1 files changed, 399 insertions, 0 deletions

diff --git a/drivers/s390/cio/device_status.c b/drivers/s390/cio/device_status.c
new file mode 100644
index 000000000..0bd8f2642
--- /dev/null
+++ b/drivers/s390/cio/device_status.c
@@ -0,0 +1,399 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *    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)
+{
+	struct subchannel *sch = to_subchannel(cdev->dev.parent);
+	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, sch->schid.ssid,
+		      sch->schid.sch_no,
+		      scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw));
+	sprintf(dbf_text, "chk%x", sch->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->dma_area->irb.scsw.cmd.ectl = 0;
+	if ((irb->scsw.cmd.stctl & SCSW_STCTL_ALERT_STATUS) &&
+	    !(irb->scsw.cmd.stctl & SCSW_STCTL_INTER_STATUS))
+		cdev->private->dma_area->irb.scsw.cmd.ectl = irb->scsw.cmd.ectl;
+	/* Check if extended control word is valid. */
+	if (!cdev->private->dma_area->irb.scsw.cmd.ectl)
+		return;
+	/* Copy concurrent sense / model dependent information. */
+	memcpy(&cdev->private->dma_area->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->dma_area->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->dma_area->irb, irb, sizeof(struct irb));
+		return;
+	}
+	/*
+	 * Don't accumulate unsolicited interrupts.
+	 */
+	if (!scsw_is_solicited(&irb->scsw))
+		return;
+
+	cdev_irb = &cdev->private->dma_area->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->dma_area->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)->dma_area->sense_ccw;
+	sense_ccw->cmd_code = CCW_CMD_BASIC_SENSE;
+	sense_ccw->cda = (__u32) __pa(cdev->private->dma_area->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->dma_area->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->dma_area->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;
+}
+