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600 lines
16 KiB
600 lines
16 KiB
/*
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* drivers/s390/cio/device_pgid.c
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*
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* Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
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* IBM Corporation
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* Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
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* Martin Schwidefsky (schwidefsky@de.ibm.com)
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*
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* Path Group ID functions.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <asm/ccwdev.h>
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#include <asm/cio.h>
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#include <asm/delay.h>
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#include <asm/lowcore.h>
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#include "cio.h"
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#include "cio_debug.h"
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#include "css.h"
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#include "device.h"
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#include "ioasm.h"
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#include "io_sch.h"
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/*
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* Helper function called from interrupt context to decide whether an
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* operation should be tried again.
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*/
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static int __ccw_device_should_retry(struct scsw *scsw)
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{
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/* CC is only valid if start function bit is set. */
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if ((scsw->fctl & SCSW_FCTL_START_FUNC) && scsw->cc == 1)
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return 1;
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/* No more activity. For sense and set PGID we stubbornly try again. */
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if (!scsw->actl)
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return 1;
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return 0;
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}
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/*
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* Start Sense Path Group ID helper function. Used in ccw_device_recog
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* and ccw_device_sense_pgid.
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*/
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static int
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__ccw_device_sense_pgid_start(struct ccw_device *cdev)
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{
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struct subchannel *sch;
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struct ccw1 *ccw;
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int ret;
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int i;
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sch = to_subchannel(cdev->dev.parent);
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/* Return if we already checked on all paths. */
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if (cdev->private->imask == 0)
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return (sch->lpm == 0) ? -ENODEV : -EACCES;
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i = 8 - ffs(cdev->private->imask);
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/* Setup sense path group id channel program. */
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ccw = cdev->private->iccws;
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ccw->cmd_code = CCW_CMD_SENSE_PGID;
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ccw->count = sizeof (struct pgid);
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ccw->flags = CCW_FLAG_SLI;
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/* Reset device status. */
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memset(&cdev->private->irb, 0, sizeof(struct irb));
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/* Try on every path. */
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ret = -ENODEV;
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while (cdev->private->imask != 0) {
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/* Try every path multiple times. */
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ccw->cda = (__u32) __pa (&cdev->private->pgid[i]);
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if (cdev->private->iretry > 0) {
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cdev->private->iretry--;
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/* Reset internal retry indication. */
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cdev->private->flags.intretry = 0;
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ret = cio_start (sch, cdev->private->iccws,
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cdev->private->imask);
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/* ret is 0, -EBUSY, -EACCES or -ENODEV */
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if (ret != -EACCES)
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return ret;
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CIO_MSG_EVENT(2, "SNID - Device %04x on Subchannel "
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"0.%x.%04x, lpm %02X, became 'not "
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"operational'\n",
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cdev->private->dev_id.devno,
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sch->schid.ssid,
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sch->schid.sch_no, cdev->private->imask);
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}
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cdev->private->imask >>= 1;
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cdev->private->iretry = 5;
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i++;
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}
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return ret;
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}
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void
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ccw_device_sense_pgid_start(struct ccw_device *cdev)
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{
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int ret;
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/* Set a timeout of 60s */
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ccw_device_set_timeout(cdev, 60*HZ);
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cdev->private->state = DEV_STATE_SENSE_PGID;
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cdev->private->imask = 0x80;
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cdev->private->iretry = 5;
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memset (&cdev->private->pgid, 0, sizeof (cdev->private->pgid));
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ret = __ccw_device_sense_pgid_start(cdev);
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if (ret && ret != -EBUSY)
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ccw_device_sense_pgid_done(cdev, ret);
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}
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/*
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* Called from interrupt context to check if a valid answer
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* to Sense Path Group ID was received.
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*/
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static int
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__ccw_device_check_sense_pgid(struct ccw_device *cdev)
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{
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struct subchannel *sch;
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struct irb *irb;
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int i;
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sch = to_subchannel(cdev->dev.parent);
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irb = &cdev->private->irb;
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if (irb->scsw.fctl & (SCSW_FCTL_HALT_FUNC | SCSW_FCTL_CLEAR_FUNC)) {
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/* Retry Sense PGID if requested. */
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if (cdev->private->flags.intretry) {
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cdev->private->flags.intretry = 0;
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return -EAGAIN;
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}
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return -ETIME;
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}
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if (irb->esw.esw0.erw.cons &&
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(irb->ecw[0]&(SNS0_CMD_REJECT|SNS0_INTERVENTION_REQ))) {
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/*
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* If the device doesn't support the Sense Path Group ID
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* command further retries wouldn't help ...
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*/
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return -EOPNOTSUPP;
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}
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if (irb->esw.esw0.erw.cons) {
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CIO_MSG_EVENT(2, "SNID - device 0.%x.%04x, unit check, "
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"lpum %02X, cnt %02d, sns : "
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"%02X%02X%02X%02X %02X%02X%02X%02X ...\n",
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cdev->private->dev_id.ssid,
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cdev->private->dev_id.devno,
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irb->esw.esw0.sublog.lpum,
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irb->esw.esw0.erw.scnt,
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irb->ecw[0], irb->ecw[1],
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irb->ecw[2], irb->ecw[3],
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irb->ecw[4], irb->ecw[5],
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irb->ecw[6], irb->ecw[7]);
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return -EAGAIN;
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}
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if (irb->scsw.cc == 3) {
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u8 lpm;
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lpm = to_io_private(sch)->orb.lpm;
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CIO_MSG_EVENT(2, "SNID - Device %04x on Subchannel 0.%x.%04x,"
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" lpm %02X, became 'not operational'\n",
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cdev->private->dev_id.devno, sch->schid.ssid,
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sch->schid.sch_no, lpm);
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return -EACCES;
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}
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i = 8 - ffs(cdev->private->imask);
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if (cdev->private->pgid[i].inf.ps.state2 == SNID_STATE2_RESVD_ELSE) {
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CIO_MSG_EVENT(2, "SNID - Device %04x on Subchannel 0.%x.%04x "
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"is reserved by someone else\n",
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cdev->private->dev_id.devno, sch->schid.ssid,
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sch->schid.sch_no);
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return -EUSERS;
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}
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return 0;
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}
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/*
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* Got interrupt for Sense Path Group ID.
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*/
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void
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ccw_device_sense_pgid_irq(struct ccw_device *cdev, enum dev_event dev_event)
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{
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struct subchannel *sch;
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struct irb *irb;
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int ret;
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irb = (struct irb *) __LC_IRB;
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if (irb->scsw.stctl ==
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(SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
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if (__ccw_device_should_retry(&irb->scsw)) {
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ret = __ccw_device_sense_pgid_start(cdev);
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if (ret && ret != -EBUSY)
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ccw_device_sense_pgid_done(cdev, ret);
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}
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return;
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}
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if (ccw_device_accumulate_and_sense(cdev, irb) != 0)
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return;
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sch = to_subchannel(cdev->dev.parent);
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ret = __ccw_device_check_sense_pgid(cdev);
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memset(&cdev->private->irb, 0, sizeof(struct irb));
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switch (ret) {
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/* 0, -ETIME, -EOPNOTSUPP, -EAGAIN, -EACCES or -EUSERS */
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case -EOPNOTSUPP: /* Sense Path Group ID not supported */
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ccw_device_sense_pgid_done(cdev, -EOPNOTSUPP);
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break;
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case -ETIME: /* Sense path group id stopped by timeout. */
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ccw_device_sense_pgid_done(cdev, -ETIME);
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break;
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case -EACCES: /* channel is not operational. */
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sch->lpm &= ~cdev->private->imask;
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/* Fall through. */
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case 0: /* Sense Path Group ID successful. */
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cdev->private->imask >>= 1;
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cdev->private->iretry = 5;
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/* Fall through. */
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case -EAGAIN: /* Try again. */
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ret = __ccw_device_sense_pgid_start(cdev);
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if (ret != 0 && ret != -EBUSY)
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ccw_device_sense_pgid_done(cdev, ret);
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break;
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case -EUSERS: /* device is reserved for someone else. */
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ccw_device_sense_pgid_done(cdev, -EUSERS);
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break;
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}
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}
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/*
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* Path Group ID helper function.
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*/
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static int
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__ccw_device_do_pgid(struct ccw_device *cdev, __u8 func)
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{
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struct subchannel *sch;
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struct ccw1 *ccw;
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int ret;
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sch = to_subchannel(cdev->dev.parent);
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/* Setup sense path group id channel program. */
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cdev->private->pgid[0].inf.fc = func;
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ccw = cdev->private->iccws;
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if (!cdev->private->flags.pgid_single) {
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cdev->private->pgid[0].inf.fc |= SPID_FUNC_MULTI_PATH;
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ccw->cmd_code = CCW_CMD_SUSPEND_RECONN;
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ccw->cda = 0;
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ccw->count = 0;
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ccw->flags = CCW_FLAG_SLI | CCW_FLAG_CC;
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ccw++;
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} else
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cdev->private->pgid[0].inf.fc |= SPID_FUNC_SINGLE_PATH;
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ccw->cmd_code = CCW_CMD_SET_PGID;
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ccw->cda = (__u32) __pa (&cdev->private->pgid[0]);
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ccw->count = sizeof (struct pgid);
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ccw->flags = CCW_FLAG_SLI;
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/* Reset device status. */
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memset(&cdev->private->irb, 0, sizeof(struct irb));
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/* Try multiple times. */
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ret = -EACCES;
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if (cdev->private->iretry > 0) {
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cdev->private->iretry--;
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/* Reset internal retry indication. */
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cdev->private->flags.intretry = 0;
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ret = cio_start (sch, cdev->private->iccws,
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cdev->private->imask);
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/* We expect an interrupt in case of success or busy
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* indication. */
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if ((ret == 0) || (ret == -EBUSY))
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return ret;
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}
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/* PGID command failed on this path. */
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CIO_MSG_EVENT(2, "SPID - Device %04x on Subchannel "
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"0.%x.%04x, lpm %02X, became 'not operational'\n",
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cdev->private->dev_id.devno, sch->schid.ssid,
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sch->schid.sch_no, cdev->private->imask);
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return ret;
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}
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/*
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* Helper function to send a nop ccw down a path.
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*/
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static int __ccw_device_do_nop(struct ccw_device *cdev)
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{
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struct subchannel *sch;
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struct ccw1 *ccw;
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int ret;
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sch = to_subchannel(cdev->dev.parent);
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/* Setup nop channel program. */
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ccw = cdev->private->iccws;
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ccw->cmd_code = CCW_CMD_NOOP;
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ccw->cda = 0;
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ccw->count = 0;
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ccw->flags = CCW_FLAG_SLI;
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/* Reset device status. */
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memset(&cdev->private->irb, 0, sizeof(struct irb));
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/* Try multiple times. */
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ret = -EACCES;
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if (cdev->private->iretry > 0) {
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cdev->private->iretry--;
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/* Reset internal retry indication. */
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cdev->private->flags.intretry = 0;
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ret = cio_start (sch, cdev->private->iccws,
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cdev->private->imask);
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/* We expect an interrupt in case of success or busy
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* indication. */
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if ((ret == 0) || (ret == -EBUSY))
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return ret;
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}
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/* nop command failed on this path. */
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CIO_MSG_EVENT(2, "NOP - Device %04x on Subchannel "
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"0.%x.%04x, lpm %02X, became 'not operational'\n",
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cdev->private->dev_id.devno, sch->schid.ssid,
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sch->schid.sch_no, cdev->private->imask);
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return ret;
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}
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/*
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* Called from interrupt context to check if a valid answer
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* to Set Path Group ID was received.
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*/
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static int
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__ccw_device_check_pgid(struct ccw_device *cdev)
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{
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struct subchannel *sch;
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struct irb *irb;
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sch = to_subchannel(cdev->dev.parent);
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irb = &cdev->private->irb;
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if (irb->scsw.fctl & (SCSW_FCTL_HALT_FUNC | SCSW_FCTL_CLEAR_FUNC)) {
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/* Retry Set PGID if requested. */
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if (cdev->private->flags.intretry) {
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cdev->private->flags.intretry = 0;
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return -EAGAIN;
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}
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return -ETIME;
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}
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if (irb->esw.esw0.erw.cons) {
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if (irb->ecw[0] & SNS0_CMD_REJECT)
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return -EOPNOTSUPP;
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/* Hmm, whatever happened, try again. */
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CIO_MSG_EVENT(2, "SPID - device 0.%x.%04x, unit check, "
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"cnt %02d, "
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"sns : %02X%02X%02X%02X %02X%02X%02X%02X ...\n",
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cdev->private->dev_id.ssid,
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cdev->private->dev_id.devno,
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irb->esw.esw0.erw.scnt,
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irb->ecw[0], irb->ecw[1],
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irb->ecw[2], irb->ecw[3],
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irb->ecw[4], irb->ecw[5],
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irb->ecw[6], irb->ecw[7]);
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return -EAGAIN;
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}
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if (irb->scsw.cc == 3) {
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CIO_MSG_EVENT(2, "SPID - Device %04x on Subchannel 0.%x.%04x,"
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" lpm %02X, became 'not operational'\n",
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cdev->private->dev_id.devno, sch->schid.ssid,
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sch->schid.sch_no, cdev->private->imask);
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return -EACCES;
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}
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return 0;
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}
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/*
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* Called from interrupt context to check the path status after a nop has
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* been send.
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*/
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static int __ccw_device_check_nop(struct ccw_device *cdev)
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{
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struct subchannel *sch;
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struct irb *irb;
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sch = to_subchannel(cdev->dev.parent);
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irb = &cdev->private->irb;
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if (irb->scsw.fctl & (SCSW_FCTL_HALT_FUNC | SCSW_FCTL_CLEAR_FUNC)) {
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/* Retry NOP if requested. */
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if (cdev->private->flags.intretry) {
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cdev->private->flags.intretry = 0;
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return -EAGAIN;
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}
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return -ETIME;
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}
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if (irb->scsw.cc == 3) {
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CIO_MSG_EVENT(2, "NOP - Device %04x on Subchannel 0.%x.%04x,"
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" lpm %02X, became 'not operational'\n",
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cdev->private->dev_id.devno, sch->schid.ssid,
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sch->schid.sch_no, cdev->private->imask);
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return -EACCES;
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}
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return 0;
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}
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static void
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__ccw_device_verify_start(struct ccw_device *cdev)
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{
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struct subchannel *sch;
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__u8 func;
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int ret;
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sch = to_subchannel(cdev->dev.parent);
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/* Repeat for all paths. */
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for (; cdev->private->imask; cdev->private->imask >>= 1,
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cdev->private->iretry = 5) {
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if ((cdev->private->imask & sch->schib.pmcw.pam) == 0)
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/* Path not available, try next. */
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continue;
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if (cdev->private->options.pgroup) {
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if (sch->opm & cdev->private->imask)
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func = SPID_FUNC_ESTABLISH;
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else
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func = SPID_FUNC_RESIGN;
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ret = __ccw_device_do_pgid(cdev, func);
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} else
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ret = __ccw_device_do_nop(cdev);
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/* We expect an interrupt in case of success or busy
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* indication. */
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if (ret == 0 || ret == -EBUSY)
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return;
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/* Permanent path failure, try next. */
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}
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/* Done with all paths. */
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ccw_device_verify_done(cdev, (sch->vpm != 0) ? 0 : -ENODEV);
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}
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/*
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* Got interrupt for Set Path Group ID.
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*/
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void
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ccw_device_verify_irq(struct ccw_device *cdev, enum dev_event dev_event)
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{
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struct subchannel *sch;
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struct irb *irb;
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int ret;
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irb = (struct irb *) __LC_IRB;
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if (irb->scsw.stctl ==
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(SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
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if (__ccw_device_should_retry(&irb->scsw))
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__ccw_device_verify_start(cdev);
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return;
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}
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if (ccw_device_accumulate_and_sense(cdev, irb) != 0)
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return;
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sch = to_subchannel(cdev->dev.parent);
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if (cdev->private->options.pgroup)
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ret = __ccw_device_check_pgid(cdev);
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else
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ret = __ccw_device_check_nop(cdev);
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memset(&cdev->private->irb, 0, sizeof(struct irb));
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switch (ret) {
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/* 0, -ETIME, -EAGAIN, -EOPNOTSUPP or -EACCES */
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case 0:
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/* Path verification ccw finished successfully, update lpm. */
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sch->vpm |= sch->opm & cdev->private->imask;
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/* Go on with next path. */
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|
cdev->private->imask >>= 1;
|
|
cdev->private->iretry = 5;
|
|
__ccw_device_verify_start(cdev);
|
|
break;
|
|
case -EOPNOTSUPP:
|
|
/*
|
|
* One of those strange devices which claim to be able
|
|
* to do multipathing but not for Set Path Group ID.
|
|
*/
|
|
if (cdev->private->flags.pgid_single)
|
|
cdev->private->options.pgroup = 0;
|
|
else
|
|
cdev->private->flags.pgid_single = 1;
|
|
/* Retry */
|
|
sch->vpm = 0;
|
|
cdev->private->imask = 0x80;
|
|
cdev->private->iretry = 5;
|
|
/* fall through. */
|
|
case -EAGAIN: /* Try again. */
|
|
__ccw_device_verify_start(cdev);
|
|
break;
|
|
case -ETIME: /* Set path group id stopped by timeout. */
|
|
ccw_device_verify_done(cdev, -ETIME);
|
|
break;
|
|
case -EACCES: /* channel is not operational. */
|
|
cdev->private->imask >>= 1;
|
|
cdev->private->iretry = 5;
|
|
__ccw_device_verify_start(cdev);
|
|
break;
|
|
}
|
|
}
|
|
|
|
void
|
|
ccw_device_verify_start(struct ccw_device *cdev)
|
|
{
|
|
struct subchannel *sch = to_subchannel(cdev->dev.parent);
|
|
|
|
cdev->private->flags.pgid_single = 0;
|
|
cdev->private->imask = 0x80;
|
|
cdev->private->iretry = 5;
|
|
|
|
/* Start with empty vpm. */
|
|
sch->vpm = 0;
|
|
|
|
/* Get current pam. */
|
|
if (stsch(sch->schid, &sch->schib)) {
|
|
ccw_device_verify_done(cdev, -ENODEV);
|
|
return;
|
|
}
|
|
/* After 60s path verification is considered to have failed. */
|
|
ccw_device_set_timeout(cdev, 60*HZ);
|
|
__ccw_device_verify_start(cdev);
|
|
}
|
|
|
|
static void
|
|
__ccw_device_disband_start(struct ccw_device *cdev)
|
|
{
|
|
struct subchannel *sch;
|
|
int ret;
|
|
|
|
sch = to_subchannel(cdev->dev.parent);
|
|
while (cdev->private->imask != 0) {
|
|
if (sch->lpm & cdev->private->imask) {
|
|
ret = __ccw_device_do_pgid(cdev, SPID_FUNC_DISBAND);
|
|
if (ret == 0)
|
|
return;
|
|
}
|
|
cdev->private->iretry = 5;
|
|
cdev->private->imask >>= 1;
|
|
}
|
|
ccw_device_disband_done(cdev, (sch->lpm != 0) ? 0 : -ENODEV);
|
|
}
|
|
|
|
/*
|
|
* Got interrupt for Unset Path Group ID.
|
|
*/
|
|
void
|
|
ccw_device_disband_irq(struct ccw_device *cdev, enum dev_event dev_event)
|
|
{
|
|
struct subchannel *sch;
|
|
struct irb *irb;
|
|
int ret;
|
|
|
|
irb = (struct irb *) __LC_IRB;
|
|
|
|
if (irb->scsw.stctl ==
|
|
(SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
|
|
if (__ccw_device_should_retry(&irb->scsw))
|
|
__ccw_device_disband_start(cdev);
|
|
return;
|
|
}
|
|
if (ccw_device_accumulate_and_sense(cdev, irb) != 0)
|
|
return;
|
|
sch = to_subchannel(cdev->dev.parent);
|
|
ret = __ccw_device_check_pgid(cdev);
|
|
memset(&cdev->private->irb, 0, sizeof(struct irb));
|
|
switch (ret) {
|
|
/* 0, -ETIME, -EAGAIN, -EOPNOTSUPP or -EACCES */
|
|
case 0: /* disband successful. */
|
|
ccw_device_disband_done(cdev, ret);
|
|
break;
|
|
case -EOPNOTSUPP:
|
|
/*
|
|
* One of those strange devices which claim to be able
|
|
* to do multipathing but not for Unset Path Group ID.
|
|
*/
|
|
cdev->private->flags.pgid_single = 1;
|
|
/* fall through. */
|
|
case -EAGAIN: /* Try again. */
|
|
__ccw_device_disband_start(cdev);
|
|
break;
|
|
case -ETIME: /* Set path group id stopped by timeout. */
|
|
ccw_device_disband_done(cdev, -ETIME);
|
|
break;
|
|
case -EACCES: /* channel is not operational. */
|
|
cdev->private->imask >>= 1;
|
|
cdev->private->iretry = 5;
|
|
__ccw_device_disband_start(cdev);
|
|
break;
|
|
}
|
|
}
|
|
|
|
void
|
|
ccw_device_disband_start(struct ccw_device *cdev)
|
|
{
|
|
/* After 60s disbanding is considered to have failed. */
|
|
ccw_device_set_timeout(cdev, 60*HZ);
|
|
|
|
cdev->private->flags.pgid_single = 0;
|
|
cdev->private->iretry = 5;
|
|
cdev->private->imask = 0x80;
|
|
__ccw_device_disband_start(cdev);
|
|
}
|
|
|