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Commit | Line | Data |
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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> |
46b05d26 | 24 | #include <asm/ipl.h> |
e5854a58 | 25 | #include <asm/chpid.h> |
1da177e4 LT |
26 | #include "airq.h" |
27 | #include "cio.h" | |
28 | #include "css.h" | |
29 | #include "chsc.h" | |
30 | #include "ioasm.h" | |
31 | #include "blacklist.h" | |
32 | #include "cio_debug.h" | |
e6b6e10a | 33 | #include "chp.h" |
15e9b586 | 34 | #include "../s390mach.h" |
1da177e4 LT |
35 | |
36 | debug_info_t *cio_debug_msg_id; | |
37 | debug_info_t *cio_debug_trace_id; | |
38 | debug_info_t *cio_debug_crw_id; | |
39 | ||
40 | int cio_show_msg; | |
41 | ||
42 | static int __init | |
43 | cio_setup (char *parm) | |
44 | { | |
45 | if (!strcmp (parm, "yes")) | |
46 | cio_show_msg = 1; | |
47 | else if (!strcmp (parm, "no")) | |
48 | cio_show_msg = 0; | |
49 | else | |
e556bbbd CH |
50 | printk(KERN_ERR "cio: cio_setup: " |
51 | "invalid cio_msg parameter '%s'", parm); | |
1da177e4 LT |
52 | return 1; |
53 | } | |
54 | ||
55 | __setup ("cio_msg=", cio_setup); | |
56 | ||
57 | /* | |
58 | * Function: cio_debug_init | |
59 | * Initializes three debug logs (under /proc/s390dbf) for common I/O: | |
60 | * - cio_msg logs the messages which are printk'ed when CONFIG_DEBUG_IO is on | |
61 | * - cio_trace logs the calling of different functions | |
62 | * - cio_crw logs the messages which are printk'ed when CONFIG_DEBUG_CRW is on | |
63 | * debug levels depend on CONFIG_DEBUG_IO resp. CONFIG_DEBUG_CRW | |
64 | */ | |
65 | static int __init | |
66 | cio_debug_init (void) | |
67 | { | |
66a464db | 68 | cio_debug_msg_id = debug_register ("cio_msg", 16, 4, 16*sizeof (long)); |
1da177e4 LT |
69 | if (!cio_debug_msg_id) |
70 | goto out_unregister; | |
71 | debug_register_view (cio_debug_msg_id, &debug_sprintf_view); | |
72 | debug_set_level (cio_debug_msg_id, 2); | |
06fbcb10 | 73 | cio_debug_trace_id = debug_register ("cio_trace", 16, 4, 16); |
1da177e4 LT |
74 | if (!cio_debug_trace_id) |
75 | goto out_unregister; | |
76 | debug_register_view (cio_debug_trace_id, &debug_hex_ascii_view); | |
77 | debug_set_level (cio_debug_trace_id, 2); | |
66a464db | 78 | cio_debug_crw_id = debug_register ("cio_crw", 4, 4, 16*sizeof (long)); |
1da177e4 LT |
79 | if (!cio_debug_crw_id) |
80 | goto out_unregister; | |
81 | debug_register_view (cio_debug_crw_id, &debug_sprintf_view); | |
82 | debug_set_level (cio_debug_crw_id, 2); | |
1da177e4 LT |
83 | return 0; |
84 | ||
85 | out_unregister: | |
86 | if (cio_debug_msg_id) | |
87 | debug_unregister (cio_debug_msg_id); | |
88 | if (cio_debug_trace_id) | |
89 | debug_unregister (cio_debug_trace_id); | |
90 | if (cio_debug_crw_id) | |
91 | debug_unregister (cio_debug_crw_id); | |
e556bbbd | 92 | printk(KERN_WARNING"cio: could not initialize debugging\n"); |
1da177e4 LT |
93 | return -1; |
94 | } | |
95 | ||
96 | arch_initcall (cio_debug_init); | |
97 | ||
98 | int | |
99 | cio_set_options (struct subchannel *sch, int flags) | |
100 | { | |
101 | sch->options.suspend = (flags & DOIO_ALLOW_SUSPEND) != 0; | |
102 | sch->options.prefetch = (flags & DOIO_DENY_PREFETCH) != 0; | |
103 | sch->options.inter = (flags & DOIO_SUPPRESS_INTER) != 0; | |
104 | return 0; | |
105 | } | |
106 | ||
107 | /* FIXME: who wants to use this? */ | |
108 | int | |
109 | cio_get_options (struct subchannel *sch) | |
110 | { | |
111 | int flags; | |
112 | ||
113 | flags = 0; | |
114 | if (sch->options.suspend) | |
115 | flags |= DOIO_ALLOW_SUSPEND; | |
116 | if (sch->options.prefetch) | |
117 | flags |= DOIO_DENY_PREFETCH; | |
118 | if (sch->options.inter) | |
119 | flags |= DOIO_SUPPRESS_INTER; | |
120 | return flags; | |
121 | } | |
122 | ||
123 | /* | |
124 | * Use tpi to get a pending interrupt, call the interrupt handler and | |
125 | * return a pointer to the subchannel structure. | |
126 | */ | |
4d284cac | 127 | static int |
1da177e4 LT |
128 | cio_tpi(void) |
129 | { | |
130 | struct tpi_info *tpi_info; | |
131 | struct subchannel *sch; | |
132 | struct irb *irb; | |
133 | ||
134 | tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID; | |
135 | if (tpi (NULL) != 1) | |
136 | return 0; | |
137 | irb = (struct irb *) __LC_IRB; | |
138 | /* Store interrupt response block to lowcore. */ | |
a8237fc4 | 139 | if (tsch (tpi_info->schid, irb) != 0) |
1da177e4 LT |
140 | /* Not status pending or not operational. */ |
141 | return 1; | |
142 | sch = (struct subchannel *)(unsigned long)tpi_info->intparm; | |
143 | if (!sch) | |
144 | return 1; | |
145 | local_bh_disable(); | |
146 | irq_enter (); | |
2ec22984 | 147 | spin_lock(sch->lock); |
1da177e4 LT |
148 | memcpy (&sch->schib.scsw, &irb->scsw, sizeof (struct scsw)); |
149 | if (sch->driver && sch->driver->irq) | |
602b20f2 | 150 | sch->driver->irq(sch); |
2ec22984 | 151 | spin_unlock(sch->lock); |
1da177e4 | 152 | irq_exit (); |
1f194a4c | 153 | _local_bh_enable(); |
1da177e4 LT |
154 | return 1; |
155 | } | |
156 | ||
4d284cac | 157 | static int |
1da177e4 LT |
158 | cio_start_handle_notoper(struct subchannel *sch, __u8 lpm) |
159 | { | |
160 | char dbf_text[15]; | |
161 | ||
162 | if (lpm != 0) | |
163 | sch->lpm &= ~lpm; | |
164 | else | |
165 | sch->lpm = 0; | |
166 | ||
a8237fc4 | 167 | stsch (sch->schid, &sch->schib); |
1da177e4 LT |
168 | |
169 | CIO_MSG_EVENT(0, "cio_start: 'not oper' status for " | |
fb6958a5 CH |
170 | "subchannel 0.%x.%04x!\n", sch->schid.ssid, |
171 | sch->schid.sch_no); | |
1da177e4 LT |
172 | sprintf(dbf_text, "no%s", sch->dev.bus_id); |
173 | CIO_TRACE_EVENT(0, dbf_text); | |
174 | CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib)); | |
175 | ||
176 | return (sch->lpm ? -EACCES : -ENODEV); | |
177 | } | |
178 | ||
179 | int | |
180 | cio_start_key (struct subchannel *sch, /* subchannel structure */ | |
181 | struct ccw1 * cpa, /* logical channel prog addr */ | |
182 | __u8 lpm, /* logical path mask */ | |
183 | __u8 key) /* storage key */ | |
184 | { | |
185 | char dbf_txt[15]; | |
186 | int ccode; | |
187 | ||
188 | CIO_TRACE_EVENT (4, "stIO"); | |
189 | CIO_TRACE_EVENT (4, sch->dev.bus_id); | |
190 | ||
191 | /* sch is always under 2G. */ | |
192 | sch->orb.intparm = (__u32)(unsigned long)sch; | |
193 | sch->orb.fmt = 1; | |
194 | ||
195 | sch->orb.pfch = sch->options.prefetch == 0; | |
196 | sch->orb.spnd = sch->options.suspend; | |
197 | sch->orb.ssic = sch->options.suspend && sch->options.inter; | |
e0e32c8e | 198 | sch->orb.lpm = (lpm != 0) ? lpm : sch->lpm; |
347a8dc3 | 199 | #ifdef CONFIG_64BIT |
1da177e4 LT |
200 | /* |
201 | * for 64 bit we always support 64 bit IDAWs with 4k page size only | |
202 | */ | |
203 | sch->orb.c64 = 1; | |
204 | sch->orb.i2k = 0; | |
205 | #endif | |
206 | sch->orb.key = key >> 4; | |
207 | /* issue "Start Subchannel" */ | |
208 | sch->orb.cpa = (__u32) __pa (cpa); | |
a8237fc4 | 209 | ccode = ssch (sch->schid, &sch->orb); |
1da177e4 LT |
210 | |
211 | /* process condition code */ | |
212 | sprintf (dbf_txt, "ccode:%d", ccode); | |
213 | CIO_TRACE_EVENT (4, dbf_txt); | |
214 | ||
215 | switch (ccode) { | |
216 | case 0: | |
217 | /* | |
218 | * initialize device status information | |
219 | */ | |
220 | sch->schib.scsw.actl |= SCSW_ACTL_START_PEND; | |
221 | return 0; | |
222 | case 1: /* status pending */ | |
223 | case 2: /* busy */ | |
224 | return -EBUSY; | |
225 | default: /* device/path not operational */ | |
226 | return cio_start_handle_notoper(sch, lpm); | |
227 | } | |
228 | } | |
229 | ||
230 | int | |
231 | cio_start (struct subchannel *sch, struct ccw1 *cpa, __u8 lpm) | |
232 | { | |
0b642ede | 233 | return cio_start_key(sch, cpa, lpm, PAGE_DEFAULT_KEY); |
1da177e4 LT |
234 | } |
235 | ||
236 | /* | |
237 | * resume suspended I/O operation | |
238 | */ | |
239 | int | |
240 | cio_resume (struct subchannel *sch) | |
241 | { | |
242 | char dbf_txt[15]; | |
243 | int ccode; | |
244 | ||
245 | CIO_TRACE_EVENT (4, "resIO"); | |
246 | CIO_TRACE_EVENT (4, sch->dev.bus_id); | |
247 | ||
a8237fc4 | 248 | ccode = rsch (sch->schid); |
1da177e4 LT |
249 | |
250 | sprintf (dbf_txt, "ccode:%d", ccode); | |
251 | CIO_TRACE_EVENT (4, dbf_txt); | |
252 | ||
253 | switch (ccode) { | |
254 | case 0: | |
255 | sch->schib.scsw.actl |= SCSW_ACTL_RESUME_PEND; | |
256 | return 0; | |
257 | case 1: | |
258 | return -EBUSY; | |
259 | case 2: | |
260 | return -EINVAL; | |
261 | default: | |
262 | /* | |
263 | * useless to wait for request completion | |
264 | * as device is no longer operational ! | |
265 | */ | |
266 | return -ENODEV; | |
267 | } | |
268 | } | |
269 | ||
270 | /* | |
271 | * halt I/O operation | |
272 | */ | |
273 | int | |
274 | cio_halt(struct subchannel *sch) | |
275 | { | |
276 | char dbf_txt[15]; | |
277 | int ccode; | |
278 | ||
279 | if (!sch) | |
280 | return -ENODEV; | |
281 | ||
282 | CIO_TRACE_EVENT (2, "haltIO"); | |
283 | CIO_TRACE_EVENT (2, sch->dev.bus_id); | |
284 | ||
285 | /* | |
286 | * Issue "Halt subchannel" and process condition code | |
287 | */ | |
a8237fc4 | 288 | ccode = hsch (sch->schid); |
1da177e4 LT |
289 | |
290 | sprintf (dbf_txt, "ccode:%d", ccode); | |
291 | CIO_TRACE_EVENT (2, dbf_txt); | |
292 | ||
293 | switch (ccode) { | |
294 | case 0: | |
295 | sch->schib.scsw.actl |= SCSW_ACTL_HALT_PEND; | |
296 | return 0; | |
297 | case 1: /* status pending */ | |
298 | case 2: /* busy */ | |
299 | return -EBUSY; | |
300 | default: /* device not operational */ | |
301 | return -ENODEV; | |
302 | } | |
303 | } | |
304 | ||
305 | /* | |
306 | * Clear I/O operation | |
307 | */ | |
308 | int | |
309 | cio_clear(struct subchannel *sch) | |
310 | { | |
311 | char dbf_txt[15]; | |
312 | int ccode; | |
313 | ||
314 | if (!sch) | |
315 | return -ENODEV; | |
316 | ||
317 | CIO_TRACE_EVENT (2, "clearIO"); | |
318 | CIO_TRACE_EVENT (2, sch->dev.bus_id); | |
319 | ||
320 | /* | |
321 | * Issue "Clear subchannel" and process condition code | |
322 | */ | |
a8237fc4 | 323 | ccode = csch (sch->schid); |
1da177e4 LT |
324 | |
325 | sprintf (dbf_txt, "ccode:%d", ccode); | |
326 | CIO_TRACE_EVENT (2, dbf_txt); | |
327 | ||
328 | switch (ccode) { | |
329 | case 0: | |
330 | sch->schib.scsw.actl |= SCSW_ACTL_CLEAR_PEND; | |
331 | return 0; | |
332 | default: /* device not operational */ | |
333 | return -ENODEV; | |
334 | } | |
335 | } | |
336 | ||
337 | /* | |
338 | * Function: cio_cancel | |
339 | * Issues a "Cancel Subchannel" on the specified subchannel | |
340 | * Note: We don't need any fancy intparms and flags here | |
341 | * since xsch is executed synchronously. | |
342 | * Only for common I/O internal use as for now. | |
343 | */ | |
344 | int | |
345 | cio_cancel (struct subchannel *sch) | |
346 | { | |
347 | char dbf_txt[15]; | |
348 | int ccode; | |
349 | ||
350 | if (!sch) | |
351 | return -ENODEV; | |
352 | ||
353 | CIO_TRACE_EVENT (2, "cancelIO"); | |
354 | CIO_TRACE_EVENT (2, sch->dev.bus_id); | |
355 | ||
a8237fc4 | 356 | ccode = xsch (sch->schid); |
1da177e4 LT |
357 | |
358 | sprintf (dbf_txt, "ccode:%d", ccode); | |
359 | CIO_TRACE_EVENT (2, dbf_txt); | |
360 | ||
361 | switch (ccode) { | |
362 | case 0: /* success */ | |
363 | /* Update information in scsw. */ | |
a8237fc4 | 364 | stsch (sch->schid, &sch->schib); |
1da177e4 LT |
365 | return 0; |
366 | case 1: /* status pending */ | |
367 | return -EBUSY; | |
368 | case 2: /* not applicable */ | |
369 | return -EINVAL; | |
370 | default: /* not oper */ | |
371 | return -ENODEV; | |
372 | } | |
373 | } | |
374 | ||
375 | /* | |
376 | * Function: cio_modify | |
377 | * Issues a "Modify Subchannel" on the specified subchannel | |
378 | */ | |
379 | int | |
380 | cio_modify (struct subchannel *sch) | |
381 | { | |
382 | int ccode, retry, ret; | |
383 | ||
384 | ret = 0; | |
385 | for (retry = 0; retry < 5; retry++) { | |
a8237fc4 | 386 | ccode = msch_err (sch->schid, &sch->schib); |
1da177e4 LT |
387 | if (ccode < 0) /* -EIO if msch gets a program check. */ |
388 | return ccode; | |
389 | switch (ccode) { | |
390 | case 0: /* successfull */ | |
391 | return 0; | |
392 | case 1: /* status pending */ | |
393 | return -EBUSY; | |
394 | case 2: /* busy */ | |
395 | udelay (100); /* allow for recovery */ | |
396 | ret = -EBUSY; | |
397 | break; | |
398 | case 3: /* not operational */ | |
399 | return -ENODEV; | |
400 | } | |
401 | } | |
402 | return ret; | |
403 | } | |
404 | ||
405 | /* | |
406 | * Enable subchannel. | |
407 | */ | |
408 | int | |
409 | cio_enable_subchannel (struct subchannel *sch, unsigned int isc) | |
410 | { | |
411 | char dbf_txt[15]; | |
412 | int ccode; | |
413 | int retry; | |
414 | int ret; | |
415 | ||
416 | CIO_TRACE_EVENT (2, "ensch"); | |
417 | CIO_TRACE_EVENT (2, sch->dev.bus_id); | |
418 | ||
d7b5a4c9 CH |
419 | if (sch_is_pseudo_sch(sch)) |
420 | return -EINVAL; | |
a8237fc4 | 421 | ccode = stsch (sch->schid, &sch->schib); |
1da177e4 LT |
422 | if (ccode) |
423 | return -ENODEV; | |
424 | ||
425 | for (retry = 5, ret = 0; retry > 0; retry--) { | |
426 | sch->schib.pmcw.ena = 1; | |
427 | sch->schib.pmcw.isc = isc; | |
428 | sch->schib.pmcw.intparm = (__u32)(unsigned long)sch; | |
429 | ret = cio_modify(sch); | |
430 | if (ret == -ENODEV) | |
431 | break; | |
432 | if (ret == -EIO) | |
433 | /* | |
434 | * Got a program check in cio_modify. Try without | |
435 | * the concurrent sense bit the next time. | |
436 | */ | |
437 | sch->schib.pmcw.csense = 0; | |
438 | if (ret == 0) { | |
a8237fc4 | 439 | stsch (sch->schid, &sch->schib); |
1da177e4 LT |
440 | if (sch->schib.pmcw.ena) |
441 | break; | |
442 | } | |
443 | if (ret == -EBUSY) { | |
444 | struct irb irb; | |
a8237fc4 | 445 | if (tsch(sch->schid, &irb) != 0) |
1da177e4 LT |
446 | break; |
447 | } | |
448 | } | |
449 | sprintf (dbf_txt, "ret:%d", ret); | |
450 | CIO_TRACE_EVENT (2, dbf_txt); | |
451 | return ret; | |
452 | } | |
453 | ||
454 | /* | |
455 | * Disable subchannel. | |
456 | */ | |
457 | int | |
458 | cio_disable_subchannel (struct subchannel *sch) | |
459 | { | |
460 | char dbf_txt[15]; | |
461 | int ccode; | |
462 | int retry; | |
463 | int ret; | |
464 | ||
465 | CIO_TRACE_EVENT (2, "dissch"); | |
466 | CIO_TRACE_EVENT (2, sch->dev.bus_id); | |
467 | ||
d7b5a4c9 CH |
468 | if (sch_is_pseudo_sch(sch)) |
469 | return 0; | |
a8237fc4 | 470 | ccode = stsch (sch->schid, &sch->schib); |
1da177e4 LT |
471 | if (ccode == 3) /* Not operational. */ |
472 | return -ENODEV; | |
473 | ||
474 | if (sch->schib.scsw.actl != 0) | |
475 | /* | |
476 | * the disable function must not be called while there are | |
477 | * requests pending for completion ! | |
478 | */ | |
479 | return -EBUSY; | |
480 | ||
481 | for (retry = 5, ret = 0; retry > 0; retry--) { | |
482 | sch->schib.pmcw.ena = 0; | |
483 | ret = cio_modify(sch); | |
484 | if (ret == -ENODEV) | |
485 | break; | |
486 | if (ret == -EBUSY) | |
487 | /* | |
488 | * The subchannel is busy or status pending. | |
489 | * We'll disable when the next interrupt was delivered | |
490 | * via the state machine. | |
491 | */ | |
492 | break; | |
493 | if (ret == 0) { | |
a8237fc4 | 494 | stsch (sch->schid, &sch->schib); |
1da177e4 LT |
495 | if (!sch->schib.pmcw.ena) |
496 | break; | |
497 | } | |
498 | } | |
499 | sprintf (dbf_txt, "ret:%d", ret); | |
500 | CIO_TRACE_EVENT (2, dbf_txt); | |
501 | return ret; | |
502 | } | |
503 | ||
d7b5a4c9 | 504 | int cio_create_sch_lock(struct subchannel *sch) |
2ec22984 CH |
505 | { |
506 | sch->lock = kmalloc(sizeof(spinlock_t), GFP_KERNEL); | |
507 | if (!sch->lock) | |
508 | return -ENOMEM; | |
509 | spin_lock_init(sch->lock); | |
510 | return 0; | |
511 | } | |
512 | ||
1da177e4 LT |
513 | /* |
514 | * cio_validate_subchannel() | |
515 | * | |
516 | * Find out subchannel type and initialize struct subchannel. | |
517 | * Return codes: | |
518 | * SUBCHANNEL_TYPE_IO for a normal io subchannel | |
519 | * SUBCHANNEL_TYPE_CHSC for a chsc subchannel | |
520 | * SUBCHANNEL_TYPE_MESSAGE for a messaging subchannel | |
521 | * SUBCHANNEL_TYPE_ADM for a adm(?) subchannel | |
522 | * -ENXIO for non-defined subchannels | |
523 | * -ENODEV for subchannels with invalid device number or blacklisted devices | |
524 | */ | |
525 | int | |
a8237fc4 | 526 | cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid) |
1da177e4 LT |
527 | { |
528 | char dbf_txt[15]; | |
529 | int ccode; | |
2ec22984 | 530 | int err; |
1da177e4 | 531 | |
a8237fc4 | 532 | sprintf (dbf_txt, "valsch%x", schid.sch_no); |
1da177e4 LT |
533 | CIO_TRACE_EVENT (4, dbf_txt); |
534 | ||
535 | /* Nuke all fields. */ | |
536 | memset(sch, 0, sizeof(struct subchannel)); | |
537 | ||
2ec22984 CH |
538 | sch->schid = schid; |
539 | if (cio_is_console(schid)) { | |
540 | sch->lock = cio_get_console_lock(); | |
541 | } else { | |
542 | err = cio_create_sch_lock(sch); | |
543 | if (err) | |
544 | goto out; | |
545 | } | |
6ab4879a | 546 | mutex_init(&sch->reg_mutex); |
1da177e4 | 547 | /* Set a name for the subchannel */ |
fb6958a5 CH |
548 | snprintf (sch->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x", schid.ssid, |
549 | schid.sch_no); | |
1da177e4 LT |
550 | |
551 | /* | |
552 | * The first subchannel that is not-operational (ccode==3) | |
553 | * indicates that there aren't any more devices available. | |
fb6958a5 CH |
554 | * If stsch gets an exception, it means the current subchannel set |
555 | * is not valid. | |
1da177e4 | 556 | */ |
fb6958a5 | 557 | ccode = stsch_err (schid, &sch->schib); |
2ec22984 CH |
558 | if (ccode) { |
559 | err = (ccode == 3) ? -ENXIO : ccode; | |
560 | goto out; | |
561 | } | |
1da177e4 LT |
562 | /* Copy subchannel type from path management control word. */ |
563 | sch->st = sch->schib.pmcw.st; | |
564 | ||
565 | /* | |
566 | * ... just being curious we check for non I/O subchannels | |
567 | */ | |
568 | if (sch->st != 0) { | |
569 | CIO_DEBUG(KERN_INFO, 0, | |
e556bbbd | 570 | "cio: Subchannel 0.%x.%04x reports " |
1da177e4 | 571 | "non-I/O subchannel type %04X\n", |
fb6958a5 | 572 | sch->schid.ssid, sch->schid.sch_no, sch->st); |
1da177e4 | 573 | /* We stop here for non-io subchannels. */ |
2ec22984 CH |
574 | err = sch->st; |
575 | goto out; | |
1da177e4 LT |
576 | } |
577 | ||
578 | /* Initialization for io subchannels. */ | |
2ec22984 | 579 | if (!sch->schib.pmcw.dnv) { |
1da177e4 | 580 | /* io subchannel but device number is invalid. */ |
2ec22984 CH |
581 | err = -ENODEV; |
582 | goto out; | |
583 | } | |
1da177e4 | 584 | /* Devno is valid. */ |
fb6958a5 | 585 | if (is_blacklisted (sch->schid.ssid, sch->schib.pmcw.dev)) { |
1da177e4 LT |
586 | /* |
587 | * This device must not be known to Linux. So we simply | |
588 | * say that there is no device and return ENODEV. | |
589 | */ | |
347d59d7 | 590 | CIO_MSG_EVENT(4, "Blacklisted device detected " |
fb6958a5 CH |
591 | "at devno %04X, subchannel set %x\n", |
592 | sch->schib.pmcw.dev, sch->schid.ssid); | |
2ec22984 CH |
593 | err = -ENODEV; |
594 | goto out; | |
1da177e4 | 595 | } |
e6b6e10a PO |
596 | if (cio_is_console(sch->schid)) |
597 | sch->opm = 0xff; | |
598 | else | |
599 | sch->opm = chp_get_sch_opm(sch); | |
28bdc6f6 | 600 | sch->lpm = sch->schib.pmcw.pam & sch->opm; |
1da177e4 LT |
601 | |
602 | CIO_DEBUG(KERN_INFO, 0, | |
e556bbbd | 603 | "cio: Detected device %04x on subchannel 0.%x.%04X" |
1da177e4 | 604 | " - PIM = %02X, PAM = %02X, POM = %02X\n", |
fb6958a5 CH |
605 | sch->schib.pmcw.dev, sch->schid.ssid, |
606 | sch->schid.sch_no, sch->schib.pmcw.pim, | |
1da177e4 LT |
607 | sch->schib.pmcw.pam, sch->schib.pmcw.pom); |
608 | ||
609 | /* | |
610 | * We now have to initially ... | |
611 | * ... set "interruption subclass" | |
612 | * ... enable "concurrent sense" | |
613 | * ... enable "multipath mode" if more than one | |
614 | * CHPID is available. This is done regardless | |
615 | * whether multiple paths are available for us. | |
616 | */ | |
617 | sch->schib.pmcw.isc = 3; /* could be smth. else */ | |
618 | sch->schib.pmcw.csense = 1; /* concurrent sense */ | |
619 | sch->schib.pmcw.ena = 0; | |
620 | if ((sch->lpm & (sch->lpm - 1)) != 0) | |
621 | sch->schib.pmcw.mp = 1; /* multipath mode */ | |
1842f2b1 CH |
622 | /* clean up possible residual cmf stuff */ |
623 | sch->schib.pmcw.mme = 0; | |
624 | sch->schib.pmcw.mbfc = 0; | |
625 | sch->schib.pmcw.mbi = 0; | |
626 | sch->schib.mba = 0; | |
1da177e4 | 627 | return 0; |
2ec22984 CH |
628 | out: |
629 | if (!cio_is_console(schid)) | |
630 | kfree(sch->lock); | |
631 | sch->lock = NULL; | |
632 | return err; | |
1da177e4 LT |
633 | } |
634 | ||
635 | /* | |
636 | * do_IRQ() handles all normal I/O device IRQ's (the special | |
637 | * SMP cross-CPU interrupts have their own specific | |
638 | * handlers). | |
639 | * | |
640 | */ | |
641 | void | |
642 | do_IRQ (struct pt_regs *regs) | |
643 | { | |
644 | struct tpi_info *tpi_info; | |
645 | struct subchannel *sch; | |
646 | struct irb *irb; | |
5a489b98 | 647 | struct pt_regs *old_regs; |
1da177e4 | 648 | |
5a489b98 | 649 | old_regs = set_irq_regs(regs); |
9d0a57cb | 650 | irq_enter(); |
1da177e4 LT |
651 | asm volatile ("mc 0,0"); |
652 | if (S390_lowcore.int_clock >= S390_lowcore.jiffy_timer) | |
653 | /** | |
654 | * Make sure that the i/o interrupt did not "overtake" | |
655 | * the last HZ timer interrupt. | |
656 | */ | |
d54853ef | 657 | account_ticks(S390_lowcore.int_clock); |
1da177e4 LT |
658 | /* |
659 | * Get interrupt information from lowcore | |
660 | */ | |
661 | tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID; | |
662 | irb = (struct irb *) __LC_IRB; | |
663 | do { | |
664 | kstat_cpu(smp_processor_id()).irqs[IO_INTERRUPT]++; | |
665 | /* | |
666 | * Non I/O-subchannel thin interrupts are processed differently | |
667 | */ | |
668 | if (tpi_info->adapter_IO == 1 && | |
669 | tpi_info->int_type == IO_INTERRUPT_TYPE) { | |
670 | do_adapter_IO(); | |
671 | continue; | |
672 | } | |
673 | sch = (struct subchannel *)(unsigned long)tpi_info->intparm; | |
674 | if (sch) | |
2ec22984 | 675 | spin_lock(sch->lock); |
1da177e4 | 676 | /* Store interrupt response block to lowcore. */ |
a8237fc4 | 677 | if (tsch (tpi_info->schid, irb) == 0 && sch) { |
1da177e4 LT |
678 | /* Keep subchannel information word up to date. */ |
679 | memcpy (&sch->schib.scsw, &irb->scsw, | |
680 | sizeof (irb->scsw)); | |
681 | /* Call interrupt handler if there is one. */ | |
682 | if (sch->driver && sch->driver->irq) | |
602b20f2 | 683 | sch->driver->irq(sch); |
1da177e4 LT |
684 | } |
685 | if (sch) | |
2ec22984 | 686 | spin_unlock(sch->lock); |
1da177e4 LT |
687 | /* |
688 | * Are more interrupts pending? | |
689 | * If so, the tpi instruction will update the lowcore | |
690 | * to hold the info for the next interrupt. | |
691 | * We don't do this for VM because a tpi drops the cpu | |
692 | * out of the sie which costs more cycles than it saves. | |
693 | */ | |
694 | } while (!MACHINE_IS_VM && tpi (NULL) != 0); | |
9d0a57cb | 695 | irq_exit(); |
5a489b98 | 696 | set_irq_regs(old_regs); |
1da177e4 LT |
697 | } |
698 | ||
699 | #ifdef CONFIG_CCW_CONSOLE | |
700 | static struct subchannel console_subchannel; | |
701 | static int console_subchannel_in_use; | |
702 | ||
703 | /* | |
704 | * busy wait for the next interrupt on the console | |
705 | */ | |
706 | void | |
707 | wait_cons_dev (void) | |
708 | { | |
709 | unsigned long cr6 __attribute__ ((aligned (8))); | |
710 | unsigned long save_cr6 __attribute__ ((aligned (8))); | |
711 | ||
712 | /* | |
713 | * before entering the spinlock we may already have | |
714 | * processed the interrupt on a different CPU... | |
715 | */ | |
716 | if (!console_subchannel_in_use) | |
717 | return; | |
718 | ||
719 | /* disable all but isc 7 (console device) */ | |
720 | __ctl_store (save_cr6, 6, 6); | |
721 | cr6 = 0x01000000; | |
722 | __ctl_load (cr6, 6, 6); | |
723 | ||
724 | do { | |
2ec22984 | 725 | spin_unlock(console_subchannel.lock); |
1da177e4 LT |
726 | if (!cio_tpi()) |
727 | cpu_relax(); | |
2ec22984 | 728 | spin_lock(console_subchannel.lock); |
1da177e4 LT |
729 | } while (console_subchannel.schib.scsw.actl != 0); |
730 | /* | |
731 | * restore previous isc value | |
732 | */ | |
733 | __ctl_load (save_cr6, 6, 6); | |
734 | } | |
735 | ||
736 | static int | |
f97a56fb CH |
737 | cio_test_for_console(struct subchannel_id schid, void *data) |
738 | { | |
fb6958a5 | 739 | if (stsch_err(schid, &console_subchannel.schib) != 0) |
f97a56fb CH |
740 | return -ENXIO; |
741 | if (console_subchannel.schib.pmcw.dnv && | |
742 | console_subchannel.schib.pmcw.dev == | |
743 | console_devno) { | |
744 | console_irq = schid.sch_no; | |
745 | return 1; /* found */ | |
746 | } | |
747 | return 0; | |
748 | } | |
749 | ||
750 | ||
751 | static int | |
752 | cio_get_console_sch_no(void) | |
1da177e4 | 753 | { |
a8237fc4 | 754 | struct subchannel_id schid; |
1da177e4 | 755 | |
a8237fc4 | 756 | init_subchannel_id(&schid); |
1da177e4 LT |
757 | if (console_irq != -1) { |
758 | /* VM provided us with the irq number of the console. */ | |
a8237fc4 CH |
759 | schid.sch_no = console_irq; |
760 | if (stsch(schid, &console_subchannel.schib) != 0 || | |
1da177e4 LT |
761 | !console_subchannel.schib.pmcw.dnv) |
762 | return -1; | |
763 | console_devno = console_subchannel.schib.pmcw.dev; | |
764 | } else if (console_devno != -1) { | |
765 | /* At least the console device number is known. */ | |
f97a56fb | 766 | for_each_subchannel(cio_test_for_console, NULL); |
1da177e4 LT |
767 | if (console_irq == -1) |
768 | return -1; | |
769 | } else { | |
770 | /* unlike in 2.4, we cannot autoprobe here, since | |
771 | * the channel subsystem is not fully initialized. | |
772 | * With some luck, the HWC console can take over */ | |
e556bbbd | 773 | printk(KERN_WARNING "cio: No ccw console found!\n"); |
1da177e4 LT |
774 | return -1; |
775 | } | |
776 | return console_irq; | |
777 | } | |
778 | ||
779 | struct subchannel * | |
780 | cio_probe_console(void) | |
781 | { | |
f97a56fb | 782 | int sch_no, ret; |
a8237fc4 | 783 | struct subchannel_id schid; |
1da177e4 LT |
784 | |
785 | if (xchg(&console_subchannel_in_use, 1) != 0) | |
786 | return ERR_PTR(-EBUSY); | |
f97a56fb CH |
787 | sch_no = cio_get_console_sch_no(); |
788 | if (sch_no == -1) { | |
1da177e4 LT |
789 | console_subchannel_in_use = 0; |
790 | return ERR_PTR(-ENODEV); | |
791 | } | |
792 | memset(&console_subchannel, 0, sizeof(struct subchannel)); | |
a8237fc4 | 793 | init_subchannel_id(&schid); |
f97a56fb | 794 | schid.sch_no = sch_no; |
a8237fc4 | 795 | ret = cio_validate_subchannel(&console_subchannel, schid); |
1da177e4 LT |
796 | if (ret) { |
797 | console_subchannel_in_use = 0; | |
798 | return ERR_PTR(-ENODEV); | |
799 | } | |
800 | ||
801 | /* | |
802 | * enable console I/O-interrupt subclass 7 | |
803 | */ | |
804 | ctl_set_bit(6, 24); | |
805 | console_subchannel.schib.pmcw.isc = 7; | |
806 | console_subchannel.schib.pmcw.intparm = | |
807 | (__u32)(unsigned long)&console_subchannel; | |
808 | ret = cio_modify(&console_subchannel); | |
809 | if (ret) { | |
810 | console_subchannel_in_use = 0; | |
811 | return ERR_PTR(ret); | |
812 | } | |
813 | return &console_subchannel; | |
814 | } | |
815 | ||
816 | void | |
817 | cio_release_console(void) | |
818 | { | |
819 | console_subchannel.schib.pmcw.intparm = 0; | |
820 | cio_modify(&console_subchannel); | |
821 | ctl_clear_bit(6, 24); | |
822 | console_subchannel_in_use = 0; | |
823 | } | |
824 | ||
825 | /* Bah... hack to catch console special sausages. */ | |
826 | int | |
a8237fc4 | 827 | cio_is_console(struct subchannel_id schid) |
1da177e4 LT |
828 | { |
829 | if (!console_subchannel_in_use) | |
830 | return 0; | |
a8237fc4 | 831 | return schid_equal(&schid, &console_subchannel.schid); |
1da177e4 LT |
832 | } |
833 | ||
834 | struct subchannel * | |
835 | cio_get_console_subchannel(void) | |
836 | { | |
837 | if (!console_subchannel_in_use) | |
d2c993d8 | 838 | return NULL; |
1da177e4 LT |
839 | return &console_subchannel; |
840 | } | |
841 | ||
842 | #endif | |
4d284cac | 843 | static int |
a8237fc4 | 844 | __disable_subchannel_easy(struct subchannel_id schid, struct schib *schib) |
1da177e4 LT |
845 | { |
846 | int retry, cc; | |
847 | ||
848 | cc = 0; | |
849 | for (retry=0;retry<3;retry++) { | |
850 | schib->pmcw.ena = 0; | |
851 | cc = msch(schid, schib); | |
852 | if (cc) | |
853 | return (cc==3?-ENODEV:-EBUSY); | |
854 | stsch(schid, schib); | |
855 | if (!schib->pmcw.ena) | |
856 | return 0; | |
857 | } | |
858 | return -EBUSY; /* uhm... */ | |
859 | } | |
860 | ||
d54853ef MS |
861 | /* we can't use the normal udelay here, since it enables external interrupts */ |
862 | ||
863 | static void udelay_reset(unsigned long usecs) | |
864 | { | |
865 | uint64_t start_cc, end_cc; | |
866 | ||
867 | asm volatile ("STCK %0" : "=m" (start_cc)); | |
868 | do { | |
869 | cpu_relax(); | |
870 | asm volatile ("STCK %0" : "=m" (end_cc)); | |
871 | } while (((end_cc - start_cc)/4096) < usecs); | |
872 | } | |
873 | ||
4d284cac | 874 | static int |
a8237fc4 | 875 | __clear_subchannel_easy(struct subchannel_id schid) |
1da177e4 LT |
876 | { |
877 | int retry; | |
878 | ||
879 | if (csch(schid)) | |
880 | return -ENODEV; | |
881 | for (retry=0;retry<20;retry++) { | |
882 | struct tpi_info ti; | |
883 | ||
884 | if (tpi(&ti)) { | |
a8237fc4 CH |
885 | tsch(ti.schid, (struct irb *)__LC_IRB); |
886 | if (schid_equal(&ti.schid, &schid)) | |
4c24da79 | 887 | return 0; |
1da177e4 | 888 | } |
d54853ef | 889 | udelay_reset(100); |
1da177e4 LT |
890 | } |
891 | return -EBUSY; | |
892 | } | |
893 | ||
a45e1414 MH |
894 | static int pgm_check_occured; |
895 | ||
896 | static void cio_reset_pgm_check_handler(void) | |
897 | { | |
898 | pgm_check_occured = 1; | |
899 | } | |
900 | ||
901 | static int stsch_reset(struct subchannel_id schid, volatile struct schib *addr) | |
902 | { | |
903 | int rc; | |
904 | ||
905 | pgm_check_occured = 0; | |
ab14de6c | 906 | s390_base_pgm_handler_fn = cio_reset_pgm_check_handler; |
6faf4444 | 907 | rc = stsch(schid, addr); |
ab14de6c | 908 | s390_base_pgm_handler_fn = NULL; |
aa77015c | 909 | |
ab14de6c | 910 | /* The program check handler could have changed pgm_check_occured. */ |
6faf4444 | 911 | barrier(); |
aa77015c | 912 | |
a45e1414 MH |
913 | if (pgm_check_occured) |
914 | return -EIO; | |
915 | else | |
916 | return rc; | |
917 | } | |
918 | ||
15e9b586 | 919 | static int __shutdown_subchannel_easy(struct subchannel_id schid, void *data) |
f97a56fb CH |
920 | { |
921 | struct schib schib; | |
922 | ||
a45e1414 | 923 | if (stsch_reset(schid, &schib)) |
f97a56fb CH |
924 | return -ENXIO; |
925 | if (!schib.pmcw.ena) | |
926 | return 0; | |
927 | switch(__disable_subchannel_easy(schid, &schib)) { | |
928 | case 0: | |
929 | case -ENODEV: | |
930 | break; | |
931 | default: /* -EBUSY */ | |
932 | if (__clear_subchannel_easy(schid)) | |
933 | break; /* give up... */ | |
934 | stsch(schid, &schib); | |
935 | __disable_subchannel_easy(schid, &schib); | |
936 | } | |
937 | return 0; | |
938 | } | |
1da177e4 | 939 | |
15e9b586 HC |
940 | static atomic_t chpid_reset_count; |
941 | ||
942 | static void s390_reset_chpids_mcck_handler(void) | |
943 | { | |
944 | struct crw crw; | |
945 | struct mci *mci; | |
946 | ||
947 | /* Check for pending channel report word. */ | |
948 | mci = (struct mci *)&S390_lowcore.mcck_interruption_code; | |
949 | if (!mci->cp) | |
950 | return; | |
951 | /* Process channel report words. */ | |
952 | while (stcrw(&crw) == 0) { | |
953 | /* Check for responses to RCHP. */ | |
954 | if (crw.slct && crw.rsc == CRW_RSC_CPATH) | |
955 | atomic_dec(&chpid_reset_count); | |
956 | } | |
957 | } | |
958 | ||
959 | #define RCHP_TIMEOUT (30 * USEC_PER_SEC) | |
960 | static void css_reset(void) | |
961 | { | |
962 | int i, ret; | |
963 | unsigned long long timeout; | |
f86635fa | 964 | struct chp_id chpid; |
15e9b586 HC |
965 | |
966 | /* Reset subchannels. */ | |
967 | for_each_subchannel(__shutdown_subchannel_easy, NULL); | |
968 | /* Reset channel paths. */ | |
ab14de6c | 969 | s390_base_mcck_handler_fn = s390_reset_chpids_mcck_handler; |
15e9b586 HC |
970 | /* Enable channel report machine checks. */ |
971 | __ctl_set_bit(14, 28); | |
972 | /* Temporarily reenable machine checks. */ | |
973 | local_mcck_enable(); | |
f86635fa | 974 | chp_id_init(&chpid); |
15e9b586 | 975 | for (i = 0; i <= __MAX_CHPID; i++) { |
f86635fa PO |
976 | chpid.id = i; |
977 | ret = rchp(chpid); | |
15e9b586 HC |
978 | if ((ret == 0) || (ret == 2)) |
979 | /* | |
980 | * rchp either succeeded, or another rchp is already | |
981 | * in progress. In either case, we'll get a crw. | |
982 | */ | |
983 | atomic_inc(&chpid_reset_count); | |
984 | } | |
985 | /* Wait for machine check for all channel paths. */ | |
986 | timeout = get_clock() + (RCHP_TIMEOUT << 12); | |
987 | while (atomic_read(&chpid_reset_count) != 0) { | |
988 | if (get_clock() > timeout) | |
989 | break; | |
990 | cpu_relax(); | |
991 | } | |
992 | /* Disable machine checks again. */ | |
993 | local_mcck_disable(); | |
994 | /* Disable channel report machine checks. */ | |
995 | __ctl_clear_bit(14, 28); | |
ab14de6c | 996 | s390_base_mcck_handler_fn = NULL; |
15e9b586 HC |
997 | } |
998 | ||
999 | static struct reset_call css_reset_call = { | |
1000 | .fn = css_reset, | |
1001 | }; | |
1002 | ||
1003 | static int __init init_css_reset_call(void) | |
1004 | { | |
1005 | atomic_set(&chpid_reset_count, 0); | |
1006 | register_reset_call(&css_reset_call); | |
1007 | return 0; | |
1008 | } | |
1009 | ||
1010 | arch_initcall(init_css_reset_call); | |
1011 | ||
1012 | struct sch_match_id { | |
1013 | struct subchannel_id schid; | |
1014 | struct ccw_dev_id devid; | |
1015 | int rc; | |
1016 | }; | |
1017 | ||
1018 | static int __reipl_subchannel_match(struct subchannel_id schid, void *data) | |
1019 | { | |
1020 | struct schib schib; | |
1021 | struct sch_match_id *match_id = data; | |
1022 | ||
a45e1414 | 1023 | if (stsch_reset(schid, &schib)) |
15e9b586 HC |
1024 | return -ENXIO; |
1025 | if (schib.pmcw.dnv && | |
1026 | (schib.pmcw.dev == match_id->devid.devno) && | |
1027 | (schid.ssid == match_id->devid.ssid)) { | |
1028 | match_id->schid = schid; | |
1029 | match_id->rc = 0; | |
1030 | return 1; | |
1031 | } | |
1032 | return 0; | |
1033 | } | |
1034 | ||
1035 | static int reipl_find_schid(struct ccw_dev_id *devid, | |
1036 | struct subchannel_id *schid) | |
1da177e4 | 1037 | { |
ff6b8ea6 MH |
1038 | struct sch_match_id match_id; |
1039 | ||
1040 | match_id.devid = *devid; | |
1041 | match_id.rc = -ENODEV; | |
15e9b586 | 1042 | for_each_subchannel(__reipl_subchannel_match, &match_id); |
ff6b8ea6 MH |
1043 | if (match_id.rc == 0) |
1044 | *schid = match_id.schid; | |
1045 | return match_id.rc; | |
1da177e4 LT |
1046 | } |
1047 | ||
ff6b8ea6 MH |
1048 | extern void do_reipl_asm(__u32 schid); |
1049 | ||
1da177e4 | 1050 | /* Make sure all subchannels are quiet before we re-ipl an lpar. */ |
ff6b8ea6 | 1051 | void reipl_ccw_dev(struct ccw_dev_id *devid) |
1da177e4 | 1052 | { |
ff6b8ea6 MH |
1053 | struct subchannel_id schid; |
1054 | ||
15e9b586 HC |
1055 | s390_reset_system(); |
1056 | if (reipl_find_schid(devid, &schid) != 0) | |
ff6b8ea6 | 1057 | panic("IPL Device not found\n"); |
ff6b8ea6 | 1058 | do_reipl_asm(*((__u32*)&schid)); |
1da177e4 | 1059 | } |
e87bfe51 | 1060 | |
6fc321fd | 1061 | int __init cio_get_iplinfo(struct cio_iplinfo *iplinfo) |
e87bfe51 HC |
1062 | { |
1063 | struct subchannel_id schid; | |
6fc321fd | 1064 | struct schib schib; |
e87bfe51 HC |
1065 | |
1066 | schid = *(struct subchannel_id *)__LC_SUBCHANNEL_ID; | |
1067 | if (!schid.one) | |
6fc321fd HC |
1068 | return -ENODEV; |
1069 | if (stsch(schid, &schib)) | |
1070 | return -ENODEV; | |
1071 | if (!schib.pmcw.dnv) | |
1072 | return -ENODEV; | |
1073 | iplinfo->devno = schib.pmcw.dev; | |
1074 | iplinfo->is_qdio = schib.pmcw.qf; | |
1075 | return 0; | |
e87bfe51 | 1076 | } |