drivers/misc/sgi-xp/xp.h

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2004-2008 Silicon Graphics, Inc. All rights reserved.
   7  */
   8
   9 /*
  10  * External Cross Partition (XP) structures and defines.
  11  */
  12
  13 #ifndef _DRIVERS_MISC_SGIXP_XP_H
  14 #define _DRIVERS_MISC_SGIXP_XP_H
  15
  16 #include <linux/mutex.h>
  17
  18 #if defined CONFIG_X86_UV || defined CONFIG_IA64_SGI_UV
  19 #include <asm/uv/uv.h>
  20 #define is_uv()         is_uv_system()
  21 #endif
  22
  23 #ifndef is_uv
  24 #define is_uv()         0
  25 #endif
  26
  27 #if defined CONFIG_IA64
  28 #include <asm/sn/arch.h>        /* defines is_shub1() and is_shub2() */
  29 #define is_shub()       ia64_platform_is("sn2")
  30 #endif
  31
  32 #ifndef is_shub1
  33 #define is_shub1()      0
  34 #endif
  35
  36 #ifndef is_shub2
  37 #define is_shub2()      0
  38 #endif
  39
  40 #ifndef is_shub
  41 #define is_shub()       0
  42 #endif
  43
  44 #ifdef USE_DBUG_ON
  45 #define DBUG_ON(condition)      BUG_ON(condition)
  46 #else
  47 #define DBUG_ON(condition)
  48 #endif
  49
  50 /*
  51  * Define the maximum number of partitions the system can possibly support.
  52  * It is based on the maximum number of hardware partitionable regions. The
  53  * term 'region' in this context refers to the minimum number of nodes that
  54  * can comprise an access protection grouping. The access protection is in
  55  * regards to memory, IPI and IOI.
  56  *
  57  * The maximum number of hardware partitionable regions is equal to the
  58  * maximum number of nodes in the entire system divided by the minimum number
  59  * of nodes that comprise an access protection grouping.
  60  */
  61 #define XP_MAX_NPARTITIONS_SN2  64
  62 #define XP_MAX_NPARTITIONS_UV   256
  63
  64 /*
  65  * XPC establishes channel connections between the local partition and any
  66  * other partition that is currently up. Over these channels, kernel-level
  67  * `users' can communicate with their counterparts on the other partitions.
  68  *
  69  * If the need for additional channels arises, one can simply increase
  70  * XPC_MAX_NCHANNELS accordingly. If the day should come where that number
  71  * exceeds the absolute MAXIMUM number of channels possible (eight), then one
  72  * will need to make changes to the XPC code to accommodate for this.
  73  *
  74  * The absolute maximum number of channels possible is limited to eight for
  75  * performance reasons on sn2 hardware. The internal cross partition structures
  76  * require sixteen bytes per channel, and eight allows all of this
  77  * interface-shared info to fit in one 128-byte cacheline.
  78  */
  79 #define XPC_MEM_CHANNEL         0       /* memory channel number */
  80 #define XPC_NET_CHANNEL         1       /* network channel number */
  81
  82 #define XPC_MAX_NCHANNELS       2       /* max #of channels allowed */
  83
  84 #if XPC_MAX_NCHANNELS > 8
  85 #error  XPC_MAX_NCHANNELS exceeds absolute MAXIMUM possible.
  86 #endif
  87
  88 /*
  89  * Define macro, XPC_MSG_SIZE(), is provided for the user
  90  * that wants to fit as many msg entries as possible in a given memory size
  91  * (e.g. a memory page).
  92  */
  93 #define XPC_MSG_MAX_SIZE        128
  94 #define XPC_MSG_HDR_MAX_SIZE    16
  95 #define XPC_MSG_PAYLOAD_MAX_SIZE (XPC_MSG_MAX_SIZE - XPC_MSG_HDR_MAX_SIZE)
  96
  97 #define XPC_MSG_SIZE(_payload_size) \
  98                                 ALIGN(XPC_MSG_HDR_MAX_SIZE + (_payload_size), \
  99                                       is_uv() ? 64 : 128)
 100
 101
 102 /*
 103  * Define the return values and values passed to user's callout functions.
 104  * (It is important to add new value codes at the end just preceding
 105  * xpUnknownReason, which must have the highest numerical value.)
 106  */
 107 enum xp_retval {
 108         xpSuccess = 0,
 109
 110         xpNotConnected,         /*  1: channel is not connected */
 111         xpConnected,            /*  2: channel connected (opened) */
 112         xpRETIRED1,             /*  3: (formerly xpDisconnected) */
 113
 114         xpMsgReceived,          /*  4: message received */
 115         xpMsgDelivered,         /*  5: message delivered and acknowledged */
 116
 117         xpRETIRED2,             /*  6: (formerly xpTransferFailed) */
 118
 119         xpNoWait,               /*  7: operation would require wait */
 120         xpRetry,                /*  8: retry operation */
 121         xpTimeout,              /*  9: timeout in xpc_allocate_msg_wait() */
 122         xpInterrupted,          /* 10: interrupted wait */
 123
 124         xpUnequalMsgSizes,      /* 11: message size disparity between sides */
 125         xpInvalidAddress,       /* 12: invalid address */
 126
 127         xpNoMemory,             /* 13: no memory available for XPC structures */
 128         xpLackOfResources,      /* 14: insufficient resources for operation */
 129         xpUnregistered,         /* 15: channel is not registered */
 130         xpAlreadyRegistered,    /* 16: channel is already registered */
 131
 132         xpPartitionDown,        /* 17: remote partition is down */
 133         xpNotLoaded,            /* 18: XPC module is not loaded */
 134         xpUnloading,            /* 19: this side is unloading XPC module */
 135
 136         xpBadMagic,             /* 20: XPC MAGIC string not found */
 137
 138         xpReactivating,         /* 21: remote partition was reactivated */
 139
 140         xpUnregistering,        /* 22: this side is unregistering channel */
 141         xpOtherUnregistering,   /* 23: other side is unregistering channel */
 142
 143         xpCloneKThread,         /* 24: cloning kernel thread */
 144         xpCloneKThreadFailed,   /* 25: cloning kernel thread failed */
 145
 146         xpNoHeartbeat,          /* 26: remote partition has no heartbeat */
 147
 148         xpPioReadError,         /* 27: PIO read error */
 149         xpPhysAddrRegFailed,    /* 28: registration of phys addr range failed */
 150
 151         xpRETIRED3,             /* 29: (formerly xpBteDirectoryError) */
 152         xpRETIRED4,             /* 30: (formerly xpBtePoisonError) */
 153         xpRETIRED5,             /* 31: (formerly xpBteWriteError) */
 154         xpRETIRED6,             /* 32: (formerly xpBteAccessError) */
 155         xpRETIRED7,             /* 33: (formerly xpBtePWriteError) */
 156         xpRETIRED8,             /* 34: (formerly xpBtePReadError) */
 157         xpRETIRED9,             /* 35: (formerly xpBteTimeOutError) */
 158         xpRETIRED10,            /* 36: (formerly xpBteXtalkError) */
 159         xpRETIRED11,            /* 37: (formerly xpBteNotAvailable) */
 160         xpRETIRED12,            /* 38: (formerly xpBteUnmappedError) */
 161
 162         xpBadVersion,           /* 39: bad version number */
 163         xpVarsNotSet,           /* 40: the XPC variables are not set up */
 164         xpNoRsvdPageAddr,       /* 41: unable to get rsvd page's phys addr */
 165         xpInvalidPartid,        /* 42: invalid partition ID */
 166         xpLocalPartid,          /* 43: local partition ID */
 167
 168         xpOtherGoingDown,       /* 44: other side going down, reason unknown */
 169         xpSystemGoingDown,      /* 45: system is going down, reason unknown */
 170         xpSystemHalt,           /* 46: system is being halted */
 171         xpSystemReboot,         /* 47: system is being rebooted */
 172         xpSystemPoweroff,       /* 48: system is being powered off */
 173
 174         xpDisconnecting,        /* 49: channel disconnecting (closing) */
 175
 176         xpOpenCloseError,       /* 50: channel open/close protocol error */
 177
 178         xpDisconnected,         /* 51: channel disconnected (closed) */
 179
 180         xpBteCopyError,         /* 52: bte_copy() returned error */
 181         xpSalError,             /* 53: sn SAL error */
 182         xpRsvdPageNotSet,       /* 54: the reserved page is not set up */
 183         xpPayloadTooBig,        /* 55: payload too large for message slot */
 184
 185         xpUnsupported,          /* 56: unsupported functionality or resource */
 186         xpNeedMoreInfo,         /* 57: more info is needed by SAL */
 187
 188         xpGruCopyError,         /* 58: gru_copy_gru() returned error */
 189         xpGruSendMqError,       /* 59: gru send message queue related error */
 190
 191         xpBadChannelNumber,     /* 60: invalid channel number */
 192         xpBadMsgType,           /* 61: invalid message type */
 193         xpBiosError,            /* 62: BIOS error */
 194
 195         xpUnknownReason         /* 63: unknown reason - must be last in enum */
 196 };
 197
 198 /*
 199  * Define the callout function type used by XPC to update the user on
 200  * connection activity and state changes via the user function registered
 201  * by xpc_connect().
 202  *
 203  * Arguments:
 204  *
 205  *      reason - reason code.
 206  *      partid - partition ID associated with condition.
 207  *      ch_number - channel # associated with condition.
 208  *      data - pointer to optional data.
 209  *      key - pointer to optional user-defined value provided as the "key"
 210  *            argument to xpc_connect().
 211  *
 212  * A reason code of xpConnected indicates that a connection has been
 213  * established to the specified partition on the specified channel. The data
 214  * argument indicates the max number of entries allowed in the message queue.
 215  *
 216  * A reason code of xpMsgReceived indicates that a XPC message arrived from
 217  * the specified partition on the specified channel. The data argument
 218  * specifies the address of the message's payload. The user must call
 219  * xpc_received() when finished with the payload.
 220  *
 221  * All other reason codes indicate failure. The data argmument is NULL.
 222  * When a failure reason code is received, one can assume that the channel
 223  * is not connected.
 224  */
 225 typedef void (*xpc_channel_func) (enum xp_retval reason, short partid,
 226                                   int ch_number, void *data, void *key);
 227
 228 /*
 229  * Define the callout function type used by XPC to notify the user of
 230  * messages received and delivered via the user function registered by
 231  * xpc_send_notify().
 232  *
 233  * Arguments:
 234  *
 235  *      reason - reason code.
 236  *      partid - partition ID associated with condition.
 237  *      ch_number - channel # associated with condition.
 238  *      key - pointer to optional user-defined value provided as the "key"
 239  *            argument to xpc_send_notify().
 240  *
 241  * A reason code of xpMsgDelivered indicates that the message was delivered
 242  * to the intended recipient and that they have acknowledged its receipt by
 243  * calling xpc_received().
 244  *
 245  * All other reason codes indicate failure.
 246  *
 247  * NOTE: The user defined function must be callable by an interrupt handler
 248  *       and thus cannot block.
 249  */
 250 typedef void (*xpc_notify_func) (enum xp_retval reason, short partid,
 251                                  int ch_number, void *key);
 252
 253 /*
 254  * The following is a registration entry. There is a global array of these,
 255  * one per channel. It is used to record the connection registration made
 256  * by the users of XPC. As long as a registration entry exists, for any
 257  * partition that comes up, XPC will attempt to establish a connection on
 258  * that channel. Notification that a connection has been made will occur via
 259  * the xpc_channel_func function.
 260  *
 261  * The 'func' field points to the function to call when aynchronous
 262  * notification is required for such events as: a connection established/lost,
 263  * or an incoming message received, or an error condition encountered. A
 264  * non-NULL 'func' field indicates that there is an active registration for
 265  * the channel.
 266  */
 267 struct xpc_registration {
 268         struct mutex mutex;
 269         xpc_channel_func func;  /* function to call */
 270         void *key;              /* pointer to user's key */
 271         u16 nentries;           /* #of msg entries in local msg queue */
 272         u16 entry_size;         /* message queue's message entry size */
 273         u32 assigned_limit;     /* limit on #of assigned kthreads */
 274         u32 idle_limit;         /* limit on #of idle kthreads */
 275 } ____cacheline_aligned;
 276
 277 #define XPC_CHANNEL_REGISTERED(_c)      (xpc_registrations[_c].func != NULL)
 278
 279 /* the following are valid xpc_send() or xpc_send_notify() flags */
 280 #define XPC_WAIT        0       /* wait flag */
 281 #define XPC_NOWAIT      1       /* no wait flag */
 282
 283 struct xpc_interface {
 284         void (*connect) (int);
 285         void (*disconnect) (int);
 286         enum xp_retval (*send) (short, int, u32, void *, u16);
 287         enum xp_retval (*send_notify) (short, int, u32, void *, u16,
 288                                         xpc_notify_func, void *);
 289         void (*received) (short, int, void *);
 290         enum xp_retval (*partid_to_nasids) (short, void *);
 291 };
 292
 293 extern struct xpc_interface xpc_interface;
 294
 295 extern void xpc_set_interface(void (*)(int),
 296                               void (*)(int),
 297                               enum xp_retval (*)(short, int, u32, void *, u16),
 298                               enum xp_retval (*)(short, int, u32, void *, u16,
 299                                                  xpc_notify_func, void *),
 300                               void (*)(short, int, void *),
 301                               enum xp_retval (*)(short, void *));
 302 extern void xpc_clear_interface(void);
 303
 304 extern enum xp_retval xpc_connect(int, xpc_channel_func, void *, u16,
 305                                    u16, u32, u32);
 306 extern void xpc_disconnect(int);
 307
 308 static inline enum xp_retval
 309 xpc_send(short partid, int ch_number, u32 flags, void *payload,
 310          u16 payload_size)
 311 {
 312         return xpc_interface.send(partid, ch_number, flags, payload,
 313                                   payload_size);
 314 }
 315
 316 static inline enum xp_retval
 317 xpc_send_notify(short partid, int ch_number, u32 flags, void *payload,
 318                 u16 payload_size, xpc_notify_func func, void *key)
 319 {
 320         return xpc_interface.send_notify(partid, ch_number, flags, payload,
 321                                          payload_size, func, key);
 322 }
 323
 324 static inline void
 325 xpc_received(short partid, int ch_number, void *payload)
 326 {
 327         return xpc_interface.received(partid, ch_number, payload);
 328 }
 329
 330 static inline enum xp_retval
 331 xpc_partid_to_nasids(short partid, void *nasids)
 332 {
 333         return xpc_interface.partid_to_nasids(partid, nasids);
 334 }
 335
 336 extern short xp_max_npartitions;
 337 extern short xp_partition_id;
 338 extern u8 xp_region_size;
 339
 340 extern unsigned long (*xp_pa) (void *);
 341 extern unsigned long (*xp_socket_pa) (unsigned long);
 342 extern enum xp_retval (*xp_remote_memcpy) (unsigned long, const unsigned long,
 343                        size_t);
 344 extern int (*xp_cpu_to_nasid) (int);
 345 extern enum xp_retval (*xp_expand_memprotect) (unsigned long, unsigned long);
 346 extern enum xp_retval (*xp_restrict_memprotect) (unsigned long, unsigned long);
 347
 348 extern u64 xp_nofault_PIOR_target;
 349 extern int xp_nofault_PIOR(void *);
 350 extern int xp_error_PIOR(void);
 351
 352 extern struct device *xp;
 353 extern enum xp_retval xp_init_sn2(void);
 354 extern enum xp_retval xp_init_uv(void);
 355 extern void xp_exit_sn2(void);
 356 extern void xp_exit_uv(void);
 357
 358 #endif /* _DRIVERS_MISC_SGIXP_XP_H */