ibmvfc.c 137.5 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>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include <linux/pm.h>
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#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>
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#include <scsi/scsi_bsg_fc.h>
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#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 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(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" },
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	{ IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_HALTED, DID_REQUEUE, 1, 0, "link halted" },
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	{ 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 *);
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static void ibmvfc_npiv_logout(struct ibmvfc_host *);
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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:
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		if (action == IBMVFC_TGT_ACTION_DELETED_RPORT)
			tgt->action = action;
	case IBMVFC_TGT_ACTION_DELETED_RPORT:
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		break;
	default:
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		if (action == IBMVFC_TGT_ACTION_DEL_RPORT)
			tgt->add_rport = 0;
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		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;
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	case IBMVFC_HOST_ACTION_LOGO_WAIT:
		if (vhost->action == IBMVFC_HOST_ACTION_LOGO)
			vhost->action = action;
		break;
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	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:
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		case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
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			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:
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		switch (vhost->action) {
		case IBMVFC_HOST_ACTION_RESET:
		case IBMVFC_HOST_ACTION_REENABLE:
			break;
		default:
			vhost->action = action;
			break;
		};
		break;
	case IBMVFC_HOST_ACTION_LOGO:
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	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_NONE:
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	case IBMVFC_HOST_ACTION_RESET:
	case IBMVFC_HOST_ACTION_REENABLE:
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	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
 *
 * Return value:
 *	nothing
 **/
576
static void ibmvfc_init_host(struct ibmvfc_host *vhost)
577 578 579 580
{
	struct ibmvfc_target *tgt;

	if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
581
		if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
582 583 584 585 586 587 588 589
			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)) {
590 591
		memset(vhost->async_crq.msgs, 0, PAGE_SIZE);
		vhost->async_crq.cur = 0;
592

593
		list_for_each_entry(tgt, &vhost->targets, queue)
594
			ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651
		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)
{
652
	long rc = 0;
653 654 655 656 657
	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);
658
	tasklet_kill(&vhost->tasklet);
659
	do {
660 661
		if (rc)
			msleep(100);
662 663 664 665
		rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
	} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));

	vhost->state = IBMVFC_NO_CRQ;
666
	vhost->logged_in = 0;
667 668 669 670 671 672 673 674 675 676 677 678 679
	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)
{
680
	int rc = 0;
681 682 683 684
	struct vio_dev *vdev = to_vio_dev(vhost->dev);

	/* Re-enable the CRQ */
	do {
685 686
		if (rc)
			msleep(100);
687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704
		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)
{
705 706
	int rc = 0;
	unsigned long flags;
707 708 709 710 711
	struct vio_dev *vdev = to_vio_dev(vhost->dev);
	struct ibmvfc_crq_queue *crq = &vhost->crq;

	/* Close the CRQ */
	do {
712 713
		if (rc)
			msleep(100);
714 715 716
		rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
	} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));

717
	spin_lock_irqsave(vhost->host->host_lock, flags);
718
	vhost->state = IBMVFC_NO_CRQ;
719
	vhost->logged_in = 0;
720 721 722 723 724 725 726 727 728 729 730 731 732 733 734
	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);
735
	spin_unlock_irqrestore(vhost->host->host_lock, flags);
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	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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790 791 792
	if (evt->eh_comp)
		complete(evt->eh_comp);

793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835
	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);
}

/**
836
 * ibmvfc_hard_reset_host - Reset the connection to the server by breaking the CRQ
837 838
 * @vhost:	struct ibmvfc host to reset
 **/
839
static void ibmvfc_hard_reset_host(struct ibmvfc_host *vhost)
840 841
{
	ibmvfc_purge_requests(vhost, DID_ERROR);
842 843
	ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
	ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
844 845 846
}

/**
847
 * __ibmvfc_reset_host - Reset the connection to the server (no locking)
848 849
 * @vhost:	struct ibmvfc host to reset
 **/
850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865
static void __ibmvfc_reset_host(struct ibmvfc_host *vhost)
{
	if (vhost->logged_in && vhost->action != IBMVFC_HOST_ACTION_LOGO_WAIT &&
	    !ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
		scsi_block_requests(vhost->host);
		ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO);
		vhost->job_step = ibmvfc_npiv_logout;
		wake_up(&vhost->work_wait_q);
	} else
		ibmvfc_hard_reset_host(vhost);
}

/**
 * ibmvfc_reset_host - Reset the connection to the server
 * @vhost:	ibmvfc host struct
 **/
866 867 868 869 870 871 872 873 874 875 876 877 878
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
 *
879 880
 * Returns: 1 if init will be retried / 0 if not
 *
881
 **/
882
static int ibmvfc_retry_host_init(struct ibmvfc_host *vhost)
883
{
884 885
	int retry = 0;

886
	if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
887 888
		vhost->delay_init = 1;
		if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
889 890 891
			dev_err(vhost->dev,
				"Host initialization retries exceeded. Taking adapter offline\n");
			ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
892
		} else if (vhost->init_retries == IBMVFC_MAX_HOST_INIT_RETRIES)
893
			__ibmvfc_reset_host(vhost);
894
		else {
895
			ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
896 897
			retry = 1;
		}
898 899 900
	}

	wake_up(&vhost->work_wait_q);
901
	return retry;
902 903 904
}

/**
905
 * __ibmvfc_get_target - Find the specified scsi_target (no locking)
906 907 908 909 910
 * @starget:	scsi target struct
 *
 * Return value:
 *	ibmvfc_target struct / NULL if not found
 **/
911
static struct ibmvfc_target *__ibmvfc_get_target(struct scsi_target *starget)
912 913 914 915 916 917
{
	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)
918 919
		if (tgt->target_id == starget->id) {
			kref_get(&tgt->kref);
920
			return tgt;
921
		}
922 923 924 925
	return NULL;
}

/**
926
 * ibmvfc_get_target - Find the specified scsi_target
927 928 929 930 931
 * @starget:	scsi target struct
 *
 * Return value:
 *	ibmvfc_target struct / NULL if not found
 **/
932
static struct ibmvfc_target *ibmvfc_get_target(struct scsi_target *starget)
933 934 935 936 937 938
{
	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
	struct ibmvfc_target *tgt;
	unsigned long flags;

	spin_lock_irqsave(shost->host_lock, flags);
939
	tgt = __ibmvfc_get_target(starget);
940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977
	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:
978
			ibmvfc_log(vhost, 3, "Unknown port speed: %lld Gbit\n",
979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015
				   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;
1016 1017 1018
	case IBMVFC_NO_CRQ:
		fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
		break;
1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042
	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;
}

1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053
/**
 * 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);
}

1054 1055 1056 1057 1058 1059 1060 1061 1062
/**
 * 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)
{
1063
	struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1064
	fc_starget_port_name(starget) = tgt ? tgt->ids.node_name : 0;
1065 1066
	if (tgt)
		kref_put(&tgt->kref, ibmvfc_release_tgt);
1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077
}

/**
 * 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)
{
1078
	struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1079
	fc_starget_port_name(starget) = tgt ? tgt->ids.port_name : 0;
1080 1081
	if (tgt)
		kref_put(&tgt->kref, ibmvfc_release_tgt);
1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092
}

/**
 * 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)
{
1093
	struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1094
	fc_starget_port_id(starget) = tgt ? tgt->scsi_id : -1;
1095 1096
	if (tgt)
		kref_put(&tgt->kref, ibmvfc_release_tgt);
1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108
}

/**
 * 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,
1109 1110 1111 1112
					  ((vhost->state == IBMVFC_ACTIVE ||
					    vhost->state == IBMVFC_HOST_OFFLINE ||
					    vhost->state == IBMVFC_LINK_DEAD) &&
					   vhost->action == IBMVFC_HOST_ACTION_NONE),
1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168
					  (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;
1169
	struct device_node *of_node = vhost->dev->of_node;
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	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;
1181
	login_info->flags = IBMVFC_FLUSH_ON_HALT;
1182
	if (vhost->client_migrated)
1183
		login_info->flags |= IBMVFC_CLIENT_MIGRATED;
1184 1185 1186 1187

	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,
1191
		dev_name(&vhost->host->shost_gendev), IBMVFC_MAX_NAME);
1192 1193

	location = of_get_property(of_node, "ibm,loc-code", NULL);
1194
	location = location ? location : dev_name(vhost->dev);
1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296
	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) {
1368 1369 1370
			scsi_dma_unmap(scmd);
			if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
				scmd_printk(KERN_ERR, scmd, "Can't allocate memory for scatterlist\n");
1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428
			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;
	}

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	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);
}

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/**
 * ibmvfc_relogin - Log back into the specified device
 * @sdev:	scsi device struct
 *
 **/
static void ibmvfc_relogin(struct scsi_device *sdev)
{
	struct ibmvfc_host *vhost = shost_priv(sdev->host);
	struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
	struct ibmvfc_target *tgt;

	list_for_each_entry(tgt, &vhost->targets, queue) {
		if (rport == tgt->rport) {
			ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
			break;
		}
	}

	ibmvfc_reinit_host(vhost);
}

1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527
/**
 * 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;
1528 1529
	u32 rsp_len = 0;
	u32 sense_len = rsp->fcp_sense_len;
1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545

	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;
1546
			if ((rsp->flags & FCP_SNS_LEN_VALID) && rsp->fcp_sense_len && rsp_len <= 8)
1547
				memcpy(cmnd->sense_buffer, rsp->data.sense + rsp_len, sense_len);
1548
			if ((vfc_cmd->status & IBMVFC_VIOS_FAILURE) && (vfc_cmd->error == IBMVFC_PLOGI_REQUIRED))
1549
				ibmvfc_relogin(cmnd->device);
1550

1551 1552 1553
			if (!cmnd->result && (!scsi_get_resid(cmnd) || (rsp->flags & FCP_RESID_OVER)))
				cmnd->result = (DID_ERROR << 16);

1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564
			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
 **/
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static int ibmvfc_queuecommand_lck(struct scsi_cmnd *cmnd,
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			       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;
}

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static DEF_SCSI_QCMD(ibmvfc_queuecommand)

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/**
 * 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);
}

1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 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 1841 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 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 1957 1958 1959 1960
/**
 * ibmvfc_bsg_timeout_done - Completion handler for cancelling BSG commands
 * @evt:	struct ibmvfc_event
 *
 **/
static void ibmvfc_bsg_timeout_done(struct ibmvfc_event *evt)
{
	struct ibmvfc_host *vhost = evt->vhost;

	ibmvfc_free_event(evt);
	vhost->aborting_passthru = 0;
	dev_info(vhost->dev, "Passthru command cancelled\n");
}

/**
 * ibmvfc_bsg_timeout - Handle a BSG timeout
 * @job:	struct fc_bsg_job that timed out
 *
 * Returns:
 *	0 on success / other on failure
 **/
static int ibmvfc_bsg_timeout(struct fc_bsg_job *job)
{
	struct ibmvfc_host *vhost = shost_priv(job->shost);
	unsigned long port_id = (unsigned long)job->dd_data;
	struct ibmvfc_event *evt;
	struct ibmvfc_tmf *tmf;
	unsigned long flags;
	int rc;

	ENTER;
	spin_lock_irqsave(vhost->host->host_lock, flags);
	if (vhost->aborting_passthru || vhost->state != IBMVFC_ACTIVE) {
		__ibmvfc_reset_host(vhost);
		spin_unlock_irqrestore(vhost->host->host_lock, flags);
		return 0;
	}

	vhost->aborting_passthru = 1;
	evt = ibmvfc_get_event(vhost);
	ibmvfc_init_event(evt, ibmvfc_bsg_timeout_done, 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 = port_id;
	tmf->cancel_key = IBMVFC_PASSTHRU_CANCEL_KEY;
	tmf->my_cancel_key = IBMVFC_INTERNAL_CANCEL_KEY;
	rc = ibmvfc_send_event(evt, vhost, default_timeout);

	if (rc != 0) {
		vhost->aborting_passthru = 0;
		dev_err(vhost->dev, "Failed to send cancel event. rc=%d\n", rc);
		rc = -EIO;
	} else
		dev_info(vhost->dev, "Cancelling passthru command to port id 0x%lx\n",
			 port_id);

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

	LEAVE;
	return rc;
}

/**
 * ibmvfc_bsg_plogi - PLOGI into a target to handle a BSG command
 * @vhost:		struct ibmvfc_host to send command
 * @port_id:	port ID to send command
 *
 * Returns:
 *	0 on success / other on failure
 **/
static int ibmvfc_bsg_plogi(struct ibmvfc_host *vhost, unsigned int port_id)
{
	struct ibmvfc_port_login *plogi;
	struct ibmvfc_target *tgt;
	struct ibmvfc_event *evt;
	union ibmvfc_iu rsp_iu;
	unsigned long flags;
	int rc = 0, issue_login = 1;

	ENTER;
	spin_lock_irqsave(vhost->host->host_lock, flags);
	list_for_each_entry(tgt, &vhost->targets, queue) {
		if (tgt->scsi_id == port_id) {
			issue_login = 0;
			break;
		}
	}

	if (!issue_login)
		goto unlock_out;
	if (unlikely((rc = ibmvfc_host_chkready(vhost))))
		goto unlock_out;

	evt = ibmvfc_get_event(vhost);
	ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
	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 = port_id;
	evt->sync_iu = &rsp_iu;
	init_completion(&evt->comp);

	rc = ibmvfc_send_event(evt, vhost, default_timeout);
	spin_unlock_irqrestore(vhost->host->host_lock, flags);

	if (rc)
		return -EIO;

	wait_for_completion(&evt->comp);

	if (rsp_iu.plogi.common.status)
		rc = -EIO;

	spin_lock_irqsave(vhost->host->host_lock, flags);
	ibmvfc_free_event(evt);
unlock_out:
	spin_unlock_irqrestore(vhost->host->host_lock, flags);
	LEAVE;
	return rc;
}

/**
 * ibmvfc_bsg_request - Handle a BSG request
 * @job:	struct fc_bsg_job to be executed
 *
 * Returns:
 *	0 on success / other on failure
 **/
static int ibmvfc_bsg_request(struct fc_bsg_job *job)
{
	struct ibmvfc_host *vhost = shost_priv(job->shost);
	struct fc_rport *rport = job->rport;
	struct ibmvfc_passthru_mad *mad;
	struct ibmvfc_event *evt;
	union ibmvfc_iu rsp_iu;
	unsigned long flags, port_id = -1;
	unsigned int code = job->request->msgcode;
	int rc = 0, req_seg, rsp_seg, issue_login = 0;
	u32 fc_flags, rsp_len;

	ENTER;
	job->reply->reply_payload_rcv_len = 0;
	if (rport)
		port_id = rport->port_id;

	switch (code) {
	case FC_BSG_HST_ELS_NOLOGIN:
		port_id = (job->request->rqst_data.h_els.port_id[0] << 16) |
			(job->request->rqst_data.h_els.port_id[1] << 8) |
			job->request->rqst_data.h_els.port_id[2];
	case FC_BSG_RPT_ELS:
		fc_flags = IBMVFC_FC_ELS;
		break;
	case FC_BSG_HST_CT:
		issue_login = 1;
		port_id = (job->request->rqst_data.h_ct.port_id[0] << 16) |
			(job->request->rqst_data.h_ct.port_id[1] << 8) |
			job->request->rqst_data.h_ct.port_id[2];
	case FC_BSG_RPT_CT:
		fc_flags = IBMVFC_FC_CT_IU;
		break;
	default:
		return -ENOTSUPP;
	};

	if (port_id == -1)
		return -EINVAL;
	if (!mutex_trylock(&vhost->passthru_mutex))
		return -EBUSY;

	job->dd_data = (void *)port_id;
	req_seg = dma_map_sg(vhost->dev, job->request_payload.sg_list,
			     job->request_payload.sg_cnt, DMA_TO_DEVICE);

	if (!req_seg) {
		mutex_unlock(&vhost->passthru_mutex);
		return -ENOMEM;
	}

	rsp_seg = dma_map_sg(vhost->dev, job->reply_payload.sg_list,
			     job->reply_payload.sg_cnt, DMA_FROM_DEVICE);

	if (!rsp_seg) {
		dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
			     job->request_payload.sg_cnt, DMA_TO_DEVICE);
		mutex_unlock(&vhost->passthru_mutex);
		return -ENOMEM;
	}

	if (req_seg > 1 || rsp_seg > 1) {
		rc = -EINVAL;
		goto out;
	}

	if (issue_login)
		rc = ibmvfc_bsg_plogi(vhost, port_id);

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

	if (unlikely(rc || (rport && (rc = fc_remote_port_chkready(rport)))) ||
	    unlikely((rc = ibmvfc_host_chkready(vhost)))) {
		spin_unlock_irqrestore(vhost->host->host_lock, flags);
		goto out;
	}

	evt = ibmvfc_get_event(vhost);
	ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
	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 = job->request_payload.payload_len;
	mad->iu.rsp_len = job->reply_payload.payload_len;
	mad->iu.flags = fc_flags;
	mad->iu.cancel_key = IBMVFC_PASSTHRU_CANCEL_KEY;

	mad->iu.cmd.va = sg_dma_address(job->request_payload.sg_list);
	mad->iu.cmd.len = sg_dma_len(job->request_payload.sg_list);
	mad->iu.rsp.va = sg_dma_address(job->reply_payload.sg_list);
	mad->iu.rsp.len = sg_dma_len(job->reply_payload.sg_list);
	mad->iu.scsi_id = port_id;
	mad->iu.tag = (u64)evt;
	rsp_len = mad->iu.rsp.len;

	evt->sync_iu = &rsp_iu;
	init_completion(&evt->comp);
	rc = ibmvfc_send_event(evt, vhost, 0);
	spin_unlock_irqrestore(vhost->host->host_lock, flags);

	if (rc) {
		rc = -EIO;
		goto out;
	}

	wait_for_completion(&evt->comp);

	if (rsp_iu.passthru.common.status)
		rc = -EIO;
	else
		job->reply->reply_payload_rcv_len = rsp_len;

	spin_lock_irqsave(vhost->host->host_lock, flags);
	ibmvfc_free_event(evt);
	spin_unlock_irqrestore(vhost->host->host_lock, flags);
	job->reply->result = rc;
	job->job_done(job);
	rc = 0;
out:
	dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
		     job->request_payload.sg_cnt, DMA_TO_DEVICE);
	dma_unmap_sg(vhost->dev, job->reply_payload.sg_list,
		     job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
	mutex_unlock(&vhost->passthru_mutex);
	LEAVE;
	return rc;
}

1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974
/**
 * 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;
1975
	struct ibmvfc_event *evt = NULL;
1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014
	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);

2015 2016 2017 2018
	if (rsp_iu.cmd.status)
		rsp_code = ibmvfc_get_err_result(&rsp_iu.cmd);

	if (rsp_code) {
2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037
		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;
}

/**
2038 2039 2040
 * ibmvfc_match_rport - Match function for specified remote port
 * @evt:	ibmvfc event struct
 * @device:	device to match (rport)
2041 2042
 *
 * Returns:
2043
 *	1 if event matches rport / 0 if event does not match rport
2044
 **/
2045
static int ibmvfc_match_rport(struct ibmvfc_event *evt, void *rport)
2046
{
2047
	struct fc_rport *cmd_rport;
2048

2049 2050 2051 2052
	if (evt->cmnd) {
		cmd_rport = starget_to_rport(scsi_target(evt->cmnd->device));
		if (cmd_rport == rport)
			return 1;
2053
	}
2054 2055
	return 0;
}
2056

2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070
/**
 * 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;
}
2071

2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085
/**
 * 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;
}
2086

2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103
/**
 * 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 = IBMVFC_ABORT_WAIT_TIMEOUT * HZ;
2104

2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115
	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);
2116

2117 2118
		if (wait) {
			timeout = wait_for_completion_timeout(&comp, timeout);
2119

2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136
			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);
2137

2138 2139
	LEAVE;
	return SUCCESS;
2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155
}

/**
 * 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);
2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181
	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;
	}

2182
	if (vhost->logged_in) {
2183 2184 2185 2186 2187 2188 2189 2190 2191 2192
		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);
2193 2194
		if (!(vhost->login_buf->resp.capabilities & IBMVFC_CAN_SUPPRESS_ABTS))
			type &= ~IBMVFC_TMF_SUPPRESS_ABTS;
2195 2196 2197
		if (vhost->state == IBMVFC_ACTIVE)
			tmf->flags = (type | IBMVFC_TMF_LUA_VALID);
		else
2198
			tmf->flags = ((type & IBMVFC_TMF_SUPPRESS_ABTS) | IBMVFC_TMF_LUA_VALID);
2199
		tmf->cancel_key = (unsigned long)sdev->hostdata;
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		tmf->my_cancel_key = (unsigned long)starget->hostdata;
2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230

		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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2231
/**
2232
 * ibmvfc_match_key - Match function for specified cancel key
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2233
 * @evt:	ibmvfc event struct
2234
 * @key:	cancel key to match
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2235 2236
 *
 * Returns:
2237
 *	1 if event matches key / 0 if event does not match key
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2238
 **/
2239
static int ibmvfc_match_key(struct ibmvfc_event *evt, void *key)
B
Brian King 已提交
2240
{
2241
	unsigned long cancel_key = (unsigned long)key;
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Brian King 已提交
2242

2243 2244
	if (evt->crq.format == IBMVFC_CMD_FORMAT &&
	    evt->iu.cmd.cancel_key == cancel_key)
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2245 2246 2247 2248
		return 1;
	return 0;
}

2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263
/**
 * ibmvfc_match_evt - Match function for specified event
 * @evt:	ibmvfc event struct
 * @match:	event to match
 *
 * Returns:
 *	1 if event matches key / 0 if event does not match key
 **/
static int ibmvfc_match_evt(struct ibmvfc_event *evt, void *match)
{
	if (evt == match)
		return 1;
	return 0;
}

B
Brian King 已提交
2264
/**
2265 2266 2267 2268 2269
 * 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.
B
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2270 2271
 *
 * Returns:
2272
 *	0 on success / other on failure
B
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2273
 **/
2274
static int ibmvfc_abort_task_set(struct scsi_device *sdev)
B
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2275
{
2276 2277 2278 2279 2280 2281 2282 2283 2284
	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 rc, rsp_rc = -EBUSY;
	unsigned long flags, timeout = IBMVFC_ABORT_TIMEOUT;
	int rsp_code = 0;
B
Brian King 已提交
2285

2286 2287 2288 2289 2290 2291
	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;
B
Brian King 已提交
2292
		}
2293 2294 2295 2296 2297
	}

	if (!found_evt) {
		if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
			sdev_printk(KERN_INFO, sdev, "No events found to abort\n");
B
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2298
		spin_unlock_irqrestore(vhost->host->host_lock, flags);
2299 2300
		return 0;
	}
B
Brian King 已提交
2301

2302 2303 2304
	if (vhost->state == IBMVFC_ACTIVE) {
		evt = ibmvfc_get_event(vhost);
		ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
B
Brian King 已提交
2305

2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334
		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");
	timeout = wait_for_completion_timeout(&evt->comp, timeout);

	if (!timeout) {
2335
		rc = ibmvfc_cancel_all(sdev, 0);
2336 2337 2338 2339
		if (!rc) {
			rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);
			if (rc == SUCCESS)
				rc = 0;
B
Brian King 已提交
2340 2341
		}

2342 2343 2344
		if (rc) {
			sdev_printk(KERN_INFO, sdev, "Cancel failed, resetting host\n");
			ibmvfc_reset_host(vhost);
2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358
			rsp_rc = -EIO;
			rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);

			if (rc == SUCCESS)
				rsp_rc = 0;

			rc = ibmvfc_wait_for_ops(vhost, evt, ibmvfc_match_evt);
			if (rc != SUCCESS) {
				spin_lock_irqsave(vhost->host->host_lock, flags);
				ibmvfc_hard_reset_host(vhost);
				spin_unlock_irqrestore(vhost->host->host_lock, flags);
				rsp_rc = 0;
			}

2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383
			goto out;
		}
	}

	if (rsp_iu.cmd.status)
		rsp_code = ibmvfc_get_err_result(&rsp_iu.cmd);

	if (rsp_code) {
		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");

out:
	spin_lock_irqsave(vhost->host->host_lock, flags);
	ibmvfc_free_event(evt);
	spin_unlock_irqrestore(vhost->host->host_lock, flags);
	return rsp_rc;
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2384 2385
}

2386 2387 2388 2389 2390
/**
 * ibmvfc_eh_abort_handler - Abort a command
 * @cmd:	scsi command to abort
 *
 * Returns:
2391
 *	SUCCESS / FAST_IO_FAIL / FAILED
2392 2393 2394
 **/
static int ibmvfc_eh_abort_handler(struct scsi_cmnd *cmd)
{
B
Brian King 已提交
2395 2396
	struct scsi_device *sdev = cmd->device;
	struct ibmvfc_host *vhost = shost_priv(sdev->host);
2397
	int cancel_rc, block_rc;
B
Brian King 已提交
2398
	int rc = FAILED;
2399 2400

	ENTER;
2401
	block_rc = fc_block_scsi_eh(cmd);
2402
	ibmvfc_wait_while_resetting(vhost);
2403 2404
	if (block_rc != FAST_IO_FAIL) {
		cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET);
2405
		ibmvfc_abort_task_set(sdev);
2406
	} else
2407
		cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2408

2409
	if (!cancel_rc)
B
Brian King 已提交
2410
		rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2411

2412 2413 2414
	if (block_rc == FAST_IO_FAIL && rc != FAILED)
		rc = FAST_IO_FAIL;

2415
	LEAVE;
B
Brian King 已提交
2416
	return rc;
2417 2418 2419 2420 2421 2422 2423
}

/**
 * ibmvfc_eh_device_reset_handler - Reset a single LUN
 * @cmd:	scsi command struct
 *
 * Returns:
2424
 *	SUCCESS / FAST_IO_FAIL / FAILED
2425 2426 2427
 **/
static int ibmvfc_eh_device_reset_handler(struct scsi_cmnd *cmd)
{
B
Brian King 已提交
2428 2429
	struct scsi_device *sdev = cmd->device;
	struct ibmvfc_host *vhost = shost_priv(sdev->host);
2430
	int cancel_rc, block_rc, reset_rc = 0;
B
Brian King 已提交
2431
	int rc = FAILED;
2432 2433

	ENTER;
2434
	block_rc = fc_block_scsi_eh(cmd);
2435
	ibmvfc_wait_while_resetting(vhost);
2436 2437 2438 2439
	if (block_rc != FAST_IO_FAIL) {
		cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_LUN_RESET);
		reset_rc = ibmvfc_reset_device(sdev, IBMVFC_LUN_RESET, "LUN");
	} else
2440
		cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2441

B
Brian King 已提交
2442 2443
	if (!cancel_rc && !reset_rc)
		rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2444

2445 2446 2447
	if (block_rc == FAST_IO_FAIL && rc != FAILED)
		rc = FAST_IO_FAIL;

2448
	LEAVE;
B
Brian King 已提交
2449
	return rc;
2450 2451
}

2452 2453 2454 2455 2456 2457 2458 2459 2460
/**
 * ibmvfc_dev_cancel_all_noreset - Device iterated cancel all function
 * @sdev:	scsi device struct
 * @data:	return code
 *
 **/
static void ibmvfc_dev_cancel_all_noreset(struct scsi_device *sdev, void *data)
{
	unsigned long *rc = data;
2461
	*rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2462 2463
}

2464 2465 2466 2467 2468 2469 2470
/**
 * ibmvfc_dev_cancel_all_reset - Device iterated cancel all function
 * @sdev:	scsi device struct
 * @data:	return code
 *
 **/
static void ibmvfc_dev_cancel_all_reset(struct scsi_device *sdev, void *data)
2471 2472 2473 2474 2475 2476 2477 2478 2479 2480
{
	unsigned long *rc = data;
	*rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_TGT_RESET);
}

/**
 * ibmvfc_eh_target_reset_handler - Reset the target
 * @cmd:	scsi command struct
 *
 * Returns:
2481
 *	SUCCESS / FAST_IO_FAIL / FAILED
2482 2483 2484
 **/
static int ibmvfc_eh_target_reset_handler(struct scsi_cmnd *cmd)
{
B
Brian King 已提交
2485 2486 2487
	struct scsi_device *sdev = cmd->device;
	struct ibmvfc_host *vhost = shost_priv(sdev->host);
	struct scsi_target *starget = scsi_target(sdev);
2488 2489
	int block_rc;
	int reset_rc = 0;
B
Brian King 已提交
2490
	int rc = FAILED;
2491 2492 2493
	unsigned long cancel_rc = 0;

	ENTER;
2494
	block_rc = fc_block_scsi_eh(cmd);
2495
	ibmvfc_wait_while_resetting(vhost);
2496 2497 2498 2499 2500
	if (block_rc != FAST_IO_FAIL) {
		starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all_reset);
		reset_rc = ibmvfc_reset_device(sdev, IBMVFC_TARGET_RESET, "target");
	} else
		starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all_noreset);
2501

B
Brian King 已提交
2502 2503
	if (!cancel_rc && !reset_rc)
		rc = ibmvfc_wait_for_ops(vhost, starget, ibmvfc_match_target);
2504

2505 2506 2507
	if (block_rc == FAST_IO_FAIL && rc != FAILED)
		rc = FAST_IO_FAIL;

2508
	LEAVE;
B
Brian King 已提交
2509
	return rc;
2510 2511 2512 2513 2514 2515 2516 2517 2518
}

/**
 * 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)
{
2519
	int rc, block_rc;
2520 2521
	struct ibmvfc_host *vhost = shost_priv(cmd->device->host);

2522
	block_rc = fc_block_scsi_eh(cmd);
2523 2524
	dev_err(vhost->dev, "Resetting connection due to error recovery\n");
	rc = ibmvfc_issue_fc_host_lip(vhost->host);
2525 2526 2527 2528

	if (block_rc == FAST_IO_FAIL)
		return FAST_IO_FAIL;

2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540
	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)
{
2541
	struct Scsi_Host *shost = rport_to_shost(rport);
2542
	struct ibmvfc_host *vhost = shost_priv(shost);
2543 2544 2545
	struct fc_rport *dev_rport;
	struct scsi_device *sdev;
	unsigned long rc;
2546 2547

	ENTER;
2548 2549 2550 2551
	shost_for_each_device(sdev, shost) {
		dev_rport = starget_to_rport(scsi_target(sdev));
		if (dev_rport != rport)
			continue;
2552
		ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2553
	}
2554

2555
	rc = ibmvfc_wait_for_ops(vhost, rport, ibmvfc_match_rport);
B
Brian King 已提交
2556 2557

	if (rc == FAILED)
2558 2559 2560 2561
		ibmvfc_issue_fc_host_lip(shost);
	LEAVE;
}

2562
static const struct ibmvfc_async_desc ae_desc [] = {
2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575
	{ "PLOGI",	IBMVFC_AE_ELS_PLOGI,	IBMVFC_DEFAULT_LOG_LEVEL + 1 },
	{ "LOGO",	IBMVFC_AE_ELS_LOGO,	IBMVFC_DEFAULT_LOG_LEVEL + 1 },
	{ "PRLO",	IBMVFC_AE_ELS_PRLO,	IBMVFC_DEFAULT_LOG_LEVEL + 1 },
	{ "N-Port SCN",	IBMVFC_AE_SCN_NPORT,	IBMVFC_DEFAULT_LOG_LEVEL + 1 },
	{ "Group SCN",	IBMVFC_AE_SCN_GROUP,	IBMVFC_DEFAULT_LOG_LEVEL + 1 },
	{ "Domain SCN",	IBMVFC_AE_SCN_DOMAIN,	IBMVFC_DEFAULT_LOG_LEVEL },
	{ "Fabric SCN",	IBMVFC_AE_SCN_FABRIC,	IBMVFC_DEFAULT_LOG_LEVEL },
	{ "Link Up",	IBMVFC_AE_LINK_UP,	IBMVFC_DEFAULT_LOG_LEVEL },
	{ "Link Down",	IBMVFC_AE_LINK_DOWN,	IBMVFC_DEFAULT_LOG_LEVEL },
	{ "Link Dead",	IBMVFC_AE_LINK_DEAD,	IBMVFC_DEFAULT_LOG_LEVEL },
	{ "Halt",	IBMVFC_AE_HALT,		IBMVFC_DEFAULT_LOG_LEVEL },
	{ "Resume",	IBMVFC_AE_RESUME,	IBMVFC_DEFAULT_LOG_LEVEL },
	{ "Adapter Failed", IBMVFC_AE_ADAPTER_FAILED, IBMVFC_DEFAULT_LOG_LEVEL },
2576 2577
};

2578
static const struct ibmvfc_async_desc unknown_ae = {
2579
	"Unknown async", 0, IBMVFC_DEFAULT_LOG_LEVEL
2580
};
2581 2582 2583 2584 2585 2586

/**
 * ibmvfc_get_ae_desc - Get text description for async event
 * @ae:	async event
 *
 **/
2587
static const struct ibmvfc_async_desc *ibmvfc_get_ae_desc(u64 ae)
2588 2589 2590 2591 2592
{
	int i;

	for (i = 0; i < ARRAY_SIZE(ae_desc); i++)
		if (ae_desc[i].ae == ae)
2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619
			return &ae_desc[i];

	return &unknown_ae;
}

static const struct {
	enum ibmvfc_ae_link_state state;
	const char *desc;
} link_desc [] = {
	{ IBMVFC_AE_LS_LINK_UP,		" link up" },
	{ IBMVFC_AE_LS_LINK_BOUNCED,	" link bounced" },
	{ IBMVFC_AE_LS_LINK_DOWN,	" link down" },
	{ IBMVFC_AE_LS_LINK_DEAD,	" link dead" },
};

/**
 * ibmvfc_get_link_state - Get text description for link state
 * @state:	link state
 *
 **/
static const char *ibmvfc_get_link_state(enum ibmvfc_ae_link_state state)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(link_desc); i++)
		if (link_desc[i].state == state)
			return link_desc[i].desc;
2620

2621
	return "";
2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632
}

/**
 * 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)
{
2633
	const struct ibmvfc_async_desc *desc = ibmvfc_get_ae_desc(crq->event);
2634
	struct ibmvfc_target *tgt;
2635

2636 2637 2638
	ibmvfc_log(vhost, desc->log_level, "%s event received. scsi_id: %llx, wwpn: %llx,"
		   " node_name: %llx%s\n", desc->desc, crq->scsi_id, crq->wwpn, crq->node_name,
		   ibmvfc_get_link_state(crq->link_state));
2639 2640 2641

	switch (crq->event) {
	case IBMVFC_AE_RESUME:
2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659
		switch (crq->link_state) {
		case IBMVFC_AE_LS_LINK_DOWN:
			ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
			break;
		case IBMVFC_AE_LS_LINK_DEAD:
			ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
			break;
		case IBMVFC_AE_LS_LINK_UP:
		case IBMVFC_AE_LS_LINK_BOUNCED:
		default:
			vhost->events_to_log |= IBMVFC_AE_LINKUP;
			vhost->delay_init = 1;
			__ibmvfc_reset_host(vhost);
			break;
		};

		break;
	case IBMVFC_AE_LINK_UP:
2660
		vhost->events_to_log |= IBMVFC_AE_LINKUP;
2661 2662
		vhost->delay_init = 1;
		__ibmvfc_reset_host(vhost);
2663 2664
		break;
	case IBMVFC_AE_SCN_FABRIC:
2665
	case IBMVFC_AE_SCN_DOMAIN:
2666
		vhost->events_to_log |= IBMVFC_AE_RSCN;
2667 2668 2669 2670
		if (vhost->state < IBMVFC_HALTED) {
			vhost->delay_init = 1;
			__ibmvfc_reset_host(vhost);
		}
2671 2672 2673 2674
		break;
	case IBMVFC_AE_SCN_NPORT:
	case IBMVFC_AE_SCN_GROUP:
		vhost->events_to_log |= IBMVFC_AE_RSCN;
2675 2676
		ibmvfc_reinit_host(vhost);
		break;
2677 2678 2679
	case IBMVFC_AE_ELS_LOGO:
	case IBMVFC_AE_ELS_PRLO:
	case IBMVFC_AE_ELS_PLOGI:
2680 2681 2682 2683 2684 2685 2686 2687 2688
		list_for_each_entry(tgt, &vhost->targets, queue) {
			if (!crq->scsi_id && !crq->wwpn && !crq->node_name)
				break;
			if (crq->scsi_id && tgt->scsi_id != crq->scsi_id)
				continue;
			if (crq->wwpn && tgt->ids.port_name != crq->wwpn)
				continue;
			if (crq->node_name && tgt->ids.node_name != crq->node_name)
				continue;
2689 2690 2691 2692 2693 2694
			if (tgt->need_login && crq->event == IBMVFC_AE_ELS_LOGO)
				tgt->logo_rcvd = 1;
			if (!tgt->need_login || crq->event == IBMVFC_AE_ELS_PLOGI) {
				ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
				ibmvfc_reinit_host(vhost);
			}
2695
		}
2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707
		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:
2708
		dev_err(vhost->dev, "Unknown async event received: %lld\n", crq->event);
2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731
		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)
2732
				ibmvfc_init_host(vhost);
2733 2734 2735 2736 2737
			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");
2738
			ibmvfc_init_host(vhost);
2739 2740 2741 2742 2743 2744 2745
			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;
2746
		vhost->logged_in = 0;
2747 2748 2749 2750 2751 2752
		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);
2753 2754
			ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
			ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_REENABLE);
2755 2756 2757
		} else {
			dev_err(vhost->dev, "Virtual adapter failed (rc=%d)\n", crq->format);
			ibmvfc_purge_requests(vhost, DID_ERROR);
2758 2759
			ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
			ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776
		}
		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))) {
2777
		dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n",
2778 2779 2780 2781 2782
			crq->ioba);
		return;
	}

	if (unlikely(atomic_read(&evt->free))) {
2783
		dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n",
2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814
			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;
	}

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	if (vhost->scan_complete)
2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846
		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;
}

2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900
/**
 * 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;
	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);
	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
2901
 * @reason:	calling context
2902 2903 2904 2905
 *
 * Return value:
 * 	actual depth set
 **/
2906 2907
static int ibmvfc_change_queue_depth(struct scsi_device *sdev, int qdepth,
				     int reason)
2908
{
2909 2910 2911
	if (reason != SCSI_QDEPTH_DEFAULT)
		return -EOPNOTSUPP;

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 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989
	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 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 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 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 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);
}

2990 2991 2992 2993 2994 2995 2996 2997
static ssize_t ibmvfc_show_host_capabilities(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, "%llx\n", vhost->login_buf->resp.capabilities);
}

2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041
/**
 * 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);
}

3042 3043 3044 3045 3046
static DEVICE_ATTR(partition_name, S_IRUGO, ibmvfc_show_host_partition_name, NULL);
static DEVICE_ATTR(device_name, S_IRUGO, ibmvfc_show_host_device_name, NULL);
static DEVICE_ATTR(port_loc_code, S_IRUGO, ibmvfc_show_host_loc_code, NULL);
static DEVICE_ATTR(drc_name, S_IRUGO, ibmvfc_show_host_drc_name, NULL);
static DEVICE_ATTR(npiv_version, S_IRUGO, ibmvfc_show_host_npiv_version, NULL);
3047
static DEVICE_ATTR(capabilities, S_IRUGO, ibmvfc_show_host_capabilities, NULL);
3048 3049
static DEVICE_ATTR(log_level, S_IRUGO | S_IWUSR,
		   ibmvfc_show_log_level, ibmvfc_store_log_level);
3050 3051 3052 3053

#ifdef CONFIG_SCSI_IBMVFC_TRACE
/**
 * ibmvfc_read_trace - Dump the adapter trace
3054
 * @filp:		open sysfs file
3055 3056 3057 3058 3059 3060 3061 3062 3063
 * @kobj:		kobject struct
 * @bin_attr:	bin_attribute struct
 * @buf:		buffer
 * @off:		offset
 * @count:		buffer size
 *
 * Return value:
 *	number of bytes printed to buffer
 **/
3064
static ssize_t ibmvfc_read_trace(struct file *filp, struct kobject *kobj,
3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098
				 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[] = {
3099 3100 3101 3102 3103
	&dev_attr_partition_name,
	&dev_attr_device_name,
	&dev_attr_port_loc_code,
	&dev_attr_drc_name,
	&dev_attr_npiv_version,
3104
	&dev_attr_capabilities,
3105
	&dev_attr_log_level,
3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119
	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,
3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148
	.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;
3149
		rmb();
3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171
	} 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;
3172
		rmb();
3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189
	} 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;
3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208
	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;
3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220
	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 async CRQ */
		while ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
			ibmvfc_handle_async(async, vhost);
			async->valid = 0;
3221
			wmb();
3222 3223
		}

3224 3225
		/* Pull all the valid messages off the CRQ */
		while ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3226 3227
			ibmvfc_handle_crq(crq, vhost);
			crq->valid = 0;
3228
			wmb();
3229 3230 3231 3232
		}

		vio_enable_interrupts(vdev);
		if ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3233 3234
			vio_disable_interrupts(vdev);
			ibmvfc_handle_async(async, vhost);
3235
			async->valid = 0;
3236
			wmb();
3237 3238 3239 3240
		} else if ((crq = ibmvfc_next_crq(vhost)) != NULL) {
			vio_disable_interrupts(vdev);
			ibmvfc_handle_crq(crq, vhost);
			crq->valid = 0;
3241
			wmb();
3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267
		} 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
 *
3268 3269
 * Returns: 1 if step will be retried / 0 if not
 *
3270
 **/
3271
static int ibmvfc_retry_tgt_init(struct ibmvfc_target *tgt,
3272 3273
				  void (*job_step) (struct ibmvfc_target *))
{
3274
	if (++tgt->init_retries > IBMVFC_MAX_TGT_INIT_RETRIES) {
3275 3276
		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
		wake_up(&tgt->vhost->work_wait_q);
3277
		return 0;
3278 3279
	} else
		ibmvfc_init_tgt(tgt, job_step);
3280
	return 1;
3281 3282
}

3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316
/* 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;
}

3317 3318 3319 3320 3321 3322 3323 3324 3325 3326
/**
 * 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;
3327
	struct ibmvfc_prli_svc_parms *parms = &rsp->parms;
3328
	u32 status = rsp->common.status;
3329
	int index, level = IBMVFC_DEFAULT_LOG_LEVEL;
3330 3331 3332 3333 3334

	vhost->discovery_threads--;
	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
	switch (status) {
	case IBMVFC_MAD_SUCCESS:
3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347
		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;
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					tgt->add_rport = 1;
3349 3350 3351 3352 3353 3354 3355 3356
				} 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);
3357 3358 3359 3360 3361 3362 3363 3364
		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:
3365 3366 3367 3368 3369
		if ((rsp->status & IBMVFC_VIOS_FAILURE) && rsp->error == IBMVFC_PLOGI_REQUIRED)
			level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
		else if (tgt->logo_rcvd)
			level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
		else if (ibmvfc_retry_cmd(rsp->status, rsp->error))
3370
			level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3371 3372
		else
			ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3373 3374 3375 3376

		tgt_log(tgt, level, "Process Login failed: %s (%x:%x) rc=0x%02X\n",
			ibmvfc_get_cmd_error(rsp->status, rsp->error),
			rsp->status, rsp->error, status);
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 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434
		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;
3435
	int level = IBMVFC_DEFAULT_LOG_LEVEL;
3436 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

	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:
		if (ibmvfc_retry_cmd(rsp->status, rsp->error))
3465
			level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3466 3467
		else
			ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3468 3469 3470 3471 3472

		tgt_log(tgt, level, "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);
3473 3474 3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494 3495
		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);
3496
	tgt->logo_rcvd = 0;
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
	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);
3628
	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))
3634
			ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
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		break;
	case IBMVFC_MAD_DRIVER_FAILED:
		break;
	case IBMVFC_MAD_FAILED:
	default:
3640
		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
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		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);
}

3684 3685 3686 3687 3688 3689 3690 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 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757
/**
 * 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
 *
3762 3763 3764 3765 3766 3767
 * 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;
3788
	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;

3797 3798 3799 3800 3801 3802 3803 3804 3805
	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);
3807
	if (ibmvfc_send_event(evt, vhost, IBMVFC_ADISC_PLUS_CANCEL_TIMEOUT)) {
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		vhost->discovery_threads--;
3809
		del_timer(&tgt->timer);
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3810 3811 3812 3813 3814 3815
		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
		kref_put(&tgt->kref, ibmvfc_release_tgt);
	} else
		tgt_dbg(tgt, "Sent ADISC\n");
}

3816 3817 3818 3819 3820 3821 3822 3823 3824 3825 3826
/**
 * 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;
3827
	int level = IBMVFC_DEFAULT_LOG_LEVEL;
3828 3829 3830 3831 3832 3833 3834 3835 3836

	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);
B
Brian King 已提交
3837 3838
		else
			ibmvfc_init_tgt(tgt, ibmvfc_tgt_adisc);
3839 3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850 3851
		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:
		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))
3852
			level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
3853 3854
		else
			ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3855 3856 3857 3858 3859

		tgt_log(tgt, level, "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);
3860 3861 3862 3863 3864 3865 3866 3867 3868 3869 3870 3871 3872 3873 3874 3875 3876 3877 3878 3879 3880 3881 3882 3883 3884 3885 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
		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);

3926
	tgt = mempool_alloc(vhost->tgt_pool, GFP_NOIO);
3927
	if (!tgt) {
3928
		dev_err(vhost->dev, "Target allocation failure for scsi id %08llx\n",
3929 3930 3931 3932
			scsi_id);
		return -ENOMEM;
	}

B
Brian King 已提交
3933
	memset(tgt, 0, sizeof(*tgt));
3934 3935 3936 3937
	tgt->scsi_id = scsi_id;
	tgt->new_scsi_id = scsi_id;
	tgt->vhost = vhost;
	tgt->need_login = 1;
3938 3939
	tgt->cancel_key = vhost->task_set++;
	init_timer(&tgt->timer);
3940 3941 3942 3943 3944 3945 3946 3947 3948 3949 3950 3951 3952 3953 3954 3955 3956 3957 3958 3959 3960 3961 3962 3963 3964 3965 3966 3967 3968 3969 3970 3971 3972 3973 3974 3975 3976 3977
	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;
3978
	int level = IBMVFC_DEFAULT_LOG_LEVEL;
3979 3980 3981 3982 3983 3984 3985 3986

	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:
3987 3988 3989
		level += ibmvfc_retry_host_init(vhost);
		ibmvfc_log(vhost, level, "Discover Targets failed: %s (%x:%x)\n",
			   ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error);
3990 3991 3992 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
		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;
4041
	int level = IBMVFC_DEFAULT_LOG_LEVEL;
4042 4043 4044 4045 4046 4047 4048

	switch (mad_status) {
	case IBMVFC_MAD_SUCCESS:
		ibmvfc_free_event(evt);
		break;
	case IBMVFC_MAD_FAILED:
		if (ibmvfc_retry_cmd(rsp->status, rsp->error))
4049
			level += ibmvfc_retry_host_init(vhost);
4050 4051
		else
			ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4052 4053
		ibmvfc_log(vhost, level, "NPIV Login failed: %s (%x:%x)\n",
			   ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error);
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
		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;
	}

4086
	vhost->logged_in = 1;
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
	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);
};

4144 4145 4146 4147 4148 4149 4150 4151 4152 4153 4154 4155 4156 4157 4158 4159
/**
 * ibmvfc_npiv_logout_done - Completion handler for NPIV Logout
 * @vhost:		ibmvfc host struct
 *
 **/
static void ibmvfc_npiv_logout_done(struct ibmvfc_event *evt)
{
	struct ibmvfc_host *vhost = evt->vhost;
	u32 mad_status = evt->xfer_iu->npiv_logout.common.status;

	ibmvfc_free_event(evt);

	switch (mad_status) {
	case IBMVFC_MAD_SUCCESS:
		if (list_empty(&vhost->sent) &&
		    vhost->action == IBMVFC_HOST_ACTION_LOGO_WAIT) {
4160
			ibmvfc_init_host(vhost);
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
			return;
		}
		break;
	case IBMVFC_MAD_FAILED:
	case IBMVFC_MAD_NOT_SUPPORTED:
	case IBMVFC_MAD_CRQ_ERROR:
	case IBMVFC_MAD_DRIVER_FAILED:
	default:
		ibmvfc_dbg(vhost, "NPIV Logout failed. 0x%X\n", mad_status);
		break;
	}

	ibmvfc_hard_reset_host(vhost);
}

/**
 * ibmvfc_npiv_logout - Issue an NPIV Logout
 * @vhost:		ibmvfc host struct
 *
 **/
static void ibmvfc_npiv_logout(struct ibmvfc_host *vhost)
{
	struct ibmvfc_npiv_logout_mad *mad;
	struct ibmvfc_event *evt;

	evt = ibmvfc_get_event(vhost);
	ibmvfc_init_event(evt, ibmvfc_npiv_logout_done, IBMVFC_MAD_FORMAT);

	mad = &evt->iu.npiv_logout;
	memset(mad, 0, sizeof(*mad));
	mad->common.version = 1;
	mad->common.opcode = IBMVFC_NPIV_LOGOUT;
	mad->common.length = sizeof(struct ibmvfc_npiv_logout_mad);

	ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO_WAIT);

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

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 4235 4236 4237 4238
/**
 * 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:
4239
	case IBMVFC_HOST_ACTION_LOGO_WAIT:
4240 4241 4242 4243 4244 4245 4246 4247 4248 4249 4250 4251
		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;
4252
	case IBMVFC_HOST_ACTION_LOGO:
4253 4254 4255
	case IBMVFC_HOST_ACTION_INIT:
	case IBMVFC_HOST_ACTION_ALLOC_TGTS:
	case IBMVFC_HOST_ACTION_TGT_DEL:
4256
	case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
4257
	case IBMVFC_HOST_ACTION_QUERY:
4258 4259
	case IBMVFC_HOST_ACTION_RESET:
	case IBMVFC_HOST_ACTION_REENABLE:
4260 4261 4262 4263 4264 4265 4266 4267 4268 4269 4270 4271 4272 4273 4274 4275 4276 4277 4278 4279 4280 4281 4282 4283 4284 4285 4286 4287 4288 4289 4290 4291 4292 4293 4294 4295 4296 4297 4298 4299 4300 4301 4302 4303 4304 4305 4306 4307 4308 4309 4310
	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
4311
	struct fc_rport *rport;
4312 4313
	unsigned long flags;

B
Brian King 已提交
4314 4315 4316 4317 4318 4319 4320
	tgt_dbg(tgt, "Adding rport\n");
	rport = fc_remote_port_add(vhost->host, 0, &tgt->ids);
	spin_lock_irqsave(vhost->host->host_lock, flags);

	if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
		tgt_dbg(tgt, "Deleting rport\n");
		list_del(&tgt->queue);
4321
		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
B
Brian King 已提交
4322
		spin_unlock_irqrestore(vhost->host->host_lock, flags);
B
Brian King 已提交
4323 4324 4325
		fc_remote_port_delete(rport);
		del_timer_sync(&tgt->timer);
		kref_put(&tgt->kref, ibmvfc_release_tgt);
B
Brian King 已提交
4326
		return;
4327 4328 4329
	} else if (rport && tgt->action == IBMVFC_TGT_ACTION_DELETED_RPORT) {
		spin_unlock_irqrestore(vhost->host->host_lock, flags);
		return;
B
Brian King 已提交
4330 4331
	}

4332 4333
	if (rport) {
		tgt_dbg(tgt, "rport add succeeded\n");
B
Brian King 已提交
4334
		tgt->rport = rport;
4335 4336
		rport->maxframe_size = tgt->service_parms.common.bb_rcv_sz & 0x0fff;
		rport->supported_classes = 0;
B
Brian King 已提交
4337
		tgt->target_id = rport->scsi_target_id;
4338 4339 4340 4341 4342 4343
		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;
4344
		if (rport->rqst_q)
4345
			blk_queue_max_segments(rport->rqst_q, 1);
4346 4347 4348 4349 4350 4351 4352 4353 4354 4355 4356 4357 4358 4359 4360
	} 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;
4361
	int rc;
4362 4363 4364 4365 4366 4367

	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:
4368
	case IBMVFC_HOST_ACTION_LOGO_WAIT:
4369 4370
	case IBMVFC_HOST_ACTION_INIT_WAIT:
		break;
4371 4372 4373 4374 4375
	case IBMVFC_HOST_ACTION_RESET:
		vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
		spin_unlock_irqrestore(vhost->host->host_lock, flags);
		rc = ibmvfc_reset_crq(vhost);
		spin_lock_irqsave(vhost->host->host_lock, flags);
4376 4377
		if (rc == H_CLOSED)
			vio_enable_interrupts(to_vio_dev(vhost->dev));
4378 4379
		if (rc || (rc = ibmvfc_send_crq_init(vhost)) ||
		    (rc = vio_enable_interrupts(to_vio_dev(vhost->dev)))) {
4380 4381 4382 4383 4384 4385 4386 4387 4388 4389 4390 4391 4392 4393
			ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
			dev_err(vhost->dev, "Error after reset (rc=%d)\n", rc);
		}
		break;
	case IBMVFC_HOST_ACTION_REENABLE:
		vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
		spin_unlock_irqrestore(vhost->host->host_lock, flags);
		rc = ibmvfc_reenable_crq_queue(vhost);
		spin_lock_irqsave(vhost->host->host_lock, flags);
		if (rc || (rc = ibmvfc_send_crq_init(vhost))) {
			ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
			dev_err(vhost->dev, "Error after enable (rc=%d)\n", rc);
		}
		break;
4394 4395 4396
	case IBMVFC_HOST_ACTION_LOGO:
		vhost->job_step(vhost);
		break;
4397 4398
	case IBMVFC_HOST_ACTION_INIT:
		BUG_ON(vhost->state != IBMVFC_INITIALIZING);
4399 4400 4401
		if (vhost->delay_init) {
			vhost->delay_init = 0;
			spin_unlock_irqrestore(vhost->host->host_lock, flags);
4402
			ssleep(15);
4403 4404 4405
			return;
		} else
			vhost->job_step(vhost);
4406 4407 4408 4409 4410 4411 4412 4413 4414 4415 4416 4417 4418 4419 4420 4421 4422 4423
		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:
4424
	case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
4425 4426 4427 4428 4429 4430
		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);
4431
				ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
4432 4433 4434
				spin_unlock_irqrestore(vhost->host->host_lock, flags);
				if (rport)
					fc_remote_port_delete(rport);
4435
				del_timer_sync(&tgt->timer);
4436 4437 4438 4439 4440 4441
				kref_put(&tgt->kref, ibmvfc_release_tgt);
				return;
			}
		}

		if (vhost->state == IBMVFC_INITIALIZING) {
4442
			if (vhost->action == IBMVFC_HOST_ACTION_TGT_DEL_FAILED) {
B
Brian King 已提交
4443 4444 4445 4446 4447 4448 4449 4450 4451 4452 4453 4454 4455 4456 4457
				if (vhost->reinit) {
					vhost->reinit = 0;
					scsi_block_requests(vhost->host);
					ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
					spin_unlock_irqrestore(vhost->host->host_lock, flags);
				} else {
					ibmvfc_set_host_state(vhost, IBMVFC_ACTIVE);
					ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
					wake_up(&vhost->init_wait_q);
					schedule_work(&vhost->rport_add_work_q);
					vhost->init_retries = 0;
					spin_unlock_irqrestore(vhost->host->host_lock, flags);
					scsi_unblock_requests(vhost->host);
				}

4458 4459 4460 4461 4462
				return;
			} else {
				ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
				vhost->job_step = ibmvfc_discover_targets;
			}
4463 4464 4465 4466 4467 4468 4469 4470 4471 4472 4473 4474 4475 4476 4477 4478 4479 4480 4481 4482 4483 4484
		} 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;
			}
		}

4485 4486
		if (!ibmvfc_dev_init_to_do(vhost))
			ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL_FAILED);
4487 4488 4489 4490 4491 4492 4493 4494 4495 4496 4497 4498 4499 4500 4501 4502 4503 4504 4505 4506 4507 4508 4509 4510 4511 4512 4513 4514 4515 4516 4517 4518 4519 4520 4521 4522 4523 4524 4525 4526 4527 4528 4529 4530 4531 4532 4533 4534 4535 4536 4537 4538 4539 4540 4541 4542 4543 4544 4545 4546 4547 4548 4549 4550 4551
		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);

4552
	if (dma_mapping_error(dev, crq->msg_token))
4553 4554 4555 4556 4557 4558 4559 4560 4561 4562 4563 4564 4565 4566 4567 4568 4569 4570
		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;

4571 4572
	tasklet_init(&vhost->tasklet, (void *)ibmvfc_tasklet, (unsigned long)vhost);

4573 4574 4575 4576 4577 4578 4579 4580 4581 4582 4583 4584 4585 4586 4587
	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:
4588
	tasklet_kill(&vhost->tasklet);
4589 4590 4591 4592 4593 4594 4595 4596 4597 4598 4599 4600 4601 4602 4603 4604 4605 4606 4607 4608 4609 4610 4611 4612 4613 4614 4615 4616 4617 4618 4619 4620 4621 4622 4623 4624 4625 4626 4627 4628 4629 4630 4631 4632 4633 4634 4635 4636 4637 4638 4639 4640 4641 4642 4643 4644 4645 4646 4647
	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);

4648
	if (dma_mapping_error(dev, async_q->msg_token)) {
4649 4650 4651 4652 4653 4654 4655 4656 4657 4658 4659 4660 4661 4662 4663 4664 4665 4666 4667 4668 4669 4670 4671 4672 4673 4674 4675 4676 4677 4678 4679 4680 4681 4682 4683 4684
		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;

4685
	vhost->tgt_pool = mempool_create_kmalloc_pool(IBMVFC_TGT_MEMPOOL_SZ,
4686 4687 4688 4689 4690 4691 4692 4693 4694 4695 4696 4697 4698 4699 4700 4701 4702 4703 4704 4705 4706 4707 4708 4709 4710 4711 4712 4713 4714 4715
						      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;
}

B
Brian King 已提交
4716 4717 4718 4719 4720 4721 4722 4723 4724 4725 4726 4727 4728 4729 4730 4731 4732 4733 4734 4735 4736 4737 4738 4739 4740 4741 4742 4743 4744 4745 4746 4747 4748 4749 4750 4751 4752 4753 4754 4755 4756 4757 4758 4759 4760 4761 4762 4763 4764 4765
/**
 * ibmvfc_rport_add_thread - Worker thread for rport adds
 * @work:	work struct
 *
 **/
static void ibmvfc_rport_add_thread(struct work_struct *work)
{
	struct ibmvfc_host *vhost = container_of(work, struct ibmvfc_host,
						 rport_add_work_q);
	struct ibmvfc_target *tgt;
	struct fc_rport *rport;
	unsigned long flags;
	int did_work;

	ENTER;
	spin_lock_irqsave(vhost->host->host_lock, flags);
	do {
		did_work = 0;
		if (vhost->state != IBMVFC_ACTIVE)
			break;

		list_for_each_entry(tgt, &vhost->targets, queue) {
			if (tgt->add_rport) {
				did_work = 1;
				tgt->add_rport = 0;
				kref_get(&tgt->kref);
				rport = tgt->rport;
				if (!rport) {
					spin_unlock_irqrestore(vhost->host->host_lock, flags);
					ibmvfc_tgt_add_rport(tgt);
				} else if (get_device(&rport->dev)) {
					spin_unlock_irqrestore(vhost->host->host_lock, flags);
					tgt_dbg(tgt, "Setting rport roles\n");
					fc_remote_port_rolechg(rport, tgt->ids.roles);
					put_device(&rport->dev);
				}

				kref_put(&tgt->kref, ibmvfc_release_tgt);
				spin_lock_irqsave(vhost->host->host_lock, flags);
				break;
			}
		}
	} while(did_work);

	if (vhost->state == IBMVFC_ACTIVE)
		vhost->scan_complete = 1;
	spin_unlock_irqrestore(vhost->host->host_lock, flags);
	LEAVE;
}

4766 4767 4768 4769 4770 4771 4772 4773 4774 4775 4776 4777 4778 4779 4780 4781 4782 4783 4784 4785 4786 4787 4788 4789 4790 4791 4792 4793 4794 4795 4796 4797 4798 4799 4800 4801 4802 4803 4804
/**
 * 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;
4805
	vhost->task_set = 1;
4806 4807 4808
	strcpy(vhost->partition_name, "UNKNOWN");
	init_waitqueue_head(&vhost->work_wait_q);
	init_waitqueue_head(&vhost->init_wait_q);
B
Brian King 已提交
4809
	INIT_WORK(&vhost->rport_add_work_q, ibmvfc_rport_add_thread);
4810
	mutex_init(&vhost->passthru_mutex);
4811 4812 4813 4814 4815 4816 4817 4818 4819 4820 4821 4822 4823 4824 4825 4826 4827 4828 4829 4830 4831 4832 4833 4834 4835 4836

	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;

4837 4838
	fc_host_dev_loss_tmo(shost) = IBMVFC_DEV_LOSS_TMO;

4839 4840 4841 4842 4843 4844
	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;
	}

4845
	if (shost_to_fc_host(shost)->rqst_q)
4846
		blk_queue_max_segments(shost_to_fc_host(shost)->rqst_q, 1);
4847 4848 4849 4850 4851 4852 4853 4854 4855 4856 4857 4858 4859 4860 4861 4862 4863 4864 4865 4866 4867 4868 4869 4870 4871 4872 4873 4874 4875 4876 4877 4878 4879 4880 4881 4882 4883 4884 4885 4886
	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);
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	spin_lock_irqsave(vhost->host->host_lock, flags);
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	ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
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	spin_unlock_irqrestore(vhost->host->host_lock, flags);

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	ibmvfc_wait_while_resetting(vhost);
	ibmvfc_release_crq_queue(vhost);
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	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;
}

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/**
 * ibmvfc_resume - Resume from suspend
 * @dev:	device struct
 *
 * We may have lost an interrupt across suspend/resume, so kick the
 * interrupt handler
 *
 */
static int ibmvfc_resume(struct device *dev)
{
	unsigned long flags;
	struct ibmvfc_host *vhost = dev_get_drvdata(dev);
	struct vio_dev *vdev = to_vio_dev(dev);

	spin_lock_irqsave(vhost->host->host_lock, flags);
	vio_disable_interrupts(vdev);
	tasklet_schedule(&vhost->tasklet);
	spin_unlock_irqrestore(vhost->host->host_lock, flags);
	return 0;
}

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/**
 * 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);
}

4947
static struct vio_device_id ibmvfc_device_table[] = {
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	{"fcp", "IBM,vfc-client"},
	{ "", "" }
};
MODULE_DEVICE_TABLE(vio, ibmvfc_device_table);

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static struct dev_pm_ops ibmvfc_pm_ops = {
	.resume = ibmvfc_resume
};

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static struct vio_driver ibmvfc_driver = {
	.id_table = ibmvfc_device_table,
	.probe = ibmvfc_probe,
	.remove = ibmvfc_remove,
4961
	.get_desired_dma = ibmvfc_get_desired_dma,
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	.name = IBMVFC_NAME,
	.pm = &ibmvfc_pm_ops,
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};

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,
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	.show_host_maxframe_size = 1,
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	.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,
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	.bsg_request = ibmvfc_bsg_request,
	.bsg_timeout = ibmvfc_bsg_timeout,
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};

/**
 * 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);