ql4_isr.c

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/*
 * QLogic iSCSI HBA Driver
 * Copyright (c)  2003-2006 QLogic Corporation
 *
 * See LICENSE.qla4xxx for copyright and licensing details.
 */

#include "ql4_def.h"
#include "ql4_glbl.h"
#include "ql4_dbg.h"
#include "ql4_inline.h"

/**
 * qla2x00_process_completed_request() - Process a Fast Post response.
 * @ha: SCSI driver HA context
 * @index: SRB index
 **/
static void qla4xxx_process_completed_request(struct scsi_qla_host *ha,
					      uint32_t index)
{
	struct srb *srb;

	srb = qla4xxx_del_from_active_array(ha, index);
	if (srb) {
		/* Save ISP completion status */
		srb->cmd->result = DID_OK << 16;
		qla4xxx_srb_compl(ha, srb);
	} else {
		DEBUG2(printk("scsi%ld: Invalid ISP SCSI completion handle = "
			      "%d\n", ha->host_no, index));
		set_bit(DPC_RESET_HA, &ha->dpc_flags);
	}
}

/**
 * qla4xxx_status_entry - processes status IOCBs
 * @ha: Pointer to host adapter structure.
 * @sts_entry: Pointer to status entry structure.
 **/
static void qla4xxx_status_entry(struct scsi_qla_host *ha,
				 struct status_entry *sts_entry)
{
	uint8_t scsi_status;
	struct scsi_cmnd *cmd;
	struct srb *srb;
	struct ddb_entry *ddb_entry;
	uint32_t residual;
	uint16_t sensebytecnt;

	if (sts_entry->completionStatus == SCS_COMPLETE &&
	    sts_entry->scsiStatus == 0) {
		qla4xxx_process_completed_request(ha,
						  le32_to_cpu(sts_entry->
							      handle));
		return;
	}

	srb = qla4xxx_del_from_active_array(ha, le32_to_cpu(sts_entry->handle));
	if (!srb) {
		/* FIXMEdg: Don't we need to reset ISP in this case??? */
		DEBUG2(printk(KERN_WARNING "scsi%ld: %s: Status Entry invalid "
			      "handle 0x%x, sp=%p. This cmd may have already "
			      "been completed.\n", ha->host_no, __func__,
			      le32_to_cpu(sts_entry->handle), srb));
		return;
	}

	cmd = srb->cmd;
	if (cmd == NULL) {
		DEBUG2(printk("scsi%ld: %s: Command already returned back to "
			      "OS pkt->handle=%d srb=%p srb->state:%d\n",
			      ha->host_no, __func__, sts_entry->handle,
			      srb, srb->state));
		dev_warn(&ha->pdev->dev, "Command is NULL:"
			" already returned to OS (srb=%p)\n", srb);
		return;
	}

	ddb_entry = srb->ddb;
	if (ddb_entry == NULL) {
		cmd->result = DID_NO_CONNECT << 16;
		goto status_entry_exit;
	}

	residual = le32_to_cpu(sts_entry->residualByteCnt);

	/* Translate ISP error to a Linux SCSI error. */
	scsi_status = sts_entry->scsiStatus;
	switch (sts_entry->completionStatus) {
	case SCS_COMPLETE:
		if (scsi_status == 0) {
			cmd->result = DID_OK << 16;
			break;
		}

		if (sts_entry->iscsiFlags & ISCSI_FLAG_RESIDUAL_OVER) {
			cmd->result = DID_ERROR << 16;
			break;
		}

		if (sts_entry->iscsiFlags &ISCSI_FLAG_RESIDUAL_UNDER) {
			scsi_set_resid(cmd, residual);
			if (!scsi_status && ((scsi_bufflen(cmd) - residual) <
				cmd->underflow)) {

				cmd->result = DID_ERROR << 16;

				DEBUG2(printk("scsi%ld:%d:%d:%d: %s: "
					"Mid-layer Data underrun0, "
					"xferlen = 0x%x, "
					"residual = 0x%x\n", ha->host_no,
					cmd->device->channel,
					cmd->device->id,
					cmd->device->lun, __func__,
					scsi_bufflen(cmd), residual));
				break;
			}
		}

		cmd->result = DID_OK << 16 | scsi_status;

		if (scsi_status != SCSI_CHECK_CONDITION)
			break;

		/* Copy Sense Data into sense buffer. */
		memset(cmd->sense_buffer, 0, sizeof(cmd->sense_buffer));

		sensebytecnt = le16_to_cpu(sts_entry->senseDataByteCnt);
		if (sensebytecnt == 0)
			break;

		memcpy(cmd->sense_buffer, sts_entry->senseData,
		       min(sensebytecnt,
			   (uint16_t) sizeof(cmd->sense_buffer)));

		DEBUG2(printk("scsi%ld:%d:%d:%d: %s: sense key = %x, "
			      "ASC/ASCQ = %02x/%02x\n", ha->host_no,
			      cmd->device->channel, cmd->device->id,
			      cmd->device->lun, __func__,
			      sts_entry->senseData[2] & 0x0f,
			      sts_entry->senseData[12],
			      sts_entry->senseData[13]));

		srb->flags |= SRB_GOT_SENSE;
		break;

	case SCS_INCOMPLETE:
		/* Always set the status to DID_ERROR, since
		 * all conditions result in that status anyway */
		cmd->result = DID_ERROR << 16;
		break;

	case SCS_RESET_OCCURRED:
		DEBUG2(printk("scsi%ld:%d:%d:%d: %s: Device RESET occurred\n",
			      ha->host_no, cmd->device->channel,
			      cmd->device->id, cmd->device->lun, __func__));

		cmd->result = DID_RESET << 16;
		break;

	case SCS_ABORTED:
		DEBUG2(printk("scsi%ld:%d:%d:%d: %s: Abort occurred\n",
			      ha->host_no, cmd->device->channel,
			      cmd->device->id, cmd->device->lun, __func__));

		cmd->result = DID_RESET << 16;
		break;

	case SCS_TIMEOUT:
		DEBUG2(printk(KERN_INFO "scsi%ld:%d:%d:%d: Timeout\n",
			      ha->host_no, cmd->device->channel,
			      cmd->device->id, cmd->device->lun));

		cmd->result = DID_BUS_BUSY << 16;

		/*
		 * Mark device missing so that we won't continue to send
		 * I/O to this device.	We should get a ddb state change
		 * AEN soon.
		 */
		if (atomic_read(&ddb_entry->state) == DDB_STATE_ONLINE)
			qla4xxx_mark_device_missing(ha, ddb_entry);
		break;

	case SCS_DATA_UNDERRUN:
	case SCS_DATA_OVERRUN:
		if ((sts_entry->iscsiFlags & ISCSI_FLAG_RESIDUAL_OVER) ||
			(sts_entry->completionStatus == SCS_DATA_OVERRUN)) {
			DEBUG2(printk("scsi%ld:%d:%d:%d: %s: " "Data overrun, "
				      "residual = 0x%x\n", ha->host_no,
				      cmd->device->channel, cmd->device->id,
				      cmd->device->lun, __func__, residual));

			cmd->result = DID_ERROR << 16;
			break;
		}

		scsi_set_resid(cmd, residual);

		/*
		 * If there is scsi_status, it takes precedense over
		 * underflow condition.
		 */
		if (scsi_status != 0) {
			cmd->result = DID_OK << 16 | scsi_status;

			if (scsi_status != SCSI_CHECK_CONDITION)
				break;

			/* Copy Sense Data into sense buffer. */
			memset(cmd->sense_buffer, 0,
			       sizeof(cmd->sense_buffer));

			sensebytecnt =
				le16_to_cpu(sts_entry->senseDataByteCnt);
			if (sensebytecnt == 0)
				break;

			memcpy(cmd->sense_buffer, sts_entry->senseData,
			       min(sensebytecnt,
				   (uint16_t) sizeof(cmd->sense_buffer)));

			DEBUG2(printk("scsi%ld:%d:%d:%d: %s: sense key = %x, "
				      "ASC/ASCQ = %02x/%02x\n", ha->host_no,
				      cmd->device->channel, cmd->device->id,
				      cmd->device->lun, __func__,
				      sts_entry->senseData[2] & 0x0f,
				      sts_entry->senseData[12],
				      sts_entry->senseData[13]));
		} else {
			/*
			 * If RISC reports underrun and target does not
			 * report it then we must have a lost frame, so
			 * tell upper layer to retry it by reporting a
			 * bus busy.
			 */
			if ((sts_entry->iscsiFlags &
			     ISCSI_FLAG_RESIDUAL_UNDER) == 0) {
				cmd->result = DID_BUS_BUSY << 16;
			} else if ((scsi_bufflen(cmd) - residual) <
				   cmd->underflow) {
				/*
				 * Handle mid-layer underflow???
				 *
				 * For kernels less than 2.4, the driver must
				 * return an error if an underflow is detected.
				 * For kernels equal-to and above 2.4, the
				 * mid-layer will appearantly handle the
				 * underflow by detecting the residual count --
				 * unfortunately, we do not see where this is
				 * actually being done.	 In the interim, we
				 * will return DID_ERROR.
				 */
				DEBUG2(printk("scsi%ld:%d:%d:%d: %s: "
					"Mid-layer Data underrun1, "
					"xferlen = 0x%x, "
					"residual = 0x%x\n", ha->host_no,
					cmd->device->channel,
					cmd->device->id,
					cmd->device->lun, __func__,
					scsi_bufflen(cmd), residual));

				cmd->result = DID_ERROR << 16;
			} else {
				cmd->result = DID_OK << 16;
			}
		}
		break;

	case SCS_DEVICE_LOGGED_OUT:
	case SCS_DEVICE_UNAVAILABLE:
		/*
		 * Mark device missing so that we won't continue to
		 * send I/O to this device.  We should get a ddb
		 * state change AEN soon.
		 */
		if (atomic_read(&ddb_entry->state) == DDB_STATE_ONLINE)
			qla4xxx_mark_device_missing(ha, ddb_entry);

		cmd->result = DID_BUS_BUSY << 16;
		break;

	case SCS_QUEUE_FULL:
		/*
		 * SCSI Mid-Layer handles device queue full
		 */
		cmd->result = DID_OK << 16 | sts_entry->scsiStatus;
		DEBUG2(printk("scsi%ld:%d:%d: %s: QUEUE FULL detected "
			      "compl=%02x, scsi=%02x, state=%02x, iFlags=%02x,"
			      " iResp=%02x\n", ha->host_no, cmd->device->id,
			      cmd->device->lun, __func__,
			      sts_entry->completionStatus,
			      sts_entry->scsiStatus, sts_entry->state_flags,
			      sts_entry->iscsiFlags,
			      sts_entry->iscsiResponse));
		break;

	default:
		cmd->result = DID_ERROR << 16;
		break;
	}

status_entry_exit:

	/* complete the request */
	srb->cc_stat = sts_entry->completionStatus;
	qla4xxx_srb_compl(ha, srb);
}

/**
 * qla4xxx_process_response_queue - process response queue completions
 * @ha: Pointer to host adapter structure.
 *
 * This routine process response queue completions in interrupt context.
 * Hardware_lock locked upon entry
 **/
static void qla4xxx_process_response_queue(struct scsi_qla_host * ha)
{
	uint32_t count = 0;
	struct srb *srb = NULL;
	struct status_entry *sts_entry;

	/* Process all responses from response queue */
	while ((ha->response_in =
		(uint16_t)le32_to_cpu(ha->shadow_regs->rsp_q_in)) !=
	       ha->response_out) {
		sts_entry = (struct status_entry *) ha->response_ptr;
		count++;

		/* Advance pointers for next entry */
		if (ha->response_out == (RESPONSE_QUEUE_DEPTH - 1)) {
			ha->response_out = 0;
			ha->response_ptr = ha->response_ring;
		} else {
			ha->response_out++;
			ha->response_ptr++;
		}

		/* process entry */
		switch (sts_entry->hdr.entryType) {
		case ET_STATUS:
			/*
			 * Common status - Single completion posted in single
			 * IOSB.
			 */
			qla4xxx_status_entry(ha, sts_entry);
			break;

		case ET_PASSTHRU_STATUS:
			break;

		case ET_STATUS_CONTINUATION:
			/* Just throw away the status continuation entries */
			DEBUG2(printk("scsi%ld: %s: Status Continuation entry "
				      "- ignoring\n", ha->host_no, __func__));
			break;

		case ET_COMMAND:
			/* ISP device queue is full. Command not
			 * accepted by ISP.  Queue command for
			 * later */

			srb = qla4xxx_del_from_active_array(ha,
						    le32_to_cpu(sts_entry->
								handle));
			if (srb == NULL)
				goto exit_prq_invalid_handle;

			DEBUG2(printk("scsi%ld: %s: FW device queue full, "
				      "srb %p\n", ha->host_no, __func__, srb));

			/* ETRY normally by sending it back with
			 * DID_BUS_BUSY */
			srb->cmd->result = DID_BUS_BUSY << 16;
			qla4xxx_srb_compl(ha, srb);
			break;

		case ET_CONTINUE:
			/* Just throw away the continuation entries */
			DEBUG2(printk("scsi%ld: %s: Continuation entry - "
				      "ignoring\n", ha->host_no, __func__));
			break;

		default:
			/*
			 * Invalid entry in response queue, reset RISC
			 * firmware.
			 */
			DEBUG2(printk("scsi%ld: %s: Invalid entry %x in "
				      "response queue \n", ha->host_no,
				      __func__,
				      sts_entry->hdr.entryType));
			goto exit_prq_error;
		}
	}

	/*
	 * Done with responses, update the ISP For QLA4010, this also clears
	 * the interrupt.
	 */
	writel(ha->response_out, &ha->reg->rsp_q_out);
	readl(&ha->reg->rsp_q_out);

	return;

exit_prq_invalid_handle:
	DEBUG2(printk("scsi%ld: %s: Invalid handle(srb)=%p type=%x IOCS=%x\n",
		      ha->host_no, __func__, srb, sts_entry->hdr.entryType,
		      sts_entry->completionStatus));

exit_prq_error: