rf_revent.c revision 1.4
1 /* $NetBSD: rf_revent.c,v 1.4 1999/03/14 21:53:31 oster Exp $ */ 2 /* 3 * Copyright (c) 1995 Carnegie-Mellon University. 4 * All rights reserved. 5 * 6 * Author: 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 (at) 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 * revent.c -- reconstruction event handling code 30 */ 31 32 #include <sys/errno.h> 33 34 #include "rf_raid.h" 35 #include "rf_revent.h" 36 #include "rf_etimer.h" 37 #include "rf_general.h" 38 #include "rf_freelist.h" 39 #include "rf_desc.h" 40 #include "rf_shutdown.h" 41 42 static RF_FreeList_t *rf_revent_freelist; 43 #define RF_MAX_FREE_REVENT 128 44 #define RF_REVENT_INC 8 45 #define RF_REVENT_INITIAL 8 46 47 48 49 #include <sys/proc.h> 50 51 extern int hz; 52 53 #define DO_WAIT(_rc) tsleep(&(_rc)->eventQueue, PRIBIO, "raidframe eventq", 0) 54 55 #define DO_SIGNAL(_rc) wakeup(&(_rc)->eventQueue) 56 57 58 static void rf_ShutdownReconEvent(void *); 59 60 static RF_ReconEvent_t * 61 GetReconEventDesc(RF_RowCol_t row, RF_RowCol_t col, 62 void *arg, RF_Revent_t type); 63 RF_ReconEvent_t * 64 rf_GetNextReconEvent(RF_RaidReconDesc_t *, 65 RF_RowCol_t, void (*continueFunc) (void *), 66 void *); 67 68 static void rf_ShutdownReconEvent(ignored) 69 void *ignored; 70 { 71 RF_FREELIST_DESTROY(rf_revent_freelist, next, (RF_ReconEvent_t *)); 72 } 73 74 int 75 rf_ConfigureReconEvent(listp) 76 RF_ShutdownList_t **listp; 77 { 78 int rc; 79 80 RF_FREELIST_CREATE(rf_revent_freelist, RF_MAX_FREE_REVENT, 81 RF_REVENT_INC, sizeof(RF_ReconEvent_t)); 82 if (rf_revent_freelist == NULL) 83 return (ENOMEM); 84 rc = rf_ShutdownCreate(listp, rf_ShutdownReconEvent, NULL); 85 if (rc) { 86 RF_ERRORMSG3("Unable to add to shutdown list file %s line %d rc=%d\n", __FILE__, 87 __LINE__, rc); 88 rf_ShutdownReconEvent(NULL); 89 return (rc); 90 } 91 RF_FREELIST_PRIME(rf_revent_freelist, RF_REVENT_INITIAL, next, 92 (RF_ReconEvent_t *)); 93 return (0); 94 } 95 /* returns the next reconstruction event, blocking the calling thread until 96 * one becomes available 97 */ 98 99 /* will now return null if it is blocked or will return an event if it is not */ 100 101 RF_ReconEvent_t * 102 rf_GetNextReconEvent(reconDesc, row, continueFunc, continueArg) 103 RF_RaidReconDesc_t *reconDesc; 104 RF_RowCol_t row; 105 void (*continueFunc) (void *); 106 void *continueArg; 107 { 108 RF_Raid_t *raidPtr = reconDesc->raidPtr; 109 RF_ReconCtrl_t *rctrl = raidPtr->reconControl[row]; 110 RF_ReconEvent_t *event; 111 112 RF_ASSERT(row >= 0 && row <= raidPtr->numRow); 113 RF_LOCK_MUTEX(rctrl->eq_mutex); 114 RF_ASSERT((rctrl->eventQueue == NULL) == (rctrl->eq_count == 0)); /* q null and count==0 115 * must be equivalent 116 * conditions */ 117 118 119 rctrl->continueFunc = continueFunc; 120 rctrl->continueArg = continueArg; 121 122 123 /* mpsleep timeout value: secs = timo_val/hz. 'ticks' here is defined as cycle-counter ticks, not softclock ticks */ 124 #define MAX_RECON_EXEC_TICKS 15000000 /* 150 Mhz => this many ticks in 100 125 * ms */ 126 #define RECON_DELAY_MS 25 127 #define RECON_TIMO ((RECON_DELAY_MS * hz) / 1000) 128 129 /* we are not pre-emptible in the kernel, but we don't want to run 130 * forever. If we run w/o blocking for more than MAX_RECON_EXEC_TICKS 131 * ticks of the cycle counter, delay for RECON_DELAY before 132 * continuing. this may murder us with context switches, so we may 133 * need to increase both the MAX...TICKS and the RECON_DELAY_MS. */ 134 if (reconDesc->reconExecTimerRunning) { 135 int status; 136 137 RF_ETIMER_STOP(reconDesc->recon_exec_timer); 138 RF_ETIMER_EVAL(reconDesc->recon_exec_timer); 139 reconDesc->reconExecTicks += RF_ETIMER_VAL_TICKS(reconDesc->recon_exec_timer); 140 if (reconDesc->reconExecTicks > reconDesc->maxReconExecTicks) 141 reconDesc->maxReconExecTicks = reconDesc->reconExecTicks; 142 if (reconDesc->reconExecTicks >= MAX_RECON_EXEC_TICKS) { 143 /* we've been running too long. delay for 144 * RECON_DELAY_MS */ 145 #if RF_RECON_STATS > 0 146 reconDesc->numReconExecDelays++; 147 #endif /* RF_RECON_STATS > 0 */ 148 status = tsleep(&reconDesc->reconExecTicks, PRIBIO, "recon delay", RECON_TIMO); 149 RF_ASSERT(status == EWOULDBLOCK); 150 reconDesc->reconExecTicks = 0; 151 } 152 } 153 while (!rctrl->eventQueue) { 154 #if RF_RECON_STATS > 0 155 reconDesc->numReconEventWaits++; 156 #endif /* RF_RECON_STATS > 0 */ 157 DO_WAIT(rctrl); 158 reconDesc->reconExecTicks = 0; /* we've just waited */ 159 } 160 161 reconDesc->reconExecTimerRunning = 1; 162 RF_ETIMER_START(reconDesc->recon_exec_timer); 163 164 event = rctrl->eventQueue; 165 rctrl->eventQueue = event->next; 166 event->next = NULL; 167 rctrl->eq_count--; 168 RF_ASSERT((rctrl->eventQueue == NULL) == (rctrl->eq_count == 0)); /* q null and count==0 169 * must be equivalent 170 * conditions */ 171 RF_UNLOCK_MUTEX(rctrl->eq_mutex); 172 return (event); 173 } 174 /* enqueues a reconstruction event on the indicated queue */ 175 void 176 rf_CauseReconEvent(raidPtr, row, col, arg, type) 177 RF_Raid_t *raidPtr; 178 RF_RowCol_t row; 179 RF_RowCol_t col; 180 void *arg; 181 RF_Revent_t type; 182 { 183 RF_ReconCtrl_t *rctrl = raidPtr->reconControl[row]; 184 RF_ReconEvent_t *event = GetReconEventDesc(row, col, arg, type); 185 186 if (type == RF_REVENT_BUFCLEAR) { 187 RF_ASSERT(col != rctrl->fcol); 188 } 189 RF_ASSERT(row >= 0 && row <= raidPtr->numRow && col >= 0 && col <= raidPtr->numCol); 190 RF_LOCK_MUTEX(rctrl->eq_mutex); 191 RF_ASSERT((rctrl->eventQueue == NULL) == (rctrl->eq_count == 0)); /* q null and count==0 192 * must be equivalent 193 * conditions */ 194 event->next = rctrl->eventQueue; 195 rctrl->eventQueue = event; 196 rctrl->eq_count++; 197 RF_UNLOCK_MUTEX(rctrl->eq_mutex); 198 199 DO_SIGNAL(rctrl); 200 } 201 /* allocates and initializes a recon event descriptor */ 202 static RF_ReconEvent_t * 203 GetReconEventDesc(row, col, arg, type) 204 RF_RowCol_t row; 205 RF_RowCol_t col; 206 void *arg; 207 RF_Revent_t type; 208 { 209 RF_ReconEvent_t *t; 210 211 RF_FREELIST_GET(rf_revent_freelist, t, next, (RF_ReconEvent_t *)); 212 if (t == NULL) 213 return (NULL); 214 t->col = col; 215 t->arg = arg; 216 t->type = type; 217 return (t); 218 } 219 220 void 221 rf_FreeReconEventDesc(event) 222 RF_ReconEvent_t *event; 223 { 224 RF_FREELIST_FREE(rf_revent_freelist, event, next); 225 } 226
Indexes created Tue Sep 30 17:09:57 GMT 2025