ibmvfc.c 118.9 KB
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/*
 * ibmvfc.c -- driver for IBM Power Virtual Fibre Channel Adapter
 *
 * Written By: Brian King <brking@linux.vnet.ibm.com>, IBM Corporation
 *
 * Copyright (C) IBM Corporation, 2008
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/dma-mapping.h>
#include <linux/dmapool.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/kthread.h>
#include <linux/of.h>
#include <linux/stringify.h>
#include <asm/firmware.h>
#include <asm/irq.h>
#include <asm/vio.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsi_transport_fc.h>
#include "ibmvfc.h"

static unsigned int init_timeout = IBMVFC_INIT_TIMEOUT;
static unsigned int default_timeout = IBMVFC_DEFAULT_TIMEOUT;
static unsigned int max_lun = IBMVFC_MAX_LUN;
static unsigned int max_targets = IBMVFC_MAX_TARGETS;
static unsigned int max_requests = IBMVFC_MAX_REQUESTS_DEFAULT;
static unsigned int disc_threads = IBMVFC_MAX_DISC_THREADS;
static unsigned int dev_loss_tmo = IBMVFC_DEV_LOSS_TMO;
static unsigned int ibmvfc_debug = IBMVFC_DEBUG;
static unsigned int log_level = IBMVFC_DEFAULT_LOG_LEVEL;
static LIST_HEAD(ibmvfc_head);
static DEFINE_SPINLOCK(ibmvfc_driver_lock);
static struct scsi_transport_template *ibmvfc_transport_template;

MODULE_DESCRIPTION("IBM Virtual Fibre Channel Driver");
MODULE_AUTHOR("Brian King <brking@linux.vnet.ibm.com>");
MODULE_LICENSE("GPL");
MODULE_VERSION(IBMVFC_DRIVER_VERSION);

module_param_named(init_timeout, init_timeout, uint, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds. "
		 "[Default=" __stringify(IBMVFC_INIT_TIMEOUT) "]");
module_param_named(default_timeout, default_timeout, uint, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(default_timeout,
		 "Default timeout in seconds for initialization and EH commands. "
		 "[Default=" __stringify(IBMVFC_DEFAULT_TIMEOUT) "]");
module_param_named(max_requests, max_requests, uint, S_IRUGO);
MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter. "
		 "[Default=" __stringify(IBMVFC_MAX_REQUESTS_DEFAULT) "]");
module_param_named(max_lun, max_lun, uint, S_IRUGO);
MODULE_PARM_DESC(max_lun, "Maximum allowed LUN. "
		 "[Default=" __stringify(IBMVFC_MAX_LUN) "]");
module_param_named(max_targets, max_targets, uint, S_IRUGO);
MODULE_PARM_DESC(max_targets, "Maximum allowed targets. "
		 "[Default=" __stringify(IBMVFC_MAX_TARGETS) "]");
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module_param_named(disc_threads, disc_threads, uint, S_IRUGO);
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MODULE_PARM_DESC(disc_threads, "Number of device discovery threads to use. "
		 "[Default=" __stringify(IBMVFC_MAX_DISC_THREADS) "]");
module_param_named(debug, ibmvfc_debug, uint, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Enable driver debug information. "
		 "[Default=" __stringify(IBMVFC_DEBUG) "]");
module_param_named(dev_loss_tmo, dev_loss_tmo, uint, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(dev_loss_tmo, "Maximum number of seconds that the FC "
		 "transport should insulate the loss of a remote port. Once this "
		 "value is exceeded, the scsi target is removed. "
		 "[Default=" __stringify(IBMVFC_DEV_LOSS_TMO) "]");
module_param_named(log_level, log_level, uint, 0);
MODULE_PARM_DESC(log_level, "Set to 0 - 4 for increasing verbosity of device driver. "
		 "[Default=" __stringify(IBMVFC_DEFAULT_LOG_LEVEL) "]");

static const struct {
	u16 status;
	u16 error;
	u8 result;
	u8 retry;
	int log;
	char *name;
} cmd_status [] = {
	{ IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_ESTABLISH, DID_ERROR, 1, 1, "unable to establish" },
	{ IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_FAULT, DID_OK, 1, 0, "transport fault" },
	{ IBMVFC_FABRIC_MAPPED, IBMVFC_CMD_TIMEOUT, DID_TIME_OUT, 1, 1, "command timeout" },
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	{ IBMVFC_FABRIC_MAPPED, IBMVFC_ENETDOWN, DID_TRANSPORT_DISRUPTED, 1, 1, "network down" },
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	{ IBMVFC_FABRIC_MAPPED, IBMVFC_HW_FAILURE, DID_ERROR, 1, 1, "hardware failure" },
	{ IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DOWN_ERR, DID_REQUEUE, 0, 0, "link down" },
	{ IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DEAD_ERR, DID_ERROR, 0, 0, "link dead" },
	{ IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_REGISTER, DID_ERROR, 1, 1, "unable to register" },
	{ IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_BUSY, DID_BUS_BUSY, 1, 0, "transport busy" },
	{ IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_DEAD, DID_ERROR, 0, 1, "transport dead" },
	{ IBMVFC_FABRIC_MAPPED, IBMVFC_CONFIG_ERROR, DID_ERROR, 1, 1, "configuration error" },
	{ IBMVFC_FABRIC_MAPPED, IBMVFC_NAME_SERVER_FAIL, DID_ERROR, 1, 1, "name server failure" },
	{ IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_HALTED, DID_REQUEUE, 0, 0, "link halted" },
	{ IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_GENERAL, DID_OK, 1, 0, "general transport error" },

	{ IBMVFC_VIOS_FAILURE, IBMVFC_CRQ_FAILURE, DID_REQUEUE, 1, 1, "CRQ failure" },
	{ IBMVFC_VIOS_FAILURE, IBMVFC_SW_FAILURE, DID_ERROR, 0, 1, "software failure" },
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	{ IBMVFC_VIOS_FAILURE, IBMVFC_INVALID_PARAMETER, DID_ERROR, 0, 1, "invalid parameter" },
	{ IBMVFC_VIOS_FAILURE, IBMVFC_MISSING_PARAMETER, DID_ERROR, 0, 1, "missing parameter" },
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	{ IBMVFC_VIOS_FAILURE, IBMVFC_HOST_IO_BUS, DID_ERROR, 1, 1, "host I/O bus failure" },
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	{ IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED, DID_ERROR, 0, 1, "transaction cancelled" },
	{ IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED_IMPLICIT, DID_ERROR, 0, 1, "transaction cancelled implicit" },
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	{ IBMVFC_VIOS_FAILURE, IBMVFC_INSUFFICIENT_RESOURCE, DID_REQUEUE, 1, 1, "insufficient resources" },
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	{ IBMVFC_VIOS_FAILURE, IBMVFC_PLOGI_REQUIRED, DID_ERROR, 0, 1, "port login required" },
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	{ IBMVFC_VIOS_FAILURE, IBMVFC_COMMAND_FAILED, DID_ERROR, 1, 1, "command failed" },

	{ IBMVFC_FC_FAILURE, IBMVFC_INVALID_ELS_CMD_CODE, DID_ERROR, 0, 1, "invalid ELS command code" },
	{ IBMVFC_FC_FAILURE, IBMVFC_INVALID_VERSION, DID_ERROR, 0, 1, "invalid version level" },
	{ IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_ERROR, DID_ERROR, 1, 1, "logical error" },
	{ IBMVFC_FC_FAILURE, IBMVFC_INVALID_CT_IU_SIZE, DID_ERROR, 0, 1, "invalid CT_IU size" },
	{ IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_BUSY, DID_REQUEUE, 1, 0, "logical busy" },
	{ IBMVFC_FC_FAILURE, IBMVFC_PROTOCOL_ERROR, DID_ERROR, 1, 1, "protocol error" },
	{ IBMVFC_FC_FAILURE, IBMVFC_UNABLE_TO_PERFORM_REQ, DID_ERROR, 1, 1, "unable to perform request" },
	{ IBMVFC_FC_FAILURE, IBMVFC_CMD_NOT_SUPPORTED, DID_ERROR, 0, 0, "command not supported" },
	{ IBMVFC_FC_FAILURE, IBMVFC_SERVER_NOT_AVAIL, DID_ERROR, 0, 1, "server not available" },
	{ IBMVFC_FC_FAILURE, IBMVFC_CMD_IN_PROGRESS, DID_ERROR, 0, 1, "command already in progress" },
	{ IBMVFC_FC_FAILURE, IBMVFC_VENDOR_SPECIFIC, DID_ERROR, 1, 1, "vendor specific" },

	{ IBMVFC_FC_SCSI_ERROR, 0, DID_OK, 1, 0, "SCSI error" },
};

static void ibmvfc_npiv_login(struct ibmvfc_host *);
static void ibmvfc_tgt_send_prli(struct ibmvfc_target *);
static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *);
static void ibmvfc_tgt_query_target(struct ibmvfc_target *);

static const char *unknown_error = "unknown error";

#ifdef CONFIG_SCSI_IBMVFC_TRACE
/**
 * ibmvfc_trc_start - Log a start trace entry
 * @evt:		ibmvfc event struct
 *
 **/
static void ibmvfc_trc_start(struct ibmvfc_event *evt)
{
	struct ibmvfc_host *vhost = evt->vhost;
	struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd;
	struct ibmvfc_mad_common *mad = &evt->iu.mad_common;
	struct ibmvfc_trace_entry *entry;

	entry = &vhost->trace[vhost->trace_index++];
	entry->evt = evt;
	entry->time = jiffies;
	entry->fmt = evt->crq.format;
	entry->type = IBMVFC_TRC_START;

	switch (entry->fmt) {
	case IBMVFC_CMD_FORMAT:
		entry->op_code = vfc_cmd->iu.cdb[0];
		entry->scsi_id = vfc_cmd->tgt_scsi_id;
		entry->lun = scsilun_to_int(&vfc_cmd->iu.lun);
		entry->tmf_flags = vfc_cmd->iu.tmf_flags;
		entry->u.start.xfer_len = vfc_cmd->iu.xfer_len;
		break;
	case IBMVFC_MAD_FORMAT:
		entry->op_code = mad->opcode;
		break;
	default:
		break;
	};
}

/**
 * ibmvfc_trc_end - Log an end trace entry
 * @evt:		ibmvfc event struct
 *
 **/
static void ibmvfc_trc_end(struct ibmvfc_event *evt)
{
	struct ibmvfc_host *vhost = evt->vhost;
	struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
	struct ibmvfc_mad_common *mad = &evt->xfer_iu->mad_common;
	struct ibmvfc_trace_entry *entry = &vhost->trace[vhost->trace_index++];

	entry->evt = evt;
	entry->time = jiffies;
	entry->fmt = evt->crq.format;
	entry->type = IBMVFC_TRC_END;

	switch (entry->fmt) {
	case IBMVFC_CMD_FORMAT:
		entry->op_code = vfc_cmd->iu.cdb[0];
		entry->scsi_id = vfc_cmd->tgt_scsi_id;
		entry->lun = scsilun_to_int(&vfc_cmd->iu.lun);
		entry->tmf_flags = vfc_cmd->iu.tmf_flags;
		entry->u.end.status = vfc_cmd->status;
		entry->u.end.error = vfc_cmd->error;
		entry->u.end.fcp_rsp_flags = vfc_cmd->rsp.flags;
		entry->u.end.rsp_code = vfc_cmd->rsp.data.info.rsp_code;
		entry->u.end.scsi_status = vfc_cmd->rsp.scsi_status;
		break;
	case IBMVFC_MAD_FORMAT:
		entry->op_code = mad->opcode;
		entry->u.end.status = mad->status;
		break;
	default:
		break;

	};
}

#else
#define ibmvfc_trc_start(evt) do { } while (0)
#define ibmvfc_trc_end(evt) do { } while (0)
#endif

/**
 * ibmvfc_get_err_index - Find the index into cmd_status for the fcp response
 * @status:		status / error class
 * @error:		error
 *
 * Return value:
 *	index into cmd_status / -EINVAL on failure
 **/
static int ibmvfc_get_err_index(u16 status, u16 error)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(cmd_status); i++)
		if ((cmd_status[i].status & status) == cmd_status[i].status &&
		    cmd_status[i].error == error)
			return i;

	return -EINVAL;
}

/**
 * ibmvfc_get_cmd_error - Find the error description for the fcp response
 * @status:		status / error class
 * @error:		error
 *
 * Return value:
 *	error description string
 **/
static const char *ibmvfc_get_cmd_error(u16 status, u16 error)
{
	int rc = ibmvfc_get_err_index(status, error);
	if (rc >= 0)
		return cmd_status[rc].name;
	return unknown_error;
}

/**
 * ibmvfc_get_err_result - Find the scsi status to return for the fcp response
 * @vfc_cmd:	ibmvfc command struct
 *
 * Return value:
 *	SCSI result value to return for completed command
 **/
static int ibmvfc_get_err_result(struct ibmvfc_cmd *vfc_cmd)
{
	int err;
	struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
	int fc_rsp_len = rsp->fcp_rsp_len;

	if ((rsp->flags & FCP_RSP_LEN_VALID) &&
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	    ((fc_rsp_len && fc_rsp_len != 4 && fc_rsp_len != 8) ||
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	     rsp->data.info.rsp_code))
		return DID_ERROR << 16;

	err = ibmvfc_get_err_index(vfc_cmd->status, vfc_cmd->error);
	if (err >= 0)
		return rsp->scsi_status | (cmd_status[err].result << 16);
	return rsp->scsi_status | (DID_ERROR << 16);
}

/**
 * ibmvfc_retry_cmd - Determine if error status is retryable
 * @status:		status / error class
 * @error:		error
 *
 * Return value:
 *	1 if error should be retried / 0 if it should not
 **/
static int ibmvfc_retry_cmd(u16 status, u16 error)
{
	int rc = ibmvfc_get_err_index(status, error);

	if (rc >= 0)
		return cmd_status[rc].retry;
	return 1;
}

static const char *unknown_fc_explain = "unknown fc explain";

static const struct {
	u16 fc_explain;
	char *name;
} ls_explain [] = {
	{ 0x00, "no additional explanation" },
	{ 0x01, "service parameter error - options" },
	{ 0x03, "service parameter error - initiator control" },
	{ 0x05, "service parameter error - recipient control" },
	{ 0x07, "service parameter error - received data field size" },
	{ 0x09, "service parameter error - concurrent seq" },
	{ 0x0B, "service parameter error - credit" },
	{ 0x0D, "invalid N_Port/F_Port_Name" },
	{ 0x0E, "invalid node/Fabric Name" },
	{ 0x0F, "invalid common service parameters" },
	{ 0x11, "invalid association header" },
	{ 0x13, "association header required" },
	{ 0x15, "invalid originator S_ID" },
	{ 0x17, "invalid OX_ID-RX-ID combination" },
	{ 0x19, "command (request) already in progress" },
	{ 0x1E, "N_Port Login requested" },
	{ 0x1F, "Invalid N_Port_ID" },
};

static const struct {
	u16 fc_explain;
	char *name;
} gs_explain [] = {
	{ 0x00, "no additional explanation" },
	{ 0x01, "port identifier not registered" },
	{ 0x02, "port name not registered" },
	{ 0x03, "node name not registered" },
	{ 0x04, "class of service not registered" },
	{ 0x06, "initial process associator not registered" },
	{ 0x07, "FC-4 TYPEs not registered" },
	{ 0x08, "symbolic port name not registered" },
	{ 0x09, "symbolic node name not registered" },
	{ 0x0A, "port type not registered" },
	{ 0xF0, "authorization exception" },
	{ 0xF1, "authentication exception" },
	{ 0xF2, "data base full" },
	{ 0xF3, "data base empty" },
	{ 0xF4, "processing request" },
	{ 0xF5, "unable to verify connection" },
	{ 0xF6, "devices not in a common zone" },
};

/**
 * ibmvfc_get_ls_explain - Return the FC Explain description text
 * @status:	FC Explain status
 *
 * Returns:
 *	error string
 **/
static const char *ibmvfc_get_ls_explain(u16 status)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(ls_explain); i++)
		if (ls_explain[i].fc_explain == status)
			return ls_explain[i].name;

	return unknown_fc_explain;
}

/**
 * ibmvfc_get_gs_explain - Return the FC Explain description text
 * @status:	FC Explain status
 *
 * Returns:
 *	error string
 **/
static const char *ibmvfc_get_gs_explain(u16 status)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(gs_explain); i++)
		if (gs_explain[i].fc_explain == status)
			return gs_explain[i].name;

	return unknown_fc_explain;
}

static const struct {
	enum ibmvfc_fc_type fc_type;
	char *name;
} fc_type [] = {
	{ IBMVFC_FABRIC_REJECT, "fabric reject" },
	{ IBMVFC_PORT_REJECT, "port reject" },
	{ IBMVFC_LS_REJECT, "ELS reject" },
	{ IBMVFC_FABRIC_BUSY, "fabric busy" },
	{ IBMVFC_PORT_BUSY, "port busy" },
	{ IBMVFC_BASIC_REJECT, "basic reject" },
};

static const char *unknown_fc_type = "unknown fc type";

/**
 * ibmvfc_get_fc_type - Return the FC Type description text
 * @status:	FC Type error status
 *
 * Returns:
 *	error string
 **/
static const char *ibmvfc_get_fc_type(u16 status)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(fc_type); i++)
		if (fc_type[i].fc_type == status)
			return fc_type[i].name;

	return unknown_fc_type;
}

/**
 * ibmvfc_set_tgt_action - Set the next init action for the target
 * @tgt:		ibmvfc target struct
 * @action:		action to perform
 *
 **/
static void ibmvfc_set_tgt_action(struct ibmvfc_target *tgt,
				  enum ibmvfc_target_action action)
{
	switch (tgt->action) {
	case IBMVFC_TGT_ACTION_DEL_RPORT:
		break;
	default:
		tgt->action = action;
		break;
	}
}

/**
 * ibmvfc_set_host_state - Set the state for the host
 * @vhost:		ibmvfc host struct
 * @state:		state to set host to
 *
 * Returns:
 *	0 if state changed / non-zero if not changed
 **/
static int ibmvfc_set_host_state(struct ibmvfc_host *vhost,
				  enum ibmvfc_host_state state)
{
	int rc = 0;

	switch (vhost->state) {
	case IBMVFC_HOST_OFFLINE:
		rc = -EINVAL;
		break;
	default:
		vhost->state = state;
		break;
	};

	return rc;
}

/**
 * ibmvfc_set_host_action - Set the next init action for the host
 * @vhost:		ibmvfc host struct
 * @action:		action to perform
 *
 **/
static void ibmvfc_set_host_action(struct ibmvfc_host *vhost,
				   enum ibmvfc_host_action action)
{
	switch (action) {
	case IBMVFC_HOST_ACTION_ALLOC_TGTS:
		if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT)
			vhost->action = action;
		break;
	case IBMVFC_HOST_ACTION_INIT_WAIT:
		if (vhost->action == IBMVFC_HOST_ACTION_INIT)
			vhost->action = action;
		break;
	case IBMVFC_HOST_ACTION_QUERY:
		switch (vhost->action) {
		case IBMVFC_HOST_ACTION_INIT_WAIT:
		case IBMVFC_HOST_ACTION_NONE:
		case IBMVFC_HOST_ACTION_TGT_ADD:
			vhost->action = action;
			break;
		default:
			break;
		};
		break;
	case IBMVFC_HOST_ACTION_TGT_INIT:
		if (vhost->action == IBMVFC_HOST_ACTION_ALLOC_TGTS)
			vhost->action = action;
		break;
	case IBMVFC_HOST_ACTION_INIT:
	case IBMVFC_HOST_ACTION_TGT_DEL:
	case IBMVFC_HOST_ACTION_QUERY_TGTS:
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	case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
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	case IBMVFC_HOST_ACTION_TGT_ADD:
	case IBMVFC_HOST_ACTION_NONE:
	default:
		vhost->action = action;
		break;
	};
}

/**
 * ibmvfc_reinit_host - Re-start host initialization (no NPIV Login)
 * @vhost:		ibmvfc host struct
 *
 * Return value:
 *	nothing
 **/
static void ibmvfc_reinit_host(struct ibmvfc_host *vhost)
{
	if (vhost->action == IBMVFC_HOST_ACTION_NONE) {
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		if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
			scsi_block_requests(vhost->host);
			ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
		}
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	} else
		vhost->reinit = 1;

	wake_up(&vhost->work_wait_q);
}

/**
 * ibmvfc_link_down - Handle a link down event from the adapter
 * @vhost:	ibmvfc host struct
 * @state:	ibmvfc host state to enter
 *
 **/
static void ibmvfc_link_down(struct ibmvfc_host *vhost,
			     enum ibmvfc_host_state state)
{
	struct ibmvfc_target *tgt;

	ENTER;
	scsi_block_requests(vhost->host);
	list_for_each_entry(tgt, &vhost->targets, queue)
		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
	ibmvfc_set_host_state(vhost, state);
	ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
	vhost->events_to_log |= IBMVFC_AE_LINKDOWN;
	wake_up(&vhost->work_wait_q);
	LEAVE;
}

/**
 * ibmvfc_init_host - Start host initialization
 * @vhost:		ibmvfc host struct
554
 * @relogin:	is this a re-login?
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 *
 * Return value:
 *	nothing
 **/
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static void ibmvfc_init_host(struct ibmvfc_host *vhost, int relogin)
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{
	struct ibmvfc_target *tgt;

	if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
564
		if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
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			dev_err(vhost->dev,
				"Host initialization retries exceeded. Taking adapter offline\n");
			ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
			return;
		}
	}

	if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
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		if (!relogin) {
			memset(vhost->async_crq.msgs, 0, PAGE_SIZE);
			vhost->async_crq.cur = 0;
		}

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		list_for_each_entry(tgt, &vhost->targets, queue)
			tgt->need_login = 1;
		scsi_block_requests(vhost->host);
		ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
		vhost->job_step = ibmvfc_npiv_login;
		wake_up(&vhost->work_wait_q);
	}
}

/**
 * ibmvfc_send_crq - Send a CRQ
 * @vhost:	ibmvfc host struct
 * @word1:	the first 64 bits of the data
 * @word2:	the second 64 bits of the data
 *
 * Return value:
 *	0 on success / other on failure
 **/
static int ibmvfc_send_crq(struct ibmvfc_host *vhost, u64 word1, u64 word2)
{
	struct vio_dev *vdev = to_vio_dev(vhost->dev);
	return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
}

/**
 * ibmvfc_send_crq_init - Send a CRQ init message
 * @vhost:	ibmvfc host struct
 *
 * Return value:
 *	0 on success / other on failure
 **/
static int ibmvfc_send_crq_init(struct ibmvfc_host *vhost)
{
	ibmvfc_dbg(vhost, "Sending CRQ init\n");
	return ibmvfc_send_crq(vhost, 0xC001000000000000LL, 0);
}

/**
 * ibmvfc_send_crq_init_complete - Send a CRQ init complete message
 * @vhost:	ibmvfc host struct
 *
 * Return value:
 *	0 on success / other on failure
 **/
static int ibmvfc_send_crq_init_complete(struct ibmvfc_host *vhost)
{
	ibmvfc_dbg(vhost, "Sending CRQ init complete\n");
	return ibmvfc_send_crq(vhost, 0xC002000000000000LL, 0);
}

/**
 * ibmvfc_release_crq_queue - Deallocates data and unregisters CRQ
 * @vhost:	ibmvfc host struct
 *
 * Frees irq, deallocates a page for messages, unmaps dma, and unregisters
 * the crq with the hypervisor.
 **/
static void ibmvfc_release_crq_queue(struct ibmvfc_host *vhost)
{
	long rc;
	struct vio_dev *vdev = to_vio_dev(vhost->dev);
	struct ibmvfc_crq_queue *crq = &vhost->crq;

	ibmvfc_dbg(vhost, "Releasing CRQ\n");
	free_irq(vdev->irq, vhost);
643
	tasklet_kill(&vhost->tasklet);
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	do {
		rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
	} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));

	vhost->state = IBMVFC_NO_CRQ;
	dma_unmap_single(vhost->dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
	free_page((unsigned long)crq->msgs);
}

/**
 * ibmvfc_reenable_crq_queue - reenables the CRQ
 * @vhost:	ibmvfc host struct
 *
 * Return value:
 *	0 on success / other on failure
 **/
static int ibmvfc_reenable_crq_queue(struct ibmvfc_host *vhost)
{
	int rc;
	struct vio_dev *vdev = to_vio_dev(vhost->dev);

	/* Re-enable the CRQ */
	do {
		rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
	} while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));

	if (rc)
		dev_err(vhost->dev, "Error enabling adapter (rc=%d)\n", rc);

	return rc;
}

/**
 * ibmvfc_reset_crq - resets a crq after a failure
 * @vhost:	ibmvfc host struct
 *
 * Return value:
 *	0 on success / other on failure
 **/
static int ibmvfc_reset_crq(struct ibmvfc_host *vhost)
{
	int rc;
	struct vio_dev *vdev = to_vio_dev(vhost->dev);
	struct ibmvfc_crq_queue *crq = &vhost->crq;

	/* Close the CRQ */
	do {
		rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
	} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));

	vhost->state = IBMVFC_NO_CRQ;
	ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);

	/* Clean out the queue */
	memset(crq->msgs, 0, PAGE_SIZE);
	crq->cur = 0;

	/* And re-open it again */
	rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
				crq->msg_token, PAGE_SIZE);

	if (rc == H_CLOSED)
		/* Adapter is good, but other end is not ready */
		dev_warn(vhost->dev, "Partner adapter not ready\n");
	else if (rc != 0)
		dev_warn(vhost->dev, "Couldn't register crq (rc=%d)\n", rc);

	return rc;
}

/**
 * ibmvfc_valid_event - Determines if event is valid.
 * @pool:	event_pool that contains the event
 * @evt:	ibmvfc event to be checked for validity
 *
 * Return value:
 *	1 if event is valid / 0 if event is not valid
 **/
static int ibmvfc_valid_event(struct ibmvfc_event_pool *pool,
			      struct ibmvfc_event *evt)
{
	int index = evt - pool->events;
	if (index < 0 || index >= pool->size)	/* outside of bounds */
		return 0;
	if (evt != pool->events + index)	/* unaligned */
		return 0;
	return 1;
}

/**
 * ibmvfc_free_event - Free the specified event
 * @evt:	ibmvfc_event to be freed
 *
 **/
static void ibmvfc_free_event(struct ibmvfc_event *evt)
{
	struct ibmvfc_host *vhost = evt->vhost;
	struct ibmvfc_event_pool *pool = &vhost->pool;

	BUG_ON(!ibmvfc_valid_event(pool, evt));
	BUG_ON(atomic_inc_return(&evt->free) != 1);
	list_add_tail(&evt->queue, &vhost->free);
}

/**
 * ibmvfc_scsi_eh_done - EH done function for queuecommand commands
 * @evt:	ibmvfc event struct
 *
 * This function does not setup any error status, that must be done
 * before this function gets called.
 **/
static void ibmvfc_scsi_eh_done(struct ibmvfc_event *evt)
{
	struct scsi_cmnd *cmnd = evt->cmnd;

	if (cmnd) {
		scsi_dma_unmap(cmnd);
		cmnd->scsi_done(cmnd);
	}

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	if (evt->eh_comp)
		complete(evt->eh_comp);

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	ibmvfc_free_event(evt);
}

/**
 * ibmvfc_fail_request - Fail request with specified error code
 * @evt:		ibmvfc event struct
 * @error_code:	error code to fail request with
 *
 * Return value:
 *	none
 **/
static void ibmvfc_fail_request(struct ibmvfc_event *evt, int error_code)
{
	if (evt->cmnd) {
		evt->cmnd->result = (error_code << 16);
		evt->done = ibmvfc_scsi_eh_done;
	} else
		evt->xfer_iu->mad_common.status = IBMVFC_MAD_DRIVER_FAILED;

	list_del(&evt->queue);
	del_timer(&evt->timer);
	ibmvfc_trc_end(evt);
	evt->done(evt);
}

/**
 * ibmvfc_purge_requests - Our virtual adapter just shut down. Purge any sent requests
 * @vhost:		ibmvfc host struct
 * @error_code:	error code to fail requests with
 *
 * Return value:
 *	none
 **/
static void ibmvfc_purge_requests(struct ibmvfc_host *vhost, int error_code)
{
	struct ibmvfc_event *evt, *pos;

	ibmvfc_dbg(vhost, "Purging all requests\n");
	list_for_each_entry_safe(evt, pos, &vhost->sent, queue)
		ibmvfc_fail_request(evt, error_code);
}

/**
 * __ibmvfc_reset_host - Reset the connection to the server (no locking)
 * @vhost:	struct ibmvfc host to reset
 **/
static void __ibmvfc_reset_host(struct ibmvfc_host *vhost)
{
	int rc;

	scsi_block_requests(vhost->host);
	ibmvfc_purge_requests(vhost, DID_ERROR);
	if ((rc = ibmvfc_reset_crq(vhost)) ||
	    (rc = ibmvfc_send_crq_init(vhost)) ||
	    (rc = vio_enable_interrupts(to_vio_dev(vhost->dev)))) {
		dev_err(vhost->dev, "Error after reset rc=%d\n", rc);
		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
	} else
		ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
}

/**
 * ibmvfc_reset_host - Reset the connection to the server
 * @vhost:	struct ibmvfc host to reset
 **/
static void ibmvfc_reset_host(struct ibmvfc_host *vhost)
{
	unsigned long flags;

	spin_lock_irqsave(vhost->host->host_lock, flags);
	__ibmvfc_reset_host(vhost);
	spin_unlock_irqrestore(vhost->host->host_lock, flags);
}

/**
 * ibmvfc_retry_host_init - Retry host initialization if allowed
 * @vhost:	ibmvfc host struct
 *
 **/
static void ibmvfc_retry_host_init(struct ibmvfc_host *vhost)
{
	if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
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		vhost->delay_init = 1;
		if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
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			dev_err(vhost->dev,
				"Host initialization retries exceeded. Taking adapter offline\n");
			ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
854
		} else if (vhost->init_retries == IBMVFC_MAX_HOST_INIT_RETRIES)
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			__ibmvfc_reset_host(vhost);
		else
			ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
	}

	wake_up(&vhost->work_wait_q);
}

/**
864
 * __ibmvfc_get_target - Find the specified scsi_target (no locking)
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 * @starget:	scsi target struct
 *
 * Return value:
 *	ibmvfc_target struct / NULL if not found
 **/
870
static struct ibmvfc_target *__ibmvfc_get_target(struct scsi_target *starget)
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{
	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
	struct ibmvfc_host *vhost = shost_priv(shost);
	struct ibmvfc_target *tgt;

	list_for_each_entry(tgt, &vhost->targets, queue)
877 878
		if (tgt->target_id == starget->id) {
			kref_get(&tgt->kref);
879
			return tgt;
880
		}
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	return NULL;
}

/**
885
 * ibmvfc_get_target - Find the specified scsi_target
886 887 888 889 890
 * @starget:	scsi target struct
 *
 * Return value:
 *	ibmvfc_target struct / NULL if not found
 **/
891
static struct ibmvfc_target *ibmvfc_get_target(struct scsi_target *starget)
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{
	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
	struct ibmvfc_target *tgt;
	unsigned long flags;

	spin_lock_irqsave(shost->host_lock, flags);
898
	tgt = __ibmvfc_get_target(starget);
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	spin_unlock_irqrestore(shost->host_lock, flags);
	return tgt;
}

/**
 * ibmvfc_get_host_speed - Get host port speed
 * @shost:		scsi host struct
 *
 * Return value:
 * 	none
 **/
static void ibmvfc_get_host_speed(struct Scsi_Host *shost)
{
	struct ibmvfc_host *vhost = shost_priv(shost);
	unsigned long flags;

	spin_lock_irqsave(shost->host_lock, flags);
	if (vhost->state == IBMVFC_ACTIVE) {
		switch (vhost->login_buf->resp.link_speed / 100) {
		case 1:
			fc_host_speed(shost) = FC_PORTSPEED_1GBIT;
			break;
		case 2:
			fc_host_speed(shost) = FC_PORTSPEED_2GBIT;
			break;
		case 4:
			fc_host_speed(shost) = FC_PORTSPEED_4GBIT;
			break;
		case 8:
			fc_host_speed(shost) = FC_PORTSPEED_8GBIT;
			break;
		case 10:
			fc_host_speed(shost) = FC_PORTSPEED_10GBIT;
			break;
		case 16:
			fc_host_speed(shost) = FC_PORTSPEED_16GBIT;
			break;
		default:
937
			ibmvfc_log(vhost, 3, "Unknown port speed: %lld Gbit\n",
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				   vhost->login_buf->resp.link_speed / 100);
			fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
			break;
		}
	} else
		fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
	spin_unlock_irqrestore(shost->host_lock, flags);
}

/**
 * ibmvfc_get_host_port_state - Get host port state
 * @shost:		scsi host struct
 *
 * Return value:
 * 	none
 **/
static void ibmvfc_get_host_port_state(struct Scsi_Host *shost)
{
	struct ibmvfc_host *vhost = shost_priv(shost);
	unsigned long flags;

	spin_lock_irqsave(shost->host_lock, flags);
	switch (vhost->state) {
	case IBMVFC_INITIALIZING:
	case IBMVFC_ACTIVE:
		fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
		break;
	case IBMVFC_LINK_DOWN:
		fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
		break;
	case IBMVFC_LINK_DEAD:
	case IBMVFC_HOST_OFFLINE:
		fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE;
		break;
	case IBMVFC_HALTED:
		fc_host_port_state(shost) = FC_PORTSTATE_BLOCKED;
		break;
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	case IBMVFC_NO_CRQ:
		fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
		break;
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	default:
		ibmvfc_log(vhost, 3, "Unknown port state: %d\n", vhost->state);
		fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
		break;
	}
	spin_unlock_irqrestore(shost->host_lock, flags);
}

/**
 * ibmvfc_set_rport_dev_loss_tmo - Set rport's device loss timeout
 * @rport:		rport struct
 * @timeout:	timeout value
 *
 * Return value:
 * 	none
 **/
static void ibmvfc_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
{
	if (timeout)
		rport->dev_loss_tmo = timeout;
	else
		rport->dev_loss_tmo = 1;
}

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/**
 * ibmvfc_release_tgt - Free memory allocated for a target
 * @kref:		kref struct
 *
 **/
static void ibmvfc_release_tgt(struct kref *kref)
{
	struct ibmvfc_target *tgt = container_of(kref, struct ibmvfc_target, kref);
	kfree(tgt);
}

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/**
 * ibmvfc_get_starget_node_name - Get SCSI target's node name
 * @starget:	scsi target struct
 *
 * Return value:
 * 	none
 **/
static void ibmvfc_get_starget_node_name(struct scsi_target *starget)
{
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	struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1023
	fc_starget_port_name(starget) = tgt ? tgt->ids.node_name : 0;
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	if (tgt)
		kref_put(&tgt->kref, ibmvfc_release_tgt);
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}

/**
 * ibmvfc_get_starget_port_name - Get SCSI target's port name
 * @starget:	scsi target struct
 *
 * Return value:
 * 	none
 **/
static void ibmvfc_get_starget_port_name(struct scsi_target *starget)
{
1037
	struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1038
	fc_starget_port_name(starget) = tgt ? tgt->ids.port_name : 0;
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	if (tgt)
		kref_put(&tgt->kref, ibmvfc_release_tgt);
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}

/**
 * ibmvfc_get_starget_port_id - Get SCSI target's port ID
 * @starget:	scsi target struct
 *
 * Return value:
 * 	none
 **/
static void ibmvfc_get_starget_port_id(struct scsi_target *starget)
{
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	struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1053
	fc_starget_port_id(starget) = tgt ? tgt->scsi_id : -1;
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	if (tgt)
		kref_put(&tgt->kref, ibmvfc_release_tgt);
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}

/**
 * ibmvfc_wait_while_resetting - Wait while the host resets
 * @vhost:		ibmvfc host struct
 *
 * Return value:
 * 	0 on success / other on failure
 **/
static int ibmvfc_wait_while_resetting(struct ibmvfc_host *vhost)
{
	long timeout = wait_event_timeout(vhost->init_wait_q,
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					  ((vhost->state == IBMVFC_ACTIVE ||
					    vhost->state == IBMVFC_HOST_OFFLINE ||
					    vhost->state == IBMVFC_LINK_DEAD) &&
					   vhost->action == IBMVFC_HOST_ACTION_NONE),
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					  (init_timeout * HZ));

	return timeout ? 0 : -EIO;
}

/**
 * ibmvfc_issue_fc_host_lip - Re-initiate link initialization
 * @shost:		scsi host struct
 *
 * Return value:
 * 	0 on success / other on failure
 **/
static int ibmvfc_issue_fc_host_lip(struct Scsi_Host *shost)
{
	struct ibmvfc_host *vhost = shost_priv(shost);

	dev_err(vhost->dev, "Initiating host LIP. Resetting connection\n");
	ibmvfc_reset_host(vhost);
	return ibmvfc_wait_while_resetting(vhost);
}

/**
 * ibmvfc_gather_partition_info - Gather info about the LPAR
 *
 * Return value:
 *	none
 **/
static void ibmvfc_gather_partition_info(struct ibmvfc_host *vhost)
{
	struct device_node *rootdn;
	const char *name;
	const unsigned int *num;

	rootdn = of_find_node_by_path("/");
	if (!rootdn)
		return;

	name = of_get_property(rootdn, "ibm,partition-name", NULL);
	if (name)
		strncpy(vhost->partition_name, name, sizeof(vhost->partition_name));
	num = of_get_property(rootdn, "ibm,partition-no", NULL);
	if (num)
		vhost->partition_number = *num;
	of_node_put(rootdn);
}

/**
 * ibmvfc_set_login_info - Setup info for NPIV login
 * @vhost:	ibmvfc host struct
 *
 * Return value:
 *	none
 **/
static void ibmvfc_set_login_info(struct ibmvfc_host *vhost)
{
	struct ibmvfc_npiv_login *login_info = &vhost->login_info;
	struct device_node *of_node = vhost->dev->archdata.of_node;
	const char *location;

	memset(login_info, 0, sizeof(*login_info));

	login_info->ostype = IBMVFC_OS_LINUX;
	login_info->max_dma_len = IBMVFC_MAX_SECTORS << 9;
	login_info->max_payload = sizeof(struct ibmvfc_fcp_cmd_iu);
	login_info->max_response = sizeof(struct ibmvfc_fcp_rsp);
	login_info->partition_num = vhost->partition_number;
	login_info->vfc_frame_version = 1;
	login_info->fcp_version = 3;
	if (vhost->client_migrated)
		login_info->flags = IBMVFC_CLIENT_MIGRATED;

	login_info->max_cmds = max_requests + IBMVFC_NUM_INTERNAL_REQ;
	login_info->capabilities = IBMVFC_CAN_MIGRATE;
	login_info->async.va = vhost->async_crq.msg_token;
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	login_info->async.len = vhost->async_crq.size * sizeof(*vhost->async_crq.msgs);
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	strncpy(login_info->partition_name, vhost->partition_name, IBMVFC_MAX_NAME);
	strncpy(login_info->device_name,
1149
		dev_name(&vhost->host->shost_gendev), IBMVFC_MAX_NAME);
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	location = of_get_property(of_node, "ibm,loc-code", NULL);
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	location = location ? location : dev_name(vhost->dev);
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	strncpy(login_info->drc_name, location, IBMVFC_MAX_NAME);
}

/**
 * ibmvfc_init_event_pool - Allocates and initializes the event pool for a host
 * @vhost:	ibmvfc host who owns the event pool
 *
 * Returns zero on success.
 **/
static int ibmvfc_init_event_pool(struct ibmvfc_host *vhost)
{
	int i;
	struct ibmvfc_event_pool *pool = &vhost->pool;

	ENTER;
	pool->size = max_requests + IBMVFC_NUM_INTERNAL_REQ;
	pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);
	if (!pool->events)
		return -ENOMEM;

	pool->iu_storage = dma_alloc_coherent(vhost->dev,
					      pool->size * sizeof(*pool->iu_storage),
					      &pool->iu_token, 0);

	if (!pool->iu_storage) {
		kfree(pool->events);
		return -ENOMEM;
	}

	for (i = 0; i < pool->size; ++i) {
		struct ibmvfc_event *evt = &pool->events[i];
		atomic_set(&evt->free, 1);
		evt->crq.valid = 0x80;
		evt->crq.ioba = pool->iu_token + (sizeof(*evt->xfer_iu) * i);
		evt->xfer_iu = pool->iu_storage + i;
		evt->vhost = vhost;
		evt->ext_list = NULL;
		list_add_tail(&evt->queue, &vhost->free);
	}

	LEAVE;
	return 0;
}

/**
 * ibmvfc_free_event_pool - Frees memory of the event pool of a host
 * @vhost:	ibmvfc host who owns the event pool
 *
 **/
static void ibmvfc_free_event_pool(struct ibmvfc_host *vhost)
{
	int i;
	struct ibmvfc_event_pool *pool = &vhost->pool;

	ENTER;
	for (i = 0; i < pool->size; ++i) {
		list_del(&pool->events[i].queue);
		BUG_ON(atomic_read(&pool->events[i].free) != 1);
		if (pool->events[i].ext_list)
			dma_pool_free(vhost->sg_pool,
				      pool->events[i].ext_list,
				      pool->events[i].ext_list_token);
	}

	kfree(pool->events);
	dma_free_coherent(vhost->dev,
			  pool->size * sizeof(*pool->iu_storage),
			  pool->iu_storage, pool->iu_token);
	LEAVE;
}

/**
 * ibmvfc_get_event - Gets the next free event in pool
 * @vhost:	ibmvfc host struct
 *
 * Returns a free event from the pool.
 **/
static struct ibmvfc_event *ibmvfc_get_event(struct ibmvfc_host *vhost)
{
	struct ibmvfc_event *evt;

	BUG_ON(list_empty(&vhost->free));
	evt = list_entry(vhost->free.next, struct ibmvfc_event, queue);
	atomic_set(&evt->free, 0);
	list_del(&evt->queue);
	return evt;
}

/**
 * ibmvfc_init_event - Initialize fields in an event struct that are always
 *				required.
 * @evt:	The event
 * @done:	Routine to call when the event is responded to
 * @format:	SRP or MAD format
 **/
static void ibmvfc_init_event(struct ibmvfc_event *evt,
			      void (*done) (struct ibmvfc_event *), u8 format)
{
	evt->cmnd = NULL;
	evt->sync_iu = NULL;
	evt->crq.format = format;
	evt->done = done;
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	evt->eh_comp = NULL;
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}

/**
 * ibmvfc_map_sg_list - Initialize scatterlist
 * @scmd:	scsi command struct
 * @nseg:	number of scatterlist segments
 * @md:	memory descriptor list to initialize
 **/
static void ibmvfc_map_sg_list(struct scsi_cmnd *scmd, int nseg,
			       struct srp_direct_buf *md)
{
	int i;
	struct scatterlist *sg;

	scsi_for_each_sg(scmd, sg, nseg, i) {
		md[i].va = sg_dma_address(sg);
		md[i].len = sg_dma_len(sg);
		md[i].key = 0;
	}
}

/**
 * ibmvfc_map_sg_data - Maps dma for a scatterlist and initializes decriptor fields
 * @scmd:		Scsi_Cmnd with the scatterlist
 * @evt:		ibmvfc event struct
 * @vfc_cmd:	vfc_cmd that contains the memory descriptor
 * @dev:		device for which to map dma memory
 *
 * Returns:
 *	0 on success / non-zero on failure
 **/
static int ibmvfc_map_sg_data(struct scsi_cmnd *scmd,
			      struct ibmvfc_event *evt,
			      struct ibmvfc_cmd *vfc_cmd, struct device *dev)
{

	int sg_mapped;
	struct srp_direct_buf *data = &vfc_cmd->ioba;
	struct ibmvfc_host *vhost = dev_get_drvdata(dev);

	sg_mapped = scsi_dma_map(scmd);
	if (!sg_mapped) {
		vfc_cmd->flags |= IBMVFC_NO_MEM_DESC;
		return 0;
	} else if (unlikely(sg_mapped < 0)) {
		if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
			scmd_printk(KERN_ERR, scmd, "Failed to map DMA buffer for command\n");
		return sg_mapped;
	}

	if (scmd->sc_data_direction == DMA_TO_DEVICE) {
		vfc_cmd->flags |= IBMVFC_WRITE;
		vfc_cmd->iu.add_cdb_len |= IBMVFC_WRDATA;
	} else {
		vfc_cmd->flags |= IBMVFC_READ;
		vfc_cmd->iu.add_cdb_len |= IBMVFC_RDDATA;
	}

	if (sg_mapped == 1) {
		ibmvfc_map_sg_list(scmd, sg_mapped, data);
		return 0;
	}

	vfc_cmd->flags |= IBMVFC_SCATTERLIST;

	if (!evt->ext_list) {
		evt->ext_list = dma_pool_alloc(vhost->sg_pool, GFP_ATOMIC,
					       &evt->ext_list_token);

		if (!evt->ext_list) {
1326 1327 1328
			scsi_dma_unmap(scmd);
			if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
				scmd_printk(KERN_ERR, scmd, "Can't allocate memory for scatterlist\n");
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			return -ENOMEM;
		}
	}

	ibmvfc_map_sg_list(scmd, sg_mapped, evt->ext_list);

	data->va = evt->ext_list_token;
	data->len = sg_mapped * sizeof(struct srp_direct_buf);
	data->key = 0;
	return 0;
}

/**
 * ibmvfc_timeout - Internal command timeout handler
 * @evt:	struct ibmvfc_event that timed out
 *
 * Called when an internally generated command times out
 **/
static void ibmvfc_timeout(struct ibmvfc_event *evt)
{
	struct ibmvfc_host *vhost = evt->vhost;
	dev_err(vhost->dev, "Command timed out (%p). Resetting connection\n", evt);
	ibmvfc_reset_host(vhost);
}

/**
 * ibmvfc_send_event - Transforms event to u64 array and calls send_crq()
 * @evt:		event to be sent
 * @vhost:		ibmvfc host struct
 * @timeout:	timeout in seconds - 0 means do not time command
 *
 * Returns the value returned from ibmvfc_send_crq(). (Zero for success)
 **/
static int ibmvfc_send_event(struct ibmvfc_event *evt,
			     struct ibmvfc_host *vhost, unsigned long timeout)
{
	u64 *crq_as_u64 = (u64 *) &evt->crq;
	int rc;

	/* Copy the IU into the transfer area */
	*evt->xfer_iu = evt->iu;
	if (evt->crq.format == IBMVFC_CMD_FORMAT)
		evt->xfer_iu->cmd.tag = (u64)evt;
	else if (evt->crq.format == IBMVFC_MAD_FORMAT)
		evt->xfer_iu->mad_common.tag = (u64)evt;
	else
		BUG();

	list_add_tail(&evt->queue, &vhost->sent);
	init_timer(&evt->timer);

	if (timeout) {
		evt->timer.data = (unsigned long) evt;
		evt->timer.expires = jiffies + (timeout * HZ);
		evt->timer.function = (void (*)(unsigned long))ibmvfc_timeout;
		add_timer(&evt->timer);
	}

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	mb();

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	if ((rc = ibmvfc_send_crq(vhost, crq_as_u64[0], crq_as_u64[1]))) {
		list_del(&evt->queue);
		del_timer(&evt->timer);

		/* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
		 * Firmware will send a CRQ with a transport event (0xFF) to
		 * tell this client what has happened to the transport. This
		 * will be handled in ibmvfc_handle_crq()
		 */
		if (rc == H_CLOSED) {
			if (printk_ratelimit())
				dev_warn(vhost->dev, "Send warning. Receive queue closed, will retry.\n");
			if (evt->cmnd)
				scsi_dma_unmap(evt->cmnd);
			ibmvfc_free_event(evt);
			return SCSI_MLQUEUE_HOST_BUSY;
		}

		dev_err(vhost->dev, "Send error (rc=%d)\n", rc);
		if (evt->cmnd) {
			evt->cmnd->result = DID_ERROR << 16;
			evt->done = ibmvfc_scsi_eh_done;
		} else
			evt->xfer_iu->mad_common.status = IBMVFC_MAD_CRQ_ERROR;

		evt->done(evt);
	} else
		ibmvfc_trc_start(evt);

	return 0;
}

/**
 * ibmvfc_log_error - Log an error for the failed command if appropriate
 * @evt:	ibmvfc event to log
 *
 **/
static void ibmvfc_log_error(struct ibmvfc_event *evt)
{
	struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
	struct ibmvfc_host *vhost = evt->vhost;
	struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
	struct scsi_cmnd *cmnd = evt->cmnd;
	const char *err = unknown_error;
	int index = ibmvfc_get_err_index(vfc_cmd->status, vfc_cmd->error);
	int logerr = 0;
	int rsp_code = 0;

	if (index >= 0) {
		logerr = cmd_status[index].log;
		err = cmd_status[index].name;
	}

1442
	if (!logerr && (vhost->log_level <= (IBMVFC_DEFAULT_LOG_LEVEL + 1)))
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		return;

	if (rsp->flags & FCP_RSP_LEN_VALID)
		rsp_code = rsp->data.info.rsp_code;

	scmd_printk(KERN_ERR, cmnd, "Command (%02X) failed: %s (%x:%x) "
		    "flags: %x fcp_rsp: %x, resid=%d, scsi_status: %x\n",
		    cmnd->cmnd[0], err, vfc_cmd->status, vfc_cmd->error,
		    rsp->flags, rsp_code, scsi_get_resid(cmnd), rsp->scsi_status);
}

/**
 * ibmvfc_scsi_done - Handle responses from commands
 * @evt:	ibmvfc event to be handled
 *
 * Used as a callback when sending scsi cmds.
 **/
static void ibmvfc_scsi_done(struct ibmvfc_event *evt)
{
	struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
	struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
	struct scsi_cmnd *cmnd = evt->cmnd;
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	u32 rsp_len = 0;
	u32 sense_len = rsp->fcp_sense_len;
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	if (cmnd) {
		if (vfc_cmd->response_flags & IBMVFC_ADAPTER_RESID_VALID)
			scsi_set_resid(cmnd, vfc_cmd->adapter_resid);
		else if (rsp->flags & FCP_RESID_UNDER)
			scsi_set_resid(cmnd, rsp->fcp_resid);
		else
			scsi_set_resid(cmnd, 0);

		if (vfc_cmd->status) {
			cmnd->result = ibmvfc_get_err_result(vfc_cmd);

			if (rsp->flags & FCP_RSP_LEN_VALID)
				rsp_len = rsp->fcp_rsp_len;
			if ((sense_len + rsp_len) > SCSI_SENSE_BUFFERSIZE)
				sense_len = SCSI_SENSE_BUFFERSIZE - rsp_len;
1483
			if ((rsp->flags & FCP_SNS_LEN_VALID) && rsp->fcp_sense_len && rsp_len <= 8)
1484
				memcpy(cmnd->sense_buffer, rsp->data.sense + rsp_len, sense_len);
1485 1486
			if ((vfc_cmd->status & IBMVFC_VIOS_FAILURE) && (vfc_cmd->error == IBMVFC_PLOGI_REQUIRED))
				ibmvfc_reinit_host(evt->vhost);
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			if (!cmnd->result && (!scsi_get_resid(cmnd) || (rsp->flags & FCP_RESID_OVER)))
				cmnd->result = (DID_ERROR << 16);

1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501
			ibmvfc_log_error(evt);
		}

		if (!cmnd->result &&
		    (scsi_bufflen(cmnd) - scsi_get_resid(cmnd) < cmnd->underflow))
			cmnd->result = (DID_ERROR << 16);

		scsi_dma_unmap(cmnd);
		cmnd->scsi_done(cmnd);
	}

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	if (evt->eh_comp)
		complete(evt->eh_comp);

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	ibmvfc_free_event(evt);
}

/**
 * ibmvfc_host_chkready - Check if the host can accept commands
 * @vhost:	 struct ibmvfc host
 *
 * Returns:
 *	1 if host can accept command / 0 if not
 **/
static inline int ibmvfc_host_chkready(struct ibmvfc_host *vhost)
{
	int result = 0;

	switch (vhost->state) {
	case IBMVFC_LINK_DEAD:
	case IBMVFC_HOST_OFFLINE:
		result = DID_NO_CONNECT << 16;
		break;
	case IBMVFC_NO_CRQ:
	case IBMVFC_INITIALIZING:
	case IBMVFC_HALTED:
	case IBMVFC_LINK_DOWN:
		result = DID_REQUEUE << 16;
		break;
	case IBMVFC_ACTIVE:
		result = 0;
		break;
	};

	return result;
}

/**
 * ibmvfc_queuecommand - The queuecommand function of the scsi template
 * @cmnd:	struct scsi_cmnd to be executed
 * @done:	Callback function to be called when cmnd is completed
 *
 * Returns:
 *	0 on success / other on failure
 **/
static int ibmvfc_queuecommand(struct scsi_cmnd *cmnd,
			       void (*done) (struct scsi_cmnd *))
{
	struct ibmvfc_host *vhost = shost_priv(cmnd->device->host);
	struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
	struct ibmvfc_cmd *vfc_cmd;
	struct ibmvfc_event *evt;
	u8 tag[2];
	int rc;

	if (unlikely((rc = fc_remote_port_chkready(rport))) ||
	    unlikely((rc = ibmvfc_host_chkready(vhost)))) {
		cmnd->result = rc;
		done(cmnd);
		return 0;
	}

	cmnd->result = (DID_OK << 16);
	evt = ibmvfc_get_event(vhost);
	ibmvfc_init_event(evt, ibmvfc_scsi_done, IBMVFC_CMD_FORMAT);
	evt->cmnd = cmnd;
	cmnd->scsi_done = done;
	vfc_cmd = &evt->iu.cmd;
	memset(vfc_cmd, 0, sizeof(*vfc_cmd));
	vfc_cmd->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp);
	vfc_cmd->resp.len = sizeof(vfc_cmd->rsp);
	vfc_cmd->frame_type = IBMVFC_SCSI_FCP_TYPE;
	vfc_cmd->payload_len = sizeof(vfc_cmd->iu);
	vfc_cmd->resp_len = sizeof(vfc_cmd->rsp);
	vfc_cmd->cancel_key = (unsigned long)cmnd->device->hostdata;
	vfc_cmd->tgt_scsi_id = rport->port_id;
	vfc_cmd->iu.xfer_len = scsi_bufflen(cmnd);
	int_to_scsilun(cmnd->device->lun, &vfc_cmd->iu.lun);
	memcpy(vfc_cmd->iu.cdb, cmnd->cmnd, cmnd->cmd_len);

	if (scsi_populate_tag_msg(cmnd, tag)) {
		vfc_cmd->task_tag = tag[1];
		switch (tag[0]) {
		case MSG_SIMPLE_TAG:
			vfc_cmd->iu.pri_task_attr = IBMVFC_SIMPLE_TASK;
			break;
		case MSG_HEAD_TAG:
			vfc_cmd->iu.pri_task_attr = IBMVFC_HEAD_OF_QUEUE;
			break;
		case MSG_ORDERED_TAG:
			vfc_cmd->iu.pri_task_attr = IBMVFC_ORDERED_TASK;
			break;
		};
	}

	if (likely(!(rc = ibmvfc_map_sg_data(cmnd, evt, vfc_cmd, vhost->dev))))
		return ibmvfc_send_event(evt, vhost, 0);

	ibmvfc_free_event(evt);
	if (rc == -ENOMEM)
		return SCSI_MLQUEUE_HOST_BUSY;

	if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
		scmd_printk(KERN_ERR, cmnd,
			    "Failed to map DMA buffer for command. rc=%d\n", rc);

	cmnd->result = DID_ERROR << 16;
	done(cmnd);
	return 0;
}

/**
 * ibmvfc_sync_completion - Signal that a synchronous command has completed
 * @evt:	ibmvfc event struct
 *
 **/
static void ibmvfc_sync_completion(struct ibmvfc_event *evt)
{
	/* copy the response back */
	if (evt->sync_iu)
		*evt->sync_iu = *evt->xfer_iu;

	complete(&evt->comp);
}

/**
 * ibmvfc_reset_device - Reset the device with the specified reset type
 * @sdev:	scsi device to reset
 * @type:	reset type
 * @desc:	reset type description for log messages
 *
 * Returns:
 *	0 on success / other on failure
 **/
static int ibmvfc_reset_device(struct scsi_device *sdev, int type, char *desc)
{
	struct ibmvfc_host *vhost = shost_priv(sdev->host);
	struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
	struct ibmvfc_cmd *tmf;
1640
	struct ibmvfc_event *evt = NULL;
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	union ibmvfc_iu rsp_iu;
	struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
	int rsp_rc = -EBUSY;
	unsigned long flags;
	int rsp_code = 0;

	spin_lock_irqsave(vhost->host->host_lock, flags);
	if (vhost->state == IBMVFC_ACTIVE) {
		evt = ibmvfc_get_event(vhost);
		ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);

		tmf = &evt->iu.cmd;
		memset(tmf, 0, sizeof(*tmf));
		tmf->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp);
		tmf->resp.len = sizeof(tmf->rsp);
		tmf->frame_type = IBMVFC_SCSI_FCP_TYPE;
		tmf->payload_len = sizeof(tmf->iu);
		tmf->resp_len = sizeof(tmf->rsp);
		tmf->cancel_key = (unsigned long)sdev->hostdata;
		tmf->tgt_scsi_id = rport->port_id;
		int_to_scsilun(sdev->lun, &tmf->iu.lun);
		tmf->flags = (IBMVFC_NO_MEM_DESC | IBMVFC_TMF);
		tmf->iu.tmf_flags = type;
		evt->sync_iu = &rsp_iu;

		init_completion(&evt->comp);
		rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
	}
	spin_unlock_irqrestore(vhost->host->host_lock, flags);

	if (rsp_rc != 0) {
		sdev_printk(KERN_ERR, sdev, "Failed to send %s reset event. rc=%d\n",
			    desc, rsp_rc);
		return -EIO;
	}

	sdev_printk(KERN_INFO, sdev, "Resetting %s\n", desc);
	wait_for_completion(&evt->comp);

	if (rsp_iu.cmd.status) {
		if (fc_rsp->flags & FCP_RSP_LEN_VALID)
			rsp_code = fc_rsp->data.info.rsp_code;

		sdev_printk(KERN_ERR, sdev, "%s reset failed: %s (%x:%x) "
			    "flags: %x fcp_rsp: %x, scsi_status: %x\n",
			    desc, ibmvfc_get_cmd_error(rsp_iu.cmd.status, rsp_iu.cmd.error),
			    rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code,
			    fc_rsp->scsi_status);
		rsp_rc = -EIO;
	} else
		sdev_printk(KERN_INFO, sdev, "%s reset successful\n", desc);

	spin_lock_irqsave(vhost->host->host_lock, flags);
	ibmvfc_free_event(evt);
	spin_unlock_irqrestore(vhost->host->host_lock, flags);
	return rsp_rc;
}

/**
 * ibmvfc_abort_task_set - Abort outstanding commands to the device
 * @sdev:	scsi device to abort commands
 *
 * This sends an Abort Task Set to the VIOS for the specified device. This does
 * NOT send any cancel to the VIOS. That must be done separately.
 *
 * Returns:
 *	0 on success / other on failure
 **/
static int ibmvfc_abort_task_set(struct scsi_device *sdev)
{
	struct ibmvfc_host *vhost = shost_priv(sdev->host);
	struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
	struct ibmvfc_cmd *tmf;
	struct ibmvfc_event *evt, *found_evt;
	union ibmvfc_iu rsp_iu;
	struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
	int rsp_rc = -EBUSY;
	unsigned long flags;
	int rsp_code = 0;

	spin_lock_irqsave(vhost->host->host_lock, flags);
	found_evt = NULL;
	list_for_each_entry(evt, &vhost->sent, queue) {
		if (evt->cmnd && evt->cmnd->device == sdev) {
			found_evt = evt;
			break;
		}
	}

	if (!found_evt) {
		if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
			sdev_printk(KERN_INFO, sdev, "No events found to abort\n");
		spin_unlock_irqrestore(vhost->host->host_lock, flags);
		return 0;
	}

	if (vhost->state == IBMVFC_ACTIVE) {
		evt = ibmvfc_get_event(vhost);
		ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);

		tmf = &evt->iu.cmd;
		memset(tmf, 0, sizeof(*tmf));
		tmf->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp);
		tmf->resp.len = sizeof(tmf->rsp);
		tmf->frame_type = IBMVFC_SCSI_FCP_TYPE;
		tmf->payload_len = sizeof(tmf->iu);
		tmf->resp_len = sizeof(tmf->rsp);
		tmf->cancel_key = (unsigned long)sdev->hostdata;
		tmf->tgt_scsi_id = rport->port_id;
		int_to_scsilun(sdev->lun, &tmf->iu.lun);
		tmf->flags = (IBMVFC_NO_MEM_DESC | IBMVFC_TMF);
		tmf->iu.tmf_flags = IBMVFC_ABORT_TASK_SET;
		evt->sync_iu = &rsp_iu;

		init_completion(&evt->comp);
		rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
	}

	spin_unlock_irqrestore(vhost->host->host_lock, flags);

	if (rsp_rc != 0) {
		sdev_printk(KERN_ERR, sdev, "Failed to send abort. rc=%d\n", rsp_rc);
		return -EIO;
	}

	sdev_printk(KERN_INFO, sdev, "Aborting outstanding commands\n");
	wait_for_completion(&evt->comp);

	if (rsp_iu.cmd.status) {
		if (fc_rsp->flags & FCP_RSP_LEN_VALID)
			rsp_code = fc_rsp->data.info.rsp_code;

		sdev_printk(KERN_ERR, sdev, "Abort failed: %s (%x:%x) "
			    "flags: %x fcp_rsp: %x, scsi_status: %x\n",
			    ibmvfc_get_cmd_error(rsp_iu.cmd.status, rsp_iu.cmd.error),
			    rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code,
			    fc_rsp->scsi_status);
		rsp_rc = -EIO;
	} else
		sdev_printk(KERN_INFO, sdev, "Abort successful\n");

	spin_lock_irqsave(vhost->host->host_lock, flags);
	ibmvfc_free_event(evt);
	spin_unlock_irqrestore(vhost->host->host_lock, flags);
	return rsp_rc;
}

/**
 * ibmvfc_cancel_all - Cancel all outstanding commands to the device
 * @sdev:	scsi device to cancel commands
 * @type:	type of error recovery being performed
 *
 * This sends a cancel to the VIOS for the specified device. This does
 * NOT send any abort to the actual device. That must be done separately.
 *
 * Returns:
 *	0 on success / other on failure
 **/
static int ibmvfc_cancel_all(struct scsi_device *sdev, int type)
{
	struct ibmvfc_host *vhost = shost_priv(sdev->host);
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	struct scsi_target *starget = scsi_target(sdev);
	struct fc_rport *rport = starget_to_rport(starget);
1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840
	struct ibmvfc_tmf *tmf;
	struct ibmvfc_event *evt, *found_evt;
	union ibmvfc_iu rsp;
	int rsp_rc = -EBUSY;
	unsigned long flags;
	u16 status;

	ENTER;
	spin_lock_irqsave(vhost->host->host_lock, flags);
	found_evt = NULL;
	list_for_each_entry(evt, &vhost->sent, queue) {
		if (evt->cmnd && evt->cmnd->device == sdev) {
			found_evt = evt;
			break;
		}
	}

	if (!found_evt) {
		if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
			sdev_printk(KERN_INFO, sdev, "No events found to cancel\n");
		spin_unlock_irqrestore(vhost->host->host_lock, flags);
		return 0;
	}

	if (vhost->state == IBMVFC_ACTIVE) {
		evt = ibmvfc_get_event(vhost);
		ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);

		tmf = &evt->iu.tmf;
		memset(tmf, 0, sizeof(*tmf));
		tmf->common.version = 1;
		tmf->common.opcode = IBMVFC_TMF_MAD;
		tmf->common.length = sizeof(*tmf);
		tmf->scsi_id = rport->port_id;
		int_to_scsilun(sdev->lun, &tmf->lun);
		tmf->flags = (type | IBMVFC_TMF_LUA_VALID);
		tmf->cancel_key = (unsigned long)sdev->hostdata;
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		tmf->my_cancel_key = (unsigned long)starget->hostdata;
1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871

		evt->sync_iu = &rsp;
		init_completion(&evt->comp);
		rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
	}

	spin_unlock_irqrestore(vhost->host->host_lock, flags);

	if (rsp_rc != 0) {
		sdev_printk(KERN_ERR, sdev, "Failed to send cancel event. rc=%d\n", rsp_rc);
		return -EIO;
	}

	sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n");

	wait_for_completion(&evt->comp);
	status = rsp.mad_common.status;
	spin_lock_irqsave(vhost->host->host_lock, flags);
	ibmvfc_free_event(evt);
	spin_unlock_irqrestore(vhost->host->host_lock, flags);

	if (status != IBMVFC_MAD_SUCCESS) {
		sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status);
		return -EIO;
	}

	sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n");
	return 0;
}

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1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956
/**
 * ibmvfc_match_target - Match function for specified target
 * @evt:	ibmvfc event struct
 * @device:	device to match (starget)
 *
 * Returns:
 *	1 if event matches starget / 0 if event does not match starget
 **/
static int ibmvfc_match_target(struct ibmvfc_event *evt, void *device)
{
	if (evt->cmnd && scsi_target(evt->cmnd->device) == device)
		return 1;
	return 0;
}

/**
 * ibmvfc_match_lun - Match function for specified LUN
 * @evt:	ibmvfc event struct
 * @device:	device to match (sdev)
 *
 * Returns:
 *	1 if event matches sdev / 0 if event does not match sdev
 **/
static int ibmvfc_match_lun(struct ibmvfc_event *evt, void *device)
{
	if (evt->cmnd && evt->cmnd->device == device)
		return 1;
	return 0;
}

/**
 * ibmvfc_wait_for_ops - Wait for ops to complete
 * @vhost:	ibmvfc host struct
 * @device:	device to match (starget or sdev)
 * @match:	match function
 *
 * Returns:
 *	SUCCESS / FAILED
 **/
static int ibmvfc_wait_for_ops(struct ibmvfc_host *vhost, void *device,
			       int (*match) (struct ibmvfc_event *, void *))
{
	struct ibmvfc_event *evt;
	DECLARE_COMPLETION_ONSTACK(comp);
	int wait;
	unsigned long flags;
	signed long timeout = init_timeout * HZ;

	ENTER;
	do {
		wait = 0;
		spin_lock_irqsave(vhost->host->host_lock, flags);
		list_for_each_entry(evt, &vhost->sent, queue) {
			if (match(evt, device)) {
				evt->eh_comp = &comp;
				wait++;
			}
		}
		spin_unlock_irqrestore(vhost->host->host_lock, flags);

		if (wait) {
			timeout = wait_for_completion_timeout(&comp, timeout);

			if (!timeout) {
				wait = 0;
				spin_lock_irqsave(vhost->host->host_lock, flags);
				list_for_each_entry(evt, &vhost->sent, queue) {
					if (match(evt, device)) {
						evt->eh_comp = NULL;
						wait++;
					}
				}
				spin_unlock_irqrestore(vhost->host->host_lock, flags);
				if (wait)
					dev_err(vhost->dev, "Timed out waiting for aborted commands\n");
				LEAVE;
				return wait ? FAILED : SUCCESS;
			}
		}
	} while (wait);

	LEAVE;
	return SUCCESS;
}

1957 1958 1959 1960 1961 1962 1963 1964 1965
/**
 * ibmvfc_eh_abort_handler - Abort a command
 * @cmd:	scsi command to abort
 *
 * Returns:
 *	SUCCESS / FAILED
 **/
static int ibmvfc_eh_abort_handler(struct scsi_cmnd *cmd)
{
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	struct scsi_device *sdev = cmd->device;
	struct ibmvfc_host *vhost = shost_priv(sdev->host);
1968
	int cancel_rc, abort_rc;
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	int rc = FAILED;
1970 1971 1972

	ENTER;
	ibmvfc_wait_while_resetting(vhost);
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	cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET);
	abort_rc = ibmvfc_abort_task_set(sdev);
1975

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	if (!cancel_rc && !abort_rc)
		rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
1978 1979

	LEAVE;
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	return rc;
1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991
}

/**
 * ibmvfc_eh_device_reset_handler - Reset a single LUN
 * @cmd:	scsi command struct
 *
 * Returns:
 *	SUCCESS / FAILED
 **/
static int ibmvfc_eh_device_reset_handler(struct scsi_cmnd *cmd)
{
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	struct scsi_device *sdev = cmd->device;
	struct ibmvfc_host *vhost = shost_priv(sdev->host);
1994
	int cancel_rc, reset_rc;
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	int rc = FAILED;
1996 1997 1998

	ENTER;
	ibmvfc_wait_while_resetting(vhost);
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	cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_LUN_RESET);
	reset_rc = ibmvfc_reset_device(sdev, IBMVFC_LUN_RESET, "LUN");
2001

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	if (!cancel_rc && !reset_rc)
		rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2004 2005

	LEAVE;
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	return rc;
2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041
}

/**
 * ibmvfc_dev_cancel_all - Device iterated cancel all function
 * @sdev:	scsi device struct
 * @data:	return code
 *
 **/
static void ibmvfc_dev_cancel_all(struct scsi_device *sdev, void *data)
{
	unsigned long *rc = data;
	*rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_TGT_RESET);
}

/**
 * ibmvfc_dev_abort_all - Device iterated abort task set function
 * @sdev:	scsi device struct
 * @data:	return code
 *
 **/
static void ibmvfc_dev_abort_all(struct scsi_device *sdev, void *data)
{
	unsigned long *rc = data;
	*rc |= ibmvfc_abort_task_set(sdev);
}

/**
 * ibmvfc_eh_target_reset_handler - Reset the target
 * @cmd:	scsi command struct
 *
 * Returns:
 *	SUCCESS / FAILED
 **/
static int ibmvfc_eh_target_reset_handler(struct scsi_cmnd *cmd)
{
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	struct scsi_device *sdev = cmd->device;
	struct ibmvfc_host *vhost = shost_priv(sdev->host);
	struct scsi_target *starget = scsi_target(sdev);
2045
	int reset_rc;
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	int rc = FAILED;
2047 2048 2049 2050 2051
	unsigned long cancel_rc = 0;

	ENTER;
	ibmvfc_wait_while_resetting(vhost);
	starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all);
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	reset_rc = ibmvfc_reset_device(sdev, IBMVFC_TARGET_RESET, "target");
2053

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	if (!cancel_rc && !reset_rc)
		rc = ibmvfc_wait_for_ops(vhost, starget, ibmvfc_match_target);
2056 2057

	LEAVE;
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	return rc;
2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089
}

/**
 * ibmvfc_eh_host_reset_handler - Reset the connection to the server
 * @cmd:	struct scsi_cmnd having problems
 *
 **/
static int ibmvfc_eh_host_reset_handler(struct scsi_cmnd *cmd)
{
	int rc;
	struct ibmvfc_host *vhost = shost_priv(cmd->device->host);

	dev_err(vhost->dev, "Resetting connection due to error recovery\n");
	rc = ibmvfc_issue_fc_host_lip(vhost->host);
	return rc ? FAILED : SUCCESS;
}

/**
 * ibmvfc_terminate_rport_io - Terminate all pending I/O to the rport.
 * @rport:		rport struct
 *
 * Return value:
 * 	none
 **/
static void ibmvfc_terminate_rport_io(struct fc_rport *rport)
{
	struct scsi_target *starget = to_scsi_target(&rport->dev);
	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
	struct ibmvfc_host *vhost = shost_priv(shost);
	unsigned long cancel_rc = 0;
	unsigned long abort_rc = 0;
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	int rc = FAILED;
2091 2092 2093 2094 2095

	ENTER;
	starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all);
	starget_for_each_device(starget, &abort_rc, ibmvfc_dev_abort_all);

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	if (!cancel_rc && !abort_rc)
		rc = ibmvfc_wait_for_ops(vhost, starget, ibmvfc_match_target);

	if (rc == FAILED)
2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151
		ibmvfc_issue_fc_host_lip(shost);
	LEAVE;
}

static const struct {
	enum ibmvfc_async_event ae;
	const char *desc;
} ae_desc [] = {
	{ IBMVFC_AE_ELS_PLOGI,		"PLOGI" },
	{ IBMVFC_AE_ELS_LOGO,		"LOGO" },
	{ IBMVFC_AE_ELS_PRLO,		"PRLO" },
	{ IBMVFC_AE_SCN_NPORT,		"N-Port SCN" },
	{ IBMVFC_AE_SCN_GROUP,		"Group SCN" },
	{ IBMVFC_AE_SCN_DOMAIN,		"Domain SCN" },
	{ IBMVFC_AE_SCN_FABRIC,		"Fabric SCN" },
	{ IBMVFC_AE_LINK_UP,		"Link Up" },
	{ IBMVFC_AE_LINK_DOWN,		"Link Down" },
	{ IBMVFC_AE_LINK_DEAD,		"Link Dead" },
	{ IBMVFC_AE_HALT,			"Halt" },
	{ IBMVFC_AE_RESUME,		"Resume" },
	{ IBMVFC_AE_ADAPTER_FAILED,	"Adapter Failed" },
};

static const char *unknown_ae = "Unknown async";

/**
 * ibmvfc_get_ae_desc - Get text description for async event
 * @ae:	async event
 *
 **/
static const char *ibmvfc_get_ae_desc(u64 ae)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(ae_desc); i++)
		if (ae_desc[i].ae == ae)
			return ae_desc[i].desc;

	return unknown_ae;
}

/**
 * ibmvfc_handle_async - Handle an async event from the adapter
 * @crq:	crq to process
 * @vhost:	ibmvfc host struct
 *
 **/
static void ibmvfc_handle_async(struct ibmvfc_async_crq *crq,
				struct ibmvfc_host *vhost)
{
	const char *desc = ibmvfc_get_ae_desc(crq->event);

2152 2153
	ibmvfc_log(vhost, 3, "%s event received. scsi_id: %llx, wwpn: %llx,"
		   " node_name: %llx\n", desc, crq->scsi_id, crq->wwpn, crq->node_name);
2154 2155 2156 2157 2158

	switch (crq->event) {
	case IBMVFC_AE_LINK_UP:
	case IBMVFC_AE_RESUME:
		vhost->events_to_log |= IBMVFC_AE_LINKUP;
2159 2160
		vhost->delay_init = 1;
		__ibmvfc_reset_host(vhost);
2161 2162
		break;
	case IBMVFC_AE_SCN_FABRIC:
2163
	case IBMVFC_AE_SCN_DOMAIN:
2164
		vhost->events_to_log |= IBMVFC_AE_RSCN;
2165 2166
		vhost->delay_init = 1;
		__ibmvfc_reset_host(vhost);
2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186
		break;
	case IBMVFC_AE_SCN_NPORT:
	case IBMVFC_AE_SCN_GROUP:
		vhost->events_to_log |= IBMVFC_AE_RSCN;
	case IBMVFC_AE_ELS_LOGO:
	case IBMVFC_AE_ELS_PRLO:
	case IBMVFC_AE_ELS_PLOGI:
		ibmvfc_reinit_host(vhost);
		break;
	case IBMVFC_AE_LINK_DOWN:
	case IBMVFC_AE_ADAPTER_FAILED:
		ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
		break;
	case IBMVFC_AE_LINK_DEAD:
		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
		break;
	case IBMVFC_AE_HALT:
		ibmvfc_link_down(vhost, IBMVFC_HALTED);
		break;
	default:
2187
		dev_err(vhost->dev, "Unknown async event received: %lld\n", crq->event);
2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210
		break;
	};
}

/**
 * ibmvfc_handle_crq - Handles and frees received events in the CRQ
 * @crq:	Command/Response queue
 * @vhost:	ibmvfc host struct
 *
 **/
static void ibmvfc_handle_crq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost)
{
	long rc;
	struct ibmvfc_event *evt = (struct ibmvfc_event *)crq->ioba;

	switch (crq->valid) {
	case IBMVFC_CRQ_INIT_RSP:
		switch (crq->format) {
		case IBMVFC_CRQ_INIT:
			dev_info(vhost->dev, "Partner initialized\n");
			/* Send back a response */
			rc = ibmvfc_send_crq_init_complete(vhost);
			if (rc == 0)
2211
				ibmvfc_init_host(vhost, 0);
2212 2213 2214 2215 2216
			else
				dev_err(vhost->dev, "Unable to send init rsp. rc=%ld\n", rc);
			break;
		case IBMVFC_CRQ_INIT_COMPLETE:
			dev_info(vhost->dev, "Partner initialization complete\n");
2217
			ibmvfc_init_host(vhost, 0);
2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263
			break;
		default:
			dev_err(vhost->dev, "Unknown crq message type: %d\n", crq->format);
		}
		return;
	case IBMVFC_CRQ_XPORT_EVENT:
		vhost->state = IBMVFC_NO_CRQ;
		ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
		if (crq->format == IBMVFC_PARTITION_MIGRATED) {
			/* We need to re-setup the interpartition connection */
			dev_info(vhost->dev, "Re-enabling adapter\n");
			vhost->client_migrated = 1;
			ibmvfc_purge_requests(vhost, DID_REQUEUE);
			if ((rc = ibmvfc_reenable_crq_queue(vhost)) ||
			    (rc = ibmvfc_send_crq_init(vhost))) {
				ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
				dev_err(vhost->dev, "Error after enable (rc=%ld)\n", rc);
			} else
				ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
		} else {
			dev_err(vhost->dev, "Virtual adapter failed (rc=%d)\n", crq->format);

			ibmvfc_purge_requests(vhost, DID_ERROR);
			if ((rc = ibmvfc_reset_crq(vhost)) ||
			    (rc = ibmvfc_send_crq_init(vhost))) {
				ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
				dev_err(vhost->dev, "Error after reset (rc=%ld)\n", rc);
			} else
				ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
		}
		return;
	case IBMVFC_CRQ_CMD_RSP:
		break;
	default:
		dev_err(vhost->dev, "Got an invalid message type 0x%02x\n", crq->valid);
		return;
	}

	if (crq->format == IBMVFC_ASYNC_EVENT)
		return;

	/* The only kind of payload CRQs we should get are responses to
	 * things we send. Make sure this response is to something we
	 * actually sent
	 */
	if (unlikely(!ibmvfc_valid_event(&vhost->pool, evt))) {
2264
		dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n",
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			crq->ioba);
		return;
	}

	if (unlikely(atomic_read(&evt->free))) {
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		dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n",
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			crq->ioba);
		return;
	}

	del_timer(&evt->timer);
	list_del(&evt->queue);
	ibmvfc_trc_end(evt);
	evt->done(evt);
}

/**
 * ibmvfc_scan_finished - Check if the device scan is done.
 * @shost:	scsi host struct
 * @time:	current elapsed time
 *
 * Returns:
 *	0 if scan is not done / 1 if scan is done
 **/
static int ibmvfc_scan_finished(struct Scsi_Host *shost, unsigned long time)
{
	unsigned long flags;
	struct ibmvfc_host *vhost = shost_priv(shost);
	int done = 0;

	spin_lock_irqsave(shost->host_lock, flags);
	if (time >= (init_timeout * HZ)) {
		dev_info(vhost->dev, "Scan taking longer than %d seconds, "
			 "continuing initialization\n", init_timeout);
		done = 1;
	}

	if (vhost->state != IBMVFC_NO_CRQ && vhost->action == IBMVFC_HOST_ACTION_NONE)
		done = 1;
	spin_unlock_irqrestore(shost->host_lock, flags);
	return done;
}

/**
 * ibmvfc_slave_alloc - Setup the device's task set value
 * @sdev:	struct scsi_device device to configure
 *
 * Set the device's task set value so that error handling works as
 * expected.
 *
 * Returns:
 *	0 on success / -ENXIO if device does not exist
 **/
static int ibmvfc_slave_alloc(struct scsi_device *sdev)
{
	struct Scsi_Host *shost = sdev->host;
	struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
	struct ibmvfc_host *vhost = shost_priv(shost);
	unsigned long flags = 0;

	if (!rport || fc_remote_port_chkready(rport))
		return -ENXIO;

	spin_lock_irqsave(shost->host_lock, flags);
	sdev->hostdata = (void *)(unsigned long)vhost->task_set++;
	spin_unlock_irqrestore(shost->host_lock, flags);
	return 0;
}

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/**
 * ibmvfc_target_alloc - Setup the target's task set value
 * @starget:	struct scsi_target
 *
 * Set the target's task set value so that error handling works as
 * expected.
 *
 * Returns:
 *	0 on success / -ENXIO if device does not exist
 **/
static int ibmvfc_target_alloc(struct scsi_target *starget)
{
	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
	struct ibmvfc_host *vhost = shost_priv(shost);
	unsigned long flags = 0;

	spin_lock_irqsave(shost->host_lock, flags);
	starget->hostdata = (void *)(unsigned long)vhost->task_set++;
	spin_unlock_irqrestore(shost->host_lock, flags);
	return 0;
}

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/**
 * ibmvfc_slave_configure - Configure the device
 * @sdev:	struct scsi_device device to configure
 *
 * Enable allow_restart for a device if it is a disk. Adjust the
 * queue_depth here also.
 *
 * Returns:
 *	0
 **/
static int ibmvfc_slave_configure(struct scsi_device *sdev)
{
	struct Scsi_Host *shost = sdev->host;
	struct fc_rport *rport = starget_to_rport(sdev->sdev_target);
	unsigned long flags = 0;

	spin_lock_irqsave(shost->host_lock, flags);
	if (sdev->type == TYPE_DISK)
		sdev->allow_restart = 1;

	if (sdev->tagged_supported) {
		scsi_set_tag_type(sdev, MSG_SIMPLE_TAG);
		scsi_activate_tcq(sdev, sdev->queue_depth);
	} else
		scsi_deactivate_tcq(sdev, sdev->queue_depth);

	rport->dev_loss_tmo = dev_loss_tmo;
	spin_unlock_irqrestore(shost->host_lock, flags);
	return 0;
}

/**
 * ibmvfc_change_queue_depth - Change the device's queue depth
 * @sdev:	scsi device struct
 * @qdepth:	depth to set
 *
 * Return value:
 * 	actual depth set
 **/
static int ibmvfc_change_queue_depth(struct scsi_device *sdev, int qdepth)
{
	if (qdepth > IBMVFC_MAX_CMDS_PER_LUN)
		qdepth = IBMVFC_MAX_CMDS_PER_LUN;

	scsi_adjust_queue_depth(sdev, 0, qdepth);
	return sdev->queue_depth;
}

/**
 * ibmvfc_change_queue_type - Change the device's queue type
 * @sdev:		scsi device struct
 * @tag_type:	type of tags to use
 *
 * Return value:
 * 	actual queue type set
 **/
static int ibmvfc_change_queue_type(struct scsi_device *sdev, int tag_type)
{
	if (sdev->tagged_supported) {
		scsi_set_tag_type(sdev, tag_type);

		if (tag_type)
			scsi_activate_tcq(sdev, sdev->queue_depth);
		else
			scsi_deactivate_tcq(sdev, sdev->queue_depth);
	} else
		tag_type = 0;

	return tag_type;
}

static ssize_t ibmvfc_show_host_partition_name(struct device *dev,
						 struct device_attribute *attr, char *buf)
{
	struct Scsi_Host *shost = class_to_shost(dev);
	struct ibmvfc_host *vhost = shost_priv(shost);

	return snprintf(buf, PAGE_SIZE, "%s\n",
			vhost->login_buf->resp.partition_name);
}

static struct device_attribute ibmvfc_host_partition_name = {
	.attr = {
		.name = "partition_name",
		.mode = S_IRUGO,
	},
	.show = ibmvfc_show_host_partition_name,
};

static ssize_t ibmvfc_show_host_device_name(struct device *dev,
					    struct device_attribute *attr, char *buf)
{
	struct Scsi_Host *shost = class_to_shost(dev);
	struct ibmvfc_host *vhost = shost_priv(shost);

	return snprintf(buf, PAGE_SIZE, "%s\n",
			vhost->login_buf->resp.device_name);
}

static struct device_attribute ibmvfc_host_device_name = {
	.attr = {
		.name = "device_name",
		.mode = S_IRUGO,
	},
	.show = ibmvfc_show_host_device_name,
};

static ssize_t ibmvfc_show_host_loc_code(struct device *dev,
					 struct device_attribute *attr, char *buf)
{
	struct Scsi_Host *shost = class_to_shost(dev);
	struct ibmvfc_host *vhost = shost_priv(shost);

	return snprintf(buf, PAGE_SIZE, "%s\n",
			vhost->login_buf->resp.port_loc_code);
}

static struct device_attribute ibmvfc_host_loc_code = {
	.attr = {
		.name = "port_loc_code",
		.mode = S_IRUGO,
	},
	.show = ibmvfc_show_host_loc_code,
};

static ssize_t ibmvfc_show_host_drc_name(struct device *dev,
					 struct device_attribute *attr, char *buf)
{
	struct Scsi_Host *shost = class_to_shost(dev);
	struct ibmvfc_host *vhost = shost_priv(shost);

	return snprintf(buf, PAGE_SIZE, "%s\n",
			vhost->login_buf->resp.drc_name);
}

static struct device_attribute ibmvfc_host_drc_name = {
	.attr = {
		.name = "drc_name",
		.mode = S_IRUGO,
	},
	.show = ibmvfc_show_host_drc_name,
};

static ssize_t ibmvfc_show_host_npiv_version(struct device *dev,
					     struct device_attribute *attr, char *buf)
{
	struct Scsi_Host *shost = class_to_shost(dev);
	struct ibmvfc_host *vhost = shost_priv(shost);
	return snprintf(buf, PAGE_SIZE, "%d\n", vhost->login_buf->resp.version);
}

static struct device_attribute ibmvfc_host_npiv_version = {
	.attr = {
		.name = "npiv_version",
		.mode = S_IRUGO,
	},
	.show = ibmvfc_show_host_npiv_version,
};

/**
 * ibmvfc_show_log_level - Show the adapter's error logging level
 * @dev:	class device struct
 * @buf:	buffer
 *
 * Return value:
 * 	number of bytes printed to buffer
 **/
static ssize_t ibmvfc_show_log_level(struct device *dev,
				     struct device_attribute *attr, char *buf)
{
	struct Scsi_Host *shost = class_to_shost(dev);
	struct ibmvfc_host *vhost = shost_priv(shost);
	unsigned long flags = 0;
	int len;

	spin_lock_irqsave(shost->host_lock, flags);
	len = snprintf(buf, PAGE_SIZE, "%d\n", vhost->log_level);
	spin_unlock_irqrestore(shost->host_lock, flags);
	return len;
}

/**
 * ibmvfc_store_log_level - Change the adapter's error logging level
 * @dev:	class device struct
 * @buf:	buffer
 *
 * Return value:
 * 	number of bytes printed to buffer
 **/
static ssize_t ibmvfc_store_log_level(struct device *dev,
				      struct device_attribute *attr,
				      const char *buf, size_t count)
{
	struct Scsi_Host *shost = class_to_shost(dev);
	struct ibmvfc_host *vhost = shost_priv(shost);
	unsigned long flags = 0;

	spin_lock_irqsave(shost->host_lock, flags);
	vhost->log_level = simple_strtoul(buf, NULL, 10);
	spin_unlock_irqrestore(shost->host_lock, flags);
	return strlen(buf);
}

static struct device_attribute ibmvfc_log_level_attr = {
	.attr = {
		.name =		"log_level",
		.mode =		S_IRUGO | S_IWUSR,
	},
	.show = ibmvfc_show_log_level,
	.store = ibmvfc_store_log_level
};

#ifdef CONFIG_SCSI_IBMVFC_TRACE
/**
 * ibmvfc_read_trace - Dump the adapter trace
 * @kobj:		kobject struct
 * @bin_attr:	bin_attribute struct
 * @buf:		buffer
 * @off:		offset
 * @count:		buffer size
 *
 * Return value:
 *	number of bytes printed to buffer
 **/
static ssize_t ibmvfc_read_trace(struct kobject *kobj,
				 struct bin_attribute *bin_attr,
				 char *buf, loff_t off, size_t count)
{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct Scsi_Host *shost = class_to_shost(dev);
	struct ibmvfc_host *vhost = shost_priv(shost);
	unsigned long flags = 0;
	int size = IBMVFC_TRACE_SIZE;
	char *src = (char *)vhost->trace;

	if (off > size)
		return 0;
	if (off + count > size) {
		size -= off;
		count = size;
	}

	spin_lock_irqsave(shost->host_lock, flags);
	memcpy(buf, &src[off], count);
	spin_unlock_irqrestore(shost->host_lock, flags);
	return count;
}

static struct bin_attribute ibmvfc_trace_attr = {
	.attr =	{
		.name = "trace",
		.mode = S_IRUGO,
	},
	.size = 0,
	.read = ibmvfc_read_trace,
};
#endif

static struct device_attribute *ibmvfc_attrs[] = {
	&ibmvfc_host_partition_name,
	&ibmvfc_host_device_name,
	&ibmvfc_host_loc_code,
	&ibmvfc_host_drc_name,
	&ibmvfc_host_npiv_version,
	&ibmvfc_log_level_attr,
	NULL
};

static struct scsi_host_template driver_template = {
	.module = THIS_MODULE,
	.name = "IBM POWER Virtual FC Adapter",
	.proc_name = IBMVFC_NAME,
	.queuecommand = ibmvfc_queuecommand,
	.eh_abort_handler = ibmvfc_eh_abort_handler,
	.eh_device_reset_handler = ibmvfc_eh_device_reset_handler,
	.eh_target_reset_handler = ibmvfc_eh_target_reset_handler,
	.eh_host_reset_handler = ibmvfc_eh_host_reset_handler,
	.slave_alloc = ibmvfc_slave_alloc,
	.slave_configure = ibmvfc_slave_configure,
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	.target_alloc = ibmvfc_target_alloc,
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	.scan_finished = ibmvfc_scan_finished,
	.change_queue_depth = ibmvfc_change_queue_depth,
	.change_queue_type = ibmvfc_change_queue_type,
	.cmd_per_lun = 16,
	.can_queue = IBMVFC_MAX_REQUESTS_DEFAULT,
	.this_id = -1,
	.sg_tablesize = SG_ALL,
	.max_sectors = IBMVFC_MAX_SECTORS,
	.use_clustering = ENABLE_CLUSTERING,
	.shost_attrs = ibmvfc_attrs,
};

/**
 * ibmvfc_next_async_crq - Returns the next entry in async queue
 * @vhost:	ibmvfc host struct
 *
 * Returns:
 *	Pointer to next entry in queue / NULL if empty
 **/
static struct ibmvfc_async_crq *ibmvfc_next_async_crq(struct ibmvfc_host *vhost)
{
	struct ibmvfc_async_crq_queue *async_crq = &vhost->async_crq;
	struct ibmvfc_async_crq *crq;

	crq = &async_crq->msgs[async_crq->cur];
	if (crq->valid & 0x80) {
		if (++async_crq->cur == async_crq->size)
			async_crq->cur = 0;
	} else
		crq = NULL;

	return crq;
}

/**
 * ibmvfc_next_crq - Returns the next entry in message queue
 * @vhost:	ibmvfc host struct
 *
 * Returns:
 *	Pointer to next entry in queue / NULL if empty
 **/
static struct ibmvfc_crq *ibmvfc_next_crq(struct ibmvfc_host *vhost)
{
	struct ibmvfc_crq_queue *queue = &vhost->crq;
	struct ibmvfc_crq *crq;

	crq = &queue->msgs[queue->cur];
	if (crq->valid & 0x80) {
		if (++queue->cur == queue->size)
			queue->cur = 0;
	} else
		crq = NULL;

	return crq;
}

/**
 * ibmvfc_interrupt - Interrupt handler
 * @irq:		number of irq to handle, not used
 * @dev_instance: ibmvfc_host that received interrupt
 *
 * Returns:
 *	IRQ_HANDLED
 **/
static irqreturn_t ibmvfc_interrupt(int irq, void *dev_instance)
{
	struct ibmvfc_host *vhost = (struct ibmvfc_host *)dev_instance;
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	unsigned long flags;

	spin_lock_irqsave(vhost->host->host_lock, flags);
	vio_disable_interrupts(to_vio_dev(vhost->dev));
	tasklet_schedule(&vhost->tasklet);
	spin_unlock_irqrestore(vhost->host->host_lock, flags);
	return IRQ_HANDLED;
}

/**
 * ibmvfc_tasklet - Interrupt handler tasklet
 * @data:		ibmvfc host struct
 *
 * Returns:
 *	Nothing
 **/
static void ibmvfc_tasklet(void *data)
{
	struct ibmvfc_host *vhost = data;
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	struct vio_dev *vdev = to_vio_dev(vhost->dev);
	struct ibmvfc_crq *crq;
	struct ibmvfc_async_crq *async;
	unsigned long flags;
	int done = 0;

	spin_lock_irqsave(vhost->host->host_lock, flags);
	while (!done) {
		/* Pull all the valid messages off the CRQ */
		while ((crq = ibmvfc_next_crq(vhost)) != NULL) {
			ibmvfc_handle_crq(crq, vhost);
			crq->valid = 0;
		}

		/* Pull all the valid messages off the async CRQ */
		while ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
			ibmvfc_handle_async(async, vhost);
			async->valid = 0;
		}

		vio_enable_interrupts(vdev);
		if ((crq = ibmvfc_next_crq(vhost)) != NULL) {
			vio_disable_interrupts(vdev);
			ibmvfc_handle_crq(crq, vhost);
			crq->valid = 0;
		} else if ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
			vio_disable_interrupts(vdev);
			ibmvfc_handle_async(async, vhost);
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			async->valid = 0;
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		} else
			done = 1;
	}

	spin_unlock_irqrestore(vhost->host->host_lock, flags);
}

/**
 * ibmvfc_init_tgt - Set the next init job step for the target
 * @tgt:		ibmvfc target struct
 * @job_step:	job step to perform
 *
 **/
static void ibmvfc_init_tgt(struct ibmvfc_target *tgt,
			    void (*job_step) (struct ibmvfc_target *))
{
	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT);
	tgt->job_step = job_step;
	wake_up(&tgt->vhost->work_wait_q);
}

/**
 * ibmvfc_retry_tgt_init - Attempt to retry a step in target initialization
 * @tgt:		ibmvfc target struct
 * @job_step:	initialization job step
 *
 **/
static void ibmvfc_retry_tgt_init(struct ibmvfc_target *tgt,
				  void (*job_step) (struct ibmvfc_target *))
{
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	if (++tgt->init_retries > IBMVFC_MAX_TGT_INIT_RETRIES) {
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		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
		wake_up(&tgt->vhost->work_wait_q);
	} else
		ibmvfc_init_tgt(tgt, job_step);
}

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/* Defined in FC-LS */
static const struct {
	int code;
	int retry;
	int logged_in;
} prli_rsp [] = {
	{ 0, 1, 0 },
	{ 1, 0, 1 },
	{ 2, 1, 0 },
	{ 3, 1, 0 },
	{ 4, 0, 0 },
	{ 5, 0, 0 },
	{ 6, 0, 1 },
	{ 7, 0, 0 },
	{ 8, 1, 0 },
};

/**
 * ibmvfc_get_prli_rsp - Find PRLI response index
 * @flags:	PRLI response flags
 *
 **/
static int ibmvfc_get_prli_rsp(u16 flags)
{
	int i;
	int code = (flags & 0x0f00) >> 8;

	for (i = 0; i < ARRAY_SIZE(prli_rsp); i++)
		if (prli_rsp[i].code == code)
			return i;

	return 0;
}

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/**
 * ibmvfc_tgt_prli_done - Completion handler for Process Login
 * @evt:	ibmvfc event struct
 *
 **/
static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt)
{
	struct ibmvfc_target *tgt = evt->tgt;
	struct ibmvfc_host *vhost = evt->vhost;
	struct ibmvfc_process_login *rsp = &evt->xfer_iu->prli;
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	struct ibmvfc_prli_svc_parms *parms = &rsp->parms;
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	u32 status = rsp->common.status;
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	int index;
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	vhost->discovery_threads--;
	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
	switch (status) {
	case IBMVFC_MAD_SUCCESS:
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		tgt_dbg(tgt, "Process Login succeeded: %X %02X %04X\n",
			parms->type, parms->flags, parms->service_parms);

		if (parms->type == IBMVFC_SCSI_FCP_TYPE) {
			index = ibmvfc_get_prli_rsp(parms->flags);
			if (prli_rsp[index].logged_in) {
				if (parms->flags & IBMVFC_PRLI_EST_IMG_PAIR) {
					tgt->need_login = 0;
					tgt->ids.roles = 0;
					if (parms->service_parms & IBMVFC_PRLI_TARGET_FUNC)
						tgt->ids.roles |= FC_PORT_ROLE_FCP_TARGET;
					if (parms->service_parms & IBMVFC_PRLI_INITIATOR_FUNC)
						tgt->ids.roles |= FC_PORT_ROLE_FCP_INITIATOR;
					ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_ADD_RPORT);
				} else
					ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
			} else if (prli_rsp[index].retry)
				ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
			else
				ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
		} else
			ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874
		break;
	case IBMVFC_MAD_DRIVER_FAILED:
		break;
	case IBMVFC_MAD_CRQ_ERROR:
		ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
		break;
	case IBMVFC_MAD_FAILED:
	default:
		tgt_err(tgt, "Process Login failed: %s (%x:%x) rc=0x%02X\n",
			ibmvfc_get_cmd_error(rsp->status, rsp->error),
			rsp->status, rsp->error, status);
		if (ibmvfc_retry_cmd(rsp->status, rsp->error))
			ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
2875 2876
		else
			ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969
		break;
	};

	kref_put(&tgt->kref, ibmvfc_release_tgt);
	ibmvfc_free_event(evt);
	wake_up(&vhost->work_wait_q);
}

/**
 * ibmvfc_tgt_send_prli - Send a process login
 * @tgt:	ibmvfc target struct
 *
 **/
static void ibmvfc_tgt_send_prli(struct ibmvfc_target *tgt)
{
	struct ibmvfc_process_login *prli;
	struct ibmvfc_host *vhost = tgt->vhost;
	struct ibmvfc_event *evt;

	if (vhost->discovery_threads >= disc_threads)
		return;

	kref_get(&tgt->kref);
	evt = ibmvfc_get_event(vhost);
	vhost->discovery_threads++;
	ibmvfc_init_event(evt, ibmvfc_tgt_prli_done, IBMVFC_MAD_FORMAT);
	evt->tgt = tgt;
	prli = &evt->iu.prli;
	memset(prli, 0, sizeof(*prli));
	prli->common.version = 1;
	prli->common.opcode = IBMVFC_PROCESS_LOGIN;
	prli->common.length = sizeof(*prli);
	prli->scsi_id = tgt->scsi_id;

	prli->parms.type = IBMVFC_SCSI_FCP_TYPE;
	prli->parms.flags = IBMVFC_PRLI_EST_IMG_PAIR;
	prli->parms.service_parms = IBMVFC_PRLI_INITIATOR_FUNC;

	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
	if (ibmvfc_send_event(evt, vhost, default_timeout)) {
		vhost->discovery_threads--;
		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
		kref_put(&tgt->kref, ibmvfc_release_tgt);
	} else
		tgt_dbg(tgt, "Sent process login\n");
}

/**
 * ibmvfc_tgt_plogi_done - Completion handler for Port Login
 * @evt:	ibmvfc event struct
 *
 **/
static void ibmvfc_tgt_plogi_done(struct ibmvfc_event *evt)
{
	struct ibmvfc_target *tgt = evt->tgt;
	struct ibmvfc_host *vhost = evt->vhost;
	struct ibmvfc_port_login *rsp = &evt->xfer_iu->plogi;
	u32 status = rsp->common.status;

	vhost->discovery_threads--;
	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
	switch (status) {
	case IBMVFC_MAD_SUCCESS:
		tgt_dbg(tgt, "Port Login succeeded\n");
		if (tgt->ids.port_name &&
		    tgt->ids.port_name != wwn_to_u64(rsp->service_parms.port_name)) {
			vhost->reinit = 1;
			tgt_dbg(tgt, "Port re-init required\n");
			break;
		}
		tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name);
		tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name);
		tgt->ids.port_id = tgt->scsi_id;
		memcpy(&tgt->service_parms, &rsp->service_parms,
		       sizeof(tgt->service_parms));
		memcpy(&tgt->service_parms_change, &rsp->service_parms_change,
		       sizeof(tgt->service_parms_change));
		ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli);
		break;
	case IBMVFC_MAD_DRIVER_FAILED:
		break;
	case IBMVFC_MAD_CRQ_ERROR:
		ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
		break;
	case IBMVFC_MAD_FAILED:
	default:
		tgt_err(tgt, "Port Login failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
			ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error,
			ibmvfc_get_fc_type(rsp->fc_type), rsp->fc_type,
			ibmvfc_get_ls_explain(rsp->fc_explain), rsp->fc_explain, status);

		if (ibmvfc_retry_cmd(rsp->status, rsp->error))
			ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
2970 2971
		else
			ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
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		break;
	};

	kref_put(&tgt->kref, ibmvfc_release_tgt);
	ibmvfc_free_event(evt);
	wake_up(&vhost->work_wait_q);
}

/**
 * ibmvfc_tgt_send_plogi - Send PLOGI to the specified target
 * @tgt:	ibmvfc target struct
 *
 **/
static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *tgt)
{
	struct ibmvfc_port_login *plogi;
	struct ibmvfc_host *vhost = tgt->vhost;
	struct ibmvfc_event *evt;

	if (vhost->discovery_threads >= disc_threads)
		return;

	kref_get(&tgt->kref);
	evt = ibmvfc_get_event(vhost);
	vhost->discovery_threads++;
	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
	ibmvfc_init_event(evt, ibmvfc_tgt_plogi_done, IBMVFC_MAD_FORMAT);
	evt->tgt = tgt;
	plogi = &evt->iu.plogi;
	memset(plogi, 0, sizeof(*plogi));
	plogi->common.version = 1;
	plogi->common.opcode = IBMVFC_PORT_LOGIN;
	plogi->common.length = sizeof(*plogi);
	plogi->scsi_id = tgt->scsi_id;

	if (ibmvfc_send_event(evt, vhost, default_timeout)) {
		vhost->discovery_threads--;
		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
		kref_put(&tgt->kref, ibmvfc_release_tgt);
	} else
		tgt_dbg(tgt, "Sent port login\n");
}

/**
 * ibmvfc_tgt_implicit_logout_done - Completion handler for Implicit Logout MAD
 * @evt:	ibmvfc event struct
 *
 **/
static void ibmvfc_tgt_implicit_logout_done(struct ibmvfc_event *evt)
{
	struct ibmvfc_target *tgt = evt->tgt;
	struct ibmvfc_host *vhost = evt->vhost;
	struct ibmvfc_implicit_logout *rsp = &evt->xfer_iu->implicit_logout;
	u32 status = rsp->common.status;

	vhost->discovery_threads--;
	ibmvfc_free_event(evt);
	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);

	switch (status) {
	case IBMVFC_MAD_SUCCESS:
		tgt_dbg(tgt, "Implicit Logout succeeded\n");
		break;
	case IBMVFC_MAD_DRIVER_FAILED:
		kref_put(&tgt->kref, ibmvfc_release_tgt);
		wake_up(&vhost->work_wait_q);
		return;
	case IBMVFC_MAD_FAILED:
	default:
		tgt_err(tgt, "Implicit Logout failed: rc=0x%02X\n", status);
		break;
	};

	if (vhost->action == IBMVFC_HOST_ACTION_TGT_INIT)
		ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_plogi);
	else if (vhost->action == IBMVFC_HOST_ACTION_QUERY_TGTS &&
		 tgt->scsi_id != tgt->new_scsi_id)
		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
	kref_put(&tgt->kref, ibmvfc_release_tgt);
	wake_up(&vhost->work_wait_q);
}

/**
 * ibmvfc_tgt_implicit_logout - Initiate an Implicit Logout for specified target
 * @tgt:		ibmvfc target struct
 *
 **/
static void ibmvfc_tgt_implicit_logout(struct ibmvfc_target *tgt)
{
	struct ibmvfc_implicit_logout *mad;
	struct ibmvfc_host *vhost = tgt->vhost;
	struct ibmvfc_event *evt;

	if (vhost->discovery_threads >= disc_threads)
		return;

	kref_get(&tgt->kref);
	evt = ibmvfc_get_event(vhost);
	vhost->discovery_threads++;
	ibmvfc_init_event(evt, ibmvfc_tgt_implicit_logout_done, IBMVFC_MAD_FORMAT);
	evt->tgt = tgt;
	mad = &evt->iu.implicit_logout;
	memset(mad, 0, sizeof(*mad));
	mad->common.version = 1;
	mad->common.opcode = IBMVFC_IMPLICIT_LOGOUT;
	mad->common.length = sizeof(*mad);
	mad->old_scsi_id = tgt->scsi_id;

	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
	if (ibmvfc_send_event(evt, vhost, default_timeout)) {
		vhost->discovery_threads--;
		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
		kref_put(&tgt->kref, ibmvfc_release_tgt);
	} else
		tgt_dbg(tgt, "Sent Implicit Logout\n");
}

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/**
 * ibmvfc_adisc_needs_plogi - Does device need PLOGI?
 * @mad:	ibmvfc passthru mad struct
 * @tgt:	ibmvfc target struct
 *
 * Returns:
 *	1 if PLOGI needed / 0 if PLOGI not needed
 **/
static int ibmvfc_adisc_needs_plogi(struct ibmvfc_passthru_mad *mad,
				    struct ibmvfc_target *tgt)
{
	if (memcmp(&mad->fc_iu.response[2], &tgt->ids.port_name,
		   sizeof(tgt->ids.port_name)))
		return 1;
	if (memcmp(&mad->fc_iu.response[4], &tgt->ids.node_name,
		   sizeof(tgt->ids.node_name)))
		return 1;
	if (mad->fc_iu.response[6] != tgt->scsi_id)
		return 1;
	return 0;
}

/**
 * ibmvfc_tgt_adisc_done - Completion handler for ADISC
 * @evt:	ibmvfc event struct
 *
 **/
static void ibmvfc_tgt_adisc_done(struct ibmvfc_event *evt)
{
	struct ibmvfc_target *tgt = evt->tgt;
	struct ibmvfc_host *vhost = evt->vhost;
	struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru;
	u32 status = mad->common.status;
	u8 fc_reason, fc_explain;

	vhost->discovery_threads--;
	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
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	del_timer(&tgt->timer);
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	switch (status) {
	case IBMVFC_MAD_SUCCESS:
		tgt_dbg(tgt, "ADISC succeeded\n");
		if (ibmvfc_adisc_needs_plogi(mad, tgt))
			tgt->need_login = 1;
		break;
	case IBMVFC_MAD_DRIVER_FAILED:
		break;
	case IBMVFC_MAD_FAILED:
	default:
		tgt->need_login = 1;
		fc_reason = (mad->fc_iu.response[1] & 0x00ff0000) >> 16;
		fc_explain = (mad->fc_iu.response[1] & 0x0000ff00) >> 8;
		tgt_info(tgt, "ADISC failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
			 ibmvfc_get_cmd_error(mad->iu.status, mad->iu.error),
			 mad->iu.status, mad->iu.error,
			 ibmvfc_get_fc_type(fc_reason), fc_reason,
			 ibmvfc_get_ls_explain(fc_explain), fc_explain, status);
		break;
	};

	kref_put(&tgt->kref, ibmvfc_release_tgt);
	ibmvfc_free_event(evt);
	wake_up(&vhost->work_wait_q);
}

/**
 * ibmvfc_init_passthru - Initialize an event struct for FC passthru
 * @evt:		ibmvfc event struct
 *
 **/
static void ibmvfc_init_passthru(struct ibmvfc_event *evt)
{
	struct ibmvfc_passthru_mad *mad = &evt->iu.passthru;

	memset(mad, 0, sizeof(*mad));
	mad->common.version = 1;
	mad->common.opcode = IBMVFC_PASSTHRU;
	mad->common.length = sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu);
	mad->cmd_ioba.va = (u64)evt->crq.ioba +
		offsetof(struct ibmvfc_passthru_mad, iu);
	mad->cmd_ioba.len = sizeof(mad->iu);
	mad->iu.cmd_len = sizeof(mad->fc_iu.payload);
	mad->iu.rsp_len = sizeof(mad->fc_iu.response);
	mad->iu.cmd.va = (u64)evt->crq.ioba +
		offsetof(struct ibmvfc_passthru_mad, fc_iu) +
		offsetof(struct ibmvfc_passthru_fc_iu, payload);
	mad->iu.cmd.len = sizeof(mad->fc_iu.payload);
	mad->iu.rsp.va = (u64)evt->crq.ioba +
		offsetof(struct ibmvfc_passthru_mad, fc_iu) +
		offsetof(struct ibmvfc_passthru_fc_iu, response);
	mad->iu.rsp.len = sizeof(mad->fc_iu.response);
}

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/**
 * ibmvfc_tgt_adisc_cancel_done - Completion handler when cancelling an ADISC
 * @evt:		ibmvfc event struct
 *
 * Just cleanup this event struct. Everything else is handled by
 * the ADISC completion handler. If the ADISC never actually comes
 * back, we still have the timer running on the ADISC event struct
 * which will fire and cause the CRQ to get reset.
 *
 **/
static void ibmvfc_tgt_adisc_cancel_done(struct ibmvfc_event *evt)
{
	struct ibmvfc_host *vhost = evt->vhost;
	struct ibmvfc_target *tgt = evt->tgt;

	tgt_dbg(tgt, "ADISC cancel complete\n");
	vhost->abort_threads--;
	ibmvfc_free_event(evt);
	kref_put(&tgt->kref, ibmvfc_release_tgt);
	wake_up(&vhost->work_wait_q);
}

/**
 * ibmvfc_adisc_timeout - Handle an ADISC timeout
 * @tgt:		ibmvfc target struct
 *
 * If an ADISC times out, send a cancel. If the cancel times
 * out, reset the CRQ. When the ADISC comes back as cancelled,
 * log back into the target.
 **/
static void ibmvfc_adisc_timeout(struct ibmvfc_target *tgt)
{
	struct ibmvfc_host *vhost = tgt->vhost;
	struct ibmvfc_event *evt;
	struct ibmvfc_tmf *tmf;
	unsigned long flags;
	int rc;

	tgt_dbg(tgt, "ADISC timeout\n");
	spin_lock_irqsave(vhost->host->host_lock, flags);
	if (vhost->abort_threads >= disc_threads ||
	    tgt->action != IBMVFC_TGT_ACTION_INIT_WAIT ||
	    vhost->state != IBMVFC_INITIALIZING ||
	    vhost->action != IBMVFC_HOST_ACTION_QUERY_TGTS) {
		spin_unlock_irqrestore(vhost->host->host_lock, flags);
		return;
	}

	vhost->abort_threads++;
	kref_get(&tgt->kref);
	evt = ibmvfc_get_event(vhost);
	ibmvfc_init_event(evt, ibmvfc_tgt_adisc_cancel_done, IBMVFC_MAD_FORMAT);

	evt->tgt = tgt;
	tmf = &evt->iu.tmf;
	memset(tmf, 0, sizeof(*tmf));
	tmf->common.version = 1;
	tmf->common.opcode = IBMVFC_TMF_MAD;
	tmf->common.length = sizeof(*tmf);
	tmf->scsi_id = tgt->scsi_id;
	tmf->cancel_key = tgt->cancel_key;

	rc = ibmvfc_send_event(evt, vhost, default_timeout);

	if (rc) {
		tgt_err(tgt, "Failed to send cancel event for ADISC. rc=%d\n", rc);
		vhost->abort_threads--;
		kref_put(&tgt->kref, ibmvfc_release_tgt);
		__ibmvfc_reset_host(vhost);
	} else
		tgt_dbg(tgt, "Attempting to cancel ADISC\n");
	spin_unlock_irqrestore(vhost->host->host_lock, flags);
}

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/**
 * ibmvfc_tgt_adisc - Initiate an ADISC for specified target
 * @tgt:		ibmvfc target struct
 *
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 * When sending an ADISC we end up with two timers running. The
 * first timer is the timer in the ibmvfc target struct. If this
 * fires, we send a cancel to the target. The second timer is the
 * timer on the ibmvfc event for the ADISC, which is longer. If that
 * fires, it means the ADISC timed out and our attempt to cancel it
 * also failed, so we need to reset the CRQ.
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 **/
static void ibmvfc_tgt_adisc(struct ibmvfc_target *tgt)
{
	struct ibmvfc_passthru_mad *mad;
	struct ibmvfc_host *vhost = tgt->vhost;
	struct ibmvfc_event *evt;

	if (vhost->discovery_threads >= disc_threads)
		return;

	kref_get(&tgt->kref);
	evt = ibmvfc_get_event(vhost);
	vhost->discovery_threads++;
	ibmvfc_init_event(evt, ibmvfc_tgt_adisc_done, IBMVFC_MAD_FORMAT);
	evt->tgt = tgt;

	ibmvfc_init_passthru(evt);
	mad = &evt->iu.passthru;
	mad->iu.flags = IBMVFC_FC_ELS;
	mad->iu.scsi_id = tgt->scsi_id;
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	mad->iu.cancel_key = tgt->cancel_key;
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	mad->fc_iu.payload[0] = IBMVFC_ADISC;
	memcpy(&mad->fc_iu.payload[2], &vhost->login_buf->resp.port_name,
	       sizeof(vhost->login_buf->resp.port_name));
	memcpy(&mad->fc_iu.payload[4], &vhost->login_buf->resp.node_name,
	       sizeof(vhost->login_buf->resp.node_name));
	mad->fc_iu.payload[6] = vhost->login_buf->resp.scsi_id & 0x00ffffff;

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	if (timer_pending(&tgt->timer))
		mod_timer(&tgt->timer, jiffies + (IBMVFC_ADISC_TIMEOUT * HZ));
	else {
		tgt->timer.data = (unsigned long) tgt;
		tgt->timer.expires = jiffies + (IBMVFC_ADISC_TIMEOUT * HZ);
		tgt->timer.function = (void (*)(unsigned long))ibmvfc_adisc_timeout;
		add_timer(&tgt->timer);
	}

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	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
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	if (ibmvfc_send_event(evt, vhost, IBMVFC_ADISC_PLUS_CANCEL_TIMEOUT)) {
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		vhost->discovery_threads--;
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		del_timer(&tgt->timer);
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		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
		kref_put(&tgt->kref, ibmvfc_release_tgt);
	} else
		tgt_dbg(tgt, "Sent ADISC\n");
}

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/**
 * ibmvfc_tgt_query_target_done - Completion handler for Query Target MAD
 * @evt:	ibmvfc event struct
 *
 **/
static void ibmvfc_tgt_query_target_done(struct ibmvfc_event *evt)
{
	struct ibmvfc_target *tgt = evt->tgt;
	struct ibmvfc_host *vhost = evt->vhost;
	struct ibmvfc_query_tgt *rsp = &evt->xfer_iu->query_tgt;
	u32 status = rsp->common.status;

	vhost->discovery_threads--;
	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
	switch (status) {
	case IBMVFC_MAD_SUCCESS:
		tgt_dbg(tgt, "Query Target succeeded\n");
		tgt->new_scsi_id = rsp->scsi_id;
		if (rsp->scsi_id != tgt->scsi_id)
			ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
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		else
			ibmvfc_init_tgt(tgt, ibmvfc_tgt_adisc);
3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354
		break;
	case IBMVFC_MAD_DRIVER_FAILED:
		break;
	case IBMVFC_MAD_CRQ_ERROR:
		ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
		break;
	case IBMVFC_MAD_FAILED:
	default:
		tgt_err(tgt, "Query Target failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
			ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error,
			ibmvfc_get_fc_type(rsp->fc_type), rsp->fc_type,
			ibmvfc_get_gs_explain(rsp->fc_explain), rsp->fc_explain, status);

		if ((rsp->status & IBMVFC_FABRIC_MAPPED) == IBMVFC_FABRIC_MAPPED &&
		    rsp->error == IBMVFC_UNABLE_TO_PERFORM_REQ &&
		    rsp->fc_explain == IBMVFC_PORT_NAME_NOT_REG)
			ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
		else if (ibmvfc_retry_cmd(rsp->status, rsp->error))
			ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
3355 3356
		else
			ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424
		break;
	};

	kref_put(&tgt->kref, ibmvfc_release_tgt);
	ibmvfc_free_event(evt);
	wake_up(&vhost->work_wait_q);
}

/**
 * ibmvfc_tgt_query_target - Initiate a Query Target for specified target
 * @tgt:	ibmvfc target struct
 *
 **/
static void ibmvfc_tgt_query_target(struct ibmvfc_target *tgt)
{
	struct ibmvfc_query_tgt *query_tgt;
	struct ibmvfc_host *vhost = tgt->vhost;
	struct ibmvfc_event *evt;

	if (vhost->discovery_threads >= disc_threads)
		return;

	kref_get(&tgt->kref);
	evt = ibmvfc_get_event(vhost);
	vhost->discovery_threads++;
	evt->tgt = tgt;
	ibmvfc_init_event(evt, ibmvfc_tgt_query_target_done, IBMVFC_MAD_FORMAT);
	query_tgt = &evt->iu.query_tgt;
	memset(query_tgt, 0, sizeof(*query_tgt));
	query_tgt->common.version = 1;
	query_tgt->common.opcode = IBMVFC_QUERY_TARGET;
	query_tgt->common.length = sizeof(*query_tgt);
	query_tgt->wwpn = tgt->ids.port_name;

	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
	if (ibmvfc_send_event(evt, vhost, default_timeout)) {
		vhost->discovery_threads--;
		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
		kref_put(&tgt->kref, ibmvfc_release_tgt);
	} else
		tgt_dbg(tgt, "Sent Query Target\n");
}

/**
 * ibmvfc_alloc_target - Allocate and initialize an ibmvfc target
 * @vhost:		ibmvfc host struct
 * @scsi_id:	SCSI ID to allocate target for
 *
 * Returns:
 *	0 on success / other on failure
 **/
static int ibmvfc_alloc_target(struct ibmvfc_host *vhost, u64 scsi_id)
{
	struct ibmvfc_target *tgt;
	unsigned long flags;

	spin_lock_irqsave(vhost->host->host_lock, flags);
	list_for_each_entry(tgt, &vhost->targets, queue) {
		if (tgt->scsi_id == scsi_id) {
			if (tgt->need_login)
				ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
			goto unlock_out;
		}
	}
	spin_unlock_irqrestore(vhost->host->host_lock, flags);

	tgt = mempool_alloc(vhost->tgt_pool, GFP_KERNEL);
	if (!tgt) {
3425
		dev_err(vhost->dev, "Target allocation failure for scsi id %08llx\n",
3426 3427 3428 3429
			scsi_id);
		return -ENOMEM;
	}

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	memset(tgt, 0, sizeof(*tgt));
3431 3432 3433 3434
	tgt->scsi_id = scsi_id;
	tgt->new_scsi_id = scsi_id;
	tgt->vhost = vhost;
	tgt->need_login = 1;
3435 3436
	tgt->cancel_key = vhost->task_set++;
	init_timer(&tgt->timer);
3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577 3578 3579 3580 3581 3582 3583 3584 3585 3586 3587 3588 3589 3590 3591 3592 3593 3594 3595 3596 3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 3618 3619 3620 3621 3622 3623 3624 3625 3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637 3638 3639 3640 3641 3642 3643 3644 3645 3646 3647 3648 3649 3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663 3664 3665 3666 3667 3668 3669 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681 3682 3683 3684 3685 3686 3687 3688 3689
	kref_init(&tgt->kref);
	ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
	spin_lock_irqsave(vhost->host->host_lock, flags);
	list_add_tail(&tgt->queue, &vhost->targets);

unlock_out:
	spin_unlock_irqrestore(vhost->host->host_lock, flags);
	return 0;
}

/**
 * ibmvfc_alloc_targets - Allocate and initialize ibmvfc targets
 * @vhost:		ibmvfc host struct
 *
 * Returns:
 *	0 on success / other on failure
 **/
static int ibmvfc_alloc_targets(struct ibmvfc_host *vhost)
{
	int i, rc;

	for (i = 0, rc = 0; !rc && i < vhost->num_targets; i++)
		rc = ibmvfc_alloc_target(vhost,
					 vhost->disc_buf->scsi_id[i] & IBMVFC_DISC_TGT_SCSI_ID_MASK);

	return rc;
}

/**
 * ibmvfc_discover_targets_done - Completion handler for discover targets MAD
 * @evt:	ibmvfc event struct
 *
 **/
static void ibmvfc_discover_targets_done(struct ibmvfc_event *evt)
{
	struct ibmvfc_host *vhost = evt->vhost;
	struct ibmvfc_discover_targets *rsp = &evt->xfer_iu->discover_targets;
	u32 mad_status = rsp->common.status;

	switch (mad_status) {
	case IBMVFC_MAD_SUCCESS:
		ibmvfc_dbg(vhost, "Discover Targets succeeded\n");
		vhost->num_targets = rsp->num_written;
		ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_ALLOC_TGTS);
		break;
	case IBMVFC_MAD_FAILED:
		dev_err(vhost->dev, "Discover Targets failed: %s (%x:%x)\n",
			ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error);
		ibmvfc_retry_host_init(vhost);
		break;
	case IBMVFC_MAD_DRIVER_FAILED:
		break;
	default:
		dev_err(vhost->dev, "Invalid Discover Targets response: 0x%x\n", mad_status);
		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
		break;
	}

	ibmvfc_free_event(evt);
	wake_up(&vhost->work_wait_q);
}

/**
 * ibmvfc_discover_targets - Send Discover Targets MAD
 * @vhost:	ibmvfc host struct
 *
 **/
static void ibmvfc_discover_targets(struct ibmvfc_host *vhost)
{
	struct ibmvfc_discover_targets *mad;
	struct ibmvfc_event *evt = ibmvfc_get_event(vhost);

	ibmvfc_init_event(evt, ibmvfc_discover_targets_done, IBMVFC_MAD_FORMAT);
	mad = &evt->iu.discover_targets;
	memset(mad, 0, sizeof(*mad));
	mad->common.version = 1;
	mad->common.opcode = IBMVFC_DISC_TARGETS;
	mad->common.length = sizeof(*mad);
	mad->bufflen = vhost->disc_buf_sz;
	mad->buffer.va = vhost->disc_buf_dma;
	mad->buffer.len = vhost->disc_buf_sz;
	ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);

	if (!ibmvfc_send_event(evt, vhost, default_timeout))
		ibmvfc_dbg(vhost, "Sent discover targets\n");
	else
		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
}

/**
 * ibmvfc_npiv_login_done - Completion handler for NPIV Login
 * @evt:	ibmvfc event struct
 *
 **/
static void ibmvfc_npiv_login_done(struct ibmvfc_event *evt)
{
	struct ibmvfc_host *vhost = evt->vhost;
	u32 mad_status = evt->xfer_iu->npiv_login.common.status;
	struct ibmvfc_npiv_login_resp *rsp = &vhost->login_buf->resp;
	unsigned int npiv_max_sectors;

	switch (mad_status) {
	case IBMVFC_MAD_SUCCESS:
		ibmvfc_free_event(evt);
		break;
	case IBMVFC_MAD_FAILED:
		dev_err(vhost->dev, "NPIV Login failed: %s (%x:%x)\n",
			ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error);
		if (ibmvfc_retry_cmd(rsp->status, rsp->error))
			ibmvfc_retry_host_init(vhost);
		else
			ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
		ibmvfc_free_event(evt);
		return;
	case IBMVFC_MAD_CRQ_ERROR:
		ibmvfc_retry_host_init(vhost);
	case IBMVFC_MAD_DRIVER_FAILED:
		ibmvfc_free_event(evt);
		return;
	default:
		dev_err(vhost->dev, "Invalid NPIV Login response: 0x%x\n", mad_status);
		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
		ibmvfc_free_event(evt);
		return;
	}

	vhost->client_migrated = 0;

	if (!(rsp->flags & IBMVFC_NATIVE_FC)) {
		dev_err(vhost->dev, "Virtual adapter does not support FC. %x\n",
			rsp->flags);
		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
		wake_up(&vhost->work_wait_q);
		return;
	}

	if (rsp->max_cmds <= IBMVFC_NUM_INTERNAL_REQ) {
		dev_err(vhost->dev, "Virtual adapter supported queue depth too small: %d\n",
			rsp->max_cmds);
		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
		wake_up(&vhost->work_wait_q);
		return;
	}

	npiv_max_sectors = min((uint)(rsp->max_dma_len >> 9), IBMVFC_MAX_SECTORS);
	dev_info(vhost->dev, "Host partition: %s, device: %s %s %s max sectors %u\n",
		 rsp->partition_name, rsp->device_name, rsp->port_loc_code,
		 rsp->drc_name, npiv_max_sectors);

	fc_host_fabric_name(vhost->host) = rsp->node_name;
	fc_host_node_name(vhost->host) = rsp->node_name;
	fc_host_port_name(vhost->host) = rsp->port_name;
	fc_host_port_id(vhost->host) = rsp->scsi_id;
	fc_host_port_type(vhost->host) = FC_PORTTYPE_NPIV;
	fc_host_supported_classes(vhost->host) = 0;
	if (rsp->service_parms.class1_parms[0] & 0x80000000)
		fc_host_supported_classes(vhost->host) |= FC_COS_CLASS1;
	if (rsp->service_parms.class2_parms[0] & 0x80000000)
		fc_host_supported_classes(vhost->host) |= FC_COS_CLASS2;
	if (rsp->service_parms.class3_parms[0] & 0x80000000)
		fc_host_supported_classes(vhost->host) |= FC_COS_CLASS3;
	fc_host_maxframe_size(vhost->host) =
		rsp->service_parms.common.bb_rcv_sz & 0x0fff;

	vhost->host->can_queue = rsp->max_cmds - IBMVFC_NUM_INTERNAL_REQ;
	vhost->host->max_sectors = npiv_max_sectors;
	ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
	wake_up(&vhost->work_wait_q);
}

/**
 * ibmvfc_npiv_login - Sends NPIV login
 * @vhost:	ibmvfc host struct
 *
 **/
static void ibmvfc_npiv_login(struct ibmvfc_host *vhost)
{
	struct ibmvfc_npiv_login_mad *mad;
	struct ibmvfc_event *evt = ibmvfc_get_event(vhost);

	ibmvfc_gather_partition_info(vhost);
	ibmvfc_set_login_info(vhost);
	ibmvfc_init_event(evt, ibmvfc_npiv_login_done, IBMVFC_MAD_FORMAT);

	memcpy(vhost->login_buf, &vhost->login_info, sizeof(vhost->login_info));
	mad = &evt->iu.npiv_login;
	memset(mad, 0, sizeof(struct ibmvfc_npiv_login_mad));
	mad->common.version = 1;
	mad->common.opcode = IBMVFC_NPIV_LOGIN;
	mad->common.length = sizeof(struct ibmvfc_npiv_login_mad);
	mad->buffer.va = vhost->login_buf_dma;
	mad->buffer.len = sizeof(*vhost->login_buf);

	ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);

	if (!ibmvfc_send_event(evt, vhost, default_timeout))
		ibmvfc_dbg(vhost, "Sent NPIV login\n");
	else
		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
};

/**
 * ibmvfc_dev_init_to_do - Is there target initialization work to do?
 * @vhost:		ibmvfc host struct
 *
 * Returns:
 *	1 if work to do / 0 if not
 **/
static int ibmvfc_dev_init_to_do(struct ibmvfc_host *vhost)
{
	struct ibmvfc_target *tgt;

	list_for_each_entry(tgt, &vhost->targets, queue) {
		if (tgt->action == IBMVFC_TGT_ACTION_INIT ||
		    tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
			return 1;
	}

	return 0;
}

/**
 * __ibmvfc_work_to_do - Is there task level work to do? (no locking)
 * @vhost:		ibmvfc host struct
 *
 * Returns:
 *	1 if work to do / 0 if not
 **/
static int __ibmvfc_work_to_do(struct ibmvfc_host *vhost)
{
	struct ibmvfc_target *tgt;

	if (kthread_should_stop())
		return 1;
	switch (vhost->action) {
	case IBMVFC_HOST_ACTION_NONE:
	case IBMVFC_HOST_ACTION_INIT_WAIT:
		return 0;
	case IBMVFC_HOST_ACTION_TGT_INIT:
	case IBMVFC_HOST_ACTION_QUERY_TGTS:
		if (vhost->discovery_threads == disc_threads)
			return 0;
		list_for_each_entry(tgt, &vhost->targets, queue)
			if (tgt->action == IBMVFC_TGT_ACTION_INIT)
				return 1;
		list_for_each_entry(tgt, &vhost->targets, queue)
			if (tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
				return 0;
		return 1;
	case IBMVFC_HOST_ACTION_INIT:
	case IBMVFC_HOST_ACTION_ALLOC_TGTS:
	case IBMVFC_HOST_ACTION_TGT_ADD:
	case IBMVFC_HOST_ACTION_TGT_DEL:
3690
	case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
3691 3692 3693 3694 3695 3696 3697 3698 3699 3700 3701 3702 3703 3704 3705 3706 3707 3708 3709 3710 3711 3712 3713 3714 3715 3716 3717 3718 3719 3720 3721 3722 3723 3724 3725 3726 3727 3728 3729 3730 3731 3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742
	case IBMVFC_HOST_ACTION_QUERY:
	default:
		break;
	};

	return 1;
}

/**
 * ibmvfc_work_to_do - Is there task level work to do?
 * @vhost:		ibmvfc host struct
 *
 * Returns:
 *	1 if work to do / 0 if not
 **/
static int ibmvfc_work_to_do(struct ibmvfc_host *vhost)
{
	unsigned long flags;
	int rc;

	spin_lock_irqsave(vhost->host->host_lock, flags);
	rc = __ibmvfc_work_to_do(vhost);
	spin_unlock_irqrestore(vhost->host->host_lock, flags);
	return rc;
}

/**
 * ibmvfc_log_ae - Log async events if necessary
 * @vhost:		ibmvfc host struct
 * @events:		events to log
 *
 **/
static void ibmvfc_log_ae(struct ibmvfc_host *vhost, int events)
{
	if (events & IBMVFC_AE_RSCN)
		fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_RSCN, 0);
	if ((events & IBMVFC_AE_LINKDOWN) &&
	    vhost->state >= IBMVFC_HALTED)
		fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKDOWN, 0);
	if ((events & IBMVFC_AE_LINKUP) &&
	    vhost->state == IBMVFC_INITIALIZING)
		fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKUP, 0);
}

/**
 * ibmvfc_tgt_add_rport - Tell the FC transport about a new remote port
 * @tgt:		ibmvfc target struct
 *
 **/
static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt)
{
	struct ibmvfc_host *vhost = tgt->vhost;
B
Brian King 已提交
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	struct fc_rport *rport = tgt->rport;
3744 3745
	unsigned long flags;

B
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3746 3747 3748 3749 3750 3751 3752 3753 3754
	if (rport) {
		tgt_dbg(tgt, "Setting rport roles\n");
		fc_remote_port_rolechg(rport, tgt->ids.roles);
		spin_lock_irqsave(vhost->host->host_lock, flags);
		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
		spin_unlock_irqrestore(vhost->host->host_lock, flags);
		return;
	}

3755 3756 3757 3758 3759 3760 3761 3762 3763
	tgt_dbg(tgt, "Adding rport\n");
	rport = fc_remote_port_add(vhost->host, 0, &tgt->ids);
	spin_lock_irqsave(vhost->host->host_lock, flags);
	tgt->rport = rport;
	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
	if (rport) {
		tgt_dbg(tgt, "rport add succeeded\n");
		rport->maxframe_size = tgt->service_parms.common.bb_rcv_sz & 0x0fff;
		rport->supported_classes = 0;
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		tgt->target_id = rport->scsi_target_id;
3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780 3781 3782 3783 3784 3785 3786 3787 3788 3789 3790 3791 3792 3793 3794 3795
		if (tgt->service_parms.class1_parms[0] & 0x80000000)
			rport->supported_classes |= FC_COS_CLASS1;
		if (tgt->service_parms.class2_parms[0] & 0x80000000)
			rport->supported_classes |= FC_COS_CLASS2;
		if (tgt->service_parms.class3_parms[0] & 0x80000000)
			rport->supported_classes |= FC_COS_CLASS3;
	} else
		tgt_dbg(tgt, "rport add failed\n");
	spin_unlock_irqrestore(vhost->host->host_lock, flags);
}

/**
 * ibmvfc_do_work - Do task level work
 * @vhost:		ibmvfc host struct
 *
 **/
static void ibmvfc_do_work(struct ibmvfc_host *vhost)
{
	struct ibmvfc_target *tgt;
	unsigned long flags;
	struct fc_rport *rport;

	ibmvfc_log_ae(vhost, vhost->events_to_log);
	spin_lock_irqsave(vhost->host->host_lock, flags);
	vhost->events_to_log = 0;
	switch (vhost->action) {
	case IBMVFC_HOST_ACTION_NONE:
	case IBMVFC_HOST_ACTION_INIT_WAIT:
		break;
	case IBMVFC_HOST_ACTION_INIT:
		BUG_ON(vhost->state != IBMVFC_INITIALIZING);
3796 3797 3798
		if (vhost->delay_init) {
			vhost->delay_init = 0;
			spin_unlock_irqrestore(vhost->host->host_lock, flags);
3799
			ssleep(15);
3800 3801 3802
			return;
		} else
			vhost->job_step(vhost);
3803 3804 3805 3806 3807 3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818 3819 3820
		break;
	case IBMVFC_HOST_ACTION_QUERY:
		list_for_each_entry(tgt, &vhost->targets, queue)
			ibmvfc_init_tgt(tgt, ibmvfc_tgt_query_target);
		ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY_TGTS);
		break;
	case IBMVFC_HOST_ACTION_QUERY_TGTS:
		list_for_each_entry(tgt, &vhost->targets, queue) {
			if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
				tgt->job_step(tgt);
				break;
			}
		}

		if (!ibmvfc_dev_init_to_do(vhost))
			ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
		break;
	case IBMVFC_HOST_ACTION_TGT_DEL:
3821
	case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
3822 3823 3824 3825 3826 3827 3828 3829 3830
		list_for_each_entry(tgt, &vhost->targets, queue) {
			if (tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
				tgt_dbg(tgt, "Deleting rport\n");
				rport = tgt->rport;
				tgt->rport = NULL;
				list_del(&tgt->queue);
				spin_unlock_irqrestore(vhost->host->host_lock, flags);
				if (rport)
					fc_remote_port_delete(rport);
3831
				del_timer_sync(&tgt->timer);
3832 3833 3834 3835 3836 3837
				kref_put(&tgt->kref, ibmvfc_release_tgt);
				return;
			}
		}

		if (vhost->state == IBMVFC_INITIALIZING) {
3838 3839 3840 3841 3842 3843 3844 3845 3846 3847 3848
			if (vhost->action == IBMVFC_HOST_ACTION_TGT_DEL_FAILED) {
				ibmvfc_set_host_state(vhost, IBMVFC_ACTIVE);
				ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_ADD);
				vhost->init_retries = 0;
				spin_unlock_irqrestore(vhost->host->host_lock, flags);
				scsi_unblock_requests(vhost->host);
				return;
			} else {
				ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
				vhost->job_step = ibmvfc_discover_targets;
			}
3849 3850 3851 3852 3853 3854 3855 3856 3857 3858 3859 3860 3861 3862 3863 3864 3865 3866 3867 3868 3869 3870
		} else {
			ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
			spin_unlock_irqrestore(vhost->host->host_lock, flags);
			scsi_unblock_requests(vhost->host);
			wake_up(&vhost->init_wait_q);
			return;
		}
		break;
	case IBMVFC_HOST_ACTION_ALLOC_TGTS:
		ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_INIT);
		spin_unlock_irqrestore(vhost->host->host_lock, flags);
		ibmvfc_alloc_targets(vhost);
		spin_lock_irqsave(vhost->host->host_lock, flags);
		break;
	case IBMVFC_HOST_ACTION_TGT_INIT:
		list_for_each_entry(tgt, &vhost->targets, queue) {
			if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
				tgt->job_step(tgt);
				break;
			}
		}

3871 3872
		if (!ibmvfc_dev_init_to_do(vhost))
			ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL_FAILED);
3873 3874 3875 3876 3877 3878 3879 3880 3881 3882
		break;
	case IBMVFC_HOST_ACTION_TGT_ADD:
		list_for_each_entry(tgt, &vhost->targets, queue) {
			if (tgt->action == IBMVFC_TGT_ACTION_ADD_RPORT) {
				spin_unlock_irqrestore(vhost->host->host_lock, flags);
				ibmvfc_tgt_add_rport(tgt);
				return;
			}
		}

3883
		if (vhost->reinit && !ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
3884
			vhost->reinit = 0;
3885
			scsi_block_requests(vhost->host);
3886 3887 3888 3889 3890 3891 3892 3893 3894 3895 3896 3897 3898 3899 3900 3901 3902 3903 3904 3905 3906 3907 3908 3909 3910 3911 3912 3913 3914 3915 3916 3917 3918 3919 3920 3921 3922 3923 3924 3925 3926 3927 3928 3929 3930 3931 3932 3933 3934 3935 3936 3937 3938 3939 3940 3941 3942 3943 3944 3945 3946 3947 3948 3949 3950 3951 3952 3953 3954 3955
			ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
		} else {
			ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
			wake_up(&vhost->init_wait_q);
		}
		break;
	default:
		break;
	};

	spin_unlock_irqrestore(vhost->host->host_lock, flags);
}

/**
 * ibmvfc_work - Do task level work
 * @data:		ibmvfc host struct
 *
 * Returns:
 *	zero
 **/
static int ibmvfc_work(void *data)
{
	struct ibmvfc_host *vhost = data;
	int rc;

	set_user_nice(current, -20);

	while (1) {
		rc = wait_event_interruptible(vhost->work_wait_q,
					      ibmvfc_work_to_do(vhost));

		BUG_ON(rc);

		if (kthread_should_stop())
			break;

		ibmvfc_do_work(vhost);
	}

	ibmvfc_dbg(vhost, "ibmvfc kthread exiting...\n");
	return 0;
}

/**
 * ibmvfc_init_crq - Initializes and registers CRQ with hypervisor
 * @vhost:	ibmvfc host struct
 *
 * Allocates a page for messages, maps it for dma, and registers
 * the crq with the hypervisor.
 *
 * Return value:
 *	zero on success / other on failure
 **/
static int ibmvfc_init_crq(struct ibmvfc_host *vhost)
{
	int rc, retrc = -ENOMEM;
	struct device *dev = vhost->dev;
	struct vio_dev *vdev = to_vio_dev(dev);
	struct ibmvfc_crq_queue *crq = &vhost->crq;

	ENTER;
	crq->msgs = (struct ibmvfc_crq *)get_zeroed_page(GFP_KERNEL);

	if (!crq->msgs)
		return -ENOMEM;

	crq->size = PAGE_SIZE / sizeof(*crq->msgs);
	crq->msg_token = dma_map_single(dev, crq->msgs,
					PAGE_SIZE, DMA_BIDIRECTIONAL);

3956
	if (dma_mapping_error(dev, crq->msg_token))
3957 3958 3959 3960 3961 3962 3963 3964 3965 3966 3967 3968 3969 3970 3971 3972 3973 3974
		goto map_failed;

	retrc = rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
					crq->msg_token, PAGE_SIZE);

	if (rc == H_RESOURCE)
		/* maybe kexecing and resource is busy. try a reset */
		retrc = rc = ibmvfc_reset_crq(vhost);

	if (rc == H_CLOSED)
		dev_warn(dev, "Partner adapter not ready\n");
	else if (rc) {
		dev_warn(dev, "Error %d opening adapter\n", rc);
		goto reg_crq_failed;
	}

	retrc = 0;

3975 3976
	tasklet_init(&vhost->tasklet, (void *)ibmvfc_tasklet, (unsigned long)vhost);

3977 3978 3979 3980 3981 3982 3983 3984 3985 3986 3987 3988 3989 3990 3991
	if ((rc = request_irq(vdev->irq, ibmvfc_interrupt, 0, IBMVFC_NAME, vhost))) {
		dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n", vdev->irq, rc);
		goto req_irq_failed;
	}

	if ((rc = vio_enable_interrupts(vdev))) {
		dev_err(dev, "Error %d enabling interrupts\n", rc);
		goto req_irq_failed;
	}

	crq->cur = 0;
	LEAVE;
	return retrc;

req_irq_failed:
3992
	tasklet_kill(&vhost->tasklet);
3993 3994 3995 3996 3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 4008 4009 4010 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020 4021 4022 4023 4024 4025 4026 4027 4028 4029 4030 4031 4032 4033 4034 4035 4036 4037 4038 4039 4040 4041 4042 4043 4044 4045 4046 4047 4048 4049 4050 4051
	do {
		rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
	} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
reg_crq_failed:
	dma_unmap_single(dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
map_failed:
	free_page((unsigned long)crq->msgs);
	return retrc;
}

/**
 * ibmvfc_free_mem - Free memory for vhost
 * @vhost:	ibmvfc host struct
 *
 * Return value:
 * 	none
 **/
static void ibmvfc_free_mem(struct ibmvfc_host *vhost)
{
	struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;

	ENTER;
	mempool_destroy(vhost->tgt_pool);
	kfree(vhost->trace);
	dma_free_coherent(vhost->dev, vhost->disc_buf_sz, vhost->disc_buf,
			  vhost->disc_buf_dma);
	dma_free_coherent(vhost->dev, sizeof(*vhost->login_buf),
			  vhost->login_buf, vhost->login_buf_dma);
	dma_pool_destroy(vhost->sg_pool);
	dma_unmap_single(vhost->dev, async_q->msg_token,
			 async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
	free_page((unsigned long)async_q->msgs);
	LEAVE;
}

/**
 * ibmvfc_alloc_mem - Allocate memory for vhost
 * @vhost:	ibmvfc host struct
 *
 * Return value:
 * 	0 on success / non-zero on failure
 **/
static int ibmvfc_alloc_mem(struct ibmvfc_host *vhost)
{
	struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
	struct device *dev = vhost->dev;

	ENTER;
	async_q->msgs = (struct ibmvfc_async_crq *)get_zeroed_page(GFP_KERNEL);
	if (!async_q->msgs) {
		dev_err(dev, "Couldn't allocate async queue.\n");
		goto nomem;
	}

	async_q->size = PAGE_SIZE / sizeof(struct ibmvfc_async_crq);
	async_q->msg_token = dma_map_single(dev, async_q->msgs,
					    async_q->size * sizeof(*async_q->msgs),
					    DMA_BIDIRECTIONAL);

4052
	if (dma_mapping_error(dev, async_q->msg_token)) {
4053 4054 4055 4056 4057 4058 4059 4060 4061 4062 4063 4064 4065 4066 4067 4068 4069 4070 4071 4072 4073 4074 4075 4076 4077 4078 4079 4080 4081 4082 4083 4084 4085 4086 4087 4088 4089 4090 4091 4092 4093 4094 4095 4096 4097 4098 4099 4100 4101 4102 4103 4104 4105 4106 4107 4108 4109 4110 4111 4112 4113 4114 4115 4116 4117 4118 4119 4120 4121 4122 4123 4124 4125 4126 4127 4128 4129 4130 4131 4132 4133 4134 4135 4136 4137 4138 4139 4140 4141 4142 4143 4144 4145 4146 4147 4148 4149 4150 4151 4152 4153 4154 4155 4156 4157 4158
		dev_err(dev, "Failed to map async queue\n");
		goto free_async_crq;
	}

	vhost->sg_pool = dma_pool_create(IBMVFC_NAME, dev,
					 SG_ALL * sizeof(struct srp_direct_buf),
					 sizeof(struct srp_direct_buf), 0);

	if (!vhost->sg_pool) {
		dev_err(dev, "Failed to allocate sg pool\n");
		goto unmap_async_crq;
	}

	vhost->login_buf = dma_alloc_coherent(dev, sizeof(*vhost->login_buf),
					      &vhost->login_buf_dma, GFP_KERNEL);

	if (!vhost->login_buf) {
		dev_err(dev, "Couldn't allocate NPIV login buffer\n");
		goto free_sg_pool;
	}

	vhost->disc_buf_sz = sizeof(vhost->disc_buf->scsi_id[0]) * max_targets;
	vhost->disc_buf = dma_alloc_coherent(dev, vhost->disc_buf_sz,
					     &vhost->disc_buf_dma, GFP_KERNEL);

	if (!vhost->disc_buf) {
		dev_err(dev, "Couldn't allocate Discover Targets buffer\n");
		goto free_login_buffer;
	}

	vhost->trace = kcalloc(IBMVFC_NUM_TRACE_ENTRIES,
			       sizeof(struct ibmvfc_trace_entry), GFP_KERNEL);

	if (!vhost->trace)
		goto free_disc_buffer;

	vhost->tgt_pool = mempool_create_kzalloc_pool(IBMVFC_TGT_MEMPOOL_SZ,
						      sizeof(struct ibmvfc_target));

	if (!vhost->tgt_pool) {
		dev_err(dev, "Couldn't allocate target memory pool\n");
		goto free_trace;
	}

	LEAVE;
	return 0;

free_trace:
	kfree(vhost->trace);
free_disc_buffer:
	dma_free_coherent(dev, vhost->disc_buf_sz, vhost->disc_buf,
			  vhost->disc_buf_dma);
free_login_buffer:
	dma_free_coherent(dev, sizeof(*vhost->login_buf),
			  vhost->login_buf, vhost->login_buf_dma);
free_sg_pool:
	dma_pool_destroy(vhost->sg_pool);
unmap_async_crq:
	dma_unmap_single(dev, async_q->msg_token,
			 async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
free_async_crq:
	free_page((unsigned long)async_q->msgs);
nomem:
	LEAVE;
	return -ENOMEM;
}

/**
 * ibmvfc_probe - Adapter hot plug add entry point
 * @vdev:	vio device struct
 * @id:	vio device id struct
 *
 * Return value:
 * 	0 on success / non-zero on failure
 **/
static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
{
	struct ibmvfc_host *vhost;
	struct Scsi_Host *shost;
	struct device *dev = &vdev->dev;
	int rc = -ENOMEM;

	ENTER;
	shost = scsi_host_alloc(&driver_template, sizeof(*vhost));
	if (!shost) {
		dev_err(dev, "Couldn't allocate host data\n");
		goto out;
	}

	shost->transportt = ibmvfc_transport_template;
	shost->can_queue = max_requests;
	shost->max_lun = max_lun;
	shost->max_id = max_targets;
	shost->max_sectors = IBMVFC_MAX_SECTORS;
	shost->max_cmd_len = IBMVFC_MAX_CDB_LEN;
	shost->unique_id = shost->host_no;

	vhost = shost_priv(shost);
	INIT_LIST_HEAD(&vhost->sent);
	INIT_LIST_HEAD(&vhost->free);
	INIT_LIST_HEAD(&vhost->targets);
	sprintf(vhost->name, IBMVFC_NAME);
	vhost->host = shost;
	vhost->dev = dev;
	vhost->partition_number = -1;
	vhost->log_level = log_level;
4159
	vhost->task_set = 1;
4160 4161 4162 4163 4164 4165 4166 4167 4168 4169 4170 4171 4172 4173 4174 4175 4176 4177 4178 4179 4180 4181 4182 4183 4184 4185 4186 4187 4188 4189 4190 4191 4192 4193 4194 4195 4196 4197 4198 4199 4200 4201 4202 4203 4204 4205 4206 4207 4208 4209 4210 4211 4212 4213 4214 4215 4216 4217 4218 4219 4220 4221 4222 4223 4224 4225 4226 4227 4228 4229 4230 4231 4232 4233 4234
	strcpy(vhost->partition_name, "UNKNOWN");
	init_waitqueue_head(&vhost->work_wait_q);
	init_waitqueue_head(&vhost->init_wait_q);

	if ((rc = ibmvfc_alloc_mem(vhost)))
		goto free_scsi_host;

	vhost->work_thread = kthread_run(ibmvfc_work, vhost, "%s_%d", IBMVFC_NAME,
					 shost->host_no);

	if (IS_ERR(vhost->work_thread)) {
		dev_err(dev, "Couldn't create kernel thread: %ld\n",
			PTR_ERR(vhost->work_thread));
		goto free_host_mem;
	}

	if ((rc = ibmvfc_init_crq(vhost))) {
		dev_err(dev, "Couldn't initialize crq. rc=%d\n", rc);
		goto kill_kthread;
	}

	if ((rc = ibmvfc_init_event_pool(vhost))) {
		dev_err(dev, "Couldn't initialize event pool. rc=%d\n", rc);
		goto release_crq;
	}

	if ((rc = scsi_add_host(shost, dev)))
		goto release_event_pool;

	if ((rc = ibmvfc_create_trace_file(&shost->shost_dev.kobj,
					   &ibmvfc_trace_attr))) {
		dev_err(dev, "Failed to create trace file. rc=%d\n", rc);
		goto remove_shost;
	}

	dev_set_drvdata(dev, vhost);
	spin_lock(&ibmvfc_driver_lock);
	list_add_tail(&vhost->queue, &ibmvfc_head);
	spin_unlock(&ibmvfc_driver_lock);

	ibmvfc_send_crq_init(vhost);
	scsi_scan_host(shost);
	return 0;

remove_shost:
	scsi_remove_host(shost);
release_event_pool:
	ibmvfc_free_event_pool(vhost);
release_crq:
	ibmvfc_release_crq_queue(vhost);
kill_kthread:
	kthread_stop(vhost->work_thread);
free_host_mem:
	ibmvfc_free_mem(vhost);
free_scsi_host:
	scsi_host_put(shost);
out:
	LEAVE;
	return rc;
}

/**
 * ibmvfc_remove - Adapter hot plug remove entry point
 * @vdev:	vio device struct
 *
 * Return value:
 * 	0
 **/
static int ibmvfc_remove(struct vio_dev *vdev)
{
	struct ibmvfc_host *vhost = dev_get_drvdata(&vdev->dev);
	unsigned long flags;

	ENTER;
	ibmvfc_remove_trace_file(&vhost->host->shost_dev.kobj, &ibmvfc_trace_attr);
4235 4236 4237
	ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
	ibmvfc_wait_while_resetting(vhost);
	ibmvfc_release_crq_queue(vhost);
4238 4239 4240 4241 4242 4243 4244 4245 4246 4247 4248 4249 4250 4251 4252 4253 4254 4255
	kthread_stop(vhost->work_thread);
	fc_remove_host(vhost->host);
	scsi_remove_host(vhost->host);

	spin_lock_irqsave(vhost->host->host_lock, flags);
	ibmvfc_purge_requests(vhost, DID_ERROR);
	ibmvfc_free_event_pool(vhost);
	spin_unlock_irqrestore(vhost->host->host_lock, flags);

	ibmvfc_free_mem(vhost);
	spin_lock(&ibmvfc_driver_lock);
	list_del(&vhost->queue);
	spin_unlock(&ibmvfc_driver_lock);
	scsi_host_put(vhost->host);
	LEAVE;
	return 0;
}

4256 4257 4258 4259 4260 4261 4262 4263 4264 4265 4266 4267 4268 4269
/**
 * ibmvfc_get_desired_dma - Calculate DMA resources needed by the driver
 * @vdev:	vio device struct
 *
 * Return value:
 *	Number of bytes the driver will need to DMA map at the same time in
 *	order to perform well.
 */
static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev)
{
	unsigned long pool_dma = max_requests * sizeof(union ibmvfc_iu);
	return pool_dma + ((512 * 1024) * driver_template.cmd_per_lun);
}

4270 4271 4272 4273 4274 4275 4276 4277 4278 4279
static struct vio_device_id ibmvfc_device_table[] __devinitdata = {
	{"fcp", "IBM,vfc-client"},
	{ "", "" }
};
MODULE_DEVICE_TABLE(vio, ibmvfc_device_table);

static struct vio_driver ibmvfc_driver = {
	.id_table = ibmvfc_device_table,
	.probe = ibmvfc_probe,
	.remove = ibmvfc_remove,
4280
	.get_desired_dma = ibmvfc_get_desired_dma,
4281 4282 4283 4284 4285 4286 4287 4288 4289 4290 4291 4292 4293
	.driver = {
		.name = IBMVFC_NAME,
		.owner = THIS_MODULE,
	}
};

static struct fc_function_template ibmvfc_transport_functions = {
	.show_host_fabric_name = 1,
	.show_host_node_name = 1,
	.show_host_port_name = 1,
	.show_host_supported_classes = 1,
	.show_host_port_type = 1,
	.show_host_port_id = 1,
4294
	.show_host_maxframe_size = 1,
4295 4296 4297 4298 4299 4300 4301 4302 4303 4304 4305 4306 4307 4308 4309 4310 4311 4312 4313 4314 4315 4316 4317 4318 4319 4320 4321 4322 4323 4324 4325 4326 4327 4328 4329 4330 4331 4332 4333 4334 4335 4336 4337 4338 4339 4340 4341 4342 4343 4344 4345 4346 4347 4348 4349 4350 4351 4352 4353 4354 4355 4356 4357 4358 4359 4360

	.get_host_port_state = ibmvfc_get_host_port_state,
	.show_host_port_state = 1,

	.get_host_speed = ibmvfc_get_host_speed,
	.show_host_speed = 1,

	.issue_fc_host_lip = ibmvfc_issue_fc_host_lip,
	.terminate_rport_io = ibmvfc_terminate_rport_io,

	.show_rport_maxframe_size = 1,
	.show_rport_supported_classes = 1,

	.set_rport_dev_loss_tmo = ibmvfc_set_rport_dev_loss_tmo,
	.show_rport_dev_loss_tmo = 1,

	.get_starget_node_name = ibmvfc_get_starget_node_name,
	.show_starget_node_name = 1,

	.get_starget_port_name = ibmvfc_get_starget_port_name,
	.show_starget_port_name = 1,

	.get_starget_port_id = ibmvfc_get_starget_port_id,
	.show_starget_port_id = 1,
};

/**
 * ibmvfc_module_init - Initialize the ibmvfc module
 *
 * Return value:
 * 	0 on success / other on failure
 **/
static int __init ibmvfc_module_init(void)
{
	int rc;

	if (!firmware_has_feature(FW_FEATURE_VIO))
		return -ENODEV;

	printk(KERN_INFO IBMVFC_NAME": IBM Virtual Fibre Channel Driver version: %s %s\n",
	       IBMVFC_DRIVER_VERSION, IBMVFC_DRIVER_DATE);

	ibmvfc_transport_template = fc_attach_transport(&ibmvfc_transport_functions);
	if (!ibmvfc_transport_template)
		return -ENOMEM;

	rc = vio_register_driver(&ibmvfc_driver);
	if (rc)
		fc_release_transport(ibmvfc_transport_template);
	return rc;
}

/**
 * ibmvfc_module_exit - Teardown the ibmvfc module
 *
 * Return value:
 * 	nothing
 **/
static void __exit ibmvfc_module_exit(void)
{
	vio_unregister_driver(&ibmvfc_driver);
	fc_release_transport(ibmvfc_transport_template);
}

module_init(ibmvfc_module_init);
module_exit(ibmvfc_module_exit);