Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * drivers/s390/cio/cio.c | |
3 | * S/390 common I/O routines -- low level i/o calls | |
1da177e4 | 4 | * |
0ae7a7b2 | 5 | * Copyright IBM Corp. 1999,2008 |
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> |
4e8e56c6 | 26 | #include <asm/airq.h> |
43ca5c3a | 27 | #include <asm/cpu.h> |
1da177e4 LT |
28 | #include "cio.h" |
29 | #include "css.h" | |
30 | #include "chsc.h" | |
31 | #include "ioasm.h" | |
cd6b4f27 | 32 | #include "io_sch.h" |
1da177e4 LT |
33 | #include "blacklist.h" |
34 | #include "cio_debug.h" | |
e6b6e10a | 35 | #include "chp.h" |
15e9b586 | 36 | #include "../s390mach.h" |
1da177e4 LT |
37 | |
38 | debug_info_t *cio_debug_msg_id; | |
39 | debug_info_t *cio_debug_trace_id; | |
40 | debug_info_t *cio_debug_crw_id; | |
41 | ||
1da177e4 LT |
42 | /* |
43 | * Function: cio_debug_init | |
bc698bcf CH |
44 | * Initializes three debug logs for common I/O: |
45 | * - cio_msg logs generic cio messages | |
1da177e4 | 46 | * - cio_trace logs the calling of different functions |
bc698bcf | 47 | * - cio_crw logs machine check related cio messages |
1da177e4 | 48 | */ |
bc698bcf | 49 | static int __init cio_debug_init(void) |
1da177e4 | 50 | { |
361f494d | 51 | cio_debug_msg_id = debug_register("cio_msg", 16, 1, 16 * sizeof(long)); |
1da177e4 LT |
52 | if (!cio_debug_msg_id) |
53 | goto out_unregister; | |
bc698bcf CH |
54 | debug_register_view(cio_debug_msg_id, &debug_sprintf_view); |
55 | debug_set_level(cio_debug_msg_id, 2); | |
361f494d | 56 | cio_debug_trace_id = debug_register("cio_trace", 16, 1, 16); |
1da177e4 LT |
57 | if (!cio_debug_trace_id) |
58 | goto out_unregister; | |
bc698bcf CH |
59 | debug_register_view(cio_debug_trace_id, &debug_hex_ascii_view); |
60 | debug_set_level(cio_debug_trace_id, 2); | |
361f494d | 61 | cio_debug_crw_id = debug_register("cio_crw", 16, 1, 16 * sizeof(long)); |
1da177e4 LT |
62 | if (!cio_debug_crw_id) |
63 | goto out_unregister; | |
bc698bcf CH |
64 | debug_register_view(cio_debug_crw_id, &debug_sprintf_view); |
65 | debug_set_level(cio_debug_crw_id, 4); | |
1da177e4 LT |
66 | return 0; |
67 | ||
68 | out_unregister: | |
69 | if (cio_debug_msg_id) | |
bc698bcf | 70 | debug_unregister(cio_debug_msg_id); |
1da177e4 | 71 | if (cio_debug_trace_id) |
bc698bcf | 72 | debug_unregister(cio_debug_trace_id); |
1da177e4 | 73 | if (cio_debug_crw_id) |
bc698bcf | 74 | debug_unregister(cio_debug_crw_id); |
e556bbbd | 75 | printk(KERN_WARNING"cio: could not initialize debugging\n"); |
1da177e4 LT |
76 | return -1; |
77 | } | |
78 | ||
79 | arch_initcall (cio_debug_init); | |
80 | ||
81 | int | |
82 | cio_set_options (struct subchannel *sch, int flags) | |
83 | { | |
84 | sch->options.suspend = (flags & DOIO_ALLOW_SUSPEND) != 0; | |
85 | sch->options.prefetch = (flags & DOIO_DENY_PREFETCH) != 0; | |
86 | sch->options.inter = (flags & DOIO_SUPPRESS_INTER) != 0; | |
87 | return 0; | |
88 | } | |
89 | ||
90 | /* FIXME: who wants to use this? */ | |
91 | int | |
92 | cio_get_options (struct subchannel *sch) | |
93 | { | |
94 | int flags; | |
95 | ||
96 | flags = 0; | |
97 | if (sch->options.suspend) | |
98 | flags |= DOIO_ALLOW_SUSPEND; | |
99 | if (sch->options.prefetch) | |
100 | flags |= DOIO_DENY_PREFETCH; | |
101 | if (sch->options.inter) | |
102 | flags |= DOIO_SUPPRESS_INTER; | |
103 | return flags; | |
104 | } | |
105 | ||
106 | /* | |
107 | * Use tpi to get a pending interrupt, call the interrupt handler and | |
108 | * return a pointer to the subchannel structure. | |
109 | */ | |
4d284cac | 110 | static int |
1da177e4 LT |
111 | cio_tpi(void) |
112 | { | |
113 | struct tpi_info *tpi_info; | |
114 | struct subchannel *sch; | |
115 | struct irb *irb; | |
116 | ||
117 | tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID; | |
118 | if (tpi (NULL) != 1) | |
119 | return 0; | |
120 | irb = (struct irb *) __LC_IRB; | |
121 | /* Store interrupt response block to lowcore. */ | |
a8237fc4 | 122 | if (tsch (tpi_info->schid, irb) != 0) |
1da177e4 LT |
123 | /* Not status pending or not operational. */ |
124 | return 1; | |
125 | sch = (struct subchannel *)(unsigned long)tpi_info->intparm; | |
126 | if (!sch) | |
127 | return 1; | |
128 | local_bh_disable(); | |
129 | irq_enter (); | |
2ec22984 | 130 | spin_lock(sch->lock); |
1da177e4 LT |
131 | memcpy (&sch->schib.scsw, &irb->scsw, sizeof (struct scsw)); |
132 | if (sch->driver && sch->driver->irq) | |
602b20f2 | 133 | sch->driver->irq(sch); |
2ec22984 | 134 | spin_unlock(sch->lock); |
1da177e4 | 135 | irq_exit (); |
1f194a4c | 136 | _local_bh_enable(); |
1da177e4 LT |
137 | return 1; |
138 | } | |
139 | ||
4d284cac | 140 | static int |
1da177e4 LT |
141 | cio_start_handle_notoper(struct subchannel *sch, __u8 lpm) |
142 | { | |
143 | char dbf_text[15]; | |
144 | ||
145 | if (lpm != 0) | |
146 | sch->lpm &= ~lpm; | |
147 | else | |
148 | sch->lpm = 0; | |
149 | ||
a8237fc4 | 150 | stsch (sch->schid, &sch->schib); |
1da177e4 | 151 | |
139b83dd | 152 | CIO_MSG_EVENT(2, "cio_start: 'not oper' status for " |
fb6958a5 CH |
153 | "subchannel 0.%x.%04x!\n", sch->schid.ssid, |
154 | sch->schid.sch_no); | |
1da177e4 LT |
155 | sprintf(dbf_text, "no%s", sch->dev.bus_id); |
156 | CIO_TRACE_EVENT(0, dbf_text); | |
157 | CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib)); | |
158 | ||
159 | return (sch->lpm ? -EACCES : -ENODEV); | |
160 | } | |
161 | ||
162 | int | |
163 | cio_start_key (struct subchannel *sch, /* subchannel structure */ | |
164 | struct ccw1 * cpa, /* logical channel prog addr */ | |
165 | __u8 lpm, /* logical path mask */ | |
166 | __u8 key) /* storage key */ | |
167 | { | |
168 | char dbf_txt[15]; | |
169 | int ccode; | |
cd6b4f27 | 170 | struct orb *orb; |
1da177e4 | 171 | |
cd6b4f27 CH |
172 | CIO_TRACE_EVENT(4, "stIO"); |
173 | CIO_TRACE_EVENT(4, sch->dev.bus_id); | |
1da177e4 | 174 | |
cd6b4f27 | 175 | orb = &to_io_private(sch)->orb; |
1da177e4 | 176 | /* sch is always under 2G. */ |
cd6b4f27 CH |
177 | orb->intparm = (u32)(addr_t)sch; |
178 | orb->fmt = 1; | |
1da177e4 | 179 | |
cd6b4f27 CH |
180 | orb->pfch = sch->options.prefetch == 0; |
181 | orb->spnd = sch->options.suspend; | |
182 | orb->ssic = sch->options.suspend && sch->options.inter; | |
183 | orb->lpm = (lpm != 0) ? lpm : sch->lpm; | |
347a8dc3 | 184 | #ifdef CONFIG_64BIT |
1da177e4 LT |
185 | /* |
186 | * for 64 bit we always support 64 bit IDAWs with 4k page size only | |
187 | */ | |
cd6b4f27 CH |
188 | orb->c64 = 1; |
189 | orb->i2k = 0; | |
1da177e4 | 190 | #endif |
cd6b4f27 | 191 | orb->key = key >> 4; |
1da177e4 | 192 | /* issue "Start Subchannel" */ |
cd6b4f27 CH |
193 | orb->cpa = (__u32) __pa(cpa); |
194 | ccode = ssch(sch->schid, orb); | |
1da177e4 LT |
195 | |
196 | /* process condition code */ | |
cd6b4f27 CH |
197 | sprintf(dbf_txt, "ccode:%d", ccode); |
198 | CIO_TRACE_EVENT(4, dbf_txt); | |
1da177e4 LT |
199 | |
200 | switch (ccode) { | |
201 | case 0: | |
202 | /* | |
203 | * initialize device status information | |
204 | */ | |
205 | sch->schib.scsw.actl |= SCSW_ACTL_START_PEND; | |
206 | return 0; | |
207 | case 1: /* status pending */ | |
208 | case 2: /* busy */ | |
209 | return -EBUSY; | |
210 | default: /* device/path not operational */ | |
211 | return cio_start_handle_notoper(sch, lpm); | |
212 | } | |
213 | } | |
214 | ||
215 | int | |
216 | cio_start (struct subchannel *sch, struct ccw1 *cpa, __u8 lpm) | |
217 | { | |
0b642ede | 218 | return cio_start_key(sch, cpa, lpm, PAGE_DEFAULT_KEY); |
1da177e4 LT |
219 | } |
220 | ||
221 | /* | |
222 | * resume suspended I/O operation | |
223 | */ | |
224 | int | |
225 | cio_resume (struct subchannel *sch) | |
226 | { | |
227 | char dbf_txt[15]; | |
228 | int ccode; | |
229 | ||
230 | CIO_TRACE_EVENT (4, "resIO"); | |
231 | CIO_TRACE_EVENT (4, sch->dev.bus_id); | |
232 | ||
a8237fc4 | 233 | ccode = rsch (sch->schid); |
1da177e4 LT |
234 | |
235 | sprintf (dbf_txt, "ccode:%d", ccode); | |
236 | CIO_TRACE_EVENT (4, dbf_txt); | |
237 | ||
238 | switch (ccode) { | |
239 | case 0: | |
240 | sch->schib.scsw.actl |= SCSW_ACTL_RESUME_PEND; | |
241 | return 0; | |
242 | case 1: | |
243 | return -EBUSY; | |
244 | case 2: | |
245 | return -EINVAL; | |
246 | default: | |
247 | /* | |
248 | * useless to wait for request completion | |
249 | * as device is no longer operational ! | |
250 | */ | |
251 | return -ENODEV; | |
252 | } | |
253 | } | |
254 | ||
255 | /* | |
256 | * halt I/O operation | |
257 | */ | |
258 | int | |
259 | cio_halt(struct subchannel *sch) | |
260 | { | |
261 | char dbf_txt[15]; | |
262 | int ccode; | |
263 | ||
264 | if (!sch) | |
265 | return -ENODEV; | |
266 | ||
267 | CIO_TRACE_EVENT (2, "haltIO"); | |
268 | CIO_TRACE_EVENT (2, sch->dev.bus_id); | |
269 | ||
270 | /* | |
271 | * Issue "Halt subchannel" and process condition code | |
272 | */ | |
a8237fc4 | 273 | ccode = hsch (sch->schid); |
1da177e4 LT |
274 | |
275 | sprintf (dbf_txt, "ccode:%d", ccode); | |
276 | CIO_TRACE_EVENT (2, dbf_txt); | |
277 | ||
278 | switch (ccode) { | |
279 | case 0: | |
280 | sch->schib.scsw.actl |= SCSW_ACTL_HALT_PEND; | |
281 | return 0; | |
282 | case 1: /* status pending */ | |
283 | case 2: /* busy */ | |
284 | return -EBUSY; | |
285 | default: /* device not operational */ | |
286 | return -ENODEV; | |
287 | } | |
288 | } | |
289 | ||
290 | /* | |
291 | * Clear I/O operation | |
292 | */ | |
293 | int | |
294 | cio_clear(struct subchannel *sch) | |
295 | { | |
296 | char dbf_txt[15]; | |
297 | int ccode; | |
298 | ||
299 | if (!sch) | |
300 | return -ENODEV; | |
301 | ||
302 | CIO_TRACE_EVENT (2, "clearIO"); | |
303 | CIO_TRACE_EVENT (2, sch->dev.bus_id); | |
304 | ||
305 | /* | |
306 | * Issue "Clear subchannel" and process condition code | |
307 | */ | |
a8237fc4 | 308 | ccode = csch (sch->schid); |
1da177e4 LT |
309 | |
310 | sprintf (dbf_txt, "ccode:%d", ccode); | |
311 | CIO_TRACE_EVENT (2, dbf_txt); | |
312 | ||
313 | switch (ccode) { | |
314 | case 0: | |
315 | sch->schib.scsw.actl |= SCSW_ACTL_CLEAR_PEND; | |
316 | return 0; | |
317 | default: /* device not operational */ | |
318 | return -ENODEV; | |
319 | } | |
320 | } | |
321 | ||
322 | /* | |
323 | * Function: cio_cancel | |
324 | * Issues a "Cancel Subchannel" on the specified subchannel | |
325 | * Note: We don't need any fancy intparms and flags here | |
326 | * since xsch is executed synchronously. | |
327 | * Only for common I/O internal use as for now. | |
328 | */ | |
329 | int | |
330 | cio_cancel (struct subchannel *sch) | |
331 | { | |
332 | char dbf_txt[15]; | |
333 | int ccode; | |
334 | ||
335 | if (!sch) | |
336 | return -ENODEV; | |
337 | ||
338 | CIO_TRACE_EVENT (2, "cancelIO"); | |
339 | CIO_TRACE_EVENT (2, sch->dev.bus_id); | |
340 | ||
a8237fc4 | 341 | ccode = xsch (sch->schid); |
1da177e4 LT |
342 | |
343 | sprintf (dbf_txt, "ccode:%d", ccode); | |
344 | CIO_TRACE_EVENT (2, dbf_txt); | |
345 | ||
346 | switch (ccode) { | |
347 | case 0: /* success */ | |
348 | /* Update information in scsw. */ | |
a8237fc4 | 349 | stsch (sch->schid, &sch->schib); |
1da177e4 LT |
350 | return 0; |
351 | case 1: /* status pending */ | |
352 | return -EBUSY; | |
353 | case 2: /* not applicable */ | |
354 | return -EINVAL; | |
355 | default: /* not oper */ | |
356 | return -ENODEV; | |
357 | } | |
358 | } | |
359 | ||
360 | /* | |
361 | * Function: cio_modify | |
362 | * Issues a "Modify Subchannel" on the specified subchannel | |
363 | */ | |
364 | int | |
365 | cio_modify (struct subchannel *sch) | |
366 | { | |
367 | int ccode, retry, ret; | |
368 | ||
369 | ret = 0; | |
370 | for (retry = 0; retry < 5; retry++) { | |
a8237fc4 | 371 | ccode = msch_err (sch->schid, &sch->schib); |
1da177e4 LT |
372 | if (ccode < 0) /* -EIO if msch gets a program check. */ |
373 | return ccode; | |
374 | switch (ccode) { | |
375 | case 0: /* successfull */ | |
376 | return 0; | |
377 | case 1: /* status pending */ | |
378 | return -EBUSY; | |
379 | case 2: /* busy */ | |
380 | udelay (100); /* allow for recovery */ | |
381 | ret = -EBUSY; | |
382 | break; | |
383 | case 3: /* not operational */ | |
384 | return -ENODEV; | |
385 | } | |
386 | } | |
387 | return ret; | |
388 | } | |
389 | ||
390 | /* | |
391 | * Enable subchannel. | |
392 | */ | |
edf22096 | 393 | int cio_enable_subchannel(struct subchannel *sch, u32 intparm) |
1da177e4 LT |
394 | { |
395 | char dbf_txt[15]; | |
396 | int ccode; | |
397 | int retry; | |
398 | int ret; | |
399 | ||
400 | CIO_TRACE_EVENT (2, "ensch"); | |
401 | CIO_TRACE_EVENT (2, sch->dev.bus_id); | |
402 | ||
d7b5a4c9 CH |
403 | if (sch_is_pseudo_sch(sch)) |
404 | return -EINVAL; | |
a8237fc4 | 405 | ccode = stsch (sch->schid, &sch->schib); |
1da177e4 LT |
406 | if (ccode) |
407 | return -ENODEV; | |
408 | ||
409 | for (retry = 5, ret = 0; retry > 0; retry--) { | |
410 | sch->schib.pmcw.ena = 1; | |
edf22096 | 411 | sch->schib.pmcw.isc = sch->isc; |
b279a4f5 | 412 | sch->schib.pmcw.intparm = intparm; |
1da177e4 LT |
413 | ret = cio_modify(sch); |
414 | if (ret == -ENODEV) | |
415 | break; | |
416 | if (ret == -EIO) | |
417 | /* | |
418 | * Got a program check in cio_modify. Try without | |
419 | * the concurrent sense bit the next time. | |
420 | */ | |
421 | sch->schib.pmcw.csense = 0; | |
422 | if (ret == 0) { | |
a8237fc4 | 423 | stsch (sch->schid, &sch->schib); |
1da177e4 LT |
424 | if (sch->schib.pmcw.ena) |
425 | break; | |
426 | } | |
427 | if (ret == -EBUSY) { | |
428 | struct irb irb; | |
a8237fc4 | 429 | if (tsch(sch->schid, &irb) != 0) |
1da177e4 LT |
430 | break; |
431 | } | |
432 | } | |
433 | sprintf (dbf_txt, "ret:%d", ret); | |
434 | CIO_TRACE_EVENT (2, dbf_txt); | |
435 | return ret; | |
436 | } | |
437 | ||
438 | /* | |
439 | * Disable subchannel. | |
440 | */ | |
441 | int | |
442 | cio_disable_subchannel (struct subchannel *sch) | |
443 | { | |
444 | char dbf_txt[15]; | |
445 | int ccode; | |
446 | int retry; | |
447 | int ret; | |
448 | ||
449 | CIO_TRACE_EVENT (2, "dissch"); | |
450 | CIO_TRACE_EVENT (2, sch->dev.bus_id); | |
451 | ||
d7b5a4c9 CH |
452 | if (sch_is_pseudo_sch(sch)) |
453 | return 0; | |
a8237fc4 | 454 | ccode = stsch (sch->schid, &sch->schib); |
1da177e4 LT |
455 | if (ccode == 3) /* Not operational. */ |
456 | return -ENODEV; | |
457 | ||
458 | if (sch->schib.scsw.actl != 0) | |
459 | /* | |
460 | * the disable function must not be called while there are | |
461 | * requests pending for completion ! | |
462 | */ | |
463 | return -EBUSY; | |
464 | ||
465 | for (retry = 5, ret = 0; retry > 0; retry--) { | |
466 | sch->schib.pmcw.ena = 0; | |
467 | ret = cio_modify(sch); | |
468 | if (ret == -ENODEV) | |
469 | break; | |
470 | if (ret == -EBUSY) | |
471 | /* | |
472 | * The subchannel is busy or status pending. | |
473 | * We'll disable when the next interrupt was delivered | |
474 | * via the state machine. | |
475 | */ | |
476 | break; | |
477 | if (ret == 0) { | |
a8237fc4 | 478 | stsch (sch->schid, &sch->schib); |
1da177e4 LT |
479 | if (!sch->schib.pmcw.ena) |
480 | break; | |
481 | } | |
482 | } | |
483 | sprintf (dbf_txt, "ret:%d", ret); | |
484 | CIO_TRACE_EVENT (2, dbf_txt); | |
485 | return ret; | |
486 | } | |
487 | ||
d7b5a4c9 | 488 | int cio_create_sch_lock(struct subchannel *sch) |
2ec22984 CH |
489 | { |
490 | sch->lock = kmalloc(sizeof(spinlock_t), GFP_KERNEL); | |
491 | if (!sch->lock) | |
492 | return -ENOMEM; | |
493 | spin_lock_init(sch->lock); | |
494 | return 0; | |
495 | } | |
496 | ||
0ae7a7b2 CH |
497 | static int cio_validate_io_subchannel(struct subchannel *sch) |
498 | { | |
499 | /* Initialization for io subchannels. */ | |
500 | if (!css_sch_is_valid(&sch->schib)) | |
501 | return -ENODEV; | |
502 | ||
503 | /* Devno is valid. */ | |
504 | if (is_blacklisted(sch->schid.ssid, sch->schib.pmcw.dev)) { | |
505 | /* | |
506 | * This device must not be known to Linux. So we simply | |
507 | * say that there is no device and return ENODEV. | |
508 | */ | |
509 | CIO_MSG_EVENT(6, "Blacklisted device detected " | |
510 | "at devno %04X, subchannel set %x\n", | |
511 | sch->schib.pmcw.dev, sch->schid.ssid); | |
512 | return -ENODEV; | |
513 | } | |
514 | return 0; | |
515 | } | |
516 | ||
517 | /** | |
518 | * cio_validate_subchannel - basic validation of subchannel | |
519 | * @sch: subchannel structure to be filled out | |
520 | * @schid: subchannel id | |
1da177e4 LT |
521 | * |
522 | * Find out subchannel type and initialize struct subchannel. | |
523 | * Return codes: | |
0ae7a7b2 | 524 | * 0 on success |
1da177e4 | 525 | * -ENXIO for non-defined subchannels |
0ae7a7b2 CH |
526 | * -ENODEV for invalid subchannels or blacklisted devices |
527 | * -EIO for subchannels in an invalid subchannel set | |
1da177e4 | 528 | */ |
0ae7a7b2 | 529 | int cio_validate_subchannel(struct subchannel *sch, struct subchannel_id schid) |
1da177e4 LT |
530 | { |
531 | char dbf_txt[15]; | |
532 | int ccode; | |
2ec22984 | 533 | int err; |
1da177e4 | 534 | |
0ae7a7b2 CH |
535 | sprintf(dbf_txt, "valsch%x", schid.sch_no); |
536 | CIO_TRACE_EVENT(4, dbf_txt); | |
1da177e4 LT |
537 | |
538 | /* Nuke all fields. */ | |
539 | memset(sch, 0, sizeof(struct subchannel)); | |
540 | ||
2ec22984 CH |
541 | sch->schid = schid; |
542 | if (cio_is_console(schid)) { | |
543 | sch->lock = cio_get_console_lock(); | |
544 | } else { | |
545 | err = cio_create_sch_lock(sch); | |
546 | if (err) | |
547 | goto out; | |
548 | } | |
6ab4879a | 549 | mutex_init(&sch->reg_mutex); |
1da177e4 | 550 | /* Set a name for the subchannel */ |
fb6958a5 CH |
551 | snprintf (sch->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x", schid.ssid, |
552 | schid.sch_no); | |
1da177e4 LT |
553 | |
554 | /* | |
555 | * The first subchannel that is not-operational (ccode==3) | |
556 | * indicates that there aren't any more devices available. | |
fb6958a5 CH |
557 | * If stsch gets an exception, it means the current subchannel set |
558 | * is not valid. | |
1da177e4 | 559 | */ |
fb6958a5 | 560 | ccode = stsch_err (schid, &sch->schib); |
2ec22984 CH |
561 | if (ccode) { |
562 | err = (ccode == 3) ? -ENXIO : ccode; | |
563 | goto out; | |
564 | } | |
1da177e4 LT |
565 | /* Copy subchannel type from path management control word. */ |
566 | sch->st = sch->schib.pmcw.st; | |
0ae7a7b2 CH |
567 | switch (sch->st) { |
568 | case SUBCHANNEL_TYPE_IO: | |
569 | err = cio_validate_io_subchannel(sch); | |
570 | break; | |
571 | default: | |
572 | err = 0; | |
1da177e4 | 573 | } |
0ae7a7b2 | 574 | if (err) |
808e4888 | 575 | goto out; |
808e4888 | 576 | |
0ae7a7b2 CH |
577 | CIO_MSG_EVENT(4, "Subchannel 0.%x.%04x reports subchannel type %04X\n", |
578 | sch->schid.ssid, sch->schid.sch_no, sch->st); | |
1da177e4 | 579 | return 0; |
2ec22984 CH |
580 | out: |
581 | if (!cio_is_console(schid)) | |
582 | kfree(sch->lock); | |
583 | sch->lock = NULL; | |
584 | return err; | |
1da177e4 LT |
585 | } |
586 | ||
587 | /* | |
588 | * do_IRQ() handles all normal I/O device IRQ's (the special | |
589 | * SMP cross-CPU interrupts have their own specific | |
590 | * handlers). | |
591 | * | |
592 | */ | |
593 | void | |
594 | do_IRQ (struct pt_regs *regs) | |
595 | { | |
596 | struct tpi_info *tpi_info; | |
597 | struct subchannel *sch; | |
598 | struct irb *irb; | |
5a489b98 | 599 | struct pt_regs *old_regs; |
1da177e4 | 600 | |
5a489b98 | 601 | old_regs = set_irq_regs(regs); |
9d0a57cb | 602 | irq_enter(); |
43ca5c3a | 603 | s390_idle_check(); |
5a62b192 HC |
604 | if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator) |
605 | /* Serve timer interrupts first. */ | |
606 | clock_comparator_work(); | |
1da177e4 LT |
607 | /* |
608 | * Get interrupt information from lowcore | |
609 | */ | |
610 | tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID; | |
611 | irb = (struct irb *) __LC_IRB; | |
612 | do { | |
613 | kstat_cpu(smp_processor_id()).irqs[IO_INTERRUPT]++; | |
614 | /* | |
615 | * Non I/O-subchannel thin interrupts are processed differently | |
616 | */ | |
617 | if (tpi_info->adapter_IO == 1 && | |
618 | tpi_info->int_type == IO_INTERRUPT_TYPE) { | |
619 | do_adapter_IO(); | |
620 | continue; | |
621 | } | |
622 | sch = (struct subchannel *)(unsigned long)tpi_info->intparm; | |
a806170e HC |
623 | if (!sch) { |
624 | /* Clear pending interrupt condition. */ | |
625 | tsch(tpi_info->schid, irb); | |
626 | continue; | |
627 | } | |
628 | spin_lock(sch->lock); | |
1da177e4 | 629 | /* Store interrupt response block to lowcore. */ |
a806170e | 630 | if (tsch(tpi_info->schid, irb) == 0) { |
1da177e4 LT |
631 | /* Keep subchannel information word up to date. */ |
632 | memcpy (&sch->schib.scsw, &irb->scsw, | |
633 | sizeof (irb->scsw)); | |
634 | /* Call interrupt handler if there is one. */ | |
635 | if (sch->driver && sch->driver->irq) | |
602b20f2 | 636 | sch->driver->irq(sch); |
1da177e4 | 637 | } |
a806170e | 638 | spin_unlock(sch->lock); |
1da177e4 LT |
639 | /* |
640 | * Are more interrupts pending? | |
641 | * If so, the tpi instruction will update the lowcore | |
642 | * to hold the info for the next interrupt. | |
643 | * We don't do this for VM because a tpi drops the cpu | |
644 | * out of the sie which costs more cycles than it saves. | |
645 | */ | |
646 | } while (!MACHINE_IS_VM && tpi (NULL) != 0); | |
9d0a57cb | 647 | irq_exit(); |
5a489b98 | 648 | set_irq_regs(old_regs); |
1da177e4 LT |
649 | } |
650 | ||
651 | #ifdef CONFIG_CCW_CONSOLE | |
652 | static struct subchannel console_subchannel; | |
cd6b4f27 | 653 | static struct io_subchannel_private console_priv; |
1da177e4 LT |
654 | static int console_subchannel_in_use; |
655 | ||
cd6b4f27 CH |
656 | void *cio_get_console_priv(void) |
657 | { | |
658 | return &console_priv; | |
659 | } | |
660 | ||
1da177e4 LT |
661 | /* |
662 | * busy wait for the next interrupt on the console | |
663 | */ | |
a806170e HC |
664 | void wait_cons_dev(void) |
665 | __releases(console_subchannel.lock) | |
666 | __acquires(console_subchannel.lock) | |
1da177e4 LT |
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 | ||
85b0d7c0 | 678 | /* disable all but isc 1 (console device) */ |
1da177e4 | 679 | __ctl_store (save_cr6, 6, 6); |
85b0d7c0 | 680 | cr6 = 0x40000000; |
1da177e4 LT |
681 | __ctl_load (cr6, 6, 6); |
682 | ||
683 | do { | |
2ec22984 | 684 | spin_unlock(console_subchannel.lock); |
1da177e4 LT |
685 | if (!cio_tpi()) |
686 | cpu_relax(); | |
2ec22984 | 687 | spin_lock(console_subchannel.lock); |
1da177e4 LT |
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 | 699 | return -ENXIO; |
b279a4f5 CH |
700 | if ((console_subchannel.schib.pmcw.st == SUBCHANNEL_TYPE_IO) && |
701 | console_subchannel.schib.pmcw.dnv && | |
702 | (console_subchannel.schib.pmcw.dev == console_devno)) { | |
f97a56fb CH |
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 || | |
b279a4f5 | 720 | (console_subchannel.schib.pmcw.st != SUBCHANNEL_TYPE_IO) || |
1da177e4 LT |
721 | !console_subchannel.schib.pmcw.dnv) |
722 | return -1; | |
723 | console_devno = console_subchannel.schib.pmcw.dev; | |
724 | } else if (console_devno != -1) { | |
725 | /* At least the console device number is known. */ | |
f97a56fb | 726 | for_each_subchannel(cio_test_for_console, NULL); |
1da177e4 LT |
727 | if (console_irq == -1) |
728 | return -1; | |
729 | } else { | |
730 | /* unlike in 2.4, we cannot autoprobe here, since | |
731 | * the channel subsystem is not fully initialized. | |
732 | * With some luck, the HWC console can take over */ | |
e556bbbd | 733 | printk(KERN_WARNING "cio: No ccw console found!\n"); |
1da177e4 LT |
734 | return -1; |
735 | } | |
736 | return console_irq; | |
737 | } | |
738 | ||
739 | struct subchannel * | |
740 | cio_probe_console(void) | |
741 | { | |
f97a56fb | 742 | int sch_no, ret; |
a8237fc4 | 743 | struct subchannel_id schid; |
1da177e4 LT |
744 | |
745 | if (xchg(&console_subchannel_in_use, 1) != 0) | |
746 | return ERR_PTR(-EBUSY); | |
f97a56fb CH |
747 | sch_no = cio_get_console_sch_no(); |
748 | if (sch_no == -1) { | |
1da177e4 LT |
749 | console_subchannel_in_use = 0; |
750 | return ERR_PTR(-ENODEV); | |
751 | } | |
752 | memset(&console_subchannel, 0, sizeof(struct subchannel)); | |
a8237fc4 | 753 | init_subchannel_id(&schid); |
f97a56fb | 754 | schid.sch_no = sch_no; |
a8237fc4 | 755 | ret = cio_validate_subchannel(&console_subchannel, schid); |
1da177e4 LT |
756 | if (ret) { |
757 | console_subchannel_in_use = 0; | |
758 | return ERR_PTR(-ENODEV); | |
759 | } | |
760 | ||
761 | /* | |
85b0d7c0 | 762 | * enable console I/O-interrupt subclass 1 |
1da177e4 | 763 | */ |
85b0d7c0 | 764 | ctl_set_bit(6, 30); |
85b0d7c0 | 765 | console_subchannel.schib.pmcw.isc = 1; |
1da177e4 | 766 | console_subchannel.schib.pmcw.intparm = |
cd6b4f27 | 767 | (u32)(addr_t)&console_subchannel; |
1da177e4 LT |
768 | ret = cio_modify(&console_subchannel); |
769 | if (ret) { | |
770 | console_subchannel_in_use = 0; | |
771 | return ERR_PTR(ret); | |
772 | } | |
773 | return &console_subchannel; | |
774 | } | |
775 | ||
776 | void | |
777 | cio_release_console(void) | |
778 | { | |
779 | console_subchannel.schib.pmcw.intparm = 0; | |
780 | cio_modify(&console_subchannel); | |
9689b336 | 781 | ctl_clear_bit(6, 30); |
1da177e4 LT |
782 | console_subchannel_in_use = 0; |
783 | } | |
784 | ||
785 | /* Bah... hack to catch console special sausages. */ | |
786 | int | |
a8237fc4 | 787 | cio_is_console(struct subchannel_id schid) |
1da177e4 LT |
788 | { |
789 | if (!console_subchannel_in_use) | |
790 | return 0; | |
a8237fc4 | 791 | return schid_equal(&schid, &console_subchannel.schid); |
1da177e4 LT |
792 | } |
793 | ||
794 | struct subchannel * | |
795 | cio_get_console_subchannel(void) | |
796 | { | |
797 | if (!console_subchannel_in_use) | |
d2c993d8 | 798 | return NULL; |
1da177e4 LT |
799 | return &console_subchannel; |
800 | } | |
801 | ||
802 | #endif | |
4d284cac | 803 | static int |
a8237fc4 | 804 | __disable_subchannel_easy(struct subchannel_id schid, struct schib *schib) |
1da177e4 LT |
805 | { |
806 | int retry, cc; | |
807 | ||
808 | cc = 0; | |
809 | for (retry=0;retry<3;retry++) { | |
810 | schib->pmcw.ena = 0; | |
811 | cc = msch(schid, schib); | |
812 | if (cc) | |
813 | return (cc==3?-ENODEV:-EBUSY); | |
814 | stsch(schid, schib); | |
815 | if (!schib->pmcw.ena) | |
816 | return 0; | |
817 | } | |
818 | return -EBUSY; /* uhm... */ | |
819 | } | |
820 | ||
d54853ef MS |
821 | /* we can't use the normal udelay here, since it enables external interrupts */ |
822 | ||
823 | static void udelay_reset(unsigned long usecs) | |
824 | { | |
825 | uint64_t start_cc, end_cc; | |
826 | ||
827 | asm volatile ("STCK %0" : "=m" (start_cc)); | |
828 | do { | |
829 | cpu_relax(); | |
830 | asm volatile ("STCK %0" : "=m" (end_cc)); | |
831 | } while (((end_cc - start_cc)/4096) < usecs); | |
832 | } | |
833 | ||
4d284cac | 834 | static int |
0ae7a7b2 | 835 | __clear_io_subchannel_easy(struct subchannel_id schid) |
1da177e4 LT |
836 | { |
837 | int retry; | |
838 | ||
839 | if (csch(schid)) | |
840 | return -ENODEV; | |
841 | for (retry=0;retry<20;retry++) { | |
842 | struct tpi_info ti; | |
843 | ||
844 | if (tpi(&ti)) { | |
a8237fc4 CH |
845 | tsch(ti.schid, (struct irb *)__LC_IRB); |
846 | if (schid_equal(&ti.schid, &schid)) | |
4c24da79 | 847 | return 0; |
1da177e4 | 848 | } |
d54853ef | 849 | udelay_reset(100); |
1da177e4 LT |
850 | } |
851 | return -EBUSY; | |
852 | } | |
853 | ||
a45e1414 MH |
854 | static int pgm_check_occured; |
855 | ||
856 | static void cio_reset_pgm_check_handler(void) | |
857 | { | |
858 | pgm_check_occured = 1; | |
859 | } | |
860 | ||
861 | static int stsch_reset(struct subchannel_id schid, volatile struct schib *addr) | |
862 | { | |
863 | int rc; | |
864 | ||
865 | pgm_check_occured = 0; | |
ab14de6c | 866 | s390_base_pgm_handler_fn = cio_reset_pgm_check_handler; |
6faf4444 | 867 | rc = stsch(schid, addr); |
ab14de6c | 868 | s390_base_pgm_handler_fn = NULL; |
aa77015c | 869 | |
ab14de6c | 870 | /* The program check handler could have changed pgm_check_occured. */ |
6faf4444 | 871 | barrier(); |
aa77015c | 872 | |
a45e1414 MH |
873 | if (pgm_check_occured) |
874 | return -EIO; | |
875 | else | |
876 | return rc; | |
877 | } | |
878 | ||
15e9b586 | 879 | static int __shutdown_subchannel_easy(struct subchannel_id schid, void *data) |
f97a56fb CH |
880 | { |
881 | struct schib schib; | |
882 | ||
a45e1414 | 883 | if (stsch_reset(schid, &schib)) |
f97a56fb CH |
884 | return -ENXIO; |
885 | if (!schib.pmcw.ena) | |
886 | return 0; | |
887 | switch(__disable_subchannel_easy(schid, &schib)) { | |
888 | case 0: | |
889 | case -ENODEV: | |
890 | break; | |
891 | default: /* -EBUSY */ | |
0ae7a7b2 CH |
892 | switch (schib.pmcw.st) { |
893 | case SUBCHANNEL_TYPE_IO: | |
894 | if (__clear_io_subchannel_easy(schid)) | |
895 | goto out; /* give up... */ | |
896 | break; | |
897 | default: | |
898 | /* No default clear strategy */ | |
899 | break; | |
900 | } | |
f97a56fb CH |
901 | stsch(schid, &schib); |
902 | __disable_subchannel_easy(schid, &schib); | |
903 | } | |
0ae7a7b2 | 904 | out: |
f97a56fb CH |
905 | return 0; |
906 | } | |
1da177e4 | 907 | |
15e9b586 HC |
908 | static atomic_t chpid_reset_count; |
909 | ||
910 | static void s390_reset_chpids_mcck_handler(void) | |
911 | { | |
912 | struct crw crw; | |
913 | struct mci *mci; | |
914 | ||
915 | /* Check for pending channel report word. */ | |
916 | mci = (struct mci *)&S390_lowcore.mcck_interruption_code; | |
917 | if (!mci->cp) | |
918 | return; | |
919 | /* Process channel report words. */ | |
920 | while (stcrw(&crw) == 0) { | |
921 | /* Check for responses to RCHP. */ | |
922 | if (crw.slct && crw.rsc == CRW_RSC_CPATH) | |
923 | atomic_dec(&chpid_reset_count); | |
924 | } | |
925 | } | |
926 | ||
927 | #define RCHP_TIMEOUT (30 * USEC_PER_SEC) | |
928 | static void css_reset(void) | |
929 | { | |
930 | int i, ret; | |
931 | unsigned long long timeout; | |
f86635fa | 932 | struct chp_id chpid; |
15e9b586 HC |
933 | |
934 | /* Reset subchannels. */ | |
935 | for_each_subchannel(__shutdown_subchannel_easy, NULL); | |
936 | /* Reset channel paths. */ | |
ab14de6c | 937 | s390_base_mcck_handler_fn = s390_reset_chpids_mcck_handler; |
15e9b586 HC |
938 | /* Enable channel report machine checks. */ |
939 | __ctl_set_bit(14, 28); | |
940 | /* Temporarily reenable machine checks. */ | |
941 | local_mcck_enable(); | |
f86635fa | 942 | chp_id_init(&chpid); |
15e9b586 | 943 | for (i = 0; i <= __MAX_CHPID; i++) { |
f86635fa PO |
944 | chpid.id = i; |
945 | ret = rchp(chpid); | |
15e9b586 HC |
946 | if ((ret == 0) || (ret == 2)) |
947 | /* | |
948 | * rchp either succeeded, or another rchp is already | |
949 | * in progress. In either case, we'll get a crw. | |
950 | */ | |
951 | atomic_inc(&chpid_reset_count); | |
952 | } | |
953 | /* Wait for machine check for all channel paths. */ | |
954 | timeout = get_clock() + (RCHP_TIMEOUT << 12); | |
955 | while (atomic_read(&chpid_reset_count) != 0) { | |
956 | if (get_clock() > timeout) | |
957 | break; | |
958 | cpu_relax(); | |
959 | } | |
960 | /* Disable machine checks again. */ | |
961 | local_mcck_disable(); | |
962 | /* Disable channel report machine checks. */ | |
963 | __ctl_clear_bit(14, 28); | |
ab14de6c | 964 | s390_base_mcck_handler_fn = NULL; |
15e9b586 HC |
965 | } |
966 | ||
967 | static struct reset_call css_reset_call = { | |
968 | .fn = css_reset, | |
969 | }; | |
970 | ||
971 | static int __init init_css_reset_call(void) | |
972 | { | |
973 | atomic_set(&chpid_reset_count, 0); | |
974 | register_reset_call(&css_reset_call); | |
975 | return 0; | |
976 | } | |
977 | ||
978 | arch_initcall(init_css_reset_call); | |
979 | ||
980 | struct sch_match_id { | |
981 | struct subchannel_id schid; | |
982 | struct ccw_dev_id devid; | |
983 | int rc; | |
984 | }; | |
985 | ||
986 | static int __reipl_subchannel_match(struct subchannel_id schid, void *data) | |
987 | { | |
988 | struct schib schib; | |
989 | struct sch_match_id *match_id = data; | |
990 | ||
a45e1414 | 991 | if (stsch_reset(schid, &schib)) |
15e9b586 | 992 | return -ENXIO; |
b279a4f5 | 993 | if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv && |
15e9b586 HC |
994 | (schib.pmcw.dev == match_id->devid.devno) && |
995 | (schid.ssid == match_id->devid.ssid)) { | |
996 | match_id->schid = schid; | |
997 | match_id->rc = 0; | |
998 | return 1; | |
999 | } | |
1000 | return 0; | |
1001 | } | |
1002 | ||
1003 | static int reipl_find_schid(struct ccw_dev_id *devid, | |
1004 | struct subchannel_id *schid) | |
1da177e4 | 1005 | { |
ff6b8ea6 MH |
1006 | struct sch_match_id match_id; |
1007 | ||
1008 | match_id.devid = *devid; | |
1009 | match_id.rc = -ENODEV; | |
15e9b586 | 1010 | for_each_subchannel(__reipl_subchannel_match, &match_id); |
ff6b8ea6 MH |
1011 | if (match_id.rc == 0) |
1012 | *schid = match_id.schid; | |
1013 | return match_id.rc; | |
1da177e4 LT |
1014 | } |
1015 | ||
ff6b8ea6 MH |
1016 | extern void do_reipl_asm(__u32 schid); |
1017 | ||
1da177e4 | 1018 | /* Make sure all subchannels are quiet before we re-ipl an lpar. */ |
ff6b8ea6 | 1019 | void reipl_ccw_dev(struct ccw_dev_id *devid) |
1da177e4 | 1020 | { |
ff6b8ea6 MH |
1021 | struct subchannel_id schid; |
1022 | ||
15e9b586 HC |
1023 | s390_reset_system(); |
1024 | if (reipl_find_schid(devid, &schid) != 0) | |
ff6b8ea6 | 1025 | panic("IPL Device not found\n"); |
ff6b8ea6 | 1026 | do_reipl_asm(*((__u32*)&schid)); |
1da177e4 | 1027 | } |
e87bfe51 | 1028 | |
6fc321fd | 1029 | int __init cio_get_iplinfo(struct cio_iplinfo *iplinfo) |
e87bfe51 HC |
1030 | { |
1031 | struct subchannel_id schid; | |
6fc321fd | 1032 | struct schib schib; |
e87bfe51 HC |
1033 | |
1034 | schid = *(struct subchannel_id *)__LC_SUBCHANNEL_ID; | |
1035 | if (!schid.one) | |
6fc321fd HC |
1036 | return -ENODEV; |
1037 | if (stsch(schid, &schib)) | |
1038 | return -ENODEV; | |
b279a4f5 CH |
1039 | if (schib.pmcw.st != SUBCHANNEL_TYPE_IO) |
1040 | return -ENODEV; | |
6fc321fd HC |
1041 | if (!schib.pmcw.dnv) |
1042 | return -ENODEV; | |
1043 | iplinfo->devno = schib.pmcw.dev; | |
1044 | iplinfo->is_qdio = schib.pmcw.qf; | |
1045 | return 0; | |
e87bfe51 | 1046 | } |