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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 | ||
88dbd203 | 15 | #include <linux/ftrace.h> |
1da177e4 | 16 | #include <linux/module.h> |
1da177e4 LT |
17 | #include <linux/init.h> |
18 | #include <linux/slab.h> | |
19 | #include <linux/device.h> | |
20 | #include <linux/kernel_stat.h> | |
21 | #include <linux/interrupt.h> | |
1da177e4 LT |
22 | #include <asm/cio.h> |
23 | #include <asm/delay.h> | |
24 | #include <asm/irq.h> | |
5a489b98 | 25 | #include <asm/irq_regs.h> |
e87bfe51 | 26 | #include <asm/setup.h> |
15e9b586 | 27 | #include <asm/reset.h> |
46b05d26 | 28 | #include <asm/ipl.h> |
e5854a58 | 29 | #include <asm/chpid.h> |
4e8e56c6 | 30 | #include <asm/airq.h> |
3a3fc29a | 31 | #include <asm/isc.h> |
76d4e00a | 32 | #include <asm/cputime.h> |
83262d63 | 33 | #include <asm/fcx.h> |
f5daba1d HC |
34 | #include <asm/nmi.h> |
35 | #include <asm/crw.h> | |
1da177e4 LT |
36 | #include "cio.h" |
37 | #include "css.h" | |
38 | #include "chsc.h" | |
39 | #include "ioasm.h" | |
cd6b4f27 | 40 | #include "io_sch.h" |
1da177e4 LT |
41 | #include "blacklist.h" |
42 | #include "cio_debug.h" | |
e6b6e10a | 43 | #include "chp.h" |
1da177e4 LT |
44 | |
45 | debug_info_t *cio_debug_msg_id; | |
46 | debug_info_t *cio_debug_trace_id; | |
47 | debug_info_t *cio_debug_crw_id; | |
48 | ||
1da177e4 LT |
49 | /* |
50 | * Function: cio_debug_init | |
bc698bcf CH |
51 | * Initializes three debug logs for common I/O: |
52 | * - cio_msg logs generic cio messages | |
1da177e4 | 53 | * - cio_trace logs the calling of different functions |
bc698bcf | 54 | * - cio_crw logs machine check related cio messages |
1da177e4 | 55 | */ |
bc698bcf | 56 | static int __init cio_debug_init(void) |
1da177e4 | 57 | { |
361f494d | 58 | cio_debug_msg_id = debug_register("cio_msg", 16, 1, 16 * sizeof(long)); |
1da177e4 LT |
59 | if (!cio_debug_msg_id) |
60 | goto out_unregister; | |
bc698bcf CH |
61 | debug_register_view(cio_debug_msg_id, &debug_sprintf_view); |
62 | debug_set_level(cio_debug_msg_id, 2); | |
361f494d | 63 | cio_debug_trace_id = debug_register("cio_trace", 16, 1, 16); |
1da177e4 LT |
64 | if (!cio_debug_trace_id) |
65 | goto out_unregister; | |
bc698bcf CH |
66 | debug_register_view(cio_debug_trace_id, &debug_hex_ascii_view); |
67 | debug_set_level(cio_debug_trace_id, 2); | |
361f494d | 68 | cio_debug_crw_id = debug_register("cio_crw", 16, 1, 16 * sizeof(long)); |
1da177e4 LT |
69 | if (!cio_debug_crw_id) |
70 | goto out_unregister; | |
bc698bcf CH |
71 | debug_register_view(cio_debug_crw_id, &debug_sprintf_view); |
72 | debug_set_level(cio_debug_crw_id, 4); | |
1da177e4 LT |
73 | return 0; |
74 | ||
75 | out_unregister: | |
76 | if (cio_debug_msg_id) | |
bc698bcf | 77 | debug_unregister(cio_debug_msg_id); |
1da177e4 | 78 | if (cio_debug_trace_id) |
bc698bcf | 79 | debug_unregister(cio_debug_trace_id); |
1da177e4 | 80 | if (cio_debug_crw_id) |
bc698bcf | 81 | debug_unregister(cio_debug_crw_id); |
1da177e4 LT |
82 | return -1; |
83 | } | |
84 | ||
85 | arch_initcall (cio_debug_init); | |
86 | ||
87 | int | |
88 | cio_set_options (struct subchannel *sch, int flags) | |
89 | { | |
90 | sch->options.suspend = (flags & DOIO_ALLOW_SUSPEND) != 0; | |
91 | sch->options.prefetch = (flags & DOIO_DENY_PREFETCH) != 0; | |
92 | sch->options.inter = (flags & DOIO_SUPPRESS_INTER) != 0; | |
93 | return 0; | |
94 | } | |
95 | ||
96 | /* FIXME: who wants to use this? */ | |
97 | int | |
98 | cio_get_options (struct subchannel *sch) | |
99 | { | |
100 | int flags; | |
101 | ||
102 | flags = 0; | |
103 | if (sch->options.suspend) | |
104 | flags |= DOIO_ALLOW_SUSPEND; | |
105 | if (sch->options.prefetch) | |
106 | flags |= DOIO_DENY_PREFETCH; | |
107 | if (sch->options.inter) | |
108 | flags |= DOIO_SUPPRESS_INTER; | |
109 | return flags; | |
110 | } | |
111 | ||
4d284cac | 112 | static int |
1da177e4 LT |
113 | cio_start_handle_notoper(struct subchannel *sch, __u8 lpm) |
114 | { | |
115 | char dbf_text[15]; | |
116 | ||
117 | if (lpm != 0) | |
118 | sch->lpm &= ~lpm; | |
119 | else | |
120 | sch->lpm = 0; | |
121 | ||
139b83dd | 122 | CIO_MSG_EVENT(2, "cio_start: 'not oper' status for " |
fb6958a5 CH |
123 | "subchannel 0.%x.%04x!\n", sch->schid.ssid, |
124 | sch->schid.sch_no); | |
cdb912a4 SO |
125 | |
126 | if (cio_update_schib(sch)) | |
127 | return -ENODEV; | |
128 | ||
2a0217d5 | 129 | sprintf(dbf_text, "no%s", dev_name(&sch->dev)); |
1da177e4 LT |
130 | CIO_TRACE_EVENT(0, dbf_text); |
131 | CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib)); | |
132 | ||
133 | return (sch->lpm ? -EACCES : -ENODEV); | |
134 | } | |
135 | ||
136 | int | |
137 | cio_start_key (struct subchannel *sch, /* subchannel structure */ | |
138 | struct ccw1 * cpa, /* logical channel prog addr */ | |
139 | __u8 lpm, /* logical path mask */ | |
140 | __u8 key) /* storage key */ | |
141 | { | |
1da177e4 | 142 | int ccode; |
83262d63 | 143 | union orb *orb; |
1da177e4 | 144 | |
efd986db SO |
145 | CIO_TRACE_EVENT(5, "stIO"); |
146 | CIO_TRACE_EVENT(5, 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 */ | |
efd986db | 171 | CIO_HEX_EVENT(5, &ccode, sizeof(ccode)); |
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 | { | |
1da177e4 LT |
202 | int ccode; |
203 | ||
efd986db | 204 | CIO_TRACE_EVENT(4, "resIO"); |
2a0217d5 | 205 | CIO_TRACE_EVENT(4, dev_name(&sch->dev)); |
1da177e4 | 206 | |
a8237fc4 | 207 | ccode = rsch (sch->schid); |
1da177e4 | 208 | |
efd986db | 209 | CIO_HEX_EVENT(4, &ccode, sizeof(ccode)); |
1da177e4 LT |
210 | |
211 | switch (ccode) { | |
212 | case 0: | |
23d805b6 | 213 | sch->schib.scsw.cmd.actl |= SCSW_ACTL_RESUME_PEND; |
1da177e4 LT |
214 | return 0; |
215 | case 1: | |
216 | return -EBUSY; | |
217 | case 2: | |
218 | return -EINVAL; | |
219 | default: | |
220 | /* | |
221 | * useless to wait for request completion | |
222 | * as device is no longer operational ! | |
223 | */ | |
224 | return -ENODEV; | |
225 | } | |
226 | } | |
227 | ||
228 | /* | |
229 | * halt I/O operation | |
230 | */ | |
231 | int | |
232 | cio_halt(struct subchannel *sch) | |
233 | { | |
1da177e4 LT |
234 | int ccode; |
235 | ||
236 | if (!sch) | |
237 | return -ENODEV; | |
238 | ||
efd986db | 239 | CIO_TRACE_EVENT(2, "haltIO"); |
2a0217d5 | 240 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 LT |
241 | |
242 | /* | |
243 | * Issue "Halt subchannel" and process condition code | |
244 | */ | |
a8237fc4 | 245 | ccode = hsch (sch->schid); |
1da177e4 | 246 | |
efd986db | 247 | CIO_HEX_EVENT(2, &ccode, sizeof(ccode)); |
1da177e4 LT |
248 | |
249 | switch (ccode) { | |
250 | case 0: | |
23d805b6 | 251 | sch->schib.scsw.cmd.actl |= SCSW_ACTL_HALT_PEND; |
1da177e4 LT |
252 | return 0; |
253 | case 1: /* status pending */ | |
254 | case 2: /* busy */ | |
255 | return -EBUSY; | |
256 | default: /* device not operational */ | |
257 | return -ENODEV; | |
258 | } | |
259 | } | |
260 | ||
261 | /* | |
262 | * Clear I/O operation | |
263 | */ | |
264 | int | |
265 | cio_clear(struct subchannel *sch) | |
266 | { | |
1da177e4 LT |
267 | int ccode; |
268 | ||
269 | if (!sch) | |
270 | return -ENODEV; | |
271 | ||
efd986db | 272 | CIO_TRACE_EVENT(2, "clearIO"); |
2a0217d5 | 273 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 LT |
274 | |
275 | /* | |
276 | * Issue "Clear subchannel" and process condition code | |
277 | */ | |
a8237fc4 | 278 | ccode = csch (sch->schid); |
1da177e4 | 279 | |
efd986db | 280 | CIO_HEX_EVENT(2, &ccode, sizeof(ccode)); |
1da177e4 LT |
281 | |
282 | switch (ccode) { | |
283 | case 0: | |
23d805b6 | 284 | sch->schib.scsw.cmd.actl |= SCSW_ACTL_CLEAR_PEND; |
1da177e4 LT |
285 | return 0; |
286 | default: /* device not operational */ | |
287 | return -ENODEV; | |
288 | } | |
289 | } | |
290 | ||
291 | /* | |
292 | * Function: cio_cancel | |
293 | * Issues a "Cancel Subchannel" on the specified subchannel | |
294 | * Note: We don't need any fancy intparms and flags here | |
295 | * since xsch is executed synchronously. | |
296 | * Only for common I/O internal use as for now. | |
297 | */ | |
298 | int | |
299 | cio_cancel (struct subchannel *sch) | |
300 | { | |
1da177e4 LT |
301 | int ccode; |
302 | ||
303 | if (!sch) | |
304 | return -ENODEV; | |
305 | ||
efd986db | 306 | CIO_TRACE_EVENT(2, "cancelIO"); |
2a0217d5 | 307 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 | 308 | |
a8237fc4 | 309 | ccode = xsch (sch->schid); |
1da177e4 | 310 | |
efd986db | 311 | CIO_HEX_EVENT(2, &ccode, sizeof(ccode)); |
1da177e4 LT |
312 | |
313 | switch (ccode) { | |
314 | case 0: /* success */ | |
315 | /* Update information in scsw. */ | |
cdb912a4 SO |
316 | if (cio_update_schib(sch)) |
317 | return -ENODEV; | |
1da177e4 LT |
318 | return 0; |
319 | case 1: /* status pending */ | |
320 | return -EBUSY; | |
321 | case 2: /* not applicable */ | |
322 | return -EINVAL; | |
323 | default: /* not oper */ | |
324 | return -ENODEV; | |
325 | } | |
326 | } | |
327 | ||
13952ec1 SO |
328 | |
329 | static void cio_apply_config(struct subchannel *sch, struct schib *schib) | |
330 | { | |
331 | schib->pmcw.intparm = sch->config.intparm; | |
332 | schib->pmcw.mbi = sch->config.mbi; | |
333 | schib->pmcw.isc = sch->config.isc; | |
334 | schib->pmcw.ena = sch->config.ena; | |
335 | schib->pmcw.mme = sch->config.mme; | |
336 | schib->pmcw.mp = sch->config.mp; | |
337 | schib->pmcw.csense = sch->config.csense; | |
338 | schib->pmcw.mbfc = sch->config.mbfc; | |
339 | if (sch->config.mbfc) | |
340 | schib->mba = sch->config.mba; | |
341 | } | |
342 | ||
343 | static int cio_check_config(struct subchannel *sch, struct schib *schib) | |
344 | { | |
345 | return (schib->pmcw.intparm == sch->config.intparm) && | |
346 | (schib->pmcw.mbi == sch->config.mbi) && | |
347 | (schib->pmcw.isc == sch->config.isc) && | |
348 | (schib->pmcw.ena == sch->config.ena) && | |
349 | (schib->pmcw.mme == sch->config.mme) && | |
350 | (schib->pmcw.mp == sch->config.mp) && | |
351 | (schib->pmcw.csense == sch->config.csense) && | |
352 | (schib->pmcw.mbfc == sch->config.mbfc) && | |
353 | (!sch->config.mbfc || (schib->mba == sch->config.mba)); | |
354 | } | |
355 | ||
1da177e4 | 356 | /* |
13952ec1 | 357 | * cio_commit_config - apply configuration to the subchannel |
1da177e4 | 358 | */ |
13952ec1 | 359 | int cio_commit_config(struct subchannel *sch) |
1da177e4 | 360 | { |
13952ec1 SO |
361 | struct schib schib; |
362 | int ccode, retry, ret = 0; | |
363 | ||
8821d24c | 364 | if (stsch_err(sch->schid, &schib) || !css_sch_is_valid(&schib)) |
13952ec1 | 365 | return -ENODEV; |
1da177e4 | 366 | |
1da177e4 | 367 | for (retry = 0; retry < 5; retry++) { |
13952ec1 SO |
368 | /* copy desired changes to local schib */ |
369 | cio_apply_config(sch, &schib); | |
370 | ccode = msch_err(sch->schid, &schib); | |
371 | if (ccode < 0) /* -EIO if msch gets a program check. */ | |
1da177e4 LT |
372 | return ccode; |
373 | switch (ccode) { | |
73ac36ea | 374 | case 0: /* successful */ |
8821d24c | 375 | if (stsch_err(sch->schid, &schib) || |
13952ec1 SO |
376 | !css_sch_is_valid(&schib)) |
377 | return -ENODEV; | |
378 | if (cio_check_config(sch, &schib)) { | |
379 | /* commit changes from local schib */ | |
380 | memcpy(&sch->schib, &schib, sizeof(schib)); | |
381 | return 0; | |
382 | } | |
383 | ret = -EAGAIN; | |
384 | break; | |
385 | case 1: /* status pending */ | |
1da177e4 | 386 | return -EBUSY; |
13952ec1 SO |
387 | case 2: /* busy */ |
388 | udelay(100); /* allow for recovery */ | |
1da177e4 LT |
389 | ret = -EBUSY; |
390 | break; | |
13952ec1 | 391 | case 3: /* not operational */ |
1da177e4 LT |
392 | return -ENODEV; |
393 | } | |
394 | } | |
395 | return ret; | |
396 | } | |
397 | ||
cdb912a4 SO |
398 | /** |
399 | * cio_update_schib - Perform stsch and update schib if subchannel is valid. | |
400 | * @sch: subchannel on which to perform stsch | |
401 | * Return zero on success, -ENODEV otherwise. | |
402 | */ | |
403 | int cio_update_schib(struct subchannel *sch) | |
404 | { | |
405 | struct schib schib; | |
406 | ||
8821d24c | 407 | if (stsch_err(sch->schid, &schib) || !css_sch_is_valid(&schib)) |
cdb912a4 SO |
408 | return -ENODEV; |
409 | ||
410 | memcpy(&sch->schib, &schib, sizeof(schib)); | |
411 | return 0; | |
412 | } | |
413 | EXPORT_SYMBOL_GPL(cio_update_schib); | |
414 | ||
44a1c19e CH |
415 | /** |
416 | * cio_enable_subchannel - enable a subchannel. | |
417 | * @sch: subchannel to be enabled | |
418 | * @intparm: interruption parameter to set | |
1da177e4 | 419 | */ |
edf22096 | 420 | int cio_enable_subchannel(struct subchannel *sch, u32 intparm) |
1da177e4 | 421 | { |
1da177e4 LT |
422 | int retry; |
423 | int ret; | |
424 | ||
efd986db | 425 | CIO_TRACE_EVENT(2, "ensch"); |
2a0217d5 | 426 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 | 427 | |
d7b5a4c9 CH |
428 | if (sch_is_pseudo_sch(sch)) |
429 | return -EINVAL; | |
cdb912a4 | 430 | if (cio_update_schib(sch)) |
1da177e4 LT |
431 | return -ENODEV; |
432 | ||
13952ec1 SO |
433 | sch->config.ena = 1; |
434 | sch->config.isc = sch->isc; | |
435 | sch->config.intparm = intparm; | |
436 | ||
437 | for (retry = 0; retry < 3; retry++) { | |
438 | ret = cio_commit_config(sch); | |
439 | if (ret == -EIO) { | |
1da177e4 | 440 | /* |
13952ec1 | 441 | * Got a program check in msch. Try without |
1da177e4 LT |
442 | * the concurrent sense bit the next time. |
443 | */ | |
13952ec1 SO |
444 | sch->config.csense = 0; |
445 | } else if (ret == -EBUSY) { | |
1da177e4 | 446 | struct irb irb; |
a8237fc4 | 447 | if (tsch(sch->schid, &irb) != 0) |
1da177e4 | 448 | break; |
13952ec1 SO |
449 | } else |
450 | break; | |
1da177e4 | 451 | } |
efd986db | 452 | CIO_HEX_EVENT(2, &ret, sizeof(ret)); |
1da177e4 LT |
453 | return ret; |
454 | } | |
44a1c19e | 455 | EXPORT_SYMBOL_GPL(cio_enable_subchannel); |
1da177e4 | 456 | |
44a1c19e CH |
457 | /** |
458 | * cio_disable_subchannel - disable a subchannel. | |
459 | * @sch: subchannel to disable | |
1da177e4 | 460 | */ |
44a1c19e | 461 | int cio_disable_subchannel(struct subchannel *sch) |
1da177e4 | 462 | { |
ed04b892 | 463 | int retry; |
1da177e4 LT |
464 | int ret; |
465 | ||
efd986db | 466 | CIO_TRACE_EVENT(2, "dissch"); |
2a0217d5 | 467 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 | 468 | |
d7b5a4c9 CH |
469 | if (sch_is_pseudo_sch(sch)) |
470 | return 0; | |
cdb912a4 | 471 | if (cio_update_schib(sch)) |
1da177e4 LT |
472 | return -ENODEV; |
473 | ||
13952ec1 | 474 | sch->config.ena = 0; |
13952ec1 | 475 | |
ed04b892 CH |
476 | for (retry = 0; retry < 3; retry++) { |
477 | ret = cio_commit_config(sch); | |
478 | if (ret == -EBUSY) { | |
479 | struct irb irb; | |
480 | if (tsch(sch->schid, &irb) != 0) | |
481 | break; | |
482 | } else | |
483 | break; | |
484 | } | |
efd986db | 485 | CIO_HEX_EVENT(2, &ret, sizeof(ret)); |
1da177e4 LT |
486 | return ret; |
487 | } | |
44a1c19e | 488 | EXPORT_SYMBOL_GPL(cio_disable_subchannel); |
1da177e4 | 489 | |
d7b5a4c9 | 490 | int cio_create_sch_lock(struct subchannel *sch) |
2ec22984 CH |
491 | { |
492 | sch->lock = kmalloc(sizeof(spinlock_t), GFP_KERNEL); | |
493 | if (!sch->lock) | |
494 | return -ENOMEM; | |
495 | spin_lock_init(sch->lock); | |
496 | return 0; | |
497 | } | |
498 | ||
b3a686f4 | 499 | static int cio_check_devno_blacklisted(struct subchannel *sch) |
0ae7a7b2 | 500 | { |
0ae7a7b2 CH |
501 | if (is_blacklisted(sch->schid.ssid, sch->schib.pmcw.dev)) { |
502 | /* | |
503 | * This device must not be known to Linux. So we simply | |
504 | * say that there is no device and return ENODEV. | |
505 | */ | |
506 | CIO_MSG_EVENT(6, "Blacklisted device detected " | |
507 | "at devno %04X, subchannel set %x\n", | |
508 | sch->schib.pmcw.dev, sch->schid.ssid); | |
509 | return -ENODEV; | |
510 | } | |
511 | return 0; | |
512 | } | |
513 | ||
b3a686f4 CH |
514 | static int cio_validate_io_subchannel(struct subchannel *sch) |
515 | { | |
516 | /* Initialization for io subchannels. */ | |
517 | if (!css_sch_is_valid(&sch->schib)) | |
518 | return -ENODEV; | |
519 | ||
520 | /* Devno is valid. */ | |
521 | return cio_check_devno_blacklisted(sch); | |
522 | } | |
523 | ||
524 | static int cio_validate_msg_subchannel(struct subchannel *sch) | |
525 | { | |
526 | /* Initialization for message 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 | ||
0ae7a7b2 CH |
534 | /** |
535 | * cio_validate_subchannel - basic validation of subchannel | |
536 | * @sch: subchannel structure to be filled out | |
537 | * @schid: subchannel id | |
1da177e4 LT |
538 | * |
539 | * Find out subchannel type and initialize struct subchannel. | |
540 | * Return codes: | |
0ae7a7b2 | 541 | * 0 on success |
1da177e4 | 542 | * -ENXIO for non-defined subchannels |
0ae7a7b2 CH |
543 | * -ENODEV for invalid subchannels or blacklisted devices |
544 | * -EIO for subchannels in an invalid subchannel set | |
1da177e4 | 545 | */ |
0ae7a7b2 | 546 | int cio_validate_subchannel(struct subchannel *sch, struct subchannel_id schid) |
1da177e4 LT |
547 | { |
548 | char dbf_txt[15]; | |
549 | int ccode; | |
2ec22984 | 550 | int err; |
1da177e4 | 551 | |
0ae7a7b2 CH |
552 | sprintf(dbf_txt, "valsch%x", schid.sch_no); |
553 | CIO_TRACE_EVENT(4, dbf_txt); | |
1da177e4 LT |
554 | |
555 | /* Nuke all fields. */ | |
556 | memset(sch, 0, sizeof(struct subchannel)); | |
557 | ||
2ec22984 CH |
558 | sch->schid = schid; |
559 | if (cio_is_console(schid)) { | |
560 | sch->lock = cio_get_console_lock(); | |
561 | } else { | |
562 | err = cio_create_sch_lock(sch); | |
563 | if (err) | |
564 | goto out; | |
565 | } | |
6ab4879a | 566 | mutex_init(&sch->reg_mutex); |
1da177e4 LT |
567 | |
568 | /* | |
569 | * The first subchannel that is not-operational (ccode==3) | |
570 | * indicates that there aren't any more devices available. | |
fb6958a5 CH |
571 | * If stsch gets an exception, it means the current subchannel set |
572 | * is not valid. | |
1da177e4 | 573 | */ |
fb6958a5 | 574 | ccode = stsch_err (schid, &sch->schib); |
2ec22984 CH |
575 | if (ccode) { |
576 | err = (ccode == 3) ? -ENXIO : ccode; | |
577 | goto out; | |
578 | } | |
1da177e4 LT |
579 | /* Copy subchannel type from path management control word. */ |
580 | sch->st = sch->schib.pmcw.st; | |
c820de39 | 581 | |
0ae7a7b2 CH |
582 | switch (sch->st) { |
583 | case SUBCHANNEL_TYPE_IO: | |
584 | err = cio_validate_io_subchannel(sch); | |
585 | break; | |
b3a686f4 CH |
586 | case SUBCHANNEL_TYPE_MSG: |
587 | err = cio_validate_msg_subchannel(sch); | |
588 | break; | |
0ae7a7b2 CH |
589 | default: |
590 | err = 0; | |
1da177e4 | 591 | } |
0ae7a7b2 | 592 | if (err) |
808e4888 | 593 | goto out; |
808e4888 | 594 | |
0ae7a7b2 CH |
595 | CIO_MSG_EVENT(4, "Subchannel 0.%x.%04x reports subchannel type %04X\n", |
596 | sch->schid.ssid, sch->schid.sch_no, sch->st); | |
1da177e4 | 597 | return 0; |
2ec22984 CH |
598 | out: |
599 | if (!cio_is_console(schid)) | |
600 | kfree(sch->lock); | |
601 | sch->lock = NULL; | |
602 | return err; | |
1da177e4 LT |
603 | } |
604 | ||
605 | /* | |
606 | * do_IRQ() handles all normal I/O device IRQ's (the special | |
607 | * SMP cross-CPU interrupts have their own specific | |
608 | * handlers). | |
609 | * | |
610 | */ | |
88dbd203 | 611 | void __irq_entry do_IRQ(struct pt_regs *regs) |
1da177e4 LT |
612 | { |
613 | struct tpi_info *tpi_info; | |
614 | struct subchannel *sch; | |
615 | struct irb *irb; | |
5a489b98 | 616 | struct pt_regs *old_regs; |
1da177e4 | 617 | |
5a489b98 | 618 | old_regs = set_irq_regs(regs); |
6377981f MS |
619 | s390_idle_check(regs, S390_lowcore.int_clock, |
620 | S390_lowcore.async_enter_timer); | |
9cfb9b3c | 621 | irq_enter(); |
3c5d92a0 | 622 | __get_cpu_var(s390_idle).nohz_delay = 1; |
5a62b192 HC |
623 | if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator) |
624 | /* Serve timer interrupts first. */ | |
625 | clock_comparator_work(); | |
1da177e4 LT |
626 | /* |
627 | * Get interrupt information from lowcore | |
628 | */ | |
cbb870c8 HC |
629 | tpi_info = (struct tpi_info *)&S390_lowcore.subchannel_id; |
630 | irb = (struct irb *)&S390_lowcore.irb; | |
1da177e4 LT |
631 | do { |
632 | kstat_cpu(smp_processor_id()).irqs[IO_INTERRUPT]++; | |
633 | /* | |
634 | * Non I/O-subchannel thin interrupts are processed differently | |
635 | */ | |
636 | if (tpi_info->adapter_IO == 1 && | |
637 | tpi_info->int_type == IO_INTERRUPT_TYPE) { | |
da7c5af8 | 638 | do_adapter_IO(tpi_info->isc); |
1da177e4 LT |
639 | continue; |
640 | } | |
641 | sch = (struct subchannel *)(unsigned long)tpi_info->intparm; | |
a806170e HC |
642 | if (!sch) { |
643 | /* Clear pending interrupt condition. */ | |
644 | tsch(tpi_info->schid, irb); | |
645 | continue; | |
646 | } | |
647 | spin_lock(sch->lock); | |
1da177e4 | 648 | /* Store interrupt response block to lowcore. */ |
a806170e | 649 | if (tsch(tpi_info->schid, irb) == 0) { |
1da177e4 LT |
650 | /* Keep subchannel information word up to date. */ |
651 | memcpy (&sch->schib.scsw, &irb->scsw, | |
652 | sizeof (irb->scsw)); | |
653 | /* Call interrupt handler if there is one. */ | |
654 | if (sch->driver && sch->driver->irq) | |
602b20f2 | 655 | sch->driver->irq(sch); |
1da177e4 | 656 | } |
a806170e | 657 | spin_unlock(sch->lock); |
1da177e4 LT |
658 | /* |
659 | * Are more interrupts pending? | |
660 | * If so, the tpi instruction will update the lowcore | |
661 | * to hold the info for the next interrupt. | |
662 | * We don't do this for VM because a tpi drops the cpu | |
663 | * out of the sie which costs more cycles than it saves. | |
664 | */ | |
27d71602 | 665 | } while (MACHINE_IS_LPAR && tpi(NULL) != 0); |
9d0a57cb | 666 | irq_exit(); |
5a489b98 | 667 | set_irq_regs(old_regs); |
1da177e4 LT |
668 | } |
669 | ||
670 | #ifdef CONFIG_CCW_CONSOLE | |
671 | static struct subchannel console_subchannel; | |
cd6b4f27 | 672 | static struct io_subchannel_private console_priv; |
1da177e4 LT |
673 | static int console_subchannel_in_use; |
674 | ||
191fd44c HC |
675 | /* |
676 | * Use tpi to get a pending interrupt, call the interrupt handler and | |
677 | * return a pointer to the subchannel structure. | |
678 | */ | |
679 | static int cio_tpi(void) | |
680 | { | |
681 | struct tpi_info *tpi_info; | |
682 | struct subchannel *sch; | |
683 | struct irb *irb; | |
684 | int irq_context; | |
685 | ||
cbb870c8 | 686 | tpi_info = (struct tpi_info *)&S390_lowcore.subchannel_id; |
191fd44c HC |
687 | if (tpi(NULL) != 1) |
688 | return 0; | |
cbb870c8 | 689 | irb = (struct irb *)&S390_lowcore.irb; |
191fd44c HC |
690 | /* Store interrupt response block to lowcore. */ |
691 | if (tsch(tpi_info->schid, irb) != 0) | |
692 | /* Not status pending or not operational. */ | |
693 | return 1; | |
694 | sch = (struct subchannel *)(unsigned long)tpi_info->intparm; | |
695 | if (!sch) | |
696 | return 1; | |
697 | irq_context = in_interrupt(); | |
698 | if (!irq_context) | |
699 | local_bh_disable(); | |
700 | irq_enter(); | |
701 | spin_lock(sch->lock); | |
702 | memcpy(&sch->schib.scsw, &irb->scsw, sizeof(union scsw)); | |
703 | if (sch->driver && sch->driver->irq) | |
704 | sch->driver->irq(sch); | |
705 | spin_unlock(sch->lock); | |
706 | irq_exit(); | |
707 | if (!irq_context) | |
708 | _local_bh_enable(); | |
709 | return 1; | |
710 | } | |
711 | ||
cd6b4f27 CH |
712 | void *cio_get_console_priv(void) |
713 | { | |
714 | return &console_priv; | |
715 | } | |
716 | ||
1da177e4 LT |
717 | /* |
718 | * busy wait for the next interrupt on the console | |
719 | */ | |
a806170e HC |
720 | void wait_cons_dev(void) |
721 | __releases(console_subchannel.lock) | |
722 | __acquires(console_subchannel.lock) | |
1da177e4 LT |
723 | { |
724 | unsigned long cr6 __attribute__ ((aligned (8))); | |
725 | unsigned long save_cr6 __attribute__ ((aligned (8))); | |
726 | ||
727 | /* | |
728 | * before entering the spinlock we may already have | |
729 | * processed the interrupt on a different CPU... | |
730 | */ | |
731 | if (!console_subchannel_in_use) | |
732 | return; | |
733 | ||
3a3fc29a | 734 | /* disable all but the console isc */ |
1da177e4 | 735 | __ctl_store (save_cr6, 6, 6); |
3a3fc29a | 736 | cr6 = 1UL << (31 - CONSOLE_ISC); |
1da177e4 LT |
737 | __ctl_load (cr6, 6, 6); |
738 | ||
739 | do { | |
2ec22984 | 740 | spin_unlock(console_subchannel.lock); |
1da177e4 LT |
741 | if (!cio_tpi()) |
742 | cpu_relax(); | |
2ec22984 | 743 | spin_lock(console_subchannel.lock); |
23d805b6 | 744 | } while (console_subchannel.schib.scsw.cmd.actl != 0); |
1da177e4 LT |
745 | /* |
746 | * restore previous isc value | |
747 | */ | |
748 | __ctl_load (save_cr6, 6, 6); | |
749 | } | |
750 | ||
751 | static int | |
f97a56fb CH |
752 | cio_test_for_console(struct subchannel_id schid, void *data) |
753 | { | |
fb6958a5 | 754 | if (stsch_err(schid, &console_subchannel.schib) != 0) |
f97a56fb | 755 | return -ENXIO; |
b279a4f5 CH |
756 | if ((console_subchannel.schib.pmcw.st == SUBCHANNEL_TYPE_IO) && |
757 | console_subchannel.schib.pmcw.dnv && | |
758 | (console_subchannel.schib.pmcw.dev == console_devno)) { | |
f97a56fb CH |
759 | console_irq = schid.sch_no; |
760 | return 1; /* found */ | |
761 | } | |
762 | return 0; | |
763 | } | |
764 | ||
765 | ||
766 | static int | |
767 | cio_get_console_sch_no(void) | |
1da177e4 | 768 | { |
a8237fc4 | 769 | struct subchannel_id schid; |
1da177e4 | 770 | |
a8237fc4 | 771 | init_subchannel_id(&schid); |
1da177e4 LT |
772 | if (console_irq != -1) { |
773 | /* VM provided us with the irq number of the console. */ | |
a8237fc4 | 774 | schid.sch_no = console_irq; |
8821d24c | 775 | if (stsch_err(schid, &console_subchannel.schib) != 0 || |
b279a4f5 | 776 | (console_subchannel.schib.pmcw.st != SUBCHANNEL_TYPE_IO) || |
1da177e4 LT |
777 | !console_subchannel.schib.pmcw.dnv) |
778 | return -1; | |
779 | console_devno = console_subchannel.schib.pmcw.dev; | |
780 | } else if (console_devno != -1) { | |
781 | /* At least the console device number is known. */ | |
f97a56fb | 782 | for_each_subchannel(cio_test_for_console, NULL); |
1da177e4 LT |
783 | if (console_irq == -1) |
784 | return -1; | |
785 | } else { | |
786 | /* unlike in 2.4, we cannot autoprobe here, since | |
787 | * the channel subsystem is not fully initialized. | |
788 | * With some luck, the HWC console can take over */ | |
1da177e4 LT |
789 | return -1; |
790 | } | |
791 | return console_irq; | |
792 | } | |
793 | ||
794 | struct subchannel * | |
795 | cio_probe_console(void) | |
796 | { | |
f97a56fb | 797 | int sch_no, ret; |
a8237fc4 | 798 | struct subchannel_id schid; |
1da177e4 LT |
799 | |
800 | if (xchg(&console_subchannel_in_use, 1) != 0) | |
801 | return ERR_PTR(-EBUSY); | |
f97a56fb CH |
802 | sch_no = cio_get_console_sch_no(); |
803 | if (sch_no == -1) { | |
1da177e4 | 804 | console_subchannel_in_use = 0; |
e6d5a428 | 805 | pr_warning("No CCW console was found\n"); |
1da177e4 LT |
806 | return ERR_PTR(-ENODEV); |
807 | } | |
808 | memset(&console_subchannel, 0, sizeof(struct subchannel)); | |
a8237fc4 | 809 | init_subchannel_id(&schid); |
f97a56fb | 810 | schid.sch_no = sch_no; |
a8237fc4 | 811 | ret = cio_validate_subchannel(&console_subchannel, schid); |
1da177e4 LT |
812 | if (ret) { |
813 | console_subchannel_in_use = 0; | |
814 | return ERR_PTR(-ENODEV); | |
815 | } | |
816 | ||
817 | /* | |
3a3fc29a | 818 | * enable console I/O-interrupt subclass |
1da177e4 | 819 | */ |
6ef556cc | 820 | isc_register(CONSOLE_ISC); |
13952ec1 SO |
821 | console_subchannel.config.isc = CONSOLE_ISC; |
822 | console_subchannel.config.intparm = (u32)(addr_t)&console_subchannel; | |
823 | ret = cio_commit_config(&console_subchannel); | |
1da177e4 | 824 | if (ret) { |
6ef556cc | 825 | isc_unregister(CONSOLE_ISC); |
1da177e4 LT |
826 | console_subchannel_in_use = 0; |
827 | return ERR_PTR(ret); | |
828 | } | |
829 | return &console_subchannel; | |
830 | } | |
831 | ||
832 | void | |
833 | cio_release_console(void) | |
834 | { | |
13952ec1 SO |
835 | console_subchannel.config.intparm = 0; |
836 | cio_commit_config(&console_subchannel); | |
6ef556cc | 837 | isc_unregister(CONSOLE_ISC); |
1da177e4 LT |
838 | console_subchannel_in_use = 0; |
839 | } | |
840 | ||
841 | /* Bah... hack to catch console special sausages. */ | |
842 | int | |
a8237fc4 | 843 | cio_is_console(struct subchannel_id schid) |
1da177e4 LT |
844 | { |
845 | if (!console_subchannel_in_use) | |
846 | return 0; | |
a8237fc4 | 847 | return schid_equal(&schid, &console_subchannel.schid); |
1da177e4 LT |
848 | } |
849 | ||
850 | struct subchannel * | |
851 | cio_get_console_subchannel(void) | |
852 | { | |
853 | if (!console_subchannel_in_use) | |
d2c993d8 | 854 | return NULL; |
1da177e4 LT |
855 | return &console_subchannel; |
856 | } | |
857 | ||
858 | #endif | |
4d284cac | 859 | static int |
a8237fc4 | 860 | __disable_subchannel_easy(struct subchannel_id schid, struct schib *schib) |
1da177e4 LT |
861 | { |
862 | int retry, cc; | |
863 | ||
864 | cc = 0; | |
865 | for (retry=0;retry<3;retry++) { | |
866 | schib->pmcw.ena = 0; | |
8821d24c | 867 | cc = msch_err(schid, schib); |
1da177e4 LT |
868 | if (cc) |
869 | return (cc==3?-ENODEV:-EBUSY); | |
8821d24c | 870 | if (stsch_err(schid, schib) || !css_sch_is_valid(schib)) |
cdb912a4 | 871 | return -ENODEV; |
1da177e4 LT |
872 | if (!schib->pmcw.ena) |
873 | return 0; | |
874 | } | |
875 | return -EBUSY; /* uhm... */ | |
876 | } | |
877 | ||
4d284cac | 878 | static int |
0ae7a7b2 | 879 | __clear_io_subchannel_easy(struct subchannel_id schid) |
1da177e4 LT |
880 | { |
881 | int retry; | |
882 | ||
883 | if (csch(schid)) | |
884 | return -ENODEV; | |
885 | for (retry=0;retry<20;retry++) { | |
886 | struct tpi_info ti; | |
887 | ||
888 | if (tpi(&ti)) { | |
cbb870c8 | 889 | tsch(ti.schid, (struct irb *)&S390_lowcore.irb); |
a8237fc4 | 890 | if (schid_equal(&ti.schid, &schid)) |
4c24da79 | 891 | return 0; |
1da177e4 | 892 | } |
5a0d0e65 | 893 | udelay_simple(100); |
1da177e4 LT |
894 | } |
895 | return -EBUSY; | |
896 | } | |
897 | ||
9d92a7e1 CH |
898 | static void __clear_chsc_subchannel_easy(void) |
899 | { | |
900 | /* It seems we can only wait for a bit here :/ */ | |
5a0d0e65 | 901 | udelay_simple(100); |
9d92a7e1 CH |
902 | } |
903 | ||
a45e1414 MH |
904 | static int pgm_check_occured; |
905 | ||
906 | static void cio_reset_pgm_check_handler(void) | |
907 | { | |
908 | pgm_check_occured = 1; | |
909 | } | |
910 | ||
f9c9fe3e | 911 | static int stsch_reset(struct subchannel_id schid, struct schib *addr) |
a45e1414 MH |
912 | { |
913 | int rc; | |
914 | ||
915 | pgm_check_occured = 0; | |
ab14de6c | 916 | s390_base_pgm_handler_fn = cio_reset_pgm_check_handler; |
8821d24c | 917 | rc = stsch_err(schid, addr); |
ab14de6c | 918 | s390_base_pgm_handler_fn = NULL; |
aa77015c | 919 | |
ab14de6c | 920 | /* The program check handler could have changed pgm_check_occured. */ |
6faf4444 | 921 | barrier(); |
aa77015c | 922 | |
a45e1414 MH |
923 | if (pgm_check_occured) |
924 | return -EIO; | |
925 | else | |
926 | return rc; | |
927 | } | |
928 | ||
15e9b586 | 929 | static int __shutdown_subchannel_easy(struct subchannel_id schid, void *data) |
f97a56fb CH |
930 | { |
931 | struct schib schib; | |
932 | ||
a45e1414 | 933 | if (stsch_reset(schid, &schib)) |
f97a56fb CH |
934 | return -ENXIO; |
935 | if (!schib.pmcw.ena) | |
936 | return 0; | |
937 | switch(__disable_subchannel_easy(schid, &schib)) { | |
938 | case 0: | |
939 | case -ENODEV: | |
940 | break; | |
941 | default: /* -EBUSY */ | |
0ae7a7b2 CH |
942 | switch (schib.pmcw.st) { |
943 | case SUBCHANNEL_TYPE_IO: | |
944 | if (__clear_io_subchannel_easy(schid)) | |
945 | goto out; /* give up... */ | |
946 | break; | |
9d92a7e1 CH |
947 | case SUBCHANNEL_TYPE_CHSC: |
948 | __clear_chsc_subchannel_easy(); | |
949 | break; | |
0ae7a7b2 CH |
950 | default: |
951 | /* No default clear strategy */ | |
952 | break; | |
953 | } | |
8821d24c | 954 | stsch_err(schid, &schib); |
f97a56fb CH |
955 | __disable_subchannel_easy(schid, &schib); |
956 | } | |
0ae7a7b2 | 957 | out: |
f97a56fb CH |
958 | return 0; |
959 | } | |
1da177e4 | 960 | |
15e9b586 HC |
961 | static atomic_t chpid_reset_count; |
962 | ||
963 | static void s390_reset_chpids_mcck_handler(void) | |
964 | { | |
965 | struct crw crw; | |
966 | struct mci *mci; | |
967 | ||
968 | /* Check for pending channel report word. */ | |
969 | mci = (struct mci *)&S390_lowcore.mcck_interruption_code; | |
970 | if (!mci->cp) | |
971 | return; | |
972 | /* Process channel report words. */ | |
973 | while (stcrw(&crw) == 0) { | |
974 | /* Check for responses to RCHP. */ | |
975 | if (crw.slct && crw.rsc == CRW_RSC_CPATH) | |
976 | atomic_dec(&chpid_reset_count); | |
977 | } | |
978 | } | |
979 | ||
980 | #define RCHP_TIMEOUT (30 * USEC_PER_SEC) | |
981 | static void css_reset(void) | |
982 | { | |
983 | int i, ret; | |
984 | unsigned long long timeout; | |
f86635fa | 985 | struct chp_id chpid; |
15e9b586 HC |
986 | |
987 | /* Reset subchannels. */ | |
988 | for_each_subchannel(__shutdown_subchannel_easy, NULL); | |
989 | /* Reset channel paths. */ | |
ab14de6c | 990 | s390_base_mcck_handler_fn = s390_reset_chpids_mcck_handler; |
15e9b586 HC |
991 | /* Enable channel report machine checks. */ |
992 | __ctl_set_bit(14, 28); | |
993 | /* Temporarily reenable machine checks. */ | |
994 | local_mcck_enable(); | |
f86635fa | 995 | chp_id_init(&chpid); |
15e9b586 | 996 | for (i = 0; i <= __MAX_CHPID; i++) { |
f86635fa PO |
997 | chpid.id = i; |
998 | ret = rchp(chpid); | |
15e9b586 HC |
999 | if ((ret == 0) || (ret == 2)) |
1000 | /* | |
1001 | * rchp either succeeded, or another rchp is already | |
1002 | * in progress. In either case, we'll get a crw. | |
1003 | */ | |
1004 | atomic_inc(&chpid_reset_count); | |
1005 | } | |
1006 | /* Wait for machine check for all channel paths. */ | |
1007 | timeout = get_clock() + (RCHP_TIMEOUT << 12); | |
1008 | while (atomic_read(&chpid_reset_count) != 0) { | |
1009 | if (get_clock() > timeout) | |
1010 | break; | |
1011 | cpu_relax(); | |
1012 | } | |
1013 | /* Disable machine checks again. */ | |
1014 | local_mcck_disable(); | |
1015 | /* Disable channel report machine checks. */ | |
1016 | __ctl_clear_bit(14, 28); | |
ab14de6c | 1017 | s390_base_mcck_handler_fn = NULL; |
15e9b586 HC |
1018 | } |
1019 | ||
1020 | static struct reset_call css_reset_call = { | |
1021 | .fn = css_reset, | |
1022 | }; | |
1023 | ||
1024 | static int __init init_css_reset_call(void) | |
1025 | { | |
1026 | atomic_set(&chpid_reset_count, 0); | |
1027 | register_reset_call(&css_reset_call); | |
1028 | return 0; | |
1029 | } | |
1030 | ||
1031 | arch_initcall(init_css_reset_call); | |
1032 | ||
1033 | struct sch_match_id { | |
1034 | struct subchannel_id schid; | |
1035 | struct ccw_dev_id devid; | |
1036 | int rc; | |
1037 | }; | |
1038 | ||
1039 | static int __reipl_subchannel_match(struct subchannel_id schid, void *data) | |
1040 | { | |
1041 | struct schib schib; | |
1042 | struct sch_match_id *match_id = data; | |
1043 | ||
a45e1414 | 1044 | if (stsch_reset(schid, &schib)) |
15e9b586 | 1045 | return -ENXIO; |
b279a4f5 | 1046 | if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv && |
15e9b586 HC |
1047 | (schib.pmcw.dev == match_id->devid.devno) && |
1048 | (schid.ssid == match_id->devid.ssid)) { | |
1049 | match_id->schid = schid; | |
1050 | match_id->rc = 0; | |
1051 | return 1; | |
1052 | } | |
1053 | return 0; | |
1054 | } | |
1055 | ||
1056 | static int reipl_find_schid(struct ccw_dev_id *devid, | |
1057 | struct subchannel_id *schid) | |
1da177e4 | 1058 | { |
ff6b8ea6 MH |
1059 | struct sch_match_id match_id; |
1060 | ||
1061 | match_id.devid = *devid; | |
1062 | match_id.rc = -ENODEV; | |
15e9b586 | 1063 | for_each_subchannel(__reipl_subchannel_match, &match_id); |
ff6b8ea6 MH |
1064 | if (match_id.rc == 0) |
1065 | *schid = match_id.schid; | |
1066 | return match_id.rc; | |
1da177e4 LT |
1067 | } |
1068 | ||
ff6b8ea6 MH |
1069 | extern void do_reipl_asm(__u32 schid); |
1070 | ||
1da177e4 | 1071 | /* Make sure all subchannels are quiet before we re-ipl an lpar. */ |
ff6b8ea6 | 1072 | void reipl_ccw_dev(struct ccw_dev_id *devid) |
1da177e4 | 1073 | { |
ff6b8ea6 MH |
1074 | struct subchannel_id schid; |
1075 | ||
15e9b586 HC |
1076 | s390_reset_system(); |
1077 | if (reipl_find_schid(devid, &schid) != 0) | |
ff6b8ea6 | 1078 | panic("IPL Device not found\n"); |
ff6b8ea6 | 1079 | do_reipl_asm(*((__u32*)&schid)); |
1da177e4 | 1080 | } |
e87bfe51 | 1081 | |
6fc321fd | 1082 | int __init cio_get_iplinfo(struct cio_iplinfo *iplinfo) |
e87bfe51 HC |
1083 | { |
1084 | struct subchannel_id schid; | |
6fc321fd | 1085 | struct schib schib; |
e87bfe51 | 1086 | |
cbb870c8 | 1087 | schid = *(struct subchannel_id *)&S390_lowcore.subchannel_id; |
e87bfe51 | 1088 | if (!schid.one) |
6fc321fd | 1089 | return -ENODEV; |
8821d24c | 1090 | if (stsch_err(schid, &schib)) |
6fc321fd | 1091 | return -ENODEV; |
b279a4f5 CH |
1092 | if (schib.pmcw.st != SUBCHANNEL_TYPE_IO) |
1093 | return -ENODEV; | |
6fc321fd HC |
1094 | if (!schib.pmcw.dnv) |
1095 | return -ENODEV; | |
1096 | iplinfo->devno = schib.pmcw.dev; | |
1097 | iplinfo->is_qdio = schib.pmcw.qf; | |
1098 | return 0; | |
e87bfe51 | 1099 | } |
83262d63 PO |
1100 | |
1101 | /** | |
1102 | * cio_tm_start_key - perform start function | |
1103 | * @sch: subchannel on which to perform the start function | |
1104 | * @tcw: transport-command word to be started | |
1105 | * @lpm: mask of paths to use | |
1106 | * @key: storage key to use for storage access | |
1107 | * | |
1108 | * Start the tcw on the given subchannel. Return zero on success, non-zero | |
1109 | * otherwise. | |
1110 | */ | |
1111 | int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key) | |
1112 | { | |
1113 | int cc; | |
1114 | union orb *orb = &to_io_private(sch)->orb; | |
1115 | ||
1116 | memset(orb, 0, sizeof(union orb)); | |
1117 | orb->tm.intparm = (u32) (addr_t) sch; | |
1118 | orb->tm.key = key >> 4; | |
1119 | orb->tm.b = 1; | |
1120 | orb->tm.lpm = lpm ? lpm : sch->lpm; | |
1121 | orb->tm.tcw = (u32) (addr_t) tcw; | |
1122 | cc = ssch(sch->schid, orb); | |
1123 | switch (cc) { | |
1124 | case 0: | |
1125 | return 0; | |
1126 | case 1: | |
1127 | case 2: | |
1128 | return -EBUSY; | |
1129 | default: | |
1130 | return cio_start_handle_notoper(sch, lpm); | |
1131 | } | |
1132 | } | |
1133 | ||
1134 | /** | |
1135 | * cio_tm_intrg - perform interrogate function | |
1136 | * @sch - subchannel on which to perform the interrogate function | |
1137 | * | |
1138 | * If the specified subchannel is running in transport-mode, perform the | |
1139 | * interrogate function. Return zero on success, non-zero otherwie. | |
1140 | */ | |
1141 | int cio_tm_intrg(struct subchannel *sch) | |
1142 | { | |
1143 | int cc; | |
1144 | ||
1145 | if (!to_io_private(sch)->orb.tm.b) | |
1146 | return -EINVAL; | |
1147 | cc = xsch(sch->schid); | |
1148 | switch (cc) { | |
1149 | case 0: | |
1150 | case 2: | |
1151 | return 0; | |
1152 | case 1: | |
1153 | return -EBUSY; | |
1154 | default: | |
1155 | return -ENODEV; | |
1156 | } | |
1157 | } |