forked from luck/tmp_suning_uos_patched
a53c8fab3f
Remove the file name from the comment at top of many files. In most cases the file name was wrong anyway, so it's rather pointless. Also unify the IBM copyright statement. We did have a lot of sightly different statements and wanted to change them one after another whenever a file gets touched. However that never happened. Instead people start to take the old/"wrong" statements to use as a template for new files. So unify all of them in one go. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
398 lines
12 KiB
C
398 lines
12 KiB
C
/*
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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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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, cdev->private->schid.ssid,
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cdev->private->schid.sch_no,
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scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw));
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sprintf(dbf_text, "chk%x", cdev->private->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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