git.oblomov.eu Git - linux-2.6/blob - 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 void zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, fcp_dl_t fcp_dl)
  25 {
  26         fcp_dl_t *fcp_dl_ptr;
  27
  28         /*
  29          * fcp_dl_addr = start address of fcp_cmnd structure +
  30          * size of fixed part + size of dynamically sized add_dcp_cdb field
  31          * SEE FCP-2 documentation
  32          */
  33         fcp_dl_ptr = (fcp_dl_t *) ((unsigned char *) &fcp_cmd[1] +
  34                                    (fcp_cmd->add_fcp_cdb_length << 2));
  35         *fcp_dl_ptr = fcp_dl;
  36 }
  37
  38 static void zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
  39 {
  40         struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata;
  41         WARN_ON(!unit);
  42         if (unit) {
  43                 atomic_clear_mask(ZFCP_STATUS_UNIT_REGISTERED, &unit->status);
  44                 sdpnt->hostdata = NULL;
  45                 unit->device = NULL;
  46                 zfcp_erp_unit_failed(unit, 12, NULL);
  47                 zfcp_unit_put(unit);
  48         }
  49 }
  50
  51 static int zfcp_scsi_slave_configure(struct scsi_device *sdp)
  52 {
  53         if (sdp->tagged_supported)
  54                 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, 32);
  55         else
  56                 scsi_adjust_queue_depth(sdp, 0, 1);
  57         return 0;
  58 }
  59
  60 static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
  61 {
  62         set_host_byte(scpnt, result);
  63         if ((scpnt->device != NULL) && (scpnt->device->host != NULL))
  64                 zfcp_scsi_dbf_event_result("fail", 4,
  65                         (struct zfcp_adapter*) scpnt->device->host->hostdata[0],
  66                         scpnt, NULL);
  67         /* return directly */
  68         scpnt->scsi_done(scpnt);
  69 }
  70
  71 static int zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
  72                                   void (*done) (struct scsi_cmnd *))
  73 {
  74         struct zfcp_unit *unit;
  75         struct zfcp_adapter *adapter;
  76         int    status;
  77         int    ret;
  78
  79         /* reset the status for this request */
  80         scpnt->result = 0;
  81         scpnt->host_scribble = NULL;
  82         scpnt->scsi_done = done;
  83
  84         /*
  85          * figure out adapter and target device
  86          * (stored there by zfcp_scsi_slave_alloc)
  87          */
  88         adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
  89         unit = scpnt->device->hostdata;
  90
  91         BUG_ON(!adapter || (adapter != unit->port->adapter));
  92         BUG_ON(!scpnt->scsi_done);
  93
  94         if (unlikely(!unit)) {
  95                 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
  96                 return 0;
  97         }
  98
  99         status = atomic_read(&unit->status);
 100         if (unlikely((status & ZFCP_STATUS_COMMON_ERP_FAILED) ||
 101                      !(status & ZFCP_STATUS_COMMON_RUNNING))) {
 102                 zfcp_scsi_command_fail(scpnt, DID_ERROR);
 103                 return 0;;
 104         }
 105
 106         ret = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, 0,
 107                                              ZFCP_REQ_AUTO_CLEANUP);
 108         if (unlikely(ret == -EBUSY))
 109                 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
 110         else if (unlikely(ret < 0))
 111                 return SCSI_MLQUEUE_HOST_BUSY;
 112
 113         return ret;
 114 }
 115
 116 static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *adapter,
 117                                           int channel, unsigned int id,
 118                                           unsigned int lun)
 119 {
 120         struct zfcp_port *port;
 121         struct zfcp_unit *unit;
 122
 123         list_for_each_entry(port, &adapter->port_list_head, list) {
 124                 if (!port->rport || (id != port->rport->scsi_target_id))
 125                         continue;
 126                 list_for_each_entry(unit, &port->unit_list_head, list)
 127                         if (lun == unit->scsi_lun)
 128                                 return unit;
 129         }
 130
 131         return NULL;
 132 }
 133
 134 static int zfcp_scsi_slave_alloc(struct scsi_device *sdp)
 135 {
 136         struct zfcp_adapter *adapter;
 137         struct zfcp_unit *unit;
 138         unsigned long flags;
 139         int retval = -ENXIO;
 140
 141         adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
 142         if (!adapter)
 143                 goto out;
 144
 145         read_lock_irqsave(&zfcp_data.config_lock, flags);
 146         unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun);
 147         if (unit &&
 148             (atomic_read(&unit->status) & ZFCP_STATUS_UNIT_REGISTERED)) {
 149                 sdp->hostdata = unit;
 150                 unit->device = sdp;
 151                 zfcp_unit_get(unit);
 152                 retval = 0;
 153         }
 154         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 155 out:
 156         return retval;
 157 }
 158
 159 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 160 {
 161         struct Scsi_Host *scsi_host;
 162         struct zfcp_adapter *adapter;
 163         struct zfcp_unit *unit;
 164         struct zfcp_fsf_req *fsf_req;
 165         unsigned long flags;
 166         unsigned long old_req_id = (unsigned long) scpnt->host_scribble;
 167         int retval = SUCCESS;
 168
 169         scsi_host = scpnt->device->host;
 170         adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
 171         unit = scpnt->device->hostdata;
 172
 173         /* avoid race condition between late normal completion and abort */
 174         write_lock_irqsave(&adapter->abort_lock, flags);
 175
 176         /* Check whether corresponding fsf_req is still pending */
 177         spin_lock(&adapter->req_list_lock);
 178         fsf_req = zfcp_reqlist_find(adapter, old_req_id);
 179         spin_unlock(&adapter->req_list_lock);
 180         if (!fsf_req) {
 181                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 182                 zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, NULL, 0);
 183                 return retval;
 184         }
 185         fsf_req->data = NULL;
 186         fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING;
 187
 188         /* don't access old fsf_req after releasing the abort_lock */
 189         write_unlock_irqrestore(&adapter->abort_lock, flags);
 190
 191         fsf_req = zfcp_fsf_abort_fcp_command(old_req_id, adapter, unit, 0);
 192         if (!fsf_req) {
 193                 zfcp_scsi_dbf_event_abort("nres", adapter, scpnt, NULL,
 194                                           old_req_id);
 195                 retval = FAILED;
 196                 return retval;
 197         }
 198
 199         __wait_event(fsf_req->completion_wq,
 200                      fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 201
 202         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) {
 203                 zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, fsf_req, 0);
 204         } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) {
 205                 zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, fsf_req, 0);
 206         } else {
 207                 zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, fsf_req, 0);
 208                 retval = FAILED;
 209         }
 210         zfcp_fsf_req_free(fsf_req);
 211
 212         return retval;
 213 }
 214
 215 static int zfcp_task_mgmt_function(struct zfcp_unit *unit, u8 tm_flags,
 216                                          struct scsi_cmnd *scpnt)
 217 {
 218         struct zfcp_adapter *adapter = unit->port->adapter;
 219         struct zfcp_fsf_req *fsf_req;
 220         int retval = SUCCESS;
 221
 222         /* issue task management function */
 223         fsf_req = zfcp_fsf_send_fcp_ctm(adapter, unit, tm_flags, 0);
 224         if (!fsf_req) {
 225                 zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit, scpnt);
 226                 return FAILED;
 227         }
 228
 229         __wait_event(fsf_req->completion_wq,
 230                      fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 231
 232         /*
 233          * check completion status of task management function
 234          */
 235         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 236                 zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt);
 237                 retval = FAILED;
 238         } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) {
 239                 zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt);
 240                 retval = FAILED;
 241         } else
 242                 zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt);
 243
 244         zfcp_fsf_req_free(fsf_req);
 245
 246         return retval;
 247 }
 248
 249 static int zfcp_scsi_eh_device_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_LOGICAL_UNIT_RESET, scpnt);
 258 }
 259
 260 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
 261 {
 262         struct zfcp_unit *unit = scpnt->device->hostdata;
 263
 264         if (!unit) {
 265                 WARN_ON(1);
 266                 return SUCCESS;
 267         }
 268         return zfcp_task_mgmt_function(unit, FCP_TARGET_RESET, scpnt);
 269 }
 270
 271 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 272 {
 273         struct zfcp_unit *unit;
 274         struct zfcp_adapter *adapter;
 275
 276         unit = scpnt->device->hostdata;
 277         adapter = unit->port->adapter;
 278         zfcp_erp_adapter_reopen(adapter, 0, 141, scpnt);
 279         zfcp_erp_wait(adapter);
 280
 281         return SUCCESS;
 282 }
 283
 284 int zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
 285 {
 286         struct ccw_dev_id dev_id;
 287
 288         if (adapter->scsi_host)
 289                 return 0;
 290
 291         ccw_device_get_id(adapter->ccw_device, &dev_id);
 292         /* register adapter as SCSI host with mid layer of SCSI stack */
 293         adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
 294                                              sizeof (struct zfcp_adapter *));
 295         if (!adapter->scsi_host) {
 296                 dev_err(&adapter->ccw_device->dev,
 297                         "registration with SCSI stack failed.");
 298                 return -EIO;
 299         }
 300
 301         /* tell the SCSI stack some characteristics of this adapter */
 302         adapter->scsi_host->max_id = 1;
 303         adapter->scsi_host->max_lun = 1;
 304         adapter->scsi_host->max_channel = 0;
 305         adapter->scsi_host->unique_id = dev_id.devno;
 306         adapter->scsi_host->max_cmd_len = 255;
 307         adapter->scsi_host->transportt = zfcp_data.scsi_transport_template;
 308
 309         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 310
 311         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 312                 scsi_host_put(adapter->scsi_host);
 313                 return -EIO;
 314         }
 315         atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
 316
 317         return 0;
 318 }
 319
 320 void zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
 321 {
 322         struct Scsi_Host *shost;
 323         struct zfcp_port *port;
 324
 325         shost = adapter->scsi_host;
 326         if (!shost)
 327                 return;
 328
 329         read_lock_irq(&zfcp_data.config_lock);
 330         list_for_each_entry(port, &adapter->port_list_head, list)
 331                 if (port->rport)
 332                         port->rport = NULL;
 333
 334         read_unlock_irq(&zfcp_data.config_lock);
 335         fc_remove_host(shost);
 336         scsi_remove_host(shost);
 337         scsi_host_put(shost);
 338         adapter->scsi_host = NULL;
 339         atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
 340
 341         return;
 342 }
 343
 344 static struct fc_host_statistics*
 345 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 346 {
 347         struct fc_host_statistics *fc_stats;
 348
 349         if (!adapter->fc_stats) {
 350                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 351                 if (!fc_stats)
 352                         return NULL;
 353                 adapter->fc_stats = fc_stats; /* freed in adater_dequeue */
 354         }
 355         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 356         return adapter->fc_stats;
 357 }
 358
 359 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 360                                       struct fsf_qtcb_bottom_port *data,
 361                                       struct fsf_qtcb_bottom_port *old)
 362 {
 363         fc_stats->seconds_since_last_reset =
 364                 data->seconds_since_last_reset - old->seconds_since_last_reset;
 365         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 366         fc_stats->tx_words = data->tx_words - old->tx_words;
 367         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 368         fc_stats->rx_words = data->rx_words - old->rx_words;
 369         fc_stats->lip_count = data->lip - old->lip;
 370         fc_stats->nos_count = data->nos - old->nos;
 371         fc_stats->error_frames = data->error_frames - old->error_frames;
 372         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 373         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 374         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 375         fc_stats->loss_of_signal_count =
 376                 data->loss_of_signal - old->loss_of_signal;
 377         fc_stats->prim_seq_protocol_err_count =
 378                 data->psp_error_counts - old->psp_error_counts;
 379         fc_stats->invalid_tx_word_count =
 380                 data->invalid_tx_words - old->invalid_tx_words;
 381         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 382         fc_stats->fcp_input_requests =
 383                 data->input_requests - old->input_requests;
 384         fc_stats->fcp_output_requests =
 385                 data->output_requests - old->output_requests;
 386         fc_stats->fcp_control_requests =
 387                 data->control_requests - old->control_requests;
 388         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 389         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 390 }
 391
 392 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 393                                    struct fsf_qtcb_bottom_port *data)
 394 {
 395         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 396         fc_stats->tx_frames = data->tx_frames;
 397         fc_stats->tx_words = data->tx_words;
 398         fc_stats->rx_frames = data->rx_frames;
 399         fc_stats->rx_words = data->rx_words;
 400         fc_stats->lip_count = data->lip;
 401         fc_stats->nos_count = data->nos;
 402         fc_stats->error_frames = data->error_frames;
 403         fc_stats->dumped_frames = data->dumped_frames;
 404         fc_stats->link_failure_count = data->link_failure;
 405         fc_stats->loss_of_sync_count = data->loss_of_sync;
 406         fc_stats->loss_of_signal_count = data->loss_of_signal;
 407         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 408         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 409         fc_stats->invalid_crc_count = data->invalid_crcs;
 410         fc_stats->fcp_input_requests = data->input_requests;
 411         fc_stats->fcp_output_requests = data->output_requests;
 412         fc_stats->fcp_control_requests = data->control_requests;
 413         fc_stats->fcp_input_megabytes = data->input_mb;
 414         fc_stats->fcp_output_megabytes = data->output_mb;
 415 }
 416
 417 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
 418 {
 419         struct zfcp_adapter *adapter;
 420         struct fc_host_statistics *fc_stats;
 421         struct fsf_qtcb_bottom_port *data;
 422         int ret;
 423
 424         adapter = (struct zfcp_adapter *)host->hostdata[0];
 425         fc_stats = zfcp_init_fc_host_stats(adapter);
 426         if (!fc_stats)
 427                 return NULL;
 428
 429         data = kzalloc(sizeof(*data), GFP_KERNEL);
 430         if (!data)
 431                 return NULL;
 432
 433         ret = zfcp_fsf_exchange_port_data_sync(adapter, data);
 434         if (ret) {
 435                 kfree(data);
 436                 return NULL;
 437         }
 438
 439         if (adapter->stats_reset &&
 440             ((jiffies/HZ - adapter->stats_reset) <
 441              data->seconds_since_last_reset))
 442                 zfcp_adjust_fc_host_stats(fc_stats, data,
 443                                           adapter->stats_reset_data);
 444         else
 445                 zfcp_set_fc_host_stats(fc_stats, data);
 446
 447         kfree(data);
 448         return fc_stats;
 449 }
 450
 451 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 452 {
 453         struct zfcp_adapter *adapter;
 454         struct fsf_qtcb_bottom_port *data;
 455         int ret;
 456
 457         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 458         data = kzalloc(sizeof(*data), GFP_KERNEL);
 459         if (!data)
 460                 return;
 461
 462         ret = zfcp_fsf_exchange_port_data_sync(adapter, data);
 463         if (ret)
 464                 kfree(data);
 465         else {
 466                 adapter->stats_reset = jiffies/HZ;
 467                 kfree(adapter->stats_reset_data);
 468                 adapter->stats_reset_data = data; /* finally freed in
 469                                                      adapter_dequeue */
 470         }
 471 }
 472
 473 static void zfcp_get_host_port_state(struct Scsi_Host *shost)
 474 {
 475         struct zfcp_adapter *adapter =
 476                 (struct zfcp_adapter *)shost->hostdata[0];
 477         int status = atomic_read(&adapter->status);
 478
 479         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
 480             !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
 481                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
 482         else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 483                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
 484         else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
 485                 fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
 486         else
 487                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
 488 }
 489
 490 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
 491 {
 492         rport->dev_loss_tmo = timeout;
 493 }
 494
 495 struct fc_function_template zfcp_transport_functions = {
 496         .show_starget_port_id = 1,
 497         .show_starget_port_name = 1,
 498         .show_starget_node_name = 1,
 499         .show_rport_supported_classes = 1,
 500         .show_rport_maxframe_size = 1,
 501         .show_rport_dev_loss_tmo = 1,
 502         .show_host_node_name = 1,
 503         .show_host_port_name = 1,
 504         .show_host_permanent_port_name = 1,
 505         .show_host_supported_classes = 1,
 506         .show_host_supported_speeds = 1,
 507         .show_host_maxframe_size = 1,
 508         .show_host_serial_number = 1,
 509         .get_fc_host_stats = zfcp_get_fc_host_stats,
 510         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 511         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
 512         .get_host_port_state = zfcp_get_host_port_state,
 513         .show_host_port_state = 1,
 514         /* no functions registered for following dynamic attributes but
 515            directly set by LLDD */
 516         .show_host_port_type = 1,
 517         .show_host_speed = 1,
 518         .show_host_port_id = 1,
 519         .disable_target_scan = 1,
 520 };
 521
 522 struct zfcp_data zfcp_data = {
 523         .scsi_host_template = {
 524                 .name                    = "zfcp",
 525                 .module                  = THIS_MODULE,
 526                 .proc_name               = "zfcp",
 527                 .slave_alloc             = zfcp_scsi_slave_alloc,
 528                 .slave_configure         = zfcp_scsi_slave_configure,
 529                 .slave_destroy           = zfcp_scsi_slave_destroy,
 530                 .queuecommand            = zfcp_scsi_queuecommand,
 531                 .eh_abort_handler        = zfcp_scsi_eh_abort_handler,
 532                 .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
 533                 .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
 534                 .eh_host_reset_handler   = zfcp_scsi_eh_host_reset_handler,
 535                 .can_queue               = 4096,
 536                 .this_id                 = -1,
 537                 .sg_tablesize            = ZFCP_MAX_SBALES_PER_REQ,
 538                 .cmd_per_lun             = 1,
 539                 .use_clustering          = 1,
 540                 .sdev_attrs              = zfcp_sysfs_sdev_attrs,
 541                 .max_sectors             = (ZFCP_MAX_SBALES_PER_REQ * 8),
 542                 .shost_attrs             = zfcp_sysfs_shost_attrs,
 543         },
 544 };