311 lines
13 KiB
C
311 lines
13 KiB
C
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/* $NetBSD: rf_diskqueue.h,v 1.1 1998/11/13 04:20:29 oster Exp $ */
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/*
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* Copyright (c) 1995 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Author: Mark Holland
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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/*****************************************************************************************
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*
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* rf_diskqueue.h -- header file for disk queues
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*
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* see comments in rf_diskqueue.c
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*
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****************************************************************************************/
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/*
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*
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* :
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*
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* Log: rf_diskqueue.h,v
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* Revision 1.31 1996/08/07 21:08:49 jimz
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* b_proc -> kb_proc (IRIX complained)
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*
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* Revision 1.30 1996/06/18 20:53:11 jimz
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* fix up disk queueing (remove configure routine,
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* add shutdown list arg to create routines)
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*
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* Revision 1.29 1996/06/13 20:38:19 jimz
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* fix queue type in DiskQueueData
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*
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* Revision 1.28 1996/06/10 11:55:47 jimz
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* Straightened out some per-array/not-per-array distinctions, fixed
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* a couple bugs related to confusion. Added shutdown lists. Removed
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* layout shutdown function (now subsumed by shutdown lists).
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*
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* Revision 1.27 1996/06/07 22:26:27 jimz
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* type-ify which_ru (RF_ReconUnitNum_t)
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*
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* Revision 1.26 1996/06/07 21:33:04 jimz
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* begin using consistent types for sector numbers,
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* stripe numbers, row+col numbers, recon unit numbers
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*
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* Revision 1.25 1996/06/06 17:29:12 jimz
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* track arm position of last I/O dequeued
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*
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* Revision 1.24 1996/06/05 18:06:02 jimz
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* Major code cleanup. The Great Renaming is now done.
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* Better modularity. Better typing. Fixed a bunch of
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* synchronization bugs. Made a lot of global stuff
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* per-desc or per-array. Removed dead code.
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*
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* Revision 1.23 1996/06/02 17:31:48 jimz
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* Moved a lot of global stuff into array structure, where it belongs.
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* Fixed up paritylogging, pss modules in this manner. Some general
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* code cleanup. Removed lots of dead code, some dead files.
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*
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* Revision 1.22 1996/05/30 23:22:16 jimz
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* bugfixes of serialization, timing problems
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* more cleanup
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*
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* Revision 1.21 1996/05/30 11:29:41 jimz
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* Numerous bug fixes. Stripe lock release code disagreed with the taking code
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* about when stripes should be locked (I made it consistent: no parity, no lock)
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* There was a lot of extra serialization of I/Os which I've removed- a lot of
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* it was to calculate values for the cache code, which is no longer with us.
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* More types, function, macro cleanup. Added code to properly quiesce the array
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* on shutdown. Made a lot of stuff array-specific which was (bogusly) general
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* before. Fixed memory allocation, freeing bugs.
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*
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* Revision 1.20 1996/05/24 22:17:04 jimz
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* continue code + namespace cleanup
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* typed a bunch of flags
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*
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* Revision 1.19 1996/05/24 01:59:45 jimz
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* another checkpoint in code cleanup for release
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* time to sync kernel tree
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*
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* Revision 1.18 1996/05/23 21:46:35 jimz
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* checkpoint in code cleanup (release prep)
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* lots of types, function names have been fixed
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*
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* Revision 1.17 1996/05/23 00:33:23 jimz
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* code cleanup: move all debug decls to rf_options.c, all extern
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* debug decls to rf_options.h, all debug vars preceded by rf_
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*
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* Revision 1.16 1996/05/18 19:51:34 jimz
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* major code cleanup- fix syntax, make some types consistent,
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* add prototypes, clean out dead code, et cetera
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*
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* Revision 1.15 1996/05/10 19:39:31 jimz
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* add prev pointer to DiskQueueData
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*
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* Revision 1.14 1996/05/10 16:24:04 jimz
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* mark old defines as deprecated, add RF_ defines
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*
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* Revision 1.13 1995/12/01 15:59:04 root
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* added copyright info
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*
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* Revision 1.12 1995/11/07 16:26:44 wvcii
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* added Peek() function to diskqueuesw
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*
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* Revision 1.11 1995/10/05 02:33:15 jimz
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* made queue lens longs (less instructions to read :-)
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*
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* Revision 1.10 1995/10/04 07:07:07 wvcii
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* queue->numOutstanding now valid for user & sim
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* user tested & verified, sim untested
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*
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* Revision 1.9 1995/09/12 00:21:37 wvcii
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* added support for tracing disk queue time
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*
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* Revision 1.8 95/04/24 13:25:51 holland
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* rewrite to move disk queues, recon, & atomic RMW to kernel
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*
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* Revision 1.6.10.2 1995/04/03 20:13:56 holland
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* added numOutstanding and maxOutstanding to support moving
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* disk queues into kernel code
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*
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* Revision 1.6.10.1 1995/04/03 20:03:56 holland
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* initial checkin on branch
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*
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* Revision 1.6 1995/03/03 18:34:33 rachad
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* Simulator mechanism added
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*
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* Revision 1.5 1995/03/01 20:25:48 holland
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* kernelization changes
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*
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* Revision 1.4 1995/02/03 22:31:36 holland
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* many changes related to kernelization
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*
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* Revision 1.3 1995/02/01 14:25:19 holland
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* began changes for kernelization:
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* changed all instances of mutex_t and cond_t to DECLARE macros
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* converted configuration code to use config structure
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*
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* Revision 1.2 1994/11/29 20:36:02 danner
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* Added symbolic constants for io_type (e.g,IO_TYPE_READ)
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* and support for READ_OP_WRITE
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*
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*/
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#ifndef _RF__RF_DISKQUEUE_H_
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#define _RF__RF_DISKQUEUE_H_
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#include "rf_threadstuff.h"
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#include "rf_acctrace.h"
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#include "rf_alloclist.h"
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#include "rf_types.h"
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#include "rf_etimer.h"
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#if defined(__NetBSD__) && defined(_KERNEL)
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#include "rf_netbsd.h"
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#endif
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#define RF_IO_NORMAL_PRIORITY 1
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#define RF_IO_LOW_PRIORITY 0
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/* the data held by a disk queue entry */
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struct RF_DiskQueueData_s {
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RF_SectorNum_t sectorOffset; /* sector offset into the disk */
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RF_SectorCount_t numSector; /* number of sectors to read/write */
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RF_IoType_t type; /* read/write/nop */
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caddr_t buf; /* buffer pointer */
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RF_StripeNum_t parityStripeID; /* the RAID parity stripe ID this access is for */
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RF_ReconUnitNum_t which_ru; /* which RU within this parity stripe */
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int priority; /* the priority of this request */
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int (*CompleteFunc)(void *,int);/* function to be called upon completion */
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int (*AuxFunc)(void *,...); /* function called upon completion of the first I/O of a Read_Op_Write pair*/
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void *argument; /* argument to be passed to CompleteFunc */
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#ifdef SIMULATE
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RF_Owner_t owner; /* which task is responsible for this request */
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#endif /* SIMULATE */
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void *raidPtr; /* needed for simulation */
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RF_AccTraceEntry_t *tracerec; /* perf mon only */
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RF_Etimer_t qtime; /* perf mon only - time request is in queue */
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long entryTime;
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RF_DiskQueueData_t *next;
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RF_DiskQueueData_t *prev;
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caddr_t buf2; /* for read-op-write */
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dev_t dev; /* the device number for in-kernel version */
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RF_DiskQueue_t *queue; /* the disk queue to which this req is targeted */
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RF_DiskQueueDataFlags_t flags; /* flags controlling operation */
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#ifdef KERNEL
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struct proc *b_proc; /* the b_proc from the original bp passed into the driver for this I/O */
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struct buf *bp; /* a bp to use to get this I/O done */
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#endif /* KERNEL */
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};
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#define RF_LOCK_DISK_QUEUE 0x01
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#define RF_UNLOCK_DISK_QUEUE 0x02
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/* note: "Create" returns type-specific queue header pointer cast to (void *) */
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struct RF_DiskQueueSW_s {
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RF_DiskQueueType_t queueType;
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void *(*Create)(RF_SectorCount_t, RF_AllocListElem_t *, RF_ShutdownList_t **); /* creation routine -- one call per queue in system */
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void (*Enqueue)(void *,RF_DiskQueueData_t * ,int); /* enqueue routine */
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RF_DiskQueueData_t *(*Dequeue)(void *); /* dequeue routine */
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RF_DiskQueueData_t *(*Peek)(void *); /* peek at head of queue */
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/* the rest are optional: they improve performance, but the driver will deal with it if they don't exist */
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int (*Promote)(void *, RF_StripeNum_t, RF_ReconUnitNum_t); /* promotes priority of tagged accesses */
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};
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struct RF_DiskQueue_s {
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RF_DiskQueueSW_t *qPtr; /* access point to queue functions */
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void *qHdr; /* queue header, of whatever type */
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RF_DECLARE_MUTEX(mutex) /* mutex locking data structures */
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RF_DECLARE_COND(cond) /* condition variable for synchronization */
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long numOutstanding; /* number of I/Os currently outstanding on disk */
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long maxOutstanding; /* max # of I/Os that can be outstanding on a disk (in-kernel only) */
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int curPriority; /* the priority of accs all that are currently outstanding */
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long queueLength; /* number of requests in queue */
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RF_DiskQueueData_t *nextLockingOp; /* a locking op that has arrived at the head of the queue & is waiting for drainage */
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RF_DiskQueueData_t *unlockingOp; /* used at user level to communicate unlocking op b/w user (or dag exec) & disk threads */
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int numWaiting; /* number of threads waiting on this variable. user-level only */
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RF_DiskQueueFlags_t flags; /* terminate, locked */
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RF_Raid_t *raidPtr; /* associated array */
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dev_t dev; /* device number for kernel version */
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RF_SectorNum_t last_deq_sector; /* last sector number dequeued or dispatched */
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int row, col; /* debug only */
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#if defined(__NetBSD__) && defined(_KERNEL)
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struct raidcinfo *rf_cinfo; /* disks component info.. */
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#endif
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};
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#define RF_DQ_LOCKED 0x02 /* no new accs allowed until queue is explicitly unlocked */
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/* macros setting & returning information about queues and requests */
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#define RF_QUEUE_LOCKED(_q) ((_q)->flags & RF_DQ_LOCKED)
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#define RF_QUEUE_EMPTY(_q) (((_q)->numOutstanding == 0) && ((_q)->nextLockingOp == NULL) && !RF_QUEUE_LOCKED(_q))
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#define RF_QUEUE_FULL(_q) ((_q)->numOutstanding == (_q)->maxOutstanding)
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#define RF_LOCK_QUEUE(_q) (_q)->flags |= RF_DQ_LOCKED
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#define RF_UNLOCK_QUEUE(_q) (_q)->flags &= ~RF_DQ_LOCKED
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#define RF_LOCK_QUEUE_MUTEX(_q_,_wh_) RF_LOCK_MUTEX((_q_)->mutex)
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#define RF_UNLOCK_QUEUE_MUTEX(_q_,_wh_) RF_UNLOCK_MUTEX((_q_)->mutex)
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#define RF_LOCKING_REQ(_r) ((_r)->flags & RF_LOCK_DISK_QUEUE)
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#define RF_UNLOCKING_REQ(_r) ((_r)->flags & RF_UNLOCK_DISK_QUEUE)
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/* whether it is ok to dispatch a regular request */
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#define RF_OK_TO_DISPATCH(_q_,_r_) \
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(RF_QUEUE_EMPTY(_q_) || \
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(!RF_QUEUE_FULL(_q_) && ((_r_)->priority >= (_q_)->curPriority)))
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int rf_ConfigureDiskQueueSystem(RF_ShutdownList_t **listp);
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void rf_TerminateDiskQueues(RF_Raid_t *raidPtr);
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int rf_ConfigureDiskQueues(RF_ShutdownList_t **listp, RF_Raid_t *raidPtr,
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RF_Config_t *cfgPtr);
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void rf_DiskIOEnqueue(RF_DiskQueue_t *queue, RF_DiskQueueData_t *req, int pri);
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#if !defined(KERNEL) && !defined(SIMULATE)
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void rf_BroadcastOnQueue(RF_DiskQueue_t *queue);
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#endif /* !KERNEL && !SIMULATE */
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#ifndef KERNEL
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RF_DiskQueueData_t *rf_DiskIODequeue(RF_DiskQueue_t *queue);
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#else /* !KERNEL */
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void rf_DiskIOComplete(RF_DiskQueue_t *queue, RF_DiskQueueData_t *req, int status);
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#endif /* !KERNEL */
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int rf_DiskIOPromote(RF_DiskQueue_t *queue, RF_StripeNum_t parityStripeID,
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RF_ReconUnitNum_t which_ru);
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RF_DiskQueueData_t *rf_CreateDiskQueueData(RF_IoType_t typ,
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RF_SectorNum_t ssect, RF_SectorCount_t nsect, caddr_t buf,
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RF_StripeNum_t parityStripeID, RF_ReconUnitNum_t which_ru,
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int (*wakeF)(void *, int),
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void *arg, RF_DiskQueueData_t *next, RF_AccTraceEntry_t *tracerec,
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void *raidPtr, RF_DiskQueueDataFlags_t flags, void *kb_proc);
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RF_DiskQueueData_t *rf_CreateDiskQueueDataFull(RF_IoType_t typ,
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RF_SectorNum_t ssect, RF_SectorCount_t nsect, caddr_t buf,
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RF_StripeNum_t parityStripeID, RF_ReconUnitNum_t which_ru,
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int (*wakeF)(void *, int),
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void *arg, RF_DiskQueueData_t *next, RF_AccTraceEntry_t *tracerec,
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int priority, int (*AuxFunc)(void *,...), caddr_t buf2,
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void *raidPtr, RF_DiskQueueDataFlags_t flags, void *kb_proc);
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void rf_FreeDiskQueueData(RF_DiskQueueData_t *p);
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#endif /* !_RF__RF_DISKQUEUE_H_ */
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