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[S390] cio: improve error recovery for internal I/Os

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Improve error recovery for internal I/Os by repeating each I/O
256 times per path to cope with long-running non-permanent error
conditions. Also retry each path twice to cope with link flapping,
i.e. single paths becoming unavailable in the order in which they
are tried.

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Peter Oberparleiter 2009-12-07 12:51:40 +01:00 committed by Martin Schwidefsky
parent 7a8ad1001c
commit de1b04388f
4 changed files with 7 additions and 6 deletions
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7
drivers/s390/cio/ccwreq.c
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@ -82,7 +82,7 @@ static void ccwreq_do(struct ccw_device *cdev)
/* Perform start function. */
sch->lpm = 0xff;
memset(&cdev->private->irb, 0, sizeof(struct irb));
rc = cio_start(sch, cp, req->mask);
rc = cio_start(sch, cp, (u8) req->mask);
if (rc == 0) {
/* I/O started successfully. */
ccw_device_set_timeout(cdev, req->timeout);
@ -116,7 +116,8 @@ void ccw_request_start(struct ccw_device *cdev)
{
struct ccw_request *req = &cdev->private->req;
req->mask = 0x80;
/* Try all paths twice to counter link flapping. */
req->mask = 0x8080;
req->retries = req->maxretries;
req->mask = lpm_adjust(req->mask, req->lpm);
req->drc = 0;
@ -212,7 +213,7 @@ static void ccwreq_log_status(struct ccw_device *cdev, enum io_status status)
} __attribute__ ((packed)) data;
data.dev_id = cdev->private->dev_id;
data.retries = req->retries;
data.lpm = req->mask;
data.lpm = (u8) req->mask;
data.status = (u8) status;
CIO_TRACE_EVENT(2, "reqstat");
CIO_HEX_EVENT(2, &data, sizeof(data));

2
drivers/s390/cio/device_id.c
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@ -21,7 +21,7 @@
#include "device.h"
#include "io_sch.h"
#define SENSE_ID_RETRIES 5
#define SENSE_ID_RETRIES 256
#define SENSE_ID_TIMEOUT (10 * HZ)
#define SENSE_ID_MIN_LEN 4
#define SENSE_ID_BASIC_LEN 7

2
drivers/s390/cio/device_pgid.c
View File

@ -20,7 +20,7 @@
#include "device.h"
#include "io_sch.h"
#define PGID_RETRIES 5
#define PGID_RETRIES 256
#define PGID_TIMEOUT (10 * HZ)
/*

2
drivers/s390/cio/io_sch.h
View File

@ -109,7 +109,7 @@ struct ccw_request {
void (*callback)(struct ccw_device *, void *, int);
void *data;
/* These fields are used internally. */
u8 mask;
u16 mask;
u16 retries;
int drc;
int cancel:1;