1 /* 2 * Copyright (C) 2001 Mike Corrigan IBM Corporation 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; either version 2 of the License, or 7 * (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 17 */ 18 #ifndef _ASM_POWERPC_ISERIES_IT_LP_QUEUE_H 19 #define _ASM_POWERPC_ISERIES_IT_LP_QUEUE_H 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 #include <asm/types.h> 28 #include <asm/ptrace.h> 29 30 #define IT_LP_MAX_QUEUES 8 31 32 #define IT_LP_NOT_USED 0 /* Queue will not be used by PLIC */ 33 #define IT_LP_DEDICATED_IO 1 /* Queue dedicated to IO processor specified */ 34 #define IT_LP_DEDICATED_LP 2 /* Queue dedicated to LP specified */ 35 #define IT_LP_SHARED 3 /* Queue shared for both IO and LP */ 36 37 #define IT_LP_EVENT_STACK_SIZE 4096 38 #define IT_LP_EVENT_MAX_SIZE 256 39 #define IT_LP_EVENT_ALIGN 64 40 41 struct hvlpevent_queue { 42 /* 43 * The hq_current_event is the pointer to the next event stack entry 44 * that will become valid. The OS must peek at this entry to determine 45 * if it is valid. PLIC will set the valid indicator as the very last 46 * store into that entry. 47 * 48 * When the OS has completed processing of the event then it will mark 49 * the event as invalid so that PLIC knows it can store into that event 50 * location again. 51 * 52 * If the event stack fills and there are overflow events, then PLIC 53 * will set the hq_overflow_pending flag in which case the OS will 54 * have to fetch the additional LP events once they have drained the 55 * event stack. 56 * 57 * The first 16-bytes are known by both the OS and PLIC. The remainder 58 * of the cache line is for use by the OS. 59 */ 60 u8 hq_overflow_pending; /* 0x00 Overflow events are pending */ 61 u8 hq_status; /* 0x01 DedicatedIo or DedicatedLp or NotUsed */ 62 u16 hq_proc_index; /* 0x02 Logical Proc Index for correlation */ 63 u8 hq_reserved1[12]; /* 0x04 */ 64 char *hq_current_event; /* 0x10 */ 65 char *hq_last_event; /* 0x18 */ 66 char *hq_event_stack; /* 0x20 */ 67 u8 hq_index; /* 0x28 unique sequential index. */ 68 u8 hq_reserved2[3]; /* 0x29-2b */ 69 spinlock_t hq_lock; 70 }; 71 72 extern struct hvlpevent_queue hvlpevent_queue; 73 74 extern int hvlpevent_is_pending(void); 75 extern void process_hvlpevents(void); 76 extern void setup_hvlpevent_queue(void); 77 78 #endif /* _ASM_POWERPC_ISERIES_IT_LP_QUEUE_H */ 79