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 #ifdef CONFIG_IA64 19 #include <asm/system.h> 20 #include <asm/sn/arch.h> /* defines is_shub1() and is_shub2() */ 21 #define is_shub() ia64_platform_is("sn2") 22 #define is_uv() ia64_platform_is("uv") 23 #endif 24 #ifdef CONFIG_X86_64 25 #include <asm/genapic.h> 26 #define is_uv() is_uv_system() 27 #endif 28 29 #ifndef is_shub1 30 #define is_shub1() 0 31 #endif 32 33 #ifndef is_shub2 34 #define is_shub2() 0 35 #endif 36 37 #ifndef is_shub 38 #define is_shub() 0 39 #endif 40 41 #ifndef is_uv 42 #define is_uv() 0 43 #endif 44 45 #ifdef USE_DBUG_ON 46 #define DBUG_ON(condition) BUG_ON(condition) 47 #else 48 #define DBUG_ON(condition) 49 #endif 50 51 /* 52 * Define the maximum number of partitions the system can possibly support. 53 * It is based on the maximum number of hardware partitionable regions. The 54 * term 'region' in this context refers to the minimum number of nodes that 55 * can comprise an access protection grouping. The access protection is in 56 * regards to memory, IPI and IOI. 57 * 58 * The maximum number of hardware partitionable regions is equal to the 59 * maximum number of nodes in the entire system divided by the minimum number 60 * of nodes that comprise an access protection grouping. 61 */ 62 #define XP_MAX_NPARTITIONS_SN2 64 63 #define XP_MAX_NPARTITIONS_UV 256 64 65 /* 66 * XPC establishes channel connections between the local partition and any 67 * other partition that is currently up. Over these channels, kernel-level 68 * `users' can communicate with their counterparts on the other partitions. 69 * 70 * If the need for additional channels arises, one can simply increase 71 * XPC_MAX_NCHANNELS accordingly. If the day should come where that number 72 * exceeds the absolute MAXIMUM number of channels possible (eight), then one 73 * will need to make changes to the XPC code to accommodate for this. 74 * 75 * The absolute maximum number of channels possible is limited to eight for 76 * performance reasons on sn2 hardware. The internal cross partition structures 77 * require sixteen bytes per channel, and eight allows all of this 78 * interface-shared info to fit in one 128-byte cacheline. 79 */ 80 #define XPC_MEM_CHANNEL 0 /* memory channel number */ 81 #define XPC_NET_CHANNEL 1 /* network channel number */ 82 83 #define XPC_MAX_NCHANNELS 2 /* max #of channels allowed */ 84 85 #if XPC_MAX_NCHANNELS > 8 86 #error XPC_MAX_NCHANNELS exceeds absolute MAXIMUM possible. 87 #endif 88 89 /* 90 * Define macro, XPC_MSG_SIZE(), is provided for the user 91 * that wants to fit as many msg entries as possible in a given memory size 92 * (e.g. a memory page). 93 */ 94 #define XPC_MSG_MAX_SIZE 128 95 #define XPC_MSG_HDR_MAX_SIZE 16 96 #define XPC_MSG_PAYLOAD_MAX_SIZE (XPC_MSG_MAX_SIZE - XPC_MSG_HDR_MAX_SIZE) 97 98 #define XPC_MSG_SIZE(_payload_size) \ 99 ALIGN(XPC_MSG_HDR_MAX_SIZE + (_payload_size), \ 100 is_uv() ? 64 : 128) 101 102 103 /* 104 * Define the return values and values passed to user's callout functions. 105 * (It is important to add new value codes at the end just preceding 106 * xpUnknownReason, which must have the highest numerical value.) 107 */ 108 enum xp_retval { 109 xpSuccess = 0, 110 111 xpNotConnected, /* 1: channel is not connected */ 112 xpConnected, /* 2: channel connected (opened) */ 113 xpRETIRED1, /* 3: (formerly xpDisconnected) */ 114 115 xpMsgReceived, /* 4: message received */ 116 xpMsgDelivered, /* 5: message delivered and acknowledged */ 117 118 xpRETIRED2, /* 6: (formerly xpTransferFailed) */ 119 120 xpNoWait, /* 7: operation would require wait */ 121 xpRetry, /* 8: retry operation */ 122 xpTimeout, /* 9: timeout in xpc_allocate_msg_wait() */ 123 xpInterrupted, /* 10: interrupted wait */ 124 125 xpUnequalMsgSizes, /* 11: message size disparity between sides */ 126 xpInvalidAddress, /* 12: invalid address */ 127 128 xpNoMemory, /* 13: no memory available for XPC structures */ 129 xpLackOfResources, /* 14: insufficient resources for operation */ 130 xpUnregistered, /* 15: channel is not registered */ 131 xpAlreadyRegistered, /* 16: channel is already registered */ 132 133 xpPartitionDown, /* 17: remote partition is down */ 134 xpNotLoaded, /* 18: XPC module is not loaded */ 135 xpUnloading, /* 19: this side is unloading XPC module */ 136 137 xpBadMagic, /* 20: XPC MAGIC string not found */ 138 139 xpReactivating, /* 21: remote partition was reactivated */ 140 141 xpUnregistering, /* 22: this side is unregistering channel */ 142 xpOtherUnregistering, /* 23: other side is unregistering channel */ 143 144 xpCloneKThread, /* 24: cloning kernel thread */ 145 xpCloneKThreadFailed, /* 25: cloning kernel thread failed */ 146 147 xpNoHeartbeat, /* 26: remote partition has no heartbeat */ 148 149 xpPioReadError, /* 27: PIO read error */ 150 xpPhysAddrRegFailed, /* 28: registration of phys addr range failed */ 151 152 xpRETIRED3, /* 29: (formerly xpBteDirectoryError) */ 153 xpRETIRED4, /* 30: (formerly xpBtePoisonError) */ 154 xpRETIRED5, /* 31: (formerly xpBteWriteError) */ 155 xpRETIRED6, /* 32: (formerly xpBteAccessError) */ 156 xpRETIRED7, /* 33: (formerly xpBtePWriteError) */ 157 xpRETIRED8, /* 34: (formerly xpBtePReadError) */ 158 xpRETIRED9, /* 35: (formerly xpBteTimeOutError) */ 159 xpRETIRED10, /* 36: (formerly xpBteXtalkError) */ 160 xpRETIRED11, /* 37: (formerly xpBteNotAvailable) */ 161 xpRETIRED12, /* 38: (formerly xpBteUnmappedError) */ 162 163 xpBadVersion, /* 39: bad version number */ 164 xpVarsNotSet, /* 40: the XPC variables are not set up */ 165 xpNoRsvdPageAddr, /* 41: unable to get rsvd page's phys addr */ 166 xpInvalidPartid, /* 42: invalid partition ID */ 167 xpLocalPartid, /* 43: local partition ID */ 168 169 xpOtherGoingDown, /* 44: other side going down, reason unknown */ 170 xpSystemGoingDown, /* 45: system is going down, reason unknown */ 171 xpSystemHalt, /* 46: system is being halted */ 172 xpSystemReboot, /* 47: system is being rebooted */ 173 xpSystemPoweroff, /* 48: system is being powered off */ 174 175 xpDisconnecting, /* 49: channel disconnecting (closing) */ 176 177 xpOpenCloseError, /* 50: channel open/close protocol error */ 178 179 xpDisconnected, /* 51: channel disconnected (closed) */ 180 181 xpBteCopyError, /* 52: bte_copy() returned error */ 182 xpSalError, /* 53: sn SAL error */ 183 xpRsvdPageNotSet, /* 54: the reserved page is not set up */ 184 xpPayloadTooBig, /* 55: payload too large for message slot */ 185 186 xpUnsupported, /* 56: unsupported functionality or resource */ 187 xpNeedMoreInfo, /* 57: more info is needed by SAL */ 188 189 xpGruCopyError, /* 58: gru_copy_gru() returned error */ 190 xpGruSendMqError, /* 59: gru send message queue related error */ 191 192 xpBadChannelNumber, /* 60: invalid channel number */ 193 xpBadMsgType, /* 60: invalid message type */ 194 195 xpUnknownReason /* 61: 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 enum xp_retval (*xp_remote_memcpy) (unsigned long, const unsigned long, 342 size_t); 343 extern int (*xp_cpu_to_nasid) (int); 344 345 extern u64 xp_nofault_PIOR_target; 346 extern int xp_nofault_PIOR(void *); 347 extern int xp_error_PIOR(void); 348 349 extern struct device *xp; 350 extern enum xp_retval xp_init_sn2(void); 351 extern enum xp_retval xp_init_uv(void); 352 extern void xp_exit_sn2(void); 353 extern void xp_exit_uv(void); 354 355 #endif /* _DRIVERS_MISC_SGIXP_XP_H */ 356