/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2004-2005 Silicon Graphics, Inc. All rights reserved.
*/
/*
* External Cross Partition (XP) structures and defines.
*/
#ifndef _ASM_IA64_SN_XP_H
#define _ASM_IA64_SN_XP_H
#include <linux/cache.h>
#include <linux/hardirq.h>
#include <asm/sn/types.h>
#include <asm/sn/bte.h>
#ifdef USE_DBUG_ON
#define DBUG_ON(condition) BUG_ON(condition)
#else
#define DBUG_ON(condition)
#endif
/*
* Define the maximum number of logically defined partitions the system
* can support. It is constrained by the maximum number of hardware
* partitionable regions. The term 'region' in this context refers to the
* minimum number of nodes that can comprise an access protection grouping.
* The access protection is in regards to memory, IPI and IOI.
*
* The maximum number of hardware partitionable regions is equal to the
* maximum number of nodes in the entire system divided by the minimum number
* of nodes that comprise an access protection grouping.
*/
#define XP_MAX_PARTITIONS 64
/*
* Define the number of u64s required to represent all the C-brick nasids
* as a bitmap. The cross-partition kernel modules deal only with
* C-brick nasids, thus the need for bitmaps which don't account for
* odd-numbered (non C-brick) nasids.
*/
#define XP_MAX_PHYSNODE_ID (MAX_PHYSNODE_ID / 2)
#define XP_NASID_MASK_BYTES ((XP_MAX_PHYSNODE_ID + 7) / 8)
#define XP_NASID_MASK_WORDS ((XP_MAX_PHYSNODE_ID + 63) / 64)
/*
* Wrapper for bte_copy() that should it return a failure status will retry
* the bte_copy() once in the hope that the failure was due to a temporary
* aberration (i.e., the link going down temporarily).
*
* See bte_copy for definition of the input parameters.
*
* Note: xp_bte_copy() should never be called while holding a spinlock.
*/
static inline bte_result_t
xp_bte_copy(u64 src, u64 dest, u64 len, u64 mode, void *notification)
{
bte_result_t ret;
ret = bte_copy(src, dest, len, mode, notification);
if (ret != BTE_SUCCESS) {
if (!in_interrupt()) {
cond_resched();
}
ret = bte_copy(src, dest, len, mode, notification);
}
return ret;
}
/*
* XPC establishes channel connections between the local partition and any
* other partition that is currently up. Over these channels, kernel-level
* `users' can communicate with their counterparts on the other partitions.
*
* The maxinum number of channels is limited to eight. For performance reasons,
* the internal cross partition structures require sixteen bytes per channel,
* and eight allows all of this interface-shared info to fit in one cache line.
*
* XPC_NCHANNELS reflects the total number of channels currently defined.
* If the need for additional channels arises, one can simply increase
* XPC_NCHANNELS accordingly. If the day should come where that number
* exceeds the MAXIMUM number of channels allowed (eight), then one will need
* to make changes to the XPC code to allow for this.
*/
#define XPC_MEM_CHANNEL 0 /* memory channel number */
#define XPC_NET_CHANNEL 1 /* network channel number */
#define XPC_NCHANNELS 2 /* #of defined channels */
#define XPC_MAX_NCHANNELS 8 /* max #of channels allowed */
#if XPC_NCHANNELS > XPC_MAX_NCHANNELS
#error XPC_NCHANNELS exceeds MAXIMUM allowed.
#endif
/*
* The format of an XPC message is as follows:
*
* +-------+--------------------------------+
* | flags |////////////////////////////////|
* +-------+--------------------------------+
* | message # |
* +----------------------------------------+
* | payload (user-defined message) |
* | |
* :
* | |
* +----------------------------------------+
*
* The size of the payload is defined by the user via xpc_connect(). A user-
* defined message resides in the payload area.
*
* The user should have no dealings with the message header, but only the
* message's payload. When a message entry is allocated (via xpc_allocate())
* a pointer to the payload area is returned and not the actual beginning of
* the XPC message. The user then constructs a message in the payload area
* and passes that pointer as an argument on xpc_send() or xpc_send_notify().
*
* The size of a message entry (within a message queue) must be a cacheline
* sized multiple in order to facilitate the BTE transfer of messages from one
* message queue to another. A macro, XPC_MSG_SIZE(), is provided for the user
* that wants to fit as many msg entries as possible in a given memory size
* (e.g. a memory page).
*/
struct xpc_msg {
u8 flags; /* FOR XPC INTERNAL USE ONLY */
u8 reserved[7]; /* FOR XPC INTERNAL USE ONLY */
s64 number; /* FOR XPC INTERNAL USE ONLY */
u64 payload; /* user defined portion of message */
};
#define XPC_MSG_PAYLOAD_OFFSET (u64) (&((struct xpc_msg *)0)->payload)
#define XPC_MSG_SIZE(_payload_size) \
L1_CACHE_ALIGN(XPC_MSG_PAYLOAD_OFFSET + (_payload_size))
/*
* Define the return values and values passed to user's callout functions.
* (It is important to add new value codes at the end just preceding
* xpcUnknownReason, which must have the highest numerical value.)
*/
enum xpc_retval {
xpcSuccess = 0,
xpcNotConnected, /* 1: channel is not connected */
xpcConnected, /* 2: channel connected (opened) */
xpcRETIRED1, /* 3: (formerly xpcDisconnected) */
xpcMsgReceived, /* 4: message received */
xpcMsgDelivered, /* 5: message delivered and acknowledged */
xpcRETIRED2, /* 6: (formerly xpcTransferFailed) */
xpcNoWait, /* 7: operation would require wait */
xpcRetry, /* 8: retry operation */
xpcTimeout, /* 9: timeout in xpc_allocate_msg_wait() */
xpcInterrupted, /* 10: interrupted wait */
xpcUnequalMsgSizes, /* 11: message size disparity between sides */
xpcInvalidAddress, /* 12: invalid address */
xpcNoMemory, /* 13: no memory available for XPC structures */
xpcLackOfResources, /* 14: insufficient resources for operation */
xpcUnregistered, /* 15: channel is not registered */
xpcAlreadyRegistered, /* 16: channel is already registered */
xpcPartitionDown, /* 17: remote partition is down */
xpcNotLoaded, /* 18: XPC module is not loaded */
xpcUnloading, /* 19: this side is unloading XPC module */
xpcBadMagic, /* 20: XPC MAGIC string not found */
xpcReactivating, /* 21: remote partition was reactivated */
xpcUnregistering, /* 22: this side is unregistering channel */
xpcOtherUnregistering, /* 23: other side is unregistering channel */
xpcCloneKThread, /* 24: cloning kernel thread */
xpcCloneKThreadFailed, /* 25: cloning kernel thread failed */
xpcNoHeartbeat, /* 26: remote partition has no heartbeat */
xpcPioReadError, /* 27: PIO read error */
xpcPhysAddrRegFailed, /* 28: registration of phys addr range failed */
xpcBteDirectoryError, /* 29: maps to BTEFAIL_DIR */
xpcBtePoisonError, /* 30: maps to BTEFAIL_POISON */
xpcBteWriteError, /* 31: maps to BTEFAIL_WERR */
xpcBteAccessError, /* 32: maps to BTEFAIL_ACCESS */
xpcBtePWriteError, /* 33: maps to BTEFAIL_PWERR */
xpcBtePReadError, /* 34: maps to BTEFAIL_PRERR */
xpcBteTimeOutError, /* 35: maps to BTEFAIL_TOUT */
xpcBteXtalkError, /* 36: maps to BTEFAIL_XTERR */
xpcBteNotAvailable, /* 37: maps to BTEFAIL_NOTAVAIL */
xpcBteUnmappedError, /* 38: unmapped BTEFAIL_ error */
xpcBadVersion, /* 39: bad version number */
xpcVarsNotSet, /* 40: the XPC variables are not set up */
xpcNoRsvdPageAddr, /* 41: unable to get rsvd page's phys addr */
xpcInvalidPartid, /* 42: invalid partition ID */
xpcLocalPartid, /* 43: local partition ID */
xpcUnknownReason /* 44: unknown reason -- must be last in list */
};
/*
* Define the callout function types used by XPC to update the user on
* connection activity and state changes (via the user function registered by
* xpc_connect()) and to notify them of messages received and delivered (via
* the user function registered by xpc_send_notify()).
*
* The two function types are xpc_channel_func and xpc_notify_func and
* both share the following arguments, with the exception of "data", which
* only xpc_channel_func has.
*
* Arguments:
*
* reason - reason code. (See following table.)
* partid - partition ID associated with condition.
* ch_number - channel # associated with condition.
* data - pointer to optional data. (See following table.)
* key - pointer to optional user-defined value provided as the "key"
* argument to xpc_connect() or xpc_send_notify().
*
* In the following table the "Optional Data" column applies to callouts made
* to functions registered by xpc_connect(). A "NA" in that column indicates
* that this reason code can be passed to functions registered by
* xpc_send_notify() (i.e. they don't have data arguments).
*
* Also, the first three reason codes in the following table indicate
* success, whereas the others indicate failure. When a failure reason code
* is received, one can assume that the channel is not connected.
*
*
* Reason Code | Cause | Optional Data
* =====================+================================+=====================
* xpcConnected | connection has been established| max #of entries
* | to the specified partition on | allowed in message
* | the specified channel | queue
* ---------------------+--------------------------------+---------------------
* xpcMsgReceived | an XPC message arrived from | address of payload
* | the specified partition on the |
* | specified channel | [the user must call
* | | xpc_received() when
* | | finished with the
* | | payload]
* ---------------------+--------------------------------+---------------------
* xpcMsgDelivered | notification that the message | NA
* | was delivered to the intended |
* | recipient and that they have |
* | acknowledged its receipt by |
* | calling xpc_received() |
* =====================+================================+=====================
* xpcUnequalMsgSizes | can't connect to the specified | NULL
* | partition on the specified |
* | channel because of mismatched |
* | message sizes |
* ---------------------+--------------------------------+---------------------
* xpcNoMemory | insufficient memory avaiable | NULL
* | to allocate message queue |
* ---------------------+--------------------------------+---------------------
* xpcLackOfResources | lack of resources to create | NULL
* | the necessary kthreads to |
* | support the channel |
* ---------------------+--------------------------------+---------------------
* xpcUnregistering | this side's user has | NULL or NA
* | unregistered by calling |
* | xpc_disconnect() |
* ---------------------+--------------------------------+---------------------
* xpcOtherUnregistering| the other side's user has | NULL or NA
* | unregistered by calling |
* | xpc_disconnect() |
* ---------------------+--------------------------------+---------------------
* xpcNoHeartbeat | the other side's XPC is no | NULL or NA
* | longer heartbeating |
* | |
* ---------------------+--------------------------------+---------------------
* xpcUnloading | this side's XPC module is | NULL or NA
* | being unloaded |
* | |
* ---------------------+--------------------------------+---------------------
* xpcOtherUnloading | the other side's XPC module is | NULL or NA
* | is being unloaded |
* | |
* ---------------------+--------------------------------+---------------------
* xpcPioReadError | xp_nofault_PIOR() returned an | NULL or NA
* | error while sending an IPI |
* | |
* ---------------------+--------------------------------+---------------------
* xpcInvalidAddress | the address either received or | NULL or NA
* | sent by the specified partition|
* | is invalid |
* ---------------------+--------------------------------+---------------------
* xpcBteNotAvailable | attempt to pull data from the | NULL or NA
* xpcBtePoisonError | specified partition over the |
* xpcBteWriteError | specified channel via a |
* xpcBteAccessError | bte_copy() failed |
* xpcBteTimeOutError | |
* xpcBteXtalkError | |
* xpcBteDirectoryError | |
* xpcBteGenericError | |
* xpcBteUnmappedError | |
* ---------------------+--------------------------------+---------------------
* xpcUnknownReason | the specified channel to the | NULL or NA
* | specified partition was |
* | unavailable for unknown reasons|
* =====================+================================+=====================
*/
typedef void (*xpc_channel_func)(enum xpc_retval reason, partid_t partid,
int ch_number, void *data, void *key);
typedef void (*xpc_notify_func)(enum xpc_retval reason, partid_t partid,
int ch_number, void *key);
/*
* The following is a registration entry. There is a global array of these,
* one per channel. It is used to record the connection registration made
* by the users of XPC. As long as a registration entry exists, for any
* partition that comes up, XPC will attempt to establish a connection on
* that channel. Notification that a connection has been made will occur via
* the xpc_channel_func function.
*
* The 'func' field points to the function to call when aynchronous
* notification is required for such events as: a connection established/lost,
* or an incomming message received, or an error condition encountered. A
* non-NULL 'func' field indicates that there is an active registration for
* the channel.
*/
struct xpc_registration {
struct semaphore sema;
xpc_channel_func func; /* function to call */
void *key; /* pointer to user's key */
u16 nentries; /* #of msg entries in local msg queue */
u16 msg_size; /* message queue's message size */
u32 assigned_limit; /* limit on #of assigned kthreads */
u32 idle_limit; /* limit on #of idle kthreads */
} ____cacheline_aligned;
#define XPC_CHANNEL_REGISTERED(_c) (xpc_registrations[_c].func != NULL)
/* the following are valid xpc_allocate() flags */
#define XPC_WAIT 0 /* wait flag */
#define XPC_NOWAIT 1 /* no wait flag */
struct xpc_interface {
void (*connect)(int);
void (*disconnect)(int);
enum xpc_retval (*allocate)(partid_t, int, u32, void **);
enum xpc_retval (*send)(partid_t, int, void *);
enum xpc_retval (*send_notify)(partid_t, int, void *,
xpc_notify_func, void *);
void (*received)(partid_t, int, void *);
enum xpc_retval (*partid_to_nasids)(partid_t, void *);
};
extern struct xpc_interface xpc_interface;
extern void xpc_set_interface(void (*)(int),
void (*)(int),
enum xpc_retval (*)(partid_t, int, u32, void **),
enum xpc_retval (*)(partid_t, int, void *),
enum xpc_retval (*)(partid_t, int, void *, xpc_notify_func,
void *),
void (*)(partid_t, int, void *),
enum xpc_retval (*)(partid_t, void *));
extern void xpc_clear_interface(void);
extern enum xpc_retval xpc_connect(int, xpc_channel_func, void *, u16,
u16, u32, u32);
extern void xpc_disconnect(int);
static inline enum xpc_retval
xpc_allocate(partid_t partid, int ch_number, u32 flags, void **payload)
{
return xpc_interface.allocate(partid, ch_number, flags, payload);
}
static inline enum xpc_retval
xpc_send(partid_t partid, int ch_number, void *payload)
{
return xpc_interface.send(partid, ch_number, payload);
}
static inline enum xpc_retval
xpc_send_notify(partid_t partid, int ch_number, void *payload,
xpc_notify_func func, void *key)
{
return xpc_interface.send_notify(partid, ch_number, payload, func, key);
}
static inline void
xpc_received(partid_t partid, int ch_number, void *payload)
{
return xpc_interface.received(partid, ch_number, payload);
}
static inline enum xpc_retval
xpc_partid_to_nasids(partid_t partid, void *nasids)
{
return xpc_interface.partid_to_nasids(partid, nasids);
}
extern u64 xp_nofault_PIOR_target;
extern int xp_nofault_PIOR(void *);
extern int xp_error_PIOR(void);
#endif /* _ASM_IA64_SN_XP_H */
