1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * ibmvfc.c -- driver for IBM Power Virtual Fibre Channel Adapter 4 * 5 * Written By: Brian King <brking@linux.vnet.ibm.com>, IBM Corporation 6 * 7 * Copyright (C) IBM Corporation, 2008 8 */ 9 10 #include <linux/module.h> 11 #include <linux/moduleparam.h> 12 #include <linux/dma-mapping.h> 13 #include <linux/dmapool.h> 14 #include <linux/delay.h> 15 #include <linux/interrupt.h> 16 #include <linux/irqdomain.h> 17 #include <linux/kthread.h> 18 #include <linux/slab.h> 19 #include <linux/of.h> 20 #include <linux/pm.h> 21 #include <linux/stringify.h> 22 #include <linux/bsg-lib.h> 23 #include <asm/firmware.h> 24 #include <asm/irq.h> 25 #include <asm/vio.h> 26 #include <scsi/scsi.h> 27 #include <scsi/scsi_cmnd.h> 28 #include <scsi/scsi_host.h> 29 #include <scsi/scsi_device.h> 30 #include <scsi/scsi_tcq.h> 31 #include <scsi/scsi_transport_fc.h> 32 #include <scsi/scsi_bsg_fc.h> 33 #include "ibmvfc.h" 34 35 static unsigned int init_timeout = IBMVFC_INIT_TIMEOUT; 36 static unsigned int default_timeout = IBMVFC_DEFAULT_TIMEOUT; 37 static u64 max_lun = IBMVFC_MAX_LUN; 38 static unsigned int max_targets = IBMVFC_MAX_TARGETS; 39 static unsigned int max_requests = IBMVFC_MAX_REQUESTS_DEFAULT; 40 static u16 max_sectors = IBMVFC_MAX_SECTORS; 41 static u16 scsi_qdepth = IBMVFC_SCSI_QDEPTH; 42 static unsigned int disc_threads = IBMVFC_MAX_DISC_THREADS; 43 static unsigned int ibmvfc_debug = IBMVFC_DEBUG; 44 static unsigned int log_level = IBMVFC_DEFAULT_LOG_LEVEL; 45 static unsigned int cls3_error = IBMVFC_CLS3_ERROR; 46 static unsigned int mq_enabled = IBMVFC_MQ; 47 static unsigned int nr_scsi_hw_queues = IBMVFC_SCSI_HW_QUEUES; 48 static unsigned int nr_scsi_channels = IBMVFC_SCSI_CHANNELS; 49 static unsigned int mig_channels_only = IBMVFC_MIG_NO_SUB_TO_CRQ; 50 static unsigned int mig_no_less_channels = IBMVFC_MIG_NO_N_TO_M; 51 52 static LIST_HEAD(ibmvfc_head); 53 static DEFINE_SPINLOCK(ibmvfc_driver_lock); 54 static struct scsi_transport_template *ibmvfc_transport_template; 55 56 MODULE_DESCRIPTION("IBM Virtual Fibre Channel Driver"); 57 MODULE_AUTHOR("Brian King <brking@linux.vnet.ibm.com>"); 58 MODULE_LICENSE("GPL"); 59 MODULE_VERSION(IBMVFC_DRIVER_VERSION); 60 61 module_param_named(mq, mq_enabled, uint, S_IRUGO); 62 MODULE_PARM_DESC(mq, "Enable multiqueue support. " 63 "[Default=" __stringify(IBMVFC_MQ) "]"); 64 module_param_named(scsi_host_queues, nr_scsi_hw_queues, uint, S_IRUGO); 65 MODULE_PARM_DESC(scsi_host_queues, "Number of SCSI Host submission queues. " 66 "[Default=" __stringify(IBMVFC_SCSI_HW_QUEUES) "]"); 67 module_param_named(scsi_hw_channels, nr_scsi_channels, uint, S_IRUGO); 68 MODULE_PARM_DESC(scsi_hw_channels, "Number of hw scsi channels to request. " 69 "[Default=" __stringify(IBMVFC_SCSI_CHANNELS) "]"); 70 module_param_named(mig_channels_only, mig_channels_only, uint, S_IRUGO); 71 MODULE_PARM_DESC(mig_channels_only, "Prevent migration to non-channelized system. " 72 "[Default=" __stringify(IBMVFC_MIG_NO_SUB_TO_CRQ) "]"); 73 module_param_named(mig_no_less_channels, mig_no_less_channels, uint, S_IRUGO); 74 MODULE_PARM_DESC(mig_no_less_channels, "Prevent migration to system with less channels. " 75 "[Default=" __stringify(IBMVFC_MIG_NO_N_TO_M) "]"); 76 77 module_param_named(init_timeout, init_timeout, uint, S_IRUGO | S_IWUSR); 78 MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds. " 79 "[Default=" __stringify(IBMVFC_INIT_TIMEOUT) "]"); 80 module_param_named(default_timeout, default_timeout, uint, S_IRUGO | S_IWUSR); 81 MODULE_PARM_DESC(default_timeout, 82 "Default timeout in seconds for initialization and EH commands. " 83 "[Default=" __stringify(IBMVFC_DEFAULT_TIMEOUT) "]"); 84 module_param_named(max_requests, max_requests, uint, S_IRUGO); 85 MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter. " 86 "[Default=" __stringify(IBMVFC_MAX_REQUESTS_DEFAULT) "]"); 87 module_param_named(max_sectors, max_sectors, ushort, S_IRUGO); 88 MODULE_PARM_DESC(max_sectors, "Maximum sectors for this adapter. " 89 "[Default=" __stringify(IBMVFC_MAX_SECTORS) "]"); 90 module_param_named(scsi_qdepth, scsi_qdepth, ushort, S_IRUGO); 91 MODULE_PARM_DESC(scsi_qdepth, "Maximum scsi command depth per adapter queue. " 92 "[Default=" __stringify(IBMVFC_SCSI_QDEPTH) "]"); 93 module_param_named(max_lun, max_lun, ullong, S_IRUGO); 94 MODULE_PARM_DESC(max_lun, "Maximum allowed LUN. " 95 "[Default=" __stringify(IBMVFC_MAX_LUN) "]"); 96 module_param_named(max_targets, max_targets, uint, S_IRUGO); 97 MODULE_PARM_DESC(max_targets, "Maximum allowed targets. " 98 "[Default=" __stringify(IBMVFC_MAX_TARGETS) "]"); 99 module_param_named(disc_threads, disc_threads, uint, S_IRUGO); 100 MODULE_PARM_DESC(disc_threads, "Number of device discovery threads to use. " 101 "[Default=" __stringify(IBMVFC_MAX_DISC_THREADS) "]"); 102 module_param_named(debug, ibmvfc_debug, uint, S_IRUGO | S_IWUSR); 103 MODULE_PARM_DESC(debug, "Enable driver debug information. " 104 "[Default=" __stringify(IBMVFC_DEBUG) "]"); 105 module_param_named(log_level, log_level, uint, 0); 106 MODULE_PARM_DESC(log_level, "Set to 0 - 4 for increasing verbosity of device driver. " 107 "[Default=" __stringify(IBMVFC_DEFAULT_LOG_LEVEL) "]"); 108 module_param_named(cls3_error, cls3_error, uint, 0); 109 MODULE_PARM_DESC(cls3_error, "Enable FC Class 3 Error Recovery. " 110 "[Default=" __stringify(IBMVFC_CLS3_ERROR) "]"); 111 112 static const struct { 113 u16 status; 114 u16 error; 115 u8 result; 116 u8 retry; 117 int log; 118 char *name; 119 } cmd_status [] = { 120 { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_ESTABLISH, DID_ERROR, 1, 1, "unable to establish" }, 121 { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_FAULT, DID_OK, 1, 0, "transport fault" }, 122 { IBMVFC_FABRIC_MAPPED, IBMVFC_CMD_TIMEOUT, DID_TIME_OUT, 1, 1, "command timeout" }, 123 { IBMVFC_FABRIC_MAPPED, IBMVFC_ENETDOWN, DID_TRANSPORT_DISRUPTED, 1, 1, "network down" }, 124 { IBMVFC_FABRIC_MAPPED, IBMVFC_HW_FAILURE, DID_ERROR, 1, 1, "hardware failure" }, 125 { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DOWN_ERR, DID_REQUEUE, 0, 0, "link down" }, 126 { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DEAD_ERR, DID_ERROR, 0, 0, "link dead" }, 127 { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_REGISTER, DID_ERROR, 1, 1, "unable to register" }, 128 { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_BUSY, DID_BUS_BUSY, 1, 0, "transport busy" }, 129 { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_DEAD, DID_ERROR, 0, 1, "transport dead" }, 130 { IBMVFC_FABRIC_MAPPED, IBMVFC_CONFIG_ERROR, DID_ERROR, 1, 1, "configuration error" }, 131 { IBMVFC_FABRIC_MAPPED, IBMVFC_NAME_SERVER_FAIL, DID_ERROR, 1, 1, "name server failure" }, 132 { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_HALTED, DID_REQUEUE, 1, 0, "link halted" }, 133 { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_GENERAL, DID_OK, 1, 0, "general transport error" }, 134 135 { IBMVFC_VIOS_FAILURE, IBMVFC_CRQ_FAILURE, DID_REQUEUE, 1, 1, "CRQ failure" }, 136 { IBMVFC_VIOS_FAILURE, IBMVFC_SW_FAILURE, DID_ERROR, 0, 1, "software failure" }, 137 { IBMVFC_VIOS_FAILURE, IBMVFC_INVALID_PARAMETER, DID_ERROR, 0, 1, "invalid parameter" }, 138 { IBMVFC_VIOS_FAILURE, IBMVFC_MISSING_PARAMETER, DID_ERROR, 0, 1, "missing parameter" }, 139 { IBMVFC_VIOS_FAILURE, IBMVFC_HOST_IO_BUS, DID_ERROR, 1, 1, "host I/O bus failure" }, 140 { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED, DID_ERROR, 0, 1, "transaction cancelled" }, 141 { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED_IMPLICIT, DID_ERROR, 0, 1, "transaction cancelled implicit" }, 142 { IBMVFC_VIOS_FAILURE, IBMVFC_INSUFFICIENT_RESOURCE, DID_REQUEUE, 1, 1, "insufficient resources" }, 143 { IBMVFC_VIOS_FAILURE, IBMVFC_PLOGI_REQUIRED, DID_ERROR, 0, 1, "port login required" }, 144 { IBMVFC_VIOS_FAILURE, IBMVFC_COMMAND_FAILED, DID_ERROR, 1, 1, "command failed" }, 145 146 { IBMVFC_FC_FAILURE, IBMVFC_INVALID_ELS_CMD_CODE, DID_ERROR, 0, 1, "invalid ELS command code" }, 147 { IBMVFC_FC_FAILURE, IBMVFC_INVALID_VERSION, DID_ERROR, 0, 1, "invalid version level" }, 148 { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_ERROR, DID_ERROR, 1, 1, "logical error" }, 149 { IBMVFC_FC_FAILURE, IBMVFC_INVALID_CT_IU_SIZE, DID_ERROR, 0, 1, "invalid CT_IU size" }, 150 { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_BUSY, DID_REQUEUE, 1, 0, "logical busy" }, 151 { IBMVFC_FC_FAILURE, IBMVFC_PROTOCOL_ERROR, DID_ERROR, 1, 1, "protocol error" }, 152 { IBMVFC_FC_FAILURE, IBMVFC_UNABLE_TO_PERFORM_REQ, DID_ERROR, 1, 1, "unable to perform request" }, 153 { IBMVFC_FC_FAILURE, IBMVFC_CMD_NOT_SUPPORTED, DID_ERROR, 0, 0, "command not supported" }, 154 { IBMVFC_FC_FAILURE, IBMVFC_SERVER_NOT_AVAIL, DID_ERROR, 0, 1, "server not available" }, 155 { IBMVFC_FC_FAILURE, IBMVFC_CMD_IN_PROGRESS, DID_ERROR, 0, 1, "command already in progress" }, 156 { IBMVFC_FC_FAILURE, IBMVFC_VENDOR_SPECIFIC, DID_ERROR, 1, 1, "vendor specific" }, 157 158 { IBMVFC_FC_SCSI_ERROR, 0, DID_OK, 1, 0, "SCSI error" }, 159 { IBMVFC_FC_SCSI_ERROR, IBMVFC_COMMAND_FAILED, DID_ERROR, 0, 1, "PRLI to device failed." }, 160 }; 161 162 static void ibmvfc_npiv_login(struct ibmvfc_host *); 163 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *); 164 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *); 165 static void ibmvfc_tgt_query_target(struct ibmvfc_target *); 166 static void ibmvfc_npiv_logout(struct ibmvfc_host *); 167 static void ibmvfc_tgt_implicit_logout_and_del(struct ibmvfc_target *); 168 static void ibmvfc_tgt_move_login(struct ibmvfc_target *); 169 170 static void ibmvfc_dereg_sub_crqs(struct ibmvfc_host *, struct ibmvfc_channels *); 171 static void ibmvfc_reg_sub_crqs(struct ibmvfc_host *, struct ibmvfc_channels *); 172 173 static const char *unknown_error = "unknown error"; 174 175 static long h_reg_sub_crq(unsigned long unit_address, unsigned long ioba, 176 unsigned long length, unsigned long *cookie, 177 unsigned long *irq) 178 { 179 unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; 180 long rc; 181 182 rc = plpar_hcall(H_REG_SUB_CRQ, retbuf, unit_address, ioba, length); 183 *cookie = retbuf[0]; 184 *irq = retbuf[1]; 185 186 return rc; 187 } 188 189 static int ibmvfc_check_caps(struct ibmvfc_host *vhost, unsigned long cap_flags) 190 { 191 u64 host_caps = be64_to_cpu(vhost->login_buf->resp.capabilities); 192 193 return (host_caps & cap_flags) ? 1 : 0; 194 } 195 196 static struct ibmvfc_fcp_cmd_iu *ibmvfc_get_fcp_iu(struct ibmvfc_host *vhost, 197 struct ibmvfc_cmd *vfc_cmd) 198 { 199 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) 200 return &vfc_cmd->v2.iu; 201 else 202 return &vfc_cmd->v1.iu; 203 } 204 205 static struct ibmvfc_fcp_rsp *ibmvfc_get_fcp_rsp(struct ibmvfc_host *vhost, 206 struct ibmvfc_cmd *vfc_cmd) 207 { 208 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) 209 return &vfc_cmd->v2.rsp; 210 else 211 return &vfc_cmd->v1.rsp; 212 } 213 214 #ifdef CONFIG_SCSI_IBMVFC_TRACE 215 /** 216 * ibmvfc_trc_start - Log a start trace entry 217 * @evt: ibmvfc event struct 218 * 219 **/ 220 static void ibmvfc_trc_start(struct ibmvfc_event *evt) 221 { 222 struct ibmvfc_host *vhost = evt->vhost; 223 struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd; 224 struct ibmvfc_mad_common *mad = &evt->iu.mad_common; 225 struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd); 226 struct ibmvfc_trace_entry *entry; 227 int index = atomic_inc_return(&vhost->trace_index) & IBMVFC_TRACE_INDEX_MASK; 228 229 entry = &vhost->trace[index]; 230 entry->evt = evt; 231 entry->time = jiffies; 232 entry->fmt = evt->crq.format; 233 entry->type = IBMVFC_TRC_START; 234 235 switch (entry->fmt) { 236 case IBMVFC_CMD_FORMAT: 237 entry->op_code = iu->cdb[0]; 238 entry->scsi_id = be64_to_cpu(vfc_cmd->tgt_scsi_id); 239 entry->lun = scsilun_to_int(&iu->lun); 240 entry->tmf_flags = iu->tmf_flags; 241 entry->u.start.xfer_len = be32_to_cpu(iu->xfer_len); 242 break; 243 case IBMVFC_MAD_FORMAT: 244 entry->op_code = be32_to_cpu(mad->opcode); 245 break; 246 default: 247 break; 248 } 249 } 250 251 /** 252 * ibmvfc_trc_end - Log an end trace entry 253 * @evt: ibmvfc event struct 254 * 255 **/ 256 static void ibmvfc_trc_end(struct ibmvfc_event *evt) 257 { 258 struct ibmvfc_host *vhost = evt->vhost; 259 struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd; 260 struct ibmvfc_mad_common *mad = &evt->xfer_iu->mad_common; 261 struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd); 262 struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd); 263 struct ibmvfc_trace_entry *entry; 264 int index = atomic_inc_return(&vhost->trace_index) & IBMVFC_TRACE_INDEX_MASK; 265 266 entry = &vhost->trace[index]; 267 entry->evt = evt; 268 entry->time = jiffies; 269 entry->fmt = evt->crq.format; 270 entry->type = IBMVFC_TRC_END; 271 272 switch (entry->fmt) { 273 case IBMVFC_CMD_FORMAT: 274 entry->op_code = iu->cdb[0]; 275 entry->scsi_id = be64_to_cpu(vfc_cmd->tgt_scsi_id); 276 entry->lun = scsilun_to_int(&iu->lun); 277 entry->tmf_flags = iu->tmf_flags; 278 entry->u.end.status = be16_to_cpu(vfc_cmd->status); 279 entry->u.end.error = be16_to_cpu(vfc_cmd->error); 280 entry->u.end.fcp_rsp_flags = rsp->flags; 281 entry->u.end.rsp_code = rsp->data.info.rsp_code; 282 entry->u.end.scsi_status = rsp->scsi_status; 283 break; 284 case IBMVFC_MAD_FORMAT: 285 entry->op_code = be32_to_cpu(mad->opcode); 286 entry->u.end.status = be16_to_cpu(mad->status); 287 break; 288 default: 289 break; 290 291 } 292 } 293 294 #else 295 #define ibmvfc_trc_start(evt) do { } while (0) 296 #define ibmvfc_trc_end(evt) do { } while (0) 297 #endif 298 299 /** 300 * ibmvfc_get_err_index - Find the index into cmd_status for the fcp response 301 * @status: status / error class 302 * @error: error 303 * 304 * Return value: 305 * index into cmd_status / -EINVAL on failure 306 **/ 307 static int ibmvfc_get_err_index(u16 status, u16 error) 308 { 309 int i; 310 311 for (i = 0; i < ARRAY_SIZE(cmd_status); i++) 312 if ((cmd_status[i].status & status) == cmd_status[i].status && 313 cmd_status[i].error == error) 314 return i; 315 316 return -EINVAL; 317 } 318 319 /** 320 * ibmvfc_get_cmd_error - Find the error description for the fcp response 321 * @status: status / error class 322 * @error: error 323 * 324 * Return value: 325 * error description string 326 **/ 327 static const char *ibmvfc_get_cmd_error(u16 status, u16 error) 328 { 329 int rc = ibmvfc_get_err_index(status, error); 330 if (rc >= 0) 331 return cmd_status[rc].name; 332 return unknown_error; 333 } 334 335 /** 336 * ibmvfc_get_err_result - Find the scsi status to return for the fcp response 337 * @vhost: ibmvfc host struct 338 * @vfc_cmd: ibmvfc command struct 339 * 340 * Return value: 341 * SCSI result value to return for completed command 342 **/ 343 static int ibmvfc_get_err_result(struct ibmvfc_host *vhost, struct ibmvfc_cmd *vfc_cmd) 344 { 345 int err; 346 struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd); 347 int fc_rsp_len = be32_to_cpu(rsp->fcp_rsp_len); 348 349 if ((rsp->flags & FCP_RSP_LEN_VALID) && 350 ((fc_rsp_len && fc_rsp_len != 4 && fc_rsp_len != 8) || 351 rsp->data.info.rsp_code)) 352 return DID_ERROR << 16; 353 354 err = ibmvfc_get_err_index(be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error)); 355 if (err >= 0) 356 return rsp->scsi_status | (cmd_status[err].result << 16); 357 return rsp->scsi_status | (DID_ERROR << 16); 358 } 359 360 /** 361 * ibmvfc_retry_cmd - Determine if error status is retryable 362 * @status: status / error class 363 * @error: error 364 * 365 * Return value: 366 * 1 if error should be retried / 0 if it should not 367 **/ 368 static int ibmvfc_retry_cmd(u16 status, u16 error) 369 { 370 int rc = ibmvfc_get_err_index(status, error); 371 372 if (rc >= 0) 373 return cmd_status[rc].retry; 374 return 1; 375 } 376 377 static const char *unknown_fc_explain = "unknown fc explain"; 378 379 static const struct { 380 u16 fc_explain; 381 char *name; 382 } ls_explain [] = { 383 { 0x00, "no additional explanation" }, 384 { 0x01, "service parameter error - options" }, 385 { 0x03, "service parameter error - initiator control" }, 386 { 0x05, "service parameter error - recipient control" }, 387 { 0x07, "service parameter error - received data field size" }, 388 { 0x09, "service parameter error - concurrent seq" }, 389 { 0x0B, "service parameter error - credit" }, 390 { 0x0D, "invalid N_Port/F_Port_Name" }, 391 { 0x0E, "invalid node/Fabric Name" }, 392 { 0x0F, "invalid common service parameters" }, 393 { 0x11, "invalid association header" }, 394 { 0x13, "association header required" }, 395 { 0x15, "invalid originator S_ID" }, 396 { 0x17, "invalid OX_ID-RX-ID combination" }, 397 { 0x19, "command (request) already in progress" }, 398 { 0x1E, "N_Port Login requested" }, 399 { 0x1F, "Invalid N_Port_ID" }, 400 }; 401 402 static const struct { 403 u16 fc_explain; 404 char *name; 405 } gs_explain [] = { 406 { 0x00, "no additional explanation" }, 407 { 0x01, "port identifier not registered" }, 408 { 0x02, "port name not registered" }, 409 { 0x03, "node name not registered" }, 410 { 0x04, "class of service not registered" }, 411 { 0x06, "initial process associator not registered" }, 412 { 0x07, "FC-4 TYPEs not registered" }, 413 { 0x08, "symbolic port name not registered" }, 414 { 0x09, "symbolic node name not registered" }, 415 { 0x0A, "port type not registered" }, 416 { 0xF0, "authorization exception" }, 417 { 0xF1, "authentication exception" }, 418 { 0xF2, "data base full" }, 419 { 0xF3, "data base empty" }, 420 { 0xF4, "processing request" }, 421 { 0xF5, "unable to verify connection" }, 422 { 0xF6, "devices not in a common zone" }, 423 }; 424 425 /** 426 * ibmvfc_get_ls_explain - Return the FC Explain description text 427 * @status: FC Explain status 428 * 429 * Returns: 430 * error string 431 **/ 432 static const char *ibmvfc_get_ls_explain(u16 status) 433 { 434 int i; 435 436 for (i = 0; i < ARRAY_SIZE(ls_explain); i++) 437 if (ls_explain[i].fc_explain == status) 438 return ls_explain[i].name; 439 440 return unknown_fc_explain; 441 } 442 443 /** 444 * ibmvfc_get_gs_explain - Return the FC Explain description text 445 * @status: FC Explain status 446 * 447 * Returns: 448 * error string 449 **/ 450 static const char *ibmvfc_get_gs_explain(u16 status) 451 { 452 int i; 453 454 for (i = 0; i < ARRAY_SIZE(gs_explain); i++) 455 if (gs_explain[i].fc_explain == status) 456 return gs_explain[i].name; 457 458 return unknown_fc_explain; 459 } 460 461 static const struct { 462 enum ibmvfc_fc_type fc_type; 463 char *name; 464 } fc_type [] = { 465 { IBMVFC_FABRIC_REJECT, "fabric reject" }, 466 { IBMVFC_PORT_REJECT, "port reject" }, 467 { IBMVFC_LS_REJECT, "ELS reject" }, 468 { IBMVFC_FABRIC_BUSY, "fabric busy" }, 469 { IBMVFC_PORT_BUSY, "port busy" }, 470 { IBMVFC_BASIC_REJECT, "basic reject" }, 471 }; 472 473 static const char *unknown_fc_type = "unknown fc type"; 474 475 /** 476 * ibmvfc_get_fc_type - Return the FC Type description text 477 * @status: FC Type error status 478 * 479 * Returns: 480 * error string 481 **/ 482 static const char *ibmvfc_get_fc_type(u16 status) 483 { 484 int i; 485 486 for (i = 0; i < ARRAY_SIZE(fc_type); i++) 487 if (fc_type[i].fc_type == status) 488 return fc_type[i].name; 489 490 return unknown_fc_type; 491 } 492 493 /** 494 * ibmvfc_set_tgt_action - Set the next init action for the target 495 * @tgt: ibmvfc target struct 496 * @action: action to perform 497 * 498 * Returns: 499 * 0 if action changed / non-zero if not changed 500 **/ 501 static int ibmvfc_set_tgt_action(struct ibmvfc_target *tgt, 502 enum ibmvfc_target_action action) 503 { 504 int rc = -EINVAL; 505 506 switch (tgt->action) { 507 case IBMVFC_TGT_ACTION_LOGOUT_RPORT: 508 if (action == IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT || 509 action == IBMVFC_TGT_ACTION_DEL_RPORT) { 510 tgt->action = action; 511 rc = 0; 512 } 513 break; 514 case IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT: 515 if (action == IBMVFC_TGT_ACTION_DEL_RPORT || 516 action == IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT) { 517 tgt->action = action; 518 rc = 0; 519 } 520 break; 521 case IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT: 522 if (action == IBMVFC_TGT_ACTION_LOGOUT_RPORT) { 523 tgt->action = action; 524 rc = 0; 525 } 526 break; 527 case IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT: 528 if (action == IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT) { 529 tgt->action = action; 530 rc = 0; 531 } 532 break; 533 case IBMVFC_TGT_ACTION_DEL_RPORT: 534 if (action == IBMVFC_TGT_ACTION_DELETED_RPORT) { 535 tgt->action = action; 536 rc = 0; 537 } 538 break; 539 case IBMVFC_TGT_ACTION_DELETED_RPORT: 540 break; 541 default: 542 tgt->action = action; 543 rc = 0; 544 break; 545 } 546 547 if (action >= IBMVFC_TGT_ACTION_LOGOUT_RPORT) 548 tgt->add_rport = 0; 549 550 return rc; 551 } 552 553 /** 554 * ibmvfc_set_host_state - Set the state for the host 555 * @vhost: ibmvfc host struct 556 * @state: state to set host to 557 * 558 * Returns: 559 * 0 if state changed / non-zero if not changed 560 **/ 561 static int ibmvfc_set_host_state(struct ibmvfc_host *vhost, 562 enum ibmvfc_host_state state) 563 { 564 int rc = 0; 565 566 switch (vhost->state) { 567 case IBMVFC_HOST_OFFLINE: 568 rc = -EINVAL; 569 break; 570 default: 571 vhost->state = state; 572 break; 573 } 574 575 return rc; 576 } 577 578 /** 579 * ibmvfc_set_host_action - Set the next init action for the host 580 * @vhost: ibmvfc host struct 581 * @action: action to perform 582 * 583 **/ 584 static void ibmvfc_set_host_action(struct ibmvfc_host *vhost, 585 enum ibmvfc_host_action action) 586 { 587 switch (action) { 588 case IBMVFC_HOST_ACTION_ALLOC_TGTS: 589 if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) 590 vhost->action = action; 591 break; 592 case IBMVFC_HOST_ACTION_LOGO_WAIT: 593 if (vhost->action == IBMVFC_HOST_ACTION_LOGO) 594 vhost->action = action; 595 break; 596 case IBMVFC_HOST_ACTION_INIT_WAIT: 597 if (vhost->action == IBMVFC_HOST_ACTION_INIT) 598 vhost->action = action; 599 break; 600 case IBMVFC_HOST_ACTION_QUERY: 601 switch (vhost->action) { 602 case IBMVFC_HOST_ACTION_INIT_WAIT: 603 case IBMVFC_HOST_ACTION_NONE: 604 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED: 605 vhost->action = action; 606 break; 607 default: 608 break; 609 } 610 break; 611 case IBMVFC_HOST_ACTION_TGT_INIT: 612 if (vhost->action == IBMVFC_HOST_ACTION_ALLOC_TGTS) 613 vhost->action = action; 614 break; 615 case IBMVFC_HOST_ACTION_REENABLE: 616 case IBMVFC_HOST_ACTION_RESET: 617 vhost->action = action; 618 break; 619 case IBMVFC_HOST_ACTION_INIT: 620 case IBMVFC_HOST_ACTION_TGT_DEL: 621 case IBMVFC_HOST_ACTION_LOGO: 622 case IBMVFC_HOST_ACTION_QUERY_TGTS: 623 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED: 624 case IBMVFC_HOST_ACTION_NONE: 625 default: 626 switch (vhost->action) { 627 case IBMVFC_HOST_ACTION_RESET: 628 case IBMVFC_HOST_ACTION_REENABLE: 629 break; 630 default: 631 vhost->action = action; 632 break; 633 } 634 break; 635 } 636 } 637 638 /** 639 * ibmvfc_reinit_host - Re-start host initialization (no NPIV Login) 640 * @vhost: ibmvfc host struct 641 * 642 * Return value: 643 * nothing 644 **/ 645 static void ibmvfc_reinit_host(struct ibmvfc_host *vhost) 646 { 647 if (vhost->action == IBMVFC_HOST_ACTION_NONE && 648 vhost->state == IBMVFC_ACTIVE) { 649 if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) { 650 scsi_block_requests(vhost->host); 651 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY); 652 } 653 } else 654 vhost->reinit = 1; 655 656 wake_up(&vhost->work_wait_q); 657 } 658 659 /** 660 * ibmvfc_del_tgt - Schedule cleanup and removal of the target 661 * @tgt: ibmvfc target struct 662 **/ 663 static void ibmvfc_del_tgt(struct ibmvfc_target *tgt) 664 { 665 if (!ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_LOGOUT_RPORT)) { 666 tgt->job_step = ibmvfc_tgt_implicit_logout_and_del; 667 tgt->init_retries = 0; 668 } 669 wake_up(&tgt->vhost->work_wait_q); 670 } 671 672 /** 673 * ibmvfc_link_down - Handle a link down event from the adapter 674 * @vhost: ibmvfc host struct 675 * @state: ibmvfc host state to enter 676 * 677 **/ 678 static void ibmvfc_link_down(struct ibmvfc_host *vhost, 679 enum ibmvfc_host_state state) 680 { 681 struct ibmvfc_target *tgt; 682 683 ENTER; 684 scsi_block_requests(vhost->host); 685 list_for_each_entry(tgt, &vhost->targets, queue) 686 ibmvfc_del_tgt(tgt); 687 ibmvfc_set_host_state(vhost, state); 688 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL); 689 vhost->events_to_log |= IBMVFC_AE_LINKDOWN; 690 wake_up(&vhost->work_wait_q); 691 LEAVE; 692 } 693 694 /** 695 * ibmvfc_init_host - Start host initialization 696 * @vhost: ibmvfc host struct 697 * 698 * Return value: 699 * nothing 700 **/ 701 static void ibmvfc_init_host(struct ibmvfc_host *vhost) 702 { 703 struct ibmvfc_target *tgt; 704 705 if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) { 706 if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) { 707 dev_err(vhost->dev, 708 "Host initialization retries exceeded. Taking adapter offline\n"); 709 ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE); 710 return; 711 } 712 } 713 714 if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) { 715 memset(vhost->async_crq.msgs.async, 0, PAGE_SIZE); 716 vhost->async_crq.cur = 0; 717 718 list_for_each_entry(tgt, &vhost->targets, queue) { 719 if (vhost->client_migrated) 720 tgt->need_login = 1; 721 else 722 ibmvfc_del_tgt(tgt); 723 } 724 725 scsi_block_requests(vhost->host); 726 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT); 727 vhost->job_step = ibmvfc_npiv_login; 728 wake_up(&vhost->work_wait_q); 729 } 730 } 731 732 /** 733 * ibmvfc_send_crq - Send a CRQ 734 * @vhost: ibmvfc host struct 735 * @word1: the first 64 bits of the data 736 * @word2: the second 64 bits of the data 737 * 738 * Return value: 739 * 0 on success / other on failure 740 **/ 741 static int ibmvfc_send_crq(struct ibmvfc_host *vhost, u64 word1, u64 word2) 742 { 743 struct vio_dev *vdev = to_vio_dev(vhost->dev); 744 return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2); 745 } 746 747 static int ibmvfc_send_sub_crq(struct ibmvfc_host *vhost, u64 cookie, u64 word1, 748 u64 word2, u64 word3, u64 word4) 749 { 750 struct vio_dev *vdev = to_vio_dev(vhost->dev); 751 752 return plpar_hcall_norets(H_SEND_SUB_CRQ, vdev->unit_address, cookie, 753 word1, word2, word3, word4); 754 } 755 756 /** 757 * ibmvfc_send_crq_init - Send a CRQ init message 758 * @vhost: ibmvfc host struct 759 * 760 * Return value: 761 * 0 on success / other on failure 762 **/ 763 static int ibmvfc_send_crq_init(struct ibmvfc_host *vhost) 764 { 765 ibmvfc_dbg(vhost, "Sending CRQ init\n"); 766 return ibmvfc_send_crq(vhost, 0xC001000000000000LL, 0); 767 } 768 769 /** 770 * ibmvfc_send_crq_init_complete - Send a CRQ init complete message 771 * @vhost: ibmvfc host struct 772 * 773 * Return value: 774 * 0 on success / other on failure 775 **/ 776 static int ibmvfc_send_crq_init_complete(struct ibmvfc_host *vhost) 777 { 778 ibmvfc_dbg(vhost, "Sending CRQ init complete\n"); 779 return ibmvfc_send_crq(vhost, 0xC002000000000000LL, 0); 780 } 781 782 /** 783 * ibmvfc_init_event_pool - Allocates and initializes the event pool for a host 784 * @vhost: ibmvfc host who owns the event pool 785 * @queue: ibmvfc queue struct 786 * 787 * Returns zero on success. 788 **/ 789 static int ibmvfc_init_event_pool(struct ibmvfc_host *vhost, 790 struct ibmvfc_queue *queue) 791 { 792 int i; 793 struct ibmvfc_event_pool *pool = &queue->evt_pool; 794 795 ENTER; 796 if (!queue->total_depth) 797 return 0; 798 799 pool->size = queue->total_depth; 800 pool->events = kzalloc_objs(*pool->events, pool->size); 801 if (!pool->events) 802 return -ENOMEM; 803 804 pool->iu_storage = dma_alloc_coherent(vhost->dev, 805 pool->size * sizeof(*pool->iu_storage), 806 &pool->iu_token, 0); 807 808 if (!pool->iu_storage) { 809 kfree(pool->events); 810 return -ENOMEM; 811 } 812 813 INIT_LIST_HEAD(&queue->sent); 814 INIT_LIST_HEAD(&queue->free); 815 queue->evt_free = queue->evt_depth; 816 queue->reserved_free = queue->reserved_depth; 817 spin_lock_init(&queue->l_lock); 818 819 for (i = 0; i < pool->size; ++i) { 820 struct ibmvfc_event *evt = &pool->events[i]; 821 822 /* 823 * evt->active states 824 * 1 = in flight 825 * 0 = being completed 826 * -1 = free/freed 827 */ 828 atomic_set(&evt->active, -1); 829 atomic_set(&evt->free, 1); 830 evt->crq.valid = 0x80; 831 evt->crq.ioba = cpu_to_be64(pool->iu_token + (sizeof(*evt->xfer_iu) * i)); 832 evt->xfer_iu = pool->iu_storage + i; 833 evt->vhost = vhost; 834 evt->queue = queue; 835 evt->ext_list = NULL; 836 list_add_tail(&evt->queue_list, &queue->free); 837 } 838 839 LEAVE; 840 return 0; 841 } 842 843 /** 844 * ibmvfc_free_event_pool - Frees memory of the event pool of a host 845 * @vhost: ibmvfc host who owns the event pool 846 * @queue: ibmvfc queue struct 847 * 848 **/ 849 static void ibmvfc_free_event_pool(struct ibmvfc_host *vhost, 850 struct ibmvfc_queue *queue) 851 { 852 int i; 853 struct ibmvfc_event_pool *pool = &queue->evt_pool; 854 855 ENTER; 856 for (i = 0; i < pool->size; ++i) { 857 list_del(&pool->events[i].queue_list); 858 BUG_ON(atomic_read(&pool->events[i].free) != 1); 859 if (pool->events[i].ext_list) 860 dma_pool_free(vhost->sg_pool, 861 pool->events[i].ext_list, 862 pool->events[i].ext_list_token); 863 } 864 865 kfree(pool->events); 866 dma_free_coherent(vhost->dev, 867 pool->size * sizeof(*pool->iu_storage), 868 pool->iu_storage, pool->iu_token); 869 LEAVE; 870 } 871 872 /** 873 * ibmvfc_free_queue - Deallocate queue 874 * @vhost: ibmvfc host struct 875 * @queue: ibmvfc queue struct 876 * 877 * Unmaps dma and deallocates page for messages 878 **/ 879 static void ibmvfc_free_queue(struct ibmvfc_host *vhost, 880 struct ibmvfc_queue *queue) 881 { 882 struct device *dev = vhost->dev; 883 884 dma_unmap_single(dev, queue->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL); 885 free_page((unsigned long)queue->msgs.handle); 886 queue->msgs.handle = NULL; 887 888 ibmvfc_free_event_pool(vhost, queue); 889 } 890 891 /** 892 * ibmvfc_release_crq_queue - Deallocates data and unregisters CRQ 893 * @vhost: ibmvfc host struct 894 * 895 * Frees irq, deallocates a page for messages, unmaps dma, and unregisters 896 * the crq with the hypervisor. 897 **/ 898 static void ibmvfc_release_crq_queue(struct ibmvfc_host *vhost) 899 { 900 long rc = 0; 901 struct vio_dev *vdev = to_vio_dev(vhost->dev); 902 struct ibmvfc_queue *crq = &vhost->crq; 903 904 ibmvfc_dbg(vhost, "Releasing CRQ\n"); 905 free_irq(vdev->irq, vhost); 906 tasklet_kill(&vhost->tasklet); 907 do { 908 if (rc) 909 msleep(100); 910 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); 911 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc)); 912 913 vhost->state = IBMVFC_NO_CRQ; 914 vhost->logged_in = 0; 915 916 ibmvfc_free_queue(vhost, crq); 917 } 918 919 /** 920 * ibmvfc_reenable_crq_queue - reenables the CRQ 921 * @vhost: ibmvfc host struct 922 * 923 * Return value: 924 * 0 on success / other on failure 925 **/ 926 static int ibmvfc_reenable_crq_queue(struct ibmvfc_host *vhost) 927 { 928 int rc = 0; 929 struct vio_dev *vdev = to_vio_dev(vhost->dev); 930 unsigned long flags; 931 932 ibmvfc_dereg_sub_crqs(vhost, &vhost->scsi_scrqs); 933 934 /* Re-enable the CRQ */ 935 do { 936 if (rc) 937 msleep(100); 938 rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address); 939 } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc)); 940 941 if (rc) 942 dev_err(vhost->dev, "Error enabling adapter (rc=%d)\n", rc); 943 944 spin_lock_irqsave(vhost->host->host_lock, flags); 945 spin_lock(vhost->crq.q_lock); 946 vhost->do_enquiry = 1; 947 vhost->using_channels = 0; 948 spin_unlock(vhost->crq.q_lock); 949 spin_unlock_irqrestore(vhost->host->host_lock, flags); 950 951 ibmvfc_reg_sub_crqs(vhost, &vhost->scsi_scrqs); 952 953 return rc; 954 } 955 956 /** 957 * ibmvfc_reset_crq - resets a crq after a failure 958 * @vhost: ibmvfc host struct 959 * 960 * Return value: 961 * 0 on success / other on failure 962 **/ 963 static int ibmvfc_reset_crq(struct ibmvfc_host *vhost) 964 { 965 int rc = 0; 966 unsigned long flags; 967 struct vio_dev *vdev = to_vio_dev(vhost->dev); 968 struct ibmvfc_queue *crq = &vhost->crq; 969 970 ibmvfc_dereg_sub_crqs(vhost, &vhost->scsi_scrqs); 971 972 /* Close the CRQ */ 973 do { 974 if (rc) 975 msleep(100); 976 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); 977 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc)); 978 979 spin_lock_irqsave(vhost->host->host_lock, flags); 980 spin_lock(vhost->crq.q_lock); 981 vhost->state = IBMVFC_NO_CRQ; 982 vhost->logged_in = 0; 983 vhost->do_enquiry = 1; 984 vhost->using_channels = 0; 985 986 /* Clean out the queue */ 987 memset(crq->msgs.crq, 0, PAGE_SIZE); 988 crq->cur = 0; 989 990 /* And re-open it again */ 991 rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address, 992 crq->msg_token, PAGE_SIZE); 993 994 if (rc == H_CLOSED) 995 /* Adapter is good, but other end is not ready */ 996 dev_warn(vhost->dev, "Partner adapter not ready\n"); 997 else if (rc != 0) 998 dev_warn(vhost->dev, "Couldn't register crq (rc=%d)\n", rc); 999 1000 spin_unlock(vhost->crq.q_lock); 1001 spin_unlock_irqrestore(vhost->host->host_lock, flags); 1002 1003 ibmvfc_reg_sub_crqs(vhost, &vhost->scsi_scrqs); 1004 1005 return rc; 1006 } 1007 1008 /** 1009 * ibmvfc_valid_event - Determines if event is valid. 1010 * @pool: event_pool that contains the event 1011 * @evt: ibmvfc event to be checked for validity 1012 * 1013 * Return value: 1014 * 1 if event is valid / 0 if event is not valid 1015 **/ 1016 static int ibmvfc_valid_event(struct ibmvfc_event_pool *pool, 1017 struct ibmvfc_event *evt) 1018 { 1019 int index = evt - pool->events; 1020 if (index < 0 || index >= pool->size) /* outside of bounds */ 1021 return 0; 1022 if (evt != pool->events + index) /* unaligned */ 1023 return 0; 1024 return 1; 1025 } 1026 1027 /** 1028 * ibmvfc_free_event - Free the specified event 1029 * @evt: ibmvfc_event to be freed 1030 * 1031 **/ 1032 static void ibmvfc_free_event(struct ibmvfc_event *evt) 1033 { 1034 struct ibmvfc_event_pool *pool = &evt->queue->evt_pool; 1035 unsigned long flags; 1036 1037 BUG_ON(!ibmvfc_valid_event(pool, evt)); 1038 BUG_ON(atomic_inc_return(&evt->free) != 1); 1039 BUG_ON(atomic_dec_and_test(&evt->active)); 1040 1041 spin_lock_irqsave(&evt->queue->l_lock, flags); 1042 list_add_tail(&evt->queue_list, &evt->queue->free); 1043 if (evt->reserved) { 1044 evt->reserved = 0; 1045 evt->queue->reserved_free++; 1046 } else { 1047 evt->queue->evt_free++; 1048 } 1049 if (evt->eh_comp) 1050 complete(evt->eh_comp); 1051 spin_unlock_irqrestore(&evt->queue->l_lock, flags); 1052 } 1053 1054 /** 1055 * ibmvfc_scsi_eh_done - EH done function for queuecommand commands 1056 * @evt: ibmvfc event struct 1057 * 1058 * This function does not setup any error status, that must be done 1059 * before this function gets called. 1060 **/ 1061 static void ibmvfc_scsi_eh_done(struct ibmvfc_event *evt) 1062 { 1063 struct scsi_cmnd *cmnd = evt->cmnd; 1064 1065 if (cmnd) { 1066 scsi_dma_unmap(cmnd); 1067 scsi_done(cmnd); 1068 } 1069 1070 ibmvfc_free_event(evt); 1071 } 1072 1073 /** 1074 * ibmvfc_complete_purge - Complete failed command list 1075 * @purge_list: list head of failed commands 1076 * 1077 * This function runs completions on commands to fail as a result of a 1078 * host reset or platform migration. 1079 **/ 1080 static void ibmvfc_complete_purge(struct list_head *purge_list) 1081 { 1082 struct ibmvfc_event *evt, *pos; 1083 1084 list_for_each_entry_safe(evt, pos, purge_list, queue_list) { 1085 list_del(&evt->queue_list); 1086 ibmvfc_trc_end(evt); 1087 evt->done(evt); 1088 } 1089 } 1090 1091 /** 1092 * ibmvfc_fail_request - Fail request with specified error code 1093 * @evt: ibmvfc event struct 1094 * @error_code: error code to fail request with 1095 * 1096 * Return value: 1097 * none 1098 **/ 1099 static void ibmvfc_fail_request(struct ibmvfc_event *evt, int error_code) 1100 { 1101 /* 1102 * Anything we are failing should still be active. Otherwise, it 1103 * implies we already got a response for the command and are doing 1104 * something bad like double completing it. 1105 */ 1106 BUG_ON(!atomic_dec_and_test(&evt->active)); 1107 if (evt->cmnd) { 1108 evt->cmnd->result = (error_code << 16); 1109 evt->done = ibmvfc_scsi_eh_done; 1110 } else 1111 evt->xfer_iu->mad_common.status = cpu_to_be16(IBMVFC_MAD_DRIVER_FAILED); 1112 1113 timer_delete(&evt->timer); 1114 } 1115 1116 /** 1117 * ibmvfc_purge_requests - Our virtual adapter just shut down. Purge any sent requests 1118 * @vhost: ibmvfc host struct 1119 * @error_code: error code to fail requests with 1120 * 1121 * Return value: 1122 * none 1123 **/ 1124 static void ibmvfc_purge_requests(struct ibmvfc_host *vhost, int error_code) 1125 { 1126 struct ibmvfc_event *evt, *pos; 1127 struct ibmvfc_queue *queues = vhost->scsi_scrqs.scrqs; 1128 unsigned long flags; 1129 int hwqs = 0; 1130 int i; 1131 1132 if (vhost->using_channels) 1133 hwqs = vhost->scsi_scrqs.active_queues; 1134 1135 ibmvfc_dbg(vhost, "Purging all requests\n"); 1136 spin_lock_irqsave(&vhost->crq.l_lock, flags); 1137 list_for_each_entry_safe(evt, pos, &vhost->crq.sent, queue_list) 1138 ibmvfc_fail_request(evt, error_code); 1139 list_splice_init(&vhost->crq.sent, &vhost->purge); 1140 spin_unlock_irqrestore(&vhost->crq.l_lock, flags); 1141 1142 for (i = 0; i < hwqs; i++) { 1143 spin_lock_irqsave(queues[i].q_lock, flags); 1144 spin_lock(&queues[i].l_lock); 1145 list_for_each_entry_safe(evt, pos, &queues[i].sent, queue_list) 1146 ibmvfc_fail_request(evt, error_code); 1147 list_splice_init(&queues[i].sent, &vhost->purge); 1148 spin_unlock(&queues[i].l_lock); 1149 spin_unlock_irqrestore(queues[i].q_lock, flags); 1150 } 1151 } 1152 1153 /** 1154 * ibmvfc_hard_reset_host - Reset the connection to the server by breaking the CRQ 1155 * @vhost: struct ibmvfc host to reset 1156 **/ 1157 static void ibmvfc_hard_reset_host(struct ibmvfc_host *vhost) 1158 { 1159 ibmvfc_purge_requests(vhost, DID_ERROR); 1160 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN); 1161 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET); 1162 } 1163 1164 /** 1165 * __ibmvfc_reset_host - Reset the connection to the server (no locking) 1166 * @vhost: struct ibmvfc host to reset 1167 **/ 1168 static void __ibmvfc_reset_host(struct ibmvfc_host *vhost) 1169 { 1170 if (vhost->logged_in && vhost->action != IBMVFC_HOST_ACTION_LOGO_WAIT && 1171 !ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) { 1172 scsi_block_requests(vhost->host); 1173 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO); 1174 vhost->job_step = ibmvfc_npiv_logout; 1175 wake_up(&vhost->work_wait_q); 1176 } else 1177 ibmvfc_hard_reset_host(vhost); 1178 } 1179 1180 /** 1181 * ibmvfc_reset_host - Reset the connection to the server 1182 * @vhost: ibmvfc host struct 1183 **/ 1184 static void ibmvfc_reset_host(struct ibmvfc_host *vhost) 1185 { 1186 unsigned long flags; 1187 1188 spin_lock_irqsave(vhost->host->host_lock, flags); 1189 __ibmvfc_reset_host(vhost); 1190 spin_unlock_irqrestore(vhost->host->host_lock, flags); 1191 } 1192 1193 /** 1194 * ibmvfc_retry_host_init - Retry host initialization if allowed 1195 * @vhost: ibmvfc host struct 1196 * 1197 * Returns: 1 if init will be retried / 0 if not 1198 * 1199 **/ 1200 static int ibmvfc_retry_host_init(struct ibmvfc_host *vhost) 1201 { 1202 int retry = 0; 1203 1204 if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) { 1205 vhost->delay_init = 1; 1206 if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) { 1207 dev_err(vhost->dev, 1208 "Host initialization retries exceeded. Taking adapter offline\n"); 1209 ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE); 1210 } else if (vhost->init_retries == IBMVFC_MAX_HOST_INIT_RETRIES) 1211 __ibmvfc_reset_host(vhost); 1212 else { 1213 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT); 1214 retry = 1; 1215 } 1216 } 1217 1218 wake_up(&vhost->work_wait_q); 1219 return retry; 1220 } 1221 1222 /** 1223 * __ibmvfc_get_target - Find the specified scsi_target (no locking) 1224 * @starget: scsi target struct 1225 * 1226 * Return value: 1227 * ibmvfc_target struct / NULL if not found 1228 **/ 1229 static struct ibmvfc_target *__ibmvfc_get_target(struct scsi_target *starget) 1230 { 1231 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 1232 struct ibmvfc_host *vhost = shost_priv(shost); 1233 struct ibmvfc_target *tgt; 1234 1235 list_for_each_entry(tgt, &vhost->targets, queue) 1236 if (tgt->target_id == starget->id) { 1237 kref_get(&tgt->kref); 1238 return tgt; 1239 } 1240 return NULL; 1241 } 1242 1243 /** 1244 * ibmvfc_get_target - Find the specified scsi_target 1245 * @starget: scsi target struct 1246 * 1247 * Return value: 1248 * ibmvfc_target struct / NULL if not found 1249 **/ 1250 static struct ibmvfc_target *ibmvfc_get_target(struct scsi_target *starget) 1251 { 1252 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 1253 struct ibmvfc_target *tgt; 1254 unsigned long flags; 1255 1256 spin_lock_irqsave(shost->host_lock, flags); 1257 tgt = __ibmvfc_get_target(starget); 1258 spin_unlock_irqrestore(shost->host_lock, flags); 1259 return tgt; 1260 } 1261 1262 /** 1263 * ibmvfc_get_host_speed - Get host port speed 1264 * @shost: scsi host struct 1265 * 1266 * Return value: 1267 * none 1268 **/ 1269 static void ibmvfc_get_host_speed(struct Scsi_Host *shost) 1270 { 1271 struct ibmvfc_host *vhost = shost_priv(shost); 1272 unsigned long flags; 1273 1274 spin_lock_irqsave(shost->host_lock, flags); 1275 if (vhost->state == IBMVFC_ACTIVE) { 1276 switch (be64_to_cpu(vhost->login_buf->resp.link_speed) / 100) { 1277 case 1: 1278 fc_host_speed(shost) = FC_PORTSPEED_1GBIT; 1279 break; 1280 case 2: 1281 fc_host_speed(shost) = FC_PORTSPEED_2GBIT; 1282 break; 1283 case 4: 1284 fc_host_speed(shost) = FC_PORTSPEED_4GBIT; 1285 break; 1286 case 8: 1287 fc_host_speed(shost) = FC_PORTSPEED_8GBIT; 1288 break; 1289 case 10: 1290 fc_host_speed(shost) = FC_PORTSPEED_10GBIT; 1291 break; 1292 case 16: 1293 fc_host_speed(shost) = FC_PORTSPEED_16GBIT; 1294 break; 1295 default: 1296 ibmvfc_log(vhost, 3, "Unknown port speed: %lld Gbit\n", 1297 be64_to_cpu(vhost->login_buf->resp.link_speed) / 100); 1298 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN; 1299 break; 1300 } 1301 } else 1302 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN; 1303 spin_unlock_irqrestore(shost->host_lock, flags); 1304 } 1305 1306 /** 1307 * ibmvfc_get_host_port_state - Get host port state 1308 * @shost: scsi host struct 1309 * 1310 * Return value: 1311 * none 1312 **/ 1313 static void ibmvfc_get_host_port_state(struct Scsi_Host *shost) 1314 { 1315 struct ibmvfc_host *vhost = shost_priv(shost); 1316 unsigned long flags; 1317 1318 spin_lock_irqsave(shost->host_lock, flags); 1319 switch (vhost->state) { 1320 case IBMVFC_INITIALIZING: 1321 case IBMVFC_ACTIVE: 1322 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE; 1323 break; 1324 case IBMVFC_LINK_DOWN: 1325 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN; 1326 break; 1327 case IBMVFC_LINK_DEAD: 1328 case IBMVFC_HOST_OFFLINE: 1329 fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE; 1330 break; 1331 case IBMVFC_HALTED: 1332 fc_host_port_state(shost) = FC_PORTSTATE_BLOCKED; 1333 break; 1334 case IBMVFC_NO_CRQ: 1335 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN; 1336 break; 1337 default: 1338 ibmvfc_log(vhost, 3, "Unknown port state: %d\n", vhost->state); 1339 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN; 1340 break; 1341 } 1342 spin_unlock_irqrestore(shost->host_lock, flags); 1343 } 1344 1345 /** 1346 * ibmvfc_set_rport_dev_loss_tmo - Set rport's device loss timeout 1347 * @rport: rport struct 1348 * @timeout: timeout value 1349 * 1350 * Return value: 1351 * none 1352 **/ 1353 static void ibmvfc_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout) 1354 { 1355 if (timeout) 1356 rport->dev_loss_tmo = timeout; 1357 else 1358 rport->dev_loss_tmo = 1; 1359 } 1360 1361 /** 1362 * ibmvfc_release_tgt - Free memory allocated for a target 1363 * @kref: kref struct 1364 * 1365 **/ 1366 static void ibmvfc_release_tgt(struct kref *kref) 1367 { 1368 struct ibmvfc_target *tgt = container_of(kref, struct ibmvfc_target, kref); 1369 kfree(tgt); 1370 } 1371 1372 /** 1373 * ibmvfc_get_starget_node_name - Get SCSI target's node name 1374 * @starget: scsi target struct 1375 * 1376 * Return value: 1377 * none 1378 **/ 1379 static void ibmvfc_get_starget_node_name(struct scsi_target *starget) 1380 { 1381 struct ibmvfc_target *tgt = ibmvfc_get_target(starget); 1382 fc_starget_port_name(starget) = tgt ? tgt->ids.node_name : 0; 1383 if (tgt) 1384 kref_put(&tgt->kref, ibmvfc_release_tgt); 1385 } 1386 1387 /** 1388 * ibmvfc_get_starget_port_name - Get SCSI target's port name 1389 * @starget: scsi target struct 1390 * 1391 * Return value: 1392 * none 1393 **/ 1394 static void ibmvfc_get_starget_port_name(struct scsi_target *starget) 1395 { 1396 struct ibmvfc_target *tgt = ibmvfc_get_target(starget); 1397 fc_starget_port_name(starget) = tgt ? tgt->ids.port_name : 0; 1398 if (tgt) 1399 kref_put(&tgt->kref, ibmvfc_release_tgt); 1400 } 1401 1402 /** 1403 * ibmvfc_get_starget_port_id - Get SCSI target's port ID 1404 * @starget: scsi target struct 1405 * 1406 * Return value: 1407 * none 1408 **/ 1409 static void ibmvfc_get_starget_port_id(struct scsi_target *starget) 1410 { 1411 struct ibmvfc_target *tgt = ibmvfc_get_target(starget); 1412 fc_starget_port_id(starget) = tgt ? tgt->scsi_id : -1; 1413 if (tgt) 1414 kref_put(&tgt->kref, ibmvfc_release_tgt); 1415 } 1416 1417 /** 1418 * ibmvfc_wait_while_resetting - Wait while the host resets 1419 * @vhost: ibmvfc host struct 1420 * 1421 * Return value: 1422 * 0 on success / other on failure 1423 **/ 1424 static int ibmvfc_wait_while_resetting(struct ibmvfc_host *vhost) 1425 { 1426 long timeout = wait_event_timeout(vhost->init_wait_q, 1427 ((vhost->state == IBMVFC_ACTIVE || 1428 vhost->state == IBMVFC_HOST_OFFLINE || 1429 vhost->state == IBMVFC_LINK_DEAD) && 1430 vhost->action == IBMVFC_HOST_ACTION_NONE), 1431 (init_timeout * HZ)); 1432 1433 return timeout ? 0 : -EIO; 1434 } 1435 1436 /** 1437 * ibmvfc_issue_fc_host_lip - Re-initiate link initialization 1438 * @shost: scsi host struct 1439 * 1440 * Return value: 1441 * 0 on success / other on failure 1442 **/ 1443 static int ibmvfc_issue_fc_host_lip(struct Scsi_Host *shost) 1444 { 1445 struct ibmvfc_host *vhost = shost_priv(shost); 1446 1447 dev_err(vhost->dev, "Initiating host LIP. Resetting connection\n"); 1448 ibmvfc_reset_host(vhost); 1449 return ibmvfc_wait_while_resetting(vhost); 1450 } 1451 1452 /** 1453 * ibmvfc_gather_partition_info - Gather info about the LPAR 1454 * @vhost: ibmvfc host struct 1455 * 1456 * Return value: 1457 * none 1458 **/ 1459 static void ibmvfc_gather_partition_info(struct ibmvfc_host *vhost) 1460 { 1461 struct device_node *rootdn; 1462 const char *name; 1463 const unsigned int *num; 1464 1465 rootdn = of_find_node_by_path("/"); 1466 if (!rootdn) 1467 return; 1468 1469 name = of_get_property(rootdn, "ibm,partition-name", NULL); 1470 if (name) 1471 strscpy(vhost->partition_name, name, sizeof(vhost->partition_name)); 1472 num = of_get_property(rootdn, "ibm,partition-no", NULL); 1473 if (num) 1474 vhost->partition_number = *num; 1475 of_node_put(rootdn); 1476 } 1477 1478 /** 1479 * ibmvfc_set_login_info - Setup info for NPIV login 1480 * @vhost: ibmvfc host struct 1481 * 1482 * Return value: 1483 * none 1484 **/ 1485 static void ibmvfc_set_login_info(struct ibmvfc_host *vhost) 1486 { 1487 struct ibmvfc_npiv_login *login_info = &vhost->login_info; 1488 struct ibmvfc_queue *async_crq = &vhost->async_crq; 1489 struct device_node *of_node = vhost->dev->of_node; 1490 const char *location; 1491 u16 max_cmds; 1492 1493 max_cmds = scsi_qdepth + IBMVFC_NUM_INTERNAL_REQ; 1494 if (mq_enabled) 1495 max_cmds += (scsi_qdepth + IBMVFC_NUM_INTERNAL_SUBQ_REQ) * 1496 vhost->scsi_scrqs.desired_queues; 1497 1498 memset(login_info, 0, sizeof(*login_info)); 1499 1500 login_info->ostype = cpu_to_be32(IBMVFC_OS_LINUX); 1501 login_info->max_dma_len = cpu_to_be64(max_sectors << 9); 1502 login_info->max_payload = cpu_to_be32(sizeof(struct ibmvfc_fcp_cmd_iu)); 1503 login_info->max_response = cpu_to_be32(sizeof(struct ibmvfc_fcp_rsp)); 1504 login_info->partition_num = cpu_to_be32(vhost->partition_number); 1505 login_info->vfc_frame_version = cpu_to_be32(1); 1506 login_info->fcp_version = cpu_to_be16(3); 1507 login_info->flags = cpu_to_be16(IBMVFC_FLUSH_ON_HALT); 1508 if (vhost->client_migrated) 1509 login_info->flags |= cpu_to_be16(IBMVFC_CLIENT_MIGRATED); 1510 1511 login_info->max_cmds = cpu_to_be32(max_cmds); 1512 login_info->capabilities = cpu_to_be64(IBMVFC_CAN_MIGRATE | IBMVFC_CAN_SEND_VF_WWPN); 1513 1514 if (vhost->mq_enabled || vhost->using_channels) 1515 login_info->capabilities |= cpu_to_be64(IBMVFC_CAN_USE_CHANNELS); 1516 1517 login_info->async.va = cpu_to_be64(vhost->async_crq.msg_token); 1518 login_info->async.len = cpu_to_be32(async_crq->size * 1519 sizeof(*async_crq->msgs.async)); 1520 strscpy(login_info->partition_name, vhost->partition_name, 1521 sizeof(login_info->partition_name)); 1522 1523 strscpy(login_info->device_name, 1524 dev_name(&vhost->host->shost_gendev), sizeof(login_info->device_name)); 1525 1526 location = of_get_property(of_node, "ibm,loc-code", NULL); 1527 location = location ? location : dev_name(vhost->dev); 1528 strscpy(login_info->drc_name, location, sizeof(login_info->drc_name)); 1529 } 1530 1531 /** 1532 * __ibmvfc_get_event - Gets the next free event in pool 1533 * @queue: ibmvfc queue struct 1534 * @reserved: event is for a reserved management command 1535 * 1536 * Returns a free event from the pool. 1537 **/ 1538 static struct ibmvfc_event *__ibmvfc_get_event(struct ibmvfc_queue *queue, int reserved) 1539 { 1540 struct ibmvfc_event *evt = NULL; 1541 unsigned long flags; 1542 1543 spin_lock_irqsave(&queue->l_lock, flags); 1544 if (reserved && queue->reserved_free) { 1545 evt = list_entry(queue->free.next, struct ibmvfc_event, queue_list); 1546 evt->reserved = 1; 1547 queue->reserved_free--; 1548 } else if (queue->evt_free) { 1549 evt = list_entry(queue->free.next, struct ibmvfc_event, queue_list); 1550 queue->evt_free--; 1551 } else { 1552 goto out; 1553 } 1554 1555 atomic_set(&evt->free, 0); 1556 list_del(&evt->queue_list); 1557 out: 1558 spin_unlock_irqrestore(&queue->l_lock, flags); 1559 return evt; 1560 } 1561 1562 #define ibmvfc_get_event(queue) __ibmvfc_get_event(queue, 0) 1563 #define ibmvfc_get_reserved_event(queue) __ibmvfc_get_event(queue, 1) 1564 1565 /** 1566 * ibmvfc_locked_done - Calls evt completion with host_lock held 1567 * @evt: ibmvfc evt to complete 1568 * 1569 * All non-scsi command completion callbacks have the expectation that the 1570 * host_lock is held. This callback is used by ibmvfc_init_event to wrap a 1571 * MAD evt with the host_lock. 1572 **/ 1573 static void ibmvfc_locked_done(struct ibmvfc_event *evt) 1574 { 1575 unsigned long flags; 1576 1577 spin_lock_irqsave(evt->vhost->host->host_lock, flags); 1578 evt->_done(evt); 1579 spin_unlock_irqrestore(evt->vhost->host->host_lock, flags); 1580 } 1581 1582 /** 1583 * ibmvfc_init_event - Initialize fields in an event struct that are always 1584 * required. 1585 * @evt: The event 1586 * @done: Routine to call when the event is responded to 1587 * @format: SRP or MAD format 1588 **/ 1589 static void ibmvfc_init_event(struct ibmvfc_event *evt, 1590 void (*done) (struct ibmvfc_event *), u8 format) 1591 { 1592 evt->cmnd = NULL; 1593 evt->sync_iu = NULL; 1594 evt->eh_comp = NULL; 1595 evt->crq.format = format; 1596 if (format == IBMVFC_CMD_FORMAT) 1597 evt->done = done; 1598 else { 1599 evt->_done = done; 1600 evt->done = ibmvfc_locked_done; 1601 } 1602 evt->hwq = 0; 1603 } 1604 1605 /** 1606 * ibmvfc_map_sg_list - Initialize scatterlist 1607 * @scmd: scsi command struct 1608 * @nseg: number of scatterlist segments 1609 * @md: memory descriptor list to initialize 1610 **/ 1611 static void ibmvfc_map_sg_list(struct scsi_cmnd *scmd, int nseg, 1612 struct srp_direct_buf *md) 1613 { 1614 int i; 1615 struct scatterlist *sg; 1616 1617 scsi_for_each_sg(scmd, sg, nseg, i) { 1618 md[i].va = cpu_to_be64(sg_dma_address(sg)); 1619 md[i].len = cpu_to_be32(sg_dma_len(sg)); 1620 md[i].key = 0; 1621 } 1622 } 1623 1624 /** 1625 * ibmvfc_map_sg_data - Maps dma for a scatterlist and initializes descriptor fields 1626 * @scmd: struct scsi_cmnd with the scatterlist 1627 * @evt: ibmvfc event struct 1628 * @vfc_cmd: vfc_cmd that contains the memory descriptor 1629 * @dev: device for which to map dma memory 1630 * 1631 * Returns: 1632 * 0 on success / non-zero on failure 1633 **/ 1634 static int ibmvfc_map_sg_data(struct scsi_cmnd *scmd, 1635 struct ibmvfc_event *evt, 1636 struct ibmvfc_cmd *vfc_cmd, struct device *dev) 1637 { 1638 1639 int sg_mapped; 1640 struct srp_direct_buf *data = &vfc_cmd->ioba; 1641 struct ibmvfc_host *vhost = dev_get_drvdata(dev); 1642 struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(evt->vhost, vfc_cmd); 1643 1644 if (cls3_error) 1645 vfc_cmd->flags |= cpu_to_be16(IBMVFC_CLASS_3_ERR); 1646 1647 sg_mapped = scsi_dma_map(scmd); 1648 if (!sg_mapped) { 1649 vfc_cmd->flags |= cpu_to_be16(IBMVFC_NO_MEM_DESC); 1650 return 0; 1651 } else if (unlikely(sg_mapped < 0)) { 1652 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL) 1653 scmd_printk(KERN_ERR, scmd, "Failed to map DMA buffer for command\n"); 1654 return sg_mapped; 1655 } 1656 1657 if (scmd->sc_data_direction == DMA_TO_DEVICE) { 1658 vfc_cmd->flags |= cpu_to_be16(IBMVFC_WRITE); 1659 iu->add_cdb_len |= IBMVFC_WRDATA; 1660 } else { 1661 vfc_cmd->flags |= cpu_to_be16(IBMVFC_READ); 1662 iu->add_cdb_len |= IBMVFC_RDDATA; 1663 } 1664 1665 if (sg_mapped == 1) { 1666 ibmvfc_map_sg_list(scmd, sg_mapped, data); 1667 return 0; 1668 } 1669 1670 vfc_cmd->flags |= cpu_to_be16(IBMVFC_SCATTERLIST); 1671 1672 if (!evt->ext_list) { 1673 evt->ext_list = dma_pool_alloc(vhost->sg_pool, GFP_ATOMIC, 1674 &evt->ext_list_token); 1675 1676 if (!evt->ext_list) { 1677 scsi_dma_unmap(scmd); 1678 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL) 1679 scmd_printk(KERN_ERR, scmd, "Can't allocate memory for scatterlist\n"); 1680 return -ENOMEM; 1681 } 1682 } 1683 1684 ibmvfc_map_sg_list(scmd, sg_mapped, evt->ext_list); 1685 1686 data->va = cpu_to_be64(evt->ext_list_token); 1687 data->len = cpu_to_be32(sg_mapped * sizeof(struct srp_direct_buf)); 1688 data->key = 0; 1689 return 0; 1690 } 1691 1692 /** 1693 * ibmvfc_timeout - Internal command timeout handler 1694 * @t: struct ibmvfc_event that timed out 1695 * 1696 * Called when an internally generated command times out 1697 **/ 1698 static void ibmvfc_timeout(struct timer_list *t) 1699 { 1700 struct ibmvfc_event *evt = timer_container_of(evt, t, timer); 1701 struct ibmvfc_host *vhost = evt->vhost; 1702 dev_err(vhost->dev, "Command timed out (%p). Resetting connection\n", evt); 1703 ibmvfc_reset_host(vhost); 1704 } 1705 1706 /** 1707 * ibmvfc_send_event - Transforms event to u64 array and calls send_crq() 1708 * @evt: event to be sent 1709 * @vhost: ibmvfc host struct 1710 * @timeout: timeout in seconds - 0 means do not time command 1711 * 1712 * Returns the value returned from ibmvfc_send_crq(). (Zero for success) 1713 **/ 1714 static int ibmvfc_send_event(struct ibmvfc_event *evt, 1715 struct ibmvfc_host *vhost, unsigned long timeout) 1716 { 1717 __be64 *crq_as_u64 = (__be64 *) &evt->crq; 1718 unsigned long flags; 1719 int rc; 1720 1721 /* Copy the IU into the transfer area */ 1722 *evt->xfer_iu = evt->iu; 1723 if (evt->crq.format == IBMVFC_CMD_FORMAT) 1724 evt->xfer_iu->cmd.tag = cpu_to_be64((u64)evt); 1725 else if (evt->crq.format == IBMVFC_MAD_FORMAT) 1726 evt->xfer_iu->mad_common.tag = cpu_to_be64((u64)evt); 1727 else 1728 BUG(); 1729 1730 timer_setup(&evt->timer, ibmvfc_timeout, 0); 1731 1732 if (timeout) { 1733 evt->timer.expires = jiffies + (timeout * HZ); 1734 add_timer(&evt->timer); 1735 } 1736 1737 spin_lock_irqsave(&evt->queue->l_lock, flags); 1738 list_add_tail(&evt->queue_list, &evt->queue->sent); 1739 atomic_set(&evt->active, 1); 1740 1741 mb(); 1742 1743 if (evt->queue->fmt == IBMVFC_SUB_CRQ_FMT) 1744 rc = ibmvfc_send_sub_crq(vhost, 1745 evt->queue->vios_cookie, 1746 be64_to_cpu(crq_as_u64[0]), 1747 be64_to_cpu(crq_as_u64[1]), 1748 0, 0); 1749 else 1750 rc = ibmvfc_send_crq(vhost, be64_to_cpu(crq_as_u64[0]), 1751 be64_to_cpu(crq_as_u64[1])); 1752 1753 if (rc) { 1754 atomic_set(&evt->active, 0); 1755 list_del(&evt->queue_list); 1756 spin_unlock_irqrestore(&evt->queue->l_lock, flags); 1757 timer_delete(&evt->timer); 1758 1759 /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY. 1760 * Firmware will send a CRQ with a transport event (0xFF) to 1761 * tell this client what has happened to the transport. This 1762 * will be handled in ibmvfc_handle_crq() 1763 */ 1764 if (rc == H_CLOSED) { 1765 if (printk_ratelimit()) 1766 dev_warn(vhost->dev, "Send warning. Receive queue closed, will retry.\n"); 1767 if (evt->cmnd) 1768 scsi_dma_unmap(evt->cmnd); 1769 ibmvfc_free_event(evt); 1770 return SCSI_MLQUEUE_HOST_BUSY; 1771 } 1772 1773 dev_err(vhost->dev, "Send error (rc=%d)\n", rc); 1774 if (evt->cmnd) { 1775 evt->cmnd->result = DID_ERROR << 16; 1776 evt->done = ibmvfc_scsi_eh_done; 1777 } else 1778 evt->xfer_iu->mad_common.status = cpu_to_be16(IBMVFC_MAD_CRQ_ERROR); 1779 1780 evt->done(evt); 1781 } else { 1782 spin_unlock_irqrestore(&evt->queue->l_lock, flags); 1783 ibmvfc_trc_start(evt); 1784 } 1785 1786 return 0; 1787 } 1788 1789 /** 1790 * ibmvfc_log_error - Log an error for the failed command if appropriate 1791 * @evt: ibmvfc event to log 1792 * 1793 **/ 1794 static void ibmvfc_log_error(struct ibmvfc_event *evt) 1795 { 1796 struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd; 1797 struct ibmvfc_host *vhost = evt->vhost; 1798 struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd); 1799 struct scsi_cmnd *cmnd = evt->cmnd; 1800 const char *err = unknown_error; 1801 int index = ibmvfc_get_err_index(be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error)); 1802 int logerr = 0; 1803 int rsp_code = 0; 1804 1805 if (index >= 0) { 1806 logerr = cmd_status[index].log; 1807 err = cmd_status[index].name; 1808 } 1809 1810 if (!logerr && (vhost->log_level <= (IBMVFC_DEFAULT_LOG_LEVEL + 1))) 1811 return; 1812 1813 if (rsp->flags & FCP_RSP_LEN_VALID) 1814 rsp_code = rsp->data.info.rsp_code; 1815 1816 scmd_printk(KERN_ERR, cmnd, "Command (%02X) : %s (%x:%x) " 1817 "flags: %x fcp_rsp: %x, resid=%d, scsi_status: %x\n", 1818 cmnd->cmnd[0], err, be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error), 1819 rsp->flags, rsp_code, scsi_get_resid(cmnd), rsp->scsi_status); 1820 } 1821 1822 /** 1823 * ibmvfc_relogin - Log back into the specified device 1824 * @sdev: scsi device struct 1825 * 1826 **/ 1827 static void ibmvfc_relogin(struct scsi_device *sdev) 1828 { 1829 struct ibmvfc_host *vhost = shost_priv(sdev->host); 1830 struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); 1831 struct ibmvfc_target *tgt; 1832 unsigned long flags; 1833 1834 spin_lock_irqsave(vhost->host->host_lock, flags); 1835 list_for_each_entry(tgt, &vhost->targets, queue) { 1836 if (rport == tgt->rport) { 1837 ibmvfc_del_tgt(tgt); 1838 break; 1839 } 1840 } 1841 1842 ibmvfc_reinit_host(vhost); 1843 spin_unlock_irqrestore(vhost->host->host_lock, flags); 1844 } 1845 1846 /** 1847 * ibmvfc_scsi_done - Handle responses from commands 1848 * @evt: ibmvfc event to be handled 1849 * 1850 * Used as a callback when sending scsi cmds. 1851 **/ 1852 static void ibmvfc_scsi_done(struct ibmvfc_event *evt) 1853 { 1854 struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd; 1855 struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(evt->vhost, vfc_cmd); 1856 struct scsi_cmnd *cmnd = evt->cmnd; 1857 u32 rsp_len = 0; 1858 u32 sense_len = be32_to_cpu(rsp->fcp_sense_len); 1859 1860 if (cmnd) { 1861 if (be16_to_cpu(vfc_cmd->response_flags) & IBMVFC_ADAPTER_RESID_VALID) 1862 scsi_set_resid(cmnd, be32_to_cpu(vfc_cmd->adapter_resid)); 1863 else if (rsp->flags & FCP_RESID_UNDER) 1864 scsi_set_resid(cmnd, be32_to_cpu(rsp->fcp_resid)); 1865 else 1866 scsi_set_resid(cmnd, 0); 1867 1868 if (vfc_cmd->status) { 1869 cmnd->result = ibmvfc_get_err_result(evt->vhost, vfc_cmd); 1870 1871 if (rsp->flags & FCP_RSP_LEN_VALID) 1872 rsp_len = be32_to_cpu(rsp->fcp_rsp_len); 1873 if ((sense_len + rsp_len) > SCSI_SENSE_BUFFERSIZE) 1874 sense_len = SCSI_SENSE_BUFFERSIZE - rsp_len; 1875 if ((rsp->flags & FCP_SNS_LEN_VALID) && rsp->fcp_sense_len && rsp_len <= 8) 1876 memcpy(cmnd->sense_buffer, rsp->data.sense + rsp_len, sense_len); 1877 if ((be16_to_cpu(vfc_cmd->status) & IBMVFC_VIOS_FAILURE) && 1878 (be16_to_cpu(vfc_cmd->error) == IBMVFC_PLOGI_REQUIRED)) 1879 ibmvfc_relogin(cmnd->device); 1880 1881 if (!cmnd->result && (!scsi_get_resid(cmnd) || (rsp->flags & FCP_RESID_OVER))) 1882 cmnd->result = (DID_ERROR << 16); 1883 1884 ibmvfc_log_error(evt); 1885 } 1886 1887 if (!cmnd->result && 1888 (scsi_bufflen(cmnd) - scsi_get_resid(cmnd) < cmnd->underflow)) 1889 cmnd->result = (DID_ERROR << 16); 1890 1891 scsi_dma_unmap(cmnd); 1892 scsi_done(cmnd); 1893 } 1894 1895 ibmvfc_free_event(evt); 1896 } 1897 1898 /** 1899 * ibmvfc_host_chkready - Check if the host can accept commands 1900 * @vhost: struct ibmvfc host 1901 * 1902 * Returns: 1903 * 1 if host can accept command / 0 if not 1904 **/ 1905 static inline int ibmvfc_host_chkready(struct ibmvfc_host *vhost) 1906 { 1907 int result = 0; 1908 1909 switch (vhost->state) { 1910 case IBMVFC_LINK_DEAD: 1911 case IBMVFC_HOST_OFFLINE: 1912 result = DID_NO_CONNECT << 16; 1913 break; 1914 case IBMVFC_NO_CRQ: 1915 case IBMVFC_INITIALIZING: 1916 case IBMVFC_HALTED: 1917 case IBMVFC_LINK_DOWN: 1918 result = DID_REQUEUE << 16; 1919 break; 1920 case IBMVFC_ACTIVE: 1921 result = 0; 1922 break; 1923 } 1924 1925 return result; 1926 } 1927 1928 static struct ibmvfc_cmd *ibmvfc_init_vfc_cmd(struct ibmvfc_event *evt, struct scsi_device *sdev) 1929 { 1930 struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); 1931 struct ibmvfc_host *vhost = evt->vhost; 1932 struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd; 1933 struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd); 1934 struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd); 1935 size_t offset; 1936 1937 memset(vfc_cmd, 0, sizeof(*vfc_cmd)); 1938 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) { 1939 offset = offsetof(struct ibmvfc_cmd, v2.rsp); 1940 vfc_cmd->target_wwpn = cpu_to_be64(rport->port_name); 1941 } else 1942 offset = offsetof(struct ibmvfc_cmd, v1.rsp); 1943 vfc_cmd->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offset); 1944 vfc_cmd->resp.len = cpu_to_be32(sizeof(*rsp)); 1945 vfc_cmd->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE); 1946 vfc_cmd->payload_len = cpu_to_be32(sizeof(*iu)); 1947 vfc_cmd->resp_len = cpu_to_be32(sizeof(*rsp)); 1948 vfc_cmd->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata); 1949 vfc_cmd->tgt_scsi_id = cpu_to_be64(rport->port_id); 1950 int_to_scsilun(sdev->lun, &iu->lun); 1951 1952 return vfc_cmd; 1953 } 1954 1955 /** 1956 * ibmvfc_queuecommand - The queuecommand function of the scsi template 1957 * @shost: scsi host struct 1958 * @cmnd: struct scsi_cmnd to be executed 1959 * 1960 * Returns: 1961 * 0 on success / other on failure 1962 **/ 1963 static enum scsi_qc_status ibmvfc_queuecommand(struct Scsi_Host *shost, 1964 struct scsi_cmnd *cmnd) 1965 { 1966 struct ibmvfc_host *vhost = shost_priv(shost); 1967 struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device)); 1968 struct ibmvfc_cmd *vfc_cmd; 1969 struct ibmvfc_fcp_cmd_iu *iu; 1970 struct ibmvfc_event *evt; 1971 u32 tag_and_hwq = blk_mq_unique_tag(scsi_cmd_to_rq(cmnd)); 1972 u16 hwq = blk_mq_unique_tag_to_hwq(tag_and_hwq); 1973 u16 scsi_channel; 1974 int rc; 1975 1976 if (unlikely((rc = fc_remote_port_chkready(rport))) || 1977 unlikely((rc = ibmvfc_host_chkready(vhost)))) { 1978 cmnd->result = rc; 1979 scsi_done(cmnd); 1980 return 0; 1981 } 1982 1983 cmnd->result = (DID_OK << 16); 1984 if (vhost->using_channels) { 1985 scsi_channel = hwq % vhost->scsi_scrqs.active_queues; 1986 evt = ibmvfc_get_event(&vhost->scsi_scrqs.scrqs[scsi_channel]); 1987 if (!evt) 1988 return SCSI_MLQUEUE_HOST_BUSY; 1989 1990 evt->hwq = hwq % vhost->scsi_scrqs.active_queues; 1991 } else { 1992 evt = ibmvfc_get_event(&vhost->crq); 1993 if (!evt) 1994 return SCSI_MLQUEUE_HOST_BUSY; 1995 } 1996 1997 ibmvfc_init_event(evt, ibmvfc_scsi_done, IBMVFC_CMD_FORMAT); 1998 evt->cmnd = cmnd; 1999 2000 vfc_cmd = ibmvfc_init_vfc_cmd(evt, cmnd->device); 2001 iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd); 2002 2003 iu->xfer_len = cpu_to_be32(scsi_bufflen(cmnd)); 2004 memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len); 2005 2006 if (cmnd->flags & SCMD_TAGGED) { 2007 vfc_cmd->task_tag = cpu_to_be64(scsi_cmd_to_rq(cmnd)->tag); 2008 iu->pri_task_attr = IBMVFC_SIMPLE_TASK; 2009 } 2010 2011 vfc_cmd->correlation = cpu_to_be64((u64)evt); 2012 2013 if (likely(!(rc = ibmvfc_map_sg_data(cmnd, evt, vfc_cmd, vhost->dev)))) 2014 return ibmvfc_send_event(evt, vhost, 0); 2015 2016 ibmvfc_free_event(evt); 2017 if (rc == -ENOMEM) 2018 return SCSI_MLQUEUE_HOST_BUSY; 2019 2020 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL) 2021 scmd_printk(KERN_ERR, cmnd, 2022 "Failed to map DMA buffer for command. rc=%d\n", rc); 2023 2024 cmnd->result = DID_ERROR << 16; 2025 scsi_done(cmnd); 2026 return 0; 2027 } 2028 2029 /** 2030 * ibmvfc_sync_completion - Signal that a synchronous command has completed 2031 * @evt: ibmvfc event struct 2032 * 2033 **/ 2034 static void ibmvfc_sync_completion(struct ibmvfc_event *evt) 2035 { 2036 /* copy the response back */ 2037 if (evt->sync_iu) 2038 *evt->sync_iu = *evt->xfer_iu; 2039 2040 complete(&evt->comp); 2041 } 2042 2043 /** 2044 * ibmvfc_bsg_timeout_done - Completion handler for cancelling BSG commands 2045 * @evt: struct ibmvfc_event 2046 * 2047 **/ 2048 static void ibmvfc_bsg_timeout_done(struct ibmvfc_event *evt) 2049 { 2050 struct ibmvfc_host *vhost = evt->vhost; 2051 2052 ibmvfc_free_event(evt); 2053 vhost->aborting_passthru = 0; 2054 dev_info(vhost->dev, "Passthru command cancelled\n"); 2055 } 2056 2057 /** 2058 * ibmvfc_bsg_timeout - Handle a BSG timeout 2059 * @job: struct bsg_job that timed out 2060 * 2061 * Returns: 2062 * 0 on success / other on failure 2063 **/ 2064 static int ibmvfc_bsg_timeout(struct bsg_job *job) 2065 { 2066 struct ibmvfc_host *vhost = shost_priv(fc_bsg_to_shost(job)); 2067 unsigned long port_id = (unsigned long)job->dd_data; 2068 struct ibmvfc_event *evt; 2069 struct ibmvfc_tmf *tmf; 2070 unsigned long flags; 2071 int rc; 2072 2073 ENTER; 2074 spin_lock_irqsave(vhost->host->host_lock, flags); 2075 if (vhost->aborting_passthru || vhost->state != IBMVFC_ACTIVE) { 2076 __ibmvfc_reset_host(vhost); 2077 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2078 return 0; 2079 } 2080 2081 vhost->aborting_passthru = 1; 2082 evt = ibmvfc_get_reserved_event(&vhost->crq); 2083 if (!evt) { 2084 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2085 return -ENOMEM; 2086 } 2087 2088 ibmvfc_init_event(evt, ibmvfc_bsg_timeout_done, IBMVFC_MAD_FORMAT); 2089 2090 tmf = &evt->iu.tmf; 2091 memset(tmf, 0, sizeof(*tmf)); 2092 tmf->common.version = cpu_to_be32(1); 2093 tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD); 2094 tmf->common.length = cpu_to_be16(sizeof(*tmf)); 2095 tmf->scsi_id = cpu_to_be64(port_id); 2096 tmf->cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY); 2097 tmf->my_cancel_key = cpu_to_be32(IBMVFC_INTERNAL_CANCEL_KEY); 2098 rc = ibmvfc_send_event(evt, vhost, default_timeout); 2099 2100 if (rc != 0) { 2101 vhost->aborting_passthru = 0; 2102 dev_err(vhost->dev, "Failed to send cancel event. rc=%d\n", rc); 2103 rc = -EIO; 2104 } else 2105 dev_info(vhost->dev, "Cancelling passthru command to port id 0x%lx\n", 2106 port_id); 2107 2108 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2109 2110 LEAVE; 2111 return rc; 2112 } 2113 2114 /** 2115 * ibmvfc_bsg_plogi - PLOGI into a target to handle a BSG command 2116 * @vhost: struct ibmvfc_host to send command 2117 * @port_id: port ID to send command 2118 * 2119 * Returns: 2120 * 0 on success / other on failure 2121 **/ 2122 static int ibmvfc_bsg_plogi(struct ibmvfc_host *vhost, unsigned int port_id) 2123 { 2124 struct ibmvfc_port_login *plogi; 2125 struct ibmvfc_target *tgt; 2126 struct ibmvfc_event *evt; 2127 union ibmvfc_iu rsp_iu; 2128 unsigned long flags; 2129 int rc = 0, issue_login = 1; 2130 2131 ENTER; 2132 spin_lock_irqsave(vhost->host->host_lock, flags); 2133 list_for_each_entry(tgt, &vhost->targets, queue) { 2134 if (tgt->scsi_id == port_id) { 2135 issue_login = 0; 2136 break; 2137 } 2138 } 2139 2140 if (!issue_login) 2141 goto unlock_out; 2142 if (unlikely((rc = ibmvfc_host_chkready(vhost)))) 2143 goto unlock_out; 2144 2145 evt = ibmvfc_get_reserved_event(&vhost->crq); 2146 if (!evt) { 2147 rc = -ENOMEM; 2148 goto unlock_out; 2149 } 2150 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT); 2151 plogi = &evt->iu.plogi; 2152 memset(plogi, 0, sizeof(*plogi)); 2153 plogi->common.version = cpu_to_be32(1); 2154 plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN); 2155 plogi->common.length = cpu_to_be16(sizeof(*plogi)); 2156 plogi->scsi_id = cpu_to_be64(port_id); 2157 evt->sync_iu = &rsp_iu; 2158 init_completion(&evt->comp); 2159 2160 rc = ibmvfc_send_event(evt, vhost, default_timeout); 2161 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2162 2163 if (rc) 2164 return -EIO; 2165 2166 wait_for_completion(&evt->comp); 2167 2168 if (rsp_iu.plogi.common.status) 2169 rc = -EIO; 2170 2171 spin_lock_irqsave(vhost->host->host_lock, flags); 2172 ibmvfc_free_event(evt); 2173 unlock_out: 2174 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2175 LEAVE; 2176 return rc; 2177 } 2178 2179 /** 2180 * ibmvfc_bsg_request - Handle a BSG request 2181 * @job: struct bsg_job to be executed 2182 * 2183 * Returns: 2184 * 0 on success / other on failure 2185 **/ 2186 static int ibmvfc_bsg_request(struct bsg_job *job) 2187 { 2188 struct ibmvfc_host *vhost = shost_priv(fc_bsg_to_shost(job)); 2189 struct fc_rport *rport = fc_bsg_to_rport(job); 2190 struct ibmvfc_passthru_mad *mad; 2191 struct ibmvfc_event *evt; 2192 union ibmvfc_iu rsp_iu; 2193 unsigned long flags, port_id = -1; 2194 struct fc_bsg_request *bsg_request = job->request; 2195 struct fc_bsg_reply *bsg_reply = job->reply; 2196 unsigned int code = bsg_request->msgcode; 2197 int rc = 0, req_seg, rsp_seg, issue_login = 0; 2198 u32 fc_flags, rsp_len; 2199 2200 ENTER; 2201 bsg_reply->reply_payload_rcv_len = 0; 2202 if (rport) 2203 port_id = rport->port_id; 2204 2205 switch (code) { 2206 case FC_BSG_HST_ELS_NOLOGIN: 2207 port_id = (bsg_request->rqst_data.h_els.port_id[0] << 16) | 2208 (bsg_request->rqst_data.h_els.port_id[1] << 8) | 2209 bsg_request->rqst_data.h_els.port_id[2]; 2210 fallthrough; 2211 case FC_BSG_RPT_ELS: 2212 fc_flags = IBMVFC_FC_ELS; 2213 break; 2214 case FC_BSG_HST_CT: 2215 issue_login = 1; 2216 port_id = (bsg_request->rqst_data.h_ct.port_id[0] << 16) | 2217 (bsg_request->rqst_data.h_ct.port_id[1] << 8) | 2218 bsg_request->rqst_data.h_ct.port_id[2]; 2219 fallthrough; 2220 case FC_BSG_RPT_CT: 2221 fc_flags = IBMVFC_FC_CT_IU; 2222 break; 2223 default: 2224 return -ENOTSUPP; 2225 } 2226 2227 if (port_id == -1) 2228 return -EINVAL; 2229 if (!mutex_trylock(&vhost->passthru_mutex)) 2230 return -EBUSY; 2231 2232 job->dd_data = (void *)port_id; 2233 req_seg = dma_map_sg(vhost->dev, job->request_payload.sg_list, 2234 job->request_payload.sg_cnt, DMA_TO_DEVICE); 2235 2236 if (!req_seg) { 2237 mutex_unlock(&vhost->passthru_mutex); 2238 return -ENOMEM; 2239 } 2240 2241 rsp_seg = dma_map_sg(vhost->dev, job->reply_payload.sg_list, 2242 job->reply_payload.sg_cnt, DMA_FROM_DEVICE); 2243 2244 if (!rsp_seg) { 2245 dma_unmap_sg(vhost->dev, job->request_payload.sg_list, 2246 job->request_payload.sg_cnt, DMA_TO_DEVICE); 2247 mutex_unlock(&vhost->passthru_mutex); 2248 return -ENOMEM; 2249 } 2250 2251 if (req_seg > 1 || rsp_seg > 1) { 2252 rc = -EINVAL; 2253 goto out; 2254 } 2255 2256 if (issue_login) 2257 rc = ibmvfc_bsg_plogi(vhost, port_id); 2258 2259 spin_lock_irqsave(vhost->host->host_lock, flags); 2260 2261 if (unlikely(rc || (rport && (rc = fc_remote_port_chkready(rport)))) || 2262 unlikely((rc = ibmvfc_host_chkready(vhost)))) { 2263 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2264 goto out; 2265 } 2266 2267 evt = ibmvfc_get_reserved_event(&vhost->crq); 2268 if (!evt) { 2269 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2270 rc = -ENOMEM; 2271 goto out; 2272 } 2273 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT); 2274 mad = &evt->iu.passthru; 2275 2276 memset(mad, 0, sizeof(*mad)); 2277 mad->common.version = cpu_to_be32(1); 2278 mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU); 2279 mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu)); 2280 2281 mad->cmd_ioba.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + 2282 offsetof(struct ibmvfc_passthru_mad, iu)); 2283 mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu)); 2284 2285 mad->iu.cmd_len = cpu_to_be32(job->request_payload.payload_len); 2286 mad->iu.rsp_len = cpu_to_be32(job->reply_payload.payload_len); 2287 mad->iu.flags = cpu_to_be32(fc_flags); 2288 mad->iu.cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY); 2289 2290 mad->iu.cmd.va = cpu_to_be64(sg_dma_address(job->request_payload.sg_list)); 2291 mad->iu.cmd.len = cpu_to_be32(sg_dma_len(job->request_payload.sg_list)); 2292 mad->iu.rsp.va = cpu_to_be64(sg_dma_address(job->reply_payload.sg_list)); 2293 mad->iu.rsp.len = cpu_to_be32(sg_dma_len(job->reply_payload.sg_list)); 2294 mad->iu.scsi_id = cpu_to_be64(port_id); 2295 mad->iu.tag = cpu_to_be64((u64)evt); 2296 rsp_len = be32_to_cpu(mad->iu.rsp.len); 2297 2298 evt->sync_iu = &rsp_iu; 2299 init_completion(&evt->comp); 2300 rc = ibmvfc_send_event(evt, vhost, 0); 2301 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2302 2303 if (rc) { 2304 rc = -EIO; 2305 goto out; 2306 } 2307 2308 wait_for_completion(&evt->comp); 2309 2310 if (rsp_iu.passthru.common.status) 2311 rc = -EIO; 2312 else 2313 bsg_reply->reply_payload_rcv_len = rsp_len; 2314 2315 spin_lock_irqsave(vhost->host->host_lock, flags); 2316 ibmvfc_free_event(evt); 2317 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2318 bsg_reply->result = rc; 2319 bsg_job_done(job, bsg_reply->result, 2320 bsg_reply->reply_payload_rcv_len); 2321 rc = 0; 2322 out: 2323 dma_unmap_sg(vhost->dev, job->request_payload.sg_list, 2324 job->request_payload.sg_cnt, DMA_TO_DEVICE); 2325 dma_unmap_sg(vhost->dev, job->reply_payload.sg_list, 2326 job->reply_payload.sg_cnt, DMA_FROM_DEVICE); 2327 mutex_unlock(&vhost->passthru_mutex); 2328 LEAVE; 2329 return rc; 2330 } 2331 2332 /** 2333 * ibmvfc_reset_device - Reset the device with the specified reset type 2334 * @sdev: scsi device to reset 2335 * @type: reset type 2336 * @desc: reset type description for log messages 2337 * 2338 * Returns: 2339 * 0 on success / other on failure 2340 **/ 2341 static int ibmvfc_reset_device(struct scsi_device *sdev, int type, char *desc) 2342 { 2343 struct ibmvfc_host *vhost = shost_priv(sdev->host); 2344 struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); 2345 struct ibmvfc_cmd *tmf; 2346 struct ibmvfc_event *evt = NULL; 2347 union ibmvfc_iu rsp_iu; 2348 struct ibmvfc_fcp_cmd_iu *iu; 2349 struct ibmvfc_fcp_rsp *fc_rsp = ibmvfc_get_fcp_rsp(vhost, &rsp_iu.cmd); 2350 int rsp_rc = -EBUSY; 2351 unsigned long flags; 2352 int rsp_code = 0; 2353 2354 spin_lock_irqsave(vhost->host->host_lock, flags); 2355 if (vhost->state == IBMVFC_ACTIVE) { 2356 if (vhost->using_channels) 2357 evt = ibmvfc_get_event(&vhost->scsi_scrqs.scrqs[0]); 2358 else 2359 evt = ibmvfc_get_event(&vhost->crq); 2360 2361 if (!evt) { 2362 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2363 return -ENOMEM; 2364 } 2365 2366 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT); 2367 tmf = ibmvfc_init_vfc_cmd(evt, sdev); 2368 iu = ibmvfc_get_fcp_iu(vhost, tmf); 2369 2370 tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF)); 2371 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) 2372 tmf->target_wwpn = cpu_to_be64(rport->port_name); 2373 iu->tmf_flags = type; 2374 evt->sync_iu = &rsp_iu; 2375 2376 init_completion(&evt->comp); 2377 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout); 2378 } 2379 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2380 2381 if (rsp_rc != 0) { 2382 sdev_printk(KERN_ERR, sdev, "Failed to send %s reset event. rc=%d\n", 2383 desc, rsp_rc); 2384 return -EIO; 2385 } 2386 2387 sdev_printk(KERN_INFO, sdev, "Resetting %s\n", desc); 2388 wait_for_completion(&evt->comp); 2389 2390 if (rsp_iu.cmd.status) 2391 rsp_code = ibmvfc_get_err_result(vhost, &rsp_iu.cmd); 2392 2393 if (rsp_code) { 2394 if (fc_rsp->flags & FCP_RSP_LEN_VALID) 2395 rsp_code = fc_rsp->data.info.rsp_code; 2396 2397 sdev_printk(KERN_ERR, sdev, "%s reset failed: %s (%x:%x) " 2398 "flags: %x fcp_rsp: %x, scsi_status: %x\n", desc, 2399 ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)), 2400 be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error), fc_rsp->flags, rsp_code, 2401 fc_rsp->scsi_status); 2402 rsp_rc = -EIO; 2403 } else 2404 sdev_printk(KERN_INFO, sdev, "%s reset successful\n", desc); 2405 2406 spin_lock_irqsave(vhost->host->host_lock, flags); 2407 ibmvfc_free_event(evt); 2408 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2409 return rsp_rc; 2410 } 2411 2412 /** 2413 * ibmvfc_match_rport - Match function for specified remote port 2414 * @evt: ibmvfc event struct 2415 * @rport: device to match 2416 * 2417 * Returns: 2418 * 1 if event matches rport / 0 if event does not match rport 2419 **/ 2420 static int ibmvfc_match_rport(struct ibmvfc_event *evt, void *rport) 2421 { 2422 struct fc_rport *cmd_rport; 2423 2424 if (evt->cmnd) { 2425 cmd_rport = starget_to_rport(scsi_target(evt->cmnd->device)); 2426 if (cmd_rport == rport) 2427 return 1; 2428 } 2429 return 0; 2430 } 2431 2432 /** 2433 * ibmvfc_match_target - Match function for specified target 2434 * @evt: ibmvfc event struct 2435 * @device: device to match (starget) 2436 * 2437 * Returns: 2438 * 1 if event matches starget / 0 if event does not match starget 2439 **/ 2440 static int ibmvfc_match_target(struct ibmvfc_event *evt, void *device) 2441 { 2442 if (evt->cmnd && scsi_target(evt->cmnd->device) == device) 2443 return 1; 2444 return 0; 2445 } 2446 2447 /** 2448 * ibmvfc_match_lun - Match function for specified LUN 2449 * @evt: ibmvfc event struct 2450 * @device: device to match (sdev) 2451 * 2452 * Returns: 2453 * 1 if event matches sdev / 0 if event does not match sdev 2454 **/ 2455 static int ibmvfc_match_lun(struct ibmvfc_event *evt, void *device) 2456 { 2457 if (evt->cmnd && evt->cmnd->device == device) 2458 return 1; 2459 return 0; 2460 } 2461 2462 /** 2463 * ibmvfc_event_is_free - Check if event is free or not 2464 * @evt: ibmvfc event struct 2465 * 2466 * Returns: 2467 * true / false 2468 **/ 2469 static bool ibmvfc_event_is_free(struct ibmvfc_event *evt) 2470 { 2471 struct ibmvfc_event *loop_evt; 2472 2473 list_for_each_entry(loop_evt, &evt->queue->free, queue_list) 2474 if (loop_evt == evt) 2475 return true; 2476 2477 return false; 2478 } 2479 2480 /** 2481 * ibmvfc_wait_for_ops - Wait for ops to complete 2482 * @vhost: ibmvfc host struct 2483 * @device: device to match (starget or sdev) 2484 * @match: match function 2485 * 2486 * Returns: 2487 * SUCCESS / FAILED 2488 **/ 2489 static int ibmvfc_wait_for_ops(struct ibmvfc_host *vhost, void *device, 2490 int (*match) (struct ibmvfc_event *, void *)) 2491 { 2492 struct ibmvfc_event *evt; 2493 DECLARE_COMPLETION_ONSTACK(comp); 2494 int wait, i, q_index, q_size; 2495 unsigned long flags; 2496 signed long timeout = IBMVFC_ABORT_WAIT_TIMEOUT * HZ; 2497 struct ibmvfc_queue *queues; 2498 2499 ENTER; 2500 if (vhost->mq_enabled && vhost->using_channels) { 2501 queues = vhost->scsi_scrqs.scrqs; 2502 q_size = vhost->scsi_scrqs.active_queues; 2503 } else { 2504 queues = &vhost->crq; 2505 q_size = 1; 2506 } 2507 2508 do { 2509 wait = 0; 2510 spin_lock_irqsave(vhost->host->host_lock, flags); 2511 for (q_index = 0; q_index < q_size; q_index++) { 2512 spin_lock(&queues[q_index].l_lock); 2513 for (i = 0; i < queues[q_index].evt_pool.size; i++) { 2514 evt = &queues[q_index].evt_pool.events[i]; 2515 if (!ibmvfc_event_is_free(evt)) { 2516 if (match(evt, device)) { 2517 evt->eh_comp = ∁ 2518 wait++; 2519 } 2520 } 2521 } 2522 spin_unlock(&queues[q_index].l_lock); 2523 } 2524 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2525 2526 if (wait) { 2527 timeout = wait_for_completion_timeout(&comp, timeout); 2528 2529 if (!timeout) { 2530 wait = 0; 2531 spin_lock_irqsave(vhost->host->host_lock, flags); 2532 for (q_index = 0; q_index < q_size; q_index++) { 2533 spin_lock(&queues[q_index].l_lock); 2534 for (i = 0; i < queues[q_index].evt_pool.size; i++) { 2535 evt = &queues[q_index].evt_pool.events[i]; 2536 if (!ibmvfc_event_is_free(evt)) { 2537 if (match(evt, device)) { 2538 evt->eh_comp = NULL; 2539 wait++; 2540 } 2541 } 2542 } 2543 spin_unlock(&queues[q_index].l_lock); 2544 } 2545 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2546 if (wait) 2547 dev_err(vhost->dev, "Timed out waiting for aborted commands\n"); 2548 LEAVE; 2549 return wait ? FAILED : SUCCESS; 2550 } 2551 } 2552 } while (wait); 2553 2554 LEAVE; 2555 return SUCCESS; 2556 } 2557 2558 static struct ibmvfc_event *ibmvfc_init_tmf(struct ibmvfc_queue *queue, 2559 struct scsi_device *sdev, 2560 int type) 2561 { 2562 struct ibmvfc_host *vhost = shost_priv(sdev->host); 2563 struct scsi_target *starget = scsi_target(sdev); 2564 struct fc_rport *rport = starget_to_rport(starget); 2565 struct ibmvfc_event *evt; 2566 struct ibmvfc_tmf *tmf; 2567 2568 evt = ibmvfc_get_reserved_event(queue); 2569 if (!evt) 2570 return NULL; 2571 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT); 2572 2573 tmf = &evt->iu.tmf; 2574 memset(tmf, 0, sizeof(*tmf)); 2575 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) { 2576 tmf->common.version = cpu_to_be32(2); 2577 tmf->target_wwpn = cpu_to_be64(rport->port_name); 2578 } else { 2579 tmf->common.version = cpu_to_be32(1); 2580 } 2581 tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD); 2582 tmf->common.length = cpu_to_be16(sizeof(*tmf)); 2583 tmf->scsi_id = cpu_to_be64(rport->port_id); 2584 int_to_scsilun(sdev->lun, &tmf->lun); 2585 if (!ibmvfc_check_caps(vhost, IBMVFC_CAN_SUPPRESS_ABTS)) 2586 type &= ~IBMVFC_TMF_SUPPRESS_ABTS; 2587 if (vhost->state == IBMVFC_ACTIVE) 2588 tmf->flags = cpu_to_be32((type | IBMVFC_TMF_LUA_VALID)); 2589 else 2590 tmf->flags = cpu_to_be32(((type & IBMVFC_TMF_SUPPRESS_ABTS) | IBMVFC_TMF_LUA_VALID)); 2591 tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata); 2592 tmf->my_cancel_key = cpu_to_be32((unsigned long)starget->hostdata); 2593 2594 init_completion(&evt->comp); 2595 2596 return evt; 2597 } 2598 2599 static int ibmvfc_cancel_all_mq(struct scsi_device *sdev, int type) 2600 { 2601 struct ibmvfc_host *vhost = shost_priv(sdev->host); 2602 struct ibmvfc_event *evt, *found_evt, *temp; 2603 struct ibmvfc_queue *queues = vhost->scsi_scrqs.scrqs; 2604 unsigned long flags; 2605 int num_hwq, i; 2606 int fail = 0; 2607 LIST_HEAD(cancelq); 2608 u16 status; 2609 2610 ENTER; 2611 spin_lock_irqsave(vhost->host->host_lock, flags); 2612 num_hwq = vhost->scsi_scrqs.active_queues; 2613 for (i = 0; i < num_hwq; i++) { 2614 spin_lock(queues[i].q_lock); 2615 spin_lock(&queues[i].l_lock); 2616 found_evt = NULL; 2617 list_for_each_entry(evt, &queues[i].sent, queue_list) { 2618 if (evt->cmnd && evt->cmnd->device == sdev) { 2619 found_evt = evt; 2620 break; 2621 } 2622 } 2623 spin_unlock(&queues[i].l_lock); 2624 2625 if (found_evt && vhost->logged_in) { 2626 evt = ibmvfc_init_tmf(&queues[i], sdev, type); 2627 if (!evt) { 2628 spin_unlock(queues[i].q_lock); 2629 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2630 return -ENOMEM; 2631 } 2632 evt->sync_iu = &queues[i].cancel_rsp; 2633 ibmvfc_send_event(evt, vhost, default_timeout); 2634 list_add_tail(&evt->cancel, &cancelq); 2635 } 2636 2637 spin_unlock(queues[i].q_lock); 2638 } 2639 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2640 2641 if (list_empty(&cancelq)) { 2642 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL) 2643 sdev_printk(KERN_INFO, sdev, "No events found to cancel\n"); 2644 return 0; 2645 } 2646 2647 sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n"); 2648 2649 list_for_each_entry_safe(evt, temp, &cancelq, cancel) { 2650 wait_for_completion(&evt->comp); 2651 status = be16_to_cpu(evt->queue->cancel_rsp.mad_common.status); 2652 list_del(&evt->cancel); 2653 ibmvfc_free_event(evt); 2654 2655 if (status != IBMVFC_MAD_SUCCESS) { 2656 sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status); 2657 switch (status) { 2658 case IBMVFC_MAD_DRIVER_FAILED: 2659 case IBMVFC_MAD_CRQ_ERROR: 2660 /* Host adapter most likely going through reset, return success to 2661 * the caller will wait for the command being cancelled to get returned 2662 */ 2663 break; 2664 default: 2665 fail = 1; 2666 break; 2667 } 2668 } 2669 } 2670 2671 if (fail) 2672 return -EIO; 2673 2674 sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n"); 2675 LEAVE; 2676 return 0; 2677 } 2678 2679 static int ibmvfc_cancel_all_sq(struct scsi_device *sdev, int type) 2680 { 2681 struct ibmvfc_host *vhost = shost_priv(sdev->host); 2682 struct ibmvfc_event *evt, *found_evt; 2683 union ibmvfc_iu rsp; 2684 int rsp_rc = -EBUSY; 2685 unsigned long flags; 2686 u16 status; 2687 2688 ENTER; 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 cancel\n"); 2703 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2704 return 0; 2705 } 2706 2707 if (vhost->logged_in) { 2708 evt = ibmvfc_init_tmf(&vhost->crq, sdev, type); 2709 evt->sync_iu = &rsp; 2710 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout); 2711 } 2712 2713 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2714 2715 if (rsp_rc != 0) { 2716 sdev_printk(KERN_ERR, sdev, "Failed to send cancel event. rc=%d\n", rsp_rc); 2717 /* If failure is received, the host adapter is most likely going 2718 through reset, return success so the caller will wait for the command 2719 being cancelled to get returned */ 2720 return 0; 2721 } 2722 2723 sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n"); 2724 2725 wait_for_completion(&evt->comp); 2726 status = be16_to_cpu(rsp.mad_common.status); 2727 spin_lock_irqsave(vhost->host->host_lock, flags); 2728 ibmvfc_free_event(evt); 2729 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2730 2731 if (status != IBMVFC_MAD_SUCCESS) { 2732 sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status); 2733 switch (status) { 2734 case IBMVFC_MAD_DRIVER_FAILED: 2735 case IBMVFC_MAD_CRQ_ERROR: 2736 /* Host adapter most likely going through reset, return success to 2737 the caller will wait for the command being cancelled to get returned */ 2738 return 0; 2739 default: 2740 return -EIO; 2741 }; 2742 } 2743 2744 sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n"); 2745 return 0; 2746 } 2747 2748 /** 2749 * ibmvfc_cancel_all - Cancel all outstanding commands to the device 2750 * @sdev: scsi device to cancel commands 2751 * @type: type of error recovery being performed 2752 * 2753 * This sends a cancel to the VIOS for the specified device. This does 2754 * NOT send any abort to the actual device. That must be done separately. 2755 * 2756 * Returns: 2757 * 0 on success / other on failure 2758 **/ 2759 static int ibmvfc_cancel_all(struct scsi_device *sdev, int type) 2760 { 2761 struct ibmvfc_host *vhost = shost_priv(sdev->host); 2762 2763 if (vhost->mq_enabled && vhost->using_channels) 2764 return ibmvfc_cancel_all_mq(sdev, type); 2765 else 2766 return ibmvfc_cancel_all_sq(sdev, type); 2767 } 2768 2769 /** 2770 * ibmvfc_match_key - Match function for specified cancel key 2771 * @evt: ibmvfc event struct 2772 * @key: cancel key to match 2773 * 2774 * Returns: 2775 * 1 if event matches key / 0 if event does not match key 2776 **/ 2777 static int ibmvfc_match_key(struct ibmvfc_event *evt, void *key) 2778 { 2779 unsigned long cancel_key = (unsigned long)key; 2780 2781 if (evt->crq.format == IBMVFC_CMD_FORMAT && 2782 be32_to_cpu(evt->iu.cmd.cancel_key) == cancel_key) 2783 return 1; 2784 return 0; 2785 } 2786 2787 /** 2788 * ibmvfc_match_evt - Match function for specified event 2789 * @evt: ibmvfc event struct 2790 * @match: event to match 2791 * 2792 * Returns: 2793 * 1 if event matches key / 0 if event does not match key 2794 **/ 2795 static int ibmvfc_match_evt(struct ibmvfc_event *evt, void *match) 2796 { 2797 if (evt == match) 2798 return 1; 2799 return 0; 2800 } 2801 2802 /** 2803 * ibmvfc_abort_task_set - Abort outstanding commands to the device 2804 * @sdev: scsi device to abort commands 2805 * 2806 * This sends an Abort Task Set to the VIOS for the specified device. This does 2807 * NOT send any cancel to the VIOS. That must be done separately. 2808 * 2809 * Returns: 2810 * 0 on success / other on failure 2811 **/ 2812 static int ibmvfc_abort_task_set(struct scsi_device *sdev) 2813 { 2814 struct ibmvfc_host *vhost = shost_priv(sdev->host); 2815 struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); 2816 struct ibmvfc_cmd *tmf; 2817 struct ibmvfc_event *evt, *found_evt; 2818 union ibmvfc_iu rsp_iu; 2819 struct ibmvfc_fcp_cmd_iu *iu; 2820 struct ibmvfc_fcp_rsp *fc_rsp = ibmvfc_get_fcp_rsp(vhost, &rsp_iu.cmd); 2821 int rc, rsp_rc = -EBUSY; 2822 unsigned long flags, timeout = IBMVFC_ABORT_TIMEOUT; 2823 int rsp_code = 0; 2824 2825 found_evt = NULL; 2826 spin_lock_irqsave(vhost->host->host_lock, flags); 2827 spin_lock(&vhost->crq.l_lock); 2828 list_for_each_entry(evt, &vhost->crq.sent, queue_list) { 2829 if (evt->cmnd && evt->cmnd->device == sdev) { 2830 found_evt = evt; 2831 break; 2832 } 2833 } 2834 spin_unlock(&vhost->crq.l_lock); 2835 2836 if (!found_evt) { 2837 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL) 2838 sdev_printk(KERN_INFO, sdev, "No events found to abort\n"); 2839 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2840 return 0; 2841 } 2842 2843 if (vhost->state == IBMVFC_ACTIVE) { 2844 evt = ibmvfc_get_event(&vhost->crq); 2845 if (!evt) { 2846 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2847 return -ENOMEM; 2848 } 2849 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT); 2850 tmf = ibmvfc_init_vfc_cmd(evt, sdev); 2851 iu = ibmvfc_get_fcp_iu(vhost, tmf); 2852 2853 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) 2854 tmf->target_wwpn = cpu_to_be64(rport->port_name); 2855 iu->tmf_flags = IBMVFC_ABORT_TASK_SET; 2856 tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF)); 2857 evt->sync_iu = &rsp_iu; 2858 2859 tmf->correlation = cpu_to_be64((u64)evt); 2860 2861 init_completion(&evt->comp); 2862 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout); 2863 } 2864 2865 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2866 2867 if (rsp_rc != 0) { 2868 sdev_printk(KERN_ERR, sdev, "Failed to send abort. rc=%d\n", rsp_rc); 2869 return -EIO; 2870 } 2871 2872 sdev_printk(KERN_INFO, sdev, "Aborting outstanding commands\n"); 2873 timeout = wait_for_completion_timeout(&evt->comp, timeout); 2874 2875 if (!timeout) { 2876 rc = ibmvfc_cancel_all(sdev, 0); 2877 if (!rc) { 2878 rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key); 2879 if (rc == SUCCESS) 2880 rc = 0; 2881 } 2882 2883 if (rc) { 2884 sdev_printk(KERN_INFO, sdev, "Cancel failed, resetting host\n"); 2885 ibmvfc_reset_host(vhost); 2886 rsp_rc = -EIO; 2887 rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key); 2888 2889 if (rc == SUCCESS) 2890 rsp_rc = 0; 2891 2892 rc = ibmvfc_wait_for_ops(vhost, evt, ibmvfc_match_evt); 2893 if (rc != SUCCESS) { 2894 spin_lock_irqsave(vhost->host->host_lock, flags); 2895 ibmvfc_hard_reset_host(vhost); 2896 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2897 rsp_rc = 0; 2898 } 2899 2900 goto out; 2901 } 2902 } 2903 2904 if (rsp_iu.cmd.status) 2905 rsp_code = ibmvfc_get_err_result(vhost, &rsp_iu.cmd); 2906 2907 if (rsp_code) { 2908 if (fc_rsp->flags & FCP_RSP_LEN_VALID) 2909 rsp_code = fc_rsp->data.info.rsp_code; 2910 2911 sdev_printk(KERN_ERR, sdev, "Abort failed: %s (%x:%x) " 2912 "flags: %x fcp_rsp: %x, scsi_status: %x\n", 2913 ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)), 2914 be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error), fc_rsp->flags, rsp_code, 2915 fc_rsp->scsi_status); 2916 rsp_rc = -EIO; 2917 } else 2918 sdev_printk(KERN_INFO, sdev, "Abort successful\n"); 2919 2920 out: 2921 spin_lock_irqsave(vhost->host->host_lock, flags); 2922 ibmvfc_free_event(evt); 2923 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2924 return rsp_rc; 2925 } 2926 2927 /** 2928 * ibmvfc_eh_abort_handler - Abort a command 2929 * @cmd: scsi command to abort 2930 * 2931 * Returns: 2932 * SUCCESS / FAST_IO_FAIL / FAILED 2933 **/ 2934 static int ibmvfc_eh_abort_handler(struct scsi_cmnd *cmd) 2935 { 2936 struct scsi_device *sdev = cmd->device; 2937 struct ibmvfc_host *vhost = shost_priv(sdev->host); 2938 int cancel_rc, block_rc; 2939 int rc = FAILED; 2940 2941 ENTER; 2942 block_rc = fc_block_scsi_eh(cmd); 2943 ibmvfc_wait_while_resetting(vhost); 2944 if (block_rc != FAST_IO_FAIL) { 2945 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET); 2946 ibmvfc_abort_task_set(sdev); 2947 } else 2948 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS); 2949 2950 if (!cancel_rc) 2951 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun); 2952 2953 if (block_rc == FAST_IO_FAIL && rc != FAILED) 2954 rc = FAST_IO_FAIL; 2955 2956 LEAVE; 2957 return rc; 2958 } 2959 2960 /** 2961 * ibmvfc_eh_device_reset_handler - Reset a single LUN 2962 * @cmd: scsi command struct 2963 * 2964 * Returns: 2965 * SUCCESS / FAST_IO_FAIL / FAILED 2966 **/ 2967 static int ibmvfc_eh_device_reset_handler(struct scsi_cmnd *cmd) 2968 { 2969 struct scsi_device *sdev = cmd->device; 2970 struct ibmvfc_host *vhost = shost_priv(sdev->host); 2971 int cancel_rc, block_rc, reset_rc = 0; 2972 int rc = FAILED; 2973 2974 ENTER; 2975 block_rc = fc_block_scsi_eh(cmd); 2976 ibmvfc_wait_while_resetting(vhost); 2977 if (block_rc != FAST_IO_FAIL) { 2978 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_LUN_RESET); 2979 reset_rc = ibmvfc_reset_device(sdev, IBMVFC_LUN_RESET, "LUN"); 2980 } else 2981 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS); 2982 2983 if (!cancel_rc && !reset_rc) 2984 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun); 2985 2986 if (block_rc == FAST_IO_FAIL && rc != FAILED) 2987 rc = FAST_IO_FAIL; 2988 2989 LEAVE; 2990 return rc; 2991 } 2992 2993 /** 2994 * ibmvfc_dev_cancel_all_noreset - Device iterated cancel all function 2995 * @sdev: scsi device struct 2996 * @data: return code 2997 * 2998 **/ 2999 static void ibmvfc_dev_cancel_all_noreset(struct scsi_device *sdev, void *data) 3000 { 3001 unsigned long *rc = data; 3002 *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS); 3003 } 3004 3005 /** 3006 * ibmvfc_eh_target_reset_handler - Reset the target 3007 * @cmd: scsi command struct 3008 * 3009 * Returns: 3010 * SUCCESS / FAST_IO_FAIL / FAILED 3011 **/ 3012 static int ibmvfc_eh_target_reset_handler(struct scsi_cmnd *cmd) 3013 { 3014 struct scsi_target *starget = scsi_target(cmd->device); 3015 struct fc_rport *rport = starget_to_rport(starget); 3016 struct Scsi_Host *shost = rport_to_shost(rport); 3017 struct ibmvfc_host *vhost = shost_priv(shost); 3018 int block_rc; 3019 int reset_rc = 0; 3020 int rc = FAILED; 3021 unsigned long cancel_rc = 0; 3022 bool tgt_reset = false; 3023 3024 ENTER; 3025 block_rc = fc_block_rport(rport); 3026 ibmvfc_wait_while_resetting(vhost); 3027 if (block_rc != FAST_IO_FAIL) { 3028 struct scsi_device *sdev; 3029 3030 shost_for_each_device(sdev, shost) { 3031 if ((sdev->channel != starget->channel) || 3032 (sdev->id != starget->id)) 3033 continue; 3034 3035 cancel_rc |= ibmvfc_cancel_all(sdev, 3036 IBMVFC_TMF_TGT_RESET); 3037 if (!tgt_reset) { 3038 reset_rc = ibmvfc_reset_device(sdev, 3039 IBMVFC_TARGET_RESET, "target"); 3040 tgt_reset = true; 3041 } 3042 } 3043 } else 3044 starget_for_each_device(starget, &cancel_rc, 3045 ibmvfc_dev_cancel_all_noreset); 3046 3047 if (!cancel_rc && !reset_rc) 3048 rc = ibmvfc_wait_for_ops(vhost, starget, ibmvfc_match_target); 3049 3050 if (block_rc == FAST_IO_FAIL && rc != FAILED) 3051 rc = FAST_IO_FAIL; 3052 3053 LEAVE; 3054 return rc; 3055 } 3056 3057 /** 3058 * ibmvfc_eh_host_reset_handler - Reset the connection to the server 3059 * @cmd: struct scsi_cmnd having problems 3060 * 3061 **/ 3062 static int ibmvfc_eh_host_reset_handler(struct scsi_cmnd *cmd) 3063 { 3064 int rc; 3065 struct ibmvfc_host *vhost = shost_priv(cmd->device->host); 3066 3067 dev_err(vhost->dev, "Resetting connection due to error recovery\n"); 3068 rc = ibmvfc_issue_fc_host_lip(vhost->host); 3069 3070 return rc ? FAILED : SUCCESS; 3071 } 3072 3073 /** 3074 * ibmvfc_terminate_rport_io - Terminate all pending I/O to the rport. 3075 * @rport: rport struct 3076 * 3077 * Return value: 3078 * none 3079 **/ 3080 static void ibmvfc_terminate_rport_io(struct fc_rport *rport) 3081 { 3082 struct Scsi_Host *shost = rport_to_shost(rport); 3083 struct ibmvfc_host *vhost = shost_priv(shost); 3084 struct fc_rport *dev_rport; 3085 struct scsi_device *sdev; 3086 struct ibmvfc_target *tgt; 3087 unsigned long rc, flags; 3088 unsigned int found; 3089 3090 ENTER; 3091 shost_for_each_device(sdev, shost) { 3092 dev_rport = starget_to_rport(scsi_target(sdev)); 3093 if (dev_rport != rport) 3094 continue; 3095 ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS); 3096 } 3097 3098 rc = ibmvfc_wait_for_ops(vhost, rport, ibmvfc_match_rport); 3099 3100 if (rc == FAILED) 3101 ibmvfc_issue_fc_host_lip(shost); 3102 3103 spin_lock_irqsave(shost->host_lock, flags); 3104 found = 0; 3105 list_for_each_entry(tgt, &vhost->targets, queue) { 3106 if (tgt->scsi_id == rport->port_id) { 3107 found++; 3108 break; 3109 } 3110 } 3111 3112 if (found && tgt->action == IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT) { 3113 /* 3114 * If we get here, that means we previously attempted to send 3115 * an implicit logout to the target but it failed, most likely 3116 * due to I/O being pending, so we need to send it again 3117 */ 3118 ibmvfc_del_tgt(tgt); 3119 ibmvfc_reinit_host(vhost); 3120 } 3121 3122 spin_unlock_irqrestore(shost->host_lock, flags); 3123 LEAVE; 3124 } 3125 3126 static const struct ibmvfc_async_desc ae_desc [] = { 3127 { "PLOGI", IBMVFC_AE_ELS_PLOGI, IBMVFC_DEFAULT_LOG_LEVEL + 1 }, 3128 { "LOGO", IBMVFC_AE_ELS_LOGO, IBMVFC_DEFAULT_LOG_LEVEL + 1 }, 3129 { "PRLO", IBMVFC_AE_ELS_PRLO, IBMVFC_DEFAULT_LOG_LEVEL + 1 }, 3130 { "N-Port SCN", IBMVFC_AE_SCN_NPORT, IBMVFC_DEFAULT_LOG_LEVEL + 1 }, 3131 { "Group SCN", IBMVFC_AE_SCN_GROUP, IBMVFC_DEFAULT_LOG_LEVEL + 1 }, 3132 { "Domain SCN", IBMVFC_AE_SCN_DOMAIN, IBMVFC_DEFAULT_LOG_LEVEL }, 3133 { "Fabric SCN", IBMVFC_AE_SCN_FABRIC, IBMVFC_DEFAULT_LOG_LEVEL }, 3134 { "Link Up", IBMVFC_AE_LINK_UP, IBMVFC_DEFAULT_LOG_LEVEL }, 3135 { "Link Down", IBMVFC_AE_LINK_DOWN, IBMVFC_DEFAULT_LOG_LEVEL }, 3136 { "Link Dead", IBMVFC_AE_LINK_DEAD, IBMVFC_DEFAULT_LOG_LEVEL }, 3137 { "Halt", IBMVFC_AE_HALT, IBMVFC_DEFAULT_LOG_LEVEL }, 3138 { "Resume", IBMVFC_AE_RESUME, IBMVFC_DEFAULT_LOG_LEVEL }, 3139 { "Adapter Failed", IBMVFC_AE_ADAPTER_FAILED, IBMVFC_DEFAULT_LOG_LEVEL }, 3140 }; 3141 3142 static const struct ibmvfc_async_desc unknown_ae = { 3143 "Unknown async", 0, IBMVFC_DEFAULT_LOG_LEVEL 3144 }; 3145 3146 /** 3147 * ibmvfc_get_ae_desc - Get text description for async event 3148 * @ae: async event 3149 * 3150 **/ 3151 static const struct ibmvfc_async_desc *ibmvfc_get_ae_desc(u64 ae) 3152 { 3153 int i; 3154 3155 for (i = 0; i < ARRAY_SIZE(ae_desc); i++) 3156 if (ae_desc[i].ae == ae) 3157 return &ae_desc[i]; 3158 3159 return &unknown_ae; 3160 } 3161 3162 static const struct { 3163 enum ibmvfc_ae_link_state state; 3164 const char *desc; 3165 } link_desc [] = { 3166 { IBMVFC_AE_LS_LINK_UP, " link up" }, 3167 { IBMVFC_AE_LS_LINK_BOUNCED, " link bounced" }, 3168 { IBMVFC_AE_LS_LINK_DOWN, " link down" }, 3169 { IBMVFC_AE_LS_LINK_DEAD, " link dead" }, 3170 }; 3171 3172 /** 3173 * ibmvfc_get_link_state - Get text description for link state 3174 * @state: link state 3175 * 3176 **/ 3177 static const char *ibmvfc_get_link_state(enum ibmvfc_ae_link_state state) 3178 { 3179 int i; 3180 3181 for (i = 0; i < ARRAY_SIZE(link_desc); i++) 3182 if (link_desc[i].state == state) 3183 return link_desc[i].desc; 3184 3185 return ""; 3186 } 3187 3188 /** 3189 * ibmvfc_handle_async - Handle an async event from the adapter 3190 * @crq: crq to process 3191 * @vhost: ibmvfc host struct 3192 * 3193 **/ 3194 static void ibmvfc_handle_async(struct ibmvfc_async_crq *crq, 3195 struct ibmvfc_host *vhost) 3196 { 3197 const struct ibmvfc_async_desc *desc = ibmvfc_get_ae_desc(be64_to_cpu(crq->event)); 3198 struct ibmvfc_target *tgt; 3199 3200 ibmvfc_log(vhost, desc->log_level, "%s event received. scsi_id: %llx, wwpn: %llx," 3201 " node_name: %llx%s\n", desc->desc, be64_to_cpu(crq->scsi_id), 3202 be64_to_cpu(crq->wwpn), be64_to_cpu(crq->node_name), 3203 ibmvfc_get_link_state(crq->link_state)); 3204 3205 switch (be64_to_cpu(crq->event)) { 3206 case IBMVFC_AE_RESUME: 3207 switch (crq->link_state) { 3208 case IBMVFC_AE_LS_LINK_DOWN: 3209 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN); 3210 break; 3211 case IBMVFC_AE_LS_LINK_DEAD: 3212 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 3213 break; 3214 case IBMVFC_AE_LS_LINK_UP: 3215 case IBMVFC_AE_LS_LINK_BOUNCED: 3216 default: 3217 vhost->events_to_log |= IBMVFC_AE_LINKUP; 3218 vhost->delay_init = 1; 3219 __ibmvfc_reset_host(vhost); 3220 break; 3221 } 3222 3223 break; 3224 case IBMVFC_AE_LINK_UP: 3225 vhost->events_to_log |= IBMVFC_AE_LINKUP; 3226 vhost->delay_init = 1; 3227 __ibmvfc_reset_host(vhost); 3228 break; 3229 case IBMVFC_AE_SCN_FABRIC: 3230 case IBMVFC_AE_SCN_DOMAIN: 3231 vhost->events_to_log |= IBMVFC_AE_RSCN; 3232 if (vhost->state < IBMVFC_HALTED) { 3233 vhost->delay_init = 1; 3234 __ibmvfc_reset_host(vhost); 3235 } 3236 break; 3237 case IBMVFC_AE_SCN_NPORT: 3238 case IBMVFC_AE_SCN_GROUP: 3239 vhost->events_to_log |= IBMVFC_AE_RSCN; 3240 ibmvfc_reinit_host(vhost); 3241 break; 3242 case IBMVFC_AE_ELS_LOGO: 3243 case IBMVFC_AE_ELS_PRLO: 3244 case IBMVFC_AE_ELS_PLOGI: 3245 list_for_each_entry(tgt, &vhost->targets, queue) { 3246 if (!crq->scsi_id && !crq->wwpn && !crq->node_name) 3247 break; 3248 if (crq->scsi_id && cpu_to_be64(tgt->scsi_id) != crq->scsi_id) 3249 continue; 3250 if (crq->wwpn && cpu_to_be64(tgt->ids.port_name) != crq->wwpn) 3251 continue; 3252 if (crq->node_name && cpu_to_be64(tgt->ids.node_name) != crq->node_name) 3253 continue; 3254 if (tgt->need_login && be64_to_cpu(crq->event) == IBMVFC_AE_ELS_LOGO) 3255 tgt->logo_rcvd = 1; 3256 if (!tgt->need_login || be64_to_cpu(crq->event) == IBMVFC_AE_ELS_PLOGI) { 3257 ibmvfc_del_tgt(tgt); 3258 ibmvfc_reinit_host(vhost); 3259 } 3260 } 3261 break; 3262 case IBMVFC_AE_LINK_DOWN: 3263 case IBMVFC_AE_ADAPTER_FAILED: 3264 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN); 3265 break; 3266 case IBMVFC_AE_LINK_DEAD: 3267 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 3268 break; 3269 case IBMVFC_AE_HALT: 3270 ibmvfc_link_down(vhost, IBMVFC_HALTED); 3271 break; 3272 default: 3273 dev_err(vhost->dev, "Unknown async event received: %lld\n", crq->event); 3274 break; 3275 } 3276 } 3277 3278 /** 3279 * ibmvfc_handle_crq - Handles and frees received events in the CRQ 3280 * @crq: Command/Response queue 3281 * @vhost: ibmvfc host struct 3282 * @evt_doneq: Event done queue 3283 * 3284 **/ 3285 static void ibmvfc_handle_crq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost, 3286 struct list_head *evt_doneq) 3287 { 3288 long rc; 3289 struct ibmvfc_event *evt = (struct ibmvfc_event *)be64_to_cpu(crq->ioba); 3290 3291 switch (crq->valid) { 3292 case IBMVFC_CRQ_INIT_RSP: 3293 switch (crq->format) { 3294 case IBMVFC_CRQ_INIT: 3295 dev_info(vhost->dev, "Partner initialized\n"); 3296 /* Send back a response */ 3297 rc = ibmvfc_send_crq_init_complete(vhost); 3298 if (rc == 0) 3299 ibmvfc_init_host(vhost); 3300 else 3301 dev_err(vhost->dev, "Unable to send init rsp. rc=%ld\n", rc); 3302 break; 3303 case IBMVFC_CRQ_INIT_COMPLETE: 3304 dev_info(vhost->dev, "Partner initialization complete\n"); 3305 ibmvfc_init_host(vhost); 3306 break; 3307 default: 3308 dev_err(vhost->dev, "Unknown crq message type: %d\n", crq->format); 3309 } 3310 return; 3311 case IBMVFC_CRQ_XPORT_EVENT: 3312 vhost->state = IBMVFC_NO_CRQ; 3313 vhost->logged_in = 0; 3314 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE); 3315 if (crq->format == IBMVFC_PARTITION_MIGRATED) { 3316 /* We need to re-setup the interpartition connection */ 3317 dev_info(vhost->dev, "Partition migrated, Re-enabling adapter\n"); 3318 vhost->client_migrated = 1; 3319 3320 scsi_block_requests(vhost->host); 3321 ibmvfc_purge_requests(vhost, DID_REQUEUE); 3322 ibmvfc_set_host_state(vhost, IBMVFC_LINK_DOWN); 3323 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_REENABLE); 3324 wake_up(&vhost->work_wait_q); 3325 } else if (crq->format == IBMVFC_PARTNER_FAILED || crq->format == IBMVFC_PARTNER_DEREGISTER) { 3326 dev_err(vhost->dev, "Host partner adapter deregistered or failed (rc=%d)\n", crq->format); 3327 ibmvfc_purge_requests(vhost, DID_ERROR); 3328 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN); 3329 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET); 3330 } else { 3331 dev_err(vhost->dev, "Received unknown transport event from partner (rc=%d)\n", crq->format); 3332 } 3333 return; 3334 case IBMVFC_CRQ_CMD_RSP: 3335 break; 3336 default: 3337 dev_err(vhost->dev, "Got an invalid message type 0x%02x\n", crq->valid); 3338 return; 3339 } 3340 3341 if (crq->format == IBMVFC_ASYNC_EVENT) 3342 return; 3343 3344 /* The only kind of payload CRQs we should get are responses to 3345 * things we send. Make sure this response is to something we 3346 * actually sent 3347 */ 3348 if (unlikely(!ibmvfc_valid_event(&vhost->crq.evt_pool, evt))) { 3349 dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n", 3350 crq->ioba); 3351 return; 3352 } 3353 3354 if (unlikely(atomic_dec_if_positive(&evt->active))) { 3355 dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n", 3356 crq->ioba); 3357 return; 3358 } 3359 3360 spin_lock(&evt->queue->l_lock); 3361 list_move_tail(&evt->queue_list, evt_doneq); 3362 spin_unlock(&evt->queue->l_lock); 3363 } 3364 3365 /** 3366 * ibmvfc_scan_finished - Check if the device scan is done. 3367 * @shost: scsi host struct 3368 * @time: current elapsed time 3369 * 3370 * Returns: 3371 * 0 if scan is not done / 1 if scan is done 3372 **/ 3373 static int ibmvfc_scan_finished(struct Scsi_Host *shost, unsigned long time) 3374 { 3375 unsigned long flags; 3376 struct ibmvfc_host *vhost = shost_priv(shost); 3377 int done = 0; 3378 3379 spin_lock_irqsave(shost->host_lock, flags); 3380 if (!vhost->scan_timeout) 3381 done = 1; 3382 else if (time >= (vhost->scan_timeout * HZ)) { 3383 dev_info(vhost->dev, "Scan taking longer than %d seconds, " 3384 "continuing initialization\n", vhost->scan_timeout); 3385 done = 1; 3386 } 3387 3388 if (vhost->scan_complete) { 3389 vhost->scan_timeout = init_timeout; 3390 done = 1; 3391 } 3392 spin_unlock_irqrestore(shost->host_lock, flags); 3393 return done; 3394 } 3395 3396 /** 3397 * ibmvfc_sdev_init - Setup the device's task set value 3398 * @sdev: struct scsi_device device to configure 3399 * 3400 * Set the device's task set value so that error handling works as 3401 * expected. 3402 * 3403 * Returns: 3404 * 0 on success / -ENXIO if device does not exist 3405 **/ 3406 static int ibmvfc_sdev_init(struct scsi_device *sdev) 3407 { 3408 struct Scsi_Host *shost = sdev->host; 3409 struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); 3410 struct ibmvfc_host *vhost = shost_priv(shost); 3411 unsigned long flags = 0; 3412 3413 if (!rport || fc_remote_port_chkready(rport)) 3414 return -ENXIO; 3415 3416 spin_lock_irqsave(shost->host_lock, flags); 3417 sdev->hostdata = (void *)(unsigned long)vhost->task_set++; 3418 spin_unlock_irqrestore(shost->host_lock, flags); 3419 return 0; 3420 } 3421 3422 /** 3423 * ibmvfc_target_alloc - Setup the target's task set value 3424 * @starget: struct scsi_target 3425 * 3426 * Set the target's task set value so that error handling works as 3427 * expected. 3428 * 3429 * Returns: 3430 * 0 on success / -ENXIO if device does not exist 3431 **/ 3432 static int ibmvfc_target_alloc(struct scsi_target *starget) 3433 { 3434 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 3435 struct ibmvfc_host *vhost = shost_priv(shost); 3436 unsigned long flags = 0; 3437 3438 spin_lock_irqsave(shost->host_lock, flags); 3439 starget->hostdata = (void *)(unsigned long)vhost->task_set++; 3440 spin_unlock_irqrestore(shost->host_lock, flags); 3441 return 0; 3442 } 3443 3444 /** 3445 * ibmvfc_sdev_configure - Configure the device 3446 * @sdev: struct scsi_device device to configure 3447 * @lim: Request queue limits 3448 * 3449 * Enable allow_restart for a device if it is a disk. Adjust the 3450 * queue_depth here also. 3451 * 3452 * Returns: 3453 * 0 3454 **/ 3455 static int ibmvfc_sdev_configure(struct scsi_device *sdev, 3456 struct queue_limits *lim) 3457 { 3458 struct Scsi_Host *shost = sdev->host; 3459 unsigned long flags = 0; 3460 3461 spin_lock_irqsave(shost->host_lock, flags); 3462 if (sdev->type == TYPE_DISK) { 3463 sdev->allow_restart = 1; 3464 blk_queue_rq_timeout(sdev->request_queue, 120 * HZ); 3465 } 3466 spin_unlock_irqrestore(shost->host_lock, flags); 3467 return 0; 3468 } 3469 3470 /** 3471 * ibmvfc_change_queue_depth - Change the device's queue depth 3472 * @sdev: scsi device struct 3473 * @qdepth: depth to set 3474 * 3475 * Return value: 3476 * actual depth set 3477 **/ 3478 static int ibmvfc_change_queue_depth(struct scsi_device *sdev, int qdepth) 3479 { 3480 if (qdepth > IBMVFC_MAX_CMDS_PER_LUN) 3481 qdepth = IBMVFC_MAX_CMDS_PER_LUN; 3482 3483 return scsi_change_queue_depth(sdev, qdepth); 3484 } 3485 3486 static ssize_t ibmvfc_show_host_partition_name(struct device *dev, 3487 struct device_attribute *attr, char *buf) 3488 { 3489 struct Scsi_Host *shost = class_to_shost(dev); 3490 struct ibmvfc_host *vhost = shost_priv(shost); 3491 3492 return sysfs_emit(buf, "%s\n", vhost->login_buf->resp.partition_name); 3493 } 3494 3495 static ssize_t ibmvfc_show_host_device_name(struct device *dev, 3496 struct device_attribute *attr, char *buf) 3497 { 3498 struct Scsi_Host *shost = class_to_shost(dev); 3499 struct ibmvfc_host *vhost = shost_priv(shost); 3500 3501 return sysfs_emit(buf, "%s\n", vhost->login_buf->resp.device_name); 3502 } 3503 3504 static ssize_t ibmvfc_show_host_loc_code(struct device *dev, 3505 struct device_attribute *attr, char *buf) 3506 { 3507 struct Scsi_Host *shost = class_to_shost(dev); 3508 struct ibmvfc_host *vhost = shost_priv(shost); 3509 3510 return sysfs_emit(buf, "%s\n", vhost->login_buf->resp.port_loc_code); 3511 } 3512 3513 static ssize_t ibmvfc_show_host_drc_name(struct device *dev, 3514 struct device_attribute *attr, char *buf) 3515 { 3516 struct Scsi_Host *shost = class_to_shost(dev); 3517 struct ibmvfc_host *vhost = shost_priv(shost); 3518 3519 return sysfs_emit(buf, "%s\n", vhost->login_buf->resp.drc_name); 3520 } 3521 3522 static ssize_t ibmvfc_show_host_npiv_version(struct device *dev, 3523 struct device_attribute *attr, char *buf) 3524 { 3525 struct Scsi_Host *shost = class_to_shost(dev); 3526 struct ibmvfc_host *vhost = shost_priv(shost); 3527 return sysfs_emit(buf, "%d\n", 3528 be32_to_cpu(vhost->login_buf->resp.version)); 3529 } 3530 3531 static ssize_t ibmvfc_show_host_capabilities(struct device *dev, 3532 struct device_attribute *attr, char *buf) 3533 { 3534 struct Scsi_Host *shost = class_to_shost(dev); 3535 struct ibmvfc_host *vhost = shost_priv(shost); 3536 return sysfs_emit(buf, "%llx\n", 3537 be64_to_cpu(vhost->login_buf->resp.capabilities)); 3538 } 3539 3540 /** 3541 * ibmvfc_show_log_level - Show the adapter's error logging level 3542 * @dev: class device struct 3543 * @attr: unused 3544 * @buf: buffer 3545 * 3546 * Return value: 3547 * number of bytes printed to buffer 3548 **/ 3549 static ssize_t ibmvfc_show_log_level(struct device *dev, 3550 struct device_attribute *attr, char *buf) 3551 { 3552 struct Scsi_Host *shost = class_to_shost(dev); 3553 struct ibmvfc_host *vhost = shost_priv(shost); 3554 unsigned long flags = 0; 3555 int len; 3556 3557 spin_lock_irqsave(shost->host_lock, flags); 3558 len = sysfs_emit(buf, "%d\n", vhost->log_level); 3559 spin_unlock_irqrestore(shost->host_lock, flags); 3560 return len; 3561 } 3562 3563 /** 3564 * ibmvfc_store_log_level - Change the adapter's error logging level 3565 * @dev: class device struct 3566 * @attr: unused 3567 * @buf: buffer 3568 * @count: buffer size 3569 * 3570 * Return value: 3571 * number of bytes printed to buffer 3572 **/ 3573 static ssize_t ibmvfc_store_log_level(struct device *dev, 3574 struct device_attribute *attr, 3575 const char *buf, size_t count) 3576 { 3577 struct Scsi_Host *shost = class_to_shost(dev); 3578 struct ibmvfc_host *vhost = shost_priv(shost); 3579 unsigned long flags = 0; 3580 3581 spin_lock_irqsave(shost->host_lock, flags); 3582 vhost->log_level = simple_strtoul(buf, NULL, 10); 3583 spin_unlock_irqrestore(shost->host_lock, flags); 3584 return strlen(buf); 3585 } 3586 3587 static ssize_t ibmvfc_show_scsi_channels(struct device *dev, 3588 struct device_attribute *attr, char *buf) 3589 { 3590 struct Scsi_Host *shost = class_to_shost(dev); 3591 struct ibmvfc_host *vhost = shost_priv(shost); 3592 struct ibmvfc_channels *scsi = &vhost->scsi_scrqs; 3593 unsigned long flags = 0; 3594 int len; 3595 3596 spin_lock_irqsave(shost->host_lock, flags); 3597 len = sysfs_emit(buf, "%d\n", scsi->desired_queues); 3598 spin_unlock_irqrestore(shost->host_lock, flags); 3599 return len; 3600 } 3601 3602 static ssize_t ibmvfc_store_scsi_channels(struct device *dev, 3603 struct device_attribute *attr, 3604 const char *buf, size_t count) 3605 { 3606 struct Scsi_Host *shost = class_to_shost(dev); 3607 struct ibmvfc_host *vhost = shost_priv(shost); 3608 struct ibmvfc_channels *scsi = &vhost->scsi_scrqs; 3609 unsigned long flags = 0; 3610 unsigned int channels; 3611 3612 spin_lock_irqsave(shost->host_lock, flags); 3613 channels = simple_strtoul(buf, NULL, 10); 3614 scsi->desired_queues = min(channels, shost->nr_hw_queues); 3615 ibmvfc_hard_reset_host(vhost); 3616 spin_unlock_irqrestore(shost->host_lock, flags); 3617 return strlen(buf); 3618 } 3619 3620 static DEVICE_ATTR(partition_name, S_IRUGO, ibmvfc_show_host_partition_name, NULL); 3621 static DEVICE_ATTR(device_name, S_IRUGO, ibmvfc_show_host_device_name, NULL); 3622 static DEVICE_ATTR(port_loc_code, S_IRUGO, ibmvfc_show_host_loc_code, NULL); 3623 static DEVICE_ATTR(drc_name, S_IRUGO, ibmvfc_show_host_drc_name, NULL); 3624 static DEVICE_ATTR(npiv_version, S_IRUGO, ibmvfc_show_host_npiv_version, NULL); 3625 static DEVICE_ATTR(capabilities, S_IRUGO, ibmvfc_show_host_capabilities, NULL); 3626 static DEVICE_ATTR(log_level, S_IRUGO | S_IWUSR, 3627 ibmvfc_show_log_level, ibmvfc_store_log_level); 3628 static DEVICE_ATTR(nr_scsi_channels, S_IRUGO | S_IWUSR, 3629 ibmvfc_show_scsi_channels, ibmvfc_store_scsi_channels); 3630 3631 #ifdef CONFIG_SCSI_IBMVFC_TRACE 3632 /** 3633 * ibmvfc_read_trace - Dump the adapter trace 3634 * @filp: open sysfs file 3635 * @kobj: kobject struct 3636 * @bin_attr: bin_attribute struct 3637 * @buf: buffer 3638 * @off: offset 3639 * @count: buffer size 3640 * 3641 * Return value: 3642 * number of bytes printed to buffer 3643 **/ 3644 static ssize_t ibmvfc_read_trace(struct file *filp, struct kobject *kobj, 3645 const struct bin_attribute *bin_attr, 3646 char *buf, loff_t off, size_t count) 3647 { 3648 struct device *dev = kobj_to_dev(kobj); 3649 struct Scsi_Host *shost = class_to_shost(dev); 3650 struct ibmvfc_host *vhost = shost_priv(shost); 3651 unsigned long flags = 0; 3652 int size = IBMVFC_TRACE_SIZE; 3653 char *src = (char *)vhost->trace; 3654 3655 if (off > size) 3656 return 0; 3657 if (off + count > size) { 3658 size -= off; 3659 count = size; 3660 } 3661 3662 spin_lock_irqsave(shost->host_lock, flags); 3663 memcpy(buf, &src[off], count); 3664 spin_unlock_irqrestore(shost->host_lock, flags); 3665 return count; 3666 } 3667 3668 static const struct bin_attribute ibmvfc_trace_attr = { 3669 .attr = { 3670 .name = "trace", 3671 .mode = S_IRUGO, 3672 }, 3673 .size = 0, 3674 .read = ibmvfc_read_trace, 3675 }; 3676 #endif 3677 3678 static struct attribute *ibmvfc_host_attrs[] = { 3679 &dev_attr_partition_name.attr, 3680 &dev_attr_device_name.attr, 3681 &dev_attr_port_loc_code.attr, 3682 &dev_attr_drc_name.attr, 3683 &dev_attr_npiv_version.attr, 3684 &dev_attr_capabilities.attr, 3685 &dev_attr_log_level.attr, 3686 &dev_attr_nr_scsi_channels.attr, 3687 NULL 3688 }; 3689 3690 ATTRIBUTE_GROUPS(ibmvfc_host); 3691 3692 static const struct scsi_host_template driver_template = { 3693 .module = THIS_MODULE, 3694 .name = "IBM POWER Virtual FC Adapter", 3695 .proc_name = IBMVFC_NAME, 3696 .queuecommand = ibmvfc_queuecommand, 3697 .eh_timed_out = fc_eh_timed_out, 3698 .eh_abort_handler = ibmvfc_eh_abort_handler, 3699 .eh_device_reset_handler = ibmvfc_eh_device_reset_handler, 3700 .eh_target_reset_handler = ibmvfc_eh_target_reset_handler, 3701 .eh_host_reset_handler = ibmvfc_eh_host_reset_handler, 3702 .sdev_init = ibmvfc_sdev_init, 3703 .sdev_configure = ibmvfc_sdev_configure, 3704 .target_alloc = ibmvfc_target_alloc, 3705 .scan_finished = ibmvfc_scan_finished, 3706 .change_queue_depth = ibmvfc_change_queue_depth, 3707 .cmd_per_lun = 16, 3708 .can_queue = IBMVFC_MAX_REQUESTS_DEFAULT, 3709 .this_id = -1, 3710 .sg_tablesize = SG_ALL, 3711 .max_sectors = IBMVFC_MAX_SECTORS, 3712 .shost_groups = ibmvfc_host_groups, 3713 .track_queue_depth = 1, 3714 }; 3715 3716 /** 3717 * ibmvfc_next_async_crq - Returns the next entry in async queue 3718 * @vhost: ibmvfc host struct 3719 * 3720 * Returns: 3721 * Pointer to next entry in queue / NULL if empty 3722 **/ 3723 static struct ibmvfc_async_crq *ibmvfc_next_async_crq(struct ibmvfc_host *vhost) 3724 { 3725 struct ibmvfc_queue *async_crq = &vhost->async_crq; 3726 struct ibmvfc_async_crq *crq; 3727 3728 crq = &async_crq->msgs.async[async_crq->cur]; 3729 if (crq->valid & 0x80) { 3730 if (++async_crq->cur == async_crq->size) 3731 async_crq->cur = 0; 3732 rmb(); 3733 } else 3734 crq = NULL; 3735 3736 return crq; 3737 } 3738 3739 /** 3740 * ibmvfc_next_crq - Returns the next entry in message queue 3741 * @vhost: ibmvfc host struct 3742 * 3743 * Returns: 3744 * Pointer to next entry in queue / NULL if empty 3745 **/ 3746 static struct ibmvfc_crq *ibmvfc_next_crq(struct ibmvfc_host *vhost) 3747 { 3748 struct ibmvfc_queue *queue = &vhost->crq; 3749 struct ibmvfc_crq *crq; 3750 3751 crq = &queue->msgs.crq[queue->cur]; 3752 if (crq->valid & 0x80) { 3753 if (++queue->cur == queue->size) 3754 queue->cur = 0; 3755 rmb(); 3756 } else 3757 crq = NULL; 3758 3759 return crq; 3760 } 3761 3762 /** 3763 * ibmvfc_interrupt - Interrupt handler 3764 * @irq: number of irq to handle, not used 3765 * @dev_instance: ibmvfc_host that received interrupt 3766 * 3767 * Returns: 3768 * IRQ_HANDLED 3769 **/ 3770 static irqreturn_t ibmvfc_interrupt(int irq, void *dev_instance) 3771 { 3772 struct ibmvfc_host *vhost = (struct ibmvfc_host *)dev_instance; 3773 unsigned long flags; 3774 3775 spin_lock_irqsave(vhost->host->host_lock, flags); 3776 vio_disable_interrupts(to_vio_dev(vhost->dev)); 3777 tasklet_schedule(&vhost->tasklet); 3778 spin_unlock_irqrestore(vhost->host->host_lock, flags); 3779 return IRQ_HANDLED; 3780 } 3781 3782 /** 3783 * ibmvfc_tasklet - Interrupt handler tasklet 3784 * @data: ibmvfc host struct 3785 * 3786 * Returns: 3787 * Nothing 3788 **/ 3789 static void ibmvfc_tasklet(void *data) 3790 { 3791 struct ibmvfc_host *vhost = data; 3792 struct vio_dev *vdev = to_vio_dev(vhost->dev); 3793 struct ibmvfc_crq *crq; 3794 struct ibmvfc_async_crq *async; 3795 struct ibmvfc_event *evt, *temp; 3796 unsigned long flags; 3797 int done = 0; 3798 LIST_HEAD(evt_doneq); 3799 3800 spin_lock_irqsave(vhost->host->host_lock, flags); 3801 spin_lock(vhost->crq.q_lock); 3802 while (!done) { 3803 /* Pull all the valid messages off the async CRQ */ 3804 while ((async = ibmvfc_next_async_crq(vhost)) != NULL) { 3805 ibmvfc_handle_async(async, vhost); 3806 async->valid = 0; 3807 wmb(); 3808 } 3809 3810 /* Pull all the valid messages off the CRQ */ 3811 while ((crq = ibmvfc_next_crq(vhost)) != NULL) { 3812 ibmvfc_handle_crq(crq, vhost, &evt_doneq); 3813 crq->valid = 0; 3814 wmb(); 3815 } 3816 3817 vio_enable_interrupts(vdev); 3818 if ((async = ibmvfc_next_async_crq(vhost)) != NULL) { 3819 vio_disable_interrupts(vdev); 3820 ibmvfc_handle_async(async, vhost); 3821 async->valid = 0; 3822 wmb(); 3823 } else if ((crq = ibmvfc_next_crq(vhost)) != NULL) { 3824 vio_disable_interrupts(vdev); 3825 ibmvfc_handle_crq(crq, vhost, &evt_doneq); 3826 crq->valid = 0; 3827 wmb(); 3828 } else 3829 done = 1; 3830 } 3831 3832 spin_unlock(vhost->crq.q_lock); 3833 spin_unlock_irqrestore(vhost->host->host_lock, flags); 3834 3835 list_for_each_entry_safe(evt, temp, &evt_doneq, queue_list) { 3836 timer_delete(&evt->timer); 3837 list_del(&evt->queue_list); 3838 ibmvfc_trc_end(evt); 3839 evt->done(evt); 3840 } 3841 } 3842 3843 static int ibmvfc_toggle_scrq_irq(struct ibmvfc_queue *scrq, int enable) 3844 { 3845 struct device *dev = scrq->vhost->dev; 3846 struct vio_dev *vdev = to_vio_dev(dev); 3847 unsigned long rc; 3848 int irq_action = H_ENABLE_VIO_INTERRUPT; 3849 3850 if (!enable) 3851 irq_action = H_DISABLE_VIO_INTERRUPT; 3852 3853 rc = plpar_hcall_norets(H_VIOCTL, vdev->unit_address, irq_action, 3854 scrq->hw_irq, 0, 0); 3855 3856 if (rc) 3857 dev_err(dev, "Couldn't %s sub-crq[%lu] irq. rc=%ld\n", 3858 enable ? "enable" : "disable", scrq->hwq_id, rc); 3859 3860 return rc; 3861 } 3862 3863 static void ibmvfc_handle_scrq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost, 3864 struct list_head *evt_doneq) 3865 { 3866 struct ibmvfc_event *evt = (struct ibmvfc_event *)be64_to_cpu(crq->ioba); 3867 3868 switch (crq->valid) { 3869 case IBMVFC_CRQ_CMD_RSP: 3870 break; 3871 case IBMVFC_CRQ_XPORT_EVENT: 3872 return; 3873 default: 3874 dev_err(vhost->dev, "Got and invalid message type 0x%02x\n", crq->valid); 3875 return; 3876 } 3877 3878 /* The only kind of payload CRQs we should get are responses to 3879 * things we send. Make sure this response is to something we 3880 * actually sent 3881 */ 3882 if (unlikely(!ibmvfc_valid_event(&evt->queue->evt_pool, evt))) { 3883 dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n", 3884 crq->ioba); 3885 return; 3886 } 3887 3888 if (unlikely(atomic_dec_if_positive(&evt->active))) { 3889 dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n", 3890 crq->ioba); 3891 return; 3892 } 3893 3894 spin_lock(&evt->queue->l_lock); 3895 list_move_tail(&evt->queue_list, evt_doneq); 3896 spin_unlock(&evt->queue->l_lock); 3897 } 3898 3899 static struct ibmvfc_crq *ibmvfc_next_scrq(struct ibmvfc_queue *scrq) 3900 { 3901 struct ibmvfc_crq *crq; 3902 3903 crq = &scrq->msgs.scrq[scrq->cur].crq; 3904 if (crq->valid & 0x80) { 3905 if (++scrq->cur == scrq->size) 3906 scrq->cur = 0; 3907 rmb(); 3908 } else 3909 crq = NULL; 3910 3911 return crq; 3912 } 3913 3914 static void ibmvfc_drain_sub_crq(struct ibmvfc_queue *scrq) 3915 { 3916 struct ibmvfc_crq *crq; 3917 struct ibmvfc_event *evt, *temp; 3918 unsigned long flags; 3919 int done = 0; 3920 LIST_HEAD(evt_doneq); 3921 3922 spin_lock_irqsave(scrq->q_lock, flags); 3923 while (!done) { 3924 while ((crq = ibmvfc_next_scrq(scrq)) != NULL) { 3925 ibmvfc_handle_scrq(crq, scrq->vhost, &evt_doneq); 3926 crq->valid = 0; 3927 wmb(); 3928 } 3929 3930 ibmvfc_toggle_scrq_irq(scrq, 1); 3931 if ((crq = ibmvfc_next_scrq(scrq)) != NULL) { 3932 ibmvfc_toggle_scrq_irq(scrq, 0); 3933 ibmvfc_handle_scrq(crq, scrq->vhost, &evt_doneq); 3934 crq->valid = 0; 3935 wmb(); 3936 } else 3937 done = 1; 3938 } 3939 spin_unlock_irqrestore(scrq->q_lock, flags); 3940 3941 list_for_each_entry_safe(evt, temp, &evt_doneq, queue_list) { 3942 timer_delete(&evt->timer); 3943 list_del(&evt->queue_list); 3944 ibmvfc_trc_end(evt); 3945 evt->done(evt); 3946 } 3947 } 3948 3949 static irqreturn_t ibmvfc_interrupt_mq(int irq, void *scrq_instance) 3950 { 3951 struct ibmvfc_queue *scrq = (struct ibmvfc_queue *)scrq_instance; 3952 3953 ibmvfc_toggle_scrq_irq(scrq, 0); 3954 ibmvfc_drain_sub_crq(scrq); 3955 3956 return IRQ_HANDLED; 3957 } 3958 3959 /** 3960 * ibmvfc_init_tgt - Set the next init job step for the target 3961 * @tgt: ibmvfc target struct 3962 * @job_step: job step to perform 3963 * 3964 **/ 3965 static void ibmvfc_init_tgt(struct ibmvfc_target *tgt, 3966 void (*job_step) (struct ibmvfc_target *)) 3967 { 3968 if (!ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT)) 3969 tgt->job_step = job_step; 3970 wake_up(&tgt->vhost->work_wait_q); 3971 } 3972 3973 /** 3974 * ibmvfc_retry_tgt_init - Attempt to retry a step in target initialization 3975 * @tgt: ibmvfc target struct 3976 * @job_step: initialization job step 3977 * 3978 * Returns: 1 if step will be retried / 0 if not 3979 * 3980 **/ 3981 static int ibmvfc_retry_tgt_init(struct ibmvfc_target *tgt, 3982 void (*job_step) (struct ibmvfc_target *)) 3983 { 3984 if (++tgt->init_retries > IBMVFC_MAX_TGT_INIT_RETRIES) { 3985 ibmvfc_del_tgt(tgt); 3986 wake_up(&tgt->vhost->work_wait_q); 3987 return 0; 3988 } else 3989 ibmvfc_init_tgt(tgt, job_step); 3990 return 1; 3991 } 3992 3993 /* Defined in FC-LS */ 3994 static const struct { 3995 int code; 3996 int retry; 3997 int logged_in; 3998 } prli_rsp [] = { 3999 { 0, 1, 0 }, 4000 { 1, 0, 1 }, 4001 { 2, 1, 0 }, 4002 { 3, 1, 0 }, 4003 { 4, 0, 0 }, 4004 { 5, 0, 0 }, 4005 { 6, 0, 1 }, 4006 { 7, 0, 0 }, 4007 { 8, 1, 0 }, 4008 }; 4009 4010 /** 4011 * ibmvfc_get_prli_rsp - Find PRLI response index 4012 * @flags: PRLI response flags 4013 * 4014 **/ 4015 static int ibmvfc_get_prli_rsp(u16 flags) 4016 { 4017 int i; 4018 int code = (flags & 0x0f00) >> 8; 4019 4020 for (i = 0; i < ARRAY_SIZE(prli_rsp); i++) 4021 if (prli_rsp[i].code == code) 4022 return i; 4023 4024 return 0; 4025 } 4026 4027 /** 4028 * ibmvfc_tgt_prli_done - Completion handler for Process Login 4029 * @evt: ibmvfc event struct 4030 * 4031 **/ 4032 static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt) 4033 { 4034 struct ibmvfc_target *tgt = evt->tgt; 4035 struct ibmvfc_host *vhost = evt->vhost; 4036 struct ibmvfc_process_login *rsp = &evt->xfer_iu->prli; 4037 struct ibmvfc_prli_svc_parms *parms = &rsp->parms; 4038 u32 status = be16_to_cpu(rsp->common.status); 4039 int index, level = IBMVFC_DEFAULT_LOG_LEVEL; 4040 4041 vhost->discovery_threads--; 4042 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4043 switch (status) { 4044 case IBMVFC_MAD_SUCCESS: 4045 tgt_dbg(tgt, "Process Login succeeded: %X %02X %04X\n", 4046 parms->type, parms->flags, parms->service_parms); 4047 4048 if (parms->type == IBMVFC_SCSI_FCP_TYPE) { 4049 index = ibmvfc_get_prli_rsp(be16_to_cpu(parms->flags)); 4050 if (prli_rsp[index].logged_in) { 4051 if (be16_to_cpu(parms->flags) & IBMVFC_PRLI_EST_IMG_PAIR) { 4052 tgt->need_login = 0; 4053 tgt->ids.roles = 0; 4054 if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_TARGET_FUNC) 4055 tgt->ids.roles |= FC_PORT_ROLE_FCP_TARGET; 4056 if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_INITIATOR_FUNC) 4057 tgt->ids.roles |= FC_PORT_ROLE_FCP_INITIATOR; 4058 tgt->add_rport = 1; 4059 } else 4060 ibmvfc_del_tgt(tgt); 4061 } else if (prli_rsp[index].retry) 4062 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli); 4063 else 4064 ibmvfc_del_tgt(tgt); 4065 } else 4066 ibmvfc_del_tgt(tgt); 4067 break; 4068 case IBMVFC_MAD_DRIVER_FAILED: 4069 break; 4070 case IBMVFC_MAD_CRQ_ERROR: 4071 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli); 4072 break; 4073 case IBMVFC_MAD_FAILED: 4074 default: 4075 if ((be16_to_cpu(rsp->status) & IBMVFC_VIOS_FAILURE) && 4076 be16_to_cpu(rsp->error) == IBMVFC_PLOGI_REQUIRED) 4077 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi); 4078 else if (tgt->logo_rcvd) 4079 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi); 4080 else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error))) 4081 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli); 4082 else 4083 ibmvfc_del_tgt(tgt); 4084 4085 tgt_log(tgt, level, "Process Login failed: %s (%x:%x) rc=0x%02X\n", 4086 ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)), 4087 be16_to_cpu(rsp->status), be16_to_cpu(rsp->error), status); 4088 break; 4089 } 4090 4091 kref_put(&tgt->kref, ibmvfc_release_tgt); 4092 ibmvfc_free_event(evt); 4093 wake_up(&vhost->work_wait_q); 4094 } 4095 4096 /** 4097 * ibmvfc_tgt_send_prli - Send a process login 4098 * @tgt: ibmvfc target struct 4099 * 4100 **/ 4101 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *tgt) 4102 { 4103 struct ibmvfc_process_login *prli; 4104 struct ibmvfc_host *vhost = tgt->vhost; 4105 struct ibmvfc_event *evt; 4106 4107 if (vhost->discovery_threads >= disc_threads) 4108 return; 4109 4110 kref_get(&tgt->kref); 4111 evt = ibmvfc_get_reserved_event(&vhost->crq); 4112 if (!evt) { 4113 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4114 kref_put(&tgt->kref, ibmvfc_release_tgt); 4115 __ibmvfc_reset_host(vhost); 4116 return; 4117 } 4118 vhost->discovery_threads++; 4119 ibmvfc_init_event(evt, ibmvfc_tgt_prli_done, IBMVFC_MAD_FORMAT); 4120 evt->tgt = tgt; 4121 prli = &evt->iu.prli; 4122 memset(prli, 0, sizeof(*prli)); 4123 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) { 4124 prli->common.version = cpu_to_be32(2); 4125 prli->target_wwpn = cpu_to_be64(tgt->wwpn); 4126 } else { 4127 prli->common.version = cpu_to_be32(1); 4128 } 4129 prli->common.opcode = cpu_to_be32(IBMVFC_PROCESS_LOGIN); 4130 prli->common.length = cpu_to_be16(sizeof(*prli)); 4131 prli->scsi_id = cpu_to_be64(tgt->scsi_id); 4132 4133 prli->parms.type = IBMVFC_SCSI_FCP_TYPE; 4134 prli->parms.flags = cpu_to_be16(IBMVFC_PRLI_EST_IMG_PAIR); 4135 prli->parms.service_parms = cpu_to_be32(IBMVFC_PRLI_INITIATOR_FUNC); 4136 prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_READ_FCP_XFER_RDY_DISABLED); 4137 4138 if (cls3_error) 4139 prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_RETRY); 4140 4141 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT); 4142 if (ibmvfc_send_event(evt, vhost, default_timeout)) { 4143 vhost->discovery_threads--; 4144 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4145 kref_put(&tgt->kref, ibmvfc_release_tgt); 4146 } else 4147 tgt_dbg(tgt, "Sent process login\n"); 4148 } 4149 4150 /** 4151 * ibmvfc_tgt_plogi_done - Completion handler for Port Login 4152 * @evt: ibmvfc event struct 4153 * 4154 **/ 4155 static void ibmvfc_tgt_plogi_done(struct ibmvfc_event *evt) 4156 { 4157 struct ibmvfc_target *tgt = evt->tgt; 4158 struct ibmvfc_host *vhost = evt->vhost; 4159 struct ibmvfc_port_login *rsp = &evt->xfer_iu->plogi; 4160 u32 status = be16_to_cpu(rsp->common.status); 4161 int level = IBMVFC_DEFAULT_LOG_LEVEL; 4162 4163 vhost->discovery_threads--; 4164 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4165 switch (status) { 4166 case IBMVFC_MAD_SUCCESS: 4167 tgt_dbg(tgt, "Port Login succeeded\n"); 4168 if (tgt->ids.port_name && 4169 tgt->ids.port_name != wwn_to_u64(rsp->service_parms.port_name)) { 4170 vhost->reinit = 1; 4171 tgt_dbg(tgt, "Port re-init required\n"); 4172 break; 4173 } 4174 tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name); 4175 tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name); 4176 tgt->ids.port_id = tgt->scsi_id; 4177 memcpy(&tgt->service_parms, &rsp->service_parms, 4178 sizeof(tgt->service_parms)); 4179 memcpy(&tgt->service_parms_change, &rsp->service_parms_change, 4180 sizeof(tgt->service_parms_change)); 4181 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli); 4182 break; 4183 case IBMVFC_MAD_DRIVER_FAILED: 4184 break; 4185 case IBMVFC_MAD_CRQ_ERROR: 4186 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi); 4187 break; 4188 case IBMVFC_MAD_FAILED: 4189 default: 4190 if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error))) 4191 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi); 4192 else 4193 ibmvfc_del_tgt(tgt); 4194 4195 tgt_log(tgt, level, "Port Login failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n", 4196 ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)), 4197 be16_to_cpu(rsp->status), be16_to_cpu(rsp->error), 4198 ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)), be16_to_cpu(rsp->fc_type), 4199 ibmvfc_get_ls_explain(be16_to_cpu(rsp->fc_explain)), be16_to_cpu(rsp->fc_explain), status); 4200 break; 4201 } 4202 4203 kref_put(&tgt->kref, ibmvfc_release_tgt); 4204 ibmvfc_free_event(evt); 4205 wake_up(&vhost->work_wait_q); 4206 } 4207 4208 /** 4209 * ibmvfc_tgt_send_plogi - Send PLOGI to the specified target 4210 * @tgt: ibmvfc target struct 4211 * 4212 **/ 4213 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *tgt) 4214 { 4215 struct ibmvfc_port_login *plogi; 4216 struct ibmvfc_host *vhost = tgt->vhost; 4217 struct ibmvfc_event *evt; 4218 4219 if (vhost->discovery_threads >= disc_threads) 4220 return; 4221 4222 kref_get(&tgt->kref); 4223 tgt->logo_rcvd = 0; 4224 evt = ibmvfc_get_reserved_event(&vhost->crq); 4225 if (!evt) { 4226 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4227 kref_put(&tgt->kref, ibmvfc_release_tgt); 4228 __ibmvfc_reset_host(vhost); 4229 return; 4230 } 4231 vhost->discovery_threads++; 4232 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT); 4233 ibmvfc_init_event(evt, ibmvfc_tgt_plogi_done, IBMVFC_MAD_FORMAT); 4234 evt->tgt = tgt; 4235 plogi = &evt->iu.plogi; 4236 memset(plogi, 0, sizeof(*plogi)); 4237 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) { 4238 plogi->common.version = cpu_to_be32(2); 4239 plogi->target_wwpn = cpu_to_be64(tgt->wwpn); 4240 } else { 4241 plogi->common.version = cpu_to_be32(1); 4242 } 4243 plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN); 4244 plogi->common.length = cpu_to_be16(sizeof(*plogi)); 4245 plogi->scsi_id = cpu_to_be64(tgt->scsi_id); 4246 4247 if (ibmvfc_send_event(evt, vhost, default_timeout)) { 4248 vhost->discovery_threads--; 4249 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4250 kref_put(&tgt->kref, ibmvfc_release_tgt); 4251 } else 4252 tgt_dbg(tgt, "Sent port login\n"); 4253 } 4254 4255 /** 4256 * ibmvfc_tgt_implicit_logout_done - Completion handler for Implicit Logout MAD 4257 * @evt: ibmvfc event struct 4258 * 4259 **/ 4260 static void ibmvfc_tgt_implicit_logout_done(struct ibmvfc_event *evt) 4261 { 4262 struct ibmvfc_target *tgt = evt->tgt; 4263 struct ibmvfc_host *vhost = evt->vhost; 4264 struct ibmvfc_implicit_logout *rsp = &evt->xfer_iu->implicit_logout; 4265 u32 status = be16_to_cpu(rsp->common.status); 4266 4267 vhost->discovery_threads--; 4268 ibmvfc_free_event(evt); 4269 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4270 4271 switch (status) { 4272 case IBMVFC_MAD_SUCCESS: 4273 tgt_dbg(tgt, "Implicit Logout succeeded\n"); 4274 break; 4275 case IBMVFC_MAD_DRIVER_FAILED: 4276 kref_put(&tgt->kref, ibmvfc_release_tgt); 4277 wake_up(&vhost->work_wait_q); 4278 return; 4279 case IBMVFC_MAD_FAILED: 4280 default: 4281 tgt_err(tgt, "Implicit Logout failed: rc=0x%02X\n", status); 4282 break; 4283 } 4284 4285 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_plogi); 4286 kref_put(&tgt->kref, ibmvfc_release_tgt); 4287 wake_up(&vhost->work_wait_q); 4288 } 4289 4290 /** 4291 * __ibmvfc_tgt_get_implicit_logout_evt - Allocate and init an event for implicit logout 4292 * @tgt: ibmvfc target struct 4293 * @done: Routine to call when the event is responded to 4294 * 4295 * Returns: 4296 * Allocated and initialized ibmvfc_event struct 4297 **/ 4298 static struct ibmvfc_event *__ibmvfc_tgt_get_implicit_logout_evt(struct ibmvfc_target *tgt, 4299 void (*done) (struct ibmvfc_event *)) 4300 { 4301 struct ibmvfc_implicit_logout *mad; 4302 struct ibmvfc_host *vhost = tgt->vhost; 4303 struct ibmvfc_event *evt; 4304 4305 kref_get(&tgt->kref); 4306 evt = ibmvfc_get_reserved_event(&vhost->crq); 4307 if (!evt) 4308 return NULL; 4309 ibmvfc_init_event(evt, done, IBMVFC_MAD_FORMAT); 4310 evt->tgt = tgt; 4311 mad = &evt->iu.implicit_logout; 4312 memset(mad, 0, sizeof(*mad)); 4313 mad->common.version = cpu_to_be32(1); 4314 mad->common.opcode = cpu_to_be32(IBMVFC_IMPLICIT_LOGOUT); 4315 mad->common.length = cpu_to_be16(sizeof(*mad)); 4316 mad->old_scsi_id = cpu_to_be64(tgt->scsi_id); 4317 return evt; 4318 } 4319 4320 /** 4321 * ibmvfc_tgt_implicit_logout - Initiate an Implicit Logout for specified target 4322 * @tgt: ibmvfc target struct 4323 * 4324 **/ 4325 static void ibmvfc_tgt_implicit_logout(struct ibmvfc_target *tgt) 4326 { 4327 struct ibmvfc_host *vhost = tgt->vhost; 4328 struct ibmvfc_event *evt; 4329 4330 if (vhost->discovery_threads >= disc_threads) 4331 return; 4332 4333 vhost->discovery_threads++; 4334 evt = __ibmvfc_tgt_get_implicit_logout_evt(tgt, 4335 ibmvfc_tgt_implicit_logout_done); 4336 if (!evt) { 4337 vhost->discovery_threads--; 4338 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4339 kref_put(&tgt->kref, ibmvfc_release_tgt); 4340 __ibmvfc_reset_host(vhost); 4341 return; 4342 } 4343 4344 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT); 4345 if (ibmvfc_send_event(evt, vhost, default_timeout)) { 4346 vhost->discovery_threads--; 4347 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4348 kref_put(&tgt->kref, ibmvfc_release_tgt); 4349 } else 4350 tgt_dbg(tgt, "Sent Implicit Logout\n"); 4351 } 4352 4353 /** 4354 * ibmvfc_tgt_implicit_logout_and_del_done - Completion handler for Implicit Logout MAD 4355 * @evt: ibmvfc event struct 4356 * 4357 **/ 4358 static void ibmvfc_tgt_implicit_logout_and_del_done(struct ibmvfc_event *evt) 4359 { 4360 struct ibmvfc_target *tgt = evt->tgt; 4361 struct ibmvfc_host *vhost = evt->vhost; 4362 struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru; 4363 u32 status = be16_to_cpu(mad->common.status); 4364 4365 vhost->discovery_threads--; 4366 ibmvfc_free_event(evt); 4367 4368 /* 4369 * If our state is IBMVFC_HOST_OFFLINE, we could be unloading the 4370 * driver in which case we need to free up all the targets. If we are 4371 * not unloading, we will still go through a hard reset to get out of 4372 * offline state, so there is no need to track the old targets in that 4373 * case. 4374 */ 4375 if (status == IBMVFC_MAD_SUCCESS || vhost->state == IBMVFC_HOST_OFFLINE) 4376 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); 4377 else 4378 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT); 4379 4380 tgt_dbg(tgt, "Implicit Logout %s\n", (status == IBMVFC_MAD_SUCCESS) ? "succeeded" : "failed"); 4381 kref_put(&tgt->kref, ibmvfc_release_tgt); 4382 wake_up(&vhost->work_wait_q); 4383 } 4384 4385 /** 4386 * ibmvfc_tgt_implicit_logout_and_del - Initiate an Implicit Logout for specified target 4387 * @tgt: ibmvfc target struct 4388 * 4389 **/ 4390 static void ibmvfc_tgt_implicit_logout_and_del(struct ibmvfc_target *tgt) 4391 { 4392 struct ibmvfc_host *vhost = tgt->vhost; 4393 struct ibmvfc_event *evt; 4394 4395 if (!vhost->logged_in) { 4396 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); 4397 return; 4398 } 4399 4400 if (vhost->discovery_threads >= disc_threads) 4401 return; 4402 4403 vhost->discovery_threads++; 4404 evt = __ibmvfc_tgt_get_implicit_logout_evt(tgt, 4405 ibmvfc_tgt_implicit_logout_and_del_done); 4406 4407 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT); 4408 if (ibmvfc_send_event(evt, vhost, default_timeout)) { 4409 vhost->discovery_threads--; 4410 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); 4411 kref_put(&tgt->kref, ibmvfc_release_tgt); 4412 } else 4413 tgt_dbg(tgt, "Sent Implicit Logout\n"); 4414 } 4415 4416 /** 4417 * ibmvfc_tgt_move_login_done - Completion handler for Move Login 4418 * @evt: ibmvfc event struct 4419 * 4420 **/ 4421 static void ibmvfc_tgt_move_login_done(struct ibmvfc_event *evt) 4422 { 4423 struct ibmvfc_target *tgt = evt->tgt; 4424 struct ibmvfc_host *vhost = evt->vhost; 4425 struct ibmvfc_move_login *rsp = &evt->xfer_iu->move_login; 4426 u32 status = be16_to_cpu(rsp->common.status); 4427 int level = IBMVFC_DEFAULT_LOG_LEVEL; 4428 4429 vhost->discovery_threads--; 4430 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4431 switch (status) { 4432 case IBMVFC_MAD_SUCCESS: 4433 tgt_dbg(tgt, "Move Login succeeded for new scsi_id: %llX\n", tgt->new_scsi_id); 4434 tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name); 4435 tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name); 4436 tgt->scsi_id = tgt->new_scsi_id; 4437 tgt->ids.port_id = tgt->scsi_id; 4438 memcpy(&tgt->service_parms, &rsp->service_parms, 4439 sizeof(tgt->service_parms)); 4440 memcpy(&tgt->service_parms_change, &rsp->service_parms_change, 4441 sizeof(tgt->service_parms_change)); 4442 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli); 4443 break; 4444 case IBMVFC_MAD_DRIVER_FAILED: 4445 break; 4446 case IBMVFC_MAD_CRQ_ERROR: 4447 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_move_login); 4448 break; 4449 case IBMVFC_MAD_FAILED: 4450 default: 4451 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_move_login); 4452 4453 tgt_log(tgt, level, 4454 "Move Login failed: new scsi_id: %llX, flags:%x, vios_flags:%x, rc=0x%02X\n", 4455 tgt->new_scsi_id, be32_to_cpu(rsp->flags), be16_to_cpu(rsp->vios_flags), 4456 status); 4457 break; 4458 } 4459 4460 kref_put(&tgt->kref, ibmvfc_release_tgt); 4461 ibmvfc_free_event(evt); 4462 wake_up(&vhost->work_wait_q); 4463 } 4464 4465 4466 /** 4467 * ibmvfc_tgt_move_login - Initiate a move login for specified target 4468 * @tgt: ibmvfc target struct 4469 * 4470 **/ 4471 static void ibmvfc_tgt_move_login(struct ibmvfc_target *tgt) 4472 { 4473 struct ibmvfc_host *vhost = tgt->vhost; 4474 struct ibmvfc_move_login *move; 4475 struct ibmvfc_event *evt; 4476 4477 if (vhost->discovery_threads >= disc_threads) 4478 return; 4479 4480 kref_get(&tgt->kref); 4481 evt = ibmvfc_get_reserved_event(&vhost->crq); 4482 if (!evt) { 4483 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); 4484 kref_put(&tgt->kref, ibmvfc_release_tgt); 4485 __ibmvfc_reset_host(vhost); 4486 return; 4487 } 4488 vhost->discovery_threads++; 4489 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT); 4490 ibmvfc_init_event(evt, ibmvfc_tgt_move_login_done, IBMVFC_MAD_FORMAT); 4491 evt->tgt = tgt; 4492 move = &evt->iu.move_login; 4493 memset(move, 0, sizeof(*move)); 4494 move->common.version = cpu_to_be32(1); 4495 move->common.opcode = cpu_to_be32(IBMVFC_MOVE_LOGIN); 4496 move->common.length = cpu_to_be16(sizeof(*move)); 4497 4498 move->old_scsi_id = cpu_to_be64(tgt->scsi_id); 4499 move->new_scsi_id = cpu_to_be64(tgt->new_scsi_id); 4500 move->wwpn = cpu_to_be64(tgt->wwpn); 4501 move->node_name = cpu_to_be64(tgt->ids.node_name); 4502 4503 if (ibmvfc_send_event(evt, vhost, default_timeout)) { 4504 vhost->discovery_threads--; 4505 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); 4506 kref_put(&tgt->kref, ibmvfc_release_tgt); 4507 } else 4508 tgt_dbg(tgt, "Sent Move Login for new scsi_id: %llX\n", tgt->new_scsi_id); 4509 } 4510 4511 /** 4512 * ibmvfc_adisc_needs_plogi - Does device need PLOGI? 4513 * @mad: ibmvfc passthru mad struct 4514 * @tgt: ibmvfc target struct 4515 * 4516 * Returns: 4517 * 1 if PLOGI needed / 0 if PLOGI not needed 4518 **/ 4519 static int ibmvfc_adisc_needs_plogi(struct ibmvfc_passthru_mad *mad, 4520 struct ibmvfc_target *tgt) 4521 { 4522 if (wwn_to_u64((u8 *)&mad->fc_iu.response[2]) != tgt->ids.port_name) 4523 return 1; 4524 if (wwn_to_u64((u8 *)&mad->fc_iu.response[4]) != tgt->ids.node_name) 4525 return 1; 4526 if (be32_to_cpu(mad->fc_iu.response[6]) != tgt->scsi_id) 4527 return 1; 4528 return 0; 4529 } 4530 4531 /** 4532 * ibmvfc_tgt_adisc_done - Completion handler for ADISC 4533 * @evt: ibmvfc event struct 4534 * 4535 **/ 4536 static void ibmvfc_tgt_adisc_done(struct ibmvfc_event *evt) 4537 { 4538 struct ibmvfc_target *tgt = evt->tgt; 4539 struct ibmvfc_host *vhost = evt->vhost; 4540 struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru; 4541 u32 status = be16_to_cpu(mad->common.status); 4542 u8 fc_reason, fc_explain; 4543 4544 vhost->discovery_threads--; 4545 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4546 timer_delete(&tgt->timer); 4547 4548 switch (status) { 4549 case IBMVFC_MAD_SUCCESS: 4550 tgt_dbg(tgt, "ADISC succeeded\n"); 4551 if (ibmvfc_adisc_needs_plogi(mad, tgt)) 4552 ibmvfc_del_tgt(tgt); 4553 break; 4554 case IBMVFC_MAD_DRIVER_FAILED: 4555 break; 4556 case IBMVFC_MAD_FAILED: 4557 default: 4558 ibmvfc_del_tgt(tgt); 4559 fc_reason = (be32_to_cpu(mad->fc_iu.response[1]) & 0x00ff0000) >> 16; 4560 fc_explain = (be32_to_cpu(mad->fc_iu.response[1]) & 0x0000ff00) >> 8; 4561 tgt_info(tgt, "ADISC failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n", 4562 ibmvfc_get_cmd_error(be16_to_cpu(mad->iu.status), be16_to_cpu(mad->iu.error)), 4563 be16_to_cpu(mad->iu.status), be16_to_cpu(mad->iu.error), 4564 ibmvfc_get_fc_type(fc_reason), fc_reason, 4565 ibmvfc_get_ls_explain(fc_explain), fc_explain, status); 4566 break; 4567 } 4568 4569 kref_put(&tgt->kref, ibmvfc_release_tgt); 4570 ibmvfc_free_event(evt); 4571 wake_up(&vhost->work_wait_q); 4572 } 4573 4574 /** 4575 * ibmvfc_init_passthru - Initialize an event struct for FC passthru 4576 * @evt: ibmvfc event struct 4577 * 4578 **/ 4579 static void ibmvfc_init_passthru(struct ibmvfc_event *evt) 4580 { 4581 struct ibmvfc_passthru_mad *mad = &evt->iu.passthru; 4582 4583 memset(mad, 0, sizeof(*mad)); 4584 mad->common.version = cpu_to_be32(1); 4585 mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU); 4586 mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu)); 4587 mad->cmd_ioba.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) + 4588 offsetof(struct ibmvfc_passthru_mad, iu)); 4589 mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu)); 4590 mad->iu.cmd_len = cpu_to_be32(sizeof(mad->fc_iu.payload)); 4591 mad->iu.rsp_len = cpu_to_be32(sizeof(mad->fc_iu.response)); 4592 mad->iu.cmd.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) + 4593 offsetof(struct ibmvfc_passthru_mad, fc_iu) + 4594 offsetof(struct ibmvfc_passthru_fc_iu, payload)); 4595 mad->iu.cmd.len = cpu_to_be32(sizeof(mad->fc_iu.payload)); 4596 mad->iu.rsp.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) + 4597 offsetof(struct ibmvfc_passthru_mad, fc_iu) + 4598 offsetof(struct ibmvfc_passthru_fc_iu, response)); 4599 mad->iu.rsp.len = cpu_to_be32(sizeof(mad->fc_iu.response)); 4600 } 4601 4602 /** 4603 * ibmvfc_tgt_adisc_cancel_done - Completion handler when cancelling an ADISC 4604 * @evt: ibmvfc event struct 4605 * 4606 * Just cleanup this event struct. Everything else is handled by 4607 * the ADISC completion handler. If the ADISC never actually comes 4608 * back, we still have the timer running on the ADISC event struct 4609 * which will fire and cause the CRQ to get reset. 4610 * 4611 **/ 4612 static void ibmvfc_tgt_adisc_cancel_done(struct ibmvfc_event *evt) 4613 { 4614 struct ibmvfc_host *vhost = evt->vhost; 4615 struct ibmvfc_target *tgt = evt->tgt; 4616 4617 tgt_dbg(tgt, "ADISC cancel complete\n"); 4618 vhost->abort_threads--; 4619 ibmvfc_free_event(evt); 4620 kref_put(&tgt->kref, ibmvfc_release_tgt); 4621 wake_up(&vhost->work_wait_q); 4622 } 4623 4624 /** 4625 * ibmvfc_adisc_timeout - Handle an ADISC timeout 4626 * @t: ibmvfc target struct 4627 * 4628 * If an ADISC times out, send a cancel. If the cancel times 4629 * out, reset the CRQ. When the ADISC comes back as cancelled, 4630 * log back into the target. 4631 **/ 4632 static void ibmvfc_adisc_timeout(struct timer_list *t) 4633 { 4634 struct ibmvfc_target *tgt = timer_container_of(tgt, t, timer); 4635 struct ibmvfc_host *vhost = tgt->vhost; 4636 struct ibmvfc_event *evt; 4637 struct ibmvfc_tmf *tmf; 4638 unsigned long flags; 4639 int rc; 4640 4641 tgt_dbg(tgt, "ADISC timeout\n"); 4642 spin_lock_irqsave(vhost->host->host_lock, flags); 4643 if (vhost->abort_threads >= disc_threads || 4644 tgt->action != IBMVFC_TGT_ACTION_INIT_WAIT || 4645 vhost->state != IBMVFC_INITIALIZING || 4646 vhost->action != IBMVFC_HOST_ACTION_QUERY_TGTS) { 4647 spin_unlock_irqrestore(vhost->host->host_lock, flags); 4648 return; 4649 } 4650 4651 vhost->abort_threads++; 4652 kref_get(&tgt->kref); 4653 evt = ibmvfc_get_reserved_event(&vhost->crq); 4654 if (!evt) { 4655 tgt_err(tgt, "Failed to get cancel event for ADISC.\n"); 4656 vhost->abort_threads--; 4657 kref_put(&tgt->kref, ibmvfc_release_tgt); 4658 __ibmvfc_reset_host(vhost); 4659 spin_unlock_irqrestore(vhost->host->host_lock, flags); 4660 return; 4661 } 4662 ibmvfc_init_event(evt, ibmvfc_tgt_adisc_cancel_done, IBMVFC_MAD_FORMAT); 4663 4664 evt->tgt = tgt; 4665 tmf = &evt->iu.tmf; 4666 memset(tmf, 0, sizeof(*tmf)); 4667 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) { 4668 tmf->common.version = cpu_to_be32(2); 4669 tmf->target_wwpn = cpu_to_be64(tgt->wwpn); 4670 } else { 4671 tmf->common.version = cpu_to_be32(1); 4672 } 4673 tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD); 4674 tmf->common.length = cpu_to_be16(sizeof(*tmf)); 4675 tmf->scsi_id = cpu_to_be64(tgt->scsi_id); 4676 tmf->cancel_key = cpu_to_be32(tgt->cancel_key); 4677 4678 rc = ibmvfc_send_event(evt, vhost, default_timeout); 4679 4680 if (rc) { 4681 tgt_err(tgt, "Failed to send cancel event for ADISC. rc=%d\n", rc); 4682 vhost->abort_threads--; 4683 kref_put(&tgt->kref, ibmvfc_release_tgt); 4684 __ibmvfc_reset_host(vhost); 4685 } else 4686 tgt_dbg(tgt, "Attempting to cancel ADISC\n"); 4687 spin_unlock_irqrestore(vhost->host->host_lock, flags); 4688 } 4689 4690 /** 4691 * ibmvfc_tgt_adisc - Initiate an ADISC for specified target 4692 * @tgt: ibmvfc target struct 4693 * 4694 * When sending an ADISC we end up with two timers running. The 4695 * first timer is the timer in the ibmvfc target struct. If this 4696 * fires, we send a cancel to the target. The second timer is the 4697 * timer on the ibmvfc event for the ADISC, which is longer. If that 4698 * fires, it means the ADISC timed out and our attempt to cancel it 4699 * also failed, so we need to reset the CRQ. 4700 **/ 4701 static void ibmvfc_tgt_adisc(struct ibmvfc_target *tgt) 4702 { 4703 struct ibmvfc_passthru_mad *mad; 4704 struct ibmvfc_host *vhost = tgt->vhost; 4705 struct ibmvfc_event *evt; 4706 4707 if (vhost->discovery_threads >= disc_threads) 4708 return; 4709 4710 kref_get(&tgt->kref); 4711 evt = ibmvfc_get_reserved_event(&vhost->crq); 4712 if (!evt) { 4713 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4714 kref_put(&tgt->kref, ibmvfc_release_tgt); 4715 __ibmvfc_reset_host(vhost); 4716 return; 4717 } 4718 vhost->discovery_threads++; 4719 ibmvfc_init_event(evt, ibmvfc_tgt_adisc_done, IBMVFC_MAD_FORMAT); 4720 evt->tgt = tgt; 4721 4722 ibmvfc_init_passthru(evt); 4723 mad = &evt->iu.passthru; 4724 mad->iu.flags = cpu_to_be32(IBMVFC_FC_ELS); 4725 mad->iu.scsi_id = cpu_to_be64(tgt->scsi_id); 4726 mad->iu.cancel_key = cpu_to_be32(tgt->cancel_key); 4727 4728 mad->fc_iu.payload[0] = cpu_to_be32(IBMVFC_ADISC); 4729 memcpy(&mad->fc_iu.payload[2], &vhost->login_buf->resp.port_name, 4730 sizeof(vhost->login_buf->resp.port_name)); 4731 memcpy(&mad->fc_iu.payload[4], &vhost->login_buf->resp.node_name, 4732 sizeof(vhost->login_buf->resp.node_name)); 4733 mad->fc_iu.payload[6] = cpu_to_be32(be64_to_cpu(vhost->login_buf->resp.scsi_id) & 0x00ffffff); 4734 4735 if (timer_pending(&tgt->timer)) 4736 mod_timer(&tgt->timer, jiffies + (IBMVFC_ADISC_TIMEOUT * HZ)); 4737 else { 4738 tgt->timer.expires = jiffies + (IBMVFC_ADISC_TIMEOUT * HZ); 4739 add_timer(&tgt->timer); 4740 } 4741 4742 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT); 4743 if (ibmvfc_send_event(evt, vhost, IBMVFC_ADISC_PLUS_CANCEL_TIMEOUT)) { 4744 vhost->discovery_threads--; 4745 timer_delete(&tgt->timer); 4746 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4747 kref_put(&tgt->kref, ibmvfc_release_tgt); 4748 } else 4749 tgt_dbg(tgt, "Sent ADISC\n"); 4750 } 4751 4752 /** 4753 * ibmvfc_tgt_query_target_done - Completion handler for Query Target MAD 4754 * @evt: ibmvfc event struct 4755 * 4756 **/ 4757 static void ibmvfc_tgt_query_target_done(struct ibmvfc_event *evt) 4758 { 4759 struct ibmvfc_target *tgt = evt->tgt; 4760 struct ibmvfc_host *vhost = evt->vhost; 4761 struct ibmvfc_query_tgt *rsp = &evt->xfer_iu->query_tgt; 4762 u32 status = be16_to_cpu(rsp->common.status); 4763 int level = IBMVFC_DEFAULT_LOG_LEVEL; 4764 4765 vhost->discovery_threads--; 4766 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4767 switch (status) { 4768 case IBMVFC_MAD_SUCCESS: 4769 tgt_dbg(tgt, "Query Target succeeded\n"); 4770 if (be64_to_cpu(rsp->scsi_id) != tgt->scsi_id) 4771 ibmvfc_del_tgt(tgt); 4772 else 4773 ibmvfc_init_tgt(tgt, ibmvfc_tgt_adisc); 4774 break; 4775 case IBMVFC_MAD_DRIVER_FAILED: 4776 break; 4777 case IBMVFC_MAD_CRQ_ERROR: 4778 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target); 4779 break; 4780 case IBMVFC_MAD_FAILED: 4781 default: 4782 if ((be16_to_cpu(rsp->status) & IBMVFC_FABRIC_MAPPED) == IBMVFC_FABRIC_MAPPED && 4783 be16_to_cpu(rsp->error) == IBMVFC_UNABLE_TO_PERFORM_REQ && 4784 be16_to_cpu(rsp->fc_explain) == IBMVFC_PORT_NAME_NOT_REG) 4785 ibmvfc_del_tgt(tgt); 4786 else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error))) 4787 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target); 4788 else 4789 ibmvfc_del_tgt(tgt); 4790 4791 tgt_log(tgt, level, "Query Target failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n", 4792 ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)), 4793 be16_to_cpu(rsp->status), be16_to_cpu(rsp->error), 4794 ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)), be16_to_cpu(rsp->fc_type), 4795 ibmvfc_get_gs_explain(be16_to_cpu(rsp->fc_explain)), be16_to_cpu(rsp->fc_explain), 4796 status); 4797 break; 4798 } 4799 4800 kref_put(&tgt->kref, ibmvfc_release_tgt); 4801 ibmvfc_free_event(evt); 4802 wake_up(&vhost->work_wait_q); 4803 } 4804 4805 /** 4806 * ibmvfc_tgt_query_target - Initiate a Query Target for specified target 4807 * @tgt: ibmvfc target struct 4808 * 4809 **/ 4810 static void ibmvfc_tgt_query_target(struct ibmvfc_target *tgt) 4811 { 4812 struct ibmvfc_query_tgt *query_tgt; 4813 struct ibmvfc_host *vhost = tgt->vhost; 4814 struct ibmvfc_event *evt; 4815 4816 if (vhost->discovery_threads >= disc_threads) 4817 return; 4818 4819 kref_get(&tgt->kref); 4820 evt = ibmvfc_get_reserved_event(&vhost->crq); 4821 if (!evt) { 4822 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4823 kref_put(&tgt->kref, ibmvfc_release_tgt); 4824 __ibmvfc_reset_host(vhost); 4825 return; 4826 } 4827 vhost->discovery_threads++; 4828 evt->tgt = tgt; 4829 ibmvfc_init_event(evt, ibmvfc_tgt_query_target_done, IBMVFC_MAD_FORMAT); 4830 query_tgt = &evt->iu.query_tgt; 4831 memset(query_tgt, 0, sizeof(*query_tgt)); 4832 query_tgt->common.version = cpu_to_be32(1); 4833 query_tgt->common.opcode = cpu_to_be32(IBMVFC_QUERY_TARGET); 4834 query_tgt->common.length = cpu_to_be16(sizeof(*query_tgt)); 4835 query_tgt->wwpn = cpu_to_be64(tgt->ids.port_name); 4836 4837 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT); 4838 if (ibmvfc_send_event(evt, vhost, default_timeout)) { 4839 vhost->discovery_threads--; 4840 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4841 kref_put(&tgt->kref, ibmvfc_release_tgt); 4842 } else 4843 tgt_dbg(tgt, "Sent Query Target\n"); 4844 } 4845 4846 /** 4847 * ibmvfc_alloc_target - Allocate and initialize an ibmvfc target 4848 * @vhost: ibmvfc host struct 4849 * @target: Holds SCSI ID to allocate target forand the WWPN 4850 * 4851 * Returns: 4852 * 0 on success / other on failure 4853 **/ 4854 static int ibmvfc_alloc_target(struct ibmvfc_host *vhost, 4855 struct ibmvfc_discover_targets_entry *target) 4856 { 4857 struct ibmvfc_target *stgt = NULL; 4858 struct ibmvfc_target *wtgt = NULL; 4859 struct ibmvfc_target *tgt; 4860 unsigned long flags; 4861 u64 scsi_id = be32_to_cpu(target->scsi_id) & IBMVFC_DISC_TGT_SCSI_ID_MASK; 4862 u64 wwpn = be64_to_cpu(target->wwpn); 4863 4864 /* Look to see if we already have a target allocated for this SCSI ID or WWPN */ 4865 spin_lock_irqsave(vhost->host->host_lock, flags); 4866 list_for_each_entry(tgt, &vhost->targets, queue) { 4867 if (tgt->wwpn == wwpn) { 4868 wtgt = tgt; 4869 break; 4870 } 4871 } 4872 4873 list_for_each_entry(tgt, &vhost->targets, queue) { 4874 if (tgt->scsi_id == scsi_id) { 4875 stgt = tgt; 4876 break; 4877 } 4878 } 4879 4880 if (wtgt && !stgt) { 4881 /* 4882 * A WWPN target has moved and we still are tracking the old 4883 * SCSI ID. The only way we should be able to get here is if 4884 * we attempted to send an implicit logout for the old SCSI ID 4885 * and it failed for some reason, such as there being I/O 4886 * pending to the target. In this case, we will have already 4887 * deleted the rport from the FC transport so we do a move 4888 * login, which works even with I/O pending, however, if 4889 * there is still I/O pending, it will stay outstanding, so 4890 * we only do this if fast fail is disabled for the rport, 4891 * otherwise we let terminate_rport_io clean up the port 4892 * before we login at the new location. 4893 */ 4894 if (wtgt->action == IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT) { 4895 if (wtgt->move_login) { 4896 /* 4897 * Do a move login here. The old target is no longer 4898 * known to the transport layer We don't use the 4899 * normal ibmvfc_set_tgt_action to set this, as we 4900 * don't normally want to allow this state change. 4901 */ 4902 wtgt->new_scsi_id = scsi_id; 4903 wtgt->action = IBMVFC_TGT_ACTION_INIT; 4904 wtgt->init_retries = 0; 4905 ibmvfc_init_tgt(wtgt, ibmvfc_tgt_move_login); 4906 } 4907 goto unlock_out; 4908 } else { 4909 tgt_err(wtgt, "Unexpected target state: %d, %p\n", 4910 wtgt->action, wtgt->rport); 4911 } 4912 } else if (stgt) { 4913 if (tgt->need_login) 4914 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout); 4915 goto unlock_out; 4916 } 4917 spin_unlock_irqrestore(vhost->host->host_lock, flags); 4918 4919 tgt = mempool_alloc(vhost->tgt_pool, GFP_NOIO); 4920 memset(tgt, 0, sizeof(*tgt)); 4921 tgt->scsi_id = scsi_id; 4922 tgt->wwpn = wwpn; 4923 tgt->vhost = vhost; 4924 tgt->need_login = 1; 4925 timer_setup(&tgt->timer, ibmvfc_adisc_timeout, 0); 4926 kref_init(&tgt->kref); 4927 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout); 4928 spin_lock_irqsave(vhost->host->host_lock, flags); 4929 tgt->cancel_key = vhost->task_set++; 4930 list_add_tail(&tgt->queue, &vhost->targets); 4931 4932 unlock_out: 4933 spin_unlock_irqrestore(vhost->host->host_lock, flags); 4934 return 0; 4935 } 4936 4937 /** 4938 * ibmvfc_alloc_targets - Allocate and initialize ibmvfc targets 4939 * @vhost: ibmvfc host struct 4940 * 4941 * Returns: 4942 * 0 on success / other on failure 4943 **/ 4944 static int ibmvfc_alloc_targets(struct ibmvfc_host *vhost) 4945 { 4946 int i, rc; 4947 4948 for (i = 0, rc = 0; !rc && i < vhost->num_targets; i++) 4949 rc = ibmvfc_alloc_target(vhost, &vhost->scsi_scrqs.disc_buf[i]); 4950 4951 return rc; 4952 } 4953 4954 /** 4955 * ibmvfc_discover_targets_done - Completion handler for discover targets MAD 4956 * @evt: ibmvfc event struct 4957 * 4958 **/ 4959 static void ibmvfc_discover_targets_done(struct ibmvfc_event *evt) 4960 { 4961 struct ibmvfc_host *vhost = evt->vhost; 4962 struct ibmvfc_discover_targets *rsp = &evt->xfer_iu->discover_targets; 4963 u32 mad_status = be16_to_cpu(rsp->common.status); 4964 int level = IBMVFC_DEFAULT_LOG_LEVEL; 4965 4966 switch (mad_status) { 4967 case IBMVFC_MAD_SUCCESS: 4968 ibmvfc_dbg(vhost, "Discover Targets succeeded\n"); 4969 vhost->num_targets = min_t(u32, be32_to_cpu(rsp->num_written), 4970 max_targets); 4971 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_ALLOC_TGTS); 4972 break; 4973 case IBMVFC_MAD_FAILED: 4974 level += ibmvfc_retry_host_init(vhost); 4975 ibmvfc_log(vhost, level, "Discover Targets failed: %s (%x:%x)\n", 4976 ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)), 4977 be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)); 4978 break; 4979 case IBMVFC_MAD_DRIVER_FAILED: 4980 break; 4981 default: 4982 dev_err(vhost->dev, "Invalid Discover Targets response: 0x%x\n", mad_status); 4983 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 4984 break; 4985 } 4986 4987 ibmvfc_free_event(evt); 4988 wake_up(&vhost->work_wait_q); 4989 } 4990 4991 /** 4992 * ibmvfc_discover_targets - Send Discover Targets MAD 4993 * @vhost: ibmvfc host struct 4994 * 4995 **/ 4996 static void ibmvfc_discover_targets(struct ibmvfc_host *vhost) 4997 { 4998 struct ibmvfc_discover_targets *mad; 4999 struct ibmvfc_event *evt = ibmvfc_get_reserved_event(&vhost->crq); 5000 int level = IBMVFC_DEFAULT_LOG_LEVEL; 5001 5002 if (!evt) { 5003 ibmvfc_log(vhost, level, "Discover Targets failed: no available events\n"); 5004 ibmvfc_hard_reset_host(vhost); 5005 return; 5006 } 5007 5008 ibmvfc_init_event(evt, ibmvfc_discover_targets_done, IBMVFC_MAD_FORMAT); 5009 mad = &evt->iu.discover_targets; 5010 memset(mad, 0, sizeof(*mad)); 5011 mad->common.version = cpu_to_be32(1); 5012 mad->common.opcode = cpu_to_be32(IBMVFC_DISC_TARGETS); 5013 mad->common.length = cpu_to_be16(sizeof(*mad)); 5014 mad->bufflen = cpu_to_be32(vhost->scsi_scrqs.disc_buf_sz); 5015 mad->buffer.va = cpu_to_be64(vhost->scsi_scrqs.disc_buf_dma); 5016 mad->buffer.len = cpu_to_be32(vhost->scsi_scrqs.disc_buf_sz); 5017 mad->flags = cpu_to_be32(IBMVFC_DISC_TGT_PORT_ID_WWPN_LIST); 5018 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT); 5019 5020 if (!ibmvfc_send_event(evt, vhost, default_timeout)) 5021 ibmvfc_dbg(vhost, "Sent discover targets\n"); 5022 else 5023 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 5024 } 5025 5026 static void ibmvfc_channel_setup_done(struct ibmvfc_event *evt) 5027 { 5028 struct ibmvfc_host *vhost = evt->vhost; 5029 struct ibmvfc_channel_setup *setup = vhost->channel_setup_buf; 5030 struct ibmvfc_channels *scrqs = &vhost->scsi_scrqs; 5031 u32 mad_status = be16_to_cpu(evt->xfer_iu->channel_setup.common.status); 5032 int level = IBMVFC_DEFAULT_LOG_LEVEL; 5033 int flags, active_queues, i; 5034 5035 ibmvfc_free_event(evt); 5036 5037 switch (mad_status) { 5038 case IBMVFC_MAD_SUCCESS: 5039 ibmvfc_dbg(vhost, "Channel Setup succeeded\n"); 5040 flags = be32_to_cpu(setup->flags); 5041 vhost->do_enquiry = 0; 5042 active_queues = be32_to_cpu(setup->num_scsi_subq_channels); 5043 scrqs->active_queues = active_queues; 5044 5045 if (flags & IBMVFC_CHANNELS_CANCELED) { 5046 ibmvfc_dbg(vhost, "Channels Canceled\n"); 5047 vhost->using_channels = 0; 5048 } else { 5049 if (active_queues) 5050 vhost->using_channels = 1; 5051 for (i = 0; i < active_queues; i++) 5052 scrqs->scrqs[i].vios_cookie = 5053 be64_to_cpu(setup->channel_handles[i]); 5054 5055 ibmvfc_dbg(vhost, "Using %u channels\n", 5056 vhost->scsi_scrqs.active_queues); 5057 } 5058 break; 5059 case IBMVFC_MAD_FAILED: 5060 level += ibmvfc_retry_host_init(vhost); 5061 ibmvfc_log(vhost, level, "Channel Setup failed\n"); 5062 fallthrough; 5063 case IBMVFC_MAD_DRIVER_FAILED: 5064 return; 5065 default: 5066 dev_err(vhost->dev, "Invalid Channel Setup response: 0x%x\n", 5067 mad_status); 5068 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 5069 return; 5070 } 5071 5072 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY); 5073 wake_up(&vhost->work_wait_q); 5074 } 5075 5076 static void ibmvfc_channel_setup(struct ibmvfc_host *vhost) 5077 { 5078 struct ibmvfc_channel_setup_mad *mad; 5079 struct ibmvfc_channel_setup *setup_buf = vhost->channel_setup_buf; 5080 struct ibmvfc_event *evt = ibmvfc_get_reserved_event(&vhost->crq); 5081 struct ibmvfc_channels *scrqs = &vhost->scsi_scrqs; 5082 unsigned int num_channels = 5083 min(scrqs->desired_queues, vhost->max_vios_scsi_channels); 5084 int level = IBMVFC_DEFAULT_LOG_LEVEL; 5085 int i; 5086 5087 if (!evt) { 5088 ibmvfc_log(vhost, level, "Channel Setup failed: no available events\n"); 5089 ibmvfc_hard_reset_host(vhost); 5090 return; 5091 } 5092 5093 memset(setup_buf, 0, sizeof(*setup_buf)); 5094 if (num_channels == 0) 5095 setup_buf->flags = cpu_to_be32(IBMVFC_CANCEL_CHANNELS); 5096 else { 5097 setup_buf->num_scsi_subq_channels = cpu_to_be32(num_channels); 5098 for (i = 0; i < num_channels; i++) 5099 setup_buf->channel_handles[i] = cpu_to_be64(scrqs->scrqs[i].cookie); 5100 } 5101 5102 ibmvfc_init_event(evt, ibmvfc_channel_setup_done, IBMVFC_MAD_FORMAT); 5103 mad = &evt->iu.channel_setup; 5104 memset(mad, 0, sizeof(*mad)); 5105 mad->common.version = cpu_to_be32(1); 5106 mad->common.opcode = cpu_to_be32(IBMVFC_CHANNEL_SETUP); 5107 mad->common.length = cpu_to_be16(sizeof(*mad)); 5108 mad->buffer.va = cpu_to_be64(vhost->channel_setup_dma); 5109 mad->buffer.len = cpu_to_be32(sizeof(*vhost->channel_setup_buf)); 5110 5111 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT); 5112 5113 if (!ibmvfc_send_event(evt, vhost, default_timeout)) 5114 ibmvfc_dbg(vhost, "Sent channel setup\n"); 5115 else 5116 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN); 5117 } 5118 5119 static void ibmvfc_channel_enquiry_done(struct ibmvfc_event *evt) 5120 { 5121 struct ibmvfc_host *vhost = evt->vhost; 5122 struct ibmvfc_channel_enquiry *rsp = &evt->xfer_iu->channel_enquiry; 5123 u32 mad_status = be16_to_cpu(rsp->common.status); 5124 int level = IBMVFC_DEFAULT_LOG_LEVEL; 5125 5126 switch (mad_status) { 5127 case IBMVFC_MAD_SUCCESS: 5128 ibmvfc_dbg(vhost, "Channel Enquiry succeeded\n"); 5129 vhost->max_vios_scsi_channels = be32_to_cpu(rsp->num_scsi_subq_channels); 5130 ibmvfc_free_event(evt); 5131 break; 5132 case IBMVFC_MAD_FAILED: 5133 level += ibmvfc_retry_host_init(vhost); 5134 ibmvfc_log(vhost, level, "Channel Enquiry failed\n"); 5135 fallthrough; 5136 case IBMVFC_MAD_DRIVER_FAILED: 5137 ibmvfc_free_event(evt); 5138 return; 5139 default: 5140 dev_err(vhost->dev, "Invalid Channel Enquiry response: 0x%x\n", 5141 mad_status); 5142 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 5143 ibmvfc_free_event(evt); 5144 return; 5145 } 5146 5147 ibmvfc_channel_setup(vhost); 5148 } 5149 5150 static void ibmvfc_channel_enquiry(struct ibmvfc_host *vhost) 5151 { 5152 struct ibmvfc_channel_enquiry *mad; 5153 struct ibmvfc_event *evt = ibmvfc_get_reserved_event(&vhost->crq); 5154 int level = IBMVFC_DEFAULT_LOG_LEVEL; 5155 5156 if (!evt) { 5157 ibmvfc_log(vhost, level, "Channel Enquiry failed: no available events\n"); 5158 ibmvfc_hard_reset_host(vhost); 5159 return; 5160 } 5161 5162 ibmvfc_init_event(evt, ibmvfc_channel_enquiry_done, IBMVFC_MAD_FORMAT); 5163 mad = &evt->iu.channel_enquiry; 5164 memset(mad, 0, sizeof(*mad)); 5165 mad->common.version = cpu_to_be32(1); 5166 mad->common.opcode = cpu_to_be32(IBMVFC_CHANNEL_ENQUIRY); 5167 mad->common.length = cpu_to_be16(sizeof(*mad)); 5168 5169 if (mig_channels_only) 5170 mad->flags |= cpu_to_be32(IBMVFC_NO_CHANNELS_TO_CRQ_SUPPORT); 5171 if (mig_no_less_channels) 5172 mad->flags |= cpu_to_be32(IBMVFC_NO_N_TO_M_CHANNELS_SUPPORT); 5173 5174 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT); 5175 5176 if (!ibmvfc_send_event(evt, vhost, default_timeout)) 5177 ibmvfc_dbg(vhost, "Send channel enquiry\n"); 5178 else 5179 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 5180 } 5181 5182 /** 5183 * ibmvfc_npiv_login_done - Completion handler for NPIV Login 5184 * @evt: ibmvfc event struct 5185 * 5186 **/ 5187 static void ibmvfc_npiv_login_done(struct ibmvfc_event *evt) 5188 { 5189 struct ibmvfc_host *vhost = evt->vhost; 5190 u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_login.common.status); 5191 struct ibmvfc_npiv_login_resp *rsp = &vhost->login_buf->resp; 5192 unsigned int npiv_max_sectors; 5193 int level = IBMVFC_DEFAULT_LOG_LEVEL; 5194 5195 switch (mad_status) { 5196 case IBMVFC_MAD_SUCCESS: 5197 ibmvfc_free_event(evt); 5198 break; 5199 case IBMVFC_MAD_FAILED: 5200 if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error))) 5201 level += ibmvfc_retry_host_init(vhost); 5202 else 5203 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 5204 ibmvfc_log(vhost, level, "NPIV Login failed: %s (%x:%x)\n", 5205 ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)), 5206 be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)); 5207 ibmvfc_free_event(evt); 5208 return; 5209 case IBMVFC_MAD_CRQ_ERROR: 5210 ibmvfc_retry_host_init(vhost); 5211 fallthrough; 5212 case IBMVFC_MAD_DRIVER_FAILED: 5213 ibmvfc_free_event(evt); 5214 return; 5215 default: 5216 dev_err(vhost->dev, "Invalid NPIV Login response: 0x%x\n", mad_status); 5217 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 5218 ibmvfc_free_event(evt); 5219 return; 5220 } 5221 5222 vhost->client_migrated = 0; 5223 5224 if (!(be32_to_cpu(rsp->flags) & IBMVFC_NATIVE_FC)) { 5225 dev_err(vhost->dev, "Virtual adapter does not support FC. %x\n", 5226 rsp->flags); 5227 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 5228 wake_up(&vhost->work_wait_q); 5229 return; 5230 } 5231 5232 if (be32_to_cpu(rsp->max_cmds) <= IBMVFC_NUM_INTERNAL_REQ) { 5233 dev_err(vhost->dev, "Virtual adapter supported queue depth too small: %d\n", 5234 rsp->max_cmds); 5235 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 5236 wake_up(&vhost->work_wait_q); 5237 return; 5238 } 5239 5240 vhost->logged_in = 1; 5241 npiv_max_sectors = min((uint)(be64_to_cpu(rsp->max_dma_len) >> 9), max_sectors); 5242 dev_info(vhost->dev, "Host partition: %s, device: %s %s %s max sectors %u\n", 5243 rsp->partition_name, rsp->device_name, rsp->port_loc_code, 5244 rsp->drc_name, npiv_max_sectors); 5245 5246 fc_host_fabric_name(vhost->host) = be64_to_cpu(rsp->node_name); 5247 fc_host_node_name(vhost->host) = be64_to_cpu(rsp->node_name); 5248 fc_host_port_name(vhost->host) = be64_to_cpu(rsp->port_name); 5249 fc_host_port_id(vhost->host) = be64_to_cpu(rsp->scsi_id); 5250 fc_host_port_type(vhost->host) = FC_PORTTYPE_NPIV; 5251 fc_host_supported_classes(vhost->host) = 0; 5252 if (be32_to_cpu(rsp->service_parms.class1_parms[0]) & 0x80000000) 5253 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS1; 5254 if (be32_to_cpu(rsp->service_parms.class2_parms[0]) & 0x80000000) 5255 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS2; 5256 if (be32_to_cpu(rsp->service_parms.class3_parms[0]) & 0x80000000) 5257 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS3; 5258 fc_host_maxframe_size(vhost->host) = 5259 be16_to_cpu(rsp->service_parms.common.bb_rcv_sz) & 0x0fff; 5260 5261 vhost->host->can_queue = be32_to_cpu(rsp->max_cmds) - IBMVFC_NUM_INTERNAL_REQ; 5262 vhost->host->max_sectors = npiv_max_sectors; 5263 5264 if (ibmvfc_check_caps(vhost, IBMVFC_CAN_SUPPORT_CHANNELS) && vhost->do_enquiry) { 5265 ibmvfc_channel_enquiry(vhost); 5266 } else { 5267 vhost->do_enquiry = 0; 5268 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY); 5269 wake_up(&vhost->work_wait_q); 5270 } 5271 } 5272 5273 /** 5274 * ibmvfc_npiv_login - Sends NPIV login 5275 * @vhost: ibmvfc host struct 5276 * 5277 **/ 5278 static void ibmvfc_npiv_login(struct ibmvfc_host *vhost) 5279 { 5280 struct ibmvfc_npiv_login_mad *mad; 5281 struct ibmvfc_event *evt = ibmvfc_get_reserved_event(&vhost->crq); 5282 5283 if (!evt) { 5284 ibmvfc_dbg(vhost, "NPIV Login failed: no available events\n"); 5285 ibmvfc_hard_reset_host(vhost); 5286 return; 5287 } 5288 5289 ibmvfc_gather_partition_info(vhost); 5290 ibmvfc_set_login_info(vhost); 5291 ibmvfc_init_event(evt, ibmvfc_npiv_login_done, IBMVFC_MAD_FORMAT); 5292 5293 memcpy(vhost->login_buf, &vhost->login_info, sizeof(vhost->login_info)); 5294 mad = &evt->iu.npiv_login; 5295 memset(mad, 0, sizeof(struct ibmvfc_npiv_login_mad)); 5296 mad->common.version = cpu_to_be32(1); 5297 mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGIN); 5298 mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_login_mad)); 5299 mad->buffer.va = cpu_to_be64(vhost->login_buf_dma); 5300 mad->buffer.len = cpu_to_be32(sizeof(*vhost->login_buf)); 5301 5302 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT); 5303 5304 if (!ibmvfc_send_event(evt, vhost, default_timeout)) 5305 ibmvfc_dbg(vhost, "Sent NPIV login\n"); 5306 else 5307 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 5308 } 5309 5310 /** 5311 * ibmvfc_npiv_logout_done - Completion handler for NPIV Logout 5312 * @evt: ibmvfc event struct 5313 * 5314 **/ 5315 static void ibmvfc_npiv_logout_done(struct ibmvfc_event *evt) 5316 { 5317 struct ibmvfc_host *vhost = evt->vhost; 5318 u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_logout.common.status); 5319 5320 ibmvfc_free_event(evt); 5321 5322 switch (mad_status) { 5323 case IBMVFC_MAD_SUCCESS: 5324 if (list_empty(&vhost->crq.sent) && 5325 vhost->action == IBMVFC_HOST_ACTION_LOGO_WAIT) { 5326 ibmvfc_init_host(vhost); 5327 return; 5328 } 5329 break; 5330 case IBMVFC_MAD_FAILED: 5331 case IBMVFC_MAD_NOT_SUPPORTED: 5332 case IBMVFC_MAD_CRQ_ERROR: 5333 case IBMVFC_MAD_DRIVER_FAILED: 5334 default: 5335 ibmvfc_dbg(vhost, "NPIV Logout failed. 0x%X\n", mad_status); 5336 break; 5337 } 5338 5339 ibmvfc_hard_reset_host(vhost); 5340 } 5341 5342 /** 5343 * ibmvfc_npiv_logout - Issue an NPIV Logout 5344 * @vhost: ibmvfc host struct 5345 * 5346 **/ 5347 static void ibmvfc_npiv_logout(struct ibmvfc_host *vhost) 5348 { 5349 struct ibmvfc_npiv_logout_mad *mad; 5350 struct ibmvfc_event *evt; 5351 5352 evt = ibmvfc_get_reserved_event(&vhost->crq); 5353 if (!evt) { 5354 ibmvfc_dbg(vhost, "NPIV Logout failed: no available events\n"); 5355 ibmvfc_hard_reset_host(vhost); 5356 return; 5357 } 5358 5359 ibmvfc_init_event(evt, ibmvfc_npiv_logout_done, IBMVFC_MAD_FORMAT); 5360 5361 mad = &evt->iu.npiv_logout; 5362 memset(mad, 0, sizeof(*mad)); 5363 mad->common.version = cpu_to_be32(1); 5364 mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGOUT); 5365 mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_logout_mad)); 5366 5367 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO_WAIT); 5368 5369 if (!ibmvfc_send_event(evt, vhost, default_timeout)) 5370 ibmvfc_dbg(vhost, "Sent NPIV logout\n"); 5371 else 5372 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 5373 } 5374 5375 /** 5376 * ibmvfc_dev_init_to_do - Is there target initialization work to do? 5377 * @vhost: ibmvfc host struct 5378 * 5379 * Returns: 5380 * 1 if work to do / 0 if not 5381 **/ 5382 static int ibmvfc_dev_init_to_do(struct ibmvfc_host *vhost) 5383 { 5384 struct ibmvfc_target *tgt; 5385 5386 list_for_each_entry(tgt, &vhost->targets, queue) { 5387 if (tgt->action == IBMVFC_TGT_ACTION_INIT || 5388 tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT) 5389 return 1; 5390 } 5391 5392 return 0; 5393 } 5394 5395 /** 5396 * ibmvfc_dev_logo_to_do - Is there target logout work to do? 5397 * @vhost: ibmvfc host struct 5398 * 5399 * Returns: 5400 * 1 if work to do / 0 if not 5401 **/ 5402 static int ibmvfc_dev_logo_to_do(struct ibmvfc_host *vhost) 5403 { 5404 struct ibmvfc_target *tgt; 5405 5406 list_for_each_entry(tgt, &vhost->targets, queue) { 5407 if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT || 5408 tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT) 5409 return 1; 5410 } 5411 return 0; 5412 } 5413 5414 /** 5415 * __ibmvfc_work_to_do - Is there task level work to do? (no locking) 5416 * @vhost: ibmvfc host struct 5417 * 5418 * Returns: 5419 * 1 if work to do / 0 if not 5420 **/ 5421 static int __ibmvfc_work_to_do(struct ibmvfc_host *vhost) 5422 { 5423 struct ibmvfc_target *tgt; 5424 5425 if (kthread_should_stop()) 5426 return 1; 5427 switch (vhost->action) { 5428 case IBMVFC_HOST_ACTION_NONE: 5429 case IBMVFC_HOST_ACTION_INIT_WAIT: 5430 case IBMVFC_HOST_ACTION_LOGO_WAIT: 5431 return 0; 5432 case IBMVFC_HOST_ACTION_TGT_INIT: 5433 case IBMVFC_HOST_ACTION_QUERY_TGTS: 5434 if (vhost->discovery_threads == disc_threads) 5435 return 0; 5436 list_for_each_entry(tgt, &vhost->targets, queue) 5437 if (tgt->action == IBMVFC_TGT_ACTION_INIT) 5438 return 1; 5439 list_for_each_entry(tgt, &vhost->targets, queue) 5440 if (tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT) 5441 return 0; 5442 return 1; 5443 case IBMVFC_HOST_ACTION_TGT_DEL: 5444 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED: 5445 if (vhost->discovery_threads == disc_threads) 5446 return 0; 5447 list_for_each_entry(tgt, &vhost->targets, queue) 5448 if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT) 5449 return 1; 5450 list_for_each_entry(tgt, &vhost->targets, queue) 5451 if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT) 5452 return 0; 5453 return 1; 5454 case IBMVFC_HOST_ACTION_LOGO: 5455 case IBMVFC_HOST_ACTION_INIT: 5456 case IBMVFC_HOST_ACTION_ALLOC_TGTS: 5457 case IBMVFC_HOST_ACTION_QUERY: 5458 case IBMVFC_HOST_ACTION_RESET: 5459 case IBMVFC_HOST_ACTION_REENABLE: 5460 default: 5461 break; 5462 } 5463 5464 return 1; 5465 } 5466 5467 /** 5468 * ibmvfc_work_to_do - Is there task level work to do? 5469 * @vhost: ibmvfc host struct 5470 * 5471 * Returns: 5472 * 1 if work to do / 0 if not 5473 **/ 5474 static int ibmvfc_work_to_do(struct ibmvfc_host *vhost) 5475 { 5476 unsigned long flags; 5477 int rc; 5478 5479 spin_lock_irqsave(vhost->host->host_lock, flags); 5480 rc = __ibmvfc_work_to_do(vhost); 5481 spin_unlock_irqrestore(vhost->host->host_lock, flags); 5482 return rc; 5483 } 5484 5485 /** 5486 * ibmvfc_log_ae - Log async events if necessary 5487 * @vhost: ibmvfc host struct 5488 * @events: events to log 5489 * 5490 **/ 5491 static void ibmvfc_log_ae(struct ibmvfc_host *vhost, int events) 5492 { 5493 if (events & IBMVFC_AE_RSCN) 5494 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_RSCN, 0); 5495 if ((events & IBMVFC_AE_LINKDOWN) && 5496 vhost->state >= IBMVFC_HALTED) 5497 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKDOWN, 0); 5498 if ((events & IBMVFC_AE_LINKUP) && 5499 vhost->state == IBMVFC_INITIALIZING) 5500 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKUP, 0); 5501 } 5502 5503 /** 5504 * ibmvfc_tgt_add_rport - Tell the FC transport about a new remote port 5505 * @tgt: ibmvfc target struct 5506 * 5507 **/ 5508 static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt) 5509 { 5510 struct ibmvfc_host *vhost = tgt->vhost; 5511 struct fc_rport *rport; 5512 unsigned long flags; 5513 5514 tgt_dbg(tgt, "Adding rport\n"); 5515 rport = fc_remote_port_add(vhost->host, 0, &tgt->ids); 5516 spin_lock_irqsave(vhost->host->host_lock, flags); 5517 5518 if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) { 5519 tgt_dbg(tgt, "Deleting rport\n"); 5520 list_del(&tgt->queue); 5521 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT); 5522 spin_unlock_irqrestore(vhost->host->host_lock, flags); 5523 fc_remote_port_delete(rport); 5524 timer_delete_sync(&tgt->timer); 5525 kref_put(&tgt->kref, ibmvfc_release_tgt); 5526 return; 5527 } else if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT) { 5528 tgt_dbg(tgt, "Deleting rport with outstanding I/O\n"); 5529 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT); 5530 tgt->rport = NULL; 5531 tgt->init_retries = 0; 5532 spin_unlock_irqrestore(vhost->host->host_lock, flags); 5533 fc_remote_port_delete(rport); 5534 return; 5535 } else if (rport && tgt->action == IBMVFC_TGT_ACTION_DELETED_RPORT) { 5536 spin_unlock_irqrestore(vhost->host->host_lock, flags); 5537 return; 5538 } 5539 5540 if (rport) { 5541 tgt_dbg(tgt, "rport add succeeded\n"); 5542 tgt->rport = rport; 5543 rport->maxframe_size = be16_to_cpu(tgt->service_parms.common.bb_rcv_sz) & 0x0fff; 5544 rport->supported_classes = 0; 5545 tgt->target_id = rport->scsi_target_id; 5546 if (be32_to_cpu(tgt->service_parms.class1_parms[0]) & 0x80000000) 5547 rport->supported_classes |= FC_COS_CLASS1; 5548 if (be32_to_cpu(tgt->service_parms.class2_parms[0]) & 0x80000000) 5549 rport->supported_classes |= FC_COS_CLASS2; 5550 if (be32_to_cpu(tgt->service_parms.class3_parms[0]) & 0x80000000) 5551 rport->supported_classes |= FC_COS_CLASS3; 5552 } else 5553 tgt_dbg(tgt, "rport add failed\n"); 5554 spin_unlock_irqrestore(vhost->host->host_lock, flags); 5555 } 5556 5557 /** 5558 * ibmvfc_do_work - Do task level work 5559 * @vhost: ibmvfc host struct 5560 * 5561 **/ 5562 static void ibmvfc_do_work(struct ibmvfc_host *vhost) 5563 { 5564 struct ibmvfc_target *tgt; 5565 unsigned long flags; 5566 struct fc_rport *rport; 5567 LIST_HEAD(purge); 5568 int rc; 5569 5570 ibmvfc_log_ae(vhost, vhost->events_to_log); 5571 spin_lock_irqsave(vhost->host->host_lock, flags); 5572 vhost->events_to_log = 0; 5573 switch (vhost->action) { 5574 case IBMVFC_HOST_ACTION_NONE: 5575 case IBMVFC_HOST_ACTION_LOGO_WAIT: 5576 case IBMVFC_HOST_ACTION_INIT_WAIT: 5577 break; 5578 case IBMVFC_HOST_ACTION_RESET: 5579 list_splice_init(&vhost->purge, &purge); 5580 spin_unlock_irqrestore(vhost->host->host_lock, flags); 5581 ibmvfc_complete_purge(&purge); 5582 rc = ibmvfc_reset_crq(vhost); 5583 5584 spin_lock_irqsave(vhost->host->host_lock, flags); 5585 if (!rc || rc == H_CLOSED) 5586 vio_enable_interrupts(to_vio_dev(vhost->dev)); 5587 if (vhost->action == IBMVFC_HOST_ACTION_RESET) { 5588 /* 5589 * The only action we could have changed to would have 5590 * been reenable, in which case, we skip the rest of 5591 * this path and wait until we've done the re-enable 5592 * before sending the crq init. 5593 */ 5594 vhost->action = IBMVFC_HOST_ACTION_TGT_DEL; 5595 5596 if (rc || (rc = ibmvfc_send_crq_init(vhost)) || 5597 (rc = vio_enable_interrupts(to_vio_dev(vhost->dev)))) { 5598 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 5599 dev_err(vhost->dev, "Error after reset (rc=%d)\n", rc); 5600 } 5601 } 5602 break; 5603 case IBMVFC_HOST_ACTION_REENABLE: 5604 list_splice_init(&vhost->purge, &purge); 5605 spin_unlock_irqrestore(vhost->host->host_lock, flags); 5606 ibmvfc_complete_purge(&purge); 5607 rc = ibmvfc_reenable_crq_queue(vhost); 5608 5609 spin_lock_irqsave(vhost->host->host_lock, flags); 5610 if (vhost->action == IBMVFC_HOST_ACTION_REENABLE) { 5611 /* 5612 * The only action we could have changed to would have 5613 * been reset, in which case, we skip the rest of this 5614 * path and wait until we've done the reset before 5615 * sending the crq init. 5616 */ 5617 vhost->action = IBMVFC_HOST_ACTION_TGT_DEL; 5618 if (rc || (rc = ibmvfc_send_crq_init(vhost))) { 5619 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 5620 dev_err(vhost->dev, "Error after enable (rc=%d)\n", rc); 5621 } 5622 } 5623 break; 5624 case IBMVFC_HOST_ACTION_LOGO: 5625 vhost->job_step(vhost); 5626 break; 5627 case IBMVFC_HOST_ACTION_INIT: 5628 BUG_ON(vhost->state != IBMVFC_INITIALIZING); 5629 if (vhost->delay_init) { 5630 vhost->delay_init = 0; 5631 spin_unlock_irqrestore(vhost->host->host_lock, flags); 5632 ssleep(15); 5633 return; 5634 } else 5635 vhost->job_step(vhost); 5636 break; 5637 case IBMVFC_HOST_ACTION_QUERY: 5638 list_for_each_entry(tgt, &vhost->targets, queue) 5639 ibmvfc_init_tgt(tgt, ibmvfc_tgt_query_target); 5640 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY_TGTS); 5641 break; 5642 case IBMVFC_HOST_ACTION_QUERY_TGTS: 5643 list_for_each_entry(tgt, &vhost->targets, queue) { 5644 if (tgt->action == IBMVFC_TGT_ACTION_INIT) { 5645 tgt->job_step(tgt); 5646 break; 5647 } 5648 } 5649 5650 if (!ibmvfc_dev_init_to_do(vhost)) 5651 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL); 5652 break; 5653 case IBMVFC_HOST_ACTION_TGT_DEL: 5654 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED: 5655 list_for_each_entry(tgt, &vhost->targets, queue) { 5656 if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT) { 5657 tgt->job_step(tgt); 5658 break; 5659 } 5660 } 5661 5662 if (ibmvfc_dev_logo_to_do(vhost)) { 5663 spin_unlock_irqrestore(vhost->host->host_lock, flags); 5664 return; 5665 } 5666 5667 list_for_each_entry(tgt, &vhost->targets, queue) { 5668 if (tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) { 5669 tgt_dbg(tgt, "Deleting rport\n"); 5670 rport = tgt->rport; 5671 tgt->rport = NULL; 5672 list_del(&tgt->queue); 5673 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT); 5674 spin_unlock_irqrestore(vhost->host->host_lock, flags); 5675 if (rport) 5676 fc_remote_port_delete(rport); 5677 timer_delete_sync(&tgt->timer); 5678 kref_put(&tgt->kref, ibmvfc_release_tgt); 5679 return; 5680 } else if (tgt->action == IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT) { 5681 tgt_dbg(tgt, "Deleting rport with I/O outstanding\n"); 5682 rport = tgt->rport; 5683 tgt->rport = NULL; 5684 tgt->init_retries = 0; 5685 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT); 5686 5687 /* 5688 * If fast fail is enabled, we wait for it to fire and then clean up 5689 * the old port, since we expect the fast fail timer to clean up the 5690 * outstanding I/O faster than waiting for normal command timeouts. 5691 * However, if fast fail is disabled, any I/O outstanding to the 5692 * rport LUNs will stay outstanding indefinitely, since the EH handlers 5693 * won't get invoked for I/O's timing out. If this is a NPIV failover 5694 * scenario, the better alternative is to use the move login. 5695 */ 5696 if (rport && rport->fast_io_fail_tmo == -1) 5697 tgt->move_login = 1; 5698 spin_unlock_irqrestore(vhost->host->host_lock, flags); 5699 if (rport) 5700 fc_remote_port_delete(rport); 5701 return; 5702 } 5703 } 5704 5705 if (vhost->state == IBMVFC_INITIALIZING) { 5706 if (vhost->action == IBMVFC_HOST_ACTION_TGT_DEL_FAILED) { 5707 if (vhost->reinit) { 5708 vhost->reinit = 0; 5709 scsi_block_requests(vhost->host); 5710 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY); 5711 spin_unlock_irqrestore(vhost->host->host_lock, flags); 5712 } else { 5713 ibmvfc_set_host_state(vhost, IBMVFC_ACTIVE); 5714 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE); 5715 wake_up(&vhost->init_wait_q); 5716 schedule_work(&vhost->rport_add_work_q); 5717 vhost->init_retries = 0; 5718 spin_unlock_irqrestore(vhost->host->host_lock, flags); 5719 scsi_unblock_requests(vhost->host); 5720 } 5721 5722 return; 5723 } else { 5724 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT); 5725 vhost->job_step = ibmvfc_discover_targets; 5726 } 5727 } else { 5728 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE); 5729 spin_unlock_irqrestore(vhost->host->host_lock, flags); 5730 scsi_unblock_requests(vhost->host); 5731 wake_up(&vhost->init_wait_q); 5732 return; 5733 } 5734 break; 5735 case IBMVFC_HOST_ACTION_ALLOC_TGTS: 5736 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_INIT); 5737 spin_unlock_irqrestore(vhost->host->host_lock, flags); 5738 ibmvfc_alloc_targets(vhost); 5739 spin_lock_irqsave(vhost->host->host_lock, flags); 5740 break; 5741 case IBMVFC_HOST_ACTION_TGT_INIT: 5742 list_for_each_entry(tgt, &vhost->targets, queue) { 5743 if (tgt->action == IBMVFC_TGT_ACTION_INIT) { 5744 tgt->job_step(tgt); 5745 break; 5746 } 5747 } 5748 5749 if (!ibmvfc_dev_init_to_do(vhost)) 5750 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL_FAILED); 5751 break; 5752 default: 5753 break; 5754 } 5755 5756 spin_unlock_irqrestore(vhost->host->host_lock, flags); 5757 } 5758 5759 /** 5760 * ibmvfc_work - Do task level work 5761 * @data: ibmvfc host struct 5762 * 5763 * Returns: 5764 * zero 5765 **/ 5766 static int ibmvfc_work(void *data) 5767 { 5768 struct ibmvfc_host *vhost = data; 5769 int rc; 5770 5771 set_user_nice(current, MIN_NICE); 5772 5773 while (1) { 5774 rc = wait_event_interruptible(vhost->work_wait_q, 5775 ibmvfc_work_to_do(vhost)); 5776 5777 BUG_ON(rc); 5778 5779 if (kthread_should_stop()) 5780 break; 5781 5782 ibmvfc_do_work(vhost); 5783 } 5784 5785 ibmvfc_dbg(vhost, "ibmvfc kthread exiting...\n"); 5786 return 0; 5787 } 5788 5789 /** 5790 * ibmvfc_alloc_queue - Allocate queue 5791 * @vhost: ibmvfc host struct 5792 * @queue: ibmvfc queue to allocate 5793 * @fmt: queue format to allocate 5794 * 5795 * Returns: 5796 * 0 on success / non-zero on failure 5797 **/ 5798 static int ibmvfc_alloc_queue(struct ibmvfc_host *vhost, 5799 struct ibmvfc_queue *queue, 5800 enum ibmvfc_msg_fmt fmt) 5801 { 5802 struct device *dev = vhost->dev; 5803 size_t fmt_size; 5804 5805 ENTER; 5806 spin_lock_init(&queue->_lock); 5807 queue->q_lock = &queue->_lock; 5808 5809 switch (fmt) { 5810 case IBMVFC_CRQ_FMT: 5811 fmt_size = sizeof(*queue->msgs.crq); 5812 queue->total_depth = scsi_qdepth + IBMVFC_NUM_INTERNAL_REQ; 5813 queue->evt_depth = scsi_qdepth; 5814 queue->reserved_depth = IBMVFC_NUM_INTERNAL_REQ; 5815 break; 5816 case IBMVFC_ASYNC_FMT: 5817 fmt_size = sizeof(*queue->msgs.async); 5818 break; 5819 case IBMVFC_SUB_CRQ_FMT: 5820 fmt_size = sizeof(*queue->msgs.scrq); 5821 /* We need one extra event for Cancel Commands */ 5822 queue->total_depth = scsi_qdepth + IBMVFC_NUM_INTERNAL_SUBQ_REQ; 5823 queue->evt_depth = scsi_qdepth; 5824 queue->reserved_depth = IBMVFC_NUM_INTERNAL_SUBQ_REQ; 5825 break; 5826 default: 5827 dev_warn(dev, "Unknown command/response queue message format: %d\n", fmt); 5828 return -EINVAL; 5829 } 5830 5831 queue->fmt = fmt; 5832 if (ibmvfc_init_event_pool(vhost, queue)) { 5833 dev_err(dev, "Couldn't initialize event pool.\n"); 5834 return -ENOMEM; 5835 } 5836 5837 queue->msgs.handle = (void *)get_zeroed_page(GFP_KERNEL); 5838 if (!queue->msgs.handle) 5839 return -ENOMEM; 5840 5841 queue->msg_token = dma_map_single(dev, queue->msgs.handle, PAGE_SIZE, 5842 DMA_BIDIRECTIONAL); 5843 5844 if (dma_mapping_error(dev, queue->msg_token)) { 5845 free_page((unsigned long)queue->msgs.handle); 5846 queue->msgs.handle = NULL; 5847 return -ENOMEM; 5848 } 5849 5850 queue->cur = 0; 5851 queue->size = PAGE_SIZE / fmt_size; 5852 5853 queue->vhost = vhost; 5854 return 0; 5855 } 5856 5857 /** 5858 * ibmvfc_init_crq - Initializes and registers CRQ with hypervisor 5859 * @vhost: ibmvfc host struct 5860 * 5861 * Allocates a page for messages, maps it for dma, and registers 5862 * the crq with the hypervisor. 5863 * 5864 * Return value: 5865 * zero on success / other on failure 5866 **/ 5867 static int ibmvfc_init_crq(struct ibmvfc_host *vhost) 5868 { 5869 int rc, retrc = -ENOMEM; 5870 struct device *dev = vhost->dev; 5871 struct vio_dev *vdev = to_vio_dev(dev); 5872 struct ibmvfc_queue *crq = &vhost->crq; 5873 5874 ENTER; 5875 if (ibmvfc_alloc_queue(vhost, crq, IBMVFC_CRQ_FMT)) 5876 return -ENOMEM; 5877 5878 retrc = rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address, 5879 crq->msg_token, PAGE_SIZE); 5880 5881 if (rc == H_RESOURCE) 5882 /* maybe kexecing and resource is busy. try a reset */ 5883 retrc = rc = ibmvfc_reset_crq(vhost); 5884 5885 if (rc == H_CLOSED) 5886 dev_warn(dev, "Partner adapter not ready\n"); 5887 else if (rc) { 5888 dev_warn(dev, "Error %d opening adapter\n", rc); 5889 goto reg_crq_failed; 5890 } 5891 5892 retrc = 0; 5893 5894 tasklet_init(&vhost->tasklet, (void *)ibmvfc_tasklet, (unsigned long)vhost); 5895 5896 if ((rc = request_irq(vdev->irq, ibmvfc_interrupt, 0, IBMVFC_NAME, vhost))) { 5897 dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n", vdev->irq, rc); 5898 goto req_irq_failed; 5899 } 5900 5901 if ((rc = vio_enable_interrupts(vdev))) { 5902 dev_err(dev, "Error %d enabling interrupts\n", rc); 5903 goto req_irq_failed; 5904 } 5905 5906 LEAVE; 5907 return retrc; 5908 5909 req_irq_failed: 5910 tasklet_kill(&vhost->tasklet); 5911 do { 5912 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); 5913 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc)); 5914 reg_crq_failed: 5915 ibmvfc_free_queue(vhost, crq); 5916 return retrc; 5917 } 5918 5919 static int ibmvfc_register_channel(struct ibmvfc_host *vhost, 5920 struct ibmvfc_channels *channels, 5921 int index) 5922 { 5923 struct device *dev = vhost->dev; 5924 struct vio_dev *vdev = to_vio_dev(dev); 5925 struct ibmvfc_queue *scrq = &channels->scrqs[index]; 5926 int rc = -ENOMEM; 5927 5928 ENTER; 5929 5930 rc = h_reg_sub_crq(vdev->unit_address, scrq->msg_token, PAGE_SIZE, 5931 &scrq->cookie, &scrq->hw_irq); 5932 5933 /* H_CLOSED indicates successful register, but no CRQ partner */ 5934 if (rc && rc != H_CLOSED) { 5935 dev_warn(dev, "Error registering sub-crq: %d\n", rc); 5936 if (rc == H_PARAMETER) 5937 dev_warn_once(dev, "Firmware may not support MQ\n"); 5938 goto reg_failed; 5939 } 5940 5941 scrq->irq = irq_create_mapping(NULL, scrq->hw_irq); 5942 5943 if (!scrq->irq) { 5944 rc = -EINVAL; 5945 dev_err(dev, "Error mapping sub-crq[%d] irq\n", index); 5946 goto irq_failed; 5947 } 5948 5949 switch (channels->protocol) { 5950 case IBMVFC_PROTO_SCSI: 5951 snprintf(scrq->name, sizeof(scrq->name), "ibmvfc-%x-scsi%d", 5952 vdev->unit_address, index); 5953 scrq->handler = ibmvfc_interrupt_mq; 5954 break; 5955 case IBMVFC_PROTO_NVME: 5956 snprintf(scrq->name, sizeof(scrq->name), "ibmvfc-%x-nvmf%d", 5957 vdev->unit_address, index); 5958 scrq->handler = ibmvfc_interrupt_mq; 5959 break; 5960 default: 5961 dev_err(dev, "Unknown channel protocol (%d)\n", 5962 channels->protocol); 5963 goto irq_failed; 5964 } 5965 5966 rc = request_irq(scrq->irq, scrq->handler, 0, scrq->name, scrq); 5967 5968 if (rc) { 5969 dev_err(dev, "Couldn't register sub-crq[%d] irq\n", index); 5970 irq_dispose_mapping(scrq->irq); 5971 goto irq_failed; 5972 } 5973 5974 scrq->hwq_id = index; 5975 5976 LEAVE; 5977 return 0; 5978 5979 irq_failed: 5980 do { 5981 rc = plpar_hcall_norets(H_FREE_SUB_CRQ, vdev->unit_address, scrq->cookie); 5982 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc)); 5983 reg_failed: 5984 LEAVE; 5985 return rc; 5986 } 5987 5988 static void ibmvfc_deregister_channel(struct ibmvfc_host *vhost, 5989 struct ibmvfc_channels *channels, 5990 int index) 5991 { 5992 struct device *dev = vhost->dev; 5993 struct vio_dev *vdev = to_vio_dev(dev); 5994 struct ibmvfc_queue *scrq = &channels->scrqs[index]; 5995 long rc; 5996 5997 ENTER; 5998 5999 free_irq(scrq->irq, scrq); 6000 irq_dispose_mapping(scrq->irq); 6001 scrq->irq = 0; 6002 6003 do { 6004 rc = plpar_hcall_norets(H_FREE_SUB_CRQ, vdev->unit_address, 6005 scrq->cookie); 6006 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc)); 6007 6008 if (rc) 6009 dev_err(dev, "Failed to free sub-crq[%d]: rc=%ld\n", index, rc); 6010 6011 /* Clean out the queue */ 6012 memset(scrq->msgs.crq, 0, PAGE_SIZE); 6013 scrq->cur = 0; 6014 6015 LEAVE; 6016 } 6017 6018 static void ibmvfc_reg_sub_crqs(struct ibmvfc_host *vhost, 6019 struct ibmvfc_channels *channels) 6020 { 6021 int i, j; 6022 6023 ENTER; 6024 if (!vhost->mq_enabled || !channels->scrqs) 6025 return; 6026 6027 for (i = 0; i < channels->max_queues; i++) { 6028 if (ibmvfc_register_channel(vhost, channels, i)) { 6029 for (j = i; j > 0; j--) 6030 ibmvfc_deregister_channel(vhost, channels, j - 1); 6031 vhost->do_enquiry = 0; 6032 return; 6033 } 6034 } 6035 6036 LEAVE; 6037 } 6038 6039 static void ibmvfc_dereg_sub_crqs(struct ibmvfc_host *vhost, 6040 struct ibmvfc_channels *channels) 6041 { 6042 int i; 6043 6044 ENTER; 6045 if (!vhost->mq_enabled || !channels->scrqs) 6046 return; 6047 6048 for (i = 0; i < channels->max_queues; i++) 6049 ibmvfc_deregister_channel(vhost, channels, i); 6050 6051 LEAVE; 6052 } 6053 6054 static int ibmvfc_alloc_channels(struct ibmvfc_host *vhost, 6055 struct ibmvfc_channels *channels) 6056 { 6057 struct ibmvfc_queue *scrq; 6058 int i, j; 6059 int rc = 0; 6060 6061 channels->scrqs = kzalloc_objs(*channels->scrqs, channels->max_queues); 6062 if (!channels->scrqs) 6063 return -ENOMEM; 6064 6065 for (i = 0; i < channels->max_queues; i++) { 6066 scrq = &channels->scrqs[i]; 6067 rc = ibmvfc_alloc_queue(vhost, scrq, IBMVFC_SUB_CRQ_FMT); 6068 if (rc) { 6069 for (j = i; j > 0; j--) { 6070 scrq = &channels->scrqs[j - 1]; 6071 ibmvfc_free_queue(vhost, scrq); 6072 } 6073 kfree(channels->scrqs); 6074 channels->scrqs = NULL; 6075 channels->active_queues = 0; 6076 return rc; 6077 } 6078 } 6079 6080 return rc; 6081 } 6082 6083 static void ibmvfc_init_sub_crqs(struct ibmvfc_host *vhost) 6084 { 6085 ENTER; 6086 if (!vhost->mq_enabled) 6087 return; 6088 6089 if (ibmvfc_alloc_channels(vhost, &vhost->scsi_scrqs)) { 6090 vhost->do_enquiry = 0; 6091 vhost->mq_enabled = 0; 6092 return; 6093 } 6094 6095 ibmvfc_reg_sub_crqs(vhost, &vhost->scsi_scrqs); 6096 6097 LEAVE; 6098 } 6099 6100 static void ibmvfc_release_channels(struct ibmvfc_host *vhost, 6101 struct ibmvfc_channels *channels) 6102 { 6103 struct ibmvfc_queue *scrq; 6104 int i; 6105 6106 if (channels->scrqs) { 6107 for (i = 0; i < channels->max_queues; i++) { 6108 scrq = &channels->scrqs[i]; 6109 ibmvfc_free_queue(vhost, scrq); 6110 } 6111 6112 kfree(channels->scrqs); 6113 channels->scrqs = NULL; 6114 channels->active_queues = 0; 6115 } 6116 } 6117 6118 static void ibmvfc_release_sub_crqs(struct ibmvfc_host *vhost) 6119 { 6120 ENTER; 6121 if (!vhost->scsi_scrqs.scrqs) 6122 return; 6123 6124 ibmvfc_dereg_sub_crqs(vhost, &vhost->scsi_scrqs); 6125 6126 ibmvfc_release_channels(vhost, &vhost->scsi_scrqs); 6127 LEAVE; 6128 } 6129 6130 static void ibmvfc_free_disc_buf(struct device *dev, struct ibmvfc_channels *channels) 6131 { 6132 dma_free_coherent(dev, channels->disc_buf_sz, channels->disc_buf, 6133 channels->disc_buf_dma); 6134 } 6135 6136 /** 6137 * ibmvfc_free_mem - Free memory for vhost 6138 * @vhost: ibmvfc host struct 6139 * 6140 * Return value: 6141 * none 6142 **/ 6143 static void ibmvfc_free_mem(struct ibmvfc_host *vhost) 6144 { 6145 struct ibmvfc_queue *async_q = &vhost->async_crq; 6146 6147 ENTER; 6148 mempool_destroy(vhost->tgt_pool); 6149 kfree(vhost->trace); 6150 ibmvfc_free_disc_buf(vhost->dev, &vhost->scsi_scrqs); 6151 dma_free_coherent(vhost->dev, sizeof(*vhost->login_buf), 6152 vhost->login_buf, vhost->login_buf_dma); 6153 dma_free_coherent(vhost->dev, sizeof(*vhost->channel_setup_buf), 6154 vhost->channel_setup_buf, vhost->channel_setup_dma); 6155 dma_pool_destroy(vhost->sg_pool); 6156 ibmvfc_free_queue(vhost, async_q); 6157 LEAVE; 6158 } 6159 6160 static int ibmvfc_alloc_disc_buf(struct device *dev, struct ibmvfc_channels *channels) 6161 { 6162 channels->disc_buf_sz = sizeof(*channels->disc_buf) * max_targets; 6163 channels->disc_buf = dma_alloc_coherent(dev, channels->disc_buf_sz, 6164 &channels->disc_buf_dma, GFP_KERNEL); 6165 6166 if (!channels->disc_buf) { 6167 dev_err(dev, "Couldn't allocate %s Discover Targets buffer\n", 6168 (channels->protocol == IBMVFC_PROTO_SCSI) ? "SCSI" : "NVMe"); 6169 return -ENOMEM; 6170 } 6171 6172 return 0; 6173 } 6174 6175 /** 6176 * ibmvfc_alloc_mem - Allocate memory for vhost 6177 * @vhost: ibmvfc host struct 6178 * 6179 * Return value: 6180 * 0 on success / non-zero on failure 6181 **/ 6182 static int ibmvfc_alloc_mem(struct ibmvfc_host *vhost) 6183 { 6184 struct ibmvfc_queue *async_q = &vhost->async_crq; 6185 struct device *dev = vhost->dev; 6186 6187 ENTER; 6188 if (ibmvfc_alloc_queue(vhost, async_q, IBMVFC_ASYNC_FMT)) { 6189 dev_err(dev, "Couldn't allocate/map async queue.\n"); 6190 goto nomem; 6191 } 6192 6193 vhost->sg_pool = dma_pool_create(IBMVFC_NAME, dev, 6194 SG_ALL * sizeof(struct srp_direct_buf), 6195 sizeof(struct srp_direct_buf), 0); 6196 6197 if (!vhost->sg_pool) { 6198 dev_err(dev, "Failed to allocate sg pool\n"); 6199 goto unmap_async_crq; 6200 } 6201 6202 vhost->login_buf = dma_alloc_coherent(dev, sizeof(*vhost->login_buf), 6203 &vhost->login_buf_dma, GFP_KERNEL); 6204 6205 if (!vhost->login_buf) { 6206 dev_err(dev, "Couldn't allocate NPIV login buffer\n"); 6207 goto free_sg_pool; 6208 } 6209 6210 if (ibmvfc_alloc_disc_buf(dev, &vhost->scsi_scrqs)) 6211 goto free_login_buffer; 6212 6213 vhost->trace = kzalloc_objs(struct ibmvfc_trace_entry, 6214 IBMVFC_NUM_TRACE_ENTRIES); 6215 atomic_set(&vhost->trace_index, -1); 6216 6217 if (!vhost->trace) 6218 goto free_scsi_disc_buffer; 6219 6220 vhost->tgt_pool = mempool_create_kmalloc_pool(IBMVFC_TGT_MEMPOOL_SZ, 6221 sizeof(struct ibmvfc_target)); 6222 6223 if (!vhost->tgt_pool) { 6224 dev_err(dev, "Couldn't allocate target memory pool\n"); 6225 goto free_trace; 6226 } 6227 6228 vhost->channel_setup_buf = dma_alloc_coherent(dev, sizeof(*vhost->channel_setup_buf), 6229 &vhost->channel_setup_dma, 6230 GFP_KERNEL); 6231 6232 if (!vhost->channel_setup_buf) { 6233 dev_err(dev, "Couldn't allocate Channel Setup buffer\n"); 6234 goto free_tgt_pool; 6235 } 6236 6237 LEAVE; 6238 return 0; 6239 6240 free_tgt_pool: 6241 mempool_destroy(vhost->tgt_pool); 6242 free_trace: 6243 kfree(vhost->trace); 6244 free_scsi_disc_buffer: 6245 ibmvfc_free_disc_buf(dev, &vhost->scsi_scrqs); 6246 free_login_buffer: 6247 dma_free_coherent(dev, sizeof(*vhost->login_buf), 6248 vhost->login_buf, vhost->login_buf_dma); 6249 free_sg_pool: 6250 dma_pool_destroy(vhost->sg_pool); 6251 unmap_async_crq: 6252 ibmvfc_free_queue(vhost, async_q); 6253 nomem: 6254 LEAVE; 6255 return -ENOMEM; 6256 } 6257 6258 /** 6259 * ibmvfc_rport_add_thread - Worker thread for rport adds 6260 * @work: work struct 6261 * 6262 **/ 6263 static void ibmvfc_rport_add_thread(struct work_struct *work) 6264 { 6265 struct ibmvfc_host *vhost = container_of(work, struct ibmvfc_host, 6266 rport_add_work_q); 6267 struct ibmvfc_target *tgt; 6268 struct fc_rport *rport; 6269 unsigned long flags; 6270 int did_work; 6271 6272 ENTER; 6273 spin_lock_irqsave(vhost->host->host_lock, flags); 6274 do { 6275 did_work = 0; 6276 if (vhost->state != IBMVFC_ACTIVE) 6277 break; 6278 6279 list_for_each_entry(tgt, &vhost->targets, queue) { 6280 if (tgt->add_rport) { 6281 did_work = 1; 6282 tgt->add_rport = 0; 6283 kref_get(&tgt->kref); 6284 rport = tgt->rport; 6285 if (!rport) { 6286 spin_unlock_irqrestore(vhost->host->host_lock, flags); 6287 ibmvfc_tgt_add_rport(tgt); 6288 } else if (get_device(&rport->dev)) { 6289 spin_unlock_irqrestore(vhost->host->host_lock, flags); 6290 tgt_dbg(tgt, "Setting rport roles\n"); 6291 fc_remote_port_rolechg(rport, tgt->ids.roles); 6292 put_device(&rport->dev); 6293 } else { 6294 spin_unlock_irqrestore(vhost->host->host_lock, flags); 6295 } 6296 6297 kref_put(&tgt->kref, ibmvfc_release_tgt); 6298 spin_lock_irqsave(vhost->host->host_lock, flags); 6299 break; 6300 } 6301 } 6302 } while(did_work); 6303 6304 if (vhost->state == IBMVFC_ACTIVE) 6305 vhost->scan_complete = 1; 6306 spin_unlock_irqrestore(vhost->host->host_lock, flags); 6307 LEAVE; 6308 } 6309 6310 /** 6311 * ibmvfc_probe - Adapter hot plug add entry point 6312 * @vdev: vio device struct 6313 * @id: vio device id struct 6314 * 6315 * Return value: 6316 * 0 on success / non-zero on failure 6317 **/ 6318 static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id) 6319 { 6320 struct ibmvfc_host *vhost; 6321 struct Scsi_Host *shost; 6322 struct device *dev = &vdev->dev; 6323 int rc = -ENOMEM; 6324 unsigned int online_cpus = num_online_cpus(); 6325 unsigned int max_scsi_queues = min((unsigned int)IBMVFC_MAX_SCSI_QUEUES, online_cpus); 6326 6327 ENTER; 6328 shost = scsi_host_alloc(&driver_template, sizeof(*vhost)); 6329 if (!shost) { 6330 dev_err(dev, "Couldn't allocate host data\n"); 6331 goto out; 6332 } 6333 6334 shost->transportt = ibmvfc_transport_template; 6335 shost->can_queue = scsi_qdepth; 6336 shost->max_lun = max_lun; 6337 shost->max_id = max_targets; 6338 shost->max_sectors = max_sectors; 6339 shost->max_cmd_len = IBMVFC_MAX_CDB_LEN; 6340 shost->unique_id = shost->host_no; 6341 shost->nr_hw_queues = mq_enabled ? min(max_scsi_queues, nr_scsi_hw_queues) : 1; 6342 6343 vhost = shost_priv(shost); 6344 INIT_LIST_HEAD(&vhost->targets); 6345 INIT_LIST_HEAD(&vhost->purge); 6346 sprintf(vhost->name, IBMVFC_NAME); 6347 vhost->host = shost; 6348 vhost->dev = dev; 6349 vhost->partition_number = -1; 6350 vhost->log_level = log_level; 6351 vhost->task_set = 1; 6352 6353 vhost->mq_enabled = mq_enabled; 6354 vhost->scsi_scrqs.desired_queues = min(shost->nr_hw_queues, nr_scsi_channels); 6355 vhost->scsi_scrqs.max_queues = shost->nr_hw_queues; 6356 vhost->scsi_scrqs.protocol = IBMVFC_PROTO_SCSI; 6357 vhost->using_channels = 0; 6358 vhost->do_enquiry = 1; 6359 vhost->scan_timeout = 0; 6360 6361 strcpy(vhost->partition_name, "UNKNOWN"); 6362 init_waitqueue_head(&vhost->work_wait_q); 6363 init_waitqueue_head(&vhost->init_wait_q); 6364 INIT_WORK(&vhost->rport_add_work_q, ibmvfc_rport_add_thread); 6365 mutex_init(&vhost->passthru_mutex); 6366 6367 if ((rc = ibmvfc_alloc_mem(vhost))) 6368 goto free_scsi_host; 6369 6370 vhost->work_thread = kthread_run(ibmvfc_work, vhost, "%s_%d", IBMVFC_NAME, 6371 shost->host_no); 6372 6373 if (IS_ERR(vhost->work_thread)) { 6374 dev_err(dev, "Couldn't create kernel thread: %ld\n", 6375 PTR_ERR(vhost->work_thread)); 6376 rc = PTR_ERR(vhost->work_thread); 6377 goto free_host_mem; 6378 } 6379 6380 if ((rc = ibmvfc_init_crq(vhost))) { 6381 dev_err(dev, "Couldn't initialize crq. rc=%d\n", rc); 6382 goto kill_kthread; 6383 } 6384 6385 if ((rc = scsi_add_host(shost, dev))) 6386 goto release_crq; 6387 6388 fc_host_dev_loss_tmo(shost) = IBMVFC_DEV_LOSS_TMO; 6389 6390 if ((rc = ibmvfc_create_trace_file(&shost->shost_dev.kobj, 6391 &ibmvfc_trace_attr))) { 6392 dev_err(dev, "Failed to create trace file. rc=%d\n", rc); 6393 goto remove_shost; 6394 } 6395 6396 ibmvfc_init_sub_crqs(vhost); 6397 6398 dev_set_drvdata(dev, vhost); 6399 spin_lock(&ibmvfc_driver_lock); 6400 list_add_tail(&vhost->queue, &ibmvfc_head); 6401 spin_unlock(&ibmvfc_driver_lock); 6402 6403 ibmvfc_send_crq_init(vhost); 6404 scsi_scan_host(shost); 6405 return 0; 6406 6407 remove_shost: 6408 scsi_remove_host(shost); 6409 release_crq: 6410 ibmvfc_release_crq_queue(vhost); 6411 kill_kthread: 6412 kthread_stop(vhost->work_thread); 6413 free_host_mem: 6414 ibmvfc_free_mem(vhost); 6415 free_scsi_host: 6416 scsi_host_put(shost); 6417 out: 6418 LEAVE; 6419 return rc; 6420 } 6421 6422 /** 6423 * ibmvfc_remove - Adapter hot plug remove entry point 6424 * @vdev: vio device struct 6425 * 6426 * Return value: 6427 * 0 6428 **/ 6429 static void ibmvfc_remove(struct vio_dev *vdev) 6430 { 6431 struct ibmvfc_host *vhost = dev_get_drvdata(&vdev->dev); 6432 LIST_HEAD(purge); 6433 unsigned long flags; 6434 6435 ENTER; 6436 ibmvfc_remove_trace_file(&vhost->host->shost_dev.kobj, &ibmvfc_trace_attr); 6437 6438 spin_lock_irqsave(vhost->host->host_lock, flags); 6439 ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE); 6440 spin_unlock_irqrestore(vhost->host->host_lock, flags); 6441 6442 ibmvfc_wait_while_resetting(vhost); 6443 kthread_stop(vhost->work_thread); 6444 fc_remove_host(vhost->host); 6445 scsi_remove_host(vhost->host); 6446 6447 spin_lock_irqsave(vhost->host->host_lock, flags); 6448 ibmvfc_purge_requests(vhost, DID_ERROR); 6449 list_splice_init(&vhost->purge, &purge); 6450 spin_unlock_irqrestore(vhost->host->host_lock, flags); 6451 ibmvfc_complete_purge(&purge); 6452 ibmvfc_release_sub_crqs(vhost); 6453 ibmvfc_release_crq_queue(vhost); 6454 6455 ibmvfc_free_mem(vhost); 6456 spin_lock(&ibmvfc_driver_lock); 6457 list_del(&vhost->queue); 6458 spin_unlock(&ibmvfc_driver_lock); 6459 scsi_host_put(vhost->host); 6460 LEAVE; 6461 } 6462 6463 /** 6464 * ibmvfc_resume - Resume from suspend 6465 * @dev: device struct 6466 * 6467 * We may have lost an interrupt across suspend/resume, so kick the 6468 * interrupt handler 6469 * 6470 */ 6471 static int ibmvfc_resume(struct device *dev) 6472 { 6473 unsigned long flags; 6474 struct ibmvfc_host *vhost = dev_get_drvdata(dev); 6475 struct vio_dev *vdev = to_vio_dev(dev); 6476 6477 spin_lock_irqsave(vhost->host->host_lock, flags); 6478 vio_disable_interrupts(vdev); 6479 tasklet_schedule(&vhost->tasklet); 6480 spin_unlock_irqrestore(vhost->host->host_lock, flags); 6481 return 0; 6482 } 6483 6484 /** 6485 * ibmvfc_get_desired_dma - Calculate DMA resources needed by the driver 6486 * @vdev: vio device struct 6487 * 6488 * Return value: 6489 * Number of bytes the driver will need to DMA map at the same time in 6490 * order to perform well. 6491 */ 6492 static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev) 6493 { 6494 unsigned long pool_dma; 6495 6496 pool_dma = (IBMVFC_MAX_SCSI_QUEUES * scsi_qdepth) * sizeof(union ibmvfc_iu); 6497 return pool_dma + ((512 * 1024) * driver_template.cmd_per_lun); 6498 } 6499 6500 static const struct vio_device_id ibmvfc_device_table[] = { 6501 {"fcp", "IBM,vfc-client"}, 6502 { "", "" } 6503 }; 6504 MODULE_DEVICE_TABLE(vio, ibmvfc_device_table); 6505 6506 static const struct dev_pm_ops ibmvfc_pm_ops = { 6507 .resume = ibmvfc_resume 6508 }; 6509 6510 static struct vio_driver ibmvfc_driver = { 6511 .id_table = ibmvfc_device_table, 6512 .probe = ibmvfc_probe, 6513 .remove = ibmvfc_remove, 6514 .get_desired_dma = ibmvfc_get_desired_dma, 6515 .name = IBMVFC_NAME, 6516 .pm = &ibmvfc_pm_ops, 6517 }; 6518 6519 static struct fc_function_template ibmvfc_transport_functions = { 6520 .show_host_fabric_name = 1, 6521 .show_host_node_name = 1, 6522 .show_host_port_name = 1, 6523 .show_host_supported_classes = 1, 6524 .show_host_port_type = 1, 6525 .show_host_port_id = 1, 6526 .show_host_maxframe_size = 1, 6527 6528 .get_host_port_state = ibmvfc_get_host_port_state, 6529 .show_host_port_state = 1, 6530 6531 .get_host_speed = ibmvfc_get_host_speed, 6532 .show_host_speed = 1, 6533 6534 .issue_fc_host_lip = ibmvfc_issue_fc_host_lip, 6535 .terminate_rport_io = ibmvfc_terminate_rport_io, 6536 6537 .show_rport_maxframe_size = 1, 6538 .show_rport_supported_classes = 1, 6539 6540 .set_rport_dev_loss_tmo = ibmvfc_set_rport_dev_loss_tmo, 6541 .show_rport_dev_loss_tmo = 1, 6542 6543 .get_starget_node_name = ibmvfc_get_starget_node_name, 6544 .show_starget_node_name = 1, 6545 6546 .get_starget_port_name = ibmvfc_get_starget_port_name, 6547 .show_starget_port_name = 1, 6548 6549 .get_starget_port_id = ibmvfc_get_starget_port_id, 6550 .show_starget_port_id = 1, 6551 6552 .max_bsg_segments = 1, 6553 .bsg_request = ibmvfc_bsg_request, 6554 .bsg_timeout = ibmvfc_bsg_timeout, 6555 }; 6556 6557 /** 6558 * ibmvfc_module_init - Initialize the ibmvfc module 6559 * 6560 * Return value: 6561 * 0 on success / other on failure 6562 **/ 6563 static int __init ibmvfc_module_init(void) 6564 { 6565 int min_max_sectors = PAGE_SIZE >> 9; 6566 int rc; 6567 6568 if (!firmware_has_feature(FW_FEATURE_VIO)) 6569 return -ENODEV; 6570 6571 printk(KERN_INFO IBMVFC_NAME": IBM Virtual Fibre Channel Driver version: %s %s\n", 6572 IBMVFC_DRIVER_VERSION, IBMVFC_DRIVER_DATE); 6573 6574 /* 6575 * Range check the max_sectors module parameter. The upper bounds is 6576 * implicity checked since the parameter is a ushort. 6577 */ 6578 if (max_sectors < min_max_sectors) { 6579 printk(KERN_ERR IBMVFC_NAME ": max_sectors must be at least %d.\n", 6580 min_max_sectors); 6581 max_sectors = min_max_sectors; 6582 } 6583 6584 ibmvfc_transport_template = fc_attach_transport(&ibmvfc_transport_functions); 6585 if (!ibmvfc_transport_template) 6586 return -ENOMEM; 6587 6588 rc = vio_register_driver(&ibmvfc_driver); 6589 if (rc) 6590 fc_release_transport(ibmvfc_transport_template); 6591 return rc; 6592 } 6593 6594 /** 6595 * ibmvfc_module_exit - Teardown the ibmvfc module 6596 * 6597 * Return value: 6598 * nothing 6599 **/ 6600 static void __exit ibmvfc_module_exit(void) 6601 { 6602 vio_unregister_driver(&ibmvfc_driver); 6603 fc_release_transport(ibmvfc_transport_template); 6604 } 6605 6606 module_init(ibmvfc_module_init); 6607 module_exit(ibmvfc_module_exit); 6608