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> |
3a3fc29a | 27 | #include <asm/isc.h> |
43ca5c3a | 28 | #include <asm/cpu.h> |
83262d63 | 29 | #include <asm/fcx.h> |
1da177e4 LT |
30 | #include "cio.h" |
31 | #include "css.h" | |
32 | #include "chsc.h" | |
33 | #include "ioasm.h" | |
cd6b4f27 | 34 | #include "io_sch.h" |
1da177e4 LT |
35 | #include "blacklist.h" |
36 | #include "cio_debug.h" | |
e6b6e10a | 37 | #include "chp.h" |
15e9b586 | 38 | #include "../s390mach.h" |
1da177e4 LT |
39 | |
40 | debug_info_t *cio_debug_msg_id; | |
41 | debug_info_t *cio_debug_trace_id; | |
42 | debug_info_t *cio_debug_crw_id; | |
43 | ||
1da177e4 LT |
44 | /* |
45 | * Function: cio_debug_init | |
bc698bcf CH |
46 | * Initializes three debug logs for common I/O: |
47 | * - cio_msg logs generic cio messages | |
1da177e4 | 48 | * - cio_trace logs the calling of different functions |
bc698bcf | 49 | * - cio_crw logs machine check related cio messages |
1da177e4 | 50 | */ |
bc698bcf | 51 | static int __init cio_debug_init(void) |
1da177e4 | 52 | { |
361f494d | 53 | cio_debug_msg_id = debug_register("cio_msg", 16, 1, 16 * sizeof(long)); |
1da177e4 LT |
54 | if (!cio_debug_msg_id) |
55 | goto out_unregister; | |
bc698bcf CH |
56 | debug_register_view(cio_debug_msg_id, &debug_sprintf_view); |
57 | debug_set_level(cio_debug_msg_id, 2); | |
361f494d | 58 | cio_debug_trace_id = debug_register("cio_trace", 16, 1, 16); |
1da177e4 LT |
59 | if (!cio_debug_trace_id) |
60 | goto out_unregister; | |
bc698bcf CH |
61 | debug_register_view(cio_debug_trace_id, &debug_hex_ascii_view); |
62 | debug_set_level(cio_debug_trace_id, 2); | |
361f494d | 63 | cio_debug_crw_id = debug_register("cio_crw", 16, 1, 16 * sizeof(long)); |
1da177e4 LT |
64 | if (!cio_debug_crw_id) |
65 | goto out_unregister; | |
bc698bcf CH |
66 | debug_register_view(cio_debug_crw_id, &debug_sprintf_view); |
67 | debug_set_level(cio_debug_crw_id, 4); | |
1da177e4 LT |
68 | return 0; |
69 | ||
70 | out_unregister: | |
71 | if (cio_debug_msg_id) | |
bc698bcf | 72 | debug_unregister(cio_debug_msg_id); |
1da177e4 | 73 | if (cio_debug_trace_id) |
bc698bcf | 74 | debug_unregister(cio_debug_trace_id); |
1da177e4 | 75 | if (cio_debug_crw_id) |
bc698bcf | 76 | debug_unregister(cio_debug_crw_id); |
1da177e4 LT |
77 | return -1; |
78 | } | |
79 | ||
80 | arch_initcall (cio_debug_init); | |
81 | ||
82 | int | |
83 | cio_set_options (struct subchannel *sch, int flags) | |
84 | { | |
85 | sch->options.suspend = (flags & DOIO_ALLOW_SUSPEND) != 0; | |
86 | sch->options.prefetch = (flags & DOIO_DENY_PREFETCH) != 0; | |
87 | sch->options.inter = (flags & DOIO_SUPPRESS_INTER) != 0; | |
88 | return 0; | |
89 | } | |
90 | ||
91 | /* FIXME: who wants to use this? */ | |
92 | int | |
93 | cio_get_options (struct subchannel *sch) | |
94 | { | |
95 | int flags; | |
96 | ||
97 | flags = 0; | |
98 | if (sch->options.suspend) | |
99 | flags |= DOIO_ALLOW_SUSPEND; | |
100 | if (sch->options.prefetch) | |
101 | flags |= DOIO_DENY_PREFETCH; | |
102 | if (sch->options.inter) | |
103 | flags |= DOIO_SUPPRESS_INTER; | |
104 | return flags; | |
105 | } | |
106 | ||
4d284cac | 107 | static int |
1da177e4 LT |
108 | cio_start_handle_notoper(struct subchannel *sch, __u8 lpm) |
109 | { | |
110 | char dbf_text[15]; | |
111 | ||
112 | if (lpm != 0) | |
113 | sch->lpm &= ~lpm; | |
114 | else | |
115 | sch->lpm = 0; | |
116 | ||
139b83dd | 117 | CIO_MSG_EVENT(2, "cio_start: 'not oper' status for " |
fb6958a5 CH |
118 | "subchannel 0.%x.%04x!\n", sch->schid.ssid, |
119 | sch->schid.sch_no); | |
cdb912a4 SO |
120 | |
121 | if (cio_update_schib(sch)) | |
122 | return -ENODEV; | |
123 | ||
2a0217d5 | 124 | sprintf(dbf_text, "no%s", dev_name(&sch->dev)); |
1da177e4 LT |
125 | CIO_TRACE_EVENT(0, dbf_text); |
126 | CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib)); | |
127 | ||
128 | return (sch->lpm ? -EACCES : -ENODEV); | |
129 | } | |
130 | ||
131 | int | |
132 | cio_start_key (struct subchannel *sch, /* subchannel structure */ | |
133 | struct ccw1 * cpa, /* logical channel prog addr */ | |
134 | __u8 lpm, /* logical path mask */ | |
135 | __u8 key) /* storage key */ | |
136 | { | |
137 | char dbf_txt[15]; | |
138 | int ccode; | |
83262d63 | 139 | union orb *orb; |
1da177e4 | 140 | |
cd6b4f27 | 141 | CIO_TRACE_EVENT(4, "stIO"); |
2a0217d5 | 142 | CIO_TRACE_EVENT(4, dev_name(&sch->dev)); |
1da177e4 | 143 | |
cd6b4f27 | 144 | orb = &to_io_private(sch)->orb; |
9adb8c1d | 145 | memset(orb, 0, sizeof(union orb)); |
1da177e4 | 146 | /* sch is always under 2G. */ |
83262d63 PO |
147 | orb->cmd.intparm = (u32)(addr_t)sch; |
148 | orb->cmd.fmt = 1; | |
1da177e4 | 149 | |
83262d63 PO |
150 | orb->cmd.pfch = sch->options.prefetch == 0; |
151 | orb->cmd.spnd = sch->options.suspend; | |
152 | orb->cmd.ssic = sch->options.suspend && sch->options.inter; | |
153 | orb->cmd.lpm = (lpm != 0) ? lpm : sch->lpm; | |
347a8dc3 | 154 | #ifdef CONFIG_64BIT |
1da177e4 LT |
155 | /* |
156 | * for 64 bit we always support 64 bit IDAWs with 4k page size only | |
157 | */ | |
83262d63 PO |
158 | orb->cmd.c64 = 1; |
159 | orb->cmd.i2k = 0; | |
1da177e4 | 160 | #endif |
83262d63 | 161 | orb->cmd.key = key >> 4; |
1da177e4 | 162 | /* issue "Start Subchannel" */ |
83262d63 | 163 | orb->cmd.cpa = (__u32) __pa(cpa); |
cd6b4f27 | 164 | ccode = ssch(sch->schid, orb); |
1da177e4 LT |
165 | |
166 | /* process condition code */ | |
cd6b4f27 CH |
167 | sprintf(dbf_txt, "ccode:%d", ccode); |
168 | CIO_TRACE_EVENT(4, dbf_txt); | |
1da177e4 LT |
169 | |
170 | switch (ccode) { | |
171 | case 0: | |
172 | /* | |
173 | * initialize device status information | |
174 | */ | |
23d805b6 | 175 | sch->schib.scsw.cmd.actl |= SCSW_ACTL_START_PEND; |
1da177e4 LT |
176 | return 0; |
177 | case 1: /* status pending */ | |
178 | case 2: /* busy */ | |
179 | return -EBUSY; | |
c91ebe49 | 180 | case 3: /* device/path not operational */ |
1da177e4 | 181 | return cio_start_handle_notoper(sch, lpm); |
c91ebe49 CH |
182 | default: |
183 | return ccode; | |
1da177e4 LT |
184 | } |
185 | } | |
186 | ||
187 | int | |
188 | cio_start (struct subchannel *sch, struct ccw1 *cpa, __u8 lpm) | |
189 | { | |
0b642ede | 190 | return cio_start_key(sch, cpa, lpm, PAGE_DEFAULT_KEY); |
1da177e4 LT |
191 | } |
192 | ||
193 | /* | |
194 | * resume suspended I/O operation | |
195 | */ | |
196 | int | |
197 | cio_resume (struct subchannel *sch) | |
198 | { | |
199 | char dbf_txt[15]; | |
200 | int ccode; | |
201 | ||
202 | CIO_TRACE_EVENT (4, "resIO"); | |
2a0217d5 | 203 | CIO_TRACE_EVENT(4, dev_name(&sch->dev)); |
1da177e4 | 204 | |
a8237fc4 | 205 | ccode = rsch (sch->schid); |
1da177e4 LT |
206 | |
207 | sprintf (dbf_txt, "ccode:%d", ccode); | |
208 | CIO_TRACE_EVENT (4, dbf_txt); | |
209 | ||
210 | switch (ccode) { | |
211 | case 0: | |
23d805b6 | 212 | sch->schib.scsw.cmd.actl |= SCSW_ACTL_RESUME_PEND; |
1da177e4 LT |
213 | return 0; |
214 | case 1: | |
215 | return -EBUSY; | |
216 | case 2: | |
217 | return -EINVAL; | |
218 | default: | |
219 | /* | |
220 | * useless to wait for request completion | |
221 | * as device is no longer operational ! | |
222 | */ | |
223 | return -ENODEV; | |
224 | } | |
225 | } | |
226 | ||
227 | /* | |
228 | * halt I/O operation | |
229 | */ | |
230 | int | |
231 | cio_halt(struct subchannel *sch) | |
232 | { | |
233 | char dbf_txt[15]; | |
234 | int ccode; | |
235 | ||
236 | if (!sch) | |
237 | return -ENODEV; | |
238 | ||
239 | CIO_TRACE_EVENT (2, "haltIO"); | |
2a0217d5 | 240 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 LT |
241 | |
242 | /* | |
243 | * Issue "Halt subchannel" and process condition code | |
244 | */ | |
a8237fc4 | 245 | ccode = hsch (sch->schid); |
1da177e4 LT |
246 | |
247 | sprintf (dbf_txt, "ccode:%d", ccode); | |
248 | CIO_TRACE_EVENT (2, dbf_txt); | |
249 | ||
250 | switch (ccode) { | |
251 | case 0: | |
23d805b6 | 252 | sch->schib.scsw.cmd.actl |= SCSW_ACTL_HALT_PEND; |
1da177e4 LT |
253 | return 0; |
254 | case 1: /* status pending */ | |
255 | case 2: /* busy */ | |
256 | return -EBUSY; | |
257 | default: /* device not operational */ | |
258 | return -ENODEV; | |
259 | } | |
260 | } | |
261 | ||
262 | /* | |
263 | * Clear I/O operation | |
264 | */ | |
265 | int | |
266 | cio_clear(struct subchannel *sch) | |
267 | { | |
268 | char dbf_txt[15]; | |
269 | int ccode; | |
270 | ||
271 | if (!sch) | |
272 | return -ENODEV; | |
273 | ||
274 | CIO_TRACE_EVENT (2, "clearIO"); | |
2a0217d5 | 275 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 LT |
276 | |
277 | /* | |
278 | * Issue "Clear subchannel" and process condition code | |
279 | */ | |
a8237fc4 | 280 | ccode = csch (sch->schid); |
1da177e4 LT |
281 | |
282 | sprintf (dbf_txt, "ccode:%d", ccode); | |
283 | CIO_TRACE_EVENT (2, dbf_txt); | |
284 | ||
285 | switch (ccode) { | |
286 | case 0: | |
23d805b6 | 287 | sch->schib.scsw.cmd.actl |= SCSW_ACTL_CLEAR_PEND; |
1da177e4 LT |
288 | return 0; |
289 | default: /* device not operational */ | |
290 | return -ENODEV; | |
291 | } | |
292 | } | |
293 | ||
294 | /* | |
295 | * Function: cio_cancel | |
296 | * Issues a "Cancel Subchannel" on the specified subchannel | |
297 | * Note: We don't need any fancy intparms and flags here | |
298 | * since xsch is executed synchronously. | |
299 | * Only for common I/O internal use as for now. | |
300 | */ | |
301 | int | |
302 | cio_cancel (struct subchannel *sch) | |
303 | { | |
304 | char dbf_txt[15]; | |
305 | int ccode; | |
306 | ||
307 | if (!sch) | |
308 | return -ENODEV; | |
309 | ||
310 | CIO_TRACE_EVENT (2, "cancelIO"); | |
2a0217d5 | 311 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 | 312 | |
a8237fc4 | 313 | ccode = xsch (sch->schid); |
1da177e4 LT |
314 | |
315 | sprintf (dbf_txt, "ccode:%d", ccode); | |
316 | CIO_TRACE_EVENT (2, dbf_txt); | |
317 | ||
318 | switch (ccode) { | |
319 | case 0: /* success */ | |
320 | /* Update information in scsw. */ | |
cdb912a4 SO |
321 | if (cio_update_schib(sch)) |
322 | return -ENODEV; | |
1da177e4 LT |
323 | return 0; |
324 | case 1: /* status pending */ | |
325 | return -EBUSY; | |
326 | case 2: /* not applicable */ | |
327 | return -EINVAL; | |
328 | default: /* not oper */ | |
329 | return -ENODEV; | |
330 | } | |
331 | } | |
332 | ||
333 | /* | |
334 | * Function: cio_modify | |
335 | * Issues a "Modify Subchannel" on the specified subchannel | |
336 | */ | |
337 | int | |
338 | cio_modify (struct subchannel *sch) | |
339 | { | |
340 | int ccode, retry, ret; | |
341 | ||
342 | ret = 0; | |
343 | for (retry = 0; retry < 5; retry++) { | |
a8237fc4 | 344 | ccode = msch_err (sch->schid, &sch->schib); |
1da177e4 LT |
345 | if (ccode < 0) /* -EIO if msch gets a program check. */ |
346 | return ccode; | |
347 | switch (ccode) { | |
348 | case 0: /* successfull */ | |
349 | return 0; | |
350 | case 1: /* status pending */ | |
351 | return -EBUSY; | |
352 | case 2: /* busy */ | |
353 | udelay (100); /* allow for recovery */ | |
354 | ret = -EBUSY; | |
355 | break; | |
356 | case 3: /* not operational */ | |
357 | return -ENODEV; | |
358 | } | |
359 | } | |
360 | return ret; | |
361 | } | |
362 | ||
cdb912a4 SO |
363 | /** |
364 | * cio_update_schib - Perform stsch and update schib if subchannel is valid. | |
365 | * @sch: subchannel on which to perform stsch | |
366 | * Return zero on success, -ENODEV otherwise. | |
367 | */ | |
368 | int cio_update_schib(struct subchannel *sch) | |
369 | { | |
370 | struct schib schib; | |
371 | ||
372 | if (stsch(sch->schid, &schib) || !css_sch_is_valid(&schib)) | |
373 | return -ENODEV; | |
374 | ||
375 | memcpy(&sch->schib, &schib, sizeof(schib)); | |
376 | return 0; | |
377 | } | |
378 | EXPORT_SYMBOL_GPL(cio_update_schib); | |
379 | ||
44a1c19e CH |
380 | /** |
381 | * cio_enable_subchannel - enable a subchannel. | |
382 | * @sch: subchannel to be enabled | |
383 | * @intparm: interruption parameter to set | |
1da177e4 | 384 | */ |
edf22096 | 385 | int cio_enable_subchannel(struct subchannel *sch, u32 intparm) |
1da177e4 LT |
386 | { |
387 | char dbf_txt[15]; | |
1da177e4 LT |
388 | int retry; |
389 | int ret; | |
390 | ||
391 | CIO_TRACE_EVENT (2, "ensch"); | |
2a0217d5 | 392 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 | 393 | |
d7b5a4c9 CH |
394 | if (sch_is_pseudo_sch(sch)) |
395 | return -EINVAL; | |
cdb912a4 | 396 | if (cio_update_schib(sch)) |
1da177e4 LT |
397 | return -ENODEV; |
398 | ||
399 | for (retry = 5, ret = 0; retry > 0; retry--) { | |
400 | sch->schib.pmcw.ena = 1; | |
edf22096 | 401 | sch->schib.pmcw.isc = sch->isc; |
b279a4f5 | 402 | sch->schib.pmcw.intparm = intparm; |
1da177e4 LT |
403 | ret = cio_modify(sch); |
404 | if (ret == -ENODEV) | |
405 | break; | |
406 | if (ret == -EIO) | |
407 | /* | |
408 | * Got a program check in cio_modify. Try without | |
409 | * the concurrent sense bit the next time. | |
410 | */ | |
411 | sch->schib.pmcw.csense = 0; | |
412 | if (ret == 0) { | |
cdb912a4 SO |
413 | if (cio_update_schib(sch)) { |
414 | ret = -ENODEV; | |
415 | break; | |
416 | } | |
1da177e4 LT |
417 | if (sch->schib.pmcw.ena) |
418 | break; | |
419 | } | |
420 | if (ret == -EBUSY) { | |
421 | struct irb irb; | |
a8237fc4 | 422 | if (tsch(sch->schid, &irb) != 0) |
1da177e4 LT |
423 | break; |
424 | } | |
425 | } | |
426 | sprintf (dbf_txt, "ret:%d", ret); | |
427 | CIO_TRACE_EVENT (2, dbf_txt); | |
428 | return ret; | |
429 | } | |
44a1c19e | 430 | EXPORT_SYMBOL_GPL(cio_enable_subchannel); |
1da177e4 | 431 | |
44a1c19e CH |
432 | /** |
433 | * cio_disable_subchannel - disable a subchannel. | |
434 | * @sch: subchannel to disable | |
1da177e4 | 435 | */ |
44a1c19e | 436 | int cio_disable_subchannel(struct subchannel *sch) |
1da177e4 LT |
437 | { |
438 | char dbf_txt[15]; | |
1da177e4 LT |
439 | int retry; |
440 | int ret; | |
441 | ||
442 | CIO_TRACE_EVENT (2, "dissch"); | |
2a0217d5 | 443 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 | 444 | |
d7b5a4c9 CH |
445 | if (sch_is_pseudo_sch(sch)) |
446 | return 0; | |
cdb912a4 | 447 | if (cio_update_schib(sch)) |
1da177e4 LT |
448 | return -ENODEV; |
449 | ||
23d805b6 | 450 | if (scsw_actl(&sch->schib.scsw) != 0) |
1da177e4 LT |
451 | /* |
452 | * the disable function must not be called while there are | |
453 | * requests pending for completion ! | |
454 | */ | |
455 | return -EBUSY; | |
456 | ||
457 | for (retry = 5, ret = 0; retry > 0; retry--) { | |
458 | sch->schib.pmcw.ena = 0; | |
459 | ret = cio_modify(sch); | |
460 | if (ret == -ENODEV) | |
461 | break; | |
462 | if (ret == -EBUSY) | |
463 | /* | |
464 | * The subchannel is busy or status pending. | |
465 | * We'll disable when the next interrupt was delivered | |
466 | * via the state machine. | |
467 | */ | |
468 | break; | |
469 | if (ret == 0) { | |
cdb912a4 SO |
470 | if (cio_update_schib(sch)) { |
471 | ret = -ENODEV; | |
472 | break; | |
473 | } | |
1da177e4 LT |
474 | if (!sch->schib.pmcw.ena) |
475 | break; | |
476 | } | |
477 | } | |
478 | sprintf (dbf_txt, "ret:%d", ret); | |
479 | CIO_TRACE_EVENT (2, dbf_txt); | |
480 | return ret; | |
481 | } | |
44a1c19e | 482 | EXPORT_SYMBOL_GPL(cio_disable_subchannel); |
1da177e4 | 483 | |
d7b5a4c9 | 484 | int cio_create_sch_lock(struct subchannel *sch) |
2ec22984 CH |
485 | { |
486 | sch->lock = kmalloc(sizeof(spinlock_t), GFP_KERNEL); | |
487 | if (!sch->lock) | |
488 | return -ENOMEM; | |
489 | spin_lock_init(sch->lock); | |
490 | return 0; | |
491 | } | |
492 | ||
b3a686f4 | 493 | static int cio_check_devno_blacklisted(struct subchannel *sch) |
0ae7a7b2 | 494 | { |
0ae7a7b2 CH |
495 | if (is_blacklisted(sch->schid.ssid, sch->schib.pmcw.dev)) { |
496 | /* | |
497 | * This device must not be known to Linux. So we simply | |
498 | * say that there is no device and return ENODEV. | |
499 | */ | |
500 | CIO_MSG_EVENT(6, "Blacklisted device detected " | |
501 | "at devno %04X, subchannel set %x\n", | |
502 | sch->schib.pmcw.dev, sch->schid.ssid); | |
503 | return -ENODEV; | |
504 | } | |
505 | return 0; | |
506 | } | |
507 | ||
b3a686f4 CH |
508 | static int cio_validate_io_subchannel(struct subchannel *sch) |
509 | { | |
510 | /* Initialization for io subchannels. */ | |
511 | if (!css_sch_is_valid(&sch->schib)) | |
512 | return -ENODEV; | |
513 | ||
514 | /* Devno is valid. */ | |
515 | return cio_check_devno_blacklisted(sch); | |
516 | } | |
517 | ||
518 | static int cio_validate_msg_subchannel(struct subchannel *sch) | |
519 | { | |
520 | /* Initialization for message subchannels. */ | |
521 | if (!css_sch_is_valid(&sch->schib)) | |
522 | return -ENODEV; | |
523 | ||
524 | /* Devno is valid. */ | |
525 | return cio_check_devno_blacklisted(sch); | |
526 | } | |
527 | ||
0ae7a7b2 CH |
528 | /** |
529 | * cio_validate_subchannel - basic validation of subchannel | |
530 | * @sch: subchannel structure to be filled out | |
531 | * @schid: subchannel id | |
1da177e4 LT |
532 | * |
533 | * Find out subchannel type and initialize struct subchannel. | |
534 | * Return codes: | |
0ae7a7b2 | 535 | * 0 on success |
1da177e4 | 536 | * -ENXIO for non-defined subchannels |
0ae7a7b2 CH |
537 | * -ENODEV for invalid subchannels or blacklisted devices |
538 | * -EIO for subchannels in an invalid subchannel set | |
1da177e4 | 539 | */ |
0ae7a7b2 | 540 | int cio_validate_subchannel(struct subchannel *sch, struct subchannel_id schid) |
1da177e4 LT |
541 | { |
542 | char dbf_txt[15]; | |
543 | int ccode; | |
2ec22984 | 544 | int err; |
1da177e4 | 545 | |
0ae7a7b2 CH |
546 | sprintf(dbf_txt, "valsch%x", schid.sch_no); |
547 | CIO_TRACE_EVENT(4, dbf_txt); | |
1da177e4 LT |
548 | |
549 | /* Nuke all fields. */ | |
550 | memset(sch, 0, sizeof(struct subchannel)); | |
551 | ||
2ec22984 CH |
552 | sch->schid = schid; |
553 | if (cio_is_console(schid)) { | |
554 | sch->lock = cio_get_console_lock(); | |
555 | } else { | |
556 | err = cio_create_sch_lock(sch); | |
557 | if (err) | |
558 | goto out; | |
559 | } | |
6ab4879a | 560 | mutex_init(&sch->reg_mutex); |
1da177e4 | 561 | /* Set a name for the subchannel */ |
1f4e7eda CH |
562 | if (cio_is_console(schid)) |
563 | sch->dev.init_name = cio_get_console_sch_name(schid); | |
564 | else | |
565 | dev_set_name(&sch->dev, "0.%x.%04x", schid.ssid, schid.sch_no); | |
1da177e4 LT |
566 | |
567 | /* | |
568 | * The first subchannel that is not-operational (ccode==3) | |
569 | * indicates that there aren't any more devices available. | |
fb6958a5 CH |
570 | * If stsch gets an exception, it means the current subchannel set |
571 | * is not valid. | |
1da177e4 | 572 | */ |
fb6958a5 | 573 | ccode = stsch_err (schid, &sch->schib); |
2ec22984 CH |
574 | if (ccode) { |
575 | err = (ccode == 3) ? -ENXIO : ccode; | |
576 | goto out; | |
577 | } | |
1da177e4 LT |
578 | /* Copy subchannel type from path management control word. */ |
579 | sch->st = sch->schib.pmcw.st; | |
c820de39 | 580 | |
0ae7a7b2 CH |
581 | switch (sch->st) { |
582 | case SUBCHANNEL_TYPE_IO: | |
583 | err = cio_validate_io_subchannel(sch); | |
584 | break; | |
b3a686f4 CH |
585 | case SUBCHANNEL_TYPE_MSG: |
586 | err = cio_validate_msg_subchannel(sch); | |
587 | break; | |
0ae7a7b2 CH |
588 | default: |
589 | err = 0; | |
1da177e4 | 590 | } |
0ae7a7b2 | 591 | if (err) |
808e4888 | 592 | goto out; |
808e4888 | 593 | |
0ae7a7b2 CH |
594 | CIO_MSG_EVENT(4, "Subchannel 0.%x.%04x reports subchannel type %04X\n", |
595 | sch->schid.ssid, sch->schid.sch_no, sch->st); | |
1da177e4 | 596 | return 0; |
2ec22984 CH |
597 | out: |
598 | if (!cio_is_console(schid)) | |
599 | kfree(sch->lock); | |
600 | sch->lock = NULL; | |
601 | return err; | |
1da177e4 LT |
602 | } |
603 | ||
604 | /* | |
605 | * do_IRQ() handles all normal I/O device IRQ's (the special | |
606 | * SMP cross-CPU interrupts have their own specific | |
607 | * handlers). | |
608 | * | |
609 | */ | |
610 | void | |
611 | do_IRQ (struct pt_regs *regs) | |
612 | { | |
613 | struct tpi_info *tpi_info; | |
614 | struct subchannel *sch; | |
615 | struct irb *irb; | |
5a489b98 | 616 | struct pt_regs *old_regs; |
1da177e4 | 617 | |
5a489b98 | 618 | old_regs = set_irq_regs(regs); |
9d0a57cb | 619 | irq_enter(); |
43ca5c3a | 620 | s390_idle_check(); |
5a62b192 HC |
621 | if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator) |
622 | /* Serve timer interrupts first. */ | |
623 | clock_comparator_work(); | |
1da177e4 LT |
624 | /* |
625 | * Get interrupt information from lowcore | |
626 | */ | |
627 | tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID; | |
628 | irb = (struct irb *) __LC_IRB; | |
629 | do { | |
630 | kstat_cpu(smp_processor_id()).irqs[IO_INTERRUPT]++; | |
631 | /* | |
632 | * Non I/O-subchannel thin interrupts are processed differently | |
633 | */ | |
634 | if (tpi_info->adapter_IO == 1 && | |
635 | tpi_info->int_type == IO_INTERRUPT_TYPE) { | |
da7c5af8 | 636 | do_adapter_IO(tpi_info->isc); |
1da177e4 LT |
637 | continue; |
638 | } | |
639 | sch = (struct subchannel *)(unsigned long)tpi_info->intparm; | |
a806170e HC |
640 | if (!sch) { |
641 | /* Clear pending interrupt condition. */ | |
642 | tsch(tpi_info->schid, irb); | |
643 | continue; | |
644 | } | |
645 | spin_lock(sch->lock); | |
1da177e4 | 646 | /* Store interrupt response block to lowcore. */ |
a806170e | 647 | if (tsch(tpi_info->schid, irb) == 0) { |
1da177e4 LT |
648 | /* Keep subchannel information word up to date. */ |
649 | memcpy (&sch->schib.scsw, &irb->scsw, | |
650 | sizeof (irb->scsw)); | |
651 | /* Call interrupt handler if there is one. */ | |
652 | if (sch->driver && sch->driver->irq) | |
602b20f2 | 653 | sch->driver->irq(sch); |
1da177e4 | 654 | } |
a806170e | 655 | spin_unlock(sch->lock); |
1da177e4 LT |
656 | /* |
657 | * Are more interrupts pending? | |
658 | * If so, the tpi instruction will update the lowcore | |
659 | * to hold the info for the next interrupt. | |
660 | * We don't do this for VM because a tpi drops the cpu | |
661 | * out of the sie which costs more cycles than it saves. | |
662 | */ | |
663 | } while (!MACHINE_IS_VM && tpi (NULL) != 0); | |
9d0a57cb | 664 | irq_exit(); |
5a489b98 | 665 | set_irq_regs(old_regs); |
1da177e4 LT |
666 | } |
667 | ||
668 | #ifdef CONFIG_CCW_CONSOLE | |
669 | static struct subchannel console_subchannel; | |
1f4e7eda | 670 | static char console_sch_name[10] = "0.x.xxxx"; |
cd6b4f27 | 671 | static struct io_subchannel_private console_priv; |
1da177e4 LT |
672 | static int console_subchannel_in_use; |
673 | ||
191fd44c HC |
674 | /* |
675 | * Use tpi to get a pending interrupt, call the interrupt handler and | |
676 | * return a pointer to the subchannel structure. | |
677 | */ | |
678 | static int cio_tpi(void) | |
679 | { | |
680 | struct tpi_info *tpi_info; | |
681 | struct subchannel *sch; | |
682 | struct irb *irb; | |
683 | int irq_context; | |
684 | ||
685 | tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID; | |
686 | if (tpi(NULL) != 1) | |
687 | return 0; | |
688 | irb = (struct irb *) __LC_IRB; | |
689 | /* Store interrupt response block to lowcore. */ | |
690 | if (tsch(tpi_info->schid, irb) != 0) | |
691 | /* Not status pending or not operational. */ | |
692 | return 1; | |
693 | sch = (struct subchannel *)(unsigned long)tpi_info->intparm; | |
694 | if (!sch) | |
695 | return 1; | |
696 | irq_context = in_interrupt(); | |
697 | if (!irq_context) | |
698 | local_bh_disable(); | |
699 | irq_enter(); | |
700 | spin_lock(sch->lock); | |
701 | memcpy(&sch->schib.scsw, &irb->scsw, sizeof(union scsw)); | |
702 | if (sch->driver && sch->driver->irq) | |
703 | sch->driver->irq(sch); | |
704 | spin_unlock(sch->lock); | |
705 | irq_exit(); | |
706 | if (!irq_context) | |
707 | _local_bh_enable(); | |
708 | return 1; | |
709 | } | |
710 | ||
cd6b4f27 CH |
711 | void *cio_get_console_priv(void) |
712 | { | |
713 | return &console_priv; | |
714 | } | |
715 | ||
1da177e4 LT |
716 | /* |
717 | * busy wait for the next interrupt on the console | |
718 | */ | |
a806170e HC |
719 | void wait_cons_dev(void) |
720 | __releases(console_subchannel.lock) | |
721 | __acquires(console_subchannel.lock) | |
1da177e4 LT |
722 | { |
723 | unsigned long cr6 __attribute__ ((aligned (8))); | |
724 | unsigned long save_cr6 __attribute__ ((aligned (8))); | |
725 | ||
726 | /* | |
727 | * before entering the spinlock we may already have | |
728 | * processed the interrupt on a different CPU... | |
729 | */ | |
730 | if (!console_subchannel_in_use) | |
731 | return; | |
732 | ||
3a3fc29a | 733 | /* disable all but the console isc */ |
1da177e4 | 734 | __ctl_store (save_cr6, 6, 6); |
3a3fc29a | 735 | cr6 = 1UL << (31 - CONSOLE_ISC); |
1da177e4 LT |
736 | __ctl_load (cr6, 6, 6); |
737 | ||
738 | do { | |
2ec22984 | 739 | spin_unlock(console_subchannel.lock); |
1da177e4 LT |
740 | if (!cio_tpi()) |
741 | cpu_relax(); | |
2ec22984 | 742 | spin_lock(console_subchannel.lock); |
23d805b6 | 743 | } while (console_subchannel.schib.scsw.cmd.actl != 0); |
1da177e4 LT |
744 | /* |
745 | * restore previous isc value | |
746 | */ | |
747 | __ctl_load (save_cr6, 6, 6); | |
748 | } | |
749 | ||
750 | static int | |
f97a56fb CH |
751 | cio_test_for_console(struct subchannel_id schid, void *data) |
752 | { | |
fb6958a5 | 753 | if (stsch_err(schid, &console_subchannel.schib) != 0) |
f97a56fb | 754 | return -ENXIO; |
b279a4f5 CH |
755 | if ((console_subchannel.schib.pmcw.st == SUBCHANNEL_TYPE_IO) && |
756 | console_subchannel.schib.pmcw.dnv && | |
757 | (console_subchannel.schib.pmcw.dev == console_devno)) { | |
f97a56fb CH |
758 | console_irq = schid.sch_no; |
759 | return 1; /* found */ | |
760 | } | |
761 | return 0; | |
762 | } | |
763 | ||
764 | ||
765 | static int | |
766 | cio_get_console_sch_no(void) | |
1da177e4 | 767 | { |
a8237fc4 | 768 | struct subchannel_id schid; |
1da177e4 | 769 | |
a8237fc4 | 770 | init_subchannel_id(&schid); |
1da177e4 LT |
771 | if (console_irq != -1) { |
772 | /* VM provided us with the irq number of the console. */ | |
a8237fc4 CH |
773 | schid.sch_no = console_irq; |
774 | if (stsch(schid, &console_subchannel.schib) != 0 || | |
b279a4f5 | 775 | (console_subchannel.schib.pmcw.st != SUBCHANNEL_TYPE_IO) || |
1da177e4 LT |
776 | !console_subchannel.schib.pmcw.dnv) |
777 | return -1; | |
778 | console_devno = console_subchannel.schib.pmcw.dev; | |
779 | } else if (console_devno != -1) { | |
780 | /* At least the console device number is known. */ | |
f97a56fb | 781 | for_each_subchannel(cio_test_for_console, NULL); |
1da177e4 LT |
782 | if (console_irq == -1) |
783 | return -1; | |
784 | } else { | |
785 | /* unlike in 2.4, we cannot autoprobe here, since | |
786 | * the channel subsystem is not fully initialized. | |
787 | * With some luck, the HWC console can take over */ | |
1da177e4 LT |
788 | return -1; |
789 | } | |
790 | return console_irq; | |
791 | } | |
792 | ||
793 | struct subchannel * | |
794 | cio_probe_console(void) | |
795 | { | |
f97a56fb | 796 | int sch_no, ret; |
a8237fc4 | 797 | struct subchannel_id schid; |
1da177e4 LT |
798 | |
799 | if (xchg(&console_subchannel_in_use, 1) != 0) | |
800 | return ERR_PTR(-EBUSY); | |
f97a56fb CH |
801 | sch_no = cio_get_console_sch_no(); |
802 | if (sch_no == -1) { | |
1da177e4 | 803 | console_subchannel_in_use = 0; |
c78aa6cb | 804 | printk(KERN_WARNING "cio: No ccw console found!\n"); |
1da177e4 LT |
805 | return ERR_PTR(-ENODEV); |
806 | } | |
807 | memset(&console_subchannel, 0, sizeof(struct subchannel)); | |
a8237fc4 | 808 | init_subchannel_id(&schid); |
f97a56fb | 809 | schid.sch_no = sch_no; |
a8237fc4 | 810 | ret = cio_validate_subchannel(&console_subchannel, schid); |
1da177e4 LT |
811 | if (ret) { |
812 | console_subchannel_in_use = 0; | |
813 | return ERR_PTR(-ENODEV); | |
814 | } | |
815 | ||
816 | /* | |
3a3fc29a | 817 | * enable console I/O-interrupt subclass |
1da177e4 | 818 | */ |
6ef556cc | 819 | isc_register(CONSOLE_ISC); |
3a3fc29a | 820 | console_subchannel.schib.pmcw.isc = CONSOLE_ISC; |
1da177e4 | 821 | console_subchannel.schib.pmcw.intparm = |
cd6b4f27 | 822 | (u32)(addr_t)&console_subchannel; |
1da177e4 LT |
823 | ret = cio_modify(&console_subchannel); |
824 | if (ret) { | |
6ef556cc | 825 | isc_unregister(CONSOLE_ISC); |
1da177e4 LT |
826 | console_subchannel_in_use = 0; |
827 | return ERR_PTR(ret); | |
828 | } | |
829 | return &console_subchannel; | |
830 | } | |
831 | ||
832 | void | |
833 | cio_release_console(void) | |
834 | { | |
835 | console_subchannel.schib.pmcw.intparm = 0; | |
836 | cio_modify(&console_subchannel); | |
6ef556cc | 837 | isc_unregister(CONSOLE_ISC); |
1da177e4 LT |
838 | console_subchannel_in_use = 0; |
839 | } | |
840 | ||
841 | /* Bah... hack to catch console special sausages. */ | |
842 | int | |
a8237fc4 | 843 | cio_is_console(struct subchannel_id schid) |
1da177e4 LT |
844 | { |
845 | if (!console_subchannel_in_use) | |
846 | return 0; | |
a8237fc4 | 847 | return schid_equal(&schid, &console_subchannel.schid); |
1da177e4 LT |
848 | } |
849 | ||
850 | struct subchannel * | |
851 | cio_get_console_subchannel(void) | |
852 | { | |
853 | if (!console_subchannel_in_use) | |
d2c993d8 | 854 | return NULL; |
1da177e4 LT |
855 | return &console_subchannel; |
856 | } | |
857 | ||
1f4e7eda CH |
858 | const char *cio_get_console_sch_name(struct subchannel_id schid) |
859 | { | |
860 | snprintf(console_sch_name, 10, "0.%x.%04x", schid.ssid, schid.sch_no); | |
861 | return (const char *)console_sch_name; | |
862 | } | |
863 | ||
1da177e4 | 864 | #endif |
4d284cac | 865 | static int |
a8237fc4 | 866 | __disable_subchannel_easy(struct subchannel_id schid, struct schib *schib) |
1da177e4 LT |
867 | { |
868 | int retry, cc; | |
869 | ||
870 | cc = 0; | |
871 | for (retry=0;retry<3;retry++) { | |
872 | schib->pmcw.ena = 0; | |
873 | cc = msch(schid, schib); | |
874 | if (cc) | |
875 | return (cc==3?-ENODEV:-EBUSY); | |
cdb912a4 SO |
876 | if (stsch(schid, schib) || !css_sch_is_valid(schib)) |
877 | return -ENODEV; | |
1da177e4 LT |
878 | if (!schib->pmcw.ena) |
879 | return 0; | |
880 | } | |
881 | return -EBUSY; /* uhm... */ | |
882 | } | |
883 | ||
4d284cac | 884 | static int |
0ae7a7b2 | 885 | __clear_io_subchannel_easy(struct subchannel_id schid) |
1da177e4 LT |
886 | { |
887 | int retry; | |
888 | ||
889 | if (csch(schid)) | |
890 | return -ENODEV; | |
891 | for (retry=0;retry<20;retry++) { | |
892 | struct tpi_info ti; | |
893 | ||
894 | if (tpi(&ti)) { | |
a8237fc4 CH |
895 | tsch(ti.schid, (struct irb *)__LC_IRB); |
896 | if (schid_equal(&ti.schid, &schid)) | |
4c24da79 | 897 | return 0; |
1da177e4 | 898 | } |
5a0d0e65 | 899 | udelay_simple(100); |
1da177e4 LT |
900 | } |
901 | return -EBUSY; | |
902 | } | |
903 | ||
9d92a7e1 CH |
904 | static void __clear_chsc_subchannel_easy(void) |
905 | { | |
906 | /* It seems we can only wait for a bit here :/ */ | |
5a0d0e65 | 907 | udelay_simple(100); |
9d92a7e1 CH |
908 | } |
909 | ||
a45e1414 MH |
910 | static int pgm_check_occured; |
911 | ||
912 | static void cio_reset_pgm_check_handler(void) | |
913 | { | |
914 | pgm_check_occured = 1; | |
915 | } | |
916 | ||
f9c9fe3e | 917 | static int stsch_reset(struct subchannel_id schid, struct schib *addr) |
a45e1414 MH |
918 | { |
919 | int rc; | |
920 | ||
921 | pgm_check_occured = 0; | |
ab14de6c | 922 | s390_base_pgm_handler_fn = cio_reset_pgm_check_handler; |
6faf4444 | 923 | rc = stsch(schid, addr); |
ab14de6c | 924 | s390_base_pgm_handler_fn = NULL; |
aa77015c | 925 | |
ab14de6c | 926 | /* The program check handler could have changed pgm_check_occured. */ |
6faf4444 | 927 | barrier(); |
aa77015c | 928 | |
a45e1414 MH |
929 | if (pgm_check_occured) |
930 | return -EIO; | |
931 | else | |
932 | return rc; | |
933 | } | |
934 | ||
15e9b586 | 935 | static int __shutdown_subchannel_easy(struct subchannel_id schid, void *data) |
f97a56fb CH |
936 | { |
937 | struct schib schib; | |
938 | ||
a45e1414 | 939 | if (stsch_reset(schid, &schib)) |
f97a56fb CH |
940 | return -ENXIO; |
941 | if (!schib.pmcw.ena) | |
942 | return 0; | |
943 | switch(__disable_subchannel_easy(schid, &schib)) { | |
944 | case 0: | |
945 | case -ENODEV: | |
946 | break; | |
947 | default: /* -EBUSY */ | |
0ae7a7b2 CH |
948 | switch (schib.pmcw.st) { |
949 | case SUBCHANNEL_TYPE_IO: | |
950 | if (__clear_io_subchannel_easy(schid)) | |
951 | goto out; /* give up... */ | |
952 | break; | |
9d92a7e1 CH |
953 | case SUBCHANNEL_TYPE_CHSC: |
954 | __clear_chsc_subchannel_easy(); | |
955 | break; | |
0ae7a7b2 CH |
956 | default: |
957 | /* No default clear strategy */ | |
958 | break; | |
959 | } | |
f97a56fb CH |
960 | stsch(schid, &schib); |
961 | __disable_subchannel_easy(schid, &schib); | |
962 | } | |
0ae7a7b2 | 963 | out: |
f97a56fb CH |
964 | return 0; |
965 | } | |
1da177e4 | 966 | |
15e9b586 HC |
967 | static atomic_t chpid_reset_count; |
968 | ||
969 | static void s390_reset_chpids_mcck_handler(void) | |
970 | { | |
971 | struct crw crw; | |
972 | struct mci *mci; | |
973 | ||
974 | /* Check for pending channel report word. */ | |
975 | mci = (struct mci *)&S390_lowcore.mcck_interruption_code; | |
976 | if (!mci->cp) | |
977 | return; | |
978 | /* Process channel report words. */ | |
979 | while (stcrw(&crw) == 0) { | |
980 | /* Check for responses to RCHP. */ | |
981 | if (crw.slct && crw.rsc == CRW_RSC_CPATH) | |
982 | atomic_dec(&chpid_reset_count); | |
983 | } | |
984 | } | |
985 | ||
986 | #define RCHP_TIMEOUT (30 * USEC_PER_SEC) | |
987 | static void css_reset(void) | |
988 | { | |
989 | int i, ret; | |
990 | unsigned long long timeout; | |
f86635fa | 991 | struct chp_id chpid; |
15e9b586 HC |
992 | |
993 | /* Reset subchannels. */ | |
994 | for_each_subchannel(__shutdown_subchannel_easy, NULL); | |
995 | /* Reset channel paths. */ | |
ab14de6c | 996 | s390_base_mcck_handler_fn = s390_reset_chpids_mcck_handler; |
15e9b586 HC |
997 | /* Enable channel report machine checks. */ |
998 | __ctl_set_bit(14, 28); | |
999 | /* Temporarily reenable machine checks. */ | |
1000 | local_mcck_enable(); | |
f86635fa | 1001 | chp_id_init(&chpid); |
15e9b586 | 1002 | for (i = 0; i <= __MAX_CHPID; i++) { |
f86635fa PO |
1003 | chpid.id = i; |
1004 | ret = rchp(chpid); | |
15e9b586 HC |
1005 | if ((ret == 0) || (ret == 2)) |
1006 | /* | |
1007 | * rchp either succeeded, or another rchp is already | |
1008 | * in progress. In either case, we'll get a crw. | |
1009 | */ | |
1010 | atomic_inc(&chpid_reset_count); | |
1011 | } | |
1012 | /* Wait for machine check for all channel paths. */ | |
1013 | timeout = get_clock() + (RCHP_TIMEOUT << 12); | |
1014 | while (atomic_read(&chpid_reset_count) != 0) { | |
1015 | if (get_clock() > timeout) | |
1016 | break; | |
1017 | cpu_relax(); | |
1018 | } | |
1019 | /* Disable machine checks again. */ | |
1020 | local_mcck_disable(); | |
1021 | /* Disable channel report machine checks. */ | |
1022 | __ctl_clear_bit(14, 28); | |
ab14de6c | 1023 | s390_base_mcck_handler_fn = NULL; |
15e9b586 HC |
1024 | } |
1025 | ||
1026 | static struct reset_call css_reset_call = { | |
1027 | .fn = css_reset, | |
1028 | }; | |
1029 | ||
1030 | static int __init init_css_reset_call(void) | |
1031 | { | |
1032 | atomic_set(&chpid_reset_count, 0); | |
1033 | register_reset_call(&css_reset_call); | |
1034 | return 0; | |
1035 | } | |
1036 | ||
1037 | arch_initcall(init_css_reset_call); | |
1038 | ||
1039 | struct sch_match_id { | |
1040 | struct subchannel_id schid; | |
1041 | struct ccw_dev_id devid; | |
1042 | int rc; | |
1043 | }; | |
1044 | ||
1045 | static int __reipl_subchannel_match(struct subchannel_id schid, void *data) | |
1046 | { | |
1047 | struct schib schib; | |
1048 | struct sch_match_id *match_id = data; | |
1049 | ||
a45e1414 | 1050 | if (stsch_reset(schid, &schib)) |
15e9b586 | 1051 | return -ENXIO; |
b279a4f5 | 1052 | if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv && |
15e9b586 HC |
1053 | (schib.pmcw.dev == match_id->devid.devno) && |
1054 | (schid.ssid == match_id->devid.ssid)) { | |
1055 | match_id->schid = schid; | |
1056 | match_id->rc = 0; | |
1057 | return 1; | |
1058 | } | |
1059 | return 0; | |
1060 | } | |
1061 | ||
1062 | static int reipl_find_schid(struct ccw_dev_id *devid, | |
1063 | struct subchannel_id *schid) | |
1da177e4 | 1064 | { |
ff6b8ea6 MH |
1065 | struct sch_match_id match_id; |
1066 | ||
1067 | match_id.devid = *devid; | |
1068 | match_id.rc = -ENODEV; | |
15e9b586 | 1069 | for_each_subchannel(__reipl_subchannel_match, &match_id); |
ff6b8ea6 MH |
1070 | if (match_id.rc == 0) |
1071 | *schid = match_id.schid; | |
1072 | return match_id.rc; | |
1da177e4 LT |
1073 | } |
1074 | ||
ff6b8ea6 MH |
1075 | extern void do_reipl_asm(__u32 schid); |
1076 | ||
1da177e4 | 1077 | /* Make sure all subchannels are quiet before we re-ipl an lpar. */ |
ff6b8ea6 | 1078 | void reipl_ccw_dev(struct ccw_dev_id *devid) |
1da177e4 | 1079 | { |
ff6b8ea6 MH |
1080 | struct subchannel_id schid; |
1081 | ||
15e9b586 HC |
1082 | s390_reset_system(); |
1083 | if (reipl_find_schid(devid, &schid) != 0) | |
ff6b8ea6 | 1084 | panic("IPL Device not found\n"); |
ff6b8ea6 | 1085 | do_reipl_asm(*((__u32*)&schid)); |
1da177e4 | 1086 | } |
e87bfe51 | 1087 | |
6fc321fd | 1088 | int __init cio_get_iplinfo(struct cio_iplinfo *iplinfo) |
e87bfe51 HC |
1089 | { |
1090 | struct subchannel_id schid; | |
6fc321fd | 1091 | struct schib schib; |
e87bfe51 HC |
1092 | |
1093 | schid = *(struct subchannel_id *)__LC_SUBCHANNEL_ID; | |
1094 | if (!schid.one) | |
6fc321fd HC |
1095 | return -ENODEV; |
1096 | if (stsch(schid, &schib)) | |
1097 | return -ENODEV; | |
b279a4f5 CH |
1098 | if (schib.pmcw.st != SUBCHANNEL_TYPE_IO) |
1099 | return -ENODEV; | |
6fc321fd HC |
1100 | if (!schib.pmcw.dnv) |
1101 | return -ENODEV; | |
1102 | iplinfo->devno = schib.pmcw.dev; | |
1103 | iplinfo->is_qdio = schib.pmcw.qf; | |
1104 | return 0; | |
e87bfe51 | 1105 | } |
83262d63 PO |
1106 | |
1107 | /** | |
1108 | * cio_tm_start_key - perform start function | |
1109 | * @sch: subchannel on which to perform the start function | |
1110 | * @tcw: transport-command word to be started | |
1111 | * @lpm: mask of paths to use | |
1112 | * @key: storage key to use for storage access | |
1113 | * | |
1114 | * Start the tcw on the given subchannel. Return zero on success, non-zero | |
1115 | * otherwise. | |
1116 | */ | |
1117 | int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key) | |
1118 | { | |
1119 | int cc; | |
1120 | union orb *orb = &to_io_private(sch)->orb; | |
1121 | ||
1122 | memset(orb, 0, sizeof(union orb)); | |
1123 | orb->tm.intparm = (u32) (addr_t) sch; | |
1124 | orb->tm.key = key >> 4; | |
1125 | orb->tm.b = 1; | |
1126 | orb->tm.lpm = lpm ? lpm : sch->lpm; | |
1127 | orb->tm.tcw = (u32) (addr_t) tcw; | |
1128 | cc = ssch(sch->schid, orb); | |
1129 | switch (cc) { | |
1130 | case 0: | |
1131 | return 0; | |
1132 | case 1: | |
1133 | case 2: | |
1134 | return -EBUSY; | |
1135 | default: | |
1136 | return cio_start_handle_notoper(sch, lpm); | |
1137 | } | |
1138 | } | |
1139 | ||
1140 | /** | |
1141 | * cio_tm_intrg - perform interrogate function | |
1142 | * @sch - subchannel on which to perform the interrogate function | |
1143 | * | |
1144 | * If the specified subchannel is running in transport-mode, perform the | |
1145 | * interrogate function. Return zero on success, non-zero otherwie. | |
1146 | */ | |
1147 | int cio_tm_intrg(struct subchannel *sch) | |
1148 | { | |
1149 | int cc; | |
1150 | ||
1151 | if (!to_io_private(sch)->orb.tm.b) | |
1152 | return -EINVAL; | |
1153 | cc = xsch(sch->schid); | |
1154 | switch (cc) { | |
1155 | case 0: | |
1156 | case 2: | |
1157 | return 0; | |
1158 | case 1: | |
1159 | return -EBUSY; | |
1160 | default: | |
1161 | return -ENODEV; | |
1162 | } | |
1163 | } |