dasd_3990_erp.c

linux-2.6.15.6

	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");
			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->device;

	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->device;

	/* 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->device;

	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 [e-mail]");

		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->device;

	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->device;

	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->device;

	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 should have "
			    "been handled within the interrupt handler");

		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->device;

	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->device;

	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 = dasd_3990_erp_cleanup(erp, DASD_CQR_IN_IO);
	}

	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->device;

	DEV_MESSAGE(KERN_ERR, device, "%s",
		    "No Record Found - Fatal error should "
		    "have been handled within the interrupt handler");

	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->device;

	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_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);
	}