drivers/scsi/isci/init.c

   1 /*
   2  * This file is provided under a dual BSD/GPLv2 license.  When using or
   3  * redistributing this file, you may do so under either license.
   4  *
   5  * GPL LICENSE SUMMARY
   6  *
   7  * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of version 2 of the GNU General Public License as
  11  * published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  21  * The full GNU General Public License is included in this distribution
  22  * in the file called LICENSE.GPL.
  23  *
  24  * BSD LICENSE
  25  *
  26  * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
  27  * All rights reserved.
  28  *
  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
  31  * are met:
  32  *
  33  *   * Redistributions of source code must retain the above copyright
  34  *     notice, this list of conditions and the following disclaimer.
  35  *   * Redistributions in binary form must reproduce the above copyright
  36  *     notice, this list of conditions and the following disclaimer in
  37  *     the documentation and/or other materials provided with the
  38  *     distribution.
  39  *   * Neither the name of Intel Corporation nor the names of its
  40  *     contributors may be used to endorse or promote products derived
  41  *     from this software without specific prior written permission.
  42  *
  43  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  44  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  45  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  46  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  47  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  48  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  49  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  50  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  51  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  52  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  53  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  54  */
  55
  56 #include <linux/kernel.h>
  57 #include <linux/init.h>
  58 #include <linux/module.h>
  59 #include <linux/firmware.h>
  60 #include <linux/efi.h>
  61 #include <asm/string.h>
  62 #include <scsi/scsi_host.h>
  63 #include "isci.h"
  64 #include "task.h"
  65 #include "probe_roms.h"
  66
  67 #define MAJ 1
  68 #define MIN 1
  69 #define BUILD 0
  70 #define DRV_VERSION __stringify(MAJ) "." __stringify(MIN) "." \
  71         __stringify(BUILD)
  72
  73 MODULE_VERSION(DRV_VERSION);
  74
  75 static struct scsi_transport_template *isci_transport_template;
  76
  77 static DEFINE_PCI_DEVICE_TABLE(isci_id_table) = {
  78         { PCI_VDEVICE(INTEL, 0x1D61),},
  79         { PCI_VDEVICE(INTEL, 0x1D63),},
  80         { PCI_VDEVICE(INTEL, 0x1D65),},
  81         { PCI_VDEVICE(INTEL, 0x1D67),},
  82         { PCI_VDEVICE(INTEL, 0x1D69),},
  83         { PCI_VDEVICE(INTEL, 0x1D6B),},
  84         { PCI_VDEVICE(INTEL, 0x1D60),},
  85         { PCI_VDEVICE(INTEL, 0x1D62),},
  86         { PCI_VDEVICE(INTEL, 0x1D64),},
  87         { PCI_VDEVICE(INTEL, 0x1D66),},
  88         { PCI_VDEVICE(INTEL, 0x1D68),},
  89         { PCI_VDEVICE(INTEL, 0x1D6A),},
  90         {}
  91 };
  92
  93 MODULE_DEVICE_TABLE(pci, isci_id_table);
  94
  95 /* linux isci specific settings */
  96
  97 unsigned char no_outbound_task_to = 2;
  98 module_param(no_outbound_task_to, byte, 0);
  99 MODULE_PARM_DESC(no_outbound_task_to, "No Outbound Task Timeout (1us incr)");
 100
 101 u16 ssp_max_occ_to = 20;
 102 module_param(ssp_max_occ_to, ushort, 0);
 103 MODULE_PARM_DESC(ssp_max_occ_to, "SSP Max occupancy timeout (100us incr)");
 104
 105 u16 stp_max_occ_to = 5;
 106 module_param(stp_max_occ_to, ushort, 0);
 107 MODULE_PARM_DESC(stp_max_occ_to, "STP Max occupancy timeout (100us incr)");
 108
 109 u16 ssp_inactive_to = 5;
 110 module_param(ssp_inactive_to, ushort, 0);
 111 MODULE_PARM_DESC(ssp_inactive_to, "SSP inactivity timeout (100us incr)");
 112
 113 u16 stp_inactive_to = 5;
 114 module_param(stp_inactive_to, ushort, 0);
 115 MODULE_PARM_DESC(stp_inactive_to, "STP inactivity timeout (100us incr)");
 116
 117 unsigned char phy_gen = SCIC_SDS_PARM_GEN2_SPEED;
 118 module_param(phy_gen, byte, 0);
 119 MODULE_PARM_DESC(phy_gen, "PHY generation (1: 1.5Gbps 2: 3.0Gbps 3: 6.0Gbps)");
 120
 121 unsigned char max_concurr_spinup;
 122 module_param(max_concurr_spinup, byte, 0);
 123 MODULE_PARM_DESC(max_concurr_spinup, "Max concurrent device spinup");
 124
 125 uint cable_selection_override = CABLE_OVERRIDE_DISABLED;
 126 module_param(cable_selection_override, uint, 0);
 127
 128 MODULE_PARM_DESC(cable_selection_override,
 129                  "This field indicates length of the SAS/SATA cable between "
 130                  "host and device. If any bits > 15 are set (default) "
 131                  "indicates \"use platform defaults\"");
 132
 133 static ssize_t isci_show_id(struct device *dev, struct device_attribute *attr, char *buf)
 134 {
 135         struct Scsi_Host *shost = container_of(dev, typeof(*shost), shost_dev);
 136         struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
 137         struct isci_host *ihost = container_of(sas_ha, typeof(*ihost), sas_ha);
 138
 139         return snprintf(buf, PAGE_SIZE, "%d\n", ihost->id);
 140 }
 141
 142 static DEVICE_ATTR(isci_id, S_IRUGO, isci_show_id, NULL);
 143
 144 struct device_attribute *isci_host_attrs[] = {
 145         &dev_attr_isci_id,
 146         NULL
 147 };
 148
 149 static struct scsi_host_template isci_sht = {
 150
 151         .module                         = THIS_MODULE,
 152         .name                           = DRV_NAME,
 153         .proc_name                      = DRV_NAME,
 154         .queuecommand                   = sas_queuecommand,
 155         .target_alloc                   = sas_target_alloc,
 156         .slave_configure                = sas_slave_configure,
 157         .slave_destroy                  = sas_slave_destroy,
 158         .scan_finished                  = isci_host_scan_finished,
 159         .scan_start                     = isci_host_scan_start,
 160         .change_queue_depth             = sas_change_queue_depth,
 161         .change_queue_type              = sas_change_queue_type,
 162         .bios_param                     = sas_bios_param,
 163         .can_queue                      = ISCI_CAN_QUEUE_VAL,
 164         .cmd_per_lun                    = 1,
 165         .this_id                        = -1,
 166         .sg_tablesize                   = SG_ALL,
 167         .max_sectors                    = SCSI_DEFAULT_MAX_SECTORS,
 168         .use_clustering                 = ENABLE_CLUSTERING,
 169         .eh_device_reset_handler        = sas_eh_device_reset_handler,
 170         .eh_bus_reset_handler           = isci_bus_reset_handler,
 171         .slave_alloc                    = sas_slave_alloc,
 172         .target_destroy                 = sas_target_destroy,
 173         .ioctl                          = sas_ioctl,
 174         .shost_attrs                    = isci_host_attrs,
 175 };
 176
 177 static struct sas_domain_function_template isci_transport_ops  = {
 178
 179         /* The class calls these to notify the LLDD of an event. */
 180         .lldd_port_formed       = isci_port_formed,
 181         .lldd_port_deformed     = isci_port_deformed,
 182
 183         /* The class calls these when a device is found or gone. */
 184         .lldd_dev_found         = isci_remote_device_found,
 185         .lldd_dev_gone          = isci_remote_device_gone,
 186
 187         .lldd_execute_task      = isci_task_execute_task,
 188         /* Task Management Functions. Must be called from process context. */
 189         .lldd_abort_task        = isci_task_abort_task,
 190         .lldd_abort_task_set    = isci_task_abort_task_set,
 191         .lldd_clear_aca         = isci_task_clear_aca,
 192         .lldd_clear_task_set    = isci_task_clear_task_set,
 193         .lldd_I_T_nexus_reset   = isci_task_I_T_nexus_reset,
 194         .lldd_lu_reset          = isci_task_lu_reset,
 195         .lldd_query_task        = isci_task_query_task,
 196
 197         /* Port and Adapter management */
 198         .lldd_clear_nexus_port  = isci_task_clear_nexus_port,
 199         .lldd_clear_nexus_ha    = isci_task_clear_nexus_ha,
 200
 201         /* Phy management */
 202         .lldd_control_phy       = isci_phy_control,
 203
 204         /* GPIO support */
 205         .lldd_write_gpio        = isci_gpio_write,
 206 };
 207
 208
 209 /******************************************************************************
 210 * P R O T E C T E D  M E T H O D S
 211 ******************************************************************************/
 212
 213
 214
 215 /**
 216  * isci_register_sas_ha() - This method initializes various lldd
 217  *    specific members of the sas_ha struct and calls the libsas
 218  *    sas_register_ha() function.
 219  * @isci_host: This parameter specifies the lldd specific wrapper for the
 220  *    libsas sas_ha struct.
 221  *
 222  * This method returns an error code indicating sucess or failure. The user
 223  * should check for possible memory allocation error return otherwise, a zero
 224  * indicates success.
 225  */
 226 static int isci_register_sas_ha(struct isci_host *isci_host)
 227 {
 228         int i;
 229         struct sas_ha_struct *sas_ha = &(isci_host->sas_ha);
 230         struct asd_sas_phy **sas_phys;
 231         struct asd_sas_port **sas_ports;
 232
 233         sas_phys = devm_kzalloc(&isci_host->pdev->dev,
 234                                 SCI_MAX_PHYS * sizeof(void *),
 235                                 GFP_KERNEL);
 236         if (!sas_phys)
 237                 return -ENOMEM;
 238
 239         sas_ports = devm_kzalloc(&isci_host->pdev->dev,
 240                                  SCI_MAX_PORTS * sizeof(void *),
 241                                  GFP_KERNEL);
 242         if (!sas_ports)
 243                 return -ENOMEM;
 244
 245         /*----------------- Libsas Initialization Stuff----------------------
 246          * Set various fields in the sas_ha struct:
 247          */
 248
 249         sas_ha->sas_ha_name = DRV_NAME;
 250         sas_ha->lldd_module = THIS_MODULE;
 251         sas_ha->sas_addr    = &isci_host->phys[0].sas_addr[0];
 252
 253         /* set the array of phy and port structs.  */
 254         for (i = 0; i < SCI_MAX_PHYS; i++) {
 255                 sas_phys[i] = &isci_host->phys[i].sas_phy;
 256                 sas_ports[i] = &isci_host->ports[i].sas_port;
 257         }
 258
 259         sas_ha->sas_phy  = sas_phys;
 260         sas_ha->sas_port = sas_ports;
 261         sas_ha->num_phys = SCI_MAX_PHYS;
 262
 263         sas_ha->lldd_queue_size = ISCI_CAN_QUEUE_VAL;
 264         sas_ha->lldd_max_execute_num = 1;
 265         sas_ha->strict_wide_ports = 1;
 266
 267         sas_register_ha(sas_ha);
 268
 269         return 0;
 270 }
 271
 272 static void isci_unregister(struct isci_host *isci_host)
 273 {
 274         struct Scsi_Host *shost;
 275
 276         if (!isci_host)
 277                 return;
 278
 279         shost = isci_host->shost;
 280
 281         sas_unregister_ha(&isci_host->sas_ha);
 282
 283         sas_remove_host(isci_host->shost);
 284         scsi_remove_host(isci_host->shost);
 285         scsi_host_put(isci_host->shost);
 286 }
 287
 288 static int __devinit isci_pci_init(struct pci_dev *pdev)
 289 {
 290         int err, bar_num, bar_mask = 0;
 291         void __iomem * const *iomap;
 292
 293         err = pcim_enable_device(pdev);
 294         if (err) {
 295                 dev_err(&pdev->dev,
 296                         "failed enable PCI device %s!\n",
 297                         pci_name(pdev));
 298                 return err;
 299         }
 300
 301         for (bar_num = 0; bar_num < SCI_PCI_BAR_COUNT; bar_num++)
 302                 bar_mask |= 1 << (bar_num * 2);
 303
 304         err = pcim_iomap_regions(pdev, bar_mask, DRV_NAME);
 305         if (err)
 306                 return err;
 307
 308         iomap = pcim_iomap_table(pdev);
 309         if (!iomap)
 310                 return -ENOMEM;
 311
 312         pci_set_master(pdev);
 313
 314         err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
 315         if (err) {
 316                 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
 317                 if (err)
 318                         return err;
 319         }
 320
 321         err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
 322         if (err) {
 323                 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
 324                 if (err)
 325                         return err;
 326         }
 327
 328         return 0;
 329 }
 330
 331 static int num_controllers(struct pci_dev *pdev)
 332 {
 333         /* bar size alone can tell us if we are running with a dual controller
 334          * part, no need to trust revision ids that might be under broken firmware
 335          * control
 336          */
 337         resource_size_t scu_bar_size = pci_resource_len(pdev, SCI_SCU_BAR*2);
 338         resource_size_t smu_bar_size = pci_resource_len(pdev, SCI_SMU_BAR*2);
 339
 340         if (scu_bar_size >= SCI_SCU_BAR_SIZE*SCI_MAX_CONTROLLERS &&
 341             smu_bar_size >= SCI_SMU_BAR_SIZE*SCI_MAX_CONTROLLERS)
 342                 return SCI_MAX_CONTROLLERS;
 343         else
 344                 return 1;
 345 }
 346
 347 static int isci_setup_interrupts(struct pci_dev *pdev)
 348 {
 349         int err, i, num_msix;
 350         struct isci_host *ihost;
 351         struct isci_pci_info *pci_info = to_pci_info(pdev);
 352
 353         /*
 354          *  Determine the number of vectors associated with this
 355          *  PCI function.
 356          */
 357         num_msix = num_controllers(pdev) * SCI_NUM_MSI_X_INT;
 358
 359         for (i = 0; i < num_msix; i++)
 360                 pci_info->msix_entries[i].entry = i;
 361
 362         err = pci_enable_msix(pdev, pci_info->msix_entries, num_msix);
 363         if (err)
 364                 goto intx;
 365
 366         for (i = 0; i < num_msix; i++) {
 367                 int id = i / SCI_NUM_MSI_X_INT;
 368                 struct msix_entry *msix = &pci_info->msix_entries[i];
 369                 irq_handler_t isr;
 370
 371                 ihost = pci_info->hosts[id];
 372                 /* odd numbered vectors are error interrupts */
 373                 if (i & 1)
 374                         isr = isci_error_isr;
 375                 else
 376                         isr = isci_msix_isr;
 377
 378                 err = devm_request_irq(&pdev->dev, msix->vector, isr, 0,
 379                                        DRV_NAME"-msix", ihost);
 380                 if (!err)
 381                         continue;
 382
 383                 dev_info(&pdev->dev, "msix setup failed falling back to intx\n");
 384                 while (i--) {
 385                         id = i / SCI_NUM_MSI_X_INT;
 386                         ihost = pci_info->hosts[id];
 387                         msix = &pci_info->msix_entries[i];
 388                         devm_free_irq(&pdev->dev, msix->vector, ihost);
 389                 }
 390                 pci_disable_msix(pdev);
 391                 goto intx;
 392         }
 393         return 0;
 394
 395  intx:
 396         for_each_isci_host(i, ihost, pdev) {
 397                 err = devm_request_irq(&pdev->dev, pdev->irq, isci_intx_isr,
 398                                        IRQF_SHARED, DRV_NAME"-intx", ihost);
 399                 if (err)
 400                         break;
 401         }
 402         return err;
 403 }
 404
 405 static struct isci_host *isci_host_alloc(struct pci_dev *pdev, int id)
 406 {
 407         struct isci_host *isci_host;
 408         struct Scsi_Host *shost;
 409         int err;
 410
 411         isci_host = devm_kzalloc(&pdev->dev, sizeof(*isci_host), GFP_KERNEL);
 412         if (!isci_host)
 413                 return NULL;
 414
 415         isci_host->pdev = pdev;
 416         isci_host->id = id;
 417
 418         shost = scsi_host_alloc(&isci_sht, sizeof(void *));
 419         if (!shost)
 420                 return NULL;
 421         isci_host->shost = shost;
 422
 423         dev_info(&pdev->dev, "%sSCU controller %d: phy 3-0 cables: "
 424                  "{%s, %s, %s, %s}\n",
 425                  (is_cable_select_overridden() ? "* " : ""), isci_host->id,
 426                  lookup_cable_names(decode_cable_selection(isci_host, 3)),
 427                  lookup_cable_names(decode_cable_selection(isci_host, 2)),
 428                  lookup_cable_names(decode_cable_selection(isci_host, 1)),
 429                  lookup_cable_names(decode_cable_selection(isci_host, 0)));
 430
 431         err = isci_host_init(isci_host);
 432         if (err)
 433                 goto err_shost;
 434
 435         SHOST_TO_SAS_HA(shost) = &isci_host->sas_ha;
 436         isci_host->sas_ha.core.shost = shost;
 437         shost->transportt = isci_transport_template;
 438
 439         shost->max_id = ~0;
 440         shost->max_lun = ~0;
 441         shost->max_cmd_len = MAX_COMMAND_SIZE;
 442
 443         err = scsi_add_host(shost, &pdev->dev);
 444         if (err)
 445                 goto err_shost;
 446
 447         err = isci_register_sas_ha(isci_host);
 448         if (err)
 449                 goto err_shost_remove;
 450
 451         return isci_host;
 452
 453  err_shost_remove:
 454         scsi_remove_host(shost);
 455  err_shost:
 456         scsi_host_put(shost);
 457
 458         return NULL;
 459 }
 460
 461 static int __devinit isci_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 462 {
 463         struct isci_pci_info *pci_info;
 464         int err, i;
 465         struct isci_host *isci_host;
 466         const struct firmware *fw = NULL;
 467         struct isci_orom *orom = NULL;
 468         char *source = "(platform)";
 469
 470         dev_info(&pdev->dev, "driver configured for rev: %d silicon\n",
 471                  pdev->revision);
 472
 473         pci_info = devm_kzalloc(&pdev->dev, sizeof(*pci_info), GFP_KERNEL);
 474         if (!pci_info)
 475                 return -ENOMEM;
 476         pci_set_drvdata(pdev, pci_info);
 477
 478         if (efi_enabled)
 479                 orom = isci_get_efi_var(pdev);
 480
 481         if (!orom)
 482                 orom = isci_request_oprom(pdev);
 483
 484         for (i = 0; orom && i < ARRAY_SIZE(orom->ctrl); i++) {
 485                 if (sci_oem_parameters_validate(&orom->ctrl[i],
 486                                                 orom->hdr.version)) {
 487                         dev_warn(&pdev->dev,
 488                                  "[%d]: invalid oem parameters detected, falling back to firmware\n", i);
 489                         devm_kfree(&pdev->dev, orom);
 490                         orom = NULL;
 491                         break;
 492                 }
 493         }
 494
 495         if (!orom) {
 496                 source = "(firmware)";
 497                 orom = isci_request_firmware(pdev, fw);
 498                 if (!orom) {
 499                         /* TODO convert this to WARN_TAINT_ONCE once the
 500                          * orom/efi parameter support is widely available
 501                          */
 502                         dev_warn(&pdev->dev,
 503                                  "Loading user firmware failed, using default "
 504                                  "values\n");
 505                         dev_warn(&pdev->dev,
 506                                  "Default OEM configuration being used: 4 "
 507                                  "narrow ports, and default SAS Addresses\n");
 508                 }
 509         }
 510
 511         if (orom)
 512                 dev_info(&pdev->dev,
 513                          "OEM SAS parameters (version: %u.%u) loaded %s\n",
 514                          (orom->hdr.version & 0xf0) >> 4,
 515                          (orom->hdr.version & 0xf), source);
 516
 517         pci_info->orom = orom;
 518
 519         err = isci_pci_init(pdev);
 520         if (err)
 521                 return err;
 522
 523         for (i = 0; i < num_controllers(pdev); i++) {
 524                 struct isci_host *h = isci_host_alloc(pdev, i);
 525
 526                 if (!h) {
 527                         err = -ENOMEM;
 528                         goto err_host_alloc;
 529                 }
 530                 pci_info->hosts[i] = h;
 531         }
 532
 533         err = isci_setup_interrupts(pdev);
 534         if (err)
 535                 goto err_host_alloc;
 536
 537         for_each_isci_host(i, isci_host, pdev)
 538                 scsi_scan_host(isci_host->shost);
 539
 540         return 0;
 541
 542  err_host_alloc:
 543         for_each_isci_host(i, isci_host, pdev)
 544                 isci_unregister(isci_host);
 545         return err;
 546 }
 547
 548 static void __devexit isci_pci_remove(struct pci_dev *pdev)
 549 {
 550         struct isci_host *ihost;
 551         int i;
 552
 553         for_each_isci_host(i, ihost, pdev) {
 554                 isci_unregister(ihost);
 555                 isci_host_deinit(ihost);
 556                 sci_controller_disable_interrupts(ihost);
 557         }
 558 }
 559
 560 static struct pci_driver isci_pci_driver = {
 561         .name           = DRV_NAME,
 562         .id_table       = isci_id_table,
 563         .probe          = isci_pci_probe,
 564         .remove         = __devexit_p(isci_pci_remove),
 565 };
 566
 567 static __init int isci_init(void)
 568 {
 569         int err;
 570
 571         pr_info("%s: Intel(R) C600 SAS Controller Driver - version %s\n",
 572                 DRV_NAME, DRV_VERSION);
 573
 574         isci_transport_template = sas_domain_attach_transport(&isci_transport_ops);
 575         if (!isci_transport_template)
 576                 return -ENOMEM;
 577
 578         err = pci_register_driver(&isci_pci_driver);
 579         if (err)
 580                 sas_release_transport(isci_transport_template);
 581
 582         return err;
 583 }
 584
 585 static __exit void isci_exit(void)
 586 {
 587         pci_unregister_driver(&isci_pci_driver);
 588         sas_release_transport(isci_transport_template);
 589 }
 590
 591 MODULE_LICENSE("Dual BSD/GPL");
 592 MODULE_FIRMWARE(ISCI_FW_NAME);
 593 module_init(isci_init);
 594 module_exit(isci_exit);