1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * SAS host prototypes and structures header file 4 * 5 * Copyright (C) 2005 Adaptec, Inc. All rights reserved. 6 * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com> 7 */ 8 9 #ifndef _LIBSAS_H_ 10 #define _LIBSAS_H_ 11 12 13 #include <linux/timer.h> 14 #include <linux/pci.h> 15 #include <scsi/sas.h> 16 #include <linux/libata.h> 17 #include <linux/list.h> 18 #include <scsi/scsi_device.h> 19 #include <scsi/scsi_cmnd.h> 20 #include <scsi/scsi_transport_sas.h> 21 #include <linux/scatterlist.h> 22 #include <linux/slab.h> 23 24 struct block_device; 25 26 enum sas_class { 27 SAS, 28 EXPANDER 29 }; 30 31 enum sas_phy_role { 32 PHY_ROLE_NONE = 0, 33 PHY_ROLE_TARGET = 0x40, 34 PHY_ROLE_INITIATOR = 0x80, 35 }; 36 37 enum sas_phy_type { 38 PHY_TYPE_PHYSICAL, 39 PHY_TYPE_VIRTUAL 40 }; 41 42 /* The events are mnemonically described in sas_dump.c 43 * so when updating/adding events here, please also 44 * update the other file too. 45 */ 46 enum port_event { 47 PORTE_BYTES_DMAED = 0U, 48 PORTE_BROADCAST_RCVD, 49 PORTE_LINK_RESET_ERR, 50 PORTE_TIMER_EVENT, 51 PORTE_HARD_RESET, 52 PORT_NUM_EVENTS, 53 }; 54 55 enum phy_event { 56 PHYE_LOSS_OF_SIGNAL = 0U, 57 PHYE_OOB_DONE, 58 PHYE_OOB_ERROR, 59 PHYE_SPINUP_HOLD, /* hot plug SATA, no COMWAKE sent */ 60 PHYE_RESUME_TIMEOUT, 61 PHYE_SHUTDOWN, 62 PHY_NUM_EVENTS, 63 }; 64 65 enum discover_event { 66 DISCE_DISCOVER_DOMAIN = 0U, 67 DISCE_REVALIDATE_DOMAIN, 68 DISCE_SUSPEND, 69 DISCE_RESUME, 70 DISC_NUM_EVENTS, 71 }; 72 73 /* ---------- Expander Devices ---------- */ 74 75 #define to_dom_device(_obj) container_of(_obj, struct domain_device, dev_obj) 76 #define to_dev_attr(_attr) container_of(_attr, struct domain_dev_attribute,\ 77 attr) 78 79 enum routing_attribute { 80 DIRECT_ROUTING, 81 SUBTRACTIVE_ROUTING, 82 TABLE_ROUTING, 83 }; 84 85 enum ex_phy_state { 86 PHY_EMPTY, 87 PHY_VACANT, 88 PHY_NOT_PRESENT, 89 PHY_DEVICE_DISCOVERED 90 }; 91 92 struct ex_phy { 93 int phy_id; 94 95 enum ex_phy_state phy_state; 96 97 enum sas_device_type attached_dev_type; 98 enum sas_linkrate linkrate; 99 100 u8 attached_sata_host:1; 101 u8 attached_sata_dev:1; 102 u8 attached_sata_ps:1; 103 104 enum sas_protocol attached_tproto; 105 enum sas_protocol attached_iproto; 106 107 u8 attached_sas_addr[SAS_ADDR_SIZE]; 108 u8 attached_phy_id; 109 110 int phy_change_count; 111 enum routing_attribute routing_attr; 112 u8 virtual:1; 113 114 int last_da_index; 115 116 struct sas_phy *phy; 117 struct sas_port *port; 118 }; 119 120 struct expander_device { 121 struct list_head children; 122 123 int ex_change_count; 124 u16 max_route_indexes; 125 u8 num_phys; 126 127 u8 t2t_supp:1; 128 u8 configuring:1; 129 u8 conf_route_table:1; 130 131 u8 enclosure_logical_id[8]; 132 133 struct ex_phy *ex_phy; 134 struct sas_port *parent_port; 135 136 struct mutex cmd_mutex; 137 }; 138 139 /* ---------- SATA device ---------- */ 140 #define ATA_RESP_FIS_SIZE 24 141 142 struct sata_device { 143 unsigned int class; 144 u8 port_no; /* port number, if this is a PM (Port) */ 145 146 struct ata_port *ap; 147 struct ata_host *ata_host; 148 struct smp_resp rps_resp ____cacheline_aligned; /* report_phy_sata_resp */ 149 u8 fis[ATA_RESP_FIS_SIZE]; 150 }; 151 152 struct ssp_device { 153 struct list_head eh_list_node; /* pending a user requested eh action */ 154 struct scsi_lun reset_lun; 155 }; 156 157 enum { 158 SAS_DEV_GONE, 159 SAS_DEV_FOUND, /* device notified to lldd */ 160 SAS_DEV_DESTROY, 161 SAS_DEV_EH_PENDING, 162 SAS_DEV_LU_RESET, 163 SAS_DEV_RESET, 164 }; 165 166 struct domain_device { 167 spinlock_t done_lock; 168 enum sas_device_type dev_type; 169 170 enum sas_linkrate linkrate; 171 enum sas_linkrate min_linkrate; 172 enum sas_linkrate max_linkrate; 173 174 int pathways; 175 176 struct domain_device *parent; 177 struct list_head siblings; /* devices on the same level */ 178 struct asd_sas_port *port; /* shortcut to root of the tree */ 179 struct sas_phy *phy; 180 181 struct list_head dev_list_node; 182 struct list_head disco_list_node; /* awaiting probe or destruct */ 183 184 enum sas_protocol iproto; 185 enum sas_protocol tproto; 186 187 struct sas_rphy *rphy; 188 189 u8 sas_addr[SAS_ADDR_SIZE]; 190 u8 hashed_sas_addr[HASHED_SAS_ADDR_SIZE]; 191 192 u8 frame_rcvd[32]; 193 194 union { 195 struct expander_device ex_dev; 196 struct sata_device sata_dev; /* STP & directly attached */ 197 struct ssp_device ssp_dev; 198 }; 199 200 void *lldd_dev; 201 unsigned long state; 202 struct kref kref; 203 }; 204 205 struct sas_work { 206 struct list_head drain_node; 207 struct work_struct work; 208 }; 209 210 static inline bool dev_is_expander(enum sas_device_type type) 211 { 212 return type == SAS_EDGE_EXPANDER_DEVICE || 213 type == SAS_FANOUT_EXPANDER_DEVICE; 214 } 215 216 static inline void INIT_SAS_WORK(struct sas_work *sw, void (*fn)(struct work_struct *)) 217 { 218 INIT_WORK(&sw->work, fn); 219 INIT_LIST_HEAD(&sw->drain_node); 220 } 221 222 struct sas_discovery_event { 223 struct sas_work work; 224 struct asd_sas_port *port; 225 }; 226 227 static inline struct sas_discovery_event *to_sas_discovery_event(struct work_struct *work) 228 { 229 struct sas_discovery_event *ev = container_of(work, typeof(*ev), work.work); 230 231 return ev; 232 } 233 234 struct sas_discovery { 235 struct sas_discovery_event disc_work[DISC_NUM_EVENTS]; 236 unsigned long pending; 237 u8 fanout_sas_addr[SAS_ADDR_SIZE]; 238 u8 eeds_a[SAS_ADDR_SIZE]; 239 u8 eeds_b[SAS_ADDR_SIZE]; 240 int max_level; 241 }; 242 243 /* The port struct is Class:RW, driver:RO */ 244 struct asd_sas_port { 245 /* private: */ 246 struct sas_discovery disc; 247 struct domain_device *port_dev; 248 spinlock_t dev_list_lock; 249 struct list_head dev_list; 250 struct list_head disco_list; 251 struct list_head destroy_list; 252 struct list_head sas_port_del_list; 253 enum sas_linkrate linkrate; 254 255 struct sas_work work; 256 int suspended; 257 258 /* public: */ 259 int id; 260 261 enum sas_class class; 262 u8 sas_addr[SAS_ADDR_SIZE]; 263 u8 attached_sas_addr[SAS_ADDR_SIZE]; 264 enum sas_protocol iproto; 265 enum sas_protocol tproto; 266 267 enum sas_oob_mode oob_mode; 268 269 spinlock_t phy_list_lock; 270 struct list_head phy_list; 271 int num_phys; 272 u32 phy_mask; 273 274 struct sas_ha_struct *ha; 275 276 struct sas_port *port; 277 278 void *lldd_port; /* not touched by the sas class code */ 279 }; 280 281 struct asd_sas_event { 282 struct sas_work work; 283 struct asd_sas_phy *phy; 284 int event; 285 }; 286 287 static inline struct asd_sas_event *to_asd_sas_event(struct work_struct *work) 288 { 289 struct asd_sas_event *ev = container_of(work, typeof(*ev), work.work); 290 291 return ev; 292 } 293 294 static inline void INIT_SAS_EVENT(struct asd_sas_event *ev, 295 void (*fn)(struct work_struct *), 296 struct asd_sas_phy *phy, int event) 297 { 298 INIT_SAS_WORK(&ev->work, fn); 299 ev->phy = phy; 300 ev->event = event; 301 } 302 303 #define SAS_PHY_SHUTDOWN_THRES 1024 304 305 /* The phy pretty much is controlled by the LLDD. 306 * The class only reads those fields. 307 */ 308 struct asd_sas_phy { 309 /* private: */ 310 atomic_t event_nr; 311 int in_shutdown; 312 int error; 313 int suspended; 314 315 struct sas_phy *phy; 316 317 /* public: */ 318 /* The following are class:RO, driver:R/W */ 319 int enabled; /* must be set */ 320 321 int id; /* must be set */ 322 enum sas_class class; 323 enum sas_protocol iproto; 324 enum sas_protocol tproto; 325 326 enum sas_phy_type type; 327 enum sas_phy_role role; 328 enum sas_oob_mode oob_mode; 329 enum sas_linkrate linkrate; 330 331 u8 *sas_addr; /* must be set */ 332 u8 attached_sas_addr[SAS_ADDR_SIZE]; /* class:RO, driver: R/W */ 333 334 spinlock_t frame_rcvd_lock; 335 u8 *frame_rcvd; /* must be set */ 336 int frame_rcvd_size; 337 338 spinlock_t sas_prim_lock; 339 u32 sas_prim; 340 341 struct list_head port_phy_el; /* driver:RO */ 342 struct asd_sas_port *port; /* Class:RW, driver: RO */ 343 344 struct sas_ha_struct *ha; /* may be set; the class sets it anyway */ 345 346 void *lldd_phy; /* not touched by the sas_class_code */ 347 }; 348 349 struct scsi_core { 350 struct Scsi_Host *shost; 351 352 }; 353 354 enum sas_ha_state { 355 SAS_HA_REGISTERED, 356 SAS_HA_DRAINING, 357 SAS_HA_ATA_EH_ACTIVE, 358 SAS_HA_FROZEN, 359 }; 360 361 struct sas_ha_struct { 362 /* private: */ 363 struct list_head defer_q; /* work queued while draining */ 364 struct mutex drain_mutex; 365 unsigned long state; 366 spinlock_t lock; 367 int eh_active; 368 wait_queue_head_t eh_wait_q; 369 struct list_head eh_dev_q; 370 371 struct mutex disco_mutex; 372 373 struct scsi_core core; 374 375 /* public: */ 376 char *sas_ha_name; 377 struct device *dev; /* should be set */ 378 struct module *lldd_module; /* should be set */ 379 380 struct workqueue_struct *event_q; 381 struct workqueue_struct *disco_q; 382 383 u8 *sas_addr; /* must be set */ 384 u8 hashed_sas_addr[HASHED_SAS_ADDR_SIZE]; 385 386 spinlock_t phy_port_lock; 387 struct asd_sas_phy **sas_phy; /* array of valid pointers, must be set */ 388 struct asd_sas_port **sas_port; /* array of valid pointers, must be set */ 389 int num_phys; /* must be set, gt 0, static */ 390 391 int strict_wide_ports; /* both sas_addr and attached_sas_addr must match 392 * their siblings when forming wide ports */ 393 394 void *lldd_ha; /* not touched by sas class code */ 395 396 struct list_head eh_done_q; /* complete via scsi_eh_flush_done_q */ 397 struct list_head eh_ata_q; /* scmds to promote from sas to ata eh */ 398 399 int event_thres; 400 }; 401 402 #define SHOST_TO_SAS_HA(_shost) (*(struct sas_ha_struct **)(_shost)->hostdata) 403 404 static inline struct domain_device * 405 starget_to_domain_dev(struct scsi_target *starget) { 406 return starget->hostdata; 407 } 408 409 static inline struct domain_device * 410 sdev_to_domain_dev(struct scsi_device *sdev) { 411 return starget_to_domain_dev(sdev->sdev_target); 412 } 413 414 static inline struct ata_device *sas_to_ata_dev(struct domain_device *dev) 415 { 416 return &dev->sata_dev.ap->link.device[0]; 417 } 418 419 static inline struct domain_device * 420 cmd_to_domain_dev(struct scsi_cmnd *cmd) 421 { 422 return sdev_to_domain_dev(cmd->device); 423 } 424 425 void sas_hash_addr(u8 *hashed, const u8 *sas_addr); 426 427 /* Before calling a notify event, LLDD should use this function 428 * when the link is severed (possibly from its tasklet). 429 * The idea is that the Class only reads those, while the LLDD, 430 * can R/W these (thus avoiding a race). 431 */ 432 static inline void sas_phy_disconnected(struct asd_sas_phy *phy) 433 { 434 phy->oob_mode = OOB_NOT_CONNECTED; 435 phy->linkrate = SAS_LINK_RATE_UNKNOWN; 436 } 437 438 static inline unsigned int to_sas_gpio_od(int device, int bit) 439 { 440 return 3 * device + bit; 441 } 442 443 static inline void sas_put_local_phy(struct sas_phy *phy) 444 { 445 put_device(&phy->dev); 446 } 447 448 #ifdef CONFIG_SCSI_SAS_HOST_SMP 449 int try_test_sas_gpio_gp_bit(unsigned int od, u8 *data, u8 index, u8 count); 450 #else 451 static inline int try_test_sas_gpio_gp_bit(unsigned int od, u8 *data, u8 index, u8 count) 452 { 453 return -1; 454 } 455 #endif 456 457 /* ---------- Tasks ---------- */ 458 /* 459 service_response | SAS_TASK_COMPLETE | SAS_TASK_UNDELIVERED | 460 exec_status | | | 461 ---------------------+---------------------+-----------------------+ 462 SAM_... | X | | 463 DEV_NO_RESPONSE | X | X | 464 INTERRUPTED | X | | 465 QUEUE_FULL | | X | 466 DEVICE_UNKNOWN | | X | 467 SG_ERR | | X | 468 ---------------------+---------------------+-----------------------+ 469 */ 470 471 enum service_response { 472 SAS_TASK_COMPLETE, 473 SAS_TASK_UNDELIVERED = -1, 474 }; 475 476 enum exec_status { 477 /* The SAM_STAT_.. codes fit in the lower 6 bits, alias some of 478 * them here to silence 'case value not in enumerated type' warnings 479 */ 480 __SAM_STAT_CHECK_CONDITION = SAM_STAT_CHECK_CONDITION, 481 482 SAS_DEV_NO_RESPONSE = 0x80, 483 SAS_DATA_UNDERRUN, 484 SAS_DATA_OVERRUN, 485 SAS_INTERRUPTED, 486 SAS_QUEUE_FULL, 487 SAS_DEVICE_UNKNOWN, 488 SAS_SG_ERR, 489 SAS_OPEN_REJECT, 490 SAS_OPEN_TO, 491 SAS_PROTO_RESPONSE, 492 SAS_PHY_DOWN, 493 SAS_NAK_R_ERR, 494 SAS_PENDING, 495 SAS_ABORTED_TASK, 496 }; 497 498 /* When a task finishes with a response, the LLDD examines the 499 * response: 500 * - For an ATA task task_status_struct::stat is set to 501 * SAS_PROTO_RESPONSE, and the task_status_struct::buf is set to the 502 * contents of struct ata_task_resp. 503 * - For SSP tasks, if no data is present or status/TMF response 504 * is valid, task_status_struct::stat is set. If data is present 505 * (SENSE data), the LLDD copies up to SAS_STATUS_BUF_SIZE, sets 506 * task_status_struct::buf_valid_size, and task_status_struct::stat is 507 * set to SAM_CHECK_COND. 508 * 509 * "buf" has format SCSI Sense for SSP task, or struct ata_task_resp 510 * for ATA task. 511 * 512 * "frame_len" is the total frame length, which could be more or less 513 * than actually copied. 514 * 515 * Tasks ending with response, always set the residual field. 516 */ 517 struct ata_task_resp { 518 u16 frame_len; 519 u8 ending_fis[ATA_RESP_FIS_SIZE]; /* dev to host or data-in */ 520 }; 521 522 #define SAS_STATUS_BUF_SIZE 96 523 524 struct task_status_struct { 525 enum service_response resp; 526 enum exec_status stat; 527 int buf_valid_size; 528 529 u8 buf[SAS_STATUS_BUF_SIZE]; 530 531 u32 residual; 532 enum sas_open_rej_reason open_rej_reason; 533 }; 534 535 /* ATA and ATAPI task queuable to a SAS LLDD. 536 */ 537 struct sas_ata_task { 538 struct host_to_dev_fis fis; 539 u8 atapi_packet[16]; /* 0 if not ATAPI task */ 540 541 u8 retry_count; /* hardware retry, should be > 0 */ 542 543 u8 dma_xfer:1; /* PIO:0 or DMA:1 */ 544 u8 use_ncq:1; 545 u8 set_affil_pol:1; 546 u8 stp_affil_pol:1; 547 548 u8 device_control_reg_update:1; 549 }; 550 551 struct sas_smp_task { 552 struct scatterlist smp_req; 553 struct scatterlist smp_resp; 554 }; 555 556 enum task_attribute { 557 TASK_ATTR_SIMPLE = 0, 558 TASK_ATTR_HOQ = 1, 559 TASK_ATTR_ORDERED= 2, 560 TASK_ATTR_ACA = 4, 561 }; 562 563 struct sas_ssp_task { 564 u8 retry_count; /* hardware retry, should be > 0 */ 565 566 u8 LUN[8]; 567 u8 enable_first_burst:1; 568 enum task_attribute task_attr; 569 u8 task_prio; 570 struct scsi_cmnd *cmd; 571 }; 572 573 struct sas_task { 574 struct domain_device *dev; 575 576 spinlock_t task_state_lock; 577 unsigned task_state_flags; 578 579 enum sas_protocol task_proto; 580 581 union { 582 struct sas_ata_task ata_task; 583 struct sas_smp_task smp_task; 584 struct sas_ssp_task ssp_task; 585 }; 586 587 struct scatterlist *scatter; 588 int num_scatter; 589 u32 total_xfer_len; 590 u8 data_dir:2; /* Use PCI_DMA_... */ 591 592 struct task_status_struct task_status; 593 void (*task_done)(struct sas_task *); 594 595 void *lldd_task; /* for use by LLDDs */ 596 void *uldd_task; 597 struct sas_task_slow *slow_task; 598 }; 599 600 struct sas_task_slow { 601 /* standard/extra infrastructure for slow path commands (SMP and 602 * internal lldd commands 603 */ 604 struct timer_list timer; 605 struct completion completion; 606 struct sas_task *task; 607 }; 608 609 #define SAS_TASK_STATE_PENDING 1 610 #define SAS_TASK_STATE_DONE 2 611 #define SAS_TASK_STATE_ABORTED 4 612 #define SAS_TASK_NEED_DEV_RESET 8 613 #define SAS_TASK_AT_INITIATOR 16 614 615 extern struct sas_task *sas_alloc_task(gfp_t flags); 616 extern struct sas_task *sas_alloc_slow_task(gfp_t flags); 617 extern void sas_free_task(struct sas_task *task); 618 619 struct sas_domain_function_template { 620 /* The class calls these to notify the LLDD of an event. */ 621 void (*lldd_port_formed)(struct asd_sas_phy *); 622 void (*lldd_port_deformed)(struct asd_sas_phy *); 623 624 /* The class calls these when a device is found or gone. */ 625 int (*lldd_dev_found)(struct domain_device *); 626 void (*lldd_dev_gone)(struct domain_device *); 627 628 int (*lldd_execute_task)(struct sas_task *, gfp_t gfp_flags); 629 630 /* Task Management Functions. Must be called from process context. */ 631 int (*lldd_abort_task)(struct sas_task *); 632 int (*lldd_abort_task_set)(struct domain_device *, u8 *lun); 633 int (*lldd_clear_aca)(struct domain_device *, u8 *lun); 634 int (*lldd_clear_task_set)(struct domain_device *, u8 *lun); 635 int (*lldd_I_T_nexus_reset)(struct domain_device *); 636 int (*lldd_ata_check_ready)(struct domain_device *); 637 void (*lldd_ata_set_dmamode)(struct domain_device *); 638 int (*lldd_lu_reset)(struct domain_device *, u8 *lun); 639 int (*lldd_query_task)(struct sas_task *); 640 641 /* Port and Adapter management */ 642 int (*lldd_clear_nexus_port)(struct asd_sas_port *); 643 int (*lldd_clear_nexus_ha)(struct sas_ha_struct *); 644 645 /* Phy management */ 646 int (*lldd_control_phy)(struct asd_sas_phy *, enum phy_func, void *); 647 648 /* GPIO support */ 649 int (*lldd_write_gpio)(struct sas_ha_struct *, u8 reg_type, 650 u8 reg_index, u8 reg_count, u8 *write_data); 651 }; 652 653 extern int sas_register_ha(struct sas_ha_struct *); 654 extern int sas_unregister_ha(struct sas_ha_struct *); 655 extern void sas_prep_resume_ha(struct sas_ha_struct *sas_ha); 656 extern void sas_resume_ha(struct sas_ha_struct *sas_ha); 657 extern void sas_suspend_ha(struct sas_ha_struct *sas_ha); 658 659 int sas_set_phy_speed(struct sas_phy *phy, struct sas_phy_linkrates *rates); 660 int sas_phy_reset(struct sas_phy *phy, int hard_reset); 661 extern int sas_queuecommand(struct Scsi_Host *, struct scsi_cmnd *); 662 extern int sas_target_alloc(struct scsi_target *); 663 extern int sas_slave_configure(struct scsi_device *); 664 extern int sas_change_queue_depth(struct scsi_device *, int new_depth); 665 extern int sas_bios_param(struct scsi_device *, struct block_device *, 666 sector_t capacity, int *hsc); 667 extern struct scsi_transport_template * 668 sas_domain_attach_transport(struct sas_domain_function_template *); 669 extern struct device_attribute dev_attr_phy_event_threshold; 670 671 int sas_discover_root_expander(struct domain_device *); 672 673 void sas_init_ex_attr(void); 674 675 int sas_ex_revalidate_domain(struct domain_device *); 676 677 void sas_unregister_domain_devices(struct asd_sas_port *port, int gone); 678 void sas_init_disc(struct sas_discovery *disc, struct asd_sas_port *); 679 int sas_discover_event(struct asd_sas_port *, enum discover_event ev); 680 681 int sas_discover_sata(struct domain_device *); 682 int sas_discover_end_dev(struct domain_device *); 683 684 void sas_unregister_dev(struct asd_sas_port *port, struct domain_device *); 685 686 void sas_init_dev(struct domain_device *); 687 688 void sas_task_abort(struct sas_task *); 689 int sas_eh_abort_handler(struct scsi_cmnd *cmd); 690 int sas_eh_device_reset_handler(struct scsi_cmnd *cmd); 691 int sas_eh_target_reset_handler(struct scsi_cmnd *cmd); 692 693 extern void sas_target_destroy(struct scsi_target *); 694 extern int sas_slave_alloc(struct scsi_device *); 695 extern int sas_ioctl(struct scsi_device *sdev, unsigned int cmd, 696 void __user *arg); 697 extern int sas_drain_work(struct sas_ha_struct *ha); 698 699 extern void sas_ssp_task_response(struct device *dev, struct sas_task *task, 700 struct ssp_response_iu *iu); 701 struct sas_phy *sas_get_local_phy(struct domain_device *dev); 702 703 int sas_request_addr(struct Scsi_Host *shost, u8 *addr); 704 705 int sas_notify_port_event(struct asd_sas_phy *phy, enum port_event event, 706 gfp_t gfp_flags); 707 int sas_notify_phy_event(struct asd_sas_phy *phy, enum phy_event event, 708 gfp_t gfp_flags); 709 710 #endif /* _SASLIB_H_ */ 711