megaraid.c

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/*===================================================================
 *
 *                    Linux MegaRAID device driver
 *
 * Copyright 2001  American Megatrends Inc.
 *
 *              This program is free software; you can redistribute it and/or
 *              modify it under the terms of the GNU General Public License
 *              as published by the Free Software Foundation; either version
 *              2 of the License, or (at your option) any later version.
 *
 * Version : v1.18 (Oct 11, 2001)
 *
 * Description: Linux device driver for LSI Logic MegaRAID controller
 *
 * Supported controllers: MegaRAID 418, 428, 438, 466, 762, 467, 471, 490
 *                                      493.
 * History:
 *
 * Version 0.90:
 *     Original source contributed by Dell; integrated it into the kernel and
 *     cleaned up some things.  Added support for 438/466 controllers.
 * Version 0.91:
 *     Aligned mailbox area on 16-byte boundary.
 *     Added schedule() at the end to properly clean up.
 *     Made improvements for conformity to linux driver standards.
 *
 * Version 0.92:
 *     Added support for 2.1 kernels.
 *         Reads from pci_dev struct, so it's not dependent on pcibios.
 *         Added some missing virt_to_bus() translations.
 *     Added support for SMP.
 *         Changed global cli()'s to spinlocks for 2.1, and simulated
 *          spinlocks for 2.0.
 *     Removed setting of SA_INTERRUPT flag when requesting Irq.
 *
 * Version 0.92ac:
 *     Small changes to the comments/formatting. Plus a couple of
 *      added notes. Returned to the authors. No actual code changes
 *      save printk levels.
 *     8 Oct 98        Alan Cox <[e-mail]>
 *
 *     Merged with 2.1.131 source tree.
 *     12 Dec 98       K. Baranowski <[e-mail]>
 *
 * Version 0.93:
 *     Added support for vendor specific ioctl commands (M_RD_IOCTL_CMD+xxh)
 *     Changed some fields in MEGARAID struct to better values.
 *     Added signature check for Rp controllers under 2.0 kernels
 *     Changed busy-wait loop to be time-based
 *     Fixed SMP race condition in isr
 *     Added kfree (sgList) on release
 *     Added #include linux/version.h to megaraid.h for hosts.h
 *     Changed max_id to represent max logical drives instead of targets.
 *
 * Version 0.94:
 *     Got rid of some excess locking/unlocking
 *     Fixed slight memory corruption problem while memcpy'ing into mailbox
 *     Changed logical drives to be reported as luns rather than targets
 *     Changed max_id to 16 since it is now max targets/chan again.
 *     Improved ioctl interface for upcoming megamgr
 *
 * Version 0.95:
 *     Fixed problem of queueing multiple commands to adapter;
 *       still has some strange problems on some setups, so still
 *       defaults to single.  To enable parallel commands change
 *       #define MULTI_IO in megaraid.h
 *     Changed kmalloc allocation to be done in beginning.
 *     Got rid of C++ style comments
 *
 * Version 0.96:
 *     762 fully supported.
 *
 * Version 0.97:
 *     Changed megaraid_command to use wait_queue.
 *
 * Version 1.00:
 *     Checks to see if an irq occurred while in isr, and runs through
 *       routine again.
 *     Copies mailbox to temp area before processing in isr
 *     Added barrier() in busy wait to fix volatility bug
 *     Uses separate list for freed Scbs, keeps track of cmd state
 *     Put spinlocks around entire queue function for now...
 *     Full multi-io commands working stablely without previous problems
 *     Added skipXX LILO option for Madrona motherboard support
 *
 * Version 1.01:
 *     Fixed bug in mega_cmd_done() for megamgr control commands,
 *       the host_byte in the result code from the scsi request to
 *       scsi midlayer is set to DID_BAD_TARGET when adapter's
 *       returned codes are 0xF0 and 0xF4.
 *
 * Version 1.02:
 *     Fixed the tape drive bug by extending the adapter timeout value
 *       for passthrough command to 60 seconds in mega_build_cmd().
 *
 * Version 1.03:
 *    Fixed Madrona support.
 *    Changed the adapter timeout value from 60 sec in 1.02 to 10 min
 *      for bigger and slower tape drive.
 *    Added driver version printout at driver loadup time
 *
 * Version 1.04
 *    Added code for 40 ld FW support.
 *    Added new ioctl command 0x81 to support NEW_READ/WRITE_CONFIG with
 *      data area greater than 4 KB, which is the upper bound for data
 *      tranfer through scsi_ioctl interface.
 *    The additional 32 bit field for 64bit address in the newly defined
 *      mailbox64 structure is set to 0 at this point.
 *
 * Version 1.05
 *    Changed the queing implementation for handling SCBs and completed
 *      commands.
 *    Added spinlocks in the interrupt service routine to enable the driver
 *      function in the SMP environment.
 *    Fixed the problem of unnecessary aborts in the abort entry point, which
 *      also enables the driver to handle large amount of I/O requests for
 *      long duration of time.
 * Version 1.06
 *              Intel Release
 * Version 1.07
 *    Removed the usage of uaccess.h file for kernel versions less than
 *    2.0.36, as this file is not present in those versions.
 *
 * Version 108
 *    Modified mega_ioctl so that 40LD megamanager would run
 *    Made some changes for 2.3.XX compilation , esp wait structures
 *    Code merge between 1.05 and 1.06 .
 *    Bug fixed problem with ioctl interface for concurrency between
 *    8ld and 40ld firwmare
 *    Removed the flawed semaphore logic for handling new config command
 *    Added support for building own scatter / gather list for big user
 *    mode buffers
 *    Added /proc file system support ,so that information is available in
 *    human readable format
 *
 * Version 1a08
 *    Changes for IA64 kernels. Checked for CONFIG_PROC_FS flag
 *
 * Version 1b08
 *    Include file changes.
 * Version 1b08b
 *    Change PCI ID value for the 471 card, use #defines when searching
 *    for megaraid cards.
 *
 * Version 1.10
 *
 *      I) Changes made to make following ioctl commands work in 0x81 interface
 *              a)DCMD_DELETE_LOGDRV
 *              b)DCMD_GET_DISK_CONFIG
 *              c)DCMD_DELETE_DRIVEGROUP
 *              d)NC_SUBOP_ENQUIRY3
 *              e)DCMD_CHANGE_LDNO
 *              f)DCMD_CHANGE_LOOPID
 *              g)DCMD_FC_READ_NVRAM_CONFIG
 *      h)DCMD_WRITE_CONFIG
 *      II) Added mega_build_kernel_sg function
 *  III)Firmware flashing option added
 *
 * Version 1.10a
 *
 *      I)Dell updates included in the source code.
 *              Note:   This change is not tested due to the unavailability of IA64 kernel
 *      and it is in the #ifdef DELL_MODIFICATION macro which is not defined
 *
 * Version 1.10b
 *
 *      I)In M_RD_IOCTL_CMD_NEW command the wrong way of copying the data
 *    to the user address corrected
 *
 * Version 1.10c
 *
 *      I) DCMD_GET_DISK_CONFIG opcode updated for the firmware changes.
 *
 * Version 1.11
 *      I)  Version number changed from 1.10c to 1.11
 *  II) DCMD_WRITE_CONFIG(0x0D) command in the driver changed from
 *      scatter/gather list mode to direct pointer mode..
 *     Fixed bug of undesirably detecting HP onboard controllers which
 *       are disabled.
 *
 *      Version 1.12 (Sep 21, 2000)
 *
 *     I. Changes have been made for Dynamic DMA mapping in IA64 platform.
 *                To enable all these changes define M_RD_DYNAMIC_DMA_SUPPORT in megaraid.h
 *        II. Got rid of windows mode comments
 *       III. Removed unwanted code segments
 *    IV. Fixed bug of HP onboard controller information (commented with
 *                 MEGA_HP_FIX)
 *
 *      Version 1a12
 *      I.      reboot notifier and new ioctl changes ported from 1c09
 *
 *      Version 1b12
 *      I.      Changes in new ioctl interface routines ( Nov 06, 2000 )
 *
 *      Version 1c12
 *      I.      Changes in new ioctl interface routines ( Nov 07, 2000 )
 *
 *      Version 1d12
 *      I.      Compilation error under kernel 2.4.0 for 32-bit machine in mega_ioctl
 *
 *      Version 1e12, 1f12
 *      1.  Fixes for pci_map_single, pci_alloc_consistent along with mailbox
 *          alignment
 *
 *	Version 1.13beta
 *	Added Support for Full 64bit address space support. If firmware
 *	supports 64bit, it goes to 64 bit mode even on x86 32bit 
 *	systems. Data Corruption Issues while running on test9 kernel
 *	on IA64 systems. This issue not seen on test11 on x86 system
 *
 *	Version 1.13c
 *	1. Resolved Memory Leak when using M_RD_IOCTL_CMD interface
 *	2. Resolved Queuing problem when MailBox Blocks
 *	3. Added unregister_reboot_notifier support
 * 
 *	Version 1.13d
 *	Experimental changes in interfacing with the controller in ISR
 *
 *	Version 1.13e
 *	Fixed Broken 2.2.XX compilation changes + misc changes
 *
 *	Version 1.13f to 1.13i
 *	misc changes + code clean up
 *	Cleaned up the ioctl code and added set_mbox_xfer_addr()
 *	Support for START_DEV (6)
 * 	
 *	Version 1.13j
 *	Moved some code to megaraid.h file, replaced some hard coded values 
 *      with respective macros. Changed some functions to static
 *
 *	Version 1.13k
 *	Only some idendation correction to 1.13j 
 *
 *	Version 1.13l , 1.13m, 1.13n, 1.13o
 *	Minor Identation changes + misc changes
 *
 *	Version 1.13q
 *	Paded the new uioctl_t MIMD structure for maintaining alignment 
 *	and size across 32 / 64 bit platforms
 *	Changed the way MIMD IOCTL interface used virt_to_bus() to use pci
 *	memory location
 *
 *	Version 1.13r
 *	2.4.xx SCSI Changes.
 *
 *	Version 1.13s
 *	Stats counter fixes
 *	Temporary fix for some 64 bit firmwares in 2.4.XX kernels
 *
 *	Version	1.13t
 *	Support for 64bit version of READ/WRITE/VIEW DISK CONFIG
 *
 *	Version 1.14
 *	Did away with MEGADEV_IOCTL flag. It is now standard part of driver
 *	without need for a special #define flag
 *	Disabled old scsi ioctl path for kernel versions > 2.3.xx. This is due
 *	to the nature in which the new scsi code queues a new scsi command to 
 *	controller during SCSI IO Completion
 *	Driver now checks for sub-system vendor id before taking ownership of
 *	the controller
 *
 *	Version 1.14a
 *	Added Host re-ordering
 *
 *	Version 1.14b
 *	Corrected some issue which caused the older cards not to work
 *	
 *	Version 1.14c
 *	IOCTL changes for not handling the non-64bit firmwares under 2.4.XX
 *	kernel
 *
 *	Version 1.14d
 *	Fixed Various MIMD Synchronization Issues
 *	
 *	Version 1.14e
 *	Fixed the error handling during card initialization
 *
 *	Version 1.14f
 *	Multiple invocations of mimd phase I ioctl stalls the cpu. Replaced
 *	spinlock with semaphore(mutex)
 *
 *	Version 1.14g
 *	Fixed running out of scbs issues while running MIMD apps under heavy IO
 *
 *	Version 1.14g-ac - 02/03/01
 *	Reformatted to Linux format so I could compare to old one and cross
 *	check bug fixes
 *	Re fixed the assorted missing 'static' cases
 *	Removed some unneeded version checks
 *	Cleaned up some of the VERSION checks in the code
 *	Left 2.0 support but removed 2.1.x support.
 *	Collected much of the compat glue into one spot
 *
 *	Version 1.14g-ac2 - 22/03/01
 *	Fixed a non obvious dereference after free in the driver unload path
 *
 *	Version 1.14i
 *	changes for making 32bit application run on IA64
 *
 *	Version 1.14j
 *	Tue Mar 13 14:27:54 EST 2001 - AM
 *	Changes made in the driver to be able to run applications if the
 *	system has memory >4GB.
 *
 *
 *	Version 1.14k
 *	Thu Mar 15 18:38:11 EST 2001 - AM
 *
 *	Firmware version check removed if subsysid==0x1111 and
 *	subsysvid==0x1111, since its not yet initialized.
 *
 *	changes made to correctly calculate the base in mega_findCard.
 *
 *	Driver informational messages now appear on the console as well as
 *	with dmesg
 *
 *	Older ioctl interface is returned failure on newer(2.4.xx) kernels.
 *
 *	Inclusion of "modversions.h" is still a debatable question. It is
 *	included anyway with this release.
 *
 *	Version 1.14l
 *	Mon Mar 19 17:39:46 EST 2001 - AM
 *
 *	Assorted changes to remove compilation error in 1.14k when compiled
 *	with kernel < 2.4.0
 *
 *	Version 1.14m
 *	Tue Mar 27 12:09:22 EST 2001 - AM
 *
 *	Added support for extended CDBs ( > 10 bytes ) and OBDR ( One Button
 *	Disaster Recovery ) feature.
 *
 *
 *	Version 1.14n
 *	Tue Apr 10 14:28:13 EDT 2001 - AM
 *
 *	"modeversions.h" is no longer included in the code.
 *	2.4.xx style mutex initialization used for older kernels also
 *
 *	Version 1.14o
 *	Wed Apr 18 17:47:26 EDT 2001 - PJ
 *
 *	Before returning status for 'inquiry', we first check if request buffer
 *	is SG list, and then return appropriate status
 *
 *	Version 1.14p
 *	Wed Apr 25 13:44:48 EDT 2001 - PJ
 *
 *	SCSI result made appropriate in case of check conditions for extended
 *	passthru commands
 *
 *	Do not support lun >7 for physically accessed devices 
 *
 *	
 *	Version 1.15
 *	Thu Apr 19 09:38:38 EDT 2001 - AM
 *
 *	1.14l rollover to 1.15 - merged with main trunk after 1.15d
 *
 *	Version 1.15b
 *  Wed May 16 20:10:01 EDT 2001 - AM
 *
 *	"modeversions.h" is no longer included in the code.
 *	2.4.xx style mutex initialization used for older kernels also
 *	Brought in-sync with Alan's changes in 2.4.4
 *	Note: 1.15a is on OBDR branch(main trunk), and is not merged with yet.
 *
 * Version 1.15c
 * Mon May 21 23:10:42 EDT 2001 - AM
 *
 * ioctl interface uses 2.4.x conforming pci dma calls
 * similar calls used for older kernels
 *
 * Version 1.15d
 * Wed May 30 17:30:41 EDT 2001 - AM
 *
 * NULL is not a valid first argument for pci_alloc_consistent() on
 * IA64(2.4.3-2.10.1). Code shuffling done in ioctl interface to get
 * "pci_dev" before making calls to pci interface routines.
 *
 * Version 1.16pre
 * Fri Jun  1 19:40:48 EDT 2001 - AM
 *
 * 1.14p and 1.15d merged
 * ROMB support added
 *
 * Version 1.16-pre1
 * Mon Jun  4 15:01:01 EDT 2001 - AM
 *
 * Non-ROMB firmware do no DMA support 0xA9 command. Value 0xFF
 * (all channels are raid ) is chosen for those firmware.
 *
 * Version 1.16-pre2
 * Mon Jun 11 18:15:31 EDT 2001 - AM
 *
 * Changes for boot from any logical drive
 *
 * Version 1.16
 * Tue Jun 26 18:07:02 EDT 2001 - AM
 *
 * branched at 1.14p
 *
 * Check added for HP 1M/2M controllers if having firmware H.01.07 or
 * H.01.08. If found, disable 64 bit support since these firmware have
 * limitations for 64 bit addressing
 *
 *
 * Version 1.17
 * Thu Jul 12 11:14:09 EDT 2001 - AM
 *
 * 1.16pre2 and 1.16 merged.
 *
 * init_MUTEX and init_MUTEX_LOCKED are defined in 2.2.19. Pre-processor
 * statements are added for them
 *
 * Linus's 2.4.7pre3 kernel introduces a new field 'max_sectors' in Scsi_Host
 * structure, to improve IO performance.
 *
 *
 * Version 1.17a
 * Fri Jul 13 18:44:01 EDT 2001 - AM
 *
 * Starting from kernel 2.4.x, LUN is not < 8 - following SCSI-III. So to have
 * our current formula working to calculate logical drive number, return
 * failure for LUN > 7
 *
 *
 * Version 1.17b
 * Mon Jul 30 19:24:02 EDT 2001 - AM
 *
 * Added support for random deletion of logical drives
 *
 * Version 1.17c
 * Tue Sep 25 09:37:49 EDT 2001 - Atul Mukker <[e-mail]>
 *
 * With single and dual channel controllers, some virtaul channels are
 * displayed negative.
 *
 * Version 1.17a-ac
 * Mon Aug 6 14:59:29 BST 2001 - "Michael Johnson" <[e-mail]>
 *
 * Make the HP print formatting and check for buggy firmware runtime not
 * ifdef dependant.
 *
 *
 * Version 1.17d
 * Thu Oct 11 10:48:45 EDT 2001 - Atul Mukker <[e-mail]>
 *
 * Driver 1.17c oops when loaded without controller.
 *
 * Special case for "use_sg == 1" removed while building the scatter gather
 * list.
 *
 * Version 1.18
 * Thu Oct 11 15:02:53 EDT 2001 - Atul Mukker <[e-mail]>
 *
 * References to AMI have been changed to LSI Logic.
 *
 *
 * BUGS:
 *     Some older 2.1 kernels (eg. 2.1.90) have a bug in pci.c that
 *     fails to detect the controller as a pci device on the system.
 *
 *     Timeout period for upper scsi layer, i.e. SD_TIMEOUT in
 *     /drivers/scsi/sd.c, is too short for this controller. SD_TIMEOUT
 *     value must be increased to (30 * HZ) otherwise false timeouts
 *     will occur in the upper layer.
 *
 *     Never set skip_id. The existing PCI code the megaraid uses fails
 *     to properly check the vendor subid in some cases. Setting this then
 *     makes it steal other i960's and crashes some boxes
 *
 *     Far too many ifdefs for versions.
 *
 *===================================================================*/

#include <linux/config.h>
#include <linux/version.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/fcntl.h>