xref: /openbmc/linux/drivers/nvme/host/nvme.h (revision 48ca54e3)
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/sed-opal.h>
15 #include <linux/fault-inject.h>
16 #include <linux/rcupdate.h>
17 #include <linux/wait.h>
18 #include <linux/t10-pi.h>
19 
20 #include <trace/events/block.h>
21 
22 extern unsigned int nvme_io_timeout;
23 #define NVME_IO_TIMEOUT	(nvme_io_timeout * HZ)
24 
25 extern unsigned int admin_timeout;
26 #define NVME_ADMIN_TIMEOUT	(admin_timeout * HZ)
27 
28 #define NVME_DEFAULT_KATO	5
29 
30 #ifdef CONFIG_ARCH_NO_SG_CHAIN
31 #define  NVME_INLINE_SG_CNT  0
32 #define  NVME_INLINE_METADATA_SG_CNT  0
33 #else
34 #define  NVME_INLINE_SG_CNT  2
35 #define  NVME_INLINE_METADATA_SG_CNT  1
36 #endif
37 
38 /*
39  * Default to a 4K page size, with the intention to update this
40  * path in the future to accommodate architectures with differing
41  * kernel and IO page sizes.
42  */
43 #define NVME_CTRL_PAGE_SHIFT	12
44 #define NVME_CTRL_PAGE_SIZE	(1 << NVME_CTRL_PAGE_SHIFT)
45 
46 extern struct workqueue_struct *nvme_wq;
47 extern struct workqueue_struct *nvme_reset_wq;
48 extern struct workqueue_struct *nvme_delete_wq;
49 
50 /*
51  * List of workarounds for devices that required behavior not specified in
52  * the standard.
53  */
54 enum nvme_quirks {
55 	/*
56 	 * Prefers I/O aligned to a stripe size specified in a vendor
57 	 * specific Identify field.
58 	 */
59 	NVME_QUIRK_STRIPE_SIZE			= (1 << 0),
60 
61 	/*
62 	 * The controller doesn't handle Identify value others than 0 or 1
63 	 * correctly.
64 	 */
65 	NVME_QUIRK_IDENTIFY_CNS			= (1 << 1),
66 
67 	/*
68 	 * The controller deterministically returns O's on reads to
69 	 * logical blocks that deallocate was called on.
70 	 */
71 	NVME_QUIRK_DEALLOCATE_ZEROES		= (1 << 2),
72 
73 	/*
74 	 * The controller needs a delay before starts checking the device
75 	 * readiness, which is done by reading the NVME_CSTS_RDY bit.
76 	 */
77 	NVME_QUIRK_DELAY_BEFORE_CHK_RDY		= (1 << 3),
78 
79 	/*
80 	 * APST should not be used.
81 	 */
82 	NVME_QUIRK_NO_APST			= (1 << 4),
83 
84 	/*
85 	 * The deepest sleep state should not be used.
86 	 */
87 	NVME_QUIRK_NO_DEEPEST_PS		= (1 << 5),
88 
89 	/*
90 	 * Set MEDIUM priority on SQ creation
91 	 */
92 	NVME_QUIRK_MEDIUM_PRIO_SQ		= (1 << 7),
93 
94 	/*
95 	 * Ignore device provided subnqn.
96 	 */
97 	NVME_QUIRK_IGNORE_DEV_SUBNQN		= (1 << 8),
98 
99 	/*
100 	 * Broken Write Zeroes.
101 	 */
102 	NVME_QUIRK_DISABLE_WRITE_ZEROES		= (1 << 9),
103 
104 	/*
105 	 * Force simple suspend/resume path.
106 	 */
107 	NVME_QUIRK_SIMPLE_SUSPEND		= (1 << 10),
108 
109 	/*
110 	 * Use only one interrupt vector for all queues
111 	 */
112 	NVME_QUIRK_SINGLE_VECTOR		= (1 << 11),
113 
114 	/*
115 	 * Use non-standard 128 bytes SQEs.
116 	 */
117 	NVME_QUIRK_128_BYTES_SQES		= (1 << 12),
118 
119 	/*
120 	 * Prevent tag overlap between queues
121 	 */
122 	NVME_QUIRK_SHARED_TAGS                  = (1 << 13),
123 
124 	/*
125 	 * Don't change the value of the temperature threshold feature
126 	 */
127 	NVME_QUIRK_NO_TEMP_THRESH_CHANGE	= (1 << 14),
128 
129 	/*
130 	 * The controller doesn't handle the Identify Namespace
131 	 * Identification Descriptor list subcommand despite claiming
132 	 * NVMe 1.3 compliance.
133 	 */
134 	NVME_QUIRK_NO_NS_DESC_LIST		= (1 << 15),
135 
136 	/*
137 	 * The controller does not properly handle DMA addresses over
138 	 * 48 bits.
139 	 */
140 	NVME_QUIRK_DMA_ADDRESS_BITS_48		= (1 << 16),
141 
142 	/*
143 	 * The controller requires the command_id value be be limited, so skip
144 	 * encoding the generation sequence number.
145 	 */
146 	NVME_QUIRK_SKIP_CID_GEN			= (1 << 17),
147 
148 	/*
149 	 * Reports garbage in the namespace identifiers (eui64, nguid, uuid).
150 	 */
151 	NVME_QUIRK_BOGUS_NID			= (1 << 18),
152 };
153 
154 /*
155  * Common request structure for NVMe passthrough.  All drivers must have
156  * this structure as the first member of their request-private data.
157  */
158 struct nvme_request {
159 	struct nvme_command	*cmd;
160 	union nvme_result	result;
161 	u8			genctr;
162 	u8			retries;
163 	u8			flags;
164 	u16			status;
165 	struct nvme_ctrl	*ctrl;
166 };
167 
168 /*
169  * Mark a bio as coming in through the mpath node.
170  */
171 #define REQ_NVME_MPATH		REQ_DRV
172 
173 enum {
174 	NVME_REQ_CANCELLED		= (1 << 0),
175 	NVME_REQ_USERCMD		= (1 << 1),
176 };
177 
178 static inline struct nvme_request *nvme_req(struct request *req)
179 {
180 	return blk_mq_rq_to_pdu(req);
181 }
182 
183 static inline u16 nvme_req_qid(struct request *req)
184 {
185 	if (!req->q->queuedata)
186 		return 0;
187 
188 	return req->mq_hctx->queue_num + 1;
189 }
190 
191 /* The below value is the specific amount of delay needed before checking
192  * readiness in case of the PCI_DEVICE(0x1c58, 0x0003), which needs the
193  * NVME_QUIRK_DELAY_BEFORE_CHK_RDY quirk enabled. The value (in ms) was
194  * found empirically.
195  */
196 #define NVME_QUIRK_DELAY_AMOUNT		2300
197 
198 /*
199  * enum nvme_ctrl_state: Controller state
200  *
201  * @NVME_CTRL_NEW:		New controller just allocated, initial state
202  * @NVME_CTRL_LIVE:		Controller is connected and I/O capable
203  * @NVME_CTRL_RESETTING:	Controller is resetting (or scheduled reset)
204  * @NVME_CTRL_CONNECTING:	Controller is disconnected, now connecting the
205  *				transport
206  * @NVME_CTRL_DELETING:		Controller is deleting (or scheduled deletion)
207  * @NVME_CTRL_DELETING_NOIO:	Controller is deleting and I/O is not
208  *				disabled/failed immediately. This state comes
209  * 				after all async event processing took place and
210  * 				before ns removal and the controller deletion
211  * 				progress
212  * @NVME_CTRL_DEAD:		Controller is non-present/unresponsive during
213  *				shutdown or removal. In this case we forcibly
214  *				kill all inflight I/O as they have no chance to
215  *				complete
216  */
217 enum nvme_ctrl_state {
218 	NVME_CTRL_NEW,
219 	NVME_CTRL_LIVE,
220 	NVME_CTRL_RESETTING,
221 	NVME_CTRL_CONNECTING,
222 	NVME_CTRL_DELETING,
223 	NVME_CTRL_DELETING_NOIO,
224 	NVME_CTRL_DEAD,
225 };
226 
227 struct nvme_fault_inject {
228 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
229 	struct fault_attr attr;
230 	struct dentry *parent;
231 	bool dont_retry;	/* DNR, do not retry */
232 	u16 status;		/* status code */
233 #endif
234 };
235 
236 struct nvme_ctrl {
237 	bool comp_seen;
238 	enum nvme_ctrl_state state;
239 	bool identified;
240 	spinlock_t lock;
241 	struct mutex scan_lock;
242 	const struct nvme_ctrl_ops *ops;
243 	struct request_queue *admin_q;
244 	struct request_queue *connect_q;
245 	struct request_queue *fabrics_q;
246 	struct device *dev;
247 	int instance;
248 	int numa_node;
249 	struct blk_mq_tag_set *tagset;
250 	struct blk_mq_tag_set *admin_tagset;
251 	struct list_head namespaces;
252 	struct rw_semaphore namespaces_rwsem;
253 	struct device ctrl_device;
254 	struct device *device;	/* char device */
255 #ifdef CONFIG_NVME_HWMON
256 	struct device *hwmon_device;
257 #endif
258 	struct cdev cdev;
259 	struct work_struct reset_work;
260 	struct work_struct delete_work;
261 	wait_queue_head_t state_wq;
262 
263 	struct nvme_subsystem *subsys;
264 	struct list_head subsys_entry;
265 
266 	struct opal_dev *opal_dev;
267 
268 	char name[12];
269 	u16 cntlid;
270 
271 	u32 ctrl_config;
272 	u16 mtfa;
273 	u32 queue_count;
274 
275 	u64 cap;
276 	u32 max_hw_sectors;
277 	u32 max_segments;
278 	u32 max_integrity_segments;
279 	u32 max_discard_sectors;
280 	u32 max_discard_segments;
281 	u32 max_zeroes_sectors;
282 #ifdef CONFIG_BLK_DEV_ZONED
283 	u32 max_zone_append;
284 #endif
285 	u16 crdt[3];
286 	u16 oncs;
287 	u32 dmrsl;
288 	u16 oacs;
289 	u16 sqsize;
290 	u32 max_namespaces;
291 	atomic_t abort_limit;
292 	u8 vwc;
293 	u32 vs;
294 	u32 sgls;
295 	u16 kas;
296 	u8 npss;
297 	u8 apsta;
298 	u16 wctemp;
299 	u16 cctemp;
300 	u32 oaes;
301 	u32 aen_result;
302 	u32 ctratt;
303 	unsigned int shutdown_timeout;
304 	unsigned int kato;
305 	bool subsystem;
306 	unsigned long quirks;
307 	struct nvme_id_power_state psd[32];
308 	struct nvme_effects_log *effects;
309 	struct xarray cels;
310 	struct work_struct scan_work;
311 	struct work_struct async_event_work;
312 	struct delayed_work ka_work;
313 	struct delayed_work failfast_work;
314 	struct nvme_command ka_cmd;
315 	struct work_struct fw_act_work;
316 	unsigned long events;
317 
318 #ifdef CONFIG_NVME_MULTIPATH
319 	/* asymmetric namespace access: */
320 	u8 anacap;
321 	u8 anatt;
322 	u32 anagrpmax;
323 	u32 nanagrpid;
324 	struct mutex ana_lock;
325 	struct nvme_ana_rsp_hdr *ana_log_buf;
326 	size_t ana_log_size;
327 	struct timer_list anatt_timer;
328 	struct work_struct ana_work;
329 #endif
330 
331 	/* Power saving configuration */
332 	u64 ps_max_latency_us;
333 	bool apst_enabled;
334 
335 	/* PCIe only: */
336 	u32 hmpre;
337 	u32 hmmin;
338 	u32 hmminds;
339 	u16 hmmaxd;
340 
341 	/* Fabrics only */
342 	u32 ioccsz;
343 	u32 iorcsz;
344 	u16 icdoff;
345 	u16 maxcmd;
346 	int nr_reconnects;
347 	unsigned long flags;
348 #define NVME_CTRL_FAILFAST_EXPIRED	0
349 #define NVME_CTRL_ADMIN_Q_STOPPED	1
350 	struct nvmf_ctrl_options *opts;
351 
352 	struct page *discard_page;
353 	unsigned long discard_page_busy;
354 
355 	struct nvme_fault_inject fault_inject;
356 
357 	enum nvme_ctrl_type cntrltype;
358 	enum nvme_dctype dctype;
359 };
360 
361 enum nvme_iopolicy {
362 	NVME_IOPOLICY_NUMA,
363 	NVME_IOPOLICY_RR,
364 };
365 
366 struct nvme_subsystem {
367 	int			instance;
368 	struct device		dev;
369 	/*
370 	 * Because we unregister the device on the last put we need
371 	 * a separate refcount.
372 	 */
373 	struct kref		ref;
374 	struct list_head	entry;
375 	struct mutex		lock;
376 	struct list_head	ctrls;
377 	struct list_head	nsheads;
378 	char			subnqn[NVMF_NQN_SIZE];
379 	char			serial[20];
380 	char			model[40];
381 	char			firmware_rev[8];
382 	u8			cmic;
383 	enum nvme_subsys_type	subtype;
384 	u16			vendor_id;
385 	u16			awupf;	/* 0's based awupf value. */
386 	struct ida		ns_ida;
387 #ifdef CONFIG_NVME_MULTIPATH
388 	enum nvme_iopolicy	iopolicy;
389 #endif
390 };
391 
392 /*
393  * Container structure for uniqueue namespace identifiers.
394  */
395 struct nvme_ns_ids {
396 	u8	eui64[8];
397 	u8	nguid[16];
398 	uuid_t	uuid;
399 	u8	csi;
400 };
401 
402 /*
403  * Anchor structure for namespaces.  There is one for each namespace in a
404  * NVMe subsystem that any of our controllers can see, and the namespace
405  * structure for each controller is chained of it.  For private namespaces
406  * there is a 1:1 relation to our namespace structures, that is ->list
407  * only ever has a single entry for private namespaces.
408  */
409 struct nvme_ns_head {
410 	struct list_head	list;
411 	struct srcu_struct      srcu;
412 	struct nvme_subsystem	*subsys;
413 	unsigned		ns_id;
414 	struct nvme_ns_ids	ids;
415 	struct list_head	entry;
416 	struct kref		ref;
417 	bool			shared;
418 	int			instance;
419 	struct nvme_effects_log *effects;
420 
421 	struct cdev		cdev;
422 	struct device		cdev_device;
423 
424 	struct gendisk		*disk;
425 #ifdef CONFIG_NVME_MULTIPATH
426 	struct bio_list		requeue_list;
427 	spinlock_t		requeue_lock;
428 	struct work_struct	requeue_work;
429 	struct mutex		lock;
430 	unsigned long		flags;
431 #define NVME_NSHEAD_DISK_LIVE	0
432 	struct nvme_ns __rcu	*current_path[];
433 #endif
434 };
435 
436 static inline bool nvme_ns_head_multipath(struct nvme_ns_head *head)
437 {
438 	return IS_ENABLED(CONFIG_NVME_MULTIPATH) && head->disk;
439 }
440 
441 enum nvme_ns_features {
442 	NVME_NS_EXT_LBAS = 1 << 0, /* support extended LBA format */
443 	NVME_NS_METADATA_SUPPORTED = 1 << 1, /* support getting generated md */
444 };
445 
446 struct nvme_ns {
447 	struct list_head list;
448 
449 	struct nvme_ctrl *ctrl;
450 	struct request_queue *queue;
451 	struct gendisk *disk;
452 #ifdef CONFIG_NVME_MULTIPATH
453 	enum nvme_ana_state ana_state;
454 	u32 ana_grpid;
455 #endif
456 	struct list_head siblings;
457 	struct kref kref;
458 	struct nvme_ns_head *head;
459 
460 	int lba_shift;
461 	u16 ms;
462 	u16 pi_size;
463 	u16 sgs;
464 	u32 sws;
465 	u8 pi_type;
466 	u8 guard_type;
467 #ifdef CONFIG_BLK_DEV_ZONED
468 	u64 zsze;
469 #endif
470 	unsigned long features;
471 	unsigned long flags;
472 #define NVME_NS_REMOVING	0
473 #define NVME_NS_DEAD     	1
474 #define NVME_NS_ANA_PENDING	2
475 #define NVME_NS_FORCE_RO	3
476 #define NVME_NS_READY		4
477 #define NVME_NS_STOPPED		5
478 
479 	struct cdev		cdev;
480 	struct device		cdev_device;
481 
482 	struct nvme_fault_inject fault_inject;
483 
484 };
485 
486 /* NVMe ns supports metadata actions by the controller (generate/strip) */
487 static inline bool nvme_ns_has_pi(struct nvme_ns *ns)
488 {
489 	return ns->pi_type && ns->ms == ns->pi_size;
490 }
491 
492 struct nvme_ctrl_ops {
493 	const char *name;
494 	struct module *module;
495 	unsigned int flags;
496 #define NVME_F_FABRICS			(1 << 0)
497 #define NVME_F_METADATA_SUPPORTED	(1 << 1)
498 #define NVME_F_PCI_P2PDMA		(1 << 2)
499 	int (*reg_read32)(struct nvme_ctrl *ctrl, u32 off, u32 *val);
500 	int (*reg_write32)(struct nvme_ctrl *ctrl, u32 off, u32 val);
501 	int (*reg_read64)(struct nvme_ctrl *ctrl, u32 off, u64 *val);
502 	void (*free_ctrl)(struct nvme_ctrl *ctrl);
503 	void (*submit_async_event)(struct nvme_ctrl *ctrl);
504 	void (*delete_ctrl)(struct nvme_ctrl *ctrl);
505 	int (*get_address)(struct nvme_ctrl *ctrl, char *buf, int size);
506 	void (*print_device_info)(struct nvme_ctrl *ctrl);
507 };
508 
509 /*
510  * nvme command_id is constructed as such:
511  * | xxxx | xxxxxxxxxxxx |
512  *   gen    request tag
513  */
514 #define nvme_genctr_mask(gen)			(gen & 0xf)
515 #define nvme_cid_install_genctr(gen)		(nvme_genctr_mask(gen) << 12)
516 #define nvme_genctr_from_cid(cid)		((cid & 0xf000) >> 12)
517 #define nvme_tag_from_cid(cid)			(cid & 0xfff)
518 
519 static inline u16 nvme_cid(struct request *rq)
520 {
521 	return nvme_cid_install_genctr(nvme_req(rq)->genctr) | rq->tag;
522 }
523 
524 static inline struct request *nvme_find_rq(struct blk_mq_tags *tags,
525 		u16 command_id)
526 {
527 	u8 genctr = nvme_genctr_from_cid(command_id);
528 	u16 tag = nvme_tag_from_cid(command_id);
529 	struct request *rq;
530 
531 	rq = blk_mq_tag_to_rq(tags, tag);
532 	if (unlikely(!rq)) {
533 		pr_err("could not locate request for tag %#x\n",
534 			tag);
535 		return NULL;
536 	}
537 	if (unlikely(nvme_genctr_mask(nvme_req(rq)->genctr) != genctr)) {
538 		dev_err(nvme_req(rq)->ctrl->device,
539 			"request %#x genctr mismatch (got %#x expected %#x)\n",
540 			tag, genctr, nvme_genctr_mask(nvme_req(rq)->genctr));
541 		return NULL;
542 	}
543 	return rq;
544 }
545 
546 static inline struct request *nvme_cid_to_rq(struct blk_mq_tags *tags,
547                 u16 command_id)
548 {
549 	return blk_mq_tag_to_rq(tags, nvme_tag_from_cid(command_id));
550 }
551 
552 /*
553  * Return the length of the string without the space padding
554  */
555 static inline int nvme_strlen(char *s, int len)
556 {
557 	while (s[len - 1] == ' ')
558 		len--;
559 	return len;
560 }
561 
562 static inline void nvme_print_device_info(struct nvme_ctrl *ctrl)
563 {
564 	struct nvme_subsystem *subsys = ctrl->subsys;
565 
566 	if (ctrl->ops->print_device_info) {
567 		ctrl->ops->print_device_info(ctrl);
568 		return;
569 	}
570 
571 	dev_err(ctrl->device,
572 		"VID:%04x model:%.*s firmware:%.*s\n", subsys->vendor_id,
573 		nvme_strlen(subsys->model, sizeof(subsys->model)),
574 		subsys->model, nvme_strlen(subsys->firmware_rev,
575 					   sizeof(subsys->firmware_rev)),
576 		subsys->firmware_rev);
577 }
578 
579 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
580 void nvme_fault_inject_init(struct nvme_fault_inject *fault_inj,
581 			    const char *dev_name);
582 void nvme_fault_inject_fini(struct nvme_fault_inject *fault_inject);
583 void nvme_should_fail(struct request *req);
584 #else
585 static inline void nvme_fault_inject_init(struct nvme_fault_inject *fault_inj,
586 					  const char *dev_name)
587 {
588 }
589 static inline void nvme_fault_inject_fini(struct nvme_fault_inject *fault_inj)
590 {
591 }
592 static inline void nvme_should_fail(struct request *req) {}
593 #endif
594 
595 static inline int nvme_reset_subsystem(struct nvme_ctrl *ctrl)
596 {
597 	if (!ctrl->subsystem)
598 		return -ENOTTY;
599 	return ctrl->ops->reg_write32(ctrl, NVME_REG_NSSR, 0x4E564D65);
600 }
601 
602 /*
603  * Convert a 512B sector number to a device logical block number.
604  */
605 static inline u64 nvme_sect_to_lba(struct nvme_ns *ns, sector_t sector)
606 {
607 	return sector >> (ns->lba_shift - SECTOR_SHIFT);
608 }
609 
610 /*
611  * Convert a device logical block number to a 512B sector number.
612  */
613 static inline sector_t nvme_lba_to_sect(struct nvme_ns *ns, u64 lba)
614 {
615 	return lba << (ns->lba_shift - SECTOR_SHIFT);
616 }
617 
618 /*
619  * Convert byte length to nvme's 0-based num dwords
620  */
621 static inline u32 nvme_bytes_to_numd(size_t len)
622 {
623 	return (len >> 2) - 1;
624 }
625 
626 static inline bool nvme_is_ana_error(u16 status)
627 {
628 	switch (status & 0x7ff) {
629 	case NVME_SC_ANA_TRANSITION:
630 	case NVME_SC_ANA_INACCESSIBLE:
631 	case NVME_SC_ANA_PERSISTENT_LOSS:
632 		return true;
633 	default:
634 		return false;
635 	}
636 }
637 
638 static inline bool nvme_is_path_error(u16 status)
639 {
640 	/* check for a status code type of 'path related status' */
641 	return (status & 0x700) == 0x300;
642 }
643 
644 /*
645  * Fill in the status and result information from the CQE, and then figure out
646  * if blk-mq will need to use IPI magic to complete the request, and if yes do
647  * so.  If not let the caller complete the request without an indirect function
648  * call.
649  */
650 static inline bool nvme_try_complete_req(struct request *req, __le16 status,
651 		union nvme_result result)
652 {
653 	struct nvme_request *rq = nvme_req(req);
654 	struct nvme_ctrl *ctrl = rq->ctrl;
655 
656 	if (!(ctrl->quirks & NVME_QUIRK_SKIP_CID_GEN))
657 		rq->genctr++;
658 
659 	rq->status = le16_to_cpu(status) >> 1;
660 	rq->result = result;
661 	/* inject error when permitted by fault injection framework */
662 	nvme_should_fail(req);
663 	if (unlikely(blk_should_fake_timeout(req->q)))
664 		return true;
665 	return blk_mq_complete_request_remote(req);
666 }
667 
668 static inline void nvme_get_ctrl(struct nvme_ctrl *ctrl)
669 {
670 	get_device(ctrl->device);
671 }
672 
673 static inline void nvme_put_ctrl(struct nvme_ctrl *ctrl)
674 {
675 	put_device(ctrl->device);
676 }
677 
678 static inline bool nvme_is_aen_req(u16 qid, __u16 command_id)
679 {
680 	return !qid &&
681 		nvme_tag_from_cid(command_id) >= NVME_AQ_BLK_MQ_DEPTH;
682 }
683 
684 void nvme_complete_rq(struct request *req);
685 void nvme_complete_batch_req(struct request *req);
686 
687 static __always_inline void nvme_complete_batch(struct io_comp_batch *iob,
688 						void (*fn)(struct request *rq))
689 {
690 	struct request *req;
691 
692 	rq_list_for_each(&iob->req_list, req) {
693 		fn(req);
694 		nvme_complete_batch_req(req);
695 	}
696 	blk_mq_end_request_batch(iob);
697 }
698 
699 blk_status_t nvme_host_path_error(struct request *req);
700 bool nvme_cancel_request(struct request *req, void *data, bool reserved);
701 void nvme_cancel_tagset(struct nvme_ctrl *ctrl);
702 void nvme_cancel_admin_tagset(struct nvme_ctrl *ctrl);
703 bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
704 		enum nvme_ctrl_state new_state);
705 bool nvme_wait_reset(struct nvme_ctrl *ctrl);
706 int nvme_disable_ctrl(struct nvme_ctrl *ctrl);
707 int nvme_enable_ctrl(struct nvme_ctrl *ctrl);
708 int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl);
709 int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
710 		const struct nvme_ctrl_ops *ops, unsigned long quirks);
711 void nvme_uninit_ctrl(struct nvme_ctrl *ctrl);
712 void nvme_start_ctrl(struct nvme_ctrl *ctrl);
713 void nvme_stop_ctrl(struct nvme_ctrl *ctrl);
714 int nvme_init_ctrl_finish(struct nvme_ctrl *ctrl);
715 
716 void nvme_remove_namespaces(struct nvme_ctrl *ctrl);
717 
718 int nvme_sec_submit(void *data, u16 spsp, u8 secp, void *buffer, size_t len,
719 		bool send);
720 
721 void nvme_complete_async_event(struct nvme_ctrl *ctrl, __le16 status,
722 		volatile union nvme_result *res);
723 
724 void nvme_stop_queues(struct nvme_ctrl *ctrl);
725 void nvme_start_queues(struct nvme_ctrl *ctrl);
726 void nvme_stop_admin_queue(struct nvme_ctrl *ctrl);
727 void nvme_start_admin_queue(struct nvme_ctrl *ctrl);
728 void nvme_kill_queues(struct nvme_ctrl *ctrl);
729 void nvme_sync_queues(struct nvme_ctrl *ctrl);
730 void nvme_sync_io_queues(struct nvme_ctrl *ctrl);
731 void nvme_unfreeze(struct nvme_ctrl *ctrl);
732 void nvme_wait_freeze(struct nvme_ctrl *ctrl);
733 int nvme_wait_freeze_timeout(struct nvme_ctrl *ctrl, long timeout);
734 void nvme_start_freeze(struct nvme_ctrl *ctrl);
735 
736 static inline unsigned int nvme_req_op(struct nvme_command *cmd)
737 {
738 	return nvme_is_write(cmd) ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN;
739 }
740 
741 #define NVME_QID_ANY -1
742 void nvme_init_request(struct request *req, struct nvme_command *cmd);
743 void nvme_cleanup_cmd(struct request *req);
744 blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req);
745 blk_status_t nvme_fail_nonready_command(struct nvme_ctrl *ctrl,
746 		struct request *req);
747 bool __nvme_check_ready(struct nvme_ctrl *ctrl, struct request *rq,
748 		bool queue_live);
749 
750 static inline bool nvme_check_ready(struct nvme_ctrl *ctrl, struct request *rq,
751 		bool queue_live)
752 {
753 	if (likely(ctrl->state == NVME_CTRL_LIVE))
754 		return true;
755 	if (ctrl->ops->flags & NVME_F_FABRICS &&
756 	    ctrl->state == NVME_CTRL_DELETING)
757 		return queue_live;
758 	return __nvme_check_ready(ctrl, rq, queue_live);
759 }
760 
761 /*
762  * NSID shall be unique for all shared namespaces, or if at least one of the
763  * following conditions is met:
764  *   1. Namespace Management is supported by the controller
765  *   2. ANA is supported by the controller
766  *   3. NVM Set are supported by the controller
767  *
768  * In other case, private namespace are not required to report a unique NSID.
769  */
770 static inline bool nvme_is_unique_nsid(struct nvme_ctrl *ctrl,
771 		struct nvme_ns_head *head)
772 {
773 	return head->shared ||
774 		(ctrl->oacs & NVME_CTRL_OACS_NS_MNGT_SUPP) ||
775 		(ctrl->subsys->cmic & NVME_CTRL_CMIC_ANA) ||
776 		(ctrl->ctratt & NVME_CTRL_CTRATT_NVM_SETS);
777 }
778 
779 int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
780 		void *buf, unsigned bufflen);
781 int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
782 		union nvme_result *result, void *buffer, unsigned bufflen,
783 		unsigned timeout, int qid, int at_head,
784 		blk_mq_req_flags_t flags);
785 int nvme_set_features(struct nvme_ctrl *dev, unsigned int fid,
786 		      unsigned int dword11, void *buffer, size_t buflen,
787 		      u32 *result);
788 int nvme_get_features(struct nvme_ctrl *dev, unsigned int fid,
789 		      unsigned int dword11, void *buffer, size_t buflen,
790 		      u32 *result);
791 int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count);
792 void nvme_stop_keep_alive(struct nvme_ctrl *ctrl);
793 int nvme_reset_ctrl(struct nvme_ctrl *ctrl);
794 int nvme_reset_ctrl_sync(struct nvme_ctrl *ctrl);
795 int nvme_try_sched_reset(struct nvme_ctrl *ctrl);
796 int nvme_delete_ctrl(struct nvme_ctrl *ctrl);
797 void nvme_queue_scan(struct nvme_ctrl *ctrl);
798 int nvme_get_log(struct nvme_ctrl *ctrl, u32 nsid, u8 log_page, u8 lsp, u8 csi,
799 		void *log, size_t size, u64 offset);
800 bool nvme_tryget_ns_head(struct nvme_ns_head *head);
801 void nvme_put_ns_head(struct nvme_ns_head *head);
802 int nvme_cdev_add(struct cdev *cdev, struct device *cdev_device,
803 		const struct file_operations *fops, struct module *owner);
804 void nvme_cdev_del(struct cdev *cdev, struct device *cdev_device);
805 int nvme_ioctl(struct block_device *bdev, fmode_t mode,
806 		unsigned int cmd, unsigned long arg);
807 long nvme_ns_chr_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
808 int nvme_ns_head_ioctl(struct block_device *bdev, fmode_t mode,
809 		unsigned int cmd, unsigned long arg);
810 long nvme_ns_head_chr_ioctl(struct file *file, unsigned int cmd,
811 		unsigned long arg);
812 long nvme_dev_ioctl(struct file *file, unsigned int cmd,
813 		unsigned long arg);
814 int nvme_ns_chr_uring_cmd(struct io_uring_cmd *ioucmd,
815 		unsigned int issue_flags);
816 int nvme_ns_head_chr_uring_cmd(struct io_uring_cmd *ioucmd,
817 		unsigned int issue_flags);
818 int nvme_getgeo(struct block_device *bdev, struct hd_geometry *geo);
819 int nvme_dev_uring_cmd(struct io_uring_cmd *ioucmd, unsigned int issue_flags);
820 
821 extern const struct attribute_group *nvme_ns_id_attr_groups[];
822 extern const struct pr_ops nvme_pr_ops;
823 extern const struct block_device_operations nvme_ns_head_ops;
824 
825 struct nvme_ns *nvme_find_path(struct nvme_ns_head *head);
826 #ifdef CONFIG_NVME_MULTIPATH
827 static inline bool nvme_ctrl_use_ana(struct nvme_ctrl *ctrl)
828 {
829 	return ctrl->ana_log_buf != NULL;
830 }
831 
832 void nvme_mpath_unfreeze(struct nvme_subsystem *subsys);
833 void nvme_mpath_wait_freeze(struct nvme_subsystem *subsys);
834 void nvme_mpath_start_freeze(struct nvme_subsystem *subsys);
835 void nvme_mpath_default_iopolicy(struct nvme_subsystem *subsys);
836 void nvme_failover_req(struct request *req);
837 void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl);
838 int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl,struct nvme_ns_head *head);
839 void nvme_mpath_add_disk(struct nvme_ns *ns, struct nvme_id_ns *id);
840 void nvme_mpath_remove_disk(struct nvme_ns_head *head);
841 int nvme_mpath_init_identify(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id);
842 void nvme_mpath_init_ctrl(struct nvme_ctrl *ctrl);
843 void nvme_mpath_update(struct nvme_ctrl *ctrl);
844 void nvme_mpath_uninit(struct nvme_ctrl *ctrl);
845 void nvme_mpath_stop(struct nvme_ctrl *ctrl);
846 bool nvme_mpath_clear_current_path(struct nvme_ns *ns);
847 void nvme_mpath_revalidate_paths(struct nvme_ns *ns);
848 void nvme_mpath_clear_ctrl_paths(struct nvme_ctrl *ctrl);
849 void nvme_mpath_shutdown_disk(struct nvme_ns_head *head);
850 
851 static inline void nvme_trace_bio_complete(struct request *req)
852 {
853 	struct nvme_ns *ns = req->q->queuedata;
854 
855 	if (req->cmd_flags & REQ_NVME_MPATH)
856 		trace_block_bio_complete(ns->head->disk->queue, req->bio);
857 }
858 
859 extern bool multipath;
860 extern struct device_attribute dev_attr_ana_grpid;
861 extern struct device_attribute dev_attr_ana_state;
862 extern struct device_attribute subsys_attr_iopolicy;
863 
864 #else
865 #define multipath false
866 static inline bool nvme_ctrl_use_ana(struct nvme_ctrl *ctrl)
867 {
868 	return false;
869 }
870 static inline void nvme_failover_req(struct request *req)
871 {
872 }
873 static inline void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl)
874 {
875 }
876 static inline int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl,
877 		struct nvme_ns_head *head)
878 {
879 	return 0;
880 }
881 static inline void nvme_mpath_add_disk(struct nvme_ns *ns,
882 		struct nvme_id_ns *id)
883 {
884 }
885 static inline void nvme_mpath_remove_disk(struct nvme_ns_head *head)
886 {
887 }
888 static inline bool nvme_mpath_clear_current_path(struct nvme_ns *ns)
889 {
890 	return false;
891 }
892 static inline void nvme_mpath_revalidate_paths(struct nvme_ns *ns)
893 {
894 }
895 static inline void nvme_mpath_clear_ctrl_paths(struct nvme_ctrl *ctrl)
896 {
897 }
898 static inline void nvme_mpath_shutdown_disk(struct nvme_ns_head *head)
899 {
900 }
901 static inline void nvme_trace_bio_complete(struct request *req)
902 {
903 }
904 static inline void nvme_mpath_init_ctrl(struct nvme_ctrl *ctrl)
905 {
906 }
907 static inline int nvme_mpath_init_identify(struct nvme_ctrl *ctrl,
908 		struct nvme_id_ctrl *id)
909 {
910 	if (ctrl->subsys->cmic & NVME_CTRL_CMIC_ANA)
911 		dev_warn(ctrl->device,
912 "Please enable CONFIG_NVME_MULTIPATH for full support of multi-port devices.\n");
913 	return 0;
914 }
915 static inline void nvme_mpath_update(struct nvme_ctrl *ctrl)
916 {
917 }
918 static inline void nvme_mpath_uninit(struct nvme_ctrl *ctrl)
919 {
920 }
921 static inline void nvme_mpath_stop(struct nvme_ctrl *ctrl)
922 {
923 }
924 static inline void nvme_mpath_unfreeze(struct nvme_subsystem *subsys)
925 {
926 }
927 static inline void nvme_mpath_wait_freeze(struct nvme_subsystem *subsys)
928 {
929 }
930 static inline void nvme_mpath_start_freeze(struct nvme_subsystem *subsys)
931 {
932 }
933 static inline void nvme_mpath_default_iopolicy(struct nvme_subsystem *subsys)
934 {
935 }
936 #endif /* CONFIG_NVME_MULTIPATH */
937 
938 int nvme_revalidate_zones(struct nvme_ns *ns);
939 int nvme_ns_report_zones(struct nvme_ns *ns, sector_t sector,
940 		unsigned int nr_zones, report_zones_cb cb, void *data);
941 #ifdef CONFIG_BLK_DEV_ZONED
942 int nvme_update_zone_info(struct nvme_ns *ns, unsigned lbaf);
943 blk_status_t nvme_setup_zone_mgmt_send(struct nvme_ns *ns, struct request *req,
944 				       struct nvme_command *cmnd,
945 				       enum nvme_zone_mgmt_action action);
946 #else
947 static inline blk_status_t nvme_setup_zone_mgmt_send(struct nvme_ns *ns,
948 		struct request *req, struct nvme_command *cmnd,
949 		enum nvme_zone_mgmt_action action)
950 {
951 	return BLK_STS_NOTSUPP;
952 }
953 
954 static inline int nvme_update_zone_info(struct nvme_ns *ns, unsigned lbaf)
955 {
956 	dev_warn(ns->ctrl->device,
957 		 "Please enable CONFIG_BLK_DEV_ZONED to support ZNS devices\n");
958 	return -EPROTONOSUPPORT;
959 }
960 #endif
961 
962 static inline int nvme_ctrl_init_connect_q(struct nvme_ctrl *ctrl)
963 {
964 	ctrl->connect_q = blk_mq_init_queue(ctrl->tagset);
965 	if (IS_ERR(ctrl->connect_q))
966 		return PTR_ERR(ctrl->connect_q);
967 	return 0;
968 }
969 
970 static inline struct nvme_ns *nvme_get_ns_from_dev(struct device *dev)
971 {
972 	return dev_to_disk(dev)->private_data;
973 }
974 
975 #ifdef CONFIG_NVME_HWMON
976 int nvme_hwmon_init(struct nvme_ctrl *ctrl);
977 void nvme_hwmon_exit(struct nvme_ctrl *ctrl);
978 #else
979 static inline int nvme_hwmon_init(struct nvme_ctrl *ctrl)
980 {
981 	return 0;
982 }
983 
984 static inline void nvme_hwmon_exit(struct nvme_ctrl *ctrl)
985 {
986 }
987 #endif
988 
989 static inline bool nvme_ctrl_sgl_supported(struct nvme_ctrl *ctrl)
990 {
991 	return ctrl->sgls & ((1 << 0) | (1 << 1));
992 }
993 
994 u32 nvme_command_effects(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
995 			 u8 opcode);
996 int nvme_execute_passthru_rq(struct request *rq);
997 struct nvme_ctrl *nvme_ctrl_from_file(struct file *file);
998 struct nvme_ns *nvme_find_get_ns(struct nvme_ctrl *ctrl, unsigned nsid);
999 void nvme_put_ns(struct nvme_ns *ns);
1000 
1001 static inline bool nvme_multi_css(struct nvme_ctrl *ctrl)
1002 {
1003 	return (ctrl->ctrl_config & NVME_CC_CSS_MASK) == NVME_CC_CSS_CSI;
1004 }
1005 
1006 #ifdef CONFIG_NVME_VERBOSE_ERRORS
1007 const unsigned char *nvme_get_error_status_str(u16 status);
1008 const unsigned char *nvme_get_opcode_str(u8 opcode);
1009 const unsigned char *nvme_get_admin_opcode_str(u8 opcode);
1010 #else /* CONFIG_NVME_VERBOSE_ERRORS */
1011 static inline const unsigned char *nvme_get_error_status_str(u16 status)
1012 {
1013 	return "I/O Error";
1014 }
1015 static inline const unsigned char *nvme_get_opcode_str(u8 opcode)
1016 {
1017 	return "I/O Cmd";
1018 }
1019 static inline const unsigned char *nvme_get_admin_opcode_str(u8 opcode)
1020 {
1021 	return "Admin Cmd";
1022 }
1023 #endif /* CONFIG_NVME_VERBOSE_ERRORS */
1024 
1025 #endif /* _NVME_H */
1026