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