diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/s390/block/dasd_3990_erp.c | 2859 |
1 files changed, 2859 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 000000000..91cb9d52a --- /dev/null +++ b/drivers/s390/block/dasd_3990_erp.c @@ -0,0 +1,2859 @@ +// 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 if (sense[7] == SNS7_INVALID_ON_SEC) { + dev_err(&device->cdev->dev, "An I/O request was rejected on a copy pair secondary device\n"); + /* suppress dump of sense data for this error */ + set_bit(DASD_CQR_SUPPRESS_CR, &erp->refers->flags); + 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 = device->default_retries; + 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 */ |