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1da177e4 LT |
1 | /* |
2 | * drivers/s390/cio/device_pgid.c | |
3 | * | |
4 | * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, | |
5 | * IBM Corporation | |
6 | * Author(s): Cornelia Huck(cohuck@de.ibm.com) | |
7 | * Martin Schwidefsky (schwidefsky@de.ibm.com) | |
8 | * | |
9 | * Path Group ID functions. | |
10 | */ | |
11 | ||
12 | #include <linux/config.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/init.h> | |
15 | ||
16 | #include <asm/ccwdev.h> | |
17 | #include <asm/cio.h> | |
18 | #include <asm/delay.h> | |
19 | #include <asm/lowcore.h> | |
20 | ||
21 | #include "cio.h" | |
22 | #include "cio_debug.h" | |
23 | #include "css.h" | |
24 | #include "device.h" | |
25 | ||
26 | /* | |
27 | * Start Sense Path Group ID helper function. Used in ccw_device_recog | |
28 | * and ccw_device_sense_pgid. | |
29 | */ | |
30 | static int | |
31 | __ccw_device_sense_pgid_start(struct ccw_device *cdev) | |
32 | { | |
33 | struct subchannel *sch; | |
34 | struct ccw1 *ccw; | |
35 | int ret; | |
36 | ||
37 | sch = to_subchannel(cdev->dev.parent); | |
38 | /* Setup sense path group id channel program. */ | |
39 | ccw = cdev->private->iccws; | |
40 | ccw->cmd_code = CCW_CMD_SENSE_PGID; | |
41 | ccw->cda = (__u32) __pa (&cdev->private->pgid); | |
42 | ccw->count = sizeof (struct pgid); | |
43 | ccw->flags = CCW_FLAG_SLI; | |
44 | ||
45 | /* Reset device status. */ | |
46 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
47 | /* Try on every path. */ | |
48 | ret = -ENODEV; | |
49 | while (cdev->private->imask != 0) { | |
50 | /* Try every path multiple times. */ | |
51 | if (cdev->private->iretry > 0) { | |
52 | cdev->private->iretry--; | |
53 | ret = cio_start (sch, cdev->private->iccws, | |
54 | cdev->private->imask); | |
55 | /* ret is 0, -EBUSY, -EACCES or -ENODEV */ | |
56 | if (ret != -EACCES) | |
57 | return ret; | |
58 | CIO_MSG_EVENT(2, "SNID - Device %04x on Subchannel " | |
59 | "%04x, lpm %02X, became 'not " | |
60 | "operational'\n", | |
61 | cdev->private->devno, sch->irq, | |
62 | cdev->private->imask); | |
63 | ||
64 | } | |
65 | cdev->private->imask >>= 1; | |
66 | cdev->private->iretry = 5; | |
67 | } | |
68 | return ret; | |
69 | } | |
70 | ||
71 | void | |
72 | ccw_device_sense_pgid_start(struct ccw_device *cdev) | |
73 | { | |
74 | int ret; | |
75 | ||
76 | cdev->private->state = DEV_STATE_SENSE_PGID; | |
77 | cdev->private->imask = 0x80; | |
78 | cdev->private->iretry = 5; | |
79 | memset (&cdev->private->pgid, 0, sizeof (struct pgid)); | |
80 | ret = __ccw_device_sense_pgid_start(cdev); | |
81 | if (ret && ret != -EBUSY) | |
82 | ccw_device_sense_pgid_done(cdev, ret); | |
83 | } | |
84 | ||
85 | /* | |
86 | * Called from interrupt context to check if a valid answer | |
87 | * to Sense Path Group ID was received. | |
88 | */ | |
89 | static int | |
90 | __ccw_device_check_sense_pgid(struct ccw_device *cdev) | |
91 | { | |
92 | struct subchannel *sch; | |
93 | struct irb *irb; | |
94 | ||
95 | sch = to_subchannel(cdev->dev.parent); | |
96 | irb = &cdev->private->irb; | |
97 | if (irb->scsw.fctl & (SCSW_FCTL_HALT_FUNC | SCSW_FCTL_CLEAR_FUNC)) | |
98 | return -ETIME; | |
99 | if (irb->esw.esw0.erw.cons && | |
100 | (irb->ecw[0]&(SNS0_CMD_REJECT|SNS0_INTERVENTION_REQ))) { | |
101 | /* | |
102 | * If the device doesn't support the Sense Path Group ID | |
103 | * command further retries wouldn't help ... | |
104 | */ | |
105 | return -EOPNOTSUPP; | |
106 | } | |
107 | if (irb->esw.esw0.erw.cons) { | |
108 | CIO_MSG_EVENT(2, "SNID - device %04x, unit check, " | |
109 | "lpum %02X, cnt %02d, sns : " | |
110 | "%02X%02X%02X%02X %02X%02X%02X%02X ...\n", | |
111 | cdev->private->devno, | |
112 | irb->esw.esw0.sublog.lpum, | |
113 | irb->esw.esw0.erw.scnt, | |
114 | irb->ecw[0], irb->ecw[1], | |
115 | irb->ecw[2], irb->ecw[3], | |
116 | irb->ecw[4], irb->ecw[5], | |
117 | irb->ecw[6], irb->ecw[7]); | |
118 | return -EAGAIN; | |
119 | } | |
120 | if (irb->scsw.cc == 3) { | |
121 | CIO_MSG_EVENT(2, "SNID - Device %04x on Subchannel " | |
122 | "%04x, lpm %02X, became 'not operational'\n", | |
123 | cdev->private->devno, sch->irq, sch->orb.lpm); | |
124 | return -EACCES; | |
125 | } | |
126 | if (cdev->private->pgid.inf.ps.state2 == SNID_STATE2_RESVD_ELSE) { | |
127 | CIO_MSG_EVENT(2, "SNID - Device %04x on Subchannel %04x " | |
128 | "is reserved by someone else\n", | |
129 | cdev->private->devno, sch->irq); | |
130 | return -EUSERS; | |
131 | } | |
132 | return 0; | |
133 | } | |
134 | ||
135 | /* | |
136 | * Got interrupt for Sense Path Group ID. | |
137 | */ | |
138 | void | |
139 | ccw_device_sense_pgid_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
140 | { | |
141 | struct subchannel *sch; | |
142 | struct irb *irb; | |
143 | int ret; | |
144 | ||
145 | irb = (struct irb *) __LC_IRB; | |
146 | /* Retry sense pgid for cc=1. */ | |
147 | if (irb->scsw.stctl == | |
148 | (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) { | |
149 | if (irb->scsw.cc == 1) { | |
150 | ret = __ccw_device_sense_pgid_start(cdev); | |
151 | if (ret && ret != -EBUSY) | |
152 | ccw_device_sense_pgid_done(cdev, ret); | |
153 | } | |
154 | return; | |
155 | } | |
156 | if (ccw_device_accumulate_and_sense(cdev, irb) != 0) | |
157 | return; | |
158 | sch = to_subchannel(cdev->dev.parent); | |
159 | ret = __ccw_device_check_sense_pgid(cdev); | |
160 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
161 | switch (ret) { | |
162 | /* 0, -ETIME, -EOPNOTSUPP, -EAGAIN, -EACCES or -EUSERS */ | |
163 | case 0: /* Sense Path Group ID successful. */ | |
164 | if (cdev->private->pgid.inf.ps.state1 == SNID_STATE1_RESET) | |
165 | memcpy(&cdev->private->pgid, &global_pgid, | |
166 | sizeof(struct pgid)); | |
167 | ccw_device_sense_pgid_done(cdev, 0); | |
168 | break; | |
169 | case -EOPNOTSUPP: /* Sense Path Group ID not supported */ | |
170 | ccw_device_sense_pgid_done(cdev, -EOPNOTSUPP); | |
171 | break; | |
172 | case -ETIME: /* Sense path group id stopped by timeout. */ | |
173 | ccw_device_sense_pgid_done(cdev, -ETIME); | |
174 | break; | |
175 | case -EACCES: /* channel is not operational. */ | |
176 | sch->lpm &= ~cdev->private->imask; | |
177 | cdev->private->imask >>= 1; | |
178 | cdev->private->iretry = 5; | |
179 | /* Fall through. */ | |
180 | case -EAGAIN: /* Try again. */ | |
181 | ret = __ccw_device_sense_pgid_start(cdev); | |
182 | if (ret != 0 && ret != -EBUSY) | |
183 | ccw_device_sense_pgid_done(cdev, -ENODEV); | |
184 | break; | |
185 | case -EUSERS: /* device is reserved for someone else. */ | |
186 | ccw_device_sense_pgid_done(cdev, -EUSERS); | |
187 | break; | |
188 | } | |
189 | } | |
190 | ||
191 | /* | |
192 | * Path Group ID helper function. | |
193 | */ | |
194 | static int | |
195 | __ccw_device_do_pgid(struct ccw_device *cdev, __u8 func) | |
196 | { | |
197 | struct subchannel *sch; | |
198 | struct ccw1 *ccw; | |
199 | int ret; | |
200 | ||
201 | sch = to_subchannel(cdev->dev.parent); | |
202 | ||
203 | /* Setup sense path group id channel program. */ | |
204 | cdev->private->pgid.inf.fc = func; | |
205 | ccw = cdev->private->iccws; | |
206 | if (!cdev->private->flags.pgid_single) { | |
207 | cdev->private->pgid.inf.fc |= SPID_FUNC_MULTI_PATH; | |
208 | ccw->cmd_code = CCW_CMD_SUSPEND_RECONN; | |
209 | ccw->cda = 0; | |
210 | ccw->count = 0; | |
211 | ccw->flags = CCW_FLAG_SLI | CCW_FLAG_CC; | |
212 | ccw++; | |
213 | } else | |
214 | cdev->private->pgid.inf.fc |= SPID_FUNC_SINGLE_PATH; | |
215 | ||
216 | ccw->cmd_code = CCW_CMD_SET_PGID; | |
217 | ccw->cda = (__u32) __pa (&cdev->private->pgid); | |
218 | ccw->count = sizeof (struct pgid); | |
219 | ccw->flags = CCW_FLAG_SLI; | |
220 | ||
221 | /* Reset device status. */ | |
222 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
223 | ||
224 | /* Try multiple times. */ | |
225 | ret = -ENODEV; | |
226 | if (cdev->private->iretry > 0) { | |
227 | cdev->private->iretry--; | |
228 | ret = cio_start (sch, cdev->private->iccws, | |
229 | cdev->private->imask); | |
230 | /* ret is 0, -EBUSY, -EACCES or -ENODEV */ | |
231 | if ((ret != -EACCES) && (ret != -ENODEV)) | |
232 | return ret; | |
233 | } | |
234 | /* PGID command failed on this path. Switch it off. */ | |
235 | sch->lpm &= ~cdev->private->imask; | |
236 | sch->vpm &= ~cdev->private->imask; | |
237 | CIO_MSG_EVENT(2, "SPID - Device %04x on Subchannel " | |
238 | "%04x, lpm %02X, became 'not operational'\n", | |
239 | cdev->private->devno, sch->irq, cdev->private->imask); | |
240 | return ret; | |
241 | } | |
242 | ||
243 | /* | |
244 | * Called from interrupt context to check if a valid answer | |
245 | * to Set Path Group ID was received. | |
246 | */ | |
247 | static int | |
248 | __ccw_device_check_pgid(struct ccw_device *cdev) | |
249 | { | |
250 | struct subchannel *sch; | |
251 | struct irb *irb; | |
252 | ||
253 | sch = to_subchannel(cdev->dev.parent); | |
254 | irb = &cdev->private->irb; | |
255 | if (irb->scsw.fctl & (SCSW_FCTL_HALT_FUNC | SCSW_FCTL_CLEAR_FUNC)) | |
256 | return -ETIME; | |
257 | if (irb->esw.esw0.erw.cons) { | |
258 | if (irb->ecw[0] & SNS0_CMD_REJECT) | |
259 | return -EOPNOTSUPP; | |
260 | /* Hmm, whatever happened, try again. */ | |
261 | CIO_MSG_EVENT(2, "SPID - device %04x, unit check, cnt %02d, " | |
262 | "sns : %02X%02X%02X%02X %02X%02X%02X%02X ...\n", | |
263 | cdev->private->devno, irb->esw.esw0.erw.scnt, | |
264 | irb->ecw[0], irb->ecw[1], | |
265 | irb->ecw[2], irb->ecw[3], | |
266 | irb->ecw[4], irb->ecw[5], | |
267 | irb->ecw[6], irb->ecw[7]); | |
268 | return -EAGAIN; | |
269 | } | |
270 | if (irb->scsw.cc == 3) { | |
271 | CIO_MSG_EVENT(2, "SPID - Device %04x on Subchannel " | |
272 | "%04x, lpm %02X, became 'not operational'\n", | |
273 | cdev->private->devno, sch->irq, | |
274 | cdev->private->imask); | |
275 | return -EACCES; | |
276 | } | |
277 | return 0; | |
278 | } | |
279 | ||
280 | static void | |
281 | __ccw_device_verify_start(struct ccw_device *cdev) | |
282 | { | |
283 | struct subchannel *sch; | |
284 | __u8 imask, func; | |
285 | int ret; | |
286 | ||
287 | sch = to_subchannel(cdev->dev.parent); | |
288 | while (sch->vpm != sch->lpm) { | |
289 | /* Find first unequal bit in vpm vs. lpm */ | |
290 | for (imask = 0x80; imask != 0; imask >>= 1) | |
291 | if ((sch->vpm & imask) != (sch->lpm & imask)) | |
292 | break; | |
293 | cdev->private->imask = imask; | |
294 | func = (sch->vpm & imask) ? | |
295 | SPID_FUNC_RESIGN : SPID_FUNC_ESTABLISH; | |
296 | ret = __ccw_device_do_pgid(cdev, func); | |
297 | if (ret == 0 || ret == -EBUSY) | |
298 | return; | |
299 | cdev->private->iretry = 5; | |
300 | } | |
301 | ccw_device_verify_done(cdev, (sch->lpm != 0) ? 0 : -ENODEV); | |
302 | } | |
303 | ||
304 | /* | |
305 | * Got interrupt for Set Path Group ID. | |
306 | */ | |
307 | void | |
308 | ccw_device_verify_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
309 | { | |
310 | struct subchannel *sch; | |
311 | struct irb *irb; | |
312 | int ret; | |
313 | ||
314 | irb = (struct irb *) __LC_IRB; | |
315 | /* Retry set pgid for cc=1. */ | |
316 | if (irb->scsw.stctl == | |
317 | (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) { | |
318 | if (irb->scsw.cc == 1) | |
319 | __ccw_device_verify_start(cdev); | |
320 | return; | |
321 | } | |
322 | if (ccw_device_accumulate_and_sense(cdev, irb) != 0) | |
323 | return; | |
324 | sch = to_subchannel(cdev->dev.parent); | |
325 | ret = __ccw_device_check_pgid(cdev); | |
326 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
327 | switch (ret) { | |
328 | /* 0, -ETIME, -EAGAIN, -EOPNOTSUPP or -EACCES */ | |
329 | case 0: | |
330 | /* Establish or Resign Path Group done. Update vpm. */ | |
331 | if ((sch->lpm & cdev->private->imask) != 0) | |
332 | sch->vpm |= cdev->private->imask; | |
333 | else | |
334 | sch->vpm &= ~cdev->private->imask; | |
335 | cdev->private->iretry = 5; | |
336 | __ccw_device_verify_start(cdev); | |
337 | break; | |
338 | case -EOPNOTSUPP: | |
339 | /* | |
340 | * One of those strange devices which claim to be able | |
341 | * to do multipathing but not for Set Path Group ID. | |
342 | */ | |
343 | if (cdev->private->flags.pgid_single) { | |
344 | ccw_device_verify_done(cdev, -EOPNOTSUPP); | |
345 | break; | |
346 | } | |
347 | cdev->private->flags.pgid_single = 1; | |
348 | /* fall through. */ | |
349 | case -EAGAIN: /* Try again. */ | |
350 | __ccw_device_verify_start(cdev); | |
351 | break; | |
352 | case -ETIME: /* Set path group id stopped by timeout. */ | |
353 | ccw_device_verify_done(cdev, -ETIME); | |
354 | break; | |
355 | case -EACCES: /* channel is not operational. */ | |
356 | sch->lpm &= ~cdev->private->imask; | |
357 | sch->vpm &= ~cdev->private->imask; | |
358 | cdev->private->iretry = 5; | |
359 | __ccw_device_verify_start(cdev); | |
360 | break; | |
361 | } | |
362 | } | |
363 | ||
364 | void | |
365 | ccw_device_verify_start(struct ccw_device *cdev) | |
366 | { | |
367 | cdev->private->flags.pgid_single = 0; | |
368 | cdev->private->iretry = 5; | |
369 | __ccw_device_verify_start(cdev); | |
370 | } | |
371 | ||
372 | static void | |
373 | __ccw_device_disband_start(struct ccw_device *cdev) | |
374 | { | |
375 | struct subchannel *sch; | |
376 | int ret; | |
377 | ||
378 | sch = to_subchannel(cdev->dev.parent); | |
379 | while (cdev->private->imask != 0) { | |
380 | if (sch->lpm & cdev->private->imask) { | |
381 | ret = __ccw_device_do_pgid(cdev, SPID_FUNC_DISBAND); | |
382 | if (ret == 0) | |
383 | return; | |
384 | } | |
385 | cdev->private->iretry = 5; | |
386 | cdev->private->imask >>= 1; | |
387 | } | |
388 | ccw_device_verify_done(cdev, (sch->lpm != 0) ? 0 : -ENODEV); | |
389 | } | |
390 | ||
391 | /* | |
392 | * Got interrupt for Unset Path Group ID. | |
393 | */ | |
394 | void | |
395 | ccw_device_disband_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
396 | { | |
397 | struct subchannel *sch; | |
398 | struct irb *irb; | |
399 | int ret; | |
400 | ||
401 | irb = (struct irb *) __LC_IRB; | |
402 | /* Retry set pgid for cc=1. */ | |
403 | if (irb->scsw.stctl == | |
404 | (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) { | |
405 | if (irb->scsw.cc == 1) | |
406 | __ccw_device_disband_start(cdev); | |
407 | return; | |
408 | } | |
409 | if (ccw_device_accumulate_and_sense(cdev, irb) != 0) | |
410 | return; | |
411 | sch = to_subchannel(cdev->dev.parent); | |
412 | ret = __ccw_device_check_pgid(cdev); | |
413 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
414 | switch (ret) { | |
415 | /* 0, -ETIME, -EAGAIN, -EOPNOTSUPP or -EACCES */ | |
416 | case 0: /* disband successful. */ | |
417 | sch->vpm = 0; | |
418 | ccw_device_disband_done(cdev, ret); | |
419 | break; | |
420 | case -EOPNOTSUPP: | |
421 | /* | |
422 | * One of those strange devices which claim to be able | |
423 | * to do multipathing but not for Unset Path Group ID. | |
424 | */ | |
425 | cdev->private->flags.pgid_single = 1; | |
426 | /* fall through. */ | |
427 | case -EAGAIN: /* Try again. */ | |
428 | __ccw_device_disband_start(cdev); | |
429 | break; | |
430 | case -ETIME: /* Set path group id stopped by timeout. */ | |
431 | ccw_device_disband_done(cdev, -ETIME); | |
432 | break; | |
433 | case -EACCES: /* channel is not operational. */ | |
434 | cdev->private->imask >>= 1; | |
435 | cdev->private->iretry = 5; | |
436 | __ccw_device_disband_start(cdev); | |
437 | break; | |
438 | } | |
439 | } | |
440 | ||
441 | void | |
442 | ccw_device_disband_start(struct ccw_device *cdev) | |
443 | { | |
444 | cdev->private->flags.pgid_single = 0; | |
445 | cdev->private->iretry = 5; | |
446 | cdev->private->imask = 0x80; | |
447 | __ccw_device_disband_start(cdev); | |
448 | } |