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Message-ID: <4B45F6C5.2040101@panasas.com>
Date: Thu, 07 Jan 2010 16:59:17 +0200
From: Boaz Harrosh <bharrosh@...asas.com>
To: James Bottomley <James.Bottomley@...e.de>
CC: Peter Korsgaard <jacmet@...site.dk>, james.smart@...lex.com,
linux-scsi@...r.kernel.org, akpm@...ux-foundation.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH,RESEND] scsi: use __uX types for headers exported to user
space
On 01/07/2010 04:40 PM, James Bottomley wrote:
> On Thu, 2010-01-07 at 15:20 +0100, Peter Korsgaard wrote:
>> Commit 9e4f5e29 (FC Pass Thru support) exported a number of header files
>> in include/scsi to user space, but didn't change the uX types to the
>> userspace-compatible __uX types. Without that you'll get compile errors
>> when including them - E.G.:
>>
>> /tmp/include/scsi/scsi.h:145: error: expected specifier-qualifier-list
>> before ‘u8’
>>
>> Signed-off-by: Peter Korsgaard <jacmet@...site.dk>
>> ---
>> No feedback since 27/11, resending.
>
> OK, so to summarise the list discussion, the current status is that the
> SCSI exports are irrelevant because glibc currently ignores the
> include/scsi namespace provided by the kernel. So, we have three
> options:
>
> 1. Bring our exports up to the point where they can replace glibc's
> include/scsi/scsi.h and the rest. This requires a line by line
> analysis of what's in glibc and an update to our include to
> provide or remove as necessary. After this is done we can try
> to persuade the glibc people to turn over the include/scsi
> namespace to us.
> 2. Kill the kbuild exports and make everyone go via the glibc tree
> (current state).
> 3. Move the kernel include/scsi to a more conventional namespace
> (like inside include/linux) so glibc will pick it up.
>
> So far we've had people supporting all three. I'm inclined to say that
> I'd favour 1, but the first patch trying to do any of them would be the
> best starting ground for a discussion.
>
> James
>
Below is a diff of make headers_check on current scsi.h
(After my patch, see other mail in thread)
And /usr/include/scsi.h from a Fedora12 system.
Clearly this is an old version of a Linux header.
Except one minor name conflict I do not see any problems at all
It is all additions (+) to that old version.
The single existing issue is:
-#define ABORT 0x06
+#define ABORT_TASK_SET 0x06
Which is correct surly "#define ABORT" is a disastrous name space
pollution.
Boaz
---
diff -Nurp -Nurp /usr/include/scsi/scsi.h .build_x86_64/usr/include/scsi/scsi.h
--- /usr/include/scsi/scsi.h 2010-01-04 15:50:26.000000000 +0200
+++ .build_x86_64/usr/include/scsi/scsi.h 2010-01-07 16:47:45.943919303 +0200
@@ -1,30 +1,14 @@
-/* Copyright (C) 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
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
-
/*
* This header file contains public constants and structures used by
* the scsi code for linux.
+ *
+ * For documentation on the OPCODES, MESSAGES, and SENSE values,
+ * please consult the SCSI standard.
*/
-
#ifndef _SCSI_SCSI_H
-#define _SCSI_SCSI_H 1
+#define _SCSI_SCSI_H
-#include <features.h>
+#include <linux/types.h>
/*
* SCSI opcodes
@@ -36,6 +20,7 @@
#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
@@ -60,6 +45,7 @@
#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
@@ -81,16 +67,23 @@
#define WRITE_LONG 0x3f
#define CHANGE_DEFINITION 0x40
#define WRITE_SAME 0x41
+#define UNMAP 0x42
#define READ_TOC 0x43
#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 MAINTENANCE_IN 0xa3
+#define MAINTENANCE_OUT 0xa4
#define MOVE_MEDIUM 0xa5
+#define EXCHANGE_MEDIUM 0xa6
#define READ_12 0xa8
#define WRITE_12 0xaa
#define WRITE_VERIFY_12 0xae
@@ -100,9 +93,93 @@
#define READ_ELEMENT_STATUS 0xb8
#define SEND_VOLUME_TAG 0xb6
#define WRITE_LONG_2 0xea
+#define READ_16 0x88
+#define WRITE_16 0x8a
+#define VERIFY_16 0x8f
+#define WRITE_SAME_16 0x93
+#define SERVICE_ACTION_IN 0x9e
+/* values for service action in */
+#define SAI_READ_CAPACITY_16 0x10
+#define SAI_GET_LBA_STATUS 0x12
+/* values for maintenance in */
+#define MI_REPORT_TARGET_PGS 0x0a
+/* values for maintenance out */
+#define MO_SET_TARGET_PGS 0x0a
+/* values for variable length command */
+#define READ_32 0x09
+#define WRITE_32 0x0b
+#define WRITE_SAME_32 0x0d
+
+/* Values for T10/04-262r7 */
+#define ATA_16 0x85 /* 16-byte pass-thru */
+#define ATA_12 0xa1 /* 12-byte pass-thru */
+
+/*
+ * 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 */
+};
+
+static __inline__ unsigned
+scsi_varlen_cdb_length(const void *hdr)
+{
+ return ((struct scsi_varlen_cdb_hdr *)hdr)->additional_cdb_length + 8;
+}
+
+/*
+ * SCSI Architecture Model (SAM) Status codes. Taken from SAM-3 draft
+ * T10/1561-D Revision 4 Draft dated 7th November 2002.
+ */
+#define SAM_STAT_GOOD 0x00
+#define SAM_STAT_CHECK_CONDITION 0x02
+#define SAM_STAT_CONDITION_MET 0x04
+#define SAM_STAT_BUSY 0x08
+#define SAM_STAT_INTERMEDIATE 0x10
+#define SAM_STAT_INTERMEDIATE_CONDITION_MET 0x14
+#define SAM_STAT_RESERVATION_CONFLICT 0x18
+#define SAM_STAT_COMMAND_TERMINATED 0x22 /* obsolete in SAM-3 */
+#define SAM_STAT_TASK_SET_FULL 0x28
+#define SAM_STAT_ACA_ACTIVE 0x30
+#define SAM_STAT_TASK_ABORTED 0x40
+
+/** scsi_status_is_good - check the status return.
+ *
+ * @status: the status passed up from the driver (including host and
+ * driver components)
+ *
+ * This returns true for known good conditions that may be treated as
+ * command completed normally
+ */
+static __inline__ int scsi_status_is_good(int status)
+{
+ /*
+ * FIXME: bit0 is listed as reserved in SCSI-2, but is
+ * significant in SCSI-3. For now, we follow the SCSI-2
+ * behaviour and ignore reserved bits.
+ */
+ status &= 0xfe;
+ return ((status == SAM_STAT_GOOD) ||
+ (status == SAM_STAT_INTERMEDIATE) ||
+ (status == SAM_STAT_INTERMEDIATE_CONDITION_MET) ||
+ /* FIXME: this is obsolete in SAM-3 */
+ (status == SAM_STAT_COMMAND_TERMINATED));
+}
/*
- * Status codes
+ * Status codes. These are deprecated as they are shifted 1 bit right
+ * from those found in the SCSI standards. This causes confusion for
+ * applications that are ported to several OSes. Prefer SAM Status codes
+ * above.
*/
#define GOOD 0x00
@@ -114,8 +191,10 @@
#define RESERVATION_CONFLICT 0x0c
#define COMMAND_TERMINATED 0x11
#define QUEUE_FULL 0x14
+#define ACA_ACTIVE 0x18
+#define TASK_ABORTED 0x20
-#define STATUS_MASK 0x3e
+#define STATUS_MASK 0xfe
/*
* SENSE KEYS
@@ -138,43 +217,79 @@
/*
* 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 -
+#define TYPE_MOD 0x07 /* Magneto-optical disk -
* - treated as TYPE_DISK */
#define TYPE_MEDIUM_CHANGER 0x08
-#define TYPE_ENCLOSURE 0x0d /* Enclosure Services Device */
+#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_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 */
+};
+
/*
* standard mode-select header prepended to all mode-select commands
- *
- * moved here from cdrom.h -- kraxel
*/
-struct ccs_modesel_head
- {
- unsigned char _r1; /* reserved. */
- unsigned char medium; /* device-specific medium type. */
- unsigned char _r2; /* reserved. */
- unsigned char block_desc_length; /* block descriptor length. */
- unsigned char density; /* device-specific density code. */
- unsigned char number_blocks_hi; /* number of blocks in this block
- desc. */
- unsigned char number_blocks_med;
- unsigned char number_blocks_lo;
- unsigned char _r3;
- unsigned char block_length_hi; /* block length for blocks in this
- desc. */
- unsigned char block_length_med;
- unsigned char block_length_lo;
- };
+struct ccs_modesel_head {
+ __u8 _r1; /* reserved */
+ __u8 medium; /* device-specific medium type */
+ __u8 _r2; /* reserved */
+ __u8 block_desc_length; /* block descriptor length */
+ __u8 density; /* device-specific density code */
+ __u8 number_blocks_hi; /* number of blocks in this block desc */
+ __u8 number_blocks_med;
+ __u8 number_blocks_lo;
+ __u8 _r3;
+ __u8 block_length_hi; /* block length for blocks in this desc */
+ __u8 block_length_med;
+ __u8 block_length_lo;
+};
+
+/*
+ * ScsiLun: 8 byte LUN.
+ */
+struct scsi_lun {
+ __u8 scsi_lun[8];
+};
+
+/*
+ * The Well Known LUNS (SAM-3) in our int representation of a LUN
+ */
+#define SCSI_W_LUN_BASE 0xc100
+#define SCSI_W_LUN_REPORT_LUNS (SCSI_W_LUN_BASE + 1)
+#define SCSI_W_LUN_ACCESS_CONTROL (SCSI_W_LUN_BASE + 2)
+#define SCSI_W_LUN_TARGET_LOG_PAGE (SCSI_W_LUN_BASE + 3)
+
+static __inline__ int scsi_is_wlun(unsigned int lun)
+{
+ return (lun & 0xff00) == SCSI_W_LUN_BASE;
+}
+
/*
* MESSAGE CODES
@@ -186,41 +301,179 @@ struct ccs_modesel_head
#define EXTENDED_SDTR 0x01
#define EXTENDED_EXTENDED_IDENTIFY 0x02 /* SCSI-I only */
#define EXTENDED_WDTR 0x03
+#define EXTENDED_PPR 0x04
+#define EXTENDED_MODIFY_BIDI_DATA_PTR 0x05
#define SAVE_POINTERS 0x02
#define RESTORE_POINTERS 0x03
#define DISCONNECT 0x04
#define INITIATOR_ERROR 0x05
-#define ABORT 0x06
+#define ABORT_TASK_SET 0x06
#define MESSAGE_REJECT 0x07
#define NOP 0x08
#define MSG_PARITY_ERROR 0x09
#define LINKED_CMD_COMPLETE 0x0a
#define LINKED_FLG_CMD_COMPLETE 0x0b
-#define BUS_DEVICE_RESET 0x0c
-
+#define TARGET_RESET 0x0c
+#define ABORT_TASK 0x0d
+#define CLEAR_TASK_SET 0x0e
#define INITIATE_RECOVERY 0x0f /* SCSI-II only */
#define RELEASE_RECOVERY 0x10 /* SCSI-II only */
-
+#define CLEAR_ACA 0x16
+#define LOGICAL_UNIT_RESET 0x17
#define SIMPLE_QUEUE_TAG 0x20
#define HEAD_OF_QUEUE_TAG 0x21
#define ORDERED_QUEUE_TAG 0x22
+#define IGNORE_WIDE_RESIDUE 0x23
+#define ACA 0x24
+#define QAS_REQUEST 0x55
+
+/* Old SCSI2 names, don't use in new code */
+#define BUS_DEVICE_RESET TARGET_RESET
+#define ABORT ABORT_TASK_SET
+
+/*
+ * Host byte codes
+ */
+
+#define DID_OK 0x00 /* NO error */
+#define DID_NO_CONNECT 0x01 /* Couldn't connect before timeout period */
+#define DID_BUS_BUSY 0x02 /* BUS stayed busy through time out period */
+#define DID_TIME_OUT 0x03 /* TIMED OUT for other reason */
+#define DID_BAD_TARGET 0x04 /* BAD target. */
+#define DID_ABORT 0x05 /* Told to abort for some other reason */
+#define DID_PARITY 0x06 /* Parity error */
+#define DID_ERROR 0x07 /* Internal error */
+#define DID_RESET 0x08 /* Reset by somebody. */
+#define DID_BAD_INTR 0x09 /* Got an interrupt we weren't expecting. */
+#define DID_PASSTHROUGH 0x0a /* Force command past mid-layer */
+#define DID_SOFT_ERROR 0x0b /* The low level driver just wish a retry */
+#define DID_IMM_RETRY 0x0c /* Retry without decrementing retry count */
+#define DID_REQUEUE 0x0d /* Requeue command (no immediate retry) also
+ * without decrementing the retry count */
+#define DID_TRANSPORT_DISRUPTED 0x0e /* Transport error disrupted execution
+ * and the driver blocked the port to
+ * recover the link. Transport class will
+ * retry or fail IO */
+#define DID_TRANSPORT_FAILFAST 0x0f /* Transport class fastfailed the io */
+#define DRIVER_OK 0x00 /* Driver status */
+
+/*
+ * These indicate the error that occurred, and what is available.
+ */
+
+#define DRIVER_BUSY 0x01
+#define DRIVER_SOFT 0x02
+#define DRIVER_MEDIA 0x03
+#define DRIVER_ERROR 0x04
+
+#define DRIVER_INVALID 0x05
+#define DRIVER_TIMEOUT 0x06
+#define DRIVER_HARD 0x07
+#define DRIVER_SENSE 0x08
+
+/*
+ * Internal return values.
+ */
+
+#define NEEDS_RETRY 0x2001
+#define SUCCESS 0x2002
+#define FAILED 0x2003
+#define QUEUED 0x2004
+#define SOFT_ERROR 0x2005
+#define ADD_TO_MLQUEUE 0x2006
+#define TIMEOUT_ERROR 0x2007
+#define SCSI_RETURN_NOT_HANDLED 0x2008
+
+/*
+ * Midlevel queue return values.
+ */
+#define SCSI_MLQUEUE_HOST_BUSY 0x1055
+#define SCSI_MLQUEUE_DEVICE_BUSY 0x1056
+#define SCSI_MLQUEUE_EH_RETRY 0x1057
+#define SCSI_MLQUEUE_TARGET_BUSY 0x1058
+
+/*
+ * Use these to separate status msg and our bytes
+ *
+ * These are set by:
+ *
+ * status byte = set from target device
+ * msg_byte = return status from host adapter itself.
+ * host_byte = set by low-level driver to indicate status.
+ * driver_byte = set by mid-level.
+ */
+#define status_byte(result) (((result) >> 1) & 0x7f)
+#define msg_byte(result) (((result) >> 8) & 0xff)
+#define host_byte(result) (((result) >> 16) & 0xff)
+#define driver_byte(result) (((result) >> 24) & 0xff)
+
+#define sense_class(sense) (((sense) >> 4) & 0x7)
+#define sense_error(sense) ((sense) & 0xf)
+#define sense_valid(sense) ((sense) & 0x80);
+
+/*
+ * default timeouts
+*/
+#define FORMAT_UNIT_TIMEOUT (2 * 60 * 60 * HZ)
+#define START_STOP_TIMEOUT (60 * HZ)
+#define MOVE_MEDIUM_TIMEOUT (5 * 60 * HZ)
+#define READ_ELEMENT_STATUS_TIMEOUT (5 * 60 * HZ)
+#define READ_DEFECT_DATA_TIMEOUT (60 * HZ )
+
+
+#define IDENTIFY_BASE 0x80
+#define IDENTIFY(can_disconnect, lun) (IDENTIFY_BASE |\
+ ((can_disconnect) ? 0x40 : 0) |\
+ ((lun) & 0x07))
+
+/*
+ * struct scsi_device::scsi_level values. For SCSI devices other than those
+ * prior to SCSI-2 (i.e. over 12 years old) this value is (resp[2] + 1)
+ * where "resp" is a byte array of the response to an INQUIRY. The scsi_level
+ * variable is visible to the user via sysfs.
+ */
+
+#define SCSI_UNKNOWN 0
+#define SCSI_1 1
+#define SCSI_1_CCS 2
+#define SCSI_2 3
+#define SCSI_3 4 /* SPC */
+#define SCSI_SPC_2 5
+#define SCSI_SPC_3 6
+
+/*
+ * INQ PERIPHERAL QUALIFIERS
+ */
+#define SCSI_INQ_PQ_CON 0x00
+#define SCSI_INQ_PQ_NOT_CON 0x01
+#define SCSI_INQ_PQ_NOT_CAP 0x03
+
/*
* Here are some scsi specific ioctl commands which are sometimes useful.
+ *
+ * Note that include/linux/cdrom.h also defines IOCTL 0x5300 - 0x5395
*/
-/* These are a few other constants only used by scsi devices. */
-#define SCSI_IOCTL_GET_IDLUN 0x5382
+/* Used to obtain PUN and LUN info. Conflicts with CDROMAUDIOBUFSIZ */
+#define SCSI_IOCTL_GET_IDLUN 0x5382
+
+/* 0x5383 and 0x5384 were used for SCSI_IOCTL_TAGGED_{ENABLE,DISABLE} */
+
+/* Used to obtain the host number of a device. */
+#define SCSI_IOCTL_PROBE_HOST 0x5385
-/* Used to turn on and off tagged queuing for scsi devices. */
+/* Used to obtain the bus number for a device */
+#define SCSI_IOCTL_GET_BUS_NUMBER 0x5386
-#define SCSI_IOCTL_TAGGED_ENABLE 0x5383
-#define SCSI_IOCTL_TAGGED_DISABLE 0x5384
+/* Used to obtain the PCI location of a device */
+#define SCSI_IOCTL_GET_PCI 0x5387
-/* Used to obtain the host number of a device. */
-#define SCSI_IOCTL_PROBE_HOST 0x5385
+/* Pull a u32 out of a SCSI message (using BE SCSI conventions) */
+static __inline__ __u32 scsi_to_u32(__u8 *ptr)
+{
+ return (ptr[0]<<24) + (ptr[1]<<16) + (ptr[2]<<8) + ptr[3];
+}
-/* Used to get the bus number for a device. */
-#define SCSI_IOCTL_GET_BUS_NUMBER 0x5386
-#endif /* scsi/scsi.h */
+#endif /* _SCSI_SCSI_H */
--
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