1 /* $NetBSD: rf_psstatus.c,v 1.20 2003/12/31 00:42:46 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 1.20 2003/12/31 00:42:46 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_PSS_INC 8 66 #define RF_PSS_INITIAL 4 67 68 static void rf_ShutdownPSStatus(void *); 69 70 static void 71 rf_ShutdownPSStatus(void *arg) 72 { 73 RF_Raid_t *raidPtr = (RF_Raid_t *) arg; 74 75 pool_destroy(&raidPtr->pss_pool); 76 pool_destroy(&raidPtr->pss_issued_pool); 77 } 78 79 int 80 rf_ConfigurePSStatus(RF_ShutdownList_t **listp, RF_Raid_t *raidPtr, 81 RF_Config_t *cfgPtr) 82 { 83 int rc; 84 85 raidPtr->pssTableSize = RF_PSS_DEFAULT_TABLESIZE; 86 pool_init(&raidPtr->pss_pool, sizeof(RF_ReconParityStripeStatus_t), 0, 87 0, 0, "raidpsspl", NULL); 88 pool_init(&raidPtr->pss_issued_pool, 89 raidPtr->numCol * sizeof(char), 0, 90 0, 0, "raidpssissuedpl", NULL); 91 rc = rf_ShutdownCreate(listp, rf_ShutdownPSStatus, raidPtr); 92 if (rc) { 93 rf_print_unable_to_add_shutdown(__FILE__, __LINE__, rc); 94 rf_ShutdownPSStatus(raidPtr); 95 return (rc); 96 } 97 pool_sethiwat(&raidPtr->pss_pool, RF_MAX_FREE_PSS); 98 pool_sethiwat(&raidPtr->pss_issued_pool, RF_MAX_FREE_PSS); 99 pool_prime(&raidPtr->pss_pool, RF_PSS_INITIAL); 100 pool_prime(&raidPtr->pss_issued_pool, RF_PSS_INITIAL); 101 return (0); 102 } 103 /***************************************************************************************** 104 * sets up the pss table 105 * We pre-allocate a bunch of entries to avoid as much as possible having to 106 * malloc up hash chain entries. 107 ****************************************************************************************/ 108 RF_PSStatusHeader_t * 109 rf_MakeParityStripeStatusTable(RF_Raid_t *raidPtr) 110 { 111 RF_PSStatusHeader_t *pssTable; 112 int i; 113 114 RF_Malloc(pssTable, 115 raidPtr->pssTableSize * sizeof(RF_PSStatusHeader_t), 116 (RF_PSStatusHeader_t *)); 117 for (i = 0; i < raidPtr->pssTableSize; i++) { 118 rf_mutex_init(&pssTable[i].mutex); 119 } 120 return (pssTable); 121 } 122 123 void 124 rf_FreeParityStripeStatusTable(RF_Raid_t *raidPtr, 125 RF_PSStatusHeader_t *pssTable) 126 { 127 #if RF_DEBUG_PSS 128 int i; 129 130 if (rf_pssDebug) 131 RealPrintPSStatusTable(raidPtr, pssTable); 132 133 for (i = 0; i < raidPtr->pssTableSize; i++) { 134 if (pssTable[i].chain) { 135 printf("ERROR: pss hash chain not null at recon shutdown\n"); 136 } 137 } 138 #endif 139 RF_Free(pssTable, raidPtr->pssTableSize * sizeof(RF_PSStatusHeader_t)); 140 } 141 142 143 /* looks up the status structure for a parity stripe. 144 * if the create_flag is on, creates and returns the status structure it it doesn't exist 145 * otherwise returns NULL if the status structure does not exist 146 * 147 * ASSUMES THE PSS DESCRIPTOR IS LOCKED UPON ENTRY 148 * 149 * flags - whether or not to create it if it doesn't exist and what flags 150 * to set it to initially 151 */ 152 RF_ReconParityStripeStatus_t * 153 rf_LookupRUStatus(RF_Raid_t *raidPtr, RF_PSStatusHeader_t *pssTable, 154 RF_StripeNum_t psID, RF_ReconUnitNum_t which_ru, 155 RF_PSSFlags_t flags, int *created) 156 { 157 RF_PSStatusHeader_t *hdr = &pssTable[RF_HASH_PSID(raidPtr, psID)]; 158 RF_ReconParityStripeStatus_t *p, *pssPtr = hdr->chain; 159 160 *created = 0; 161 for (p = pssPtr; p; p = p->next) { 162 if (p->parityStripeID == psID && p->which_ru == which_ru) 163 break; 164 } 165 166 if (!p && (flags & RF_PSS_CREATE)) { 167 Dprintf2("PSS: creating pss for psid %ld ru %d\n", psID, which_ru); 168 p = rf_AllocPSStatus(raidPtr); 169 p->next = hdr->chain; 170 hdr->chain = p; 171 172 p->parityStripeID = psID; 173 p->which_ru = which_ru; 174 p->flags = flags; 175 p->rbuf = NULL; 176 p->writeRbuf = NULL; 177 p->xorBufCount = 0; 178 p->blockCount = 0; 179 p->procWaitList = NULL; 180 p->blockWaitList = NULL; 181 p->bufWaitList = NULL; 182 *created = 1; 183 } else 184 if (p) { /* we didn't create, but we want to specify 185 * some new status */ 186 p->flags |= flags; /* add in whatever flags we're 187 * specifying */ 188 } 189 if (p && (flags & RF_PSS_RECON_BLOCKED)) { 190 p->blockCount++;/* if we're asking to block recon, bump the 191 * count */ 192 Dprintf3("raid%d: Blocked recon on psid %ld. count now %d\n", 193 raidPtr->raidid, psID, p->blockCount); 194 } 195 return (p); 196 } 197 /* deletes an entry from the parity stripe status table. typically used 198 * when an entry has been allocated solely to block reconstruction, and 199 * no recon was requested while recon was blocked. Assumes the hash 200 * chain is ALREADY LOCKED. 201 */ 202 void 203 rf_PSStatusDelete(RF_Raid_t *raidPtr, RF_PSStatusHeader_t *pssTable, 204 RF_ReconParityStripeStatus_t *pssPtr) 205 { 206 RF_PSStatusHeader_t *hdr = &(pssTable[RF_HASH_PSID(raidPtr, pssPtr->parityStripeID)]); 207 RF_ReconParityStripeStatus_t *p = hdr->chain, *pt = NULL; 208 209 while (p) { 210 if (p == pssPtr) { 211 if (pt) 212 pt->next = p->next; 213 else 214 hdr->chain = p->next; 215 p->next = NULL; 216 rf_FreePSStatus(raidPtr, p); 217 return; 218 } 219 pt = p; 220 p = p->next; 221 } 222 RF_ASSERT(0); /* we must find it here */ 223 } 224 /* deletes an entry from the ps status table after reconstruction has completed */ 225 void 226 rf_RemoveFromActiveReconTable(RF_Raid_t *raidPtr, RF_StripeNum_t psid, 227 RF_ReconUnitNum_t which_ru) 228 { 229 RF_PSStatusHeader_t *hdr = &(raidPtr->reconControl->pssTable[RF_HASH_PSID(raidPtr, psid)]); 230 RF_ReconParityStripeStatus_t *p, *pt; 231 RF_CallbackDesc_t *cb, *cb1; 232 233 RF_LOCK_MUTEX(hdr->mutex); 234 for (pt = NULL, p = hdr->chain; p; pt = p, p = p->next) { 235 if ((p->parityStripeID == psid) && (p->which_ru == which_ru)) 236 break; 237 } 238 if (p == NULL) { 239 rf_PrintPSStatusTable(raidPtr); 240 } 241 RF_ASSERT(p); /* it must be there */ 242 243 Dprintf2("PSS: deleting pss for psid %ld ru %d\n", psid, which_ru); 244 245 /* delete this entry from the hash chain */ 246 if (pt) 247 pt->next = p->next; 248 else 249 hdr->chain = p->next; 250 p->next = NULL; 251 252 RF_UNLOCK_MUTEX(hdr->mutex); 253 254 /* wakup anyone waiting on the parity stripe ID */ 255 cb = p->procWaitList; 256 p->procWaitList = NULL; 257 while (cb) { 258 Dprintf1("Waking up access waiting on parity stripe ID %ld\n", p->parityStripeID); 259 cb1 = cb->next; 260 (cb->callbackFunc) (cb->callbackArg); 261 262 /* THIS IS WHAT THE ORIGINAL CODE HAD... the extra 0 is bogus, 263 * IMHO */ 264 /* (cb->callbackFunc)(cb->callbackArg, 0); */ 265 rf_FreeCallbackDesc(cb); 266 cb = cb1; 267 } 268 269 rf_FreePSStatus(raidPtr, p); 270 } 271 272 RF_ReconParityStripeStatus_t * 273 rf_AllocPSStatus(RF_Raid_t *raidPtr) 274 { 275 RF_ReconParityStripeStatus_t *p; 276 277 p = pool_get(&raidPtr->pss_pool, PR_WAITOK); 278 p->issued = pool_get(&raidPtr->pss_issued_pool, PR_WAITOK); 279 memset(p->issued, 0, raidPtr->numCol); 280 p->next = NULL; 281 /* no need to initialize here b/c the only place we're called from is 282 * the above Lookup */ 283 return (p); 284 } 285 286 void 287 rf_FreePSStatus(RF_Raid_t *raidPtr, RF_ReconParityStripeStatus_t *p) 288 { 289 RF_ASSERT(p->procWaitList == NULL); 290 RF_ASSERT(p->blockWaitList == NULL); 291 RF_ASSERT(p->bufWaitList == NULL); 292 293 pool_put(&raidPtr->pss_issued_pool, p->issued); 294 pool_put(&raidPtr->pss_pool, p); 295 } 296 297 static void 298 RealPrintPSStatusTable(RF_Raid_t *raidPtr, RF_PSStatusHeader_t *pssTable) 299 { 300 int i, j, procsWaiting, blocksWaiting, bufsWaiting; 301 RF_ReconParityStripeStatus_t *p; 302 RF_CallbackDesc_t *cb; 303 304 printf("\nParity Stripe Status Table\n"); 305 for (i = 0; i < raidPtr->pssTableSize; i++) { 306 for (p = pssTable[i].chain; p; p = p->next) { 307 procsWaiting = blocksWaiting = bufsWaiting = 0; 308 for (cb = p->procWaitList; cb; cb = cb->next) 309 procsWaiting++; 310 for (cb = p->blockWaitList; cb; cb = cb->next) 311 blocksWaiting++; 312 for (cb = p->bufWaitList; cb; cb = cb->next) 313 bufsWaiting++; 314 printf("PSID %ld RU %d : blockCount %d %d/%d/%d proc/block/buf waiting, issued ", 315 (long) p->parityStripeID, p->which_ru, p->blockCount, procsWaiting, blocksWaiting, bufsWaiting); 316 for (j = 0; j < raidPtr->numCol; j++) 317 printf("%c", (p->issued[j]) ? '1' : '0'); 318 if (!p->flags) 319 printf(" flags: (none)"); 320 else { 321 if (p->flags & RF_PSS_UNDER_RECON) 322 printf(" under-recon"); 323 if (p->flags & RF_PSS_FORCED_ON_WRITE) 324 printf(" forced-w"); 325 if (p->flags & RF_PSS_FORCED_ON_READ) 326 printf(" forced-r"); 327 if (p->flags & RF_PSS_RECON_BLOCKED) 328 printf(" blocked"); 329 if (p->flags & RF_PSS_BUFFERWAIT) 330 printf(" bufwait"); 331 } 332 printf("\n"); 333 } 334 } 335 } 336 337 void 338 rf_PrintPSStatusTable(RF_Raid_t *raidPtr) 339 { 340 RF_PSStatusHeader_t *pssTable = raidPtr->reconControl->pssTable; 341 RealPrintPSStatusTable(raidPtr, pssTable); 342 } 343