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1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 | /* * 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 */ #include <linux/blkdev.h> #include <asm/ccwcache.h> #include <asm/idals.h> #include <asm/dasd.h> #include <asm/s390io.h> #include <linux/timer.h> #include "dasd_eckd.h" #include "dasd_3990_erp.h" #ifdef PRINTK_HEADER #undef PRINTK_HEADER #endif /* PRINTK_HEADER */ #define PRINTK_HEADER "dasd_erp(3990): " /* ***************************************************************************** * 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 error´s. * * All other configurations are handled as recoverable errors. * * RETURN VALUES * dasd_era_fatal for all fatal (unrecoverable errors) * dasd_era_recover for all others. */ dasd_era_t dasd_3990_erp_examine_24 (char *sense) { /* check for 'Command Recejct' which is always a fatal error */ if (sense[0] & SNS0_CMD_REJECT) { if (sense[2] & SNS2_ENV_DATA_PRESENT) { return dasd_era_recover; } else { return dasd_era_fatal; } } /* check for 'Invalid Track Format' */ if (sense[1] & SNS1_INV_TRACK_FORMAT) { if (sense[2] & SNS2_ENV_DATA_PRESENT) { return dasd_era_recover; } else { return dasd_era_fatal; } } /* check for 'No Record Found' */ if (sense[1] & SNS1_NO_REC_FOUND) { 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. */ dasd_era_t dasd_3990_erp_examine_32 (char *sense) { switch (sense[25]) { case 0x00: return dasd_era_none; case 0x01: 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 (ccw_req_t * cqr, devstat_t * stat) { char *sense = stat->ii.sense.data; /* check for successful execution first */ if (stat->cstat == 0x00 && stat->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) { /* examine the 24 byte sense data */ return dasd_3990_erp_examine_24 (sense); } else { /* examine the 32 byte sense data */ return dasd_3990_erp_examine_32 (sense); } /* end distinguish between 24 and 32 byte sense data */ } /* END dasd_3990_erp_examine */ /* ***************************************************************************** * SECTION ERP HANDLING ***************************************************************************** */ /* ***************************************************************************** * 24 and 32 byte sense ERP functions ***************************************************************************** */ /* * 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. * * PARAMETER * erp request to be blocked * expires time to wait until restart (in seconds) * * RETURN VALUES * void */ void dasd_3990_erp_block_queue (ccw_req_t *erp, unsigned long expires) { dasd_device_t *device = erp->device; DASD_MESSAGE (KERN_INFO, device, "blocking request queue for %is", (int) expires); atomic_compare_and_swap_debug (&erp->status, CQR_STATUS_ERROR, CQR_STATUS_PENDING); /* restart queue after some time */ device->timer.function = dasd_3990_erp_restart_queue; device->timer.data = (unsigned long) erp; device->timer.expires = jiffies + (expires * HZ); add_timer(&device->timer); /* restart queue using int handler routing - just for testing - TDB */ /* insert "void dasd_handle_state_change_pending (devstat_t *stat);" to dasd.h */ // device->timer.function = dasd_handle_state_change_pending; // device->timer.data = (unsigned long) &device->dev_status; // device->timer.expires = jiffies + (expires * HZ); // add_timer(&device->timer); } /* end dasd_3990_erp_block_queue */ /* * DASD_3990_ERP_RESTART_QUEUE * * DESCRIPTION * Restarts request currently in status PENDING. * This has to be done if either an related interrupt has received, or * a timer has expired. * * * PARAMETER * erp pointer to the PENDING ERP * * RETURN VALUES * void * */ void dasd_3990_erp_restart_queue (unsigned long erp) { ccw_req_t *cqr = (void *) erp; dasd_device_t *device = cqr->device; unsigned long flags; /* TBD delete */ DASD_MESSAGE (KERN_INFO, device, "%s irq %d erp %p", "dasd_3990_erp_restart_queue entered",device->devinfo.irq, erp); /* get the needed locks to modify the request queue */ s390irq_spin_lock_irqsave (device->devinfo.irq, flags); /* 'restart' the device queue */ if (atomic_read(&cqr->status) == CQR_STATUS_PENDING){ DASD_MESSAGE (KERN_INFO, device, "%s", "request queue restarted by MIH"); atomic_compare_and_swap_debug (&cqr->status, CQR_STATUS_PENDING, CQR_STATUS_QUEUED); } /* release the lock */ s390irq_spin_unlock_irqrestore (device->devinfo.irq, flags); dasd_schedule_bh(); } /* end dasd_3990_erp_restart_queue */ /* * 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 * */ void dasd_3990_erp_alternate_path (ccw_req_t *erp) { dasd_device_t *device = erp->device; int irq = device->devinfo.irq; /* dissable current channel path - this causes the use of an other channel path if there is one.. */ DASD_MESSAGE (KERN_WARNING, device, "disable lpu %x", erp->dstat->lpum); /* try alternate valid path */ erp->lpm &= ~(erp->dstat->lpum); erp->options |= DOIO_VALID_LPM; /* use LPM for DO_IO */ if ((erp->lpm & ioinfo[irq]->opm) != 0x00) { DASD_MESSAGE (KERN_WARNING, device, "try alternate lpm %x", erp->lpm); /* reset status to queued to handle the request again... */ atomic_compare_and_swap_debug (&erp->status, CQR_STATUS_ERROR, CQR_STATUS_QUEUED); erp->retries = 1; } else { DASD_MESSAGE (KERN_WARNING, device, "%s", "No alternate channel path left -> " "permanent error"); /* post request with permanent error */ atomic_compare_and_swap_debug (&erp->status, CQR_STATUS_ERROR, CQR_STATUS_FAILED); } } /* end dasd_3990_erp_alternate_path */ /* * 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 * */ ccw_req_t * dasd_3990_erp_action_1 (ccw_req_t * erp) { erp->function = dasd_3990_erp_action_1; // cpcmd ("TRACE IO 153 INST INT CCW", NULL, 0); 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 * */ ccw_req_t * dasd_3990_erp_action_4 (ccw_req_t *erp, char *sense) { dasd_device_t *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) { erp->retries = 255; /* TBD 255 */ erp->function = dasd_3990_erp_action_4; } else { if (sense[25] & 0x1D) { /* state change pending */ DASD_MESSAGE (KERN_WARNING, device, "%s", "waiting for state change pending " "int"); dasd_3990_erp_block_queue (erp, 60); /* TBD change to 30 */ } else { /* no state change pending - retry */ printk (KERN_WARNING PRINTK_HEADER "no state change pending - retry\n"); atomic_compare_and_swap_debug (&erp->status, CQR_STATUS_ERROR, CQR_STATUS_QUEUED); } } return erp; } /* end dasd_3990_erp_action_4 */ /* ***************************************************************************** * 24 byte sense ERP functions (only) ***************************************************************************** */ /* * 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 */ ccw_req_t * dasd_3990_erp_equip_check (ccw_req_t * erp, char *sense) { dasd_device_t *device = erp->device; erp->function = dasd_3990_erp_equip_check; if (sense[2] & SNS2_ENV_DATA_PRESENT) { DASD_MESSAGE (KERN_WARNING, device, "%s", "Equipment Check - environmental data present"); erp = dasd_3990_erp_action_4 (erp, sense); } 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 */ ccw_req_t * dasd_3990_erp_data_check (ccw_req_t * erp, char *sense) { dasd_device_t *device = erp->device; erp->function = dasd_3990_erp_data_check; if (sense[2] & SNS2_ENV_DATA_PRESENT) { DASD_MESSAGE (KERN_WARNING, device, "%s", "Uncorrectable data check recovered secondary " "addr of duplex pair"); erp = dasd_3990_erp_action_4 (erp, sense); } return erp; } /* end dasd_3990_erp_data_check */ /* * 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 */ ccw_req_t * dasd_3990_erp_inv_format (ccw_req_t * erp, char *sense) { dasd_device_t *device = erp->device; erp->function = dasd_3990_erp_inv_format; if (sense[2] & SNS2_ENV_DATA_PRESENT) { DASD_MESSAGE (KERN_WARNING, device, "%s", "Track format error when destaging or " "staging data"); erp = dasd_3990_erp_action_4 (erp, sense); } return erp; } /* end dasd_3990_erp_inv_format */ /* * 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 */ ccw_req_t * dasd_3990_erp_env_data (ccw_req_t * erp, char *sense) { dasd_device_t *device = erp->device; erp->function = dasd_3990_erp_env_data; DASD_MESSAGE (KERN_WARNING, device, "%s", "Environmental data present"); erp = dasd_3990_erp_action_4 (erp, sense); return erp; } /* end dasd_3990_erp_env_data */ /* * 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 */ ccw_req_t * dasd_3990_erp_inspect_24 ( ccw_req_t * erp, char *sense) { ccw_req_t *erp_filled = NULL; /* Check sense for .... */ /* '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); } /* 'Invalid Track Format' */ if ((erp_filled == NULL) && (sense[1] & SNS1_INV_TRACK_FORMAT)) { erp_filled = dasd_3990_erp_inv_format (erp, sense); } /* 'Environmental Data' */ if ((erp_filled == NULL) && (sense[2] & SNS2_ENV_DATA_PRESENT)) { erp_filled = dasd_3990_erp_env_data (erp, sense); } /* other (unknown/not jet implemented) error - do default ERP */ if (erp_filled == NULL) { printk (KERN_WARNING PRINTK_HEADER "default ERP taken\n"); erp_filled = erp; } return erp_filled; } /* END dasd_3990_erp_inspect_24 */ /* ***************************************************************************** * 32 byte sense ERP functions (only) ***************************************************************************** */ /* * 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 created default erp. * sense current sense data * RETURN VALUES * erp new erp or default_erp in case of error */ ccw_req_t * dasd_3990_erp_action_1B_32 (ccw_req_t *default_erp, char *sense) { dasd_device_t *device = default_erp->device; ccw_req_t *cqr; ccw_req_t *erp; __u32 cpa; DE_eckd_data_t *DE_data; char *LO_data; /* LO_eckd_data_t */ ccw1_t *ccw; DASD_MESSAGE (KERN_WARNING, device, "%s", "Write not finsihed because of unexpected condition"); /* determine the original cqr */ cqr = default_erp; while (cqr->refers != NULL){ cqr = cqr->refers; } /* determine the address of the CCW to be restarted */ cpa = default_erp->refers->dstat->cpa; if (cpa == 0) { cpa = (__u32) cqr->cpaddr; } if (cpa == 0) { DASD_MESSAGE (KERN_WARNING, device, "%s", "Unable to determine address of the CCW " "to be restarted"); atomic_compare_and_swap_debug (&default_erp->status, CQR_STATUS_FILLED, CQR_STATUS_FAILED); return default_erp; } /* Build new ERP request including DE/LO */ erp = dasd_alloc_request ((char *) &cqr->magic, 2 + 1, /* DE/LO + TIC */ sizeof (DE_eckd_data_t) + sizeof (LO_eckd_data_t)); if ( !erp ) { DASD_MESSAGE (KERN_WARNING, device, "%s", "Unable to allocate ERP"); atomic_compare_and_swap_debug (&default_erp->status, CQR_STATUS_FILLED, CQR_STATUS_FAILED); return default_erp; } /* use original DE */ DE_data = erp->data; memcpy (DE_data, cqr->data, sizeof (DE_eckd_data_t)); /* create LO */ LO_data = erp->data + sizeof (DE_eckd_data_t); if ((sense[3] == 0x01) && (LO_data[1] & 0x01) ){ DASD_MESSAGE (KERN_WARNING, device, "%s", "BUG - this should not happen"); //BUG(); /* check for read count suffixing n.a. */ } 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 (ccw1_t)); ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT; ccw->flags = CCW_FLAG_CC; ccw->count = 16; ccw->cda = (__u32) __pa (DE_data); /* create LO ccw */ ccw++; memset (ccw, 0, sizeof (ccw1_t)); ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD; ccw->flags = CCW_FLAG_CC; ccw->count = 16; ccw->cda = (__u32) __pa (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->lpm = 0xFF; erp->expires = 0; erp->retries = 2; atomic_set(&erp->status, CQR_STATUS_FILLED); /* remove the default erp */ dasd_free_request (default_erp); return erp; } /* end dasd_3990_erp_action_1B_32 */ /* * 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 * */ ccw_req_t * dasd_3990_erp_inspect_32 ( ccw_req_t *erp, char *sense ) { dasd_device_t *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') */ printk (KERN_WARNING PRINTK_HEADER "default ERP taken\n"); } else { /* single program action codes (byte25 bit 0 == '0') */ switch (sense[25]) { case 0x1B: /* unexpected condition during write */ erp = dasd_3990_erp_action_1B_32 (erp, sense); #ifdef ERP_DEBUG /* TBD */ // cpcmd ("STOP", NULL, 0); #endif break; case 0x1D: /* state-change pending */ DASD_MESSAGE (KERN_WARNING, device, "%s", "A State change pending condition exists " "for the subsystem or device"); erp = dasd_3990_erp_action_4 (erp, sense); // cpcmd ("STOP", NULL, 0); break; default: /* all others errors */ printk (KERN_WARNING PRINTK_HEADER "default ERP taken\n"); } } 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 */ ccw_req_t * dasd_3990_erp_inspect (ccw_req_t * erp) { ccw_req_t *erp_new = NULL; /* sense data are located in the refers record of the */ /* already set up new ERP ! */ char *sense = erp->refers->dstat->ii.sense.data; /* 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; } /* END dasd_3990_erp_inspect */ /* * 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 */ ccw_req_t * dasd_3990_erp_add_erp (ccw_req_t * cqr) { /* allocate additional request block */ ccw_req_t *erp = dasd_alloc_request ((char *) &cqr->magic, 1, 0); if ( !erp ) { printk( KERN_WARNING PRINTK_HEADER "unable to allocate ERP request\n" ); return NULL; } /* initialize request with default TIC to current ERP/CQR */ erp->cpaddr->cmd_code = CCW_CMD_TIC; erp->cpaddr->cda = ((__u32) cqr->cpaddr); erp->function = dasd_3990_erp_add_erp; erp->refers = cqr; erp->device = cqr->device; erp->magic = cqr->magic; erp->lpm = 0xFF; erp->expires = 0; erp->retries = 255; atomic_set(&erp->status, CQR_STATUS_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 */ ccw_req_t * dasd_3990_erp_additional_erp (ccw_req_t * cqr) { ccw_req_t *erp = NULL; /* add erp and initialize with default TIC */ erp = dasd_3990_erp_add_erp (cqr); /* inspect sense, determine specific ERP if possible */ erp = dasd_3990_erp_inspect (erp); return erp; } /* end dasd_3990_erp_additional_erp */ /* * DASD_3990_ERP_ERROR_MATCH * * DESCRIPTION * check if the 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 becaus 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. */ int dasd_3990_erp_error_match (ccw_req_t * cqr1, ccw_req_t * cqr2) { /* check failed CCW */ if (cqr1->dstat->cpa != cqr2->dstat->cpa) { return 0; /* CCW doesn't match */ } /* check sense data; byte 0-2,25,27 */ if (!((strncmp (cqr1->dstat->ii.sense.data, cqr2->dstat->ii.sense.data, 3) == 0) && (cqr1->dstat->ii.sense.data[27] == cqr2->dstat->ii.sense.data[27] ) && (cqr1->dstat->ii.sense.data[25] == cqr2->dstat->ii.sense.data[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. */ ccw_req_t * dasd_3990_erp_in_erp (ccw_req_t * cqr) { ccw_req_t *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 == 0)); if (match) { /* TBD */ printk(KERN_WARNING PRINTK_HEADER "dasd_3990_erp_in_erp: return matching erp\n"); return erp_match; /* retrun address of matching erp */ } else { printk(KERN_WARNING PRINTK_HEADER "dasd_3990_erp_in_erp: return no match\n"); return NULL; /* return NULL to indicate that no match was found */ } } /* 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 wiht no retry left * * RETURN VALUES * erp modified/additional ERP */ ccw_req_t * dasd_3990_erp_further_erp (ccw_req_t * erp) { dasd_device_t *device = erp->device; /* check for 24 byte sense ERP */ if ((erp->function == dasd_3990_erp_action_1) || (erp->function == dasd_3990_erp_action_4) ){ erp = dasd_3990_erp_action_1 (erp); } else { /* no retry left and no additional special handling necessary */ DASD_MESSAGE (KERN_WARNING, device, "no retries left for erp %p - " "set status to FAILED", erp); atomic_compare_and_swap_debug (&erp->status, CQR_STATUS_ERROR, CQR_STATUS_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 set to status DONE and the retry counter is * decremented. * If retry counter is already 0, it has to checked if further action * is needed (besides retry) or if the ERP has failed. * * PARAMETER * erp_head first ERP in ERP-chain * erp_match ERP that handles the actual error. * * RETURN VALUES * none */ void dasd_3990_erp_handle_match_erp (ccw_req_t * erp_head, ccw_req_t * erp_match) { dasd_device_t *device = erp_head->device; ccw_req_t *erp_done = erp_head; /* loop over successful ERPs and remove them from chanq */ while ((erp_done != erp_match) && (erp_done != NULL)) { #ifdef ERP_DEBUG printk (KERN_WARNING PRINTK_HEADER "successful ERP - dequeue and free request %p\n", (void *) erp_done); #endif atomic_compare_and_swap_debug (&erp_done->status, CQR_STATUS_ERROR, CQR_STATUS_DONE); /* remove the request from the device queue */ dasd_chanq_deq (&device->queue, erp_done); /* free the finished erp request */ dasd_free_request (erp_done); erp_done = erp_done->refers; } if (erp_done == NULL) /* erp_done should never be NULL! */ panic (PRINTK_HEADER "Programming error in ERP! The original " "request was lost\n"); #ifdef ERP_DEBUG /* handle matching ERP */ printk (KERN_WARNING PRINTK_HEADER "handle matching erp %p\n", (void *) erp_done); #endif if (erp_done->retries > 0) { /* check for special retries */ if (erp_done->function == dasd_3990_erp_action_4) { char *sense = erp_done->dstat->ii.sense.data; erp_done = dasd_3990_erp_action_4 (erp_done, sense); } else { /* simple retry */ printk (KERN_WARNING PRINTK_HEADER "%i retries left for erp %p\n", erp_done->retries, (void *) erp_done); /* handle the request again... */ atomic_compare_and_swap_debug (&erp_done->status, CQR_STATUS_ERROR, CQR_STATUS_QUEUED); } } else { /* no retry left - check for further necessary action */ /* if no further actions, handle rest as permanent error */ erp_done = dasd_3990_erp_further_erp (erp_done); } erp_head = erp_done; } /* 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) */ ccw_req_t * dasd_3990_erp_action (ccw_req_t *cqr) { ccw_req_t *erp = NULL; dasd_device_t *device = cqr->device; #ifdef ERP_DEBUG printk (KERN_WARNING PRINTK_HEADER "entering 3990 ERP for " "0x%04X on sch %d = /dev/%s \n", device->devinfo.devno, device->devinfo.irq, device->name); /* print current erp_chain */ printk(KERN_WARNING PRINTK_HEADER "ERP chain at BEGINNING of ERP-ACTION\n"); { ccw_req_t *temp_erp = NULL; for (temp_erp = cqr; temp_erp != NULL; temp_erp = temp_erp->refers){ printk(KERN_WARNING PRINTK_HEADER " erp %p refers to %p \n", temp_erp, temp_erp->refers); } } #endif /* double-check if current erp/cqr was successfull */ if ((cqr->dstat->cstat == 0x00) && (cqr->dstat->dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END))) { DASD_MESSAGE (KERN_WARNING, device, "ERP called for successful request %p" " - NO ERP necessary", cqr); atomic_compare_and_swap_debug (&erp->status, CQR_STATUS_ERROR, CQR_STATUS_DONE); return cqr; } /* check if sense data are available */ if (!cqr->dstat->ii.sense.data) { DASD_MESSAGE (KERN_WARNING, device, "ERP called witout sense data avail ..." "request %p - NO ERP possible", cqr); atomic_compare_and_swap_debug (&erp->status, CQR_STATUS_ERROR, CQR_STATUS_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 */ dasd_3990_erp_handle_match_erp (cqr, erp); erp = cqr; } #ifdef ERP_DEBUG /* print current erp_chain */ printk(KERN_WARNING PRINTK_HEADER "ERP chain at END of ERP-ACTION\n"); { ccw_req_t *temp_erp = NULL; for (temp_erp = erp; temp_erp != NULL; temp_erp = temp_erp->refers){ printk(KERN_WARNING PRINTK_HEADER " erp %p refers to %p \n", temp_erp, temp_erp->refers); } } #endif 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: nil * tab-width: 8 * End: */ |