include/asm-ppc64/iSeries/ItLpQueue.h

   1 /*
   2  * ItLpQueue.h
   3  * Copyright (C) 2001  Mike Corrigan IBM Corporation
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  18  */
  19 #ifndef _ITLPQUEUE_H
  20 #define _ITLPQUEUE_H
  21
  22 //=============================================================================
  23 //
  24 //      This control block defines the simple LP queue structure that is
  25 //      shared between the hypervisor (PLIC) and the OS in order to send
  26 //      events to an LP.
  27 //
  28
  29 #include <asm/types.h>
  30 #include <asm/ptrace.h>
  31
  32 struct HvLpEvent;
  33
  34 #define ITMaxLpQueues 8
  35
  36 #define NotUsed         0       // Queue will not be used by PLIC
  37 #define DedicatedIo     1       // Queue dedicated to IO processor specified
  38 #define DedicatedLp     2       // Queue dedicated to LP specified
  39 #define Shared          3       // Queue shared for both IO and LP
  40
  41 #define LpEventStackSize 4096
  42 #define LpEventMaxSize   256
  43 #define LpEventAlign     64
  44
  45 struct ItLpQueue
  46 {
  47 //
  48 //  The xSlicCurEventPtr is the pointer to the next event stack entry that will
  49 //  become valid.  The OS must peek at this entry to determine if it is valid.
  50 //  PLIC will set the valid indicator as the very last store into that entry.
  51 //
  52 //  When the OS has completed processing of the event then it will mark the event
  53 //  as invalid so that PLIC knows it can store into that event location again.
  54 //
  55 // If the event stack fills and there are overflow events, then PLIC will set
  56 // the xPlicOverflowIntPending flag in which case the OS will have to fetch the
  57 // additional LP events once they have drained the event stack.
  58 //
  59 // The first 16-bytes are known by both the OS and PLIC.  The remainder of the
  60 // cache line is for use by the OS.
  61 //
  62 //=============================================================================
  63         u8      xPlicOverflowIntPending;// 0x00 Overflow events are pending
  64         u8      xPlicStatus;            // 0x01 DedicatedIo or DedicatedLp or NotUsed
  65         u16     xSlicLogicalProcIndex;  // 0x02 Logical Proc Index for correlation
  66         u8      xPlicRsvd[12];          // 0x04
  67         char*   xSlicCurEventPtr;       // 0x10
  68         char*   xSlicLastValidEventPtr; // 0x18
  69         char*   xSlicEventStackPtr;     // 0x20
  70         u8      xIndex;                 // 0x28 unique sequential index.
  71         u8      xSlicRsvd[3];           // 0x29-2b
  72         u32     xInUseWord;             // 0x2C
  73         u64     xLpIntCount;            // 0x30 Total Lp Int msgs processed
  74         u64     xLpIntCountByType[9];   // 0x38-0x7F Event counts by type
  75 };
  76
  77 extern struct ItLpQueue xItLpQueue;
  78
  79 extern struct HvLpEvent * ItLpQueue_getNextLpEvent( struct ItLpQueue * );
  80 extern int ItLpQueue_isLpIntPending( struct ItLpQueue * );
  81 extern unsigned ItLpQueue_process( struct ItLpQueue *, struct pt_regs * );
  82 extern void ItLpQueue_clearValid( struct HvLpEvent * );
  83
  84 static __inline__ void process_iSeries_events( void )
  85 {
  86         __asm__ __volatile__ (
  87         "       li      0,0x5555        \n\
  88                 sc"
  89         : : : "r0", "r3" );
  90 }
  91
  92 #endif /* _ITLPQUEUE_H */