| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2001 Mike Corrigan IBM Corp |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; either version |
| 7 | * 2 of the License, or (at your option) any later version. |
| 8 | */ |
| 9 | #include <linux/stddef.h> |
| 10 | #include <linux/kernel.h> |
| 11 | #include <linux/module.h> |
| 12 | #include <asm/system.h> |
| 13 | #include <asm/iSeries/HvLpEvent.h> |
| 14 | #include <asm/iSeries/HvCallEvent.h> |
| 15 | #include <asm/iSeries/LparData.h> |
| 16 | |
| 17 | /* Array of LpEvent handler functions */ |
| 18 | LpEventHandler lpEventHandler[HvLpEvent_Type_NumTypes]; |
| 19 | unsigned lpEventHandlerPaths[HvLpEvent_Type_NumTypes]; |
| 20 | |
| 21 | /* Register a handler for an LpEvent type */ |
| 22 | |
| 23 | int HvLpEvent_registerHandler( HvLpEvent_Type eventType, LpEventHandler handler ) |
| 24 | { |
| 25 | int rc = 1; |
| 26 | if ( eventType < HvLpEvent_Type_NumTypes ) { |
| 27 | lpEventHandler[eventType] = handler; |
| 28 | rc = 0; |
| 29 | } |
| 30 | return rc; |
| 31 | |
| 32 | } |
| 33 | |
| 34 | int HvLpEvent_unregisterHandler( HvLpEvent_Type eventType ) |
| 35 | { |
| 36 | int rc = 1; |
| 37 | |
| 38 | might_sleep(); |
| 39 | |
| 40 | if ( eventType < HvLpEvent_Type_NumTypes ) { |
| 41 | if ( !lpEventHandlerPaths[eventType] ) { |
| 42 | lpEventHandler[eventType] = NULL; |
| 43 | rc = 0; |
| 44 | |
| 45 | /* We now sleep until all other CPUs have scheduled. This ensures that |
| 46 | * the deletion is seen by all other CPUs, and that the deleted handler |
| 47 | * isn't still running on another CPU when we return. */ |
| 48 | synchronize_kernel(); |
| 49 | } |
| 50 | } |
| 51 | return rc; |
| 52 | } |
| 53 | EXPORT_SYMBOL(HvLpEvent_registerHandler); |
| 54 | EXPORT_SYMBOL(HvLpEvent_unregisterHandler); |
| 55 | |
| 56 | /* (lpIndex is the partition index of the target partition. |
| 57 | * needed only for VirtualIo, VirtualLan and SessionMgr. Zero |
| 58 | * indicates to use our partition index - for the other types) |
| 59 | */ |
| 60 | int HvLpEvent_openPath( HvLpEvent_Type eventType, HvLpIndex lpIndex ) |
| 61 | { |
| 62 | int rc = 1; |
| 63 | if ( eventType < HvLpEvent_Type_NumTypes && |
| 64 | lpEventHandler[eventType] ) { |
| 65 | if ( lpIndex == 0 ) |
| 66 | lpIndex = itLpNaca.xLpIndex; |
| 67 | HvCallEvent_openLpEventPath( lpIndex, eventType ); |
| 68 | ++lpEventHandlerPaths[eventType]; |
| 69 | rc = 0; |
| 70 | } |
| 71 | return rc; |
| 72 | } |
| 73 | |
| 74 | int HvLpEvent_closePath( HvLpEvent_Type eventType, HvLpIndex lpIndex ) |
| 75 | { |
| 76 | int rc = 1; |
| 77 | if ( eventType < HvLpEvent_Type_NumTypes && |
| 78 | lpEventHandler[eventType] && |
| 79 | lpEventHandlerPaths[eventType] ) { |
| 80 | if ( lpIndex == 0 ) |
| 81 | lpIndex = itLpNaca.xLpIndex; |
| 82 | HvCallEvent_closeLpEventPath( lpIndex, eventType ); |
| 83 | --lpEventHandlerPaths[eventType]; |
| 84 | rc = 0; |
| 85 | } |
| 86 | return rc; |
| 87 | } |
| 88 | |