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NetBSD/sys/dev/raidframe/rf_diskqueue.h

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/* $NetBSD: rf_diskqueue.h,v 1.1 1998/11/13 04:20:29 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
*
****************************************************************************************/
/*
*
* :
*
* Log: rf_diskqueue.h,v
* Revision 1.31 1996/08/07 21:08:49 jimz
* b_proc -> kb_proc (IRIX complained)
*
* Revision 1.30 1996/06/18 20:53:11 jimz
* fix up disk queueing (remove configure routine,
* add shutdown list arg to create routines)
*
* Revision 1.29 1996/06/13 20:38:19 jimz
* fix queue type in DiskQueueData
*
* Revision 1.28 1996/06/10 11:55:47 jimz
* Straightened out some per-array/not-per-array distinctions, fixed
* a couple bugs related to confusion. Added shutdown lists. Removed
* layout shutdown function (now subsumed by shutdown lists).
*
* Revision 1.27 1996/06/07 22:26:27 jimz
* type-ify which_ru (RF_ReconUnitNum_t)
*
* Revision 1.26 1996/06/07 21:33:04 jimz
* begin using consistent types for sector numbers,
* stripe numbers, row+col numbers, recon unit numbers
*
* Revision 1.25 1996/06/06 17:29:12 jimz
* track arm position of last I/O dequeued
*
* Revision 1.24 1996/06/05 18:06:02 jimz
* Major code cleanup. The Great Renaming is now done.
* Better modularity. Better typing. Fixed a bunch of
* synchronization bugs. Made a lot of global stuff
* per-desc or per-array. Removed dead code.
*
* Revision 1.23 1996/06/02 17:31:48 jimz
* Moved a lot of global stuff into array structure, where it belongs.
* Fixed up paritylogging, pss modules in this manner. Some general
* code cleanup. Removed lots of dead code, some dead files.
*
* Revision 1.22 1996/05/30 23:22:16 jimz
* bugfixes of serialization, timing problems
* more cleanup
*
* Revision 1.21 1996/05/30 11:29:41 jimz
* Numerous bug fixes. Stripe lock release code disagreed with the taking code
* about when stripes should be locked (I made it consistent: no parity, no lock)
* There was a lot of extra serialization of I/Os which I've removed- a lot of
* it was to calculate values for the cache code, which is no longer with us.
* More types, function, macro cleanup. Added code to properly quiesce the array
* on shutdown. Made a lot of stuff array-specific which was (bogusly) general
* before. Fixed memory allocation, freeing bugs.
*
* Revision 1.20 1996/05/24 22:17:04 jimz
* continue code + namespace cleanup
* typed a bunch of flags
*
* Revision 1.19 1996/05/24 01:59:45 jimz
* another checkpoint in code cleanup for release
* time to sync kernel tree
*
* Revision 1.18 1996/05/23 21:46:35 jimz
* checkpoint in code cleanup (release prep)
* lots of types, function names have been fixed
*
* Revision 1.17 1996/05/23 00:33:23 jimz
* code cleanup: move all debug decls to rf_options.c, all extern
* debug decls to rf_options.h, all debug vars preceded by rf_
*
* Revision 1.16 1996/05/18 19:51:34 jimz
* major code cleanup- fix syntax, make some types consistent,
* add prototypes, clean out dead code, et cetera
*
* Revision 1.15 1996/05/10 19:39:31 jimz
* add prev pointer to DiskQueueData
*
* Revision 1.14 1996/05/10 16:24:04 jimz
* mark old defines as deprecated, add RF_ defines
*
* Revision 1.13 1995/12/01 15:59:04 root
* added copyright info
*
* Revision 1.12 1995/11/07 16:26:44 wvcii
* added Peek() function to diskqueuesw
*
* Revision 1.11 1995/10/05 02:33:15 jimz
* made queue lens longs (less instructions to read :-)
*
* Revision 1.10 1995/10/04 07:07:07 wvcii
* queue->numOutstanding now valid for user & sim
* user tested & verified, sim untested
*
* Revision 1.9 1995/09/12 00:21:37 wvcii
* added support for tracing disk queue time
*
* Revision 1.8 95/04/24 13:25:51 holland
* rewrite to move disk queues, recon, & atomic RMW to kernel
*
* Revision 1.6.10.2 1995/04/03 20:13:56 holland
* added numOutstanding and maxOutstanding to support moving
* disk queues into kernel code
*
* Revision 1.6.10.1 1995/04/03 20:03:56 holland
* initial checkin on branch
*
* Revision 1.6 1995/03/03 18:34:33 rachad
* Simulator mechanism added
*
* Revision 1.5 1995/03/01 20:25:48 holland
* kernelization changes
*
* Revision 1.4 1995/02/03 22:31:36 holland
* many changes related to kernelization
*
* Revision 1.3 1995/02/01 14:25:19 holland
* began changes for kernelization:
* changed all instances of mutex_t and cond_t to DECLARE macros
* converted configuration code to use config structure
*
* Revision 1.2 1994/11/29 20:36:02 danner
* Added symbolic constants for io_type (e.g,IO_TYPE_READ)
* and support for READ_OP_WRITE
*
*/
#ifndef _RF__RF_DISKQUEUE_H_
#define _RF__RF_DISKQUEUE_H_
#include "rf_threadstuff.h"
#include "rf_acctrace.h"
#include "rf_alloclist.h"
#include "rf_types.h"
#include "rf_etimer.h"
#if defined(__NetBSD__) && defined(_KERNEL)
#include "rf_netbsd.h"
#endif
#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 */
#ifdef SIMULATE
RF_Owner_t owner; /* which task is responsible for this request */
#endif /* SIMULATE */
void *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 */
#ifdef KERNEL
struct proc *b_proc; /* the b_proc from the original bp passed into the driver for this I/O */
struct buf *bp; /* a bp to use to get this I/O done */
#endif /* KERNEL */
};
#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 */
#if defined(__NetBSD__) && defined(_KERNEL)
struct raidcinfo *rf_cinfo; /* disks component info.. */
#endif
};
#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);
#if !defined(KERNEL) && !defined(SIMULATE)
void rf_BroadcastOnQueue(RF_DiskQueue_t *queue);
#endif /* !KERNEL && !SIMULATE */
#ifndef KERNEL
RF_DiskQueueData_t *rf_DiskIODequeue(RF_DiskQueue_t *queue);
#else /* !KERNEL */
void rf_DiskIOComplete(RF_DiskQueue_t *queue, RF_DiskQueueData_t *req, int status);
#endif /* !KERNEL */
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);
#endif /* !_RF__RF_DISKQUEUE_H_ */
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