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