224 lines
6.4 KiB
C
224 lines
6.4 KiB
C
/* $NetBSD: rf_revent.c,v 1.8 2000/09/11 00:22:45 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:
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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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* revent.c -- reconstruction event handling code
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*/
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#include <sys/errno.h>
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#include "rf_raid.h"
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#include "rf_revent.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_desc.h"
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#include "rf_shutdown.h"
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static RF_FreeList_t *rf_revent_freelist;
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#define RF_MAX_FREE_REVENT 128
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#define RF_REVENT_INC 8
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#define RF_REVENT_INITIAL 8
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#include <sys/proc.h>
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#include <sys/kernel.h>
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#define DO_WAIT(_rc) \
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tsleep(&(_rc)->eventQueue, PRIBIO, "raidframe eventq", 0)
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#define DO_SIGNAL(_rc) wakeup(&(_rc)->eventQueue)
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static void rf_ShutdownReconEvent(void *);
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static RF_ReconEvent_t *
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GetReconEventDesc(RF_RowCol_t row, RF_RowCol_t col,
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void *arg, RF_Revent_t type);
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static void rf_ShutdownReconEvent(ignored)
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void *ignored;
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{
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RF_FREELIST_DESTROY(rf_revent_freelist, next, (RF_ReconEvent_t *));
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}
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int
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rf_ConfigureReconEvent(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_revent_freelist, RF_MAX_FREE_REVENT,
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RF_REVENT_INC, sizeof(RF_ReconEvent_t));
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if (rf_revent_freelist == NULL)
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return (ENOMEM);
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rc = rf_ShutdownCreate(listp, rf_ShutdownReconEvent, NULL);
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if (rc) {
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RF_ERRORMSG3("Unable to add to shutdown list file %s line %d rc=%d\n", __FILE__,
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__LINE__, rc);
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rf_ShutdownReconEvent(NULL);
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return (rc);
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}
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RF_FREELIST_PRIME(rf_revent_freelist, RF_REVENT_INITIAL, next,
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(RF_ReconEvent_t *));
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return (0);
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}
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/* returns the next reconstruction event, blocking the calling thread
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* until one becomes available. will now return null if it is blocked
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* or will return an event if it is not */
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RF_ReconEvent_t *
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rf_GetNextReconEvent(reconDesc, row, continueFunc, continueArg)
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RF_RaidReconDesc_t *reconDesc;
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RF_RowCol_t row;
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void (*continueFunc) (void *);
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void *continueArg;
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{
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RF_Raid_t *raidPtr = reconDesc->raidPtr;
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RF_ReconCtrl_t *rctrl = raidPtr->reconControl[row];
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RF_ReconEvent_t *event;
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RF_ASSERT(row >= 0 && row <= raidPtr->numRow);
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RF_LOCK_MUTEX(rctrl->eq_mutex);
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/* q null and count==0 must be equivalent conditions */
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RF_ASSERT((rctrl->eventQueue == NULL) == (rctrl->eq_count == 0));
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rctrl->continueFunc = continueFunc;
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rctrl->continueArg = continueArg;
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/* mpsleep timeout value: secs = timo_val/hz. 'ticks' here is
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defined as cycle-counter ticks, not softclock ticks */
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#define MAX_RECON_EXEC_USECS (100 * 1000) /* 100 ms */
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#define RECON_DELAY_MS 25
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#define RECON_TIMO ((RECON_DELAY_MS * hz) / 1000)
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/* we are not pre-emptible in the kernel, but we don't want to run
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* forever. If we run w/o blocking for more than MAX_RECON_EXEC_TICKS
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* ticks of the cycle counter, delay for RECON_DELAY before
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* continuing. this may murder us with context switches, so we may
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* need to increase both the MAX...TICKS and the RECON_DELAY_MS. */
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if (reconDesc->reconExecTimerRunning) {
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int status;
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RF_ETIMER_STOP(reconDesc->recon_exec_timer);
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RF_ETIMER_EVAL(reconDesc->recon_exec_timer);
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reconDesc->reconExecTicks +=
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RF_ETIMER_VAL_US(reconDesc->recon_exec_timer);
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if (reconDesc->reconExecTicks > reconDesc->maxReconExecTicks)
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reconDesc->maxReconExecTicks =
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reconDesc->reconExecTicks;
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if (reconDesc->reconExecTicks >= MAX_RECON_EXEC_USECS) {
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/* we've been running too long. delay for
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* RECON_DELAY_MS */
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#if RF_RECON_STATS > 0
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reconDesc->numReconExecDelays++;
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#endif /* RF_RECON_STATS > 0 */
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status = tsleep(&reconDesc->reconExecTicks,
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PRIBIO, "recon delay", RECON_TIMO);
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RF_ASSERT(status == EWOULDBLOCK);
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reconDesc->reconExecTicks = 0;
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}
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}
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while (!rctrl->eventQueue) {
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#if RF_RECON_STATS > 0
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reconDesc->numReconEventWaits++;
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#endif /* RF_RECON_STATS > 0 */
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DO_WAIT(rctrl);
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reconDesc->reconExecTicks = 0; /* we've just waited */
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}
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reconDesc->reconExecTimerRunning = 1;
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if (RF_ETIMER_VAL_US(reconDesc->recon_exec_timer)!=0) {
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/* it moved!! reset the timer. */
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RF_ETIMER_START(reconDesc->recon_exec_timer);
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}
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event = rctrl->eventQueue;
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rctrl->eventQueue = event->next;
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event->next = NULL;
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rctrl->eq_count--;
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/* q null and count==0 must be equivalent conditions */
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RF_ASSERT((rctrl->eventQueue == NULL) == (rctrl->eq_count == 0));
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RF_UNLOCK_MUTEX(rctrl->eq_mutex);
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return (event);
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}
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/* enqueues a reconstruction event on the indicated queue */
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void
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rf_CauseReconEvent(raidPtr, row, col, arg, type)
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RF_Raid_t *raidPtr;
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RF_RowCol_t row;
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RF_RowCol_t col;
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void *arg;
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RF_Revent_t type;
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{
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RF_ReconCtrl_t *rctrl = raidPtr->reconControl[row];
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RF_ReconEvent_t *event = GetReconEventDesc(row, col, arg, type);
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if (type == RF_REVENT_BUFCLEAR) {
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RF_ASSERT(col != rctrl->fcol);
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}
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RF_ASSERT(row >= 0 && row <= raidPtr->numRow && col >= 0 && col <= raidPtr->numCol);
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RF_LOCK_MUTEX(rctrl->eq_mutex);
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/* q null and count==0 must be equivalent conditions */
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RF_ASSERT((rctrl->eventQueue == NULL) == (rctrl->eq_count == 0));
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event->next = rctrl->eventQueue;
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rctrl->eventQueue = event;
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rctrl->eq_count++;
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RF_UNLOCK_MUTEX(rctrl->eq_mutex);
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DO_SIGNAL(rctrl);
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}
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/* allocates and initializes a recon event descriptor */
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static RF_ReconEvent_t *
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GetReconEventDesc(row, col, arg, type)
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RF_RowCol_t row;
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RF_RowCol_t col;
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void *arg;
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RF_Revent_t type;
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{
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RF_ReconEvent_t *t;
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RF_FREELIST_GET(rf_revent_freelist, t, next, (RF_ReconEvent_t *));
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if (t == NULL)
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return (NULL);
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t->col = col;
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t->arg = arg;
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t->type = type;
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return (t);
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}
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void
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rf_FreeReconEventDesc(event)
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RF_ReconEvent_t *event;
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{
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RF_FREELIST_FREE(rf_revent_freelist, event, next);
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}
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