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345 lines
12 KiB
345 lines
12 KiB
/* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file "COPYING" in the main directory of this archive |
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* for more details. |
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* |
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* (C) Copyright 2020 Hewlett Packard Enterprise Development LP |
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* Copyright (C) 2004-2008 Silicon Graphics, Inc. All rights reserved. |
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*/ |
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/* |
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* External Cross Partition (XP) structures and defines. |
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*/ |
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#ifndef _DRIVERS_MISC_SGIXP_XP_H |
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#define _DRIVERS_MISC_SGIXP_XP_H |
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#include <linux/mutex.h> |
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#if defined CONFIG_X86_UV || defined CONFIG_IA64_SGI_UV |
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#include <asm/uv/uv.h> |
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#endif |
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#ifdef USE_DBUG_ON |
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#define DBUG_ON(condition) BUG_ON(condition) |
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#else |
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#define DBUG_ON(condition) |
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#endif |
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/* |
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* Define the maximum number of partitions the system can possibly support. |
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* It is based on the maximum number of hardware partitionable regions. The |
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* term 'region' in this context refers to the minimum number of nodes that |
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* can comprise an access protection grouping. The access protection is in |
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* regards to memory, IPI and IOI. |
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* |
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* The maximum number of hardware partitionable regions is equal to the |
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* maximum number of nodes in the entire system divided by the minimum number |
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* of nodes that comprise an access protection grouping. |
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*/ |
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#define XP_MAX_NPARTITIONS_SN2 64 |
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#define XP_MAX_NPARTITIONS_UV 256 |
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/* |
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* XPC establishes channel connections between the local partition and any |
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* other partition that is currently up. Over these channels, kernel-level |
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* `users' can communicate with their counterparts on the other partitions. |
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* |
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* If the need for additional channels arises, one can simply increase |
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* XPC_MAX_NCHANNELS accordingly. If the day should come where that number |
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* exceeds the absolute MAXIMUM number of channels possible (eight), then one |
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* will need to make changes to the XPC code to accommodate for this. |
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* |
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* The absolute maximum number of channels possible is limited to eight for |
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* performance reasons on sn2 hardware. The internal cross partition structures |
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* require sixteen bytes per channel, and eight allows all of this |
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* interface-shared info to fit in one 128-byte cacheline. |
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*/ |
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#define XPC_MEM_CHANNEL 0 /* memory channel number */ |
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#define XPC_NET_CHANNEL 1 /* network channel number */ |
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#define XPC_MAX_NCHANNELS 2 /* max #of channels allowed */ |
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#if XPC_MAX_NCHANNELS > 8 |
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#error XPC_MAX_NCHANNELS exceeds absolute MAXIMUM possible. |
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#endif |
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/* |
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* Define macro, XPC_MSG_SIZE(), is provided for the user |
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* that wants to fit as many msg entries as possible in a given memory size |
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* (e.g. a memory page). |
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*/ |
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#define XPC_MSG_MAX_SIZE 128 |
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#define XPC_MSG_HDR_MAX_SIZE 16 |
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#define XPC_MSG_PAYLOAD_MAX_SIZE (XPC_MSG_MAX_SIZE - XPC_MSG_HDR_MAX_SIZE) |
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#define XPC_MSG_SIZE(_payload_size) \ |
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ALIGN(XPC_MSG_HDR_MAX_SIZE + (_payload_size), \ |
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is_uv_system() ? 64 : 128) |
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/* |
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* Define the return values and values passed to user's callout functions. |
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* (It is important to add new value codes at the end just preceding |
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* xpUnknownReason, which must have the highest numerical value.) |
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*/ |
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enum xp_retval { |
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xpSuccess = 0, |
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xpNotConnected, /* 1: channel is not connected */ |
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xpConnected, /* 2: channel connected (opened) */ |
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xpRETIRED1, /* 3: (formerly xpDisconnected) */ |
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xpMsgReceived, /* 4: message received */ |
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xpMsgDelivered, /* 5: message delivered and acknowledged */ |
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xpRETIRED2, /* 6: (formerly xpTransferFailed) */ |
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xpNoWait, /* 7: operation would require wait */ |
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xpRetry, /* 8: retry operation */ |
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xpTimeout, /* 9: timeout in xpc_allocate_msg_wait() */ |
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xpInterrupted, /* 10: interrupted wait */ |
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xpUnequalMsgSizes, /* 11: message size disparity between sides */ |
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xpInvalidAddress, /* 12: invalid address */ |
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xpNoMemory, /* 13: no memory available for XPC structures */ |
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xpLackOfResources, /* 14: insufficient resources for operation */ |
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xpUnregistered, /* 15: channel is not registered */ |
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xpAlreadyRegistered, /* 16: channel is already registered */ |
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xpPartitionDown, /* 17: remote partition is down */ |
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xpNotLoaded, /* 18: XPC module is not loaded */ |
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xpUnloading, /* 19: this side is unloading XPC module */ |
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xpBadMagic, /* 20: XPC MAGIC string not found */ |
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xpReactivating, /* 21: remote partition was reactivated */ |
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xpUnregistering, /* 22: this side is unregistering channel */ |
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xpOtherUnregistering, /* 23: other side is unregistering channel */ |
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xpCloneKThread, /* 24: cloning kernel thread */ |
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xpCloneKThreadFailed, /* 25: cloning kernel thread failed */ |
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xpNoHeartbeat, /* 26: remote partition has no heartbeat */ |
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xpPioReadError, /* 27: PIO read error */ |
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xpPhysAddrRegFailed, /* 28: registration of phys addr range failed */ |
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xpRETIRED3, /* 29: (formerly xpBteDirectoryError) */ |
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xpRETIRED4, /* 30: (formerly xpBtePoisonError) */ |
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xpRETIRED5, /* 31: (formerly xpBteWriteError) */ |
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xpRETIRED6, /* 32: (formerly xpBteAccessError) */ |
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xpRETIRED7, /* 33: (formerly xpBtePWriteError) */ |
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xpRETIRED8, /* 34: (formerly xpBtePReadError) */ |
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xpRETIRED9, /* 35: (formerly xpBteTimeOutError) */ |
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xpRETIRED10, /* 36: (formerly xpBteXtalkError) */ |
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xpRETIRED11, /* 37: (formerly xpBteNotAvailable) */ |
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xpRETIRED12, /* 38: (formerly xpBteUnmappedError) */ |
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xpBadVersion, /* 39: bad version number */ |
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xpVarsNotSet, /* 40: the XPC variables are not set up */ |
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xpNoRsvdPageAddr, /* 41: unable to get rsvd page's phys addr */ |
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xpInvalidPartid, /* 42: invalid partition ID */ |
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xpLocalPartid, /* 43: local partition ID */ |
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xpOtherGoingDown, /* 44: other side going down, reason unknown */ |
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xpSystemGoingDown, /* 45: system is going down, reason unknown */ |
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xpSystemHalt, /* 46: system is being halted */ |
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xpSystemReboot, /* 47: system is being rebooted */ |
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xpSystemPoweroff, /* 48: system is being powered off */ |
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xpDisconnecting, /* 49: channel disconnecting (closing) */ |
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xpOpenCloseError, /* 50: channel open/close protocol error */ |
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xpDisconnected, /* 51: channel disconnected (closed) */ |
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xpBteCopyError, /* 52: bte_copy() returned error */ |
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xpSalError, /* 53: sn SAL error */ |
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xpRsvdPageNotSet, /* 54: the reserved page is not set up */ |
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xpPayloadTooBig, /* 55: payload too large for message slot */ |
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xpUnsupported, /* 56: unsupported functionality or resource */ |
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xpNeedMoreInfo, /* 57: more info is needed by SAL */ |
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xpGruCopyError, /* 58: gru_copy_gru() returned error */ |
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xpGruSendMqError, /* 59: gru send message queue related error */ |
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xpBadChannelNumber, /* 60: invalid channel number */ |
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xpBadMsgType, /* 61: invalid message type */ |
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xpBiosError, /* 62: BIOS error */ |
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xpUnknownReason /* 63: unknown reason - must be last in enum */ |
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}; |
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/* |
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* Define the callout function type used by XPC to update the user on |
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* connection activity and state changes via the user function registered |
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* by xpc_connect(). |
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* |
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* Arguments: |
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* |
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* reason - reason code. |
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* partid - partition ID associated with condition. |
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* ch_number - channel # associated with condition. |
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* data - pointer to optional data. |
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* key - pointer to optional user-defined value provided as the "key" |
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* argument to xpc_connect(). |
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* |
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* A reason code of xpConnected indicates that a connection has been |
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* established to the specified partition on the specified channel. The data |
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* argument indicates the max number of entries allowed in the message queue. |
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* |
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* A reason code of xpMsgReceived indicates that a XPC message arrived from |
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* the specified partition on the specified channel. The data argument |
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* specifies the address of the message's payload. The user must call |
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* xpc_received() when finished with the payload. |
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* |
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* All other reason codes indicate failure. The data argmument is NULL. |
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* When a failure reason code is received, one can assume that the channel |
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* is not connected. |
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*/ |
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typedef void (*xpc_channel_func) (enum xp_retval reason, short partid, |
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int ch_number, void *data, void *key); |
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/* |
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* Define the callout function type used by XPC to notify the user of |
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* messages received and delivered via the user function registered by |
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* xpc_send_notify(). |
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* |
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* Arguments: |
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* |
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* reason - reason code. |
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* partid - partition ID associated with condition. |
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* ch_number - channel # associated with condition. |
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* key - pointer to optional user-defined value provided as the "key" |
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* argument to xpc_send_notify(). |
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* |
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* A reason code of xpMsgDelivered indicates that the message was delivered |
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* to the intended recipient and that they have acknowledged its receipt by |
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* calling xpc_received(). |
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* |
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* All other reason codes indicate failure. |
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* |
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* NOTE: The user defined function must be callable by an interrupt handler |
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* and thus cannot block. |
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*/ |
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typedef void (*xpc_notify_func) (enum xp_retval reason, short partid, |
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int ch_number, void *key); |
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/* |
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* The following is a registration entry. There is a global array of these, |
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* one per channel. It is used to record the connection registration made |
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* by the users of XPC. As long as a registration entry exists, for any |
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* partition that comes up, XPC will attempt to establish a connection on |
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* that channel. Notification that a connection has been made will occur via |
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* the xpc_channel_func function. |
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* |
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* The 'func' field points to the function to call when aynchronous |
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* notification is required for such events as: a connection established/lost, |
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* or an incoming message received, or an error condition encountered. A |
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* non-NULL 'func' field indicates that there is an active registration for |
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* the channel. |
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*/ |
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struct xpc_registration { |
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struct mutex mutex; |
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xpc_channel_func func; /* function to call */ |
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void *key; /* pointer to user's key */ |
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u16 nentries; /* #of msg entries in local msg queue */ |
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u16 entry_size; /* message queue's message entry size */ |
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u32 assigned_limit; /* limit on #of assigned kthreads */ |
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u32 idle_limit; /* limit on #of idle kthreads */ |
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} ____cacheline_aligned; |
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#define XPC_CHANNEL_REGISTERED(_c) (xpc_registrations[_c].func != NULL) |
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/* the following are valid xpc_send() or xpc_send_notify() flags */ |
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#define XPC_WAIT 0 /* wait flag */ |
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#define XPC_NOWAIT 1 /* no wait flag */ |
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struct xpc_interface { |
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void (*connect) (int); |
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void (*disconnect) (int); |
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enum xp_retval (*send) (short, int, u32, void *, u16); |
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enum xp_retval (*send_notify) (short, int, u32, void *, u16, |
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xpc_notify_func, void *); |
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void (*received) (short, int, void *); |
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enum xp_retval (*partid_to_nasids) (short, void *); |
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}; |
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extern struct xpc_interface xpc_interface; |
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extern void xpc_set_interface(void (*)(int), |
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void (*)(int), |
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enum xp_retval (*)(short, int, u32, void *, u16), |
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enum xp_retval (*)(short, int, u32, void *, u16, |
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xpc_notify_func, void *), |
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void (*)(short, int, void *), |
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enum xp_retval (*)(short, void *)); |
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extern void xpc_clear_interface(void); |
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extern enum xp_retval xpc_connect(int, xpc_channel_func, void *, u16, |
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u16, u32, u32); |
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extern void xpc_disconnect(int); |
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static inline enum xp_retval |
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xpc_send(short partid, int ch_number, u32 flags, void *payload, |
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u16 payload_size) |
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{ |
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if (!xpc_interface.send) |
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return xpNotLoaded; |
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return xpc_interface.send(partid, ch_number, flags, payload, |
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payload_size); |
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} |
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static inline enum xp_retval |
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xpc_send_notify(short partid, int ch_number, u32 flags, void *payload, |
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u16 payload_size, xpc_notify_func func, void *key) |
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{ |
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if (!xpc_interface.send_notify) |
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return xpNotLoaded; |
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return xpc_interface.send_notify(partid, ch_number, flags, payload, |
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payload_size, func, key); |
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} |
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static inline void |
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xpc_received(short partid, int ch_number, void *payload) |
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{ |
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if (xpc_interface.received) |
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xpc_interface.received(partid, ch_number, payload); |
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} |
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static inline enum xp_retval |
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xpc_partid_to_nasids(short partid, void *nasids) |
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{ |
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if (!xpc_interface.partid_to_nasids) |
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return xpNotLoaded; |
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return xpc_interface.partid_to_nasids(partid, nasids); |
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} |
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extern short xp_max_npartitions; |
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extern short xp_partition_id; |
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extern u8 xp_region_size; |
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extern unsigned long (*xp_pa) (void *); |
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extern unsigned long (*xp_socket_pa) (unsigned long); |
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extern enum xp_retval (*xp_remote_memcpy) (unsigned long, const unsigned long, |
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size_t); |
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extern int (*xp_cpu_to_nasid) (int); |
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extern enum xp_retval (*xp_expand_memprotect) (unsigned long, unsigned long); |
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extern enum xp_retval (*xp_restrict_memprotect) (unsigned long, unsigned long); |
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extern u64 xp_nofault_PIOR_target; |
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extern int xp_nofault_PIOR(void *); |
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extern int xp_error_PIOR(void); |
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extern struct device *xp; |
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extern enum xp_retval xp_init_uv(void); |
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extern void xp_exit_uv(void); |
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#endif /* _DRIVERS_MISC_SGIXP_XP_H */
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