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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0
 /*
  * 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 = dasd_path_get_opm(device) &
             ~(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(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 = dasd_path_get_opm(erp->startdev);
         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 sync 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 sync 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 F - 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 */
         if (!test_bit(DASD_CQR_SUPPRESS_CR, &erp->flags))
             dev_err(&device->cdev->dev,
                 "An error occurred in the DASD device driver, reason=09\n");
 
         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;
 
     /*
      * In some cases the 'No Record Found' error might be expected and
      * log messages shouldn't be written then.
      * Check if the according suppress bit is set.
      */
     if (!test_bit(DASD_CQR_SUPPRESS_NRF, &default_erp->flags))
         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;
 
     /*
      * In some cases the 'File Protected' error might be expected and
      * log messages shouldn't be written then.
      * Check if the according suppress bit is set.
      */
     if (!test_bit(DASD_CQR_SUPPRESS_FP, &erp->flags))
         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(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 = dasd_path_get_opm(erp->startdev);
             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 configuration
  *   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 */
 
 static void dasd_3990_erp_disable_path(struct dasd_device *device, __u8 lpum)
 {
     int pos = pathmask_to_pos(lpum);
 
     if (!(device->features & DASD_FEATURE_PATH_AUTODISABLE)) {
         dev_err(&device->cdev->dev,
             "Path %x.%02x (pathmask %02x) is operational despite excessive IFCCs\n",
             device->path[pos].cssid, device->path[pos].chpid, lpum);
         goto out;
     }
 
     /* no remaining path, cannot disable */
     if (!(dasd_path_get_opm(device) & ~lpum)) {
         dev_err(&device->cdev->dev,
             "Last path %x.%02x (pathmask %02x) is operational despite excessive IFCCs\n",
             device->path[pos].cssid, device->path[pos].chpid, lpum);
         goto out;
     }
 
     dev_err(&device->cdev->dev,
         "Path %x.%02x (pathmask %02x) is disabled - IFCC threshold exceeded\n",
         device->path[pos].cssid, device->path[pos].chpid, lpum);
     dasd_path_remove_opm(device, lpum);
     dasd_path_add_ifccpm(device, lpum);
 
 out:
     device->path[pos].errorclk = 0;
     atomic_set(&device->path[pos].error_count, 0);
 }
 
 static void dasd_3990_erp_account_error(struct dasd_ccw_req *erp)
 {
     struct dasd_device *device = erp->startdev;
     __u8 lpum = erp->refers->irb.esw.esw1.lpum;
     int pos = pathmask_to_pos(lpum);
     unsigned long clk;
 
     if (!device->path_thrhld)
         return;
 
     clk = get_tod_clock();
     /*
      * check if the last error is longer ago than the timeout,
      * if so reset error state
      */
     if ((tod_to_ns(clk - device->path[pos].errorclk) / NSEC_PER_SEC)
         >= device->path_interval) {
         atomic_set(&device->path[pos].error_count, 0);
         device->path[pos].errorclk = 0;
     }
     atomic_inc(&device->path[pos].error_count);
     device->path[pos].errorclk = clk;
     /* threshold exceeded disable path if possible */
     if (atomic_read(&device->path[pos].error_count) >=
         device->path_thrhld)
         dasd_3990_erp_disable_path(device, lpum);
 }
 
 /*
  *****************************************************************************
  * 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");
         dasd_3990_erp_account_error(erp);
         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(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);
     }
 
 
     /*
      * For path verification work we need to stick with the path that was
      * originally chosen so that the per path configuration data is
      * assigned correctly.
      */
     if (test_bit(DASD_CQR_VERIFY_PATH, &erp->flags) && cqr->lpm) {
         erp->lpm = cqr->lpm;
     }
 
     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 */

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