/* * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 2004-2008 Silicon Graphics, Inc. All rights reserved. */ /* * External Cross Partition (XP) structures and defines. */ #ifndef _DRIVERS_MISC_SGIXP_XP_H #define _DRIVERS_MISC_SGIXP_XP_H #include #include #include #include #include #ifdef USE_DBUG_ON #define DBUG_ON(condition) BUG_ON(condition) #else #define DBUG_ON(condition) #endif /* * Define the maximum number of logically defined partitions the system * can support. It is constrained by the maximum number of hardware * partitionable regions. The term 'region' in this context refers to the * minimum number of nodes that can comprise an access protection grouping. * The access protection is in regards to memory, IPI and IOI. * * The maximum number of hardware partitionable regions is equal to the * maximum number of nodes in the entire system divided by the minimum number * of nodes that comprise an access protection grouping. */ #define XP_MAX_PARTITIONS 64 /* * Define the number of u64s required to represent all the C-brick nasids * as a bitmap. The cross-partition kernel modules deal only with * C-brick nasids, thus the need for bitmaps which don't account for * odd-numbered (non C-brick) nasids. */ #define XP_MAX_PHYSNODE_ID (MAX_NUMALINK_NODES / 2) #define XP_NASID_MASK_BYTES ((XP_MAX_PHYSNODE_ID + 7) / 8) #define XP_NASID_MASK_WORDS ((XP_MAX_PHYSNODE_ID + 63) / 64) /* * Wrapper for bte_copy() that should it return a failure status will retry * the bte_copy() once in the hope that the failure was due to a temporary * aberration (i.e., the link going down temporarily). * * src - physical address of the source of the transfer. * vdst - virtual address of the destination of the transfer. * len - number of bytes to transfer from source to destination. * mode - see bte_copy() for definition. * notification - see bte_copy() for definition. * * Note: xp_bte_copy() should never be called while holding a spinlock. */ static inline bte_result_t xp_bte_copy(u64 src, u64 vdst, u64 len, u64 mode, void *notification) { bte_result_t ret; u64 pdst = ia64_tpa(vdst); /* * Ensure that the physically mapped memory is contiguous. * * We do this by ensuring that the memory is from region 7 only. * If the need should arise to use memory from one of the other * regions, then modify the BUG_ON() statement to ensure that the * memory from that region is always physically contiguous. */ BUG_ON(REGION_NUMBER(vdst) != RGN_KERNEL); ret = bte_copy(src, pdst, len, mode, notification); if ((ret != BTE_SUCCESS) && BTE_ERROR_RETRY(ret)) { if (!in_interrupt()) cond_resched(); ret = bte_copy(src, pdst, len, mode, notification); } return ret; } /* * XPC establishes channel connections between the local partition and any * other partition that is currently up. Over these channels, kernel-level * `users' can communicate with their counterparts on the other partitions. * * The maxinum number of channels is limited to eight. For performance reasons, * the internal cross partition structures require sixteen bytes per channel, * and eight allows all of this interface-shared info to fit in one cache line. * * XPC_NCHANNELS reflects the total number of channels currently defined. * If the need for additional channels arises, one can simply increase * XPC_NCHANNELS accordingly. If the day should come where that number * exceeds the MAXIMUM number of channels allowed (eight), then one will need * to make changes to the XPC code to allow for this. */ #define XPC_MEM_CHANNEL 0 /* memory channel number */ #define XPC_NET_CHANNEL 1 /* network channel number */ #define XPC_NCHANNELS 2 /* #of defined channels */ #define XPC_MAX_NCHANNELS 8 /* max #of channels allowed */ #if XPC_NCHANNELS > XPC_MAX_NCHANNELS #error XPC_NCHANNELS exceeds MAXIMUM allowed. #endif /* * The format of an XPC message is as follows: * * +-------+--------------------------------+ * | flags |////////////////////////////////| * +-------+--------------------------------+ * | message # | * +----------------------------------------+ * | payload (user-defined message) | * | | * : * | | * +----------------------------------------+ * * The size of the payload is defined by the user via xpc_connect(). A user- * defined message resides in the payload area. * * The user should have no dealings with the message header, but only the * message's payload. When a message entry is allocated (via xpc_allocate()) * a pointer to the payload area is returned and not the actual beginning of * the XPC message. The user then constructs a message in the payload area * and passes that pointer as an argument on xpc_send() or xpc_send_notify(). * * The size of a message entry (within a message queue) must be a cacheline * sized multiple in order to facilitate the BTE transfer of messages from one * message queue to another. A macro, XPC_MSG_SIZE(), is provided for the user * that wants to fit as many msg entries as possible in a given memory size * (e.g. a memory page). */ struct xpc_msg { u8 flags; /* FOR XPC INTERNAL USE ONLY */ u8 reserved[7]; /* FOR XPC INTERNAL USE ONLY */ s64 number; /* FOR XPC INTERNAL USE ONLY */ u64 payload; /* user defined portion of message */ }; #define XPC_MSG_PAYLOAD_OFFSET (u64) (&((struct xpc_msg *)0)->payload) #define XPC_MSG_SIZE(_payload_size) \ L1_CACHE_ALIGN(XPC_MSG_PAYLOAD_OFFSET + (_payload_size)) /* * Define the return values and values passed to user's callout functions. * (It is important to add new value codes at the end just preceding * xpUnknownReason, which must have the highest numerical value.) */ enum xp_retval { xpSuccess = 0, xpNotConnected, /* 1: channel is not connected */ xpConnected, /* 2: channel connected (opened) */ xpRETIRED1, /* 3: (formerly xpDisconnected) */ xpMsgReceived, /* 4: message received */ xpMsgDelivered, /* 5: message delivered and acknowledged */ xpRETIRED2, /* 6: (formerly xpTransferFailed) */ xpNoWait, /* 7: operation would require wait */ xpRetry, /* 8: retry operation */ xpTimeout, /* 9: timeout in xpc_allocate_msg_wait() */ xpInterrupted, /* 10: interrupted wait */ xpUnequalMsgSizes, /* 11: message size disparity between sides */ xpInvalidAddress, /* 12: invalid address */ xpNoMemory, /* 13: no memory available for XPC structures */ xpLackOfResources, /* 14: insufficient resources for operation */ xpUnregistered, /* 15: channel is not registered */ xpAlreadyRegistered, /* 16: channel is already registered */ xpPartitionDown, /* 17: remote partition is down */ xpNotLoaded, /* 18: XPC module is not loaded */ xpUnloading, /* 19: this side is unloading XPC module */ xpBadMagic, /* 20: XPC MAGIC string not found */ xpReactivating, /* 21: remote partition was reactivated */ xpUnregistering, /* 22: this side is unregistering channel */ xpOtherUnregistering, /* 23: other side is unregistering channel */ xpCloneKThread, /* 24: cloning kernel thread */ xpCloneKThreadFailed, /* 25: cloning kernel thread failed */ xpNoHeartbeat, /* 26: remote partition has no heartbeat */ xpPioReadError, /* 27: PIO read error */ xpPhysAddrRegFailed, /* 28: registration of phys addr range failed */ xpRETIRED3, /* 29: (formerly xpBteDirectoryError) */ xpRETIRED4, /* 30: (formerly xpBtePoisonError) */ xpRETIRED5, /* 31: (formerly xpBteWriteError) */ xpRETIRED6, /* 32: (formerly xpBteAccessError) */ xpRETIRED7, /* 33: (formerly xpBtePWriteError) */ xpRETIRED8, /* 34: (formerly xpBtePReadError) */ xpRETIRED9, /* 35: (formerly xpBteTimeOutError) */ xpRETIRED10, /* 36: (formerly xpBteXtalkError) */ xpRETIRED11, /* 37: (formerly xpBteNotAvailable) */ xpRETIRED12, /* 38: (formerly xpBteUnmappedError) */ xpBadVersion, /* 39: bad version number */ xpVarsNotSet, /* 40: the XPC variables are not set up */ xpNoRsvdPageAddr, /* 41: unable to get rsvd page's phys addr */ xpInvalidPartid, /* 42: invalid partition ID */ xpLocalPartid, /* 43: local partition ID */ xpOtherGoingDown, /* 44: other side going down, reason unknown */ xpSystemGoingDown, /* 45: system is going down, reason unknown */ xpSystemHalt, /* 46: system is being halted */ xpSystemReboot, /* 47: system is being rebooted */ xpSystemPoweroff, /* 48: system is being powered off */ xpDisconnecting, /* 49: channel disconnecting (closing) */ xpOpenCloseError, /* 50: channel open/close protocol error */ xpDisconnected, /* 51: channel disconnected (closed) */ xpBteCopyError, /* 52: bte_copy() returned error */ xpUnknownReason /* 53: unknown reason - must be last in enum */ }; /* * Define the callout function type used by XPC to update the user on * connection activity and state changes via the user function registered * by xpc_connect(). * * Arguments: * * reason - reason code. * partid - partition ID associated with condition. * ch_number - channel # associated with condition. * data - pointer to optional data. * key - pointer to optional user-defined value provided as the "key" * argument to xpc_connect(). * * A reason code of xpConnected indicates that a connection has been * established to the specified partition on the specified channel. The data * argument indicates the max number of entries allowed in the message queue. * * A reason code of xpMsgReceived indicates that a XPC message arrived from * the specified partition on the specified channel. The data argument * specifies the address of the message's payload. The user must call * xpc_received() when finished with the payload. * * All other reason codes indicate failure. The data argmument is NULL. * When a failure reason code is received, one can assume that the channel * is not connected. */ typedef void (*xpc_channel_func) (enum xp_retval reason, short partid, int ch_number, void *data, void *key); /* * Define the callout function type used by XPC to notify the user of * messages received and delivered via the user function registered by * xpc_send_notify(). * * Arguments: * * reason - reason code. * partid - partition ID associated with condition. * ch_number - channel # associated with condition. * key - pointer to optional user-defined value provided as the "key" * argument to xpc_send_notify(). * * A reason code of xpMsgDelivered indicates that the message was delivered * to the intended recipient and that they have acknowledged its receipt by * calling xpc_received(). * * All other reason codes indicate failure. */ typedef void (*xpc_notify_func) (enum xp_retval reason, short partid, int ch_number, void *key); /* * The following is a registration entry. There is a global array of these, * one per channel. It is used to record the connection registration made * by the users of XPC. As long as a registration entry exists, for any * partition that comes up, XPC will attempt to establish a connection on * that channel. Notification that a connection has been made will occur via * the xpc_channel_func function. * * The 'func' field points to the function to call when aynchronous * notification is required for such events as: a connection established/lost, * or an incoming message received, or an error condition encountered. A * non-NULL 'func' field indicates that there is an active registration for * the channel. */ struct xpc_registration { struct mutex mutex; xpc_channel_func func; /* function to call */ void *key; /* pointer to user's key */ u16 nentries; /* #of msg entries in local msg queue */ u16 msg_size; /* message queue's message size */ u32 assigned_limit; /* limit on #of assigned kthreads */ u32 idle_limit; /* limit on #of idle kthreads */ } ____cacheline_aligned; #define XPC_CHANNEL_REGISTERED(_c) (xpc_registrations[_c].func != NULL) /* the following are valid xpc_allocate() flags */ #define XPC_WAIT 0 /* wait flag */ #define XPC_NOWAIT 1 /* no wait flag */ struct xpc_interface { void (*connect) (int); void (*disconnect) (int); enum xp_retval (*allocate) (short, int, u32, void **); enum xp_retval (*send) (short, int, void *); enum xp_retval (*send_notify) (short, int, void *, xpc_notify_func, void *); void (*received) (short, int, void *); enum xp_retval (*partid_to_nasids) (short, void *); }; extern struct xpc_interface xpc_interface; extern void xpc_set_interface(void (*)(int), void (*)(int), enum xp_retval (*)(short, int, u32, void **), enum xp_retval (*)(short, int, void *), enum xp_retval (*)(short, int, void *, xpc_notify_func, void *), void (*)(short, int, void *), enum xp_retval (*)(short, void *)); extern void xpc_clear_interface(void); extern enum xp_retval xpc_connect(int, xpc_channel_func, void *, u16, u16, u32, u32); extern void xpc_disconnect(int); static inline enum xp_retval xpc_allocate(short partid, int ch_number, u32 flags, void **payload) { return xpc_interface.allocate(partid, ch_number, flags, payload); } static inline enum xp_retval xpc_send(short partid, int ch_number, void *payload) { return xpc_interface.send(partid, ch_number, payload); } static inline enum xp_retval xpc_send_notify(short partid, int ch_number, void *payload, xpc_notify_func func, void *key) { return xpc_interface.send_notify(partid, ch_number, payload, func, key); } static inline void xpc_received(short partid, int ch_number, void *payload) { return xpc_interface.received(partid, ch_number, payload); } static inline enum xp_retval xpc_partid_to_nasids(short partid, void *nasids) { return xpc_interface.partid_to_nasids(partid, nasids); } extern u64 xp_nofault_PIOR_target; extern int xp_nofault_PIOR(void *); extern int xp_error_PIOR(void); #endif /* _DRIVERS_MISC_SGIXP_XP_H */