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