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