forked from luck/tmp_suning_uos_patched
23d805b647
Extend the scsw data structure to the format required by fcx. Also provide helper functions for easier access to fields which are present in both the traditional as well as the modified format. Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
595 lines
16 KiB
C
595 lines
16 KiB
C
/*
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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(union 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->cmd.fctl & SCSW_FCTL_START_FUNC) && scsw->cmd.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->cmd.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(3, "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.cmd.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.cmd.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(3, "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.cmd.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_SINGLE_PATH;
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else
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cdev->private->pgid[0].inf.fc |= SPID_FUNC_MULTI_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(3, "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(3, "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.cmd.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.cmd.cc == 3) {
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CIO_MSG_EVENT(3, "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.cmd.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.cmd.cc == 3) {
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CIO_MSG_EVENT(3, "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.cmd.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. */
|
|
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.cmd.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);
|
|
}
|