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> |
f5daba1d HC |
33 | #include <asm/nmi.h> |
34 | #include <asm/crw.h> | |
1da177e4 LT |
35 | #include "cio.h" |
36 | #include "css.h" | |
37 | #include "chsc.h" | |
38 | #include "ioasm.h" | |
cd6b4f27 | 39 | #include "io_sch.h" |
1da177e4 LT |
40 | #include "blacklist.h" |
41 | #include "cio_debug.h" | |
e6b6e10a | 42 | #include "chp.h" |
1da177e4 LT |
43 | |
44 | debug_info_t *cio_debug_msg_id; | |
45 | debug_info_t *cio_debug_trace_id; | |
46 | debug_info_t *cio_debug_crw_id; | |
47 | ||
1da177e4 LT |
48 | /* |
49 | * Function: cio_debug_init | |
bc698bcf CH |
50 | * Initializes three debug logs for common I/O: |
51 | * - cio_msg logs generic cio messages | |
1da177e4 | 52 | * - cio_trace logs the calling of different functions |
bc698bcf | 53 | * - cio_crw logs machine check related cio messages |
1da177e4 | 54 | */ |
bc698bcf | 55 | static int __init cio_debug_init(void) |
1da177e4 | 56 | { |
361f494d | 57 | cio_debug_msg_id = debug_register("cio_msg", 16, 1, 16 * sizeof(long)); |
1da177e4 LT |
58 | if (!cio_debug_msg_id) |
59 | goto out_unregister; | |
bc698bcf CH |
60 | debug_register_view(cio_debug_msg_id, &debug_sprintf_view); |
61 | debug_set_level(cio_debug_msg_id, 2); | |
361f494d | 62 | cio_debug_trace_id = debug_register("cio_trace", 16, 1, 16); |
1da177e4 LT |
63 | if (!cio_debug_trace_id) |
64 | goto out_unregister; | |
bc698bcf CH |
65 | debug_register_view(cio_debug_trace_id, &debug_hex_ascii_view); |
66 | debug_set_level(cio_debug_trace_id, 2); | |
361f494d | 67 | cio_debug_crw_id = debug_register("cio_crw", 16, 1, 16 * sizeof(long)); |
1da177e4 LT |
68 | if (!cio_debug_crw_id) |
69 | goto out_unregister; | |
bc698bcf CH |
70 | debug_register_view(cio_debug_crw_id, &debug_sprintf_view); |
71 | debug_set_level(cio_debug_crw_id, 4); | |
1da177e4 LT |
72 | return 0; |
73 | ||
74 | out_unregister: | |
75 | if (cio_debug_msg_id) | |
bc698bcf | 76 | debug_unregister(cio_debug_msg_id); |
1da177e4 | 77 | if (cio_debug_trace_id) |
bc698bcf | 78 | debug_unregister(cio_debug_trace_id); |
1da177e4 | 79 | if (cio_debug_crw_id) |
bc698bcf | 80 | debug_unregister(cio_debug_crw_id); |
1da177e4 LT |
81 | return -1; |
82 | } | |
83 | ||
84 | arch_initcall (cio_debug_init); | |
85 | ||
86 | int | |
87 | cio_set_options (struct subchannel *sch, int flags) | |
88 | { | |
89 | sch->options.suspend = (flags & DOIO_ALLOW_SUSPEND) != 0; | |
90 | sch->options.prefetch = (flags & DOIO_DENY_PREFETCH) != 0; | |
91 | sch->options.inter = (flags & DOIO_SUPPRESS_INTER) != 0; | |
92 | return 0; | |
93 | } | |
94 | ||
95 | /* FIXME: who wants to use this? */ | |
96 | int | |
97 | cio_get_options (struct subchannel *sch) | |
98 | { | |
99 | int flags; | |
100 | ||
101 | flags = 0; | |
102 | if (sch->options.suspend) | |
103 | flags |= DOIO_ALLOW_SUSPEND; | |
104 | if (sch->options.prefetch) | |
105 | flags |= DOIO_DENY_PREFETCH; | |
106 | if (sch->options.inter) | |
107 | flags |= DOIO_SUPPRESS_INTER; | |
108 | return flags; | |
109 | } | |
110 | ||
4d284cac | 111 | static int |
1da177e4 LT |
112 | cio_start_handle_notoper(struct subchannel *sch, __u8 lpm) |
113 | { | |
114 | char dbf_text[15]; | |
115 | ||
116 | if (lpm != 0) | |
117 | sch->lpm &= ~lpm; | |
118 | else | |
119 | sch->lpm = 0; | |
120 | ||
139b83dd | 121 | CIO_MSG_EVENT(2, "cio_start: 'not oper' status for " |
fb6958a5 CH |
122 | "subchannel 0.%x.%04x!\n", sch->schid.ssid, |
123 | sch->schid.sch_no); | |
cdb912a4 SO |
124 | |
125 | if (cio_update_schib(sch)) | |
126 | return -ENODEV; | |
127 | ||
2a0217d5 | 128 | sprintf(dbf_text, "no%s", dev_name(&sch->dev)); |
1da177e4 LT |
129 | CIO_TRACE_EVENT(0, dbf_text); |
130 | CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib)); | |
131 | ||
132 | return (sch->lpm ? -EACCES : -ENODEV); | |
133 | } | |
134 | ||
135 | int | |
136 | cio_start_key (struct subchannel *sch, /* subchannel structure */ | |
137 | struct ccw1 * cpa, /* logical channel prog addr */ | |
138 | __u8 lpm, /* logical path mask */ | |
139 | __u8 key) /* storage key */ | |
140 | { | |
141 | char dbf_txt[15]; | |
142 | int ccode; | |
83262d63 | 143 | union orb *orb; |
1da177e4 | 144 | |
cd6b4f27 | 145 | CIO_TRACE_EVENT(4, "stIO"); |
2a0217d5 | 146 | CIO_TRACE_EVENT(4, dev_name(&sch->dev)); |
1da177e4 | 147 | |
cd6b4f27 | 148 | orb = &to_io_private(sch)->orb; |
9adb8c1d | 149 | memset(orb, 0, sizeof(union orb)); |
1da177e4 | 150 | /* sch is always under 2G. */ |
83262d63 PO |
151 | orb->cmd.intparm = (u32)(addr_t)sch; |
152 | orb->cmd.fmt = 1; | |
1da177e4 | 153 | |
83262d63 PO |
154 | orb->cmd.pfch = sch->options.prefetch == 0; |
155 | orb->cmd.spnd = sch->options.suspend; | |
156 | orb->cmd.ssic = sch->options.suspend && sch->options.inter; | |
157 | orb->cmd.lpm = (lpm != 0) ? lpm : sch->lpm; | |
347a8dc3 | 158 | #ifdef CONFIG_64BIT |
1da177e4 LT |
159 | /* |
160 | * for 64 bit we always support 64 bit IDAWs with 4k page size only | |
161 | */ | |
83262d63 PO |
162 | orb->cmd.c64 = 1; |
163 | orb->cmd.i2k = 0; | |
1da177e4 | 164 | #endif |
83262d63 | 165 | orb->cmd.key = key >> 4; |
1da177e4 | 166 | /* issue "Start Subchannel" */ |
83262d63 | 167 | orb->cmd.cpa = (__u32) __pa(cpa); |
cd6b4f27 | 168 | ccode = ssch(sch->schid, orb); |
1da177e4 LT |
169 | |
170 | /* process condition code */ | |
cd6b4f27 CH |
171 | sprintf(dbf_txt, "ccode:%d", ccode); |
172 | CIO_TRACE_EVENT(4, dbf_txt); | |
1da177e4 LT |
173 | |
174 | switch (ccode) { | |
175 | case 0: | |
176 | /* | |
177 | * initialize device status information | |
178 | */ | |
23d805b6 | 179 | sch->schib.scsw.cmd.actl |= SCSW_ACTL_START_PEND; |
1da177e4 LT |
180 | return 0; |
181 | case 1: /* status pending */ | |
182 | case 2: /* busy */ | |
183 | return -EBUSY; | |
c91ebe49 | 184 | case 3: /* device/path not operational */ |
1da177e4 | 185 | return cio_start_handle_notoper(sch, lpm); |
c91ebe49 CH |
186 | default: |
187 | return ccode; | |
1da177e4 LT |
188 | } |
189 | } | |
190 | ||
191 | int | |
192 | cio_start (struct subchannel *sch, struct ccw1 *cpa, __u8 lpm) | |
193 | { | |
0b642ede | 194 | return cio_start_key(sch, cpa, lpm, PAGE_DEFAULT_KEY); |
1da177e4 LT |
195 | } |
196 | ||
197 | /* | |
198 | * resume suspended I/O operation | |
199 | */ | |
200 | int | |
201 | cio_resume (struct subchannel *sch) | |
202 | { | |
203 | char dbf_txt[15]; | |
204 | int ccode; | |
205 | ||
206 | CIO_TRACE_EVENT (4, "resIO"); | |
2a0217d5 | 207 | CIO_TRACE_EVENT(4, dev_name(&sch->dev)); |
1da177e4 | 208 | |
a8237fc4 | 209 | ccode = rsch (sch->schid); |
1da177e4 LT |
210 | |
211 | sprintf (dbf_txt, "ccode:%d", ccode); | |
212 | CIO_TRACE_EVENT (4, dbf_txt); | |
213 | ||
214 | switch (ccode) { | |
215 | case 0: | |
23d805b6 | 216 | sch->schib.scsw.cmd.actl |= SCSW_ACTL_RESUME_PEND; |
1da177e4 LT |
217 | return 0; |
218 | case 1: | |
219 | return -EBUSY; | |
220 | case 2: | |
221 | return -EINVAL; | |
222 | default: | |
223 | /* | |
224 | * useless to wait for request completion | |
225 | * as device is no longer operational ! | |
226 | */ | |
227 | return -ENODEV; | |
228 | } | |
229 | } | |
230 | ||
231 | /* | |
232 | * halt I/O operation | |
233 | */ | |
234 | int | |
235 | cio_halt(struct subchannel *sch) | |
236 | { | |
237 | char dbf_txt[15]; | |
238 | int ccode; | |
239 | ||
240 | if (!sch) | |
241 | return -ENODEV; | |
242 | ||
243 | CIO_TRACE_EVENT (2, "haltIO"); | |
2a0217d5 | 244 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 LT |
245 | |
246 | /* | |
247 | * Issue "Halt subchannel" and process condition code | |
248 | */ | |
a8237fc4 | 249 | ccode = hsch (sch->schid); |
1da177e4 LT |
250 | |
251 | sprintf (dbf_txt, "ccode:%d", ccode); | |
252 | CIO_TRACE_EVENT (2, dbf_txt); | |
253 | ||
254 | switch (ccode) { | |
255 | case 0: | |
23d805b6 | 256 | sch->schib.scsw.cmd.actl |= SCSW_ACTL_HALT_PEND; |
1da177e4 LT |
257 | return 0; |
258 | case 1: /* status pending */ | |
259 | case 2: /* busy */ | |
260 | return -EBUSY; | |
261 | default: /* device not operational */ | |
262 | return -ENODEV; | |
263 | } | |
264 | } | |
265 | ||
266 | /* | |
267 | * Clear I/O operation | |
268 | */ | |
269 | int | |
270 | cio_clear(struct subchannel *sch) | |
271 | { | |
272 | char dbf_txt[15]; | |
273 | int ccode; | |
274 | ||
275 | if (!sch) | |
276 | return -ENODEV; | |
277 | ||
278 | CIO_TRACE_EVENT (2, "clearIO"); | |
2a0217d5 | 279 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 LT |
280 | |
281 | /* | |
282 | * Issue "Clear subchannel" and process condition code | |
283 | */ | |
a8237fc4 | 284 | ccode = csch (sch->schid); |
1da177e4 LT |
285 | |
286 | sprintf (dbf_txt, "ccode:%d", ccode); | |
287 | CIO_TRACE_EVENT (2, dbf_txt); | |
288 | ||
289 | switch (ccode) { | |
290 | case 0: | |
23d805b6 | 291 | sch->schib.scsw.cmd.actl |= SCSW_ACTL_CLEAR_PEND; |
1da177e4 LT |
292 | return 0; |
293 | default: /* device not operational */ | |
294 | return -ENODEV; | |
295 | } | |
296 | } | |
297 | ||
298 | /* | |
299 | * Function: cio_cancel | |
300 | * Issues a "Cancel Subchannel" on the specified subchannel | |
301 | * Note: We don't need any fancy intparms and flags here | |
302 | * since xsch is executed synchronously. | |
303 | * Only for common I/O internal use as for now. | |
304 | */ | |
305 | int | |
306 | cio_cancel (struct subchannel *sch) | |
307 | { | |
308 | char dbf_txt[15]; | |
309 | int ccode; | |
310 | ||
311 | if (!sch) | |
312 | return -ENODEV; | |
313 | ||
314 | CIO_TRACE_EVENT (2, "cancelIO"); | |
2a0217d5 | 315 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 | 316 | |
a8237fc4 | 317 | ccode = xsch (sch->schid); |
1da177e4 LT |
318 | |
319 | sprintf (dbf_txt, "ccode:%d", ccode); | |
320 | CIO_TRACE_EVENT (2, dbf_txt); | |
321 | ||
322 | switch (ccode) { | |
323 | case 0: /* success */ | |
324 | /* Update information in scsw. */ | |
cdb912a4 SO |
325 | if (cio_update_schib(sch)) |
326 | return -ENODEV; | |
1da177e4 LT |
327 | return 0; |
328 | case 1: /* status pending */ | |
329 | return -EBUSY; | |
330 | case 2: /* not applicable */ | |
331 | return -EINVAL; | |
332 | default: /* not oper */ | |
333 | return -ENODEV; | |
334 | } | |
335 | } | |
336 | ||
13952ec1 SO |
337 | |
338 | static void cio_apply_config(struct subchannel *sch, struct schib *schib) | |
339 | { | |
340 | schib->pmcw.intparm = sch->config.intparm; | |
341 | schib->pmcw.mbi = sch->config.mbi; | |
342 | schib->pmcw.isc = sch->config.isc; | |
343 | schib->pmcw.ena = sch->config.ena; | |
344 | schib->pmcw.mme = sch->config.mme; | |
345 | schib->pmcw.mp = sch->config.mp; | |
346 | schib->pmcw.csense = sch->config.csense; | |
347 | schib->pmcw.mbfc = sch->config.mbfc; | |
348 | if (sch->config.mbfc) | |
349 | schib->mba = sch->config.mba; | |
350 | } | |
351 | ||
352 | static int cio_check_config(struct subchannel *sch, struct schib *schib) | |
353 | { | |
354 | return (schib->pmcw.intparm == sch->config.intparm) && | |
355 | (schib->pmcw.mbi == sch->config.mbi) && | |
356 | (schib->pmcw.isc == sch->config.isc) && | |
357 | (schib->pmcw.ena == sch->config.ena) && | |
358 | (schib->pmcw.mme == sch->config.mme) && | |
359 | (schib->pmcw.mp == sch->config.mp) && | |
360 | (schib->pmcw.csense == sch->config.csense) && | |
361 | (schib->pmcw.mbfc == sch->config.mbfc) && | |
362 | (!sch->config.mbfc || (schib->mba == sch->config.mba)); | |
363 | } | |
364 | ||
1da177e4 | 365 | /* |
13952ec1 | 366 | * cio_commit_config - apply configuration to the subchannel |
1da177e4 | 367 | */ |
13952ec1 | 368 | int cio_commit_config(struct subchannel *sch) |
1da177e4 | 369 | { |
13952ec1 SO |
370 | struct schib schib; |
371 | int ccode, retry, ret = 0; | |
372 | ||
373 | if (stsch(sch->schid, &schib) || !css_sch_is_valid(&schib)) | |
374 | return -ENODEV; | |
1da177e4 | 375 | |
1da177e4 | 376 | for (retry = 0; retry < 5; retry++) { |
13952ec1 SO |
377 | /* copy desired changes to local schib */ |
378 | cio_apply_config(sch, &schib); | |
379 | ccode = msch_err(sch->schid, &schib); | |
380 | if (ccode < 0) /* -EIO if msch gets a program check. */ | |
1da177e4 LT |
381 | return ccode; |
382 | switch (ccode) { | |
73ac36ea | 383 | case 0: /* successful */ |
13952ec1 SO |
384 | if (stsch(sch->schid, &schib) || |
385 | !css_sch_is_valid(&schib)) | |
386 | return -ENODEV; | |
387 | if (cio_check_config(sch, &schib)) { | |
388 | /* commit changes from local schib */ | |
389 | memcpy(&sch->schib, &schib, sizeof(schib)); | |
390 | return 0; | |
391 | } | |
392 | ret = -EAGAIN; | |
393 | break; | |
394 | case 1: /* status pending */ | |
1da177e4 | 395 | return -EBUSY; |
13952ec1 SO |
396 | case 2: /* busy */ |
397 | udelay(100); /* allow for recovery */ | |
1da177e4 LT |
398 | ret = -EBUSY; |
399 | break; | |
13952ec1 | 400 | case 3: /* not operational */ |
1da177e4 LT |
401 | return -ENODEV; |
402 | } | |
403 | } | |
404 | return ret; | |
405 | } | |
406 | ||
cdb912a4 SO |
407 | /** |
408 | * cio_update_schib - Perform stsch and update schib if subchannel is valid. | |
409 | * @sch: subchannel on which to perform stsch | |
410 | * Return zero on success, -ENODEV otherwise. | |
411 | */ | |
412 | int cio_update_schib(struct subchannel *sch) | |
413 | { | |
414 | struct schib schib; | |
415 | ||
416 | if (stsch(sch->schid, &schib) || !css_sch_is_valid(&schib)) | |
417 | return -ENODEV; | |
418 | ||
419 | memcpy(&sch->schib, &schib, sizeof(schib)); | |
420 | return 0; | |
421 | } | |
422 | EXPORT_SYMBOL_GPL(cio_update_schib); | |
423 | ||
44a1c19e CH |
424 | /** |
425 | * cio_enable_subchannel - enable a subchannel. | |
426 | * @sch: subchannel to be enabled | |
427 | * @intparm: interruption parameter to set | |
1da177e4 | 428 | */ |
edf22096 | 429 | int cio_enable_subchannel(struct subchannel *sch, u32 intparm) |
1da177e4 LT |
430 | { |
431 | char dbf_txt[15]; | |
1da177e4 LT |
432 | int retry; |
433 | int ret; | |
434 | ||
435 | CIO_TRACE_EVENT (2, "ensch"); | |
2a0217d5 | 436 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 | 437 | |
d7b5a4c9 CH |
438 | if (sch_is_pseudo_sch(sch)) |
439 | return -EINVAL; | |
cdb912a4 | 440 | if (cio_update_schib(sch)) |
1da177e4 LT |
441 | return -ENODEV; |
442 | ||
13952ec1 SO |
443 | sch->config.ena = 1; |
444 | sch->config.isc = sch->isc; | |
445 | sch->config.intparm = intparm; | |
446 | ||
447 | for (retry = 0; retry < 3; retry++) { | |
448 | ret = cio_commit_config(sch); | |
449 | if (ret == -EIO) { | |
1da177e4 | 450 | /* |
13952ec1 | 451 | * Got a program check in msch. Try without |
1da177e4 LT |
452 | * the concurrent sense bit the next time. |
453 | */ | |
13952ec1 SO |
454 | sch->config.csense = 0; |
455 | } else if (ret == -EBUSY) { | |
1da177e4 | 456 | struct irb irb; |
a8237fc4 | 457 | if (tsch(sch->schid, &irb) != 0) |
1da177e4 | 458 | break; |
13952ec1 SO |
459 | } else |
460 | break; | |
1da177e4 LT |
461 | } |
462 | sprintf (dbf_txt, "ret:%d", ret); | |
463 | CIO_TRACE_EVENT (2, dbf_txt); | |
464 | return ret; | |
465 | } | |
44a1c19e | 466 | EXPORT_SYMBOL_GPL(cio_enable_subchannel); |
1da177e4 | 467 | |
44a1c19e CH |
468 | /** |
469 | * cio_disable_subchannel - disable a subchannel. | |
470 | * @sch: subchannel to disable | |
1da177e4 | 471 | */ |
44a1c19e | 472 | int cio_disable_subchannel(struct subchannel *sch) |
1da177e4 LT |
473 | { |
474 | char dbf_txt[15]; | |
1da177e4 LT |
475 | int ret; |
476 | ||
477 | CIO_TRACE_EVENT (2, "dissch"); | |
2a0217d5 | 478 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 | 479 | |
d7b5a4c9 CH |
480 | if (sch_is_pseudo_sch(sch)) |
481 | return 0; | |
cdb912a4 | 482 | if (cio_update_schib(sch)) |
1da177e4 LT |
483 | return -ENODEV; |
484 | ||
23d805b6 | 485 | if (scsw_actl(&sch->schib.scsw) != 0) |
1da177e4 LT |
486 | /* |
487 | * the disable function must not be called while there are | |
488 | * requests pending for completion ! | |
489 | */ | |
490 | return -EBUSY; | |
491 | ||
13952ec1 SO |
492 | sch->config.ena = 0; |
493 | ret = cio_commit_config(sch); | |
494 | ||
1da177e4 LT |
495 | sprintf (dbf_txt, "ret:%d", ret); |
496 | CIO_TRACE_EVENT (2, dbf_txt); | |
497 | return ret; | |
498 | } | |
44a1c19e | 499 | EXPORT_SYMBOL_GPL(cio_disable_subchannel); |
1da177e4 | 500 | |
d7b5a4c9 | 501 | int cio_create_sch_lock(struct subchannel *sch) |
2ec22984 CH |
502 | { |
503 | sch->lock = kmalloc(sizeof(spinlock_t), GFP_KERNEL); | |
504 | if (!sch->lock) | |
505 | return -ENOMEM; | |
506 | spin_lock_init(sch->lock); | |
507 | return 0; | |
508 | } | |
509 | ||
b3a686f4 | 510 | static int cio_check_devno_blacklisted(struct subchannel *sch) |
0ae7a7b2 | 511 | { |
0ae7a7b2 CH |
512 | if (is_blacklisted(sch->schid.ssid, sch->schib.pmcw.dev)) { |
513 | /* | |
514 | * This device must not be known to Linux. So we simply | |
515 | * say that there is no device and return ENODEV. | |
516 | */ | |
517 | CIO_MSG_EVENT(6, "Blacklisted device detected " | |
518 | "at devno %04X, subchannel set %x\n", | |
519 | sch->schib.pmcw.dev, sch->schid.ssid); | |
520 | return -ENODEV; | |
521 | } | |
522 | return 0; | |
523 | } | |
524 | ||
b3a686f4 CH |
525 | static int cio_validate_io_subchannel(struct subchannel *sch) |
526 | { | |
527 | /* Initialization for io subchannels. */ | |
528 | if (!css_sch_is_valid(&sch->schib)) | |
529 | return -ENODEV; | |
530 | ||
531 | /* Devno is valid. */ | |
532 | return cio_check_devno_blacklisted(sch); | |
533 | } | |
534 | ||
535 | static int cio_validate_msg_subchannel(struct subchannel *sch) | |
536 | { | |
537 | /* Initialization for message subchannels. */ | |
538 | if (!css_sch_is_valid(&sch->schib)) | |
539 | return -ENODEV; | |
540 | ||
541 | /* Devno is valid. */ | |
542 | return cio_check_devno_blacklisted(sch); | |
543 | } | |
544 | ||
0ae7a7b2 CH |
545 | /** |
546 | * cio_validate_subchannel - basic validation of subchannel | |
547 | * @sch: subchannel structure to be filled out | |
548 | * @schid: subchannel id | |
1da177e4 LT |
549 | * |
550 | * Find out subchannel type and initialize struct subchannel. | |
551 | * Return codes: | |
0ae7a7b2 | 552 | * 0 on success |
1da177e4 | 553 | * -ENXIO for non-defined subchannels |
0ae7a7b2 CH |
554 | * -ENODEV for invalid subchannels or blacklisted devices |
555 | * -EIO for subchannels in an invalid subchannel set | |
1da177e4 | 556 | */ |
0ae7a7b2 | 557 | int cio_validate_subchannel(struct subchannel *sch, struct subchannel_id schid) |
1da177e4 LT |
558 | { |
559 | char dbf_txt[15]; | |
560 | int ccode; | |
2ec22984 | 561 | int err; |
1da177e4 | 562 | |
0ae7a7b2 CH |
563 | sprintf(dbf_txt, "valsch%x", schid.sch_no); |
564 | CIO_TRACE_EVENT(4, dbf_txt); | |
1da177e4 LT |
565 | |
566 | /* Nuke all fields. */ | |
567 | memset(sch, 0, sizeof(struct subchannel)); | |
568 | ||
2ec22984 CH |
569 | sch->schid = schid; |
570 | if (cio_is_console(schid)) { | |
571 | sch->lock = cio_get_console_lock(); | |
572 | } else { | |
573 | err = cio_create_sch_lock(sch); | |
574 | if (err) | |
575 | goto out; | |
576 | } | |
6ab4879a | 577 | mutex_init(&sch->reg_mutex); |
1da177e4 | 578 | /* Set a name for the subchannel */ |
1f4e7eda CH |
579 | if (cio_is_console(schid)) |
580 | sch->dev.init_name = cio_get_console_sch_name(schid); | |
581 | else | |
582 | dev_set_name(&sch->dev, "0.%x.%04x", schid.ssid, schid.sch_no); | |
1da177e4 LT |
583 | |
584 | /* | |
585 | * The first subchannel that is not-operational (ccode==3) | |
586 | * indicates that there aren't any more devices available. | |
fb6958a5 CH |
587 | * If stsch gets an exception, it means the current subchannel set |
588 | * is not valid. | |
1da177e4 | 589 | */ |
fb6958a5 | 590 | ccode = stsch_err (schid, &sch->schib); |
2ec22984 CH |
591 | if (ccode) { |
592 | err = (ccode == 3) ? -ENXIO : ccode; | |
593 | goto out; | |
594 | } | |
1da177e4 LT |
595 | /* Copy subchannel type from path management control word. */ |
596 | sch->st = sch->schib.pmcw.st; | |
c820de39 | 597 | |
0ae7a7b2 CH |
598 | switch (sch->st) { |
599 | case SUBCHANNEL_TYPE_IO: | |
600 | err = cio_validate_io_subchannel(sch); | |
601 | break; | |
b3a686f4 CH |
602 | case SUBCHANNEL_TYPE_MSG: |
603 | err = cio_validate_msg_subchannel(sch); | |
604 | break; | |
0ae7a7b2 CH |
605 | default: |
606 | err = 0; | |
1da177e4 | 607 | } |
0ae7a7b2 | 608 | if (err) |
808e4888 | 609 | goto out; |
808e4888 | 610 | |
0ae7a7b2 CH |
611 | CIO_MSG_EVENT(4, "Subchannel 0.%x.%04x reports subchannel type %04X\n", |
612 | sch->schid.ssid, sch->schid.sch_no, sch->st); | |
1da177e4 | 613 | return 0; |
2ec22984 CH |
614 | out: |
615 | if (!cio_is_console(schid)) | |
616 | kfree(sch->lock); | |
617 | sch->lock = NULL; | |
618 | return err; | |
1da177e4 LT |
619 | } |
620 | ||
621 | /* | |
622 | * do_IRQ() handles all normal I/O device IRQ's (the special | |
623 | * SMP cross-CPU interrupts have their own specific | |
624 | * handlers). | |
625 | * | |
626 | */ | |
627 | void | |
628 | do_IRQ (struct pt_regs *regs) | |
629 | { | |
630 | struct tpi_info *tpi_info; | |
631 | struct subchannel *sch; | |
632 | struct irb *irb; | |
5a489b98 | 633 | struct pt_regs *old_regs; |
1da177e4 | 634 | |
5a489b98 | 635 | old_regs = set_irq_regs(regs); |
43ca5c3a | 636 | s390_idle_check(); |
9cfb9b3c | 637 | irq_enter(); |
5a62b192 HC |
638 | if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator) |
639 | /* Serve timer interrupts first. */ | |
640 | clock_comparator_work(); | |
1da177e4 LT |
641 | /* |
642 | * Get interrupt information from lowcore | |
643 | */ | |
644 | tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID; | |
645 | irb = (struct irb *) __LC_IRB; | |
646 | do { | |
647 | kstat_cpu(smp_processor_id()).irqs[IO_INTERRUPT]++; | |
648 | /* | |
649 | * Non I/O-subchannel thin interrupts are processed differently | |
650 | */ | |
651 | if (tpi_info->adapter_IO == 1 && | |
652 | tpi_info->int_type == IO_INTERRUPT_TYPE) { | |
da7c5af8 | 653 | do_adapter_IO(tpi_info->isc); |
1da177e4 LT |
654 | continue; |
655 | } | |
656 | sch = (struct subchannel *)(unsigned long)tpi_info->intparm; | |
a806170e HC |
657 | if (!sch) { |
658 | /* Clear pending interrupt condition. */ | |
659 | tsch(tpi_info->schid, irb); | |
660 | continue; | |
661 | } | |
662 | spin_lock(sch->lock); | |
1da177e4 | 663 | /* Store interrupt response block to lowcore. */ |
a806170e | 664 | if (tsch(tpi_info->schid, irb) == 0) { |
1da177e4 LT |
665 | /* Keep subchannel information word up to date. */ |
666 | memcpy (&sch->schib.scsw, &irb->scsw, | |
667 | sizeof (irb->scsw)); | |
668 | /* Call interrupt handler if there is one. */ | |
669 | if (sch->driver && sch->driver->irq) | |
602b20f2 | 670 | sch->driver->irq(sch); |
1da177e4 | 671 | } |
a806170e | 672 | spin_unlock(sch->lock); |
1da177e4 LT |
673 | /* |
674 | * Are more interrupts pending? | |
675 | * If so, the tpi instruction will update the lowcore | |
676 | * to hold the info for the next interrupt. | |
677 | * We don't do this for VM because a tpi drops the cpu | |
678 | * out of the sie which costs more cycles than it saves. | |
679 | */ | |
680 | } while (!MACHINE_IS_VM && tpi (NULL) != 0); | |
9d0a57cb | 681 | irq_exit(); |
5a489b98 | 682 | set_irq_regs(old_regs); |
1da177e4 LT |
683 | } |
684 | ||
685 | #ifdef CONFIG_CCW_CONSOLE | |
686 | static struct subchannel console_subchannel; | |
1f4e7eda | 687 | static char console_sch_name[10] = "0.x.xxxx"; |
cd6b4f27 | 688 | static struct io_subchannel_private console_priv; |
1da177e4 LT |
689 | static int console_subchannel_in_use; |
690 | ||
191fd44c HC |
691 | /* |
692 | * Use tpi to get a pending interrupt, call the interrupt handler and | |
693 | * return a pointer to the subchannel structure. | |
694 | */ | |
695 | static int cio_tpi(void) | |
696 | { | |
697 | struct tpi_info *tpi_info; | |
698 | struct subchannel *sch; | |
699 | struct irb *irb; | |
700 | int irq_context; | |
701 | ||
702 | tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID; | |
703 | if (tpi(NULL) != 1) | |
704 | return 0; | |
705 | irb = (struct irb *) __LC_IRB; | |
706 | /* Store interrupt response block to lowcore. */ | |
707 | if (tsch(tpi_info->schid, irb) != 0) | |
708 | /* Not status pending or not operational. */ | |
709 | return 1; | |
710 | sch = (struct subchannel *)(unsigned long)tpi_info->intparm; | |
711 | if (!sch) | |
712 | return 1; | |
713 | irq_context = in_interrupt(); | |
714 | if (!irq_context) | |
715 | local_bh_disable(); | |
716 | irq_enter(); | |
717 | spin_lock(sch->lock); | |
718 | memcpy(&sch->schib.scsw, &irb->scsw, sizeof(union scsw)); | |
719 | if (sch->driver && sch->driver->irq) | |
720 | sch->driver->irq(sch); | |
721 | spin_unlock(sch->lock); | |
722 | irq_exit(); | |
723 | if (!irq_context) | |
724 | _local_bh_enable(); | |
725 | return 1; | |
726 | } | |
727 | ||
cd6b4f27 CH |
728 | void *cio_get_console_priv(void) |
729 | { | |
730 | return &console_priv; | |
731 | } | |
732 | ||
1da177e4 LT |
733 | /* |
734 | * busy wait for the next interrupt on the console | |
735 | */ | |
a806170e HC |
736 | void wait_cons_dev(void) |
737 | __releases(console_subchannel.lock) | |
738 | __acquires(console_subchannel.lock) | |
1da177e4 LT |
739 | { |
740 | unsigned long cr6 __attribute__ ((aligned (8))); | |
741 | unsigned long save_cr6 __attribute__ ((aligned (8))); | |
742 | ||
743 | /* | |
744 | * before entering the spinlock we may already have | |
745 | * processed the interrupt on a different CPU... | |
746 | */ | |
747 | if (!console_subchannel_in_use) | |
748 | return; | |
749 | ||
3a3fc29a | 750 | /* disable all but the console isc */ |
1da177e4 | 751 | __ctl_store (save_cr6, 6, 6); |
3a3fc29a | 752 | cr6 = 1UL << (31 - CONSOLE_ISC); |
1da177e4 LT |
753 | __ctl_load (cr6, 6, 6); |
754 | ||
755 | do { | |
2ec22984 | 756 | spin_unlock(console_subchannel.lock); |
1da177e4 LT |
757 | if (!cio_tpi()) |
758 | cpu_relax(); | |
2ec22984 | 759 | spin_lock(console_subchannel.lock); |
23d805b6 | 760 | } while (console_subchannel.schib.scsw.cmd.actl != 0); |
1da177e4 LT |
761 | /* |
762 | * restore previous isc value | |
763 | */ | |
764 | __ctl_load (save_cr6, 6, 6); | |
765 | } | |
766 | ||
767 | static int | |
f97a56fb CH |
768 | cio_test_for_console(struct subchannel_id schid, void *data) |
769 | { | |
fb6958a5 | 770 | if (stsch_err(schid, &console_subchannel.schib) != 0) |
f97a56fb | 771 | return -ENXIO; |
b279a4f5 CH |
772 | if ((console_subchannel.schib.pmcw.st == SUBCHANNEL_TYPE_IO) && |
773 | console_subchannel.schib.pmcw.dnv && | |
774 | (console_subchannel.schib.pmcw.dev == console_devno)) { | |
f97a56fb CH |
775 | console_irq = schid.sch_no; |
776 | return 1; /* found */ | |
777 | } | |
778 | return 0; | |
779 | } | |
780 | ||
781 | ||
782 | static int | |
783 | cio_get_console_sch_no(void) | |
1da177e4 | 784 | { |
a8237fc4 | 785 | struct subchannel_id schid; |
1da177e4 | 786 | |
a8237fc4 | 787 | init_subchannel_id(&schid); |
1da177e4 LT |
788 | if (console_irq != -1) { |
789 | /* VM provided us with the irq number of the console. */ | |
a8237fc4 CH |
790 | schid.sch_no = console_irq; |
791 | if (stsch(schid, &console_subchannel.schib) != 0 || | |
b279a4f5 | 792 | (console_subchannel.schib.pmcw.st != SUBCHANNEL_TYPE_IO) || |
1da177e4 LT |
793 | !console_subchannel.schib.pmcw.dnv) |
794 | return -1; | |
795 | console_devno = console_subchannel.schib.pmcw.dev; | |
796 | } else if (console_devno != -1) { | |
797 | /* At least the console device number is known. */ | |
f97a56fb | 798 | for_each_subchannel(cio_test_for_console, NULL); |
1da177e4 LT |
799 | if (console_irq == -1) |
800 | return -1; | |
801 | } else { | |
802 | /* unlike in 2.4, we cannot autoprobe here, since | |
803 | * the channel subsystem is not fully initialized. | |
804 | * With some luck, the HWC console can take over */ | |
1da177e4 LT |
805 | return -1; |
806 | } | |
807 | return console_irq; | |
808 | } | |
809 | ||
810 | struct subchannel * | |
811 | cio_probe_console(void) | |
812 | { | |
f97a56fb | 813 | int sch_no, ret; |
a8237fc4 | 814 | struct subchannel_id schid; |
1da177e4 LT |
815 | |
816 | if (xchg(&console_subchannel_in_use, 1) != 0) | |
817 | return ERR_PTR(-EBUSY); | |
f97a56fb CH |
818 | sch_no = cio_get_console_sch_no(); |
819 | if (sch_no == -1) { | |
1da177e4 | 820 | console_subchannel_in_use = 0; |
e6d5a428 | 821 | pr_warning("No CCW console was found\n"); |
1da177e4 LT |
822 | return ERR_PTR(-ENODEV); |
823 | } | |
824 | memset(&console_subchannel, 0, sizeof(struct subchannel)); | |
a8237fc4 | 825 | init_subchannel_id(&schid); |
f97a56fb | 826 | schid.sch_no = sch_no; |
a8237fc4 | 827 | ret = cio_validate_subchannel(&console_subchannel, schid); |
1da177e4 LT |
828 | if (ret) { |
829 | console_subchannel_in_use = 0; | |
830 | return ERR_PTR(-ENODEV); | |
831 | } | |
832 | ||
833 | /* | |
3a3fc29a | 834 | * enable console I/O-interrupt subclass |
1da177e4 | 835 | */ |
6ef556cc | 836 | isc_register(CONSOLE_ISC); |
13952ec1 SO |
837 | console_subchannel.config.isc = CONSOLE_ISC; |
838 | console_subchannel.config.intparm = (u32)(addr_t)&console_subchannel; | |
839 | ret = cio_commit_config(&console_subchannel); | |
1da177e4 | 840 | if (ret) { |
6ef556cc | 841 | isc_unregister(CONSOLE_ISC); |
1da177e4 LT |
842 | console_subchannel_in_use = 0; |
843 | return ERR_PTR(ret); | |
844 | } | |
845 | return &console_subchannel; | |
846 | } | |
847 | ||
848 | void | |
849 | cio_release_console(void) | |
850 | { | |
13952ec1 SO |
851 | console_subchannel.config.intparm = 0; |
852 | cio_commit_config(&console_subchannel); | |
6ef556cc | 853 | isc_unregister(CONSOLE_ISC); |
1da177e4 LT |
854 | console_subchannel_in_use = 0; |
855 | } | |
856 | ||
857 | /* Bah... hack to catch console special sausages. */ | |
858 | int | |
a8237fc4 | 859 | cio_is_console(struct subchannel_id schid) |
1da177e4 LT |
860 | { |
861 | if (!console_subchannel_in_use) | |
862 | return 0; | |
a8237fc4 | 863 | return schid_equal(&schid, &console_subchannel.schid); |
1da177e4 LT |
864 | } |
865 | ||
866 | struct subchannel * | |
867 | cio_get_console_subchannel(void) | |
868 | { | |
869 | if (!console_subchannel_in_use) | |
d2c993d8 | 870 | return NULL; |
1da177e4 LT |
871 | return &console_subchannel; |
872 | } | |
873 | ||
1f4e7eda CH |
874 | const char *cio_get_console_sch_name(struct subchannel_id schid) |
875 | { | |
876 | snprintf(console_sch_name, 10, "0.%x.%04x", schid.ssid, schid.sch_no); | |
877 | return (const char *)console_sch_name; | |
878 | } | |
879 | ||
1da177e4 | 880 | #endif |
4d284cac | 881 | static int |
a8237fc4 | 882 | __disable_subchannel_easy(struct subchannel_id schid, struct schib *schib) |
1da177e4 LT |
883 | { |
884 | int retry, cc; | |
885 | ||
886 | cc = 0; | |
887 | for (retry=0;retry<3;retry++) { | |
888 | schib->pmcw.ena = 0; | |
889 | cc = msch(schid, schib); | |
890 | if (cc) | |
891 | return (cc==3?-ENODEV:-EBUSY); | |
cdb912a4 SO |
892 | if (stsch(schid, schib) || !css_sch_is_valid(schib)) |
893 | return -ENODEV; | |
1da177e4 LT |
894 | if (!schib->pmcw.ena) |
895 | return 0; | |
896 | } | |
897 | return -EBUSY; /* uhm... */ | |
898 | } | |
899 | ||
4d284cac | 900 | static int |
0ae7a7b2 | 901 | __clear_io_subchannel_easy(struct subchannel_id schid) |
1da177e4 LT |
902 | { |
903 | int retry; | |
904 | ||
905 | if (csch(schid)) | |
906 | return -ENODEV; | |
907 | for (retry=0;retry<20;retry++) { | |
908 | struct tpi_info ti; | |
909 | ||
910 | if (tpi(&ti)) { | |
a8237fc4 CH |
911 | tsch(ti.schid, (struct irb *)__LC_IRB); |
912 | if (schid_equal(&ti.schid, &schid)) | |
4c24da79 | 913 | return 0; |
1da177e4 | 914 | } |
5a0d0e65 | 915 | udelay_simple(100); |
1da177e4 LT |
916 | } |
917 | return -EBUSY; | |
918 | } | |
919 | ||
9d92a7e1 CH |
920 | static void __clear_chsc_subchannel_easy(void) |
921 | { | |
922 | /* It seems we can only wait for a bit here :/ */ | |
5a0d0e65 | 923 | udelay_simple(100); |
9d92a7e1 CH |
924 | } |
925 | ||
a45e1414 MH |
926 | static int pgm_check_occured; |
927 | ||
928 | static void cio_reset_pgm_check_handler(void) | |
929 | { | |
930 | pgm_check_occured = 1; | |
931 | } | |
932 | ||
f9c9fe3e | 933 | static int stsch_reset(struct subchannel_id schid, struct schib *addr) |
a45e1414 MH |
934 | { |
935 | int rc; | |
936 | ||
937 | pgm_check_occured = 0; | |
ab14de6c | 938 | s390_base_pgm_handler_fn = cio_reset_pgm_check_handler; |
6faf4444 | 939 | rc = stsch(schid, addr); |
ab14de6c | 940 | s390_base_pgm_handler_fn = NULL; |
aa77015c | 941 | |
ab14de6c | 942 | /* The program check handler could have changed pgm_check_occured. */ |
6faf4444 | 943 | barrier(); |
aa77015c | 944 | |
a45e1414 MH |
945 | if (pgm_check_occured) |
946 | return -EIO; | |
947 | else | |
948 | return rc; | |
949 | } | |
950 | ||
15e9b586 | 951 | static int __shutdown_subchannel_easy(struct subchannel_id schid, void *data) |
f97a56fb CH |
952 | { |
953 | struct schib schib; | |
954 | ||
a45e1414 | 955 | if (stsch_reset(schid, &schib)) |
f97a56fb CH |
956 | return -ENXIO; |
957 | if (!schib.pmcw.ena) | |
958 | return 0; | |
959 | switch(__disable_subchannel_easy(schid, &schib)) { | |
960 | case 0: | |
961 | case -ENODEV: | |
962 | break; | |
963 | default: /* -EBUSY */ | |
0ae7a7b2 CH |
964 | switch (schib.pmcw.st) { |
965 | case SUBCHANNEL_TYPE_IO: | |
966 | if (__clear_io_subchannel_easy(schid)) | |
967 | goto out; /* give up... */ | |
968 | break; | |
9d92a7e1 CH |
969 | case SUBCHANNEL_TYPE_CHSC: |
970 | __clear_chsc_subchannel_easy(); | |
971 | break; | |
0ae7a7b2 CH |
972 | default: |
973 | /* No default clear strategy */ | |
974 | break; | |
975 | } | |
f97a56fb CH |
976 | stsch(schid, &schib); |
977 | __disable_subchannel_easy(schid, &schib); | |
978 | } | |
0ae7a7b2 | 979 | out: |
f97a56fb CH |
980 | return 0; |
981 | } | |
1da177e4 | 982 | |
15e9b586 HC |
983 | static atomic_t chpid_reset_count; |
984 | ||
985 | static void s390_reset_chpids_mcck_handler(void) | |
986 | { | |
987 | struct crw crw; | |
988 | struct mci *mci; | |
989 | ||
990 | /* Check for pending channel report word. */ | |
991 | mci = (struct mci *)&S390_lowcore.mcck_interruption_code; | |
992 | if (!mci->cp) | |
993 | return; | |
994 | /* Process channel report words. */ | |
995 | while (stcrw(&crw) == 0) { | |
996 | /* Check for responses to RCHP. */ | |
997 | if (crw.slct && crw.rsc == CRW_RSC_CPATH) | |
998 | atomic_dec(&chpid_reset_count); | |
999 | } | |
1000 | } | |
1001 | ||
1002 | #define RCHP_TIMEOUT (30 * USEC_PER_SEC) | |
1003 | static void css_reset(void) | |
1004 | { | |
1005 | int i, ret; | |
1006 | unsigned long long timeout; | |
f86635fa | 1007 | struct chp_id chpid; |
15e9b586 HC |
1008 | |
1009 | /* Reset subchannels. */ | |
1010 | for_each_subchannel(__shutdown_subchannel_easy, NULL); | |
1011 | /* Reset channel paths. */ | |
ab14de6c | 1012 | s390_base_mcck_handler_fn = s390_reset_chpids_mcck_handler; |
15e9b586 HC |
1013 | /* Enable channel report machine checks. */ |
1014 | __ctl_set_bit(14, 28); | |
1015 | /* Temporarily reenable machine checks. */ | |
1016 | local_mcck_enable(); | |
f86635fa | 1017 | chp_id_init(&chpid); |
15e9b586 | 1018 | for (i = 0; i <= __MAX_CHPID; i++) { |
f86635fa PO |
1019 | chpid.id = i; |
1020 | ret = rchp(chpid); | |
15e9b586 HC |
1021 | if ((ret == 0) || (ret == 2)) |
1022 | /* | |
1023 | * rchp either succeeded, or another rchp is already | |
1024 | * in progress. In either case, we'll get a crw. | |
1025 | */ | |
1026 | atomic_inc(&chpid_reset_count); | |
1027 | } | |
1028 | /* Wait for machine check for all channel paths. */ | |
1029 | timeout = get_clock() + (RCHP_TIMEOUT << 12); | |
1030 | while (atomic_read(&chpid_reset_count) != 0) { | |
1031 | if (get_clock() > timeout) | |
1032 | break; | |
1033 | cpu_relax(); | |
1034 | } | |
1035 | /* Disable machine checks again. */ | |
1036 | local_mcck_disable(); | |
1037 | /* Disable channel report machine checks. */ | |
1038 | __ctl_clear_bit(14, 28); | |
ab14de6c | 1039 | s390_base_mcck_handler_fn = NULL; |
15e9b586 HC |
1040 | } |
1041 | ||
1042 | static struct reset_call css_reset_call = { | |
1043 | .fn = css_reset, | |
1044 | }; | |
1045 | ||
1046 | static int __init init_css_reset_call(void) | |
1047 | { | |
1048 | atomic_set(&chpid_reset_count, 0); | |
1049 | register_reset_call(&css_reset_call); | |
1050 | return 0; | |
1051 | } | |
1052 | ||
1053 | arch_initcall(init_css_reset_call); | |
1054 | ||
1055 | struct sch_match_id { | |
1056 | struct subchannel_id schid; | |
1057 | struct ccw_dev_id devid; | |
1058 | int rc; | |
1059 | }; | |
1060 | ||
1061 | static int __reipl_subchannel_match(struct subchannel_id schid, void *data) | |
1062 | { | |
1063 | struct schib schib; | |
1064 | struct sch_match_id *match_id = data; | |
1065 | ||
a45e1414 | 1066 | if (stsch_reset(schid, &schib)) |
15e9b586 | 1067 | return -ENXIO; |
b279a4f5 | 1068 | if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv && |
15e9b586 HC |
1069 | (schib.pmcw.dev == match_id->devid.devno) && |
1070 | (schid.ssid == match_id->devid.ssid)) { | |
1071 | match_id->schid = schid; | |
1072 | match_id->rc = 0; | |
1073 | return 1; | |
1074 | } | |
1075 | return 0; | |
1076 | } | |
1077 | ||
1078 | static int reipl_find_schid(struct ccw_dev_id *devid, | |
1079 | struct subchannel_id *schid) | |
1da177e4 | 1080 | { |
ff6b8ea6 MH |
1081 | struct sch_match_id match_id; |
1082 | ||
1083 | match_id.devid = *devid; | |
1084 | match_id.rc = -ENODEV; | |
15e9b586 | 1085 | for_each_subchannel(__reipl_subchannel_match, &match_id); |
ff6b8ea6 MH |
1086 | if (match_id.rc == 0) |
1087 | *schid = match_id.schid; | |
1088 | return match_id.rc; | |
1da177e4 LT |
1089 | } |
1090 | ||
ff6b8ea6 MH |
1091 | extern void do_reipl_asm(__u32 schid); |
1092 | ||
1da177e4 | 1093 | /* Make sure all subchannels are quiet before we re-ipl an lpar. */ |
ff6b8ea6 | 1094 | void reipl_ccw_dev(struct ccw_dev_id *devid) |
1da177e4 | 1095 | { |
ff6b8ea6 MH |
1096 | struct subchannel_id schid; |
1097 | ||
15e9b586 HC |
1098 | s390_reset_system(); |
1099 | if (reipl_find_schid(devid, &schid) != 0) | |
ff6b8ea6 | 1100 | panic("IPL Device not found\n"); |
ff6b8ea6 | 1101 | do_reipl_asm(*((__u32*)&schid)); |
1da177e4 | 1102 | } |
e87bfe51 | 1103 | |
6fc321fd | 1104 | int __init cio_get_iplinfo(struct cio_iplinfo *iplinfo) |
e87bfe51 HC |
1105 | { |
1106 | struct subchannel_id schid; | |
6fc321fd | 1107 | struct schib schib; |
e87bfe51 HC |
1108 | |
1109 | schid = *(struct subchannel_id *)__LC_SUBCHANNEL_ID; | |
1110 | if (!schid.one) | |
6fc321fd HC |
1111 | return -ENODEV; |
1112 | if (stsch(schid, &schib)) | |
1113 | return -ENODEV; | |
b279a4f5 CH |
1114 | if (schib.pmcw.st != SUBCHANNEL_TYPE_IO) |
1115 | return -ENODEV; | |
6fc321fd HC |
1116 | if (!schib.pmcw.dnv) |
1117 | return -ENODEV; | |
1118 | iplinfo->devno = schib.pmcw.dev; | |
1119 | iplinfo->is_qdio = schib.pmcw.qf; | |
1120 | return 0; | |
e87bfe51 | 1121 | } |
83262d63 PO |
1122 | |
1123 | /** | |
1124 | * cio_tm_start_key - perform start function | |
1125 | * @sch: subchannel on which to perform the start function | |
1126 | * @tcw: transport-command word to be started | |
1127 | * @lpm: mask of paths to use | |
1128 | * @key: storage key to use for storage access | |
1129 | * | |
1130 | * Start the tcw on the given subchannel. Return zero on success, non-zero | |
1131 | * otherwise. | |
1132 | */ | |
1133 | int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key) | |
1134 | { | |
1135 | int cc; | |
1136 | union orb *orb = &to_io_private(sch)->orb; | |
1137 | ||
1138 | memset(orb, 0, sizeof(union orb)); | |
1139 | orb->tm.intparm = (u32) (addr_t) sch; | |
1140 | orb->tm.key = key >> 4; | |
1141 | orb->tm.b = 1; | |
1142 | orb->tm.lpm = lpm ? lpm : sch->lpm; | |
1143 | orb->tm.tcw = (u32) (addr_t) tcw; | |
1144 | cc = ssch(sch->schid, orb); | |
1145 | switch (cc) { | |
1146 | case 0: | |
1147 | return 0; | |
1148 | case 1: | |
1149 | case 2: | |
1150 | return -EBUSY; | |
1151 | default: | |
1152 | return cio_start_handle_notoper(sch, lpm); | |
1153 | } | |
1154 | } | |
1155 | ||
1156 | /** | |
1157 | * cio_tm_intrg - perform interrogate function | |
1158 | * @sch - subchannel on which to perform the interrogate function | |
1159 | * | |
1160 | * If the specified subchannel is running in transport-mode, perform the | |
1161 | * interrogate function. Return zero on success, non-zero otherwie. | |
1162 | */ | |
1163 | int cio_tm_intrg(struct subchannel *sch) | |
1164 | { | |
1165 | int cc; | |
1166 | ||
1167 | if (!to_io_private(sch)->orb.tm.b) | |
1168 | return -EINVAL; | |
1169 | cc = xsch(sch->schid); | |
1170 | switch (cc) { | |
1171 | case 0: | |
1172 | case 2: | |
1173 | return 0; | |
1174 | case 1: | |
1175 | return -EBUSY; | |
1176 | default: | |
1177 | return -ENODEV; | |
1178 | } | |
1179 | } |