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> | |
1da177e4 LT |
21 | #include <asm/cio.h> |
22 | #include <asm/delay.h> | |
23 | #include <asm/irq.h> | |
5a489b98 | 24 | #include <asm/irq_regs.h> |
e87bfe51 | 25 | #include <asm/setup.h> |
15e9b586 | 26 | #include <asm/reset.h> |
46b05d26 | 27 | #include <asm/ipl.h> |
e5854a58 | 28 | #include <asm/chpid.h> |
4e8e56c6 | 29 | #include <asm/airq.h> |
3a3fc29a | 30 | #include <asm/isc.h> |
76d4e00a | 31 | #include <asm/cputime.h> |
83262d63 | 32 | #include <asm/fcx.h> |
f5daba1d HC |
33 | #include <asm/nmi.h> |
34 | #include <asm/crw.h> | |
1da177e4 LT |
35 | #include "cio.h" |
36 | #include "css.h" | |
37 | #include "chsc.h" | |
38 | #include "ioasm.h" | |
cd6b4f27 | 39 | #include "io_sch.h" |
1da177e4 LT |
40 | #include "blacklist.h" |
41 | #include "cio_debug.h" | |
e6b6e10a | 42 | #include "chp.h" |
1da177e4 LT |
43 | |
44 | debug_info_t *cio_debug_msg_id; | |
45 | debug_info_t *cio_debug_trace_id; | |
46 | debug_info_t *cio_debug_crw_id; | |
47 | ||
1da177e4 LT |
48 | /* |
49 | * Function: cio_debug_init | |
bc698bcf CH |
50 | * Initializes three debug logs for common I/O: |
51 | * - cio_msg logs generic cio messages | |
1da177e4 | 52 | * - cio_trace logs the calling of different functions |
bc698bcf | 53 | * - cio_crw logs machine check related cio messages |
1da177e4 | 54 | */ |
bc698bcf | 55 | static int __init cio_debug_init(void) |
1da177e4 | 56 | { |
361f494d | 57 | cio_debug_msg_id = debug_register("cio_msg", 16, 1, 16 * sizeof(long)); |
1da177e4 LT |
58 | if (!cio_debug_msg_id) |
59 | goto out_unregister; | |
bc698bcf CH |
60 | debug_register_view(cio_debug_msg_id, &debug_sprintf_view); |
61 | debug_set_level(cio_debug_msg_id, 2); | |
361f494d | 62 | cio_debug_trace_id = debug_register("cio_trace", 16, 1, 16); |
1da177e4 LT |
63 | if (!cio_debug_trace_id) |
64 | goto out_unregister; | |
bc698bcf CH |
65 | debug_register_view(cio_debug_trace_id, &debug_hex_ascii_view); |
66 | debug_set_level(cio_debug_trace_id, 2); | |
361f494d | 67 | cio_debug_crw_id = debug_register("cio_crw", 16, 1, 16 * sizeof(long)); |
1da177e4 LT |
68 | if (!cio_debug_crw_id) |
69 | goto out_unregister; | |
bc698bcf CH |
70 | debug_register_view(cio_debug_crw_id, &debug_sprintf_view); |
71 | debug_set_level(cio_debug_crw_id, 4); | |
1da177e4 LT |
72 | return 0; |
73 | ||
74 | out_unregister: | |
75 | if (cio_debug_msg_id) | |
bc698bcf | 76 | debug_unregister(cio_debug_msg_id); |
1da177e4 | 77 | if (cio_debug_trace_id) |
bc698bcf | 78 | debug_unregister(cio_debug_trace_id); |
1da177e4 | 79 | if (cio_debug_crw_id) |
bc698bcf | 80 | debug_unregister(cio_debug_crw_id); |
1da177e4 LT |
81 | return -1; |
82 | } | |
83 | ||
84 | arch_initcall (cio_debug_init); | |
85 | ||
c513d07a | 86 | int cio_set_options(struct subchannel *sch, int flags) |
1da177e4 | 87 | { |
c513d07a | 88 | struct io_subchannel_private *priv = to_io_private(sch); |
1da177e4 | 89 | |
c513d07a SO |
90 | priv->options.suspend = (flags & DOIO_ALLOW_SUSPEND) != 0; |
91 | priv->options.prefetch = (flags & DOIO_DENY_PREFETCH) != 0; | |
92 | priv->options.inter = (flags & DOIO_SUPPRESS_INTER) != 0; | |
93 | return 0; | |
1da177e4 LT |
94 | } |
95 | ||
4d284cac | 96 | static int |
1da177e4 LT |
97 | cio_start_handle_notoper(struct subchannel *sch, __u8 lpm) |
98 | { | |
99 | char dbf_text[15]; | |
100 | ||
101 | if (lpm != 0) | |
102 | sch->lpm &= ~lpm; | |
103 | else | |
104 | sch->lpm = 0; | |
105 | ||
139b83dd | 106 | CIO_MSG_EVENT(2, "cio_start: 'not oper' status for " |
fb6958a5 CH |
107 | "subchannel 0.%x.%04x!\n", sch->schid.ssid, |
108 | sch->schid.sch_no); | |
cdb912a4 SO |
109 | |
110 | if (cio_update_schib(sch)) | |
111 | return -ENODEV; | |
112 | ||
2a0217d5 | 113 | sprintf(dbf_text, "no%s", dev_name(&sch->dev)); |
1da177e4 LT |
114 | CIO_TRACE_EVENT(0, dbf_text); |
115 | CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib)); | |
116 | ||
117 | return (sch->lpm ? -EACCES : -ENODEV); | |
118 | } | |
119 | ||
120 | int | |
121 | cio_start_key (struct subchannel *sch, /* subchannel structure */ | |
122 | struct ccw1 * cpa, /* logical channel prog addr */ | |
123 | __u8 lpm, /* logical path mask */ | |
124 | __u8 key) /* storage key */ | |
125 | { | |
c513d07a SO |
126 | struct io_subchannel_private *priv = to_io_private(sch); |
127 | union orb *orb = &priv->orb; | |
1da177e4 LT |
128 | int ccode; |
129 | ||
efd986db SO |
130 | CIO_TRACE_EVENT(5, "stIO"); |
131 | CIO_TRACE_EVENT(5, dev_name(&sch->dev)); | |
1da177e4 | 132 | |
9adb8c1d | 133 | memset(orb, 0, sizeof(union orb)); |
1da177e4 | 134 | /* sch is always under 2G. */ |
83262d63 PO |
135 | orb->cmd.intparm = (u32)(addr_t)sch; |
136 | orb->cmd.fmt = 1; | |
1da177e4 | 137 | |
c513d07a SO |
138 | orb->cmd.pfch = priv->options.prefetch == 0; |
139 | orb->cmd.spnd = priv->options.suspend; | |
140 | orb->cmd.ssic = priv->options.suspend && priv->options.inter; | |
83262d63 | 141 | orb->cmd.lpm = (lpm != 0) ? lpm : sch->lpm; |
347a8dc3 | 142 | #ifdef CONFIG_64BIT |
1da177e4 LT |
143 | /* |
144 | * for 64 bit we always support 64 bit IDAWs with 4k page size only | |
145 | */ | |
83262d63 PO |
146 | orb->cmd.c64 = 1; |
147 | orb->cmd.i2k = 0; | |
1da177e4 | 148 | #endif |
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 | |
8821d24c | 349 | if (stsch_err(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); | |
355 | ccode = msch_err(sch->schid, &schib); | |
356 | if (ccode < 0) /* -EIO if msch gets a program check. */ | |
1da177e4 LT |
357 | return ccode; |
358 | switch (ccode) { | |
73ac36ea | 359 | case 0: /* successful */ |
8821d24c | 360 | if (stsch_err(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 | ||
8821d24c | 395 | if (stsch_err(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 | ||
b3a686f4 CH |
477 | static int cio_validate_io_subchannel(struct subchannel *sch) |
478 | { | |
479 | /* Initialization for io subchannels. */ | |
480 | if (!css_sch_is_valid(&sch->schib)) | |
481 | return -ENODEV; | |
482 | ||
483 | /* Devno is valid. */ | |
484 | return cio_check_devno_blacklisted(sch); | |
485 | } | |
486 | ||
487 | static int cio_validate_msg_subchannel(struct subchannel *sch) | |
488 | { | |
489 | /* Initialization for message subchannels. */ | |
490 | if (!css_sch_is_valid(&sch->schib)) | |
491 | return -ENODEV; | |
492 | ||
493 | /* Devno is valid. */ | |
494 | return cio_check_devno_blacklisted(sch); | |
495 | } | |
496 | ||
0ae7a7b2 CH |
497 | /** |
498 | * cio_validate_subchannel - basic validation of subchannel | |
499 | * @sch: subchannel structure to be filled out | |
500 | * @schid: subchannel id | |
1da177e4 LT |
501 | * |
502 | * Find out subchannel type and initialize struct subchannel. | |
503 | * Return codes: | |
0ae7a7b2 | 504 | * 0 on success |
1da177e4 | 505 | * -ENXIO for non-defined subchannels |
0ae7a7b2 CH |
506 | * -ENODEV for invalid subchannels or blacklisted devices |
507 | * -EIO for subchannels in an invalid subchannel set | |
1da177e4 | 508 | */ |
0ae7a7b2 | 509 | int cio_validate_subchannel(struct subchannel *sch, struct subchannel_id schid) |
1da177e4 LT |
510 | { |
511 | char dbf_txt[15]; | |
512 | int ccode; | |
2ec22984 | 513 | int err; |
1da177e4 | 514 | |
0ae7a7b2 CH |
515 | sprintf(dbf_txt, "valsch%x", schid.sch_no); |
516 | CIO_TRACE_EVENT(4, dbf_txt); | |
1da177e4 | 517 | |
1da177e4 LT |
518 | /* |
519 | * The first subchannel that is not-operational (ccode==3) | |
e5dcf002 | 520 | * indicates that there aren't any more devices available. |
fb6958a5 | 521 | * If stsch gets an exception, it means the current subchannel set |
e5dcf002 | 522 | * is not valid. |
1da177e4 | 523 | */ |
e5dcf002 | 524 | ccode = stsch_err(schid, &sch->schib); |
2ec22984 CH |
525 | if (ccode) { |
526 | err = (ccode == 3) ? -ENXIO : ccode; | |
527 | goto out; | |
528 | } | |
1da177e4 | 529 | sch->st = sch->schib.pmcw.st; |
e5dcf002 | 530 | sch->schid = schid; |
c820de39 | 531 | |
0ae7a7b2 CH |
532 | switch (sch->st) { |
533 | case SUBCHANNEL_TYPE_IO: | |
534 | err = cio_validate_io_subchannel(sch); | |
535 | break; | |
b3a686f4 CH |
536 | case SUBCHANNEL_TYPE_MSG: |
537 | err = cio_validate_msg_subchannel(sch); | |
538 | break; | |
0ae7a7b2 CH |
539 | default: |
540 | err = 0; | |
1da177e4 | 541 | } |
0ae7a7b2 | 542 | if (err) |
808e4888 | 543 | goto out; |
808e4888 | 544 | |
0ae7a7b2 CH |
545 | CIO_MSG_EVENT(4, "Subchannel 0.%x.%04x reports subchannel type %04X\n", |
546 | sch->schid.ssid, sch->schid.sch_no, sch->st); | |
2ec22984 | 547 | out: |
2ec22984 | 548 | return err; |
1da177e4 LT |
549 | } |
550 | ||
551 | /* | |
1f44a225 | 552 | * do_cio_interrupt() handles all normal I/O device IRQ's |
1da177e4 | 553 | */ |
1f44a225 | 554 | static irqreturn_t do_cio_interrupt(int irq, void *dummy) |
1da177e4 | 555 | { |
1f44a225 | 556 | struct tpi_info *tpi_info; |
1da177e4 LT |
557 | struct subchannel *sch; |
558 | struct irb *irb; | |
559 | ||
4a6f4fe8 | 560 | __this_cpu_write(s390_idle.nohz_delay, 1); |
1f44a225 | 561 | tpi_info = (struct tpi_info *) &get_irq_regs()->int_code; |
48f6b00c | 562 | irb = (struct irb *) &S390_lowcore.irb; |
48f6b00c MS |
563 | sch = (struct subchannel *)(unsigned long) tpi_info->intparm; |
564 | if (!sch) { | |
565 | /* Clear pending interrupt condition. */ | |
566 | inc_irq_stat(IRQIO_CIO); | |
567 | tsch(tpi_info->schid, irb); | |
1f44a225 | 568 | return IRQ_HANDLED; |
48f6b00c MS |
569 | } |
570 | spin_lock(sch->lock); | |
571 | /* Store interrupt response block to lowcore. */ | |
572 | if (tsch(tpi_info->schid, irb) == 0) { | |
573 | /* Keep subchannel information word up to date. */ | |
574 | memcpy (&sch->schib.scsw, &irb->scsw, sizeof (irb->scsw)); | |
575 | /* Call interrupt handler if there is one. */ | |
576 | if (sch->driver && sch->driver->irq) | |
577 | sch->driver->irq(sch); | |
578 | else | |
420f42ec | 579 | inc_irq_stat(IRQIO_CIO); |
48f6b00c MS |
580 | } else |
581 | inc_irq_stat(IRQIO_CIO); | |
582 | spin_unlock(sch->lock); | |
1f44a225 MS |
583 | |
584 | return IRQ_HANDLED; | |
585 | } | |
586 | ||
587 | static struct irq_desc *irq_desc_io; | |
588 | ||
589 | static struct irqaction io_interrupt = { | |
590 | .name = "IO", | |
591 | .handler = do_cio_interrupt, | |
592 | }; | |
593 | ||
594 | void __init init_cio_interrupts(void) | |
595 | { | |
596 | irq_set_chip_and_handler(IO_INTERRUPT, | |
597 | &dummy_irq_chip, handle_percpu_irq); | |
598 | setup_irq(IO_INTERRUPT, &io_interrupt); | |
599 | irq_desc_io = irq_to_desc(IO_INTERRUPT); | |
1da177e4 LT |
600 | } |
601 | ||
602 | #ifdef CONFIG_CCW_CONSOLE | |
863fc849 | 603 | static struct subchannel *console_sch; |
1da177e4 | 604 | |
191fd44c | 605 | /* |
b603d258 | 606 | * Use cio_tsch to update the subchannel status and call the interrupt handler |
188561a4 | 607 | * if status had been pending. Called with the subchannel's lock held. |
191fd44c | 608 | */ |
188561a4 | 609 | void cio_tsch(struct subchannel *sch) |
191fd44c | 610 | { |
191fd44c HC |
611 | struct irb *irb; |
612 | int irq_context; | |
613 | ||
cbb870c8 | 614 | irb = (struct irb *)&S390_lowcore.irb; |
191fd44c | 615 | /* Store interrupt response block to lowcore. */ |
b603d258 | 616 | if (tsch(sch->schid, irb) != 0) |
191fd44c | 617 | /* Not status pending or not operational. */ |
b603d258 MS |
618 | return; |
619 | memcpy(&sch->schib.scsw, &irb->scsw, sizeof(union scsw)); | |
620 | /* Call interrupt handler with updated status. */ | |
191fd44c | 621 | irq_context = in_interrupt(); |
b603d258 | 622 | if (!irq_context) { |
191fd44c | 623 | local_bh_disable(); |
b603d258 MS |
624 | irq_enter(); |
625 | } | |
1f44a225 | 626 | kstat_incr_irqs_this_cpu(IO_INTERRUPT, irq_desc_io); |
191fd44c HC |
627 | if (sch->driver && sch->driver->irq) |
628 | sch->driver->irq(sch); | |
de400d6b | 629 | else |
420f42ec | 630 | inc_irq_stat(IRQIO_CIO); |
b603d258 MS |
631 | if (!irq_context) { |
632 | irq_exit(); | |
191fd44c | 633 | _local_bh_enable(); |
b603d258 | 634 | } |
191fd44c HC |
635 | } |
636 | ||
863fc849 | 637 | static int cio_test_for_console(struct subchannel_id schid, void *data) |
cd6b4f27 | 638 | { |
863fc849 | 639 | struct schib schib; |
cd6b4f27 | 640 | |
863fc849 | 641 | if (stsch_err(schid, &schib) != 0) |
f97a56fb | 642 | return -ENXIO; |
863fc849 SO |
643 | if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv && |
644 | (schib.pmcw.dev == console_devno)) { | |
f97a56fb CH |
645 | console_irq = schid.sch_no; |
646 | return 1; /* found */ | |
647 | } | |
648 | return 0; | |
649 | } | |
650 | ||
863fc849 | 651 | static int cio_get_console_sch_no(void) |
1da177e4 | 652 | { |
a8237fc4 | 653 | struct subchannel_id schid; |
863fc849 SO |
654 | struct schib schib; |
655 | ||
a8237fc4 | 656 | init_subchannel_id(&schid); |
1da177e4 LT |
657 | if (console_irq != -1) { |
658 | /* VM provided us with the irq number of the console. */ | |
a8237fc4 | 659 | schid.sch_no = console_irq; |
863fc849 SO |
660 | if (stsch_err(schid, &schib) != 0 || |
661 | (schib.pmcw.st != SUBCHANNEL_TYPE_IO) || !schib.pmcw.dnv) | |
1da177e4 | 662 | return -1; |
863fc849 | 663 | console_devno = schib.pmcw.dev; |
1da177e4 LT |
664 | } else if (console_devno != -1) { |
665 | /* At least the console device number is known. */ | |
f97a56fb | 666 | for_each_subchannel(cio_test_for_console, NULL); |
1da177e4 LT |
667 | } |
668 | return console_irq; | |
669 | } | |
670 | ||
863fc849 | 671 | struct subchannel *cio_probe_console(void) |
1da177e4 | 672 | { |
a8237fc4 | 673 | struct subchannel_id schid; |
863fc849 SO |
674 | struct subchannel *sch; |
675 | int sch_no, ret; | |
1da177e4 | 676 | |
f97a56fb CH |
677 | sch_no = cio_get_console_sch_no(); |
678 | if (sch_no == -1) { | |
e6d5a428 | 679 | pr_warning("No CCW console was found\n"); |
1da177e4 LT |
680 | return ERR_PTR(-ENODEV); |
681 | } | |
a8237fc4 | 682 | init_subchannel_id(&schid); |
f97a56fb | 683 | schid.sch_no = sch_no; |
863fc849 SO |
684 | sch = css_alloc_subchannel(schid); |
685 | if (IS_ERR(sch)) | |
686 | return sch; | |
1da177e4 | 687 | |
6ef556cc | 688 | isc_register(CONSOLE_ISC); |
863fc849 SO |
689 | sch->config.isc = CONSOLE_ISC; |
690 | sch->config.intparm = (u32)(addr_t)sch; | |
691 | ret = cio_commit_config(sch); | |
1da177e4 | 692 | if (ret) { |
6ef556cc | 693 | isc_unregister(CONSOLE_ISC); |
863fc849 | 694 | put_device(&sch->dev); |
1da177e4 LT |
695 | return ERR_PTR(ret); |
696 | } | |
863fc849 SO |
697 | console_sch = sch; |
698 | return sch; | |
1da177e4 LT |
699 | } |
700 | ||
863fc849 | 701 | int cio_is_console(struct subchannel_id schid) |
1da177e4 | 702 | { |
863fc849 | 703 | if (!console_sch) |
1da177e4 | 704 | return 0; |
863fc849 | 705 | return schid_equal(&schid, &console_sch->schid); |
1da177e4 LT |
706 | } |
707 | ||
14556b33 | 708 | void cio_register_early_subchannels(void) |
1da177e4 | 709 | { |
14556b33 SO |
710 | int ret; |
711 | ||
712 | if (!console_sch) | |
713 | return; | |
714 | ||
715 | ret = css_register_subchannel(console_sch); | |
716 | if (ret) | |
717 | put_device(&console_sch->dev); | |
1da177e4 | 718 | } |
863fc849 | 719 | #endif /* CONFIG_CCW_CONSOLE */ |
1da177e4 | 720 | |
4d284cac | 721 | static int |
a8237fc4 | 722 | __disable_subchannel_easy(struct subchannel_id schid, struct schib *schib) |
1da177e4 LT |
723 | { |
724 | int retry, cc; | |
725 | ||
726 | cc = 0; | |
727 | for (retry=0;retry<3;retry++) { | |
728 | schib->pmcw.ena = 0; | |
8821d24c | 729 | cc = msch_err(schid, schib); |
1da177e4 LT |
730 | if (cc) |
731 | return (cc==3?-ENODEV:-EBUSY); | |
8821d24c | 732 | if (stsch_err(schid, schib) || !css_sch_is_valid(schib)) |
cdb912a4 | 733 | return -ENODEV; |
1da177e4 LT |
734 | if (!schib->pmcw.ena) |
735 | return 0; | |
736 | } | |
737 | return -EBUSY; /* uhm... */ | |
738 | } | |
739 | ||
4d284cac | 740 | static int |
0ae7a7b2 | 741 | __clear_io_subchannel_easy(struct subchannel_id schid) |
1da177e4 LT |
742 | { |
743 | int retry; | |
744 | ||
745 | if (csch(schid)) | |
746 | return -ENODEV; | |
747 | for (retry=0;retry<20;retry++) { | |
748 | struct tpi_info ti; | |
749 | ||
750 | if (tpi(&ti)) { | |
cbb870c8 | 751 | tsch(ti.schid, (struct irb *)&S390_lowcore.irb); |
a8237fc4 | 752 | if (schid_equal(&ti.schid, &schid)) |
4c24da79 | 753 | return 0; |
1da177e4 | 754 | } |
5a0d0e65 | 755 | udelay_simple(100); |
1da177e4 LT |
756 | } |
757 | return -EBUSY; | |
758 | } | |
759 | ||
9d92a7e1 CH |
760 | static void __clear_chsc_subchannel_easy(void) |
761 | { | |
762 | /* It seems we can only wait for a bit here :/ */ | |
5a0d0e65 | 763 | udelay_simple(100); |
9d92a7e1 CH |
764 | } |
765 | ||
a45e1414 MH |
766 | static int pgm_check_occured; |
767 | ||
768 | static void cio_reset_pgm_check_handler(void) | |
769 | { | |
770 | pgm_check_occured = 1; | |
771 | } | |
772 | ||
f9c9fe3e | 773 | static int stsch_reset(struct subchannel_id schid, struct schib *addr) |
a45e1414 MH |
774 | { |
775 | int rc; | |
776 | ||
777 | pgm_check_occured = 0; | |
ab14de6c | 778 | s390_base_pgm_handler_fn = cio_reset_pgm_check_handler; |
8821d24c | 779 | rc = stsch_err(schid, addr); |
ab14de6c | 780 | s390_base_pgm_handler_fn = NULL; |
aa77015c | 781 | |
ab14de6c | 782 | /* The program check handler could have changed pgm_check_occured. */ |
6faf4444 | 783 | barrier(); |
aa77015c | 784 | |
a45e1414 MH |
785 | if (pgm_check_occured) |
786 | return -EIO; | |
787 | else | |
788 | return rc; | |
789 | } | |
790 | ||
15e9b586 | 791 | static int __shutdown_subchannel_easy(struct subchannel_id schid, void *data) |
f97a56fb CH |
792 | { |
793 | struct schib schib; | |
794 | ||
a45e1414 | 795 | if (stsch_reset(schid, &schib)) |
f97a56fb CH |
796 | return -ENXIO; |
797 | if (!schib.pmcw.ena) | |
798 | return 0; | |
799 | switch(__disable_subchannel_easy(schid, &schib)) { | |
800 | case 0: | |
801 | case -ENODEV: | |
802 | break; | |
803 | default: /* -EBUSY */ | |
0ae7a7b2 CH |
804 | switch (schib.pmcw.st) { |
805 | case SUBCHANNEL_TYPE_IO: | |
806 | if (__clear_io_subchannel_easy(schid)) | |
807 | goto out; /* give up... */ | |
808 | break; | |
9d92a7e1 CH |
809 | case SUBCHANNEL_TYPE_CHSC: |
810 | __clear_chsc_subchannel_easy(); | |
811 | break; | |
0ae7a7b2 CH |
812 | default: |
813 | /* No default clear strategy */ | |
814 | break; | |
815 | } | |
8821d24c | 816 | stsch_err(schid, &schib); |
f97a56fb CH |
817 | __disable_subchannel_easy(schid, &schib); |
818 | } | |
0ae7a7b2 | 819 | out: |
f97a56fb CH |
820 | return 0; |
821 | } | |
1da177e4 | 822 | |
15e9b586 HC |
823 | static atomic_t chpid_reset_count; |
824 | ||
825 | static void s390_reset_chpids_mcck_handler(void) | |
826 | { | |
827 | struct crw crw; | |
828 | struct mci *mci; | |
829 | ||
830 | /* Check for pending channel report word. */ | |
831 | mci = (struct mci *)&S390_lowcore.mcck_interruption_code; | |
832 | if (!mci->cp) | |
833 | return; | |
834 | /* Process channel report words. */ | |
835 | while (stcrw(&crw) == 0) { | |
836 | /* Check for responses to RCHP. */ | |
837 | if (crw.slct && crw.rsc == CRW_RSC_CPATH) | |
838 | atomic_dec(&chpid_reset_count); | |
839 | } | |
840 | } | |
841 | ||
842 | #define RCHP_TIMEOUT (30 * USEC_PER_SEC) | |
843 | static void css_reset(void) | |
844 | { | |
845 | int i, ret; | |
846 | unsigned long long timeout; | |
f86635fa | 847 | struct chp_id chpid; |
15e9b586 HC |
848 | |
849 | /* Reset subchannels. */ | |
850 | for_each_subchannel(__shutdown_subchannel_easy, NULL); | |
851 | /* Reset channel paths. */ | |
ab14de6c | 852 | s390_base_mcck_handler_fn = s390_reset_chpids_mcck_handler; |
15e9b586 HC |
853 | /* Enable channel report machine checks. */ |
854 | __ctl_set_bit(14, 28); | |
855 | /* Temporarily reenable machine checks. */ | |
856 | local_mcck_enable(); | |
f86635fa | 857 | chp_id_init(&chpid); |
15e9b586 | 858 | for (i = 0; i <= __MAX_CHPID; i++) { |
f86635fa PO |
859 | chpid.id = i; |
860 | ret = rchp(chpid); | |
15e9b586 HC |
861 | if ((ret == 0) || (ret == 2)) |
862 | /* | |
863 | * rchp either succeeded, or another rchp is already | |
864 | * in progress. In either case, we'll get a crw. | |
865 | */ | |
866 | atomic_inc(&chpid_reset_count); | |
867 | } | |
868 | /* Wait for machine check for all channel paths. */ | |
8c071b0f | 869 | timeout = get_tod_clock_fast() + (RCHP_TIMEOUT << 12); |
15e9b586 | 870 | while (atomic_read(&chpid_reset_count) != 0) { |
8c071b0f | 871 | if (get_tod_clock_fast() > timeout) |
15e9b586 HC |
872 | break; |
873 | cpu_relax(); | |
874 | } | |
875 | /* Disable machine checks again. */ | |
876 | local_mcck_disable(); | |
877 | /* Disable channel report machine checks. */ | |
878 | __ctl_clear_bit(14, 28); | |
ab14de6c | 879 | s390_base_mcck_handler_fn = NULL; |
15e9b586 HC |
880 | } |
881 | ||
882 | static struct reset_call css_reset_call = { | |
883 | .fn = css_reset, | |
884 | }; | |
885 | ||
886 | static int __init init_css_reset_call(void) | |
887 | { | |
888 | atomic_set(&chpid_reset_count, 0); | |
889 | register_reset_call(&css_reset_call); | |
890 | return 0; | |
891 | } | |
892 | ||
893 | arch_initcall(init_css_reset_call); | |
894 | ||
895 | struct sch_match_id { | |
896 | struct subchannel_id schid; | |
897 | struct ccw_dev_id devid; | |
898 | int rc; | |
899 | }; | |
900 | ||
901 | static int __reipl_subchannel_match(struct subchannel_id schid, void *data) | |
902 | { | |
903 | struct schib schib; | |
904 | struct sch_match_id *match_id = data; | |
905 | ||
a45e1414 | 906 | if (stsch_reset(schid, &schib)) |
15e9b586 | 907 | return -ENXIO; |
b279a4f5 | 908 | if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv && |
15e9b586 HC |
909 | (schib.pmcw.dev == match_id->devid.devno) && |
910 | (schid.ssid == match_id->devid.ssid)) { | |
911 | match_id->schid = schid; | |
912 | match_id->rc = 0; | |
913 | return 1; | |
914 | } | |
915 | return 0; | |
916 | } | |
917 | ||
918 | static int reipl_find_schid(struct ccw_dev_id *devid, | |
919 | struct subchannel_id *schid) | |
1da177e4 | 920 | { |
ff6b8ea6 MH |
921 | struct sch_match_id match_id; |
922 | ||
923 | match_id.devid = *devid; | |
924 | match_id.rc = -ENODEV; | |
15e9b586 | 925 | for_each_subchannel(__reipl_subchannel_match, &match_id); |
ff6b8ea6 MH |
926 | if (match_id.rc == 0) |
927 | *schid = match_id.schid; | |
928 | return match_id.rc; | |
1da177e4 LT |
929 | } |
930 | ||
ff6b8ea6 MH |
931 | extern void do_reipl_asm(__u32 schid); |
932 | ||
1da177e4 | 933 | /* Make sure all subchannels are quiet before we re-ipl an lpar. */ |
ff6b8ea6 | 934 | void reipl_ccw_dev(struct ccw_dev_id *devid) |
1da177e4 | 935 | { |
41459d36 | 936 | struct subchannel_id uninitialized_var(schid); |
ff6b8ea6 | 937 | |
60a0c68d | 938 | s390_reset_system(NULL, NULL); |
15e9b586 | 939 | if (reipl_find_schid(devid, &schid) != 0) |
ff6b8ea6 | 940 | panic("IPL Device not found\n"); |
ff6b8ea6 | 941 | do_reipl_asm(*((__u32*)&schid)); |
1da177e4 | 942 | } |
e87bfe51 | 943 | |
6fc321fd | 944 | int __init cio_get_iplinfo(struct cio_iplinfo *iplinfo) |
e87bfe51 HC |
945 | { |
946 | struct subchannel_id schid; | |
6fc321fd | 947 | struct schib schib; |
e87bfe51 | 948 | |
cbb870c8 | 949 | schid = *(struct subchannel_id *)&S390_lowcore.subchannel_id; |
e87bfe51 | 950 | if (!schid.one) |
6fc321fd | 951 | return -ENODEV; |
8821d24c | 952 | if (stsch_err(schid, &schib)) |
6fc321fd | 953 | return -ENODEV; |
b279a4f5 CH |
954 | if (schib.pmcw.st != SUBCHANNEL_TYPE_IO) |
955 | return -ENODEV; | |
6fc321fd HC |
956 | if (!schib.pmcw.dnv) |
957 | return -ENODEV; | |
958 | iplinfo->devno = schib.pmcw.dev; | |
959 | iplinfo->is_qdio = schib.pmcw.qf; | |
960 | return 0; | |
e87bfe51 | 961 | } |
83262d63 PO |
962 | |
963 | /** | |
964 | * cio_tm_start_key - perform start function | |
965 | * @sch: subchannel on which to perform the start function | |
966 | * @tcw: transport-command word to be started | |
967 | * @lpm: mask of paths to use | |
968 | * @key: storage key to use for storage access | |
969 | * | |
970 | * Start the tcw on the given subchannel. Return zero on success, non-zero | |
971 | * otherwise. | |
972 | */ | |
973 | int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key) | |
974 | { | |
975 | int cc; | |
976 | union orb *orb = &to_io_private(sch)->orb; | |
977 | ||
978 | memset(orb, 0, sizeof(union orb)); | |
979 | orb->tm.intparm = (u32) (addr_t) sch; | |
980 | orb->tm.key = key >> 4; | |
981 | orb->tm.b = 1; | |
982 | orb->tm.lpm = lpm ? lpm : sch->lpm; | |
983 | orb->tm.tcw = (u32) (addr_t) tcw; | |
984 | cc = ssch(sch->schid, orb); | |
985 | switch (cc) { | |
986 | case 0: | |
987 | return 0; | |
988 | case 1: | |
989 | case 2: | |
990 | return -EBUSY; | |
991 | default: | |
992 | return cio_start_handle_notoper(sch, lpm); | |
993 | } | |
994 | } | |
995 | ||
996 | /** | |
997 | * cio_tm_intrg - perform interrogate function | |
998 | * @sch - subchannel on which to perform the interrogate function | |
999 | * | |
1000 | * If the specified subchannel is running in transport-mode, perform the | |
1001 | * interrogate function. Return zero on success, non-zero otherwie. | |
1002 | */ | |
1003 | int cio_tm_intrg(struct subchannel *sch) | |
1004 | { | |
1005 | int cc; | |
1006 | ||
1007 | if (!to_io_private(sch)->orb.tm.b) | |
1008 | return -EINVAL; | |
1009 | cc = xsch(sch->schid); | |
1010 | switch (cc) { | |
1011 | case 0: | |
1012 | case 2: | |
1013 | return 0; | |
1014 | case 1: | |
1015 | return -EBUSY; | |
1016 | default: | |
1017 | return -ENODEV; | |
1018 | } | |
1019 | } |