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>
20 #include <asm/sn/bte.h>
22 #include <asm/sn/arch.h>
25 /* >>> Add this #define to some linux header file some day. */
26 #define BYTES_PER_WORD sizeof(void *)
29 #define DBUG_ON(condition) BUG_ON(condition)
31 #define DBUG_ON(condition)
43 #define is_shub() (is_shub1() || is_shub2())
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.
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.
61 #define XP_MAX_NPARTITIONS_SN2 64
62 #define XP_MAX_NPARTITIONS_UV 256
65 * Define the number of u64s required to represent all the C-brick nasids
66 * as a bitmap. The cross-partition kernel modules deal only with
67 * C-brick nasids, thus the need for bitmaps which don't account for
68 * odd-numbered (non C-brick) nasids.
70 #define XP_MAX_PHYSNODE_ID (MAX_NUMALINK_NODES / 2)
71 #define XP_NASID_MASK_BYTES ((XP_MAX_PHYSNODE_ID + 7) / 8)
72 #define XP_NASID_MASK_WORDS ((XP_MAX_PHYSNODE_ID + 63) / 64)
75 * Wrapper for bte_copy() that should it return a failure status will retry
76 * the bte_copy() once in the hope that the failure was due to a temporary
77 * aberration (i.e., the link going down temporarily).
79 * src - physical address of the source of the transfer.
80 * vdst - virtual address of the destination of the transfer.
81 * len - number of bytes to transfer from source to destination.
82 * mode - see bte_copy() for definition.
83 * notification - see bte_copy() for definition.
85 * Note: xp_bte_copy() should never be called while holding a spinlock.
87 static inline bte_result_t
88 xp_bte_copy(u64 src, u64 vdst, u64 len, u64 mode, void *notification)
91 u64 pdst = ia64_tpa(vdst);
94 * Ensure that the physically mapped memory is contiguous.
96 * We do this by ensuring that the memory is from region 7 only.
97 * If the need should arise to use memory from one of the other
98 * regions, then modify the BUG_ON() statement to ensure that the
99 * memory from that region is always physically contiguous.
101 BUG_ON(REGION_NUMBER(vdst) != RGN_KERNEL);
103 ret = bte_copy(src, pdst, len, mode, notification);
104 if ((ret != BTE_SUCCESS) && BTE_ERROR_RETRY(ret)) {
108 ret = bte_copy(src, pdst, len, mode, notification);
115 * XPC establishes channel connections between the local partition and any
116 * other partition that is currently up. Over these channels, kernel-level
117 * `users' can communicate with their counterparts on the other partitions.
119 >>> The following described limitation of a max of eight channels possible
120 >>> pertains only to ia64-sn2. THIS ISN'T TRUE SINCE I'M PLANNING TO JUST
121 >>> TIE INTO THE EXISTING MECHANISM ONCE THE CHANNEL MESSAGES ARE RECEIVED.
122 >>> THE 128-BYTE CACHELINE PERFORMANCE ISSUE IS TIED TO IA64-SN2.
124 * If the need for additional channels arises, one can simply increase
125 * XPC_MAX_NCHANNELS accordingly. If the day should come where that number
126 * exceeds the absolute MAXIMUM number of channels possible (eight), then one
127 * will need to make changes to the XPC code to accommodate for this.
129 * The absolute maximum number of channels possible is currently limited to
130 * eight for performance reasons. The internal cross partition structures
131 * require sixteen bytes per channel, and eight allows all of this
132 * interface-shared info to fit in one 128-byte cacheline.
134 #define XPC_MEM_CHANNEL 0 /* memory channel number */
135 #define XPC_NET_CHANNEL 1 /* network channel number */
137 #define XPC_MAX_NCHANNELS 2 /* max #of channels allowed */
139 #if XPC_MAX_NCHANNELS > 8
140 #error XPC_MAX_NCHANNELS exceeds absolute MAXIMUM possible.
144 * The format of an XPC message is as follows:
146 * +-------+--------------------------------+
147 * | flags |////////////////////////////////|
148 * +-------+--------------------------------+
150 * +----------------------------------------+
151 * | payload (user-defined message) |
155 * +----------------------------------------+
157 * The size of the payload is defined by the user via xpc_connect(). A user-
158 * defined message resides in the payload area.
160 * The user should have no dealings with the message header, but only the
161 * message's payload. When a message entry is allocated (via xpc_allocate())
162 * a pointer to the payload area is returned and not the actual beginning of
163 * the XPC message. The user then constructs a message in the payload area
164 * and passes that pointer as an argument on xpc_send() or xpc_send_notify().
166 * The size of a message entry (within a message queue) must be a cacheline
167 * sized multiple in order to facilitate the BTE transfer of messages from one
168 * message queue to another. A macro, XPC_MSG_SIZE(), is provided for the user
169 * that wants to fit as many msg entries as possible in a given memory size
170 * (e.g. a memory page).
173 u8 flags; /* FOR XPC INTERNAL USE ONLY */
174 u8 reserved[7]; /* FOR XPC INTERNAL USE ONLY */
175 s64 number; /* FOR XPC INTERNAL USE ONLY */
177 u64 payload; /* user defined portion of message */
180 #define XPC_MSG_PAYLOAD_OFFSET (u64) (&((struct xpc_msg *)0)->payload)
181 #define XPC_MSG_SIZE(_payload_size) \
182 L1_CACHE_ALIGN(XPC_MSG_PAYLOAD_OFFSET + (_payload_size))
185 * Define the return values and values passed to user's callout functions.
186 * (It is important to add new value codes at the end just preceding
187 * xpUnknownReason, which must have the highest numerical value.)
192 xpNotConnected, /* 1: channel is not connected */
193 xpConnected, /* 2: channel connected (opened) */
194 xpRETIRED1, /* 3: (formerly xpDisconnected) */
196 xpMsgReceived, /* 4: message received */
197 xpMsgDelivered, /* 5: message delivered and acknowledged */
199 xpRETIRED2, /* 6: (formerly xpTransferFailed) */
201 xpNoWait, /* 7: operation would require wait */
202 xpRetry, /* 8: retry operation */
203 xpTimeout, /* 9: timeout in xpc_allocate_msg_wait() */
204 xpInterrupted, /* 10: interrupted wait */
206 xpUnequalMsgSizes, /* 11: message size disparity between sides */
207 xpInvalidAddress, /* 12: invalid address */
209 xpNoMemory, /* 13: no memory available for XPC structures */
210 xpLackOfResources, /* 14: insufficient resources for operation */
211 xpUnregistered, /* 15: channel is not registered */
212 xpAlreadyRegistered, /* 16: channel is already registered */
214 xpPartitionDown, /* 17: remote partition is down */
215 xpNotLoaded, /* 18: XPC module is not loaded */
216 xpUnloading, /* 19: this side is unloading XPC module */
218 xpBadMagic, /* 20: XPC MAGIC string not found */
220 xpReactivating, /* 21: remote partition was reactivated */
222 xpUnregistering, /* 22: this side is unregistering channel */
223 xpOtherUnregistering, /* 23: other side is unregistering channel */
225 xpCloneKThread, /* 24: cloning kernel thread */
226 xpCloneKThreadFailed, /* 25: cloning kernel thread failed */
228 xpNoHeartbeat, /* 26: remote partition has no heartbeat */
230 xpPioReadError, /* 27: PIO read error */
231 xpPhysAddrRegFailed, /* 28: registration of phys addr range failed */
233 xpRETIRED3, /* 29: (formerly xpBteDirectoryError) */
234 xpRETIRED4, /* 30: (formerly xpBtePoisonError) */
235 xpRETIRED5, /* 31: (formerly xpBteWriteError) */
236 xpRETIRED6, /* 32: (formerly xpBteAccessError) */
237 xpRETIRED7, /* 33: (formerly xpBtePWriteError) */
238 xpRETIRED8, /* 34: (formerly xpBtePReadError) */
239 xpRETIRED9, /* 35: (formerly xpBteTimeOutError) */
240 xpRETIRED10, /* 36: (formerly xpBteXtalkError) */
241 xpRETIRED11, /* 37: (formerly xpBteNotAvailable) */
242 xpRETIRED12, /* 38: (formerly xpBteUnmappedError) */
244 xpBadVersion, /* 39: bad version number */
245 xpVarsNotSet, /* 40: the XPC variables are not set up */
246 xpNoRsvdPageAddr, /* 41: unable to get rsvd page's phys addr */
247 xpInvalidPartid, /* 42: invalid partition ID */
248 xpLocalPartid, /* 43: local partition ID */
250 xpOtherGoingDown, /* 44: other side going down, reason unknown */
251 xpSystemGoingDown, /* 45: system is going down, reason unknown */
252 xpSystemHalt, /* 46: system is being halted */
253 xpSystemReboot, /* 47: system is being rebooted */
254 xpSystemPoweroff, /* 48: system is being powered off */
256 xpDisconnecting, /* 49: channel disconnecting (closing) */
258 xpOpenCloseError, /* 50: channel open/close protocol error */
260 xpDisconnected, /* 51: channel disconnected (closed) */
262 xpBteCopyError, /* 52: bte_copy() returned error */
263 xpSalError, /* 53: sn SAL error */
265 xpUnsupported, /* 54: unsupported functionality or resource */
266 xpUnknownReason /* 55: unknown reason - must be last in enum */
270 * Define the callout function type used by XPC to update the user on
271 * connection activity and state changes via the user function registered
276 * reason - reason code.
277 * partid - partition ID associated with condition.
278 * ch_number - channel # associated with condition.
279 * data - pointer to optional data.
280 * key - pointer to optional user-defined value provided as the "key"
281 * argument to xpc_connect().
283 * A reason code of xpConnected indicates that a connection has been
284 * established to the specified partition on the specified channel. The data
285 * argument indicates the max number of entries allowed in the message queue.
287 * A reason code of xpMsgReceived indicates that a XPC message arrived from
288 * the specified partition on the specified channel. The data argument
289 * specifies the address of the message's payload. The user must call
290 * xpc_received() when finished with the payload.
292 * All other reason codes indicate failure. The data argmument is NULL.
293 * When a failure reason code is received, one can assume that the channel
296 typedef void (*xpc_channel_func) (enum xp_retval reason, short partid,
297 int ch_number, void *data, void *key);
300 * Define the callout function type used by XPC to notify the user of
301 * messages received and delivered via the user function registered by
306 * reason - reason code.
307 * partid - partition ID associated with condition.
308 * ch_number - channel # associated with condition.
309 * key - pointer to optional user-defined value provided as the "key"
310 * argument to xpc_send_notify().
312 * A reason code of xpMsgDelivered indicates that the message was delivered
313 * to the intended recipient and that they have acknowledged its receipt by
314 * calling xpc_received().
316 * All other reason codes indicate failure.
318 typedef void (*xpc_notify_func) (enum xp_retval reason, short partid,
319 int ch_number, void *key);
322 * The following is a registration entry. There is a global array of these,
323 * one per channel. It is used to record the connection registration made
324 * by the users of XPC. As long as a registration entry exists, for any
325 * partition that comes up, XPC will attempt to establish a connection on
326 * that channel. Notification that a connection has been made will occur via
327 * the xpc_channel_func function.
329 * The 'func' field points to the function to call when aynchronous
330 * notification is required for such events as: a connection established/lost,
331 * or an incoming message received, or an error condition encountered. A
332 * non-NULL 'func' field indicates that there is an active registration for
335 struct xpc_registration {
337 xpc_channel_func func; /* function to call */
338 void *key; /* pointer to user's key */
339 u16 nentries; /* #of msg entries in local msg queue */
340 u16 msg_size; /* message queue's message size */
341 u32 assigned_limit; /* limit on #of assigned kthreads */
342 u32 idle_limit; /* limit on #of idle kthreads */
343 } ____cacheline_aligned;
345 #define XPC_CHANNEL_REGISTERED(_c) (xpc_registrations[_c].func != NULL)
347 /* the following are valid xpc_allocate() flags */
348 #define XPC_WAIT 0 /* wait flag */
349 #define XPC_NOWAIT 1 /* no wait flag */
351 struct xpc_interface {
352 void (*connect) (int);
353 void (*disconnect) (int);
354 enum xp_retval (*allocate) (short, int, u32, void **);
355 enum xp_retval (*send) (short, int, void *);
356 enum xp_retval (*send_notify) (short, int, void *,
357 xpc_notify_func, void *);
358 void (*received) (short, int, void *);
359 enum xp_retval (*partid_to_nasids) (short, void *);
362 extern struct xpc_interface xpc_interface;
364 extern void xpc_set_interface(void (*)(int),
366 enum xp_retval (*)(short, int, u32, void **),
367 enum xp_retval (*)(short, int, void *),
368 enum xp_retval (*)(short, int, void *,
369 xpc_notify_func, void *),
370 void (*)(short, int, void *),
371 enum xp_retval (*)(short, void *));
372 extern void xpc_clear_interface(void);
374 extern enum xp_retval xpc_connect(int, xpc_channel_func, void *, u16,
376 extern void xpc_disconnect(int);
378 static inline enum xp_retval
379 xpc_allocate(short partid, int ch_number, u32 flags, void **payload)
381 return xpc_interface.allocate(partid, ch_number, flags, payload);
384 static inline enum xp_retval
385 xpc_send(short partid, int ch_number, void *payload)
387 return xpc_interface.send(partid, ch_number, payload);
390 static inline enum xp_retval
391 xpc_send_notify(short partid, int ch_number, void *payload,
392 xpc_notify_func func, void *key)
394 return xpc_interface.send_notify(partid, ch_number, payload, func, key);
398 xpc_received(short partid, int ch_number, void *payload)
400 return xpc_interface.received(partid, ch_number, payload);
403 static inline enum xp_retval
404 xpc_partid_to_nasids(short partid, void *nasids)
406 return xpc_interface.partid_to_nasids(partid, nasids);
409 extern short xp_max_npartitions;
411 extern u64 xp_nofault_PIOR_target;
412 extern int xp_nofault_PIOR(void *);
413 extern int xp_error_PIOR(void);
415 extern struct device *xp;
416 extern enum xp_retval xp_init_sn2(void);
417 extern enum xp_retval xp_init_uv(void);
418 extern void xp_exit_sn2(void);
419 extern void xp_exit_uv(void);
421 #endif /* _DRIVERS_MISC_SGIXP_XP_H */