1 /* 2 * Copyright 2014 Cisco Systems, Inc. All rights reserved. 3 * 4 * This program is free software; you may redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; version 2 of the License. 7 * 8 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 9 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 10 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 11 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 12 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 13 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 14 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 15 * SOFTWARE. 16 */ 17 18 #include <linux/module.h> 19 #include <linux/mempool.h> 20 #include <linux/string.h> 21 #include <linux/slab.h> 22 #include <linux/errno.h> 23 #include <linux/init.h> 24 #include <linux/pci.h> 25 #include <linux/skbuff.h> 26 #include <linux/interrupt.h> 27 #include <linux/spinlock.h> 28 #include <linux/workqueue.h> 29 #include <scsi/scsi_host.h> 30 #include <scsi/scsi_tcq.h> 31 32 #include "snic.h" 33 #include "snic_fwint.h" 34 35 #define PCI_DEVICE_ID_CISCO_SNIC 0x0046 36 37 /* Supported devices by snic module */ 38 static struct pci_device_id snic_id_table[] = { 39 {PCI_DEVICE(0x1137, PCI_DEVICE_ID_CISCO_SNIC) }, 40 { 0, } /* end of table */ 41 }; 42 43 unsigned int snic_log_level = 0x0; 44 module_param(snic_log_level, int, S_IRUGO|S_IWUSR); 45 MODULE_PARM_DESC(snic_log_level, "bitmask for snic logging levels"); 46 47 #ifdef CONFIG_SCSI_SNIC_DEBUG_FS 48 unsigned int snic_trace_max_pages = 16; 49 module_param(snic_trace_max_pages, uint, S_IRUGO|S_IWUSR); 50 MODULE_PARM_DESC(snic_trace_max_pages, 51 "Total allocated memory pages for snic trace buffer"); 52 53 #endif 54 unsigned int snic_max_qdepth = SNIC_DFLT_QUEUE_DEPTH; 55 module_param(snic_max_qdepth, uint, S_IRUGO | S_IWUSR); 56 MODULE_PARM_DESC(snic_max_qdepth, "Queue depth to report for each LUN"); 57 58 /* 59 * snic_slave_alloc : callback function to SCSI Mid Layer, called on 60 * scsi device initialization. 61 */ 62 static int 63 snic_slave_alloc(struct scsi_device *sdev) 64 { 65 struct snic_tgt *tgt = starget_to_tgt(scsi_target(sdev)); 66 67 if (!tgt || snic_tgt_chkready(tgt)) 68 return -ENXIO; 69 70 return 0; 71 } 72 73 /* 74 * snic_slave_configure : callback function to SCSI Mid Layer, called on 75 * scsi device initialization. 76 */ 77 static int 78 snic_slave_configure(struct scsi_device *sdev) 79 { 80 struct snic *snic = shost_priv(sdev->host); 81 u32 qdepth = 0, max_ios = 0; 82 int tmo = SNIC_DFLT_CMD_TIMEOUT * HZ; 83 84 /* Set Queue Depth */ 85 max_ios = snic_max_qdepth; 86 qdepth = min_t(u32, max_ios, SNIC_MAX_QUEUE_DEPTH); 87 scsi_change_queue_depth(sdev, qdepth); 88 89 if (snic->fwinfo.io_tmo > 1) 90 tmo = snic->fwinfo.io_tmo * HZ; 91 92 /* FW requires extended timeouts */ 93 blk_queue_rq_timeout(sdev->request_queue, tmo); 94 95 return 0; 96 } 97 98 static int 99 snic_change_queue_depth(struct scsi_device *sdev, int qdepth) 100 { 101 struct snic *snic = shost_priv(sdev->host); 102 int qsz = 0; 103 104 qsz = min_t(u32, qdepth, SNIC_MAX_QUEUE_DEPTH); 105 if (qsz < sdev->queue_depth) 106 atomic64_inc(&snic->s_stats.misc.qsz_rampdown); 107 else if (qsz > sdev->queue_depth) 108 atomic64_inc(&snic->s_stats.misc.qsz_rampup); 109 110 atomic64_set(&snic->s_stats.misc.last_qsz, sdev->queue_depth); 111 112 scsi_change_queue_depth(sdev, qsz); 113 114 return sdev->queue_depth; 115 } 116 117 static struct scsi_host_template snic_host_template = { 118 .module = THIS_MODULE, 119 .name = SNIC_DRV_NAME, 120 .queuecommand = snic_queuecommand, 121 .eh_abort_handler = snic_abort_cmd, 122 .eh_device_reset_handler = snic_device_reset, 123 .eh_host_reset_handler = snic_host_reset, 124 .slave_alloc = snic_slave_alloc, 125 .slave_configure = snic_slave_configure, 126 .change_queue_depth = snic_change_queue_depth, 127 .this_id = -1, 128 .cmd_per_lun = SNIC_DFLT_QUEUE_DEPTH, 129 .can_queue = SNIC_MAX_IO_REQ, 130 .sg_tablesize = SNIC_MAX_SG_DESC_CNT, 131 .max_sectors = 0x800, 132 .shost_attrs = snic_attrs, 133 .track_queue_depth = 1, 134 .cmd_size = sizeof(struct snic_internal_io_state), 135 .proc_name = "snic_scsi", 136 }; 137 138 /* 139 * snic_handle_link_event : Handles link events such as link up/down/error 140 */ 141 void 142 snic_handle_link_event(struct snic *snic) 143 { 144 unsigned long flags; 145 146 spin_lock_irqsave(&snic->snic_lock, flags); 147 if (snic->stop_link_events) { 148 spin_unlock_irqrestore(&snic->snic_lock, flags); 149 150 return; 151 } 152 spin_unlock_irqrestore(&snic->snic_lock, flags); 153 154 queue_work(snic_glob->event_q, &snic->link_work); 155 } /* end of snic_handle_link_event */ 156 157 /* 158 * snic_notify_set : sets notification area 159 * This notification area is to receive events from fw 160 * Note: snic supports only MSIX interrupts, in which we can just call 161 * svnic_dev_notify_set directly 162 */ 163 static int 164 snic_notify_set(struct snic *snic) 165 { 166 int ret = 0; 167 enum vnic_dev_intr_mode intr_mode; 168 169 intr_mode = svnic_dev_get_intr_mode(snic->vdev); 170 171 if (intr_mode == VNIC_DEV_INTR_MODE_MSIX) { 172 ret = svnic_dev_notify_set(snic->vdev, SNIC_MSIX_ERR_NOTIFY); 173 } else { 174 SNIC_HOST_ERR(snic->shost, 175 "Interrupt mode should be setup before devcmd notify set %d\n", 176 intr_mode); 177 ret = -1; 178 } 179 180 return ret; 181 } /* end of snic_notify_set */ 182 183 /* 184 * snic_dev_wait : polls vnic open status. 185 */ 186 static int 187 snic_dev_wait(struct vnic_dev *vdev, 188 int (*start)(struct vnic_dev *, int), 189 int (*finished)(struct vnic_dev *, int *), 190 int arg) 191 { 192 unsigned long time; 193 int ret, done; 194 int retry_cnt = 0; 195 196 ret = start(vdev, arg); 197 if (ret) 198 return ret; 199 200 /* 201 * Wait for func to complete...2 seconds max. 202 * 203 * Sometimes schedule_timeout_uninterruptible take long time 204 * to wakeup, which results skipping retry. The retry counter 205 * ensures to retry at least two times. 206 */ 207 time = jiffies + (HZ * 2); 208 do { 209 ret = finished(vdev, &done); 210 if (ret) 211 return ret; 212 213 if (done) 214 return 0; 215 schedule_timeout_uninterruptible(HZ/10); 216 ++retry_cnt; 217 } while (time_after(time, jiffies) || (retry_cnt < 3)); 218 219 return -ETIMEDOUT; 220 } /* end of snic_dev_wait */ 221 222 /* 223 * snic_cleanup: called by snic_remove 224 * Stops the snic device, masks all interrupts, Completed CQ entries are 225 * drained. Posted WQ/RQ/Copy-WQ entries are cleanup 226 */ 227 static int 228 snic_cleanup(struct snic *snic) 229 { 230 unsigned int i; 231 int ret; 232 233 svnic_dev_disable(snic->vdev); 234 for (i = 0; i < snic->intr_count; i++) 235 svnic_intr_mask(&snic->intr[i]); 236 237 for (i = 0; i < snic->wq_count; i++) { 238 ret = svnic_wq_disable(&snic->wq[i]); 239 if (ret) 240 return ret; 241 } 242 243 /* Clean up completed IOs */ 244 snic_fwcq_cmpl_handler(snic, -1); 245 246 snic_wq_cmpl_handler(snic, -1); 247 248 /* Clean up the IOs that have not completed */ 249 for (i = 0; i < snic->wq_count; i++) 250 svnic_wq_clean(&snic->wq[i], snic_free_wq_buf); 251 252 for (i = 0; i < snic->cq_count; i++) 253 svnic_cq_clean(&snic->cq[i]); 254 255 for (i = 0; i < snic->intr_count; i++) 256 svnic_intr_clean(&snic->intr[i]); 257 258 /* Cleanup snic specific requests */ 259 snic_free_all_untagged_reqs(snic); 260 261 /* Cleanup Pending SCSI commands */ 262 snic_shutdown_scsi_cleanup(snic); 263 264 for (i = 0; i < SNIC_REQ_MAX_CACHES; i++) 265 mempool_destroy(snic->req_pool[i]); 266 267 return 0; 268 } /* end of snic_cleanup */ 269 270 271 static void 272 snic_iounmap(struct snic *snic) 273 { 274 if (snic->bar0.vaddr) 275 iounmap(snic->bar0.vaddr); 276 } 277 278 /* 279 * snic_vdev_open_done : polls for svnic_dev_open cmd completion. 280 */ 281 static int 282 snic_vdev_open_done(struct vnic_dev *vdev, int *done) 283 { 284 struct snic *snic = svnic_dev_priv(vdev); 285 int ret; 286 int nretries = 5; 287 288 do { 289 ret = svnic_dev_open_done(vdev, done); 290 if (ret == 0) 291 break; 292 293 SNIC_HOST_INFO(snic->shost, "VNIC_DEV_OPEN Timedout.\n"); 294 } while (nretries--); 295 296 return ret; 297 } /* end of snic_vdev_open_done */ 298 299 /* 300 * snic_add_host : registers scsi host with ML 301 */ 302 static int 303 snic_add_host(struct Scsi_Host *shost, struct pci_dev *pdev) 304 { 305 int ret = 0; 306 307 ret = scsi_add_host(shost, &pdev->dev); 308 if (ret) { 309 SNIC_HOST_ERR(shost, 310 "snic: scsi_add_host failed. %d\n", 311 ret); 312 313 return ret; 314 } 315 316 SNIC_BUG_ON(shost->work_q != NULL); 317 snprintf(shost->work_q_name, sizeof(shost->work_q_name), "scsi_wq_%d", 318 shost->host_no); 319 shost->work_q = create_singlethread_workqueue(shost->work_q_name); 320 if (!shost->work_q) { 321 SNIC_HOST_ERR(shost, "Failed to Create ScsiHost wq.\n"); 322 323 ret = -ENOMEM; 324 } 325 326 return ret; 327 } /* end of snic_add_host */ 328 329 static void 330 snic_del_host(struct Scsi_Host *shost) 331 { 332 if (!shost->work_q) 333 return; 334 335 destroy_workqueue(shost->work_q); 336 shost->work_q = NULL; 337 scsi_remove_host(shost); 338 } 339 340 int 341 snic_get_state(struct snic *snic) 342 { 343 return atomic_read(&snic->state); 344 } 345 346 void 347 snic_set_state(struct snic *snic, enum snic_state state) 348 { 349 SNIC_HOST_INFO(snic->shost, "snic state change from %s to %s\n", 350 snic_state_to_str(snic_get_state(snic)), 351 snic_state_to_str(state)); 352 353 atomic_set(&snic->state, state); 354 } 355 356 /* 357 * snic_probe : Initialize the snic interface. 358 */ 359 static int 360 snic_probe(struct pci_dev *pdev, const struct pci_device_id *ent) 361 { 362 struct Scsi_Host *shost; 363 struct snic *snic; 364 mempool_t *pool; 365 unsigned long flags; 366 u32 max_ios = 0; 367 int ret, i; 368 369 /* Device Information */ 370 SNIC_INFO("snic device %4x:%4x:%4x:%4x: ", 371 pdev->vendor, pdev->device, pdev->subsystem_vendor, 372 pdev->subsystem_device); 373 374 SNIC_INFO("snic device bus %x: slot %x: fn %x\n", 375 pdev->bus->number, PCI_SLOT(pdev->devfn), 376 PCI_FUNC(pdev->devfn)); 377 378 /* 379 * Allocate SCSI Host and setup association between host, and snic 380 */ 381 shost = scsi_host_alloc(&snic_host_template, sizeof(struct snic)); 382 if (!shost) { 383 SNIC_ERR("Unable to alloc scsi_host\n"); 384 ret = -ENOMEM; 385 386 goto prob_end; 387 } 388 snic = shost_priv(shost); 389 snic->shost = shost; 390 391 snprintf(snic->name, sizeof(snic->name) - 1, "%s%d", SNIC_DRV_NAME, 392 shost->host_no); 393 394 SNIC_HOST_INFO(shost, 395 "snic%d = %p shost = %p device bus %x: slot %x: fn %x\n", 396 shost->host_no, snic, shost, pdev->bus->number, 397 PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn)); 398 #ifdef CONFIG_SCSI_SNIC_DEBUG_FS 399 /* Per snic debugfs init */ 400 snic_stats_debugfs_init(snic); 401 #endif 402 403 /* Setup PCI Resources */ 404 pci_set_drvdata(pdev, snic); 405 snic->pdev = pdev; 406 407 ret = pci_enable_device(pdev); 408 if (ret) { 409 SNIC_HOST_ERR(shost, 410 "Cannot enable PCI Resources, aborting : %d\n", 411 ret); 412 413 goto err_free_snic; 414 } 415 416 ret = pci_request_regions(pdev, SNIC_DRV_NAME); 417 if (ret) { 418 SNIC_HOST_ERR(shost, 419 "Cannot obtain PCI Resources, aborting : %d\n", 420 ret); 421 422 goto err_pci_disable; 423 } 424 425 pci_set_master(pdev); 426 427 /* 428 * Query PCI Controller on system for DMA addressing 429 * limitation for the device. Try 43-bit first, and 430 * fail to 32-bit. 431 */ 432 ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(43)); 433 if (ret) { 434 ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); 435 if (ret) { 436 SNIC_HOST_ERR(shost, 437 "No Usable DMA Configuration, aborting %d\n", 438 ret); 439 goto err_rel_regions; 440 } 441 } 442 443 /* Map vNIC resources from BAR0 */ 444 if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM)) { 445 SNIC_HOST_ERR(shost, "BAR0 not memory mappable aborting.\n"); 446 447 ret = -ENODEV; 448 goto err_rel_regions; 449 } 450 451 snic->bar0.vaddr = pci_iomap(pdev, 0, 0); 452 if (!snic->bar0.vaddr) { 453 SNIC_HOST_ERR(shost, 454 "Cannot memory map BAR0 res hdr aborting.\n"); 455 456 ret = -ENODEV; 457 goto err_rel_regions; 458 } 459 460 snic->bar0.bus_addr = pci_resource_start(pdev, 0); 461 snic->bar0.len = pci_resource_len(pdev, 0); 462 SNIC_BUG_ON(snic->bar0.bus_addr == 0); 463 464 /* Devcmd2 Resource Allocation and Initialization */ 465 snic->vdev = svnic_dev_alloc_discover(NULL, snic, pdev, &snic->bar0, 1); 466 if (!snic->vdev) { 467 SNIC_HOST_ERR(shost, "vNIC Resource Discovery Failed.\n"); 468 469 ret = -ENODEV; 470 goto err_iounmap; 471 } 472 473 ret = svnic_dev_cmd_init(snic->vdev, 0); 474 if (ret) { 475 SNIC_HOST_INFO(shost, "Devcmd2 Init Failed. err = %d\n", ret); 476 477 goto err_vnic_unreg; 478 } 479 480 ret = snic_dev_wait(snic->vdev, svnic_dev_open, snic_vdev_open_done, 0); 481 if (ret) { 482 SNIC_HOST_ERR(shost, 483 "vNIC dev open failed, aborting. %d\n", 484 ret); 485 486 goto err_vnic_unreg; 487 } 488 489 ret = svnic_dev_init(snic->vdev, 0); 490 if (ret) { 491 SNIC_HOST_ERR(shost, 492 "vNIC dev init failed. aborting. %d\n", 493 ret); 494 495 goto err_dev_close; 496 } 497 498 /* Get vNIC information */ 499 ret = snic_get_vnic_config(snic); 500 if (ret) { 501 SNIC_HOST_ERR(shost, 502 "Get vNIC configuration failed, aborting. %d\n", 503 ret); 504 505 goto err_dev_close; 506 } 507 508 /* Configure Maximum Outstanding IO reqs */ 509 max_ios = snic->config.io_throttle_count; 510 if (max_ios != SNIC_UCSM_DFLT_THROTTLE_CNT_BLD) 511 shost->can_queue = min_t(u32, SNIC_MAX_IO_REQ, 512 max_t(u32, SNIC_MIN_IO_REQ, max_ios)); 513 514 snic->max_tag_id = shost->can_queue; 515 516 shost->max_lun = snic->config.luns_per_tgt; 517 shost->max_id = SNIC_MAX_TARGET; 518 519 shost->max_cmd_len = MAX_COMMAND_SIZE; /*defined in scsi_cmnd.h*/ 520 521 snic_get_res_counts(snic); 522 523 /* 524 * Assumption: Only MSIx is supported 525 */ 526 ret = snic_set_intr_mode(snic); 527 if (ret) { 528 SNIC_HOST_ERR(shost, 529 "Failed to set intr mode aborting. %d\n", 530 ret); 531 532 goto err_dev_close; 533 } 534 535 ret = snic_alloc_vnic_res(snic); 536 if (ret) { 537 SNIC_HOST_ERR(shost, 538 "Failed to alloc vNIC resources aborting. %d\n", 539 ret); 540 541 goto err_clear_intr; 542 } 543 544 /* Initialize specific lists */ 545 INIT_LIST_HEAD(&snic->list); 546 547 /* 548 * spl_cmd_list for maintaining snic specific cmds 549 * such as EXCH_VER_REQ, REPORT_TARGETS etc 550 */ 551 INIT_LIST_HEAD(&snic->spl_cmd_list); 552 spin_lock_init(&snic->spl_cmd_lock); 553 554 /* initialize all snic locks */ 555 spin_lock_init(&snic->snic_lock); 556 557 for (i = 0; i < SNIC_WQ_MAX; i++) 558 spin_lock_init(&snic->wq_lock[i]); 559 560 for (i = 0; i < SNIC_IO_LOCKS; i++) 561 spin_lock_init(&snic->io_req_lock[i]); 562 563 pool = mempool_create_slab_pool(2, 564 snic_glob->req_cache[SNIC_REQ_CACHE_DFLT_SGL]); 565 if (!pool) { 566 SNIC_HOST_ERR(shost, "dflt sgl pool creation failed\n"); 567 568 ret = -ENOMEM; 569 goto err_free_res; 570 } 571 572 snic->req_pool[SNIC_REQ_CACHE_DFLT_SGL] = pool; 573 574 pool = mempool_create_slab_pool(2, 575 snic_glob->req_cache[SNIC_REQ_CACHE_MAX_SGL]); 576 if (!pool) { 577 SNIC_HOST_ERR(shost, "max sgl pool creation failed\n"); 578 579 ret = -ENOMEM; 580 goto err_free_dflt_sgl_pool; 581 } 582 583 snic->req_pool[SNIC_REQ_CACHE_MAX_SGL] = pool; 584 585 pool = mempool_create_slab_pool(2, 586 snic_glob->req_cache[SNIC_REQ_TM_CACHE]); 587 if (!pool) { 588 SNIC_HOST_ERR(shost, "snic tmreq info pool creation failed.\n"); 589 590 ret = -ENOMEM; 591 goto err_free_max_sgl_pool; 592 } 593 594 snic->req_pool[SNIC_REQ_TM_CACHE] = pool; 595 596 /* Initialize snic state */ 597 atomic_set(&snic->state, SNIC_INIT); 598 599 atomic_set(&snic->ios_inflight, 0); 600 601 /* Setup notification buffer area */ 602 ret = snic_notify_set(snic); 603 if (ret) { 604 SNIC_HOST_ERR(shost, 605 "Failed to alloc notify buffer aborting. %d\n", 606 ret); 607 608 goto err_free_tmreq_pool; 609 } 610 611 spin_lock_irqsave(&snic_glob->snic_list_lock, flags); 612 list_add_tail(&snic->list, &snic_glob->snic_list); 613 spin_unlock_irqrestore(&snic_glob->snic_list_lock, flags); 614 615 snic_disc_init(&snic->disc); 616 INIT_WORK(&snic->tgt_work, snic_handle_tgt_disc); 617 INIT_WORK(&snic->disc_work, snic_handle_disc); 618 INIT_WORK(&snic->link_work, snic_handle_link); 619 620 /* Enable all queues */ 621 for (i = 0; i < snic->wq_count; i++) 622 svnic_wq_enable(&snic->wq[i]); 623 624 ret = svnic_dev_enable_wait(snic->vdev); 625 if (ret) { 626 SNIC_HOST_ERR(shost, 627 "vNIC dev enable failed w/ error %d\n", 628 ret); 629 630 goto err_vdev_enable; 631 } 632 633 ret = snic_request_intr(snic); 634 if (ret) { 635 SNIC_HOST_ERR(shost, "Unable to request irq. %d\n", ret); 636 637 goto err_req_intr; 638 } 639 640 for (i = 0; i < snic->intr_count; i++) 641 svnic_intr_unmask(&snic->intr[i]); 642 643 /* Get snic params */ 644 ret = snic_get_conf(snic); 645 if (ret) { 646 SNIC_HOST_ERR(shost, 647 "Failed to get snic io config from FW w err %d\n", 648 ret); 649 650 goto err_get_conf; 651 } 652 653 /* 654 * Initialization done with PCI system, hardware, firmware. 655 * Add shost to SCSI 656 */ 657 ret = snic_add_host(shost, pdev); 658 if (ret) { 659 SNIC_HOST_ERR(shost, 660 "Adding scsi host Failed ... exiting. %d\n", 661 ret); 662 663 goto err_get_conf; 664 } 665 666 snic_set_state(snic, SNIC_ONLINE); 667 668 ret = snic_disc_start(snic); 669 if (ret) { 670 SNIC_HOST_ERR(shost, "snic_probe:Discovery Failed w err = %d\n", 671 ret); 672 673 goto err_get_conf; 674 } 675 676 SNIC_HOST_INFO(shost, "SNIC Device Probe Successful.\n"); 677 678 return 0; 679 680 err_get_conf: 681 snic_free_all_untagged_reqs(snic); 682 683 for (i = 0; i < snic->intr_count; i++) 684 svnic_intr_mask(&snic->intr[i]); 685 686 snic_free_intr(snic); 687 688 err_req_intr: 689 svnic_dev_disable(snic->vdev); 690 691 err_vdev_enable: 692 svnic_dev_notify_unset(snic->vdev); 693 694 for (i = 0; i < snic->wq_count; i++) { 695 int rc = 0; 696 697 rc = svnic_wq_disable(&snic->wq[i]); 698 if (rc) { 699 SNIC_HOST_ERR(shost, 700 "WQ Disable Failed w/ err = %d\n", rc); 701 702 break; 703 } 704 } 705 snic_del_host(snic->shost); 706 707 err_free_tmreq_pool: 708 mempool_destroy(snic->req_pool[SNIC_REQ_TM_CACHE]); 709 710 err_free_max_sgl_pool: 711 mempool_destroy(snic->req_pool[SNIC_REQ_CACHE_MAX_SGL]); 712 713 err_free_dflt_sgl_pool: 714 mempool_destroy(snic->req_pool[SNIC_REQ_CACHE_DFLT_SGL]); 715 716 err_free_res: 717 snic_free_vnic_res(snic); 718 719 err_clear_intr: 720 snic_clear_intr_mode(snic); 721 722 err_dev_close: 723 svnic_dev_close(snic->vdev); 724 725 err_vnic_unreg: 726 svnic_dev_unregister(snic->vdev); 727 728 err_iounmap: 729 snic_iounmap(snic); 730 731 err_rel_regions: 732 pci_release_regions(pdev); 733 734 err_pci_disable: 735 pci_disable_device(pdev); 736 737 err_free_snic: 738 #ifdef CONFIG_SCSI_SNIC_DEBUG_FS 739 snic_stats_debugfs_remove(snic); 740 #endif 741 scsi_host_put(shost); 742 pci_set_drvdata(pdev, NULL); 743 744 prob_end: 745 SNIC_INFO("sNIC device : bus %d: slot %d: fn %d Registration Failed.\n", 746 pdev->bus->number, PCI_SLOT(pdev->devfn), 747 PCI_FUNC(pdev->devfn)); 748 749 return ret; 750 } /* end of snic_probe */ 751 752 753 /* 754 * snic_remove : invoked on unbinding the interface to cleanup the 755 * resources allocated in snic_probe on initialization. 756 */ 757 static void 758 snic_remove(struct pci_dev *pdev) 759 { 760 struct snic *snic = pci_get_drvdata(pdev); 761 unsigned long flags; 762 763 if (!snic) { 764 SNIC_INFO("sNIC dev: bus %d slot %d fn %d snic inst is null.\n", 765 pdev->bus->number, PCI_SLOT(pdev->devfn), 766 PCI_FUNC(pdev->devfn)); 767 768 return; 769 } 770 771 /* 772 * Mark state so that the workqueue thread stops forwarding 773 * received frames and link events. ISR and other threads 774 * that can queue work items will also stop creating work 775 * items on the snic workqueue 776 */ 777 snic_set_state(snic, SNIC_OFFLINE); 778 spin_lock_irqsave(&snic->snic_lock, flags); 779 snic->stop_link_events = 1; 780 spin_unlock_irqrestore(&snic->snic_lock, flags); 781 782 flush_workqueue(snic_glob->event_q); 783 snic_disc_term(snic); 784 785 spin_lock_irqsave(&snic->snic_lock, flags); 786 snic->in_remove = 1; 787 spin_unlock_irqrestore(&snic->snic_lock, flags); 788 789 /* 790 * This stops the snic device, masks all interrupts, Completed 791 * CQ entries are drained. Posted WQ/RQ/Copy-WQ entries are 792 * cleanup 793 */ 794 snic_cleanup(snic); 795 796 spin_lock_irqsave(&snic_glob->snic_list_lock, flags); 797 list_del(&snic->list); 798 spin_unlock_irqrestore(&snic_glob->snic_list_lock, flags); 799 800 snic_tgt_del_all(snic); 801 #ifdef CONFIG_SCSI_SNIC_DEBUG_FS 802 snic_stats_debugfs_remove(snic); 803 #endif 804 snic_del_host(snic->shost); 805 806 svnic_dev_notify_unset(snic->vdev); 807 snic_free_intr(snic); 808 snic_free_vnic_res(snic); 809 snic_clear_intr_mode(snic); 810 svnic_dev_close(snic->vdev); 811 svnic_dev_unregister(snic->vdev); 812 snic_iounmap(snic); 813 pci_release_regions(pdev); 814 pci_disable_device(pdev); 815 pci_set_drvdata(pdev, NULL); 816 817 /* this frees Scsi_Host and snic memory (continuous chunk) */ 818 scsi_host_put(snic->shost); 819 } /* end of snic_remove */ 820 821 822 struct snic_global *snic_glob; 823 824 /* 825 * snic_global_data_init: Initialize SNIC Global Data 826 * Notes: All the global lists, variables should be part of global data 827 * this helps in debugging. 828 */ 829 static int 830 snic_global_data_init(void) 831 { 832 int ret = 0; 833 struct kmem_cache *cachep; 834 ssize_t len = 0; 835 836 snic_glob = kzalloc(sizeof(*snic_glob), GFP_KERNEL); 837 838 if (!snic_glob) { 839 SNIC_ERR("Failed to allocate Global Context.\n"); 840 841 ret = -ENOMEM; 842 goto gdi_end; 843 } 844 845 #ifdef CONFIG_SCSI_SNIC_DEBUG_FS 846 /* Debugfs related Initialization */ 847 /* Create debugfs entries for snic */ 848 snic_debugfs_init(); 849 850 /* Trace related Initialization */ 851 /* Allocate memory for trace buffer */ 852 ret = snic_trc_init(); 853 if (ret < 0) { 854 SNIC_ERR("Trace buffer init failed, SNIC tracing disabled\n"); 855 snic_trc_free(); 856 /* continue even if it fails */ 857 } 858 859 #endif 860 INIT_LIST_HEAD(&snic_glob->snic_list); 861 spin_lock_init(&snic_glob->snic_list_lock); 862 863 /* Create a cache for allocation of snic_host_req+default size ESGLs */ 864 len = sizeof(struct snic_req_info); 865 len += sizeof(struct snic_host_req) + sizeof(struct snic_dflt_sgl); 866 cachep = kmem_cache_create("snic_req_dfltsgl", len, SNIC_SG_DESC_ALIGN, 867 SLAB_HWCACHE_ALIGN, NULL); 868 if (!cachep) { 869 SNIC_ERR("Failed to create snic default sgl slab\n"); 870 ret = -ENOMEM; 871 872 goto err_dflt_req_slab; 873 } 874 snic_glob->req_cache[SNIC_REQ_CACHE_DFLT_SGL] = cachep; 875 876 /* Create a cache for allocation of max size Extended SGLs */ 877 len = sizeof(struct snic_req_info); 878 len += sizeof(struct snic_host_req) + sizeof(struct snic_max_sgl); 879 cachep = kmem_cache_create("snic_req_maxsgl", len, SNIC_SG_DESC_ALIGN, 880 SLAB_HWCACHE_ALIGN, NULL); 881 if (!cachep) { 882 SNIC_ERR("Failed to create snic max sgl slab\n"); 883 ret = -ENOMEM; 884 885 goto err_max_req_slab; 886 } 887 snic_glob->req_cache[SNIC_REQ_CACHE_MAX_SGL] = cachep; 888 889 len = sizeof(struct snic_host_req); 890 cachep = kmem_cache_create("snic_req_maxsgl", len, SNIC_SG_DESC_ALIGN, 891 SLAB_HWCACHE_ALIGN, NULL); 892 if (!cachep) { 893 SNIC_ERR("Failed to create snic tm req slab\n"); 894 ret = -ENOMEM; 895 896 goto err_tmreq_slab; 897 } 898 snic_glob->req_cache[SNIC_REQ_TM_CACHE] = cachep; 899 900 /* snic_event queue */ 901 snic_glob->event_q = create_singlethread_workqueue("snic_event_wq"); 902 if (!snic_glob->event_q) { 903 SNIC_ERR("snic event queue create failed\n"); 904 ret = -ENOMEM; 905 906 goto err_eventq; 907 } 908 909 return ret; 910 911 err_eventq: 912 kmem_cache_destroy(snic_glob->req_cache[SNIC_REQ_TM_CACHE]); 913 914 err_tmreq_slab: 915 kmem_cache_destroy(snic_glob->req_cache[SNIC_REQ_CACHE_MAX_SGL]); 916 917 err_max_req_slab: 918 kmem_cache_destroy(snic_glob->req_cache[SNIC_REQ_CACHE_DFLT_SGL]); 919 920 err_dflt_req_slab: 921 #ifdef CONFIG_SCSI_SNIC_DEBUG_FS 922 snic_trc_free(); 923 snic_debugfs_term(); 924 #endif 925 kfree(snic_glob); 926 snic_glob = NULL; 927 928 gdi_end: 929 return ret; 930 } /* end of snic_glob_init */ 931 932 /* 933 * snic_global_data_cleanup : Frees SNIC Global Data 934 */ 935 static void 936 snic_global_data_cleanup(void) 937 { 938 SNIC_BUG_ON(snic_glob == NULL); 939 940 destroy_workqueue(snic_glob->event_q); 941 kmem_cache_destroy(snic_glob->req_cache[SNIC_REQ_TM_CACHE]); 942 kmem_cache_destroy(snic_glob->req_cache[SNIC_REQ_CACHE_MAX_SGL]); 943 kmem_cache_destroy(snic_glob->req_cache[SNIC_REQ_CACHE_DFLT_SGL]); 944 945 #ifdef CONFIG_SCSI_SNIC_DEBUG_FS 946 /* Freeing Trace Resources */ 947 snic_trc_free(); 948 949 /* Freeing Debugfs Resources */ 950 snic_debugfs_term(); 951 #endif 952 kfree(snic_glob); 953 snic_glob = NULL; 954 } /* end of snic_glob_cleanup */ 955 956 static struct pci_driver snic_driver = { 957 .name = SNIC_DRV_NAME, 958 .id_table = snic_id_table, 959 .probe = snic_probe, 960 .remove = snic_remove, 961 }; 962 963 static int __init 964 snic_init_module(void) 965 { 966 int ret = 0; 967 968 #ifndef __x86_64__ 969 SNIC_INFO("SNIC Driver is supported only for x86_64 platforms!\n"); 970 add_taint(TAINT_CPU_OUT_OF_SPEC, LOCKDEP_STILL_OK); 971 #endif 972 973 SNIC_INFO("%s, ver %s\n", SNIC_DRV_DESCRIPTION, SNIC_DRV_VERSION); 974 975 ret = snic_global_data_init(); 976 if (ret) { 977 SNIC_ERR("Failed to Initialize Global Data.\n"); 978 979 return ret; 980 } 981 982 ret = pci_register_driver(&snic_driver); 983 if (ret < 0) { 984 SNIC_ERR("PCI driver register error\n"); 985 986 goto err_pci_reg; 987 } 988 989 return ret; 990 991 err_pci_reg: 992 snic_global_data_cleanup(); 993 994 return ret; 995 } 996 997 static void __exit 998 snic_cleanup_module(void) 999 { 1000 pci_unregister_driver(&snic_driver); 1001 snic_global_data_cleanup(); 1002 } 1003 1004 module_init(snic_init_module); 1005 module_exit(snic_cleanup_module); 1006 1007 MODULE_LICENSE("GPL v2"); 1008 MODULE_DESCRIPTION(SNIC_DRV_DESCRIPTION); 1009 MODULE_VERSION(SNIC_DRV_VERSION); 1010 MODULE_DEVICE_TABLE(pci, snic_id_table); 1011 MODULE_AUTHOR("Narsimhulu Musini <nmusini@cisco.com>, " 1012 "Sesidhar Baddela <sebaddel@cisco.com>"); 1013