79 lines
2.8 KiB
C
79 lines
2.8 KiB
C
/*
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* Copyright (C) 2001 Mike Corrigan IBM Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _ASM_POWERPC_ISERIES_IT_LP_QUEUE_H
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#define _ASM_POWERPC_ISERIES_IT_LP_QUEUE_H
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/*
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* This control block defines the simple LP queue structure that is
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* shared between the hypervisor (PLIC) and the OS in order to send
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* events to an LP.
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*/
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#include <asm/types.h>
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#include <asm/ptrace.h>
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#define IT_LP_MAX_QUEUES 8
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#define IT_LP_NOT_USED 0 /* Queue will not be used by PLIC */
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#define IT_LP_DEDICATED_IO 1 /* Queue dedicated to IO processor specified */
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#define IT_LP_DEDICATED_LP 2 /* Queue dedicated to LP specified */
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#define IT_LP_SHARED 3 /* Queue shared for both IO and LP */
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#define IT_LP_EVENT_STACK_SIZE 4096
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#define IT_LP_EVENT_MAX_SIZE 256
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#define IT_LP_EVENT_ALIGN 64
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struct hvlpevent_queue {
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/*
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* The hq_current_event is the pointer to the next event stack entry
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* that will become valid. The OS must peek at this entry to determine
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* if it is valid. PLIC will set the valid indicator as the very last
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* store into that entry.
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*
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* When the OS has completed processing of the event then it will mark
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* the event as invalid so that PLIC knows it can store into that event
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* location again.
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*
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* If the event stack fills and there are overflow events, then PLIC
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* will set the hq_overflow_pending flag in which case the OS will
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* have to fetch the additional LP events once they have drained the
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* event stack.
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*
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* The first 16-bytes are known by both the OS and PLIC. The remainder
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* of the cache line is for use by the OS.
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*/
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u8 hq_overflow_pending; /* 0x00 Overflow events are pending */
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u8 hq_status; /* 0x01 DedicatedIo or DedicatedLp or NotUsed */
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u16 hq_proc_index; /* 0x02 Logical Proc Index for correlation */
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u8 hq_reserved1[12]; /* 0x04 */
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char *hq_current_event; /* 0x10 */
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char *hq_last_event; /* 0x18 */
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char *hq_event_stack; /* 0x20 */
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u8 hq_index; /* 0x28 unique sequential index. */
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u8 hq_reserved2[3]; /* 0x29-2b */
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spinlock_t hq_lock;
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};
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extern struct hvlpevent_queue hvlpevent_queue;
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extern int hvlpevent_is_pending(void);
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extern void process_hvlpevents(void);
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extern void setup_hvlpevent_queue(void);
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#endif /* _ASM_POWERPC_ISERIES_IT_LP_QUEUE_H */
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