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freebsd/sys/dev/nvme/nvme.h
Jim Harris 5fdf9c3c8e Add unmapped bio support to nvme(4) and nvd(4). 
Sponsored by:	Intel
2013-04-01 16:23:34 +00:00

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/*-
* Copyright (C) 2012 Intel Corporation
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef __NVME_H__
#define __NVME_H__
#ifdef _KERNEL
#include <sys/types.h>
#endif
#define NVME_IDENTIFY_CONTROLLER _IOR('n', 0, struct nvme_controller_data)
#define NVME_IDENTIFY_NAMESPACE _IOR('n', 1, struct nvme_namespace_data)
#define NVME_IO_TEST _IOWR('n', 2, struct nvme_io_test)
#define NVME_BIO_TEST _IOWR('n', 4, struct nvme_io_test)
#define NVME_RESET_CONTROLLER _IO('n', 5)
/*
* Use to mark a command to apply to all namespaces, or to retrieve global
* log pages.
*/
#define NVME_GLOBAL_NAMESPACE_TAG ((uint32_t)0xFFFFFFFF)
union cap_lo_register {
uint32_t raw;
struct {
/** maximum queue entries supported */
uint32_t mqes : 16;
/** contiguous queues required */
uint32_t cqr : 1;
/** arbitration mechanism supported */
uint32_t ams : 2;
uint32_t reserved1 : 5;
/** timeout */
uint32_t to : 8;
} bits __packed;
} __packed;
union cap_hi_register {
uint32_t raw;
struct {
/** doorbell stride */
uint32_t dstrd : 4;
uint32_t reserved3 : 1;
/** command sets supported */
uint32_t css_nvm : 1;
uint32_t css_reserved : 3;
uint32_t reserved2 : 7;
/** memory page size minimum */
uint32_t mpsmin : 4;
/** memory page size maximum */
uint32_t mpsmax : 4;
uint32_t reserved1 : 8;
} bits __packed;
} __packed;
union cc_register {
uint32_t raw;
struct {
/** enable */
uint32_t en : 1;
uint32_t reserved1 : 3;
/** i/o command set selected */
uint32_t css : 3;
/** memory page size */
uint32_t mps : 4;
/** arbitration mechanism selected */
uint32_t ams : 3;
/** shutdown notification */
uint32_t shn : 2;
/** i/o submission queue entry size */
uint32_t iosqes : 4;
/** i/o completion queue entry size */
uint32_t iocqes : 4;
uint32_t reserved2 : 8;
} bits __packed;
} __packed;
enum shn_value {
NVME_SHN_NORMAL = 0x1,
NVME_SHN_ABRUPT = 0x2,
};
union csts_register {
uint32_t raw;
struct {
/** ready */
uint32_t rdy : 1;
/** controller fatal status */
uint32_t cfs : 1;
/** shutdown status */
uint32_t shst : 2;
uint32_t reserved1 : 28;
} bits __packed;
} __packed;
enum shst_value {
NVME_SHST_NORMAL = 0x0,
NVME_SHST_OCCURRING = 0x1,
NVME_SHST_COMPLETE = 0x2,
};
union aqa_register {
uint32_t raw;
struct {
/** admin submission queue size */
uint32_t asqs : 12;
uint32_t reserved1 : 4;
/** admin completion queue size */
uint32_t acqs : 12;
uint32_t reserved2 : 4;
} bits __packed;
} __packed;
struct nvme_registers
{
/** controller capabilities */
union cap_lo_register cap_lo;
union cap_hi_register cap_hi;
uint32_t vs; /* version */
uint32_t intms; /* interrupt mask set */
uint32_t intmc; /* interrupt mask clear */
/** controller configuration */
union cc_register cc;
uint32_t reserved1;
uint32_t csts; /* controller status */
uint32_t reserved2;
/** admin queue attributes */
union aqa_register aqa;
uint64_t asq; /* admin submission queue base addr */
uint64_t acq; /* admin completion queue base addr */
uint32_t reserved3[0x3f2];
struct {
uint32_t sq_tdbl; /* submission queue tail doorbell */
uint32_t cq_hdbl; /* completion queue head doorbell */
} doorbell[1] __packed;
} __packed;
struct nvme_command
{
/* dword 0 */
uint16_t opc : 8; /* opcode */
uint16_t fuse : 2; /* fused operation */
uint16_t rsvd1 : 6;
uint16_t cid; /* command identifier */
/* dword 1 */
uint32_t nsid; /* namespace identifier */
/* dword 2-3 */
uint32_t rsvd2;
uint32_t rsvd3;
/* dword 4-5 */
uint64_t mptr; /* metadata pointer */
/* dword 6-7 */
uint64_t prp1; /* prp entry 1 */
/* dword 8-9 */
uint64_t prp2; /* prp entry 2 */
/* dword 10-15 */
uint32_t cdw10; /* command-specific */
uint32_t cdw11; /* command-specific */
uint32_t cdw12; /* command-specific */
uint32_t cdw13; /* command-specific */
uint32_t cdw14; /* command-specific */
uint32_t cdw15; /* command-specific */
} __packed;
struct nvme_status {
uint16_t p : 1; /* phase tag */
uint16_t sc : 8; /* status code */
uint16_t sct : 3; /* status code type */
uint16_t rsvd2 : 2;
uint16_t m : 1; /* more */
uint16_t dnr : 1; /* do not retry */
} __packed;
struct nvme_completion {
/* dword 0 */
uint32_t cdw0; /* command-specific */
/* dword 1 */
uint32_t rsvd1;
/* dword 2 */
uint16_t sqhd; /* submission queue head pointer */
uint16_t sqid; /* submission queue identifier */
/* dword 3 */
uint16_t cid; /* command identifier */
struct nvme_status status;
} __packed;
struct nvme_dsm_range {
uint32_t attributes;
uint32_t length;
uint64_t starting_lba;
} __packed;
/* status code types */
enum nvme_status_code_type {
NVME_SCT_GENERIC = 0x0,
NVME_SCT_COMMAND_SPECIFIC = 0x1,
NVME_SCT_MEDIA_ERROR = 0x2,
/* 0x3-0x6 - reserved */
NVME_SCT_VENDOR_SPECIFIC = 0x7,
};
/* generic command status codes */
enum nvme_generic_command_status_code {
NVME_SC_SUCCESS = 0x00,
NVME_SC_INVALID_OPCODE = 0x01,
NVME_SC_INVALID_FIELD = 0x02,
NVME_SC_COMMAND_ID_CONFLICT = 0x03,
NVME_SC_DATA_TRANSFER_ERROR = 0x04,
NVME_SC_ABORTED_POWER_LOSS = 0x05,
NVME_SC_INTERNAL_DEVICE_ERROR = 0x06,
NVME_SC_ABORTED_BY_REQUEST = 0x07,
NVME_SC_ABORTED_SQ_DELETION = 0x08,
NVME_SC_ABORTED_FAILED_FUSED = 0x09,
NVME_SC_ABORTED_MISSING_FUSED = 0x0a,
NVME_SC_INVALID_NAMESPACE_OR_FORMAT = 0x0b,
NVME_SC_COMMAND_SEQUENCE_ERROR = 0x0c,
NVME_SC_LBA_OUT_OF_RANGE = 0x80,
NVME_SC_CAPACITY_EXCEEDED = 0x81,
NVME_SC_NAMESPACE_NOT_READY = 0x82,
};
/* command specific status codes */
enum nvme_command_specific_status_code {
NVME_SC_COMPLETION_QUEUE_INVALID = 0x00,
NVME_SC_INVALID_QUEUE_IDENTIFIER = 0x01,
NVME_SC_MAXIMUM_QUEUE_SIZE_EXCEEDED = 0x02,
NVME_SC_ABORT_COMMAND_LIMIT_EXCEEDED = 0x03,
/* 0x04 - reserved */
NVME_SC_ASYNC_EVENT_REQUEST_LIMIT_EXCEEDED = 0x05,
NVME_SC_INVALID_FIRMWARE_SLOT = 0x06,
NVME_SC_INVALID_FIRMWARE_IMAGE = 0x07,
NVME_SC_INVALID_INTERRUPT_VECTOR = 0x08,
NVME_SC_INVALID_LOG_PAGE = 0x09,
NVME_SC_INVALID_FORMAT = 0x0a,
NVME_SC_FIRMWARE_REQUIRES_RESET = 0x0b,
NVME_SC_CONFLICTING_ATTRIBUTES = 0x80,
NVME_SC_INVALID_PROTECTION_INFO = 0x81,
NVME_SC_ATTEMPTED_WRITE_TO_RO_PAGE = 0x82,
};
/* media error status codes */
enum nvme_media_error_status_code {
NVME_SC_WRITE_FAULTS = 0x80,
NVME_SC_UNRECOVERED_READ_ERROR = 0x81,
NVME_SC_GUARD_CHECK_ERROR = 0x82,
NVME_SC_APPLICATION_TAG_CHECK_ERROR = 0x83,
NVME_SC_REFERENCE_TAG_CHECK_ERROR = 0x84,
NVME_SC_COMPARE_FAILURE = 0x85,
NVME_SC_ACCESS_DENIED = 0x86,
};
/* admin opcodes */
enum nvme_admin_opcode {
NVME_OPC_DELETE_IO_SQ = 0x00,
NVME_OPC_CREATE_IO_SQ = 0x01,
NVME_OPC_GET_LOG_PAGE = 0x02,
/* 0x03 - reserved */
NVME_OPC_DELETE_IO_CQ = 0x04,
NVME_OPC_CREATE_IO_CQ = 0x05,
NVME_OPC_IDENTIFY = 0x06,
/* 0x07 - reserved */
NVME_OPC_ABORT = 0x08,
NVME_OPC_SET_FEATURES = 0x09,
NVME_OPC_GET_FEATURES = 0x0a,
/* 0x0b - reserved */
NVME_OPC_ASYNC_EVENT_REQUEST = 0x0c,
/* 0x0d-0x0f - reserved */
NVME_OPC_FIRMWARE_ACTIVATE = 0x10,
NVME_OPC_FIRMWARE_IMAGE_DOWNLOAD = 0x11,
NVME_OPC_FORMAT_NVM = 0x80,
NVME_OPC_SECURITY_SEND = 0x81,
NVME_OPC_SECURITY_RECEIVE = 0x82,
};
/* nvme nvm opcodes */
enum nvme_nvm_opcode {
NVME_OPC_FLUSH = 0x00,
NVME_OPC_WRITE = 0x01,
NVME_OPC_READ = 0x02,
/* 0x03 - reserved */
NVME_OPC_WRITE_UNCORRECTABLE = 0x04,
NVME_OPC_COMPARE = 0x05,
/* 0x06-0x07 - reserved */
NVME_OPC_DATASET_MANAGEMENT = 0x09,
};
enum nvme_feature {
/* 0x00 - reserved */
NVME_FEAT_ARBITRATION = 0x01,
NVME_FEAT_POWER_MANAGEMENT = 0x02,
NVME_FEAT_LBA_RANGE_TYPE = 0x03,
NVME_FEAT_TEMPERATURE_THRESHOLD = 0x04,
NVME_FEAT_ERROR_RECOVERY = 0x05,
NVME_FEAT_VOLATILE_WRITE_CACHE = 0x06,
NVME_FEAT_NUMBER_OF_QUEUES = 0x07,
NVME_FEAT_INTERRUPT_COALESCING = 0x08,
NVME_FEAT_INTERRUPT_VECTOR_CONFIGURATION = 0x09,
NVME_FEAT_WRITE_ATOMICITY = 0x0A,
NVME_FEAT_ASYNC_EVENT_CONFIGURATION = 0x0B,
/* 0x0C-0x7F - reserved */
NVME_FEAT_SOFTWARE_PROGRESS_MARKER = 0x80,
/* 0x81-0xBF - command set specific (reserved) */
/* 0xC0-0xFF - vendor specific */
};
enum nvme_dsm_attribute {
NVME_DSM_ATTR_INTEGRAL_READ = 0x1,
NVME_DSM_ATTR_INTEGRAL_WRITE = 0x2,
NVME_DSM_ATTR_DEALLOCATE = 0x4,
};
struct nvme_controller_data {
/* bytes 0-255: controller capabilities and features */
/** pci vendor id */
uint16_t vid;
/** pci subsystem vendor id */
uint16_t ssvid;
/** serial number */
int8_t sn[20];
/** model number */
int8_t mn[40];
/** firmware revision */
uint8_t fr[8];
/** recommended arbitration burst */
uint8_t rab;
/** ieee oui identifier */
uint8_t ieee[3];
/** multi-interface capabilities */
uint8_t mic;
/** maximum data transfer size */
uint8_t mdts;
uint8_t reserved1[178];
/* bytes 256-511: admin command set attributes */
/** optional admin command support */
struct {
/* supports security send/receive commands */
uint16_t security : 1;
/* supports format nvm command */
uint16_t format : 1;
/* supports firmware activate/download commands */
uint16_t firmware : 1;
uint16_t oacs_rsvd : 13;
} __packed oacs;
/** abort command limit */
uint8_t acl;
/** asynchronous event request limit */
uint8_t aerl;
/** firmware updates */
struct {
/* first slot is read-only */
uint8_t slot1_ro : 1;
/* number of firmware slots */
uint8_t num_slots : 3;
uint8_t frmw_rsvd : 4;
} __packed frmw;
/** log page attributes */
struct {
/* per namespace smart/health log page */
uint8_t ns_smart : 1;
uint8_t lpa_rsvd : 7;
} __packed lpa;
/** error log page entries */
uint8_t elpe;
/** number of power states supported */
uint8_t npss;
/** admin vendor specific command configuration */
struct {
/* admin vendor specific commands use spec format */
uint8_t spec_format : 1;
uint8_t avscc_rsvd : 7;
} __packed avscc;
uint8_t reserved2[247];
/* bytes 512-703: nvm command set attributes */
/** submission queue entry size */
struct {
uint8_t min : 4;
uint8_t max : 4;
} __packed sqes;
/** completion queue entry size */
struct {
uint8_t min : 4;
uint8_t max : 4;
} __packed cqes;
uint8_t reserved3[2];
/** number of namespaces */
uint32_t nn;
/** optional nvm command support */
struct {
uint16_t compare : 1;
uint16_t write_unc : 1;
uint16_t dsm: 1;
uint16_t reserved: 13;
} __packed oncs;
/** fused operation support */
uint16_t fuses;
/** format nvm attributes */
uint8_t fna;
/** volatile write cache */
struct {
uint8_t present : 1;
uint8_t reserved : 7;
} __packed vwc;
/* TODO: flesh out remaining nvm command set attributes */
uint8_t reserved4[178];
/* bytes 704-2047: i/o command set attributes */
uint8_t reserved5[1344];
/* bytes 2048-3071: power state descriptors */
uint8_t reserved6[1024];
/* bytes 3072-4095: vendor specific */
uint8_t reserved7[1024];
} __packed __aligned(4);
struct nvme_namespace_data {
/** namespace size */
uint64_t nsze;
/** namespace capacity */
uint64_t ncap;
/** namespace utilization */
uint64_t nuse;
/** namespace features */
struct {
/** thin provisioning */
uint8_t thin_prov : 1;
uint8_t reserved1 : 7;
} __packed nsfeat;
/** number of lba formats */
uint8_t nlbaf;
/** formatted lba size */
struct {
uint8_t format : 4;
uint8_t extended : 1;
uint8_t reserved2 : 3;
} __packed flbas;
/** metadata capabilities */
struct {
/* metadata can be transferred as part of data prp list */
uint8_t extended : 1;
/* metadata can be transferred with separate metadata pointer */
uint8_t pointer : 1;
uint8_t reserved3 : 6;
} __packed mc;
/** end-to-end data protection capabilities */
struct {
/* protection information type 1 */
uint8_t pit1 : 1;
/* protection information type 2 */
uint8_t pit2 : 1;
/* protection information type 3 */
uint8_t pit3 : 1;
/* first eight bytes of metadata */
uint8_t md_start : 1;
/* last eight bytes of metadata */
uint8_t md_end : 1;
} __packed dpc;
/** end-to-end data protection type settings */
struct {
/* protection information type */
uint8_t pit : 3;
/* 1 == protection info transferred at start of metadata */
/* 0 == protection info transferred at end of metadata */
uint8_t md_start : 1;
uint8_t reserved4 : 4;
} __packed dps;
uint8_t reserved5[98];
/** lba format support */
struct {
/** metadata size */
uint32_t ms : 16;
/** lba data size */
uint32_t lbads : 8;
/** relative performance */
uint32_t rp : 2;
uint32_t reserved6 : 6;
} __packed lbaf[16];
uint8_t reserved6[192];
uint8_t vendor_specific[3712];
} __packed __aligned(4);
enum nvme_log_page {
/* 0x00 - reserved */
NVME_LOG_ERROR = 0x01,
NVME_LOG_HEALTH_INFORMATION = 0x02,
NVME_LOG_FIRMWARE_SLOT = 0x03,
/* 0x04-0x7F - reserved */
/* 0x80-0xBF - I/O command set specific */
/* 0xC0-0xFF - vendor specific */
};
struct nvme_error_information_entry {
uint64_t error_count;
uint16_t sqid;
uint16_t cid;
struct nvme_status status;
uint16_t error_location;
uint64_t lba;
uint32_t nsid;
uint8_t vendor_specific;
uint8_t reserved[35];
} __packed __aligned(4);
union nvme_critical_warning_state {
uint8_t raw;
struct {
uint8_t available_spare : 1;
uint8_t temperature : 1;
uint8_t device_reliability : 1;
uint8_t read_only : 1;
uint8_t volatile_memory_backup : 1;
uint8_t reserved : 3;
} __packed bits;
} __packed;
struct nvme_health_information_page {
union nvme_critical_warning_state critical_warning;
uint16_t temperature;
uint8_t available_spare;
uint8_t available_spare_threshold;
uint8_t percentage_used;
uint8_t reserved[26];
/*
* Note that the following are 128-bit values, but are
* defined as an array of 2 64-bit values.
*/
/* Data Units Read is always in 512-byte units. */
uint64_t data_units_read[2];
/* Data Units Written is always in 512-byte units. */
uint64_t data_units_written[2];
/* For NVM command set, this includes Compare commands. */
uint64_t host_read_commands[2];
uint64_t host_write_commands[2];
/* Controller Busy Time is reported in minutes. */
uint64_t controller_busy_time[2];
uint64_t power_cycles[2];
uint64_t power_on_hours[2];
uint64_t unsafe_shutdowns[2];
uint64_t media_errors[2];
uint64_t num_error_info_log_entries[2];
uint8_t reserved2[320];
} __packed __aligned(4);
struct nvme_firmware_page {
struct {
uint8_t slot : 3; /* slot for current FW */
uint8_t reserved : 5;
} __packed afi;
uint8_t reserved[7];
uint64_t revision[7]; /* revisions for 7 slots */
uint8_t reserved2[448];
} __packed __aligned(4);
#define NVME_TEST_MAX_THREADS 128
struct nvme_io_test {
enum nvme_nvm_opcode opc;
uint32_t size;
uint32_t time; /* in seconds */
uint32_t num_threads;
uint32_t flags;
uint32_t io_completed[NVME_TEST_MAX_THREADS];
};
enum nvme_io_test_flags {
/*
* Specifies whether dev_refthread/dev_relthread should be
* called during NVME_BIO_TEST. Ignored for other test
* types.
*/
NVME_TEST_FLAG_REFTHREAD = 0x1,
};
#define nvme_completion_is_error(cpl) \
((cpl)->status.sc != 0 || (cpl)->status.sct != 0)
#ifdef _KERNEL
struct bio;
struct nvme_namespace;
struct nvme_controller;
struct nvme_consumer;
typedef void (*nvme_cb_fn_t)(void *, const struct nvme_completion *);
typedef void *(*nvme_cons_ns_fn_t)(struct nvme_namespace *, void *);
typedef void *(*nvme_cons_ctrlr_fn_t)(struct nvme_controller *);
typedef void (*nvme_cons_async_fn_t)(void *, const struct nvme_completion *,
uint32_t, void *, uint32_t);
typedef void (*nvme_cons_fail_fn_t)(void *);
enum nvme_namespace_flags {
NVME_NS_DEALLOCATE_SUPPORTED = 0x1,
NVME_NS_FLUSH_SUPPORTED = 0x2,
};
/* Admin functions */
void nvme_ctrlr_cmd_set_feature(struct nvme_controller *ctrlr,
uint8_t feature, uint32_t cdw11,
void *payload, uint32_t payload_size,
nvme_cb_fn_t cb_fn, void *cb_arg);
void nvme_ctrlr_cmd_get_feature(struct nvme_controller *ctrlr,
uint8_t feature, uint32_t cdw11,
void *payload, uint32_t payload_size,
nvme_cb_fn_t cb_fn, void *cb_arg);
void nvme_ctrlr_cmd_get_log_page(struct nvme_controller *ctrlr,
uint8_t log_page, uint32_t nsid,
void *payload, uint32_t payload_size,
nvme_cb_fn_t cb_fn, void *cb_arg);
/* NVM I/O functions */
int nvme_ns_cmd_write(struct nvme_namespace *ns, void *payload,
uint64_t lba, uint32_t lba_count, nvme_cb_fn_t cb_fn,
void *cb_arg);
int nvme_ns_cmd_write_bio(struct nvme_namespace *ns, struct bio *bp,
nvme_cb_fn_t cb_fn, void *cb_arg);
int nvme_ns_cmd_read(struct nvme_namespace *ns, void *payload,
uint64_t lba, uint32_t lba_count, nvme_cb_fn_t cb_fn,
void *cb_arg);
int nvme_ns_cmd_read_bio(struct nvme_namespace *ns, struct bio *bp,
nvme_cb_fn_t cb_fn, void *cb_arg);
int nvme_ns_cmd_deallocate(struct nvme_namespace *ns, void *payload,
uint8_t num_ranges, nvme_cb_fn_t cb_fn,
void *cb_arg);
int nvme_ns_cmd_flush(struct nvme_namespace *ns, nvme_cb_fn_t cb_fn,
void *cb_arg);
/* Registration functions */
struct nvme_consumer * nvme_register_consumer(nvme_cons_ns_fn_t ns_fn,
nvme_cons_ctrlr_fn_t ctrlr_fn,
nvme_cons_async_fn_t async_fn,
nvme_cons_fail_fn_t fail_fn);
void nvme_unregister_consumer(struct nvme_consumer *consumer);
/* Controller helper functions */
device_t nvme_ctrlr_get_device(struct nvme_controller *ctrlr);
const struct nvme_controller_data *
nvme_ctrlr_get_data(struct nvme_controller *ctrlr);
/* Namespace helper functions */
uint32_t nvme_ns_get_max_io_xfer_size(struct nvme_namespace *ns);
uint32_t nvme_ns_get_sector_size(struct nvme_namespace *ns);
uint64_t nvme_ns_get_num_sectors(struct nvme_namespace *ns);
uint64_t nvme_ns_get_size(struct nvme_namespace *ns);
uint32_t nvme_ns_get_flags(struct nvme_namespace *ns);
const char * nvme_ns_get_serial_number(struct nvme_namespace *ns);
const char * nvme_ns_get_model_number(struct nvme_namespace *ns);
const struct nvme_namespace_data *
nvme_ns_get_data(struct nvme_namespace *ns);
int nvme_ns_bio_process(struct nvme_namespace *ns, struct bio *bp,
nvme_cb_fn_t cb_fn);
#endif /* _KERNEL */
#endif /* __NVME_H__ */
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