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 | ||
e6d5a428 ME |
12 | #define KMSG_COMPONENT "cio" |
13 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
14 | ||
1da177e4 | 15 | #include <linux/module.h> |
1da177e4 LT |
16 | #include <linux/init.h> |
17 | #include <linux/slab.h> | |
18 | #include <linux/device.h> | |
19 | #include <linux/kernel_stat.h> | |
20 | #include <linux/interrupt.h> | |
1da177e4 LT |
21 | #include <asm/cio.h> |
22 | #include <asm/delay.h> | |
23 | #include <asm/irq.h> | |
5a489b98 | 24 | #include <asm/irq_regs.h> |
e87bfe51 | 25 | #include <asm/setup.h> |
15e9b586 | 26 | #include <asm/reset.h> |
46b05d26 | 27 | #include <asm/ipl.h> |
e5854a58 | 28 | #include <asm/chpid.h> |
4e8e56c6 | 29 | #include <asm/airq.h> |
3a3fc29a | 30 | #include <asm/isc.h> |
43ca5c3a | 31 | #include <asm/cpu.h> |
83262d63 | 32 | #include <asm/fcx.h> |
1da177e4 LT |
33 | #include "cio.h" |
34 | #include "css.h" | |
35 | #include "chsc.h" | |
36 | #include "ioasm.h" | |
cd6b4f27 | 37 | #include "io_sch.h" |
1da177e4 LT |
38 | #include "blacklist.h" |
39 | #include "cio_debug.h" | |
e6b6e10a | 40 | #include "chp.h" |
15e9b586 | 41 | #include "../s390mach.h" |
1da177e4 LT |
42 | |
43 | debug_info_t *cio_debug_msg_id; | |
44 | debug_info_t *cio_debug_trace_id; | |
45 | debug_info_t *cio_debug_crw_id; | |
46 | ||
1da177e4 LT |
47 | /* |
48 | * Function: cio_debug_init | |
bc698bcf CH |
49 | * Initializes three debug logs for common I/O: |
50 | * - cio_msg logs generic cio messages | |
1da177e4 | 51 | * - cio_trace logs the calling of different functions |
bc698bcf | 52 | * - cio_crw logs machine check related cio messages |
1da177e4 | 53 | */ |
bc698bcf | 54 | static int __init cio_debug_init(void) |
1da177e4 | 55 | { |
361f494d | 56 | cio_debug_msg_id = debug_register("cio_msg", 16, 1, 16 * sizeof(long)); |
1da177e4 LT |
57 | if (!cio_debug_msg_id) |
58 | goto out_unregister; | |
bc698bcf CH |
59 | debug_register_view(cio_debug_msg_id, &debug_sprintf_view); |
60 | debug_set_level(cio_debug_msg_id, 2); | |
361f494d | 61 | cio_debug_trace_id = debug_register("cio_trace", 16, 1, 16); |
1da177e4 LT |
62 | if (!cio_debug_trace_id) |
63 | goto out_unregister; | |
bc698bcf CH |
64 | debug_register_view(cio_debug_trace_id, &debug_hex_ascii_view); |
65 | debug_set_level(cio_debug_trace_id, 2); | |
361f494d | 66 | cio_debug_crw_id = debug_register("cio_crw", 16, 1, 16 * sizeof(long)); |
1da177e4 LT |
67 | if (!cio_debug_crw_id) |
68 | goto out_unregister; | |
bc698bcf CH |
69 | debug_register_view(cio_debug_crw_id, &debug_sprintf_view); |
70 | debug_set_level(cio_debug_crw_id, 4); | |
1da177e4 LT |
71 | return 0; |
72 | ||
73 | out_unregister: | |
74 | if (cio_debug_msg_id) | |
bc698bcf | 75 | debug_unregister(cio_debug_msg_id); |
1da177e4 | 76 | if (cio_debug_trace_id) |
bc698bcf | 77 | debug_unregister(cio_debug_trace_id); |
1da177e4 | 78 | if (cio_debug_crw_id) |
bc698bcf | 79 | debug_unregister(cio_debug_crw_id); |
1da177e4 LT |
80 | return -1; |
81 | } | |
82 | ||
83 | arch_initcall (cio_debug_init); | |
84 | ||
85 | int | |
86 | cio_set_options (struct subchannel *sch, int flags) | |
87 | { | |
88 | sch->options.suspend = (flags & DOIO_ALLOW_SUSPEND) != 0; | |
89 | sch->options.prefetch = (flags & DOIO_DENY_PREFETCH) != 0; | |
90 | sch->options.inter = (flags & DOIO_SUPPRESS_INTER) != 0; | |
91 | return 0; | |
92 | } | |
93 | ||
94 | /* FIXME: who wants to use this? */ | |
95 | int | |
96 | cio_get_options (struct subchannel *sch) | |
97 | { | |
98 | int flags; | |
99 | ||
100 | flags = 0; | |
101 | if (sch->options.suspend) | |
102 | flags |= DOIO_ALLOW_SUSPEND; | |
103 | if (sch->options.prefetch) | |
104 | flags |= DOIO_DENY_PREFETCH; | |
105 | if (sch->options.inter) | |
106 | flags |= DOIO_SUPPRESS_INTER; | |
107 | return flags; | |
108 | } | |
109 | ||
4d284cac | 110 | static int |
1da177e4 LT |
111 | cio_start_handle_notoper(struct subchannel *sch, __u8 lpm) |
112 | { | |
113 | char dbf_text[15]; | |
114 | ||
115 | if (lpm != 0) | |
116 | sch->lpm &= ~lpm; | |
117 | else | |
118 | sch->lpm = 0; | |
119 | ||
139b83dd | 120 | CIO_MSG_EVENT(2, "cio_start: 'not oper' status for " |
fb6958a5 CH |
121 | "subchannel 0.%x.%04x!\n", sch->schid.ssid, |
122 | sch->schid.sch_no); | |
cdb912a4 SO |
123 | |
124 | if (cio_update_schib(sch)) | |
125 | return -ENODEV; | |
126 | ||
2a0217d5 | 127 | sprintf(dbf_text, "no%s", dev_name(&sch->dev)); |
1da177e4 LT |
128 | CIO_TRACE_EVENT(0, dbf_text); |
129 | CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib)); | |
130 | ||
131 | return (sch->lpm ? -EACCES : -ENODEV); | |
132 | } | |
133 | ||
134 | int | |
135 | cio_start_key (struct subchannel *sch, /* subchannel structure */ | |
136 | struct ccw1 * cpa, /* logical channel prog addr */ | |
137 | __u8 lpm, /* logical path mask */ | |
138 | __u8 key) /* storage key */ | |
139 | { | |
140 | char dbf_txt[15]; | |
141 | int ccode; | |
83262d63 | 142 | union orb *orb; |
1da177e4 | 143 | |
cd6b4f27 | 144 | CIO_TRACE_EVENT(4, "stIO"); |
2a0217d5 | 145 | CIO_TRACE_EVENT(4, dev_name(&sch->dev)); |
1da177e4 | 146 | |
cd6b4f27 | 147 | orb = &to_io_private(sch)->orb; |
9adb8c1d | 148 | memset(orb, 0, sizeof(union orb)); |
1da177e4 | 149 | /* sch is always under 2G. */ |
83262d63 PO |
150 | orb->cmd.intparm = (u32)(addr_t)sch; |
151 | orb->cmd.fmt = 1; | |
1da177e4 | 152 | |
83262d63 PO |
153 | orb->cmd.pfch = sch->options.prefetch == 0; |
154 | orb->cmd.spnd = sch->options.suspend; | |
155 | orb->cmd.ssic = sch->options.suspend && sch->options.inter; | |
156 | orb->cmd.lpm = (lpm != 0) ? lpm : sch->lpm; | |
347a8dc3 | 157 | #ifdef CONFIG_64BIT |
1da177e4 LT |
158 | /* |
159 | * for 64 bit we always support 64 bit IDAWs with 4k page size only | |
160 | */ | |
83262d63 PO |
161 | orb->cmd.c64 = 1; |
162 | orb->cmd.i2k = 0; | |
1da177e4 | 163 | #endif |
83262d63 | 164 | orb->cmd.key = key >> 4; |
1da177e4 | 165 | /* issue "Start Subchannel" */ |
83262d63 | 166 | orb->cmd.cpa = (__u32) __pa(cpa); |
cd6b4f27 | 167 | ccode = ssch(sch->schid, orb); |
1da177e4 LT |
168 | |
169 | /* process condition code */ | |
cd6b4f27 CH |
170 | sprintf(dbf_txt, "ccode:%d", ccode); |
171 | CIO_TRACE_EVENT(4, dbf_txt); | |
1da177e4 LT |
172 | |
173 | switch (ccode) { | |
174 | case 0: | |
175 | /* | |
176 | * initialize device status information | |
177 | */ | |
23d805b6 | 178 | sch->schib.scsw.cmd.actl |= SCSW_ACTL_START_PEND; |
1da177e4 LT |
179 | return 0; |
180 | case 1: /* status pending */ | |
181 | case 2: /* busy */ | |
182 | return -EBUSY; | |
c91ebe49 | 183 | case 3: /* device/path not operational */ |
1da177e4 | 184 | return cio_start_handle_notoper(sch, lpm); |
c91ebe49 CH |
185 | default: |
186 | return ccode; | |
1da177e4 LT |
187 | } |
188 | } | |
189 | ||
190 | int | |
191 | cio_start (struct subchannel *sch, struct ccw1 *cpa, __u8 lpm) | |
192 | { | |
0b642ede | 193 | return cio_start_key(sch, cpa, lpm, PAGE_DEFAULT_KEY); |
1da177e4 LT |
194 | } |
195 | ||
196 | /* | |
197 | * resume suspended I/O operation | |
198 | */ | |
199 | int | |
200 | cio_resume (struct subchannel *sch) | |
201 | { | |
202 | char dbf_txt[15]; | |
203 | int ccode; | |
204 | ||
205 | CIO_TRACE_EVENT (4, "resIO"); | |
2a0217d5 | 206 | CIO_TRACE_EVENT(4, dev_name(&sch->dev)); |
1da177e4 | 207 | |
a8237fc4 | 208 | ccode = rsch (sch->schid); |
1da177e4 LT |
209 | |
210 | sprintf (dbf_txt, "ccode:%d", ccode); | |
211 | CIO_TRACE_EVENT (4, dbf_txt); | |
212 | ||
213 | switch (ccode) { | |
214 | case 0: | |
23d805b6 | 215 | sch->schib.scsw.cmd.actl |= SCSW_ACTL_RESUME_PEND; |
1da177e4 LT |
216 | return 0; |
217 | case 1: | |
218 | return -EBUSY; | |
219 | case 2: | |
220 | return -EINVAL; | |
221 | default: | |
222 | /* | |
223 | * useless to wait for request completion | |
224 | * as device is no longer operational ! | |
225 | */ | |
226 | return -ENODEV; | |
227 | } | |
228 | } | |
229 | ||
230 | /* | |
231 | * halt I/O operation | |
232 | */ | |
233 | int | |
234 | cio_halt(struct subchannel *sch) | |
235 | { | |
236 | char dbf_txt[15]; | |
237 | int ccode; | |
238 | ||
239 | if (!sch) | |
240 | return -ENODEV; | |
241 | ||
242 | CIO_TRACE_EVENT (2, "haltIO"); | |
2a0217d5 | 243 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 LT |
244 | |
245 | /* | |
246 | * Issue "Halt subchannel" and process condition code | |
247 | */ | |
a8237fc4 | 248 | ccode = hsch (sch->schid); |
1da177e4 LT |
249 | |
250 | sprintf (dbf_txt, "ccode:%d", ccode); | |
251 | CIO_TRACE_EVENT (2, dbf_txt); | |
252 | ||
253 | switch (ccode) { | |
254 | case 0: | |
23d805b6 | 255 | sch->schib.scsw.cmd.actl |= SCSW_ACTL_HALT_PEND; |
1da177e4 LT |
256 | return 0; |
257 | case 1: /* status pending */ | |
258 | case 2: /* busy */ | |
259 | return -EBUSY; | |
260 | default: /* device not operational */ | |
261 | return -ENODEV; | |
262 | } | |
263 | } | |
264 | ||
265 | /* | |
266 | * Clear I/O operation | |
267 | */ | |
268 | int | |
269 | cio_clear(struct subchannel *sch) | |
270 | { | |
271 | char dbf_txt[15]; | |
272 | int ccode; | |
273 | ||
274 | if (!sch) | |
275 | return -ENODEV; | |
276 | ||
277 | CIO_TRACE_EVENT (2, "clearIO"); | |
2a0217d5 | 278 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 LT |
279 | |
280 | /* | |
281 | * Issue "Clear subchannel" and process condition code | |
282 | */ | |
a8237fc4 | 283 | ccode = csch (sch->schid); |
1da177e4 LT |
284 | |
285 | sprintf (dbf_txt, "ccode:%d", ccode); | |
286 | CIO_TRACE_EVENT (2, dbf_txt); | |
287 | ||
288 | switch (ccode) { | |
289 | case 0: | |
23d805b6 | 290 | sch->schib.scsw.cmd.actl |= SCSW_ACTL_CLEAR_PEND; |
1da177e4 LT |
291 | return 0; |
292 | default: /* device not operational */ | |
293 | return -ENODEV; | |
294 | } | |
295 | } | |
296 | ||
297 | /* | |
298 | * Function: cio_cancel | |
299 | * Issues a "Cancel Subchannel" on the specified subchannel | |
300 | * Note: We don't need any fancy intparms and flags here | |
301 | * since xsch is executed synchronously. | |
302 | * Only for common I/O internal use as for now. | |
303 | */ | |
304 | int | |
305 | cio_cancel (struct subchannel *sch) | |
306 | { | |
307 | char dbf_txt[15]; | |
308 | int ccode; | |
309 | ||
310 | if (!sch) | |
311 | return -ENODEV; | |
312 | ||
313 | CIO_TRACE_EVENT (2, "cancelIO"); | |
2a0217d5 | 314 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 | 315 | |
a8237fc4 | 316 | ccode = xsch (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: /* success */ | |
323 | /* Update information in scsw. */ | |
cdb912a4 SO |
324 | if (cio_update_schib(sch)) |
325 | return -ENODEV; | |
1da177e4 LT |
326 | return 0; |
327 | case 1: /* status pending */ | |
328 | return -EBUSY; | |
329 | case 2: /* not applicable */ | |
330 | return -EINVAL; | |
331 | default: /* not oper */ | |
332 | return -ENODEV; | |
333 | } | |
334 | } | |
335 | ||
13952ec1 SO |
336 | |
337 | static void cio_apply_config(struct subchannel *sch, struct schib *schib) | |
338 | { | |
339 | schib->pmcw.intparm = sch->config.intparm; | |
340 | schib->pmcw.mbi = sch->config.mbi; | |
341 | schib->pmcw.isc = sch->config.isc; | |
342 | schib->pmcw.ena = sch->config.ena; | |
343 | schib->pmcw.mme = sch->config.mme; | |
344 | schib->pmcw.mp = sch->config.mp; | |
345 | schib->pmcw.csense = sch->config.csense; | |
346 | schib->pmcw.mbfc = sch->config.mbfc; | |
347 | if (sch->config.mbfc) | |
348 | schib->mba = sch->config.mba; | |
349 | } | |
350 | ||
351 | static int cio_check_config(struct subchannel *sch, struct schib *schib) | |
352 | { | |
353 | return (schib->pmcw.intparm == sch->config.intparm) && | |
354 | (schib->pmcw.mbi == sch->config.mbi) && | |
355 | (schib->pmcw.isc == sch->config.isc) && | |
356 | (schib->pmcw.ena == sch->config.ena) && | |
357 | (schib->pmcw.mme == sch->config.mme) && | |
358 | (schib->pmcw.mp == sch->config.mp) && | |
359 | (schib->pmcw.csense == sch->config.csense) && | |
360 | (schib->pmcw.mbfc == sch->config.mbfc) && | |
361 | (!sch->config.mbfc || (schib->mba == sch->config.mba)); | |
362 | } | |
363 | ||
1da177e4 | 364 | /* |
13952ec1 | 365 | * cio_commit_config - apply configuration to the subchannel |
1da177e4 | 366 | */ |
13952ec1 | 367 | int cio_commit_config(struct subchannel *sch) |
1da177e4 | 368 | { |
13952ec1 SO |
369 | struct schib schib; |
370 | int ccode, retry, ret = 0; | |
371 | ||
372 | if (stsch(sch->schid, &schib) || !css_sch_is_valid(&schib)) | |
373 | return -ENODEV; | |
1da177e4 | 374 | |
1da177e4 | 375 | for (retry = 0; retry < 5; retry++) { |
13952ec1 SO |
376 | /* copy desired changes to local schib */ |
377 | cio_apply_config(sch, &schib); | |
378 | ccode = msch_err(sch->schid, &schib); | |
379 | if (ccode < 0) /* -EIO if msch gets a program check. */ | |
1da177e4 LT |
380 | return ccode; |
381 | switch (ccode) { | |
382 | case 0: /* successfull */ | |
13952ec1 SO |
383 | if (stsch(sch->schid, &schib) || |
384 | !css_sch_is_valid(&schib)) | |
385 | return -ENODEV; | |
386 | if (cio_check_config(sch, &schib)) { | |
387 | /* commit changes from local schib */ | |
388 | memcpy(&sch->schib, &schib, sizeof(schib)); | |
389 | return 0; | |
390 | } | |
391 | ret = -EAGAIN; | |
392 | break; | |
393 | case 1: /* status pending */ | |
1da177e4 | 394 | return -EBUSY; |
13952ec1 SO |
395 | case 2: /* busy */ |
396 | udelay(100); /* allow for recovery */ | |
1da177e4 LT |
397 | ret = -EBUSY; |
398 | break; | |
13952ec1 | 399 | case 3: /* not operational */ |
1da177e4 LT |
400 | return -ENODEV; |
401 | } | |
402 | } | |
403 | return ret; | |
404 | } | |
405 | ||
cdb912a4 SO |
406 | /** |
407 | * cio_update_schib - Perform stsch and update schib if subchannel is valid. | |
408 | * @sch: subchannel on which to perform stsch | |
409 | * Return zero on success, -ENODEV otherwise. | |
410 | */ | |
411 | int cio_update_schib(struct subchannel *sch) | |
412 | { | |
413 | struct schib schib; | |
414 | ||
415 | if (stsch(sch->schid, &schib) || !css_sch_is_valid(&schib)) | |
416 | return -ENODEV; | |
417 | ||
418 | memcpy(&sch->schib, &schib, sizeof(schib)); | |
419 | return 0; | |
420 | } | |
421 | EXPORT_SYMBOL_GPL(cio_update_schib); | |
422 | ||
44a1c19e CH |
423 | /** |
424 | * cio_enable_subchannel - enable a subchannel. | |
425 | * @sch: subchannel to be enabled | |
426 | * @intparm: interruption parameter to set | |
1da177e4 | 427 | */ |
edf22096 | 428 | int cio_enable_subchannel(struct subchannel *sch, u32 intparm) |
1da177e4 LT |
429 | { |
430 | char dbf_txt[15]; | |
1da177e4 LT |
431 | int retry; |
432 | int ret; | |
433 | ||
434 | CIO_TRACE_EVENT (2, "ensch"); | |
2a0217d5 | 435 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 | 436 | |
d7b5a4c9 CH |
437 | if (sch_is_pseudo_sch(sch)) |
438 | return -EINVAL; | |
cdb912a4 | 439 | if (cio_update_schib(sch)) |
1da177e4 LT |
440 | return -ENODEV; |
441 | ||
13952ec1 SO |
442 | sch->config.ena = 1; |
443 | sch->config.isc = sch->isc; | |
444 | sch->config.intparm = intparm; | |
445 | ||
446 | for (retry = 0; retry < 3; retry++) { | |
447 | ret = cio_commit_config(sch); | |
448 | if (ret == -EIO) { | |
1da177e4 | 449 | /* |
13952ec1 | 450 | * Got a program check in msch. Try without |
1da177e4 LT |
451 | * the concurrent sense bit the next time. |
452 | */ | |
13952ec1 SO |
453 | sch->config.csense = 0; |
454 | } else if (ret == -EBUSY) { | |
1da177e4 | 455 | struct irb irb; |
a8237fc4 | 456 | if (tsch(sch->schid, &irb) != 0) |
1da177e4 | 457 | break; |
13952ec1 SO |
458 | } else |
459 | break; | |
1da177e4 LT |
460 | } |
461 | sprintf (dbf_txt, "ret:%d", ret); | |
462 | CIO_TRACE_EVENT (2, dbf_txt); | |
463 | return ret; | |
464 | } | |
44a1c19e | 465 | EXPORT_SYMBOL_GPL(cio_enable_subchannel); |
1da177e4 | 466 | |
44a1c19e CH |
467 | /** |
468 | * cio_disable_subchannel - disable a subchannel. | |
469 | * @sch: subchannel to disable | |
1da177e4 | 470 | */ |
44a1c19e | 471 | int cio_disable_subchannel(struct subchannel *sch) |
1da177e4 LT |
472 | { |
473 | char dbf_txt[15]; | |
1da177e4 LT |
474 | int ret; |
475 | ||
476 | CIO_TRACE_EVENT (2, "dissch"); | |
2a0217d5 | 477 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 | 478 | |
d7b5a4c9 CH |
479 | if (sch_is_pseudo_sch(sch)) |
480 | return 0; | |
cdb912a4 | 481 | if (cio_update_schib(sch)) |
1da177e4 LT |
482 | return -ENODEV; |
483 | ||
23d805b6 | 484 | if (scsw_actl(&sch->schib.scsw) != 0) |
1da177e4 LT |
485 | /* |
486 | * the disable function must not be called while there are | |
487 | * requests pending for completion ! | |
488 | */ | |
489 | return -EBUSY; | |
490 | ||
13952ec1 SO |
491 | sch->config.ena = 0; |
492 | ret = cio_commit_config(sch); | |
493 | ||
1da177e4 LT |
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 | ||
191fd44c HC |
690 | /* |
691 | * Use tpi to get a pending interrupt, call the interrupt handler and | |
692 | * return a pointer to the subchannel structure. | |
693 | */ | |
694 | static int cio_tpi(void) | |
695 | { | |
696 | struct tpi_info *tpi_info; | |
697 | struct subchannel *sch; | |
698 | struct irb *irb; | |
699 | int irq_context; | |
700 | ||
701 | tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID; | |
702 | if (tpi(NULL) != 1) | |
703 | return 0; | |
704 | irb = (struct irb *) __LC_IRB; | |
705 | /* Store interrupt response block to lowcore. */ | |
706 | if (tsch(tpi_info->schid, irb) != 0) | |
707 | /* Not status pending or not operational. */ | |
708 | return 1; | |
709 | sch = (struct subchannel *)(unsigned long)tpi_info->intparm; | |
710 | if (!sch) | |
711 | return 1; | |
712 | irq_context = in_interrupt(); | |
713 | if (!irq_context) | |
714 | local_bh_disable(); | |
715 | irq_enter(); | |
716 | spin_lock(sch->lock); | |
717 | memcpy(&sch->schib.scsw, &irb->scsw, sizeof(union scsw)); | |
718 | if (sch->driver && sch->driver->irq) | |
719 | sch->driver->irq(sch); | |
720 | spin_unlock(sch->lock); | |
721 | irq_exit(); | |
722 | if (!irq_context) | |
723 | _local_bh_enable(); | |
724 | return 1; | |
725 | } | |
726 | ||
cd6b4f27 CH |
727 | void *cio_get_console_priv(void) |
728 | { | |
729 | return &console_priv; | |
730 | } | |
731 | ||
1da177e4 LT |
732 | /* |
733 | * busy wait for the next interrupt on the console | |
734 | */ | |
a806170e HC |
735 | void wait_cons_dev(void) |
736 | __releases(console_subchannel.lock) | |
737 | __acquires(console_subchannel.lock) | |
1da177e4 LT |
738 | { |
739 | unsigned long cr6 __attribute__ ((aligned (8))); | |
740 | unsigned long save_cr6 __attribute__ ((aligned (8))); | |
741 | ||
742 | /* | |
743 | * before entering the spinlock we may already have | |
744 | * processed the interrupt on a different CPU... | |
745 | */ | |
746 | if (!console_subchannel_in_use) | |
747 | return; | |
748 | ||
3a3fc29a | 749 | /* disable all but the console isc */ |
1da177e4 | 750 | __ctl_store (save_cr6, 6, 6); |
3a3fc29a | 751 | cr6 = 1UL << (31 - CONSOLE_ISC); |
1da177e4 LT |
752 | __ctl_load (cr6, 6, 6); |
753 | ||
754 | do { | |
2ec22984 | 755 | spin_unlock(console_subchannel.lock); |
1da177e4 LT |
756 | if (!cio_tpi()) |
757 | cpu_relax(); | |
2ec22984 | 758 | spin_lock(console_subchannel.lock); |
23d805b6 | 759 | } while (console_subchannel.schib.scsw.cmd.actl != 0); |
1da177e4 LT |
760 | /* |
761 | * restore previous isc value | |
762 | */ | |
763 | __ctl_load (save_cr6, 6, 6); | |
764 | } | |
765 | ||
766 | static int | |
f97a56fb CH |
767 | cio_test_for_console(struct subchannel_id schid, void *data) |
768 | { | |
fb6958a5 | 769 | if (stsch_err(schid, &console_subchannel.schib) != 0) |
f97a56fb | 770 | return -ENXIO; |
b279a4f5 CH |
771 | if ((console_subchannel.schib.pmcw.st == SUBCHANNEL_TYPE_IO) && |
772 | console_subchannel.schib.pmcw.dnv && | |
773 | (console_subchannel.schib.pmcw.dev == console_devno)) { | |
f97a56fb CH |
774 | console_irq = schid.sch_no; |
775 | return 1; /* found */ | |
776 | } | |
777 | return 0; | |
778 | } | |
779 | ||
780 | ||
781 | static int | |
782 | cio_get_console_sch_no(void) | |
1da177e4 | 783 | { |
a8237fc4 | 784 | struct subchannel_id schid; |
1da177e4 | 785 | |
a8237fc4 | 786 | init_subchannel_id(&schid); |
1da177e4 LT |
787 | if (console_irq != -1) { |
788 | /* VM provided us with the irq number of the console. */ | |
a8237fc4 CH |
789 | schid.sch_no = console_irq; |
790 | if (stsch(schid, &console_subchannel.schib) != 0 || | |
b279a4f5 | 791 | (console_subchannel.schib.pmcw.st != SUBCHANNEL_TYPE_IO) || |
1da177e4 LT |
792 | !console_subchannel.schib.pmcw.dnv) |
793 | return -1; | |
794 | console_devno = console_subchannel.schib.pmcw.dev; | |
795 | } else if (console_devno != -1) { | |
796 | /* At least the console device number is known. */ | |
f97a56fb | 797 | for_each_subchannel(cio_test_for_console, NULL); |
1da177e4 LT |
798 | if (console_irq == -1) |
799 | return -1; | |
800 | } else { | |
801 | /* unlike in 2.4, we cannot autoprobe here, since | |
802 | * the channel subsystem is not fully initialized. | |
803 | * With some luck, the HWC console can take over */ | |
1da177e4 LT |
804 | return -1; |
805 | } | |
806 | return console_irq; | |
807 | } | |
808 | ||
809 | struct subchannel * | |
810 | cio_probe_console(void) | |
811 | { | |
f97a56fb | 812 | int sch_no, ret; |
a8237fc4 | 813 | struct subchannel_id schid; |
1da177e4 LT |
814 | |
815 | if (xchg(&console_subchannel_in_use, 1) != 0) | |
816 | return ERR_PTR(-EBUSY); | |
f97a56fb CH |
817 | sch_no = cio_get_console_sch_no(); |
818 | if (sch_no == -1) { | |
1da177e4 | 819 | console_subchannel_in_use = 0; |
e6d5a428 | 820 | pr_warning("No CCW console was found\n"); |
1da177e4 LT |
821 | return ERR_PTR(-ENODEV); |
822 | } | |
823 | memset(&console_subchannel, 0, sizeof(struct subchannel)); | |
a8237fc4 | 824 | init_subchannel_id(&schid); |
f97a56fb | 825 | schid.sch_no = sch_no; |
a8237fc4 | 826 | ret = cio_validate_subchannel(&console_subchannel, schid); |
1da177e4 LT |
827 | if (ret) { |
828 | console_subchannel_in_use = 0; | |
829 | return ERR_PTR(-ENODEV); | |
830 | } | |
831 | ||
832 | /* | |
3a3fc29a | 833 | * enable console I/O-interrupt subclass |
1da177e4 | 834 | */ |
6ef556cc | 835 | isc_register(CONSOLE_ISC); |
13952ec1 SO |
836 | console_subchannel.config.isc = CONSOLE_ISC; |
837 | console_subchannel.config.intparm = (u32)(addr_t)&console_subchannel; | |
838 | ret = cio_commit_config(&console_subchannel); | |
1da177e4 | 839 | if (ret) { |
6ef556cc | 840 | isc_unregister(CONSOLE_ISC); |
1da177e4 LT |
841 | console_subchannel_in_use = 0; |
842 | return ERR_PTR(ret); | |
843 | } | |
844 | return &console_subchannel; | |
845 | } | |
846 | ||
847 | void | |
848 | cio_release_console(void) | |
849 | { | |
13952ec1 SO |
850 | console_subchannel.config.intparm = 0; |
851 | cio_commit_config(&console_subchannel); | |
6ef556cc | 852 | isc_unregister(CONSOLE_ISC); |
1da177e4 LT |
853 | console_subchannel_in_use = 0; |
854 | } | |
855 | ||
856 | /* Bah... hack to catch console special sausages. */ | |
857 | int | |
a8237fc4 | 858 | cio_is_console(struct subchannel_id schid) |
1da177e4 LT |
859 | { |
860 | if (!console_subchannel_in_use) | |
861 | return 0; | |
a8237fc4 | 862 | return schid_equal(&schid, &console_subchannel.schid); |
1da177e4 LT |
863 | } |
864 | ||
865 | struct subchannel * | |
866 | cio_get_console_subchannel(void) | |
867 | { | |
868 | if (!console_subchannel_in_use) | |
d2c993d8 | 869 | return NULL; |
1da177e4 LT |
870 | return &console_subchannel; |
871 | } | |
872 | ||
1f4e7eda CH |
873 | const char *cio_get_console_sch_name(struct subchannel_id schid) |
874 | { | |
875 | snprintf(console_sch_name, 10, "0.%x.%04x", schid.ssid, schid.sch_no); | |
876 | return (const char *)console_sch_name; | |
877 | } | |
878 | ||
1da177e4 | 879 | #endif |
4d284cac | 880 | static int |
a8237fc4 | 881 | __disable_subchannel_easy(struct subchannel_id schid, struct schib *schib) |
1da177e4 LT |
882 | { |
883 | int retry, cc; | |
884 | ||
885 | cc = 0; | |
886 | for (retry=0;retry<3;retry++) { | |
887 | schib->pmcw.ena = 0; | |
888 | cc = msch(schid, schib); | |
889 | if (cc) | |
890 | return (cc==3?-ENODEV:-EBUSY); | |
cdb912a4 SO |
891 | if (stsch(schid, schib) || !css_sch_is_valid(schib)) |
892 | return -ENODEV; | |
1da177e4 LT |
893 | if (!schib->pmcw.ena) |
894 | return 0; | |
895 | } | |
896 | return -EBUSY; /* uhm... */ | |
897 | } | |
898 | ||
4d284cac | 899 | static int |
0ae7a7b2 | 900 | __clear_io_subchannel_easy(struct subchannel_id schid) |
1da177e4 LT |
901 | { |
902 | int retry; | |
903 | ||
904 | if (csch(schid)) | |
905 | return -ENODEV; | |
906 | for (retry=0;retry<20;retry++) { | |
907 | struct tpi_info ti; | |
908 | ||
909 | if (tpi(&ti)) { | |
a8237fc4 CH |
910 | tsch(ti.schid, (struct irb *)__LC_IRB); |
911 | if (schid_equal(&ti.schid, &schid)) | |
4c24da79 | 912 | return 0; |
1da177e4 | 913 | } |
5a0d0e65 | 914 | udelay_simple(100); |
1da177e4 LT |
915 | } |
916 | return -EBUSY; | |
917 | } | |
918 | ||
9d92a7e1 CH |
919 | static void __clear_chsc_subchannel_easy(void) |
920 | { | |
921 | /* It seems we can only wait for a bit here :/ */ | |
5a0d0e65 | 922 | udelay_simple(100); |
9d92a7e1 CH |
923 | } |
924 | ||
a45e1414 MH |
925 | static int pgm_check_occured; |
926 | ||
927 | static void cio_reset_pgm_check_handler(void) | |
928 | { | |
929 | pgm_check_occured = 1; | |
930 | } | |
931 | ||
f9c9fe3e | 932 | static int stsch_reset(struct subchannel_id schid, struct schib *addr) |
a45e1414 MH |
933 | { |
934 | int rc; | |
935 | ||
936 | pgm_check_occured = 0; | |
ab14de6c | 937 | s390_base_pgm_handler_fn = cio_reset_pgm_check_handler; |
6faf4444 | 938 | rc = stsch(schid, addr); |
ab14de6c | 939 | s390_base_pgm_handler_fn = NULL; |
aa77015c | 940 | |
ab14de6c | 941 | /* The program check handler could have changed pgm_check_occured. */ |
6faf4444 | 942 | barrier(); |
aa77015c | 943 | |
a45e1414 MH |
944 | if (pgm_check_occured) |
945 | return -EIO; | |
946 | else | |
947 | return rc; | |
948 | } | |
949 | ||
15e9b586 | 950 | static int __shutdown_subchannel_easy(struct subchannel_id schid, void *data) |
f97a56fb CH |
951 | { |
952 | struct schib schib; | |
953 | ||
a45e1414 | 954 | if (stsch_reset(schid, &schib)) |
f97a56fb CH |
955 | return -ENXIO; |
956 | if (!schib.pmcw.ena) | |
957 | return 0; | |
958 | switch(__disable_subchannel_easy(schid, &schib)) { | |
959 | case 0: | |
960 | case -ENODEV: | |
961 | break; | |
962 | default: /* -EBUSY */ | |
0ae7a7b2 CH |
963 | switch (schib.pmcw.st) { |
964 | case SUBCHANNEL_TYPE_IO: | |
965 | if (__clear_io_subchannel_easy(schid)) | |
966 | goto out; /* give up... */ | |
967 | break; | |
9d92a7e1 CH |
968 | case SUBCHANNEL_TYPE_CHSC: |
969 | __clear_chsc_subchannel_easy(); | |
970 | break; | |
0ae7a7b2 CH |
971 | default: |
972 | /* No default clear strategy */ | |
973 | break; | |
974 | } | |
f97a56fb CH |
975 | stsch(schid, &schib); |
976 | __disable_subchannel_easy(schid, &schib); | |
977 | } | |
0ae7a7b2 | 978 | out: |
f97a56fb CH |
979 | return 0; |
980 | } | |
1da177e4 | 981 | |
15e9b586 HC |
982 | static atomic_t chpid_reset_count; |
983 | ||
984 | static void s390_reset_chpids_mcck_handler(void) | |
985 | { | |
986 | struct crw crw; | |
987 | struct mci *mci; | |
988 | ||
989 | /* Check for pending channel report word. */ | |
990 | mci = (struct mci *)&S390_lowcore.mcck_interruption_code; | |
991 | if (!mci->cp) | |
992 | return; | |
993 | /* Process channel report words. */ | |
994 | while (stcrw(&crw) == 0) { | |
995 | /* Check for responses to RCHP. */ | |
996 | if (crw.slct && crw.rsc == CRW_RSC_CPATH) | |
997 | atomic_dec(&chpid_reset_count); | |
998 | } | |
999 | } | |
1000 | ||
1001 | #define RCHP_TIMEOUT (30 * USEC_PER_SEC) | |
1002 | static void css_reset(void) | |
1003 | { | |
1004 | int i, ret; | |
1005 | unsigned long long timeout; | |
f86635fa | 1006 | struct chp_id chpid; |
15e9b586 HC |
1007 | |
1008 | /* Reset subchannels. */ | |
1009 | for_each_subchannel(__shutdown_subchannel_easy, NULL); | |
1010 | /* Reset channel paths. */ | |
ab14de6c | 1011 | s390_base_mcck_handler_fn = s390_reset_chpids_mcck_handler; |
15e9b586 HC |
1012 | /* Enable channel report machine checks. */ |
1013 | __ctl_set_bit(14, 28); | |
1014 | /* Temporarily reenable machine checks. */ | |
1015 | local_mcck_enable(); | |
f86635fa | 1016 | chp_id_init(&chpid); |
15e9b586 | 1017 | for (i = 0; i <= __MAX_CHPID; i++) { |
f86635fa PO |
1018 | chpid.id = i; |
1019 | ret = rchp(chpid); | |
15e9b586 HC |
1020 | if ((ret == 0) || (ret == 2)) |
1021 | /* | |
1022 | * rchp either succeeded, or another rchp is already | |
1023 | * in progress. In either case, we'll get a crw. | |
1024 | */ | |
1025 | atomic_inc(&chpid_reset_count); | |
1026 | } | |
1027 | /* Wait for machine check for all channel paths. */ | |
1028 | timeout = get_clock() + (RCHP_TIMEOUT << 12); | |
1029 | while (atomic_read(&chpid_reset_count) != 0) { | |
1030 | if (get_clock() > timeout) | |
1031 | break; | |
1032 | cpu_relax(); | |
1033 | } | |
1034 | /* Disable machine checks again. */ | |
1035 | local_mcck_disable(); | |
1036 | /* Disable channel report machine checks. */ | |
1037 | __ctl_clear_bit(14, 28); | |
ab14de6c | 1038 | s390_base_mcck_handler_fn = NULL; |
15e9b586 HC |
1039 | } |
1040 | ||
1041 | static struct reset_call css_reset_call = { | |
1042 | .fn = css_reset, | |
1043 | }; | |
1044 | ||
1045 | static int __init init_css_reset_call(void) | |
1046 | { | |
1047 | atomic_set(&chpid_reset_count, 0); | |
1048 | register_reset_call(&css_reset_call); | |
1049 | return 0; | |
1050 | } | |
1051 | ||
1052 | arch_initcall(init_css_reset_call); | |
1053 | ||
1054 | struct sch_match_id { | |
1055 | struct subchannel_id schid; | |
1056 | struct ccw_dev_id devid; | |
1057 | int rc; | |
1058 | }; | |
1059 | ||
1060 | static int __reipl_subchannel_match(struct subchannel_id schid, void *data) | |
1061 | { | |
1062 | struct schib schib; | |
1063 | struct sch_match_id *match_id = data; | |
1064 | ||
a45e1414 | 1065 | if (stsch_reset(schid, &schib)) |
15e9b586 | 1066 | return -ENXIO; |
b279a4f5 | 1067 | if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv && |
15e9b586 HC |
1068 | (schib.pmcw.dev == match_id->devid.devno) && |
1069 | (schid.ssid == match_id->devid.ssid)) { | |
1070 | match_id->schid = schid; | |
1071 | match_id->rc = 0; | |
1072 | return 1; | |
1073 | } | |
1074 | return 0; | |
1075 | } | |
1076 | ||
1077 | static int reipl_find_schid(struct ccw_dev_id *devid, | |
1078 | struct subchannel_id *schid) | |
1da177e4 | 1079 | { |
ff6b8ea6 MH |
1080 | struct sch_match_id match_id; |
1081 | ||
1082 | match_id.devid = *devid; | |
1083 | match_id.rc = -ENODEV; | |
15e9b586 | 1084 | for_each_subchannel(__reipl_subchannel_match, &match_id); |
ff6b8ea6 MH |
1085 | if (match_id.rc == 0) |
1086 | *schid = match_id.schid; | |
1087 | return match_id.rc; | |
1da177e4 LT |
1088 | } |
1089 | ||
ff6b8ea6 MH |
1090 | extern void do_reipl_asm(__u32 schid); |
1091 | ||
1da177e4 | 1092 | /* Make sure all subchannels are quiet before we re-ipl an lpar. */ |
ff6b8ea6 | 1093 | void reipl_ccw_dev(struct ccw_dev_id *devid) |
1da177e4 | 1094 | { |
ff6b8ea6 MH |
1095 | struct subchannel_id schid; |
1096 | ||
15e9b586 HC |
1097 | s390_reset_system(); |
1098 | if (reipl_find_schid(devid, &schid) != 0) | |
ff6b8ea6 | 1099 | panic("IPL Device not found\n"); |
ff6b8ea6 | 1100 | do_reipl_asm(*((__u32*)&schid)); |
1da177e4 | 1101 | } |
e87bfe51 | 1102 | |
6fc321fd | 1103 | int __init cio_get_iplinfo(struct cio_iplinfo *iplinfo) |
e87bfe51 HC |
1104 | { |
1105 | struct subchannel_id schid; | |
6fc321fd | 1106 | struct schib schib; |
e87bfe51 HC |
1107 | |
1108 | schid = *(struct subchannel_id *)__LC_SUBCHANNEL_ID; | |
1109 | if (!schid.one) | |
6fc321fd HC |
1110 | return -ENODEV; |
1111 | if (stsch(schid, &schib)) | |
1112 | return -ENODEV; | |
b279a4f5 CH |
1113 | if (schib.pmcw.st != SUBCHANNEL_TYPE_IO) |
1114 | return -ENODEV; | |
6fc321fd HC |
1115 | if (!schib.pmcw.dnv) |
1116 | return -ENODEV; | |
1117 | iplinfo->devno = schib.pmcw.dev; | |
1118 | iplinfo->is_qdio = schib.pmcw.qf; | |
1119 | return 0; | |
e87bfe51 | 1120 | } |
83262d63 PO |
1121 | |
1122 | /** | |
1123 | * cio_tm_start_key - perform start function | |
1124 | * @sch: subchannel on which to perform the start function | |
1125 | * @tcw: transport-command word to be started | |
1126 | * @lpm: mask of paths to use | |
1127 | * @key: storage key to use for storage access | |
1128 | * | |
1129 | * Start the tcw on the given subchannel. Return zero on success, non-zero | |
1130 | * otherwise. | |
1131 | */ | |
1132 | int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key) | |
1133 | { | |
1134 | int cc; | |
1135 | union orb *orb = &to_io_private(sch)->orb; | |
1136 | ||
1137 | memset(orb, 0, sizeof(union orb)); | |
1138 | orb->tm.intparm = (u32) (addr_t) sch; | |
1139 | orb->tm.key = key >> 4; | |
1140 | orb->tm.b = 1; | |
1141 | orb->tm.lpm = lpm ? lpm : sch->lpm; | |
1142 | orb->tm.tcw = (u32) (addr_t) tcw; | |
1143 | cc = ssch(sch->schid, orb); | |
1144 | switch (cc) { | |
1145 | case 0: | |
1146 | return 0; | |
1147 | case 1: | |
1148 | case 2: | |
1149 | return -EBUSY; | |
1150 | default: | |
1151 | return cio_start_handle_notoper(sch, lpm); | |
1152 | } | |
1153 | } | |
1154 | ||
1155 | /** | |
1156 | * cio_tm_intrg - perform interrogate function | |
1157 | * @sch - subchannel on which to perform the interrogate function | |
1158 | * | |
1159 | * If the specified subchannel is running in transport-mode, perform the | |
1160 | * interrogate function. Return zero on success, non-zero otherwie. | |
1161 | */ | |
1162 | int cio_tm_intrg(struct subchannel *sch) | |
1163 | { | |
1164 | int cc; | |
1165 | ||
1166 | if (!to_io_private(sch)->orb.tm.b) | |
1167 | return -EINVAL; | |
1168 | cc = xsch(sch->schid); | |
1169 | switch (cc) { | |
1170 | case 0: | |
1171 | case 2: | |
1172 | return 0; | |
1173 | case 1: | |
1174 | return -EBUSY; | |
1175 | default: | |
1176 | return -ENODEV; | |
1177 | } | |
1178 | } |