xref: /openbmc/linux/drivers/nvme/host/nvme.h (revision a6c76bb0)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * Copyright (c) 2011-2014, Intel Corporation.
4  */
5 
6 #ifndef _NVME_H
7 #define _NVME_H
8 
9 #include <linux/nvme.h>
10 #include <linux/cdev.h>
11 #include <linux/pci.h>
12 #include <linux/kref.h>
13 #include <linux/blk-mq.h>
14 #include <linux/lightnvm.h>
15 #include <linux/sed-opal.h>
16 #include <linux/fault-inject.h>
17 #include <linux/rcupdate.h>
18 #include <linux/wait.h>
19 #include <linux/t10-pi.h>
20 
21 #include <trace/events/block.h>
22 
23 extern unsigned int nvme_io_timeout;
24 #define NVME_IO_TIMEOUT	(nvme_io_timeout * HZ)
25 
26 extern unsigned int admin_timeout;
27 #define NVME_ADMIN_TIMEOUT	(admin_timeout * HZ)
28 
29 #define NVME_DEFAULT_KATO	5
30 #define NVME_KATO_GRACE		10
31 
32 #ifdef CONFIG_ARCH_NO_SG_CHAIN
33 #define  NVME_INLINE_SG_CNT  0
34 #define  NVME_INLINE_METADATA_SG_CNT  0
35 #else
36 #define  NVME_INLINE_SG_CNT  2
37 #define  NVME_INLINE_METADATA_SG_CNT  1
38 #endif
39 
40 /*
41  * Default to a 4K page size, with the intention to update this
42  * path in the future to accommodate architectures with differing
43  * kernel and IO page sizes.
44  */
45 #define NVME_CTRL_PAGE_SHIFT	12
46 #define NVME_CTRL_PAGE_SIZE	(1 << NVME_CTRL_PAGE_SHIFT)
47 
48 extern struct workqueue_struct *nvme_wq;
49 extern struct workqueue_struct *nvme_reset_wq;
50 extern struct workqueue_struct *nvme_delete_wq;
51 
52 enum {
53 	NVME_NS_LBA		= 0,
54 	NVME_NS_LIGHTNVM	= 1,
55 };
56 
57 /*
58  * List of workarounds for devices that required behavior not specified in
59  * the standard.
60  */
61 enum nvme_quirks {
62 	/*
63 	 * Prefers I/O aligned to a stripe size specified in a vendor
64 	 * specific Identify field.
65 	 */
66 	NVME_QUIRK_STRIPE_SIZE			= (1 << 0),
67 
68 	/*
69 	 * The controller doesn't handle Identify value others than 0 or 1
70 	 * correctly.
71 	 */
72 	NVME_QUIRK_IDENTIFY_CNS			= (1 << 1),
73 
74 	/*
75 	 * The controller deterministically returns O's on reads to
76 	 * logical blocks that deallocate was called on.
77 	 */
78 	NVME_QUIRK_DEALLOCATE_ZEROES		= (1 << 2),
79 
80 	/*
81 	 * The controller needs a delay before starts checking the device
82 	 * readiness, which is done by reading the NVME_CSTS_RDY bit.
83 	 */
84 	NVME_QUIRK_DELAY_BEFORE_CHK_RDY		= (1 << 3),
85 
86 	/*
87 	 * APST should not be used.
88 	 */
89 	NVME_QUIRK_NO_APST			= (1 << 4),
90 
91 	/*
92 	 * The deepest sleep state should not be used.
93 	 */
94 	NVME_QUIRK_NO_DEEPEST_PS		= (1 << 5),
95 
96 	/*
97 	 * Supports the LighNVM command set if indicated in vs[1].
98 	 */
99 	NVME_QUIRK_LIGHTNVM			= (1 << 6),
100 
101 	/*
102 	 * Set MEDIUM priority on SQ creation
103 	 */
104 	NVME_QUIRK_MEDIUM_PRIO_SQ		= (1 << 7),
105 
106 	/*
107 	 * Ignore device provided subnqn.
108 	 */
109 	NVME_QUIRK_IGNORE_DEV_SUBNQN		= (1 << 8),
110 
111 	/*
112 	 * Broken Write Zeroes.
113 	 */
114 	NVME_QUIRK_DISABLE_WRITE_ZEROES		= (1 << 9),
115 
116 	/*
117 	 * Force simple suspend/resume path.
118 	 */
119 	NVME_QUIRK_SIMPLE_SUSPEND		= (1 << 10),
120 
121 	/*
122 	 * Use only one interrupt vector for all queues
123 	 */
124 	NVME_QUIRK_SINGLE_VECTOR		= (1 << 11),
125 
126 	/*
127 	 * Use non-standard 128 bytes SQEs.
128 	 */
129 	NVME_QUIRK_128_BYTES_SQES		= (1 << 12),
130 
131 	/*
132 	 * Prevent tag overlap between queues
133 	 */
134 	NVME_QUIRK_SHARED_TAGS                  = (1 << 13),
135 
136 	/*
137 	 * Don't change the value of the temperature threshold feature
138 	 */
139 	NVME_QUIRK_NO_TEMP_THRESH_CHANGE	= (1 << 14),
140 
141 	/*
142 	 * The controller doesn't handle the Identify Namespace
143 	 * Identification Descriptor list subcommand despite claiming
144 	 * NVMe 1.3 compliance.
145 	 */
146 	NVME_QUIRK_NO_NS_DESC_LIST		= (1 << 15),
147 };
148 
149 /*
150  * Common request structure for NVMe passthrough.  All drivers must have
151  * this structure as the first member of their request-private data.
152  */
153 struct nvme_request {
154 	struct nvme_command	*cmd;
155 	union nvme_result	result;
156 	u8			retries;
157 	u8			flags;
158 	u16			status;
159 	struct nvme_ctrl	*ctrl;
160 };
161 
162 /*
163  * Mark a bio as coming in through the mpath node.
164  */
165 #define REQ_NVME_MPATH		REQ_DRV
166 
167 enum {
168 	NVME_REQ_CANCELLED		= (1 << 0),
169 	NVME_REQ_USERCMD		= (1 << 1),
170 };
171 
172 static inline struct nvme_request *nvme_req(struct request *req)
173 {
174 	return blk_mq_rq_to_pdu(req);
175 }
176 
177 static inline u16 nvme_req_qid(struct request *req)
178 {
179 	if (!req->q->queuedata)
180 		return 0;
181 
182 	return req->mq_hctx->queue_num + 1;
183 }
184 
185 /* The below value is the specific amount of delay needed before checking
186  * readiness in case of the PCI_DEVICE(0x1c58, 0x0003), which needs the
187  * NVME_QUIRK_DELAY_BEFORE_CHK_RDY quirk enabled. The value (in ms) was
188  * found empirically.
189  */
190 #define NVME_QUIRK_DELAY_AMOUNT		2300
191 
192 /*
193  * enum nvme_ctrl_state: Controller state
194  *
195  * @NVME_CTRL_NEW:		New controller just allocated, initial state
196  * @NVME_CTRL_LIVE:		Controller is connected and I/O capable
197  * @NVME_CTRL_RESETTING:	Controller is resetting (or scheduled reset)
198  * @NVME_CTRL_CONNECTING:	Controller is disconnected, now connecting the
199  *				transport
200  * @NVME_CTRL_DELETING:		Controller is deleting (or scheduled deletion)
201  * @NVME_CTRL_DELETING_NOIO:	Controller is deleting and I/O is not
202  *				disabled/failed immediately. This state comes
203  * 				after all async event processing took place and
204  * 				before ns removal and the controller deletion
205  * 				progress
206  * @NVME_CTRL_DEAD:		Controller is non-present/unresponsive during
207  *				shutdown or removal. In this case we forcibly
208  *				kill all inflight I/O as they have no chance to
209  *				complete
210  */
211 enum nvme_ctrl_state {
212 	NVME_CTRL_NEW,
213 	NVME_CTRL_LIVE,
214 	NVME_CTRL_RESETTING,
215 	NVME_CTRL_CONNECTING,
216 	NVME_CTRL_DELETING,
217 	NVME_CTRL_DELETING_NOIO,
218 	NVME_CTRL_DEAD,
219 };
220 
221 struct nvme_fault_inject {
222 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
223 	struct fault_attr attr;
224 	struct dentry *parent;
225 	bool dont_retry;	/* DNR, do not retry */
226 	u16 status;		/* status code */
227 #endif
228 };
229 
230 struct nvme_ctrl {
231 	bool comp_seen;
232 	enum nvme_ctrl_state state;
233 	bool identified;
234 	spinlock_t lock;
235 	struct mutex scan_lock;
236 	const struct nvme_ctrl_ops *ops;
237 	struct request_queue *admin_q;
238 	struct request_queue *connect_q;
239 	struct request_queue *fabrics_q;
240 	struct device *dev;
241 	int instance;
242 	int numa_node;
243 	struct blk_mq_tag_set *tagset;
244 	struct blk_mq_tag_set *admin_tagset;
245 	struct list_head namespaces;
246 	struct rw_semaphore namespaces_rwsem;
247 	struct device ctrl_device;
248 	struct device *device;	/* char device */
249 	struct cdev cdev;
250 	struct work_struct reset_work;
251 	struct work_struct delete_work;
252 	wait_queue_head_t state_wq;
253 
254 	struct nvme_subsystem *subsys;
255 	struct list_head subsys_entry;
256 
257 	struct opal_dev *opal_dev;
258 
259 	char name[12];
260 	u16 cntlid;
261 
262 	u32 ctrl_config;
263 	u16 mtfa;
264 	u32 queue_count;
265 
266 	u64 cap;
267 	u32 max_hw_sectors;
268 	u32 max_segments;
269 	u32 max_integrity_segments;
270 #ifdef CONFIG_BLK_DEV_ZONED
271 	u32 max_zone_append;
272 #endif
273 	u16 crdt[3];
274 	u16 oncs;
275 	u16 oacs;
276 	u16 nssa;
277 	u16 nr_streams;
278 	u16 sqsize;
279 	u32 max_namespaces;
280 	atomic_t abort_limit;
281 	u8 vwc;
282 	u32 vs;
283 	u32 sgls;
284 	u16 kas;
285 	u8 npss;
286 	u8 apsta;
287 	u16 wctemp;
288 	u16 cctemp;
289 	u32 oaes;
290 	u32 aen_result;
291 	u32 ctratt;
292 	unsigned int shutdown_timeout;
293 	unsigned int kato;
294 	bool subsystem;
295 	unsigned long quirks;
296 	struct nvme_id_power_state psd[32];
297 	struct nvme_effects_log *effects;
298 	struct xarray cels;
299 	struct work_struct scan_work;
300 	struct work_struct async_event_work;
301 	struct delayed_work ka_work;
302 	struct delayed_work failfast_work;
303 	struct nvme_command ka_cmd;
304 	struct work_struct fw_act_work;
305 	unsigned long events;
306 
307 #ifdef CONFIG_NVME_MULTIPATH
308 	/* asymmetric namespace access: */
309 	u8 anacap;
310 	u8 anatt;
311 	u32 anagrpmax;
312 	u32 nanagrpid;
313 	struct mutex ana_lock;
314 	struct nvme_ana_rsp_hdr *ana_log_buf;
315 	size_t ana_log_size;
316 	struct timer_list anatt_timer;
317 	struct work_struct ana_work;
318 #endif
319 
320 	/* Power saving configuration */
321 	u64 ps_max_latency_us;
322 	bool apst_enabled;
323 
324 	/* PCIe only: */
325 	u32 hmpre;
326 	u32 hmmin;
327 	u32 hmminds;
328 	u16 hmmaxd;
329 
330 	/* Fabrics only */
331 	u32 ioccsz;
332 	u32 iorcsz;
333 	u16 icdoff;
334 	u16 maxcmd;
335 	int nr_reconnects;
336 	unsigned long flags;
337 #define NVME_CTRL_FAILFAST_EXPIRED	0
338 	struct nvmf_ctrl_options *opts;
339 
340 	struct page *discard_page;
341 	unsigned long discard_page_busy;
342 
343 	struct nvme_fault_inject fault_inject;
344 };
345 
346 enum nvme_iopolicy {
347 	NVME_IOPOLICY_NUMA,
348 	NVME_IOPOLICY_RR,
349 };
350 
351 struct nvme_subsystem {
352 	int			instance;
353 	struct device		dev;
354 	/*
355 	 * Because we unregister the device on the last put we need
356 	 * a separate refcount.
357 	 */
358 	struct kref		ref;
359 	struct list_head	entry;
360 	struct mutex		lock;
361 	struct list_head	ctrls;
362 	struct list_head	nsheads;
363 	char			subnqn[NVMF_NQN_SIZE];
364 	char			serial[20];
365 	char			model[40];
366 	char			firmware_rev[8];
367 	u8			cmic;
368 	u16			vendor_id;
369 	u16			awupf;	/* 0's based awupf value. */
370 	struct ida		ns_ida;
371 #ifdef CONFIG_NVME_MULTIPATH
372 	enum nvme_iopolicy	iopolicy;
373 #endif
374 };
375 
376 /*
377  * Container structure for uniqueue namespace identifiers.
378  */
379 struct nvme_ns_ids {
380 	u8	eui64[8];
381 	u8	nguid[16];
382 	uuid_t	uuid;
383 	u8	csi;
384 };
385 
386 /*
387  * Anchor structure for namespaces.  There is one for each namespace in a
388  * NVMe subsystem that any of our controllers can see, and the namespace
389  * structure for each controller is chained of it.  For private namespaces
390  * there is a 1:1 relation to our namespace structures, that is ->list
391  * only ever has a single entry for private namespaces.
392  */
393 struct nvme_ns_head {
394 	struct list_head	list;
395 	struct srcu_struct      srcu;
396 	struct nvme_subsystem	*subsys;
397 	unsigned		ns_id;
398 	struct nvme_ns_ids	ids;
399 	struct list_head	entry;
400 	struct kref		ref;
401 	bool			shared;
402 	int			instance;
403 	struct nvme_effects_log *effects;
404 #ifdef CONFIG_NVME_MULTIPATH
405 	struct gendisk		*disk;
406 	struct bio_list		requeue_list;
407 	spinlock_t		requeue_lock;
408 	struct work_struct	requeue_work;
409 	struct mutex		lock;
410 	unsigned long		flags;
411 #define NVME_NSHEAD_DISK_LIVE	0
412 	struct nvme_ns __rcu	*current_path[];
413 #endif
414 };
415 
416 enum nvme_ns_features {
417 	NVME_NS_EXT_LBAS = 1 << 0, /* support extended LBA format */
418 	NVME_NS_METADATA_SUPPORTED = 1 << 1, /* support getting generated md */
419 };
420 
421 struct nvme_ns {
422 	struct list_head list;
423 
424 	struct nvme_ctrl *ctrl;
425 	struct request_queue *queue;
426 	struct gendisk *disk;
427 #ifdef CONFIG_NVME_MULTIPATH
428 	enum nvme_ana_state ana_state;
429 	u32 ana_grpid;
430 #endif
431 	struct list_head siblings;
432 	struct nvm_dev *ndev;
433 	struct kref kref;
434 	struct nvme_ns_head *head;
435 
436 	int lba_shift;
437 	u16 ms;
438 	u16 sgs;
439 	u32 sws;
440 	u8 pi_type;
441 #ifdef CONFIG_BLK_DEV_ZONED
442 	u64 zsze;
443 #endif
444 	unsigned long features;
445 	unsigned long flags;
446 #define NVME_NS_REMOVING	0
447 #define NVME_NS_DEAD     	1
448 #define NVME_NS_ANA_PENDING	2
449 #define NVME_NS_FORCE_RO	3
450 
451 	struct nvme_fault_inject fault_inject;
452 
453 };
454 
455 /* NVMe ns supports metadata actions by the controller (generate/strip) */
456 static inline bool nvme_ns_has_pi(struct nvme_ns *ns)
457 {
458 	return ns->pi_type && ns->ms == sizeof(struct t10_pi_tuple);
459 }
460 
461 struct nvme_ctrl_ops {
462 	const char *name;
463 	struct module *module;
464 	unsigned int flags;
465 #define NVME_F_FABRICS			(1 << 0)
466 #define NVME_F_METADATA_SUPPORTED	(1 << 1)
467 #define NVME_F_PCI_P2PDMA		(1 << 2)
468 	int (*reg_read32)(struct nvme_ctrl *ctrl, u32 off, u32 *val);
469 	int (*reg_write32)(struct nvme_ctrl *ctrl, u32 off, u32 val);
470 	int (*reg_read64)(struct nvme_ctrl *ctrl, u32 off, u64 *val);
471 	void (*free_ctrl)(struct nvme_ctrl *ctrl);
472 	void (*submit_async_event)(struct nvme_ctrl *ctrl);
473 	void (*delete_ctrl)(struct nvme_ctrl *ctrl);
474 	int (*get_address)(struct nvme_ctrl *ctrl, char *buf, int size);
475 };
476 
477 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
478 void nvme_fault_inject_init(struct nvme_fault_inject *fault_inj,
479 			    const char *dev_name);
480 void nvme_fault_inject_fini(struct nvme_fault_inject *fault_inject);
481 void nvme_should_fail(struct request *req);
482 #else
483 static inline void nvme_fault_inject_init(struct nvme_fault_inject *fault_inj,
484 					  const char *dev_name)
485 {
486 }
487 static inline void nvme_fault_inject_fini(struct nvme_fault_inject *fault_inj)
488 {
489 }
490 static inline void nvme_should_fail(struct request *req) {}
491 #endif
492 
493 static inline int nvme_reset_subsystem(struct nvme_ctrl *ctrl)
494 {
495 	if (!ctrl->subsystem)
496 		return -ENOTTY;
497 	return ctrl->ops->reg_write32(ctrl, NVME_REG_NSSR, 0x4E564D65);
498 }
499 
500 /*
501  * Convert a 512B sector number to a device logical block number.
502  */
503 static inline u64 nvme_sect_to_lba(struct nvme_ns *ns, sector_t sector)
504 {
505 	return sector >> (ns->lba_shift - SECTOR_SHIFT);
506 }
507 
508 /*
509  * Convert a device logical block number to a 512B sector number.
510  */
511 static inline sector_t nvme_lba_to_sect(struct nvme_ns *ns, u64 lba)
512 {
513 	return lba << (ns->lba_shift - SECTOR_SHIFT);
514 }
515 
516 /*
517  * Convert byte length to nvme's 0-based num dwords
518  */
519 static inline u32 nvme_bytes_to_numd(size_t len)
520 {
521 	return (len >> 2) - 1;
522 }
523 
524 static inline bool nvme_is_ana_error(u16 status)
525 {
526 	switch (status & 0x7ff) {
527 	case NVME_SC_ANA_TRANSITION:
528 	case NVME_SC_ANA_INACCESSIBLE:
529 	case NVME_SC_ANA_PERSISTENT_LOSS:
530 		return true;
531 	default:
532 		return false;
533 	}
534 }
535 
536 static inline bool nvme_is_path_error(u16 status)
537 {
538 	/* check for a status code type of 'path related status' */
539 	return (status & 0x700) == 0x300;
540 }
541 
542 /*
543  * Fill in the status and result information from the CQE, and then figure out
544  * if blk-mq will need to use IPI magic to complete the request, and if yes do
545  * so.  If not let the caller complete the request without an indirect function
546  * call.
547  */
548 static inline bool nvme_try_complete_req(struct request *req, __le16 status,
549 		union nvme_result result)
550 {
551 	struct nvme_request *rq = nvme_req(req);
552 
553 	rq->status = le16_to_cpu(status) >> 1;
554 	rq->result = result;
555 	/* inject error when permitted by fault injection framework */
556 	nvme_should_fail(req);
557 	if (unlikely(blk_should_fake_timeout(req->q)))
558 		return true;
559 	return blk_mq_complete_request_remote(req);
560 }
561 
562 static inline void nvme_get_ctrl(struct nvme_ctrl *ctrl)
563 {
564 	get_device(ctrl->device);
565 }
566 
567 static inline void nvme_put_ctrl(struct nvme_ctrl *ctrl)
568 {
569 	put_device(ctrl->device);
570 }
571 
572 static inline bool nvme_is_aen_req(u16 qid, __u16 command_id)
573 {
574 	return !qid && command_id >= NVME_AQ_BLK_MQ_DEPTH;
575 }
576 
577 void nvme_complete_rq(struct request *req);
578 bool nvme_cancel_request(struct request *req, void *data, bool reserved);
579 bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
580 		enum nvme_ctrl_state new_state);
581 bool nvme_wait_reset(struct nvme_ctrl *ctrl);
582 int nvme_disable_ctrl(struct nvme_ctrl *ctrl);
583 int nvme_enable_ctrl(struct nvme_ctrl *ctrl);
584 int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl);
585 int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
586 		const struct nvme_ctrl_ops *ops, unsigned long quirks);
587 void nvme_uninit_ctrl(struct nvme_ctrl *ctrl);
588 void nvme_start_ctrl(struct nvme_ctrl *ctrl);
589 void nvme_stop_ctrl(struct nvme_ctrl *ctrl);
590 int nvme_init_identify(struct nvme_ctrl *ctrl);
591 
592 void nvme_remove_namespaces(struct nvme_ctrl *ctrl);
593 
594 int nvme_sec_submit(void *data, u16 spsp, u8 secp, void *buffer, size_t len,
595 		bool send);
596 
597 void nvme_complete_async_event(struct nvme_ctrl *ctrl, __le16 status,
598 		volatile union nvme_result *res);
599 
600 void nvme_stop_queues(struct nvme_ctrl *ctrl);
601 void nvme_start_queues(struct nvme_ctrl *ctrl);
602 void nvme_kill_queues(struct nvme_ctrl *ctrl);
603 void nvme_sync_queues(struct nvme_ctrl *ctrl);
604 void nvme_sync_io_queues(struct nvme_ctrl *ctrl);
605 void nvme_unfreeze(struct nvme_ctrl *ctrl);
606 void nvme_wait_freeze(struct nvme_ctrl *ctrl);
607 int nvme_wait_freeze_timeout(struct nvme_ctrl *ctrl, long timeout);
608 void nvme_start_freeze(struct nvme_ctrl *ctrl);
609 
610 #define NVME_QID_ANY -1
611 struct request *nvme_alloc_request(struct request_queue *q,
612 		struct nvme_command *cmd, blk_mq_req_flags_t flags);
613 void nvme_cleanup_cmd(struct request *req);
614 blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
615 		struct nvme_command *cmd);
616 int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
617 		void *buf, unsigned bufflen);
618 int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
619 		union nvme_result *result, void *buffer, unsigned bufflen,
620 		unsigned timeout, int qid, int at_head,
621 		blk_mq_req_flags_t flags, bool poll);
622 int nvme_set_features(struct nvme_ctrl *dev, unsigned int fid,
623 		      unsigned int dword11, void *buffer, size_t buflen,
624 		      u32 *result);
625 int nvme_get_features(struct nvme_ctrl *dev, unsigned int fid,
626 		      unsigned int dword11, void *buffer, size_t buflen,
627 		      u32 *result);
628 int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count);
629 void nvme_stop_keep_alive(struct nvme_ctrl *ctrl);
630 int nvme_reset_ctrl(struct nvme_ctrl *ctrl);
631 int nvme_try_sched_reset(struct nvme_ctrl *ctrl);
632 int nvme_delete_ctrl(struct nvme_ctrl *ctrl);
633 
634 int nvme_get_log(struct nvme_ctrl *ctrl, u32 nsid, u8 log_page, u8 lsp, u8 csi,
635 		void *log, size_t size, u64 offset);
636 struct nvme_ns *nvme_get_ns_from_disk(struct gendisk *disk,
637 		struct nvme_ns_head **head, int *srcu_idx);
638 void nvme_put_ns_from_disk(struct nvme_ns_head *head, int idx);
639 
640 extern const struct attribute_group *nvme_ns_id_attr_groups[];
641 extern const struct block_device_operations nvme_ns_head_ops;
642 
643 #ifdef CONFIG_NVME_MULTIPATH
644 static inline bool nvme_ctrl_use_ana(struct nvme_ctrl *ctrl)
645 {
646 	return ctrl->ana_log_buf != NULL;
647 }
648 
649 void nvme_mpath_unfreeze(struct nvme_subsystem *subsys);
650 void nvme_mpath_wait_freeze(struct nvme_subsystem *subsys);
651 void nvme_mpath_start_freeze(struct nvme_subsystem *subsys);
652 void nvme_set_disk_name(char *disk_name, struct nvme_ns *ns,
653 			struct nvme_ctrl *ctrl, int *flags);
654 void nvme_failover_req(struct request *req);
655 void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl);
656 int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl,struct nvme_ns_head *head);
657 void nvme_mpath_add_disk(struct nvme_ns *ns, struct nvme_id_ns *id);
658 void nvme_mpath_remove_disk(struct nvme_ns_head *head);
659 int nvme_mpath_init(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id);
660 void nvme_mpath_uninit(struct nvme_ctrl *ctrl);
661 void nvme_mpath_stop(struct nvme_ctrl *ctrl);
662 bool nvme_mpath_clear_current_path(struct nvme_ns *ns);
663 void nvme_mpath_clear_ctrl_paths(struct nvme_ctrl *ctrl);
664 struct nvme_ns *nvme_find_path(struct nvme_ns_head *head);
665 blk_qc_t nvme_ns_head_submit_bio(struct bio *bio);
666 
667 static inline void nvme_mpath_check_last_path(struct nvme_ns *ns)
668 {
669 	struct nvme_ns_head *head = ns->head;
670 
671 	if (head->disk && list_empty(&head->list))
672 		kblockd_schedule_work(&head->requeue_work);
673 }
674 
675 static inline void nvme_trace_bio_complete(struct request *req)
676 {
677 	struct nvme_ns *ns = req->q->queuedata;
678 
679 	if (req->cmd_flags & REQ_NVME_MPATH)
680 		trace_block_bio_complete(ns->head->disk->queue, req->bio);
681 }
682 
683 extern struct device_attribute dev_attr_ana_grpid;
684 extern struct device_attribute dev_attr_ana_state;
685 extern struct device_attribute subsys_attr_iopolicy;
686 
687 #else
688 static inline bool nvme_ctrl_use_ana(struct nvme_ctrl *ctrl)
689 {
690 	return false;
691 }
692 /*
693  * Without the multipath code enabled, multiple controller per subsystems are
694  * visible as devices and thus we cannot use the subsystem instance.
695  */
696 static inline void nvme_set_disk_name(char *disk_name, struct nvme_ns *ns,
697 				      struct nvme_ctrl *ctrl, int *flags)
698 {
699 	sprintf(disk_name, "nvme%dn%d", ctrl->instance, ns->head->instance);
700 }
701 
702 static inline void nvme_failover_req(struct request *req)
703 {
704 }
705 static inline void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl)
706 {
707 }
708 static inline int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl,
709 		struct nvme_ns_head *head)
710 {
711 	return 0;
712 }
713 static inline void nvme_mpath_add_disk(struct nvme_ns *ns,
714 		struct nvme_id_ns *id)
715 {
716 }
717 static inline void nvme_mpath_remove_disk(struct nvme_ns_head *head)
718 {
719 }
720 static inline bool nvme_mpath_clear_current_path(struct nvme_ns *ns)
721 {
722 	return false;
723 }
724 static inline void nvme_mpath_clear_ctrl_paths(struct nvme_ctrl *ctrl)
725 {
726 }
727 static inline void nvme_mpath_check_last_path(struct nvme_ns *ns)
728 {
729 }
730 static inline void nvme_trace_bio_complete(struct request *req)
731 {
732 }
733 static inline int nvme_mpath_init(struct nvme_ctrl *ctrl,
734 		struct nvme_id_ctrl *id)
735 {
736 	if (ctrl->subsys->cmic & (1 << 3))
737 		dev_warn(ctrl->device,
738 "Please enable CONFIG_NVME_MULTIPATH for full support of multi-port devices.\n");
739 	return 0;
740 }
741 static inline void nvme_mpath_uninit(struct nvme_ctrl *ctrl)
742 {
743 }
744 static inline void nvme_mpath_stop(struct nvme_ctrl *ctrl)
745 {
746 }
747 static inline void nvme_mpath_unfreeze(struct nvme_subsystem *subsys)
748 {
749 }
750 static inline void nvme_mpath_wait_freeze(struct nvme_subsystem *subsys)
751 {
752 }
753 static inline void nvme_mpath_start_freeze(struct nvme_subsystem *subsys)
754 {
755 }
756 #endif /* CONFIG_NVME_MULTIPATH */
757 
758 int nvme_revalidate_zones(struct nvme_ns *ns);
759 #ifdef CONFIG_BLK_DEV_ZONED
760 int nvme_update_zone_info(struct nvme_ns *ns, unsigned lbaf);
761 int nvme_report_zones(struct gendisk *disk, sector_t sector,
762 		      unsigned int nr_zones, report_zones_cb cb, void *data);
763 
764 blk_status_t nvme_setup_zone_mgmt_send(struct nvme_ns *ns, struct request *req,
765 				       struct nvme_command *cmnd,
766 				       enum nvme_zone_mgmt_action action);
767 #else
768 #define nvme_report_zones NULL
769 
770 static inline blk_status_t nvme_setup_zone_mgmt_send(struct nvme_ns *ns,
771 		struct request *req, struct nvme_command *cmnd,
772 		enum nvme_zone_mgmt_action action)
773 {
774 	return BLK_STS_NOTSUPP;
775 }
776 
777 static inline int nvme_update_zone_info(struct nvme_ns *ns, unsigned lbaf)
778 {
779 	dev_warn(ns->ctrl->device,
780 		 "Please enable CONFIG_BLK_DEV_ZONED to support ZNS devices\n");
781 	return -EPROTONOSUPPORT;
782 }
783 #endif
784 
785 #ifdef CONFIG_NVM
786 int nvme_nvm_register(struct nvme_ns *ns, char *disk_name, int node);
787 void nvme_nvm_unregister(struct nvme_ns *ns);
788 extern const struct attribute_group nvme_nvm_attr_group;
789 int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd, unsigned long arg);
790 #else
791 static inline int nvme_nvm_register(struct nvme_ns *ns, char *disk_name,
792 				    int node)
793 {
794 	return 0;
795 }
796 
797 static inline void nvme_nvm_unregister(struct nvme_ns *ns) {};
798 static inline int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd,
799 							unsigned long arg)
800 {
801 	return -ENOTTY;
802 }
803 #endif /* CONFIG_NVM */
804 
805 static inline struct nvme_ns *nvme_get_ns_from_dev(struct device *dev)
806 {
807 	return dev_to_disk(dev)->private_data;
808 }
809 
810 #ifdef CONFIG_NVME_HWMON
811 int nvme_hwmon_init(struct nvme_ctrl *ctrl);
812 #else
813 static inline int nvme_hwmon_init(struct nvme_ctrl *ctrl)
814 {
815 	return 0;
816 }
817 #endif
818 
819 u32 nvme_command_effects(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
820 			 u8 opcode);
821 void nvme_execute_passthru_rq(struct request *rq);
822 struct nvme_ctrl *nvme_ctrl_from_file(struct file *file);
823 struct nvme_ns *nvme_find_get_ns(struct nvme_ctrl *ctrl, unsigned nsid);
824 void nvme_put_ns(struct nvme_ns *ns);
825 
826 #endif /* _NVME_H */
827