qla_os.c

h内核

	scsi_qla_host_t *ha;
	srb_t *sp;
	int rval = FAILED;

	ha = (scsi_qla_host_t *) cmd->device->host->hostdata;
	sp = (srb_t *) CMD_SP(cmd);

	qla_printk(KERN_INFO, ha,
	    "scsi(%ld:%d:%d:%d): LOOP RESET ISSUED.\n", ha->host_no,
	    cmd->device->channel, cmd->device->id, cmd->device->lun);

	spin_unlock_irq(ha->host->host_lock);

	if (qla2x00_wait_for_hba_online(ha) != QLA_SUCCESS) {
		DEBUG2(printk("%s failed:board disabled\n",__func__));
		spin_lock_irq(ha->host->host_lock);
		return FAILED;
	}

	if (qla2x00_wait_for_loop_ready(ha) == QLA_SUCCESS) {
		if (qla2x00_loop_reset(ha) == QLA_SUCCESS) 
			rval = SUCCESS;
	}

	spin_lock_irq(ha->host->host_lock);
	if (rval == FAILED)
		goto out;

	/* Waiting for our command in done_queue to be returned to OS.*/
	if (cmd->device->host->eh_active)
		if (!qla2x00_eh_wait_for_pending_commands(ha))
			rval = FAILED;

 out:
	qla_printk(KERN_INFO, ha, "%s: reset %s\n", __func__,
			(rval == FAILED) ? "failed" : "succeded");

	return rval;
}

/**************************************************************************
* qla2xxx_eh_host_reset
*
* Description:
*    The reset function will reset the Adapter.
*
* Input:
*      cmd = Linux SCSI command packet of the command that cause the
*            adapter reset.
*
* Returns:
*      Either SUCCESS or FAILED.
*
* Note:
**************************************************************************/
int
qla2xxx_eh_host_reset(struct scsi_cmnd *cmd)
{
	scsi_qla_host_t *ha = (scsi_qla_host_t *)cmd->device->host->hostdata;
	int		rval = SUCCESS;

	/* Display which one we're actually resetting for debug. */
	DEBUG(printk("qla2xxx_eh_host_reset:Resetting scsi(%ld).\n",
	    ha->host_no));

	/*
	 *  Now issue reset.
	 */
	qla_printk(KERN_INFO, ha,
	    "scsi(%ld:%d:%d:%d): ADAPTER RESET issued.\n", ha->host_no,
	    cmd->device->channel, cmd->device->id, cmd->device->lun);

	spin_unlock_irq(ha->host->host_lock);

	if (qla2x00_wait_for_hba_online(ha) != QLA_SUCCESS)
		goto board_disabled;

	/*
	 * Fixme-may be dpc thread is active and processing
	 * loop_resync,so wait a while for it to 
	 * be completed and then issue big hammer.Otherwise
	 * it may cause I/O failure as big hammer marks the
	 * devices as lost kicking of the port_down_timer
	 * while dpc is stuck for the mailbox to complete.
	 */
	/* Blocking call-Does context switching if loop is Not Ready */
	qla2x00_wait_for_loop_ready(ha);
	set_bit(ABORT_ISP_ACTIVE, &ha->dpc_flags);
	if (qla2x00_abort_isp(ha)) {
		clear_bit(ABORT_ISP_ACTIVE, &ha->dpc_flags);
		/* failed. schedule dpc to try */
		set_bit(ISP_ABORT_NEEDED, &ha->dpc_flags);

		if (qla2x00_wait_for_hba_online(ha) != QLA_SUCCESS)
			goto board_disabled;
	} 

	clear_bit(ABORT_ISP_ACTIVE, &ha->dpc_flags);

	spin_lock_irq(ha->host->host_lock);
	if (rval == FAILED)
		goto out;

	/* Waiting for our command in done_queue to be returned to OS.*/
	if (!qla2x00_eh_wait_for_pending_commands(ha))
		rval = FAILED;

 out:
	qla_printk(KERN_INFO, ha, "%s: reset %s\n", __func__,
			(rval == FAILED) ? "failed" : "succeded");

	return rval;

 board_disabled:
	spin_lock_irq(ha->host->host_lock);

	qla_printk(KERN_INFO, ha, "%s: failed:board disabled\n", __func__);
	return FAILED;
}


/*
* qla2x00_loop_reset
*      Issue loop reset.
*
* Input:
*      ha = adapter block pointer.
*
* Returns:
*      0 = success
*/
static int
qla2x00_loop_reset(scsi_qla_host_t *ha)
{
	int status = QLA_SUCCESS;
	uint16_t t;
	os_tgt_t        *tq;

	if (ha->flags.enable_lip_reset) {
		status = qla2x00_lip_reset(ha);
	}

	if (status == QLA_SUCCESS && ha->flags.enable_target_reset) {
		for (t = 0; t < MAX_FIBRE_DEVICES; t++) {
			if ((tq = TGT_Q(ha, t)) == NULL)
				continue;

			if (tq->fcport == NULL)
				continue;

			status = qla2x00_target_reset(ha, 0, t);
			if (status != QLA_SUCCESS) {
				break;
			}
		}
	}

	if (status == QLA_SUCCESS &&
		((!ha->flags.enable_target_reset && 
		  !ha->flags.enable_lip_reset) ||
		ha->flags.enable_lip_full_login)) {

		status = qla2x00_full_login_lip(ha);
	}

	/* Issue marker command only when we are going to start the I/O */
	ha->marker_needed = 1;

	if (status) {
		/* Empty */
		DEBUG2_3(printk("%s(%ld): **** FAILED ****\n",
				__func__,
				ha->host_no);)
	} else {
		/* Empty */
		DEBUG3(printk("%s(%ld): exiting normally.\n",
				__func__,
				ha->host_no);)
	}

	return(status);
}

/*
 * qla2x00_device_reset
 *	Issue bus device reset message to the target.
 *
 * Input:
 *	ha = adapter block pointer.
 *	t = SCSI ID.
 *	TARGET_QUEUE_LOCK must be released.
 *	ADAPTER_STATE_LOCK must be released.
 *
 * Context:
 *	Kernel context.
 */
static int
qla2x00_device_reset(scsi_qla_host_t *ha, fc_port_t *reset_fcport)
{
	/* Abort Target command will clear Reservation */
	return qla2x00_abort_target(reset_fcport);
}

/**************************************************************************
* qla2xxx_slave_configure
*
* Description:
**************************************************************************/
int
qla2xxx_slave_configure(struct scsi_device *sdev)
{
	scsi_qla_host_t *ha = to_qla_host(sdev->host);
	int queue_depth;

	if (IS_QLA2100(ha) || IS_QLA2200(ha))
		queue_depth = 16;
	else
		queue_depth = 32;

	if (sdev->tagged_supported) {
		if (ql2xmaxqdepth != 0 && ql2xmaxqdepth <= 0xffffU)
			queue_depth = ql2xmaxqdepth;

		ql2xmaxqdepth = queue_depth;

		scsi_activate_tcq(sdev, queue_depth);

		qla_printk(KERN_INFO, ha,
		    "scsi(%d:%d:%d:%d): Enabled tagged queuing, queue "
		    "depth %d.\n",
		    sdev->host->host_no, sdev->channel, sdev->id, sdev->lun,
		    sdev->queue_depth);
	} else {
		 scsi_adjust_queue_depth(sdev, 0 /* TCQ off */,
		     sdev->host->hostt->cmd_per_lun /* 3 */);
	}

	return (0);
}

/**
 * qla2x00_config_dma_addressing() - Configure OS DMA addressing method.
 * @ha: HA context
 *
 * At exit, the @ha's flags.enable_64bit_addressing set to indicated
 * supported addressing method.
 */
static void
qla2x00_config_dma_addressing(scsi_qla_host_t *ha)
{
	/* Assume 32bit DMA address */
	ha->flags.enable_64bit_addressing = 0;
	ha->calc_request_entries = qla2x00_calc_iocbs_32;
	ha->build_scsi_iocbs = qla2x00_build_scsi_iocbs_32;

	/*
	 * Given the two variants pci_set_dma_mask(), allow the compiler to
	 * assist in setting the proper dma mask.
	 */
	if (sizeof(dma_addr_t) > 4) {
		if (pci_set_dma_mask(ha->pdev, DMA_64BIT_MASK) == 0) {
			ha->flags.enable_64bit_addressing = 1;
			ha->calc_request_entries = qla2x00_calc_iocbs_64;
			ha->build_scsi_iocbs = qla2x00_build_scsi_iocbs_64;

			if (pci_set_consistent_dma_mask(ha->pdev,
			    DMA_64BIT_MASK)) {
				qla_printk(KERN_DEBUG, ha, 
				    "Failed to set 64 bit PCI consistent mask; "
				    "using 32 bit.\n");
				pci_set_consistent_dma_mask(ha->pdev,
				    DMA_32BIT_MASK);
			}
		} else {
			qla_printk(KERN_DEBUG, ha,
			    "Failed to set 64 bit PCI DMA mask, falling back "
			    "to 32 bit MASK.\n");
			pci_set_dma_mask(ha->pdev, DMA_32BIT_MASK);
		}
	} else {
		pci_set_dma_mask(ha->pdev, DMA_32BIT_MASK);
	}
}

static int
qla2x00_iospace_config(scsi_qla_host_t *ha)
{
	unsigned long	pio, pio_len, pio_flags;
	unsigned long	mmio, mmio_len, mmio_flags;

	/* We only need PIO for Flash operations on ISP2312 v2 chips. */
	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) {
			qla_printk(KERN_WARNING, ha,
			    "Invalid PCI I/O region size (%s)...\n",
			    ha->pdev->slot_name);
			pio = 0;
		}
	} else {
		qla_printk(KERN_WARNING, ha,
		    "region #0 not a PIO resource (%s)...\n",
		    ha->pdev->slot_name);
		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)) {
		qla_printk(KERN_ERR, ha,
		    "region #0 not an MMIO resource (%s), aborting\n",
		    ha->pdev->slot_name);
		goto iospace_error_exit;
	}
	if (mmio_len < MIN_IOBASE_LEN) {
		qla_printk(KERN_ERR, ha,
		    "Invalid PCI mem region size (%s), aborting\n",
		    ha->pdev->slot_name);
		goto iospace_error_exit;
	}

	if (pci_request_regions(ha->pdev, ha->brd_info->drv_name)) {
		qla_printk(KERN_WARNING, ha,
		    "Failed to reserve PIO/MMIO regions (%s)\n", 
		    ha->pdev->slot_name);

		goto iospace_error_exit;
	}

	ha->pio_address = pio;
	ha->pio_length = pio_len;
	ha->iobase = ioremap(mmio, MIN_IOBASE_LEN);
	if (!ha->iobase) {
		qla_printk(KERN_ERR, ha,
		    "cannot remap MMIO (%s), aborting\n", ha->pdev->slot_name);

		goto iospace_error_exit;
	}

	return (0);

iospace_error_exit:
	return (-ENOMEM);
}

/*
 * PCI driver interface
 */
int qla2x00_probe_one(struct pci_dev *pdev, struct qla_board_info *brd_info)
{
	int	ret;
	device_reg_t __iomem *reg;
	struct Scsi_Host *host;
	scsi_qla_host_t *ha;
	unsigned long	flags = 0;
	unsigned long	wait_switch = 0;
	char pci_info[20];
	char fw_str[30];

	if (pci_enable_device(pdev))
		return -1;

	host = scsi_host_alloc(&qla2x00_driver_template,
	    sizeof(scsi_qla_host_t));
	if (host == NULL) {
		printk(KERN_WARNING
		    "qla2xxx: Couldn't allocate host from scsi layer!\n");
		goto probe_disable_device;
	}

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

	ha->pdev = pdev;
	ha->host = host;
	ha->host_no = host->host_no;
	ha->brd_info = brd_info;
	sprintf(ha->host_str, "%s_%ld", ha->brd_info->drv_name, ha->host_no);

	/* Configure PCI I/O space */
	ret = qla2x00_iospace_config(ha);
	if (ret != 0) {
		goto probe_failed;
	}

	/* Sanitize the information from PCI BIOS. */
	host->irq = pdev->irq;

	qla_printk(KERN_INFO, ha,
	    "Found an %s, irq %d, iobase 0x%p\n", ha->brd_info->isp_name,
	    host->irq, ha->iobase);

	spin_lock_init(&ha->hardware_lock);

	/* 4.23 Initialize /proc/scsi/qla2x00 counters */
	ha->actthreads = 0;
	ha->qthreads   = 0;
	ha->total_isr_cnt = 0;
	ha->total_isp_aborts = 0;
	ha->total_lip_cnt = 0;
	ha->total_dev_errs = 0;
	ha->total_ios = 0;
	ha->total_bytes = 0;

	ha->prev_topology = 0;
	ha->ports = MAX_BUSES;

	if (IS_QLA2100(ha)) {
		ha->max_targets = MAX_TARGETS_2100;
		ha->mbx_count = MAILBOX_REGISTER_COUNT_2100;
		ha->request_q_length = REQUEST_ENTRY_CNT_2100;
		ha->response_q_length = RESPONSE_ENTRY_CNT_2100;
		ha->last_loop_id = SNS_LAST_LOOP_ID_2100;
		host->sg_tablesize = 32;
	} else if (IS_QLA2200(ha)) {
		ha->max_targets = MAX_TARGETS_2200;
		ha->mbx_count = MAILBOX_REGISTER_COUNT;
		ha->request_q_length = REQUEST_ENTRY_CNT_2200;
		ha->response_q_length = RESPONSE_ENTRY_CNT_2100;
		ha->last_loop_id = SNS_LAST_LOOP_ID_2100;
	} else /*if (IS_QLA2300(ha))*/ {
		ha->max_targets = MAX_TARGETS_2200;
		ha->mbx_count = MAILBOX_REGISTER_COUNT;
		ha->request_q_length = REQUEST_ENTRY_CNT_2200;
		ha->response_q_length = RESPONSE_ENTRY_CNT_2300;
		ha->last_loop_id = SNS_LAST_LOOP_ID_2300;
	}
	host->can_queue = ha->request_q_length + 128;

	/* load the F/W, read paramaters, and init the H/W */
	ha->instance = num_hosts;

	init_MUTEX(&ha->mbx_cmd_sem);
	init_MUTEX_LOCKED(&ha->mbx_intr_sem);

	INIT_LIST_HEAD(&ha->list);
	INIT_LIST_HEAD(&ha->fcports);
	INIT_LIST_HEAD(&ha->rscn_fcports);
	INIT_LIST_HEAD(&ha->done_queue);
	INIT_LIST_HEAD(&ha->retry_queue);
	INIT_LIST_HEAD(&ha->scsi_retry_queue);
	INIT_LIST_HEAD(&ha->pending_queue);

	/*
	 * These locks are used to prevent more than one CPU
	 * from modifying the queue at the same time. The
	 * higher level "host_lock" will reduce most
	 * contention for these locks.
	 */
	spin_lock_init(&ha->mbx_reg_lock);
	spin_lock_init(&ha->list_lock);

	ha->dpc_pid = -1;
	init_completion(&ha->dpc_inited);
	init_completion(&ha->dpc_exited);

	qla2x00_config_dma_addressing(ha);
	if (qla2x00_mem_alloc(ha)) {
		qla_printk(KERN_WARNING, ha,
		    "[ERROR] Failed to allocate memory for adapter\n");

		goto probe_failed;
	}

	if (qla2x00_initialize_adapter(ha) &&
	    !(ha->device_flags & DFLG_NO_CABLE)) {

		qla_printk(KERN_WARNING, ha,
		    "Failed to initialize adapter\n");

		DEBUG2(printk("scsi(%ld): Failed to initialize adapter - "
		    "Adapter flags %x.\n",
		    ha->host_no, ha->device_flags));

		goto probe_failed;
	}

	/*
	 * Startup the kernel thread for this host adapter
	 */
	ha->dpc_should_die = 0;
	ha->dpc_pid = kernel_thread(qla2x00_do_dpc, ha, 0);
	if (ha->dpc_pid < 0) {
		qla_printk(KERN_WARNING, ha,
		    "Unable to start DPC thread!\n");

		goto probe_failed;
	}
	wait_for_completion(&ha->dpc_inited);

	host->this_id = 255;
	host->cmd_per_lun = 3;
	host->max_cmd_len = MAX_CMDSZ;
	host->max_channel = ha->ports - 1;
	host->max_lun = ha->max_luns;
	BUG_ON(qla2xxx_transport_template == NULL);
	host->transportt = qla2xxx_transport_template;
	host->unique_id = ha->instance;
	host->max_id = ha->max_targets;

	if (IS_QLA2100(ha) || IS_QLA2200(ha))
		ret = request_irq(host->irq, qla2100_intr_handler,
		    SA_INTERRUPT|SA_SHIRQ, ha->brd_info->drv_name, ha);
	else
		ret = request_irq(host->irq, qla2300_intr_handler,
		    SA_INTERRUPT|SA_SHIRQ, ha->brd_info->drv_name, ha);
	if (ret != 0) {
		qla_printk(KERN_WARNING, ha,
		    "Failed to reserve interrupt %d already in use.\n",
		    host->irq);
		goto probe_failed;