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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 | ||
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> |
76d4e00a | 31 | #include <asm/cputime.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]; | |
ed04b892 | 475 | int retry; |
1da177e4 LT |
476 | int ret; |
477 | ||
478 | CIO_TRACE_EVENT (2, "dissch"); | |
2a0217d5 | 479 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 | 480 | |
d7b5a4c9 CH |
481 | if (sch_is_pseudo_sch(sch)) |
482 | return 0; | |
cdb912a4 | 483 | if (cio_update_schib(sch)) |
1da177e4 LT |
484 | return -ENODEV; |
485 | ||
13952ec1 | 486 | sch->config.ena = 0; |
13952ec1 | 487 | |
ed04b892 CH |
488 | for (retry = 0; retry < 3; retry++) { |
489 | ret = cio_commit_config(sch); | |
490 | if (ret == -EBUSY) { | |
491 | struct irb irb; | |
492 | if (tsch(sch->schid, &irb) != 0) | |
493 | break; | |
494 | } else | |
495 | break; | |
496 | } | |
1da177e4 LT |
497 | sprintf (dbf_txt, "ret:%d", ret); |
498 | CIO_TRACE_EVENT (2, dbf_txt); | |
499 | return ret; | |
500 | } | |
44a1c19e | 501 | EXPORT_SYMBOL_GPL(cio_disable_subchannel); |
1da177e4 | 502 | |
d7b5a4c9 | 503 | int cio_create_sch_lock(struct subchannel *sch) |
2ec22984 CH |
504 | { |
505 | sch->lock = kmalloc(sizeof(spinlock_t), GFP_KERNEL); | |
506 | if (!sch->lock) | |
507 | return -ENOMEM; | |
508 | spin_lock_init(sch->lock); | |
509 | return 0; | |
510 | } | |
511 | ||
b3a686f4 | 512 | static int cio_check_devno_blacklisted(struct subchannel *sch) |
0ae7a7b2 | 513 | { |
0ae7a7b2 CH |
514 | if (is_blacklisted(sch->schid.ssid, sch->schib.pmcw.dev)) { |
515 | /* | |
516 | * This device must not be known to Linux. So we simply | |
517 | * say that there is no device and return ENODEV. | |
518 | */ | |
519 | CIO_MSG_EVENT(6, "Blacklisted device detected " | |
520 | "at devno %04X, subchannel set %x\n", | |
521 | sch->schib.pmcw.dev, sch->schid.ssid); | |
522 | return -ENODEV; | |
523 | } | |
524 | return 0; | |
525 | } | |
526 | ||
b3a686f4 CH |
527 | static int cio_validate_io_subchannel(struct subchannel *sch) |
528 | { | |
529 | /* Initialization for io 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 | ||
537 | static int cio_validate_msg_subchannel(struct subchannel *sch) | |
538 | { | |
539 | /* Initialization for message subchannels. */ | |
540 | if (!css_sch_is_valid(&sch->schib)) | |
541 | return -ENODEV; | |
542 | ||
543 | /* Devno is valid. */ | |
544 | return cio_check_devno_blacklisted(sch); | |
545 | } | |
546 | ||
0ae7a7b2 CH |
547 | /** |
548 | * cio_validate_subchannel - basic validation of subchannel | |
549 | * @sch: subchannel structure to be filled out | |
550 | * @schid: subchannel id | |
1da177e4 LT |
551 | * |
552 | * Find out subchannel type and initialize struct subchannel. | |
553 | * Return codes: | |
0ae7a7b2 | 554 | * 0 on success |
1da177e4 | 555 | * -ENXIO for non-defined subchannels |
0ae7a7b2 CH |
556 | * -ENODEV for invalid subchannels or blacklisted devices |
557 | * -EIO for subchannels in an invalid subchannel set | |
1da177e4 | 558 | */ |
0ae7a7b2 | 559 | int cio_validate_subchannel(struct subchannel *sch, struct subchannel_id schid) |
1da177e4 LT |
560 | { |
561 | char dbf_txt[15]; | |
562 | int ccode; | |
2ec22984 | 563 | int err; |
1da177e4 | 564 | |
0ae7a7b2 CH |
565 | sprintf(dbf_txt, "valsch%x", schid.sch_no); |
566 | CIO_TRACE_EVENT(4, dbf_txt); | |
1da177e4 LT |
567 | |
568 | /* Nuke all fields. */ | |
569 | memset(sch, 0, sizeof(struct subchannel)); | |
570 | ||
2ec22984 CH |
571 | sch->schid = schid; |
572 | if (cio_is_console(schid)) { | |
573 | sch->lock = cio_get_console_lock(); | |
574 | } else { | |
575 | err = cio_create_sch_lock(sch); | |
576 | if (err) | |
577 | goto out; | |
578 | } | |
6ab4879a | 579 | mutex_init(&sch->reg_mutex); |
1da177e4 | 580 | /* Set a name for the subchannel */ |
1f4e7eda CH |
581 | if (cio_is_console(schid)) |
582 | sch->dev.init_name = cio_get_console_sch_name(schid); | |
583 | else | |
584 | dev_set_name(&sch->dev, "0.%x.%04x", schid.ssid, schid.sch_no); | |
1da177e4 LT |
585 | |
586 | /* | |
587 | * The first subchannel that is not-operational (ccode==3) | |
588 | * indicates that there aren't any more devices available. | |
fb6958a5 CH |
589 | * If stsch gets an exception, it means the current subchannel set |
590 | * is not valid. | |
1da177e4 | 591 | */ |
fb6958a5 | 592 | ccode = stsch_err (schid, &sch->schib); |
2ec22984 CH |
593 | if (ccode) { |
594 | err = (ccode == 3) ? -ENXIO : ccode; | |
595 | goto out; | |
596 | } | |
1da177e4 LT |
597 | /* Copy subchannel type from path management control word. */ |
598 | sch->st = sch->schib.pmcw.st; | |
c820de39 | 599 | |
0ae7a7b2 CH |
600 | switch (sch->st) { |
601 | case SUBCHANNEL_TYPE_IO: | |
602 | err = cio_validate_io_subchannel(sch); | |
603 | break; | |
b3a686f4 CH |
604 | case SUBCHANNEL_TYPE_MSG: |
605 | err = cio_validate_msg_subchannel(sch); | |
606 | break; | |
0ae7a7b2 CH |
607 | default: |
608 | err = 0; | |
1da177e4 | 609 | } |
0ae7a7b2 | 610 | if (err) |
808e4888 | 611 | goto out; |
808e4888 | 612 | |
0ae7a7b2 CH |
613 | CIO_MSG_EVENT(4, "Subchannel 0.%x.%04x reports subchannel type %04X\n", |
614 | sch->schid.ssid, sch->schid.sch_no, sch->st); | |
1da177e4 | 615 | return 0; |
2ec22984 CH |
616 | out: |
617 | if (!cio_is_console(schid)) | |
618 | kfree(sch->lock); | |
619 | sch->lock = NULL; | |
620 | return err; | |
1da177e4 LT |
621 | } |
622 | ||
623 | /* | |
624 | * do_IRQ() handles all normal I/O device IRQ's (the special | |
625 | * SMP cross-CPU interrupts have their own specific | |
626 | * handlers). | |
627 | * | |
628 | */ | |
629 | void | |
630 | do_IRQ (struct pt_regs *regs) | |
631 | { | |
632 | struct tpi_info *tpi_info; | |
633 | struct subchannel *sch; | |
634 | struct irb *irb; | |
5a489b98 | 635 | struct pt_regs *old_regs; |
1da177e4 | 636 | |
5a489b98 | 637 | old_regs = set_irq_regs(regs); |
43ca5c3a | 638 | s390_idle_check(); |
9cfb9b3c | 639 | irq_enter(); |
5a62b192 HC |
640 | if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator) |
641 | /* Serve timer interrupts first. */ | |
642 | clock_comparator_work(); | |
1da177e4 LT |
643 | /* |
644 | * Get interrupt information from lowcore | |
645 | */ | |
646 | tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID; | |
647 | irb = (struct irb *) __LC_IRB; | |
648 | do { | |
649 | kstat_cpu(smp_processor_id()).irqs[IO_INTERRUPT]++; | |
650 | /* | |
651 | * Non I/O-subchannel thin interrupts are processed differently | |
652 | */ | |
653 | if (tpi_info->adapter_IO == 1 && | |
654 | tpi_info->int_type == IO_INTERRUPT_TYPE) { | |
da7c5af8 | 655 | do_adapter_IO(tpi_info->isc); |
1da177e4 LT |
656 | continue; |
657 | } | |
658 | sch = (struct subchannel *)(unsigned long)tpi_info->intparm; | |
a806170e HC |
659 | if (!sch) { |
660 | /* Clear pending interrupt condition. */ | |
661 | tsch(tpi_info->schid, irb); | |
662 | continue; | |
663 | } | |
664 | spin_lock(sch->lock); | |
1da177e4 | 665 | /* Store interrupt response block to lowcore. */ |
a806170e | 666 | if (tsch(tpi_info->schid, irb) == 0) { |
1da177e4 LT |
667 | /* Keep subchannel information word up to date. */ |
668 | memcpy (&sch->schib.scsw, &irb->scsw, | |
669 | sizeof (irb->scsw)); | |
670 | /* Call interrupt handler if there is one. */ | |
671 | if (sch->driver && sch->driver->irq) | |
602b20f2 | 672 | sch->driver->irq(sch); |
1da177e4 | 673 | } |
a806170e | 674 | spin_unlock(sch->lock); |
1da177e4 LT |
675 | /* |
676 | * Are more interrupts pending? | |
677 | * If so, the tpi instruction will update the lowcore | |
678 | * to hold the info for the next interrupt. | |
679 | * We don't do this for VM because a tpi drops the cpu | |
680 | * out of the sie which costs more cycles than it saves. | |
681 | */ | |
682 | } while (!MACHINE_IS_VM && tpi (NULL) != 0); | |
9d0a57cb | 683 | irq_exit(); |
5a489b98 | 684 | set_irq_regs(old_regs); |
1da177e4 LT |
685 | } |
686 | ||
687 | #ifdef CONFIG_CCW_CONSOLE | |
688 | static struct subchannel console_subchannel; | |
1f4e7eda | 689 | static char console_sch_name[10] = "0.x.xxxx"; |
cd6b4f27 | 690 | static struct io_subchannel_private console_priv; |
1da177e4 LT |
691 | static int console_subchannel_in_use; |
692 | ||
191fd44c HC |
693 | /* |
694 | * Use tpi to get a pending interrupt, call the interrupt handler and | |
695 | * return a pointer to the subchannel structure. | |
696 | */ | |
697 | static int cio_tpi(void) | |
698 | { | |
699 | struct tpi_info *tpi_info; | |
700 | struct subchannel *sch; | |
701 | struct irb *irb; | |
702 | int irq_context; | |
703 | ||
704 | tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID; | |
705 | if (tpi(NULL) != 1) | |
706 | return 0; | |
707 | irb = (struct irb *) __LC_IRB; | |
708 | /* Store interrupt response block to lowcore. */ | |
709 | if (tsch(tpi_info->schid, irb) != 0) | |
710 | /* Not status pending or not operational. */ | |
711 | return 1; | |
712 | sch = (struct subchannel *)(unsigned long)tpi_info->intparm; | |
713 | if (!sch) | |
714 | return 1; | |
715 | irq_context = in_interrupt(); | |
716 | if (!irq_context) | |
717 | local_bh_disable(); | |
718 | irq_enter(); | |
719 | spin_lock(sch->lock); | |
720 | memcpy(&sch->schib.scsw, &irb->scsw, sizeof(union scsw)); | |
721 | if (sch->driver && sch->driver->irq) | |
722 | sch->driver->irq(sch); | |
723 | spin_unlock(sch->lock); | |
724 | irq_exit(); | |
725 | if (!irq_context) | |
726 | _local_bh_enable(); | |
727 | return 1; | |
728 | } | |
729 | ||
cd6b4f27 CH |
730 | void *cio_get_console_priv(void) |
731 | { | |
732 | return &console_priv; | |
733 | } | |
734 | ||
1da177e4 LT |
735 | /* |
736 | * busy wait for the next interrupt on the console | |
737 | */ | |
a806170e HC |
738 | void wait_cons_dev(void) |
739 | __releases(console_subchannel.lock) | |
740 | __acquires(console_subchannel.lock) | |
1da177e4 LT |
741 | { |
742 | unsigned long cr6 __attribute__ ((aligned (8))); | |
743 | unsigned long save_cr6 __attribute__ ((aligned (8))); | |
744 | ||
745 | /* | |
746 | * before entering the spinlock we may already have | |
747 | * processed the interrupt on a different CPU... | |
748 | */ | |
749 | if (!console_subchannel_in_use) | |
750 | return; | |
751 | ||
3a3fc29a | 752 | /* disable all but the console isc */ |
1da177e4 | 753 | __ctl_store (save_cr6, 6, 6); |
3a3fc29a | 754 | cr6 = 1UL << (31 - CONSOLE_ISC); |
1da177e4 LT |
755 | __ctl_load (cr6, 6, 6); |
756 | ||
757 | do { | |
2ec22984 | 758 | spin_unlock(console_subchannel.lock); |
1da177e4 LT |
759 | if (!cio_tpi()) |
760 | cpu_relax(); | |
2ec22984 | 761 | spin_lock(console_subchannel.lock); |
23d805b6 | 762 | } while (console_subchannel.schib.scsw.cmd.actl != 0); |
1da177e4 LT |
763 | /* |
764 | * restore previous isc value | |
765 | */ | |
766 | __ctl_load (save_cr6, 6, 6); | |
767 | } | |
768 | ||
769 | static int | |
f97a56fb CH |
770 | cio_test_for_console(struct subchannel_id schid, void *data) |
771 | { | |
fb6958a5 | 772 | if (stsch_err(schid, &console_subchannel.schib) != 0) |
f97a56fb | 773 | return -ENXIO; |
b279a4f5 CH |
774 | if ((console_subchannel.schib.pmcw.st == SUBCHANNEL_TYPE_IO) && |
775 | console_subchannel.schib.pmcw.dnv && | |
776 | (console_subchannel.schib.pmcw.dev == console_devno)) { | |
f97a56fb CH |
777 | console_irq = schid.sch_no; |
778 | return 1; /* found */ | |
779 | } | |
780 | return 0; | |
781 | } | |
782 | ||
783 | ||
784 | static int | |
785 | cio_get_console_sch_no(void) | |
1da177e4 | 786 | { |
a8237fc4 | 787 | struct subchannel_id schid; |
1da177e4 | 788 | |
a8237fc4 | 789 | init_subchannel_id(&schid); |
1da177e4 LT |
790 | if (console_irq != -1) { |
791 | /* VM provided us with the irq number of the console. */ | |
a8237fc4 CH |
792 | schid.sch_no = console_irq; |
793 | if (stsch(schid, &console_subchannel.schib) != 0 || | |
b279a4f5 | 794 | (console_subchannel.schib.pmcw.st != SUBCHANNEL_TYPE_IO) || |
1da177e4 LT |
795 | !console_subchannel.schib.pmcw.dnv) |
796 | return -1; | |
797 | console_devno = console_subchannel.schib.pmcw.dev; | |
798 | } else if (console_devno != -1) { | |
799 | /* At least the console device number is known. */ | |
f97a56fb | 800 | for_each_subchannel(cio_test_for_console, NULL); |
1da177e4 LT |
801 | if (console_irq == -1) |
802 | return -1; | |
803 | } else { | |
804 | /* unlike in 2.4, we cannot autoprobe here, since | |
805 | * the channel subsystem is not fully initialized. | |
806 | * With some luck, the HWC console can take over */ | |
1da177e4 LT |
807 | return -1; |
808 | } | |
809 | return console_irq; | |
810 | } | |
811 | ||
812 | struct subchannel * | |
813 | cio_probe_console(void) | |
814 | { | |
f97a56fb | 815 | int sch_no, ret; |
a8237fc4 | 816 | struct subchannel_id schid; |
1da177e4 LT |
817 | |
818 | if (xchg(&console_subchannel_in_use, 1) != 0) | |
819 | return ERR_PTR(-EBUSY); | |
f97a56fb CH |
820 | sch_no = cio_get_console_sch_no(); |
821 | if (sch_no == -1) { | |
1da177e4 | 822 | console_subchannel_in_use = 0; |
e6d5a428 | 823 | pr_warning("No CCW console was found\n"); |
1da177e4 LT |
824 | return ERR_PTR(-ENODEV); |
825 | } | |
826 | memset(&console_subchannel, 0, sizeof(struct subchannel)); | |
a8237fc4 | 827 | init_subchannel_id(&schid); |
f97a56fb | 828 | schid.sch_no = sch_no; |
a8237fc4 | 829 | ret = cio_validate_subchannel(&console_subchannel, schid); |
1da177e4 LT |
830 | if (ret) { |
831 | console_subchannel_in_use = 0; | |
832 | return ERR_PTR(-ENODEV); | |
833 | } | |
834 | ||
835 | /* | |
3a3fc29a | 836 | * enable console I/O-interrupt subclass |
1da177e4 | 837 | */ |
6ef556cc | 838 | isc_register(CONSOLE_ISC); |
13952ec1 SO |
839 | console_subchannel.config.isc = CONSOLE_ISC; |
840 | console_subchannel.config.intparm = (u32)(addr_t)&console_subchannel; | |
841 | ret = cio_commit_config(&console_subchannel); | |
1da177e4 | 842 | if (ret) { |
6ef556cc | 843 | isc_unregister(CONSOLE_ISC); |
1da177e4 LT |
844 | console_subchannel_in_use = 0; |
845 | return ERR_PTR(ret); | |
846 | } | |
847 | return &console_subchannel; | |
848 | } | |
849 | ||
850 | void | |
851 | cio_release_console(void) | |
852 | { | |
13952ec1 SO |
853 | console_subchannel.config.intparm = 0; |
854 | cio_commit_config(&console_subchannel); | |
6ef556cc | 855 | isc_unregister(CONSOLE_ISC); |
1da177e4 LT |
856 | console_subchannel_in_use = 0; |
857 | } | |
858 | ||
859 | /* Bah... hack to catch console special sausages. */ | |
860 | int | |
a8237fc4 | 861 | cio_is_console(struct subchannel_id schid) |
1da177e4 LT |
862 | { |
863 | if (!console_subchannel_in_use) | |
864 | return 0; | |
a8237fc4 | 865 | return schid_equal(&schid, &console_subchannel.schid); |
1da177e4 LT |
866 | } |
867 | ||
868 | struct subchannel * | |
869 | cio_get_console_subchannel(void) | |
870 | { | |
871 | if (!console_subchannel_in_use) | |
d2c993d8 | 872 | return NULL; |
1da177e4 LT |
873 | return &console_subchannel; |
874 | } | |
875 | ||
1f4e7eda CH |
876 | const char *cio_get_console_sch_name(struct subchannel_id schid) |
877 | { | |
878 | snprintf(console_sch_name, 10, "0.%x.%04x", schid.ssid, schid.sch_no); | |
879 | return (const char *)console_sch_name; | |
880 | } | |
881 | ||
1da177e4 | 882 | #endif |
4d284cac | 883 | static int |
a8237fc4 | 884 | __disable_subchannel_easy(struct subchannel_id schid, struct schib *schib) |
1da177e4 LT |
885 | { |
886 | int retry, cc; | |
887 | ||
888 | cc = 0; | |
889 | for (retry=0;retry<3;retry++) { | |
890 | schib->pmcw.ena = 0; | |
891 | cc = msch(schid, schib); | |
892 | if (cc) | |
893 | return (cc==3?-ENODEV:-EBUSY); | |
cdb912a4 SO |
894 | if (stsch(schid, schib) || !css_sch_is_valid(schib)) |
895 | return -ENODEV; | |
1da177e4 LT |
896 | if (!schib->pmcw.ena) |
897 | return 0; | |
898 | } | |
899 | return -EBUSY; /* uhm... */ | |
900 | } | |
901 | ||
4d284cac | 902 | static int |
0ae7a7b2 | 903 | __clear_io_subchannel_easy(struct subchannel_id schid) |
1da177e4 LT |
904 | { |
905 | int retry; | |
906 | ||
907 | if (csch(schid)) | |
908 | return -ENODEV; | |
909 | for (retry=0;retry<20;retry++) { | |
910 | struct tpi_info ti; | |
911 | ||
912 | if (tpi(&ti)) { | |
a8237fc4 CH |
913 | tsch(ti.schid, (struct irb *)__LC_IRB); |
914 | if (schid_equal(&ti.schid, &schid)) | |
4c24da79 | 915 | return 0; |
1da177e4 | 916 | } |
5a0d0e65 | 917 | udelay_simple(100); |
1da177e4 LT |
918 | } |
919 | return -EBUSY; | |
920 | } | |
921 | ||
9d92a7e1 CH |
922 | static void __clear_chsc_subchannel_easy(void) |
923 | { | |
924 | /* It seems we can only wait for a bit here :/ */ | |
5a0d0e65 | 925 | udelay_simple(100); |
9d92a7e1 CH |
926 | } |
927 | ||
a45e1414 MH |
928 | static int pgm_check_occured; |
929 | ||
930 | static void cio_reset_pgm_check_handler(void) | |
931 | { | |
932 | pgm_check_occured = 1; | |
933 | } | |
934 | ||
f9c9fe3e | 935 | static int stsch_reset(struct subchannel_id schid, struct schib *addr) |
a45e1414 MH |
936 | { |
937 | int rc; | |
938 | ||
939 | pgm_check_occured = 0; | |
ab14de6c | 940 | s390_base_pgm_handler_fn = cio_reset_pgm_check_handler; |
6faf4444 | 941 | rc = stsch(schid, addr); |
ab14de6c | 942 | s390_base_pgm_handler_fn = NULL; |
aa77015c | 943 | |
ab14de6c | 944 | /* The program check handler could have changed pgm_check_occured. */ |
6faf4444 | 945 | barrier(); |
aa77015c | 946 | |
a45e1414 MH |
947 | if (pgm_check_occured) |
948 | return -EIO; | |
949 | else | |
950 | return rc; | |
951 | } | |
952 | ||
15e9b586 | 953 | static int __shutdown_subchannel_easy(struct subchannel_id schid, void *data) |
f97a56fb CH |
954 | { |
955 | struct schib schib; | |
956 | ||
a45e1414 | 957 | if (stsch_reset(schid, &schib)) |
f97a56fb CH |
958 | return -ENXIO; |
959 | if (!schib.pmcw.ena) | |
960 | return 0; | |
961 | switch(__disable_subchannel_easy(schid, &schib)) { | |
962 | case 0: | |
963 | case -ENODEV: | |
964 | break; | |
965 | default: /* -EBUSY */ | |
0ae7a7b2 CH |
966 | switch (schib.pmcw.st) { |
967 | case SUBCHANNEL_TYPE_IO: | |
968 | if (__clear_io_subchannel_easy(schid)) | |
969 | goto out; /* give up... */ | |
970 | break; | |
9d92a7e1 CH |
971 | case SUBCHANNEL_TYPE_CHSC: |
972 | __clear_chsc_subchannel_easy(); | |
973 | break; | |
0ae7a7b2 CH |
974 | default: |
975 | /* No default clear strategy */ | |
976 | break; | |
977 | } | |
f97a56fb CH |
978 | stsch(schid, &schib); |
979 | __disable_subchannel_easy(schid, &schib); | |
980 | } | |
0ae7a7b2 | 981 | out: |
f97a56fb CH |
982 | return 0; |
983 | } | |
1da177e4 | 984 | |
15e9b586 HC |
985 | static atomic_t chpid_reset_count; |
986 | ||
987 | static void s390_reset_chpids_mcck_handler(void) | |
988 | { | |
989 | struct crw crw; | |
990 | struct mci *mci; | |
991 | ||
992 | /* Check for pending channel report word. */ | |
993 | mci = (struct mci *)&S390_lowcore.mcck_interruption_code; | |
994 | if (!mci->cp) | |
995 | return; | |
996 | /* Process channel report words. */ | |
997 | while (stcrw(&crw) == 0) { | |
998 | /* Check for responses to RCHP. */ | |
999 | if (crw.slct && crw.rsc == CRW_RSC_CPATH) | |
1000 | atomic_dec(&chpid_reset_count); | |
1001 | } | |
1002 | } | |
1003 | ||
1004 | #define RCHP_TIMEOUT (30 * USEC_PER_SEC) | |
1005 | static void css_reset(void) | |
1006 | { | |
1007 | int i, ret; | |
1008 | unsigned long long timeout; | |
f86635fa | 1009 | struct chp_id chpid; |
15e9b586 HC |
1010 | |
1011 | /* Reset subchannels. */ | |
1012 | for_each_subchannel(__shutdown_subchannel_easy, NULL); | |
1013 | /* Reset channel paths. */ | |
ab14de6c | 1014 | s390_base_mcck_handler_fn = s390_reset_chpids_mcck_handler; |
15e9b586 HC |
1015 | /* Enable channel report machine checks. */ |
1016 | __ctl_set_bit(14, 28); | |
1017 | /* Temporarily reenable machine checks. */ | |
1018 | local_mcck_enable(); | |
f86635fa | 1019 | chp_id_init(&chpid); |
15e9b586 | 1020 | for (i = 0; i <= __MAX_CHPID; i++) { |
f86635fa PO |
1021 | chpid.id = i; |
1022 | ret = rchp(chpid); | |
15e9b586 HC |
1023 | if ((ret == 0) || (ret == 2)) |
1024 | /* | |
1025 | * rchp either succeeded, or another rchp is already | |
1026 | * in progress. In either case, we'll get a crw. | |
1027 | */ | |
1028 | atomic_inc(&chpid_reset_count); | |
1029 | } | |
1030 | /* Wait for machine check for all channel paths. */ | |
1031 | timeout = get_clock() + (RCHP_TIMEOUT << 12); | |
1032 | while (atomic_read(&chpid_reset_count) != 0) { | |
1033 | if (get_clock() > timeout) | |
1034 | break; | |
1035 | cpu_relax(); | |
1036 | } | |
1037 | /* Disable machine checks again. */ | |
1038 | local_mcck_disable(); | |
1039 | /* Disable channel report machine checks. */ | |
1040 | __ctl_clear_bit(14, 28); | |
ab14de6c | 1041 | s390_base_mcck_handler_fn = NULL; |
15e9b586 HC |
1042 | } |
1043 | ||
1044 | static struct reset_call css_reset_call = { | |
1045 | .fn = css_reset, | |
1046 | }; | |
1047 | ||
1048 | static int __init init_css_reset_call(void) | |
1049 | { | |
1050 | atomic_set(&chpid_reset_count, 0); | |
1051 | register_reset_call(&css_reset_call); | |
1052 | return 0; | |
1053 | } | |
1054 | ||
1055 | arch_initcall(init_css_reset_call); | |
1056 | ||
1057 | struct sch_match_id { | |
1058 | struct subchannel_id schid; | |
1059 | struct ccw_dev_id devid; | |
1060 | int rc; | |
1061 | }; | |
1062 | ||
1063 | static int __reipl_subchannel_match(struct subchannel_id schid, void *data) | |
1064 | { | |
1065 | struct schib schib; | |
1066 | struct sch_match_id *match_id = data; | |
1067 | ||
a45e1414 | 1068 | if (stsch_reset(schid, &schib)) |
15e9b586 | 1069 | return -ENXIO; |
b279a4f5 | 1070 | if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv && |
15e9b586 HC |
1071 | (schib.pmcw.dev == match_id->devid.devno) && |
1072 | (schid.ssid == match_id->devid.ssid)) { | |
1073 | match_id->schid = schid; | |
1074 | match_id->rc = 0; | |
1075 | return 1; | |
1076 | } | |
1077 | return 0; | |
1078 | } | |
1079 | ||
1080 | static int reipl_find_schid(struct ccw_dev_id *devid, | |
1081 | struct subchannel_id *schid) | |
1da177e4 | 1082 | { |
ff6b8ea6 MH |
1083 | struct sch_match_id match_id; |
1084 | ||
1085 | match_id.devid = *devid; | |
1086 | match_id.rc = -ENODEV; | |
15e9b586 | 1087 | for_each_subchannel(__reipl_subchannel_match, &match_id); |
ff6b8ea6 MH |
1088 | if (match_id.rc == 0) |
1089 | *schid = match_id.schid; | |
1090 | return match_id.rc; | |
1da177e4 LT |
1091 | } |
1092 | ||
ff6b8ea6 MH |
1093 | extern void do_reipl_asm(__u32 schid); |
1094 | ||
1da177e4 | 1095 | /* Make sure all subchannels are quiet before we re-ipl an lpar. */ |
ff6b8ea6 | 1096 | void reipl_ccw_dev(struct ccw_dev_id *devid) |
1da177e4 | 1097 | { |
ff6b8ea6 MH |
1098 | struct subchannel_id schid; |
1099 | ||
15e9b586 HC |
1100 | s390_reset_system(); |
1101 | if (reipl_find_schid(devid, &schid) != 0) | |
ff6b8ea6 | 1102 | panic("IPL Device not found\n"); |
ff6b8ea6 | 1103 | do_reipl_asm(*((__u32*)&schid)); |
1da177e4 | 1104 | } |
e87bfe51 | 1105 | |
6fc321fd | 1106 | int __init cio_get_iplinfo(struct cio_iplinfo *iplinfo) |
e87bfe51 HC |
1107 | { |
1108 | struct subchannel_id schid; | |
6fc321fd | 1109 | struct schib schib; |
e87bfe51 HC |
1110 | |
1111 | schid = *(struct subchannel_id *)__LC_SUBCHANNEL_ID; | |
1112 | if (!schid.one) | |
6fc321fd HC |
1113 | return -ENODEV; |
1114 | if (stsch(schid, &schib)) | |
1115 | return -ENODEV; | |
b279a4f5 CH |
1116 | if (schib.pmcw.st != SUBCHANNEL_TYPE_IO) |
1117 | return -ENODEV; | |
6fc321fd HC |
1118 | if (!schib.pmcw.dnv) |
1119 | return -ENODEV; | |
1120 | iplinfo->devno = schib.pmcw.dev; | |
1121 | iplinfo->is_qdio = schib.pmcw.qf; | |
1122 | return 0; | |
e87bfe51 | 1123 | } |
83262d63 PO |
1124 | |
1125 | /** | |
1126 | * cio_tm_start_key - perform start function | |
1127 | * @sch: subchannel on which to perform the start function | |
1128 | * @tcw: transport-command word to be started | |
1129 | * @lpm: mask of paths to use | |
1130 | * @key: storage key to use for storage access | |
1131 | * | |
1132 | * Start the tcw on the given subchannel. Return zero on success, non-zero | |
1133 | * otherwise. | |
1134 | */ | |
1135 | int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key) | |
1136 | { | |
1137 | int cc; | |
1138 | union orb *orb = &to_io_private(sch)->orb; | |
1139 | ||
1140 | memset(orb, 0, sizeof(union orb)); | |
1141 | orb->tm.intparm = (u32) (addr_t) sch; | |
1142 | orb->tm.key = key >> 4; | |
1143 | orb->tm.b = 1; | |
1144 | orb->tm.lpm = lpm ? lpm : sch->lpm; | |
1145 | orb->tm.tcw = (u32) (addr_t) tcw; | |
1146 | cc = ssch(sch->schid, orb); | |
1147 | switch (cc) { | |
1148 | case 0: | |
1149 | return 0; | |
1150 | case 1: | |
1151 | case 2: | |
1152 | return -EBUSY; | |
1153 | default: | |
1154 | return cio_start_handle_notoper(sch, lpm); | |
1155 | } | |
1156 | } | |
1157 | ||
1158 | /** | |
1159 | * cio_tm_intrg - perform interrogate function | |
1160 | * @sch - subchannel on which to perform the interrogate function | |
1161 | * | |
1162 | * If the specified subchannel is running in transport-mode, perform the | |
1163 | * interrogate function. Return zero on success, non-zero otherwie. | |
1164 | */ | |
1165 | int cio_tm_intrg(struct subchannel *sch) | |
1166 | { | |
1167 | int cc; | |
1168 | ||
1169 | if (!to_io_private(sch)->orb.tm.b) | |
1170 | return -EINVAL; | |
1171 | cc = xsch(sch->schid); | |
1172 | switch (cc) { | |
1173 | case 0: | |
1174 | case 2: | |
1175 | return 0; | |
1176 | case 1: | |
1177 | return -EBUSY; | |
1178 | default: | |
1179 | return -ENODEV; | |
1180 | } | |
1181 | } |