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