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Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 | 2 | * S/390 common I/O routines -- low level i/o calls |
1da177e4 | 3 | * |
a53c8fab | 4 | * Copyright IBM Corp. 1999, 2008 |
1da177e4 | 5 | * Author(s): Ingo Adlung (adlung@de.ibm.com) |
4ce3b30c | 6 | * Cornelia Huck (cornelia.huck@de.ibm.com) |
1da177e4 LT |
7 | * Arnd Bergmann (arndb@de.ibm.com) |
8 | * Martin Schwidefsky (schwidefsky@de.ibm.com) | |
9 | */ | |
10 | ||
e6d5a428 ME |
11 | #define KMSG_COMPONENT "cio" |
12 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
13 | ||
88dbd203 | 14 | #include <linux/ftrace.h> |
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> | |
257ceab7 | 21 | #include <linux/irq.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> |
bfc3f028 | 32 | #include <linux/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" |
42248979 | 44 | #include "trace.h" |
1da177e4 LT |
45 | |
46 | debug_info_t *cio_debug_msg_id; | |
47 | debug_info_t *cio_debug_trace_id; | |
48 | debug_info_t *cio_debug_crw_id; | |
49 | ||
63aef00b MS |
50 | DEFINE_PER_CPU_ALIGNED(struct irb, cio_irb); |
51 | EXPORT_PER_CPU_SYMBOL(cio_irb); | |
52 | ||
1da177e4 LT |
53 | /* |
54 | * Function: cio_debug_init | |
bc698bcf CH |
55 | * Initializes three debug logs for common I/O: |
56 | * - cio_msg logs generic cio messages | |
1da177e4 | 57 | * - cio_trace logs the calling of different functions |
bc698bcf | 58 | * - cio_crw logs machine check related cio messages |
1da177e4 | 59 | */ |
bc698bcf | 60 | static int __init cio_debug_init(void) |
1da177e4 | 61 | { |
f7e1e65d | 62 | cio_debug_msg_id = debug_register("cio_msg", 16, 1, 11 * sizeof(long)); |
1da177e4 LT |
63 | if (!cio_debug_msg_id) |
64 | goto out_unregister; | |
bc698bcf CH |
65 | debug_register_view(cio_debug_msg_id, &debug_sprintf_view); |
66 | debug_set_level(cio_debug_msg_id, 2); | |
361f494d | 67 | cio_debug_trace_id = debug_register("cio_trace", 16, 1, 16); |
1da177e4 LT |
68 | if (!cio_debug_trace_id) |
69 | goto out_unregister; | |
bc698bcf CH |
70 | debug_register_view(cio_debug_trace_id, &debug_hex_ascii_view); |
71 | debug_set_level(cio_debug_trace_id, 2); | |
f7e1e65d | 72 | cio_debug_crw_id = debug_register("cio_crw", 8, 1, 8 * sizeof(long)); |
1da177e4 LT |
73 | if (!cio_debug_crw_id) |
74 | goto out_unregister; | |
bc698bcf CH |
75 | debug_register_view(cio_debug_crw_id, &debug_sprintf_view); |
76 | debug_set_level(cio_debug_crw_id, 4); | |
1da177e4 LT |
77 | return 0; |
78 | ||
79 | out_unregister: | |
a6e975c5 ME |
80 | debug_unregister(cio_debug_msg_id); |
81 | debug_unregister(cio_debug_trace_id); | |
82 | debug_unregister(cio_debug_crw_id); | |
1da177e4 LT |
83 | return -1; |
84 | } | |
85 | ||
86 | arch_initcall (cio_debug_init); | |
87 | ||
c513d07a | 88 | int cio_set_options(struct subchannel *sch, int flags) |
1da177e4 | 89 | { |
c513d07a | 90 | struct io_subchannel_private *priv = to_io_private(sch); |
1da177e4 | 91 | |
c513d07a SO |
92 | priv->options.suspend = (flags & DOIO_ALLOW_SUSPEND) != 0; |
93 | priv->options.prefetch = (flags & DOIO_DENY_PREFETCH) != 0; | |
94 | priv->options.inter = (flags & DOIO_SUPPRESS_INTER) != 0; | |
95 | return 0; | |
1da177e4 LT |
96 | } |
97 | ||
4d284cac | 98 | static int |
1da177e4 LT |
99 | cio_start_handle_notoper(struct subchannel *sch, __u8 lpm) |
100 | { | |
101 | char dbf_text[15]; | |
102 | ||
103 | if (lpm != 0) | |
104 | sch->lpm &= ~lpm; | |
105 | else | |
106 | sch->lpm = 0; | |
107 | ||
139b83dd | 108 | CIO_MSG_EVENT(2, "cio_start: 'not oper' status for " |
fb6958a5 CH |
109 | "subchannel 0.%x.%04x!\n", sch->schid.ssid, |
110 | sch->schid.sch_no); | |
cdb912a4 SO |
111 | |
112 | if (cio_update_schib(sch)) | |
113 | return -ENODEV; | |
114 | ||
2a0217d5 | 115 | sprintf(dbf_text, "no%s", dev_name(&sch->dev)); |
1da177e4 LT |
116 | CIO_TRACE_EVENT(0, dbf_text); |
117 | CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib)); | |
118 | ||
119 | return (sch->lpm ? -EACCES : -ENODEV); | |
120 | } | |
121 | ||
122 | int | |
123 | cio_start_key (struct subchannel *sch, /* subchannel structure */ | |
124 | struct ccw1 * cpa, /* logical channel prog addr */ | |
125 | __u8 lpm, /* logical path mask */ | |
126 | __u8 key) /* storage key */ | |
127 | { | |
c513d07a SO |
128 | struct io_subchannel_private *priv = to_io_private(sch); |
129 | union orb *orb = &priv->orb; | |
1da177e4 LT |
130 | int ccode; |
131 | ||
efd986db SO |
132 | CIO_TRACE_EVENT(5, "stIO"); |
133 | CIO_TRACE_EVENT(5, dev_name(&sch->dev)); | |
1da177e4 | 134 | |
9adb8c1d | 135 | memset(orb, 0, sizeof(union orb)); |
1da177e4 | 136 | /* sch is always under 2G. */ |
83262d63 PO |
137 | orb->cmd.intparm = (u32)(addr_t)sch; |
138 | orb->cmd.fmt = 1; | |
1da177e4 | 139 | |
c513d07a SO |
140 | orb->cmd.pfch = priv->options.prefetch == 0; |
141 | orb->cmd.spnd = priv->options.suspend; | |
142 | orb->cmd.ssic = priv->options.suspend && priv->options.inter; | |
83262d63 | 143 | orb->cmd.lpm = (lpm != 0) ? lpm : sch->lpm; |
1da177e4 LT |
144 | /* |
145 | * for 64 bit we always support 64 bit IDAWs with 4k page size only | |
146 | */ | |
83262d63 PO |
147 | orb->cmd.c64 = 1; |
148 | orb->cmd.i2k = 0; | |
83262d63 | 149 | orb->cmd.key = key >> 4; |
1da177e4 | 150 | /* issue "Start Subchannel" */ |
83262d63 | 151 | orb->cmd.cpa = (__u32) __pa(cpa); |
cd6b4f27 | 152 | ccode = ssch(sch->schid, orb); |
1da177e4 LT |
153 | |
154 | /* process condition code */ | |
efd986db | 155 | CIO_HEX_EVENT(5, &ccode, sizeof(ccode)); |
1da177e4 LT |
156 | |
157 | switch (ccode) { | |
158 | case 0: | |
159 | /* | |
160 | * initialize device status information | |
161 | */ | |
23d805b6 | 162 | sch->schib.scsw.cmd.actl |= SCSW_ACTL_START_PEND; |
1da177e4 LT |
163 | return 0; |
164 | case 1: /* status pending */ | |
165 | case 2: /* busy */ | |
166 | return -EBUSY; | |
c91ebe49 | 167 | case 3: /* device/path not operational */ |
1da177e4 | 168 | return cio_start_handle_notoper(sch, lpm); |
c91ebe49 CH |
169 | default: |
170 | return ccode; | |
1da177e4 LT |
171 | } |
172 | } | |
173 | ||
174 | int | |
175 | cio_start (struct subchannel *sch, struct ccw1 *cpa, __u8 lpm) | |
176 | { | |
0b642ede | 177 | return cio_start_key(sch, cpa, lpm, PAGE_DEFAULT_KEY); |
1da177e4 LT |
178 | } |
179 | ||
180 | /* | |
181 | * resume suspended I/O operation | |
182 | */ | |
183 | int | |
184 | cio_resume (struct subchannel *sch) | |
185 | { | |
1da177e4 LT |
186 | int ccode; |
187 | ||
efd986db | 188 | CIO_TRACE_EVENT(4, "resIO"); |
2a0217d5 | 189 | CIO_TRACE_EVENT(4, dev_name(&sch->dev)); |
1da177e4 | 190 | |
a8237fc4 | 191 | ccode = rsch (sch->schid); |
1da177e4 | 192 | |
efd986db | 193 | CIO_HEX_EVENT(4, &ccode, sizeof(ccode)); |
1da177e4 LT |
194 | |
195 | switch (ccode) { | |
196 | case 0: | |
23d805b6 | 197 | sch->schib.scsw.cmd.actl |= SCSW_ACTL_RESUME_PEND; |
1da177e4 LT |
198 | return 0; |
199 | case 1: | |
200 | return -EBUSY; | |
201 | case 2: | |
202 | return -EINVAL; | |
203 | default: | |
204 | /* | |
205 | * useless to wait for request completion | |
206 | * as device is no longer operational ! | |
207 | */ | |
208 | return -ENODEV; | |
209 | } | |
210 | } | |
211 | ||
212 | /* | |
213 | * halt I/O operation | |
214 | */ | |
215 | int | |
216 | cio_halt(struct subchannel *sch) | |
217 | { | |
1da177e4 LT |
218 | int ccode; |
219 | ||
220 | if (!sch) | |
221 | return -ENODEV; | |
222 | ||
efd986db | 223 | CIO_TRACE_EVENT(2, "haltIO"); |
2a0217d5 | 224 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 LT |
225 | |
226 | /* | |
227 | * Issue "Halt subchannel" and process condition code | |
228 | */ | |
a8237fc4 | 229 | ccode = hsch (sch->schid); |
1da177e4 | 230 | |
efd986db | 231 | CIO_HEX_EVENT(2, &ccode, sizeof(ccode)); |
1da177e4 LT |
232 | |
233 | switch (ccode) { | |
234 | case 0: | |
23d805b6 | 235 | sch->schib.scsw.cmd.actl |= SCSW_ACTL_HALT_PEND; |
1da177e4 LT |
236 | return 0; |
237 | case 1: /* status pending */ | |
238 | case 2: /* busy */ | |
239 | return -EBUSY; | |
240 | default: /* device not operational */ | |
241 | return -ENODEV; | |
242 | } | |
243 | } | |
244 | ||
245 | /* | |
246 | * Clear I/O operation | |
247 | */ | |
248 | int | |
249 | cio_clear(struct subchannel *sch) | |
250 | { | |
1da177e4 LT |
251 | int ccode; |
252 | ||
253 | if (!sch) | |
254 | return -ENODEV; | |
255 | ||
efd986db | 256 | CIO_TRACE_EVENT(2, "clearIO"); |
2a0217d5 | 257 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 LT |
258 | |
259 | /* | |
260 | * Issue "Clear subchannel" and process condition code | |
261 | */ | |
a8237fc4 | 262 | ccode = csch (sch->schid); |
1da177e4 | 263 | |
efd986db | 264 | CIO_HEX_EVENT(2, &ccode, sizeof(ccode)); |
1da177e4 LT |
265 | |
266 | switch (ccode) { | |
267 | case 0: | |
23d805b6 | 268 | sch->schib.scsw.cmd.actl |= SCSW_ACTL_CLEAR_PEND; |
1da177e4 LT |
269 | return 0; |
270 | default: /* device not operational */ | |
271 | return -ENODEV; | |
272 | } | |
273 | } | |
274 | ||
275 | /* | |
276 | * Function: cio_cancel | |
277 | * Issues a "Cancel Subchannel" on the specified subchannel | |
278 | * Note: We don't need any fancy intparms and flags here | |
279 | * since xsch is executed synchronously. | |
280 | * Only for common I/O internal use as for now. | |
281 | */ | |
282 | int | |
283 | cio_cancel (struct subchannel *sch) | |
284 | { | |
1da177e4 LT |
285 | int ccode; |
286 | ||
287 | if (!sch) | |
288 | return -ENODEV; | |
289 | ||
efd986db | 290 | CIO_TRACE_EVENT(2, "cancelIO"); |
2a0217d5 | 291 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 | 292 | |
a8237fc4 | 293 | ccode = xsch (sch->schid); |
1da177e4 | 294 | |
efd986db | 295 | CIO_HEX_EVENT(2, &ccode, sizeof(ccode)); |
1da177e4 LT |
296 | |
297 | switch (ccode) { | |
298 | case 0: /* success */ | |
299 | /* Update information in scsw. */ | |
cdb912a4 SO |
300 | if (cio_update_schib(sch)) |
301 | return -ENODEV; | |
1da177e4 LT |
302 | return 0; |
303 | case 1: /* status pending */ | |
304 | return -EBUSY; | |
305 | case 2: /* not applicable */ | |
306 | return -EINVAL; | |
307 | default: /* not oper */ | |
308 | return -ENODEV; | |
309 | } | |
310 | } | |
311 | ||
13952ec1 SO |
312 | |
313 | static void cio_apply_config(struct subchannel *sch, struct schib *schib) | |
314 | { | |
315 | schib->pmcw.intparm = sch->config.intparm; | |
316 | schib->pmcw.mbi = sch->config.mbi; | |
317 | schib->pmcw.isc = sch->config.isc; | |
318 | schib->pmcw.ena = sch->config.ena; | |
319 | schib->pmcw.mme = sch->config.mme; | |
320 | schib->pmcw.mp = sch->config.mp; | |
321 | schib->pmcw.csense = sch->config.csense; | |
322 | schib->pmcw.mbfc = sch->config.mbfc; | |
323 | if (sch->config.mbfc) | |
324 | schib->mba = sch->config.mba; | |
325 | } | |
326 | ||
327 | static int cio_check_config(struct subchannel *sch, struct schib *schib) | |
328 | { | |
329 | return (schib->pmcw.intparm == sch->config.intparm) && | |
330 | (schib->pmcw.mbi == sch->config.mbi) && | |
331 | (schib->pmcw.isc == sch->config.isc) && | |
332 | (schib->pmcw.ena == sch->config.ena) && | |
333 | (schib->pmcw.mme == sch->config.mme) && | |
334 | (schib->pmcw.mp == sch->config.mp) && | |
335 | (schib->pmcw.csense == sch->config.csense) && | |
336 | (schib->pmcw.mbfc == sch->config.mbfc) && | |
337 | (!sch->config.mbfc || (schib->mba == sch->config.mba)); | |
338 | } | |
339 | ||
1da177e4 | 340 | /* |
13952ec1 | 341 | * cio_commit_config - apply configuration to the subchannel |
1da177e4 | 342 | */ |
13952ec1 | 343 | int cio_commit_config(struct subchannel *sch) |
1da177e4 | 344 | { |
13952ec1 | 345 | int ccode, retry, ret = 0; |
1bc8927c SO |
346 | struct schib schib; |
347 | struct irb irb; | |
13952ec1 | 348 | |
62e65da9 | 349 | if (stsch(sch->schid, &schib) || !css_sch_is_valid(&schib)) |
13952ec1 | 350 | return -ENODEV; |
1da177e4 | 351 | |
1da177e4 | 352 | for (retry = 0; retry < 5; retry++) { |
13952ec1 SO |
353 | /* copy desired changes to local schib */ |
354 | cio_apply_config(sch, &schib); | |
62e65da9 | 355 | ccode = msch(sch->schid, &schib); |
13952ec1 | 356 | if (ccode < 0) /* -EIO if msch gets a program check. */ |
1da177e4 LT |
357 | return ccode; |
358 | switch (ccode) { | |
73ac36ea | 359 | case 0: /* successful */ |
62e65da9 | 360 | if (stsch(sch->schid, &schib) || |
13952ec1 SO |
361 | !css_sch_is_valid(&schib)) |
362 | return -ENODEV; | |
363 | if (cio_check_config(sch, &schib)) { | |
364 | /* commit changes from local schib */ | |
365 | memcpy(&sch->schib, &schib, sizeof(schib)); | |
366 | return 0; | |
367 | } | |
368 | ret = -EAGAIN; | |
369 | break; | |
370 | case 1: /* status pending */ | |
1bc8927c SO |
371 | ret = -EBUSY; |
372 | if (tsch(sch->schid, &irb)) | |
373 | return ret; | |
374 | break; | |
13952ec1 SO |
375 | case 2: /* busy */ |
376 | udelay(100); /* allow for recovery */ | |
1da177e4 LT |
377 | ret = -EBUSY; |
378 | break; | |
13952ec1 | 379 | case 3: /* not operational */ |
1da177e4 LT |
380 | return -ENODEV; |
381 | } | |
382 | } | |
383 | return ret; | |
384 | } | |
385 | ||
cdb912a4 SO |
386 | /** |
387 | * cio_update_schib - Perform stsch and update schib if subchannel is valid. | |
388 | * @sch: subchannel on which to perform stsch | |
389 | * Return zero on success, -ENODEV otherwise. | |
390 | */ | |
391 | int cio_update_schib(struct subchannel *sch) | |
392 | { | |
393 | struct schib schib; | |
394 | ||
62e65da9 | 395 | if (stsch(sch->schid, &schib) || !css_sch_is_valid(&schib)) |
cdb912a4 SO |
396 | return -ENODEV; |
397 | ||
398 | memcpy(&sch->schib, &schib, sizeof(schib)); | |
399 | return 0; | |
400 | } | |
401 | EXPORT_SYMBOL_GPL(cio_update_schib); | |
402 | ||
44a1c19e CH |
403 | /** |
404 | * cio_enable_subchannel - enable a subchannel. | |
405 | * @sch: subchannel to be enabled | |
406 | * @intparm: interruption parameter to set | |
1da177e4 | 407 | */ |
edf22096 | 408 | int cio_enable_subchannel(struct subchannel *sch, u32 intparm) |
1da177e4 | 409 | { |
1da177e4 LT |
410 | int ret; |
411 | ||
efd986db | 412 | CIO_TRACE_EVENT(2, "ensch"); |
2a0217d5 | 413 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 | 414 | |
d7b5a4c9 CH |
415 | if (sch_is_pseudo_sch(sch)) |
416 | return -EINVAL; | |
cdb912a4 | 417 | if (cio_update_schib(sch)) |
1da177e4 LT |
418 | return -ENODEV; |
419 | ||
13952ec1 SO |
420 | sch->config.ena = 1; |
421 | sch->config.isc = sch->isc; | |
422 | sch->config.intparm = intparm; | |
423 | ||
1bc8927c SO |
424 | ret = cio_commit_config(sch); |
425 | if (ret == -EIO) { | |
426 | /* | |
427 | * Got a program check in msch. Try without | |
428 | * the concurrent sense bit the next time. | |
429 | */ | |
430 | sch->config.csense = 0; | |
13952ec1 | 431 | ret = cio_commit_config(sch); |
1da177e4 | 432 | } |
efd986db | 433 | CIO_HEX_EVENT(2, &ret, sizeof(ret)); |
1da177e4 LT |
434 | return ret; |
435 | } | |
44a1c19e | 436 | EXPORT_SYMBOL_GPL(cio_enable_subchannel); |
1da177e4 | 437 | |
44a1c19e CH |
438 | /** |
439 | * cio_disable_subchannel - disable a subchannel. | |
440 | * @sch: subchannel to disable | |
1da177e4 | 441 | */ |
44a1c19e | 442 | int cio_disable_subchannel(struct subchannel *sch) |
1da177e4 | 443 | { |
1da177e4 LT |
444 | int ret; |
445 | ||
efd986db | 446 | CIO_TRACE_EVENT(2, "dissch"); |
2a0217d5 | 447 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
1da177e4 | 448 | |
d7b5a4c9 CH |
449 | if (sch_is_pseudo_sch(sch)) |
450 | return 0; | |
cdb912a4 | 451 | if (cio_update_schib(sch)) |
1da177e4 LT |
452 | return -ENODEV; |
453 | ||
13952ec1 | 454 | sch->config.ena = 0; |
1bc8927c | 455 | ret = cio_commit_config(sch); |
13952ec1 | 456 | |
efd986db | 457 | CIO_HEX_EVENT(2, &ret, sizeof(ret)); |
1da177e4 LT |
458 | return ret; |
459 | } | |
44a1c19e | 460 | EXPORT_SYMBOL_GPL(cio_disable_subchannel); |
1da177e4 | 461 | |
b3a686f4 | 462 | static int cio_check_devno_blacklisted(struct subchannel *sch) |
0ae7a7b2 | 463 | { |
0ae7a7b2 CH |
464 | if (is_blacklisted(sch->schid.ssid, sch->schib.pmcw.dev)) { |
465 | /* | |
466 | * This device must not be known to Linux. So we simply | |
467 | * say that there is no device and return ENODEV. | |
468 | */ | |
469 | CIO_MSG_EVENT(6, "Blacklisted device detected " | |
470 | "at devno %04X, subchannel set %x\n", | |
471 | sch->schib.pmcw.dev, sch->schid.ssid); | |
472 | return -ENODEV; | |
473 | } | |
474 | return 0; | |
475 | } | |
476 | ||
477 | /** | |
478 | * cio_validate_subchannel - basic validation of subchannel | |
479 | * @sch: subchannel structure to be filled out | |
480 | * @schid: subchannel id | |
1da177e4 LT |
481 | * |
482 | * Find out subchannel type and initialize struct subchannel. | |
483 | * Return codes: | |
0ae7a7b2 | 484 | * 0 on success |
1da177e4 | 485 | * -ENXIO for non-defined subchannels |
0ae7a7b2 CH |
486 | * -ENODEV for invalid subchannels or blacklisted devices |
487 | * -EIO for subchannels in an invalid subchannel set | |
1da177e4 | 488 | */ |
0ae7a7b2 | 489 | int cio_validate_subchannel(struct subchannel *sch, struct subchannel_id schid) |
1da177e4 LT |
490 | { |
491 | char dbf_txt[15]; | |
492 | int ccode; | |
2ec22984 | 493 | int err; |
1da177e4 | 494 | |
0ae7a7b2 CH |
495 | sprintf(dbf_txt, "valsch%x", schid.sch_no); |
496 | CIO_TRACE_EVENT(4, dbf_txt); | |
1da177e4 | 497 | |
1da177e4 LT |
498 | /* |
499 | * The first subchannel that is not-operational (ccode==3) | |
e5dcf002 | 500 | * indicates that there aren't any more devices available. |
fb6958a5 | 501 | * If stsch gets an exception, it means the current subchannel set |
e5dcf002 | 502 | * is not valid. |
1da177e4 | 503 | */ |
62e65da9 | 504 | ccode = stsch(schid, &sch->schib); |
2ec22984 CH |
505 | if (ccode) { |
506 | err = (ccode == 3) ? -ENXIO : ccode; | |
507 | goto out; | |
508 | } | |
1da177e4 | 509 | sch->st = sch->schib.pmcw.st; |
e5dcf002 | 510 | sch->schid = schid; |
c820de39 | 511 | |
0ae7a7b2 CH |
512 | switch (sch->st) { |
513 | case SUBCHANNEL_TYPE_IO: | |
b3a686f4 | 514 | case SUBCHANNEL_TYPE_MSG: |
e510f681 PM |
515 | if (!css_sch_is_valid(&sch->schib)) |
516 | err = -ENODEV; | |
517 | else | |
518 | err = cio_check_devno_blacklisted(sch); | |
b3a686f4 | 519 | break; |
0ae7a7b2 CH |
520 | default: |
521 | err = 0; | |
1da177e4 | 522 | } |
0ae7a7b2 | 523 | if (err) |
808e4888 | 524 | goto out; |
808e4888 | 525 | |
0ae7a7b2 CH |
526 | CIO_MSG_EVENT(4, "Subchannel 0.%x.%04x reports subchannel type %04X\n", |
527 | sch->schid.ssid, sch->schid.sch_no, sch->st); | |
2ec22984 | 528 | out: |
2ec22984 | 529 | return err; |
1da177e4 LT |
530 | } |
531 | ||
532 | /* | |
1f44a225 | 533 | * do_cio_interrupt() handles all normal I/O device IRQ's |
1da177e4 | 534 | */ |
1f44a225 | 535 | static irqreturn_t do_cio_interrupt(int irq, void *dummy) |
1da177e4 | 536 | { |
1f44a225 | 537 | struct tpi_info *tpi_info; |
1da177e4 LT |
538 | struct subchannel *sch; |
539 | struct irb *irb; | |
540 | ||
fe0f4976 | 541 | set_cpu_flag(CIF_NOHZ_DELAY); |
1f44a225 | 542 | tpi_info = (struct tpi_info *) &get_irq_regs()->int_code; |
42248979 | 543 | trace_s390_cio_interrupt(tpi_info); |
0bf7fcf1 | 544 | irb = this_cpu_ptr(&cio_irb); |
48f6b00c MS |
545 | sch = (struct subchannel *)(unsigned long) tpi_info->intparm; |
546 | if (!sch) { | |
547 | /* Clear pending interrupt condition. */ | |
548 | inc_irq_stat(IRQIO_CIO); | |
549 | tsch(tpi_info->schid, irb); | |
1f44a225 | 550 | return IRQ_HANDLED; |
48f6b00c MS |
551 | } |
552 | spin_lock(sch->lock); | |
553 | /* Store interrupt response block to lowcore. */ | |
554 | if (tsch(tpi_info->schid, irb) == 0) { | |
555 | /* Keep subchannel information word up to date. */ | |
556 | memcpy (&sch->schib.scsw, &irb->scsw, sizeof (irb->scsw)); | |
557 | /* Call interrupt handler if there is one. */ | |
558 | if (sch->driver && sch->driver->irq) | |
559 | sch->driver->irq(sch); | |
560 | else | |
420f42ec | 561 | inc_irq_stat(IRQIO_CIO); |
48f6b00c MS |
562 | } else |
563 | inc_irq_stat(IRQIO_CIO); | |
564 | spin_unlock(sch->lock); | |
1f44a225 MS |
565 | |
566 | return IRQ_HANDLED; | |
567 | } | |
568 | ||
1f44a225 MS |
569 | static struct irqaction io_interrupt = { |
570 | .name = "IO", | |
571 | .handler = do_cio_interrupt, | |
572 | }; | |
573 | ||
574 | void __init init_cio_interrupts(void) | |
575 | { | |
576 | irq_set_chip_and_handler(IO_INTERRUPT, | |
577 | &dummy_irq_chip, handle_percpu_irq); | |
578 | setup_irq(IO_INTERRUPT, &io_interrupt); | |
1da177e4 LT |
579 | } |
580 | ||
581 | #ifdef CONFIG_CCW_CONSOLE | |
863fc849 | 582 | static struct subchannel *console_sch; |
dbe33fc9 | 583 | static struct lock_class_key console_sch_key; |
1da177e4 | 584 | |
191fd44c | 585 | /* |
b603d258 | 586 | * Use cio_tsch to update the subchannel status and call the interrupt handler |
188561a4 | 587 | * if status had been pending. Called with the subchannel's lock held. |
191fd44c | 588 | */ |
188561a4 | 589 | void cio_tsch(struct subchannel *sch) |
191fd44c | 590 | { |
191fd44c HC |
591 | struct irb *irb; |
592 | int irq_context; | |
593 | ||
0bf7fcf1 | 594 | irb = this_cpu_ptr(&cio_irb); |
191fd44c | 595 | /* Store interrupt response block to lowcore. */ |
b603d258 | 596 | if (tsch(sch->schid, irb) != 0) |
191fd44c | 597 | /* Not status pending or not operational. */ |
b603d258 MS |
598 | return; |
599 | memcpy(&sch->schib.scsw, &irb->scsw, sizeof(union scsw)); | |
600 | /* Call interrupt handler with updated status. */ | |
191fd44c | 601 | irq_context = in_interrupt(); |
b603d258 | 602 | if (!irq_context) { |
191fd44c | 603 | local_bh_disable(); |
b603d258 MS |
604 | irq_enter(); |
605 | } | |
bc5dfcff | 606 | kstat_incr_irq_this_cpu(IO_INTERRUPT); |
191fd44c HC |
607 | if (sch->driver && sch->driver->irq) |
608 | sch->driver->irq(sch); | |
de400d6b | 609 | else |
420f42ec | 610 | inc_irq_stat(IRQIO_CIO); |
b603d258 MS |
611 | if (!irq_context) { |
612 | irq_exit(); | |
191fd44c | 613 | _local_bh_enable(); |
b603d258 | 614 | } |
191fd44c HC |
615 | } |
616 | ||
863fc849 | 617 | static int cio_test_for_console(struct subchannel_id schid, void *data) |
cd6b4f27 | 618 | { |
863fc849 | 619 | struct schib schib; |
cd6b4f27 | 620 | |
62e65da9 | 621 | if (stsch(schid, &schib) != 0) |
f97a56fb | 622 | return -ENXIO; |
863fc849 SO |
623 | if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv && |
624 | (schib.pmcw.dev == console_devno)) { | |
f97a56fb CH |
625 | console_irq = schid.sch_no; |
626 | return 1; /* found */ | |
627 | } | |
628 | return 0; | |
629 | } | |
630 | ||
863fc849 | 631 | static int cio_get_console_sch_no(void) |
1da177e4 | 632 | { |
a8237fc4 | 633 | struct subchannel_id schid; |
863fc849 SO |
634 | struct schib schib; |
635 | ||
a8237fc4 | 636 | init_subchannel_id(&schid); |
1da177e4 LT |
637 | if (console_irq != -1) { |
638 | /* VM provided us with the irq number of the console. */ | |
a8237fc4 | 639 | schid.sch_no = console_irq; |
62e65da9 | 640 | if (stsch(schid, &schib) != 0 || |
863fc849 | 641 | (schib.pmcw.st != SUBCHANNEL_TYPE_IO) || !schib.pmcw.dnv) |
1da177e4 | 642 | return -1; |
863fc849 | 643 | console_devno = schib.pmcw.dev; |
1da177e4 LT |
644 | } else if (console_devno != -1) { |
645 | /* At least the console device number is known. */ | |
f97a56fb | 646 | for_each_subchannel(cio_test_for_console, NULL); |
1da177e4 LT |
647 | } |
648 | return console_irq; | |
649 | } | |
650 | ||
863fc849 | 651 | struct subchannel *cio_probe_console(void) |
1da177e4 | 652 | { |
a8237fc4 | 653 | struct subchannel_id schid; |
863fc849 SO |
654 | struct subchannel *sch; |
655 | int sch_no, ret; | |
1da177e4 | 656 | |
f97a56fb CH |
657 | sch_no = cio_get_console_sch_no(); |
658 | if (sch_no == -1) { | |
baebc70a | 659 | pr_warn("No CCW console was found\n"); |
1da177e4 LT |
660 | return ERR_PTR(-ENODEV); |
661 | } | |
a8237fc4 | 662 | init_subchannel_id(&schid); |
f97a56fb | 663 | schid.sch_no = sch_no; |
863fc849 SO |
664 | sch = css_alloc_subchannel(schid); |
665 | if (IS_ERR(sch)) | |
666 | return sch; | |
1da177e4 | 667 | |
dbe33fc9 | 668 | lockdep_set_class(sch->lock, &console_sch_key); |
6ef556cc | 669 | isc_register(CONSOLE_ISC); |
863fc849 SO |
670 | sch->config.isc = CONSOLE_ISC; |
671 | sch->config.intparm = (u32)(addr_t)sch; | |
672 | ret = cio_commit_config(sch); | |
1da177e4 | 673 | if (ret) { |
6ef556cc | 674 | isc_unregister(CONSOLE_ISC); |
863fc849 | 675 | put_device(&sch->dev); |
1da177e4 LT |
676 | return ERR_PTR(ret); |
677 | } | |
863fc849 SO |
678 | console_sch = sch; |
679 | return sch; | |
1da177e4 LT |
680 | } |
681 | ||
863fc849 | 682 | int cio_is_console(struct subchannel_id schid) |
1da177e4 | 683 | { |
863fc849 | 684 | if (!console_sch) |
1da177e4 | 685 | return 0; |
863fc849 | 686 | return schid_equal(&schid, &console_sch->schid); |
1da177e4 LT |
687 | } |
688 | ||
14556b33 | 689 | void cio_register_early_subchannels(void) |
1da177e4 | 690 | { |
14556b33 SO |
691 | int ret; |
692 | ||
693 | if (!console_sch) | |
694 | return; | |
695 | ||
696 | ret = css_register_subchannel(console_sch); | |
697 | if (ret) | |
698 | put_device(&console_sch->dev); | |
1da177e4 | 699 | } |
863fc849 | 700 | #endif /* CONFIG_CCW_CONSOLE */ |
1da177e4 | 701 | |
4d284cac | 702 | static int |
a8237fc4 | 703 | __disable_subchannel_easy(struct subchannel_id schid, struct schib *schib) |
1da177e4 LT |
704 | { |
705 | int retry, cc; | |
706 | ||
707 | cc = 0; | |
708 | for (retry=0;retry<3;retry++) { | |
709 | schib->pmcw.ena = 0; | |
62e65da9 | 710 | cc = msch(schid, schib); |
1da177e4 LT |
711 | if (cc) |
712 | return (cc==3?-ENODEV:-EBUSY); | |
62e65da9 | 713 | if (stsch(schid, schib) || !css_sch_is_valid(schib)) |
cdb912a4 | 714 | return -ENODEV; |
1da177e4 LT |
715 | if (!schib->pmcw.ena) |
716 | return 0; | |
717 | } | |
718 | return -EBUSY; /* uhm... */ | |
719 | } | |
720 | ||
4d284cac | 721 | static int |
0ae7a7b2 | 722 | __clear_io_subchannel_easy(struct subchannel_id schid) |
1da177e4 LT |
723 | { |
724 | int retry; | |
725 | ||
726 | if (csch(schid)) | |
727 | return -ENODEV; | |
728 | for (retry=0;retry<20;retry++) { | |
729 | struct tpi_info ti; | |
730 | ||
731 | if (tpi(&ti)) { | |
0bf7fcf1 | 732 | tsch(ti.schid, this_cpu_ptr(&cio_irb)); |
a8237fc4 | 733 | if (schid_equal(&ti.schid, &schid)) |
4c24da79 | 734 | return 0; |
1da177e4 | 735 | } |
5a0d0e65 | 736 | udelay_simple(100); |
1da177e4 LT |
737 | } |
738 | return -EBUSY; | |
739 | } | |
740 | ||
9d92a7e1 CH |
741 | static void __clear_chsc_subchannel_easy(void) |
742 | { | |
743 | /* It seems we can only wait for a bit here :/ */ | |
5a0d0e65 | 744 | udelay_simple(100); |
9d92a7e1 CH |
745 | } |
746 | ||
a45e1414 MH |
747 | static int pgm_check_occured; |
748 | ||
749 | static void cio_reset_pgm_check_handler(void) | |
750 | { | |
751 | pgm_check_occured = 1; | |
752 | } | |
753 | ||
f9c9fe3e | 754 | static int stsch_reset(struct subchannel_id schid, struct schib *addr) |
a45e1414 MH |
755 | { |
756 | int rc; | |
757 | ||
758 | pgm_check_occured = 0; | |
ab14de6c | 759 | s390_base_pgm_handler_fn = cio_reset_pgm_check_handler; |
62e65da9 | 760 | rc = stsch(schid, addr); |
ab14de6c | 761 | s390_base_pgm_handler_fn = NULL; |
aa77015c | 762 | |
ab14de6c | 763 | /* The program check handler could have changed pgm_check_occured. */ |
6faf4444 | 764 | barrier(); |
aa77015c | 765 | |
a45e1414 MH |
766 | if (pgm_check_occured) |
767 | return -EIO; | |
768 | else | |
769 | return rc; | |
770 | } | |
771 | ||
15e9b586 | 772 | static int __shutdown_subchannel_easy(struct subchannel_id schid, void *data) |
f97a56fb CH |
773 | { |
774 | struct schib schib; | |
775 | ||
a45e1414 | 776 | if (stsch_reset(schid, &schib)) |
f97a56fb CH |
777 | return -ENXIO; |
778 | if (!schib.pmcw.ena) | |
779 | return 0; | |
780 | switch(__disable_subchannel_easy(schid, &schib)) { | |
781 | case 0: | |
782 | case -ENODEV: | |
783 | break; | |
784 | default: /* -EBUSY */ | |
0ae7a7b2 CH |
785 | switch (schib.pmcw.st) { |
786 | case SUBCHANNEL_TYPE_IO: | |
787 | if (__clear_io_subchannel_easy(schid)) | |
788 | goto out; /* give up... */ | |
789 | break; | |
9d92a7e1 CH |
790 | case SUBCHANNEL_TYPE_CHSC: |
791 | __clear_chsc_subchannel_easy(); | |
792 | break; | |
0ae7a7b2 CH |
793 | default: |
794 | /* No default clear strategy */ | |
795 | break; | |
796 | } | |
62e65da9 | 797 | stsch(schid, &schib); |
f97a56fb CH |
798 | __disable_subchannel_easy(schid, &schib); |
799 | } | |
0ae7a7b2 | 800 | out: |
f97a56fb CH |
801 | return 0; |
802 | } | |
1da177e4 | 803 | |
15e9b586 HC |
804 | static atomic_t chpid_reset_count; |
805 | ||
806 | static void s390_reset_chpids_mcck_handler(void) | |
807 | { | |
808 | struct crw crw; | |
dc6e1555 | 809 | union mci mci; |
15e9b586 HC |
810 | |
811 | /* Check for pending channel report word. */ | |
dc6e1555 HC |
812 | mci.val = S390_lowcore.mcck_interruption_code; |
813 | if (!mci.cp) | |
15e9b586 HC |
814 | return; |
815 | /* Process channel report words. */ | |
816 | while (stcrw(&crw) == 0) { | |
817 | /* Check for responses to RCHP. */ | |
818 | if (crw.slct && crw.rsc == CRW_RSC_CPATH) | |
819 | atomic_dec(&chpid_reset_count); | |
820 | } | |
821 | } | |
822 | ||
823 | #define RCHP_TIMEOUT (30 * USEC_PER_SEC) | |
824 | static void css_reset(void) | |
825 | { | |
826 | int i, ret; | |
827 | unsigned long long timeout; | |
f86635fa | 828 | struct chp_id chpid; |
15e9b586 HC |
829 | |
830 | /* Reset subchannels. */ | |
831 | for_each_subchannel(__shutdown_subchannel_easy, NULL); | |
832 | /* Reset channel paths. */ | |
ab14de6c | 833 | s390_base_mcck_handler_fn = s390_reset_chpids_mcck_handler; |
15e9b586 HC |
834 | /* Enable channel report machine checks. */ |
835 | __ctl_set_bit(14, 28); | |
836 | /* Temporarily reenable machine checks. */ | |
837 | local_mcck_enable(); | |
f86635fa | 838 | chp_id_init(&chpid); |
15e9b586 | 839 | for (i = 0; i <= __MAX_CHPID; i++) { |
f86635fa PO |
840 | chpid.id = i; |
841 | ret = rchp(chpid); | |
15e9b586 HC |
842 | if ((ret == 0) || (ret == 2)) |
843 | /* | |
844 | * rchp either succeeded, or another rchp is already | |
845 | * in progress. In either case, we'll get a crw. | |
846 | */ | |
847 | atomic_inc(&chpid_reset_count); | |
848 | } | |
849 | /* Wait for machine check for all channel paths. */ | |
8c071b0f | 850 | timeout = get_tod_clock_fast() + (RCHP_TIMEOUT << 12); |
15e9b586 | 851 | while (atomic_read(&chpid_reset_count) != 0) { |
8c071b0f | 852 | if (get_tod_clock_fast() > timeout) |
15e9b586 HC |
853 | break; |
854 | cpu_relax(); | |
855 | } | |
856 | /* Disable machine checks again. */ | |
857 | local_mcck_disable(); | |
858 | /* Disable channel report machine checks. */ | |
859 | __ctl_clear_bit(14, 28); | |
ab14de6c | 860 | s390_base_mcck_handler_fn = NULL; |
15e9b586 HC |
861 | } |
862 | ||
863 | static struct reset_call css_reset_call = { | |
864 | .fn = css_reset, | |
865 | }; | |
866 | ||
867 | static int __init init_css_reset_call(void) | |
868 | { | |
869 | atomic_set(&chpid_reset_count, 0); | |
870 | register_reset_call(&css_reset_call); | |
871 | return 0; | |
872 | } | |
873 | ||
874 | arch_initcall(init_css_reset_call); | |
875 | ||
876 | struct sch_match_id { | |
877 | struct subchannel_id schid; | |
878 | struct ccw_dev_id devid; | |
879 | int rc; | |
880 | }; | |
881 | ||
882 | static int __reipl_subchannel_match(struct subchannel_id schid, void *data) | |
883 | { | |
884 | struct schib schib; | |
885 | struct sch_match_id *match_id = data; | |
886 | ||
a45e1414 | 887 | if (stsch_reset(schid, &schib)) |
15e9b586 | 888 | return -ENXIO; |
b279a4f5 | 889 | if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv && |
15e9b586 HC |
890 | (schib.pmcw.dev == match_id->devid.devno) && |
891 | (schid.ssid == match_id->devid.ssid)) { | |
892 | match_id->schid = schid; | |
893 | match_id->rc = 0; | |
894 | return 1; | |
895 | } | |
896 | return 0; | |
897 | } | |
898 | ||
899 | static int reipl_find_schid(struct ccw_dev_id *devid, | |
900 | struct subchannel_id *schid) | |
1da177e4 | 901 | { |
ff6b8ea6 MH |
902 | struct sch_match_id match_id; |
903 | ||
904 | match_id.devid = *devid; | |
905 | match_id.rc = -ENODEV; | |
15e9b586 | 906 | for_each_subchannel(__reipl_subchannel_match, &match_id); |
ff6b8ea6 MH |
907 | if (match_id.rc == 0) |
908 | *schid = match_id.schid; | |
909 | return match_id.rc; | |
1da177e4 LT |
910 | } |
911 | ||
ff6b8ea6 MH |
912 | extern void do_reipl_asm(__u32 schid); |
913 | ||
1da177e4 | 914 | /* Make sure all subchannels are quiet before we re-ipl an lpar. */ |
ff6b8ea6 | 915 | void reipl_ccw_dev(struct ccw_dev_id *devid) |
1da177e4 | 916 | { |
41459d36 | 917 | struct subchannel_id uninitialized_var(schid); |
ff6b8ea6 | 918 | |
1a36a39e | 919 | s390_reset_system(); |
15e9b586 | 920 | if (reipl_find_schid(devid, &schid) != 0) |
ff6b8ea6 | 921 | panic("IPL Device not found\n"); |
ff6b8ea6 | 922 | do_reipl_asm(*((__u32*)&schid)); |
1da177e4 | 923 | } |
e87bfe51 | 924 | |
6fc321fd | 925 | int __init cio_get_iplinfo(struct cio_iplinfo *iplinfo) |
e87bfe51 | 926 | { |
18e22a17 | 927 | static struct chsc_sda_area sda_area __initdata; |
e87bfe51 | 928 | struct subchannel_id schid; |
6fc321fd | 929 | struct schib schib; |
e87bfe51 | 930 | |
cbb870c8 | 931 | schid = *(struct subchannel_id *)&S390_lowcore.subchannel_id; |
e87bfe51 | 932 | if (!schid.one) |
6fc321fd | 933 | return -ENODEV; |
18e22a17 SO |
934 | |
935 | if (schid.ssid) { | |
936 | /* | |
937 | * Firmware should have already enabled MSS but whoever started | |
938 | * the kernel might have initiated a channel subsystem reset. | |
939 | * Ensure that MSS is enabled. | |
940 | */ | |
941 | memset(&sda_area, 0, sizeof(sda_area)); | |
942 | if (__chsc_enable_facility(&sda_area, CHSC_SDA_OC_MSS)) | |
943 | return -ENODEV; | |
944 | } | |
62e65da9 | 945 | if (stsch(schid, &schib)) |
6fc321fd | 946 | return -ENODEV; |
b279a4f5 CH |
947 | if (schib.pmcw.st != SUBCHANNEL_TYPE_IO) |
948 | return -ENODEV; | |
6fc321fd HC |
949 | if (!schib.pmcw.dnv) |
950 | return -ENODEV; | |
18e22a17 SO |
951 | |
952 | iplinfo->ssid = schid.ssid; | |
6fc321fd HC |
953 | iplinfo->devno = schib.pmcw.dev; |
954 | iplinfo->is_qdio = schib.pmcw.qf; | |
955 | return 0; | |
e87bfe51 | 956 | } |
83262d63 PO |
957 | |
958 | /** | |
959 | * cio_tm_start_key - perform start function | |
960 | * @sch: subchannel on which to perform the start function | |
961 | * @tcw: transport-command word to be started | |
962 | * @lpm: mask of paths to use | |
963 | * @key: storage key to use for storage access | |
964 | * | |
965 | * Start the tcw on the given subchannel. Return zero on success, non-zero | |
966 | * otherwise. | |
967 | */ | |
968 | int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key) | |
969 | { | |
970 | int cc; | |
971 | union orb *orb = &to_io_private(sch)->orb; | |
972 | ||
973 | memset(orb, 0, sizeof(union orb)); | |
974 | orb->tm.intparm = (u32) (addr_t) sch; | |
975 | orb->tm.key = key >> 4; | |
976 | orb->tm.b = 1; | |
977 | orb->tm.lpm = lpm ? lpm : sch->lpm; | |
978 | orb->tm.tcw = (u32) (addr_t) tcw; | |
979 | cc = ssch(sch->schid, orb); | |
980 | switch (cc) { | |
981 | case 0: | |
982 | return 0; | |
983 | case 1: | |
984 | case 2: | |
985 | return -EBUSY; | |
986 | default: | |
987 | return cio_start_handle_notoper(sch, lpm); | |
988 | } | |
989 | } | |
990 | ||
991 | /** | |
992 | * cio_tm_intrg - perform interrogate function | |
993 | * @sch - subchannel on which to perform the interrogate function | |
994 | * | |
995 | * If the specified subchannel is running in transport-mode, perform the | |
996 | * interrogate function. Return zero on success, non-zero otherwie. | |
997 | */ | |
998 | int cio_tm_intrg(struct subchannel *sch) | |
999 | { | |
1000 | int cc; | |
1001 | ||
1002 | if (!to_io_private(sch)->orb.tm.b) | |
1003 | return -EINVAL; | |
1004 | cc = xsch(sch->schid); | |
1005 | switch (cc) { | |
1006 | case 0: | |
1007 | case 2: | |
1008 | return 0; | |
1009 | case 1: | |
1010 | return -EBUSY; | |
1011 | default: | |
1012 | return -ENODEV; | |
1013 | } | |
1014 | } |