drivers/s390/scsi/zfcp_scsi.c

   1 /*
   2  * zfcp device driver
   3  *
   4  * Interface to Linux SCSI midlayer.
   5  *
   6  * Copyright IBM Corporation 2002, 2008
   7  */
   8
   9 #include "zfcp_ext.h"
  10 #include <asm/atomic.h>
  11
  12 /* Find start of Sense Information in FCP response unit*/
  13 char *zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
  14 {
  15         char *fcp_sns_info_ptr;
  16
  17         fcp_sns_info_ptr = (unsigned char *) &fcp_rsp_iu[1];
  18         if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)
  19                 fcp_sns_info_ptr += fcp_rsp_iu->fcp_rsp_len;
  20
  21         return fcp_sns_info_ptr;
  22 }
  23
  24 static void zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
  25 {
  26         struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata;
  27         WARN_ON(!unit);
  28         if (unit) {
  29                 atomic_clear_mask(ZFCP_STATUS_UNIT_REGISTERED, &unit->status);
  30                 sdpnt->hostdata = NULL;
  31                 unit->device = NULL;
  32                 zfcp_erp_unit_failed(unit, 12, NULL);
  33                 zfcp_unit_put(unit);
  34         }
  35 }
  36
  37 static int zfcp_scsi_slave_configure(struct scsi_device *sdp)
  38 {
  39         if (sdp->tagged_supported)
  40                 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, 32);
  41         else
  42                 scsi_adjust_queue_depth(sdp, 0, 1);
  43         return 0;
  44 }
  45
  46 static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
  47 {
  48         set_host_byte(scpnt, result);
  49         if ((scpnt->device != NULL) && (scpnt->device->host != NULL))
  50                 zfcp_scsi_dbf_event_result("fail", 4,
  51                         (struct zfcp_adapter*) scpnt->device->host->hostdata[0],
  52                         scpnt, NULL);
  53         /* return directly */
  54         scpnt->scsi_done(scpnt);
  55 }
  56
  57 static int zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
  58                                   void (*done) (struct scsi_cmnd *))
  59 {
  60         struct zfcp_unit *unit;
  61         struct zfcp_adapter *adapter;
  62         int    status;
  63         int    ret;
  64
  65         /* reset the status for this request */
  66         scpnt->result = 0;
  67         scpnt->host_scribble = NULL;
  68         scpnt->scsi_done = done;
  69
  70         /*
  71          * figure out adapter and target device
  72          * (stored there by zfcp_scsi_slave_alloc)
  73          */
  74         adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
  75         unit = scpnt->device->hostdata;
  76
  77         BUG_ON(!adapter || (adapter != unit->port->adapter));
  78         BUG_ON(!scpnt->scsi_done);
  79
  80         if (unlikely(!unit)) {
  81                 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
  82                 return 0;
  83         }
  84
  85         status = atomic_read(&unit->status);
  86         if (unlikely((status & ZFCP_STATUS_COMMON_ERP_FAILED) ||
  87                      !(status & ZFCP_STATUS_COMMON_RUNNING))) {
  88                 zfcp_scsi_command_fail(scpnt, DID_ERROR);
  89                 return 0;;
  90         }
  91
  92         ret = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, 0,
  93                                              ZFCP_REQ_AUTO_CLEANUP);
  94         if (unlikely(ret == -EBUSY))
  95                 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
  96         else if (unlikely(ret < 0))
  97                 return SCSI_MLQUEUE_HOST_BUSY;
  98
  99         return ret;
 100 }
 101
 102 static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *adapter,
 103                                           int channel, unsigned int id,
 104                                           unsigned int lun)
 105 {
 106         struct zfcp_port *port;
 107         struct zfcp_unit *unit;
 108         int scsi_lun;
 109
 110         list_for_each_entry(port, &adapter->port_list_head, list) {
 111                 if (!port->rport || (id != port->rport->scsi_target_id))
 112                         continue;
 113                 list_for_each_entry(unit, &port->unit_list_head, list) {
 114                         scsi_lun = scsilun_to_int(
 115                                 (struct scsi_lun *)&unit->fcp_lun);
 116                         if (lun == scsi_lun)
 117                                 return unit;
 118                 }
 119         }
 120
 121         return NULL;
 122 }
 123
 124 static int zfcp_scsi_slave_alloc(struct scsi_device *sdp)
 125 {
 126         struct zfcp_adapter *adapter;
 127         struct zfcp_unit *unit;
 128         unsigned long flags;
 129         int retval = -ENXIO;
 130
 131         adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
 132         if (!adapter)
 133                 goto out;
 134
 135         read_lock_irqsave(&zfcp_data.config_lock, flags);
 136         unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun);
 137         if (unit &&
 138             (atomic_read(&unit->status) & ZFCP_STATUS_UNIT_REGISTERED)) {
 139                 sdp->hostdata = unit;
 140                 unit->device = sdp;
 141                 zfcp_unit_get(unit);
 142                 retval = 0;
 143         }
 144         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 145 out:
 146         return retval;
 147 }
 148
 149 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 150 {
 151         struct Scsi_Host *scsi_host;
 152         struct zfcp_adapter *adapter;
 153         struct zfcp_unit *unit;
 154         struct zfcp_fsf_req *fsf_req;
 155         unsigned long flags;
 156         unsigned long old_req_id = (unsigned long) scpnt->host_scribble;
 157         int retval = SUCCESS;
 158
 159         scsi_host = scpnt->device->host;
 160         adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
 161         unit = scpnt->device->hostdata;
 162
 163         /* avoid race condition between late normal completion and abort */
 164         write_lock_irqsave(&adapter->abort_lock, flags);
 165
 166         /* Check whether corresponding fsf_req is still pending */
 167         spin_lock(&adapter->req_list_lock);
 168         fsf_req = zfcp_reqlist_find(adapter, old_req_id);
 169         spin_unlock(&adapter->req_list_lock);
 170         if (!fsf_req) {
 171                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 172                 zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, NULL, 0);
 173                 return retval;
 174         }
 175         fsf_req->data = NULL;
 176
 177         /* don't access old fsf_req after releasing the abort_lock */
 178         write_unlock_irqrestore(&adapter->abort_lock, flags);
 179
 180         fsf_req = zfcp_fsf_abort_fcp_command(old_req_id, adapter, unit, 0);
 181         if (!fsf_req) {
 182                 zfcp_scsi_dbf_event_abort("nres", adapter, scpnt, NULL,
 183                                           old_req_id);
 184                 retval = FAILED;
 185                 return retval;
 186         }
 187
 188         __wait_event(fsf_req->completion_wq,
 189                      fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 190
 191         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) {
 192                 zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, fsf_req, 0);
 193         } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) {
 194                 zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, fsf_req, 0);
 195         } else {
 196                 zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, fsf_req, 0);
 197                 retval = FAILED;
 198         }
 199         zfcp_fsf_req_free(fsf_req);
 200
 201         return retval;
 202 }
 203
 204 static int zfcp_task_mgmt_function(struct zfcp_unit *unit, u8 tm_flags,
 205                                          struct scsi_cmnd *scpnt)
 206 {
 207         struct zfcp_adapter *adapter = unit->port->adapter;
 208         struct zfcp_fsf_req *fsf_req;
 209         int retval = SUCCESS;
 210
 211         /* issue task management function */
 212         fsf_req = zfcp_fsf_send_fcp_ctm(adapter, unit, tm_flags, 0);
 213         if (!fsf_req) {
 214                 zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit, scpnt);
 215                 return FAILED;
 216         }
 217
 218         __wait_event(fsf_req->completion_wq,
 219                      fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 220
 221         /*
 222          * check completion status of task management function
 223          */
 224         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 225                 zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt);
 226                 retval = FAILED;
 227         } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) {
 228                 zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt);
 229                 retval = FAILED;
 230         } else
 231                 zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt);
 232
 233         zfcp_fsf_req_free(fsf_req);
 234
 235         return retval;
 236 }
 237
 238 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 239 {
 240         struct zfcp_unit *unit = scpnt->device->hostdata;
 241
 242         if (!unit) {
 243                 WARN_ON(1);
 244                 return SUCCESS;
 245         }
 246         return zfcp_task_mgmt_function(unit, FCP_LOGICAL_UNIT_RESET, scpnt);
 247 }
 248
 249 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
 250 {
 251         struct zfcp_unit *unit = scpnt->device->hostdata;
 252
 253         if (!unit) {
 254                 WARN_ON(1);
 255                 return SUCCESS;
 256         }
 257         return zfcp_task_mgmt_function(unit, FCP_TARGET_RESET, scpnt);
 258 }
 259
 260 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 261 {
 262         struct zfcp_unit *unit;
 263         struct zfcp_adapter *adapter;
 264
 265         unit = scpnt->device->hostdata;
 266         adapter = unit->port->adapter;
 267         zfcp_erp_adapter_reopen(adapter, 0, 141, scpnt);
 268         zfcp_erp_wait(adapter);
 269
 270         return SUCCESS;
 271 }
 272
 273 int zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
 274 {
 275         struct ccw_dev_id dev_id;
 276
 277         if (adapter->scsi_host)
 278                 return 0;
 279
 280         ccw_device_get_id(adapter->ccw_device, &dev_id);
 281         /* register adapter as SCSI host with mid layer of SCSI stack */
 282         adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
 283                                              sizeof (struct zfcp_adapter *));
 284         if (!adapter->scsi_host) {
 285                 dev_err(&adapter->ccw_device->dev,
 286                         "Registering the FCP device with the "
 287                         "SCSI stack failed\n");
 288                 return -EIO;
 289         }
 290
 291         /* tell the SCSI stack some characteristics of this adapter */
 292         adapter->scsi_host->max_id = 1;
 293         adapter->scsi_host->max_lun = 1;
 294         adapter->scsi_host->max_channel = 0;
 295         adapter->scsi_host->unique_id = dev_id.devno;
 296         adapter->scsi_host->max_cmd_len = 255;
 297         adapter->scsi_host->transportt = zfcp_data.scsi_transport_template;
 298
 299         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 300
 301         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 302                 scsi_host_put(adapter->scsi_host);
 303                 return -EIO;
 304         }
 305
 306         return 0;
 307 }
 308
 309 void zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
 310 {
 311         struct Scsi_Host *shost;
 312         struct zfcp_port *port;
 313
 314         shost = adapter->scsi_host;
 315         if (!shost)
 316                 return;
 317
 318         read_lock_irq(&zfcp_data.config_lock);
 319         list_for_each_entry(port, &adapter->port_list_head, list)
 320                 if (port->rport)
 321                         port->rport = NULL;
 322
 323         read_unlock_irq(&zfcp_data.config_lock);
 324         fc_remove_host(shost);
 325         scsi_remove_host(shost);
 326         scsi_host_put(shost);
 327         adapter->scsi_host = NULL;
 328
 329         return;
 330 }
 331
 332 static struct fc_host_statistics*
 333 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 334 {
 335         struct fc_host_statistics *fc_stats;
 336
 337         if (!adapter->fc_stats) {
 338                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 339                 if (!fc_stats)
 340                         return NULL;
 341                 adapter->fc_stats = fc_stats; /* freed in adater_dequeue */
 342         }
 343         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 344         return adapter->fc_stats;
 345 }
 346
 347 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 348                                       struct fsf_qtcb_bottom_port *data,
 349                                       struct fsf_qtcb_bottom_port *old)
 350 {
 351         fc_stats->seconds_since_last_reset =
 352                 data->seconds_since_last_reset - old->seconds_since_last_reset;
 353         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 354         fc_stats->tx_words = data->tx_words - old->tx_words;
 355         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 356         fc_stats->rx_words = data->rx_words - old->rx_words;
 357         fc_stats->lip_count = data->lip - old->lip;
 358         fc_stats->nos_count = data->nos - old->nos;
 359         fc_stats->error_frames = data->error_frames - old->error_frames;
 360         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 361         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 362         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 363         fc_stats->loss_of_signal_count =
 364                 data->loss_of_signal - old->loss_of_signal;
 365         fc_stats->prim_seq_protocol_err_count =
 366                 data->psp_error_counts - old->psp_error_counts;
 367         fc_stats->invalid_tx_word_count =
 368                 data->invalid_tx_words - old->invalid_tx_words;
 369         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 370         fc_stats->fcp_input_requests =
 371                 data->input_requests - old->input_requests;
 372         fc_stats->fcp_output_requests =
 373                 data->output_requests - old->output_requests;
 374         fc_stats->fcp_control_requests =
 375                 data->control_requests - old->control_requests;
 376         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 377         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 378 }
 379
 380 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 381                                    struct fsf_qtcb_bottom_port *data)
 382 {
 383         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 384         fc_stats->tx_frames = data->tx_frames;
 385         fc_stats->tx_words = data->tx_words;
 386         fc_stats->rx_frames = data->rx_frames;
 387         fc_stats->rx_words = data->rx_words;
 388         fc_stats->lip_count = data->lip;
 389         fc_stats->nos_count = data->nos;
 390         fc_stats->error_frames = data->error_frames;
 391         fc_stats->dumped_frames = data->dumped_frames;
 392         fc_stats->link_failure_count = data->link_failure;
 393         fc_stats->loss_of_sync_count = data->loss_of_sync;
 394         fc_stats->loss_of_signal_count = data->loss_of_signal;
 395         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 396         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 397         fc_stats->invalid_crc_count = data->invalid_crcs;
 398         fc_stats->fcp_input_requests = data->input_requests;
 399         fc_stats->fcp_output_requests = data->output_requests;
 400         fc_stats->fcp_control_requests = data->control_requests;
 401         fc_stats->fcp_input_megabytes = data->input_mb;
 402         fc_stats->fcp_output_megabytes = data->output_mb;
 403 }
 404
 405 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
 406 {
 407         struct zfcp_adapter *adapter;
 408         struct fc_host_statistics *fc_stats;
 409         struct fsf_qtcb_bottom_port *data;
 410         int ret;
 411
 412         adapter = (struct zfcp_adapter *)host->hostdata[0];
 413         fc_stats = zfcp_init_fc_host_stats(adapter);
 414         if (!fc_stats)
 415                 return NULL;
 416
 417         data = kzalloc(sizeof(*data), GFP_KERNEL);
 418         if (!data)
 419                 return NULL;
 420
 421         ret = zfcp_fsf_exchange_port_data_sync(adapter, data);
 422         if (ret) {
 423                 kfree(data);
 424                 return NULL;
 425         }
 426
 427         if (adapter->stats_reset &&
 428             ((jiffies/HZ - adapter->stats_reset) <
 429              data->seconds_since_last_reset))
 430                 zfcp_adjust_fc_host_stats(fc_stats, data,
 431                                           adapter->stats_reset_data);
 432         else
 433                 zfcp_set_fc_host_stats(fc_stats, data);
 434
 435         kfree(data);
 436         return fc_stats;
 437 }
 438
 439 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 440 {
 441         struct zfcp_adapter *adapter;
 442         struct fsf_qtcb_bottom_port *data;
 443         int ret;
 444
 445         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 446         data = kzalloc(sizeof(*data), GFP_KERNEL);
 447         if (!data)
 448                 return;
 449
 450         ret = zfcp_fsf_exchange_port_data_sync(adapter, data);
 451         if (ret)
 452                 kfree(data);
 453         else {
 454                 adapter->stats_reset = jiffies/HZ;
 455                 kfree(adapter->stats_reset_data);
 456                 adapter->stats_reset_data = data; /* finally freed in
 457                                                      adapter_dequeue */
 458         }
 459 }
 460
 461 static void zfcp_get_host_port_state(struct Scsi_Host *shost)
 462 {
 463         struct zfcp_adapter *adapter =
 464                 (struct zfcp_adapter *)shost->hostdata[0];
 465         int status = atomic_read(&adapter->status);
 466
 467         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
 468             !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
 469                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
 470         else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 471                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
 472         else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
 473                 fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
 474         else
 475                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
 476 }
 477
 478 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
 479 {
 480         rport->dev_loss_tmo = timeout;
 481 }
 482
 483 struct fc_function_template zfcp_transport_functions = {
 484         .show_starget_port_id = 1,
 485         .show_starget_port_name = 1,
 486         .show_starget_node_name = 1,
 487         .show_rport_supported_classes = 1,
 488         .show_rport_maxframe_size = 1,
 489         .show_rport_dev_loss_tmo = 1,
 490         .show_host_node_name = 1,
 491         .show_host_port_name = 1,
 492         .show_host_permanent_port_name = 1,
 493         .show_host_supported_classes = 1,
 494         .show_host_supported_speeds = 1,
 495         .show_host_maxframe_size = 1,
 496         .show_host_serial_number = 1,
 497         .get_fc_host_stats = zfcp_get_fc_host_stats,
 498         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 499         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
 500         .get_host_port_state = zfcp_get_host_port_state,
 501         .show_host_port_state = 1,
 502         /* no functions registered for following dynamic attributes but
 503            directly set by LLDD */
 504         .show_host_port_type = 1,
 505         .show_host_speed = 1,
 506         .show_host_port_id = 1,
 507         .disable_target_scan = 1,
 508 };
 509
 510 struct zfcp_data zfcp_data = {
 511         .scsi_host_template = {
 512                 .name                    = "zfcp",
 513                 .module                  = THIS_MODULE,
 514                 .proc_name               = "zfcp",
 515                 .slave_alloc             = zfcp_scsi_slave_alloc,
 516                 .slave_configure         = zfcp_scsi_slave_configure,
 517                 .slave_destroy           = zfcp_scsi_slave_destroy,
 518                 .queuecommand            = zfcp_scsi_queuecommand,
 519                 .eh_abort_handler        = zfcp_scsi_eh_abort_handler,
 520                 .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
 521                 .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
 522                 .eh_host_reset_handler   = zfcp_scsi_eh_host_reset_handler,
 523                 .can_queue               = 4096,
 524                 .this_id                 = -1,
 525                 .sg_tablesize            = ZFCP_MAX_SBALES_PER_REQ,
 526                 .cmd_per_lun             = 1,
 527                 .use_clustering          = 1,
 528                 .sdev_attrs              = zfcp_sysfs_sdev_attrs,
 529                 .max_sectors             = (ZFCP_MAX_SBALES_PER_REQ * 8),
 530                 .shost_attrs             = zfcp_sysfs_shost_attrs,
 531         },
 532 };