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 | * |
aa77015c | 5 | * Copyright (C) IBM Corp. 1999,2006 |
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 | ||
42 | int cio_show_msg; | |
43 | ||
44 | static int __init | |
45 | cio_setup (char *parm) | |
46 | { | |
47 | if (!strcmp (parm, "yes")) | |
48 | cio_show_msg = 1; | |
49 | else if (!strcmp (parm, "no")) | |
50 | cio_show_msg = 0; | |
51 | else | |
e556bbbd CH |
52 | printk(KERN_ERR "cio: cio_setup: " |
53 | "invalid cio_msg parameter '%s'", parm); | |
1da177e4 LT |
54 | return 1; |
55 | } | |
56 | ||
57 | __setup ("cio_msg=", cio_setup); | |
58 | ||
59 | /* | |
60 | * Function: cio_debug_init | |
bc698bcf CH |
61 | * Initializes three debug logs for common I/O: |
62 | * - cio_msg logs generic cio messages | |
1da177e4 | 63 | * - cio_trace logs the calling of different functions |
bc698bcf | 64 | * - cio_crw logs machine check related cio messages |
1da177e4 | 65 | */ |
bc698bcf | 66 | static int __init cio_debug_init(void) |
1da177e4 | 67 | { |
361f494d | 68 | cio_debug_msg_id = debug_register("cio_msg", 16, 1, 16 * sizeof(long)); |
1da177e4 LT |
69 | if (!cio_debug_msg_id) |
70 | goto out_unregister; | |
bc698bcf CH |
71 | debug_register_view(cio_debug_msg_id, &debug_sprintf_view); |
72 | debug_set_level(cio_debug_msg_id, 2); | |
361f494d | 73 | cio_debug_trace_id = debug_register("cio_trace", 16, 1, 16); |
1da177e4 LT |
74 | if (!cio_debug_trace_id) |
75 | goto out_unregister; | |
bc698bcf CH |
76 | debug_register_view(cio_debug_trace_id, &debug_hex_ascii_view); |
77 | debug_set_level(cio_debug_trace_id, 2); | |
361f494d | 78 | cio_debug_crw_id = debug_register("cio_crw", 16, 1, 16 * sizeof(long)); |
1da177e4 LT |
79 | if (!cio_debug_crw_id) |
80 | goto out_unregister; | |
bc698bcf CH |
81 | debug_register_view(cio_debug_crw_id, &debug_sprintf_view); |
82 | debug_set_level(cio_debug_crw_id, 4); | |
1da177e4 LT |
83 | return 0; |
84 | ||
85 | out_unregister: | |
86 | if (cio_debug_msg_id) | |
bc698bcf | 87 | debug_unregister(cio_debug_msg_id); |
1da177e4 | 88 | if (cio_debug_trace_id) |
bc698bcf | 89 | debug_unregister(cio_debug_trace_id); |
1da177e4 | 90 | if (cio_debug_crw_id) |
bc698bcf | 91 | debug_unregister(cio_debug_crw_id); |
e556bbbd | 92 | printk(KERN_WARNING"cio: could not initialize debugging\n"); |
1da177e4 LT |
93 | return -1; |
94 | } | |
95 | ||
96 | arch_initcall (cio_debug_init); | |
97 | ||
98 | int | |
99 | cio_set_options (struct subchannel *sch, int flags) | |
100 | { | |
101 | sch->options.suspend = (flags & DOIO_ALLOW_SUSPEND) != 0; | |
102 | sch->options.prefetch = (flags & DOIO_DENY_PREFETCH) != 0; | |
103 | sch->options.inter = (flags & DOIO_SUPPRESS_INTER) != 0; | |
104 | return 0; | |
105 | } | |
106 | ||
107 | /* FIXME: who wants to use this? */ | |
108 | int | |
109 | cio_get_options (struct subchannel *sch) | |
110 | { | |
111 | int flags; | |
112 | ||
113 | flags = 0; | |
114 | if (sch->options.suspend) | |
115 | flags |= DOIO_ALLOW_SUSPEND; | |
116 | if (sch->options.prefetch) | |
117 | flags |= DOIO_DENY_PREFETCH; | |
118 | if (sch->options.inter) | |
119 | flags |= DOIO_SUPPRESS_INTER; | |
120 | return flags; | |
121 | } | |
122 | ||
123 | /* | |
124 | * Use tpi to get a pending interrupt, call the interrupt handler and | |
125 | * return a pointer to the subchannel structure. | |
126 | */ | |
4d284cac | 127 | static int |
1da177e4 LT |
128 | cio_tpi(void) |
129 | { | |
130 | struct tpi_info *tpi_info; | |
131 | struct subchannel *sch; | |
132 | struct irb *irb; | |
133 | ||
134 | tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID; | |
135 | if (tpi (NULL) != 1) | |
136 | return 0; | |
137 | irb = (struct irb *) __LC_IRB; | |
138 | /* Store interrupt response block to lowcore. */ | |
a8237fc4 | 139 | if (tsch (tpi_info->schid, irb) != 0) |
1da177e4 LT |
140 | /* Not status pending or not operational. */ |
141 | return 1; | |
142 | sch = (struct subchannel *)(unsigned long)tpi_info->intparm; | |
143 | if (!sch) | |
144 | return 1; | |
145 | local_bh_disable(); | |
146 | irq_enter (); | |
2ec22984 | 147 | spin_lock(sch->lock); |
1da177e4 LT |
148 | memcpy (&sch->schib.scsw, &irb->scsw, sizeof (struct scsw)); |
149 | if (sch->driver && sch->driver->irq) | |
602b20f2 | 150 | sch->driver->irq(sch); |
2ec22984 | 151 | spin_unlock(sch->lock); |
1da177e4 | 152 | irq_exit (); |
1f194a4c | 153 | _local_bh_enable(); |
1da177e4 LT |
154 | return 1; |
155 | } | |
156 | ||
4d284cac | 157 | static int |
1da177e4 LT |
158 | cio_start_handle_notoper(struct subchannel *sch, __u8 lpm) |
159 | { | |
160 | char dbf_text[15]; | |
161 | ||
162 | if (lpm != 0) | |
163 | sch->lpm &= ~lpm; | |
164 | else | |
165 | sch->lpm = 0; | |
166 | ||
a8237fc4 | 167 | stsch (sch->schid, &sch->schib); |
1da177e4 LT |
168 | |
169 | CIO_MSG_EVENT(0, "cio_start: 'not oper' status for " | |
fb6958a5 CH |
170 | "subchannel 0.%x.%04x!\n", sch->schid.ssid, |
171 | sch->schid.sch_no); | |
1da177e4 LT |
172 | sprintf(dbf_text, "no%s", sch->dev.bus_id); |
173 | CIO_TRACE_EVENT(0, dbf_text); | |
174 | CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib)); | |
175 | ||
176 | return (sch->lpm ? -EACCES : -ENODEV); | |
177 | } | |
178 | ||
179 | int | |
180 | cio_start_key (struct subchannel *sch, /* subchannel structure */ | |
181 | struct ccw1 * cpa, /* logical channel prog addr */ | |
182 | __u8 lpm, /* logical path mask */ | |
183 | __u8 key) /* storage key */ | |
184 | { | |
185 | char dbf_txt[15]; | |
186 | int ccode; | |
cd6b4f27 | 187 | struct orb *orb; |
1da177e4 | 188 | |
cd6b4f27 CH |
189 | CIO_TRACE_EVENT(4, "stIO"); |
190 | CIO_TRACE_EVENT(4, sch->dev.bus_id); | |
1da177e4 | 191 | |
cd6b4f27 | 192 | orb = &to_io_private(sch)->orb; |
1da177e4 | 193 | /* sch is always under 2G. */ |
cd6b4f27 CH |
194 | orb->intparm = (u32)(addr_t)sch; |
195 | orb->fmt = 1; | |
1da177e4 | 196 | |
cd6b4f27 CH |
197 | orb->pfch = sch->options.prefetch == 0; |
198 | orb->spnd = sch->options.suspend; | |
199 | orb->ssic = sch->options.suspend && sch->options.inter; | |
200 | orb->lpm = (lpm != 0) ? lpm : sch->lpm; | |
347a8dc3 | 201 | #ifdef CONFIG_64BIT |
1da177e4 LT |
202 | /* |
203 | * for 64 bit we always support 64 bit IDAWs with 4k page size only | |
204 | */ | |
cd6b4f27 CH |
205 | orb->c64 = 1; |
206 | orb->i2k = 0; | |
1da177e4 | 207 | #endif |
cd6b4f27 | 208 | orb->key = key >> 4; |
1da177e4 | 209 | /* issue "Start Subchannel" */ |
cd6b4f27 CH |
210 | orb->cpa = (__u32) __pa(cpa); |
211 | ccode = ssch(sch->schid, orb); | |
1da177e4 LT |
212 | |
213 | /* process condition code */ | |
cd6b4f27 CH |
214 | sprintf(dbf_txt, "ccode:%d", ccode); |
215 | CIO_TRACE_EVENT(4, dbf_txt); | |
1da177e4 LT |
216 | |
217 | switch (ccode) { | |
218 | case 0: | |
219 | /* | |
220 | * initialize device status information | |
221 | */ | |
222 | sch->schib.scsw.actl |= SCSW_ACTL_START_PEND; | |
223 | return 0; | |
224 | case 1: /* status pending */ | |
225 | case 2: /* busy */ | |
226 | return -EBUSY; | |
227 | default: /* device/path not operational */ | |
228 | return cio_start_handle_notoper(sch, lpm); | |
229 | } | |
230 | } | |
231 | ||
232 | int | |
233 | cio_start (struct subchannel *sch, struct ccw1 *cpa, __u8 lpm) | |
234 | { | |
0b642ede | 235 | return cio_start_key(sch, cpa, lpm, PAGE_DEFAULT_KEY); |
1da177e4 LT |
236 | } |
237 | ||
238 | /* | |
239 | * resume suspended I/O operation | |
240 | */ | |
241 | int | |
242 | cio_resume (struct subchannel *sch) | |
243 | { | |
244 | char dbf_txt[15]; | |
245 | int ccode; | |
246 | ||
247 | CIO_TRACE_EVENT (4, "resIO"); | |
248 | CIO_TRACE_EVENT (4, sch->dev.bus_id); | |
249 | ||
a8237fc4 | 250 | ccode = rsch (sch->schid); |
1da177e4 LT |
251 | |
252 | sprintf (dbf_txt, "ccode:%d", ccode); | |
253 | CIO_TRACE_EVENT (4, dbf_txt); | |
254 | ||
255 | switch (ccode) { | |
256 | case 0: | |
257 | sch->schib.scsw.actl |= SCSW_ACTL_RESUME_PEND; | |
258 | return 0; | |
259 | case 1: | |
260 | return -EBUSY; | |
261 | case 2: | |
262 | return -EINVAL; | |
263 | default: | |
264 | /* | |
265 | * useless to wait for request completion | |
266 | * as device is no longer operational ! | |
267 | */ | |
268 | return -ENODEV; | |
269 | } | |
270 | } | |
271 | ||
272 | /* | |
273 | * halt I/O operation | |
274 | */ | |
275 | int | |
276 | cio_halt(struct subchannel *sch) | |
277 | { | |
278 | char dbf_txt[15]; | |
279 | int ccode; | |
280 | ||
281 | if (!sch) | |
282 | return -ENODEV; | |
283 | ||
284 | CIO_TRACE_EVENT (2, "haltIO"); | |
285 | CIO_TRACE_EVENT (2, sch->dev.bus_id); | |
286 | ||
287 | /* | |
288 | * Issue "Halt subchannel" and process condition code | |
289 | */ | |
a8237fc4 | 290 | ccode = hsch (sch->schid); |
1da177e4 LT |
291 | |
292 | sprintf (dbf_txt, "ccode:%d", ccode); | |
293 | CIO_TRACE_EVENT (2, dbf_txt); | |
294 | ||
295 | switch (ccode) { | |
296 | case 0: | |
297 | sch->schib.scsw.actl |= SCSW_ACTL_HALT_PEND; | |
298 | return 0; | |
299 | case 1: /* status pending */ | |
300 | case 2: /* busy */ | |
301 | return -EBUSY; | |
302 | default: /* device not operational */ | |
303 | return -ENODEV; | |
304 | } | |
305 | } | |
306 | ||
307 | /* | |
308 | * Clear I/O operation | |
309 | */ | |
310 | int | |
311 | cio_clear(struct subchannel *sch) | |
312 | { | |
313 | char dbf_txt[15]; | |
314 | int ccode; | |
315 | ||
316 | if (!sch) | |
317 | return -ENODEV; | |
318 | ||
319 | CIO_TRACE_EVENT (2, "clearIO"); | |
320 | CIO_TRACE_EVENT (2, sch->dev.bus_id); | |
321 | ||
322 | /* | |
323 | * Issue "Clear subchannel" and process condition code | |
324 | */ | |
a8237fc4 | 325 | ccode = csch (sch->schid); |
1da177e4 LT |
326 | |
327 | sprintf (dbf_txt, "ccode:%d", ccode); | |
328 | CIO_TRACE_EVENT (2, dbf_txt); | |
329 | ||
330 | switch (ccode) { | |
331 | case 0: | |
332 | sch->schib.scsw.actl |= SCSW_ACTL_CLEAR_PEND; | |
333 | return 0; | |
334 | default: /* device not operational */ | |
335 | return -ENODEV; | |
336 | } | |
337 | } | |
338 | ||
339 | /* | |
340 | * Function: cio_cancel | |
341 | * Issues a "Cancel Subchannel" on the specified subchannel | |
342 | * Note: We don't need any fancy intparms and flags here | |
343 | * since xsch is executed synchronously. | |
344 | * Only for common I/O internal use as for now. | |
345 | */ | |
346 | int | |
347 | cio_cancel (struct subchannel *sch) | |
348 | { | |
349 | char dbf_txt[15]; | |
350 | int ccode; | |
351 | ||
352 | if (!sch) | |
353 | return -ENODEV; | |
354 | ||
355 | CIO_TRACE_EVENT (2, "cancelIO"); | |
356 | CIO_TRACE_EVENT (2, sch->dev.bus_id); | |
357 | ||
a8237fc4 | 358 | ccode = xsch (sch->schid); |
1da177e4 LT |
359 | |
360 | sprintf (dbf_txt, "ccode:%d", ccode); | |
361 | CIO_TRACE_EVENT (2, dbf_txt); | |
362 | ||
363 | switch (ccode) { | |
364 | case 0: /* success */ | |
365 | /* Update information in scsw. */ | |
a8237fc4 | 366 | stsch (sch->schid, &sch->schib); |
1da177e4 LT |
367 | return 0; |
368 | case 1: /* status pending */ | |
369 | return -EBUSY; | |
370 | case 2: /* not applicable */ | |
371 | return -EINVAL; | |
372 | default: /* not oper */ | |
373 | return -ENODEV; | |
374 | } | |
375 | } | |
376 | ||
377 | /* | |
378 | * Function: cio_modify | |
379 | * Issues a "Modify Subchannel" on the specified subchannel | |
380 | */ | |
381 | int | |
382 | cio_modify (struct subchannel *sch) | |
383 | { | |
384 | int ccode, retry, ret; | |
385 | ||
386 | ret = 0; | |
387 | for (retry = 0; retry < 5; retry++) { | |
a8237fc4 | 388 | ccode = msch_err (sch->schid, &sch->schib); |
1da177e4 LT |
389 | if (ccode < 0) /* -EIO if msch gets a program check. */ |
390 | return ccode; | |
391 | switch (ccode) { | |
392 | case 0: /* successfull */ | |
393 | return 0; | |
394 | case 1: /* status pending */ | |
395 | return -EBUSY; | |
396 | case 2: /* busy */ | |
397 | udelay (100); /* allow for recovery */ | |
398 | ret = -EBUSY; | |
399 | break; | |
400 | case 3: /* not operational */ | |
401 | return -ENODEV; | |
402 | } | |
403 | } | |
404 | return ret; | |
405 | } | |
406 | ||
407 | /* | |
408 | * Enable subchannel. | |
409 | */ | |
b279a4f5 CH |
410 | int cio_enable_subchannel(struct subchannel *sch, unsigned int isc, |
411 | u32 intparm) | |
1da177e4 LT |
412 | { |
413 | char dbf_txt[15]; | |
414 | int ccode; | |
415 | int retry; | |
416 | int ret; | |
417 | ||
418 | CIO_TRACE_EVENT (2, "ensch"); | |
419 | CIO_TRACE_EVENT (2, sch->dev.bus_id); | |
420 | ||
d7b5a4c9 CH |
421 | if (sch_is_pseudo_sch(sch)) |
422 | return -EINVAL; | |
a8237fc4 | 423 | ccode = stsch (sch->schid, &sch->schib); |
1da177e4 LT |
424 | if (ccode) |
425 | return -ENODEV; | |
426 | ||
427 | for (retry = 5, ret = 0; retry > 0; retry--) { | |
428 | sch->schib.pmcw.ena = 1; | |
429 | sch->schib.pmcw.isc = isc; | |
b279a4f5 | 430 | sch->schib.pmcw.intparm = intparm; |
1da177e4 LT |
431 | ret = cio_modify(sch); |
432 | if (ret == -ENODEV) | |
433 | break; | |
434 | if (ret == -EIO) | |
435 | /* | |
436 | * Got a program check in cio_modify. Try without | |
437 | * the concurrent sense bit the next time. | |
438 | */ | |
439 | sch->schib.pmcw.csense = 0; | |
440 | if (ret == 0) { | |
a8237fc4 | 441 | stsch (sch->schid, &sch->schib); |
1da177e4 LT |
442 | if (sch->schib.pmcw.ena) |
443 | break; | |
444 | } | |
445 | if (ret == -EBUSY) { | |
446 | struct irb irb; | |
a8237fc4 | 447 | if (tsch(sch->schid, &irb) != 0) |
1da177e4 LT |
448 | break; |
449 | } | |
450 | } | |
451 | sprintf (dbf_txt, "ret:%d", ret); | |
452 | CIO_TRACE_EVENT (2, dbf_txt); | |
453 | return ret; | |
454 | } | |
455 | ||
456 | /* | |
457 | * Disable subchannel. | |
458 | */ | |
459 | int | |
460 | cio_disable_subchannel (struct subchannel *sch) | |
461 | { | |
462 | char dbf_txt[15]; | |
463 | int ccode; | |
464 | int retry; | |
465 | int ret; | |
466 | ||
467 | CIO_TRACE_EVENT (2, "dissch"); | |
468 | CIO_TRACE_EVENT (2, sch->dev.bus_id); | |
469 | ||
d7b5a4c9 CH |
470 | if (sch_is_pseudo_sch(sch)) |
471 | return 0; | |
a8237fc4 | 472 | ccode = stsch (sch->schid, &sch->schib); |
1da177e4 LT |
473 | if (ccode == 3) /* Not operational. */ |
474 | return -ENODEV; | |
475 | ||
476 | if (sch->schib.scsw.actl != 0) | |
477 | /* | |
478 | * the disable function must not be called while there are | |
479 | * requests pending for completion ! | |
480 | */ | |
481 | return -EBUSY; | |
482 | ||
483 | for (retry = 5, ret = 0; retry > 0; retry--) { | |
484 | sch->schib.pmcw.ena = 0; | |
485 | ret = cio_modify(sch); | |
486 | if (ret == -ENODEV) | |
487 | break; | |
488 | if (ret == -EBUSY) | |
489 | /* | |
490 | * The subchannel is busy or status pending. | |
491 | * We'll disable when the next interrupt was delivered | |
492 | * via the state machine. | |
493 | */ | |
494 | break; | |
495 | if (ret == 0) { | |
a8237fc4 | 496 | stsch (sch->schid, &sch->schib); |
1da177e4 LT |
497 | if (!sch->schib.pmcw.ena) |
498 | break; | |
499 | } | |
500 | } | |
501 | sprintf (dbf_txt, "ret:%d", ret); | |
502 | CIO_TRACE_EVENT (2, dbf_txt); | |
503 | return ret; | |
504 | } | |
505 | ||
d7b5a4c9 | 506 | int cio_create_sch_lock(struct subchannel *sch) |
2ec22984 CH |
507 | { |
508 | sch->lock = kmalloc(sizeof(spinlock_t), GFP_KERNEL); | |
509 | if (!sch->lock) | |
510 | return -ENOMEM; | |
511 | spin_lock_init(sch->lock); | |
512 | return 0; | |
513 | } | |
514 | ||
1da177e4 LT |
515 | /* |
516 | * cio_validate_subchannel() | |
517 | * | |
518 | * Find out subchannel type and initialize struct subchannel. | |
519 | * Return codes: | |
520 | * SUBCHANNEL_TYPE_IO for a normal io subchannel | |
521 | * SUBCHANNEL_TYPE_CHSC for a chsc subchannel | |
522 | * SUBCHANNEL_TYPE_MESSAGE for a messaging subchannel | |
523 | * SUBCHANNEL_TYPE_ADM for a adm(?) subchannel | |
524 | * -ENXIO for non-defined subchannels | |
525 | * -ENODEV for subchannels with invalid device number or blacklisted devices | |
526 | */ | |
527 | int | |
a8237fc4 | 528 | cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid) |
1da177e4 LT |
529 | { |
530 | char dbf_txt[15]; | |
531 | int ccode; | |
2ec22984 | 532 | int err; |
1da177e4 | 533 | |
a8237fc4 | 534 | sprintf (dbf_txt, "valsch%x", schid.sch_no); |
1da177e4 LT |
535 | CIO_TRACE_EVENT (4, dbf_txt); |
536 | ||
537 | /* Nuke all fields. */ | |
538 | memset(sch, 0, sizeof(struct subchannel)); | |
539 | ||
2ec22984 CH |
540 | sch->schid = schid; |
541 | if (cio_is_console(schid)) { | |
542 | sch->lock = cio_get_console_lock(); | |
543 | } else { | |
544 | err = cio_create_sch_lock(sch); | |
545 | if (err) | |
546 | goto out; | |
547 | } | |
6ab4879a | 548 | mutex_init(&sch->reg_mutex); |
1da177e4 | 549 | /* Set a name for the subchannel */ |
fb6958a5 CH |
550 | snprintf (sch->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x", schid.ssid, |
551 | schid.sch_no); | |
1da177e4 LT |
552 | |
553 | /* | |
554 | * The first subchannel that is not-operational (ccode==3) | |
555 | * indicates that there aren't any more devices available. | |
fb6958a5 CH |
556 | * If stsch gets an exception, it means the current subchannel set |
557 | * is not valid. | |
1da177e4 | 558 | */ |
fb6958a5 | 559 | ccode = stsch_err (schid, &sch->schib); |
2ec22984 CH |
560 | if (ccode) { |
561 | err = (ccode == 3) ? -ENXIO : ccode; | |
562 | goto out; | |
563 | } | |
1da177e4 LT |
564 | /* Copy subchannel type from path management control word. */ |
565 | sch->st = sch->schib.pmcw.st; | |
566 | ||
567 | /* | |
568 | * ... just being curious we check for non I/O subchannels | |
569 | */ | |
570 | if (sch->st != 0) { | |
571 | CIO_DEBUG(KERN_INFO, 0, | |
bc698bcf | 572 | "Subchannel 0.%x.%04x reports " |
1da177e4 | 573 | "non-I/O subchannel type %04X\n", |
fb6958a5 | 574 | sch->schid.ssid, sch->schid.sch_no, sch->st); |
1da177e4 | 575 | /* We stop here for non-io subchannels. */ |
2ec22984 CH |
576 | err = sch->st; |
577 | goto out; | |
1da177e4 LT |
578 | } |
579 | ||
580 | /* Initialization for io subchannels. */ | |
808e4888 ME |
581 | if (!css_sch_is_valid(&sch->schib)) { |
582 | err = -ENODEV; | |
583 | goto out; | |
584 | } | |
585 | ||
1da177e4 | 586 | /* Devno is valid. */ |
fb6958a5 | 587 | if (is_blacklisted (sch->schid.ssid, sch->schib.pmcw.dev)) { |
1da177e4 LT |
588 | /* |
589 | * This device must not be known to Linux. So we simply | |
590 | * say that there is no device and return ENODEV. | |
591 | */ | |
347d59d7 | 592 | CIO_MSG_EVENT(4, "Blacklisted device detected " |
fb6958a5 CH |
593 | "at devno %04X, subchannel set %x\n", |
594 | sch->schib.pmcw.dev, sch->schid.ssid); | |
2ec22984 CH |
595 | err = -ENODEV; |
596 | goto out; | |
1da177e4 | 597 | } |
e6b6e10a PO |
598 | if (cio_is_console(sch->schid)) |
599 | sch->opm = 0xff; | |
600 | else | |
601 | sch->opm = chp_get_sch_opm(sch); | |
28bdc6f6 | 602 | sch->lpm = sch->schib.pmcw.pam & sch->opm; |
1da177e4 LT |
603 | |
604 | CIO_DEBUG(KERN_INFO, 0, | |
bc698bcf | 605 | "Detected device %04x on subchannel 0.%x.%04X" |
1da177e4 | 606 | " - PIM = %02X, PAM = %02X, POM = %02X\n", |
fb6958a5 CH |
607 | sch->schib.pmcw.dev, sch->schid.ssid, |
608 | sch->schid.sch_no, sch->schib.pmcw.pim, | |
1da177e4 LT |
609 | sch->schib.pmcw.pam, sch->schib.pmcw.pom); |
610 | ||
611 | /* | |
612 | * We now have to initially ... | |
613 | * ... set "interruption subclass" | |
614 | * ... enable "concurrent sense" | |
615 | * ... enable "multipath mode" if more than one | |
616 | * CHPID is available. This is done regardless | |
617 | * whether multiple paths are available for us. | |
618 | */ | |
619 | sch->schib.pmcw.isc = 3; /* could be smth. else */ | |
620 | sch->schib.pmcw.csense = 1; /* concurrent sense */ | |
621 | sch->schib.pmcw.ena = 0; | |
622 | if ((sch->lpm & (sch->lpm - 1)) != 0) | |
623 | sch->schib.pmcw.mp = 1; /* multipath mode */ | |
1842f2b1 CH |
624 | /* clean up possible residual cmf stuff */ |
625 | sch->schib.pmcw.mme = 0; | |
626 | sch->schib.pmcw.mbfc = 0; | |
627 | sch->schib.pmcw.mbi = 0; | |
628 | sch->schib.mba = 0; | |
1da177e4 | 629 | return 0; |
2ec22984 CH |
630 | out: |
631 | if (!cio_is_console(schid)) | |
632 | kfree(sch->lock); | |
633 | sch->lock = NULL; | |
634 | return err; | |
1da177e4 LT |
635 | } |
636 | ||
637 | /* | |
638 | * do_IRQ() handles all normal I/O device IRQ's (the special | |
639 | * SMP cross-CPU interrupts have their own specific | |
640 | * handlers). | |
641 | * | |
642 | */ | |
643 | void | |
644 | do_IRQ (struct pt_regs *regs) | |
645 | { | |
646 | struct tpi_info *tpi_info; | |
647 | struct subchannel *sch; | |
648 | struct irb *irb; | |
5a489b98 | 649 | struct pt_regs *old_regs; |
1da177e4 | 650 | |
5a489b98 | 651 | old_regs = set_irq_regs(regs); |
9d0a57cb | 652 | irq_enter(); |
43ca5c3a | 653 | s390_idle_check(); |
5a62b192 HC |
654 | if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator) |
655 | /* Serve timer interrupts first. */ | |
656 | clock_comparator_work(); | |
1da177e4 LT |
657 | /* |
658 | * Get interrupt information from lowcore | |
659 | */ | |
660 | tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID; | |
661 | irb = (struct irb *) __LC_IRB; | |
662 | do { | |
663 | kstat_cpu(smp_processor_id()).irqs[IO_INTERRUPT]++; | |
664 | /* | |
665 | * Non I/O-subchannel thin interrupts are processed differently | |
666 | */ | |
667 | if (tpi_info->adapter_IO == 1 && | |
668 | tpi_info->int_type == IO_INTERRUPT_TYPE) { | |
669 | do_adapter_IO(); | |
670 | continue; | |
671 | } | |
672 | sch = (struct subchannel *)(unsigned long)tpi_info->intparm; | |
673 | if (sch) | |
2ec22984 | 674 | spin_lock(sch->lock); |
1da177e4 | 675 | /* Store interrupt response block to lowcore. */ |
a8237fc4 | 676 | if (tsch (tpi_info->schid, irb) == 0 && sch) { |
1da177e4 LT |
677 | /* Keep subchannel information word up to date. */ |
678 | memcpy (&sch->schib.scsw, &irb->scsw, | |
679 | sizeof (irb->scsw)); | |
680 | /* Call interrupt handler if there is one. */ | |
681 | if (sch->driver && sch->driver->irq) | |
602b20f2 | 682 | sch->driver->irq(sch); |
1da177e4 LT |
683 | } |
684 | if (sch) | |
2ec22984 | 685 | spin_unlock(sch->lock); |
1da177e4 LT |
686 | /* |
687 | * Are more interrupts pending? | |
688 | * If so, the tpi instruction will update the lowcore | |
689 | * to hold the info for the next interrupt. | |
690 | * We don't do this for VM because a tpi drops the cpu | |
691 | * out of the sie which costs more cycles than it saves. | |
692 | */ | |
693 | } while (!MACHINE_IS_VM && tpi (NULL) != 0); | |
9d0a57cb | 694 | irq_exit(); |
5a489b98 | 695 | set_irq_regs(old_regs); |
1da177e4 LT |
696 | } |
697 | ||
698 | #ifdef CONFIG_CCW_CONSOLE | |
699 | static struct subchannel console_subchannel; | |
cd6b4f27 | 700 | static struct io_subchannel_private console_priv; |
1da177e4 LT |
701 | static int console_subchannel_in_use; |
702 | ||
cd6b4f27 CH |
703 | void *cio_get_console_priv(void) |
704 | { | |
705 | return &console_priv; | |
706 | } | |
707 | ||
1da177e4 LT |
708 | /* |
709 | * busy wait for the next interrupt on the console | |
710 | */ | |
711 | void | |
712 | wait_cons_dev (void) | |
713 | { | |
714 | unsigned long cr6 __attribute__ ((aligned (8))); | |
715 | unsigned long save_cr6 __attribute__ ((aligned (8))); | |
716 | ||
717 | /* | |
718 | * before entering the spinlock we may already have | |
719 | * processed the interrupt on a different CPU... | |
720 | */ | |
721 | if (!console_subchannel_in_use) | |
722 | return; | |
723 | ||
724 | /* disable all but isc 7 (console device) */ | |
725 | __ctl_store (save_cr6, 6, 6); | |
726 | cr6 = 0x01000000; | |
727 | __ctl_load (cr6, 6, 6); | |
728 | ||
729 | do { | |
2ec22984 | 730 | spin_unlock(console_subchannel.lock); |
1da177e4 LT |
731 | if (!cio_tpi()) |
732 | cpu_relax(); | |
2ec22984 | 733 | spin_lock(console_subchannel.lock); |
1da177e4 LT |
734 | } while (console_subchannel.schib.scsw.actl != 0); |
735 | /* | |
736 | * restore previous isc value | |
737 | */ | |
738 | __ctl_load (save_cr6, 6, 6); | |
739 | } | |
740 | ||
741 | static int | |
f97a56fb CH |
742 | cio_test_for_console(struct subchannel_id schid, void *data) |
743 | { | |
fb6958a5 | 744 | if (stsch_err(schid, &console_subchannel.schib) != 0) |
f97a56fb | 745 | return -ENXIO; |
b279a4f5 CH |
746 | if ((console_subchannel.schib.pmcw.st == SUBCHANNEL_TYPE_IO) && |
747 | console_subchannel.schib.pmcw.dnv && | |
748 | (console_subchannel.schib.pmcw.dev == console_devno)) { | |
f97a56fb CH |
749 | console_irq = schid.sch_no; |
750 | return 1; /* found */ | |
751 | } | |
752 | return 0; | |
753 | } | |
754 | ||
755 | ||
756 | static int | |
757 | cio_get_console_sch_no(void) | |
1da177e4 | 758 | { |
a8237fc4 | 759 | struct subchannel_id schid; |
1da177e4 | 760 | |
a8237fc4 | 761 | init_subchannel_id(&schid); |
1da177e4 LT |
762 | if (console_irq != -1) { |
763 | /* VM provided us with the irq number of the console. */ | |
a8237fc4 CH |
764 | schid.sch_no = console_irq; |
765 | if (stsch(schid, &console_subchannel.schib) != 0 || | |
b279a4f5 | 766 | (console_subchannel.schib.pmcw.st != SUBCHANNEL_TYPE_IO) || |
1da177e4 LT |
767 | !console_subchannel.schib.pmcw.dnv) |
768 | return -1; | |
769 | console_devno = console_subchannel.schib.pmcw.dev; | |
770 | } else if (console_devno != -1) { | |
771 | /* At least the console device number is known. */ | |
f97a56fb | 772 | for_each_subchannel(cio_test_for_console, NULL); |
1da177e4 LT |
773 | if (console_irq == -1) |
774 | return -1; | |
775 | } else { | |
776 | /* unlike in 2.4, we cannot autoprobe here, since | |
777 | * the channel subsystem is not fully initialized. | |
778 | * With some luck, the HWC console can take over */ | |
e556bbbd | 779 | printk(KERN_WARNING "cio: No ccw console found!\n"); |
1da177e4 LT |
780 | return -1; |
781 | } | |
782 | return console_irq; | |
783 | } | |
784 | ||
785 | struct subchannel * | |
786 | cio_probe_console(void) | |
787 | { | |
f97a56fb | 788 | int sch_no, ret; |
a8237fc4 | 789 | struct subchannel_id schid; |
1da177e4 LT |
790 | |
791 | if (xchg(&console_subchannel_in_use, 1) != 0) | |
792 | return ERR_PTR(-EBUSY); | |
f97a56fb CH |
793 | sch_no = cio_get_console_sch_no(); |
794 | if (sch_no == -1) { | |
1da177e4 LT |
795 | console_subchannel_in_use = 0; |
796 | return ERR_PTR(-ENODEV); | |
797 | } | |
798 | memset(&console_subchannel, 0, sizeof(struct subchannel)); | |
a8237fc4 | 799 | init_subchannel_id(&schid); |
f97a56fb | 800 | schid.sch_no = sch_no; |
a8237fc4 | 801 | ret = cio_validate_subchannel(&console_subchannel, schid); |
1da177e4 LT |
802 | if (ret) { |
803 | console_subchannel_in_use = 0; | |
804 | return ERR_PTR(-ENODEV); | |
805 | } | |
806 | ||
807 | /* | |
808 | * enable console I/O-interrupt subclass 7 | |
809 | */ | |
810 | ctl_set_bit(6, 24); | |
811 | console_subchannel.schib.pmcw.isc = 7; | |
812 | console_subchannel.schib.pmcw.intparm = | |
cd6b4f27 | 813 | (u32)(addr_t)&console_subchannel; |
1da177e4 LT |
814 | ret = cio_modify(&console_subchannel); |
815 | if (ret) { | |
816 | console_subchannel_in_use = 0; | |
817 | return ERR_PTR(ret); | |
818 | } | |
819 | return &console_subchannel; | |
820 | } | |
821 | ||
822 | void | |
823 | cio_release_console(void) | |
824 | { | |
825 | console_subchannel.schib.pmcw.intparm = 0; | |
826 | cio_modify(&console_subchannel); | |
827 | ctl_clear_bit(6, 24); | |
828 | console_subchannel_in_use = 0; | |
829 | } | |
830 | ||
831 | /* Bah... hack to catch console special sausages. */ | |
832 | int | |
a8237fc4 | 833 | cio_is_console(struct subchannel_id schid) |
1da177e4 LT |
834 | { |
835 | if (!console_subchannel_in_use) | |
836 | return 0; | |
a8237fc4 | 837 | return schid_equal(&schid, &console_subchannel.schid); |
1da177e4 LT |
838 | } |
839 | ||
840 | struct subchannel * | |
841 | cio_get_console_subchannel(void) | |
842 | { | |
843 | if (!console_subchannel_in_use) | |
d2c993d8 | 844 | return NULL; |
1da177e4 LT |
845 | return &console_subchannel; |
846 | } | |
847 | ||
848 | #endif | |
4d284cac | 849 | static int |
a8237fc4 | 850 | __disable_subchannel_easy(struct subchannel_id schid, struct schib *schib) |
1da177e4 LT |
851 | { |
852 | int retry, cc; | |
853 | ||
854 | cc = 0; | |
855 | for (retry=0;retry<3;retry++) { | |
856 | schib->pmcw.ena = 0; | |
857 | cc = msch(schid, schib); | |
858 | if (cc) | |
859 | return (cc==3?-ENODEV:-EBUSY); | |
860 | stsch(schid, schib); | |
861 | if (!schib->pmcw.ena) | |
862 | return 0; | |
863 | } | |
864 | return -EBUSY; /* uhm... */ | |
865 | } | |
866 | ||
d54853ef MS |
867 | /* we can't use the normal udelay here, since it enables external interrupts */ |
868 | ||
869 | static void udelay_reset(unsigned long usecs) | |
870 | { | |
871 | uint64_t start_cc, end_cc; | |
872 | ||
873 | asm volatile ("STCK %0" : "=m" (start_cc)); | |
874 | do { | |
875 | cpu_relax(); | |
876 | asm volatile ("STCK %0" : "=m" (end_cc)); | |
877 | } while (((end_cc - start_cc)/4096) < usecs); | |
878 | } | |
879 | ||
4d284cac | 880 | static int |
a8237fc4 | 881 | __clear_subchannel_easy(struct subchannel_id schid) |
1da177e4 LT |
882 | { |
883 | int retry; | |
884 | ||
885 | if (csch(schid)) | |
886 | return -ENODEV; | |
887 | for (retry=0;retry<20;retry++) { | |
888 | struct tpi_info ti; | |
889 | ||
890 | if (tpi(&ti)) { | |
a8237fc4 CH |
891 | tsch(ti.schid, (struct irb *)__LC_IRB); |
892 | if (schid_equal(&ti.schid, &schid)) | |
4c24da79 | 893 | return 0; |
1da177e4 | 894 | } |
d54853ef | 895 | udelay_reset(100); |
1da177e4 LT |
896 | } |
897 | return -EBUSY; | |
898 | } | |
899 | ||
a45e1414 MH |
900 | static int pgm_check_occured; |
901 | ||
902 | static void cio_reset_pgm_check_handler(void) | |
903 | { | |
904 | pgm_check_occured = 1; | |
905 | } | |
906 | ||
907 | static int stsch_reset(struct subchannel_id schid, volatile struct schib *addr) | |
908 | { | |
909 | int rc; | |
910 | ||
911 | pgm_check_occured = 0; | |
ab14de6c | 912 | s390_base_pgm_handler_fn = cio_reset_pgm_check_handler; |
6faf4444 | 913 | rc = stsch(schid, addr); |
ab14de6c | 914 | s390_base_pgm_handler_fn = NULL; |
aa77015c | 915 | |
ab14de6c | 916 | /* The program check handler could have changed pgm_check_occured. */ |
6faf4444 | 917 | barrier(); |
aa77015c | 918 | |
a45e1414 MH |
919 | if (pgm_check_occured) |
920 | return -EIO; | |
921 | else | |
922 | return rc; | |
923 | } | |
924 | ||
15e9b586 | 925 | static int __shutdown_subchannel_easy(struct subchannel_id schid, void *data) |
f97a56fb CH |
926 | { |
927 | struct schib schib; | |
928 | ||
a45e1414 | 929 | if (stsch_reset(schid, &schib)) |
f97a56fb CH |
930 | return -ENXIO; |
931 | if (!schib.pmcw.ena) | |
932 | return 0; | |
933 | switch(__disable_subchannel_easy(schid, &schib)) { | |
934 | case 0: | |
935 | case -ENODEV: | |
936 | break; | |
937 | default: /* -EBUSY */ | |
938 | if (__clear_subchannel_easy(schid)) | |
939 | break; /* give up... */ | |
940 | stsch(schid, &schib); | |
941 | __disable_subchannel_easy(schid, &schib); | |
942 | } | |
943 | return 0; | |
944 | } | |
1da177e4 | 945 | |
15e9b586 HC |
946 | static atomic_t chpid_reset_count; |
947 | ||
948 | static void s390_reset_chpids_mcck_handler(void) | |
949 | { | |
950 | struct crw crw; | |
951 | struct mci *mci; | |
952 | ||
953 | /* Check for pending channel report word. */ | |
954 | mci = (struct mci *)&S390_lowcore.mcck_interruption_code; | |
955 | if (!mci->cp) | |
956 | return; | |
957 | /* Process channel report words. */ | |
958 | while (stcrw(&crw) == 0) { | |
959 | /* Check for responses to RCHP. */ | |
960 | if (crw.slct && crw.rsc == CRW_RSC_CPATH) | |
961 | atomic_dec(&chpid_reset_count); | |
962 | } | |
963 | } | |
964 | ||
965 | #define RCHP_TIMEOUT (30 * USEC_PER_SEC) | |
966 | static void css_reset(void) | |
967 | { | |
968 | int i, ret; | |
969 | unsigned long long timeout; | |
f86635fa | 970 | struct chp_id chpid; |
15e9b586 HC |
971 | |
972 | /* Reset subchannels. */ | |
973 | for_each_subchannel(__shutdown_subchannel_easy, NULL); | |
974 | /* Reset channel paths. */ | |
ab14de6c | 975 | s390_base_mcck_handler_fn = s390_reset_chpids_mcck_handler; |
15e9b586 HC |
976 | /* Enable channel report machine checks. */ |
977 | __ctl_set_bit(14, 28); | |
978 | /* Temporarily reenable machine checks. */ | |
979 | local_mcck_enable(); | |
f86635fa | 980 | chp_id_init(&chpid); |
15e9b586 | 981 | for (i = 0; i <= __MAX_CHPID; i++) { |
f86635fa PO |
982 | chpid.id = i; |
983 | ret = rchp(chpid); | |
15e9b586 HC |
984 | if ((ret == 0) || (ret == 2)) |
985 | /* | |
986 | * rchp either succeeded, or another rchp is already | |
987 | * in progress. In either case, we'll get a crw. | |
988 | */ | |
989 | atomic_inc(&chpid_reset_count); | |
990 | } | |
991 | /* Wait for machine check for all channel paths. */ | |
992 | timeout = get_clock() + (RCHP_TIMEOUT << 12); | |
993 | while (atomic_read(&chpid_reset_count) != 0) { | |
994 | if (get_clock() > timeout) | |
995 | break; | |
996 | cpu_relax(); | |
997 | } | |
998 | /* Disable machine checks again. */ | |
999 | local_mcck_disable(); | |
1000 | /* Disable channel report machine checks. */ | |
1001 | __ctl_clear_bit(14, 28); | |
ab14de6c | 1002 | s390_base_mcck_handler_fn = NULL; |
15e9b586 HC |
1003 | } |
1004 | ||
1005 | static struct reset_call css_reset_call = { | |
1006 | .fn = css_reset, | |
1007 | }; | |
1008 | ||
1009 | static int __init init_css_reset_call(void) | |
1010 | { | |
1011 | atomic_set(&chpid_reset_count, 0); | |
1012 | register_reset_call(&css_reset_call); | |
1013 | return 0; | |
1014 | } | |
1015 | ||
1016 | arch_initcall(init_css_reset_call); | |
1017 | ||
1018 | struct sch_match_id { | |
1019 | struct subchannel_id schid; | |
1020 | struct ccw_dev_id devid; | |
1021 | int rc; | |
1022 | }; | |
1023 | ||
1024 | static int __reipl_subchannel_match(struct subchannel_id schid, void *data) | |
1025 | { | |
1026 | struct schib schib; | |
1027 | struct sch_match_id *match_id = data; | |
1028 | ||
a45e1414 | 1029 | if (stsch_reset(schid, &schib)) |
15e9b586 | 1030 | return -ENXIO; |
b279a4f5 | 1031 | if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv && |
15e9b586 HC |
1032 | (schib.pmcw.dev == match_id->devid.devno) && |
1033 | (schid.ssid == match_id->devid.ssid)) { | |
1034 | match_id->schid = schid; | |
1035 | match_id->rc = 0; | |
1036 | return 1; | |
1037 | } | |
1038 | return 0; | |
1039 | } | |
1040 | ||
1041 | static int reipl_find_schid(struct ccw_dev_id *devid, | |
1042 | struct subchannel_id *schid) | |
1da177e4 | 1043 | { |
ff6b8ea6 MH |
1044 | struct sch_match_id match_id; |
1045 | ||
1046 | match_id.devid = *devid; | |
1047 | match_id.rc = -ENODEV; | |
15e9b586 | 1048 | for_each_subchannel(__reipl_subchannel_match, &match_id); |
ff6b8ea6 MH |
1049 | if (match_id.rc == 0) |
1050 | *schid = match_id.schid; | |
1051 | return match_id.rc; | |
1da177e4 LT |
1052 | } |
1053 | ||
ff6b8ea6 MH |
1054 | extern void do_reipl_asm(__u32 schid); |
1055 | ||
1da177e4 | 1056 | /* Make sure all subchannels are quiet before we re-ipl an lpar. */ |
ff6b8ea6 | 1057 | void reipl_ccw_dev(struct ccw_dev_id *devid) |
1da177e4 | 1058 | { |
ff6b8ea6 MH |
1059 | struct subchannel_id schid; |
1060 | ||
15e9b586 HC |
1061 | s390_reset_system(); |
1062 | if (reipl_find_schid(devid, &schid) != 0) | |
ff6b8ea6 | 1063 | panic("IPL Device not found\n"); |
ff6b8ea6 | 1064 | do_reipl_asm(*((__u32*)&schid)); |
1da177e4 | 1065 | } |
e87bfe51 | 1066 | |
6fc321fd | 1067 | int __init cio_get_iplinfo(struct cio_iplinfo *iplinfo) |
e87bfe51 HC |
1068 | { |
1069 | struct subchannel_id schid; | |
6fc321fd | 1070 | struct schib schib; |
e87bfe51 HC |
1071 | |
1072 | schid = *(struct subchannel_id *)__LC_SUBCHANNEL_ID; | |
1073 | if (!schid.one) | |
6fc321fd HC |
1074 | return -ENODEV; |
1075 | if (stsch(schid, &schib)) | |
1076 | return -ENODEV; | |
b279a4f5 CH |
1077 | if (schib.pmcw.st != SUBCHANNEL_TYPE_IO) |
1078 | return -ENODEV; | |
6fc321fd HC |
1079 | if (!schib.pmcw.dnv) |
1080 | return -ENODEV; | |
1081 | iplinfo->devno = schib.pmcw.dev; | |
1082 | iplinfo->is_qdio = schib.pmcw.qf; | |
1083 | return 0; | |
e87bfe51 | 1084 | } |