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author | Srikant Patnaik | 2015-01-11 12:28:04 +0530 |
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committer | Srikant Patnaik | 2015-01-11 12:28:04 +0530 |
commit | 871480933a1c28f8a9fed4c4d34d06c439a7a422 (patch) | |
tree | 8718f573808810c2a1e8cb8fb6ac469093ca2784 /ANDROID_3.4.5/include/scsi/sg.h | |
parent | 9d40ac5867b9aefe0722bc1f110b965ff294d30d (diff) | |
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Moved, renamed, and deleted files
The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.
Diffstat (limited to 'ANDROID_3.4.5/include/scsi/sg.h')
-rw-r--r-- | ANDROID_3.4.5/include/scsi/sg.h | 311 |
1 files changed, 0 insertions, 311 deletions
diff --git a/ANDROID_3.4.5/include/scsi/sg.h b/ANDROID_3.4.5/include/scsi/sg.h deleted file mode 100644 index a9f3c6fc..00000000 --- a/ANDROID_3.4.5/include/scsi/sg.h +++ /dev/null @@ -1,311 +0,0 @@ -#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 - 2006 Douglas Gilbert - - Version: 3.5.34 (20060920) - This version is for 2.6 series kernels. - - For a full changelog see http://www.torque.net/sg - -Map of SG verions to the Linux kernels in which they appear: - ---------- ---------------------------------- - original all kernels < 2.2.6 - 2.1.40 2.2.20 - 3.0.x optional version 3 sg driver for 2.2 series - 3.1.17++ 2.4.0++ - 3.5.30++ 2.6.0++ - -Major new features in SG 3.x driver (cf SG 2.x drivers) - - SG_IO ioctl() combines function if write() and read() - - new interface (sg_io_hdr_t) but still supports old interface - - scatter/gather in user space, direct IO, and mmap supported - - The normal action of this driver is to use the adapter (HBA) driver to DMA - data into kernel buffers and then use the CPU to copy the data into the - user space (vice versa for writes). That is called "indirect" IO due to - the double handling of data. There are two methods offered to remove the - redundant copy: 1) direct IO and 2) using the mmap() system call to map - the reserve buffer (this driver has one reserve buffer per fd) into the - user space. Both have their advantages. - In terms of absolute speed mmap() is faster. If speed is not a concern, - indirect IO should be fine. Read the documentation for more information. - - ** N.B. To use direct IO 'echo 1 > /proc/scsi/sg/allow_dio' or - 'echo 1 > /sys/module/sg/parameters/allow_dio' is needed. - That attribute is 0 by default. ** - - Historical note: this SCSI pass-through driver has been known as "sg" for - a decade. In broader kernel discussions "sg" is used to refer to scatter - gather techniques. The context should clarify which "sg" is referred to. - - Documentation - ============= - A web site for the SG device driver can be found at: - http://www.torque.net/sg [alternatively check the MAINTAINERS file] - The documentation for the sg version 3 driver can be found at: - http://www.torque.net/sg/p/sg_v3_ho.html - This is a rendering from DocBook source [change the extension to "sgml" - or "xml"]. There are renderings in "ps", "pdf", "rtf" and "txt" (soon). - The SG_IO ioctl is now found in other parts kernel (e.g. the block layer). - For more information see http://www.torque.net/sg/sg_io.html - - The older, version 2 documents discuss the original sg interface in detail: - http://www.torque.net/sg/p/scsi-generic.txt - http://www.torque.net/sg/p/scsi-generic_long.txt - Also available: <kernel_source>/Documentation/scsi/scsi-generic.txt - - Utility and test programs are available at the sg web site. They are - packaged as sg3_utils (for the lk 2.4 and 2.6 series) and sg_utils - (for the lk 2.2 series). -*/ - -#ifdef __KERNEL__ -extern int sg_big_buff; /* for sysctl */ -#endif - -/* New interface introduced in the 3.x SG drivers follows */ - -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 ( <= 16 bytes) */ - 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) */ - -/* 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 */ -#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 - -/* 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 |