| #ifndef _SCSI_GENERIC_H |
| #define _SCSI_GENERIC_H |
| |
| #include <linux/compiler.h> |
| |
| /* |
| * History: |
| * Started: Aug 9 by Lawrence Foard (entropy@world.std.com), to allow user |
| * process control of SCSI devices. |
| * Development Sponsored by Killy Corp. NY NY |
| * |
| * Original driver (sg.h): |
| * Copyright (C) 1992 Lawrence Foard |
| * Version 2 and 3 extensions to driver: |
| * Copyright (C) 1998 - 2014 Douglas Gilbert |
| * |
| * Version: 3.5.36 (20140603) |
| * This version is for 2.6 and 3 series kernels. |
| * |
| * Documentation |
| * ============= |
| * A web site for the SG device driver can be found at: |
| * http://sg.danny.cz/sg [alternatively check the MAINTAINERS file] |
| * The documentation for the sg version 3 driver can be found at: |
| * http://sg.danny.cz/sg/p/sg_v3_ho.html |
| * Also see: <kernel_source>/Documentation/scsi/scsi-generic.txt |
| * |
| * For utility and test programs see: http://sg.danny.cz/sg/sg3_utils.html |
| */ |
| |
| #ifdef __KERNEL__ |
| extern int sg_big_buff; /* for sysctl */ |
| #endif |
| |
| |
| typedef struct sg_iovec /* same structure as used by readv() Linux system */ |
| { /* call. It defines one scatter-gather element. */ |
| void __user *iov_base; /* Starting address */ |
| size_t iov_len; /* Length in bytes */ |
| } sg_iovec_t; |
| |
| |
| typedef struct sg_io_hdr |
| { |
| int interface_id; /* [i] 'S' for SCSI generic (required) */ |
| int dxfer_direction; /* [i] data transfer direction */ |
| unsigned char cmd_len; /* [i] SCSI command length */ |
| unsigned char mx_sb_len; /* [i] max length to write to sbp */ |
| unsigned short iovec_count; /* [i] 0 implies no scatter gather */ |
| unsigned int dxfer_len; /* [i] byte count of data transfer */ |
| void __user *dxferp; /* [i], [*io] points to data transfer memory |
| or scatter gather list */ |
| unsigned char __user *cmdp; /* [i], [*i] points to command to perform */ |
| void __user *sbp; /* [i], [*o] points to sense_buffer memory */ |
| unsigned int timeout; /* [i] MAX_UINT->no timeout (unit: millisec) */ |
| unsigned int flags; /* [i] 0 -> default, see SG_FLAG... */ |
| int pack_id; /* [i->o] unused internally (normally) */ |
| void __user * usr_ptr; /* [i->o] unused internally */ |
| unsigned char status; /* [o] scsi status */ |
| unsigned char masked_status;/* [o] shifted, masked scsi status */ |
| unsigned char msg_status; /* [o] messaging level data (optional) */ |
| unsigned char sb_len_wr; /* [o] byte count actually written to sbp */ |
| unsigned short host_status; /* [o] errors from host adapter */ |
| unsigned short driver_status;/* [o] errors from software driver */ |
| int resid; /* [o] dxfer_len - actual_transferred */ |
| unsigned int duration; /* [o] time taken by cmd (unit: millisec) */ |
| unsigned int info; /* [o] auxiliary information */ |
| } sg_io_hdr_t; /* 64 bytes long (on i386) */ |
| |
| #define SG_INTERFACE_ID_ORIG 'S' |
| |
| /* Use negative values to flag difference from original sg_header structure */ |
| #define SG_DXFER_NONE (-1) /* e.g. a SCSI Test Unit Ready command */ |
| #define SG_DXFER_TO_DEV (-2) /* e.g. a SCSI WRITE command */ |
| #define SG_DXFER_FROM_DEV (-3) /* e.g. a SCSI READ command */ |
| #define SG_DXFER_TO_FROM_DEV (-4) /* treated like SG_DXFER_FROM_DEV with the |
| additional property than during indirect |
| IO the user buffer is copied into the |
| kernel buffers before the transfer */ |
| #define SG_DXFER_UNKNOWN (-5) /* Unknown data direction */ |
| |
| /* following flag values can be "or"-ed together */ |
| #define SG_FLAG_DIRECT_IO 1 /* default is indirect IO */ |
| #define SG_FLAG_UNUSED_LUN_INHIBIT 2 /* default is overwrite lun in SCSI */ |
| /* command block (when <= SCSI_2) */ |
| #define SG_FLAG_MMAP_IO 4 /* request memory mapped IO */ |
| #define SG_FLAG_NO_DXFER 0x10000 /* no transfer of kernel buffers to/from */ |
| /* user space (debug indirect IO) */ |
| /* defaults:: for sg driver: Q_AT_HEAD; for block layer: Q_AT_TAIL */ |
| #define SG_FLAG_Q_AT_TAIL 0x10 |
| #define SG_FLAG_Q_AT_HEAD 0x20 |
| |
| /* following 'info' values are "or"-ed together */ |
| #define SG_INFO_OK_MASK 0x1 |
| #define SG_INFO_OK 0x0 /* no sense, host nor driver "noise" */ |
| #define SG_INFO_CHECK 0x1 /* something abnormal happened */ |
| |
| #define SG_INFO_DIRECT_IO_MASK 0x6 |
| #define SG_INFO_INDIRECT_IO 0x0 /* data xfer via kernel buffers (or no xfer) */ |
| #define SG_INFO_DIRECT_IO 0x2 /* direct IO requested and performed */ |
| #define SG_INFO_MIXED_IO 0x4 /* part direct, part indirect IO */ |
| |
| |
| typedef struct sg_scsi_id { /* used by SG_GET_SCSI_ID ioctl() */ |
| int host_no; /* as in "scsi<n>" where 'n' is one of 0, 1, 2 etc */ |
| int channel; |
| int scsi_id; /* scsi id of target device */ |
| int lun; |
| int scsi_type; /* TYPE_... defined in scsi/scsi.h */ |
| short h_cmd_per_lun;/* host (adapter) maximum commands per lun */ |
| short d_queue_depth;/* device (or adapter) maximum queue length */ |
| int unused[2]; /* probably find a good use, set 0 for now */ |
| } sg_scsi_id_t; /* 32 bytes long on i386 */ |
| |
| typedef struct sg_req_info { /* used by SG_GET_REQUEST_TABLE ioctl() */ |
| char req_state; /* 0 -> not used, 1 -> written, 2 -> ready to read */ |
| char orphan; /* 0 -> normal request, 1 -> from interruped SG_IO */ |
| char sg_io_owned; /* 0 -> complete with read(), 1 -> owned by SG_IO */ |
| char problem; /* 0 -> no problem detected, 1 -> error to report */ |
| int pack_id; /* pack_id associated with request */ |
| void __user *usr_ptr; /* user provided pointer (in new interface) */ |
| unsigned int duration; /* millisecs elapsed since written (req_state==1) |
| or request duration (req_state==2) */ |
| int unused; |
| } sg_req_info_t; /* 20 bytes long on i386 */ |
| |
| |
| /* IOCTLs: Those ioctls that are relevant to the SG 3.x drivers follow. |
| [Those that only apply to the SG 2.x drivers are at the end of the file.] |
| (_GET_s yield result via 'int *' 3rd argument unless otherwise indicated) */ |
| |
| #define SG_EMULATED_HOST 0x2203 /* true for emulated host adapter (ATAPI) */ |
| |
| /* Used to configure SCSI command transformation layer for ATAPI devices */ |
| /* Only supported by the ide-scsi driver */ |
| #define SG_SET_TRANSFORM 0x2204 /* N.B. 3rd arg is not pointer but value: */ |
| /* 3rd arg = 0 to disable transform, 1 to enable it */ |
| #define SG_GET_TRANSFORM 0x2205 |
| |
| #define SG_SET_RESERVED_SIZE 0x2275 /* request a new reserved buffer size */ |
| #define SG_GET_RESERVED_SIZE 0x2272 /* actual size of reserved buffer */ |
| |
| /* The following ioctl has a 'sg_scsi_id_t *' object as its 3rd argument. */ |
| #define SG_GET_SCSI_ID 0x2276 /* Yields fd's bus, chan, dev, lun + type */ |
| /* SCSI id information can also be obtained from SCSI_IOCTL_GET_IDLUN */ |
| |
| /* Override host setting and always DMA using low memory ( <16MB on i386) */ |
| #define SG_SET_FORCE_LOW_DMA 0x2279 /* 0-> use adapter setting, 1-> force */ |
| #define SG_GET_LOW_DMA 0x227a /* 0-> use all ram for dma; 1-> low dma ram */ |
| |
| /* When SG_SET_FORCE_PACK_ID set to 1, pack_id is input to read() which |
| tries to fetch a packet with a matching pack_id, waits, or returns EAGAIN. |
| If pack_id is -1 then read oldest waiting. When ...FORCE_PACK_ID set to 0 |
| then pack_id ignored by read() and oldest readable fetched. */ |
| #define SG_SET_FORCE_PACK_ID 0x227b |
| #define SG_GET_PACK_ID 0x227c /* Yields oldest readable pack_id (or -1) */ |
| |
| #define SG_GET_NUM_WAITING 0x227d /* Number of commands awaiting read() */ |
| |
| /* Yields max scatter gather tablesize allowed by current host adapter */ |
| #define SG_GET_SG_TABLESIZE 0x227F /* 0 implies can't do scatter gather */ |
| |
| #define SG_GET_VERSION_NUM 0x2282 /* Example: version 2.1.34 yields 20134 */ |
| |
| /* Returns -EBUSY if occupied. 3rd argument pointer to int (see next) */ |
| #define SG_SCSI_RESET 0x2284 |
| /* Associated values that can be given to SG_SCSI_RESET follow. |
| * SG_SCSI_RESET_NO_ESCALATE may be OR-ed to the _DEVICE, _TARGET, _BUS |
| * or _HOST reset value so only that action is attempted. */ |
| #define SG_SCSI_RESET_NOTHING 0 |
| #define SG_SCSI_RESET_DEVICE 1 |
| #define SG_SCSI_RESET_BUS 2 |
| #define SG_SCSI_RESET_HOST 3 |
| #define SG_SCSI_RESET_TARGET 4 |
| #define SG_SCSI_RESET_NO_ESCALATE 0x100 |
| |
| /* synchronous SCSI command ioctl, (only in version 3 interface) */ |
| #define SG_IO 0x2285 /* similar effect as write() followed by read() */ |
| |
| #define SG_GET_REQUEST_TABLE 0x2286 /* yields table of active requests */ |
| |
| /* How to treat EINTR during SG_IO ioctl(), only in SG 3.x series */ |
| #define SG_SET_KEEP_ORPHAN 0x2287 /* 1 -> hold for read(), 0 -> drop (def) */ |
| #define SG_GET_KEEP_ORPHAN 0x2288 |
| |
| /* yields scsi midlevel's access_count for this SCSI device */ |
| #define SG_GET_ACCESS_COUNT 0x2289 |
| |
| |
| #define SG_SCATTER_SZ (8 * 4096) |
| /* Largest size (in bytes) a single scatter-gather list element can have. |
| The value used by the driver is 'max(SG_SCATTER_SZ, PAGE_SIZE)'. |
| This value should be a power of 2 (and may be rounded up internally). |
| If scatter-gather is not supported by adapter then this value is the |
| largest data block that can be read/written by a single scsi command. */ |
| |
| #define SG_DEFAULT_RETRIES 0 |
| |
| /* Defaults, commented if they differ from original sg driver */ |
| #define SG_DEF_FORCE_LOW_DMA 0 /* was 1 -> memory below 16MB on i386 */ |
| #define SG_DEF_FORCE_PACK_ID 0 |
| #define SG_DEF_KEEP_ORPHAN 0 |
| #define SG_DEF_RESERVED_SIZE SG_SCATTER_SZ /* load time option */ |
| |
| /* maximum outstanding requests, write() yields EDOM if exceeded */ |
| #define SG_MAX_QUEUE 16 |
| |
| #define SG_BIG_BUFF SG_DEF_RESERVED_SIZE /* for backward compatibility */ |
| |
| /* Alternate style type names, "..._t" variants preferred */ |
| typedef struct sg_io_hdr Sg_io_hdr; |
| typedef struct sg_io_vec Sg_io_vec; |
| typedef struct sg_scsi_id Sg_scsi_id; |
| typedef struct sg_req_info Sg_req_info; |
| |
| |
| /* vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv */ |
| /* The older SG interface based on the 'sg_header' structure follows. */ |
| /* ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ */ |
| |
| #define SG_MAX_SENSE 16 /* this only applies to the sg_header interface */ |
| |
| struct sg_header |
| { |
| int pack_len; /* [o] reply_len (ie useless), ignored as input */ |
| int reply_len; /* [i] max length of expected reply (inc. sg_header) */ |
| int pack_id; /* [io] id number of packet (use ints >= 0) */ |
| int result; /* [o] 0==ok, else (+ve) Unix errno (best ignored) */ |
| unsigned int twelve_byte:1; |
| /* [i] Force 12 byte command length for group 6 & 7 commands */ |
| unsigned int target_status:5; /* [o] scsi status from target */ |
| unsigned int host_status:8; /* [o] host status (see "DID" codes) */ |
| unsigned int driver_status:8; /* [o] driver status+suggestion */ |
| unsigned int other_flags:10; /* unused */ |
| unsigned char sense_buffer[SG_MAX_SENSE]; /* [o] Output in 3 cases: |
| when target_status is CHECK_CONDITION or |
| when target_status is COMMAND_TERMINATED or |
| when (driver_status & DRIVER_SENSE) is true. */ |
| }; /* This structure is 36 bytes long on i386 */ |
| |
| |
| /* IOCTLs: The following are not required (or ignored) when the sg_io_hdr_t |
| interface is used. They are kept for backward compatibility with |
| the original and version 2 drivers. */ |
| |
| #define SG_SET_TIMEOUT 0x2201 /* unit: jiffies (10ms on i386) */ |
| #define SG_GET_TIMEOUT 0x2202 /* yield timeout as _return_ value */ |
| |
| /* Get/set command queuing state per fd (default is SG_DEF_COMMAND_Q. |
| Each time a sg_io_hdr_t object is seen on this file descriptor, this |
| command queuing flag is set on (overriding the previous setting). */ |
| #define SG_GET_COMMAND_Q 0x2270 /* Yields 0 (queuing off) or 1 (on) */ |
| #define SG_SET_COMMAND_Q 0x2271 /* Change queuing state with 0 or 1 */ |
| |
| /* Turn on/off error sense trace (1 and 0 respectively, default is off). |
| Try using: "# cat /proc/scsi/sg/debug" instead in the v3 driver */ |
| #define SG_SET_DEBUG 0x227e /* 0 -> turn off debug */ |
| |
| #define SG_NEXT_CMD_LEN 0x2283 /* override SCSI command length with given |
| number on the next write() on this file descriptor */ |
| |
| |
| /* Defaults, commented if they differ from original sg driver */ |
| #ifdef __KERNEL__ |
| #define SG_DEFAULT_TIMEOUT_USER (60*USER_HZ) /* HZ == 'jiffies in 1 second' */ |
| #else |
| #define SG_DEFAULT_TIMEOUT (60*HZ) /* HZ == 'jiffies in 1 second' */ |
| #endif |
| |
| #define SG_DEF_COMMAND_Q 0 /* command queuing is always on when |
| the new interface is used */ |
| #define SG_DEF_UNDERRUN_FLAG 0 |
| |
| #endif |
