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"
27 * Start Sense Path Group ID helper function. Used in ccw_device_recog
28 * and ccw_device_sense_pgid.
31 __ccw_device_sense_pgid_start(struct ccw_device *cdev)
33 struct subchannel *sch;
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;
45 /* Reset device status. */
46 memset(&cdev->private->irb, 0, sizeof(struct irb));
47 /* Try on every path. */
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 */
58 CIO_MSG_EVENT(2, "SNID - Device %04x on Subchannel "
59 "%04x, lpm %02X, became 'not "
61 cdev->private->devno, sch->irq,
62 cdev->private->imask);
65 cdev->private->imask >>= 1;
66 cdev->private->iretry = 5;
72 ccw_device_sense_pgid_start(struct ccw_device *cdev)
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);
86 * Called from interrupt context to check if a valid answer
87 * to Sense Path Group ID was received.
90 __ccw_device_check_sense_pgid(struct ccw_device *cdev)
92 struct subchannel *sch;
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))
99 if (irb->esw.esw0.erw.cons &&
100 (irb->ecw[0]&(SNS0_CMD_REJECT|SNS0_INTERVENTION_REQ))) {
102 * If the device doesn't support the Sense Path Group ID
103 * command further retries wouldn't help ...
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]);
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);
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);
136 * Got interrupt for Sense Path Group ID.
139 ccw_device_sense_pgid_irq(struct ccw_device *cdev, enum dev_event dev_event)
141 struct subchannel *sch;
145 irb = (struct irb *) __LC_IRB;
147 * Unsolicited interrupts may pertain to an earlier status pending or
148 * busy condition on the subchannel. Retry sense pgid.
150 if (irb->scsw.stctl ==
151 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
152 ret = __ccw_device_sense_pgid_start(cdev);
153 if (ret && ret != -EBUSY)
154 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 switch (__ccw_device_check_sense_pgid(cdev)) {
161 /* 0, -ETIME, -EOPNOTSUPP, -EAGAIN, -EACCES or -EUSERS */
162 case 0: /* Sense Path Group ID successful. */
163 if (cdev->private->pgid.inf.ps.state1 == SNID_STATE1_RESET)
164 memcpy(&cdev->private->pgid, &global_pgid,
165 sizeof(struct pgid));
166 ccw_device_sense_pgid_done(cdev, 0);
168 case -EOPNOTSUPP: /* Sense Path Group ID not supported */
169 ccw_device_sense_pgid_done(cdev, -EOPNOTSUPP);
171 case -ETIME: /* Sense path group id stopped by timeout. */
172 ccw_device_sense_pgid_done(cdev, -ETIME);
174 case -EACCES: /* channel is not operational. */
175 sch->lpm &= ~cdev->private->imask;
176 cdev->private->imask >>= 1;
177 cdev->private->iretry = 5;
179 case -EAGAIN: /* Try again. */
180 ret = __ccw_device_sense_pgid_start(cdev);
181 if (ret != 0 && ret != -EBUSY)
182 ccw_device_sense_pgid_done(cdev, -ENODEV);
184 case -EUSERS: /* device is reserved for someone else. */
185 ccw_device_sense_pgid_done(cdev, -EUSERS);
191 * Path Group ID helper function.
194 __ccw_device_do_pgid(struct ccw_device *cdev, __u8 func)
196 struct subchannel *sch;
200 sch = to_subchannel(cdev->dev.parent);
202 /* Setup sense path group id channel program. */
203 cdev->private->pgid.inf.fc = func;
204 ccw = cdev->private->iccws;
205 if (!cdev->private->flags.pgid_single) {
206 cdev->private->pgid.inf.fc |= SPID_FUNC_MULTI_PATH;
207 ccw->cmd_code = CCW_CMD_SUSPEND_RECONN;
210 ccw->flags = CCW_FLAG_SLI | CCW_FLAG_CC;
213 cdev->private->pgid.inf.fc |= SPID_FUNC_SINGLE_PATH;
215 ccw->cmd_code = CCW_CMD_SET_PGID;
216 ccw->cda = (__u32) __pa (&cdev->private->pgid);
217 ccw->count = sizeof (struct pgid);
218 ccw->flags = CCW_FLAG_SLI;
220 /* Reset device status. */
221 memset(&cdev->private->irb, 0, sizeof(struct irb));
223 /* Try multiple times. */
225 if (cdev->private->iretry > 0) {
226 cdev->private->iretry--;
227 ret = cio_start (sch, cdev->private->iccws,
228 cdev->private->imask);
229 /* ret is 0, -EBUSY, -EACCES or -ENODEV */
230 if ((ret != -EACCES) && (ret != -ENODEV))
233 /* PGID command failed on this path. Switch it off. */
234 sch->lpm &= ~cdev->private->imask;
235 sch->vpm &= ~cdev->private->imask;
236 CIO_MSG_EVENT(2, "SPID - Device %04x on Subchannel "
237 "%04x, lpm %02X, became 'not operational'\n",
238 cdev->private->devno, sch->irq, cdev->private->imask);
243 * Called from interrupt context to check if a valid answer
244 * to Set Path Group ID was received.
247 __ccw_device_check_pgid(struct ccw_device *cdev)
249 struct subchannel *sch;
252 sch = to_subchannel(cdev->dev.parent);
253 irb = &cdev->private->irb;
254 if (irb->scsw.fctl & (SCSW_FCTL_HALT_FUNC | SCSW_FCTL_CLEAR_FUNC))
256 if (irb->esw.esw0.erw.cons) {
257 if (irb->ecw[0] & SNS0_CMD_REJECT)
259 /* Hmm, whatever happened, try again. */
260 CIO_MSG_EVENT(2, "SPID - device %04x, unit check, cnt %02d, "
261 "sns : %02X%02X%02X%02X %02X%02X%02X%02X ...\n",
262 cdev->private->devno, irb->esw.esw0.erw.scnt,
263 irb->ecw[0], irb->ecw[1],
264 irb->ecw[2], irb->ecw[3],
265 irb->ecw[4], irb->ecw[5],
266 irb->ecw[6], irb->ecw[7]);
269 if (irb->scsw.cc == 3) {
270 CIO_MSG_EVENT(2, "SPID - Device %04x on Subchannel "
271 "%04x, lpm %02X, became 'not operational'\n",
272 cdev->private->devno, sch->irq,
273 cdev->private->imask);
280 __ccw_device_verify_start(struct ccw_device *cdev)
282 struct subchannel *sch;
286 sch = to_subchannel(cdev->dev.parent);
287 while (sch->vpm != sch->lpm) {
288 /* Find first unequal bit in vpm vs. lpm */
289 for (imask = 0x80; imask != 0; imask >>= 1)
290 if ((sch->vpm & imask) != (sch->lpm & imask))
292 cdev->private->imask = imask;
293 func = (sch->vpm & imask) ?
294 SPID_FUNC_RESIGN : SPID_FUNC_ESTABLISH;
295 ret = __ccw_device_do_pgid(cdev, func);
296 if (ret == 0 || ret == -EBUSY)
298 cdev->private->iretry = 5;
300 ccw_device_verify_done(cdev, (sch->lpm != 0) ? 0 : -ENODEV);
304 * Got interrupt for Set Path Group ID.
307 ccw_device_verify_irq(struct ccw_device *cdev, enum dev_event dev_event)
309 struct subchannel *sch;
312 irb = (struct irb *) __LC_IRB;
314 * Unsolicited interrupts may pertain to an earlier status pending or
315 * busy condition on the subchannel. Restart path verification.
317 if (irb->scsw.stctl ==
318 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
319 __ccw_device_verify_start(cdev);
322 if (ccw_device_accumulate_and_sense(cdev, irb) != 0)
324 sch = to_subchannel(cdev->dev.parent);
325 switch (__ccw_device_check_pgid(cdev)) {
326 /* 0, -ETIME, -EAGAIN, -EOPNOTSUPP or -EACCES */
328 /* Establish or Resign Path Group done. Update vpm. */
329 if ((sch->lpm & cdev->private->imask) != 0)
330 sch->vpm |= cdev->private->imask;
332 sch->vpm &= ~cdev->private->imask;
333 cdev->private->iretry = 5;
334 __ccw_device_verify_start(cdev);
338 * One of those strange devices which claim to be able
339 * to do multipathing but not for Set Path Group ID.
341 if (cdev->private->flags.pgid_single) {
342 ccw_device_verify_done(cdev, -EOPNOTSUPP);
345 cdev->private->flags.pgid_single = 1;
347 case -EAGAIN: /* Try again. */
348 __ccw_device_verify_start(cdev);
350 case -ETIME: /* Set path group id stopped by timeout. */
351 ccw_device_verify_done(cdev, -ETIME);
353 case -EACCES: /* channel is not operational. */
354 sch->lpm &= ~cdev->private->imask;
355 sch->vpm &= ~cdev->private->imask;
356 cdev->private->iretry = 5;
357 __ccw_device_verify_start(cdev);
363 ccw_device_verify_start(struct ccw_device *cdev)
365 cdev->private->flags.pgid_single = 0;
366 cdev->private->iretry = 5;
367 __ccw_device_verify_start(cdev);
371 __ccw_device_disband_start(struct ccw_device *cdev)
373 struct subchannel *sch;
376 sch = to_subchannel(cdev->dev.parent);
377 while (cdev->private->imask != 0) {
378 if (sch->lpm & cdev->private->imask) {
379 ret = __ccw_device_do_pgid(cdev, SPID_FUNC_DISBAND);
383 cdev->private->iretry = 5;
384 cdev->private->imask >>= 1;
386 ccw_device_verify_done(cdev, (sch->lpm != 0) ? 0 : -ENODEV);
390 * Got interrupt for Unset Path Group ID.
393 ccw_device_disband_irq(struct ccw_device *cdev, enum dev_event dev_event)
395 struct subchannel *sch;
399 irb = (struct irb *) __LC_IRB;
400 /* Ignore unsolicited interrupts. */
401 if (irb->scsw.stctl ==
402 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS))
404 if (ccw_device_accumulate_and_sense(cdev, irb) != 0)
406 sch = to_subchannel(cdev->dev.parent);
407 ret = __ccw_device_check_pgid(cdev);
409 /* 0, -ETIME, -EAGAIN, -EOPNOTSUPP or -EACCES */
410 case 0: /* disband successful. */
412 ccw_device_disband_done(cdev, ret);
416 * One of those strange devices which claim to be able
417 * to do multipathing but not for Unset Path Group ID.
419 cdev->private->flags.pgid_single = 1;
421 case -EAGAIN: /* Try again. */
422 __ccw_device_disband_start(cdev);
424 case -ETIME: /* Set path group id stopped by timeout. */
425 ccw_device_disband_done(cdev, -ETIME);
427 case -EACCES: /* channel is not operational. */
428 cdev->private->imask >>= 1;
429 cdev->private->iretry = 5;
430 __ccw_device_disband_start(cdev);
436 ccw_device_disband_start(struct ccw_device *cdev)
438 cdev->private->flags.pgid_single = 0;
439 cdev->private->iretry = 5;
440 cdev->private->imask = 0x80;
441 __ccw_device_disband_start(cdev);