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Diffstat (limited to 'drivers/misc/sgi-xp/xp.h')
| -rw-r--r-- | drivers/misc/sgi-xp/xp.h | 341 |
1 files changed, 341 insertions, 0 deletions
diff --git a/drivers/misc/sgi-xp/xp.h b/drivers/misc/sgi-xp/xp.h new file mode 100644 index 000000000..f1336f43d --- /dev/null +++ b/drivers/misc/sgi-xp/xp.h @@ -0,0 +1,341 @@ +/* + * 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. + * + * (C) Copyright 2020 Hewlett Packard Enterprise Development LP + * 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 <linux/mutex.h> + +#if defined CONFIG_X86_UV || defined CONFIG_IA64_SGI_UV +#include <asm/uv/uv.h> +#endif + +#ifdef USE_DBUG_ON +#define DBUG_ON(condition) BUG_ON(condition) +#else +#define DBUG_ON(condition) +#endif + +/* + * Define the maximum number of partitions the system can possibly support. + * It is based on 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_NPARTITIONS_SN2 64 +#define XP_MAX_NPARTITIONS_UV 256 + +/* + * 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. + * + * If the need for additional channels arises, one can simply increase + * XPC_MAX_NCHANNELS accordingly. If the day should come where that number + * exceeds the absolute MAXIMUM number of channels possible (eight), then one + * will need to make changes to the XPC code to accommodate for this. + * + * The absolute maximum number of channels possible is limited to eight for + * performance reasons on sn2 hardware. The internal cross partition structures + * require sixteen bytes per channel, and eight allows all of this + * interface-shared info to fit in one 128-byte cacheline. + */ +#define XPC_MEM_CHANNEL 0 /* memory channel number */ +#define XPC_NET_CHANNEL 1 /* network channel number */ + +#define XPC_MAX_NCHANNELS 2 /* max #of channels allowed */ + +#if XPC_MAX_NCHANNELS > 8 +#error XPC_MAX_NCHANNELS exceeds absolute MAXIMUM possible. +#endif + +/* + * Define 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). + */ +#define XPC_MSG_MAX_SIZE 128 +#define XPC_MSG_HDR_MAX_SIZE 16 +#define XPC_MSG_PAYLOAD_MAX_SIZE (XPC_MSG_MAX_SIZE - XPC_MSG_HDR_MAX_SIZE) + +#define XPC_MSG_SIZE(_payload_size) \ + ALIGN(XPC_MSG_HDR_MAX_SIZE + (_payload_size), \ + is_uv_system() ? 64 : 128) + + +/* + * 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 */ + xpSalError, /* 53: sn SAL error */ + xpRsvdPageNotSet, /* 54: the reserved page is not set up */ + xpPayloadTooBig, /* 55: payload too large for message slot */ + + xpUnsupported, /* 56: unsupported functionality or resource */ + xpNeedMoreInfo, /* 57: more info is needed by SAL */ + + xpGruCopyError, /* 58: gru_copy_gru() returned error */ + xpGruSendMqError, /* 59: gru send message queue related error */ + + xpBadChannelNumber, /* 60: invalid channel number */ + xpBadMsgType, /* 61: invalid message type */ + xpBiosError, /* 62: BIOS error */ + + xpUnknownReason /* 63: 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. + * + * NOTE: The user defined function must be callable by an interrupt handler + * and thus cannot block. + */ +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 entry_size; /* message queue's message entry 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_send() or xpc_send_notify() 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 (*send) (short, int, u32, void *, u16); + enum xp_retval (*send_notify) (short, int, u32, void *, u16, + 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 *, u16), + enum xp_retval (*)(short, int, u32, void *, u16, + 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_send(short partid, int ch_number, u32 flags, void *payload, + u16 payload_size) +{ + if (!xpc_interface.send) + return xpNotLoaded; + + return xpc_interface.send(partid, ch_number, flags, payload, + payload_size); +} + +static inline enum xp_retval +xpc_send_notify(short partid, int ch_number, u32 flags, void *payload, + u16 payload_size, xpc_notify_func func, void *key) +{ + if (!xpc_interface.send_notify) + return xpNotLoaded; + + return xpc_interface.send_notify(partid, ch_number, flags, payload, + payload_size, func, key); +} + +static inline void +xpc_received(short partid, int ch_number, void *payload) +{ + if (xpc_interface.received) + xpc_interface.received(partid, ch_number, payload); +} + +static inline enum xp_retval +xpc_partid_to_nasids(short partid, void *nasids) +{ + if (!xpc_interface.partid_to_nasids) + return xpNotLoaded; + + return xpc_interface.partid_to_nasids(partid, nasids); +} + +extern short xp_max_npartitions; +extern short xp_partition_id; +extern u8 xp_region_size; + +extern unsigned long (*xp_pa) (void *); +extern unsigned long (*xp_socket_pa) (unsigned long); +extern enum xp_retval (*xp_remote_memcpy) (unsigned long, const unsigned long, + size_t); +extern int (*xp_cpu_to_nasid) (int); +extern enum xp_retval (*xp_expand_memprotect) (unsigned long, unsigned long); +extern enum xp_retval (*xp_restrict_memprotect) (unsigned long, unsigned long); + +extern struct device *xp; +extern enum xp_retval xp_init_uv(void); +extern void xp_exit_uv(void); + +#endif /* _DRIVERS_MISC_SGIXP_XP_H */ |