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 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
| 5 | * Copyright (C) 1999-2002 IBM Deutschland Entwicklung GmbH, |
| 6 | * IBM Corporation |
| 7 | * Author(s): Ingo Adlung (adlung@de.ibm.com) |
Cornelia Huck | 4ce3b30 | 2006-01-14 13:21:04 -0800 | [diff] [blame] | 8 | * Cornelia Huck (cornelia.huck@de.ibm.com) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | * Arnd Bergmann (arndb@de.ibm.com) |
| 10 | * Martin Schwidefsky (schwidefsky@de.ibm.com) |
| 11 | */ |
| 12 | |
| 13 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/init.h> |
| 15 | #include <linux/slab.h> |
| 16 | #include <linux/device.h> |
| 17 | #include <linux/kernel_stat.h> |
| 18 | #include <linux/interrupt.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <asm/cio.h> |
| 20 | #include <asm/delay.h> |
| 21 | #include <asm/irq.h> |
Heiko Carstens | e87bfe5 | 2006-09-20 15:59:15 +0200 | [diff] [blame] | 22 | #include <asm/setup.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include "airq.h" |
| 24 | #include "cio.h" |
| 25 | #include "css.h" |
| 26 | #include "chsc.h" |
| 27 | #include "ioasm.h" |
| 28 | #include "blacklist.h" |
| 29 | #include "cio_debug.h" |
| 30 | |
| 31 | debug_info_t *cio_debug_msg_id; |
| 32 | debug_info_t *cio_debug_trace_id; |
| 33 | debug_info_t *cio_debug_crw_id; |
| 34 | |
| 35 | int cio_show_msg; |
| 36 | |
| 37 | static int __init |
| 38 | cio_setup (char *parm) |
| 39 | { |
| 40 | if (!strcmp (parm, "yes")) |
| 41 | cio_show_msg = 1; |
| 42 | else if (!strcmp (parm, "no")) |
| 43 | cio_show_msg = 0; |
| 44 | else |
| 45 | printk (KERN_ERR "cio_setup : invalid cio_msg parameter '%s'", |
| 46 | parm); |
| 47 | return 1; |
| 48 | } |
| 49 | |
| 50 | __setup ("cio_msg=", cio_setup); |
| 51 | |
| 52 | /* |
| 53 | * Function: cio_debug_init |
| 54 | * Initializes three debug logs (under /proc/s390dbf) for common I/O: |
| 55 | * - cio_msg logs the messages which are printk'ed when CONFIG_DEBUG_IO is on |
| 56 | * - cio_trace logs the calling of different functions |
| 57 | * - cio_crw logs the messages which are printk'ed when CONFIG_DEBUG_CRW is on |
| 58 | * debug levels depend on CONFIG_DEBUG_IO resp. CONFIG_DEBUG_CRW |
| 59 | */ |
| 60 | static int __init |
| 61 | cio_debug_init (void) |
| 62 | { |
Michael Holzheu | 66a464d | 2005-06-25 14:55:33 -0700 | [diff] [blame] | 63 | cio_debug_msg_id = debug_register ("cio_msg", 16, 4, 16*sizeof (long)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | if (!cio_debug_msg_id) |
| 65 | goto out_unregister; |
| 66 | debug_register_view (cio_debug_msg_id, &debug_sprintf_view); |
| 67 | debug_set_level (cio_debug_msg_id, 2); |
Peter Oberparleiter | 06fbcb1 | 2006-04-10 22:53:46 -0700 | [diff] [blame] | 68 | cio_debug_trace_id = debug_register ("cio_trace", 16, 4, 16); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | if (!cio_debug_trace_id) |
| 70 | goto out_unregister; |
| 71 | debug_register_view (cio_debug_trace_id, &debug_hex_ascii_view); |
| 72 | debug_set_level (cio_debug_trace_id, 2); |
Michael Holzheu | 66a464d | 2005-06-25 14:55:33 -0700 | [diff] [blame] | 73 | cio_debug_crw_id = debug_register ("cio_crw", 4, 4, 16*sizeof (long)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | if (!cio_debug_crw_id) |
| 75 | goto out_unregister; |
| 76 | debug_register_view (cio_debug_crw_id, &debug_sprintf_view); |
| 77 | debug_set_level (cio_debug_crw_id, 2); |
| 78 | pr_debug("debugging initialized\n"); |
| 79 | return 0; |
| 80 | |
| 81 | out_unregister: |
| 82 | if (cio_debug_msg_id) |
| 83 | debug_unregister (cio_debug_msg_id); |
| 84 | if (cio_debug_trace_id) |
| 85 | debug_unregister (cio_debug_trace_id); |
| 86 | if (cio_debug_crw_id) |
| 87 | debug_unregister (cio_debug_crw_id); |
| 88 | pr_debug("could not initialize debugging\n"); |
| 89 | return -1; |
| 90 | } |
| 91 | |
| 92 | arch_initcall (cio_debug_init); |
| 93 | |
| 94 | int |
| 95 | cio_set_options (struct subchannel *sch, int flags) |
| 96 | { |
| 97 | sch->options.suspend = (flags & DOIO_ALLOW_SUSPEND) != 0; |
| 98 | sch->options.prefetch = (flags & DOIO_DENY_PREFETCH) != 0; |
| 99 | sch->options.inter = (flags & DOIO_SUPPRESS_INTER) != 0; |
| 100 | return 0; |
| 101 | } |
| 102 | |
| 103 | /* FIXME: who wants to use this? */ |
| 104 | int |
| 105 | cio_get_options (struct subchannel *sch) |
| 106 | { |
| 107 | int flags; |
| 108 | |
| 109 | flags = 0; |
| 110 | if (sch->options.suspend) |
| 111 | flags |= DOIO_ALLOW_SUSPEND; |
| 112 | if (sch->options.prefetch) |
| 113 | flags |= DOIO_DENY_PREFETCH; |
| 114 | if (sch->options.inter) |
| 115 | flags |= DOIO_SUPPRESS_INTER; |
| 116 | return flags; |
| 117 | } |
| 118 | |
| 119 | /* |
| 120 | * Use tpi to get a pending interrupt, call the interrupt handler and |
| 121 | * return a pointer to the subchannel structure. |
| 122 | */ |
| 123 | static inline int |
| 124 | cio_tpi(void) |
| 125 | { |
| 126 | struct tpi_info *tpi_info; |
| 127 | struct subchannel *sch; |
| 128 | struct irb *irb; |
| 129 | |
| 130 | tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID; |
| 131 | if (tpi (NULL) != 1) |
| 132 | return 0; |
| 133 | irb = (struct irb *) __LC_IRB; |
| 134 | /* Store interrupt response block to lowcore. */ |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 135 | if (tsch (tpi_info->schid, irb) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | /* Not status pending or not operational. */ |
| 137 | return 1; |
| 138 | sch = (struct subchannel *)(unsigned long)tpi_info->intparm; |
| 139 | if (!sch) |
| 140 | return 1; |
| 141 | local_bh_disable(); |
| 142 | irq_enter (); |
| 143 | spin_lock(&sch->lock); |
| 144 | memcpy (&sch->schib.scsw, &irb->scsw, sizeof (struct scsw)); |
| 145 | if (sch->driver && sch->driver->irq) |
| 146 | sch->driver->irq(&sch->dev); |
| 147 | spin_unlock(&sch->lock); |
| 148 | irq_exit (); |
Heiko Carstens | 1f194a4 | 2006-07-03 00:24:46 -0700 | [diff] [blame] | 149 | _local_bh_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | return 1; |
| 151 | } |
| 152 | |
| 153 | static inline int |
| 154 | cio_start_handle_notoper(struct subchannel *sch, __u8 lpm) |
| 155 | { |
| 156 | char dbf_text[15]; |
| 157 | |
| 158 | if (lpm != 0) |
| 159 | sch->lpm &= ~lpm; |
| 160 | else |
| 161 | sch->lpm = 0; |
| 162 | |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 163 | stsch (sch->schid, &sch->schib); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | |
| 165 | CIO_MSG_EVENT(0, "cio_start: 'not oper' status for " |
Cornelia Huck | fb6958a | 2006-01-06 00:19:25 -0800 | [diff] [blame] | 166 | "subchannel 0.%x.%04x!\n", sch->schid.ssid, |
| 167 | sch->schid.sch_no); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | sprintf(dbf_text, "no%s", sch->dev.bus_id); |
| 169 | CIO_TRACE_EVENT(0, dbf_text); |
| 170 | CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib)); |
| 171 | |
| 172 | return (sch->lpm ? -EACCES : -ENODEV); |
| 173 | } |
| 174 | |
| 175 | int |
| 176 | cio_start_key (struct subchannel *sch, /* subchannel structure */ |
| 177 | struct ccw1 * cpa, /* logical channel prog addr */ |
| 178 | __u8 lpm, /* logical path mask */ |
| 179 | __u8 key) /* storage key */ |
| 180 | { |
| 181 | char dbf_txt[15]; |
| 182 | int ccode; |
| 183 | |
| 184 | CIO_TRACE_EVENT (4, "stIO"); |
| 185 | CIO_TRACE_EVENT (4, sch->dev.bus_id); |
| 186 | |
| 187 | /* sch is always under 2G. */ |
| 188 | sch->orb.intparm = (__u32)(unsigned long)sch; |
| 189 | sch->orb.fmt = 1; |
| 190 | |
| 191 | sch->orb.pfch = sch->options.prefetch == 0; |
| 192 | sch->orb.spnd = sch->options.suspend; |
| 193 | sch->orb.ssic = sch->options.suspend && sch->options.inter; |
Peter Oberparleiter | e0e32c8 | 2006-09-20 15:59:57 +0200 | [diff] [blame] | 194 | sch->orb.lpm = (lpm != 0) ? lpm : sch->lpm; |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 195 | #ifdef CONFIG_64BIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | /* |
| 197 | * for 64 bit we always support 64 bit IDAWs with 4k page size only |
| 198 | */ |
| 199 | sch->orb.c64 = 1; |
| 200 | sch->orb.i2k = 0; |
| 201 | #endif |
| 202 | sch->orb.key = key >> 4; |
| 203 | /* issue "Start Subchannel" */ |
| 204 | sch->orb.cpa = (__u32) __pa (cpa); |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 205 | ccode = ssch (sch->schid, &sch->orb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | |
| 207 | /* process condition code */ |
| 208 | sprintf (dbf_txt, "ccode:%d", ccode); |
| 209 | CIO_TRACE_EVENT (4, dbf_txt); |
| 210 | |
| 211 | switch (ccode) { |
| 212 | case 0: |
| 213 | /* |
| 214 | * initialize device status information |
| 215 | */ |
| 216 | sch->schib.scsw.actl |= SCSW_ACTL_START_PEND; |
| 217 | return 0; |
| 218 | case 1: /* status pending */ |
| 219 | case 2: /* busy */ |
| 220 | return -EBUSY; |
| 221 | default: /* device/path not operational */ |
| 222 | return cio_start_handle_notoper(sch, lpm); |
| 223 | } |
| 224 | } |
| 225 | |
| 226 | int |
| 227 | cio_start (struct subchannel *sch, struct ccw1 *cpa, __u8 lpm) |
| 228 | { |
Peter Oberparleiter | 0b642ed | 2005-05-01 08:58:58 -0700 | [diff] [blame] | 229 | return cio_start_key(sch, cpa, lpm, PAGE_DEFAULT_KEY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | } |
| 231 | |
| 232 | /* |
| 233 | * resume suspended I/O operation |
| 234 | */ |
| 235 | int |
| 236 | cio_resume (struct subchannel *sch) |
| 237 | { |
| 238 | char dbf_txt[15]; |
| 239 | int ccode; |
| 240 | |
| 241 | CIO_TRACE_EVENT (4, "resIO"); |
| 242 | CIO_TRACE_EVENT (4, sch->dev.bus_id); |
| 243 | |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 244 | ccode = rsch (sch->schid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | |
| 246 | sprintf (dbf_txt, "ccode:%d", ccode); |
| 247 | CIO_TRACE_EVENT (4, dbf_txt); |
| 248 | |
| 249 | switch (ccode) { |
| 250 | case 0: |
| 251 | sch->schib.scsw.actl |= SCSW_ACTL_RESUME_PEND; |
| 252 | return 0; |
| 253 | case 1: |
| 254 | return -EBUSY; |
| 255 | case 2: |
| 256 | return -EINVAL; |
| 257 | default: |
| 258 | /* |
| 259 | * useless to wait for request completion |
| 260 | * as device is no longer operational ! |
| 261 | */ |
| 262 | return -ENODEV; |
| 263 | } |
| 264 | } |
| 265 | |
| 266 | /* |
| 267 | * halt I/O operation |
| 268 | */ |
| 269 | int |
| 270 | cio_halt(struct subchannel *sch) |
| 271 | { |
| 272 | char dbf_txt[15]; |
| 273 | int ccode; |
| 274 | |
| 275 | if (!sch) |
| 276 | return -ENODEV; |
| 277 | |
| 278 | CIO_TRACE_EVENT (2, "haltIO"); |
| 279 | CIO_TRACE_EVENT (2, sch->dev.bus_id); |
| 280 | |
| 281 | /* |
| 282 | * Issue "Halt subchannel" and process condition code |
| 283 | */ |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 284 | ccode = hsch (sch->schid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | |
| 286 | sprintf (dbf_txt, "ccode:%d", ccode); |
| 287 | CIO_TRACE_EVENT (2, dbf_txt); |
| 288 | |
| 289 | switch (ccode) { |
| 290 | case 0: |
| 291 | sch->schib.scsw.actl |= SCSW_ACTL_HALT_PEND; |
| 292 | return 0; |
| 293 | case 1: /* status pending */ |
| 294 | case 2: /* busy */ |
| 295 | return -EBUSY; |
| 296 | default: /* device not operational */ |
| 297 | return -ENODEV; |
| 298 | } |
| 299 | } |
| 300 | |
| 301 | /* |
| 302 | * Clear I/O operation |
| 303 | */ |
| 304 | int |
| 305 | cio_clear(struct subchannel *sch) |
| 306 | { |
| 307 | char dbf_txt[15]; |
| 308 | int ccode; |
| 309 | |
| 310 | if (!sch) |
| 311 | return -ENODEV; |
| 312 | |
| 313 | CIO_TRACE_EVENT (2, "clearIO"); |
| 314 | CIO_TRACE_EVENT (2, sch->dev.bus_id); |
| 315 | |
| 316 | /* |
| 317 | * Issue "Clear subchannel" and process condition code |
| 318 | */ |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 319 | ccode = csch (sch->schid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | |
| 321 | sprintf (dbf_txt, "ccode:%d", ccode); |
| 322 | CIO_TRACE_EVENT (2, dbf_txt); |
| 323 | |
| 324 | switch (ccode) { |
| 325 | case 0: |
| 326 | sch->schib.scsw.actl |= SCSW_ACTL_CLEAR_PEND; |
| 327 | return 0; |
| 328 | default: /* device not operational */ |
| 329 | return -ENODEV; |
| 330 | } |
| 331 | } |
| 332 | |
| 333 | /* |
| 334 | * Function: cio_cancel |
| 335 | * Issues a "Cancel Subchannel" on the specified subchannel |
| 336 | * Note: We don't need any fancy intparms and flags here |
| 337 | * since xsch is executed synchronously. |
| 338 | * Only for common I/O internal use as for now. |
| 339 | */ |
| 340 | int |
| 341 | cio_cancel (struct subchannel *sch) |
| 342 | { |
| 343 | char dbf_txt[15]; |
| 344 | int ccode; |
| 345 | |
| 346 | if (!sch) |
| 347 | return -ENODEV; |
| 348 | |
| 349 | CIO_TRACE_EVENT (2, "cancelIO"); |
| 350 | CIO_TRACE_EVENT (2, sch->dev.bus_id); |
| 351 | |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 352 | ccode = xsch (sch->schid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | |
| 354 | sprintf (dbf_txt, "ccode:%d", ccode); |
| 355 | CIO_TRACE_EVENT (2, dbf_txt); |
| 356 | |
| 357 | switch (ccode) { |
| 358 | case 0: /* success */ |
| 359 | /* Update information in scsw. */ |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 360 | stsch (sch->schid, &sch->schib); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | return 0; |
| 362 | case 1: /* status pending */ |
| 363 | return -EBUSY; |
| 364 | case 2: /* not applicable */ |
| 365 | return -EINVAL; |
| 366 | default: /* not oper */ |
| 367 | return -ENODEV; |
| 368 | } |
| 369 | } |
| 370 | |
| 371 | /* |
| 372 | * Function: cio_modify |
| 373 | * Issues a "Modify Subchannel" on the specified subchannel |
| 374 | */ |
| 375 | int |
| 376 | cio_modify (struct subchannel *sch) |
| 377 | { |
| 378 | int ccode, retry, ret; |
| 379 | |
| 380 | ret = 0; |
| 381 | for (retry = 0; retry < 5; retry++) { |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 382 | ccode = msch_err (sch->schid, &sch->schib); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | if (ccode < 0) /* -EIO if msch gets a program check. */ |
| 384 | return ccode; |
| 385 | switch (ccode) { |
| 386 | case 0: /* successfull */ |
| 387 | return 0; |
| 388 | case 1: /* status pending */ |
| 389 | return -EBUSY; |
| 390 | case 2: /* busy */ |
| 391 | udelay (100); /* allow for recovery */ |
| 392 | ret = -EBUSY; |
| 393 | break; |
| 394 | case 3: /* not operational */ |
| 395 | return -ENODEV; |
| 396 | } |
| 397 | } |
| 398 | return ret; |
| 399 | } |
| 400 | |
| 401 | /* |
| 402 | * Enable subchannel. |
| 403 | */ |
| 404 | int |
| 405 | cio_enable_subchannel (struct subchannel *sch, unsigned int isc) |
| 406 | { |
| 407 | char dbf_txt[15]; |
| 408 | int ccode; |
| 409 | int retry; |
| 410 | int ret; |
| 411 | |
| 412 | CIO_TRACE_EVENT (2, "ensch"); |
| 413 | CIO_TRACE_EVENT (2, sch->dev.bus_id); |
| 414 | |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 415 | ccode = stsch (sch->schid, &sch->schib); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | if (ccode) |
| 417 | return -ENODEV; |
| 418 | |
| 419 | for (retry = 5, ret = 0; retry > 0; retry--) { |
| 420 | sch->schib.pmcw.ena = 1; |
| 421 | sch->schib.pmcw.isc = isc; |
| 422 | sch->schib.pmcw.intparm = (__u32)(unsigned long)sch; |
| 423 | ret = cio_modify(sch); |
| 424 | if (ret == -ENODEV) |
| 425 | break; |
| 426 | if (ret == -EIO) |
| 427 | /* |
| 428 | * Got a program check in cio_modify. Try without |
| 429 | * the concurrent sense bit the next time. |
| 430 | */ |
| 431 | sch->schib.pmcw.csense = 0; |
| 432 | if (ret == 0) { |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 433 | stsch (sch->schid, &sch->schib); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | if (sch->schib.pmcw.ena) |
| 435 | break; |
| 436 | } |
| 437 | if (ret == -EBUSY) { |
| 438 | struct irb irb; |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 439 | if (tsch(sch->schid, &irb) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | break; |
| 441 | } |
| 442 | } |
| 443 | sprintf (dbf_txt, "ret:%d", ret); |
| 444 | CIO_TRACE_EVENT (2, dbf_txt); |
| 445 | return ret; |
| 446 | } |
| 447 | |
| 448 | /* |
| 449 | * Disable subchannel. |
| 450 | */ |
| 451 | int |
| 452 | cio_disable_subchannel (struct subchannel *sch) |
| 453 | { |
| 454 | char dbf_txt[15]; |
| 455 | int ccode; |
| 456 | int retry; |
| 457 | int ret; |
| 458 | |
| 459 | CIO_TRACE_EVENT (2, "dissch"); |
| 460 | CIO_TRACE_EVENT (2, sch->dev.bus_id); |
| 461 | |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 462 | ccode = stsch (sch->schid, &sch->schib); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | if (ccode == 3) /* Not operational. */ |
| 464 | return -ENODEV; |
| 465 | |
| 466 | if (sch->schib.scsw.actl != 0) |
| 467 | /* |
| 468 | * the disable function must not be called while there are |
| 469 | * requests pending for completion ! |
| 470 | */ |
| 471 | return -EBUSY; |
| 472 | |
| 473 | for (retry = 5, ret = 0; retry > 0; retry--) { |
| 474 | sch->schib.pmcw.ena = 0; |
| 475 | ret = cio_modify(sch); |
| 476 | if (ret == -ENODEV) |
| 477 | break; |
| 478 | if (ret == -EBUSY) |
| 479 | /* |
| 480 | * The subchannel is busy or status pending. |
| 481 | * We'll disable when the next interrupt was delivered |
| 482 | * via the state machine. |
| 483 | */ |
| 484 | break; |
| 485 | if (ret == 0) { |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 486 | stsch (sch->schid, &sch->schib); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | if (!sch->schib.pmcw.ena) |
| 488 | break; |
| 489 | } |
| 490 | } |
| 491 | sprintf (dbf_txt, "ret:%d", ret); |
| 492 | CIO_TRACE_EVENT (2, dbf_txt); |
| 493 | return ret; |
| 494 | } |
| 495 | |
| 496 | /* |
| 497 | * cio_validate_subchannel() |
| 498 | * |
| 499 | * Find out subchannel type and initialize struct subchannel. |
| 500 | * Return codes: |
| 501 | * SUBCHANNEL_TYPE_IO for a normal io subchannel |
| 502 | * SUBCHANNEL_TYPE_CHSC for a chsc subchannel |
| 503 | * SUBCHANNEL_TYPE_MESSAGE for a messaging subchannel |
| 504 | * SUBCHANNEL_TYPE_ADM for a adm(?) subchannel |
| 505 | * -ENXIO for non-defined subchannels |
| 506 | * -ENODEV for subchannels with invalid device number or blacklisted devices |
| 507 | */ |
| 508 | int |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 509 | cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | { |
| 511 | char dbf_txt[15]; |
| 512 | int ccode; |
| 513 | |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 514 | sprintf (dbf_txt, "valsch%x", schid.sch_no); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | CIO_TRACE_EVENT (4, dbf_txt); |
| 516 | |
| 517 | /* Nuke all fields. */ |
| 518 | memset(sch, 0, sizeof(struct subchannel)); |
| 519 | |
| 520 | spin_lock_init(&sch->lock); |
Cornelia Huck | 6ab4879 | 2006-07-12 16:39:50 +0200 | [diff] [blame] | 521 | mutex_init(&sch->reg_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | |
| 523 | /* Set a name for the subchannel */ |
Cornelia Huck | fb6958a | 2006-01-06 00:19:25 -0800 | [diff] [blame] | 524 | snprintf (sch->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x", schid.ssid, |
| 525 | schid.sch_no); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | |
| 527 | /* |
| 528 | * The first subchannel that is not-operational (ccode==3) |
| 529 | * indicates that there aren't any more devices available. |
Cornelia Huck | fb6958a | 2006-01-06 00:19:25 -0800 | [diff] [blame] | 530 | * If stsch gets an exception, it means the current subchannel set |
| 531 | * is not valid. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | */ |
Cornelia Huck | fb6958a | 2006-01-06 00:19:25 -0800 | [diff] [blame] | 533 | ccode = stsch_err (schid, &sch->schib); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | if (ccode) |
Cornelia Huck | fb6958a | 2006-01-06 00:19:25 -0800 | [diff] [blame] | 535 | return (ccode == 3) ? -ENXIO : ccode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 537 | sch->schid = schid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | /* Copy subchannel type from path management control word. */ |
| 539 | sch->st = sch->schib.pmcw.st; |
| 540 | |
| 541 | /* |
| 542 | * ... just being curious we check for non I/O subchannels |
| 543 | */ |
| 544 | if (sch->st != 0) { |
| 545 | CIO_DEBUG(KERN_INFO, 0, |
Cornelia Huck | fb6958a | 2006-01-06 00:19:25 -0800 | [diff] [blame] | 546 | "Subchannel 0.%x.%04x reports " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | "non-I/O subchannel type %04X\n", |
Cornelia Huck | fb6958a | 2006-01-06 00:19:25 -0800 | [diff] [blame] | 548 | sch->schid.ssid, sch->schid.sch_no, sch->st); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | /* We stop here for non-io subchannels. */ |
| 550 | return sch->st; |
| 551 | } |
| 552 | |
| 553 | /* Initialization for io subchannels. */ |
| 554 | if (!sch->schib.pmcw.dnv) |
| 555 | /* io subchannel but device number is invalid. */ |
| 556 | return -ENODEV; |
| 557 | |
| 558 | /* Devno is valid. */ |
Cornelia Huck | fb6958a | 2006-01-06 00:19:25 -0800 | [diff] [blame] | 559 | if (is_blacklisted (sch->schid.ssid, sch->schib.pmcw.dev)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | /* |
| 561 | * This device must not be known to Linux. So we simply |
| 562 | * say that there is no device and return ENODEV. |
| 563 | */ |
| 564 | CIO_MSG_EVENT(0, "Blacklisted device detected " |
Cornelia Huck | fb6958a | 2006-01-06 00:19:25 -0800 | [diff] [blame] | 565 | "at devno %04X, subchannel set %x\n", |
| 566 | sch->schib.pmcw.dev, sch->schid.ssid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | return -ENODEV; |
| 568 | } |
| 569 | sch->opm = 0xff; |
Cornelia Huck | fb6958a | 2006-01-06 00:19:25 -0800 | [diff] [blame] | 570 | if (!cio_is_console(sch->schid)) |
| 571 | chsc_validate_chpids(sch); |
Peter Oberparleiter | 28bdc6f | 2006-09-20 15:59:59 +0200 | [diff] [blame] | 572 | sch->lpm = sch->schib.pmcw.pam & sch->opm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | |
| 574 | CIO_DEBUG(KERN_INFO, 0, |
Cornelia Huck | fb6958a | 2006-01-06 00:19:25 -0800 | [diff] [blame] | 575 | "Detected device %04x on subchannel 0.%x.%04X" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | " - PIM = %02X, PAM = %02X, POM = %02X\n", |
Cornelia Huck | fb6958a | 2006-01-06 00:19:25 -0800 | [diff] [blame] | 577 | sch->schib.pmcw.dev, sch->schid.ssid, |
| 578 | sch->schid.sch_no, sch->schib.pmcw.pim, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | sch->schib.pmcw.pam, sch->schib.pmcw.pom); |
| 580 | |
| 581 | /* |
| 582 | * We now have to initially ... |
| 583 | * ... set "interruption subclass" |
| 584 | * ... enable "concurrent sense" |
| 585 | * ... enable "multipath mode" if more than one |
| 586 | * CHPID is available. This is done regardless |
| 587 | * whether multiple paths are available for us. |
| 588 | */ |
| 589 | sch->schib.pmcw.isc = 3; /* could be smth. else */ |
| 590 | sch->schib.pmcw.csense = 1; /* concurrent sense */ |
| 591 | sch->schib.pmcw.ena = 0; |
| 592 | if ((sch->lpm & (sch->lpm - 1)) != 0) |
| 593 | sch->schib.pmcw.mp = 1; /* multipath mode */ |
| 594 | return 0; |
| 595 | } |
| 596 | |
| 597 | /* |
| 598 | * do_IRQ() handles all normal I/O device IRQ's (the special |
| 599 | * SMP cross-CPU interrupts have their own specific |
| 600 | * handlers). |
| 601 | * |
| 602 | */ |
| 603 | void |
| 604 | do_IRQ (struct pt_regs *regs) |
| 605 | { |
| 606 | struct tpi_info *tpi_info; |
| 607 | struct subchannel *sch; |
| 608 | struct irb *irb; |
| 609 | |
| 610 | irq_enter (); |
| 611 | asm volatile ("mc 0,0"); |
| 612 | if (S390_lowcore.int_clock >= S390_lowcore.jiffy_timer) |
| 613 | /** |
| 614 | * Make sure that the i/o interrupt did not "overtake" |
| 615 | * the last HZ timer interrupt. |
| 616 | */ |
| 617 | account_ticks(regs); |
| 618 | /* |
| 619 | * Get interrupt information from lowcore |
| 620 | */ |
| 621 | tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID; |
| 622 | irb = (struct irb *) __LC_IRB; |
| 623 | do { |
| 624 | kstat_cpu(smp_processor_id()).irqs[IO_INTERRUPT]++; |
| 625 | /* |
| 626 | * Non I/O-subchannel thin interrupts are processed differently |
| 627 | */ |
| 628 | if (tpi_info->adapter_IO == 1 && |
| 629 | tpi_info->int_type == IO_INTERRUPT_TYPE) { |
| 630 | do_adapter_IO(); |
| 631 | continue; |
| 632 | } |
| 633 | sch = (struct subchannel *)(unsigned long)tpi_info->intparm; |
| 634 | if (sch) |
| 635 | spin_lock(&sch->lock); |
| 636 | /* Store interrupt response block to lowcore. */ |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 637 | if (tsch (tpi_info->schid, irb) == 0 && sch) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | /* Keep subchannel information word up to date. */ |
| 639 | memcpy (&sch->schib.scsw, &irb->scsw, |
| 640 | sizeof (irb->scsw)); |
| 641 | /* Call interrupt handler if there is one. */ |
| 642 | if (sch->driver && sch->driver->irq) |
| 643 | sch->driver->irq(&sch->dev); |
| 644 | } |
| 645 | if (sch) |
| 646 | spin_unlock(&sch->lock); |
| 647 | /* |
| 648 | * Are more interrupts pending? |
| 649 | * If so, the tpi instruction will update the lowcore |
| 650 | * to hold the info for the next interrupt. |
| 651 | * We don't do this for VM because a tpi drops the cpu |
| 652 | * out of the sie which costs more cycles than it saves. |
| 653 | */ |
| 654 | } while (!MACHINE_IS_VM && tpi (NULL) != 0); |
| 655 | irq_exit (); |
| 656 | } |
| 657 | |
| 658 | #ifdef CONFIG_CCW_CONSOLE |
| 659 | static struct subchannel console_subchannel; |
| 660 | static int console_subchannel_in_use; |
| 661 | |
| 662 | /* |
| 663 | * busy wait for the next interrupt on the console |
| 664 | */ |
| 665 | void |
| 666 | wait_cons_dev (void) |
| 667 | { |
| 668 | unsigned long cr6 __attribute__ ((aligned (8))); |
| 669 | unsigned long save_cr6 __attribute__ ((aligned (8))); |
| 670 | |
| 671 | /* |
| 672 | * before entering the spinlock we may already have |
| 673 | * processed the interrupt on a different CPU... |
| 674 | */ |
| 675 | if (!console_subchannel_in_use) |
| 676 | return; |
| 677 | |
| 678 | /* disable all but isc 7 (console device) */ |
| 679 | __ctl_store (save_cr6, 6, 6); |
| 680 | cr6 = 0x01000000; |
| 681 | __ctl_load (cr6, 6, 6); |
| 682 | |
| 683 | do { |
| 684 | spin_unlock(&console_subchannel.lock); |
| 685 | if (!cio_tpi()) |
| 686 | cpu_relax(); |
| 687 | spin_lock(&console_subchannel.lock); |
| 688 | } while (console_subchannel.schib.scsw.actl != 0); |
| 689 | /* |
| 690 | * restore previous isc value |
| 691 | */ |
| 692 | __ctl_load (save_cr6, 6, 6); |
| 693 | } |
| 694 | |
| 695 | static int |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 696 | cio_test_for_console(struct subchannel_id schid, void *data) |
| 697 | { |
Cornelia Huck | fb6958a | 2006-01-06 00:19:25 -0800 | [diff] [blame] | 698 | if (stsch_err(schid, &console_subchannel.schib) != 0) |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 699 | return -ENXIO; |
| 700 | if (console_subchannel.schib.pmcw.dnv && |
| 701 | console_subchannel.schib.pmcw.dev == |
| 702 | console_devno) { |
| 703 | console_irq = schid.sch_no; |
| 704 | return 1; /* found */ |
| 705 | } |
| 706 | return 0; |
| 707 | } |
| 708 | |
| 709 | |
| 710 | static int |
| 711 | cio_get_console_sch_no(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | { |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 713 | struct subchannel_id schid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 715 | init_subchannel_id(&schid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | if (console_irq != -1) { |
| 717 | /* VM provided us with the irq number of the console. */ |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 718 | schid.sch_no = console_irq; |
| 719 | if (stsch(schid, &console_subchannel.schib) != 0 || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | !console_subchannel.schib.pmcw.dnv) |
| 721 | return -1; |
| 722 | console_devno = console_subchannel.schib.pmcw.dev; |
| 723 | } else if (console_devno != -1) { |
| 724 | /* At least the console device number is known. */ |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 725 | for_each_subchannel(cio_test_for_console, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | if (console_irq == -1) |
| 727 | return -1; |
| 728 | } else { |
| 729 | /* unlike in 2.4, we cannot autoprobe here, since |
| 730 | * the channel subsystem is not fully initialized. |
| 731 | * With some luck, the HWC console can take over */ |
| 732 | printk(KERN_WARNING "No ccw console found!\n"); |
| 733 | return -1; |
| 734 | } |
| 735 | return console_irq; |
| 736 | } |
| 737 | |
| 738 | struct subchannel * |
| 739 | cio_probe_console(void) |
| 740 | { |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 741 | int sch_no, ret; |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 742 | struct subchannel_id schid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | |
| 744 | if (xchg(&console_subchannel_in_use, 1) != 0) |
| 745 | return ERR_PTR(-EBUSY); |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 746 | sch_no = cio_get_console_sch_no(); |
| 747 | if (sch_no == -1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | console_subchannel_in_use = 0; |
| 749 | return ERR_PTR(-ENODEV); |
| 750 | } |
| 751 | memset(&console_subchannel, 0, sizeof(struct subchannel)); |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 752 | init_subchannel_id(&schid); |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 753 | schid.sch_no = sch_no; |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 754 | ret = cio_validate_subchannel(&console_subchannel, schid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | if (ret) { |
| 756 | console_subchannel_in_use = 0; |
| 757 | return ERR_PTR(-ENODEV); |
| 758 | } |
| 759 | |
| 760 | /* |
| 761 | * enable console I/O-interrupt subclass 7 |
| 762 | */ |
| 763 | ctl_set_bit(6, 24); |
| 764 | console_subchannel.schib.pmcw.isc = 7; |
| 765 | console_subchannel.schib.pmcw.intparm = |
| 766 | (__u32)(unsigned long)&console_subchannel; |
| 767 | ret = cio_modify(&console_subchannel); |
| 768 | if (ret) { |
| 769 | console_subchannel_in_use = 0; |
| 770 | return ERR_PTR(ret); |
| 771 | } |
| 772 | return &console_subchannel; |
| 773 | } |
| 774 | |
| 775 | void |
| 776 | cio_release_console(void) |
| 777 | { |
| 778 | console_subchannel.schib.pmcw.intparm = 0; |
| 779 | cio_modify(&console_subchannel); |
| 780 | ctl_clear_bit(6, 24); |
| 781 | console_subchannel_in_use = 0; |
| 782 | } |
| 783 | |
| 784 | /* Bah... hack to catch console special sausages. */ |
| 785 | int |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 786 | cio_is_console(struct subchannel_id schid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | { |
| 788 | if (!console_subchannel_in_use) |
| 789 | return 0; |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 790 | return schid_equal(&schid, &console_subchannel.schid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | } |
| 792 | |
| 793 | struct subchannel * |
| 794 | cio_get_console_subchannel(void) |
| 795 | { |
| 796 | if (!console_subchannel_in_use) |
Heiko Carstens | d2c993d | 2006-07-12 16:41:55 +0200 | [diff] [blame] | 797 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | return &console_subchannel; |
| 799 | } |
| 800 | |
| 801 | #endif |
| 802 | static inline int |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 803 | __disable_subchannel_easy(struct subchannel_id schid, struct schib *schib) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | { |
| 805 | int retry, cc; |
| 806 | |
| 807 | cc = 0; |
| 808 | for (retry=0;retry<3;retry++) { |
| 809 | schib->pmcw.ena = 0; |
| 810 | cc = msch(schid, schib); |
| 811 | if (cc) |
| 812 | return (cc==3?-ENODEV:-EBUSY); |
| 813 | stsch(schid, schib); |
| 814 | if (!schib->pmcw.ena) |
| 815 | return 0; |
| 816 | } |
| 817 | return -EBUSY; /* uhm... */ |
| 818 | } |
| 819 | |
| 820 | static inline int |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 821 | __clear_subchannel_easy(struct subchannel_id schid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | { |
| 823 | int retry; |
| 824 | |
| 825 | if (csch(schid)) |
| 826 | return -ENODEV; |
| 827 | for (retry=0;retry<20;retry++) { |
| 828 | struct tpi_info ti; |
| 829 | |
| 830 | if (tpi(&ti)) { |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 831 | tsch(ti.schid, (struct irb *)__LC_IRB); |
| 832 | if (schid_equal(&ti.schid, &schid)) |
Cornelia Huck | 4c24da7 | 2005-09-03 15:58:01 -0700 | [diff] [blame] | 833 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | } |
| 835 | udelay(100); |
| 836 | } |
| 837 | return -EBUSY; |
| 838 | } |
| 839 | |
Michael Holzheu | ff6b8ea | 2006-09-20 15:58:49 +0200 | [diff] [blame] | 840 | struct sch_match_id { |
| 841 | struct subchannel_id schid; |
| 842 | struct ccw_dev_id devid; |
| 843 | int rc; |
| 844 | }; |
| 845 | |
| 846 | static int __shutdown_subchannel_easy_and_match(struct subchannel_id schid, |
| 847 | void *data) |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 848 | { |
| 849 | struct schib schib; |
Michael Holzheu | ff6b8ea | 2006-09-20 15:58:49 +0200 | [diff] [blame] | 850 | struct sch_match_id *match_id = data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | |
Cornelia Huck | fb6958a | 2006-01-06 00:19:25 -0800 | [diff] [blame] | 852 | if (stsch_err(schid, &schib)) |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 853 | return -ENXIO; |
Michael Holzheu | ff6b8ea | 2006-09-20 15:58:49 +0200 | [diff] [blame] | 854 | if (match_id && schib.pmcw.dnv && |
| 855 | (schib.pmcw.dev == match_id->devid.devno) && |
| 856 | (schid.ssid == match_id->devid.ssid)) { |
| 857 | match_id->schid = schid; |
| 858 | match_id->rc = 0; |
| 859 | } |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 860 | if (!schib.pmcw.ena) |
| 861 | return 0; |
| 862 | switch(__disable_subchannel_easy(schid, &schib)) { |
| 863 | case 0: |
| 864 | case -ENODEV: |
| 865 | break; |
| 866 | default: /* -EBUSY */ |
| 867 | if (__clear_subchannel_easy(schid)) |
| 868 | break; /* give up... */ |
| 869 | stsch(schid, &schib); |
| 870 | __disable_subchannel_easy(schid, &schib); |
| 871 | } |
| 872 | return 0; |
| 873 | } |
| 874 | |
Michael Holzheu | ff6b8ea | 2006-09-20 15:58:49 +0200 | [diff] [blame] | 875 | static int clear_all_subchannels_and_match(struct ccw_dev_id *devid, |
| 876 | struct subchannel_id *schid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | { |
Michael Holzheu | ff6b8ea | 2006-09-20 15:58:49 +0200 | [diff] [blame] | 878 | struct sch_match_id match_id; |
| 879 | |
| 880 | match_id.devid = *devid; |
| 881 | match_id.rc = -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | local_irq_disable(); |
Michael Holzheu | ff6b8ea | 2006-09-20 15:58:49 +0200 | [diff] [blame] | 883 | for_each_subchannel(__shutdown_subchannel_easy_and_match, &match_id); |
| 884 | if (match_id.rc == 0) |
| 885 | *schid = match_id.schid; |
| 886 | return match_id.rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | } |
| 888 | |
Michael Holzheu | ff6b8ea | 2006-09-20 15:58:49 +0200 | [diff] [blame] | 889 | |
| 890 | void clear_all_subchannels(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | { |
Michael Holzheu | ff6b8ea | 2006-09-20 15:58:49 +0200 | [diff] [blame] | 892 | local_irq_disable(); |
| 893 | for_each_subchannel(__shutdown_subchannel_easy_and_match, NULL); |
| 894 | } |
| 895 | |
| 896 | extern void do_reipl_asm(__u32 schid); |
| 897 | |
| 898 | /* Make sure all subchannels are quiet before we re-ipl an lpar. */ |
| 899 | void reipl_ccw_dev(struct ccw_dev_id *devid) |
| 900 | { |
| 901 | struct subchannel_id schid; |
| 902 | |
| 903 | if (clear_all_subchannels_and_match(devid, &schid)) |
| 904 | panic("IPL Device not found\n"); |
Cornelia Huck | 7e56081 | 2006-07-12 16:40:19 +0200 | [diff] [blame] | 905 | cio_reset_channel_paths(); |
Michael Holzheu | ff6b8ea | 2006-09-20 15:58:49 +0200 | [diff] [blame] | 906 | do_reipl_asm(*((__u32*)&schid)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | } |
Heiko Carstens | e87bfe5 | 2006-09-20 15:59:15 +0200 | [diff] [blame] | 908 | |
| 909 | extern struct schib ipl_schib; |
| 910 | |
| 911 | /* |
| 912 | * ipl_save_parameters gets called very early. It is not allowed to access |
| 913 | * anything in the bss section at all. The bss section is not cleared yet, |
| 914 | * but may contain some ipl parameters written by the firmware. |
| 915 | * These parameters (if present) are copied to 0x2000. |
| 916 | * To avoid corruption of the ipl parameters, all variables used by this |
| 917 | * function must reside on the stack or in the data section. |
| 918 | */ |
| 919 | void ipl_save_parameters(void) |
| 920 | { |
| 921 | struct subchannel_id schid; |
| 922 | unsigned int *ipl_ptr; |
| 923 | void *src, *dst; |
| 924 | |
| 925 | schid = *(struct subchannel_id *)__LC_SUBCHANNEL_ID; |
| 926 | if (!schid.one) |
| 927 | return; |
| 928 | if (stsch(schid, &ipl_schib)) |
| 929 | return; |
| 930 | if (!ipl_schib.pmcw.dnv) |
| 931 | return; |
| 932 | ipl_devno = ipl_schib.pmcw.dev; |
| 933 | ipl_flags |= IPL_DEVNO_VALID; |
| 934 | if (!ipl_schib.pmcw.qf) |
| 935 | return; |
| 936 | ipl_flags |= IPL_PARMBLOCK_VALID; |
| 937 | ipl_ptr = (unsigned int *)__LC_IPL_PARMBLOCK_PTR; |
| 938 | src = (void *)(unsigned long)*ipl_ptr; |
| 939 | dst = (void *)IPL_PARMBLOCK_ORIGIN; |
| 940 | memmove(dst, src, PAGE_SIZE); |
| 941 | *ipl_ptr = IPL_PARMBLOCK_ORIGIN; |
| 942 | } |