1 /* $NetBSD: rf_psstatus.c,v 1.28 2004/03/18 16:54:54 oster 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 1.28 2004/03/18 16:54:54 oster 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, RF_Raid_t *raidPtr, 78 RF_Config_t *cfgPtr) 79 { 80 81 raidPtr->pssTableSize = RF_PSS_DEFAULT_TABLESIZE; 82 rf_pool_init(&rf_pools.pss, sizeof(RF_ReconParityStripeStatus_t), 83 "raidpsspl", RF_MIN_FREE_PSS, RF_MAX_FREE_PSS); 84 rf_ShutdownCreate(listp, rf_ShutdownPSStatus, raidPtr); 85 86 return (0); 87 } 88 /***************************************************************************************** 89 * sets up the pss table 90 * We pre-allocate a bunch of entries to avoid as much as possible having to 91 * malloc up hash chain entries. 92 ****************************************************************************************/ 93 RF_PSStatusHeader_t * 94 rf_MakeParityStripeStatusTable(RF_Raid_t *raidPtr) 95 { 96 RF_PSStatusHeader_t *pssTable; 97 int i; 98 99 RF_Malloc(pssTable, 100 raidPtr->pssTableSize * sizeof(RF_PSStatusHeader_t), 101 (RF_PSStatusHeader_t *)); 102 for (i = 0; i < raidPtr->pssTableSize; i++) { 103 rf_mutex_init(&pssTable[i].mutex); 104 } 105 return (pssTable); 106 } 107 108 void 109 rf_FreeParityStripeStatusTable(RF_Raid_t *raidPtr, 110 RF_PSStatusHeader_t *pssTable) 111 { 112 #if RF_DEBUG_PSS 113 int i; 114 115 if (rf_pssDebug) 116 RealPrintPSStatusTable(raidPtr, pssTable); 117 118 for (i = 0; i < raidPtr->pssTableSize; i++) { 119 if (pssTable[i].chain) { 120 printf("ERROR: pss hash chain not null at recon shutdown\n"); 121 } 122 } 123 #endif 124 RF_Free(pssTable, raidPtr->pssTableSize * sizeof(RF_PSStatusHeader_t)); 125 } 126 127 128 /* looks up the status structure for a parity stripe. 129 * if the create_flag is on, uses (and returns) newpssPtr if 130 * a parity status structure doesn't exist 131 * otherwise returns NULL if the status structure does not exist 132 * 133 * ASSUMES THE PSS DESCRIPTOR IS LOCKED UPON ENTRY 134 * 135 * flags - whether or not to use newpssPtr if the needed PSS 136 * doesn't exist and what flags to set it to initially 137 */ 138 RF_ReconParityStripeStatus_t * 139 rf_LookupRUStatus(RF_Raid_t *raidPtr, RF_PSStatusHeader_t *pssTable, 140 RF_StripeNum_t psID, RF_ReconUnitNum_t which_ru, 141 RF_PSSFlags_t flags, RF_ReconParityStripeStatus_t *newpssPtr) 142 { 143 RF_PSStatusHeader_t *hdr = &pssTable[RF_HASH_PSID(raidPtr, psID)]; 144 RF_ReconParityStripeStatus_t *p, *pssPtr = hdr->chain; 145 146 for (p = pssPtr; p; p = p->next) { 147 if (p->parityStripeID == psID && p->which_ru == which_ru) 148 break; 149 } 150 151 if (!p && (flags & RF_PSS_CREATE)) { 152 p = newpssPtr; 153 p->next = hdr->chain; 154 hdr->chain = p; 155 156 p->parityStripeID = psID; 157 p->which_ru = which_ru; 158 p->flags = flags; 159 p->rbuf = NULL; 160 p->writeRbuf = NULL; 161 p->xorBufCount = 0; 162 p->blockCount = 0; 163 p->procWaitList = NULL; 164 p->blockWaitList = NULL; 165 p->bufWaitList = NULL; 166 } else 167 if (p) { /* we didn't create, but we want to specify 168 * some new status */ 169 p->flags |= flags; /* add in whatever flags we're 170 * specifying */ 171 } 172 if (p && (flags & RF_PSS_RECON_BLOCKED)) { 173 p->blockCount++;/* if we're asking to block recon, bump the 174 * count */ 175 Dprintf3("raid%d: Blocked recon on psid %ld. count now %d\n", 176 raidPtr->raidid, psID, p->blockCount); 177 } 178 return (p); 179 } 180 /* deletes an entry from the parity stripe status table. typically used 181 * when an entry has been allocated solely to block reconstruction, and 182 * no recon was requested while recon was blocked. Assumes the hash 183 * chain is ALREADY LOCKED. 184 */ 185 void 186 rf_PSStatusDelete(RF_Raid_t *raidPtr, RF_PSStatusHeader_t *pssTable, 187 RF_ReconParityStripeStatus_t *pssPtr) 188 { 189 RF_PSStatusHeader_t *hdr = &(pssTable[RF_HASH_PSID(raidPtr, pssPtr->parityStripeID)]); 190 RF_ReconParityStripeStatus_t *p = hdr->chain, *pt = NULL; 191 192 while (p) { 193 if (p == pssPtr) { 194 if (pt) 195 pt->next = p->next; 196 else 197 hdr->chain = p->next; 198 p->next = NULL; 199 rf_FreePSStatus(raidPtr, p); 200 return; 201 } 202 pt = p; 203 p = p->next; 204 } 205 RF_ASSERT(0); /* we must find it here */ 206 } 207 /* deletes an entry from the ps status table after reconstruction has completed */ 208 void 209 rf_RemoveFromActiveReconTable(RF_Raid_t *raidPtr, RF_StripeNum_t psid, 210 RF_ReconUnitNum_t which_ru) 211 { 212 RF_PSStatusHeader_t *hdr = &(raidPtr->reconControl->pssTable[RF_HASH_PSID(raidPtr, psid)]); 213 RF_ReconParityStripeStatus_t *p, *pt; 214 RF_CallbackDesc_t *cb, *cb1; 215 216 RF_LOCK_MUTEX(hdr->mutex); 217 while(hdr->lock) { 218 ltsleep(&hdr->lock, PRIBIO, "rf_racrecon", 0, &hdr->mutex); 219 } 220 hdr->lock = 1; 221 RF_UNLOCK_MUTEX(hdr->mutex); 222 for (pt = NULL, p = hdr->chain; p; pt = p, p = p->next) { 223 if ((p->parityStripeID == psid) && (p->which_ru == which_ru)) 224 break; 225 } 226 if (p == NULL) { 227 rf_PrintPSStatusTable(raidPtr); 228 } 229 RF_ASSERT(p); /* it must be there */ 230 231 Dprintf2("PSS: deleting pss for psid %ld ru %d\n", psid, which_ru); 232 233 /* delete this entry from the hash chain */ 234 if (pt) 235 pt->next = p->next; 236 else 237 hdr->chain = p->next; 238 p->next = NULL; 239 240 RF_LOCK_MUTEX(hdr->mutex); 241 hdr->lock = 0; 242 RF_UNLOCK_MUTEX(hdr->mutex); 243 244 /* wakup anyone waiting on the parity stripe ID */ 245 cb = p->procWaitList; 246 p->procWaitList = NULL; 247 while (cb) { 248 Dprintf1("Waking up access waiting on parity stripe ID %ld\n", p->parityStripeID); 249 cb1 = cb->next; 250 (cb->callbackFunc) (cb->callbackArg); 251 rf_FreeCallbackDesc(cb); 252 cb = cb1; 253 } 254 255 rf_FreePSStatus(raidPtr, p); 256 } 257 258 RF_ReconParityStripeStatus_t * 259 rf_AllocPSStatus(RF_Raid_t *raidPtr) 260 { 261 RF_ReconParityStripeStatus_t *p; 262 263 p = pool_get(&rf_pools.pss, PR_WAITOK); 264 memset(p, 0, sizeof(RF_ReconParityStripeStatus_t)); 265 return (p); 266 } 267 268 void 269 rf_FreePSStatus(RF_Raid_t *raidPtr, RF_ReconParityStripeStatus_t *p) 270 { 271 RF_ASSERT(p->procWaitList == NULL); 272 RF_ASSERT(p->blockWaitList == NULL); 273 RF_ASSERT(p->bufWaitList == NULL); 274 275 pool_put(&rf_pools.pss, p); 276 } 277 278 static void 279 RealPrintPSStatusTable(RF_Raid_t *raidPtr, RF_PSStatusHeader_t *pssTable) 280 { 281 int i, j, procsWaiting, blocksWaiting, bufsWaiting; 282 RF_ReconParityStripeStatus_t *p; 283 RF_CallbackDesc_t *cb; 284 285 printf("\nParity Stripe Status Table\n"); 286 for (i = 0; i < raidPtr->pssTableSize; i++) { 287 for (p = pssTable[i].chain; p; p = p->next) { 288 procsWaiting = blocksWaiting = bufsWaiting = 0; 289 for (cb = p->procWaitList; cb; cb = cb->next) 290 procsWaiting++; 291 for (cb = p->blockWaitList; cb; cb = cb->next) 292 blocksWaiting++; 293 for (cb = p->bufWaitList; cb; cb = cb->next) 294 bufsWaiting++; 295 printf("PSID %ld RU %d : blockCount %d %d/%d/%d proc/block/buf waiting, issued ", 296 (long) p->parityStripeID, p->which_ru, p->blockCount, procsWaiting, blocksWaiting, bufsWaiting); 297 for (j = 0; j < raidPtr->numCol; j++) 298 printf("%c", (p->issued[j]) ? '1' : '0'); 299 if (!p->flags) 300 printf(" flags: (none)"); 301 else { 302 if (p->flags & RF_PSS_UNDER_RECON) 303 printf(" under-recon"); 304 if (p->flags & RF_PSS_FORCED_ON_WRITE) 305 printf(" forced-w"); 306 if (p->flags & RF_PSS_FORCED_ON_READ) 307 printf(" forced-r"); 308 if (p->flags & RF_PSS_RECON_BLOCKED) 309 printf(" blocked"); 310 if (p->flags & RF_PSS_BUFFERWAIT) 311 printf(" bufwait"); 312 } 313 printf("\n"); 314 } 315 } 316 } 317 318 void 319 rf_PrintPSStatusTable(RF_Raid_t *raidPtr) 320 { 321 RF_PSStatusHeader_t *pssTable = raidPtr->reconControl->pssTable; 322 RealPrintPSStatusTable(raidPtr, pssTable); 323 } 324