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