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 #ifdef CONFIG_IA64_SGI_UV 23 #define is_uv() ia64_platform_is("uv") 24 #else 25 #define is_uv() 0 26 #endif 27 #endif 28 #ifdef CONFIG_X86_64 29 #include <asm/genapic.h> 30 #define is_uv() is_uv_system() 31 #endif 32 33 #ifndef is_shub1 34 #define is_shub1() 0 35 #endif 36 37 #ifndef is_shub2 38 #define is_shub2() 0 39 #endif 40 41 #ifndef is_shub 42 #define is_shub() 0 43 #endif 44 45 #ifndef is_uv 46 #define is_uv() 0 47 #endif 48 49 #ifdef USE_DBUG_ON 50 #define DBUG_ON(condition) BUG_ON(condition) 51 #else 52 #define DBUG_ON(condition) 53 #endif 54 55 /* 56 * Define the maximum number of partitions the system can possibly support. 57 * It is based on the maximum number of hardware partitionable regions. The 58 * term 'region' in this context refers to the minimum number of nodes that 59 * can comprise an access protection grouping. The access protection is in 60 * regards to memory, IPI and IOI. 61 * 62 * The maximum number of hardware partitionable regions is equal to the 63 * maximum number of nodes in the entire system divided by the minimum number 64 * of nodes that comprise an access protection grouping. 65 */ 66 #define XP_MAX_NPARTITIONS_SN2 64 67 #define XP_MAX_NPARTITIONS_UV 256 68 69 /* 70 * XPC establishes channel connections between the local partition and any 71 * other partition that is currently up. Over these channels, kernel-level 72 * `users' can communicate with their counterparts on the other partitions. 73 * 74 * If the need for additional channels arises, one can simply increase 75 * XPC_MAX_NCHANNELS accordingly. If the day should come where that number 76 * exceeds the absolute MAXIMUM number of channels possible (eight), then one 77 * will need to make changes to the XPC code to accommodate for this. 78 * 79 * The absolute maximum number of channels possible is limited to eight for 80 * performance reasons on sn2 hardware. The internal cross partition structures 81 * require sixteen bytes per channel, and eight allows all of this 82 * interface-shared info to fit in one 128-byte cacheline. 83 */ 84 #define XPC_MEM_CHANNEL 0 /* memory channel number */ 85 #define XPC_NET_CHANNEL 1 /* network channel number */ 86 87 #define XPC_MAX_NCHANNELS 2 /* max #of channels allowed */ 88 89 #if XPC_MAX_NCHANNELS > 8 90 #error XPC_MAX_NCHANNELS exceeds absolute MAXIMUM possible. 91 #endif 92 93 /* 94 * Define macro, XPC_MSG_SIZE(), is provided for the user 95 * that wants to fit as many msg entries as possible in a given memory size 96 * (e.g. a memory page). 97 */ 98 #define XPC_MSG_MAX_SIZE 128 99 #define XPC_MSG_HDR_MAX_SIZE 16 100 #define XPC_MSG_PAYLOAD_MAX_SIZE (XPC_MSG_MAX_SIZE - XPC_MSG_HDR_MAX_SIZE) 101 102 #define XPC_MSG_SIZE(_payload_size) \ 103 ALIGN(XPC_MSG_HDR_MAX_SIZE + (_payload_size), \ 104 is_uv() ? 64 : 128) 105 106 107 /* 108 * Define the return values and values passed to user's callout functions. 109 * (It is important to add new value codes at the end just preceding 110 * xpUnknownReason, which must have the highest numerical value.) 111 */ 112 enum xp_retval { 113 xpSuccess = 0, 114 115 xpNotConnected, /* 1: channel is not connected */ 116 xpConnected, /* 2: channel connected (opened) */ 117 xpRETIRED1, /* 3: (formerly xpDisconnected) */ 118 119 xpMsgReceived, /* 4: message received */ 120 xpMsgDelivered, /* 5: message delivered and acknowledged */ 121 122 xpRETIRED2, /* 6: (formerly xpTransferFailed) */ 123 124 xpNoWait, /* 7: operation would require wait */ 125 xpRetry, /* 8: retry operation */ 126 xpTimeout, /* 9: timeout in xpc_allocate_msg_wait() */ 127 xpInterrupted, /* 10: interrupted wait */ 128 129 xpUnequalMsgSizes, /* 11: message size disparity between sides */ 130 xpInvalidAddress, /* 12: invalid address */ 131 132 xpNoMemory, /* 13: no memory available for XPC structures */ 133 xpLackOfResources, /* 14: insufficient resources for operation */ 134 xpUnregistered, /* 15: channel is not registered */ 135 xpAlreadyRegistered, /* 16: channel is already registered */ 136 137 xpPartitionDown, /* 17: remote partition is down */ 138 xpNotLoaded, /* 18: XPC module is not loaded */ 139 xpUnloading, /* 19: this side is unloading XPC module */ 140 141 xpBadMagic, /* 20: XPC MAGIC string not found */ 142 143 xpReactivating, /* 21: remote partition was reactivated */ 144 145 xpUnregistering, /* 22: this side is unregistering channel */ 146 xpOtherUnregistering, /* 23: other side is unregistering channel */ 147 148 xpCloneKThread, /* 24: cloning kernel thread */ 149 xpCloneKThreadFailed, /* 25: cloning kernel thread failed */ 150 151 xpNoHeartbeat, /* 26: remote partition has no heartbeat */ 152 153 xpPioReadError, /* 27: PIO read error */ 154 xpPhysAddrRegFailed, /* 28: registration of phys addr range failed */ 155 156 xpRETIRED3, /* 29: (formerly xpBteDirectoryError) */ 157 xpRETIRED4, /* 30: (formerly xpBtePoisonError) */ 158 xpRETIRED5, /* 31: (formerly xpBteWriteError) */ 159 xpRETIRED6, /* 32: (formerly xpBteAccessError) */ 160 xpRETIRED7, /* 33: (formerly xpBtePWriteError) */ 161 xpRETIRED8, /* 34: (formerly xpBtePReadError) */ 162 xpRETIRED9, /* 35: (formerly xpBteTimeOutError) */ 163 xpRETIRED10, /* 36: (formerly xpBteXtalkError) */ 164 xpRETIRED11, /* 37: (formerly xpBteNotAvailable) */ 165 xpRETIRED12, /* 38: (formerly xpBteUnmappedError) */ 166 167 xpBadVersion, /* 39: bad version number */ 168 xpVarsNotSet, /* 40: the XPC variables are not set up */ 169 xpNoRsvdPageAddr, /* 41: unable to get rsvd page's phys addr */ 170 xpInvalidPartid, /* 42: invalid partition ID */ 171 xpLocalPartid, /* 43: local partition ID */ 172 173 xpOtherGoingDown, /* 44: other side going down, reason unknown */ 174 xpSystemGoingDown, /* 45: system is going down, reason unknown */ 175 xpSystemHalt, /* 46: system is being halted */ 176 xpSystemReboot, /* 47: system is being rebooted */ 177 xpSystemPoweroff, /* 48: system is being powered off */ 178 179 xpDisconnecting, /* 49: channel disconnecting (closing) */ 180 181 xpOpenCloseError, /* 50: channel open/close protocol error */ 182 183 xpDisconnected, /* 51: channel disconnected (closed) */ 184 185 xpBteCopyError, /* 52: bte_copy() returned error */ 186 xpSalError, /* 53: sn SAL error */ 187 xpRsvdPageNotSet, /* 54: the reserved page is not set up */ 188 xpPayloadTooBig, /* 55: payload too large for message slot */ 189 190 xpUnsupported, /* 56: unsupported functionality or resource */ 191 xpNeedMoreInfo, /* 57: more info is needed by SAL */ 192 193 xpGruCopyError, /* 58: gru_copy_gru() returned error */ 194 xpGruSendMqError, /* 59: gru send message queue related error */ 195 196 xpBadChannelNumber, /* 60: invalid channel number */ 197 xpBadMsgType, /* 60: invalid message type */ 198 199 xpUnknownReason /* 61: unknown reason - must be last in enum */ 200 }; 201 202 /* 203 * Define the callout function type used by XPC to update the user on 204 * connection activity and state changes via the user function registered 205 * by xpc_connect(). 206 * 207 * Arguments: 208 * 209 * reason - reason code. 210 * partid - partition ID associated with condition. 211 * ch_number - channel # associated with condition. 212 * data - pointer to optional data. 213 * key - pointer to optional user-defined value provided as the "key" 214 * argument to xpc_connect(). 215 * 216 * A reason code of xpConnected indicates that a connection has been 217 * established to the specified partition on the specified channel. The data 218 * argument indicates the max number of entries allowed in the message queue. 219 * 220 * A reason code of xpMsgReceived indicates that a XPC message arrived from 221 * the specified partition on the specified channel. The data argument 222 * specifies the address of the message's payload. The user must call 223 * xpc_received() when finished with the payload. 224 * 225 * All other reason codes indicate failure. The data argmument is NULL. 226 * When a failure reason code is received, one can assume that the channel 227 * is not connected. 228 */ 229 typedef void (*xpc_channel_func) (enum xp_retval reason, short partid, 230 int ch_number, void *data, void *key); 231 232 /* 233 * Define the callout function type used by XPC to notify the user of 234 * messages received and delivered via the user function registered by 235 * xpc_send_notify(). 236 * 237 * Arguments: 238 * 239 * reason - reason code. 240 * partid - partition ID associated with condition. 241 * ch_number - channel # associated with condition. 242 * key - pointer to optional user-defined value provided as the "key" 243 * argument to xpc_send_notify(). 244 * 245 * A reason code of xpMsgDelivered indicates that the message was delivered 246 * to the intended recipient and that they have acknowledged its receipt by 247 * calling xpc_received(). 248 * 249 * All other reason codes indicate failure. 250 * 251 * NOTE: The user defined function must be callable by an interrupt handler 252 * and thus cannot block. 253 */ 254 typedef void (*xpc_notify_func) (enum xp_retval reason, short partid, 255 int ch_number, void *key); 256 257 /* 258 * The following is a registration entry. There is a global array of these, 259 * one per channel. It is used to record the connection registration made 260 * by the users of XPC. As long as a registration entry exists, for any 261 * partition that comes up, XPC will attempt to establish a connection on 262 * that channel. Notification that a connection has been made will occur via 263 * the xpc_channel_func function. 264 * 265 * The 'func' field points to the function to call when aynchronous 266 * notification is required for such events as: a connection established/lost, 267 * or an incoming message received, or an error condition encountered. A 268 * non-NULL 'func' field indicates that there is an active registration for 269 * the channel. 270 */ 271 struct xpc_registration { 272 struct mutex mutex; 273 xpc_channel_func func; /* function to call */ 274 void *key; /* pointer to user's key */ 275 u16 nentries; /* #of msg entries in local msg queue */ 276 u16 entry_size; /* message queue's message entry size */ 277 u32 assigned_limit; /* limit on #of assigned kthreads */ 278 u32 idle_limit; /* limit on #of idle kthreads */ 279 } ____cacheline_aligned; 280 281 #define XPC_CHANNEL_REGISTERED(_c) (xpc_registrations[_c].func != NULL) 282 283 /* the following are valid xpc_send() or xpc_send_notify() flags */ 284 #define XPC_WAIT 0 /* wait flag */ 285 #define XPC_NOWAIT 1 /* no wait flag */ 286 287 struct xpc_interface { 288 void (*connect) (int); 289 void (*disconnect) (int); 290 enum xp_retval (*send) (short, int, u32, void *, u16); 291 enum xp_retval (*send_notify) (short, int, u32, void *, u16, 292 xpc_notify_func, void *); 293 void (*received) (short, int, void *); 294 enum xp_retval (*partid_to_nasids) (short, void *); 295 }; 296 297 extern struct xpc_interface xpc_interface; 298 299 extern void xpc_set_interface(void (*)(int), 300 void (*)(int), 301 enum xp_retval (*)(short, int, u32, void *, u16), 302 enum xp_retval (*)(short, int, u32, void *, u16, 303 xpc_notify_func, void *), 304 void (*)(short, int, void *), 305 enum xp_retval (*)(short, void *)); 306 extern void xpc_clear_interface(void); 307 308 extern enum xp_retval xpc_connect(int, xpc_channel_func, void *, u16, 309 u16, u32, u32); 310 extern void xpc_disconnect(int); 311 312 static inline enum xp_retval 313 xpc_send(short partid, int ch_number, u32 flags, void *payload, 314 u16 payload_size) 315 { 316 return xpc_interface.send(partid, ch_number, flags, payload, 317 payload_size); 318 } 319 320 static inline enum xp_retval 321 xpc_send_notify(short partid, int ch_number, u32 flags, void *payload, 322 u16 payload_size, xpc_notify_func func, void *key) 323 { 324 return xpc_interface.send_notify(partid, ch_number, flags, payload, 325 payload_size, func, key); 326 } 327 328 static inline void 329 xpc_received(short partid, int ch_number, void *payload) 330 { 331 return xpc_interface.received(partid, ch_number, payload); 332 } 333 334 static inline enum xp_retval 335 xpc_partid_to_nasids(short partid, void *nasids) 336 { 337 return xpc_interface.partid_to_nasids(partid, nasids); 338 } 339 340 extern short xp_max_npartitions; 341 extern short xp_partition_id; 342 extern u8 xp_region_size; 343 344 extern unsigned long (*xp_pa) (void *); 345 extern enum xp_retval (*xp_remote_memcpy) (unsigned long, const unsigned long, 346 size_t); 347 extern int (*xp_cpu_to_nasid) (int); 348 349 extern u64 xp_nofault_PIOR_target; 350 extern int xp_nofault_PIOR(void *); 351 extern int xp_error_PIOR(void); 352 353 extern struct device *xp; 354 extern enum xp_retval xp_init_sn2(void); 355 extern enum xp_retval xp_init_uv(void); 356 extern void xp_exit_sn2(void); 357 extern void xp_exit_uv(void); 358 359 #endif /* _DRIVERS_MISC_SGIXP_XP_H */ 360