 494 | |
| 495 | /* Devno is valid. */ |
| 496 | return cio_check_devno_blacklisted(sch); |
| 497 | } |
| 498 | |
| 499 | static int cio_validate_msg_subchannel(struct subchannel *sch) |
| 500 | { |
| 501 | /* Initialization for message subchannels. */ |
| 502 | if (!css_sch_is_valid(&sch->schib)) |
| 503 | return -ENODEV; |
| 504 | |
| 505 | /* Devno is valid. */ |
| 506 | return cio_check_devno_blacklisted(sch); |
| 507 | } |
| 508 | |
| 509 | /** |
| 510 | * cio_validate_subchannel - basic validation of subchannel |
| 511 | * @sch: subchannel structure to be filled out |
| 512 | * @schid: subchannel id |
| 513 | * |
| 514 | * Find out subchannel type and initialize struct subchannel. |
| 515 | * Return codes: |
| 516 | * 0 on success |
| 517 | * -ENXIO for non-defined subchannels |
| 518 | * -ENODEV for invalid subchannels or blacklisted devices |
| 519 | * -EIO for subchannels in an invalid subchannel set |
| 520 | */ |
| 521 | int cio_validate_subchannel(struct subchannel *sch, struct subchannel_id schid) |
| 522 | { |
| 523 | char dbf_txt[15]; |
| 524 | int ccode; |
| 525 | int err; |
| 526 | |
| 527 | sprintf(dbf_txt, "valsch%x", schid.sch_no); |
| 528 | CIO_TRACE_EVENT(4, dbf_txt); |
| 529 | |
| 530 | /* |
| 531 | * The first subchannel that is not-operational (ccode==3) |
| 532 | * indicates that there aren't any more devices available. |
| 533 | * If stsch gets an exception, it means the current subchannel set |
| 534 | * is not valid. |
| 535 | */ |
| 536 | ccode = stsch_err(schid, &sch->schib); |
| 537 | if (ccode) { |
| 538 | err = (ccode == 3) ? -ENXIO : ccode; |
| 539 | goto out; |
| 540 | } |
| 541 | sch->st = sch->schib.pmcw.st; |
| 542 | sch->schid = schid; |
| 543 | |
| 544 | switch (sch->st) { |
| 545 | case SUBCHANNEL_TYPE_IO: |
| 546 | err = cio_validate_io_subchannel(sch); |
| 547 | break; |
| 548 | case SUBCHANNEL_TYPE_MSG: |
| 549 | err = cio_validate_msg_subchannel(sch); |
| 550 | break; |
| 551 | default: |
| 552 | err = 0; |
| 553 | } |
| 554 | if (err) |
| 555 | goto out; |
| 556 | |
| 557 | CIO_MSG_EVENT(4, "Subchannel 0.%x.%04x reports subchannel type %04X\n", |
| 558 | sch->schid.ssid, sch->schid.sch_no, sch->st); |
| 559 | out: |
| 560 | return err; |
| 561 | } |
| 562 | |
| 563 | /* |
| 564 | * do_IRQ() handles all normal I/O device IRQ's (the special |
| 565 | * SMP cross-CPU interrupts have their own specific |
| 566 | * handlers). |
| 567 | * |
| 568 | */ |
| 569 | void __irq_entry do_IRQ(struct pt_regs *regs) |
| 570 | { |
| 571 | struct tpi_info *tpi_info; |
| 572 | struct subchannel *sch; |
| 573 | struct irb *irb; |
| 574 | struct pt_regs *old_regs; |
| 575 | |
| 576 | old_regs = set_irq_regs(regs); |
| 577 | irq_enter(); |
| 578 | __this_cpu_write(s390_idle.nohz_delay, 1); |
| 579 | if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator) |
| 580 | /* Serve timer interrupts first. */ |
| 581 | clock_comparator_work(); |
| 582 | /* |
| 583 | * Get interrupt information from lowcore |
| 584 | */ |
| 585 | tpi_info = (struct tpi_info *)&S390_lowcore.subchannel_id; |
| 586 | irb = (struct irb *)&S390_lowcore.irb; |
| 587 | do { |
| 588 | kstat_incr_irqs_this_cpu(IO_INTERRUPT, NULL); |
| 589 | if (tpi_info->adapter_IO) { |
| 590 | do_adapter_IO(tpi_info->isc); |
| 591 | continue; |
| 592 | } |
| 593 | sch = (struct subchannel *)(unsigned long)tpi_info->intparm; |
| 594 | if (!sch) { |
| 595 | /* Clear pending interrupt condition. */ |
| 596 | inc_irq_stat(IRQIO_CIO); |
| 597 | tsch(tpi_info->schid, irb); |
| 598 | continue; |
| 599 | } |
| 600 | spin_lock(sch->lock); |
| 601 | /* Store interrupt response block to lowcore. */ |
| 602 | if (tsch(tpi_info->schid, irb) == 0) { |
| 603 | /* Keep subchannel information word up to date. */ |
| 604 | memcpy (&sch->schib.scsw, &irb->scsw, |
| 605 | sizeof (irb->scsw)); |
| 606 | /* Call interrupt handler if there is one. */ |
| 607 | if (sch->driver && sch->driver->irq) |
| 608 | sch->driver->irq(sch); |
| 609 | else |
| 610 | inc_irq_stat(IRQIO_CIO); |
| 611 | } else |
| 612 | inc_irq_stat(IRQIO_CIO); |
| 613 | spin_unlock(sch->lock); |
| 614 | /* |
| 615 | * Are more interrupts pending? |
| 616 | * If so, the tpi instruction will update the lowcore |
| 617 | * to hold the info for the next interrupt. |
| 618 | * We don't do this for VM because a tpi drops the cpu |
| 619 | * out of the sie which costs more cycles than it saves. |
| 620 | */ |
| 621 | } while (MACHINE_IS_LPAR && tpi(NULL) != 0); |
| 622 | irq_exit(); |
| 623 | set_irq_regs(old_regs); |
| 624 | } |
| 625 | |
| 626 | #ifdef CONFIG_CCW_CONSOLE |
| 627 | static struct subchannel *console_sch; |
| 628 | |
| 629 | /* |
| 630 | * Use cio_tsch to update the subchannel status and call the interrupt handler |
| 631 | * if status had been pending. Called with the subchannel's lock held. |
| 632 | */ |
| 633 | void cio_tsch(struct subchannel *sch) |
| 634 | { |
| 635 | struct irb *irb; |
| 636 | int irq_context; |
| 637 | |
| 638 | irb = (struct irb *)&S390_lowcore.irb; |
| 639 | /* Store interrupt response block to lowcore. */ |
| 640 | if (tsch(sch->schid, irb) != 0) |
| 641 | /* Not status pending or not operational. */ |
| 642 | return; |
| 643 | memcpy(&sch->schib.scsw, &irb->scsw, sizeof(union scsw)); |
| 644 | /* Call interrupt handler with updated status. */ |
| 645 | irq_context = in_interrupt(); |
| 646 | if (!irq_context) { |
| 647 | local_bh_disable(); |
| 648 | irq_enter(); |
| 649 | } |
| 650 | kstat_incr_irqs_this_cpu(IO_INTERRUPT, NULL); |
| 651 | if (sch->driver && sch->driver->irq) |
| 652 | sch->driver->irq(sch); |
| 653 | else |
| 654 | inc_irq_stat(IRQIO_CIO); |
| 655 | if (!irq_context) { |
| 656 | irq_exit(); |
| 657 | _local_bh_enable(); |
| 658 | } |
| 659 | } |
| 660 | |
| 661 | static int cio_test_for_console(struct subchannel_id schid, void *data) |
| 662 | { |
| 663 | struct schib schib; |
| 664 | |
| 665 | if (stsch_err(schid, &schib) != 0) |
| 666 | return -ENXIO; |
| 667 | if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv && |
| 668 | (schib.pmcw.dev == console_devno)) { |
| 669 | console_irq = schid.sch_no; |
| 670 | return 1; /* found */ |
| 671 | } |
| 672 | return 0; |
| 673 | } |
| 674 | |
| 675 | static int cio_get_console_sch_no(void) |
| 676 | { |
| 677 | struct subchannel_id schid; |
| 678 | struct schib schib; |
| 679 | |
| 680 | init_subchannel_id(&schid); |
| 681 | if (console_irq != -1) { |
| 682 | /* VM provided us with the irq number of the console. */ |
| 683 | schid.sch_no = console_irq; |
| 684 | if (stsch_err(schid, &schib) != 0 || |
| 685 | (schib.pmcw.st != SUBCHANNEL_TYPE_IO) || !schib.pmcw.dnv) |
| 686 | return -1; |
| 687 | console_devno = schib.pmcw.dev; |
| 688 | } else if (console_devno != -1) { |
| 689 | /* At least the console device number is known. */ |
| 690 | for_each_subchannel(cio_test_for_console, NULL); |
| 691 | } |
| 692 | return console_irq; |
| 693 | } |
| 694 | |
| 695 | struct subchannel *cio_probe_console(void) |
| 696 | { |
| 697 | struct subchannel_id schid; |
| 698 | struct subchannel *sch; |
| 699 | int sch_no, ret; |
| 700 | |
| 701 | sch_no = cio_get_console_sch_no(); |
| 702 | if (sch_no == -1) { |
| 703 | pr_warning("No CCW console was found\n"); |
| 704 | return ERR_PTR(-ENODEV); |
| 705 | } |
| 706 | init_subchannel_id(&schid); |
| 707 | schid.sch_no = sch_no; |
| 708 | sch = css_alloc_subchannel(schid); |
| 709 | if (IS_ERR(sch)) |
| 710 | return sch; |
| 711 | |
| 712 | isc_register(CONSOLE_ISC); |
| 713 | sch->config.isc = CONSOLE_ISC; |
| 714 | sch->config.intparm = (u32)(addr_t)sch; |
| 715 | ret = cio_commit_config(sch); |
| 716 | if (ret) { |
| 717 | isc_unregister(CONSOLE_ISC); |
| 718 | put_device(&sch->dev); |
| 719 | return ERR_PTR(ret); |
| 720 | } |
| 721 | console_sch = sch; |
| 722 | return sch; |
| 723 | } |
| 724 | |
| 725 | int cio_is_console(struct subchannel_id schid) |
| 726 | { |
| 727 | if (!console_sch) |
| 728 | return 0; |
| 729 | return schid_equal(&schid, &console_sch->schid); |
| 730 | } |
| 731 | |
| 732 | void cio_register_early_subchannels(void) |
| 733 | { |
| 734 | int ret; |
| 735 | |
| 736 | if (!console_sch) |
| 737 | return; |
| 738 | |
| 739 | ret = css_register_subchannel(console_sch); |
| 740 | if (ret) |
| 741 | put_device(&console_sch->dev); |
| 742 | } |
| 743 | #endif /* CONFIG_CCW_CONSOLE */ |
| 744 | |
| 745 | static int |
| 746 | __disable_subchannel_easy(struct subchannel_id schid, struct schib *schib) |
| 747 | { |
| 748 | int retry, cc; |
| 749 | |
| 750 | cc = 0; |
| 751 | for (retry=0;retry<3;retry++) { |
| 752 | schib->pmcw.ena = 0; |
| 753 | cc = msch_err(schid, schib); |
| 754 | if (cc) |
| 755 | return (cc==3?-ENODEV:-EBUSY); |
| 756 | if (stsch_err(schid, schib) || !css_sch_is_valid(schib)) |
| 757 | return -ENODEV; |
| 758 | if (!schib->pmcw.ena) |
| 759 | return 0; |
| 760 | } |
| 761 | return -EBUSY; /* uhm... */ |
| 762 | } |
| 763 | |
| 764 | static int |
| 765 | __clear_io_subchannel_easy(struct subchannel_id schid) |
| 766 | { |
| 767 | int retry; |
| 768 | |
| 769 | if (csch(schid)) |
| 770 | return -ENODEV; |
| 771 | for (retry=0;retry<20;retry++) { |
| 772 | struct tpi_info ti; |
| 773 | |
| 774 | if (tpi(&ti)) { |
| 775 | tsch(ti.schid, (struct irb *)&S390_lowcore.irb); |
| 776 | if (schid_equal(&ti.schid, &schid)) |
| 777 | return 0; |
| 778 | } |
| 779 | udelay_simple(100); |
| 780 | } |
| 781 | return -EBUSY; |
| 782 | } |
| 783 | |
| 784 | static void __clear_chsc_subchannel_easy(void) |
| 785 | { |
| 786 | /* It seems we can only wait for a bit here :/ */ |
| 787 | udelay_simple(100); |
| 788 | } |
| 789 | |
| 790 | static int pgm_check_occured; |
| 791 | |
| 792 | static void cio_reset_pgm_check_handler(void) |
| 793 | { |
| 794 | pgm_check_occured = 1; |
| 795 | } |
| 796 | |
| 797 | static int stsch_reset(struct subchannel_id schid, struct schib *addr) |
| 798 | { |
| 799 | int rc; |
| 800 | |
| 801 | pgm_check_occured = 0; |
| 802 | s390_base_pgm_handler_fn = cio_reset_pgm_check_handler; |
| 803 | rc = stsch_err(schid, addr); |
| 804 | s390_base_pgm_handler_fn = NULL; |
| 805 | |
| 806 | /* The program check handler could have changed pgm_check_occured. */ |
| 807 | barrier(); |
| 808 | |
| 809 | if (pgm_check_occured) |
| 810 | return -EIO; |
| 811 | else |
| 812 | return rc; |
| 813 | } |
| 814 | |
| 815 | static int __shutdown_subchannel_easy(struct subchannel_id schid, void *data) |
| 816 | { |
| 817 | struct schib schib; |
| 818 | |
| 819 | if (stsch_reset(schid, &schib)) |
| 820 | return -ENXIO; |
| 821 | if (!schib.pmcw.ena) |
| 822 | return 0; |
| 823 | switch(__disable_subchannel_easy(schid, &schib)) { |
| 824 | case 0: |
| 825 | case -ENODEV: |
| 826 | break; |
| 827 | default: /* -EBUSY */ |
| 828 | switch (schib.pmcw.st) { |
| 829 | case SUBCHANNEL_TYPE_IO: |
| 830 | if (__clear_io_subchannel_easy(schid)) |
| 831 | goto out; /* give up... */ |
| 832 | break; |
| 833 | case SUBCHANNEL_TYPE_CHSC: |
| 834 | __clear_chsc_subchannel_easy(); |
| 835 | break; |
| 836 | default: |
| 837 | /* No default clear strategy */ |
| 838 | break; |
| 839 | } |
| 840 | stsch_err(schid, &schib); |
| 841 | __disable_subchannel_easy(schid, &schib); |
| 842 | } |
| 843 | out: |
| 844 | return 0; |
| 845 | } |
| 846 | |
| 847 | static atomic_t chpid_reset_count; |
| 848 | |
| 849 | static void s390_reset_chpids_mcck_handler(void) |
| 850 | { |
| 851 | struct crw crw; |
| 852 | struct mci *mci; |
| 853 | |
| 854 | /* Check for pending channel report word. */ |
| 855 | mci = (struct mci *)&S390_lowcore.mcck_interruption_code; |
| 856 | if (!mci->cp) |
| 857 | return; |
| 858 | /* Process channel report words. */ |
| 859 | while (stcrw(&crw) == 0) { |
| 860 | /* Check for responses to RCHP. */ |
| 861 | if (crw.slct && crw.rsc == CRW_RSC_CPATH) |
| 862 | atomic_dec(&chpid_reset_count); |
| 863 | } |
| 864 | } |
| 865 | |
| 866 | #define RCHP_TIMEOUT (30 * USEC_PER_SEC) |
| 867 | static void css_reset(void) |
| 868 | { |
| 869 | int i, ret; |
| 870 | unsigned long long timeout; |
| 871 | struct chp_id chpid; |
| 872 | |
| 873 | /* Reset subchannels. */ |
| 874 | for_each_subchannel(__shutdown_subchannel_easy, NULL); |
| 875 | /* Reset channel paths. */ |
| 876 | s390_base_mcck_handler_fn = s390_reset_chpids_mcck_handler; |
| 877 | /* Enable channel report machine checks. */ |
| 878 | __ctl_set_bit(14, 28); |
| 879 | /* Temporarily reenable machine checks. */ |
| 880 | local_mcck_enable(); |
| 881 | chp_id_init(&chpid); |
| 882 | for (i = 0; i <= __MAX_CHPID; i++) { |
| 883 | chpid.id = i; |
| 884 | ret = rchp(chpid); |
| 885 | if ((ret == 0) || (ret == 2)) |
| 886 | /* |
| 887 | * rchp either succeeded, or another rchp is already |
| 888 | * in progress. In either case, we'll get a crw. |
| 889 | */ |
| 890 | atomic_inc(&chpid_reset_count); |
| 891 | } |
| 892 | /* Wait for machine check for all channel paths. */ |
| 893 | timeout = get_tod_clock() + (RCHP_TIMEOUT << 12); |
| 894 | while (atomic_read(&chpid_reset_count) != 0) { |
| 895 | if (get_tod_clock() > timeout) |
| 896 | break; |
| 897 | cpu_relax(); |
| 898 | } |
| 899 | /* Disable machine checks again. */ |
| 900 | local_mcck_disable(); |
| 901 | /* Disable channel report machine checks. */ |
| 902 | __ctl_clear_bit(14, 28); |
| 903 | s390_base_mcck_handler_fn = NULL; |
| 904 | } |
| 905 | |
| 906 | static struct reset_call css_reset_call = { |
| 907 | .fn = css_reset, |
| 908 | }; |
| 909 | |
| 910 | static int __init init_css_reset_call(void) |
| 911 | { |
| 912 | atomic_set(&chpid_reset_count, 0); |
| 913 | register_reset_call(&css_reset_call); |
| 914 | return 0; |
| 915 | } |
| 916 | |
| 917 | arch_initcall(init_css_reset_call); |
| 918 | |
| 919 | struct sch_match_id { |
| 920 | struct subchannel_id schid; |
| 921 | struct ccw_dev_id devid; |
| 922 | int rc; |
| 923 | }; |
| 924 | |
| 925 | static int __reipl_subchannel_match(struct subchannel_id schid, void *data) |
| 926 | { |
| 927 | struct schib schib; |
| 928 | struct sch_match_id *match_id = data; |
| 929 | |
| 930 | if (stsch_reset(schid, &schib)) |
| 931 | return -ENXIO; |
| 932 | if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv && |
| 933 | (schib.pmcw.dev == match_id->devid.devno) && |
| 934 | (schid.ssid == match_id->devid.ssid)) { |
| 935 | match_id->schid = schid; |
| 936 | match_id->rc = 0; |
| 937 | return 1; |
| 938 | } |
| 939 | return 0; |
| 940 | } |
| 941 | |
| 942 | static int reipl_find_schid(struct ccw_dev_id *devid, |
| 943 | struct subchannel_id *schid) |
| 944 | { |
| 945 | struct sch_match_id match_id; |
| 946 | |
| 947 | match_id.devid = *devid; |
| 948 | match_id.rc = -ENODEV; |
| 949 | for_each_subchannel(__reipl_subchannel_match, &match_id); |
| 950 | if (match_id.rc == 0) |
| 951 | *schid = match_id.schid; |
| 952 | return match_id.rc; |
| 953 | } |
| 954 | |
| 955 | extern void do_reipl_asm(__u32 schid); |
| 956 | |
| 957 | /* Make sure all subchannels are quiet before we re-ipl an lpar. */ |
| 958 | void reipl_ccw_dev(struct ccw_dev_id *devid) |
| 959 | { |
| 960 | struct subchannel_id uninitialized_var(schid); |
| 961 | |
| 962 | s390_reset_system(NULL, NULL); |
| 963 | if (reipl_find_schid(devid, &schid) != 0) |
| 964 | panic("IPL Device not found\n"); |
| 965 | do_reipl_asm(*((__u32*)&schid)); |
| 966 | } |
| 967 | |
| 968 | int __init cio_get_iplinfo(struct cio_iplinfo *iplinfo) |
| 969 | { |
| 970 | struct subchannel_id schid; |
| 971 | struct schib schib; |
| 972 | |
| 973 | schid = *(struct subchannel_id *)&S390_lowcore.subchannel_id; |
| 974 | if (!schid.one) |
| 975 | return -ENODEV; |
| 976 | if (stsch_err(schid, &schib)) |
| 977 | return -ENODEV; |
| 978 | if (schib.pmcw.st != SUBCHANNEL_TYPE_IO) |
| 979 | return -ENODEV; |
| 980 | if (!schib.pmcw.dnv) |
| 981 | return -ENODEV; |
| 982 | iplinfo->devno = schib.pmcw.dev; |
| 983 | iplinfo->is_qdio = schib.pmcw.qf; |
| 984 | return 0; |
| 985 | } |
| 986 | |
| 987 | /** |
| 988 | * cio_tm_start_key - perform start function |
| 989 | * @sch: subchannel on which to perform the start function |
| 990 | * @tcw: transport-command word to be started |
| 991 | * @lpm: mask of paths to use |
| 992 | * @key: storage key to use for storage access |
| 993 | * |
| 994 | * Start the tcw on the given subchannel. Return zero on success, non-zero |
| 995 | * otherwise. |
| 996 | */ |
| 997 | int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key) |
| 998 | { |
| 999 | int cc; |
| 1000 | union orb *orb = &to_io_private(sch)->orb; |
| 1001 | |
| 1002 | memset(orb, 0, sizeof(union orb)); |
| 1003 | orb->tm.intparm = (u32) (addr_t) sch; |
| 1004 | orb->tm.key = key >> 4; |
| 1005 | orb->tm.b = 1; |
| 1006 | orb->tm.lpm = lpm ? lpm : sch->lpm; |
| 1007 | orb->tm.tcw = (u32) (addr_t) tcw; |
| 1008 | cc = ssch(sch->schid, orb); |
| 1009 | switch (cc) { |
| 1010 | case 0: |
| 1011 | return 0; |
| 1012 | case 1: |
| 1013 | case 2: |
| 1014 | return -EBUSY; |
| 1015 | default: |
| 1016 | return cio_start_handle_notoper(sch, lpm); |
| 1017 | } |
| 1018 | } |
| 1019 | |
| 1020 | /** |
| 1021 | * cio_tm_intrg - perform interrogate function |
| 1022 | * @sch - subchannel on which to perform the interrogate function |
| 1023 | * |
| 1024 | * If the specified subchannel is running in transport-mode, perform the |
| 1025 | * interrogate function. Return zero on success, non-zero otherwie. |
| 1026 | */ |
| 1027 | int cio_tm_intrg(struct subchannel *sch) |
| 1028 | { |
| 1029 | int cc; |
| 1030 | |
| 1031 | if (!to_io_private(sch)->orb.tm.b) |
| 1032 | return -EINVAL; |
| 1033 | cc = xsch(sch->schid); |
| 1034 | switch (cc) { |
| 1035 | case 0: |
| 1036 | case 2: |
| 1037 | return 0; |
| 1038 | case 1: |
| 1039 | return -EBUSY; |
| 1040 | default: |
| 1041 | return -ENODEV; |
| 1042 | } |
| 1043 | } |