1 /* $NetBSD: rf_psstatus.c,v 1.31 2006/02/14 01:13:33 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 1.31 2006/02/14 01:13:33 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) 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 } 330