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 | ||
b3a686f4 | 501 | static int cio_check_devno_blacklisted(struct subchannel *sch) |
0ae7a7b2 | 502 | { |
0ae7a7b2 CH |
503 | if (is_blacklisted(sch->schid.ssid, sch->schib.pmcw.dev)) { |
504 | /* | |
505 | * This device must not be known to Linux. So we simply | |
506 | * say that there is no device and return ENODEV. | |
507 | */ | |
508 | CIO_MSG_EVENT(6, "Blacklisted device detected " | |
509 | "at devno %04X, subchannel set %x\n", | |
510 | sch->schib.pmcw.dev, sch->schid.ssid); | |
511 | return -ENODEV; | |
512 | } | |
513 | return 0; | |
514 | } | |
515 | ||
b3a686f4 CH |
516 | static int cio_validate_io_subchannel(struct subchannel *sch) |
517 | { | |
518 | /* Initialization for io subchannels. */ | |
519 | if (!css_sch_is_valid(&sch->schib)) | |
520 | return -ENODEV; | |
521 | ||
522 | /* Devno is valid. */ | |
523 | return cio_check_devno_blacklisted(sch); | |
524 | } | |
525 | ||
526 | static int cio_validate_msg_subchannel(struct subchannel *sch) | |
527 | { | |
528 | /* Initialization for message subchannels. */ | |
529 | if (!css_sch_is_valid(&sch->schib)) | |
530 | return -ENODEV; | |
531 | ||
532 | /* Devno is valid. */ | |
533 | return cio_check_devno_blacklisted(sch); | |
534 | } | |
535 | ||
0ae7a7b2 CH |
536 | /** |
537 | * cio_validate_subchannel - basic validation of subchannel | |
538 | * @sch: subchannel structure to be filled out | |
539 | * @schid: subchannel id | |
1da177e4 LT |
540 | * |
541 | * Find out subchannel type and initialize struct subchannel. | |
542 | * Return codes: | |
0ae7a7b2 | 543 | * 0 on success |
1da177e4 | 544 | * -ENXIO for non-defined subchannels |
0ae7a7b2 CH |
545 | * -ENODEV for invalid subchannels or blacklisted devices |
546 | * -EIO for subchannels in an invalid subchannel set | |
1da177e4 | 547 | */ |
0ae7a7b2 | 548 | int cio_validate_subchannel(struct subchannel *sch, struct subchannel_id schid) |
1da177e4 LT |
549 | { |
550 | char dbf_txt[15]; | |
551 | int ccode; | |
2ec22984 | 552 | int err; |
1da177e4 | 553 | |
0ae7a7b2 CH |
554 | sprintf(dbf_txt, "valsch%x", schid.sch_no); |
555 | CIO_TRACE_EVENT(4, dbf_txt); | |
1da177e4 LT |
556 | |
557 | /* Nuke all fields. */ | |
558 | memset(sch, 0, sizeof(struct subchannel)); | |
559 | ||
2ec22984 CH |
560 | sch->schid = schid; |
561 | if (cio_is_console(schid)) { | |
562 | sch->lock = cio_get_console_lock(); | |
563 | } else { | |
564 | err = cio_create_sch_lock(sch); | |
565 | if (err) | |
566 | goto out; | |
567 | } | |
6ab4879a | 568 | mutex_init(&sch->reg_mutex); |
1da177e4 | 569 | /* Set a name for the subchannel */ |
fb6958a5 CH |
570 | snprintf (sch->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x", schid.ssid, |
571 | schid.sch_no); | |
1da177e4 LT |
572 | |
573 | /* | |
574 | * The first subchannel that is not-operational (ccode==3) | |
575 | * indicates that there aren't any more devices available. | |
fb6958a5 CH |
576 | * If stsch gets an exception, it means the current subchannel set |
577 | * is not valid. | |
1da177e4 | 578 | */ |
fb6958a5 | 579 | ccode = stsch_err (schid, &sch->schib); |
2ec22984 CH |
580 | if (ccode) { |
581 | err = (ccode == 3) ? -ENXIO : ccode; | |
582 | goto out; | |
583 | } | |
1da177e4 LT |
584 | /* Copy subchannel type from path management control word. */ |
585 | sch->st = sch->schib.pmcw.st; | |
c820de39 | 586 | |
0ae7a7b2 CH |
587 | switch (sch->st) { |
588 | case SUBCHANNEL_TYPE_IO: | |
589 | err = cio_validate_io_subchannel(sch); | |
590 | break; | |
b3a686f4 CH |
591 | case SUBCHANNEL_TYPE_MSG: |
592 | err = cio_validate_msg_subchannel(sch); | |
593 | break; | |
0ae7a7b2 CH |
594 | default: |
595 | err = 0; | |
1da177e4 | 596 | } |
0ae7a7b2 | 597 | if (err) |
808e4888 | 598 | goto out; |
808e4888 | 599 | |
0ae7a7b2 CH |
600 | CIO_MSG_EVENT(4, "Subchannel 0.%x.%04x reports subchannel type %04X\n", |
601 | sch->schid.ssid, sch->schid.sch_no, sch->st); | |
1da177e4 | 602 | return 0; |
2ec22984 CH |
603 | out: |
604 | if (!cio_is_console(schid)) | |
605 | kfree(sch->lock); | |
606 | sch->lock = NULL; | |
607 | return err; | |
1da177e4 LT |
608 | } |
609 | ||
610 | /* | |
611 | * do_IRQ() handles all normal I/O device IRQ's (the special | |
612 | * SMP cross-CPU interrupts have their own specific | |
613 | * handlers). | |
614 | * | |
615 | */ | |
616 | void | |
617 | do_IRQ (struct pt_regs *regs) | |
618 | { | |
619 | struct tpi_info *tpi_info; | |
620 | struct subchannel *sch; | |
621 | struct irb *irb; | |
5a489b98 | 622 | struct pt_regs *old_regs; |
1da177e4 | 623 | |
5a489b98 | 624 | old_regs = set_irq_regs(regs); |
9d0a57cb | 625 | irq_enter(); |
43ca5c3a | 626 | s390_idle_check(); |
5a62b192 HC |
627 | if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator) |
628 | /* Serve timer interrupts first. */ | |
629 | clock_comparator_work(); | |
1da177e4 LT |
630 | /* |
631 | * Get interrupt information from lowcore | |
632 | */ | |
633 | tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID; | |
634 | irb = (struct irb *) __LC_IRB; | |
635 | do { | |
636 | kstat_cpu(smp_processor_id()).irqs[IO_INTERRUPT]++; | |
637 | /* | |
638 | * Non I/O-subchannel thin interrupts are processed differently | |
639 | */ | |
640 | if (tpi_info->adapter_IO == 1 && | |
641 | tpi_info->int_type == IO_INTERRUPT_TYPE) { | |
642 | do_adapter_IO(); | |
643 | continue; | |
644 | } | |
645 | sch = (struct subchannel *)(unsigned long)tpi_info->intparm; | |
a806170e HC |
646 | if (!sch) { |
647 | /* Clear pending interrupt condition. */ | |
648 | tsch(tpi_info->schid, irb); | |
649 | continue; | |
650 | } | |
651 | spin_lock(sch->lock); | |
1da177e4 | 652 | /* Store interrupt response block to lowcore. */ |
a806170e | 653 | if (tsch(tpi_info->schid, irb) == 0) { |
1da177e4 LT |
654 | /* Keep subchannel information word up to date. */ |
655 | memcpy (&sch->schib.scsw, &irb->scsw, | |
656 | sizeof (irb->scsw)); | |
657 | /* Call interrupt handler if there is one. */ | |
658 | if (sch->driver && sch->driver->irq) | |
602b20f2 | 659 | sch->driver->irq(sch); |
1da177e4 | 660 | } |
a806170e | 661 | spin_unlock(sch->lock); |
1da177e4 LT |
662 | /* |
663 | * Are more interrupts pending? | |
664 | * If so, the tpi instruction will update the lowcore | |
665 | * to hold the info for the next interrupt. | |
666 | * We don't do this for VM because a tpi drops the cpu | |
667 | * out of the sie which costs more cycles than it saves. | |
668 | */ | |
669 | } while (!MACHINE_IS_VM && tpi (NULL) != 0); | |
9d0a57cb | 670 | irq_exit(); |
5a489b98 | 671 | set_irq_regs(old_regs); |
1da177e4 LT |
672 | } |
673 | ||
674 | #ifdef CONFIG_CCW_CONSOLE | |
675 | static struct subchannel console_subchannel; | |
cd6b4f27 | 676 | static struct io_subchannel_private console_priv; |
1da177e4 LT |
677 | static int console_subchannel_in_use; |
678 | ||
cd6b4f27 CH |
679 | void *cio_get_console_priv(void) |
680 | { | |
681 | return &console_priv; | |
682 | } | |
683 | ||
1da177e4 LT |
684 | /* |
685 | * busy wait for the next interrupt on the console | |
686 | */ | |
a806170e HC |
687 | void wait_cons_dev(void) |
688 | __releases(console_subchannel.lock) | |
689 | __acquires(console_subchannel.lock) | |
1da177e4 LT |
690 | { |
691 | unsigned long cr6 __attribute__ ((aligned (8))); | |
692 | unsigned long save_cr6 __attribute__ ((aligned (8))); | |
693 | ||
694 | /* | |
695 | * before entering the spinlock we may already have | |
696 | * processed the interrupt on a different CPU... | |
697 | */ | |
698 | if (!console_subchannel_in_use) | |
699 | return; | |
700 | ||
85b0d7c0 | 701 | /* disable all but isc 1 (console device) */ |
1da177e4 | 702 | __ctl_store (save_cr6, 6, 6); |
85b0d7c0 | 703 | cr6 = 0x40000000; |
1da177e4 LT |
704 | __ctl_load (cr6, 6, 6); |
705 | ||
706 | do { | |
2ec22984 | 707 | spin_unlock(console_subchannel.lock); |
1da177e4 LT |
708 | if (!cio_tpi()) |
709 | cpu_relax(); | |
2ec22984 | 710 | spin_lock(console_subchannel.lock); |
1da177e4 LT |
711 | } while (console_subchannel.schib.scsw.actl != 0); |
712 | /* | |
713 | * restore previous isc value | |
714 | */ | |
715 | __ctl_load (save_cr6, 6, 6); | |
716 | } | |
717 | ||
718 | static int | |
f97a56fb CH |
719 | cio_test_for_console(struct subchannel_id schid, void *data) |
720 | { | |
fb6958a5 | 721 | if (stsch_err(schid, &console_subchannel.schib) != 0) |
f97a56fb | 722 | return -ENXIO; |
b279a4f5 CH |
723 | if ((console_subchannel.schib.pmcw.st == SUBCHANNEL_TYPE_IO) && |
724 | console_subchannel.schib.pmcw.dnv && | |
725 | (console_subchannel.schib.pmcw.dev == console_devno)) { | |
f97a56fb CH |
726 | console_irq = schid.sch_no; |
727 | return 1; /* found */ | |
728 | } | |
729 | return 0; | |
730 | } | |
731 | ||
732 | ||
733 | static int | |
734 | cio_get_console_sch_no(void) | |
1da177e4 | 735 | { |
a8237fc4 | 736 | struct subchannel_id schid; |
1da177e4 | 737 | |
a8237fc4 | 738 | init_subchannel_id(&schid); |
1da177e4 LT |
739 | if (console_irq != -1) { |
740 | /* VM provided us with the irq number of the console. */ | |
a8237fc4 CH |
741 | schid.sch_no = console_irq; |
742 | if (stsch(schid, &console_subchannel.schib) != 0 || | |
b279a4f5 | 743 | (console_subchannel.schib.pmcw.st != SUBCHANNEL_TYPE_IO) || |
1da177e4 LT |
744 | !console_subchannel.schib.pmcw.dnv) |
745 | return -1; | |
746 | console_devno = console_subchannel.schib.pmcw.dev; | |
747 | } else if (console_devno != -1) { | |
748 | /* At least the console device number is known. */ | |
f97a56fb | 749 | for_each_subchannel(cio_test_for_console, NULL); |
1da177e4 LT |
750 | if (console_irq == -1) |
751 | return -1; | |
752 | } else { | |
753 | /* unlike in 2.4, we cannot autoprobe here, since | |
754 | * the channel subsystem is not fully initialized. | |
755 | * With some luck, the HWC console can take over */ | |
e556bbbd | 756 | printk(KERN_WARNING "cio: No ccw console found!\n"); |
1da177e4 LT |
757 | return -1; |
758 | } | |
759 | return console_irq; | |
760 | } | |
761 | ||
762 | struct subchannel * | |
763 | cio_probe_console(void) | |
764 | { | |
f97a56fb | 765 | int sch_no, ret; |
a8237fc4 | 766 | struct subchannel_id schid; |
1da177e4 LT |
767 | |
768 | if (xchg(&console_subchannel_in_use, 1) != 0) | |
769 | return ERR_PTR(-EBUSY); | |
f97a56fb CH |
770 | sch_no = cio_get_console_sch_no(); |
771 | if (sch_no == -1) { | |
1da177e4 LT |
772 | console_subchannel_in_use = 0; |
773 | return ERR_PTR(-ENODEV); | |
774 | } | |
775 | memset(&console_subchannel, 0, sizeof(struct subchannel)); | |
a8237fc4 | 776 | init_subchannel_id(&schid); |
f97a56fb | 777 | schid.sch_no = sch_no; |
a8237fc4 | 778 | ret = cio_validate_subchannel(&console_subchannel, schid); |
1da177e4 LT |
779 | if (ret) { |
780 | console_subchannel_in_use = 0; | |
781 | return ERR_PTR(-ENODEV); | |
782 | } | |
783 | ||
784 | /* | |
85b0d7c0 | 785 | * enable console I/O-interrupt subclass 1 |
1da177e4 | 786 | */ |
85b0d7c0 | 787 | ctl_set_bit(6, 30); |
85b0d7c0 | 788 | console_subchannel.schib.pmcw.isc = 1; |
1da177e4 | 789 | console_subchannel.schib.pmcw.intparm = |
cd6b4f27 | 790 | (u32)(addr_t)&console_subchannel; |
1da177e4 LT |
791 | ret = cio_modify(&console_subchannel); |
792 | if (ret) { | |
793 | console_subchannel_in_use = 0; | |
794 | return ERR_PTR(ret); | |
795 | } | |
796 | return &console_subchannel; | |
797 | } | |
798 | ||
799 | void | |
800 | cio_release_console(void) | |
801 | { | |
802 | console_subchannel.schib.pmcw.intparm = 0; | |
803 | cio_modify(&console_subchannel); | |
9689b336 | 804 | ctl_clear_bit(6, 30); |
1da177e4 LT |
805 | console_subchannel_in_use = 0; |
806 | } | |
807 | ||
808 | /* Bah... hack to catch console special sausages. */ | |
809 | int | |
a8237fc4 | 810 | cio_is_console(struct subchannel_id schid) |
1da177e4 LT |
811 | { |
812 | if (!console_subchannel_in_use) | |
813 | return 0; | |
a8237fc4 | 814 | return schid_equal(&schid, &console_subchannel.schid); |
1da177e4 LT |
815 | } |
816 | ||
817 | struct subchannel * | |
818 | cio_get_console_subchannel(void) | |
819 | { | |
820 | if (!console_subchannel_in_use) | |
d2c993d8 | 821 | return NULL; |
1da177e4 LT |
822 | return &console_subchannel; |
823 | } | |
824 | ||
825 | #endif | |
4d284cac | 826 | static int |
a8237fc4 | 827 | __disable_subchannel_easy(struct subchannel_id schid, struct schib *schib) |
1da177e4 LT |
828 | { |
829 | int retry, cc; | |
830 | ||
831 | cc = 0; | |
832 | for (retry=0;retry<3;retry++) { | |
833 | schib->pmcw.ena = 0; | |
834 | cc = msch(schid, schib); | |
835 | if (cc) | |
836 | return (cc==3?-ENODEV:-EBUSY); | |
837 | stsch(schid, schib); | |
838 | if (!schib->pmcw.ena) | |
839 | return 0; | |
840 | } | |
841 | return -EBUSY; /* uhm... */ | |
842 | } | |
843 | ||
d54853ef MS |
844 | /* we can't use the normal udelay here, since it enables external interrupts */ |
845 | ||
846 | static void udelay_reset(unsigned long usecs) | |
847 | { | |
848 | uint64_t start_cc, end_cc; | |
849 | ||
850 | asm volatile ("STCK %0" : "=m" (start_cc)); | |
851 | do { | |
852 | cpu_relax(); | |
853 | asm volatile ("STCK %0" : "=m" (end_cc)); | |
854 | } while (((end_cc - start_cc)/4096) < usecs); | |
855 | } | |
856 | ||
4d284cac | 857 | static int |
0ae7a7b2 | 858 | __clear_io_subchannel_easy(struct subchannel_id schid) |
1da177e4 LT |
859 | { |
860 | int retry; | |
861 | ||
862 | if (csch(schid)) | |
863 | return -ENODEV; | |
864 | for (retry=0;retry<20;retry++) { | |
865 | struct tpi_info ti; | |
866 | ||
867 | if (tpi(&ti)) { | |
a8237fc4 CH |
868 | tsch(ti.schid, (struct irb *)__LC_IRB); |
869 | if (schid_equal(&ti.schid, &schid)) | |
4c24da79 | 870 | return 0; |
1da177e4 | 871 | } |
d54853ef | 872 | udelay_reset(100); |
1da177e4 LT |
873 | } |
874 | return -EBUSY; | |
875 | } | |
876 | ||
a45e1414 MH |
877 | static int pgm_check_occured; |
878 | ||
879 | static void cio_reset_pgm_check_handler(void) | |
880 | { | |
881 | pgm_check_occured = 1; | |
882 | } | |
883 | ||
884 | static int stsch_reset(struct subchannel_id schid, volatile struct schib *addr) | |
885 | { | |
886 | int rc; | |
887 | ||
888 | pgm_check_occured = 0; | |
ab14de6c | 889 | s390_base_pgm_handler_fn = cio_reset_pgm_check_handler; |
6faf4444 | 890 | rc = stsch(schid, addr); |
ab14de6c | 891 | s390_base_pgm_handler_fn = NULL; |
aa77015c | 892 | |
ab14de6c | 893 | /* The program check handler could have changed pgm_check_occured. */ |
6faf4444 | 894 | barrier(); |
aa77015c | 895 | |
a45e1414 MH |
896 | if (pgm_check_occured) |
897 | return -EIO; | |
898 | else | |
899 | return rc; | |
900 | } | |
901 | ||
15e9b586 | 902 | static int __shutdown_subchannel_easy(struct subchannel_id schid, void *data) |
f97a56fb CH |
903 | { |
904 | struct schib schib; | |
905 | ||
a45e1414 | 906 | if (stsch_reset(schid, &schib)) |
f97a56fb CH |
907 | return -ENXIO; |
908 | if (!schib.pmcw.ena) | |
909 | return 0; | |
910 | switch(__disable_subchannel_easy(schid, &schib)) { | |
911 | case 0: | |
912 | case -ENODEV: | |
913 | break; | |
914 | default: /* -EBUSY */ | |
0ae7a7b2 CH |
915 | switch (schib.pmcw.st) { |
916 | case SUBCHANNEL_TYPE_IO: | |
917 | if (__clear_io_subchannel_easy(schid)) | |
918 | goto out; /* give up... */ | |
919 | break; | |
920 | default: | |
921 | /* No default clear strategy */ | |
922 | break; | |
923 | } | |
f97a56fb CH |
924 | stsch(schid, &schib); |
925 | __disable_subchannel_easy(schid, &schib); | |
926 | } | |
0ae7a7b2 | 927 | out: |
f97a56fb CH |
928 | return 0; |
929 | } | |
1da177e4 | 930 | |
15e9b586 HC |
931 | static atomic_t chpid_reset_count; |
932 | ||
933 | static void s390_reset_chpids_mcck_handler(void) | |
934 | { | |
935 | struct crw crw; | |
936 | struct mci *mci; | |
937 | ||
938 | /* Check for pending channel report word. */ | |
939 | mci = (struct mci *)&S390_lowcore.mcck_interruption_code; | |
940 | if (!mci->cp) | |
941 | return; | |
942 | /* Process channel report words. */ | |
943 | while (stcrw(&crw) == 0) { | |
944 | /* Check for responses to RCHP. */ | |
945 | if (crw.slct && crw.rsc == CRW_RSC_CPATH) | |
946 | atomic_dec(&chpid_reset_count); | |
947 | } | |
948 | } | |
949 | ||
950 | #define RCHP_TIMEOUT (30 * USEC_PER_SEC) | |
951 | static void css_reset(void) | |
952 | { | |
953 | int i, ret; | |
954 | unsigned long long timeout; | |
f86635fa | 955 | struct chp_id chpid; |
15e9b586 HC |
956 | |
957 | /* Reset subchannels. */ | |
958 | for_each_subchannel(__shutdown_subchannel_easy, NULL); | |
959 | /* Reset channel paths. */ | |
ab14de6c | 960 | s390_base_mcck_handler_fn = s390_reset_chpids_mcck_handler; |
15e9b586 HC |
961 | /* Enable channel report machine checks. */ |
962 | __ctl_set_bit(14, 28); | |
963 | /* Temporarily reenable machine checks. */ | |
964 | local_mcck_enable(); | |
f86635fa | 965 | chp_id_init(&chpid); |
15e9b586 | 966 | for (i = 0; i <= __MAX_CHPID; i++) { |
f86635fa PO |
967 | chpid.id = i; |
968 | ret = rchp(chpid); | |
15e9b586 HC |
969 | if ((ret == 0) || (ret == 2)) |
970 | /* | |
971 | * rchp either succeeded, or another rchp is already | |
972 | * in progress. In either case, we'll get a crw. | |
973 | */ | |
974 | atomic_inc(&chpid_reset_count); | |
975 | } | |
976 | /* Wait for machine check for all channel paths. */ | |
977 | timeout = get_clock() + (RCHP_TIMEOUT << 12); | |
978 | while (atomic_read(&chpid_reset_count) != 0) { | |
979 | if (get_clock() > timeout) | |
980 | break; | |
981 | cpu_relax(); | |
982 | } | |
983 | /* Disable machine checks again. */ | |
984 | local_mcck_disable(); | |
985 | /* Disable channel report machine checks. */ | |
986 | __ctl_clear_bit(14, 28); | |
ab14de6c | 987 | s390_base_mcck_handler_fn = NULL; |
15e9b586 HC |
988 | } |
989 | ||
990 | static struct reset_call css_reset_call = { | |
991 | .fn = css_reset, | |
992 | }; | |
993 | ||
994 | static int __init init_css_reset_call(void) | |
995 | { | |
996 | atomic_set(&chpid_reset_count, 0); | |
997 | register_reset_call(&css_reset_call); | |
998 | return 0; | |
999 | } | |
1000 | ||
1001 | arch_initcall(init_css_reset_call); | |
1002 | ||
1003 | struct sch_match_id { | |
1004 | struct subchannel_id schid; | |
1005 | struct ccw_dev_id devid; | |
1006 | int rc; | |
1007 | }; | |
1008 | ||
1009 | static int __reipl_subchannel_match(struct subchannel_id schid, void *data) | |
1010 | { | |
1011 | struct schib schib; | |
1012 | struct sch_match_id *match_id = data; | |
1013 | ||
a45e1414 | 1014 | if (stsch_reset(schid, &schib)) |
15e9b586 | 1015 | return -ENXIO; |
b279a4f5 | 1016 | if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv && |
15e9b586 HC |
1017 | (schib.pmcw.dev == match_id->devid.devno) && |
1018 | (schid.ssid == match_id->devid.ssid)) { | |
1019 | match_id->schid = schid; | |
1020 | match_id->rc = 0; | |
1021 | return 1; | |
1022 | } | |
1023 | return 0; | |
1024 | } | |
1025 | ||
1026 | static int reipl_find_schid(struct ccw_dev_id *devid, | |
1027 | struct subchannel_id *schid) | |
1da177e4 | 1028 | { |
ff6b8ea6 MH |
1029 | struct sch_match_id match_id; |
1030 | ||
1031 | match_id.devid = *devid; | |
1032 | match_id.rc = -ENODEV; | |
15e9b586 | 1033 | for_each_subchannel(__reipl_subchannel_match, &match_id); |
ff6b8ea6 MH |
1034 | if (match_id.rc == 0) |
1035 | *schid = match_id.schid; | |
1036 | return match_id.rc; | |
1da177e4 LT |
1037 | } |
1038 | ||
ff6b8ea6 MH |
1039 | extern void do_reipl_asm(__u32 schid); |
1040 | ||
1da177e4 | 1041 | /* Make sure all subchannels are quiet before we re-ipl an lpar. */ |
ff6b8ea6 | 1042 | void reipl_ccw_dev(struct ccw_dev_id *devid) |
1da177e4 | 1043 | { |
ff6b8ea6 MH |
1044 | struct subchannel_id schid; |
1045 | ||
15e9b586 HC |
1046 | s390_reset_system(); |
1047 | if (reipl_find_schid(devid, &schid) != 0) | |
ff6b8ea6 | 1048 | panic("IPL Device not found\n"); |
ff6b8ea6 | 1049 | do_reipl_asm(*((__u32*)&schid)); |
1da177e4 | 1050 | } |
e87bfe51 | 1051 | |
6fc321fd | 1052 | int __init cio_get_iplinfo(struct cio_iplinfo *iplinfo) |
e87bfe51 HC |
1053 | { |
1054 | struct subchannel_id schid; | |
6fc321fd | 1055 | struct schib schib; |
e87bfe51 HC |
1056 | |
1057 | schid = *(struct subchannel_id *)__LC_SUBCHANNEL_ID; | |
1058 | if (!schid.one) | |
6fc321fd HC |
1059 | return -ENODEV; |
1060 | if (stsch(schid, &schib)) | |
1061 | return -ENODEV; | |
b279a4f5 CH |
1062 | if (schib.pmcw.st != SUBCHANNEL_TYPE_IO) |
1063 | return -ENODEV; | |
6fc321fd HC |
1064 | if (!schib.pmcw.dnv) |
1065 | return -ENODEV; | |
1066 | iplinfo->devno = schib.pmcw.dev; | |
1067 | iplinfo->is_qdio = schib.pmcw.qf; | |
1068 | return 0; | |
e87bfe51 | 1069 | } |