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(unit, scpnt);
  91         if (unlikely(ret == -EBUSY))
  92                 return SCSI_MLQUEUE_DEVICE_BUSY;
  93         else if (unlikely(ret < 0))
  94                 return SCSI_MLQUEUE_HOST_BUSY;
  95
  96         return ret;
  97 }
  98
  99 static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *adapter,
 100                                           int channel, unsigned int id,
 101                                           unsigned int lun)
 102 {
 103         struct zfcp_port *port;
 104         struct zfcp_unit *unit;
 105         int scsi_lun;
 106
 107         list_for_each_entry(port, &adapter->port_list_head, list) {
 108                 if (!port->rport || (id != port->rport->scsi_target_id))
 109                         continue;
 110                 list_for_each_entry(unit, &port->unit_list_head, list) {
 111                         scsi_lun = scsilun_to_int(
 112                                 (struct scsi_lun *)&unit->fcp_lun);
 113                         if (lun == scsi_lun)
 114                                 return unit;
 115                 }
 116         }
 117
 118         return NULL;
 119 }
 120
 121 static int zfcp_scsi_slave_alloc(struct scsi_device *sdp)
 122 {
 123         struct zfcp_adapter *adapter;
 124         struct zfcp_unit *unit;
 125         unsigned long flags;
 126         int retval = -ENXIO;
 127
 128         adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
 129         if (!adapter)
 130                 goto out;
 131
 132         read_lock_irqsave(&zfcp_data.config_lock, flags);
 133         unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun);
 134         if (unit) {
 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 = scpnt->device->host;
 148         struct zfcp_adapter *adapter =
 149                 (struct zfcp_adapter *) scsi_host->hostdata[0];
 150         struct zfcp_unit *unit = scpnt->device->hostdata;
 151         struct zfcp_fsf_req *old_req, *abrt_req;
 152         unsigned long flags;
 153         unsigned long old_req_id = (unsigned long) scpnt->host_scribble;
 154         int retval = SUCCESS;
 155         int retry = 3;
 156
 157         /* avoid race condition between late normal completion and abort */
 158         write_lock_irqsave(&adapter->abort_lock, flags);
 159
 160         spin_lock(&adapter->req_list_lock);
 161         old_req = zfcp_reqlist_find(adapter, old_req_id);
 162         spin_unlock(&adapter->req_list_lock);
 163         if (!old_req) {
 164                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 165                 zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, NULL,
 166                                           old_req_id);
 167                 return SUCCESS;
 168         }
 169         old_req->data = NULL;
 170
 171         /* don't access old fsf_req after releasing the abort_lock */
 172         write_unlock_irqrestore(&adapter->abort_lock, flags);
 173
 174         while (retry--) {
 175                 abrt_req = zfcp_fsf_abort_fcp_command(old_req_id, unit);
 176                 if (abrt_req)
 177                         break;
 178
 179                 zfcp_erp_wait(adapter);
 180                 if (!(atomic_read(&adapter->status) &
 181                       ZFCP_STATUS_COMMON_RUNNING)) {
 182                         zfcp_scsi_dbf_event_abort("nres", adapter, scpnt, NULL,
 183                                                   old_req_id);
 184                         return SUCCESS;
 185                 }
 186         }
 187         if (!abrt_req)
 188                 return FAILED;
 189
 190         wait_event(abrt_req->completion_wq,
 191                    abrt_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 192
 193         if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED)
 194                 zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, abrt_req, 0);
 195         else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED)
 196                 zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, abrt_req, 0);
 197         else {
 198                 zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, abrt_req, 0);
 199                 retval = FAILED;
 200         }
 201         zfcp_fsf_req_free(abrt_req);
 202         return retval;
 203 }
 204
 205 static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags)
 206 {
 207         struct zfcp_unit *unit = scpnt->device->hostdata;
 208         struct zfcp_adapter *adapter = unit->port->adapter;
 209         struct zfcp_fsf_req *fsf_req;
 210         int retval = SUCCESS;
 211         int retry = 3;
 212
 213         while (retry--) {
 214                 fsf_req = zfcp_fsf_send_fcp_ctm(unit, tm_flags);
 215                 if (fsf_req)
 216                         break;
 217
 218                 zfcp_erp_wait(adapter);
 219                 if (!(atomic_read(&adapter->status) &
 220                       ZFCP_STATUS_COMMON_RUNNING)) {
 221                         zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit,
 222                                                      scpnt);
 223                         return SUCCESS;
 224                 }
 225         }
 226         if (!fsf_req)
 227                 return FAILED;
 228
 229         wait_event(fsf_req->completion_wq,
 230                    fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 231
 232         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 233                 zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt);
 234                 retval = FAILED;
 235         } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) {
 236                 zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt);
 237                 retval = FAILED;
 238         } else
 239                 zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt);
 240
 241         zfcp_fsf_req_free(fsf_req);
 242         return retval;
 243 }
 244
 245 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 246 {
 247         return zfcp_task_mgmt_function(scpnt, FCP_LOGICAL_UNIT_RESET);
 248 }
 249
 250 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
 251 {
 252         return zfcp_task_mgmt_function(scpnt, FCP_TARGET_RESET);
 253 }
 254
 255 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 256 {
 257         struct zfcp_unit *unit = scpnt->device->hostdata;
 258         struct zfcp_adapter *adapter = unit->port->adapter;
 259
 260         zfcp_erp_adapter_reopen(adapter, 0, 141, scpnt);
 261         zfcp_erp_wait(adapter);
 262
 263         return SUCCESS;
 264 }
 265
 266 int zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
 267 {
 268         struct ccw_dev_id dev_id;
 269
 270         if (adapter->scsi_host)
 271                 return 0;
 272
 273         ccw_device_get_id(adapter->ccw_device, &dev_id);
 274         /* register adapter as SCSI host with mid layer of SCSI stack */
 275         adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
 276                                              sizeof (struct zfcp_adapter *));
 277         if (!adapter->scsi_host) {
 278                 dev_err(&adapter->ccw_device->dev,
 279                         "Registering the FCP device with the "
 280                         "SCSI stack failed\n");
 281                 return -EIO;
 282         }
 283
 284         /* tell the SCSI stack some characteristics of this adapter */
 285         adapter->scsi_host->max_id = 1;
 286         adapter->scsi_host->max_lun = 1;
 287         adapter->scsi_host->max_channel = 0;
 288         adapter->scsi_host->unique_id = dev_id.devno;
 289         adapter->scsi_host->max_cmd_len = 255;
 290         adapter->scsi_host->transportt = zfcp_data.scsi_transport_template;
 291
 292         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 293
 294         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 295                 scsi_host_put(adapter->scsi_host);
 296                 return -EIO;
 297         }
 298
 299         return 0;
 300 }
 301
 302 void zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
 303 {
 304         struct Scsi_Host *shost;
 305         struct zfcp_port *port;
 306
 307         shost = adapter->scsi_host;
 308         if (!shost)
 309                 return;
 310
 311         read_lock_irq(&zfcp_data.config_lock);
 312         list_for_each_entry(port, &adapter->port_list_head, list)
 313                 if (port->rport)
 314                         port->rport = NULL;
 315
 316         read_unlock_irq(&zfcp_data.config_lock);
 317         fc_remove_host(shost);
 318         scsi_remove_host(shost);
 319         scsi_host_put(shost);
 320         adapter->scsi_host = NULL;
 321
 322         return;
 323 }
 324
 325 static struct fc_host_statistics*
 326 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 327 {
 328         struct fc_host_statistics *fc_stats;
 329
 330         if (!adapter->fc_stats) {
 331                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 332                 if (!fc_stats)
 333                         return NULL;
 334                 adapter->fc_stats = fc_stats; /* freed in adater_dequeue */
 335         }
 336         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 337         return adapter->fc_stats;
 338 }
 339
 340 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 341                                       struct fsf_qtcb_bottom_port *data,
 342                                       struct fsf_qtcb_bottom_port *old)
 343 {
 344         fc_stats->seconds_since_last_reset =
 345                 data->seconds_since_last_reset - old->seconds_since_last_reset;
 346         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 347         fc_stats->tx_words = data->tx_words - old->tx_words;
 348         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 349         fc_stats->rx_words = data->rx_words - old->rx_words;
 350         fc_stats->lip_count = data->lip - old->lip;
 351         fc_stats->nos_count = data->nos - old->nos;
 352         fc_stats->error_frames = data->error_frames - old->error_frames;
 353         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 354         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 355         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 356         fc_stats->loss_of_signal_count =
 357                 data->loss_of_signal - old->loss_of_signal;
 358         fc_stats->prim_seq_protocol_err_count =
 359                 data->psp_error_counts - old->psp_error_counts;
 360         fc_stats->invalid_tx_word_count =
 361                 data->invalid_tx_words - old->invalid_tx_words;
 362         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 363         fc_stats->fcp_input_requests =
 364                 data->input_requests - old->input_requests;
 365         fc_stats->fcp_output_requests =
 366                 data->output_requests - old->output_requests;
 367         fc_stats->fcp_control_requests =
 368                 data->control_requests - old->control_requests;
 369         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 370         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 371 }
 372
 373 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 374                                    struct fsf_qtcb_bottom_port *data)
 375 {
 376         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 377         fc_stats->tx_frames = data->tx_frames;
 378         fc_stats->tx_words = data->tx_words;
 379         fc_stats->rx_frames = data->rx_frames;
 380         fc_stats->rx_words = data->rx_words;
 381         fc_stats->lip_count = data->lip;
 382         fc_stats->nos_count = data->nos;
 383         fc_stats->error_frames = data->error_frames;
 384         fc_stats->dumped_frames = data->dumped_frames;
 385         fc_stats->link_failure_count = data->link_failure;
 386         fc_stats->loss_of_sync_count = data->loss_of_sync;
 387         fc_stats->loss_of_signal_count = data->loss_of_signal;
 388         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 389         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 390         fc_stats->invalid_crc_count = data->invalid_crcs;
 391         fc_stats->fcp_input_requests = data->input_requests;
 392         fc_stats->fcp_output_requests = data->output_requests;
 393         fc_stats->fcp_control_requests = data->control_requests;
 394         fc_stats->fcp_input_megabytes = data->input_mb;
 395         fc_stats->fcp_output_megabytes = data->output_mb;
 396 }
 397
 398 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
 399 {
 400         struct zfcp_adapter *adapter;
 401         struct fc_host_statistics *fc_stats;
 402         struct fsf_qtcb_bottom_port *data;
 403         int ret;
 404
 405         adapter = (struct zfcp_adapter *)host->hostdata[0];
 406         fc_stats = zfcp_init_fc_host_stats(adapter);
 407         if (!fc_stats)
 408                 return NULL;
 409
 410         data = kzalloc(sizeof(*data), GFP_KERNEL);
 411         if (!data)
 412                 return NULL;
 413
 414         ret = zfcp_fsf_exchange_port_data_sync(adapter, data);
 415         if (ret) {
 416                 kfree(data);
 417                 return NULL;
 418         }
 419
 420         if (adapter->stats_reset &&
 421             ((jiffies/HZ - adapter->stats_reset) <
 422              data->seconds_since_last_reset))
 423                 zfcp_adjust_fc_host_stats(fc_stats, data,
 424                                           adapter->stats_reset_data);
 425         else
 426                 zfcp_set_fc_host_stats(fc_stats, data);
 427
 428         kfree(data);
 429         return fc_stats;
 430 }
 431
 432 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 433 {
 434         struct zfcp_adapter *adapter;
 435         struct fsf_qtcb_bottom_port *data;
 436         int ret;
 437
 438         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 439         data = kzalloc(sizeof(*data), GFP_KERNEL);
 440         if (!data)
 441                 return;
 442
 443         ret = zfcp_fsf_exchange_port_data_sync(adapter, data);
 444         if (ret)
 445                 kfree(data);
 446         else {
 447                 adapter->stats_reset = jiffies/HZ;
 448                 kfree(adapter->stats_reset_data);
 449                 adapter->stats_reset_data = data; /* finally freed in
 450                                                      adapter_dequeue */
 451         }
 452 }
 453
 454 static void zfcp_get_host_port_state(struct Scsi_Host *shost)
 455 {
 456         struct zfcp_adapter *adapter =
 457                 (struct zfcp_adapter *)shost->hostdata[0];
 458         int status = atomic_read(&adapter->status);
 459
 460         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
 461             !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
 462                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
 463         else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 464                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
 465         else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
 466                 fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
 467         else
 468                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
 469 }
 470
 471 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
 472 {
 473         rport->dev_loss_tmo = timeout;
 474 }
 475
 476 struct fc_function_template zfcp_transport_functions = {
 477         .show_starget_port_id = 1,
 478         .show_starget_port_name = 1,
 479         .show_starget_node_name = 1,
 480         .show_rport_supported_classes = 1,
 481         .show_rport_maxframe_size = 1,
 482         .show_rport_dev_loss_tmo = 1,
 483         .show_host_node_name = 1,
 484         .show_host_port_name = 1,
 485         .show_host_permanent_port_name = 1,
 486         .show_host_supported_classes = 1,
 487         .show_host_supported_speeds = 1,
 488         .show_host_maxframe_size = 1,
 489         .show_host_serial_number = 1,
 490         .get_fc_host_stats = zfcp_get_fc_host_stats,
 491         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 492         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
 493         .get_host_port_state = zfcp_get_host_port_state,
 494         .show_host_port_state = 1,
 495         /* no functions registered for following dynamic attributes but
 496            directly set by LLDD */
 497         .show_host_port_type = 1,
 498         .show_host_speed = 1,
 499         .show_host_port_id = 1,
 500         .disable_target_scan = 1,
 501 };
 502
 503 struct zfcp_data zfcp_data = {
 504         .scsi_host_template = {
 505                 .name                    = "zfcp",
 506                 .module                  = THIS_MODULE,
 507                 .proc_name               = "zfcp",
 508                 .slave_alloc             = zfcp_scsi_slave_alloc,
 509                 .slave_configure         = zfcp_scsi_slave_configure,
 510                 .slave_destroy           = zfcp_scsi_slave_destroy,
 511                 .queuecommand            = zfcp_scsi_queuecommand,
 512                 .eh_abort_handler        = zfcp_scsi_eh_abort_handler,
 513                 .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
 514                 .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
 515                 .eh_host_reset_handler   = zfcp_scsi_eh_host_reset_handler,
 516                 .can_queue               = 4096,
 517                 .this_id                 = -1,
 518                 .sg_tablesize            = ZFCP_MAX_SBALES_PER_REQ,
 519                 .cmd_per_lun             = 1,
 520                 .use_clustering          = 1,
 521                 .sdev_attrs              = zfcp_sysfs_sdev_attrs,
 522                 .max_sectors             = (ZFCP_MAX_SBALES_PER_REQ * 8),
 523                 .shost_attrs             = zfcp_sysfs_shost_attrs,
 524         },
 525 };