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
6 * Copyright (C) 2004-2008 Silicon Graphics, Inc. All rights reserved.
10 * External Cross Partition (XP) structures and defines.
13 #ifndef _DRIVERS_MISC_SGIXP_XP_H
14 #define _DRIVERS_MISC_SGIXP_XP_H
16 #include <linux/cache.h>
17 #include <linux/hardirq.h>
18 #include <linux/mutex.h>
19 #include <asm/sn/types.h>
21 #include <asm/sn/arch.h>
24 /* >>> Add this #define to some linux header file some day. */
25 #define BYTES_PER_WORD sizeof(void *)
28 #define DBUG_ON(condition) BUG_ON(condition)
30 #define DBUG_ON(condition)
42 #define is_shub() (is_shub1() || is_shub2())
50 * Define the maximum number of partitions the system can possibly support.
51 * It is based on the maximum number of hardware partitionable regions. The
52 * term 'region' in this context refers to the minimum number of nodes that
53 * can comprise an access protection grouping. The access protection is in
54 * regards to memory, IPI and IOI.
56 * The maximum number of hardware partitionable regions is equal to the
57 * maximum number of nodes in the entire system divided by the minimum number
58 * of nodes that comprise an access protection grouping.
60 #define XP_MAX_NPARTITIONS_SN2 64
61 #define XP_MAX_NPARTITIONS_UV 256
64 * XPC establishes channel connections between the local partition and any
65 * other partition that is currently up. Over these channels, kernel-level
66 * `users' can communicate with their counterparts on the other partitions.
68 >>> The following described limitation of a max of eight channels possible
69 >>> pertains only to ia64-sn2. THIS ISN'T TRUE SINCE I'M PLANNING TO JUST
70 >>> TIE INTO THE EXISTING MECHANISM ONCE THE CHANNEL MESSAGES ARE RECEIVED.
71 >>> THE 128-BYTE CACHELINE PERFORMANCE ISSUE IS TIED TO IA64-SN2.
73 * If the need for additional channels arises, one can simply increase
74 * XPC_MAX_NCHANNELS accordingly. If the day should come where that number
75 * exceeds the absolute MAXIMUM number of channels possible (eight), then one
76 * will need to make changes to the XPC code to accommodate for this.
78 * The absolute maximum number of channels possible is currently limited to
79 * eight for performance reasons. The internal cross partition structures
80 * require sixteen bytes per channel, and eight allows all of this
81 * interface-shared info to fit in one 128-byte cacheline.
83 #define XPC_MEM_CHANNEL 0 /* memory channel number */
84 #define XPC_NET_CHANNEL 1 /* network channel number */
86 #define XPC_MAX_NCHANNELS 2 /* max #of channels allowed */
88 #if XPC_MAX_NCHANNELS > 8
89 #error XPC_MAX_NCHANNELS exceeds absolute MAXIMUM possible.
93 * The format of an XPC message is as follows:
95 * +-------+--------------------------------+
96 * | flags |////////////////////////////////|
97 * +-------+--------------------------------+
99 * +----------------------------------------+
100 * | payload (user-defined message) |
104 * +----------------------------------------+
106 * The size of the payload is defined by the user via xpc_connect(). A user-
107 * defined message resides in the payload area.
109 * The size of a message entry (within a message queue) must be a cacheline
110 * sized multiple in order to facilitate the BTE transfer of messages from one
111 * message queue to another. A macro, XPC_MSG_SIZE(), is provided for the user
112 * that wants to fit as many msg entries as possible in a given memory size
113 * (e.g. a memory page).
116 u8 flags; /* FOR XPC INTERNAL USE ONLY */
117 u8 reserved[7]; /* FOR XPC INTERNAL USE ONLY */
118 s64 number; /* FOR XPC INTERNAL USE ONLY */
120 u64 payload; /* user defined portion of message */
123 #define XPC_MSG_PAYLOAD_OFFSET (u64) (&((struct xpc_msg *)0)->payload)
124 #define XPC_MSG_SIZE(_payload_size) \
125 L1_CACHE_ALIGN(XPC_MSG_PAYLOAD_OFFSET + (_payload_size))
128 * Define the return values and values passed to user's callout functions.
129 * (It is important to add new value codes at the end just preceding
130 * xpUnknownReason, which must have the highest numerical value.)
135 xpNotConnected, /* 1: channel is not connected */
136 xpConnected, /* 2: channel connected (opened) */
137 xpRETIRED1, /* 3: (formerly xpDisconnected) */
139 xpMsgReceived, /* 4: message received */
140 xpMsgDelivered, /* 5: message delivered and acknowledged */
142 xpRETIRED2, /* 6: (formerly xpTransferFailed) */
144 xpNoWait, /* 7: operation would require wait */
145 xpRetry, /* 8: retry operation */
146 xpTimeout, /* 9: timeout in xpc_allocate_msg_wait() */
147 xpInterrupted, /* 10: interrupted wait */
149 xpUnequalMsgSizes, /* 11: message size disparity between sides */
150 xpInvalidAddress, /* 12: invalid address */
152 xpNoMemory, /* 13: no memory available for XPC structures */
153 xpLackOfResources, /* 14: insufficient resources for operation */
154 xpUnregistered, /* 15: channel is not registered */
155 xpAlreadyRegistered, /* 16: channel is already registered */
157 xpPartitionDown, /* 17: remote partition is down */
158 xpNotLoaded, /* 18: XPC module is not loaded */
159 xpUnloading, /* 19: this side is unloading XPC module */
161 xpBadMagic, /* 20: XPC MAGIC string not found */
163 xpReactivating, /* 21: remote partition was reactivated */
165 xpUnregistering, /* 22: this side is unregistering channel */
166 xpOtherUnregistering, /* 23: other side is unregistering channel */
168 xpCloneKThread, /* 24: cloning kernel thread */
169 xpCloneKThreadFailed, /* 25: cloning kernel thread failed */
171 xpNoHeartbeat, /* 26: remote partition has no heartbeat */
173 xpPioReadError, /* 27: PIO read error */
174 xpPhysAddrRegFailed, /* 28: registration of phys addr range failed */
176 xpRETIRED3, /* 29: (formerly xpBteDirectoryError) */
177 xpRETIRED4, /* 30: (formerly xpBtePoisonError) */
178 xpRETIRED5, /* 31: (formerly xpBteWriteError) */
179 xpRETIRED6, /* 32: (formerly xpBteAccessError) */
180 xpRETIRED7, /* 33: (formerly xpBtePWriteError) */
181 xpRETIRED8, /* 34: (formerly xpBtePReadError) */
182 xpRETIRED9, /* 35: (formerly xpBteTimeOutError) */
183 xpRETIRED10, /* 36: (formerly xpBteXtalkError) */
184 xpRETIRED11, /* 37: (formerly xpBteNotAvailable) */
185 xpRETIRED12, /* 38: (formerly xpBteUnmappedError) */
187 xpBadVersion, /* 39: bad version number */
188 xpVarsNotSet, /* 40: the XPC variables are not set up */
189 xpNoRsvdPageAddr, /* 41: unable to get rsvd page's phys addr */
190 xpInvalidPartid, /* 42: invalid partition ID */
191 xpLocalPartid, /* 43: local partition ID */
193 xpOtherGoingDown, /* 44: other side going down, reason unknown */
194 xpSystemGoingDown, /* 45: system is going down, reason unknown */
195 xpSystemHalt, /* 46: system is being halted */
196 xpSystemReboot, /* 47: system is being rebooted */
197 xpSystemPoweroff, /* 48: system is being powered off */
199 xpDisconnecting, /* 49: channel disconnecting (closing) */
201 xpOpenCloseError, /* 50: channel open/close protocol error */
203 xpDisconnected, /* 51: channel disconnected (closed) */
205 xpBteCopyError, /* 52: bte_copy() returned error */
206 xpSalError, /* 53: sn SAL error */
207 xpRsvdPageNotSet, /* 54: the reserved page is not set up */
208 xpPayloadTooBig, /* 55: payload too large for message slot */
210 xpUnsupported, /* 56: unsupported functionality or resource */
211 xpUnknownReason /* 57: unknown reason - must be last in enum */
215 * Define the callout function type used by XPC to update the user on
216 * connection activity and state changes via the user function registered
221 * reason - reason code.
222 * partid - partition ID associated with condition.
223 * ch_number - channel # associated with condition.
224 * data - pointer to optional data.
225 * key - pointer to optional user-defined value provided as the "key"
226 * argument to xpc_connect().
228 * A reason code of xpConnected indicates that a connection has been
229 * established to the specified partition on the specified channel. The data
230 * argument indicates the max number of entries allowed in the message queue.
232 * A reason code of xpMsgReceived indicates that a XPC message arrived from
233 * the specified partition on the specified channel. The data argument
234 * specifies the address of the message's payload. The user must call
235 * xpc_received() when finished with the payload.
237 * All other reason codes indicate failure. The data argmument is NULL.
238 * When a failure reason code is received, one can assume that the channel
241 typedef void (*xpc_channel_func) (enum xp_retval reason, short partid,
242 int ch_number, void *data, void *key);
245 * Define the callout function type used by XPC to notify the user of
246 * messages received and delivered via the user function registered by
251 * reason - reason code.
252 * partid - partition ID associated with condition.
253 * ch_number - channel # associated with condition.
254 * key - pointer to optional user-defined value provided as the "key"
255 * argument to xpc_send_notify().
257 * A reason code of xpMsgDelivered indicates that the message was delivered
258 * to the intended recipient and that they have acknowledged its receipt by
259 * calling xpc_received().
261 * All other reason codes indicate failure.
263 typedef void (*xpc_notify_func) (enum xp_retval reason, short partid,
264 int ch_number, void *key);
267 * The following is a registration entry. There is a global array of these,
268 * one per channel. It is used to record the connection registration made
269 * by the users of XPC. As long as a registration entry exists, for any
270 * partition that comes up, XPC will attempt to establish a connection on
271 * that channel. Notification that a connection has been made will occur via
272 * the xpc_channel_func function.
274 * The 'func' field points to the function to call when aynchronous
275 * notification is required for such events as: a connection established/lost,
276 * or an incoming message received, or an error condition encountered. A
277 * non-NULL 'func' field indicates that there is an active registration for
280 struct xpc_registration {
282 xpc_channel_func func; /* function to call */
283 void *key; /* pointer to user's key */
284 u16 nentries; /* #of msg entries in local msg queue */
285 u16 msg_size; /* message queue's message size */
286 u32 assigned_limit; /* limit on #of assigned kthreads */
287 u32 idle_limit; /* limit on #of idle kthreads */
288 } ____cacheline_aligned;
290 #define XPC_CHANNEL_REGISTERED(_c) (xpc_registrations[_c].func != NULL)
292 /* the following are valid xpc_send() or xpc_send_notify() flags */
293 #define XPC_WAIT 0 /* wait flag */
294 #define XPC_NOWAIT 1 /* no wait flag */
296 struct xpc_interface {
297 void (*connect) (int);
298 void (*disconnect) (int);
299 enum xp_retval (*send) (short, int, u32, void *, u16);
300 enum xp_retval (*send_notify) (short, int, u32, void *, u16,
301 xpc_notify_func, void *);
302 void (*received) (short, int, void *);
303 enum xp_retval (*partid_to_nasids) (short, void *);
306 extern struct xpc_interface xpc_interface;
308 extern void xpc_set_interface(void (*)(int),
310 enum xp_retval (*)(short, int, u32, void *, u16),
311 enum xp_retval (*)(short, int, u32, void *, u16,
312 xpc_notify_func, void *),
313 void (*)(short, int, void *),
314 enum xp_retval (*)(short, void *));
315 extern void xpc_clear_interface(void);
317 extern enum xp_retval xpc_connect(int, xpc_channel_func, void *, u16,
319 extern void xpc_disconnect(int);
321 static inline enum xp_retval
322 xpc_send(short partid, int ch_number, u32 flags, void *payload,
325 return xpc_interface.send(partid, ch_number, flags, payload,
329 static inline enum xp_retval
330 xpc_send_notify(short partid, int ch_number, u32 flags, void *payload,
331 u16 payload_size, xpc_notify_func func, void *key)
333 return xpc_interface.send_notify(partid, ch_number, flags, payload,
334 payload_size, func, key);
338 xpc_received(short partid, int ch_number, void *payload)
340 return xpc_interface.received(partid, ch_number, payload);
343 static inline enum xp_retval
344 xpc_partid_to_nasids(short partid, void *nasids)
346 return xpc_interface.partid_to_nasids(partid, nasids);
349 extern short xp_max_npartitions;
351 extern enum xp_retval (*xp_remote_memcpy) (void *, const void *, size_t);
353 extern u64 xp_nofault_PIOR_target;
354 extern int xp_nofault_PIOR(void *);
355 extern int xp_error_PIOR(void);
357 extern struct device *xp;
358 extern enum xp_retval xp_init_sn2(void);
359 extern enum xp_retval xp_init_uv(void);
360 extern void xp_exit_sn2(void);
361 extern void xp_exit_uv(void);
363 #endif /* _DRIVERS_MISC_SGIXP_XP_H */