1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * ibmvfc.c -- driver for IBM Power Virtual Fibre Channel Adapter
   4 *
   5 * Written By: Brian King <brking@linux.vnet.ibm.com>, IBM Corporation
   6 *
   7 * Copyright (C) IBM Corporation, 2008
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   8 */
   9
  10#include <linux/module.h>
  11#include <linux/moduleparam.h>
  12#include <linux/dma-mapping.h>
  13#include <linux/dmapool.h>
  14#include <linux/delay.h>
  15#include <linux/interrupt.h>
  16#include <linux/irqdomain.h>
  17#include <linux/kthread.h>
  18#include <linux/slab.h>
  19#include <linux/of.h>
  20#include <linux/pm.h>
  21#include <linux/stringify.h>
  22#include <linux/bsg-lib.h>
  23#include <asm/firmware.h>
  24#include <asm/irq.h>
  25#include <asm/vio.h>
  26#include <scsi/scsi.h>
  27#include <scsi/scsi_cmnd.h>
  28#include <scsi/scsi_host.h>
  29#include <scsi/scsi_device.h>
  30#include <scsi/scsi_tcq.h>
  31#include <scsi/scsi_transport_fc.h>
  32#include <scsi/scsi_bsg_fc.h>
  33#include "ibmvfc.h"
  34
  35static unsigned int init_timeout = IBMVFC_INIT_TIMEOUT;
  36static unsigned int default_timeout = IBMVFC_DEFAULT_TIMEOUT;
  37static u64 max_lun = IBMVFC_MAX_LUN;
  38static unsigned int max_targets = IBMVFC_MAX_TARGETS;
  39static unsigned int max_requests = IBMVFC_MAX_REQUESTS_DEFAULT;
  40static u16 scsi_qdepth = IBMVFC_SCSI_QDEPTH;
  41static unsigned int disc_threads = IBMVFC_MAX_DISC_THREADS;
  42static unsigned int ibmvfc_debug = IBMVFC_DEBUG;
  43static unsigned int log_level = IBMVFC_DEFAULT_LOG_LEVEL;
  44static unsigned int cls3_error = IBMVFC_CLS3_ERROR;
  45static unsigned int mq_enabled = IBMVFC_MQ;
  46static unsigned int nr_scsi_hw_queues = IBMVFC_SCSI_HW_QUEUES;
  47static unsigned int nr_scsi_channels = IBMVFC_SCSI_CHANNELS;
  48static unsigned int mig_channels_only = IBMVFC_MIG_NO_SUB_TO_CRQ;
  49static unsigned int mig_no_less_channels = IBMVFC_MIG_NO_N_TO_M;
  50
  51static LIST_HEAD(ibmvfc_head);
  52static DEFINE_SPINLOCK(ibmvfc_driver_lock);
  53static struct scsi_transport_template *ibmvfc_transport_template;
  54
  55MODULE_DESCRIPTION("IBM Virtual Fibre Channel Driver");
  56MODULE_AUTHOR("Brian King <brking@linux.vnet.ibm.com>");
  57MODULE_LICENSE("GPL");
  58MODULE_VERSION(IBMVFC_DRIVER_VERSION);
  59
  60module_param_named(mq, mq_enabled, uint, S_IRUGO);
  61MODULE_PARM_DESC(mq, "Enable multiqueue support. "
  62		 "[Default=" __stringify(IBMVFC_MQ) "]");
  63module_param_named(scsi_host_queues, nr_scsi_hw_queues, uint, S_IRUGO);
  64MODULE_PARM_DESC(scsi_host_queues, "Number of SCSI Host submission queues. "
  65		 "[Default=" __stringify(IBMVFC_SCSI_HW_QUEUES) "]");
  66module_param_named(scsi_hw_channels, nr_scsi_channels, uint, S_IRUGO);
  67MODULE_PARM_DESC(scsi_hw_channels, "Number of hw scsi channels to request. "
  68		 "[Default=" __stringify(IBMVFC_SCSI_CHANNELS) "]");
  69module_param_named(mig_channels_only, mig_channels_only, uint, S_IRUGO);
  70MODULE_PARM_DESC(mig_channels_only, "Prevent migration to non-channelized system. "
  71		 "[Default=" __stringify(IBMVFC_MIG_NO_SUB_TO_CRQ) "]");
  72module_param_named(mig_no_less_channels, mig_no_less_channels, uint, S_IRUGO);
  73MODULE_PARM_DESC(mig_no_less_channels, "Prevent migration to system with less channels. "
  74		 "[Default=" __stringify(IBMVFC_MIG_NO_N_TO_M) "]");
  75
  76module_param_named(init_timeout, init_timeout, uint, S_IRUGO | S_IWUSR);
  77MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds. "
  78		 "[Default=" __stringify(IBMVFC_INIT_TIMEOUT) "]");
  79module_param_named(default_timeout, default_timeout, uint, S_IRUGO | S_IWUSR);
  80MODULE_PARM_DESC(default_timeout,
  81		 "Default timeout in seconds for initialization and EH commands. "
  82		 "[Default=" __stringify(IBMVFC_DEFAULT_TIMEOUT) "]");
  83module_param_named(max_requests, max_requests, uint, S_IRUGO);
  84MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter. "
  85		 "[Default=" __stringify(IBMVFC_MAX_REQUESTS_DEFAULT) "]");
  86module_param_named(scsi_qdepth, scsi_qdepth, ushort, S_IRUGO);
  87MODULE_PARM_DESC(scsi_qdepth, "Maximum scsi command depth per adapter queue. "
  88		 "[Default=" __stringify(IBMVFC_SCSI_QDEPTH) "]");
  89module_param_named(max_lun, max_lun, ullong, S_IRUGO);
  90MODULE_PARM_DESC(max_lun, "Maximum allowed LUN. "
  91		 "[Default=" __stringify(IBMVFC_MAX_LUN) "]");
  92module_param_named(max_targets, max_targets, uint, S_IRUGO);
  93MODULE_PARM_DESC(max_targets, "Maximum allowed targets. "
  94		 "[Default=" __stringify(IBMVFC_MAX_TARGETS) "]");
  95module_param_named(disc_threads, disc_threads, uint, S_IRUGO);
  96MODULE_PARM_DESC(disc_threads, "Number of device discovery threads to use. "
  97		 "[Default=" __stringify(IBMVFC_MAX_DISC_THREADS) "]");
  98module_param_named(debug, ibmvfc_debug, uint, S_IRUGO | S_IWUSR);
  99MODULE_PARM_DESC(debug, "Enable driver debug information. "
 100		 "[Default=" __stringify(IBMVFC_DEBUG) "]");
 101module_param_named(log_level, log_level, uint, 0);
 102MODULE_PARM_DESC(log_level, "Set to 0 - 4 for increasing verbosity of device driver. "
 103		 "[Default=" __stringify(IBMVFC_DEFAULT_LOG_LEVEL) "]");
 104module_param_named(cls3_error, cls3_error, uint, 0);
 105MODULE_PARM_DESC(cls3_error, "Enable FC Class 3 Error Recovery. "
 106		 "[Default=" __stringify(IBMVFC_CLS3_ERROR) "]");
 107
 108static const struct {
 109	u16 status;
 110	u16 error;
 111	u8 result;
 112	u8 retry;
 113	int log;
 114	char *name;
 115} cmd_status [] = {
 116	{ IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_ESTABLISH, DID_ERROR, 1, 1, "unable to establish" },
 117	{ IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_FAULT, DID_OK, 1, 0, "transport fault" },
 118	{ IBMVFC_FABRIC_MAPPED, IBMVFC_CMD_TIMEOUT, DID_TIME_OUT, 1, 1, "command timeout" },
 119	{ IBMVFC_FABRIC_MAPPED, IBMVFC_ENETDOWN, DID_TRANSPORT_DISRUPTED, 1, 1, "network down" },
 120	{ IBMVFC_FABRIC_MAPPED, IBMVFC_HW_FAILURE, DID_ERROR, 1, 1, "hardware failure" },
 121	{ IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DOWN_ERR, DID_REQUEUE, 0, 0, "link down" },
 122	{ IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DEAD_ERR, DID_ERROR, 0, 0, "link dead" },
 123	{ IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_REGISTER, DID_ERROR, 1, 1, "unable to register" },
 124	{ IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_BUSY, DID_BUS_BUSY, 1, 0, "transport busy" },
 125	{ IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_DEAD, DID_ERROR, 0, 1, "transport dead" },
 126	{ IBMVFC_FABRIC_MAPPED, IBMVFC_CONFIG_ERROR, DID_ERROR, 1, 1, "configuration error" },
 127	{ IBMVFC_FABRIC_MAPPED, IBMVFC_NAME_SERVER_FAIL, DID_ERROR, 1, 1, "name server failure" },
 128	{ IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_HALTED, DID_REQUEUE, 1, 0, "link halted" },
 129	{ IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_GENERAL, DID_OK, 1, 0, "general transport error" },
 130
 131	{ IBMVFC_VIOS_FAILURE, IBMVFC_CRQ_FAILURE, DID_REQUEUE, 1, 1, "CRQ failure" },
 132	{ IBMVFC_VIOS_FAILURE, IBMVFC_SW_FAILURE, DID_ERROR, 0, 1, "software failure" },
 133	{ IBMVFC_VIOS_FAILURE, IBMVFC_INVALID_PARAMETER, DID_ERROR, 0, 1, "invalid parameter" },
 134	{ IBMVFC_VIOS_FAILURE, IBMVFC_MISSING_PARAMETER, DID_ERROR, 0, 1, "missing parameter" },
 135	{ IBMVFC_VIOS_FAILURE, IBMVFC_HOST_IO_BUS, DID_ERROR, 1, 1, "host I/O bus failure" },
 136	{ IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED, DID_ERROR, 0, 1, "transaction cancelled" },
 137	{ IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED_IMPLICIT, DID_ERROR, 0, 1, "transaction cancelled implicit" },
 138	{ IBMVFC_VIOS_FAILURE, IBMVFC_INSUFFICIENT_RESOURCE, DID_REQUEUE, 1, 1, "insufficient resources" },
 139	{ IBMVFC_VIOS_FAILURE, IBMVFC_PLOGI_REQUIRED, DID_ERROR, 0, 1, "port login required" },
 140	{ IBMVFC_VIOS_FAILURE, IBMVFC_COMMAND_FAILED, DID_ERROR, 1, 1, "command failed" },
 141
 142	{ IBMVFC_FC_FAILURE, IBMVFC_INVALID_ELS_CMD_CODE, DID_ERROR, 0, 1, "invalid ELS command code" },
 143	{ IBMVFC_FC_FAILURE, IBMVFC_INVALID_VERSION, DID_ERROR, 0, 1, "invalid version level" },
 144	{ IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_ERROR, DID_ERROR, 1, 1, "logical error" },
 145	{ IBMVFC_FC_FAILURE, IBMVFC_INVALID_CT_IU_SIZE, DID_ERROR, 0, 1, "invalid CT_IU size" },
 146	{ IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_BUSY, DID_REQUEUE, 1, 0, "logical busy" },
 147	{ IBMVFC_FC_FAILURE, IBMVFC_PROTOCOL_ERROR, DID_ERROR, 1, 1, "protocol error" },
 148	{ IBMVFC_FC_FAILURE, IBMVFC_UNABLE_TO_PERFORM_REQ, DID_ERROR, 1, 1, "unable to perform request" },
 149	{ IBMVFC_FC_FAILURE, IBMVFC_CMD_NOT_SUPPORTED, DID_ERROR, 0, 0, "command not supported" },
 150	{ IBMVFC_FC_FAILURE, IBMVFC_SERVER_NOT_AVAIL, DID_ERROR, 0, 1, "server not available" },
 151	{ IBMVFC_FC_FAILURE, IBMVFC_CMD_IN_PROGRESS, DID_ERROR, 0, 1, "command already in progress" },
 152	{ IBMVFC_FC_FAILURE, IBMVFC_VENDOR_SPECIFIC, DID_ERROR, 1, 1, "vendor specific" },
 153
 154	{ IBMVFC_FC_SCSI_ERROR, 0, DID_OK, 1, 0, "SCSI error" },
 155	{ IBMVFC_FC_SCSI_ERROR, IBMVFC_COMMAND_FAILED, DID_ERROR, 0, 1, "PRLI to device failed." },
 156};
 157
 158static void ibmvfc_npiv_login(struct ibmvfc_host *);
 159static void ibmvfc_tgt_send_prli(struct ibmvfc_target *);
 160static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *);
 161static void ibmvfc_tgt_query_target(struct ibmvfc_target *);
 162static void ibmvfc_npiv_logout(struct ibmvfc_host *);
 163static void ibmvfc_tgt_implicit_logout_and_del(struct ibmvfc_target *);
 164static void ibmvfc_tgt_move_login(struct ibmvfc_target *);
 165
 166static void ibmvfc_dereg_sub_crqs(struct ibmvfc_host *, struct ibmvfc_channels *);
 167static void ibmvfc_reg_sub_crqs(struct ibmvfc_host *, struct ibmvfc_channels *);
 168
 169static const char *unknown_error = "unknown error";
 170
 171static long h_reg_sub_crq(unsigned long unit_address, unsigned long ioba,
 172			  unsigned long length, unsigned long *cookie,
 173			  unsigned long *irq)
 174{
 175	unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
 176	long rc;
 177
 178	rc = plpar_hcall(H_REG_SUB_CRQ, retbuf, unit_address, ioba, length);
 179	*cookie = retbuf[0];
 180	*irq = retbuf[1];
 181
 182	return rc;
 183}
 184
 185static int ibmvfc_check_caps(struct ibmvfc_host *vhost, unsigned long cap_flags)
 186{
 187	u64 host_caps = be64_to_cpu(vhost->login_buf->resp.capabilities);
 188
 189	return (host_caps & cap_flags) ? 1 : 0;
 190}
 191
 192static struct ibmvfc_fcp_cmd_iu *ibmvfc_get_fcp_iu(struct ibmvfc_host *vhost,
 193						   struct ibmvfc_cmd *vfc_cmd)
 194{
 195	if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN))
 196		return &vfc_cmd->v2.iu;
 197	else
 198		return &vfc_cmd->v1.iu;
 199}
 200
 201static struct ibmvfc_fcp_rsp *ibmvfc_get_fcp_rsp(struct ibmvfc_host *vhost,
 202						 struct ibmvfc_cmd *vfc_cmd)
 203{
 204	if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN))
 205		return &vfc_cmd->v2.rsp;
 206	else
 207		return &vfc_cmd->v1.rsp;
 208}
 209
 210#ifdef CONFIG_SCSI_IBMVFC_TRACE
 211/**
 212 * ibmvfc_trc_start - Log a start trace entry
 213 * @evt:		ibmvfc event struct
 214 *
 215 **/
 216static void ibmvfc_trc_start(struct ibmvfc_event *evt)
 217{
 218	struct ibmvfc_host *vhost = evt->vhost;
 219	struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd;
 220	struct ibmvfc_mad_common *mad = &evt->iu.mad_common;
 221	struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd);
 222	struct ibmvfc_trace_entry *entry;
 223	int index = atomic_inc_return(&vhost->trace_index) & IBMVFC_TRACE_INDEX_MASK;
 224
 225	entry = &vhost->trace[index];
 226	entry->evt = evt;
 227	entry->time = jiffies;
 228	entry->fmt = evt->crq.format;
 229	entry->type = IBMVFC_TRC_START;
 230
 231	switch (entry->fmt) {
 232	case IBMVFC_CMD_FORMAT:
 233		entry->op_code = iu->cdb[0];
 234		entry->scsi_id = be64_to_cpu(vfc_cmd->tgt_scsi_id);
 235		entry->lun = scsilun_to_int(&iu->lun);
 236		entry->tmf_flags = iu->tmf_flags;
 237		entry->u.start.xfer_len = be32_to_cpu(iu->xfer_len);
 238		break;
 239	case IBMVFC_MAD_FORMAT:
 240		entry->op_code = be32_to_cpu(mad->opcode);
 241		break;
 242	default:
 243		break;
 244	}
 245}
 246
 247/**
 248 * ibmvfc_trc_end - Log an end trace entry
 249 * @evt:		ibmvfc event struct
 250 *
 251 **/
 252static void ibmvfc_trc_end(struct ibmvfc_event *evt)
 253{
 254	struct ibmvfc_host *vhost = evt->vhost;
 255	struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
 256	struct ibmvfc_mad_common *mad = &evt->xfer_iu->mad_common;
 257	struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd);
 258	struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd);
 259	struct ibmvfc_trace_entry *entry;
 260	int index = atomic_inc_return(&vhost->trace_index) & IBMVFC_TRACE_INDEX_MASK;
 261
 262	entry = &vhost->trace[index];
 263	entry->evt = evt;
 264	entry->time = jiffies;
 265	entry->fmt = evt->crq.format;
 266	entry->type = IBMVFC_TRC_END;
 267
 268	switch (entry->fmt) {
 269	case IBMVFC_CMD_FORMAT:
 270		entry->op_code = iu->cdb[0];
 271		entry->scsi_id = be64_to_cpu(vfc_cmd->tgt_scsi_id);
 272		entry->lun = scsilun_to_int(&iu->lun);
 273		entry->tmf_flags = iu->tmf_flags;
 274		entry->u.end.status = be16_to_cpu(vfc_cmd->status);
 275		entry->u.end.error = be16_to_cpu(vfc_cmd->error);
 276		entry->u.end.fcp_rsp_flags = rsp->flags;
 277		entry->u.end.rsp_code = rsp->data.info.rsp_code;
 278		entry->u.end.scsi_status = rsp->scsi_status;
 279		break;
 280	case IBMVFC_MAD_FORMAT:
 281		entry->op_code = be32_to_cpu(mad->opcode);
 282		entry->u.end.status = be16_to_cpu(mad->status);
 283		break;
 284	default:
 285		break;
 286
 287	}
 288}
 289
 290#else
 291#define ibmvfc_trc_start(evt) do { } while (0)
 292#define ibmvfc_trc_end(evt) do { } while (0)
 293#endif
 294
 295/**
 296 * ibmvfc_get_err_index - Find the index into cmd_status for the fcp response
 297 * @status:		status / error class
 298 * @error:		error
 299 *
 300 * Return value:
 301 *	index into cmd_status / -EINVAL on failure
 302 **/
 303static int ibmvfc_get_err_index(u16 status, u16 error)
 304{
 305	int i;
 306
 307	for (i = 0; i < ARRAY_SIZE(cmd_status); i++)
 308		if ((cmd_status[i].status & status) == cmd_status[i].status &&
 309		    cmd_status[i].error == error)
 310			return i;
 311
 312	return -EINVAL;
 313}
 314
 315/**
 316 * ibmvfc_get_cmd_error - Find the error description for the fcp response
 317 * @status:		status / error class
 318 * @error:		error
 319 *
 320 * Return value:
 321 *	error description string
 322 **/
 323static const char *ibmvfc_get_cmd_error(u16 status, u16 error)
 324{
 325	int rc = ibmvfc_get_err_index(status, error);
 326	if (rc >= 0)
 327		return cmd_status[rc].name;
 328	return unknown_error;
 329}
 330
 331/**
 332 * ibmvfc_get_err_result - Find the scsi status to return for the fcp response
 333 * @vhost:      ibmvfc host struct
 334 * @vfc_cmd:	ibmvfc command struct
 335 *
 336 * Return value:
 337 *	SCSI result value to return for completed command
 338 **/
 339static int ibmvfc_get_err_result(struct ibmvfc_host *vhost, struct ibmvfc_cmd *vfc_cmd)
 340{
 341	int err;
 342	struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd);
 343	int fc_rsp_len = be32_to_cpu(rsp->fcp_rsp_len);
 344
 345	if ((rsp->flags & FCP_RSP_LEN_VALID) &&
 346	    ((fc_rsp_len && fc_rsp_len != 4 && fc_rsp_len != 8) ||
 347	     rsp->data.info.rsp_code))
 348		return DID_ERROR << 16;
 349
 350	err = ibmvfc_get_err_index(be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error));
 351	if (err >= 0)
 352		return rsp->scsi_status | (cmd_status[err].result << 16);
 353	return rsp->scsi_status | (DID_ERROR << 16);
 354}
 355
 356/**
 357 * ibmvfc_retry_cmd - Determine if error status is retryable
 358 * @status:		status / error class
 359 * @error:		error
 360 *
 361 * Return value:
 362 *	1 if error should be retried / 0 if it should not
 363 **/
 364static int ibmvfc_retry_cmd(u16 status, u16 error)
 365{
 366	int rc = ibmvfc_get_err_index(status, error);
 367
 368	if (rc >= 0)
 369		return cmd_status[rc].retry;
 370	return 1;
 371}
 372
 373static const char *unknown_fc_explain = "unknown fc explain";
 374
 375static const struct {
 376	u16 fc_explain;
 377	char *name;
 378} ls_explain [] = {
 379	{ 0x00, "no additional explanation" },
 380	{ 0x01, "service parameter error - options" },
 381	{ 0x03, "service parameter error - initiator control" },
 382	{ 0x05, "service parameter error - recipient control" },
 383	{ 0x07, "service parameter error - received data field size" },
 384	{ 0x09, "service parameter error - concurrent seq" },
 385	{ 0x0B, "service parameter error - credit" },
 386	{ 0x0D, "invalid N_Port/F_Port_Name" },
 387	{ 0x0E, "invalid node/Fabric Name" },
 388	{ 0x0F, "invalid common service parameters" },
 389	{ 0x11, "invalid association header" },
 390	{ 0x13, "association header required" },
 391	{ 0x15, "invalid originator S_ID" },
 392	{ 0x17, "invalid OX_ID-RX-ID combination" },
 393	{ 0x19, "command (request) already in progress" },
 394	{ 0x1E, "N_Port Login requested" },
 395	{ 0x1F, "Invalid N_Port_ID" },
 396};
 397
 398static const struct {
 399	u16 fc_explain;
 400	char *name;
 401} gs_explain [] = {
 402	{ 0x00, "no additional explanation" },
 403	{ 0x01, "port identifier not registered" },
 404	{ 0x02, "port name not registered" },
 405	{ 0x03, "node name not registered" },
 406	{ 0x04, "class of service not registered" },
 407	{ 0x06, "initial process associator not registered" },
 408	{ 0x07, "FC-4 TYPEs not registered" },
 409	{ 0x08, "symbolic port name not registered" },
 410	{ 0x09, "symbolic node name not registered" },
 411	{ 0x0A, "port type not registered" },
 412	{ 0xF0, "authorization exception" },
 413	{ 0xF1, "authentication exception" },
 414	{ 0xF2, "data base full" },
 415	{ 0xF3, "data base empty" },
 416	{ 0xF4, "processing request" },
 417	{ 0xF5, "unable to verify connection" },
 418	{ 0xF6, "devices not in a common zone" },
 419};
 420
 421/**
 422 * ibmvfc_get_ls_explain - Return the FC Explain description text
 423 * @status:	FC Explain status
 424 *
 425 * Returns:
 426 *	error string
 427 **/
 428static const char *ibmvfc_get_ls_explain(u16 status)
 429{
 430	int i;
 431
 432	for (i = 0; i < ARRAY_SIZE(ls_explain); i++)
 433		if (ls_explain[i].fc_explain == status)
 434			return ls_explain[i].name;
 435
 436	return unknown_fc_explain;
 437}
 438
 439/**
 440 * ibmvfc_get_gs_explain - Return the FC Explain description text
 441 * @status:	FC Explain status
 442 *
 443 * Returns:
 444 *	error string
 445 **/
 446static const char *ibmvfc_get_gs_explain(u16 status)
 447{
 448	int i;
 449
 450	for (i = 0; i < ARRAY_SIZE(gs_explain); i++)
 451		if (gs_explain[i].fc_explain == status)
 452			return gs_explain[i].name;
 453
 454	return unknown_fc_explain;
 455}
 456
 457static const struct {
 458	enum ibmvfc_fc_type fc_type;
 459	char *name;
 460} fc_type [] = {
 461	{ IBMVFC_FABRIC_REJECT, "fabric reject" },
 462	{ IBMVFC_PORT_REJECT, "port reject" },
 463	{ IBMVFC_LS_REJECT, "ELS reject" },
 464	{ IBMVFC_FABRIC_BUSY, "fabric busy" },
 465	{ IBMVFC_PORT_BUSY, "port busy" },
 466	{ IBMVFC_BASIC_REJECT, "basic reject" },
 467};
 468
 469static const char *unknown_fc_type = "unknown fc type";
 470
 471/**
 472 * ibmvfc_get_fc_type - Return the FC Type description text
 473 * @status:	FC Type error status
 474 *
 475 * Returns:
 476 *	error string
 477 **/
 478static const char *ibmvfc_get_fc_type(u16 status)
 479{
 480	int i;
 481
 482	for (i = 0; i < ARRAY_SIZE(fc_type); i++)
 483		if (fc_type[i].fc_type == status)
 484			return fc_type[i].name;
 485
 486	return unknown_fc_type;
 487}
 488
 489/**
 490 * ibmvfc_set_tgt_action - Set the next init action for the target
 491 * @tgt:		ibmvfc target struct
 492 * @action:		action to perform
 493 *
 494 * Returns:
 495 *	0 if action changed / non-zero if not changed
 496 **/
 497static int ibmvfc_set_tgt_action(struct ibmvfc_target *tgt,
 498				  enum ibmvfc_target_action action)
 499{
 500	int rc = -EINVAL;
 501
 502	switch (tgt->action) {
 503	case IBMVFC_TGT_ACTION_LOGOUT_RPORT:
 504		if (action == IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT ||
 505		    action == IBMVFC_TGT_ACTION_DEL_RPORT) {
 506			tgt->action = action;
 507			rc = 0;
 508		}
 509		break;
 510	case IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT:
 511		if (action == IBMVFC_TGT_ACTION_DEL_RPORT ||
 512		    action == IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT) {
 513			tgt->action = action;
 514			rc = 0;
 515		}
 516		break;
 517	case IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT:
 518		if (action == IBMVFC_TGT_ACTION_LOGOUT_RPORT) {
 519			tgt->action = action;
 520			rc = 0;
 521		}
 522		break;
 523	case IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT:
 524		if (action == IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT) {
 525			tgt->action = action;
 526			rc = 0;
 527		}
 528		break;
 529	case IBMVFC_TGT_ACTION_DEL_RPORT:
 530		if (action == IBMVFC_TGT_ACTION_DELETED_RPORT) {
 531			tgt->action = action;
 532			rc = 0;
 533		}
 534		break;
 535	case IBMVFC_TGT_ACTION_DELETED_RPORT:
 536		break;
 537	default:
 
 
 538		tgt->action = action;
 539		rc = 0;
 540		break;
 541	}
 542
 543	if (action >= IBMVFC_TGT_ACTION_LOGOUT_RPORT)
 544		tgt->add_rport = 0;
 545
 546	return rc;
 547}
 548
 549/**
 550 * ibmvfc_set_host_state - Set the state for the host
 551 * @vhost:		ibmvfc host struct
 552 * @state:		state to set host to
 553 *
 554 * Returns:
 555 *	0 if state changed / non-zero if not changed
 556 **/
 557static int ibmvfc_set_host_state(struct ibmvfc_host *vhost,
 558				  enum ibmvfc_host_state state)
 559{
 560	int rc = 0;
 561
 562	switch (vhost->state) {
 563	case IBMVFC_HOST_OFFLINE:
 564		rc = -EINVAL;
 565		break;
 566	default:
 567		vhost->state = state;
 568		break;
 569	}
 570
 571	return rc;
 572}
 573
 574/**
 575 * ibmvfc_set_host_action - Set the next init action for the host
 576 * @vhost:		ibmvfc host struct
 577 * @action:		action to perform
 578 *
 579 **/
 580static void ibmvfc_set_host_action(struct ibmvfc_host *vhost,
 581				   enum ibmvfc_host_action action)
 582{
 583	switch (action) {
 584	case IBMVFC_HOST_ACTION_ALLOC_TGTS:
 585		if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT)
 586			vhost->action = action;
 587		break;
 588	case IBMVFC_HOST_ACTION_LOGO_WAIT:
 589		if (vhost->action == IBMVFC_HOST_ACTION_LOGO)
 590			vhost->action = action;
 591		break;
 592	case IBMVFC_HOST_ACTION_INIT_WAIT:
 593		if (vhost->action == IBMVFC_HOST_ACTION_INIT)
 594			vhost->action = action;
 595		break;
 596	case IBMVFC_HOST_ACTION_QUERY:
 597		switch (vhost->action) {
 598		case IBMVFC_HOST_ACTION_INIT_WAIT:
 599		case IBMVFC_HOST_ACTION_NONE:
 600		case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
 601			vhost->action = action;
 602			break;
 603		default:
 604			break;
 605		}
 606		break;
 607	case IBMVFC_HOST_ACTION_TGT_INIT:
 608		if (vhost->action == IBMVFC_HOST_ACTION_ALLOC_TGTS)
 609			vhost->action = action;
 610		break;
 611	case IBMVFC_HOST_ACTION_REENABLE:
 612	case IBMVFC_HOST_ACTION_RESET:
 613		vhost->action = action;
 614		break;
 615	case IBMVFC_HOST_ACTION_INIT:
 616	case IBMVFC_HOST_ACTION_TGT_DEL:
 617	case IBMVFC_HOST_ACTION_LOGO:
 618	case IBMVFC_HOST_ACTION_QUERY_TGTS:
 619	case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
 620	case IBMVFC_HOST_ACTION_NONE:
 621	default:
 622		switch (vhost->action) {
 623		case IBMVFC_HOST_ACTION_RESET:
 624		case IBMVFC_HOST_ACTION_REENABLE:
 625			break;
 626		default:
 627			vhost->action = action;
 628			break;
 629		}
 630		break;
 
 
 
 
 
 
 
 
 
 631	}
 632}
 633
 634/**
 635 * ibmvfc_reinit_host - Re-start host initialization (no NPIV Login)
 636 * @vhost:		ibmvfc host struct
 637 *
 638 * Return value:
 639 *	nothing
 640 **/
 641static void ibmvfc_reinit_host(struct ibmvfc_host *vhost)
 642{
 643	if (vhost->action == IBMVFC_HOST_ACTION_NONE &&
 644	    vhost->state == IBMVFC_ACTIVE) {
 645		if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
 646			scsi_block_requests(vhost->host);
 647			ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
 648		}
 649	} else
 650		vhost->reinit = 1;
 651
 652	wake_up(&vhost->work_wait_q);
 653}
 654
 655/**
 656 * ibmvfc_del_tgt - Schedule cleanup and removal of the target
 657 * @tgt:		ibmvfc target struct
 658 **/
 659static void ibmvfc_del_tgt(struct ibmvfc_target *tgt)
 660{
 661	if (!ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_LOGOUT_RPORT)) {
 662		tgt->job_step = ibmvfc_tgt_implicit_logout_and_del;
 663		tgt->init_retries = 0;
 664	}
 665	wake_up(&tgt->vhost->work_wait_q);
 666}
 667
 668/**
 669 * ibmvfc_link_down - Handle a link down event from the adapter
 670 * @vhost:	ibmvfc host struct
 671 * @state:	ibmvfc host state to enter
 672 *
 673 **/
 674static void ibmvfc_link_down(struct ibmvfc_host *vhost,
 675			     enum ibmvfc_host_state state)
 676{
 677	struct ibmvfc_target *tgt;
 678
 679	ENTER;
 680	scsi_block_requests(vhost->host);
 681	list_for_each_entry(tgt, &vhost->targets, queue)
 682		ibmvfc_del_tgt(tgt);
 683	ibmvfc_set_host_state(vhost, state);
 684	ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
 685	vhost->events_to_log |= IBMVFC_AE_LINKDOWN;
 686	wake_up(&vhost->work_wait_q);
 687	LEAVE;
 688}
 689
 690/**
 691 * ibmvfc_init_host - Start host initialization
 692 * @vhost:		ibmvfc host struct
 693 *
 694 * Return value:
 695 *	nothing
 696 **/
 697static void ibmvfc_init_host(struct ibmvfc_host *vhost)
 698{
 699	struct ibmvfc_target *tgt;
 700
 701	if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
 702		if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
 703			dev_err(vhost->dev,
 704				"Host initialization retries exceeded. Taking adapter offline\n");
 705			ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
 706			return;
 707		}
 708	}
 709
 710	if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
 711		memset(vhost->async_crq.msgs.async, 0, PAGE_SIZE);
 712		vhost->async_crq.cur = 0;
 713
 714		list_for_each_entry(tgt, &vhost->targets, queue) {
 715			if (vhost->client_migrated)
 716				tgt->need_login = 1;
 717			else
 718				ibmvfc_del_tgt(tgt);
 719		}
 720
 721		scsi_block_requests(vhost->host);
 722		ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
 723		vhost->job_step = ibmvfc_npiv_login;
 724		wake_up(&vhost->work_wait_q);
 725	}
 726}
 727
 728/**
 729 * ibmvfc_send_crq - Send a CRQ
 730 * @vhost:	ibmvfc host struct
 731 * @word1:	the first 64 bits of the data
 732 * @word2:	the second 64 bits of the data
 733 *
 734 * Return value:
 735 *	0 on success / other on failure
 736 **/
 737static int ibmvfc_send_crq(struct ibmvfc_host *vhost, u64 word1, u64 word2)
 738{
 739	struct vio_dev *vdev = to_vio_dev(vhost->dev);
 740	return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
 741}
 742
 743static int ibmvfc_send_sub_crq(struct ibmvfc_host *vhost, u64 cookie, u64 word1,
 744			       u64 word2, u64 word3, u64 word4)
 745{
 746	struct vio_dev *vdev = to_vio_dev(vhost->dev);
 747
 748	return plpar_hcall_norets(H_SEND_SUB_CRQ, vdev->unit_address, cookie,
 749				  word1, word2, word3, word4);
 750}
 751
 752/**
 753 * ibmvfc_send_crq_init - Send a CRQ init message
 754 * @vhost:	ibmvfc host struct
 755 *
 756 * Return value:
 757 *	0 on success / other on failure
 758 **/
 759static int ibmvfc_send_crq_init(struct ibmvfc_host *vhost)
 760{
 761	ibmvfc_dbg(vhost, "Sending CRQ init\n");
 762	return ibmvfc_send_crq(vhost, 0xC001000000000000LL, 0);
 763}
 764
 765/**
 766 * ibmvfc_send_crq_init_complete - Send a CRQ init complete message
 767 * @vhost:	ibmvfc host struct
 768 *
 769 * Return value:
 770 *	0 on success / other on failure
 771 **/
 772static int ibmvfc_send_crq_init_complete(struct ibmvfc_host *vhost)
 773{
 774	ibmvfc_dbg(vhost, "Sending CRQ init complete\n");
 775	return ibmvfc_send_crq(vhost, 0xC002000000000000LL, 0);
 776}
 777
 778/**
 779 * ibmvfc_init_event_pool - Allocates and initializes the event pool for a host
 780 * @vhost:	ibmvfc host who owns the event pool
 781 * @queue:      ibmvfc queue struct
 782 *
 783 * Returns zero on success.
 784 **/
 785static int ibmvfc_init_event_pool(struct ibmvfc_host *vhost,
 786				  struct ibmvfc_queue *queue)
 787{
 788	int i;
 789	struct ibmvfc_event_pool *pool = &queue->evt_pool;
 790
 791	ENTER;
 792	if (!queue->total_depth)
 793		return 0;
 794
 795	pool->size = queue->total_depth;
 796	pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);
 797	if (!pool->events)
 798		return -ENOMEM;
 799
 800	pool->iu_storage = dma_alloc_coherent(vhost->dev,
 801					      pool->size * sizeof(*pool->iu_storage),
 802					      &pool->iu_token, 0);
 803
 804	if (!pool->iu_storage) {
 805		kfree(pool->events);
 806		return -ENOMEM;
 807	}
 808
 809	INIT_LIST_HEAD(&queue->sent);
 810	INIT_LIST_HEAD(&queue->free);
 811	queue->evt_free = queue->evt_depth;
 812	queue->reserved_free = queue->reserved_depth;
 813	spin_lock_init(&queue->l_lock);
 814
 815	for (i = 0; i < pool->size; ++i) {
 816		struct ibmvfc_event *evt = &pool->events[i];
 817
 818		/*
 819		 * evt->active states
 820		 *  1 = in flight
 821		 *  0 = being completed
 822		 * -1 = free/freed
 823		 */
 824		atomic_set(&evt->active, -1);
 825		atomic_set(&evt->free, 1);
 826		evt->crq.valid = 0x80;
 827		evt->crq.ioba = cpu_to_be64(pool->iu_token + (sizeof(*evt->xfer_iu) * i));
 828		evt->xfer_iu = pool->iu_storage + i;
 829		evt->vhost = vhost;
 830		evt->queue = queue;
 831		evt->ext_list = NULL;
 832		list_add_tail(&evt->queue_list, &queue->free);
 833	}
 834
 835	LEAVE;
 836	return 0;
 837}
 838
 839/**
 840 * ibmvfc_free_event_pool - Frees memory of the event pool of a host
 841 * @vhost:	ibmvfc host who owns the event pool
 842 * @queue:      ibmvfc queue struct
 843 *
 844 **/
 845static void ibmvfc_free_event_pool(struct ibmvfc_host *vhost,
 846				   struct ibmvfc_queue *queue)
 847{
 848	int i;
 849	struct ibmvfc_event_pool *pool = &queue->evt_pool;
 850
 851	ENTER;
 852	for (i = 0; i < pool->size; ++i) {
 853		list_del(&pool->events[i].queue_list);
 854		BUG_ON(atomic_read(&pool->events[i].free) != 1);
 855		if (pool->events[i].ext_list)
 856			dma_pool_free(vhost->sg_pool,
 857				      pool->events[i].ext_list,
 858				      pool->events[i].ext_list_token);
 859	}
 860
 861	kfree(pool->events);
 862	dma_free_coherent(vhost->dev,
 863			  pool->size * sizeof(*pool->iu_storage),
 864			  pool->iu_storage, pool->iu_token);
 865	LEAVE;
 866}
 867
 868/**
 869 * ibmvfc_free_queue - Deallocate queue
 870 * @vhost:	ibmvfc host struct
 871 * @queue:	ibmvfc queue struct
 872 *
 873 * Unmaps dma and deallocates page for messages
 874 **/
 875static void ibmvfc_free_queue(struct ibmvfc_host *vhost,
 876			      struct ibmvfc_queue *queue)
 877{
 878	struct device *dev = vhost->dev;
 879
 880	dma_unmap_single(dev, queue->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
 881	free_page((unsigned long)queue->msgs.handle);
 882	queue->msgs.handle = NULL;
 883
 884	ibmvfc_free_event_pool(vhost, queue);
 885}
 886
 887/**
 888 * ibmvfc_release_crq_queue - Deallocates data and unregisters CRQ
 889 * @vhost:	ibmvfc host struct
 890 *
 891 * Frees irq, deallocates a page for messages, unmaps dma, and unregisters
 892 * the crq with the hypervisor.
 893 **/
 894static void ibmvfc_release_crq_queue(struct ibmvfc_host *vhost)
 895{
 896	long rc = 0;
 897	struct vio_dev *vdev = to_vio_dev(vhost->dev);
 898	struct ibmvfc_queue *crq = &vhost->crq;
 899
 900	ibmvfc_dbg(vhost, "Releasing CRQ\n");
 901	free_irq(vdev->irq, vhost);
 902	tasklet_kill(&vhost->tasklet);
 903	do {
 904		if (rc)
 905			msleep(100);
 906		rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
 907	} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
 908
 909	vhost->state = IBMVFC_NO_CRQ;
 910	vhost->logged_in = 0;
 911
 912	ibmvfc_free_queue(vhost, crq);
 913}
 914
 915/**
 916 * ibmvfc_reenable_crq_queue - reenables the CRQ
 917 * @vhost:	ibmvfc host struct
 918 *
 919 * Return value:
 920 *	0 on success / other on failure
 921 **/
 922static int ibmvfc_reenable_crq_queue(struct ibmvfc_host *vhost)
 923{
 924	int rc = 0;
 925	struct vio_dev *vdev = to_vio_dev(vhost->dev);
 926	unsigned long flags;
 927
 928	ibmvfc_dereg_sub_crqs(vhost, &vhost->scsi_scrqs);
 929
 930	/* Re-enable the CRQ */
 931	do {
 932		if (rc)
 933			msleep(100);
 934		rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
 935	} while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));
 936
 937	if (rc)
 938		dev_err(vhost->dev, "Error enabling adapter (rc=%d)\n", rc);
 939
 940	spin_lock_irqsave(vhost->host->host_lock, flags);
 941	spin_lock(vhost->crq.q_lock);
 942	vhost->do_enquiry = 1;
 943	vhost->using_channels = 0;
 944	spin_unlock(vhost->crq.q_lock);
 945	spin_unlock_irqrestore(vhost->host->host_lock, flags);
 946
 947	ibmvfc_reg_sub_crqs(vhost, &vhost->scsi_scrqs);
 948
 949	return rc;
 950}
 951
 952/**
 953 * ibmvfc_reset_crq - resets a crq after a failure
 954 * @vhost:	ibmvfc host struct
 955 *
 956 * Return value:
 957 *	0 on success / other on failure
 958 **/
 959static int ibmvfc_reset_crq(struct ibmvfc_host *vhost)
 960{
 961	int rc = 0;
 962	unsigned long flags;
 963	struct vio_dev *vdev = to_vio_dev(vhost->dev);
 964	struct ibmvfc_queue *crq = &vhost->crq;
 965
 966	ibmvfc_dereg_sub_crqs(vhost, &vhost->scsi_scrqs);
 967
 968	/* Close the CRQ */
 969	do {
 970		if (rc)
 971			msleep(100);
 972		rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
 973	} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
 974
 975	spin_lock_irqsave(vhost->host->host_lock, flags);
 976	spin_lock(vhost->crq.q_lock);
 977	vhost->state = IBMVFC_NO_CRQ;
 978	vhost->logged_in = 0;
 979	vhost->do_enquiry = 1;
 980	vhost->using_channels = 0;
 981
 982	/* Clean out the queue */
 983	memset(crq->msgs.crq, 0, PAGE_SIZE);
 984	crq->cur = 0;
 985
 986	/* And re-open it again */
 987	rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
 988				crq->msg_token, PAGE_SIZE);
 989
 990	if (rc == H_CLOSED)
 991		/* Adapter is good, but other end is not ready */
 992		dev_warn(vhost->dev, "Partner adapter not ready\n");
 993	else if (rc != 0)
 994		dev_warn(vhost->dev, "Couldn't register crq (rc=%d)\n", rc);
 995
 996	spin_unlock(vhost->crq.q_lock);
 997	spin_unlock_irqrestore(vhost->host->host_lock, flags);
 998
 999	ibmvfc_reg_sub_crqs(vhost, &vhost->scsi_scrqs);
1000
1001	return rc;
1002}
1003
1004/**
1005 * ibmvfc_valid_event - Determines if event is valid.
1006 * @pool:	event_pool that contains the event
1007 * @evt:	ibmvfc event to be checked for validity
1008 *
1009 * Return value:
1010 *	1 if event is valid / 0 if event is not valid
1011 **/
1012static int ibmvfc_valid_event(struct ibmvfc_event_pool *pool,
1013			      struct ibmvfc_event *evt)
1014{
1015	int index = evt - pool->events;
1016	if (index < 0 || index >= pool->size)	/* outside of bounds */
1017		return 0;
1018	if (evt != pool->events + index)	/* unaligned */
1019		return 0;
1020	return 1;
1021}
1022
1023/**
1024 * ibmvfc_free_event - Free the specified event
1025 * @evt:	ibmvfc_event to be freed
1026 *
1027 **/
1028static void ibmvfc_free_event(struct ibmvfc_event *evt)
1029{
1030	struct ibmvfc_event_pool *pool = &evt->queue->evt_pool;
1031	unsigned long flags;
1032
1033	BUG_ON(!ibmvfc_valid_event(pool, evt));
1034	BUG_ON(atomic_inc_return(&evt->free) != 1);
1035	BUG_ON(atomic_dec_and_test(&evt->active));
1036
1037	spin_lock_irqsave(&evt->queue->l_lock, flags);
1038	list_add_tail(&evt->queue_list, &evt->queue->free);
1039	if (evt->reserved) {
1040		evt->reserved = 0;
1041		evt->queue->reserved_free++;
1042	} else {
1043		evt->queue->evt_free++;
1044	}
1045	if (evt->eh_comp)
1046		complete(evt->eh_comp);
1047	spin_unlock_irqrestore(&evt->queue->l_lock, flags);
1048}
1049
1050/**
1051 * ibmvfc_scsi_eh_done - EH done function for queuecommand commands
1052 * @evt:	ibmvfc event struct
1053 *
1054 * This function does not setup any error status, that must be done
1055 * before this function gets called.
1056 **/
1057static void ibmvfc_scsi_eh_done(struct ibmvfc_event *evt)
1058{
1059	struct scsi_cmnd *cmnd = evt->cmnd;
1060
1061	if (cmnd) {
1062		scsi_dma_unmap(cmnd);
1063		scsi_done(cmnd);
1064	}
1065
1066	ibmvfc_free_event(evt);
1067}
1068
1069/**
1070 * ibmvfc_complete_purge - Complete failed command list
1071 * @purge_list:		list head of failed commands
1072 *
1073 * This function runs completions on commands to fail as a result of a
1074 * host reset or platform migration.
1075 **/
1076static void ibmvfc_complete_purge(struct list_head *purge_list)
1077{
1078	struct ibmvfc_event *evt, *pos;
1079
1080	list_for_each_entry_safe(evt, pos, purge_list, queue_list) {
1081		list_del(&evt->queue_list);
1082		ibmvfc_trc_end(evt);
1083		evt->done(evt);
1084	}
1085}
1086
1087/**
1088 * ibmvfc_fail_request - Fail request with specified error code
1089 * @evt:		ibmvfc event struct
1090 * @error_code:	error code to fail request with
1091 *
1092 * Return value:
1093 *	none
1094 **/
1095static void ibmvfc_fail_request(struct ibmvfc_event *evt, int error_code)
1096{
1097	/*
1098	 * Anything we are failing should still be active. Otherwise, it
1099	 * implies we already got a response for the command and are doing
1100	 * something bad like double completing it.
1101	 */
1102	BUG_ON(!atomic_dec_and_test(&evt->active));
1103	if (evt->cmnd) {
1104		evt->cmnd->result = (error_code << 16);
1105		evt->done = ibmvfc_scsi_eh_done;
1106	} else
1107		evt->xfer_iu->mad_common.status = cpu_to_be16(IBMVFC_MAD_DRIVER_FAILED);
1108
 
1109	del_timer(&evt->timer);
 
 
1110}
1111
1112/**
1113 * ibmvfc_purge_requests - Our virtual adapter just shut down. Purge any sent requests
1114 * @vhost:		ibmvfc host struct
1115 * @error_code:	error code to fail requests with
1116 *
1117 * Return value:
1118 *	none
1119 **/
1120static void ibmvfc_purge_requests(struct ibmvfc_host *vhost, int error_code)
1121{
1122	struct ibmvfc_event *evt, *pos;
1123	struct ibmvfc_queue *queues = vhost->scsi_scrqs.scrqs;
1124	unsigned long flags;
1125	int hwqs = 0;
1126	int i;
1127
1128	if (vhost->using_channels)
1129		hwqs = vhost->scsi_scrqs.active_queues;
1130
1131	ibmvfc_dbg(vhost, "Purging all requests\n");
1132	spin_lock_irqsave(&vhost->crq.l_lock, flags);
1133	list_for_each_entry_safe(evt, pos, &vhost->crq.sent, queue_list)
1134		ibmvfc_fail_request(evt, error_code);
1135	list_splice_init(&vhost->crq.sent, &vhost->purge);
1136	spin_unlock_irqrestore(&vhost->crq.l_lock, flags);
1137
1138	for (i = 0; i < hwqs; i++) {
1139		spin_lock_irqsave(queues[i].q_lock, flags);
1140		spin_lock(&queues[i].l_lock);
1141		list_for_each_entry_safe(evt, pos, &queues[i].sent, queue_list)
1142			ibmvfc_fail_request(evt, error_code);
1143		list_splice_init(&queues[i].sent, &vhost->purge);
1144		spin_unlock(&queues[i].l_lock);
1145		spin_unlock_irqrestore(queues[i].q_lock, flags);
1146	}
1147}
1148
1149/**
1150 * ibmvfc_hard_reset_host - Reset the connection to the server by breaking the CRQ
1151 * @vhost:	struct ibmvfc host to reset
1152 **/
1153static void ibmvfc_hard_reset_host(struct ibmvfc_host *vhost)
1154{
1155	ibmvfc_purge_requests(vhost, DID_ERROR);
1156	ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
1157	ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
1158}
1159
1160/**
1161 * __ibmvfc_reset_host - Reset the connection to the server (no locking)
1162 * @vhost:	struct ibmvfc host to reset
1163 **/
1164static void __ibmvfc_reset_host(struct ibmvfc_host *vhost)
1165{
1166	if (vhost->logged_in && vhost->action != IBMVFC_HOST_ACTION_LOGO_WAIT &&
1167	    !ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
1168		scsi_block_requests(vhost->host);
1169		ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO);
1170		vhost->job_step = ibmvfc_npiv_logout;
1171		wake_up(&vhost->work_wait_q);
1172	} else
1173		ibmvfc_hard_reset_host(vhost);
1174}
1175
1176/**
1177 * ibmvfc_reset_host - Reset the connection to the server
1178 * @vhost:	ibmvfc host struct
1179 **/
1180static void ibmvfc_reset_host(struct ibmvfc_host *vhost)
1181{
1182	unsigned long flags;
1183
1184	spin_lock_irqsave(vhost->host->host_lock, flags);
1185	__ibmvfc_reset_host(vhost);
1186	spin_unlock_irqrestore(vhost->host->host_lock, flags);
1187}
1188
1189/**
1190 * ibmvfc_retry_host_init - Retry host initialization if allowed
1191 * @vhost:	ibmvfc host struct
1192 *
1193 * Returns: 1 if init will be retried / 0 if not
1194 *
1195 **/
1196static int ibmvfc_retry_host_init(struct ibmvfc_host *vhost)
1197{
1198	int retry = 0;
1199
1200	if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
1201		vhost->delay_init = 1;
1202		if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
1203			dev_err(vhost->dev,
1204				"Host initialization retries exceeded. Taking adapter offline\n");
1205			ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
1206		} else if (vhost->init_retries == IBMVFC_MAX_HOST_INIT_RETRIES)
1207			__ibmvfc_reset_host(vhost);
1208		else {
1209			ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
1210			retry = 1;
1211		}
1212	}
1213
1214	wake_up(&vhost->work_wait_q);
1215	return retry;
1216}
1217
1218/**
1219 * __ibmvfc_get_target - Find the specified scsi_target (no locking)
1220 * @starget:	scsi target struct
1221 *
1222 * Return value:
1223 *	ibmvfc_target struct / NULL if not found
1224 **/
1225static struct ibmvfc_target *__ibmvfc_get_target(struct scsi_target *starget)
1226{
1227	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1228	struct ibmvfc_host *vhost = shost_priv(shost);
1229	struct ibmvfc_target *tgt;
1230
1231	list_for_each_entry(tgt, &vhost->targets, queue)
1232		if (tgt->target_id == starget->id) {
1233			kref_get(&tgt->kref);
1234			return tgt;
1235		}
1236	return NULL;
1237}
1238
1239/**
1240 * ibmvfc_get_target - Find the specified scsi_target
1241 * @starget:	scsi target struct
1242 *
1243 * Return value:
1244 *	ibmvfc_target struct / NULL if not found
1245 **/
1246static struct ibmvfc_target *ibmvfc_get_target(struct scsi_target *starget)
1247{
1248	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1249	struct ibmvfc_target *tgt;
1250	unsigned long flags;
1251
1252	spin_lock_irqsave(shost->host_lock, flags);
1253	tgt = __ibmvfc_get_target(starget);
1254	spin_unlock_irqrestore(shost->host_lock, flags);
1255	return tgt;
1256}
1257
1258/**
1259 * ibmvfc_get_host_speed - Get host port speed
1260 * @shost:		scsi host struct
1261 *
1262 * Return value:
1263 * 	none
1264 **/
1265static void ibmvfc_get_host_speed(struct Scsi_Host *shost)
1266{
1267	struct ibmvfc_host *vhost = shost_priv(shost);
1268	unsigned long flags;
1269
1270	spin_lock_irqsave(shost->host_lock, flags);
1271	if (vhost->state == IBMVFC_ACTIVE) {
1272		switch (be64_to_cpu(vhost->login_buf->resp.link_speed) / 100) {
1273		case 1:
1274			fc_host_speed(shost) = FC_PORTSPEED_1GBIT;
1275			break;
1276		case 2:
1277			fc_host_speed(shost) = FC_PORTSPEED_2GBIT;
1278			break;
1279		case 4:
1280			fc_host_speed(shost) = FC_PORTSPEED_4GBIT;
1281			break;
1282		case 8:
1283			fc_host_speed(shost) = FC_PORTSPEED_8GBIT;
1284			break;
1285		case 10:
1286			fc_host_speed(shost) = FC_PORTSPEED_10GBIT;
1287			break;
1288		case 16:
1289			fc_host_speed(shost) = FC_PORTSPEED_16GBIT;
1290			break;
1291		default:
1292			ibmvfc_log(vhost, 3, "Unknown port speed: %lld Gbit\n",
1293				   be64_to_cpu(vhost->login_buf->resp.link_speed) / 100);
1294			fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
1295			break;
1296		}
1297	} else
1298		fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
1299	spin_unlock_irqrestore(shost->host_lock, flags);
1300}
1301
1302/**
1303 * ibmvfc_get_host_port_state - Get host port state
1304 * @shost:		scsi host struct
1305 *
1306 * Return value:
1307 * 	none
1308 **/
1309static void ibmvfc_get_host_port_state(struct Scsi_Host *shost)
1310{
1311	struct ibmvfc_host *vhost = shost_priv(shost);
1312	unsigned long flags;
1313
1314	spin_lock_irqsave(shost->host_lock, flags);
1315	switch (vhost->state) {
1316	case IBMVFC_INITIALIZING:
1317	case IBMVFC_ACTIVE:
1318		fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
1319		break;
1320	case IBMVFC_LINK_DOWN:
1321		fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
1322		break;
1323	case IBMVFC_LINK_DEAD:
1324	case IBMVFC_HOST_OFFLINE:
1325		fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE;
1326		break;
1327	case IBMVFC_HALTED:
1328		fc_host_port_state(shost) = FC_PORTSTATE_BLOCKED;
1329		break;
1330	case IBMVFC_NO_CRQ:
1331		fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
1332		break;
1333	default:
1334		ibmvfc_log(vhost, 3, "Unknown port state: %d\n", vhost->state);
1335		fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
1336		break;
1337	}
1338	spin_unlock_irqrestore(shost->host_lock, flags);
1339}
1340
1341/**
1342 * ibmvfc_set_rport_dev_loss_tmo - Set rport's device loss timeout
1343 * @rport:		rport struct
1344 * @timeout:	timeout value
1345 *
1346 * Return value:
1347 * 	none
1348 **/
1349static void ibmvfc_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
1350{
1351	if (timeout)
1352		rport->dev_loss_tmo = timeout;
1353	else
1354		rport->dev_loss_tmo = 1;
1355}
1356
1357/**
1358 * ibmvfc_release_tgt - Free memory allocated for a target
1359 * @kref:		kref struct
1360 *
1361 **/
1362static void ibmvfc_release_tgt(struct kref *kref)
1363{
1364	struct ibmvfc_target *tgt = container_of(kref, struct ibmvfc_target, kref);
1365	kfree(tgt);
1366}
1367
1368/**
1369 * ibmvfc_get_starget_node_name - Get SCSI target's node name
1370 * @starget:	scsi target struct
1371 *
1372 * Return value:
1373 * 	none
1374 **/
1375static void ibmvfc_get_starget_node_name(struct scsi_target *starget)
1376{
1377	struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1378	fc_starget_port_name(starget) = tgt ? tgt->ids.node_name : 0;
1379	if (tgt)
1380		kref_put(&tgt->kref, ibmvfc_release_tgt);
1381}
1382
1383/**
1384 * ibmvfc_get_starget_port_name - Get SCSI target's port name
1385 * @starget:	scsi target struct
1386 *
1387 * Return value:
1388 * 	none
1389 **/
1390static void ibmvfc_get_starget_port_name(struct scsi_target *starget)
1391{
1392	struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1393	fc_starget_port_name(starget) = tgt ? tgt->ids.port_name : 0;
1394	if (tgt)
1395		kref_put(&tgt->kref, ibmvfc_release_tgt);
1396}
1397
1398/**
1399 * ibmvfc_get_starget_port_id - Get SCSI target's port ID
1400 * @starget:	scsi target struct
1401 *
1402 * Return value:
1403 * 	none
1404 **/
1405static void ibmvfc_get_starget_port_id(struct scsi_target *starget)
1406{
1407	struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1408	fc_starget_port_id(starget) = tgt ? tgt->scsi_id : -1;
1409	if (tgt)
1410		kref_put(&tgt->kref, ibmvfc_release_tgt);
1411}
1412
1413/**
1414 * ibmvfc_wait_while_resetting - Wait while the host resets
1415 * @vhost:		ibmvfc host struct
1416 *
1417 * Return value:
1418 * 	0 on success / other on failure
1419 **/
1420static int ibmvfc_wait_while_resetting(struct ibmvfc_host *vhost)
1421{
1422	long timeout = wait_event_timeout(vhost->init_wait_q,
1423					  ((vhost->state == IBMVFC_ACTIVE ||
1424					    vhost->state == IBMVFC_HOST_OFFLINE ||
1425					    vhost->state == IBMVFC_LINK_DEAD) &&
1426					   vhost->action == IBMVFC_HOST_ACTION_NONE),
1427					  (init_timeout * HZ));
1428
1429	return timeout ? 0 : -EIO;
1430}
1431
1432/**
1433 * ibmvfc_issue_fc_host_lip - Re-initiate link initialization
1434 * @shost:		scsi host struct
1435 *
1436 * Return value:
1437 * 	0 on success / other on failure
1438 **/
1439static int ibmvfc_issue_fc_host_lip(struct Scsi_Host *shost)
1440{
1441	struct ibmvfc_host *vhost = shost_priv(shost);
1442
1443	dev_err(vhost->dev, "Initiating host LIP. Resetting connection\n");
1444	ibmvfc_reset_host(vhost);
1445	return ibmvfc_wait_while_resetting(vhost);
1446}
1447
1448/**
1449 * ibmvfc_gather_partition_info - Gather info about the LPAR
1450 * @vhost:      ibmvfc host struct
1451 *
1452 * Return value:
1453 *	none
1454 **/
1455static void ibmvfc_gather_partition_info(struct ibmvfc_host *vhost)
1456{
1457	struct device_node *rootdn;
1458	const char *name;
1459	const unsigned int *num;
1460
1461	rootdn = of_find_node_by_path("/");
1462	if (!rootdn)
1463		return;
1464
1465	name = of_get_property(rootdn, "ibm,partition-name", NULL);
1466	if (name)
1467		strscpy(vhost->partition_name, name, sizeof(vhost->partition_name));
1468	num = of_get_property(rootdn, "ibm,partition-no", NULL);
1469	if (num)
1470		vhost->partition_number = *num;
1471	of_node_put(rootdn);
1472}
1473
1474/**
1475 * ibmvfc_set_login_info - Setup info for NPIV login
1476 * @vhost:	ibmvfc host struct
1477 *
1478 * Return value:
1479 *	none
1480 **/
1481static void ibmvfc_set_login_info(struct ibmvfc_host *vhost)
1482{
1483	struct ibmvfc_npiv_login *login_info = &vhost->login_info;
1484	struct ibmvfc_queue *async_crq = &vhost->async_crq;
1485	struct device_node *of_node = vhost->dev->of_node;
1486	const char *location;
1487	u16 max_cmds;
1488
1489	max_cmds = scsi_qdepth + IBMVFC_NUM_INTERNAL_REQ;
1490	if (mq_enabled)
1491		max_cmds += (scsi_qdepth + IBMVFC_NUM_INTERNAL_SUBQ_REQ) *
1492			vhost->scsi_scrqs.desired_queues;
1493
1494	memset(login_info, 0, sizeof(*login_info));
1495
1496	login_info->ostype = cpu_to_be32(IBMVFC_OS_LINUX);
1497	login_info->max_dma_len = cpu_to_be64(IBMVFC_MAX_SECTORS << 9);
1498	login_info->max_payload = cpu_to_be32(sizeof(struct ibmvfc_fcp_cmd_iu));
1499	login_info->max_response = cpu_to_be32(sizeof(struct ibmvfc_fcp_rsp));
1500	login_info->partition_num = cpu_to_be32(vhost->partition_number);
1501	login_info->vfc_frame_version = cpu_to_be32(1);
1502	login_info->fcp_version = cpu_to_be16(3);
1503	login_info->flags = cpu_to_be16(IBMVFC_FLUSH_ON_HALT);
1504	if (vhost->client_migrated)
1505		login_info->flags |= cpu_to_be16(IBMVFC_CLIENT_MIGRATED);
1506
1507	login_info->max_cmds = cpu_to_be32(max_cmds);
1508	login_info->capabilities = cpu_to_be64(IBMVFC_CAN_MIGRATE | IBMVFC_CAN_SEND_VF_WWPN);
1509
1510	if (vhost->mq_enabled || vhost->using_channels)
1511		login_info->capabilities |= cpu_to_be64(IBMVFC_CAN_USE_CHANNELS);
1512
1513	login_info->async.va = cpu_to_be64(vhost->async_crq.msg_token);
1514	login_info->async.len = cpu_to_be32(async_crq->size *
1515					    sizeof(*async_crq->msgs.async));
1516	strscpy(login_info->partition_name, vhost->partition_name,
1517		sizeof(login_info->partition_name));
1518
1519	strscpy(login_info->device_name,
1520		dev_name(&vhost->host->shost_gendev), sizeof(login_info->device_name));
1521
1522	location = of_get_property(of_node, "ibm,loc-code", NULL);
1523	location = location ? location : dev_name(vhost->dev);
1524	strscpy(login_info->drc_name, location, sizeof(login_info->drc_name));
1525}
1526
1527/**
1528 * __ibmvfc_get_event - Gets the next free event in pool
1529 * @queue:      ibmvfc queue struct
1530 * @reserved:	event is for a reserved management command
1531 *
1532 * Returns a free event from the pool.
1533 **/
1534static struct ibmvfc_event *__ibmvfc_get_event(struct ibmvfc_queue *queue, int reserved)
1535{
1536	struct ibmvfc_event *evt = NULL;
1537	unsigned long flags;
1538
1539	spin_lock_irqsave(&queue->l_lock, flags);
1540	if (reserved && queue->reserved_free) {
1541		evt = list_entry(queue->free.next, struct ibmvfc_event, queue_list);
1542		evt->reserved = 1;
1543		queue->reserved_free--;
1544	} else if (queue->evt_free) {
1545		evt = list_entry(queue->free.next, struct ibmvfc_event, queue_list);
1546		queue->evt_free--;
1547	} else {
1548		goto out;
 
 
 
1549	}
1550
1551	atomic_set(&evt->free, 0);
1552	list_del(&evt->queue_list);
1553out:
1554	spin_unlock_irqrestore(&queue->l_lock, flags);
1555	return evt;
 
 
 
 
 
 
 
 
1556}
1557
1558#define ibmvfc_get_event(queue) __ibmvfc_get_event(queue, 0)
1559#define ibmvfc_get_reserved_event(queue) __ibmvfc_get_event(queue, 1)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1560
1561/**
1562 * ibmvfc_locked_done - Calls evt completion with host_lock held
1563 * @evt:	ibmvfc evt to complete
1564 *
1565 * All non-scsi command completion callbacks have the expectation that the
1566 * host_lock is held. This callback is used by ibmvfc_init_event to wrap a
1567 * MAD evt with the host_lock.
1568 **/
1569static void ibmvfc_locked_done(struct ibmvfc_event *evt)
1570{
1571	unsigned long flags;
1572
1573	spin_lock_irqsave(evt->vhost->host->host_lock, flags);
1574	evt->_done(evt);
1575	spin_unlock_irqrestore(evt->vhost->host->host_lock, flags);
 
 
1576}
1577
1578/**
1579 * ibmvfc_init_event - Initialize fields in an event struct that are always
1580 *				required.
1581 * @evt:	The event
1582 * @done:	Routine to call when the event is responded to
1583 * @format:	SRP or MAD format
1584 **/
1585static void ibmvfc_init_event(struct ibmvfc_event *evt,
1586			      void (*done) (struct ibmvfc_event *), u8 format)
1587{
1588	evt->cmnd = NULL;
1589	evt->sync_iu = NULL;
1590	evt->eh_comp = NULL;
1591	evt->crq.format = format;
1592	if (format == IBMVFC_CMD_FORMAT)
1593		evt->done = done;
1594	else {
1595		evt->_done = done;
1596		evt->done = ibmvfc_locked_done;
1597	}
1598	evt->hwq = 0;
1599}
1600
1601/**
1602 * ibmvfc_map_sg_list - Initialize scatterlist
1603 * @scmd:	scsi command struct
1604 * @nseg:	number of scatterlist segments
1605 * @md:	memory descriptor list to initialize
1606 **/
1607static void ibmvfc_map_sg_list(struct scsi_cmnd *scmd, int nseg,
1608			       struct srp_direct_buf *md)
1609{
1610	int i;
1611	struct scatterlist *sg;
1612
1613	scsi_for_each_sg(scmd, sg, nseg, i) {
1614		md[i].va = cpu_to_be64(sg_dma_address(sg));
1615		md[i].len = cpu_to_be32(sg_dma_len(sg));
1616		md[i].key = 0;
1617	}
1618}
1619
1620/**
1621 * ibmvfc_map_sg_data - Maps dma for a scatterlist and initializes descriptor fields
1622 * @scmd:		struct scsi_cmnd with the scatterlist
1623 * @evt:		ibmvfc event struct
1624 * @vfc_cmd:	vfc_cmd that contains the memory descriptor
1625 * @dev:		device for which to map dma memory
1626 *
1627 * Returns:
1628 *	0 on success / non-zero on failure
1629 **/
1630static int ibmvfc_map_sg_data(struct scsi_cmnd *scmd,
1631			      struct ibmvfc_event *evt,
1632			      struct ibmvfc_cmd *vfc_cmd, struct device *dev)
1633{
1634
1635	int sg_mapped;
1636	struct srp_direct_buf *data = &vfc_cmd->ioba;
1637	struct ibmvfc_host *vhost = dev_get_drvdata(dev);
1638	struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(evt->vhost, vfc_cmd);
1639
1640	if (cls3_error)
1641		vfc_cmd->flags |= cpu_to_be16(IBMVFC_CLASS_3_ERR);
1642
1643	sg_mapped = scsi_dma_map(scmd);
1644	if (!sg_mapped) {
1645		vfc_cmd->flags |= cpu_to_be16(IBMVFC_NO_MEM_DESC);
1646		return 0;
1647	} else if (unlikely(sg_mapped < 0)) {
1648		if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1649			scmd_printk(KERN_ERR, scmd, "Failed to map DMA buffer for command\n");
1650		return sg_mapped;
1651	}
1652
1653	if (scmd->sc_data_direction == DMA_TO_DEVICE) {
1654		vfc_cmd->flags |= cpu_to_be16(IBMVFC_WRITE);
1655		iu->add_cdb_len |= IBMVFC_WRDATA;
1656	} else {
1657		vfc_cmd->flags |= cpu_to_be16(IBMVFC_READ);
1658		iu->add_cdb_len |= IBMVFC_RDDATA;
1659	}
1660
1661	if (sg_mapped == 1) {
1662		ibmvfc_map_sg_list(scmd, sg_mapped, data);
1663		return 0;
1664	}
1665
1666	vfc_cmd->flags |= cpu_to_be16(IBMVFC_SCATTERLIST);
1667
1668	if (!evt->ext_list) {
1669		evt->ext_list = dma_pool_alloc(vhost->sg_pool, GFP_ATOMIC,
1670					       &evt->ext_list_token);
1671
1672		if (!evt->ext_list) {
1673			scsi_dma_unmap(scmd);
1674			if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1675				scmd_printk(KERN_ERR, scmd, "Can't allocate memory for scatterlist\n");
1676			return -ENOMEM;
1677		}
1678	}
1679
1680	ibmvfc_map_sg_list(scmd, sg_mapped, evt->ext_list);
1681
1682	data->va = cpu_to_be64(evt->ext_list_token);
1683	data->len = cpu_to_be32(sg_mapped * sizeof(struct srp_direct_buf));
1684	data->key = 0;
1685	return 0;
1686}
1687
1688/**
1689 * ibmvfc_timeout - Internal command timeout handler
1690 * @t:	struct ibmvfc_event that timed out
1691 *
1692 * Called when an internally generated command times out
1693 **/
1694static void ibmvfc_timeout(struct timer_list *t)
1695{
1696	struct ibmvfc_event *evt = from_timer(evt, t, timer);
1697	struct ibmvfc_host *vhost = evt->vhost;
1698	dev_err(vhost->dev, "Command timed out (%p). Resetting connection\n", evt);
1699	ibmvfc_reset_host(vhost);
1700}
1701
1702/**
1703 * ibmvfc_send_event - Transforms event to u64 array and calls send_crq()
1704 * @evt:		event to be sent
1705 * @vhost:		ibmvfc host struct
1706 * @timeout:	timeout in seconds - 0 means do not time command
1707 *
1708 * Returns the value returned from ibmvfc_send_crq(). (Zero for success)
1709 **/
1710static int ibmvfc_send_event(struct ibmvfc_event *evt,
1711			     struct ibmvfc_host *vhost, unsigned long timeout)
1712{
1713	__be64 *crq_as_u64 = (__be64 *) &evt->crq;
1714	unsigned long flags;
1715	int rc;
1716
1717	/* Copy the IU into the transfer area */
1718	*evt->xfer_iu = evt->iu;
1719	if (evt->crq.format == IBMVFC_CMD_FORMAT)
1720		evt->xfer_iu->cmd.tag = cpu_to_be64((u64)evt);
1721	else if (evt->crq.format == IBMVFC_MAD_FORMAT)
1722		evt->xfer_iu->mad_common.tag = cpu_to_be64((u64)evt);
1723	else
1724		BUG();
1725
 
1726	timer_setup(&evt->timer, ibmvfc_timeout, 0);
1727
1728	if (timeout) {
1729		evt->timer.expires = jiffies + (timeout * HZ);
1730		add_timer(&evt->timer);
1731	}
1732
1733	spin_lock_irqsave(&evt->queue->l_lock, flags);
1734	list_add_tail(&evt->queue_list, &evt->queue->sent);
1735	atomic_set(&evt->active, 1);
1736
1737	mb();
1738
1739	if (evt->queue->fmt == IBMVFC_SUB_CRQ_FMT)
1740		rc = ibmvfc_send_sub_crq(vhost,
1741					 evt->queue->vios_cookie,
1742					 be64_to_cpu(crq_as_u64[0]),
1743					 be64_to_cpu(crq_as_u64[1]),
1744					 0, 0);
1745	else
1746		rc = ibmvfc_send_crq(vhost, be64_to_cpu(crq_as_u64[0]),
1747				     be64_to_cpu(crq_as_u64[1]));
1748
1749	if (rc) {
1750		atomic_set(&evt->active, 0);
1751		list_del(&evt->queue_list);
1752		spin_unlock_irqrestore(&evt->queue->l_lock, flags);
1753		del_timer(&evt->timer);
1754
1755		/* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
1756		 * Firmware will send a CRQ with a transport event (0xFF) to
1757		 * tell this client what has happened to the transport. This
1758		 * will be handled in ibmvfc_handle_crq()
1759		 */
1760		if (rc == H_CLOSED) {
1761			if (printk_ratelimit())
1762				dev_warn(vhost->dev, "Send warning. Receive queue closed, will retry.\n");
1763			if (evt->cmnd)
1764				scsi_dma_unmap(evt->cmnd);
1765			ibmvfc_free_event(evt);
1766			return SCSI_MLQUEUE_HOST_BUSY;
1767		}
1768
1769		dev_err(vhost->dev, "Send error (rc=%d)\n", rc);
1770		if (evt->cmnd) {
1771			evt->cmnd->result = DID_ERROR << 16;
1772			evt->done = ibmvfc_scsi_eh_done;
1773		} else
1774			evt->xfer_iu->mad_common.status = cpu_to_be16(IBMVFC_MAD_CRQ_ERROR);
1775
1776		evt->done(evt);
1777	} else {
1778		spin_unlock_irqrestore(&evt->queue->l_lock, flags);
1779		ibmvfc_trc_start(evt);
1780	}
1781
1782	return 0;
1783}
1784
1785/**
1786 * ibmvfc_log_error - Log an error for the failed command if appropriate
1787 * @evt:	ibmvfc event to log
1788 *
1789 **/
1790static void ibmvfc_log_error(struct ibmvfc_event *evt)
1791{
1792	struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1793	struct ibmvfc_host *vhost = evt->vhost;
1794	struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd);
1795	struct scsi_cmnd *cmnd = evt->cmnd;
1796	const char *err = unknown_error;
1797	int index = ibmvfc_get_err_index(be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error));
1798	int logerr = 0;
1799	int rsp_code = 0;
1800
1801	if (index >= 0) {
1802		logerr = cmd_status[index].log;
1803		err = cmd_status[index].name;
1804	}
1805
1806	if (!logerr && (vhost->log_level <= (IBMVFC_DEFAULT_LOG_LEVEL + 1)))
1807		return;
1808
1809	if (rsp->flags & FCP_RSP_LEN_VALID)
1810		rsp_code = rsp->data.info.rsp_code;
1811
1812	scmd_printk(KERN_ERR, cmnd, "Command (%02X) : %s (%x:%x) "
1813		    "flags: %x fcp_rsp: %x, resid=%d, scsi_status: %x\n",
1814		    cmnd->cmnd[0], err, be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error),
1815		    rsp->flags, rsp_code, scsi_get_resid(cmnd), rsp->scsi_status);
1816}
1817
1818/**
1819 * ibmvfc_relogin - Log back into the specified device
1820 * @sdev:	scsi device struct
1821 *
1822 **/
1823static void ibmvfc_relogin(struct scsi_device *sdev)
1824{
1825	struct ibmvfc_host *vhost = shost_priv(sdev->host);
1826	struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1827	struct ibmvfc_target *tgt;
1828	unsigned long flags;
1829
1830	spin_lock_irqsave(vhost->host->host_lock, flags);
1831	list_for_each_entry(tgt, &vhost->targets, queue) {
1832		if (rport == tgt->rport) {
1833			ibmvfc_del_tgt(tgt);
1834			break;
1835		}
1836	}
1837
1838	ibmvfc_reinit_host(vhost);
1839	spin_unlock_irqrestore(vhost->host->host_lock, flags);
1840}
1841
1842/**
1843 * ibmvfc_scsi_done - Handle responses from commands
1844 * @evt:	ibmvfc event to be handled
1845 *
1846 * Used as a callback when sending scsi cmds.
1847 **/
1848static void ibmvfc_scsi_done(struct ibmvfc_event *evt)
1849{
1850	struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1851	struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(evt->vhost, vfc_cmd);
1852	struct scsi_cmnd *cmnd = evt->cmnd;
1853	u32 rsp_len = 0;
1854	u32 sense_len = be32_to_cpu(rsp->fcp_sense_len);
1855
1856	if (cmnd) {
1857		if (be16_to_cpu(vfc_cmd->response_flags) & IBMVFC_ADAPTER_RESID_VALID)
1858			scsi_set_resid(cmnd, be32_to_cpu(vfc_cmd->adapter_resid));
1859		else if (rsp->flags & FCP_RESID_UNDER)
1860			scsi_set_resid(cmnd, be32_to_cpu(rsp->fcp_resid));
1861		else
1862			scsi_set_resid(cmnd, 0);
1863
1864		if (vfc_cmd->status) {
1865			cmnd->result = ibmvfc_get_err_result(evt->vhost, vfc_cmd);
1866
1867			if (rsp->flags & FCP_RSP_LEN_VALID)
1868				rsp_len = be32_to_cpu(rsp->fcp_rsp_len);
1869			if ((sense_len + rsp_len) > SCSI_SENSE_BUFFERSIZE)
1870				sense_len = SCSI_SENSE_BUFFERSIZE - rsp_len;
1871			if ((rsp->flags & FCP_SNS_LEN_VALID) && rsp->fcp_sense_len && rsp_len <= 8)
1872				memcpy(cmnd->sense_buffer, rsp->data.sense + rsp_len, sense_len);
1873			if ((be16_to_cpu(vfc_cmd->status) & IBMVFC_VIOS_FAILURE) &&
1874			    (be16_to_cpu(vfc_cmd->error) == IBMVFC_PLOGI_REQUIRED))
1875				ibmvfc_relogin(cmnd->device);
1876
1877			if (!cmnd->result && (!scsi_get_resid(cmnd) || (rsp->flags & FCP_RESID_OVER)))
1878				cmnd->result = (DID_ERROR << 16);
1879
1880			ibmvfc_log_error(evt);
1881		}
1882
1883		if (!cmnd->result &&
1884		    (scsi_bufflen(cmnd) - scsi_get_resid(cmnd) < cmnd->underflow))
1885			cmnd->result = (DID_ERROR << 16);
1886
1887		scsi_dma_unmap(cmnd);
1888		scsi_done(cmnd);
1889	}
1890
 
 
 
1891	ibmvfc_free_event(evt);
1892}
1893
1894/**
1895 * ibmvfc_host_chkready - Check if the host can accept commands
1896 * @vhost:	 struct ibmvfc host
1897 *
1898 * Returns:
1899 *	1 if host can accept command / 0 if not
1900 **/
1901static inline int ibmvfc_host_chkready(struct ibmvfc_host *vhost)
1902{
1903	int result = 0;
1904
1905	switch (vhost->state) {
1906	case IBMVFC_LINK_DEAD:
1907	case IBMVFC_HOST_OFFLINE:
1908		result = DID_NO_CONNECT << 16;
1909		break;
1910	case IBMVFC_NO_CRQ:
1911	case IBMVFC_INITIALIZING:
1912	case IBMVFC_HALTED:
1913	case IBMVFC_LINK_DOWN:
1914		result = DID_REQUEUE << 16;
1915		break;
1916	case IBMVFC_ACTIVE:
1917		result = 0;
1918		break;
1919	}
1920
1921	return result;
1922}
1923
1924static struct ibmvfc_cmd *ibmvfc_init_vfc_cmd(struct ibmvfc_event *evt, struct scsi_device *sdev)
1925{
1926	struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1927	struct ibmvfc_host *vhost = evt->vhost;
1928	struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd;
1929	struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd);
1930	struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd);
1931	size_t offset;
1932
1933	memset(vfc_cmd, 0, sizeof(*vfc_cmd));
1934	if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
1935		offset = offsetof(struct ibmvfc_cmd, v2.rsp);
1936		vfc_cmd->target_wwpn = cpu_to_be64(rport->port_name);
1937	} else
1938		offset = offsetof(struct ibmvfc_cmd, v1.rsp);
1939	vfc_cmd->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offset);
1940	vfc_cmd->resp.len = cpu_to_be32(sizeof(*rsp));
1941	vfc_cmd->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE);
1942	vfc_cmd->payload_len = cpu_to_be32(sizeof(*iu));
1943	vfc_cmd->resp_len = cpu_to_be32(sizeof(*rsp));
1944	vfc_cmd->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
1945	vfc_cmd->tgt_scsi_id = cpu_to_be64(rport->port_id);
1946	int_to_scsilun(sdev->lun, &iu->lun);
1947
1948	return vfc_cmd;
1949}
1950
1951/**
1952 * ibmvfc_queuecommand - The queuecommand function of the scsi template
1953 * @shost:	scsi host struct
1954 * @cmnd:	struct scsi_cmnd to be executed
 
1955 *
1956 * Returns:
1957 *	0 on success / other on failure
1958 **/
1959static int ibmvfc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *cmnd)
 
1960{
1961	struct ibmvfc_host *vhost = shost_priv(shost);
1962	struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
1963	struct ibmvfc_cmd *vfc_cmd;
1964	struct ibmvfc_fcp_cmd_iu *iu;
1965	struct ibmvfc_event *evt;
1966	u32 tag_and_hwq = blk_mq_unique_tag(scsi_cmd_to_rq(cmnd));
1967	u16 hwq = blk_mq_unique_tag_to_hwq(tag_and_hwq);
1968	u16 scsi_channel;
1969	int rc;
1970
1971	if (unlikely((rc = fc_remote_port_chkready(rport))) ||
1972	    unlikely((rc = ibmvfc_host_chkready(vhost)))) {
1973		cmnd->result = rc;
1974		scsi_done(cmnd);
1975		return 0;
1976	}
1977
1978	cmnd->result = (DID_OK << 16);
1979	if (vhost->using_channels) {
1980		scsi_channel = hwq % vhost->scsi_scrqs.active_queues;
1981		evt = ibmvfc_get_event(&vhost->scsi_scrqs.scrqs[scsi_channel]);
1982		if (!evt)
1983			return SCSI_MLQUEUE_HOST_BUSY;
1984
1985		evt->hwq = hwq % vhost->scsi_scrqs.active_queues;
1986	} else {
1987		evt = ibmvfc_get_event(&vhost->crq);
1988		if (!evt)
1989			return SCSI_MLQUEUE_HOST_BUSY;
1990	}
1991
1992	ibmvfc_init_event(evt, ibmvfc_scsi_done, IBMVFC_CMD_FORMAT);
1993	evt->cmnd = cmnd;
1994
1995	vfc_cmd = ibmvfc_init_vfc_cmd(evt, cmnd->device);
1996	iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd);
1997
1998	iu->xfer_len = cpu_to_be32(scsi_bufflen(cmnd));
1999	memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len);
 
 
 
 
 
 
 
2000
2001	if (cmnd->flags & SCMD_TAGGED) {
2002		vfc_cmd->task_tag = cpu_to_be64(scsi_cmd_to_rq(cmnd)->tag);
2003		iu->pri_task_attr = IBMVFC_SIMPLE_TASK;
2004	}
2005
2006	vfc_cmd->correlation = cpu_to_be64((u64)evt);
2007
2008	if (likely(!(rc = ibmvfc_map_sg_data(cmnd, evt, vfc_cmd, vhost->dev))))
2009		return ibmvfc_send_event(evt, vhost, 0);
2010
2011	ibmvfc_free_event(evt);
2012	if (rc == -ENOMEM)
2013		return SCSI_MLQUEUE_HOST_BUSY;
2014
2015	if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2016		scmd_printk(KERN_ERR, cmnd,
2017			    "Failed to map DMA buffer for command. rc=%d\n", rc);
2018
2019	cmnd->result = DID_ERROR << 16;
2020	scsi_done(cmnd);
2021	return 0;
2022}
2023
 
 
2024/**
2025 * ibmvfc_sync_completion - Signal that a synchronous command has completed
2026 * @evt:	ibmvfc event struct
2027 *
2028 **/
2029static void ibmvfc_sync_completion(struct ibmvfc_event *evt)
2030{
2031	/* copy the response back */
2032	if (evt->sync_iu)
2033		*evt->sync_iu = *evt->xfer_iu;
2034
2035	complete(&evt->comp);
2036}
2037
2038/**
2039 * ibmvfc_bsg_timeout_done - Completion handler for cancelling BSG commands
2040 * @evt:	struct ibmvfc_event
2041 *
2042 **/
2043static void ibmvfc_bsg_timeout_done(struct ibmvfc_event *evt)
2044{
2045	struct ibmvfc_host *vhost = evt->vhost;
2046
2047	ibmvfc_free_event(evt);
2048	vhost->aborting_passthru = 0;
2049	dev_info(vhost->dev, "Passthru command cancelled\n");
2050}
2051
2052/**
2053 * ibmvfc_bsg_timeout - Handle a BSG timeout
2054 * @job:	struct bsg_job that timed out
2055 *
2056 * Returns:
2057 *	0 on success / other on failure
2058 **/
2059static int ibmvfc_bsg_timeout(struct bsg_job *job)
2060{
2061	struct ibmvfc_host *vhost = shost_priv(fc_bsg_to_shost(job));
2062	unsigned long port_id = (unsigned long)job->dd_data;
2063	struct ibmvfc_event *evt;
2064	struct ibmvfc_tmf *tmf;
2065	unsigned long flags;
2066	int rc;
2067
2068	ENTER;
2069	spin_lock_irqsave(vhost->host->host_lock, flags);
2070	if (vhost->aborting_passthru || vhost->state != IBMVFC_ACTIVE) {
2071		__ibmvfc_reset_host(vhost);
2072		spin_unlock_irqrestore(vhost->host->host_lock, flags);
2073		return 0;
2074	}
2075
2076	vhost->aborting_passthru = 1;
2077	evt = ibmvfc_get_reserved_event(&vhost->crq);
2078	if (!evt) {
2079		spin_unlock_irqrestore(vhost->host->host_lock, flags);
2080		return -ENOMEM;
2081	}
2082
2083	ibmvfc_init_event(evt, ibmvfc_bsg_timeout_done, IBMVFC_MAD_FORMAT);
2084
2085	tmf = &evt->iu.tmf;
2086	memset(tmf, 0, sizeof(*tmf));
2087	tmf->common.version = cpu_to_be32(1);
2088	tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
2089	tmf->common.length = cpu_to_be16(sizeof(*tmf));
2090	tmf->scsi_id = cpu_to_be64(port_id);
2091	tmf->cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY);
2092	tmf->my_cancel_key = cpu_to_be32(IBMVFC_INTERNAL_CANCEL_KEY);
2093	rc = ibmvfc_send_event(evt, vhost, default_timeout);
2094
2095	if (rc != 0) {
2096		vhost->aborting_passthru = 0;
2097		dev_err(vhost->dev, "Failed to send cancel event. rc=%d\n", rc);
2098		rc = -EIO;
2099	} else
2100		dev_info(vhost->dev, "Cancelling passthru command to port id 0x%lx\n",
2101			 port_id);
2102
2103	spin_unlock_irqrestore(vhost->host->host_lock, flags);
2104
2105	LEAVE;
2106	return rc;
2107}
2108
2109/**
2110 * ibmvfc_bsg_plogi - PLOGI into a target to handle a BSG command
2111 * @vhost:		struct ibmvfc_host to send command
2112 * @port_id:	port ID to send command
2113 *
2114 * Returns:
2115 *	0 on success / other on failure
2116 **/
2117static int ibmvfc_bsg_plogi(struct ibmvfc_host *vhost, unsigned int port_id)
2118{
2119	struct ibmvfc_port_login *plogi;
2120	struct ibmvfc_target *tgt;
2121	struct ibmvfc_event *evt;
2122	union ibmvfc_iu rsp_iu;
2123	unsigned long flags;
2124	int rc = 0, issue_login = 1;
2125
2126	ENTER;
2127	spin_lock_irqsave(vhost->host->host_lock, flags);
2128	list_for_each_entry(tgt, &vhost->targets, queue) {
2129		if (tgt->scsi_id == port_id) {
2130			issue_login = 0;
2131			break;
2132		}
2133	}
2134
2135	if (!issue_login)
2136		goto unlock_out;
2137	if (unlikely((rc = ibmvfc_host_chkready(vhost))))
2138		goto unlock_out;
2139
2140	evt = ibmvfc_get_reserved_event(&vhost->crq);
2141	if (!evt) {
2142		rc = -ENOMEM;
2143		goto unlock_out;
2144	}
2145	ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
2146	plogi = &evt->iu.plogi;
2147	memset(plogi, 0, sizeof(*plogi));
2148	plogi->common.version = cpu_to_be32(1);
2149	plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN);
2150	plogi->common.length = cpu_to_be16(sizeof(*plogi));
2151	plogi->scsi_id = cpu_to_be64(port_id);
2152	evt->sync_iu = &rsp_iu;
2153	init_completion(&evt->comp);
2154
2155	rc = ibmvfc_send_event(evt, vhost, default_timeout);
2156	spin_unlock_irqrestore(vhost->host->host_lock, flags);
2157
2158	if (rc)
2159		return -EIO;
2160
2161	wait_for_completion(&evt->comp);
2162
2163	if (rsp_iu.plogi.common.status)
2164		rc = -EIO;
2165
2166	spin_lock_irqsave(vhost->host->host_lock, flags);
2167	ibmvfc_free_event(evt);
2168unlock_out:
2169	spin_unlock_irqrestore(vhost->host->host_lock, flags);
2170	LEAVE;
2171	return rc;
2172}
2173
2174/**
2175 * ibmvfc_bsg_request - Handle a BSG request
2176 * @job:	struct bsg_job to be executed
2177 *
2178 * Returns:
2179 *	0 on success / other on failure
2180 **/
2181static int ibmvfc_bsg_request(struct bsg_job *job)
2182{
2183	struct ibmvfc_host *vhost = shost_priv(fc_bsg_to_shost(job));
2184	struct fc_rport *rport = fc_bsg_to_rport(job);
2185	struct ibmvfc_passthru_mad *mad;
2186	struct ibmvfc_event *evt;
2187	union ibmvfc_iu rsp_iu;
2188	unsigned long flags, port_id = -1;
2189	struct fc_bsg_request *bsg_request = job->request;
2190	struct fc_bsg_reply *bsg_reply = job->reply;
2191	unsigned int code = bsg_request->msgcode;
2192	int rc = 0, req_seg, rsp_seg, issue_login = 0;
2193	u32 fc_flags, rsp_len;
2194
2195	ENTER;
2196	bsg_reply->reply_payload_rcv_len = 0;
2197	if (rport)
2198		port_id = rport->port_id;
2199
2200	switch (code) {
2201	case FC_BSG_HST_ELS_NOLOGIN:
2202		port_id = (bsg_request->rqst_data.h_els.port_id[0] << 16) |
2203			(bsg_request->rqst_data.h_els.port_id[1] << 8) |
2204			bsg_request->rqst_data.h_els.port_id[2];
2205		fallthrough;
2206	case FC_BSG_RPT_ELS:
2207		fc_flags = IBMVFC_FC_ELS;
2208		break;
2209	case FC_BSG_HST_CT:
2210		issue_login = 1;
2211		port_id = (bsg_request->rqst_data.h_ct.port_id[0] << 16) |
2212			(bsg_request->rqst_data.h_ct.port_id[1] << 8) |
2213			bsg_request->rqst_data.h_ct.port_id[2];
2214		fallthrough;
2215	case FC_BSG_RPT_CT:
2216		fc_flags = IBMVFC_FC_CT_IU;
2217		break;
2218	default:
2219		return -ENOTSUPP;
2220	}
2221
2222	if (port_id == -1)
2223		return -EINVAL;
2224	if (!mutex_trylock(&vhost->passthru_mutex))
2225		return -EBUSY;
2226
2227	job->dd_data = (void *)port_id;
2228	req_seg = dma_map_sg(vhost->dev, job->request_payload.sg_list,
2229			     job->request_payload.sg_cnt, DMA_TO_DEVICE);
2230
2231	if (!req_seg) {
2232		mutex_unlock(&vhost->passthru_mutex);
2233		return -ENOMEM;
2234	}
2235
2236	rsp_seg = dma_map_sg(vhost->dev, job->reply_payload.sg_list,
2237			     job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
2238
2239	if (!rsp_seg) {
2240		dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
2241			     job->request_payload.sg_cnt, DMA_TO_DEVICE);
2242		mutex_unlock(&vhost->passthru_mutex);
2243		return -ENOMEM;
2244	}
2245
2246	if (req_seg > 1 || rsp_seg > 1) {
2247		rc = -EINVAL;
2248		goto out;
2249	}
2250
2251	if (issue_login)
2252		rc = ibmvfc_bsg_plogi(vhost, port_id);
2253
2254	spin_lock_irqsave(vhost->host->host_lock, flags);
2255
2256	if (unlikely(rc || (rport && (rc = fc_remote_port_chkready(rport)))) ||
2257	    unlikely((rc = ibmvfc_host_chkready(vhost)))) {
2258		spin_unlock_irqrestore(vhost->host->host_lock, flags);
2259		goto out;
2260	}
2261
2262	evt = ibmvfc_get_reserved_event(&vhost->crq);
2263	if (!evt) {
2264		spin_unlock_irqrestore(vhost->host->host_lock, flags);
2265		rc = -ENOMEM;
2266		goto out;
2267	}
2268	ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
2269	mad = &evt->iu.passthru;
2270
2271	memset(mad, 0, sizeof(*mad));
2272	mad->common.version = cpu_to_be32(1);
2273	mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU);
2274	mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu));
2275
2276	mad->cmd_ioba.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) +
2277		offsetof(struct ibmvfc_passthru_mad, iu));
2278	mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu));
2279
2280	mad->iu.cmd_len = cpu_to_be32(job->request_payload.payload_len);
2281	mad->iu.rsp_len = cpu_to_be32(job->reply_payload.payload_len);
2282	mad->iu.flags = cpu_to_be32(fc_flags);
2283	mad->iu.cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY);
2284
2285	mad->iu.cmd.va = cpu_to_be64(sg_dma_address(job->request_payload.sg_list));
2286	mad->iu.cmd.len = cpu_to_be32(sg_dma_len(job->request_payload.sg_list));
2287	mad->iu.rsp.va = cpu_to_be64(sg_dma_address(job->reply_payload.sg_list));
2288	mad->iu.rsp.len = cpu_to_be32(sg_dma_len(job->reply_payload.sg_list));
2289	mad->iu.scsi_id = cpu_to_be64(port_id);
2290	mad->iu.tag = cpu_to_be64((u64)evt);
2291	rsp_len = be32_to_cpu(mad->iu.rsp.len);
2292
2293	evt->sync_iu = &rsp_iu;
2294	init_completion(&evt->comp);
2295	rc = ibmvfc_send_event(evt, vhost, 0);
2296	spin_unlock_irqrestore(vhost->host->host_lock, flags);
2297
2298	if (rc) {
2299		rc = -EIO;
2300		goto out;
2301	}
2302
2303	wait_for_completion(&evt->comp);
2304
2305	if (rsp_iu.passthru.common.status)
2306		rc = -EIO;
2307	else
2308		bsg_reply->reply_payload_rcv_len = rsp_len;
2309
2310	spin_lock_irqsave(vhost->host->host_lock, flags);
2311	ibmvfc_free_event(evt);
2312	spin_unlock_irqrestore(vhost->host->host_lock, flags);
2313	bsg_reply->result = rc;
2314	bsg_job_done(job, bsg_reply->result,
2315		       bsg_reply->reply_payload_rcv_len);
2316	rc = 0;
2317out:
2318	dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
2319		     job->request_payload.sg_cnt, DMA_TO_DEVICE);
2320	dma_unmap_sg(vhost->dev, job->reply_payload.sg_list,
2321		     job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
2322	mutex_unlock(&vhost->passthru_mutex);
2323	LEAVE;
2324	return rc;
2325}
2326
2327/**
2328 * ibmvfc_reset_device - Reset the device with the specified reset type
2329 * @sdev:	scsi device to reset
2330 * @type:	reset type
2331 * @desc:	reset type description for log messages
2332 *
2333 * Returns:
2334 *	0 on success / other on failure
2335 **/
2336static int ibmvfc_reset_device(struct scsi_device *sdev, int type, char *desc)
2337{
2338	struct ibmvfc_host *vhost = shost_priv(sdev->host);
2339	struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2340	struct ibmvfc_cmd *tmf;
2341	struct ibmvfc_event *evt = NULL;
2342	union ibmvfc_iu rsp_iu;
2343	struct ibmvfc_fcp_cmd_iu *iu;
2344	struct ibmvfc_fcp_rsp *fc_rsp = ibmvfc_get_fcp_rsp(vhost, &rsp_iu.cmd);
2345	int rsp_rc = -EBUSY;
2346	unsigned long flags;
2347	int rsp_code = 0;
2348
2349	spin_lock_irqsave(vhost->host->host_lock, flags);
2350	if (vhost->state == IBMVFC_ACTIVE) {
2351		if (vhost->using_channels)
2352			evt = ibmvfc_get_event(&vhost->scsi_scrqs.scrqs[0]);
2353		else
2354			evt = ibmvfc_get_event(&vhost->crq);
2355
2356		if (!evt) {
2357			spin_unlock_irqrestore(vhost->host->host_lock, flags);
2358			return -ENOMEM;
2359		}
2360
2361		ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
2362		tmf = ibmvfc_init_vfc_cmd(evt, sdev);
2363		iu = ibmvfc_get_fcp_iu(vhost, tmf);
2364
 
 
 
 
 
 
 
 
 
 
2365		tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF));
2366		if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN))
2367			tmf->target_wwpn = cpu_to_be64(rport->port_name);
2368		iu->tmf_flags = type;
2369		evt->sync_iu = &rsp_iu;
2370
2371		init_completion(&evt->comp);
2372		rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2373	}
2374	spin_unlock_irqrestore(vhost->host->host_lock, flags);
2375
2376	if (rsp_rc != 0) {
2377		sdev_printk(KERN_ERR, sdev, "Failed to send %s reset event. rc=%d\n",
2378			    desc, rsp_rc);
2379		return -EIO;
2380	}
2381
2382	sdev_printk(KERN_INFO, sdev, "Resetting %s\n", desc);
2383	wait_for_completion(&evt->comp);
2384
2385	if (rsp_iu.cmd.status)
2386		rsp_code = ibmvfc_get_err_result(vhost, &rsp_iu.cmd);
2387
2388	if (rsp_code) {
2389		if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2390			rsp_code = fc_rsp->data.info.rsp_code;
2391
2392		sdev_printk(KERN_ERR, sdev, "%s reset failed: %s (%x:%x) "
2393			    "flags: %x fcp_rsp: %x, scsi_status: %x\n", desc,
2394			    ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)),
2395			    be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error), fc_rsp->flags, rsp_code,
2396			    fc_rsp->scsi_status);
2397		rsp_rc = -EIO;
2398	} else
2399		sdev_printk(KERN_INFO, sdev, "%s reset successful\n", desc);
2400
2401	spin_lock_irqsave(vhost->host->host_lock, flags);
2402	ibmvfc_free_event(evt);
2403	spin_unlock_irqrestore(vhost->host->host_lock, flags);
2404	return rsp_rc;
2405}
2406
2407/**
2408 * ibmvfc_match_rport - Match function for specified remote port
2409 * @evt:	ibmvfc event struct
2410 * @rport:	device to match
2411 *
2412 * Returns:
2413 *	1 if event matches rport / 0 if event does not match rport
2414 **/
2415static int ibmvfc_match_rport(struct ibmvfc_event *evt, void *rport)
2416{
2417	struct fc_rport *cmd_rport;
2418
2419	if (evt->cmnd) {
2420		cmd_rport = starget_to_rport(scsi_target(evt->cmnd->device));
2421		if (cmd_rport == rport)
2422			return 1;
2423	}
2424	return 0;
2425}
2426
2427/**
2428 * ibmvfc_match_target - Match function for specified target
2429 * @evt:	ibmvfc event struct
2430 * @device:	device to match (starget)
2431 *
2432 * Returns:
2433 *	1 if event matches starget / 0 if event does not match starget
2434 **/
2435static int ibmvfc_match_target(struct ibmvfc_event *evt, void *device)
2436{
2437	if (evt->cmnd && scsi_target(evt->cmnd->device) == device)
2438		return 1;
2439	return 0;
2440}
2441
2442/**
2443 * ibmvfc_match_lun - Match function for specified LUN
2444 * @evt:	ibmvfc event struct
2445 * @device:	device to match (sdev)
2446 *
2447 * Returns:
2448 *	1 if event matches sdev / 0 if event does not match sdev
2449 **/
2450static int ibmvfc_match_lun(struct ibmvfc_event *evt, void *device)
2451{
2452	if (evt->cmnd && evt->cmnd->device == device)
2453		return 1;
2454	return 0;
2455}
2456
2457/**
2458 * ibmvfc_event_is_free - Check if event is free or not
2459 * @evt:	ibmvfc event struct
2460 *
2461 * Returns:
2462 *	true / false
2463 **/
2464static bool ibmvfc_event_is_free(struct ibmvfc_event *evt)
2465{
2466	struct ibmvfc_event *loop_evt;
2467
2468	list_for_each_entry(loop_evt, &evt->queue->free, queue_list)
2469		if (loop_evt == evt)
2470			return true;
2471
2472	return false;
2473}
2474
2475/**
2476 * ibmvfc_wait_for_ops - Wait for ops to complete
2477 * @vhost:	ibmvfc host struct
2478 * @device:	device to match (starget or sdev)
2479 * @match:	match function
2480 *
2481 * Returns:
2482 *	SUCCESS / FAILED
2483 **/
2484static int ibmvfc_wait_for_ops(struct ibmvfc_host *vhost, void *device,
2485			       int (*match) (struct ibmvfc_event *, void *))
2486{
2487	struct ibmvfc_event *evt;
2488	DECLARE_COMPLETION_ONSTACK(comp);
2489	int wait, i, q_index, q_size;
2490	unsigned long flags;
2491	signed long timeout = IBMVFC_ABORT_WAIT_TIMEOUT * HZ;
2492	struct ibmvfc_queue *queues;
2493
2494	ENTER;
2495	if (vhost->mq_enabled && vhost->using_channels) {
2496		queues = vhost->scsi_scrqs.scrqs;
2497		q_size = vhost->scsi_scrqs.active_queues;
2498	} else {
2499		queues = &vhost->crq;
2500		q_size = 1;
2501	}
2502
2503	do {
2504		wait = 0;
2505		spin_lock_irqsave(vhost->host->host_lock, flags);
2506		for (q_index = 0; q_index < q_size; q_index++) {
2507			spin_lock(&queues[q_index].l_lock);
2508			for (i = 0; i < queues[q_index].evt_pool.size; i++) {
2509				evt = &queues[q_index].evt_pool.events[i];
2510				if (!ibmvfc_event_is_free(evt)) {
2511					if (match(evt, device)) {
2512						evt->eh_comp = &comp;
2513						wait++;
2514					}
2515				}
2516			}
2517			spin_unlock(&queues[q_index].l_lock);
2518		}
2519		spin_unlock_irqrestore(vhost->host->host_lock, flags);
2520
2521		if (wait) {
2522			timeout = wait_for_completion_timeout(&comp, timeout);
2523
2524			if (!timeout) {
2525				wait = 0;
2526				spin_lock_irqsave(vhost->host->host_lock, flags);
2527				for (q_index = 0; q_index < q_size; q_index++) {
2528					spin_lock(&queues[q_index].l_lock);
2529					for (i = 0; i < queues[q_index].evt_pool.size; i++) {
2530						evt = &queues[q_index].evt_pool.events[i];
2531						if (!ibmvfc_event_is_free(evt)) {
2532							if (match(evt, device)) {
2533								evt->eh_comp = NULL;
2534								wait++;
2535							}
2536						}
2537					}
2538					spin_unlock(&queues[q_index].l_lock);
2539				}
2540				spin_unlock_irqrestore(vhost->host->host_lock, flags);
2541				if (wait)
2542					dev_err(vhost->dev, "Timed out waiting for aborted commands\n");
2543				LEAVE;
2544				return wait ? FAILED : SUCCESS;
2545			}
2546		}
2547	} while (wait);
2548
2549	LEAVE;
2550	return SUCCESS;
2551}
2552
2553static struct ibmvfc_event *ibmvfc_init_tmf(struct ibmvfc_queue *queue,
2554					    struct scsi_device *sdev,
2555					    int type)
 
 
 
 
 
 
 
 
 
2556{
2557	struct ibmvfc_host *vhost = shost_priv(sdev->host);
2558	struct scsi_target *starget = scsi_target(sdev);
2559	struct fc_rport *rport = starget_to_rport(starget);
2560	struct ibmvfc_event *evt;
2561	struct ibmvfc_tmf *tmf;
2562
2563	evt = ibmvfc_get_reserved_event(queue);
2564	if (!evt)
2565		return NULL;
2566	ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
2567
2568	tmf = &evt->iu.tmf;
2569	memset(tmf, 0, sizeof(*tmf));
2570	if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
2571		tmf->common.version = cpu_to_be32(2);
2572		tmf->target_wwpn = cpu_to_be64(rport->port_name);
2573	} else {
2574		tmf->common.version = cpu_to_be32(1);
2575	}
2576	tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
2577	tmf->common.length = cpu_to_be16(sizeof(*tmf));
2578	tmf->scsi_id = cpu_to_be64(rport->port_id);
2579	int_to_scsilun(sdev->lun, &tmf->lun);
2580	if (!ibmvfc_check_caps(vhost, IBMVFC_CAN_SUPPRESS_ABTS))
2581		type &= ~IBMVFC_TMF_SUPPRESS_ABTS;
2582	if (vhost->state == IBMVFC_ACTIVE)
2583		tmf->flags = cpu_to_be32((type | IBMVFC_TMF_LUA_VALID));
2584	else
2585		tmf->flags = cpu_to_be32(((type & IBMVFC_TMF_SUPPRESS_ABTS) | IBMVFC_TMF_LUA_VALID));
2586	tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
2587	tmf->my_cancel_key = cpu_to_be32((unsigned long)starget->hostdata);
2588
2589	init_completion(&evt->comp);
2590
2591	return evt;
2592}
2593
2594static int ibmvfc_cancel_all_mq(struct scsi_device *sdev, int type)
2595{
2596	struct ibmvfc_host *vhost = shost_priv(sdev->host);
2597	struct ibmvfc_event *evt, *found_evt, *temp;
2598	struct ibmvfc_queue *queues = vhost->scsi_scrqs.scrqs;
2599	unsigned long flags;
2600	int num_hwq, i;
2601	int fail = 0;
2602	LIST_HEAD(cancelq);
2603	u16 status;
2604
2605	ENTER;
2606	spin_lock_irqsave(vhost->host->host_lock, flags);
2607	num_hwq = vhost->scsi_scrqs.active_queues;
2608	for (i = 0; i < num_hwq; i++) {
2609		spin_lock(queues[i].q_lock);
2610		spin_lock(&queues[i].l_lock);
2611		found_evt = NULL;
2612		list_for_each_entry(evt, &queues[i].sent, queue_list) {
2613			if (evt->cmnd && evt->cmnd->device == sdev) {
2614				found_evt = evt;
2615				break;
2616			}
2617		}
2618		spin_unlock(&queues[i].l_lock);
2619
2620		if (found_evt && vhost->logged_in) {
2621			evt = ibmvfc_init_tmf(&queues[i], sdev, type);
2622			if (!evt) {
2623				spin_unlock(queues[i].q_lock);
2624				spin_unlock_irqrestore(vhost->host->host_lock, flags);
2625				return -ENOMEM;
2626			}
2627			evt->sync_iu = &queues[i].cancel_rsp;
2628			ibmvfc_send_event(evt, vhost, default_timeout);
2629			list_add_tail(&evt->cancel, &cancelq);
2630		}
2631
2632		spin_unlock(queues[i].q_lock);
2633	}
2634	spin_unlock_irqrestore(vhost->host->host_lock, flags);
2635
2636	if (list_empty(&cancelq)) {
2637		if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2638			sdev_printk(KERN_INFO, sdev, "No events found to cancel\n");
2639		return 0;
2640	}
2641
2642	sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n");
2643
2644	list_for_each_entry_safe(evt, temp, &cancelq, cancel) {
2645		wait_for_completion(&evt->comp);
2646		status = be16_to_cpu(evt->queue->cancel_rsp.mad_common.status);
2647		list_del(&evt->cancel);
2648		ibmvfc_free_event(evt);
2649
2650		if (status != IBMVFC_MAD_SUCCESS) {
2651			sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status);
2652			switch (status) {
2653			case IBMVFC_MAD_DRIVER_FAILED:
2654			case IBMVFC_MAD_CRQ_ERROR:
2655			/* Host adapter most likely going through reset, return success to
2656			 * the caller will wait for the command being cancelled to get returned
2657			 */
2658				break;
2659			default:
2660				fail = 1;
2661				break;
2662			}
2663		}
2664	}
2665
2666	if (fail)
2667		return -EIO;
2668
2669	sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n");
2670	LEAVE;
2671	return 0;
2672}
2673
2674static int ibmvfc_cancel_all_sq(struct scsi_device *sdev, int type)
2675{
2676	struct ibmvfc_host *vhost = shost_priv(sdev->host);
2677	struct ibmvfc_event *evt, *found_evt;
2678	union ibmvfc_iu rsp;
2679	int rsp_rc = -EBUSY;
2680	unsigned long flags;
2681	u16 status;
2682
2683	ENTER;
2684	found_evt = NULL;
2685	spin_lock_irqsave(vhost->host->host_lock, flags);
2686	spin_lock(&vhost->crq.l_lock);
2687	list_for_each_entry(evt, &vhost->crq.sent, queue_list) {
2688		if (evt->cmnd && evt->cmnd->device == sdev) {
2689			found_evt = evt;
2690			break;
2691		}
2692	}
2693	spin_unlock(&vhost->crq.l_lock);
2694
2695	if (!found_evt) {
2696		if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2697			sdev_printk(KERN_INFO, sdev, "No events found to cancel\n");
2698		spin_unlock_irqrestore(vhost->host->host_lock, flags);
2699		return 0;
2700	}
2701
2702	if (vhost->logged_in) {
2703		evt = ibmvfc_init_tmf(&vhost->crq, sdev, type);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2704		evt->sync_iu = &rsp;
 
2705		rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2706	}
2707
2708	spin_unlock_irqrestore(vhost->host->host_lock, flags);
2709
2710	if (rsp_rc != 0) {
2711		sdev_printk(KERN_ERR, sdev, "Failed to send cancel event. rc=%d\n", rsp_rc);
2712		/* If failure is received, the host adapter is most likely going
2713		 through reset, return success so the caller will wait for the command
2714		 being cancelled to get returned */
2715		return 0;
2716	}
2717
2718	sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n");
2719
2720	wait_for_completion(&evt->comp);
2721	status = be16_to_cpu(rsp.mad_common.status);
2722	spin_lock_irqsave(vhost->host->host_lock, flags);
2723	ibmvfc_free_event(evt);
2724	spin_unlock_irqrestore(vhost->host->host_lock, flags);
2725
2726	if (status != IBMVFC_MAD_SUCCESS) {
2727		sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status);
2728		switch (status) {
2729		case IBMVFC_MAD_DRIVER_FAILED:
2730		case IBMVFC_MAD_CRQ_ERROR:
2731			/* Host adapter most likely going through reset, return success to
2732			 the caller will wait for the command being cancelled to get returned */
2733			return 0;
2734		default:
2735			return -EIO;
2736		};
2737	}
2738
2739	sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n");
2740	return 0;
2741}
2742
2743/**
2744 * ibmvfc_cancel_all - Cancel all outstanding commands to the device
2745 * @sdev:	scsi device to cancel commands
2746 * @type:	type of error recovery being performed
2747 *
2748 * This sends a cancel to the VIOS for the specified device. This does
2749 * NOT send any abort to the actual device. That must be done separately.
2750 *
2751 * Returns:
2752 *	0 on success / other on failure
2753 **/
2754static int ibmvfc_cancel_all(struct scsi_device *sdev, int type)
2755{
2756	struct ibmvfc_host *vhost = shost_priv(sdev->host);
2757
2758	if (vhost->mq_enabled && vhost->using_channels)
2759		return ibmvfc_cancel_all_mq(sdev, type);
2760	else
2761		return ibmvfc_cancel_all_sq(sdev, type);
2762}
2763
2764/**
2765 * ibmvfc_match_key - Match function for specified cancel key
2766 * @evt:	ibmvfc event struct
2767 * @key:	cancel key to match
2768 *
2769 * Returns:
2770 *	1 if event matches key / 0 if event does not match key
2771 **/
2772static int ibmvfc_match_key(struct ibmvfc_event *evt, void *key)
2773{
2774	unsigned long cancel_key = (unsigned long)key;
2775
2776	if (evt->crq.format == IBMVFC_CMD_FORMAT &&
2777	    be32_to_cpu(evt->iu.cmd.cancel_key) == cancel_key)
2778		return 1;
2779	return 0;
2780}
2781
2782/**
2783 * ibmvfc_match_evt - Match function for specified event
2784 * @evt:	ibmvfc event struct
2785 * @match:	event to match
2786 *
2787 * Returns:
2788 *	1 if event matches key / 0 if event does not match key
2789 **/
2790static int ibmvfc_match_evt(struct ibmvfc_event *evt, void *match)
2791{
2792	if (evt == match)
2793		return 1;
2794	return 0;
2795}
2796
2797/**
2798 * ibmvfc_abort_task_set - Abort outstanding commands to the device
2799 * @sdev:	scsi device to abort commands
2800 *
2801 * This sends an Abort Task Set to the VIOS for the specified device. This does
2802 * NOT send any cancel to the VIOS. That must be done separately.
2803 *
2804 * Returns:
2805 *	0 on success / other on failure
2806 **/
2807static int ibmvfc_abort_task_set(struct scsi_device *sdev)
2808{
2809	struct ibmvfc_host *vhost = shost_priv(sdev->host);
2810	struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2811	struct ibmvfc_cmd *tmf;
2812	struct ibmvfc_event *evt, *found_evt;
2813	union ibmvfc_iu rsp_iu;
2814	struct ibmvfc_fcp_cmd_iu *iu;
2815	struct ibmvfc_fcp_rsp *fc_rsp = ibmvfc_get_fcp_rsp(vhost, &rsp_iu.cmd);
2816	int rc, rsp_rc = -EBUSY;
2817	unsigned long flags, timeout = IBMVFC_ABORT_TIMEOUT;
2818	int rsp_code = 0;
2819
2820	found_evt = NULL;
2821	spin_lock_irqsave(vhost->host->host_lock, flags);
2822	spin_lock(&vhost->crq.l_lock);
2823	list_for_each_entry(evt, &vhost->crq.sent, queue_list) {
2824		if (evt->cmnd && evt->cmnd->device == sdev) {
2825			found_evt = evt;
2826			break;
2827		}
2828	}
2829	spin_unlock(&vhost->crq.l_lock);
2830
2831	if (!found_evt) {
2832		if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2833			sdev_printk(KERN_INFO, sdev, "No events found to abort\n");
2834		spin_unlock_irqrestore(vhost->host->host_lock, flags);
2835		return 0;
2836	}
2837
2838	if (vhost->state == IBMVFC_ACTIVE) {
2839		evt = ibmvfc_get_event(&vhost->crq);
2840		if (!evt) {
2841			spin_unlock_irqrestore(vhost->host->host_lock, flags);
2842			return -ENOMEM;
2843		}
2844		ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
2845		tmf = ibmvfc_init_vfc_cmd(evt, sdev);
2846		iu = ibmvfc_get_fcp_iu(vhost, tmf);
2847
2848		if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN))
2849			tmf->target_wwpn = cpu_to_be64(rport->port_name);
2850		iu->tmf_flags = IBMVFC_ABORT_TASK_SET;
 
 
 
 
 
 
 
2851		tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF));
 
2852		evt->sync_iu = &rsp_iu;
2853
2854		tmf->correlation = cpu_to_be64((u64)evt);
2855
2856		init_completion(&evt->comp);
2857		rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2858	}
2859
2860	spin_unlock_irqrestore(vhost->host->host_lock, flags);
2861
2862	if (rsp_rc != 0) {
2863		sdev_printk(KERN_ERR, sdev, "Failed to send abort. rc=%d\n", rsp_rc);
2864		return -EIO;
2865	}
2866
2867	sdev_printk(KERN_INFO, sdev, "Aborting outstanding commands\n");
2868	timeout = wait_for_completion_timeout(&evt->comp, timeout);
2869
2870	if (!timeout) {
2871		rc = ibmvfc_cancel_all(sdev, 0);
2872		if (!rc) {
2873			rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);
2874			if (rc == SUCCESS)
2875				rc = 0;
2876		}
2877
2878		if (rc) {
2879			sdev_printk(KERN_INFO, sdev, "Cancel failed, resetting host\n");
2880			ibmvfc_reset_host(vhost);
2881			rsp_rc = -EIO;
2882			rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);
2883
2884			if (rc == SUCCESS)
2885				rsp_rc = 0;
2886
2887			rc = ibmvfc_wait_for_ops(vhost, evt, ibmvfc_match_evt);
2888			if (rc != SUCCESS) {
2889				spin_lock_irqsave(vhost->host->host_lock, flags);
2890				ibmvfc_hard_reset_host(vhost);
2891				spin_unlock_irqrestore(vhost->host->host_lock, flags);
2892				rsp_rc = 0;
2893			}
2894
2895			goto out;
2896		}
2897	}
2898
2899	if (rsp_iu.cmd.status)
2900		rsp_code = ibmvfc_get_err_result(vhost, &rsp_iu.cmd);
2901
2902	if (rsp_code) {
2903		if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2904			rsp_code = fc_rsp->data.info.rsp_code;
2905
2906		sdev_printk(KERN_ERR, sdev, "Abort failed: %s (%x:%x) "
2907			    "flags: %x fcp_rsp: %x, scsi_status: %x\n",
2908			    ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)),
2909			    be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error), fc_rsp->flags, rsp_code,
2910			    fc_rsp->scsi_status);
2911		rsp_rc = -EIO;
2912	} else
2913		sdev_printk(KERN_INFO, sdev, "Abort successful\n");
2914
2915out:
2916	spin_lock_irqsave(vhost->host->host_lock, flags);
2917	ibmvfc_free_event(evt);
2918	spin_unlock_irqrestore(vhost->host->host_lock, flags);
2919	return rsp_rc;
2920}
2921
2922/**
2923 * ibmvfc_eh_abort_handler - Abort a command
2924 * @cmd:	scsi command to abort
2925 *
2926 * Returns:
2927 *	SUCCESS / FAST_IO_FAIL / FAILED
2928 **/
2929static int ibmvfc_eh_abort_handler(struct scsi_cmnd *cmd)
2930{
2931	struct scsi_device *sdev = cmd->device;
2932	struct ibmvfc_host *vhost = shost_priv(sdev->host);
2933	int cancel_rc, block_rc;
2934	int rc = FAILED;
2935
2936	ENTER;
2937	block_rc = fc_block_scsi_eh(cmd);
2938	ibmvfc_wait_while_resetting(vhost);
2939	if (block_rc != FAST_IO_FAIL) {
2940		cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET);
2941		ibmvfc_abort_task_set(sdev);
2942	} else
2943		cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2944
2945	if (!cancel_rc)
2946		rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2947
2948	if (block_rc == FAST_IO_FAIL && rc != FAILED)
2949		rc = FAST_IO_FAIL;
2950
2951	LEAVE;
2952	return rc;
2953}
2954
2955/**
2956 * ibmvfc_eh_device_reset_handler - Reset a single LUN
2957 * @cmd:	scsi command struct
2958 *
2959 * Returns:
2960 *	SUCCESS / FAST_IO_FAIL / FAILED
2961 **/
2962static int ibmvfc_eh_device_reset_handler(struct scsi_cmnd *cmd)
2963{
2964	struct scsi_device *sdev = cmd->device;
2965	struct ibmvfc_host *vhost = shost_priv(sdev->host);
2966	int cancel_rc, block_rc, reset_rc = 0;
2967	int rc = FAILED;
2968
2969	ENTER;
2970	block_rc = fc_block_scsi_eh(cmd);
2971	ibmvfc_wait_while_resetting(vhost);
2972	if (block_rc != FAST_IO_FAIL) {
2973		cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_LUN_RESET);
2974		reset_rc = ibmvfc_reset_device(sdev, IBMVFC_LUN_RESET, "LUN");
2975	} else
2976		cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2977
2978	if (!cancel_rc && !reset_rc)
2979		rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2980
2981	if (block_rc == FAST_IO_FAIL && rc != FAILED)
2982		rc = FAST_IO_FAIL;
2983
2984	LEAVE;
2985	return rc;
2986}
2987
2988/**
2989 * ibmvfc_dev_cancel_all_noreset - Device iterated cancel all function
2990 * @sdev:	scsi device struct
2991 * @data:	return code
2992 *
2993 **/
2994static void ibmvfc_dev_cancel_all_noreset(struct scsi_device *sdev, void *data)
2995{
2996	unsigned long *rc = data;
2997	*rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2998}
2999
3000/**
 
 
 
 
 
 
 
 
 
 
 
 
3001 * ibmvfc_eh_target_reset_handler - Reset the target
3002 * @cmd:	scsi command struct
3003 *
3004 * Returns:
3005 *	SUCCESS / FAST_IO_FAIL / FAILED
3006 **/
3007static int ibmvfc_eh_target_reset_handler(struct scsi_cmnd *cmd)
3008{
3009	struct scsi_target *starget = scsi_target(cmd->device);
3010	struct fc_rport *rport = starget_to_rport(starget);
3011	struct Scsi_Host *shost = rport_to_shost(rport);
3012	struct ibmvfc_host *vhost = shost_priv(shost);
3013	int block_rc;
3014	int reset_rc = 0;
3015	int rc = FAILED;
3016	unsigned long cancel_rc = 0;
3017	bool tgt_reset = false;
3018
3019	ENTER;
3020	block_rc = fc_block_rport(rport);
3021	ibmvfc_wait_while_resetting(vhost);
3022	if (block_rc != FAST_IO_FAIL) {
3023		struct scsi_device *sdev;
3024
3025		shost_for_each_device(sdev, shost) {
3026			if ((sdev->channel != starget->channel) ||
3027			    (sdev->id != starget->id))
3028				continue;
3029
3030			cancel_rc |= ibmvfc_cancel_all(sdev,
3031						       IBMVFC_TMF_TGT_RESET);
3032			if (!tgt_reset) {
3033				reset_rc = ibmvfc_reset_device(sdev,
3034					IBMVFC_TARGET_RESET, "target");
3035				tgt_reset = true;
3036			}
3037		}
3038	} else
3039		starget_for_each_device(starget, &cancel_rc,
3040					ibmvfc_dev_cancel_all_noreset);
3041
3042	if (!cancel_rc && !reset_rc)
3043		rc = ibmvfc_wait_for_ops(vhost, starget, ibmvfc_match_target);
3044
3045	if (block_rc == FAST_IO_FAIL && rc != FAILED)
3046		rc = FAST_IO_FAIL;
3047
3048	LEAVE;
3049	return rc;
3050}
3051
3052/**
3053 * ibmvfc_eh_host_reset_handler - Reset the connection to the server
3054 * @cmd:	struct scsi_cmnd having problems
3055 *
3056 **/
3057static int ibmvfc_eh_host_reset_handler(struct scsi_cmnd *cmd)
3058{
3059	int rc;
3060	struct ibmvfc_host *vhost = shost_priv(cmd->device->host);
3061
3062	dev_err(vhost->dev, "Resetting connection due to error recovery\n");
3063	rc = ibmvfc_issue_fc_host_lip(vhost->host);
3064
3065	return rc ? FAILED : SUCCESS;
3066}
3067
3068/**
3069 * ibmvfc_terminate_rport_io - Terminate all pending I/O to the rport.
3070 * @rport:		rport struct
3071 *
3072 * Return value:
3073 * 	none
3074 **/
3075static void ibmvfc_terminate_rport_io(struct fc_rport *rport)
3076{
3077	struct Scsi_Host *shost = rport_to_shost(rport);
3078	struct ibmvfc_host *vhost = shost_priv(shost);
3079	struct fc_rport *dev_rport;
3080	struct scsi_device *sdev;
3081	struct ibmvfc_target *tgt;
3082	unsigned long rc, flags;
3083	unsigned int found;
3084
3085	ENTER;
3086	shost_for_each_device(sdev, shost) {
3087		dev_rport = starget_to_rport(scsi_target(sdev));
3088		if (dev_rport != rport)
3089			continue;
3090		ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
3091	}
3092
3093	rc = ibmvfc_wait_for_ops(vhost, rport, ibmvfc_match_rport);
3094
3095	if (rc == FAILED)
3096		ibmvfc_issue_fc_host_lip(shost);
3097
3098	spin_lock_irqsave(shost->host_lock, flags);
3099	found = 0;
3100	list_for_each_entry(tgt, &vhost->targets, queue) {
3101		if (tgt->scsi_id == rport->port_id) {
3102			found++;
3103			break;
3104		}
3105	}
3106
3107	if (found && tgt->action == IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT) {
3108		/*
3109		 * If we get here, that means we previously attempted to send
3110		 * an implicit logout to the target but it failed, most likely
3111		 * due to I/O being pending, so we need to send it again
3112		 */
3113		ibmvfc_del_tgt(tgt);
3114		ibmvfc_reinit_host(vhost);
3115	}
3116
3117	spin_unlock_irqrestore(shost->host_lock, flags);
3118	LEAVE;
3119}
3120
3121static const struct ibmvfc_async_desc ae_desc [] = {
3122	{ "PLOGI",	IBMVFC_AE_ELS_PLOGI,	IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3123	{ "LOGO",	IBMVFC_AE_ELS_LOGO,	IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3124	{ "PRLO",	IBMVFC_AE_ELS_PRLO,	IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3125	{ "N-Port SCN",	IBMVFC_AE_SCN_NPORT,	IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3126	{ "Group SCN",	IBMVFC_AE_SCN_GROUP,	IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3127	{ "Domain SCN",	IBMVFC_AE_SCN_DOMAIN,	IBMVFC_DEFAULT_LOG_LEVEL },
3128	{ "Fabric SCN",	IBMVFC_AE_SCN_FABRIC,	IBMVFC_DEFAULT_LOG_LEVEL },
3129	{ "Link Up",	IBMVFC_AE_LINK_UP,	IBMVFC_DEFAULT_LOG_LEVEL },
3130	{ "Link Down",	IBMVFC_AE_LINK_DOWN,	IBMVFC_DEFAULT_LOG_LEVEL },
3131	{ "Link Dead",	IBMVFC_AE_LINK_DEAD,	IBMVFC_DEFAULT_LOG_LEVEL },
3132	{ "Halt",	IBMVFC_AE_HALT,		IBMVFC_DEFAULT_LOG_LEVEL },
3133	{ "Resume",	IBMVFC_AE_RESUME,	IBMVFC_DEFAULT_LOG_LEVEL },
3134	{ "Adapter Failed", IBMVFC_AE_ADAPTER_FAILED, IBMVFC_DEFAULT_LOG_LEVEL },
3135};
3136
3137static const struct ibmvfc_async_desc unknown_ae = {
3138	"Unknown async", 0, IBMVFC_DEFAULT_LOG_LEVEL
3139};
3140
3141/**
3142 * ibmvfc_get_ae_desc - Get text description for async event
3143 * @ae:	async event
3144 *
3145 **/
3146static const struct ibmvfc_async_desc *ibmvfc_get_ae_desc(u64 ae)
3147{
3148	int i;
3149
3150	for (i = 0; i < ARRAY_SIZE(ae_desc); i++)
3151		if (ae_desc[i].ae == ae)
3152			return &ae_desc[i];
3153
3154	return &unknown_ae;
3155}
3156
3157static const struct {
3158	enum ibmvfc_ae_link_state state;
3159	const char *desc;
3160} link_desc [] = {
3161	{ IBMVFC_AE_LS_LINK_UP,		" link up" },
3162	{ IBMVFC_AE_LS_LINK_BOUNCED,	" link bounced" },
3163	{ IBMVFC_AE_LS_LINK_DOWN,	" link down" },
3164	{ IBMVFC_AE_LS_LINK_DEAD,	" link dead" },
3165};
3166
3167/**
3168 * ibmvfc_get_link_state - Get text description for link state
3169 * @state:	link state
3170 *
3171 **/
3172static const char *ibmvfc_get_link_state(enum ibmvfc_ae_link_state state)
3173{
3174	int i;
3175
3176	for (i = 0; i < ARRAY_SIZE(link_desc); i++)
3177		if (link_desc[i].state == state)
3178			return link_desc[i].desc;
3179
3180	return "";
3181}
3182
3183/**
3184 * ibmvfc_handle_async - Handle an async event from the adapter
3185 * @crq:	crq to process
3186 * @vhost:	ibmvfc host struct
3187 *
3188 **/
3189static void ibmvfc_handle_async(struct ibmvfc_async_crq *crq,
3190				struct ibmvfc_host *vhost)
3191{
3192	const struct ibmvfc_async_desc *desc = ibmvfc_get_ae_desc(be64_to_cpu(crq->event));
3193	struct ibmvfc_target *tgt;
3194
3195	ibmvfc_log(vhost, desc->log_level, "%s event received. scsi_id: %llx, wwpn: %llx,"
3196		   " node_name: %llx%s\n", desc->desc, be64_to_cpu(crq->scsi_id),
3197		   be64_to_cpu(crq->wwpn), be64_to_cpu(crq->node_name),
3198		   ibmvfc_get_link_state(crq->link_state));
3199
3200	switch (be64_to_cpu(crq->event)) {
3201	case IBMVFC_AE_RESUME:
3202		switch (crq->link_state) {
3203		case IBMVFC_AE_LS_LINK_DOWN:
3204			ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
3205			break;
3206		case IBMVFC_AE_LS_LINK_DEAD:
3207			ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3208			break;
3209		case IBMVFC_AE_LS_LINK_UP:
3210		case IBMVFC_AE_LS_LINK_BOUNCED:
3211		default:
3212			vhost->events_to_log |= IBMVFC_AE_LINKUP;
3213			vhost->delay_init = 1;
3214			__ibmvfc_reset_host(vhost);
3215			break;
3216		}
3217
3218		break;
3219	case IBMVFC_AE_LINK_UP:
3220		vhost->events_to_log |= IBMVFC_AE_LINKUP;
3221		vhost->delay_init = 1;
3222		__ibmvfc_reset_host(vhost);
3223		break;
3224	case IBMVFC_AE_SCN_FABRIC:
3225	case IBMVFC_AE_SCN_DOMAIN:
3226		vhost->events_to_log |= IBMVFC_AE_RSCN;
3227		if (vhost->state < IBMVFC_HALTED) {
3228			vhost->delay_init = 1;
3229			__ibmvfc_reset_host(vhost);
3230		}
3231		break;
3232	case IBMVFC_AE_SCN_NPORT:
3233	case IBMVFC_AE_SCN_GROUP:
3234		vhost->events_to_log |= IBMVFC_AE_RSCN;
3235		ibmvfc_reinit_host(vhost);
3236		break;
3237	case IBMVFC_AE_ELS_LOGO:
3238	case IBMVFC_AE_ELS_PRLO:
3239	case IBMVFC_AE_ELS_PLOGI:
3240		list_for_each_entry(tgt, &vhost->targets, queue) {
3241			if (!crq->scsi_id && !crq->wwpn && !crq->node_name)
3242				break;
3243			if (crq->scsi_id && cpu_to_be64(tgt->scsi_id) != crq->scsi_id)
3244				continue;
3245			if (crq->wwpn && cpu_to_be64(tgt->ids.port_name) != crq->wwpn)
3246				continue;
3247			if (crq->node_name && cpu_to_be64(tgt->ids.node_name) != crq->node_name)
3248				continue;
3249			if (tgt->need_login && be64_to_cpu(crq->event) == IBMVFC_AE_ELS_LOGO)
3250				tgt->logo_rcvd = 1;
3251			if (!tgt->need_login || be64_to_cpu(crq->event) == IBMVFC_AE_ELS_PLOGI) {
3252				ibmvfc_del_tgt(tgt);
3253				ibmvfc_reinit_host(vhost);
3254			}
3255		}
3256		break;
3257	case IBMVFC_AE_LINK_DOWN:
3258	case IBMVFC_AE_ADAPTER_FAILED:
3259		ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
3260		break;
3261	case IBMVFC_AE_LINK_DEAD:
3262		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3263		break;
3264	case IBMVFC_AE_HALT:
3265		ibmvfc_link_down(vhost, IBMVFC_HALTED);
3266		break;
3267	default:
3268		dev_err(vhost->dev, "Unknown async event received: %lld\n", crq->event);
3269		break;
3270	}
3271}
3272
3273/**
3274 * ibmvfc_handle_crq - Handles and frees received events in the CRQ
3275 * @crq:	Command/Response queue
3276 * @vhost:	ibmvfc host struct
3277 * @evt_doneq:	Event done queue
3278 *
3279**/
3280static void ibmvfc_handle_crq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost,
3281			      struct list_head *evt_doneq)
3282{
3283	long rc;
3284	struct ibmvfc_event *evt = (struct ibmvfc_event *)be64_to_cpu(crq->ioba);
3285
3286	switch (crq->valid) {
3287	case IBMVFC_CRQ_INIT_RSP:
3288		switch (crq->format) {
3289		case IBMVFC_CRQ_INIT:
3290			dev_info(vhost->dev, "Partner initialized\n");
3291			/* Send back a response */
3292			rc = ibmvfc_send_crq_init_complete(vhost);
3293			if (rc == 0)
3294				ibmvfc_init_host(vhost);
3295			else
3296				dev_err(vhost->dev, "Unable to send init rsp. rc=%ld\n", rc);
3297			break;
3298		case IBMVFC_CRQ_INIT_COMPLETE:
3299			dev_info(vhost->dev, "Partner initialization complete\n");
3300			ibmvfc_init_host(vhost);
3301			break;
3302		default:
3303			dev_err(vhost->dev, "Unknown crq message type: %d\n", crq->format);
3304		}
3305		return;
3306	case IBMVFC_CRQ_XPORT_EVENT:
3307		vhost->state = IBMVFC_NO_CRQ;
3308		vhost->logged_in = 0;
3309		ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
3310		if (crq->format == IBMVFC_PARTITION_MIGRATED) {
3311			/* We need to re-setup the interpartition connection */
3312			dev_info(vhost->dev, "Partition migrated, Re-enabling adapter\n");
3313			vhost->client_migrated = 1;
3314
3315			scsi_block_requests(vhost->host);
3316			ibmvfc_purge_requests(vhost, DID_REQUEUE);
3317			ibmvfc_set_host_state(vhost, IBMVFC_LINK_DOWN);
3318			ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_REENABLE);
3319			wake_up(&vhost->work_wait_q);
3320		} else if (crq->format == IBMVFC_PARTNER_FAILED || crq->format == IBMVFC_PARTNER_DEREGISTER) {
3321			dev_err(vhost->dev, "Host partner adapter deregistered or failed (rc=%d)\n", crq->format);
3322			ibmvfc_purge_requests(vhost, DID_ERROR);
3323			ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
3324			ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
3325		} else {
3326			dev_err(vhost->dev, "Received unknown transport event from partner (rc=%d)\n", crq->format);
3327		}
3328		return;
3329	case IBMVFC_CRQ_CMD_RSP:
3330		break;
3331	default:
3332		dev_err(vhost->dev, "Got an invalid message type 0x%02x\n", crq->valid);
3333		return;
3334	}
3335
3336	if (crq->format == IBMVFC_ASYNC_EVENT)
3337		return;
3338
3339	/* The only kind of payload CRQs we should get are responses to
3340	 * things we send. Make sure this response is to something we
3341	 * actually sent
3342	 */
3343	if (unlikely(!ibmvfc_valid_event(&vhost->crq.evt_pool, evt))) {
3344		dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n",
3345			crq->ioba);
3346		return;
3347	}
3348
3349	if (unlikely(atomic_dec_if_positive(&evt->active))) {
3350		dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n",
3351			crq->ioba);
3352		return;
3353	}
3354
3355	spin_lock(&evt->queue->l_lock);
3356	list_move_tail(&evt->queue_list, evt_doneq);
3357	spin_unlock(&evt->queue->l_lock);
 
3358}
3359
3360/**
3361 * ibmvfc_scan_finished - Check if the device scan is done.
3362 * @shost:	scsi host struct
3363 * @time:	current elapsed time
3364 *
3365 * Returns:
3366 *	0 if scan is not done / 1 if scan is done
3367 **/
3368static int ibmvfc_scan_finished(struct Scsi_Host *shost, unsigned long time)
3369{
3370	unsigned long flags;
3371	struct ibmvfc_host *vhost = shost_priv(shost);
3372	int done = 0;
3373
3374	spin_lock_irqsave(shost->host_lock, flags);
3375	if (!vhost->scan_timeout)
3376		done = 1;
3377	else if (time >= (vhost->scan_timeout * HZ)) {
3378		dev_info(vhost->dev, "Scan taking longer than %d seconds, "
3379			 "continuing initialization\n", vhost->scan_timeout);
3380		done = 1;
3381	}
3382
3383	if (vhost->scan_complete) {
3384		vhost->scan_timeout = init_timeout;
3385		done = 1;
3386	}
3387	spin_unlock_irqrestore(shost->host_lock, flags);
3388	return done;
3389}
3390
3391/**
3392 * ibmvfc_slave_alloc - Setup the device's task set value
3393 * @sdev:	struct scsi_device device to configure
3394 *
3395 * Set the device's task set value so that error handling works as
3396 * expected.
3397 *
3398 * Returns:
3399 *	0 on success / -ENXIO if device does not exist
3400 **/
3401static int ibmvfc_slave_alloc(struct scsi_device *sdev)
3402{
3403	struct Scsi_Host *shost = sdev->host;
3404	struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
3405	struct ibmvfc_host *vhost = shost_priv(shost);
3406	unsigned long flags = 0;
3407
3408	if (!rport || fc_remote_port_chkready(rport))
3409		return -ENXIO;
3410
3411	spin_lock_irqsave(shost->host_lock, flags);
3412	sdev->hostdata = (void *)(unsigned long)vhost->task_set++;
3413	spin_unlock_irqrestore(shost->host_lock, flags);
3414	return 0;
3415}
3416
3417/**
3418 * ibmvfc_target_alloc - Setup the target's task set value
3419 * @starget:	struct scsi_target
3420 *
3421 * Set the target's task set value so that error handling works as
3422 * expected.
3423 *
3424 * Returns:
3425 *	0 on success / -ENXIO if device does not exist
3426 **/
3427static int ibmvfc_target_alloc(struct scsi_target *starget)
3428{
3429	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
3430	struct ibmvfc_host *vhost = shost_priv(shost);
3431	unsigned long flags = 0;
3432
3433	spin_lock_irqsave(shost->host_lock, flags);
3434	starget->hostdata = (void *)(unsigned long)vhost->task_set++;
3435	spin_unlock_irqrestore(shost->host_lock, flags);
3436	return 0;
3437}
3438
3439/**
3440 * ibmvfc_slave_configure - Configure the device
3441 * @sdev:	struct scsi_device device to configure
3442 *
3443 * Enable allow_restart for a device if it is a disk. Adjust the
3444 * queue_depth here also.
3445 *
3446 * Returns:
3447 *	0
3448 **/
3449static int ibmvfc_slave_configure(struct scsi_device *sdev)
3450{
3451	struct Scsi_Host *shost = sdev->host;
3452	unsigned long flags = 0;
3453
3454	spin_lock_irqsave(shost->host_lock, flags);
3455	if (sdev->type == TYPE_DISK) {
3456		sdev->allow_restart = 1;
3457		blk_queue_rq_timeout(sdev->request_queue, 120 * HZ);
3458	}
3459	spin_unlock_irqrestore(shost->host_lock, flags);
3460	return 0;
3461}
3462
3463/**
3464 * ibmvfc_change_queue_depth - Change the device's queue depth
3465 * @sdev:	scsi device struct
3466 * @qdepth:	depth to set
 
3467 *
3468 * Return value:
3469 * 	actual depth set
3470 **/
3471static int ibmvfc_change_queue_depth(struct scsi_device *sdev, int qdepth)
3472{
3473	if (qdepth > IBMVFC_MAX_CMDS_PER_LUN)
3474		qdepth = IBMVFC_MAX_CMDS_PER_LUN;
3475
3476	return scsi_change_queue_depth(sdev, qdepth);
3477}
3478
3479static ssize_t ibmvfc_show_host_partition_name(struct device *dev,
3480						 struct device_attribute *attr, char *buf)
3481{
3482	struct Scsi_Host *shost = class_to_shost(dev);
3483	struct ibmvfc_host *vhost = shost_priv(shost);
3484
3485	return snprintf(buf, PAGE_SIZE, "%s\n",
3486			vhost->login_buf->resp.partition_name);
3487}
3488
3489static ssize_t ibmvfc_show_host_device_name(struct device *dev,
3490					    struct device_attribute *attr, char *buf)
3491{
3492	struct Scsi_Host *shost = class_to_shost(dev);
3493	struct ibmvfc_host *vhost = shost_priv(shost);
3494
3495	return snprintf(buf, PAGE_SIZE, "%s\n",
3496			vhost->login_buf->resp.device_name);
3497}
3498
3499static ssize_t ibmvfc_show_host_loc_code(struct device *dev,
3500					 struct device_attribute *attr, char *buf)
3501{
3502	struct Scsi_Host *shost = class_to_shost(dev);
3503	struct ibmvfc_host *vhost = shost_priv(shost);
3504
3505	return snprintf(buf, PAGE_SIZE, "%s\n",
3506			vhost->login_buf->resp.port_loc_code);
3507}
3508
3509static ssize_t ibmvfc_show_host_drc_name(struct device *dev,
3510					 struct device_attribute *attr, char *buf)
3511{
3512	struct Scsi_Host *shost = class_to_shost(dev);
3513	struct ibmvfc_host *vhost = shost_priv(shost);
3514
3515	return snprintf(buf, PAGE_SIZE, "%s\n",
3516			vhost->login_buf->resp.drc_name);
3517}
3518
3519static ssize_t ibmvfc_show_host_npiv_version(struct device *dev,
3520					     struct device_attribute *attr, char *buf)
3521{
3522	struct Scsi_Host *shost = class_to_shost(dev);
3523	struct ibmvfc_host *vhost = shost_priv(shost);
3524	return snprintf(buf, PAGE_SIZE, "%d\n", be32_to_cpu(vhost->login_buf->resp.version));
3525}
3526
3527static ssize_t ibmvfc_show_host_capabilities(struct device *dev,
3528					     struct device_attribute *attr, char *buf)
3529{
3530	struct Scsi_Host *shost = class_to_shost(dev);
3531	struct ibmvfc_host *vhost = shost_priv(shost);
3532	return snprintf(buf, PAGE_SIZE, "%llx\n", be64_to_cpu(vhost->login_buf->resp.capabilities));
3533}
3534
3535/**
3536 * ibmvfc_show_log_level - Show the adapter's error logging level
3537 * @dev:	class device struct
3538 * @attr:	unused
3539 * @buf:	buffer
3540 *
3541 * Return value:
3542 * 	number of bytes printed to buffer
3543 **/
3544static ssize_t ibmvfc_show_log_level(struct device *dev,
3545				     struct device_attribute *attr, char *buf)
3546{
3547	struct Scsi_Host *shost = class_to_shost(dev);
3548	struct ibmvfc_host *vhost = shost_priv(shost);
3549	unsigned long flags = 0;
3550	int len;
3551
3552	spin_lock_irqsave(shost->host_lock, flags);
3553	len = snprintf(buf, PAGE_SIZE, "%d\n", vhost->log_level);
3554	spin_unlock_irqrestore(shost->host_lock, flags);
3555	return len;
3556}
3557
3558/**
3559 * ibmvfc_store_log_level - Change the adapter's error logging level
3560 * @dev:	class device struct
3561 * @attr:	unused
3562 * @buf:	buffer
3563 * @count:      buffer size
3564 *
3565 * Return value:
3566 * 	number of bytes printed to buffer
3567 **/
3568static ssize_t ibmvfc_store_log_level(struct device *dev,
3569				      struct device_attribute *attr,
3570				      const char *buf, size_t count)
3571{
3572	struct Scsi_Host *shost = class_to_shost(dev);
3573	struct ibmvfc_host *vhost = shost_priv(shost);
3574	unsigned long flags = 0;
3575
3576	spin_lock_irqsave(shost->host_lock, flags);
3577	vhost->log_level = simple_strtoul(buf, NULL, 10);
3578	spin_unlock_irqrestore(shost->host_lock, flags);
3579	return strlen(buf);
3580}
3581
3582static ssize_t ibmvfc_show_scsi_channels(struct device *dev,
3583					 struct device_attribute *attr, char *buf)
3584{
3585	struct Scsi_Host *shost = class_to_shost(dev);
3586	struct ibmvfc_host *vhost = shost_priv(shost);
3587	struct ibmvfc_channels *scsi = &vhost->scsi_scrqs;
3588	unsigned long flags = 0;
3589	int len;
3590
3591	spin_lock_irqsave(shost->host_lock, flags);
3592	len = snprintf(buf, PAGE_SIZE, "%d\n", scsi->desired_queues);
3593	spin_unlock_irqrestore(shost->host_lock, flags);
3594	return len;
3595}
3596
3597static ssize_t ibmvfc_store_scsi_channels(struct device *dev,
3598					 struct device_attribute *attr,
3599					 const char *buf, size_t count)
3600{
3601	struct Scsi_Host *shost = class_to_shost(dev);
3602	struct ibmvfc_host *vhost = shost_priv(shost);
3603	struct ibmvfc_channels *scsi = &vhost->scsi_scrqs;
3604	unsigned long flags = 0;
3605	unsigned int channels;
3606
3607	spin_lock_irqsave(shost->host_lock, flags);
3608	channels = simple_strtoul(buf, NULL, 10);
3609	scsi->desired_queues = min(channels, shost->nr_hw_queues);
3610	ibmvfc_hard_reset_host(vhost);
3611	spin_unlock_irqrestore(shost->host_lock, flags);
3612	return strlen(buf);
3613}
3614
3615static DEVICE_ATTR(partition_name, S_IRUGO, ibmvfc_show_host_partition_name, NULL);
3616static DEVICE_ATTR(device_name, S_IRUGO, ibmvfc_show_host_device_name, NULL);
3617static DEVICE_ATTR(port_loc_code, S_IRUGO, ibmvfc_show_host_loc_code, NULL);
3618static DEVICE_ATTR(drc_name, S_IRUGO, ibmvfc_show_host_drc_name, NULL);
3619static DEVICE_ATTR(npiv_version, S_IRUGO, ibmvfc_show_host_npiv_version, NULL);
3620static DEVICE_ATTR(capabilities, S_IRUGO, ibmvfc_show_host_capabilities, NULL);
3621static DEVICE_ATTR(log_level, S_IRUGO | S_IWUSR,
3622		   ibmvfc_show_log_level, ibmvfc_store_log_level);
3623static DEVICE_ATTR(nr_scsi_channels, S_IRUGO | S_IWUSR,
3624		   ibmvfc_show_scsi_channels, ibmvfc_store_scsi_channels);
3625
3626#ifdef CONFIG_SCSI_IBMVFC_TRACE
3627/**
3628 * ibmvfc_read_trace - Dump the adapter trace
3629 * @filp:		open sysfs file
3630 * @kobj:		kobject struct
3631 * @bin_attr:	bin_attribute struct
3632 * @buf:		buffer
3633 * @off:		offset
3634 * @count:		buffer size
3635 *
3636 * Return value:
3637 *	number of bytes printed to buffer
3638 **/
3639static ssize_t ibmvfc_read_trace(struct file *filp, struct kobject *kobj,
3640				 struct bin_attribute *bin_attr,
3641				 char *buf, loff_t off, size_t count)
3642{
3643	struct device *dev = kobj_to_dev(kobj);
3644	struct Scsi_Host *shost = class_to_shost(dev);
3645	struct ibmvfc_host *vhost = shost_priv(shost);
3646	unsigned long flags = 0;
3647	int size = IBMVFC_TRACE_SIZE;
3648	char *src = (char *)vhost->trace;
3649
3650	if (off > size)
3651		return 0;
3652	if (off + count > size) {
3653		size -= off;
3654		count = size;
3655	}
3656
3657	spin_lock_irqsave(shost->host_lock, flags);
3658	memcpy(buf, &src[off], count);
3659	spin_unlock_irqrestore(shost->host_lock, flags);
3660	return count;
3661}
3662
3663static struct bin_attribute ibmvfc_trace_attr = {
3664	.attr =	{
3665		.name = "trace",
3666		.mode = S_IRUGO,
3667	},
3668	.size = 0,
3669	.read = ibmvfc_read_trace,
3670};
3671#endif
3672
3673static struct attribute *ibmvfc_host_attrs[] = {
3674	&dev_attr_partition_name.attr,
3675	&dev_attr_device_name.attr,
3676	&dev_attr_port_loc_code.attr,
3677	&dev_attr_drc_name.attr,
3678	&dev_attr_npiv_version.attr,
3679	&dev_attr_capabilities.attr,
3680	&dev_attr_log_level.attr,
3681	&dev_attr_nr_scsi_channels.attr,
3682	NULL
3683};
3684
3685ATTRIBUTE_GROUPS(ibmvfc_host);
3686
3687static const struct scsi_host_template driver_template = {
3688	.module = THIS_MODULE,
3689	.name = "IBM POWER Virtual FC Adapter",
3690	.proc_name = IBMVFC_NAME,
3691	.queuecommand = ibmvfc_queuecommand,
3692	.eh_timed_out = fc_eh_timed_out,
3693	.eh_abort_handler = ibmvfc_eh_abort_handler,
3694	.eh_device_reset_handler = ibmvfc_eh_device_reset_handler,
3695	.eh_target_reset_handler = ibmvfc_eh_target_reset_handler,
3696	.eh_host_reset_handler = ibmvfc_eh_host_reset_handler,
3697	.slave_alloc = ibmvfc_slave_alloc,
3698	.slave_configure = ibmvfc_slave_configure,
3699	.target_alloc = ibmvfc_target_alloc,
3700	.scan_finished = ibmvfc_scan_finished,
3701	.change_queue_depth = ibmvfc_change_queue_depth,
3702	.cmd_per_lun = 16,
3703	.can_queue = IBMVFC_MAX_REQUESTS_DEFAULT,
3704	.this_id = -1,
3705	.sg_tablesize = SG_ALL,
3706	.max_sectors = IBMVFC_MAX_SECTORS,
3707	.shost_groups = ibmvfc_host_groups,
 
3708	.track_queue_depth = 1,
3709};
3710
3711/**
3712 * ibmvfc_next_async_crq - Returns the next entry in async queue
3713 * @vhost:	ibmvfc host struct
3714 *
3715 * Returns:
3716 *	Pointer to next entry in queue / NULL if empty
3717 **/
3718static struct ibmvfc_async_crq *ibmvfc_next_async_crq(struct ibmvfc_host *vhost)
3719{
3720	struct ibmvfc_queue *async_crq = &vhost->async_crq;
3721	struct ibmvfc_async_crq *crq;
3722
3723	crq = &async_crq->msgs.async[async_crq->cur];
3724	if (crq->valid & 0x80) {
3725		if (++async_crq->cur == async_crq->size)
3726			async_crq->cur = 0;
3727		rmb();
3728	} else
3729		crq = NULL;
3730
3731	return crq;
3732}
3733
3734/**
3735 * ibmvfc_next_crq - Returns the next entry in message queue
3736 * @vhost:	ibmvfc host struct
3737 *
3738 * Returns:
3739 *	Pointer to next entry in queue / NULL if empty
3740 **/
3741static struct ibmvfc_crq *ibmvfc_next_crq(struct ibmvfc_host *vhost)
3742{
3743	struct ibmvfc_queue *queue = &vhost->crq;
3744	struct ibmvfc_crq *crq;
3745
3746	crq = &queue->msgs.crq[queue->cur];
3747	if (crq->valid & 0x80) {
3748		if (++queue->cur == queue->size)
3749			queue->cur = 0;
3750		rmb();
3751	} else
3752		crq = NULL;
3753
3754	return crq;
3755}
3756
3757/**
3758 * ibmvfc_interrupt - Interrupt handler
3759 * @irq:		number of irq to handle, not used
3760 * @dev_instance: ibmvfc_host that received interrupt
3761 *
3762 * Returns:
3763 *	IRQ_HANDLED
3764 **/
3765static irqreturn_t ibmvfc_interrupt(int irq, void *dev_instance)
3766{
3767	struct ibmvfc_host *vhost = (struct ibmvfc_host *)dev_instance;
3768	unsigned long flags;
3769
3770	spin_lock_irqsave(vhost->host->host_lock, flags);
3771	vio_disable_interrupts(to_vio_dev(vhost->dev));
3772	tasklet_schedule(&vhost->tasklet);
3773	spin_unlock_irqrestore(vhost->host->host_lock, flags);
3774	return IRQ_HANDLED;
3775}
3776
3777/**
3778 * ibmvfc_tasklet - Interrupt handler tasklet
3779 * @data:		ibmvfc host struct
3780 *
3781 * Returns:
3782 *	Nothing
3783 **/
3784static void ibmvfc_tasklet(void *data)
3785{
3786	struct ibmvfc_host *vhost = data;
3787	struct vio_dev *vdev = to_vio_dev(vhost->dev);
3788	struct ibmvfc_crq *crq;
3789	struct ibmvfc_async_crq *async;
3790	struct ibmvfc_event *evt, *temp;
3791	unsigned long flags;
3792	int done = 0;
3793	LIST_HEAD(evt_doneq);
3794
3795	spin_lock_irqsave(vhost->host->host_lock, flags);
3796	spin_lock(vhost->crq.q_lock);
3797	while (!done) {
3798		/* Pull all the valid messages off the async CRQ */
3799		while ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3800			ibmvfc_handle_async(async, vhost);
3801			async->valid = 0;
3802			wmb();
3803		}
3804
3805		/* Pull all the valid messages off the CRQ */
3806		while ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3807			ibmvfc_handle_crq(crq, vhost, &evt_doneq);
3808			crq->valid = 0;
3809			wmb();
3810		}
3811
3812		vio_enable_interrupts(vdev);
3813		if ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3814			vio_disable_interrupts(vdev);
3815			ibmvfc_handle_async(async, vhost);
3816			async->valid = 0;
3817			wmb();
3818		} else if ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3819			vio_disable_interrupts(vdev);
3820			ibmvfc_handle_crq(crq, vhost, &evt_doneq);
3821			crq->valid = 0;
3822			wmb();
3823		} else
3824			done = 1;
3825	}
3826
3827	spin_unlock(vhost->crq.q_lock);
3828	spin_unlock_irqrestore(vhost->host->host_lock, flags);
3829
3830	list_for_each_entry_safe(evt, temp, &evt_doneq, queue_list) {
3831		del_timer(&evt->timer);
3832		list_del(&evt->queue_list);
3833		ibmvfc_trc_end(evt);
3834		evt->done(evt);
3835	}
3836}
3837
3838static int ibmvfc_toggle_scrq_irq(struct ibmvfc_queue *scrq, int enable)
3839{
3840	struct device *dev = scrq->vhost->dev;
3841	struct vio_dev *vdev = to_vio_dev(dev);
3842	unsigned long rc;
3843	int irq_action = H_ENABLE_VIO_INTERRUPT;
3844
3845	if (!enable)
3846		irq_action = H_DISABLE_VIO_INTERRUPT;
3847
3848	rc = plpar_hcall_norets(H_VIOCTL, vdev->unit_address, irq_action,
3849				scrq->hw_irq, 0, 0);
3850
3851	if (rc)
3852		dev_err(dev, "Couldn't %s sub-crq[%lu] irq. rc=%ld\n",
3853			enable ? "enable" : "disable", scrq->hwq_id, rc);
3854
3855	return rc;
3856}
3857
3858static void ibmvfc_handle_scrq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost,
3859			       struct list_head *evt_doneq)
3860{
3861	struct ibmvfc_event *evt = (struct ibmvfc_event *)be64_to_cpu(crq->ioba);
3862
3863	switch (crq->valid) {
3864	case IBMVFC_CRQ_CMD_RSP:
3865		break;
3866	case IBMVFC_CRQ_XPORT_EVENT:
3867		return;
3868	default:
3869		dev_err(vhost->dev, "Got and invalid message type 0x%02x\n", crq->valid);
3870		return;
3871	}
3872
3873	/* The only kind of payload CRQs we should get are responses to
3874	 * things we send. Make sure this response is to something we
3875	 * actually sent
3876	 */
3877	if (unlikely(!ibmvfc_valid_event(&evt->queue->evt_pool, evt))) {
3878		dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n",
3879			crq->ioba);
3880		return;
3881	}
3882
3883	if (unlikely(atomic_dec_if_positive(&evt->active))) {
3884		dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n",
3885			crq->ioba);
3886		return;
3887	}
3888
3889	spin_lock(&evt->queue->l_lock);
3890	list_move_tail(&evt->queue_list, evt_doneq);
3891	spin_unlock(&evt->queue->l_lock);
3892}
3893
3894static struct ibmvfc_crq *ibmvfc_next_scrq(struct ibmvfc_queue *scrq)
3895{
3896	struct ibmvfc_crq *crq;
3897
3898	crq = &scrq->msgs.scrq[scrq->cur].crq;
3899	if (crq->valid & 0x80) {
3900		if (++scrq->cur == scrq->size)
3901			scrq->cur = 0;
3902		rmb();
3903	} else
3904		crq = NULL;
3905
3906	return crq;
3907}
3908
3909static void ibmvfc_drain_sub_crq(struct ibmvfc_queue *scrq)
3910{
3911	struct ibmvfc_crq *crq;
3912	struct ibmvfc_event *evt, *temp;
3913	unsigned long flags;
3914	int done = 0;
3915	LIST_HEAD(evt_doneq);
3916
3917	spin_lock_irqsave(scrq->q_lock, flags);
3918	while (!done) {
3919		while ((crq = ibmvfc_next_scrq(scrq)) != NULL) {
3920			ibmvfc_handle_scrq(crq, scrq->vhost, &evt_doneq);
3921			crq->valid = 0;
3922			wmb();
3923		}
3924
3925		ibmvfc_toggle_scrq_irq(scrq, 1);
3926		if ((crq = ibmvfc_next_scrq(scrq)) != NULL) {
3927			ibmvfc_toggle_scrq_irq(scrq, 0);
3928			ibmvfc_handle_scrq(crq, scrq->vhost, &evt_doneq);
3929			crq->valid = 0;
3930			wmb();
3931		} else
3932			done = 1;
3933	}
3934	spin_unlock_irqrestore(scrq->q_lock, flags);
3935
3936	list_for_each_entry_safe(evt, temp, &evt_doneq, queue_list) {
3937		del_timer(&evt->timer);
3938		list_del(&evt->queue_list);
3939		ibmvfc_trc_end(evt);
3940		evt->done(evt);
3941	}
3942}
3943
3944static irqreturn_t ibmvfc_interrupt_mq(int irq, void *scrq_instance)
3945{
3946	struct ibmvfc_queue *scrq = (struct ibmvfc_queue *)scrq_instance;
3947
3948	ibmvfc_toggle_scrq_irq(scrq, 0);
3949	ibmvfc_drain_sub_crq(scrq);
3950
3951	return IRQ_HANDLED;
3952}
3953
3954/**
3955 * ibmvfc_init_tgt - Set the next init job step for the target
3956 * @tgt:		ibmvfc target struct
3957 * @job_step:	job step to perform
3958 *
3959 **/
3960static void ibmvfc_init_tgt(struct ibmvfc_target *tgt,
3961			    void (*job_step) (struct ibmvfc_target *))
3962{
3963	if (!ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT))
3964		tgt->job_step = job_step;
3965	wake_up(&tgt->vhost->work_wait_q);
3966}
3967
3968/**
3969 * ibmvfc_retry_tgt_init - Attempt to retry a step in target initialization
3970 * @tgt:		ibmvfc target struct
3971 * @job_step:	initialization job step
3972 *
3973 * Returns: 1 if step will be retried / 0 if not
3974 *
3975 **/
3976static int ibmvfc_retry_tgt_init(struct ibmvfc_target *tgt,
3977				  void (*job_step) (struct ibmvfc_target *))
3978{
3979	if (++tgt->init_retries > IBMVFC_MAX_TGT_INIT_RETRIES) {
3980		ibmvfc_del_tgt(tgt);
3981		wake_up(&tgt->vhost->work_wait_q);
3982		return 0;
3983	} else
3984		ibmvfc_init_tgt(tgt, job_step);
3985	return 1;
3986}
3987
3988/* Defined in FC-LS */
3989static const struct {
3990	int code;
3991	int retry;
3992	int logged_in;
3993} prli_rsp [] = {
3994	{ 0, 1, 0 },
3995	{ 1, 0, 1 },
3996	{ 2, 1, 0 },
3997	{ 3, 1, 0 },
3998	{ 4, 0, 0 },
3999	{ 5, 0, 0 },
4000	{ 6, 0, 1 },
4001	{ 7, 0, 0 },
4002	{ 8, 1, 0 },
4003};
4004
4005/**
4006 * ibmvfc_get_prli_rsp - Find PRLI response index
4007 * @flags:	PRLI response flags
4008 *
4009 **/
4010static int ibmvfc_get_prli_rsp(u16 flags)
4011{
4012	int i;
4013	int code = (flags & 0x0f00) >> 8;
4014
4015	for (i = 0; i < ARRAY_SIZE(prli_rsp); i++)
4016		if (prli_rsp[i].code == code)
4017			return i;
4018
4019	return 0;
4020}
4021
4022/**
4023 * ibmvfc_tgt_prli_done - Completion handler for Process Login
4024 * @evt:	ibmvfc event struct
4025 *
4026 **/
4027static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt)
4028{
4029	struct ibmvfc_target *tgt = evt->tgt;
4030	struct ibmvfc_host *vhost = evt->vhost;
4031	struct ibmvfc_process_login *rsp = &evt->xfer_iu->prli;
4032	struct ibmvfc_prli_svc_parms *parms = &rsp->parms;
4033	u32 status = be16_to_cpu(rsp->common.status);
4034	int index, level = IBMVFC_DEFAULT_LOG_LEVEL;
4035
4036	vhost->discovery_threads--;
4037	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4038	switch (status) {
4039	case IBMVFC_MAD_SUCCESS:
4040		tgt_dbg(tgt, "Process Login succeeded: %X %02X %04X\n",
4041			parms->type, parms->flags, parms->service_parms);
4042
4043		if (parms->type == IBMVFC_SCSI_FCP_TYPE) {
4044			index = ibmvfc_get_prli_rsp(be16_to_cpu(parms->flags));
4045			if (prli_rsp[index].logged_in) {
4046				if (be16_to_cpu(parms->flags) & IBMVFC_PRLI_EST_IMG_PAIR) {
4047					tgt->need_login = 0;
4048					tgt->ids.roles = 0;
4049					if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_TARGET_FUNC)
4050						tgt->ids.roles |= FC_PORT_ROLE_FCP_TARGET;
4051					if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_INITIATOR_FUNC)
4052						tgt->ids.roles |= FC_PORT_ROLE_FCP_INITIATOR;
4053					tgt->add_rport = 1;
4054				} else
4055					ibmvfc_del_tgt(tgt);
4056			} else if (prli_rsp[index].retry)
4057				ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
4058			else
4059				ibmvfc_del_tgt(tgt);
4060		} else
4061			ibmvfc_del_tgt(tgt);
4062		break;
4063	case IBMVFC_MAD_DRIVER_FAILED:
4064		break;
4065	case IBMVFC_MAD_CRQ_ERROR:
4066		ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
4067		break;
4068	case IBMVFC_MAD_FAILED:
4069	default:
4070		if ((be16_to_cpu(rsp->status) & IBMVFC_VIOS_FAILURE) &&
4071		     be16_to_cpu(rsp->error) == IBMVFC_PLOGI_REQUIRED)
4072			level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
4073		else if (tgt->logo_rcvd)
4074			level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
4075		else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
4076			level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
4077		else
4078			ibmvfc_del_tgt(tgt);
4079
4080		tgt_log(tgt, level, "Process Login failed: %s (%x:%x) rc=0x%02X\n",
4081			ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4082			be16_to_cpu(rsp->status), be16_to_cpu(rsp->error), status);
4083		break;
4084	}
4085
4086	kref_put(&tgt->kref, ibmvfc_release_tgt);
4087	ibmvfc_free_event(evt);
4088	wake_up(&vhost->work_wait_q);
4089}
4090
4091/**
4092 * ibmvfc_tgt_send_prli - Send a process login
4093 * @tgt:	ibmvfc target struct
4094 *
4095 **/
4096static void ibmvfc_tgt_send_prli(struct ibmvfc_target *tgt)
4097{
4098	struct ibmvfc_process_login *prli;
4099	struct ibmvfc_host *vhost = tgt->vhost;
4100	struct ibmvfc_event *evt;
4101
4102	if (vhost->discovery_threads >= disc_threads)
4103		return;
4104
4105	kref_get(&tgt->kref);
4106	evt = ibmvfc_get_reserved_event(&vhost->crq);
4107	if (!evt) {
4108		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4109		kref_put(&tgt->kref, ibmvfc_release_tgt);
4110		__ibmvfc_reset_host(vhost);
4111		return;
4112	}
4113	vhost->discovery_threads++;
4114	ibmvfc_init_event(evt, ibmvfc_tgt_prli_done, IBMVFC_MAD_FORMAT);
4115	evt->tgt = tgt;
4116	prli = &evt->iu.prli;
4117	memset(prli, 0, sizeof(*prli));
4118	if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
4119		prli->common.version = cpu_to_be32(2);
4120		prli->target_wwpn = cpu_to_be64(tgt->wwpn);
4121	} else {
4122		prli->common.version = cpu_to_be32(1);
4123	}
4124	prli->common.opcode = cpu_to_be32(IBMVFC_PROCESS_LOGIN);
4125	prli->common.length = cpu_to_be16(sizeof(*prli));
4126	prli->scsi_id = cpu_to_be64(tgt->scsi_id);
4127
4128	prli->parms.type = IBMVFC_SCSI_FCP_TYPE;
4129	prli->parms.flags = cpu_to_be16(IBMVFC_PRLI_EST_IMG_PAIR);
4130	prli->parms.service_parms = cpu_to_be32(IBMVFC_PRLI_INITIATOR_FUNC);
4131	prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_READ_FCP_XFER_RDY_DISABLED);
4132
4133	if (cls3_error)
4134		prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_RETRY);
4135
4136	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4137	if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4138		vhost->discovery_threads--;
4139		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4140		kref_put(&tgt->kref, ibmvfc_release_tgt);
4141	} else
4142		tgt_dbg(tgt, "Sent process login\n");
4143}
4144
4145/**
4146 * ibmvfc_tgt_plogi_done - Completion handler for Port Login
4147 * @evt:	ibmvfc event struct
4148 *
4149 **/
4150static void ibmvfc_tgt_plogi_done(struct ibmvfc_event *evt)
4151{
4152	struct ibmvfc_target *tgt = evt->tgt;
4153	struct ibmvfc_host *vhost = evt->vhost;
4154	struct ibmvfc_port_login *rsp = &evt->xfer_iu->plogi;
4155	u32 status = be16_to_cpu(rsp->common.status);
4156	int level = IBMVFC_DEFAULT_LOG_LEVEL;
4157
4158	vhost->discovery_threads--;
4159	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4160	switch (status) {
4161	case IBMVFC_MAD_SUCCESS:
4162		tgt_dbg(tgt, "Port Login succeeded\n");
4163		if (tgt->ids.port_name &&
4164		    tgt->ids.port_name != wwn_to_u64(rsp->service_parms.port_name)) {
4165			vhost->reinit = 1;
4166			tgt_dbg(tgt, "Port re-init required\n");
4167			break;
4168		}
4169		tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name);
4170		tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name);
4171		tgt->ids.port_id = tgt->scsi_id;
4172		memcpy(&tgt->service_parms, &rsp->service_parms,
4173		       sizeof(tgt->service_parms));
4174		memcpy(&tgt->service_parms_change, &rsp->service_parms_change,
4175		       sizeof(tgt->service_parms_change));
4176		ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli);
4177		break;
4178	case IBMVFC_MAD_DRIVER_FAILED:
4179		break;
4180	case IBMVFC_MAD_CRQ_ERROR:
4181		ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
4182		break;
4183	case IBMVFC_MAD_FAILED:
4184	default:
4185		if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
4186			level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
4187		else
4188			ibmvfc_del_tgt(tgt);
4189
4190		tgt_log(tgt, level, "Port Login failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
4191			ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4192					     be16_to_cpu(rsp->status), be16_to_cpu(rsp->error),
4193			ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)), be16_to_cpu(rsp->fc_type),
4194			ibmvfc_get_ls_explain(be16_to_cpu(rsp->fc_explain)), be16_to_cpu(rsp->fc_explain), status);
4195		break;
4196	}
4197
4198	kref_put(&tgt->kref, ibmvfc_release_tgt);
4199	ibmvfc_free_event(evt);
4200	wake_up(&vhost->work_wait_q);
4201}
4202
4203/**
4204 * ibmvfc_tgt_send_plogi - Send PLOGI to the specified target
4205 * @tgt:	ibmvfc target struct
4206 *
4207 **/
4208static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *tgt)
4209{
4210	struct ibmvfc_port_login *plogi;
4211	struct ibmvfc_host *vhost = tgt->vhost;
4212	struct ibmvfc_event *evt;
4213
4214	if (vhost->discovery_threads >= disc_threads)
4215		return;
4216
4217	kref_get(&tgt->kref);
4218	tgt->logo_rcvd = 0;
4219	evt = ibmvfc_get_reserved_event(&vhost->crq);
4220	if (!evt) {
4221		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4222		kref_put(&tgt->kref, ibmvfc_release_tgt);
4223		__ibmvfc_reset_host(vhost);
4224		return;
4225	}
4226	vhost->discovery_threads++;
4227	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4228	ibmvfc_init_event(evt, ibmvfc_tgt_plogi_done, IBMVFC_MAD_FORMAT);
4229	evt->tgt = tgt;
4230	plogi = &evt->iu.plogi;
4231	memset(plogi, 0, sizeof(*plogi));
4232	if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
4233		plogi->common.version = cpu_to_be32(2);
4234		plogi->target_wwpn = cpu_to_be64(tgt->wwpn);
4235	} else {
4236		plogi->common.version = cpu_to_be32(1);
4237	}
4238	plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN);
4239	plogi->common.length = cpu_to_be16(sizeof(*plogi));
4240	plogi->scsi_id = cpu_to_be64(tgt->scsi_id);
4241
4242	if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4243		vhost->discovery_threads--;
4244		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4245		kref_put(&tgt->kref, ibmvfc_release_tgt);
4246	} else
4247		tgt_dbg(tgt, "Sent port login\n");
4248}
4249
4250/**
4251 * ibmvfc_tgt_implicit_logout_done - Completion handler for Implicit Logout MAD
4252 * @evt:	ibmvfc event struct
4253 *
4254 **/
4255static void ibmvfc_tgt_implicit_logout_done(struct ibmvfc_event *evt)
4256{
4257	struct ibmvfc_target *tgt = evt->tgt;
4258	struct ibmvfc_host *vhost = evt->vhost;
4259	struct ibmvfc_implicit_logout *rsp = &evt->xfer_iu->implicit_logout;
4260	u32 status = be16_to_cpu(rsp->common.status);
4261
4262	vhost->discovery_threads--;
4263	ibmvfc_free_event(evt);
4264	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4265
4266	switch (status) {
4267	case IBMVFC_MAD_SUCCESS:
4268		tgt_dbg(tgt, "Implicit Logout succeeded\n");
4269		break;
4270	case IBMVFC_MAD_DRIVER_FAILED:
4271		kref_put(&tgt->kref, ibmvfc_release_tgt);
4272		wake_up(&vhost->work_wait_q);
4273		return;
4274	case IBMVFC_MAD_FAILED:
4275	default:
4276		tgt_err(tgt, "Implicit Logout failed: rc=0x%02X\n", status);
4277		break;
4278	}
4279
4280	ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_plogi);
 
 
 
 
4281	kref_put(&tgt->kref, ibmvfc_release_tgt);
4282	wake_up(&vhost->work_wait_q);
4283}
4284
4285/**
4286 * __ibmvfc_tgt_get_implicit_logout_evt - Allocate and init an event for implicit logout
4287 * @tgt:		ibmvfc target struct
4288 * @done:		Routine to call when the event is responded to
4289 *
4290 * Returns:
4291 *	Allocated and initialized ibmvfc_event struct
4292 **/
4293static struct ibmvfc_event *__ibmvfc_tgt_get_implicit_logout_evt(struct ibmvfc_target *tgt,
4294								 void (*done) (struct ibmvfc_event *))
4295{
4296	struct ibmvfc_implicit_logout *mad;
4297	struct ibmvfc_host *vhost = tgt->vhost;
4298	struct ibmvfc_event *evt;
4299
 
 
 
4300	kref_get(&tgt->kref);
4301	evt = ibmvfc_get_reserved_event(&vhost->crq);
4302	if (!evt)
4303		return NULL;
4304	ibmvfc_init_event(evt, done, IBMVFC_MAD_FORMAT);
4305	evt->tgt = tgt;
4306	mad = &evt->iu.implicit_logout;
4307	memset(mad, 0, sizeof(*mad));
4308	mad->common.version = cpu_to_be32(1);
4309	mad->common.opcode = cpu_to_be32(IBMVFC_IMPLICIT_LOGOUT);
4310	mad->common.length = cpu_to_be16(sizeof(*mad));
4311	mad->old_scsi_id = cpu_to_be64(tgt->scsi_id);
4312	return evt;
4313}
4314
4315/**
4316 * ibmvfc_tgt_implicit_logout - Initiate an Implicit Logout for specified target
4317 * @tgt:		ibmvfc target struct
4318 *
4319 **/
4320static void ibmvfc_tgt_implicit_logout(struct ibmvfc_target *tgt)
4321{
4322	struct ibmvfc_host *vhost = tgt->vhost;
4323	struct ibmvfc_event *evt;
4324
4325	if (vhost->discovery_threads >= disc_threads)
4326		return;
4327
4328	vhost->discovery_threads++;
4329	evt = __ibmvfc_tgt_get_implicit_logout_evt(tgt,
4330						   ibmvfc_tgt_implicit_logout_done);
4331	if (!evt) {
4332		vhost->discovery_threads--;
4333		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4334		kref_put(&tgt->kref, ibmvfc_release_tgt);
4335		__ibmvfc_reset_host(vhost);
4336		return;
4337	}
4338
4339	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4340	if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4341		vhost->discovery_threads--;
4342		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4343		kref_put(&tgt->kref, ibmvfc_release_tgt);
4344	} else
4345		tgt_dbg(tgt, "Sent Implicit Logout\n");
4346}
4347
4348/**
4349 * ibmvfc_tgt_implicit_logout_and_del_done - Completion handler for Implicit Logout MAD
4350 * @evt:	ibmvfc event struct
4351 *
4352 **/
4353static void ibmvfc_tgt_implicit_logout_and_del_done(struct ibmvfc_event *evt)
4354{
4355	struct ibmvfc_target *tgt = evt->tgt;
4356	struct ibmvfc_host *vhost = evt->vhost;
4357	struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru;
4358	u32 status = be16_to_cpu(mad->common.status);
4359
4360	vhost->discovery_threads--;
4361	ibmvfc_free_event(evt);
4362
4363	/*
4364	 * If our state is IBMVFC_HOST_OFFLINE, we could be unloading the
4365	 * driver in which case we need to free up all the targets. If we are
4366	 * not unloading, we will still go through a hard reset to get out of
4367	 * offline state, so there is no need to track the old targets in that
4368	 * case.
4369	 */
4370	if (status == IBMVFC_MAD_SUCCESS || vhost->state == IBMVFC_HOST_OFFLINE)
4371		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
4372	else
4373		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT);
4374
4375	tgt_dbg(tgt, "Implicit Logout %s\n", (status == IBMVFC_MAD_SUCCESS) ? "succeeded" : "failed");
4376	kref_put(&tgt->kref, ibmvfc_release_tgt);
4377	wake_up(&vhost->work_wait_q);
4378}
4379
4380/**
4381 * ibmvfc_tgt_implicit_logout_and_del - Initiate an Implicit Logout for specified target
4382 * @tgt:		ibmvfc target struct
4383 *
4384 **/
4385static void ibmvfc_tgt_implicit_logout_and_del(struct ibmvfc_target *tgt)
4386{
4387	struct ibmvfc_host *vhost = tgt->vhost;
4388	struct ibmvfc_event *evt;
4389
4390	if (!vhost->logged_in) {
4391		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
4392		return;
4393	}
4394
4395	if (vhost->discovery_threads >= disc_threads)
4396		return;
4397
4398	vhost->discovery_threads++;
4399	evt = __ibmvfc_tgt_get_implicit_logout_evt(tgt,
4400						   ibmvfc_tgt_implicit_logout_and_del_done);
4401
4402	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT);
4403	if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4404		vhost->discovery_threads--;
4405		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
4406		kref_put(&tgt->kref, ibmvfc_release_tgt);
4407	} else
4408		tgt_dbg(tgt, "Sent Implicit Logout\n");
4409}
4410
4411/**
4412 * ibmvfc_tgt_move_login_done - Completion handler for Move Login
4413 * @evt:	ibmvfc event struct
4414 *
4415 **/
4416static void ibmvfc_tgt_move_login_done(struct ibmvfc_event *evt)
4417{
4418	struct ibmvfc_target *tgt = evt->tgt;
4419	struct ibmvfc_host *vhost = evt->vhost;
4420	struct ibmvfc_move_login *rsp = &evt->xfer_iu->move_login;
4421	u32 status = be16_to_cpu(rsp->common.status);
4422	int level = IBMVFC_DEFAULT_LOG_LEVEL;
4423
4424	vhost->discovery_threads--;
4425	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4426	switch (status) {
4427	case IBMVFC_MAD_SUCCESS:
4428		tgt_dbg(tgt, "Move Login succeeded for new scsi_id: %llX\n", tgt->new_scsi_id);
4429		tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name);
4430		tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name);
4431		tgt->scsi_id = tgt->new_scsi_id;
4432		tgt->ids.port_id = tgt->scsi_id;
4433		memcpy(&tgt->service_parms, &rsp->service_parms,
4434		       sizeof(tgt->service_parms));
4435		memcpy(&tgt->service_parms_change, &rsp->service_parms_change,
4436		       sizeof(tgt->service_parms_change));
4437		ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli);
4438		break;
4439	case IBMVFC_MAD_DRIVER_FAILED:
4440		break;
4441	case IBMVFC_MAD_CRQ_ERROR:
4442		ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_move_login);
4443		break;
4444	case IBMVFC_MAD_FAILED:
4445	default:
4446		level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_move_login);
4447
4448		tgt_log(tgt, level,
4449			"Move Login failed: new scsi_id: %llX, flags:%x, vios_flags:%x, rc=0x%02X\n",
4450			tgt->new_scsi_id, be32_to_cpu(rsp->flags), be16_to_cpu(rsp->vios_flags),
4451			status);
4452		break;
4453	}
4454
4455	kref_put(&tgt->kref, ibmvfc_release_tgt);
4456	ibmvfc_free_event(evt);
4457	wake_up(&vhost->work_wait_q);
4458}
4459
4460
4461/**
4462 * ibmvfc_tgt_move_login - Initiate a move login for specified target
4463 * @tgt:		ibmvfc target struct
4464 *
4465 **/
4466static void ibmvfc_tgt_move_login(struct ibmvfc_target *tgt)
4467{
4468	struct ibmvfc_host *vhost = tgt->vhost;
4469	struct ibmvfc_move_login *move;
4470	struct ibmvfc_event *evt;
4471
4472	if (vhost->discovery_threads >= disc_threads)
4473		return;
4474
4475	kref_get(&tgt->kref);
4476	evt = ibmvfc_get_reserved_event(&vhost->crq);
4477	if (!evt) {
4478		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
4479		kref_put(&tgt->kref, ibmvfc_release_tgt);
4480		__ibmvfc_reset_host(vhost);
4481		return;
4482	}
4483	vhost->discovery_threads++;
4484	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4485	ibmvfc_init_event(evt, ibmvfc_tgt_move_login_done, IBMVFC_MAD_FORMAT);
4486	evt->tgt = tgt;
4487	move = &evt->iu.move_login;
4488	memset(move, 0, sizeof(*move));
4489	move->common.version = cpu_to_be32(1);
4490	move->common.opcode = cpu_to_be32(IBMVFC_MOVE_LOGIN);
4491	move->common.length = cpu_to_be16(sizeof(*move));
4492
4493	move->old_scsi_id = cpu_to_be64(tgt->scsi_id);
4494	move->new_scsi_id = cpu_to_be64(tgt->new_scsi_id);
4495	move->wwpn = cpu_to_be64(tgt->wwpn);
4496	move->node_name = cpu_to_be64(tgt->ids.node_name);
4497
4498	if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4499		vhost->discovery_threads--;
4500		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
4501		kref_put(&tgt->kref, ibmvfc_release_tgt);
4502	} else
4503		tgt_dbg(tgt, "Sent Move Login for new scsi_id: %llX\n", tgt->new_scsi_id);
4504}
4505
4506/**
4507 * ibmvfc_adisc_needs_plogi - Does device need PLOGI?
4508 * @mad:	ibmvfc passthru mad struct
4509 * @tgt:	ibmvfc target struct
4510 *
4511 * Returns:
4512 *	1 if PLOGI needed / 0 if PLOGI not needed
4513 **/
4514static int ibmvfc_adisc_needs_plogi(struct ibmvfc_passthru_mad *mad,
4515				    struct ibmvfc_target *tgt)
4516{
4517	if (wwn_to_u64((u8 *)&mad->fc_iu.response[2]) != tgt->ids.port_name)
4518		return 1;
4519	if (wwn_to_u64((u8 *)&mad->fc_iu.response[4]) != tgt->ids.node_name)
4520		return 1;
4521	if (be32_to_cpu(mad->fc_iu.response[6]) != tgt->scsi_id)
4522		return 1;
4523	return 0;
4524}
4525
4526/**
4527 * ibmvfc_tgt_adisc_done - Completion handler for ADISC
4528 * @evt:	ibmvfc event struct
4529 *
4530 **/
4531static void ibmvfc_tgt_adisc_done(struct ibmvfc_event *evt)
4532{
4533	struct ibmvfc_target *tgt = evt->tgt;
4534	struct ibmvfc_host *vhost = evt->vhost;
4535	struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru;
4536	u32 status = be16_to_cpu(mad->common.status);
4537	u8 fc_reason, fc_explain;
4538
4539	vhost->discovery_threads--;
4540	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4541	del_timer(&tgt->timer);
4542
4543	switch (status) {
4544	case IBMVFC_MAD_SUCCESS:
4545		tgt_dbg(tgt, "ADISC succeeded\n");
4546		if (ibmvfc_adisc_needs_plogi(mad, tgt))
4547			ibmvfc_del_tgt(tgt);
4548		break;
4549	case IBMVFC_MAD_DRIVER_FAILED:
4550		break;
4551	case IBMVFC_MAD_FAILED:
4552	default:
4553		ibmvfc_del_tgt(tgt);
4554		fc_reason = (be32_to_cpu(mad->fc_iu.response[1]) & 0x00ff0000) >> 16;
4555		fc_explain = (be32_to_cpu(mad->fc_iu.response[1]) & 0x0000ff00) >> 8;
4556		tgt_info(tgt, "ADISC failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
4557			 ibmvfc_get_cmd_error(be16_to_cpu(mad->iu.status), be16_to_cpu(mad->iu.error)),
4558			 be16_to_cpu(mad->iu.status), be16_to_cpu(mad->iu.error),
4559			 ibmvfc_get_fc_type(fc_reason), fc_reason,
4560			 ibmvfc_get_ls_explain(fc_explain), fc_explain, status);
4561		break;
4562	}
4563
4564	kref_put(&tgt->kref, ibmvfc_release_tgt);
4565	ibmvfc_free_event(evt);
4566	wake_up(&vhost->work_wait_q);
4567}
4568
4569/**
4570 * ibmvfc_init_passthru - Initialize an event struct for FC passthru
4571 * @evt:		ibmvfc event struct
4572 *
4573 **/
4574static void ibmvfc_init_passthru(struct ibmvfc_event *evt)
4575{
4576	struct ibmvfc_passthru_mad *mad = &evt->iu.passthru;
4577
4578	memset(mad, 0, sizeof(*mad));
4579	mad->common.version = cpu_to_be32(1);
4580	mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU);
4581	mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu));
4582	mad->cmd_ioba.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
4583		offsetof(struct ibmvfc_passthru_mad, iu));
4584	mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu));
4585	mad->iu.cmd_len = cpu_to_be32(sizeof(mad->fc_iu.payload));
4586	mad->iu.rsp_len = cpu_to_be32(sizeof(mad->fc_iu.response));
4587	mad->iu.cmd.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
4588		offsetof(struct ibmvfc_passthru_mad, fc_iu) +
4589		offsetof(struct ibmvfc_passthru_fc_iu, payload));
4590	mad->iu.cmd.len = cpu_to_be32(sizeof(mad->fc_iu.payload));
4591	mad->iu.rsp.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
4592		offsetof(struct ibmvfc_passthru_mad, fc_iu) +
4593		offsetof(struct ibmvfc_passthru_fc_iu, response));
4594	mad->iu.rsp.len = cpu_to_be32(sizeof(mad->fc_iu.response));
4595}
4596
4597/**
4598 * ibmvfc_tgt_adisc_cancel_done - Completion handler when cancelling an ADISC
4599 * @evt:		ibmvfc event struct
4600 *
4601 * Just cleanup this event struct. Everything else is handled by
4602 * the ADISC completion handler. If the ADISC never actually comes
4603 * back, we still have the timer running on the ADISC event struct
4604 * which will fire and cause the CRQ to get reset.
4605 *
4606 **/
4607static void ibmvfc_tgt_adisc_cancel_done(struct ibmvfc_event *evt)
4608{
4609	struct ibmvfc_host *vhost = evt->vhost;
4610	struct ibmvfc_target *tgt = evt->tgt;
4611
4612	tgt_dbg(tgt, "ADISC cancel complete\n");
4613	vhost->abort_threads--;
4614	ibmvfc_free_event(evt);
4615	kref_put(&tgt->kref, ibmvfc_release_tgt);
4616	wake_up(&vhost->work_wait_q);
4617}
4618
4619/**
4620 * ibmvfc_adisc_timeout - Handle an ADISC timeout
4621 * @t:		ibmvfc target struct
4622 *
4623 * If an ADISC times out, send a cancel. If the cancel times
4624 * out, reset the CRQ. When the ADISC comes back as cancelled,
4625 * log back into the target.
4626 **/
4627static void ibmvfc_adisc_timeout(struct timer_list *t)
4628{
4629	struct ibmvfc_target *tgt = from_timer(tgt, t, timer);
4630	struct ibmvfc_host *vhost = tgt->vhost;
4631	struct ibmvfc_event *evt;
4632	struct ibmvfc_tmf *tmf;
4633	unsigned long flags;
4634	int rc;
4635
4636	tgt_dbg(tgt, "ADISC timeout\n");
4637	spin_lock_irqsave(vhost->host->host_lock, flags);
4638	if (vhost->abort_threads >= disc_threads ||
4639	    tgt->action != IBMVFC_TGT_ACTION_INIT_WAIT ||
4640	    vhost->state != IBMVFC_INITIALIZING ||
4641	    vhost->action != IBMVFC_HOST_ACTION_QUERY_TGTS) {
4642		spin_unlock_irqrestore(vhost->host->host_lock, flags);
4643		return;
4644	}
4645
4646	vhost->abort_threads++;
4647	kref_get(&tgt->kref);
4648	evt = ibmvfc_get_reserved_event(&vhost->crq);
4649	if (!evt) {
4650		tgt_err(tgt, "Failed to get cancel event for ADISC.\n");
4651		vhost->abort_threads--;
4652		kref_put(&tgt->kref, ibmvfc_release_tgt);
4653		__ibmvfc_reset_host(vhost);
4654		spin_unlock_irqrestore(vhost->host->host_lock, flags);
4655		return;
4656	}
4657	ibmvfc_init_event(evt, ibmvfc_tgt_adisc_cancel_done, IBMVFC_MAD_FORMAT);
4658
4659	evt->tgt = tgt;
4660	tmf = &evt->iu.tmf;
4661	memset(tmf, 0, sizeof(*tmf));
4662	if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
4663		tmf->common.version = cpu_to_be32(2);
4664		tmf->target_wwpn = cpu_to_be64(tgt->wwpn);
4665	} else {
4666		tmf->common.version = cpu_to_be32(1);
4667	}
4668	tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
4669	tmf->common.length = cpu_to_be16(sizeof(*tmf));
4670	tmf->scsi_id = cpu_to_be64(tgt->scsi_id);
4671	tmf->cancel_key = cpu_to_be32(tgt->cancel_key);
4672
4673	rc = ibmvfc_send_event(evt, vhost, default_timeout);
4674
4675	if (rc) {
4676		tgt_err(tgt, "Failed to send cancel event for ADISC. rc=%d\n", rc);
4677		vhost->abort_threads--;
4678		kref_put(&tgt->kref, ibmvfc_release_tgt);
4679		__ibmvfc_reset_host(vhost);
4680	} else
4681		tgt_dbg(tgt, "Attempting to cancel ADISC\n");
4682	spin_unlock_irqrestore(vhost->host->host_lock, flags);
4683}
4684
4685/**
4686 * ibmvfc_tgt_adisc - Initiate an ADISC for specified target
4687 * @tgt:		ibmvfc target struct
4688 *
4689 * When sending an ADISC we end up with two timers running. The
4690 * first timer is the timer in the ibmvfc target struct. If this
4691 * fires, we send a cancel to the target. The second timer is the
4692 * timer on the ibmvfc event for the ADISC, which is longer. If that
4693 * fires, it means the ADISC timed out and our attempt to cancel it
4694 * also failed, so we need to reset the CRQ.
4695 **/
4696static void ibmvfc_tgt_adisc(struct ibmvfc_target *tgt)
4697{
4698	struct ibmvfc_passthru_mad *mad;
4699	struct ibmvfc_host *vhost = tgt->vhost;
4700	struct ibmvfc_event *evt;
4701
4702	if (vhost->discovery_threads >= disc_threads)
4703		return;
4704
4705	kref_get(&tgt->kref);
4706	evt = ibmvfc_get_reserved_event(&vhost->crq);
4707	if (!evt) {
4708		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4709		kref_put(&tgt->kref, ibmvfc_release_tgt);
4710		__ibmvfc_reset_host(vhost);
4711		return;
4712	}
4713	vhost->discovery_threads++;
4714	ibmvfc_init_event(evt, ibmvfc_tgt_adisc_done, IBMVFC_MAD_FORMAT);
4715	evt->tgt = tgt;
4716
4717	ibmvfc_init_passthru(evt);
4718	mad = &evt->iu.passthru;
4719	mad->iu.flags = cpu_to_be32(IBMVFC_FC_ELS);
4720	mad->iu.scsi_id = cpu_to_be64(tgt->scsi_id);
4721	mad->iu.cancel_key = cpu_to_be32(tgt->cancel_key);
4722
4723	mad->fc_iu.payload[0] = cpu_to_be32(IBMVFC_ADISC);
4724	memcpy(&mad->fc_iu.payload[2], &vhost->login_buf->resp.port_name,
4725	       sizeof(vhost->login_buf->resp.port_name));
4726	memcpy(&mad->fc_iu.payload[4], &vhost->login_buf->resp.node_name,
4727	       sizeof(vhost->login_buf->resp.node_name));
4728	mad->fc_iu.payload[6] = cpu_to_be32(be64_to_cpu(vhost->login_buf->resp.scsi_id) & 0x00ffffff);
4729
4730	if (timer_pending(&tgt->timer))
4731		mod_timer(&tgt->timer, jiffies + (IBMVFC_ADISC_TIMEOUT * HZ));
4732	else {
4733		tgt->timer.expires = jiffies + (IBMVFC_ADISC_TIMEOUT * HZ);
4734		add_timer(&tgt->timer);
4735	}
4736
4737	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4738	if (ibmvfc_send_event(evt, vhost, IBMVFC_ADISC_PLUS_CANCEL_TIMEOUT)) {
4739		vhost->discovery_threads--;
4740		del_timer(&tgt->timer);
4741		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4742		kref_put(&tgt->kref, ibmvfc_release_tgt);
4743	} else
4744		tgt_dbg(tgt, "Sent ADISC\n");
4745}
4746
4747/**
4748 * ibmvfc_tgt_query_target_done - Completion handler for Query Target MAD
4749 * @evt:	ibmvfc event struct
4750 *
4751 **/
4752static void ibmvfc_tgt_query_target_done(struct ibmvfc_event *evt)
4753{
4754	struct ibmvfc_target *tgt = evt->tgt;
4755	struct ibmvfc_host *vhost = evt->vhost;
4756	struct ibmvfc_query_tgt *rsp = &evt->xfer_iu->query_tgt;
4757	u32 status = be16_to_cpu(rsp->common.status);
4758	int level = IBMVFC_DEFAULT_LOG_LEVEL;
4759
4760	vhost->discovery_threads--;
4761	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4762	switch (status) {
4763	case IBMVFC_MAD_SUCCESS:
4764		tgt_dbg(tgt, "Query Target succeeded\n");
 
4765		if (be64_to_cpu(rsp->scsi_id) != tgt->scsi_id)
4766			ibmvfc_del_tgt(tgt);
4767		else
4768			ibmvfc_init_tgt(tgt, ibmvfc_tgt_adisc);
4769		break;
4770	case IBMVFC_MAD_DRIVER_FAILED:
4771		break;
4772	case IBMVFC_MAD_CRQ_ERROR:
4773		ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
4774		break;
4775	case IBMVFC_MAD_FAILED:
4776	default:
4777		if ((be16_to_cpu(rsp->status) & IBMVFC_FABRIC_MAPPED) == IBMVFC_FABRIC_MAPPED &&
4778		    be16_to_cpu(rsp->error) == IBMVFC_UNABLE_TO_PERFORM_REQ &&
4779		    be16_to_cpu(rsp->fc_explain) == IBMVFC_PORT_NAME_NOT_REG)
4780			ibmvfc_del_tgt(tgt);
4781		else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
4782			level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
4783		else
4784			ibmvfc_del_tgt(tgt);
4785
4786		tgt_log(tgt, level, "Query Target failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
4787			ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4788			be16_to_cpu(rsp->status), be16_to_cpu(rsp->error),
4789			ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)), be16_to_cpu(rsp->fc_type),
4790			ibmvfc_get_gs_explain(be16_to_cpu(rsp->fc_explain)), be16_to_cpu(rsp->fc_explain),
4791			status);
4792		break;
4793	}
4794
4795	kref_put(&tgt->kref, ibmvfc_release_tgt);
4796	ibmvfc_free_event(evt);
4797	wake_up(&vhost->work_wait_q);
4798}
4799
4800/**
4801 * ibmvfc_tgt_query_target - Initiate a Query Target for specified target
4802 * @tgt:	ibmvfc target struct
4803 *
4804 **/
4805static void ibmvfc_tgt_query_target(struct ibmvfc_target *tgt)
4806{
4807	struct ibmvfc_query_tgt *query_tgt;
4808	struct ibmvfc_host *vhost = tgt->vhost;
4809	struct ibmvfc_event *evt;
4810
4811	if (vhost->discovery_threads >= disc_threads)
4812		return;
4813
4814	kref_get(&tgt->kref);
4815	evt = ibmvfc_get_reserved_event(&vhost->crq);
4816	if (!evt) {
4817		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4818		kref_put(&tgt->kref, ibmvfc_release_tgt);
4819		__ibmvfc_reset_host(vhost);
4820		return;
4821	}
4822	vhost->discovery_threads++;
4823	evt->tgt = tgt;
4824	ibmvfc_init_event(evt, ibmvfc_tgt_query_target_done, IBMVFC_MAD_FORMAT);
4825	query_tgt = &evt->iu.query_tgt;
4826	memset(query_tgt, 0, sizeof(*query_tgt));
4827	query_tgt->common.version = cpu_to_be32(1);
4828	query_tgt->common.opcode = cpu_to_be32(IBMVFC_QUERY_TARGET);
4829	query_tgt->common.length = cpu_to_be16(sizeof(*query_tgt));
4830	query_tgt->wwpn = cpu_to_be64(tgt->ids.port_name);
4831
4832	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4833	if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4834		vhost->discovery_threads--;
4835		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4836		kref_put(&tgt->kref, ibmvfc_release_tgt);
4837	} else
4838		tgt_dbg(tgt, "Sent Query Target\n");
4839}
4840
4841/**
4842 * ibmvfc_alloc_target - Allocate and initialize an ibmvfc target
4843 * @vhost:		ibmvfc host struct
4844 * @target:		Holds SCSI ID to allocate target forand the WWPN
4845 *
4846 * Returns:
4847 *	0 on success / other on failure
4848 **/
4849static int ibmvfc_alloc_target(struct ibmvfc_host *vhost,
4850			       struct ibmvfc_discover_targets_entry *target)
4851{
4852	struct ibmvfc_target *stgt = NULL;
4853	struct ibmvfc_target *wtgt = NULL;
4854	struct ibmvfc_target *tgt;
4855	unsigned long flags;
4856	u64 scsi_id = be32_to_cpu(target->scsi_id) & IBMVFC_DISC_TGT_SCSI_ID_MASK;
4857	u64 wwpn = be64_to_cpu(target->wwpn);
4858
4859	/* Look to see if we already have a target allocated for this SCSI ID or WWPN */
4860	spin_lock_irqsave(vhost->host->host_lock, flags);
4861	list_for_each_entry(tgt, &vhost->targets, queue) {
4862		if (tgt->wwpn == wwpn) {
4863			wtgt = tgt;
4864			break;
4865		}
4866	}
4867
4868	list_for_each_entry(tgt, &vhost->targets, queue) {
4869		if (tgt->scsi_id == scsi_id) {
4870			stgt = tgt;
4871			break;
4872		}
4873	}
4874
4875	if (wtgt && !stgt) {
4876		/*
4877		 * A WWPN target has moved and we still are tracking the old
4878		 * SCSI ID.  The only way we should be able to get here is if
4879		 * we attempted to send an implicit logout for the old SCSI ID
4880		 * and it failed for some reason, such as there being I/O
4881		 * pending to the target. In this case, we will have already
4882		 * deleted the rport from the FC transport so we do a move
4883		 * login, which works even with I/O pending, however, if
4884		 * there is still I/O pending, it will stay outstanding, so
4885		 * we only do this if fast fail is disabled for the rport,
4886		 * otherwise we let terminate_rport_io clean up the port
4887		 * before we login at the new location.
4888		 */
4889		if (wtgt->action == IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT) {
4890			if (wtgt->move_login) {
4891				/*
4892				 * Do a move login here. The old target is no longer
4893				 * known to the transport layer We don't use the
4894				 * normal ibmvfc_set_tgt_action to set this, as we
4895				 * don't normally want to allow this state change.
4896				 */
4897				wtgt->new_scsi_id = scsi_id;
4898				wtgt->action = IBMVFC_TGT_ACTION_INIT;
4899				wtgt->init_retries = 0;
4900				ibmvfc_init_tgt(wtgt, ibmvfc_tgt_move_login);
4901			}
4902			goto unlock_out;
4903		} else {
4904			tgt_err(wtgt, "Unexpected target state: %d, %p\n",
4905				wtgt->action, wtgt->rport);
4906		}
4907	} else if (stgt) {
4908		if (tgt->need_login)
4909			ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
4910		goto unlock_out;
4911	}
4912	spin_unlock_irqrestore(vhost->host->host_lock, flags);
4913
4914	tgt = mempool_alloc(vhost->tgt_pool, GFP_NOIO);
4915	memset(tgt, 0, sizeof(*tgt));
4916	tgt->scsi_id = scsi_id;
4917	tgt->wwpn = wwpn;
4918	tgt->vhost = vhost;
4919	tgt->need_login = 1;
 
4920	timer_setup(&tgt->timer, ibmvfc_adisc_timeout, 0);
4921	kref_init(&tgt->kref);
4922	ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
4923	spin_lock_irqsave(vhost->host->host_lock, flags);
4924	tgt->cancel_key = vhost->task_set++;
4925	list_add_tail(&tgt->queue, &vhost->targets);
4926
4927unlock_out:
4928	spin_unlock_irqrestore(vhost->host->host_lock, flags);
4929	return 0;
4930}
4931
4932/**
4933 * ibmvfc_alloc_targets - Allocate and initialize ibmvfc targets
4934 * @vhost:		ibmvfc host struct
4935 *
4936 * Returns:
4937 *	0 on success / other on failure
4938 **/
4939static int ibmvfc_alloc_targets(struct ibmvfc_host *vhost)
4940{
4941	int i, rc;
4942
4943	for (i = 0, rc = 0; !rc && i < vhost->num_targets; i++)
4944		rc = ibmvfc_alloc_target(vhost, &vhost->scsi_scrqs.disc_buf[i]);
 
 
4945
4946	return rc;
4947}
4948
4949/**
4950 * ibmvfc_discover_targets_done - Completion handler for discover targets MAD
4951 * @evt:	ibmvfc event struct
4952 *
4953 **/
4954static void ibmvfc_discover_targets_done(struct ibmvfc_event *evt)
4955{
4956	struct ibmvfc_host *vhost = evt->vhost;
4957	struct ibmvfc_discover_targets *rsp = &evt->xfer_iu->discover_targets;
4958	u32 mad_status = be16_to_cpu(rsp->common.status);
4959	int level = IBMVFC_DEFAULT_LOG_LEVEL;
4960
4961	switch (mad_status) {
4962	case IBMVFC_MAD_SUCCESS:
4963		ibmvfc_dbg(vhost, "Discover Targets succeeded\n");
4964		vhost->num_targets = be32_to_cpu(rsp->num_written);
4965		ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_ALLOC_TGTS);
4966		break;
4967	case IBMVFC_MAD_FAILED:
4968		level += ibmvfc_retry_host_init(vhost);
4969		ibmvfc_log(vhost, level, "Discover Targets failed: %s (%x:%x)\n",
4970			   ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4971			   be16_to_cpu(rsp->status), be16_to_cpu(rsp->error));
4972		break;
4973	case IBMVFC_MAD_DRIVER_FAILED:
4974		break;
4975	default:
4976		dev_err(vhost->dev, "Invalid Discover Targets response: 0x%x\n", mad_status);
4977		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4978		break;
4979	}
4980
4981	ibmvfc_free_event(evt);
4982	wake_up(&vhost->work_wait_q);
4983}
4984
4985/**
4986 * ibmvfc_discover_targets - Send Discover Targets MAD
4987 * @vhost:	ibmvfc host struct
4988 *
4989 **/
4990static void ibmvfc_discover_targets(struct ibmvfc_host *vhost)
4991{
4992	struct ibmvfc_discover_targets *mad;
4993	struct ibmvfc_event *evt = ibmvfc_get_reserved_event(&vhost->crq);
4994	int level = IBMVFC_DEFAULT_LOG_LEVEL;
4995
4996	if (!evt) {
4997		ibmvfc_log(vhost, level, "Discover Targets failed: no available events\n");
4998		ibmvfc_hard_reset_host(vhost);
4999		return;
5000	}
5001
5002	ibmvfc_init_event(evt, ibmvfc_discover_targets_done, IBMVFC_MAD_FORMAT);
5003	mad = &evt->iu.discover_targets;
5004	memset(mad, 0, sizeof(*mad));
5005	mad->common.version = cpu_to_be32(1);
5006	mad->common.opcode = cpu_to_be32(IBMVFC_DISC_TARGETS);
5007	mad->common.length = cpu_to_be16(sizeof(*mad));
5008	mad->bufflen = cpu_to_be32(vhost->scsi_scrqs.disc_buf_sz);
5009	mad->buffer.va = cpu_to_be64(vhost->scsi_scrqs.disc_buf_dma);
5010	mad->buffer.len = cpu_to_be32(vhost->scsi_scrqs.disc_buf_sz);
5011	mad->flags = cpu_to_be32(IBMVFC_DISC_TGT_PORT_ID_WWPN_LIST);
5012	ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
5013
5014	if (!ibmvfc_send_event(evt, vhost, default_timeout))
5015		ibmvfc_dbg(vhost, "Sent discover targets\n");
5016	else
5017		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5018}
5019
5020static void ibmvfc_channel_setup_done(struct ibmvfc_event *evt)
5021{
5022	struct ibmvfc_host *vhost = evt->vhost;
5023	struct ibmvfc_channel_setup *setup = vhost->channel_setup_buf;
5024	struct ibmvfc_channels *scrqs = &vhost->scsi_scrqs;
5025	u32 mad_status = be16_to_cpu(evt->xfer_iu->channel_setup.common.status);
5026	int level = IBMVFC_DEFAULT_LOG_LEVEL;
5027	int flags, active_queues, i;
5028
5029	ibmvfc_free_event(evt);
5030
5031	switch (mad_status) {
5032	case IBMVFC_MAD_SUCCESS:
5033		ibmvfc_dbg(vhost, "Channel Setup succeeded\n");
5034		flags = be32_to_cpu(setup->flags);
5035		vhost->do_enquiry = 0;
5036		active_queues = be32_to_cpu(setup->num_scsi_subq_channels);
5037		scrqs->active_queues = active_queues;
5038
5039		if (flags & IBMVFC_CHANNELS_CANCELED) {
5040			ibmvfc_dbg(vhost, "Channels Canceled\n");
5041			vhost->using_channels = 0;
5042		} else {
5043			if (active_queues)
5044				vhost->using_channels = 1;
5045			for (i = 0; i < active_queues; i++)
5046				scrqs->scrqs[i].vios_cookie =
5047					be64_to_cpu(setup->channel_handles[i]);
5048
5049			ibmvfc_dbg(vhost, "Using %u channels\n",
5050				   vhost->scsi_scrqs.active_queues);
5051		}
5052		break;
5053	case IBMVFC_MAD_FAILED:
5054		level += ibmvfc_retry_host_init(vhost);
5055		ibmvfc_log(vhost, level, "Channel Setup failed\n");
5056		fallthrough;
5057	case IBMVFC_MAD_DRIVER_FAILED:
5058		return;
5059	default:
5060		dev_err(vhost->dev, "Invalid Channel Setup response: 0x%x\n",
5061			mad_status);
5062		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5063		return;
5064	}
5065
5066	ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
5067	wake_up(&vhost->work_wait_q);
5068}
5069
5070static void ibmvfc_channel_setup(struct ibmvfc_host *vhost)
5071{
5072	struct ibmvfc_channel_setup_mad *mad;
5073	struct ibmvfc_channel_setup *setup_buf = vhost->channel_setup_buf;
5074	struct ibmvfc_event *evt = ibmvfc_get_reserved_event(&vhost->crq);
5075	struct ibmvfc_channels *scrqs = &vhost->scsi_scrqs;
5076	unsigned int num_channels =
5077		min(scrqs->desired_queues, vhost->max_vios_scsi_channels);
5078	int level = IBMVFC_DEFAULT_LOG_LEVEL;
5079	int i;
5080
5081	if (!evt) {
5082		ibmvfc_log(vhost, level, "Channel Setup failed: no available events\n");
5083		ibmvfc_hard_reset_host(vhost);
5084		return;
5085	}
5086
5087	memset(setup_buf, 0, sizeof(*setup_buf));
5088	if (num_channels == 0)
5089		setup_buf->flags = cpu_to_be32(IBMVFC_CANCEL_CHANNELS);
5090	else {
5091		setup_buf->num_scsi_subq_channels = cpu_to_be32(num_channels);
5092		for (i = 0; i < num_channels; i++)
5093			setup_buf->channel_handles[i] = cpu_to_be64(scrqs->scrqs[i].cookie);
5094	}
5095
5096	ibmvfc_init_event(evt, ibmvfc_channel_setup_done, IBMVFC_MAD_FORMAT);
5097	mad = &evt->iu.channel_setup;
5098	memset(mad, 0, sizeof(*mad));
5099	mad->common.version = cpu_to_be32(1);
5100	mad->common.opcode = cpu_to_be32(IBMVFC_CHANNEL_SETUP);
5101	mad->common.length = cpu_to_be16(sizeof(*mad));
5102	mad->buffer.va = cpu_to_be64(vhost->channel_setup_dma);
5103	mad->buffer.len = cpu_to_be32(sizeof(*vhost->channel_setup_buf));
5104
5105	ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
5106
5107	if (!ibmvfc_send_event(evt, vhost, default_timeout))
5108		ibmvfc_dbg(vhost, "Sent channel setup\n");
5109	else
5110		ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
5111}
5112
5113static void ibmvfc_channel_enquiry_done(struct ibmvfc_event *evt)
5114{
5115	struct ibmvfc_host *vhost = evt->vhost;
5116	struct ibmvfc_channel_enquiry *rsp = &evt->xfer_iu->channel_enquiry;
5117	u32 mad_status = be16_to_cpu(rsp->common.status);
5118	int level = IBMVFC_DEFAULT_LOG_LEVEL;
5119
5120	switch (mad_status) {
5121	case IBMVFC_MAD_SUCCESS:
5122		ibmvfc_dbg(vhost, "Channel Enquiry succeeded\n");
5123		vhost->max_vios_scsi_channels = be32_to_cpu(rsp->num_scsi_subq_channels);
5124		ibmvfc_free_event(evt);
5125		break;
5126	case IBMVFC_MAD_FAILED:
5127		level += ibmvfc_retry_host_init(vhost);
5128		ibmvfc_log(vhost, level, "Channel Enquiry failed\n");
5129		fallthrough;
5130	case IBMVFC_MAD_DRIVER_FAILED:
5131		ibmvfc_free_event(evt);
5132		return;
5133	default:
5134		dev_err(vhost->dev, "Invalid Channel Enquiry response: 0x%x\n",
5135			mad_status);
5136		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5137		ibmvfc_free_event(evt);
5138		return;
5139	}
5140
5141	ibmvfc_channel_setup(vhost);
5142}
5143
5144static void ibmvfc_channel_enquiry(struct ibmvfc_host *vhost)
5145{
5146	struct ibmvfc_channel_enquiry *mad;
5147	struct ibmvfc_event *evt = ibmvfc_get_reserved_event(&vhost->crq);
5148	int level = IBMVFC_DEFAULT_LOG_LEVEL;
5149
5150	if (!evt) {
5151		ibmvfc_log(vhost, level, "Channel Enquiry failed: no available events\n");
5152		ibmvfc_hard_reset_host(vhost);
5153		return;
5154	}
5155
5156	ibmvfc_init_event(evt, ibmvfc_channel_enquiry_done, IBMVFC_MAD_FORMAT);
5157	mad = &evt->iu.channel_enquiry;
5158	memset(mad, 0, sizeof(*mad));
5159	mad->common.version = cpu_to_be32(1);
5160	mad->common.opcode = cpu_to_be32(IBMVFC_CHANNEL_ENQUIRY);
5161	mad->common.length = cpu_to_be16(sizeof(*mad));
5162
5163	if (mig_channels_only)
5164		mad->flags |= cpu_to_be32(IBMVFC_NO_CHANNELS_TO_CRQ_SUPPORT);
5165	if (mig_no_less_channels)
5166		mad->flags |= cpu_to_be32(IBMVFC_NO_N_TO_M_CHANNELS_SUPPORT);
5167
5168	ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
5169
5170	if (!ibmvfc_send_event(evt, vhost, default_timeout))
5171		ibmvfc_dbg(vhost, "Send channel enquiry\n");
5172	else
5173		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5174}
5175
5176/**
5177 * ibmvfc_npiv_login_done - Completion handler for NPIV Login
5178 * @evt:	ibmvfc event struct
5179 *
5180 **/
5181static void ibmvfc_npiv_login_done(struct ibmvfc_event *evt)
5182{
5183	struct ibmvfc_host *vhost = evt->vhost;
5184	u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_login.common.status);
5185	struct ibmvfc_npiv_login_resp *rsp = &vhost->login_buf->resp;
5186	unsigned int npiv_max_sectors;
5187	int level = IBMVFC_DEFAULT_LOG_LEVEL;
5188
5189	switch (mad_status) {
5190	case IBMVFC_MAD_SUCCESS:
5191		ibmvfc_free_event(evt);
5192		break;
5193	case IBMVFC_MAD_FAILED:
5194		if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
5195			level += ibmvfc_retry_host_init(vhost);
5196		else
5197			ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5198		ibmvfc_log(vhost, level, "NPIV Login failed: %s (%x:%x)\n",
5199			   ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
5200						be16_to_cpu(rsp->status), be16_to_cpu(rsp->error));
5201		ibmvfc_free_event(evt);
5202		return;
5203	case IBMVFC_MAD_CRQ_ERROR:
5204		ibmvfc_retry_host_init(vhost);
5205		fallthrough;
5206	case IBMVFC_MAD_DRIVER_FAILED:
5207		ibmvfc_free_event(evt);
5208		return;
5209	default:
5210		dev_err(vhost->dev, "Invalid NPIV Login response: 0x%x\n", mad_status);
5211		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5212		ibmvfc_free_event(evt);
5213		return;
5214	}
5215
5216	vhost->client_migrated = 0;
5217
5218	if (!(be32_to_cpu(rsp->flags) & IBMVFC_NATIVE_FC)) {
5219		dev_err(vhost->dev, "Virtual adapter does not support FC. %x\n",
5220			rsp->flags);
5221		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5222		wake_up(&vhost->work_wait_q);
5223		return;
5224	}
5225
5226	if (be32_to_cpu(rsp->max_cmds) <= IBMVFC_NUM_INTERNAL_REQ) {
5227		dev_err(vhost->dev, "Virtual adapter supported queue depth too small: %d\n",
5228			rsp->max_cmds);
5229		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5230		wake_up(&vhost->work_wait_q);
5231		return;
5232	}
5233
5234	vhost->logged_in = 1;
5235	npiv_max_sectors = min((uint)(be64_to_cpu(rsp->max_dma_len) >> 9), IBMVFC_MAX_SECTORS);
5236	dev_info(vhost->dev, "Host partition: %s, device: %s %s %s max sectors %u\n",
5237		 rsp->partition_name, rsp->device_name, rsp->port_loc_code,
5238		 rsp->drc_name, npiv_max_sectors);
5239
5240	fc_host_fabric_name(vhost->host) = be64_to_cpu(rsp->node_name);
5241	fc_host_node_name(vhost->host) = be64_to_cpu(rsp->node_name);
5242	fc_host_port_name(vhost->host) = be64_to_cpu(rsp->port_name);
5243	fc_host_port_id(vhost->host) = be64_to_cpu(rsp->scsi_id);
5244	fc_host_port_type(vhost->host) = FC_PORTTYPE_NPIV;
5245	fc_host_supported_classes(vhost->host) = 0;
5246	if (be32_to_cpu(rsp->service_parms.class1_parms[0]) & 0x80000000)
5247		fc_host_supported_classes(vhost->host) |= FC_COS_CLASS1;
5248	if (be32_to_cpu(rsp->service_parms.class2_parms[0]) & 0x80000000)
5249		fc_host_supported_classes(vhost->host) |= FC_COS_CLASS2;
5250	if (be32_to_cpu(rsp->service_parms.class3_parms[0]) & 0x80000000)
5251		fc_host_supported_classes(vhost->host) |= FC_COS_CLASS3;
5252	fc_host_maxframe_size(vhost->host) =
5253		be16_to_cpu(rsp->service_parms.common.bb_rcv_sz) & 0x0fff;
5254
5255	vhost->host->can_queue = be32_to_cpu(rsp->max_cmds) - IBMVFC_NUM_INTERNAL_REQ;
5256	vhost->host->max_sectors = npiv_max_sectors;
5257
5258	if (ibmvfc_check_caps(vhost, IBMVFC_CAN_SUPPORT_CHANNELS) && vhost->do_enquiry) {
5259		ibmvfc_channel_enquiry(vhost);
5260	} else {
5261		vhost->do_enquiry = 0;
5262		ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
5263		wake_up(&vhost->work_wait_q);
5264	}
5265}
5266
5267/**
5268 * ibmvfc_npiv_login - Sends NPIV login
5269 * @vhost:	ibmvfc host struct
5270 *
5271 **/
5272static void ibmvfc_npiv_login(struct ibmvfc_host *vhost)
5273{
5274	struct ibmvfc_npiv_login_mad *mad;
5275	struct ibmvfc_event *evt = ibmvfc_get_reserved_event(&vhost->crq);
5276
5277	if (!evt) {
5278		ibmvfc_dbg(vhost, "NPIV Login failed: no available events\n");
5279		ibmvfc_hard_reset_host(vhost);
5280		return;
5281	}
5282
5283	ibmvfc_gather_partition_info(vhost);
5284	ibmvfc_set_login_info(vhost);
5285	ibmvfc_init_event(evt, ibmvfc_npiv_login_done, IBMVFC_MAD_FORMAT);
5286
5287	memcpy(vhost->login_buf, &vhost->login_info, sizeof(vhost->login_info));
5288	mad = &evt->iu.npiv_login;
5289	memset(mad, 0, sizeof(struct ibmvfc_npiv_login_mad));
5290	mad->common.version = cpu_to_be32(1);
5291	mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGIN);
5292	mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_login_mad));
5293	mad->buffer.va = cpu_to_be64(vhost->login_buf_dma);
5294	mad->buffer.len = cpu_to_be32(sizeof(*vhost->login_buf));
5295
5296	ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
5297
5298	if (!ibmvfc_send_event(evt, vhost, default_timeout))
5299		ibmvfc_dbg(vhost, "Sent NPIV login\n");
5300	else
5301		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5302}
5303
5304/**
5305 * ibmvfc_npiv_logout_done - Completion handler for NPIV Logout
5306 * @evt:		ibmvfc event struct
5307 *
5308 **/
5309static void ibmvfc_npiv_logout_done(struct ibmvfc_event *evt)
5310{
5311	struct ibmvfc_host *vhost = evt->vhost;
5312	u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_logout.common.status);
5313
5314	ibmvfc_free_event(evt);
5315
5316	switch (mad_status) {
5317	case IBMVFC_MAD_SUCCESS:
5318		if (list_empty(&vhost->crq.sent) &&
5319		    vhost->action == IBMVFC_HOST_ACTION_LOGO_WAIT) {
5320			ibmvfc_init_host(vhost);
5321			return;
5322		}
5323		break;
5324	case IBMVFC_MAD_FAILED:
5325	case IBMVFC_MAD_NOT_SUPPORTED:
5326	case IBMVFC_MAD_CRQ_ERROR:
5327	case IBMVFC_MAD_DRIVER_FAILED:
5328	default:
5329		ibmvfc_dbg(vhost, "NPIV Logout failed. 0x%X\n", mad_status);
5330		break;
5331	}
5332
5333	ibmvfc_hard_reset_host(vhost);
5334}
5335
5336/**
5337 * ibmvfc_npiv_logout - Issue an NPIV Logout
5338 * @vhost:		ibmvfc host struct
5339 *
5340 **/
5341static void ibmvfc_npiv_logout(struct ibmvfc_host *vhost)
5342{
5343	struct ibmvfc_npiv_logout_mad *mad;
5344	struct ibmvfc_event *evt;
5345
5346	evt = ibmvfc_get_reserved_event(&vhost->crq);
5347	if (!evt) {
5348		ibmvfc_dbg(vhost, "NPIV Logout failed: no available events\n");
5349		ibmvfc_hard_reset_host(vhost);
5350		return;
5351	}
5352
5353	ibmvfc_init_event(evt, ibmvfc_npiv_logout_done, IBMVFC_MAD_FORMAT);
5354
5355	mad = &evt->iu.npiv_logout;
5356	memset(mad, 0, sizeof(*mad));
5357	mad->common.version = cpu_to_be32(1);
5358	mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGOUT);
5359	mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_logout_mad));
5360
5361	ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO_WAIT);
5362
5363	if (!ibmvfc_send_event(evt, vhost, default_timeout))
5364		ibmvfc_dbg(vhost, "Sent NPIV logout\n");
5365	else
5366		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5367}
5368
5369/**
5370 * ibmvfc_dev_init_to_do - Is there target initialization work to do?
5371 * @vhost:		ibmvfc host struct
5372 *
5373 * Returns:
5374 *	1 if work to do / 0 if not
5375 **/
5376static int ibmvfc_dev_init_to_do(struct ibmvfc_host *vhost)
5377{
5378	struct ibmvfc_target *tgt;
5379
5380	list_for_each_entry(tgt, &vhost->targets, queue) {
5381		if (tgt->action == IBMVFC_TGT_ACTION_INIT ||
5382		    tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
5383			return 1;
5384	}
5385
5386	return 0;
5387}
5388
5389/**
5390 * ibmvfc_dev_logo_to_do - Is there target logout work to do?
5391 * @vhost:		ibmvfc host struct
5392 *
5393 * Returns:
5394 *	1 if work to do / 0 if not
5395 **/
5396static int ibmvfc_dev_logo_to_do(struct ibmvfc_host *vhost)
5397{
5398	struct ibmvfc_target *tgt;
5399
5400	list_for_each_entry(tgt, &vhost->targets, queue) {
5401		if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT ||
5402		    tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT)
5403			return 1;
5404	}
5405	return 0;
5406}
5407
5408/**
5409 * __ibmvfc_work_to_do - Is there task level work to do? (no locking)
5410 * @vhost:		ibmvfc host struct
5411 *
5412 * Returns:
5413 *	1 if work to do / 0 if not
5414 **/
5415static int __ibmvfc_work_to_do(struct ibmvfc_host *vhost)
5416{
5417	struct ibmvfc_target *tgt;
5418
5419	if (kthread_should_stop())
5420		return 1;
5421	switch (vhost->action) {
5422	case IBMVFC_HOST_ACTION_NONE:
5423	case IBMVFC_HOST_ACTION_INIT_WAIT:
5424	case IBMVFC_HOST_ACTION_LOGO_WAIT:
5425		return 0;
5426	case IBMVFC_HOST_ACTION_TGT_INIT:
5427	case IBMVFC_HOST_ACTION_QUERY_TGTS:
5428		if (vhost->discovery_threads == disc_threads)
5429			return 0;
5430		list_for_each_entry(tgt, &vhost->targets, queue)
5431			if (tgt->action == IBMVFC_TGT_ACTION_INIT)
5432				return 1;
5433		list_for_each_entry(tgt, &vhost->targets, queue)
5434			if (tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
5435				return 0;
5436		return 1;
5437	case IBMVFC_HOST_ACTION_TGT_DEL:
5438	case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
5439		if (vhost->discovery_threads == disc_threads)
5440			return 0;
5441		list_for_each_entry(tgt, &vhost->targets, queue)
5442			if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT)
5443				return 1;
5444		list_for_each_entry(tgt, &vhost->targets, queue)
5445			if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT)
5446				return 0;
5447		return 1;
5448	case IBMVFC_HOST_ACTION_LOGO:
5449	case IBMVFC_HOST_ACTION_INIT:
5450	case IBMVFC_HOST_ACTION_ALLOC_TGTS:
 
 
5451	case IBMVFC_HOST_ACTION_QUERY:
5452	case IBMVFC_HOST_ACTION_RESET:
5453	case IBMVFC_HOST_ACTION_REENABLE:
5454	default:
5455		break;
5456	}
5457
5458	return 1;
5459}
5460
5461/**
5462 * ibmvfc_work_to_do - Is there task level work to do?
5463 * @vhost:		ibmvfc host struct
5464 *
5465 * Returns:
5466 *	1 if work to do / 0 if not
5467 **/
5468static int ibmvfc_work_to_do(struct ibmvfc_host *vhost)
5469{
5470	unsigned long flags;
5471	int rc;
5472
5473	spin_lock_irqsave(vhost->host->host_lock, flags);
5474	rc = __ibmvfc_work_to_do(vhost);
5475	spin_unlock_irqrestore(vhost->host->host_lock, flags);
5476	return rc;
5477}
5478
5479/**
5480 * ibmvfc_log_ae - Log async events if necessary
5481 * @vhost:		ibmvfc host struct
5482 * @events:		events to log
5483 *
5484 **/
5485static void ibmvfc_log_ae(struct ibmvfc_host *vhost, int events)
5486{
5487	if (events & IBMVFC_AE_RSCN)
5488		fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_RSCN, 0);
5489	if ((events & IBMVFC_AE_LINKDOWN) &&
5490	    vhost->state >= IBMVFC_HALTED)
5491		fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKDOWN, 0);
5492	if ((events & IBMVFC_AE_LINKUP) &&
5493	    vhost->state == IBMVFC_INITIALIZING)
5494		fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKUP, 0);
5495}
5496
5497/**
5498 * ibmvfc_tgt_add_rport - Tell the FC transport about a new remote port
5499 * @tgt:		ibmvfc target struct
5500 *
5501 **/
5502static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt)
5503{
5504	struct ibmvfc_host *vhost = tgt->vhost;
5505	struct fc_rport *rport;
5506	unsigned long flags;
5507
5508	tgt_dbg(tgt, "Adding rport\n");
5509	rport = fc_remote_port_add(vhost->host, 0, &tgt->ids);
5510	spin_lock_irqsave(vhost->host->host_lock, flags);
5511
5512	if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
5513		tgt_dbg(tgt, "Deleting rport\n");
5514		list_del(&tgt->queue);
5515		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
5516		spin_unlock_irqrestore(vhost->host->host_lock, flags);
5517		fc_remote_port_delete(rport);
5518		del_timer_sync(&tgt->timer);
5519		kref_put(&tgt->kref, ibmvfc_release_tgt);
5520		return;
5521	} else if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT) {
5522		tgt_dbg(tgt, "Deleting rport with outstanding I/O\n");
5523		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT);
5524		tgt->rport = NULL;
5525		tgt->init_retries = 0;
5526		spin_unlock_irqrestore(vhost->host->host_lock, flags);
5527		fc_remote_port_delete(rport);
5528		return;
5529	} else if (rport && tgt->action == IBMVFC_TGT_ACTION_DELETED_RPORT) {
5530		spin_unlock_irqrestore(vhost->host->host_lock, flags);
5531		return;
5532	}
5533
5534	if (rport) {
5535		tgt_dbg(tgt, "rport add succeeded\n");
5536		tgt->rport = rport;
5537		rport->maxframe_size = be16_to_cpu(tgt->service_parms.common.bb_rcv_sz) & 0x0fff;
5538		rport->supported_classes = 0;
5539		tgt->target_id = rport->scsi_target_id;
5540		if (be32_to_cpu(tgt->service_parms.class1_parms[0]) & 0x80000000)
5541			rport->supported_classes |= FC_COS_CLASS1;
5542		if (be32_to_cpu(tgt->service_parms.class2_parms[0]) & 0x80000000)
5543			rport->supported_classes |= FC_COS_CLASS2;
5544		if (be32_to_cpu(tgt->service_parms.class3_parms[0]) & 0x80000000)
5545			rport->supported_classes |= FC_COS_CLASS3;
5546		if (rport->rqst_q)
5547			blk_queue_max_segments(rport->rqst_q, 1);
5548	} else
5549		tgt_dbg(tgt, "rport add failed\n");
5550	spin_unlock_irqrestore(vhost->host->host_lock, flags);
5551}
5552
5553/**
5554 * ibmvfc_do_work - Do task level work
5555 * @vhost:		ibmvfc host struct
5556 *
5557 **/
5558static void ibmvfc_do_work(struct ibmvfc_host *vhost)
5559{
5560	struct ibmvfc_target *tgt;
5561	unsigned long flags;
5562	struct fc_rport *rport;
5563	LIST_HEAD(purge);
5564	int rc;
5565
5566	ibmvfc_log_ae(vhost, vhost->events_to_log);
5567	spin_lock_irqsave(vhost->host->host_lock, flags);
5568	vhost->events_to_log = 0;
5569	switch (vhost->action) {
5570	case IBMVFC_HOST_ACTION_NONE:
5571	case IBMVFC_HOST_ACTION_LOGO_WAIT:
5572	case IBMVFC_HOST_ACTION_INIT_WAIT:
5573		break;
5574	case IBMVFC_HOST_ACTION_RESET:
5575		list_splice_init(&vhost->purge, &purge);
5576		spin_unlock_irqrestore(vhost->host->host_lock, flags);
5577		ibmvfc_complete_purge(&purge);
5578		rc = ibmvfc_reset_crq(vhost);
5579
5580		spin_lock_irqsave(vhost->host->host_lock, flags);
5581		if (!rc || rc == H_CLOSED)
5582			vio_enable_interrupts(to_vio_dev(vhost->dev));
5583		if (vhost->action == IBMVFC_HOST_ACTION_RESET) {
5584			/*
5585			 * The only action we could have changed to would have
5586			 * been reenable, in which case, we skip the rest of
5587			 * this path and wait until we've done the re-enable
5588			 * before sending the crq init.
5589			 */
5590			vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
5591
5592			if (rc || (rc = ibmvfc_send_crq_init(vhost)) ||
5593			    (rc = vio_enable_interrupts(to_vio_dev(vhost->dev)))) {
5594				ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5595				dev_err(vhost->dev, "Error after reset (rc=%d)\n", rc);
5596			}
5597		}
5598		break;
5599	case IBMVFC_HOST_ACTION_REENABLE:
5600		list_splice_init(&vhost->purge, &purge);
5601		spin_unlock_irqrestore(vhost->host->host_lock, flags);
5602		ibmvfc_complete_purge(&purge);
5603		rc = ibmvfc_reenable_crq_queue(vhost);
5604
5605		spin_lock_irqsave(vhost->host->host_lock, flags);
5606		if (vhost->action == IBMVFC_HOST_ACTION_REENABLE) {
5607			/*
5608			 * The only action we could have changed to would have
5609			 * been reset, in which case, we skip the rest of this
5610			 * path and wait until we've done the reset before
5611			 * sending the crq init.
5612			 */
5613			vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
5614			if (rc || (rc = ibmvfc_send_crq_init(vhost))) {
5615				ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5616				dev_err(vhost->dev, "Error after enable (rc=%d)\n", rc);
5617			}
5618		}
5619		break;
5620	case IBMVFC_HOST_ACTION_LOGO:
5621		vhost->job_step(vhost);
5622		break;
5623	case IBMVFC_HOST_ACTION_INIT:
5624		BUG_ON(vhost->state != IBMVFC_INITIALIZING);
5625		if (vhost->delay_init) {
5626			vhost->delay_init = 0;
5627			spin_unlock_irqrestore(vhost->host->host_lock, flags);
5628			ssleep(15);
5629			return;
5630		} else
5631			vhost->job_step(vhost);
5632		break;
5633	case IBMVFC_HOST_ACTION_QUERY:
5634		list_for_each_entry(tgt, &vhost->targets, queue)
5635			ibmvfc_init_tgt(tgt, ibmvfc_tgt_query_target);
5636		ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY_TGTS);
5637		break;
5638	case IBMVFC_HOST_ACTION_QUERY_TGTS:
5639		list_for_each_entry(tgt, &vhost->targets, queue) {
5640			if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
5641				tgt->job_step(tgt);
5642				break;
5643			}
5644		}
5645
5646		if (!ibmvfc_dev_init_to_do(vhost))
5647			ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
5648		break;
5649	case IBMVFC_HOST_ACTION_TGT_DEL:
5650	case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
5651		list_for_each_entry(tgt, &vhost->targets, queue) {
5652			if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT) {
5653				tgt->job_step(tgt);
5654				break;
5655			}
5656		}
5657
5658		if (ibmvfc_dev_logo_to_do(vhost)) {
5659			spin_unlock_irqrestore(vhost->host->host_lock, flags);
5660			return;
5661		}
5662
5663		list_for_each_entry(tgt, &vhost->targets, queue) {
5664			if (tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
5665				tgt_dbg(tgt, "Deleting rport\n");
5666				rport = tgt->rport;
5667				tgt->rport = NULL;
5668				list_del(&tgt->queue);
5669				ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
5670				spin_unlock_irqrestore(vhost->host->host_lock, flags);
5671				if (rport)
5672					fc_remote_port_delete(rport);
5673				del_timer_sync(&tgt->timer);
5674				kref_put(&tgt->kref, ibmvfc_release_tgt);
5675				return;
5676			} else if (tgt->action == IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT) {
5677				tgt_dbg(tgt, "Deleting rport with I/O outstanding\n");
5678				rport = tgt->rport;
5679				tgt->rport = NULL;
5680				tgt->init_retries = 0;
5681				ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT);
5682
5683				/*
5684				 * If fast fail is enabled, we wait for it to fire and then clean up
5685				 * the old port, since we expect the fast fail timer to clean up the
5686				 * outstanding I/O faster than waiting for normal command timeouts.
5687				 * However, if fast fail is disabled, any I/O outstanding to the
5688				 * rport LUNs will stay outstanding indefinitely, since the EH handlers
5689				 * won't get invoked for I/O's timing out. If this is a NPIV failover
5690				 * scenario, the better alternative is to use the move login.
5691				 */
5692				if (rport && rport->fast_io_fail_tmo == -1)
5693					tgt->move_login = 1;
5694				spin_unlock_irqrestore(vhost->host->host_lock, flags);
5695				if (rport)
5696					fc_remote_port_delete(rport);
5697				return;
5698			}
5699		}
5700
5701		if (vhost->state == IBMVFC_INITIALIZING) {
5702			if (vhost->action == IBMVFC_HOST_ACTION_TGT_DEL_FAILED) {
5703				if (vhost->reinit) {
5704					vhost->reinit = 0;
5705					scsi_block_requests(vhost->host);
5706					ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
5707					spin_unlock_irqrestore(vhost->host->host_lock, flags);
5708				} else {
5709					ibmvfc_set_host_state(vhost, IBMVFC_ACTIVE);
5710					ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
5711					wake_up(&vhost->init_wait_q);
5712					schedule_work(&vhost->rport_add_work_q);
5713					vhost->init_retries = 0;
5714					spin_unlock_irqrestore(vhost->host->host_lock, flags);
5715					scsi_unblock_requests(vhost->host);
5716				}
5717
5718				return;
5719			} else {
5720				ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
5721				vhost->job_step = ibmvfc_discover_targets;
5722			}
5723		} else {
5724			ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
5725			spin_unlock_irqrestore(vhost->host->host_lock, flags);
5726			scsi_unblock_requests(vhost->host);
5727			wake_up(&vhost->init_wait_q);
5728			return;
5729		}
5730		break;
5731	case IBMVFC_HOST_ACTION_ALLOC_TGTS:
5732		ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_INIT);
5733		spin_unlock_irqrestore(vhost->host->host_lock, flags);
5734		ibmvfc_alloc_targets(vhost);
5735		spin_lock_irqsave(vhost->host->host_lock, flags);
5736		break;
5737	case IBMVFC_HOST_ACTION_TGT_INIT:
5738		list_for_each_entry(tgt, &vhost->targets, queue) {
5739			if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
5740				tgt->job_step(tgt);
5741				break;
5742			}
5743		}
5744
5745		if (!ibmvfc_dev_init_to_do(vhost))
5746			ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL_FAILED);
5747		break;
5748	default:
5749		break;
5750	}
5751
5752	spin_unlock_irqrestore(vhost->host->host_lock, flags);
5753}
5754
5755/**
5756 * ibmvfc_work - Do task level work
5757 * @data:		ibmvfc host struct
5758 *
5759 * Returns:
5760 *	zero
5761 **/
5762static int ibmvfc_work(void *data)
5763{
5764	struct ibmvfc_host *vhost = data;
5765	int rc;
5766
5767	set_user_nice(current, MIN_NICE);
5768
5769	while (1) {
5770		rc = wait_event_interruptible(vhost->work_wait_q,
5771					      ibmvfc_work_to_do(vhost));
5772
5773		BUG_ON(rc);
5774
5775		if (kthread_should_stop())
5776			break;
5777
5778		ibmvfc_do_work(vhost);
5779	}
5780
5781	ibmvfc_dbg(vhost, "ibmvfc kthread exiting...\n");
5782	return 0;
5783}
5784
5785/**
5786 * ibmvfc_alloc_queue - Allocate queue
5787 * @vhost:	ibmvfc host struct
5788 * @queue:	ibmvfc queue to allocate
5789 * @fmt:	queue format to allocate
5790 *
5791 * Returns:
5792 *	0 on success / non-zero on failure
5793 **/
5794static int ibmvfc_alloc_queue(struct ibmvfc_host *vhost,
5795			      struct ibmvfc_queue *queue,
5796			      enum ibmvfc_msg_fmt fmt)
5797{
5798	struct device *dev = vhost->dev;
5799	size_t fmt_size;
5800
5801	ENTER;
5802	spin_lock_init(&queue->_lock);
5803	queue->q_lock = &queue->_lock;
5804
5805	switch (fmt) {
5806	case IBMVFC_CRQ_FMT:
5807		fmt_size = sizeof(*queue->msgs.crq);
5808		queue->total_depth = scsi_qdepth + IBMVFC_NUM_INTERNAL_REQ;
5809		queue->evt_depth = scsi_qdepth;
5810		queue->reserved_depth = IBMVFC_NUM_INTERNAL_REQ;
5811		break;
5812	case IBMVFC_ASYNC_FMT:
5813		fmt_size = sizeof(*queue->msgs.async);
5814		break;
5815	case IBMVFC_SUB_CRQ_FMT:
5816		fmt_size = sizeof(*queue->msgs.scrq);
5817		/* We need one extra event for Cancel Commands */
5818		queue->total_depth = scsi_qdepth + IBMVFC_NUM_INTERNAL_SUBQ_REQ;
5819		queue->evt_depth = scsi_qdepth;
5820		queue->reserved_depth = IBMVFC_NUM_INTERNAL_SUBQ_REQ;
5821		break;
5822	default:
5823		dev_warn(dev, "Unknown command/response queue message format: %d\n", fmt);
5824		return -EINVAL;
5825	}
5826
5827	queue->fmt = fmt;
5828	if (ibmvfc_init_event_pool(vhost, queue)) {
5829		dev_err(dev, "Couldn't initialize event pool.\n");
5830		return -ENOMEM;
5831	}
5832
5833	queue->msgs.handle = (void *)get_zeroed_page(GFP_KERNEL);
5834	if (!queue->msgs.handle)
5835		return -ENOMEM;
5836
5837	queue->msg_token = dma_map_single(dev, queue->msgs.handle, PAGE_SIZE,
5838					  DMA_BIDIRECTIONAL);
5839
5840	if (dma_mapping_error(dev, queue->msg_token)) {
5841		free_page((unsigned long)queue->msgs.handle);
5842		queue->msgs.handle = NULL;
5843		return -ENOMEM;
5844	}
5845
5846	queue->cur = 0;
5847	queue->size = PAGE_SIZE / fmt_size;
5848
5849	queue->vhost = vhost;
5850	return 0;
5851}
5852
5853/**
5854 * ibmvfc_init_crq - Initializes and registers CRQ with hypervisor
5855 * @vhost:	ibmvfc host struct
5856 *
5857 * Allocates a page for messages, maps it for dma, and registers
5858 * the crq with the hypervisor.
5859 *
5860 * Return value:
5861 *	zero on success / other on failure
5862 **/
5863static int ibmvfc_init_crq(struct ibmvfc_host *vhost)
5864{
5865	int rc, retrc = -ENOMEM;
5866	struct device *dev = vhost->dev;
5867	struct vio_dev *vdev = to_vio_dev(dev);
5868	struct ibmvfc_queue *crq = &vhost->crq;
5869
5870	ENTER;
5871	if (ibmvfc_alloc_queue(vhost, crq, IBMVFC_CRQ_FMT))
 
 
5872		return -ENOMEM;
5873
 
 
 
 
 
 
 
5874	retrc = rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
5875					crq->msg_token, PAGE_SIZE);
5876
5877	if (rc == H_RESOURCE)
5878		/* maybe kexecing and resource is busy. try a reset */
5879		retrc = rc = ibmvfc_reset_crq(vhost);
5880
5881	if (rc == H_CLOSED)
5882		dev_warn(dev, "Partner adapter not ready\n");
5883	else if (rc) {
5884		dev_warn(dev, "Error %d opening adapter\n", rc);
5885		goto reg_crq_failed;
5886	}
5887
5888	retrc = 0;
5889
5890	tasklet_init(&vhost->tasklet, (void *)ibmvfc_tasklet, (unsigned long)vhost);
5891
5892	if ((rc = request_irq(vdev->irq, ibmvfc_interrupt, 0, IBMVFC_NAME, vhost))) {
5893		dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n", vdev->irq, rc);
5894		goto req_irq_failed;
5895	}
5896
5897	if ((rc = vio_enable_interrupts(vdev))) {
5898		dev_err(dev, "Error %d enabling interrupts\n", rc);
5899		goto req_irq_failed;
5900	}
5901
 
5902	LEAVE;
5903	return retrc;
5904
5905req_irq_failed:
5906	tasklet_kill(&vhost->tasklet);
5907	do {
5908		rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
5909	} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
5910reg_crq_failed:
5911	ibmvfc_free_queue(vhost, crq);
 
 
5912	return retrc;
5913}
5914
5915static int ibmvfc_register_channel(struct ibmvfc_host *vhost,
5916				   struct ibmvfc_channels *channels,
5917				   int index)
5918{
5919	struct device *dev = vhost->dev;
5920	struct vio_dev *vdev = to_vio_dev(dev);
5921	struct ibmvfc_queue *scrq = &channels->scrqs[index];
5922	int rc = -ENOMEM;
5923
5924	ENTER;
5925
5926	rc = h_reg_sub_crq(vdev->unit_address, scrq->msg_token, PAGE_SIZE,
5927			   &scrq->cookie, &scrq->hw_irq);
5928
5929	/* H_CLOSED indicates successful register, but no CRQ partner */
5930	if (rc && rc != H_CLOSED) {
5931		dev_warn(dev, "Error registering sub-crq: %d\n", rc);
5932		if (rc == H_PARAMETER)
5933			dev_warn_once(dev, "Firmware may not support MQ\n");
5934		goto reg_failed;
5935	}
5936
5937	scrq->irq = irq_create_mapping(NULL, scrq->hw_irq);
5938
5939	if (!scrq->irq) {
5940		rc = -EINVAL;
5941		dev_err(dev, "Error mapping sub-crq[%d] irq\n", index);
5942		goto irq_failed;
5943	}
5944
5945	switch (channels->protocol) {
5946	case IBMVFC_PROTO_SCSI:
5947		snprintf(scrq->name, sizeof(scrq->name), "ibmvfc-%x-scsi%d",
5948			 vdev->unit_address, index);
5949		scrq->handler = ibmvfc_interrupt_mq;
5950		break;
5951	case IBMVFC_PROTO_NVME:
5952		snprintf(scrq->name, sizeof(scrq->name), "ibmvfc-%x-nvmf%d",
5953			 vdev->unit_address, index);
5954		scrq->handler = ibmvfc_interrupt_mq;
5955		break;
5956	default:
5957		dev_err(dev, "Unknown channel protocol (%d)\n",
5958			channels->protocol);
5959		goto irq_failed;
5960	}
5961
5962	rc = request_irq(scrq->irq, scrq->handler, 0, scrq->name, scrq);
5963
5964	if (rc) {
5965		dev_err(dev, "Couldn't register sub-crq[%d] irq\n", index);
5966		irq_dispose_mapping(scrq->irq);
5967		goto irq_failed;
5968	}
5969
5970	scrq->hwq_id = index;
5971
5972	LEAVE;
5973	return 0;
5974
5975irq_failed:
5976	do {
5977		rc = plpar_hcall_norets(H_FREE_SUB_CRQ, vdev->unit_address, scrq->cookie);
5978	} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
5979reg_failed:
5980	LEAVE;
5981	return rc;
5982}
5983
5984static void ibmvfc_deregister_channel(struct ibmvfc_host *vhost,
5985				      struct ibmvfc_channels *channels,
5986				      int index)
5987{
5988	struct device *dev = vhost->dev;
5989	struct vio_dev *vdev = to_vio_dev(dev);
5990	struct ibmvfc_queue *scrq = &channels->scrqs[index];
5991	long rc;
5992
5993	ENTER;
5994
5995	free_irq(scrq->irq, scrq);
5996	irq_dispose_mapping(scrq->irq);
5997	scrq->irq = 0;
5998
5999	do {
6000		rc = plpar_hcall_norets(H_FREE_SUB_CRQ, vdev->unit_address,
6001					scrq->cookie);
6002	} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
6003
6004	if (rc)
6005		dev_err(dev, "Failed to free sub-crq[%d]: rc=%ld\n", index, rc);
6006
6007	/* Clean out the queue */
6008	memset(scrq->msgs.crq, 0, PAGE_SIZE);
6009	scrq->cur = 0;
6010
6011	LEAVE;
6012}
6013
6014static void ibmvfc_reg_sub_crqs(struct ibmvfc_host *vhost,
6015				struct ibmvfc_channels *channels)
6016{
6017	int i, j;
6018
6019	ENTER;
6020	if (!vhost->mq_enabled || !channels->scrqs)
6021		return;
6022
6023	for (i = 0; i < channels->max_queues; i++) {
6024		if (ibmvfc_register_channel(vhost, channels, i)) {
6025			for (j = i; j > 0; j--)
6026				ibmvfc_deregister_channel(vhost, channels, j - 1);
6027			vhost->do_enquiry = 0;
6028			return;
6029		}
6030	}
6031
6032	LEAVE;
6033}
6034
6035static void ibmvfc_dereg_sub_crqs(struct ibmvfc_host *vhost,
6036				  struct ibmvfc_channels *channels)
6037{
6038	int i;
6039
6040	ENTER;
6041	if (!vhost->mq_enabled || !channels->scrqs)
6042		return;
6043
6044	for (i = 0; i < channels->max_queues; i++)
6045		ibmvfc_deregister_channel(vhost, channels, i);
6046
6047	LEAVE;
6048}
6049
6050static int ibmvfc_alloc_channels(struct ibmvfc_host *vhost,
6051				 struct ibmvfc_channels *channels)
6052{
6053	struct ibmvfc_queue *scrq;
6054	int i, j;
6055	int rc = 0;
6056
6057	channels->scrqs = kcalloc(channels->max_queues,
6058				  sizeof(*channels->scrqs),
6059				  GFP_KERNEL);
6060	if (!channels->scrqs)
6061		return -ENOMEM;
6062
6063	for (i = 0; i < channels->max_queues; i++) {
6064		scrq = &channels->scrqs[i];
6065		rc = ibmvfc_alloc_queue(vhost, scrq, IBMVFC_SUB_CRQ_FMT);
6066		if (rc) {
6067			for (j = i; j > 0; j--) {
6068				scrq = &channels->scrqs[j - 1];
6069				ibmvfc_free_queue(vhost, scrq);
6070			}
6071			kfree(channels->scrqs);
6072			channels->scrqs = NULL;
6073			channels->active_queues = 0;
6074			return rc;
6075		}
6076	}
6077
6078	return rc;
6079}
6080
6081static void ibmvfc_init_sub_crqs(struct ibmvfc_host *vhost)
6082{
6083	ENTER;
6084	if (!vhost->mq_enabled)
6085		return;
6086
6087	if (ibmvfc_alloc_channels(vhost, &vhost->scsi_scrqs)) {
6088		vhost->do_enquiry = 0;
6089		vhost->mq_enabled = 0;
6090		return;
6091	}
6092
6093	ibmvfc_reg_sub_crqs(vhost, &vhost->scsi_scrqs);
6094
6095	LEAVE;
6096}
6097
6098static void ibmvfc_release_channels(struct ibmvfc_host *vhost,
6099				    struct ibmvfc_channels *channels)
6100{
6101	struct ibmvfc_queue *scrq;
6102	int i;
6103
6104	if (channels->scrqs) {
6105		for (i = 0; i < channels->max_queues; i++) {
6106			scrq = &channels->scrqs[i];
6107			ibmvfc_free_queue(vhost, scrq);
6108		}
6109
6110		kfree(channels->scrqs);
6111		channels->scrqs = NULL;
6112		channels->active_queues = 0;
6113	}
6114}
6115
6116static void ibmvfc_release_sub_crqs(struct ibmvfc_host *vhost)
6117{
6118	ENTER;
6119	if (!vhost->scsi_scrqs.scrqs)
6120		return;
6121
6122	ibmvfc_dereg_sub_crqs(vhost, &vhost->scsi_scrqs);
6123
6124	ibmvfc_release_channels(vhost, &vhost->scsi_scrqs);
6125	LEAVE;
6126}
6127
6128static void ibmvfc_free_disc_buf(struct device *dev, struct ibmvfc_channels *channels)
6129{
6130	dma_free_coherent(dev, channels->disc_buf_sz, channels->disc_buf,
6131			  channels->disc_buf_dma);
6132}
6133
6134/**
6135 * ibmvfc_free_mem - Free memory for vhost
6136 * @vhost:	ibmvfc host struct
6137 *
6138 * Return value:
6139 * 	none
6140 **/
6141static void ibmvfc_free_mem(struct ibmvfc_host *vhost)
6142{
6143	struct ibmvfc_queue *async_q = &vhost->async_crq;
6144
6145	ENTER;
6146	mempool_destroy(vhost->tgt_pool);
6147	kfree(vhost->trace);
6148	ibmvfc_free_disc_buf(vhost->dev, &vhost->scsi_scrqs);
 
6149	dma_free_coherent(vhost->dev, sizeof(*vhost->login_buf),
6150			  vhost->login_buf, vhost->login_buf_dma);
6151	dma_free_coherent(vhost->dev, sizeof(*vhost->channel_setup_buf),
6152			  vhost->channel_setup_buf, vhost->channel_setup_dma);
6153	dma_pool_destroy(vhost->sg_pool);
6154	ibmvfc_free_queue(vhost, async_q);
 
 
6155	LEAVE;
6156}
6157
6158static int ibmvfc_alloc_disc_buf(struct device *dev, struct ibmvfc_channels *channels)
6159{
6160	channels->disc_buf_sz = sizeof(*channels->disc_buf) * max_targets;
6161	channels->disc_buf = dma_alloc_coherent(dev, channels->disc_buf_sz,
6162					     &channels->disc_buf_dma, GFP_KERNEL);
6163
6164	if (!channels->disc_buf) {
6165		dev_err(dev, "Couldn't allocate %s Discover Targets buffer\n",
6166			(channels->protocol == IBMVFC_PROTO_SCSI) ? "SCSI" : "NVMe");
6167		return -ENOMEM;
6168	}
6169
6170	return 0;
6171}
6172
6173/**
6174 * ibmvfc_alloc_mem - Allocate memory for vhost
6175 * @vhost:	ibmvfc host struct
6176 *
6177 * Return value:
6178 * 	0 on success / non-zero on failure
6179 **/
6180static int ibmvfc_alloc_mem(struct ibmvfc_host *vhost)
6181{
6182	struct ibmvfc_queue *async_q = &vhost->async_crq;
6183	struct device *dev = vhost->dev;
6184
6185	ENTER;
6186	if (ibmvfc_alloc_queue(vhost, async_q, IBMVFC_ASYNC_FMT)) {
6187		dev_err(dev, "Couldn't allocate/map async queue.\n");
 
6188		goto nomem;
6189	}
6190
 
 
 
 
 
 
 
 
 
 
6191	vhost->sg_pool = dma_pool_create(IBMVFC_NAME, dev,
6192					 SG_ALL * sizeof(struct srp_direct_buf),
6193					 sizeof(struct srp_direct_buf), 0);
6194
6195	if (!vhost->sg_pool) {
6196		dev_err(dev, "Failed to allocate sg pool\n");
6197		goto unmap_async_crq;
6198	}
6199
6200	vhost->login_buf = dma_alloc_coherent(dev, sizeof(*vhost->login_buf),
6201					      &vhost->login_buf_dma, GFP_KERNEL);
6202
6203	if (!vhost->login_buf) {
6204		dev_err(dev, "Couldn't allocate NPIV login buffer\n");
6205		goto free_sg_pool;
6206	}
6207
6208	if (ibmvfc_alloc_disc_buf(dev, &vhost->scsi_scrqs))
 
 
 
 
 
6209		goto free_login_buffer;
 
6210
6211	vhost->trace = kcalloc(IBMVFC_NUM_TRACE_ENTRIES,
6212			       sizeof(struct ibmvfc_trace_entry), GFP_KERNEL);
6213	atomic_set(&vhost->trace_index, -1);
6214
6215	if (!vhost->trace)
6216		goto free_scsi_disc_buffer;
6217
6218	vhost->tgt_pool = mempool_create_kmalloc_pool(IBMVFC_TGT_MEMPOOL_SZ,
6219						      sizeof(struct ibmvfc_target));
6220
6221	if (!vhost->tgt_pool) {
6222		dev_err(dev, "Couldn't allocate target memory pool\n");
6223		goto free_trace;
6224	}
6225
6226	vhost->channel_setup_buf = dma_alloc_coherent(dev, sizeof(*vhost->channel_setup_buf),
6227						      &vhost->channel_setup_dma,
6228						      GFP_KERNEL);
6229
6230	if (!vhost->channel_setup_buf) {
6231		dev_err(dev, "Couldn't allocate Channel Setup buffer\n");
6232		goto free_tgt_pool;
6233	}
6234
6235	LEAVE;
6236	return 0;
6237
6238free_tgt_pool:
6239	mempool_destroy(vhost->tgt_pool);
6240free_trace:
6241	kfree(vhost->trace);
6242free_scsi_disc_buffer:
6243	ibmvfc_free_disc_buf(dev, &vhost->scsi_scrqs);
 
6244free_login_buffer:
6245	dma_free_coherent(dev, sizeof(*vhost->login_buf),
6246			  vhost->login_buf, vhost->login_buf_dma);
6247free_sg_pool:
6248	dma_pool_destroy(vhost->sg_pool);
6249unmap_async_crq:
6250	ibmvfc_free_queue(vhost, async_q);
 
 
 
6251nomem:
6252	LEAVE;
6253	return -ENOMEM;
6254}
6255
6256/**
6257 * ibmvfc_rport_add_thread - Worker thread for rport adds
6258 * @work:	work struct
6259 *
6260 **/
6261static void ibmvfc_rport_add_thread(struct work_struct *work)
6262{
6263	struct ibmvfc_host *vhost = container_of(work, struct ibmvfc_host,
6264						 rport_add_work_q);
6265	struct ibmvfc_target *tgt;
6266	struct fc_rport *rport;
6267	unsigned long flags;
6268	int did_work;
6269
6270	ENTER;
6271	spin_lock_irqsave(vhost->host->host_lock, flags);
6272	do {
6273		did_work = 0;
6274		if (vhost->state != IBMVFC_ACTIVE)
6275			break;
6276
6277		list_for_each_entry(tgt, &vhost->targets, queue) {
6278			if (tgt->add_rport) {
6279				did_work = 1;
6280				tgt->add_rport = 0;
6281				kref_get(&tgt->kref);
6282				rport = tgt->rport;
6283				if (!rport) {
6284					spin_unlock_irqrestore(vhost->host->host_lock, flags);
6285					ibmvfc_tgt_add_rport(tgt);
6286				} else if (get_device(&rport->dev)) {
6287					spin_unlock_irqrestore(vhost->host->host_lock, flags);
6288					tgt_dbg(tgt, "Setting rport roles\n");
6289					fc_remote_port_rolechg(rport, tgt->ids.roles);
6290					put_device(&rport->dev);
6291				} else {
6292					spin_unlock_irqrestore(vhost->host->host_lock, flags);
6293				}
6294
6295				kref_put(&tgt->kref, ibmvfc_release_tgt);
6296				spin_lock_irqsave(vhost->host->host_lock, flags);
6297				break;
6298			}
6299		}
6300	} while(did_work);
6301
6302	if (vhost->state == IBMVFC_ACTIVE)
6303		vhost->scan_complete = 1;
6304	spin_unlock_irqrestore(vhost->host->host_lock, flags);
6305	LEAVE;
6306}
6307
6308/**
6309 * ibmvfc_probe - Adapter hot plug add entry point
6310 * @vdev:	vio device struct
6311 * @id:	vio device id struct
6312 *
6313 * Return value:
6314 * 	0 on success / non-zero on failure
6315 **/
6316static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
6317{
6318	struct ibmvfc_host *vhost;
6319	struct Scsi_Host *shost;
6320	struct device *dev = &vdev->dev;
6321	int rc = -ENOMEM;
6322	unsigned int online_cpus = num_online_cpus();
6323	unsigned int max_scsi_queues = min((unsigned int)IBMVFC_MAX_SCSI_QUEUES, online_cpus);
6324
6325	ENTER;
6326	shost = scsi_host_alloc(&driver_template, sizeof(*vhost));
6327	if (!shost) {
6328		dev_err(dev, "Couldn't allocate host data\n");
6329		goto out;
6330	}
6331
6332	shost->transportt = ibmvfc_transport_template;
6333	shost->can_queue = scsi_qdepth;
6334	shost->max_lun = max_lun;
6335	shost->max_id = max_targets;
6336	shost->max_sectors = IBMVFC_MAX_SECTORS;
6337	shost->max_cmd_len = IBMVFC_MAX_CDB_LEN;
6338	shost->unique_id = shost->host_no;
6339	shost->nr_hw_queues = mq_enabled ? min(max_scsi_queues, nr_scsi_hw_queues) : 1;
6340
6341	vhost = shost_priv(shost);
 
 
6342	INIT_LIST_HEAD(&vhost->targets);
6343	INIT_LIST_HEAD(&vhost->purge);
6344	sprintf(vhost->name, IBMVFC_NAME);
6345	vhost->host = shost;
6346	vhost->dev = dev;
6347	vhost->partition_number = -1;
6348	vhost->log_level = log_level;
6349	vhost->task_set = 1;
6350
6351	vhost->mq_enabled = mq_enabled;
6352	vhost->scsi_scrqs.desired_queues = min(shost->nr_hw_queues, nr_scsi_channels);
6353	vhost->scsi_scrqs.max_queues = shost->nr_hw_queues;
6354	vhost->scsi_scrqs.protocol = IBMVFC_PROTO_SCSI;
6355	vhost->using_channels = 0;
6356	vhost->do_enquiry = 1;
6357	vhost->scan_timeout = 0;
6358
6359	strcpy(vhost->partition_name, "UNKNOWN");
6360	init_waitqueue_head(&vhost->work_wait_q);
6361	init_waitqueue_head(&vhost->init_wait_q);
6362	INIT_WORK(&vhost->rport_add_work_q, ibmvfc_rport_add_thread);
6363	mutex_init(&vhost->passthru_mutex);
6364
6365	if ((rc = ibmvfc_alloc_mem(vhost)))
6366		goto free_scsi_host;
6367
6368	vhost->work_thread = kthread_run(ibmvfc_work, vhost, "%s_%d", IBMVFC_NAME,
6369					 shost->host_no);
6370
6371	if (IS_ERR(vhost->work_thread)) {
6372		dev_err(dev, "Couldn't create kernel thread: %ld\n",
6373			PTR_ERR(vhost->work_thread));
6374		rc = PTR_ERR(vhost->work_thread);
6375		goto free_host_mem;
6376	}
6377
6378	if ((rc = ibmvfc_init_crq(vhost))) {
6379		dev_err(dev, "Couldn't initialize crq. rc=%d\n", rc);
6380		goto kill_kthread;
6381	}
6382
6383	if ((rc = scsi_add_host(shost, dev)))
 
6384		goto release_crq;
 
 
 
 
6385
6386	fc_host_dev_loss_tmo(shost) = IBMVFC_DEV_LOSS_TMO;
6387
6388	if ((rc = ibmvfc_create_trace_file(&shost->shost_dev.kobj,
6389					   &ibmvfc_trace_attr))) {
6390		dev_err(dev, "Failed to create trace file. rc=%d\n", rc);
6391		goto remove_shost;
6392	}
6393
6394	ibmvfc_init_sub_crqs(vhost);
6395
6396	if (shost_to_fc_host(shost)->rqst_q)
6397		blk_queue_max_segments(shost_to_fc_host(shost)->rqst_q, 1);
6398	dev_set_drvdata(dev, vhost);
6399	spin_lock(&ibmvfc_driver_lock);
6400	list_add_tail(&vhost->queue, &ibmvfc_head);
6401	spin_unlock(&ibmvfc_driver_lock);
6402
6403	ibmvfc_send_crq_init(vhost);
6404	scsi_scan_host(shost);
6405	return 0;
6406
6407remove_shost:
6408	scsi_remove_host(shost);
 
 
6409release_crq:
6410	ibmvfc_release_crq_queue(vhost);
6411kill_kthread:
6412	kthread_stop(vhost->work_thread);
6413free_host_mem:
6414	ibmvfc_free_mem(vhost);
6415free_scsi_host:
6416	scsi_host_put(shost);
6417out:
6418	LEAVE;
6419	return rc;
6420}
6421
6422/**
6423 * ibmvfc_remove - Adapter hot plug remove entry point
6424 * @vdev:	vio device struct
6425 *
6426 * Return value:
6427 * 	0
6428 **/
6429static void ibmvfc_remove(struct vio_dev *vdev)
6430{
6431	struct ibmvfc_host *vhost = dev_get_drvdata(&vdev->dev);
6432	LIST_HEAD(purge);
6433	unsigned long flags;
6434
6435	ENTER;
6436	ibmvfc_remove_trace_file(&vhost->host->shost_dev.kobj, &ibmvfc_trace_attr);
6437
6438	spin_lock_irqsave(vhost->host->host_lock, flags);
6439	ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
6440	spin_unlock_irqrestore(vhost->host->host_lock, flags);
6441
6442	ibmvfc_wait_while_resetting(vhost);
 
6443	kthread_stop(vhost->work_thread);
6444	fc_remove_host(vhost->host);
6445	scsi_remove_host(vhost->host);
6446
6447	spin_lock_irqsave(vhost->host->host_lock, flags);
6448	ibmvfc_purge_requests(vhost, DID_ERROR);
6449	list_splice_init(&vhost->purge, &purge);
6450	spin_unlock_irqrestore(vhost->host->host_lock, flags);
6451	ibmvfc_complete_purge(&purge);
6452	ibmvfc_release_sub_crqs(vhost);
6453	ibmvfc_release_crq_queue(vhost);
6454
6455	ibmvfc_free_mem(vhost);
6456	spin_lock(&ibmvfc_driver_lock);
6457	list_del(&vhost->queue);
6458	spin_unlock(&ibmvfc_driver_lock);
6459	scsi_host_put(vhost->host);
6460	LEAVE;
 
6461}
6462
6463/**
6464 * ibmvfc_resume - Resume from suspend
6465 * @dev:	device struct
6466 *
6467 * We may have lost an interrupt across suspend/resume, so kick the
6468 * interrupt handler
6469 *
6470 */
6471static int ibmvfc_resume(struct device *dev)
6472{
6473	unsigned long flags;
6474	struct ibmvfc_host *vhost = dev_get_drvdata(dev);
6475	struct vio_dev *vdev = to_vio_dev(dev);
6476
6477	spin_lock_irqsave(vhost->host->host_lock, flags);
6478	vio_disable_interrupts(vdev);
6479	tasklet_schedule(&vhost->tasklet);
6480	spin_unlock_irqrestore(vhost->host->host_lock, flags);
6481	return 0;
6482}
6483
6484/**
6485 * ibmvfc_get_desired_dma - Calculate DMA resources needed by the driver
6486 * @vdev:	vio device struct
6487 *
6488 * Return value:
6489 *	Number of bytes the driver will need to DMA map at the same time in
6490 *	order to perform well.
6491 */
6492static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev)
6493{
6494	unsigned long pool_dma;
6495
6496	pool_dma = (IBMVFC_MAX_SCSI_QUEUES * scsi_qdepth) * sizeof(union ibmvfc_iu);
6497	return pool_dma + ((512 * 1024) * driver_template.cmd_per_lun);
6498}
6499
6500static const struct vio_device_id ibmvfc_device_table[] = {
6501	{"fcp", "IBM,vfc-client"},
6502	{ "", "" }
6503};
6504MODULE_DEVICE_TABLE(vio, ibmvfc_device_table);
6505
6506static const struct dev_pm_ops ibmvfc_pm_ops = {
6507	.resume = ibmvfc_resume
6508};
6509
6510static struct vio_driver ibmvfc_driver = {
6511	.id_table = ibmvfc_device_table,
6512	.probe = ibmvfc_probe,
6513	.remove = ibmvfc_remove,
6514	.get_desired_dma = ibmvfc_get_desired_dma,
6515	.name = IBMVFC_NAME,
6516	.pm = &ibmvfc_pm_ops,
6517};
6518
6519static struct fc_function_template ibmvfc_transport_functions = {
6520	.show_host_fabric_name = 1,
6521	.show_host_node_name = 1,
6522	.show_host_port_name = 1,
6523	.show_host_supported_classes = 1,
6524	.show_host_port_type = 1,
6525	.show_host_port_id = 1,
6526	.show_host_maxframe_size = 1,
6527
6528	.get_host_port_state = ibmvfc_get_host_port_state,
6529	.show_host_port_state = 1,
6530
6531	.get_host_speed = ibmvfc_get_host_speed,
6532	.show_host_speed = 1,
6533
6534	.issue_fc_host_lip = ibmvfc_issue_fc_host_lip,
6535	.terminate_rport_io = ibmvfc_terminate_rport_io,
6536
6537	.show_rport_maxframe_size = 1,
6538	.show_rport_supported_classes = 1,
6539
6540	.set_rport_dev_loss_tmo = ibmvfc_set_rport_dev_loss_tmo,
6541	.show_rport_dev_loss_tmo = 1,
6542
6543	.get_starget_node_name = ibmvfc_get_starget_node_name,
6544	.show_starget_node_name = 1,
6545
6546	.get_starget_port_name = ibmvfc_get_starget_port_name,
6547	.show_starget_port_name = 1,
6548
6549	.get_starget_port_id = ibmvfc_get_starget_port_id,
6550	.show_starget_port_id = 1,
6551
6552	.bsg_request = ibmvfc_bsg_request,
6553	.bsg_timeout = ibmvfc_bsg_timeout,
6554};
6555
6556/**
6557 * ibmvfc_module_init - Initialize the ibmvfc module
6558 *
6559 * Return value:
6560 * 	0 on success / other on failure
6561 **/
6562static int __init ibmvfc_module_init(void)
6563{
6564	int rc;
6565
6566	if (!firmware_has_feature(FW_FEATURE_VIO))
6567		return -ENODEV;
6568
6569	printk(KERN_INFO IBMVFC_NAME": IBM Virtual Fibre Channel Driver version: %s %s\n",
6570	       IBMVFC_DRIVER_VERSION, IBMVFC_DRIVER_DATE);
6571
6572	ibmvfc_transport_template = fc_attach_transport(&ibmvfc_transport_functions);
6573	if (!ibmvfc_transport_template)
6574		return -ENOMEM;
6575
6576	rc = vio_register_driver(&ibmvfc_driver);
6577	if (rc)
6578		fc_release_transport(ibmvfc_transport_template);
6579	return rc;
6580}
6581
6582/**
6583 * ibmvfc_module_exit - Teardown the ibmvfc module
6584 *
6585 * Return value:
6586 * 	nothing
6587 **/
6588static void __exit ibmvfc_module_exit(void)
6589{
6590	vio_unregister_driver(&ibmvfc_driver);
6591	fc_release_transport(ibmvfc_transport_template);
6592}
6593
6594module_init(ibmvfc_module_init);
6595module_exit(ibmvfc_module_exit);