diff options
Diffstat (limited to 'kernel/drivers/s390/block/dasd_erp.c')
| -rw-r--r-- | kernel/drivers/s390/block/dasd_erp.c | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/kernel/drivers/s390/block/dasd_erp.c b/kernel/drivers/s390/block/dasd_erp.c new file mode 100644 index 000000000..e1e88486b --- /dev/null +++ b/kernel/drivers/s390/block/dasd_erp.c @@ -0,0 +1,202 @@ +/* + * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> + * Horst Hummel <Horst.Hummel@de.ibm.com> + * Carsten Otte <Cotte@de.ibm.com> + * Martin Schwidefsky <schwidefsky@de.ibm.com> + * Bugreports.to..: <Linux390@de.ibm.com> + * Copyright IBM Corp. 1999, 2001 + * + */ + +#define KMSG_COMPONENT "dasd" + +#include <linux/ctype.h> +#include <linux/init.h> + +#include <asm/debug.h> +#include <asm/ebcdic.h> +#include <asm/uaccess.h> + +/* This is ugly... */ +#define PRINTK_HEADER "dasd_erp:" + +#include "dasd_int.h" + +struct dasd_ccw_req * +dasd_alloc_erp_request(char *magic, int cplength, int datasize, + struct dasd_device * device) +{ + unsigned long flags; + struct dasd_ccw_req *cqr; + char *data; + int size; + + /* Sanity checks */ + BUG_ON( magic == NULL || datasize > PAGE_SIZE || + (cplength*sizeof(struct ccw1)) > PAGE_SIZE); + + size = (sizeof(struct dasd_ccw_req) + 7L) & -8L; + if (cplength > 0) + size += cplength * sizeof(struct ccw1); + if (datasize > 0) + size += datasize; + spin_lock_irqsave(&device->mem_lock, flags); + cqr = (struct dasd_ccw_req *) + dasd_alloc_chunk(&device->erp_chunks, size); + spin_unlock_irqrestore(&device->mem_lock, flags); + if (cqr == NULL) + return ERR_PTR(-ENOMEM); + memset(cqr, 0, sizeof(struct dasd_ccw_req)); + INIT_LIST_HEAD(&cqr->devlist); + INIT_LIST_HEAD(&cqr->blocklist); + data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L); + cqr->cpaddr = NULL; + if (cplength > 0) { + cqr->cpaddr = (struct ccw1 *) data; + data += cplength*sizeof(struct ccw1); + memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1)); + } + cqr->data = NULL; + if (datasize > 0) { + cqr->data = data; + memset(cqr->data, 0, datasize); + } + strncpy((char *) &cqr->magic, magic, 4); + ASCEBC((char *) &cqr->magic, 4); + set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); + dasd_get_device(device); + return cqr; +} + +void +dasd_free_erp_request(struct dasd_ccw_req *cqr, struct dasd_device * device) +{ + unsigned long flags; + + spin_lock_irqsave(&device->mem_lock, flags); + dasd_free_chunk(&device->erp_chunks, cqr); + spin_unlock_irqrestore(&device->mem_lock, flags); + atomic_dec(&device->ref_count); +} + + +/* + * dasd_default_erp_action just retries the current cqr + */ +struct dasd_ccw_req * +dasd_default_erp_action(struct dasd_ccw_req *cqr) +{ + struct dasd_device *device; + + device = cqr->startdev; + + /* just retry - there is nothing to save ... I got no sense data.... */ + if (cqr->retries > 0) { + DBF_DEV_EVENT(DBF_DEBUG, device, + "default ERP called (%i retries left)", + cqr->retries); + if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) + cqr->lpm = device->path_data.opm; + cqr->status = DASD_CQR_FILLED; + } else { + pr_err("%s: default ERP has run out of retries and failed\n", + dev_name(&device->cdev->dev)); + cqr->status = DASD_CQR_FAILED; + cqr->stopclk = get_tod_clock(); + } + return cqr; +} /* end dasd_default_erp_action */ + +/* + * DESCRIPTION + * Frees all ERPs of the current ERP Chain and set the status + * of the original CQR either to DASD_CQR_DONE if ERP was successful + * or to DASD_CQR_FAILED if ERP was NOT successful. + * NOTE: This function is only called if no discipline postaction + * is available + * + * PARAMETER + * erp current erp_head + * + * RETURN VALUES + * cqr pointer to the original CQR + */ +struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *cqr) +{ + int success; + unsigned long long startclk, stopclk; + struct dasd_device *startdev; + + BUG_ON(cqr->refers == NULL || cqr->function == NULL); + + success = cqr->status == DASD_CQR_DONE; + startclk = cqr->startclk; + stopclk = cqr->stopclk; + startdev = cqr->startdev; + + /* free all ERPs - but NOT the original cqr */ + while (cqr->refers != NULL) { + struct dasd_ccw_req *refers; + + refers = cqr->refers; + /* remove the request from the block queue */ + list_del(&cqr->blocklist); + /* free the finished erp request */ + dasd_free_erp_request(cqr, cqr->memdev); + cqr = refers; + } + + /* set corresponding status to original cqr */ + cqr->startclk = startclk; + cqr->stopclk = stopclk; + cqr->startdev = startdev; + if (success) + cqr->status = DASD_CQR_DONE; + else { + cqr->status = DASD_CQR_FAILED; + cqr->stopclk = get_tod_clock(); + } + + return cqr; + +} /* end default_erp_postaction */ + +void +dasd_log_sense(struct dasd_ccw_req *cqr, struct irb *irb) +{ + struct dasd_device *device; + + device = cqr->startdev; + if (cqr->intrc == -ETIMEDOUT) { + dev_err(&device->cdev->dev, + "A timeout error occurred for cqr %p", cqr); + return; + } + if (cqr->intrc == -ENOLINK) { + dev_err(&device->cdev->dev, + "A transport error occurred for cqr %p", cqr); + return; + } + /* dump sense data */ + if (device->discipline && device->discipline->dump_sense) + device->discipline->dump_sense(device, cqr, irb); +} + +void +dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb) +{ + struct dasd_device *device; + + device = cqr->startdev; + /* dump sense data to s390 debugfeature*/ + if (device->discipline && device->discipline->dump_sense_dbf) + device->discipline->dump_sense_dbf(device, irb, "log"); +} +EXPORT_SYMBOL(dasd_log_sense_dbf); + +EXPORT_SYMBOL(dasd_default_erp_action); +EXPORT_SYMBOL(dasd_default_erp_postaction); +EXPORT_SYMBOL(dasd_alloc_erp_request); +EXPORT_SYMBOL(dasd_free_erp_request); +EXPORT_SYMBOL(dasd_log_sense); + |