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