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 | ||
44a1c19e CH |
390 | /** |
391 | * cio_enable_subchannel - enable a subchannel. | |
392 | * @sch: subchannel to be enabled | |
393 | * @intparm: interruption parameter to set | |
1da177e4 | 394 | */ |
edf22096 | 395 | int cio_enable_subchannel(struct subchannel *sch, u32 intparm) |
1da177e4 LT |
396 | { |
397 | char dbf_txt[15]; | |
398 | int ccode; | |
399 | int retry; | |
400 | int ret; | |
401 | ||
402 | CIO_TRACE_EVENT (2, "ensch"); | |
403 | CIO_TRACE_EVENT (2, sch->dev.bus_id); | |
404 | ||
d7b5a4c9 CH |
405 | if (sch_is_pseudo_sch(sch)) |
406 | return -EINVAL; | |
a8237fc4 | 407 | ccode = stsch (sch->schid, &sch->schib); |
1da177e4 LT |
408 | if (ccode) |
409 | return -ENODEV; | |
410 | ||
411 | for (retry = 5, ret = 0; retry > 0; retry--) { | |
412 | sch->schib.pmcw.ena = 1; | |
edf22096 | 413 | sch->schib.pmcw.isc = sch->isc; |
b279a4f5 | 414 | sch->schib.pmcw.intparm = intparm; |
1da177e4 LT |
415 | ret = cio_modify(sch); |
416 | if (ret == -ENODEV) | |
417 | break; | |
418 | if (ret == -EIO) | |
419 | /* | |
420 | * Got a program check in cio_modify. Try without | |
421 | * the concurrent sense bit the next time. | |
422 | */ | |
423 | sch->schib.pmcw.csense = 0; | |
424 | if (ret == 0) { | |
a8237fc4 | 425 | stsch (sch->schid, &sch->schib); |
1da177e4 LT |
426 | if (sch->schib.pmcw.ena) |
427 | break; | |
428 | } | |
429 | if (ret == -EBUSY) { | |
430 | struct irb irb; | |
a8237fc4 | 431 | if (tsch(sch->schid, &irb) != 0) |
1da177e4 LT |
432 | break; |
433 | } | |
434 | } | |
435 | sprintf (dbf_txt, "ret:%d", ret); | |
436 | CIO_TRACE_EVENT (2, dbf_txt); | |
437 | return ret; | |
438 | } | |
44a1c19e | 439 | EXPORT_SYMBOL_GPL(cio_enable_subchannel); |
1da177e4 | 440 | |
44a1c19e CH |
441 | /** |
442 | * cio_disable_subchannel - disable a subchannel. | |
443 | * @sch: subchannel to disable | |
1da177e4 | 444 | */ |
44a1c19e | 445 | int cio_disable_subchannel(struct subchannel *sch) |
1da177e4 LT |
446 | { |
447 | char dbf_txt[15]; | |
448 | int ccode; | |
449 | int retry; | |
450 | int ret; | |
451 | ||
452 | CIO_TRACE_EVENT (2, "dissch"); | |
453 | CIO_TRACE_EVENT (2, sch->dev.bus_id); | |
454 | ||
d7b5a4c9 CH |
455 | if (sch_is_pseudo_sch(sch)) |
456 | return 0; | |
a8237fc4 | 457 | ccode = stsch (sch->schid, &sch->schib); |
1da177e4 LT |
458 | if (ccode == 3) /* Not operational. */ |
459 | return -ENODEV; | |
460 | ||
461 | if (sch->schib.scsw.actl != 0) | |
462 | /* | |
463 | * the disable function must not be called while there are | |
464 | * requests pending for completion ! | |
465 | */ | |
466 | return -EBUSY; | |
467 | ||
468 | for (retry = 5, ret = 0; retry > 0; retry--) { | |
469 | sch->schib.pmcw.ena = 0; | |
470 | ret = cio_modify(sch); | |
471 | if (ret == -ENODEV) | |
472 | break; | |
473 | if (ret == -EBUSY) | |
474 | /* | |
475 | * The subchannel is busy or status pending. | |
476 | * We'll disable when the next interrupt was delivered | |
477 | * via the state machine. | |
478 | */ | |
479 | break; | |
480 | if (ret == 0) { | |
a8237fc4 | 481 | stsch (sch->schid, &sch->schib); |
1da177e4 LT |
482 | if (!sch->schib.pmcw.ena) |
483 | break; | |
484 | } | |
485 | } | |
486 | sprintf (dbf_txt, "ret:%d", ret); | |
487 | CIO_TRACE_EVENT (2, dbf_txt); | |
488 | return ret; | |
489 | } | |
44a1c19e | 490 | EXPORT_SYMBOL_GPL(cio_disable_subchannel); |
1da177e4 | 491 | |
d7b5a4c9 | 492 | int cio_create_sch_lock(struct subchannel *sch) |
2ec22984 CH |
493 | { |
494 | sch->lock = kmalloc(sizeof(spinlock_t), GFP_KERNEL); | |
495 | if (!sch->lock) | |
496 | return -ENOMEM; | |
497 | spin_lock_init(sch->lock); | |
498 | return 0; | |
499 | } | |
500 | ||
0ae7a7b2 CH |
501 | static int cio_validate_io_subchannel(struct subchannel *sch) |
502 | { | |
503 | /* Initialization for io subchannels. */ | |
504 | if (!css_sch_is_valid(&sch->schib)) | |
505 | return -ENODEV; | |
506 | ||
507 | /* Devno is valid. */ | |
508 | if (is_blacklisted(sch->schid.ssid, sch->schib.pmcw.dev)) { | |
509 | /* | |
510 | * This device must not be known to Linux. So we simply | |
511 | * say that there is no device and return ENODEV. | |
512 | */ | |
513 | CIO_MSG_EVENT(6, "Blacklisted device detected " | |
514 | "at devno %04X, subchannel set %x\n", | |
515 | sch->schib.pmcw.dev, sch->schid.ssid); | |
516 | return -ENODEV; | |
517 | } | |
518 | return 0; | |
519 | } | |
520 | ||
521 | /** | |
522 | * cio_validate_subchannel - basic validation of subchannel | |
523 | * @sch: subchannel structure to be filled out | |
524 | * @schid: subchannel id | |
1da177e4 LT |
525 | * |
526 | * Find out subchannel type and initialize struct subchannel. | |
527 | * Return codes: | |
0ae7a7b2 | 528 | * 0 on success |
1da177e4 | 529 | * -ENXIO for non-defined subchannels |
0ae7a7b2 CH |
530 | * -ENODEV for invalid subchannels or blacklisted devices |
531 | * -EIO for subchannels in an invalid subchannel set | |
1da177e4 | 532 | */ |
0ae7a7b2 | 533 | int cio_validate_subchannel(struct subchannel *sch, struct subchannel_id schid) |
1da177e4 LT |
534 | { |
535 | char dbf_txt[15]; | |
536 | int ccode; | |
2ec22984 | 537 | int err; |
1da177e4 | 538 | |
0ae7a7b2 CH |
539 | sprintf(dbf_txt, "valsch%x", schid.sch_no); |
540 | CIO_TRACE_EVENT(4, dbf_txt); | |
1da177e4 LT |
541 | |
542 | /* Nuke all fields. */ | |
543 | memset(sch, 0, sizeof(struct subchannel)); | |
544 | ||
2ec22984 CH |
545 | sch->schid = schid; |
546 | if (cio_is_console(schid)) { | |
547 | sch->lock = cio_get_console_lock(); | |
548 | } else { | |
549 | err = cio_create_sch_lock(sch); | |
550 | if (err) | |
551 | goto out; | |
552 | } | |
6ab4879a | 553 | mutex_init(&sch->reg_mutex); |
1da177e4 | 554 | /* Set a name for the subchannel */ |
fb6958a5 CH |
555 | snprintf (sch->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x", schid.ssid, |
556 | schid.sch_no); | |
1da177e4 LT |
557 | |
558 | /* | |
559 | * The first subchannel that is not-operational (ccode==3) | |
560 | * indicates that there aren't any more devices available. | |
fb6958a5 CH |
561 | * If stsch gets an exception, it means the current subchannel set |
562 | * is not valid. | |
1da177e4 | 563 | */ |
fb6958a5 | 564 | ccode = stsch_err (schid, &sch->schib); |
2ec22984 CH |
565 | if (ccode) { |
566 | err = (ccode == 3) ? -ENXIO : ccode; | |
567 | goto out; | |
568 | } | |
1da177e4 LT |
569 | /* Copy subchannel type from path management control word. */ |
570 | sch->st = sch->schib.pmcw.st; | |
c820de39 | 571 | |
0ae7a7b2 CH |
572 | switch (sch->st) { |
573 | case SUBCHANNEL_TYPE_IO: | |
574 | err = cio_validate_io_subchannel(sch); | |
575 | break; | |
576 | default: | |
577 | err = 0; | |
1da177e4 | 578 | } |
0ae7a7b2 | 579 | if (err) |
808e4888 | 580 | goto out; |
808e4888 | 581 | |
0ae7a7b2 CH |
582 | CIO_MSG_EVENT(4, "Subchannel 0.%x.%04x reports subchannel type %04X\n", |
583 | sch->schid.ssid, sch->schid.sch_no, sch->st); | |
1da177e4 | 584 | return 0; |
2ec22984 CH |
585 | out: |
586 | if (!cio_is_console(schid)) | |
587 | kfree(sch->lock); | |
588 | sch->lock = NULL; | |
589 | return err; | |
1da177e4 LT |
590 | } |
591 | ||
592 | /* | |
593 | * do_IRQ() handles all normal I/O device IRQ's (the special | |
594 | * SMP cross-CPU interrupts have their own specific | |
595 | * handlers). | |
596 | * | |
597 | */ | |
598 | void | |
599 | do_IRQ (struct pt_regs *regs) | |
600 | { | |
601 | struct tpi_info *tpi_info; | |
602 | struct subchannel *sch; | |
603 | struct irb *irb; | |
5a489b98 | 604 | struct pt_regs *old_regs; |
1da177e4 | 605 | |
5a489b98 | 606 | old_regs = set_irq_regs(regs); |
9d0a57cb | 607 | irq_enter(); |
43ca5c3a | 608 | s390_idle_check(); |
5a62b192 HC |
609 | if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator) |
610 | /* Serve timer interrupts first. */ | |
611 | clock_comparator_work(); | |
1da177e4 LT |
612 | /* |
613 | * Get interrupt information from lowcore | |
614 | */ | |
615 | tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID; | |
616 | irb = (struct irb *) __LC_IRB; | |
617 | do { | |
618 | kstat_cpu(smp_processor_id()).irqs[IO_INTERRUPT]++; | |
619 | /* | |
620 | * Non I/O-subchannel thin interrupts are processed differently | |
621 | */ | |
622 | if (tpi_info->adapter_IO == 1 && | |
623 | tpi_info->int_type == IO_INTERRUPT_TYPE) { | |
624 | do_adapter_IO(); | |
625 | continue; | |
626 | } | |
627 | sch = (struct subchannel *)(unsigned long)tpi_info->intparm; | |
a806170e HC |
628 | if (!sch) { |
629 | /* Clear pending interrupt condition. */ | |
630 | tsch(tpi_info->schid, irb); | |
631 | continue; | |
632 | } | |
633 | spin_lock(sch->lock); | |
1da177e4 | 634 | /* Store interrupt response block to lowcore. */ |
a806170e | 635 | if (tsch(tpi_info->schid, irb) == 0) { |
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) | |
602b20f2 | 641 | sch->driver->irq(sch); |
1da177e4 | 642 | } |
a806170e | 643 | spin_unlock(sch->lock); |
1da177e4 LT |
644 | /* |
645 | * Are more interrupts pending? | |
646 | * If so, the tpi instruction will update the lowcore | |
647 | * to hold the info for the next interrupt. | |
648 | * We don't do this for VM because a tpi drops the cpu | |
649 | * out of the sie which costs more cycles than it saves. | |
650 | */ | |
651 | } while (!MACHINE_IS_VM && tpi (NULL) != 0); | |
9d0a57cb | 652 | irq_exit(); |
5a489b98 | 653 | set_irq_regs(old_regs); |
1da177e4 LT |
654 | } |
655 | ||
656 | #ifdef CONFIG_CCW_CONSOLE | |
657 | static struct subchannel console_subchannel; | |
cd6b4f27 | 658 | static struct io_subchannel_private console_priv; |
1da177e4 LT |
659 | static int console_subchannel_in_use; |
660 | ||
cd6b4f27 CH |
661 | void *cio_get_console_priv(void) |
662 | { | |
663 | return &console_priv; | |
664 | } | |
665 | ||
1da177e4 LT |
666 | /* |
667 | * busy wait for the next interrupt on the console | |
668 | */ | |
a806170e HC |
669 | void wait_cons_dev(void) |
670 | __releases(console_subchannel.lock) | |
671 | __acquires(console_subchannel.lock) | |
1da177e4 LT |
672 | { |
673 | unsigned long cr6 __attribute__ ((aligned (8))); | |
674 | unsigned long save_cr6 __attribute__ ((aligned (8))); | |
675 | ||
676 | /* | |
677 | * before entering the spinlock we may already have | |
678 | * processed the interrupt on a different CPU... | |
679 | */ | |
680 | if (!console_subchannel_in_use) | |
681 | return; | |
682 | ||
85b0d7c0 | 683 | /* disable all but isc 1 (console device) */ |
1da177e4 | 684 | __ctl_store (save_cr6, 6, 6); |
85b0d7c0 | 685 | cr6 = 0x40000000; |
1da177e4 LT |
686 | __ctl_load (cr6, 6, 6); |
687 | ||
688 | do { | |
2ec22984 | 689 | spin_unlock(console_subchannel.lock); |
1da177e4 LT |
690 | if (!cio_tpi()) |
691 | cpu_relax(); | |
2ec22984 | 692 | spin_lock(console_subchannel.lock); |
1da177e4 LT |
693 | } while (console_subchannel.schib.scsw.actl != 0); |
694 | /* | |
695 | * restore previous isc value | |
696 | */ | |
697 | __ctl_load (save_cr6, 6, 6); | |
698 | } | |
699 | ||
700 | static int | |
f97a56fb CH |
701 | cio_test_for_console(struct subchannel_id schid, void *data) |
702 | { | |
fb6958a5 | 703 | if (stsch_err(schid, &console_subchannel.schib) != 0) |
f97a56fb | 704 | return -ENXIO; |
b279a4f5 CH |
705 | if ((console_subchannel.schib.pmcw.st == SUBCHANNEL_TYPE_IO) && |
706 | console_subchannel.schib.pmcw.dnv && | |
707 | (console_subchannel.schib.pmcw.dev == console_devno)) { | |
f97a56fb CH |
708 | console_irq = schid.sch_no; |
709 | return 1; /* found */ | |
710 | } | |
711 | return 0; | |
712 | } | |
713 | ||
714 | ||
715 | static int | |
716 | cio_get_console_sch_no(void) | |
1da177e4 | 717 | { |
a8237fc4 | 718 | struct subchannel_id schid; |
1da177e4 | 719 | |
a8237fc4 | 720 | init_subchannel_id(&schid); |
1da177e4 LT |
721 | if (console_irq != -1) { |
722 | /* VM provided us with the irq number of the console. */ | |
a8237fc4 CH |
723 | schid.sch_no = console_irq; |
724 | if (stsch(schid, &console_subchannel.schib) != 0 || | |
b279a4f5 | 725 | (console_subchannel.schib.pmcw.st != SUBCHANNEL_TYPE_IO) || |
1da177e4 LT |
726 | !console_subchannel.schib.pmcw.dnv) |
727 | return -1; | |
728 | console_devno = console_subchannel.schib.pmcw.dev; | |
729 | } else if (console_devno != -1) { | |
730 | /* At least the console device number is known. */ | |
f97a56fb | 731 | for_each_subchannel(cio_test_for_console, NULL); |
1da177e4 LT |
732 | if (console_irq == -1) |
733 | return -1; | |
734 | } else { | |
735 | /* unlike in 2.4, we cannot autoprobe here, since | |
736 | * the channel subsystem is not fully initialized. | |
737 | * With some luck, the HWC console can take over */ | |
e556bbbd | 738 | printk(KERN_WARNING "cio: No ccw console found!\n"); |
1da177e4 LT |
739 | return -1; |
740 | } | |
741 | return console_irq; | |
742 | } | |
743 | ||
744 | struct subchannel * | |
745 | cio_probe_console(void) | |
746 | { | |
f97a56fb | 747 | int sch_no, ret; |
a8237fc4 | 748 | struct subchannel_id schid; |
1da177e4 LT |
749 | |
750 | if (xchg(&console_subchannel_in_use, 1) != 0) | |
751 | return ERR_PTR(-EBUSY); | |
f97a56fb CH |
752 | sch_no = cio_get_console_sch_no(); |
753 | if (sch_no == -1) { | |
1da177e4 LT |
754 | console_subchannel_in_use = 0; |
755 | return ERR_PTR(-ENODEV); | |
756 | } | |
757 | memset(&console_subchannel, 0, sizeof(struct subchannel)); | |
a8237fc4 | 758 | init_subchannel_id(&schid); |
f97a56fb | 759 | schid.sch_no = sch_no; |
a8237fc4 | 760 | ret = cio_validate_subchannel(&console_subchannel, schid); |
1da177e4 LT |
761 | if (ret) { |
762 | console_subchannel_in_use = 0; | |
763 | return ERR_PTR(-ENODEV); | |
764 | } | |
765 | ||
766 | /* | |
85b0d7c0 | 767 | * enable console I/O-interrupt subclass 1 |
1da177e4 | 768 | */ |
85b0d7c0 | 769 | ctl_set_bit(6, 30); |
85b0d7c0 | 770 | console_subchannel.schib.pmcw.isc = 1; |
1da177e4 | 771 | console_subchannel.schib.pmcw.intparm = |
cd6b4f27 | 772 | (u32)(addr_t)&console_subchannel; |
1da177e4 LT |
773 | ret = cio_modify(&console_subchannel); |
774 | if (ret) { | |
775 | console_subchannel_in_use = 0; | |
776 | return ERR_PTR(ret); | |
777 | } | |
778 | return &console_subchannel; | |
779 | } | |
780 | ||
781 | void | |
782 | cio_release_console(void) | |
783 | { | |
784 | console_subchannel.schib.pmcw.intparm = 0; | |
785 | cio_modify(&console_subchannel); | |
9689b336 | 786 | ctl_clear_bit(6, 30); |
1da177e4 LT |
787 | console_subchannel_in_use = 0; |
788 | } | |
789 | ||
790 | /* Bah... hack to catch console special sausages. */ | |
791 | int | |
a8237fc4 | 792 | cio_is_console(struct subchannel_id schid) |
1da177e4 LT |
793 | { |
794 | if (!console_subchannel_in_use) | |
795 | return 0; | |
a8237fc4 | 796 | return schid_equal(&schid, &console_subchannel.schid); |
1da177e4 LT |
797 | } |
798 | ||
799 | struct subchannel * | |
800 | cio_get_console_subchannel(void) | |
801 | { | |
802 | if (!console_subchannel_in_use) | |
d2c993d8 | 803 | return NULL; |
1da177e4 LT |
804 | return &console_subchannel; |
805 | } | |
806 | ||
807 | #endif | |
4d284cac | 808 | static int |
a8237fc4 | 809 | __disable_subchannel_easy(struct subchannel_id schid, struct schib *schib) |
1da177e4 LT |
810 | { |
811 | int retry, cc; | |
812 | ||
813 | cc = 0; | |
814 | for (retry=0;retry<3;retry++) { | |
815 | schib->pmcw.ena = 0; | |
816 | cc = msch(schid, schib); | |
817 | if (cc) | |
818 | return (cc==3?-ENODEV:-EBUSY); | |
819 | stsch(schid, schib); | |
820 | if (!schib->pmcw.ena) | |
821 | return 0; | |
822 | } | |
823 | return -EBUSY; /* uhm... */ | |
824 | } | |
825 | ||
d54853ef MS |
826 | /* we can't use the normal udelay here, since it enables external interrupts */ |
827 | ||
828 | static void udelay_reset(unsigned long usecs) | |
829 | { | |
830 | uint64_t start_cc, end_cc; | |
831 | ||
832 | asm volatile ("STCK %0" : "=m" (start_cc)); | |
833 | do { | |
834 | cpu_relax(); | |
835 | asm volatile ("STCK %0" : "=m" (end_cc)); | |
836 | } while (((end_cc - start_cc)/4096) < usecs); | |
837 | } | |
838 | ||
4d284cac | 839 | static int |
0ae7a7b2 | 840 | __clear_io_subchannel_easy(struct subchannel_id schid) |
1da177e4 LT |
841 | { |
842 | int retry; | |
843 | ||
844 | if (csch(schid)) | |
845 | return -ENODEV; | |
846 | for (retry=0;retry<20;retry++) { | |
847 | struct tpi_info ti; | |
848 | ||
849 | if (tpi(&ti)) { | |
a8237fc4 CH |
850 | tsch(ti.schid, (struct irb *)__LC_IRB); |
851 | if (schid_equal(&ti.schid, &schid)) | |
4c24da79 | 852 | return 0; |
1da177e4 | 853 | } |
d54853ef | 854 | udelay_reset(100); |
1da177e4 LT |
855 | } |
856 | return -EBUSY; | |
857 | } | |
858 | ||
a45e1414 MH |
859 | static int pgm_check_occured; |
860 | ||
861 | static void cio_reset_pgm_check_handler(void) | |
862 | { | |
863 | pgm_check_occured = 1; | |
864 | } | |
865 | ||
866 | static int stsch_reset(struct subchannel_id schid, volatile struct schib *addr) | |
867 | { | |
868 | int rc; | |
869 | ||
870 | pgm_check_occured = 0; | |
ab14de6c | 871 | s390_base_pgm_handler_fn = cio_reset_pgm_check_handler; |
6faf4444 | 872 | rc = stsch(schid, addr); |
ab14de6c | 873 | s390_base_pgm_handler_fn = NULL; |
aa77015c | 874 | |
ab14de6c | 875 | /* The program check handler could have changed pgm_check_occured. */ |
6faf4444 | 876 | barrier(); |
aa77015c | 877 | |
a45e1414 MH |
878 | if (pgm_check_occured) |
879 | return -EIO; | |
880 | else | |
881 | return rc; | |
882 | } | |
883 | ||
15e9b586 | 884 | static int __shutdown_subchannel_easy(struct subchannel_id schid, void *data) |
f97a56fb CH |
885 | { |
886 | struct schib schib; | |
887 | ||
a45e1414 | 888 | if (stsch_reset(schid, &schib)) |
f97a56fb CH |
889 | return -ENXIO; |
890 | if (!schib.pmcw.ena) | |
891 | return 0; | |
892 | switch(__disable_subchannel_easy(schid, &schib)) { | |
893 | case 0: | |
894 | case -ENODEV: | |
895 | break; | |
896 | default: /* -EBUSY */ | |
0ae7a7b2 CH |
897 | switch (schib.pmcw.st) { |
898 | case SUBCHANNEL_TYPE_IO: | |
899 | if (__clear_io_subchannel_easy(schid)) | |
900 | goto out; /* give up... */ | |
901 | break; | |
902 | default: | |
903 | /* No default clear strategy */ | |
904 | break; | |
905 | } | |
f97a56fb CH |
906 | stsch(schid, &schib); |
907 | __disable_subchannel_easy(schid, &schib); | |
908 | } | |
0ae7a7b2 | 909 | out: |
f97a56fb CH |
910 | return 0; |
911 | } | |
1da177e4 | 912 | |
15e9b586 HC |
913 | static atomic_t chpid_reset_count; |
914 | ||
915 | static void s390_reset_chpids_mcck_handler(void) | |
916 | { | |
917 | struct crw crw; | |
918 | struct mci *mci; | |
919 | ||
920 | /* Check for pending channel report word. */ | |
921 | mci = (struct mci *)&S390_lowcore.mcck_interruption_code; | |
922 | if (!mci->cp) | |
923 | return; | |
924 | /* Process channel report words. */ | |
925 | while (stcrw(&crw) == 0) { | |
926 | /* Check for responses to RCHP. */ | |
927 | if (crw.slct && crw.rsc == CRW_RSC_CPATH) | |
928 | atomic_dec(&chpid_reset_count); | |
929 | } | |
930 | } | |
931 | ||
932 | #define RCHP_TIMEOUT (30 * USEC_PER_SEC) | |
933 | static void css_reset(void) | |
934 | { | |
935 | int i, ret; | |
936 | unsigned long long timeout; | |
f86635fa | 937 | struct chp_id chpid; |
15e9b586 HC |
938 | |
939 | /* Reset subchannels. */ | |
940 | for_each_subchannel(__shutdown_subchannel_easy, NULL); | |
941 | /* Reset channel paths. */ | |
ab14de6c | 942 | s390_base_mcck_handler_fn = s390_reset_chpids_mcck_handler; |
15e9b586 HC |
943 | /* Enable channel report machine checks. */ |
944 | __ctl_set_bit(14, 28); | |
945 | /* Temporarily reenable machine checks. */ | |
946 | local_mcck_enable(); | |
f86635fa | 947 | chp_id_init(&chpid); |
15e9b586 | 948 | for (i = 0; i <= __MAX_CHPID; i++) { |
f86635fa PO |
949 | chpid.id = i; |
950 | ret = rchp(chpid); | |
15e9b586 HC |
951 | if ((ret == 0) || (ret == 2)) |
952 | /* | |
953 | * rchp either succeeded, or another rchp is already | |
954 | * in progress. In either case, we'll get a crw. | |
955 | */ | |
956 | atomic_inc(&chpid_reset_count); | |
957 | } | |
958 | /* Wait for machine check for all channel paths. */ | |
959 | timeout = get_clock() + (RCHP_TIMEOUT << 12); | |
960 | while (atomic_read(&chpid_reset_count) != 0) { | |
961 | if (get_clock() > timeout) | |
962 | break; | |
963 | cpu_relax(); | |
964 | } | |
965 | /* Disable machine checks again. */ | |
966 | local_mcck_disable(); | |
967 | /* Disable channel report machine checks. */ | |
968 | __ctl_clear_bit(14, 28); | |
ab14de6c | 969 | s390_base_mcck_handler_fn = NULL; |
15e9b586 HC |
970 | } |
971 | ||
972 | static struct reset_call css_reset_call = { | |
973 | .fn = css_reset, | |
974 | }; | |
975 | ||
976 | static int __init init_css_reset_call(void) | |
977 | { | |
978 | atomic_set(&chpid_reset_count, 0); | |
979 | register_reset_call(&css_reset_call); | |
980 | return 0; | |
981 | } | |
982 | ||
983 | arch_initcall(init_css_reset_call); | |
984 | ||
985 | struct sch_match_id { | |
986 | struct subchannel_id schid; | |
987 | struct ccw_dev_id devid; | |
988 | int rc; | |
989 | }; | |
990 | ||
991 | static int __reipl_subchannel_match(struct subchannel_id schid, void *data) | |
992 | { | |
993 | struct schib schib; | |
994 | struct sch_match_id *match_id = data; | |
995 | ||
a45e1414 | 996 | if (stsch_reset(schid, &schib)) |
15e9b586 | 997 | return -ENXIO; |
b279a4f5 | 998 | if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv && |
15e9b586 HC |
999 | (schib.pmcw.dev == match_id->devid.devno) && |
1000 | (schid.ssid == match_id->devid.ssid)) { | |
1001 | match_id->schid = schid; | |
1002 | match_id->rc = 0; | |
1003 | return 1; | |
1004 | } | |
1005 | return 0; | |
1006 | } | |
1007 | ||
1008 | static int reipl_find_schid(struct ccw_dev_id *devid, | |
1009 | struct subchannel_id *schid) | |
1da177e4 | 1010 | { |
ff6b8ea6 MH |
1011 | struct sch_match_id match_id; |
1012 | ||
1013 | match_id.devid = *devid; | |
1014 | match_id.rc = -ENODEV; | |
15e9b586 | 1015 | for_each_subchannel(__reipl_subchannel_match, &match_id); |
ff6b8ea6 MH |
1016 | if (match_id.rc == 0) |
1017 | *schid = match_id.schid; | |
1018 | return match_id.rc; | |
1da177e4 LT |
1019 | } |
1020 | ||
ff6b8ea6 MH |
1021 | extern void do_reipl_asm(__u32 schid); |
1022 | ||
1da177e4 | 1023 | /* Make sure all subchannels are quiet before we re-ipl an lpar. */ |
ff6b8ea6 | 1024 | void reipl_ccw_dev(struct ccw_dev_id *devid) |
1da177e4 | 1025 | { |
ff6b8ea6 MH |
1026 | struct subchannel_id schid; |
1027 | ||
15e9b586 HC |
1028 | s390_reset_system(); |
1029 | if (reipl_find_schid(devid, &schid) != 0) | |
ff6b8ea6 | 1030 | panic("IPL Device not found\n"); |
ff6b8ea6 | 1031 | do_reipl_asm(*((__u32*)&schid)); |
1da177e4 | 1032 | } |
e87bfe51 | 1033 | |
6fc321fd | 1034 | int __init cio_get_iplinfo(struct cio_iplinfo *iplinfo) |
e87bfe51 HC |
1035 | { |
1036 | struct subchannel_id schid; | |
6fc321fd | 1037 | struct schib schib; |
e87bfe51 HC |
1038 | |
1039 | schid = *(struct subchannel_id *)__LC_SUBCHANNEL_ID; | |
1040 | if (!schid.one) | |
6fc321fd HC |
1041 | return -ENODEV; |
1042 | if (stsch(schid, &schib)) | |
1043 | return -ENODEV; | |
b279a4f5 CH |
1044 | if (schib.pmcw.st != SUBCHANNEL_TYPE_IO) |
1045 | return -ENODEV; | |
6fc321fd HC |
1046 | if (!schib.pmcw.dnv) |
1047 | return -ENODEV; | |
1048 | iplinfo->devno = schib.pmcw.dev; | |
1049 | iplinfo->is_qdio = schib.pmcw.qf; | |
1050 | return 0; | |
e87bfe51 | 1051 | } |