1 /* $NetBSD: rf_reconutil.c,v 1.28 2007/03/04 06:02:39 christos 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 * rf_reconutil.c -- reconstruction utilities 31 ********************************************/ 32 33 #include <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: rf_reconutil.c,v 1.28 2007/03/04 06:02:39 christos Exp $"); 35 36 #include <dev/raidframe/raidframevar.h> 37 38 #include "rf_raid.h" 39 #include "rf_desc.h" 40 #include "rf_reconutil.h" 41 #include "rf_reconbuffer.h" 42 #include "rf_general.h" 43 #include "rf_decluster.h" 44 #include "rf_raid5_rotatedspare.h" 45 #include "rf_interdecluster.h" 46 #include "rf_chaindecluster.h" 47 48 /******************************************************************* 49 * allocates/frees the reconstruction control information structures 50 *******************************************************************/ 51 52 /* fcol - failed column 53 * scol - identifies which spare we are using 54 */ 55 56 RF_ReconCtrl_t * 57 rf_MakeReconControl(RF_RaidReconDesc_t *reconDesc, 58 RF_RowCol_t fcol, RF_RowCol_t scol) 59 { 60 RF_Raid_t *raidPtr = reconDesc->raidPtr; 61 RF_RaidLayout_t *layoutPtr = &raidPtr->Layout; 62 RF_ReconUnitCount_t RUsPerPU = layoutPtr->SUsPerPU / layoutPtr->SUsPerRU; 63 RF_ReconUnitCount_t numSpareRUs; 64 RF_ReconCtrl_t *reconCtrlPtr; 65 RF_ReconBuffer_t *rbuf; 66 const RF_LayoutSW_t *lp; 67 #if (RF_INCLUDE_PARITY_DECLUSTERING_DS > 0) 68 int retcode; 69 #endif 70 RF_RowCol_t i; 71 72 lp = raidPtr->Layout.map; 73 74 /* make and zero the global reconstruction structure and the per-disk 75 * structure */ 76 RF_Malloc(reconCtrlPtr, sizeof(RF_ReconCtrl_t), (RF_ReconCtrl_t *)); 77 78 /* note: this zeros the perDiskInfo */ 79 RF_Malloc(reconCtrlPtr->perDiskInfo, raidPtr->numCol * 80 sizeof(RF_PerDiskReconCtrl_t), (RF_PerDiskReconCtrl_t *)); 81 reconCtrlPtr->reconDesc = reconDesc; 82 reconCtrlPtr->fcol = fcol; 83 reconCtrlPtr->spareCol = scol; 84 reconCtrlPtr->lastPSID = layoutPtr->numStripe / layoutPtr->SUsPerPU; 85 reconCtrlPtr->percentComplete = 0; 86 reconCtrlPtr->error = 0; 87 reconCtrlPtr->pending_writes = 0; 88 89 /* initialize each per-disk recon information structure */ 90 for (i = 0; i < raidPtr->numCol; i++) { 91 reconCtrlPtr->perDiskInfo[i].reconCtrl = reconCtrlPtr; 92 reconCtrlPtr->perDiskInfo[i].col = i; 93 /* make it appear as if we just finished an RU */ 94 reconCtrlPtr->perDiskInfo[i].curPSID = -1; 95 reconCtrlPtr->perDiskInfo[i].ru_count = RUsPerPU - 1; 96 } 97 98 /* Get the number of spare units per disk and the sparemap in case 99 * spare is distributed */ 100 101 if (lp->GetNumSpareRUs) { 102 numSpareRUs = lp->GetNumSpareRUs(raidPtr); 103 } else { 104 numSpareRUs = 0; 105 } 106 107 #if (RF_INCLUDE_PARITY_DECLUSTERING_DS > 0) 108 /* 109 * Not all distributed sparing archs need dynamic mappings 110 */ 111 if (lp->InstallSpareTable) { 112 retcode = rf_InstallSpareTable(raidPtr, 0, fcol); 113 if (retcode) { 114 RF_PANIC(); /* XXX fix this */ 115 } 116 } 117 #endif 118 /* make the reconstruction map */ 119 reconCtrlPtr->reconMap = rf_MakeReconMap(raidPtr, (int) (layoutPtr->SUsPerRU * layoutPtr->sectorsPerStripeUnit), 120 raidPtr->sectorsPerDisk, numSpareRUs); 121 122 /* make the per-disk reconstruction buffers */ 123 for (i = 0; i < raidPtr->numCol; i++) { 124 reconCtrlPtr->perDiskInfo[i].rbuf = (i == fcol) ? NULL : rf_MakeReconBuffer(raidPtr, i, RF_RBUF_TYPE_EXCLUSIVE); 125 } 126 127 /* initialize the event queue */ 128 simple_lock_init(&reconCtrlPtr->eq_mutex); 129 130 reconCtrlPtr->eventQueue = NULL; 131 reconCtrlPtr->eq_count = 0; 132 133 /* make the floating recon buffers and append them to the free list */ 134 simple_lock_init(&reconCtrlPtr->rb_mutex); 135 136 reconCtrlPtr->fullBufferList = NULL; 137 reconCtrlPtr->floatingRbufs = NULL; 138 reconCtrlPtr->committedRbufs = NULL; 139 for (i = 0; i < raidPtr->numFloatingReconBufs; i++) { 140 rbuf = rf_MakeReconBuffer(raidPtr, fcol, 141 RF_RBUF_TYPE_FLOATING); 142 rbuf->next = reconCtrlPtr->floatingRbufs; 143 reconCtrlPtr->floatingRbufs = rbuf; 144 } 145 146 /* create the parity stripe status table */ 147 reconCtrlPtr->pssTable = rf_MakeParityStripeStatusTable(raidPtr); 148 149 /* set the initial min head sep counter val */ 150 reconCtrlPtr->minHeadSepCounter = 0; 151 152 return (reconCtrlPtr); 153 } 154 155 void 156 rf_FreeReconControl(RF_Raid_t *raidPtr) 157 { 158 RF_ReconCtrl_t *reconCtrlPtr = raidPtr->reconControl; 159 RF_ReconBuffer_t *t; 160 RF_ReconUnitNum_t i; 161 162 RF_ASSERT(reconCtrlPtr); 163 for (i = 0; i < raidPtr->numCol; i++) 164 if (reconCtrlPtr->perDiskInfo[i].rbuf) 165 rf_FreeReconBuffer(reconCtrlPtr->perDiskInfo[i].rbuf); 166 167 t = reconCtrlPtr->floatingRbufs; 168 while (t) { 169 reconCtrlPtr->floatingRbufs = t->next; 170 rf_FreeReconBuffer(t); 171 t = reconCtrlPtr->floatingRbufs; 172 } 173 174 rf_FreeReconMap(reconCtrlPtr->reconMap); 175 rf_FreeParityStripeStatusTable(raidPtr, reconCtrlPtr->pssTable); 176 RF_Free(reconCtrlPtr->perDiskInfo, 177 raidPtr->numCol * sizeof(RF_PerDiskReconCtrl_t)); 178 RF_Free(reconCtrlPtr, sizeof(*reconCtrlPtr)); 179 } 180 181 182 /****************************************************************************** 183 * computes the default head separation limit 184 *****************************************************************************/ 185 RF_HeadSepLimit_t 186 rf_GetDefaultHeadSepLimit(RF_Raid_t *raidPtr) 187 { 188 RF_HeadSepLimit_t hsl; 189 const RF_LayoutSW_t *lp; 190 191 lp = raidPtr->Layout.map; 192 if (lp->GetDefaultHeadSepLimit == NULL) 193 return (-1); 194 hsl = lp->GetDefaultHeadSepLimit(raidPtr); 195 return (hsl); 196 } 197 198 199 /****************************************************************************** 200 * computes the default number of floating recon buffers 201 *****************************************************************************/ 202 int 203 rf_GetDefaultNumFloatingReconBuffers(RF_Raid_t *raidPtr) 204 { 205 const RF_LayoutSW_t *lp; 206 int nrb; 207 208 lp = raidPtr->Layout.map; 209 if (lp->GetDefaultNumFloatingReconBuffers == NULL) 210 return (3 * raidPtr->numCol); 211 nrb = lp->GetDefaultNumFloatingReconBuffers(raidPtr); 212 return (nrb); 213 } 214 215 216 /****************************************************************************** 217 * creates and initializes a reconstruction buffer 218 *****************************************************************************/ 219 RF_ReconBuffer_t * 220 rf_MakeReconBuffer(RF_Raid_t *raidPtr, RF_RowCol_t col, RF_RbufType_t type) 221 { 222 RF_RaidLayout_t *layoutPtr = &raidPtr->Layout; 223 RF_ReconBuffer_t *t; 224 u_int recon_buffer_size = rf_RaidAddressToByte(raidPtr, layoutPtr->SUsPerRU * layoutPtr->sectorsPerStripeUnit); 225 226 t = pool_get(&rf_pools.reconbuffer, PR_WAITOK); 227 RF_Malloc(t->buffer, recon_buffer_size, (void *)); 228 t->raidPtr = raidPtr; 229 t->col = col; 230 t->priority = RF_IO_RECON_PRIORITY; 231 t->type = type; 232 t->pssPtr = NULL; 233 t->next = NULL; 234 return (t); 235 } 236 /****************************************************************************** 237 * frees a reconstruction buffer 238 *****************************************************************************/ 239 void 240 rf_FreeReconBuffer(RF_ReconBuffer_t *rbuf) 241 { 242 RF_Raid_t *raidPtr = rbuf->raidPtr; 243 u_int recon_buffer_size; 244 245 recon_buffer_size = rf_RaidAddressToByte(raidPtr, raidPtr->Layout.SUsPerRU * raidPtr->Layout.sectorsPerStripeUnit); 246 247 RF_Free(rbuf->buffer, recon_buffer_size); 248 pool_put(&rf_pools.reconbuffer, rbuf); 249 } 250 251 #if RF_DEBUG_RECON 252 XXXX IF you use this, you really want to fix the locking in here. 253 /****************************************************************************** 254 * debug only: sanity check the number of floating recon bufs in use 255 *****************************************************************************/ 256 void 257 rf_CheckFloatingRbufCount(RF_Raid_t *raidPtr, int dolock) 258 { 259 RF_ReconParityStripeStatus_t *p; 260 RF_PSStatusHeader_t *pssTable; 261 RF_ReconBuffer_t *rbuf; 262 int i, j, sum = 0; 263 264 if (dolock) 265 RF_LOCK_MUTEX(raidPtr->reconControl->rb_mutex); 266 pssTable = raidPtr->reconControl->pssTable; 267 268 for (i = 0; i < raidPtr->pssTableSize; i++) { 269 RF_LOCK_MUTEX(pssTable[i].mutex); 270 for (p = pssTable[i].chain; p; p = p->next) { 271 rbuf = (RF_ReconBuffer_t *) p->rbuf; 272 if (rbuf && rbuf->type == RF_RBUF_TYPE_FLOATING) 273 sum++; 274 275 rbuf = (RF_ReconBuffer_t *) p->writeRbuf; 276 if (rbuf && rbuf->type == RF_RBUF_TYPE_FLOATING) 277 sum++; 278 279 for (j = 0; j < p->xorBufCount; j++) { 280 rbuf = (RF_ReconBuffer_t *) p->rbufsForXor[j]; 281 RF_ASSERT(rbuf); 282 if (rbuf->type == RF_RBUF_TYPE_FLOATING) 283 sum++; 284 } 285 } 286 RF_UNLOCK_MUTEX(pssTable[i].mutex); 287 } 288 289 for (rbuf = raidPtr->reconControl->floatingRbufs; rbuf; 290 rbuf = rbuf->next) { 291 if (rbuf->type == RF_RBUF_TYPE_FLOATING) 292 sum++; 293 } 294 for (rbuf = raidPtr->reconControl->committedRbufs; rbuf; 295 rbuf = rbuf->next) { 296 if (rbuf->type == RF_RBUF_TYPE_FLOATING) 297 sum++; 298 } 299 for (rbuf = raidPtr->reconControl->fullBufferList; rbuf; 300 rbuf = rbuf->next) { 301 if (rbuf->type == RF_RBUF_TYPE_FLOATING) 302 sum++; 303 } 304 RF_ASSERT(sum == raidPtr->numFloatingReconBufs); 305 306 if (dolock) 307 RF_UNLOCK_MUTEX(raidPtr->reconControl->rb_mutex); 308 } 309 #endif 310 311