cregit-Linux how code gets into the kernel

Release 4.11 drivers/s390/block/dasd_erp.c

/*
 * 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 <linux/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; }

Contributors

PersonTokensPropCommitsCommitProp
Martin Schwidefsky30791.37%350.00%
Stefan Weinhuber164.76%116.67%
Andrew Morton102.98%116.67%
Eric Sesterhenn / Snakebyte30.89%116.67%
Total336100.00%6100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Martin Schwidefsky57100.00%2100.00%
Total57100.00%2100.00%

/* * 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 = dasd_path_get_opm(device); 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; }

Contributors

PersonTokensPropCommitsCommitProp
Martin Schwidefsky7165.14%330.00%
Stefan Weinhuber2119.27%330.00%
Stefan Haberland1614.68%330.00%
Heiko Carstens10.92%110.00%
Total109100.00%10100.00%

/* 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; }

Contributors

PersonTokensPropCommitsCommitProp
Martin Schwidefsky10464.60%233.33%
Stefan Weinhuber5332.92%233.33%
Eric Sesterhenn / Snakebyte31.86%116.67%
Heiko Carstens10.62%116.67%
Total161100.00%6100.00%

/* 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\n", cqr); return; } if (cqr->intrc == -ENOLINK) { dev_err(&device->cdev->dev, "A transport error occurred for cqr %p\n", cqr); return; } /* dump sense data */ if (device->discipline && device->discipline->dump_sense) device->discipline->dump_sense(device, cqr, irb); }

Contributors

PersonTokensPropCommitsCommitProp
Martin Schwidefsky5149.04%350.00%
Hannes Reinecke5048.08%116.67%
Colin Ian King21.92%116.67%
Stefan Weinhuber10.96%116.67%
Total104100.00%6100.00%


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"); }

Contributors

PersonTokensPropCommitsCommitProp
Stefan Haberland52100.00%1100.00%
Total52100.00%1100.00%

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);

Overall Contributors

PersonTokensPropCommitsCommitProp
Martin Schwidefsky64172.76%422.22%
Stefan Weinhuber9110.33%422.22%
Stefan Haberland778.74%316.67%
Hannes Reinecke505.68%15.56%
Andrew Morton101.14%15.56%
Eric Sesterhenn / Snakebyte60.68%15.56%
Heiko Carstens30.34%211.11%
Colin Ian King20.23%15.56%
Linus Torvalds10.11%15.56%
Total881100.00%18100.00%
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