[deliverable/linux.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"

/*
 * 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", __FUNCTION__,
		      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;

	/* 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->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;

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

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