From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- drivers/s390/cio/device_status.c | 385 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 385 insertions(+) create mode 100644 drivers/s390/cio/device_status.c (limited to 'drivers/s390/cio/device_status.c') diff --git a/drivers/s390/cio/device_status.c b/drivers/s390/cio/device_status.c new file mode 100644 index 000000000000..4ab2e0d95009 --- /dev/null +++ b/drivers/s390/cio/device_status.c @@ -0,0 +1,385 @@ +/* + * drivers/s390/cio/device_status.c + * + * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, + * IBM Corporation + * Author(s): Cornelia Huck(cohuck@de.ibm.com) + * Martin Schwidefsky (schwidefsky@de.ibm.com) + * + * Status accumulation and basic sense functions. + */ + +#include +#include +#include + +#include +#include + +#include "cio.h" +#include "cio_debug.h" +#include "css.h" +#include "device.h" +#include "ioasm.h" + +/* + * Check for any kind of channel or interface control check but don't + * issue the message for the console device + */ +static inline void +ccw_device_msg_control_check(struct ccw_device *cdev, struct irb *irb) +{ + if (!(irb->scsw.cstat & (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 %04X, dev_stat " + ": %02X sch_stat : %02X\n", + cdev->private->devno, cdev->private->irq, + cdev->private->irb.scsw.dstat, + cdev->private->irb.scsw.cstat); + + if (irb->scsw.cc != 3) { + char dbf_text[15]; + + sprintf(dbf_text, "chk%x", cdev->private->irq); + CIO_TRACE_EVENT(0, dbf_text); + CIO_HEX_EVENT(0, &cdev->private->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); + stsch (sch->irq, &sch->schib); + + CIO_MSG_EVENT(0, "%s(%04x) - path(s) %02x are " + "not operational \n", __FUNCTION__, sch->irq, + sch->schib.pmcw.pnom); + + sch->lpm &= ~sch->schib.pmcw.pnom; + if (cdev->private->options.pgroup) + cdev->private->flags.doverify = 1; +} + +/* + * Copy valid bits from the extended control word to device irb. + */ +static inline 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.ectl = 0; + if ((irb->scsw.stctl & SCSW_STCTL_ALERT_STATUS) && + !(irb->scsw.stctl & SCSW_STCTL_INTER_STATUS)) + cdev->private->irb.scsw.ectl = irb->scsw.ectl; + /* Check if extended control word is valid. */ + if (!cdev->private->irb.scsw.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 inline int +ccw_device_accumulate_esw_valid(struct irb *irb) +{ + if (!irb->scsw.eswf && irb->scsw.stctl == SCSW_STCTL_STATUS_PEND) + return 0; + if (irb->scsw.stctl == + (SCSW_STCTL_INTER_STATUS|SCSW_STCTL_STATUS_PEND) && + !(irb->scsw.actl & SCSW_ACTL_SUSPENDED)) + return 0; + return 1; +} + +/* + * Copy valid bits from the extended status word to device irb. + */ +static inline 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.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.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.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->options.pgroup) + 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 (!(irb->scsw.stctl & 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 (irb->scsw.pno && irb->scsw.fctl != 0 && + (!(irb->scsw.stctl & SCSW_STCTL_INTER_STATUS) || + (irb->scsw.actl & SCSW_ACTL_SUSPENDED))) + ccw_device_path_notoper(cdev); + + /* + * Don't accumulate unsolicited interrupts. + */ + if ((irb->scsw.stctl == + (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) && + (!irb->scsw.cc)) + return; + + cdev_irb = &cdev->private->irb; + + /* Copy bits which are valid only for the start function. */ + if (irb->scsw.fctl & SCSW_FCTL_START_FUNC) { + /* Copy key. */ + cdev_irb->scsw.key = irb->scsw.key; + /* Copy suspend control bit. */ + cdev_irb->scsw.sctl = irb->scsw.sctl; + /* Accumulate deferred condition code. */ + cdev_irb->scsw.cc |= irb->scsw.cc; + /* Copy ccw format bit. */ + cdev_irb->scsw.fmt = irb->scsw.fmt; + /* Copy prefetch bit. */ + cdev_irb->scsw.pfch = irb->scsw.pfch; + /* Copy initial-status-interruption-control. */ + cdev_irb->scsw.isic = irb->scsw.isic; + /* Copy address limit checking control. */ + cdev_irb->scsw.alcc = irb->scsw.alcc; + /* Copy suppress suspend bit. */ + cdev_irb->scsw.ssi = irb->scsw.ssi; + } + + /* Take care of the extended control bit and extended control word. */ + ccw_device_accumulate_ecw(cdev, irb); + + /* Accumulate function control. */ + cdev_irb->scsw.fctl |= irb->scsw.fctl; + /* Copy activity control. */ + cdev_irb->scsw.actl= irb->scsw.actl; + /* Accumulate status control. */ + cdev_irb->scsw.stctl |= irb->scsw.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.stctl & SCSW_STCTL_PRIM_STATUS) || + ((irb->scsw.stctl == + (SCSW_STCTL_INTER_STATUS|SCSW_STCTL_STATUS_PEND)) && + (irb->scsw.actl & SCSW_ACTL_DEVACT) && + (irb->scsw.actl & SCSW_ACTL_SCHACT)) || + (irb->scsw.actl & SCSW_ACTL_SUSPENDED)) + cdev_irb->scsw.cpa = irb->scsw.cpa; + /* Accumulate device status, but not the device busy flag. */ + cdev_irb->scsw.dstat &= ~DEV_STAT_BUSY; + cdev_irb->scsw.dstat |= irb->scsw.dstat; + /* Accumulate subchannel status. */ + cdev_irb->scsw.cstat |= irb->scsw.cstat; + /* Copy residual count if it is valid. */ + if ((irb->scsw.stctl & SCSW_STCTL_PRIM_STATUS) && + (irb->scsw.cstat & ~(SCHN_STAT_PCI | SCHN_STAT_INCORR_LEN)) == 0) + cdev_irb->scsw.count = irb->scsw.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.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; + + sch = to_subchannel(cdev->dev.parent); + + /* A sense is required, can we do it now ? */ + if ((irb->scsw.actl & (SCSW_ACTL_DEVACT | SCSW_ACTL_SCHACT)) != 0) + /* + * 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. + */ + sch = to_subchannel(cdev->dev.parent); + sch->sense_ccw.cmd_code = CCW_CMD_BASIC_SENSE; + sch->sense_ccw.cda = (__u32) __pa(cdev->private->irb.ecw); + sch->sense_ccw.count = SENSE_MAX_COUNT; + sch->sense_ccw.flags = CCW_FLAG_SLI; + + return cio_start (sch, &sch->sense_ccw, 0xff); +} + +/* + * 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 (!(irb->scsw.stctl & 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 (irb->scsw.pno && irb->scsw.fctl != 0 && + (!(irb->scsw.stctl & SCSW_STCTL_INTER_STATUS) || + (irb->scsw.actl & SCSW_ACTL_SUSPENDED))) + ccw_device_path_notoper(cdev); + + if (!(irb->scsw.dstat & DEV_STAT_UNIT_CHECK) && + (irb->scsw.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->options.pgroup) + 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.actl & (SCSW_ACTL_DEVACT | SCSW_ACTL_SCHACT)) != 0) + return -EBUSY; + /* Check for basic sense. */ + if (cdev->private->flags.dosense && + !(irb->scsw.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; +} + -- cgit v1.2.3