Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 2742 insertions, 0 deletions

diff --git a/drivers/s390/block/dasd_3990_erp.c b/drivers/s390/block/dasd_3990_erp.c
new file mode 100644
index 000000000000..c143ecb53d9d
--- /dev/null
+++ b/drivers/s390/block/dasd_3990_erp.c
@@ -0,0 +1,2742 @@
+/* 
+ * File...........: linux/drivers/s390/block/dasd_3990_erp.c
+ * Author(s)......: Horst  Hummel    <Horst.Hummel@de.ibm.com> 
+ *		    Holger Smolinski <Holger.Smolinski@de.ibm.com>
+ * Bugreports.to..: <Linux390@de.ibm.com>
+ * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 2000, 2001
+ *
+ * $Revision: 1.36 $
+ */
+
+#include <linux/timer.h>
+#include <linux/slab.h>
+#include <asm/idals.h>
+#include <asm/todclk.h>
+
+#define PRINTK_HEADER "dasd_erp(3990): "
+
+#include "dasd_int.h"
+#include "dasd_eckd.h"
+
+
+struct DCTL_data {
+	unsigned char subcommand;  /* e.g Inhibit Write, Enable Write,... */
+	unsigned char modifier;	   /* Subcommand modifier */
+	unsigned short res;	   /* reserved */
+} __attribute__ ((packed));
+
+/*
+ ***************************************************************************** 
+ * SECTION ERP EXAMINATION
+ ***************************************************************************** 
+ */
+
+/*
+ * DASD_3990_ERP_EXAMINE_24 
+ *
+ * DESCRIPTION
+ *   Checks only for fatal (unrecoverable) error. 
+ *   A detailed examination of the sense data is done later outside
+ *   the interrupt handler.
+ *
+ *   Each bit configuration leading to an action code 2 (Exit with
+ *   programming error or unusual condition indication)
+ *   are handled as fatal errorīs.
+ * 
+ *   All other configurations are handled as recoverable errors.
+ *
+ * RETURN VALUES
+ *   dasd_era_fatal	for all fatal (unrecoverable errors)
+ *   dasd_era_recover	for all others.
+ */
+static dasd_era_t
+dasd_3990_erp_examine_24(struct dasd_ccw_req * cqr, char *sense)
+{
+
+	struct dasd_device *device = cqr->device;
+
+	/* check for 'Command Reject' */
+	if ((sense[0] & SNS0_CMD_REJECT) &&
+	    (!(sense[2] & SNS2_ENV_DATA_PRESENT))) {
+
+		DEV_MESSAGE(KERN_ERR, device, "%s",
+			    "EXAMINE 24: Command Reject detected - "
+			    "fatal error");
+
+		return dasd_era_fatal;
+	}
+
+	/* check for 'Invalid Track Format' */
+	if ((sense[1] & SNS1_INV_TRACK_FORMAT) &&
+	    (!(sense[2] & SNS2_ENV_DATA_PRESENT))) {
+
+		DEV_MESSAGE(KERN_ERR, device, "%s",
+			    "EXAMINE 24: Invalid Track Format detected "
+			    "- fatal error");
+
+		return dasd_era_fatal;
+	}
+
+	/* check for 'No Record Found' */
+	if (sense[1] & SNS1_NO_REC_FOUND) {
+
+                /* FIXME: fatal error ?!? */
+		DEV_MESSAGE(KERN_ERR, device,
+			    "EXAMINE 24: No Record Found detected %s",
+                            device->state <= DASD_STATE_BASIC ?
+			    " " : "- fatal error");
+
+		return dasd_era_fatal;
+	}
+
+	/* return recoverable for all others */
+	return dasd_era_recover;
+}				/* END dasd_3990_erp_examine_24 */
+
+/*
+ * DASD_3990_ERP_EXAMINE_32 
+ *
+ * DESCRIPTION
+ *   Checks only for fatal/no/recoverable error. 
+ *   A detailed examination of the sense data is done later outside
+ *   the interrupt handler.
+ *
+ * RETURN VALUES
+ *   dasd_era_none	no error 
+ *   dasd_era_fatal	for all fatal (unrecoverable errors)
+ *   dasd_era_recover	for recoverable others.
+ */
+static dasd_era_t
+dasd_3990_erp_examine_32(struct dasd_ccw_req * cqr, char *sense)
+{
+
+	struct dasd_device *device = cqr->device;
+
+	switch (sense[25]) {
+	case 0x00:
+		return dasd_era_none;
+
+	case 0x01:
+		DEV_MESSAGE(KERN_ERR, device, "%s", "EXAMINE 32: fatal error");
+
+		return dasd_era_fatal;
+
+	default:
+
+		return dasd_era_recover;
+	}
+
+}				/* end dasd_3990_erp_examine_32 */
+
+/*
+ * DASD_3990_ERP_EXAMINE 
+ *
+ * DESCRIPTION
+ *   Checks only for fatal/no/recover error. 
+ *   A detailed examination of the sense data is done later outside
+ *   the interrupt handler.
+ *
+ *   The logic is based on the 'IBM 3990 Storage Control  Reference' manual
+ *   'Chapter 7. Error Recovery Procedures'.
+ *
+ * RETURN VALUES
+ *   dasd_era_none	no error 
+ *   dasd_era_fatal	for all fatal (unrecoverable errors)
+ *   dasd_era_recover	for all others.
+ */
+dasd_era_t
+dasd_3990_erp_examine(struct dasd_ccw_req * cqr, struct irb * irb)
+{
+
+	char *sense = irb->ecw;
+	dasd_era_t era = dasd_era_recover;
+	struct dasd_device *device = cqr->device;
+
+	/* check for successful execution first */
+	if (irb->scsw.cstat == 0x00 &&
+	    irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END))
+		return dasd_era_none;
+
+	/* distinguish between 24 and 32 byte sense data */
+	if (sense[27] & DASD_SENSE_BIT_0) {
+
+		era = dasd_3990_erp_examine_24(cqr, sense);
+
+	} else {
+
+		era = dasd_3990_erp_examine_32(cqr, sense);
+
+	}
+
+	/* log the erp chain if fatal error occurred */
+	if ((era == dasd_era_fatal) && (device->state >= DASD_STATE_READY)) {
+		dasd_log_sense(cqr, irb);
+		dasd_log_ccw(cqr, 0, irb->scsw.cpa);
+	}
+
+	return era;
+
+}				/* END dasd_3990_erp_examine */
+
+/*
+ ***************************************************************************** 
+ * SECTION ERP HANDLING
+ ***************************************************************************** 
+ */
+/*
+ ***************************************************************************** 
+ * 24 and 32 byte sense ERP functions
+ ***************************************************************************** 
+ */
+
+/*
+ * DASD_3990_ERP_CLEANUP 
+ *
+ * DESCRIPTION
+ *   Removes the already build but not necessary ERP request and sets
+ *   the status of the original cqr / erp to the given (final) status
+ *
+ *  PARAMETER
+ *   erp		request to be blocked
+ *   final_status	either DASD_CQR_DONE or DASD_CQR_FAILED 
+ *
+ * RETURN VALUES
+ *   cqr		original cqr		   
+ */
+static struct dasd_ccw_req *
+dasd_3990_erp_cleanup(struct dasd_ccw_req * erp, char final_status)
+{
+	struct dasd_ccw_req *cqr = erp->refers;
+
+	dasd_free_erp_request(erp, erp->device);
+	cqr->status = final_status;
+	return cqr;
+
+}				/* end dasd_3990_erp_cleanup */
+
+/*
+ * DASD_3990_ERP_BLOCK_QUEUE 
+ *
+ * DESCRIPTION
+ *   Block the given device request queue to prevent from further
+ *   processing until the started timer has expired or an related
+ *   interrupt was received.
+ */
+static void
+dasd_3990_erp_block_queue(struct dasd_ccw_req * erp, int expires)
+{
+
+	struct dasd_device *device = erp->device;
+
+	DEV_MESSAGE(KERN_INFO, device,
+		    "blocking request queue for %is", expires/HZ);
+
+	device->stopped |= DASD_STOPPED_PENDING;
+	erp->status = DASD_CQR_QUEUED;
+
+	dasd_set_timer(device, expires);
+}
+
+/*
+ * DASD_3990_ERP_INT_REQ 
+ *
+ * DESCRIPTION
+ *   Handles 'Intervention Required' error.
+ *   This means either device offline or not installed.
+ *
+ * PARAMETER
+ *   erp		current erp
+ * RETURN VALUES
+ *   erp		modified erp
+ */
+static struct dasd_ccw_req *
+dasd_3990_erp_int_req(struct dasd_ccw_req * erp)
+{
+
+	struct dasd_device *device = erp->device;
+
+	/* first time set initial retry counter and erp_function */
+	/* and retry once without blocking queue		 */
+	/* (this enables easier enqueing of the cqr)		 */
+	if (erp->function != dasd_3990_erp_int_req) {
+
+		erp->retries = 256;
+		erp->function = dasd_3990_erp_int_req;
+
+	} else {
+
+		/* issue a message and wait for 'device ready' interrupt */
+		DEV_MESSAGE(KERN_ERR, device, "%s",
+			    "is offline or not installed - "
+			    "INTERVENTION REQUIRED!!");
+
+		dasd_3990_erp_block_queue(erp, 60*HZ);
+	}
+
+	return erp;
+
+}				/* end dasd_3990_erp_int_req */
+
+/*
+ * DASD_3990_ERP_ALTERNATE_PATH 
+ *
+ * DESCRIPTION
+ *   Repeat the operation on a different channel path.
+ *   If all alternate paths have been tried, the request is posted with a
+ *   permanent error.
+ *
+ *  PARAMETER
+ *   erp		pointer to the current ERP
+ *
+ * RETURN VALUES
+ *   erp		modified pointer to the ERP
+ */
+static void
+dasd_3990_erp_alternate_path(struct dasd_ccw_req * erp)
+{
+	struct dasd_device *device = erp->device;
+	__u8 opm;
+
+	/* try alternate valid path */
+	opm = ccw_device_get_path_mask(device->cdev);
+	//FIXME: start with get_opm ?
+	if (erp->lpm == 0)
+		erp->lpm = LPM_ANYPATH & ~(erp->irb.esw.esw0.sublog.lpum);
+	else
+		erp->lpm &= ~(erp->irb.esw.esw0.sublog.lpum);
+
+	if ((erp->lpm & opm) != 0x00) {
+
+		DEV_MESSAGE(KERN_DEBUG, device,
+			    "try alternate lpm=%x (lpum=%x / opm=%x)",
+			    erp->lpm, erp->irb.esw.esw0.sublog.lpum, opm);
+
+		/* reset status to queued to handle the request again... */
+		if (erp->status > DASD_CQR_QUEUED)
+			erp->status = DASD_CQR_QUEUED;
+		erp->retries = 1;
+	} else {
+		DEV_MESSAGE(KERN_ERR, device,
+			    "No alternate channel path left (lpum=%x / "
+			    "opm=%x) -> permanent error",
+			    erp->irb.esw.esw0.sublog.lpum, opm);
+
+		/* post request with permanent error */
+		if (erp->status > DASD_CQR_QUEUED)
+			erp->status = DASD_CQR_FAILED;
+	}
+}				/* end dasd_3990_erp_alternate_path */
+
+/*
+ * DASD_3990_ERP_DCTL
+ *
+ * DESCRIPTION
+ *   Setup cqr to do the Diagnostic Control (DCTL) command with an 
+ *   Inhibit Write subcommand (0x20) and the given modifier.
+ *
+ *  PARAMETER
+ *   erp		pointer to the current (failed) ERP
+ *   modifier		subcommand modifier
+ *   
+ * RETURN VALUES
+ *   dctl_cqr		pointer to NEW dctl_cqr 
+ *
+ */
+static struct dasd_ccw_req *
+dasd_3990_erp_DCTL(struct dasd_ccw_req * erp, char modifier)
+{
+
+	struct dasd_device *device = erp->device;
+	struct DCTL_data *DCTL_data;
+	struct ccw1 *ccw;
+	struct dasd_ccw_req *dctl_cqr;
+
+	dctl_cqr = dasd_alloc_erp_request((char *) &erp->magic, 1,
+					  sizeof (struct DCTL_data),
+					  erp->device);
+	if (IS_ERR(dctl_cqr)) {
+		DEV_MESSAGE(KERN_ERR, device, "%s",
+			    "Unable to allocate DCTL-CQR");
+		erp->status = DASD_CQR_FAILED;
+		return erp;
+	}
+
+	DCTL_data = dctl_cqr->data;
+
+	DCTL_data->subcommand = 0x02;	/* Inhibit Write */
+	DCTL_data->modifier = modifier;
+
+	ccw = dctl_cqr->cpaddr;
+	memset(ccw, 0, sizeof (struct ccw1));
+	ccw->cmd_code = CCW_CMD_DCTL;
+	ccw->count = 4;
+	ccw->cda = (__u32)(addr_t) DCTL_data;
+	dctl_cqr->function = dasd_3990_erp_DCTL;
+	dctl_cqr->refers = erp;
+	dctl_cqr->device = erp->device;
+	dctl_cqr->magic = erp->magic;
+	dctl_cqr->expires = 5 * 60 * HZ;
+	dctl_cqr->retries = 2;
+
+	dctl_cqr->buildclk = get_clock();
+
+	dctl_cqr->status = DASD_CQR_FILLED;
+
+	return dctl_cqr;
+
+}				/* end dasd_3990_erp_DCTL */
+
+/*
+ * DASD_3990_ERP_ACTION_1 
+ *
+ * DESCRIPTION
+ *   Setup ERP to do the ERP action 1 (see Reference manual).
+ *   Repeat the operation on a different channel path.
+ *   If all alternate paths have been tried, the request is posted with a
+ *   permanent error.
+ *   Note: duplex handling is not implemented (yet).
+ *
+ *  PARAMETER
+ *   erp		pointer to the current ERP
+ *
+ * RETURN VALUES
+ *   erp		pointer to the ERP
+ *
+ */
+static struct dasd_ccw_req *
+dasd_3990_erp_action_1(struct dasd_ccw_req * erp)
+{
+
+	erp->function = dasd_3990_erp_action_1;
+
+	dasd_3990_erp_alternate_path(erp);
+
+	return erp;
+
+}				/* end dasd_3990_erp_action_1 */
+
+/*
+ * DASD_3990_ERP_ACTION_4 
+ *
+ * DESCRIPTION
+ *   Setup ERP to do the ERP action 4 (see Reference manual).
+ *   Set the current request to PENDING to block the CQR queue for that device
+ *   until the state change interrupt appears.
+ *   Use a timer (20 seconds) to retry the cqr if the interrupt is still
+ *   missing.
+ *
+ *  PARAMETER
+ *   sense		sense data of the actual error
+ *   erp		pointer to the current ERP
+ *
+ * RETURN VALUES
+ *   erp		pointer to the ERP
+ *
+ */
+static struct dasd_ccw_req *
+dasd_3990_erp_action_4(struct dasd_ccw_req * erp, char *sense)
+{
+
+	struct dasd_device *device = erp->device;
+
+	/* first time set initial retry counter and erp_function    */
+	/* and retry once without waiting for state change pending  */
+	/* interrupt (this enables easier enqueing of the cqr)	    */
+	if (erp->function != dasd_3990_erp_action_4) {
+
+		DEV_MESSAGE(KERN_INFO, device, "%s",
+			    "dasd_3990_erp_action_4: first time retry");
+
+		erp->retries = 256;
+		erp->function = dasd_3990_erp_action_4;
+
+	} else {
+
+		if (sense[25] == 0x1D) {	/* state change pending */
+
+			DEV_MESSAGE(KERN_INFO, device, 
+				    "waiting for state change pending "
+				    "interrupt, %d retries left",
+				    erp->retries);
+			
+			dasd_3990_erp_block_queue(erp, 30*HZ);
+
+                } else if (sense[25] == 0x1E) {	/* busy */
+			DEV_MESSAGE(KERN_INFO, device,
+				    "busy - redriving request later, "
+				    "%d retries left",
+				    erp->retries);
+                        dasd_3990_erp_block_queue(erp, HZ);
+		} else {
+
+			/* no state change pending - retry */
+			DEV_MESSAGE (KERN_INFO, device, 
+				     "redriving request immediately, "
+				     "%d retries left", 
+				     erp->retries);
+			erp->status = DASD_CQR_QUEUED;
+		}
+	}
+
+	return erp;
+
+}				/* end dasd_3990_erp_action_4 */
+
+/*
+ ***************************************************************************** 
+ * 24 byte sense ERP functions (only)
+ ***************************************************************************** 
+ */
+
+/*
+ * DASD_3990_ERP_ACTION_5 
+ *
+ * DESCRIPTION
+ *   Setup ERP to do the ERP action 5 (see Reference manual).
+ *   NOTE: Further handling is done in xxx_further_erp after the retries.
+ *
+ *  PARAMETER
+ *   erp		pointer to the current ERP
+ *
+ * RETURN VALUES
+ *   erp		pointer to the ERP
+ *
+ */
+static struct dasd_ccw_req *
+dasd_3990_erp_action_5(struct dasd_ccw_req * erp)
+{
+
+	/* first of all retry */
+	erp->retries = 10;
+	erp->function = dasd_3990_erp_action_5;
+
+	return erp;
+
+}				/* end dasd_3990_erp_action_5 */
+
+/*
+ * DASD_3990_HANDLE_ENV_DATA
+ *
+ * DESCRIPTION
+ *   Handles 24 byte 'Environmental data present'.
+ *   Does a analysis of the sense data (message Format)
+ *   and prints the error messages.
+ *
+ * PARAMETER
+ *   sense		current sense data
+ *   
+ * RETURN VALUES
+ *   void
+ */
+static void
+dasd_3990_handle_env_data(struct dasd_ccw_req * erp, char *sense)
+{
+
+	struct dasd_device *device = erp->device;
+	char msg_format = (sense[7] & 0xF0);
+	char msg_no = (sense[7] & 0x0F);
+
+	switch (msg_format) {
+	case 0x00:		/* Format 0 - Program or System Checks */
+
+		if (sense[1] & 0x10) {	/* check message to operator bit */
+
+			switch (msg_no) {
+			case 0x00:	/* No Message */
+				break;
+			case 0x01:
+				DEV_MESSAGE(KERN_WARNING, device, "%s",
+					    "FORMAT 0 - Invalid Command");
+				break;
+			case 0x02:
+				DEV_MESSAGE(KERN_WARNING, device, "%s",
+					    "FORMAT 0 - Invalid Command "
+					    "Sequence");
+				break;
+			case 0x03:
+				DEV_MESSAGE(KERN_WARNING, device, "%s",
+					    "FORMAT 0 - CCW Count less than "
+					    "required");
+				break;
+			case 0x04:
+				DEV_MESSAGE(KERN_WARNING, device, "%s",
+					    "FORMAT 0 - Invalid Parameter");
+				break;
+			case 0x05:
+				DEV_MESSAGE(KERN_WARNING, device, "%s",
+					    "FORMAT 0 - Diagnostic of Sepecial"
+					    " Command Violates File Mask");
+				break;
+			case 0x07:
+				DEV_MESSAGE(KERN_WARNING, device, "%s",
+					    "FORMAT 0 - Channel Returned with "
+					    "Incorrect retry CCW");
+				break;
+			case 0x08:
+				DEV_MESSAGE(KERN_WARNING, device, "%s",
+					    "FORMAT 0 - Reset Notification");
+				break;
+			case 0x09:
+				DEV_MESSAGE(KERN_WARNING, device, "%s",
+					    "FORMAT 0 - Storage Path Restart");
+				break;
+			case 0x0A:
+				DEV_MESSAGE(KERN_WARNING, device,
+					    "FORMAT 0 - Channel requested "
+					    "... %02x", sense[8]);
+				break;
+			case 0x0B:
+				DEV_MESSAGE(KERN_WARNING, device, "%s",
+					    "FORMAT 0 - Invalid Defective/"
+					    "Alternate Track Pointer");
+				break;
+			case 0x0C:
+				DEV_MESSAGE(KERN_WARNING, device, "%s",
+					    "FORMAT 0 - DPS Installation "
+					    "Check");
+				break;
+			case 0x0E:
+				DEV_MESSAGE(KERN_WARNING, device, "%s",
+					    "FORMAT 0 - Command Invalid on "
+					    "Secondary Address");
+				break;
+			case 0x0F:
+				DEV_MESSAGE(KERN_WARNING, device,
+					    "FORMAT 0 - Status Not As "
+					    "Required: reason %02x", sense[8]);
+				break;
+			default:
+				DEV_MESSAGE(KERN_WARNING, device, "%s",
+					    "FORMAT 0 - Reseved");
+			}
+		} else {
+			switch (msg_no) {
+			case 0x00:	/* No Message */
+				break;
+			case 0x01:
+				DEV_MESSAGE(KERN_WARNING, device, "%s",
+					    "FORMAT 0 - Device Error Source");
+				break;
+			case 0x02:
+				DEV_MESSAGE(KERN_WARNING, device, "%s",
+					    "FORMAT 0 - Reserved");
+				break;
+			case 0x03:
+				DEV_MESSAGE(KERN_WARNING, device,
+					    "FORMAT 0 - Device Fenced - "
+					    "device = %02x", sense[4]);
+				break;
+			case 0x04:
+				DEV_MESSAGE(KERN_WARNING, device, "%s",
+					    "FORMAT 0 - Data Pinned for "
+					    "Device");
+				break;
+			default:
+				DEV_MESSAGE(KERN_WARNING, device, "%s",
+					    "FORMAT 0 - Reserved");
+			}
+		}
+		break;
+
+	case 0x10:		/* Format 1 - Device Equipment Checks */
+		switch (msg_no) {
+		case 0x00:	/* No Message */
+			break;
+		case 0x01:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 1 - Device Status 1 not as "
+				    "expected");
+			break;
+		case 0x03:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 1 - Index missing");
+			break;
+		case 0x04:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 1 - Interruption cannot be reset");
+			break;
+		case 0x05:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 1 - Device did not respond to "
+				    "selection");
+			break;
+		case 0x06:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 1 - Device check-2 error or Set "
+				    "Sector is not complete");
+			break;
+		case 0x07:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 1 - Head address does not "
+				    "compare");
+			break;
+		case 0x08:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 1 - Device status 1 not valid");
+			break;
+		case 0x09:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 1 - Device not ready");
+			break;
+		case 0x0A:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 1 - Track physical address did "
+				    "not compare");
+			break;
+		case 0x0B:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 1 - Missing device address bit");
+			break;
+		case 0x0C:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 1 - Drive motor switch is off");
+			break;
+		case 0x0D:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 1 - Seek incomplete");
+			break;
+		case 0x0E:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 1 - Cylinder address did not "
+				    "compare");
+			break;
+		case 0x0F:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 1 - Offset active cannot be "
+				    "reset");
+			break;
+		default:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 1 - Reserved");
+		}
+		break;
+
+	case 0x20:		/* Format 2 - 3990 Equipment Checks */
+		switch (msg_no) {
+		case 0x08:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 2 - 3990 check-2 error");
+			break;
+		case 0x0E:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 2 - Support facility errors");
+			break;
+		case 0x0F:
+			DEV_MESSAGE(KERN_WARNING, device,
+				    "FORMAT 2 - Microcode detected error %02x",
+				    sense[8]);
+			break;
+		default:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 2 - Reserved");
+		}
+		break;
+
+	case 0x30:		/* Format 3 - 3990 Control Checks */
+		switch (msg_no) {
+		case 0x0F:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 3 - Allegiance terminated");
+			break;
+		default:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 3 - Reserved");
+		}
+		break;
+
+	case 0x40:		/* Format 4 - Data Checks */
+		switch (msg_no) {
+		case 0x00:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 4 - Home address area error");
+			break;
+		case 0x01:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 4 - Count area error");
+			break;
+		case 0x02:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 4 - Key area error");
+			break;
+		case 0x03:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 4 - Data area error");
+			break;
+		case 0x04:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 4 - No sync byte in home address "
+				    "area");
+			break;
+		case 0x05:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 4 - No sync byte in count address "
+				    "area");
+			break;
+		case 0x06:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 4 - No sync byte in key area");
+			break;
+		case 0x07:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 4 - No sync byte in data area");
+			break;
+		case 0x08:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 4 - Home address area error; "
+				    "offset active");
+			break;
+		case 0x09:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 4 - Count area error; offset "
+				    "active");
+			break;
+		case 0x0A:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 4 - Key area error; offset "
+				    "active");
+			break;
+		case 0x0B:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 4 - Data area error; "
+				    "offset active");
+			break;
+		case 0x0C:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 4 - No sync byte in home "
+				    "address area; offset active");
+			break;
+		case 0x0D:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 4 - No syn byte in count "
+				    "address area; offset active");
+			break;
+		case 0x0E:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 4 - No sync byte in key area; "
+				    "offset active");
+			break;
+		case 0x0F:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 4 - No syn byte in data area; "
+				    "offset active");
+			break;
+		default:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 4 - Reserved");
+		}
+		break;
+
+	case 0x50:  /* Format 5 - Data Check with displacement information */
+		switch (msg_no) {
+		case 0x00:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 5 - Data Check in the "
+				    "home address area");
+			break;
+		case 0x01:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 5 - Data Check in the count area");
+			break;
+		case 0x02:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 5 - Data Check in the key area");
+			break;
+		case 0x03:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 5 - Data Check in the data area");
+			break;
+		case 0x08:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 5 - Data Check in the "
+				    "home address area; offset active");
+			break;
+		case 0x09:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 5 - Data Check in the count area; "
+				    "offset active");
+			break;
+		case 0x0A:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 5 - Data Check in the key area; "
+				    "offset active");
+			break;
+		case 0x0B:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 5 - Data Check in the data area; "
+				    "offset active");
+			break;
+		default:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 5 - Reserved");
+		}
+		break;
+
+	case 0x60:  /* Format 6 - Usage Statistics/Overrun Errors */
+		switch (msg_no) {
+		case 0x00:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 6 - Overrun on channel A");
+			break;
+		case 0x01:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 6 - Overrun on channel B");
+			break;
+		case 0x02:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 6 - Overrun on channel C");
+			break;
+		case 0x03:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 6 - Overrun on channel D");
+			break;
+		case 0x04:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 6 - Overrun on channel E");
+			break;
+		case 0x05:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 6 - Overrun on channel F");
+			break;
+		case 0x06:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 6 - Overrun on channel G");
+			break;
+		case 0x07:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 6 - Overrun on channel H");
+			break;
+		default:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 6 - Reserved");
+		}
+		break;
+
+	case 0x70:  /* Format 7 - Device Connection Control Checks */
+		switch (msg_no) {
+		case 0x00:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 7 - RCC initiated by a connection "
+				    "check alert");
+			break;
+		case 0x01:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 7 - RCC 1 sequence not "
+				    "successful");
+			break;
+		case 0x02:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 7 - RCC 1 and RCC 2 sequences not "
+				    "successful");
+			break;
+		case 0x03:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 7 - Invalid tag-in during "
+				    "selection sequence");
+			break;
+		case 0x04:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 7 - extra RCC required");
+			break;
+		case 0x05:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 7 - Invalid DCC selection "
+				    "response or timeout");
+			break;
+		case 0x06:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 7 - Missing end operation; device "
+				    "transfer complete");
+			break;
+		case 0x07:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 7 - Missing end operation; device "
+				    "transfer incomplete");
+			break;
+		case 0x08:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 7 - Invalid tag-in for an "
+				    "immediate command sequence");
+			break;
+		case 0x09:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 7 - Invalid tag-in for an "
+				    "extended command sequence");
+			break;
+		case 0x0A:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 7 - 3990 microcode time out when "
+				    "stopping selection");
+			break;
+		case 0x0B:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 7 - No response to selection "
+				    "after a poll interruption");
+			break;
+		case 0x0C:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 7 - Permanent path error (DASD "
+				    "controller not available)");
+			break;
+		case 0x0D:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 7 - DASD controller not available"
+				    " on disconnected command chain");
+			break;
+		default:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 7 - Reserved");
+		}
+		break;
+
+	case 0x80:  /* Format 8 - Additional Device Equipment Checks */
+		switch (msg_no) {
+		case 0x00:	/* No Message */
+		case 0x01:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 8 - Error correction code "
+				    "hardware fault");
+			break;
+		case 0x03:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 8 - Unexpected end operation "
+				    "response code");
+			break;
+		case 0x04:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 8 - End operation with transfer "
+				    "count not zero");
+			break;
+		case 0x05:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 8 - End operation with transfer "
+				    "count zero");
+			break;
+		case 0x06:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 8 - DPS checks after a system "
+				    "reset or selective reset");
+			break;
+		case 0x07:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 8 - DPS cannot be filled");
+			break;
+		case 0x08:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 8 - Short busy time-out during "
+				    "device selection");
+			break;
+		case 0x09:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 8 - DASD controller failed to "
+				    "set or reset the long busy latch");
+			break;
+		case 0x0A:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 8 - No interruption from device "
+				    "during a command chain");
+			break;
+		default:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 8 - Reserved");
+		}
+		break;
+
+	case 0x90:  /* Format 9 - Device Read, Write, and Seek Checks */
+		switch (msg_no) {
+		case 0x00:
+			break;	/* No Message */
+		case 0x06:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 9 - Device check-2 error");
+			break;
+		case 0x07:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 9 - Head address did not compare");
+			break;
+		case 0x0A:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 9 - Track physical address did "
+				    "not compare while oriented");
+			break;
+		case 0x0E:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 9 - Cylinder address did not "
+				    "compare");
+			break;
+		default:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT 9 - Reserved");
+		}
+		break;
+
+	case 0xF0:		/* Format F - Cache Storage Checks */
+		switch (msg_no) {
+		case 0x00:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT F - Operation Terminated");
+			break;
+		case 0x01:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT F - Subsystem Processing Error");
+			break;
+		case 0x02:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT F - Cache or nonvolatile storage "
+				    "equipment failure");
+			break;
+		case 0x04:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT F - Caching terminated");
+			break;
+		case 0x06:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT F - Cache fast write access not "
+				    "authorized");
+			break;
+		case 0x07:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT F - Track format incorrect");
+			break;
+		case 0x09:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT F - Caching reinitiated");
+			break;
+		case 0x0A:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT F - Nonvolatile storage "
+				    "terminated");
+			break;
+		case 0x0B:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT F - Volume is suspended duplex");
+			break;
+		case 0x0C:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT F - Subsystem status connot be "
+				    "determined");
+			break;
+		case 0x0D:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT F - Caching status reset to "
+				    "default");
+			break;
+		case 0x0E:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT F - DASD Fast Write inhibited");
+			break;
+		default:
+			DEV_MESSAGE(KERN_WARNING, device, "%s",
+				    "FORMAT D - Reserved");
+		}
+		break;
+
+	default:	/* unknown message format - should not happen */
+	        DEV_MESSAGE (KERN_WARNING, device,
+                             "unknown message format %02x",
+                             msg_format);
+		break;
+	}			/* end switch message format */
+
+}				/* end dasd_3990_handle_env_data */
+
+/*
+ * DASD_3990_ERP_COM_REJ
+ *
+ * DESCRIPTION
+ *   Handles 24 byte 'Command Reject' error.
+ *
+ * PARAMETER
+ *   erp		current erp_head
+ *   sense		current sense data
+ * 
+ * RETURN VALUES
+ *   erp		'new' erp_head - pointer to new ERP 
+ */
+static struct dasd_ccw_req *
+dasd_3990_erp_com_rej(struct dasd_ccw_req * erp, char *sense)
+{
+
+	struct dasd_device *device = erp->device;
+
+	erp->function = dasd_3990_erp_com_rej;
+
+	/* env data present (ACTION 10 - retry should work) */
+	if (sense[2] & SNS2_ENV_DATA_PRESENT) {
+
+		DEV_MESSAGE(KERN_DEBUG, device, "%s",
+			    "Command Reject - environmental data present");
+
+		dasd_3990_handle_env_data(erp, sense);
+
+		erp->retries = 5;
+
+	} else {
+		/* fatal error -  set status to FAILED */
+		DEV_MESSAGE(KERN_ERR, device, "%s",
+			    "Command Reject - Fatal error");
+
+		erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
+	}
+
+	return erp;
+
+}				/* end dasd_3990_erp_com_rej */
+
+/*
+ * DASD_3990_ERP_BUS_OUT 
+ *
+ * DESCRIPTION
+ *   Handles 24 byte 'Bus Out Parity Check' error.
+ *
+ * PARAMETER
+ *   erp		current erp_head
+ * RETURN VALUES
+ *   erp		new erp_head - pointer to new ERP
+ */
+static struct dasd_ccw_req *
+dasd_3990_erp_bus_out(struct dasd_ccw_req * erp)
+{
+
+	struct dasd_device *device = erp->device;
+
+	/* first time set initial retry counter and erp_function */
+	/* and retry once without blocking queue		 */
+	/* (this enables easier enqueing of the cqr)		 */
+	if (erp->function != dasd_3990_erp_bus_out) {
+		erp->retries = 256;
+		erp->function = dasd_3990_erp_bus_out;
+
+	} else {
+
+		/* issue a message and wait for 'device ready' interrupt */
+		DEV_MESSAGE(KERN_DEBUG, device, "%s",
+			    "bus out parity error or BOPC requested by "
+			    "channel");
+
+		dasd_3990_erp_block_queue(erp, 60*HZ);
+
+	}
+
+	return erp;
+
+}				/* end dasd_3990_erp_bus_out */
+
+/*
+ * DASD_3990_ERP_EQUIP_CHECK
+ *
+ * DESCRIPTION
+ *   Handles 24 byte 'Equipment Check' error.
+ *
+ * PARAMETER
+ *   erp		current erp_head
+ * RETURN VALUES
+ *   erp		new erp_head - pointer to new ERP
+ */
+static struct dasd_ccw_req *
+dasd_3990_erp_equip_check(struct dasd_ccw_req * erp, char *sense)
+{
+
+	struct dasd_device *device = erp->device;
+
+	erp->function = dasd_3990_erp_equip_check;
+
+	if (sense[1] & SNS1_WRITE_INHIBITED) {
+
+		DEV_MESSAGE(KERN_DEBUG, device, "%s",
+			    "Write inhibited path encountered");
+
+		/* vary path offline */
+		DEV_MESSAGE(KERN_ERR, device, "%s",
+			    "Path should be varied off-line. "
+			    "This is not implemented yet \n - please report "
+			    "to linux390@de.ibm.com");
+
+		erp = dasd_3990_erp_action_1(erp);
+
+	} else if (sense[2] & SNS2_ENV_DATA_PRESENT) {
+
+		DEV_MESSAGE(KERN_DEBUG, device, "%s",
+			    "Equipment Check - " "environmental data present");
+
+		dasd_3990_handle_env_data(erp, sense);
+
+		erp = dasd_3990_erp_action_4(erp, sense);
+
+	} else if (sense[1] & SNS1_PERM_ERR) {
+
+		DEV_MESSAGE(KERN_DEBUG, device, "%s",
+			    "Equipment Check - retry exhausted or "
+			    "undesirable");
+
+		erp = dasd_3990_erp_action_1(erp);
+
+	} else {
+		/* all other equipment checks - Action 5 */
+		/* rest is done when retries == 0 */
+		DEV_MESSAGE(KERN_DEBUG, device, "%s",
+			    "Equipment check or processing error");
+
+		erp = dasd_3990_erp_action_5(erp);
+	}
+
+	return erp;
+
+}				/* end dasd_3990_erp_equip_check */
+
+/*
+ * DASD_3990_ERP_DATA_CHECK
+ *
+ * DESCRIPTION
+ *   Handles 24 byte 'Data Check' error.
+ *
+ * PARAMETER
+ *   erp		current erp_head
+ * RETURN VALUES
+ *   erp		new erp_head - pointer to new ERP
+ */
+static struct dasd_ccw_req *
+dasd_3990_erp_data_check(struct dasd_ccw_req * erp, char *sense)
+{
+
+	struct dasd_device *device = erp->device;
+
+	erp->function = dasd_3990_erp_data_check;
+
+	if (sense[2] & SNS2_CORRECTABLE) {	/* correctable data check */
+
+		/* issue message that the data has been corrected */
+		DEV_MESSAGE(KERN_EMERG, device, "%s",
+			    "Data recovered during retry with PCI "
+			    "fetch mode active");
+
+		/* not possible to handle this situation in Linux */
+		panic("No way to inform application about the possibly "
+		      "incorrect data");
+
+	} else if (sense[2] & SNS2_ENV_DATA_PRESENT) {
+
+		DEV_MESSAGE(KERN_DEBUG, device, "%s",
+			    "Uncorrectable data check recovered secondary "
+			    "addr of duplex pair");
+
+		erp = dasd_3990_erp_action_4(erp, sense);
+
+	} else if (sense[1] & SNS1_PERM_ERR) {
+
+		DEV_MESSAGE(KERN_DEBUG, device, "%s",
+			    "Uncorrectable data check with internal "
+			    "retry exhausted");
+
+		erp = dasd_3990_erp_action_1(erp);
+
+	} else {
+		/* all other data checks */
+		DEV_MESSAGE(KERN_DEBUG, device, "%s",
+			    "Uncorrectable data check with retry count "
+			    "exhausted...");
+
+		erp = dasd_3990_erp_action_5(erp);
+	}
+
+	return erp;
+
+}				/* end dasd_3990_erp_data_check */
+
+/*
+ * DASD_3990_ERP_OVERRUN
+ *
+ * DESCRIPTION
+ *   Handles 24 byte 'Overrun' error.
+ *
+ * PARAMETER
+ *   erp		current erp_head
+ * RETURN VALUES
+ *   erp		new erp_head - pointer to new ERP
+ */
+static struct dasd_ccw_req *
+dasd_3990_erp_overrun(struct dasd_ccw_req * erp, char *sense)
+{
+
+	struct dasd_device *device = erp->device;
+
+	erp->function = dasd_3990_erp_overrun;
+
+	DEV_MESSAGE(KERN_DEBUG, device, "%s",
+		    "Overrun - service overrun or overrun"
+		    " error requested by channel");
+
+	erp = dasd_3990_erp_action_5(erp);
+
+	return erp;
+
+}				/* end dasd_3990_erp_overrun */
+
+/*
+ * DASD_3990_ERP_INV_FORMAT
+ *
+ * DESCRIPTION
+ *   Handles 24 byte 'Invalid Track Format' error.
+ *
+ * PARAMETER
+ *   erp		current erp_head
+ * RETURN VALUES
+ *   erp		new erp_head - pointer to new ERP
+ */
+static struct dasd_ccw_req *
+dasd_3990_erp_inv_format(struct dasd_ccw_req * erp, char *sense)
+{
+
+	struct dasd_device *device = erp->device;
+
+	erp->function = dasd_3990_erp_inv_format;
+
+	if (sense[2] & SNS2_ENV_DATA_PRESENT) {
+
+		DEV_MESSAGE(KERN_DEBUG, device, "%s",
+			    "Track format error when destaging or "
+			    "staging data");
+
+		dasd_3990_handle_env_data(erp, sense);
+
+		erp = dasd_3990_erp_action_4(erp, sense);
+
+	} else {
+		DEV_MESSAGE(KERN_ERR, device, "%s",
+			    "Invalid Track Format - Fatal error should have "
+			    "been handled within the interrupt handler");
+
+		erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
+	}
+
+	return erp;
+
+}				/* end dasd_3990_erp_inv_format */
+
+/*
+ * DASD_3990_ERP_EOC
+ *
+ * DESCRIPTION
+ *   Handles 24 byte 'End-of-Cylinder' error.
+ *
+ * PARAMETER
+ *   erp		already added default erp
+ * RETURN VALUES
+ *   erp		pointer to original (failed) cqr.
+ */
+static struct dasd_ccw_req *
+dasd_3990_erp_EOC(struct dasd_ccw_req * default_erp, char *sense)
+{
+
+	struct dasd_device *device = default_erp->device;
+
+	DEV_MESSAGE(KERN_ERR, device, "%s",
+		    "End-of-Cylinder - must never happen");
+
+	/* implement action 7 - BUG */
+	return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED);
+
+}				/* end dasd_3990_erp_EOC */
+
+/*
+ * DASD_3990_ERP_ENV_DATA
+ *
+ * DESCRIPTION
+ *   Handles 24 byte 'Environmental-Data Present' error.
+ *
+ * PARAMETER
+ *   erp		current erp_head
+ * RETURN VALUES
+ *   erp		new erp_head - pointer to new ERP
+ */
+static struct dasd_ccw_req *
+dasd_3990_erp_env_data(struct dasd_ccw_req * erp, char *sense)
+{
+
+	struct dasd_device *device = erp->device;
+
+	erp->function = dasd_3990_erp_env_data;
+
+	DEV_MESSAGE(KERN_DEBUG, device, "%s", "Environmental data present");
+
+	dasd_3990_handle_env_data(erp, sense);
+
+	/* don't retry on disabled interface */
+	if (sense[7] != 0x0F) {
+
+		erp = dasd_3990_erp_action_4(erp, sense);
+	} else {
+
+		erp = dasd_3990_erp_cleanup(erp, DASD_CQR_IN_IO);
+	}
+
+	return erp;
+
+}				/* end dasd_3990_erp_env_data */
+
+/*
+ * DASD_3990_ERP_NO_REC
+ *
+ * DESCRIPTION
+ *   Handles 24 byte 'No Record Found' error.
+ *
+ * PARAMETER
+ *   erp		already added default ERP
+ *		
+ * RETURN VALUES
+ *   erp		new erp_head - pointer to new ERP
+ */
+static struct dasd_ccw_req *
+dasd_3990_erp_no_rec(struct dasd_ccw_req * default_erp, char *sense)
+{
+
+	struct dasd_device *device = default_erp->device;
+
+	DEV_MESSAGE(KERN_ERR, device, "%s",
+		    "No Record Found - Fatal error should "
+		    "have been handled within the interrupt handler");
+
+	return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED);
+
+}				/* end dasd_3990_erp_no_rec */
+
+/*
+ * DASD_3990_ERP_FILE_PROT
+ *
+ * DESCRIPTION
+ *   Handles 24 byte 'File Protected' error.
+ *   Note: Seek related recovery is not implemented because
+ *	   wee don't use the seek command yet.
+ *
+ * PARAMETER
+ *   erp		current erp_head
+ * RETURN VALUES
+ *   erp		new erp_head - pointer to new ERP
+ */
+static struct dasd_ccw_req *
+dasd_3990_erp_file_prot(struct dasd_ccw_req * erp)
+{
+
+	struct dasd_device *device = erp->device;
+
+	DEV_MESSAGE(KERN_ERR, device, "%s", "File Protected");
+
+	return dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
+
+}				/* end dasd_3990_erp_file_prot */
+
+/*
+ * DASD_3990_ERP_INSPECT_24 
+ *
+ * DESCRIPTION
+ *   Does a detailed inspection of the 24 byte sense data
+ *   and sets up a related error recovery action.  
+ *
+ * PARAMETER
+ *   sense		sense data of the actual error
+ *   erp		pointer to the currently created default ERP
+ *
+ * RETURN VALUES
+ *   erp		pointer to the (addtitional) ERP
+ */
+static struct dasd_ccw_req *
+dasd_3990_erp_inspect_24(struct dasd_ccw_req * erp, char *sense)
+{
+
+	struct dasd_ccw_req *erp_filled = NULL;
+
+	/* Check sense for ....	   */
+	/* 'Command Reject'	   */
+	if ((erp_filled == NULL) && (sense[0] & SNS0_CMD_REJECT)) {
+		erp_filled = dasd_3990_erp_com_rej(erp, sense);
+	}
+	/* 'Intervention Required' */
+	if ((erp_filled == NULL) && (sense[0] & SNS0_INTERVENTION_REQ)) {
+		erp_filled = dasd_3990_erp_int_req(erp);
+	}
+	/* 'Bus Out Parity Check'  */
+	if ((erp_filled == NULL) && (sense[0] & SNS0_BUS_OUT_CHECK)) {
+		erp_filled = dasd_3990_erp_bus_out(erp);
+	}
+	/* 'Equipment Check'	   */
+	if ((erp_filled == NULL) && (sense[0] & SNS0_EQUIPMENT_CHECK)) {
+		erp_filled = dasd_3990_erp_equip_check(erp, sense);
+	}
+	/* 'Data Check'		   */
+	if ((erp_filled == NULL) && (sense[0] & SNS0_DATA_CHECK)) {
+		erp_filled = dasd_3990_erp_data_check(erp, sense);
+	}
+	/* 'Overrun'		   */
+	if ((erp_filled == NULL) && (sense[0] & SNS0_OVERRUN)) {
+		erp_filled = dasd_3990_erp_overrun(erp, sense);
+	}
+	/* 'Invalid Track Format'  */
+	if ((erp_filled == NULL) && (sense[1] & SNS1_INV_TRACK_FORMAT)) {
+		erp_filled = dasd_3990_erp_inv_format(erp, sense);
+	}
+	/* 'End-of-Cylinder'	   */
+	if ((erp_filled == NULL) && (sense[1] & SNS1_EOC)) {
+		erp_filled = dasd_3990_erp_EOC(erp, sense);
+	}
+	/* 'Environmental Data'	   */
+	if ((erp_filled == NULL) && (sense[2] & SNS2_ENV_DATA_PRESENT)) {
+		erp_filled = dasd_3990_erp_env_data(erp, sense);
+	}
+	/* 'No Record Found'	   */
+	if ((erp_filled == NULL) && (sense[1] & SNS1_NO_REC_FOUND)) {
+		erp_filled = dasd_3990_erp_no_rec(erp, sense);
+	}
+	/* 'File Protected'	   */
+	if ((erp_filled == NULL) && (sense[1] & SNS1_FILE_PROTECTED)) {
+		erp_filled = dasd_3990_erp_file_prot(erp);
+	}
+	/* other (unknown) error - do default ERP */
+	if (erp_filled == NULL) {
+
+		erp_filled = erp;
+	}
+
+	return erp_filled;
+
+}				/* END dasd_3990_erp_inspect_24 */
+
+/*
+ ***************************************************************************** 
+ * 32 byte sense ERP functions (only)
+ ***************************************************************************** 
+ */
+
+/*
+ * DASD_3990_ERPACTION_10_32 
+ *
+ * DESCRIPTION
+ *   Handles 32 byte 'Action 10' of Single Program Action Codes.
+ *   Just retry and if retry doesn't work, return with error.
+ *
+ * PARAMETER
+ *   erp		current erp_head
+ *   sense		current sense data 
+ * RETURN VALUES
+ *   erp		modified erp_head
+ */
+static struct dasd_ccw_req *
+dasd_3990_erp_action_10_32(struct dasd_ccw_req * erp, char *sense)
+{
+
+	struct dasd_device *device = erp->device;
+
+	erp->retries = 256;
+	erp->function = dasd_3990_erp_action_10_32;
+
+	DEV_MESSAGE(KERN_DEBUG, device, "%s", "Perform logging requested");
+
+	return erp;
+
+}				/* end dasd_3990_erp_action_10_32 */
+
+/*
+ * DASD_3990_ERP_ACTION_1B_32
+ *
+ * DESCRIPTION
+ *   Handles 32 byte 'Action 1B' of Single Program Action Codes.
+ *   A write operation could not be finished because of an unexpected 
+ *   condition.
+ *   The already created 'default erp' is used to get the link to 
+ *   the erp chain, but it can not be used for this recovery 
+ *   action because it contains no DE/LO data space.
+ *
+ * PARAMETER
+ *   default_erp	already added default erp.
+ *   sense		current sense data 
+ *
+ * RETURN VALUES
+ *   erp		new erp or 
+ *			default_erp in case of imprecise ending or error
+ */
+static struct dasd_ccw_req *
+dasd_3990_erp_action_1B_32(struct dasd_ccw_req * default_erp, char *sense)
+{
+
+	struct dasd_device *device = default_erp->device;
+	__u32 cpa = 0;
+	struct dasd_ccw_req *cqr;
+	struct dasd_ccw_req *erp;
+	struct DE_eckd_data *DE_data;
+	char *LO_data;		/* LO_eckd_data_t */
+	struct ccw1 *ccw;
+
+	DEV_MESSAGE(KERN_DEBUG, device, "%s",
+		    "Write not finished because of unexpected condition");
+
+	default_erp->function = dasd_3990_erp_action_1B_32;
+
+	/* determine the original cqr */
+	cqr = default_erp;
+
+	while (cqr->refers != NULL) {
+		cqr = cqr->refers;
+	}
+
+	/* for imprecise ending just do default erp */
+	if (sense[1] & 0x01) {
+
+		DEV_MESSAGE(KERN_DEBUG, device, "%s",
+			    "Imprecise ending is set - just retry");
+
+		return default_erp;
+	}
+
+	/* determine the address of the CCW to be restarted */
+	/* Imprecise ending is not set -> addr from IRB-SCSW */
+	cpa = default_erp->refers->irb.scsw.cpa;
+
+	if (cpa == 0) {
+
+		DEV_MESSAGE(KERN_DEBUG, device, "%s",
+			    "Unable to determine address of the CCW "
+			    "to be restarted");
+
+		return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED);
+	}
+
+	/* Build new ERP request including DE/LO */
+	erp = dasd_alloc_erp_request((char *) &cqr->magic,
+				     2 + 1,/* DE/LO + TIC */
+				     sizeof (struct DE_eckd_data) +
+				     sizeof (struct LO_eckd_data), device);
+
+	if (IS_ERR(erp)) {
+		DEV_MESSAGE(KERN_ERR, device, "%s", "Unable to allocate ERP");
+		return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED);
+	}
+
+	/* use original DE */
+	DE_data = erp->data;
+	memcpy(DE_data, cqr->data, sizeof (struct DE_eckd_data));
+
+	/* create LO */
+	LO_data = erp->data + sizeof (struct DE_eckd_data);
+
+	if ((sense[3] == 0x01) && (LO_data[1] & 0x01)) {
+
+		DEV_MESSAGE(KERN_ERR, device, "%s",
+			    "BUG - this should not happen");
+
+		return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED);
+	}
+
+	if ((sense[7] & 0x3F) == 0x01) {
+		/* operation code is WRITE DATA -> data area orientation */
+		LO_data[0] = 0x81;
+
+	} else if ((sense[7] & 0x3F) == 0x03) {
+		/* operation code is FORMAT WRITE -> index orientation */
+		LO_data[0] = 0xC3;
+
+	} else {
+		LO_data[0] = sense[7];	/* operation */
+	}
+
+	LO_data[1] = sense[8];	/* auxiliary */
+	LO_data[2] = sense[9];
+	LO_data[3] = sense[3];	/* count */
+	LO_data[4] = sense[29];	/* seek_addr.cyl */
+	LO_data[5] = sense[30];	/* seek_addr.cyl 2nd byte */
+	LO_data[7] = sense[31];	/* seek_addr.head 2nd byte */
+
+	memcpy(&(LO_data[8]), &(sense[11]), 8);
+
+	/* create DE ccw */
+	ccw = erp->cpaddr;
+	memset(ccw, 0, sizeof (struct ccw1));
+	ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
+	ccw->flags = CCW_FLAG_CC;
+	ccw->count = 16;
+	ccw->cda = (__u32)(addr_t) DE_data;
+
+	/* create LO ccw */
+	ccw++;
+	memset(ccw, 0, sizeof (struct ccw1));
+	ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
+	ccw->flags = CCW_FLAG_CC;
+	ccw->count = 16;
+	ccw->cda = (__u32)(addr_t) LO_data;
+
+	/* TIC to the failed ccw */
+	ccw++;
+	ccw->cmd_code = CCW_CMD_TIC;
+	ccw->cda = cpa;
+
+	/* fill erp related fields */
+	erp->function = dasd_3990_erp_action_1B_32;
+	erp->refers = default_erp->refers;
+	erp->device = device;
+	erp->magic = default_erp->magic;
+	erp->expires = 0;
+	erp->retries = 256;
+	erp->buildclk = get_clock();
+	erp->status = DASD_CQR_FILLED;
+
+	/* remove the default erp */
+	dasd_free_erp_request(default_erp, device);
+
+	return erp;
+
+}				/* end dasd_3990_erp_action_1B_32 */
+
+/*
+ * DASD_3990_UPDATE_1B
+ *
+ * DESCRIPTION
+ *   Handles the update to the 32 byte 'Action 1B' of Single Program 
+ *   Action Codes in case the first action was not successful.
+ *   The already created 'previous_erp' is the currently not successful
+ *   ERP. 
+ *
+ * PARAMETER
+ *   previous_erp	already created previous erp.
+ *   sense		current sense data 
+ * RETURN VALUES
+ *   erp		modified erp 
+ */
+static struct dasd_ccw_req *
+dasd_3990_update_1B(struct dasd_ccw_req * previous_erp, char *sense)
+{
+
+	struct dasd_device *device = previous_erp->device;
+	__u32 cpa = 0;
+	struct dasd_ccw_req *cqr;
+	struct dasd_ccw_req *erp;
+	char *LO_data;		/* struct LO_eckd_data */
+	struct ccw1 *ccw;
+
+	DEV_MESSAGE(KERN_DEBUG, device, "%s",
+		    "Write not finished because of unexpected condition"
+		    " - follow on");
+
+	/* determine the original cqr */
+	cqr = previous_erp;
+
+	while (cqr->refers != NULL) {
+		cqr = cqr->refers;
+	}
+
+	/* for imprecise ending just do default erp */
+	if (sense[1] & 0x01) {
+
+		DEV_MESSAGE(KERN_DEBUG, device, "%s",
+			    "Imprecise ending is set - just retry");
+
+		previous_erp->status = DASD_CQR_QUEUED;
+
+		return previous_erp;
+	}
+
+	/* determine the address of the CCW to be restarted */
+	/* Imprecise ending is not set -> addr from IRB-SCSW */
+	cpa = previous_erp->irb.scsw.cpa;
+
+	if (cpa == 0) {
+
+		DEV_MESSAGE(KERN_DEBUG, device, "%s",
+			    "Unable to determine address of the CCW "
+			    "to be restarted");
+
+		previous_erp->status = DASD_CQR_FAILED;
+
+		return previous_erp;
+	}
+
+	erp = previous_erp;
+
+	/* update the LO with the new returned sense data  */
+	LO_data = erp->data + sizeof (struct DE_eckd_data);
+
+	if ((sense[3] == 0x01) && (LO_data[1] & 0x01)) {
+
+		DEV_MESSAGE(KERN_ERR, device, "%s",
+			    "BUG - this should not happen");
+
+		previous_erp->status = DASD_CQR_FAILED;
+
+		return previous_erp;
+	}
+
+	if ((sense[7] & 0x3F) == 0x01) {
+		/* operation code is WRITE DATA -> data area orientation */
+		LO_data[0] = 0x81;
+
+	} else if ((sense[7] & 0x3F) == 0x03) {
+		/* operation code is FORMAT WRITE -> index orientation */
+		LO_data[0] = 0xC3;
+
+	} else {
+		LO_data[0] = sense[7];	/* operation */
+	}
+
+	LO_data[1] = sense[8];	/* auxiliary */
+	LO_data[2] = sense[9];
+	LO_data[3] = sense[3];	/* count */
+	LO_data[4] = sense[29];	/* seek_addr.cyl */
+	LO_data[5] = sense[30];	/* seek_addr.cyl 2nd byte */
+	LO_data[7] = sense[31];	/* seek_addr.head 2nd byte */
+
+	memcpy(&(LO_data[8]), &(sense[11]), 8);
+
+	/* TIC to the failed ccw */
+	ccw = erp->cpaddr;	/* addr of DE ccw */
+	ccw++;			/* addr of LE ccw */
+	ccw++;			/* addr of TIC ccw */
+	ccw->cda = cpa;
+
+	erp->status = DASD_CQR_QUEUED;
+
+	return erp;
+
+}				/* end dasd_3990_update_1B */
+
+/*
+ * DASD_3990_ERP_COMPOUND_RETRY 
+ *
+ * DESCRIPTION
+ *   Handles the compound ERP action retry code.
+ *   NOTE: At least one retry is done even if zero is specified
+ *	   by the sense data. This makes enqueueing of the request
+ *	   easier.
+ *
+ * PARAMETER
+ *   sense		sense data of the actual error
+ *   erp		pointer to the currently created ERP
+ *
+ * RETURN VALUES
+ *   erp		modified ERP pointer
+ *
+ */
+static void
+dasd_3990_erp_compound_retry(struct dasd_ccw_req * erp, char *sense)
+{
+
+	switch (sense[25] & 0x03) {
+	case 0x00:		/* no not retry */
+		erp->retries = 1;
+		break;
+
+	case 0x01:		/* retry 2 times */
+		erp->retries = 2;
+		break;
+
+	case 0x02:		/* retry 10 times */
+		erp->retries = 10;
+		break;
+
+	case 0x03:		/* retry 256 times */
+		erp->retries = 256;
+		break;
+
+	default:
+		BUG();
+	}
+
+	erp->function = dasd_3990_erp_compound_retry;
+
+}				/* end dasd_3990_erp_compound_retry */
+
+/*
+ * DASD_3990_ERP_COMPOUND_PATH 
+ *
+ * DESCRIPTION
+ *   Handles the compound ERP action for retry on alternate
+ *   channel path.
+ *
+ * PARAMETER
+ *   sense		sense data of the actual error
+ *   erp		pointer to the currently created ERP
+ *
+ * RETURN VALUES
+ *   erp		modified ERP pointer
+ *
+ */
+static void
+dasd_3990_erp_compound_path(struct dasd_ccw_req * erp, char *sense)
+{
+
+	if (sense[25] & DASD_SENSE_BIT_3) {
+		dasd_3990_erp_alternate_path(erp);
+
+		if (erp->status == DASD_CQR_FAILED) {
+			/* reset the lpm and the status to be able to 
+			 * try further actions. */
+
+			erp->lpm = 0;
+
+			erp->status = DASD_CQR_ERROR;
+
+		}
+	}
+
+	erp->function = dasd_3990_erp_compound_path;
+
+}				/* end dasd_3990_erp_compound_path */
+
+/*
+ * DASD_3990_ERP_COMPOUND_CODE 
+ *
+ * DESCRIPTION
+ *   Handles the compound ERP action for retry code.
+ *
+ * PARAMETER
+ *   sense		sense data of the actual error
+ *   erp		pointer to the currently created ERP
+ *
+ * RETURN VALUES
+ *   erp		NEW ERP pointer
+ *
+ */
+static struct dasd_ccw_req *
+dasd_3990_erp_compound_code(struct dasd_ccw_req * erp, char *sense)
+{
+
+	if (sense[25] & DASD_SENSE_BIT_2) {
+
+		switch (sense[28]) {
+		case 0x17:
+			/* issue a Diagnostic Control command with an 
+			 * Inhibit Write subcommand and controler modifier */
+			erp = dasd_3990_erp_DCTL(erp, 0x20);
+			break;
+			
+		case 0x25:
+			/* wait for 5 seconds and retry again */
+			erp->retries = 1;
+			
+			dasd_3990_erp_block_queue (erp, 5*HZ);
+			break;
+			
+		default:
+			/* should not happen - continue */
+			break;
+		}
+	}
+
+	erp->function = dasd_3990_erp_compound_code;
+
+	return erp;
+
+}				/* end dasd_3990_erp_compound_code */
+
+/*
+ * DASD_3990_ERP_COMPOUND_CONFIG 
+ *
+ * DESCRIPTION
+ *   Handles the compound ERP action for configruation
+ *   dependent error.
+ *   Note: duplex handling is not implemented (yet).
+ *
+ * PARAMETER
+ *   sense		sense data of the actual error
+ *   erp		pointer to the currently created ERP
+ *
+ * RETURN VALUES
+ *   erp		modified ERP pointer
+ *
+ */
+static void
+dasd_3990_erp_compound_config(struct dasd_ccw_req * erp, char *sense)
+{
+
+	if ((sense[25] & DASD_SENSE_BIT_1) && (sense[26] & DASD_SENSE_BIT_2)) {
+
+		/* set to suspended duplex state then restart */
+		struct dasd_device *device = erp->device;
+
+		DEV_MESSAGE(KERN_ERR, device, "%s",
+			    "Set device to suspended duplex state should be "
+			    "done!\n"
+			    "This is not implemented yet (for compound ERP)"
+			    " - please report to linux390@de.ibm.com");
+
+	}
+
+	erp->function = dasd_3990_erp_compound_config;
+
+}				/* end dasd_3990_erp_compound_config */
+
+/*
+ * DASD_3990_ERP_COMPOUND 
+ *
+ * DESCRIPTION
+ *   Does the further compound program action if 
+ *   compound retry was not successful.
+ *
+ * PARAMETER
+ *   sense		sense data of the actual error
+ *   erp		pointer to the current (failed) ERP
+ *
+ * RETURN VALUES
+ *   erp		(additional) ERP pointer
+ *
+ */
+static struct dasd_ccw_req *
+dasd_3990_erp_compound(struct dasd_ccw_req * erp, char *sense)
+{
+
+	if ((erp->function == dasd_3990_erp_compound_retry) &&
+	    (erp->status == DASD_CQR_ERROR)) {
+
+		dasd_3990_erp_compound_path(erp, sense);
+	}
+
+	if ((erp->function == dasd_3990_erp_compound_path) &&
+	    (erp->status == DASD_CQR_ERROR)) {
+
+		erp = dasd_3990_erp_compound_code(erp, sense);
+	}
+
+	if ((erp->function == dasd_3990_erp_compound_code) &&
+	    (erp->status == DASD_CQR_ERROR)) {
+
+		dasd_3990_erp_compound_config(erp, sense);
+	}
+
+	/* if no compound action ERP specified, the request failed */
+	if (erp->status == DASD_CQR_ERROR) {
+
+		erp->status = DASD_CQR_FAILED;
+	}
+
+	return erp;
+
+}				/* end dasd_3990_erp_compound */
+
+/*
+ * DASD_3990_ERP_INSPECT_32 
+ *
+ * DESCRIPTION
+ *   Does a detailed inspection of the 32 byte sense data
+ *   and sets up a related error recovery action.  
+ *
+ * PARAMETER
+ *   sense		sense data of the actual error
+ *   erp		pointer to the currently created default ERP
+ *
+ * RETURN VALUES
+ *   erp_filled		pointer to the ERP
+ *
+ */
+static struct dasd_ccw_req *
+dasd_3990_erp_inspect_32(struct dasd_ccw_req * erp, char *sense)
+{
+
+	struct dasd_device *device = erp->device;
+
+	erp->function = dasd_3990_erp_inspect_32;
+
+	if (sense[25] & DASD_SENSE_BIT_0) {
+
+		/* compound program action codes (byte25 bit 0 == '1') */
+		dasd_3990_erp_compound_retry(erp, sense);
+
+	} else {
+
+		/* single program action codes (byte25 bit 0 == '0') */
+		switch (sense[25]) {
+
+		case 0x00:	/* success - use default ERP for retries */
+		        DEV_MESSAGE(KERN_DEBUG, device, "%s",
+				    "ERP called for successful request"
+				    " - just retry");
+			break;
+
+		case 0x01:	/* fatal error */
+			DEV_MESSAGE(KERN_ERR, device, "%s",
+				    "Fatal error should have been "
+				    "handled within the interrupt handler");
+
+			erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
+			break;
+
+		case 0x02:	/* intervention required */
+		case 0x03:	/* intervention required during dual copy */
+			erp = dasd_3990_erp_int_req(erp);
+			break;
+
+		case 0x0F:  /* length mismatch during update write command */
+			DEV_MESSAGE(KERN_ERR, device, "%s",
+				    "update write command error - should not "
+				    "happen;\n"
+				    "Please send this message together with "
+				    "the above sense data to linux390@de."
+				    "ibm.com");
+
+			erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
+			break;
+
+		case 0x10:  /* logging required for other channel program */
+			erp = dasd_3990_erp_action_10_32(erp, sense);
+			break;
+
+		case 0x15:	/* next track outside defined extend */
+			DEV_MESSAGE(KERN_ERR, device, "%s",
+				    "next track outside defined extend - "
+				    "should not happen;\n"
+				    "Please send this message together with "
+				    "the above sense data to linux390@de."
+				    "ibm.com");
+
+			erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
+			break;
+
+		case 0x1B:	/* unexpected condition during write */
+
+			erp = dasd_3990_erp_action_1B_32(erp, sense);
+			break;
+
+		case 0x1C:	/* invalid data */
+			DEV_MESSAGE(KERN_EMERG, device, "%s",
+				    "Data recovered during retry with PCI "
+				    "fetch mode active");
+
+			/* not possible to handle this situation in Linux */
+			panic
+			    ("Invalid data - No way to inform application "
+			     "about the possibly incorrect data");
+			break;
+
+		case 0x1D:	/* state-change pending */
+			DEV_MESSAGE(KERN_DEBUG, device, "%s",
+				    "A State change pending condition exists "
+				    "for the subsystem or device");
+
+			erp = dasd_3990_erp_action_4(erp, sense);
+			break;
+
+		case 0x1E:	/* busy */
+                        DEV_MESSAGE(KERN_DEBUG, device, "%s",
+				    "Busy condition exists "
+				    "for the subsystem or device");
+                        erp = dasd_3990_erp_action_4(erp, sense);
+			break;
+
+		default:	/* all others errors - default erp  */
+			break;
+		}
+	}
+
+	return erp;
+
+}				/* end dasd_3990_erp_inspect_32 */
+
+/*
+ ***************************************************************************** 
+ * main ERP control fuctions (24 and 32 byte sense)
+ ***************************************************************************** 
+ */
+
+/*
+ * DASD_3990_ERP_INSPECT
+ *
+ * DESCRIPTION
+ *   Does a detailed inspection for sense data by calling either
+ *   the 24-byte or the 32-byte inspection routine.
+ *
+ * PARAMETER
+ *   erp		pointer to the currently created default ERP
+ * RETURN VALUES
+ *   erp_new		contens was possibly modified 
+ */
+static struct dasd_ccw_req *
+dasd_3990_erp_inspect(struct dasd_ccw_req * erp)
+{
+
+	struct dasd_ccw_req *erp_new = NULL;
+	/* sense data are located in the refers record of the */
+	/* already set up new ERP !			      */
+	char *sense = erp->refers->irb.ecw;
+
+	/* distinguish between 24 and 32 byte sense data */
+	if (sense[27] & DASD_SENSE_BIT_0) {
+
+		/* inspect the 24 byte sense data */
+		erp_new = dasd_3990_erp_inspect_24(erp, sense);
+
+	} else {
+
+		/* inspect the 32 byte sense data */
+		erp_new = dasd_3990_erp_inspect_32(erp, sense);
+
+	}	/* end distinguish between 24 and 32 byte sense data */
+
+	return erp_new;
+}
+
+/*
+ * DASD_3990_ERP_ADD_ERP
+ * 
+ * DESCRIPTION
+ *   This funtion adds an additional request block (ERP) to the head of
+ *   the given cqr (or erp).
+ *   This erp is initialized as an default erp (retry TIC)
+ *
+ * PARAMETER
+ *   cqr		head of the current ERP-chain (or single cqr if 
+ *			first error)
+ * RETURN VALUES
+ *   erp		pointer to new ERP-chain head
+ */
+static struct dasd_ccw_req *
+dasd_3990_erp_add_erp(struct dasd_ccw_req * cqr)
+{
+
+	struct dasd_device *device = cqr->device;
+	struct ccw1 *ccw;
+
+	/* allocate additional request block */
+	struct dasd_ccw_req *erp;
+
+	erp = dasd_alloc_erp_request((char *) &cqr->magic, 2, 0, cqr->device);
+	if (IS_ERR(erp)) {
+                if (cqr->retries <= 0) {
+		        DEV_MESSAGE(KERN_ERR, device, "%s",
+				    "Unable to allocate ERP request");
+			cqr->status = DASD_CQR_FAILED;
+                        cqr->stopclk = get_clock ();
+		} else {
+                        DEV_MESSAGE (KERN_ERR, device,
+                                     "Unable to allocate ERP request "
+				     "(%i retries left)",
+                                     cqr->retries);
+			dasd_set_timer(device, (HZ << 3));
+                }
+		return cqr;
+	}
+
+	/* initialize request with default TIC to current ERP/CQR */
+	ccw = erp->cpaddr;
+	ccw->cmd_code = CCW_CMD_NOOP;
+	ccw->flags = CCW_FLAG_CC;
+	ccw++;
+	ccw->cmd_code = CCW_CMD_TIC;
+	ccw->cda      = (long)(cqr->cpaddr);
+	erp->function = dasd_3990_erp_add_erp;
+	erp->refers   = cqr;
+	erp->device   = cqr->device;
+	erp->magic    = cqr->magic;
+	erp->expires  = 0;
+	erp->retries  = 256;
+	erp->buildclk = get_clock();
+
+	erp->status = DASD_CQR_FILLED;
+
+	return erp;
+}
+
+/*
+ * DASD_3990_ERP_ADDITIONAL_ERP 
+ * 
+ * DESCRIPTION
+ *   An additional ERP is needed to handle the current error.
+ *   Add ERP to the head of the ERP-chain containing the ERP processing
+ *   determined based on the sense data.
+ *
+ * PARAMETER
+ *   cqr		head of the current ERP-chain (or single cqr if 
+ *			first error)
+ *
+ * RETURN VALUES
+ *   erp		pointer to new ERP-chain head
+ */
+static struct dasd_ccw_req *
+dasd_3990_erp_additional_erp(struct dasd_ccw_req * cqr)
+{
+
+	struct dasd_ccw_req *erp = NULL;
+
+	/* add erp and initialize with default TIC */
+	erp = dasd_3990_erp_add_erp(cqr);
+
+	/* inspect sense, determine specific ERP if possible */
+	if (erp != cqr) {
+
+		erp = dasd_3990_erp_inspect(erp);
+	}
+
+	return erp;
+
+}				/* end dasd_3990_erp_additional_erp */
+
+/*
+ * DASD_3990_ERP_ERROR_MATCH
+ *
+ * DESCRIPTION
+ *   Check if the device status of the given cqr is the same.
+ *   This means that the failed CCW and the relevant sense data
+ *   must match.
+ *   I don't distinguish between 24 and 32 byte sense because in case of
+ *   24 byte sense byte 25 and 27 is set as well.
+ *
+ * PARAMETER
+ *   cqr1		first cqr, which will be compared with the 
+ *   cqr2		second cqr.
+ *
+ * RETURN VALUES
+ *   match		'boolean' for match found
+ *			returns 1 if match found, otherwise 0.
+ */
+static int
+dasd_3990_erp_error_match(struct dasd_ccw_req *cqr1, struct dasd_ccw_req *cqr2)
+{
+
+	/* check failed CCW */
+	if (cqr1->irb.scsw.cpa != cqr2->irb.scsw.cpa) {
+		//	return 0;	/* CCW doesn't match */
+	}
+
+	/* check sense data; byte 0-2,25,27 */
+	if (!((memcmp (cqr1->irb.ecw, cqr2->irb.ecw, 3) == 0) &&
+	      (cqr1->irb.ecw[27] == cqr2->irb.ecw[27]) &&
+	      (cqr1->irb.ecw[25] == cqr2->irb.ecw[25]))) {
+
+		return 0;	/* sense doesn't match */
+	}
+
+	return 1;		/* match */
+
+}				/* end dasd_3990_erp_error_match */
+
+/*
+ * DASD_3990_ERP_IN_ERP
+ *
+ * DESCRIPTION
+ *   check if the current error already happened before.
+ *   quick exit if current cqr is not an ERP (cqr->refers=NULL)
+ *
+ * PARAMETER
+ *   cqr		failed cqr (either original cqr or already an erp)
+ *
+ * RETURN VALUES
+ *   erp		erp-pointer to the already defined error 
+ *			recovery procedure OR
+ *			NULL if a 'new' error occurred.
+ */
+static struct dasd_ccw_req *
+dasd_3990_erp_in_erp(struct dasd_ccw_req *cqr)
+{
+
+	struct dasd_ccw_req *erp_head = cqr,	/* save erp chain head */
+	*erp_match = NULL;	/* save erp chain head */
+	int match = 0;		/* 'boolean' for matching error found */
+
+	if (cqr->refers == NULL) {	/* return if not in erp */
+		return NULL;
+	}
+
+	/* check the erp/cqr chain for current error */
+	do {
+		match = dasd_3990_erp_error_match(erp_head, cqr->refers);
+		erp_match = cqr;	/* save possible matching erp  */
+		cqr = cqr->refers;	/* check next erp/cqr in queue */
+
+	} while ((cqr->refers != NULL) && (!match));
+
+	if (!match) {
+		return NULL;	/* no match was found */
+	}
+
+	return erp_match;	/* return address of matching erp */
+
+}				/* END dasd_3990_erp_in_erp */
+
+/*
+ * DASD_3990_ERP_FURTHER_ERP (24 & 32 byte sense)
+ *
+ * DESCRIPTION
+ *   No retry is left for the current ERP. Check what has to be done 
+ *   with the ERP.
+ *     - do further defined ERP action or
+ *     - wait for interrupt or	
+ *     - exit with permanent error
+ *
+ * PARAMETER
+ *   erp		ERP which is in progress with no retry left
+ *
+ * RETURN VALUES
+ *   erp		modified/additional ERP
+ */
+static struct dasd_ccw_req *
+dasd_3990_erp_further_erp(struct dasd_ccw_req *erp)
+{
+
+	struct dasd_device *device = erp->device;
+	char *sense = erp->irb.ecw;
+
+	/* check for 24 byte sense ERP */
+	if ((erp->function == dasd_3990_erp_bus_out) ||
+	    (erp->function == dasd_3990_erp_action_1) ||
+	    (erp->function == dasd_3990_erp_action_4)) {
+
+		erp = dasd_3990_erp_action_1(erp);
+
+	} else if (erp->function == dasd_3990_erp_action_5) {
+
+		/* retries have not been successful */
+		/* prepare erp for retry on different channel path */
+		erp = dasd_3990_erp_action_1(erp);
+
+		if (!(sense[2] & DASD_SENSE_BIT_0)) {
+
+			/* issue a Diagnostic Control command with an 
+			 * Inhibit Write subcommand */
+
+			switch (sense[25]) {
+			case 0x17:
+			case 0x57:{	/* controller */
+					erp = dasd_3990_erp_DCTL(erp, 0x20);
+					break;
+				}
+			case 0x18:
+			case 0x58:{	/* channel path */
+					erp = dasd_3990_erp_DCTL(erp, 0x40);
+					break;
+				}
+			case 0x19:
+			case 0x59:{	/* storage director */
+					erp = dasd_3990_erp_DCTL(erp, 0x80);
+					break;
+				}
+			default:
+				DEV_MESSAGE(KERN_DEBUG, device,
+					    "invalid subcommand modifier 0x%x "
+					    "for Diagnostic Control Command",
+					    sense[25]);
+			}
+		}
+
+		/* check for 32 byte sense ERP */
+	} else if ((erp->function == dasd_3990_erp_compound_retry) ||
+		   (erp->function == dasd_3990_erp_compound_path) ||
+		   (erp->function == dasd_3990_erp_compound_code) ||
+		   (erp->function == dasd_3990_erp_compound_config)) {
+
+		erp = dasd_3990_erp_compound(erp, sense);
+
+	} else {
+		/* No retry left and no additional special handling */
+		/*necessary */
+		DEV_MESSAGE(KERN_ERR, device,
+			    "no retries left for erp %p - "
+			    "set status to FAILED", erp);
+
+		erp->status = DASD_CQR_FAILED;
+	}
+
+	return erp;
+
+}				/* end dasd_3990_erp_further_erp */
+
+/*
+ * DASD_3990_ERP_HANDLE_MATCH_ERP 
+ *
+ * DESCRIPTION
+ *   An error occurred again and an ERP has been detected which is already
+ *   used to handle this error (e.g. retries). 
+ *   All prior ERP's are asumed to be successful and therefore removed
+ *   from queue.
+ *   If retry counter of matching erp is already 0, it is checked if further 
+ *   action is needed (besides retry) or if the ERP has failed.
+ *
+ * PARAMETER
+ *   erp_head		first ERP in ERP-chain
+ *   erp		ERP that handles the actual error.
+ *			(matching erp)
+ *
+ * RETURN VALUES
+ *   erp		modified/additional ERP
+ */
+static struct dasd_ccw_req *
+dasd_3990_erp_handle_match_erp(struct dasd_ccw_req *erp_head,
+			       struct dasd_ccw_req *erp)
+{
+
+	struct dasd_device *device = erp_head->device;
+	struct dasd_ccw_req *erp_done = erp_head;	/* finished req */
+	struct dasd_ccw_req *erp_free = NULL;	/* req to be freed */
+
+	/* loop over successful ERPs and remove them from chanq */
+	while (erp_done != erp) {
+
+		if (erp_done == NULL)	/* end of chain reached */
+			panic(PRINTK_HEADER "Programming error in ERP! The "
+			      "original request was lost\n");
+
+		/* remove the request from the device queue */
+		list_del(&erp_done->list);
+
+		erp_free = erp_done;
+		erp_done = erp_done->refers;
+
+		/* free the finished erp request */
+		dasd_free_erp_request(erp_free, erp_free->device);
+
+	}			/* end while */
+
+	if (erp->retries > 0) {
+
+		char *sense = erp->refers->irb.ecw;
+
+		/* check for special retries */
+		if (erp->function == dasd_3990_erp_action_4) {
+
+			erp = dasd_3990_erp_action_4(erp, sense);
+
+		} else if (erp->function == dasd_3990_erp_action_1B_32) {
+
+			erp = dasd_3990_update_1B(erp, sense);
+
+		} else if (erp->function == dasd_3990_erp_int_req) {
+
+			erp = dasd_3990_erp_int_req(erp);
+
+		} else {
+			/* simple retry	  */
+			DEV_MESSAGE(KERN_DEBUG, device,
+				    "%i retries left for erp %p",
+				    erp->retries, erp);
+
+			/* handle the request again... */
+			erp->status = DASD_CQR_QUEUED;
+		}
+
+	} else {
+		/* no retry left - check for further necessary action	 */
+		/* if no further actions, handle rest as permanent error */
+		erp = dasd_3990_erp_further_erp(erp);
+	}
+
+	return erp;
+
+}				/* end dasd_3990_erp_handle_match_erp */
+
+/*
+ * DASD_3990_ERP_ACTION
+ *
+ * DESCRIPTION
+ *   controll routine for 3990 erp actions.
+ *   Has to be called with the queue lock (namely the s390_irq_lock) acquired.
+ *
+ * PARAMETER
+ *   cqr		failed cqr (either original cqr or already an erp)
+ *
+ * RETURN VALUES
+ *   erp		erp-pointer to the head of the ERP action chain.
+ *			This means:
+ *			 - either a ptr to an additional ERP cqr or
+ *			 - the original given cqr (which's status might 
+ *			   be modified)
+ */
+struct dasd_ccw_req *
+dasd_3990_erp_action(struct dasd_ccw_req * cqr)
+{
+
+	struct dasd_ccw_req *erp = NULL;
+	struct dasd_device *device = cqr->device;
+	__u32 cpa = cqr->irb.scsw.cpa;
+
+#ifdef ERP_DEBUG
+	/* print current erp_chain */
+	DEV_MESSAGE(KERN_ERR, device, "%s",
+		    "ERP chain at BEGINNING of ERP-ACTION");
+	{
+		struct dasd_ccw_req *temp_erp = NULL;
+
+		for (temp_erp = cqr;
+		     temp_erp != NULL; temp_erp = temp_erp->refers) {
+
+			DEV_MESSAGE(KERN_ERR, device,
+				    "   erp %p (%02x) refers to %p",
+				    temp_erp, temp_erp->status,
+				    temp_erp->refers);
+		}
+	}
+#endif				/* ERP_DEBUG */
+
+	/* double-check if current erp/cqr was successfull */
+	if ((cqr->irb.scsw.cstat == 0x00) &&
+	    (cqr->irb.scsw.dstat == (DEV_STAT_CHN_END|DEV_STAT_DEV_END))) {
+
+		DEV_MESSAGE(KERN_DEBUG, device,
+			    "ERP called for successful request %p"
+			    " - NO ERP necessary", cqr);
+
+		cqr->status = DASD_CQR_DONE;
+
+		return cqr;
+	}
+	/* check if sense data are available */
+	if (!cqr->irb.ecw) {
+		DEV_MESSAGE(KERN_DEBUG, device,
+			    "ERP called witout sense data avail ..."
+			    "request %p - NO ERP possible", cqr);
+
+		cqr->status = DASD_CQR_FAILED;
+
+		return cqr;
+
+	}
+
+	/* check if error happened before */
+	erp = dasd_3990_erp_in_erp(cqr);
+
+	if (erp == NULL) {
+		/* no matching erp found - set up erp */
+		erp = dasd_3990_erp_additional_erp(cqr);
+	} else {
+		/* matching erp found - set all leading erp's to DONE */
+		erp = dasd_3990_erp_handle_match_erp(cqr, erp);
+	}
+
+#ifdef ERP_DEBUG
+	/* print current erp_chain */
+	DEV_MESSAGE(KERN_ERR, device, "%s", "ERP chain at END of ERP-ACTION");
+	{
+		struct dasd_ccw_req *temp_erp = NULL;
+		for (temp_erp = erp;
+		     temp_erp != NULL; temp_erp = temp_erp->refers) {
+
+			DEV_MESSAGE(KERN_ERR, device,
+				    "   erp %p (%02x) refers to %p",
+				    temp_erp, temp_erp->status,
+				    temp_erp->refers);
+		}
+	}
+#endif				/* ERP_DEBUG */
+
+	if (erp->status == DASD_CQR_FAILED)
+		dasd_log_ccw(erp, 1, cpa);
+
+	/* enqueue added ERP request */
+	if (erp->status == DASD_CQR_FILLED) {
+		erp->status = DASD_CQR_QUEUED;
+		list_add(&erp->list, &device->ccw_queue);
+	}
+
+	return erp;
+
+}				/* end dasd_3990_erp_action */
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-indent-level: 4 
+ * c-brace-imaginary-offset: 0
+ * c-brace-offset: -4
+ * c-argdecl-indent: 4
+ * c-label-offset: -4
+ * c-continued-statement-offset: 4
+ * c-continued-brace-offset: 0
+ * indent-tabs-mode: 1
+ * tab-width: 8
+ * End:
+ */