sys/dev/raidframe/rf_psstatus.c

   1 /*      $NetBSD: rf_psstatus.c,v 1.32 2006/10/12 01:31:52 christos Exp $        */
   2 /*
   3  * Copyright (c) 1995 Carnegie-Mellon University.
   4  * All rights reserved.
   5  *
   6  * Author: Mark Holland
   7  *
   8  * Permission to use, copy, modify and distribute this software and
   9  * its documentation is hereby granted, provided that both the copyright
  10  * notice and this permission notice appear in all copies of the
  11  * software, derivative works or modified versions, and any portions
  12  * thereof, and that both notices appear in supporting documentation.
  13  *
  14  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  15  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
  16  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  17  *
  18  * Carnegie Mellon requests users of this software to return to
  19  *
  20  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  21  *  School of Computer Science
  22  *  Carnegie Mellon University
  23  *  Pittsburgh PA 15213-3890
  24  *
  25  * any improvements or extensions that they make and grant Carnegie the
  26  * rights to redistribute these changes.
  27  */
  28
  29 /*****************************************************************************
  30  *
  31  * psstatus.c
  32  *
  33  * The reconstruction code maintains a bunch of status related to the parity
  34  * stripes that are currently under reconstruction.  This header file defines
  35  * the status structures.
  36  *
  37  *****************************************************************************/
  38
  39 #include <sys/cdefs.h>
  40 __KERNEL_RCSID(0, "$NetBSD: rf_psstatus.c,v 1.32 2006/10/12 01:31:52 christos Exp $");
  41
  42 #include <dev/raidframe/raidframevar.h>
  43
  44 #include "rf_raid.h"
  45 #include "rf_general.h"
  46 #include "rf_debugprint.h"
  47 #include "rf_psstatus.h"
  48 #include "rf_shutdown.h"
  49
  50 #if RF_DEBUG_PSS
  51 #define Dprintf1(s,a)         if (rf_pssDebug) rf_debug_printf(s,(void *)((unsigned long)a),NULL,NULL,NULL,NULL,NULL,NULL,NULL)
  52 #define Dprintf2(s,a,b)       if (rf_pssDebug) rf_debug_printf(s,(void *)((unsigned long)a),(void *)((unsigned long)b),NULL,NULL,NULL,NULL,NULL,NULL)
  53 #define Dprintf3(s,a,b,c)     if (rf_pssDebug) rf_debug_printf(s,(void *)((unsigned long)a),(void *)((unsigned long)b),(void *)((unsigned long)c),NULL,NULL,NULL,NULL,NULL)
  54 #else
  55 #define Dprintf1(s,a)
  56 #define Dprintf2(s,a,b)
  57 #define Dprintf3(s,a,b,c)
  58 #endif
  59
  60 static void
  61 RealPrintPSStatusTable(RF_Raid_t * raidPtr,
  62     RF_PSStatusHeader_t * pssTable);
  63
  64 #define RF_MAX_FREE_PSS  32
  65 #define RF_MIN_FREE_PSS   8
  66
  67 static void rf_ShutdownPSStatus(void *);
  68
  69 static void
  70 rf_ShutdownPSStatus(void *arg)
  71 {
  72
  73         pool_destroy(&rf_pools.pss);
  74 }
  75
  76 int
  77 rf_ConfigurePSStatus(RF_ShutdownList_t **listp)
  78 {
  79
  80         rf_pool_init(&rf_pools.pss, sizeof(RF_ReconParityStripeStatus_t),
  81                      "raidpsspl", RF_MIN_FREE_PSS, RF_MAX_FREE_PSS);
  82         rf_ShutdownCreate(listp, rf_ShutdownPSStatus, NULL);
  83
  84         return (0);
  85 }
  86
  87 void
  88 rf_InitPSStatus(RF_Raid_t *raidPtr)
  89 {
  90         raidPtr->pssTableSize = RF_PSS_DEFAULT_TABLESIZE;
  91 }
  92
  93
  94 /*****************************************************************************************
  95  * sets up the pss table
  96  * We pre-allocate a bunch of entries to avoid as much as possible having to
  97  * malloc up hash chain entries.
  98  ****************************************************************************************/
  99 RF_PSStatusHeader_t *
 100 rf_MakeParityStripeStatusTable(RF_Raid_t *raidPtr)
 101 {
 102         RF_PSStatusHeader_t *pssTable;
 103         int     i;
 104
 105         RF_Malloc(pssTable,
 106                   raidPtr->pssTableSize * sizeof(RF_PSStatusHeader_t),
 107                   (RF_PSStatusHeader_t *));
 108         for (i = 0; i < raidPtr->pssTableSize; i++) {
 109                 rf_mutex_init(&pssTable[i].mutex);
 110         }
 111         return (pssTable);
 112 }
 113
 114 void
 115 rf_FreeParityStripeStatusTable(RF_Raid_t *raidPtr,
 116                                RF_PSStatusHeader_t *pssTable)
 117 {
 118 #if RF_DEBUG_PSS
 119         int     i;
 120
 121         if (rf_pssDebug)
 122                 RealPrintPSStatusTable(raidPtr, pssTable);
 123
 124         for (i = 0; i < raidPtr->pssTableSize; i++) {
 125                 if (pssTable[i].chain) {
 126                         printf("ERROR: pss hash chain not null at recon shutdown\n");
 127                 }
 128         }
 129 #endif
 130         RF_Free(pssTable, raidPtr->pssTableSize * sizeof(RF_PSStatusHeader_t));
 131 }
 132
 133
 134 /* looks up the status structure for a parity stripe.
 135  * if the create_flag is on, uses (and returns) newpssPtr if
 136  * a parity status structure doesn't exist
 137  * otherwise returns NULL if the status structure does not exist
 138  *
 139  * ASSUMES THE PSS DESCRIPTOR IS LOCKED UPON ENTRY
 140  *
 141  * flags - whether or not to use newpssPtr if the needed PSS
 142  *         doesn't exist and what flags to set it to initially
 143  */
 144 RF_ReconParityStripeStatus_t *
 145 rf_LookupRUStatus(RF_Raid_t *raidPtr, RF_PSStatusHeader_t *pssTable,
 146                   RF_StripeNum_t psID, RF_ReconUnitNum_t which_ru,
 147                   RF_PSSFlags_t flags, RF_ReconParityStripeStatus_t *newpssPtr)
 148 {
 149         RF_PSStatusHeader_t *hdr = &pssTable[RF_HASH_PSID(raidPtr, psID)];
 150         RF_ReconParityStripeStatus_t *p, *pssPtr = hdr->chain;
 151
 152         for (p = pssPtr; p; p = p->next) {
 153                 if (p->parityStripeID == psID && p->which_ru == which_ru)
 154                         break;
 155         }
 156
 157         if (!p && (flags & RF_PSS_CREATE)) {
 158                 p = newpssPtr;
 159                 p->next = hdr->chain;
 160                 hdr->chain = p;
 161
 162                 p->parityStripeID = psID;
 163                 p->which_ru = which_ru;
 164                 p->flags = flags;
 165                 p->rbuf = NULL;
 166                 p->writeRbuf = NULL;
 167                 p->xorBufCount = 0;
 168                 p->blockCount = 0;
 169                 p->procWaitList = NULL;
 170                 p->blockWaitList = NULL;
 171                 p->bufWaitList = NULL;
 172         } else
 173                 if (p) {        /* we didn't create, but we want to specify
 174                                  * some new status */
 175                         p->flags |= flags;      /* add in whatever flags we're
 176                                                  * specifying */
 177                 }
 178         if (p && (flags & RF_PSS_RECON_BLOCKED)) {
 179                 p->blockCount++;/* if we're asking to block recon, bump the
 180                                  * count */
 181                 Dprintf3("raid%d: Blocked recon on psid %ld.  count now %d\n",
 182                          raidPtr->raidid, psID, p->blockCount);
 183         }
 184         return (p);
 185 }
 186 /* deletes an entry from the parity stripe status table.  typically used
 187  * when an entry has been allocated solely to block reconstruction, and
 188  * no recon was requested while recon was blocked.  Assumes the hash
 189  * chain is ALREADY LOCKED.
 190  */
 191 void
 192 rf_PSStatusDelete(RF_Raid_t *raidPtr, RF_PSStatusHeader_t *pssTable,
 193                   RF_ReconParityStripeStatus_t *pssPtr)
 194 {
 195         RF_PSStatusHeader_t *hdr = &(pssTable[RF_HASH_PSID(raidPtr, pssPtr->parityStripeID)]);
 196         RF_ReconParityStripeStatus_t *p = hdr->chain, *pt = NULL;
 197
 198         while (p) {
 199                 if (p == pssPtr) {
 200                         if (pt)
 201                                 pt->next = p->next;
 202                         else
 203                                 hdr->chain = p->next;
 204                         p->next = NULL;
 205                         rf_FreePSStatus(raidPtr, p);
 206                         return;
 207                 }
 208                 pt = p;
 209                 p = p->next;
 210         }
 211         RF_ASSERT(0);           /* we must find it here */
 212 }
 213 /* deletes an entry from the ps status table after reconstruction has completed */
 214 void
 215 rf_RemoveFromActiveReconTable(RF_Raid_t *raidPtr, RF_StripeNum_t psid,
 216                               RF_ReconUnitNum_t which_ru)
 217 {
 218         RF_PSStatusHeader_t *hdr = &(raidPtr->reconControl->pssTable[RF_HASH_PSID(raidPtr, psid)]);
 219         RF_ReconParityStripeStatus_t *p, *pt;
 220         RF_CallbackDesc_t *cb, *cb1;
 221
 222         RF_LOCK_MUTEX(hdr->mutex);
 223         while(hdr->lock) {
 224                 ltsleep(&hdr->lock, PRIBIO, "rf_racrecon", 0, &hdr->mutex);
 225         }
 226         hdr->lock = 1;
 227         RF_UNLOCK_MUTEX(hdr->mutex);
 228         for (pt = NULL, p = hdr->chain; p; pt = p, p = p->next) {
 229                 if ((p->parityStripeID == psid) && (p->which_ru == which_ru))
 230                         break;
 231         }
 232         if (p == NULL) {
 233                 rf_PrintPSStatusTable(raidPtr);
 234         }
 235         RF_ASSERT(p);           /* it must be there */
 236
 237         Dprintf2("PSS: deleting pss for psid %ld ru %d\n", psid, which_ru);
 238
 239         /* delete this entry from the hash chain */
 240         if (pt)
 241                 pt->next = p->next;
 242         else
 243                 hdr->chain = p->next;
 244         p->next = NULL;
 245
 246         RF_LOCK_MUTEX(hdr->mutex);
 247         hdr->lock = 0;
 248         RF_UNLOCK_MUTEX(hdr->mutex);
 249
 250         /* wakup anyone waiting on the parity stripe ID */
 251         cb = p->procWaitList;
 252         p->procWaitList = NULL;
 253         while (cb) {
 254                 Dprintf1("Waking up access waiting on parity stripe ID %ld\n", p->parityStripeID);
 255                 cb1 = cb->next;
 256                 (cb->callbackFunc) (cb->callbackArg);
 257                 rf_FreeCallbackDesc(cb);
 258                 cb = cb1;
 259         }
 260
 261         rf_FreePSStatus(raidPtr, p);
 262 }
 263
 264 RF_ReconParityStripeStatus_t *
 265 rf_AllocPSStatus(RF_Raid_t *raidPtr)
 266 {
 267         RF_ReconParityStripeStatus_t *p;
 268
 269         p = pool_get(&rf_pools.pss, PR_WAITOK);
 270         memset(p, 0, sizeof(RF_ReconParityStripeStatus_t));
 271         return (p);
 272 }
 273
 274 void
 275 rf_FreePSStatus(RF_Raid_t *raidPtr, RF_ReconParityStripeStatus_t *p)
 276 {
 277         RF_ASSERT(p->procWaitList == NULL);
 278         RF_ASSERT(p->blockWaitList == NULL);
 279         RF_ASSERT(p->bufWaitList == NULL);
 280
 281         pool_put(&rf_pools.pss, p);
 282 }
 283
 284 static void
 285 RealPrintPSStatusTable(RF_Raid_t *raidPtr, RF_PSStatusHeader_t *pssTable)
 286 {
 287         int     i, j, procsWaiting, blocksWaiting, bufsWaiting;
 288         RF_ReconParityStripeStatus_t *p;
 289         RF_CallbackDesc_t *cb;
 290
 291         printf("\nParity Stripe Status Table\n");
 292         for (i = 0; i < raidPtr->pssTableSize; i++) {
 293                 for (p = pssTable[i].chain; p; p = p->next) {
 294                         procsWaiting = blocksWaiting = bufsWaiting = 0;
 295                         for (cb = p->procWaitList; cb; cb = cb->next)
 296                                 procsWaiting++;
 297                         for (cb = p->blockWaitList; cb; cb = cb->next)
 298                                 blocksWaiting++;
 299                         for (cb = p->bufWaitList; cb; cb = cb->next)
 300                                 bufsWaiting++;
 301                         printf("PSID %ld RU %d : blockCount %d %d/%d/%d proc/block/buf waiting, issued ",
 302                             (long) p->parityStripeID, p->which_ru, p->blockCount, procsWaiting, blocksWaiting, bufsWaiting);
 303                         for (j = 0; j < raidPtr->numCol; j++)
 304                                 printf("%c", (p->issued[j]) ? '1' : '0');
 305                         if (!p->flags)
 306                                 printf(" flags: (none)");
 307                         else {
 308                                 if (p->flags & RF_PSS_UNDER_RECON)
 309                                         printf(" under-recon");
 310                                 if (p->flags & RF_PSS_FORCED_ON_WRITE)
 311                                         printf(" forced-w");
 312                                 if (p->flags & RF_PSS_FORCED_ON_READ)
 313                                         printf(" forced-r");
 314                                 if (p->flags & RF_PSS_RECON_BLOCKED)
 315                                         printf(" blocked");
 316                                 if (p->flags & RF_PSS_BUFFERWAIT)
 317                                         printf(" bufwait");
 318                         }
 319                         printf("\n");
 320                 }
 321         }
 322 }
 323
 324 void
 325 rf_PrintPSStatusTable(RF_Raid_t *raidPtr)
 326 {
 327         RF_PSStatusHeader_t *pssTable = raidPtr->reconControl->pssTable;
 328         RealPrintPSStatusTable(raidPtr, pssTable);
 329 }