Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 2771 insertions, 0 deletions

diff --git a/kernel/drivers/s390/block/dasd_3990_erp.c b/kernel/drivers/s390/block/dasd_3990_erp.c
new file mode 100644
index 000000000..d26134713
--- /dev/null
+++ b/kernel/drivers/s390/block/dasd_3990_erp.c
@@ -0,0 +1,2771 @@
+/*
+ * Author(s)......: Horst  Hummel    <Horst.Hummel@de.ibm.com>
+ *		    Holger Smolinski <Holger.Smolinski@de.ibm.com>
+ * Bugreports.to..: <Linux390@de.ibm.com>
+ * Copyright IBM Corp. 2000, 2001
+ *
+ */
+
+#define KMSG_COMPONENT "dasd-eckd"
+
+#include <linux/timer.h>
+#include <asm/idals.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 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->memdev);
+	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->startdev;
+	unsigned long flags;
+
+	DBF_DEV_EVENT(DBF_INFO, device,
+		    "blocking request queue for %is", expires/HZ);
+
+	spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
+	dasd_device_set_stop_bits(device, DASD_STOPPED_PENDING);
+	spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
+	erp->status = DASD_CQR_FILLED;
+	if (erp->block)
+		dasd_block_set_timer(erp->block, expires);
+	else
+		dasd_device_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->startdev;
+
+	/* 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_err(&device->cdev->dev,
+			    "is offline or not installed - "
+			    "INTERVENTION REQUIRED!!\n");
+
+		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->startdev;
+	__u8 opm;
+	unsigned long flags;
+
+	/* try alternate valid path */
+	spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
+	opm = ccw_device_get_path_mask(device->cdev);
+	spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
+	if (erp->lpm == 0)
+		erp->lpm = device->path_data.opm &
+			~(erp->irb.esw.esw0.sublog.lpum);
+	else
+		erp->lpm &= ~(erp->irb.esw.esw0.sublog.lpum);
+
+	if ((erp->lpm & opm) != 0x00) {
+
+		DBF_DEV_EVENT(DBF_WARNING, device,
+			    "try alternate lpm=%x (lpum=%x / opm=%x)",
+			    erp->lpm, erp->irb.esw.esw0.sublog.lpum, opm);
+
+		/* reset status to submit the request again... */
+		erp->status = DASD_CQR_FILLED;
+		erp->retries = 10;
+	} else {
+		dev_err(&device->cdev->dev,
+			"The DASD cannot be reached on any path (lpum=%x"
+			"/opm=%x)\n", erp->irb.esw.esw0.sublog.lpum, opm);
+
+		/* post request with permanent error */
+		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->startdev;
+	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),
+					  device);
+	if (IS_ERR(dctl_cqr)) {
+		dev_err(&device->cdev->dev,
+			    "Unable to allocate DCTL-CQR\n");
+		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->flags = erp->flags;
+	dctl_cqr->function = dasd_3990_erp_DCTL;
+	dctl_cqr->refers = erp;
+	dctl_cqr->startdev = device;
+	dctl_cqr->memdev = device;
+	dctl_cqr->magic = erp->magic;
+	dctl_cqr->expires = 5 * 60 * HZ;
+	dctl_cqr->retries = 2;
+
+	dctl_cqr->buildclk = get_tod_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.
+ *   As deviation from the recommended recovery action, we reset the path mask
+ *   after we have tried each path and go through all paths a second time.
+ *   This will cover situations where only one path at a time is actually down,
+ *   but all paths fail and recover just with the same sequence and timing as
+ *   we try to use them (flapping links).
+ *   If all alternate paths have been tried twice, the request is posted with
+ *   a permanent error.
+ *
+ *  PARAMETER
+ *   erp		pointer to the current ERP
+ *
+ * RETURN VALUES
+ *   erp		pointer to the ERP
+ *
+ */
+static struct dasd_ccw_req *dasd_3990_erp_action_1_sec(struct dasd_ccw_req *erp)
+{
+	erp->function = dasd_3990_erp_action_1_sec;
+	dasd_3990_erp_alternate_path(erp);
+	return 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);
+	if (erp->status == DASD_CQR_FAILED &&
+	    !test_bit(DASD_CQR_VERIFY_PATH, &erp->flags)) {
+		erp->status = DASD_CQR_FILLED;
+		erp->retries = 10;
+		erp->lpm = erp->startdev->path_data.opm;
+		erp->function = dasd_3990_erp_action_1_sec;
+	}
+	return erp;
+}				/* end dasd_3990_erp_action_1(b) */
+
+/*
+ * 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->startdev;
+
+	/* 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) {
+
+		DBF_DEV_EVENT(DBF_INFO, device, "%s",
+			    "dasd_3990_erp_action_4: first time retry");
+
+		erp->retries = 256;
+		erp->function = dasd_3990_erp_action_4;
+
+	} else {
+		if (sense && (sense[25] == 0x1D)) { /* state change pending */
+
+			DBF_DEV_EVENT(DBF_INFO, device,
+				    "waiting for state change pending "
+				    "interrupt, %d retries left",
+				    erp->retries);
+
+			dasd_3990_erp_block_queue(erp, 30*HZ);
+
+		} else if (sense && (sense[25] == 0x1E)) {	/* busy */
+			DBF_DEV_EVENT(DBF_INFO, device,
+				    "busy - redriving request later, "
+				    "%d retries left",
+				    erp->retries);
+                        dasd_3990_erp_block_queue(erp, HZ);
+		} else {
+			/* no state change pending - retry */
+			DBF_DEV_EVENT(DBF_INFO, device,
+				     "redriving request immediately, "
+				     "%d retries left",
+				     erp->retries);
+			erp->status = DASD_CQR_FILLED;
+		}
+	}
+
+	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->startdev;
+	char msg_format = (sense[7] & 0xF0);
+	char msg_no = (sense[7] & 0x0F);
+	char errorstring[ERRORLENGTH];
+
+	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_warn(&device->cdev->dev,
+					    "FORMAT 0 - Invalid Command\n");
+				break;
+			case 0x02:
+				dev_warn(&device->cdev->dev,
+					    "FORMAT 0 - Invalid Command "
+					    "Sequence\n");
+				break;
+			case 0x03:
+				dev_warn(&device->cdev->dev,
+					    "FORMAT 0 - CCW Count less than "
+					    "required\n");
+				break;
+			case 0x04:
+				dev_warn(&device->cdev->dev,
+					    "FORMAT 0 - Invalid Parameter\n");
+				break;
+			case 0x05:
+				dev_warn(&device->cdev->dev,
+					    "FORMAT 0 - Diagnostic of Special"
+					    " Command Violates File Mask\n");
+				break;
+			case 0x07:
+				dev_warn(&device->cdev->dev,
+					    "FORMAT 0 - Channel Returned with "
+					    "Incorrect retry CCW\n");
+				break;
+			case 0x08:
+				dev_warn(&device->cdev->dev,
+					    "FORMAT 0 - Reset Notification\n");
+				break;
+			case 0x09:
+				dev_warn(&device->cdev->dev,
+					 "FORMAT 0 - Storage Path Restart\n");
+				break;
+			case 0x0A:
+				dev_warn(&device->cdev->dev,
+					    "FORMAT 0 - Channel requested "
+					    "... %02x\n", sense[8]);
+				break;
+			case 0x0B:
+				dev_warn(&device->cdev->dev,
+					    "FORMAT 0 - Invalid Defective/"
+					    "Alternate Track Pointer\n");
+				break;
+			case 0x0C:
+				dev_warn(&device->cdev->dev,
+					    "FORMAT 0 - DPS Installation "
+					    "Check\n");
+				break;
+			case 0x0E:
+				dev_warn(&device->cdev->dev,
+					    "FORMAT 0 - Command Invalid on "
+					    "Secondary Address\n");
+				break;
+			case 0x0F:
+				dev_warn(&device->cdev->dev,
+					    "FORMAT 0 - Status Not As "
+					    "Required: reason %02x\n",
+					 sense[8]);
+				break;
+			default:
+				dev_warn(&device->cdev->dev,
+					    "FORMAT 0 - Reserved\n");
+			}
+		} else {
+			switch (msg_no) {
+			case 0x00:	/* No Message */
+				break;
+			case 0x01:
+				dev_warn(&device->cdev->dev,
+					 "FORMAT 0 - Device Error "
+					 "Source\n");
+				break;
+			case 0x02:
+				dev_warn(&device->cdev->dev,
+					    "FORMAT 0 - Reserved\n");
+				break;
+			case 0x03:
+				dev_warn(&device->cdev->dev,
+					    "FORMAT 0 - Device Fenced - "
+					    "device = %02x\n", sense[4]);
+				break;
+			case 0x04:
+				dev_warn(&device->cdev->dev,
+					    "FORMAT 0 - Data Pinned for "
+					    "Device\n");
+				break;
+			default:
+				dev_warn(&device->cdev->dev,
+					    "FORMAT 0 - Reserved\n");
+			}
+		}
+		break;
+
+	case 0x10:		/* Format 1 - Device Equipment Checks */
+		switch (msg_no) {
+		case 0x00:	/* No Message */
+			break;
+		case 0x01:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 1 - Device Status 1 not as "
+				    "expected\n");
+			break;
+		case 0x03:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 1 - Index missing\n");
+			break;
+		case 0x04:
+			dev_warn(&device->cdev->dev,
+				 "FORMAT 1 - Interruption cannot be "
+				 "reset\n");
+			break;
+		case 0x05:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 1 - Device did not respond to "
+				    "selection\n");
+			break;
+		case 0x06:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 1 - Device check-2 error or Set "
+				    "Sector is not complete\n");
+			break;
+		case 0x07:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 1 - Head address does not "
+				    "compare\n");
+			break;
+		case 0x08:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 1 - Device status 1 not valid\n");
+			break;
+		case 0x09:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 1 - Device not ready\n");
+			break;
+		case 0x0A:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 1 - Track physical address did "
+				    "not compare\n");
+			break;
+		case 0x0B:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 1 - Missing device address bit\n");
+			break;
+		case 0x0C:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 1 - Drive motor switch is off\n");
+			break;
+		case 0x0D:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 1 - Seek incomplete\n");
+			break;
+		case 0x0E:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 1 - Cylinder address did not "
+				    "compare\n");
+			break;
+		case 0x0F:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 1 - Offset active cannot be "
+				    "reset\n");
+			break;
+		default:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 1 - Reserved\n");
+		}
+		break;
+
+	case 0x20:		/* Format 2 - 3990 Equipment Checks */
+		switch (msg_no) {
+		case 0x08:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 2 - 3990 check-2 error\n");
+			break;
+		case 0x0E:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 2 - Support facility errors\n");
+			break;
+		case 0x0F:
+			dev_warn(&device->cdev->dev,
+				 "FORMAT 2 - Microcode detected error "
+				 "%02x\n",
+				 sense[8]);
+			break;
+		default:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 2 - Reserved\n");
+		}
+		break;
+
+	case 0x30:		/* Format 3 - 3990 Control Checks */
+		switch (msg_no) {
+		case 0x0F:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 3 - Allegiance terminated\n");
+			break;
+		default:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 3 - Reserved\n");
+		}
+		break;
+
+	case 0x40:		/* Format 4 - Data Checks */
+		switch (msg_no) {
+		case 0x00:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 4 - Home address area error\n");
+			break;
+		case 0x01:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 4 - Count area error\n");
+			break;
+		case 0x02:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 4 - Key area error\n");
+			break;
+		case 0x03:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 4 - Data area error\n");
+			break;
+		case 0x04:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 4 - No sync byte in home address "
+				    "area\n");
+			break;
+		case 0x05:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 4 - No sync byte in count address "
+				    "area\n");
+			break;
+		case 0x06:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 4 - No sync byte in key area\n");
+			break;
+		case 0x07:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 4 - No sync byte in data area\n");
+			break;
+		case 0x08:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 4 - Home address area error; "
+				    "offset active\n");
+			break;
+		case 0x09:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 4 - Count area error; offset "
+				    "active\n");
+			break;
+		case 0x0A:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 4 - Key area error; offset "
+				    "active\n");
+			break;
+		case 0x0B:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 4 - Data area error; "
+				    "offset active\n");
+			break;
+		case 0x0C:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 4 - No sync byte in home "
+				    "address area; offset active\n");
+			break;
+		case 0x0D:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 4 - No syn byte in count "
+				    "address area; offset active\n");
+			break;
+		case 0x0E:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 4 - No sync byte in key area; "
+				    "offset active\n");
+			break;
+		case 0x0F:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 4 - No syn byte in data area; "
+				    "offset active\n");
+			break;
+		default:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 4 - Reserved\n");
+		}
+		break;
+
+	case 0x50:  /* Format 5 - Data Check with displacement information */
+		switch (msg_no) {
+		case 0x00:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 5 - Data Check in the "
+				    "home address area\n");
+			break;
+		case 0x01:
+			dev_warn(&device->cdev->dev,
+				 "FORMAT 5 - Data Check in the count "
+				 "area\n");
+			break;
+		case 0x02:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 5 - Data Check in the key area\n");
+			break;
+		case 0x03:
+			dev_warn(&device->cdev->dev,
+				 "FORMAT 5 - Data Check in the data "
+				 "area\n");
+			break;
+		case 0x08:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 5 - Data Check in the "
+				    "home address area; offset active\n");
+			break;
+		case 0x09:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 5 - Data Check in the count area; "
+				    "offset active\n");
+			break;
+		case 0x0A:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 5 - Data Check in the key area; "
+				    "offset active\n");
+			break;
+		case 0x0B:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 5 - Data Check in the data area; "
+				    "offset active\n");
+			break;
+		default:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 5 - Reserved\n");
+		}
+		break;
+
+	case 0x60:  /* Format 6 - Usage Statistics/Overrun Errors */
+		switch (msg_no) {
+		case 0x00:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 6 - Overrun on channel A\n");
+			break;
+		case 0x01:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 6 - Overrun on channel B\n");
+			break;
+		case 0x02:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 6 - Overrun on channel C\n");
+			break;
+		case 0x03:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 6 - Overrun on channel D\n");
+			break;
+		case 0x04:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 6 - Overrun on channel E\n");
+			break;
+		case 0x05:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 6 - Overrun on channel F\n");
+			break;
+		case 0x06:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 6 - Overrun on channel G\n");
+			break;
+		case 0x07:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 6 - Overrun on channel H\n");
+			break;
+		default:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 6 - Reserved\n");
+		}
+		break;
+
+	case 0x70:  /* Format 7 - Device Connection Control Checks */
+		switch (msg_no) {
+		case 0x00:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 7 - RCC initiated by a connection "
+				    "check alert\n");
+			break;
+		case 0x01:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 7 - RCC 1 sequence not "
+				    "successful\n");
+			break;
+		case 0x02:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 7 - RCC 1 and RCC 2 sequences not "
+				    "successful\n");
+			break;
+		case 0x03:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 7 - Invalid tag-in during "
+				    "selection sequence\n");
+			break;
+		case 0x04:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 7 - extra RCC required\n");
+			break;
+		case 0x05:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 7 - Invalid DCC selection "
+				    "response or timeout\n");
+			break;
+		case 0x06:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 7 - Missing end operation; device "
+				    "transfer complete\n");
+			break;
+		case 0x07:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 7 - Missing end operation; device "
+				    "transfer incomplete\n");
+			break;
+		case 0x08:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 7 - Invalid tag-in for an "
+				    "immediate command sequence\n");
+			break;
+		case 0x09:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 7 - Invalid tag-in for an "
+				    "extended command sequence\n");
+			break;
+		case 0x0A:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 7 - 3990 microcode time out when "
+				    "stopping selection\n");
+			break;
+		case 0x0B:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 7 - No response to selection "
+				    "after a poll interruption\n");
+			break;
+		case 0x0C:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 7 - Permanent path error (DASD "
+				    "controller not available)\n");
+			break;
+		case 0x0D:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 7 - DASD controller not available"
+				    " on disconnected command chain\n");
+			break;
+		default:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 7 - Reserved\n");
+		}
+		break;
+
+	case 0x80:  /* Format 8 - Additional Device Equipment Checks */
+		switch (msg_no) {
+		case 0x00:	/* No Message */
+		case 0x01:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 8 - Error correction code "
+				    "hardware fault\n");
+			break;
+		case 0x03:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 8 - Unexpected end operation "
+				    "response code\n");
+			break;
+		case 0x04:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 8 - End operation with transfer "
+				    "count not zero\n");
+			break;
+		case 0x05:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 8 - End operation with transfer "
+				    "count zero\n");
+			break;
+		case 0x06:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 8 - DPS checks after a system "
+				    "reset or selective reset\n");
+			break;
+		case 0x07:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 8 - DPS cannot be filled\n");
+			break;
+		case 0x08:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 8 - Short busy time-out during "
+				    "device selection\n");
+			break;
+		case 0x09:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 8 - DASD controller failed to "
+				    "set or reset the long busy latch\n");
+			break;
+		case 0x0A:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 8 - No interruption from device "
+				    "during a command chain\n");
+			break;
+		default:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 8 - Reserved\n");
+		}
+		break;
+
+	case 0x90:  /* Format 9 - Device Read, Write, and Seek Checks */
+		switch (msg_no) {
+		case 0x00:
+			break;	/* No Message */
+		case 0x06:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 9 - Device check-2 error\n");
+			break;
+		case 0x07:
+			dev_warn(&device->cdev->dev,
+				 "FORMAT 9 - Head address did not "
+				 "compare\n");
+			break;
+		case 0x0A:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 9 - Track physical address did "
+				    "not compare while oriented\n");
+			break;
+		case 0x0E:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 9 - Cylinder address did not "
+				    "compare\n");
+			break;
+		default:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT 9 - Reserved\n");
+		}
+		break;
+
+	case 0xF0:		/* Format F - Cache Storage Checks */
+		switch (msg_no) {
+		case 0x00:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT F - Operation Terminated\n");
+			break;
+		case 0x01:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT F - Subsystem Processing Error\n");
+			break;
+		case 0x02:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT F - Cache or nonvolatile storage "
+				    "equipment failure\n");
+			break;
+		case 0x04:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT F - Caching terminated\n");
+			break;
+		case 0x06:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT F - Cache fast write access not "
+				    "authorized\n");
+			break;
+		case 0x07:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT F - Track format incorrect\n");
+			break;
+		case 0x09:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT F - Caching reinitiated\n");
+			break;
+		case 0x0A:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT F - Nonvolatile storage "
+				    "terminated\n");
+			break;
+		case 0x0B:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT F - Volume is suspended duplex\n");
+			/* call extended error reporting (EER) */
+			dasd_eer_write(device, erp->refers,
+				       DASD_EER_PPRCSUSPEND);
+			break;
+		case 0x0C:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT F - Subsystem status cannot be "
+				    "determined\n");
+			break;
+		case 0x0D:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT F - Caching status reset to "
+				    "default\n");
+			break;
+		case 0x0E:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT F - DASD Fast Write inhibited\n");
+			break;
+		default:
+			dev_warn(&device->cdev->dev,
+				    "FORMAT D - Reserved\n");
+		}
+		break;
+
+	default:	/* unknown message format - should not happen
+			   internal error 03 - unknown message format */
+		snprintf(errorstring, ERRORLENGTH, "03 %x02", msg_format);
+		dev_err(&device->cdev->dev,
+			 "An error occurred in the DASD device driver, "
+			 "reason=%s\n", errorstring);
+		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->startdev;
+
+	erp->function = dasd_3990_erp_com_rej;
+
+	/* env data present (ACTION 10 - retry should work) */
+	if (sense[2] & SNS2_ENV_DATA_PRESENT) {
+
+		DBF_DEV_EVENT(DBF_WARNING, device, "%s",
+			    "Command Reject - environmental data present");
+
+		dasd_3990_handle_env_data(erp, sense);
+
+		erp->retries = 5;
+
+	} else if (sense[1] & SNS1_WRITE_INHIBITED) {
+		dev_err(&device->cdev->dev, "An I/O request was rejected"
+			" because writing is inhibited\n");
+		erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
+	} else {
+		/* fatal error -  set status to FAILED
+		   internal error 09 - Command Reject */
+		dev_err(&device->cdev->dev, "An error occurred in the DASD "
+			"device driver, reason=%s\n", "09");
+
+		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->startdev;
+
+	/* 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 */
+		DBF_DEV_EVENT(DBF_WARNING, 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->startdev;
+
+	erp->function = dasd_3990_erp_equip_check;
+
+	if (sense[1] & SNS1_WRITE_INHIBITED) {
+		dev_info(&device->cdev->dev,
+			    "Write inhibited path encountered\n");
+
+		/* vary path offline
+		   internal error 04 - Path should be varied off-line.*/
+		dev_err(&device->cdev->dev, "An error occurred in the DASD "
+			"device driver, reason=%s\n", "04");
+
+		erp = dasd_3990_erp_action_1(erp);
+
+	} else if (sense[2] & SNS2_ENV_DATA_PRESENT) {
+
+		DBF_DEV_EVENT(DBF_WARNING, 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) {
+
+		DBF_DEV_EVENT(DBF_WARNING, 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 */
+		DBF_DEV_EVENT(DBF_WARNING, 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->startdev;
+
+	erp->function = dasd_3990_erp_data_check;
+
+	if (sense[2] & SNS2_CORRECTABLE) {	/* correctable data check */
+
+		/* issue message that the data has been corrected */
+		dev_emerg(&device->cdev->dev,
+			    "Data recovered during retry with PCI "
+			    "fetch mode active\n");
+
+		/* 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) {
+
+		DBF_DEV_EVENT(DBF_WARNING, 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) {
+
+		DBF_DEV_EVENT(DBF_WARNING, device, "%s",
+			    "Uncorrectable data check with internal "
+			    "retry exhausted");
+
+		erp = dasd_3990_erp_action_1(erp);
+
+	} else {
+		/* all other data checks */
+		DBF_DEV_EVENT(DBF_WARNING, 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->startdev;
+
+	erp->function = dasd_3990_erp_overrun;
+
+	DBF_DEV_EVENT(DBF_WARNING, 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->startdev;
+
+	erp->function = dasd_3990_erp_inv_format;
+
+	if (sense[2] & SNS2_ENV_DATA_PRESENT) {
+
+		DBF_DEV_EVENT(DBF_WARNING, 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 {
+		/* internal error 06 - The track format is not valid*/
+		dev_err(&device->cdev->dev,
+			"An error occurred in the DASD device driver, "
+			"reason=%s\n", "06");
+
+		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->startdev;
+
+	dev_err(&device->cdev->dev,
+		"The cylinder data for accessing the DASD is inconsistent\n");
+
+	/* 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->startdev;
+
+	erp->function = dasd_3990_erp_env_data;
+
+	DBF_DEV_EVENT(DBF_WARNING, 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->status = DASD_CQR_FILLED;
+	}
+
+	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->startdev;
+
+	dev_err(&device->cdev->dev,
+		    "The specified record was not found\n");
+
+	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->startdev;
+
+	dev_err(&device->cdev->dev, "Accessing the DASD failed because of "
+		"a hardware error\n");
+
+	return dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
+
+}				/* end dasd_3990_erp_file_prot */
+
+/*
+ * DASD_3990_ERP_INSPECT_ALIAS
+ *
+ * DESCRIPTION
+ *   Checks if the original request was started on an alias device.
+ *   If yes, it modifies the original and the erp request so that
+ *   the erp request can be started on a base device.
+ *
+ * PARAMETER
+ *   erp		pointer to the currently created default ERP
+ *
+ * RETURN VALUES
+ *   erp		pointer to the modified ERP, or NULL
+ */
+
+static struct dasd_ccw_req *dasd_3990_erp_inspect_alias(
+						struct dasd_ccw_req *erp)
+{
+	struct dasd_ccw_req *cqr = erp->refers;
+	char *sense;
+
+	if (cqr->block &&
+	    (cqr->block->base != cqr->startdev)) {
+
+		sense = dasd_get_sense(&erp->refers->irb);
+		/*
+		 * dynamic pav may have changed base alias mapping
+		 */
+		if (!test_bit(DASD_FLAG_OFFLINE, &cqr->startdev->flags) && sense
+		    && (sense[0] == 0x10) && (sense[7] == 0x0F)
+		    && (sense[8] == 0x67)) {
+			/*
+			 * remove device from alias handling to prevent new
+			 * requests from being scheduled on the
+			 * wrong alias device
+			 */
+			dasd_alias_remove_device(cqr->startdev);
+
+			/* schedule worker to reload device */
+			dasd_reload_device(cqr->startdev);
+		}
+
+		if (cqr->startdev->features & DASD_FEATURE_ERPLOG) {
+			DBF_DEV_EVENT(DBF_ERR, cqr->startdev,
+				    "ERP on alias device for request %p,"
+				    " recover on base device %s", cqr,
+				    dev_name(&cqr->block->base->cdev->dev));
+		}
+		dasd_eckd_reset_ccw_to_base_io(cqr);
+		erp->startdev = cqr->block->base;
+		erp->function = dasd_3990_erp_inspect_alias;
+		return erp;
+	} else
+		return NULL;
+}
+
+
+/*
+ * 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->startdev;
+
+	erp->retries = 256;
+	erp->function = dasd_3990_erp_action_10_32;
+
+	DBF_DEV_EVENT(DBF_WARNING, 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->startdev;
+	__u32 cpa = 0;
+	struct dasd_ccw_req *cqr;
+	struct dasd_ccw_req *erp;
+	struct DE_eckd_data *DE_data;
+	struct PFX_eckd_data *PFX_data;
+	char *LO_data;		/* LO_eckd_data_t */
+	struct ccw1 *ccw, *oldccw;
+
+	DBF_DEV_EVENT(DBF_WARNING, 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;
+	}
+
+	if (scsw_is_tm(&cqr->irb.scsw)) {
+		DBF_DEV_EVENT(DBF_WARNING, device, "%s",
+			      "32 bit sense, action 1B is not defined"
+			      " in transport mode - just retry");
+		return default_erp;
+	}
+
+	/* for imprecise ending just do default erp */
+	if (sense[1] & 0x01) {
+		DBF_DEV_EVENT(DBF_WARNING, 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.cmd.cpa;
+
+	if (cpa == 0) {
+		DBF_DEV_EVENT(DBF_WARNING, 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)) {
+		/* internal error 01 - Unable to allocate ERP */
+		dev_err(&device->cdev->dev, "An error occurred in the DASD "
+			"device driver, reason=%s\n", "01");
+		return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED);
+	}
+
+	/* use original DE */
+	DE_data = erp->data;
+	oldccw = cqr->cpaddr;
+	if (oldccw->cmd_code == DASD_ECKD_CCW_PFX) {
+		PFX_data = cqr->data;
+		memcpy(DE_data, &PFX_data->define_extent,
+		       sizeof(struct DE_eckd_data));
+	} else
+		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)) {
+		/* should not */
+		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->flags = default_erp->flags;
+	erp->function = dasd_3990_erp_action_1B_32;
+	erp->refers = default_erp->refers;
+	erp->startdev = device;
+	erp->memdev = device;
+	erp->magic = default_erp->magic;
+	erp->expires = default_erp->expires;
+	erp->retries = 256;
+	erp->buildclk = get_tod_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->startdev;
+	__u32 cpa = 0;
+	struct dasd_ccw_req *cqr;
+	struct dasd_ccw_req *erp;
+	char *LO_data;		/* struct LO_eckd_data */
+	struct ccw1 *ccw;
+
+	DBF_DEV_EVENT(DBF_WARNING, 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;
+	}
+
+	if (scsw_is_tm(&cqr->irb.scsw)) {
+		DBF_DEV_EVENT(DBF_WARNING, device, "%s",
+			      "32 bit sense, action 1B, update,"
+			      " in transport mode - just retry");
+		return previous_erp;
+	}
+
+	/* for imprecise ending just do default erp */
+	if (sense[1] & 0x01) {
+		DBF_DEV_EVENT(DBF_WARNING, device, "%s",
+			    "Imprecise ending is set - just retry");
+
+		previous_erp->status = DASD_CQR_FILLED;
+
+		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.cmd.cpa;
+
+	if (cpa == 0) {
+		/* internal error 02 -
+		   Unable to determine address of the CCW to be restarted */
+		dev_err(&device->cdev->dev, "An error occurred in the DASD "
+			"device driver, reason=%s\n", "02");
+
+		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)) {
+		/* 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_FILLED;
+
+	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 &&
+		    !test_bit(DASD_CQR_VERIFY_PATH, &erp->flags)) {
+			/* reset the lpm and the status to be able to
+			 * try further actions. */
+			erp->lpm = erp->startdev->path_data.opm;
+			erp->status = DASD_CQR_NEED_ERP;
+		}
+	}
+
+	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 controller 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
+		   internal error 05 - Set device to suspended duplex state
+		   should be done */
+		struct dasd_device *device = erp->startdev;
+		dev_err(&device->cdev->dev,
+			"An error occurred in the DASD device driver, "
+			"reason=%s\n", "05");
+
+	}
+
+	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_NEED_ERP)) {
+
+		dasd_3990_erp_compound_path(erp, sense);
+	}
+
+	if ((erp->function == dasd_3990_erp_compound_path) &&
+	    (erp->status == DASD_CQR_NEED_ERP)) {
+
+		erp = dasd_3990_erp_compound_code(erp, sense);
+	}
+
+	if ((erp->function == dasd_3990_erp_compound_code) &&
+	    (erp->status == DASD_CQR_NEED_ERP)) {
+
+		dasd_3990_erp_compound_config(erp, sense);
+	}
+
+	/* if no compound action ERP specified, the request failed */
+	if (erp->status == DASD_CQR_NEED_ERP)
+		erp->status = DASD_CQR_FAILED;
+
+	return erp;
+
+}				/* end dasd_3990_erp_compound */
+
+/*
+ *DASD_3990_ERP_HANDLE_SIM
+ *
+ *DESCRIPTION
+ *  inspects the SIM SENSE data and starts an appropriate action
+ *
+ * PARAMETER
+ *   sense	   sense data of the actual error
+ *
+ * RETURN VALUES
+ *   none
+ */
+void
+dasd_3990_erp_handle_sim(struct dasd_device *device, char *sense)
+{
+	/* print message according to log or message to operator mode */
+	if ((sense[24] & DASD_SIM_MSG_TO_OP) || (sense[1] & 0x10)) {
+		/* print SIM SRC from RefCode */
+		dev_err(&device->cdev->dev, "SIM - SRC: "
+			    "%02x%02x%02x%02x\n", sense[22],
+			    sense[23], sense[11], sense[12]);
+	} else if (sense[24] & DASD_SIM_LOG) {
+		/* print SIM SRC Refcode */
+		dev_warn(&device->cdev->dev, "log SIM - SRC: "
+			    "%02x%02x%02x%02x\n", sense[22],
+			    sense[23], sense[11], sense[12]);
+	}
+}
+
+/*
+ * 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->startdev;
+
+	erp->function = dasd_3990_erp_inspect_32;
+
+	/* check for SIM sense data */
+	if ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)
+		dasd_3990_erp_handle_sim(device, sense);
+
+	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 */
+			DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
+				    "ERP called for successful request"
+				    " - just retry");
+			break;
+
+		case 0x01:	/* fatal error */
+			dev_err(&device->cdev->dev,
+				    "ERP failed for the DASD\n");
+
+			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
+			       internal error 08 - update write command error*/
+			dev_err(&device->cdev->dev, "An error occurred in the "
+				"DASD device driver, reason=%s\n", "08");
+
+			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
+				   internal error 07 - The next track is not
+				   within the defined storage extent */
+			dev_err(&device->cdev->dev,
+				"An error occurred in the DASD device driver, "
+				"reason=%s\n", "07");
+
+			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_emerg(&device->cdev->dev,
+				    "Data recovered during retry with PCI "
+				    "fetch mode active\n");
+
+			/* 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 */
+			DBF_DEV_EVENT(DBF_WARNING, 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 */
+			DBF_DEV_EVENT(DBF_WARNING, 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 functions (24 and 32 byte sense)
+ *****************************************************************************
+ */
+
+/*
+ * DASD_3990_ERP_CONTROL_CHECK
+ *
+ * DESCRIPTION
+ *   Does a generic inspection if a control check occurred and sets up
+ *   the related error recovery procedure
+ *
+ * PARAMETER
+ *   erp		pointer to the currently created default ERP
+ *
+ * RETURN VALUES
+ *   erp_filled		pointer to the erp
+ */
+
+static struct dasd_ccw_req *
+dasd_3990_erp_control_check(struct dasd_ccw_req *erp)
+{
+	struct dasd_device *device = erp->startdev;
+
+	if (scsw_cstat(&erp->refers->irb.scsw) & (SCHN_STAT_INTF_CTRL_CHK
+					   | SCHN_STAT_CHN_CTRL_CHK)) {
+		DBF_DEV_EVENT(DBF_WARNING, device, "%s",
+			    "channel or interface control check");
+		erp = dasd_3990_erp_action_4(erp, NULL);
+	}
+	return erp;
+}
+
+/*
+ * 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;
+	char *sense;
+
+	/* if this problem occurred on an alias retry on base */
+	erp_new = dasd_3990_erp_inspect_alias(erp);
+	if (erp_new)
+		return erp_new;
+
+	/* sense data are located in the refers record of the
+	 * already set up new ERP !
+	 * check if concurrent sens is available
+	 */
+	sense = dasd_get_sense(&erp->refers->irb);
+	if (!sense)
+		erp_new = dasd_3990_erp_control_check(erp);
+	/* distinguish between 24 and 32 byte sense data */
+	else 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 function adds an additional request block (ERP) to the head of
+ *   the given cqr (or erp).
+ *   For a command mode cqr the erp is initialized as an default erp
+ *   (retry TIC).
+ *   For transport mode we make a copy of the original TCW (points to
+ *   the original TCCB, TIDALs, etc.) but give it a fresh
+ *   TSB so the original sense data will not be changed.
+ *
+ * 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->startdev;
+	struct ccw1 *ccw;
+	struct dasd_ccw_req *erp;
+	int cplength, datasize;
+	struct tcw *tcw;
+	struct tsb *tsb;
+
+	if (cqr->cpmode == 1) {
+		cplength = 0;
+		/* TCW needs to be 64 byte aligned, so leave enough room */
+		datasize = 64 + sizeof(struct tcw) + sizeof(struct tsb);
+	} else {
+		cplength = 2;
+		datasize = 0;
+	}
+
+	/* allocate additional request block */
+	erp = dasd_alloc_erp_request((char *) &cqr->magic,
+				     cplength, datasize, device);
+	if (IS_ERR(erp)) {
+                if (cqr->retries <= 0) {
+			DBF_DEV_EVENT(DBF_ERR, device, "%s",
+				    "Unable to allocate ERP request");
+			cqr->status = DASD_CQR_FAILED;
+			cqr->stopclk = get_tod_clock();
+		} else {
+			DBF_DEV_EVENT(DBF_ERR, device,
+                                     "Unable to allocate ERP request "
+				     "(%i retries left)",
+                                     cqr->retries);
+			dasd_block_set_timer(device->block, (HZ << 3));
+                }
+		return erp;
+	}
+
+	ccw = cqr->cpaddr;
+	if (cqr->cpmode == 1) {
+		/* make a shallow copy of the original tcw but set new tsb */
+		erp->cpmode = 1;
+		erp->cpaddr = PTR_ALIGN(erp->data, 64);
+		tcw = erp->cpaddr;
+		tsb = (struct tsb *) &tcw[1];
+		*tcw = *((struct tcw *)cqr->cpaddr);
+		tcw->tsb = (long)tsb;
+	} else if (ccw->cmd_code == DASD_ECKD_CCW_PSF) {
+		/* PSF cannot be chained from NOOP/TIC */
+		erp->cpaddr = cqr->cpaddr;
+	} else {
+		/* 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->flags = cqr->flags;
+	erp->function = dasd_3990_erp_add_erp;
+	erp->refers   = cqr;
+	erp->startdev = device;
+	erp->memdev   = device;
+	erp->block    = cqr->block;
+	erp->magic    = cqr->magic;
+	erp->expires  = cqr->expires;
+	erp->retries  = 256;
+	erp->buildclk = get_tod_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);
+
+	if (IS_ERR(erp))
+		return erp;
+
+	/* 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)
+{
+	char *sense1, *sense2;
+
+	if (cqr1->startdev != cqr2->startdev)
+		return 0;
+
+	sense1 = dasd_get_sense(&cqr1->irb);
+	sense2 = dasd_get_sense(&cqr2->irb);
+
+	/* one request has sense data, the other not -> no match, return 0 */
+	if (!sense1 != !sense2)
+		return 0;
+	/* no sense data in both cases -> check cstat for IFCC */
+	if (!sense1 && !sense2)	{
+		if ((scsw_cstat(&cqr1->irb.scsw) & (SCHN_STAT_INTF_CTRL_CHK |
+						    SCHN_STAT_CHN_CTRL_CHK)) ==
+		    (scsw_cstat(&cqr2->irb.scsw) & (SCHN_STAT_INTF_CTRL_CHK |
+						    SCHN_STAT_CHN_CTRL_CHK)))
+			return 1; /* match with ifcc*/
+	}
+	/* check sense data; byte 0-2,25,27 */
+	if (!(sense1 && sense2 &&
+	      (memcmp(sense1, sense2, 3) == 0) &&
+	      (sense1[27] == sense2[27]) &&
+	      (sense1[25] == sense2[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->startdev;
+	char *sense = dasd_get_sense(&erp->irb);
+
+	/* 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_1_sec) {
+		erp = dasd_3990_erp_action_1_sec(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 && !(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:
+				DBF_DEV_EVENT(DBF_WARNING, device,
+					    "invalid subcommand modifier 0x%x "
+					    "for Diagnostic Control Command",
+					    sense[25]);
+			}
+		}
+
+		/* check for 32 byte sense ERP */
+	} else if (sense &&
+		   ((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_err(&device->cdev->dev,
+			"ERP %p has run out of retries and failed\n", 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->startdev;
+	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->blocklist);
+
+		erp_free = erp_done;
+		erp_done = erp_done->refers;
+
+		/* free the finished erp request */
+		dasd_free_erp_request(erp_free, erp_free->memdev);
+
+	}			/* end while */
+
+	if (erp->retries > 0) {
+
+		char *sense = dasd_get_sense(&erp->refers->irb);
+
+		/* check for special retries */
+		if (sense && erp->function == dasd_3990_erp_action_4) {
+
+			erp = dasd_3990_erp_action_4(erp, sense);
+
+		} else if (sense &&
+			   erp->function == dasd_3990_erp_action_1B_32) {
+
+			erp = dasd_3990_update_1B(erp, sense);
+
+		} else if (sense && erp->function == dasd_3990_erp_int_req) {
+
+			erp = dasd_3990_erp_int_req(erp);
+
+		} else {
+			/* simple retry	  */
+			DBF_DEV_EVENT(DBF_DEBUG, device,
+				    "%i retries left for erp %p",
+				    erp->retries, erp);
+
+			/* handle the request again... */
+			erp->status = DASD_CQR_FILLED;
+		}
+
+	} 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
+ *   control 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->startdev;
+	struct dasd_ccw_req *temp_erp = NULL;
+
+	if (device->features & DASD_FEATURE_ERPLOG) {
+		/* print current erp_chain */
+		dev_err(&device->cdev->dev,
+			    "ERP chain at BEGINNING of ERP-ACTION\n");
+		for (temp_erp = cqr;
+		     temp_erp != NULL; temp_erp = temp_erp->refers) {
+
+			dev_err(&device->cdev->dev,
+				    "ERP %p (%02x) refers to %p\n",
+				    temp_erp, temp_erp->status,
+				    temp_erp->refers);
+		}
+	}
+
+	/* double-check if current erp/cqr was successful */
+	if ((scsw_cstat(&cqr->irb.scsw) == 0x00) &&
+	    (scsw_dstat(&cqr->irb.scsw) ==
+	     (DEV_STAT_CHN_END | DEV_STAT_DEV_END))) {
+
+		DBF_DEV_EVENT(DBF_DEBUG, device,
+			    "ERP called for successful request %p"
+			    " - NO ERP necessary", cqr);
+
+		cqr->status = DASD_CQR_DONE;
+
+		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);
+		if (IS_ERR(erp))
+			return erp;
+	} else {
+		/* matching erp found - set all leading erp's to DONE */
+		erp = dasd_3990_erp_handle_match_erp(cqr, erp);
+	}
+
+	if (device->features & DASD_FEATURE_ERPLOG) {
+		/* print current erp_chain */
+		dev_err(&device->cdev->dev,
+			    "ERP chain at END of ERP-ACTION\n");
+		for (temp_erp = erp;
+		     temp_erp != NULL; temp_erp = temp_erp->refers) {
+
+			dev_err(&device->cdev->dev,
+				    "ERP %p (%02x) refers to %p\n",
+				    temp_erp, temp_erp->status,
+				    temp_erp->refers);
+		}
+	}
+
+	/* enqueue ERP request if it's a new one */
+	if (list_empty(&erp->blocklist)) {
+		cqr->status = DASD_CQR_IN_ERP;
+		/* add erp request before the cqr */
+		list_add_tail(&erp->blocklist, &cqr->blocklist);
+	}
+
+
+
+	return erp;
+
+}				/* end dasd_3990_erp_action */