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Appended is a patch to sync <scsi/sg.h> with Linux 2.3.43. The header
still contains the old interface and therefore can be used with Linux
2.2 and 2.3.
Andreas
2000-03-02 Andreas Jaeger <aj@suse.de>
* sysdeps/unix/sysv/linux/scsi/sg.h: Integrate changes from Linux
2.3.43.
============================================================
Index: sysdeps/unix/sysv/linux/scsi/sg.h
--- sysdeps/unix/sysv/linux/scsi/sg.h 1999/11/17 19:53:32 1.3
+++ sysdeps/unix/sysv/linux/scsi/sg.h 2000/03/02 14:30:37
@@ -1,4 +1,4 @@
-/* Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc.
+/* Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@@ -28,12 +28,192 @@
#include <features.h>
-/* An SG device is accessed by writing "packets" to it, the replies
- are then read using the read call. The same header is used for
- replies; ignore the reply_len field. */
-#define SG_MAX_SENSE 16
+/* New interface introduced in the 3.x SG drivers follows */
+/* Same structure as used by readv() Linux system call. It defines one
+ scatter-gather element. */
+typedef struct sg_iovec
+{
+ void * iov_base; /* Starting address */
+ size_t iov_len; /* Length in bytes */
+} sg_iovec_t;
+
+
+typedef struct sg_io_hdr
+{
+ char interface_id; /* [i] 'S' for SCSI generic (required) */
+ unsigned char cmd_len; /* [i] SCSI command length ( <= 16 bytes) */
+ unsigned char iovec_count; /* [i] 0 implies no scatter gather */
+ unsigned char mx_sb_len; /* [i] max length to write to sbp */
+ int dxfer_direction; /* [i] data transfer direction */
+ unsigned int dxfer_len; /* [i] byte count of data transfer */
+ void * dxferp; /* [i], [*io] points to data transfer memory
+ or scatter gather list */
+ unsigned char * cmdp; /* [i], [*i] points to command to perform */
+ unsigned char * 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 * 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 int host_status; /* [o] errors from host adapter */
+ unsigned short int 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;
+
+
+/* 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 */
+
+
+/* following flag values can be "or"-ed together */
+#define SG_FLAG_DIRECT_IO 1 /* default is indirect IO */
+#define SG_FLAG_LUN_INHIBIT 2 /* default is to put device's lun into */
+ /* the 2nd byte of SCSI command */
+#define SG_FLAG_NO_DXFER 0x10000 /* no transfer of kernel buffers to/from */
+ /* user space (debug indirect IO) */
+
+/* The 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 */
+
+
+/* Request information about a specific SG device, used by
+ SG_GET_SCSI_ID ioctl (). */
+struct sg_scsi_id {
+ /* Host number as in "scsi<n>" where 'n' is one of 0, 1, 2 etc. */
+ int host_no;
+ int channel;
+ /* SCSI id of target device. */
+ int scsi_id;
+ int lun;
+ /* TYPE_... defined in <scsi/scsi.h>. */
+ int scsi_type;
+ /* Host (adapter) maximum commands per lun. */
+ short int h_cmd_per_lun;
+ /* Device (or adapter) maximum queue length. */
+ short int d_queue_depth;
+ /* Unused, set to 0 for now. */
+ int unused[2];
+};
+
+/* Used by SG_GET_REQUEST_TABLE ioctl(). */
+typedef struct sg_req_info {
+ 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 * 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;
+
+
+/* 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 else takes as input: 0 -> do nothing,
+ 1 -> device reset or 2 -> bus reset (may not be activated yet) */
+#define SG_SCSI_RESET 0x2284
+
+/* 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
+
+
+#define SG_SCATTER_SZ (8 * 4096) /* PAGE_SIZE not available to user */
+/* Largest size (in bytes) a single scatter-gather list element can have.
+ The value must be a power of 2 and <= (PAGE_SIZE * 32) [131072 bytes on
+ i386]. The minimum value is PAGE_SIZE. If scatter-gather not supported
+ by adapter then this value is the largest data block that can be
+ read/written by a single scsi command. The user can find the value of
+ PAGE_SIZE by calling getpagesize() defined in unistd.h . */
+
+#define SG_DEFAULT_RETRIES 1
+
+/* 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
{
/* Length of incoming packet (including header). */
@@ -61,113 +241,31 @@
unsigned char sense_buffer[SG_MAX_SENSE];
};
-/* Request information about a specific SG device. */
-struct sg_scsi_id {
- /* Host number as in "scsi<n>" where 'n' is one of 0, 1, 2 etc. */
- int host_no;
- int channel;
- /* SCSI id of target device. */
- int scsi_id;
- int lun;
- /* TYPE_... defined in <scsi/scsi.h>. */
- int scsi_type;
- /* Host (adapter) maximum commands per lun. */
- short int h_cmd_per_lun;
- /* Device (or adapter) maximum queue length. */
- short int d_queue_depth;
- /* Unused, set to 0 for now. */
- int unused1;
- /* Unused, set to 0 for now. */
- int unused2;
-};
+
+/* IOCTLs: The following are not required (or ignored) when the sg_io_hdr_t
+ interface is used. That are kept for backward compatibility with
+ the original and version 2 drivers. */
-/* Ioctl's */
#define SG_SET_TIMEOUT 0x2201 /* Set timeout; *(int *)arg==timeout. */
#define SG_GET_TIMEOUT 0x2202 /* Get timeout; return timeout. */
-#define SG_EMULATED_HOST 0x2203 /* True for emulated host adapter (ATAPI). */
-
-/* Used to configure SCSI command transformation layer for ATAPI devices. */
-#define SG_SET_TRANSFORM 0x2204
-#define SG_GET_TRANSFORM 0x2205
-
-#define SG_SET_RESERVED_SIZE 0x2275 /* Request a new reserved buffer size. */
-#define SG_GET_RESERVED_SIZE 0x2272 /* Get actual size of reserved buffer */
-
-/* The following ioctl takes a 'sg_scsi_id *' 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 */
-
-/* If SG_SET_FORCE_PACK_ID is set to 1, pack_id is input to read() which
- will attempt to read that pack_id or block (or return EAGAIN). If
- pack_id is -1 then read oldest waiting. If SG_SET_FORCE_PACK_ID is
- set to 0 then pack_id gets ignored by read() and the oldest
- readable is 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(). */
-
-/* Turn on error sense trace (1..8), dump this device to log/console (9)
- or dump all sg device states ( >9 ) to log/console. */
-#define SG_SET_DEBUG 0x227e /* 0 -> turn off debug */
-
-/* Yields max scatter gather tablesize allowed by current host adapter. */
-#define SG_GET_SG_TABLESIZE 0x227F /* 0 implies can't do scatter gather */
-
-/* Control whether sequencing per file descriptor or per device. */
-#define SG_GET_MERGE_FD 0x2274 /* 0-> per fd, 1-> per device */
-#define SG_SET_MERGE_FD 0x2273 /* Attempt to change sequencing state,
- if more than current fd open on device,
- will fail with EBUSY. */
-
/* Get/set command queuing state per fd (default is SG_DEF_COMMAND_Q). */
#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. */
-/* Get/set whether DMA underrun will cause an error (DID_ERROR). Currently this
- only applies to the [much-used] aic7xxx driver. */
-#define SG_GET_UNDERRUN_FLAG 0x2280 /* Yields 0 (don't flag) or 1 (flag). */
-#define SG_SET_UNDERRUN_FLAG 0x2281 /* Change flag underrun state. */
+/* Turn on error sense trace (1..8), dump this device to log/console (9)
+ or dump all sg device states ( >9 ) to log/console. */
+#define SG_SET_DEBUG 0x227e /* 0 -> turn off debug */
-#define SG_GET_VERSION_NUM 0x2282 /* Example: version 2.1.34 yields 20134 */
#define SG_NEXT_CMD_LEN 0x2283 /* Override SCSI command length with given
number on the next write() on this file
descriptor. */
-/* Returns -EBUSY if occupied else takes as input: 0 -> do nothing,
- 1 -> device reset or 2 -> bus reset (may not be activated yet). */
-#define SG_SCSI_RESET 0x2284
-
-
-/* Largest size (in bytes) a single scatter-gather list element can have.
- The value must be a power of 2 and <= (PAGE_SIZE * 32) [131072 bytes on
- i386]. The minimum value is PAGE_SIZE. If scatter-gather not supported
- by adapter then this value is the largest data block that can be
- read/written by a single scsi command. The user can find the value of
- PAGE_SIZE by calling getpagesize() defined in <unistd.h>. */
-#define SG_SCATTER_SZ (8 * 4096) /* PAGE_SIZE is not available to user. */
-
-#define SG_DEFAULT_TIMEOUT (60 * HZ) /* 1 minute timeout */
-#define SG_DEFAULT_RETRIES 1
-
/* Defaults, commented if they differ from original sg driver */
-#define SG_DEF_COMMAND_Q 0
-#define SG_DEF_MERGE_FD 0 /* was 1 -> per device sequencing */
-#define SG_DEF_FORCE_LOW_DMA 0 /* was 1 -> memory below 16MB on i386 */
-#define SG_DEF_FORCE_PACK_ID 0
-#define SG_DEF_UNDERRUN_FLAG 0
-#define SG_DEF_RESERVED_SIZE SG_SCATTER_SZ
-
-#define SG_MAX_QUEUE 16 /* Maximum outstanding request, arbitrary,
- may be changed if sufficient DMA buffer
- room available. */
+#define SG_DEFAULT_TIMEOUT (60*HZ) /* HZ == 'jiffies in 1 second' */
+#define SG_DEF_COMMAND_Q 0 /* command queuing is always on when
+ the new interface is used */
+#define SG_DEF_UNDERRUN_FLAG 0
-#define SG_BIG_BUFF SG_DEF_RESERVED_SIZE /* for backward compatibility */
#endif /* scsi/sg.h */
--
Andreas Jaeger
SuSE Labs aj@suse.de
private aj@arthur.rhein-neckar.de
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