89 lines
2.3 KiB
C
89 lines
2.3 KiB
C
/*
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* Copyright 2001 Mike Corrigan IBM Corp
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/stddef.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <asm/system.h>
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#include <asm/iSeries/HvLpEvent.h>
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#include <asm/iSeries/HvCallEvent.h>
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#include <asm/iSeries/LparData.h>
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/* Array of LpEvent handler functions */
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LpEventHandler lpEventHandler[HvLpEvent_Type_NumTypes];
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unsigned lpEventHandlerPaths[HvLpEvent_Type_NumTypes];
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/* Register a handler for an LpEvent type */
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int HvLpEvent_registerHandler( HvLpEvent_Type eventType, LpEventHandler handler )
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{
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int rc = 1;
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if ( eventType < HvLpEvent_Type_NumTypes ) {
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lpEventHandler[eventType] = handler;
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rc = 0;
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}
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return rc;
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}
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int HvLpEvent_unregisterHandler( HvLpEvent_Type eventType )
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{
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int rc = 1;
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might_sleep();
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if ( eventType < HvLpEvent_Type_NumTypes ) {
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if ( !lpEventHandlerPaths[eventType] ) {
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lpEventHandler[eventType] = NULL;
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rc = 0;
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/* We now sleep until all other CPUs have scheduled. This ensures that
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* the deletion is seen by all other CPUs, and that the deleted handler
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* isn't still running on another CPU when we return. */
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synchronize_rcu();
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}
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}
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return rc;
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}
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EXPORT_SYMBOL(HvLpEvent_registerHandler);
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EXPORT_SYMBOL(HvLpEvent_unregisterHandler);
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/* (lpIndex is the partition index of the target partition.
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* needed only for VirtualIo, VirtualLan and SessionMgr. Zero
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* indicates to use our partition index - for the other types)
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*/
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int HvLpEvent_openPath( HvLpEvent_Type eventType, HvLpIndex lpIndex )
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{
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int rc = 1;
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if ( eventType < HvLpEvent_Type_NumTypes &&
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lpEventHandler[eventType] ) {
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if ( lpIndex == 0 )
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lpIndex = itLpNaca.xLpIndex;
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HvCallEvent_openLpEventPath( lpIndex, eventType );
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++lpEventHandlerPaths[eventType];
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rc = 0;
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}
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return rc;
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}
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int HvLpEvent_closePath( HvLpEvent_Type eventType, HvLpIndex lpIndex )
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{
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int rc = 1;
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if ( eventType < HvLpEvent_Type_NumTypes &&
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lpEventHandler[eventType] &&
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lpEventHandlerPaths[eventType] ) {
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if ( lpIndex == 0 )
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lpIndex = itLpNaca.xLpIndex;
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HvCallEvent_closeLpEventPath( lpIndex, eventType );
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--lpEventHandlerPaths[eventType];
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rc = 0;
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}
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return rc;
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}
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