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linux-next/include/linux/i2o.h
Alan Cox 9d793b0bcb i2o: Fix 32/64bit DMA locking 
The I2O ioctls assume 32bits.  In itself that is fine as they are old
cards and nobody uses 64bit.  However on LKML it was noted this
assumption is also made for allocated memory and is unsafe on 64bit
systems.

Fixing this is a mess.  It turns out there is tons of crap buried in a
header file that does racy 32/64bit filtering on the masks.

So we:
- Verify all callers of the racy code can sleep (i2o_dma_[re]alloc)
- Move the code into a new i2o/memory.c file
- Remove the gfp_mask argument so nobody can try and misuse the function
- Wrap a mutex around the problem area (a single mutex is easy to do and
  none of this is performance relevant)
- Switch the remaining problem kmalloc holdout to use i2o_dma_alloc

Cc: Markus Lidel <Markus.Lidel@shadowconnect.com>
Cc: Vasily Averin <vvs@sw.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-10-16 11:21:38 -07:00

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/*
* 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
#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 <linux/scatterlist.h>
#include <linux/semaphore.h> /* Needed for MUTEX init macros */
#include <asm/io.h>
/* 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 */
extern struct i2o_message *i2o_msg_get_wait(struct i2o_controller *, int);
extern int i2o_msg_post_wait_mem(struct i2o_controller *, struct i2o_message *,
unsigned long, struct i2o_dma *);
/* 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
extern u16 i2o_sg_tablesize(struct i2o_controller *c, u16 body_size);
extern dma_addr_t i2o_dma_map_single(struct i2o_controller *c, void *ptr,
size_t size,
enum dma_data_direction direction,
u32 ** sg_ptr);
extern int i2o_dma_map_sg(struct i2o_controller *c,
struct scatterlist *sg, int sg_count,
enum dma_data_direction direction,
u32 ** sg_ptr);
extern int i2o_dma_alloc(struct device *dev, struct i2o_dma *addr, size_t len);
extern void i2o_dma_free(struct device *dev, struct i2o_dma *addr);
extern int i2o_dma_realloc(struct device *dev, struct i2o_dma *addr,
size_t len);
extern int i2o_pool_alloc(struct i2o_pool *pool, const char *name,
size_t size, int min_nr);
extern void i2o_pool_free(struct i2o_pool *pool);
/* 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 /* _I2O_H */
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