470 lines
16 KiB
C
470 lines
16 KiB
C
/* $NetBSD: rf_reconbuffer.c,v 1.3 1999/02/05 00:06:16 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_reconbuffer.c -- reconstruction buffer manager
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*
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***************************************************/
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#include "rf_raid.h"
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#include "rf_reconbuffer.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_debugprint.h"
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#include "rf_revent.h"
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#include "rf_reconutil.h"
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#include "rf_nwayxor.h"
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#define Dprintf1(s,a) if (rf_reconbufferDebug) printf(s,a)
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#define Dprintf2(s,a,b) if (rf_reconbufferDebug) printf(s,a,b)
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#define Dprintf3(s,a,b,c) if (rf_reconbufferDebug) printf(s,a,b,c)
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#define Dprintf4(s,a,b,c,d) if (rf_reconbufferDebug) printf(s,a,b,c,d)
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#define Dprintf5(s,a,b,c,d,e) if (rf_reconbufferDebug) printf(s,a,b,c,d,e)
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/*****************************************************************************************
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*
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* Submit a reconstruction buffer to the manager for XOR.
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* We can only submit a buffer if (1) we can xor into an existing buffer, which means
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* we don't have to acquire a new one, (2) we can acquire a floating
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* recon buffer, or (3) the caller has indicated that we are allowed to keep the
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* submitted buffer.
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*
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* Returns non-zero if and only if we were not able to submit.
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* In this case, we append the current disk ID to the wait list on the indicated
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* RU, so that it will be re-enabled when we acquire a buffer for this RU.
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*
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****************************************************************************************/
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/* just to make the code below more readable */
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#define BUFWAIT_APPEND(_cb_, _pssPtr_, _row_, _col_) \
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_cb_ = rf_AllocCallbackDesc(); \
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(_cb_)->row = (_row_); (_cb_)->col = (_col_); (_cb_)->next = (_pssPtr_)->bufWaitList; (_pssPtr_)->bufWaitList = (_cb_);
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/*
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* nWayXorFuncs[i] is a pointer to a function that will xor "i"
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* bufs into the accumulating sum.
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*/
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static RF_VoidFuncPtr nWayXorFuncs[] = {
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NULL,
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(RF_VoidFuncPtr) rf_nWayXor1,
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(RF_VoidFuncPtr) rf_nWayXor2,
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(RF_VoidFuncPtr) rf_nWayXor3,
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(RF_VoidFuncPtr) rf_nWayXor4,
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(RF_VoidFuncPtr) rf_nWayXor5,
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(RF_VoidFuncPtr) rf_nWayXor6,
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(RF_VoidFuncPtr) rf_nWayXor7,
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(RF_VoidFuncPtr) rf_nWayXor8,
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(RF_VoidFuncPtr) rf_nWayXor9
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};
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int
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rf_SubmitReconBuffer(rbuf, keep_it, use_committed)
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RF_ReconBuffer_t *rbuf; /* the recon buffer to submit */
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int keep_it; /* whether we can keep this buffer or we have
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* to return it */
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int use_committed; /* whether to use a committed or an available
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* recon buffer */
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{
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RF_LayoutSW_t *lp;
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int rc;
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lp = rbuf->raidPtr->Layout.map;
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rc = lp->SubmitReconBuffer(rbuf, keep_it, use_committed);
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return (rc);
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}
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int
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rf_SubmitReconBufferBasic(rbuf, keep_it, use_committed)
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RF_ReconBuffer_t *rbuf; /* the recon buffer to submit */
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int keep_it; /* whether we can keep this buffer or we have
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* to return it */
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int use_committed; /* whether to use a committed or an available
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* recon buffer */
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{
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RF_Raid_t *raidPtr = rbuf->raidPtr;
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RF_RaidLayout_t *layoutPtr = &raidPtr->Layout;
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RF_ReconCtrl_t *reconCtrlPtr = raidPtr->reconControl[rbuf->row];
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RF_ReconParityStripeStatus_t *pssPtr;
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RF_ReconBuffer_t *targetRbuf, *t = NULL; /* temporary rbuf
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* pointers */
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caddr_t ta; /* temporary data buffer pointer */
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RF_CallbackDesc_t *cb, *p;
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int retcode = 0, created = 0;
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RF_Etimer_t timer;
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/* makes no sense to have a submission from the failed disk */
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RF_ASSERT(rbuf);
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RF_ASSERT(rbuf->col != reconCtrlPtr->fcol);
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Dprintf5("RECON: submission by row %d col %d for psid %ld ru %d (failed offset %ld)\n",
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rbuf->row, rbuf->col, (long) rbuf->parityStripeID, rbuf->which_ru, (long) rbuf->failedDiskSectorOffset);
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RF_LOCK_PSS_MUTEX(raidPtr, rbuf->row, rbuf->parityStripeID);
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RF_LOCK_MUTEX(reconCtrlPtr->rb_mutex);
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pssPtr = rf_LookupRUStatus(raidPtr, reconCtrlPtr->pssTable, rbuf->parityStripeID, rbuf->which_ru, RF_PSS_NONE, &created);
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RF_ASSERT(pssPtr); /* if it didn't exist, we wouldn't have gotten
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* an rbuf for it */
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/* check to see if enough buffers have accumulated to do an XOR. If
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* so, there's no need to acquire a floating rbuf. Before we can do
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* any XORing, we must have acquired a destination buffer. If we
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* have, then we can go ahead and do the XOR if (1) including this
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* buffer, enough bufs have accumulated, or (2) this is the last
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* submission for this stripe. Otherwise, we have to go acquire a
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* floating rbuf. */
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targetRbuf = (RF_ReconBuffer_t *) pssPtr->rbuf;
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if ((targetRbuf != NULL) &&
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((pssPtr->xorBufCount == rf_numBufsToAccumulate - 1) || (targetRbuf->count + pssPtr->xorBufCount + 1 == layoutPtr->numDataCol))) {
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pssPtr->rbufsForXor[pssPtr->xorBufCount++] = rbuf; /* install this buffer */
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Dprintf3("RECON: row %d col %d invoking a %d-way XOR\n", rbuf->row, rbuf->col, pssPtr->xorBufCount);
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RF_ETIMER_START(timer);
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rf_MultiWayReconXor(raidPtr, pssPtr);
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RF_ETIMER_STOP(timer);
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RF_ETIMER_EVAL(timer);
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raidPtr->accumXorTimeUs += RF_ETIMER_VAL_US(timer);
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if (!keep_it) {
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raidPtr->recon_tracerecs[rbuf->col].xor_us = RF_ETIMER_VAL_US(timer);
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RF_ETIMER_STOP(raidPtr->recon_tracerecs[rbuf->col].recon_timer);
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RF_ETIMER_EVAL(raidPtr->recon_tracerecs[rbuf->col].recon_timer);
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raidPtr->recon_tracerecs[rbuf->col].specific.recon.recon_return_to_submit_us +=
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RF_ETIMER_VAL_US(raidPtr->recon_tracerecs[rbuf->col].recon_timer);
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RF_ETIMER_START(raidPtr->recon_tracerecs[rbuf->col].recon_timer);
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rf_LogTraceRec(raidPtr, &raidPtr->recon_tracerecs[rbuf->col]);
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}
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rf_CheckForFullRbuf(raidPtr, reconCtrlPtr, pssPtr, layoutPtr->numDataCol);
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/* if use_committed is on, we _must_ consume a buffer off the
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* committed list. */
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if (use_committed) {
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t = reconCtrlPtr->committedRbufs;
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RF_ASSERT(t);
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reconCtrlPtr->committedRbufs = t->next;
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rf_ReleaseFloatingReconBuffer(raidPtr, rbuf->row, t);
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}
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if (keep_it) {
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RF_UNLOCK_PSS_MUTEX(raidPtr, rbuf->row, rbuf->parityStripeID);
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RF_UNLOCK_MUTEX(reconCtrlPtr->rb_mutex);
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rf_FreeReconBuffer(rbuf);
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return (retcode);
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}
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goto out;
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}
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/* set the value of "t", which we'll use as the rbuf from here on */
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if (keep_it) {
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t = rbuf;
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} else {
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if (use_committed) { /* if a buffer has been committed to
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* us, use it */
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t = reconCtrlPtr->committedRbufs;
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RF_ASSERT(t);
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reconCtrlPtr->committedRbufs = t->next;
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t->next = NULL;
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} else
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if (reconCtrlPtr->floatingRbufs) {
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t = reconCtrlPtr->floatingRbufs;
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reconCtrlPtr->floatingRbufs = t->next;
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t->next = NULL;
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}
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}
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/* If we weren't able to acquire a buffer, append to the end of the
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* buf list in the recon ctrl struct. */
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if (!t) {
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RF_ASSERT(!keep_it && !use_committed);
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Dprintf2("RECON: row %d col %d failed to acquire floating rbuf\n", rbuf->row, rbuf->col);
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raidPtr->procsInBufWait++;
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if ((raidPtr->procsInBufWait == raidPtr->numCol - 1) && (raidPtr->numFullReconBuffers == 0)) {
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printf("Buffer wait deadlock detected. Exiting.\n");
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rf_PrintPSStatusTable(raidPtr, rbuf->row);
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RF_PANIC();
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}
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pssPtr->flags |= RF_PSS_BUFFERWAIT;
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cb = rf_AllocCallbackDesc(); /* append to buf wait list in
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* recon ctrl structure */
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cb->row = rbuf->row;
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cb->col = rbuf->col;
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cb->callbackArg.v = rbuf->parityStripeID;
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cb->callbackArg2.v = rbuf->which_ru;
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cb->next = NULL;
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if (!reconCtrlPtr->bufferWaitList)
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reconCtrlPtr->bufferWaitList = cb;
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else { /* might want to maintain head/tail pointers
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* here rather than search for end of list */
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for (p = reconCtrlPtr->bufferWaitList; p->next; p = p->next);
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p->next = cb;
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}
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retcode = 1;
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goto out;
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}
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Dprintf2("RECON: row %d col %d acquired rbuf\n", rbuf->row, rbuf->col);
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RF_ETIMER_STOP(raidPtr->recon_tracerecs[rbuf->col].recon_timer);
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RF_ETIMER_EVAL(raidPtr->recon_tracerecs[rbuf->col].recon_timer);
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raidPtr->recon_tracerecs[rbuf->col].specific.recon.recon_return_to_submit_us +=
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RF_ETIMER_VAL_US(raidPtr->recon_tracerecs[rbuf->col].recon_timer);
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RF_ETIMER_START(raidPtr->recon_tracerecs[rbuf->col].recon_timer);
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rf_LogTraceRec(raidPtr, &raidPtr->recon_tracerecs[rbuf->col]);
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/* initialize the buffer */
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if (t != rbuf) {
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t->row = rbuf->row;
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t->col = reconCtrlPtr->fcol;
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t->parityStripeID = rbuf->parityStripeID;
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t->which_ru = rbuf->which_ru;
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t->failedDiskSectorOffset = rbuf->failedDiskSectorOffset;
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t->spRow = rbuf->spRow;
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t->spCol = rbuf->spCol;
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t->spOffset = rbuf->spOffset;
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ta = t->buffer;
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t->buffer = rbuf->buffer;
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rbuf->buffer = ta; /* swap buffers */
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}
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/* the first installation always gets installed as the destination
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* buffer. subsequent installations get stacked up to allow for
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* multi-way XOR */
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if (!pssPtr->rbuf) {
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pssPtr->rbuf = t;
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t->count = 1;
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} else
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pssPtr->rbufsForXor[pssPtr->xorBufCount++] = t; /* install this buffer */
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rf_CheckForFullRbuf(raidPtr, reconCtrlPtr, pssPtr, layoutPtr->numDataCol); /* the buffer is full if
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* G=2 */
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out:
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RF_UNLOCK_PSS_MUTEX(raidPtr, rbuf->row, rbuf->parityStripeID);
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RF_UNLOCK_MUTEX(reconCtrlPtr->rb_mutex);
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return (retcode);
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}
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int
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rf_MultiWayReconXor(raidPtr, pssPtr)
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RF_Raid_t *raidPtr;
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RF_ReconParityStripeStatus_t *pssPtr; /* the pss descriptor for this
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* parity stripe */
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{
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int i, numBufs = pssPtr->xorBufCount;
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int numBytes = rf_RaidAddressToByte(raidPtr, raidPtr->Layout.sectorsPerStripeUnit * raidPtr->Layout.SUsPerRU);
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RF_ReconBuffer_t **rbufs = (RF_ReconBuffer_t **) pssPtr->rbufsForXor;
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RF_ReconBuffer_t *targetRbuf = (RF_ReconBuffer_t *) pssPtr->rbuf;
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RF_ASSERT(pssPtr->rbuf != NULL);
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RF_ASSERT(numBufs > 0 && numBufs < RF_PS_MAX_BUFS);
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#ifdef _KERNEL
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#ifndef __NetBSD__
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thread_block(); /* yield the processor before doing a big XOR */
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#endif
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#endif /* _KERNEL */
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/*
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* XXX
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*
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* What if more than 9 bufs?
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*/
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nWayXorFuncs[numBufs] (pssPtr->rbufsForXor, targetRbuf, numBytes / sizeof(long));
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/* release all the reconstruction buffers except the last one, which
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* belongs to the the disk who's submission caused this XOR to take
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* place */
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for (i = 0; i < numBufs - 1; i++) {
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if (rbufs[i]->type == RF_RBUF_TYPE_FLOATING)
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rf_ReleaseFloatingReconBuffer(raidPtr, rbufs[i]->row, rbufs[i]);
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else
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if (rbufs[i]->type == RF_RBUF_TYPE_FORCED)
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rf_FreeReconBuffer(rbufs[i]);
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else
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RF_ASSERT(0);
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}
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targetRbuf->count += pssPtr->xorBufCount;
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pssPtr->xorBufCount = 0;
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return (0);
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}
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/* removes one full buffer from one of the full-buffer lists and returns it.
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*
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* ASSUMES THE RB_MUTEX IS UNLOCKED AT ENTRY.
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*/
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RF_ReconBuffer_t *
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rf_GetFullReconBuffer(reconCtrlPtr)
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RF_ReconCtrl_t *reconCtrlPtr;
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{
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RF_ReconBuffer_t *p;
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RF_LOCK_MUTEX(reconCtrlPtr->rb_mutex);
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if ((p = reconCtrlPtr->priorityList) != NULL) {
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reconCtrlPtr->priorityList = p->next;
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p->next = NULL;
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goto out;
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}
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if ((p = reconCtrlPtr->fullBufferList) != NULL) {
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reconCtrlPtr->fullBufferList = p->next;
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p->next = NULL;
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goto out;
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}
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out:
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RF_UNLOCK_MUTEX(reconCtrlPtr->rb_mutex);
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return (p);
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}
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/* if the reconstruction buffer is full, move it to the full list, which is maintained
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* sorted by failed disk sector offset
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*
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* ASSUMES THE RB_MUTEX IS LOCKED AT ENTRY.
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*/
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int
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rf_CheckForFullRbuf(raidPtr, reconCtrl, pssPtr, numDataCol)
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RF_Raid_t *raidPtr;
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RF_ReconCtrl_t *reconCtrl;
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RF_ReconParityStripeStatus_t *pssPtr;
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int numDataCol;
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{
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RF_ReconBuffer_t *p, *pt, *rbuf = (RF_ReconBuffer_t *) pssPtr->rbuf;
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if (rbuf->count == numDataCol) {
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raidPtr->numFullReconBuffers++;
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Dprintf2("RECON: rbuf for psid %ld ru %d has filled\n",
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(long) rbuf->parityStripeID, rbuf->which_ru);
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if (!reconCtrl->fullBufferList || (rbuf->failedDiskSectorOffset < reconCtrl->fullBufferList->failedDiskSectorOffset)) {
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Dprintf2("RECON: rbuf for psid %ld ru %d is head of list\n",
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(long) rbuf->parityStripeID, rbuf->which_ru);
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rbuf->next = reconCtrl->fullBufferList;
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reconCtrl->fullBufferList = rbuf;
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} else {
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for (pt = reconCtrl->fullBufferList, p = pt->next; p && p->failedDiskSectorOffset < rbuf->failedDiskSectorOffset; pt = p, p = p->next);
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rbuf->next = p;
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pt->next = rbuf;
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Dprintf2("RECON: rbuf for psid %ld ru %d is in list\n",
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(long) rbuf->parityStripeID, rbuf->which_ru);
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}
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#if 0
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pssPtr->writeRbuf = pssPtr->rbuf; /* DEBUG ONLY: we like
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* to be able to find
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* this rbuf while it's
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* awaiting write */
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#else
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rbuf->pssPtr = pssPtr;
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#endif
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pssPtr->rbuf = NULL;
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rf_CauseReconEvent(raidPtr, rbuf->row, rbuf->col, NULL, RF_REVENT_BUFREADY);
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}
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return (0);
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}
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/* release a floating recon buffer for someone else to use.
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* assumes the rb_mutex is LOCKED at entry
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*/
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void
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rf_ReleaseFloatingReconBuffer(raidPtr, row, rbuf)
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RF_Raid_t *raidPtr;
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RF_RowCol_t row;
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RF_ReconBuffer_t *rbuf;
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{
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RF_ReconCtrl_t *rcPtr = raidPtr->reconControl[row];
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RF_CallbackDesc_t *cb;
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Dprintf2("RECON: releasing rbuf for psid %ld ru %d\n",
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(long) rbuf->parityStripeID, rbuf->which_ru);
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/* if anyone is waiting on buffers, wake one of them up. They will
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* subsequently wake up anyone else waiting on their RU */
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if (rcPtr->bufferWaitList) {
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rbuf->next = rcPtr->committedRbufs;
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rcPtr->committedRbufs = rbuf;
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cb = rcPtr->bufferWaitList;
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rcPtr->bufferWaitList = cb->next;
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rf_CauseReconEvent(raidPtr, cb->row, cb->col, (void *) 1, RF_REVENT_BUFCLEAR); /* arg==1 => we've
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* committed a buffer */
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rf_FreeCallbackDesc(cb);
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raidPtr->procsInBufWait--;
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} else {
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rbuf->next = rcPtr->floatingRbufs;
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rcPtr->floatingRbufs = rbuf;
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}
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}
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/* release any disk that is waiting on a buffer for the indicated RU.
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* assumes the rb_mutex is LOCKED at entry
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*/
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void
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rf_ReleaseBufferWaiters(raidPtr, pssPtr)
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RF_Raid_t *raidPtr;
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RF_ReconParityStripeStatus_t *pssPtr;
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{
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RF_CallbackDesc_t *cb1, *cb = pssPtr->bufWaitList;
|
|
|
|
Dprintf2("RECON: releasing buf waiters for psid %ld ru %d\n",
|
|
(long) pssPtr->parityStripeID, pssPtr->which_ru);
|
|
pssPtr->flags &= ~RF_PSS_BUFFERWAIT;
|
|
while (cb) {
|
|
cb1 = cb->next;
|
|
cb->next = NULL;
|
|
rf_CauseReconEvent(raidPtr, cb->row, cb->col, (void *) 0, RF_REVENT_BUFCLEAR); /* arg==0 => we haven't
|
|
* committed a buffer */
|
|
rf_FreeCallbackDesc(cb);
|
|
cb = cb1;
|
|
}
|
|
pssPtr->bufWaitList = NULL;
|
|
}
|
|
/* when reconstruction is forced on an RU, there may be some disks waiting to
|
|
* acquire a buffer for that RU. Since we allocate a new buffer as part of
|
|
* the forced-reconstruction process, we no longer have to wait for any
|
|
* buffers, so we wakeup any waiter that we find in the bufferWaitList
|
|
*
|
|
* assumes the rb_mutex is LOCKED at entry
|
|
*/
|
|
void
|
|
rf_ReleaseBufferWaiter(rcPtr, rbuf)
|
|
RF_ReconCtrl_t *rcPtr;
|
|
RF_ReconBuffer_t *rbuf;
|
|
{
|
|
RF_CallbackDesc_t *cb, *cbt;
|
|
|
|
for (cbt = NULL, cb = rcPtr->bufferWaitList; cb; cbt = cb, cb = cb->next) {
|
|
if ((cb->callbackArg.v == rbuf->parityStripeID) && (cb->callbackArg2.v == rbuf->which_ru)) {
|
|
Dprintf2("RECON: Dropping row %d col %d from buffer wait list\n", cb->row, cb->col);
|
|
if (cbt)
|
|
cbt->next = cb->next;
|
|
else
|
|
rcPtr->bufferWaitList = cb->next;
|
|
rf_CauseReconEvent((RF_Raid_t *) rbuf->raidPtr, cb->row, cb->col, (void *) 0, RF_REVENT_BUFREADY); /* arg==0 => no
|
|
* committed buffer */
|
|
rf_FreeCallbackDesc(cb);
|
|
return;
|
|
}
|
|
}
|
|
}
|