[mirror_ubuntu-kernels.git] / drivers / s390 / cio / device_status.c

/*
 * drivers/s390/cio/device_status.c
 *
 *    Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
 *			 IBM Corporation
 *    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)
{
	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 0.%x.%04x, dev_stat "
		      ": %02X sch_stat : %02X\n",
		      cdev->private->dev_id.devno, cdev->private->schid.ssid,
		      cdev->private->schid.sch_no,
		      irb->scsw.dstat, irb->scsw.cstat);

	if (irb->scsw.cc != 3) {
		char dbf_text[15];

		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);
	stsch (sch->schid, &sch->schib);

	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;
	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.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 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 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->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;

	/*
	 * 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.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.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;
	/* dstat is not always valid. */
	if (irb->scsw.stctl &
	    (SCSW_STCTL_PRIM_STATUS | SCSW_STCTL_SEC_STATUS
	     | SCSW_STCTL_INTER_STATUS | SCSW_STCTL_ALERT_STATUS))
		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;
	struct ccw1 *sense_ccw;
	int rc;

	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.
	 */
	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;

	/* Reset internal retry indication. */
	cdev->private->flags.intretry = 0;

	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 (!(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->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;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* drivers/s390/cio/device_status.c
	3	*
	4	* Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
	5	* IBM Corporation
4ce3b30c	6	* Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
1da177e4 LT	7	* Martin Schwidefsky (schwidefsky@de.ibm.com)
	8	*
	9	* Status accumulation and basic sense functions.
	10	*/
	11
1da177e4 LT	12	#include <linux/module.h>
	13	#include <linux/init.h>
	14
	15	#include <asm/ccwdev.h>
	16	#include <asm/cio.h>
	17
	18	#include "cio.h"
	19	#include "cio_debug.h"
	20	#include "css.h"
	21	#include "device.h"
	22	#include "ioasm.h"
cd6b4f27	23	#include "io_sch.h"
1da177e4 LT	24
	25	/*
	26	* Check for any kind of channel or interface control check but don't
	27	* issue the message for the console device
	28	*/
4d284cac	29	static void
1da177e4 LT	30	ccw_device_msg_control_check(struct ccw_device cdev, struct irb irb)
	31	{
	32	if (!(irb->scsw.cstat & (SCHN_STAT_CHN_DATA_CHK \|
	33	SCHN_STAT_CHN_CTRL_CHK \|
	34	SCHN_STAT_INTF_CTRL_CHK)))
	35	return;
1da177e4 LT	36	CIO_MSG_EVENT(0, "Channel-Check or Interface-Control-Check "
1da177e4 LT	37	"received"
fb6958a5	38	" ... device %04x on subchannel 0.%x.%04x, dev_stat "
1da177e4	39	": %02X sch_stat : %02X\n",
78964268 CH	40	cdev->private->dev_id.devno, cdev->private->schid.ssid,
78964268 CH	41	cdev->private->schid.sch_no,
1d3ac7aa	42	irb->scsw.dstat, irb->scsw.cstat);
1da177e4 LT	43
	44	if (irb->scsw.cc != 3) {
	45	char dbf_text[15];
	46
78964268	47	sprintf(dbf_text, "chk%x", cdev->private->schid.sch_no);
1da177e4	48	CIO_TRACE_EVENT(0, dbf_text);
1d3ac7aa	49	CIO_HEX_EVENT(0, irb, sizeof (struct irb));
1da177e4 LT	50	}
	51	}
	52
	53	/*
	54	* Some paths became not operational (pno bit in scsw is set).
	55	*/
	56	static void
	57	ccw_device_path_notoper(struct ccw_device *cdev)
	58	{
	59	struct subchannel *sch;
	60
	61	sch = to_subchannel(cdev->dev.parent);
a8237fc4	62	stsch (sch->schid, &sch->schib);
1da177e4	63
fb6958a5	64	CIO_MSG_EVENT(0, "%s(0.%x.%04x) - path(s) %02x are "
2a2cf6b1	65	"not operational \n", __func__,
fb6958a5	66	sch->schid.ssid, sch->schid.sch_no,
1da177e4 LT	67	sch->schib.pmcw.pnom);
	68
	69	sch->lpm &= ~sch->schib.pmcw.pnom;
7e560814	70	cdev->private->flags.doverify = 1;
1da177e4 LT	71	}
	72
	73	/*
	74	* Copy valid bits from the extended control word to device irb.
	75	*/
4d284cac	76	static void
1da177e4 LT	77	ccw_device_accumulate_ecw(struct ccw_device cdev, struct irb irb)
	78	{
	79	/*
	80	* Copy extended control bit if it is valid... yes there
	81	* are condition that have to be met for the extended control
	82	* bit to have meaning. Sick.
	83	*/
	84	cdev->private->irb.scsw.ectl = 0;
	85	if ((irb->scsw.stctl & SCSW_STCTL_ALERT_STATUS) &&
	86	!(irb->scsw.stctl & SCSW_STCTL_INTER_STATUS))
	87	cdev->private->irb.scsw.ectl = irb->scsw.ectl;
	88	/* Check if extended control word is valid. */
	89	if (!cdev->private->irb.scsw.ectl)
	90	return;
	91	/* Copy concurrent sense / model dependent information. */
	92	memcpy (&cdev->private->irb.ecw, irb->ecw, sizeof (irb->ecw));
	93	}
	94
	95	/*
	96	* Check if extended status word is valid.
	97	*/
4d284cac	98	static int
1da177e4 LT	99	ccw_device_accumulate_esw_valid(struct irb *irb)
	100	{
	101	if (!irb->scsw.eswf && irb->scsw.stctl == SCSW_STCTL_STATUS_PEND)
	102	return 0;
	103	if (irb->scsw.stctl ==
	104	(SCSW_STCTL_INTER_STATUS\|SCSW_STCTL_STATUS_PEND) &&
	105	!(irb->scsw.actl & SCSW_ACTL_SUSPENDED))
	106	return 0;
	107	return 1;
	108	}
	109
	110	/*
	111	* Copy valid bits from the extended status word to device irb.
	112	*/
4d284cac	113	static void
1da177e4 LT	114	ccw_device_accumulate_esw(struct ccw_device cdev, struct irb irb)
	115	{
	116	struct irb *cdev_irb;
	117	struct sublog cdev_sublog, sublog;
	118
	119	if (!ccw_device_accumulate_esw_valid(irb))
	120	return;
	121
	122	cdev_irb = &cdev->private->irb;
	123
	124	/* Copy last path used mask. */
	125	cdev_irb->esw.esw1.lpum = irb->esw.esw1.lpum;
	126
	127	/* Copy subchannel logout information if esw is of format 0. */
	128	if (irb->scsw.eswf) {
	129	cdev_sublog = &cdev_irb->esw.esw0.sublog;
	130	sublog = &irb->esw.esw0.sublog;
	131	/* Copy extended status flags. */
	132	cdev_sublog->esf = sublog->esf;
	133	/*
	134	* Copy fields that have a meaning for channel data check
	135	* channel control check and interface control check.
	136	*/
	137	if (irb->scsw.cstat & (SCHN_STAT_CHN_DATA_CHK \|
	138	SCHN_STAT_CHN_CTRL_CHK \|
	139	SCHN_STAT_INTF_CTRL_CHK)) {
	140	/* Copy ancillary report bit. */
	141	cdev_sublog->arep = sublog->arep;
	142	/* Copy field-validity-flags. */
	143	cdev_sublog->fvf = sublog->fvf;
	144	/* Copy storage access code. */
	145	cdev_sublog->sacc = sublog->sacc;
	146	/* Copy termination code. */
	147	cdev_sublog->termc = sublog->termc;
	148	/* Copy sequence code. */
	149	cdev_sublog->seqc = sublog->seqc;
	150	}
	151	/* Copy device status check. */
	152	cdev_sublog->devsc = sublog->devsc;
	153	/* Copy secondary error. */
	154	cdev_sublog->serr = sublog->serr;
	155	/* Copy i/o-error alert. */
	156	cdev_sublog->ioerr = sublog->ioerr;
	157	/* Copy channel path timeout bit. */
	158	if (irb->scsw.cstat & SCHN_STAT_INTF_CTRL_CHK)
	159	cdev_irb->esw.esw0.erw.cpt = irb->esw.esw0.erw.cpt;
	160	/* Copy failing storage address validity flag. */
	161	cdev_irb->esw.esw0.erw.fsavf = irb->esw.esw0.erw.fsavf;
	162	if (cdev_irb->esw.esw0.erw.fsavf) {
	163	/* ... and copy the failing storage address. */
	164	memcpy(cdev_irb->esw.esw0.faddr, irb->esw.esw0.faddr,
	165	sizeof (irb->esw.esw0.faddr));
	166	/* ... and copy the failing storage address format. */
	167	cdev_irb->esw.esw0.erw.fsaf = irb->esw.esw0.erw.fsaf;
	168	}
	169	/* Copy secondary ccw address validity bit. */
	170	cdev_irb->esw.esw0.erw.scavf = irb->esw.esw0.erw.scavf;
	171	if (irb->esw.esw0.erw.scavf)
	172	/* ... and copy the secondary ccw address. */
	173	cdev_irb->esw.esw0.saddr = irb->esw.esw0.saddr;
	174
	175	}
	176	/* FIXME: DCTI for format 2? */
	177
178	/* Copy authorization bit. */
179	cdev_irb->esw.esw0.erw.auth = irb->esw.esw0.erw.auth;
180	/* Copy path verification required flag. */
181	cdev_irb->esw.esw0.erw.pvrf = irb->esw.esw0.erw.pvrf;
7e560814	182	if (irb->esw.esw0.erw.pvrf)
1da177e4 LT	183	cdev->private->flags.doverify = 1;
	184	/* Copy concurrent sense bit. */
	185	cdev_irb->esw.esw0.erw.cons = irb->esw.esw0.erw.cons;
	186	if (irb->esw.esw0.erw.cons)
	187	cdev_irb->esw.esw0.erw.scnt = irb->esw.esw0.erw.scnt;
	188	}
	189
	190	/*
	191	* Accumulate status from irb to devstat.
	192	*/
	193	void
	194	ccw_device_accumulate_irb(struct ccw_device cdev, struct irb irb)
	195	{
	196	struct irb *cdev_irb;
	197
	198	/*
	199	* Check if the status pending bit is set in stctl.
	200	* If not, the remaining bit have no meaning and we must ignore them.
	201	* The esw is not meaningful as well...
	202	*/
	203	if (!(irb->scsw.stctl & SCSW_STCTL_STATUS_PEND))
	204	return;
	205
	206	/* Check for channel checks and interface control checks. */
	207	ccw_device_msg_control_check(cdev, irb);
	208
	209	/* Check for path not operational. */
	210	if (irb->scsw.pno && irb->scsw.fctl != 0 &&
	211	(!(irb->scsw.stctl & SCSW_STCTL_INTER_STATUS) \|\|
	212	(irb->scsw.actl & SCSW_ACTL_SUSPENDED)))
	213	ccw_device_path_notoper(cdev);
	214
	215	/*
	216	* Don't accumulate unsolicited interrupts.
	217	*/
	218	if ((irb->scsw.stctl ==
	219	(SCSW_STCTL_STATUS_PEND \| SCSW_STCTL_ALERT_STATUS)) &&
	220	(!irb->scsw.cc))
	221	return;
	222
	223	cdev_irb = &cdev->private->irb;
	224
8c3ce5be CH	225	/*
	226	* If the clear function had been performed, all formerly pending
	227	* status at the subchannel has been cleared and we must not pass
	228	* intermediate accumulated status to the device driver.
	229	*/
	230	if (irb->scsw.fctl & SCSW_FCTL_CLEAR_FUNC)
	231	memset(&cdev->private->irb, 0, sizeof(struct irb));
	232
1da177e4 LT	233	/* Copy bits which are valid only for the start function. */
	234	if (irb->scsw.fctl & SCSW_FCTL_START_FUNC) {
	235	/* Copy key. */
	236	cdev_irb->scsw.key = irb->scsw.key;
	237	/* Copy suspend control bit. */
	238	cdev_irb->scsw.sctl = irb->scsw.sctl;
	239	/* Accumulate deferred condition code. */
	240	cdev_irb->scsw.cc \|= irb->scsw.cc;
	241	/* Copy ccw format bit. */
	242	cdev_irb->scsw.fmt = irb->scsw.fmt;
	243	/* Copy prefetch bit. */
	244	cdev_irb->scsw.pfch = irb->scsw.pfch;
	245	/* Copy initial-status-interruption-control. */
	246	cdev_irb->scsw.isic = irb->scsw.isic;
	247	/* Copy address limit checking control. */
	248	cdev_irb->scsw.alcc = irb->scsw.alcc;
	249	/* Copy suppress suspend bit. */
	250	cdev_irb->scsw.ssi = irb->scsw.ssi;
	251	}
	252
	253	/* Take care of the extended control bit and extended control word. */
	254	ccw_device_accumulate_ecw(cdev, irb);
	255
	256	/* Accumulate function control. */
	257	cdev_irb->scsw.fctl \|= irb->scsw.fctl;
	258	/* Copy activity control. */
	259	cdev_irb->scsw.actl= irb->scsw.actl;
	260	/* Accumulate status control. */
	261	cdev_irb->scsw.stctl \|= irb->scsw.stctl;
	262	/*
	263	* Copy ccw address if it is valid. This is a bit simplified
	264	* but should be close enough for all practical purposes.
	265	*/
	266	if ((irb->scsw.stctl & SCSW_STCTL_PRIM_STATUS) \|\|
	267	((irb->scsw.stctl ==
	268	(SCSW_STCTL_INTER_STATUS\|SCSW_STCTL_STATUS_PEND)) &&
	269	(irb->scsw.actl & SCSW_ACTL_DEVACT) &&
	270	(irb->scsw.actl & SCSW_ACTL_SCHACT)) \|\|
	271	(irb->scsw.actl & SCSW_ACTL_SUSPENDED))
	272	cdev_irb->scsw.cpa = irb->scsw.cpa;
	273	/* Accumulate device status, but not the device busy flag. */
	274	cdev_irb->scsw.dstat &= ~DEV_STAT_BUSY;
25c61a1f CH	275	/* dstat is not always valid. */
	276	if (irb->scsw.stctl &
	277	(SCSW_STCTL_PRIM_STATUS \| SCSW_STCTL_SEC_STATUS
	278	\| SCSW_STCTL_INTER_STATUS \| SCSW_STCTL_ALERT_STATUS))
	279	cdev_irb->scsw.dstat \|= irb->scsw.dstat;
1da177e4 LT	280	/* Accumulate subchannel status. */
	281	cdev_irb->scsw.cstat \|= irb->scsw.cstat;
	282	/* Copy residual count if it is valid. */
	283	if ((irb->scsw.stctl & SCSW_STCTL_PRIM_STATUS) &&
	284	(irb->scsw.cstat & ~(SCHN_STAT_PCI \| SCHN_STAT_INCORR_LEN)) == 0)
	285	cdev_irb->scsw.count = irb->scsw.count;
	286
	287	/* Take care of bits in the extended status word. */
	288	ccw_device_accumulate_esw(cdev, irb);
	289
	290	/*
	291	* Check whether we must issue a SENSE CCW ourselves if there is no
	292	* concurrent sense facility installed for the subchannel.
	293	* No sense is required if no delayed sense is pending
	294	* and we did not get a unit check without sense information.
	295	*
	296	* Note: We should check for ioinfo[irq]->flags.consns but VM
	297	* violates the ESA/390 architecture and doesn't present an
	298	* operand exception for virtual devices without concurrent
	299	* sense facility available/supported when enabling the
	300	* concurrent sense facility.
	301	*/
	302	if ((cdev_irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
	303	!(cdev_irb->esw.esw0.erw.cons))
	304	cdev->private->flags.dosense = 1;
	305	}
	306
	307	/*
	308	* Do a basic sense.
	309	*/
	310	int
	311	ccw_device_do_sense(struct ccw_device cdev, struct irb irb)
	312	{
	313	struct subchannel *sch;
cd6b4f27	314	struct ccw1 *sense_ccw;
fe6173d9	315	int rc;
1da177e4 LT	316
	317	sch = to_subchannel(cdev->dev.parent);
	318
	319	/* A sense is required, can we do it now ? */
	320	if ((irb->scsw.actl & (SCSW_ACTL_DEVACT \| SCSW_ACTL_SCHACT)) != 0)
	321	/*
	322	* we received an Unit Check but we have no final
	323	* status yet, therefore we must delay the SENSE
	324	* processing. We must not report this intermediate
	325	* status to the device interrupt handler.
	326	*/
	327	return -EBUSY;
	328
	329	/*
	330	* We have ending status but no sense information. Do a basic sense.
	331	*/
cd6b4f27 CH	332	sense_ccw = &to_io_private(sch)->sense_ccw;
	333	sense_ccw->cmd_code = CCW_CMD_BASIC_SENSE;
	334	sense_ccw->cda = (__u32) __pa(cdev->private->irb.ecw);
	335	sense_ccw->count = SENSE_MAX_COUNT;
	336	sense_ccw->flags = CCW_FLAG_SLI;
1da177e4	337
d23861ff CH	338	/* Reset internal retry indication. */
	339	cdev->private->flags.intretry = 0;
	340
fe6173d9 CH	341	rc = cio_start(sch, sense_ccw, 0xff);
	342	if (rc == -ENODEV \|\| rc == -EACCES)
	343	dev_fsm_event(cdev, DEV_EVENT_VERIFY);
	344	return rc;
1da177e4 LT	345	}
	346
	347	/*
	348	* Add information from basic sense to devstat.
	349	*/
	350	void
	351	ccw_device_accumulate_basic_sense(struct ccw_device cdev, struct irb irb)
	352	{
	353	/*
	354	* Check if the status pending bit is set in stctl.
	355	* If not, the remaining bit have no meaning and we must ignore them.
	356	* The esw is not meaningful as well...
	357	*/
	358	if (!(irb->scsw.stctl & SCSW_STCTL_STATUS_PEND))
	359	return;
	360
	361	/* Check for channel checks and interface control checks. */
	362	ccw_device_msg_control_check(cdev, irb);
	363
	364	/* Check for path not operational. */
	365	if (irb->scsw.pno && irb->scsw.fctl != 0 &&
	366	(!(irb->scsw.stctl & SCSW_STCTL_INTER_STATUS) \|\|
	367	(irb->scsw.actl & SCSW_ACTL_SUSPENDED)))
	368	ccw_device_path_notoper(cdev);
	369
	370	if (!(irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
	371	(irb->scsw.dstat & DEV_STAT_CHN_END)) {
	372	cdev->private->irb.esw.esw0.erw.cons = 1;
	373	cdev->private->flags.dosense = 0;
	374	}
	375	/* Check if path verification is required. */
	376	if (ccw_device_accumulate_esw_valid(irb) &&
7e560814	377	irb->esw.esw0.erw.pvrf)
1da177e4 LT	378	cdev->private->flags.doverify = 1;
	379	}
	380
	381	/*
	382	* This function accumulates the status into the private devstat and
	383	* starts a basic sense if one is needed.
	384	*/
	385	int
	386	ccw_device_accumulate_and_sense(struct ccw_device cdev, struct irb irb)
	387	{
	388	ccw_device_accumulate_irb(cdev, irb);
	389	if ((irb->scsw.actl & (SCSW_ACTL_DEVACT \| SCSW_ACTL_SCHACT)) != 0)
	390	return -EBUSY;
	391	/* Check for basic sense. */
	392	if (cdev->private->flags.dosense &&
	393	!(irb->scsw.dstat & DEV_STAT_UNIT_CHECK)) {
	394	cdev->private->irb.esw.esw0.erw.cons = 1;
	395	cdev->private->flags.dosense = 0;
	396	return 0;
	397	}
	398	if (cdev->private->flags.dosense) {
	399	ccw_device_do_sense(cdev, irb);
	400	return -EBUSY;
	401	}
	402	return 0;
	403	}
	404