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; | |
b1e76613 | 117 | int irq_context; |
1da177e4 LT |
118 | |
119 | tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID; | |
120 | if (tpi (NULL) != 1) | |
121 | return 0; | |
122 | irb = (struct irb *) __LC_IRB; | |
123 | /* Store interrupt response block to lowcore. */ | |
a8237fc4 | 124 | if (tsch (tpi_info->schid, irb) != 0) |
1da177e4 LT |
125 | /* Not status pending or not operational. */ |
126 | return 1; | |
127 | sch = (struct subchannel *)(unsigned long)tpi_info->intparm; | |
128 | if (!sch) | |
129 | return 1; | |
b1e76613 HC |
130 | irq_context = in_interrupt(); |
131 | if (!irq_context) | |
132 | local_bh_disable(); | |
1da177e4 | 133 | irq_enter (); |
2ec22984 | 134 | spin_lock(sch->lock); |
23d805b6 | 135 | memcpy(&sch->schib.scsw, &irb->scsw, sizeof(union scsw)); |
1da177e4 | 136 | if (sch->driver && sch->driver->irq) |
602b20f2 | 137 | sch->driver->irq(sch); |
2ec22984 | 138 | spin_unlock(sch->lock); |
1da177e4 | 139 | irq_exit (); |
b1e76613 HC |
140 | if (!irq_context) |
141 | _local_bh_enable(); | |
1da177e4 LT |
142 | return 1; |
143 | } | |
144 | ||
4d284cac | 145 | static int |
1da177e4 LT |
146 | cio_start_handle_notoper(struct subchannel *sch, __u8 lpm) |
147 | { | |
148 | char dbf_text[15]; | |
149 | ||
150 | if (lpm != 0) | |
151 | sch->lpm &= ~lpm; | |
152 | else | |
153 | sch->lpm = 0; | |
154 | ||
a8237fc4 | 155 | stsch (sch->schid, &sch->schib); |
1da177e4 | 156 | |
139b83dd | 157 | CIO_MSG_EVENT(2, "cio_start: 'not oper' status for " |
fb6958a5 CH |
158 | "subchannel 0.%x.%04x!\n", sch->schid.ssid, |
159 | sch->schid.sch_no); | |
2a0217d5 | 160 | sprintf(dbf_text, "no%s", dev_name(&sch->dev)); |
1da177e4 LT |
161 | CIO_TRACE_EVENT(0, dbf_text); |
162 | CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib)); | |
163 | ||
164 | return (sch->lpm ? -EACCES : -ENODEV); | |
165 | } | |
166 | ||
167 | int | |
168 | cio_start_key (struct subchannel *sch, /* subchannel structure */ | |
169 | struct ccw1 * cpa, /* logical channel prog addr */ | |
170 | __u8 lpm, /* logical path mask */ | |
171 | __u8 key) /* storage key */ | |
172 | { | |
173 | char dbf_txt[15]; | |
174 | int ccode; | |
83262d63 | 175 | union orb *orb; |
1da177e4 | 176 | |
cd6b4f27 | 177 | CIO_TRACE_EVENT(4, "stIO"); |
2a0217d5 | 178 | CIO_TRACE_EVENT(4, dev_name(&sch->dev)); |
1da177e4 | 179 | |
cd6b4f27 | 180 | orb = &to_io_private(sch)->orb; |
9adb8c1d | 181 | memset(orb, 0, sizeof(union orb)); |
1da177e4 | 182 | /* sch is always under 2G. */ |
83262d63 PO |
183 | orb->cmd.intparm = (u32)(addr_t)sch; |
184 | orb->cmd.fmt = 1; | |
1da177e4 | 185 | |
83262d63 PO |
186 | orb->cmd.pfch = sch->options.prefetch == 0; |
187 | orb->cmd.spnd = sch->options.suspend; | |
188 | orb->cmd.ssic = sch->options.suspend && sch->options.inter; | |
189 | orb->cmd.lpm = (lpm != 0) ? lpm : sch->lpm; | |
347a8dc3 | 190 | #ifdef CONFIG_64BIT |
1da177e4 LT |
191 | /* |
192 | * for 64 bit we always support 64 bit IDAWs with 4k page size only | |
193 | */ | |
83262d63 PO |
194 | orb->cmd.c64 = 1; |
195 | orb->cmd.i2k = 0; | |
1da177e4 | 196 | #endif |
83262d63 | 197 | orb->cmd.key = key >> 4; |
1da177e4 | 198 | /* issue "Start Subchannel" */ |
83262d63 | 199 | orb->cmd.cpa = (__u32) __pa(cpa); |
cd6b4f27 | 200 | ccode = ssch(sch->schid, orb); |
1da177e4 LT |
201 | |
202 | /* process condition code */ | |
cd6b4f27 CH |
203 | sprintf(dbf_txt, "ccode:%d", ccode); |
204 | CIO_TRACE_EVENT(4, dbf_txt); | |
1da177e4 LT |
205 | |
206 | switch (ccode) { | |
207 | case 0: | |
208 | /* | |
209 | * initialize device status information | |
210 | */ | |
23d805b6 | 211 | sch->schib.scsw.cmd.actl |= SCSW_ACTL_START_PEND; |
1da177e4 LT |
212 | return 0; |
213 | case 1: /* status pending */ | |
214 | case 2: /* busy */ | |
215 | return -EBUSY; | |
c91ebe49 | 216 | case 3: /* device/path not operational */ |
1da177e4 | 217 | return cio_start_handle_notoper(sch, lpm); |
c91ebe49 CH |
218 | default: |
219 | return ccode; | |
1da177e4 LT |
220 | } |
221 | } | |
222 | ||
223 | int | |
224 | cio_start (struct subchannel *sch, struct ccw1 *cpa, __u8 lpm) | |
225 | { | |
0b642ede | 226 | return cio_start_key(sch, cpa, lpm, PAGE_DEFAULT_KEY); |
1da177e4 LT |
227 | } |
228 | ||
229 | /* | |
230 | * resume suspended I/O operation | |
231 | */ | |
232 | int | |
233 | cio_resume (struct subchannel *sch) | |
234 | { | |
235 | char dbf_txt[15]; | |
236 | int ccode; | |
237 | ||
238 | CIO_TRACE_EVENT (4, "resIO"); | |
2a0217d5 | 239 | CIO_TRACE_EVENT(4, dev_name(&sch->dev)); |
1da177e4 | 240 | |
a8237fc4 | 241 | ccode = rsch (sch->schid); |
1da177e4 LT |
242 | |
243 | sprintf (dbf_txt, "ccode:%d", ccode); | |
244 | CIO_TRACE_EVENT (4, dbf_txt); | |
245 | ||
246 | switch (ccode) { | |
247 | case 0: | |
23d805b6 | 248 | sch->schib.scsw.cmd.actl |= SCSW_ACTL_RESUME_PEND; |
1da177e4 LT |
249 | return 0; |
250 | case 1: | |
251 | return -EBUSY; | |
252 | case 2: | |
253 | return -EINVAL; | |
254 | default: | |
255 | /* | |
256 | * useless to wait for request completion | |
257 | * as device is no longer operational ! | |
258 | */ | |
259 | return -ENODEV; | |
260 | } | |
261 | } | |
262 | ||
263 | /* | |
264 | * halt I/O operation | |
265 | */ | |
266 | int | |
267 | cio_halt(struct subchannel *sch) | |
268 | { | |
269 | char dbf_txt[15]; | |
270 | int ccode; | |
271 | ||
272 | if (!sch) | |
273 | return -ENODEV; | |
274 | ||
275 | CIO_TRACE_EVENT (2, "haltIO"); | |
2a0217d5 | 276 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 LT |
277 | |
278 | /* | |
279 | * Issue "Halt subchannel" and process condition code | |
280 | */ | |
a8237fc4 | 281 | ccode = hsch (sch->schid); |
1da177e4 LT |
282 | |
283 | sprintf (dbf_txt, "ccode:%d", ccode); | |
284 | CIO_TRACE_EVENT (2, dbf_txt); | |
285 | ||
286 | switch (ccode) { | |
287 | case 0: | |
23d805b6 | 288 | sch->schib.scsw.cmd.actl |= SCSW_ACTL_HALT_PEND; |
1da177e4 LT |
289 | return 0; |
290 | case 1: /* status pending */ | |
291 | case 2: /* busy */ | |
292 | return -EBUSY; | |
293 | default: /* device not operational */ | |
294 | return -ENODEV; | |
295 | } | |
296 | } | |
297 | ||
298 | /* | |
299 | * Clear I/O operation | |
300 | */ | |
301 | int | |
302 | cio_clear(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, "clearIO"); | |
2a0217d5 | 311 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 LT |
312 | |
313 | /* | |
314 | * Issue "Clear subchannel" and process condition code | |
315 | */ | |
a8237fc4 | 316 | ccode = csch (sch->schid); |
1da177e4 LT |
317 | |
318 | sprintf (dbf_txt, "ccode:%d", ccode); | |
319 | CIO_TRACE_EVENT (2, dbf_txt); | |
320 | ||
321 | switch (ccode) { | |
322 | case 0: | |
23d805b6 | 323 | sch->schib.scsw.cmd.actl |= SCSW_ACTL_CLEAR_PEND; |
1da177e4 LT |
324 | return 0; |
325 | default: /* device not operational */ | |
326 | return -ENODEV; | |
327 | } | |
328 | } | |
329 | ||
330 | /* | |
331 | * Function: cio_cancel | |
332 | * Issues a "Cancel Subchannel" on the specified subchannel | |
333 | * Note: We don't need any fancy intparms and flags here | |
334 | * since xsch is executed synchronously. | |
335 | * Only for common I/O internal use as for now. | |
336 | */ | |
337 | int | |
338 | cio_cancel (struct subchannel *sch) | |
339 | { | |
340 | char dbf_txt[15]; | |
341 | int ccode; | |
342 | ||
343 | if (!sch) | |
344 | return -ENODEV; | |
345 | ||
346 | CIO_TRACE_EVENT (2, "cancelIO"); | |
2a0217d5 | 347 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 | 348 | |
a8237fc4 | 349 | ccode = xsch (sch->schid); |
1da177e4 LT |
350 | |
351 | sprintf (dbf_txt, "ccode:%d", ccode); | |
352 | CIO_TRACE_EVENT (2, dbf_txt); | |
353 | ||
354 | switch (ccode) { | |
355 | case 0: /* success */ | |
356 | /* Update information in scsw. */ | |
a8237fc4 | 357 | stsch (sch->schid, &sch->schib); |
1da177e4 LT |
358 | return 0; |
359 | case 1: /* status pending */ | |
360 | return -EBUSY; | |
361 | case 2: /* not applicable */ | |
362 | return -EINVAL; | |
363 | default: /* not oper */ | |
364 | return -ENODEV; | |
365 | } | |
366 | } | |
367 | ||
368 | /* | |
369 | * Function: cio_modify | |
370 | * Issues a "Modify Subchannel" on the specified subchannel | |
371 | */ | |
372 | int | |
373 | cio_modify (struct subchannel *sch) | |
374 | { | |
375 | int ccode, retry, ret; | |
376 | ||
377 | ret = 0; | |
378 | for (retry = 0; retry < 5; retry++) { | |
a8237fc4 | 379 | ccode = msch_err (sch->schid, &sch->schib); |
1da177e4 LT |
380 | if (ccode < 0) /* -EIO if msch gets a program check. */ |
381 | return ccode; | |
382 | switch (ccode) { | |
383 | case 0: /* successfull */ | |
384 | return 0; | |
385 | case 1: /* status pending */ | |
386 | return -EBUSY; | |
387 | case 2: /* busy */ | |
388 | udelay (100); /* allow for recovery */ | |
389 | ret = -EBUSY; | |
390 | break; | |
391 | case 3: /* not operational */ | |
392 | return -ENODEV; | |
393 | } | |
394 | } | |
395 | return ret; | |
396 | } | |
397 | ||
44a1c19e CH |
398 | /** |
399 | * cio_enable_subchannel - enable a subchannel. | |
400 | * @sch: subchannel to be enabled | |
401 | * @intparm: interruption parameter to set | |
1da177e4 | 402 | */ |
edf22096 | 403 | int cio_enable_subchannel(struct subchannel *sch, u32 intparm) |
1da177e4 LT |
404 | { |
405 | char dbf_txt[15]; | |
406 | int ccode; | |
407 | int retry; | |
408 | int ret; | |
409 | ||
410 | CIO_TRACE_EVENT (2, "ensch"); | |
2a0217d5 | 411 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 | 412 | |
d7b5a4c9 CH |
413 | if (sch_is_pseudo_sch(sch)) |
414 | return -EINVAL; | |
a8237fc4 | 415 | ccode = stsch (sch->schid, &sch->schib); |
1da177e4 LT |
416 | if (ccode) |
417 | return -ENODEV; | |
418 | ||
419 | for (retry = 5, ret = 0; retry > 0; retry--) { | |
420 | sch->schib.pmcw.ena = 1; | |
edf22096 | 421 | sch->schib.pmcw.isc = sch->isc; |
b279a4f5 | 422 | sch->schib.pmcw.intparm = intparm; |
1da177e4 LT |
423 | ret = cio_modify(sch); |
424 | if (ret == -ENODEV) | |
425 | break; | |
426 | if (ret == -EIO) | |
427 | /* | |
428 | * Got a program check in cio_modify. Try without | |
429 | * the concurrent sense bit the next time. | |
430 | */ | |
431 | sch->schib.pmcw.csense = 0; | |
432 | if (ret == 0) { | |
a8237fc4 | 433 | stsch (sch->schid, &sch->schib); |
1da177e4 LT |
434 | if (sch->schib.pmcw.ena) |
435 | break; | |
436 | } | |
437 | if (ret == -EBUSY) { | |
438 | struct irb irb; | |
a8237fc4 | 439 | if (tsch(sch->schid, &irb) != 0) |
1da177e4 LT |
440 | break; |
441 | } | |
442 | } | |
443 | sprintf (dbf_txt, "ret:%d", ret); | |
444 | CIO_TRACE_EVENT (2, dbf_txt); | |
445 | return ret; | |
446 | } | |
44a1c19e | 447 | EXPORT_SYMBOL_GPL(cio_enable_subchannel); |
1da177e4 | 448 | |
44a1c19e CH |
449 | /** |
450 | * cio_disable_subchannel - disable a subchannel. | |
451 | * @sch: subchannel to disable | |
1da177e4 | 452 | */ |
44a1c19e | 453 | int cio_disable_subchannel(struct subchannel *sch) |
1da177e4 LT |
454 | { |
455 | char dbf_txt[15]; | |
456 | int ccode; | |
457 | int retry; | |
458 | int ret; | |
459 | ||
460 | CIO_TRACE_EVENT (2, "dissch"); | |
2a0217d5 | 461 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 | 462 | |
d7b5a4c9 CH |
463 | if (sch_is_pseudo_sch(sch)) |
464 | return 0; | |
a8237fc4 | 465 | ccode = stsch (sch->schid, &sch->schib); |
1da177e4 LT |
466 | if (ccode == 3) /* Not operational. */ |
467 | return -ENODEV; | |
468 | ||
23d805b6 | 469 | if (scsw_actl(&sch->schib.scsw) != 0) |
1da177e4 LT |
470 | /* |
471 | * the disable function must not be called while there are | |
472 | * requests pending for completion ! | |
473 | */ | |
474 | return -EBUSY; | |
475 | ||
476 | for (retry = 5, ret = 0; retry > 0; retry--) { | |
477 | sch->schib.pmcw.ena = 0; | |
478 | ret = cio_modify(sch); | |
479 | if (ret == -ENODEV) | |
480 | break; | |
481 | if (ret == -EBUSY) | |
482 | /* | |
483 | * The subchannel is busy or status pending. | |
484 | * We'll disable when the next interrupt was delivered | |
485 | * via the state machine. | |
486 | */ | |
487 | break; | |
488 | if (ret == 0) { | |
a8237fc4 | 489 | stsch (sch->schid, &sch->schib); |
1da177e4 LT |
490 | if (!sch->schib.pmcw.ena) |
491 | break; | |
492 | } | |
493 | } | |
494 | sprintf (dbf_txt, "ret:%d", ret); | |
495 | CIO_TRACE_EVENT (2, dbf_txt); | |
496 | return ret; | |
497 | } | |
44a1c19e | 498 | EXPORT_SYMBOL_GPL(cio_disable_subchannel); |
1da177e4 | 499 | |
d7b5a4c9 | 500 | int cio_create_sch_lock(struct subchannel *sch) |
2ec22984 CH |
501 | { |
502 | sch->lock = kmalloc(sizeof(spinlock_t), GFP_KERNEL); | |
503 | if (!sch->lock) | |
504 | return -ENOMEM; | |
505 | spin_lock_init(sch->lock); | |
506 | return 0; | |
507 | } | |
508 | ||
b3a686f4 | 509 | static int cio_check_devno_blacklisted(struct subchannel *sch) |
0ae7a7b2 | 510 | { |
0ae7a7b2 CH |
511 | if (is_blacklisted(sch->schid.ssid, sch->schib.pmcw.dev)) { |
512 | /* | |
513 | * This device must not be known to Linux. So we simply | |
514 | * say that there is no device and return ENODEV. | |
515 | */ | |
516 | CIO_MSG_EVENT(6, "Blacklisted device detected " | |
517 | "at devno %04X, subchannel set %x\n", | |
518 | sch->schib.pmcw.dev, sch->schid.ssid); | |
519 | return -ENODEV; | |
520 | } | |
521 | return 0; | |
522 | } | |
523 | ||
b3a686f4 CH |
524 | static int cio_validate_io_subchannel(struct subchannel *sch) |
525 | { | |
526 | /* Initialization for io subchannels. */ | |
527 | if (!css_sch_is_valid(&sch->schib)) | |
528 | return -ENODEV; | |
529 | ||
530 | /* Devno is valid. */ | |
531 | return cio_check_devno_blacklisted(sch); | |
532 | } | |
533 | ||
534 | static int cio_validate_msg_subchannel(struct subchannel *sch) | |
535 | { | |
536 | /* Initialization for message subchannels. */ | |
537 | if (!css_sch_is_valid(&sch->schib)) | |
538 | return -ENODEV; | |
539 | ||
540 | /* Devno is valid. */ | |
541 | return cio_check_devno_blacklisted(sch); | |
542 | } | |
543 | ||
0ae7a7b2 CH |
544 | /** |
545 | * cio_validate_subchannel - basic validation of subchannel | |
546 | * @sch: subchannel structure to be filled out | |
547 | * @schid: subchannel id | |
1da177e4 LT |
548 | * |
549 | * Find out subchannel type and initialize struct subchannel. | |
550 | * Return codes: | |
0ae7a7b2 | 551 | * 0 on success |
1da177e4 | 552 | * -ENXIO for non-defined subchannels |
0ae7a7b2 CH |
553 | * -ENODEV for invalid subchannels or blacklisted devices |
554 | * -EIO for subchannels in an invalid subchannel set | |
1da177e4 | 555 | */ |
0ae7a7b2 | 556 | int cio_validate_subchannel(struct subchannel *sch, struct subchannel_id schid) |
1da177e4 LT |
557 | { |
558 | char dbf_txt[15]; | |
559 | int ccode; | |
2ec22984 | 560 | int err; |
1da177e4 | 561 | |
0ae7a7b2 CH |
562 | sprintf(dbf_txt, "valsch%x", schid.sch_no); |
563 | CIO_TRACE_EVENT(4, dbf_txt); | |
1da177e4 LT |
564 | |
565 | /* Nuke all fields. */ | |
566 | memset(sch, 0, sizeof(struct subchannel)); | |
567 | ||
2ec22984 CH |
568 | sch->schid = schid; |
569 | if (cio_is_console(schid)) { | |
570 | sch->lock = cio_get_console_lock(); | |
571 | } else { | |
572 | err = cio_create_sch_lock(sch); | |
573 | if (err) | |
574 | goto out; | |
575 | } | |
6ab4879a | 576 | mutex_init(&sch->reg_mutex); |
1da177e4 | 577 | /* Set a name for the subchannel */ |
1f4e7eda CH |
578 | if (cio_is_console(schid)) |
579 | sch->dev.init_name = cio_get_console_sch_name(schid); | |
580 | else | |
581 | dev_set_name(&sch->dev, "0.%x.%04x", schid.ssid, schid.sch_no); | |
1da177e4 LT |
582 | |
583 | /* | |
584 | * The first subchannel that is not-operational (ccode==3) | |
585 | * indicates that there aren't any more devices available. | |
fb6958a5 CH |
586 | * If stsch gets an exception, it means the current subchannel set |
587 | * is not valid. | |
1da177e4 | 588 | */ |
fb6958a5 | 589 | ccode = stsch_err (schid, &sch->schib); |
2ec22984 CH |
590 | if (ccode) { |
591 | err = (ccode == 3) ? -ENXIO : ccode; | |
592 | goto out; | |
593 | } | |
1da177e4 LT |
594 | /* Copy subchannel type from path management control word. */ |
595 | sch->st = sch->schib.pmcw.st; | |
c820de39 | 596 | |
0ae7a7b2 CH |
597 | switch (sch->st) { |
598 | case SUBCHANNEL_TYPE_IO: | |
599 | err = cio_validate_io_subchannel(sch); | |
600 | break; | |
b3a686f4 CH |
601 | case SUBCHANNEL_TYPE_MSG: |
602 | err = cio_validate_msg_subchannel(sch); | |
603 | break; | |
0ae7a7b2 CH |
604 | default: |
605 | err = 0; | |
1da177e4 | 606 | } |
0ae7a7b2 | 607 | if (err) |
808e4888 | 608 | goto out; |
808e4888 | 609 | |
0ae7a7b2 CH |
610 | CIO_MSG_EVENT(4, "Subchannel 0.%x.%04x reports subchannel type %04X\n", |
611 | sch->schid.ssid, sch->schid.sch_no, sch->st); | |
1da177e4 | 612 | return 0; |
2ec22984 CH |
613 | out: |
614 | if (!cio_is_console(schid)) | |
615 | kfree(sch->lock); | |
616 | sch->lock = NULL; | |
617 | return err; | |
1da177e4 LT |
618 | } |
619 | ||
620 | /* | |
621 | * do_IRQ() handles all normal I/O device IRQ's (the special | |
622 | * SMP cross-CPU interrupts have their own specific | |
623 | * handlers). | |
624 | * | |
625 | */ | |
626 | void | |
627 | do_IRQ (struct pt_regs *regs) | |
628 | { | |
629 | struct tpi_info *tpi_info; | |
630 | struct subchannel *sch; | |
631 | struct irb *irb; | |
5a489b98 | 632 | struct pt_regs *old_regs; |
1da177e4 | 633 | |
5a489b98 | 634 | old_regs = set_irq_regs(regs); |
9d0a57cb | 635 | irq_enter(); |
43ca5c3a | 636 | s390_idle_check(); |
5a62b192 HC |
637 | if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator) |
638 | /* Serve timer interrupts first. */ | |
639 | clock_comparator_work(); | |
1da177e4 LT |
640 | /* |
641 | * Get interrupt information from lowcore | |
642 | */ | |
643 | tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID; | |
644 | irb = (struct irb *) __LC_IRB; | |
645 | do { | |
646 | kstat_cpu(smp_processor_id()).irqs[IO_INTERRUPT]++; | |
647 | /* | |
648 | * Non I/O-subchannel thin interrupts are processed differently | |
649 | */ | |
650 | if (tpi_info->adapter_IO == 1 && | |
651 | tpi_info->int_type == IO_INTERRUPT_TYPE) { | |
da7c5af8 | 652 | do_adapter_IO(tpi_info->isc); |
1da177e4 LT |
653 | continue; |
654 | } | |
655 | sch = (struct subchannel *)(unsigned long)tpi_info->intparm; | |
a806170e HC |
656 | if (!sch) { |
657 | /* Clear pending interrupt condition. */ | |
658 | tsch(tpi_info->schid, irb); | |
659 | continue; | |
660 | } | |
661 | spin_lock(sch->lock); | |
1da177e4 | 662 | /* Store interrupt response block to lowcore. */ |
a806170e | 663 | if (tsch(tpi_info->schid, irb) == 0) { |
1da177e4 LT |
664 | /* Keep subchannel information word up to date. */ |
665 | memcpy (&sch->schib.scsw, &irb->scsw, | |
666 | sizeof (irb->scsw)); | |
667 | /* Call interrupt handler if there is one. */ | |
668 | if (sch->driver && sch->driver->irq) | |
602b20f2 | 669 | sch->driver->irq(sch); |
1da177e4 | 670 | } |
a806170e | 671 | spin_unlock(sch->lock); |
1da177e4 LT |
672 | /* |
673 | * Are more interrupts pending? | |
674 | * If so, the tpi instruction will update the lowcore | |
675 | * to hold the info for the next interrupt. | |
676 | * We don't do this for VM because a tpi drops the cpu | |
677 | * out of the sie which costs more cycles than it saves. | |
678 | */ | |
679 | } while (!MACHINE_IS_VM && tpi (NULL) != 0); | |
9d0a57cb | 680 | irq_exit(); |
5a489b98 | 681 | set_irq_regs(old_regs); |
1da177e4 LT |
682 | } |
683 | ||
684 | #ifdef CONFIG_CCW_CONSOLE | |
685 | static struct subchannel console_subchannel; | |
1f4e7eda | 686 | static char console_sch_name[10] = "0.x.xxxx"; |
cd6b4f27 | 687 | static struct io_subchannel_private console_priv; |
1da177e4 LT |
688 | static int console_subchannel_in_use; |
689 | ||
cd6b4f27 CH |
690 | void *cio_get_console_priv(void) |
691 | { | |
692 | return &console_priv; | |
693 | } | |
694 | ||
1da177e4 LT |
695 | /* |
696 | * busy wait for the next interrupt on the console | |
697 | */ | |
a806170e HC |
698 | void wait_cons_dev(void) |
699 | __releases(console_subchannel.lock) | |
700 | __acquires(console_subchannel.lock) | |
1da177e4 LT |
701 | { |
702 | unsigned long cr6 __attribute__ ((aligned (8))); | |
703 | unsigned long save_cr6 __attribute__ ((aligned (8))); | |
704 | ||
705 | /* | |
706 | * before entering the spinlock we may already have | |
707 | * processed the interrupt on a different CPU... | |
708 | */ | |
709 | if (!console_subchannel_in_use) | |
710 | return; | |
711 | ||
3a3fc29a | 712 | /* disable all but the console isc */ |
1da177e4 | 713 | __ctl_store (save_cr6, 6, 6); |
3a3fc29a | 714 | cr6 = 1UL << (31 - CONSOLE_ISC); |
1da177e4 LT |
715 | __ctl_load (cr6, 6, 6); |
716 | ||
717 | do { | |
2ec22984 | 718 | spin_unlock(console_subchannel.lock); |
1da177e4 LT |
719 | if (!cio_tpi()) |
720 | cpu_relax(); | |
2ec22984 | 721 | spin_lock(console_subchannel.lock); |
23d805b6 | 722 | } while (console_subchannel.schib.scsw.cmd.actl != 0); |
1da177e4 LT |
723 | /* |
724 | * restore previous isc value | |
725 | */ | |
726 | __ctl_load (save_cr6, 6, 6); | |
727 | } | |
728 | ||
729 | static int | |
f97a56fb CH |
730 | cio_test_for_console(struct subchannel_id schid, void *data) |
731 | { | |
fb6958a5 | 732 | if (stsch_err(schid, &console_subchannel.schib) != 0) |
f97a56fb | 733 | return -ENXIO; |
b279a4f5 CH |
734 | if ((console_subchannel.schib.pmcw.st == SUBCHANNEL_TYPE_IO) && |
735 | console_subchannel.schib.pmcw.dnv && | |
736 | (console_subchannel.schib.pmcw.dev == console_devno)) { | |
f97a56fb CH |
737 | console_irq = schid.sch_no; |
738 | return 1; /* found */ | |
739 | } | |
740 | return 0; | |
741 | } | |
742 | ||
743 | ||
744 | static int | |
745 | cio_get_console_sch_no(void) | |
1da177e4 | 746 | { |
a8237fc4 | 747 | struct subchannel_id schid; |
1da177e4 | 748 | |
a8237fc4 | 749 | init_subchannel_id(&schid); |
1da177e4 LT |
750 | if (console_irq != -1) { |
751 | /* VM provided us with the irq number of the console. */ | |
a8237fc4 CH |
752 | schid.sch_no = console_irq; |
753 | if (stsch(schid, &console_subchannel.schib) != 0 || | |
b279a4f5 | 754 | (console_subchannel.schib.pmcw.st != SUBCHANNEL_TYPE_IO) || |
1da177e4 LT |
755 | !console_subchannel.schib.pmcw.dnv) |
756 | return -1; | |
757 | console_devno = console_subchannel.schib.pmcw.dev; | |
758 | } else if (console_devno != -1) { | |
759 | /* At least the console device number is known. */ | |
f97a56fb | 760 | for_each_subchannel(cio_test_for_console, NULL); |
1da177e4 LT |
761 | if (console_irq == -1) |
762 | return -1; | |
763 | } else { | |
764 | /* unlike in 2.4, we cannot autoprobe here, since | |
765 | * the channel subsystem is not fully initialized. | |
766 | * With some luck, the HWC console can take over */ | |
1da177e4 LT |
767 | return -1; |
768 | } | |
769 | return console_irq; | |
770 | } | |
771 | ||
772 | struct subchannel * | |
773 | cio_probe_console(void) | |
774 | { | |
f97a56fb | 775 | int sch_no, ret; |
a8237fc4 | 776 | struct subchannel_id schid; |
1da177e4 LT |
777 | |
778 | if (xchg(&console_subchannel_in_use, 1) != 0) | |
779 | return ERR_PTR(-EBUSY); | |
f97a56fb CH |
780 | sch_no = cio_get_console_sch_no(); |
781 | if (sch_no == -1) { | |
1da177e4 | 782 | console_subchannel_in_use = 0; |
c78aa6cb | 783 | printk(KERN_WARNING "cio: No ccw console found!\n"); |
1da177e4 LT |
784 | return ERR_PTR(-ENODEV); |
785 | } | |
786 | memset(&console_subchannel, 0, sizeof(struct subchannel)); | |
a8237fc4 | 787 | init_subchannel_id(&schid); |
f97a56fb | 788 | schid.sch_no = sch_no; |
a8237fc4 | 789 | ret = cio_validate_subchannel(&console_subchannel, schid); |
1da177e4 LT |
790 | if (ret) { |
791 | console_subchannel_in_use = 0; | |
792 | return ERR_PTR(-ENODEV); | |
793 | } | |
794 | ||
795 | /* | |
3a3fc29a | 796 | * enable console I/O-interrupt subclass |
1da177e4 | 797 | */ |
6ef556cc | 798 | isc_register(CONSOLE_ISC); |
3a3fc29a | 799 | console_subchannel.schib.pmcw.isc = CONSOLE_ISC; |
1da177e4 | 800 | console_subchannel.schib.pmcw.intparm = |
cd6b4f27 | 801 | (u32)(addr_t)&console_subchannel; |
1da177e4 LT |
802 | ret = cio_modify(&console_subchannel); |
803 | if (ret) { | |
6ef556cc | 804 | isc_unregister(CONSOLE_ISC); |
1da177e4 LT |
805 | console_subchannel_in_use = 0; |
806 | return ERR_PTR(ret); | |
807 | } | |
808 | return &console_subchannel; | |
809 | } | |
810 | ||
811 | void | |
812 | cio_release_console(void) | |
813 | { | |
814 | console_subchannel.schib.pmcw.intparm = 0; | |
815 | cio_modify(&console_subchannel); | |
6ef556cc | 816 | isc_unregister(CONSOLE_ISC); |
1da177e4 LT |
817 | console_subchannel_in_use = 0; |
818 | } | |
819 | ||
820 | /* Bah... hack to catch console special sausages. */ | |
821 | int | |
a8237fc4 | 822 | cio_is_console(struct subchannel_id schid) |
1da177e4 LT |
823 | { |
824 | if (!console_subchannel_in_use) | |
825 | return 0; | |
a8237fc4 | 826 | return schid_equal(&schid, &console_subchannel.schid); |
1da177e4 LT |
827 | } |
828 | ||
829 | struct subchannel * | |
830 | cio_get_console_subchannel(void) | |
831 | { | |
832 | if (!console_subchannel_in_use) | |
d2c993d8 | 833 | return NULL; |
1da177e4 LT |
834 | return &console_subchannel; |
835 | } | |
836 | ||
1f4e7eda CH |
837 | const char *cio_get_console_sch_name(struct subchannel_id schid) |
838 | { | |
839 | snprintf(console_sch_name, 10, "0.%x.%04x", schid.ssid, schid.sch_no); | |
840 | return (const char *)console_sch_name; | |
841 | } | |
842 | ||
1da177e4 | 843 | #endif |
4d284cac | 844 | static int |
a8237fc4 | 845 | __disable_subchannel_easy(struct subchannel_id schid, struct schib *schib) |
1da177e4 LT |
846 | { |
847 | int retry, cc; | |
848 | ||
849 | cc = 0; | |
850 | for (retry=0;retry<3;retry++) { | |
851 | schib->pmcw.ena = 0; | |
852 | cc = msch(schid, schib); | |
853 | if (cc) | |
854 | return (cc==3?-ENODEV:-EBUSY); | |
855 | stsch(schid, schib); | |
856 | if (!schib->pmcw.ena) | |
857 | return 0; | |
858 | } | |
859 | return -EBUSY; /* uhm... */ | |
860 | } | |
861 | ||
4d284cac | 862 | static int |
0ae7a7b2 | 863 | __clear_io_subchannel_easy(struct subchannel_id schid) |
1da177e4 LT |
864 | { |
865 | int retry; | |
866 | ||
867 | if (csch(schid)) | |
868 | return -ENODEV; | |
869 | for (retry=0;retry<20;retry++) { | |
870 | struct tpi_info ti; | |
871 | ||
872 | if (tpi(&ti)) { | |
a8237fc4 CH |
873 | tsch(ti.schid, (struct irb *)__LC_IRB); |
874 | if (schid_equal(&ti.schid, &schid)) | |
4c24da79 | 875 | return 0; |
1da177e4 | 876 | } |
5a0d0e65 | 877 | udelay_simple(100); |
1da177e4 LT |
878 | } |
879 | return -EBUSY; | |
880 | } | |
881 | ||
9d92a7e1 CH |
882 | static void __clear_chsc_subchannel_easy(void) |
883 | { | |
884 | /* It seems we can only wait for a bit here :/ */ | |
5a0d0e65 | 885 | udelay_simple(100); |
9d92a7e1 CH |
886 | } |
887 | ||
a45e1414 MH |
888 | static int pgm_check_occured; |
889 | ||
890 | static void cio_reset_pgm_check_handler(void) | |
891 | { | |
892 | pgm_check_occured = 1; | |
893 | } | |
894 | ||
f9c9fe3e | 895 | static int stsch_reset(struct subchannel_id schid, struct schib *addr) |
a45e1414 MH |
896 | { |
897 | int rc; | |
898 | ||
899 | pgm_check_occured = 0; | |
ab14de6c | 900 | s390_base_pgm_handler_fn = cio_reset_pgm_check_handler; |
6faf4444 | 901 | rc = stsch(schid, addr); |
ab14de6c | 902 | s390_base_pgm_handler_fn = NULL; |
aa77015c | 903 | |
ab14de6c | 904 | /* The program check handler could have changed pgm_check_occured. */ |
6faf4444 | 905 | barrier(); |
aa77015c | 906 | |
a45e1414 MH |
907 | if (pgm_check_occured) |
908 | return -EIO; | |
909 | else | |
910 | return rc; | |
911 | } | |
912 | ||
15e9b586 | 913 | static int __shutdown_subchannel_easy(struct subchannel_id schid, void *data) |
f97a56fb CH |
914 | { |
915 | struct schib schib; | |
916 | ||
a45e1414 | 917 | if (stsch_reset(schid, &schib)) |
f97a56fb CH |
918 | return -ENXIO; |
919 | if (!schib.pmcw.ena) | |
920 | return 0; | |
921 | switch(__disable_subchannel_easy(schid, &schib)) { | |
922 | case 0: | |
923 | case -ENODEV: | |
924 | break; | |
925 | default: /* -EBUSY */ | |
0ae7a7b2 CH |
926 | switch (schib.pmcw.st) { |
927 | case SUBCHANNEL_TYPE_IO: | |
928 | if (__clear_io_subchannel_easy(schid)) | |
929 | goto out; /* give up... */ | |
930 | break; | |
9d92a7e1 CH |
931 | case SUBCHANNEL_TYPE_CHSC: |
932 | __clear_chsc_subchannel_easy(); | |
933 | break; | |
0ae7a7b2 CH |
934 | default: |
935 | /* No default clear strategy */ | |
936 | break; | |
937 | } | |
f97a56fb CH |
938 | stsch(schid, &schib); |
939 | __disable_subchannel_easy(schid, &schib); | |
940 | } | |
0ae7a7b2 | 941 | out: |
f97a56fb CH |
942 | return 0; |
943 | } | |
1da177e4 | 944 | |
15e9b586 HC |
945 | static atomic_t chpid_reset_count; |
946 | ||
947 | static void s390_reset_chpids_mcck_handler(void) | |
948 | { | |
949 | struct crw crw; | |
950 | struct mci *mci; | |
951 | ||
952 | /* Check for pending channel report word. */ | |
953 | mci = (struct mci *)&S390_lowcore.mcck_interruption_code; | |
954 | if (!mci->cp) | |
955 | return; | |
956 | /* Process channel report words. */ | |
957 | while (stcrw(&crw) == 0) { | |
958 | /* Check for responses to RCHP. */ | |
959 | if (crw.slct && crw.rsc == CRW_RSC_CPATH) | |
960 | atomic_dec(&chpid_reset_count); | |
961 | } | |
962 | } | |
963 | ||
964 | #define RCHP_TIMEOUT (30 * USEC_PER_SEC) | |
965 | static void css_reset(void) | |
966 | { | |
967 | int i, ret; | |
968 | unsigned long long timeout; | |
f86635fa | 969 | struct chp_id chpid; |
15e9b586 HC |
970 | |
971 | /* Reset subchannels. */ | |
972 | for_each_subchannel(__shutdown_subchannel_easy, NULL); | |
973 | /* Reset channel paths. */ | |
ab14de6c | 974 | s390_base_mcck_handler_fn = s390_reset_chpids_mcck_handler; |
15e9b586 HC |
975 | /* Enable channel report machine checks. */ |
976 | __ctl_set_bit(14, 28); | |
977 | /* Temporarily reenable machine checks. */ | |
978 | local_mcck_enable(); | |
f86635fa | 979 | chp_id_init(&chpid); |
15e9b586 | 980 | for (i = 0; i <= __MAX_CHPID; i++) { |
f86635fa PO |
981 | chpid.id = i; |
982 | ret = rchp(chpid); | |
15e9b586 HC |
983 | if ((ret == 0) || (ret == 2)) |
984 | /* | |
985 | * rchp either succeeded, or another rchp is already | |
986 | * in progress. In either case, we'll get a crw. | |
987 | */ | |
988 | atomic_inc(&chpid_reset_count); | |
989 | } | |
990 | /* Wait for machine check for all channel paths. */ | |
991 | timeout = get_clock() + (RCHP_TIMEOUT << 12); | |
992 | while (atomic_read(&chpid_reset_count) != 0) { | |
993 | if (get_clock() > timeout) | |
994 | break; | |
995 | cpu_relax(); | |
996 | } | |
997 | /* Disable machine checks again. */ | |
998 | local_mcck_disable(); | |
999 | /* Disable channel report machine checks. */ | |
1000 | __ctl_clear_bit(14, 28); | |
ab14de6c | 1001 | s390_base_mcck_handler_fn = NULL; |
15e9b586 HC |
1002 | } |
1003 | ||
1004 | static struct reset_call css_reset_call = { | |
1005 | .fn = css_reset, | |
1006 | }; | |
1007 | ||
1008 | static int __init init_css_reset_call(void) | |
1009 | { | |
1010 | atomic_set(&chpid_reset_count, 0); | |
1011 | register_reset_call(&css_reset_call); | |
1012 | return 0; | |
1013 | } | |
1014 | ||
1015 | arch_initcall(init_css_reset_call); | |
1016 | ||
1017 | struct sch_match_id { | |
1018 | struct subchannel_id schid; | |
1019 | struct ccw_dev_id devid; | |
1020 | int rc; | |
1021 | }; | |
1022 | ||
1023 | static int __reipl_subchannel_match(struct subchannel_id schid, void *data) | |
1024 | { | |
1025 | struct schib schib; | |
1026 | struct sch_match_id *match_id = data; | |
1027 | ||
a45e1414 | 1028 | if (stsch_reset(schid, &schib)) |
15e9b586 | 1029 | return -ENXIO; |
b279a4f5 | 1030 | if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv && |
15e9b586 HC |
1031 | (schib.pmcw.dev == match_id->devid.devno) && |
1032 | (schid.ssid == match_id->devid.ssid)) { | |
1033 | match_id->schid = schid; | |
1034 | match_id->rc = 0; | |
1035 | return 1; | |
1036 | } | |
1037 | return 0; | |
1038 | } | |
1039 | ||
1040 | static int reipl_find_schid(struct ccw_dev_id *devid, | |
1041 | struct subchannel_id *schid) | |
1da177e4 | 1042 | { |
ff6b8ea6 MH |
1043 | struct sch_match_id match_id; |
1044 | ||
1045 | match_id.devid = *devid; | |
1046 | match_id.rc = -ENODEV; | |
15e9b586 | 1047 | for_each_subchannel(__reipl_subchannel_match, &match_id); |
ff6b8ea6 MH |
1048 | if (match_id.rc == 0) |
1049 | *schid = match_id.schid; | |
1050 | return match_id.rc; | |
1da177e4 LT |
1051 | } |
1052 | ||
ff6b8ea6 MH |
1053 | extern void do_reipl_asm(__u32 schid); |
1054 | ||
1da177e4 | 1055 | /* Make sure all subchannels are quiet before we re-ipl an lpar. */ |
ff6b8ea6 | 1056 | void reipl_ccw_dev(struct ccw_dev_id *devid) |
1da177e4 | 1057 | { |
ff6b8ea6 MH |
1058 | struct subchannel_id schid; |
1059 | ||
15e9b586 HC |
1060 | s390_reset_system(); |
1061 | if (reipl_find_schid(devid, &schid) != 0) | |
ff6b8ea6 | 1062 | panic("IPL Device not found\n"); |
ff6b8ea6 | 1063 | do_reipl_asm(*((__u32*)&schid)); |
1da177e4 | 1064 | } |
e87bfe51 | 1065 | |
6fc321fd | 1066 | int __init cio_get_iplinfo(struct cio_iplinfo *iplinfo) |
e87bfe51 HC |
1067 | { |
1068 | struct subchannel_id schid; | |
6fc321fd | 1069 | struct schib schib; |
e87bfe51 HC |
1070 | |
1071 | schid = *(struct subchannel_id *)__LC_SUBCHANNEL_ID; | |
1072 | if (!schid.one) | |
6fc321fd HC |
1073 | return -ENODEV; |
1074 | if (stsch(schid, &schib)) | |
1075 | return -ENODEV; | |
b279a4f5 CH |
1076 | if (schib.pmcw.st != SUBCHANNEL_TYPE_IO) |
1077 | return -ENODEV; | |
6fc321fd HC |
1078 | if (!schib.pmcw.dnv) |
1079 | return -ENODEV; | |
1080 | iplinfo->devno = schib.pmcw.dev; | |
1081 | iplinfo->is_qdio = schib.pmcw.qf; | |
1082 | return 0; | |
e87bfe51 | 1083 | } |
83262d63 PO |
1084 | |
1085 | /** | |
1086 | * cio_tm_start_key - perform start function | |
1087 | * @sch: subchannel on which to perform the start function | |
1088 | * @tcw: transport-command word to be started | |
1089 | * @lpm: mask of paths to use | |
1090 | * @key: storage key to use for storage access | |
1091 | * | |
1092 | * Start the tcw on the given subchannel. Return zero on success, non-zero | |
1093 | * otherwise. | |
1094 | */ | |
1095 | int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key) | |
1096 | { | |
1097 | int cc; | |
1098 | union orb *orb = &to_io_private(sch)->orb; | |
1099 | ||
1100 | memset(orb, 0, sizeof(union orb)); | |
1101 | orb->tm.intparm = (u32) (addr_t) sch; | |
1102 | orb->tm.key = key >> 4; | |
1103 | orb->tm.b = 1; | |
1104 | orb->tm.lpm = lpm ? lpm : sch->lpm; | |
1105 | orb->tm.tcw = (u32) (addr_t) tcw; | |
1106 | cc = ssch(sch->schid, orb); | |
1107 | switch (cc) { | |
1108 | case 0: | |
1109 | return 0; | |
1110 | case 1: | |
1111 | case 2: | |
1112 | return -EBUSY; | |
1113 | default: | |
1114 | return cio_start_handle_notoper(sch, lpm); | |
1115 | } | |
1116 | } | |
1117 | ||
1118 | /** | |
1119 | * cio_tm_intrg - perform interrogate function | |
1120 | * @sch - subchannel on which to perform the interrogate function | |
1121 | * | |
1122 | * If the specified subchannel is running in transport-mode, perform the | |
1123 | * interrogate function. Return zero on success, non-zero otherwie. | |
1124 | */ | |
1125 | int cio_tm_intrg(struct subchannel *sch) | |
1126 | { | |
1127 | int cc; | |
1128 | ||
1129 | if (!to_io_private(sch)->orb.tm.b) | |
1130 | return -EINVAL; | |
1131 | cc = xsch(sch->schid); | |
1132 | switch (cc) { | |
1133 | case 0: | |
1134 | case 2: | |
1135 | return 0; | |
1136 | case 1: | |
1137 | return -EBUSY; | |
1138 | default: | |
1139 | return -ENODEV; | |
1140 | } | |
1141 | } |