555 lines
17 KiB
C
555 lines
17 KiB
C
/* $NetBSD: rf_diskqueue.c,v 1.21 2002/09/17 02:55:12 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.c -- higher-level disk queue code
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*
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* the routines here are a generic wrapper around the actual queueing
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* routines. The code here implements thread scheduling, synchronization,
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* and locking ops (see below) on top of the lower-level queueing code.
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*
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* to support atomic RMW, we implement "locking operations". When a
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* locking op is dispatched to the lower levels of the driver, the
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* queue is locked, and no further I/Os are dispatched until the queue
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* receives & completes a corresponding "unlocking operation". This
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* code relies on the higher layers to guarantee that a locking op
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* will always be eventually followed by an unlocking op. The model
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* is that the higher layers are structured so locking and unlocking
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* ops occur in pairs, i.e. an unlocking op cannot be generated until
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* after a locking op reports completion. There is no good way to
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* check to see that an unlocking op "corresponds" to the op that
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* currently has the queue locked, so we make no such attempt. Since
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* by definition there can be only one locking op outstanding on a
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* disk, this should not be a problem.
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*
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* In the kernel, we allow multiple I/Os to be concurrently dispatched
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* to the disk driver. In order to support locking ops in this
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* environment, when we decide to do a locking op, we stop dispatching
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* new I/Os and wait until all dispatched I/Os have completed before
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* dispatching the locking op.
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*
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* Unfortunately, the code is different in the 3 different operating
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* states (user level, kernel, simulator). In the kernel, I/O is
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* non-blocking, and we have no disk threads to dispatch for us.
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* Therefore, we have to dispatch new I/Os to the scsi driver at the
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* time of enqueue, and also at the time of completion. At user
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* level, I/O is blocking, and so only the disk threads may dispatch
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* I/Os. Thus at user level, all we can do at enqueue time is enqueue
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* and wake up the disk thread to do the dispatch.
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*
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****************************************************************************/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: rf_diskqueue.c,v 1.21 2002/09/17 02:55:12 oster Exp $");
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#include <dev/raidframe/raidframevar.h>
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#include "rf_threadstuff.h"
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#include "rf_raid.h"
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#include "rf_diskqueue.h"
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#include "rf_alloclist.h"
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#include "rf_acctrace.h"
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#include "rf_etimer.h"
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#include "rf_general.h"
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#include "rf_freelist.h"
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#include "rf_debugprint.h"
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#include "rf_shutdown.h"
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#include "rf_cvscan.h"
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#include "rf_sstf.h"
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#include "rf_fifo.h"
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#include "rf_kintf.h"
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static int init_dqd(RF_DiskQueueData_t *);
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static void clean_dqd(RF_DiskQueueData_t *);
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static void rf_ShutdownDiskQueueSystem(void *);
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#ifndef RF_DEBUG_DISKQUEUE
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#define RF_DEBUG_DISKQUEUE 0
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#endif
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#if RF_DEBUG_DISKQUEUE
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#define Dprintf1(s,a) if (rf_queueDebug) rf_debug_printf(s,(void *)((unsigned long)a),NULL,NULL,NULL,NULL,NULL,NULL,NULL)
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#define Dprintf2(s,a,b) if (rf_queueDebug) rf_debug_printf(s,(void *)((unsigned long)a),(void *)((unsigned long)b),NULL,NULL,NULL,NULL,NULL,NULL)
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#define Dprintf3(s,a,b,c) if (rf_queueDebug) rf_debug_printf(s,(void *)((unsigned long)a),(void *)((unsigned long)b),(void *)((unsigned long)c),NULL,NULL,NULL,NULL,NULL)
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#else
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#define Dprintf1(s,a)
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#define Dprintf2(s,a,b)
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#define Dprintf3(s,a,b,c)
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#endif
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/*****************************************************************************
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*
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* the disk queue switch defines all the functions used in the
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* different queueing disciplines queue ID, init routine, enqueue
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* routine, dequeue routine
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*
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****************************************************************************/
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static RF_DiskQueueSW_t diskqueuesw[] = {
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{"fifo", /* FIFO */
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rf_FifoCreate,
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rf_FifoEnqueue,
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rf_FifoDequeue,
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rf_FifoPeek,
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rf_FifoPromote},
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{"cvscan", /* cvscan */
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rf_CvscanCreate,
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rf_CvscanEnqueue,
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rf_CvscanDequeue,
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rf_CvscanPeek,
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rf_CvscanPromote},
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{"sstf", /* shortest seek time first */
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rf_SstfCreate,
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rf_SstfEnqueue,
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rf_SstfDequeue,
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rf_SstfPeek,
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rf_SstfPromote},
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{"scan", /* SCAN (two-way elevator) */
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rf_ScanCreate,
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rf_SstfEnqueue,
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rf_ScanDequeue,
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rf_ScanPeek,
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rf_SstfPromote},
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{"cscan", /* CSCAN (one-way elevator) */
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rf_CscanCreate,
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rf_SstfEnqueue,
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rf_CscanDequeue,
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rf_CscanPeek,
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rf_SstfPromote},
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};
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#define NUM_DISK_QUEUE_TYPES (sizeof(diskqueuesw)/sizeof(RF_DiskQueueSW_t))
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static RF_FreeList_t *rf_dqd_freelist;
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#define RF_MAX_FREE_DQD 256
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#define RF_DQD_INC 16
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#define RF_DQD_INITIAL 64
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#include <sys/buf.h>
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static int
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init_dqd(dqd)
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RF_DiskQueueData_t *dqd;
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{
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dqd->bp = (struct buf *) malloc(sizeof(struct buf),
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M_RAIDFRAME, M_NOWAIT);
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if (dqd->bp == NULL) {
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return (ENOMEM);
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}
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memset(dqd->bp, 0, sizeof(struct buf)); /* if you don't do it, nobody
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* else will.. */
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return (0);
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}
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static void
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clean_dqd(dqd)
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RF_DiskQueueData_t *dqd;
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{
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free(dqd->bp, M_RAIDFRAME);
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}
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/* configures a single disk queue */
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int
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rf_ConfigureDiskQueue(
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RF_Raid_t * raidPtr,
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RF_DiskQueue_t * diskqueue,
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RF_RowCol_t r, /* row & col -- debug only. BZZT not any
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* more... */
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RF_RowCol_t c,
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RF_DiskQueueSW_t * p,
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RF_SectorCount_t sectPerDisk,
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dev_t dev,
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int maxOutstanding,
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RF_ShutdownList_t ** listp,
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RF_AllocListElem_t * clList)
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{
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int rc;
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diskqueue->row = r;
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diskqueue->col = c;
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diskqueue->qPtr = p;
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diskqueue->qHdr = (p->Create) (sectPerDisk, clList, listp);
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diskqueue->dev = dev;
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diskqueue->numOutstanding = 0;
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diskqueue->queueLength = 0;
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diskqueue->maxOutstanding = maxOutstanding;
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diskqueue->curPriority = RF_IO_NORMAL_PRIORITY;
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diskqueue->nextLockingOp = NULL;
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diskqueue->numWaiting = 0;
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diskqueue->flags = 0;
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diskqueue->raidPtr = raidPtr;
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diskqueue->rf_cinfo = &raidPtr->raid_cinfo[r][c];
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rc = rf_create_managed_mutex(listp, &diskqueue->mutex);
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if (rc) {
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rf_print_unable_to_init_mutex(__FILE__, __LINE__, rc);
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return (rc);
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}
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rc = rf_create_managed_cond(listp, &diskqueue->cond);
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if (rc) {
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rf_print_unable_to_init_cond(__FILE__, __LINE__, rc);
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return (rc);
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}
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return (0);
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}
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static void
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rf_ShutdownDiskQueueSystem(ignored)
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void *ignored;
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{
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RF_FREELIST_DESTROY_CLEAN(rf_dqd_freelist, next, (RF_DiskQueueData_t *), clean_dqd);
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}
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int
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rf_ConfigureDiskQueueSystem(listp)
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RF_ShutdownList_t **listp;
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{
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int rc;
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RF_FREELIST_CREATE(rf_dqd_freelist, RF_MAX_FREE_DQD,
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RF_DQD_INC, sizeof(RF_DiskQueueData_t));
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if (rf_dqd_freelist == NULL)
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return (ENOMEM);
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rc = rf_ShutdownCreate(listp, rf_ShutdownDiskQueueSystem, NULL);
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if (rc) {
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rf_print_unable_to_add_shutdown( __FILE__, __LINE__, rc);
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rf_ShutdownDiskQueueSystem(NULL);
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return (rc);
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}
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RF_FREELIST_PRIME_INIT(rf_dqd_freelist, RF_DQD_INITIAL, next,
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(RF_DiskQueueData_t *), init_dqd);
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return (0);
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}
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int
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rf_ConfigureDiskQueues(
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RF_ShutdownList_t ** listp,
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RF_Raid_t * raidPtr,
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RF_Config_t * cfgPtr)
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{
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RF_DiskQueue_t **diskQueues, *spareQueues;
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RF_DiskQueueSW_t *p;
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RF_RowCol_t r, c;
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int rc, i;
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raidPtr->maxQueueDepth = cfgPtr->maxOutstandingDiskReqs;
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for (p = NULL, i = 0; i < NUM_DISK_QUEUE_TYPES; i++) {
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if (!strcmp(diskqueuesw[i].queueType, cfgPtr->diskQueueType)) {
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p = &diskqueuesw[i];
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break;
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}
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}
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if (p == NULL) {
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RF_ERRORMSG2("Unknown queue type \"%s\". Using %s\n", cfgPtr->diskQueueType, diskqueuesw[0].queueType);
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p = &diskqueuesw[0];
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}
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raidPtr->qType = p;
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RF_CallocAndAdd(diskQueues, raidPtr->numRow, sizeof(RF_DiskQueue_t *), (RF_DiskQueue_t **), raidPtr->cleanupList);
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if (diskQueues == NULL) {
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return (ENOMEM);
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}
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raidPtr->Queues = diskQueues;
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for (r = 0; r < raidPtr->numRow; r++) {
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RF_CallocAndAdd(diskQueues[r], raidPtr->numCol +
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((r == 0) ? RF_MAXSPARE : 0),
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sizeof(RF_DiskQueue_t), (RF_DiskQueue_t *),
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raidPtr->cleanupList);
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if (diskQueues[r] == NULL)
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return (ENOMEM);
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for (c = 0; c < raidPtr->numCol; c++) {
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rc = rf_ConfigureDiskQueue(raidPtr, &diskQueues[r][c],
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r, c, p,
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raidPtr->sectorsPerDisk,
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raidPtr->Disks[r][c].dev,
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cfgPtr->maxOutstandingDiskReqs,
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listp, raidPtr->cleanupList);
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if (rc)
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return (rc);
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}
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}
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spareQueues = &raidPtr->Queues[0][raidPtr->numCol];
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for (r = 0; r < raidPtr->numSpare; r++) {
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rc = rf_ConfigureDiskQueue(raidPtr, &spareQueues[r],
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0, raidPtr->numCol + r, p,
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raidPtr->sectorsPerDisk,
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raidPtr->Disks[0][raidPtr->numCol + r].dev,
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cfgPtr->maxOutstandingDiskReqs, listp,
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raidPtr->cleanupList);
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if (rc)
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return (rc);
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}
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return (0);
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}
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/* Enqueue a disk I/O
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*
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* Unfortunately, we have to do things differently in the different
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* environments (simulator, user-level, kernel).
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* At user level, all I/O is blocking, so we have 1 or more threads/disk
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* and the thread that enqueues is different from the thread that dequeues.
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* In the kernel, I/O is non-blocking and so we'd like to have multiple
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* I/Os outstanding on the physical disks when possible.
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*
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* when any request arrives at a queue, we have two choices:
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* dispatch it to the lower levels
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* queue it up
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*
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* kernel rules for when to do what:
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* locking request: queue empty => dispatch and lock queue,
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* else queue it
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* unlocking req : always dispatch it
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* normal req : queue empty => dispatch it & set priority
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* queue not full & priority is ok => dispatch it
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* else queue it
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*
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* user-level rules:
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* always enqueue. In the special case of an unlocking op, enqueue
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* in a special way that will cause the unlocking op to be the next
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* thing dequeued.
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*
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* simulator rules:
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* Do the same as at user level, with the sleeps and wakeups suppressed.
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*/
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void
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rf_DiskIOEnqueue(queue, req, pri)
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RF_DiskQueue_t *queue;
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RF_DiskQueueData_t *req;
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int pri;
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{
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RF_ETIMER_START(req->qtime);
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RF_ASSERT(req->type == RF_IO_TYPE_NOP || req->numSector);
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req->priority = pri;
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#if RF_DEBUG_DISKQUEUE
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if (rf_queueDebug && (req->numSector == 0)) {
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printf("Warning: Enqueueing zero-sector access\n");
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}
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#endif
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/*
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* kernel
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*/
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RF_LOCK_QUEUE_MUTEX(queue, "DiskIOEnqueue");
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/* locking request */
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if (RF_LOCKING_REQ(req)) {
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if (RF_QUEUE_EMPTY(queue)) {
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Dprintf3("Dispatching pri %d locking op to r %d c %d (queue empty)\n", pri, queue->row, queue->col);
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RF_LOCK_QUEUE(queue);
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rf_DispatchKernelIO(queue, req);
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} else {
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queue->queueLength++; /* increment count of number
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* of requests waiting in this
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* queue */
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Dprintf3("Enqueueing pri %d locking op to r %d c %d (queue not empty)\n", pri, queue->row, queue->col);
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req->queue = (void *) queue;
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(queue->qPtr->Enqueue) (queue->qHdr, req, pri);
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}
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}
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/* unlocking request */
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else
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if (RF_UNLOCKING_REQ(req)) { /* we'll do the actual unlock
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* when this I/O completes */
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Dprintf3("Dispatching pri %d unlocking op to r %d c %d\n", pri, queue->row, queue->col);
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RF_ASSERT(RF_QUEUE_LOCKED(queue));
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rf_DispatchKernelIO(queue, req);
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}
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/* normal request */
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else
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if (RF_OK_TO_DISPATCH(queue, req)) {
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Dprintf3("Dispatching pri %d regular op to r %d c %d (ok to dispatch)\n", pri, queue->row, queue->col);
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rf_DispatchKernelIO(queue, req);
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} else {
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queue->queueLength++; /* increment count of
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* number of requests
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* waiting in this queue */
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Dprintf3("Enqueueing pri %d regular op to r %d c %d (not ok to dispatch)\n", pri, queue->row, queue->col);
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req->queue = (void *) queue;
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(queue->qPtr->Enqueue) (queue->qHdr, req, pri);
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}
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RF_UNLOCK_QUEUE_MUTEX(queue, "DiskIOEnqueue");
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}
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/* get the next set of I/Os started, kernel version only */
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void
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rf_DiskIOComplete(queue, req, status)
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RF_DiskQueue_t *queue;
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RF_DiskQueueData_t *req;
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int status;
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{
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int done = 0;
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RF_LOCK_QUEUE_MUTEX(queue, "DiskIOComplete");
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/* unlock the queue: (1) after an unlocking req completes (2) after a
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* locking req fails */
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if (RF_UNLOCKING_REQ(req) || (RF_LOCKING_REQ(req) && status)) {
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Dprintf2("DiskIOComplete: unlocking queue at r %d c %d\n", queue->row, queue->col);
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RF_ASSERT(RF_QUEUE_LOCKED(queue));
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RF_UNLOCK_QUEUE(queue);
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}
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queue->numOutstanding--;
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RF_ASSERT(queue->numOutstanding >= 0);
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/* dispatch requests to the disk until we find one that we can't. */
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/* no reason to continue once we've filled up the queue */
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/* no reason to even start if the queue is locked */
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while (!done && !RF_QUEUE_FULL(queue) && !RF_QUEUE_LOCKED(queue)) {
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if (queue->nextLockingOp) {
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req = queue->nextLockingOp;
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queue->nextLockingOp = NULL;
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Dprintf3("DiskIOComplete: a pri %d locking req was pending at r %d c %d\n", req->priority, queue->row, queue->col);
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} else {
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req = (queue->qPtr->Dequeue) (queue->qHdr);
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if (req != NULL) {
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Dprintf3("DiskIOComplete: extracting pri %d req from queue at r %d c %d\n", req->priority, queue->row, queue->col);
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} else {
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Dprintf1("DiskIOComplete: no more requests to extract.\n", "");
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}
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}
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if (req) {
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queue->queueLength--; /* decrement count of number
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* of requests waiting in this
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* queue */
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RF_ASSERT(queue->queueLength >= 0);
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}
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if (!req)
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done = 1;
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else
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if (RF_LOCKING_REQ(req)) {
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if (RF_QUEUE_EMPTY(queue)) { /* dispatch it */
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Dprintf3("DiskIOComplete: dispatching pri %d locking req to r %d c %d (queue empty)\n", req->priority, queue->row, queue->col);
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RF_LOCK_QUEUE(queue);
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rf_DispatchKernelIO(queue, req);
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done = 1;
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} else { /* put it aside to wait for
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* the queue to drain */
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Dprintf3("DiskIOComplete: postponing pri %d locking req to r %d c %d\n", req->priority, queue->row, queue->col);
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RF_ASSERT(queue->nextLockingOp == NULL);
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queue->nextLockingOp = req;
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done = 1;
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}
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} else
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if (RF_UNLOCKING_REQ(req)) { /* should not happen:
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* unlocking ops should
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* not get queued */
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RF_ASSERT(RF_QUEUE_LOCKED(queue)); /* support it anyway for
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* the future */
|
|
Dprintf3("DiskIOComplete: dispatching pri %d unl req to r %d c %d (SHOULD NOT SEE THIS)\n", req->priority, queue->row, queue->col);
|
|
rf_DispatchKernelIO(queue, req);
|
|
done = 1;
|
|
} else
|
|
if (RF_OK_TO_DISPATCH(queue, req)) {
|
|
Dprintf3("DiskIOComplete: dispatching pri %d regular req to r %d c %d (ok to dispatch)\n", req->priority, queue->row, queue->col);
|
|
rf_DispatchKernelIO(queue, req);
|
|
} else { /* we can't dispatch it,
|
|
* so just re-enqueue
|
|
* it. */
|
|
/* potential trouble here if
|
|
* disk queues batch reqs */
|
|
Dprintf3("DiskIOComplete: re-enqueueing pri %d regular req to r %d c %d\n", req->priority, queue->row, queue->col);
|
|
queue->queueLength++;
|
|
(queue->qPtr->Enqueue) (queue->qHdr, req, req->priority);
|
|
done = 1;
|
|
}
|
|
}
|
|
|
|
RF_UNLOCK_QUEUE_MUTEX(queue, "DiskIOComplete");
|
|
}
|
|
/* promotes accesses tagged with the given parityStripeID from low priority
|
|
* to normal priority. This promotion is optional, meaning that a queue
|
|
* need not implement it. If there is no promotion routine associated with
|
|
* a queue, this routine does nothing and returns -1.
|
|
*/
|
|
int
|
|
rf_DiskIOPromote(queue, parityStripeID, which_ru)
|
|
RF_DiskQueue_t *queue;
|
|
RF_StripeNum_t parityStripeID;
|
|
RF_ReconUnitNum_t which_ru;
|
|
{
|
|
int retval;
|
|
|
|
if (!queue->qPtr->Promote)
|
|
return (-1);
|
|
RF_LOCK_QUEUE_MUTEX(queue, "DiskIOPromote");
|
|
retval = (queue->qPtr->Promote) (queue->qHdr, parityStripeID, which_ru);
|
|
RF_UNLOCK_QUEUE_MUTEX(queue, "DiskIOPromote");
|
|
return (retval);
|
|
}
|
|
|
|
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 *p;
|
|
|
|
RF_FREELIST_GET_INIT(rf_dqd_freelist, p, next, (RF_DiskQueueData_t *), init_dqd);
|
|
|
|
p->sectorOffset = ssect + rf_protectedSectors;
|
|
p->numSector = nsect;
|
|
p->type = typ;
|
|
p->buf = buf;
|
|
p->parityStripeID = parityStripeID;
|
|
p->which_ru = which_ru;
|
|
p->CompleteFunc = wakeF;
|
|
p->argument = arg;
|
|
p->next = next;
|
|
p->tracerec = tracerec;
|
|
p->priority = RF_IO_NORMAL_PRIORITY;
|
|
p->raidPtr = raidPtr;
|
|
p->flags = flags;
|
|
p->b_proc = kb_proc;
|
|
return (p);
|
|
}
|
|
|
|
void
|
|
rf_FreeDiskQueueData(p)
|
|
RF_DiskQueueData_t *p;
|
|
{
|
|
RF_FREELIST_FREE_CLEAN(rf_dqd_freelist, p, next, clean_dqd);
|
|
}
|