diff options
| -rw-r--r-- | arch/ia64/Kconfig | 10 | ||||
| -rw-r--r-- | arch/ia64/sn/kernel/xp_main.c | 289 | ||||
| -rw-r--r-- | arch/ia64/sn/kernel/xp_nofault.S | 31 | ||||
| -rw-r--r-- | include/asm-ia64/sn/xp.h | 436 |
4 files changed, 766 insertions, 0 deletions
diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig index cad8346def1d..ce13ad689d19 100644 --- a/arch/ia64/Kconfig +++ b/arch/ia64/Kconfig @@ -217,6 +217,16 @@ config IA64_SGI_SN_SIM If you are compiling a kernel that will run under SGI's IA-64 simulator (Medusa) then say Y, otherwise say N. +config IA64_SGI_SN_XP + tristate "Support communication between SGI SSIs" + depends on MSPEC + help + An SGI machine can be divided into multiple Single System + Images which act independently of each other and have + hardware based memory protection from the others. Enabling + this feature will allow for direct communication between SSIs + based on a network adapter and DMA messaging. + config FORCE_MAX_ZONEORDER int default "18" diff --git a/arch/ia64/sn/kernel/xp_main.c b/arch/ia64/sn/kernel/xp_main.c new file mode 100644 index 000000000000..3be52a34c80f --- /dev/null +++ b/arch/ia64/sn/kernel/xp_main.c @@ -0,0 +1,289 @@ +/* + * 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. + */ + + +/* + * Cross Partition (XP) base. + * + * XP provides a base from which its users can interact + * with XPC, yet not be dependent on XPC. + * + */ + + +#include <linux/kernel.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <asm/sn/intr.h> +#include <asm/sn/sn_sal.h> +#include <asm/sn/xp.h> + + +/* + * Target of nofault PIO read. + */ +u64 xp_nofault_PIOR_target; + + +/* + * xpc_registrations[] keeps track of xpc_connect()'s done by the kernel-level + * users of XPC. + */ +struct xpc_registration xpc_registrations[XPC_NCHANNELS]; + + +/* + * Initialize the XPC interface to indicate that XPC isn't loaded. + */ +static enum xpc_retval xpc_notloaded(void) { return xpcNotLoaded; } + +struct xpc_interface xpc_interface = { + (void (*)(int)) xpc_notloaded, + (void (*)(int)) xpc_notloaded, + (enum xpc_retval (*)(partid_t, int, u32, void **)) xpc_notloaded, + (enum xpc_retval (*)(partid_t, int, void *)) xpc_notloaded, + (enum xpc_retval (*)(partid_t, int, void *, xpc_notify_func, void *)) + xpc_notloaded, + (void (*)(partid_t, int, void *)) xpc_notloaded, + (enum xpc_retval (*)(partid_t, void *)) xpc_notloaded +}; + + +/* + * XPC calls this when it (the XPC module) has been loaded. + */ +void +xpc_set_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 *)) +{ + xpc_interface.connect = connect; + xpc_interface.disconnect = disconnect; + xpc_interface.allocate = allocate; + xpc_interface.send = send; + xpc_interface.send_notify = send_notify; + xpc_interface.received = received; + xpc_interface.partid_to_nasids = partid_to_nasids; +} + + +/* + * XPC calls this when it (the XPC module) is being unloaded. + */ +void +xpc_clear_interface(void) +{ + xpc_interface.connect = (void (*)(int)) xpc_notloaded; + xpc_interface.disconnect = (void (*)(int)) xpc_notloaded; + xpc_interface.allocate = (enum xpc_retval (*)(partid_t, int, u32, + void **)) xpc_notloaded; + xpc_interface.send = (enum xpc_retval (*)(partid_t, int, void *)) + xpc_notloaded; + xpc_interface.send_notify = (enum xpc_retval (*)(partid_t, int, void *, + xpc_notify_func, void *)) xpc_notloaded; + xpc_interface.received = (void (*)(partid_t, int, void *)) + xpc_notloaded; + xpc_interface.partid_to_nasids = (enum xpc_retval (*)(partid_t, void *)) + xpc_notloaded; +} + + +/* + * Register for automatic establishment of a channel connection whenever + * a partition comes up. + * + * Arguments: + * + * ch_number - channel # to register for connection. + * func - function to call for asynchronous notification of channel + * state changes (i.e., connection, disconnection, error) and + * the arrival of incoming messages. + * key - pointer to optional user-defined value that gets passed back + * to the user on any callouts made to func. + * payload_size - size in bytes of the XPC message's payload area which + * contains a user-defined message. The user should make + * this large enough to hold their largest message. + * nentries - max #of XPC message entries a message queue can contain. + * The actual number, which is determined when a connection + * is established and may be less then requested, will be + * passed to the user via the xpcConnected callout. + * assigned_limit - max number of kthreads allowed to be processing + * messages (per connection) at any given instant. + * idle_limit - max number of kthreads allowed to be idle at any given + * instant. + */ +enum xpc_retval +xpc_connect(int ch_number, xpc_channel_func func, void *key, u16 payload_size, + u16 nentries, u32 assigned_limit, u32 idle_limit) +{ + struct xpc_registration *registration; + + + DBUG_ON(ch_number < 0 || ch_number >= XPC_NCHANNELS); + DBUG_ON(payload_size == 0 || nentries == 0); + DBUG_ON(func == NULL); + DBUG_ON(assigned_limit == 0 || idle_limit > assigned_limit); + + registration = &xpc_registrations[ch_number]; + + if (down_interruptible(®istration->sema) != 0) { + return xpcInterrupted; + } + + /* if XPC_CHANNEL_REGISTERED(ch_number) */ + if (registration->func != NULL) { + up(®istration->sema); + return xpcAlreadyRegistered; + } + + /* register the channel for connection */ + registration->msg_size = XPC_MSG_SIZE(payload_size); + registration->nentries = nentries; + registration->assigned_limit = assigned_limit; + registration->idle_limit = idle_limit; + registration->key = key; + registration->func = func; + + up(®istration->sema); + + xpc_interface.connect(ch_number); + + return xpcSuccess; +} + + +/* + * Remove the registration for automatic connection of the specified channel + * when a partition comes up. + * + * Before returning this xpc_disconnect() will wait for all connections on the + * specified channel have been closed/torndown. So the caller can be assured + * that they will not be receiving any more callouts from XPC to their + * function registered via xpc_connect(). + * + * Arguments: + * + * ch_number - channel # to unregister. + */ +void +xpc_disconnect(int ch_number) +{ + struct xpc_registration *registration; + + + DBUG_ON(ch_number < 0 || ch_number >= XPC_NCHANNELS); + + registration = &xpc_registrations[ch_number]; + + /* + * We've decided not to make this a down_interruptible(), since we + * figured XPC's users will just turn around and call xpc_disconnect() + * again anyways, so we might as well wait, if need be. + */ + down(®istration->sema); + + /* if !XPC_CHANNEL_REGISTERED(ch_number) */ + if (registration->func == NULL) { + up(®istration->sema); + return; + } + + /* remove the connection registration for the specified channel */ + registration->func = NULL; + registration->key = NULL; + registration->nentries = 0; + registration->msg_size = 0; + registration->assigned_limit = 0; + registration->idle_limit = 0; + + xpc_interface.disconnect(ch_number); + + up(®istration->sema); + + return; +} + + +int __init +xp_init(void) +{ + int ret, ch_number; + u64 func_addr = *(u64 *) xp_nofault_PIOR; + u64 err_func_addr = *(u64 *) xp_error_PIOR; + + + if (!ia64_platform_is("sn2")) { + return -ENODEV; + } + + /* + * Register a nofault code region which performs a cross-partition + * PIO read. If the PIO read times out, the MCA handler will consume + * the error and return to a kernel-provided instruction to indicate + * an error. This PIO read exists because it is guaranteed to timeout + * if the destination is down (AMO operations do not timeout on at + * least some CPUs on Shubs <= v1.2, which unfortunately we have to + * work around). + */ + if ((ret = sn_register_nofault_code(func_addr, err_func_addr, + err_func_addr, 1, 1)) != 0) { + printk(KERN_ERR "XP: can't register nofault code, error=%d\n", + ret); + } + /* + * Setup the nofault PIO read target. (There is no special reason why + * SH_IPI_ACCESS was selected.) + */ + if (is_shub2()) { + xp_nofault_PIOR_target = SH2_IPI_ACCESS0; + } else { + xp_nofault_PIOR_target = SH1_IPI_ACCESS; + } + + /* initialize the connection registration semaphores */ + for (ch_number = 0; ch_number < XPC_NCHANNELS; ch_number++) { + sema_init(&xpc_registrations[ch_number].sema, 1); /* mutex */ + } + + return 0; +} +module_init(xp_init); + + +void __exit +xp_exit(void) +{ + u64 func_addr = *(u64 *) xp_nofault_PIOR; + u64 err_func_addr = *(u64 *) xp_error_PIOR; + + + /* unregister the PIO read nofault code region */ + (void) sn_register_nofault_code(func_addr, err_func_addr, + err_func_addr, 1, 0); +} +module_exit(xp_exit); + + +MODULE_AUTHOR("Silicon Graphics, Inc."); +MODULE_DESCRIPTION("Cross Partition (XP) base"); +MODULE_LICENSE("GPL"); + +EXPORT_SYMBOL(xp_nofault_PIOR); +EXPORT_SYMBOL(xp_nofault_PIOR_target); +EXPORT_SYMBOL(xpc_registrations); +EXPORT_SYMBOL(xpc_interface); +EXPORT_SYMBOL(xpc_clear_interface); +EXPORT_SYMBOL(xpc_set_interface); +EXPORT_SYMBOL(xpc_connect); +EXPORT_SYMBOL(xpc_disconnect); + diff --git a/arch/ia64/sn/kernel/xp_nofault.S b/arch/ia64/sn/kernel/xp_nofault.S new file mode 100644 index 000000000000..b772543053c9 --- /dev/null +++ b/arch/ia64/sn/kernel/xp_nofault.S @@ -0,0 +1,31 @@ +/* + * 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. + */ + + +/* + * The xp_nofault_PIOR function takes a pointer to a remote PIO register + * and attempts to load and consume a value from it. This function + * will be registered as a nofault code block. In the event that the + * PIO read fails, the MCA handler will force the error to look + * corrected and vector to the xp_error_PIOR which will return an error. + * + * extern int xp_nofault_PIOR(void *remote_register); + */ + + .global xp_nofault_PIOR +xp_nofault_PIOR: + mov r8=r0 // Stage a success return value + ld8.acq r9=[r32];; // PIO Read the specified register + adds r9=1,r9 // Add to force a consume + br.ret.sptk.many b0;; // Return success + + .global xp_error_PIOR +xp_error_PIOR: + mov r8=1 // Return value of 1 + br.ret.sptk.many b0;; // Return failure + diff --git a/include/asm-ia64/sn/xp.h b/include/asm-ia64/sn/xp.h new file mode 100644 index 000000000000..9902185c0288 --- /dev/null +++ b/include/asm-ia64/sn/xp.h @@ -0,0 +1,436 @@ +/* + * 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/version.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 */ + |