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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * drivers/s390/cio/cio.c
3 * S/390 common I/O routines -- low level i/o calls
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
Michael Holzheuaa770152006-12-28 00:35:36 +01005 * Copyright (C) IBM Corp. 1999,2006
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 * Author(s): Ingo Adlung (adlung@de.ibm.com)
Cornelia Huck4ce3b302006-01-14 13:21:04 -08007 * Cornelia Huck (cornelia.huck@de.ibm.com)
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 * Arnd Bergmann (arndb@de.ibm.com)
9 * Martin Schwidefsky (schwidefsky@de.ibm.com)
10 */
11
12#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#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 Torvalds1da177e2005-04-16 15:20:36 -070018#include <asm/cio.h>
19#include <asm/delay.h>
20#include <asm/irq.h>
Heiko Carstens5a489b92006-10-06 16:38:35 +020021#include <asm/irq_regs.h>
Heiko Carstense87bfe52006-09-20 15:59:15 +020022#include <asm/setup.h>
Heiko Carstens15e9b582006-12-04 15:40:26 +010023#include <asm/reset.h>
Michael Holzheu46b05d22007-02-21 10:55:21 +010024#include <asm/ipl.h>
Peter Oberparleitere5854a52007-04-27 16:01:31 +020025#include <asm/chpid.h>
Peter Oberparleiter4e8e56c2008-01-26 14:10:44 +010026#include <asm/airq.h>
Heiko Carstens43ca5c32008-04-17 07:46:23 +020027#include <asm/cpu.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include "cio.h"
29#include "css.h"
30#include "chsc.h"
31#include "ioasm.h"
Cornelia Huckcd6b4f22008-01-26 14:10:43 +010032#include "io_sch.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include "blacklist.h"
34#include "cio_debug.h"
Peter Oberparleitere6b6e102007-04-27 16:01:28 +020035#include "chp.h"
Heiko Carstens15e9b582006-12-04 15:40:26 +010036#include "../s390mach.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
38debug_info_t *cio_debug_msg_id;
39debug_info_t *cio_debug_trace_id;
40debug_info_t *cio_debug_crw_id;
41
Linus Torvalds1da177e2005-04-16 15:20:36 -070042/*
43 * Function: cio_debug_init
Cornelia Huckbc698bc2008-01-26 14:10:42 +010044 * Initializes three debug logs for common I/O:
45 * - cio_msg logs generic cio messages
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 * - cio_trace logs the calling of different functions
Cornelia Huckbc698bc2008-01-26 14:10:42 +010047 * - cio_crw logs machine check related cio messages
Linus Torvalds1da177e2005-04-16 15:20:36 -070048 */
Cornelia Huckbc698bc2008-01-26 14:10:42 +010049static int __init cio_debug_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070050{
Peter Tiedemann361f4942008-01-26 14:11:30 +010051 cio_debug_msg_id = debug_register("cio_msg", 16, 1, 16 * sizeof(long));
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 if (!cio_debug_msg_id)
53 goto out_unregister;
Cornelia Huckbc698bc2008-01-26 14:10:42 +010054 debug_register_view(cio_debug_msg_id, &debug_sprintf_view);
55 debug_set_level(cio_debug_msg_id, 2);
Peter Tiedemann361f4942008-01-26 14:11:30 +010056 cio_debug_trace_id = debug_register("cio_trace", 16, 1, 16);
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 if (!cio_debug_trace_id)
58 goto out_unregister;
Cornelia Huckbc698bc2008-01-26 14:10:42 +010059 debug_register_view(cio_debug_trace_id, &debug_hex_ascii_view);
60 debug_set_level(cio_debug_trace_id, 2);
Peter Tiedemann361f4942008-01-26 14:11:30 +010061 cio_debug_crw_id = debug_register("cio_crw", 16, 1, 16 * sizeof(long));
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 if (!cio_debug_crw_id)
63 goto out_unregister;
Cornelia Huckbc698bc2008-01-26 14:10:42 +010064 debug_register_view(cio_debug_crw_id, &debug_sprintf_view);
65 debug_set_level(cio_debug_crw_id, 4);
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 return 0;
67
68out_unregister:
69 if (cio_debug_msg_id)
Cornelia Huckbc698bc2008-01-26 14:10:42 +010070 debug_unregister(cio_debug_msg_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 if (cio_debug_trace_id)
Cornelia Huckbc698bc2008-01-26 14:10:42 +010072 debug_unregister(cio_debug_trace_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 if (cio_debug_crw_id)
Cornelia Huckbc698bc2008-01-26 14:10:42 +010074 debug_unregister(cio_debug_crw_id);
Cornelia Hucke556bbb2007-07-27 12:29:19 +020075 printk(KERN_WARNING"cio: could not initialize debugging\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 return -1;
77}
78
79arch_initcall (cio_debug_init);
80
81int
82cio_set_options (struct subchannel *sch, int flags)
83{
84 sch->options.suspend = (flags & DOIO_ALLOW_SUSPEND) != 0;
85 sch->options.prefetch = (flags & DOIO_DENY_PREFETCH) != 0;
86 sch->options.inter = (flags & DOIO_SUPPRESS_INTER) != 0;
87 return 0;
88}
89
90/* FIXME: who wants to use this? */
91int
92cio_get_options (struct subchannel *sch)
93{
94 int flags;
95
96 flags = 0;
97 if (sch->options.suspend)
98 flags |= DOIO_ALLOW_SUSPEND;
99 if (sch->options.prefetch)
100 flags |= DOIO_DENY_PREFETCH;
101 if (sch->options.inter)
102 flags |= DOIO_SUPPRESS_INTER;
103 return flags;
104}
105
106/*
107 * Use tpi to get a pending interrupt, call the interrupt handler and
108 * return a pointer to the subchannel structure.
109 */
Heiko Carstens4d284ca2007-02-05 21:18:53 +0100110static int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111cio_tpi(void)
112{
113 struct tpi_info *tpi_info;
114 struct subchannel *sch;
115 struct irb *irb;
116
117 tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID;
118 if (tpi (NULL) != 1)
119 return 0;
120 irb = (struct irb *) __LC_IRB;
121 /* Store interrupt response block to lowcore. */
Cornelia Hucka8237fc2006-01-06 00:19:21 -0800122 if (tsch (tpi_info->schid, irb) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 /* Not status pending or not operational. */
124 return 1;
125 sch = (struct subchannel *)(unsigned long)tpi_info->intparm;
126 if (!sch)
127 return 1;
128 local_bh_disable();
129 irq_enter ();
Cornelia Huck2ec22982006-12-08 15:54:26 +0100130 spin_lock(sch->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 memcpy (&sch->schib.scsw, &irb->scsw, sizeof (struct scsw));
132 if (sch->driver && sch->driver->irq)
Cornelia Huck602b20f2008-01-26 14:10:39 +0100133 sch->driver->irq(sch);
Cornelia Huck2ec22982006-12-08 15:54:26 +0100134 spin_unlock(sch->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 irq_exit ();
Heiko Carstens1f194a42006-07-03 00:24:46 -0700136 _local_bh_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 return 1;
138}
139
Heiko Carstens4d284ca2007-02-05 21:18:53 +0100140static int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141cio_start_handle_notoper(struct subchannel *sch, __u8 lpm)
142{
143 char dbf_text[15];
144
145 if (lpm != 0)
146 sch->lpm &= ~lpm;
147 else
148 sch->lpm = 0;
149
Cornelia Hucka8237fc2006-01-06 00:19:21 -0800150 stsch (sch->schid, &sch->schib);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
Michael Ernst139b83d2008-05-07 09:22:54 +0200152 CIO_MSG_EVENT(2, "cio_start: 'not oper' status for "
Cornelia Huckfb6958a2006-01-06 00:19:25 -0800153 "subchannel 0.%x.%04x!\n", sch->schid.ssid,
154 sch->schid.sch_no);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 sprintf(dbf_text, "no%s", sch->dev.bus_id);
156 CIO_TRACE_EVENT(0, dbf_text);
157 CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib));
158
159 return (sch->lpm ? -EACCES : -ENODEV);
160}
161
162int
163cio_start_key (struct subchannel *sch, /* subchannel structure */
164 struct ccw1 * cpa, /* logical channel prog addr */
165 __u8 lpm, /* logical path mask */
166 __u8 key) /* storage key */
167{
168 char dbf_txt[15];
169 int ccode;
Cornelia Huckcd6b4f22008-01-26 14:10:43 +0100170 struct orb *orb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171
Cornelia Huckcd6b4f22008-01-26 14:10:43 +0100172 CIO_TRACE_EVENT(4, "stIO");
173 CIO_TRACE_EVENT(4, sch->dev.bus_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174
Cornelia Huckcd6b4f22008-01-26 14:10:43 +0100175 orb = &to_io_private(sch)->orb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 /* sch is always under 2G. */
Cornelia Huckcd6b4f22008-01-26 14:10:43 +0100177 orb->intparm = (u32)(addr_t)sch;
178 orb->fmt = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179
Cornelia Huckcd6b4f22008-01-26 14:10:43 +0100180 orb->pfch = sch->options.prefetch == 0;
181 orb->spnd = sch->options.suspend;
182 orb->ssic = sch->options.suspend && sch->options.inter;
183 orb->lpm = (lpm != 0) ? lpm : sch->lpm;
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800184#ifdef CONFIG_64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 /*
186 * for 64 bit we always support 64 bit IDAWs with 4k page size only
187 */
Cornelia Huckcd6b4f22008-01-26 14:10:43 +0100188 orb->c64 = 1;
189 orb->i2k = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190#endif
Cornelia Huckcd6b4f22008-01-26 14:10:43 +0100191 orb->key = key >> 4;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 /* issue "Start Subchannel" */
Cornelia Huckcd6b4f22008-01-26 14:10:43 +0100193 orb->cpa = (__u32) __pa(cpa);
194 ccode = ssch(sch->schid, orb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195
196 /* process condition code */
Cornelia Huckcd6b4f22008-01-26 14:10:43 +0100197 sprintf(dbf_txt, "ccode:%d", ccode);
198 CIO_TRACE_EVENT(4, dbf_txt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199
200 switch (ccode) {
201 case 0:
202 /*
203 * initialize device status information
204 */
205 sch->schib.scsw.actl |= SCSW_ACTL_START_PEND;
206 return 0;
207 case 1: /* status pending */
208 case 2: /* busy */
209 return -EBUSY;
210 default: /* device/path not operational */
211 return cio_start_handle_notoper(sch, lpm);
212 }
213}
214
215int
216cio_start (struct subchannel *sch, struct ccw1 *cpa, __u8 lpm)
217{
Peter Oberparleiter0b642ed2005-05-01 08:58:58 -0700218 return cio_start_key(sch, cpa, lpm, PAGE_DEFAULT_KEY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219}
220
221/*
222 * resume suspended I/O operation
223 */
224int
225cio_resume (struct subchannel *sch)
226{
227 char dbf_txt[15];
228 int ccode;
229
230 CIO_TRACE_EVENT (4, "resIO");
231 CIO_TRACE_EVENT (4, sch->dev.bus_id);
232
Cornelia Hucka8237fc2006-01-06 00:19:21 -0800233 ccode = rsch (sch->schid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234
235 sprintf (dbf_txt, "ccode:%d", ccode);
236 CIO_TRACE_EVENT (4, dbf_txt);
237
238 switch (ccode) {
239 case 0:
240 sch->schib.scsw.actl |= SCSW_ACTL_RESUME_PEND;
241 return 0;
242 case 1:
243 return -EBUSY;
244 case 2:
245 return -EINVAL;
246 default:
247 /*
248 * useless to wait for request completion
249 * as device is no longer operational !
250 */
251 return -ENODEV;
252 }
253}
254
255/*
256 * halt I/O operation
257 */
258int
259cio_halt(struct subchannel *sch)
260{
261 char dbf_txt[15];
262 int ccode;
263
264 if (!sch)
265 return -ENODEV;
266
267 CIO_TRACE_EVENT (2, "haltIO");
268 CIO_TRACE_EVENT (2, sch->dev.bus_id);
269
270 /*
271 * Issue "Halt subchannel" and process condition code
272 */
Cornelia Hucka8237fc2006-01-06 00:19:21 -0800273 ccode = hsch (sch->schid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274
275 sprintf (dbf_txt, "ccode:%d", ccode);
276 CIO_TRACE_EVENT (2, dbf_txt);
277
278 switch (ccode) {
279 case 0:
280 sch->schib.scsw.actl |= SCSW_ACTL_HALT_PEND;
281 return 0;
282 case 1: /* status pending */
283 case 2: /* busy */
284 return -EBUSY;
285 default: /* device not operational */
286 return -ENODEV;
287 }
288}
289
290/*
291 * Clear I/O operation
292 */
293int
294cio_clear(struct subchannel *sch)
295{
296 char dbf_txt[15];
297 int ccode;
298
299 if (!sch)
300 return -ENODEV;
301
302 CIO_TRACE_EVENT (2, "clearIO");
303 CIO_TRACE_EVENT (2, sch->dev.bus_id);
304
305 /*
306 * Issue "Clear subchannel" and process condition code
307 */
Cornelia Hucka8237fc2006-01-06 00:19:21 -0800308 ccode = csch (sch->schid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309
310 sprintf (dbf_txt, "ccode:%d", ccode);
311 CIO_TRACE_EVENT (2, dbf_txt);
312
313 switch (ccode) {
314 case 0:
315 sch->schib.scsw.actl |= SCSW_ACTL_CLEAR_PEND;
316 return 0;
317 default: /* device not operational */
318 return -ENODEV;
319 }
320}
321
322/*
323 * Function: cio_cancel
324 * Issues a "Cancel Subchannel" on the specified subchannel
325 * Note: We don't need any fancy intparms and flags here
326 * since xsch is executed synchronously.
327 * Only for common I/O internal use as for now.
328 */
329int
330cio_cancel (struct subchannel *sch)
331{
332 char dbf_txt[15];
333 int ccode;
334
335 if (!sch)
336 return -ENODEV;
337
338 CIO_TRACE_EVENT (2, "cancelIO");
339 CIO_TRACE_EVENT (2, sch->dev.bus_id);
340
Cornelia Hucka8237fc2006-01-06 00:19:21 -0800341 ccode = xsch (sch->schid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342
343 sprintf (dbf_txt, "ccode:%d", ccode);
344 CIO_TRACE_EVENT (2, dbf_txt);
345
346 switch (ccode) {
347 case 0: /* success */
348 /* Update information in scsw. */
Cornelia Hucka8237fc2006-01-06 00:19:21 -0800349 stsch (sch->schid, &sch->schib);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 return 0;
351 case 1: /* status pending */
352 return -EBUSY;
353 case 2: /* not applicable */
354 return -EINVAL;
355 default: /* not oper */
356 return -ENODEV;
357 }
358}
359
360/*
361 * Function: cio_modify
362 * Issues a "Modify Subchannel" on the specified subchannel
363 */
364int
365cio_modify (struct subchannel *sch)
366{
367 int ccode, retry, ret;
368
369 ret = 0;
370 for (retry = 0; retry < 5; retry++) {
Cornelia Hucka8237fc2006-01-06 00:19:21 -0800371 ccode = msch_err (sch->schid, &sch->schib);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 if (ccode < 0) /* -EIO if msch gets a program check. */
373 return ccode;
374 switch (ccode) {
375 case 0: /* successfull */
376 return 0;
377 case 1: /* status pending */
378 return -EBUSY;
379 case 2: /* busy */
380 udelay (100); /* allow for recovery */
381 ret = -EBUSY;
382 break;
383 case 3: /* not operational */
384 return -ENODEV;
385 }
386 }
387 return ret;
388}
389
390/*
391 * Enable subchannel.
392 */
Cornelia Huckedf22092008-04-30 13:38:39 +0200393int cio_enable_subchannel(struct subchannel *sch, u32 intparm)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394{
395 char dbf_txt[15];
396 int ccode;
397 int retry;
398 int ret;
399
400 CIO_TRACE_EVENT (2, "ensch");
401 CIO_TRACE_EVENT (2, sch->dev.bus_id);
402
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +0100403 if (sch_is_pseudo_sch(sch))
404 return -EINVAL;
Cornelia Hucka8237fc2006-01-06 00:19:21 -0800405 ccode = stsch (sch->schid, &sch->schib);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 if (ccode)
407 return -ENODEV;
408
409 for (retry = 5, ret = 0; retry > 0; retry--) {
410 sch->schib.pmcw.ena = 1;
Cornelia Huckedf22092008-04-30 13:38:39 +0200411 sch->schib.pmcw.isc = sch->isc;
Cornelia Huckb279a4f2008-01-26 14:10:45 +0100412 sch->schib.pmcw.intparm = intparm;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 ret = cio_modify(sch);
414 if (ret == -ENODEV)
415 break;
416 if (ret == -EIO)
417 /*
418 * Got a program check in cio_modify. Try without
419 * the concurrent sense bit the next time.
420 */
421 sch->schib.pmcw.csense = 0;
422 if (ret == 0) {
Cornelia Hucka8237fc2006-01-06 00:19:21 -0800423 stsch (sch->schid, &sch->schib);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 if (sch->schib.pmcw.ena)
425 break;
426 }
427 if (ret == -EBUSY) {
428 struct irb irb;
Cornelia Hucka8237fc2006-01-06 00:19:21 -0800429 if (tsch(sch->schid, &irb) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 break;
431 }
432 }
433 sprintf (dbf_txt, "ret:%d", ret);
434 CIO_TRACE_EVENT (2, dbf_txt);
435 return ret;
436}
437
438/*
439 * Disable subchannel.
440 */
441int
442cio_disable_subchannel (struct subchannel *sch)
443{
444 char dbf_txt[15];
445 int ccode;
446 int retry;
447 int ret;
448
449 CIO_TRACE_EVENT (2, "dissch");
450 CIO_TRACE_EVENT (2, sch->dev.bus_id);
451
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +0100452 if (sch_is_pseudo_sch(sch))
453 return 0;
Cornelia Hucka8237fc2006-01-06 00:19:21 -0800454 ccode = stsch (sch->schid, &sch->schib);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 if (ccode == 3) /* Not operational. */
456 return -ENODEV;
457
458 if (sch->schib.scsw.actl != 0)
459 /*
460 * the disable function must not be called while there are
461 * requests pending for completion !
462 */
463 return -EBUSY;
464
465 for (retry = 5, ret = 0; retry > 0; retry--) {
466 sch->schib.pmcw.ena = 0;
467 ret = cio_modify(sch);
468 if (ret == -ENODEV)
469 break;
470 if (ret == -EBUSY)
471 /*
472 * The subchannel is busy or status pending.
473 * We'll disable when the next interrupt was delivered
474 * via the state machine.
475 */
476 break;
477 if (ret == 0) {
Cornelia Hucka8237fc2006-01-06 00:19:21 -0800478 stsch (sch->schid, &sch->schib);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 if (!sch->schib.pmcw.ena)
480 break;
481 }
482 }
483 sprintf (dbf_txt, "ret:%d", ret);
484 CIO_TRACE_EVENT (2, dbf_txt);
485 return ret;
486}
487
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +0100488int cio_create_sch_lock(struct subchannel *sch)
Cornelia Huck2ec22982006-12-08 15:54:26 +0100489{
490 sch->lock = kmalloc(sizeof(spinlock_t), GFP_KERNEL);
491 if (!sch->lock)
492 return -ENOMEM;
493 spin_lock_init(sch->lock);
494 return 0;
495}
496
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497/*
498 * cio_validate_subchannel()
499 *
500 * Find out subchannel type and initialize struct subchannel.
501 * Return codes:
502 * SUBCHANNEL_TYPE_IO for a normal io subchannel
503 * SUBCHANNEL_TYPE_CHSC for a chsc subchannel
504 * SUBCHANNEL_TYPE_MESSAGE for a messaging subchannel
505 * SUBCHANNEL_TYPE_ADM for a adm(?) subchannel
506 * -ENXIO for non-defined subchannels
507 * -ENODEV for subchannels with invalid device number or blacklisted devices
508 */
509int
Cornelia Hucka8237fc2006-01-06 00:19:21 -0800510cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511{
512 char dbf_txt[15];
513 int ccode;
Cornelia Huck2ec22982006-12-08 15:54:26 +0100514 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515
Cornelia Hucka8237fc2006-01-06 00:19:21 -0800516 sprintf (dbf_txt, "valsch%x", schid.sch_no);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 CIO_TRACE_EVENT (4, dbf_txt);
518
519 /* Nuke all fields. */
520 memset(sch, 0, sizeof(struct subchannel));
521
Cornelia Huck2ec22982006-12-08 15:54:26 +0100522 sch->schid = schid;
523 if (cio_is_console(schid)) {
524 sch->lock = cio_get_console_lock();
525 } else {
526 err = cio_create_sch_lock(sch);
527 if (err)
528 goto out;
529 }
Cornelia Huck6ab48792006-07-12 16:39:50 +0200530 mutex_init(&sch->reg_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 /* Set a name for the subchannel */
Cornelia Huckfb6958a2006-01-06 00:19:25 -0800532 snprintf (sch->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x", schid.ssid,
533 schid.sch_no);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534
535 /*
536 * The first subchannel that is not-operational (ccode==3)
537 * indicates that there aren't any more devices available.
Cornelia Huckfb6958a2006-01-06 00:19:25 -0800538 * If stsch gets an exception, it means the current subchannel set
539 * is not valid.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 */
Cornelia Huckfb6958a2006-01-06 00:19:25 -0800541 ccode = stsch_err (schid, &sch->schib);
Cornelia Huck2ec22982006-12-08 15:54:26 +0100542 if (ccode) {
543 err = (ccode == 3) ? -ENXIO : ccode;
544 goto out;
545 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 /* Copy subchannel type from path management control word. */
547 sch->st = sch->schib.pmcw.st;
548
549 /*
550 * ... just being curious we check for non I/O subchannels
551 */
552 if (sch->st != 0) {
Michael Ernst139b83d2008-05-07 09:22:54 +0200553 CIO_MSG_EVENT(4, "Subchannel 0.%x.%04x reports "
554 "non-I/O subchannel type %04X\n",
555 sch->schid.ssid, sch->schid.sch_no, sch->st);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 /* We stop here for non-io subchannels. */
Cornelia Huck2ec22982006-12-08 15:54:26 +0100557 err = sch->st;
558 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 }
560
561 /* Initialization for io subchannels. */
Michael Ernst808e4882008-01-26 14:10:51 +0100562 if (!css_sch_is_valid(&sch->schib)) {
563 err = -ENODEV;
564 goto out;
565 }
566
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 /* Devno is valid. */
Cornelia Huckfb6958a2006-01-06 00:19:25 -0800568 if (is_blacklisted (sch->schid.ssid, sch->schib.pmcw.dev)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 /*
570 * This device must not be known to Linux. So we simply
571 * say that there is no device and return ENODEV.
572 */
Michael Ernst139b83d2008-05-07 09:22:54 +0200573 CIO_MSG_EVENT(6, "Blacklisted device detected "
Cornelia Huckfb6958a2006-01-06 00:19:25 -0800574 "at devno %04X, subchannel set %x\n",
575 sch->schib.pmcw.dev, sch->schid.ssid);
Cornelia Huck2ec22982006-12-08 15:54:26 +0100576 err = -ENODEV;
577 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 }
Cornelia Huck85b0d7c2008-06-10 10:03:21 +0200579 if (cio_is_console(sch->schid)) {
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200580 sch->opm = 0xff;
Cornelia Huck85b0d7c2008-06-10 10:03:21 +0200581 sch->isc = 1;
582 } else {
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200583 sch->opm = chp_get_sch_opm(sch);
Cornelia Huck85b0d7c2008-06-10 10:03:21 +0200584 sch->isc = 3;
585 }
Peter Oberparleiter28bdc6f2006-09-20 15:59:59 +0200586 sch->lpm = sch->schib.pmcw.pam & sch->opm;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587
Michael Ernst139b83d2008-05-07 09:22:54 +0200588 CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X "
589 "- PIM = %02X, PAM = %02X, POM = %02X\n",
590 sch->schib.pmcw.dev, sch->schid.ssid,
591 sch->schid.sch_no, sch->schib.pmcw.pim,
592 sch->schib.pmcw.pam, sch->schib.pmcw.pom);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593
594 /*
595 * We now have to initially ...
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 * ... enable "concurrent sense"
597 * ... enable "multipath mode" if more than one
598 * CHPID is available. This is done regardless
599 * whether multiple paths are available for us.
600 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 sch->schib.pmcw.csense = 1; /* concurrent sense */
602 sch->schib.pmcw.ena = 0;
603 if ((sch->lpm & (sch->lpm - 1)) != 0)
604 sch->schib.pmcw.mp = 1; /* multipath mode */
Cornelia Huck1842f2b2007-10-12 16:11:22 +0200605 /* clean up possible residual cmf stuff */
606 sch->schib.pmcw.mme = 0;
607 sch->schib.pmcw.mbfc = 0;
608 sch->schib.pmcw.mbi = 0;
609 sch->schib.mba = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 return 0;
Cornelia Huck2ec22982006-12-08 15:54:26 +0100611out:
612 if (!cio_is_console(schid))
613 kfree(sch->lock);
614 sch->lock = NULL;
615 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616}
617
618/*
619 * do_IRQ() handles all normal I/O device IRQ's (the special
620 * SMP cross-CPU interrupts have their own specific
621 * handlers).
622 *
623 */
624void
625do_IRQ (struct pt_regs *regs)
626{
627 struct tpi_info *tpi_info;
628 struct subchannel *sch;
629 struct irb *irb;
Heiko Carstens5a489b92006-10-06 16:38:35 +0200630 struct pt_regs *old_regs;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631
Heiko Carstens5a489b92006-10-06 16:38:35 +0200632 old_regs = set_irq_regs(regs);
Heiko Carstens9d0a57c2006-10-11 15:31:26 +0200633 irq_enter();
Heiko Carstens43ca5c32008-04-17 07:46:23 +0200634 s390_idle_check();
Heiko Carstens5a62b192008-04-17 07:46:25 +0200635 if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator)
636 /* Serve timer interrupts first. */
637 clock_comparator_work();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 /*
639 * Get interrupt information from lowcore
640 */
641 tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID;
642 irb = (struct irb *) __LC_IRB;
643 do {
644 kstat_cpu(smp_processor_id()).irqs[IO_INTERRUPT]++;
645 /*
646 * Non I/O-subchannel thin interrupts are processed differently
647 */
648 if (tpi_info->adapter_IO == 1 &&
649 tpi_info->int_type == IO_INTERRUPT_TYPE) {
650 do_adapter_IO();
651 continue;
652 }
653 sch = (struct subchannel *)(unsigned long)tpi_info->intparm;
Heiko Carstensa8061702008-04-17 07:46:26 +0200654 if (!sch) {
655 /* Clear pending interrupt condition. */
656 tsch(tpi_info->schid, irb);
657 continue;
658 }
659 spin_lock(sch->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 /* Store interrupt response block to lowcore. */
Heiko Carstensa8061702008-04-17 07:46:26 +0200661 if (tsch(tpi_info->schid, irb) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662 /* Keep subchannel information word up to date. */
663 memcpy (&sch->schib.scsw, &irb->scsw,
664 sizeof (irb->scsw));
665 /* Call interrupt handler if there is one. */
666 if (sch->driver && sch->driver->irq)
Cornelia Huck602b20f2008-01-26 14:10:39 +0100667 sch->driver->irq(sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 }
Heiko Carstensa8061702008-04-17 07:46:26 +0200669 spin_unlock(sch->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670 /*
671 * Are more interrupts pending?
672 * If so, the tpi instruction will update the lowcore
673 * to hold the info for the next interrupt.
674 * We don't do this for VM because a tpi drops the cpu
675 * out of the sie which costs more cycles than it saves.
676 */
677 } while (!MACHINE_IS_VM && tpi (NULL) != 0);
Heiko Carstens9d0a57c2006-10-11 15:31:26 +0200678 irq_exit();
Heiko Carstens5a489b92006-10-06 16:38:35 +0200679 set_irq_regs(old_regs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680}
681
682#ifdef CONFIG_CCW_CONSOLE
683static struct subchannel console_subchannel;
Cornelia Huckcd6b4f22008-01-26 14:10:43 +0100684static struct io_subchannel_private console_priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685static int console_subchannel_in_use;
686
Cornelia Huckcd6b4f22008-01-26 14:10:43 +0100687void *cio_get_console_priv(void)
688{
689 return &console_priv;
690}
691
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692/*
693 * busy wait for the next interrupt on the console
694 */
Heiko Carstensa8061702008-04-17 07:46:26 +0200695void wait_cons_dev(void)
696 __releases(console_subchannel.lock)
697 __acquires(console_subchannel.lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698{
699 unsigned long cr6 __attribute__ ((aligned (8)));
700 unsigned long save_cr6 __attribute__ ((aligned (8)));
701
702 /*
703 * before entering the spinlock we may already have
704 * processed the interrupt on a different CPU...
705 */
706 if (!console_subchannel_in_use)
707 return;
708
Cornelia Huck85b0d7c2008-06-10 10:03:21 +0200709 /* disable all but isc 1 (console device) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 __ctl_store (save_cr6, 6, 6);
Cornelia Huck85b0d7c2008-06-10 10:03:21 +0200711 cr6 = 0x40000000;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712 __ctl_load (cr6, 6, 6);
713
714 do {
Cornelia Huck2ec22982006-12-08 15:54:26 +0100715 spin_unlock(console_subchannel.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 if (!cio_tpi())
717 cpu_relax();
Cornelia Huck2ec22982006-12-08 15:54:26 +0100718 spin_lock(console_subchannel.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719 } while (console_subchannel.schib.scsw.actl != 0);
720 /*
721 * restore previous isc value
722 */
723 __ctl_load (save_cr6, 6, 6);
724}
725
726static int
Cornelia Huckf97a56f2006-01-06 00:19:22 -0800727cio_test_for_console(struct subchannel_id schid, void *data)
728{
Cornelia Huckfb6958a2006-01-06 00:19:25 -0800729 if (stsch_err(schid, &console_subchannel.schib) != 0)
Cornelia Huckf97a56f2006-01-06 00:19:22 -0800730 return -ENXIO;
Cornelia Huckb279a4f2008-01-26 14:10:45 +0100731 if ((console_subchannel.schib.pmcw.st == SUBCHANNEL_TYPE_IO) &&
732 console_subchannel.schib.pmcw.dnv &&
733 (console_subchannel.schib.pmcw.dev == console_devno)) {
Cornelia Huckf97a56f2006-01-06 00:19:22 -0800734 console_irq = schid.sch_no;
735 return 1; /* found */
736 }
737 return 0;
738}
739
740
741static int
742cio_get_console_sch_no(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743{
Cornelia Hucka8237fc2006-01-06 00:19:21 -0800744 struct subchannel_id schid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745
Cornelia Hucka8237fc2006-01-06 00:19:21 -0800746 init_subchannel_id(&schid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 if (console_irq != -1) {
748 /* VM provided us with the irq number of the console. */
Cornelia Hucka8237fc2006-01-06 00:19:21 -0800749 schid.sch_no = console_irq;
750 if (stsch(schid, &console_subchannel.schib) != 0 ||
Cornelia Huckb279a4f2008-01-26 14:10:45 +0100751 (console_subchannel.schib.pmcw.st != SUBCHANNEL_TYPE_IO) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 !console_subchannel.schib.pmcw.dnv)
753 return -1;
754 console_devno = console_subchannel.schib.pmcw.dev;
755 } else if (console_devno != -1) {
756 /* At least the console device number is known. */
Cornelia Huckf97a56f2006-01-06 00:19:22 -0800757 for_each_subchannel(cio_test_for_console, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758 if (console_irq == -1)
759 return -1;
760 } else {
761 /* unlike in 2.4, we cannot autoprobe here, since
762 * the channel subsystem is not fully initialized.
763 * With some luck, the HWC console can take over */
Cornelia Hucke556bbb2007-07-27 12:29:19 +0200764 printk(KERN_WARNING "cio: No ccw console found!\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765 return -1;
766 }
767 return console_irq;
768}
769
770struct subchannel *
771cio_probe_console(void)
772{
Cornelia Huckf97a56f2006-01-06 00:19:22 -0800773 int sch_no, ret;
Cornelia Hucka8237fc2006-01-06 00:19:21 -0800774 struct subchannel_id schid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775
776 if (xchg(&console_subchannel_in_use, 1) != 0)
777 return ERR_PTR(-EBUSY);
Cornelia Huckf97a56f2006-01-06 00:19:22 -0800778 sch_no = cio_get_console_sch_no();
779 if (sch_no == -1) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780 console_subchannel_in_use = 0;
781 return ERR_PTR(-ENODEV);
782 }
783 memset(&console_subchannel, 0, sizeof(struct subchannel));
Cornelia Hucka8237fc2006-01-06 00:19:21 -0800784 init_subchannel_id(&schid);
Cornelia Huckf97a56f2006-01-06 00:19:22 -0800785 schid.sch_no = sch_no;
Cornelia Hucka8237fc2006-01-06 00:19:21 -0800786 ret = cio_validate_subchannel(&console_subchannel, schid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787 if (ret) {
788 console_subchannel_in_use = 0;
789 return ERR_PTR(-ENODEV);
790 }
791
792 /*
Cornelia Huck85b0d7c2008-06-10 10:03:21 +0200793 * enable console I/O-interrupt subclass 1
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794 */
Cornelia Huck85b0d7c2008-06-10 10:03:21 +0200795 ctl_set_bit(6, 30);
796 console_subchannel.isc = 1;
797 console_subchannel.schib.pmcw.isc = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 console_subchannel.schib.pmcw.intparm =
Cornelia Huckcd6b4f22008-01-26 14:10:43 +0100799 (u32)(addr_t)&console_subchannel;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800 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
808void
809cio_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. */
818int
Cornelia Hucka8237fc2006-01-06 00:19:21 -0800819cio_is_console(struct subchannel_id schid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820{
821 if (!console_subchannel_in_use)
822 return 0;
Cornelia Hucka8237fc2006-01-06 00:19:21 -0800823 return schid_equal(&schid, &console_subchannel.schid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824}
825
826struct subchannel *
827cio_get_console_subchannel(void)
828{
829 if (!console_subchannel_in_use)
Heiko Carstensd2c993d2006-07-12 16:41:55 +0200830 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831 return &console_subchannel;
832}
833
834#endif
Heiko Carstens4d284ca2007-02-05 21:18:53 +0100835static int
Cornelia Hucka8237fc2006-01-06 00:19:21 -0800836__disable_subchannel_easy(struct subchannel_id schid, struct schib *schib)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837{
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
Martin Schwidefskyd54853e2007-02-05 21:18:19 +0100853/* we can't use the normal udelay here, since it enables external interrupts */
854
855static 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
Heiko Carstens4d284ca2007-02-05 21:18:53 +0100866static int
Cornelia Hucka8237fc2006-01-06 00:19:21 -0800867__clear_subchannel_easy(struct subchannel_id schid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868{
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)) {
Cornelia Hucka8237fc2006-01-06 00:19:21 -0800877 tsch(ti.schid, (struct irb *)__LC_IRB);
878 if (schid_equal(&ti.schid, &schid))
Cornelia Huck4c24da72005-09-03 15:58:01 -0700879 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880 }
Martin Schwidefskyd54853e2007-02-05 21:18:19 +0100881 udelay_reset(100);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882 }
883 return -EBUSY;
884}
885
Michael Holzheua45e1412006-12-15 17:18:22 +0100886static int pgm_check_occured;
887
888static void cio_reset_pgm_check_handler(void)
889{
890 pgm_check_occured = 1;
891}
892
893static int stsch_reset(struct subchannel_id schid, volatile struct schib *addr)
894{
895 int rc;
896
897 pgm_check_occured = 0;
Heiko Carstensab14de62007-02-05 21:18:37 +0100898 s390_base_pgm_handler_fn = cio_reset_pgm_check_handler;
Heiko Carstens6faf4442007-01-09 10:18:41 +0100899 rc = stsch(schid, addr);
Heiko Carstensab14de62007-02-05 21:18:37 +0100900 s390_base_pgm_handler_fn = NULL;
Heiko Carstens6faf4442007-01-09 10:18:41 +0100901
Heiko Carstensab14de62007-02-05 21:18:37 +0100902 /* The program check handler could have changed pgm_check_occured. */
Heiko Carstens6faf4442007-01-09 10:18:41 +0100903 barrier();
904
Michael Holzheua45e1412006-12-15 17:18:22 +0100905 if (pgm_check_occured)
906 return -EIO;
907 else
908 return rc;
909}
910
Heiko Carstens15e9b582006-12-04 15:40:26 +0100911static int __shutdown_subchannel_easy(struct subchannel_id schid, void *data)
Cornelia Huckf97a56f2006-01-06 00:19:22 -0800912{
913 struct schib schib;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914
Michael Holzheua45e1412006-12-15 17:18:22 +0100915 if (stsch_reset(schid, &schib))
Cornelia Huckf97a56f2006-01-06 00:19:22 -0800916 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}
931
Heiko Carstens15e9b582006-12-04 15:40:26 +0100932static atomic_t chpid_reset_count;
933
934static 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)
952static void css_reset(void)
953{
954 int i, ret;
955 unsigned long long timeout;
Peter Oberparleiterf86635f2007-04-27 16:01:26 +0200956 struct chp_id chpid;
Heiko Carstens15e9b582006-12-04 15:40:26 +0100957
958 /* Reset subchannels. */
959 for_each_subchannel(__shutdown_subchannel_easy, NULL);
960 /* Reset channel paths. */
Heiko Carstensab14de62007-02-05 21:18:37 +0100961 s390_base_mcck_handler_fn = s390_reset_chpids_mcck_handler;
Heiko Carstens15e9b582006-12-04 15:40:26 +0100962 /* Enable channel report machine checks. */
963 __ctl_set_bit(14, 28);
964 /* Temporarily reenable machine checks. */
965 local_mcck_enable();
Peter Oberparleiterf86635f2007-04-27 16:01:26 +0200966 chp_id_init(&chpid);
Heiko Carstens15e9b582006-12-04 15:40:26 +0100967 for (i = 0; i <= __MAX_CHPID; i++) {
Peter Oberparleiterf86635f2007-04-27 16:01:26 +0200968 chpid.id = i;
969 ret = rchp(chpid);
Heiko Carstens15e9b582006-12-04 15:40:26 +0100970 if ((ret == 0) || (ret == 2))
971 /*
972 * rchp either succeeded, or another rchp is already
973 * in progress. In either case, we'll get a crw.
974 */
975 atomic_inc(&chpid_reset_count);
976 }
977 /* Wait for machine check for all channel paths. */
978 timeout = get_clock() + (RCHP_TIMEOUT << 12);
979 while (atomic_read(&chpid_reset_count) != 0) {
980 if (get_clock() > timeout)
981 break;
982 cpu_relax();
983 }
984 /* Disable machine checks again. */
985 local_mcck_disable();
986 /* Disable channel report machine checks. */
987 __ctl_clear_bit(14, 28);
Heiko Carstensab14de62007-02-05 21:18:37 +0100988 s390_base_mcck_handler_fn = NULL;
Heiko Carstens15e9b582006-12-04 15:40:26 +0100989}
990
991static struct reset_call css_reset_call = {
992 .fn = css_reset,
993};
994
995static int __init init_css_reset_call(void)
996{
997 atomic_set(&chpid_reset_count, 0);
998 register_reset_call(&css_reset_call);
999 return 0;
1000}
1001
1002arch_initcall(init_css_reset_call);
1003
1004struct sch_match_id {
1005 struct subchannel_id schid;
1006 struct ccw_dev_id devid;
1007 int rc;
1008};
1009
1010static int __reipl_subchannel_match(struct subchannel_id schid, void *data)
1011{
1012 struct schib schib;
1013 struct sch_match_id *match_id = data;
1014
Michael Holzheua45e1412006-12-15 17:18:22 +01001015 if (stsch_reset(schid, &schib))
Heiko Carstens15e9b582006-12-04 15:40:26 +01001016 return -ENXIO;
Cornelia Huckb279a4f2008-01-26 14:10:45 +01001017 if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv &&
Heiko Carstens15e9b582006-12-04 15:40:26 +01001018 (schib.pmcw.dev == match_id->devid.devno) &&
1019 (schid.ssid == match_id->devid.ssid)) {
1020 match_id->schid = schid;
1021 match_id->rc = 0;
1022 return 1;
1023 }
1024 return 0;
1025}
1026
1027static int reipl_find_schid(struct ccw_dev_id *devid,
1028 struct subchannel_id *schid)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029{
Michael Holzheuff6b8ea2006-09-20 15:58:49 +02001030 struct sch_match_id match_id;
1031
1032 match_id.devid = *devid;
1033 match_id.rc = -ENODEV;
Heiko Carstens15e9b582006-12-04 15:40:26 +01001034 for_each_subchannel(__reipl_subchannel_match, &match_id);
Michael Holzheuff6b8ea2006-09-20 15:58:49 +02001035 if (match_id.rc == 0)
1036 *schid = match_id.schid;
1037 return match_id.rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038}
1039
Michael Holzheuff6b8ea2006-09-20 15:58:49 +02001040extern void do_reipl_asm(__u32 schid);
1041
1042/* Make sure all subchannels are quiet before we re-ipl an lpar. */
1043void reipl_ccw_dev(struct ccw_dev_id *devid)
1044{
1045 struct subchannel_id schid;
1046
Heiko Carstens15e9b582006-12-04 15:40:26 +01001047 s390_reset_system();
1048 if (reipl_find_schid(devid, &schid) != 0)
Michael Holzheuff6b8ea2006-09-20 15:58:49 +02001049 panic("IPL Device not found\n");
Michael Holzheuff6b8ea2006-09-20 15:58:49 +02001050 do_reipl_asm(*((__u32*)&schid));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001051}
Heiko Carstense87bfe52006-09-20 15:59:15 +02001052
Heiko Carstens6fc321f2007-04-27 16:01:25 +02001053int __init cio_get_iplinfo(struct cio_iplinfo *iplinfo)
Heiko Carstense87bfe52006-09-20 15:59:15 +02001054{
1055 struct subchannel_id schid;
Heiko Carstens6fc321f2007-04-27 16:01:25 +02001056 struct schib schib;
Heiko Carstense87bfe52006-09-20 15:59:15 +02001057
1058 schid = *(struct subchannel_id *)__LC_SUBCHANNEL_ID;
1059 if (!schid.one)
Heiko Carstens6fc321f2007-04-27 16:01:25 +02001060 return -ENODEV;
1061 if (stsch(schid, &schib))
1062 return -ENODEV;
Cornelia Huckb279a4f2008-01-26 14:10:45 +01001063 if (schib.pmcw.st != SUBCHANNEL_TYPE_IO)
1064 return -ENODEV;
Heiko Carstens6fc321f2007-04-27 16:01:25 +02001065 if (!schib.pmcw.dnv)
1066 return -ENODEV;
1067 iplinfo->devno = schib.pmcw.dev;
1068 iplinfo->is_qdio = schib.pmcw.qf;
1069 return 0;
Heiko Carstense87bfe52006-09-20 15:59:15 +02001070}