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 */ 359