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 | 4 | * |
aa77015c | 5 | * Copyright (C) IBM Corp. 1999,2006 |
1da177e4 | 6 | * Author(s): Ingo Adlung (adlung@de.ibm.com) |
4ce3b30c | 7 | * Cornelia Huck (cornelia.huck@de.ibm.com) |
1da177e4 LT |
8 | * Arnd Bergmann (arndb@de.ibm.com) |
9 | * Martin Schwidefsky (schwidefsky@de.ibm.com) | |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
1da177e4 LT |
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> | |
1da177e4 LT |
18 | #include <asm/cio.h> |
19 | #include <asm/delay.h> | |
20 | #include <asm/irq.h> | |
5a489b98 | 21 | #include <asm/irq_regs.h> |
e87bfe51 | 22 | #include <asm/setup.h> |
15e9b586 | 23 | #include <asm/reset.h> |
1da177e4 LT |
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" | |
15e9b586 | 31 | #include "../s390mach.h" |
1da177e4 LT |
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 | { | |
66a464db | 65 | cio_debug_msg_id = debug_register ("cio_msg", 16, 4, 16*sizeof (long)); |
1da177e4 LT |
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); | |
06fbcb10 | 70 | cio_debug_trace_id = debug_register ("cio_trace", 16, 4, 16); |
1da177e4 LT |
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); | |
66a464db | 75 | cio_debug_crw_id = debug_register ("cio_crw", 4, 4, 16*sizeof (long)); |
1da177e4 LT |
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 | */ | |
4d284cac | 125 | static int |
1da177e4 LT |
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. */ | |
a8237fc4 | 137 | if (tsch (tpi_info->schid, irb) != 0) |
1da177e4 LT |
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 (); | |
2ec22984 | 145 | spin_lock(sch->lock); |
1da177e4 LT |
146 | memcpy (&sch->schib.scsw, &irb->scsw, sizeof (struct scsw)); |
147 | if (sch->driver && sch->driver->irq) | |
148 | sch->driver->irq(&sch->dev); | |
2ec22984 | 149 | spin_unlock(sch->lock); |
1da177e4 | 150 | irq_exit (); |
1f194a4c | 151 | _local_bh_enable(); |
1da177e4 LT |
152 | return 1; |
153 | } | |
154 | ||
4d284cac | 155 | static int |
1da177e4 LT |
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 | ||
a8237fc4 | 165 | stsch (sch->schid, &sch->schib); |
1da177e4 LT |
166 | |
167 | CIO_MSG_EVENT(0, "cio_start: 'not oper' status for " | |
fb6958a5 CH |
168 | "subchannel 0.%x.%04x!\n", sch->schid.ssid, |
169 | sch->schid.sch_no); | |
1da177e4 LT |
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; | |
e0e32c8e | 196 | sch->orb.lpm = (lpm != 0) ? lpm : sch->lpm; |
347a8dc3 | 197 | #ifdef CONFIG_64BIT |
1da177e4 LT |
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); | |
a8237fc4 | 207 | ccode = ssch (sch->schid, &sch->orb); |
1da177e4 LT |
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 | { | |
0b642ede | 231 | return cio_start_key(sch, cpa, lpm, PAGE_DEFAULT_KEY); |
1da177e4 LT |
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 | ||
a8237fc4 | 246 | ccode = rsch (sch->schid); |
1da177e4 LT |
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 | */ | |
a8237fc4 | 286 | ccode = hsch (sch->schid); |
1da177e4 LT |
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 | */ | |
a8237fc4 | 321 | ccode = csch (sch->schid); |
1da177e4 LT |
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 | ||
a8237fc4 | 354 | ccode = xsch (sch->schid); |
1da177e4 LT |
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. */ | |
a8237fc4 | 362 | stsch (sch->schid, &sch->schib); |
1da177e4 LT |
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++) { | |
a8237fc4 | 384 | ccode = msch_err (sch->schid, &sch->schib); |
1da177e4 LT |
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 | ||
d7b5a4c9 CH |
417 | if (sch_is_pseudo_sch(sch)) |
418 | return -EINVAL; | |
a8237fc4 | 419 | ccode = stsch (sch->schid, &sch->schib); |
1da177e4 LT |
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) { | |
a8237fc4 | 437 | stsch (sch->schid, &sch->schib); |
1da177e4 LT |
438 | if (sch->schib.pmcw.ena) |
439 | break; | |
440 | } | |
441 | if (ret == -EBUSY) { | |
442 | struct irb irb; | |
a8237fc4 | 443 | if (tsch(sch->schid, &irb) != 0) |
1da177e4 LT |
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 | ||
d7b5a4c9 CH |
466 | if (sch_is_pseudo_sch(sch)) |
467 | return 0; | |
a8237fc4 | 468 | ccode = stsch (sch->schid, &sch->schib); |
1da177e4 LT |
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) { | |
a8237fc4 | 492 | stsch (sch->schid, &sch->schib); |
1da177e4 LT |
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 | ||
d7b5a4c9 | 502 | int cio_create_sch_lock(struct subchannel *sch) |
2ec22984 CH |
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 | ||
1da177e4 LT |
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 | |
a8237fc4 | 524 | cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid) |
1da177e4 LT |
525 | { |
526 | char dbf_txt[15]; | |
527 | int ccode; | |
2ec22984 | 528 | int err; |
1da177e4 | 529 | |
a8237fc4 | 530 | sprintf (dbf_txt, "valsch%x", schid.sch_no); |
1da177e4 LT |
531 | CIO_TRACE_EVENT (4, dbf_txt); |
532 | ||
533 | /* Nuke all fields. */ | |
534 | memset(sch, 0, sizeof(struct subchannel)); | |
535 | ||
2ec22984 CH |
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 | } | |
6ab4879a | 544 | mutex_init(&sch->reg_mutex); |
1da177e4 | 545 | /* Set a name for the subchannel */ |
fb6958a5 CH |
546 | snprintf (sch->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x", schid.ssid, |
547 | schid.sch_no); | |
1da177e4 LT |
548 | |
549 | /* | |
550 | * The first subchannel that is not-operational (ccode==3) | |
551 | * indicates that there aren't any more devices available. | |
fb6958a5 CH |
552 | * If stsch gets an exception, it means the current subchannel set |
553 | * is not valid. | |
1da177e4 | 554 | */ |
fb6958a5 | 555 | ccode = stsch_err (schid, &sch->schib); |
2ec22984 CH |
556 | if (ccode) { |
557 | err = (ccode == 3) ? -ENXIO : ccode; | |
558 | goto out; | |
559 | } | |
1da177e4 LT |
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, | |
fb6958a5 | 568 | "Subchannel 0.%x.%04x reports " |
1da177e4 | 569 | "non-I/O subchannel type %04X\n", |
fb6958a5 | 570 | sch->schid.ssid, sch->schid.sch_no, sch->st); |
1da177e4 | 571 | /* We stop here for non-io subchannels. */ |
2ec22984 CH |
572 | err = sch->st; |
573 | goto out; | |
1da177e4 LT |
574 | } |
575 | ||
576 | /* Initialization for io subchannels. */ | |
2ec22984 | 577 | if (!sch->schib.pmcw.dnv) { |
1da177e4 | 578 | /* io subchannel but device number is invalid. */ |
2ec22984 CH |
579 | err = -ENODEV; |
580 | goto out; | |
581 | } | |
1da177e4 | 582 | /* Devno is valid. */ |
fb6958a5 | 583 | if (is_blacklisted (sch->schid.ssid, sch->schib.pmcw.dev)) { |
1da177e4 LT |
584 | /* |
585 | * This device must not be known to Linux. So we simply | |
586 | * say that there is no device and return ENODEV. | |
587 | */ | |
347d59d7 | 588 | CIO_MSG_EVENT(4, "Blacklisted device detected " |
fb6958a5 CH |
589 | "at devno %04X, subchannel set %x\n", |
590 | sch->schib.pmcw.dev, sch->schid.ssid); | |
2ec22984 CH |
591 | err = -ENODEV; |
592 | goto out; | |
1da177e4 LT |
593 | } |
594 | sch->opm = 0xff; | |
fb6958a5 CH |
595 | if (!cio_is_console(sch->schid)) |
596 | chsc_validate_chpids(sch); | |
28bdc6f6 | 597 | sch->lpm = sch->schib.pmcw.pam & sch->opm; |
1da177e4 LT |
598 | |
599 | CIO_DEBUG(KERN_INFO, 0, | |
fb6958a5 | 600 | "Detected device %04x on subchannel 0.%x.%04X" |
1da177e4 | 601 | " - PIM = %02X, PAM = %02X, POM = %02X\n", |
fb6958a5 CH |
602 | sch->schib.pmcw.dev, sch->schid.ssid, |
603 | sch->schid.sch_no, sch->schib.pmcw.pim, | |
1da177e4 LT |
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; | |
2ec22984 CH |
620 | out: |
621 | if (!cio_is_console(schid)) | |
622 | kfree(sch->lock); | |
623 | sch->lock = NULL; | |
624 | return err; | |
1da177e4 LT |
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; | |
5a489b98 | 639 | struct pt_regs *old_regs; |
1da177e4 | 640 | |
5a489b98 | 641 | old_regs = set_irq_regs(regs); |
9d0a57cb | 642 | irq_enter(); |
1da177e4 LT |
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 | */ | |
d54853ef | 649 | account_ticks(S390_lowcore.int_clock); |
1da177e4 LT |
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) | |
2ec22984 | 667 | spin_lock(sch->lock); |
1da177e4 | 668 | /* Store interrupt response block to lowcore. */ |
a8237fc4 | 669 | if (tsch (tpi_info->schid, irb) == 0 && sch) { |
1da177e4 LT |
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) | |
2ec22984 | 678 | spin_unlock(sch->lock); |
1da177e4 LT |
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); | |
9d0a57cb | 687 | irq_exit(); |
5a489b98 | 688 | set_irq_regs(old_regs); |
1da177e4 LT |
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 { | |
2ec22984 | 717 | spin_unlock(console_subchannel.lock); |
1da177e4 LT |
718 | if (!cio_tpi()) |
719 | cpu_relax(); | |
2ec22984 | 720 | spin_lock(console_subchannel.lock); |
1da177e4 LT |
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 | |
f97a56fb CH |
729 | cio_test_for_console(struct subchannel_id schid, void *data) |
730 | { | |
fb6958a5 | 731 | if (stsch_err(schid, &console_subchannel.schib) != 0) |
f97a56fb CH |
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) | |
1da177e4 | 745 | { |
a8237fc4 | 746 | struct subchannel_id schid; |
1da177e4 | 747 | |
a8237fc4 | 748 | init_subchannel_id(&schid); |
1da177e4 LT |
749 | if (console_irq != -1) { |
750 | /* VM provided us with the irq number of the console. */ | |
a8237fc4 CH |
751 | schid.sch_no = console_irq; |
752 | if (stsch(schid, &console_subchannel.schib) != 0 || | |
1da177e4 LT |
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. */ | |
f97a56fb | 758 | for_each_subchannel(cio_test_for_console, NULL); |
1da177e4 LT |
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 | { | |
f97a56fb | 774 | int sch_no, ret; |
a8237fc4 | 775 | struct subchannel_id schid; |
1da177e4 LT |
776 | |
777 | if (xchg(&console_subchannel_in_use, 1) != 0) | |
778 | return ERR_PTR(-EBUSY); | |
f97a56fb CH |
779 | sch_no = cio_get_console_sch_no(); |
780 | if (sch_no == -1) { | |
1da177e4 LT |
781 | console_subchannel_in_use = 0; |
782 | return ERR_PTR(-ENODEV); | |
783 | } | |
784 | memset(&console_subchannel, 0, sizeof(struct subchannel)); | |
a8237fc4 | 785 | init_subchannel_id(&schid); |
f97a56fb | 786 | schid.sch_no = sch_no; |
a8237fc4 | 787 | ret = cio_validate_subchannel(&console_subchannel, schid); |
1da177e4 LT |
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 | |
a8237fc4 | 819 | cio_is_console(struct subchannel_id schid) |
1da177e4 LT |
820 | { |
821 | if (!console_subchannel_in_use) | |
822 | return 0; | |
a8237fc4 | 823 | return schid_equal(&schid, &console_subchannel.schid); |
1da177e4 LT |
824 | } |
825 | ||
826 | struct subchannel * | |
827 | cio_get_console_subchannel(void) | |
828 | { | |
829 | if (!console_subchannel_in_use) | |
d2c993d8 | 830 | return NULL; |
1da177e4 LT |
831 | return &console_subchannel; |
832 | } | |
833 | ||
834 | #endif | |
4d284cac | 835 | static int |
a8237fc4 | 836 | __disable_subchannel_easy(struct subchannel_id schid, struct schib *schib) |
1da177e4 LT |
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 | ||
d54853ef MS |
853 | /* we can't use the normal udelay here, since it enables external interrupts */ |
854 | ||
855 | static void udelay_reset(unsigned long usecs) | |
856 | { | |
857 | uint64_t start_cc, end_cc; | |
858 | ||
859 | asm volatile ("STCK %0" : "=m" (start_cc)); | |
860 | do { | |
861 | cpu_relax(); | |
862 | asm volatile ("STCK %0" : "=m" (end_cc)); | |
863 | } while (((end_cc - start_cc)/4096) < usecs); | |
864 | } | |
865 | ||
4d284cac | 866 | static int |
a8237fc4 | 867 | __clear_subchannel_easy(struct subchannel_id schid) |
1da177e4 LT |
868 | { |
869 | int retry; | |
870 | ||
871 | if (csch(schid)) | |
872 | return -ENODEV; | |
873 | for (retry=0;retry<20;retry++) { | |
874 | struct tpi_info ti; | |
875 | ||
876 | if (tpi(&ti)) { | |
a8237fc4 CH |
877 | tsch(ti.schid, (struct irb *)__LC_IRB); |
878 | if (schid_equal(&ti.schid, &schid)) | |
4c24da79 | 879 | return 0; |
1da177e4 | 880 | } |
d54853ef | 881 | udelay_reset(100); |
1da177e4 LT |
882 | } |
883 | return -EBUSY; | |
884 | } | |
885 | ||
a45e1414 MH |
886 | static int pgm_check_occured; |
887 | ||
888 | static void cio_reset_pgm_check_handler(void) | |
889 | { | |
890 | pgm_check_occured = 1; | |
891 | } | |
892 | ||
893 | static int stsch_reset(struct subchannel_id schid, volatile struct schib *addr) | |
894 | { | |
895 | int rc; | |
896 | ||
897 | pgm_check_occured = 0; | |
ab14de6c | 898 | s390_base_pgm_handler_fn = cio_reset_pgm_check_handler; |
6faf4444 | 899 | rc = stsch(schid, addr); |
ab14de6c | 900 | s390_base_pgm_handler_fn = NULL; |
aa77015c | 901 | |
ab14de6c | 902 | /* The program check handler could have changed pgm_check_occured. */ |
6faf4444 | 903 | barrier(); |
aa77015c | 904 | |
a45e1414 MH |
905 | if (pgm_check_occured) |
906 | return -EIO; | |
907 | else | |
908 | return rc; | |
909 | } | |
910 | ||
15e9b586 | 911 | static int __shutdown_subchannel_easy(struct subchannel_id schid, void *data) |
f97a56fb CH |
912 | { |
913 | struct schib schib; | |
914 | ||
a45e1414 | 915 | if (stsch_reset(schid, &schib)) |
f97a56fb CH |
916 | return -ENXIO; |
917 | if (!schib.pmcw.ena) | |
918 | return 0; | |
919 | switch(__disable_subchannel_easy(schid, &schib)) { | |
920 | case 0: | |
921 | case -ENODEV: | |
922 | break; | |
923 | default: /* -EBUSY */ | |
924 | if (__clear_subchannel_easy(schid)) | |
925 | break; /* give up... */ | |
926 | stsch(schid, &schib); | |
927 | __disable_subchannel_easy(schid, &schib); | |
928 | } | |
929 | return 0; | |
930 | } | |
1da177e4 | 931 | |
15e9b586 HC |
932 | static atomic_t chpid_reset_count; |
933 | ||
934 | static void s390_reset_chpids_mcck_handler(void) | |
935 | { | |
936 | struct crw crw; | |
937 | struct mci *mci; | |
938 | ||
939 | /* Check for pending channel report word. */ | |
940 | mci = (struct mci *)&S390_lowcore.mcck_interruption_code; | |
941 | if (!mci->cp) | |
942 | return; | |
943 | /* Process channel report words. */ | |
944 | while (stcrw(&crw) == 0) { | |
945 | /* Check for responses to RCHP. */ | |
946 | if (crw.slct && crw.rsc == CRW_RSC_CPATH) | |
947 | atomic_dec(&chpid_reset_count); | |
948 | } | |
949 | } | |
950 | ||
951 | #define RCHP_TIMEOUT (30 * USEC_PER_SEC) | |
952 | static void css_reset(void) | |
953 | { | |
954 | int i, ret; | |
955 | unsigned long long timeout; | |
956 | ||
957 | /* Reset subchannels. */ | |
958 | for_each_subchannel(__shutdown_subchannel_easy, NULL); | |
959 | /* Reset channel paths. */ | |
ab14de6c | 960 | s390_base_mcck_handler_fn = s390_reset_chpids_mcck_handler; |
15e9b586 HC |
961 | /* Enable channel report machine checks. */ |
962 | __ctl_set_bit(14, 28); | |
963 | /* Temporarily reenable machine checks. */ | |
964 | local_mcck_enable(); | |
965 | for (i = 0; i <= __MAX_CHPID; i++) { | |
966 | ret = rchp(i); | |
967 | if ((ret == 0) || (ret == 2)) | |
968 | /* | |
969 | * rchp either succeeded, or another rchp is already | |
970 | * in progress. In either case, we'll get a crw. | |
971 | */ | |
972 | atomic_inc(&chpid_reset_count); | |
973 | } | |
974 | /* Wait for machine check for all channel paths. */ | |
975 | timeout = get_clock() + (RCHP_TIMEOUT << 12); | |
976 | while (atomic_read(&chpid_reset_count) != 0) { | |
977 | if (get_clock() > timeout) | |
978 | break; | |
979 | cpu_relax(); | |
980 | } | |
981 | /* Disable machine checks again. */ | |
982 | local_mcck_disable(); | |
983 | /* Disable channel report machine checks. */ | |
984 | __ctl_clear_bit(14, 28); | |
ab14de6c | 985 | s390_base_mcck_handler_fn = NULL; |
15e9b586 HC |
986 | } |
987 | ||
988 | static struct reset_call css_reset_call = { | |
989 | .fn = css_reset, | |
990 | }; | |
991 | ||
992 | static int __init init_css_reset_call(void) | |
993 | { | |
994 | atomic_set(&chpid_reset_count, 0); | |
995 | register_reset_call(&css_reset_call); | |
996 | return 0; | |
997 | } | |
998 | ||
999 | arch_initcall(init_css_reset_call); | |
1000 | ||
1001 | struct sch_match_id { | |
1002 | struct subchannel_id schid; | |
1003 | struct ccw_dev_id devid; | |
1004 | int rc; | |
1005 | }; | |
1006 | ||
1007 | static int __reipl_subchannel_match(struct subchannel_id schid, void *data) | |
1008 | { | |
1009 | struct schib schib; | |
1010 | struct sch_match_id *match_id = data; | |
1011 | ||
a45e1414 | 1012 | if (stsch_reset(schid, &schib)) |
15e9b586 HC |
1013 | return -ENXIO; |
1014 | if (schib.pmcw.dnv && | |
1015 | (schib.pmcw.dev == match_id->devid.devno) && | |
1016 | (schid.ssid == match_id->devid.ssid)) { | |
1017 | match_id->schid = schid; | |
1018 | match_id->rc = 0; | |
1019 | return 1; | |
1020 | } | |
1021 | return 0; | |
1022 | } | |
1023 | ||
1024 | static int reipl_find_schid(struct ccw_dev_id *devid, | |
1025 | struct subchannel_id *schid) | |
1da177e4 | 1026 | { |
ff6b8ea6 MH |
1027 | struct sch_match_id match_id; |
1028 | ||
1029 | match_id.devid = *devid; | |
1030 | match_id.rc = -ENODEV; | |
15e9b586 | 1031 | for_each_subchannel(__reipl_subchannel_match, &match_id); |
ff6b8ea6 MH |
1032 | if (match_id.rc == 0) |
1033 | *schid = match_id.schid; | |
1034 | return match_id.rc; | |
1da177e4 LT |
1035 | } |
1036 | ||
ff6b8ea6 MH |
1037 | extern void do_reipl_asm(__u32 schid); |
1038 | ||
1da177e4 | 1039 | /* Make sure all subchannels are quiet before we re-ipl an lpar. */ |
ff6b8ea6 | 1040 | void reipl_ccw_dev(struct ccw_dev_id *devid) |
1da177e4 | 1041 | { |
ff6b8ea6 MH |
1042 | struct subchannel_id schid; |
1043 | ||
15e9b586 HC |
1044 | s390_reset_system(); |
1045 | if (reipl_find_schid(devid, &schid) != 0) | |
ff6b8ea6 | 1046 | panic("IPL Device not found\n"); |
ff6b8ea6 | 1047 | do_reipl_asm(*((__u32*)&schid)); |
1da177e4 | 1048 | } |
e87bfe51 HC |
1049 | |
1050 | extern struct schib ipl_schib; | |
1051 | ||
1052 | /* | |
1053 | * ipl_save_parameters gets called very early. It is not allowed to access | |
1054 | * anything in the bss section at all. The bss section is not cleared yet, | |
1055 | * but may contain some ipl parameters written by the firmware. | |
1056 | * These parameters (if present) are copied to 0x2000. | |
1057 | * To avoid corruption of the ipl parameters, all variables used by this | |
1058 | * function must reside on the stack or in the data section. | |
1059 | */ | |
1060 | void ipl_save_parameters(void) | |
1061 | { | |
1062 | struct subchannel_id schid; | |
1063 | unsigned int *ipl_ptr; | |
1064 | void *src, *dst; | |
1065 | ||
1066 | schid = *(struct subchannel_id *)__LC_SUBCHANNEL_ID; | |
1067 | if (!schid.one) | |
1068 | return; | |
1069 | if (stsch(schid, &ipl_schib)) | |
1070 | return; | |
1071 | if (!ipl_schib.pmcw.dnv) | |
1072 | return; | |
1073 | ipl_devno = ipl_schib.pmcw.dev; | |
1074 | ipl_flags |= IPL_DEVNO_VALID; | |
1075 | if (!ipl_schib.pmcw.qf) | |
1076 | return; | |
1077 | ipl_flags |= IPL_PARMBLOCK_VALID; | |
1078 | ipl_ptr = (unsigned int *)__LC_IPL_PARMBLOCK_PTR; | |
1079 | src = (void *)(unsigned long)*ipl_ptr; | |
1080 | dst = (void *)IPL_PARMBLOCK_ORIGIN; | |
1081 | memmove(dst, src, PAGE_SIZE); | |
1082 | *ipl_ptr = IPL_PARMBLOCK_ORIGIN; | |
1083 | } |