1#ifndef _SCSI_SCSI_HOST_H 2#define _SCSI_SCSI_HOST_H 3 4#include <linux/device.h> 5#include <linux/list.h> 6#include <linux/types.h> 7#include <linux/workqueue.h> 8#include <linux/mutex.h> 9#include <scsi/scsi.h> 10 11struct request_queue; 12struct block_device; 13struct completion; 14struct module; 15struct scsi_cmnd; 16struct scsi_device; 17struct scsi_target; 18struct Scsi_Host; 19struct scsi_host_cmd_pool; 20struct scsi_transport_template; 21struct blk_queue_tags; 22 23 24/* 25 * The various choices mean: 26 * NONE: Self evident. Host adapter is not capable of scatter-gather. 27 * ALL: Means that the host adapter module can do scatter-gather, 28 * and that there is no limit to the size of the table to which 29 * we scatter/gather data. The value we set here is the maximum 30 * single element sglist. To use chained sglists, the adapter 31 * has to set a value beyond ALL (and correctly use the chain 32 * handling API. 33 * Anything else: Indicates the maximum number of chains that can be 34 * used in one scatter-gather request. 35 */ 36#define SG_NONE 0 37#define SG_ALL SCSI_MAX_SG_SEGMENTS 38 39#define MODE_UNKNOWN 0x00 40#define MODE_INITIATOR 0x01 41#define MODE_TARGET 0x02 42 43#define DISABLE_CLUSTERING 0 44#define ENABLE_CLUSTERING 1 45 46enum { 47 SCSI_QDEPTH_DEFAULT, /* default requested change, e.g. from sysfs */ 48 SCSI_QDEPTH_QFULL, /* scsi-ml requested due to queue full */ 49 SCSI_QDEPTH_RAMP_UP, /* scsi-ml requested due to threshold event */ 50}; 51 52struct scsi_host_template { 53 struct module *module; 54 const char *name; 55 56 /* 57 * Used to initialize old-style drivers. For new-style drivers 58 * just perform all work in your module initialization function. 59 * 60 * Status: OBSOLETE 61 */ 62 int (* detect)(struct scsi_host_template *); 63 64 /* 65 * Used as unload callback for hosts with old-style drivers. 66 * 67 * Status: OBSOLETE 68 */ 69 int (* release)(struct Scsi_Host *); 70 71 /* 72 * The info function will return whatever useful information the 73 * developer sees fit. If not provided, then the name field will 74 * be used instead. 75 * 76 * Status: OPTIONAL 77 */ 78 const char *(* info)(struct Scsi_Host *); 79 80 /* 81 * Ioctl interface 82 * 83 * Status: OPTIONAL 84 */ 85 int (* ioctl)(struct scsi_device *dev, int cmd, void __user *arg); 86 87 88#ifdef CONFIG_COMPAT 89 /* 90 * Compat handler. Handle 32bit ABI. 91 * When unknown ioctl is passed return -ENOIOCTLCMD. 92 * 93 * Status: OPTIONAL 94 */ 95 int (* compat_ioctl)(struct scsi_device *dev, int cmd, void __user *arg); 96#endif 97 98 /* 99 * The queuecommand function is used to queue up a scsi 100 * command block to the LLDD. When the driver finished 101 * processing the command the done callback is invoked. 102 * 103 * If queuecommand returns 0, then the HBA has accepted the 104 * command. The done() function must be called on the command 105 * when the driver has finished with it. (you may call done on the 106 * command before queuecommand returns, but in this case you 107 * *must* return 0 from queuecommand). 108 * 109 * Queuecommand may also reject the command, in which case it may 110 * not touch the command and must not call done() for it. 111 * 112 * There are two possible rejection returns: 113 * 114 * SCSI_MLQUEUE_DEVICE_BUSY: Block this device temporarily, but 115 * allow commands to other devices serviced by this host. 116 * 117 * SCSI_MLQUEUE_HOST_BUSY: Block all devices served by this 118 * host temporarily. 119 * 120 * For compatibility, any other non-zero return is treated the 121 * same as SCSI_MLQUEUE_HOST_BUSY. 122 * 123 * NOTE: "temporarily" means either until the next command for# 124 * this device/host completes, or a period of time determined by 125 * I/O pressure in the system if there are no other outstanding 126 * commands. 127 * 128 * STATUS: REQUIRED 129 */ 130 int (* queuecommand)(struct Scsi_Host *, struct scsi_cmnd *); 131 132 /* 133 * The transfer functions are used to queue a scsi command to 134 * the LLD. When the driver is finished processing the command 135 * the done callback is invoked. 136 * 137 * This is called to inform the LLD to transfer 138 * scsi_bufflen(cmd) bytes. scsi_sg_count(cmd) speciefies the 139 * number of scatterlist entried in the command and 140 * scsi_sglist(cmd) returns the scatterlist. 141 * 142 * return values: see queuecommand 143 * 144 * If the LLD accepts the cmd, it should set the result to an 145 * appropriate value when completed before calling the done function. 146 * 147 * STATUS: REQUIRED FOR TARGET DRIVERS 148 */ 149 /* TODO: rename */ 150 int (* transfer_response)(struct scsi_cmnd *, 151 void (*done)(struct scsi_cmnd *)); 152 153 /* 154 * This is an error handling strategy routine. You don't need to 155 * define one of these if you don't want to - there is a default 156 * routine that is present that should work in most cases. For those 157 * driver authors that have the inclination and ability to write their 158 * own strategy routine, this is where it is specified. Note - the 159 * strategy routine is *ALWAYS* run in the context of the kernel eh 160 * thread. Thus you are guaranteed to *NOT* be in an interrupt 161 * handler when you execute this, and you are also guaranteed to 162 * *NOT* have any other commands being queued while you are in the 163 * strategy routine. When you return from this function, operations 164 * return to normal. 165 * 166 * See scsi_error.c scsi_unjam_host for additional comments about 167 * what this function should and should not be attempting to do. 168 * 169 * Status: REQUIRED (at least one of them) 170 */ 171 int (* eh_abort_handler)(struct scsi_cmnd *); 172 int (* eh_device_reset_handler)(struct scsi_cmnd *); 173 int (* eh_target_reset_handler)(struct scsi_cmnd *); 174 int (* eh_bus_reset_handler)(struct scsi_cmnd *); 175 int (* eh_host_reset_handler)(struct scsi_cmnd *); 176 177 /* 178 * Before the mid layer attempts to scan for a new device where none 179 * currently exists, it will call this entry in your driver. Should 180 * your driver need to allocate any structs or perform any other init 181 * items in order to send commands to a currently unused target/lun 182 * combo, then this is where you can perform those allocations. This 183 * is specifically so that drivers won't have to perform any kind of 184 * "is this a new device" checks in their queuecommand routine, 185 * thereby making the hot path a bit quicker. 186 * 187 * Return values: 0 on success, non-0 on failure 188 * 189 * Deallocation: If we didn't find any devices at this ID, you will 190 * get an immediate call to slave_destroy(). If we find something 191 * here then you will get a call to slave_configure(), then the 192 * device will be used for however long it is kept around, then when 193 * the device is removed from the system (or * possibly at reboot 194 * time), you will then get a call to slave_destroy(). This is 195 * assuming you implement slave_configure and slave_destroy. 196 * However, if you allocate memory and hang it off the device struct, 197 * then you must implement the slave_destroy() routine at a minimum 198 * in order to avoid leaking memory 199 * each time a device is tore down. 200 * 201 * Status: OPTIONAL 202 */ 203 int (* slave_alloc)(struct scsi_device *); 204 205 /* 206 * Once the device has responded to an INQUIRY and we know the 207 * device is online, we call into the low level driver with the 208 * struct scsi_device *. If the low level device driver implements 209 * this function, it *must* perform the task of setting the queue 210 * depth on the device. All other tasks are optional and depend 211 * on what the driver supports and various implementation details. 212 * 213 * Things currently recommended to be handled at this time include: 214 * 215 * 1. Setting the device queue depth. Proper setting of this is 216 * described in the comments for scsi_adjust_queue_depth. 217 * 2. Determining if the device supports the various synchronous 218 * negotiation protocols. The device struct will already have 219 * responded to INQUIRY and the results of the standard items 220 * will have been shoved into the various device flag bits, eg. 221 * device->sdtr will be true if the device supports SDTR messages. 222 * 3. Allocating command structs that the device will need. 223 * 4. Setting the default timeout on this device (if needed). 224 * 5. Anything else the low level driver might want to do on a device 225 * specific setup basis... 226 * 6. Return 0 on success, non-0 on error. The device will be marked 227 * as offline on error so that no access will occur. If you return 228 * non-0, your slave_destroy routine will never get called for this 229 * device, so don't leave any loose memory hanging around, clean 230 * up after yourself before returning non-0 231 * 232 * Status: OPTIONAL 233 */ 234 int (* slave_configure)(struct scsi_device *); 235 236 /* 237 * Immediately prior to deallocating the device and after all activity 238 * has ceased the mid layer calls this point so that the low level 239 * driver may completely detach itself from the scsi device and vice 240 * versa. The low level driver is responsible for freeing any memory 241 * it allocated in the slave_alloc or slave_configure calls. 242 * 243 * Status: OPTIONAL 244 */ 245 void (* slave_destroy)(struct scsi_device *); 246 247 /* 248 * Before the mid layer attempts to scan for a new device attached 249 * to a target where no target currently exists, it will call this 250 * entry in your driver. Should your driver need to allocate any 251 * structs or perform any other init items in order to send commands 252 * to a currently unused target, then this is where you can perform 253 * those allocations. 254 * 255 * Return values: 0 on success, non-0 on failure 256 * 257 * Status: OPTIONAL 258 */ 259 int (* target_alloc)(struct scsi_target *); 260 261 /* 262 * Immediately prior to deallocating the target structure, and 263 * after all activity to attached scsi devices has ceased, the 264 * midlayer calls this point so that the driver may deallocate 265 * and terminate any references to the target. 266 * 267 * Status: OPTIONAL 268 */ 269 void (* target_destroy)(struct scsi_target *); 270 271 /* 272 * If a host has the ability to discover targets on its own instead 273 * of scanning the entire bus, it can fill in this function and 274 * call scsi_scan_host(). This function will be called periodically 275 * until it returns 1 with the scsi_host and the elapsed time of 276 * the scan in jiffies. 277 * 278 * Status: OPTIONAL 279 */ 280 int (* scan_finished)(struct Scsi_Host *, unsigned long); 281 282 /* 283 * If the host wants to be called before the scan starts, but 284 * after the midlayer has set up ready for the scan, it can fill 285 * in this function. 286 * 287 * Status: OPTIONAL 288 */ 289 void (* scan_start)(struct Scsi_Host *); 290 291 /* 292 * Fill in this function to allow the queue depth of this host 293 * to be changeable (on a per device basis). Returns either 294 * the current queue depth setting (may be different from what 295 * was passed in) or an error. An error should only be 296 * returned if the requested depth is legal but the driver was 297 * unable to set it. If the requested depth is illegal, the 298 * driver should set and return the closest legal queue depth. 299 * 300 * Status: OPTIONAL 301 */ 302 int (* change_queue_depth)(struct scsi_device *, int, int); 303 304 /* 305 * Fill in this function to allow the changing of tag types 306 * (this also allows the enabling/disabling of tag command 307 * queueing). An error should only be returned if something 308 * went wrong in the driver while trying to set the tag type. 309 * If the driver doesn't support the requested tag type, then 310 * it should set the closest type it does support without 311 * returning an error. Returns the actual tag type set. 312 * 313 * Status: OPTIONAL 314 */ 315 int (* change_queue_type)(struct scsi_device *, int); 316 317 /* 318 * This function determines the BIOS parameters for a given 319 * harddisk. These tend to be numbers that are made up by 320 * the host adapter. Parameters: 321 * size, device, list (heads, sectors, cylinders) 322 * 323 * Status: OPTIONAL 324 */ 325 int (* bios_param)(struct scsi_device *, struct block_device *, 326 sector_t, int []); 327 328 /* 329 * This function is called when one or more partitions on the 330 * device reach beyond the end of the device. 331 * 332 * Status: OPTIONAL 333 */ 334 void (*unlock_native_capacity)(struct scsi_device *); 335 336 /* 337 * Can be used to export driver statistics and other infos to the 338 * world outside the kernel ie. userspace and it also provides an 339 * interface to feed the driver with information. 340 * 341 * Status: OBSOLETE 342 */ 343 int (*proc_info)(struct Scsi_Host *, char *, char **, off_t, int, int); 344 345 /* 346 * This is an optional routine that allows the transport to become 347 * involved when a scsi io timer fires. The return value tells the 348 * timer routine how to finish the io timeout handling: 349 * EH_HANDLED: I fixed the error, please complete the command 350 * EH_RESET_TIMER: I need more time, reset the timer and 351 * begin counting again 352 * EH_NOT_HANDLED Begin normal error recovery 353 * 354 * Status: OPTIONAL 355 */ 356 enum blk_eh_timer_return (*eh_timed_out)(struct scsi_cmnd *); 357 358 /* This is an optional routine that allows transport to initiate 359 * LLD adapter or firmware reset using sysfs attribute. 360 * 361 * Return values: 0 on success, -ve value on failure. 362 * 363 * Status: OPTIONAL 364 */ 365 366 int (*host_reset)(struct Scsi_Host *shost, int reset_type); 367#define SCSI_ADAPTER_RESET 1 368#define SCSI_FIRMWARE_RESET 2 369 370 371 /* 372 * Name of proc directory 373 */ 374 const char *proc_name; 375 376 /* 377 * Used to store the procfs directory if a driver implements the 378 * proc_info method. 379 */ 380 struct proc_dir_entry *proc_dir; 381 382 /* 383 * This determines if we will use a non-interrupt driven 384 * or an interrupt driven scheme. It is set to the maximum number 385 * of simultaneous commands a given host adapter will accept. 386 */ 387 int can_queue; 388 389 /* 390 * In many instances, especially where disconnect / reconnect are 391 * supported, our host also has an ID on the SCSI bus. If this is 392 * the case, then it must be reserved. Please set this_id to -1 if 393 * your setup is in single initiator mode, and the host lacks an 394 * ID. 395 */ 396 int this_id; 397 398 /* 399 * This determines the degree to which the host adapter is capable 400 * of scatter-gather. 401 */ 402 unsigned short sg_tablesize; 403 unsigned short sg_prot_tablesize; 404 405 /* 406 * Set this if the host adapter has limitations beside segment count. 407 */ 408 unsigned short max_sectors; 409 410 /* 411 * DMA scatter gather segment boundary limit. A segment crossing this 412 * boundary will be split in two. 413 */ 414 unsigned long dma_boundary; 415 416 /* 417 * This specifies "machine infinity" for host templates which don't 418 * limit the transfer size. Note this limit represents an absolute 419 * maximum, and may be over the transfer limits allowed for 420 * individual devices (e.g. 256 for SCSI-1). 421 */ 422#define SCSI_DEFAULT_MAX_SECTORS 1024 423 424 /* 425 * True if this host adapter can make good use of linked commands. 426 * This will allow more than one command to be queued to a given 427 * unit on a given host. Set this to the maximum number of command 428 * blocks to be provided for each device. Set this to 1 for one 429 * command block per lun, 2 for two, etc. Do not set this to 0. 430 * You should make sure that the host adapter will do the right thing 431 * before you try setting this above 1. 432 */ 433 short cmd_per_lun; 434 435 /* 436 * present contains counter indicating how many boards of this 437 * type were found when we did the scan. 438 */ 439 unsigned char present; 440 441 /* 442 * This specifies the mode that a LLD supports. 443 */ 444 unsigned supported_mode:2; 445 446 /* 447 * True if this host adapter uses unchecked DMA onto an ISA bus. 448 */ 449 unsigned unchecked_isa_dma:1; 450 451 /* 452 * True if this host adapter can make good use of clustering. 453 * I originally thought that if the tablesize was large that it 454 * was a waste of CPU cycles to prepare a cluster list, but 455 * it works out that the Buslogic is faster if you use a smaller 456 * number of segments (i.e. use clustering). I guess it is 457 * inefficient. 458 */ 459 unsigned use_clustering:1; 460 461 /* 462 * True for emulated SCSI host adapters (e.g. ATAPI). 463 */ 464 unsigned emulated:1; 465 466 /* 467 * True if the low-level driver performs its own reset-settle delays. 468 */ 469 unsigned skip_settle_delay:1; 470 471 /* 472 * True if we are using ordered write support. 473 */ 474 unsigned ordered_tag:1; 475 476 /* 477 * Countdown for host blocking with no commands outstanding. 478 */ 479 unsigned int max_host_blocked; 480 481 /* 482 * Default value for the blocking. If the queue is empty, 483 * host_blocked counts down in the request_fn until it restarts 484 * host operations as zero is reached. 485 * 486 * FIXME: This should probably be a value in the template 487 */ 488#define SCSI_DEFAULT_HOST_BLOCKED 7 489 490 /* 491 * Pointer to the sysfs class properties for this host, NULL terminated. 492 */ 493 struct device_attribute **shost_attrs; 494 495 /* 496 * Pointer to the SCSI device properties for this host, NULL terminated. 497 */ 498 struct device_attribute **sdev_attrs; 499 500 /* 501 * List of hosts per template. 502 * 503 * This is only for use by scsi_module.c for legacy templates. 504 * For these access to it is synchronized implicitly by 505 * module_init/module_exit. 506 */ 507 struct list_head legacy_hosts; 508 509 /* 510 * Vendor Identifier associated with the host 511 * 512 * Note: When specifying vendor_id, be sure to read the 513 * Vendor Type and ID formatting requirements specified in 514 * scsi_netlink.h 515 */ 516 u64 vendor_id; 517}; 518 519/* 520 * Temporary #define for host lock push down. Can be removed when all 521 * drivers have been updated to take advantage of unlocked 522 * queuecommand. 523 * 524 */ 525#define DEF_SCSI_QCMD(func_name) \ 526 int func_name(struct Scsi_Host *shost, struct scsi_cmnd *cmd) \ 527 { \ 528 unsigned long irq_flags; \ 529 int rc; \ 530 spin_lock_irqsave(shost->host_lock, irq_flags); \ 531 scsi_cmd_get_serial(shost, cmd); \ 532 rc = func_name##_lck (cmd, cmd->scsi_done); \ 533 spin_unlock_irqrestore(shost->host_lock, irq_flags); \ 534 return rc; \ 535 } 536 537 538/* 539 * shost state: If you alter this, you also need to alter scsi_sysfs.c 540 * (for the ascii descriptions) and the state model enforcer: 541 * scsi_host_set_state() 542 */ 543enum scsi_host_state { 544 SHOST_CREATED = 1, 545 SHOST_RUNNING, 546 SHOST_CANCEL, 547 SHOST_DEL, 548 SHOST_RECOVERY, 549 SHOST_CANCEL_RECOVERY, 550 SHOST_DEL_RECOVERY, 551}; 552 553struct Scsi_Host { 554 /* 555 * __devices is protected by the host_lock, but you should 556 * usually use scsi_device_lookup / shost_for_each_device 557 * to access it and don't care about locking yourself. 558 * In the rare case of beeing in irq context you can use 559 * their __ prefixed variants with the lock held. NEVER 560 * access this list directly from a driver. 561 */ 562 struct list_head __devices; 563 struct list_head __targets; 564 565 struct scsi_host_cmd_pool *cmd_pool; 566 spinlock_t free_list_lock; 567 struct list_head free_list; /* backup store of cmd structs */ 568 struct list_head starved_list; 569 570 spinlock_t default_lock; 571 spinlock_t *host_lock; 572 573 struct mutex scan_mutex;/* serialize scanning activity */ 574 575 struct list_head eh_cmd_q; 576 struct task_struct * ehandler; /* Error recovery thread. */ 577 struct completion * eh_action; /* Wait for specific actions on the 578 host. */ 579 wait_queue_head_t host_wait; 580 struct scsi_host_template *hostt; 581 struct scsi_transport_template *transportt; 582 583 /* 584 * Area to keep a shared tag map (if needed, will be 585 * NULL if not). 586 */ 587 struct blk_queue_tag *bqt; 588 589 /* 590 * The following two fields are protected with host_lock; 591 * however, eh routines can safely access during eh processing 592 * without acquiring the lock. 593 */ 594 unsigned int host_busy; /* commands actually active on low-level */ 595 unsigned int host_failed; /* commands that failed. */ 596 unsigned int host_eh_scheduled; /* EH scheduled without command */ 597 598 unsigned int host_no; /* Used for IOCTL_GET_IDLUN, /proc/scsi et al. */ 599 int resetting; /* if set, it means that last_reset is a valid value */ 600 unsigned long last_reset; 601 602 /* 603 * These three parameters can be used to allow for wide scsi, 604 * and for host adapters that support multiple busses 605 * The first two should be set to 1 more than the actual max id 606 * or lun (i.e. 8 for normal systems). 607 */ 608 unsigned int max_id; 609 unsigned int max_lun; 610 unsigned int max_channel; 611 612 /* 613 * This is a unique identifier that must be assigned so that we 614 * have some way of identifying each detected host adapter properly 615 * and uniquely. For hosts that do not support more than one card 616 * in the system at one time, this does not need to be set. It is 617 * initialized to 0 in scsi_register. 618 */ 619 unsigned int unique_id; 620 621 /* 622 * The maximum length of SCSI commands that this host can accept. 623 * Probably 12 for most host adapters, but could be 16 for others. 624 * or 260 if the driver supports variable length cdbs. 625 * For drivers that don't set this field, a value of 12 is 626 * assumed. 627 */ 628 unsigned short max_cmd_len; 629 630 int this_id; 631 int can_queue; 632 short cmd_per_lun; 633 short unsigned int sg_tablesize; 634 short unsigned int sg_prot_tablesize; 635 short unsigned int max_sectors; 636 unsigned long dma_boundary; 637 /* 638 * Used to assign serial numbers to the cmds. 639 * Protected by the host lock. 640 */ 641 unsigned long cmd_serial_number; 642 643 unsigned active_mode:2; 644 unsigned unchecked_isa_dma:1; 645 unsigned use_clustering:1; 646 unsigned use_blk_tcq:1; 647 648 /* 649 * Host has requested that no further requests come through for the 650 * time being. 651 */ 652 unsigned host_self_blocked:1; 653 654 /* 655 * Host uses correct SCSI ordering not PC ordering. The bit is 656 * set for the minority of drivers whose authors actually read 657 * the spec ;). 658 */ 659 unsigned reverse_ordering:1; 660 661 /* 662 * Ordered write support 663 */ 664 unsigned ordered_tag:1; 665 666 /* Task mgmt function in progress */ 667 unsigned tmf_in_progress:1; 668 669 /* Asynchronous scan in progress */ 670 unsigned async_scan:1; 671 672 /* Don't resume host in EH */ 673 unsigned eh_noresume:1; 674 675 /* 676 * Optional work queue to be utilized by the transport 677 */ 678 char work_q_name[20]; 679 struct workqueue_struct *work_q; 680 681 /* 682 * Host has rejected a command because it was busy. 683 */ 684 unsigned int host_blocked; 685 686 /* 687 * Value host_blocked counts down from 688 */ 689 unsigned int max_host_blocked; 690 691 /* Protection Information */ 692 unsigned int prot_capabilities; 693 unsigned char prot_guard_type; 694 695 /* 696 * q used for scsi_tgt msgs, async events or any other requests that 697 * need to be processed in userspace 698 */ 699 struct request_queue *uspace_req_q; 700 701 /* legacy crap */ 702 unsigned long base; 703 unsigned long io_port; 704 unsigned char n_io_port; 705 unsigned char dma_channel; 706 unsigned int irq; 707 708 709 enum scsi_host_state shost_state; 710 711 /* ldm bits */ 712 struct device shost_gendev, shost_dev; 713 714 /* 715 * List of hosts per template. 716 * 717 * This is only for use by scsi_module.c for legacy templates. 718 * For these access to it is synchronized implicitly by 719 * module_init/module_exit. 720 */ 721 struct list_head sht_legacy_list; 722 723 /* 724 * Points to the transport data (if any) which is allocated 725 * separately 726 */ 727 void *shost_data; 728 729 /* 730 * Points to the physical bus device we'd use to do DMA 731 * Needed just in case we have virtual hosts. 732 */ 733 struct device *dma_dev; 734 735 /* 736 * We should ensure that this is aligned, both for better performance 737 * and also because some compilers (m68k) don't automatically force 738 * alignment to a long boundary. 739 */ 740 unsigned long hostdata[0] /* Used for storage of host specific stuff */ 741 __attribute__ ((aligned (sizeof(unsigned long)))); 742}; 743 744#define class_to_shost(d) \ 745 container_of(d, struct Scsi_Host, shost_dev) 746 747#define shost_printk(prefix, shost, fmt, a...) \ 748 dev_printk(prefix, &(shost)->shost_gendev, fmt, ##a) 749 750static inline void *shost_priv(struct Scsi_Host *shost) 751{ 752 return (void *)shost->hostdata; 753} 754 755int scsi_is_host_device(const struct device *); 756 757static inline struct Scsi_Host *dev_to_shost(struct device *dev) 758{ 759 while (!scsi_is_host_device(dev)) { 760 if (!dev->parent) 761 return NULL; 762 dev = dev->parent; 763 } 764 return container_of(dev, struct Scsi_Host, shost_gendev); 765} 766 767static inline int scsi_host_in_recovery(struct Scsi_Host *shost) 768{ 769 return shost->shost_state == SHOST_RECOVERY || 770 shost->shost_state == SHOST_CANCEL_RECOVERY || 771 shost->shost_state == SHOST_DEL_RECOVERY || 772 shost->tmf_in_progress; 773} 774 775extern int scsi_queue_work(struct Scsi_Host *, struct work_struct *); 776extern void scsi_flush_work(struct Scsi_Host *); 777 778extern struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *, int); 779extern int __must_check scsi_add_host_with_dma(struct Scsi_Host *, 780 struct device *, 781 struct device *); 782extern void scsi_scan_host(struct Scsi_Host *); 783extern void scsi_rescan_device(struct device *); 784extern void scsi_remove_host(struct Scsi_Host *); 785extern struct Scsi_Host *scsi_host_get(struct Scsi_Host *); 786extern void scsi_host_put(struct Scsi_Host *t); 787extern struct Scsi_Host *scsi_host_lookup(unsigned short); 788extern const char *scsi_host_state_name(enum scsi_host_state); 789extern void scsi_cmd_get_serial(struct Scsi_Host *, struct scsi_cmnd *); 790 791extern u64 scsi_calculate_bounce_limit(struct Scsi_Host *); 792 793static inline int __must_check scsi_add_host(struct Scsi_Host *host, 794 struct device *dev) 795{ 796 return scsi_add_host_with_dma(host, dev, dev); 797} 798 799static inline struct device *scsi_get_device(struct Scsi_Host *shost) 800{ 801 return shost->shost_gendev.parent; 802} 803 804/** 805 * scsi_host_scan_allowed - Is scanning of this host allowed 806 * @shost: Pointer to Scsi_Host. 807 **/ 808static inline int scsi_host_scan_allowed(struct Scsi_Host *shost) 809{ 810 return shost->shost_state == SHOST_RUNNING || 811 shost->shost_state == SHOST_RECOVERY; 812} 813 814extern void scsi_unblock_requests(struct Scsi_Host *); 815extern void scsi_block_requests(struct Scsi_Host *); 816 817struct class_container; 818 819extern struct request_queue *__scsi_alloc_queue(struct Scsi_Host *shost, 820 void (*) (struct request_queue *)); 821/* 822 * These two functions are used to allocate and free a pseudo device 823 * which will connect to the host adapter itself rather than any 824 * physical device. You must deallocate when you are done with the 825 * thing. This physical pseudo-device isn't real and won't be available 826 * from any high-level drivers. 827 */ 828extern void scsi_free_host_dev(struct scsi_device *); 829extern struct scsi_device *scsi_get_host_dev(struct Scsi_Host *); 830 831/* 832 * DIF defines the exchange of protection information between 833 * initiator and SBC block device. 834 * 835 * DIX defines the exchange of protection information between OS and 836 * initiator. 837 */ 838enum scsi_host_prot_capabilities { 839 SHOST_DIF_TYPE1_PROTECTION = 1 << 0, /* T10 DIF Type 1 */ 840 SHOST_DIF_TYPE2_PROTECTION = 1 << 1, /* T10 DIF Type 2 */ 841 SHOST_DIF_TYPE3_PROTECTION = 1 << 2, /* T10 DIF Type 3 */ 842 843 SHOST_DIX_TYPE0_PROTECTION = 1 << 3, /* DIX between OS and HBA only */ 844 SHOST_DIX_TYPE1_PROTECTION = 1 << 4, /* DIX with DIF Type 1 */ 845 SHOST_DIX_TYPE2_PROTECTION = 1 << 5, /* DIX with DIF Type 2 */ 846 SHOST_DIX_TYPE3_PROTECTION = 1 << 6, /* DIX with DIF Type 3 */ 847}; 848 849/* 850 * SCSI hosts which support the Data Integrity Extensions must 851 * indicate their capabilities by setting the prot_capabilities using 852 * this call. 853 */ 854static inline void scsi_host_set_prot(struct Scsi_Host *shost, unsigned int mask) 855{ 856 shost->prot_capabilities = mask; 857} 858 859static inline unsigned int scsi_host_get_prot(struct Scsi_Host *shost) 860{ 861 return shost->prot_capabilities; 862} 863 864static inline int scsi_host_prot_dma(struct Scsi_Host *shost) 865{ 866 return shost->prot_capabilities >= SHOST_DIX_TYPE0_PROTECTION; 867} 868 869static inline unsigned int scsi_host_dif_capable(struct Scsi_Host *shost, unsigned int target_type) 870{ 871 static unsigned char cap[] = { 0, 872 SHOST_DIF_TYPE1_PROTECTION, 873 SHOST_DIF_TYPE2_PROTECTION, 874 SHOST_DIF_TYPE3_PROTECTION }; 875 876 return shost->prot_capabilities & cap[target_type] ? target_type : 0; 877} 878 879static inline unsigned int scsi_host_dix_capable(struct Scsi_Host *shost, unsigned int target_type) 880{ 881#if defined(CONFIG_BLK_DEV_INTEGRITY) 882 static unsigned char cap[] = { SHOST_DIX_TYPE0_PROTECTION, 883 SHOST_DIX_TYPE1_PROTECTION, 884 SHOST_DIX_TYPE2_PROTECTION, 885 SHOST_DIX_TYPE3_PROTECTION }; 886 887 return shost->prot_capabilities & cap[target_type]; 888#endif 889 return 0; 890} 891 892/* 893 * All DIX-capable initiators must support the T10-mandated CRC 894 * checksum. Controllers can optionally implement the IP checksum 895 * scheme which has much lower impact on system performance. Note 896 * that the main rationale for the checksum is to match integrity 897 * metadata with data. Detecting bit errors are a job for ECC memory 898 * and buses. 899 */ 900 901enum scsi_host_guard_type { 902 SHOST_DIX_GUARD_CRC = 1 << 0, 903 SHOST_DIX_GUARD_IP = 1 << 1, 904}; 905 906static inline void scsi_host_set_guard(struct Scsi_Host *shost, unsigned char type) 907{ 908 shost->prot_guard_type = type; 909} 910 911static inline unsigned char scsi_host_get_guard(struct Scsi_Host *shost) 912{ 913 return shost->prot_guard_type; 914} 915 916/* legacy interfaces */ 917extern struct Scsi_Host *scsi_register(struct scsi_host_template *, int); 918extern void scsi_unregister(struct Scsi_Host *); 919extern int scsi_host_set_state(struct Scsi_Host *, enum scsi_host_state); 920 921#endif /* _SCSI_SCSI_HOST_H */ 922