ql4_os.c

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/**
 * qla4xxx_flush_active_srbs - returns all outstanding i/o requests to O.S.
 * @ha: Pointer to host adapter structure.
 *
 * This routine is called just prior to a HARD RESET to return all
 * outstanding commands back to the Operating System.
 * Caller should make sure that the following locks are released
 * before this calling routine: Hardware lock, and io_request_lock.
 **/
static void qla4xxx_flush_active_srbs(struct scsi_qla_host *ha)
{
	struct srb *srb;
	int i;
	unsigned long flags;

	spin_lock_irqsave(&ha->hardware_lock, flags);
	for (i = 0; i < ha->host->can_queue; i++) {
		srb = qla4xxx_del_from_active_array(ha, i);
		if (srb != NULL) {
			srb->cmd->result = DID_RESET << 16;
			qla4xxx_srb_compl(ha, srb);
		}
	}
	spin_unlock_irqrestore(&ha->hardware_lock, flags);

}

/**
 * qla4xxx_recover_adapter - recovers adapter after a fatal error
 * @ha: Pointer to host adapter structure.
 * @renew_ddb_list: Indicates what to do with the adapter's ddb list
 *	after adapter recovery has completed.
 *	0=preserve ddb list, 1=destroy and rebuild ddb list
 **/
static int qla4xxx_recover_adapter(struct scsi_qla_host *ha,
				uint8_t renew_ddb_list)
{
	int status;

	/* Stall incoming I/O until we are done */
	clear_bit(AF_ONLINE, &ha->flags);
	DEBUG2(printk("scsi%ld: %s calling qla4xxx_cmd_wait\n", ha->host_no,
		      __func__));

	/* Wait for outstanding commands to complete.
	 * Stalls the driver for max 30 secs
	 */
	status = qla4xxx_cmd_wait(ha);

	qla4xxx_disable_intrs(ha);

	/* Flush any pending ddb changed AENs */
	qla4xxx_process_aen(ha, FLUSH_DDB_CHANGED_AENS);

	/* Reset the firmware.	If successful, function
	 * returns with ISP interrupts enabled.
	 */
	if (status == QLA_SUCCESS) {
		DEBUG2(printk("scsi%ld: %s - Performing soft reset..\n",
			      ha->host_no, __func__));
		qla4xxx_flush_active_srbs(ha);
		if (ql4xxx_lock_drvr_wait(ha) == QLA_SUCCESS)
			status = qla4xxx_soft_reset(ha);
		else
			status = QLA_ERROR;
	}

	/* Flush any pending ddb changed AENs */
	qla4xxx_process_aen(ha, FLUSH_DDB_CHANGED_AENS);

	/* Re-initialize firmware. If successful, function returns
	 * with ISP interrupts enabled */
	if (status == QLA_SUCCESS) {
		DEBUG2(printk("scsi%ld: %s - Initializing adapter..\n",
			      ha->host_no, __func__));

		/* If successful, AF_ONLINE flag set in
		 * qla4xxx_initialize_adapter */
		status = qla4xxx_initialize_adapter(ha, renew_ddb_list);
	}

	/* Failed adapter initialization?
	 * Retry reset_ha only if invoked via DPC (DPC_RESET_HA) */
	if ((test_bit(AF_ONLINE, &ha->flags) == 0) &&
	    (test_bit(DPC_RESET_HA, &ha->dpc_flags))) {
		/* Adapter initialization failed, see if we can retry
		 * resetting the ha */
		if (!test_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags)) {
			ha->retry_reset_ha_cnt = MAX_RESET_HA_RETRIES;
			DEBUG2(printk("scsi%ld: recover adapter - retrying "
				      "(%d) more times\n", ha->host_no,
				      ha->retry_reset_ha_cnt));
			set_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags);
			status = QLA_ERROR;
		} else {
			if (ha->retry_reset_ha_cnt > 0) {
				/* Schedule another Reset HA--DPC will retry */
				ha->retry_reset_ha_cnt--;
				DEBUG2(printk("scsi%ld: recover adapter - "
					      "retry remaining %d\n",
					      ha->host_no,
					      ha->retry_reset_ha_cnt));
				status = QLA_ERROR;
			}

			if (ha->retry_reset_ha_cnt == 0) {
				/* Recover adapter retries have been exhausted.
				 * Adapter DEAD */
				DEBUG2(printk("scsi%ld: recover adapter "
					      "failed - board disabled\n",
					      ha->host_no));
				qla4xxx_flush_active_srbs(ha);
				clear_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags);
				clear_bit(DPC_RESET_HA, &ha->dpc_flags);
				clear_bit(DPC_RESET_HA_DESTROY_DDB_LIST,
					  &ha->dpc_flags);
				status = QLA_ERROR;
			}
		}
	} else {
		clear_bit(DPC_RESET_HA, &ha->dpc_flags);
		clear_bit(DPC_RESET_HA_DESTROY_DDB_LIST, &ha->dpc_flags);
		clear_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags);
	}

	ha->adapter_error_count++;

	if (status == QLA_SUCCESS)
		qla4xxx_enable_intrs(ha);

	DEBUG2(printk("scsi%ld: recover adapter .. DONE\n", ha->host_no));
	return status;
}

/**
 * qla4xxx_do_dpc - dpc routine
 * @data: in our case pointer to adapter structure
 *
 * This routine is a task that is schedule by the interrupt handler
 * to perform the background processing for interrupts.  We put it
 * on a task queue that is consumed whenever the scheduler runs; that's
 * so you can do anything (i.e. put the process to sleep etc).  In fact,
 * the mid-level tries to sleep when it reaches the driver threshold
 * "host->can_queue". This can cause a panic if we were in our interrupt code.
 **/
static void qla4xxx_do_dpc(struct work_struct *work)
{
	struct scsi_qla_host *ha =
		container_of(work, struct scsi_qla_host, dpc_work);
	struct ddb_entry *ddb_entry, *dtemp;
	int status = QLA_ERROR;

	DEBUG2(printk("scsi%ld: %s: DPC handler waking up."
		"flags = 0x%08lx, dpc_flags = 0x%08lx ctrl_stat = 0x%08x\n",
		ha->host_no, __func__, ha->flags, ha->dpc_flags,
		readw(&ha->reg->ctrl_status)));

	/* Initialization not yet finished. Don't do anything yet. */
	if (!test_bit(AF_INIT_DONE, &ha->flags))
		return;

	if (adapter_up(ha) ||
	    test_bit(DPC_RESET_HA, &ha->dpc_flags) ||
	    test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags) ||
	    test_bit(DPC_RESET_HA_DESTROY_DDB_LIST, &ha->dpc_flags)) {
		if (test_bit(DPC_RESET_HA_DESTROY_DDB_LIST, &ha->dpc_flags) ||
			test_bit(DPC_RESET_HA, &ha->dpc_flags))
			qla4xxx_recover_adapter(ha, PRESERVE_DDB_LIST);

		if (test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags)) {
			uint8_t wait_time = RESET_INTR_TOV;

			while ((readw(&ha->reg->ctrl_status) &
				(CSR_SOFT_RESET | CSR_FORCE_SOFT_RESET)) != 0) {
				if (--wait_time == 0)
					break;
				msleep(1000);
			}
			if (wait_time == 0)
				DEBUG2(printk("scsi%ld: %s: SR|FSR "
					      "bit not cleared-- resetting\n",
					      ha->host_no, __func__));
			qla4xxx_flush_active_srbs(ha);
			if (ql4xxx_lock_drvr_wait(ha) == QLA_SUCCESS) {
				qla4xxx_process_aen(ha, FLUSH_DDB_CHANGED_AENS);
				status = qla4xxx_initialize_adapter(ha,
						PRESERVE_DDB_LIST);
			}
			clear_bit(DPC_RESET_HA_INTR, &ha->dpc_flags);
			if (status == QLA_SUCCESS)
				qla4xxx_enable_intrs(ha);
		}
	}

	/* ---- process AEN? --- */
	if (test_and_clear_bit(DPC_AEN, &ha->dpc_flags))
		qla4xxx_process_aen(ha, PROCESS_ALL_AENS);

	/* ---- Get DHCP IP Address? --- */
	if (test_and_clear_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags))
		qla4xxx_get_dhcp_ip_address(ha);

	/* ---- relogin device? --- */
	if (adapter_up(ha) &&
	    test_and_clear_bit(DPC_RELOGIN_DEVICE, &ha->dpc_flags)) {
		list_for_each_entry_safe(ddb_entry, dtemp,
					 &ha->ddb_list, list) {
			if (test_and_clear_bit(DF_RELOGIN, &ddb_entry->flags) &&
			    atomic_read(&ddb_entry->state) != DDB_STATE_ONLINE)
				qla4xxx_relogin_device(ha, ddb_entry);

			/*
			 * If mbx cmd times out there is no point
			 * in continuing further.
			 * With large no of targets this can hang
			 * the system.
			 */
			if (test_bit(DPC_RESET_HA, &ha->dpc_flags)) {
				printk(KERN_WARNING "scsi%ld: %s: "
				       "need to reset hba\n",
				       ha->host_no, __func__);
				break;
			}
		}
	}
}

/**
 * qla4xxx_free_adapter - release the adapter
 * @ha: pointer to adapter structure
 **/
static void qla4xxx_free_adapter(struct scsi_qla_host *ha)
{

	if (test_bit(AF_INTERRUPTS_ON, &ha->flags)) {
		/* Turn-off interrupts on the card. */
		qla4xxx_disable_intrs(ha);
	}

	/* Kill the kernel thread for this host */
	if (ha->dpc_thread)
		destroy_workqueue(ha->dpc_thread);

	/* Issue Soft Reset to put firmware in unknown state */
	if (ql4xxx_lock_drvr_wait(ha) == QLA_SUCCESS)
		qla4xxx_hw_reset(ha);

	/* Remove timer thread, if present */
	if (ha->timer_active)
		qla4xxx_stop_timer(ha);

	/* Detach interrupts */
	if (test_and_clear_bit(AF_IRQ_ATTACHED, &ha->flags))
		free_irq(ha->pdev->irq, ha);

	/* free extra memory */
	qla4xxx_mem_free(ha);

	pci_disable_device(ha->pdev);

}

/***
 * qla4xxx_iospace_config - maps registers
 * @ha: pointer to adapter structure
 *
 * This routines maps HBA's registers from the pci address space
 * into the kernel virtual address space for memory mapped i/o.
 **/
static int qla4xxx_iospace_config(struct scsi_qla_host *ha)
{
	unsigned long pio, pio_len, pio_flags;
	unsigned long mmio, mmio_len, mmio_flags;

	pio = pci_resource_start(ha->pdev, 0);
	pio_len = pci_resource_len(ha->pdev, 0);
	pio_flags = pci_resource_flags(ha->pdev, 0);
	if (pio_flags & IORESOURCE_IO) {
		if (pio_len < MIN_IOBASE_LEN) {
			dev_warn(&ha->pdev->dev,
				"Invalid PCI I/O region size\n");
			pio = 0;
		}
	} else {
		dev_warn(&ha->pdev->dev, "region #0 not a PIO resource\n");
		pio = 0;
	}

	/* Use MMIO operations for all accesses. */
	mmio = pci_resource_start(ha->pdev, 1);
	mmio_len = pci_resource_len(ha->pdev, 1);
	mmio_flags = pci_resource_flags(ha->pdev, 1);

	if (!(mmio_flags & IORESOURCE_MEM)) {
		dev_err(&ha->pdev->dev,
			"region #0 not an MMIO resource, aborting\n");

		goto iospace_error_exit;
	}
	if (mmio_len < MIN_IOBASE_LEN) {
		dev_err(&ha->pdev->dev,
			"Invalid PCI mem region size, aborting\n");
		goto iospace_error_exit;
	}

	if (pci_request_regions(ha->pdev, DRIVER_NAME)) {
		dev_warn(&ha->pdev->dev,
			"Failed to reserve PIO/MMIO regions\n");

		goto iospace_error_exit;
	}

	ha->pio_address = pio;
	ha->pio_length = pio_len;
	ha->reg = ioremap(mmio, MIN_IOBASE_LEN);
	if (!ha->reg) {
		dev_err(&ha->pdev->dev,
			"cannot remap MMIO, aborting\n");

		goto iospace_error_exit;
	}

	return 0;

iospace_error_exit:
	return -ENOMEM;
}

/**
 * qla4xxx_probe_adapter - callback function to probe HBA
 * @pdev: pointer to pci_dev structure
 * @pci_device_id: pointer to pci_device entry
 *
 * This routine will probe for Qlogic 4xxx iSCSI host adapters.
 * It returns zero if successful. It also initializes all data necessary for
 * the driver.
 **/
static int __devinit qla4xxx_probe_adapter(struct pci_dev *pdev,
					   const struct pci_device_id *ent)
{
	int ret = -ENODEV, status;
	struct Scsi_Host *host;
	struct scsi_qla_host *ha;
	struct ddb_entry *ddb_entry, *ddbtemp;
	uint8_t init_retry_count = 0;
	char buf[34];

	if (pci_enable_device(pdev))
		return -1;

	host = scsi_host_alloc(&qla4xxx_driver_template, sizeof(*ha));
	if (host == NULL) {
		printk(KERN_WARNING
		       "qla4xxx: Couldn't allocate host from scsi layer!\n");
		goto probe_disable_device;
	}

	/* Clear our data area */
	ha = (struct scsi_qla_host *) host->hostdata;
	memset(ha, 0, sizeof(*ha));

	/* Save the information from PCI BIOS.	*/
	ha->pdev = pdev;
	ha->host = host;
	ha->host_no = host->host_no;

	/* Configure PCI I/O space. */
	ret = qla4xxx_iospace_config(ha);
	if (ret)
		goto probe_failed;

	dev_info(&ha->pdev->dev, "Found an ISP%04x, irq %d, iobase 0x%p\n",
		   pdev->device, pdev->irq, ha->reg);

	qla4xxx_config_dma_addressing(ha);

	/* Initialize lists and spinlocks. */
	INIT_LIST_HEAD(&ha->ddb_list);
	INIT_LIST_HEAD(&ha->free_srb_q);

	mutex_init(&ha->mbox_sem);

	spin_lock_init(&ha->hardware_lock);

	/* Allocate dma buffers */
	if (qla4xxx_mem_alloc(ha)) {
		dev_warn(&ha->pdev->dev,
			   "[ERROR] Failed to allocate memory for adapter\n");

		ret = -ENOMEM;
		goto probe_failed;
	}

	/*
	 * Initialize the Host adapter request/response queues and
	 * firmware
	 * NOTE: interrupts enabled upon successful completion
	 */
	status = qla4xxx_initialize_adapter(ha, REBUILD_DDB_LIST);
	while (status == QLA_ERROR && init_retry_count++ < MAX_INIT_RETRIES) {
		DEBUG2(printk("scsi: %s: retrying adapter initialization "
			      "(%d)\n", __func__, init_retry_count));
		qla4xxx_soft_reset(ha);
		status = qla4xxx_initialize_adapter(ha, REBUILD_DDB_LIST);
	}
	if (status == QLA_ERROR) {
		dev_warn(&ha->pdev->dev, "Failed to initialize adapter\n");

		ret = -ENODEV;
		goto probe_failed;
	}

	host->cmd_per_lun = 3;
	host->max_channel = 0;
	host->max_lun = MAX_LUNS - 1;
	host->max_id = MAX_TARGETS;
	host->max_cmd_len = IOCB_MAX_CDB_LEN;
	host->can_queue = MAX_SRBS ;
	host->transportt = qla4xxx_scsi_transport;

        ret = scsi_init_shared_tag_map(host, MAX_SRBS);
        if (ret) {
                dev_warn(&ha->pdev->dev, "scsi_init_shared_tag_map failed\n");
                goto probe_failed;
        }

	/* Startup the kernel thread for this host adapter. */
	DEBUG2(printk("scsi: %s: Starting kernel thread for "
		      "qla4xxx_dpc\n", __func__));
	sprintf(buf, "qla4xxx_%lu_dpc", ha->host_no);
	ha->dpc_thread = create_singlethread_workqueue(buf);
	if (!ha->dpc_thread) {
		dev_warn(&ha->pdev->dev, "Unable to start DPC thread!\n");