1 /* $NetBSD: rf_diskqueue.h,v 1.23 2009/03/23 18:38:54 oster Exp $ */ 2 /* 3 * Copyright (c) 1995 Carnegie-Mellon University. 4 * All rights reserved. 5 * 6 * Author: Mark Holland 7 * 8 * Permission to use, copy, modify and distribute this software and 9 * its documentation is hereby granted, provided that both the copyright 10 * notice and this permission notice appear in all copies of the 11 * software, derivative works or modified versions, and any portions 12 * thereof, and that both notices appear in supporting documentation. 13 * 14 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 15 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 16 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 17 * 18 * Carnegie Mellon requests users of this software to return to 19 * 20 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 21 * School of Computer Science 22 * Carnegie Mellon University 23 * Pittsburgh PA 15213-3890 24 * 25 * any improvements or extensions that they make and grant Carnegie the 26 * rights to redistribute these changes. 27 */ 28 29 /***************************************************************************************** 30 * 31 * rf_diskqueue.h -- header file for disk queues 32 * 33 * see comments in rf_diskqueue.c 34 * 35 ****************************************************************************************/ 36 37 38 #ifndef _RF__RF_DISKQUEUE_H_ 39 #define _RF__RF_DISKQUEUE_H_ 40 41 #include <sys/queue.h> 42 43 #include <dev/raidframe/raidframevar.h> 44 45 #include "rf_threadstuff.h" 46 #include "rf_acctrace.h" 47 #include "rf_alloclist.h" 48 #include "rf_etimer.h" 49 #include "rf_netbsd.h" 50 51 52 #define RF_IO_NORMAL_PRIORITY 1 53 #define RF_IO_LOW_PRIORITY 0 54 55 /* the data held by a disk queue entry */ 56 struct RF_DiskQueueData_s { 57 RF_SectorNum_t sectorOffset; /* sector offset into the disk */ 58 RF_SectorCount_t numSector; /* number of sectors to read/write */ 59 RF_IoType_t type; /* read/write/nop */ 60 void *buf; /* buffer pointer */ 61 RF_StripeNum_t parityStripeID; /* the RAID parity stripe ID this 62 * access is for */ 63 RF_ReconUnitNum_t which_ru; /* which RU within this parity stripe */ 64 int priority; /* the priority of this request */ 65 int (*CompleteFunc) (void *, int); /* function to be called upon 66 * completion */ 67 void *argument; /* argument to be passed to CompleteFunc */ 68 RF_Raid_t *raidPtr; /* needed for simulation */ 69 RF_AccTraceEntry_t *tracerec; /* perf mon only */ 70 RF_Etimer_t qtime; /* perf mon only - time request is in queue */ 71 RF_DiskQueueData_t *next; 72 RF_DiskQueueData_t *prev; 73 RF_DiskQueue_t *queue; /* the disk queue to which this req is 74 * targeted */ 75 RF_DiskQueueDataFlags_t flags; /* flags controlling operation */ 76 77 struct proc *b_proc; /* the b_proc from the original bp passed into 78 * the driver for this I/O */ 79 struct buf *bp; /* a bp to use to get this I/O done */ 80 /* TAILQ bits for a queue for completed I/O requests */ 81 TAILQ_ENTRY(RF_DiskQueueData_s) iodone_entries; 82 int error; /* Indicate if an error occurred 83 on this I/O (1=yes, 0=no) */ 84 }; 85 86 /* note: "Create" returns type-specific queue header pointer cast to (void *) */ 87 struct RF_DiskQueueSW_s { 88 RF_DiskQueueType_t queueType; 89 void *(*Create) (RF_SectorCount_t, RF_AllocListElem_t *, RF_ShutdownList_t **); /* creation routine -- 90 * one call per queue in 91 * system */ 92 void (*Enqueue) (void *, RF_DiskQueueData_t *, int); /* enqueue routine */ 93 RF_DiskQueueData_t *(*Dequeue) (void *); /* dequeue routine */ 94 RF_DiskQueueData_t *(*Peek) (void *); /* peek at head of queue */ 95 96 /* the rest are optional: they improve performance, but the driver 97 * will deal with it if they don't exist */ 98 int (*Promote) (void *, RF_StripeNum_t, RF_ReconUnitNum_t); /* promotes priority of 99 * tagged accesses */ 100 }; 101 102 struct RF_DiskQueue_s { 103 const RF_DiskQueueSW_t *qPtr; /* access point to queue functions */ 104 void *qHdr; /* queue header, of whatever type */ 105 RF_DECLARE_MUTEX(mutex) /* mutex locking data structures */ 106 RF_DECLARE_COND(cond) /* condition variable for 107 * synchronization */ 108 long numOutstanding; /* number of I/Os currently outstanding on 109 * disk */ 110 long maxOutstanding; /* max # of I/Os that can be outstanding on a 111 * disk (in-kernel only) */ 112 int curPriority; /* the priority of accs all that are currently 113 * outstanding */ 114 long queueLength; /* number of requests in queue */ 115 RF_DiskQueueFlags_t flags; /* terminate, locked */ 116 RF_Raid_t *raidPtr; /* associated array */ 117 dev_t dev; /* device number for kernel version */ 118 RF_SectorNum_t last_deq_sector; /* last sector number dequeued or 119 * dispatched */ 120 int col; /* debug only */ 121 struct raidcinfo *rf_cinfo; /* disks component info.. */ 122 }; 123 #define RF_DQ_LOCKED 0x02 /* no new accs allowed until queue is 124 * explicitly unlocked */ 125 126 /* macros setting & returning information about queues and requests */ 127 #define RF_QUEUE_EMPTY(_q) ((_q)->numOutstanding == 0) 128 #define RF_QUEUE_FULL(_q) ((_q)->numOutstanding == (_q)->maxOutstanding) 129 130 #define RF_LOCK_QUEUE_MUTEX(_q_,_wh_) RF_LOCK_MUTEX((_q_)->mutex) 131 #define RF_UNLOCK_QUEUE_MUTEX(_q_,_wh_) RF_UNLOCK_MUTEX((_q_)->mutex) 132 133 /* whether it is ok to dispatch a regular request */ 134 #define RF_OK_TO_DISPATCH(_q_,_r_) \ 135 (RF_QUEUE_EMPTY(_q_) || \ 136 (!RF_QUEUE_FULL(_q_) && ((_r_)->priority >= (_q_)->curPriority))) 137 138 int rf_ConfigureDiskQueueSystem(RF_ShutdownList_t **); 139 int rf_ConfigureDiskQueues(RF_ShutdownList_t **, RF_Raid_t *, RF_Config_t *); 140 void rf_DiskIOEnqueue(RF_DiskQueue_t *, RF_DiskQueueData_t *, int); 141 void rf_DiskIOComplete(RF_DiskQueue_t *, RF_DiskQueueData_t *, int); 142 int rf_DiskIOPromote(RF_DiskQueue_t *, RF_StripeNum_t, RF_ReconUnitNum_t); 143 RF_DiskQueueData_t *rf_CreateDiskQueueData(RF_IoType_t, RF_SectorNum_t, 144 RF_SectorCount_t , void *, 145 RF_StripeNum_t, RF_ReconUnitNum_t, 146 int (*wakeF) (void *, int), 147 void *, 148 RF_AccTraceEntry_t *, RF_Raid_t *, 149 RF_DiskQueueDataFlags_t, 150 void *, int); 151 void rf_FreeDiskQueueData(RF_DiskQueueData_t *); 152 int rf_ConfigureDiskQueue(RF_Raid_t *, RF_DiskQueue_t *, 153 RF_RowCol_t, const RF_DiskQueueSW_t *, 154 RF_SectorCount_t, dev_t, int, 155 RF_ShutdownList_t **, 156 RF_AllocListElem_t *); 157 158 #endif /* !_RF__RF_DISKQUEUE_H_ */ 159