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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 | |
4c24da79 | 4 | * $Revision: 1.135 $ |
1da177e4 LT |
5 | * |
6 | * Copyright (C) 1999-2002 IBM Deutschland Entwicklung GmbH, | |
7 | * IBM Corporation | |
8 | * Author(s): Ingo Adlung (adlung@de.ibm.com) | |
9 | * Cornelia Huck (cohuck@de.ibm.com) | |
10 | * Arnd Bergmann (arndb@de.ibm.com) | |
11 | * Martin Schwidefsky (schwidefsky@de.ibm.com) | |
12 | */ | |
13 | ||
14 | #include <linux/module.h> | |
15 | #include <linux/config.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/device.h> | |
19 | #include <linux/kernel_stat.h> | |
20 | #include <linux/interrupt.h> | |
21 | ||
22 | #include <asm/cio.h> | |
23 | #include <asm/delay.h> | |
24 | #include <asm/irq.h> | |
25 | ||
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" | |
33 | ||
34 | debug_info_t *cio_debug_msg_id; | |
35 | debug_info_t *cio_debug_trace_id; | |
36 | debug_info_t *cio_debug_crw_id; | |
37 | ||
38 | int cio_show_msg; | |
39 | ||
40 | static int __init | |
41 | cio_setup (char *parm) | |
42 | { | |
43 | if (!strcmp (parm, "yes")) | |
44 | cio_show_msg = 1; | |
45 | else if (!strcmp (parm, "no")) | |
46 | cio_show_msg = 0; | |
47 | else | |
48 | printk (KERN_ERR "cio_setup : invalid cio_msg parameter '%s'", | |
49 | parm); | |
50 | return 1; | |
51 | } | |
52 | ||
53 | __setup ("cio_msg=", cio_setup); | |
54 | ||
55 | /* | |
56 | * Function: cio_debug_init | |
57 | * Initializes three debug logs (under /proc/s390dbf) for common I/O: | |
58 | * - cio_msg logs the messages which are printk'ed when CONFIG_DEBUG_IO is on | |
59 | * - cio_trace logs the calling of different functions | |
60 | * - cio_crw logs the messages which are printk'ed when CONFIG_DEBUG_CRW is on | |
61 | * debug levels depend on CONFIG_DEBUG_IO resp. CONFIG_DEBUG_CRW | |
62 | */ | |
63 | static int __init | |
64 | cio_debug_init (void) | |
65 | { | |
66a464db | 66 | cio_debug_msg_id = debug_register ("cio_msg", 16, 4, 16*sizeof (long)); |
1da177e4 LT |
67 | if (!cio_debug_msg_id) |
68 | goto out_unregister; | |
69 | debug_register_view (cio_debug_msg_id, &debug_sprintf_view); | |
70 | debug_set_level (cio_debug_msg_id, 2); | |
66a464db | 71 | cio_debug_trace_id = debug_register ("cio_trace", 16, 4, 8); |
1da177e4 LT |
72 | if (!cio_debug_trace_id) |
73 | goto out_unregister; | |
74 | debug_register_view (cio_debug_trace_id, &debug_hex_ascii_view); | |
75 | debug_set_level (cio_debug_trace_id, 2); | |
66a464db | 76 | cio_debug_crw_id = debug_register ("cio_crw", 4, 4, 16*sizeof (long)); |
1da177e4 LT |
77 | if (!cio_debug_crw_id) |
78 | goto out_unregister; | |
79 | debug_register_view (cio_debug_crw_id, &debug_sprintf_view); | |
80 | debug_set_level (cio_debug_crw_id, 2); | |
81 | pr_debug("debugging initialized\n"); | |
82 | return 0; | |
83 | ||
84 | out_unregister: | |
85 | if (cio_debug_msg_id) | |
86 | debug_unregister (cio_debug_msg_id); | |
87 | if (cio_debug_trace_id) | |
88 | debug_unregister (cio_debug_trace_id); | |
89 | if (cio_debug_crw_id) | |
90 | debug_unregister (cio_debug_crw_id); | |
91 | pr_debug("could not initialize debugging\n"); | |
92 | return -1; | |
93 | } | |
94 | ||
95 | arch_initcall (cio_debug_init); | |
96 | ||
97 | int | |
98 | cio_set_options (struct subchannel *sch, int flags) | |
99 | { | |
100 | sch->options.suspend = (flags & DOIO_ALLOW_SUSPEND) != 0; | |
101 | sch->options.prefetch = (flags & DOIO_DENY_PREFETCH) != 0; | |
102 | sch->options.inter = (flags & DOIO_SUPPRESS_INTER) != 0; | |
103 | return 0; | |
104 | } | |
105 | ||
106 | /* FIXME: who wants to use this? */ | |
107 | int | |
108 | cio_get_options (struct subchannel *sch) | |
109 | { | |
110 | int flags; | |
111 | ||
112 | flags = 0; | |
113 | if (sch->options.suspend) | |
114 | flags |= DOIO_ALLOW_SUSPEND; | |
115 | if (sch->options.prefetch) | |
116 | flags |= DOIO_DENY_PREFETCH; | |
117 | if (sch->options.inter) | |
118 | flags |= DOIO_SUPPRESS_INTER; | |
119 | return flags; | |
120 | } | |
121 | ||
122 | /* | |
123 | * Use tpi to get a pending interrupt, call the interrupt handler and | |
124 | * return a pointer to the subchannel structure. | |
125 | */ | |
126 | static inline int | |
127 | cio_tpi(void) | |
128 | { | |
129 | struct tpi_info *tpi_info; | |
130 | struct subchannel *sch; | |
131 | struct irb *irb; | |
132 | ||
133 | tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID; | |
134 | if (tpi (NULL) != 1) | |
135 | return 0; | |
136 | irb = (struct irb *) __LC_IRB; | |
137 | /* Store interrupt response block to lowcore. */ | |
a8237fc4 | 138 | if (tsch (tpi_info->schid, irb) != 0) |
1da177e4 LT |
139 | /* Not status pending or not operational. */ |
140 | return 1; | |
141 | sch = (struct subchannel *)(unsigned long)tpi_info->intparm; | |
142 | if (!sch) | |
143 | return 1; | |
144 | local_bh_disable(); | |
145 | irq_enter (); | |
146 | spin_lock(&sch->lock); | |
147 | memcpy (&sch->schib.scsw, &irb->scsw, sizeof (struct scsw)); | |
148 | if (sch->driver && sch->driver->irq) | |
149 | sch->driver->irq(&sch->dev); | |
150 | spin_unlock(&sch->lock); | |
151 | irq_exit (); | |
152 | __local_bh_enable(); | |
153 | return 1; | |
154 | } | |
155 | ||
156 | static inline int | |
157 | cio_start_handle_notoper(struct subchannel *sch, __u8 lpm) | |
158 | { | |
159 | char dbf_text[15]; | |
160 | ||
161 | if (lpm != 0) | |
162 | sch->lpm &= ~lpm; | |
163 | else | |
164 | sch->lpm = 0; | |
165 | ||
a8237fc4 | 166 | stsch (sch->schid, &sch->schib); |
1da177e4 LT |
167 | |
168 | CIO_MSG_EVENT(0, "cio_start: 'not oper' status for " | |
a8237fc4 | 169 | "subchannel %04x!\n", sch->schid.sch_no); |
1da177e4 LT |
170 | sprintf(dbf_text, "no%s", sch->dev.bus_id); |
171 | CIO_TRACE_EVENT(0, dbf_text); | |
172 | CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib)); | |
173 | ||
174 | return (sch->lpm ? -EACCES : -ENODEV); | |
175 | } | |
176 | ||
177 | int | |
178 | cio_start_key (struct subchannel *sch, /* subchannel structure */ | |
179 | struct ccw1 * cpa, /* logical channel prog addr */ | |
180 | __u8 lpm, /* logical path mask */ | |
181 | __u8 key) /* storage key */ | |
182 | { | |
183 | char dbf_txt[15]; | |
184 | int ccode; | |
185 | ||
186 | CIO_TRACE_EVENT (4, "stIO"); | |
187 | CIO_TRACE_EVENT (4, sch->dev.bus_id); | |
188 | ||
189 | /* sch is always under 2G. */ | |
190 | sch->orb.intparm = (__u32)(unsigned long)sch; | |
191 | sch->orb.fmt = 1; | |
192 | ||
193 | sch->orb.pfch = sch->options.prefetch == 0; | |
194 | sch->orb.spnd = sch->options.suspend; | |
195 | sch->orb.ssic = sch->options.suspend && sch->options.inter; | |
196 | sch->orb.lpm = (lpm != 0) ? (lpm & sch->opm) : sch->lpm; | |
197 | #ifdef CONFIG_ARCH_S390X | |
198 | /* | |
199 | * for 64 bit we always support 64 bit IDAWs with 4k page size only | |
200 | */ | |
201 | sch->orb.c64 = 1; | |
202 | sch->orb.i2k = 0; | |
203 | #endif | |
204 | sch->orb.key = key >> 4; | |
205 | /* issue "Start Subchannel" */ | |
206 | sch->orb.cpa = (__u32) __pa (cpa); | |
a8237fc4 | 207 | ccode = ssch (sch->schid, &sch->orb); |
1da177e4 LT |
208 | |
209 | /* process condition code */ | |
210 | sprintf (dbf_txt, "ccode:%d", ccode); | |
211 | CIO_TRACE_EVENT (4, dbf_txt); | |
212 | ||
213 | switch (ccode) { | |
214 | case 0: | |
215 | /* | |
216 | * initialize device status information | |
217 | */ | |
218 | sch->schib.scsw.actl |= SCSW_ACTL_START_PEND; | |
219 | return 0; | |
220 | case 1: /* status pending */ | |
221 | case 2: /* busy */ | |
222 | return -EBUSY; | |
223 | default: /* device/path not operational */ | |
224 | return cio_start_handle_notoper(sch, lpm); | |
225 | } | |
226 | } | |
227 | ||
228 | int | |
229 | cio_start (struct subchannel *sch, struct ccw1 *cpa, __u8 lpm) | |
230 | { | |
0b642ede | 231 | return cio_start_key(sch, cpa, lpm, PAGE_DEFAULT_KEY); |
1da177e4 LT |
232 | } |
233 | ||
234 | /* | |
235 | * resume suspended I/O operation | |
236 | */ | |
237 | int | |
238 | cio_resume (struct subchannel *sch) | |
239 | { | |
240 | char dbf_txt[15]; | |
241 | int ccode; | |
242 | ||
243 | CIO_TRACE_EVENT (4, "resIO"); | |
244 | CIO_TRACE_EVENT (4, sch->dev.bus_id); | |
245 | ||
a8237fc4 | 246 | ccode = rsch (sch->schid); |
1da177e4 LT |
247 | |
248 | sprintf (dbf_txt, "ccode:%d", ccode); | |
249 | CIO_TRACE_EVENT (4, dbf_txt); | |
250 | ||
251 | switch (ccode) { | |
252 | case 0: | |
253 | sch->schib.scsw.actl |= SCSW_ACTL_RESUME_PEND; | |
254 | return 0; | |
255 | case 1: | |
256 | return -EBUSY; | |
257 | case 2: | |
258 | return -EINVAL; | |
259 | default: | |
260 | /* | |
261 | * useless to wait for request completion | |
262 | * as device is no longer operational ! | |
263 | */ | |
264 | return -ENODEV; | |
265 | } | |
266 | } | |
267 | ||
268 | /* | |
269 | * halt I/O operation | |
270 | */ | |
271 | int | |
272 | cio_halt(struct subchannel *sch) | |
273 | { | |
274 | char dbf_txt[15]; | |
275 | int ccode; | |
276 | ||
277 | if (!sch) | |
278 | return -ENODEV; | |
279 | ||
280 | CIO_TRACE_EVENT (2, "haltIO"); | |
281 | CIO_TRACE_EVENT (2, sch->dev.bus_id); | |
282 | ||
283 | /* | |
284 | * Issue "Halt subchannel" and process condition code | |
285 | */ | |
a8237fc4 | 286 | ccode = hsch (sch->schid); |
1da177e4 LT |
287 | |
288 | sprintf (dbf_txt, "ccode:%d", ccode); | |
289 | CIO_TRACE_EVENT (2, dbf_txt); | |
290 | ||
291 | switch (ccode) { | |
292 | case 0: | |
293 | sch->schib.scsw.actl |= SCSW_ACTL_HALT_PEND; | |
294 | return 0; | |
295 | case 1: /* status pending */ | |
296 | case 2: /* busy */ | |
297 | return -EBUSY; | |
298 | default: /* device not operational */ | |
299 | return -ENODEV; | |
300 | } | |
301 | } | |
302 | ||
303 | /* | |
304 | * Clear I/O operation | |
305 | */ | |
306 | int | |
307 | cio_clear(struct subchannel *sch) | |
308 | { | |
309 | char dbf_txt[15]; | |
310 | int ccode; | |
311 | ||
312 | if (!sch) | |
313 | return -ENODEV; | |
314 | ||
315 | CIO_TRACE_EVENT (2, "clearIO"); | |
316 | CIO_TRACE_EVENT (2, sch->dev.bus_id); | |
317 | ||
318 | /* | |
319 | * Issue "Clear subchannel" and process condition code | |
320 | */ | |
a8237fc4 | 321 | ccode = csch (sch->schid); |
1da177e4 LT |
322 | |
323 | sprintf (dbf_txt, "ccode:%d", ccode); | |
324 | CIO_TRACE_EVENT (2, dbf_txt); | |
325 | ||
326 | switch (ccode) { | |
327 | case 0: | |
328 | sch->schib.scsw.actl |= SCSW_ACTL_CLEAR_PEND; | |
329 | return 0; | |
330 | default: /* device not operational */ | |
331 | return -ENODEV; | |
332 | } | |
333 | } | |
334 | ||
335 | /* | |
336 | * Function: cio_cancel | |
337 | * Issues a "Cancel Subchannel" on the specified subchannel | |
338 | * Note: We don't need any fancy intparms and flags here | |
339 | * since xsch is executed synchronously. | |
340 | * Only for common I/O internal use as for now. | |
341 | */ | |
342 | int | |
343 | cio_cancel (struct subchannel *sch) | |
344 | { | |
345 | char dbf_txt[15]; | |
346 | int ccode; | |
347 | ||
348 | if (!sch) | |
349 | return -ENODEV; | |
350 | ||
351 | CIO_TRACE_EVENT (2, "cancelIO"); | |
352 | CIO_TRACE_EVENT (2, sch->dev.bus_id); | |
353 | ||
a8237fc4 | 354 | ccode = xsch (sch->schid); |
1da177e4 LT |
355 | |
356 | sprintf (dbf_txt, "ccode:%d", ccode); | |
357 | CIO_TRACE_EVENT (2, dbf_txt); | |
358 | ||
359 | switch (ccode) { | |
360 | case 0: /* success */ | |
361 | /* Update information in scsw. */ | |
a8237fc4 | 362 | stsch (sch->schid, &sch->schib); |
1da177e4 LT |
363 | return 0; |
364 | case 1: /* status pending */ | |
365 | return -EBUSY; | |
366 | case 2: /* not applicable */ | |
367 | return -EINVAL; | |
368 | default: /* not oper */ | |
369 | return -ENODEV; | |
370 | } | |
371 | } | |
372 | ||
373 | /* | |
374 | * Function: cio_modify | |
375 | * Issues a "Modify Subchannel" on the specified subchannel | |
376 | */ | |
377 | int | |
378 | cio_modify (struct subchannel *sch) | |
379 | { | |
380 | int ccode, retry, ret; | |
381 | ||
382 | ret = 0; | |
383 | for (retry = 0; retry < 5; retry++) { | |
a8237fc4 | 384 | ccode = msch_err (sch->schid, &sch->schib); |
1da177e4 LT |
385 | if (ccode < 0) /* -EIO if msch gets a program check. */ |
386 | return ccode; | |
387 | switch (ccode) { | |
388 | case 0: /* successfull */ | |
389 | return 0; | |
390 | case 1: /* status pending */ | |
391 | return -EBUSY; | |
392 | case 2: /* busy */ | |
393 | udelay (100); /* allow for recovery */ | |
394 | ret = -EBUSY; | |
395 | break; | |
396 | case 3: /* not operational */ | |
397 | return -ENODEV; | |
398 | } | |
399 | } | |
400 | return ret; | |
401 | } | |
402 | ||
403 | /* | |
404 | * Enable subchannel. | |
405 | */ | |
406 | int | |
407 | cio_enable_subchannel (struct subchannel *sch, unsigned int isc) | |
408 | { | |
409 | char dbf_txt[15]; | |
410 | int ccode; | |
411 | int retry; | |
412 | int ret; | |
413 | ||
414 | CIO_TRACE_EVENT (2, "ensch"); | |
415 | CIO_TRACE_EVENT (2, sch->dev.bus_id); | |
416 | ||
a8237fc4 | 417 | ccode = stsch (sch->schid, &sch->schib); |
1da177e4 LT |
418 | if (ccode) |
419 | return -ENODEV; | |
420 | ||
421 | for (retry = 5, ret = 0; retry > 0; retry--) { | |
422 | sch->schib.pmcw.ena = 1; | |
423 | sch->schib.pmcw.isc = isc; | |
424 | sch->schib.pmcw.intparm = (__u32)(unsigned long)sch; | |
425 | ret = cio_modify(sch); | |
426 | if (ret == -ENODEV) | |
427 | break; | |
428 | if (ret == -EIO) | |
429 | /* | |
430 | * Got a program check in cio_modify. Try without | |
431 | * the concurrent sense bit the next time. | |
432 | */ | |
433 | sch->schib.pmcw.csense = 0; | |
434 | if (ret == 0) { | |
a8237fc4 | 435 | stsch (sch->schid, &sch->schib); |
1da177e4 LT |
436 | if (sch->schib.pmcw.ena) |
437 | break; | |
438 | } | |
439 | if (ret == -EBUSY) { | |
440 | struct irb irb; | |
a8237fc4 | 441 | if (tsch(sch->schid, &irb) != 0) |
1da177e4 LT |
442 | break; |
443 | } | |
444 | } | |
445 | sprintf (dbf_txt, "ret:%d", ret); | |
446 | CIO_TRACE_EVENT (2, dbf_txt); | |
447 | return ret; | |
448 | } | |
449 | ||
450 | /* | |
451 | * Disable subchannel. | |
452 | */ | |
453 | int | |
454 | cio_disable_subchannel (struct subchannel *sch) | |
455 | { | |
456 | char dbf_txt[15]; | |
457 | int ccode; | |
458 | int retry; | |
459 | int ret; | |
460 | ||
461 | CIO_TRACE_EVENT (2, "dissch"); | |
462 | CIO_TRACE_EVENT (2, sch->dev.bus_id); | |
463 | ||
a8237fc4 | 464 | ccode = stsch (sch->schid, &sch->schib); |
1da177e4 LT |
465 | if (ccode == 3) /* Not operational. */ |
466 | return -ENODEV; | |
467 | ||
468 | if (sch->schib.scsw.actl != 0) | |
469 | /* | |
470 | * the disable function must not be called while there are | |
471 | * requests pending for completion ! | |
472 | */ | |
473 | return -EBUSY; | |
474 | ||
475 | for (retry = 5, ret = 0; retry > 0; retry--) { | |
476 | sch->schib.pmcw.ena = 0; | |
477 | ret = cio_modify(sch); | |
478 | if (ret == -ENODEV) | |
479 | break; | |
480 | if (ret == -EBUSY) | |
481 | /* | |
482 | * The subchannel is busy or status pending. | |
483 | * We'll disable when the next interrupt was delivered | |
484 | * via the state machine. | |
485 | */ | |
486 | break; | |
487 | if (ret == 0) { | |
a8237fc4 | 488 | stsch (sch->schid, &sch->schib); |
1da177e4 LT |
489 | if (!sch->schib.pmcw.ena) |
490 | break; | |
491 | } | |
492 | } | |
493 | sprintf (dbf_txt, "ret:%d", ret); | |
494 | CIO_TRACE_EVENT (2, dbf_txt); | |
495 | return ret; | |
496 | } | |
497 | ||
498 | /* | |
499 | * cio_validate_subchannel() | |
500 | * | |
501 | * Find out subchannel type and initialize struct subchannel. | |
502 | * Return codes: | |
503 | * SUBCHANNEL_TYPE_IO for a normal io subchannel | |
504 | * SUBCHANNEL_TYPE_CHSC for a chsc subchannel | |
505 | * SUBCHANNEL_TYPE_MESSAGE for a messaging subchannel | |
506 | * SUBCHANNEL_TYPE_ADM for a adm(?) subchannel | |
507 | * -ENXIO for non-defined subchannels | |
508 | * -ENODEV for subchannels with invalid device number or blacklisted devices | |
509 | */ | |
510 | int | |
a8237fc4 | 511 | cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid) |
1da177e4 LT |
512 | { |
513 | char dbf_txt[15]; | |
514 | int ccode; | |
515 | ||
a8237fc4 | 516 | sprintf (dbf_txt, "valsch%x", schid.sch_no); |
1da177e4 LT |
517 | CIO_TRACE_EVENT (4, dbf_txt); |
518 | ||
519 | /* Nuke all fields. */ | |
520 | memset(sch, 0, sizeof(struct subchannel)); | |
521 | ||
522 | spin_lock_init(&sch->lock); | |
523 | ||
524 | /* Set a name for the subchannel */ | |
a8237fc4 | 525 | snprintf (sch->dev.bus_id, BUS_ID_SIZE, "0.0.%04x", 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. | |
530 | */ | |
a8237fc4 | 531 | ccode = stsch (schid, &sch->schib); |
1da177e4 LT |
532 | if (ccode) |
533 | return -ENXIO; | |
534 | ||
a8237fc4 | 535 | sch->schid = schid; |
1da177e4 LT |
536 | /* Copy subchannel type from path management control word. */ |
537 | sch->st = sch->schib.pmcw.st; | |
538 | ||
539 | /* | |
540 | * ... just being curious we check for non I/O subchannels | |
541 | */ | |
542 | if (sch->st != 0) { | |
543 | CIO_DEBUG(KERN_INFO, 0, | |
544 | "Subchannel %04X reports " | |
545 | "non-I/O subchannel type %04X\n", | |
a8237fc4 | 546 | sch->schid.sch_no, sch->st); |
1da177e4 LT |
547 | /* We stop here for non-io subchannels. */ |
548 | return sch->st; | |
549 | } | |
550 | ||
551 | /* Initialization for io subchannels. */ | |
552 | if (!sch->schib.pmcw.dnv) | |
553 | /* io subchannel but device number is invalid. */ | |
554 | return -ENODEV; | |
555 | ||
556 | /* Devno is valid. */ | |
557 | if (is_blacklisted (sch->schib.pmcw.dev)) { | |
558 | /* | |
559 | * This device must not be known to Linux. So we simply | |
560 | * say that there is no device and return ENODEV. | |
561 | */ | |
562 | CIO_MSG_EVENT(0, "Blacklisted device detected " | |
563 | "at devno %04X\n", sch->schib.pmcw.dev); | |
564 | return -ENODEV; | |
565 | } | |
566 | sch->opm = 0xff; | |
567 | chsc_validate_chpids(sch); | |
568 | sch->lpm = sch->schib.pmcw.pim & | |
569 | sch->schib.pmcw.pam & | |
570 | sch->schib.pmcw.pom & | |
571 | sch->opm; | |
572 | ||
573 | CIO_DEBUG(KERN_INFO, 0, | |
574 | "Detected device %04X on subchannel %04X" | |
575 | " - PIM = %02X, PAM = %02X, POM = %02X\n", | |
a8237fc4 | 576 | sch->schib.pmcw.dev, sch->schid.sch_no, sch->schib.pmcw.pim, |
1da177e4 LT |
577 | sch->schib.pmcw.pam, sch->schib.pmcw.pom); |
578 | ||
579 | /* | |
580 | * We now have to initially ... | |
581 | * ... set "interruption subclass" | |
582 | * ... enable "concurrent sense" | |
583 | * ... enable "multipath mode" if more than one | |
584 | * CHPID is available. This is done regardless | |
585 | * whether multiple paths are available for us. | |
586 | */ | |
587 | sch->schib.pmcw.isc = 3; /* could be smth. else */ | |
588 | sch->schib.pmcw.csense = 1; /* concurrent sense */ | |
589 | sch->schib.pmcw.ena = 0; | |
590 | if ((sch->lpm & (sch->lpm - 1)) != 0) | |
591 | sch->schib.pmcw.mp = 1; /* multipath mode */ | |
592 | return 0; | |
593 | } | |
594 | ||
595 | /* | |
596 | * do_IRQ() handles all normal I/O device IRQ's (the special | |
597 | * SMP cross-CPU interrupts have their own specific | |
598 | * handlers). | |
599 | * | |
600 | */ | |
601 | void | |
602 | do_IRQ (struct pt_regs *regs) | |
603 | { | |
604 | struct tpi_info *tpi_info; | |
605 | struct subchannel *sch; | |
606 | struct irb *irb; | |
607 | ||
608 | irq_enter (); | |
609 | asm volatile ("mc 0,0"); | |
610 | if (S390_lowcore.int_clock >= S390_lowcore.jiffy_timer) | |
611 | /** | |
612 | * Make sure that the i/o interrupt did not "overtake" | |
613 | * the last HZ timer interrupt. | |
614 | */ | |
615 | account_ticks(regs); | |
616 | /* | |
617 | * Get interrupt information from lowcore | |
618 | */ | |
619 | tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID; | |
620 | irb = (struct irb *) __LC_IRB; | |
621 | do { | |
622 | kstat_cpu(smp_processor_id()).irqs[IO_INTERRUPT]++; | |
623 | /* | |
624 | * Non I/O-subchannel thin interrupts are processed differently | |
625 | */ | |
626 | if (tpi_info->adapter_IO == 1 && | |
627 | tpi_info->int_type == IO_INTERRUPT_TYPE) { | |
628 | do_adapter_IO(); | |
629 | continue; | |
630 | } | |
631 | sch = (struct subchannel *)(unsigned long)tpi_info->intparm; | |
632 | if (sch) | |
633 | spin_lock(&sch->lock); | |
634 | /* Store interrupt response block to lowcore. */ | |
a8237fc4 | 635 | if (tsch (tpi_info->schid, irb) == 0 && sch) { |
1da177e4 LT |
636 | /* Keep subchannel information word up to date. */ |
637 | memcpy (&sch->schib.scsw, &irb->scsw, | |
638 | sizeof (irb->scsw)); | |
639 | /* Call interrupt handler if there is one. */ | |
640 | if (sch->driver && sch->driver->irq) | |
641 | sch->driver->irq(&sch->dev); | |
642 | } | |
643 | if (sch) | |
644 | spin_unlock(&sch->lock); | |
645 | /* | |
646 | * Are more interrupts pending? | |
647 | * If so, the tpi instruction will update the lowcore | |
648 | * to hold the info for the next interrupt. | |
649 | * We don't do this for VM because a tpi drops the cpu | |
650 | * out of the sie which costs more cycles than it saves. | |
651 | */ | |
652 | } while (!MACHINE_IS_VM && tpi (NULL) != 0); | |
653 | irq_exit (); | |
654 | } | |
655 | ||
656 | #ifdef CONFIG_CCW_CONSOLE | |
657 | static struct subchannel console_subchannel; | |
658 | static int console_subchannel_in_use; | |
659 | ||
660 | /* | |
661 | * busy wait for the next interrupt on the console | |
662 | */ | |
663 | void | |
664 | wait_cons_dev (void) | |
665 | { | |
666 | unsigned long cr6 __attribute__ ((aligned (8))); | |
667 | unsigned long save_cr6 __attribute__ ((aligned (8))); | |
668 | ||
669 | /* | |
670 | * before entering the spinlock we may already have | |
671 | * processed the interrupt on a different CPU... | |
672 | */ | |
673 | if (!console_subchannel_in_use) | |
674 | return; | |
675 | ||
676 | /* disable all but isc 7 (console device) */ | |
677 | __ctl_store (save_cr6, 6, 6); | |
678 | cr6 = 0x01000000; | |
679 | __ctl_load (cr6, 6, 6); | |
680 | ||
681 | do { | |
682 | spin_unlock(&console_subchannel.lock); | |
683 | if (!cio_tpi()) | |
684 | cpu_relax(); | |
685 | spin_lock(&console_subchannel.lock); | |
686 | } while (console_subchannel.schib.scsw.actl != 0); | |
687 | /* | |
688 | * restore previous isc value | |
689 | */ | |
690 | __ctl_load (save_cr6, 6, 6); | |
691 | } | |
692 | ||
693 | static int | |
f97a56fb CH |
694 | cio_test_for_console(struct subchannel_id schid, void *data) |
695 | { | |
696 | if (stsch(schid, &console_subchannel.schib) != 0) | |
697 | return -ENXIO; | |
698 | if (console_subchannel.schib.pmcw.dnv && | |
699 | console_subchannel.schib.pmcw.dev == | |
700 | console_devno) { | |
701 | console_irq = schid.sch_no; | |
702 | return 1; /* found */ | |
703 | } | |
704 | return 0; | |
705 | } | |
706 | ||
707 | ||
708 | static int | |
709 | cio_get_console_sch_no(void) | |
1da177e4 | 710 | { |
a8237fc4 | 711 | struct subchannel_id schid; |
1da177e4 | 712 | |
a8237fc4 | 713 | init_subchannel_id(&schid); |
1da177e4 LT |
714 | if (console_irq != -1) { |
715 | /* VM provided us with the irq number of the console. */ | |
a8237fc4 CH |
716 | schid.sch_no = console_irq; |
717 | if (stsch(schid, &console_subchannel.schib) != 0 || | |
1da177e4 LT |
718 | !console_subchannel.schib.pmcw.dnv) |
719 | return -1; | |
720 | console_devno = console_subchannel.schib.pmcw.dev; | |
721 | } else if (console_devno != -1) { | |
722 | /* At least the console device number is known. */ | |
f97a56fb | 723 | for_each_subchannel(cio_test_for_console, NULL); |
1da177e4 LT |
724 | if (console_irq == -1) |
725 | return -1; | |
726 | } else { | |
727 | /* unlike in 2.4, we cannot autoprobe here, since | |
728 | * the channel subsystem is not fully initialized. | |
729 | * With some luck, the HWC console can take over */ | |
730 | printk(KERN_WARNING "No ccw console found!\n"); | |
731 | return -1; | |
732 | } | |
733 | return console_irq; | |
734 | } | |
735 | ||
736 | struct subchannel * | |
737 | cio_probe_console(void) | |
738 | { | |
f97a56fb | 739 | int sch_no, ret; |
a8237fc4 | 740 | struct subchannel_id schid; |
1da177e4 LT |
741 | |
742 | if (xchg(&console_subchannel_in_use, 1) != 0) | |
743 | return ERR_PTR(-EBUSY); | |
f97a56fb CH |
744 | sch_no = cio_get_console_sch_no(); |
745 | if (sch_no == -1) { | |
1da177e4 LT |
746 | console_subchannel_in_use = 0; |
747 | return ERR_PTR(-ENODEV); | |
748 | } | |
749 | memset(&console_subchannel, 0, sizeof(struct subchannel)); | |
a8237fc4 | 750 | init_subchannel_id(&schid); |
f97a56fb | 751 | schid.sch_no = sch_no; |
a8237fc4 | 752 | ret = cio_validate_subchannel(&console_subchannel, schid); |
1da177e4 LT |
753 | if (ret) { |
754 | console_subchannel_in_use = 0; | |
755 | return ERR_PTR(-ENODEV); | |
756 | } | |
757 | ||
758 | /* | |
759 | * enable console I/O-interrupt subclass 7 | |
760 | */ | |
761 | ctl_set_bit(6, 24); | |
762 | console_subchannel.schib.pmcw.isc = 7; | |
763 | console_subchannel.schib.pmcw.intparm = | |
764 | (__u32)(unsigned long)&console_subchannel; | |
765 | ret = cio_modify(&console_subchannel); | |
766 | if (ret) { | |
767 | console_subchannel_in_use = 0; | |
768 | return ERR_PTR(ret); | |
769 | } | |
770 | return &console_subchannel; | |
771 | } | |
772 | ||
773 | void | |
774 | cio_release_console(void) | |
775 | { | |
776 | console_subchannel.schib.pmcw.intparm = 0; | |
777 | cio_modify(&console_subchannel); | |
778 | ctl_clear_bit(6, 24); | |
779 | console_subchannel_in_use = 0; | |
780 | } | |
781 | ||
782 | /* Bah... hack to catch console special sausages. */ | |
783 | int | |
a8237fc4 | 784 | cio_is_console(struct subchannel_id schid) |
1da177e4 LT |
785 | { |
786 | if (!console_subchannel_in_use) | |
787 | return 0; | |
a8237fc4 | 788 | return schid_equal(&schid, &console_subchannel.schid); |
1da177e4 LT |
789 | } |
790 | ||
791 | struct subchannel * | |
792 | cio_get_console_subchannel(void) | |
793 | { | |
794 | if (!console_subchannel_in_use) | |
795 | return 0; | |
796 | return &console_subchannel; | |
797 | } | |
798 | ||
799 | #endif | |
800 | static inline int | |
a8237fc4 | 801 | __disable_subchannel_easy(struct subchannel_id schid, struct schib *schib) |
1da177e4 LT |
802 | { |
803 | int retry, cc; | |
804 | ||
805 | cc = 0; | |
806 | for (retry=0;retry<3;retry++) { | |
807 | schib->pmcw.ena = 0; | |
808 | cc = msch(schid, schib); | |
809 | if (cc) | |
810 | return (cc==3?-ENODEV:-EBUSY); | |
811 | stsch(schid, schib); | |
812 | if (!schib->pmcw.ena) | |
813 | return 0; | |
814 | } | |
815 | return -EBUSY; /* uhm... */ | |
816 | } | |
817 | ||
818 | static inline int | |
a8237fc4 | 819 | __clear_subchannel_easy(struct subchannel_id schid) |
1da177e4 LT |
820 | { |
821 | int retry; | |
822 | ||
823 | if (csch(schid)) | |
824 | return -ENODEV; | |
825 | for (retry=0;retry<20;retry++) { | |
826 | struct tpi_info ti; | |
827 | ||
828 | if (tpi(&ti)) { | |
a8237fc4 CH |
829 | tsch(ti.schid, (struct irb *)__LC_IRB); |
830 | if (schid_equal(&ti.schid, &schid)) | |
4c24da79 | 831 | return 0; |
1da177e4 LT |
832 | } |
833 | udelay(100); | |
834 | } | |
835 | return -EBUSY; | |
836 | } | |
837 | ||
838 | extern void do_reipl(unsigned long devno); | |
f97a56fb CH |
839 | static int |
840 | __shutdown_subchannel_easy(struct subchannel_id schid, void *data) | |
841 | { | |
842 | struct schib schib; | |
843 | ||
844 | if (stsch(schid, &schib)) | |
845 | return -ENXIO; | |
846 | if (!schib.pmcw.ena) | |
847 | return 0; | |
848 | switch(__disable_subchannel_easy(schid, &schib)) { | |
849 | case 0: | |
850 | case -ENODEV: | |
851 | break; | |
852 | default: /* -EBUSY */ | |
853 | if (__clear_subchannel_easy(schid)) | |
854 | break; /* give up... */ | |
855 | stsch(schid, &schib); | |
856 | __disable_subchannel_easy(schid, &schib); | |
857 | } | |
858 | return 0; | |
859 | } | |
1da177e4 | 860 | |
1da177e4 LT |
861 | void |
862 | clear_all_subchannels(void) | |
863 | { | |
1da177e4 | 864 | local_irq_disable(); |
f97a56fb | 865 | for_each_subchannel(__shutdown_subchannel_easy, NULL); |
1da177e4 LT |
866 | } |
867 | ||
868 | /* Make sure all subchannels are quiet before we re-ipl an lpar. */ | |
869 | void | |
870 | reipl(unsigned long devno) | |
871 | { | |
872 | clear_all_subchannels(); | |
873 | do_reipl(devno); | |
874 | } |