sched: make the scheduler converge to the ideal latency

[deliverable/linux.git] / include / linux / i2o.h

/*
 * I2O kernel space accessible structures/APIs
 *
 * (c) Copyright 1999, 2000 Red Hat Software
 *
 * 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.
 *
 *************************************************************************
 *
 * This header file defined the I2O APIs/structures for use by
 * the I2O kernel modules.
 *
 */

#ifndef _I2O_H
#define _I2O_H

#ifdef __KERNEL__		/* This file to be included by kernel only */

#include <linux/i2o-dev.h>

/* How many different OSM's are we allowing */
#define I2O_MAX_DRIVERS		8

#include <linux/pci.h>
#include <linux/dma-mapping.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/workqueue.h>	/* work_struct */
#include <linux/mempool.h>
#include <linux/mutex.h>

#include <asm/io.h>
#include <asm/semaphore.h>	/* Needed for MUTEX init macros */

/* message queue empty */
#define I2O_QUEUE_EMPTY		0xffffffff

/*
 *	Cache strategies
 */

/*	The NULL strategy leaves everything up to the controller. This tends to be a
 *	pessimal but functional choice.
 */
#define CACHE_NULL		0
/*	Prefetch data when reading. We continually attempt to load the next 32 sectors
 *	into the controller cache.
 */
#define CACHE_PREFETCH		1
/*	Prefetch data when reading. We sometimes attempt to load the next 32 sectors
 *	into the controller cache. When an I/O is less <= 8K we assume its probably
 *	not sequential and don't prefetch (default)
 */
#define CACHE_SMARTFETCH	2
/*	Data is written to the cache and then out on to the disk. The I/O must be
 *	physically on the medium before the write is acknowledged (default without
 *	NVRAM)
 */
#define CACHE_WRITETHROUGH	17
/*	Data is written to the cache and then out on to the disk. The controller
 *	is permitted to write back the cache any way it wants. (default if battery
 *	backed NVRAM is present). It can be useful to set this for swap regardless of
 *	battery state.
 */
#define CACHE_WRITEBACK		18
/*	Optimise for under powered controllers, especially on RAID1 and RAID0. We
 *	write large I/O's directly to disk bypassing the cache to avoid the extra
 *	memory copy hits. Small writes are writeback cached
 */
#define CACHE_SMARTBACK		19
/*	Optimise for under powered controllers, especially on RAID1 and RAID0. We
 *	write large I/O's directly to disk bypassing the cache to avoid the extra
 *	memory copy hits. Small writes are writethrough cached. Suitable for devices
 *	lacking battery backup
 */
#define CACHE_SMARTTHROUGH	20

/*
 *	Ioctl structures
 */

#define 	BLKI2OGRSTRAT	_IOR('2', 1, int)
#define 	BLKI2OGWSTRAT	_IOR('2', 2, int)
#define 	BLKI2OSRSTRAT	_IOW('2', 3, int)
#define 	BLKI2OSWSTRAT	_IOW('2', 4, int)

/*
 *	I2O Function codes
 */

/*
 *	Executive Class
 */
#define	I2O_CMD_ADAPTER_ASSIGN		0xB3
#define	I2O_CMD_ADAPTER_READ		0xB2
#define	I2O_CMD_ADAPTER_RELEASE		0xB5
#define	I2O_CMD_BIOS_INFO_SET		0xA5
#define	I2O_CMD_BOOT_DEVICE_SET		0xA7
#define	I2O_CMD_CONFIG_VALIDATE		0xBB
#define	I2O_CMD_CONN_SETUP		0xCA
#define	I2O_CMD_DDM_DESTROY		0xB1
#define	I2O_CMD_DDM_ENABLE		0xD5
#define	I2O_CMD_DDM_QUIESCE		0xC7
#define	I2O_CMD_DDM_RESET		0xD9
#define	I2O_CMD_DDM_SUSPEND		0xAF
#define	I2O_CMD_DEVICE_ASSIGN		0xB7
#define	I2O_CMD_DEVICE_RELEASE		0xB9
#define	I2O_CMD_HRT_GET			0xA8
#define	I2O_CMD_ADAPTER_CLEAR		0xBE
#define	I2O_CMD_ADAPTER_CONNECT		0xC9
#define	I2O_CMD_ADAPTER_RESET		0xBD
#define	I2O_CMD_LCT_NOTIFY		0xA2
#define	I2O_CMD_OUTBOUND_INIT		0xA1
#define	I2O_CMD_PATH_ENABLE		0xD3
#define	I2O_CMD_PATH_QUIESCE		0xC5
#define	I2O_CMD_PATH_RESET		0xD7
#define	I2O_CMD_STATIC_MF_CREATE	0xDD
#define	I2O_CMD_STATIC_MF_RELEASE	0xDF
#define	I2O_CMD_STATUS_GET		0xA0
#define	I2O_CMD_SW_DOWNLOAD		0xA9
#define	I2O_CMD_SW_UPLOAD		0xAB
#define	I2O_CMD_SW_REMOVE		0xAD
#define	I2O_CMD_SYS_ENABLE		0xD1
#define	I2O_CMD_SYS_MODIFY		0xC1
#define	I2O_CMD_SYS_QUIESCE		0xC3
#define	I2O_CMD_SYS_TAB_SET		0xA3

/*
 * Utility Class
 */
#define I2O_CMD_UTIL_NOP		0x00
#define I2O_CMD_UTIL_ABORT		0x01
#define I2O_CMD_UTIL_CLAIM		0x09
#define I2O_CMD_UTIL_RELEASE		0x0B
#define I2O_CMD_UTIL_PARAMS_GET		0x06
#define I2O_CMD_UTIL_PARAMS_SET		0x05
#define I2O_CMD_UTIL_EVT_REGISTER	0x13
#define I2O_CMD_UTIL_EVT_ACK		0x14
#define I2O_CMD_UTIL_CONFIG_DIALOG	0x10
#define I2O_CMD_UTIL_DEVICE_RESERVE	0x0D
#define I2O_CMD_UTIL_DEVICE_RELEASE	0x0F
#define I2O_CMD_UTIL_LOCK		0x17
#define I2O_CMD_UTIL_LOCK_RELEASE	0x19
#define I2O_CMD_UTIL_REPLY_FAULT_NOTIFY	0x15

/*
 * SCSI Host Bus Adapter Class
 */
#define I2O_CMD_SCSI_EXEC		0x81
#define I2O_CMD_SCSI_ABORT		0x83
#define I2O_CMD_SCSI_BUSRESET		0x27

/*
 * Bus Adapter Class
 */
#define I2O_CMD_BUS_ADAPTER_RESET	0x85
#define I2O_CMD_BUS_RESET		0x87
#define I2O_CMD_BUS_SCAN		0x89
#define I2O_CMD_BUS_QUIESCE		0x8b

/*
 * Random Block Storage Class
 */
#define I2O_CMD_BLOCK_READ		0x30
#define I2O_CMD_BLOCK_WRITE		0x31
#define I2O_CMD_BLOCK_CFLUSH		0x37
#define I2O_CMD_BLOCK_MLOCK		0x49
#define I2O_CMD_BLOCK_MUNLOCK		0x4B
#define I2O_CMD_BLOCK_MMOUNT		0x41
#define I2O_CMD_BLOCK_MEJECT		0x43
#define I2O_CMD_BLOCK_POWER		0x70

#define I2O_CMD_PRIVATE			0xFF

/* Command status values  */

#define I2O_CMD_IN_PROGRESS	0x01
#define I2O_CMD_REJECTED	0x02
#define I2O_CMD_FAILED		0x03
#define I2O_CMD_COMPLETED	0x04

/* I2O API function return values */

#define I2O_RTN_NO_ERROR			0
#define I2O_RTN_NOT_INIT			1
#define I2O_RTN_FREE_Q_EMPTY			2
#define I2O_RTN_TCB_ERROR			3
#define I2O_RTN_TRANSACTION_ERROR		4
#define I2O_RTN_ADAPTER_ALREADY_INIT		5
#define I2O_RTN_MALLOC_ERROR			6
#define I2O_RTN_ADPTR_NOT_REGISTERED		7
#define I2O_RTN_MSG_REPLY_TIMEOUT		8
#define I2O_RTN_NO_STATUS			9
#define I2O_RTN_NO_FIRM_VER			10
#define	I2O_RTN_NO_LINK_SPEED			11

/* Reply message status defines for all messages */

#define I2O_REPLY_STATUS_SUCCESS                    	0x00
#define I2O_REPLY_STATUS_ABORT_DIRTY                	0x01
#define I2O_REPLY_STATUS_ABORT_NO_DATA_TRANSFER     	0x02
#define	I2O_REPLY_STATUS_ABORT_PARTIAL_TRANSFER		0x03
#define	I2O_REPLY_STATUS_ERROR_DIRTY			0x04
#define	I2O_REPLY_STATUS_ERROR_NO_DATA_TRANSFER		0x05
#define	I2O_REPLY_STATUS_ERROR_PARTIAL_TRANSFER		0x06
#define	I2O_REPLY_STATUS_PROCESS_ABORT_DIRTY		0x08
#define	I2O_REPLY_STATUS_PROCESS_ABORT_NO_DATA_TRANSFER	0x09
#define	I2O_REPLY_STATUS_PROCESS_ABORT_PARTIAL_TRANSFER	0x0A
#define	I2O_REPLY_STATUS_TRANSACTION_ERROR		0x0B
#define	I2O_REPLY_STATUS_PROGRESS_REPORT		0x80

/* Status codes and Error Information for Parameter functions */

#define I2O_PARAMS_STATUS_SUCCESS		0x00
#define I2O_PARAMS_STATUS_BAD_KEY_ABORT		0x01
#define I2O_PARAMS_STATUS_BAD_KEY_CONTINUE   	0x02
#define I2O_PARAMS_STATUS_BUFFER_FULL		0x03
#define I2O_PARAMS_STATUS_BUFFER_TOO_SMALL	0x04
#define I2O_PARAMS_STATUS_FIELD_UNREADABLE	0x05
#define I2O_PARAMS_STATUS_FIELD_UNWRITEABLE	0x06
#define I2O_PARAMS_STATUS_INSUFFICIENT_FIELDS	0x07
#define I2O_PARAMS_STATUS_INVALID_GROUP_ID	0x08
#define I2O_PARAMS_STATUS_INVALID_OPERATION	0x09
#define I2O_PARAMS_STATUS_NO_KEY_FIELD		0x0A
#define I2O_PARAMS_STATUS_NO_SUCH_FIELD		0x0B
#define I2O_PARAMS_STATUS_NON_DYNAMIC_GROUP	0x0C
#define I2O_PARAMS_STATUS_OPERATION_ERROR	0x0D
#define I2O_PARAMS_STATUS_SCALAR_ERROR		0x0E
#define I2O_PARAMS_STATUS_TABLE_ERROR		0x0F
#define I2O_PARAMS_STATUS_WRONG_GROUP_TYPE	0x10

/* DetailedStatusCode defines for Executive, DDM, Util and Transaction error
 * messages: Table 3-2 Detailed Status Codes.*/

#define I2O_DSC_SUCCESS                        0x0000
#define I2O_DSC_BAD_KEY                        0x0002
#define I2O_DSC_TCL_ERROR                      0x0003
#define I2O_DSC_REPLY_BUFFER_FULL              0x0004
#define I2O_DSC_NO_SUCH_PAGE                   0x0005
#define I2O_DSC_INSUFFICIENT_RESOURCE_SOFT     0x0006
#define I2O_DSC_INSUFFICIENT_RESOURCE_HARD     0x0007
#define I2O_DSC_CHAIN_BUFFER_TOO_LARGE         0x0009
#define I2O_DSC_UNSUPPORTED_FUNCTION           0x000A
#define I2O_DSC_DEVICE_LOCKED                  0x000B
#define I2O_DSC_DEVICE_RESET                   0x000C
#define I2O_DSC_INAPPROPRIATE_FUNCTION         0x000D
#define I2O_DSC_INVALID_INITIATOR_ADDRESS      0x000E
#define I2O_DSC_INVALID_MESSAGE_FLAGS          0x000F
#define I2O_DSC_INVALID_OFFSET                 0x0010
#define I2O_DSC_INVALID_PARAMETER              0x0011
#define I2O_DSC_INVALID_REQUEST                0x0012
#define I2O_DSC_INVALID_TARGET_ADDRESS         0x0013
#define I2O_DSC_MESSAGE_TOO_LARGE              0x0014
#define I2O_DSC_MESSAGE_TOO_SMALL              0x0015
#define I2O_DSC_MISSING_PARAMETER              0x0016
#define I2O_DSC_TIMEOUT                        0x0017
#define I2O_DSC_UNKNOWN_ERROR                  0x0018
#define I2O_DSC_UNKNOWN_FUNCTION               0x0019
#define I2O_DSC_UNSUPPORTED_VERSION            0x001A
#define I2O_DSC_DEVICE_BUSY                    0x001B
#define I2O_DSC_DEVICE_NOT_AVAILABLE           0x001C

/* DetailedStatusCode defines for Block Storage Operation: Table 6-7 Detailed
   Status Codes.*/

#define I2O_BSA_DSC_SUCCESS               0x0000
#define I2O_BSA_DSC_MEDIA_ERROR           0x0001
#define I2O_BSA_DSC_ACCESS_ERROR          0x0002
#define I2O_BSA_DSC_DEVICE_FAILURE        0x0003
#define I2O_BSA_DSC_DEVICE_NOT_READY      0x0004
#define I2O_BSA_DSC_MEDIA_NOT_PRESENT     0x0005
#define I2O_BSA_DSC_MEDIA_LOCKED          0x0006
#define I2O_BSA_DSC_MEDIA_FAILURE         0x0007
#define I2O_BSA_DSC_PROTOCOL_FAILURE      0x0008
#define I2O_BSA_DSC_BUS_FAILURE           0x0009
#define I2O_BSA_DSC_ACCESS_VIOLATION      0x000A
#define I2O_BSA_DSC_WRITE_PROTECTED       0x000B
#define I2O_BSA_DSC_DEVICE_RESET          0x000C
#define I2O_BSA_DSC_VOLUME_CHANGED        0x000D
#define I2O_BSA_DSC_TIMEOUT               0x000E

/* FailureStatusCodes, Table 3-3 Message Failure Codes */

#define I2O_FSC_TRANSPORT_SERVICE_SUSPENDED             0x81
#define I2O_FSC_TRANSPORT_SERVICE_TERMINATED            0x82
#define I2O_FSC_TRANSPORT_CONGESTION                    0x83
#define I2O_FSC_TRANSPORT_FAILURE                       0x84
#define I2O_FSC_TRANSPORT_STATE_ERROR                   0x85
#define I2O_FSC_TRANSPORT_TIME_OUT                      0x86
#define I2O_FSC_TRANSPORT_ROUTING_FAILURE               0x87
#define I2O_FSC_TRANSPORT_INVALID_VERSION               0x88
#define I2O_FSC_TRANSPORT_INVALID_OFFSET                0x89
#define I2O_FSC_TRANSPORT_INVALID_MSG_FLAGS             0x8A
#define I2O_FSC_TRANSPORT_FRAME_TOO_SMALL               0x8B
#define I2O_FSC_TRANSPORT_FRAME_TOO_LARGE               0x8C
#define I2O_FSC_TRANSPORT_INVALID_TARGET_ID             0x8D
#define I2O_FSC_TRANSPORT_INVALID_INITIATOR_ID          0x8E
#define I2O_FSC_TRANSPORT_INVALID_INITIATOR_CONTEXT     0x8F
#define I2O_FSC_TRANSPORT_UNKNOWN_FAILURE               0xFF

/* Device Claim Types */
#define	I2O_CLAIM_PRIMARY					0x01000000
#define	I2O_CLAIM_MANAGEMENT					0x02000000
#define	I2O_CLAIM_AUTHORIZED					0x03000000
#define	I2O_CLAIM_SECONDARY					0x04000000

/* Message header defines for VersionOffset */
#define I2OVER15	0x0001
#define I2OVER20	0x0002

/* Default is 1.5 */
#define I2OVERSION	I2OVER15

#define SGL_OFFSET_0    I2OVERSION
#define SGL_OFFSET_4    (0x0040 | I2OVERSION)
#define SGL_OFFSET_5    (0x0050 | I2OVERSION)
#define SGL_OFFSET_6    (0x0060 | I2OVERSION)
#define SGL_OFFSET_7    (0x0070 | I2OVERSION)
#define SGL_OFFSET_8    (0x0080 | I2OVERSION)
#define SGL_OFFSET_9    (0x0090 | I2OVERSION)
#define SGL_OFFSET_10   (0x00A0 | I2OVERSION)
#define SGL_OFFSET_11   (0x00B0 | I2OVERSION)
#define SGL_OFFSET_12   (0x00C0 | I2OVERSION)
#define SGL_OFFSET(x)   (((x)<<4) | I2OVERSION)

/* Transaction Reply Lists (TRL) Control Word structure */
#define TRL_SINGLE_FIXED_LENGTH		0x00
#define TRL_SINGLE_VARIABLE_LENGTH	0x40
#define TRL_MULTIPLE_FIXED_LENGTH	0x80

 /* msg header defines for MsgFlags */
#define MSG_STATIC	0x0100
#define MSG_64BIT_CNTXT	0x0200
#define MSG_MULTI_TRANS	0x1000
#define MSG_FAIL	0x2000
#define MSG_FINAL	0x4000
#define MSG_REPLY	0x8000

 /* minimum size msg */
#define THREE_WORD_MSG_SIZE	0x00030000
#define FOUR_WORD_MSG_SIZE	0x00040000
#define FIVE_WORD_MSG_SIZE	0x00050000
#define SIX_WORD_MSG_SIZE	0x00060000
#define SEVEN_WORD_MSG_SIZE	0x00070000
#define EIGHT_WORD_MSG_SIZE	0x00080000
#define NINE_WORD_MSG_SIZE	0x00090000
#define TEN_WORD_MSG_SIZE	0x000A0000
#define ELEVEN_WORD_MSG_SIZE	0x000B0000
#define I2O_MESSAGE_SIZE(x)	((x)<<16)

/* special TID assignments */
#define ADAPTER_TID		0
#define HOST_TID		1

/* outbound queue defines */
#define I2O_MAX_OUTBOUND_MSG_FRAMES	128
#define I2O_OUTBOUND_MSG_FRAME_SIZE	128	/* in 32-bit words */

/* inbound queue definitions */
#define I2O_MSG_INPOOL_MIN		32
#define I2O_INBOUND_MSG_FRAME_SIZE	128	/* in 32-bit words */

#define I2O_POST_WAIT_OK	0
#define I2O_POST_WAIT_TIMEOUT	-ETIMEDOUT

#define I2O_CONTEXT_LIST_MIN_LENGTH	15
#define I2O_CONTEXT_LIST_USED		0x01
#define I2O_CONTEXT_LIST_DELETED	0x02

/* timeouts */
#define I2O_TIMEOUT_INIT_OUTBOUND_QUEUE	15
#define I2O_TIMEOUT_MESSAGE_GET		5
#define I2O_TIMEOUT_RESET		30
#define I2O_TIMEOUT_STATUS_GET		5
#define I2O_TIMEOUT_LCT_GET		360
#define I2O_TIMEOUT_SCSI_SCB_ABORT	240

/* retries */
#define I2O_HRT_GET_TRIES		3
#define I2O_LCT_GET_TRIES		3

/* defines for max_sectors and max_phys_segments */
#define I2O_MAX_SECTORS			1024
#define I2O_MAX_SECTORS_LIMITED		128
#define I2O_MAX_PHYS_SEGMENTS		MAX_PHYS_SEGMENTS

/*
 *	Message structures
 */
struct i2o_message {
	union {
		struct {
			u8 version_offset;
			u8 flags;
			u16 size;
			u32 target_tid:12;
			u32 init_tid:12;
			u32 function:8;
			u32 icntxt;	/* initiator context */
			u32 tcntxt;	/* transaction context */
		} s;
		u32 head[4];
	} u;
	/* List follows */
	u32 body[0];
};

/* MFA and I2O message used by mempool */
struct i2o_msg_mfa {
	u32 mfa;		/* MFA returned by the controller */
	struct i2o_message msg;	/* I2O message */
};

/*
 *	Each I2O device entity has one of these. There is one per device.
 */
struct i2o_device {
	i2o_lct_entry lct_data;	/* Device LCT information */

	struct i2o_controller *iop;	/* Controlling IOP */
	struct list_head list;	/* node in IOP devices list */

	struct device device;

	struct mutex lock;	/* device lock */
};

/*
 *	Event structure provided to the event handling function
 */
struct i2o_event {
	struct work_struct work;
	struct i2o_device *i2o_dev;	/* I2O device pointer from which the
					   event reply was initiated */
	u16 size;		/* Size of data in 32-bit words */
	u32 tcntxt;		/* Transaction context used at
				   registration */
	u32 event_indicator;	/* Event indicator from reply */
	u32 data[0];		/* Event data from reply */
};

/*
 *	I2O classes which could be handled by the OSM
 */
struct i2o_class_id {
	u16 class_id:12;
};

/*
 *	I2O driver structure for OSMs
 */
struct i2o_driver {
	char *name;		/* OSM name */
	int context;		/* Low 8 bits of the transaction info */
	struct i2o_class_id *classes;	/* I2O classes that this OSM handles */

	/* Message reply handler */
	int (*reply) (struct i2o_controller *, u32, struct i2o_message *);

	/* Event handler */
	work_func_t event;

	struct workqueue_struct *event_queue;	/* Event queue */

	struct device_driver driver;

	/* notification of changes */
	void (*notify_controller_add) (struct i2o_controller *);
	void (*notify_controller_remove) (struct i2o_controller *);
	void (*notify_device_add) (struct i2o_device *);
	void (*notify_device_remove) (struct i2o_device *);

	struct semaphore lock;
};

/*
 *	Contains DMA mapped address information
 */
struct i2o_dma {
	void *virt;
	dma_addr_t phys;
	size_t len;
};

/*
 *	Contains slab cache and mempool information
 */
struct i2o_pool {
	char *name;
	struct kmem_cache *slab;
	mempool_t *mempool;
};

/*
 *	Contains IO mapped address information
 */
struct i2o_io {
	void __iomem *virt;
	unsigned long phys;
	unsigned long len;
};

/*
 *	Context queue entry, used for 32-bit context on 64-bit systems
 */
struct i2o_context_list_element {
	struct list_head list;
	u32 context;
	void *ptr;
	unsigned long timestamp;
};

/*
 * Each I2O controller has one of these objects
 */
struct i2o_controller {
	char name[16];
	int unit;
	int type;

	struct pci_dev *pdev;	/* PCI device */

	unsigned int promise:1;	/* Promise controller */
	unsigned int adaptec:1;	/* DPT / Adaptec controller */
	unsigned int raptor:1;	/* split bar */
	unsigned int no_quiesce:1;	/* dont quiesce before reset */
	unsigned int short_req:1;	/* use small block sizes */
	unsigned int limit_sectors:1;	/* limit number of sectors / request */
	unsigned int pae_support:1;	/* controller has 64-bit SGL support */

	struct list_head devices;	/* list of I2O devices */
	struct list_head list;	/* Controller list */

	void __iomem *in_port;	/* Inbout port address */
	void __iomem *out_port;	/* Outbound port address */
	void __iomem *irq_status;	/* Interrupt status register address */
	void __iomem *irq_mask;	/* Interrupt mask register address */

	struct i2o_dma status;	/* IOP status block */

	struct i2o_dma hrt;	/* HW Resource Table */
	i2o_lct *lct;		/* Logical Config Table */
	struct i2o_dma dlct;	/* Temp LCT */
	struct mutex lct_lock;	/* Lock for LCT updates */
	struct i2o_dma status_block;	/* IOP status block */

	struct i2o_io base;	/* controller messaging unit */
	struct i2o_io in_queue;	/* inbound message queue Host->IOP */
	struct i2o_dma out_queue;	/* outbound message queue IOP->Host */

	struct i2o_pool in_msg;	/* mempool for inbound messages */

	unsigned int battery:1;	/* Has a battery backup */
	unsigned int io_alloc:1;	/* An I/O resource was allocated */
	unsigned int mem_alloc:1;	/* A memory resource was allocated */

	struct resource io_resource;	/* I/O resource allocated to the IOP */
	struct resource mem_resource;	/* Mem resource allocated to the IOP */

	struct device device;
	struct i2o_device *exec;	/* Executive */
#if BITS_PER_LONG == 64
	spinlock_t context_list_lock;	/* lock for context_list */
	atomic_t context_list_counter;	/* needed for unique contexts */
	struct list_head context_list;	/* list of context id's
					   and pointers */
#endif
	spinlock_t lock;	/* lock for controller
				   configuration */

	void *driver_data[I2O_MAX_DRIVERS];	/* storage for drivers */
};

/*
 * I2O System table entry
 *
 * The system table contains information about all the IOPs in the
 * system.  It is sent to all IOPs so that they can create peer2peer
 * connections between them.
 */
struct i2o_sys_tbl_entry {
	u16 org_id;
	u16 reserved1;
	u32 iop_id:12;
	u32 reserved2:20;
	u16 seg_num:12;
	u16 i2o_version:4;
	u8 iop_state;
	u8 msg_type;
	u16 frame_size;
	u16 reserved3;
	u32 last_changed;
	u32 iop_capabilities;
	u32 inbound_low;
	u32 inbound_high;
};

struct i2o_sys_tbl {
	u8 num_entries;
	u8 version;
	u16 reserved1;
	u32 change_ind;
	u32 reserved2;
	u32 reserved3;
	struct i2o_sys_tbl_entry iops[0];
};

extern struct list_head i2o_controllers;

/* Message functions */
static inline struct i2o_message *i2o_msg_get(struct i2o_controller *);
extern struct i2o_message *i2o_msg_get_wait(struct i2o_controller *, int);
static inline void i2o_msg_post(struct i2o_controller *, struct i2o_message *);
static inline int i2o_msg_post_wait(struct i2o_controller *,
				    struct i2o_message *, unsigned long);
extern int i2o_msg_post_wait_mem(struct i2o_controller *, struct i2o_message *,
				 unsigned long, struct i2o_dma *);
static inline void i2o_flush_reply(struct i2o_controller *, u32);

/* IOP functions */
extern int i2o_status_get(struct i2o_controller *);

extern int i2o_event_register(struct i2o_device *, struct i2o_driver *, int,
			      u32);
extern struct i2o_device *i2o_iop_find_device(struct i2o_controller *, u16);
extern struct i2o_controller *i2o_find_iop(int);

/* Functions needed for handling 64-bit pointers in 32-bit context */
#if BITS_PER_LONG == 64
extern u32 i2o_cntxt_list_add(struct i2o_controller *, void *);
extern void *i2o_cntxt_list_get(struct i2o_controller *, u32);
extern u32 i2o_cntxt_list_remove(struct i2o_controller *, void *);
extern u32 i2o_cntxt_list_get_ptr(struct i2o_controller *, void *);

static inline u32 i2o_ptr_low(void *ptr)
{
	return (u32) (u64) ptr;
};

static inline u32 i2o_ptr_high(void *ptr)
{
	return (u32) ((u64) ptr >> 32);
};

static inline u32 i2o_dma_low(dma_addr_t dma_addr)
{
	return (u32) (u64) dma_addr;
};

static inline u32 i2o_dma_high(dma_addr_t dma_addr)
{
	return (u32) ((u64) dma_addr >> 32);
};
#else
static inline u32 i2o_cntxt_list_add(struct i2o_controller *c, void *ptr)
{
	return (u32) ptr;
};

static inline void *i2o_cntxt_list_get(struct i2o_controller *c, u32 context)
{
	return (void *)context;
};

static inline u32 i2o_cntxt_list_remove(struct i2o_controller *c, void *ptr)
{
	return (u32) ptr;
};

static inline u32 i2o_cntxt_list_get_ptr(struct i2o_controller *c, void *ptr)
{
	return (u32) ptr;
};

static inline u32 i2o_ptr_low(void *ptr)
{
	return (u32) ptr;
};

static inline u32 i2o_ptr_high(void *ptr)
{
	return 0;
};

static inline u32 i2o_dma_low(dma_addr_t dma_addr)
{
	return (u32) dma_addr;
};

static inline u32 i2o_dma_high(dma_addr_t dma_addr)
{
	return 0;
};
#endif

/**
 *	i2o_sg_tablesize - Calculate the maximum number of elements in a SGL
 *	@c: I2O controller for which the calculation should be done
 *	@body_size: maximum body size used for message in 32-bit words.
 *
 *	Return the maximum number of SG elements in a SG list.
 */
static inline u16 i2o_sg_tablesize(struct i2o_controller *c, u16 body_size)
{
	i2o_status_block *sb = c->status_block.virt;
	u16 sg_count =
	    (sb->inbound_frame_size - sizeof(struct i2o_message) / 4) -
	    body_size;

	if (c->pae_support) {
		/*
		 * for 64-bit a SG attribute element must be added and each
		 * SG element needs 12 bytes instead of 8.
		 */
		sg_count -= 2;
		sg_count /= 3;
	} else
		sg_count /= 2;

	if (c->short_req && (sg_count > 8))
		sg_count = 8;

	return sg_count;
};

/**
 *	i2o_dma_map_single - Map pointer to controller and fill in I2O message.
 *	@c: I2O controller
 *	@ptr: pointer to the data which should be mapped
 *	@size: size of data in bytes
 *	@direction: DMA_TO_DEVICE / DMA_FROM_DEVICE
 *	@sg_ptr: pointer to the SG list inside the I2O message
 *
 *	This function does all necessary DMA handling and also writes the I2O
 *	SGL elements into the I2O message. For details on DMA handling see also
 *	dma_map_single(). The pointer sg_ptr will only be set to the end of the
 *	SG list if the allocation was successful.
 *
 *	Returns DMA address which must be checked for failures using
 *	dma_mapping_error().
 */
static inline dma_addr_t i2o_dma_map_single(struct i2o_controller *c, void *ptr,
					    size_t size,
					    enum dma_data_direction direction,
					    u32 ** sg_ptr)
{
	u32 sg_flags;
	u32 *mptr = *sg_ptr;
	dma_addr_t dma_addr;

	switch (direction) {
	case DMA_TO_DEVICE:
		sg_flags = 0xd4000000;
		break;
	case DMA_FROM_DEVICE:
		sg_flags = 0xd0000000;
		break;
	default:
		return 0;
	}

	dma_addr = dma_map_single(&c->pdev->dev, ptr, size, direction);
	if (!dma_mapping_error(dma_addr)) {
#ifdef CONFIG_I2O_EXT_ADAPTEC_DMA64
		if ((sizeof(dma_addr_t) > 4) && c->pae_support) {
			*mptr++ = cpu_to_le32(0x7C020002);
			*mptr++ = cpu_to_le32(PAGE_SIZE);
		}
#endif

		*mptr++ = cpu_to_le32(sg_flags | size);
		*mptr++ = cpu_to_le32(i2o_dma_low(dma_addr));
#ifdef CONFIG_I2O_EXT_ADAPTEC_DMA64
		if ((sizeof(dma_addr_t) > 4) && c->pae_support)
			*mptr++ = cpu_to_le32(i2o_dma_high(dma_addr));
#endif
		*sg_ptr = mptr;
	}
	return dma_addr;
};

/**
 *	i2o_dma_map_sg - Map a SG List to controller and fill in I2O message.
 *	@c: I2O controller
 *	@sg: SG list to be mapped
 *	@sg_count: number of elements in the SG list
 *	@direction: DMA_TO_DEVICE / DMA_FROM_DEVICE
 *	@sg_ptr: pointer to the SG list inside the I2O message
 *
 *	This function does all necessary DMA handling and also writes the I2O
 *	SGL elements into the I2O message. For details on DMA handling see also
 *	dma_map_sg(). The pointer sg_ptr will only be set to the end of the SG
 *	list if the allocation was successful.
 *
 *	Returns 0 on failure or 1 on success.
 */
static inline int i2o_dma_map_sg(struct i2o_controller *c,
				 struct scatterlist *sg, int sg_count,
				 enum dma_data_direction direction,
				 u32 ** sg_ptr)
{
	u32 sg_flags;
	u32 *mptr = *sg_ptr;

	switch (direction) {
	case DMA_TO_DEVICE:
		sg_flags = 0x14000000;
		break;
	case DMA_FROM_DEVICE:
		sg_flags = 0x10000000;
		break;
	default:
		return 0;
	}

	sg_count = dma_map_sg(&c->pdev->dev, sg, sg_count, direction);
	if (!sg_count)
		return 0;

#ifdef CONFIG_I2O_EXT_ADAPTEC_DMA64
	if ((sizeof(dma_addr_t) > 4) && c->pae_support) {
		*mptr++ = cpu_to_le32(0x7C020002);
		*mptr++ = cpu_to_le32(PAGE_SIZE);
	}
#endif

	while (sg_count-- > 0) {
		if (!sg_count)
			sg_flags |= 0xC0000000;
		*mptr++ = cpu_to_le32(sg_flags | sg_dma_len(sg));
		*mptr++ = cpu_to_le32(i2o_dma_low(sg_dma_address(sg)));
#ifdef CONFIG_I2O_EXT_ADAPTEC_DMA64
		if ((sizeof(dma_addr_t) > 4) && c->pae_support)
			*mptr++ = cpu_to_le32(i2o_dma_high(sg_dma_address(sg)));
#endif
		sg++;
	}
	*sg_ptr = mptr;

	return 1;
};

/**
 *	i2o_dma_alloc - Allocate DMA memory
 *	@dev: struct device pointer to the PCI device of the I2O controller
 *	@addr: i2o_dma struct which should get the DMA buffer
 *	@len: length of the new DMA memory
 *	@gfp_mask: GFP mask
 *
 *	Allocate a coherent DMA memory and write the pointers into addr.
 *
 *	Returns 0 on success or -ENOMEM on failure.
 */
static inline int i2o_dma_alloc(struct device *dev, struct i2o_dma *addr,
				size_t len, gfp_t gfp_mask)
{
	struct pci_dev *pdev = to_pci_dev(dev);
	int dma_64 = 0;

	if ((sizeof(dma_addr_t) > 4) && (pdev->dma_mask == DMA_64BIT_MASK)) {
		dma_64 = 1;
		if (pci_set_dma_mask(pdev, DMA_32BIT_MASK))
			return -ENOMEM;
	}

	addr->virt = dma_alloc_coherent(dev, len, &addr->phys, gfp_mask);

	if ((sizeof(dma_addr_t) > 4) && dma_64)
		if (pci_set_dma_mask(pdev, DMA_64BIT_MASK))
			printk(KERN_WARNING "i2o: unable to set 64-bit DMA");

	if (!addr->virt)
		return -ENOMEM;

	memset(addr->virt, 0, len);
	addr->len = len;

	return 0;
};

/**
 *	i2o_dma_free - Free DMA memory
 *	@dev: struct device pointer to the PCI device of the I2O controller
 *	@addr: i2o_dma struct which contains the DMA buffer
 *
 *	Free a coherent DMA memory and set virtual address of addr to NULL.
 */
static inline void i2o_dma_free(struct device *dev, struct i2o_dma *addr)
{
	if (addr->virt) {
		if (addr->phys)
			dma_free_coherent(dev, addr->len, addr->virt,
					  addr->phys);
		else
			kfree(addr->virt);
		addr->virt = NULL;
	}
};

/**
 *	i2o_dma_realloc - Realloc DMA memory
 *	@dev: struct device pointer to the PCI device of the I2O controller
 *	@addr: pointer to a i2o_dma struct DMA buffer
 *	@len: new length of memory
 *	@gfp_mask: GFP mask
 *
 *	If there was something allocated in the addr, free it first. If len > 0
 *	than try to allocate it and write the addresses back to the addr
 *	structure. If len == 0 set the virtual address to NULL.
 *
 *	Returns the 0 on success or negative error code on failure.
 */
static inline int i2o_dma_realloc(struct device *dev, struct i2o_dma *addr,
				  size_t len, gfp_t gfp_mask)
{
	i2o_dma_free(dev, addr);

	if (len)
		return i2o_dma_alloc(dev, addr, len, gfp_mask);

	return 0;
};

/*
 *	i2o_pool_alloc - Allocate an slab cache and mempool
 *	@mempool: pointer to struct i2o_pool to write data into.
 *	@name: name which is used to identify cache
 *	@size: size of each object
 *	@min_nr: minimum number of objects
 *
 *	First allocates a slab cache with name and size. Then allocates a
 *	mempool which uses the slab cache for allocation and freeing.
 *
 *	Returns 0 on success or negative error code on failure.
 */
static inline int i2o_pool_alloc(struct i2o_pool *pool, const char *name,
				 size_t size, int min_nr)
{
	pool->name = kmalloc(strlen(name) + 1, GFP_KERNEL);
	if (!pool->name)
		goto exit;
	strcpy(pool->name, name);

	pool->slab =
	    kmem_cache_create(pool->name, size, 0, SLAB_HWCACHE_ALIGN, NULL);
	if (!pool->slab)
		goto free_name;

	pool->mempool = mempool_create_slab_pool(min_nr, pool->slab);
	if (!pool->mempool)
		goto free_slab;

	return 0;

      free_slab:
	kmem_cache_destroy(pool->slab);

      free_name:
	kfree(pool->name);

      exit:
	return -ENOMEM;
};

/*
 *	i2o_pool_free - Free slab cache and mempool again
 *	@mempool: pointer to struct i2o_pool which should be freed
 *
 *	Note that you have to return all objects to the mempool again before
 *	calling i2o_pool_free().
 */
static inline void i2o_pool_free(struct i2o_pool *pool)
{
	mempool_destroy(pool->mempool);
	kmem_cache_destroy(pool->slab);
	kfree(pool->name);
};

/* I2O driver (OSM) functions */
extern int i2o_driver_register(struct i2o_driver *);
extern void i2o_driver_unregister(struct i2o_driver *);

/**
 *	i2o_driver_notify_controller_add - Send notification of added controller
 *	@drv: I2O driver
 *	@c: I2O controller
 *
 *	Send notification of added controller to a single registered driver.
 */
static inline void i2o_driver_notify_controller_add(struct i2o_driver *drv,
						    struct i2o_controller *c)
{
	if (drv->notify_controller_add)
		drv->notify_controller_add(c);
};

/**
 *	i2o_driver_notify_controller_remove - Send notification of removed controller
 *	@drv: I2O driver
 *	@c: I2O controller
 *
 *	Send notification of removed controller to a single registered driver.
 */
static inline void i2o_driver_notify_controller_remove(struct i2o_driver *drv,
						       struct i2o_controller *c)
{
	if (drv->notify_controller_remove)
		drv->notify_controller_remove(c);
};

/**
 *	i2o_driver_notify_device_add - Send notification of added device
 *	@drv: I2O driver
 *	@i2o_dev: the added i2o_device
 *
 *	Send notification of added device to a single registered driver.
 */
static inline void i2o_driver_notify_device_add(struct i2o_driver *drv,
						struct i2o_device *i2o_dev)
{
	if (drv->notify_device_add)
		drv->notify_device_add(i2o_dev);
};

/**
 *	i2o_driver_notify_device_remove - Send notification of removed device
 *	@drv: I2O driver
 *	@i2o_dev: the added i2o_device
 *
 *	Send notification of removed device to a single registered driver.
 */
static inline void i2o_driver_notify_device_remove(struct i2o_driver *drv,
						   struct i2o_device *i2o_dev)
{
	if (drv->notify_device_remove)
		drv->notify_device_remove(i2o_dev);
};

extern void i2o_driver_notify_controller_add_all(struct i2o_controller *);
extern void i2o_driver_notify_controller_remove_all(struct i2o_controller *);
extern void i2o_driver_notify_device_add_all(struct i2o_device *);
extern void i2o_driver_notify_device_remove_all(struct i2o_device *);

/* I2O device functions */
extern int i2o_device_claim(struct i2o_device *);
extern int i2o_device_claim_release(struct i2o_device *);

/* Exec OSM functions */
extern int i2o_exec_lct_get(struct i2o_controller *);

/* device / driver / kobject conversion functions */
#define to_i2o_driver(drv) container_of(drv,struct i2o_driver, driver)
#define to_i2o_device(dev) container_of(dev, struct i2o_device, device)
#define to_i2o_controller(dev) container_of(dev, struct i2o_controller, device)
#define kobj_to_i2o_device(kobj) to_i2o_device(container_of(kobj, struct device, kobj))

/**
 *	i2o_out_to_virt - Turn an I2O message to a virtual address
 *	@c: controller
 *	@m: message engine value
 *
 *	Turn a receive message from an I2O controller bus address into
 *	a Linux virtual address. The shared page frame is a linear block
 *	so we simply have to shift the offset. This function does not
 *	work for sender side messages as they are ioremap objects
 *	provided by the I2O controller.
 */
static inline struct i2o_message *i2o_msg_out_to_virt(struct i2o_controller *c,
						      u32 m)
{
	BUG_ON(m < c->out_queue.phys
	       || m >= c->out_queue.phys + c->out_queue.len);

	return c->out_queue.virt + (m - c->out_queue.phys);
};

/**
 *	i2o_msg_in_to_virt - Turn an I2O message to a virtual address
 *	@c: controller
 *	@m: message engine value
 *
 *	Turn a send message from an I2O controller bus address into
 *	a Linux virtual address. The shared page frame is a linear block
 *	so we simply have to shift the offset. This function does not
 *	work for receive side messages as they are kmalloc objects
 *	in a different pool.
 */
static inline struct i2o_message __iomem *i2o_msg_in_to_virt(struct
							     i2o_controller *c,
							     u32 m)
{
	return c->in_queue.virt + m;
};

/**
 *	i2o_msg_get - obtain an I2O message from the IOP
 *	@c: I2O controller
 *
 *	This function tries to get a message frame. If no message frame is
 *	available do not wait until one is availabe (see also i2o_msg_get_wait).
 *	The returned pointer to the message frame is not in I/O memory, it is
 *	allocated from a mempool. But because a MFA is allocated from the
 *	controller too it is guaranteed that i2o_msg_post() will never fail.
 *
 *	On a success a pointer to the message frame is returned. If the message
 *	queue is empty -EBUSY is returned and if no memory is available -ENOMEM
 *	is returned.
 */
static inline struct i2o_message *i2o_msg_get(struct i2o_controller *c)
{
	struct i2o_msg_mfa *mmsg = mempool_alloc(c->in_msg.mempool, GFP_ATOMIC);
	if (!mmsg)
		return ERR_PTR(-ENOMEM);

	mmsg->mfa = readl(c->in_port);
	if (unlikely(mmsg->mfa >= c->in_queue.len)) {
		u32 mfa = mmsg->mfa;

		mempool_free(mmsg, c->in_msg.mempool);

		if (mfa == I2O_QUEUE_EMPTY)
			return ERR_PTR(-EBUSY);
		return ERR_PTR(-EFAULT);
	}

	return &mmsg->msg;
};

/**
 *	i2o_msg_post - Post I2O message to I2O controller
 *	@c: I2O controller to which the message should be send
 *	@msg: message returned by i2o_msg_get()
 *
 *	Post the message to the I2O controller and return immediately.
 */
static inline void i2o_msg_post(struct i2o_controller *c,
				struct i2o_message *msg)
{
	struct i2o_msg_mfa *mmsg;

	mmsg = container_of(msg, struct i2o_msg_mfa, msg);
	memcpy_toio(i2o_msg_in_to_virt(c, mmsg->mfa), msg,
		    (le32_to_cpu(msg->u.head[0]) >> 16) << 2);
	writel(mmsg->mfa, c->in_port);
	mempool_free(mmsg, c->in_msg.mempool);
};

/**
 * 	i2o_msg_post_wait - Post and wait a message and wait until return
 *	@c: controller
 *	@msg: message to post
 *	@timeout: time in seconds to wait
 *
 * 	This API allows an OSM to post a message and then be told whether or
 *	not the system received a successful reply. If the message times out
 *	then the value '-ETIMEDOUT' is returned.
 *
 *	Returns 0 on success or negative error code on failure.
 */
static inline int i2o_msg_post_wait(struct i2o_controller *c,
				    struct i2o_message *msg,
				    unsigned long timeout)
{
	return i2o_msg_post_wait_mem(c, msg, timeout, NULL);
};

/**
 *	i2o_msg_nop_mfa - Returns a fetched MFA back to the controller
 *	@c: I2O controller from which the MFA was fetched
 *	@mfa: MFA which should be returned
 *
 *	This function must be used for preserved messages, because i2o_msg_nop()
 *	also returns the allocated memory back to the msg_pool mempool.
 */
static inline void i2o_msg_nop_mfa(struct i2o_controller *c, u32 mfa)
{
	struct i2o_message __iomem *msg;
	u32 nop[3] = {
		THREE_WORD_MSG_SIZE | SGL_OFFSET_0,
		I2O_CMD_UTIL_NOP << 24 | HOST_TID << 12 | ADAPTER_TID,
		0x00000000
	};

	msg = i2o_msg_in_to_virt(c, mfa);
	memcpy_toio(msg, nop, sizeof(nop));
	writel(mfa, c->in_port);
};

/**
 *	i2o_msg_nop - Returns a message which is not used
 *	@c: I2O controller from which the message was created
 *	@msg: message which should be returned
 *
 *	If you fetch a message via i2o_msg_get, and can't use it, you must
 *	return the message with this function. Otherwise the MFA is lost as well
 *	as the allocated memory from the mempool.
 */
static inline void i2o_msg_nop(struct i2o_controller *c,
			       struct i2o_message *msg)
{
	struct i2o_msg_mfa *mmsg;
	mmsg = container_of(msg, struct i2o_msg_mfa, msg);

	i2o_msg_nop_mfa(c, mmsg->mfa);
	mempool_free(mmsg, c->in_msg.mempool);
};

/**
 *	i2o_flush_reply - Flush reply from I2O controller
 *	@c: I2O controller
 *	@m: the message identifier
 *
 *	The I2O controller must be informed that the reply message is not needed
 *	anymore. If you forget to flush the reply, the message frame can't be
 *	used by the controller anymore and is therefore lost.
 */
static inline void i2o_flush_reply(struct i2o_controller *c, u32 m)
{
	writel(m, c->out_port);
};

/*
 *	Endian handling wrapped into the macro - keeps the core code
 *	cleaner.
 */

#define i2o_raw_writel(val, mem)	__raw_writel(cpu_to_le32(val), mem)

extern int i2o_parm_field_get(struct i2o_device *, int, int, void *, int);
extern int i2o_parm_table_get(struct i2o_device *, int, int, int, void *, int,
			      void *, int);

/* debugging and troubleshooting/diagnostic helpers. */
#define osm_printk(level, format, arg...)  \
	printk(level "%s: " format, OSM_NAME , ## arg)

#ifdef DEBUG
#define osm_debug(format, arg...) \
	osm_printk(KERN_DEBUG, format , ## arg)
#else
#define osm_debug(format, arg...) \
        do { } while (0)
#endif

#define osm_err(format, arg...)		\
	osm_printk(KERN_ERR, format , ## arg)
#define osm_info(format, arg...)		\
	osm_printk(KERN_INFO, format , ## arg)
#define osm_warn(format, arg...)		\
	osm_printk(KERN_WARNING, format , ## arg)

/* debugging functions */
extern void i2o_report_status(const char *, const char *, struct i2o_message *);
extern void i2o_dump_message(struct i2o_message *);
extern void i2o_dump_hrt(struct i2o_controller *c);
extern void i2o_debug_state(struct i2o_controller *c);

#endif				/* __KERNEL__ */
#endif				/* _I2O_H */