Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 | /* * Linux driver for VMware's para-virtualized SCSI HBA. * * Copyright (C) 2008-2009, VMware, Inc. All Rights Reserved. * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; version 2 of the License and no later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or * NON INFRINGEMENT. See the GNU General Public License for more * details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Maintained by: Alok N Kataria <akataria@vmware.com> * */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/interrupt.h> #include <linux/workqueue.h> #include <linux/pci.h> #include <scsi/scsi.h> #include <scsi/scsi_host.h> #include <scsi/scsi_cmnd.h> #include <scsi/scsi_device.h> #include "vmw_pvscsi.h" #define PVSCSI_LINUX_DRIVER_DESC "VMware PVSCSI driver" MODULE_DESCRIPTION(PVSCSI_LINUX_DRIVER_DESC); MODULE_AUTHOR("VMware, Inc."); MODULE_LICENSE("GPL"); MODULE_VERSION(PVSCSI_DRIVER_VERSION_STRING); #define PVSCSI_DEFAULT_NUM_PAGES_PER_RING 8 #define PVSCSI_DEFAULT_NUM_PAGES_MSG_RING 1 #define PVSCSI_DEFAULT_QUEUE_DEPTH 64 #define SGL_SIZE PAGE_SIZE struct pvscsi_sg_list { struct PVSCSISGElement sge[PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT]; }; struct pvscsi_ctx { /* * The index of the context in cmd_map serves as the context ID for a * 1-to-1 mapping completions back to requests. */ struct scsi_cmnd *cmd; struct pvscsi_sg_list *sgl; struct list_head list; dma_addr_t dataPA; dma_addr_t sensePA; dma_addr_t sglPA; }; struct pvscsi_adapter { char *mmioBase; unsigned int irq; u8 rev; bool use_msi; bool use_msix; bool use_msg; spinlock_t hw_lock; struct workqueue_struct *workqueue; struct work_struct work; struct PVSCSIRingReqDesc *req_ring; unsigned req_pages; unsigned req_depth; dma_addr_t reqRingPA; struct PVSCSIRingCmpDesc *cmp_ring; unsigned cmp_pages; dma_addr_t cmpRingPA; struct PVSCSIRingMsgDesc *msg_ring; unsigned msg_pages; dma_addr_t msgRingPA; struct PVSCSIRingsState *rings_state; dma_addr_t ringStatePA; struct pci_dev *dev; struct Scsi_Host *host; struct list_head cmd_pool; struct pvscsi_ctx *cmd_map; }; /* Command line parameters */ static int pvscsi_ring_pages = PVSCSI_DEFAULT_NUM_PAGES_PER_RING; static int pvscsi_msg_ring_pages = PVSCSI_DEFAULT_NUM_PAGES_MSG_RING; static int pvscsi_cmd_per_lun = PVSCSI_DEFAULT_QUEUE_DEPTH; static bool pvscsi_disable_msi; static bool pvscsi_disable_msix; static bool pvscsi_use_msg = true; #define PVSCSI_RW (S_IRUSR | S_IWUSR) module_param_named(ring_pages, pvscsi_ring_pages, int, PVSCSI_RW); MODULE_PARM_DESC(ring_pages, "Number of pages per req/cmp ring - (default=" __stringify(PVSCSI_DEFAULT_NUM_PAGES_PER_RING) ")"); module_param_named(msg_ring_pages, pvscsi_msg_ring_pages, int, PVSCSI_RW); MODULE_PARM_DESC(msg_ring_pages, "Number of pages for the msg ring - (default=" __stringify(PVSCSI_DEFAULT_NUM_PAGES_MSG_RING) ")"); module_param_named(cmd_per_lun, pvscsi_cmd_per_lun, int, PVSCSI_RW); MODULE_PARM_DESC(cmd_per_lun, "Maximum commands per lun - (default=" __stringify(PVSCSI_MAX_REQ_QUEUE_DEPTH) ")"); module_param_named(disable_msi, pvscsi_disable_msi, bool, PVSCSI_RW); MODULE_PARM_DESC(disable_msi, "Disable MSI use in driver - (default=0)"); module_param_named(disable_msix, pvscsi_disable_msix, bool, PVSCSI_RW); MODULE_PARM_DESC(disable_msix, "Disable MSI-X use in driver - (default=0)"); module_param_named(use_msg, pvscsi_use_msg, bool, PVSCSI_RW); MODULE_PARM_DESC(use_msg, "Use msg ring when available - (default=1)"); static const struct pci_device_id pvscsi_pci_tbl[] = { { PCI_VDEVICE(VMWARE, PCI_DEVICE_ID_VMWARE_PVSCSI) }, { 0 } }; MODULE_DEVICE_TABLE(pci, pvscsi_pci_tbl); static struct device * pvscsi_dev(const struct pvscsi_adapter *adapter) { return &(adapter->dev->dev); } static struct pvscsi_ctx * pvscsi_find_context(const struct pvscsi_adapter *adapter, struct scsi_cmnd *cmd) { struct pvscsi_ctx *ctx, *end; end = &adapter->cmd_map[adapter->req_depth]; for (ctx = adapter->cmd_map; ctx < end; ctx++) if (ctx->cmd == cmd) return ctx; return NULL; } static struct pvscsi_ctx * pvscsi_acquire_context(struct pvscsi_adapter *adapter, struct scsi_cmnd *cmd) { struct pvscsi_ctx *ctx; if (list_empty(&adapter->cmd_pool)) return NULL; ctx = list_first_entry(&adapter->cmd_pool, struct pvscsi_ctx, list); ctx->cmd = cmd; list_del(&ctx->list); return ctx; } static void pvscsi_release_context(struct pvscsi_adapter *adapter, struct pvscsi_ctx *ctx) { ctx->cmd = NULL; list_add(&ctx->list, &adapter->cmd_pool); } /* * Map a pvscsi_ctx struct to a context ID field value; we map to a simple * non-zero integer. ctx always points to an entry in cmd_map array, hence * the return value is always >=1. */ static u64 pvscsi_map_context(const struct pvscsi_adapter *adapter, const struct pvscsi_ctx *ctx) { return ctx - adapter->cmd_map + 1; } static struct pvscsi_ctx * pvscsi_get_context(const struct pvscsi_adapter *adapter, u64 context) { return &adapter->cmd_map[context - 1]; } static void pvscsi_reg_write(const struct pvscsi_adapter *adapter, u32 offset, u32 val) { writel(val, adapter->mmioBase + offset); } static u32 pvscsi_reg_read(const struct pvscsi_adapter *adapter, u32 offset) { return readl(adapter->mmioBase + offset); } static u32 pvscsi_read_intr_status(const struct pvscsi_adapter *adapter) { return pvscsi_reg_read(adapter, PVSCSI_REG_OFFSET_INTR_STATUS); } static void pvscsi_write_intr_status(const struct pvscsi_adapter *adapter, u32 val) { pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_STATUS, val); } static void pvscsi_unmask_intr(const struct pvscsi_adapter *adapter) { u32 intr_bits; intr_bits = PVSCSI_INTR_CMPL_MASK; if (adapter->use_msg) intr_bits |= PVSCSI_INTR_MSG_MASK; pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_MASK, intr_bits); } static void pvscsi_mask_intr(const struct pvscsi_adapter *adapter) { pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_INTR_MASK, 0); } static void pvscsi_write_cmd_desc(const struct pvscsi_adapter *adapter, u32 cmd, const void *desc, size_t len) { const u32 *ptr = desc; size_t i; len /= sizeof(*ptr); pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_COMMAND, cmd); for (i = 0; i < len; i++) pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_COMMAND_DATA, ptr[i]); } static void pvscsi_abort_cmd(const struct pvscsi_adapter *adapter, const struct pvscsi_ctx *ctx) { struct PVSCSICmdDescAbortCmd cmd = { 0 }; cmd.target = ctx->cmd->device->id; cmd.context = pvscsi_map_context(adapter, ctx); pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_ABORT_CMD, &cmd, sizeof(cmd)); } static void pvscsi_kick_rw_io(const struct pvscsi_adapter *adapter) { pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_KICK_RW_IO, 0); } static void pvscsi_process_request_ring(const struct pvscsi_adapter *adapter) { pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_KICK_NON_RW_IO, 0); } static int scsi_is_rw(unsigned char op) { return op == READ_6 || op == WRITE_6 || op == READ_10 || op == WRITE_10 || op == READ_12 || op == WRITE_12 || op == READ_16 || op == WRITE_16; } static void pvscsi_kick_io(const struct pvscsi_adapter *adapter, unsigned char op) { if (scsi_is_rw(op)) pvscsi_kick_rw_io(adapter); else pvscsi_process_request_ring(adapter); } static void ll_adapter_reset(const struct pvscsi_adapter *adapter) { dev_dbg(pvscsi_dev(adapter), "Adapter Reset on %p\n", adapter); pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_ADAPTER_RESET, NULL, 0); } static void ll_bus_reset(const struct pvscsi_adapter *adapter) { dev_dbg(pvscsi_dev(adapter), "Reseting bus on %p\n", adapter); pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_RESET_BUS, NULL, 0); } static void ll_device_reset(const struct pvscsi_adapter *adapter, u32 target) { struct PVSCSICmdDescResetDevice cmd = { 0 }; dev_dbg(pvscsi_dev(adapter), "Reseting device: target=%u\n", target); cmd.target = target; pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_RESET_DEVICE, &cmd, sizeof(cmd)); } static void pvscsi_create_sg(struct pvscsi_ctx *ctx, struct scatterlist *sg, unsigned count) { unsigned i; struct PVSCSISGElement *sge; BUG_ON(count > PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT); sge = &ctx->sgl->sge[0]; for (i = 0; i < count; i++, sg++) { sge[i].addr = sg_dma_address(sg); sge[i].length = sg_dma_len(sg); sge[i].flags = 0; } } /* * Map all data buffers for a command into PCI space and * setup the scatter/gather list if needed. */ static void pvscsi_map_buffers(struct pvscsi_adapter *adapter, struct pvscsi_ctx *ctx, struct scsi_cmnd *cmd, struct PVSCSIRingReqDesc *e) { unsigned count; unsigned bufflen = scsi_bufflen(cmd); struct scatterlist *sg; e->dataLen = bufflen; e->dataAddr = 0; if (bufflen == 0) return; sg = scsi_sglist(cmd); count = scsi_sg_count(cmd); if (count != 0) { int segs = scsi_dma_map(cmd); if (segs > 1) { pvscsi_create_sg(ctx, sg, segs); e->flags |= PVSCSI_FLAG_CMD_WITH_SG_LIST; ctx->sglPA = pci_map_single(adapter->dev, ctx->sgl, SGL_SIZE, PCI_DMA_TODEVICE); e->dataAddr = ctx->sglPA; } else e->dataAddr = sg_dma_address(sg); } else { /* * In case there is no S/G list, scsi_sglist points * directly to the buffer. */ ctx->dataPA = pci_map_single(adapter->dev, sg, bufflen, cmd->sc_data_direction); e->dataAddr = ctx->dataPA; } } static void pvscsi_unmap_buffers(const struct pvscsi_adapter *adapter, struct pvscsi_ctx *ctx) { struct scsi_cmnd *cmd; unsigned bufflen; cmd = ctx->cmd; bufflen = scsi_bufflen(cmd); if (bufflen != 0) { unsigned count = scsi_sg_count(cmd); if (count != 0) { scsi_dma_unmap(cmd); if (ctx->sglPA) { pci_unmap_single(adapter->dev, ctx->sglPA, SGL_SIZE, PCI_DMA_TODEVICE); ctx->sglPA = 0; } } else pci_unmap_single(adapter->dev, ctx->dataPA, bufflen, cmd->sc_data_direction); } if (cmd->sense_buffer) pci_unmap_single(adapter->dev, ctx->sensePA, SCSI_SENSE_BUFFERSIZE, PCI_DMA_FROMDEVICE); } static int __devinit pvscsi_allocate_rings(struct pvscsi_adapter *adapter) { adapter->rings_state = pci_alloc_consistent(adapter->dev, PAGE_SIZE, &adapter->ringStatePA); if (!adapter->rings_state) return -ENOMEM; adapter->req_pages = min(PVSCSI_MAX_NUM_PAGES_REQ_RING, pvscsi_ring_pages); adapter->req_depth = adapter->req_pages * PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE; adapter->req_ring = pci_alloc_consistent(adapter->dev, adapter->req_pages * PAGE_SIZE, &adapter->reqRingPA); if (!adapter->req_ring) return -ENOMEM; adapter->cmp_pages = min(PVSCSI_MAX_NUM_PAGES_CMP_RING, pvscsi_ring_pages); adapter->cmp_ring = pci_alloc_consistent(adapter->dev, adapter->cmp_pages * PAGE_SIZE, &adapter->cmpRingPA); if (!adapter->cmp_ring) return -ENOMEM; BUG_ON(!IS_ALIGNED(adapter->ringStatePA, PAGE_SIZE)); BUG_ON(!IS_ALIGNED(adapter->reqRingPA, PAGE_SIZE)); BUG_ON(!IS_ALIGNED(adapter->cmpRingPA, PAGE_SIZE)); if (!adapter->use_msg) return 0; adapter->msg_pages = min(PVSCSI_MAX_NUM_PAGES_MSG_RING, pvscsi_msg_ring_pages); adapter->msg_ring = pci_alloc_consistent(adapter->dev, adapter->msg_pages * PAGE_SIZE, &adapter->msgRingPA); if (!adapter->msg_ring) return -ENOMEM; BUG_ON(!IS_ALIGNED(adapter->msgRingPA, PAGE_SIZE)); return 0; } static void pvscsi_setup_all_rings(const struct pvscsi_adapter *adapter) { struct PVSCSICmdDescSetupRings cmd = { 0 }; dma_addr_t base; unsigned i; cmd.ringsStatePPN = adapter->ringStatePA >> PAGE_SHIFT; cmd.reqRingNumPages = adapter->req_pages; cmd.cmpRingNumPages = adapter->cmp_pages; base = adapter->reqRingPA; for (i = 0; i < adapter->req_pages; i++) { cmd.reqRingPPNs[i] = base >> PAGE_SHIFT; base += PAGE_SIZE; } base = adapter->cmpRingPA; for (i = 0; i < adapter->cmp_pages; i++) { cmd.cmpRingPPNs[i] = base >> PAGE_SHIFT; base += PAGE_SIZE; } memset(adapter->rings_state, 0, PAGE_SIZE); memset(adapter->req_ring, 0, adapter->req_pages * PAGE_SIZE); memset(adapter->cmp_ring, 0, adapter->cmp_pages * PAGE_SIZE); pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_SETUP_RINGS, &cmd, sizeof(cmd)); if (adapter->use_msg) { struct PVSCSICmdDescSetupMsgRing cmd_msg = { 0 }; cmd_msg.numPages = adapter->msg_pages; base = adapter->msgRingPA; for (i = 0; i < adapter->msg_pages; i++) { cmd_msg.ringPPNs[i] = base >> PAGE_SHIFT; base += PAGE_SIZE; } memset(adapter->msg_ring, 0, adapter->msg_pages * PAGE_SIZE); pvscsi_write_cmd_desc(adapter, PVSCSI_CMD_SETUP_MSG_RING, &cmd_msg, sizeof(cmd_msg)); } } /* * Pull a completion descriptor off and pass the completion back * to the SCSI mid layer. */ static void pvscsi_complete_request(struct pvscsi_adapter *adapter, const struct PVSCSIRingCmpDesc *e) { struct pvscsi_ctx *ctx; struct scsi_cmnd *cmd; u32 btstat = e->hostStatus; u32 sdstat = e->scsiStatus; ctx = pvscsi_get_context(adapter, e->context); cmd = ctx->cmd; pvscsi_unmap_buffers(adapter, ctx); pvscsi_release_context(adapter, ctx); cmd->result = 0; if (sdstat != SAM_STAT_GOOD && (btstat == BTSTAT_SUCCESS || btstat == BTSTAT_LINKED_COMMAND_COMPLETED || btstat == BTSTAT_LINKED_COMMAND_COMPLETED_WITH_FLAG)) { cmd->result = (DID_OK << 16) | sdstat; if (sdstat == SAM_STAT_CHECK_CONDITION && cmd->sense_buffer) cmd->result |= (DRIVER_SENSE << 24); } else switch (btstat) { case BTSTAT_SUCCESS: case BTSTAT_LINKED_COMMAND_COMPLETED: case BTSTAT_LINKED_COMMAND_COMPLETED_WITH_FLAG: /* If everything went fine, let's move on.. */ cmd->result = (DID_OK << 16); break; case BTSTAT_DATARUN: case BTSTAT_DATA_UNDERRUN: /* Report residual data in underruns */ scsi_set_resid(cmd, scsi_bufflen(cmd) - e->dataLen); cmd->result = (DID_ERROR << 16); break; case BTSTAT_SELTIMEO: /* Our emulation returns this for non-connected devs */ cmd->result = (DID_BAD_TARGET << 16); break; case BTSTAT_LUNMISMATCH: case BTSTAT_TAGREJECT: case BTSTAT_BADMSG: cmd->result = (DRIVER_INVALID << 24); /* fall through */ case BTSTAT_HAHARDWARE: case BTSTAT_INVPHASE: case BTSTAT_HATIMEOUT: case BTSTAT_NORESPONSE: case BTSTAT_DISCONNECT: case BTSTAT_HASOFTWARE: case BTSTAT_BUSFREE: case BTSTAT_SENSFAILED: cmd->result |= (DID_ERROR << 16); break; case BTSTAT_SENTRST: case BTSTAT_RECVRST: case BTSTAT_BUSRESET: cmd->result = (DID_RESET << 16); break; case BTSTAT_ABORTQUEUE: cmd->result = (DID_ABORT << 16); break; case BTSTAT_SCSIPARITY: cmd->result = (DID_PARITY << 16); break; default: cmd->result = (DID_ERROR << 16); scmd_printk(KERN_DEBUG, cmd, "Unknown completion status: 0x%x\n", btstat); } dev_dbg(&cmd->device->sdev_gendev, "cmd=%p %x ctx=%p result=0x%x status=0x%x,%x\n", cmd, cmd->cmnd[0], ctx, cmd->result, btstat, sdstat); cmd->scsi_done(cmd); } /* * barrier usage : Since the PVSCSI device is emulated, there could be cases * where we may want to serialize some accesses between the driver and the * emulation layer. We use compiler barriers instead of the more expensive * memory barriers because PVSCSI is only supported on X86 which has strong * memory access ordering. */ static void pvscsi_process_completion_ring(struct pvscsi_adapter *adapter) { struct PVSCSIRingsState *s = adapter->rings_state; struct PVSCSIRingCmpDesc *ring = adapter->cmp_ring; u32 cmp_entries = s->cmpNumEntriesLog2; while (s->cmpConsIdx != s->cmpProdIdx) { struct PVSCSIRingCmpDesc *e = ring + (s->cmpConsIdx & MASK(cmp_entries)); /* * This barrier() ensures that *e is not dereferenced while * the device emulation still writes data into the slot. * Since the device emulation advances s->cmpProdIdx only after * updating the slot we want to check it first. */ barrier(); pvscsi_complete_request(adapter, e); /* * This barrier() ensures that compiler doesn't reorder write * to s->cmpConsIdx before the read of (*e) inside * pvscsi_complete_request. Otherwise, device emulation may * overwrite *e before we had a chance to read it. */ barrier(); s->cmpConsIdx++; } } /* * Translate a Linux SCSI request into a request ring entry. */ static int pvscsi_queue_ring(struct pvscsi_adapter *adapter, struct pvscsi_ctx *ctx, struct scsi_cmnd *cmd) { struct PVSCSIRingsState *s; struct PVSCSIRingReqDesc *e; struct scsi_device *sdev; u32 req_entries; s = adapter->rings_state; sdev = cmd->device; req_entries = s->reqNumEntriesLog2; /* * If this condition holds, we might have room on the request ring, but * we might not have room on the completion ring for the response. * However, we have already ruled out this possibility - we would not * have successfully allocated a context if it were true, since we only * have one context per request entry. Check for it anyway, since it * would be a serious bug. */ if (s->reqProdIdx - s->cmpConsIdx >= 1 << req_entries) { scmd_printk(KERN_ERR, cmd, "vmw_pvscsi: " "ring full: reqProdIdx=%d cmpConsIdx=%d\n", s->reqProdIdx, s->cmpConsIdx); return -1; } e = adapter->req_ring + (s->reqProdIdx & MASK(req_entries)); e->bus = sdev->channel; e->target = sdev->id; memset(e->lun, 0, sizeof(e->lun)); e->lun[1] = sdev->lun; if (cmd->sense_buffer) { ctx->sensePA = pci_map_single(adapter->dev, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE, PCI_DMA_FROMDEVICE); e->senseAddr = ctx->sensePA; e->senseLen = SCSI_SENSE_BUFFERSIZE; } else { e->senseLen = 0; e->senseAddr = 0; } e->cdbLen = cmd->cmd_len; e->vcpuHint = smp_processor_id(); memcpy(e->cdb, cmd->cmnd, e->cdbLen); e->tag = SIMPLE_QUEUE_TAG; if (sdev->tagged_supported && (cmd->tag == HEAD_OF_QUEUE_TAG || cmd->tag == ORDERED_QUEUE_TAG)) e->tag = cmd->tag; if (cmd->sc_data_direction == DMA_FROM_DEVICE) e->flags = PVSCSI_FLAG_CMD_DIR_TOHOST; else if (cmd->sc_data_direction == DMA_TO_DEVICE) e->flags = PVSCSI_FLAG_CMD_DIR_TODEVICE; else if (cmd->sc_data_direction == DMA_NONE) e->flags = PVSCSI_FLAG_CMD_DIR_NONE; else e->flags = 0; pvscsi_map_buffers(adapter, ctx, cmd, e); e->context = pvscsi_map_context(adapter, ctx); barrier(); s->reqProdIdx++; return 0; } static int pvscsi_queue(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *)) { struct Scsi_Host *host = cmd->device->host; struct pvscsi_adapter *adapter = shost_priv(host); struct pvscsi_ctx *ctx; unsigned long flags; spin_lock_irqsave(&adapter->hw_lock, flags); ctx = pvscsi_acquire_context(adapter, cmd); if (!ctx || pvscsi_queue_ring(adapter, ctx, cmd) != 0) { if (ctx) pvscsi_release_context(adapter, ctx); spin_unlock_irqrestore(&adapter->hw_lock, flags); return SCSI_MLQUEUE_HOST_BUSY; } cmd->scsi_done = done; dev_dbg(&cmd->device->sdev_gendev, "queued cmd %p, ctx %p, op=%x\n", cmd, ctx, cmd->cmnd[0]); spin_unlock_irqrestore(&adapter->hw_lock, flags); pvscsi_kick_io(adapter, cmd->cmnd[0]); return 0; } static int pvscsi_abort(struct scsi_cmnd *cmd) { struct pvscsi_adapter *adapter = shost_priv(cmd->device->host); struct pvscsi_ctx *ctx; unsigned long flags; scmd_printk(KERN_DEBUG, cmd, "task abort on host %u, %p\n", adapter->host->host_no, cmd); spin_lock_irqsave(&adapter->hw_lock, flags); /* * Poll the completion ring first - we might be trying to abort * a command that is waiting to be dispatched in the completion ring. */ pvscsi_process_completion_ring(adapter); /* * If there is no context for the command, it either already succeeded * or else was never properly issued. Not our problem. */ ctx = pvscsi_find_context(adapter, cmd); if (!ctx) { scmd_printk(KERN_DEBUG, cmd, "Failed to abort cmd %p\n", cmd); goto out; } pvscsi_abort_cmd(adapter, ctx); pvscsi_process_completion_ring(adapter); out: spin_unlock_irqrestore(&adapter->hw_lock, flags); return SUCCESS; } /* * Abort all outstanding requests. This is only safe to use if the completion * ring will never be walked again or the device has been reset, because it * destroys the 1-1 mapping between context field passed to emulation and our * request structure. */ static void pvscsi_reset_all(struct pvscsi_adapter *adapter) { unsigned i; for (i = 0; i < adapter->req_depth; i++) { struct pvscsi_ctx *ctx = &adapter->cmd_map[i]; struct scsi_cmnd *cmd = ctx->cmd; if (cmd) { scmd_printk(KERN_ERR, cmd, "Forced reset on cmd %p\n", cmd); pvscsi_unmap_buffers(adapter, ctx); pvscsi_release_context(adapter, ctx); cmd->result = (DID_RESET << 16); cmd->scsi_done(cmd); } } } static int pvscsi_host_reset(struct scsi_cmnd *cmd) { struct Scsi_Host *host = cmd->device->host; struct pvscsi_adapter *adapter = shost_priv(host); unsigned long flags; bool use_msg; scmd_printk(KERN_INFO, cmd, "SCSI Host reset\n"); spin_lock_irqsave(&adapter->hw_lock, flags); use_msg = adapter->use_msg; if (use_msg) { adapter->use_msg = 0; spin_unlock_irqrestore(&adapter->hw_lock, flags); /* * Now that we know that the ISR won't add more work on the * workqueue we can safely flush any outstanding work. */ flush_workqueue(adapter->workqueue); spin_lock_irqsave(&adapter->hw_lock, flags); } /* * We're going to tear down the entire ring structure and set it back * up, so stalling new requests until all completions are flushed and * the rings are back in place. */ pvscsi_process_request_ring(adapter); ll_adapter_reset(adapter); /* * Now process any completions. Note we do this AFTER adapter reset, * which is strange, but stops races where completions get posted * between processing the ring and issuing the reset. The backend will * not touch the ring memory after reset, so the immediately pre-reset * completion ring state is still valid. */ pvscsi_process_completion_ring(adapter); pvscsi_reset_all(adapter); adapter->use_msg = use_msg; pvscsi_setup_all_rings(adapter); pvscsi_unmask_intr(adapter); spin_unlock_irqrestore(&adapter->hw_lock, flags); return SUCCESS; } static int pvscsi_bus_reset(struct scsi_cmnd *cmd) { struct Scsi_Host *host = cmd->device->host; struct pvscsi_adapter *adapter = shost_priv(host); unsigned long flags; scmd_printk(KERN_INFO, cmd, "SCSI Bus reset\n"); /* * We don't want to queue new requests for this bus after * flushing all pending requests to emulation, since new * requests could then sneak in during this bus reset phase, * so take the lock now. */ spin_lock_irqsave(&adapter->hw_lock, flags); pvscsi_process_request_ring(adapter); ll_bus_reset(adapter); pvscsi_process_completion_ring(adapter); spin_unlock_irqrestore(&adapter->hw_lock, flags); return SUCCESS; } static int pvscsi_device_reset(struct scsi_cmnd *cmd) { struct Scsi_Host *host = cmd->device->host; struct pvscsi_adapter *adapter = shost_priv(host); unsigned long flags; scmd_printk(KERN_INFO, cmd, "SCSI device reset on scsi%u:%u\n", host->host_no, cmd->device->id); /* * We don't want to queue new requests for this device after flushing * all pending requests to emulation, since new requests could then * sneak in during this device reset phase, so take the lock now. */ spin_lock_irqsave(&adapter->hw_lock, flags); pvscsi_process_request_ring(adapter); ll_device_reset(adapter, cmd->device->id); pvscsi_process_completion_ring(adapter); spin_unlock_irqrestore(&adapter->hw_lock, flags); return SUCCESS; } static struct scsi_host_template pvscsi_template; static const char *pvscsi_info(struct Scsi_Host *host) { struct pvscsi_adapter *adapter = shost_priv(host); static char buf[256]; sprintf(buf, "VMware PVSCSI storage adapter rev %d, req/cmp/msg rings: " "%u/%u/%u pages, cmd_per_lun=%u", adapter->rev, adapter->req_pages, adapter->cmp_pages, adapter->msg_pages, pvscsi_template.cmd_per_lun); return buf; } static struct scsi_host_template pvscsi_template = { .module = THIS_MODULE, .name = "VMware PVSCSI Host Adapter", .proc_name = "vmw_pvscsi", .info = pvscsi_info, .queuecommand = pvscsi_queue, .this_id = -1, .sg_tablesize = PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT, .dma_boundary = UINT_MAX, .max_sectors = 0xffff, .use_clustering = ENABLE_CLUSTERING, .eh_abort_handler = pvscsi_abort, .eh_device_reset_handler = pvscsi_device_reset, .eh_bus_reset_handler = pvscsi_bus_reset, .eh_host_reset_handler = pvscsi_host_reset, }; static void pvscsi_process_msg(const struct pvscsi_adapter *adapter, const struct PVSCSIRingMsgDesc *e) { struct PVSCSIRingsState *s = adapter->rings_state; struct Scsi_Host *host = adapter->host; struct scsi_device *sdev; printk(KERN_INFO "vmw_pvscsi: msg type: 0x%x - MSG RING: %u/%u (%u) \n", e->type, s->msgProdIdx, s->msgConsIdx, s->msgNumEntriesLog2); BUILD_BUG_ON(PVSCSI_MSG_LAST != 2); if (e->type == PVSCSI_MSG_DEV_ADDED) { struct PVSCSIMsgDescDevStatusChanged *desc; desc = (struct PVSCSIMsgDescDevStatusChanged *)e; printk(KERN_INFO "vmw_pvscsi: msg: device added at scsi%u:%u:%u\n", desc->bus, desc->target, desc->lun[1]); if (!scsi_host_get(host)) return; sdev = scsi_device_lookup(host, desc->bus, desc->target, desc->lun[1]); if (sdev) { printk(KERN_INFO "vmw_pvscsi: device already exists\n"); scsi_device_put(sdev); } else scsi_add_device(adapter->host, desc->bus, desc->target, desc->lun[1]); scsi_host_put(host); } else if (e->type == PVSCSI_MSG_DEV_REMOVED) { struct PVSCSIMsgDescDevStatusChanged *desc; desc = (struct PVSCSIMsgDescDevStatusChanged *)e; printk(KERN_INFO "vmw_pvscsi: msg: device removed at scsi%u:%u:%u\n", desc->bus, desc->target, desc->lun[1]); if (!scsi_host_get(host)) return; sdev = scsi_device_lookup(host, desc->bus, desc->target, desc->lun[1]); if (sdev) { scsi_remove_device(sdev); scsi_device_put(sdev); } else printk(KERN_INFO "vmw_pvscsi: failed to lookup scsi%u:%u:%u\n", desc->bus, desc->target, desc->lun[1]); scsi_host_put(host); } } static int pvscsi_msg_pending(const struct pvscsi_adapter *adapter) { struct PVSCSIRingsState *s = adapter->rings_state; return s->msgProdIdx != s->msgConsIdx; } static void pvscsi_process_msg_ring(const struct pvscsi_adapter *adapter) { struct PVSCSIRingsState *s = adapter->rings_state; struct PVSCSIRingMsgDesc *ring = adapter->msg_ring; u32 msg_entries = s->msgNumEntriesLog2; while (pvscsi_msg_pending(adapter)) { struct PVSCSIRingMsgDesc *e = ring + (s->msgConsIdx & MASK(msg_entries)); barrier(); pvscsi_process_msg(adapter, e); barrier(); s->msgConsIdx++; } } static void pvscsi_msg_workqueue_handler(struct work_struct *data) { struct pvscsi_adapter *adapter; adapter = container_of(data, struct pvscsi_adapter, work); pvscsi_process_msg_ring(adapter); } static int pvscsi_setup_msg_workqueue(struct pvscsi_adapter *adapter) { char name[32]; if (!pvscsi_use_msg) return 0; pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_COMMAND, PVSCSI_CMD_SETUP_MSG_RING); if (pvscsi_reg_read(adapter, PVSCSI_REG_OFFSET_COMMAND_STATUS) == -1) return 0; snprintf(name, sizeof(name), "vmw_pvscsi_wq_%u", adapter->host->host_no); adapter->workqueue = create_singlethread_workqueue(name); if (!adapter->workqueue) { printk(KERN_ERR "vmw_pvscsi: failed to create work queue\n"); return 0; } INIT_WORK(&adapter->work, pvscsi_msg_workqueue_handler); return 1; } static irqreturn_t pvscsi_isr(int irq, void *devp) { struct pvscsi_adapter *adapter = devp; int handled; if (adapter->use_msi || adapter->use_msix) handled = true; else { u32 val = pvscsi_read_intr_status(adapter); handled = (val & PVSCSI_INTR_ALL_SUPPORTED) != 0; if (handled) pvscsi_write_intr_status(devp, val); } if (handled) { unsigned long flags; spin_lock_irqsave(&adapter->hw_lock, flags); pvscsi_process_completion_ring(adapter); if (adapter->use_msg && pvscsi_msg_pending(adapter)) queue_work(adapter->workqueue, &adapter->work); spin_unlock_irqrestore(&adapter->hw_lock, flags); } return IRQ_RETVAL(handled); } static void pvscsi_free_sgls(const struct pvscsi_adapter *adapter) { struct pvscsi_ctx *ctx = adapter->cmd_map; unsigned i; for (i = 0; i < adapter->req_depth; ++i, ++ctx) free_pages((unsigned long)ctx->sgl, get_order(SGL_SIZE)); } static int pvscsi_setup_msix(const struct pvscsi_adapter *adapter, int *irq) { struct msix_entry entry = { 0, PVSCSI_VECTOR_COMPLETION }; int ret; ret = pci_enable_msix(adapter->dev, &entry, 1); if (ret) return ret; *irq = entry.vector; return 0; } static void pvscsi_shutdown_intr(struct pvscsi_adapter *adapter) { if (adapter->irq) { free_irq(adapter->irq, adapter); adapter->irq = 0; } if (adapter->use_msi) { pci_disable_msi(adapter->dev); adapter->use_msi = 0; } else if (adapter->use_msix) { pci_disable_msix(adapter->dev); adapter->use_msix = 0; } } static void pvscsi_release_resources(struct pvscsi_adapter *adapter) { pvscsi_shutdown_intr(adapter); if (adapter->workqueue) destroy_workqueue(adapter->workqueue); if (adapter->mmioBase) pci_iounmap(adapter->dev, adapter->mmioBase); pci_release_regions(adapter->dev); if (adapter->cmd_map) { pvscsi_free_sgls(adapter); kfree(adapter->cmd_map); } if (adapter->rings_state) pci_free_consistent(adapter->dev, PAGE_SIZE, adapter->rings_state, adapter->ringStatePA); if (adapter->req_ring) pci_free_consistent(adapter->dev, adapter->req_pages * PAGE_SIZE, adapter->req_ring, adapter->reqRingPA); if (adapter->cmp_ring) pci_free_consistent(adapter->dev, adapter->cmp_pages * PAGE_SIZE, adapter->cmp_ring, adapter->cmpRingPA); if (adapter->msg_ring) pci_free_consistent(adapter->dev, adapter->msg_pages * PAGE_SIZE, adapter->msg_ring, adapter->msgRingPA); } /* * Allocate scatter gather lists. * * These are statically allocated. Trying to be clever was not worth it. * * Dynamic allocation can fail, and we can't go deeep into the memory * allocator, since we're a SCSI driver, and trying too hard to allocate * memory might generate disk I/O. We also don't want to fail disk I/O * in that case because we can't get an allocation - the I/O could be * trying to swap out data to free memory. Since that is pathological, * just use a statically allocated scatter list. * */ static int __devinit pvscsi_allocate_sg(struct pvscsi_adapter *adapter) { struct pvscsi_ctx *ctx; int i; ctx = adapter->cmd_map; BUILD_BUG_ON(sizeof(struct pvscsi_sg_list) > SGL_SIZE); for (i = 0; i < adapter->req_depth; ++i, ++ctx) { ctx->sgl = (void *)__get_free_pages(GFP_KERNEL, get_order(SGL_SIZE)); ctx->sglPA = 0; BUG_ON(!IS_ALIGNED(((unsigned long)ctx->sgl), PAGE_SIZE)); if (!ctx->sgl) { for (; i >= 0; --i, --ctx) { free_pages((unsigned long)ctx->sgl, get_order(SGL_SIZE)); ctx->sgl = NULL; } return -ENOMEM; } } return 0; } static int __devinit pvscsi_probe(struct pci_dev *pdev, const struct pci_device_id *id) { struct pvscsi_adapter *adapter; struct Scsi_Host *host; unsigned int i; unsigned long flags = 0; int error; error = -ENODEV; if (pci_enable_device(pdev)) return error; if (pci_set_dma_mask(pdev, DMA_BIT_MASK(64)) == 0 && pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64)) == 0) { printk(KERN_INFO "vmw_pvscsi: using 64bit dma\n"); } else if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32)) == 0 && pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)) == 0) { printk(KERN_INFO "vmw_pvscsi: using 32bit dma\n"); } else { printk(KERN_ERR "vmw_pvscsi: failed to set DMA mask\n"); goto out_disable_device; } pvscsi_template.can_queue = min(PVSCSI_MAX_NUM_PAGES_REQ_RING, pvscsi_ring_pages) * PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE; pvscsi_template.cmd_per_lun = min(pvscsi_template.can_queue, pvscsi_cmd_per_lun); host = scsi_host_alloc(&pvscsi_template, sizeof(struct pvscsi_adapter)); if (!host) { printk(KERN_ERR "vmw_pvscsi: failed to allocate host\n"); goto out_disable_device; } adapter = shost_priv(host); memset(adapter, 0, sizeof(*adapter)); adapter->dev = pdev; adapter->host = host; spin_lock_init(&adapter->hw_lock); host->max_channel = 0; host->max_id = 16; host->max_lun = 1; host->max_cmd_len = 16; adapter->rev = pdev->revision; if (pci_request_regions(pdev, "vmw_pvscsi")) { printk(KERN_ERR "vmw_pvscsi: pci memory selection failed\n"); goto out_free_host; } for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { if ((pci_resource_flags(pdev, i) & PCI_BASE_ADDRESS_SPACE_IO)) continue; if (pci_resource_len(pdev, i) < PVSCSI_MEM_SPACE_SIZE) continue; break; } if (i == DEVICE_COUNT_RESOURCE) { printk(KERN_ERR "vmw_pvscsi: adapter has no suitable MMIO region\n"); goto out_release_resources; } adapter->mmioBase = pci_iomap(pdev, i, PVSCSI_MEM_SPACE_SIZE); if (!adapter->mmioBase) { printk(KERN_ERR "vmw_pvscsi: can't iomap for BAR %d memsize %lu\n", i, PVSCSI_MEM_SPACE_SIZE); goto out_release_resources; } pci_set_master(pdev); pci_set_drvdata(pdev, host); ll_adapter_reset(adapter); adapter->use_msg = pvscsi_setup_msg_workqueue(adapter); error = pvscsi_allocate_rings(adapter); if (error) { printk(KERN_ERR "vmw_pvscsi: unable to allocate ring memory\n"); goto out_release_resources; } /* * From this point on we should reset the adapter if anything goes * wrong. */ pvscsi_setup_all_rings(adapter); adapter->cmd_map = kcalloc(adapter->req_depth, sizeof(struct pvscsi_ctx), GFP_KERNEL); if (!adapter->cmd_map) { printk(KERN_ERR "vmw_pvscsi: failed to allocate memory.\n"); error = -ENOMEM; goto out_reset_adapter; } INIT_LIST_HEAD(&adapter->cmd_pool); for (i = 0; i < adapter->req_depth; i++) { struct pvscsi_ctx *ctx = adapter->cmd_map + i; list_add(&ctx->list, &adapter->cmd_pool); } error = pvscsi_allocate_sg(adapter); if (error) { printk(KERN_ERR "vmw_pvscsi: unable to allocate s/g table\n"); goto out_reset_adapter; } if (!pvscsi_disable_msix && pvscsi_setup_msix(adapter, &adapter->irq) == 0) { printk(KERN_INFO "vmw_pvscsi: using MSI-X\n"); adapter->use_msix = 1; } else if (!pvscsi_disable_msi && pci_enable_msi(pdev) == 0) { printk(KERN_INFO "vmw_pvscsi: using MSI\n"); adapter->use_msi = 1; adapter->irq = pdev->irq; } else { printk(KERN_INFO "vmw_pvscsi: using INTx\n"); adapter->irq = pdev->irq; flags = IRQF_SHARED; } error = request_irq(adapter->irq, pvscsi_isr, flags, "vmw_pvscsi", adapter); if (error) { printk(KERN_ERR "vmw_pvscsi: unable to request IRQ: %d\n", error); adapter->irq = 0; goto out_reset_adapter; } error = scsi_add_host(host, &pdev->dev); if (error) { printk(KERN_ERR "vmw_pvscsi: scsi_add_host failed: %d\n", error); goto out_reset_adapter; } dev_info(&pdev->dev, "VMware PVSCSI rev %d host #%u\n", adapter->rev, host->host_no); pvscsi_unmask_intr(adapter); scsi_scan_host(host); return 0; out_reset_adapter: ll_adapter_reset(adapter); out_release_resources: pvscsi_release_resources(adapter); out_free_host: scsi_host_put(host); out_disable_device: pci_set_drvdata(pdev, NULL); pci_disable_device(pdev); return error; } static void __pvscsi_shutdown(struct pvscsi_adapter *adapter) { pvscsi_mask_intr(adapter); if (adapter->workqueue) flush_workqueue(adapter->workqueue); pvscsi_shutdown_intr(adapter); pvscsi_process_request_ring(adapter); pvscsi_process_completion_ring(adapter); ll_adapter_reset(adapter); } static void pvscsi_shutdown(struct pci_dev *dev) { struct Scsi_Host *host = pci_get_drvdata(dev); struct pvscsi_adapter *adapter = shost_priv(host); __pvscsi_shutdown(adapter); } static void pvscsi_remove(struct pci_dev *pdev) { struct Scsi_Host *host = pci_get_drvdata(pdev); struct pvscsi_adapter *adapter = shost_priv(host); scsi_remove_host(host); __pvscsi_shutdown(adapter); pvscsi_release_resources(adapter); scsi_host_put(host); pci_set_drvdata(pdev, NULL); pci_disable_device(pdev); } static struct pci_driver pvscsi_pci_driver = { .name = "vmw_pvscsi", .id_table = pvscsi_pci_tbl, .probe = pvscsi_probe, .remove = __devexit_p(pvscsi_remove), .shutdown = pvscsi_shutdown, }; static int __init pvscsi_init(void) { pr_info("%s - version %s\n", PVSCSI_LINUX_DRIVER_DESC, PVSCSI_DRIVER_VERSION_STRING); return pci_register_driver(&pvscsi_pci_driver); } static void __exit pvscsi_exit(void) { pci_unregister_driver(&pvscsi_pci_driver); } module_init(pvscsi_init); module_exit(pvscsi_exit); |