400 lines
12 KiB
C
400 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright IBM Corp. 2002
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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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* Status accumulation and basic sense 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 "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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* Check for any kind of channel or interface control check but don't
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* issue the message for the console device
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*/
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static void
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ccw_device_msg_control_check(struct ccw_device *cdev, struct irb *irb)
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{
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struct subchannel *sch = to_subchannel(cdev->dev.parent);
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char dbf_text[15];
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if (!scsw_is_valid_cstat(&irb->scsw) ||
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!(scsw_cstat(&irb->scsw) & (SCHN_STAT_CHN_DATA_CHK |
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SCHN_STAT_CHN_CTRL_CHK | SCHN_STAT_INTF_CTRL_CHK)))
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return;
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CIO_MSG_EVENT(0, "Channel-Check or Interface-Control-Check "
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"received"
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" ... device %04x on subchannel 0.%x.%04x, dev_stat "
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": %02X sch_stat : %02X\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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scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw));
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sprintf(dbf_text, "chk%x", sch->schid.sch_no);
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CIO_TRACE_EVENT(0, dbf_text);
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CIO_HEX_EVENT(0, irb, sizeof(struct irb));
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}
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/*
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* Some paths became not operational (pno bit in scsw is set).
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*/
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static void
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ccw_device_path_notoper(struct ccw_device *cdev)
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{
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struct subchannel *sch;
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sch = to_subchannel(cdev->dev.parent);
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if (cio_update_schib(sch))
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goto doverify;
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CIO_MSG_EVENT(0, "%s(0.%x.%04x) - path(s) %02x are "
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"not operational \n", __func__,
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sch->schid.ssid, sch->schid.sch_no,
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sch->schib.pmcw.pnom);
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sch->lpm &= ~sch->schib.pmcw.pnom;
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doverify:
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cdev->private->flags.doverify = 1;
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}
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/*
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* Copy valid bits from the extended control word to device irb.
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*/
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static void
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ccw_device_accumulate_ecw(struct ccw_device *cdev, struct irb *irb)
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{
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/*
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* Copy extended control bit if it is valid... yes there
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* are condition that have to be met for the extended control
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* bit to have meaning. Sick.
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*/
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cdev->private->irb.scsw.cmd.ectl = 0;
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if ((irb->scsw.cmd.stctl & SCSW_STCTL_ALERT_STATUS) &&
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!(irb->scsw.cmd.stctl & SCSW_STCTL_INTER_STATUS))
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cdev->private->irb.scsw.cmd.ectl = irb->scsw.cmd.ectl;
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/* Check if extended control word is valid. */
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if (!cdev->private->irb.scsw.cmd.ectl)
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return;
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/* Copy concurrent sense / model dependent information. */
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memcpy (&cdev->private->irb.ecw, irb->ecw, sizeof (irb->ecw));
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}
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/*
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* Check if extended status word is valid.
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*/
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static int
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ccw_device_accumulate_esw_valid(struct irb *irb)
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{
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if (!irb->scsw.cmd.eswf &&
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(irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND))
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return 0;
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if (irb->scsw.cmd.stctl ==
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(SCSW_STCTL_INTER_STATUS|SCSW_STCTL_STATUS_PEND) &&
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!(irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED))
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return 0;
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return 1;
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}
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/*
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* Copy valid bits from the extended status word to device irb.
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*/
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static void
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ccw_device_accumulate_esw(struct ccw_device *cdev, struct irb *irb)
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{
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struct irb *cdev_irb;
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struct sublog *cdev_sublog, *sublog;
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if (!ccw_device_accumulate_esw_valid(irb))
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return;
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cdev_irb = &cdev->private->irb;
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/* Copy last path used mask. */
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cdev_irb->esw.esw1.lpum = irb->esw.esw1.lpum;
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/* Copy subchannel logout information if esw is of format 0. */
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if (irb->scsw.cmd.eswf) {
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cdev_sublog = &cdev_irb->esw.esw0.sublog;
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sublog = &irb->esw.esw0.sublog;
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/* Copy extended status flags. */
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cdev_sublog->esf = sublog->esf;
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/*
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* Copy fields that have a meaning for channel data check
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* channel control check and interface control check.
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*/
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if (irb->scsw.cmd.cstat & (SCHN_STAT_CHN_DATA_CHK |
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SCHN_STAT_CHN_CTRL_CHK |
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SCHN_STAT_INTF_CTRL_CHK)) {
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/* Copy ancillary report bit. */
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cdev_sublog->arep = sublog->arep;
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/* Copy field-validity-flags. */
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cdev_sublog->fvf = sublog->fvf;
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/* Copy storage access code. */
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cdev_sublog->sacc = sublog->sacc;
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/* Copy termination code. */
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cdev_sublog->termc = sublog->termc;
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/* Copy sequence code. */
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cdev_sublog->seqc = sublog->seqc;
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}
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/* Copy device status check. */
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cdev_sublog->devsc = sublog->devsc;
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/* Copy secondary error. */
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cdev_sublog->serr = sublog->serr;
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/* Copy i/o-error alert. */
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cdev_sublog->ioerr = sublog->ioerr;
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/* Copy channel path timeout bit. */
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if (irb->scsw.cmd.cstat & SCHN_STAT_INTF_CTRL_CHK)
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cdev_irb->esw.esw0.erw.cpt = irb->esw.esw0.erw.cpt;
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/* Copy failing storage address validity flag. */
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cdev_irb->esw.esw0.erw.fsavf = irb->esw.esw0.erw.fsavf;
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if (cdev_irb->esw.esw0.erw.fsavf) {
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/* ... and copy the failing storage address. */
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memcpy(cdev_irb->esw.esw0.faddr, irb->esw.esw0.faddr,
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sizeof (irb->esw.esw0.faddr));
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/* ... and copy the failing storage address format. */
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cdev_irb->esw.esw0.erw.fsaf = irb->esw.esw0.erw.fsaf;
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}
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/* Copy secondary ccw address validity bit. */
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cdev_irb->esw.esw0.erw.scavf = irb->esw.esw0.erw.scavf;
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if (irb->esw.esw0.erw.scavf)
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/* ... and copy the secondary ccw address. */
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cdev_irb->esw.esw0.saddr = irb->esw.esw0.saddr;
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}
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/* FIXME: DCTI for format 2? */
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/* Copy authorization bit. */
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cdev_irb->esw.esw0.erw.auth = irb->esw.esw0.erw.auth;
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/* Copy path verification required flag. */
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cdev_irb->esw.esw0.erw.pvrf = irb->esw.esw0.erw.pvrf;
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if (irb->esw.esw0.erw.pvrf)
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cdev->private->flags.doverify = 1;
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/* Copy concurrent sense bit. */
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cdev_irb->esw.esw0.erw.cons = irb->esw.esw0.erw.cons;
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if (irb->esw.esw0.erw.cons)
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cdev_irb->esw.esw0.erw.scnt = irb->esw.esw0.erw.scnt;
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}
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/*
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* Accumulate status from irb to devstat.
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*/
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void
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ccw_device_accumulate_irb(struct ccw_device *cdev, struct irb *irb)
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{
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struct irb *cdev_irb;
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/*
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* Check if the status pending bit is set in stctl.
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* If not, the remaining bit have no meaning and we must ignore them.
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* The esw is not meaningful as well...
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*/
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if (!(scsw_stctl(&irb->scsw) & SCSW_STCTL_STATUS_PEND))
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return;
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/* Check for channel checks and interface control checks. */
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ccw_device_msg_control_check(cdev, irb);
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/* Check for path not operational. */
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if (scsw_is_valid_pno(&irb->scsw) && scsw_pno(&irb->scsw))
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ccw_device_path_notoper(cdev);
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/* No irb accumulation for transport mode irbs. */
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if (scsw_is_tm(&irb->scsw)) {
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memcpy(&cdev->private->irb, irb, sizeof(struct irb));
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return;
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}
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/*
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* Don't accumulate unsolicited interrupts.
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*/
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if (!scsw_is_solicited(&irb->scsw))
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return;
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cdev_irb = &cdev->private->irb;
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/*
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* If the clear function had been performed, all formerly pending
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* status at the subchannel has been cleared and we must not pass
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* intermediate accumulated status to the device driver.
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*/
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if (irb->scsw.cmd.fctl & SCSW_FCTL_CLEAR_FUNC)
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memset(&cdev->private->irb, 0, sizeof(struct irb));
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/* Copy bits which are valid only for the start function. */
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if (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) {
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/* Copy key. */
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cdev_irb->scsw.cmd.key = irb->scsw.cmd.key;
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/* Copy suspend control bit. */
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cdev_irb->scsw.cmd.sctl = irb->scsw.cmd.sctl;
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/* Accumulate deferred condition code. */
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cdev_irb->scsw.cmd.cc |= irb->scsw.cmd.cc;
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/* Copy ccw format bit. */
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cdev_irb->scsw.cmd.fmt = irb->scsw.cmd.fmt;
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/* Copy prefetch bit. */
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cdev_irb->scsw.cmd.pfch = irb->scsw.cmd.pfch;
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/* Copy initial-status-interruption-control. */
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cdev_irb->scsw.cmd.isic = irb->scsw.cmd.isic;
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/* Copy address limit checking control. */
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cdev_irb->scsw.cmd.alcc = irb->scsw.cmd.alcc;
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/* Copy suppress suspend bit. */
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cdev_irb->scsw.cmd.ssi = irb->scsw.cmd.ssi;
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}
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/* Take care of the extended control bit and extended control word. */
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ccw_device_accumulate_ecw(cdev, irb);
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/* Accumulate function control. */
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cdev_irb->scsw.cmd.fctl |= irb->scsw.cmd.fctl;
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/* Copy activity control. */
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cdev_irb->scsw.cmd.actl = irb->scsw.cmd.actl;
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/* Accumulate status control. */
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cdev_irb->scsw.cmd.stctl |= irb->scsw.cmd.stctl;
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/*
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* Copy ccw address if it is valid. This is a bit simplified
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* but should be close enough for all practical purposes.
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*/
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if ((irb->scsw.cmd.stctl & SCSW_STCTL_PRIM_STATUS) ||
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((irb->scsw.cmd.stctl ==
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(SCSW_STCTL_INTER_STATUS|SCSW_STCTL_STATUS_PEND)) &&
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(irb->scsw.cmd.actl & SCSW_ACTL_DEVACT) &&
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(irb->scsw.cmd.actl & SCSW_ACTL_SCHACT)) ||
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(irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED))
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cdev_irb->scsw.cmd.cpa = irb->scsw.cmd.cpa;
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/* Accumulate device status, but not the device busy flag. */
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cdev_irb->scsw.cmd.dstat &= ~DEV_STAT_BUSY;
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/* dstat is not always valid. */
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if (irb->scsw.cmd.stctl &
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(SCSW_STCTL_PRIM_STATUS | SCSW_STCTL_SEC_STATUS
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| SCSW_STCTL_INTER_STATUS | SCSW_STCTL_ALERT_STATUS))
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cdev_irb->scsw.cmd.dstat |= irb->scsw.cmd.dstat;
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/* Accumulate subchannel status. */
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cdev_irb->scsw.cmd.cstat |= irb->scsw.cmd.cstat;
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/* Copy residual count if it is valid. */
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if ((irb->scsw.cmd.stctl & SCSW_STCTL_PRIM_STATUS) &&
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(irb->scsw.cmd.cstat & ~(SCHN_STAT_PCI | SCHN_STAT_INCORR_LEN))
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== 0)
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cdev_irb->scsw.cmd.count = irb->scsw.cmd.count;
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/* Take care of bits in the extended status word. */
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ccw_device_accumulate_esw(cdev, irb);
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/*
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* Check whether we must issue a SENSE CCW ourselves if there is no
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* concurrent sense facility installed for the subchannel.
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* No sense is required if no delayed sense is pending
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* and we did not get a unit check without sense information.
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*
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* Note: We should check for ioinfo[irq]->flags.consns but VM
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* violates the ESA/390 architecture and doesn't present an
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* operand exception for virtual devices without concurrent
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* sense facility available/supported when enabling the
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* concurrent sense facility.
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*/
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if ((cdev_irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) &&
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!(cdev_irb->esw.esw0.erw.cons))
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cdev->private->flags.dosense = 1;
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}
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/*
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* Do a basic sense.
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*/
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int
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ccw_device_do_sense(struct ccw_device *cdev, struct irb *irb)
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{
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struct subchannel *sch;
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struct ccw1 *sense_ccw;
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int rc;
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sch = to_subchannel(cdev->dev.parent);
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/* A sense is required, can we do it now ? */
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if (scsw_actl(&irb->scsw) & (SCSW_ACTL_DEVACT | SCSW_ACTL_SCHACT))
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/*
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* we received an Unit Check but we have no final
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* status yet, therefore we must delay the SENSE
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* processing. We must not report this intermediate
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* status to the device interrupt handler.
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*/
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return -EBUSY;
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/*
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* We have ending status but no sense information. Do a basic sense.
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*/
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sense_ccw = &to_io_private(sch)->sense_ccw;
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sense_ccw->cmd_code = CCW_CMD_BASIC_SENSE;
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sense_ccw->cda = (__u32) __pa(cdev->private->irb.ecw);
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sense_ccw->count = SENSE_MAX_COUNT;
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sense_ccw->flags = CCW_FLAG_SLI;
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rc = cio_start(sch, sense_ccw, 0xff);
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if (rc == -ENODEV || rc == -EACCES)
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dev_fsm_event(cdev, DEV_EVENT_VERIFY);
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return rc;
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}
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/*
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* Add information from basic sense to devstat.
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*/
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void
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ccw_device_accumulate_basic_sense(struct ccw_device *cdev, struct irb *irb)
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{
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/*
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* Check if the status pending bit is set in stctl.
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* If not, the remaining bit have no meaning and we must ignore them.
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* The esw is not meaningful as well...
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*/
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if (!(scsw_stctl(&irb->scsw) & SCSW_STCTL_STATUS_PEND))
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return;
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/* Check for channel checks and interface control checks. */
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ccw_device_msg_control_check(cdev, irb);
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/* Check for path not operational. */
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if (scsw_is_valid_pno(&irb->scsw) && scsw_pno(&irb->scsw))
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ccw_device_path_notoper(cdev);
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if (!(irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) &&
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(irb->scsw.cmd.dstat & DEV_STAT_CHN_END)) {
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cdev->private->irb.esw.esw0.erw.cons = 1;
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cdev->private->flags.dosense = 0;
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}
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/* Check if path verification is required. */
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if (ccw_device_accumulate_esw_valid(irb) &&
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irb->esw.esw0.erw.pvrf)
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cdev->private->flags.doverify = 1;
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}
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/*
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* This function accumulates the status into the private devstat and
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* starts a basic sense if one is needed.
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*/
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int
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ccw_device_accumulate_and_sense(struct ccw_device *cdev, struct irb *irb)
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{
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ccw_device_accumulate_irb(cdev, irb);
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if ((irb->scsw.cmd.actl & (SCSW_ACTL_DEVACT | SCSW_ACTL_SCHACT)) != 0)
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return -EBUSY;
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/* Check for basic sense. */
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if (cdev->private->flags.dosense &&
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!(irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)) {
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cdev->private->irb.esw.esw0.erw.cons = 1;
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cdev->private->flags.dosense = 0;
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return 0;
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}
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if (cdev->private->flags.dosense) {
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ccw_device_do_sense(cdev, irb);
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return -EBUSY;
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}
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return 0;
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}
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