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