ql4_os.c

来自「linux 内核源代码」· C语言 代码 · 共 1,732 行 · 第 1/4 页

		ret = -ENODEV;
		goto probe_failed;
	}
	INIT_WORK(&ha->dpc_work, qla4xxx_do_dpc);

	ret = request_irq(pdev->irq, qla4xxx_intr_handler,
			  IRQF_DISABLED | IRQF_SHARED, "qla4xxx", ha);
	if (ret) {
		dev_warn(&ha->pdev->dev, "Failed to reserve interrupt %d"
			" already in use.\n", pdev->irq);
		goto probe_failed;
	}
	set_bit(AF_IRQ_ATTACHED, &ha->flags);
	host->irq = pdev->irq;
	DEBUG(printk("scsi%d: irq %d attached\n", ha->host_no, ha->pdev->irq));

	qla4xxx_enable_intrs(ha);

	/* Start timer thread. */
	qla4xxx_start_timer(ha, qla4xxx_timer, 1);

	set_bit(AF_INIT_DONE, &ha->flags);

	pci_set_drvdata(pdev, ha);

	ret = scsi_add_host(host, &pdev->dev);
	if (ret)
		goto probe_failed;

	/* Update transport device information for all devices. */
	list_for_each_entry_safe(ddb_entry, ddbtemp, &ha->ddb_list, list) {
		if (ddb_entry->fw_ddb_device_state == DDB_DS_SESSION_ACTIVE)
			if (qla4xxx_add_sess(ddb_entry))
				goto remove_host;
	}

	printk(KERN_INFO
	       " QLogic iSCSI HBA Driver version: %s\n"
	       "  QLogic ISP%04x @ %s, host#=%ld, fw=%02d.%02d.%02d.%02d\n",
	       qla4xxx_version_str, ha->pdev->device, pci_name(ha->pdev),
	       ha->host_no, ha->firmware_version[0], ha->firmware_version[1],
	       ha->patch_number, ha->build_number);

	return 0;

remove_host:
	qla4xxx_free_ddb_list(ha);
	scsi_remove_host(host);

probe_failed:
	qla4xxx_free_adapter(ha);
	scsi_host_put(ha->host);

probe_disable_device:
	pci_disable_device(pdev);

	return ret;
}

/**
 * qla4xxx_remove_adapter - calback function to remove adapter.
 * @pci_dev: PCI device pointer
 **/
static void __devexit qla4xxx_remove_adapter(struct pci_dev *pdev)
{
	struct scsi_qla_host *ha;

	ha = pci_get_drvdata(pdev);

	qla4xxx_disable_intrs(ha);

	while (test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags))
		ssleep(1);

	/* remove devs from iscsi_sessions to scsi_devices */
	qla4xxx_free_ddb_list(ha);

	scsi_remove_host(ha->host);

	qla4xxx_free_adapter(ha);

	scsi_host_put(ha->host);

	pci_set_drvdata(pdev, NULL);
}

/**
 * qla4xxx_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 qla4xxx_config_dma_addressing(struct scsi_qla_host *ha)
{
	int retval;

	/* Update our PCI device dma_mask for full 64 bit mask */
	if (pci_set_dma_mask(ha->pdev, DMA_64BIT_MASK) == 0) {
		if (pci_set_consistent_dma_mask(ha->pdev, DMA_64BIT_MASK)) {
			dev_dbg(&ha->pdev->dev,
				  "Failed to set 64 bit PCI consistent mask; "
				   "using 32 bit.\n");
			retval = pci_set_consistent_dma_mask(ha->pdev,
							     DMA_32BIT_MASK);
		}
	} else
		retval = pci_set_dma_mask(ha->pdev, DMA_32BIT_MASK);
}

static int qla4xxx_slave_alloc(struct scsi_device *sdev)
{
	struct iscsi_cls_session *sess = starget_to_session(sdev->sdev_target);
	struct ddb_entry *ddb = sess->dd_data;

	sdev->hostdata = ddb;
	sdev->tagged_supported = 1;
	scsi_activate_tcq(sdev, sdev->host->can_queue);
	return 0;
}

static int qla4xxx_slave_configure(struct scsi_device *sdev)
{
	sdev->tagged_supported = 1;
	return 0;
}

static void qla4xxx_slave_destroy(struct scsi_device *sdev)
{
	scsi_deactivate_tcq(sdev, 1);
}

/**
 * qla4xxx_del_from_active_array - returns an active srb
 * @ha: Pointer to host adapter structure.
 * @index: index into to the active_array
 *
 * This routine removes and returns the srb at the specified index
 **/
struct srb * qla4xxx_del_from_active_array(struct scsi_qla_host *ha, uint32_t index)
{
	struct srb *srb = NULL;
	struct scsi_cmnd *cmd;

	if (!(cmd = scsi_host_find_tag(ha->host, index)))
		return srb;

	if (!(srb = (struct srb *)cmd->host_scribble))
		return srb;

	/* update counters */
	if (srb->flags & SRB_DMA_VALID) {
		ha->req_q_count += srb->iocb_cnt;
		ha->iocb_cnt -= srb->iocb_cnt;
		if (srb->cmd)
			srb->cmd->host_scribble = NULL;
	}
	return srb;
}

/**
 * qla4xxx_eh_wait_on_command - waits for command to be returned by firmware
 * @ha: actual ha whose done queue will contain the comd returned by firmware.
 * @cmd: Scsi Command to wait on.
 *
 * This routine waits for the command to be returned by the Firmware
 * for some max time.
 **/
static int qla4xxx_eh_wait_on_command(struct scsi_qla_host *ha,
				      struct scsi_cmnd *cmd)
{
	int done = 0;
	struct srb *rp;
	uint32_t max_wait_time = EH_WAIT_CMD_TOV;

	do {
		/* Checking to see if its returned to OS */
		rp = (struct srb *) cmd->SCp.ptr;
		if (rp == NULL) {
			done++;
			break;
		}

		msleep(2000);
	} while (max_wait_time--);

	return done;
}

/**
 * qla4xxx_wait_for_hba_online - waits for HBA to come online
 * @ha: Pointer to host adapter structure
 **/
static int qla4xxx_wait_for_hba_online(struct scsi_qla_host *ha)
{
	unsigned long wait_online;

	wait_online = jiffies + (30 * HZ);
	while (time_before(jiffies, wait_online)) {

		if (adapter_up(ha))
			return QLA_SUCCESS;
		else if (ha->retry_reset_ha_cnt == 0)
			return QLA_ERROR;

		msleep(2000);
	}

	return QLA_ERROR;
}

/**
 * qla4xxx_eh_wait_for_active_target_commands - wait for active cmds to finish.
 * @ha: pointer to to HBA
 * @t: target id
 * @l: lun id
 *
 * This function waits for all outstanding commands to a lun to complete. It
 * returns 0 if all pending commands are returned and 1 otherwise.
 **/
static int qla4xxx_eh_wait_for_active_target_commands(struct scsi_qla_host *ha,
						 int t, int l)
{
	int cnt;
	int status = 0;
	struct scsi_cmnd *cmd;

	/*
	 * Waiting for all commands for the designated target in the active
	 * array
	 */
	for (cnt = 0; cnt < ha->host->can_queue; cnt++) {
		cmd = scsi_host_find_tag(ha->host, cnt);
		if (cmd && cmd->device->id == t && cmd->device->lun == l) {
			if (!qla4xxx_eh_wait_on_command(ha, cmd)) {
				status++;
				break;
			}
		}
	}
	return status;
}

/**
 * qla4xxx_eh_device_reset - callback for target reset.
 * @cmd: Pointer to Linux's SCSI command structure
 *
 * This routine is called by the Linux OS to reset all luns on the
 * specified target.
 **/
static int qla4xxx_eh_device_reset(struct scsi_cmnd *cmd)
{
	struct scsi_qla_host *ha = to_qla_host(cmd->device->host);
	struct ddb_entry *ddb_entry = cmd->device->hostdata;
	struct srb *sp;
	int ret = FAILED, stat;

	sp = (struct srb *) cmd->SCp.ptr;
	if (!sp || !ddb_entry)
		return ret;

	dev_info(&ha->pdev->dev,
		   "scsi%ld:%d:%d:%d: DEVICE RESET ISSUED.\n", ha->host_no,
		   cmd->device->channel, cmd->device->id, cmd->device->lun);

	DEBUG2(printk(KERN_INFO
		      "scsi%ld: DEVICE_RESET cmd=%p jiffies = 0x%lx, to=%x,"
		      "dpc_flags=%lx, status=%x allowed=%d\n", ha->host_no,
		      cmd, jiffies, cmd->timeout_per_command / HZ,
		      ha->dpc_flags, cmd->result, cmd->allowed));

	/* FIXME: wait for hba to go online */
	stat = qla4xxx_reset_lun(ha, ddb_entry, cmd->device->lun);
	if (stat != QLA_SUCCESS) {
		dev_info(&ha->pdev->dev, "DEVICE RESET FAILED. %d\n", stat);
		goto eh_dev_reset_done;
	}

	/* Send marker. */
	ha->marker_needed = 1;

	/*
	 * If we are coming down the EH path, wait for all commands to complete
	 * for the device.
	 */
	if (cmd->device->host->shost_state == SHOST_RECOVERY) {
		if (qla4xxx_eh_wait_for_active_target_commands(ha,
							  cmd->device->id,
							  cmd->device->lun)){
			dev_info(&ha->pdev->dev,
				   "DEVICE RESET FAILED - waiting for "
				   "commands.\n");
			goto eh_dev_reset_done;
		}
	}

	dev_info(&ha->pdev->dev,
		   "scsi(%ld:%d:%d:%d): DEVICE RESET SUCCEEDED.\n",
		   ha->host_no, cmd->device->channel, cmd->device->id,
		   cmd->device->lun);

	ret = SUCCESS;

eh_dev_reset_done:

	return ret;
}

/**
 * qla4xxx_eh_host_reset - kernel callback
 * @cmd: Pointer to Linux's SCSI command structure
 *
 * This routine is invoked by the Linux kernel to perform fatal error
 * recovery on the specified adapter.
 **/
static int qla4xxx_eh_host_reset(struct scsi_cmnd *cmd)
{
	int return_status = FAILED;
	struct scsi_qla_host *ha;

	ha = (struct scsi_qla_host *) cmd->device->host->hostdata;

	dev_info(&ha->pdev->dev,
		   "scsi(%ld:%d:%d:%d): ADAPTER RESET ISSUED.\n", ha->host_no,
		   cmd->device->channel, cmd->device->id, cmd->device->lun);

	if (qla4xxx_wait_for_hba_online(ha) != QLA_SUCCESS) {
		DEBUG2(printk("scsi%ld:%d: %s: Unable to reset host.  Adapter "
			      "DEAD.\n", ha->host_no, cmd->device->channel,
			      __func__));

		return FAILED;
	}

	if (qla4xxx_recover_adapter(ha, PRESERVE_DDB_LIST) == QLA_SUCCESS) {
		return_status = SUCCESS;
	}

	dev_info(&ha->pdev->dev, "HOST RESET %s.\n",
		   return_status == FAILED ? "FAILED" : "SUCCEDED");

	return return_status;
}


static struct pci_device_id qla4xxx_pci_tbl[] = {
	{
		.vendor		= PCI_VENDOR_ID_QLOGIC,
		.device		= PCI_DEVICE_ID_QLOGIC_ISP4010,
		.subvendor	= PCI_ANY_ID,
		.subdevice	= PCI_ANY_ID,
	},
	{
		.vendor		= PCI_VENDOR_ID_QLOGIC,
		.device		= PCI_DEVICE_ID_QLOGIC_ISP4022,
		.subvendor	= PCI_ANY_ID,
		.subdevice	= PCI_ANY_ID,
	},
	{
		.vendor		= PCI_VENDOR_ID_QLOGIC,
		.device		= PCI_DEVICE_ID_QLOGIC_ISP4032,
		.subvendor	= PCI_ANY_ID,
		.subdevice	= PCI_ANY_ID,
	},
	{0, 0},
};
MODULE_DEVICE_TABLE(pci, qla4xxx_pci_tbl);

static struct pci_driver qla4xxx_pci_driver = {
	.name		= DRIVER_NAME,
	.id_table	= qla4xxx_pci_tbl,
	.probe		= qla4xxx_probe_adapter,
	.remove		= qla4xxx_remove_adapter,
};

static int __init qla4xxx_module_init(void)
{
	int ret;

	/* Allocate cache for SRBs. */
	srb_cachep = kmem_cache_create("qla4xxx_srbs", sizeof(struct srb), 0,
				       SLAB_HWCACHE_ALIGN, NULL);
	if (srb_cachep == NULL) {
		printk(KERN_ERR
		       "%s: Unable to allocate SRB cache..."
		       "Failing load!\n", DRIVER_NAME);
		ret = -ENOMEM;
		goto no_srp_cache;
	}

	/* Derive version string. */
	strcpy(qla4xxx_version_str, QLA4XXX_DRIVER_VERSION);
	if (ql4xextended_error_logging)
		strcat(qla4xxx_version_str, "-debug");

	qla4xxx_scsi_transport =
		iscsi_register_transport(&qla4xxx_iscsi_transport);
	if (!qla4xxx_scsi_transport){
		ret = -ENODEV;
		goto release_srb_cache;
	}

	ret = pci_register_driver(&qla4xxx_pci_driver);
	if (ret)
		goto unregister_transport;

	printk(KERN_INFO "QLogic iSCSI HBA Driver\n");
	return 0;

unregister_transport:
	iscsi_unregister_transport(&qla4xxx_iscsi_transport);
release_srb_cache:
	kmem_cache_destroy(srb_cachep);
no_srp_cache:
	return ret;
}

static void __exit qla4xxx_module_exit(void)
{
	ql4_mod_unload = 1;
	pci_unregister_driver(&qla4xxx_pci_driver);
	iscsi_unregister_transport(&qla4xxx_iscsi_transport);
	kmem_cache_destroy(srb_cachep);
}

module_init(qla4xxx_module_init);
module_exit(qla4xxx_module_exit);

MODULE_AUTHOR("QLogic Corporation");
MODULE_DESCRIPTION("QLogic iSCSI HBA Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(QLA4XXX_DRIVER_VERSION);