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
20 //=============================================================================
21 //
22 // This control block defines the simple LP queue structure that is
23 // shared between the hypervisor (PLIC) and the OS in order to send
24 // events to an LP.
25 //
26
27 #ifndef _PPC_TYPES_H
28 #include <asm/types.h>
29 #endif
30 #include <asm/ptrace.h>
31
32
33 struct HvLpEvent;
34
35
36 #ifndef _ITLPQUEUE_H
37 #define _ITLPQUEUE_H
38
39 #define ITMaxLpQueues 8
40
41 #define NotUsed 0 // Queue will not be used by PLIC
42 #define DedicatedIo 1 // Queue dedicated to IO processor specified
43 #define DedicatedLp 2 // Queue dedicated to LP specified
44 #define Shared 3 // Queue shared for both IO and LP
45
46 #define LpEventStackSize 4096
47 #define LpEventMaxSize 256
48 #define LpEventAlign 64
49
50 struct ItLpQueue
51 {
52 //
53 // The xSlicCurEventPtr is the pointer to the next event stack entry that will
54 // become valid. The OS must peek at this entry to determine if it is valid.
55 // PLIC will set the valid indicator as the very last store into that entry.
56 //
57 // When the OS has completed processing of the event then it will mark the event
58 // as invalid so that PLIC knows it can store into that event location again.
59 //
60 // If the event stack fills and there are overflow events, then PLIC will set
61 // the xPlicOverflowIntPending flag in which case the OS will have to fetch the
62 // additional LP events once they have drained the event stack.
63 //
64 // The first 16-bytes are known by both the OS and PLIC. The remainder of the
65 // cache line is for use by the OS.
66 //
67 //=============================================================================
68 u8 xPlicOverflowIntPending;// 0x00 Overflow events are pending
69 u8 xPlicStatus; // 0x01 DedicatedIo or DedicatedLp or NotUsed
70 u16 xSlicLogicalProcIndex; // 0x02 Logical Proc Index for correlation
71 u8 xPlicRsvd[12]; // 0x04
72 char* xSlicCurEventPtr; // 0x10
73 char* xSlicLastValidEventPtr; // 0x18
74 char* xSlicEventStackPtr; // 0x20
75 u8 xIndex; // 0x28 unique sequential index.
76 u8 xSlicRsvd[3]; // 0x29-2b
77 u32 xInUseWord; // 0x2C
78 u64 xLpIntCount; // 0x30 Total Lp Int msgs processed
79 u64 xLpIntCountByType[9]; // 0x38-0x7F Event counts by type
80 };
81
82 extern struct ItLpQueue xItLpQueue;
83
84 extern struct HvLpEvent * ItLpQueue_getNextLpEvent( struct ItLpQueue * );
85 extern int ItLpQueue_isLpIntPending( struct ItLpQueue * );
86 extern unsigned ItLpQueue_process( struct ItLpQueue *, struct pt_regs * );
87 extern void ItLpQueue_clearValid( struct HvLpEvent * );
88
process_iSeries_events(void)89 static __inline__ void process_iSeries_events( void )
90 {
91 __asm__ __volatile__ (
92 " li 0,0x5555 \n\
93 sc"
94 : : : "r0", "r3" );
95 }
96
97
98 //=============================================================================
99 #endif // _ITLPQUEUE_H
100