-/* Copyright (C) 1997, 1998 Free Software Foundation, Inc.
+/* Copyright (C) 1997, 1998, 1999 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
are then read using the read call. The same header is used for
replies; ignore the reply_len field. */
+#define SG_MAX_SENSE 16
+
struct sg_header
{
- int pack_len; /* length of incoming packet
- (including header). */
- int reply_len; /* max length of expected reply. */
- int pack_id; /* id number of packet. */
- int result; /* 0==ok, otherwise error number. */
- unsigned int twelve_byte:1; /* force 12 byte command length for
- group 6 & 7 commands. */
- unsigned int other_flags:31; /* for future use. */
- unsigned char sense_buffer[16]; /* used only by reads. */
- /* command follows then data for command. */
+ /* Length of incoming packet (including header). */
+ int pack_len;
+ /* Maximal length of expected reply. */
+ int reply_len;
+ /* Id number of packet. */
+ int pack_id;
+ /* 0==ok, otherwise error number. */
+ int result;
+ /* Force 12 byte command length for group 6 & 7 commands. */
+ unsigned int twelve_byte:1;
+ /* SCSI status from target. */
+ unsigned int target_status:5;
+ /* Host status (see "DID" codes). */
+ unsigned int host_status:8;
+ /* Driver status+suggestion. */
+ unsigned int driver_status:8;
+ /* Unused. */
+ unsigned int other_flags:10;
+ /* 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. */
+ unsigned char sense_buffer[SG_MAX_SENSE];
};
-/* ioctl's */
-#define SG_SET_TIMEOUT 0x2201 /* set timeout *(int *)arg==timeout */
-#define SG_GET_TIMEOUT 0x2202 /* get timeout return timeout */
+/* 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;
+};
+
+/* 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. */
+
+#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
-#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 4 /* maximum outstanding request, arbitrary, may be
- changed if sufficient DMA buffer room available. */
+#define SG_MAX_QUEUE 16 /* Maximum outstanding request, arbitrary,
+ may be changed if sufficient DMA buffer
+ room available. */
-#define SG_BIG_BUFF 32768
+#define SG_BIG_BUFF SG_DEF_RESERVED_SIZE /* for backward compatibility */
#endif /* scsi/sg.h */
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