dasd_3990_erp.c

linux-2.6.15.6

	/* '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->device;

	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->device;
	__u32 cpa = 0;
	struct dasd_ccw_req *cqr;
	struct dasd_ccw_req *erp;
	struct DE_eckd_data *DE_data;
	char *LO_data;		/* LO_eckd_data_t */
	struct ccw1 *ccw;

	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;
	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->device = 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->device;
	__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_QUEUED;

		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_QUEUED;

	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_ERROR;

		}
	}

	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 controler 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->device;

		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 [e-mail]");

	}

	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_ERROR)) {