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261 lines
7.0 KiB
261 lines
7.0 KiB
/* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file "COPYING" in the main directory of this archive |
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* for more details. |
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* |
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* (C) Copyright 2020 Hewlett Packard Enterprise Development LP |
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* Copyright (c) 2004-2008 Silicon Graphics, Inc. All Rights Reserved. |
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*/ |
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/* |
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* Cross Partition (XP) base. |
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* |
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* XP provides a base from which its users can interact |
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* with XPC, yet not be dependent on XPC. |
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* |
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*/ |
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#include <linux/module.h> |
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#include <linux/device.h> |
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#include "xp.h" |
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/* define the XP debug device structures to be used with dev_dbg() et al */ |
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struct device_driver xp_dbg_name = { |
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.name = "xp" |
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}; |
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struct device xp_dbg_subname = { |
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.init_name = "", /* set to "" */ |
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.driver = &xp_dbg_name |
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}; |
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struct device *xp = &xp_dbg_subname; |
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/* max #of partitions possible */ |
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short xp_max_npartitions; |
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EXPORT_SYMBOL_GPL(xp_max_npartitions); |
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short xp_partition_id; |
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EXPORT_SYMBOL_GPL(xp_partition_id); |
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u8 xp_region_size; |
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EXPORT_SYMBOL_GPL(xp_region_size); |
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unsigned long (*xp_pa) (void *addr); |
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EXPORT_SYMBOL_GPL(xp_pa); |
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unsigned long (*xp_socket_pa) (unsigned long gpa); |
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EXPORT_SYMBOL_GPL(xp_socket_pa); |
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enum xp_retval (*xp_remote_memcpy) (unsigned long dst_gpa, |
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const unsigned long src_gpa, size_t len); |
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EXPORT_SYMBOL_GPL(xp_remote_memcpy); |
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int (*xp_cpu_to_nasid) (int cpuid); |
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EXPORT_SYMBOL_GPL(xp_cpu_to_nasid); |
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enum xp_retval (*xp_expand_memprotect) (unsigned long phys_addr, |
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unsigned long size); |
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EXPORT_SYMBOL_GPL(xp_expand_memprotect); |
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enum xp_retval (*xp_restrict_memprotect) (unsigned long phys_addr, |
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unsigned long size); |
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EXPORT_SYMBOL_GPL(xp_restrict_memprotect); |
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/* |
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* xpc_registrations[] keeps track of xpc_connect()'s done by the kernel-level |
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* users of XPC. |
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*/ |
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struct xpc_registration xpc_registrations[XPC_MAX_NCHANNELS]; |
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EXPORT_SYMBOL_GPL(xpc_registrations); |
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/* |
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* Initialize the XPC interface to NULL to indicate that XPC isn't loaded. |
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*/ |
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struct xpc_interface xpc_interface = { }; |
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EXPORT_SYMBOL_GPL(xpc_interface); |
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/* |
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* XPC calls this when it (the XPC module) has been loaded. |
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*/ |
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void |
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xpc_set_interface(void (*connect) (int), |
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void (*disconnect) (int), |
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enum xp_retval (*send) (short, int, u32, void *, u16), |
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enum xp_retval (*send_notify) (short, int, u32, void *, u16, |
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xpc_notify_func, void *), |
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void (*received) (short, int, void *), |
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enum xp_retval (*partid_to_nasids) (short, void *)) |
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{ |
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xpc_interface.connect = connect; |
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xpc_interface.disconnect = disconnect; |
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xpc_interface.send = send; |
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xpc_interface.send_notify = send_notify; |
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xpc_interface.received = received; |
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xpc_interface.partid_to_nasids = partid_to_nasids; |
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} |
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EXPORT_SYMBOL_GPL(xpc_set_interface); |
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/* |
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* XPC calls this when it (the XPC module) is being unloaded. |
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*/ |
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void |
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xpc_clear_interface(void) |
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{ |
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memset(&xpc_interface, 0, sizeof(xpc_interface)); |
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} |
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EXPORT_SYMBOL_GPL(xpc_clear_interface); |
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/* |
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* Register for automatic establishment of a channel connection whenever |
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* a partition comes up. |
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* |
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* Arguments: |
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* |
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* ch_number - channel # to register for connection. |
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* func - function to call for asynchronous notification of channel |
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* state changes (i.e., connection, disconnection, error) and |
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* the arrival of incoming messages. |
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* key - pointer to optional user-defined value that gets passed back |
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* to the user on any callouts made to func. |
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* payload_size - size in bytes of the XPC message's payload area which |
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* contains a user-defined message. The user should make |
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* this large enough to hold their largest message. |
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* nentries - max #of XPC message entries a message queue can contain. |
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* The actual number, which is determined when a connection |
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* is established and may be less then requested, will be |
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* passed to the user via the xpConnected callout. |
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* assigned_limit - max number of kthreads allowed to be processing |
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* messages (per connection) at any given instant. |
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* idle_limit - max number of kthreads allowed to be idle at any given |
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* instant. |
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*/ |
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enum xp_retval |
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xpc_connect(int ch_number, xpc_channel_func func, void *key, u16 payload_size, |
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u16 nentries, u32 assigned_limit, u32 idle_limit) |
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{ |
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struct xpc_registration *registration; |
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DBUG_ON(ch_number < 0 || ch_number >= XPC_MAX_NCHANNELS); |
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DBUG_ON(payload_size == 0 || nentries == 0); |
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DBUG_ON(func == NULL); |
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DBUG_ON(assigned_limit == 0 || idle_limit > assigned_limit); |
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if (XPC_MSG_SIZE(payload_size) > XPC_MSG_MAX_SIZE) |
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return xpPayloadTooBig; |
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registration = &xpc_registrations[ch_number]; |
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if (mutex_lock_interruptible(®istration->mutex) != 0) |
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return xpInterrupted; |
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/* if XPC_CHANNEL_REGISTERED(ch_number) */ |
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if (registration->func != NULL) { |
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mutex_unlock(®istration->mutex); |
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return xpAlreadyRegistered; |
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} |
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/* register the channel for connection */ |
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registration->entry_size = XPC_MSG_SIZE(payload_size); |
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registration->nentries = nentries; |
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registration->assigned_limit = assigned_limit; |
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registration->idle_limit = idle_limit; |
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registration->key = key; |
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registration->func = func; |
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mutex_unlock(®istration->mutex); |
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if (xpc_interface.connect) |
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xpc_interface.connect(ch_number); |
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return xpSuccess; |
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} |
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EXPORT_SYMBOL_GPL(xpc_connect); |
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/* |
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* Remove the registration for automatic connection of the specified channel |
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* when a partition comes up. |
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* |
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* Before returning this xpc_disconnect() will wait for all connections on the |
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* specified channel have been closed/torndown. So the caller can be assured |
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* that they will not be receiving any more callouts from XPC to their |
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* function registered via xpc_connect(). |
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* |
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* Arguments: |
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* |
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* ch_number - channel # to unregister. |
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*/ |
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void |
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xpc_disconnect(int ch_number) |
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{ |
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struct xpc_registration *registration; |
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DBUG_ON(ch_number < 0 || ch_number >= XPC_MAX_NCHANNELS); |
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registration = &xpc_registrations[ch_number]; |
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/* |
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* We've decided not to make this a down_interruptible(), since we |
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* figured XPC's users will just turn around and call xpc_disconnect() |
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* again anyways, so we might as well wait, if need be. |
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*/ |
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mutex_lock(®istration->mutex); |
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/* if !XPC_CHANNEL_REGISTERED(ch_number) */ |
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if (registration->func == NULL) { |
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mutex_unlock(®istration->mutex); |
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return; |
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} |
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/* remove the connection registration for the specified channel */ |
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registration->func = NULL; |
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registration->key = NULL; |
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registration->nentries = 0; |
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registration->entry_size = 0; |
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registration->assigned_limit = 0; |
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registration->idle_limit = 0; |
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if (xpc_interface.disconnect) |
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xpc_interface.disconnect(ch_number); |
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mutex_unlock(®istration->mutex); |
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return; |
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} |
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EXPORT_SYMBOL_GPL(xpc_disconnect); |
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static int __init |
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xp_init(void) |
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{ |
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enum xp_retval ret; |
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int ch_number; |
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/* initialize the connection registration mutex */ |
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for (ch_number = 0; ch_number < XPC_MAX_NCHANNELS; ch_number++) |
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mutex_init(&xpc_registrations[ch_number].mutex); |
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if (is_uv_system()) |
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ret = xp_init_uv(); |
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else |
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ret = 0; |
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if (ret != xpSuccess) |
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return ret; |
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return 0; |
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} |
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module_init(xp_init); |
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static void __exit |
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xp_exit(void) |
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{ |
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if (is_uv_system()) |
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xp_exit_uv(); |
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} |
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module_exit(xp_exit); |
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MODULE_AUTHOR("Silicon Graphics, Inc."); |
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MODULE_DESCRIPTION("Cross Partition (XP) base"); |
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MODULE_LICENSE("GPL");
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