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 35 static unsigned int init_timeout = IBMVFC_INIT_TIMEOUT; 36 static unsigned int default_timeout = IBMVFC_DEFAULT_TIMEOUT; 37 static u64 max_lun = IBMVFC_MAX_LUN; 38 static unsigned int max_targets = IBMVFC_MAX_TARGETS; 39 static unsigned int max_requests = IBMVFC_MAX_REQUESTS_DEFAULT; 40 static u16 max_sectors = IBMVFC_MAX_SECTORS; 41 static u16 scsi_qdepth = IBMVFC_SCSI_QDEPTH; 42 static unsigned int disc_threads = IBMVFC_MAX_DISC_THREADS; 43 static unsigned int ibmvfc_debug = IBMVFC_DEBUG; 44 static unsigned int log_level = IBMVFC_DEFAULT_LOG_LEVEL; 45 static unsigned int cls3_error = IBMVFC_CLS3_ERROR; 46 static unsigned int mq_enabled = IBMVFC_MQ; 47 static unsigned int nr_scsi_hw_queues = IBMVFC_SCSI_HW_QUEUES; 48 static unsigned int nr_scsi_channels = IBMVFC_SCSI_CHANNELS; 49 static unsigned int mig_channels_only = IBMVFC_MIG_NO_SUB_TO_CRQ; 50 static unsigned int mig_no_less_channels = IBMVFC_MIG_NO_N_TO_M; 51 52 static LIST_HEAD(ibmvfc_head); 53 static DEFINE_SPINLOCK(ibmvfc_driver_lock); 54 static struct scsi_transport_template *ibmvfc_transport_template; 55 56 MODULE_DESCRIPTION("IBM Virtual Fibre Channel Driver"); 57 MODULE_AUTHOR("Brian King <brking@linux.vnet.ibm.com>"); 58 MODULE_LICENSE("GPL"); 59 MODULE_VERSION(IBMVFC_DRIVER_VERSION); 60 61 module_param_named(mq, mq_enabled, uint, S_IRUGO); 62 MODULE_PARM_DESC(mq, "Enable multiqueue support. " 63 "[Default=" __stringify(IBMVFC_MQ) "]"); 64 module_param_named(scsi_host_queues, nr_scsi_hw_queues, uint, S_IRUGO); 65 MODULE_PARM_DESC(scsi_host_queues, "Number of SCSI Host submission queues. " 66 "[Default=" __stringify(IBMVFC_SCSI_HW_QUEUES) "]"); 67 module_param_named(scsi_hw_channels, nr_scsi_channels, uint, S_IRUGO); 68 MODULE_PARM_DESC(scsi_hw_channels, "Number of hw scsi channels to request. " 69 "[Default=" __stringify(IBMVFC_SCSI_CHANNELS) "]"); 70 module_param_named(mig_channels_only, mig_channels_only, uint, S_IRUGO); 71 MODULE_PARM_DESC(mig_channels_only, "Prevent migration to non-channelized system. " 72 "[Default=" __stringify(IBMVFC_MIG_NO_SUB_TO_CRQ) "]"); 73 module_param_named(mig_no_less_channels, mig_no_less_channels, uint, S_IRUGO); 74 MODULE_PARM_DESC(mig_no_less_channels, "Prevent migration to system with less channels. " 75 "[Default=" __stringify(IBMVFC_MIG_NO_N_TO_M) "]"); 76 77 module_param_named(init_timeout, init_timeout, uint, S_IRUGO | S_IWUSR); 78 MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds. " 79 "[Default=" __stringify(IBMVFC_INIT_TIMEOUT) "]"); 80 module_param_named(default_timeout, default_timeout, uint, S_IRUGO | S_IWUSR); 81 MODULE_PARM_DESC(default_timeout, 82 "Default timeout in seconds for initialization and EH commands. " 83 "[Default=" __stringify(IBMVFC_DEFAULT_TIMEOUT) "]"); 84 module_param_named(max_requests, max_requests, uint, S_IRUGO); 85 MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter. " 86 "[Default=" __stringify(IBMVFC_MAX_REQUESTS_DEFAULT) "]"); 87 module_param_named(max_sectors, max_sectors, ushort, S_IRUGO); 88 MODULE_PARM_DESC(max_sectors, "Maximum sectors for this adapter. " 89 "[Default=" __stringify(IBMVFC_MAX_SECTORS) "]"); 90 module_param_named(scsi_qdepth, scsi_qdepth, ushort, S_IRUGO); 91 MODULE_PARM_DESC(scsi_qdepth, "Maximum scsi command depth per adapter queue. " 92 "[Default=" __stringify(IBMVFC_SCSI_QDEPTH) "]"); 93 module_param_named(max_lun, max_lun, ullong, S_IRUGO); 94 MODULE_PARM_DESC(max_lun, "Maximum allowed LUN. " 95 "[Default=" __stringify(IBMVFC_MAX_LUN) "]"); 96 module_param_named(max_targets, max_targets, uint, S_IRUGO); 97 MODULE_PARM_DESC(max_targets, "Maximum allowed targets. " 98 "[Default=" __stringify(IBMVFC_MAX_TARGETS) "]"); 99 module_param_named(disc_threads, disc_threads, uint, S_IRUGO); 100 MODULE_PARM_DESC(disc_threads, "Number of device discovery threads to use. " 101 "[Default=" __stringify(IBMVFC_MAX_DISC_THREADS) "]"); 102 module_param_named(debug, ibmvfc_debug, uint, S_IRUGO | S_IWUSR); 103 MODULE_PARM_DESC(debug, "Enable driver debug information. " 104 "[Default=" __stringify(IBMVFC_DEBUG) "]"); 105 module_param_named(log_level, log_level, uint, 0); 106 MODULE_PARM_DESC(log_level, "Set to 0 - 4 for increasing verbosity of device driver. " 107 "[Default=" __stringify(IBMVFC_DEFAULT_LOG_LEVEL) "]"); 108 module_param_named(cls3_error, cls3_error, uint, 0); 109 MODULE_PARM_DESC(cls3_error, "Enable FC Class 3 Error Recovery. " 110 "[Default=" __stringify(IBMVFC_CLS3_ERROR) "]"); 111 112 static const struct { 113 u16 status; 114 u16 error; 115 u8 result; 116 u8 retry; 117 int log; 118 char *name; 119 } cmd_status [] = { 120 { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_ESTABLISH, DID_ERROR, 1, 1, "unable to establish" }, 121 { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_FAULT, DID_OK, 1, 0, "transport fault" }, 122 { IBMVFC_FABRIC_MAPPED, IBMVFC_CMD_TIMEOUT, DID_TIME_OUT, 1, 1, "command timeout" }, 123 { IBMVFC_FABRIC_MAPPED, IBMVFC_ENETDOWN, DID_TRANSPORT_DISRUPTED, 1, 1, "network down" }, 124 { IBMVFC_FABRIC_MAPPED, IBMVFC_HW_FAILURE, DID_ERROR, 1, 1, "hardware failure" }, 125 { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DOWN_ERR, DID_REQUEUE, 0, 0, "link down" }, 126 { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DEAD_ERR, DID_ERROR, 0, 0, "link dead" }, 127 { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_REGISTER, DID_ERROR, 1, 1, "unable to register" }, 128 { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_BUSY, DID_BUS_BUSY, 1, 0, "transport busy" }, 129 { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_DEAD, DID_ERROR, 0, 1, "transport dead" }, 130 { IBMVFC_FABRIC_MAPPED, IBMVFC_CONFIG_ERROR, DID_ERROR, 1, 1, "configuration error" }, 131 { IBMVFC_FABRIC_MAPPED, IBMVFC_NAME_SERVER_FAIL, DID_ERROR, 1, 1, "name server failure" }, 132 { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_HALTED, DID_REQUEUE, 1, 0, "link halted" }, 133 { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_GENERAL, DID_OK, 1, 0, "general transport error" }, 134 135 { IBMVFC_VIOS_FAILURE, IBMVFC_CRQ_FAILURE, DID_REQUEUE, 1, 1, "CRQ failure" }, 136 { IBMVFC_VIOS_FAILURE, IBMVFC_SW_FAILURE, DID_ERROR, 0, 1, "software failure" }, 137 { IBMVFC_VIOS_FAILURE, IBMVFC_INVALID_PARAMETER, DID_ERROR, 0, 1, "invalid parameter" }, 138 { IBMVFC_VIOS_FAILURE, IBMVFC_MISSING_PARAMETER, DID_ERROR, 0, 1, "missing parameter" }, 139 { IBMVFC_VIOS_FAILURE, IBMVFC_HOST_IO_BUS, DID_ERROR, 1, 1, "host I/O bus failure" }, 140 { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED, DID_ERROR, 0, 1, "transaction cancelled" }, 141 { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED_IMPLICIT, DID_ERROR, 0, 1, "transaction cancelled implicit" }, 142 { IBMVFC_VIOS_FAILURE, IBMVFC_INSUFFICIENT_RESOURCE, DID_REQUEUE, 1, 1, "insufficient resources" }, 143 { IBMVFC_VIOS_FAILURE, IBMVFC_PLOGI_REQUIRED, DID_ERROR, 0, 1, "port login required" }, 144 { IBMVFC_VIOS_FAILURE, IBMVFC_COMMAND_FAILED, DID_ERROR, 1, 1, "command failed" }, 145 146 { IBMVFC_FC_FAILURE, IBMVFC_INVALID_ELS_CMD_CODE, DID_ERROR, 0, 1, "invalid ELS command code" }, 147 { IBMVFC_FC_FAILURE, IBMVFC_INVALID_VERSION, DID_ERROR, 0, 1, "invalid version level" }, 148 { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_ERROR, DID_ERROR, 1, 1, "logical error" }, 149 { IBMVFC_FC_FAILURE, IBMVFC_INVALID_CT_IU_SIZE, DID_ERROR, 0, 1, "invalid CT_IU size" }, 150 { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_BUSY, DID_REQUEUE, 1, 0, "logical busy" }, 151 { IBMVFC_FC_FAILURE, IBMVFC_PROTOCOL_ERROR, DID_ERROR, 1, 1, "protocol error" }, 152 { IBMVFC_FC_FAILURE, IBMVFC_UNABLE_TO_PERFORM_REQ, DID_ERROR, 1, 1, "unable to perform request" }, 153 { IBMVFC_FC_FAILURE, IBMVFC_CMD_NOT_SUPPORTED, DID_ERROR, 0, 0, "command not supported" }, 154 { IBMVFC_FC_FAILURE, IBMVFC_SERVER_NOT_AVAIL, DID_ERROR, 0, 1, "server not available" }, 155 { IBMVFC_FC_FAILURE, IBMVFC_CMD_IN_PROGRESS, DID_ERROR, 0, 1, "command already in progress" }, 156 { IBMVFC_FC_FAILURE, IBMVFC_VENDOR_SPECIFIC, DID_ERROR, 1, 1, "vendor specific" }, 157 158 { IBMVFC_FC_SCSI_ERROR, 0, DID_OK, 1, 0, "SCSI error" }, 159 { IBMVFC_FC_SCSI_ERROR, IBMVFC_COMMAND_FAILED, DID_ERROR, 0, 1, "PRLI to device failed." }, 160 }; 161 162 static void ibmvfc_npiv_login(struct ibmvfc_host *); 163 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *); 164 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *); 165 static void ibmvfc_tgt_query_target(struct ibmvfc_target *); 166 static void ibmvfc_npiv_logout(struct ibmvfc_host *); 167 static void ibmvfc_tgt_implicit_logout_and_del(struct ibmvfc_target *); 168 static void ibmvfc_tgt_move_login(struct ibmvfc_target *); 169 170 static void ibmvfc_dereg_sub_crqs(struct ibmvfc_host *, struct ibmvfc_channels *); 171 static void ibmvfc_reg_sub_crqs(struct ibmvfc_host *, struct ibmvfc_channels *); 172 173 static const char *unknown_error = "unknown error"; 174 175 static long h_reg_sub_crq(unsigned long unit_address, unsigned long ioba, 176 unsigned long length, unsigned long *cookie, 177 unsigned long *irq) 178 { 179 unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; 180 long rc; 181 182 rc = plpar_hcall(H_REG_SUB_CRQ, retbuf, unit_address, ioba, length); 183 *cookie = retbuf[0]; 184 *irq = retbuf[1]; 185 186 return rc; 187 } 188 189 static int ibmvfc_check_caps(struct ibmvfc_host *vhost, unsigned long cap_flags) 190 { 191 u64 host_caps = be64_to_cpu(vhost->login_buf->resp.capabilities); 192 193 return (host_caps & cap_flags) ? 1 : 0; 194 } 195 196 static struct ibmvfc_fcp_cmd_iu *ibmvfc_get_fcp_iu(struct ibmvfc_host *vhost, 197 struct ibmvfc_cmd *vfc_cmd) 198 { 199 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) 200 return &vfc_cmd->v2.iu; 201 else 202 return &vfc_cmd->v1.iu; 203 } 204 205 static struct ibmvfc_fcp_rsp *ibmvfc_get_fcp_rsp(struct ibmvfc_host *vhost, 206 struct ibmvfc_cmd *vfc_cmd) 207 { 208 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) 209 return &vfc_cmd->v2.rsp; 210 else 211 return &vfc_cmd->v1.rsp; 212 } 213 214 #ifdef CONFIG_SCSI_IBMVFC_TRACE 215 /** 216 * ibmvfc_trc_start - Log a start trace entry 217 * @evt: ibmvfc event struct 218 * 219 **/ 220 static void ibmvfc_trc_start(struct ibmvfc_event *evt) 221 { 222 struct ibmvfc_host *vhost = evt->vhost; 223 struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd; 224 struct ibmvfc_mad_common *mad = &evt->iu.mad_common; 225 struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd); 226 struct ibmvfc_trace_entry *entry; 227 int index = atomic_inc_return(&vhost->trace_index) & IBMVFC_TRACE_INDEX_MASK; 228 229 entry = &vhost->trace[index]; 230 entry->evt = evt; 231 entry->time = jiffies; 232 entry->fmt = evt->crq.format; 233 entry->type = IBMVFC_TRC_START; 234 235 switch (entry->fmt) { 236 case IBMVFC_CMD_FORMAT: 237 entry->op_code = iu->cdb[0]; 238 entry->scsi_id = be64_to_cpu(vfc_cmd->tgt_scsi_id); 239 entry->lun = scsilun_to_int(&iu->lun); 240 entry->tmf_flags = iu->tmf_flags; 241 entry->u.start.xfer_len = be32_to_cpu(iu->xfer_len); 242 break; 243 case IBMVFC_MAD_FORMAT: 244 entry->op_code = be32_to_cpu(mad->opcode); 245 break; 246 default: 247 break; 248 } 249 } 250 251 /** 252 * ibmvfc_trc_end - Log an end trace entry 253 * @evt: ibmvfc event struct 254 * 255 **/ 256 static void ibmvfc_trc_end(struct ibmvfc_event *evt) 257 { 258 struct ibmvfc_host *vhost = evt->vhost; 259 struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd; 260 struct ibmvfc_mad_common *mad = &evt->xfer_iu->mad_common; 261 struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd); 262 struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd); 263 struct ibmvfc_trace_entry *entry; 264 int index = atomic_inc_return(&vhost->trace_index) & IBMVFC_TRACE_INDEX_MASK; 265 266 entry = &vhost->trace[index]; 267 entry->evt = evt; 268 entry->time = jiffies; 269 entry->fmt = evt->crq.format; 270 entry->type = IBMVFC_TRC_END; 271 272 switch (entry->fmt) { 273 case IBMVFC_CMD_FORMAT: 274 entry->op_code = iu->cdb[0]; 275 entry->scsi_id = be64_to_cpu(vfc_cmd->tgt_scsi_id); 276 entry->lun = scsilun_to_int(&iu->lun); 277 entry->tmf_flags = iu->tmf_flags; 278 entry->u.end.status = be16_to_cpu(vfc_cmd->status); 279 entry->u.end.error = be16_to_cpu(vfc_cmd->error); 280 entry->u.end.fcp_rsp_flags = rsp->flags; 281 entry->u.end.rsp_code = rsp->data.info.rsp_code; 282 entry->u.end.scsi_status = rsp->scsi_status; 283 break; 284 case IBMVFC_MAD_FORMAT: 285 entry->op_code = be32_to_cpu(mad->opcode); 286 entry->u.end.status = be16_to_cpu(mad->status); 287 break; 288 default: 289 break; 290 291 } 292 } 293 294 #else 295 #define ibmvfc_trc_start(evt) do { } while (0) 296 #define ibmvfc_trc_end(evt) do { } while (0) 297 #endif 298 299 /** 300 * ibmvfc_get_err_index - Find the index into cmd_status for the fcp response 301 * @status: status / error class 302 * @error: error 303 * 304 * Return value: 305 * index into cmd_status / -EINVAL on failure 306 **/ 307 static int ibmvfc_get_err_index(u16 status, u16 error) 308 { 309 int i; 310 311 for (i = 0; i < ARRAY_SIZE(cmd_status); i++) 312 if ((cmd_status[i].status & status) == cmd_status[i].status && 313 cmd_status[i].error == error) 314 return i; 315 316 return -EINVAL; 317 } 318 319 /** 320 * ibmvfc_get_cmd_error - Find the error description for the fcp response 321 * @status: status / error class 322 * @error: error 323 * 324 * Return value: 325 * error description string 326 **/ 327 static const char *ibmvfc_get_cmd_error(u16 status, u16 error) 328 { 329 int rc = ibmvfc_get_err_index(status, error); 330 if (rc >= 0) 331 return cmd_status[rc].name; 332 return unknown_error; 333 } 334 335 /** 336 * ibmvfc_get_err_result - Find the scsi status to return for the fcp response 337 * @vhost: ibmvfc host struct 338 * @vfc_cmd: ibmvfc command struct 339 * 340 * Return value: 341 * SCSI result value to return for completed command 342 **/ 343 static int ibmvfc_get_err_result(struct ibmvfc_host *vhost, struct ibmvfc_cmd *vfc_cmd) 344 { 345 int err; 346 struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd); 347 int fc_rsp_len = be32_to_cpu(rsp->fcp_rsp_len); 348 349 if ((rsp->flags & FCP_RSP_LEN_VALID) && 350 ((fc_rsp_len && fc_rsp_len != 4 && fc_rsp_len != 8) || 351 rsp->data.info.rsp_code)) 352 return DID_ERROR << 16; 353 354 err = ibmvfc_get_err_index(be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error)); 355 if (err >= 0) 356 return rsp->scsi_status | (cmd_status[err].result << 16); 357 return rsp->scsi_status | (DID_ERROR << 16); 358 } 359 360 /** 361 * ibmvfc_retry_cmd - Determine if error status is retryable 362 * @status: status / error class 363 * @error: error 364 * 365 * Return value: 366 * 1 if error should be retried / 0 if it should not 367 **/ 368 static int ibmvfc_retry_cmd(u16 status, u16 error) 369 { 370 int rc = ibmvfc_get_err_index(status, error); 371 372 if (rc >= 0) 373 return cmd_status[rc].retry; 374 return 1; 375 } 376 377 static const char *unknown_fc_explain = "unknown fc explain"; 378 379 static const struct { 380 u16 fc_explain; 381 char *name; 382 } ls_explain [] = { 383 { 0x00, "no additional explanation" }, 384 { 0x01, "service parameter error - options" }, 385 { 0x03, "service parameter error - initiator control" }, 386 { 0x05, "service parameter error - recipient control" }, 387 { 0x07, "service parameter error - received data field size" }, 388 { 0x09, "service parameter error - concurrent seq" }, 389 { 0x0B, "service parameter error - credit" }, 390 { 0x0D, "invalid N_Port/F_Port_Name" }, 391 { 0x0E, "invalid node/Fabric Name" }, 392 { 0x0F, "invalid common service parameters" }, 393 { 0x11, "invalid association header" }, 394 { 0x13, "association header required" }, 395 { 0x15, "invalid originator S_ID" }, 396 { 0x17, "invalid OX_ID-RX-ID combination" }, 397 { 0x19, "command (request) already in progress" }, 398 { 0x1E, "N_Port Login requested" }, 399 { 0x1F, "Invalid N_Port_ID" }, 400 }; 401 402 static const struct { 403 u16 fc_explain; 404 char *name; 405 } gs_explain [] = { 406 { 0x00, "no additional explanation" }, 407 { 0x01, "port identifier not registered" }, 408 { 0x02, "port name not registered" }, 409 { 0x03, "node name not registered" }, 410 { 0x04, "class of service not registered" }, 411 { 0x06, "initial process associator not registered" }, 412 { 0x07, "FC-4 TYPEs not registered" }, 413 { 0x08, "symbolic port name not registered" }, 414 { 0x09, "symbolic node name not registered" }, 415 { 0x0A, "port type not registered" }, 416 { 0xF0, "authorization exception" }, 417 { 0xF1, "authentication exception" }, 418 { 0xF2, "data base full" }, 419 { 0xF3, "data base empty" }, 420 { 0xF4, "processing request" }, 421 { 0xF5, "unable to verify connection" }, 422 { 0xF6, "devices not in a common zone" }, 423 }; 424 425 /** 426 * ibmvfc_get_ls_explain - Return the FC Explain description text 427 * @status: FC Explain status 428 * 429 * Returns: 430 * error string 431 **/ 432 static const char *ibmvfc_get_ls_explain(u16 status) 433 { 434 int i; 435 436 for (i = 0; i < ARRAY_SIZE(ls_explain); i++) 437 if (ls_explain[i].fc_explain == status) 438 return ls_explain[i].name; 439 440 return unknown_fc_explain; 441 } 442 443 /** 444 * ibmvfc_get_gs_explain - Return the FC Explain description text 445 * @status: FC Explain status 446 * 447 * Returns: 448 * error string 449 **/ 450 static const char *ibmvfc_get_gs_explain(u16 status) 451 { 452 int i; 453 454 for (i = 0; i < ARRAY_SIZE(gs_explain); i++) 455 if (gs_explain[i].fc_explain == status) 456 return gs_explain[i].name; 457 458 return unknown_fc_explain; 459 } 460 461 static const struct { 462 enum ibmvfc_fc_type fc_type; 463 char *name; 464 } fc_type [] = { 465 { IBMVFC_FABRIC_REJECT, "fabric reject" }, 466 { IBMVFC_PORT_REJECT, "port reject" }, 467 { IBMVFC_LS_REJECT, "ELS reject" }, 468 { IBMVFC_FABRIC_BUSY, "fabric busy" }, 469 { IBMVFC_PORT_BUSY, "port busy" }, 470 { IBMVFC_BASIC_REJECT, "basic reject" }, 471 }; 472 473 static const char *unknown_fc_type = "unknown fc type"; 474 475 /** 476 * ibmvfc_get_fc_type - Return the FC Type description text 477 * @status: FC Type error status 478 * 479 * Returns: 480 * error string 481 **/ 482 static const char *ibmvfc_get_fc_type(u16 status) 483 { 484 int i; 485 486 for (i = 0; i < ARRAY_SIZE(fc_type); i++) 487 if (fc_type[i].fc_type == status) 488 return fc_type[i].name; 489 490 return unknown_fc_type; 491 } 492 493 /** 494 * ibmvfc_set_tgt_action - Set the next init action for the target 495 * @tgt: ibmvfc target struct 496 * @action: action to perform 497 * 498 * Returns: 499 * 0 if action changed / non-zero if not changed 500 **/ 501 static int ibmvfc_set_tgt_action(struct ibmvfc_target *tgt, 502 enum ibmvfc_target_action action) 503 { 504 int rc = -EINVAL; 505 506 switch (tgt->action) { 507 case IBMVFC_TGT_ACTION_LOGOUT_RPORT: 508 if (action == IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT || 509 action == IBMVFC_TGT_ACTION_DEL_RPORT) { 510 tgt->action = action; 511 rc = 0; 512 } 513 break; 514 case IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT: 515 if (action == IBMVFC_TGT_ACTION_DEL_RPORT || 516 action == IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT) { 517 tgt->action = action; 518 rc = 0; 519 } 520 break; 521 case IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT: 522 if (action == IBMVFC_TGT_ACTION_LOGOUT_RPORT) { 523 tgt->action = action; 524 rc = 0; 525 } 526 break; 527 case IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT: 528 if (action == IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT) { 529 tgt->action = action; 530 rc = 0; 531 } 532 break; 533 case IBMVFC_TGT_ACTION_DEL_RPORT: 534 if (action == IBMVFC_TGT_ACTION_DELETED_RPORT) { 535 tgt->action = action; 536 rc = 0; 537 } 538 break; 539 case IBMVFC_TGT_ACTION_DELETED_RPORT: 540 break; 541 default: 542 tgt->action = action; 543 rc = 0; 544 break; 545 } 546 547 if (action >= IBMVFC_TGT_ACTION_LOGOUT_RPORT) 548 tgt->add_rport = 0; 549 550 return rc; 551 } 552 553 /** 554 * ibmvfc_set_host_state - Set the state for the host 555 * @vhost: ibmvfc host struct 556 * @state: state to set host to 557 * 558 * Returns: 559 * 0 if state changed / non-zero if not changed 560 **/ 561 static int ibmvfc_set_host_state(struct ibmvfc_host *vhost, 562 enum ibmvfc_host_state state) 563 { 564 int rc = 0; 565 566 switch (vhost->state) { 567 case IBMVFC_HOST_OFFLINE: 568 rc = -EINVAL; 569 break; 570 default: 571 vhost->state = state; 572 break; 573 } 574 575 return rc; 576 } 577 578 /** 579 * ibmvfc_set_host_action - Set the next init action for the host 580 * @vhost: ibmvfc host struct 581 * @action: action to perform 582 * 583 **/ 584 static void ibmvfc_set_host_action(struct ibmvfc_host *vhost, 585 enum ibmvfc_host_action action) 586 { 587 switch (action) { 588 case IBMVFC_HOST_ACTION_ALLOC_TGTS: 589 if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) 590 vhost->action = action; 591 break; 592 case IBMVFC_HOST_ACTION_LOGO_WAIT: 593 if (vhost->action == IBMVFC_HOST_ACTION_LOGO) 594 vhost->action = action; 595 break; 596 case IBMVFC_HOST_ACTION_INIT_WAIT: 597 if (vhost->action == IBMVFC_HOST_ACTION_INIT) 598 vhost->action = action; 599 break; 600 case IBMVFC_HOST_ACTION_QUERY: 601 switch (vhost->action) { 602 case IBMVFC_HOST_ACTION_INIT_WAIT: 603 case IBMVFC_HOST_ACTION_NONE: 604 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED: 605 vhost->action = action; 606 break; 607 default: 608 break; 609 } 610 break; 611 case IBMVFC_HOST_ACTION_TGT_INIT: 612 if (vhost->action == IBMVFC_HOST_ACTION_ALLOC_TGTS) 613 vhost->action = action; 614 break; 615 case IBMVFC_HOST_ACTION_REENABLE: 616 case IBMVFC_HOST_ACTION_RESET: 617 vhost->action = action; 618 break; 619 case IBMVFC_HOST_ACTION_INIT: 620 case IBMVFC_HOST_ACTION_TGT_DEL: 621 case IBMVFC_HOST_ACTION_LOGO: 622 case IBMVFC_HOST_ACTION_QUERY_TGTS: 623 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED: 624 case IBMVFC_HOST_ACTION_NONE: 625 default: 626 switch (vhost->action) { 627 case IBMVFC_HOST_ACTION_RESET: 628 case IBMVFC_HOST_ACTION_REENABLE: 629 break; 630 default: 631 vhost->action = action; 632 break; 633 } 634 break; 635 } 636 } 637 638 /** 639 * ibmvfc_reinit_host - Re-start host initialization (no NPIV Login) 640 * @vhost: ibmvfc host struct 641 * 642 * Return value: 643 * nothing 644 **/ 645 static void ibmvfc_reinit_host(struct ibmvfc_host *vhost) 646 { 647 if (vhost->action == IBMVFC_HOST_ACTION_NONE && 648 vhost->state == IBMVFC_ACTIVE) { 649 if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) { 650 scsi_block_requests(vhost->host); 651 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY); 652 } 653 } else 654 vhost->reinit = 1; 655 656 wake_up(&vhost->work_wait_q); 657 } 658 659 /** 660 * ibmvfc_del_tgt - Schedule cleanup and removal of the target 661 * @tgt: ibmvfc target struct 662 **/ 663 static void ibmvfc_del_tgt(struct ibmvfc_target *tgt) 664 { 665 if (!ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_LOGOUT_RPORT)) { 666 tgt->job_step = ibmvfc_tgt_implicit_logout_and_del; 667 tgt->init_retries = 0; 668 } 669 wake_up(&tgt->vhost->work_wait_q); 670 } 671 672 /** 673 * ibmvfc_link_down - Handle a link down event from the adapter 674 * @vhost: ibmvfc host struct 675 * @state: ibmvfc host state to enter 676 * 677 **/ 678 static void ibmvfc_link_down(struct ibmvfc_host *vhost, 679 enum ibmvfc_host_state state) 680 { 681 struct ibmvfc_target *tgt; 682 683 ENTER; 684 scsi_block_requests(vhost->host); 685 list_for_each_entry(tgt, &vhost->targets, queue) 686 ibmvfc_del_tgt(tgt); 687 ibmvfc_set_host_state(vhost, state); 688 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL); 689 vhost->events_to_log |= IBMVFC_AE_LINKDOWN; 690 wake_up(&vhost->work_wait_q); 691 LEAVE; 692 } 693 694 /** 695 * ibmvfc_init_host - Start host initialization 696 * @vhost: ibmvfc host struct 697 * 698 * Return value: 699 * nothing 700 **/ 701 static void ibmvfc_init_host(struct ibmvfc_host *vhost) 702 { 703 struct ibmvfc_target *tgt; 704 705 if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) { 706 if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) { 707 dev_err(vhost->dev, 708 "Host initialization retries exceeded. Taking adapter offline\n"); 709 ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE); 710 return; 711 } 712 } 713 714 if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) { 715 memset(vhost->async_crq.msgs.async, 0, PAGE_SIZE); 716 vhost->async_crq.cur = 0; 717 718 list_for_each_entry(tgt, &vhost->targets, queue) { 719 if (vhost->client_migrated) 720 tgt->need_login = 1; 721 else 722 ibmvfc_del_tgt(tgt); 723 } 724 725 scsi_block_requests(vhost->host); 726 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT); 727 vhost->job_step = ibmvfc_npiv_login; 728 wake_up(&vhost->work_wait_q); 729 } 730 } 731 732 /** 733 * ibmvfc_send_crq - Send a CRQ 734 * @vhost: ibmvfc host struct 735 * @word1: the first 64 bits of the data 736 * @word2: the second 64 bits of the data 737 * 738 * Return value: 739 * 0 on success / other on failure 740 **/ 741 static int ibmvfc_send_crq(struct ibmvfc_host *vhost, u64 word1, u64 word2) 742 { 743 struct vio_dev *vdev = to_vio_dev(vhost->dev); 744 return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2); 745 } 746 747 static int ibmvfc_send_sub_crq(struct ibmvfc_host *vhost, u64 cookie, u64 word1, 748 u64 word2, u64 word3, u64 word4) 749 { 750 struct vio_dev *vdev = to_vio_dev(vhost->dev); 751 752 return plpar_hcall_norets(H_SEND_SUB_CRQ, vdev->unit_address, cookie, 753 word1, word2, word3, word4); 754 } 755 756 /** 757 * ibmvfc_send_crq_init - Send a CRQ init message 758 * @vhost: ibmvfc host struct 759 * 760 * Return value: 761 * 0 on success / other on failure 762 **/ 763 static int ibmvfc_send_crq_init(struct ibmvfc_host *vhost) 764 { 765 ibmvfc_dbg(vhost, "Sending CRQ init\n"); 766 return ibmvfc_send_crq(vhost, 0xC001000000000000LL, 0); 767 } 768 769 /** 770 * ibmvfc_send_crq_init_complete - Send a CRQ init complete message 771 * @vhost: ibmvfc host struct 772 * 773 * Return value: 774 * 0 on success / other on failure 775 **/ 776 static int ibmvfc_send_crq_init_complete(struct ibmvfc_host *vhost) 777 { 778 ibmvfc_dbg(vhost, "Sending CRQ init complete\n"); 779 return ibmvfc_send_crq(vhost, 0xC002000000000000LL, 0); 780 } 781 782 /** 783 * ibmvfc_init_event_pool - Allocates and initializes the event pool for a host 784 * @vhost: ibmvfc host who owns the event pool 785 * @queue: ibmvfc queue struct 786 * 787 * Returns zero on success. 788 **/ 789 static int ibmvfc_init_event_pool(struct ibmvfc_host *vhost, 790 struct ibmvfc_queue *queue) 791 { 792 int i; 793 struct ibmvfc_event_pool *pool = &queue->evt_pool; 794 795 ENTER; 796 if (!queue->total_depth) 797 return 0; 798 799 pool->size = queue->total_depth; 800 pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL); 801 if (!pool->events) 802 return -ENOMEM; 803 804 pool->iu_storage = dma_alloc_coherent(vhost->dev, 805 pool->size * sizeof(*pool->iu_storage), 806 &pool->iu_token, 0); 807 808 if (!pool->iu_storage) { 809 kfree(pool->events); 810 return -ENOMEM; 811 } 812 813 INIT_LIST_HEAD(&queue->sent); 814 INIT_LIST_HEAD(&queue->free); 815 queue->evt_free = queue->evt_depth; 816 queue->reserved_free = queue->reserved_depth; 817 spin_lock_init(&queue->l_lock); 818 819 for (i = 0; i < pool->size; ++i) { 820 struct ibmvfc_event *evt = &pool->events[i]; 821 822 /* 823 * evt->active states 824 * 1 = in flight 825 * 0 = being completed 826 * -1 = free/freed 827 */ 828 atomic_set(&evt->active, -1); 829 atomic_set(&evt->free, 1); 830 evt->crq.valid = 0x80; 831 evt->crq.ioba = cpu_to_be64(pool->iu_token + (sizeof(*evt->xfer_iu) * i)); 832 evt->xfer_iu = pool->iu_storage + i; 833 evt->vhost = vhost; 834 evt->queue = queue; 835 evt->ext_list = NULL; 836 list_add_tail(&evt->queue_list, &queue->free); 837 } 838 839 LEAVE; 840 return 0; 841 } 842 843 /** 844 * ibmvfc_free_event_pool - Frees memory of the event pool of a host 845 * @vhost: ibmvfc host who owns the event pool 846 * @queue: ibmvfc queue struct 847 * 848 **/ 849 static void ibmvfc_free_event_pool(struct ibmvfc_host *vhost, 850 struct ibmvfc_queue *queue) 851 { 852 int i; 853 struct ibmvfc_event_pool *pool = &queue->evt_pool; 854 855 ENTER; 856 for (i = 0; i < pool->size; ++i) { 857 list_del(&pool->events[i].queue_list); 858 BUG_ON(atomic_read(&pool->events[i].free) != 1); 859 if (pool->events[i].ext_list) 860 dma_pool_free(vhost->sg_pool, 861 pool->events[i].ext_list, 862 pool->events[i].ext_list_token); 863 } 864 865 kfree(pool->events); 866 dma_free_coherent(vhost->dev, 867 pool->size * sizeof(*pool->iu_storage), 868 pool->iu_storage, pool->iu_token); 869 LEAVE; 870 } 871 872 /** 873 * ibmvfc_free_queue - Deallocate queue 874 * @vhost: ibmvfc host struct 875 * @queue: ibmvfc queue struct 876 * 877 * Unmaps dma and deallocates page for messages 878 **/ 879 static void ibmvfc_free_queue(struct ibmvfc_host *vhost, 880 struct ibmvfc_queue *queue) 881 { 882 struct device *dev = vhost->dev; 883 884 dma_unmap_single(dev, queue->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL); 885 free_page((unsigned long)queue->msgs.handle); 886 queue->msgs.handle = NULL; 887 888 ibmvfc_free_event_pool(vhost, queue); 889 } 890 891 /** 892 * ibmvfc_release_crq_queue - Deallocates data and unregisters CRQ 893 * @vhost: ibmvfc host struct 894 * 895 * Frees irq, deallocates a page for messages, unmaps dma, and unregisters 896 * the crq with the hypervisor. 897 **/ 898 static void ibmvfc_release_crq_queue(struct ibmvfc_host *vhost) 899 { 900 long rc = 0; 901 struct vio_dev *vdev = to_vio_dev(vhost->dev); 902 struct ibmvfc_queue *crq = &vhost->crq; 903 904 ibmvfc_dbg(vhost, "Releasing CRQ\n"); 905 free_irq(vdev->irq, vhost); 906 tasklet_kill(&vhost->tasklet); 907 do { 908 if (rc) 909 msleep(100); 910 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); 911 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc)); 912 913 vhost->state = IBMVFC_NO_CRQ; 914 vhost->logged_in = 0; 915 916 ibmvfc_free_queue(vhost, crq); 917 } 918 919 /** 920 * ibmvfc_reenable_crq_queue - reenables the CRQ 921 * @vhost: ibmvfc host struct 922 * 923 * Return value: 924 * 0 on success / other on failure 925 **/ 926 static int ibmvfc_reenable_crq_queue(struct ibmvfc_host *vhost) 927 { 928 int rc = 0; 929 struct vio_dev *vdev = to_vio_dev(vhost->dev); 930 unsigned long flags; 931 932 ibmvfc_dereg_sub_crqs(vhost, &vhost->scsi_scrqs); 933 934 /* Re-enable the CRQ */ 935 do { 936 if (rc) 937 msleep(100); 938 rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address); 939 } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc)); 940 941 if (rc) 942 dev_err(vhost->dev, "Error enabling adapter (rc=%d)\n", rc); 943 944 spin_lock_irqsave(vhost->host->host_lock, flags); 945 spin_lock(vhost->crq.q_lock); 946 vhost->do_enquiry = 1; 947 vhost->using_channels = 0; 948 spin_unlock(vhost->crq.q_lock); 949 spin_unlock_irqrestore(vhost->host->host_lock, flags); 950 951 ibmvfc_reg_sub_crqs(vhost, &vhost->scsi_scrqs); 952 953 return rc; 954 } 955 956 /** 957 * ibmvfc_reset_crq - resets a crq after a failure 958 * @vhost: ibmvfc host struct 959 * 960 * Return value: 961 * 0 on success / other on failure 962 **/ 963 static int ibmvfc_reset_crq(struct ibmvfc_host *vhost) 964 { 965 int rc = 0; 966 unsigned long flags; 967 struct vio_dev *vdev = to_vio_dev(vhost->dev); 968 struct ibmvfc_queue *crq = &vhost->crq; 969 970 ibmvfc_dereg_sub_crqs(vhost, &vhost->scsi_scrqs); 971 972 /* Close the CRQ */ 973 do { 974 if (rc) 975 msleep(100); 976 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); 977 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc)); 978 979 spin_lock_irqsave(vhost->host->host_lock, flags); 980 spin_lock(vhost->crq.q_lock); 981 vhost->state = IBMVFC_NO_CRQ; 982 vhost->logged_in = 0; 983 vhost->do_enquiry = 1; 984 vhost->using_channels = 0; 985 986 /* Clean out the queue */ 987 memset(crq->msgs.crq, 0, PAGE_SIZE); 988 crq->cur = 0; 989 990 /* And re-open it again */ 991 rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address, 992 crq->msg_token, PAGE_SIZE); 993 994 if (rc == H_CLOSED) 995 /* Adapter is good, but other end is not ready */ 996 dev_warn(vhost->dev, "Partner adapter not ready\n"); 997 else if (rc != 0) 998 dev_warn(vhost->dev, "Couldn't register crq (rc=%d)\n", rc); 999 1000 spin_unlock(vhost->crq.q_lock); 1001 spin_unlock_irqrestore(vhost->host->host_lock, flags); 1002 1003 ibmvfc_reg_sub_crqs(vhost, &vhost->scsi_scrqs); 1004 1005 return rc; 1006 } 1007 1008 /** 1009 * ibmvfc_valid_event - Determines if event is valid. 1010 * @pool: event_pool that contains the event 1011 * @evt: ibmvfc event to be checked for validity 1012 * 1013 * Return value: 1014 * 1 if event is valid / 0 if event is not valid 1015 **/ 1016 static int ibmvfc_valid_event(struct ibmvfc_event_pool *pool, 1017 struct ibmvfc_event *evt) 1018 { 1019 int index = evt - pool->events; 1020 if (index < 0 || index >= pool->size) /* outside of bounds */ 1021 return 0; 1022 if (evt != pool->events + index) /* unaligned */ 1023 return 0; 1024 return 1; 1025 } 1026 1027 /** 1028 * ibmvfc_free_event - Free the specified event 1029 * @evt: ibmvfc_event to be freed 1030 * 1031 **/ 1032 static void ibmvfc_free_event(struct ibmvfc_event *evt) 1033 { 1034 struct ibmvfc_event_pool *pool = &evt->queue->evt_pool; 1035 unsigned long flags; 1036 1037 BUG_ON(!ibmvfc_valid_event(pool, evt)); 1038 BUG_ON(atomic_inc_return(&evt->free) != 1); 1039 BUG_ON(atomic_dec_and_test(&evt->active)); 1040 1041 spin_lock_irqsave(&evt->queue->l_lock, flags); 1042 list_add_tail(&evt->queue_list, &evt->queue->free); 1043 if (evt->reserved) { 1044 evt->reserved = 0; 1045 evt->queue->reserved_free++; 1046 } else { 1047 evt->queue->evt_free++; 1048 } 1049 if (evt->eh_comp) 1050 complete(evt->eh_comp); 1051 spin_unlock_irqrestore(&evt->queue->l_lock, flags); 1052 } 1053 1054 /** 1055 * ibmvfc_scsi_eh_done - EH done function for queuecommand commands 1056 * @evt: ibmvfc event struct 1057 * 1058 * This function does not setup any error status, that must be done 1059 * before this function gets called. 1060 **/ 1061 static void ibmvfc_scsi_eh_done(struct ibmvfc_event *evt) 1062 { 1063 struct scsi_cmnd *cmnd = evt->cmnd; 1064 1065 if (cmnd) { 1066 scsi_dma_unmap(cmnd); 1067 scsi_done(cmnd); 1068 } 1069 1070 ibmvfc_free_event(evt); 1071 } 1072 1073 /** 1074 * ibmvfc_complete_purge - Complete failed command list 1075 * @purge_list: list head of failed commands 1076 * 1077 * This function runs completions on commands to fail as a result of a 1078 * host reset or platform migration. 1079 **/ 1080 static void ibmvfc_complete_purge(struct list_head *purge_list) 1081 { 1082 struct ibmvfc_event *evt, *pos; 1083 1084 list_for_each_entry_safe(evt, pos, purge_list, queue_list) { 1085 list_del(&evt->queue_list); 1086 ibmvfc_trc_end(evt); 1087 evt->done(evt); 1088 } 1089 } 1090 1091 /** 1092 * ibmvfc_fail_request - Fail request with specified error code 1093 * @evt: ibmvfc event struct 1094 * @error_code: error code to fail request with 1095 * 1096 * Return value: 1097 * none 1098 **/ 1099 static void ibmvfc_fail_request(struct ibmvfc_event *evt, int error_code) 1100 { 1101 /* 1102 * Anything we are failing should still be active. Otherwise, it 1103 * implies we already got a response for the command and are doing 1104 * something bad like double completing it. 1105 */ 1106 BUG_ON(!atomic_dec_and_test(&evt->active)); 1107 if (evt->cmnd) { 1108 evt->cmnd->result = (error_code << 16); 1109 evt->done = ibmvfc_scsi_eh_done; 1110 } else 1111 evt->xfer_iu->mad_common.status = cpu_to_be16(IBMVFC_MAD_DRIVER_FAILED); 1112 1113 del_timer(&evt->timer); 1114 } 1115 1116 /** 1117 * ibmvfc_purge_requests - Our virtual adapter just shut down. Purge any sent requests 1118 * @vhost: ibmvfc host struct 1119 * @error_code: error code to fail requests with 1120 * 1121 * Return value: 1122 * none 1123 **/ 1124 static void ibmvfc_purge_requests(struct ibmvfc_host *vhost, int error_code) 1125 { 1126 struct ibmvfc_event *evt, *pos; 1127 struct ibmvfc_queue *queues = vhost->scsi_scrqs.scrqs; 1128 unsigned long flags; 1129 int hwqs = 0; 1130 int i; 1131 1132 if (vhost->using_channels) 1133 hwqs = vhost->scsi_scrqs.active_queues; 1134 1135 ibmvfc_dbg(vhost, "Purging all requests\n"); 1136 spin_lock_irqsave(&vhost->crq.l_lock, flags); 1137 list_for_each_entry_safe(evt, pos, &vhost->crq.sent, queue_list) 1138 ibmvfc_fail_request(evt, error_code); 1139 list_splice_init(&vhost->crq.sent, &vhost->purge); 1140 spin_unlock_irqrestore(&vhost->crq.l_lock, flags); 1141 1142 for (i = 0; i < hwqs; i++) { 1143 spin_lock_irqsave(queues[i].q_lock, flags); 1144 spin_lock(&queues[i].l_lock); 1145 list_for_each_entry_safe(evt, pos, &queues[i].sent, queue_list) 1146 ibmvfc_fail_request(evt, error_code); 1147 list_splice_init(&queues[i].sent, &vhost->purge); 1148 spin_unlock(&queues[i].l_lock); 1149 spin_unlock_irqrestore(queues[i].q_lock, flags); 1150 } 1151 } 1152 1153 /** 1154 * ibmvfc_hard_reset_host - Reset the connection to the server by breaking the CRQ 1155 * @vhost: struct ibmvfc host to reset 1156 **/ 1157 static void ibmvfc_hard_reset_host(struct ibmvfc_host *vhost) 1158 { 1159 ibmvfc_purge_requests(vhost, DID_ERROR); 1160 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN); 1161 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET); 1162 } 1163 1164 /** 1165 * __ibmvfc_reset_host - Reset the connection to the server (no locking) 1166 * @vhost: struct ibmvfc host to reset 1167 **/ 1168 static void __ibmvfc_reset_host(struct ibmvfc_host *vhost) 1169 { 1170 if (vhost->logged_in && vhost->action != IBMVFC_HOST_ACTION_LOGO_WAIT && 1171 !ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) { 1172 scsi_block_requests(vhost->host); 1173 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO); 1174 vhost->job_step = ibmvfc_npiv_logout; 1175 wake_up(&vhost->work_wait_q); 1176 } else 1177 ibmvfc_hard_reset_host(vhost); 1178 } 1179 1180 /** 1181 * ibmvfc_reset_host - Reset the connection to the server 1182 * @vhost: ibmvfc host struct 1183 **/ 1184 static void ibmvfc_reset_host(struct ibmvfc_host *vhost) 1185 { 1186 unsigned long flags; 1187 1188 spin_lock_irqsave(vhost->host->host_lock, flags); 1189 __ibmvfc_reset_host(vhost); 1190 spin_unlock_irqrestore(vhost->host->host_lock, flags); 1191 } 1192 1193 /** 1194 * ibmvfc_retry_host_init - Retry host initialization if allowed 1195 * @vhost: ibmvfc host struct 1196 * 1197 * Returns: 1 if init will be retried / 0 if not 1198 * 1199 **/ 1200 static int ibmvfc_retry_host_init(struct ibmvfc_host *vhost) 1201 { 1202 int retry = 0; 1203 1204 if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) { 1205 vhost->delay_init = 1; 1206 if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) { 1207 dev_err(vhost->dev, 1208 "Host initialization retries exceeded. Taking adapter offline\n"); 1209 ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE); 1210 } else if (vhost->init_retries == IBMVFC_MAX_HOST_INIT_RETRIES) 1211 __ibmvfc_reset_host(vhost); 1212 else { 1213 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT); 1214 retry = 1; 1215 } 1216 } 1217 1218 wake_up(&vhost->work_wait_q); 1219 return retry; 1220 } 1221 1222 /** 1223 * __ibmvfc_get_target - Find the specified scsi_target (no locking) 1224 * @starget: scsi target struct 1225 * 1226 * Return value: 1227 * ibmvfc_target struct / NULL if not found 1228 **/ 1229 static struct ibmvfc_target *__ibmvfc_get_target(struct scsi_target *starget) 1230 { 1231 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 1232 struct ibmvfc_host *vhost = shost_priv(shost); 1233 struct ibmvfc_target *tgt; 1234 1235 list_for_each_entry(tgt, &vhost->targets, queue) 1236 if (tgt->target_id == starget->id) { 1237 kref_get(&tgt->kref); 1238 return tgt; 1239 } 1240 return NULL; 1241 } 1242 1243 /** 1244 * ibmvfc_get_target - Find the specified scsi_target 1245 * @starget: scsi target struct 1246 * 1247 * Return value: 1248 * ibmvfc_target struct / NULL if not found 1249 **/ 1250 static struct ibmvfc_target *ibmvfc_get_target(struct scsi_target *starget) 1251 { 1252 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 1253 struct ibmvfc_target *tgt; 1254 unsigned long flags; 1255 1256 spin_lock_irqsave(shost->host_lock, flags); 1257 tgt = __ibmvfc_get_target(starget); 1258 spin_unlock_irqrestore(shost->host_lock, flags); 1259 return tgt; 1260 } 1261 1262 /** 1263 * ibmvfc_get_host_speed - Get host port speed 1264 * @shost: scsi host struct 1265 * 1266 * Return value: 1267 * none 1268 **/ 1269 static void ibmvfc_get_host_speed(struct Scsi_Host *shost) 1270 { 1271 struct ibmvfc_host *vhost = shost_priv(shost); 1272 unsigned long flags; 1273 1274 spin_lock_irqsave(shost->host_lock, flags); 1275 if (vhost->state == IBMVFC_ACTIVE) { 1276 switch (be64_to_cpu(vhost->login_buf->resp.link_speed) / 100) { 1277 case 1: 1278 fc_host_speed(shost) = FC_PORTSPEED_1GBIT; 1279 break; 1280 case 2: 1281 fc_host_speed(shost) = FC_PORTSPEED_2GBIT; 1282 break; 1283 case 4: 1284 fc_host_speed(shost) = FC_PORTSPEED_4GBIT; 1285 break; 1286 case 8: 1287 fc_host_speed(shost) = FC_PORTSPEED_8GBIT; 1288 break; 1289 case 10: 1290 fc_host_speed(shost) = FC_PORTSPEED_10GBIT; 1291 break; 1292 case 16: 1293 fc_host_speed(shost) = FC_PORTSPEED_16GBIT; 1294 break; 1295 default: 1296 ibmvfc_log(vhost, 3, "Unknown port speed: %lld Gbit\n", 1297 be64_to_cpu(vhost->login_buf->resp.link_speed) / 100); 1298 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN; 1299 break; 1300 } 1301 } else 1302 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN; 1303 spin_unlock_irqrestore(shost->host_lock, flags); 1304 } 1305 1306 /** 1307 * ibmvfc_get_host_port_state - Get host port state 1308 * @shost: scsi host struct 1309 * 1310 * Return value: 1311 * none 1312 **/ 1313 static void ibmvfc_get_host_port_state(struct Scsi_Host *shost) 1314 { 1315 struct ibmvfc_host *vhost = shost_priv(shost); 1316 unsigned long flags; 1317 1318 spin_lock_irqsave(shost->host_lock, flags); 1319 switch (vhost->state) { 1320 case IBMVFC_INITIALIZING: 1321 case IBMVFC_ACTIVE: 1322 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE; 1323 break; 1324 case IBMVFC_LINK_DOWN: 1325 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN; 1326 break; 1327 case IBMVFC_LINK_DEAD: 1328 case IBMVFC_HOST_OFFLINE: 1329 fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE; 1330 break; 1331 case IBMVFC_HALTED: 1332 fc_host_port_state(shost) = FC_PORTSTATE_BLOCKED; 1333 break; 1334 case IBMVFC_NO_CRQ: 1335 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN; 1336 break; 1337 default: 1338 ibmvfc_log(vhost, 3, "Unknown port state: %d\n", vhost->state); 1339 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN; 1340 break; 1341 } 1342 spin_unlock_irqrestore(shost->host_lock, flags); 1343 } 1344 1345 /** 1346 * ibmvfc_set_rport_dev_loss_tmo - Set rport's device loss timeout 1347 * @rport: rport struct 1348 * @timeout: timeout value 1349 * 1350 * Return value: 1351 * none 1352 **/ 1353 static void ibmvfc_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout) 1354 { 1355 if (timeout) 1356 rport->dev_loss_tmo = timeout; 1357 else 1358 rport->dev_loss_tmo = 1; 1359 } 1360 1361 /** 1362 * ibmvfc_release_tgt - Free memory allocated for a target 1363 * @kref: kref struct 1364 * 1365 **/ 1366 static void ibmvfc_release_tgt(struct kref *kref) 1367 { 1368 struct ibmvfc_target *tgt = container_of(kref, struct ibmvfc_target, kref); 1369 kfree(tgt); 1370 } 1371 1372 /** 1373 * ibmvfc_get_starget_node_name - Get SCSI target's node name 1374 * @starget: scsi target struct 1375 * 1376 * Return value: 1377 * none 1378 **/ 1379 static void ibmvfc_get_starget_node_name(struct scsi_target *starget) 1380 { 1381 struct ibmvfc_target *tgt = ibmvfc_get_target(starget); 1382 fc_starget_port_name(starget) = tgt ? tgt->ids.node_name : 0; 1383 if (tgt) 1384 kref_put(&tgt->kref, ibmvfc_release_tgt); 1385 } 1386 1387 /** 1388 * ibmvfc_get_starget_port_name - Get SCSI target's port name 1389 * @starget: scsi target struct 1390 * 1391 * Return value: 1392 * none 1393 **/ 1394 static void ibmvfc_get_starget_port_name(struct scsi_target *starget) 1395 { 1396 struct ibmvfc_target *tgt = ibmvfc_get_target(starget); 1397 fc_starget_port_name(starget) = tgt ? tgt->ids.port_name : 0; 1398 if (tgt) 1399 kref_put(&tgt->kref, ibmvfc_release_tgt); 1400 } 1401 1402 /** 1403 * ibmvfc_get_starget_port_id - Get SCSI target's port ID 1404 * @starget: scsi target struct 1405 * 1406 * Return value: 1407 * none 1408 **/ 1409 static void ibmvfc_get_starget_port_id(struct scsi_target *starget) 1410 { 1411 struct ibmvfc_target *tgt = ibmvfc_get_target(starget); 1412 fc_starget_port_id(starget) = tgt ? tgt->scsi_id : -1; 1413 if (tgt) 1414 kref_put(&tgt->kref, ibmvfc_release_tgt); 1415 } 1416 1417 /** 1418 * ibmvfc_wait_while_resetting - Wait while the host resets 1419 * @vhost: ibmvfc host struct 1420 * 1421 * Return value: 1422 * 0 on success / other on failure 1423 **/ 1424 static int ibmvfc_wait_while_resetting(struct ibmvfc_host *vhost) 1425 { 1426 long timeout = wait_event_timeout(vhost->init_wait_q, 1427 ((vhost->state == IBMVFC_ACTIVE || 1428 vhost->state == IBMVFC_HOST_OFFLINE || 1429 vhost->state == IBMVFC_LINK_DEAD) && 1430 vhost->action == IBMVFC_HOST_ACTION_NONE), 1431 (init_timeout * HZ)); 1432 1433 return timeout ? 0 : -EIO; 1434 } 1435 1436 /** 1437 * ibmvfc_issue_fc_host_lip - Re-initiate link initialization 1438 * @shost: scsi host struct 1439 * 1440 * Return value: 1441 * 0 on success / other on failure 1442 **/ 1443 static int ibmvfc_issue_fc_host_lip(struct Scsi_Host *shost) 1444 { 1445 struct ibmvfc_host *vhost = shost_priv(shost); 1446 1447 dev_err(vhost->dev, "Initiating host LIP. Resetting connection\n"); 1448 ibmvfc_reset_host(vhost); 1449 return ibmvfc_wait_while_resetting(vhost); 1450 } 1451 1452 /** 1453 * ibmvfc_gather_partition_info - Gather info about the LPAR 1454 * @vhost: ibmvfc host struct 1455 * 1456 * Return value: 1457 * none 1458 **/ 1459 static void ibmvfc_gather_partition_info(struct ibmvfc_host *vhost) 1460 { 1461 struct device_node *rootdn; 1462 const char *name; 1463 const unsigned int *num; 1464 1465 rootdn = of_find_node_by_path("/"); 1466 if (!rootdn) 1467 return; 1468 1469 name = of_get_property(rootdn, "ibm,partition-name", NULL); 1470 if (name) 1471 strscpy(vhost->partition_name, name, sizeof(vhost->partition_name)); 1472 num = of_get_property(rootdn, "ibm,partition-no", NULL); 1473 if (num) 1474 vhost->partition_number = *num; 1475 of_node_put(rootdn); 1476 } 1477 1478 /** 1479 * ibmvfc_set_login_info - Setup info for NPIV login 1480 * @vhost: ibmvfc host struct 1481 * 1482 * Return value: 1483 * none 1484 **/ 1485 static void ibmvfc_set_login_info(struct ibmvfc_host *vhost) 1486 { 1487 struct ibmvfc_npiv_login *login_info = &vhost->login_info; 1488 struct ibmvfc_queue *async_crq = &vhost->async_crq; 1489 struct device_node *of_node = vhost->dev->of_node; 1490 const char *location; 1491 u16 max_cmds; 1492 1493 max_cmds = scsi_qdepth + IBMVFC_NUM_INTERNAL_REQ; 1494 if (mq_enabled) 1495 max_cmds += (scsi_qdepth + IBMVFC_NUM_INTERNAL_SUBQ_REQ) * 1496 vhost->scsi_scrqs.desired_queues; 1497 1498 memset(login_info, 0, sizeof(*login_info)); 1499 1500 login_info->ostype = cpu_to_be32(IBMVFC_OS_LINUX); 1501 login_info->max_dma_len = cpu_to_be64(max_sectors << 9); 1502 login_info->max_payload = cpu_to_be32(sizeof(struct ibmvfc_fcp_cmd_iu)); 1503 login_info->max_response = cpu_to_be32(sizeof(struct ibmvfc_fcp_rsp)); 1504 login_info->partition_num = cpu_to_be32(vhost->partition_number); 1505 login_info->vfc_frame_version = cpu_to_be32(1); 1506 login_info->fcp_version = cpu_to_be16(3); 1507 login_info->flags = cpu_to_be16(IBMVFC_FLUSH_ON_HALT); 1508 if (vhost->client_migrated) 1509 login_info->flags |= cpu_to_be16(IBMVFC_CLIENT_MIGRATED); 1510 1511 login_info->max_cmds = cpu_to_be32(max_cmds); 1512 login_info->capabilities = cpu_to_be64(IBMVFC_CAN_MIGRATE | IBMVFC_CAN_SEND_VF_WWPN); 1513 1514 if (vhost->mq_enabled || vhost->using_channels) 1515 login_info->capabilities |= cpu_to_be64(IBMVFC_CAN_USE_CHANNELS); 1516 1517 login_info->async.va = cpu_to_be64(vhost->async_crq.msg_token); 1518 login_info->async.len = cpu_to_be32(async_crq->size * 1519 sizeof(*async_crq->msgs.async)); 1520 strscpy(login_info->partition_name, vhost->partition_name, 1521 sizeof(login_info->partition_name)); 1522 1523 strscpy(login_info->device_name, 1524 dev_name(&vhost->host->shost_gendev), sizeof(login_info->device_name)); 1525 1526 location = of_get_property(of_node, "ibm,loc-code", NULL); 1527 location = location ? location : dev_name(vhost->dev); 1528 strscpy(login_info->drc_name, location, sizeof(login_info->drc_name)); 1529 } 1530 1531 /** 1532 * __ibmvfc_get_event - Gets the next free event in pool 1533 * @queue: ibmvfc queue struct 1534 * @reserved: event is for a reserved management command 1535 * 1536 * Returns a free event from the pool. 1537 **/ 1538 static struct ibmvfc_event *__ibmvfc_get_event(struct ibmvfc_queue *queue, int reserved) 1539 { 1540 struct ibmvfc_event *evt = NULL; 1541 unsigned long flags; 1542 1543 spin_lock_irqsave(&queue->l_lock, flags); 1544 if (reserved && queue->reserved_free) { 1545 evt = list_entry(queue->free.next, struct ibmvfc_event, queue_list); 1546 evt->reserved = 1; 1547 queue->reserved_free--; 1548 } else if (queue->evt_free) { 1549 evt = list_entry(queue->free.next, struct ibmvfc_event, queue_list); 1550 queue->evt_free--; 1551 } else { 1552 goto out; 1553 } 1554 1555 atomic_set(&evt->free, 0); 1556 list_del(&evt->queue_list); 1557 out: 1558 spin_unlock_irqrestore(&queue->l_lock, flags); 1559 return evt; 1560 } 1561 1562 #define ibmvfc_get_event(queue) __ibmvfc_get_event(queue, 0) 1563 #define ibmvfc_get_reserved_event(queue) __ibmvfc_get_event(queue, 1) 1564 1565 /** 1566 * ibmvfc_locked_done - Calls evt completion with host_lock held 1567 * @evt: ibmvfc evt to complete 1568 * 1569 * All non-scsi command completion callbacks have the expectation that the 1570 * host_lock is held. This callback is used by ibmvfc_init_event to wrap a 1571 * MAD evt with the host_lock. 1572 **/ 1573 static void ibmvfc_locked_done(struct ibmvfc_event *evt) 1574 { 1575 unsigned long flags; 1576 1577 spin_lock_irqsave(evt->vhost->host->host_lock, flags); 1578 evt->_done(evt); 1579 spin_unlock_irqrestore(evt->vhost->host->host_lock, flags); 1580 } 1581 1582 /** 1583 * ibmvfc_init_event - Initialize fields in an event struct that are always 1584 * required. 1585 * @evt: The event 1586 * @done: Routine to call when the event is responded to 1587 * @format: SRP or MAD format 1588 **/ 1589 static void ibmvfc_init_event(struct ibmvfc_event *evt, 1590 void (*done) (struct ibmvfc_event *), u8 format) 1591 { 1592 evt->cmnd = NULL; 1593 evt->sync_iu = NULL; 1594 evt->eh_comp = NULL; 1595 evt->crq.format = format; 1596 if (format == IBMVFC_CMD_FORMAT) 1597 evt->done = done; 1598 else { 1599 evt->_done = done; 1600 evt->done = ibmvfc_locked_done; 1601 } 1602 evt->hwq = 0; 1603 } 1604 1605 /** 1606 * ibmvfc_map_sg_list - Initialize scatterlist 1607 * @scmd: scsi command struct 1608 * @nseg: number of scatterlist segments 1609 * @md: memory descriptor list to initialize 1610 **/ 1611 static void ibmvfc_map_sg_list(struct scsi_cmnd *scmd, int nseg, 1612 struct srp_direct_buf *md) 1613 { 1614 int i; 1615 struct scatterlist *sg; 1616 1617 scsi_for_each_sg(scmd, sg, nseg, i) { 1618 md[i].va = cpu_to_be64(sg_dma_address(sg)); 1619 md[i].len = cpu_to_be32(sg_dma_len(sg)); 1620 md[i].key = 0; 1621 } 1622 } 1623 1624 /** 1625 * ibmvfc_map_sg_data - Maps dma for a scatterlist and initializes descriptor fields 1626 * @scmd: struct scsi_cmnd with the scatterlist 1627 * @evt: ibmvfc event struct 1628 * @vfc_cmd: vfc_cmd that contains the memory descriptor 1629 * @dev: device for which to map dma memory 1630 * 1631 * Returns: 1632 * 0 on success / non-zero on failure 1633 **/ 1634 static int ibmvfc_map_sg_data(struct scsi_cmnd *scmd, 1635 struct ibmvfc_event *evt, 1636 struct ibmvfc_cmd *vfc_cmd, struct device *dev) 1637 { 1638 1639 int sg_mapped; 1640 struct srp_direct_buf *data = &vfc_cmd->ioba; 1641 struct ibmvfc_host *vhost = dev_get_drvdata(dev); 1642 struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(evt->vhost, vfc_cmd); 1643 1644 if (cls3_error) 1645 vfc_cmd->flags |= cpu_to_be16(IBMVFC_CLASS_3_ERR); 1646 1647 sg_mapped = scsi_dma_map(scmd); 1648 if (!sg_mapped) { 1649 vfc_cmd->flags |= cpu_to_be16(IBMVFC_NO_MEM_DESC); 1650 return 0; 1651 } else if (unlikely(sg_mapped < 0)) { 1652 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL) 1653 scmd_printk(KERN_ERR, scmd, "Failed to map DMA buffer for command\n"); 1654 return sg_mapped; 1655 } 1656 1657 if (scmd->sc_data_direction == DMA_TO_DEVICE) { 1658 vfc_cmd->flags |= cpu_to_be16(IBMVFC_WRITE); 1659 iu->add_cdb_len |= IBMVFC_WRDATA; 1660 } else { 1661 vfc_cmd->flags |= cpu_to_be16(IBMVFC_READ); 1662 iu->add_cdb_len |= IBMVFC_RDDATA; 1663 } 1664 1665 if (sg_mapped == 1) { 1666 ibmvfc_map_sg_list(scmd, sg_mapped, data); 1667 return 0; 1668 } 1669 1670 vfc_cmd->flags |= cpu_to_be16(IBMVFC_SCATTERLIST); 1671 1672 if (!evt->ext_list) { 1673 evt->ext_list = dma_pool_alloc(vhost->sg_pool, GFP_ATOMIC, 1674 &evt->ext_list_token); 1675 1676 if (!evt->ext_list) { 1677 scsi_dma_unmap(scmd); 1678 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL) 1679 scmd_printk(KERN_ERR, scmd, "Can't allocate memory for scatterlist\n"); 1680 return -ENOMEM; 1681 } 1682 } 1683 1684 ibmvfc_map_sg_list(scmd, sg_mapped, evt->ext_list); 1685 1686 data->va = cpu_to_be64(evt->ext_list_token); 1687 data->len = cpu_to_be32(sg_mapped * sizeof(struct srp_direct_buf)); 1688 data->key = 0; 1689 return 0; 1690 } 1691 1692 /** 1693 * ibmvfc_timeout - Internal command timeout handler 1694 * @t: struct ibmvfc_event that timed out 1695 * 1696 * Called when an internally generated command times out 1697 **/ 1698 static void ibmvfc_timeout(struct timer_list *t) 1699 { 1700 struct ibmvfc_event *evt = from_timer(evt, t, timer); 1701 struct ibmvfc_host *vhost = evt->vhost; 1702 dev_err(vhost->dev, "Command timed out (%p). Resetting connection\n", evt); 1703 ibmvfc_reset_host(vhost); 1704 } 1705 1706 /** 1707 * ibmvfc_send_event - Transforms event to u64 array and calls send_crq() 1708 * @evt: event to be sent 1709 * @vhost: ibmvfc host struct 1710 * @timeout: timeout in seconds - 0 means do not time command 1711 * 1712 * Returns the value returned from ibmvfc_send_crq(). (Zero for success) 1713 **/ 1714 static int ibmvfc_send_event(struct ibmvfc_event *evt, 1715 struct ibmvfc_host *vhost, unsigned long timeout) 1716 { 1717 __be64 *crq_as_u64 = (__be64 *) &evt->crq; 1718 unsigned long flags; 1719 int rc; 1720 1721 /* Copy the IU into the transfer area */ 1722 *evt->xfer_iu = evt->iu; 1723 if (evt->crq.format == IBMVFC_CMD_FORMAT) 1724 evt->xfer_iu->cmd.tag = cpu_to_be64((u64)evt); 1725 else if (evt->crq.format == IBMVFC_MAD_FORMAT) 1726 evt->xfer_iu->mad_common.tag = cpu_to_be64((u64)evt); 1727 else 1728 BUG(); 1729 1730 timer_setup(&evt->timer, ibmvfc_timeout, 0); 1731 1732 if (timeout) { 1733 evt->timer.expires = jiffies + (timeout * HZ); 1734 add_timer(&evt->timer); 1735 } 1736 1737 spin_lock_irqsave(&evt->queue->l_lock, flags); 1738 list_add_tail(&evt->queue_list, &evt->queue->sent); 1739 atomic_set(&evt->active, 1); 1740 1741 mb(); 1742 1743 if (evt->queue->fmt == IBMVFC_SUB_CRQ_FMT) 1744 rc = ibmvfc_send_sub_crq(vhost, 1745 evt->queue->vios_cookie, 1746 be64_to_cpu(crq_as_u64[0]), 1747 be64_to_cpu(crq_as_u64[1]), 1748 0, 0); 1749 else 1750 rc = ibmvfc_send_crq(vhost, be64_to_cpu(crq_as_u64[0]), 1751 be64_to_cpu(crq_as_u64[1])); 1752 1753 if (rc) { 1754 atomic_set(&evt->active, 0); 1755 list_del(&evt->queue_list); 1756 spin_unlock_irqrestore(&evt->queue->l_lock, flags); 1757 del_timer(&evt->timer); 1758 1759 /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY. 1760 * Firmware will send a CRQ with a transport event (0xFF) to 1761 * tell this client what has happened to the transport. This 1762 * will be handled in ibmvfc_handle_crq() 1763 */ 1764 if (rc == H_CLOSED) { 1765 if (printk_ratelimit()) 1766 dev_warn(vhost->dev, "Send warning. Receive queue closed, will retry.\n"); 1767 if (evt->cmnd) 1768 scsi_dma_unmap(evt->cmnd); 1769 ibmvfc_free_event(evt); 1770 return SCSI_MLQUEUE_HOST_BUSY; 1771 } 1772 1773 dev_err(vhost->dev, "Send error (rc=%d)\n", rc); 1774 if (evt->cmnd) { 1775 evt->cmnd->result = DID_ERROR << 16; 1776 evt->done = ibmvfc_scsi_eh_done; 1777 } else 1778 evt->xfer_iu->mad_common.status = cpu_to_be16(IBMVFC_MAD_CRQ_ERROR); 1779 1780 evt->done(evt); 1781 } else { 1782 spin_unlock_irqrestore(&evt->queue->l_lock, flags); 1783 ibmvfc_trc_start(evt); 1784 } 1785 1786 return 0; 1787 } 1788 1789 /** 1790 * ibmvfc_log_error - Log an error for the failed command if appropriate 1791 * @evt: ibmvfc event to log 1792 * 1793 **/ 1794 static void ibmvfc_log_error(struct ibmvfc_event *evt) 1795 { 1796 struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd; 1797 struct ibmvfc_host *vhost = evt->vhost; 1798 struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd); 1799 struct scsi_cmnd *cmnd = evt->cmnd; 1800 const char *err = unknown_error; 1801 int index = ibmvfc_get_err_index(be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error)); 1802 int logerr = 0; 1803 int rsp_code = 0; 1804 1805 if (index >= 0) { 1806 logerr = cmd_status[index].log; 1807 err = cmd_status[index].name; 1808 } 1809 1810 if (!logerr && (vhost->log_level <= (IBMVFC_DEFAULT_LOG_LEVEL + 1))) 1811 return; 1812 1813 if (rsp->flags & FCP_RSP_LEN_VALID) 1814 rsp_code = rsp->data.info.rsp_code; 1815 1816 scmd_printk(KERN_ERR, cmnd, "Command (%02X) : %s (%x:%x) " 1817 "flags: %x fcp_rsp: %x, resid=%d, scsi_status: %x\n", 1818 cmnd->cmnd[0], err, be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error), 1819 rsp->flags, rsp_code, scsi_get_resid(cmnd), rsp->scsi_status); 1820 } 1821 1822 /** 1823 * ibmvfc_relogin - Log back into the specified device 1824 * @sdev: scsi device struct 1825 * 1826 **/ 1827 static void ibmvfc_relogin(struct scsi_device *sdev) 1828 { 1829 struct ibmvfc_host *vhost = shost_priv(sdev->host); 1830 struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); 1831 struct ibmvfc_target *tgt; 1832 unsigned long flags; 1833 1834 spin_lock_irqsave(vhost->host->host_lock, flags); 1835 list_for_each_entry(tgt, &vhost->targets, queue) { 1836 if (rport == tgt->rport) { 1837 ibmvfc_del_tgt(tgt); 1838 break; 1839 } 1840 } 1841 1842 ibmvfc_reinit_host(vhost); 1843 spin_unlock_irqrestore(vhost->host->host_lock, flags); 1844 } 1845 1846 /** 1847 * ibmvfc_scsi_done - Handle responses from commands 1848 * @evt: ibmvfc event to be handled 1849 * 1850 * Used as a callback when sending scsi cmds. 1851 **/ 1852 static void ibmvfc_scsi_done(struct ibmvfc_event *evt) 1853 { 1854 struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd; 1855 struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(evt->vhost, vfc_cmd); 1856 struct scsi_cmnd *cmnd = evt->cmnd; 1857 u32 rsp_len = 0; 1858 u32 sense_len = be32_to_cpu(rsp->fcp_sense_len); 1859 1860 if (cmnd) { 1861 if (be16_to_cpu(vfc_cmd->response_flags) & IBMVFC_ADAPTER_RESID_VALID) 1862 scsi_set_resid(cmnd, be32_to_cpu(vfc_cmd->adapter_resid)); 1863 else if (rsp->flags & FCP_RESID_UNDER) 1864 scsi_set_resid(cmnd, be32_to_cpu(rsp->fcp_resid)); 1865 else 1866 scsi_set_resid(cmnd, 0); 1867 1868 if (vfc_cmd->status) { 1869 cmnd->result = ibmvfc_get_err_result(evt->vhost, vfc_cmd); 1870 1871 if (rsp->flags & FCP_RSP_LEN_VALID) 1872 rsp_len = be32_to_cpu(rsp->fcp_rsp_len); 1873 if ((sense_len + rsp_len) > SCSI_SENSE_BUFFERSIZE) 1874 sense_len = SCSI_SENSE_BUFFERSIZE - rsp_len; 1875 if ((rsp->flags & FCP_SNS_LEN_VALID) && rsp->fcp_sense_len && rsp_len <= 8) 1876 memcpy(cmnd->sense_buffer, rsp->data.sense + rsp_len, sense_len); 1877 if ((be16_to_cpu(vfc_cmd->status) & IBMVFC_VIOS_FAILURE) && 1878 (be16_to_cpu(vfc_cmd->error) == IBMVFC_PLOGI_REQUIRED)) 1879 ibmvfc_relogin(cmnd->device); 1880 1881 if (!cmnd->result && (!scsi_get_resid(cmnd) || (rsp->flags & FCP_RESID_OVER))) 1882 cmnd->result = (DID_ERROR << 16); 1883 1884 ibmvfc_log_error(evt); 1885 } 1886 1887 if (!cmnd->result && 1888 (scsi_bufflen(cmnd) - scsi_get_resid(cmnd) < cmnd->underflow)) 1889 cmnd->result = (DID_ERROR << 16); 1890 1891 scsi_dma_unmap(cmnd); 1892 scsi_done(cmnd); 1893 } 1894 1895 ibmvfc_free_event(evt); 1896 } 1897 1898 /** 1899 * ibmvfc_host_chkready - Check if the host can accept commands 1900 * @vhost: struct ibmvfc host 1901 * 1902 * Returns: 1903 * 1 if host can accept command / 0 if not 1904 **/ 1905 static inline int ibmvfc_host_chkready(struct ibmvfc_host *vhost) 1906 { 1907 int result = 0; 1908 1909 switch (vhost->state) { 1910 case IBMVFC_LINK_DEAD: 1911 case IBMVFC_HOST_OFFLINE: 1912 result = DID_NO_CONNECT << 16; 1913 break; 1914 case IBMVFC_NO_CRQ: 1915 case IBMVFC_INITIALIZING: 1916 case IBMVFC_HALTED: 1917 case IBMVFC_LINK_DOWN: 1918 result = DID_REQUEUE << 16; 1919 break; 1920 case IBMVFC_ACTIVE: 1921 result = 0; 1922 break; 1923 } 1924 1925 return result; 1926 } 1927 1928 static struct ibmvfc_cmd *ibmvfc_init_vfc_cmd(struct ibmvfc_event *evt, struct scsi_device *sdev) 1929 { 1930 struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); 1931 struct ibmvfc_host *vhost = evt->vhost; 1932 struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd; 1933 struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd); 1934 struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd); 1935 size_t offset; 1936 1937 memset(vfc_cmd, 0, sizeof(*vfc_cmd)); 1938 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) { 1939 offset = offsetof(struct ibmvfc_cmd, v2.rsp); 1940 vfc_cmd->target_wwpn = cpu_to_be64(rport->port_name); 1941 } else 1942 offset = offsetof(struct ibmvfc_cmd, v1.rsp); 1943 vfc_cmd->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offset); 1944 vfc_cmd->resp.len = cpu_to_be32(sizeof(*rsp)); 1945 vfc_cmd->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE); 1946 vfc_cmd->payload_len = cpu_to_be32(sizeof(*iu)); 1947 vfc_cmd->resp_len = cpu_to_be32(sizeof(*rsp)); 1948 vfc_cmd->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata); 1949 vfc_cmd->tgt_scsi_id = cpu_to_be64(rport->port_id); 1950 int_to_scsilun(sdev->lun, &iu->lun); 1951 1952 return vfc_cmd; 1953 } 1954 1955 /** 1956 * ibmvfc_queuecommand - The queuecommand function of the scsi template 1957 * @shost: scsi host struct 1958 * @cmnd: struct scsi_cmnd to be executed 1959 * 1960 * Returns: 1961 * 0 on success / other on failure 1962 **/ 1963 static int ibmvfc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *cmnd) 1964 { 1965 struct ibmvfc_host *vhost = shost_priv(shost); 1966 struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device)); 1967 struct ibmvfc_cmd *vfc_cmd; 1968 struct ibmvfc_fcp_cmd_iu *iu; 1969 struct ibmvfc_event *evt; 1970 u32 tag_and_hwq = blk_mq_unique_tag(scsi_cmd_to_rq(cmnd)); 1971 u16 hwq = blk_mq_unique_tag_to_hwq(tag_and_hwq); 1972 u16 scsi_channel; 1973 int rc; 1974 1975 if (unlikely((rc = fc_remote_port_chkready(rport))) || 1976 unlikely((rc = ibmvfc_host_chkready(vhost)))) { 1977 cmnd->result = rc; 1978 scsi_done(cmnd); 1979 return 0; 1980 } 1981 1982 cmnd->result = (DID_OK << 16); 1983 if (vhost->using_channels) { 1984 scsi_channel = hwq % vhost->scsi_scrqs.active_queues; 1985 evt = ibmvfc_get_event(&vhost->scsi_scrqs.scrqs[scsi_channel]); 1986 if (!evt) 1987 return SCSI_MLQUEUE_HOST_BUSY; 1988 1989 evt->hwq = hwq % vhost->scsi_scrqs.active_queues; 1990 } else { 1991 evt = ibmvfc_get_event(&vhost->crq); 1992 if (!evt) 1993 return SCSI_MLQUEUE_HOST_BUSY; 1994 } 1995 1996 ibmvfc_init_event(evt, ibmvfc_scsi_done, IBMVFC_CMD_FORMAT); 1997 evt->cmnd = cmnd; 1998 1999 vfc_cmd = ibmvfc_init_vfc_cmd(evt, cmnd->device); 2000 iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd); 2001 2002 iu->xfer_len = cpu_to_be32(scsi_bufflen(cmnd)); 2003 memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len); 2004 2005 if (cmnd->flags & SCMD_TAGGED) { 2006 vfc_cmd->task_tag = cpu_to_be64(scsi_cmd_to_rq(cmnd)->tag); 2007 iu->pri_task_attr = IBMVFC_SIMPLE_TASK; 2008 } 2009 2010 vfc_cmd->correlation = cpu_to_be64((u64)evt); 2011 2012 if (likely(!(rc = ibmvfc_map_sg_data(cmnd, evt, vfc_cmd, vhost->dev)))) 2013 return ibmvfc_send_event(evt, vhost, 0); 2014 2015 ibmvfc_free_event(evt); 2016 if (rc == -ENOMEM) 2017 return SCSI_MLQUEUE_HOST_BUSY; 2018 2019 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL) 2020 scmd_printk(KERN_ERR, cmnd, 2021 "Failed to map DMA buffer for command. rc=%d\n", rc); 2022 2023 cmnd->result = DID_ERROR << 16; 2024 scsi_done(cmnd); 2025 return 0; 2026 } 2027 2028 /** 2029 * ibmvfc_sync_completion - Signal that a synchronous command has completed 2030 * @evt: ibmvfc event struct 2031 * 2032 **/ 2033 static void ibmvfc_sync_completion(struct ibmvfc_event *evt) 2034 { 2035 /* copy the response back */ 2036 if (evt->sync_iu) 2037 *evt->sync_iu = *evt->xfer_iu; 2038 2039 complete(&evt->comp); 2040 } 2041 2042 /** 2043 * ibmvfc_bsg_timeout_done - Completion handler for cancelling BSG commands 2044 * @evt: struct ibmvfc_event 2045 * 2046 **/ 2047 static void ibmvfc_bsg_timeout_done(struct ibmvfc_event *evt) 2048 { 2049 struct ibmvfc_host *vhost = evt->vhost; 2050 2051 ibmvfc_free_event(evt); 2052 vhost->aborting_passthru = 0; 2053 dev_info(vhost->dev, "Passthru command cancelled\n"); 2054 } 2055 2056 /** 2057 * ibmvfc_bsg_timeout - Handle a BSG timeout 2058 * @job: struct bsg_job that timed out 2059 * 2060 * Returns: 2061 * 0 on success / other on failure 2062 **/ 2063 static int ibmvfc_bsg_timeout(struct bsg_job *job) 2064 { 2065 struct ibmvfc_host *vhost = shost_priv(fc_bsg_to_shost(job)); 2066 unsigned long port_id = (unsigned long)job->dd_data; 2067 struct ibmvfc_event *evt; 2068 struct ibmvfc_tmf *tmf; 2069 unsigned long flags; 2070 int rc; 2071 2072 ENTER; 2073 spin_lock_irqsave(vhost->host->host_lock, flags); 2074 if (vhost->aborting_passthru || vhost->state != IBMVFC_ACTIVE) { 2075 __ibmvfc_reset_host(vhost); 2076 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2077 return 0; 2078 } 2079 2080 vhost->aborting_passthru = 1; 2081 evt = ibmvfc_get_reserved_event(&vhost->crq); 2082 if (!evt) { 2083 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2084 return -ENOMEM; 2085 } 2086 2087 ibmvfc_init_event(evt, ibmvfc_bsg_timeout_done, IBMVFC_MAD_FORMAT); 2088 2089 tmf = &evt->iu.tmf; 2090 memset(tmf, 0, sizeof(*tmf)); 2091 tmf->common.version = cpu_to_be32(1); 2092 tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD); 2093 tmf->common.length = cpu_to_be16(sizeof(*tmf)); 2094 tmf->scsi_id = cpu_to_be64(port_id); 2095 tmf->cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY); 2096 tmf->my_cancel_key = cpu_to_be32(IBMVFC_INTERNAL_CANCEL_KEY); 2097 rc = ibmvfc_send_event(evt, vhost, default_timeout); 2098 2099 if (rc != 0) { 2100 vhost->aborting_passthru = 0; 2101 dev_err(vhost->dev, "Failed to send cancel event. rc=%d\n", rc); 2102 rc = -EIO; 2103 } else 2104 dev_info(vhost->dev, "Cancelling passthru command to port id 0x%lx\n", 2105 port_id); 2106 2107 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2108 2109 LEAVE; 2110 return rc; 2111 } 2112 2113 /** 2114 * ibmvfc_bsg_plogi - PLOGI into a target to handle a BSG command 2115 * @vhost: struct ibmvfc_host to send command 2116 * @port_id: port ID to send command 2117 * 2118 * Returns: 2119 * 0 on success / other on failure 2120 **/ 2121 static int ibmvfc_bsg_plogi(struct ibmvfc_host *vhost, unsigned int port_id) 2122 { 2123 struct ibmvfc_port_login *plogi; 2124 struct ibmvfc_target *tgt; 2125 struct ibmvfc_event *evt; 2126 union ibmvfc_iu rsp_iu; 2127 unsigned long flags; 2128 int rc = 0, issue_login = 1; 2129 2130 ENTER; 2131 spin_lock_irqsave(vhost->host->host_lock, flags); 2132 list_for_each_entry(tgt, &vhost->targets, queue) { 2133 if (tgt->scsi_id == port_id) { 2134 issue_login = 0; 2135 break; 2136 } 2137 } 2138 2139 if (!issue_login) 2140 goto unlock_out; 2141 if (unlikely((rc = ibmvfc_host_chkready(vhost)))) 2142 goto unlock_out; 2143 2144 evt = ibmvfc_get_reserved_event(&vhost->crq); 2145 if (!evt) { 2146 rc = -ENOMEM; 2147 goto unlock_out; 2148 } 2149 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT); 2150 plogi = &evt->iu.plogi; 2151 memset(plogi, 0, sizeof(*plogi)); 2152 plogi->common.version = cpu_to_be32(1); 2153 plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN); 2154 plogi->common.length = cpu_to_be16(sizeof(*plogi)); 2155 plogi->scsi_id = cpu_to_be64(port_id); 2156 evt->sync_iu = &rsp_iu; 2157 init_completion(&evt->comp); 2158 2159 rc = ibmvfc_send_event(evt, vhost, default_timeout); 2160 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2161 2162 if (rc) 2163 return -EIO; 2164 2165 wait_for_completion(&evt->comp); 2166 2167 if (rsp_iu.plogi.common.status) 2168 rc = -EIO; 2169 2170 spin_lock_irqsave(vhost->host->host_lock, flags); 2171 ibmvfc_free_event(evt); 2172 unlock_out: 2173 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2174 LEAVE; 2175 return rc; 2176 } 2177 2178 /** 2179 * ibmvfc_bsg_request - Handle a BSG request 2180 * @job: struct bsg_job to be executed 2181 * 2182 * Returns: 2183 * 0 on success / other on failure 2184 **/ 2185 static int ibmvfc_bsg_request(struct bsg_job *job) 2186 { 2187 struct ibmvfc_host *vhost = shost_priv(fc_bsg_to_shost(job)); 2188 struct fc_rport *rport = fc_bsg_to_rport(job); 2189 struct ibmvfc_passthru_mad *mad; 2190 struct ibmvfc_event *evt; 2191 union ibmvfc_iu rsp_iu; 2192 unsigned long flags, port_id = -1; 2193 struct fc_bsg_request *bsg_request = job->request; 2194 struct fc_bsg_reply *bsg_reply = job->reply; 2195 unsigned int code = bsg_request->msgcode; 2196 int rc = 0, req_seg, rsp_seg, issue_login = 0; 2197 u32 fc_flags, rsp_len; 2198 2199 ENTER; 2200 bsg_reply->reply_payload_rcv_len = 0; 2201 if (rport) 2202 port_id = rport->port_id; 2203 2204 switch (code) { 2205 case FC_BSG_HST_ELS_NOLOGIN: 2206 port_id = (bsg_request->rqst_data.h_els.port_id[0] << 16) | 2207 (bsg_request->rqst_data.h_els.port_id[1] << 8) | 2208 bsg_request->rqst_data.h_els.port_id[2]; 2209 fallthrough; 2210 case FC_BSG_RPT_ELS: 2211 fc_flags = IBMVFC_FC_ELS; 2212 break; 2213 case FC_BSG_HST_CT: 2214 issue_login = 1; 2215 port_id = (bsg_request->rqst_data.h_ct.port_id[0] << 16) | 2216 (bsg_request->rqst_data.h_ct.port_id[1] << 8) | 2217 bsg_request->rqst_data.h_ct.port_id[2]; 2218 fallthrough; 2219 case FC_BSG_RPT_CT: 2220 fc_flags = IBMVFC_FC_CT_IU; 2221 break; 2222 default: 2223 return -ENOTSUPP; 2224 } 2225 2226 if (port_id == -1) 2227 return -EINVAL; 2228 if (!mutex_trylock(&vhost->passthru_mutex)) 2229 return -EBUSY; 2230 2231 job->dd_data = (void *)port_id; 2232 req_seg = dma_map_sg(vhost->dev, job->request_payload.sg_list, 2233 job->request_payload.sg_cnt, DMA_TO_DEVICE); 2234 2235 if (!req_seg) { 2236 mutex_unlock(&vhost->passthru_mutex); 2237 return -ENOMEM; 2238 } 2239 2240 rsp_seg = dma_map_sg(vhost->dev, job->reply_payload.sg_list, 2241 job->reply_payload.sg_cnt, DMA_FROM_DEVICE); 2242 2243 if (!rsp_seg) { 2244 dma_unmap_sg(vhost->dev, job->request_payload.sg_list, 2245 job->request_payload.sg_cnt, DMA_TO_DEVICE); 2246 mutex_unlock(&vhost->passthru_mutex); 2247 return -ENOMEM; 2248 } 2249 2250 if (req_seg > 1 || rsp_seg > 1) { 2251 rc = -EINVAL; 2252 goto out; 2253 } 2254 2255 if (issue_login) 2256 rc = ibmvfc_bsg_plogi(vhost, port_id); 2257 2258 spin_lock_irqsave(vhost->host->host_lock, flags); 2259 2260 if (unlikely(rc || (rport && (rc = fc_remote_port_chkready(rport)))) || 2261 unlikely((rc = ibmvfc_host_chkready(vhost)))) { 2262 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2263 goto out; 2264 } 2265 2266 evt = ibmvfc_get_reserved_event(&vhost->crq); 2267 if (!evt) { 2268 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2269 rc = -ENOMEM; 2270 goto out; 2271 } 2272 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT); 2273 mad = &evt->iu.passthru; 2274 2275 memset(mad, 0, sizeof(*mad)); 2276 mad->common.version = cpu_to_be32(1); 2277 mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU); 2278 mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu)); 2279 2280 mad->cmd_ioba.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + 2281 offsetof(struct ibmvfc_passthru_mad, iu)); 2282 mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu)); 2283 2284 mad->iu.cmd_len = cpu_to_be32(job->request_payload.payload_len); 2285 mad->iu.rsp_len = cpu_to_be32(job->reply_payload.payload_len); 2286 mad->iu.flags = cpu_to_be32(fc_flags); 2287 mad->iu.cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY); 2288 2289 mad->iu.cmd.va = cpu_to_be64(sg_dma_address(job->request_payload.sg_list)); 2290 mad->iu.cmd.len = cpu_to_be32(sg_dma_len(job->request_payload.sg_list)); 2291 mad->iu.rsp.va = cpu_to_be64(sg_dma_address(job->reply_payload.sg_list)); 2292 mad->iu.rsp.len = cpu_to_be32(sg_dma_len(job->reply_payload.sg_list)); 2293 mad->iu.scsi_id = cpu_to_be64(port_id); 2294 mad->iu.tag = cpu_to_be64((u64)evt); 2295 rsp_len = be32_to_cpu(mad->iu.rsp.len); 2296 2297 evt->sync_iu = &rsp_iu; 2298 init_completion(&evt->comp); 2299 rc = ibmvfc_send_event(evt, vhost, 0); 2300 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2301 2302 if (rc) { 2303 rc = -EIO; 2304 goto out; 2305 } 2306 2307 wait_for_completion(&evt->comp); 2308 2309 if (rsp_iu.passthru.common.status) 2310 rc = -EIO; 2311 else 2312 bsg_reply->reply_payload_rcv_len = rsp_len; 2313 2314 spin_lock_irqsave(vhost->host->host_lock, flags); 2315 ibmvfc_free_event(evt); 2316 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2317 bsg_reply->result = rc; 2318 bsg_job_done(job, bsg_reply->result, 2319 bsg_reply->reply_payload_rcv_len); 2320 rc = 0; 2321 out: 2322 dma_unmap_sg(vhost->dev, job->request_payload.sg_list, 2323 job->request_payload.sg_cnt, DMA_TO_DEVICE); 2324 dma_unmap_sg(vhost->dev, job->reply_payload.sg_list, 2325 job->reply_payload.sg_cnt, DMA_FROM_DEVICE); 2326 mutex_unlock(&vhost->passthru_mutex); 2327 LEAVE; 2328 return rc; 2329 } 2330 2331 /** 2332 * ibmvfc_reset_device - Reset the device with the specified reset type 2333 * @sdev: scsi device to reset 2334 * @type: reset type 2335 * @desc: reset type description for log messages 2336 * 2337 * Returns: 2338 * 0 on success / other on failure 2339 **/ 2340 static int ibmvfc_reset_device(struct scsi_device *sdev, int type, char *desc) 2341 { 2342 struct ibmvfc_host *vhost = shost_priv(sdev->host); 2343 struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); 2344 struct ibmvfc_cmd *tmf; 2345 struct ibmvfc_event *evt = NULL; 2346 union ibmvfc_iu rsp_iu; 2347 struct ibmvfc_fcp_cmd_iu *iu; 2348 struct ibmvfc_fcp_rsp *fc_rsp = ibmvfc_get_fcp_rsp(vhost, &rsp_iu.cmd); 2349 int rsp_rc = -EBUSY; 2350 unsigned long flags; 2351 int rsp_code = 0; 2352 2353 spin_lock_irqsave(vhost->host->host_lock, flags); 2354 if (vhost->state == IBMVFC_ACTIVE) { 2355 if (vhost->using_channels) 2356 evt = ibmvfc_get_event(&vhost->scsi_scrqs.scrqs[0]); 2357 else 2358 evt = ibmvfc_get_event(&vhost->crq); 2359 2360 if (!evt) { 2361 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2362 return -ENOMEM; 2363 } 2364 2365 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT); 2366 tmf = ibmvfc_init_vfc_cmd(evt, sdev); 2367 iu = ibmvfc_get_fcp_iu(vhost, tmf); 2368 2369 tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF)); 2370 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) 2371 tmf->target_wwpn = cpu_to_be64(rport->port_name); 2372 iu->tmf_flags = type; 2373 evt->sync_iu = &rsp_iu; 2374 2375 init_completion(&evt->comp); 2376 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout); 2377 } 2378 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2379 2380 if (rsp_rc != 0) { 2381 sdev_printk(KERN_ERR, sdev, "Failed to send %s reset event. rc=%d\n", 2382 desc, rsp_rc); 2383 return -EIO; 2384 } 2385 2386 sdev_printk(KERN_INFO, sdev, "Resetting %s\n", desc); 2387 wait_for_completion(&evt->comp); 2388 2389 if (rsp_iu.cmd.status) 2390 rsp_code = ibmvfc_get_err_result(vhost, &rsp_iu.cmd); 2391 2392 if (rsp_code) { 2393 if (fc_rsp->flags & FCP_RSP_LEN_VALID) 2394 rsp_code = fc_rsp->data.info.rsp_code; 2395 2396 sdev_printk(KERN_ERR, sdev, "%s reset failed: %s (%x:%x) " 2397 "flags: %x fcp_rsp: %x, scsi_status: %x\n", desc, 2398 ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)), 2399 be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error), fc_rsp->flags, rsp_code, 2400 fc_rsp->scsi_status); 2401 rsp_rc = -EIO; 2402 } else 2403 sdev_printk(KERN_INFO, sdev, "%s reset successful\n", desc); 2404 2405 spin_lock_irqsave(vhost->host->host_lock, flags); 2406 ibmvfc_free_event(evt); 2407 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2408 return rsp_rc; 2409 } 2410 2411 /** 2412 * ibmvfc_match_rport - Match function for specified remote port 2413 * @evt: ibmvfc event struct 2414 * @rport: device to match 2415 * 2416 * Returns: 2417 * 1 if event matches rport / 0 if event does not match rport 2418 **/ 2419 static int ibmvfc_match_rport(struct ibmvfc_event *evt, void *rport) 2420 { 2421 struct fc_rport *cmd_rport; 2422 2423 if (evt->cmnd) { 2424 cmd_rport = starget_to_rport(scsi_target(evt->cmnd->device)); 2425 if (cmd_rport == rport) 2426 return 1; 2427 } 2428 return 0; 2429 } 2430 2431 /** 2432 * ibmvfc_match_target - Match function for specified target 2433 * @evt: ibmvfc event struct 2434 * @device: device to match (starget) 2435 * 2436 * Returns: 2437 * 1 if event matches starget / 0 if event does not match starget 2438 **/ 2439 static int ibmvfc_match_target(struct ibmvfc_event *evt, void *device) 2440 { 2441 if (evt->cmnd && scsi_target(evt->cmnd->device) == device) 2442 return 1; 2443 return 0; 2444 } 2445 2446 /** 2447 * ibmvfc_match_lun - Match function for specified LUN 2448 * @evt: ibmvfc event struct 2449 * @device: device to match (sdev) 2450 * 2451 * Returns: 2452 * 1 if event matches sdev / 0 if event does not match sdev 2453 **/ 2454 static int ibmvfc_match_lun(struct ibmvfc_event *evt, void *device) 2455 { 2456 if (evt->cmnd && evt->cmnd->device == device) 2457 return 1; 2458 return 0; 2459 } 2460 2461 /** 2462 * ibmvfc_event_is_free - Check if event is free or not 2463 * @evt: ibmvfc event struct 2464 * 2465 * Returns: 2466 * true / false 2467 **/ 2468 static bool ibmvfc_event_is_free(struct ibmvfc_event *evt) 2469 { 2470 struct ibmvfc_event *loop_evt; 2471 2472 list_for_each_entry(loop_evt, &evt->queue->free, queue_list) 2473 if (loop_evt == evt) 2474 return true; 2475 2476 return false; 2477 } 2478 2479 /** 2480 * ibmvfc_wait_for_ops - Wait for ops to complete 2481 * @vhost: ibmvfc host struct 2482 * @device: device to match (starget or sdev) 2483 * @match: match function 2484 * 2485 * Returns: 2486 * SUCCESS / FAILED 2487 **/ 2488 static int ibmvfc_wait_for_ops(struct ibmvfc_host *vhost, void *device, 2489 int (*match) (struct ibmvfc_event *, void *)) 2490 { 2491 struct ibmvfc_event *evt; 2492 DECLARE_COMPLETION_ONSTACK(comp); 2493 int wait, i, q_index, q_size; 2494 unsigned long flags; 2495 signed long timeout = IBMVFC_ABORT_WAIT_TIMEOUT * HZ; 2496 struct ibmvfc_queue *queues; 2497 2498 ENTER; 2499 if (vhost->mq_enabled && vhost->using_channels) { 2500 queues = vhost->scsi_scrqs.scrqs; 2501 q_size = vhost->scsi_scrqs.active_queues; 2502 } else { 2503 queues = &vhost->crq; 2504 q_size = 1; 2505 } 2506 2507 do { 2508 wait = 0; 2509 spin_lock_irqsave(vhost->host->host_lock, flags); 2510 for (q_index = 0; q_index < q_size; q_index++) { 2511 spin_lock(&queues[q_index].l_lock); 2512 for (i = 0; i < queues[q_index].evt_pool.size; i++) { 2513 evt = &queues[q_index].evt_pool.events[i]; 2514 if (!ibmvfc_event_is_free(evt)) { 2515 if (match(evt, device)) { 2516 evt->eh_comp = ∁ 2517 wait++; 2518 } 2519 } 2520 } 2521 spin_unlock(&queues[q_index].l_lock); 2522 } 2523 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2524 2525 if (wait) { 2526 timeout = wait_for_completion_timeout(&comp, timeout); 2527 2528 if (!timeout) { 2529 wait = 0; 2530 spin_lock_irqsave(vhost->host->host_lock, flags); 2531 for (q_index = 0; q_index < q_size; q_index++) { 2532 spin_lock(&queues[q_index].l_lock); 2533 for (i = 0; i < queues[q_index].evt_pool.size; i++) { 2534 evt = &queues[q_index].evt_pool.events[i]; 2535 if (!ibmvfc_event_is_free(evt)) { 2536 if (match(evt, device)) { 2537 evt->eh_comp = NULL; 2538 wait++; 2539 } 2540 } 2541 } 2542 spin_unlock(&queues[q_index].l_lock); 2543 } 2544 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2545 if (wait) 2546 dev_err(vhost->dev, "Timed out waiting for aborted commands\n"); 2547 LEAVE; 2548 return wait ? FAILED : SUCCESS; 2549 } 2550 } 2551 } while (wait); 2552 2553 LEAVE; 2554 return SUCCESS; 2555 } 2556 2557 static struct ibmvfc_event *ibmvfc_init_tmf(struct ibmvfc_queue *queue, 2558 struct scsi_device *sdev, 2559 int type) 2560 { 2561 struct ibmvfc_host *vhost = shost_priv(sdev->host); 2562 struct scsi_target *starget = scsi_target(sdev); 2563 struct fc_rport *rport = starget_to_rport(starget); 2564 struct ibmvfc_event *evt; 2565 struct ibmvfc_tmf *tmf; 2566 2567 evt = ibmvfc_get_reserved_event(queue); 2568 if (!evt) 2569 return NULL; 2570 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT); 2571 2572 tmf = &evt->iu.tmf; 2573 memset(tmf, 0, sizeof(*tmf)); 2574 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) { 2575 tmf->common.version = cpu_to_be32(2); 2576 tmf->target_wwpn = cpu_to_be64(rport->port_name); 2577 } else { 2578 tmf->common.version = cpu_to_be32(1); 2579 } 2580 tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD); 2581 tmf->common.length = cpu_to_be16(sizeof(*tmf)); 2582 tmf->scsi_id = cpu_to_be64(rport->port_id); 2583 int_to_scsilun(sdev->lun, &tmf->lun); 2584 if (!ibmvfc_check_caps(vhost, IBMVFC_CAN_SUPPRESS_ABTS)) 2585 type &= ~IBMVFC_TMF_SUPPRESS_ABTS; 2586 if (vhost->state == IBMVFC_ACTIVE) 2587 tmf->flags = cpu_to_be32((type | IBMVFC_TMF_LUA_VALID)); 2588 else 2589 tmf->flags = cpu_to_be32(((type & IBMVFC_TMF_SUPPRESS_ABTS) | IBMVFC_TMF_LUA_VALID)); 2590 tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata); 2591 tmf->my_cancel_key = cpu_to_be32((unsigned long)starget->hostdata); 2592 2593 init_completion(&evt->comp); 2594 2595 return evt; 2596 } 2597 2598 static int ibmvfc_cancel_all_mq(struct scsi_device *sdev, int type) 2599 { 2600 struct ibmvfc_host *vhost = shost_priv(sdev->host); 2601 struct ibmvfc_event *evt, *found_evt, *temp; 2602 struct ibmvfc_queue *queues = vhost->scsi_scrqs.scrqs; 2603 unsigned long flags; 2604 int num_hwq, i; 2605 int fail = 0; 2606 LIST_HEAD(cancelq); 2607 u16 status; 2608 2609 ENTER; 2610 spin_lock_irqsave(vhost->host->host_lock, flags); 2611 num_hwq = vhost->scsi_scrqs.active_queues; 2612 for (i = 0; i < num_hwq; i++) { 2613 spin_lock(queues[i].q_lock); 2614 spin_lock(&queues[i].l_lock); 2615 found_evt = NULL; 2616 list_for_each_entry(evt, &queues[i].sent, queue_list) { 2617 if (evt->cmnd && evt->cmnd->device == sdev) { 2618 found_evt = evt; 2619 break; 2620 } 2621 } 2622 spin_unlock(&queues[i].l_lock); 2623 2624 if (found_evt && vhost->logged_in) { 2625 evt = ibmvfc_init_tmf(&queues[i], sdev, type); 2626 if (!evt) { 2627 spin_unlock(queues[i].q_lock); 2628 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2629 return -ENOMEM; 2630 } 2631 evt->sync_iu = &queues[i].cancel_rsp; 2632 ibmvfc_send_event(evt, vhost, default_timeout); 2633 list_add_tail(&evt->cancel, &cancelq); 2634 } 2635 2636 spin_unlock(queues[i].q_lock); 2637 } 2638 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2639 2640 if (list_empty(&cancelq)) { 2641 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL) 2642 sdev_printk(KERN_INFO, sdev, "No events found to cancel\n"); 2643 return 0; 2644 } 2645 2646 sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n"); 2647 2648 list_for_each_entry_safe(evt, temp, &cancelq, cancel) { 2649 wait_for_completion(&evt->comp); 2650 status = be16_to_cpu(evt->queue->cancel_rsp.mad_common.status); 2651 list_del(&evt->cancel); 2652 ibmvfc_free_event(evt); 2653 2654 if (status != IBMVFC_MAD_SUCCESS) { 2655 sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status); 2656 switch (status) { 2657 case IBMVFC_MAD_DRIVER_FAILED: 2658 case IBMVFC_MAD_CRQ_ERROR: 2659 /* Host adapter most likely going through reset, return success to 2660 * the caller will wait for the command being cancelled to get returned 2661 */ 2662 break; 2663 default: 2664 fail = 1; 2665 break; 2666 } 2667 } 2668 } 2669 2670 if (fail) 2671 return -EIO; 2672 2673 sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n"); 2674 LEAVE; 2675 return 0; 2676 } 2677 2678 static int ibmvfc_cancel_all_sq(struct scsi_device *sdev, int type) 2679 { 2680 struct ibmvfc_host *vhost = shost_priv(sdev->host); 2681 struct ibmvfc_event *evt, *found_evt; 2682 union ibmvfc_iu rsp; 2683 int rsp_rc = -EBUSY; 2684 unsigned long flags; 2685 u16 status; 2686 2687 ENTER; 2688 found_evt = NULL; 2689 spin_lock_irqsave(vhost->host->host_lock, flags); 2690 spin_lock(&vhost->crq.l_lock); 2691 list_for_each_entry(evt, &vhost->crq.sent, queue_list) { 2692 if (evt->cmnd && evt->cmnd->device == sdev) { 2693 found_evt = evt; 2694 break; 2695 } 2696 } 2697 spin_unlock(&vhost->crq.l_lock); 2698 2699 if (!found_evt) { 2700 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL) 2701 sdev_printk(KERN_INFO, sdev, "No events found to cancel\n"); 2702 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2703 return 0; 2704 } 2705 2706 if (vhost->logged_in) { 2707 evt = ibmvfc_init_tmf(&vhost->crq, sdev, type); 2708 evt->sync_iu = &rsp; 2709 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout); 2710 } 2711 2712 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2713 2714 if (rsp_rc != 0) { 2715 sdev_printk(KERN_ERR, sdev, "Failed to send cancel event. rc=%d\n", rsp_rc); 2716 /* If failure is received, the host adapter is most likely going 2717 through reset, return success so the caller will wait for the command 2718 being cancelled to get returned */ 2719 return 0; 2720 } 2721 2722 sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n"); 2723 2724 wait_for_completion(&evt->comp); 2725 status = be16_to_cpu(rsp.mad_common.status); 2726 spin_lock_irqsave(vhost->host->host_lock, flags); 2727 ibmvfc_free_event(evt); 2728 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2729 2730 if (status != IBMVFC_MAD_SUCCESS) { 2731 sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status); 2732 switch (status) { 2733 case IBMVFC_MAD_DRIVER_FAILED: 2734 case IBMVFC_MAD_CRQ_ERROR: 2735 /* Host adapter most likely going through reset, return success to 2736 the caller will wait for the command being cancelled to get returned */ 2737 return 0; 2738 default: 2739 return -EIO; 2740 }; 2741 } 2742 2743 sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n"); 2744 return 0; 2745 } 2746 2747 /** 2748 * ibmvfc_cancel_all - Cancel all outstanding commands to the device 2749 * @sdev: scsi device to cancel commands 2750 * @type: type of error recovery being performed 2751 * 2752 * This sends a cancel to the VIOS for the specified device. This does 2753 * NOT send any abort to the actual device. That must be done separately. 2754 * 2755 * Returns: 2756 * 0 on success / other on failure 2757 **/ 2758 static int ibmvfc_cancel_all(struct scsi_device *sdev, int type) 2759 { 2760 struct ibmvfc_host *vhost = shost_priv(sdev->host); 2761 2762 if (vhost->mq_enabled && vhost->using_channels) 2763 return ibmvfc_cancel_all_mq(sdev, type); 2764 else 2765 return ibmvfc_cancel_all_sq(sdev, type); 2766 } 2767 2768 /** 2769 * ibmvfc_match_key - Match function for specified cancel key 2770 * @evt: ibmvfc event struct 2771 * @key: cancel key to match 2772 * 2773 * Returns: 2774 * 1 if event matches key / 0 if event does not match key 2775 **/ 2776 static int ibmvfc_match_key(struct ibmvfc_event *evt, void *key) 2777 { 2778 unsigned long cancel_key = (unsigned long)key; 2779 2780 if (evt->crq.format == IBMVFC_CMD_FORMAT && 2781 be32_to_cpu(evt->iu.cmd.cancel_key) == cancel_key) 2782 return 1; 2783 return 0; 2784 } 2785 2786 /** 2787 * ibmvfc_match_evt - Match function for specified event 2788 * @evt: ibmvfc event struct 2789 * @match: event to match 2790 * 2791 * Returns: 2792 * 1 if event matches key / 0 if event does not match key 2793 **/ 2794 static int ibmvfc_match_evt(struct ibmvfc_event *evt, void *match) 2795 { 2796 if (evt == match) 2797 return 1; 2798 return 0; 2799 } 2800 2801 /** 2802 * ibmvfc_abort_task_set - Abort outstanding commands to the device 2803 * @sdev: scsi device to abort commands 2804 * 2805 * This sends an Abort Task Set to the VIOS for the specified device. This does 2806 * NOT send any cancel to the VIOS. That must be done separately. 2807 * 2808 * Returns: 2809 * 0 on success / other on failure 2810 **/ 2811 static int ibmvfc_abort_task_set(struct scsi_device *sdev) 2812 { 2813 struct ibmvfc_host *vhost = shost_priv(sdev->host); 2814 struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); 2815 struct ibmvfc_cmd *tmf; 2816 struct ibmvfc_event *evt, *found_evt; 2817 union ibmvfc_iu rsp_iu; 2818 struct ibmvfc_fcp_cmd_iu *iu; 2819 struct ibmvfc_fcp_rsp *fc_rsp = ibmvfc_get_fcp_rsp(vhost, &rsp_iu.cmd); 2820 int rc, rsp_rc = -EBUSY; 2821 unsigned long flags, timeout = IBMVFC_ABORT_TIMEOUT; 2822 int rsp_code = 0; 2823 2824 found_evt = NULL; 2825 spin_lock_irqsave(vhost->host->host_lock, flags); 2826 spin_lock(&vhost->crq.l_lock); 2827 list_for_each_entry(evt, &vhost->crq.sent, queue_list) { 2828 if (evt->cmnd && evt->cmnd->device == sdev) { 2829 found_evt = evt; 2830 break; 2831 } 2832 } 2833 spin_unlock(&vhost->crq.l_lock); 2834 2835 if (!found_evt) { 2836 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL) 2837 sdev_printk(KERN_INFO, sdev, "No events found to abort\n"); 2838 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2839 return 0; 2840 } 2841 2842 if (vhost->state == IBMVFC_ACTIVE) { 2843 evt = ibmvfc_get_event(&vhost->crq); 2844 if (!evt) { 2845 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2846 return -ENOMEM; 2847 } 2848 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT); 2849 tmf = ibmvfc_init_vfc_cmd(evt, sdev); 2850 iu = ibmvfc_get_fcp_iu(vhost, tmf); 2851 2852 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) 2853 tmf->target_wwpn = cpu_to_be64(rport->port_name); 2854 iu->tmf_flags = IBMVFC_ABORT_TASK_SET; 2855 tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF)); 2856 evt->sync_iu = &rsp_iu; 2857 2858 tmf->correlation = cpu_to_be64((u64)evt); 2859 2860 init_completion(&evt->comp); 2861 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout); 2862 } 2863 2864 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2865 2866 if (rsp_rc != 0) { 2867 sdev_printk(KERN_ERR, sdev, "Failed to send abort. rc=%d\n", rsp_rc); 2868 return -EIO; 2869 } 2870 2871 sdev_printk(KERN_INFO, sdev, "Aborting outstanding commands\n"); 2872 timeout = wait_for_completion_timeout(&evt->comp, timeout); 2873 2874 if (!timeout) { 2875 rc = ibmvfc_cancel_all(sdev, 0); 2876 if (!rc) { 2877 rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key); 2878 if (rc == SUCCESS) 2879 rc = 0; 2880 } 2881 2882 if (rc) { 2883 sdev_printk(KERN_INFO, sdev, "Cancel failed, resetting host\n"); 2884 ibmvfc_reset_host(vhost); 2885 rsp_rc = -EIO; 2886 rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key); 2887 2888 if (rc == SUCCESS) 2889 rsp_rc = 0; 2890 2891 rc = ibmvfc_wait_for_ops(vhost, evt, ibmvfc_match_evt); 2892 if (rc != SUCCESS) { 2893 spin_lock_irqsave(vhost->host->host_lock, flags); 2894 ibmvfc_hard_reset_host(vhost); 2895 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2896 rsp_rc = 0; 2897 } 2898 2899 goto out; 2900 } 2901 } 2902 2903 if (rsp_iu.cmd.status) 2904 rsp_code = ibmvfc_get_err_result(vhost, &rsp_iu.cmd); 2905 2906 if (rsp_code) { 2907 if (fc_rsp->flags & FCP_RSP_LEN_VALID) 2908 rsp_code = fc_rsp->data.info.rsp_code; 2909 2910 sdev_printk(KERN_ERR, sdev, "Abort failed: %s (%x:%x) " 2911 "flags: %x fcp_rsp: %x, scsi_status: %x\n", 2912 ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)), 2913 be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error), fc_rsp->flags, rsp_code, 2914 fc_rsp->scsi_status); 2915 rsp_rc = -EIO; 2916 } else 2917 sdev_printk(KERN_INFO, sdev, "Abort successful\n"); 2918 2919 out: 2920 spin_lock_irqsave(vhost->host->host_lock, flags); 2921 ibmvfc_free_event(evt); 2922 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2923 return rsp_rc; 2924 } 2925 2926 /** 2927 * ibmvfc_eh_abort_handler - Abort a command 2928 * @cmd: scsi command to abort 2929 * 2930 * Returns: 2931 * SUCCESS / FAST_IO_FAIL / FAILED 2932 **/ 2933 static int ibmvfc_eh_abort_handler(struct scsi_cmnd *cmd) 2934 { 2935 struct scsi_device *sdev = cmd->device; 2936 struct ibmvfc_host *vhost = shost_priv(sdev->host); 2937 int cancel_rc, block_rc; 2938 int rc = FAILED; 2939 2940 ENTER; 2941 block_rc = fc_block_scsi_eh(cmd); 2942 ibmvfc_wait_while_resetting(vhost); 2943 if (block_rc != FAST_IO_FAIL) { 2944 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET); 2945 ibmvfc_abort_task_set(sdev); 2946 } else 2947 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS); 2948 2949 if (!cancel_rc) 2950 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun); 2951 2952 if (block_rc == FAST_IO_FAIL && rc != FAILED) 2953 rc = FAST_IO_FAIL; 2954 2955 LEAVE; 2956 return rc; 2957 } 2958 2959 /** 2960 * ibmvfc_eh_device_reset_handler - Reset a single LUN 2961 * @cmd: scsi command struct 2962 * 2963 * Returns: 2964 * SUCCESS / FAST_IO_FAIL / FAILED 2965 **/ 2966 static int ibmvfc_eh_device_reset_handler(struct scsi_cmnd *cmd) 2967 { 2968 struct scsi_device *sdev = cmd->device; 2969 struct ibmvfc_host *vhost = shost_priv(sdev->host); 2970 int cancel_rc, block_rc, reset_rc = 0; 2971 int rc = FAILED; 2972 2973 ENTER; 2974 block_rc = fc_block_scsi_eh(cmd); 2975 ibmvfc_wait_while_resetting(vhost); 2976 if (block_rc != FAST_IO_FAIL) { 2977 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_LUN_RESET); 2978 reset_rc = ibmvfc_reset_device(sdev, IBMVFC_LUN_RESET, "LUN"); 2979 } else 2980 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS); 2981 2982 if (!cancel_rc && !reset_rc) 2983 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun); 2984 2985 if (block_rc == FAST_IO_FAIL && rc != FAILED) 2986 rc = FAST_IO_FAIL; 2987 2988 LEAVE; 2989 return rc; 2990 } 2991 2992 /** 2993 * ibmvfc_dev_cancel_all_noreset - Device iterated cancel all function 2994 * @sdev: scsi device struct 2995 * @data: return code 2996 * 2997 **/ 2998 static void ibmvfc_dev_cancel_all_noreset(struct scsi_device *sdev, void *data) 2999 { 3000 unsigned long *rc = data; 3001 *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS); 3002 } 3003 3004 /** 3005 * ibmvfc_eh_target_reset_handler - Reset the target 3006 * @cmd: scsi command struct 3007 * 3008 * Returns: 3009 * SUCCESS / FAST_IO_FAIL / FAILED 3010 **/ 3011 static int ibmvfc_eh_target_reset_handler(struct scsi_cmnd *cmd) 3012 { 3013 struct scsi_target *starget = scsi_target(cmd->device); 3014 struct fc_rport *rport = starget_to_rport(starget); 3015 struct Scsi_Host *shost = rport_to_shost(rport); 3016 struct ibmvfc_host *vhost = shost_priv(shost); 3017 int block_rc; 3018 int reset_rc = 0; 3019 int rc = FAILED; 3020 unsigned long cancel_rc = 0; 3021 bool tgt_reset = false; 3022 3023 ENTER; 3024 block_rc = fc_block_rport(rport); 3025 ibmvfc_wait_while_resetting(vhost); 3026 if (block_rc != FAST_IO_FAIL) { 3027 struct scsi_device *sdev; 3028 3029 shost_for_each_device(sdev, shost) { 3030 if ((sdev->channel != starget->channel) || 3031 (sdev->id != starget->id)) 3032 continue; 3033 3034 cancel_rc |= ibmvfc_cancel_all(sdev, 3035 IBMVFC_TMF_TGT_RESET); 3036 if (!tgt_reset) { 3037 reset_rc = ibmvfc_reset_device(sdev, 3038 IBMVFC_TARGET_RESET, "target"); 3039 tgt_reset = true; 3040 } 3041 } 3042 } else 3043 starget_for_each_device(starget, &cancel_rc, 3044 ibmvfc_dev_cancel_all_noreset); 3045 3046 if (!cancel_rc && !reset_rc) 3047 rc = ibmvfc_wait_for_ops(vhost, starget, ibmvfc_match_target); 3048 3049 if (block_rc == FAST_IO_FAIL && rc != FAILED) 3050 rc = FAST_IO_FAIL; 3051 3052 LEAVE; 3053 return rc; 3054 } 3055 3056 /** 3057 * ibmvfc_eh_host_reset_handler - Reset the connection to the server 3058 * @cmd: struct scsi_cmnd having problems 3059 * 3060 **/ 3061 static int ibmvfc_eh_host_reset_handler(struct scsi_cmnd *cmd) 3062 { 3063 int rc; 3064 struct ibmvfc_host *vhost = shost_priv(cmd->device->host); 3065 3066 dev_err(vhost->dev, "Resetting connection due to error recovery\n"); 3067 rc = ibmvfc_issue_fc_host_lip(vhost->host); 3068 3069 return rc ? FAILED : SUCCESS; 3070 } 3071 3072 /** 3073 * ibmvfc_terminate_rport_io - Terminate all pending I/O to the rport. 3074 * @rport: rport struct 3075 * 3076 * Return value: 3077 * none 3078 **/ 3079 static void ibmvfc_terminate_rport_io(struct fc_rport *rport) 3080 { 3081 struct Scsi_Host *shost = rport_to_shost(rport); 3082 struct ibmvfc_host *vhost = shost_priv(shost); 3083 struct fc_rport *dev_rport; 3084 struct scsi_device *sdev; 3085 struct ibmvfc_target *tgt; 3086 unsigned long rc, flags; 3087 unsigned int found; 3088 3089 ENTER; 3090 shost_for_each_device(sdev, shost) { 3091 dev_rport = starget_to_rport(scsi_target(sdev)); 3092 if (dev_rport != rport) 3093 continue; 3094 ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS); 3095 } 3096 3097 rc = ibmvfc_wait_for_ops(vhost, rport, ibmvfc_match_rport); 3098 3099 if (rc == FAILED) 3100 ibmvfc_issue_fc_host_lip(shost); 3101 3102 spin_lock_irqsave(shost->host_lock, flags); 3103 found = 0; 3104 list_for_each_entry(tgt, &vhost->targets, queue) { 3105 if (tgt->scsi_id == rport->port_id) { 3106 found++; 3107 break; 3108 } 3109 } 3110 3111 if (found && tgt->action == IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT) { 3112 /* 3113 * If we get here, that means we previously attempted to send 3114 * an implicit logout to the target but it failed, most likely 3115 * due to I/O being pending, so we need to send it again 3116 */ 3117 ibmvfc_del_tgt(tgt); 3118 ibmvfc_reinit_host(vhost); 3119 } 3120 3121 spin_unlock_irqrestore(shost->host_lock, flags); 3122 LEAVE; 3123 } 3124 3125 static const struct ibmvfc_async_desc ae_desc [] = { 3126 { "PLOGI", IBMVFC_AE_ELS_PLOGI, IBMVFC_DEFAULT_LOG_LEVEL + 1 }, 3127 { "LOGO", IBMVFC_AE_ELS_LOGO, IBMVFC_DEFAULT_LOG_LEVEL + 1 }, 3128 { "PRLO", IBMVFC_AE_ELS_PRLO, IBMVFC_DEFAULT_LOG_LEVEL + 1 }, 3129 { "N-Port SCN", IBMVFC_AE_SCN_NPORT, IBMVFC_DEFAULT_LOG_LEVEL + 1 }, 3130 { "Group SCN", IBMVFC_AE_SCN_GROUP, IBMVFC_DEFAULT_LOG_LEVEL + 1 }, 3131 { "Domain SCN", IBMVFC_AE_SCN_DOMAIN, IBMVFC_DEFAULT_LOG_LEVEL }, 3132 { "Fabric SCN", IBMVFC_AE_SCN_FABRIC, IBMVFC_DEFAULT_LOG_LEVEL }, 3133 { "Link Up", IBMVFC_AE_LINK_UP, IBMVFC_DEFAULT_LOG_LEVEL }, 3134 { "Link Down", IBMVFC_AE_LINK_DOWN, IBMVFC_DEFAULT_LOG_LEVEL }, 3135 { "Link Dead", IBMVFC_AE_LINK_DEAD, IBMVFC_DEFAULT_LOG_LEVEL }, 3136 { "Halt", IBMVFC_AE_HALT, IBMVFC_DEFAULT_LOG_LEVEL }, 3137 { "Resume", IBMVFC_AE_RESUME, IBMVFC_DEFAULT_LOG_LEVEL }, 3138 { "Adapter Failed", IBMVFC_AE_ADAPTER_FAILED, IBMVFC_DEFAULT_LOG_LEVEL }, 3139 }; 3140 3141 static const struct ibmvfc_async_desc unknown_ae = { 3142 "Unknown async", 0, IBMVFC_DEFAULT_LOG_LEVEL 3143 }; 3144 3145 /** 3146 * ibmvfc_get_ae_desc - Get text description for async event 3147 * @ae: async event 3148 * 3149 **/ 3150 static const struct ibmvfc_async_desc *ibmvfc_get_ae_desc(u64 ae) 3151 { 3152 int i; 3153 3154 for (i = 0; i < ARRAY_SIZE(ae_desc); i++) 3155 if (ae_desc[i].ae == ae) 3156 return &ae_desc[i]; 3157 3158 return &unknown_ae; 3159 } 3160 3161 static const struct { 3162 enum ibmvfc_ae_link_state state; 3163 const char *desc; 3164 } link_desc [] = { 3165 { IBMVFC_AE_LS_LINK_UP, " link up" }, 3166 { IBMVFC_AE_LS_LINK_BOUNCED, " link bounced" }, 3167 { IBMVFC_AE_LS_LINK_DOWN, " link down" }, 3168 { IBMVFC_AE_LS_LINK_DEAD, " link dead" }, 3169 }; 3170 3171 /** 3172 * ibmvfc_get_link_state - Get text description for link state 3173 * @state: link state 3174 * 3175 **/ 3176 static const char *ibmvfc_get_link_state(enum ibmvfc_ae_link_state state) 3177 { 3178 int i; 3179 3180 for (i = 0; i < ARRAY_SIZE(link_desc); i++) 3181 if (link_desc[i].state == state) 3182 return link_desc[i].desc; 3183 3184 return ""; 3185 } 3186 3187 /** 3188 * ibmvfc_handle_async - Handle an async event from the adapter 3189 * @crq: crq to process 3190 * @vhost: ibmvfc host struct 3191 * 3192 **/ 3193 static void ibmvfc_handle_async(struct ibmvfc_async_crq *crq, 3194 struct ibmvfc_host *vhost) 3195 { 3196 const struct ibmvfc_async_desc *desc = ibmvfc_get_ae_desc(be64_to_cpu(crq->event)); 3197 struct ibmvfc_target *tgt; 3198 3199 ibmvfc_log(vhost, desc->log_level, "%s event received. scsi_id: %llx, wwpn: %llx," 3200 " node_name: %llx%s\n", desc->desc, be64_to_cpu(crq->scsi_id), 3201 be64_to_cpu(crq->wwpn), be64_to_cpu(crq->node_name), 3202 ibmvfc_get_link_state(crq->link_state)); 3203 3204 switch (be64_to_cpu(crq->event)) { 3205 case IBMVFC_AE_RESUME: 3206 switch (crq->link_state) { 3207 case IBMVFC_AE_LS_LINK_DOWN: 3208 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN); 3209 break; 3210 case IBMVFC_AE_LS_LINK_DEAD: 3211 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 3212 break; 3213 case IBMVFC_AE_LS_LINK_UP: 3214 case IBMVFC_AE_LS_LINK_BOUNCED: 3215 default: 3216 vhost->events_to_log |= IBMVFC_AE_LINKUP; 3217 vhost->delay_init = 1; 3218 __ibmvfc_reset_host(vhost); 3219 break; 3220 } 3221 3222 break; 3223 case IBMVFC_AE_LINK_UP: 3224 vhost->events_to_log |= IBMVFC_AE_LINKUP; 3225 vhost->delay_init = 1; 3226 __ibmvfc_reset_host(vhost); 3227 break; 3228 case IBMVFC_AE_SCN_FABRIC: 3229 case IBMVFC_AE_SCN_DOMAIN: 3230 vhost->events_to_log |= IBMVFC_AE_RSCN; 3231 if (vhost->state < IBMVFC_HALTED) { 3232 vhost->delay_init = 1; 3233 __ibmvfc_reset_host(vhost); 3234 } 3235 break; 3236 case IBMVFC_AE_SCN_NPORT: 3237 case IBMVFC_AE_SCN_GROUP: 3238 vhost->events_to_log |= IBMVFC_AE_RSCN; 3239 ibmvfc_reinit_host(vhost); 3240 break; 3241 case IBMVFC_AE_ELS_LOGO: 3242 case IBMVFC_AE_ELS_PRLO: 3243 case IBMVFC_AE_ELS_PLOGI: 3244 list_for_each_entry(tgt, &vhost->targets, queue) { 3245 if (!crq->scsi_id && !crq->wwpn && !crq->node_name) 3246 break; 3247 if (crq->scsi_id && cpu_to_be64(tgt->scsi_id) != crq->scsi_id) 3248 continue; 3249 if (crq->wwpn && cpu_to_be64(tgt->ids.port_name) != crq->wwpn) 3250 continue; 3251 if (crq->node_name && cpu_to_be64(tgt->ids.node_name) != crq->node_name) 3252 continue; 3253 if (tgt->need_login && be64_to_cpu(crq->event) == IBMVFC_AE_ELS_LOGO) 3254 tgt->logo_rcvd = 1; 3255 if (!tgt->need_login || be64_to_cpu(crq->event) == IBMVFC_AE_ELS_PLOGI) { 3256 ibmvfc_del_tgt(tgt); 3257 ibmvfc_reinit_host(vhost); 3258 } 3259 } 3260 break; 3261 case IBMVFC_AE_LINK_DOWN: 3262 case IBMVFC_AE_ADAPTER_FAILED: 3263 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN); 3264 break; 3265 case IBMVFC_AE_LINK_DEAD: 3266 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 3267 break; 3268 case IBMVFC_AE_HALT: 3269 ibmvfc_link_down(vhost, IBMVFC_HALTED); 3270 break; 3271 default: 3272 dev_err(vhost->dev, "Unknown async event received: %lld\n", crq->event); 3273 break; 3274 } 3275 } 3276 3277 /** 3278 * ibmvfc_handle_crq - Handles and frees received events in the CRQ 3279 * @crq: Command/Response queue 3280 * @vhost: ibmvfc host struct 3281 * @evt_doneq: Event done queue 3282 * 3283 **/ 3284 static void ibmvfc_handle_crq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost, 3285 struct list_head *evt_doneq) 3286 { 3287 long rc; 3288 struct ibmvfc_event *evt = (struct ibmvfc_event *)be64_to_cpu(crq->ioba); 3289 3290 switch (crq->valid) { 3291 case IBMVFC_CRQ_INIT_RSP: 3292 switch (crq->format) { 3293 case IBMVFC_CRQ_INIT: 3294 dev_info(vhost->dev, "Partner initialized\n"); 3295 /* Send back a response */ 3296 rc = ibmvfc_send_crq_init_complete(vhost); 3297 if (rc == 0) 3298 ibmvfc_init_host(vhost); 3299 else 3300 dev_err(vhost->dev, "Unable to send init rsp. rc=%ld\n", rc); 3301 break; 3302 case IBMVFC_CRQ_INIT_COMPLETE: 3303 dev_info(vhost->dev, "Partner initialization complete\n"); 3304 ibmvfc_init_host(vhost); 3305 break; 3306 default: 3307 dev_err(vhost->dev, "Unknown crq message type: %d\n", crq->format); 3308 } 3309 return; 3310 case IBMVFC_CRQ_XPORT_EVENT: 3311 vhost->state = IBMVFC_NO_CRQ; 3312 vhost->logged_in = 0; 3313 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE); 3314 if (crq->format == IBMVFC_PARTITION_MIGRATED) { 3315 /* We need to re-setup the interpartition connection */ 3316 dev_info(vhost->dev, "Partition migrated, Re-enabling adapter\n"); 3317 vhost->client_migrated = 1; 3318 3319 scsi_block_requests(vhost->host); 3320 ibmvfc_purge_requests(vhost, DID_REQUEUE); 3321 ibmvfc_set_host_state(vhost, IBMVFC_LINK_DOWN); 3322 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_REENABLE); 3323 wake_up(&vhost->work_wait_q); 3324 } else if (crq->format == IBMVFC_PARTNER_FAILED || crq->format == IBMVFC_PARTNER_DEREGISTER) { 3325 dev_err(vhost->dev, "Host partner adapter deregistered or failed (rc=%d)\n", crq->format); 3326 ibmvfc_purge_requests(vhost, DID_ERROR); 3327 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN); 3328 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET); 3329 } else { 3330 dev_err(vhost->dev, "Received unknown transport event from partner (rc=%d)\n", crq->format); 3331 } 3332 return; 3333 case IBMVFC_CRQ_CMD_RSP: 3334 break; 3335 default: 3336 dev_err(vhost->dev, "Got an invalid message type 0x%02x\n", crq->valid); 3337 return; 3338 } 3339 3340 if (crq->format == IBMVFC_ASYNC_EVENT) 3341 return; 3342 3343 /* The only kind of payload CRQs we should get are responses to 3344 * things we send. Make sure this response is to something we 3345 * actually sent 3346 */ 3347 if (unlikely(!ibmvfc_valid_event(&vhost->crq.evt_pool, evt))) { 3348 dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n", 3349 crq->ioba); 3350 return; 3351 } 3352 3353 if (unlikely(atomic_dec_if_positive(&evt->active))) { 3354 dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n", 3355 crq->ioba); 3356 return; 3357 } 3358 3359 spin_lock(&evt->queue->l_lock); 3360 list_move_tail(&evt->queue_list, evt_doneq); 3361 spin_unlock(&evt->queue->l_lock); 3362 } 3363 3364 /** 3365 * ibmvfc_scan_finished - Check if the device scan is done. 3366 * @shost: scsi host struct 3367 * @time: current elapsed time 3368 * 3369 * Returns: 3370 * 0 if scan is not done / 1 if scan is done 3371 **/ 3372 static int ibmvfc_scan_finished(struct Scsi_Host *shost, unsigned long time) 3373 { 3374 unsigned long flags; 3375 struct ibmvfc_host *vhost = shost_priv(shost); 3376 int done = 0; 3377 3378 spin_lock_irqsave(shost->host_lock, flags); 3379 if (!vhost->scan_timeout) 3380 done = 1; 3381 else if (time >= (vhost->scan_timeout * HZ)) { 3382 dev_info(vhost->dev, "Scan taking longer than %d seconds, " 3383 "continuing initialization\n", vhost->scan_timeout); 3384 done = 1; 3385 } 3386 3387 if (vhost->scan_complete) { 3388 vhost->scan_timeout = init_timeout; 3389 done = 1; 3390 } 3391 spin_unlock_irqrestore(shost->host_lock, flags); 3392 return done; 3393 } 3394 3395 /** 3396 * ibmvfc_slave_alloc - Setup the device's task set value 3397 * @sdev: struct scsi_device device to configure 3398 * 3399 * Set the device's task set value so that error handling works as 3400 * expected. 3401 * 3402 * Returns: 3403 * 0 on success / -ENXIO if device does not exist 3404 **/ 3405 static int ibmvfc_slave_alloc(struct scsi_device *sdev) 3406 { 3407 struct Scsi_Host *shost = sdev->host; 3408 struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); 3409 struct ibmvfc_host *vhost = shost_priv(shost); 3410 unsigned long flags = 0; 3411 3412 if (!rport || fc_remote_port_chkready(rport)) 3413 return -ENXIO; 3414 3415 spin_lock_irqsave(shost->host_lock, flags); 3416 sdev->hostdata = (void *)(unsigned long)vhost->task_set++; 3417 spin_unlock_irqrestore(shost->host_lock, flags); 3418 return 0; 3419 } 3420 3421 /** 3422 * ibmvfc_target_alloc - Setup the target's task set value 3423 * @starget: struct scsi_target 3424 * 3425 * Set the target's task set value so that error handling works as 3426 * expected. 3427 * 3428 * Returns: 3429 * 0 on success / -ENXIO if device does not exist 3430 **/ 3431 static int ibmvfc_target_alloc(struct scsi_target *starget) 3432 { 3433 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 3434 struct ibmvfc_host *vhost = shost_priv(shost); 3435 unsigned long flags = 0; 3436 3437 spin_lock_irqsave(shost->host_lock, flags); 3438 starget->hostdata = (void *)(unsigned long)vhost->task_set++; 3439 spin_unlock_irqrestore(shost->host_lock, flags); 3440 return 0; 3441 } 3442 3443 /** 3444 * ibmvfc_slave_configure - Configure the device 3445 * @sdev: struct scsi_device device to configure 3446 * 3447 * Enable allow_restart for a device if it is a disk. Adjust the 3448 * queue_depth here also. 3449 * 3450 * Returns: 3451 * 0 3452 **/ 3453 static int ibmvfc_slave_configure(struct scsi_device *sdev) 3454 { 3455 struct Scsi_Host *shost = sdev->host; 3456 unsigned long flags = 0; 3457 3458 spin_lock_irqsave(shost->host_lock, flags); 3459 if (sdev->type == TYPE_DISK) { 3460 sdev->allow_restart = 1; 3461 blk_queue_rq_timeout(sdev->request_queue, 120 * HZ); 3462 } 3463 spin_unlock_irqrestore(shost->host_lock, flags); 3464 return 0; 3465 } 3466 3467 /** 3468 * ibmvfc_change_queue_depth - Change the device's queue depth 3469 * @sdev: scsi device struct 3470 * @qdepth: depth to set 3471 * 3472 * Return value: 3473 * actual depth set 3474 **/ 3475 static int ibmvfc_change_queue_depth(struct scsi_device *sdev, int qdepth) 3476 { 3477 if (qdepth > IBMVFC_MAX_CMDS_PER_LUN) 3478 qdepth = IBMVFC_MAX_CMDS_PER_LUN; 3479 3480 return scsi_change_queue_depth(sdev, qdepth); 3481 } 3482 3483 static ssize_t ibmvfc_show_host_partition_name(struct device *dev, 3484 struct device_attribute *attr, char *buf) 3485 { 3486 struct Scsi_Host *shost = class_to_shost(dev); 3487 struct ibmvfc_host *vhost = shost_priv(shost); 3488 3489 return sysfs_emit(buf, "%s\n", vhost->login_buf->resp.partition_name); 3490 } 3491 3492 static ssize_t ibmvfc_show_host_device_name(struct device *dev, 3493 struct device_attribute *attr, char *buf) 3494 { 3495 struct Scsi_Host *shost = class_to_shost(dev); 3496 struct ibmvfc_host *vhost = shost_priv(shost); 3497 3498 return sysfs_emit(buf, "%s\n", vhost->login_buf->resp.device_name); 3499 } 3500 3501 static ssize_t ibmvfc_show_host_loc_code(struct device *dev, 3502 struct device_attribute *attr, char *buf) 3503 { 3504 struct Scsi_Host *shost = class_to_shost(dev); 3505 struct ibmvfc_host *vhost = shost_priv(shost); 3506 3507 return sysfs_emit(buf, "%s\n", vhost->login_buf->resp.port_loc_code); 3508 } 3509 3510 static ssize_t ibmvfc_show_host_drc_name(struct device *dev, 3511 struct device_attribute *attr, char *buf) 3512 { 3513 struct Scsi_Host *shost = class_to_shost(dev); 3514 struct ibmvfc_host *vhost = shost_priv(shost); 3515 3516 return sysfs_emit(buf, "%s\n", vhost->login_buf->resp.drc_name); 3517 } 3518 3519 static 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 sysfs_emit(buf, "%d\n", 3525 be32_to_cpu(vhost->login_buf->resp.version)); 3526 } 3527 3528 static ssize_t ibmvfc_show_host_capabilities(struct device *dev, 3529 struct device_attribute *attr, char *buf) 3530 { 3531 struct Scsi_Host *shost = class_to_shost(dev); 3532 struct ibmvfc_host *vhost = shost_priv(shost); 3533 return sysfs_emit(buf, "%llx\n", 3534 be64_to_cpu(vhost->login_buf->resp.capabilities)); 3535 } 3536 3537 /** 3538 * ibmvfc_show_log_level - Show the adapter's error logging level 3539 * @dev: class device struct 3540 * @attr: unused 3541 * @buf: buffer 3542 * 3543 * Return value: 3544 * number of bytes printed to buffer 3545 **/ 3546 static ssize_t ibmvfc_show_log_level(struct device *dev, 3547 struct device_attribute *attr, char *buf) 3548 { 3549 struct Scsi_Host *shost = class_to_shost(dev); 3550 struct ibmvfc_host *vhost = shost_priv(shost); 3551 unsigned long flags = 0; 3552 int len; 3553 3554 spin_lock_irqsave(shost->host_lock, flags); 3555 len = sysfs_emit(buf, "%d\n", vhost->log_level); 3556 spin_unlock_irqrestore(shost->host_lock, flags); 3557 return len; 3558 } 3559 3560 /** 3561 * ibmvfc_store_log_level - Change the adapter's error logging level 3562 * @dev: class device struct 3563 * @attr: unused 3564 * @buf: buffer 3565 * @count: buffer size 3566 * 3567 * Return value: 3568 * number of bytes printed to buffer 3569 **/ 3570 static ssize_t ibmvfc_store_log_level(struct device *dev, 3571 struct device_attribute *attr, 3572 const char *buf, size_t count) 3573 { 3574 struct Scsi_Host *shost = class_to_shost(dev); 3575 struct ibmvfc_host *vhost = shost_priv(shost); 3576 unsigned long flags = 0; 3577 3578 spin_lock_irqsave(shost->host_lock, flags); 3579 vhost->log_level = simple_strtoul(buf, NULL, 10); 3580 spin_unlock_irqrestore(shost->host_lock, flags); 3581 return strlen(buf); 3582 } 3583 3584 static ssize_t ibmvfc_show_scsi_channels(struct device *dev, 3585 struct device_attribute *attr, char *buf) 3586 { 3587 struct Scsi_Host *shost = class_to_shost(dev); 3588 struct ibmvfc_host *vhost = shost_priv(shost); 3589 struct ibmvfc_channels *scsi = &vhost->scsi_scrqs; 3590 unsigned long flags = 0; 3591 int len; 3592 3593 spin_lock_irqsave(shost->host_lock, flags); 3594 len = sysfs_emit(buf, "%d\n", scsi->desired_queues); 3595 spin_unlock_irqrestore(shost->host_lock, flags); 3596 return len; 3597 } 3598 3599 static ssize_t ibmvfc_store_scsi_channels(struct device *dev, 3600 struct device_attribute *attr, 3601 const char *buf, size_t count) 3602 { 3603 struct Scsi_Host *shost = class_to_shost(dev); 3604 struct ibmvfc_host *vhost = shost_priv(shost); 3605 struct ibmvfc_channels *scsi = &vhost->scsi_scrqs; 3606 unsigned long flags = 0; 3607 unsigned int channels; 3608 3609 spin_lock_irqsave(shost->host_lock, flags); 3610 channels = simple_strtoul(buf, NULL, 10); 3611 scsi->desired_queues = min(channels, shost->nr_hw_queues); 3612 ibmvfc_hard_reset_host(vhost); 3613 spin_unlock_irqrestore(shost->host_lock, flags); 3614 return strlen(buf); 3615 } 3616 3617 static DEVICE_ATTR(partition_name, S_IRUGO, ibmvfc_show_host_partition_name, NULL); 3618 static DEVICE_ATTR(device_name, S_IRUGO, ibmvfc_show_host_device_name, NULL); 3619 static DEVICE_ATTR(port_loc_code, S_IRUGO, ibmvfc_show_host_loc_code, NULL); 3620 static DEVICE_ATTR(drc_name, S_IRUGO, ibmvfc_show_host_drc_name, NULL); 3621 static DEVICE_ATTR(npiv_version, S_IRUGO, ibmvfc_show_host_npiv_version, NULL); 3622 static DEVICE_ATTR(capabilities, S_IRUGO, ibmvfc_show_host_capabilities, NULL); 3623 static DEVICE_ATTR(log_level, S_IRUGO | S_IWUSR, 3624 ibmvfc_show_log_level, ibmvfc_store_log_level); 3625 static DEVICE_ATTR(nr_scsi_channels, S_IRUGO | S_IWUSR, 3626 ibmvfc_show_scsi_channels, ibmvfc_store_scsi_channels); 3627 3628 #ifdef CONFIG_SCSI_IBMVFC_TRACE 3629 /** 3630 * ibmvfc_read_trace - Dump the adapter trace 3631 * @filp: open sysfs file 3632 * @kobj: kobject struct 3633 * @bin_attr: bin_attribute struct 3634 * @buf: buffer 3635 * @off: offset 3636 * @count: buffer size 3637 * 3638 * Return value: 3639 * number of bytes printed to buffer 3640 **/ 3641 static ssize_t ibmvfc_read_trace(struct file *filp, struct kobject *kobj, 3642 struct bin_attribute *bin_attr, 3643 char *buf, loff_t off, size_t count) 3644 { 3645 struct device *dev = kobj_to_dev(kobj); 3646 struct Scsi_Host *shost = class_to_shost(dev); 3647 struct ibmvfc_host *vhost = shost_priv(shost); 3648 unsigned long flags = 0; 3649 int size = IBMVFC_TRACE_SIZE; 3650 char *src = (char *)vhost->trace; 3651 3652 if (off > size) 3653 return 0; 3654 if (off + count > size) { 3655 size -= off; 3656 count = size; 3657 } 3658 3659 spin_lock_irqsave(shost->host_lock, flags); 3660 memcpy(buf, &src[off], count); 3661 spin_unlock_irqrestore(shost->host_lock, flags); 3662 return count; 3663 } 3664 3665 static struct bin_attribute ibmvfc_trace_attr = { 3666 .attr = { 3667 .name = "trace", 3668 .mode = S_IRUGO, 3669 }, 3670 .size = 0, 3671 .read = ibmvfc_read_trace, 3672 }; 3673 #endif 3674 3675 static struct attribute *ibmvfc_host_attrs[] = { 3676 &dev_attr_partition_name.attr, 3677 &dev_attr_device_name.attr, 3678 &dev_attr_port_loc_code.attr, 3679 &dev_attr_drc_name.attr, 3680 &dev_attr_npiv_version.attr, 3681 &dev_attr_capabilities.attr, 3682 &dev_attr_log_level.attr, 3683 &dev_attr_nr_scsi_channels.attr, 3684 NULL 3685 }; 3686 3687 ATTRIBUTE_GROUPS(ibmvfc_host); 3688 3689 static const struct scsi_host_template driver_template = { 3690 .module = THIS_MODULE, 3691 .name = "IBM POWER Virtual FC Adapter", 3692 .proc_name = IBMVFC_NAME, 3693 .queuecommand = ibmvfc_queuecommand, 3694 .eh_timed_out = fc_eh_timed_out, 3695 .eh_abort_handler = ibmvfc_eh_abort_handler, 3696 .eh_device_reset_handler = ibmvfc_eh_device_reset_handler, 3697 .eh_target_reset_handler = ibmvfc_eh_target_reset_handler, 3698 .eh_host_reset_handler = ibmvfc_eh_host_reset_handler, 3699 .slave_alloc = ibmvfc_slave_alloc, 3700 .slave_configure = ibmvfc_slave_configure, 3701 .target_alloc = ibmvfc_target_alloc, 3702 .scan_finished = ibmvfc_scan_finished, 3703 .change_queue_depth = ibmvfc_change_queue_depth, 3704 .cmd_per_lun = 16, 3705 .can_queue = IBMVFC_MAX_REQUESTS_DEFAULT, 3706 .this_id = -1, 3707 .sg_tablesize = SG_ALL, 3708 .max_sectors = IBMVFC_MAX_SECTORS, 3709 .shost_groups = ibmvfc_host_groups, 3710 .track_queue_depth = 1, 3711 }; 3712 3713 /** 3714 * ibmvfc_next_async_crq - Returns the next entry in async queue 3715 * @vhost: ibmvfc host struct 3716 * 3717 * Returns: 3718 * Pointer to next entry in queue / NULL if empty 3719 **/ 3720 static struct ibmvfc_async_crq *ibmvfc_next_async_crq(struct ibmvfc_host *vhost) 3721 { 3722 struct ibmvfc_queue *async_crq = &vhost->async_crq; 3723 struct ibmvfc_async_crq *crq; 3724 3725 crq = &async_crq->msgs.async[async_crq->cur]; 3726 if (crq->valid & 0x80) { 3727 if (++async_crq->cur == async_crq->size) 3728 async_crq->cur = 0; 3729 rmb(); 3730 } else 3731 crq = NULL; 3732 3733 return crq; 3734 } 3735 3736 /** 3737 * ibmvfc_next_crq - Returns the next entry in message queue 3738 * @vhost: ibmvfc host struct 3739 * 3740 * Returns: 3741 * Pointer to next entry in queue / NULL if empty 3742 **/ 3743 static struct ibmvfc_crq *ibmvfc_next_crq(struct ibmvfc_host *vhost) 3744 { 3745 struct ibmvfc_queue *queue = &vhost->crq; 3746 struct ibmvfc_crq *crq; 3747 3748 crq = &queue->msgs.crq[queue->cur]; 3749 if (crq->valid & 0x80) { 3750 if (++queue->cur == queue->size) 3751 queue->cur = 0; 3752 rmb(); 3753 } else 3754 crq = NULL; 3755 3756 return crq; 3757 } 3758 3759 /** 3760 * ibmvfc_interrupt - Interrupt handler 3761 * @irq: number of irq to handle, not used 3762 * @dev_instance: ibmvfc_host that received interrupt 3763 * 3764 * Returns: 3765 * IRQ_HANDLED 3766 **/ 3767 static irqreturn_t ibmvfc_interrupt(int irq, void *dev_instance) 3768 { 3769 struct ibmvfc_host *vhost = (struct ibmvfc_host *)dev_instance; 3770 unsigned long flags; 3771 3772 spin_lock_irqsave(vhost->host->host_lock, flags); 3773 vio_disable_interrupts(to_vio_dev(vhost->dev)); 3774 tasklet_schedule(&vhost->tasklet); 3775 spin_unlock_irqrestore(vhost->host->host_lock, flags); 3776 return IRQ_HANDLED; 3777 } 3778 3779 /** 3780 * ibmvfc_tasklet - Interrupt handler tasklet 3781 * @data: ibmvfc host struct 3782 * 3783 * Returns: 3784 * Nothing 3785 **/ 3786 static void ibmvfc_tasklet(void *data) 3787 { 3788 struct ibmvfc_host *vhost = data; 3789 struct vio_dev *vdev = to_vio_dev(vhost->dev); 3790 struct ibmvfc_crq *crq; 3791 struct ibmvfc_async_crq *async; 3792 struct ibmvfc_event *evt, *temp; 3793 unsigned long flags; 3794 int done = 0; 3795 LIST_HEAD(evt_doneq); 3796 3797 spin_lock_irqsave(vhost->host->host_lock, flags); 3798 spin_lock(vhost->crq.q_lock); 3799 while (!done) { 3800 /* Pull all the valid messages off the async CRQ */ 3801 while ((async = ibmvfc_next_async_crq(vhost)) != NULL) { 3802 ibmvfc_handle_async(async, vhost); 3803 async->valid = 0; 3804 wmb(); 3805 } 3806 3807 /* Pull all the valid messages off the CRQ */ 3808 while ((crq = ibmvfc_next_crq(vhost)) != NULL) { 3809 ibmvfc_handle_crq(crq, vhost, &evt_doneq); 3810 crq->valid = 0; 3811 wmb(); 3812 } 3813 3814 vio_enable_interrupts(vdev); 3815 if ((async = ibmvfc_next_async_crq(vhost)) != NULL) { 3816 vio_disable_interrupts(vdev); 3817 ibmvfc_handle_async(async, vhost); 3818 async->valid = 0; 3819 wmb(); 3820 } else if ((crq = ibmvfc_next_crq(vhost)) != NULL) { 3821 vio_disable_interrupts(vdev); 3822 ibmvfc_handle_crq(crq, vhost, &evt_doneq); 3823 crq->valid = 0; 3824 wmb(); 3825 } else 3826 done = 1; 3827 } 3828 3829 spin_unlock(vhost->crq.q_lock); 3830 spin_unlock_irqrestore(vhost->host->host_lock, flags); 3831 3832 list_for_each_entry_safe(evt, temp, &evt_doneq, queue_list) { 3833 del_timer(&evt->timer); 3834 list_del(&evt->queue_list); 3835 ibmvfc_trc_end(evt); 3836 evt->done(evt); 3837 } 3838 } 3839 3840 static int ibmvfc_toggle_scrq_irq(struct ibmvfc_queue *scrq, int enable) 3841 { 3842 struct device *dev = scrq->vhost->dev; 3843 struct vio_dev *vdev = to_vio_dev(dev); 3844 unsigned long rc; 3845 int irq_action = H_ENABLE_VIO_INTERRUPT; 3846 3847 if (!enable) 3848 irq_action = H_DISABLE_VIO_INTERRUPT; 3849 3850 rc = plpar_hcall_norets(H_VIOCTL, vdev->unit_address, irq_action, 3851 scrq->hw_irq, 0, 0); 3852 3853 if (rc) 3854 dev_err(dev, "Couldn't %s sub-crq[%lu] irq. rc=%ld\n", 3855 enable ? "enable" : "disable", scrq->hwq_id, rc); 3856 3857 return rc; 3858 } 3859 3860 static void ibmvfc_handle_scrq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost, 3861 struct list_head *evt_doneq) 3862 { 3863 struct ibmvfc_event *evt = (struct ibmvfc_event *)be64_to_cpu(crq->ioba); 3864 3865 switch (crq->valid) { 3866 case IBMVFC_CRQ_CMD_RSP: 3867 break; 3868 case IBMVFC_CRQ_XPORT_EVENT: 3869 return; 3870 default: 3871 dev_err(vhost->dev, "Got and invalid message type 0x%02x\n", crq->valid); 3872 return; 3873 } 3874 3875 /* The only kind of payload CRQs we should get are responses to 3876 * things we send. Make sure this response is to something we 3877 * actually sent 3878 */ 3879 if (unlikely(!ibmvfc_valid_event(&evt->queue->evt_pool, evt))) { 3880 dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n", 3881 crq->ioba); 3882 return; 3883 } 3884 3885 if (unlikely(atomic_dec_if_positive(&evt->active))) { 3886 dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n", 3887 crq->ioba); 3888 return; 3889 } 3890 3891 spin_lock(&evt->queue->l_lock); 3892 list_move_tail(&evt->queue_list, evt_doneq); 3893 spin_unlock(&evt->queue->l_lock); 3894 } 3895 3896 static struct ibmvfc_crq *ibmvfc_next_scrq(struct ibmvfc_queue *scrq) 3897 { 3898 struct ibmvfc_crq *crq; 3899 3900 crq = &scrq->msgs.scrq[scrq->cur].crq; 3901 if (crq->valid & 0x80) { 3902 if (++scrq->cur == scrq->size) 3903 scrq->cur = 0; 3904 rmb(); 3905 } else 3906 crq = NULL; 3907 3908 return crq; 3909 } 3910 3911 static void ibmvfc_drain_sub_crq(struct ibmvfc_queue *scrq) 3912 { 3913 struct ibmvfc_crq *crq; 3914 struct ibmvfc_event *evt, *temp; 3915 unsigned long flags; 3916 int done = 0; 3917 LIST_HEAD(evt_doneq); 3918 3919 spin_lock_irqsave(scrq->q_lock, flags); 3920 while (!done) { 3921 while ((crq = ibmvfc_next_scrq(scrq)) != NULL) { 3922 ibmvfc_handle_scrq(crq, scrq->vhost, &evt_doneq); 3923 crq->valid = 0; 3924 wmb(); 3925 } 3926 3927 ibmvfc_toggle_scrq_irq(scrq, 1); 3928 if ((crq = ibmvfc_next_scrq(scrq)) != NULL) { 3929 ibmvfc_toggle_scrq_irq(scrq, 0); 3930 ibmvfc_handle_scrq(crq, scrq->vhost, &evt_doneq); 3931 crq->valid = 0; 3932 wmb(); 3933 } else 3934 done = 1; 3935 } 3936 spin_unlock_irqrestore(scrq->q_lock, flags); 3937 3938 list_for_each_entry_safe(evt, temp, &evt_doneq, queue_list) { 3939 del_timer(&evt->timer); 3940 list_del(&evt->queue_list); 3941 ibmvfc_trc_end(evt); 3942 evt->done(evt); 3943 } 3944 } 3945 3946 static irqreturn_t ibmvfc_interrupt_mq(int irq, void *scrq_instance) 3947 { 3948 struct ibmvfc_queue *scrq = (struct ibmvfc_queue *)scrq_instance; 3949 3950 ibmvfc_toggle_scrq_irq(scrq, 0); 3951 ibmvfc_drain_sub_crq(scrq); 3952 3953 return IRQ_HANDLED; 3954 } 3955 3956 /** 3957 * ibmvfc_init_tgt - Set the next init job step for the target 3958 * @tgt: ibmvfc target struct 3959 * @job_step: job step to perform 3960 * 3961 **/ 3962 static void ibmvfc_init_tgt(struct ibmvfc_target *tgt, 3963 void (*job_step) (struct ibmvfc_target *)) 3964 { 3965 if (!ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT)) 3966 tgt->job_step = job_step; 3967 wake_up(&tgt->vhost->work_wait_q); 3968 } 3969 3970 /** 3971 * ibmvfc_retry_tgt_init - Attempt to retry a step in target initialization 3972 * @tgt: ibmvfc target struct 3973 * @job_step: initialization job step 3974 * 3975 * Returns: 1 if step will be retried / 0 if not 3976 * 3977 **/ 3978 static int ibmvfc_retry_tgt_init(struct ibmvfc_target *tgt, 3979 void (*job_step) (struct ibmvfc_target *)) 3980 { 3981 if (++tgt->init_retries > IBMVFC_MAX_TGT_INIT_RETRIES) { 3982 ibmvfc_del_tgt(tgt); 3983 wake_up(&tgt->vhost->work_wait_q); 3984 return 0; 3985 } else 3986 ibmvfc_init_tgt(tgt, job_step); 3987 return 1; 3988 } 3989 3990 /* Defined in FC-LS */ 3991 static const struct { 3992 int code; 3993 int retry; 3994 int logged_in; 3995 } prli_rsp [] = { 3996 { 0, 1, 0 }, 3997 { 1, 0, 1 }, 3998 { 2, 1, 0 }, 3999 { 3, 1, 0 }, 4000 { 4, 0, 0 }, 4001 { 5, 0, 0 }, 4002 { 6, 0, 1 }, 4003 { 7, 0, 0 }, 4004 { 8, 1, 0 }, 4005 }; 4006 4007 /** 4008 * ibmvfc_get_prli_rsp - Find PRLI response index 4009 * @flags: PRLI response flags 4010 * 4011 **/ 4012 static int ibmvfc_get_prli_rsp(u16 flags) 4013 { 4014 int i; 4015 int code = (flags & 0x0f00) >> 8; 4016 4017 for (i = 0; i < ARRAY_SIZE(prli_rsp); i++) 4018 if (prli_rsp[i].code == code) 4019 return i; 4020 4021 return 0; 4022 } 4023 4024 /** 4025 * ibmvfc_tgt_prli_done - Completion handler for Process Login 4026 * @evt: ibmvfc event struct 4027 * 4028 **/ 4029 static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt) 4030 { 4031 struct ibmvfc_target *tgt = evt->tgt; 4032 struct ibmvfc_host *vhost = evt->vhost; 4033 struct ibmvfc_process_login *rsp = &evt->xfer_iu->prli; 4034 struct ibmvfc_prli_svc_parms *parms = &rsp->parms; 4035 u32 status = be16_to_cpu(rsp->common.status); 4036 int index, level = IBMVFC_DEFAULT_LOG_LEVEL; 4037 4038 vhost->discovery_threads--; 4039 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4040 switch (status) { 4041 case IBMVFC_MAD_SUCCESS: 4042 tgt_dbg(tgt, "Process Login succeeded: %X %02X %04X\n", 4043 parms->type, parms->flags, parms->service_parms); 4044 4045 if (parms->type == IBMVFC_SCSI_FCP_TYPE) { 4046 index = ibmvfc_get_prli_rsp(be16_to_cpu(parms->flags)); 4047 if (prli_rsp[index].logged_in) { 4048 if (be16_to_cpu(parms->flags) & IBMVFC_PRLI_EST_IMG_PAIR) { 4049 tgt->need_login = 0; 4050 tgt->ids.roles = 0; 4051 if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_TARGET_FUNC) 4052 tgt->ids.roles |= FC_PORT_ROLE_FCP_TARGET; 4053 if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_INITIATOR_FUNC) 4054 tgt->ids.roles |= FC_PORT_ROLE_FCP_INITIATOR; 4055 tgt->add_rport = 1; 4056 } else 4057 ibmvfc_del_tgt(tgt); 4058 } else if (prli_rsp[index].retry) 4059 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli); 4060 else 4061 ibmvfc_del_tgt(tgt); 4062 } else 4063 ibmvfc_del_tgt(tgt); 4064 break; 4065 case IBMVFC_MAD_DRIVER_FAILED: 4066 break; 4067 case IBMVFC_MAD_CRQ_ERROR: 4068 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli); 4069 break; 4070 case IBMVFC_MAD_FAILED: 4071 default: 4072 if ((be16_to_cpu(rsp->status) & IBMVFC_VIOS_FAILURE) && 4073 be16_to_cpu(rsp->error) == IBMVFC_PLOGI_REQUIRED) 4074 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi); 4075 else if (tgt->logo_rcvd) 4076 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi); 4077 else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error))) 4078 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli); 4079 else 4080 ibmvfc_del_tgt(tgt); 4081 4082 tgt_log(tgt, level, "Process Login failed: %s (%x:%x) rc=0x%02X\n", 4083 ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)), 4084 be16_to_cpu(rsp->status), be16_to_cpu(rsp->error), status); 4085 break; 4086 } 4087 4088 kref_put(&tgt->kref, ibmvfc_release_tgt); 4089 ibmvfc_free_event(evt); 4090 wake_up(&vhost->work_wait_q); 4091 } 4092 4093 /** 4094 * ibmvfc_tgt_send_prli - Send a process login 4095 * @tgt: ibmvfc target struct 4096 * 4097 **/ 4098 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *tgt) 4099 { 4100 struct ibmvfc_process_login *prli; 4101 struct ibmvfc_host *vhost = tgt->vhost; 4102 struct ibmvfc_event *evt; 4103 4104 if (vhost->discovery_threads >= disc_threads) 4105 return; 4106 4107 kref_get(&tgt->kref); 4108 evt = ibmvfc_get_reserved_event(&vhost->crq); 4109 if (!evt) { 4110 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4111 kref_put(&tgt->kref, ibmvfc_release_tgt); 4112 __ibmvfc_reset_host(vhost); 4113 return; 4114 } 4115 vhost->discovery_threads++; 4116 ibmvfc_init_event(evt, ibmvfc_tgt_prli_done, IBMVFC_MAD_FORMAT); 4117 evt->tgt = tgt; 4118 prli = &evt->iu.prli; 4119 memset(prli, 0, sizeof(*prli)); 4120 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) { 4121 prli->common.version = cpu_to_be32(2); 4122 prli->target_wwpn = cpu_to_be64(tgt->wwpn); 4123 } else { 4124 prli->common.version = cpu_to_be32(1); 4125 } 4126 prli->common.opcode = cpu_to_be32(IBMVFC_PROCESS_LOGIN); 4127 prli->common.length = cpu_to_be16(sizeof(*prli)); 4128 prli->scsi_id = cpu_to_be64(tgt->scsi_id); 4129 4130 prli->parms.type = IBMVFC_SCSI_FCP_TYPE; 4131 prli->parms.flags = cpu_to_be16(IBMVFC_PRLI_EST_IMG_PAIR); 4132 prli->parms.service_parms = cpu_to_be32(IBMVFC_PRLI_INITIATOR_FUNC); 4133 prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_READ_FCP_XFER_RDY_DISABLED); 4134 4135 if (cls3_error) 4136 prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_RETRY); 4137 4138 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT); 4139 if (ibmvfc_send_event(evt, vhost, default_timeout)) { 4140 vhost->discovery_threads--; 4141 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4142 kref_put(&tgt->kref, ibmvfc_release_tgt); 4143 } else 4144 tgt_dbg(tgt, "Sent process login\n"); 4145 } 4146 4147 /** 4148 * ibmvfc_tgt_plogi_done - Completion handler for Port Login 4149 * @evt: ibmvfc event struct 4150 * 4151 **/ 4152 static void ibmvfc_tgt_plogi_done(struct ibmvfc_event *evt) 4153 { 4154 struct ibmvfc_target *tgt = evt->tgt; 4155 struct ibmvfc_host *vhost = evt->vhost; 4156 struct ibmvfc_port_login *rsp = &evt->xfer_iu->plogi; 4157 u32 status = be16_to_cpu(rsp->common.status); 4158 int level = IBMVFC_DEFAULT_LOG_LEVEL; 4159 4160 vhost->discovery_threads--; 4161 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4162 switch (status) { 4163 case IBMVFC_MAD_SUCCESS: 4164 tgt_dbg(tgt, "Port Login succeeded\n"); 4165 if (tgt->ids.port_name && 4166 tgt->ids.port_name != wwn_to_u64(rsp->service_parms.port_name)) { 4167 vhost->reinit = 1; 4168 tgt_dbg(tgt, "Port re-init required\n"); 4169 break; 4170 } 4171 tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name); 4172 tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name); 4173 tgt->ids.port_id = tgt->scsi_id; 4174 memcpy(&tgt->service_parms, &rsp->service_parms, 4175 sizeof(tgt->service_parms)); 4176 memcpy(&tgt->service_parms_change, &rsp->service_parms_change, 4177 sizeof(tgt->service_parms_change)); 4178 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli); 4179 break; 4180 case IBMVFC_MAD_DRIVER_FAILED: 4181 break; 4182 case IBMVFC_MAD_CRQ_ERROR: 4183 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi); 4184 break; 4185 case IBMVFC_MAD_FAILED: 4186 default: 4187 if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error))) 4188 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi); 4189 else 4190 ibmvfc_del_tgt(tgt); 4191 4192 tgt_log(tgt, level, "Port Login failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n", 4193 ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)), 4194 be16_to_cpu(rsp->status), be16_to_cpu(rsp->error), 4195 ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)), be16_to_cpu(rsp->fc_type), 4196 ibmvfc_get_ls_explain(be16_to_cpu(rsp->fc_explain)), be16_to_cpu(rsp->fc_explain), status); 4197 break; 4198 } 4199 4200 kref_put(&tgt->kref, ibmvfc_release_tgt); 4201 ibmvfc_free_event(evt); 4202 wake_up(&vhost->work_wait_q); 4203 } 4204 4205 /** 4206 * ibmvfc_tgt_send_plogi - Send PLOGI to the specified target 4207 * @tgt: ibmvfc target struct 4208 * 4209 **/ 4210 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *tgt) 4211 { 4212 struct ibmvfc_port_login *plogi; 4213 struct ibmvfc_host *vhost = tgt->vhost; 4214 struct ibmvfc_event *evt; 4215 4216 if (vhost->discovery_threads >= disc_threads) 4217 return; 4218 4219 kref_get(&tgt->kref); 4220 tgt->logo_rcvd = 0; 4221 evt = ibmvfc_get_reserved_event(&vhost->crq); 4222 if (!evt) { 4223 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4224 kref_put(&tgt->kref, ibmvfc_release_tgt); 4225 __ibmvfc_reset_host(vhost); 4226 return; 4227 } 4228 vhost->discovery_threads++; 4229 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT); 4230 ibmvfc_init_event(evt, ibmvfc_tgt_plogi_done, IBMVFC_MAD_FORMAT); 4231 evt->tgt = tgt; 4232 plogi = &evt->iu.plogi; 4233 memset(plogi, 0, sizeof(*plogi)); 4234 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) { 4235 plogi->common.version = cpu_to_be32(2); 4236 plogi->target_wwpn = cpu_to_be64(tgt->wwpn); 4237 } else { 4238 plogi->common.version = cpu_to_be32(1); 4239 } 4240 plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN); 4241 plogi->common.length = cpu_to_be16(sizeof(*plogi)); 4242 plogi->scsi_id = cpu_to_be64(tgt->scsi_id); 4243 4244 if (ibmvfc_send_event(evt, vhost, default_timeout)) { 4245 vhost->discovery_threads--; 4246 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4247 kref_put(&tgt->kref, ibmvfc_release_tgt); 4248 } else 4249 tgt_dbg(tgt, "Sent port login\n"); 4250 } 4251 4252 /** 4253 * ibmvfc_tgt_implicit_logout_done - Completion handler for Implicit Logout MAD 4254 * @evt: ibmvfc event struct 4255 * 4256 **/ 4257 static void ibmvfc_tgt_implicit_logout_done(struct ibmvfc_event *evt) 4258 { 4259 struct ibmvfc_target *tgt = evt->tgt; 4260 struct ibmvfc_host *vhost = evt->vhost; 4261 struct ibmvfc_implicit_logout *rsp = &evt->xfer_iu->implicit_logout; 4262 u32 status = be16_to_cpu(rsp->common.status); 4263 4264 vhost->discovery_threads--; 4265 ibmvfc_free_event(evt); 4266 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4267 4268 switch (status) { 4269 case IBMVFC_MAD_SUCCESS: 4270 tgt_dbg(tgt, "Implicit Logout succeeded\n"); 4271 break; 4272 case IBMVFC_MAD_DRIVER_FAILED: 4273 kref_put(&tgt->kref, ibmvfc_release_tgt); 4274 wake_up(&vhost->work_wait_q); 4275 return; 4276 case IBMVFC_MAD_FAILED: 4277 default: 4278 tgt_err(tgt, "Implicit Logout failed: rc=0x%02X\n", status); 4279 break; 4280 } 4281 4282 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_plogi); 4283 kref_put(&tgt->kref, ibmvfc_release_tgt); 4284 wake_up(&vhost->work_wait_q); 4285 } 4286 4287 /** 4288 * __ibmvfc_tgt_get_implicit_logout_evt - Allocate and init an event for implicit logout 4289 * @tgt: ibmvfc target struct 4290 * @done: Routine to call when the event is responded to 4291 * 4292 * Returns: 4293 * Allocated and initialized ibmvfc_event struct 4294 **/ 4295 static struct ibmvfc_event *__ibmvfc_tgt_get_implicit_logout_evt(struct ibmvfc_target *tgt, 4296 void (*done) (struct ibmvfc_event *)) 4297 { 4298 struct ibmvfc_implicit_logout *mad; 4299 struct ibmvfc_host *vhost = tgt->vhost; 4300 struct ibmvfc_event *evt; 4301 4302 kref_get(&tgt->kref); 4303 evt = ibmvfc_get_reserved_event(&vhost->crq); 4304 if (!evt) 4305 return NULL; 4306 ibmvfc_init_event(evt, done, IBMVFC_MAD_FORMAT); 4307 evt->tgt = tgt; 4308 mad = &evt->iu.implicit_logout; 4309 memset(mad, 0, sizeof(*mad)); 4310 mad->common.version = cpu_to_be32(1); 4311 mad->common.opcode = cpu_to_be32(IBMVFC_IMPLICIT_LOGOUT); 4312 mad->common.length = cpu_to_be16(sizeof(*mad)); 4313 mad->old_scsi_id = cpu_to_be64(tgt->scsi_id); 4314 return evt; 4315 } 4316 4317 /** 4318 * ibmvfc_tgt_implicit_logout - Initiate an Implicit Logout for specified target 4319 * @tgt: ibmvfc target struct 4320 * 4321 **/ 4322 static void ibmvfc_tgt_implicit_logout(struct ibmvfc_target *tgt) 4323 { 4324 struct ibmvfc_host *vhost = tgt->vhost; 4325 struct ibmvfc_event *evt; 4326 4327 if (vhost->discovery_threads >= disc_threads) 4328 return; 4329 4330 vhost->discovery_threads++; 4331 evt = __ibmvfc_tgt_get_implicit_logout_evt(tgt, 4332 ibmvfc_tgt_implicit_logout_done); 4333 if (!evt) { 4334 vhost->discovery_threads--; 4335 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4336 kref_put(&tgt->kref, ibmvfc_release_tgt); 4337 __ibmvfc_reset_host(vhost); 4338 return; 4339 } 4340 4341 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT); 4342 if (ibmvfc_send_event(evt, vhost, default_timeout)) { 4343 vhost->discovery_threads--; 4344 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4345 kref_put(&tgt->kref, ibmvfc_release_tgt); 4346 } else 4347 tgt_dbg(tgt, "Sent Implicit Logout\n"); 4348 } 4349 4350 /** 4351 * ibmvfc_tgt_implicit_logout_and_del_done - Completion handler for Implicit Logout MAD 4352 * @evt: ibmvfc event struct 4353 * 4354 **/ 4355 static void ibmvfc_tgt_implicit_logout_and_del_done(struct ibmvfc_event *evt) 4356 { 4357 struct ibmvfc_target *tgt = evt->tgt; 4358 struct ibmvfc_host *vhost = evt->vhost; 4359 struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru; 4360 u32 status = be16_to_cpu(mad->common.status); 4361 4362 vhost->discovery_threads--; 4363 ibmvfc_free_event(evt); 4364 4365 /* 4366 * If our state is IBMVFC_HOST_OFFLINE, we could be unloading the 4367 * driver in which case we need to free up all the targets. If we are 4368 * not unloading, we will still go through a hard reset to get out of 4369 * offline state, so there is no need to track the old targets in that 4370 * case. 4371 */ 4372 if (status == IBMVFC_MAD_SUCCESS || vhost->state == IBMVFC_HOST_OFFLINE) 4373 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); 4374 else 4375 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT); 4376 4377 tgt_dbg(tgt, "Implicit Logout %s\n", (status == IBMVFC_MAD_SUCCESS) ? "succeeded" : "failed"); 4378 kref_put(&tgt->kref, ibmvfc_release_tgt); 4379 wake_up(&vhost->work_wait_q); 4380 } 4381 4382 /** 4383 * ibmvfc_tgt_implicit_logout_and_del - Initiate an Implicit Logout for specified target 4384 * @tgt: ibmvfc target struct 4385 * 4386 **/ 4387 static void ibmvfc_tgt_implicit_logout_and_del(struct ibmvfc_target *tgt) 4388 { 4389 struct ibmvfc_host *vhost = tgt->vhost; 4390 struct ibmvfc_event *evt; 4391 4392 if (!vhost->logged_in) { 4393 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); 4394 return; 4395 } 4396 4397 if (vhost->discovery_threads >= disc_threads) 4398 return; 4399 4400 vhost->discovery_threads++; 4401 evt = __ibmvfc_tgt_get_implicit_logout_evt(tgt, 4402 ibmvfc_tgt_implicit_logout_and_del_done); 4403 4404 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT); 4405 if (ibmvfc_send_event(evt, vhost, default_timeout)) { 4406 vhost->discovery_threads--; 4407 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); 4408 kref_put(&tgt->kref, ibmvfc_release_tgt); 4409 } else 4410 tgt_dbg(tgt, "Sent Implicit Logout\n"); 4411 } 4412 4413 /** 4414 * ibmvfc_tgt_move_login_done - Completion handler for Move Login 4415 * @evt: ibmvfc event struct 4416 * 4417 **/ 4418 static void ibmvfc_tgt_move_login_done(struct ibmvfc_event *evt) 4419 { 4420 struct ibmvfc_target *tgt = evt->tgt; 4421 struct ibmvfc_host *vhost = evt->vhost; 4422 struct ibmvfc_move_login *rsp = &evt->xfer_iu->move_login; 4423 u32 status = be16_to_cpu(rsp->common.status); 4424 int level = IBMVFC_DEFAULT_LOG_LEVEL; 4425 4426 vhost->discovery_threads--; 4427 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4428 switch (status) { 4429 case IBMVFC_MAD_SUCCESS: 4430 tgt_dbg(tgt, "Move Login succeeded for new scsi_id: %llX\n", tgt->new_scsi_id); 4431 tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name); 4432 tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name); 4433 tgt->scsi_id = tgt->new_scsi_id; 4434 tgt->ids.port_id = tgt->scsi_id; 4435 memcpy(&tgt->service_parms, &rsp->service_parms, 4436 sizeof(tgt->service_parms)); 4437 memcpy(&tgt->service_parms_change, &rsp->service_parms_change, 4438 sizeof(tgt->service_parms_change)); 4439 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli); 4440 break; 4441 case IBMVFC_MAD_DRIVER_FAILED: 4442 break; 4443 case IBMVFC_MAD_CRQ_ERROR: 4444 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_move_login); 4445 break; 4446 case IBMVFC_MAD_FAILED: 4447 default: 4448 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_move_login); 4449 4450 tgt_log(tgt, level, 4451 "Move Login failed: new scsi_id: %llX, flags:%x, vios_flags:%x, rc=0x%02X\n", 4452 tgt->new_scsi_id, be32_to_cpu(rsp->flags), be16_to_cpu(rsp->vios_flags), 4453 status); 4454 break; 4455 } 4456 4457 kref_put(&tgt->kref, ibmvfc_release_tgt); 4458 ibmvfc_free_event(evt); 4459 wake_up(&vhost->work_wait_q); 4460 } 4461 4462 4463 /** 4464 * ibmvfc_tgt_move_login - Initiate a move login for specified target 4465 * @tgt: ibmvfc target struct 4466 * 4467 **/ 4468 static void ibmvfc_tgt_move_login(struct ibmvfc_target *tgt) 4469 { 4470 struct ibmvfc_host *vhost = tgt->vhost; 4471 struct ibmvfc_move_login *move; 4472 struct ibmvfc_event *evt; 4473 4474 if (vhost->discovery_threads >= disc_threads) 4475 return; 4476 4477 kref_get(&tgt->kref); 4478 evt = ibmvfc_get_reserved_event(&vhost->crq); 4479 if (!evt) { 4480 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); 4481 kref_put(&tgt->kref, ibmvfc_release_tgt); 4482 __ibmvfc_reset_host(vhost); 4483 return; 4484 } 4485 vhost->discovery_threads++; 4486 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT); 4487 ibmvfc_init_event(evt, ibmvfc_tgt_move_login_done, IBMVFC_MAD_FORMAT); 4488 evt->tgt = tgt; 4489 move = &evt->iu.move_login; 4490 memset(move, 0, sizeof(*move)); 4491 move->common.version = cpu_to_be32(1); 4492 move->common.opcode = cpu_to_be32(IBMVFC_MOVE_LOGIN); 4493 move->common.length = cpu_to_be16(sizeof(*move)); 4494 4495 move->old_scsi_id = cpu_to_be64(tgt->scsi_id); 4496 move->new_scsi_id = cpu_to_be64(tgt->new_scsi_id); 4497 move->wwpn = cpu_to_be64(tgt->wwpn); 4498 move->node_name = cpu_to_be64(tgt->ids.node_name); 4499 4500 if (ibmvfc_send_event(evt, vhost, default_timeout)) { 4501 vhost->discovery_threads--; 4502 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); 4503 kref_put(&tgt->kref, ibmvfc_release_tgt); 4504 } else 4505 tgt_dbg(tgt, "Sent Move Login for new scsi_id: %llX\n", tgt->new_scsi_id); 4506 } 4507 4508 /** 4509 * ibmvfc_adisc_needs_plogi - Does device need PLOGI? 4510 * @mad: ibmvfc passthru mad struct 4511 * @tgt: ibmvfc target struct 4512 * 4513 * Returns: 4514 * 1 if PLOGI needed / 0 if PLOGI not needed 4515 **/ 4516 static int ibmvfc_adisc_needs_plogi(struct ibmvfc_passthru_mad *mad, 4517 struct ibmvfc_target *tgt) 4518 { 4519 if (wwn_to_u64((u8 *)&mad->fc_iu.response[2]) != tgt->ids.port_name) 4520 return 1; 4521 if (wwn_to_u64((u8 *)&mad->fc_iu.response[4]) != tgt->ids.node_name) 4522 return 1; 4523 if (be32_to_cpu(mad->fc_iu.response[6]) != tgt->scsi_id) 4524 return 1; 4525 return 0; 4526 } 4527 4528 /** 4529 * ibmvfc_tgt_adisc_done - Completion handler for ADISC 4530 * @evt: ibmvfc event struct 4531 * 4532 **/ 4533 static void ibmvfc_tgt_adisc_done(struct ibmvfc_event *evt) 4534 { 4535 struct ibmvfc_target *tgt = evt->tgt; 4536 struct ibmvfc_host *vhost = evt->vhost; 4537 struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru; 4538 u32 status = be16_to_cpu(mad->common.status); 4539 u8 fc_reason, fc_explain; 4540 4541 vhost->discovery_threads--; 4542 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4543 del_timer(&tgt->timer); 4544 4545 switch (status) { 4546 case IBMVFC_MAD_SUCCESS: 4547 tgt_dbg(tgt, "ADISC succeeded\n"); 4548 if (ibmvfc_adisc_needs_plogi(mad, tgt)) 4549 ibmvfc_del_tgt(tgt); 4550 break; 4551 case IBMVFC_MAD_DRIVER_FAILED: 4552 break; 4553 case IBMVFC_MAD_FAILED: 4554 default: 4555 ibmvfc_del_tgt(tgt); 4556 fc_reason = (be32_to_cpu(mad->fc_iu.response[1]) & 0x00ff0000) >> 16; 4557 fc_explain = (be32_to_cpu(mad->fc_iu.response[1]) & 0x0000ff00) >> 8; 4558 tgt_info(tgt, "ADISC failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n", 4559 ibmvfc_get_cmd_error(be16_to_cpu(mad->iu.status), be16_to_cpu(mad->iu.error)), 4560 be16_to_cpu(mad->iu.status), be16_to_cpu(mad->iu.error), 4561 ibmvfc_get_fc_type(fc_reason), fc_reason, 4562 ibmvfc_get_ls_explain(fc_explain), fc_explain, status); 4563 break; 4564 } 4565 4566 kref_put(&tgt->kref, ibmvfc_release_tgt); 4567 ibmvfc_free_event(evt); 4568 wake_up(&vhost->work_wait_q); 4569 } 4570 4571 /** 4572 * ibmvfc_init_passthru - Initialize an event struct for FC passthru 4573 * @evt: ibmvfc event struct 4574 * 4575 **/ 4576 static void ibmvfc_init_passthru(struct ibmvfc_event *evt) 4577 { 4578 struct ibmvfc_passthru_mad *mad = &evt->iu.passthru; 4579 4580 memset(mad, 0, sizeof(*mad)); 4581 mad->common.version = cpu_to_be32(1); 4582 mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU); 4583 mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu)); 4584 mad->cmd_ioba.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) + 4585 offsetof(struct ibmvfc_passthru_mad, iu)); 4586 mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu)); 4587 mad->iu.cmd_len = cpu_to_be32(sizeof(mad->fc_iu.payload)); 4588 mad->iu.rsp_len = cpu_to_be32(sizeof(mad->fc_iu.response)); 4589 mad->iu.cmd.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) + 4590 offsetof(struct ibmvfc_passthru_mad, fc_iu) + 4591 offsetof(struct ibmvfc_passthru_fc_iu, payload)); 4592 mad->iu.cmd.len = cpu_to_be32(sizeof(mad->fc_iu.payload)); 4593 mad->iu.rsp.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) + 4594 offsetof(struct ibmvfc_passthru_mad, fc_iu) + 4595 offsetof(struct ibmvfc_passthru_fc_iu, response)); 4596 mad->iu.rsp.len = cpu_to_be32(sizeof(mad->fc_iu.response)); 4597 } 4598 4599 /** 4600 * ibmvfc_tgt_adisc_cancel_done - Completion handler when cancelling an ADISC 4601 * @evt: ibmvfc event struct 4602 * 4603 * Just cleanup this event struct. Everything else is handled by 4604 * the ADISC completion handler. If the ADISC never actually comes 4605 * back, we still have the timer running on the ADISC event struct 4606 * which will fire and cause the CRQ to get reset. 4607 * 4608 **/ 4609 static void ibmvfc_tgt_adisc_cancel_done(struct ibmvfc_event *evt) 4610 { 4611 struct ibmvfc_host *vhost = evt->vhost; 4612 struct ibmvfc_target *tgt = evt->tgt; 4613 4614 tgt_dbg(tgt, "ADISC cancel complete\n"); 4615 vhost->abort_threads--; 4616 ibmvfc_free_event(evt); 4617 kref_put(&tgt->kref, ibmvfc_release_tgt); 4618 wake_up(&vhost->work_wait_q); 4619 } 4620 4621 /** 4622 * ibmvfc_adisc_timeout - Handle an ADISC timeout 4623 * @t: ibmvfc target struct 4624 * 4625 * If an ADISC times out, send a cancel. If the cancel times 4626 * out, reset the CRQ. When the ADISC comes back as cancelled, 4627 * log back into the target. 4628 **/ 4629 static void ibmvfc_adisc_timeout(struct timer_list *t) 4630 { 4631 struct ibmvfc_target *tgt = from_timer(tgt, t, timer); 4632 struct ibmvfc_host *vhost = tgt->vhost; 4633 struct ibmvfc_event *evt; 4634 struct ibmvfc_tmf *tmf; 4635 unsigned long flags; 4636 int rc; 4637 4638 tgt_dbg(tgt, "ADISC timeout\n"); 4639 spin_lock_irqsave(vhost->host->host_lock, flags); 4640 if (vhost->abort_threads >= disc_threads || 4641 tgt->action != IBMVFC_TGT_ACTION_INIT_WAIT || 4642 vhost->state != IBMVFC_INITIALIZING || 4643 vhost->action != IBMVFC_HOST_ACTION_QUERY_TGTS) { 4644 spin_unlock_irqrestore(vhost->host->host_lock, flags); 4645 return; 4646 } 4647 4648 vhost->abort_threads++; 4649 kref_get(&tgt->kref); 4650 evt = ibmvfc_get_reserved_event(&vhost->crq); 4651 if (!evt) { 4652 tgt_err(tgt, "Failed to get cancel event for ADISC.\n"); 4653 vhost->abort_threads--; 4654 kref_put(&tgt->kref, ibmvfc_release_tgt); 4655 __ibmvfc_reset_host(vhost); 4656 spin_unlock_irqrestore(vhost->host->host_lock, flags); 4657 return; 4658 } 4659 ibmvfc_init_event(evt, ibmvfc_tgt_adisc_cancel_done, IBMVFC_MAD_FORMAT); 4660 4661 evt->tgt = tgt; 4662 tmf = &evt->iu.tmf; 4663 memset(tmf, 0, sizeof(*tmf)); 4664 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) { 4665 tmf->common.version = cpu_to_be32(2); 4666 tmf->target_wwpn = cpu_to_be64(tgt->wwpn); 4667 } else { 4668 tmf->common.version = cpu_to_be32(1); 4669 } 4670 tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD); 4671 tmf->common.length = cpu_to_be16(sizeof(*tmf)); 4672 tmf->scsi_id = cpu_to_be64(tgt->scsi_id); 4673 tmf->cancel_key = cpu_to_be32(tgt->cancel_key); 4674 4675 rc = ibmvfc_send_event(evt, vhost, default_timeout); 4676 4677 if (rc) { 4678 tgt_err(tgt, "Failed to send cancel event for ADISC. rc=%d\n", rc); 4679 vhost->abort_threads--; 4680 kref_put(&tgt->kref, ibmvfc_release_tgt); 4681 __ibmvfc_reset_host(vhost); 4682 } else 4683 tgt_dbg(tgt, "Attempting to cancel ADISC\n"); 4684 spin_unlock_irqrestore(vhost->host->host_lock, flags); 4685 } 4686 4687 /** 4688 * ibmvfc_tgt_adisc - Initiate an ADISC for specified target 4689 * @tgt: ibmvfc target struct 4690 * 4691 * When sending an ADISC we end up with two timers running. The 4692 * first timer is the timer in the ibmvfc target struct. If this 4693 * fires, we send a cancel to the target. The second timer is the 4694 * timer on the ibmvfc event for the ADISC, which is longer. If that 4695 * fires, it means the ADISC timed out and our attempt to cancel it 4696 * also failed, so we need to reset the CRQ. 4697 **/ 4698 static void ibmvfc_tgt_adisc(struct ibmvfc_target *tgt) 4699 { 4700 struct ibmvfc_passthru_mad *mad; 4701 struct ibmvfc_host *vhost = tgt->vhost; 4702 struct ibmvfc_event *evt; 4703 4704 if (vhost->discovery_threads >= disc_threads) 4705 return; 4706 4707 kref_get(&tgt->kref); 4708 evt = ibmvfc_get_reserved_event(&vhost->crq); 4709 if (!evt) { 4710 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4711 kref_put(&tgt->kref, ibmvfc_release_tgt); 4712 __ibmvfc_reset_host(vhost); 4713 return; 4714 } 4715 vhost->discovery_threads++; 4716 ibmvfc_init_event(evt, ibmvfc_tgt_adisc_done, IBMVFC_MAD_FORMAT); 4717 evt->tgt = tgt; 4718 4719 ibmvfc_init_passthru(evt); 4720 mad = &evt->iu.passthru; 4721 mad->iu.flags = cpu_to_be32(IBMVFC_FC_ELS); 4722 mad->iu.scsi_id = cpu_to_be64(tgt->scsi_id); 4723 mad->iu.cancel_key = cpu_to_be32(tgt->cancel_key); 4724 4725 mad->fc_iu.payload[0] = cpu_to_be32(IBMVFC_ADISC); 4726 memcpy(&mad->fc_iu.payload[2], &vhost->login_buf->resp.port_name, 4727 sizeof(vhost->login_buf->resp.port_name)); 4728 memcpy(&mad->fc_iu.payload[4], &vhost->login_buf->resp.node_name, 4729 sizeof(vhost->login_buf->resp.node_name)); 4730 mad->fc_iu.payload[6] = cpu_to_be32(be64_to_cpu(vhost->login_buf->resp.scsi_id) & 0x00ffffff); 4731 4732 if (timer_pending(&tgt->timer)) 4733 mod_timer(&tgt->timer, jiffies + (IBMVFC_ADISC_TIMEOUT * HZ)); 4734 else { 4735 tgt->timer.expires = jiffies + (IBMVFC_ADISC_TIMEOUT * HZ); 4736 add_timer(&tgt->timer); 4737 } 4738 4739 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT); 4740 if (ibmvfc_send_event(evt, vhost, IBMVFC_ADISC_PLUS_CANCEL_TIMEOUT)) { 4741 vhost->discovery_threads--; 4742 del_timer(&tgt->timer); 4743 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4744 kref_put(&tgt->kref, ibmvfc_release_tgt); 4745 } else 4746 tgt_dbg(tgt, "Sent ADISC\n"); 4747 } 4748 4749 /** 4750 * ibmvfc_tgt_query_target_done - Completion handler for Query Target MAD 4751 * @evt: ibmvfc event struct 4752 * 4753 **/ 4754 static void ibmvfc_tgt_query_target_done(struct ibmvfc_event *evt) 4755 { 4756 struct ibmvfc_target *tgt = evt->tgt; 4757 struct ibmvfc_host *vhost = evt->vhost; 4758 struct ibmvfc_query_tgt *rsp = &evt->xfer_iu->query_tgt; 4759 u32 status = be16_to_cpu(rsp->common.status); 4760 int level = IBMVFC_DEFAULT_LOG_LEVEL; 4761 4762 vhost->discovery_threads--; 4763 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4764 switch (status) { 4765 case IBMVFC_MAD_SUCCESS: 4766 tgt_dbg(tgt, "Query Target succeeded\n"); 4767 if (be64_to_cpu(rsp->scsi_id) != tgt->scsi_id) 4768 ibmvfc_del_tgt(tgt); 4769 else 4770 ibmvfc_init_tgt(tgt, ibmvfc_tgt_adisc); 4771 break; 4772 case IBMVFC_MAD_DRIVER_FAILED: 4773 break; 4774 case IBMVFC_MAD_CRQ_ERROR: 4775 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target); 4776 break; 4777 case IBMVFC_MAD_FAILED: 4778 default: 4779 if ((be16_to_cpu(rsp->status) & IBMVFC_FABRIC_MAPPED) == IBMVFC_FABRIC_MAPPED && 4780 be16_to_cpu(rsp->error) == IBMVFC_UNABLE_TO_PERFORM_REQ && 4781 be16_to_cpu(rsp->fc_explain) == IBMVFC_PORT_NAME_NOT_REG) 4782 ibmvfc_del_tgt(tgt); 4783 else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error))) 4784 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target); 4785 else 4786 ibmvfc_del_tgt(tgt); 4787 4788 tgt_log(tgt, level, "Query Target failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n", 4789 ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)), 4790 be16_to_cpu(rsp->status), be16_to_cpu(rsp->error), 4791 ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)), be16_to_cpu(rsp->fc_type), 4792 ibmvfc_get_gs_explain(be16_to_cpu(rsp->fc_explain)), be16_to_cpu(rsp->fc_explain), 4793 status); 4794 break; 4795 } 4796 4797 kref_put(&tgt->kref, ibmvfc_release_tgt); 4798 ibmvfc_free_event(evt); 4799 wake_up(&vhost->work_wait_q); 4800 } 4801 4802 /** 4803 * ibmvfc_tgt_query_target - Initiate a Query Target for specified target 4804 * @tgt: ibmvfc target struct 4805 * 4806 **/ 4807 static void ibmvfc_tgt_query_target(struct ibmvfc_target *tgt) 4808 { 4809 struct ibmvfc_query_tgt *query_tgt; 4810 struct ibmvfc_host *vhost = tgt->vhost; 4811 struct ibmvfc_event *evt; 4812 4813 if (vhost->discovery_threads >= disc_threads) 4814 return; 4815 4816 kref_get(&tgt->kref); 4817 evt = ibmvfc_get_reserved_event(&vhost->crq); 4818 if (!evt) { 4819 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4820 kref_put(&tgt->kref, ibmvfc_release_tgt); 4821 __ibmvfc_reset_host(vhost); 4822 return; 4823 } 4824 vhost->discovery_threads++; 4825 evt->tgt = tgt; 4826 ibmvfc_init_event(evt, ibmvfc_tgt_query_target_done, IBMVFC_MAD_FORMAT); 4827 query_tgt = &evt->iu.query_tgt; 4828 memset(query_tgt, 0, sizeof(*query_tgt)); 4829 query_tgt->common.version = cpu_to_be32(1); 4830 query_tgt->common.opcode = cpu_to_be32(IBMVFC_QUERY_TARGET); 4831 query_tgt->common.length = cpu_to_be16(sizeof(*query_tgt)); 4832 query_tgt->wwpn = cpu_to_be64(tgt->ids.port_name); 4833 4834 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT); 4835 if (ibmvfc_send_event(evt, vhost, default_timeout)) { 4836 vhost->discovery_threads--; 4837 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4838 kref_put(&tgt->kref, ibmvfc_release_tgt); 4839 } else 4840 tgt_dbg(tgt, "Sent Query Target\n"); 4841 } 4842 4843 /** 4844 * ibmvfc_alloc_target - Allocate and initialize an ibmvfc target 4845 * @vhost: ibmvfc host struct 4846 * @target: Holds SCSI ID to allocate target forand the WWPN 4847 * 4848 * Returns: 4849 * 0 on success / other on failure 4850 **/ 4851 static int ibmvfc_alloc_target(struct ibmvfc_host *vhost, 4852 struct ibmvfc_discover_targets_entry *target) 4853 { 4854 struct ibmvfc_target *stgt = NULL; 4855 struct ibmvfc_target *wtgt = NULL; 4856 struct ibmvfc_target *tgt; 4857 unsigned long flags; 4858 u64 scsi_id = be32_to_cpu(target->scsi_id) & IBMVFC_DISC_TGT_SCSI_ID_MASK; 4859 u64 wwpn = be64_to_cpu(target->wwpn); 4860 4861 /* Look to see if we already have a target allocated for this SCSI ID or WWPN */ 4862 spin_lock_irqsave(vhost->host->host_lock, flags); 4863 list_for_each_entry(tgt, &vhost->targets, queue) { 4864 if (tgt->wwpn == wwpn) { 4865 wtgt = tgt; 4866 break; 4867 } 4868 } 4869 4870 list_for_each_entry(tgt, &vhost->targets, queue) { 4871 if (tgt->scsi_id == scsi_id) { 4872 stgt = tgt; 4873 break; 4874 } 4875 } 4876 4877 if (wtgt && !stgt) { 4878 /* 4879 * A WWPN target has moved and we still are tracking the old 4880 * SCSI ID. The only way we should be able to get here is if 4881 * we attempted to send an implicit logout for the old SCSI ID 4882 * and it failed for some reason, such as there being I/O 4883 * pending to the target. In this case, we will have already 4884 * deleted the rport from the FC transport so we do a move 4885 * login, which works even with I/O pending, however, if 4886 * there is still I/O pending, it will stay outstanding, so 4887 * we only do this if fast fail is disabled for the rport, 4888 * otherwise we let terminate_rport_io clean up the port 4889 * before we login at the new location. 4890 */ 4891 if (wtgt->action == IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT) { 4892 if (wtgt->move_login) { 4893 /* 4894 * Do a move login here. The old target is no longer 4895 * known to the transport layer We don't use the 4896 * normal ibmvfc_set_tgt_action to set this, as we 4897 * don't normally want to allow this state change. 4898 */ 4899 wtgt->new_scsi_id = scsi_id; 4900 wtgt->action = IBMVFC_TGT_ACTION_INIT; 4901 wtgt->init_retries = 0; 4902 ibmvfc_init_tgt(wtgt, ibmvfc_tgt_move_login); 4903 } 4904 goto unlock_out; 4905 } else { 4906 tgt_err(wtgt, "Unexpected target state: %d, %p\n", 4907 wtgt->action, wtgt->rport); 4908 } 4909 } else if (stgt) { 4910 if (tgt->need_login) 4911 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout); 4912 goto unlock_out; 4913 } 4914 spin_unlock_irqrestore(vhost->host->host_lock, flags); 4915 4916 tgt = mempool_alloc(vhost->tgt_pool, GFP_NOIO); 4917 memset(tgt, 0, sizeof(*tgt)); 4918 tgt->scsi_id = scsi_id; 4919 tgt->wwpn = wwpn; 4920 tgt->vhost = vhost; 4921 tgt->need_login = 1; 4922 timer_setup(&tgt->timer, ibmvfc_adisc_timeout, 0); 4923 kref_init(&tgt->kref); 4924 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout); 4925 spin_lock_irqsave(vhost->host->host_lock, flags); 4926 tgt->cancel_key = vhost->task_set++; 4927 list_add_tail(&tgt->queue, &vhost->targets); 4928 4929 unlock_out: 4930 spin_unlock_irqrestore(vhost->host->host_lock, flags); 4931 return 0; 4932 } 4933 4934 /** 4935 * ibmvfc_alloc_targets - Allocate and initialize ibmvfc targets 4936 * @vhost: ibmvfc host struct 4937 * 4938 * Returns: 4939 * 0 on success / other on failure 4940 **/ 4941 static int ibmvfc_alloc_targets(struct ibmvfc_host *vhost) 4942 { 4943 int i, rc; 4944 4945 for (i = 0, rc = 0; !rc && i < vhost->num_targets; i++) 4946 rc = ibmvfc_alloc_target(vhost, &vhost->scsi_scrqs.disc_buf[i]); 4947 4948 return rc; 4949 } 4950 4951 /** 4952 * ibmvfc_discover_targets_done - Completion handler for discover targets MAD 4953 * @evt: ibmvfc event struct 4954 * 4955 **/ 4956 static void ibmvfc_discover_targets_done(struct ibmvfc_event *evt) 4957 { 4958 struct ibmvfc_host *vhost = evt->vhost; 4959 struct ibmvfc_discover_targets *rsp = &evt->xfer_iu->discover_targets; 4960 u32 mad_status = be16_to_cpu(rsp->common.status); 4961 int level = IBMVFC_DEFAULT_LOG_LEVEL; 4962 4963 switch (mad_status) { 4964 case IBMVFC_MAD_SUCCESS: 4965 ibmvfc_dbg(vhost, "Discover Targets succeeded\n"); 4966 vhost->num_targets = be32_to_cpu(rsp->num_written); 4967 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_ALLOC_TGTS); 4968 break; 4969 case IBMVFC_MAD_FAILED: 4970 level += ibmvfc_retry_host_init(vhost); 4971 ibmvfc_log(vhost, level, "Discover Targets failed: %s (%x:%x)\n", 4972 ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)), 4973 be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)); 4974 break; 4975 case IBMVFC_MAD_DRIVER_FAILED: 4976 break; 4977 default: 4978 dev_err(vhost->dev, "Invalid Discover Targets response: 0x%x\n", mad_status); 4979 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 4980 break; 4981 } 4982 4983 ibmvfc_free_event(evt); 4984 wake_up(&vhost->work_wait_q); 4985 } 4986 4987 /** 4988 * ibmvfc_discover_targets - Send Discover Targets MAD 4989 * @vhost: ibmvfc host struct 4990 * 4991 **/ 4992 static void ibmvfc_discover_targets(struct ibmvfc_host *vhost) 4993 { 4994 struct ibmvfc_discover_targets *mad; 4995 struct ibmvfc_event *evt = ibmvfc_get_reserved_event(&vhost->crq); 4996 int level = IBMVFC_DEFAULT_LOG_LEVEL; 4997 4998 if (!evt) { 4999 ibmvfc_log(vhost, level, "Discover Targets failed: no available events\n"); 5000 ibmvfc_hard_reset_host(vhost); 5001 return; 5002 } 5003 5004 ibmvfc_init_event(evt, ibmvfc_discover_targets_done, IBMVFC_MAD_FORMAT); 5005 mad = &evt->iu.discover_targets; 5006 memset(mad, 0, sizeof(*mad)); 5007 mad->common.version = cpu_to_be32(1); 5008 mad->common.opcode = cpu_to_be32(IBMVFC_DISC_TARGETS); 5009 mad->common.length = cpu_to_be16(sizeof(*mad)); 5010 mad->bufflen = cpu_to_be32(vhost->scsi_scrqs.disc_buf_sz); 5011 mad->buffer.va = cpu_to_be64(vhost->scsi_scrqs.disc_buf_dma); 5012 mad->buffer.len = cpu_to_be32(vhost->scsi_scrqs.disc_buf_sz); 5013 mad->flags = cpu_to_be32(IBMVFC_DISC_TGT_PORT_ID_WWPN_LIST); 5014 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT); 5015 5016 if (!ibmvfc_send_event(evt, vhost, default_timeout)) 5017 ibmvfc_dbg(vhost, "Sent discover targets\n"); 5018 else 5019 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 5020 } 5021 5022 static void ibmvfc_channel_setup_done(struct ibmvfc_event *evt) 5023 { 5024 struct ibmvfc_host *vhost = evt->vhost; 5025 struct ibmvfc_channel_setup *setup = vhost->channel_setup_buf; 5026 struct ibmvfc_channels *scrqs = &vhost->scsi_scrqs; 5027 u32 mad_status = be16_to_cpu(evt->xfer_iu->channel_setup.common.status); 5028 int level = IBMVFC_DEFAULT_LOG_LEVEL; 5029 int flags, active_queues, i; 5030 5031 ibmvfc_free_event(evt); 5032 5033 switch (mad_status) { 5034 case IBMVFC_MAD_SUCCESS: 5035 ibmvfc_dbg(vhost, "Channel Setup succeeded\n"); 5036 flags = be32_to_cpu(setup->flags); 5037 vhost->do_enquiry = 0; 5038 active_queues = be32_to_cpu(setup->num_scsi_subq_channels); 5039 scrqs->active_queues = active_queues; 5040 5041 if (flags & IBMVFC_CHANNELS_CANCELED) { 5042 ibmvfc_dbg(vhost, "Channels Canceled\n"); 5043 vhost->using_channels = 0; 5044 } else { 5045 if (active_queues) 5046 vhost->using_channels = 1; 5047 for (i = 0; i < active_queues; i++) 5048 scrqs->scrqs[i].vios_cookie = 5049 be64_to_cpu(setup->channel_handles[i]); 5050 5051 ibmvfc_dbg(vhost, "Using %u channels\n", 5052 vhost->scsi_scrqs.active_queues); 5053 } 5054 break; 5055 case IBMVFC_MAD_FAILED: 5056 level += ibmvfc_retry_host_init(vhost); 5057 ibmvfc_log(vhost, level, "Channel Setup failed\n"); 5058 fallthrough; 5059 case IBMVFC_MAD_DRIVER_FAILED: 5060 return; 5061 default: 5062 dev_err(vhost->dev, "Invalid Channel Setup response: 0x%x\n", 5063 mad_status); 5064 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 5065 return; 5066 } 5067 5068 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY); 5069 wake_up(&vhost->work_wait_q); 5070 } 5071 5072 static void ibmvfc_channel_setup(struct ibmvfc_host *vhost) 5073 { 5074 struct ibmvfc_channel_setup_mad *mad; 5075 struct ibmvfc_channel_setup *setup_buf = vhost->channel_setup_buf; 5076 struct ibmvfc_event *evt = ibmvfc_get_reserved_event(&vhost->crq); 5077 struct ibmvfc_channels *scrqs = &vhost->scsi_scrqs; 5078 unsigned int num_channels = 5079 min(scrqs->desired_queues, vhost->max_vios_scsi_channels); 5080 int level = IBMVFC_DEFAULT_LOG_LEVEL; 5081 int i; 5082 5083 if (!evt) { 5084 ibmvfc_log(vhost, level, "Channel Setup failed: no available events\n"); 5085 ibmvfc_hard_reset_host(vhost); 5086 return; 5087 } 5088 5089 memset(setup_buf, 0, sizeof(*setup_buf)); 5090 if (num_channels == 0) 5091 setup_buf->flags = cpu_to_be32(IBMVFC_CANCEL_CHANNELS); 5092 else { 5093 setup_buf->num_scsi_subq_channels = cpu_to_be32(num_channels); 5094 for (i = 0; i < num_channels; i++) 5095 setup_buf->channel_handles[i] = cpu_to_be64(scrqs->scrqs[i].cookie); 5096 } 5097 5098 ibmvfc_init_event(evt, ibmvfc_channel_setup_done, IBMVFC_MAD_FORMAT); 5099 mad = &evt->iu.channel_setup; 5100 memset(mad, 0, sizeof(*mad)); 5101 mad->common.version = cpu_to_be32(1); 5102 mad->common.opcode = cpu_to_be32(IBMVFC_CHANNEL_SETUP); 5103 mad->common.length = cpu_to_be16(sizeof(*mad)); 5104 mad->buffer.va = cpu_to_be64(vhost->channel_setup_dma); 5105 mad->buffer.len = cpu_to_be32(sizeof(*vhost->channel_setup_buf)); 5106 5107 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT); 5108 5109 if (!ibmvfc_send_event(evt, vhost, default_timeout)) 5110 ibmvfc_dbg(vhost, "Sent channel setup\n"); 5111 else 5112 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN); 5113 } 5114 5115 static void ibmvfc_channel_enquiry_done(struct ibmvfc_event *evt) 5116 { 5117 struct ibmvfc_host *vhost = evt->vhost; 5118 struct ibmvfc_channel_enquiry *rsp = &evt->xfer_iu->channel_enquiry; 5119 u32 mad_status = be16_to_cpu(rsp->common.status); 5120 int level = IBMVFC_DEFAULT_LOG_LEVEL; 5121 5122 switch (mad_status) { 5123 case IBMVFC_MAD_SUCCESS: 5124 ibmvfc_dbg(vhost, "Channel Enquiry succeeded\n"); 5125 vhost->max_vios_scsi_channels = be32_to_cpu(rsp->num_scsi_subq_channels); 5126 ibmvfc_free_event(evt); 5127 break; 5128 case IBMVFC_MAD_FAILED: 5129 level += ibmvfc_retry_host_init(vhost); 5130 ibmvfc_log(vhost, level, "Channel Enquiry failed\n"); 5131 fallthrough; 5132 case IBMVFC_MAD_DRIVER_FAILED: 5133 ibmvfc_free_event(evt); 5134 return; 5135 default: 5136 dev_err(vhost->dev, "Invalid Channel Enquiry response: 0x%x\n", 5137 mad_status); 5138 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 5139 ibmvfc_free_event(evt); 5140 return; 5141 } 5142 5143 ibmvfc_channel_setup(vhost); 5144 } 5145 5146 static void ibmvfc_channel_enquiry(struct ibmvfc_host *vhost) 5147 { 5148 struct ibmvfc_channel_enquiry *mad; 5149 struct ibmvfc_event *evt = ibmvfc_get_reserved_event(&vhost->crq); 5150 int level = IBMVFC_DEFAULT_LOG_LEVEL; 5151 5152 if (!evt) { 5153 ibmvfc_log(vhost, level, "Channel Enquiry failed: no available events\n"); 5154 ibmvfc_hard_reset_host(vhost); 5155 return; 5156 } 5157 5158 ibmvfc_init_event(evt, ibmvfc_channel_enquiry_done, IBMVFC_MAD_FORMAT); 5159 mad = &evt->iu.channel_enquiry; 5160 memset(mad, 0, sizeof(*mad)); 5161 mad->common.version = cpu_to_be32(1); 5162 mad->common.opcode = cpu_to_be32(IBMVFC_CHANNEL_ENQUIRY); 5163 mad->common.length = cpu_to_be16(sizeof(*mad)); 5164 5165 if (mig_channels_only) 5166 mad->flags |= cpu_to_be32(IBMVFC_NO_CHANNELS_TO_CRQ_SUPPORT); 5167 if (mig_no_less_channels) 5168 mad->flags |= cpu_to_be32(IBMVFC_NO_N_TO_M_CHANNELS_SUPPORT); 5169 5170 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT); 5171 5172 if (!ibmvfc_send_event(evt, vhost, default_timeout)) 5173 ibmvfc_dbg(vhost, "Send channel enquiry\n"); 5174 else 5175 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 5176 } 5177 5178 /** 5179 * ibmvfc_npiv_login_done - Completion handler for NPIV Login 5180 * @evt: ibmvfc event struct 5181 * 5182 **/ 5183 static void ibmvfc_npiv_login_done(struct ibmvfc_event *evt) 5184 { 5185 struct ibmvfc_host *vhost = evt->vhost; 5186 u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_login.common.status); 5187 struct ibmvfc_npiv_login_resp *rsp = &vhost->login_buf->resp; 5188 unsigned int npiv_max_sectors; 5189 int level = IBMVFC_DEFAULT_LOG_LEVEL; 5190 5191 switch (mad_status) { 5192 case IBMVFC_MAD_SUCCESS: 5193 ibmvfc_free_event(evt); 5194 break; 5195 case IBMVFC_MAD_FAILED: 5196 if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error))) 5197 level += ibmvfc_retry_host_init(vhost); 5198 else 5199 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 5200 ibmvfc_log(vhost, level, "NPIV Login failed: %s (%x:%x)\n", 5201 ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)), 5202 be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)); 5203 ibmvfc_free_event(evt); 5204 return; 5205 case IBMVFC_MAD_CRQ_ERROR: 5206 ibmvfc_retry_host_init(vhost); 5207 fallthrough; 5208 case IBMVFC_MAD_DRIVER_FAILED: 5209 ibmvfc_free_event(evt); 5210 return; 5211 default: 5212 dev_err(vhost->dev, "Invalid NPIV Login response: 0x%x\n", mad_status); 5213 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 5214 ibmvfc_free_event(evt); 5215 return; 5216 } 5217 5218 vhost->client_migrated = 0; 5219 5220 if (!(be32_to_cpu(rsp->flags) & IBMVFC_NATIVE_FC)) { 5221 dev_err(vhost->dev, "Virtual adapter does not support FC. %x\n", 5222 rsp->flags); 5223 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 5224 wake_up(&vhost->work_wait_q); 5225 return; 5226 } 5227 5228 if (be32_to_cpu(rsp->max_cmds) <= IBMVFC_NUM_INTERNAL_REQ) { 5229 dev_err(vhost->dev, "Virtual adapter supported queue depth too small: %d\n", 5230 rsp->max_cmds); 5231 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 5232 wake_up(&vhost->work_wait_q); 5233 return; 5234 } 5235 5236 vhost->logged_in = 1; 5237 npiv_max_sectors = min((uint)(be64_to_cpu(rsp->max_dma_len) >> 9), max_sectors); 5238 dev_info(vhost->dev, "Host partition: %s, device: %s %s %s max sectors %u\n", 5239 rsp->partition_name, rsp->device_name, rsp->port_loc_code, 5240 rsp->drc_name, npiv_max_sectors); 5241 5242 fc_host_fabric_name(vhost->host) = be64_to_cpu(rsp->node_name); 5243 fc_host_node_name(vhost->host) = be64_to_cpu(rsp->node_name); 5244 fc_host_port_name(vhost->host) = be64_to_cpu(rsp->port_name); 5245 fc_host_port_id(vhost->host) = be64_to_cpu(rsp->scsi_id); 5246 fc_host_port_type(vhost->host) = FC_PORTTYPE_NPIV; 5247 fc_host_supported_classes(vhost->host) = 0; 5248 if (be32_to_cpu(rsp->service_parms.class1_parms[0]) & 0x80000000) 5249 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS1; 5250 if (be32_to_cpu(rsp->service_parms.class2_parms[0]) & 0x80000000) 5251 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS2; 5252 if (be32_to_cpu(rsp->service_parms.class3_parms[0]) & 0x80000000) 5253 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS3; 5254 fc_host_maxframe_size(vhost->host) = 5255 be16_to_cpu(rsp->service_parms.common.bb_rcv_sz) & 0x0fff; 5256 5257 vhost->host->can_queue = be32_to_cpu(rsp->max_cmds) - IBMVFC_NUM_INTERNAL_REQ; 5258 vhost->host->max_sectors = npiv_max_sectors; 5259 5260 if (ibmvfc_check_caps(vhost, IBMVFC_CAN_SUPPORT_CHANNELS) && vhost->do_enquiry) { 5261 ibmvfc_channel_enquiry(vhost); 5262 } else { 5263 vhost->do_enquiry = 0; 5264 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY); 5265 wake_up(&vhost->work_wait_q); 5266 } 5267 } 5268 5269 /** 5270 * ibmvfc_npiv_login - Sends NPIV login 5271 * @vhost: ibmvfc host struct 5272 * 5273 **/ 5274 static void ibmvfc_npiv_login(struct ibmvfc_host *vhost) 5275 { 5276 struct ibmvfc_npiv_login_mad *mad; 5277 struct ibmvfc_event *evt = ibmvfc_get_reserved_event(&vhost->crq); 5278 5279 if (!evt) { 5280 ibmvfc_dbg(vhost, "NPIV Login failed: no available events\n"); 5281 ibmvfc_hard_reset_host(vhost); 5282 return; 5283 } 5284 5285 ibmvfc_gather_partition_info(vhost); 5286 ibmvfc_set_login_info(vhost); 5287 ibmvfc_init_event(evt, ibmvfc_npiv_login_done, IBMVFC_MAD_FORMAT); 5288 5289 memcpy(vhost->login_buf, &vhost->login_info, sizeof(vhost->login_info)); 5290 mad = &evt->iu.npiv_login; 5291 memset(mad, 0, sizeof(struct ibmvfc_npiv_login_mad)); 5292 mad->common.version = cpu_to_be32(1); 5293 mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGIN); 5294 mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_login_mad)); 5295 mad->buffer.va = cpu_to_be64(vhost->login_buf_dma); 5296 mad->buffer.len = cpu_to_be32(sizeof(*vhost->login_buf)); 5297 5298 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT); 5299 5300 if (!ibmvfc_send_event(evt, vhost, default_timeout)) 5301 ibmvfc_dbg(vhost, "Sent NPIV login\n"); 5302 else 5303 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 5304 } 5305 5306 /** 5307 * ibmvfc_npiv_logout_done - Completion handler for NPIV Logout 5308 * @evt: ibmvfc event struct 5309 * 5310 **/ 5311 static void ibmvfc_npiv_logout_done(struct ibmvfc_event *evt) 5312 { 5313 struct ibmvfc_host *vhost = evt->vhost; 5314 u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_logout.common.status); 5315 5316 ibmvfc_free_event(evt); 5317 5318 switch (mad_status) { 5319 case IBMVFC_MAD_SUCCESS: 5320 if (list_empty(&vhost->crq.sent) && 5321 vhost->action == IBMVFC_HOST_ACTION_LOGO_WAIT) { 5322 ibmvfc_init_host(vhost); 5323 return; 5324 } 5325 break; 5326 case IBMVFC_MAD_FAILED: 5327 case IBMVFC_MAD_NOT_SUPPORTED: 5328 case IBMVFC_MAD_CRQ_ERROR: 5329 case IBMVFC_MAD_DRIVER_FAILED: 5330 default: 5331 ibmvfc_dbg(vhost, "NPIV Logout failed. 0x%X\n", mad_status); 5332 break; 5333 } 5334 5335 ibmvfc_hard_reset_host(vhost); 5336 } 5337 5338 /** 5339 * ibmvfc_npiv_logout - Issue an NPIV Logout 5340 * @vhost: ibmvfc host struct 5341 * 5342 **/ 5343 static void ibmvfc_npiv_logout(struct ibmvfc_host *vhost) 5344 { 5345 struct ibmvfc_npiv_logout_mad *mad; 5346 struct ibmvfc_event *evt; 5347 5348 evt = ibmvfc_get_reserved_event(&vhost->crq); 5349 if (!evt) { 5350 ibmvfc_dbg(vhost, "NPIV Logout failed: no available events\n"); 5351 ibmvfc_hard_reset_host(vhost); 5352 return; 5353 } 5354 5355 ibmvfc_init_event(evt, ibmvfc_npiv_logout_done, IBMVFC_MAD_FORMAT); 5356 5357 mad = &evt->iu.npiv_logout; 5358 memset(mad, 0, sizeof(*mad)); 5359 mad->common.version = cpu_to_be32(1); 5360 mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGOUT); 5361 mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_logout_mad)); 5362 5363 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO_WAIT); 5364 5365 if (!ibmvfc_send_event(evt, vhost, default_timeout)) 5366 ibmvfc_dbg(vhost, "Sent NPIV logout\n"); 5367 else 5368 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 5369 } 5370 5371 /** 5372 * ibmvfc_dev_init_to_do - Is there target initialization work to do? 5373 * @vhost: ibmvfc host struct 5374 * 5375 * Returns: 5376 * 1 if work to do / 0 if not 5377 **/ 5378 static int ibmvfc_dev_init_to_do(struct ibmvfc_host *vhost) 5379 { 5380 struct ibmvfc_target *tgt; 5381 5382 list_for_each_entry(tgt, &vhost->targets, queue) { 5383 if (tgt->action == IBMVFC_TGT_ACTION_INIT || 5384 tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT) 5385 return 1; 5386 } 5387 5388 return 0; 5389 } 5390 5391 /** 5392 * ibmvfc_dev_logo_to_do - Is there target logout work to do? 5393 * @vhost: ibmvfc host struct 5394 * 5395 * Returns: 5396 * 1 if work to do / 0 if not 5397 **/ 5398 static int ibmvfc_dev_logo_to_do(struct ibmvfc_host *vhost) 5399 { 5400 struct ibmvfc_target *tgt; 5401 5402 list_for_each_entry(tgt, &vhost->targets, queue) { 5403 if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT || 5404 tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT) 5405 return 1; 5406 } 5407 return 0; 5408 } 5409 5410 /** 5411 * __ibmvfc_work_to_do - Is there task level work to do? (no locking) 5412 * @vhost: ibmvfc host struct 5413 * 5414 * Returns: 5415 * 1 if work to do / 0 if not 5416 **/ 5417 static int __ibmvfc_work_to_do(struct ibmvfc_host *vhost) 5418 { 5419 struct ibmvfc_target *tgt; 5420 5421 if (kthread_should_stop()) 5422 return 1; 5423 switch (vhost->action) { 5424 case IBMVFC_HOST_ACTION_NONE: 5425 case IBMVFC_HOST_ACTION_INIT_WAIT: 5426 case IBMVFC_HOST_ACTION_LOGO_WAIT: 5427 return 0; 5428 case IBMVFC_HOST_ACTION_TGT_INIT: 5429 case IBMVFC_HOST_ACTION_QUERY_TGTS: 5430 if (vhost->discovery_threads == disc_threads) 5431 return 0; 5432 list_for_each_entry(tgt, &vhost->targets, queue) 5433 if (tgt->action == IBMVFC_TGT_ACTION_INIT) 5434 return 1; 5435 list_for_each_entry(tgt, &vhost->targets, queue) 5436 if (tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT) 5437 return 0; 5438 return 1; 5439 case IBMVFC_HOST_ACTION_TGT_DEL: 5440 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED: 5441 if (vhost->discovery_threads == disc_threads) 5442 return 0; 5443 list_for_each_entry(tgt, &vhost->targets, queue) 5444 if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT) 5445 return 1; 5446 list_for_each_entry(tgt, &vhost->targets, queue) 5447 if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT) 5448 return 0; 5449 return 1; 5450 case IBMVFC_HOST_ACTION_LOGO: 5451 case IBMVFC_HOST_ACTION_INIT: 5452 case IBMVFC_HOST_ACTION_ALLOC_TGTS: 5453 case IBMVFC_HOST_ACTION_QUERY: 5454 case IBMVFC_HOST_ACTION_RESET: 5455 case IBMVFC_HOST_ACTION_REENABLE: 5456 default: 5457 break; 5458 } 5459 5460 return 1; 5461 } 5462 5463 /** 5464 * ibmvfc_work_to_do - Is there task level work to do? 5465 * @vhost: ibmvfc host struct 5466 * 5467 * Returns: 5468 * 1 if work to do / 0 if not 5469 **/ 5470 static int ibmvfc_work_to_do(struct ibmvfc_host *vhost) 5471 { 5472 unsigned long flags; 5473 int rc; 5474 5475 spin_lock_irqsave(vhost->host->host_lock, flags); 5476 rc = __ibmvfc_work_to_do(vhost); 5477 spin_unlock_irqrestore(vhost->host->host_lock, flags); 5478 return rc; 5479 } 5480 5481 /** 5482 * ibmvfc_log_ae - Log async events if necessary 5483 * @vhost: ibmvfc host struct 5484 * @events: events to log 5485 * 5486 **/ 5487 static void ibmvfc_log_ae(struct ibmvfc_host *vhost, int events) 5488 { 5489 if (events & IBMVFC_AE_RSCN) 5490 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_RSCN, 0); 5491 if ((events & IBMVFC_AE_LINKDOWN) && 5492 vhost->state >= IBMVFC_HALTED) 5493 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKDOWN, 0); 5494 if ((events & IBMVFC_AE_LINKUP) && 5495 vhost->state == IBMVFC_INITIALIZING) 5496 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKUP, 0); 5497 } 5498 5499 /** 5500 * ibmvfc_tgt_add_rport - Tell the FC transport about a new remote port 5501 * @tgt: ibmvfc target struct 5502 * 5503 **/ 5504 static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt) 5505 { 5506 struct ibmvfc_host *vhost = tgt->vhost; 5507 struct fc_rport *rport; 5508 unsigned long flags; 5509 5510 tgt_dbg(tgt, "Adding rport\n"); 5511 rport = fc_remote_port_add(vhost->host, 0, &tgt->ids); 5512 spin_lock_irqsave(vhost->host->host_lock, flags); 5513 5514 if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) { 5515 tgt_dbg(tgt, "Deleting rport\n"); 5516 list_del(&tgt->queue); 5517 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT); 5518 spin_unlock_irqrestore(vhost->host->host_lock, flags); 5519 fc_remote_port_delete(rport); 5520 del_timer_sync(&tgt->timer); 5521 kref_put(&tgt->kref, ibmvfc_release_tgt); 5522 return; 5523 } else if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT) { 5524 tgt_dbg(tgt, "Deleting rport with outstanding I/O\n"); 5525 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT); 5526 tgt->rport = NULL; 5527 tgt->init_retries = 0; 5528 spin_unlock_irqrestore(vhost->host->host_lock, flags); 5529 fc_remote_port_delete(rport); 5530 return; 5531 } else if (rport && tgt->action == IBMVFC_TGT_ACTION_DELETED_RPORT) { 5532 spin_unlock_irqrestore(vhost->host->host_lock, flags); 5533 return; 5534 } 5535 5536 if (rport) { 5537 tgt_dbg(tgt, "rport add succeeded\n"); 5538 tgt->rport = rport; 5539 rport->maxframe_size = be16_to_cpu(tgt->service_parms.common.bb_rcv_sz) & 0x0fff; 5540 rport->supported_classes = 0; 5541 tgt->target_id = rport->scsi_target_id; 5542 if (be32_to_cpu(tgt->service_parms.class1_parms[0]) & 0x80000000) 5543 rport->supported_classes |= FC_COS_CLASS1; 5544 if (be32_to_cpu(tgt->service_parms.class2_parms[0]) & 0x80000000) 5545 rport->supported_classes |= FC_COS_CLASS2; 5546 if (be32_to_cpu(tgt->service_parms.class3_parms[0]) & 0x80000000) 5547 rport->supported_classes |= FC_COS_CLASS3; 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 **/ 5558 static 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 **/ 5762 static 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 **/ 5794 static 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 **/ 5863 static 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 5905 req_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)); 5910 reg_crq_failed: 5911 ibmvfc_free_queue(vhost, crq); 5912 return retrc; 5913 } 5914 5915 static 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 5975 irq_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)); 5979 reg_failed: 5980 LEAVE; 5981 return rc; 5982 } 5983 5984 static 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 6014 static 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 6035 static 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 6050 static 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 6081 static 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 6098 static 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 6116 static 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 6128 static 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 **/ 6141 static 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 6158 static 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 **/ 6180 static 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 6238 free_tgt_pool: 6239 mempool_destroy(vhost->tgt_pool); 6240 free_trace: 6241 kfree(vhost->trace); 6242 free_scsi_disc_buffer: 6243 ibmvfc_free_disc_buf(dev, &vhost->scsi_scrqs); 6244 free_login_buffer: 6245 dma_free_coherent(dev, sizeof(*vhost->login_buf), 6246 vhost->login_buf, vhost->login_buf_dma); 6247 free_sg_pool: 6248 dma_pool_destroy(vhost->sg_pool); 6249 unmap_async_crq: 6250 ibmvfc_free_queue(vhost, async_q); 6251 nomem: 6252 LEAVE; 6253 return -ENOMEM; 6254 } 6255 6256 /** 6257 * ibmvfc_rport_add_thread - Worker thread for rport adds 6258 * @work: work struct 6259 * 6260 **/ 6261 static 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 **/ 6316 static 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 = 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 dev_set_drvdata(dev, vhost); 6397 spin_lock(&ibmvfc_driver_lock); 6398 list_add_tail(&vhost->queue, &ibmvfc_head); 6399 spin_unlock(&ibmvfc_driver_lock); 6400 6401 ibmvfc_send_crq_init(vhost); 6402 scsi_scan_host(shost); 6403 return 0; 6404 6405 remove_shost: 6406 scsi_remove_host(shost); 6407 release_crq: 6408 ibmvfc_release_crq_queue(vhost); 6409 kill_kthread: 6410 kthread_stop(vhost->work_thread); 6411 free_host_mem: 6412 ibmvfc_free_mem(vhost); 6413 free_scsi_host: 6414 scsi_host_put(shost); 6415 out: 6416 LEAVE; 6417 return rc; 6418 } 6419 6420 /** 6421 * ibmvfc_remove - Adapter hot plug remove entry point 6422 * @vdev: vio device struct 6423 * 6424 * Return value: 6425 * 0 6426 **/ 6427 static void ibmvfc_remove(struct vio_dev *vdev) 6428 { 6429 struct ibmvfc_host *vhost = dev_get_drvdata(&vdev->dev); 6430 LIST_HEAD(purge); 6431 unsigned long flags; 6432 6433 ENTER; 6434 ibmvfc_remove_trace_file(&vhost->host->shost_dev.kobj, &ibmvfc_trace_attr); 6435 6436 spin_lock_irqsave(vhost->host->host_lock, flags); 6437 ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE); 6438 spin_unlock_irqrestore(vhost->host->host_lock, flags); 6439 6440 ibmvfc_wait_while_resetting(vhost); 6441 kthread_stop(vhost->work_thread); 6442 fc_remove_host(vhost->host); 6443 scsi_remove_host(vhost->host); 6444 6445 spin_lock_irqsave(vhost->host->host_lock, flags); 6446 ibmvfc_purge_requests(vhost, DID_ERROR); 6447 list_splice_init(&vhost->purge, &purge); 6448 spin_unlock_irqrestore(vhost->host->host_lock, flags); 6449 ibmvfc_complete_purge(&purge); 6450 ibmvfc_release_sub_crqs(vhost); 6451 ibmvfc_release_crq_queue(vhost); 6452 6453 ibmvfc_free_mem(vhost); 6454 spin_lock(&ibmvfc_driver_lock); 6455 list_del(&vhost->queue); 6456 spin_unlock(&ibmvfc_driver_lock); 6457 scsi_host_put(vhost->host); 6458 LEAVE; 6459 } 6460 6461 /** 6462 * ibmvfc_resume - Resume from suspend 6463 * @dev: device struct 6464 * 6465 * We may have lost an interrupt across suspend/resume, so kick the 6466 * interrupt handler 6467 * 6468 */ 6469 static int ibmvfc_resume(struct device *dev) 6470 { 6471 unsigned long flags; 6472 struct ibmvfc_host *vhost = dev_get_drvdata(dev); 6473 struct vio_dev *vdev = to_vio_dev(dev); 6474 6475 spin_lock_irqsave(vhost->host->host_lock, flags); 6476 vio_disable_interrupts(vdev); 6477 tasklet_schedule(&vhost->tasklet); 6478 spin_unlock_irqrestore(vhost->host->host_lock, flags); 6479 return 0; 6480 } 6481 6482 /** 6483 * ibmvfc_get_desired_dma - Calculate DMA resources needed by the driver 6484 * @vdev: vio device struct 6485 * 6486 * Return value: 6487 * Number of bytes the driver will need to DMA map at the same time in 6488 * order to perform well. 6489 */ 6490 static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev) 6491 { 6492 unsigned long pool_dma; 6493 6494 pool_dma = (IBMVFC_MAX_SCSI_QUEUES * scsi_qdepth) * sizeof(union ibmvfc_iu); 6495 return pool_dma + ((512 * 1024) * driver_template.cmd_per_lun); 6496 } 6497 6498 static const struct vio_device_id ibmvfc_device_table[] = { 6499 {"fcp", "IBM,vfc-client"}, 6500 { "", "" } 6501 }; 6502 MODULE_DEVICE_TABLE(vio, ibmvfc_device_table); 6503 6504 static const struct dev_pm_ops ibmvfc_pm_ops = { 6505 .resume = ibmvfc_resume 6506 }; 6507 6508 static struct vio_driver ibmvfc_driver = { 6509 .id_table = ibmvfc_device_table, 6510 .probe = ibmvfc_probe, 6511 .remove = ibmvfc_remove, 6512 .get_desired_dma = ibmvfc_get_desired_dma, 6513 .name = IBMVFC_NAME, 6514 .pm = &ibmvfc_pm_ops, 6515 }; 6516 6517 static struct fc_function_template ibmvfc_transport_functions = { 6518 .show_host_fabric_name = 1, 6519 .show_host_node_name = 1, 6520 .show_host_port_name = 1, 6521 .show_host_supported_classes = 1, 6522 .show_host_port_type = 1, 6523 .show_host_port_id = 1, 6524 .show_host_maxframe_size = 1, 6525 6526 .get_host_port_state = ibmvfc_get_host_port_state, 6527 .show_host_port_state = 1, 6528 6529 .get_host_speed = ibmvfc_get_host_speed, 6530 .show_host_speed = 1, 6531 6532 .issue_fc_host_lip = ibmvfc_issue_fc_host_lip, 6533 .terminate_rport_io = ibmvfc_terminate_rport_io, 6534 6535 .show_rport_maxframe_size = 1, 6536 .show_rport_supported_classes = 1, 6537 6538 .set_rport_dev_loss_tmo = ibmvfc_set_rport_dev_loss_tmo, 6539 .show_rport_dev_loss_tmo = 1, 6540 6541 .get_starget_node_name = ibmvfc_get_starget_node_name, 6542 .show_starget_node_name = 1, 6543 6544 .get_starget_port_name = ibmvfc_get_starget_port_name, 6545 .show_starget_port_name = 1, 6546 6547 .get_starget_port_id = ibmvfc_get_starget_port_id, 6548 .show_starget_port_id = 1, 6549 6550 .max_bsg_segments = 1, 6551 .bsg_request = ibmvfc_bsg_request, 6552 .bsg_timeout = ibmvfc_bsg_timeout, 6553 }; 6554 6555 /** 6556 * ibmvfc_module_init - Initialize the ibmvfc module 6557 * 6558 * Return value: 6559 * 0 on success / other on failure 6560 **/ 6561 static int __init ibmvfc_module_init(void) 6562 { 6563 int min_max_sectors = PAGE_SIZE >> 9; 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 /* 6573 * Range check the max_sectors module parameter. The upper bounds is 6574 * implicity checked since the parameter is a ushort. 6575 */ 6576 if (max_sectors < min_max_sectors) { 6577 printk(KERN_ERR IBMVFC_NAME ": max_sectors must be at least %d.\n", 6578 min_max_sectors); 6579 max_sectors = min_max_sectors; 6580 } 6581 6582 ibmvfc_transport_template = fc_attach_transport(&ibmvfc_transport_functions); 6583 if (!ibmvfc_transport_template) 6584 return -ENOMEM; 6585 6586 rc = vio_register_driver(&ibmvfc_driver); 6587 if (rc) 6588 fc_release_transport(ibmvfc_transport_template); 6589 return rc; 6590 } 6591 6592 /** 6593 * ibmvfc_module_exit - Teardown the ibmvfc module 6594 * 6595 * Return value: 6596 * nothing 6597 **/ 6598 static void __exit ibmvfc_module_exit(void) 6599 { 6600 vio_unregister_driver(&ibmvfc_driver); 6601 fc_release_transport(ibmvfc_transport_template); 6602 } 6603 6604 module_init(ibmvfc_module_init); 6605 module_exit(ibmvfc_module_exit); 6606