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 | * |
Michael Holzheu | aa77015 | 2006-12-28 00:35:36 +0100 | [diff] [blame] | 5 | * Copyright (C) IBM Corp. 1999,2006 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | * Author(s): Ingo Adlung (adlung@de.ibm.com) |
Cornelia Huck | 4ce3b30 | 2006-01-14 13:21:04 -0800 | [diff] [blame] | 7 | * Cornelia Huck (cornelia.huck@de.ibm.com) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * Arnd Bergmann (arndb@de.ibm.com) |
| 9 | * Martin Schwidefsky (schwidefsky@de.ibm.com) |
| 10 | */ |
| 11 | |
| 12 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | #include <linux/init.h> |
| 14 | #include <linux/slab.h> |
| 15 | #include <linux/device.h> |
| 16 | #include <linux/kernel_stat.h> |
| 17 | #include <linux/interrupt.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <asm/cio.h> |
| 19 | #include <asm/delay.h> |
| 20 | #include <asm/irq.h> |
Heiko Carstens | 5a489b9 | 2006-10-06 16:38:35 +0200 | [diff] [blame] | 21 | #include <asm/irq_regs.h> |
Heiko Carstens | e87bfe5 | 2006-09-20 15:59:15 +0200 | [diff] [blame] | 22 | #include <asm/setup.h> |
Heiko Carstens | 15e9b58 | 2006-12-04 15:40:26 +0100 | [diff] [blame] | 23 | #include <asm/reset.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include "airq.h" |
| 25 | #include "cio.h" |
| 26 | #include "css.h" |
| 27 | #include "chsc.h" |
| 28 | #include "ioasm.h" |
| 29 | #include "blacklist.h" |
| 30 | #include "cio_debug.h" |
Heiko Carstens | 15e9b58 | 2006-12-04 15:40:26 +0100 | [diff] [blame] | 31 | #include "../s390mach.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
| 33 | debug_info_t *cio_debug_msg_id; |
| 34 | debug_info_t *cio_debug_trace_id; |
| 35 | debug_info_t *cio_debug_crw_id; |
| 36 | |
| 37 | int cio_show_msg; |
| 38 | |
| 39 | static int __init |
| 40 | cio_setup (char *parm) |
| 41 | { |
| 42 | if (!strcmp (parm, "yes")) |
| 43 | cio_show_msg = 1; |
| 44 | else if (!strcmp (parm, "no")) |
| 45 | cio_show_msg = 0; |
| 46 | else |
| 47 | printk (KERN_ERR "cio_setup : invalid cio_msg parameter '%s'", |
| 48 | parm); |
| 49 | return 1; |
| 50 | } |
| 51 | |
| 52 | __setup ("cio_msg=", cio_setup); |
| 53 | |
| 54 | /* |
| 55 | * Function: cio_debug_init |
| 56 | * Initializes three debug logs (under /proc/s390dbf) for common I/O: |
| 57 | * - cio_msg logs the messages which are printk'ed when CONFIG_DEBUG_IO is on |
| 58 | * - cio_trace logs the calling of different functions |
| 59 | * - cio_crw logs the messages which are printk'ed when CONFIG_DEBUG_CRW is on |
| 60 | * debug levels depend on CONFIG_DEBUG_IO resp. CONFIG_DEBUG_CRW |
| 61 | */ |
| 62 | static int __init |
| 63 | cio_debug_init (void) |
| 64 | { |
Michael Holzheu | 66a464d | 2005-06-25 14:55:33 -0700 | [diff] [blame] | 65 | 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] | 66 | if (!cio_debug_msg_id) |
| 67 | goto out_unregister; |
| 68 | debug_register_view (cio_debug_msg_id, &debug_sprintf_view); |
| 69 | debug_set_level (cio_debug_msg_id, 2); |
Peter Oberparleiter | 06fbcb1 | 2006-04-10 22:53:46 -0700 | [diff] [blame] | 70 | cio_debug_trace_id = debug_register ("cio_trace", 16, 4, 16); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | if (!cio_debug_trace_id) |
| 72 | goto out_unregister; |
| 73 | debug_register_view (cio_debug_trace_id, &debug_hex_ascii_view); |
| 74 | debug_set_level (cio_debug_trace_id, 2); |
Michael Holzheu | 66a464d | 2005-06-25 14:55:33 -0700 | [diff] [blame] | 75 | 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] | 76 | if (!cio_debug_crw_id) |
| 77 | goto out_unregister; |
| 78 | debug_register_view (cio_debug_crw_id, &debug_sprintf_view); |
| 79 | debug_set_level (cio_debug_crw_id, 2); |
| 80 | pr_debug("debugging initialized\n"); |
| 81 | return 0; |
| 82 | |
| 83 | out_unregister: |
| 84 | if (cio_debug_msg_id) |
| 85 | debug_unregister (cio_debug_msg_id); |
| 86 | if (cio_debug_trace_id) |
| 87 | debug_unregister (cio_debug_trace_id); |
| 88 | if (cio_debug_crw_id) |
| 89 | debug_unregister (cio_debug_crw_id); |
| 90 | pr_debug("could not initialize debugging\n"); |
| 91 | return -1; |
| 92 | } |
| 93 | |
| 94 | arch_initcall (cio_debug_init); |
| 95 | |
| 96 | int |
| 97 | cio_set_options (struct subchannel *sch, int flags) |
| 98 | { |
| 99 | sch->options.suspend = (flags & DOIO_ALLOW_SUSPEND) != 0; |
| 100 | sch->options.prefetch = (flags & DOIO_DENY_PREFETCH) != 0; |
| 101 | sch->options.inter = (flags & DOIO_SUPPRESS_INTER) != 0; |
| 102 | return 0; |
| 103 | } |
| 104 | |
| 105 | /* FIXME: who wants to use this? */ |
| 106 | int |
| 107 | cio_get_options (struct subchannel *sch) |
| 108 | { |
| 109 | int flags; |
| 110 | |
| 111 | flags = 0; |
| 112 | if (sch->options.suspend) |
| 113 | flags |= DOIO_ALLOW_SUSPEND; |
| 114 | if (sch->options.prefetch) |
| 115 | flags |= DOIO_DENY_PREFETCH; |
| 116 | if (sch->options.inter) |
| 117 | flags |= DOIO_SUPPRESS_INTER; |
| 118 | return flags; |
| 119 | } |
| 120 | |
| 121 | /* |
| 122 | * Use tpi to get a pending interrupt, call the interrupt handler and |
| 123 | * return a pointer to the subchannel structure. |
| 124 | */ |
| 125 | static inline int |
| 126 | cio_tpi(void) |
| 127 | { |
| 128 | struct tpi_info *tpi_info; |
| 129 | struct subchannel *sch; |
| 130 | struct irb *irb; |
| 131 | |
| 132 | tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID; |
| 133 | if (tpi (NULL) != 1) |
| 134 | return 0; |
| 135 | irb = (struct irb *) __LC_IRB; |
| 136 | /* Store interrupt response block to lowcore. */ |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 137 | if (tsch (tpi_info->schid, irb) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | /* Not status pending or not operational. */ |
| 139 | return 1; |
| 140 | sch = (struct subchannel *)(unsigned long)tpi_info->intparm; |
| 141 | if (!sch) |
| 142 | return 1; |
| 143 | local_bh_disable(); |
| 144 | irq_enter (); |
Cornelia Huck | 2ec2298 | 2006-12-08 15:54:26 +0100 | [diff] [blame] | 145 | spin_lock(sch->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | memcpy (&sch->schib.scsw, &irb->scsw, sizeof (struct scsw)); |
| 147 | if (sch->driver && sch->driver->irq) |
| 148 | sch->driver->irq(&sch->dev); |
Cornelia Huck | 2ec2298 | 2006-12-08 15:54:26 +0100 | [diff] [blame] | 149 | spin_unlock(sch->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | irq_exit (); |
Heiko Carstens | 1f194a4 | 2006-07-03 00:24:46 -0700 | [diff] [blame] | 151 | _local_bh_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | return 1; |
| 153 | } |
| 154 | |
| 155 | static inline int |
| 156 | cio_start_handle_notoper(struct subchannel *sch, __u8 lpm) |
| 157 | { |
| 158 | char dbf_text[15]; |
| 159 | |
| 160 | if (lpm != 0) |
| 161 | sch->lpm &= ~lpm; |
| 162 | else |
| 163 | sch->lpm = 0; |
| 164 | |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 165 | stsch (sch->schid, &sch->schib); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | |
| 167 | CIO_MSG_EVENT(0, "cio_start: 'not oper' status for " |
Cornelia Huck | fb6958a | 2006-01-06 00:19:25 -0800 | [diff] [blame] | 168 | "subchannel 0.%x.%04x!\n", sch->schid.ssid, |
| 169 | sch->schid.sch_no); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Peter Oberparleiter | e0e32c8 | 2006-09-20 15:59:57 +0200 | [diff] [blame] | 196 | sch->orb.lpm = (lpm != 0) ? lpm : sch->lpm; |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 197 | #ifdef CONFIG_64BIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 207 | ccode = ssch (sch->schid, &sch->orb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 246 | ccode = rsch (sch->schid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 286 | ccode = hsch (sch->schid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 321 | ccode = csch (sch->schid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 354 | ccode = xsch (sch->schid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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. */ |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 362 | stsch (sch->schid, &sch->schib); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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++) { |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 384 | ccode = msch_err (sch->schid, &sch->schib); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Cornelia Huck | d7b5a4c9 | 2006-12-08 15:54:28 +0100 | [diff] [blame] | 417 | if (sch_is_pseudo_sch(sch)) |
| 418 | return -EINVAL; |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 419 | ccode = stsch (sch->schid, &sch->schib); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | if (ccode) |
| 421 | return -ENODEV; |
| 422 | |
| 423 | for (retry = 5, ret = 0; retry > 0; retry--) { |
| 424 | sch->schib.pmcw.ena = 1; |
| 425 | sch->schib.pmcw.isc = isc; |
| 426 | sch->schib.pmcw.intparm = (__u32)(unsigned long)sch; |
| 427 | ret = cio_modify(sch); |
| 428 | if (ret == -ENODEV) |
| 429 | break; |
| 430 | if (ret == -EIO) |
| 431 | /* |
| 432 | * Got a program check in cio_modify. Try without |
| 433 | * the concurrent sense bit the next time. |
| 434 | */ |
| 435 | sch->schib.pmcw.csense = 0; |
| 436 | if (ret == 0) { |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 437 | stsch (sch->schid, &sch->schib); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | if (sch->schib.pmcw.ena) |
| 439 | break; |
| 440 | } |
| 441 | if (ret == -EBUSY) { |
| 442 | struct irb irb; |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 443 | if (tsch(sch->schid, &irb) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | break; |
| 445 | } |
| 446 | } |
| 447 | sprintf (dbf_txt, "ret:%d", ret); |
| 448 | CIO_TRACE_EVENT (2, dbf_txt); |
| 449 | return ret; |
| 450 | } |
| 451 | |
| 452 | /* |
| 453 | * Disable subchannel. |
| 454 | */ |
| 455 | int |
| 456 | cio_disable_subchannel (struct subchannel *sch) |
| 457 | { |
| 458 | char dbf_txt[15]; |
| 459 | int ccode; |
| 460 | int retry; |
| 461 | int ret; |
| 462 | |
| 463 | CIO_TRACE_EVENT (2, "dissch"); |
| 464 | CIO_TRACE_EVENT (2, sch->dev.bus_id); |
| 465 | |
Cornelia Huck | d7b5a4c9 | 2006-12-08 15:54:28 +0100 | [diff] [blame] | 466 | if (sch_is_pseudo_sch(sch)) |
| 467 | return 0; |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 468 | ccode = stsch (sch->schid, &sch->schib); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | if (ccode == 3) /* Not operational. */ |
| 470 | return -ENODEV; |
| 471 | |
| 472 | if (sch->schib.scsw.actl != 0) |
| 473 | /* |
| 474 | * the disable function must not be called while there are |
| 475 | * requests pending for completion ! |
| 476 | */ |
| 477 | return -EBUSY; |
| 478 | |
| 479 | for (retry = 5, ret = 0; retry > 0; retry--) { |
| 480 | sch->schib.pmcw.ena = 0; |
| 481 | ret = cio_modify(sch); |
| 482 | if (ret == -ENODEV) |
| 483 | break; |
| 484 | if (ret == -EBUSY) |
| 485 | /* |
| 486 | * The subchannel is busy or status pending. |
| 487 | * We'll disable when the next interrupt was delivered |
| 488 | * via the state machine. |
| 489 | */ |
| 490 | break; |
| 491 | if (ret == 0) { |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 492 | stsch (sch->schid, &sch->schib); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | if (!sch->schib.pmcw.ena) |
| 494 | break; |
| 495 | } |
| 496 | } |
| 497 | sprintf (dbf_txt, "ret:%d", ret); |
| 498 | CIO_TRACE_EVENT (2, dbf_txt); |
| 499 | return ret; |
| 500 | } |
| 501 | |
Cornelia Huck | d7b5a4c9 | 2006-12-08 15:54:28 +0100 | [diff] [blame] | 502 | int cio_create_sch_lock(struct subchannel *sch) |
Cornelia Huck | 2ec2298 | 2006-12-08 15:54:26 +0100 | [diff] [blame] | 503 | { |
| 504 | sch->lock = kmalloc(sizeof(spinlock_t), GFP_KERNEL); |
| 505 | if (!sch->lock) |
| 506 | return -ENOMEM; |
| 507 | spin_lock_init(sch->lock); |
| 508 | return 0; |
| 509 | } |
| 510 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | /* |
| 512 | * cio_validate_subchannel() |
| 513 | * |
| 514 | * Find out subchannel type and initialize struct subchannel. |
| 515 | * Return codes: |
| 516 | * SUBCHANNEL_TYPE_IO for a normal io subchannel |
| 517 | * SUBCHANNEL_TYPE_CHSC for a chsc subchannel |
| 518 | * SUBCHANNEL_TYPE_MESSAGE for a messaging subchannel |
| 519 | * SUBCHANNEL_TYPE_ADM for a adm(?) subchannel |
| 520 | * -ENXIO for non-defined subchannels |
| 521 | * -ENODEV for subchannels with invalid device number or blacklisted devices |
| 522 | */ |
| 523 | int |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 524 | cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | { |
| 526 | char dbf_txt[15]; |
| 527 | int ccode; |
Cornelia Huck | 2ec2298 | 2006-12-08 15:54:26 +0100 | [diff] [blame] | 528 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 530 | sprintf (dbf_txt, "valsch%x", schid.sch_no); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | CIO_TRACE_EVENT (4, dbf_txt); |
| 532 | |
| 533 | /* Nuke all fields. */ |
| 534 | memset(sch, 0, sizeof(struct subchannel)); |
| 535 | |
Cornelia Huck | 2ec2298 | 2006-12-08 15:54:26 +0100 | [diff] [blame] | 536 | sch->schid = schid; |
| 537 | if (cio_is_console(schid)) { |
| 538 | sch->lock = cio_get_console_lock(); |
| 539 | } else { |
| 540 | err = cio_create_sch_lock(sch); |
| 541 | if (err) |
| 542 | goto out; |
| 543 | } |
Cornelia Huck | 6ab4879 | 2006-07-12 16:39:50 +0200 | [diff] [blame] | 544 | mutex_init(&sch->reg_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | /* Set a name for the subchannel */ |
Cornelia Huck | fb6958a | 2006-01-06 00:19:25 -0800 | [diff] [blame] | 546 | snprintf (sch->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x", schid.ssid, |
| 547 | schid.sch_no); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | |
| 549 | /* |
| 550 | * The first subchannel that is not-operational (ccode==3) |
| 551 | * indicates that there aren't any more devices available. |
Cornelia Huck | fb6958a | 2006-01-06 00:19:25 -0800 | [diff] [blame] | 552 | * If stsch gets an exception, it means the current subchannel set |
| 553 | * is not valid. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | */ |
Cornelia Huck | fb6958a | 2006-01-06 00:19:25 -0800 | [diff] [blame] | 555 | ccode = stsch_err (schid, &sch->schib); |
Cornelia Huck | 2ec2298 | 2006-12-08 15:54:26 +0100 | [diff] [blame] | 556 | if (ccode) { |
| 557 | err = (ccode == 3) ? -ENXIO : ccode; |
| 558 | goto out; |
| 559 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | /* Copy subchannel type from path management control word. */ |
| 561 | sch->st = sch->schib.pmcw.st; |
| 562 | |
| 563 | /* |
| 564 | * ... just being curious we check for non I/O subchannels |
| 565 | */ |
| 566 | if (sch->st != 0) { |
| 567 | CIO_DEBUG(KERN_INFO, 0, |
Cornelia Huck | fb6958a | 2006-01-06 00:19:25 -0800 | [diff] [blame] | 568 | "Subchannel 0.%x.%04x reports " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | "non-I/O subchannel type %04X\n", |
Cornelia Huck | fb6958a | 2006-01-06 00:19:25 -0800 | [diff] [blame] | 570 | sch->schid.ssid, sch->schid.sch_no, sch->st); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | /* We stop here for non-io subchannels. */ |
Cornelia Huck | 2ec2298 | 2006-12-08 15:54:26 +0100 | [diff] [blame] | 572 | err = sch->st; |
| 573 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | } |
| 575 | |
| 576 | /* Initialization for io subchannels. */ |
Cornelia Huck | 2ec2298 | 2006-12-08 15:54:26 +0100 | [diff] [blame] | 577 | if (!sch->schib.pmcw.dnv) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | /* io subchannel but device number is invalid. */ |
Cornelia Huck | 2ec2298 | 2006-12-08 15:54:26 +0100 | [diff] [blame] | 579 | err = -ENODEV; |
| 580 | goto out; |
| 581 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | /* Devno is valid. */ |
Cornelia Huck | fb6958a | 2006-01-06 00:19:25 -0800 | [diff] [blame] | 583 | if (is_blacklisted (sch->schid.ssid, sch->schib.pmcw.dev)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | /* |
| 585 | * This device must not be known to Linux. So we simply |
| 586 | * say that there is no device and return ENODEV. |
| 587 | */ |
Cornelia Huck | 347d59d | 2007-02-05 21:17:56 +0100 | [diff] [blame^] | 588 | CIO_MSG_EVENT(4, "Blacklisted device detected " |
Cornelia Huck | fb6958a | 2006-01-06 00:19:25 -0800 | [diff] [blame] | 589 | "at devno %04X, subchannel set %x\n", |
| 590 | sch->schib.pmcw.dev, sch->schid.ssid); |
Cornelia Huck | 2ec2298 | 2006-12-08 15:54:26 +0100 | [diff] [blame] | 591 | err = -ENODEV; |
| 592 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | } |
| 594 | sch->opm = 0xff; |
Cornelia Huck | fb6958a | 2006-01-06 00:19:25 -0800 | [diff] [blame] | 595 | if (!cio_is_console(sch->schid)) |
| 596 | chsc_validate_chpids(sch); |
Peter Oberparleiter | 28bdc6f | 2006-09-20 15:59:59 +0200 | [diff] [blame] | 597 | sch->lpm = sch->schib.pmcw.pam & sch->opm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | |
| 599 | CIO_DEBUG(KERN_INFO, 0, |
Cornelia Huck | fb6958a | 2006-01-06 00:19:25 -0800 | [diff] [blame] | 600 | "Detected device %04x on subchannel 0.%x.%04X" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | " - PIM = %02X, PAM = %02X, POM = %02X\n", |
Cornelia Huck | fb6958a | 2006-01-06 00:19:25 -0800 | [diff] [blame] | 602 | sch->schib.pmcw.dev, sch->schid.ssid, |
| 603 | sch->schid.sch_no, sch->schib.pmcw.pim, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | sch->schib.pmcw.pam, sch->schib.pmcw.pom); |
| 605 | |
| 606 | /* |
| 607 | * We now have to initially ... |
| 608 | * ... set "interruption subclass" |
| 609 | * ... enable "concurrent sense" |
| 610 | * ... enable "multipath mode" if more than one |
| 611 | * CHPID is available. This is done regardless |
| 612 | * whether multiple paths are available for us. |
| 613 | */ |
| 614 | sch->schib.pmcw.isc = 3; /* could be smth. else */ |
| 615 | sch->schib.pmcw.csense = 1; /* concurrent sense */ |
| 616 | sch->schib.pmcw.ena = 0; |
| 617 | if ((sch->lpm & (sch->lpm - 1)) != 0) |
| 618 | sch->schib.pmcw.mp = 1; /* multipath mode */ |
| 619 | return 0; |
Cornelia Huck | 2ec2298 | 2006-12-08 15:54:26 +0100 | [diff] [blame] | 620 | out: |
| 621 | if (!cio_is_console(schid)) |
| 622 | kfree(sch->lock); |
| 623 | sch->lock = NULL; |
| 624 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | } |
| 626 | |
| 627 | /* |
| 628 | * do_IRQ() handles all normal I/O device IRQ's (the special |
| 629 | * SMP cross-CPU interrupts have their own specific |
| 630 | * handlers). |
| 631 | * |
| 632 | */ |
| 633 | void |
| 634 | do_IRQ (struct pt_regs *regs) |
| 635 | { |
| 636 | struct tpi_info *tpi_info; |
| 637 | struct subchannel *sch; |
| 638 | struct irb *irb; |
Heiko Carstens | 5a489b9 | 2006-10-06 16:38:35 +0200 | [diff] [blame] | 639 | struct pt_regs *old_regs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | |
Heiko Carstens | 5a489b9 | 2006-10-06 16:38:35 +0200 | [diff] [blame] | 641 | old_regs = set_irq_regs(regs); |
Heiko Carstens | 9d0a57c | 2006-10-11 15:31:26 +0200 | [diff] [blame] | 642 | irq_enter(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | asm volatile ("mc 0,0"); |
| 644 | if (S390_lowcore.int_clock >= S390_lowcore.jiffy_timer) |
| 645 | /** |
| 646 | * Make sure that the i/o interrupt did not "overtake" |
| 647 | * the last HZ timer interrupt. |
| 648 | */ |
Heiko Carstens | 5a489b9 | 2006-10-06 16:38:35 +0200 | [diff] [blame] | 649 | account_ticks(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | /* |
| 651 | * Get interrupt information from lowcore |
| 652 | */ |
| 653 | tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID; |
| 654 | irb = (struct irb *) __LC_IRB; |
| 655 | do { |
| 656 | kstat_cpu(smp_processor_id()).irqs[IO_INTERRUPT]++; |
| 657 | /* |
| 658 | * Non I/O-subchannel thin interrupts are processed differently |
| 659 | */ |
| 660 | if (tpi_info->adapter_IO == 1 && |
| 661 | tpi_info->int_type == IO_INTERRUPT_TYPE) { |
| 662 | do_adapter_IO(); |
| 663 | continue; |
| 664 | } |
| 665 | sch = (struct subchannel *)(unsigned long)tpi_info->intparm; |
| 666 | if (sch) |
Cornelia Huck | 2ec2298 | 2006-12-08 15:54:26 +0100 | [diff] [blame] | 667 | spin_lock(sch->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | /* Store interrupt response block to lowcore. */ |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 669 | if (tsch (tpi_info->schid, irb) == 0 && sch) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | /* Keep subchannel information word up to date. */ |
| 671 | memcpy (&sch->schib.scsw, &irb->scsw, |
| 672 | sizeof (irb->scsw)); |
| 673 | /* Call interrupt handler if there is one. */ |
| 674 | if (sch->driver && sch->driver->irq) |
| 675 | sch->driver->irq(&sch->dev); |
| 676 | } |
| 677 | if (sch) |
Cornelia Huck | 2ec2298 | 2006-12-08 15:54:26 +0100 | [diff] [blame] | 678 | spin_unlock(sch->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | /* |
| 680 | * Are more interrupts pending? |
| 681 | * If so, the tpi instruction will update the lowcore |
| 682 | * to hold the info for the next interrupt. |
| 683 | * We don't do this for VM because a tpi drops the cpu |
| 684 | * out of the sie which costs more cycles than it saves. |
| 685 | */ |
| 686 | } while (!MACHINE_IS_VM && tpi (NULL) != 0); |
Heiko Carstens | 9d0a57c | 2006-10-11 15:31:26 +0200 | [diff] [blame] | 687 | irq_exit(); |
Heiko Carstens | 5a489b9 | 2006-10-06 16:38:35 +0200 | [diff] [blame] | 688 | set_irq_regs(old_regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | } |
| 690 | |
| 691 | #ifdef CONFIG_CCW_CONSOLE |
| 692 | static struct subchannel console_subchannel; |
| 693 | static int console_subchannel_in_use; |
| 694 | |
| 695 | /* |
| 696 | * busy wait for the next interrupt on the console |
| 697 | */ |
| 698 | void |
| 699 | wait_cons_dev (void) |
| 700 | { |
| 701 | unsigned long cr6 __attribute__ ((aligned (8))); |
| 702 | unsigned long save_cr6 __attribute__ ((aligned (8))); |
| 703 | |
| 704 | /* |
| 705 | * before entering the spinlock we may already have |
| 706 | * processed the interrupt on a different CPU... |
| 707 | */ |
| 708 | if (!console_subchannel_in_use) |
| 709 | return; |
| 710 | |
| 711 | /* disable all but isc 7 (console device) */ |
| 712 | __ctl_store (save_cr6, 6, 6); |
| 713 | cr6 = 0x01000000; |
| 714 | __ctl_load (cr6, 6, 6); |
| 715 | |
| 716 | do { |
Cornelia Huck | 2ec2298 | 2006-12-08 15:54:26 +0100 | [diff] [blame] | 717 | spin_unlock(console_subchannel.lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | if (!cio_tpi()) |
| 719 | cpu_relax(); |
Cornelia Huck | 2ec2298 | 2006-12-08 15:54:26 +0100 | [diff] [blame] | 720 | spin_lock(console_subchannel.lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | } while (console_subchannel.schib.scsw.actl != 0); |
| 722 | /* |
| 723 | * restore previous isc value |
| 724 | */ |
| 725 | __ctl_load (save_cr6, 6, 6); |
| 726 | } |
| 727 | |
| 728 | static int |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 729 | cio_test_for_console(struct subchannel_id schid, void *data) |
| 730 | { |
Cornelia Huck | fb6958a | 2006-01-06 00:19:25 -0800 | [diff] [blame] | 731 | if (stsch_err(schid, &console_subchannel.schib) != 0) |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 732 | return -ENXIO; |
| 733 | if (console_subchannel.schib.pmcw.dnv && |
| 734 | console_subchannel.schib.pmcw.dev == |
| 735 | console_devno) { |
| 736 | console_irq = schid.sch_no; |
| 737 | return 1; /* found */ |
| 738 | } |
| 739 | return 0; |
| 740 | } |
| 741 | |
| 742 | |
| 743 | static int |
| 744 | cio_get_console_sch_no(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | { |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 746 | struct subchannel_id schid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 748 | init_subchannel_id(&schid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | if (console_irq != -1) { |
| 750 | /* VM provided us with the irq number of the console. */ |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 751 | schid.sch_no = console_irq; |
| 752 | if (stsch(schid, &console_subchannel.schib) != 0 || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | !console_subchannel.schib.pmcw.dnv) |
| 754 | return -1; |
| 755 | console_devno = console_subchannel.schib.pmcw.dev; |
| 756 | } else if (console_devno != -1) { |
| 757 | /* At least the console device number is known. */ |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 758 | for_each_subchannel(cio_test_for_console, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | if (console_irq == -1) |
| 760 | return -1; |
| 761 | } else { |
| 762 | /* unlike in 2.4, we cannot autoprobe here, since |
| 763 | * the channel subsystem is not fully initialized. |
| 764 | * With some luck, the HWC console can take over */ |
| 765 | printk(KERN_WARNING "No ccw console found!\n"); |
| 766 | return -1; |
| 767 | } |
| 768 | return console_irq; |
| 769 | } |
| 770 | |
| 771 | struct subchannel * |
| 772 | cio_probe_console(void) |
| 773 | { |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 774 | int sch_no, ret; |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 775 | struct subchannel_id schid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | |
| 777 | if (xchg(&console_subchannel_in_use, 1) != 0) |
| 778 | return ERR_PTR(-EBUSY); |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 779 | sch_no = cio_get_console_sch_no(); |
| 780 | if (sch_no == -1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | console_subchannel_in_use = 0; |
| 782 | return ERR_PTR(-ENODEV); |
| 783 | } |
| 784 | memset(&console_subchannel, 0, sizeof(struct subchannel)); |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 785 | init_subchannel_id(&schid); |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 786 | schid.sch_no = sch_no; |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 787 | ret = cio_validate_subchannel(&console_subchannel, schid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | if (ret) { |
| 789 | console_subchannel_in_use = 0; |
| 790 | return ERR_PTR(-ENODEV); |
| 791 | } |
| 792 | |
| 793 | /* |
| 794 | * enable console I/O-interrupt subclass 7 |
| 795 | */ |
| 796 | ctl_set_bit(6, 24); |
| 797 | console_subchannel.schib.pmcw.isc = 7; |
| 798 | console_subchannel.schib.pmcw.intparm = |
| 799 | (__u32)(unsigned long)&console_subchannel; |
| 800 | ret = cio_modify(&console_subchannel); |
| 801 | if (ret) { |
| 802 | console_subchannel_in_use = 0; |
| 803 | return ERR_PTR(ret); |
| 804 | } |
| 805 | return &console_subchannel; |
| 806 | } |
| 807 | |
| 808 | void |
| 809 | cio_release_console(void) |
| 810 | { |
| 811 | console_subchannel.schib.pmcw.intparm = 0; |
| 812 | cio_modify(&console_subchannel); |
| 813 | ctl_clear_bit(6, 24); |
| 814 | console_subchannel_in_use = 0; |
| 815 | } |
| 816 | |
| 817 | /* Bah... hack to catch console special sausages. */ |
| 818 | int |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 819 | cio_is_console(struct subchannel_id schid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | { |
| 821 | if (!console_subchannel_in_use) |
| 822 | return 0; |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 823 | return schid_equal(&schid, &console_subchannel.schid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | } |
| 825 | |
| 826 | struct subchannel * |
| 827 | cio_get_console_subchannel(void) |
| 828 | { |
| 829 | if (!console_subchannel_in_use) |
Heiko Carstens | d2c993d | 2006-07-12 16:41:55 +0200 | [diff] [blame] | 830 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | return &console_subchannel; |
| 832 | } |
| 833 | |
| 834 | #endif |
| 835 | static inline int |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 836 | __disable_subchannel_easy(struct subchannel_id schid, struct schib *schib) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | { |
| 838 | int retry, cc; |
| 839 | |
| 840 | cc = 0; |
| 841 | for (retry=0;retry<3;retry++) { |
| 842 | schib->pmcw.ena = 0; |
| 843 | cc = msch(schid, schib); |
| 844 | if (cc) |
| 845 | return (cc==3?-ENODEV:-EBUSY); |
| 846 | stsch(schid, schib); |
| 847 | if (!schib->pmcw.ena) |
| 848 | return 0; |
| 849 | } |
| 850 | return -EBUSY; /* uhm... */ |
| 851 | } |
| 852 | |
| 853 | static inline int |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 854 | __clear_subchannel_easy(struct subchannel_id schid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | { |
| 856 | int retry; |
| 857 | |
| 858 | if (csch(schid)) |
| 859 | return -ENODEV; |
| 860 | for (retry=0;retry<20;retry++) { |
| 861 | struct tpi_info ti; |
| 862 | |
| 863 | if (tpi(&ti)) { |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 864 | tsch(ti.schid, (struct irb *)__LC_IRB); |
| 865 | if (schid_equal(&ti.schid, &schid)) |
Cornelia Huck | 4c24da7 | 2005-09-03 15:58:01 -0700 | [diff] [blame] | 866 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | } |
| 868 | udelay(100); |
| 869 | } |
| 870 | return -EBUSY; |
| 871 | } |
| 872 | |
Michael Holzheu | a45e141 | 2006-12-15 17:18:22 +0100 | [diff] [blame] | 873 | static int pgm_check_occured; |
| 874 | |
| 875 | static void cio_reset_pgm_check_handler(void) |
| 876 | { |
| 877 | pgm_check_occured = 1; |
| 878 | } |
| 879 | |
| 880 | static int stsch_reset(struct subchannel_id schid, volatile struct schib *addr) |
| 881 | { |
| 882 | int rc; |
| 883 | |
| 884 | pgm_check_occured = 0; |
| 885 | s390_reset_pgm_handler = cio_reset_pgm_check_handler; |
Heiko Carstens | 6faf444 | 2007-01-09 10:18:41 +0100 | [diff] [blame] | 886 | rc = stsch(schid, addr); |
Michael Holzheu | a45e141 | 2006-12-15 17:18:22 +0100 | [diff] [blame] | 887 | s390_reset_pgm_handler = NULL; |
Heiko Carstens | 6faf444 | 2007-01-09 10:18:41 +0100 | [diff] [blame] | 888 | |
| 889 | /* The program check handler could have changed pgm_check_occured */ |
| 890 | barrier(); |
| 891 | |
Michael Holzheu | a45e141 | 2006-12-15 17:18:22 +0100 | [diff] [blame] | 892 | if (pgm_check_occured) |
| 893 | return -EIO; |
| 894 | else |
| 895 | return rc; |
| 896 | } |
| 897 | |
Heiko Carstens | 15e9b58 | 2006-12-04 15:40:26 +0100 | [diff] [blame] | 898 | static int __shutdown_subchannel_easy(struct subchannel_id schid, void *data) |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 899 | { |
| 900 | struct schib schib; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | |
Michael Holzheu | a45e141 | 2006-12-15 17:18:22 +0100 | [diff] [blame] | 902 | if (stsch_reset(schid, &schib)) |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 903 | return -ENXIO; |
| 904 | if (!schib.pmcw.ena) |
| 905 | return 0; |
| 906 | switch(__disable_subchannel_easy(schid, &schib)) { |
| 907 | case 0: |
| 908 | case -ENODEV: |
| 909 | break; |
| 910 | default: /* -EBUSY */ |
| 911 | if (__clear_subchannel_easy(schid)) |
| 912 | break; /* give up... */ |
| 913 | stsch(schid, &schib); |
| 914 | __disable_subchannel_easy(schid, &schib); |
| 915 | } |
| 916 | return 0; |
| 917 | } |
| 918 | |
Heiko Carstens | 15e9b58 | 2006-12-04 15:40:26 +0100 | [diff] [blame] | 919 | static atomic_t chpid_reset_count; |
| 920 | |
| 921 | static void s390_reset_chpids_mcck_handler(void) |
| 922 | { |
| 923 | struct crw crw; |
| 924 | struct mci *mci; |
| 925 | |
| 926 | /* Check for pending channel report word. */ |
| 927 | mci = (struct mci *)&S390_lowcore.mcck_interruption_code; |
| 928 | if (!mci->cp) |
| 929 | return; |
| 930 | /* Process channel report words. */ |
| 931 | while (stcrw(&crw) == 0) { |
| 932 | /* Check for responses to RCHP. */ |
| 933 | if (crw.slct && crw.rsc == CRW_RSC_CPATH) |
| 934 | atomic_dec(&chpid_reset_count); |
| 935 | } |
| 936 | } |
| 937 | |
| 938 | #define RCHP_TIMEOUT (30 * USEC_PER_SEC) |
| 939 | static void css_reset(void) |
| 940 | { |
| 941 | int i, ret; |
| 942 | unsigned long long timeout; |
| 943 | |
| 944 | /* Reset subchannels. */ |
| 945 | for_each_subchannel(__shutdown_subchannel_easy, NULL); |
| 946 | /* Reset channel paths. */ |
| 947 | s390_reset_mcck_handler = s390_reset_chpids_mcck_handler; |
| 948 | /* Enable channel report machine checks. */ |
| 949 | __ctl_set_bit(14, 28); |
| 950 | /* Temporarily reenable machine checks. */ |
| 951 | local_mcck_enable(); |
| 952 | for (i = 0; i <= __MAX_CHPID; i++) { |
| 953 | ret = rchp(i); |
| 954 | if ((ret == 0) || (ret == 2)) |
| 955 | /* |
| 956 | * rchp either succeeded, or another rchp is already |
| 957 | * in progress. In either case, we'll get a crw. |
| 958 | */ |
| 959 | atomic_inc(&chpid_reset_count); |
| 960 | } |
| 961 | /* Wait for machine check for all channel paths. */ |
| 962 | timeout = get_clock() + (RCHP_TIMEOUT << 12); |
| 963 | while (atomic_read(&chpid_reset_count) != 0) { |
| 964 | if (get_clock() > timeout) |
| 965 | break; |
| 966 | cpu_relax(); |
| 967 | } |
| 968 | /* Disable machine checks again. */ |
| 969 | local_mcck_disable(); |
| 970 | /* Disable channel report machine checks. */ |
| 971 | __ctl_clear_bit(14, 28); |
| 972 | s390_reset_mcck_handler = NULL; |
| 973 | } |
| 974 | |
| 975 | static struct reset_call css_reset_call = { |
| 976 | .fn = css_reset, |
| 977 | }; |
| 978 | |
| 979 | static int __init init_css_reset_call(void) |
| 980 | { |
| 981 | atomic_set(&chpid_reset_count, 0); |
| 982 | register_reset_call(&css_reset_call); |
| 983 | return 0; |
| 984 | } |
| 985 | |
| 986 | arch_initcall(init_css_reset_call); |
| 987 | |
| 988 | struct sch_match_id { |
| 989 | struct subchannel_id schid; |
| 990 | struct ccw_dev_id devid; |
| 991 | int rc; |
| 992 | }; |
| 993 | |
| 994 | static int __reipl_subchannel_match(struct subchannel_id schid, void *data) |
| 995 | { |
| 996 | struct schib schib; |
| 997 | struct sch_match_id *match_id = data; |
| 998 | |
Michael Holzheu | a45e141 | 2006-12-15 17:18:22 +0100 | [diff] [blame] | 999 | if (stsch_reset(schid, &schib)) |
Heiko Carstens | 15e9b58 | 2006-12-04 15:40:26 +0100 | [diff] [blame] | 1000 | return -ENXIO; |
| 1001 | if (schib.pmcw.dnv && |
| 1002 | (schib.pmcw.dev == match_id->devid.devno) && |
| 1003 | (schid.ssid == match_id->devid.ssid)) { |
| 1004 | match_id->schid = schid; |
| 1005 | match_id->rc = 0; |
| 1006 | return 1; |
| 1007 | } |
| 1008 | return 0; |
| 1009 | } |
| 1010 | |
| 1011 | static int reipl_find_schid(struct ccw_dev_id *devid, |
| 1012 | struct subchannel_id *schid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1013 | { |
Michael Holzheu | ff6b8ea | 2006-09-20 15:58:49 +0200 | [diff] [blame] | 1014 | struct sch_match_id match_id; |
| 1015 | |
| 1016 | match_id.devid = *devid; |
| 1017 | match_id.rc = -ENODEV; |
Heiko Carstens | 15e9b58 | 2006-12-04 15:40:26 +0100 | [diff] [blame] | 1018 | for_each_subchannel(__reipl_subchannel_match, &match_id); |
Michael Holzheu | ff6b8ea | 2006-09-20 15:58:49 +0200 | [diff] [blame] | 1019 | if (match_id.rc == 0) |
| 1020 | *schid = match_id.schid; |
| 1021 | return match_id.rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1022 | } |
| 1023 | |
Michael Holzheu | ff6b8ea | 2006-09-20 15:58:49 +0200 | [diff] [blame] | 1024 | extern void do_reipl_asm(__u32 schid); |
| 1025 | |
| 1026 | /* Make sure all subchannels are quiet before we re-ipl an lpar. */ |
| 1027 | void reipl_ccw_dev(struct ccw_dev_id *devid) |
| 1028 | { |
| 1029 | struct subchannel_id schid; |
| 1030 | |
Heiko Carstens | 15e9b58 | 2006-12-04 15:40:26 +0100 | [diff] [blame] | 1031 | s390_reset_system(); |
| 1032 | if (reipl_find_schid(devid, &schid) != 0) |
Michael Holzheu | ff6b8ea | 2006-09-20 15:58:49 +0200 | [diff] [blame] | 1033 | panic("IPL Device not found\n"); |
Michael Holzheu | ff6b8ea | 2006-09-20 15:58:49 +0200 | [diff] [blame] | 1034 | do_reipl_asm(*((__u32*)&schid)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1035 | } |
Heiko Carstens | e87bfe5 | 2006-09-20 15:59:15 +0200 | [diff] [blame] | 1036 | |
| 1037 | extern struct schib ipl_schib; |
| 1038 | |
| 1039 | /* |
| 1040 | * ipl_save_parameters gets called very early. It is not allowed to access |
| 1041 | * anything in the bss section at all. The bss section is not cleared yet, |
| 1042 | * but may contain some ipl parameters written by the firmware. |
| 1043 | * These parameters (if present) are copied to 0x2000. |
| 1044 | * To avoid corruption of the ipl parameters, all variables used by this |
| 1045 | * function must reside on the stack or in the data section. |
| 1046 | */ |
| 1047 | void ipl_save_parameters(void) |
| 1048 | { |
| 1049 | struct subchannel_id schid; |
| 1050 | unsigned int *ipl_ptr; |
| 1051 | void *src, *dst; |
| 1052 | |
| 1053 | schid = *(struct subchannel_id *)__LC_SUBCHANNEL_ID; |
| 1054 | if (!schid.one) |
| 1055 | return; |
| 1056 | if (stsch(schid, &ipl_schib)) |
| 1057 | return; |
| 1058 | if (!ipl_schib.pmcw.dnv) |
| 1059 | return; |
| 1060 | ipl_devno = ipl_schib.pmcw.dev; |
| 1061 | ipl_flags |= IPL_DEVNO_VALID; |
| 1062 | if (!ipl_schib.pmcw.qf) |
| 1063 | return; |
| 1064 | ipl_flags |= IPL_PARMBLOCK_VALID; |
| 1065 | ipl_ptr = (unsigned int *)__LC_IPL_PARMBLOCK_PTR; |
| 1066 | src = (void *)(unsigned long)*ipl_ptr; |
| 1067 | dst = (void *)IPL_PARMBLOCK_ORIGIN; |
| 1068 | memmove(dst, src, PAGE_SIZE); |
| 1069 | *ipl_ptr = IPL_PARMBLOCK_ORIGIN; |
| 1070 | } |