Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 167 insertions, 0 deletions

diff --git a/arch/ppc64/kernel/ItLpQueue.c b/arch/ppc64/kernel/ItLpQueue.c
new file mode 100644
index 000000000000..c923a815760e
--- /dev/null
+++ b/arch/ppc64/kernel/ItLpQueue.c
@@ -0,0 +1,167 @@
+/*
+ * ItLpQueue.c
+ * Copyright (C) 2001 Mike Corrigan  IBM Corporation
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/stddef.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <asm/system.h>
+#include <asm/paca.h>
+#include <asm/iSeries/ItLpQueue.h>
+#include <asm/iSeries/HvLpEvent.h>
+#include <asm/iSeries/HvCallEvent.h>
+#include <asm/iSeries/LparData.h>
+
+static __inline__ int set_inUse( struct ItLpQueue * lpQueue )
+{
+        int t;
+        u32 * inUseP = &(lpQueue->xInUseWord);
+
+        __asm__ __volatile__("\n\
+1:      lwarx   %0,0,%2         \n\
+        cmpwi   0,%0,0          \n\
+        li      %0,0            \n\
+        bne-    2f              \n\
+        addi    %0,%0,1         \n\
+        stwcx.  %0,0,%2         \n\
+        bne-    1b              \n\
+2:      eieio"
+        : "=&r" (t), "=m" (lpQueue->xInUseWord)
+        : "r" (inUseP), "m" (lpQueue->xInUseWord)
+        : "cc");
+
+        return t;
+}
+
+static __inline__ void clear_inUse( struct ItLpQueue * lpQueue )
+{
+        lpQueue->xInUseWord = 0;
+}
+
+/* Array of LpEvent handler functions */
+extern LpEventHandler lpEventHandler[HvLpEvent_Type_NumTypes];
+unsigned long ItLpQueueInProcess = 0;
+
+struct HvLpEvent * ItLpQueue_getNextLpEvent( struct ItLpQueue * lpQueue )
+{
+        struct HvLpEvent * nextLpEvent = 
+                (struct HvLpEvent *)lpQueue->xSlicCurEventPtr;
+        if ( nextLpEvent->xFlags.xValid ) {
+                /* rmb() needed only for weakly consistent machines (regatta) */
+                rmb();
+                /* Set pointer to next potential event */
+                lpQueue->xSlicCurEventPtr += ((nextLpEvent->xSizeMinus1 +
+                                      LpEventAlign ) /
+                                      LpEventAlign ) *
+                                      LpEventAlign;
+                /* Wrap to beginning if no room at end */
+                if (lpQueue->xSlicCurEventPtr > lpQueue->xSlicLastValidEventPtr)
+                        lpQueue->xSlicCurEventPtr = lpQueue->xSlicEventStackPtr;
+        }
+        else 
+                nextLpEvent = NULL;
+
+        return nextLpEvent;
+}
+
+int ItLpQueue_isLpIntPending( struct ItLpQueue * lpQueue )
+{
+        int retval = 0;
+        struct HvLpEvent * nextLpEvent;
+        if ( lpQueue ) {
+                nextLpEvent = (struct HvLpEvent *)lpQueue->xSlicCurEventPtr;
+                retval = nextLpEvent->xFlags.xValid | lpQueue->xPlicOverflowIntPending;
+        }
+        return retval;
+}
+
+void ItLpQueue_clearValid( struct HvLpEvent * event )
+{
+        /* Clear the valid bit of the event
+         * Also clear bits within this event that might
+         * look like valid bits (on 64-byte boundaries)
+         */
+        unsigned extra = (( event->xSizeMinus1 + LpEventAlign ) /
+                                                 LpEventAlign ) - 1;
+        switch ( extra ) {
+          case 3:
+           ((struct HvLpEvent*)((char*)event+3*LpEventAlign))->xFlags.xValid=0;
+          case 2:
+           ((struct HvLpEvent*)((char*)event+2*LpEventAlign))->xFlags.xValid=0;
+          case 1:
+           ((struct HvLpEvent*)((char*)event+1*LpEventAlign))->xFlags.xValid=0;
+          case 0:
+           ;    
+        }
+        mb();
+        event->xFlags.xValid = 0;
+}
+
+unsigned ItLpQueue_process( struct ItLpQueue * lpQueue, struct pt_regs *regs )
+{
+        unsigned numIntsProcessed = 0;
+        struct HvLpEvent * nextLpEvent;
+
+        /* If we have recursed, just return */
+        if ( !set_inUse( lpQueue ) )
+                return 0;
+        
+        if (ItLpQueueInProcess == 0)
+                ItLpQueueInProcess = 1;
+        else
+                BUG();
+
+        for (;;) {
+                nextLpEvent = ItLpQueue_getNextLpEvent( lpQueue );
+                if ( nextLpEvent ) {
+                        /* Count events to return to caller
+                         * and count processed events in lpQueue
+                         */
+                        ++numIntsProcessed;
+                        lpQueue->xLpIntCount++;         
+                        /* Call appropriate handler here, passing 
+                         * a pointer to the LpEvent.  The handler
+                         * must make a copy of the LpEvent if it
+                         * needs it in a bottom half. (perhaps for
+                         * an ACK)
+                         *      
+                         *  Handlers are responsible for ACK processing 
+                         *
+                         * The Hypervisor guarantees that LpEvents will
+                         * only be delivered with types that we have
+                         * registered for, so no type check is necessary
+                         * here!
+                         */
+                        if ( nextLpEvent->xType < HvLpEvent_Type_NumTypes )
+                                lpQueue->xLpIntCountByType[nextLpEvent->xType]++;
+                        if ( nextLpEvent->xType < HvLpEvent_Type_NumTypes &&
+                             lpEventHandler[nextLpEvent->xType] ) 
+                                lpEventHandler[nextLpEvent->xType](nextLpEvent, regs);
+                        else
+                                printk(KERN_INFO "Unexpected Lp Event type=%d\n", nextLpEvent->xType );
+                        
+                        ItLpQueue_clearValid( nextLpEvent );
+                } else if ( lpQueue->xPlicOverflowIntPending )
+                        /*
+                         * No more valid events. If overflow events are
+                         * pending process them
+                         */
+                        HvCallEvent_getOverflowLpEvents( lpQueue->xIndex);
+                else
+                        break;
+        }
+
+        ItLpQueueInProcess = 0;
+        mb();
+        clear_inUse( lpQueue );
+
+        get_paca()->lpevent_count += numIntsProcessed;
+
+        return numIntsProcessed;
+}