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 LT |
4 | * |
5 | * Copyright (C) 1999-2002 IBM Deutschland Entwicklung GmbH, | |
6 | * IBM Corporation | |
7 | * Author(s): Ingo Adlung (adlung@de.ibm.com) | |
4ce3b30c | 8 | * Cornelia Huck (cornelia.huck@de.ibm.com) |
1da177e4 LT |
9 | * Arnd Bergmann (arndb@de.ibm.com) |
10 | * Martin Schwidefsky (schwidefsky@de.ibm.com) | |
11 | */ | |
12 | ||
13 | #include <linux/module.h> | |
1da177e4 LT |
14 | #include <linux/init.h> |
15 | #include <linux/slab.h> | |
16 | #include <linux/device.h> | |
17 | #include <linux/kernel_stat.h> | |
18 | #include <linux/interrupt.h> | |
1da177e4 LT |
19 | #include <asm/cio.h> |
20 | #include <asm/delay.h> | |
21 | #include <asm/irq.h> | |
e87bfe51 | 22 | #include <asm/setup.h> |
1da177e4 LT |
23 | #include "airq.h" |
24 | #include "cio.h" | |
25 | #include "css.h" | |
26 | #include "chsc.h" | |
27 | #include "ioasm.h" | |
28 | #include "blacklist.h" | |
29 | #include "cio_debug.h" | |
30 | ||
31 | debug_info_t *cio_debug_msg_id; | |
32 | debug_info_t *cio_debug_trace_id; | |
33 | debug_info_t *cio_debug_crw_id; | |
34 | ||
35 | int cio_show_msg; | |
36 | ||
37 | static int __init | |
38 | cio_setup (char *parm) | |
39 | { | |
40 | if (!strcmp (parm, "yes")) | |
41 | cio_show_msg = 1; | |
42 | else if (!strcmp (parm, "no")) | |
43 | cio_show_msg = 0; | |
44 | else | |
45 | printk (KERN_ERR "cio_setup : invalid cio_msg parameter '%s'", | |
46 | parm); | |
47 | return 1; | |
48 | } | |
49 | ||
50 | __setup ("cio_msg=", cio_setup); | |
51 | ||
52 | /* | |
53 | * Function: cio_debug_init | |
54 | * Initializes three debug logs (under /proc/s390dbf) for common I/O: | |
55 | * - cio_msg logs the messages which are printk'ed when CONFIG_DEBUG_IO is on | |
56 | * - cio_trace logs the calling of different functions | |
57 | * - cio_crw logs the messages which are printk'ed when CONFIG_DEBUG_CRW is on | |
58 | * debug levels depend on CONFIG_DEBUG_IO resp. CONFIG_DEBUG_CRW | |
59 | */ | |
60 | static int __init | |
61 | cio_debug_init (void) | |
62 | { | |
66a464db | 63 | cio_debug_msg_id = debug_register ("cio_msg", 16, 4, 16*sizeof (long)); |
1da177e4 LT |
64 | if (!cio_debug_msg_id) |
65 | goto out_unregister; | |
66 | debug_register_view (cio_debug_msg_id, &debug_sprintf_view); | |
67 | debug_set_level (cio_debug_msg_id, 2); | |
06fbcb10 | 68 | cio_debug_trace_id = debug_register ("cio_trace", 16, 4, 16); |
1da177e4 LT |
69 | if (!cio_debug_trace_id) |
70 | goto out_unregister; | |
71 | debug_register_view (cio_debug_trace_id, &debug_hex_ascii_view); | |
72 | debug_set_level (cio_debug_trace_id, 2); | |
66a464db | 73 | cio_debug_crw_id = debug_register ("cio_crw", 4, 4, 16*sizeof (long)); |
1da177e4 LT |
74 | if (!cio_debug_crw_id) |
75 | goto out_unregister; | |
76 | debug_register_view (cio_debug_crw_id, &debug_sprintf_view); | |
77 | debug_set_level (cio_debug_crw_id, 2); | |
78 | pr_debug("debugging initialized\n"); | |
79 | return 0; | |
80 | ||
81 | out_unregister: | |
82 | if (cio_debug_msg_id) | |
83 | debug_unregister (cio_debug_msg_id); | |
84 | if (cio_debug_trace_id) | |
85 | debug_unregister (cio_debug_trace_id); | |
86 | if (cio_debug_crw_id) | |
87 | debug_unregister (cio_debug_crw_id); | |
88 | pr_debug("could not initialize debugging\n"); | |
89 | return -1; | |
90 | } | |
91 | ||
92 | arch_initcall (cio_debug_init); | |
93 | ||
94 | int | |
95 | cio_set_options (struct subchannel *sch, int flags) | |
96 | { | |
97 | sch->options.suspend = (flags & DOIO_ALLOW_SUSPEND) != 0; | |
98 | sch->options.prefetch = (flags & DOIO_DENY_PREFETCH) != 0; | |
99 | sch->options.inter = (flags & DOIO_SUPPRESS_INTER) != 0; | |
100 | return 0; | |
101 | } | |
102 | ||
103 | /* FIXME: who wants to use this? */ | |
104 | int | |
105 | cio_get_options (struct subchannel *sch) | |
106 | { | |
107 | int flags; | |
108 | ||
109 | flags = 0; | |
110 | if (sch->options.suspend) | |
111 | flags |= DOIO_ALLOW_SUSPEND; | |
112 | if (sch->options.prefetch) | |
113 | flags |= DOIO_DENY_PREFETCH; | |
114 | if (sch->options.inter) | |
115 | flags |= DOIO_SUPPRESS_INTER; | |
116 | return flags; | |
117 | } | |
118 | ||
119 | /* | |
120 | * Use tpi to get a pending interrupt, call the interrupt handler and | |
121 | * return a pointer to the subchannel structure. | |
122 | */ | |
123 | static inline int | |
124 | cio_tpi(void) | |
125 | { | |
126 | struct tpi_info *tpi_info; | |
127 | struct subchannel *sch; | |
128 | struct irb *irb; | |
129 | ||
130 | tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID; | |
131 | if (tpi (NULL) != 1) | |
132 | return 0; | |
133 | irb = (struct irb *) __LC_IRB; | |
134 | /* Store interrupt response block to lowcore. */ | |
a8237fc4 | 135 | if (tsch (tpi_info->schid, irb) != 0) |
1da177e4 LT |
136 | /* Not status pending or not operational. */ |
137 | return 1; | |
138 | sch = (struct subchannel *)(unsigned long)tpi_info->intparm; | |
139 | if (!sch) | |
140 | return 1; | |
141 | local_bh_disable(); | |
142 | irq_enter (); | |
143 | spin_lock(&sch->lock); | |
144 | memcpy (&sch->schib.scsw, &irb->scsw, sizeof (struct scsw)); | |
145 | if (sch->driver && sch->driver->irq) | |
146 | sch->driver->irq(&sch->dev); | |
147 | spin_unlock(&sch->lock); | |
148 | irq_exit (); | |
1f194a4c | 149 | _local_bh_enable(); |
1da177e4 LT |
150 | return 1; |
151 | } | |
152 | ||
153 | static inline int | |
154 | cio_start_handle_notoper(struct subchannel *sch, __u8 lpm) | |
155 | { | |
156 | char dbf_text[15]; | |
157 | ||
158 | if (lpm != 0) | |
159 | sch->lpm &= ~lpm; | |
160 | else | |
161 | sch->lpm = 0; | |
162 | ||
a8237fc4 | 163 | stsch (sch->schid, &sch->schib); |
1da177e4 LT |
164 | |
165 | CIO_MSG_EVENT(0, "cio_start: 'not oper' status for " | |
fb6958a5 CH |
166 | "subchannel 0.%x.%04x!\n", sch->schid.ssid, |
167 | sch->schid.sch_no); | |
1da177e4 LT |
168 | sprintf(dbf_text, "no%s", sch->dev.bus_id); |
169 | CIO_TRACE_EVENT(0, dbf_text); | |
170 | CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib)); | |
171 | ||
172 | return (sch->lpm ? -EACCES : -ENODEV); | |
173 | } | |
174 | ||
175 | int | |
176 | cio_start_key (struct subchannel *sch, /* subchannel structure */ | |
177 | struct ccw1 * cpa, /* logical channel prog addr */ | |
178 | __u8 lpm, /* logical path mask */ | |
179 | __u8 key) /* storage key */ | |
180 | { | |
181 | char dbf_txt[15]; | |
182 | int ccode; | |
183 | ||
184 | CIO_TRACE_EVENT (4, "stIO"); | |
185 | CIO_TRACE_EVENT (4, sch->dev.bus_id); | |
186 | ||
187 | /* sch is always under 2G. */ | |
188 | sch->orb.intparm = (__u32)(unsigned long)sch; | |
189 | sch->orb.fmt = 1; | |
190 | ||
191 | sch->orb.pfch = sch->options.prefetch == 0; | |
192 | sch->orb.spnd = sch->options.suspend; | |
193 | sch->orb.ssic = sch->options.suspend && sch->options.inter; | |
e0e32c8e | 194 | sch->orb.lpm = (lpm != 0) ? lpm : sch->lpm; |
347a8dc3 | 195 | #ifdef CONFIG_64BIT |
1da177e4 LT |
196 | /* |
197 | * for 64 bit we always support 64 bit IDAWs with 4k page size only | |
198 | */ | |
199 | sch->orb.c64 = 1; | |
200 | sch->orb.i2k = 0; | |
201 | #endif | |
202 | sch->orb.key = key >> 4; | |
203 | /* issue "Start Subchannel" */ | |
204 | sch->orb.cpa = (__u32) __pa (cpa); | |
a8237fc4 | 205 | ccode = ssch (sch->schid, &sch->orb); |
1da177e4 LT |
206 | |
207 | /* process condition code */ | |
208 | sprintf (dbf_txt, "ccode:%d", ccode); | |
209 | CIO_TRACE_EVENT (4, dbf_txt); | |
210 | ||
211 | switch (ccode) { | |
212 | case 0: | |
213 | /* | |
214 | * initialize device status information | |
215 | */ | |
216 | sch->schib.scsw.actl |= SCSW_ACTL_START_PEND; | |
217 | return 0; | |
218 | case 1: /* status pending */ | |
219 | case 2: /* busy */ | |
220 | return -EBUSY; | |
221 | default: /* device/path not operational */ | |
222 | return cio_start_handle_notoper(sch, lpm); | |
223 | } | |
224 | } | |
225 | ||
226 | int | |
227 | cio_start (struct subchannel *sch, struct ccw1 *cpa, __u8 lpm) | |
228 | { | |
0b642ede | 229 | return cio_start_key(sch, cpa, lpm, PAGE_DEFAULT_KEY); |
1da177e4 LT |
230 | } |
231 | ||
232 | /* | |
233 | * resume suspended I/O operation | |
234 | */ | |
235 | int | |
236 | cio_resume (struct subchannel *sch) | |
237 | { | |
238 | char dbf_txt[15]; | |
239 | int ccode; | |
240 | ||
241 | CIO_TRACE_EVENT (4, "resIO"); | |
242 | CIO_TRACE_EVENT (4, sch->dev.bus_id); | |
243 | ||
a8237fc4 | 244 | ccode = rsch (sch->schid); |
1da177e4 LT |
245 | |
246 | sprintf (dbf_txt, "ccode:%d", ccode); | |
247 | CIO_TRACE_EVENT (4, dbf_txt); | |
248 | ||
249 | switch (ccode) { | |
250 | case 0: | |
251 | sch->schib.scsw.actl |= SCSW_ACTL_RESUME_PEND; | |
252 | return 0; | |
253 | case 1: | |
254 | return -EBUSY; | |
255 | case 2: | |
256 | return -EINVAL; | |
257 | default: | |
258 | /* | |
259 | * useless to wait for request completion | |
260 | * as device is no longer operational ! | |
261 | */ | |
262 | return -ENODEV; | |
263 | } | |
264 | } | |
265 | ||
266 | /* | |
267 | * halt I/O operation | |
268 | */ | |
269 | int | |
270 | cio_halt(struct subchannel *sch) | |
271 | { | |
272 | char dbf_txt[15]; | |
273 | int ccode; | |
274 | ||
275 | if (!sch) | |
276 | return -ENODEV; | |
277 | ||
278 | CIO_TRACE_EVENT (2, "haltIO"); | |
279 | CIO_TRACE_EVENT (2, sch->dev.bus_id); | |
280 | ||
281 | /* | |
282 | * Issue "Halt subchannel" and process condition code | |
283 | */ | |
a8237fc4 | 284 | ccode = hsch (sch->schid); |
1da177e4 LT |
285 | |
286 | sprintf (dbf_txt, "ccode:%d", ccode); | |
287 | CIO_TRACE_EVENT (2, dbf_txt); | |
288 | ||
289 | switch (ccode) { | |
290 | case 0: | |
291 | sch->schib.scsw.actl |= SCSW_ACTL_HALT_PEND; | |
292 | return 0; | |
293 | case 1: /* status pending */ | |
294 | case 2: /* busy */ | |
295 | return -EBUSY; | |
296 | default: /* device not operational */ | |
297 | return -ENODEV; | |
298 | } | |
299 | } | |
300 | ||
301 | /* | |
302 | * Clear I/O operation | |
303 | */ | |
304 | int | |
305 | cio_clear(struct subchannel *sch) | |
306 | { | |
307 | char dbf_txt[15]; | |
308 | int ccode; | |
309 | ||
310 | if (!sch) | |
311 | return -ENODEV; | |
312 | ||
313 | CIO_TRACE_EVENT (2, "clearIO"); | |
314 | CIO_TRACE_EVENT (2, sch->dev.bus_id); | |
315 | ||
316 | /* | |
317 | * Issue "Clear subchannel" and process condition code | |
318 | */ | |
a8237fc4 | 319 | ccode = csch (sch->schid); |
1da177e4 LT |
320 | |
321 | sprintf (dbf_txt, "ccode:%d", ccode); | |
322 | CIO_TRACE_EVENT (2, dbf_txt); | |
323 | ||
324 | switch (ccode) { | |
325 | case 0: | |
326 | sch->schib.scsw.actl |= SCSW_ACTL_CLEAR_PEND; | |
327 | return 0; | |
328 | default: /* device not operational */ | |
329 | return -ENODEV; | |
330 | } | |
331 | } | |
332 | ||
333 | /* | |
334 | * Function: cio_cancel | |
335 | * Issues a "Cancel Subchannel" on the specified subchannel | |
336 | * Note: We don't need any fancy intparms and flags here | |
337 | * since xsch is executed synchronously. | |
338 | * Only for common I/O internal use as for now. | |
339 | */ | |
340 | int | |
341 | cio_cancel (struct subchannel *sch) | |
342 | { | |
343 | char dbf_txt[15]; | |
344 | int ccode; | |
345 | ||
346 | if (!sch) | |
347 | return -ENODEV; | |
348 | ||
349 | CIO_TRACE_EVENT (2, "cancelIO"); | |
350 | CIO_TRACE_EVENT (2, sch->dev.bus_id); | |
351 | ||
a8237fc4 | 352 | ccode = xsch (sch->schid); |
1da177e4 LT |
353 | |
354 | sprintf (dbf_txt, "ccode:%d", ccode); | |
355 | CIO_TRACE_EVENT (2, dbf_txt); | |
356 | ||
357 | switch (ccode) { | |
358 | case 0: /* success */ | |
359 | /* Update information in scsw. */ | |
a8237fc4 | 360 | stsch (sch->schid, &sch->schib); |
1da177e4 LT |
361 | return 0; |
362 | case 1: /* status pending */ | |
363 | return -EBUSY; | |
364 | case 2: /* not applicable */ | |
365 | return -EINVAL; | |
366 | default: /* not oper */ | |
367 | return -ENODEV; | |
368 | } | |
369 | } | |
370 | ||
371 | /* | |
372 | * Function: cio_modify | |
373 | * Issues a "Modify Subchannel" on the specified subchannel | |
374 | */ | |
375 | int | |
376 | cio_modify (struct subchannel *sch) | |
377 | { | |
378 | int ccode, retry, ret; | |
379 | ||
380 | ret = 0; | |
381 | for (retry = 0; retry < 5; retry++) { | |
a8237fc4 | 382 | ccode = msch_err (sch->schid, &sch->schib); |
1da177e4 LT |
383 | if (ccode < 0) /* -EIO if msch gets a program check. */ |
384 | return ccode; | |
385 | switch (ccode) { | |
386 | case 0: /* successfull */ | |
387 | return 0; | |
388 | case 1: /* status pending */ | |
389 | return -EBUSY; | |
390 | case 2: /* busy */ | |
391 | udelay (100); /* allow for recovery */ | |
392 | ret = -EBUSY; | |
393 | break; | |
394 | case 3: /* not operational */ | |
395 | return -ENODEV; | |
396 | } | |
397 | } | |
398 | return ret; | |
399 | } | |
400 | ||
401 | /* | |
402 | * Enable subchannel. | |
403 | */ | |
404 | int | |
405 | cio_enable_subchannel (struct subchannel *sch, unsigned int isc) | |
406 | { | |
407 | char dbf_txt[15]; | |
408 | int ccode; | |
409 | int retry; | |
410 | int ret; | |
411 | ||
412 | CIO_TRACE_EVENT (2, "ensch"); | |
413 | CIO_TRACE_EVENT (2, sch->dev.bus_id); | |
414 | ||
a8237fc4 | 415 | ccode = stsch (sch->schid, &sch->schib); |
1da177e4 LT |
416 | if (ccode) |
417 | return -ENODEV; | |
418 | ||
419 | for (retry = 5, ret = 0; retry > 0; retry--) { | |
420 | sch->schib.pmcw.ena = 1; | |
421 | sch->schib.pmcw.isc = isc; | |
422 | sch->schib.pmcw.intparm = (__u32)(unsigned long)sch; | |
423 | ret = cio_modify(sch); | |
424 | if (ret == -ENODEV) | |
425 | break; | |
426 | if (ret == -EIO) | |
427 | /* | |
428 | * Got a program check in cio_modify. Try without | |
429 | * the concurrent sense bit the next time. | |
430 | */ | |
431 | sch->schib.pmcw.csense = 0; | |
432 | if (ret == 0) { | |
a8237fc4 | 433 | stsch (sch->schid, &sch->schib); |
1da177e4 LT |
434 | if (sch->schib.pmcw.ena) |
435 | break; | |
436 | } | |
437 | if (ret == -EBUSY) { | |
438 | struct irb irb; | |
a8237fc4 | 439 | if (tsch(sch->schid, &irb) != 0) |
1da177e4 LT |
440 | break; |
441 | } | |
442 | } | |
443 | sprintf (dbf_txt, "ret:%d", ret); | |
444 | CIO_TRACE_EVENT (2, dbf_txt); | |
445 | return ret; | |
446 | } | |
447 | ||
448 | /* | |
449 | * Disable subchannel. | |
450 | */ | |
451 | int | |
452 | cio_disable_subchannel (struct subchannel *sch) | |
453 | { | |
454 | char dbf_txt[15]; | |
455 | int ccode; | |
456 | int retry; | |
457 | int ret; | |
458 | ||
459 | CIO_TRACE_EVENT (2, "dissch"); | |
460 | CIO_TRACE_EVENT (2, sch->dev.bus_id); | |
461 | ||
a8237fc4 | 462 | ccode = stsch (sch->schid, &sch->schib); |
1da177e4 LT |
463 | if (ccode == 3) /* Not operational. */ |
464 | return -ENODEV; | |
465 | ||
466 | if (sch->schib.scsw.actl != 0) | |
467 | /* | |
468 | * the disable function must not be called while there are | |
469 | * requests pending for completion ! | |
470 | */ | |
471 | return -EBUSY; | |
472 | ||
473 | for (retry = 5, ret = 0; retry > 0; retry--) { | |
474 | sch->schib.pmcw.ena = 0; | |
475 | ret = cio_modify(sch); | |
476 | if (ret == -ENODEV) | |
477 | break; | |
478 | if (ret == -EBUSY) | |
479 | /* | |
480 | * The subchannel is busy or status pending. | |
481 | * We'll disable when the next interrupt was delivered | |
482 | * via the state machine. | |
483 | */ | |
484 | break; | |
485 | if (ret == 0) { | |
a8237fc4 | 486 | stsch (sch->schid, &sch->schib); |
1da177e4 LT |
487 | if (!sch->schib.pmcw.ena) |
488 | break; | |
489 | } | |
490 | } | |
491 | sprintf (dbf_txt, "ret:%d", ret); | |
492 | CIO_TRACE_EVENT (2, dbf_txt); | |
493 | return ret; | |
494 | } | |
495 | ||
496 | /* | |
497 | * cio_validate_subchannel() | |
498 | * | |
499 | * Find out subchannel type and initialize struct subchannel. | |
500 | * Return codes: | |
501 | * SUBCHANNEL_TYPE_IO for a normal io subchannel | |
502 | * SUBCHANNEL_TYPE_CHSC for a chsc subchannel | |
503 | * SUBCHANNEL_TYPE_MESSAGE for a messaging subchannel | |
504 | * SUBCHANNEL_TYPE_ADM for a adm(?) subchannel | |
505 | * -ENXIO for non-defined subchannels | |
506 | * -ENODEV for subchannels with invalid device number or blacklisted devices | |
507 | */ | |
508 | int | |
a8237fc4 | 509 | cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid) |
1da177e4 LT |
510 | { |
511 | char dbf_txt[15]; | |
512 | int ccode; | |
513 | ||
a8237fc4 | 514 | sprintf (dbf_txt, "valsch%x", schid.sch_no); |
1da177e4 LT |
515 | CIO_TRACE_EVENT (4, dbf_txt); |
516 | ||
517 | /* Nuke all fields. */ | |
518 | memset(sch, 0, sizeof(struct subchannel)); | |
519 | ||
520 | spin_lock_init(&sch->lock); | |
6ab4879a | 521 | mutex_init(&sch->reg_mutex); |
1da177e4 LT |
522 | |
523 | /* Set a name for the subchannel */ | |
fb6958a5 CH |
524 | snprintf (sch->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x", schid.ssid, |
525 | schid.sch_no); | |
1da177e4 LT |
526 | |
527 | /* | |
528 | * The first subchannel that is not-operational (ccode==3) | |
529 | * indicates that there aren't any more devices available. | |
fb6958a5 CH |
530 | * If stsch gets an exception, it means the current subchannel set |
531 | * is not valid. | |
1da177e4 | 532 | */ |
fb6958a5 | 533 | ccode = stsch_err (schid, &sch->schib); |
1da177e4 | 534 | if (ccode) |
fb6958a5 | 535 | return (ccode == 3) ? -ENXIO : ccode; |
1da177e4 | 536 | |
a8237fc4 | 537 | sch->schid = schid; |
1da177e4 LT |
538 | /* Copy subchannel type from path management control word. */ |
539 | sch->st = sch->schib.pmcw.st; | |
540 | ||
541 | /* | |
542 | * ... just being curious we check for non I/O subchannels | |
543 | */ | |
544 | if (sch->st != 0) { | |
545 | CIO_DEBUG(KERN_INFO, 0, | |
fb6958a5 | 546 | "Subchannel 0.%x.%04x reports " |
1da177e4 | 547 | "non-I/O subchannel type %04X\n", |
fb6958a5 | 548 | sch->schid.ssid, sch->schid.sch_no, sch->st); |
1da177e4 LT |
549 | /* We stop here for non-io subchannels. */ |
550 | return sch->st; | |
551 | } | |
552 | ||
553 | /* Initialization for io subchannels. */ | |
554 | if (!sch->schib.pmcw.dnv) | |
555 | /* io subchannel but device number is invalid. */ | |
556 | return -ENODEV; | |
557 | ||
558 | /* Devno is valid. */ | |
fb6958a5 | 559 | if (is_blacklisted (sch->schid.ssid, sch->schib.pmcw.dev)) { |
1da177e4 LT |
560 | /* |
561 | * This device must not be known to Linux. So we simply | |
562 | * say that there is no device and return ENODEV. | |
563 | */ | |
564 | CIO_MSG_EVENT(0, "Blacklisted device detected " | |
fb6958a5 CH |
565 | "at devno %04X, subchannel set %x\n", |
566 | sch->schib.pmcw.dev, sch->schid.ssid); | |
1da177e4 LT |
567 | return -ENODEV; |
568 | } | |
569 | sch->opm = 0xff; | |
fb6958a5 CH |
570 | if (!cio_is_console(sch->schid)) |
571 | chsc_validate_chpids(sch); | |
28bdc6f6 | 572 | sch->lpm = sch->schib.pmcw.pam & sch->opm; |
1da177e4 LT |
573 | |
574 | CIO_DEBUG(KERN_INFO, 0, | |
fb6958a5 | 575 | "Detected device %04x on subchannel 0.%x.%04X" |
1da177e4 | 576 | " - PIM = %02X, PAM = %02X, POM = %02X\n", |
fb6958a5 CH |
577 | sch->schib.pmcw.dev, sch->schid.ssid, |
578 | sch->schid.sch_no, sch->schib.pmcw.pim, | |
1da177e4 LT |
579 | sch->schib.pmcw.pam, sch->schib.pmcw.pom); |
580 | ||
581 | /* | |
582 | * We now have to initially ... | |
583 | * ... set "interruption subclass" | |
584 | * ... enable "concurrent sense" | |
585 | * ... enable "multipath mode" if more than one | |
586 | * CHPID is available. This is done regardless | |
587 | * whether multiple paths are available for us. | |
588 | */ | |
589 | sch->schib.pmcw.isc = 3; /* could be smth. else */ | |
590 | sch->schib.pmcw.csense = 1; /* concurrent sense */ | |
591 | sch->schib.pmcw.ena = 0; | |
592 | if ((sch->lpm & (sch->lpm - 1)) != 0) | |
593 | sch->schib.pmcw.mp = 1; /* multipath mode */ | |
594 | return 0; | |
595 | } | |
596 | ||
597 | /* | |
598 | * do_IRQ() handles all normal I/O device IRQ's (the special | |
599 | * SMP cross-CPU interrupts have their own specific | |
600 | * handlers). | |
601 | * | |
602 | */ | |
603 | void | |
604 | do_IRQ (struct pt_regs *regs) | |
605 | { | |
606 | struct tpi_info *tpi_info; | |
607 | struct subchannel *sch; | |
608 | struct irb *irb; | |
609 | ||
610 | irq_enter (); | |
611 | asm volatile ("mc 0,0"); | |
612 | if (S390_lowcore.int_clock >= S390_lowcore.jiffy_timer) | |
613 | /** | |
614 | * Make sure that the i/o interrupt did not "overtake" | |
615 | * the last HZ timer interrupt. | |
616 | */ | |
617 | account_ticks(regs); | |
618 | /* | |
619 | * Get interrupt information from lowcore | |
620 | */ | |
621 | tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID; | |
622 | irb = (struct irb *) __LC_IRB; | |
623 | do { | |
624 | kstat_cpu(smp_processor_id()).irqs[IO_INTERRUPT]++; | |
625 | /* | |
626 | * Non I/O-subchannel thin interrupts are processed differently | |
627 | */ | |
628 | if (tpi_info->adapter_IO == 1 && | |
629 | tpi_info->int_type == IO_INTERRUPT_TYPE) { | |
630 | do_adapter_IO(); | |
631 | continue; | |
632 | } | |
633 | sch = (struct subchannel *)(unsigned long)tpi_info->intparm; | |
634 | if (sch) | |
635 | spin_lock(&sch->lock); | |
636 | /* Store interrupt response block to lowcore. */ | |
a8237fc4 | 637 | if (tsch (tpi_info->schid, irb) == 0 && sch) { |
1da177e4 LT |
638 | /* Keep subchannel information word up to date. */ |
639 | memcpy (&sch->schib.scsw, &irb->scsw, | |
640 | sizeof (irb->scsw)); | |
641 | /* Call interrupt handler if there is one. */ | |
642 | if (sch->driver && sch->driver->irq) | |
643 | sch->driver->irq(&sch->dev); | |
644 | } | |
645 | if (sch) | |
646 | spin_unlock(&sch->lock); | |
647 | /* | |
648 | * Are more interrupts pending? | |
649 | * If so, the tpi instruction will update the lowcore | |
650 | * to hold the info for the next interrupt. | |
651 | * We don't do this for VM because a tpi drops the cpu | |
652 | * out of the sie which costs more cycles than it saves. | |
653 | */ | |
654 | } while (!MACHINE_IS_VM && tpi (NULL) != 0); | |
655 | irq_exit (); | |
656 | } | |
657 | ||
658 | #ifdef CONFIG_CCW_CONSOLE | |
659 | static struct subchannel console_subchannel; | |
660 | static int console_subchannel_in_use; | |
661 | ||
662 | /* | |
663 | * busy wait for the next interrupt on the console | |
664 | */ | |
665 | void | |
666 | wait_cons_dev (void) | |
667 | { | |
668 | unsigned long cr6 __attribute__ ((aligned (8))); | |
669 | unsigned long save_cr6 __attribute__ ((aligned (8))); | |
670 | ||
671 | /* | |
672 | * before entering the spinlock we may already have | |
673 | * processed the interrupt on a different CPU... | |
674 | */ | |
675 | if (!console_subchannel_in_use) | |
676 | return; | |
677 | ||
678 | /* disable all but isc 7 (console device) */ | |
679 | __ctl_store (save_cr6, 6, 6); | |
680 | cr6 = 0x01000000; | |
681 | __ctl_load (cr6, 6, 6); | |
682 | ||
683 | do { | |
684 | spin_unlock(&console_subchannel.lock); | |
685 | if (!cio_tpi()) | |
686 | cpu_relax(); | |
687 | spin_lock(&console_subchannel.lock); | |
688 | } while (console_subchannel.schib.scsw.actl != 0); | |
689 | /* | |
690 | * restore previous isc value | |
691 | */ | |
692 | __ctl_load (save_cr6, 6, 6); | |
693 | } | |
694 | ||
695 | static int | |
f97a56fb CH |
696 | cio_test_for_console(struct subchannel_id schid, void *data) |
697 | { | |
fb6958a5 | 698 | if (stsch_err(schid, &console_subchannel.schib) != 0) |
f97a56fb CH |
699 | return -ENXIO; |
700 | if (console_subchannel.schib.pmcw.dnv && | |
701 | console_subchannel.schib.pmcw.dev == | |
702 | console_devno) { | |
703 | console_irq = schid.sch_no; | |
704 | return 1; /* found */ | |
705 | } | |
706 | return 0; | |
707 | } | |
708 | ||
709 | ||
710 | static int | |
711 | cio_get_console_sch_no(void) | |
1da177e4 | 712 | { |
a8237fc4 | 713 | struct subchannel_id schid; |
1da177e4 | 714 | |
a8237fc4 | 715 | init_subchannel_id(&schid); |
1da177e4 LT |
716 | if (console_irq != -1) { |
717 | /* VM provided us with the irq number of the console. */ | |
a8237fc4 CH |
718 | schid.sch_no = console_irq; |
719 | if (stsch(schid, &console_subchannel.schib) != 0 || | |
1da177e4 LT |
720 | !console_subchannel.schib.pmcw.dnv) |
721 | return -1; | |
722 | console_devno = console_subchannel.schib.pmcw.dev; | |
723 | } else if (console_devno != -1) { | |
724 | /* At least the console device number is known. */ | |
f97a56fb | 725 | for_each_subchannel(cio_test_for_console, NULL); |
1da177e4 LT |
726 | if (console_irq == -1) |
727 | return -1; | |
728 | } else { | |
729 | /* unlike in 2.4, we cannot autoprobe here, since | |
730 | * the channel subsystem is not fully initialized. | |
731 | * With some luck, the HWC console can take over */ | |
732 | printk(KERN_WARNING "No ccw console found!\n"); | |
733 | return -1; | |
734 | } | |
735 | return console_irq; | |
736 | } | |
737 | ||
738 | struct subchannel * | |
739 | cio_probe_console(void) | |
740 | { | |
f97a56fb | 741 | int sch_no, ret; |
a8237fc4 | 742 | struct subchannel_id schid; |
1da177e4 LT |
743 | |
744 | if (xchg(&console_subchannel_in_use, 1) != 0) | |
745 | return ERR_PTR(-EBUSY); | |
f97a56fb CH |
746 | sch_no = cio_get_console_sch_no(); |
747 | if (sch_no == -1) { | |
1da177e4 LT |
748 | console_subchannel_in_use = 0; |
749 | return ERR_PTR(-ENODEV); | |
750 | } | |
751 | memset(&console_subchannel, 0, sizeof(struct subchannel)); | |
a8237fc4 | 752 | init_subchannel_id(&schid); |
f97a56fb | 753 | schid.sch_no = sch_no; |
a8237fc4 | 754 | ret = cio_validate_subchannel(&console_subchannel, schid); |
1da177e4 LT |
755 | if (ret) { |
756 | console_subchannel_in_use = 0; | |
757 | return ERR_PTR(-ENODEV); | |
758 | } | |
759 | ||
760 | /* | |
761 | * enable console I/O-interrupt subclass 7 | |
762 | */ | |
763 | ctl_set_bit(6, 24); | |
764 | console_subchannel.schib.pmcw.isc = 7; | |
765 | console_subchannel.schib.pmcw.intparm = | |
766 | (__u32)(unsigned long)&console_subchannel; | |
767 | ret = cio_modify(&console_subchannel); | |
768 | if (ret) { | |
769 | console_subchannel_in_use = 0; | |
770 | return ERR_PTR(ret); | |
771 | } | |
772 | return &console_subchannel; | |
773 | } | |
774 | ||
775 | void | |
776 | cio_release_console(void) | |
777 | { | |
778 | console_subchannel.schib.pmcw.intparm = 0; | |
779 | cio_modify(&console_subchannel); | |
780 | ctl_clear_bit(6, 24); | |
781 | console_subchannel_in_use = 0; | |
782 | } | |
783 | ||
784 | /* Bah... hack to catch console special sausages. */ | |
785 | int | |
a8237fc4 | 786 | cio_is_console(struct subchannel_id schid) |
1da177e4 LT |
787 | { |
788 | if (!console_subchannel_in_use) | |
789 | return 0; | |
a8237fc4 | 790 | return schid_equal(&schid, &console_subchannel.schid); |
1da177e4 LT |
791 | } |
792 | ||
793 | struct subchannel * | |
794 | cio_get_console_subchannel(void) | |
795 | { | |
796 | if (!console_subchannel_in_use) | |
d2c993d8 | 797 | return NULL; |
1da177e4 LT |
798 | return &console_subchannel; |
799 | } | |
800 | ||
801 | #endif | |
802 | static inline int | |
a8237fc4 | 803 | __disable_subchannel_easy(struct subchannel_id schid, struct schib *schib) |
1da177e4 LT |
804 | { |
805 | int retry, cc; | |
806 | ||
807 | cc = 0; | |
808 | for (retry=0;retry<3;retry++) { | |
809 | schib->pmcw.ena = 0; | |
810 | cc = msch(schid, schib); | |
811 | if (cc) | |
812 | return (cc==3?-ENODEV:-EBUSY); | |
813 | stsch(schid, schib); | |
814 | if (!schib->pmcw.ena) | |
815 | return 0; | |
816 | } | |
817 | return -EBUSY; /* uhm... */ | |
818 | } | |
819 | ||
820 | static inline int | |
a8237fc4 | 821 | __clear_subchannel_easy(struct subchannel_id schid) |
1da177e4 LT |
822 | { |
823 | int retry; | |
824 | ||
825 | if (csch(schid)) | |
826 | return -ENODEV; | |
827 | for (retry=0;retry<20;retry++) { | |
828 | struct tpi_info ti; | |
829 | ||
830 | if (tpi(&ti)) { | |
a8237fc4 CH |
831 | tsch(ti.schid, (struct irb *)__LC_IRB); |
832 | if (schid_equal(&ti.schid, &schid)) | |
4c24da79 | 833 | return 0; |
1da177e4 LT |
834 | } |
835 | udelay(100); | |
836 | } | |
837 | return -EBUSY; | |
838 | } | |
839 | ||
ff6b8ea6 MH |
840 | struct sch_match_id { |
841 | struct subchannel_id schid; | |
842 | struct ccw_dev_id devid; | |
843 | int rc; | |
844 | }; | |
845 | ||
846 | static int __shutdown_subchannel_easy_and_match(struct subchannel_id schid, | |
847 | void *data) | |
f97a56fb CH |
848 | { |
849 | struct schib schib; | |
ff6b8ea6 | 850 | struct sch_match_id *match_id = data; |
f97a56fb | 851 | |
fb6958a5 | 852 | if (stsch_err(schid, &schib)) |
f97a56fb | 853 | return -ENXIO; |
ff6b8ea6 MH |
854 | if (match_id && schib.pmcw.dnv && |
855 | (schib.pmcw.dev == match_id->devid.devno) && | |
856 | (schid.ssid == match_id->devid.ssid)) { | |
857 | match_id->schid = schid; | |
858 | match_id->rc = 0; | |
859 | } | |
f97a56fb CH |
860 | if (!schib.pmcw.ena) |
861 | return 0; | |
862 | switch(__disable_subchannel_easy(schid, &schib)) { | |
863 | case 0: | |
864 | case -ENODEV: | |
865 | break; | |
866 | default: /* -EBUSY */ | |
867 | if (__clear_subchannel_easy(schid)) | |
868 | break; /* give up... */ | |
869 | stsch(schid, &schib); | |
870 | __disable_subchannel_easy(schid, &schib); | |
871 | } | |
872 | return 0; | |
873 | } | |
1da177e4 | 874 | |
ff6b8ea6 MH |
875 | static int clear_all_subchannels_and_match(struct ccw_dev_id *devid, |
876 | struct subchannel_id *schid) | |
1da177e4 | 877 | { |
ff6b8ea6 MH |
878 | struct sch_match_id match_id; |
879 | ||
880 | match_id.devid = *devid; | |
881 | match_id.rc = -ENODEV; | |
1da177e4 | 882 | local_irq_disable(); |
ff6b8ea6 MH |
883 | for_each_subchannel(__shutdown_subchannel_easy_and_match, &match_id); |
884 | if (match_id.rc == 0) | |
885 | *schid = match_id.schid; | |
886 | return match_id.rc; | |
1da177e4 LT |
887 | } |
888 | ||
ff6b8ea6 MH |
889 | |
890 | void clear_all_subchannels(void) | |
891 | { | |
892 | local_irq_disable(); | |
893 | for_each_subchannel(__shutdown_subchannel_easy_and_match, NULL); | |
894 | } | |
895 | ||
896 | extern void do_reipl_asm(__u32 schid); | |
897 | ||
1da177e4 | 898 | /* Make sure all subchannels are quiet before we re-ipl an lpar. */ |
ff6b8ea6 | 899 | void reipl_ccw_dev(struct ccw_dev_id *devid) |
1da177e4 | 900 | { |
ff6b8ea6 MH |
901 | struct subchannel_id schid; |
902 | ||
903 | if (clear_all_subchannels_and_match(devid, &schid)) | |
904 | panic("IPL Device not found\n"); | |
7e560814 | 905 | cio_reset_channel_paths(); |
ff6b8ea6 | 906 | do_reipl_asm(*((__u32*)&schid)); |
1da177e4 | 907 | } |
e87bfe51 HC |
908 | |
909 | extern struct schib ipl_schib; | |
910 | ||
911 | /* | |
912 | * ipl_save_parameters gets called very early. It is not allowed to access | |
913 | * anything in the bss section at all. The bss section is not cleared yet, | |
914 | * but may contain some ipl parameters written by the firmware. | |
915 | * These parameters (if present) are copied to 0x2000. | |
916 | * To avoid corruption of the ipl parameters, all variables used by this | |
917 | * function must reside on the stack or in the data section. | |
918 | */ | |
919 | void ipl_save_parameters(void) | |
920 | { | |
921 | struct subchannel_id schid; | |
922 | unsigned int *ipl_ptr; | |
923 | void *src, *dst; | |
924 | ||
925 | schid = *(struct subchannel_id *)__LC_SUBCHANNEL_ID; | |
926 | if (!schid.one) | |
927 | return; | |
928 | if (stsch(schid, &ipl_schib)) | |
929 | return; | |
930 | if (!ipl_schib.pmcw.dnv) | |
931 | return; | |
932 | ipl_devno = ipl_schib.pmcw.dev; | |
933 | ipl_flags |= IPL_DEVNO_VALID; | |
934 | if (!ipl_schib.pmcw.qf) | |
935 | return; | |
936 | ipl_flags |= IPL_PARMBLOCK_VALID; | |
937 | ipl_ptr = (unsigned int *)__LC_IPL_PARMBLOCK_PTR; | |
938 | src = (void *)(unsigned long)*ipl_ptr; | |
939 | dst = (void *)IPL_PARMBLOCK_ORIGIN; | |
940 | memmove(dst, src, PAGE_SIZE); | |
941 | *ipl_ptr = IPL_PARMBLOCK_ORIGIN; | |
942 | } |