diff options
Diffstat (limited to 'sys/dev/raidframe/rf_diskqueue.h')
| -rw-r--r-- | sys/dev/raidframe/rf_diskqueue.h | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/sys/dev/raidframe/rf_diskqueue.h b/sys/dev/raidframe/rf_diskqueue.h new file mode 100644 index 0000000..7b162b0 --- /dev/null +++ b/sys/dev/raidframe/rf_diskqueue.h @@ -0,0 +1,208 @@ +/* $FreeBSD$ */ +/* $NetBSD: rf_diskqueue.h,v 1.5 2000/02/13 04:53:57 oster Exp $ */ +/* + * Copyright (c) 1995 Carnegie-Mellon University. + * All rights reserved. + * + * Author: Mark Holland + * + * Permission to use, copy, modify and distribute this software and + * its documentation is hereby granted, provided that both the copyright + * notice and this permission notice appear in all copies of the + * software, derivative works or modified versions, and any portions + * thereof, and that both notices appear in supporting documentation. + * + * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" + * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND + * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. + * + * Carnegie Mellon requests users of this software to return to + * + * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU + * School of Computer Science + * Carnegie Mellon University + * Pittsburgh PA 15213-3890 + * + * any improvements or extensions that they make and grant Carnegie the + * rights to redistribute these changes. + */ + +/***************************************************************************************** + * + * rf_diskqueue.h -- header file for disk queues + * + * see comments in rf_diskqueue.c + * + ****************************************************************************************/ + + +#ifndef _RF__RF_DISKQUEUE_H_ +#define _RF__RF_DISKQUEUE_H_ + +#include <dev/raidframe/rf_threadstuff.h> +#include <dev/raidframe/rf_acctrace.h> +#include <dev/raidframe/rf_alloclist.h> +#include <dev/raidframe/rf_types.h> +#include <dev/raidframe/rf_etimer.h> + +#include <dev/raidframe/rf_bsd.h> + +#define RF_IO_NORMAL_PRIORITY 1 +#define RF_IO_LOW_PRIORITY 0 + +/* the data held by a disk queue entry */ +struct RF_DiskQueueData_s { + RF_SectorNum_t sectorOffset; /* sector offset into the disk */ + RF_SectorCount_t numSector; /* number of sectors to read/write */ + RF_IoType_t type; /* read/write/nop */ + caddr_t buf; /* buffer pointer */ + RF_StripeNum_t parityStripeID; /* the RAID parity stripe ID this + * access is for */ + RF_ReconUnitNum_t which_ru; /* which RU within this parity stripe */ + int priority; /* the priority of this request */ + int (*CompleteFunc) (void *, int); /* function to be called upon + * completion */ + int (*AuxFunc) (void *,...); /* function called upon + * completion of the first I/O + * of a Read_Op_Write pair */ + void *argument; /* argument to be passed to CompleteFunc */ + RF_Raid_t *raidPtr; /* needed for simulation */ + RF_AccTraceEntry_t *tracerec; /* perf mon only */ + RF_Etimer_t qtime; /* perf mon only - time request is in queue */ + long entryTime; + RF_DiskQueueData_t *next; + RF_DiskQueueData_t *prev; + caddr_t buf2; /* for read-op-write */ + dev_t dev; /* the device number for in-kernel version */ + RF_DiskQueue_t *queue; /* the disk queue to which this req is + * targeted */ + RF_DiskQueueDataFlags_t flags; /* flags controlling operation */ + + struct proc *b_proc; /* the b_proc from the original bp passed into + * the driver for this I/O */ + /* XXX Should this be changed to the opaque + * RF_Thread_t ? */ + RF_Buf_t bp; /* a bp to use to get this I/O done */ +}; +#define RF_LOCK_DISK_QUEUE 0x01 +#define RF_UNLOCK_DISK_QUEUE 0x02 + +/* note: "Create" returns type-specific queue header pointer cast to (void *) */ +struct RF_DiskQueueSW_s { + RF_DiskQueueType_t queueType; + void *(*Create) (RF_SectorCount_t, RF_AllocListElem_t *, RF_ShutdownList_t **); /* creation routine -- + * one call per queue in + * system */ + void (*Enqueue) (void *, RF_DiskQueueData_t *, int); /* enqueue routine */ + RF_DiskQueueData_t *(*Dequeue) (void *); /* dequeue routine */ + RF_DiskQueueData_t *(*Peek) (void *); /* peek at head of queue */ + + /* the rest are optional: they improve performance, but the driver + * will deal with it if they don't exist */ + int (*Promote) (void *, RF_StripeNum_t, RF_ReconUnitNum_t); /* promotes priority of + * tagged accesses */ +}; + +struct RF_DiskQueue_s { + RF_DiskQueueSW_t *qPtr; /* access point to queue functions */ + void *qHdr; /* queue header, of whatever type */ + RF_DECLARE_MUTEX(mutex) /* mutex locking data structures */ + RF_DECLARE_COND(cond) /* condition variable for + * synchronization */ + long numOutstanding; /* number of I/Os currently outstanding on + * disk */ + long maxOutstanding; /* max # of I/Os that can be outstanding on a + * disk (in-kernel only) */ + int curPriority; /* the priority of accs all that are currently + * outstanding */ + long queueLength; /* number of requests in queue */ + RF_DiskQueueData_t *nextLockingOp; /* a locking op that has + * arrived at the head of the + * queue & is waiting for + * drainage */ + RF_DiskQueueData_t *unlockingOp; /* used at user level to + * communicate unlocking op + * b/w user (or dag exec) & + * disk threads */ + int numWaiting; /* number of threads waiting on this variable. + * user-level only */ + RF_DiskQueueFlags_t flags; /* terminate, locked */ + RF_Raid_t *raidPtr; /* associated array */ + dev_t dev; /* device number for kernel version */ + RF_SectorNum_t last_deq_sector; /* last sector number dequeued or + * dispatched */ + int row, col; /* debug only */ + struct raidcinfo *rf_cinfo; /* disks component info.. */ +}; +#define RF_DQ_LOCKED 0x02 /* no new accs allowed until queue is + * explicitly unlocked */ + +/* macros setting & returning information about queues and requests */ +#define RF_QUEUE_LOCKED(_q) ((_q)->flags & RF_DQ_LOCKED) +#define RF_QUEUE_EMPTY(_q) (((_q)->numOutstanding == 0) && ((_q)->nextLockingOp == NULL) && !RF_QUEUE_LOCKED(_q)) +#define RF_QUEUE_FULL(_q) ((_q)->numOutstanding == (_q)->maxOutstanding) + +#define RF_LOCK_QUEUE(_q) (_q)->flags |= RF_DQ_LOCKED +#define RF_UNLOCK_QUEUE(_q) (_q)->flags &= ~RF_DQ_LOCKED + +#define RF_LOCK_QUEUE_MUTEX(_q_,_wh_) RF_LOCK_MUTEX((_q_)->mutex) +#define RF_UNLOCK_QUEUE_MUTEX(_q_,_wh_) RF_UNLOCK_MUTEX((_q_)->mutex) + +#define RF_LOCKING_REQ(_r) ((_r)->flags & RF_LOCK_DISK_QUEUE) +#define RF_UNLOCKING_REQ(_r) ((_r)->flags & RF_UNLOCK_DISK_QUEUE) + +/* whether it is ok to dispatch a regular request */ +#define RF_OK_TO_DISPATCH(_q_,_r_) \ + (RF_QUEUE_EMPTY(_q_) || \ + (!RF_QUEUE_FULL(_q_) && ((_r_)->priority >= (_q_)->curPriority))) + +int rf_ConfigureDiskQueueSystem(RF_ShutdownList_t ** listp); + +void rf_TerminateDiskQueues(RF_Raid_t * raidPtr); + +int +rf_ConfigureDiskQueues(RF_ShutdownList_t ** listp, RF_Raid_t * raidPtr, + RF_Config_t * cfgPtr); + +void rf_DiskIOEnqueue(RF_DiskQueue_t * queue, RF_DiskQueueData_t * req, int pri); + + +void rf_DiskIOComplete(RF_DiskQueue_t * queue, RF_DiskQueueData_t * req, int status); + +int +rf_DiskIOPromote(RF_DiskQueue_t * queue, RF_StripeNum_t parityStripeID, + RF_ReconUnitNum_t which_ru); + +RF_DiskQueueData_t * +rf_CreateDiskQueueData(RF_IoType_t typ, RF_SectorNum_t ssect, + RF_SectorCount_t nsect, caddr_t buf, + RF_StripeNum_t parityStripeID, + RF_ReconUnitNum_t which_ru, + int (*wakeF) (void *, int), + void *arg, RF_DiskQueueData_t * next, + RF_AccTraceEntry_t * tracerec, + void *raidPtr, RF_DiskQueueDataFlags_t flags, + void *kb_proc); + +RF_DiskQueueData_t * +rf_CreateDiskQueueDataFull(RF_IoType_t typ, RF_SectorNum_t ssect, + RF_SectorCount_t nsect, caddr_t buf, + RF_StripeNum_t parityStripeID, + RF_ReconUnitNum_t which_ru, + int (*wakeF) (void *, int), + void *arg, RF_DiskQueueData_t * next, + RF_AccTraceEntry_t * tracerec, + int priority, int (*AuxFunc) (void *,...), + caddr_t buf2, void *raidPtr, + RF_DiskQueueDataFlags_t flags, void *kb_proc); + +void +rf_FreeDiskQueueData(RF_DiskQueueData_t * p); + +int +rf_ConfigureDiskQueue(RF_Raid_t *, RF_DiskQueue_t *, RF_RowCol_t, + RF_RowCol_t, RF_DiskQueueSW_t *, + RF_SectorCount_t, dev_t, int, + RF_ShutdownList_t **, + RF_AllocListElem_t *); +#endif /* !_RF__RF_DISKQUEUE_H_ */ |
