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724117b7 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | /* |
1da177e4 | 3 | * S/390 common I/O routines -- low level i/o calls |
1da177e4 | 4 | * |
a53c8fab | 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> | |
257ceab7 | 22 | #include <linux/irq.h> |
1da177e4 LT |
23 | #include <asm/cio.h> |
24 | #include <asm/delay.h> | |
25 | #include <asm/irq.h> | |
5a489b98 | 26 | #include <asm/irq_regs.h> |
e87bfe51 | 27 | #include <asm/setup.h> |
15e9b586 | 28 | #include <asm/reset.h> |
46b05d26 | 29 | #include <asm/ipl.h> |
e5854a58 | 30 | #include <asm/chpid.h> |
4e8e56c6 | 31 | #include <asm/airq.h> |
3a3fc29a | 32 | #include <asm/isc.h> |
32ef5517 | 33 | #include <linux/sched/cputime.h> |
83262d63 | 34 | #include <asm/fcx.h> |
f5daba1d HC |
35 | #include <asm/nmi.h> |
36 | #include <asm/crw.h> | |
1da177e4 LT |
37 | #include "cio.h" |
38 | #include "css.h" | |
39 | #include "chsc.h" | |
40 | #include "ioasm.h" | |
cd6b4f27 | 41 | #include "io_sch.h" |
1da177e4 LT |
42 | #include "blacklist.h" |
43 | #include "cio_debug.h" | |
e6b6e10a | 44 | #include "chp.h" |
42248979 | 45 | #include "trace.h" |
1da177e4 LT |
46 | |
47 | debug_info_t *cio_debug_msg_id; | |
48 | debug_info_t *cio_debug_trace_id; | |
49 | debug_info_t *cio_debug_crw_id; | |
50 | ||
63aef00b MS |
51 | DEFINE_PER_CPU_ALIGNED(struct irb, cio_irb); |
52 | EXPORT_PER_CPU_SYMBOL(cio_irb); | |
53 | ||
1da177e4 LT |
54 | /* |
55 | * Function: cio_debug_init | |
bc698bcf CH |
56 | * Initializes three debug logs for common I/O: |
57 | * - cio_msg logs generic cio messages | |
1da177e4 | 58 | * - cio_trace logs the calling of different functions |
bc698bcf | 59 | * - cio_crw logs machine check related cio messages |
1da177e4 | 60 | */ |
bc698bcf | 61 | static int __init cio_debug_init(void) |
1da177e4 | 62 | { |
f7e1e65d | 63 | cio_debug_msg_id = debug_register("cio_msg", 16, 1, 11 * sizeof(long)); |
1da177e4 LT |
64 | if (!cio_debug_msg_id) |
65 | goto out_unregister; | |
bc698bcf CH |
66 | debug_register_view(cio_debug_msg_id, &debug_sprintf_view); |
67 | debug_set_level(cio_debug_msg_id, 2); | |
361f494d | 68 | cio_debug_trace_id = debug_register("cio_trace", 16, 1, 16); |
1da177e4 LT |
69 | if (!cio_debug_trace_id) |
70 | goto out_unregister; | |
bc698bcf CH |
71 | debug_register_view(cio_debug_trace_id, &debug_hex_ascii_view); |
72 | debug_set_level(cio_debug_trace_id, 2); | |
f7e1e65d | 73 | cio_debug_crw_id = debug_register("cio_crw", 8, 1, 8 * sizeof(long)); |
1da177e4 LT |
74 | if (!cio_debug_crw_id) |
75 | goto out_unregister; | |
bc698bcf CH |
76 | debug_register_view(cio_debug_crw_id, &debug_sprintf_view); |
77 | debug_set_level(cio_debug_crw_id, 4); | |
1da177e4 LT |
78 | return 0; |
79 | ||
80 | out_unregister: | |
a6e975c5 ME |
81 | debug_unregister(cio_debug_msg_id); |
82 | debug_unregister(cio_debug_trace_id); | |
83 | debug_unregister(cio_debug_crw_id); | |
1da177e4 LT |
84 | return -1; |
85 | } | |
86 | ||
87 | arch_initcall (cio_debug_init); | |
88 | ||
c513d07a | 89 | int cio_set_options(struct subchannel *sch, int flags) |
1da177e4 | 90 | { |
c513d07a | 91 | struct io_subchannel_private *priv = to_io_private(sch); |
1da177e4 | 92 | |
c513d07a SO |
93 | priv->options.suspend = (flags & DOIO_ALLOW_SUSPEND) != 0; |
94 | priv->options.prefetch = (flags & DOIO_DENY_PREFETCH) != 0; | |
95 | priv->options.inter = (flags & DOIO_SUPPRESS_INTER) != 0; | |
96 | return 0; | |
1da177e4 LT |
97 | } |
98 | ||
4d284cac | 99 | static int |
1da177e4 LT |
100 | cio_start_handle_notoper(struct subchannel *sch, __u8 lpm) |
101 | { | |
102 | char dbf_text[15]; | |
103 | ||
104 | if (lpm != 0) | |
105 | sch->lpm &= ~lpm; | |
106 | else | |
107 | sch->lpm = 0; | |
108 | ||
139b83dd | 109 | CIO_MSG_EVENT(2, "cio_start: 'not oper' status for " |
fb6958a5 CH |
110 | "subchannel 0.%x.%04x!\n", sch->schid.ssid, |
111 | sch->schid.sch_no); | |
cdb912a4 SO |
112 | |
113 | if (cio_update_schib(sch)) | |
114 | return -ENODEV; | |
115 | ||
2a0217d5 | 116 | sprintf(dbf_text, "no%s", dev_name(&sch->dev)); |
1da177e4 LT |
117 | CIO_TRACE_EVENT(0, dbf_text); |
118 | CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib)); | |
119 | ||
120 | return (sch->lpm ? -EACCES : -ENODEV); | |
121 | } | |
122 | ||
123 | int | |
124 | cio_start_key (struct subchannel *sch, /* subchannel structure */ | |
125 | struct ccw1 * cpa, /* logical channel prog addr */ | |
126 | __u8 lpm, /* logical path mask */ | |
127 | __u8 key) /* storage key */ | |
128 | { | |
c513d07a SO |
129 | struct io_subchannel_private *priv = to_io_private(sch); |
130 | union orb *orb = &priv->orb; | |
1da177e4 LT |
131 | int ccode; |
132 | ||
efd986db SO |
133 | CIO_TRACE_EVENT(5, "stIO"); |
134 | CIO_TRACE_EVENT(5, dev_name(&sch->dev)); | |
1da177e4 | 135 | |
9adb8c1d | 136 | memset(orb, 0, sizeof(union orb)); |
1da177e4 | 137 | /* sch is always under 2G. */ |
83262d63 PO |
138 | orb->cmd.intparm = (u32)(addr_t)sch; |
139 | orb->cmd.fmt = 1; | |
1da177e4 | 140 | |
c513d07a SO |
141 | orb->cmd.pfch = priv->options.prefetch == 0; |
142 | orb->cmd.spnd = priv->options.suspend; | |
143 | orb->cmd.ssic = priv->options.suspend && priv->options.inter; | |
83262d63 | 144 | orb->cmd.lpm = (lpm != 0) ? lpm : sch->lpm; |
1da177e4 LT |
145 | /* |
146 | * for 64 bit we always support 64 bit IDAWs with 4k page size only | |
147 | */ | |
83262d63 PO |
148 | orb->cmd.c64 = 1; |
149 | orb->cmd.i2k = 0; | |
83262d63 | 150 | orb->cmd.key = key >> 4; |
1da177e4 | 151 | /* issue "Start Subchannel" */ |
83262d63 | 152 | orb->cmd.cpa = (__u32) __pa(cpa); |
cd6b4f27 | 153 | ccode = ssch(sch->schid, orb); |
1da177e4 LT |
154 | |
155 | /* process condition code */ | |
efd986db | 156 | CIO_HEX_EVENT(5, &ccode, sizeof(ccode)); |
1da177e4 LT |
157 | |
158 | switch (ccode) { | |
159 | case 0: | |
160 | /* | |
161 | * initialize device status information | |
162 | */ | |
23d805b6 | 163 | sch->schib.scsw.cmd.actl |= SCSW_ACTL_START_PEND; |
1da177e4 LT |
164 | return 0; |
165 | case 1: /* status pending */ | |
166 | case 2: /* busy */ | |
167 | return -EBUSY; | |
c91ebe49 | 168 | case 3: /* device/path not operational */ |
1da177e4 | 169 | return cio_start_handle_notoper(sch, lpm); |
c91ebe49 CH |
170 | default: |
171 | return ccode; | |
1da177e4 LT |
172 | } |
173 | } | |
a22217e2 | 174 | EXPORT_SYMBOL_GPL(cio_start_key); |
1da177e4 LT |
175 | |
176 | int | |
177 | cio_start (struct subchannel *sch, struct ccw1 *cpa, __u8 lpm) | |
178 | { | |
0b642ede | 179 | return cio_start_key(sch, cpa, lpm, PAGE_DEFAULT_KEY); |
1da177e4 | 180 | } |
a22217e2 | 181 | EXPORT_SYMBOL_GPL(cio_start); |
1da177e4 LT |
182 | |
183 | /* | |
184 | * resume suspended I/O operation | |
185 | */ | |
186 | int | |
187 | cio_resume (struct subchannel *sch) | |
188 | { | |
1da177e4 LT |
189 | int ccode; |
190 | ||
efd986db | 191 | CIO_TRACE_EVENT(4, "resIO"); |
2a0217d5 | 192 | CIO_TRACE_EVENT(4, dev_name(&sch->dev)); |
1da177e4 | 193 | |
a8237fc4 | 194 | ccode = rsch (sch->schid); |
1da177e4 | 195 | |
efd986db | 196 | CIO_HEX_EVENT(4, &ccode, sizeof(ccode)); |
1da177e4 LT |
197 | |
198 | switch (ccode) { | |
199 | case 0: | |
23d805b6 | 200 | sch->schib.scsw.cmd.actl |= SCSW_ACTL_RESUME_PEND; |
1da177e4 LT |
201 | return 0; |
202 | case 1: | |
203 | return -EBUSY; | |
204 | case 2: | |
205 | return -EINVAL; | |
206 | default: | |
207 | /* | |
208 | * useless to wait for request completion | |
209 | * as device is no longer operational ! | |
210 | */ | |
211 | return -ENODEV; | |
212 | } | |
213 | } | |
a22217e2 | 214 | EXPORT_SYMBOL_GPL(cio_resume); |
1da177e4 LT |
215 | |
216 | /* | |
217 | * halt I/O operation | |
218 | */ | |
219 | int | |
220 | cio_halt(struct subchannel *sch) | |
221 | { | |
1da177e4 LT |
222 | int ccode; |
223 | ||
224 | if (!sch) | |
225 | return -ENODEV; | |
226 | ||
efd986db | 227 | CIO_TRACE_EVENT(2, "haltIO"); |
2a0217d5 | 228 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 LT |
229 | |
230 | /* | |
231 | * Issue "Halt subchannel" and process condition code | |
232 | */ | |
a8237fc4 | 233 | ccode = hsch (sch->schid); |
1da177e4 | 234 | |
efd986db | 235 | CIO_HEX_EVENT(2, &ccode, sizeof(ccode)); |
1da177e4 LT |
236 | |
237 | switch (ccode) { | |
238 | case 0: | |
23d805b6 | 239 | sch->schib.scsw.cmd.actl |= SCSW_ACTL_HALT_PEND; |
1da177e4 LT |
240 | return 0; |
241 | case 1: /* status pending */ | |
242 | case 2: /* busy */ | |
243 | return -EBUSY; | |
244 | default: /* device not operational */ | |
245 | return -ENODEV; | |
246 | } | |
247 | } | |
a22217e2 | 248 | EXPORT_SYMBOL_GPL(cio_halt); |
1da177e4 LT |
249 | |
250 | /* | |
251 | * Clear I/O operation | |
252 | */ | |
253 | int | |
254 | cio_clear(struct subchannel *sch) | |
255 | { | |
1da177e4 LT |
256 | int ccode; |
257 | ||
258 | if (!sch) | |
259 | return -ENODEV; | |
260 | ||
efd986db | 261 | CIO_TRACE_EVENT(2, "clearIO"); |
2a0217d5 | 262 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 LT |
263 | |
264 | /* | |
265 | * Issue "Clear subchannel" and process condition code | |
266 | */ | |
a8237fc4 | 267 | ccode = csch (sch->schid); |
1da177e4 | 268 | |
efd986db | 269 | CIO_HEX_EVENT(2, &ccode, sizeof(ccode)); |
1da177e4 LT |
270 | |
271 | switch (ccode) { | |
272 | case 0: | |
23d805b6 | 273 | sch->schib.scsw.cmd.actl |= SCSW_ACTL_CLEAR_PEND; |
1da177e4 LT |
274 | return 0; |
275 | default: /* device not operational */ | |
276 | return -ENODEV; | |
277 | } | |
278 | } | |
a22217e2 | 279 | EXPORT_SYMBOL_GPL(cio_clear); |
1da177e4 LT |
280 | |
281 | /* | |
282 | * Function: cio_cancel | |
283 | * Issues a "Cancel Subchannel" on the specified subchannel | |
284 | * Note: We don't need any fancy intparms and flags here | |
285 | * since xsch is executed synchronously. | |
286 | * Only for common I/O internal use as for now. | |
287 | */ | |
288 | int | |
289 | cio_cancel (struct subchannel *sch) | |
290 | { | |
1da177e4 LT |
291 | int ccode; |
292 | ||
293 | if (!sch) | |
294 | return -ENODEV; | |
295 | ||
efd986db | 296 | CIO_TRACE_EVENT(2, "cancelIO"); |
2a0217d5 | 297 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 | 298 | |
a8237fc4 | 299 | ccode = xsch (sch->schid); |
1da177e4 | 300 | |
efd986db | 301 | CIO_HEX_EVENT(2, &ccode, sizeof(ccode)); |
1da177e4 LT |
302 | |
303 | switch (ccode) { | |
304 | case 0: /* success */ | |
305 | /* Update information in scsw. */ | |
cdb912a4 SO |
306 | if (cio_update_schib(sch)) |
307 | return -ENODEV; | |
1da177e4 LT |
308 | return 0; |
309 | case 1: /* status pending */ | |
310 | return -EBUSY; | |
311 | case 2: /* not applicable */ | |
312 | return -EINVAL; | |
313 | default: /* not oper */ | |
314 | return -ENODEV; | |
315 | } | |
316 | } | |
a22217e2 | 317 | EXPORT_SYMBOL_GPL(cio_cancel); |
1da177e4 | 318 | |
5434da4d DJS |
319 | /** |
320 | * cio_cancel_halt_clear - Cancel running I/O by performing cancel, halt | |
321 | * and clear ordinally if subchannel is valid. | |
322 | * @sch: subchannel on which to perform the cancel_halt_clear operation | |
323 | * @iretry: the number of the times remained to retry the next operation | |
324 | * | |
325 | * This should be called repeatedly since halt/clear are asynchronous | |
326 | * operations. We do one try with cio_cancel, three tries with cio_halt, | |
327 | * 255 tries with cio_clear. The caller should initialize @iretry with | |
328 | * the value 255 for its first call to this, and keep using the same | |
329 | * @iretry in the subsequent calls until it gets a non -EBUSY return. | |
330 | * | |
331 | * Returns 0 if device now idle, -ENODEV for device not operational, | |
332 | * -EBUSY if an interrupt is expected (either from halt/clear or from a | |
333 | * status pending), and -EIO if out of retries. | |
334 | */ | |
335 | int cio_cancel_halt_clear(struct subchannel *sch, int *iretry) | |
336 | { | |
337 | int ret; | |
338 | ||
339 | if (cio_update_schib(sch)) | |
340 | return -ENODEV; | |
341 | if (!sch->schib.pmcw.ena) | |
342 | /* Not operational -> done. */ | |
343 | return 0; | |
344 | /* Stage 1: cancel io. */ | |
345 | if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_HALT_PEND) && | |
346 | !(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) { | |
347 | if (!scsw_is_tm(&sch->schib.scsw)) { | |
348 | ret = cio_cancel(sch); | |
349 | if (ret != -EINVAL) | |
350 | return ret; | |
351 | } | |
352 | /* | |
353 | * Cancel io unsuccessful or not applicable (transport mode). | |
354 | * Continue with asynchronous instructions. | |
355 | */ | |
356 | *iretry = 3; /* 3 halt retries. */ | |
357 | } | |
358 | /* Stage 2: halt io. */ | |
359 | if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) { | |
360 | if (*iretry) { | |
361 | *iretry -= 1; | |
362 | ret = cio_halt(sch); | |
363 | if (ret != -EBUSY) | |
364 | return (ret == 0) ? -EBUSY : ret; | |
365 | } | |
366 | /* Halt io unsuccessful. */ | |
367 | *iretry = 255; /* 255 clear retries. */ | |
368 | } | |
369 | /* Stage 3: clear io. */ | |
370 | if (*iretry) { | |
371 | *iretry -= 1; | |
372 | ret = cio_clear(sch); | |
373 | return (ret == 0) ? -EBUSY : ret; | |
374 | } | |
375 | /* Function was unsuccessful */ | |
376 | return -EIO; | |
377 | } | |
a22217e2 | 378 | EXPORT_SYMBOL_GPL(cio_cancel_halt_clear); |
13952ec1 SO |
379 | |
380 | static void cio_apply_config(struct subchannel *sch, struct schib *schib) | |
381 | { | |
382 | schib->pmcw.intparm = sch->config.intparm; | |
383 | schib->pmcw.mbi = sch->config.mbi; | |
384 | schib->pmcw.isc = sch->config.isc; | |
385 | schib->pmcw.ena = sch->config.ena; | |
386 | schib->pmcw.mme = sch->config.mme; | |
387 | schib->pmcw.mp = sch->config.mp; | |
388 | schib->pmcw.csense = sch->config.csense; | |
389 | schib->pmcw.mbfc = sch->config.mbfc; | |
390 | if (sch->config.mbfc) | |
391 | schib->mba = sch->config.mba; | |
392 | } | |
393 | ||
394 | static int cio_check_config(struct subchannel *sch, struct schib *schib) | |
395 | { | |
396 | return (schib->pmcw.intparm == sch->config.intparm) && | |
397 | (schib->pmcw.mbi == sch->config.mbi) && | |
398 | (schib->pmcw.isc == sch->config.isc) && | |
399 | (schib->pmcw.ena == sch->config.ena) && | |
400 | (schib->pmcw.mme == sch->config.mme) && | |
401 | (schib->pmcw.mp == sch->config.mp) && | |
402 | (schib->pmcw.csense == sch->config.csense) && | |
403 | (schib->pmcw.mbfc == sch->config.mbfc) && | |
404 | (!sch->config.mbfc || (schib->mba == sch->config.mba)); | |
405 | } | |
406 | ||
1da177e4 | 407 | /* |
13952ec1 | 408 | * cio_commit_config - apply configuration to the subchannel |
1da177e4 | 409 | */ |
13952ec1 | 410 | int cio_commit_config(struct subchannel *sch) |
1da177e4 | 411 | { |
13952ec1 | 412 | int ccode, retry, ret = 0; |
1bc8927c SO |
413 | struct schib schib; |
414 | struct irb irb; | |
13952ec1 | 415 | |
62e65da9 | 416 | if (stsch(sch->schid, &schib) || !css_sch_is_valid(&schib)) |
13952ec1 | 417 | return -ENODEV; |
1da177e4 | 418 | |
1da177e4 | 419 | for (retry = 0; retry < 5; retry++) { |
13952ec1 SO |
420 | /* copy desired changes to local schib */ |
421 | cio_apply_config(sch, &schib); | |
62e65da9 | 422 | ccode = msch(sch->schid, &schib); |
13952ec1 | 423 | if (ccode < 0) /* -EIO if msch gets a program check. */ |
1da177e4 LT |
424 | return ccode; |
425 | switch (ccode) { | |
73ac36ea | 426 | case 0: /* successful */ |
62e65da9 | 427 | if (stsch(sch->schid, &schib) || |
13952ec1 SO |
428 | !css_sch_is_valid(&schib)) |
429 | return -ENODEV; | |
430 | if (cio_check_config(sch, &schib)) { | |
431 | /* commit changes from local schib */ | |
432 | memcpy(&sch->schib, &schib, sizeof(schib)); | |
433 | return 0; | |
434 | } | |
435 | ret = -EAGAIN; | |
436 | break; | |
437 | case 1: /* status pending */ | |
1bc8927c SO |
438 | ret = -EBUSY; |
439 | if (tsch(sch->schid, &irb)) | |
440 | return ret; | |
441 | break; | |
13952ec1 SO |
442 | case 2: /* busy */ |
443 | udelay(100); /* allow for recovery */ | |
1da177e4 LT |
444 | ret = -EBUSY; |
445 | break; | |
13952ec1 | 446 | case 3: /* not operational */ |
1da177e4 LT |
447 | return -ENODEV; |
448 | } | |
449 | } | |
450 | return ret; | |
451 | } | |
a22217e2 | 452 | EXPORT_SYMBOL_GPL(cio_commit_config); |
1da177e4 | 453 | |
cdb912a4 SO |
454 | /** |
455 | * cio_update_schib - Perform stsch and update schib if subchannel is valid. | |
456 | * @sch: subchannel on which to perform stsch | |
457 | * Return zero on success, -ENODEV otherwise. | |
458 | */ | |
459 | int cio_update_schib(struct subchannel *sch) | |
460 | { | |
461 | struct schib schib; | |
462 | ||
62e65da9 | 463 | if (stsch(sch->schid, &schib) || !css_sch_is_valid(&schib)) |
cdb912a4 SO |
464 | return -ENODEV; |
465 | ||
466 | memcpy(&sch->schib, &schib, sizeof(schib)); | |
467 | return 0; | |
468 | } | |
469 | EXPORT_SYMBOL_GPL(cio_update_schib); | |
470 | ||
44a1c19e CH |
471 | /** |
472 | * cio_enable_subchannel - enable a subchannel. | |
473 | * @sch: subchannel to be enabled | |
474 | * @intparm: interruption parameter to set | |
1da177e4 | 475 | */ |
edf22096 | 476 | int cio_enable_subchannel(struct subchannel *sch, u32 intparm) |
1da177e4 | 477 | { |
1da177e4 LT |
478 | int ret; |
479 | ||
efd986db | 480 | CIO_TRACE_EVENT(2, "ensch"); |
2a0217d5 | 481 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 | 482 | |
d7b5a4c9 CH |
483 | if (sch_is_pseudo_sch(sch)) |
484 | return -EINVAL; | |
cdb912a4 | 485 | if (cio_update_schib(sch)) |
1da177e4 LT |
486 | return -ENODEV; |
487 | ||
13952ec1 SO |
488 | sch->config.ena = 1; |
489 | sch->config.isc = sch->isc; | |
490 | sch->config.intparm = intparm; | |
491 | ||
1bc8927c SO |
492 | ret = cio_commit_config(sch); |
493 | if (ret == -EIO) { | |
494 | /* | |
495 | * Got a program check in msch. Try without | |
496 | * the concurrent sense bit the next time. | |
497 | */ | |
498 | sch->config.csense = 0; | |
13952ec1 | 499 | ret = cio_commit_config(sch); |
1da177e4 | 500 | } |
efd986db | 501 | CIO_HEX_EVENT(2, &ret, sizeof(ret)); |
1da177e4 LT |
502 | return ret; |
503 | } | |
44a1c19e | 504 | EXPORT_SYMBOL_GPL(cio_enable_subchannel); |
1da177e4 | 505 | |
44a1c19e CH |
506 | /** |
507 | * cio_disable_subchannel - disable a subchannel. | |
508 | * @sch: subchannel to disable | |
1da177e4 | 509 | */ |
44a1c19e | 510 | int cio_disable_subchannel(struct subchannel *sch) |
1da177e4 | 511 | { |
1da177e4 LT |
512 | int ret; |
513 | ||
efd986db | 514 | CIO_TRACE_EVENT(2, "dissch"); |
2a0217d5 | 515 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 | 516 | |
d7b5a4c9 CH |
517 | if (sch_is_pseudo_sch(sch)) |
518 | return 0; | |
cdb912a4 | 519 | if (cio_update_schib(sch)) |
1da177e4 LT |
520 | return -ENODEV; |
521 | ||
13952ec1 | 522 | sch->config.ena = 0; |
1bc8927c | 523 | ret = cio_commit_config(sch); |
13952ec1 | 524 | |
efd986db | 525 | CIO_HEX_EVENT(2, &ret, sizeof(ret)); |
1da177e4 LT |
526 | return ret; |
527 | } | |
44a1c19e | 528 | EXPORT_SYMBOL_GPL(cio_disable_subchannel); |
1da177e4 | 529 | |
b3a686f4 | 530 | static int cio_check_devno_blacklisted(struct subchannel *sch) |
0ae7a7b2 | 531 | { |
0ae7a7b2 CH |
532 | if (is_blacklisted(sch->schid.ssid, sch->schib.pmcw.dev)) { |
533 | /* | |
534 | * This device must not be known to Linux. So we simply | |
535 | * say that there is no device and return ENODEV. | |
536 | */ | |
537 | CIO_MSG_EVENT(6, "Blacklisted device detected " | |
538 | "at devno %04X, subchannel set %x\n", | |
539 | sch->schib.pmcw.dev, sch->schid.ssid); | |
540 | return -ENODEV; | |
541 | } | |
542 | return 0; | |
543 | } | |
544 | ||
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 | 565 | |
1da177e4 LT |
566 | /* |
567 | * The first subchannel that is not-operational (ccode==3) | |
e5dcf002 | 568 | * indicates that there aren't any more devices available. |
fb6958a5 | 569 | * If stsch gets an exception, it means the current subchannel set |
e5dcf002 | 570 | * is not valid. |
1da177e4 | 571 | */ |
62e65da9 | 572 | ccode = stsch(schid, &sch->schib); |
2ec22984 CH |
573 | if (ccode) { |
574 | err = (ccode == 3) ? -ENXIO : ccode; | |
575 | goto out; | |
576 | } | |
1da177e4 | 577 | sch->st = sch->schib.pmcw.st; |
e5dcf002 | 578 | sch->schid = schid; |
c820de39 | 579 | |
0ae7a7b2 CH |
580 | switch (sch->st) { |
581 | case SUBCHANNEL_TYPE_IO: | |
b3a686f4 | 582 | case SUBCHANNEL_TYPE_MSG: |
e510f681 PM |
583 | if (!css_sch_is_valid(&sch->schib)) |
584 | err = -ENODEV; | |
585 | else | |
586 | err = cio_check_devno_blacklisted(sch); | |
b3a686f4 | 587 | break; |
0ae7a7b2 CH |
588 | default: |
589 | err = 0; | |
1da177e4 | 590 | } |
0ae7a7b2 | 591 | if (err) |
808e4888 | 592 | goto out; |
808e4888 | 593 | |
0ae7a7b2 CH |
594 | CIO_MSG_EVENT(4, "Subchannel 0.%x.%04x reports subchannel type %04X\n", |
595 | sch->schid.ssid, sch->schid.sch_no, sch->st); | |
2ec22984 | 596 | out: |
2ec22984 | 597 | return err; |
1da177e4 LT |
598 | } |
599 | ||
600 | /* | |
1f44a225 | 601 | * do_cio_interrupt() handles all normal I/O device IRQ's |
1da177e4 | 602 | */ |
1f44a225 | 603 | static irqreturn_t do_cio_interrupt(int irq, void *dummy) |
1da177e4 | 604 | { |
1f44a225 | 605 | struct tpi_info *tpi_info; |
1da177e4 LT |
606 | struct subchannel *sch; |
607 | struct irb *irb; | |
608 | ||
fe0f4976 | 609 | set_cpu_flag(CIF_NOHZ_DELAY); |
1f44a225 | 610 | tpi_info = (struct tpi_info *) &get_irq_regs()->int_code; |
42248979 | 611 | trace_s390_cio_interrupt(tpi_info); |
0bf7fcf1 | 612 | irb = this_cpu_ptr(&cio_irb); |
48f6b00c MS |
613 | sch = (struct subchannel *)(unsigned long) tpi_info->intparm; |
614 | if (!sch) { | |
615 | /* Clear pending interrupt condition. */ | |
616 | inc_irq_stat(IRQIO_CIO); | |
617 | tsch(tpi_info->schid, irb); | |
1f44a225 | 618 | return IRQ_HANDLED; |
48f6b00c MS |
619 | } |
620 | spin_lock(sch->lock); | |
621 | /* Store interrupt response block to lowcore. */ | |
622 | if (tsch(tpi_info->schid, irb) == 0) { | |
623 | /* Keep subchannel information word up to date. */ | |
624 | memcpy (&sch->schib.scsw, &irb->scsw, sizeof (irb->scsw)); | |
625 | /* Call interrupt handler if there is one. */ | |
626 | if (sch->driver && sch->driver->irq) | |
627 | sch->driver->irq(sch); | |
628 | else | |
420f42ec | 629 | inc_irq_stat(IRQIO_CIO); |
48f6b00c MS |
630 | } else |
631 | inc_irq_stat(IRQIO_CIO); | |
632 | spin_unlock(sch->lock); | |
1f44a225 MS |
633 | |
634 | return IRQ_HANDLED; | |
635 | } | |
636 | ||
1f44a225 MS |
637 | static struct irqaction io_interrupt = { |
638 | .name = "IO", | |
639 | .handler = do_cio_interrupt, | |
640 | }; | |
641 | ||
642 | void __init init_cio_interrupts(void) | |
643 | { | |
644 | irq_set_chip_and_handler(IO_INTERRUPT, | |
645 | &dummy_irq_chip, handle_percpu_irq); | |
646 | setup_irq(IO_INTERRUPT, &io_interrupt); | |
1da177e4 LT |
647 | } |
648 | ||
649 | #ifdef CONFIG_CCW_CONSOLE | |
863fc849 | 650 | static struct subchannel *console_sch; |
dbe33fc9 | 651 | static struct lock_class_key console_sch_key; |
1da177e4 | 652 | |
191fd44c | 653 | /* |
b603d258 | 654 | * Use cio_tsch to update the subchannel status and call the interrupt handler |
188561a4 | 655 | * if status had been pending. Called with the subchannel's lock held. |
191fd44c | 656 | */ |
188561a4 | 657 | void cio_tsch(struct subchannel *sch) |
191fd44c | 658 | { |
191fd44c HC |
659 | struct irb *irb; |
660 | int irq_context; | |
661 | ||
0bf7fcf1 | 662 | irb = this_cpu_ptr(&cio_irb); |
191fd44c | 663 | /* Store interrupt response block to lowcore. */ |
b603d258 | 664 | if (tsch(sch->schid, irb) != 0) |
191fd44c | 665 | /* Not status pending or not operational. */ |
b603d258 MS |
666 | return; |
667 | memcpy(&sch->schib.scsw, &irb->scsw, sizeof(union scsw)); | |
668 | /* Call interrupt handler with updated status. */ | |
191fd44c | 669 | irq_context = in_interrupt(); |
b603d258 | 670 | if (!irq_context) { |
191fd44c | 671 | local_bh_disable(); |
b603d258 MS |
672 | irq_enter(); |
673 | } | |
bc5dfcff | 674 | kstat_incr_irq_this_cpu(IO_INTERRUPT); |
191fd44c HC |
675 | if (sch->driver && sch->driver->irq) |
676 | sch->driver->irq(sch); | |
de400d6b | 677 | else |
420f42ec | 678 | inc_irq_stat(IRQIO_CIO); |
b603d258 MS |
679 | if (!irq_context) { |
680 | irq_exit(); | |
191fd44c | 681 | _local_bh_enable(); |
b603d258 | 682 | } |
191fd44c HC |
683 | } |
684 | ||
863fc849 | 685 | static int cio_test_for_console(struct subchannel_id schid, void *data) |
cd6b4f27 | 686 | { |
863fc849 | 687 | struct schib schib; |
cd6b4f27 | 688 | |
62e65da9 | 689 | if (stsch(schid, &schib) != 0) |
f97a56fb | 690 | return -ENXIO; |
863fc849 SO |
691 | if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv && |
692 | (schib.pmcw.dev == console_devno)) { | |
f97a56fb CH |
693 | console_irq = schid.sch_no; |
694 | return 1; /* found */ | |
695 | } | |
696 | return 0; | |
697 | } | |
698 | ||
863fc849 | 699 | static int cio_get_console_sch_no(void) |
1da177e4 | 700 | { |
a8237fc4 | 701 | struct subchannel_id schid; |
863fc849 SO |
702 | struct schib schib; |
703 | ||
a8237fc4 | 704 | init_subchannel_id(&schid); |
1da177e4 LT |
705 | if (console_irq != -1) { |
706 | /* VM provided us with the irq number of the console. */ | |
a8237fc4 | 707 | schid.sch_no = console_irq; |
62e65da9 | 708 | if (stsch(schid, &schib) != 0 || |
863fc849 | 709 | (schib.pmcw.st != SUBCHANNEL_TYPE_IO) || !schib.pmcw.dnv) |
1da177e4 | 710 | return -1; |
863fc849 | 711 | console_devno = schib.pmcw.dev; |
1da177e4 LT |
712 | } else if (console_devno != -1) { |
713 | /* At least the console device number is known. */ | |
f97a56fb | 714 | for_each_subchannel(cio_test_for_console, NULL); |
1da177e4 LT |
715 | } |
716 | return console_irq; | |
717 | } | |
718 | ||
863fc849 | 719 | struct subchannel *cio_probe_console(void) |
1da177e4 | 720 | { |
a8237fc4 | 721 | struct subchannel_id schid; |
863fc849 SO |
722 | struct subchannel *sch; |
723 | int sch_no, ret; | |
1da177e4 | 724 | |
f97a56fb CH |
725 | sch_no = cio_get_console_sch_no(); |
726 | if (sch_no == -1) { | |
baebc70a | 727 | pr_warn("No CCW console was found\n"); |
1da177e4 LT |
728 | return ERR_PTR(-ENODEV); |
729 | } | |
a8237fc4 | 730 | init_subchannel_id(&schid); |
f97a56fb | 731 | schid.sch_no = sch_no; |
863fc849 SO |
732 | sch = css_alloc_subchannel(schid); |
733 | if (IS_ERR(sch)) | |
734 | return sch; | |
1da177e4 | 735 | |
dbe33fc9 | 736 | lockdep_set_class(sch->lock, &console_sch_key); |
6ef556cc | 737 | isc_register(CONSOLE_ISC); |
863fc849 SO |
738 | sch->config.isc = CONSOLE_ISC; |
739 | sch->config.intparm = (u32)(addr_t)sch; | |
740 | ret = cio_commit_config(sch); | |
1da177e4 | 741 | if (ret) { |
6ef556cc | 742 | isc_unregister(CONSOLE_ISC); |
863fc849 | 743 | put_device(&sch->dev); |
1da177e4 LT |
744 | return ERR_PTR(ret); |
745 | } | |
863fc849 SO |
746 | console_sch = sch; |
747 | return sch; | |
1da177e4 LT |
748 | } |
749 | ||
863fc849 | 750 | int cio_is_console(struct subchannel_id schid) |
1da177e4 | 751 | { |
863fc849 | 752 | if (!console_sch) |
1da177e4 | 753 | return 0; |
863fc849 | 754 | return schid_equal(&schid, &console_sch->schid); |
1da177e4 LT |
755 | } |
756 | ||
14556b33 | 757 | void cio_register_early_subchannels(void) |
1da177e4 | 758 | { |
14556b33 SO |
759 | int ret; |
760 | ||
761 | if (!console_sch) | |
762 | return; | |
763 | ||
764 | ret = css_register_subchannel(console_sch); | |
765 | if (ret) | |
766 | put_device(&console_sch->dev); | |
1da177e4 | 767 | } |
863fc849 | 768 | #endif /* CONFIG_CCW_CONSOLE */ |
1da177e4 | 769 | |
4d284cac | 770 | static int |
a8237fc4 | 771 | __disable_subchannel_easy(struct subchannel_id schid, struct schib *schib) |
1da177e4 LT |
772 | { |
773 | int retry, cc; | |
774 | ||
775 | cc = 0; | |
776 | for (retry=0;retry<3;retry++) { | |
777 | schib->pmcw.ena = 0; | |
62e65da9 | 778 | cc = msch(schid, schib); |
1da177e4 LT |
779 | if (cc) |
780 | return (cc==3?-ENODEV:-EBUSY); | |
62e65da9 | 781 | if (stsch(schid, schib) || !css_sch_is_valid(schib)) |
cdb912a4 | 782 | return -ENODEV; |
1da177e4 LT |
783 | if (!schib->pmcw.ena) |
784 | return 0; | |
785 | } | |
786 | return -EBUSY; /* uhm... */ | |
787 | } | |
788 | ||
4d284cac | 789 | static int |
0ae7a7b2 | 790 | __clear_io_subchannel_easy(struct subchannel_id schid) |
1da177e4 LT |
791 | { |
792 | int retry; | |
793 | ||
794 | if (csch(schid)) | |
795 | return -ENODEV; | |
796 | for (retry=0;retry<20;retry++) { | |
797 | struct tpi_info ti; | |
798 | ||
799 | if (tpi(&ti)) { | |
0bf7fcf1 | 800 | tsch(ti.schid, this_cpu_ptr(&cio_irb)); |
a8237fc4 | 801 | if (schid_equal(&ti.schid, &schid)) |
4c24da79 | 802 | return 0; |
1da177e4 | 803 | } |
5a0d0e65 | 804 | udelay_simple(100); |
1da177e4 LT |
805 | } |
806 | return -EBUSY; | |
807 | } | |
808 | ||
9d92a7e1 CH |
809 | static void __clear_chsc_subchannel_easy(void) |
810 | { | |
811 | /* It seems we can only wait for a bit here :/ */ | |
5a0d0e65 | 812 | udelay_simple(100); |
9d92a7e1 CH |
813 | } |
814 | ||
a45e1414 MH |
815 | static int pgm_check_occured; |
816 | ||
817 | static void cio_reset_pgm_check_handler(void) | |
818 | { | |
819 | pgm_check_occured = 1; | |
820 | } | |
821 | ||
f9c9fe3e | 822 | static int stsch_reset(struct subchannel_id schid, struct schib *addr) |
a45e1414 MH |
823 | { |
824 | int rc; | |
825 | ||
826 | pgm_check_occured = 0; | |
ab14de6c | 827 | s390_base_pgm_handler_fn = cio_reset_pgm_check_handler; |
62e65da9 | 828 | rc = stsch(schid, addr); |
ab14de6c | 829 | s390_base_pgm_handler_fn = NULL; |
aa77015c | 830 | |
ab14de6c | 831 | /* The program check handler could have changed pgm_check_occured. */ |
6faf4444 | 832 | barrier(); |
aa77015c | 833 | |
a45e1414 MH |
834 | if (pgm_check_occured) |
835 | return -EIO; | |
836 | else | |
837 | return rc; | |
838 | } | |
839 | ||
15e9b586 | 840 | static int __shutdown_subchannel_easy(struct subchannel_id schid, void *data) |
f97a56fb CH |
841 | { |
842 | struct schib schib; | |
843 | ||
a45e1414 | 844 | if (stsch_reset(schid, &schib)) |
f97a56fb CH |
845 | return -ENXIO; |
846 | if (!schib.pmcw.ena) | |
847 | return 0; | |
848 | switch(__disable_subchannel_easy(schid, &schib)) { | |
849 | case 0: | |
850 | case -ENODEV: | |
851 | break; | |
852 | default: /* -EBUSY */ | |
0ae7a7b2 CH |
853 | switch (schib.pmcw.st) { |
854 | case SUBCHANNEL_TYPE_IO: | |
855 | if (__clear_io_subchannel_easy(schid)) | |
856 | goto out; /* give up... */ | |
857 | break; | |
9d92a7e1 CH |
858 | case SUBCHANNEL_TYPE_CHSC: |
859 | __clear_chsc_subchannel_easy(); | |
860 | break; | |
0ae7a7b2 CH |
861 | default: |
862 | /* No default clear strategy */ | |
863 | break; | |
864 | } | |
62e65da9 | 865 | stsch(schid, &schib); |
f97a56fb CH |
866 | __disable_subchannel_easy(schid, &schib); |
867 | } | |
0ae7a7b2 | 868 | out: |
f97a56fb CH |
869 | return 0; |
870 | } | |
1da177e4 | 871 | |
15e9b586 HC |
872 | static atomic_t chpid_reset_count; |
873 | ||
874 | static void s390_reset_chpids_mcck_handler(void) | |
875 | { | |
876 | struct crw crw; | |
dc6e1555 | 877 | union mci mci; |
15e9b586 HC |
878 | |
879 | /* Check for pending channel report word. */ | |
dc6e1555 HC |
880 | mci.val = S390_lowcore.mcck_interruption_code; |
881 | if (!mci.cp) | |
15e9b586 HC |
882 | return; |
883 | /* Process channel report words. */ | |
884 | while (stcrw(&crw) == 0) { | |
885 | /* Check for responses to RCHP. */ | |
886 | if (crw.slct && crw.rsc == CRW_RSC_CPATH) | |
887 | atomic_dec(&chpid_reset_count); | |
888 | } | |
889 | } | |
890 | ||
891 | #define RCHP_TIMEOUT (30 * USEC_PER_SEC) | |
892 | static void css_reset(void) | |
893 | { | |
894 | int i, ret; | |
895 | unsigned long long timeout; | |
f86635fa | 896 | struct chp_id chpid; |
15e9b586 HC |
897 | |
898 | /* Reset subchannels. */ | |
899 | for_each_subchannel(__shutdown_subchannel_easy, NULL); | |
900 | /* Reset channel paths. */ | |
ab14de6c | 901 | s390_base_mcck_handler_fn = s390_reset_chpids_mcck_handler; |
15e9b586 HC |
902 | /* Enable channel report machine checks. */ |
903 | __ctl_set_bit(14, 28); | |
904 | /* Temporarily reenable machine checks. */ | |
905 | local_mcck_enable(); | |
f86635fa | 906 | chp_id_init(&chpid); |
15e9b586 | 907 | for (i = 0; i <= __MAX_CHPID; i++) { |
f86635fa PO |
908 | chpid.id = i; |
909 | ret = rchp(chpid); | |
15e9b586 HC |
910 | if ((ret == 0) || (ret == 2)) |
911 | /* | |
912 | * rchp either succeeded, or another rchp is already | |
913 | * in progress. In either case, we'll get a crw. | |
914 | */ | |
915 | atomic_inc(&chpid_reset_count); | |
916 | } | |
917 | /* Wait for machine check for all channel paths. */ | |
8c071b0f | 918 | timeout = get_tod_clock_fast() + (RCHP_TIMEOUT << 12); |
15e9b586 | 919 | while (atomic_read(&chpid_reset_count) != 0) { |
8c071b0f | 920 | if (get_tod_clock_fast() > timeout) |
15e9b586 HC |
921 | break; |
922 | cpu_relax(); | |
923 | } | |
924 | /* Disable machine checks again. */ | |
925 | local_mcck_disable(); | |
926 | /* Disable channel report machine checks. */ | |
927 | __ctl_clear_bit(14, 28); | |
ab14de6c | 928 | s390_base_mcck_handler_fn = NULL; |
15e9b586 HC |
929 | } |
930 | ||
931 | static struct reset_call css_reset_call = { | |
932 | .fn = css_reset, | |
933 | }; | |
934 | ||
935 | static int __init init_css_reset_call(void) | |
936 | { | |
937 | atomic_set(&chpid_reset_count, 0); | |
938 | register_reset_call(&css_reset_call); | |
939 | return 0; | |
940 | } | |
941 | ||
942 | arch_initcall(init_css_reset_call); | |
943 | ||
944 | struct sch_match_id { | |
945 | struct subchannel_id schid; | |
946 | struct ccw_dev_id devid; | |
947 | int rc; | |
948 | }; | |
949 | ||
950 | static int __reipl_subchannel_match(struct subchannel_id schid, void *data) | |
951 | { | |
952 | struct schib schib; | |
953 | struct sch_match_id *match_id = data; | |
954 | ||
a45e1414 | 955 | if (stsch_reset(schid, &schib)) |
15e9b586 | 956 | return -ENXIO; |
b279a4f5 | 957 | if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv && |
15e9b586 HC |
958 | (schib.pmcw.dev == match_id->devid.devno) && |
959 | (schid.ssid == match_id->devid.ssid)) { | |
960 | match_id->schid = schid; | |
961 | match_id->rc = 0; | |
962 | return 1; | |
963 | } | |
964 | return 0; | |
965 | } | |
966 | ||
967 | static int reipl_find_schid(struct ccw_dev_id *devid, | |
968 | struct subchannel_id *schid) | |
1da177e4 | 969 | { |
ff6b8ea6 MH |
970 | struct sch_match_id match_id; |
971 | ||
972 | match_id.devid = *devid; | |
973 | match_id.rc = -ENODEV; | |
15e9b586 | 974 | for_each_subchannel(__reipl_subchannel_match, &match_id); |
ff6b8ea6 MH |
975 | if (match_id.rc == 0) |
976 | *schid = match_id.schid; | |
977 | return match_id.rc; | |
1da177e4 LT |
978 | } |
979 | ||
ff6b8ea6 MH |
980 | extern void do_reipl_asm(__u32 schid); |
981 | ||
1da177e4 | 982 | /* Make sure all subchannels are quiet before we re-ipl an lpar. */ |
ff6b8ea6 | 983 | void reipl_ccw_dev(struct ccw_dev_id *devid) |
1da177e4 | 984 | { |
41459d36 | 985 | struct subchannel_id uninitialized_var(schid); |
ff6b8ea6 | 986 | |
1a36a39e | 987 | s390_reset_system(); |
15e9b586 | 988 | if (reipl_find_schid(devid, &schid) != 0) |
ff6b8ea6 | 989 | panic("IPL Device not found\n"); |
ff6b8ea6 | 990 | do_reipl_asm(*((__u32*)&schid)); |
1da177e4 | 991 | } |
e87bfe51 | 992 | |
6fc321fd | 993 | int __init cio_get_iplinfo(struct cio_iplinfo *iplinfo) |
e87bfe51 | 994 | { |
18e22a17 | 995 | static struct chsc_sda_area sda_area __initdata; |
e87bfe51 | 996 | struct subchannel_id schid; |
6fc321fd | 997 | struct schib schib; |
e87bfe51 | 998 | |
cbb870c8 | 999 | schid = *(struct subchannel_id *)&S390_lowcore.subchannel_id; |
e87bfe51 | 1000 | if (!schid.one) |
6fc321fd | 1001 | return -ENODEV; |
18e22a17 SO |
1002 | |
1003 | if (schid.ssid) { | |
1004 | /* | |
1005 | * Firmware should have already enabled MSS but whoever started | |
1006 | * the kernel might have initiated a channel subsystem reset. | |
1007 | * Ensure that MSS is enabled. | |
1008 | */ | |
1009 | memset(&sda_area, 0, sizeof(sda_area)); | |
1010 | if (__chsc_enable_facility(&sda_area, CHSC_SDA_OC_MSS)) | |
1011 | return -ENODEV; | |
1012 | } | |
62e65da9 | 1013 | if (stsch(schid, &schib)) |
6fc321fd | 1014 | return -ENODEV; |
b279a4f5 CH |
1015 | if (schib.pmcw.st != SUBCHANNEL_TYPE_IO) |
1016 | return -ENODEV; | |
6fc321fd HC |
1017 | if (!schib.pmcw.dnv) |
1018 | return -ENODEV; | |
18e22a17 SO |
1019 | |
1020 | iplinfo->ssid = schid.ssid; | |
6fc321fd HC |
1021 | iplinfo->devno = schib.pmcw.dev; |
1022 | iplinfo->is_qdio = schib.pmcw.qf; | |
1023 | return 0; | |
e87bfe51 | 1024 | } |
83262d63 PO |
1025 | |
1026 | /** | |
1027 | * cio_tm_start_key - perform start function | |
1028 | * @sch: subchannel on which to perform the start function | |
1029 | * @tcw: transport-command word to be started | |
1030 | * @lpm: mask of paths to use | |
1031 | * @key: storage key to use for storage access | |
1032 | * | |
1033 | * Start the tcw on the given subchannel. Return zero on success, non-zero | |
1034 | * otherwise. | |
1035 | */ | |
1036 | int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key) | |
1037 | { | |
1038 | int cc; | |
1039 | union orb *orb = &to_io_private(sch)->orb; | |
1040 | ||
1041 | memset(orb, 0, sizeof(union orb)); | |
1042 | orb->tm.intparm = (u32) (addr_t) sch; | |
1043 | orb->tm.key = key >> 4; | |
1044 | orb->tm.b = 1; | |
1045 | orb->tm.lpm = lpm ? lpm : sch->lpm; | |
1046 | orb->tm.tcw = (u32) (addr_t) tcw; | |
1047 | cc = ssch(sch->schid, orb); | |
1048 | switch (cc) { | |
1049 | case 0: | |
1050 | return 0; | |
1051 | case 1: | |
1052 | case 2: | |
1053 | return -EBUSY; | |
1054 | default: | |
1055 | return cio_start_handle_notoper(sch, lpm); | |
1056 | } | |
1057 | } | |
a22217e2 | 1058 | EXPORT_SYMBOL_GPL(cio_tm_start_key); |
83262d63 PO |
1059 | |
1060 | /** | |
1061 | * cio_tm_intrg - perform interrogate function | |
1062 | * @sch - subchannel on which to perform the interrogate function | |
1063 | * | |
1064 | * If the specified subchannel is running in transport-mode, perform the | |
1065 | * interrogate function. Return zero on success, non-zero otherwie. | |
1066 | */ | |
1067 | int cio_tm_intrg(struct subchannel *sch) | |
1068 | { | |
1069 | int cc; | |
1070 | ||
1071 | if (!to_io_private(sch)->orb.tm.b) | |
1072 | return -EINVAL; | |
1073 | cc = xsch(sch->schid); | |
1074 | switch (cc) { | |
1075 | case 0: | |
1076 | case 2: | |
1077 | return 0; | |
1078 | case 1: | |
1079 | return -EBUSY; | |
1080 | default: | |
1081 | return -ENODEV; | |
1082 | } | |
1083 | } | |
a22217e2 | 1084 | EXPORT_SYMBOL_GPL(cio_tm_intrg); |