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android_kernel_xiaomi_sm8350/drivers/s390/block/dasd_3990_erp.c
Stefan Haberland 6c5f57c788 [S390] dasd: add ifcc handling 
Adding interface control check (ifcc) handling in error recovery.
First retry up to 255 times and if all retries fail try an alternate
path if possible.

Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2008-02-05 16:50:59 +01:00

2640 lines
66 KiB
C
Raw Blame History

/*
* File...........: linux/drivers/s390/block/dasd_3990_erp.c
* Author(s)......: Horst Hummel <Horst.Hummel@de.ibm.com>
* Holger Smolinski <Holger.Smolinski@de.ibm.com>
* Bugreports.to..: <Linux390@de.ibm.com>
* (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 2000, 2001
*
*/
#include <linux/timer.h>
#include <linux/slab.h>
#include <asm/idals.h>
#include <asm/todclk.h>
#define PRINTK_HEADER "dasd_erp(3990): "
#include "dasd_int.h"
#include "dasd_eckd.h"
struct DCTL_data {
unsigned char subcommand; /* e.g Inhibit Write, Enable Write,... */
unsigned char modifier; /* Subcommand modifier */
unsigned short res; /* reserved */
} __attribute__ ((packed));
/*
*****************************************************************************
* SECTION ERP HANDLING
*****************************************************************************
*/
/*
*****************************************************************************
* 24 and 32 byte sense ERP functions
*****************************************************************************
*/
/*
* DASD_3990_ERP_CLEANUP
*
* DESCRIPTION
* Removes the already build but not necessary ERP request and sets
* the status of the original cqr / erp to the given (final) status
*
* PARAMETER
* erp request to be blocked
* final_status either DASD_CQR_DONE or DASD_CQR_FAILED
*
* RETURN VALUES
* cqr original cqr
*/
static struct dasd_ccw_req *
dasd_3990_erp_cleanup(struct dasd_ccw_req * erp, char final_status)
{
struct dasd_ccw_req *cqr = erp->refers;
dasd_free_erp_request(erp, erp->memdev);
cqr->status = final_status;
return cqr;
} /* end dasd_3990_erp_cleanup */
/*
* DASD_3990_ERP_BLOCK_QUEUE
*
* DESCRIPTION
* Block the given device request queue to prevent from further
* processing until the started timer has expired or an related
* interrupt was received.
*/
static void
dasd_3990_erp_block_queue(struct dasd_ccw_req * erp, int expires)
{
struct dasd_device *device = erp->startdev;
unsigned long flags;
DEV_MESSAGE(KERN_INFO, device,
"blocking request queue for %is", expires/HZ);
spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
device->stopped |= DASD_STOPPED_PENDING;
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
erp->status = DASD_CQR_FILLED;
dasd_block_set_timer(device->block, expires);
}
/*
* DASD_3990_ERP_INT_REQ
*
* DESCRIPTION
* Handles 'Intervention Required' error.
* This means either device offline or not installed.
*
* PARAMETER
* erp current erp
* RETURN VALUES
* erp modified erp
*/
static struct dasd_ccw_req *
dasd_3990_erp_int_req(struct dasd_ccw_req * erp)
{
struct dasd_device *device = erp->startdev;
/* first time set initial retry counter and erp_function */
/* and retry once without blocking queue */
/* (this enables easier enqueing of the cqr) */
if (erp->function != dasd_3990_erp_int_req) {
erp->retries = 256;
erp->function = dasd_3990_erp_int_req;
} else {
/* issue a message and wait for 'device ready' interrupt */
DEV_MESSAGE(KERN_ERR, device, "%s",
"is offline or not installed - "
"INTERVENTION REQUIRED!!");
dasd_3990_erp_block_queue(erp, 60*HZ);
}
return erp;
} /* end dasd_3990_erp_int_req */
/*
* DASD_3990_ERP_ALTERNATE_PATH
*
* DESCRIPTION
* Repeat the operation on a different channel path.
* If all alternate paths have been tried, the request is posted with a
* permanent error.
*
* PARAMETER
* erp pointer to the current ERP
*
* RETURN VALUES
* erp modified pointer to the ERP
*/
static void
dasd_3990_erp_alternate_path(struct dasd_ccw_req * erp)
{
struct dasd_device *device = erp->startdev;
__u8 opm;
unsigned long flags;
/* try alternate valid path */
spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
opm = ccw_device_get_path_mask(device->cdev);
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
//FIXME: start with get_opm ?
if (erp->lpm == 0)
erp->lpm = LPM_ANYPATH & ~(erp->irb.esw.esw0.sublog.lpum);
else
erp->lpm &= ~(erp->irb.esw.esw0.sublog.lpum);
if ((erp->lpm & opm) != 0x00) {
DEV_MESSAGE(KERN_DEBUG, device,
"try alternate lpm=%x (lpum=%x / opm=%x)",
erp->lpm, erp->irb.esw.esw0.sublog.lpum, opm);
/* reset status to submit the request again... */
erp->status = DASD_CQR_FILLED;
erp->retries = 10;
} else {
DEV_MESSAGE(KERN_ERR, device,
"No alternate channel path left (lpum=%x / "
"opm=%x) -> permanent error",
erp->irb.esw.esw0.sublog.lpum, opm);
/* post request with permanent error */
erp->status = DASD_CQR_FAILED;
}
} /* end dasd_3990_erp_alternate_path */
/*
* DASD_3990_ERP_DCTL
*
* DESCRIPTION
* Setup cqr to do the Diagnostic Control (DCTL) command with an
* Inhibit Write subcommand (0x20) and the given modifier.
*
* PARAMETER
* erp pointer to the current (failed) ERP
* modifier subcommand modifier
*
* RETURN VALUES
* dctl_cqr pointer to NEW dctl_cqr
*
*/
static struct dasd_ccw_req *
dasd_3990_erp_DCTL(struct dasd_ccw_req * erp, char modifier)
{
struct dasd_device *device = erp->startdev;
struct DCTL_data *DCTL_data;
struct ccw1 *ccw;
struct dasd_ccw_req *dctl_cqr;
dctl_cqr = dasd_alloc_erp_request((char *) &erp->magic, 1,
sizeof(struct DCTL_data),
device);
if (IS_ERR(dctl_cqr)) {
DEV_MESSAGE(KERN_ERR, device, "%s",
"Unable to allocate DCTL-CQR");
erp->status = DASD_CQR_FAILED;
return erp;
}
DCTL_data = dctl_cqr->data;
DCTL_data->subcommand = 0x02; /* Inhibit Write */
DCTL_data->modifier = modifier;
ccw = dctl_cqr->cpaddr;
memset(ccw, 0, sizeof(struct ccw1));
ccw->cmd_code = CCW_CMD_DCTL;
ccw->count = 4;
ccw->cda = (__u32)(addr_t) DCTL_data;
dctl_cqr->function = dasd_3990_erp_DCTL;
dctl_cqr->refers = erp;
dctl_cqr->startdev = device;
dctl_cqr->memdev = device;
dctl_cqr->magic = erp->magic;
dctl_cqr->expires = 5 * 60 * HZ;
dctl_cqr->retries = 2;
dctl_cqr->buildclk = get_clock();
dctl_cqr->status = DASD_CQR_FILLED;
return dctl_cqr;
} /* end dasd_3990_erp_DCTL */
/*
* DASD_3990_ERP_ACTION_1
*
* DESCRIPTION
* Setup ERP to do the ERP action 1 (see Reference manual).
* Repeat the operation on a different channel path.
* If all alternate paths have been tried, the request is posted with a
* permanent error.
* Note: duplex handling is not implemented (yet).
*
* PARAMETER
* erp pointer to the current ERP
*
* RETURN VALUES
* erp pointer to the ERP
*
*/
static struct dasd_ccw_req *
dasd_3990_erp_action_1(struct dasd_ccw_req * erp)
{
erp->function = dasd_3990_erp_action_1;
dasd_3990_erp_alternate_path(erp);
return erp;
} /* end dasd_3990_erp_action_1 */
/*
* DASD_3990_ERP_ACTION_4
*
* DESCRIPTION
* Setup ERP to do the ERP action 4 (see Reference manual).
* Set the current request to PENDING to block the CQR queue for that device
* until the state change interrupt appears.
* Use a timer (20 seconds) to retry the cqr if the interrupt is still
* missing.
*
* PARAMETER
* sense sense data of the actual error
* erp pointer to the current ERP
*
* RETURN VALUES
* erp pointer to the ERP
*
*/
static struct dasd_ccw_req *
dasd_3990_erp_action_4(struct dasd_ccw_req * erp, char *sense)
{
struct dasd_device *device = erp->startdev;
/* first time set initial retry counter and erp_function */
/* and retry once without waiting for state change pending */
/* interrupt (this enables easier enqueing of the cqr) */
if (erp->function != dasd_3990_erp_action_4) {
DEV_MESSAGE(KERN_INFO, device, "%s",
"dasd_3990_erp_action_4: first time retry");
erp->retries = 256;
erp->function = dasd_3990_erp_action_4;
} else {
if (sense && (sense[25] == 0x1D)) { /* state change pending */
DEV_MESSAGE(KERN_INFO, device,
"waiting for state change pending "
"interrupt, %d retries left",
erp->retries);
dasd_3990_erp_block_queue(erp, 30*HZ);
} else if (sense && (sense[25] == 0x1E)) { /* busy */
DEV_MESSAGE(KERN_INFO, device,
"busy - redriving request later, "
"%d retries left",
erp->retries);
dasd_3990_erp_block_queue(erp, HZ);
} else {
/* no state change pending - retry */
DEV_MESSAGE (KERN_INFO, device,
"redriving request immediately, "
"%d retries left",
erp->retries);
erp->status = DASD_CQR_FILLED;
}
}
return erp;
} /* end dasd_3990_erp_action_4 */
/*
*****************************************************************************
* 24 byte sense ERP functions (only)
*****************************************************************************
*/
/*
* DASD_3990_ERP_ACTION_5
*
* DESCRIPTION
* Setup ERP to do the ERP action 5 (see Reference manual).
* NOTE: Further handling is done in xxx_further_erp after the retries.
*
* PARAMETER
* erp pointer to the current ERP
*
* RETURN VALUES
* erp pointer to the ERP
*
*/
static struct dasd_ccw_req *
dasd_3990_erp_action_5(struct dasd_ccw_req * erp)
{
/* first of all retry */
erp->retries = 10;
erp->function = dasd_3990_erp_action_5;
return erp;
} /* end dasd_3990_erp_action_5 */
/*
* DASD_3990_HANDLE_ENV_DATA
*
* DESCRIPTION
* Handles 24 byte 'Environmental data present'.
* Does a analysis of the sense data (message Format)
* and prints the error messages.
*
* PARAMETER
* sense current sense data
*
* RETURN VALUES
* void
*/
static void
dasd_3990_handle_env_data(struct dasd_ccw_req * erp, char *sense)
{
struct dasd_device *device = erp->startdev;
char msg_format = (sense[7] & 0xF0);
char msg_no = (sense[7] & 0x0F);
switch (msg_format) {
case 0x00: /* Format 0 - Program or System Checks */
if (sense[1] & 0x10) { /* check message to operator bit */
switch (msg_no) {
case 0x00: /* No Message */
break;
case 0x01:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 0 - Invalid Command");
break;
case 0x02:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 0 - Invalid Command "
"Sequence");
break;
case 0x03:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 0 - CCW Count less than "
"required");
break;
case 0x04:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 0 - Invalid Parameter");
break;
case 0x05:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 0 - Diagnostic of Sepecial"
" Command Violates File Mask");
break;
case 0x07:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 0 - Channel Returned with "
"Incorrect retry CCW");
break;
case 0x08:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 0 - Reset Notification");
break;
case 0x09:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 0 - Storage Path Restart");
break;
case 0x0A:
DEV_MESSAGE(KERN_WARNING, device,
"FORMAT 0 - Channel requested "
"... %02x", sense[8]);
break;
case 0x0B:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 0 - Invalid Defective/"
"Alternate Track Pointer");
break;
case 0x0C:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 0 - DPS Installation "
"Check");
break;
case 0x0E:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 0 - Command Invalid on "
"Secondary Address");
break;
case 0x0F:
DEV_MESSAGE(KERN_WARNING, device,
"FORMAT 0 - Status Not As "
"Required: reason %02x", sense[8]);
break;
default:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 0 - Reseved");
}
} else {
switch (msg_no) {
case 0x00: /* No Message */
break;
case 0x01:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 0 - Device Error Source");
break;
case 0x02:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 0 - Reserved");
break;
case 0x03:
DEV_MESSAGE(KERN_WARNING, device,
"FORMAT 0 - Device Fenced - "
"device = %02x", sense[4]);
break;
case 0x04:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 0 - Data Pinned for "
"Device");
break;
default:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 0 - Reserved");
}
}
break;
case 0x10: /* Format 1 - Device Equipment Checks */
switch (msg_no) {
case 0x00: /* No Message */
break;
case 0x01:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 1 - Device Status 1 not as "
"expected");
break;
case 0x03:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 1 - Index missing");
break;
case 0x04:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 1 - Interruption cannot be reset");
break;
case 0x05:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 1 - Device did not respond to "
"selection");
break;
case 0x06:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 1 - Device check-2 error or Set "
"Sector is not complete");
break;
case 0x07:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 1 - Head address does not "
"compare");
break;
case 0x08:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 1 - Device status 1 not valid");
break;
case 0x09:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 1 - Device not ready");
break;
case 0x0A:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 1 - Track physical address did "
"not compare");
break;
case 0x0B:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 1 - Missing device address bit");
break;
case 0x0C:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 1 - Drive motor switch is off");
break;
case 0x0D:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 1 - Seek incomplete");
break;
case 0x0E:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 1 - Cylinder address did not "
"compare");
break;
case 0x0F:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 1 - Offset active cannot be "
"reset");
break;
default:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 1 - Reserved");
}
break;
case 0x20: /* Format 2 - 3990 Equipment Checks */
switch (msg_no) {
case 0x08:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 2 - 3990 check-2 error");
break;
case 0x0E:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 2 - Support facility errors");
break;
case 0x0F:
DEV_MESSAGE(KERN_WARNING, device,
"FORMAT 2 - Microcode detected error %02x",
sense[8]);
break;
default:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 2 - Reserved");
}
break;
case 0x30: /* Format 3 - 3990 Control Checks */
switch (msg_no) {
case 0x0F:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 3 - Allegiance terminated");
break;
default:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 3 - Reserved");
}
break;
case 0x40: /* Format 4 - Data Checks */
switch (msg_no) {
case 0x00:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 4 - Home address area error");
break;
case 0x01:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 4 - Count area error");
break;
case 0x02:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 4 - Key area error");
break;
case 0x03:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 4 - Data area error");
break;
case 0x04:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 4 - No sync byte in home address "
"area");
break;
case 0x05:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 4 - No sync byte in count address "
"area");
break;
case 0x06:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 4 - No sync byte in key area");
break;
case 0x07:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 4 - No sync byte in data area");
break;
case 0x08:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 4 - Home address area error; "
"offset active");
break;
case 0x09:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 4 - Count area error; offset "
"active");
break;
case 0x0A:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 4 - Key area error; offset "
"active");
break;
case 0x0B:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 4 - Data area error; "
"offset active");
break;
case 0x0C:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 4 - No sync byte in home "
"address area; offset active");
break;
case 0x0D:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 4 - No syn byte in count "
"address area; offset active");
break;
case 0x0E:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 4 - No sync byte in key area; "
"offset active");
break;
case 0x0F:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 4 - No syn byte in data area; "
"offset active");
break;
default:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 4 - Reserved");
}
break;
case 0x50: /* Format 5 - Data Check with displacement information */
switch (msg_no) {
case 0x00:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 5 - Data Check in the "
"home address area");
break;
case 0x01:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 5 - Data Check in the count area");
break;
case 0x02:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 5 - Data Check in the key area");
break;
case 0x03:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 5 - Data Check in the data area");
break;
case 0x08:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 5 - Data Check in the "
"home address area; offset active");
break;
case 0x09:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 5 - Data Check in the count area; "
"offset active");
break;
case 0x0A:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 5 - Data Check in the key area; "
"offset active");
break;
case 0x0B:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 5 - Data Check in the data area; "
"offset active");
break;
default:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 5 - Reserved");
}
break;
case 0x60: /* Format 6 - Usage Statistics/Overrun Errors */
switch (msg_no) {
case 0x00:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 6 - Overrun on channel A");
break;
case 0x01:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 6 - Overrun on channel B");
break;
case 0x02:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 6 - Overrun on channel C");
break;
case 0x03:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 6 - Overrun on channel D");
break;
case 0x04:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 6 - Overrun on channel E");
break;
case 0x05:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 6 - Overrun on channel F");
break;
case 0x06:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 6 - Overrun on channel G");
break;
case 0x07:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 6 - Overrun on channel H");
break;
default:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 6 - Reserved");
}
break;
case 0x70: /* Format 7 - Device Connection Control Checks */
switch (msg_no) {
case 0x00:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 7 - RCC initiated by a connection "
"check alert");
break;
case 0x01:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 7 - RCC 1 sequence not "
"successful");
break;
case 0x02:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 7 - RCC 1 and RCC 2 sequences not "
"successful");
break;
case 0x03:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 7 - Invalid tag-in during "
"selection sequence");
break;
case 0x04:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 7 - extra RCC required");
break;
case 0x05:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 7 - Invalid DCC selection "
"response or timeout");
break;
case 0x06:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 7 - Missing end operation; device "
"transfer complete");
break;
case 0x07:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 7 - Missing end operation; device "
"transfer incomplete");
break;
case 0x08:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 7 - Invalid tag-in for an "
"immediate command sequence");
break;
case 0x09:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 7 - Invalid tag-in for an "
"extended command sequence");
break;
case 0x0A:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 7 - 3990 microcode time out when "
"stopping selection");
break;
case 0x0B:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 7 - No response to selection "
"after a poll interruption");
break;
case 0x0C:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 7 - Permanent path error (DASD "
"controller not available)");
break;
case 0x0D:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 7 - DASD controller not available"
" on disconnected command chain");
break;
default:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 7 - Reserved");
}
break;
case 0x80: /* Format 8 - Additional Device Equipment Checks */
switch (msg_no) {
case 0x00: /* No Message */
case 0x01:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 8 - Error correction code "
"hardware fault");
break;
case 0x03:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 8 - Unexpected end operation "
"response code");
break;
case 0x04:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 8 - End operation with transfer "
"count not zero");
break;
case 0x05:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 8 - End operation with transfer "
"count zero");
break;
case 0x06:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 8 - DPS checks after a system "
"reset or selective reset");
break;
case 0x07:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 8 - DPS cannot be filled");
break;
case 0x08:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 8 - Short busy time-out during "
"device selection");
break;
case 0x09:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 8 - DASD controller failed to "
"set or reset the long busy latch");
break;
case 0x0A:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 8 - No interruption from device "
"during a command chain");
break;
default:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 8 - Reserved");
}
break;
case 0x90: /* Format 9 - Device Read, Write, and Seek Checks */
switch (msg_no) {
case 0x00:
break; /* No Message */
case 0x06:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 9 - Device check-2 error");
break;
case 0x07:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 9 - Head address did not compare");
break;
case 0x0A:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 9 - Track physical address did "
"not compare while oriented");
break;
case 0x0E:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 9 - Cylinder address did not "
"compare");
break;
default:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT 9 - Reserved");
}
break;
case 0xF0: /* Format F - Cache Storage Checks */
switch (msg_no) {
case 0x00:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT F - Operation Terminated");
break;
case 0x01:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT F - Subsystem Processing Error");
break;
case 0x02:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT F - Cache or nonvolatile storage "
"equipment failure");
break;
case 0x04:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT F - Caching terminated");
break;
case 0x06:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT F - Cache fast write access not "
"authorized");
break;
case 0x07:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT F - Track format incorrect");
break;
case 0x09:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT F - Caching reinitiated");
break;
case 0x0A:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT F - Nonvolatile storage "
"terminated");
break;
case 0x0B:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT F - Volume is suspended duplex");
/* call extended error reporting (EER) */
dasd_eer_write(device, erp->refers,
DASD_EER_PPRCSUSPEND);
break;
case 0x0C:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT F - Subsystem status connot be "
"determined");
break;
case 0x0D:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT F - Caching status reset to "
"default");
break;
case 0x0E:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT F - DASD Fast Write inhibited");
break;
default:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT D - Reserved");
}
break;
default: /* unknown message format - should not happen */
DEV_MESSAGE (KERN_WARNING, device,
"unknown message format %02x",
msg_format);
break;
} /* end switch message format */
} /* end dasd_3990_handle_env_data */
/*
* DASD_3990_ERP_COM_REJ
*
* DESCRIPTION
* Handles 24 byte 'Command Reject' error.
*
* PARAMETER
* erp current erp_head
* sense current sense data
*
* RETURN VALUES
* erp 'new' erp_head - pointer to new ERP
*/
static struct dasd_ccw_req *
dasd_3990_erp_com_rej(struct dasd_ccw_req * erp, char *sense)
{
struct dasd_device *device = erp->startdev;
erp->function = dasd_3990_erp_com_rej;
/* env data present (ACTION 10 - retry should work) */
if (sense[2] & SNS2_ENV_DATA_PRESENT) {
DEV_MESSAGE(KERN_DEBUG, device, "%s",
"Command Reject - environmental data present");
dasd_3990_handle_env_data(erp, sense);
erp->retries = 5;
} else {
/* fatal error - set status to FAILED */
DEV_MESSAGE(KERN_ERR, device, "%s",
"Command Reject - Fatal error");
erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
}
return erp;
} /* end dasd_3990_erp_com_rej */
/*
* DASD_3990_ERP_BUS_OUT
*
* DESCRIPTION
* Handles 24 byte 'Bus Out Parity Check' error.
*
* PARAMETER
* erp current erp_head
* RETURN VALUES
* erp new erp_head - pointer to new ERP
*/
static struct dasd_ccw_req *
dasd_3990_erp_bus_out(struct dasd_ccw_req * erp)
{
struct dasd_device *device = erp->startdev;
/* first time set initial retry counter and erp_function */
/* and retry once without blocking queue */
/* (this enables easier enqueing of the cqr) */
if (erp->function != dasd_3990_erp_bus_out) {
erp->retries = 256;
erp->function = dasd_3990_erp_bus_out;
} else {
/* issue a message and wait for 'device ready' interrupt */
DEV_MESSAGE(KERN_DEBUG, device, "%s",
"bus out parity error or BOPC requested by "
"channel");
dasd_3990_erp_block_queue(erp, 60*HZ);
}
return erp;
} /* end dasd_3990_erp_bus_out */
/*
* DASD_3990_ERP_EQUIP_CHECK
*
* DESCRIPTION
* Handles 24 byte 'Equipment Check' error.
*
* PARAMETER
* erp current erp_head
* RETURN VALUES
* erp new erp_head - pointer to new ERP
*/
static struct dasd_ccw_req *
dasd_3990_erp_equip_check(struct dasd_ccw_req * erp, char *sense)
{
struct dasd_device *device = erp->startdev;
erp->function = dasd_3990_erp_equip_check;
if (sense[1] & SNS1_WRITE_INHIBITED) {
DEV_MESSAGE(KERN_DEBUG, device, "%s",
"Write inhibited path encountered");
/* vary path offline */
DEV_MESSAGE(KERN_ERR, device, "%s",
"Path should be varied off-line. "
"This is not implemented yet \n - please report "
"to linux390@de.ibm.com");
erp = dasd_3990_erp_action_1(erp);
} else if (sense[2] & SNS2_ENV_DATA_PRESENT) {
DEV_MESSAGE(KERN_DEBUG, device, "%s",
"Equipment Check - " "environmental data present");
dasd_3990_handle_env_data(erp, sense);
erp = dasd_3990_erp_action_4(erp, sense);
} else if (sense[1] & SNS1_PERM_ERR) {
DEV_MESSAGE(KERN_DEBUG, device, "%s",
"Equipment Check - retry exhausted or "
"undesirable");
erp = dasd_3990_erp_action_1(erp);
} else {
/* all other equipment checks - Action 5 */
/* rest is done when retries == 0 */
DEV_MESSAGE(KERN_DEBUG, device, "%s",
"Equipment check or processing error");
erp = dasd_3990_erp_action_5(erp);
}
return erp;
} /* end dasd_3990_erp_equip_check */
/*
* DASD_3990_ERP_DATA_CHECK
*
* DESCRIPTION
* Handles 24 byte 'Data Check' error.
*
* PARAMETER
* erp current erp_head
* RETURN VALUES
* erp new erp_head - pointer to new ERP
*/
static struct dasd_ccw_req *
dasd_3990_erp_data_check(struct dasd_ccw_req * erp, char *sense)
{
struct dasd_device *device = erp->startdev;
erp->function = dasd_3990_erp_data_check;
if (sense[2] & SNS2_CORRECTABLE) { /* correctable data check */
/* issue message that the data has been corrected */
DEV_MESSAGE(KERN_EMERG, device, "%s",
"Data recovered during retry with PCI "
"fetch mode active");
/* not possible to handle this situation in Linux */
panic("No way to inform application about the possibly "
"incorrect data");
} else if (sense[2] & SNS2_ENV_DATA_PRESENT) {
DEV_MESSAGE(KERN_DEBUG, device, "%s",
"Uncorrectable data check recovered secondary "
"addr of duplex pair");
erp = dasd_3990_erp_action_4(erp, sense);
} else if (sense[1] & SNS1_PERM_ERR) {
DEV_MESSAGE(KERN_DEBUG, device, "%s",
"Uncorrectable data check with internal "
"retry exhausted");
erp = dasd_3990_erp_action_1(erp);
} else {
/* all other data checks */
DEV_MESSAGE(KERN_DEBUG, device, "%s",
"Uncorrectable data check with retry count "
"exhausted...");
erp = dasd_3990_erp_action_5(erp);
}
return erp;
} /* end dasd_3990_erp_data_check */
/*
* DASD_3990_ERP_OVERRUN
*
* DESCRIPTION
* Handles 24 byte 'Overrun' error.
*
* PARAMETER
* erp current erp_head
* RETURN VALUES
* erp new erp_head - pointer to new ERP
*/
static struct dasd_ccw_req *
dasd_3990_erp_overrun(struct dasd_ccw_req * erp, char *sense)
{
struct dasd_device *device = erp->startdev;
erp->function = dasd_3990_erp_overrun;
DEV_MESSAGE(KERN_DEBUG, device, "%s",
"Overrun - service overrun or overrun"
" error requested by channel");
erp = dasd_3990_erp_action_5(erp);
return erp;
} /* end dasd_3990_erp_overrun */
/*
* DASD_3990_ERP_INV_FORMAT
*
* DESCRIPTION
* Handles 24 byte 'Invalid Track Format' error.
*
* PARAMETER
* erp current erp_head
* RETURN VALUES
* erp new erp_head - pointer to new ERP
*/
static struct dasd_ccw_req *
dasd_3990_erp_inv_format(struct dasd_ccw_req * erp, char *sense)
{
struct dasd_device *device = erp->startdev;
erp->function = dasd_3990_erp_inv_format;
if (sense[2] & SNS2_ENV_DATA_PRESENT) {
DEV_MESSAGE(KERN_DEBUG, device, "%s",
"Track format error when destaging or "
"staging data");
dasd_3990_handle_env_data(erp, sense);
erp = dasd_3990_erp_action_4(erp, sense);
} else {
DEV_MESSAGE(KERN_ERR, device, "%s",
"Invalid Track Format - Fatal error");
erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
}
return erp;
} /* end dasd_3990_erp_inv_format */
/*
* DASD_3990_ERP_EOC
*
* DESCRIPTION
* Handles 24 byte 'End-of-Cylinder' error.
*
* PARAMETER
* erp already added default erp
* RETURN VALUES
* erp pointer to original (failed) cqr.
*/
static struct dasd_ccw_req *
dasd_3990_erp_EOC(struct dasd_ccw_req * default_erp, char *sense)
{
struct dasd_device *device = default_erp->startdev;
DEV_MESSAGE(KERN_ERR, device, "%s",
"End-of-Cylinder - must never happen");
/* implement action 7 - BUG */
return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED);
} /* end dasd_3990_erp_EOC */
/*
* DASD_3990_ERP_ENV_DATA
*
* DESCRIPTION
* Handles 24 byte 'Environmental-Data Present' error.
*
* PARAMETER
* erp current erp_head
* RETURN VALUES
* erp new erp_head - pointer to new ERP
*/
static struct dasd_ccw_req *
dasd_3990_erp_env_data(struct dasd_ccw_req * erp, char *sense)
{
struct dasd_device *device = erp->startdev;
erp->function = dasd_3990_erp_env_data;
DEV_MESSAGE(KERN_DEBUG, device, "%s", "Environmental data present");
dasd_3990_handle_env_data(erp, sense);
/* don't retry on disabled interface */
if (sense[7] != 0x0F) {
erp = dasd_3990_erp_action_4(erp, sense);
} else {
erp->status = DASD_CQR_FILLED;
}
return erp;
} /* end dasd_3990_erp_env_data */
/*
* DASD_3990_ERP_NO_REC
*
* DESCRIPTION
* Handles 24 byte 'No Record Found' error.
*
* PARAMETER
* erp already added default ERP
*
* RETURN VALUES
* erp new erp_head - pointer to new ERP
*/
static struct dasd_ccw_req *
dasd_3990_erp_no_rec(struct dasd_ccw_req * default_erp, char *sense)
{
struct dasd_device *device = default_erp->startdev;
DEV_MESSAGE(KERN_ERR, device, "%s",
"No Record Found - Fatal error ");
return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED);
} /* end dasd_3990_erp_no_rec */
/*
* DASD_3990_ERP_FILE_PROT
*
* DESCRIPTION
* Handles 24 byte 'File Protected' error.
* Note: Seek related recovery is not implemented because
* wee don't use the seek command yet.
*
* PARAMETER
* erp current erp_head
* RETURN VALUES
* erp new erp_head - pointer to new ERP
*/
static struct dasd_ccw_req *
dasd_3990_erp_file_prot(struct dasd_ccw_req * erp)
{
struct dasd_device *device = erp->startdev;
DEV_MESSAGE(KERN_ERR, device, "%s", "File Protected");
return dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
} /* end dasd_3990_erp_file_prot */
/*
* DASD_3990_ERP_INSPECT_ALIAS
*
* DESCRIPTION
* Checks if the original request was started on an alias device.
* If yes, it modifies the original and the erp request so that
* the erp request can be started on a base device.
*
* PARAMETER
* erp pointer to the currently created default ERP
*
* RETURN VALUES
* erp pointer to the modified ERP, or NULL
*/
static struct dasd_ccw_req *dasd_3990_erp_inspect_alias(
struct dasd_ccw_req *erp)
{
struct dasd_ccw_req *cqr = erp->refers;
if (cqr->block &&
(cqr->block->base != cqr->startdev)) {
if (cqr->startdev->features & DASD_FEATURE_ERPLOG) {
DEV_MESSAGE(KERN_ERR, cqr->startdev,
"ERP on alias device for request %p,"
" recover on base device %s", cqr,
cqr->block->base->cdev->dev.bus_id);
}
dasd_eckd_reset_ccw_to_base_io(cqr);
erp->startdev = cqr->block->base;
erp->function = dasd_3990_erp_inspect_alias;
return erp;
} else
return NULL;
}
/*
* DASD_3990_ERP_INSPECT_24
*
* DESCRIPTION
* Does a detailed inspection of the 24 byte sense data
* and sets up a related error recovery action.
*
* PARAMETER
* sense sense data of the actual error
* erp pointer to the currently created default ERP
*
* RETURN VALUES
* erp pointer to the (addtitional) ERP
*/
static struct dasd_ccw_req *
dasd_3990_erp_inspect_24(struct dasd_ccw_req * erp, char *sense)
{
struct dasd_ccw_req *erp_filled = NULL;
/* Check sense for .... */
/* 'Command Reject' */
if ((erp_filled == NULL) && (sense[0] & SNS0_CMD_REJECT)) {
erp_filled = dasd_3990_erp_com_rej(erp, sense);
}
/* 'Intervention Required' */
if ((erp_filled == NULL) && (sense[0] & SNS0_INTERVENTION_REQ)) {
erp_filled = dasd_3990_erp_int_req(erp);
}
/* 'Bus Out Parity Check' */
if ((erp_filled == NULL) && (sense[0] & SNS0_BUS_OUT_CHECK)) {
erp_filled = dasd_3990_erp_bus_out(erp);
}
/* 'Equipment Check' */
if ((erp_filled == NULL) && (sense[0] & SNS0_EQUIPMENT_CHECK)) {
erp_filled = dasd_3990_erp_equip_check(erp, sense);
}
/* 'Data Check' */
if ((erp_filled == NULL) && (sense[0] & SNS0_DATA_CHECK)) {
erp_filled = dasd_3990_erp_data_check(erp, sense);
}
/* 'Overrun' */
if ((erp_filled == NULL) && (sense[0] & SNS0_OVERRUN)) {
erp_filled = dasd_3990_erp_overrun(erp, sense);
}
/* 'Invalid Track Format' */
if ((erp_filled == NULL) && (sense[1] & SNS1_INV_TRACK_FORMAT)) {
erp_filled = dasd_3990_erp_inv_format(erp, sense);
}
/* 'End-of-Cylinder' */
if ((erp_filled == NULL) && (sense[1] & SNS1_EOC)) {
erp_filled = dasd_3990_erp_EOC(erp, sense);
}
/* 'Environmental Data' */
if ((erp_filled == NULL) && (sense[2] & SNS2_ENV_DATA_PRESENT)) {
erp_filled = dasd_3990_erp_env_data(erp, sense);
}
/* 'No Record Found' */
if ((erp_filled == NULL) && (sense[1] & SNS1_NO_REC_FOUND)) {
erp_filled = dasd_3990_erp_no_rec(erp, sense);
}
/* 'File Protected' */
if ((erp_filled == NULL) && (sense[1] & SNS1_FILE_PROTECTED)) {
erp_filled = dasd_3990_erp_file_prot(erp);
}
/* other (unknown) error - do default ERP */
if (erp_filled == NULL) {
erp_filled = erp;
}
return erp_filled;
} /* END dasd_3990_erp_inspect_24 */
/*
*****************************************************************************
* 32 byte sense ERP functions (only)
*****************************************************************************
*/
/*
* DASD_3990_ERPACTION_10_32
*
* DESCRIPTION
* Handles 32 byte 'Action 10' of Single Program Action Codes.
* Just retry and if retry doesn't work, return with error.
*
* PARAMETER
* erp current erp_head
* sense current sense data
* RETURN VALUES
* erp modified erp_head
*/
static struct dasd_ccw_req *
dasd_3990_erp_action_10_32(struct dasd_ccw_req * erp, char *sense)
{
struct dasd_device *device = erp->startdev;
erp->retries = 256;
erp->function = dasd_3990_erp_action_10_32;
DEV_MESSAGE(KERN_DEBUG, device, "%s", "Perform logging requested");
return erp;
} /* end dasd_3990_erp_action_10_32 */
/*
* DASD_3990_ERP_ACTION_1B_32
*
* DESCRIPTION
* Handles 32 byte 'Action 1B' of Single Program Action Codes.
* A write operation could not be finished because of an unexpected
* condition.
* The already created 'default erp' is used to get the link to
* the erp chain, but it can not be used for this recovery
* action because it contains no DE/LO data space.
*
* PARAMETER
* default_erp already added default erp.
* sense current sense data
*
* RETURN VALUES
* erp new erp or
* default_erp in case of imprecise ending or error
*/
static struct dasd_ccw_req *
dasd_3990_erp_action_1B_32(struct dasd_ccw_req * default_erp, char *sense)
{
struct dasd_device *device = default_erp->startdev;
__u32 cpa = 0;
struct dasd_ccw_req *cqr;
struct dasd_ccw_req *erp;
struct DE_eckd_data *DE_data;
struct PFX_eckd_data *PFX_data;
char *LO_data; /* LO_eckd_data_t */
struct ccw1 *ccw, *oldccw;
DEV_MESSAGE(KERN_DEBUG, device, "%s",
"Write not finished because of unexpected condition");
default_erp->function = dasd_3990_erp_action_1B_32;
/* determine the original cqr */
cqr = default_erp;
while (cqr->refers != NULL) {
cqr = cqr->refers;
}
/* for imprecise ending just do default erp */
if (sense[1] & 0x01) {
DEV_MESSAGE(KERN_DEBUG, device, "%s",
"Imprecise ending is set - just retry");
return default_erp;
}
/* determine the address of the CCW to be restarted */
/* Imprecise ending is not set -> addr from IRB-SCSW */
cpa = default_erp->refers->irb.scsw.cpa;
if (cpa == 0) {
DEV_MESSAGE(KERN_DEBUG, device, "%s",
"Unable to determine address of the CCW "
"to be restarted");
return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED);
}
/* Build new ERP request including DE/LO */
erp = dasd_alloc_erp_request((char *) &cqr->magic,
2 + 1,/* DE/LO + TIC */
sizeof(struct DE_eckd_data) +
sizeof(struct LO_eckd_data), device);
if (IS_ERR(erp)) {
DEV_MESSAGE(KERN_ERR, device, "%s", "Unable to allocate ERP");
return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED);
}
/* use original DE */
DE_data = erp->data;
oldccw = cqr->cpaddr;
if (oldccw->cmd_code == DASD_ECKD_CCW_PFX) {
PFX_data = cqr->data;
memcpy(DE_data, &PFX_data->define_extend,
sizeof(struct DE_eckd_data));
} else
memcpy(DE_data, cqr->data, sizeof(struct DE_eckd_data));
/* create LO */
LO_data = erp->data + sizeof(struct DE_eckd_data);
if ((sense[3] == 0x01) && (LO_data[1] & 0x01)) {
DEV_MESSAGE(KERN_ERR, device, "%s",
"BUG - this should not happen");
return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED);
}
if ((sense[7] & 0x3F) == 0x01) {
/* operation code is WRITE DATA -> data area orientation */
LO_data[0] = 0x81;
} else if ((sense[7] & 0x3F) == 0x03) {
/* operation code is FORMAT WRITE -> index orientation */
LO_data[0] = 0xC3;
} else {
LO_data[0] = sense[7]; /* operation */
}
LO_data[1] = sense[8]; /* auxiliary */
LO_data[2] = sense[9];
LO_data[3] = sense[3]; /* count */
LO_data[4] = sense[29]; /* seek_addr.cyl */
LO_data[5] = sense[30]; /* seek_addr.cyl 2nd byte */
LO_data[7] = sense[31]; /* seek_addr.head 2nd byte */
memcpy(&(LO_data[8]), &(sense[11]), 8);
/* create DE ccw */
ccw = erp->cpaddr;
memset(ccw, 0, sizeof(struct ccw1));
ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
ccw->flags = CCW_FLAG_CC;
ccw->count = 16;
ccw->cda = (__u32)(addr_t) DE_data;
/* create LO ccw */
ccw++;
memset(ccw, 0, sizeof(struct ccw1));
ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
ccw->flags = CCW_FLAG_CC;
ccw->count = 16;
ccw->cda = (__u32)(addr_t) LO_data;
/* TIC to the failed ccw */
ccw++;
ccw->cmd_code = CCW_CMD_TIC;
ccw->cda = cpa;
/* fill erp related fields */
erp->function = dasd_3990_erp_action_1B_32;
erp->refers = default_erp->refers;
erp->startdev = device;
erp->memdev = device;
erp->magic = default_erp->magic;
erp->expires = 0;
erp->retries = 256;
erp->buildclk = get_clock();
erp->status = DASD_CQR_FILLED;
/* remove the default erp */
dasd_free_erp_request(default_erp, device);
return erp;
} /* end dasd_3990_erp_action_1B_32 */
/*
* DASD_3990_UPDATE_1B
*
* DESCRIPTION
* Handles the update to the 32 byte 'Action 1B' of Single Program
* Action Codes in case the first action was not successful.
* The already created 'previous_erp' is the currently not successful
* ERP.
*
* PARAMETER
* previous_erp already created previous erp.
* sense current sense data
* RETURN VALUES
* erp modified erp
*/
static struct dasd_ccw_req *
dasd_3990_update_1B(struct dasd_ccw_req * previous_erp, char *sense)
{
struct dasd_device *device = previous_erp->startdev;
__u32 cpa = 0;
struct dasd_ccw_req *cqr;
struct dasd_ccw_req *erp;
char *LO_data; /* struct LO_eckd_data */
struct ccw1 *ccw;
DEV_MESSAGE(KERN_DEBUG, device, "%s",
"Write not finished because of unexpected condition"
" - follow on");
/* determine the original cqr */
cqr = previous_erp;
while (cqr->refers != NULL) {
cqr = cqr->refers;
}
/* for imprecise ending just do default erp */
if (sense[1] & 0x01) {
DEV_MESSAGE(KERN_DEBUG, device, "%s",
"Imprecise ending is set - just retry");
previous_erp->status = DASD_CQR_FILLED;
return previous_erp;
}
/* determine the address of the CCW to be restarted */
/* Imprecise ending is not set -> addr from IRB-SCSW */
cpa = previous_erp->irb.scsw.cpa;
if (cpa == 0) {
DEV_MESSAGE(KERN_DEBUG, device, "%s",
"Unable to determine address of the CCW "
"to be restarted");
previous_erp->status = DASD_CQR_FAILED;
return previous_erp;
}
erp = previous_erp;
/* update the LO with the new returned sense data */
LO_data = erp->data + sizeof(struct DE_eckd_data);
if ((sense[3] == 0x01) && (LO_data[1] & 0x01)) {
DEV_MESSAGE(KERN_ERR, device, "%s",
"BUG - this should not happen");
previous_erp->status = DASD_CQR_FAILED;
return previous_erp;
}
if ((sense[7] & 0x3F) == 0x01) {
/* operation code is WRITE DATA -> data area orientation */
LO_data[0] = 0x81;
} else if ((sense[7] & 0x3F) == 0x03) {
/* operation code is FORMAT WRITE -> index orientation */
LO_data[0] = 0xC3;
} else {
LO_data[0] = sense[7]; /* operation */
}
LO_data[1] = sense[8]; /* auxiliary */
LO_data[2] = sense[9];
LO_data[3] = sense[3]; /* count */
LO_data[4] = sense[29]; /* seek_addr.cyl */
LO_data[5] = sense[30]; /* seek_addr.cyl 2nd byte */
LO_data[7] = sense[31]; /* seek_addr.head 2nd byte */
memcpy(&(LO_data[8]), &(sense[11]), 8);
/* TIC to the failed ccw */
ccw = erp->cpaddr; /* addr of DE ccw */
ccw++; /* addr of LE ccw */
ccw++; /* addr of TIC ccw */
ccw->cda = cpa;
erp->status = DASD_CQR_FILLED;
return erp;
} /* end dasd_3990_update_1B */
/*
* DASD_3990_ERP_COMPOUND_RETRY
*
* DESCRIPTION
* Handles the compound ERP action retry code.
* NOTE: At least one retry is done even if zero is specified
* by the sense data. This makes enqueueing of the request
* easier.
*
* PARAMETER
* sense sense data of the actual error
* erp pointer to the currently created ERP
*
* RETURN VALUES
* erp modified ERP pointer
*
*/
static void
dasd_3990_erp_compound_retry(struct dasd_ccw_req * erp, char *sense)
{
switch (sense[25] & 0x03) {
case 0x00: /* no not retry */
erp->retries = 1;
break;
case 0x01: /* retry 2 times */
erp->retries = 2;
break;
case 0x02: /* retry 10 times */
erp->retries = 10;
break;
case 0x03: /* retry 256 times */
erp->retries = 256;
break;
default:
BUG();
}
erp->function = dasd_3990_erp_compound_retry;
} /* end dasd_3990_erp_compound_retry */
/*
* DASD_3990_ERP_COMPOUND_PATH
*
* DESCRIPTION
* Handles the compound ERP action for retry on alternate
* channel path.
*
* PARAMETER
* sense sense data of the actual error
* erp pointer to the currently created ERP
*
* RETURN VALUES
* erp modified ERP pointer
*
*/
static void
dasd_3990_erp_compound_path(struct dasd_ccw_req * erp, char *sense)
{
if (sense[25] & DASD_SENSE_BIT_3) {
dasd_3990_erp_alternate_path(erp);
if (erp->status == DASD_CQR_FAILED) {
/* reset the lpm and the status to be able to
* try further actions. */
erp->lpm = 0;
erp->status = DASD_CQR_NEED_ERP;
}
}
erp->function = dasd_3990_erp_compound_path;
} /* end dasd_3990_erp_compound_path */
/*
* DASD_3990_ERP_COMPOUND_CODE
*
* DESCRIPTION
* Handles the compound ERP action for retry code.
*
* PARAMETER
* sense sense data of the actual error
* erp pointer to the currently created ERP
*
* RETURN VALUES
* erp NEW ERP pointer
*
*/
static struct dasd_ccw_req *
dasd_3990_erp_compound_code(struct dasd_ccw_req * erp, char *sense)
{
if (sense[25] & DASD_SENSE_BIT_2) {
switch (sense[28]) {
case 0x17:
/* issue a Diagnostic Control command with an
* Inhibit Write subcommand and controller modifier */
erp = dasd_3990_erp_DCTL(erp, 0x20);
break;
case 0x25:
/* wait for 5 seconds and retry again */
erp->retries = 1;
dasd_3990_erp_block_queue (erp, 5*HZ);
break;
default:
/* should not happen - continue */
break;
}
}
erp->function = dasd_3990_erp_compound_code;
return erp;
} /* end dasd_3990_erp_compound_code */
/*
* DASD_3990_ERP_COMPOUND_CONFIG
*
* DESCRIPTION
* Handles the compound ERP action for configruation
* dependent error.
* Note: duplex handling is not implemented (yet).
*
* PARAMETER
* sense sense data of the actual error
* erp pointer to the currently created ERP
*
* RETURN VALUES
* erp modified ERP pointer
*
*/
static void
dasd_3990_erp_compound_config(struct dasd_ccw_req * erp, char *sense)
{
if ((sense[25] & DASD_SENSE_BIT_1) && (sense[26] & DASD_SENSE_BIT_2)) {
/* set to suspended duplex state then restart */
struct dasd_device *device = erp->startdev;
DEV_MESSAGE(KERN_ERR, device, "%s",
"Set device to suspended duplex state should be "
"done!\n"
"This is not implemented yet (for compound ERP)"
" - please report to linux390@de.ibm.com");
}
erp->function = dasd_3990_erp_compound_config;
} /* end dasd_3990_erp_compound_config */
/*
* DASD_3990_ERP_COMPOUND
*
* DESCRIPTION
* Does the further compound program action if
* compound retry was not successful.
*
* PARAMETER
* sense sense data of the actual error
* erp pointer to the current (failed) ERP
*
* RETURN VALUES
* erp (additional) ERP pointer
*
*/
static struct dasd_ccw_req *
dasd_3990_erp_compound(struct dasd_ccw_req * erp, char *sense)
{
if ((erp->function == dasd_3990_erp_compound_retry) &&
(erp->status == DASD_CQR_NEED_ERP)) {
dasd_3990_erp_compound_path(erp, sense);
}
if ((erp->function == dasd_3990_erp_compound_path) &&
(erp->status == DASD_CQR_NEED_ERP)) {
erp = dasd_3990_erp_compound_code(erp, sense);
}
if ((erp->function == dasd_3990_erp_compound_code) &&
(erp->status == DASD_CQR_NEED_ERP)) {
dasd_3990_erp_compound_config(erp, sense);
}
/* if no compound action ERP specified, the request failed */
if (erp->status == DASD_CQR_NEED_ERP)
erp->status = DASD_CQR_FAILED;
return erp;
} /* end dasd_3990_erp_compound */
/*
* DASD_3990_ERP_INSPECT_32
*
* DESCRIPTION
* Does a detailed inspection of the 32 byte sense data
* and sets up a related error recovery action.
*
* PARAMETER
* sense sense data of the actual error
* erp pointer to the currently created default ERP
*
* RETURN VALUES
* erp_filled pointer to the ERP
*
*/
static struct dasd_ccw_req *
dasd_3990_erp_inspect_32(struct dasd_ccw_req * erp, char *sense)
{
struct dasd_device *device = erp->startdev;
erp->function = dasd_3990_erp_inspect_32;
if (sense[25] & DASD_SENSE_BIT_0) {
/* compound program action codes (byte25 bit 0 == '1') */
dasd_3990_erp_compound_retry(erp, sense);
} else {
/* single program action codes (byte25 bit 0 == '0') */
switch (sense[25]) {
case 0x00: /* success - use default ERP for retries */
DEV_MESSAGE(KERN_DEBUG, device, "%s",
"ERP called for successful request"
" - just retry");
break;
case 0x01: /* fatal error */
DEV_MESSAGE(KERN_ERR, device, "%s",
"Retry not recommended - Fatal error");
erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
break;
case 0x02: /* intervention required */
case 0x03: /* intervention required during dual copy */
erp = dasd_3990_erp_int_req(erp);
break;
case 0x0F: /* length mismatch during update write command */
DEV_MESSAGE(KERN_ERR, device, "%s",
"update write command error - should not "
"happen;\n"
"Please send this message together with "
"the above sense data to linux390@de."
"ibm.com");
erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
break;
case 0x10: /* logging required for other channel program */
erp = dasd_3990_erp_action_10_32(erp, sense);
break;
case 0x15: /* next track outside defined extend */
DEV_MESSAGE(KERN_ERR, device, "%s",
"next track outside defined extend - "
"should not happen;\n"
"Please send this message together with "
"the above sense data to linux390@de."
"ibm.com");
erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
break;
case 0x1B: /* unexpected condition during write */
erp = dasd_3990_erp_action_1B_32(erp, sense);
break;
case 0x1C: /* invalid data */
DEV_MESSAGE(KERN_EMERG, device, "%s",
"Data recovered during retry with PCI "
"fetch mode active");
/* not possible to handle this situation in Linux */
panic
("Invalid data - No way to inform application "
"about the possibly incorrect data");
break;
case 0x1D: /* state-change pending */
DEV_MESSAGE(KERN_DEBUG, device, "%s",
"A State change pending condition exists "
"for the subsystem or device");
erp = dasd_3990_erp_action_4(erp, sense);
break;
case 0x1E: /* busy */
DEV_MESSAGE(KERN_DEBUG, device, "%s",
"Busy condition exists "
"for the subsystem or device");
erp = dasd_3990_erp_action_4(erp, sense);
break;
default: /* all others errors - default erp */
break;
}
}
return erp;
} /* end dasd_3990_erp_inspect_32 */
/*
*****************************************************************************
* main ERP control fuctions (24 and 32 byte sense)
*****************************************************************************
*/
/*
* DASD_3990_ERP_CONTROL_CHECK
*
* DESCRIPTION
* Does a generic inspection if a control check occured and sets up
* the related error recovery procedure
*
* PARAMETER
* erp pointer to the currently created default ERP
*
* RETURN VALUES
* erp_filled pointer to the erp
*/
static struct dasd_ccw_req *
dasd_3990_erp_control_check(struct dasd_ccw_req *erp)
{
struct dasd_device *device = erp->startdev;
if (erp->refers->irb.scsw.cstat & (SCHN_STAT_INTF_CTRL_CHK
| SCHN_STAT_CHN_CTRL_CHK)) {
DEV_MESSAGE(KERN_DEBUG, device, "%s",
"channel or interface control check");
erp = dasd_3990_erp_action_4(erp, NULL);
}
return erp;
}
/*
* DASD_3990_ERP_INSPECT
*
* DESCRIPTION
* Does a detailed inspection for sense data by calling either
* the 24-byte or the 32-byte inspection routine.
*
* PARAMETER
* erp pointer to the currently created default ERP
* RETURN VALUES
* erp_new contens was possibly modified
*/
static struct dasd_ccw_req *
dasd_3990_erp_inspect(struct dasd_ccw_req * erp)
{
struct dasd_ccw_req *erp_new = NULL;
/* sense data are located in the refers record of the */
/* already set up new ERP ! */
char *sense = erp->refers->irb.ecw;
/* if this problem occured on an alias retry on base */
erp_new = dasd_3990_erp_inspect_alias(erp);
if (erp_new)
return erp_new;
/* check if no concurrent sens is available */
if (!erp->refers->irb.esw.esw0.erw.cons)
erp_new = dasd_3990_erp_control_check(erp);
/* distinguish between 24 and 32 byte sense data */
else if (sense[27] & DASD_SENSE_BIT_0) {
/* inspect the 24 byte sense data */
erp_new = dasd_3990_erp_inspect_24(erp, sense);
} else {
/* inspect the 32 byte sense data */
erp_new = dasd_3990_erp_inspect_32(erp, sense);
} /* end distinguish between 24 and 32 byte sense data */
return erp_new;
}
/*
* DASD_3990_ERP_ADD_ERP
*
* DESCRIPTION
* This funtion adds an additional request block (ERP) to the head of
* the given cqr (or erp).
* This erp is initialized as an default erp (retry TIC)
*
* PARAMETER
* cqr head of the current ERP-chain (or single cqr if
* first error)
* RETURN VALUES
* erp pointer to new ERP-chain head
*/
static struct dasd_ccw_req *
dasd_3990_erp_add_erp(struct dasd_ccw_req * cqr)
{
struct dasd_device *device = cqr->startdev;
struct ccw1 *ccw;
/* allocate additional request block */
struct dasd_ccw_req *erp;
erp = dasd_alloc_erp_request((char *) &cqr->magic, 2, 0, device);
if (IS_ERR(erp)) {
if (cqr->retries <= 0) {
DEV_MESSAGE(KERN_ERR, device, "%s",
"Unable to allocate ERP request");
cqr->status = DASD_CQR_FAILED;
cqr->stopclk = get_clock ();
} else {
DEV_MESSAGE (KERN_ERR, device,
"Unable to allocate ERP request "
"(%i retries left)",
cqr->retries);
dasd_block_set_timer(device->block, (HZ << 3));
}
return cqr;
}
/* initialize request with default TIC to current ERP/CQR */
ccw = erp->cpaddr;
ccw->cmd_code = CCW_CMD_NOOP;
ccw->flags = CCW_FLAG_CC;
ccw++;
ccw->cmd_code = CCW_CMD_TIC;
ccw->cda = (long)(cqr->cpaddr);
erp->function = dasd_3990_erp_add_erp;
erp->refers = cqr;
erp->startdev = device;
erp->memdev = device;
erp->block = cqr->block;
erp->magic = cqr->magic;
erp->expires = 0;
erp->retries = 256;
erp->buildclk = get_clock();
erp->status = DASD_CQR_FILLED;
return erp;
}
/*
* DASD_3990_ERP_ADDITIONAL_ERP
*
* DESCRIPTION
* An additional ERP is needed to handle the current error.
* Add ERP to the head of the ERP-chain containing the ERP processing
* determined based on the sense data.
*
* PARAMETER
* cqr head of the current ERP-chain (or single cqr if
* first error)
*
* RETURN VALUES
* erp pointer to new ERP-chain head
*/
static struct dasd_ccw_req *
dasd_3990_erp_additional_erp(struct dasd_ccw_req * cqr)
{
struct dasd_ccw_req *erp = NULL;
/* add erp and initialize with default TIC */
erp = dasd_3990_erp_add_erp(cqr);
/* inspect sense, determine specific ERP if possible */
if (erp != cqr) {
erp = dasd_3990_erp_inspect(erp);
}
return erp;
} /* end dasd_3990_erp_additional_erp */
/*
* DASD_3990_ERP_ERROR_MATCH
*
* DESCRIPTION
* Check if the device status of the given cqr is the same.
* This means that the failed CCW and the relevant sense data
* must match.
* I don't distinguish between 24 and 32 byte sense because in case of
* 24 byte sense byte 25 and 27 is set as well.
*
* PARAMETER
* cqr1 first cqr, which will be compared with the
* cqr2 second cqr.
*
* RETURN VALUES
* match 'boolean' for match found
* returns 1 if match found, otherwise 0.
*/
static int
dasd_3990_erp_error_match(struct dasd_ccw_req *cqr1, struct dasd_ccw_req *cqr2)
{
/* check failed CCW */
if (cqr1->irb.scsw.cpa != cqr2->irb.scsw.cpa) {
// return 0; /* CCW doesn't match */
}
if (cqr1->irb.esw.esw0.erw.cons != cqr2->irb.esw.esw0.erw.cons)
return 0;
if ((cqr1->irb.esw.esw0.erw.cons == 0) &&
(cqr2->irb.esw.esw0.erw.cons == 0)) {
if ((cqr1->irb.scsw.cstat & (SCHN_STAT_INTF_CTRL_CHK |
SCHN_STAT_CHN_CTRL_CHK)) ==
(cqr2->irb.scsw.cstat & (SCHN_STAT_INTF_CTRL_CHK |
SCHN_STAT_CHN_CTRL_CHK)))
return 1; /* match with ifcc*/
}
/* check sense data; byte 0-2,25,27 */
if (!((memcmp (cqr1->irb.ecw, cqr2->irb.ecw, 3) == 0) &&
(cqr1->irb.ecw[27] == cqr2->irb.ecw[27]) &&
(cqr1->irb.ecw[25] == cqr2->irb.ecw[25]))) {
return 0; /* sense doesn't match */
}
return 1; /* match */
} /* end dasd_3990_erp_error_match */
/*
* DASD_3990_ERP_IN_ERP
*
* DESCRIPTION
* check if the current error already happened before.
* quick exit if current cqr is not an ERP (cqr->refers=NULL)
*
* PARAMETER
* cqr failed cqr (either original cqr or already an erp)
*
* RETURN VALUES
* erp erp-pointer to the already defined error
* recovery procedure OR
* NULL if a 'new' error occurred.
*/
static struct dasd_ccw_req *
dasd_3990_erp_in_erp(struct dasd_ccw_req *cqr)
{
struct dasd_ccw_req *erp_head = cqr, /* save erp chain head */
*erp_match = NULL; /* save erp chain head */
int match = 0; /* 'boolean' for matching error found */
if (cqr->refers == NULL) { /* return if not in erp */
return NULL;
}
/* check the erp/cqr chain for current error */
do {
match = dasd_3990_erp_error_match(erp_head, cqr->refers);
erp_match = cqr; /* save possible matching erp */
cqr = cqr->refers; /* check next erp/cqr in queue */
} while ((cqr->refers != NULL) && (!match));
if (!match) {
return NULL; /* no match was found */
}
return erp_match; /* return address of matching erp */
} /* END dasd_3990_erp_in_erp */
/*
* DASD_3990_ERP_FURTHER_ERP (24 & 32 byte sense)
*
* DESCRIPTION
* No retry is left for the current ERP. Check what has to be done
* with the ERP.
* - do further defined ERP action or
* - wait for interrupt or
* - exit with permanent error
*
* PARAMETER
* erp ERP which is in progress with no retry left
*
* RETURN VALUES
* erp modified/additional ERP
*/
static struct dasd_ccw_req *
dasd_3990_erp_further_erp(struct dasd_ccw_req *erp)
{
struct dasd_device *device = erp->startdev;
char *sense = erp->irb.ecw;
/* check for 24 byte sense ERP */
if ((erp->function == dasd_3990_erp_bus_out) ||
(erp->function == dasd_3990_erp_action_1) ||
(erp->function == dasd_3990_erp_action_4)) {
erp = dasd_3990_erp_action_1(erp);
} else if (erp->function == dasd_3990_erp_action_5) {
/* retries have not been successful */
/* prepare erp for retry on different channel path */
erp = dasd_3990_erp_action_1(erp);
if (!(sense[2] & DASD_SENSE_BIT_0)) {
/* issue a Diagnostic Control command with an
* Inhibit Write subcommand */
switch (sense[25]) {
case 0x17:
case 0x57:{ /* controller */
erp = dasd_3990_erp_DCTL(erp, 0x20);
break;
}
case 0x18:
case 0x58:{ /* channel path */
erp = dasd_3990_erp_DCTL(erp, 0x40);
break;
}
case 0x19:
case 0x59:{ /* storage director */
erp = dasd_3990_erp_DCTL(erp, 0x80);
break;
}
default:
DEV_MESSAGE(KERN_DEBUG, device,
"invalid subcommand modifier 0x%x "
"for Diagnostic Control Command",
sense[25]);
}
}
/* check for 32 byte sense ERP */
} else if ((erp->function == dasd_3990_erp_compound_retry) ||
(erp->function == dasd_3990_erp_compound_path) ||
(erp->function == dasd_3990_erp_compound_code) ||
(erp->function == dasd_3990_erp_compound_config)) {
erp = dasd_3990_erp_compound(erp, sense);
} else {
/* No retry left and no additional special handling */
/*necessary */
DEV_MESSAGE(KERN_ERR, device,
"no retries left for erp %p - "
"set status to FAILED", erp);
erp->status = DASD_CQR_FAILED;
}
return erp;
} /* end dasd_3990_erp_further_erp */
/*
* DASD_3990_ERP_HANDLE_MATCH_ERP
*
* DESCRIPTION
* An error occurred again and an ERP has been detected which is already
* used to handle this error (e.g. retries).
* All prior ERP's are asumed to be successful and therefore removed
* from queue.
* If retry counter of matching erp is already 0, it is checked if further
* action is needed (besides retry) or if the ERP has failed.
*
* PARAMETER
* erp_head first ERP in ERP-chain
* erp ERP that handles the actual error.
* (matching erp)
*
* RETURN VALUES
* erp modified/additional ERP
*/
static struct dasd_ccw_req *
dasd_3990_erp_handle_match_erp(struct dasd_ccw_req *erp_head,
struct dasd_ccw_req *erp)
{
struct dasd_device *device = erp_head->startdev;
struct dasd_ccw_req *erp_done = erp_head; /* finished req */
struct dasd_ccw_req *erp_free = NULL; /* req to be freed */
/* loop over successful ERPs and remove them from chanq */
while (erp_done != erp) {
if (erp_done == NULL) /* end of chain reached */
panic(PRINTK_HEADER "Programming error in ERP! The "
"original request was lost\n");
/* remove the request from the device queue */
list_del(&erp_done->blocklist);
erp_free = erp_done;
erp_done = erp_done->refers;
/* free the finished erp request */
dasd_free_erp_request(erp_free, erp_free->memdev);
} /* end while */
if (erp->retries > 0) {
char *sense = erp->refers->irb.ecw;
/* check for special retries */
if (erp->function == dasd_3990_erp_action_4) {
erp = dasd_3990_erp_action_4(erp, sense);
} else if (erp->function == dasd_3990_erp_action_1B_32) {
erp = dasd_3990_update_1B(erp, sense);
} else if (erp->function == dasd_3990_erp_int_req) {
erp = dasd_3990_erp_int_req(erp);
} else {
/* simple retry */
DEV_MESSAGE(KERN_DEBUG, device,
"%i retries left for erp %p",
erp->retries, erp);
/* handle the request again... */
erp->status = DASD_CQR_FILLED;
}
} else {
/* no retry left - check for further necessary action */
/* if no further actions, handle rest as permanent error */
erp = dasd_3990_erp_further_erp(erp);
}
return erp;
} /* end dasd_3990_erp_handle_match_erp */
/*
* DASD_3990_ERP_ACTION
*
* DESCRIPTION
* control routine for 3990 erp actions.
* Has to be called with the queue lock (namely the s390_irq_lock) acquired.
*
* PARAMETER
* cqr failed cqr (either original cqr or already an erp)
*
* RETURN VALUES
* erp erp-pointer to the head of the ERP action chain.
* This means:
* - either a ptr to an additional ERP cqr or
* - the original given cqr (which's status might
* be modified)
*/
struct dasd_ccw_req *
dasd_3990_erp_action(struct dasd_ccw_req * cqr)
{
struct dasd_ccw_req *erp = NULL;
struct dasd_device *device = cqr->startdev;
struct dasd_ccw_req *temp_erp = NULL;
if (device->features & DASD_FEATURE_ERPLOG) {
/* print current erp_chain */
DEV_MESSAGE(KERN_ERR, device, "%s",
"ERP chain at BEGINNING of ERP-ACTION");
for (temp_erp = cqr;
temp_erp != NULL; temp_erp = temp_erp->refers) {
DEV_MESSAGE(KERN_ERR, device,
" erp %p (%02x) refers to %p",
temp_erp, temp_erp->status,
temp_erp->refers);
}
}
/* double-check if current erp/cqr was successfull */
if ((cqr->irb.scsw.cstat == 0x00) &&
(cqr->irb.scsw.dstat == (DEV_STAT_CHN_END|DEV_STAT_DEV_END))) {
DEV_MESSAGE(KERN_DEBUG, device,
"ERP called for successful request %p"
" - NO ERP necessary", cqr);
cqr->status = DASD_CQR_DONE;
return cqr;
}
/* check if error happened before */
erp = dasd_3990_erp_in_erp(cqr);
if (erp == NULL) {
/* no matching erp found - set up erp */
erp = dasd_3990_erp_additional_erp(cqr);
} else {
/* matching erp found - set all leading erp's to DONE */
erp = dasd_3990_erp_handle_match_erp(cqr, erp);
}
if (device->features & DASD_FEATURE_ERPLOG) {
/* print current erp_chain */
DEV_MESSAGE(KERN_ERR, device, "%s",
"ERP chain at END of ERP-ACTION");
for (temp_erp = erp;
temp_erp != NULL; temp_erp = temp_erp->refers) {
DEV_MESSAGE(KERN_ERR, device,
" erp %p (%02x) refers to %p",
temp_erp, temp_erp->status,
temp_erp->refers);
}
}
/* enqueue ERP request if it's a new one */
if (list_empty(&erp->blocklist)) {
cqr->status = DASD_CQR_IN_ERP;
/* add erp request before the cqr */
list_add_tail(&erp->blocklist, &cqr->blocklist);
}
return erp;
} /* end dasd_3990_erp_action */
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