1 /* $NetBSD: rf_psstatus.c,v 1.38 2021/07/23 00:54:45 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 1.38 2021/07/23 00:54:45 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 RF_Raid_t *raidPtr; 73 74 raidPtr = (RF_Raid_t *) arg; 75 76 pool_destroy(&raidPtr->pools.pss); 77 } 78 79 int 80 rf_ConfigurePSStatus(RF_ShutdownList_t **listp, RF_Raid_t *raidPtr, 81 RF_Config_t *cfgPtr) 82 { 83 84 rf_pool_init(raidPtr, raidPtr->poolNames.pss, &raidPtr->pools.pss, sizeof(RF_ReconParityStripeStatus_t), 85 "pss", RF_MIN_FREE_PSS, RF_MAX_FREE_PSS); 86 rf_ShutdownCreate(listp, rf_ShutdownPSStatus, raidPtr); 87 88 return (0); 89 } 90 91 void 92 rf_InitPSStatus(RF_Raid_t *raidPtr) 93 { 94 raidPtr->pssTableSize = RF_PSS_DEFAULT_TABLESIZE; 95 } 96 97 98 /***************************************************************************************** 99 * sets up the pss table 100 * We pre-allocate a bunch of entries to avoid as much as possible having to 101 * malloc up hash chain entries. 102 ****************************************************************************************/ 103 RF_PSStatusHeader_t * 104 rf_MakeParityStripeStatusTable(RF_Raid_t *raidPtr) 105 { 106 RF_PSStatusHeader_t *pssTable; 107 int i; 108 109 pssTable = RF_Malloc(raidPtr->pssTableSize * sizeof(*pssTable)); 110 for (i = 0; i < raidPtr->pssTableSize; i++) { 111 rf_init_mutex2(pssTable[i].mutex, IPL_VM); 112 rf_init_cond2(pssTable[i].cond, "rfpsslk"); 113 } 114 return (pssTable); 115 } 116 117 void 118 rf_FreeParityStripeStatusTable(RF_Raid_t *raidPtr, 119 RF_PSStatusHeader_t *pssTable) 120 { 121 int i; 122 123 #if RF_DEBUG_PSS 124 if (rf_pssDebug) 125 RealPrintPSStatusTable(raidPtr, pssTable); 126 127 for (i = 0; i < raidPtr->pssTableSize; i++) { 128 if (pssTable[i].chain) { 129 printf("ERROR: pss hash chain not null at recon shutdown\n"); 130 } 131 } 132 #endif 133 for (i = 0; i < raidPtr->pssTableSize; i++) { 134 rf_destroy_mutex2(pssTable[i].mutex); 135 rf_destroy_cond2(pssTable[i].cond); 136 } 137 RF_Free(pssTable, raidPtr->pssTableSize * sizeof(RF_PSStatusHeader_t)); 138 } 139 140 141 /* looks up the status structure for a parity stripe. 142 * if the create_flag is on, uses (and returns) newpssPtr if 143 * a parity status structure doesn't exist 144 * otherwise returns NULL if the status structure does not exist 145 * 146 * ASSUMES THE PSS DESCRIPTOR IS LOCKED UPON ENTRY 147 * 148 * flags - whether or not to use newpssPtr if the needed PSS 149 * doesn't exist and what flags to set it to initially 150 */ 151 RF_ReconParityStripeStatus_t * 152 rf_LookupRUStatus(RF_Raid_t *raidPtr, RF_PSStatusHeader_t *pssTable, 153 RF_StripeNum_t psID, RF_ReconUnitNum_t which_ru, 154 RF_PSSFlags_t flags, RF_ReconParityStripeStatus_t *newpssPtr) 155 { 156 RF_PSStatusHeader_t *hdr = &pssTable[RF_HASH_PSID(raidPtr, psID)]; 157 RF_ReconParityStripeStatus_t *p, *pssPtr = hdr->chain; 158 159 for (p = pssPtr; p; p = p->next) { 160 if (p->parityStripeID == psID && p->which_ru == which_ru) 161 break; 162 } 163 164 if (!p && (flags & RF_PSS_CREATE)) { 165 p = newpssPtr; 166 p->next = hdr->chain; 167 hdr->chain = p; 168 169 p->parityStripeID = psID; 170 p->which_ru = which_ru; 171 p->flags = flags; 172 p->rbuf = NULL; 173 p->writeRbuf = NULL; 174 p->xorBufCount = 0; 175 p->blockCount = 0; 176 p->procWaitList = NULL; 177 p->blockWaitList = NULL; 178 p->bufWaitList = NULL; 179 } else 180 if (p) { /* we didn't create, but we want to specify 181 * some new status */ 182 p->flags |= flags; /* add in whatever flags we're 183 * specifying */ 184 } 185 if (p && (flags & RF_PSS_RECON_BLOCKED)) { 186 p->blockCount++;/* if we're asking to block recon, bump the 187 * count */ 188 Dprintf3("raid%d: Blocked recon on psid %ld. count now %d\n", 189 raidPtr->raidid, psID, p->blockCount); 190 } 191 return (p); 192 } 193 /* deletes an entry from the parity stripe status table. typically used 194 * when an entry has been allocated solely to block reconstruction, and 195 * no recon was requested while recon was blocked. Assumes the hash 196 * chain is ALREADY LOCKED. 197 */ 198 void 199 rf_PSStatusDelete(RF_Raid_t *raidPtr, RF_PSStatusHeader_t *pssTable, 200 RF_ReconParityStripeStatus_t *pssPtr) 201 { 202 RF_PSStatusHeader_t *hdr = &(pssTable[RF_HASH_PSID(raidPtr, pssPtr->parityStripeID)]); 203 RF_ReconParityStripeStatus_t *p = hdr->chain, *pt = NULL; 204 205 while (p) { 206 if (p == pssPtr) { 207 if (pt) 208 pt->next = p->next; 209 else 210 hdr->chain = p->next; 211 p->next = NULL; 212 rf_FreePSStatus(raidPtr, p); 213 return; 214 } 215 pt = p; 216 p = p->next; 217 } 218 RF_ASSERT(0); /* we must find it here */ 219 } 220 /* deletes an entry from the ps status table after reconstruction has completed */ 221 void 222 rf_RemoveFromActiveReconTable(RF_Raid_t *raidPtr, RF_StripeNum_t psid, 223 RF_ReconUnitNum_t which_ru) 224 { 225 RF_PSStatusHeader_t *hdr = &(raidPtr->reconControl->pssTable[RF_HASH_PSID(raidPtr, psid)]); 226 RF_ReconParityStripeStatus_t *p, *pt; 227 RF_CallbackFuncDesc_t *cb, *cb1; 228 229 rf_lock_mutex2(hdr->mutex); 230 while(hdr->lock) { 231 rf_wait_cond2(hdr->cond, hdr->mutex); 232 } 233 hdr->lock = 1; 234 rf_unlock_mutex2(hdr->mutex); 235 for (pt = NULL, p = hdr->chain; p; pt = p, p = p->next) { 236 if ((p->parityStripeID == psid) && (p->which_ru == which_ru)) 237 break; 238 } 239 if (p == NULL) { 240 rf_PrintPSStatusTable(raidPtr); 241 } 242 RF_ASSERT(p); /* it must be there */ 243 244 Dprintf2("PSS: deleting pss for psid %ld ru %d\n", psid, which_ru); 245 246 /* delete this entry from the hash chain */ 247 if (pt) 248 pt->next = p->next; 249 else 250 hdr->chain = p->next; 251 p->next = NULL; 252 253 rf_lock_mutex2(hdr->mutex); 254 hdr->lock = 0; 255 rf_unlock_mutex2(hdr->mutex); 256 257 /* wakup anyone waiting on the parity stripe ID */ 258 cb = p->procWaitList; 259 p->procWaitList = NULL; 260 while (cb) { 261 Dprintf1("Waking up access waiting on parity stripe ID %ld\n", p->parityStripeID); 262 cb1 = cb->next; 263 (cb->callbackFunc) (cb->callbackArg); 264 rf_FreeCallbackFuncDesc(raidPtr, cb); 265 cb = cb1; 266 } 267 268 rf_FreePSStatus(raidPtr, p); 269 } 270 271 RF_ReconParityStripeStatus_t * 272 rf_AllocPSStatus(RF_Raid_t *raidPtr) 273 { 274 return pool_get(&raidPtr->pools.pss, PR_WAITOK | PR_ZERO); 275 } 276 277 void 278 rf_FreePSStatus(RF_Raid_t *raidPtr, RF_ReconParityStripeStatus_t *p) 279 { 280 RF_ASSERT(p->procWaitList == NULL); 281 RF_ASSERT(p->blockWaitList == NULL); 282 RF_ASSERT(p->bufWaitList == NULL); 283 284 pool_put(&raidPtr->pools.pss, p); 285 } 286 287 static void 288 RealPrintPSStatusTable(RF_Raid_t *raidPtr, RF_PSStatusHeader_t *pssTable) 289 { 290 int i, j, procsWaiting, blocksWaiting, bufsWaiting; 291 RF_ReconParityStripeStatus_t *p; 292 RF_CallbackValueDesc_t *vb; 293 RF_CallbackFuncDesc_t *fb; 294 295 printf("\nParity Stripe Status Table\n"); 296 for (i = 0; i < raidPtr->pssTableSize; i++) { 297 for (p = pssTable[i].chain; p; p = p->next) { 298 procsWaiting = blocksWaiting = bufsWaiting = 0; 299 for (fb = p->procWaitList; fb; fb = fb->next) 300 procsWaiting++; 301 for (vb = p->blockWaitList; vb; vb = vb->next) 302 blocksWaiting++; 303 for (vb = p->bufWaitList; vb; vb = vb->next) 304 bufsWaiting++; 305 printf("PSID %ld RU %d : blockCount %d %d/%d/%d proc/block/buf waiting, issued ", 306 (long) p->parityStripeID, p->which_ru, p->blockCount, procsWaiting, blocksWaiting, bufsWaiting); 307 for (j = 0; j < raidPtr->numCol; j++) 308 printf("%c", (p->issued[j]) ? '1' : '0'); 309 if (!p->flags) 310 printf(" flags: (none)"); 311 else { 312 if (p->flags & RF_PSS_UNDER_RECON) 313 printf(" under-recon"); 314 if (p->flags & RF_PSS_FORCED_ON_WRITE) 315 printf(" forced-w"); 316 if (p->flags & RF_PSS_FORCED_ON_READ) 317 printf(" forced-r"); 318 if (p->flags & RF_PSS_RECON_BLOCKED) 319 printf(" blocked"); 320 if (p->flags & RF_PSS_BUFFERWAIT) 321 printf(" bufwait"); 322 } 323 printf("\n"); 324 } 325 } 326 } 327 328 void 329 rf_PrintPSStatusTable(RF_Raid_t *raidPtr) 330 { 331 RF_PSStatusHeader_t *pssTable = raidPtr->reconControl->pssTable; 332 RealPrintPSStatusTable(raidPtr, pssTable); 333 } 334