linux/drivers/s390/block/dasd_erp.c
Stefan Weinhuber fbd70035fb s390/dasd: fix statistics for recovered requests
When a recovery cqr is cleaned up, copy the start time, stop time,
and start device to the original cqr. These times are needed later
when the original request is finalized and counted in the DASD
statistics.

Signed-off-by: Stefan Weinhuber <wein@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2013-08-28 09:19:34 +02:00

203 lines
5.2 KiB
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 <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);