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linux/include/scsi/scsi_proto.h
John Garry bf4ae8f2e6 scsi: sd: Atomic write support 
Support is divided into two main areas:
- reading VPD pages and setting sdev request_queue limits
- support WRITE ATOMIC (16) command and tracing

The relevant block limits VPD page need to be read to allow the block layer
request_queue atomic write limits to be set. These VPD page limits are
described in sbc4r22 section 6.6.4 - Block limits VPD page.

There are five limits of interest:
- MAXIMUM ATOMIC TRANSFER LENGTH
- ATOMIC ALIGNMENT
- ATOMIC TRANSFER LENGTH GRANULARITY
- MAXIMUM ATOMIC TRANSFER LENGTH WITH BOUNDARY
- MAXIMUM ATOMIC BOUNDARY SIZE

MAXIMUM ATOMIC TRANSFER LENGTH is the maximum length for a WRITE ATOMIC
(16) command. It will not be greater than the device MAXIMUM TRANSFER
LENGTH.

ATOMIC ALIGNMENT and ATOMIC TRANSFER LENGTH GRANULARITY are the minimum
alignment and length values for an atomic write in terms of logical blocks.

Unlike NVMe, SCSI does not specify an LBA space boundary, but does specify
a per-IO boundary granularity. The maximum boundary size is specified in
MAXIMUM ATOMIC BOUNDARY SIZE. When used, this boundary value is set in the
WRITE ATOMIC (16) ATOMIC BOUNDARY field - layout for the WRITE_ATOMIC_16
command can be found in sbc4r22 section 5.48. This boundary value is the
granularity size at which the device may atomically write the data. A value
of zero in WRITE ATOMIC (16) ATOMIC BOUNDARY field means that all data must
be atomically written together.

MAXIMUM ATOMIC TRANSFER LENGTH WITH BOUNDARY is the maximum atomic write
length if a non-zero boundary value is set.

For atomic write support, the WRITE ATOMIC (16) boundary is not of much
interest, as the block layer expects each request submitted to be executed
atomically. However, the SCSI spec does leave itself open to a quirky
scenario where MAXIMUM ATOMIC TRANSFER LENGTH is zero, yet MAXIMUM ATOMIC
TRANSFER LENGTH WITH BOUNDARY and MAXIMUM ATOMIC BOUNDARY SIZE are both
non-zero. This case will be supported.

To set the block layer request_queue atomic write capabilities, sanitize
the VPD page limits and set limits as follows:
- atomic_write_unit_min is derived from granularity and alignment values.
  If no granularity value is not set, use physical block size
- atomic_write_unit_max is derived from MAXIMUM ATOMIC TRANSFER LENGTH. In
  the scenario where MAXIMUM ATOMIC TRANSFER LENGTH is zero and boundary
  limits are non-zero, use MAXIMUM ATOMIC BOUNDARY SIZE for
  atomic_write_unit_max. New flag scsi_disk.use_atomic_write_boundary is
  set for this scenario.
- atomic_write_boundary_bytes is set to zero always

SCSI also supports a WRITE ATOMIC (32) command, which is for type 2
protection enabled. This is not going to be supported now, so check for
T10_PI_TYPE2_PROTECTION when setting any request_queue limits.

To handle an atomic write request, add support for WRITE ATOMIC (16)
command in handler sd_setup_atomic_cmnd(). Flag use_atomic_write_boundary
is checked here for encoding ATOMIC BOUNDARY field.

Trace info is also added for WRITE_ATOMIC_16 command.

Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: John Garry <john.g.garry@oracle.com>
Acked-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Link: https://lore.kernel.org/r/20240620125359.2684798-9-john.g.garry@oracle.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2024-06-20 15:19:17 -06:00

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/* SPDX-License-Identifier: GPL-2.0 */
/*
* This header file contains public constants and structures used by
* both the SCSI initiator and the SCSI target code.
*
* For documentation on the OPCODES, MESSAGES, and SENSE values,
* please consult the SCSI standard.
*/
#ifndef _SCSI_PROTO_H_
#define _SCSI_PROTO_H_
#include <linux/build_bug.h>
#include <linux/types.h>
/*
* SCSI opcodes
*/
#define TEST_UNIT_READY 0x00
#define REZERO_UNIT 0x01
#define REQUEST_SENSE 0x03
#define FORMAT_UNIT 0x04
#define READ_BLOCK_LIMITS 0x05
#define REASSIGN_BLOCKS 0x07
#define INITIALIZE_ELEMENT_STATUS 0x07
#define READ_6 0x08
#define WRITE_6 0x0a
#define SEEK_6 0x0b
#define READ_REVERSE 0x0f
#define WRITE_FILEMARKS 0x10
#define SPACE 0x11
#define INQUIRY 0x12
#define RECOVER_BUFFERED_DATA 0x14
#define MODE_SELECT 0x15
#define RESERVE 0x16
#define RELEASE 0x17
#define COPY 0x18
#define ERASE 0x19
#define MODE_SENSE 0x1a
#define START_STOP 0x1b
#define RECEIVE_DIAGNOSTIC 0x1c
#define SEND_DIAGNOSTIC 0x1d
#define ALLOW_MEDIUM_REMOVAL 0x1e
#define READ_FORMAT_CAPACITIES 0x23
#define SET_WINDOW 0x24
#define READ_CAPACITY 0x25
#define READ_10 0x28
#define WRITE_10 0x2a
#define SEEK_10 0x2b
#define POSITION_TO_ELEMENT 0x2b
#define WRITE_VERIFY 0x2e
#define VERIFY 0x2f
#define SEARCH_HIGH 0x30
#define SEARCH_EQUAL 0x31
#define SEARCH_LOW 0x32
#define SET_LIMITS 0x33
#define PRE_FETCH 0x34
#define READ_POSITION 0x34
#define SYNCHRONIZE_CACHE 0x35
#define LOCK_UNLOCK_CACHE 0x36
#define READ_DEFECT_DATA 0x37
#define MEDIUM_SCAN 0x38
#define COMPARE 0x39
#define COPY_VERIFY 0x3a
#define WRITE_BUFFER 0x3b
#define READ_BUFFER 0x3c
#define UPDATE_BLOCK 0x3d
#define READ_LONG 0x3e
#define WRITE_LONG 0x3f
#define CHANGE_DEFINITION 0x40
#define WRITE_SAME 0x41
#define UNMAP 0x42
#define READ_TOC 0x43
#define READ_HEADER 0x44
#define GET_EVENT_STATUS_NOTIFICATION 0x4a
#define LOG_SELECT 0x4c
#define LOG_SENSE 0x4d
#define XDWRITEREAD_10 0x53
#define MODE_SELECT_10 0x55
#define RESERVE_10 0x56
#define RELEASE_10 0x57
#define MODE_SENSE_10 0x5a
#define PERSISTENT_RESERVE_IN 0x5e
#define PERSISTENT_RESERVE_OUT 0x5f
#define VARIABLE_LENGTH_CMD 0x7f
#define REPORT_LUNS 0xa0
#define SECURITY_PROTOCOL_IN 0xa2
#define MAINTENANCE_IN 0xa3
#define MAINTENANCE_OUT 0xa4
#define MOVE_MEDIUM 0xa5
#define EXCHANGE_MEDIUM 0xa6
#define READ_12 0xa8
#define SERVICE_ACTION_OUT_12 0xa9
#define WRITE_12 0xaa
#define READ_MEDIA_SERIAL_NUMBER 0xab /* Obsolete with SPC-2 */
#define SERVICE_ACTION_IN_12 0xab
#define WRITE_VERIFY_12 0xae
#define VERIFY_12 0xaf
#define SEARCH_HIGH_12 0xb0
#define SEARCH_EQUAL_12 0xb1
#define SEARCH_LOW_12 0xb2
#define SECURITY_PROTOCOL_OUT 0xb5
#define READ_ELEMENT_STATUS 0xb8
#define SEND_VOLUME_TAG 0xb6
#define WRITE_LONG_2 0xea
#define EXTENDED_COPY 0x83
#define RECEIVE_COPY_RESULTS 0x84
#define ACCESS_CONTROL_IN 0x86
#define ACCESS_CONTROL_OUT 0x87
#define READ_16 0x88
#define COMPARE_AND_WRITE 0x89
#define WRITE_16 0x8a
#define READ_ATTRIBUTE 0x8c
#define WRITE_ATTRIBUTE 0x8d
#define WRITE_VERIFY_16 0x8e
#define VERIFY_16 0x8f
#define SYNCHRONIZE_CACHE_16 0x91
#define WRITE_SAME_16 0x93
#define ZBC_OUT 0x94
#define ZBC_IN 0x95
#define WRITE_ATOMIC_16 0x9c
#define SERVICE_ACTION_BIDIRECTIONAL 0x9d
#define SERVICE_ACTION_IN_16 0x9e
#define SERVICE_ACTION_OUT_16 0x9f
/* values for service action in */
#define SAI_READ_CAPACITY_16 0x10
#define SAI_GET_LBA_STATUS 0x12
#define SAI_REPORT_REFERRALS 0x13
#define SAI_GET_STREAM_STATUS 0x16
/* values for maintenance in */
#define MI_REPORT_IDENTIFYING_INFORMATION 0x05
#define MI_REPORT_TARGET_PGS 0x0a
#define MI_REPORT_ALIASES 0x0b
#define MI_REPORT_SUPPORTED_OPERATION_CODES 0x0c
#define MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS 0x0d
#define MI_REPORT_PRIORITY 0x0e
#define MI_REPORT_TIMESTAMP 0x0f
#define MI_MANAGEMENT_PROTOCOL_IN 0x10
/* value for MI_REPORT_TARGET_PGS ext header */
#define MI_EXT_HDR_PARAM_FMT 0x20
/* values for maintenance out */
#define MO_SET_IDENTIFYING_INFORMATION 0x06
#define MO_SET_TARGET_PGS 0x0a
#define MO_CHANGE_ALIASES 0x0b
#define MO_SET_PRIORITY 0x0e
#define MO_SET_TIMESTAMP 0x0f
#define MO_MANAGEMENT_PROTOCOL_OUT 0x10
/* values for ZBC_IN */
#define ZI_REPORT_ZONES 0x00
/* values for ZBC_OUT */
#define ZO_CLOSE_ZONE 0x01
#define ZO_FINISH_ZONE 0x02
#define ZO_OPEN_ZONE 0x03
#define ZO_RESET_WRITE_POINTER 0x04
/* values for PR in service action */
#define READ_KEYS 0x00
#define READ_RESERVATION 0x01
#define REPORT_CAPABILITES 0x02
#define READ_FULL_STATUS 0x03
/* values for variable length command */
#define XDREAD_32 0x03
#define XDWRITE_32 0x04
#define XPWRITE_32 0x06
#define XDWRITEREAD_32 0x07
#define READ_32 0x09
#define VERIFY_32 0x0a
#define WRITE_32 0x0b
#define WRITE_VERIFY_32 0x0c
#define WRITE_SAME_32 0x0d
#define ATA_32 0x1ff0
/* Values for T10/04-262r7 */
#define ATA_16 0x85 /* 16-byte pass-thru */
#define ATA_12 0xa1 /* 12-byte pass-thru */
/* Vendor specific CDBs start here */
#define VENDOR_SPECIFIC_CDB 0xc0
/*
* SCSI command lengths
*/
#define SCSI_MAX_VARLEN_CDB_SIZE 260
/* defined in T10 SCSI Primary Commands-2 (SPC2) */
struct scsi_varlen_cdb_hdr {
__u8 opcode; /* opcode always == VARIABLE_LENGTH_CMD */
__u8 control;
__u8 misc[5];
__u8 additional_cdb_length; /* total cdb length - 8 */
__be16 service_action;
/* service specific data follows */
};
/*
* SCSI Architecture Model (SAM) Status codes. Taken from SAM-3 draft
* T10/1561-D Revision 4 Draft dated 7th November 2002.
*/
enum sam_status {
SAM_STAT_GOOD = 0x00,
SAM_STAT_CHECK_CONDITION = 0x02,
SAM_STAT_CONDITION_MET = 0x04,
SAM_STAT_BUSY = 0x08,
SAM_STAT_INTERMEDIATE = 0x10,
SAM_STAT_INTERMEDIATE_CONDITION_MET = 0x14,
SAM_STAT_RESERVATION_CONFLICT = 0x18,
SAM_STAT_COMMAND_TERMINATED = 0x22, /* obsolete in SAM-3 */
SAM_STAT_TASK_SET_FULL = 0x28,
SAM_STAT_ACA_ACTIVE = 0x30,
SAM_STAT_TASK_ABORTED = 0x40,
};
#define STATUS_MASK 0xfe
/*
* SENSE KEYS
*/
#define NO_SENSE 0x00
#define RECOVERED_ERROR 0x01
#define NOT_READY 0x02
#define MEDIUM_ERROR 0x03
#define HARDWARE_ERROR 0x04
#define ILLEGAL_REQUEST 0x05
#define UNIT_ATTENTION 0x06
#define DATA_PROTECT 0x07
#define BLANK_CHECK 0x08
#define VENDOR_SPECIFIC 0x09
#define COPY_ABORTED 0x0a
#define ABORTED_COMMAND 0x0b
#define VOLUME_OVERFLOW 0x0d
#define MISCOMPARE 0x0e
#define COMPLETED 0x0f
/*
* DEVICE TYPES
* Please keep them in 0x%02x format for $MODALIAS to work
*/
#define TYPE_DISK 0x00
#define TYPE_TAPE 0x01
#define TYPE_PRINTER 0x02
#define TYPE_PROCESSOR 0x03 /* HP scanners use this */
#define TYPE_WORM 0x04 /* Treated as ROM by our system */
#define TYPE_ROM 0x05
#define TYPE_SCANNER 0x06
#define TYPE_MOD 0x07 /* Magneto-optical disk -
* - treated as TYPE_DISK */
#define TYPE_MEDIUM_CHANGER 0x08
#define TYPE_COMM 0x09 /* Communications device */
#define TYPE_RAID 0x0c
#define TYPE_ENCLOSURE 0x0d /* Enclosure Services Device */
#define TYPE_RBC 0x0e
#define TYPE_OSD 0x11
#define TYPE_ZBC 0x14
#define TYPE_WLUN 0x1e /* well-known logical unit */
#define TYPE_NO_LUN 0x7f
/* SCSI protocols; these are taken from SPC-3 section 7.5 */
enum scsi_protocol {
SCSI_PROTOCOL_FCP = 0, /* Fibre Channel */
SCSI_PROTOCOL_SPI = 1, /* parallel SCSI */
SCSI_PROTOCOL_SSA = 2, /* Serial Storage Architecture - Obsolete */
SCSI_PROTOCOL_SBP = 3, /* firewire */
SCSI_PROTOCOL_SRP = 4, /* Infiniband RDMA */
SCSI_PROTOCOL_ISCSI = 5,
SCSI_PROTOCOL_SAS = 6,
SCSI_PROTOCOL_ADT = 7, /* Media Changers */
SCSI_PROTOCOL_ATA = 8,
SCSI_PROTOCOL_UNSPEC = 0xf, /* No specific protocol */
};
/*
* ScsiLun: 8 byte LUN.
*/
struct scsi_lun {
__u8 scsi_lun[8];
};
/* SBC-5 IO advice hints group descriptor */
struct scsi_io_group_descriptor {
#if defined(__BIG_ENDIAN)
u8 io_advice_hints_mode: 2;
u8 reserved1: 3;
u8 st_enble: 1;
u8 cs_enble: 1;
u8 ic_enable: 1;
#elif defined(__LITTLE_ENDIAN)
u8 ic_enable: 1;
u8 cs_enble: 1;
u8 st_enble: 1;
u8 reserved1: 3;
u8 io_advice_hints_mode: 2;
#else
#error
#endif
u8 reserved2[3];
/* Logical block markup descriptor */
#if defined(__BIG_ENDIAN)
u8 acdlu: 1;
u8 reserved3: 1;
u8 rlbsr: 2;
u8 lbm_descriptor_type: 4;
#elif defined(__LITTLE_ENDIAN)
u8 lbm_descriptor_type: 4;
u8 rlbsr: 2;
u8 reserved3: 1;
u8 acdlu: 1;
#else
#error
#endif
u8 params[2];
u8 reserved4;
u8 reserved5[8];
};
static_assert(sizeof(struct scsi_io_group_descriptor) == 16);
/* SCSI stream status descriptor */
struct scsi_stream_status {
#if defined(__BIG_ENDIAN)
u8 perm: 1;
u8 reserved1: 7;
#elif defined(__LITTLE_ENDIAN)
u8 reserved1: 7;
u8 perm: 1;
#else
#error
#endif
u8 reserved2;
__be16 stream_identifier;
#if defined(__BIG_ENDIAN)
u8 reserved3: 2;
u8 rel_lifetime: 6;
#elif defined(__LITTLE_ENDIAN)
u8 rel_lifetime: 6;
u8 reserved3: 2;
#else
#error
#endif
u8 reserved4[3];
};
static_assert(sizeof(struct scsi_stream_status) == 8);
/* GET STREAM STATUS parameter data */
struct scsi_stream_status_header {
__be32 len; /* length in bytes of stream_status[] array. */
u16 reserved;
__be16 number_of_open_streams;
DECLARE_FLEX_ARRAY(struct scsi_stream_status, stream_status);
};
static_assert(sizeof(struct scsi_stream_status_header) == 8);
/* SPC asymmetric access states */
#define SCSI_ACCESS_STATE_OPTIMAL 0x00
#define SCSI_ACCESS_STATE_ACTIVE 0x01
#define SCSI_ACCESS_STATE_STANDBY 0x02
#define SCSI_ACCESS_STATE_UNAVAILABLE 0x03
#define SCSI_ACCESS_STATE_LBA 0x04
#define SCSI_ACCESS_STATE_OFFLINE 0x0e
#define SCSI_ACCESS_STATE_TRANSITIONING 0x0f
/* Values for REPORT TARGET GROUP STATES */
#define SCSI_ACCESS_STATE_MASK 0x0f
#define SCSI_ACCESS_STATE_PREFERRED 0x80
/* Reporting options for REPORT ZONES */
enum zbc_zone_reporting_options {
ZBC_ZONE_REPORTING_OPTION_ALL = 0x00,
ZBC_ZONE_REPORTING_OPTION_EMPTY = 0x01,
ZBC_ZONE_REPORTING_OPTION_IMPLICIT_OPEN = 0x02,
ZBC_ZONE_REPORTING_OPTION_EXPLICIT_OPEN = 0x03,
ZBC_ZONE_REPORTING_OPTION_CLOSED = 0x04,
ZBC_ZONE_REPORTING_OPTION_FULL = 0x05,
ZBC_ZONE_REPORTING_OPTION_READONLY = 0x06,
ZBC_ZONE_REPORTING_OPTION_OFFLINE = 0x07,
/* 0x08 to 0x0f are reserved */
ZBC_ZONE_REPORTING_OPTION_NEED_RESET_WP = 0x10,
ZBC_ZONE_REPORTING_OPTION_NON_SEQWRITE = 0x11,
/* 0x12 to 0x3e are reserved */
ZBC_ZONE_REPORTING_OPTION_NON_WP = 0x3f,
};
#define ZBC_REPORT_ZONE_PARTIAL 0x80
/* Zone types of REPORT ZONES zone descriptors */
enum zbc_zone_type {
ZBC_ZONE_TYPE_CONV = 0x1,
ZBC_ZONE_TYPE_SEQWRITE_REQ = 0x2,
ZBC_ZONE_TYPE_SEQWRITE_PREF = 0x3,
ZBC_ZONE_TYPE_SEQ_OR_BEFORE_REQ = 0x4,
ZBC_ZONE_TYPE_GAP = 0x5,
/* 0x6 to 0xf are reserved */
};
/* Zone conditions of REPORT ZONES zone descriptors */
enum zbc_zone_cond {
ZBC_ZONE_COND_NO_WP = 0x0,
ZBC_ZONE_COND_EMPTY = 0x1,
ZBC_ZONE_COND_IMP_OPEN = 0x2,
ZBC_ZONE_COND_EXP_OPEN = 0x3,
ZBC_ZONE_COND_CLOSED = 0x4,
/* 0x5 to 0xc are reserved */
ZBC_ZONE_COND_READONLY = 0xd,
ZBC_ZONE_COND_FULL = 0xe,
ZBC_ZONE_COND_OFFLINE = 0xf,
};
enum zbc_zone_alignment_method {
ZBC_CONSTANT_ZONE_LENGTH = 0x1,
ZBC_CONSTANT_ZONE_START_OFFSET = 0x8,
};
/* Version descriptor values for INQUIRY */
enum scsi_version_descriptor {
SCSI_VERSION_DESCRIPTOR_FCP4 = 0x0a40,
SCSI_VERSION_DESCRIPTOR_ISCSI = 0x0960,
SCSI_VERSION_DESCRIPTOR_SAM5 = 0x00a0,
SCSI_VERSION_DESCRIPTOR_SAS3 = 0x0c60,
SCSI_VERSION_DESCRIPTOR_SBC3 = 0x04c0,
SCSI_VERSION_DESCRIPTOR_SBP3 = 0x0980,
SCSI_VERSION_DESCRIPTOR_SPC4 = 0x0460,
SCSI_VERSION_DESCRIPTOR_SRP = 0x0940
};
enum scsi_support_opcode {
SCSI_SUPPORT_NO_INFO = 0,
SCSI_SUPPORT_NOT_SUPPORTED = 1,
SCSI_SUPPORT_FULL = 3,
SCSI_SUPPORT_VENDOR = 5,
};
#define SCSI_CONTROL_MASK 0
#define SCSI_GROUP_NUMBER_MASK 0
#endif /* _SCSI_PROTO_H_ */
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