[mirror_ubuntu-bionic-kernel.git] / drivers / nvme / host / nvme.h

/*
 * Copyright (c) 2011-2014, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 */

#ifndef _NVME_H
#define _NVME_H

#include <linux/nvme.h>
#include <linux/pci.h>
#include <linux/kref.h>
#include <linux/blk-mq.h>
#include <linux/lightnvm.h>
#include <linux/sed-opal.h>

enum {
	/*
	 * Driver internal status code for commands that were cancelled due
	 * to timeouts or controller shutdown.  The value is negative so
	 * that it a) doesn't overlap with the unsigned hardware error codes,
	 * and b) can easily be tested for.
	 */
	NVME_SC_CANCELLED		= -EINTR,
};

extern unsigned char nvme_io_timeout;
#define NVME_IO_TIMEOUT	(nvme_io_timeout * HZ)

extern unsigned char admin_timeout;
#define ADMIN_TIMEOUT	(admin_timeout * HZ)

extern unsigned char shutdown_timeout;
#define SHUTDOWN_TIMEOUT	(shutdown_timeout * HZ)

#define NVME_DEFAULT_KATO	5
#define NVME_KATO_GRACE		10

enum {
	NVME_NS_LBA		= 0,
	NVME_NS_LIGHTNVM	= 1,
};

/*
 * List of workarounds for devices that required behavior not specified in
 * the standard.
 */
enum nvme_quirks {
	/*
	 * Prefers I/O aligned to a stripe size specified in a vendor
	 * specific Identify field.
	 */
	NVME_QUIRK_STRIPE_SIZE			= (1 << 0),

	/*
	 * The controller doesn't handle Identify value others than 0 or 1
	 * correctly.
	 */
	NVME_QUIRK_IDENTIFY_CNS			= (1 << 1),

	/*
	 * The controller deterministically returns O's on reads to discarded
	 * logical blocks.
	 */
	NVME_QUIRK_DISCARD_ZEROES		= (1 << 2),

	/*
	 * The controller needs a delay before starts checking the device
	 * readiness, which is done by reading the NVME_CSTS_RDY bit.
	 */
	NVME_QUIRK_DELAY_BEFORE_CHK_RDY		= (1 << 3),

	/*
	 * APST should not be used.
	 */
	NVME_QUIRK_NO_APST			= (1 << 4),
};

/*
 * Common request structure for NVMe passthrough.  All drivers must have
 * this structure as the first member of their request-private data.
 */
struct nvme_request {
	struct nvme_command	*cmd;
	union nvme_result	result;
};

static inline struct nvme_request *nvme_req(struct request *req)
{
	return blk_mq_rq_to_pdu(req);
}

/* The below value is the specific amount of delay needed before checking
 * readiness in case of the PCI_DEVICE(0x1c58, 0x0003), which needs the
 * NVME_QUIRK_DELAY_BEFORE_CHK_RDY quirk enabled. The value (in ms) was
 * found empirically.
 */
#define NVME_QUIRK_DELAY_AMOUNT		2000

enum nvme_ctrl_state {
	NVME_CTRL_NEW,
	NVME_CTRL_LIVE,
	NVME_CTRL_RESETTING,
	NVME_CTRL_RECONNECTING,
	NVME_CTRL_DELETING,
	NVME_CTRL_DEAD,
};

struct nvme_ctrl {
	enum nvme_ctrl_state state;
	bool identified;
	spinlock_t lock;
	const struct nvme_ctrl_ops *ops;
	struct request_queue *admin_q;
	struct request_queue *connect_q;
	struct device *dev;
	struct kref kref;
	int instance;
	struct blk_mq_tag_set *tagset;
	struct list_head namespaces;
	struct mutex namespaces_mutex;
	struct device *device;	/* char device */
	struct list_head node;
	struct ida ns_ida;

	struct opal_dev *opal_dev;

	char name[12];
	char serial[20];
	char model[40];
	char firmware_rev[8];
	u16 cntlid;

	u32 ctrl_config;

	u32 page_size;
	u32 max_hw_sectors;
	u16 oncs;
	u16 vid;
	u16 oacs;
	atomic_t abort_limit;
	u8 event_limit;
	u8 vwc;
	u32 vs;
	u32 sgls;
	u16 kas;
	u8 npss;
	u8 apsta;
	unsigned int kato;
	bool subsystem;
	unsigned long quirks;
	struct nvme_id_power_state psd[32];
	struct work_struct scan_work;
	struct work_struct async_event_work;
	struct delayed_work ka_work;

	/* Power saving configuration */
	u64 ps_max_latency_us;

	/* Fabrics only */
	u16 sqsize;
	u32 ioccsz;
	u32 iorcsz;
	u16 icdoff;
	u16 maxcmd;
	struct nvmf_ctrl_options *opts;
};

/*
 * An NVM Express namespace is equivalent to a SCSI LUN
 */
struct nvme_ns {
	struct list_head list;

	struct nvme_ctrl *ctrl;
	struct request_queue *queue;
	struct gendisk *disk;
	struct nvm_dev *ndev;
	struct kref kref;
	int instance;

	u8 eui[8];
	u8 uuid[16];

	unsigned ns_id;
	int lba_shift;
	u16 ms;
	bool ext;
	u8 pi_type;
	unsigned long flags;

#define NVME_NS_REMOVING 0
#define NVME_NS_DEAD     1

	u64 mode_select_num_blocks;
	u32 mode_select_block_len;
};

struct nvme_ctrl_ops {
	const char *name;
	struct module *module;
	bool is_fabrics;
	int (*reg_read32)(struct nvme_ctrl *ctrl, u32 off, u32 *val);
	int (*reg_write32)(struct nvme_ctrl *ctrl, u32 off, u32 val);
	int (*reg_read64)(struct nvme_ctrl *ctrl, u32 off, u64 *val);
	int (*reset_ctrl)(struct nvme_ctrl *ctrl);
	void (*free_ctrl)(struct nvme_ctrl *ctrl);
	void (*submit_async_event)(struct nvme_ctrl *ctrl, int aer_idx);
	int (*delete_ctrl)(struct nvme_ctrl *ctrl);
	const char *(*get_subsysnqn)(struct nvme_ctrl *ctrl);
	int (*get_address)(struct nvme_ctrl *ctrl, char *buf, int size);
};

static inline bool nvme_ctrl_ready(struct nvme_ctrl *ctrl)
{
	u32 val = 0;

	if (ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &val))
		return false;
	return val & NVME_CSTS_RDY;
}

static inline int nvme_reset_subsystem(struct nvme_ctrl *ctrl)
{
	if (!ctrl->subsystem)
		return -ENOTTY;
	return ctrl->ops->reg_write32(ctrl, NVME_REG_NSSR, 0x4E564D65);
}

static inline u64 nvme_block_nr(struct nvme_ns *ns, sector_t sector)
{
	return (sector >> (ns->lba_shift - 9));
}

static inline void nvme_cleanup_cmd(struct request *req)
{
	if (req->rq_flags & RQF_SPECIAL_PAYLOAD) {
		kfree(page_address(req->special_vec.bv_page) +
		      req->special_vec.bv_offset);
	}
}

static inline int nvme_error_status(u16 status)
{
	switch (status & 0x7ff) {
	case NVME_SC_SUCCESS:
		return 0;
	case NVME_SC_CAP_EXCEEDED:
		return -ENOSPC;
	default:
		return -EIO;
	}
}

void nvme_complete_rq(struct request *req);
void nvme_cancel_request(struct request *req, void *data, bool reserved);
bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
		enum nvme_ctrl_state new_state);
int nvme_disable_ctrl(struct nvme_ctrl *ctrl, u64 cap);
int nvme_enable_ctrl(struct nvme_ctrl *ctrl, u64 cap);
int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl);
int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
		const struct nvme_ctrl_ops *ops, unsigned long quirks);
void nvme_uninit_ctrl(struct nvme_ctrl *ctrl);
void nvme_put_ctrl(struct nvme_ctrl *ctrl);
int nvme_init_identify(struct nvme_ctrl *ctrl);

void nvme_queue_scan(struct nvme_ctrl *ctrl);
void nvme_remove_namespaces(struct nvme_ctrl *ctrl);

int nvme_sec_submit(void *data, u16 spsp, u8 secp, void *buffer, size_t len,
		bool send);

#define NVME_NR_AERS	1
void nvme_complete_async_event(struct nvme_ctrl *ctrl, __le16 status,
		union nvme_result *res);
void nvme_queue_async_events(struct nvme_ctrl *ctrl);

void nvme_stop_queues(struct nvme_ctrl *ctrl);
void nvme_start_queues(struct nvme_ctrl *ctrl);
void nvme_kill_queues(struct nvme_ctrl *ctrl);
void nvme_unfreeze(struct nvme_ctrl *ctrl);
void nvme_wait_freeze(struct nvme_ctrl *ctrl);
void nvme_wait_freeze_timeout(struct nvme_ctrl *ctrl, long timeout);
void nvme_start_freeze(struct nvme_ctrl *ctrl);

#define NVME_QID_ANY -1
struct request *nvme_alloc_request(struct request_queue *q,
		struct nvme_command *cmd, unsigned int flags, int qid);
int nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
		struct nvme_command *cmd);
int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
		void *buf, unsigned bufflen);
int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
		union nvme_result *result, void *buffer, unsigned bufflen,
		unsigned timeout, int qid, int at_head, int flags);
int nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd,
		void __user *ubuffer, unsigned bufflen, u32 *result,
		unsigned timeout);
int __nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd,
		void __user *ubuffer, unsigned bufflen,
		void __user *meta_buffer, unsigned meta_len, u32 meta_seed,
		u32 *result, unsigned timeout);
int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id);
int nvme_identify_ns(struct nvme_ctrl *dev, unsigned nsid,
		struct nvme_id_ns **id);
int nvme_get_log_page(struct nvme_ctrl *dev, struct nvme_smart_log **log);
int nvme_get_features(struct nvme_ctrl *dev, unsigned fid, unsigned nsid,
		      void *buffer, size_t buflen, u32 *result);
int nvme_set_features(struct nvme_ctrl *dev, unsigned fid, unsigned dword11,
		      void *buffer, size_t buflen, u32 *result);
int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count);
void nvme_start_keep_alive(struct nvme_ctrl *ctrl);
void nvme_stop_keep_alive(struct nvme_ctrl *ctrl);

struct sg_io_hdr;

int nvme_sg_io(struct nvme_ns *ns, struct sg_io_hdr __user *u_hdr);
int nvme_sg_io32(struct nvme_ns *ns, unsigned long arg);
int nvme_sg_get_version_num(int __user *ip);

#ifdef CONFIG_NVM
int nvme_nvm_ns_supported(struct nvme_ns *ns, struct nvme_id_ns *id);
int nvme_nvm_register(struct nvme_ns *ns, char *disk_name, int node);
void nvme_nvm_unregister(struct nvme_ns *ns);
int nvme_nvm_register_sysfs(struct nvme_ns *ns);
void nvme_nvm_unregister_sysfs(struct nvme_ns *ns);
int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd, unsigned long arg);
#else
static inline int nvme_nvm_register(struct nvme_ns *ns, char *disk_name,
				    int node)
{
	return 0;
}

static inline void nvme_nvm_unregister(struct nvme_ns *ns) {};
static inline int nvme_nvm_register_sysfs(struct nvme_ns *ns)
{
	return 0;
}
static inline void nvme_nvm_unregister_sysfs(struct nvme_ns *ns) {};
static inline int nvme_nvm_ns_supported(struct nvme_ns *ns, struct nvme_id_ns *id)
{
	return 0;
}
static inline int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd,
							unsigned long arg)
{
	return -ENOTTY;
}
#endif /* CONFIG_NVM */

static inline struct nvme_ns *nvme_get_ns_from_dev(struct device *dev)
{
	return dev_to_disk(dev)->private_data;
}

int __init nvme_core_init(void);
void nvme_core_exit(void);

#endif /* _NVME_H */
Commit	Line	Data
	1	/*
	2	* Copyright (c) 2011-2014, Intel Corporation.
	3	*
	4	* This program is free software; you can redistribute it and/or modify it
	5	* under the terms and conditions of the GNU General Public License,
	6	* version 2, as published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope it will be useful, but WITHOUT
	9	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	10	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	11	* more details.
	12	*/
	13
	14	#ifndef _NVME_H
	15	#define _NVME_H
	16
	17	#include <linux/nvme.h>
	18	#include <linux/pci.h>
	19	#include <linux/kref.h>
	20	#include <linux/blk-mq.h>
	21	#include <linux/lightnvm.h>
	22	#include <linux/sed-opal.h>
	23
	24	enum {
	25	/*
	26	* Driver internal status code for commands that were cancelled due
	27	* to timeouts or controller shutdown. The value is negative so
	28	* that it a) doesn't overlap with the unsigned hardware error codes,
	29	* and b) can easily be tested for.
	30	*/
	31	NVME_SC_CANCELLED = -EINTR,
	32	};
	33
	34	extern unsigned char nvme_io_timeout;
	35	#define NVME_IO_TIMEOUT (nvme_io_timeout * HZ)
	36
	37	extern unsigned char admin_timeout;
	38	#define ADMIN_TIMEOUT (admin_timeout * HZ)
	39
	40	extern unsigned char shutdown_timeout;
	41	#define SHUTDOWN_TIMEOUT (shutdown_timeout * HZ)
	42
	43	#define NVME_DEFAULT_KATO 5
	44	#define NVME_KATO_GRACE 10
	45
	46	enum {
	47	NVME_NS_LBA = 0,
	48	NVME_NS_LIGHTNVM = 1,
	49	};
	50
	51	/*
	52	* List of workarounds for devices that required behavior not specified in
	53	* the standard.
	54	*/
	55	enum nvme_quirks {
	56	/*
	57	* Prefers I/O aligned to a stripe size specified in a vendor
	58	* specific Identify field.
	59	*/
	60	NVME_QUIRK_STRIPE_SIZE = (1 << 0),
	61
	62	/*
	63	* The controller doesn't handle Identify value others than 0 or 1
	64	* correctly.
	65	*/
	66	NVME_QUIRK_IDENTIFY_CNS = (1 << 1),
	67
	68	/*
	69	* The controller deterministically returns O's on reads to discarded
	70	* logical blocks.
	71	*/
	72	NVME_QUIRK_DISCARD_ZEROES = (1 << 2),
	73
	74	/*
	75	* The controller needs a delay before starts checking the device
	76	* readiness, which is done by reading the NVME_CSTS_RDY bit.
	77	*/
	78	NVME_QUIRK_DELAY_BEFORE_CHK_RDY = (1 << 3),
	79
	80	/*
	81	* APST should not be used.
	82	*/
	83	NVME_QUIRK_NO_APST = (1 << 4),
	84	};
	85
	86	/*
	87	* Common request structure for NVMe passthrough. All drivers must have
	88	* this structure as the first member of their request-private data.
	89	*/
	90	struct nvme_request {
	91	struct nvme_command *cmd;
	92	union nvme_result result;
	93	};
	94
	95	static inline struct nvme_request nvme_req(struct request req)
	96	{
	97	return blk_mq_rq_to_pdu(req);
	98	}
	99
	100	/* The below value is the specific amount of delay needed before checking
	101	* readiness in case of the PCI_DEVICE(0x1c58, 0x0003), which needs the
	102	* NVME_QUIRK_DELAY_BEFORE_CHK_RDY quirk enabled. The value (in ms) was
	103	* found empirically.
	104	*/
	105	#define NVME_QUIRK_DELAY_AMOUNT 2000
	106
	107	enum nvme_ctrl_state {
	108	NVME_CTRL_NEW,
	109	NVME_CTRL_LIVE,
	110	NVME_CTRL_RESETTING,
	111	NVME_CTRL_RECONNECTING,
	112	NVME_CTRL_DELETING,
	113	NVME_CTRL_DEAD,
	114	};
	115
	116	struct nvme_ctrl {
	117	enum nvme_ctrl_state state;
	118	bool identified;
	119	spinlock_t lock;
	120	const struct nvme_ctrl_ops *ops;
	121	struct request_queue *admin_q;
	122	struct request_queue *connect_q;
	123	struct device *dev;
	124	struct kref kref;
	125	int instance;
	126	struct blk_mq_tag_set *tagset;
	127	struct list_head namespaces;
	128	struct mutex namespaces_mutex;
	129	struct device device; / char device */
	130	struct list_head node;
	131	struct ida ns_ida;
	132
	133	struct opal_dev *opal_dev;
	134
	135	char name[12];
	136	char serial[20];
	137	char model[40];
	138	char firmware_rev[8];
	139	u16 cntlid;
	140
	141	u32 ctrl_config;
	142
	143	u32 page_size;
	144	u32 max_hw_sectors;
	145	u16 oncs;
	146	u16 vid;
	147	u16 oacs;
	148	atomic_t abort_limit;
	149	u8 event_limit;
	150	u8 vwc;
	151	u32 vs;
	152	u32 sgls;
	153	u16 kas;
	154	u8 npss;
	155	u8 apsta;
	156	unsigned int kato;
	157	bool subsystem;
	158	unsigned long quirks;
	159	struct nvme_id_power_state psd[32];
	160	struct work_struct scan_work;
	161	struct work_struct async_event_work;
	162	struct delayed_work ka_work;
	163
	164	/* Power saving configuration */
	165	u64 ps_max_latency_us;
	166
	167	/* Fabrics only */
	168	u16 sqsize;
	169	u32 ioccsz;
	170	u32 iorcsz;
	171	u16 icdoff;
	172	u16 maxcmd;
	173	struct nvmf_ctrl_options *opts;
	174	};
	175
	176	/*
	177	* An NVM Express namespace is equivalent to a SCSI LUN
	178	*/
	179	struct nvme_ns {
	180	struct list_head list;
	181
	182	struct nvme_ctrl *ctrl;
	183	struct request_queue *queue;
	184	struct gendisk *disk;
	185	struct nvm_dev *ndev;
	186	struct kref kref;
	187	int instance;
	188
	189	u8 eui[8];
	190	u8 uuid[16];
	191
	192	unsigned ns_id;
	193	int lba_shift;
	194	u16 ms;
	195	bool ext;
	196	u8 pi_type;
	197	unsigned long flags;
	198
	199	#define NVME_NS_REMOVING 0
	200	#define NVME_NS_DEAD 1
	201
	202	u64 mode_select_num_blocks;
	203	u32 mode_select_block_len;
	204	};
	205
	206	struct nvme_ctrl_ops {
	207	const char *name;
	208	struct module *module;
	209	bool is_fabrics;
	210	int (reg_read32)(struct nvme_ctrl ctrl, u32 off, u32 *val);
	211	int (reg_write32)(struct nvme_ctrl ctrl, u32 off, u32 val);
	212	int (reg_read64)(struct nvme_ctrl ctrl, u32 off, u64 *val);
	213	int (reset_ctrl)(struct nvme_ctrl ctrl);
	214	void (free_ctrl)(struct nvme_ctrl ctrl);
	215	void (submit_async_event)(struct nvme_ctrl ctrl, int aer_idx);
	216	int (delete_ctrl)(struct nvme_ctrl ctrl);
	217	const char (get_subsysnqn)(struct nvme_ctrl *ctrl);
	218	int (get_address)(struct nvme_ctrl ctrl, char *buf, int size);
	219	};
	220
	221	static inline bool nvme_ctrl_ready(struct nvme_ctrl *ctrl)
	222	{
	223	u32 val = 0;
	224
	225	if (ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &val))
	226	return false;
	227	return val & NVME_CSTS_RDY;
	228	}
	229
	230	static inline int nvme_reset_subsystem(struct nvme_ctrl *ctrl)
	231	{
	232	if (!ctrl->subsystem)
	233	return -ENOTTY;
	234	return ctrl->ops->reg_write32(ctrl, NVME_REG_NSSR, 0x4E564D65);
	235	}
	236
	237	static inline u64 nvme_block_nr(struct nvme_ns *ns, sector_t sector)
	238	{
	239	return (sector >> (ns->lba_shift - 9));
	240	}
	241
	242	static inline void nvme_cleanup_cmd(struct request *req)
	243	{
	244	if (req->rq_flags & RQF_SPECIAL_PAYLOAD) {
	245	kfree(page_address(req->special_vec.bv_page) +
	246	req->special_vec.bv_offset);
	247	}
	248	}
	249
	250	static inline int nvme_error_status(u16 status)
	251	{
	252	switch (status & 0x7ff) {
	253	case NVME_SC_SUCCESS:
	254	return 0;
	255	case NVME_SC_CAP_EXCEEDED:
	256	return -ENOSPC;
	257	default:
	258	return -EIO;
	259	}
	260	}
	261
	262	void nvme_complete_rq(struct request *req);
	263	void nvme_cancel_request(struct request req, void data, bool reserved);
	264	bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
	265	enum nvme_ctrl_state new_state);
	266	int nvme_disable_ctrl(struct nvme_ctrl *ctrl, u64 cap);
	267	int nvme_enable_ctrl(struct nvme_ctrl *ctrl, u64 cap);
	268	int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl);
	269	int nvme_init_ctrl(struct nvme_ctrl ctrl, struct device dev,
	270	const struct nvme_ctrl_ops *ops, unsigned long quirks);
	271	void nvme_uninit_ctrl(struct nvme_ctrl *ctrl);
	272	void nvme_put_ctrl(struct nvme_ctrl *ctrl);
	273	int nvme_init_identify(struct nvme_ctrl *ctrl);
	274
	275	void nvme_queue_scan(struct nvme_ctrl *ctrl);
	276	void nvme_remove_namespaces(struct nvme_ctrl *ctrl);
	277
	278	int nvme_sec_submit(void data, u16 spsp, u8 secp, void buffer, size_t len,
	279	bool send);
	280
	281	#define NVME_NR_AERS 1
	282	void nvme_complete_async_event(struct nvme_ctrl *ctrl, __le16 status,
	283	union nvme_result *res);
	284	void nvme_queue_async_events(struct nvme_ctrl *ctrl);
	285
	286	void nvme_stop_queues(struct nvme_ctrl *ctrl);
	287	void nvme_start_queues(struct nvme_ctrl *ctrl);
	288	void nvme_kill_queues(struct nvme_ctrl *ctrl);
	289	void nvme_unfreeze(struct nvme_ctrl *ctrl);
	290	void nvme_wait_freeze(struct nvme_ctrl *ctrl);
	291	void nvme_wait_freeze_timeout(struct nvme_ctrl *ctrl, long timeout);
	292	void nvme_start_freeze(struct nvme_ctrl *ctrl);
	293
	294	#define NVME_QID_ANY -1
	295	struct request nvme_alloc_request(struct request_queue q,
	296	struct nvme_command *cmd, unsigned int flags, int qid);
	297	int nvme_setup_cmd(struct nvme_ns ns, struct request req,
	298	struct nvme_command *cmd);
	299	int nvme_submit_sync_cmd(struct request_queue q, struct nvme_command cmd,
	300	void *buf, unsigned bufflen);
	301	int __nvme_submit_sync_cmd(struct request_queue q, struct nvme_command cmd,
	302	union nvme_result result, void buffer, unsigned bufflen,
	303	unsigned timeout, int qid, int at_head, int flags);
	304	int nvme_submit_user_cmd(struct request_queue q, struct nvme_command cmd,
	305	void __user ubuffer, unsigned bufflen, u32 result,
	306	unsigned timeout);
	307	int __nvme_submit_user_cmd(struct request_queue q, struct nvme_command cmd,
	308	void __user *ubuffer, unsigned bufflen,
	309	void __user *meta_buffer, unsigned meta_len, u32 meta_seed,
	310	u32 *result, unsigned timeout);
	311	int nvme_identify_ctrl(struct nvme_ctrl dev, struct nvme_id_ctrl *id);
	312	int nvme_identify_ns(struct nvme_ctrl *dev, unsigned nsid,
	313	struct nvme_id_ns **id);
	314	int nvme_get_log_page(struct nvme_ctrl dev, struct nvme_smart_log *log);
	315	int nvme_get_features(struct nvme_ctrl *dev, unsigned fid, unsigned nsid,
	316	void buffer, size_t buflen, u32 result);
	317	int nvme_set_features(struct nvme_ctrl *dev, unsigned fid, unsigned dword11,
	318	void buffer, size_t buflen, u32 result);
	319	int nvme_set_queue_count(struct nvme_ctrl ctrl, int count);
	320	void nvme_start_keep_alive(struct nvme_ctrl *ctrl);
	321	void nvme_stop_keep_alive(struct nvme_ctrl *ctrl);
	322
	323	struct sg_io_hdr;
	324
	325	int nvme_sg_io(struct nvme_ns ns, struct sg_io_hdr __user u_hdr);
	326	int nvme_sg_io32(struct nvme_ns *ns, unsigned long arg);
	327	int nvme_sg_get_version_num(int __user *ip);
	328
	329	#ifdef CONFIG_NVM
	330	int nvme_nvm_ns_supported(struct nvme_ns ns, struct nvme_id_ns id);
	331	int nvme_nvm_register(struct nvme_ns ns, char disk_name, int node);
	332	void nvme_nvm_unregister(struct nvme_ns *ns);
	333	int nvme_nvm_register_sysfs(struct nvme_ns *ns);
	334	void nvme_nvm_unregister_sysfs(struct nvme_ns *ns);
	335	int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd, unsigned long arg);
	336	#else
	337	static inline int nvme_nvm_register(struct nvme_ns ns, char disk_name,
	338	int node)
	339	{
	340	return 0;
	341	}
	342
	343	static inline void nvme_nvm_unregister(struct nvme_ns *ns) {};
	344	static inline int nvme_nvm_register_sysfs(struct nvme_ns *ns)
	345	{
	346	return 0;
	347	}
	348	static inline void nvme_nvm_unregister_sysfs(struct nvme_ns *ns) {};
	349	static inline int nvme_nvm_ns_supported(struct nvme_ns ns, struct nvme_id_ns id)
	350	{
	351	return 0;
	352	}
	353	static inline int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd,
	354	unsigned long arg)
	355	{
	356	return -ENOTTY;
	357	}
	358	#endif /* CONFIG_NVM */
	359
	360	static inline struct nvme_ns nvme_get_ns_from_dev(struct device dev)
	361	{
	362	return dev_to_disk(dev)->private_data;
	363	}
	364
	365	int __init nvme_core_init(void);
	366	void nvme_core_exit(void);
	367
	368	#endif /* _NVME_H */