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

// 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->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;
}
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4	2	/*
a53c8fab	3	* Copyright IBM Corp. 2002
4ce3b30c	4	* Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
1da177e4 LT	5	* Martin Schwidefsky (schwidefsky@de.ibm.com)
	6	*
	7	* Status accumulation and basic sense functions.
	8	*/
	9
1da177e4 LT	10	#include <linux/module.h>
	11	#include <linux/init.h>
	12
	13	#include <asm/ccwdev.h>
	14	#include <asm/cio.h>
	15
	16	#include "cio.h"
	17	#include "cio_debug.h"
	18	#include "css.h"
	19	#include "device.h"
	20	#include "ioasm.h"
cd6b4f27	21	#include "io_sch.h"
1da177e4 LT	22
	23	/*
	24	* Check for any kind of channel or interface control check but don't
	25	* issue the message for the console device
	26	*/
4d284cac	27	static void
1da177e4 LT	28	ccw_device_msg_control_check(struct ccw_device cdev, struct irb irb)
1da177e4 LT	29	{
7de6a63c	30	struct subchannel *sch = to_subchannel(cdev->dev.parent);
23d805b6 PO	31	char dbf_text[15];
	32
	33	if (!scsw_is_valid_cstat(&irb->scsw) \|\|
	34	!(scsw_cstat(&irb->scsw) & (SCHN_STAT_CHN_DATA_CHK \|
	35	SCHN_STAT_CHN_CTRL_CHK \| SCHN_STAT_INTF_CTRL_CHK)))
1da177e4	36	return;
1da177e4 LT	37	CIO_MSG_EVENT(0, "Channel-Check or Interface-Control-Check "
1da177e4 LT	38	"received"
fb6958a5	39	" ... device %04x on subchannel 0.%x.%04x, dev_stat "
1da177e4	40	": %02X sch_stat : %02X\n",
7de6a63c SO	41	cdev->private->dev_id.devno, sch->schid.ssid,
7de6a63c SO	42	sch->schid.sch_no,
23d805b6	43	scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw));
7de6a63c	44	sprintf(dbf_text, "chk%x", sch->schid.sch_no);
23d805b6 PO	45	CIO_TRACE_EVENT(0, dbf_text);
23d805b6 PO	46	CIO_HEX_EVENT(0, irb, sizeof(struct irb));
1da177e4 LT	47	}
	48
	49	/*
	50	* Some paths became not operational (pno bit in scsw is set).
	51	*/
	52	static void
	53	ccw_device_path_notoper(struct ccw_device *cdev)
	54	{
	55	struct subchannel *sch;
	56
	57	sch = to_subchannel(cdev->dev.parent);
cdb912a4 SO	58	if (cio_update_schib(sch))
cdb912a4 SO	59	goto doverify;
1da177e4	60
fb6958a5	61	CIO_MSG_EVENT(0, "%s(0.%x.%04x) - path(s) %02x are "
2a2cf6b1	62	"not operational \n", __func__,
fb6958a5	63	sch->schid.ssid, sch->schid.sch_no,
1da177e4 LT	64	sch->schib.pmcw.pnom);
	65
	66	sch->lpm &= ~sch->schib.pmcw.pnom;
cdb912a4	67	doverify:
7e560814	68	cdev->private->flags.doverify = 1;
1da177e4 LT	69	}
	70
	71	/*
	72	* Copy valid bits from the extended control word to device irb.
	73	*/
4d284cac	74	static void
1da177e4 LT	75	ccw_device_accumulate_ecw(struct ccw_device cdev, struct irb irb)
	76	{
	77	/*
	78	* Copy extended control bit if it is valid... yes there
	79	* are condition that have to be met for the extended control
	80	* bit to have meaning. Sick.
	81	*/
23d805b6 PO	82	cdev->private->irb.scsw.cmd.ectl = 0;
	83	if ((irb->scsw.cmd.stctl & SCSW_STCTL_ALERT_STATUS) &&
	84	!(irb->scsw.cmd.stctl & SCSW_STCTL_INTER_STATUS))
	85	cdev->private->irb.scsw.cmd.ectl = irb->scsw.cmd.ectl;
1da177e4	86	/* Check if extended control word is valid. */
23d805b6	87	if (!cdev->private->irb.scsw.cmd.ectl)
1da177e4 LT	88	return;
	89	/* Copy concurrent sense / model dependent information. */
	90	memcpy (&cdev->private->irb.ecw, irb->ecw, sizeof (irb->ecw));
	91	}
	92
	93	/*
	94	* Check if extended status word is valid.
	95	*/
4d284cac	96	static int
1da177e4 LT	97	ccw_device_accumulate_esw_valid(struct irb *irb)
1da177e4 LT	98	{
23d805b6 PO	99	if (!irb->scsw.cmd.eswf &&
23d805b6 PO	100	(irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND))
1da177e4	101	return 0;
23d805b6 PO	102	if (irb->scsw.cmd.stctl ==
	103	(SCSW_STCTL_INTER_STATUS\|SCSW_STCTL_STATUS_PEND) &&
	104	!(irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED))
1da177e4 LT	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. */
23d805b6	127	if (irb->scsw.cmd.eswf) {
1da177e4 LT	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	*/
23d805b6	136	if (irb->scsw.cmd.cstat & (SCHN_STAT_CHN_DATA_CHK \|
1da177e4 LT	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. */
23d805b6	157	if (irb->scsw.cmd.cstat & SCHN_STAT_INTF_CTRL_CHK)
1da177e4 LT	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	*/
23d805b6	202	if (!(scsw_stctl(&irb->scsw) & SCSW_STCTL_STATUS_PEND))
1da177e4 LT	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. */
23d805b6	209	if (scsw_is_valid_pno(&irb->scsw) && scsw_pno(&irb->scsw))
1da177e4	210	ccw_device_path_notoper(cdev);
23d805b6 PO	211	/* No irb accumulation for transport mode irbs. */
	212	if (scsw_is_tm(&irb->scsw)) {
	213	memcpy(&cdev->private->irb, irb, sizeof(struct irb));
	214	return;
	215	}
1da177e4 LT	216	/*
	217	* Don't accumulate unsolicited interrupts.
	218	*/
23d805b6	219	if (!scsw_is_solicited(&irb->scsw))
1da177e4 LT	220	return;
	221
	222	cdev_irb = &cdev->private->irb;
	223
8c3ce5be CH	224	/*
	225	* If the clear function had been performed, all formerly pending
	226	* status at the subchannel has been cleared and we must not pass
	227	* intermediate accumulated status to the device driver.
	228	*/
23d805b6	229	if (irb->scsw.cmd.fctl & SCSW_FCTL_CLEAR_FUNC)
8c3ce5be CH	230	memset(&cdev->private->irb, 0, sizeof(struct irb));
8c3ce5be CH	231
1da177e4	232	/* Copy bits which are valid only for the start function. */
23d805b6	233	if (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) {
1da177e4	234	/* Copy key. */
23d805b6	235	cdev_irb->scsw.cmd.key = irb->scsw.cmd.key;
1da177e4	236	/* Copy suspend control bit. */
23d805b6	237	cdev_irb->scsw.cmd.sctl = irb->scsw.cmd.sctl;
1da177e4	238	/* Accumulate deferred condition code. */
23d805b6	239	cdev_irb->scsw.cmd.cc \|= irb->scsw.cmd.cc;
1da177e4	240	/* Copy ccw format bit. */
23d805b6	241	cdev_irb->scsw.cmd.fmt = irb->scsw.cmd.fmt;
1da177e4	242	/* Copy prefetch bit. */
23d805b6	243	cdev_irb->scsw.cmd.pfch = irb->scsw.cmd.pfch;
1da177e4	244	/* Copy initial-status-interruption-control. */
23d805b6	245	cdev_irb->scsw.cmd.isic = irb->scsw.cmd.isic;
1da177e4	246	/* Copy address limit checking control. */
23d805b6	247	cdev_irb->scsw.cmd.alcc = irb->scsw.cmd.alcc;
1da177e4	248	/* Copy suppress suspend bit. */
23d805b6	249	cdev_irb->scsw.cmd.ssi = irb->scsw.cmd.ssi;
1da177e4 LT	250	}
	251
	252	/* Take care of the extended control bit and extended control word. */
	253	ccw_device_accumulate_ecw(cdev, irb);
	254
	255	/* Accumulate function control. */
23d805b6	256	cdev_irb->scsw.cmd.fctl \|= irb->scsw.cmd.fctl;
1da177e4	257	/* Copy activity control. */
23d805b6	258	cdev_irb->scsw.cmd.actl = irb->scsw.cmd.actl;
1da177e4	259	/* Accumulate status control. */
23d805b6	260	cdev_irb->scsw.cmd.stctl \|= irb->scsw.cmd.stctl;
1da177e4 LT	261	/*
	262	* Copy ccw address if it is valid. This is a bit simplified
	263	* but should be close enough for all practical purposes.
	264	*/
23d805b6 PO	265	if ((irb->scsw.cmd.stctl & SCSW_STCTL_PRIM_STATUS) \|\|
23d805b6 PO	266	((irb->scsw.cmd.stctl ==
1da177e4	267	(SCSW_STCTL_INTER_STATUS\|SCSW_STCTL_STATUS_PEND)) &&
23d805b6 PO	268	(irb->scsw.cmd.actl & SCSW_ACTL_DEVACT) &&
	269	(irb->scsw.cmd.actl & SCSW_ACTL_SCHACT)) \|\|
	270	(irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED))
	271	cdev_irb->scsw.cmd.cpa = irb->scsw.cmd.cpa;
1da177e4	272	/* Accumulate device status, but not the device busy flag. */
23d805b6	273	cdev_irb->scsw.cmd.dstat &= ~DEV_STAT_BUSY;
25c61a1f	274	/* dstat is not always valid. */
23d805b6	275	if (irb->scsw.cmd.stctl &
25c61a1f CH	276	(SCSW_STCTL_PRIM_STATUS \| SCSW_STCTL_SEC_STATUS
25c61a1f CH	277	\| SCSW_STCTL_INTER_STATUS \| SCSW_STCTL_ALERT_STATUS))
23d805b6	278	cdev_irb->scsw.cmd.dstat \|= irb->scsw.cmd.dstat;
1da177e4	279	/* Accumulate subchannel status. */
23d805b6	280	cdev_irb->scsw.cmd.cstat \|= irb->scsw.cmd.cstat;
1da177e4	281	/* Copy residual count if it is valid. */
23d805b6 PO	282	if ((irb->scsw.cmd.stctl & SCSW_STCTL_PRIM_STATUS) &&
	283	(irb->scsw.cmd.cstat & ~(SCHN_STAT_PCI \| SCHN_STAT_INCORR_LEN))
	284	== 0)
	285	cdev_irb->scsw.cmd.count = irb->scsw.cmd.count;
1da177e4 LT	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	*/
23d805b6	302	if ((cdev_irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) &&
1da177e4 LT	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 ? */
23d805b6	320	if (scsw_actl(&irb->scsw) & (SCSW_ACTL_DEVACT \| SCSW_ACTL_SCHACT))
1da177e4 LT	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
fe6173d9 CH	338	rc = cio_start(sch, sense_ccw, 0xff);
	339	if (rc == -ENODEV \|\| rc == -EACCES)
	340	dev_fsm_event(cdev, DEV_EVENT_VERIFY);
	341	return rc;
1da177e4 LT	342	}
	343
	344	/*
	345	* Add information from basic sense to devstat.
	346	*/
	347	void
	348	ccw_device_accumulate_basic_sense(struct ccw_device cdev, struct irb irb)
	349	{
	350	/*
	351	* Check if the status pending bit is set in stctl.
	352	* If not, the remaining bit have no meaning and we must ignore them.
	353	* The esw is not meaningful as well...
	354	*/
23d805b6	355	if (!(scsw_stctl(&irb->scsw) & SCSW_STCTL_STATUS_PEND))
1da177e4 LT	356	return;
	357
	358	/* Check for channel checks and interface control checks. */
	359	ccw_device_msg_control_check(cdev, irb);
	360
	361	/* Check for path not operational. */
23d805b6	362	if (scsw_is_valid_pno(&irb->scsw) && scsw_pno(&irb->scsw))
1da177e4 LT	363	ccw_device_path_notoper(cdev);
1da177e4 LT	364
23d805b6 PO	365	if (!(irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) &&
23d805b6 PO	366	(irb->scsw.cmd.dstat & DEV_STAT_CHN_END)) {
1da177e4 LT	367	cdev->private->irb.esw.esw0.erw.cons = 1;
	368	cdev->private->flags.dosense = 0;
	369	}
	370	/* Check if path verification is required. */
	371	if (ccw_device_accumulate_esw_valid(irb) &&
7e560814	372	irb->esw.esw0.erw.pvrf)
1da177e4 LT	373	cdev->private->flags.doverify = 1;
	374	}
	375
	376	/*
	377	* This function accumulates the status into the private devstat and
	378	* starts a basic sense if one is needed.
	379	*/
	380	int
	381	ccw_device_accumulate_and_sense(struct ccw_device cdev, struct irb irb)
	382	{
	383	ccw_device_accumulate_irb(cdev, irb);
23d805b6	384	if ((irb->scsw.cmd.actl & (SCSW_ACTL_DEVACT \| SCSW_ACTL_SCHACT)) != 0)
1da177e4 LT	385	return -EBUSY;
	386	/* Check for basic sense. */
	387	if (cdev->private->flags.dosense &&
23d805b6	388	!(irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)) {
1da177e4 LT	389	cdev->private->irb.esw.esw0.erw.cons = 1;
	390	cdev->private->flags.dosense = 0;
	391	return 0;
	392	}
	393	if (cdev->private->flags.dosense) {
	394	ccw_device_do_sense(cdev, irb);
	395	return -EBUSY;
	396	}
	397	return 0;
	398	}
	399