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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * drivers/s390/cio/cio.c | |
3 | * S/390 common I/O routines -- low level i/o calls | |
1da177e4 | 4 | * |
0ae7a7b2 | 5 | * Copyright IBM Corp. 1999,2008 |
1da177e4 | 6 | * Author(s): Ingo Adlung (adlung@de.ibm.com) |
4ce3b30c | 7 | * Cornelia Huck (cornelia.huck@de.ibm.com) |
1da177e4 LT |
8 | * Arnd Bergmann (arndb@de.ibm.com) |
9 | * Martin Schwidefsky (schwidefsky@de.ibm.com) | |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
1da177e4 LT |
13 | #include <linux/init.h> |
14 | #include <linux/slab.h> | |
15 | #include <linux/device.h> | |
16 | #include <linux/kernel_stat.h> | |
17 | #include <linux/interrupt.h> | |
1da177e4 LT |
18 | #include <asm/cio.h> |
19 | #include <asm/delay.h> | |
20 | #include <asm/irq.h> | |
5a489b98 | 21 | #include <asm/irq_regs.h> |
e87bfe51 | 22 | #include <asm/setup.h> |
15e9b586 | 23 | #include <asm/reset.h> |
46b05d26 | 24 | #include <asm/ipl.h> |
e5854a58 | 25 | #include <asm/chpid.h> |
4e8e56c6 | 26 | #include <asm/airq.h> |
43ca5c3a | 27 | #include <asm/cpu.h> |
83262d63 | 28 | #include <asm/fcx.h> |
1da177e4 LT |
29 | #include "cio.h" |
30 | #include "css.h" | |
31 | #include "chsc.h" | |
32 | #include "ioasm.h" | |
cd6b4f27 | 33 | #include "io_sch.h" |
1da177e4 LT |
34 | #include "blacklist.h" |
35 | #include "cio_debug.h" | |
e6b6e10a | 36 | #include "chp.h" |
15e9b586 | 37 | #include "../s390mach.h" |
1da177e4 LT |
38 | |
39 | debug_info_t *cio_debug_msg_id; | |
40 | debug_info_t *cio_debug_trace_id; | |
41 | debug_info_t *cio_debug_crw_id; | |
42 | ||
1da177e4 LT |
43 | /* |
44 | * Function: cio_debug_init | |
bc698bcf CH |
45 | * Initializes three debug logs for common I/O: |
46 | * - cio_msg logs generic cio messages | |
1da177e4 | 47 | * - cio_trace logs the calling of different functions |
bc698bcf | 48 | * - cio_crw logs machine check related cio messages |
1da177e4 | 49 | */ |
bc698bcf | 50 | static int __init cio_debug_init(void) |
1da177e4 | 51 | { |
361f494d | 52 | cio_debug_msg_id = debug_register("cio_msg", 16, 1, 16 * sizeof(long)); |
1da177e4 LT |
53 | if (!cio_debug_msg_id) |
54 | goto out_unregister; | |
bc698bcf CH |
55 | debug_register_view(cio_debug_msg_id, &debug_sprintf_view); |
56 | debug_set_level(cio_debug_msg_id, 2); | |
361f494d | 57 | cio_debug_trace_id = debug_register("cio_trace", 16, 1, 16); |
1da177e4 LT |
58 | if (!cio_debug_trace_id) |
59 | goto out_unregister; | |
bc698bcf CH |
60 | debug_register_view(cio_debug_trace_id, &debug_hex_ascii_view); |
61 | debug_set_level(cio_debug_trace_id, 2); | |
361f494d | 62 | cio_debug_crw_id = debug_register("cio_crw", 16, 1, 16 * sizeof(long)); |
1da177e4 LT |
63 | if (!cio_debug_crw_id) |
64 | goto out_unregister; | |
bc698bcf CH |
65 | debug_register_view(cio_debug_crw_id, &debug_sprintf_view); |
66 | debug_set_level(cio_debug_crw_id, 4); | |
1da177e4 LT |
67 | return 0; |
68 | ||
69 | out_unregister: | |
70 | if (cio_debug_msg_id) | |
bc698bcf | 71 | debug_unregister(cio_debug_msg_id); |
1da177e4 | 72 | if (cio_debug_trace_id) |
bc698bcf | 73 | debug_unregister(cio_debug_trace_id); |
1da177e4 | 74 | if (cio_debug_crw_id) |
bc698bcf | 75 | debug_unregister(cio_debug_crw_id); |
e556bbbd | 76 | printk(KERN_WARNING"cio: could not initialize debugging\n"); |
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); | |
1da177e4 LT |
156 | sprintf(dbf_text, "no%s", sch->dev.bus_id); |
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 CH |
173 | CIO_TRACE_EVENT(4, "stIO"); |
174 | CIO_TRACE_EVENT(4, sch->dev.bus_id); | |
1da177e4 | 175 | |
cd6b4f27 | 176 | orb = &to_io_private(sch)->orb; |
1da177e4 | 177 | /* sch is always under 2G. */ |
83262d63 PO |
178 | orb->cmd.intparm = (u32)(addr_t)sch; |
179 | orb->cmd.fmt = 1; | |
1da177e4 | 180 | |
83262d63 PO |
181 | orb->cmd.pfch = sch->options.prefetch == 0; |
182 | orb->cmd.spnd = sch->options.suspend; | |
183 | orb->cmd.ssic = sch->options.suspend && sch->options.inter; | |
184 | orb->cmd.lpm = (lpm != 0) ? lpm : sch->lpm; | |
347a8dc3 | 185 | #ifdef CONFIG_64BIT |
1da177e4 LT |
186 | /* |
187 | * for 64 bit we always support 64 bit IDAWs with 4k page size only | |
188 | */ | |
83262d63 PO |
189 | orb->cmd.c64 = 1; |
190 | orb->cmd.i2k = 0; | |
1da177e4 | 191 | #endif |
83262d63 | 192 | orb->cmd.key = key >> 4; |
1da177e4 | 193 | /* issue "Start Subchannel" */ |
83262d63 | 194 | orb->cmd.cpa = (__u32) __pa(cpa); |
cd6b4f27 | 195 | ccode = ssch(sch->schid, orb); |
1da177e4 LT |
196 | |
197 | /* process condition code */ | |
cd6b4f27 CH |
198 | sprintf(dbf_txt, "ccode:%d", ccode); |
199 | CIO_TRACE_EVENT(4, dbf_txt); | |
1da177e4 LT |
200 | |
201 | switch (ccode) { | |
202 | case 0: | |
203 | /* | |
204 | * initialize device status information | |
205 | */ | |
23d805b6 | 206 | sch->schib.scsw.cmd.actl |= SCSW_ACTL_START_PEND; |
1da177e4 LT |
207 | return 0; |
208 | case 1: /* status pending */ | |
209 | case 2: /* busy */ | |
210 | return -EBUSY; | |
211 | default: /* device/path not operational */ | |
212 | return cio_start_handle_notoper(sch, lpm); | |
213 | } | |
214 | } | |
215 | ||
216 | int | |
217 | cio_start (struct subchannel *sch, struct ccw1 *cpa, __u8 lpm) | |
218 | { | |
0b642ede | 219 | return cio_start_key(sch, cpa, lpm, PAGE_DEFAULT_KEY); |
1da177e4 LT |
220 | } |
221 | ||
222 | /* | |
223 | * resume suspended I/O operation | |
224 | */ | |
225 | int | |
226 | cio_resume (struct subchannel *sch) | |
227 | { | |
228 | char dbf_txt[15]; | |
229 | int ccode; | |
230 | ||
231 | CIO_TRACE_EVENT (4, "resIO"); | |
232 | CIO_TRACE_EVENT (4, sch->dev.bus_id); | |
233 | ||
a8237fc4 | 234 | ccode = rsch (sch->schid); |
1da177e4 LT |
235 | |
236 | sprintf (dbf_txt, "ccode:%d", ccode); | |
237 | CIO_TRACE_EVENT (4, dbf_txt); | |
238 | ||
239 | switch (ccode) { | |
240 | case 0: | |
23d805b6 | 241 | sch->schib.scsw.cmd.actl |= SCSW_ACTL_RESUME_PEND; |
1da177e4 LT |
242 | return 0; |
243 | case 1: | |
244 | return -EBUSY; | |
245 | case 2: | |
246 | return -EINVAL; | |
247 | default: | |
248 | /* | |
249 | * useless to wait for request completion | |
250 | * as device is no longer operational ! | |
251 | */ | |
252 | return -ENODEV; | |
253 | } | |
254 | } | |
255 | ||
256 | /* | |
257 | * halt I/O operation | |
258 | */ | |
259 | int | |
260 | cio_halt(struct subchannel *sch) | |
261 | { | |
262 | char dbf_txt[15]; | |
263 | int ccode; | |
264 | ||
265 | if (!sch) | |
266 | return -ENODEV; | |
267 | ||
268 | CIO_TRACE_EVENT (2, "haltIO"); | |
269 | CIO_TRACE_EVENT (2, sch->dev.bus_id); | |
270 | ||
271 | /* | |
272 | * Issue "Halt subchannel" and process condition code | |
273 | */ | |
a8237fc4 | 274 | ccode = hsch (sch->schid); |
1da177e4 LT |
275 | |
276 | sprintf (dbf_txt, "ccode:%d", ccode); | |
277 | CIO_TRACE_EVENT (2, dbf_txt); | |
278 | ||
279 | switch (ccode) { | |
280 | case 0: | |
23d805b6 | 281 | sch->schib.scsw.cmd.actl |= SCSW_ACTL_HALT_PEND; |
1da177e4 LT |
282 | return 0; |
283 | case 1: /* status pending */ | |
284 | case 2: /* busy */ | |
285 | return -EBUSY; | |
286 | default: /* device not operational */ | |
287 | return -ENODEV; | |
288 | } | |
289 | } | |
290 | ||
291 | /* | |
292 | * Clear I/O operation | |
293 | */ | |
294 | int | |
295 | cio_clear(struct subchannel *sch) | |
296 | { | |
297 | char dbf_txt[15]; | |
298 | int ccode; | |
299 | ||
300 | if (!sch) | |
301 | return -ENODEV; | |
302 | ||
303 | CIO_TRACE_EVENT (2, "clearIO"); | |
304 | CIO_TRACE_EVENT (2, sch->dev.bus_id); | |
305 | ||
306 | /* | |
307 | * Issue "Clear subchannel" and process condition code | |
308 | */ | |
a8237fc4 | 309 | ccode = csch (sch->schid); |
1da177e4 LT |
310 | |
311 | sprintf (dbf_txt, "ccode:%d", ccode); | |
312 | CIO_TRACE_EVENT (2, dbf_txt); | |
313 | ||
314 | switch (ccode) { | |
315 | case 0: | |
23d805b6 | 316 | sch->schib.scsw.cmd.actl |= SCSW_ACTL_CLEAR_PEND; |
1da177e4 LT |
317 | return 0; |
318 | default: /* device not operational */ | |
319 | return -ENODEV; | |
320 | } | |
321 | } | |
322 | ||
323 | /* | |
324 | * Function: cio_cancel | |
325 | * Issues a "Cancel Subchannel" on the specified subchannel | |
326 | * Note: We don't need any fancy intparms and flags here | |
327 | * since xsch is executed synchronously. | |
328 | * Only for common I/O internal use as for now. | |
329 | */ | |
330 | int | |
331 | cio_cancel (struct subchannel *sch) | |
332 | { | |
333 | char dbf_txt[15]; | |
334 | int ccode; | |
335 | ||
336 | if (!sch) | |
337 | return -ENODEV; | |
338 | ||
339 | CIO_TRACE_EVENT (2, "cancelIO"); | |
340 | CIO_TRACE_EVENT (2, sch->dev.bus_id); | |
341 | ||
a8237fc4 | 342 | ccode = xsch (sch->schid); |
1da177e4 LT |
343 | |
344 | sprintf (dbf_txt, "ccode:%d", ccode); | |
345 | CIO_TRACE_EVENT (2, dbf_txt); | |
346 | ||
347 | switch (ccode) { | |
348 | case 0: /* success */ | |
349 | /* Update information in scsw. */ | |
a8237fc4 | 350 | stsch (sch->schid, &sch->schib); |
1da177e4 LT |
351 | return 0; |
352 | case 1: /* status pending */ | |
353 | return -EBUSY; | |
354 | case 2: /* not applicable */ | |
355 | return -EINVAL; | |
356 | default: /* not oper */ | |
357 | return -ENODEV; | |
358 | } | |
359 | } | |
360 | ||
361 | /* | |
362 | * Function: cio_modify | |
363 | * Issues a "Modify Subchannel" on the specified subchannel | |
364 | */ | |
365 | int | |
366 | cio_modify (struct subchannel *sch) | |
367 | { | |
368 | int ccode, retry, ret; | |
369 | ||
370 | ret = 0; | |
371 | for (retry = 0; retry < 5; retry++) { | |
a8237fc4 | 372 | ccode = msch_err (sch->schid, &sch->schib); |
1da177e4 LT |
373 | if (ccode < 0) /* -EIO if msch gets a program check. */ |
374 | return ccode; | |
375 | switch (ccode) { | |
376 | case 0: /* successfull */ | |
377 | return 0; | |
378 | case 1: /* status pending */ | |
379 | return -EBUSY; | |
380 | case 2: /* busy */ | |
381 | udelay (100); /* allow for recovery */ | |
382 | ret = -EBUSY; | |
383 | break; | |
384 | case 3: /* not operational */ | |
385 | return -ENODEV; | |
386 | } | |
387 | } | |
388 | return ret; | |
389 | } | |
390 | ||
44a1c19e CH |
391 | /** |
392 | * cio_enable_subchannel - enable a subchannel. | |
393 | * @sch: subchannel to be enabled | |
394 | * @intparm: interruption parameter to set | |
1da177e4 | 395 | */ |
edf22096 | 396 | int cio_enable_subchannel(struct subchannel *sch, u32 intparm) |
1da177e4 LT |
397 | { |
398 | char dbf_txt[15]; | |
399 | int ccode; | |
400 | int retry; | |
401 | int ret; | |
402 | ||
403 | CIO_TRACE_EVENT (2, "ensch"); | |
404 | CIO_TRACE_EVENT (2, sch->dev.bus_id); | |
405 | ||
d7b5a4c9 CH |
406 | if (sch_is_pseudo_sch(sch)) |
407 | return -EINVAL; | |
a8237fc4 | 408 | ccode = stsch (sch->schid, &sch->schib); |
1da177e4 LT |
409 | if (ccode) |
410 | return -ENODEV; | |
411 | ||
412 | for (retry = 5, ret = 0; retry > 0; retry--) { | |
413 | sch->schib.pmcw.ena = 1; | |
edf22096 | 414 | sch->schib.pmcw.isc = sch->isc; |
b279a4f5 | 415 | sch->schib.pmcw.intparm = intparm; |
1da177e4 LT |
416 | ret = cio_modify(sch); |
417 | if (ret == -ENODEV) | |
418 | break; | |
419 | if (ret == -EIO) | |
420 | /* | |
421 | * Got a program check in cio_modify. Try without | |
422 | * the concurrent sense bit the next time. | |
423 | */ | |
424 | sch->schib.pmcw.csense = 0; | |
425 | if (ret == 0) { | |
a8237fc4 | 426 | stsch (sch->schid, &sch->schib); |
1da177e4 LT |
427 | if (sch->schib.pmcw.ena) |
428 | break; | |
429 | } | |
430 | if (ret == -EBUSY) { | |
431 | struct irb irb; | |
a8237fc4 | 432 | if (tsch(sch->schid, &irb) != 0) |
1da177e4 LT |
433 | break; |
434 | } | |
435 | } | |
436 | sprintf (dbf_txt, "ret:%d", ret); | |
437 | CIO_TRACE_EVENT (2, dbf_txt); | |
438 | return ret; | |
439 | } | |
44a1c19e | 440 | EXPORT_SYMBOL_GPL(cio_enable_subchannel); |
1da177e4 | 441 | |
44a1c19e CH |
442 | /** |
443 | * cio_disable_subchannel - disable a subchannel. | |
444 | * @sch: subchannel to disable | |
1da177e4 | 445 | */ |
44a1c19e | 446 | int cio_disable_subchannel(struct subchannel *sch) |
1da177e4 LT |
447 | { |
448 | char dbf_txt[15]; | |
449 | int ccode; | |
450 | int retry; | |
451 | int ret; | |
452 | ||
453 | CIO_TRACE_EVENT (2, "dissch"); | |
454 | CIO_TRACE_EVENT (2, sch->dev.bus_id); | |
455 | ||
d7b5a4c9 CH |
456 | if (sch_is_pseudo_sch(sch)) |
457 | return 0; | |
a8237fc4 | 458 | ccode = stsch (sch->schid, &sch->schib); |
1da177e4 LT |
459 | if (ccode == 3) /* Not operational. */ |
460 | return -ENODEV; | |
461 | ||
23d805b6 | 462 | if (scsw_actl(&sch->schib.scsw) != 0) |
1da177e4 LT |
463 | /* |
464 | * the disable function must not be called while there are | |
465 | * requests pending for completion ! | |
466 | */ | |
467 | return -EBUSY; | |
468 | ||
469 | for (retry = 5, ret = 0; retry > 0; retry--) { | |
470 | sch->schib.pmcw.ena = 0; | |
471 | ret = cio_modify(sch); | |
472 | if (ret == -ENODEV) | |
473 | break; | |
474 | if (ret == -EBUSY) | |
475 | /* | |
476 | * The subchannel is busy or status pending. | |
477 | * We'll disable when the next interrupt was delivered | |
478 | * via the state machine. | |
479 | */ | |
480 | break; | |
481 | if (ret == 0) { | |
a8237fc4 | 482 | stsch (sch->schid, &sch->schib); |
1da177e4 LT |
483 | if (!sch->schib.pmcw.ena) |
484 | break; | |
485 | } | |
486 | } | |
487 | sprintf (dbf_txt, "ret:%d", ret); | |
488 | CIO_TRACE_EVENT (2, dbf_txt); | |
489 | return ret; | |
490 | } | |
44a1c19e | 491 | EXPORT_SYMBOL_GPL(cio_disable_subchannel); |
1da177e4 | 492 | |
d7b5a4c9 | 493 | int cio_create_sch_lock(struct subchannel *sch) |
2ec22984 CH |
494 | { |
495 | sch->lock = kmalloc(sizeof(spinlock_t), GFP_KERNEL); | |
496 | if (!sch->lock) | |
497 | return -ENOMEM; | |
498 | spin_lock_init(sch->lock); | |
499 | return 0; | |
500 | } | |
501 | ||
b3a686f4 | 502 | static int cio_check_devno_blacklisted(struct subchannel *sch) |
0ae7a7b2 | 503 | { |
0ae7a7b2 CH |
504 | if (is_blacklisted(sch->schid.ssid, sch->schib.pmcw.dev)) { |
505 | /* | |
506 | * This device must not be known to Linux. So we simply | |
507 | * say that there is no device and return ENODEV. | |
508 | */ | |
509 | CIO_MSG_EVENT(6, "Blacklisted device detected " | |
510 | "at devno %04X, subchannel set %x\n", | |
511 | sch->schib.pmcw.dev, sch->schid.ssid); | |
512 | return -ENODEV; | |
513 | } | |
514 | return 0; | |
515 | } | |
516 | ||
b3a686f4 CH |
517 | static int cio_validate_io_subchannel(struct subchannel *sch) |
518 | { | |
519 | /* Initialization for io subchannels. */ | |
520 | if (!css_sch_is_valid(&sch->schib)) | |
521 | return -ENODEV; | |
522 | ||
523 | /* Devno is valid. */ | |
524 | return cio_check_devno_blacklisted(sch); | |
525 | } | |
526 | ||
527 | static int cio_validate_msg_subchannel(struct subchannel *sch) | |
528 | { | |
529 | /* Initialization for message subchannels. */ | |
530 | if (!css_sch_is_valid(&sch->schib)) | |
531 | return -ENODEV; | |
532 | ||
533 | /* Devno is valid. */ | |
534 | return cio_check_devno_blacklisted(sch); | |
535 | } | |
536 | ||
0ae7a7b2 CH |
537 | /** |
538 | * cio_validate_subchannel - basic validation of subchannel | |
539 | * @sch: subchannel structure to be filled out | |
540 | * @schid: subchannel id | |
1da177e4 LT |
541 | * |
542 | * Find out subchannel type and initialize struct subchannel. | |
543 | * Return codes: | |
0ae7a7b2 | 544 | * 0 on success |
1da177e4 | 545 | * -ENXIO for non-defined subchannels |
0ae7a7b2 CH |
546 | * -ENODEV for invalid subchannels or blacklisted devices |
547 | * -EIO for subchannels in an invalid subchannel set | |
1da177e4 | 548 | */ |
0ae7a7b2 | 549 | int cio_validate_subchannel(struct subchannel *sch, struct subchannel_id schid) |
1da177e4 LT |
550 | { |
551 | char dbf_txt[15]; | |
552 | int ccode; | |
2ec22984 | 553 | int err; |
1da177e4 | 554 | |
0ae7a7b2 CH |
555 | sprintf(dbf_txt, "valsch%x", schid.sch_no); |
556 | CIO_TRACE_EVENT(4, dbf_txt); | |
1da177e4 LT |
557 | |
558 | /* Nuke all fields. */ | |
559 | memset(sch, 0, sizeof(struct subchannel)); | |
560 | ||
2ec22984 CH |
561 | sch->schid = schid; |
562 | if (cio_is_console(schid)) { | |
563 | sch->lock = cio_get_console_lock(); | |
564 | } else { | |
565 | err = cio_create_sch_lock(sch); | |
566 | if (err) | |
567 | goto out; | |
568 | } | |
6ab4879a | 569 | mutex_init(&sch->reg_mutex); |
1da177e4 | 570 | /* Set a name for the subchannel */ |
fb6958a5 CH |
571 | snprintf (sch->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x", schid.ssid, |
572 | schid.sch_no); | |
1da177e4 LT |
573 | |
574 | /* | |
575 | * The first subchannel that is not-operational (ccode==3) | |
576 | * indicates that there aren't any more devices available. | |
fb6958a5 CH |
577 | * If stsch gets an exception, it means the current subchannel set |
578 | * is not valid. | |
1da177e4 | 579 | */ |
fb6958a5 | 580 | ccode = stsch_err (schid, &sch->schib); |
2ec22984 CH |
581 | if (ccode) { |
582 | err = (ccode == 3) ? -ENXIO : ccode; | |
583 | goto out; | |
584 | } | |
1da177e4 LT |
585 | /* Copy subchannel type from path management control word. */ |
586 | sch->st = sch->schib.pmcw.st; | |
c820de39 | 587 | |
0ae7a7b2 CH |
588 | switch (sch->st) { |
589 | case SUBCHANNEL_TYPE_IO: | |
590 | err = cio_validate_io_subchannel(sch); | |
591 | break; | |
b3a686f4 CH |
592 | case SUBCHANNEL_TYPE_MSG: |
593 | err = cio_validate_msg_subchannel(sch); | |
594 | break; | |
0ae7a7b2 CH |
595 | default: |
596 | err = 0; | |
1da177e4 | 597 | } |
0ae7a7b2 | 598 | if (err) |
808e4888 | 599 | goto out; |
808e4888 | 600 | |
0ae7a7b2 CH |
601 | CIO_MSG_EVENT(4, "Subchannel 0.%x.%04x reports subchannel type %04X\n", |
602 | sch->schid.ssid, sch->schid.sch_no, sch->st); | |
1da177e4 | 603 | return 0; |
2ec22984 CH |
604 | out: |
605 | if (!cio_is_console(schid)) | |
606 | kfree(sch->lock); | |
607 | sch->lock = NULL; | |
608 | return err; | |
1da177e4 LT |
609 | } |
610 | ||
611 | /* | |
612 | * do_IRQ() handles all normal I/O device IRQ's (the special | |
613 | * SMP cross-CPU interrupts have their own specific | |
614 | * handlers). | |
615 | * | |
616 | */ | |
617 | void | |
618 | do_IRQ (struct pt_regs *regs) | |
619 | { | |
620 | struct tpi_info *tpi_info; | |
621 | struct subchannel *sch; | |
622 | struct irb *irb; | |
5a489b98 | 623 | struct pt_regs *old_regs; |
1da177e4 | 624 | |
5a489b98 | 625 | old_regs = set_irq_regs(regs); |
9d0a57cb | 626 | irq_enter(); |
43ca5c3a | 627 | s390_idle_check(); |
5a62b192 HC |
628 | if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator) |
629 | /* Serve timer interrupts first. */ | |
630 | clock_comparator_work(); | |
1da177e4 LT |
631 | /* |
632 | * Get interrupt information from lowcore | |
633 | */ | |
634 | tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID; | |
635 | irb = (struct irb *) __LC_IRB; | |
636 | do { | |
637 | kstat_cpu(smp_processor_id()).irqs[IO_INTERRUPT]++; | |
638 | /* | |
639 | * Non I/O-subchannel thin interrupts are processed differently | |
640 | */ | |
641 | if (tpi_info->adapter_IO == 1 && | |
642 | tpi_info->int_type == IO_INTERRUPT_TYPE) { | |
643 | do_adapter_IO(); | |
644 | continue; | |
645 | } | |
646 | sch = (struct subchannel *)(unsigned long)tpi_info->intparm; | |
a806170e HC |
647 | if (!sch) { |
648 | /* Clear pending interrupt condition. */ | |
649 | tsch(tpi_info->schid, irb); | |
650 | continue; | |
651 | } | |
652 | spin_lock(sch->lock); | |
1da177e4 | 653 | /* Store interrupt response block to lowcore. */ |
a806170e | 654 | if (tsch(tpi_info->schid, irb) == 0) { |
1da177e4 LT |
655 | /* Keep subchannel information word up to date. */ |
656 | memcpy (&sch->schib.scsw, &irb->scsw, | |
657 | sizeof (irb->scsw)); | |
658 | /* Call interrupt handler if there is one. */ | |
659 | if (sch->driver && sch->driver->irq) | |
602b20f2 | 660 | sch->driver->irq(sch); |
1da177e4 | 661 | } |
a806170e | 662 | spin_unlock(sch->lock); |
1da177e4 LT |
663 | /* |
664 | * Are more interrupts pending? | |
665 | * If so, the tpi instruction will update the lowcore | |
666 | * to hold the info for the next interrupt. | |
667 | * We don't do this for VM because a tpi drops the cpu | |
668 | * out of the sie which costs more cycles than it saves. | |
669 | */ | |
670 | } while (!MACHINE_IS_VM && tpi (NULL) != 0); | |
9d0a57cb | 671 | irq_exit(); |
5a489b98 | 672 | set_irq_regs(old_regs); |
1da177e4 LT |
673 | } |
674 | ||
675 | #ifdef CONFIG_CCW_CONSOLE | |
676 | static struct subchannel console_subchannel; | |
cd6b4f27 | 677 | static struct io_subchannel_private console_priv; |
1da177e4 LT |
678 | static int console_subchannel_in_use; |
679 | ||
cd6b4f27 CH |
680 | void *cio_get_console_priv(void) |
681 | { | |
682 | return &console_priv; | |
683 | } | |
684 | ||
1da177e4 LT |
685 | /* |
686 | * busy wait for the next interrupt on the console | |
687 | */ | |
a806170e HC |
688 | void wait_cons_dev(void) |
689 | __releases(console_subchannel.lock) | |
690 | __acquires(console_subchannel.lock) | |
1da177e4 LT |
691 | { |
692 | unsigned long cr6 __attribute__ ((aligned (8))); | |
693 | unsigned long save_cr6 __attribute__ ((aligned (8))); | |
694 | ||
695 | /* | |
696 | * before entering the spinlock we may already have | |
697 | * processed the interrupt on a different CPU... | |
698 | */ | |
699 | if (!console_subchannel_in_use) | |
700 | return; | |
701 | ||
85b0d7c0 | 702 | /* disable all but isc 1 (console device) */ |
1da177e4 | 703 | __ctl_store (save_cr6, 6, 6); |
85b0d7c0 | 704 | cr6 = 0x40000000; |
1da177e4 LT |
705 | __ctl_load (cr6, 6, 6); |
706 | ||
707 | do { | |
2ec22984 | 708 | spin_unlock(console_subchannel.lock); |
1da177e4 LT |
709 | if (!cio_tpi()) |
710 | cpu_relax(); | |
2ec22984 | 711 | spin_lock(console_subchannel.lock); |
23d805b6 | 712 | } while (console_subchannel.schib.scsw.cmd.actl != 0); |
1da177e4 LT |
713 | /* |
714 | * restore previous isc value | |
715 | */ | |
716 | __ctl_load (save_cr6, 6, 6); | |
717 | } | |
718 | ||
719 | static int | |
f97a56fb CH |
720 | cio_test_for_console(struct subchannel_id schid, void *data) |
721 | { | |
fb6958a5 | 722 | if (stsch_err(schid, &console_subchannel.schib) != 0) |
f97a56fb | 723 | return -ENXIO; |
b279a4f5 CH |
724 | if ((console_subchannel.schib.pmcw.st == SUBCHANNEL_TYPE_IO) && |
725 | console_subchannel.schib.pmcw.dnv && | |
726 | (console_subchannel.schib.pmcw.dev == console_devno)) { | |
f97a56fb CH |
727 | console_irq = schid.sch_no; |
728 | return 1; /* found */ | |
729 | } | |
730 | return 0; | |
731 | } | |
732 | ||
733 | ||
734 | static int | |
735 | cio_get_console_sch_no(void) | |
1da177e4 | 736 | { |
a8237fc4 | 737 | struct subchannel_id schid; |
1da177e4 | 738 | |
a8237fc4 | 739 | init_subchannel_id(&schid); |
1da177e4 LT |
740 | if (console_irq != -1) { |
741 | /* VM provided us with the irq number of the console. */ | |
a8237fc4 CH |
742 | schid.sch_no = console_irq; |
743 | if (stsch(schid, &console_subchannel.schib) != 0 || | |
b279a4f5 | 744 | (console_subchannel.schib.pmcw.st != SUBCHANNEL_TYPE_IO) || |
1da177e4 LT |
745 | !console_subchannel.schib.pmcw.dnv) |
746 | return -1; | |
747 | console_devno = console_subchannel.schib.pmcw.dev; | |
748 | } else if (console_devno != -1) { | |
749 | /* At least the console device number is known. */ | |
f97a56fb | 750 | for_each_subchannel(cio_test_for_console, NULL); |
1da177e4 LT |
751 | if (console_irq == -1) |
752 | return -1; | |
753 | } else { | |
754 | /* unlike in 2.4, we cannot autoprobe here, since | |
755 | * the channel subsystem is not fully initialized. | |
756 | * With some luck, the HWC console can take over */ | |
e556bbbd | 757 | printk(KERN_WARNING "cio: No ccw console found!\n"); |
1da177e4 LT |
758 | return -1; |
759 | } | |
760 | return console_irq; | |
761 | } | |
762 | ||
763 | struct subchannel * | |
764 | cio_probe_console(void) | |
765 | { | |
f97a56fb | 766 | int sch_no, ret; |
a8237fc4 | 767 | struct subchannel_id schid; |
1da177e4 LT |
768 | |
769 | if (xchg(&console_subchannel_in_use, 1) != 0) | |
770 | return ERR_PTR(-EBUSY); | |
f97a56fb CH |
771 | sch_no = cio_get_console_sch_no(); |
772 | if (sch_no == -1) { | |
1da177e4 LT |
773 | console_subchannel_in_use = 0; |
774 | return ERR_PTR(-ENODEV); | |
775 | } | |
776 | memset(&console_subchannel, 0, sizeof(struct subchannel)); | |
a8237fc4 | 777 | init_subchannel_id(&schid); |
f97a56fb | 778 | schid.sch_no = sch_no; |
a8237fc4 | 779 | ret = cio_validate_subchannel(&console_subchannel, schid); |
1da177e4 LT |
780 | if (ret) { |
781 | console_subchannel_in_use = 0; | |
782 | return ERR_PTR(-ENODEV); | |
783 | } | |
784 | ||
785 | /* | |
85b0d7c0 | 786 | * enable console I/O-interrupt subclass 1 |
1da177e4 | 787 | */ |
85b0d7c0 | 788 | ctl_set_bit(6, 30); |
85b0d7c0 | 789 | console_subchannel.schib.pmcw.isc = 1; |
1da177e4 | 790 | console_subchannel.schib.pmcw.intparm = |
cd6b4f27 | 791 | (u32)(addr_t)&console_subchannel; |
1da177e4 LT |
792 | ret = cio_modify(&console_subchannel); |
793 | if (ret) { | |
794 | console_subchannel_in_use = 0; | |
795 | return ERR_PTR(ret); | |
796 | } | |
797 | return &console_subchannel; | |
798 | } | |
799 | ||
800 | void | |
801 | cio_release_console(void) | |
802 | { | |
803 | console_subchannel.schib.pmcw.intparm = 0; | |
804 | cio_modify(&console_subchannel); | |
9689b336 | 805 | ctl_clear_bit(6, 30); |
1da177e4 LT |
806 | console_subchannel_in_use = 0; |
807 | } | |
808 | ||
809 | /* Bah... hack to catch console special sausages. */ | |
810 | int | |
a8237fc4 | 811 | cio_is_console(struct subchannel_id schid) |
1da177e4 LT |
812 | { |
813 | if (!console_subchannel_in_use) | |
814 | return 0; | |
a8237fc4 | 815 | return schid_equal(&schid, &console_subchannel.schid); |
1da177e4 LT |
816 | } |
817 | ||
818 | struct subchannel * | |
819 | cio_get_console_subchannel(void) | |
820 | { | |
821 | if (!console_subchannel_in_use) | |
d2c993d8 | 822 | return NULL; |
1da177e4 LT |
823 | return &console_subchannel; |
824 | } | |
825 | ||
826 | #endif | |
4d284cac | 827 | static int |
a8237fc4 | 828 | __disable_subchannel_easy(struct subchannel_id schid, struct schib *schib) |
1da177e4 LT |
829 | { |
830 | int retry, cc; | |
831 | ||
832 | cc = 0; | |
833 | for (retry=0;retry<3;retry++) { | |
834 | schib->pmcw.ena = 0; | |
835 | cc = msch(schid, schib); | |
836 | if (cc) | |
837 | return (cc==3?-ENODEV:-EBUSY); | |
838 | stsch(schid, schib); | |
839 | if (!schib->pmcw.ena) | |
840 | return 0; | |
841 | } | |
842 | return -EBUSY; /* uhm... */ | |
843 | } | |
844 | ||
d54853ef MS |
845 | /* we can't use the normal udelay here, since it enables external interrupts */ |
846 | ||
847 | static void udelay_reset(unsigned long usecs) | |
848 | { | |
849 | uint64_t start_cc, end_cc; | |
850 | ||
851 | asm volatile ("STCK %0" : "=m" (start_cc)); | |
852 | do { | |
853 | cpu_relax(); | |
854 | asm volatile ("STCK %0" : "=m" (end_cc)); | |
855 | } while (((end_cc - start_cc)/4096) < usecs); | |
856 | } | |
857 | ||
4d284cac | 858 | static int |
0ae7a7b2 | 859 | __clear_io_subchannel_easy(struct subchannel_id schid) |
1da177e4 LT |
860 | { |
861 | int retry; | |
862 | ||
863 | if (csch(schid)) | |
864 | return -ENODEV; | |
865 | for (retry=0;retry<20;retry++) { | |
866 | struct tpi_info ti; | |
867 | ||
868 | if (tpi(&ti)) { | |
a8237fc4 CH |
869 | tsch(ti.schid, (struct irb *)__LC_IRB); |
870 | if (schid_equal(&ti.schid, &schid)) | |
4c24da79 | 871 | return 0; |
1da177e4 | 872 | } |
d54853ef | 873 | udelay_reset(100); |
1da177e4 LT |
874 | } |
875 | return -EBUSY; | |
876 | } | |
877 | ||
a45e1414 MH |
878 | static int pgm_check_occured; |
879 | ||
880 | static void cio_reset_pgm_check_handler(void) | |
881 | { | |
882 | pgm_check_occured = 1; | |
883 | } | |
884 | ||
885 | static int stsch_reset(struct subchannel_id schid, volatile struct schib *addr) | |
886 | { | |
887 | int rc; | |
888 | ||
889 | pgm_check_occured = 0; | |
ab14de6c | 890 | s390_base_pgm_handler_fn = cio_reset_pgm_check_handler; |
6faf4444 | 891 | rc = stsch(schid, addr); |
ab14de6c | 892 | s390_base_pgm_handler_fn = NULL; |
aa77015c | 893 | |
ab14de6c | 894 | /* The program check handler could have changed pgm_check_occured. */ |
6faf4444 | 895 | barrier(); |
aa77015c | 896 | |
a45e1414 MH |
897 | if (pgm_check_occured) |
898 | return -EIO; | |
899 | else | |
900 | return rc; | |
901 | } | |
902 | ||
15e9b586 | 903 | static int __shutdown_subchannel_easy(struct subchannel_id schid, void *data) |
f97a56fb CH |
904 | { |
905 | struct schib schib; | |
906 | ||
a45e1414 | 907 | if (stsch_reset(schid, &schib)) |
f97a56fb CH |
908 | return -ENXIO; |
909 | if (!schib.pmcw.ena) | |
910 | return 0; | |
911 | switch(__disable_subchannel_easy(schid, &schib)) { | |
912 | case 0: | |
913 | case -ENODEV: | |
914 | break; | |
915 | default: /* -EBUSY */ | |
0ae7a7b2 CH |
916 | switch (schib.pmcw.st) { |
917 | case SUBCHANNEL_TYPE_IO: | |
918 | if (__clear_io_subchannel_easy(schid)) | |
919 | goto out; /* give up... */ | |
920 | break; | |
921 | default: | |
922 | /* No default clear strategy */ | |
923 | break; | |
924 | } | |
f97a56fb CH |
925 | stsch(schid, &schib); |
926 | __disable_subchannel_easy(schid, &schib); | |
927 | } | |
0ae7a7b2 | 928 | out: |
f97a56fb CH |
929 | return 0; |
930 | } | |
1da177e4 | 931 | |
15e9b586 HC |
932 | static atomic_t chpid_reset_count; |
933 | ||
934 | static void s390_reset_chpids_mcck_handler(void) | |
935 | { | |
936 | struct crw crw; | |
937 | struct mci *mci; | |
938 | ||
939 | /* Check for pending channel report word. */ | |
940 | mci = (struct mci *)&S390_lowcore.mcck_interruption_code; | |
941 | if (!mci->cp) | |
942 | return; | |
943 | /* Process channel report words. */ | |
944 | while (stcrw(&crw) == 0) { | |
945 | /* Check for responses to RCHP. */ | |
946 | if (crw.slct && crw.rsc == CRW_RSC_CPATH) | |
947 | atomic_dec(&chpid_reset_count); | |
948 | } | |
949 | } | |
950 | ||
951 | #define RCHP_TIMEOUT (30 * USEC_PER_SEC) | |
952 | static void css_reset(void) | |
953 | { | |
954 | int i, ret; | |
955 | unsigned long long timeout; | |
f86635fa | 956 | struct chp_id chpid; |
15e9b586 HC |
957 | |
958 | /* Reset subchannels. */ | |
959 | for_each_subchannel(__shutdown_subchannel_easy, NULL); | |
960 | /* Reset channel paths. */ | |
ab14de6c | 961 | s390_base_mcck_handler_fn = s390_reset_chpids_mcck_handler; |
15e9b586 HC |
962 | /* Enable channel report machine checks. */ |
963 | __ctl_set_bit(14, 28); | |
964 | /* Temporarily reenable machine checks. */ | |
965 | local_mcck_enable(); | |
f86635fa | 966 | chp_id_init(&chpid); |
15e9b586 | 967 | for (i = 0; i <= __MAX_CHPID; i++) { |
f86635fa PO |
968 | chpid.id = i; |
969 | ret = rchp(chpid); | |
15e9b586 HC |
970 | if ((ret == 0) || (ret == 2)) |
971 | /* | |
972 | * rchp either succeeded, or another rchp is already | |
973 | * in progress. In either case, we'll get a crw. | |
974 | */ | |
975 | atomic_inc(&chpid_reset_count); | |
976 | } | |
977 | /* Wait for machine check for all channel paths. */ | |
978 | timeout = get_clock() + (RCHP_TIMEOUT << 12); | |
979 | while (atomic_read(&chpid_reset_count) != 0) { | |
980 | if (get_clock() > timeout) | |
981 | break; | |
982 | cpu_relax(); | |
983 | } | |
984 | /* Disable machine checks again. */ | |
985 | local_mcck_disable(); | |
986 | /* Disable channel report machine checks. */ | |
987 | __ctl_clear_bit(14, 28); | |
ab14de6c | 988 | s390_base_mcck_handler_fn = NULL; |
15e9b586 HC |
989 | } |
990 | ||
991 | static struct reset_call css_reset_call = { | |
992 | .fn = css_reset, | |
993 | }; | |
994 | ||
995 | static int __init init_css_reset_call(void) | |
996 | { | |
997 | atomic_set(&chpid_reset_count, 0); | |
998 | register_reset_call(&css_reset_call); | |
999 | return 0; | |
1000 | } | |
1001 | ||
1002 | arch_initcall(init_css_reset_call); | |
1003 | ||
1004 | struct sch_match_id { | |
1005 | struct subchannel_id schid; | |
1006 | struct ccw_dev_id devid; | |
1007 | int rc; | |
1008 | }; | |
1009 | ||
1010 | static int __reipl_subchannel_match(struct subchannel_id schid, void *data) | |
1011 | { | |
1012 | struct schib schib; | |
1013 | struct sch_match_id *match_id = data; | |
1014 | ||
a45e1414 | 1015 | if (stsch_reset(schid, &schib)) |
15e9b586 | 1016 | return -ENXIO; |
b279a4f5 | 1017 | if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv && |
15e9b586 HC |
1018 | (schib.pmcw.dev == match_id->devid.devno) && |
1019 | (schid.ssid == match_id->devid.ssid)) { | |
1020 | match_id->schid = schid; | |
1021 | match_id->rc = 0; | |
1022 | return 1; | |
1023 | } | |
1024 | return 0; | |
1025 | } | |
1026 | ||
1027 | static int reipl_find_schid(struct ccw_dev_id *devid, | |
1028 | struct subchannel_id *schid) | |
1da177e4 | 1029 | { |
ff6b8ea6 MH |
1030 | struct sch_match_id match_id; |
1031 | ||
1032 | match_id.devid = *devid; | |
1033 | match_id.rc = -ENODEV; | |
15e9b586 | 1034 | for_each_subchannel(__reipl_subchannel_match, &match_id); |
ff6b8ea6 MH |
1035 | if (match_id.rc == 0) |
1036 | *schid = match_id.schid; | |
1037 | return match_id.rc; | |
1da177e4 LT |
1038 | } |
1039 | ||
ff6b8ea6 MH |
1040 | extern void do_reipl_asm(__u32 schid); |
1041 | ||
1da177e4 | 1042 | /* Make sure all subchannels are quiet before we re-ipl an lpar. */ |
ff6b8ea6 | 1043 | void reipl_ccw_dev(struct ccw_dev_id *devid) |
1da177e4 | 1044 | { |
ff6b8ea6 MH |
1045 | struct subchannel_id schid; |
1046 | ||
15e9b586 HC |
1047 | s390_reset_system(); |
1048 | if (reipl_find_schid(devid, &schid) != 0) | |
ff6b8ea6 | 1049 | panic("IPL Device not found\n"); |
ff6b8ea6 | 1050 | do_reipl_asm(*((__u32*)&schid)); |
1da177e4 | 1051 | } |
e87bfe51 | 1052 | |
6fc321fd | 1053 | int __init cio_get_iplinfo(struct cio_iplinfo *iplinfo) |
e87bfe51 HC |
1054 | { |
1055 | struct subchannel_id schid; | |
6fc321fd | 1056 | struct schib schib; |
e87bfe51 HC |
1057 | |
1058 | schid = *(struct subchannel_id *)__LC_SUBCHANNEL_ID; | |
1059 | if (!schid.one) | |
6fc321fd HC |
1060 | return -ENODEV; |
1061 | if (stsch(schid, &schib)) | |
1062 | return -ENODEV; | |
b279a4f5 CH |
1063 | if (schib.pmcw.st != SUBCHANNEL_TYPE_IO) |
1064 | return -ENODEV; | |
6fc321fd HC |
1065 | if (!schib.pmcw.dnv) |
1066 | return -ENODEV; | |
1067 | iplinfo->devno = schib.pmcw.dev; | |
1068 | iplinfo->is_qdio = schib.pmcw.qf; | |
1069 | return 0; | |
e87bfe51 | 1070 | } |
83262d63 PO |
1071 | |
1072 | /** | |
1073 | * cio_tm_start_key - perform start function | |
1074 | * @sch: subchannel on which to perform the start function | |
1075 | * @tcw: transport-command word to be started | |
1076 | * @lpm: mask of paths to use | |
1077 | * @key: storage key to use for storage access | |
1078 | * | |
1079 | * Start the tcw on the given subchannel. Return zero on success, non-zero | |
1080 | * otherwise. | |
1081 | */ | |
1082 | int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key) | |
1083 | { | |
1084 | int cc; | |
1085 | union orb *orb = &to_io_private(sch)->orb; | |
1086 | ||
1087 | memset(orb, 0, sizeof(union orb)); | |
1088 | orb->tm.intparm = (u32) (addr_t) sch; | |
1089 | orb->tm.key = key >> 4; | |
1090 | orb->tm.b = 1; | |
1091 | orb->tm.lpm = lpm ? lpm : sch->lpm; | |
1092 | orb->tm.tcw = (u32) (addr_t) tcw; | |
1093 | cc = ssch(sch->schid, orb); | |
1094 | switch (cc) { | |
1095 | case 0: | |
1096 | return 0; | |
1097 | case 1: | |
1098 | case 2: | |
1099 | return -EBUSY; | |
1100 | default: | |
1101 | return cio_start_handle_notoper(sch, lpm); | |
1102 | } | |
1103 | } | |
1104 | ||
1105 | /** | |
1106 | * cio_tm_intrg - perform interrogate function | |
1107 | * @sch - subchannel on which to perform the interrogate function | |
1108 | * | |
1109 | * If the specified subchannel is running in transport-mode, perform the | |
1110 | * interrogate function. Return zero on success, non-zero otherwie. | |
1111 | */ | |
1112 | int cio_tm_intrg(struct subchannel *sch) | |
1113 | { | |
1114 | int cc; | |
1115 | ||
1116 | if (!to_io_private(sch)->orb.tm.b) | |
1117 | return -EINVAL; | |
1118 | cc = xsch(sch->schid); | |
1119 | switch (cc) { | |
1120 | case 0: | |
1121 | case 2: | |
1122 | return 0; | |
1123 | case 1: | |
1124 | return -EBUSY; | |
1125 | default: | |
1126 | return -ENODEV; | |
1127 | } | |
1128 | } |