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1 : : /* SPDX-License-Identifier: GPL-2.0 */
2 : : #ifndef _SCSI_SCSI_HOST_H
3 : : #define _SCSI_SCSI_HOST_H
4 : :
5 : : #include <linux/device.h>
6 : : #include <linux/list.h>
7 : : #include <linux/types.h>
8 : : #include <linux/workqueue.h>
9 : : #include <linux/mutex.h>
10 : : #include <linux/seq_file.h>
11 : : #include <linux/blk-mq.h>
12 : : #include <scsi/scsi.h>
13 : :
14 : : struct block_device;
15 : : struct completion;
16 : : struct module;
17 : : struct scsi_cmnd;
18 : : struct scsi_device;
19 : : struct scsi_host_cmd_pool;
20 : : struct scsi_target;
21 : : struct Scsi_Host;
22 : : struct scsi_host_cmd_pool;
23 : : struct scsi_transport_template;
24 : :
25 : :
26 : : #define SG_ALL SG_CHUNK_SIZE
27 : :
28 : : #define MODE_UNKNOWN 0x00
29 : : #define MODE_INITIATOR 0x01
30 : : #define MODE_TARGET 0x02
31 : :
32 : : struct scsi_host_template {
33 : : struct module *module;
34 : : const char *name;
35 : :
36 : : /*
37 : : * The info function will return whatever useful information the
38 : : * developer sees fit. If not provided, then the name field will
39 : : * be used instead.
40 : : *
41 : : * Status: OPTIONAL
42 : : */
43 : : const char *(* info)(struct Scsi_Host *);
44 : :
45 : : /*
46 : : * Ioctl interface
47 : : *
48 : : * Status: OPTIONAL
49 : : */
50 : : int (*ioctl)(struct scsi_device *dev, unsigned int cmd,
51 : : void __user *arg);
52 : :
53 : :
54 : : #ifdef CONFIG_COMPAT
55 : : /*
56 : : * Compat handler. Handle 32bit ABI.
57 : : * When unknown ioctl is passed return -ENOIOCTLCMD.
58 : : *
59 : : * Status: OPTIONAL
60 : : */
61 : : int (*compat_ioctl)(struct scsi_device *dev, unsigned int cmd,
62 : : void __user *arg);
63 : : #endif
64 : :
65 : : /*
66 : : * The queuecommand function is used to queue up a scsi
67 : : * command block to the LLDD. When the driver finished
68 : : * processing the command the done callback is invoked.
69 : : *
70 : : * If queuecommand returns 0, then the driver has accepted the
71 : : * command. It must also push it to the HBA if the scsi_cmnd
72 : : * flag SCMD_LAST is set, or if the driver does not implement
73 : : * commit_rqs. The done() function must be called on the command
74 : : * when the driver has finished with it. (you may call done on the
75 : : * command before queuecommand returns, but in this case you
76 : : * *must* return 0 from queuecommand).
77 : : *
78 : : * Queuecommand may also reject the command, in which case it may
79 : : * not touch the command and must not call done() for it.
80 : : *
81 : : * There are two possible rejection returns:
82 : : *
83 : : * SCSI_MLQUEUE_DEVICE_BUSY: Block this device temporarily, but
84 : : * allow commands to other devices serviced by this host.
85 : : *
86 : : * SCSI_MLQUEUE_HOST_BUSY: Block all devices served by this
87 : : * host temporarily.
88 : : *
89 : : * For compatibility, any other non-zero return is treated the
90 : : * same as SCSI_MLQUEUE_HOST_BUSY.
91 : : *
92 : : * NOTE: "temporarily" means either until the next command for#
93 : : * this device/host completes, or a period of time determined by
94 : : * I/O pressure in the system if there are no other outstanding
95 : : * commands.
96 : : *
97 : : * STATUS: REQUIRED
98 : : */
99 : : int (* queuecommand)(struct Scsi_Host *, struct scsi_cmnd *);
100 : :
101 : : /*
102 : : * The commit_rqs function is used to trigger a hardware
103 : : * doorbell after some requests have been queued with
104 : : * queuecommand, when an error is encountered before sending
105 : : * the request with SCMD_LAST set.
106 : : *
107 : : * STATUS: OPTIONAL
108 : : */
109 : : void (*commit_rqs)(struct Scsi_Host *, u16);
110 : :
111 : : /*
112 : : * This is an error handling strategy routine. You don't need to
113 : : * define one of these if you don't want to - there is a default
114 : : * routine that is present that should work in most cases. For those
115 : : * driver authors that have the inclination and ability to write their
116 : : * own strategy routine, this is where it is specified. Note - the
117 : : * strategy routine is *ALWAYS* run in the context of the kernel eh
118 : : * thread. Thus you are guaranteed to *NOT* be in an interrupt
119 : : * handler when you execute this, and you are also guaranteed to
120 : : * *NOT* have any other commands being queued while you are in the
121 : : * strategy routine. When you return from this function, operations
122 : : * return to normal.
123 : : *
124 : : * See scsi_error.c scsi_unjam_host for additional comments about
125 : : * what this function should and should not be attempting to do.
126 : : *
127 : : * Status: REQUIRED (at least one of them)
128 : : */
129 : : int (* eh_abort_handler)(struct scsi_cmnd *);
130 : : int (* eh_device_reset_handler)(struct scsi_cmnd *);
131 : : int (* eh_target_reset_handler)(struct scsi_cmnd *);
132 : : int (* eh_bus_reset_handler)(struct scsi_cmnd *);
133 : : int (* eh_host_reset_handler)(struct scsi_cmnd *);
134 : :
135 : : /*
136 : : * Before the mid layer attempts to scan for a new device where none
137 : : * currently exists, it will call this entry in your driver. Should
138 : : * your driver need to allocate any structs or perform any other init
139 : : * items in order to send commands to a currently unused target/lun
140 : : * combo, then this is where you can perform those allocations. This
141 : : * is specifically so that drivers won't have to perform any kind of
142 : : * "is this a new device" checks in their queuecommand routine,
143 : : * thereby making the hot path a bit quicker.
144 : : *
145 : : * Return values: 0 on success, non-0 on failure
146 : : *
147 : : * Deallocation: If we didn't find any devices at this ID, you will
148 : : * get an immediate call to slave_destroy(). If we find something
149 : : * here then you will get a call to slave_configure(), then the
150 : : * device will be used for however long it is kept around, then when
151 : : * the device is removed from the system (or * possibly at reboot
152 : : * time), you will then get a call to slave_destroy(). This is
153 : : * assuming you implement slave_configure and slave_destroy.
154 : : * However, if you allocate memory and hang it off the device struct,
155 : : * then you must implement the slave_destroy() routine at a minimum
156 : : * in order to avoid leaking memory
157 : : * each time a device is tore down.
158 : : *
159 : : * Status: OPTIONAL
160 : : */
161 : : int (* slave_alloc)(struct scsi_device *);
162 : :
163 : : /*
164 : : * Once the device has responded to an INQUIRY and we know the
165 : : * device is online, we call into the low level driver with the
166 : : * struct scsi_device *. If the low level device driver implements
167 : : * this function, it *must* perform the task of setting the queue
168 : : * depth on the device. All other tasks are optional and depend
169 : : * on what the driver supports and various implementation details.
170 : : *
171 : : * Things currently recommended to be handled at this time include:
172 : : *
173 : : * 1. Setting the device queue depth. Proper setting of this is
174 : : * described in the comments for scsi_change_queue_depth.
175 : : * 2. Determining if the device supports the various synchronous
176 : : * negotiation protocols. The device struct will already have
177 : : * responded to INQUIRY and the results of the standard items
178 : : * will have been shoved into the various device flag bits, eg.
179 : : * device->sdtr will be true if the device supports SDTR messages.
180 : : * 3. Allocating command structs that the device will need.
181 : : * 4. Setting the default timeout on this device (if needed).
182 : : * 5. Anything else the low level driver might want to do on a device
183 : : * specific setup basis...
184 : : * 6. Return 0 on success, non-0 on error. The device will be marked
185 : : * as offline on error so that no access will occur. If you return
186 : : * non-0, your slave_destroy routine will never get called for this
187 : : * device, so don't leave any loose memory hanging around, clean
188 : : * up after yourself before returning non-0
189 : : *
190 : : * Status: OPTIONAL
191 : : */
192 : : int (* slave_configure)(struct scsi_device *);
193 : :
194 : : /*
195 : : * Immediately prior to deallocating the device and after all activity
196 : : * has ceased the mid layer calls this point so that the low level
197 : : * driver may completely detach itself from the scsi device and vice
198 : : * versa. The low level driver is responsible for freeing any memory
199 : : * it allocated in the slave_alloc or slave_configure calls.
200 : : *
201 : : * Status: OPTIONAL
202 : : */
203 : : void (* slave_destroy)(struct scsi_device *);
204 : :
205 : : /*
206 : : * Before the mid layer attempts to scan for a new device attached
207 : : * to a target where no target currently exists, it will call this
208 : : * entry in your driver. Should your driver need to allocate any
209 : : * structs or perform any other init items in order to send commands
210 : : * to a currently unused target, then this is where you can perform
211 : : * those allocations.
212 : : *
213 : : * Return values: 0 on success, non-0 on failure
214 : : *
215 : : * Status: OPTIONAL
216 : : */
217 : : int (* target_alloc)(struct scsi_target *);
218 : :
219 : : /*
220 : : * Immediately prior to deallocating the target structure, and
221 : : * after all activity to attached scsi devices has ceased, the
222 : : * midlayer calls this point so that the driver may deallocate
223 : : * and terminate any references to the target.
224 : : *
225 : : * Status: OPTIONAL
226 : : */
227 : : void (* target_destroy)(struct scsi_target *);
228 : :
229 : : /*
230 : : * If a host has the ability to discover targets on its own instead
231 : : * of scanning the entire bus, it can fill in this function and
232 : : * call scsi_scan_host(). This function will be called periodically
233 : : * until it returns 1 with the scsi_host and the elapsed time of
234 : : * the scan in jiffies.
235 : : *
236 : : * Status: OPTIONAL
237 : : */
238 : : int (* scan_finished)(struct Scsi_Host *, unsigned long);
239 : :
240 : : /*
241 : : * If the host wants to be called before the scan starts, but
242 : : * after the midlayer has set up ready for the scan, it can fill
243 : : * in this function.
244 : : *
245 : : * Status: OPTIONAL
246 : : */
247 : : void (* scan_start)(struct Scsi_Host *);
248 : :
249 : : /*
250 : : * Fill in this function to allow the queue depth of this host
251 : : * to be changeable (on a per device basis). Returns either
252 : : * the current queue depth setting (may be different from what
253 : : * was passed in) or an error. An error should only be
254 : : * returned if the requested depth is legal but the driver was
255 : : * unable to set it. If the requested depth is illegal, the
256 : : * driver should set and return the closest legal queue depth.
257 : : *
258 : : * Status: OPTIONAL
259 : : */
260 : : int (* change_queue_depth)(struct scsi_device *, int);
261 : :
262 : : /*
263 : : * This functions lets the driver expose the queue mapping
264 : : * to the block layer.
265 : : *
266 : : * Status: OPTIONAL
267 : : */
268 : : int (* map_queues)(struct Scsi_Host *shost);
269 : :
270 : : /*
271 : : * This function determines the BIOS parameters for a given
272 : : * harddisk. These tend to be numbers that are made up by
273 : : * the host adapter. Parameters:
274 : : * size, device, list (heads, sectors, cylinders)
275 : : *
276 : : * Status: OPTIONAL
277 : : */
278 : : int (* bios_param)(struct scsi_device *, struct block_device *,
279 : : sector_t, int []);
280 : :
281 : : /*
282 : : * This function is called when one or more partitions on the
283 : : * device reach beyond the end of the device.
284 : : *
285 : : * Status: OPTIONAL
286 : : */
287 : : void (*unlock_native_capacity)(struct scsi_device *);
288 : :
289 : : /*
290 : : * Can be used to export driver statistics and other infos to the
291 : : * world outside the kernel ie. userspace and it also provides an
292 : : * interface to feed the driver with information.
293 : : *
294 : : * Status: OBSOLETE
295 : : */
296 : : int (*show_info)(struct seq_file *, struct Scsi_Host *);
297 : : int (*write_info)(struct Scsi_Host *, char *, int);
298 : :
299 : : /*
300 : : * This is an optional routine that allows the transport to become
301 : : * involved when a scsi io timer fires. The return value tells the
302 : : * timer routine how to finish the io timeout handling.
303 : : *
304 : : * Status: OPTIONAL
305 : : */
306 : : enum blk_eh_timer_return (*eh_timed_out)(struct scsi_cmnd *);
307 : :
308 : : /* This is an optional routine that allows transport to initiate
309 : : * LLD adapter or firmware reset using sysfs attribute.
310 : : *
311 : : * Return values: 0 on success, -ve value on failure.
312 : : *
313 : : * Status: OPTIONAL
314 : : */
315 : :
316 : : int (*host_reset)(struct Scsi_Host *shost, int reset_type);
317 : : #define SCSI_ADAPTER_RESET 1
318 : : #define SCSI_FIRMWARE_RESET 2
319 : :
320 : :
321 : : /*
322 : : * Name of proc directory
323 : : */
324 : : const char *proc_name;
325 : :
326 : : /*
327 : : * Used to store the procfs directory if a driver implements the
328 : : * show_info method.
329 : : */
330 : : struct proc_dir_entry *proc_dir;
331 : :
332 : : /*
333 : : * This determines if we will use a non-interrupt driven
334 : : * or an interrupt driven scheme. It is set to the maximum number
335 : : * of simultaneous commands a single hw queue in HBA will accept.
336 : : */
337 : : int can_queue;
338 : :
339 : : /*
340 : : * In many instances, especially where disconnect / reconnect are
341 : : * supported, our host also has an ID on the SCSI bus. If this is
342 : : * the case, then it must be reserved. Please set this_id to -1 if
343 : : * your setup is in single initiator mode, and the host lacks an
344 : : * ID.
345 : : */
346 : : int this_id;
347 : :
348 : : /*
349 : : * This determines the degree to which the host adapter is capable
350 : : * of scatter-gather.
351 : : */
352 : : unsigned short sg_tablesize;
353 : : unsigned short sg_prot_tablesize;
354 : :
355 : : /*
356 : : * Set this if the host adapter has limitations beside segment count.
357 : : */
358 : : unsigned int max_sectors;
359 : :
360 : : /*
361 : : * Maximum size in bytes of a single segment.
362 : : */
363 : : unsigned int max_segment_size;
364 : :
365 : : /*
366 : : * DMA scatter gather segment boundary limit. A segment crossing this
367 : : * boundary will be split in two.
368 : : */
369 : : unsigned long dma_boundary;
370 : :
371 : : unsigned long virt_boundary_mask;
372 : :
373 : : /*
374 : : * This specifies "machine infinity" for host templates which don't
375 : : * limit the transfer size. Note this limit represents an absolute
376 : : * maximum, and may be over the transfer limits allowed for
377 : : * individual devices (e.g. 256 for SCSI-1).
378 : : */
379 : : #define SCSI_DEFAULT_MAX_SECTORS 1024
380 : :
381 : : /*
382 : : * True if this host adapter can make good use of linked commands.
383 : : * This will allow more than one command to be queued to a given
384 : : * unit on a given host. Set this to the maximum number of command
385 : : * blocks to be provided for each device. Set this to 1 for one
386 : : * command block per lun, 2 for two, etc. Do not set this to 0.
387 : : * You should make sure that the host adapter will do the right thing
388 : : * before you try setting this above 1.
389 : : */
390 : : short cmd_per_lun;
391 : :
392 : : /*
393 : : * present contains counter indicating how many boards of this
394 : : * type were found when we did the scan.
395 : : */
396 : : unsigned char present;
397 : :
398 : : /* If use block layer to manage tags, this is tag allocation policy */
399 : : int tag_alloc_policy;
400 : :
401 : : /*
402 : : * Track QUEUE_FULL events and reduce queue depth on demand.
403 : : */
404 : : unsigned track_queue_depth:1;
405 : :
406 : : /*
407 : : * This specifies the mode that a LLD supports.
408 : : */
409 : : unsigned supported_mode:2;
410 : :
411 : : /*
412 : : * True if this host adapter uses unchecked DMA onto an ISA bus.
413 : : */
414 : : unsigned unchecked_isa_dma:1;
415 : :
416 : : /*
417 : : * True for emulated SCSI host adapters (e.g. ATAPI).
418 : : */
419 : : unsigned emulated:1;
420 : :
421 : : /*
422 : : * True if the low-level driver performs its own reset-settle delays.
423 : : */
424 : : unsigned skip_settle_delay:1;
425 : :
426 : : /* True if the controller does not support WRITE SAME */
427 : : unsigned no_write_same:1;
428 : :
429 : : /* True if the low-level driver supports blk-mq only */
430 : : unsigned force_blk_mq:1;
431 : :
432 : : /*
433 : : * Countdown for host blocking with no commands outstanding.
434 : : */
435 : : unsigned int max_host_blocked;
436 : :
437 : : /*
438 : : * Default value for the blocking. If the queue is empty,
439 : : * host_blocked counts down in the request_fn until it restarts
440 : : * host operations as zero is reached.
441 : : *
442 : : * FIXME: This should probably be a value in the template
443 : : */
444 : : #define SCSI_DEFAULT_HOST_BLOCKED 7
445 : :
446 : : /*
447 : : * Pointer to the sysfs class properties for this host, NULL terminated.
448 : : */
449 : : struct device_attribute **shost_attrs;
450 : :
451 : : /*
452 : : * Pointer to the SCSI device properties for this host, NULL terminated.
453 : : */
454 : : struct device_attribute **sdev_attrs;
455 : :
456 : : /*
457 : : * Pointer to the SCSI device attribute groups for this host,
458 : : * NULL terminated.
459 : : */
460 : : const struct attribute_group **sdev_groups;
461 : :
462 : : /*
463 : : * Vendor Identifier associated with the host
464 : : *
465 : : * Note: When specifying vendor_id, be sure to read the
466 : : * Vendor Type and ID formatting requirements specified in
467 : : * scsi_netlink.h
468 : : */
469 : : u64 vendor_id;
470 : :
471 : : /*
472 : : * Additional per-command data allocated for the driver.
473 : : */
474 : : unsigned int cmd_size;
475 : : struct scsi_host_cmd_pool *cmd_pool;
476 : :
477 : : /* Delay for runtime autosuspend */
478 : : int rpm_autosuspend_delay;
479 : : };
480 : :
481 : : /*
482 : : * Temporary #define for host lock push down. Can be removed when all
483 : : * drivers have been updated to take advantage of unlocked
484 : : * queuecommand.
485 : : *
486 : : */
487 : : #define DEF_SCSI_QCMD(func_name) \
488 : : int func_name(struct Scsi_Host *shost, struct scsi_cmnd *cmd) \
489 : : { \
490 : : unsigned long irq_flags; \
491 : : int rc; \
492 : : spin_lock_irqsave(shost->host_lock, irq_flags); \
493 : : rc = func_name##_lck (cmd, cmd->scsi_done); \
494 : : spin_unlock_irqrestore(shost->host_lock, irq_flags); \
495 : : return rc; \
496 : : }
497 : :
498 : :
499 : : /*
500 : : * shost state: If you alter this, you also need to alter scsi_sysfs.c
501 : : * (for the ascii descriptions) and the state model enforcer:
502 : : * scsi_host_set_state()
503 : : */
504 : : enum scsi_host_state {
505 : : SHOST_CREATED = 1,
506 : : SHOST_RUNNING,
507 : : SHOST_CANCEL,
508 : : SHOST_DEL,
509 : : SHOST_RECOVERY,
510 : : SHOST_CANCEL_RECOVERY,
511 : : SHOST_DEL_RECOVERY,
512 : : };
513 : :
514 : : struct Scsi_Host {
515 : : /*
516 : : * __devices is protected by the host_lock, but you should
517 : : * usually use scsi_device_lookup / shost_for_each_device
518 : : * to access it and don't care about locking yourself.
519 : : * In the rare case of being in irq context you can use
520 : : * their __ prefixed variants with the lock held. NEVER
521 : : * access this list directly from a driver.
522 : : */
523 : : struct list_head __devices;
524 : : struct list_head __targets;
525 : :
526 : : struct list_head starved_list;
527 : :
528 : : spinlock_t default_lock;
529 : : spinlock_t *host_lock;
530 : :
531 : : struct mutex scan_mutex;/* serialize scanning activity */
532 : :
533 : : struct list_head eh_cmd_q;
534 : : struct task_struct * ehandler; /* Error recovery thread. */
535 : : struct completion * eh_action; /* Wait for specific actions on the
536 : : host. */
537 : : wait_queue_head_t host_wait;
538 : : struct scsi_host_template *hostt;
539 : : struct scsi_transport_template *transportt;
540 : :
541 : : /* Area to keep a shared tag map */
542 : : struct blk_mq_tag_set tag_set;
543 : :
544 : : atomic_t host_blocked;
545 : :
546 : : unsigned int host_failed; /* commands that failed.
547 : : protected by host_lock */
548 : : unsigned int host_eh_scheduled; /* EH scheduled without command */
549 : :
550 : : unsigned int host_no; /* Used for IOCTL_GET_IDLUN, /proc/scsi et al. */
551 : :
552 : : /* next two fields are used to bound the time spent in error handling */
553 : : int eh_deadline;
554 : : unsigned long last_reset;
555 : :
556 : :
557 : : /*
558 : : * These three parameters can be used to allow for wide scsi,
559 : : * and for host adapters that support multiple busses
560 : : * The last two should be set to 1 more than the actual max id
561 : : * or lun (e.g. 8 for SCSI parallel systems).
562 : : */
563 : : unsigned int max_channel;
564 : : unsigned int max_id;
565 : : u64 max_lun;
566 : :
567 : : /*
568 : : * This is a unique identifier that must be assigned so that we
569 : : * have some way of identifying each detected host adapter properly
570 : : * and uniquely. For hosts that do not support more than one card
571 : : * in the system at one time, this does not need to be set. It is
572 : : * initialized to 0 in scsi_register.
573 : : */
574 : : unsigned int unique_id;
575 : :
576 : : /*
577 : : * The maximum length of SCSI commands that this host can accept.
578 : : * Probably 12 for most host adapters, but could be 16 for others.
579 : : * or 260 if the driver supports variable length cdbs.
580 : : * For drivers that don't set this field, a value of 12 is
581 : : * assumed.
582 : : */
583 : : unsigned short max_cmd_len;
584 : :
585 : : int this_id;
586 : : int can_queue;
587 : : short cmd_per_lun;
588 : : short unsigned int sg_tablesize;
589 : : short unsigned int sg_prot_tablesize;
590 : : unsigned int max_sectors;
591 : : unsigned int max_segment_size;
592 : : unsigned long dma_boundary;
593 : : unsigned long virt_boundary_mask;
594 : : /*
595 : : * In scsi-mq mode, the number of hardware queues supported by the LLD.
596 : : *
597 : : * Note: it is assumed that each hardware queue has a queue depth of
598 : : * can_queue. In other words, the total queue depth per host
599 : : * is nr_hw_queues * can_queue.
600 : : */
601 : : unsigned nr_hw_queues;
602 : : unsigned active_mode:2;
603 : : unsigned unchecked_isa_dma:1;
604 : :
605 : : /*
606 : : * Host has requested that no further requests come through for the
607 : : * time being.
608 : : */
609 : : unsigned host_self_blocked:1;
610 : :
611 : : /*
612 : : * Host uses correct SCSI ordering not PC ordering. The bit is
613 : : * set for the minority of drivers whose authors actually read
614 : : * the spec ;).
615 : : */
616 : : unsigned reverse_ordering:1;
617 : :
618 : : /* Task mgmt function in progress */
619 : : unsigned tmf_in_progress:1;
620 : :
621 : : /* Asynchronous scan in progress */
622 : : unsigned async_scan:1;
623 : :
624 : : /* Don't resume host in EH */
625 : : unsigned eh_noresume:1;
626 : :
627 : : /* The controller does not support WRITE SAME */
628 : : unsigned no_write_same:1;
629 : :
630 : : unsigned use_cmd_list:1;
631 : :
632 : : /* Host responded with short (<36 bytes) INQUIRY result */
633 : : unsigned short_inquiry:1;
634 : :
635 : : /* The transport requires the LUN bits NOT to be stored in CDB[1] */
636 : : unsigned no_scsi2_lun_in_cdb:1;
637 : :
638 : : /*
639 : : * Optional work queue to be utilized by the transport
640 : : */
641 : : char work_q_name[20];
642 : : struct workqueue_struct *work_q;
643 : :
644 : : /*
645 : : * Task management function work queue
646 : : */
647 : : struct workqueue_struct *tmf_work_q;
648 : :
649 : : /*
650 : : * Value host_blocked counts down from
651 : : */
652 : : unsigned int max_host_blocked;
653 : :
654 : : /* Protection Information */
655 : : unsigned int prot_capabilities;
656 : : unsigned char prot_guard_type;
657 : :
658 : : /* legacy crap */
659 : : unsigned long base;
660 : : unsigned long io_port;
661 : : unsigned char n_io_port;
662 : : unsigned char dma_channel;
663 : : unsigned int irq;
664 : :
665 : :
666 : : enum scsi_host_state shost_state;
667 : :
668 : : /* ldm bits */
669 : : struct device shost_gendev, shost_dev;
670 : :
671 : : /*
672 : : * Points to the transport data (if any) which is allocated
673 : : * separately
674 : : */
675 : : void *shost_data;
676 : :
677 : : /*
678 : : * Points to the physical bus device we'd use to do DMA
679 : : * Needed just in case we have virtual hosts.
680 : : */
681 : : struct device *dma_dev;
682 : :
683 : : /*
684 : : * We should ensure that this is aligned, both for better performance
685 : : * and also because some compilers (m68k) don't automatically force
686 : : * alignment to a long boundary.
687 : : */
688 : : unsigned long hostdata[0] /* Used for storage of host specific stuff */
689 : : __attribute__ ((aligned (sizeof(unsigned long))));
690 : : };
691 : :
692 : : #define class_to_shost(d) \
693 : : container_of(d, struct Scsi_Host, shost_dev)
694 : :
695 : : #define shost_printk(prefix, shost, fmt, a...) \
696 : : dev_printk(prefix, &(shost)->shost_gendev, fmt, ##a)
697 : :
698 : 0 : static inline void *shost_priv(struct Scsi_Host *shost)
699 : : {
700 : 0 : return (void *)shost->hostdata;
701 : : }
702 : :
703 : : int scsi_is_host_device(const struct device *);
704 : :
705 : 315 : static inline struct Scsi_Host *dev_to_shost(struct device *dev)
706 : : {
707 [ - + - - : 315 : while (!scsi_is_host_device(dev)) {
- - - - -
+ - + - +
- - - + #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # #
# ]
708 [ # # # # : 0 : if (!dev->parent)
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # #
# ]
709 : : return NULL;
710 : : dev = dev->parent;
711 : : }
712 : 315 : return container_of(dev, struct Scsi_Host, shost_gendev);
713 : : }
714 : :
715 : 24558 : static inline int scsi_host_in_recovery(struct Scsi_Host *shost)
716 : : {
717 : 24558 : return shost->shost_state == SHOST_RECOVERY ||
718 : 24558 : shost->shost_state == SHOST_CANCEL_RECOVERY ||
719 [ + - + + : 24558 : shost->shost_state == SHOST_DEL_RECOVERY ||
+ + + - ]
720 : : shost->tmf_in_progress;
721 : : }
722 : :
723 : : extern int scsi_queue_work(struct Scsi_Host *, struct work_struct *);
724 : : extern void scsi_flush_work(struct Scsi_Host *);
725 : :
726 : : extern struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *, int);
727 : : extern int __must_check scsi_add_host_with_dma(struct Scsi_Host *,
728 : : struct device *,
729 : : struct device *);
730 : : extern void scsi_scan_host(struct Scsi_Host *);
731 : : extern void scsi_rescan_device(struct device *);
732 : : extern void scsi_remove_host(struct Scsi_Host *);
733 : : extern struct Scsi_Host *scsi_host_get(struct Scsi_Host *);
734 : : extern int scsi_host_busy(struct Scsi_Host *shost);
735 : : extern void scsi_host_put(struct Scsi_Host *t);
736 : : extern struct Scsi_Host *scsi_host_lookup(unsigned short);
737 : : extern const char *scsi_host_state_name(enum scsi_host_state);
738 : :
739 : 0 : static inline int __must_check scsi_add_host(struct Scsi_Host *host,
740 : : struct device *dev)
741 : : {
742 : 0 : return scsi_add_host_with_dma(host, dev, dev);
743 : : }
744 : :
745 : : static inline struct device *scsi_get_device(struct Scsi_Host *shost)
746 : : {
747 : : return shost->shost_gendev.parent;
748 : : }
749 : :
750 : : /**
751 : : * scsi_host_scan_allowed - Is scanning of this host allowed
752 : : * @shost: Pointer to Scsi_Host.
753 : : **/
754 : 63 : static inline int scsi_host_scan_allowed(struct Scsi_Host *shost)
755 : : {
756 [ - - - - : 63 : return shost->shost_state == SHOST_RUNNING ||
- - - - +
- ]
757 : : shost->shost_state == SHOST_RECOVERY;
758 : : }
759 : :
760 : : extern void scsi_unblock_requests(struct Scsi_Host *);
761 : : extern void scsi_block_requests(struct Scsi_Host *);
762 : :
763 : : struct class_container;
764 : :
765 : : /*
766 : : * These two functions are used to allocate and free a pseudo device
767 : : * which will connect to the host adapter itself rather than any
768 : : * physical device. You must deallocate when you are done with the
769 : : * thing. This physical pseudo-device isn't real and won't be available
770 : : * from any high-level drivers.
771 : : */
772 : : extern void scsi_free_host_dev(struct scsi_device *);
773 : : extern struct scsi_device *scsi_get_host_dev(struct Scsi_Host *);
774 : :
775 : : /*
776 : : * DIF defines the exchange of protection information between
777 : : * initiator and SBC block device.
778 : : *
779 : : * DIX defines the exchange of protection information between OS and
780 : : * initiator.
781 : : */
782 : : enum scsi_host_prot_capabilities {
783 : : SHOST_DIF_TYPE1_PROTECTION = 1 << 0, /* T10 DIF Type 1 */
784 : : SHOST_DIF_TYPE2_PROTECTION = 1 << 1, /* T10 DIF Type 2 */
785 : : SHOST_DIF_TYPE3_PROTECTION = 1 << 2, /* T10 DIF Type 3 */
786 : :
787 : : SHOST_DIX_TYPE0_PROTECTION = 1 << 3, /* DIX between OS and HBA only */
788 : : SHOST_DIX_TYPE1_PROTECTION = 1 << 4, /* DIX with DIF Type 1 */
789 : : SHOST_DIX_TYPE2_PROTECTION = 1 << 5, /* DIX with DIF Type 2 */
790 : : SHOST_DIX_TYPE3_PROTECTION = 1 << 6, /* DIX with DIF Type 3 */
791 : : };
792 : :
793 : : /*
794 : : * SCSI hosts which support the Data Integrity Extensions must
795 : : * indicate their capabilities by setting the prot_capabilities using
796 : : * this call.
797 : : */
798 : : static inline void scsi_host_set_prot(struct Scsi_Host *shost, unsigned int mask)
799 : : {
800 : : shost->prot_capabilities = mask;
801 : : }
802 : :
803 : 24012 : static inline unsigned int scsi_host_get_prot(struct Scsi_Host *shost)
804 : : {
805 [ - + - + : 24012 : return shost->prot_capabilities;
- + ]
806 : : }
807 : :
808 : 63 : static inline int scsi_host_prot_dma(struct Scsi_Host *shost)
809 : : {
810 [ - + ]: 63 : return shost->prot_capabilities >= SHOST_DIX_TYPE0_PROTECTION;
811 : : }
812 : :
813 : 20562 : static inline unsigned int scsi_host_dif_capable(struct Scsi_Host *shost, unsigned int target_type)
814 : : {
815 : 20562 : static unsigned char cap[] = { 0,
816 : : SHOST_DIF_TYPE1_PROTECTION,
817 : : SHOST_DIF_TYPE2_PROTECTION,
818 : : SHOST_DIF_TYPE3_PROTECTION };
819 : :
820 [ + - - - ]: 20562 : if (target_type >= ARRAY_SIZE(cap))
821 : : return 0;
822 : :
823 [ - - + - : 20562 : return shost->prot_capabilities & cap[target_type] ? target_type : 0;
- - ]
824 : : }
825 : :
826 : 0 : static inline unsigned int scsi_host_dix_capable(struct Scsi_Host *shost, unsigned int target_type)
827 : : {
828 : : #if defined(CONFIG_BLK_DEV_INTEGRITY)
829 : : static unsigned char cap[] = { SHOST_DIX_TYPE0_PROTECTION,
830 : : SHOST_DIX_TYPE1_PROTECTION,
831 : : SHOST_DIX_TYPE2_PROTECTION,
832 : : SHOST_DIX_TYPE3_PROTECTION };
833 : :
834 : : if (target_type >= ARRAY_SIZE(cap))
835 : : return 0;
836 : :
837 : : return shost->prot_capabilities & cap[target_type];
838 : : #endif
839 [ # # ]: 0 : return 0;
840 : : }
841 : :
842 : : /*
843 : : * All DIX-capable initiators must support the T10-mandated CRC
844 : : * checksum. Controllers can optionally implement the IP checksum
845 : : * scheme which has much lower impact on system performance. Note
846 : : * that the main rationale for the checksum is to match integrity
847 : : * metadata with data. Detecting bit errors are a job for ECC memory
848 : : * and buses.
849 : : */
850 : :
851 : : enum scsi_host_guard_type {
852 : : SHOST_DIX_GUARD_CRC = 1 << 0,
853 : : SHOST_DIX_GUARD_IP = 1 << 1,
854 : : };
855 : :
856 : : static inline void scsi_host_set_guard(struct Scsi_Host *shost, unsigned char type)
857 : : {
858 : : shost->prot_guard_type = type;
859 : : }
860 : :
861 : : static inline unsigned char scsi_host_get_guard(struct Scsi_Host *shost)
862 : : {
863 : : return shost->prot_guard_type;
864 : : }
865 : :
866 : : extern int scsi_host_set_state(struct Scsi_Host *, enum scsi_host_state);
867 : :
868 : : #endif /* _SCSI_SCSI_HOST_H */
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