Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * drivers/s390/cio/cio.c | |
3 | * S/390 common I/O routines -- low level i/o calls | |
1da177e4 LT |
4 | * |
5 | * Copyright (C) 1999-2002 IBM Deutschland Entwicklung GmbH, | |
6 | * IBM Corporation | |
7 | * Author(s): Ingo Adlung (adlung@de.ibm.com) | |
4ce3b30c | 8 | * Cornelia Huck (cornelia.huck@de.ibm.com) |
1da177e4 LT |
9 | * Arnd Bergmann (arndb@de.ibm.com) |
10 | * Martin Schwidefsky (schwidefsky@de.ibm.com) | |
11 | */ | |
12 | ||
13 | #include <linux/module.h> | |
1da177e4 LT |
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> | |
1da177e4 LT |
19 | #include <asm/cio.h> |
20 | #include <asm/delay.h> | |
21 | #include <asm/irq.h> | |
5a489b98 | 22 | #include <asm/irq_regs.h> |
e87bfe51 | 23 | #include <asm/setup.h> |
15e9b586 | 24 | #include <asm/reset.h> |
1da177e4 LT |
25 | #include "airq.h" |
26 | #include "cio.h" | |
27 | #include "css.h" | |
28 | #include "chsc.h" | |
29 | #include "ioasm.h" | |
30 | #include "blacklist.h" | |
31 | #include "cio_debug.h" | |
15e9b586 | 32 | #include "../s390mach.h" |
1da177e4 LT |
33 | |
34 | debug_info_t *cio_debug_msg_id; | |
35 | debug_info_t *cio_debug_trace_id; | |
36 | debug_info_t *cio_debug_crw_id; | |
37 | ||
38 | int cio_show_msg; | |
39 | ||
40 | static int __init | |
41 | cio_setup (char *parm) | |
42 | { | |
43 | if (!strcmp (parm, "yes")) | |
44 | cio_show_msg = 1; | |
45 | else if (!strcmp (parm, "no")) | |
46 | cio_show_msg = 0; | |
47 | else | |
48 | printk (KERN_ERR "cio_setup : invalid cio_msg parameter '%s'", | |
49 | parm); | |
50 | return 1; | |
51 | } | |
52 | ||
53 | __setup ("cio_msg=", cio_setup); | |
54 | ||
55 | /* | |
56 | * Function: cio_debug_init | |
57 | * Initializes three debug logs (under /proc/s390dbf) for common I/O: | |
58 | * - cio_msg logs the messages which are printk'ed when CONFIG_DEBUG_IO is on | |
59 | * - cio_trace logs the calling of different functions | |
60 | * - cio_crw logs the messages which are printk'ed when CONFIG_DEBUG_CRW is on | |
61 | * debug levels depend on CONFIG_DEBUG_IO resp. CONFIG_DEBUG_CRW | |
62 | */ | |
63 | static int __init | |
64 | cio_debug_init (void) | |
65 | { | |
66a464db | 66 | cio_debug_msg_id = debug_register ("cio_msg", 16, 4, 16*sizeof (long)); |
1da177e4 LT |
67 | if (!cio_debug_msg_id) |
68 | goto out_unregister; | |
69 | debug_register_view (cio_debug_msg_id, &debug_sprintf_view); | |
70 | debug_set_level (cio_debug_msg_id, 2); | |
06fbcb10 | 71 | cio_debug_trace_id = debug_register ("cio_trace", 16, 4, 16); |
1da177e4 LT |
72 | if (!cio_debug_trace_id) |
73 | goto out_unregister; | |
74 | debug_register_view (cio_debug_trace_id, &debug_hex_ascii_view); | |
75 | debug_set_level (cio_debug_trace_id, 2); | |
66a464db | 76 | cio_debug_crw_id = debug_register ("cio_crw", 4, 4, 16*sizeof (long)); |
1da177e4 LT |
77 | if (!cio_debug_crw_id) |
78 | goto out_unregister; | |
79 | debug_register_view (cio_debug_crw_id, &debug_sprintf_view); | |
80 | debug_set_level (cio_debug_crw_id, 2); | |
81 | pr_debug("debugging initialized\n"); | |
82 | return 0; | |
83 | ||
84 | out_unregister: | |
85 | if (cio_debug_msg_id) | |
86 | debug_unregister (cio_debug_msg_id); | |
87 | if (cio_debug_trace_id) | |
88 | debug_unregister (cio_debug_trace_id); | |
89 | if (cio_debug_crw_id) | |
90 | debug_unregister (cio_debug_crw_id); | |
91 | pr_debug("could not initialize debugging\n"); | |
92 | return -1; | |
93 | } | |
94 | ||
95 | arch_initcall (cio_debug_init); | |
96 | ||
97 | int | |
98 | cio_set_options (struct subchannel *sch, int flags) | |
99 | { | |
100 | sch->options.suspend = (flags & DOIO_ALLOW_SUSPEND) != 0; | |
101 | sch->options.prefetch = (flags & DOIO_DENY_PREFETCH) != 0; | |
102 | sch->options.inter = (flags & DOIO_SUPPRESS_INTER) != 0; | |
103 | return 0; | |
104 | } | |
105 | ||
106 | /* FIXME: who wants to use this? */ | |
107 | int | |
108 | cio_get_options (struct subchannel *sch) | |
109 | { | |
110 | int flags; | |
111 | ||
112 | flags = 0; | |
113 | if (sch->options.suspend) | |
114 | flags |= DOIO_ALLOW_SUSPEND; | |
115 | if (sch->options.prefetch) | |
116 | flags |= DOIO_DENY_PREFETCH; | |
117 | if (sch->options.inter) | |
118 | flags |= DOIO_SUPPRESS_INTER; | |
119 | return flags; | |
120 | } | |
121 | ||
122 | /* | |
123 | * Use tpi to get a pending interrupt, call the interrupt handler and | |
124 | * return a pointer to the subchannel structure. | |
125 | */ | |
126 | static inline int | |
127 | cio_tpi(void) | |
128 | { | |
129 | struct tpi_info *tpi_info; | |
130 | struct subchannel *sch; | |
131 | struct irb *irb; | |
132 | ||
133 | tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID; | |
134 | if (tpi (NULL) != 1) | |
135 | return 0; | |
136 | irb = (struct irb *) __LC_IRB; | |
137 | /* Store interrupt response block to lowcore. */ | |
a8237fc4 | 138 | if (tsch (tpi_info->schid, irb) != 0) |
1da177e4 LT |
139 | /* Not status pending or not operational. */ |
140 | return 1; | |
141 | sch = (struct subchannel *)(unsigned long)tpi_info->intparm; | |
142 | if (!sch) | |
143 | return 1; | |
144 | local_bh_disable(); | |
145 | irq_enter (); | |
2ec22984 | 146 | spin_lock(sch->lock); |
1da177e4 LT |
147 | memcpy (&sch->schib.scsw, &irb->scsw, sizeof (struct scsw)); |
148 | if (sch->driver && sch->driver->irq) | |
149 | sch->driver->irq(&sch->dev); | |
2ec22984 | 150 | spin_unlock(sch->lock); |
1da177e4 | 151 | irq_exit (); |
1f194a4c | 152 | _local_bh_enable(); |
1da177e4 LT |
153 | return 1; |
154 | } | |
155 | ||
156 | static inline int | |
157 | cio_start_handle_notoper(struct subchannel *sch, __u8 lpm) | |
158 | { | |
159 | char dbf_text[15]; | |
160 | ||
161 | if (lpm != 0) | |
162 | sch->lpm &= ~lpm; | |
163 | else | |
164 | sch->lpm = 0; | |
165 | ||
a8237fc4 | 166 | stsch (sch->schid, &sch->schib); |
1da177e4 LT |
167 | |
168 | CIO_MSG_EVENT(0, "cio_start: 'not oper' status for " | |
fb6958a5 CH |
169 | "subchannel 0.%x.%04x!\n", sch->schid.ssid, |
170 | sch->schid.sch_no); | |
1da177e4 LT |
171 | sprintf(dbf_text, "no%s", sch->dev.bus_id); |
172 | CIO_TRACE_EVENT(0, dbf_text); | |
173 | CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib)); | |
174 | ||
175 | return (sch->lpm ? -EACCES : -ENODEV); | |
176 | } | |
177 | ||
178 | int | |
179 | cio_start_key (struct subchannel *sch, /* subchannel structure */ | |
180 | struct ccw1 * cpa, /* logical channel prog addr */ | |
181 | __u8 lpm, /* logical path mask */ | |
182 | __u8 key) /* storage key */ | |
183 | { | |
184 | char dbf_txt[15]; | |
185 | int ccode; | |
186 | ||
187 | CIO_TRACE_EVENT (4, "stIO"); | |
188 | CIO_TRACE_EVENT (4, sch->dev.bus_id); | |
189 | ||
190 | /* sch is always under 2G. */ | |
191 | sch->orb.intparm = (__u32)(unsigned long)sch; | |
192 | sch->orb.fmt = 1; | |
193 | ||
194 | sch->orb.pfch = sch->options.prefetch == 0; | |
195 | sch->orb.spnd = sch->options.suspend; | |
196 | sch->orb.ssic = sch->options.suspend && sch->options.inter; | |
e0e32c8e | 197 | sch->orb.lpm = (lpm != 0) ? lpm : sch->lpm; |
347a8dc3 | 198 | #ifdef CONFIG_64BIT |
1da177e4 LT |
199 | /* |
200 | * for 64 bit we always support 64 bit IDAWs with 4k page size only | |
201 | */ | |
202 | sch->orb.c64 = 1; | |
203 | sch->orb.i2k = 0; | |
204 | #endif | |
205 | sch->orb.key = key >> 4; | |
206 | /* issue "Start Subchannel" */ | |
207 | sch->orb.cpa = (__u32) __pa (cpa); | |
a8237fc4 | 208 | ccode = ssch (sch->schid, &sch->orb); |
1da177e4 LT |
209 | |
210 | /* process condition code */ | |
211 | sprintf (dbf_txt, "ccode:%d", ccode); | |
212 | CIO_TRACE_EVENT (4, dbf_txt); | |
213 | ||
214 | switch (ccode) { | |
215 | case 0: | |
216 | /* | |
217 | * initialize device status information | |
218 | */ | |
219 | sch->schib.scsw.actl |= SCSW_ACTL_START_PEND; | |
220 | return 0; | |
221 | case 1: /* status pending */ | |
222 | case 2: /* busy */ | |
223 | return -EBUSY; | |
224 | default: /* device/path not operational */ | |
225 | return cio_start_handle_notoper(sch, lpm); | |
226 | } | |
227 | } | |
228 | ||
229 | int | |
230 | cio_start (struct subchannel *sch, struct ccw1 *cpa, __u8 lpm) | |
231 | { | |
0b642ede | 232 | return cio_start_key(sch, cpa, lpm, PAGE_DEFAULT_KEY); |
1da177e4 LT |
233 | } |
234 | ||
235 | /* | |
236 | * resume suspended I/O operation | |
237 | */ | |
238 | int | |
239 | cio_resume (struct subchannel *sch) | |
240 | { | |
241 | char dbf_txt[15]; | |
242 | int ccode; | |
243 | ||
244 | CIO_TRACE_EVENT (4, "resIO"); | |
245 | CIO_TRACE_EVENT (4, sch->dev.bus_id); | |
246 | ||
a8237fc4 | 247 | ccode = rsch (sch->schid); |
1da177e4 LT |
248 | |
249 | sprintf (dbf_txt, "ccode:%d", ccode); | |
250 | CIO_TRACE_EVENT (4, dbf_txt); | |
251 | ||
252 | switch (ccode) { | |
253 | case 0: | |
254 | sch->schib.scsw.actl |= SCSW_ACTL_RESUME_PEND; | |
255 | return 0; | |
256 | case 1: | |
257 | return -EBUSY; | |
258 | case 2: | |
259 | return -EINVAL; | |
260 | default: | |
261 | /* | |
262 | * useless to wait for request completion | |
263 | * as device is no longer operational ! | |
264 | */ | |
265 | return -ENODEV; | |
266 | } | |
267 | } | |
268 | ||
269 | /* | |
270 | * halt I/O operation | |
271 | */ | |
272 | int | |
273 | cio_halt(struct subchannel *sch) | |
274 | { | |
275 | char dbf_txt[15]; | |
276 | int ccode; | |
277 | ||
278 | if (!sch) | |
279 | return -ENODEV; | |
280 | ||
281 | CIO_TRACE_EVENT (2, "haltIO"); | |
282 | CIO_TRACE_EVENT (2, sch->dev.bus_id); | |
283 | ||
284 | /* | |
285 | * Issue "Halt subchannel" and process condition code | |
286 | */ | |
a8237fc4 | 287 | ccode = hsch (sch->schid); |
1da177e4 LT |
288 | |
289 | sprintf (dbf_txt, "ccode:%d", ccode); | |
290 | CIO_TRACE_EVENT (2, dbf_txt); | |
291 | ||
292 | switch (ccode) { | |
293 | case 0: | |
294 | sch->schib.scsw.actl |= SCSW_ACTL_HALT_PEND; | |
295 | return 0; | |
296 | case 1: /* status pending */ | |
297 | case 2: /* busy */ | |
298 | return -EBUSY; | |
299 | default: /* device not operational */ | |
300 | return -ENODEV; | |
301 | } | |
302 | } | |
303 | ||
304 | /* | |
305 | * Clear I/O operation | |
306 | */ | |
307 | int | |
308 | cio_clear(struct subchannel *sch) | |
309 | { | |
310 | char dbf_txt[15]; | |
311 | int ccode; | |
312 | ||
313 | if (!sch) | |
314 | return -ENODEV; | |
315 | ||
316 | CIO_TRACE_EVENT (2, "clearIO"); | |
317 | CIO_TRACE_EVENT (2, sch->dev.bus_id); | |
318 | ||
319 | /* | |
320 | * Issue "Clear subchannel" and process condition code | |
321 | */ | |
a8237fc4 | 322 | ccode = csch (sch->schid); |
1da177e4 LT |
323 | |
324 | sprintf (dbf_txt, "ccode:%d", ccode); | |
325 | CIO_TRACE_EVENT (2, dbf_txt); | |
326 | ||
327 | switch (ccode) { | |
328 | case 0: | |
329 | sch->schib.scsw.actl |= SCSW_ACTL_CLEAR_PEND; | |
330 | return 0; | |
331 | default: /* device not operational */ | |
332 | return -ENODEV; | |
333 | } | |
334 | } | |
335 | ||
336 | /* | |
337 | * Function: cio_cancel | |
338 | * Issues a "Cancel Subchannel" on the specified subchannel | |
339 | * Note: We don't need any fancy intparms and flags here | |
340 | * since xsch is executed synchronously. | |
341 | * Only for common I/O internal use as for now. | |
342 | */ | |
343 | int | |
344 | cio_cancel (struct subchannel *sch) | |
345 | { | |
346 | char dbf_txt[15]; | |
347 | int ccode; | |
348 | ||
349 | if (!sch) | |
350 | return -ENODEV; | |
351 | ||
352 | CIO_TRACE_EVENT (2, "cancelIO"); | |
353 | CIO_TRACE_EVENT (2, sch->dev.bus_id); | |
354 | ||
a8237fc4 | 355 | ccode = xsch (sch->schid); |
1da177e4 LT |
356 | |
357 | sprintf (dbf_txt, "ccode:%d", ccode); | |
358 | CIO_TRACE_EVENT (2, dbf_txt); | |
359 | ||
360 | switch (ccode) { | |
361 | case 0: /* success */ | |
362 | /* Update information in scsw. */ | |
a8237fc4 | 363 | stsch (sch->schid, &sch->schib); |
1da177e4 LT |
364 | return 0; |
365 | case 1: /* status pending */ | |
366 | return -EBUSY; | |
367 | case 2: /* not applicable */ | |
368 | return -EINVAL; | |
369 | default: /* not oper */ | |
370 | return -ENODEV; | |
371 | } | |
372 | } | |
373 | ||
374 | /* | |
375 | * Function: cio_modify | |
376 | * Issues a "Modify Subchannel" on the specified subchannel | |
377 | */ | |
378 | int | |
379 | cio_modify (struct subchannel *sch) | |
380 | { | |
381 | int ccode, retry, ret; | |
382 | ||
383 | ret = 0; | |
384 | for (retry = 0; retry < 5; retry++) { | |
a8237fc4 | 385 | ccode = msch_err (sch->schid, &sch->schib); |
1da177e4 LT |
386 | if (ccode < 0) /* -EIO if msch gets a program check. */ |
387 | return ccode; | |
388 | switch (ccode) { | |
389 | case 0: /* successfull */ | |
390 | return 0; | |
391 | case 1: /* status pending */ | |
392 | return -EBUSY; | |
393 | case 2: /* busy */ | |
394 | udelay (100); /* allow for recovery */ | |
395 | ret = -EBUSY; | |
396 | break; | |
397 | case 3: /* not operational */ | |
398 | return -ENODEV; | |
399 | } | |
400 | } | |
401 | return ret; | |
402 | } | |
403 | ||
404 | /* | |
405 | * Enable subchannel. | |
406 | */ | |
407 | int | |
408 | cio_enable_subchannel (struct subchannel *sch, unsigned int isc) | |
409 | { | |
410 | char dbf_txt[15]; | |
411 | int ccode; | |
412 | int retry; | |
413 | int ret; | |
414 | ||
415 | CIO_TRACE_EVENT (2, "ensch"); | |
416 | CIO_TRACE_EVENT (2, sch->dev.bus_id); | |
417 | ||
a8237fc4 | 418 | ccode = stsch (sch->schid, &sch->schib); |
1da177e4 LT |
419 | if (ccode) |
420 | return -ENODEV; | |
421 | ||
422 | for (retry = 5, ret = 0; retry > 0; retry--) { | |
423 | sch->schib.pmcw.ena = 1; | |
424 | sch->schib.pmcw.isc = isc; | |
425 | sch->schib.pmcw.intparm = (__u32)(unsigned long)sch; | |
426 | ret = cio_modify(sch); | |
427 | if (ret == -ENODEV) | |
428 | break; | |
429 | if (ret == -EIO) | |
430 | /* | |
431 | * Got a program check in cio_modify. Try without | |
432 | * the concurrent sense bit the next time. | |
433 | */ | |
434 | sch->schib.pmcw.csense = 0; | |
435 | if (ret == 0) { | |
a8237fc4 | 436 | stsch (sch->schid, &sch->schib); |
1da177e4 LT |
437 | if (sch->schib.pmcw.ena) |
438 | break; | |
439 | } | |
440 | if (ret == -EBUSY) { | |
441 | struct irb irb; | |
a8237fc4 | 442 | if (tsch(sch->schid, &irb) != 0) |
1da177e4 LT |
443 | break; |
444 | } | |
445 | } | |
446 | sprintf (dbf_txt, "ret:%d", ret); | |
447 | CIO_TRACE_EVENT (2, dbf_txt); | |
448 | return ret; | |
449 | } | |
450 | ||
451 | /* | |
452 | * Disable subchannel. | |
453 | */ | |
454 | int | |
455 | cio_disable_subchannel (struct subchannel *sch) | |
456 | { | |
457 | char dbf_txt[15]; | |
458 | int ccode; | |
459 | int retry; | |
460 | int ret; | |
461 | ||
462 | CIO_TRACE_EVENT (2, "dissch"); | |
463 | CIO_TRACE_EVENT (2, sch->dev.bus_id); | |
464 | ||
a8237fc4 | 465 | ccode = stsch (sch->schid, &sch->schib); |
1da177e4 LT |
466 | if (ccode == 3) /* Not operational. */ |
467 | return -ENODEV; | |
468 | ||
469 | if (sch->schib.scsw.actl != 0) | |
470 | /* | |
471 | * the disable function must not be called while there are | |
472 | * requests pending for completion ! | |
473 | */ | |
474 | return -EBUSY; | |
475 | ||
476 | for (retry = 5, ret = 0; retry > 0; retry--) { | |
477 | sch->schib.pmcw.ena = 0; | |
478 | ret = cio_modify(sch); | |
479 | if (ret == -ENODEV) | |
480 | break; | |
481 | if (ret == -EBUSY) | |
482 | /* | |
483 | * The subchannel is busy or status pending. | |
484 | * We'll disable when the next interrupt was delivered | |
485 | * via the state machine. | |
486 | */ | |
487 | break; | |
488 | if (ret == 0) { | |
a8237fc4 | 489 | stsch (sch->schid, &sch->schib); |
1da177e4 LT |
490 | if (!sch->schib.pmcw.ena) |
491 | break; | |
492 | } | |
493 | } | |
494 | sprintf (dbf_txt, "ret:%d", ret); | |
495 | CIO_TRACE_EVENT (2, dbf_txt); | |
496 | return ret; | |
497 | } | |
498 | ||
2ec22984 CH |
499 | static int cio_create_sch_lock(struct subchannel *sch) |
500 | { | |
501 | sch->lock = kmalloc(sizeof(spinlock_t), GFP_KERNEL); | |
502 | if (!sch->lock) | |
503 | return -ENOMEM; | |
504 | spin_lock_init(sch->lock); | |
505 | return 0; | |
506 | } | |
507 | ||
1da177e4 LT |
508 | /* |
509 | * cio_validate_subchannel() | |
510 | * | |
511 | * Find out subchannel type and initialize struct subchannel. | |
512 | * Return codes: | |
513 | * SUBCHANNEL_TYPE_IO for a normal io subchannel | |
514 | * SUBCHANNEL_TYPE_CHSC for a chsc subchannel | |
515 | * SUBCHANNEL_TYPE_MESSAGE for a messaging subchannel | |
516 | * SUBCHANNEL_TYPE_ADM for a adm(?) subchannel | |
517 | * -ENXIO for non-defined subchannels | |
518 | * -ENODEV for subchannels with invalid device number or blacklisted devices | |
519 | */ | |
520 | int | |
a8237fc4 | 521 | cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid) |
1da177e4 LT |
522 | { |
523 | char dbf_txt[15]; | |
524 | int ccode; | |
2ec22984 | 525 | int err; |
1da177e4 | 526 | |
a8237fc4 | 527 | sprintf (dbf_txt, "valsch%x", schid.sch_no); |
1da177e4 LT |
528 | CIO_TRACE_EVENT (4, dbf_txt); |
529 | ||
530 | /* Nuke all fields. */ | |
531 | memset(sch, 0, sizeof(struct subchannel)); | |
532 | ||
2ec22984 CH |
533 | sch->schid = schid; |
534 | if (cio_is_console(schid)) { | |
535 | sch->lock = cio_get_console_lock(); | |
536 | } else { | |
537 | err = cio_create_sch_lock(sch); | |
538 | if (err) | |
539 | goto out; | |
540 | } | |
6ab4879a | 541 | mutex_init(&sch->reg_mutex); |
1da177e4 | 542 | /* Set a name for the subchannel */ |
fb6958a5 CH |
543 | snprintf (sch->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x", schid.ssid, |
544 | schid.sch_no); | |
1da177e4 LT |
545 | |
546 | /* | |
547 | * The first subchannel that is not-operational (ccode==3) | |
548 | * indicates that there aren't any more devices available. | |
fb6958a5 CH |
549 | * If stsch gets an exception, it means the current subchannel set |
550 | * is not valid. | |
1da177e4 | 551 | */ |
fb6958a5 | 552 | ccode = stsch_err (schid, &sch->schib); |
2ec22984 CH |
553 | if (ccode) { |
554 | err = (ccode == 3) ? -ENXIO : ccode; | |
555 | goto out; | |
556 | } | |
1da177e4 LT |
557 | /* Copy subchannel type from path management control word. */ |
558 | sch->st = sch->schib.pmcw.st; | |
559 | ||
560 | /* | |
561 | * ... just being curious we check for non I/O subchannels | |
562 | */ | |
563 | if (sch->st != 0) { | |
564 | CIO_DEBUG(KERN_INFO, 0, | |
fb6958a5 | 565 | "Subchannel 0.%x.%04x reports " |
1da177e4 | 566 | "non-I/O subchannel type %04X\n", |
fb6958a5 | 567 | sch->schid.ssid, sch->schid.sch_no, sch->st); |
1da177e4 | 568 | /* We stop here for non-io subchannels. */ |
2ec22984 CH |
569 | err = sch->st; |
570 | goto out; | |
1da177e4 LT |
571 | } |
572 | ||
573 | /* Initialization for io subchannels. */ | |
2ec22984 | 574 | if (!sch->schib.pmcw.dnv) { |
1da177e4 | 575 | /* io subchannel but device number is invalid. */ |
2ec22984 CH |
576 | err = -ENODEV; |
577 | goto out; | |
578 | } | |
1da177e4 | 579 | /* Devno is valid. */ |
fb6958a5 | 580 | if (is_blacklisted (sch->schid.ssid, sch->schib.pmcw.dev)) { |
1da177e4 LT |
581 | /* |
582 | * This device must not be known to Linux. So we simply | |
583 | * say that there is no device and return ENODEV. | |
584 | */ | |
585 | CIO_MSG_EVENT(0, "Blacklisted device detected " | |
fb6958a5 CH |
586 | "at devno %04X, subchannel set %x\n", |
587 | sch->schib.pmcw.dev, sch->schid.ssid); | |
2ec22984 CH |
588 | err = -ENODEV; |
589 | goto out; | |
1da177e4 LT |
590 | } |
591 | sch->opm = 0xff; | |
fb6958a5 CH |
592 | if (!cio_is_console(sch->schid)) |
593 | chsc_validate_chpids(sch); | |
28bdc6f6 | 594 | sch->lpm = sch->schib.pmcw.pam & sch->opm; |
1da177e4 LT |
595 | |
596 | CIO_DEBUG(KERN_INFO, 0, | |
fb6958a5 | 597 | "Detected device %04x on subchannel 0.%x.%04X" |
1da177e4 | 598 | " - PIM = %02X, PAM = %02X, POM = %02X\n", |
fb6958a5 CH |
599 | sch->schib.pmcw.dev, sch->schid.ssid, |
600 | sch->schid.sch_no, sch->schib.pmcw.pim, | |
1da177e4 LT |
601 | sch->schib.pmcw.pam, sch->schib.pmcw.pom); |
602 | ||
603 | /* | |
604 | * We now have to initially ... | |
605 | * ... set "interruption subclass" | |
606 | * ... enable "concurrent sense" | |
607 | * ... enable "multipath mode" if more than one | |
608 | * CHPID is available. This is done regardless | |
609 | * whether multiple paths are available for us. | |
610 | */ | |
611 | sch->schib.pmcw.isc = 3; /* could be smth. else */ | |
612 | sch->schib.pmcw.csense = 1; /* concurrent sense */ | |
613 | sch->schib.pmcw.ena = 0; | |
614 | if ((sch->lpm & (sch->lpm - 1)) != 0) | |
615 | sch->schib.pmcw.mp = 1; /* multipath mode */ | |
616 | return 0; | |
2ec22984 CH |
617 | out: |
618 | if (!cio_is_console(schid)) | |
619 | kfree(sch->lock); | |
620 | sch->lock = NULL; | |
621 | return err; | |
1da177e4 LT |
622 | } |
623 | ||
624 | /* | |
625 | * do_IRQ() handles all normal I/O device IRQ's (the special | |
626 | * SMP cross-CPU interrupts have their own specific | |
627 | * handlers). | |
628 | * | |
629 | */ | |
630 | void | |
631 | do_IRQ (struct pt_regs *regs) | |
632 | { | |
633 | struct tpi_info *tpi_info; | |
634 | struct subchannel *sch; | |
635 | struct irb *irb; | |
5a489b98 | 636 | struct pt_regs *old_regs; |
1da177e4 | 637 | |
5a489b98 | 638 | old_regs = set_irq_regs(regs); |
9d0a57cb | 639 | irq_enter(); |
1da177e4 LT |
640 | asm volatile ("mc 0,0"); |
641 | if (S390_lowcore.int_clock >= S390_lowcore.jiffy_timer) | |
642 | /** | |
643 | * Make sure that the i/o interrupt did not "overtake" | |
644 | * the last HZ timer interrupt. | |
645 | */ | |
5a489b98 | 646 | account_ticks(); |
1da177e4 LT |
647 | /* |
648 | * Get interrupt information from lowcore | |
649 | */ | |
650 | tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID; | |
651 | irb = (struct irb *) __LC_IRB; | |
652 | do { | |
653 | kstat_cpu(smp_processor_id()).irqs[IO_INTERRUPT]++; | |
654 | /* | |
655 | * Non I/O-subchannel thin interrupts are processed differently | |
656 | */ | |
657 | if (tpi_info->adapter_IO == 1 && | |
658 | tpi_info->int_type == IO_INTERRUPT_TYPE) { | |
659 | do_adapter_IO(); | |
660 | continue; | |
661 | } | |
662 | sch = (struct subchannel *)(unsigned long)tpi_info->intparm; | |
663 | if (sch) | |
2ec22984 | 664 | spin_lock(sch->lock); |
1da177e4 | 665 | /* Store interrupt response block to lowcore. */ |
a8237fc4 | 666 | if (tsch (tpi_info->schid, irb) == 0 && sch) { |
1da177e4 LT |
667 | /* Keep subchannel information word up to date. */ |
668 | memcpy (&sch->schib.scsw, &irb->scsw, | |
669 | sizeof (irb->scsw)); | |
670 | /* Call interrupt handler if there is one. */ | |
671 | if (sch->driver && sch->driver->irq) | |
672 | sch->driver->irq(&sch->dev); | |
673 | } | |
674 | if (sch) | |
2ec22984 | 675 | spin_unlock(sch->lock); |
1da177e4 LT |
676 | /* |
677 | * Are more interrupts pending? | |
678 | * If so, the tpi instruction will update the lowcore | |
679 | * to hold the info for the next interrupt. | |
680 | * We don't do this for VM because a tpi drops the cpu | |
681 | * out of the sie which costs more cycles than it saves. | |
682 | */ | |
683 | } while (!MACHINE_IS_VM && tpi (NULL) != 0); | |
9d0a57cb | 684 | irq_exit(); |
5a489b98 | 685 | set_irq_regs(old_regs); |
1da177e4 LT |
686 | } |
687 | ||
688 | #ifdef CONFIG_CCW_CONSOLE | |
689 | static struct subchannel console_subchannel; | |
690 | static int console_subchannel_in_use; | |
691 | ||
692 | /* | |
693 | * busy wait for the next interrupt on the console | |
694 | */ | |
695 | void | |
696 | wait_cons_dev (void) | |
697 | { | |
698 | unsigned long cr6 __attribute__ ((aligned (8))); | |
699 | unsigned long save_cr6 __attribute__ ((aligned (8))); | |
700 | ||
701 | /* | |
702 | * before entering the spinlock we may already have | |
703 | * processed the interrupt on a different CPU... | |
704 | */ | |
705 | if (!console_subchannel_in_use) | |
706 | return; | |
707 | ||
708 | /* disable all but isc 7 (console device) */ | |
709 | __ctl_store (save_cr6, 6, 6); | |
710 | cr6 = 0x01000000; | |
711 | __ctl_load (cr6, 6, 6); | |
712 | ||
713 | do { | |
2ec22984 | 714 | spin_unlock(console_subchannel.lock); |
1da177e4 LT |
715 | if (!cio_tpi()) |
716 | cpu_relax(); | |
2ec22984 | 717 | spin_lock(console_subchannel.lock); |
1da177e4 LT |
718 | } while (console_subchannel.schib.scsw.actl != 0); |
719 | /* | |
720 | * restore previous isc value | |
721 | */ | |
722 | __ctl_load (save_cr6, 6, 6); | |
723 | } | |
724 | ||
725 | static int | |
f97a56fb CH |
726 | cio_test_for_console(struct subchannel_id schid, void *data) |
727 | { | |
fb6958a5 | 728 | if (stsch_err(schid, &console_subchannel.schib) != 0) |
f97a56fb CH |
729 | return -ENXIO; |
730 | if (console_subchannel.schib.pmcw.dnv && | |
731 | console_subchannel.schib.pmcw.dev == | |
732 | console_devno) { | |
733 | console_irq = schid.sch_no; | |
734 | return 1; /* found */ | |
735 | } | |
736 | return 0; | |
737 | } | |
738 | ||
739 | ||
740 | static int | |
741 | cio_get_console_sch_no(void) | |
1da177e4 | 742 | { |
a8237fc4 | 743 | struct subchannel_id schid; |
1da177e4 | 744 | |
a8237fc4 | 745 | init_subchannel_id(&schid); |
1da177e4 LT |
746 | if (console_irq != -1) { |
747 | /* VM provided us with the irq number of the console. */ | |
a8237fc4 CH |
748 | schid.sch_no = console_irq; |
749 | if (stsch(schid, &console_subchannel.schib) != 0 || | |
1da177e4 LT |
750 | !console_subchannel.schib.pmcw.dnv) |
751 | return -1; | |
752 | console_devno = console_subchannel.schib.pmcw.dev; | |
753 | } else if (console_devno != -1) { | |
754 | /* At least the console device number is known. */ | |
f97a56fb | 755 | for_each_subchannel(cio_test_for_console, NULL); |
1da177e4 LT |
756 | if (console_irq == -1) |
757 | return -1; | |
758 | } else { | |
759 | /* unlike in 2.4, we cannot autoprobe here, since | |
760 | * the channel subsystem is not fully initialized. | |
761 | * With some luck, the HWC console can take over */ | |
762 | printk(KERN_WARNING "No ccw console found!\n"); | |
763 | return -1; | |
764 | } | |
765 | return console_irq; | |
766 | } | |
767 | ||
768 | struct subchannel * | |
769 | cio_probe_console(void) | |
770 | { | |
f97a56fb | 771 | int sch_no, ret; |
a8237fc4 | 772 | struct subchannel_id schid; |
1da177e4 LT |
773 | |
774 | if (xchg(&console_subchannel_in_use, 1) != 0) | |
775 | return ERR_PTR(-EBUSY); | |
f97a56fb CH |
776 | sch_no = cio_get_console_sch_no(); |
777 | if (sch_no == -1) { | |
1da177e4 LT |
778 | console_subchannel_in_use = 0; |
779 | return ERR_PTR(-ENODEV); | |
780 | } | |
781 | memset(&console_subchannel, 0, sizeof(struct subchannel)); | |
a8237fc4 | 782 | init_subchannel_id(&schid); |
f97a56fb | 783 | schid.sch_no = sch_no; |
a8237fc4 | 784 | ret = cio_validate_subchannel(&console_subchannel, schid); |
1da177e4 LT |
785 | if (ret) { |
786 | console_subchannel_in_use = 0; | |
787 | return ERR_PTR(-ENODEV); | |
788 | } | |
789 | ||
790 | /* | |
791 | * enable console I/O-interrupt subclass 7 | |
792 | */ | |
793 | ctl_set_bit(6, 24); | |
794 | console_subchannel.schib.pmcw.isc = 7; | |
795 | console_subchannel.schib.pmcw.intparm = | |
796 | (__u32)(unsigned long)&console_subchannel; | |
797 | ret = cio_modify(&console_subchannel); | |
798 | if (ret) { | |
799 | console_subchannel_in_use = 0; | |
800 | return ERR_PTR(ret); | |
801 | } | |
802 | return &console_subchannel; | |
803 | } | |
804 | ||
805 | void | |
806 | cio_release_console(void) | |
807 | { | |
808 | console_subchannel.schib.pmcw.intparm = 0; | |
809 | cio_modify(&console_subchannel); | |
810 | ctl_clear_bit(6, 24); | |
811 | console_subchannel_in_use = 0; | |
812 | } | |
813 | ||
814 | /* Bah... hack to catch console special sausages. */ | |
815 | int | |
a8237fc4 | 816 | cio_is_console(struct subchannel_id schid) |
1da177e4 LT |
817 | { |
818 | if (!console_subchannel_in_use) | |
819 | return 0; | |
a8237fc4 | 820 | return schid_equal(&schid, &console_subchannel.schid); |
1da177e4 LT |
821 | } |
822 | ||
823 | struct subchannel * | |
824 | cio_get_console_subchannel(void) | |
825 | { | |
826 | if (!console_subchannel_in_use) | |
d2c993d8 | 827 | return NULL; |
1da177e4 LT |
828 | return &console_subchannel; |
829 | } | |
830 | ||
831 | #endif | |
832 | static inline int | |
a8237fc4 | 833 | __disable_subchannel_easy(struct subchannel_id schid, struct schib *schib) |
1da177e4 LT |
834 | { |
835 | int retry, cc; | |
836 | ||
837 | cc = 0; | |
838 | for (retry=0;retry<3;retry++) { | |
839 | schib->pmcw.ena = 0; | |
840 | cc = msch(schid, schib); | |
841 | if (cc) | |
842 | return (cc==3?-ENODEV:-EBUSY); | |
843 | stsch(schid, schib); | |
844 | if (!schib->pmcw.ena) | |
845 | return 0; | |
846 | } | |
847 | return -EBUSY; /* uhm... */ | |
848 | } | |
849 | ||
850 | static inline int | |
a8237fc4 | 851 | __clear_subchannel_easy(struct subchannel_id schid) |
1da177e4 LT |
852 | { |
853 | int retry; | |
854 | ||
855 | if (csch(schid)) | |
856 | return -ENODEV; | |
857 | for (retry=0;retry<20;retry++) { | |
858 | struct tpi_info ti; | |
859 | ||
860 | if (tpi(&ti)) { | |
a8237fc4 CH |
861 | tsch(ti.schid, (struct irb *)__LC_IRB); |
862 | if (schid_equal(&ti.schid, &schid)) | |
4c24da79 | 863 | return 0; |
1da177e4 LT |
864 | } |
865 | udelay(100); | |
866 | } | |
867 | return -EBUSY; | |
868 | } | |
869 | ||
15e9b586 | 870 | static int __shutdown_subchannel_easy(struct subchannel_id schid, void *data) |
f97a56fb CH |
871 | { |
872 | struct schib schib; | |
873 | ||
fb6958a5 | 874 | if (stsch_err(schid, &schib)) |
f97a56fb CH |
875 | return -ENXIO; |
876 | if (!schib.pmcw.ena) | |
877 | return 0; | |
878 | switch(__disable_subchannel_easy(schid, &schib)) { | |
879 | case 0: | |
880 | case -ENODEV: | |
881 | break; | |
882 | default: /* -EBUSY */ | |
883 | if (__clear_subchannel_easy(schid)) | |
884 | break; /* give up... */ | |
885 | stsch(schid, &schib); | |
886 | __disable_subchannel_easy(schid, &schib); | |
887 | } | |
888 | return 0; | |
889 | } | |
1da177e4 | 890 | |
15e9b586 HC |
891 | static atomic_t chpid_reset_count; |
892 | ||
893 | static void s390_reset_chpids_mcck_handler(void) | |
894 | { | |
895 | struct crw crw; | |
896 | struct mci *mci; | |
897 | ||
898 | /* Check for pending channel report word. */ | |
899 | mci = (struct mci *)&S390_lowcore.mcck_interruption_code; | |
900 | if (!mci->cp) | |
901 | return; | |
902 | /* Process channel report words. */ | |
903 | while (stcrw(&crw) == 0) { | |
904 | /* Check for responses to RCHP. */ | |
905 | if (crw.slct && crw.rsc == CRW_RSC_CPATH) | |
906 | atomic_dec(&chpid_reset_count); | |
907 | } | |
908 | } | |
909 | ||
910 | #define RCHP_TIMEOUT (30 * USEC_PER_SEC) | |
911 | static void css_reset(void) | |
912 | { | |
913 | int i, ret; | |
914 | unsigned long long timeout; | |
915 | ||
916 | /* Reset subchannels. */ | |
917 | for_each_subchannel(__shutdown_subchannel_easy, NULL); | |
918 | /* Reset channel paths. */ | |
919 | s390_reset_mcck_handler = s390_reset_chpids_mcck_handler; | |
920 | /* Enable channel report machine checks. */ | |
921 | __ctl_set_bit(14, 28); | |
922 | /* Temporarily reenable machine checks. */ | |
923 | local_mcck_enable(); | |
924 | for (i = 0; i <= __MAX_CHPID; i++) { | |
925 | ret = rchp(i); | |
926 | if ((ret == 0) || (ret == 2)) | |
927 | /* | |
928 | * rchp either succeeded, or another rchp is already | |
929 | * in progress. In either case, we'll get a crw. | |
930 | */ | |
931 | atomic_inc(&chpid_reset_count); | |
932 | } | |
933 | /* Wait for machine check for all channel paths. */ | |
934 | timeout = get_clock() + (RCHP_TIMEOUT << 12); | |
935 | while (atomic_read(&chpid_reset_count) != 0) { | |
936 | if (get_clock() > timeout) | |
937 | break; | |
938 | cpu_relax(); | |
939 | } | |
940 | /* Disable machine checks again. */ | |
941 | local_mcck_disable(); | |
942 | /* Disable channel report machine checks. */ | |
943 | __ctl_clear_bit(14, 28); | |
944 | s390_reset_mcck_handler = NULL; | |
945 | } | |
946 | ||
947 | static struct reset_call css_reset_call = { | |
948 | .fn = css_reset, | |
949 | }; | |
950 | ||
951 | static int __init init_css_reset_call(void) | |
952 | { | |
953 | atomic_set(&chpid_reset_count, 0); | |
954 | register_reset_call(&css_reset_call); | |
955 | return 0; | |
956 | } | |
957 | ||
958 | arch_initcall(init_css_reset_call); | |
959 | ||
960 | struct sch_match_id { | |
961 | struct subchannel_id schid; | |
962 | struct ccw_dev_id devid; | |
963 | int rc; | |
964 | }; | |
965 | ||
966 | static int __reipl_subchannel_match(struct subchannel_id schid, void *data) | |
967 | { | |
968 | struct schib schib; | |
969 | struct sch_match_id *match_id = data; | |
970 | ||
971 | if (stsch_err(schid, &schib)) | |
972 | return -ENXIO; | |
973 | if (schib.pmcw.dnv && | |
974 | (schib.pmcw.dev == match_id->devid.devno) && | |
975 | (schid.ssid == match_id->devid.ssid)) { | |
976 | match_id->schid = schid; | |
977 | match_id->rc = 0; | |
978 | return 1; | |
979 | } | |
980 | return 0; | |
981 | } | |
982 | ||
983 | static int reipl_find_schid(struct ccw_dev_id *devid, | |
984 | struct subchannel_id *schid) | |
1da177e4 | 985 | { |
ff6b8ea6 MH |
986 | struct sch_match_id match_id; |
987 | ||
988 | match_id.devid = *devid; | |
989 | match_id.rc = -ENODEV; | |
15e9b586 | 990 | for_each_subchannel(__reipl_subchannel_match, &match_id); |
ff6b8ea6 MH |
991 | if (match_id.rc == 0) |
992 | *schid = match_id.schid; | |
993 | return match_id.rc; | |
1da177e4 LT |
994 | } |
995 | ||
ff6b8ea6 MH |
996 | extern void do_reipl_asm(__u32 schid); |
997 | ||
1da177e4 | 998 | /* Make sure all subchannels are quiet before we re-ipl an lpar. */ |
ff6b8ea6 | 999 | void reipl_ccw_dev(struct ccw_dev_id *devid) |
1da177e4 | 1000 | { |
ff6b8ea6 MH |
1001 | struct subchannel_id schid; |
1002 | ||
15e9b586 HC |
1003 | s390_reset_system(); |
1004 | if (reipl_find_schid(devid, &schid) != 0) | |
ff6b8ea6 | 1005 | panic("IPL Device not found\n"); |
ff6b8ea6 | 1006 | do_reipl_asm(*((__u32*)&schid)); |
1da177e4 | 1007 | } |
e87bfe51 HC |
1008 | |
1009 | extern struct schib ipl_schib; | |
1010 | ||
1011 | /* | |
1012 | * ipl_save_parameters gets called very early. It is not allowed to access | |
1013 | * anything in the bss section at all. The bss section is not cleared yet, | |
1014 | * but may contain some ipl parameters written by the firmware. | |
1015 | * These parameters (if present) are copied to 0x2000. | |
1016 | * To avoid corruption of the ipl parameters, all variables used by this | |
1017 | * function must reside on the stack or in the data section. | |
1018 | */ | |
1019 | void ipl_save_parameters(void) | |
1020 | { | |
1021 | struct subchannel_id schid; | |
1022 | unsigned int *ipl_ptr; | |
1023 | void *src, *dst; | |
1024 | ||
1025 | schid = *(struct subchannel_id *)__LC_SUBCHANNEL_ID; | |
1026 | if (!schid.one) | |
1027 | return; | |
1028 | if (stsch(schid, &ipl_schib)) | |
1029 | return; | |
1030 | if (!ipl_schib.pmcw.dnv) | |
1031 | return; | |
1032 | ipl_devno = ipl_schib.pmcw.dev; | |
1033 | ipl_flags |= IPL_DEVNO_VALID; | |
1034 | if (!ipl_schib.pmcw.qf) | |
1035 | return; | |
1036 | ipl_flags |= IPL_PARMBLOCK_VALID; | |
1037 | ipl_ptr = (unsigned int *)__LC_IPL_PARMBLOCK_PTR; | |
1038 | src = (void *)(unsigned long)*ipl_ptr; | |
1039 | dst = (void *)IPL_PARMBLOCK_ORIGIN; | |
1040 | memmove(dst, src, PAGE_SIZE); | |
1041 | *ipl_ptr = IPL_PARMBLOCK_ORIGIN; | |
1042 | } |