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 = 0;
 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_command_task_management
 224                 (adapter, unit, tm_flags, 0);
 225         if (!fsf_req) {
 226                 zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit, scpnt);
 227                 return FAILED;
 228         }
 229
 230         __wait_event(fsf_req->completion_wq,
 231                      fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 232
 233         /*
 234          * check completion status of task management function
 235          */
 236         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 237                 zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt);
 238                 retval = FAILED;
 239         } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) {
 240                 zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt);
 241                 retval = FAILED;
 242         } else
 243                 zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt);
 244
 245         zfcp_fsf_req_free(fsf_req);
 246
 247         return retval;
 248 }
 249
 250 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 251 {
 252         struct zfcp_unit *unit = scpnt->device->hostdata;
 253
 254         if (!unit) {
 255                 WARN_ON(1);
 256                 return SUCCESS;
 257         }
 258         return zfcp_task_mgmt_function(unit, FCP_LOGICAL_UNIT_RESET, scpnt);
 259 }
 260
 261 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
 262 {
 263         struct zfcp_unit *unit = scpnt->device->hostdata;
 264
 265         if (!unit) {
 266                 WARN_ON(1);
 267                 return SUCCESS;
 268         }
 269         return zfcp_task_mgmt_function(unit, FCP_TARGET_RESET, scpnt);
 270 }
 271
 272 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 273 {
 274         struct zfcp_unit *unit;
 275         struct zfcp_adapter *adapter;
 276
 277         unit = scpnt->device->hostdata;
 278         adapter = unit->port->adapter;
 279         zfcp_erp_adapter_reopen(adapter, 0, 141, scpnt);
 280         zfcp_erp_wait(adapter);
 281
 282         return SUCCESS;
 283 }
 284
 285 int zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
 286 {
 287         struct ccw_dev_id dev_id;
 288
 289         if (adapter->scsi_host)
 290                 return 0;
 291
 292         ccw_device_get_id(adapter->ccw_device, &dev_id);
 293         /* register adapter as SCSI host with mid layer of SCSI stack */
 294         adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
 295                                              sizeof (struct zfcp_adapter *));
 296         if (!adapter->scsi_host) {
 297                 dev_err(&adapter->ccw_device->dev,
 298                         "registration with SCSI stack failed.");
 299                 return -EIO;
 300         }
 301
 302         /* tell the SCSI stack some characteristics of this adapter */
 303         adapter->scsi_host->max_id = 1;
 304         adapter->scsi_host->max_lun = 1;
 305         adapter->scsi_host->max_channel = 0;
 306         adapter->scsi_host->unique_id = dev_id.devno;
 307         adapter->scsi_host->max_cmd_len = 255;
 308         adapter->scsi_host->transportt = zfcp_data.scsi_transport_template;
 309
 310         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 311
 312         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 313                 scsi_host_put(adapter->scsi_host);
 314                 return -EIO;
 315         }
 316         atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
 317
 318         return 0;
 319 }
 320
 321 void zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
 322 {
 323         struct Scsi_Host *shost;
 324         struct zfcp_port *port;
 325
 326         shost = adapter->scsi_host;
 327         if (!shost)
 328                 return;
 329
 330         read_lock_irq(&zfcp_data.config_lock);
 331         list_for_each_entry(port, &adapter->port_list_head, list)
 332                 if (port->rport)
 333                         port->rport = NULL;
 334
 335         read_unlock_irq(&zfcp_data.config_lock);
 336         fc_remove_host(shost);
 337         scsi_remove_host(shost);
 338         scsi_host_put(shost);
 339         adapter->scsi_host = NULL;
 340         atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
 341
 342         return;
 343 }
 344
 345 static struct fc_host_statistics*
 346 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 347 {
 348         struct fc_host_statistics *fc_stats;
 349
 350         if (!adapter->fc_stats) {
 351                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 352                 if (!fc_stats)
 353                         return NULL;
 354                 adapter->fc_stats = fc_stats; /* freed in adater_dequeue */
 355         }
 356         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 357         return adapter->fc_stats;
 358 }
 359
 360 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 361                                       struct fsf_qtcb_bottom_port *data,
 362                                       struct fsf_qtcb_bottom_port *old)
 363 {
 364         fc_stats->seconds_since_last_reset =
 365                 data->seconds_since_last_reset - old->seconds_since_last_reset;
 366         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 367         fc_stats->tx_words = data->tx_words - old->tx_words;
 368         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 369         fc_stats->rx_words = data->rx_words - old->rx_words;
 370         fc_stats->lip_count = data->lip - old->lip;
 371         fc_stats->nos_count = data->nos - old->nos;
 372         fc_stats->error_frames = data->error_frames - old->error_frames;
 373         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 374         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 375         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 376         fc_stats->loss_of_signal_count =
 377                 data->loss_of_signal - old->loss_of_signal;
 378         fc_stats->prim_seq_protocol_err_count =
 379                 data->psp_error_counts - old->psp_error_counts;
 380         fc_stats->invalid_tx_word_count =
 381                 data->invalid_tx_words - old->invalid_tx_words;
 382         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 383         fc_stats->fcp_input_requests =
 384                 data->input_requests - old->input_requests;
 385         fc_stats->fcp_output_requests =
 386                 data->output_requests - old->output_requests;
 387         fc_stats->fcp_control_requests =
 388                 data->control_requests - old->control_requests;
 389         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 390         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 391 }
 392
 393 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 394                                    struct fsf_qtcb_bottom_port *data)
 395 {
 396         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 397         fc_stats->tx_frames = data->tx_frames;
 398         fc_stats->tx_words = data->tx_words;
 399         fc_stats->rx_frames = data->rx_frames;
 400         fc_stats->rx_words = data->rx_words;
 401         fc_stats->lip_count = data->lip;
 402         fc_stats->nos_count = data->nos;
 403         fc_stats->error_frames = data->error_frames;
 404         fc_stats->dumped_frames = data->dumped_frames;
 405         fc_stats->link_failure_count = data->link_failure;
 406         fc_stats->loss_of_sync_count = data->loss_of_sync;
 407         fc_stats->loss_of_signal_count = data->loss_of_signal;
 408         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 409         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 410         fc_stats->invalid_crc_count = data->invalid_crcs;
 411         fc_stats->fcp_input_requests = data->input_requests;
 412         fc_stats->fcp_output_requests = data->output_requests;
 413         fc_stats->fcp_control_requests = data->control_requests;
 414         fc_stats->fcp_input_megabytes = data->input_mb;
 415         fc_stats->fcp_output_megabytes = data->output_mb;
 416 }
 417
 418 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
 419 {
 420         struct zfcp_adapter *adapter;
 421         struct fc_host_statistics *fc_stats;
 422         struct fsf_qtcb_bottom_port *data;
 423         int ret;
 424
 425         adapter = (struct zfcp_adapter *)host->hostdata[0];
 426         fc_stats = zfcp_init_fc_host_stats(adapter);
 427         if (!fc_stats)
 428                 return NULL;
 429
 430         data = kzalloc(sizeof(*data), GFP_KERNEL);
 431         if (!data)
 432                 return NULL;
 433
 434         ret = zfcp_fsf_exchange_port_data_sync(adapter, data);
 435         if (ret) {
 436                 kfree(data);
 437                 return NULL;
 438         }
 439
 440         if (adapter->stats_reset &&
 441             ((jiffies/HZ - adapter->stats_reset) <
 442              data->seconds_since_last_reset))
 443                 zfcp_adjust_fc_host_stats(fc_stats, data,
 444                                           adapter->stats_reset_data);
 445         else
 446                 zfcp_set_fc_host_stats(fc_stats, data);
 447
 448         kfree(data);
 449         return fc_stats;
 450 }
 451
 452 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 453 {
 454         struct zfcp_adapter *adapter;
 455         struct fsf_qtcb_bottom_port *data;
 456         int ret;
 457
 458         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 459         data = kzalloc(sizeof(*data), GFP_KERNEL);
 460         if (!data)
 461                 return;
 462
 463         ret = zfcp_fsf_exchange_port_data_sync(adapter, data);
 464         if (ret)
 465                 kfree(data);
 466         else {
 467                 adapter->stats_reset = jiffies/HZ;
 468                 kfree(adapter->stats_reset_data);
 469                 adapter->stats_reset_data = data; /* finally freed in
 470                                                      adapter_dequeue */
 471         }
 472 }
 473
 474 static void zfcp_get_host_port_state(struct Scsi_Host *shost)
 475 {
 476         struct zfcp_adapter *adapter =
 477                 (struct zfcp_adapter *)shost->hostdata[0];
 478         int status = atomic_read(&adapter->status);
 479
 480         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
 481             !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
 482                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
 483         else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 484                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
 485         else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
 486                 fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
 487         else
 488                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
 489 }
 490
 491 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
 492 {
 493         rport->dev_loss_tmo = timeout;
 494 }
 495
 496 struct fc_function_template zfcp_transport_functions = {
 497         .show_starget_port_id = 1,
 498         .show_starget_port_name = 1,
 499         .show_starget_node_name = 1,
 500         .show_rport_supported_classes = 1,
 501         .show_rport_maxframe_size = 1,
 502         .show_rport_dev_loss_tmo = 1,
 503         .show_host_node_name = 1,
 504         .show_host_port_name = 1,
 505         .show_host_permanent_port_name = 1,
 506         .show_host_supported_classes = 1,
 507         .show_host_supported_speeds = 1,
 508         .show_host_maxframe_size = 1,
 509         .show_host_serial_number = 1,
 510         .get_fc_host_stats = zfcp_get_fc_host_stats,
 511         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 512         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
 513         .get_host_port_state = zfcp_get_host_port_state,
 514         .show_host_port_state = 1,
 515         /* no functions registered for following dynamic attributes but
 516            directly set by LLDD */
 517         .show_host_port_type = 1,
 518         .show_host_speed = 1,
 519         .show_host_port_id = 1,
 520         .disable_target_scan = 1,
 521 };
 522
 523 #define ZFCP_DEFINE_LATENCY_ATTR(_name)                                 \
 524 static ssize_t                                                          \
 525 zfcp_sysfs_unit_##_name##_latency_show(struct device *dev,              \
 526                                        struct device_attribute *attr,   \
 527                                        char *buf) {                     \
 528         struct scsi_device *sdev = to_scsi_device(dev);                 \
 529         struct zfcp_unit *unit = sdev->hostdata;                        \
 530         struct zfcp_latencies *lat = &unit->latencies;                  \
 531         struct zfcp_adapter *adapter = unit->port->adapter;             \
 532         unsigned long flags;                                            \
 533         unsigned long long fsum, fmin, fmax, csum, cmin, cmax, cc;      \
 534                                                                         \
 535         spin_lock_irqsave(&lat->lock, flags);                           \
 536         fsum = lat->_name.fabric.sum * adapter->timer_ticks;            \
 537         fmin = lat->_name.fabric.min * adapter->timer_ticks;            \
 538         fmax = lat->_name.fabric.max * adapter->timer_ticks;            \
 539         csum = lat->_name.channel.sum * adapter->timer_ticks;           \
 540         cmin = lat->_name.channel.min * adapter->timer_ticks;           \
 541         cmax = lat->_name.channel.max * adapter->timer_ticks;           \
 542         cc  = lat->_name.counter;                                       \
 543         spin_unlock_irqrestore(&lat->lock, flags);                      \
 544                                                                         \
 545         do_div(fsum, 1000);                                             \
 546         do_div(fmin, 1000);                                             \
 547         do_div(fmax, 1000);                                             \
 548         do_div(csum, 1000);                                             \
 549         do_div(cmin, 1000);                                             \
 550         do_div(cmax, 1000);                                             \
 551                                                                         \
 552         return sprintf(buf, "%llu %llu %llu %llu %llu %llu %llu\n",     \
 553                        fmin, fmax, fsum, cmin, cmax, csum, cc);         \
 554 }                                                                       \
 555 static ssize_t                                                          \
 556 zfcp_sysfs_unit_##_name##_latency_store(struct device *dev,             \
 557                                         struct device_attribute *attr,  \
 558                                         const char *buf, size_t count)  \
 559 {                                                                       \
 560         struct scsi_device *sdev = to_scsi_device(dev);                 \
 561         struct zfcp_unit *unit = sdev->hostdata;                        \
 562         struct zfcp_latencies *lat = &unit->latencies;                  \
 563         unsigned long flags;                                            \
 564                                                                         \
 565         spin_lock_irqsave(&lat->lock, flags);                           \
 566         lat->_name.fabric.sum = 0;                                      \
 567         lat->_name.fabric.min = 0xFFFFFFFF;                             \
 568         lat->_name.fabric.max = 0;                                      \
 569         lat->_name.channel.sum = 0;                                     \
 570         lat->_name.channel.min = 0xFFFFFFFF;                            \
 571         lat->_name.channel.max = 0;                                     \
 572         lat->_name.counter = 0;                                         \
 573         spin_unlock_irqrestore(&lat->lock, flags);                      \
 574                                                                         \
 575         return (ssize_t) count;                                         \
 576 }                                                                       \
 577 static DEVICE_ATTR(_name##_latency, S_IWUSR | S_IRUGO,                  \
 578                    zfcp_sysfs_unit_##_name##_latency_show,              \
 579                    zfcp_sysfs_unit_##_name##_latency_store);
 580
 581 ZFCP_DEFINE_LATENCY_ATTR(read);
 582 ZFCP_DEFINE_LATENCY_ATTR(write);
 583 ZFCP_DEFINE_LATENCY_ATTR(cmd);
 584
 585 #define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value)                    \
 586 static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, struct device_attribute *attr,        \
 587                                               char *buf)                 \
 588 {                                                                        \
 589         struct scsi_device *sdev;                                        \
 590         struct zfcp_unit *unit;                                          \
 591                                                                          \
 592         sdev = to_scsi_device(dev);                                      \
 593         unit = sdev->hostdata;                                           \
 594         return sprintf(buf, _format, _value);                            \
 595 }                                                                        \
 596                                                                          \
 597 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL);
 598
 599 ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n",
 600         unit->port->adapter->ccw_device->dev.bus_id);
 601 ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn);
 602 ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun);
 603
 604 static struct device_attribute *zfcp_sysfs_sdev_attrs[] = {
 605         &dev_attr_fcp_lun,
 606         &dev_attr_wwpn,
 607         &dev_attr_hba_id,
 608         &dev_attr_read_latency,
 609         &dev_attr_write_latency,
 610         &dev_attr_cmd_latency,
 611         NULL
 612 };
 613
 614 static ssize_t zfcp_sysfs_adapter_util_show(struct device *dev,
 615                                             struct device_attribute *attr,
 616                                             char *buf)
 617 {
 618         struct Scsi_Host *scsi_host = dev_to_shost(dev);
 619         struct fsf_qtcb_bottom_port *qtcb_port;
 620         struct zfcp_adapter *adapter;
 621         int retval;
 622
 623         adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
 624         if (!(adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA))
 625                 return -EOPNOTSUPP;
 626
 627         qtcb_port = kzalloc(sizeof(struct fsf_qtcb_bottom_port), GFP_KERNEL);
 628         if (!qtcb_port)
 629                 return -ENOMEM;
 630
 631         retval = zfcp_fsf_exchange_port_data_sync(adapter, qtcb_port);
 632         if (!retval)
 633                 retval = sprintf(buf, "%u %u %u\n", qtcb_port->cp_util,
 634                                  qtcb_port->cb_util, qtcb_port->a_util);
 635         kfree(qtcb_port);
 636         return retval;
 637 }
 638
 639 static int zfcp_sysfs_adapter_ex_config(struct device *dev,
 640                                         struct fsf_statistics_info *stat_inf)
 641 {
 642         struct Scsi_Host *scsi_host = dev_to_shost(dev);
 643         struct fsf_qtcb_bottom_config *qtcb_config;
 644         struct zfcp_adapter *adapter;
 645         int retval;
 646
 647         adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
 648         if (!(adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA))
 649                 return -EOPNOTSUPP;
 650
 651         qtcb_config = kzalloc(sizeof(struct fsf_qtcb_bottom_config),
 652                               GFP_KERNEL);
 653         if (!qtcb_config)
 654                 return -ENOMEM;
 655
 656         retval = zfcp_fsf_exchange_config_data_sync(adapter, qtcb_config);
 657         if (!retval)
 658                 *stat_inf = qtcb_config->stat_info;
 659
 660         kfree(qtcb_config);
 661         return retval;
 662 }
 663
 664 static ssize_t zfcp_sysfs_adapter_request_show(struct device *dev,
 665                                                struct device_attribute *attr,
 666                                                char *buf)
 667 {
 668         struct fsf_statistics_info stat_info;
 669         int retval;
 670
 671         retval = zfcp_sysfs_adapter_ex_config(dev, &stat_info);
 672         if (retval)
 673                 return retval;
 674
 675         return sprintf(buf, "%llu %llu %llu\n",
 676                        (unsigned long long) stat_info.input_req,
 677                        (unsigned long long) stat_info.output_req,
 678                        (unsigned long long) stat_info.control_req);
 679 }
 680
 681 static ssize_t zfcp_sysfs_adapter_mb_show(struct device *dev,
 682                                           struct device_attribute *attr,
 683                                           char *buf)
 684 {
 685         struct fsf_statistics_info stat_info;
 686         int retval;
 687
 688         retval = zfcp_sysfs_adapter_ex_config(dev, &stat_info);
 689         if (retval)
 690                 return retval;
 691
 692         return sprintf(buf, "%llu %llu\n",
 693                        (unsigned long long) stat_info.input_mb,
 694                        (unsigned long long) stat_info.output_mb);
 695 }
 696
 697 static ssize_t zfcp_sysfs_adapter_sec_active_show(struct device *dev,
 698                                                   struct device_attribute *attr,
 699                                                   char *buf)
 700 {
 701         struct fsf_statistics_info stat_info;
 702         int retval;
 703
 704         retval = zfcp_sysfs_adapter_ex_config(dev, &stat_info);
 705         if (retval)
 706                 return retval;
 707
 708         return sprintf(buf, "%llu\n",
 709                        (unsigned long long) stat_info.seconds_act);
 710 }
 711
 712 static DEVICE_ATTR(utilization, S_IRUGO, zfcp_sysfs_adapter_util_show, NULL);
 713 static DEVICE_ATTR(requests, S_IRUGO, zfcp_sysfs_adapter_request_show, NULL);
 714 static DEVICE_ATTR(megabytes, S_IRUGO, zfcp_sysfs_adapter_mb_show, NULL);
 715 static DEVICE_ATTR(seconds_active, S_IRUGO,
 716                    zfcp_sysfs_adapter_sec_active_show, NULL);
 717
 718 static struct device_attribute *zfcp_a_stats_attrs[] = {
 719         &dev_attr_utilization,
 720         &dev_attr_requests,
 721         &dev_attr_megabytes,
 722         &dev_attr_seconds_active,
 723         NULL
 724 };
 725
 726 struct zfcp_data zfcp_data = {
 727         .scsi_host_template = {
 728                 .name                    = "zfcp",
 729                 .module                  = THIS_MODULE,
 730                 .proc_name               = "zfcp",
 731                 .slave_alloc             = zfcp_scsi_slave_alloc,
 732                 .slave_configure         = zfcp_scsi_slave_configure,
 733                 .slave_destroy           = zfcp_scsi_slave_destroy,
 734                 .queuecommand            = zfcp_scsi_queuecommand,
 735                 .eh_abort_handler        = zfcp_scsi_eh_abort_handler,
 736                 .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
 737                 .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
 738                 .eh_host_reset_handler   = zfcp_scsi_eh_host_reset_handler,
 739                 .can_queue               = 4096,
 740                 .this_id                 = -1,
 741                 .sg_tablesize            = ZFCP_MAX_SBALES_PER_REQ,
 742                 .cmd_per_lun             = 1,
 743                 .use_clustering          = 1,
 744                 .sdev_attrs              = zfcp_sysfs_sdev_attrs,
 745                 .max_sectors             = (ZFCP_MAX_SBALES_PER_REQ * 8),
 746                 .shost_attrs             = zfcp_a_stats_attrs,
 747         },
 748 };
 749