225 lines
6.4 KiB
C
225 lines
6.4 KiB
C
/* $NetBSD: rf_revent.c,v 1.28 2011/05/02 01:07:24 mrg 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/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: rf_revent.c,v 1.28 2011/05/02 01:07:24 mrg Exp $");
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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_desc.h"
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#include "rf_shutdown.h"
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#define RF_MAX_FREE_REVENT 128
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#define RF_MIN_FREE_REVENT 32
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#define RF_EVENTQ_WAIT 5000
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#include <sys/proc.h>
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#include <sys/kernel.h>
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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 col, void *arg, RF_Revent_t type);
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static void rf_ShutdownReconEvent(void *ignored)
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{
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pool_destroy(&rf_pools.revent);
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}
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int
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rf_ConfigureReconEvent(RF_ShutdownList_t **listp)
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{
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rf_pool_init(&rf_pools.revent, sizeof(RF_ReconEvent_t),
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"rf_revent_pl", RF_MIN_FREE_REVENT, RF_MAX_FREE_REVENT);
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rf_ShutdownCreate(listp, rf_ShutdownReconEvent, NULL);
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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(RF_RaidReconDesc_t *reconDesc)
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{
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RF_Raid_t *raidPtr = reconDesc->raidPtr;
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RF_ReconCtrl_t *rctrl = raidPtr->reconControl;
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RF_ReconEvent_t *event;
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int stall_count;
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rf_lock_mutex2(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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/* 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 = rf_sleep("rfrecond", RECON_TIMO,
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rctrl->eq_mutex);
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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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stall_count = 0;
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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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rf_timedwait_cond2(rctrl->eq_cv, rctrl->eq_mutex,
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RF_EVENTQ_WAIT);
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stall_count++;
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if ((stall_count > 10) &&
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rctrl->headSepCBList) {
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/* There is work to do on the callback list, and
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we've waited long enough... */
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rf_WakeupHeadSepCBWaiters(raidPtr);
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stall_count = 0;
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}
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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_mutex2(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(RF_Raid_t *raidPtr, RF_RowCol_t col, void *arg,
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RF_Revent_t type)
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{
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RF_ReconCtrl_t *rctrl = raidPtr->reconControl;
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RF_ReconEvent_t *event = GetReconEventDesc(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(col >= 0 && col <= raidPtr->numCol);
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rf_lock_mutex2(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_broadcast_cond2(rctrl->eq_cv);
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rf_unlock_mutex2(rctrl->eq_mutex);
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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(RF_RowCol_t col, void *arg, RF_Revent_t type)
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{
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RF_ReconEvent_t *t;
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t = pool_get(&rf_pools.revent, PR_WAITOK);
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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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t->next = NULL;
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return (t);
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}
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/*
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rf_DrainReconEventQueue() -- used in the event of a reconstruction
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problem, this function simply drains all pending events from the
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reconstruct event queue.
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*/
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void
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rf_DrainReconEventQueue(RF_RaidReconDesc_t *reconDesc)
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{
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RF_ReconCtrl_t *rctrl = reconDesc->raidPtr->reconControl;
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RF_ReconEvent_t *event;
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rf_lock_mutex2(rctrl->eq_mutex);
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while (rctrl->eventQueue!=NULL) {
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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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/* dump it */
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rf_FreeReconEventDesc(event);
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}
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rf_unlock_mutex2(rctrl->eq_mutex);
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}
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void
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rf_FreeReconEventDesc(RF_ReconEvent_t *event)
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{
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pool_put(&rf_pools.revent, event);
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}
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