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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 _ASM_POWERPC_ISERIES_IT_LP_QUEUE_H
20#define _ASM_POWERPC_ISERIES_IT_LP_QUEUE_H
21
22/*
23 * This control block defines the simple LP queue structure that is
24 * shared between the hypervisor (PLIC) and the OS in order to send
25 * events to an LP.
26 */
27
28#include <asm/types.h>
29#include <asm/ptrace.h>
30
31struct HvLpEvent;
32
33#define ITMaxLpQueues 8
34
35#define NotUsed 0 // Queue will not be used by PLIC
36#define DedicatedIo 1 // Queue dedicated to IO processor specified
37#define DedicatedLp 2 // Queue dedicated to LP specified
38#define Shared 3 // Queue shared for both IO and LP
39
40#define LpEventStackSize 4096
41#define LpEventMaxSize 256
42#define LpEventAlign 64
43
44struct hvlpevent_queue {
45/*
46 * The xSlicCurEventPtr is the pointer to the next event stack entry
47 * that will become valid. The OS must peek at this entry to determine
48 * if it is valid. PLIC will set the valid indicator as the very last
49 * store into that entry.
50 *
51 * When the OS has completed processing of the event then it will mark
52 * the event as invalid so that PLIC knows it can store into that event
53 * location again.
54 *
55 * If the event stack fills and there are overflow events, then PLIC
56 * will set the xPlicOverflowIntPending flag in which case the OS will
57 * have to fetch the additional LP events once they have drained the
58 * event stack.
59 *
60 * The first 16-bytes are known by both the OS and PLIC. The remainder
61 * of the cache line is for use by the OS.
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 spinlock_t lock;
73};
74
75extern struct hvlpevent_queue hvlpevent_queue;
76
77extern int hvlpevent_is_pending(void);
78extern void process_hvlpevents(struct pt_regs *);
79extern void setup_hvlpevent_queue(void);
80
81#endif /* _ASM_POWERPC_ISERIES_IT_LP_QUEUE_H */