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original_kernel/drivers/s390/block/dasd_erp.c

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/*
* File...........: linux/drivers/s390/block/dasd.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>
* (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001
*
*/
#include <linux/config.h>
#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));
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->device;
/* just retry - there is nothing to save ... I got no sense data.... */
if (cqr->retries > 0) {
DEV_MESSAGE (KERN_DEBUG, device,
"default ERP called (%i retries left)",
cqr->retries);
cqr->lpm = LPM_ANYPATH;
cqr->status = DASD_CQR_QUEUED;
} else {
DEV_MESSAGE (KERN_WARNING, device, "%s",
"default ERP called (NO retry left)");
cqr->status = DASD_CQR_FAILED;
cqr->stopclk = get_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)
{
struct dasd_device *device;
int success;
BUG_ON(cqr->refers == NULL || cqr->function == NULL);
device = cqr->device;
success = cqr->status == DASD_CQR_DONE;
/* 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 device queue */
list_del(&cqr->list);
/* free the finished erp request */
dasd_free_erp_request(cqr, device);
cqr = refers;
}
/* set corresponding status to original cqr */
if (success)
cqr->status = DASD_CQR_DONE;
else {
cqr->status = DASD_CQR_FAILED;
cqr->stopclk = get_clock();
}
return cqr;
} /* end default_erp_postaction */
/*
* Print the hex dump of the memory used by a request. This includes
* all error recovery ccws that have been chained in from of the
* real request.
*/
static inline void
hex_dump_memory(struct dasd_device *device, void *data, int len)
{
int *pint;
pint = (int *) data;
while (len > 0) {
DEV_MESSAGE(KERN_ERR, device, "%p: %08x %08x %08x %08x",
pint, pint[0], pint[1], pint[2], pint[3]);
pint += 4;
len -= 16;
}
}
void
dasd_log_sense(struct dasd_ccw_req *cqr, struct irb *irb)
{
struct dasd_device *device;
device = cqr->device;
/* dump sense data */
if (device->discipline && device->discipline->dump_sense)
device->discipline->dump_sense(device, cqr, irb);
}
void
dasd_log_ccw(struct dasd_ccw_req * cqr, int caller, __u32 cpa)
{
struct dasd_device *device;
struct dasd_ccw_req *lcqr;
struct ccw1 *ccw;
int cplength;
device = cqr->device;
/* log the channel program */
for (lcqr = cqr; lcqr != NULL; lcqr = lcqr->refers) {
DEV_MESSAGE(KERN_ERR, device,
"(%s) ERP chain report for req: %p",
caller == 0 ? "EXAMINE" : "ACTION", lcqr);
hex_dump_memory(device, lcqr, sizeof(struct dasd_ccw_req));
cplength = 1;
ccw = lcqr->cpaddr;
while (ccw++->flags & (CCW_FLAG_DC | CCW_FLAG_CC))
cplength++;
if (cplength > 40) { /* log only parts of the CP */
DEV_MESSAGE(KERN_ERR, device, "%s",
"Start of channel program:");
hex_dump_memory(device, lcqr->cpaddr,
40*sizeof(struct ccw1));
DEV_MESSAGE(KERN_ERR, device, "%s",
"End of channel program:");
hex_dump_memory(device, lcqr->cpaddr + cplength - 10,
10*sizeof(struct ccw1));
} else { /* log the whole CP */
DEV_MESSAGE(KERN_ERR, device, "%s",
"Channel program (complete):");
hex_dump_memory(device, lcqr->cpaddr,
cplength*sizeof(struct ccw1));
}
if (lcqr != cqr)
continue;
/*
* Log bytes arround failed CCW but only if we did
* not log the whole CP of the CCW is outside the
* logged CP.
*/
if (cplength > 40 ||
((addr_t) cpa < (addr_t) lcqr->cpaddr &&
(addr_t) cpa > (addr_t) (lcqr->cpaddr + cplength + 4))) {
DEV_MESSAGE(KERN_ERR, device,
"Failed CCW (%p) (area):",
(void *) (long) cpa);
hex_dump_memory(device, cqr->cpaddr - 10,
20*sizeof(struct ccw1));
}
}
} /* end log_erp_chain */
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);
EXPORT_SYMBOL(dasd_log_ccw);
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