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