2 * drivers/s390/cio/device_pgid.c
4 * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
6 * Author(s): Cornelia Huck(cohuck@de.ibm.com)
7 * Martin Schwidefsky (schwidefsky@de.ibm.com)
9 * Path Group ID functions.
12 #include <linux/config.h>
13 #include <linux/module.h>
14 #include <linux/init.h>
16 #include <asm/ccwdev.h>
18 #include <asm/delay.h>
19 #include <asm/lowcore.h>
22 #include "cio_debug.h"
28 * Start Sense Path Group ID helper function. Used in ccw_device_recog
29 * and ccw_device_sense_pgid.
32 __ccw_device_sense_pgid_start(struct ccw_device *cdev)
34 struct subchannel *sch;
38 sch = to_subchannel(cdev->dev.parent);
39 /* Setup sense path group id channel program. */
40 ccw = cdev->private->iccws;
41 ccw->cmd_code = CCW_CMD_SENSE_PGID;
42 ccw->cda = (__u32) __pa (&cdev->private->pgid);
43 ccw->count = sizeof (struct pgid);
44 ccw->flags = CCW_FLAG_SLI;
46 /* Reset device status. */
47 memset(&cdev->private->irb, 0, sizeof(struct irb));
48 /* Try on every path. */
50 while (cdev->private->imask != 0) {
51 /* Try every path multiple times. */
52 if (cdev->private->iretry > 0) {
53 cdev->private->iretry--;
54 ret = cio_start (sch, cdev->private->iccws,
55 cdev->private->imask);
56 /* ret is 0, -EBUSY, -EACCES or -ENODEV */
59 CIO_MSG_EVENT(2, "SNID - Device %04x on Subchannel "
60 "%04x, lpm %02X, became 'not "
62 cdev->private->devno, sch->irq,
63 cdev->private->imask);
66 cdev->private->imask >>= 1;
67 cdev->private->iretry = 5;
73 ccw_device_sense_pgid_start(struct ccw_device *cdev)
77 cdev->private->state = DEV_STATE_SENSE_PGID;
78 cdev->private->imask = 0x80;
79 cdev->private->iretry = 5;
80 memset (&cdev->private->pgid, 0, sizeof (struct pgid));
81 ret = __ccw_device_sense_pgid_start(cdev);
82 if (ret && ret != -EBUSY)
83 ccw_device_sense_pgid_done(cdev, ret);
87 * Called from interrupt context to check if a valid answer
88 * to Sense Path Group ID was received.
91 __ccw_device_check_sense_pgid(struct ccw_device *cdev)
93 struct subchannel *sch;
96 sch = to_subchannel(cdev->dev.parent);
97 irb = &cdev->private->irb;
98 if (irb->scsw.fctl & (SCSW_FCTL_HALT_FUNC | SCSW_FCTL_CLEAR_FUNC))
100 if (irb->esw.esw0.erw.cons &&
101 (irb->ecw[0]&(SNS0_CMD_REJECT|SNS0_INTERVENTION_REQ))) {
103 * If the device doesn't support the Sense Path Group ID
104 * command further retries wouldn't help ...
108 if (irb->esw.esw0.erw.cons) {
109 CIO_MSG_EVENT(2, "SNID - device %04x, unit check, "
110 "lpum %02X, cnt %02d, sns : "
111 "%02X%02X%02X%02X %02X%02X%02X%02X ...\n",
112 cdev->private->devno,
113 irb->esw.esw0.sublog.lpum,
114 irb->esw.esw0.erw.scnt,
115 irb->ecw[0], irb->ecw[1],
116 irb->ecw[2], irb->ecw[3],
117 irb->ecw[4], irb->ecw[5],
118 irb->ecw[6], irb->ecw[7]);
121 if (irb->scsw.cc == 3) {
122 CIO_MSG_EVENT(2, "SNID - Device %04x on Subchannel "
123 "%04x, lpm %02X, became 'not operational'\n",
124 cdev->private->devno, sch->irq, sch->orb.lpm);
127 if (cdev->private->pgid.inf.ps.state2 == SNID_STATE2_RESVD_ELSE) {
128 CIO_MSG_EVENT(2, "SNID - Device %04x on Subchannel %04x "
129 "is reserved by someone else\n",
130 cdev->private->devno, sch->irq);
137 * Got interrupt for Sense Path Group ID.
140 ccw_device_sense_pgid_irq(struct ccw_device *cdev, enum dev_event dev_event)
142 struct subchannel *sch;
146 irb = (struct irb *) __LC_IRB;
147 /* Retry sense pgid for cc=1. */
148 if (irb->scsw.stctl ==
149 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
150 if (irb->scsw.cc == 1) {
151 ret = __ccw_device_sense_pgid_start(cdev);
152 if (ret && ret != -EBUSY)
153 ccw_device_sense_pgid_done(cdev, ret);
157 if (ccw_device_accumulate_and_sense(cdev, irb) != 0)
159 sch = to_subchannel(cdev->dev.parent);
160 ret = __ccw_device_check_sense_pgid(cdev);
161 memset(&cdev->private->irb, 0, sizeof(struct irb));
163 /* 0, -ETIME, -EOPNOTSUPP, -EAGAIN, -EACCES or -EUSERS */
164 case 0: /* Sense Path Group ID successful. */
165 if (cdev->private->pgid.inf.ps.state1 == SNID_STATE1_RESET)
166 memcpy(&cdev->private->pgid, &global_pgid,
167 sizeof(struct pgid));
168 ccw_device_sense_pgid_done(cdev, 0);
170 case -EOPNOTSUPP: /* Sense Path Group ID not supported */
171 ccw_device_sense_pgid_done(cdev, -EOPNOTSUPP);
173 case -ETIME: /* Sense path group id stopped by timeout. */
174 ccw_device_sense_pgid_done(cdev, -ETIME);
176 case -EACCES: /* channel is not operational. */
177 sch->lpm &= ~cdev->private->imask;
178 cdev->private->imask >>= 1;
179 cdev->private->iretry = 5;
181 case -EAGAIN: /* Try again. */
182 ret = __ccw_device_sense_pgid_start(cdev);
183 if (ret != 0 && ret != -EBUSY)
184 ccw_device_sense_pgid_done(cdev, -ENODEV);
186 case -EUSERS: /* device is reserved for someone else. */
187 ccw_device_sense_pgid_done(cdev, -EUSERS);
193 * Path Group ID helper function.
196 __ccw_device_do_pgid(struct ccw_device *cdev, __u8 func)
198 struct subchannel *sch;
202 sch = to_subchannel(cdev->dev.parent);
204 /* Setup sense path group id channel program. */
205 cdev->private->pgid.inf.fc = func;
206 ccw = cdev->private->iccws;
207 if (!cdev->private->flags.pgid_single) {
208 cdev->private->pgid.inf.fc |= SPID_FUNC_MULTI_PATH;
209 ccw->cmd_code = CCW_CMD_SUSPEND_RECONN;
212 ccw->flags = CCW_FLAG_SLI | CCW_FLAG_CC;
215 cdev->private->pgid.inf.fc |= SPID_FUNC_SINGLE_PATH;
217 ccw->cmd_code = CCW_CMD_SET_PGID;
218 ccw->cda = (__u32) __pa (&cdev->private->pgid);
219 ccw->count = sizeof (struct pgid);
220 ccw->flags = CCW_FLAG_SLI;
222 /* Reset device status. */
223 memset(&cdev->private->irb, 0, sizeof(struct irb));
225 /* Try multiple times. */
227 if (cdev->private->iretry > 0) {
228 cdev->private->iretry--;
229 ret = cio_start (sch, cdev->private->iccws,
230 cdev->private->imask);
231 /* ret is 0, -EBUSY, -EACCES or -ENODEV */
232 if ((ret != -EACCES) && (ret != -ENODEV))
235 /* PGID command failed on this path. Switch it off. */
236 sch->lpm &= ~cdev->private->imask;
237 sch->vpm &= ~cdev->private->imask;
238 CIO_MSG_EVENT(2, "SPID - Device %04x on Subchannel "
239 "%04x, lpm %02X, became 'not operational'\n",
240 cdev->private->devno, sch->irq, cdev->private->imask);
245 * Called from interrupt context to check if a valid answer
246 * to Set Path Group ID was received.
249 __ccw_device_check_pgid(struct ccw_device *cdev)
251 struct subchannel *sch;
254 sch = to_subchannel(cdev->dev.parent);
255 irb = &cdev->private->irb;
256 if (irb->scsw.fctl & (SCSW_FCTL_HALT_FUNC | SCSW_FCTL_CLEAR_FUNC))
258 if (irb->esw.esw0.erw.cons) {
259 if (irb->ecw[0] & SNS0_CMD_REJECT)
261 /* Hmm, whatever happened, try again. */
262 CIO_MSG_EVENT(2, "SPID - device %04x, unit check, cnt %02d, "
263 "sns : %02X%02X%02X%02X %02X%02X%02X%02X ...\n",
264 cdev->private->devno, irb->esw.esw0.erw.scnt,
265 irb->ecw[0], irb->ecw[1],
266 irb->ecw[2], irb->ecw[3],
267 irb->ecw[4], irb->ecw[5],
268 irb->ecw[6], irb->ecw[7]);
271 if (irb->scsw.cc == 3) {
272 CIO_MSG_EVENT(2, "SPID - Device %04x on Subchannel "
273 "%04x, lpm %02X, became 'not operational'\n",
274 cdev->private->devno, sch->irq,
275 cdev->private->imask);
282 __ccw_device_verify_start(struct ccw_device *cdev)
284 struct subchannel *sch;
288 sch = to_subchannel(cdev->dev.parent);
289 while (sch->vpm != sch->lpm) {
290 /* Find first unequal bit in vpm vs. lpm */
291 for (imask = 0x80; imask != 0; imask >>= 1)
292 if ((sch->vpm & imask) != (sch->lpm & imask))
294 cdev->private->imask = imask;
295 func = (sch->vpm & imask) ?
296 SPID_FUNC_RESIGN : SPID_FUNC_ESTABLISH;
297 ret = __ccw_device_do_pgid(cdev, func);
298 if (ret == 0 || ret == -EBUSY)
300 cdev->private->iretry = 5;
302 ccw_device_verify_done(cdev, (sch->lpm != 0) ? 0 : -ENODEV);
306 * Got interrupt for Set Path Group ID.
309 ccw_device_verify_irq(struct ccw_device *cdev, enum dev_event dev_event)
311 struct subchannel *sch;
315 irb = (struct irb *) __LC_IRB;
316 /* Retry set pgid for cc=1. */
317 if (irb->scsw.stctl ==
318 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
319 if (irb->scsw.cc == 1)
320 __ccw_device_verify_start(cdev);
323 if (ccw_device_accumulate_and_sense(cdev, irb) != 0)
325 sch = to_subchannel(cdev->dev.parent);
326 ret = __ccw_device_check_pgid(cdev);
327 memset(&cdev->private->irb, 0, sizeof(struct irb));
329 /* 0, -ETIME, -EAGAIN, -EOPNOTSUPP or -EACCES */
331 /* Establish or Resign Path Group done. Update vpm. */
332 if ((sch->lpm & cdev->private->imask) != 0)
333 sch->vpm |= cdev->private->imask;
335 sch->vpm &= ~cdev->private->imask;
336 cdev->private->iretry = 5;
337 __ccw_device_verify_start(cdev);
341 * One of those strange devices which claim to be able
342 * to do multipathing but not for Set Path Group ID.
344 if (cdev->private->flags.pgid_single) {
345 ccw_device_verify_done(cdev, -EOPNOTSUPP);
348 cdev->private->flags.pgid_single = 1;
350 case -EAGAIN: /* Try again. */
351 __ccw_device_verify_start(cdev);
353 case -ETIME: /* Set path group id stopped by timeout. */
354 ccw_device_verify_done(cdev, -ETIME);
356 case -EACCES: /* channel is not operational. */
357 sch->lpm &= ~cdev->private->imask;
358 sch->vpm &= ~cdev->private->imask;
359 cdev->private->iretry = 5;
360 __ccw_device_verify_start(cdev);
366 ccw_device_verify_start(struct ccw_device *cdev)
368 struct subchannel *sch = to_subchannel(cdev->dev.parent);
370 cdev->private->flags.pgid_single = 0;
371 cdev->private->iretry = 5;
373 * Update sch->lpm with current values to catch paths becoming
376 if (stsch(sch->irq, &sch->schib)) {
377 ccw_device_verify_done(cdev, -ENODEV);
380 sch->lpm = sch->schib.pmcw.pim &
381 sch->schib.pmcw.pam &
382 sch->schib.pmcw.pom &
384 __ccw_device_verify_start(cdev);
388 __ccw_device_disband_start(struct ccw_device *cdev)
390 struct subchannel *sch;
393 sch = to_subchannel(cdev->dev.parent);
394 while (cdev->private->imask != 0) {
395 if (sch->lpm & cdev->private->imask) {
396 ret = __ccw_device_do_pgid(cdev, SPID_FUNC_DISBAND);
400 cdev->private->iretry = 5;
401 cdev->private->imask >>= 1;
403 ccw_device_verify_done(cdev, (sch->lpm != 0) ? 0 : -ENODEV);
407 * Got interrupt for Unset Path Group ID.
410 ccw_device_disband_irq(struct ccw_device *cdev, enum dev_event dev_event)
412 struct subchannel *sch;
416 irb = (struct irb *) __LC_IRB;
417 /* Retry set pgid for cc=1. */
418 if (irb->scsw.stctl ==
419 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
420 if (irb->scsw.cc == 1)
421 __ccw_device_disband_start(cdev);
424 if (ccw_device_accumulate_and_sense(cdev, irb) != 0)
426 sch = to_subchannel(cdev->dev.parent);
427 ret = __ccw_device_check_pgid(cdev);
428 memset(&cdev->private->irb, 0, sizeof(struct irb));
430 /* 0, -ETIME, -EAGAIN, -EOPNOTSUPP or -EACCES */
431 case 0: /* disband successful. */
433 ccw_device_disband_done(cdev, ret);
437 * One of those strange devices which claim to be able
438 * to do multipathing but not for Unset Path Group ID.
440 cdev->private->flags.pgid_single = 1;
442 case -EAGAIN: /* Try again. */
443 __ccw_device_disband_start(cdev);
445 case -ETIME: /* Set path group id stopped by timeout. */
446 ccw_device_disband_done(cdev, -ETIME);
448 case -EACCES: /* channel is not operational. */
449 cdev->private->imask >>= 1;
450 cdev->private->iretry = 5;
451 __ccw_device_disband_start(cdev);
457 ccw_device_disband_start(struct ccw_device *cdev)
459 cdev->private->flags.pgid_single = 0;
460 cdev->private->iretry = 5;
461 cdev->private->imask = 0x80;
462 __ccw_device_disband_start(cdev);