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 | ||
107 | /* | |
108 | * Use tpi to get a pending interrupt, call the interrupt handler and | |
109 | * return a pointer to the subchannel structure. | |
110 | */ | |
4d284cac | 111 | static int |
1da177e4 LT |
112 | cio_tpi(void) |
113 | { | |
114 | struct tpi_info *tpi_info; | |
115 | struct subchannel *sch; | |
116 | struct irb *irb; | |
117 | ||
118 | tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID; | |
119 | if (tpi (NULL) != 1) | |
120 | return 0; | |
121 | irb = (struct irb *) __LC_IRB; | |
122 | /* Store interrupt response block to lowcore. */ | |
a8237fc4 | 123 | if (tsch (tpi_info->schid, irb) != 0) |
1da177e4 LT |
124 | /* Not status pending or not operational. */ |
125 | return 1; | |
126 | sch = (struct subchannel *)(unsigned long)tpi_info->intparm; | |
127 | if (!sch) | |
128 | return 1; | |
129 | local_bh_disable(); | |
130 | irq_enter (); | |
2ec22984 | 131 | spin_lock(sch->lock); |
23d805b6 | 132 | memcpy(&sch->schib.scsw, &irb->scsw, sizeof(union scsw)); |
1da177e4 | 133 | if (sch->driver && sch->driver->irq) |
602b20f2 | 134 | sch->driver->irq(sch); |
2ec22984 | 135 | spin_unlock(sch->lock); |
1da177e4 | 136 | irq_exit (); |
1f194a4c | 137 | _local_bh_enable(); |
1da177e4 LT |
138 | return 1; |
139 | } | |
140 | ||
4d284cac | 141 | static int |
1da177e4 LT |
142 | cio_start_handle_notoper(struct subchannel *sch, __u8 lpm) |
143 | { | |
144 | char dbf_text[15]; | |
145 | ||
146 | if (lpm != 0) | |
147 | sch->lpm &= ~lpm; | |
148 | else | |
149 | sch->lpm = 0; | |
150 | ||
a8237fc4 | 151 | stsch (sch->schid, &sch->schib); |
1da177e4 | 152 | |
139b83dd | 153 | CIO_MSG_EVENT(2, "cio_start: 'not oper' status for " |
fb6958a5 CH |
154 | "subchannel 0.%x.%04x!\n", sch->schid.ssid, |
155 | sch->schid.sch_no); | |
2a0217d5 | 156 | sprintf(dbf_text, "no%s", dev_name(&sch->dev)); |
1da177e4 LT |
157 | CIO_TRACE_EVENT(0, dbf_text); |
158 | CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib)); | |
159 | ||
160 | return (sch->lpm ? -EACCES : -ENODEV); | |
161 | } | |
162 | ||
163 | int | |
164 | cio_start_key (struct subchannel *sch, /* subchannel structure */ | |
165 | struct ccw1 * cpa, /* logical channel prog addr */ | |
166 | __u8 lpm, /* logical path mask */ | |
167 | __u8 key) /* storage key */ | |
168 | { | |
169 | char dbf_txt[15]; | |
170 | int ccode; | |
83262d63 | 171 | union orb *orb; |
1da177e4 | 172 | |
cd6b4f27 | 173 | CIO_TRACE_EVENT(4, "stIO"); |
2a0217d5 | 174 | CIO_TRACE_EVENT(4, dev_name(&sch->dev)); |
1da177e4 | 175 | |
cd6b4f27 | 176 | orb = &to_io_private(sch)->orb; |
9adb8c1d | 177 | memset(orb, 0, sizeof(union orb)); |
1da177e4 | 178 | /* sch is always under 2G. */ |
83262d63 PO |
179 | orb->cmd.intparm = (u32)(addr_t)sch; |
180 | orb->cmd.fmt = 1; | |
1da177e4 | 181 | |
83262d63 PO |
182 | orb->cmd.pfch = sch->options.prefetch == 0; |
183 | orb->cmd.spnd = sch->options.suspend; | |
184 | orb->cmd.ssic = sch->options.suspend && sch->options.inter; | |
185 | orb->cmd.lpm = (lpm != 0) ? lpm : sch->lpm; | |
347a8dc3 | 186 | #ifdef CONFIG_64BIT |
1da177e4 LT |
187 | /* |
188 | * for 64 bit we always support 64 bit IDAWs with 4k page size only | |
189 | */ | |
83262d63 PO |
190 | orb->cmd.c64 = 1; |
191 | orb->cmd.i2k = 0; | |
1da177e4 | 192 | #endif |
83262d63 | 193 | orb->cmd.key = key >> 4; |
1da177e4 | 194 | /* issue "Start Subchannel" */ |
83262d63 | 195 | orb->cmd.cpa = (__u32) __pa(cpa); |
cd6b4f27 | 196 | ccode = ssch(sch->schid, orb); |
1da177e4 LT |
197 | |
198 | /* process condition code */ | |
cd6b4f27 CH |
199 | sprintf(dbf_txt, "ccode:%d", ccode); |
200 | CIO_TRACE_EVENT(4, dbf_txt); | |
1da177e4 LT |
201 | |
202 | switch (ccode) { | |
203 | case 0: | |
204 | /* | |
205 | * initialize device status information | |
206 | */ | |
23d805b6 | 207 | sch->schib.scsw.cmd.actl |= SCSW_ACTL_START_PEND; |
1da177e4 LT |
208 | return 0; |
209 | case 1: /* status pending */ | |
210 | case 2: /* busy */ | |
211 | return -EBUSY; | |
c91ebe49 | 212 | case 3: /* device/path not operational */ |
1da177e4 | 213 | return cio_start_handle_notoper(sch, lpm); |
c91ebe49 CH |
214 | default: |
215 | return ccode; | |
1da177e4 LT |
216 | } |
217 | } | |
218 | ||
219 | int | |
220 | cio_start (struct subchannel *sch, struct ccw1 *cpa, __u8 lpm) | |
221 | { | |
0b642ede | 222 | return cio_start_key(sch, cpa, lpm, PAGE_DEFAULT_KEY); |
1da177e4 LT |
223 | } |
224 | ||
225 | /* | |
226 | * resume suspended I/O operation | |
227 | */ | |
228 | int | |
229 | cio_resume (struct subchannel *sch) | |
230 | { | |
231 | char dbf_txt[15]; | |
232 | int ccode; | |
233 | ||
234 | CIO_TRACE_EVENT (4, "resIO"); | |
2a0217d5 | 235 | CIO_TRACE_EVENT(4, dev_name(&sch->dev)); |
1da177e4 | 236 | |
a8237fc4 | 237 | ccode = rsch (sch->schid); |
1da177e4 LT |
238 | |
239 | sprintf (dbf_txt, "ccode:%d", ccode); | |
240 | CIO_TRACE_EVENT (4, dbf_txt); | |
241 | ||
242 | switch (ccode) { | |
243 | case 0: | |
23d805b6 | 244 | sch->schib.scsw.cmd.actl |= SCSW_ACTL_RESUME_PEND; |
1da177e4 LT |
245 | return 0; |
246 | case 1: | |
247 | return -EBUSY; | |
248 | case 2: | |
249 | return -EINVAL; | |
250 | default: | |
251 | /* | |
252 | * useless to wait for request completion | |
253 | * as device is no longer operational ! | |
254 | */ | |
255 | return -ENODEV; | |
256 | } | |
257 | } | |
258 | ||
259 | /* | |
260 | * halt I/O operation | |
261 | */ | |
262 | int | |
263 | cio_halt(struct subchannel *sch) | |
264 | { | |
265 | char dbf_txt[15]; | |
266 | int ccode; | |
267 | ||
268 | if (!sch) | |
269 | return -ENODEV; | |
270 | ||
271 | CIO_TRACE_EVENT (2, "haltIO"); | |
2a0217d5 | 272 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 LT |
273 | |
274 | /* | |
275 | * Issue "Halt subchannel" and process condition code | |
276 | */ | |
a8237fc4 | 277 | ccode = hsch (sch->schid); |
1da177e4 LT |
278 | |
279 | sprintf (dbf_txt, "ccode:%d", ccode); | |
280 | CIO_TRACE_EVENT (2, dbf_txt); | |
281 | ||
282 | switch (ccode) { | |
283 | case 0: | |
23d805b6 | 284 | sch->schib.scsw.cmd.actl |= SCSW_ACTL_HALT_PEND; |
1da177e4 LT |
285 | return 0; |
286 | case 1: /* status pending */ | |
287 | case 2: /* busy */ | |
288 | return -EBUSY; | |
289 | default: /* device not operational */ | |
290 | return -ENODEV; | |
291 | } | |
292 | } | |
293 | ||
294 | /* | |
295 | * Clear I/O operation | |
296 | */ | |
297 | int | |
298 | cio_clear(struct subchannel *sch) | |
299 | { | |
300 | char dbf_txt[15]; | |
301 | int ccode; | |
302 | ||
303 | if (!sch) | |
304 | return -ENODEV; | |
305 | ||
306 | CIO_TRACE_EVENT (2, "clearIO"); | |
2a0217d5 | 307 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 LT |
308 | |
309 | /* | |
310 | * Issue "Clear subchannel" and process condition code | |
311 | */ | |
a8237fc4 | 312 | ccode = csch (sch->schid); |
1da177e4 LT |
313 | |
314 | sprintf (dbf_txt, "ccode:%d", ccode); | |
315 | CIO_TRACE_EVENT (2, dbf_txt); | |
316 | ||
317 | switch (ccode) { | |
318 | case 0: | |
23d805b6 | 319 | sch->schib.scsw.cmd.actl |= SCSW_ACTL_CLEAR_PEND; |
1da177e4 LT |
320 | return 0; |
321 | default: /* device not operational */ | |
322 | return -ENODEV; | |
323 | } | |
324 | } | |
325 | ||
326 | /* | |
327 | * Function: cio_cancel | |
328 | * Issues a "Cancel Subchannel" on the specified subchannel | |
329 | * Note: We don't need any fancy intparms and flags here | |
330 | * since xsch is executed synchronously. | |
331 | * Only for common I/O internal use as for now. | |
332 | */ | |
333 | int | |
334 | cio_cancel (struct subchannel *sch) | |
335 | { | |
336 | char dbf_txt[15]; | |
337 | int ccode; | |
338 | ||
339 | if (!sch) | |
340 | return -ENODEV; | |
341 | ||
342 | CIO_TRACE_EVENT (2, "cancelIO"); | |
2a0217d5 | 343 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 | 344 | |
a8237fc4 | 345 | ccode = xsch (sch->schid); |
1da177e4 LT |
346 | |
347 | sprintf (dbf_txt, "ccode:%d", ccode); | |
348 | CIO_TRACE_EVENT (2, dbf_txt); | |
349 | ||
350 | switch (ccode) { | |
351 | case 0: /* success */ | |
352 | /* Update information in scsw. */ | |
a8237fc4 | 353 | stsch (sch->schid, &sch->schib); |
1da177e4 LT |
354 | return 0; |
355 | case 1: /* status pending */ | |
356 | return -EBUSY; | |
357 | case 2: /* not applicable */ | |
358 | return -EINVAL; | |
359 | default: /* not oper */ | |
360 | return -ENODEV; | |
361 | } | |
362 | } | |
363 | ||
364 | /* | |
365 | * Function: cio_modify | |
366 | * Issues a "Modify Subchannel" on the specified subchannel | |
367 | */ | |
368 | int | |
369 | cio_modify (struct subchannel *sch) | |
370 | { | |
371 | int ccode, retry, ret; | |
372 | ||
373 | ret = 0; | |
374 | for (retry = 0; retry < 5; retry++) { | |
a8237fc4 | 375 | ccode = msch_err (sch->schid, &sch->schib); |
1da177e4 LT |
376 | if (ccode < 0) /* -EIO if msch gets a program check. */ |
377 | return ccode; | |
378 | switch (ccode) { | |
379 | case 0: /* successfull */ | |
380 | return 0; | |
381 | case 1: /* status pending */ | |
382 | return -EBUSY; | |
383 | case 2: /* busy */ | |
384 | udelay (100); /* allow for recovery */ | |
385 | ret = -EBUSY; | |
386 | break; | |
387 | case 3: /* not operational */ | |
388 | return -ENODEV; | |
389 | } | |
390 | } | |
391 | return ret; | |
392 | } | |
393 | ||
44a1c19e CH |
394 | /** |
395 | * cio_enable_subchannel - enable a subchannel. | |
396 | * @sch: subchannel to be enabled | |
397 | * @intparm: interruption parameter to set | |
1da177e4 | 398 | */ |
edf22096 | 399 | int cio_enable_subchannel(struct subchannel *sch, u32 intparm) |
1da177e4 LT |
400 | { |
401 | char dbf_txt[15]; | |
402 | int ccode; | |
403 | int retry; | |
404 | int ret; | |
405 | ||
406 | CIO_TRACE_EVENT (2, "ensch"); | |
2a0217d5 | 407 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 | 408 | |
d7b5a4c9 CH |
409 | if (sch_is_pseudo_sch(sch)) |
410 | return -EINVAL; | |
a8237fc4 | 411 | ccode = stsch (sch->schid, &sch->schib); |
1da177e4 LT |
412 | if (ccode) |
413 | return -ENODEV; | |
414 | ||
415 | for (retry = 5, ret = 0; retry > 0; retry--) { | |
416 | sch->schib.pmcw.ena = 1; | |
edf22096 | 417 | sch->schib.pmcw.isc = sch->isc; |
b279a4f5 | 418 | sch->schib.pmcw.intparm = intparm; |
1da177e4 LT |
419 | ret = cio_modify(sch); |
420 | if (ret == -ENODEV) | |
421 | break; | |
422 | if (ret == -EIO) | |
423 | /* | |
424 | * Got a program check in cio_modify. Try without | |
425 | * the concurrent sense bit the next time. | |
426 | */ | |
427 | sch->schib.pmcw.csense = 0; | |
428 | if (ret == 0) { | |
a8237fc4 | 429 | stsch (sch->schid, &sch->schib); |
1da177e4 LT |
430 | if (sch->schib.pmcw.ena) |
431 | break; | |
432 | } | |
433 | if (ret == -EBUSY) { | |
434 | struct irb irb; | |
a8237fc4 | 435 | if (tsch(sch->schid, &irb) != 0) |
1da177e4 LT |
436 | break; |
437 | } | |
438 | } | |
439 | sprintf (dbf_txt, "ret:%d", ret); | |
440 | CIO_TRACE_EVENT (2, dbf_txt); | |
441 | return ret; | |
442 | } | |
44a1c19e | 443 | EXPORT_SYMBOL_GPL(cio_enable_subchannel); |
1da177e4 | 444 | |
44a1c19e CH |
445 | /** |
446 | * cio_disable_subchannel - disable a subchannel. | |
447 | * @sch: subchannel to disable | |
1da177e4 | 448 | */ |
44a1c19e | 449 | int cio_disable_subchannel(struct subchannel *sch) |
1da177e4 LT |
450 | { |
451 | char dbf_txt[15]; | |
452 | int ccode; | |
453 | int retry; | |
454 | int ret; | |
455 | ||
456 | CIO_TRACE_EVENT (2, "dissch"); | |
2a0217d5 | 457 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 | 458 | |
d7b5a4c9 CH |
459 | if (sch_is_pseudo_sch(sch)) |
460 | return 0; | |
a8237fc4 | 461 | ccode = stsch (sch->schid, &sch->schib); |
1da177e4 LT |
462 | if (ccode == 3) /* Not operational. */ |
463 | return -ENODEV; | |
464 | ||
23d805b6 | 465 | if (scsw_actl(&sch->schib.scsw) != 0) |
1da177e4 LT |
466 | /* |
467 | * the disable function must not be called while there are | |
468 | * requests pending for completion ! | |
469 | */ | |
470 | return -EBUSY; | |
471 | ||
472 | for (retry = 5, ret = 0; retry > 0; retry--) { | |
473 | sch->schib.pmcw.ena = 0; | |
474 | ret = cio_modify(sch); | |
475 | if (ret == -ENODEV) | |
476 | break; | |
477 | if (ret == -EBUSY) | |
478 | /* | |
479 | * The subchannel is busy or status pending. | |
480 | * We'll disable when the next interrupt was delivered | |
481 | * via the state machine. | |
482 | */ | |
483 | break; | |
484 | if (ret == 0) { | |
a8237fc4 | 485 | stsch (sch->schid, &sch->schib); |
1da177e4 LT |
486 | if (!sch->schib.pmcw.ena) |
487 | break; | |
488 | } | |
489 | } | |
490 | sprintf (dbf_txt, "ret:%d", ret); | |
491 | CIO_TRACE_EVENT (2, dbf_txt); | |
492 | return ret; | |
493 | } | |
44a1c19e | 494 | EXPORT_SYMBOL_GPL(cio_disable_subchannel); |
1da177e4 | 495 | |
d7b5a4c9 | 496 | int cio_create_sch_lock(struct subchannel *sch) |
2ec22984 CH |
497 | { |
498 | sch->lock = kmalloc(sizeof(spinlock_t), GFP_KERNEL); | |
499 | if (!sch->lock) | |
500 | return -ENOMEM; | |
501 | spin_lock_init(sch->lock); | |
502 | return 0; | |
503 | } | |
504 | ||
b3a686f4 | 505 | static int cio_check_devno_blacklisted(struct subchannel *sch) |
0ae7a7b2 | 506 | { |
0ae7a7b2 CH |
507 | if (is_blacklisted(sch->schid.ssid, sch->schib.pmcw.dev)) { |
508 | /* | |
509 | * This device must not be known to Linux. So we simply | |
510 | * say that there is no device and return ENODEV. | |
511 | */ | |
512 | CIO_MSG_EVENT(6, "Blacklisted device detected " | |
513 | "at devno %04X, subchannel set %x\n", | |
514 | sch->schib.pmcw.dev, sch->schid.ssid); | |
515 | return -ENODEV; | |
516 | } | |
517 | return 0; | |
518 | } | |
519 | ||
b3a686f4 CH |
520 | static int cio_validate_io_subchannel(struct subchannel *sch) |
521 | { | |
522 | /* Initialization for io subchannels. */ | |
523 | if (!css_sch_is_valid(&sch->schib)) | |
524 | return -ENODEV; | |
525 | ||
526 | /* Devno is valid. */ | |
527 | return cio_check_devno_blacklisted(sch); | |
528 | } | |
529 | ||
530 | static int cio_validate_msg_subchannel(struct subchannel *sch) | |
531 | { | |
532 | /* Initialization for message subchannels. */ | |
533 | if (!css_sch_is_valid(&sch->schib)) | |
534 | return -ENODEV; | |
535 | ||
536 | /* Devno is valid. */ | |
537 | return cio_check_devno_blacklisted(sch); | |
538 | } | |
539 | ||
0ae7a7b2 CH |
540 | /** |
541 | * cio_validate_subchannel - basic validation of subchannel | |
542 | * @sch: subchannel structure to be filled out | |
543 | * @schid: subchannel id | |
1da177e4 LT |
544 | * |
545 | * Find out subchannel type and initialize struct subchannel. | |
546 | * Return codes: | |
0ae7a7b2 | 547 | * 0 on success |
1da177e4 | 548 | * -ENXIO for non-defined subchannels |
0ae7a7b2 CH |
549 | * -ENODEV for invalid subchannels or blacklisted devices |
550 | * -EIO for subchannels in an invalid subchannel set | |
1da177e4 | 551 | */ |
0ae7a7b2 | 552 | int cio_validate_subchannel(struct subchannel *sch, struct subchannel_id schid) |
1da177e4 LT |
553 | { |
554 | char dbf_txt[15]; | |
555 | int ccode; | |
2ec22984 | 556 | int err; |
1da177e4 | 557 | |
0ae7a7b2 CH |
558 | sprintf(dbf_txt, "valsch%x", schid.sch_no); |
559 | CIO_TRACE_EVENT(4, dbf_txt); | |
1da177e4 LT |
560 | |
561 | /* Nuke all fields. */ | |
562 | memset(sch, 0, sizeof(struct subchannel)); | |
563 | ||
2ec22984 CH |
564 | sch->schid = schid; |
565 | if (cio_is_console(schid)) { | |
566 | sch->lock = cio_get_console_lock(); | |
567 | } else { | |
568 | err = cio_create_sch_lock(sch); | |
569 | if (err) | |
570 | goto out; | |
571 | } | |
6ab4879a | 572 | mutex_init(&sch->reg_mutex); |
1da177e4 | 573 | /* Set a name for the subchannel */ |
1f4e7eda CH |
574 | if (cio_is_console(schid)) |
575 | sch->dev.init_name = cio_get_console_sch_name(schid); | |
576 | else | |
577 | dev_set_name(&sch->dev, "0.%x.%04x", schid.ssid, schid.sch_no); | |
1da177e4 LT |
578 | |
579 | /* | |
580 | * The first subchannel that is not-operational (ccode==3) | |
581 | * indicates that there aren't any more devices available. | |
fb6958a5 CH |
582 | * If stsch gets an exception, it means the current subchannel set |
583 | * is not valid. | |
1da177e4 | 584 | */ |
fb6958a5 | 585 | ccode = stsch_err (schid, &sch->schib); |
2ec22984 CH |
586 | if (ccode) { |
587 | err = (ccode == 3) ? -ENXIO : ccode; | |
588 | goto out; | |
589 | } | |
1da177e4 LT |
590 | /* Copy subchannel type from path management control word. */ |
591 | sch->st = sch->schib.pmcw.st; | |
c820de39 | 592 | |
0ae7a7b2 CH |
593 | switch (sch->st) { |
594 | case SUBCHANNEL_TYPE_IO: | |
595 | err = cio_validate_io_subchannel(sch); | |
596 | break; | |
b3a686f4 CH |
597 | case SUBCHANNEL_TYPE_MSG: |
598 | err = cio_validate_msg_subchannel(sch); | |
599 | break; | |
0ae7a7b2 CH |
600 | default: |
601 | err = 0; | |
1da177e4 | 602 | } |
0ae7a7b2 | 603 | if (err) |
808e4888 | 604 | goto out; |
808e4888 | 605 | |
0ae7a7b2 CH |
606 | CIO_MSG_EVENT(4, "Subchannel 0.%x.%04x reports subchannel type %04X\n", |
607 | sch->schid.ssid, sch->schid.sch_no, sch->st); | |
1da177e4 | 608 | return 0; |
2ec22984 CH |
609 | out: |
610 | if (!cio_is_console(schid)) | |
611 | kfree(sch->lock); | |
612 | sch->lock = NULL; | |
613 | return err; | |
1da177e4 LT |
614 | } |
615 | ||
616 | /* | |
617 | * do_IRQ() handles all normal I/O device IRQ's (the special | |
618 | * SMP cross-CPU interrupts have their own specific | |
619 | * handlers). | |
620 | * | |
621 | */ | |
622 | void | |
623 | do_IRQ (struct pt_regs *regs) | |
624 | { | |
625 | struct tpi_info *tpi_info; | |
626 | struct subchannel *sch; | |
627 | struct irb *irb; | |
5a489b98 | 628 | struct pt_regs *old_regs; |
1da177e4 | 629 | |
5a489b98 | 630 | old_regs = set_irq_regs(regs); |
9d0a57cb | 631 | irq_enter(); |
43ca5c3a | 632 | s390_idle_check(); |
5a62b192 HC |
633 | if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator) |
634 | /* Serve timer interrupts first. */ | |
635 | clock_comparator_work(); | |
1da177e4 LT |
636 | /* |
637 | * Get interrupt information from lowcore | |
638 | */ | |
639 | tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID; | |
640 | irb = (struct irb *) __LC_IRB; | |
641 | do { | |
642 | kstat_cpu(smp_processor_id()).irqs[IO_INTERRUPT]++; | |
643 | /* | |
644 | * Non I/O-subchannel thin interrupts are processed differently | |
645 | */ | |
646 | if (tpi_info->adapter_IO == 1 && | |
647 | tpi_info->int_type == IO_INTERRUPT_TYPE) { | |
da7c5af8 | 648 | do_adapter_IO(tpi_info->isc); |
1da177e4 LT |
649 | continue; |
650 | } | |
651 | sch = (struct subchannel *)(unsigned long)tpi_info->intparm; | |
a806170e HC |
652 | if (!sch) { |
653 | /* Clear pending interrupt condition. */ | |
654 | tsch(tpi_info->schid, irb); | |
655 | continue; | |
656 | } | |
657 | spin_lock(sch->lock); | |
1da177e4 | 658 | /* Store interrupt response block to lowcore. */ |
a806170e | 659 | if (tsch(tpi_info->schid, irb) == 0) { |
1da177e4 LT |
660 | /* Keep subchannel information word up to date. */ |
661 | memcpy (&sch->schib.scsw, &irb->scsw, | |
662 | sizeof (irb->scsw)); | |
663 | /* Call interrupt handler if there is one. */ | |
664 | if (sch->driver && sch->driver->irq) | |
602b20f2 | 665 | sch->driver->irq(sch); |
1da177e4 | 666 | } |
a806170e | 667 | spin_unlock(sch->lock); |
1da177e4 LT |
668 | /* |
669 | * Are more interrupts pending? | |
670 | * If so, the tpi instruction will update the lowcore | |
671 | * to hold the info for the next interrupt. | |
672 | * We don't do this for VM because a tpi drops the cpu | |
673 | * out of the sie which costs more cycles than it saves. | |
674 | */ | |
675 | } while (!MACHINE_IS_VM && tpi (NULL) != 0); | |
9d0a57cb | 676 | irq_exit(); |
5a489b98 | 677 | set_irq_regs(old_regs); |
1da177e4 LT |
678 | } |
679 | ||
680 | #ifdef CONFIG_CCW_CONSOLE | |
681 | static struct subchannel console_subchannel; | |
1f4e7eda | 682 | static char console_sch_name[10] = "0.x.xxxx"; |
cd6b4f27 | 683 | static struct io_subchannel_private console_priv; |
1da177e4 LT |
684 | static int console_subchannel_in_use; |
685 | ||
cd6b4f27 CH |
686 | void *cio_get_console_priv(void) |
687 | { | |
688 | return &console_priv; | |
689 | } | |
690 | ||
1da177e4 LT |
691 | /* |
692 | * busy wait for the next interrupt on the console | |
693 | */ | |
a806170e HC |
694 | void wait_cons_dev(void) |
695 | __releases(console_subchannel.lock) | |
696 | __acquires(console_subchannel.lock) | |
1da177e4 LT |
697 | { |
698 | unsigned long cr6 __attribute__ ((aligned (8))); | |
699 | unsigned long save_cr6 __attribute__ ((aligned (8))); | |
700 | ||
701 | /* | |
702 | * before entering the spinlock we may already have | |
703 | * processed the interrupt on a different CPU... | |
704 | */ | |
705 | if (!console_subchannel_in_use) | |
706 | return; | |
707 | ||
3a3fc29a | 708 | /* disable all but the console isc */ |
1da177e4 | 709 | __ctl_store (save_cr6, 6, 6); |
3a3fc29a | 710 | cr6 = 1UL << (31 - CONSOLE_ISC); |
1da177e4 LT |
711 | __ctl_load (cr6, 6, 6); |
712 | ||
713 | do { | |
2ec22984 | 714 | spin_unlock(console_subchannel.lock); |
1da177e4 LT |
715 | if (!cio_tpi()) |
716 | cpu_relax(); | |
2ec22984 | 717 | spin_lock(console_subchannel.lock); |
23d805b6 | 718 | } while (console_subchannel.schib.scsw.cmd.actl != 0); |
1da177e4 LT |
719 | /* |
720 | * restore previous isc value | |
721 | */ | |
722 | __ctl_load (save_cr6, 6, 6); | |
723 | } | |
724 | ||
725 | static int | |
f97a56fb CH |
726 | cio_test_for_console(struct subchannel_id schid, void *data) |
727 | { | |
fb6958a5 | 728 | if (stsch_err(schid, &console_subchannel.schib) != 0) |
f97a56fb | 729 | return -ENXIO; |
b279a4f5 CH |
730 | if ((console_subchannel.schib.pmcw.st == SUBCHANNEL_TYPE_IO) && |
731 | console_subchannel.schib.pmcw.dnv && | |
732 | (console_subchannel.schib.pmcw.dev == console_devno)) { | |
f97a56fb CH |
733 | console_irq = schid.sch_no; |
734 | return 1; /* found */ | |
735 | } | |
736 | return 0; | |
737 | } | |
738 | ||
739 | ||
740 | static int | |
741 | cio_get_console_sch_no(void) | |
1da177e4 | 742 | { |
a8237fc4 | 743 | struct subchannel_id schid; |
1da177e4 | 744 | |
a8237fc4 | 745 | init_subchannel_id(&schid); |
1da177e4 LT |
746 | if (console_irq != -1) { |
747 | /* VM provided us with the irq number of the console. */ | |
a8237fc4 CH |
748 | schid.sch_no = console_irq; |
749 | if (stsch(schid, &console_subchannel.schib) != 0 || | |
b279a4f5 | 750 | (console_subchannel.schib.pmcw.st != SUBCHANNEL_TYPE_IO) || |
1da177e4 LT |
751 | !console_subchannel.schib.pmcw.dnv) |
752 | return -1; | |
753 | console_devno = console_subchannel.schib.pmcw.dev; | |
754 | } else if (console_devno != -1) { | |
755 | /* At least the console device number is known. */ | |
f97a56fb | 756 | for_each_subchannel(cio_test_for_console, NULL); |
1da177e4 LT |
757 | if (console_irq == -1) |
758 | return -1; | |
759 | } else { | |
760 | /* unlike in 2.4, we cannot autoprobe here, since | |
761 | * the channel subsystem is not fully initialized. | |
762 | * With some luck, the HWC console can take over */ | |
1da177e4 LT |
763 | return -1; |
764 | } | |
765 | return console_irq; | |
766 | } | |
767 | ||
768 | struct subchannel * | |
769 | cio_probe_console(void) | |
770 | { | |
f97a56fb | 771 | int sch_no, ret; |
a8237fc4 | 772 | struct subchannel_id schid; |
1da177e4 LT |
773 | |
774 | if (xchg(&console_subchannel_in_use, 1) != 0) | |
775 | return ERR_PTR(-EBUSY); | |
f97a56fb CH |
776 | sch_no = cio_get_console_sch_no(); |
777 | if (sch_no == -1) { | |
1da177e4 | 778 | console_subchannel_in_use = 0; |
c78aa6cb | 779 | printk(KERN_WARNING "cio: No ccw console found!\n"); |
1da177e4 LT |
780 | return ERR_PTR(-ENODEV); |
781 | } | |
782 | memset(&console_subchannel, 0, sizeof(struct subchannel)); | |
a8237fc4 | 783 | init_subchannel_id(&schid); |
f97a56fb | 784 | schid.sch_no = sch_no; |
a8237fc4 | 785 | ret = cio_validate_subchannel(&console_subchannel, schid); |
1da177e4 LT |
786 | if (ret) { |
787 | console_subchannel_in_use = 0; | |
788 | return ERR_PTR(-ENODEV); | |
789 | } | |
790 | ||
791 | /* | |
3a3fc29a | 792 | * enable console I/O-interrupt subclass |
1da177e4 | 793 | */ |
6ef556cc | 794 | isc_register(CONSOLE_ISC); |
3a3fc29a | 795 | console_subchannel.schib.pmcw.isc = CONSOLE_ISC; |
1da177e4 | 796 | console_subchannel.schib.pmcw.intparm = |
cd6b4f27 | 797 | (u32)(addr_t)&console_subchannel; |
1da177e4 LT |
798 | ret = cio_modify(&console_subchannel); |
799 | if (ret) { | |
6ef556cc | 800 | isc_unregister(CONSOLE_ISC); |
1da177e4 LT |
801 | console_subchannel_in_use = 0; |
802 | return ERR_PTR(ret); | |
803 | } | |
804 | return &console_subchannel; | |
805 | } | |
806 | ||
807 | void | |
808 | cio_release_console(void) | |
809 | { | |
810 | console_subchannel.schib.pmcw.intparm = 0; | |
811 | cio_modify(&console_subchannel); | |
6ef556cc | 812 | isc_unregister(CONSOLE_ISC); |
1da177e4 LT |
813 | console_subchannel_in_use = 0; |
814 | } | |
815 | ||
816 | /* Bah... hack to catch console special sausages. */ | |
817 | int | |
a8237fc4 | 818 | cio_is_console(struct subchannel_id schid) |
1da177e4 LT |
819 | { |
820 | if (!console_subchannel_in_use) | |
821 | return 0; | |
a8237fc4 | 822 | return schid_equal(&schid, &console_subchannel.schid); |
1da177e4 LT |
823 | } |
824 | ||
825 | struct subchannel * | |
826 | cio_get_console_subchannel(void) | |
827 | { | |
828 | if (!console_subchannel_in_use) | |
d2c993d8 | 829 | return NULL; |
1da177e4 LT |
830 | return &console_subchannel; |
831 | } | |
832 | ||
1f4e7eda CH |
833 | const char *cio_get_console_sch_name(struct subchannel_id schid) |
834 | { | |
835 | snprintf(console_sch_name, 10, "0.%x.%04x", schid.ssid, schid.sch_no); | |
836 | return (const char *)console_sch_name; | |
837 | } | |
838 | ||
1da177e4 | 839 | #endif |
4d284cac | 840 | static int |
a8237fc4 | 841 | __disable_subchannel_easy(struct subchannel_id schid, struct schib *schib) |
1da177e4 LT |
842 | { |
843 | int retry, cc; | |
844 | ||
845 | cc = 0; | |
846 | for (retry=0;retry<3;retry++) { | |
847 | schib->pmcw.ena = 0; | |
848 | cc = msch(schid, schib); | |
849 | if (cc) | |
850 | return (cc==3?-ENODEV:-EBUSY); | |
851 | stsch(schid, schib); | |
852 | if (!schib->pmcw.ena) | |
853 | return 0; | |
854 | } | |
855 | return -EBUSY; /* uhm... */ | |
856 | } | |
857 | ||
d54853ef MS |
858 | /* we can't use the normal udelay here, since it enables external interrupts */ |
859 | ||
860 | static void udelay_reset(unsigned long usecs) | |
861 | { | |
862 | uint64_t start_cc, end_cc; | |
863 | ||
864 | asm volatile ("STCK %0" : "=m" (start_cc)); | |
865 | do { | |
866 | cpu_relax(); | |
867 | asm volatile ("STCK %0" : "=m" (end_cc)); | |
868 | } while (((end_cc - start_cc)/4096) < usecs); | |
869 | } | |
870 | ||
4d284cac | 871 | static int |
0ae7a7b2 | 872 | __clear_io_subchannel_easy(struct subchannel_id schid) |
1da177e4 LT |
873 | { |
874 | int retry; | |
875 | ||
876 | if (csch(schid)) | |
877 | return -ENODEV; | |
878 | for (retry=0;retry<20;retry++) { | |
879 | struct tpi_info ti; | |
880 | ||
881 | if (tpi(&ti)) { | |
a8237fc4 CH |
882 | tsch(ti.schid, (struct irb *)__LC_IRB); |
883 | if (schid_equal(&ti.schid, &schid)) | |
4c24da79 | 884 | return 0; |
1da177e4 | 885 | } |
d54853ef | 886 | udelay_reset(100); |
1da177e4 LT |
887 | } |
888 | return -EBUSY; | |
889 | } | |
890 | ||
9d92a7e1 CH |
891 | static void __clear_chsc_subchannel_easy(void) |
892 | { | |
893 | /* It seems we can only wait for a bit here :/ */ | |
894 | udelay_reset(100); | |
895 | } | |
896 | ||
a45e1414 MH |
897 | static int pgm_check_occured; |
898 | ||
899 | static void cio_reset_pgm_check_handler(void) | |
900 | { | |
901 | pgm_check_occured = 1; | |
902 | } | |
903 | ||
904 | static int stsch_reset(struct subchannel_id schid, volatile struct schib *addr) | |
905 | { | |
906 | int rc; | |
907 | ||
908 | pgm_check_occured = 0; | |
ab14de6c | 909 | s390_base_pgm_handler_fn = cio_reset_pgm_check_handler; |
6faf4444 | 910 | rc = stsch(schid, addr); |
ab14de6c | 911 | s390_base_pgm_handler_fn = NULL; |
aa77015c | 912 | |
ab14de6c | 913 | /* The program check handler could have changed pgm_check_occured. */ |
6faf4444 | 914 | barrier(); |
aa77015c | 915 | |
a45e1414 MH |
916 | if (pgm_check_occured) |
917 | return -EIO; | |
918 | else | |
919 | return rc; | |
920 | } | |
921 | ||
15e9b586 | 922 | static int __shutdown_subchannel_easy(struct subchannel_id schid, void *data) |
f97a56fb CH |
923 | { |
924 | struct schib schib; | |
925 | ||
a45e1414 | 926 | if (stsch_reset(schid, &schib)) |
f97a56fb CH |
927 | return -ENXIO; |
928 | if (!schib.pmcw.ena) | |
929 | return 0; | |
930 | switch(__disable_subchannel_easy(schid, &schib)) { | |
931 | case 0: | |
932 | case -ENODEV: | |
933 | break; | |
934 | default: /* -EBUSY */ | |
0ae7a7b2 CH |
935 | switch (schib.pmcw.st) { |
936 | case SUBCHANNEL_TYPE_IO: | |
937 | if (__clear_io_subchannel_easy(schid)) | |
938 | goto out; /* give up... */ | |
939 | break; | |
9d92a7e1 CH |
940 | case SUBCHANNEL_TYPE_CHSC: |
941 | __clear_chsc_subchannel_easy(); | |
942 | break; | |
0ae7a7b2 CH |
943 | default: |
944 | /* No default clear strategy */ | |
945 | break; | |
946 | } | |
f97a56fb CH |
947 | stsch(schid, &schib); |
948 | __disable_subchannel_easy(schid, &schib); | |
949 | } | |
0ae7a7b2 | 950 | out: |
f97a56fb CH |
951 | return 0; |
952 | } | |
1da177e4 | 953 | |
15e9b586 HC |
954 | static atomic_t chpid_reset_count; |
955 | ||
956 | static void s390_reset_chpids_mcck_handler(void) | |
957 | { | |
958 | struct crw crw; | |
959 | struct mci *mci; | |
960 | ||
961 | /* Check for pending channel report word. */ | |
962 | mci = (struct mci *)&S390_lowcore.mcck_interruption_code; | |
963 | if (!mci->cp) | |
964 | return; | |
965 | /* Process channel report words. */ | |
966 | while (stcrw(&crw) == 0) { | |
967 | /* Check for responses to RCHP. */ | |
968 | if (crw.slct && crw.rsc == CRW_RSC_CPATH) | |
969 | atomic_dec(&chpid_reset_count); | |
970 | } | |
971 | } | |
972 | ||
973 | #define RCHP_TIMEOUT (30 * USEC_PER_SEC) | |
974 | static void css_reset(void) | |
975 | { | |
976 | int i, ret; | |
977 | unsigned long long timeout; | |
f86635fa | 978 | struct chp_id chpid; |
15e9b586 HC |
979 | |
980 | /* Reset subchannels. */ | |
981 | for_each_subchannel(__shutdown_subchannel_easy, NULL); | |
982 | /* Reset channel paths. */ | |
ab14de6c | 983 | s390_base_mcck_handler_fn = s390_reset_chpids_mcck_handler; |
15e9b586 HC |
984 | /* Enable channel report machine checks. */ |
985 | __ctl_set_bit(14, 28); | |
986 | /* Temporarily reenable machine checks. */ | |
987 | local_mcck_enable(); | |
f86635fa | 988 | chp_id_init(&chpid); |
15e9b586 | 989 | for (i = 0; i <= __MAX_CHPID; i++) { |
f86635fa PO |
990 | chpid.id = i; |
991 | ret = rchp(chpid); | |
15e9b586 HC |
992 | if ((ret == 0) || (ret == 2)) |
993 | /* | |
994 | * rchp either succeeded, or another rchp is already | |
995 | * in progress. In either case, we'll get a crw. | |
996 | */ | |
997 | atomic_inc(&chpid_reset_count); | |
998 | } | |
999 | /* Wait for machine check for all channel paths. */ | |
1000 | timeout = get_clock() + (RCHP_TIMEOUT << 12); | |
1001 | while (atomic_read(&chpid_reset_count) != 0) { | |
1002 | if (get_clock() > timeout) | |
1003 | break; | |
1004 | cpu_relax(); | |
1005 | } | |
1006 | /* Disable machine checks again. */ | |
1007 | local_mcck_disable(); | |
1008 | /* Disable channel report machine checks. */ | |
1009 | __ctl_clear_bit(14, 28); | |
ab14de6c | 1010 | s390_base_mcck_handler_fn = NULL; |
15e9b586 HC |
1011 | } |
1012 | ||
1013 | static struct reset_call css_reset_call = { | |
1014 | .fn = css_reset, | |
1015 | }; | |
1016 | ||
1017 | static int __init init_css_reset_call(void) | |
1018 | { | |
1019 | atomic_set(&chpid_reset_count, 0); | |
1020 | register_reset_call(&css_reset_call); | |
1021 | return 0; | |
1022 | } | |
1023 | ||
1024 | arch_initcall(init_css_reset_call); | |
1025 | ||
1026 | struct sch_match_id { | |
1027 | struct subchannel_id schid; | |
1028 | struct ccw_dev_id devid; | |
1029 | int rc; | |
1030 | }; | |
1031 | ||
1032 | static int __reipl_subchannel_match(struct subchannel_id schid, void *data) | |
1033 | { | |
1034 | struct schib schib; | |
1035 | struct sch_match_id *match_id = data; | |
1036 | ||
a45e1414 | 1037 | if (stsch_reset(schid, &schib)) |
15e9b586 | 1038 | return -ENXIO; |
b279a4f5 | 1039 | if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv && |
15e9b586 HC |
1040 | (schib.pmcw.dev == match_id->devid.devno) && |
1041 | (schid.ssid == match_id->devid.ssid)) { | |
1042 | match_id->schid = schid; | |
1043 | match_id->rc = 0; | |
1044 | return 1; | |
1045 | } | |
1046 | return 0; | |
1047 | } | |
1048 | ||
1049 | static int reipl_find_schid(struct ccw_dev_id *devid, | |
1050 | struct subchannel_id *schid) | |
1da177e4 | 1051 | { |
ff6b8ea6 MH |
1052 | struct sch_match_id match_id; |
1053 | ||
1054 | match_id.devid = *devid; | |
1055 | match_id.rc = -ENODEV; | |
15e9b586 | 1056 | for_each_subchannel(__reipl_subchannel_match, &match_id); |
ff6b8ea6 MH |
1057 | if (match_id.rc == 0) |
1058 | *schid = match_id.schid; | |
1059 | return match_id.rc; | |
1da177e4 LT |
1060 | } |
1061 | ||
ff6b8ea6 MH |
1062 | extern void do_reipl_asm(__u32 schid); |
1063 | ||
1da177e4 | 1064 | /* Make sure all subchannels are quiet before we re-ipl an lpar. */ |
ff6b8ea6 | 1065 | void reipl_ccw_dev(struct ccw_dev_id *devid) |
1da177e4 | 1066 | { |
ff6b8ea6 MH |
1067 | struct subchannel_id schid; |
1068 | ||
15e9b586 HC |
1069 | s390_reset_system(); |
1070 | if (reipl_find_schid(devid, &schid) != 0) | |
ff6b8ea6 | 1071 | panic("IPL Device not found\n"); |
ff6b8ea6 | 1072 | do_reipl_asm(*((__u32*)&schid)); |
1da177e4 | 1073 | } |
e87bfe51 | 1074 | |
6fc321fd | 1075 | int __init cio_get_iplinfo(struct cio_iplinfo *iplinfo) |
e87bfe51 HC |
1076 | { |
1077 | struct subchannel_id schid; | |
6fc321fd | 1078 | struct schib schib; |
e87bfe51 HC |
1079 | |
1080 | schid = *(struct subchannel_id *)__LC_SUBCHANNEL_ID; | |
1081 | if (!schid.one) | |
6fc321fd HC |
1082 | return -ENODEV; |
1083 | if (stsch(schid, &schib)) | |
1084 | return -ENODEV; | |
b279a4f5 CH |
1085 | if (schib.pmcw.st != SUBCHANNEL_TYPE_IO) |
1086 | return -ENODEV; | |
6fc321fd HC |
1087 | if (!schib.pmcw.dnv) |
1088 | return -ENODEV; | |
1089 | iplinfo->devno = schib.pmcw.dev; | |
1090 | iplinfo->is_qdio = schib.pmcw.qf; | |
1091 | return 0; | |
e87bfe51 | 1092 | } |
83262d63 PO |
1093 | |
1094 | /** | |
1095 | * cio_tm_start_key - perform start function | |
1096 | * @sch: subchannel on which to perform the start function | |
1097 | * @tcw: transport-command word to be started | |
1098 | * @lpm: mask of paths to use | |
1099 | * @key: storage key to use for storage access | |
1100 | * | |
1101 | * Start the tcw on the given subchannel. Return zero on success, non-zero | |
1102 | * otherwise. | |
1103 | */ | |
1104 | int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key) | |
1105 | { | |
1106 | int cc; | |
1107 | union orb *orb = &to_io_private(sch)->orb; | |
1108 | ||
1109 | memset(orb, 0, sizeof(union orb)); | |
1110 | orb->tm.intparm = (u32) (addr_t) sch; | |
1111 | orb->tm.key = key >> 4; | |
1112 | orb->tm.b = 1; | |
1113 | orb->tm.lpm = lpm ? lpm : sch->lpm; | |
1114 | orb->tm.tcw = (u32) (addr_t) tcw; | |
1115 | cc = ssch(sch->schid, orb); | |
1116 | switch (cc) { | |
1117 | case 0: | |
1118 | return 0; | |
1119 | case 1: | |
1120 | case 2: | |
1121 | return -EBUSY; | |
1122 | default: | |
1123 | return cio_start_handle_notoper(sch, lpm); | |
1124 | } | |
1125 | } | |
1126 | ||
1127 | /** | |
1128 | * cio_tm_intrg - perform interrogate function | |
1129 | * @sch - subchannel on which to perform the interrogate function | |
1130 | * | |
1131 | * If the specified subchannel is running in transport-mode, perform the | |
1132 | * interrogate function. Return zero on success, non-zero otherwie. | |
1133 | */ | |
1134 | int cio_tm_intrg(struct subchannel *sch) | |
1135 | { | |
1136 | int cc; | |
1137 | ||
1138 | if (!to_io_private(sch)->orb.tm.b) | |
1139 | return -EINVAL; | |
1140 | cc = xsch(sch->schid); | |
1141 | switch (cc) { | |
1142 | case 0: | |
1143 | case 2: | |
1144 | return 0; | |
1145 | case 1: | |
1146 | return -EBUSY; | |
1147 | default: | |
1148 | return -ENODEV; | |
1149 | } | |
1150 | } |