/* * 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) 2004-2008 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/module.h> #include <linux/device.h> #include "xp.h" /* define the XP debug device structures to be used with dev_dbg() et al */ struct device_driver xp_dbg_name = { .name = "xp" }; struct device xp_dbg_subname = { .init_name = "", /* set to "" */ .driver = &xp_dbg_name }; struct device *xp = &xp_dbg_subname; /* max #of partitions possible */ short xp_max_npartitions; EXPORT_SYMBOL_GPL(xp_max_npartitions); short xp_partition_id; EXPORT_SYMBOL_GPL(xp_partition_id); u8 xp_region_size; EXPORT_SYMBOL_GPL(xp_region_size); unsigned long (*xp_pa) (void *addr); EXPORT_SYMBOL_GPL(xp_pa); unsigned long (*xp_socket_pa) (unsigned long gpa); EXPORT_SYMBOL_GPL(xp_socket_pa); enum xp_retval (*xp_remote_memcpy) (unsigned long dst_gpa, const unsigned long src_gpa, size_t len); EXPORT_SYMBOL_GPL(xp_remote_memcpy); int (*xp_cpu_to_nasid) (int cpuid); EXPORT_SYMBOL_GPL(xp_cpu_to_nasid); enum xp_retval (*xp_expand_memprotect) (unsigned long phys_addr, unsigned long size); EXPORT_SYMBOL_GPL(xp_expand_memprotect); enum xp_retval (*xp_restrict_memprotect) (unsigned long phys_addr, unsigned long size); EXPORT_SYMBOL_GPL(xp_restrict_memprotect); /* * xpc_registrations[] keeps track of xpc_connect()'s done by the kernel-level * users of XPC. */ struct xpc_registration xpc_registrations[XPC_MAX_NCHANNELS]; EXPORT_SYMBOL_GPL(xpc_registrations); /* * Initialize the XPC interface to NULL to indicate that XPC isn't loaded. */ struct xpc_interface xpc_interface = { }; EXPORT_SYMBOL_GPL(xpc_interface); /* * XPC calls this when it (the XPC module) has been loaded. */ void xpc_set_interface(void (*connect) (int), void (*disconnect) (int), enum xp_retval (*send) (short, int, u32, void *, u16), enum xp_retval (*send_notify) (short, int, u32, void *, u16, xpc_notify_func, void *), void (*received) (short, int, void *), enum xp_retval (*partid_to_nasids) (short, void *)) { xpc_interface.connect = connect; xpc_interface.disconnect = disconnect; xpc_interface.send = send; xpc_interface.send_notify = send_notify; xpc_interface.received = received; xpc_interface.partid_to_nasids = partid_to_nasids; } EXPORT_SYMBOL_GPL(xpc_set_interface); /* * XPC calls this when it (the XPC module) is being unloaded. */ void xpc_clear_interface(void) { memset(&xpc_interface, 0, sizeof(xpc_interface)); } EXPORT_SYMBOL_GPL(xpc_clear_interface); /* * 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 xpConnected 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 xp_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_MAX_NCHANNELS); DBUG_ON(payload_size == 0 || nentries == 0); DBUG_ON(func == NULL); DBUG_ON(assigned_limit == 0 || idle_limit > assigned_limit); if (XPC_MSG_SIZE(payload_size) > XPC_MSG_MAX_SIZE) return xpPayloadTooBig; registration = &xpc_registrations[ch_number]; if (mutex_lock_interruptible(®istration->mutex) != 0) return xpInterrupted; /* if XPC_CHANNEL_REGISTERED(ch_number) */ if (registration->func != NULL) { mutex_unlock(®istration->mutex); return xpAlreadyRegistered; } /* register the channel for connection */ registration->entry_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; mutex_unlock(®istration->mutex); if (xpc_interface.connect) xpc_interface.connect(ch_number); return xpSuccess; } EXPORT_SYMBOL_GPL(xpc_connect); /* * 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_MAX_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. */ mutex_lock(®istration->mutex); /* if !XPC_CHANNEL_REGISTERED(ch_number) */ if (registration->func == NULL) { mutex_unlock(®istration->mutex); return; } /* remove the connection registration for the specified channel */ registration->func = NULL; registration->key = NULL; registration->nentries = 0; registration->entry_size = 0; registration->assigned_limit = 0; registration->idle_limit = 0; if (xpc_interface.disconnect) xpc_interface.disconnect(ch_number); mutex_unlock(®istration->mutex); return; } EXPORT_SYMBOL_GPL(xpc_disconnect); int __init xp_init(void) { enum xp_retval ret; int ch_number; /* initialize the connection registration mutex */ for (ch_number = 0; ch_number < XPC_MAX_NCHANNELS; ch_number++) mutex_init(&xpc_registrations[ch_number].mutex); if (is_shub()) ret = xp_init_sn2(); else if (is_uv()) ret = xp_init_uv(); else ret = 0; if (ret != xpSuccess) return ret; return 0; } module_init(xp_init); void __exit xp_exit(void) { if (is_shub()) xp_exit_sn2(); else if (is_uv()) xp_exit_uv(); } module_exit(xp_exit); MODULE_AUTHOR("Silicon Graphics, Inc."); MODULE_DESCRIPTION("Cross Partition (XP) base"); MODULE_LICENSE("GPL");