1 /* $NetBSD: rf_reconutil.c,v 1.13 2002/11/23 01:58:18 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 * rf_reconutil.c -- reconstruction utilities 31 ********************************************/ 32 33 #include <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: rf_reconutil.c,v 1.13 2002/11/23 01:58:18 oster 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 RF_ReconCtrl_t * 52 rf_MakeReconControl(reconDesc, frow, fcol, srow, scol) 53 RF_RaidReconDesc_t *reconDesc; 54 RF_RowCol_t frow; /* failed row and column */ 55 RF_RowCol_t fcol; 56 RF_RowCol_t srow; /* identifies which spare we're using */ 57 RF_RowCol_t scol; 58 { 59 RF_Raid_t *raidPtr = reconDesc->raidPtr; 60 RF_RaidLayout_t *layoutPtr = &raidPtr->Layout; 61 RF_ReconUnitCount_t RUsPerPU = layoutPtr->SUsPerPU / layoutPtr->SUsPerRU; 62 RF_ReconUnitCount_t numSpareRUs; 63 RF_ReconCtrl_t *reconCtrlPtr; 64 RF_ReconBuffer_t *rbuf; 65 RF_LayoutSW_t *lp; 66 #if (RF_INCLUDE_PARITY_DECLUSTERING_DS > 0) 67 int retcode; 68 #endif 69 int rc; 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_Calloc(reconCtrlPtr, 1, sizeof(RF_ReconCtrl_t), (RF_ReconCtrl_t *)); 77 78 /* note: this zeros the perDiskInfo */ 79 RF_Calloc(reconCtrlPtr->perDiskInfo, raidPtr->numCol, 80 sizeof(RF_PerDiskReconCtrl_t), (RF_PerDiskReconCtrl_t *)); 81 reconCtrlPtr->reconDesc = reconDesc; 82 reconCtrlPtr->fcol = fcol; 83 reconCtrlPtr->spareRow = srow; 84 reconCtrlPtr->spareCol = scol; 85 reconCtrlPtr->lastPSID = layoutPtr->numStripe / layoutPtr->SUsPerPU; 86 reconCtrlPtr->percentComplete = 0; 87 88 /* initialize each per-disk recon information structure */ 89 for (i = 0; i < raidPtr->numCol; i++) { 90 reconCtrlPtr->perDiskInfo[i].reconCtrl = reconCtrlPtr; 91 reconCtrlPtr->perDiskInfo[i].row = frow; 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, frow, 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, frow, i, RF_RBUF_TYPE_EXCLUSIVE); 125 } 126 127 /* initialize the event queue */ 128 rc = rf_mutex_init(&reconCtrlPtr->eq_mutex); 129 if (rc) { 130 /* XXX deallocate, cleanup */ 131 rf_print_unable_to_init_mutex(__FILE__, __LINE__, rc); 132 return (NULL); 133 } 134 rc = rf_cond_init(&reconCtrlPtr->eq_cond); 135 if (rc) { 136 /* XXX deallocate, cleanup */ 137 rf_print_unable_to_init_cond(__FILE__, __LINE__, rc); 138 return (NULL); 139 } 140 reconCtrlPtr->eventQueue = NULL; 141 reconCtrlPtr->eq_count = 0; 142 143 /* make the floating recon buffers and append them to the free list */ 144 rc = rf_mutex_init(&reconCtrlPtr->rb_mutex); 145 if (rc) { 146 /* XXX deallocate, cleanup */ 147 rf_print_unable_to_init_mutex(__FILE__, __LINE__, rc); 148 return (NULL); 149 } 150 reconCtrlPtr->fullBufferList = NULL; 151 reconCtrlPtr->floatingRbufs = NULL; 152 reconCtrlPtr->committedRbufs = NULL; 153 for (i = 0; i < raidPtr->numFloatingReconBufs; i++) { 154 rbuf = rf_MakeReconBuffer(raidPtr, frow, fcol, 155 RF_RBUF_TYPE_FLOATING); 156 rbuf->next = reconCtrlPtr->floatingRbufs; 157 reconCtrlPtr->floatingRbufs = rbuf; 158 } 159 160 /* create the parity stripe status table */ 161 reconCtrlPtr->pssTable = rf_MakeParityStripeStatusTable(raidPtr); 162 163 /* set the initial min head sep counter val */ 164 reconCtrlPtr->minHeadSepCounter = 0; 165 166 return (reconCtrlPtr); 167 } 168 169 void 170 rf_FreeReconControl(raidPtr, row) 171 RF_Raid_t *raidPtr; 172 RF_RowCol_t row; 173 { 174 RF_ReconCtrl_t *reconCtrlPtr = raidPtr->reconControl[row]; 175 RF_ReconBuffer_t *t; 176 RF_ReconUnitNum_t i; 177 178 RF_ASSERT(reconCtrlPtr); 179 for (i = 0; i < raidPtr->numCol; i++) 180 if (reconCtrlPtr->perDiskInfo[i].rbuf) 181 rf_FreeReconBuffer(reconCtrlPtr->perDiskInfo[i].rbuf); 182 for (i = 0; i < raidPtr->numFloatingReconBufs; i++) { 183 t = reconCtrlPtr->floatingRbufs; 184 RF_ASSERT(t); 185 reconCtrlPtr->floatingRbufs = t->next; 186 rf_FreeReconBuffer(t); 187 } 188 rf_mutex_destroy(&reconCtrlPtr->rb_mutex); 189 rf_mutex_destroy(&reconCtrlPtr->eq_mutex); 190 rf_cond_destroy(&reconCtrlPtr->eq_cond); 191 rf_FreeReconMap(reconCtrlPtr->reconMap); 192 rf_FreeParityStripeStatusTable(raidPtr, reconCtrlPtr->pssTable); 193 RF_Free(reconCtrlPtr->perDiskInfo, 194 raidPtr->numCol * sizeof(RF_PerDiskReconCtrl_t)); 195 RF_Free(reconCtrlPtr, sizeof(*reconCtrlPtr)); 196 } 197 198 199 /****************************************************************************** 200 * computes the default head separation limit 201 *****************************************************************************/ 202 RF_HeadSepLimit_t 203 rf_GetDefaultHeadSepLimit(raidPtr) 204 RF_Raid_t *raidPtr; 205 { 206 RF_HeadSepLimit_t hsl; 207 RF_LayoutSW_t *lp; 208 209 lp = raidPtr->Layout.map; 210 if (lp->GetDefaultHeadSepLimit == NULL) 211 return (-1); 212 hsl = lp->GetDefaultHeadSepLimit(raidPtr); 213 return (hsl); 214 } 215 216 217 /****************************************************************************** 218 * computes the default number of floating recon buffers 219 *****************************************************************************/ 220 int 221 rf_GetDefaultNumFloatingReconBuffers(raidPtr) 222 RF_Raid_t *raidPtr; 223 { 224 RF_LayoutSW_t *lp; 225 int nrb; 226 227 lp = raidPtr->Layout.map; 228 if (lp->GetDefaultNumFloatingReconBuffers == NULL) 229 return (3 * raidPtr->numCol); 230 nrb = lp->GetDefaultNumFloatingReconBuffers(raidPtr); 231 return (nrb); 232 } 233 234 235 /****************************************************************************** 236 * creates and initializes a reconstruction buffer 237 *****************************************************************************/ 238 RF_ReconBuffer_t * 239 rf_MakeReconBuffer( 240 RF_Raid_t * raidPtr, 241 RF_RowCol_t row, 242 RF_RowCol_t col, 243 RF_RbufType_t type) 244 { 245 RF_RaidLayout_t *layoutPtr = &raidPtr->Layout; 246 RF_ReconBuffer_t *t; 247 u_int recon_buffer_size = rf_RaidAddressToByte(raidPtr, layoutPtr->SUsPerRU * layoutPtr->sectorsPerStripeUnit); 248 249 RF_Malloc(t, sizeof(RF_ReconBuffer_t), (RF_ReconBuffer_t *)); 250 RF_Malloc(t->buffer, recon_buffer_size, (caddr_t)); 251 t->raidPtr = raidPtr; 252 t->row = row; 253 t->col = col; 254 t->priority = RF_IO_RECON_PRIORITY; 255 t->type = type; 256 t->pssPtr = NULL; 257 t->next = NULL; 258 return (t); 259 } 260 /****************************************************************************** 261 * frees a reconstruction buffer 262 *****************************************************************************/ 263 void 264 rf_FreeReconBuffer(rbuf) 265 RF_ReconBuffer_t *rbuf; 266 { 267 RF_Raid_t *raidPtr = rbuf->raidPtr; 268 u_int recon_buffer_size; 269 270 recon_buffer_size = rf_RaidAddressToByte(raidPtr, raidPtr->Layout.SUsPerRU * raidPtr->Layout.sectorsPerStripeUnit); 271 272 RF_Free(rbuf->buffer, recon_buffer_size); 273 RF_Free(rbuf, sizeof(*rbuf)); 274 } 275 276 #if RF_DEBUG_RECON 277 /****************************************************************************** 278 * debug only: sanity check the number of floating recon bufs in use 279 *****************************************************************************/ 280 void 281 rf_CheckFloatingRbufCount(raidPtr, dolock) 282 RF_Raid_t *raidPtr; 283 int dolock; 284 { 285 RF_ReconParityStripeStatus_t *p; 286 RF_PSStatusHeader_t *pssTable; 287 RF_ReconBuffer_t *rbuf; 288 int i, j, sum = 0; 289 RF_RowCol_t frow = 0; 290 291 for (i = 0; i < raidPtr->numRow; i++) 292 if (raidPtr->reconControl[i]) { 293 frow = i; 294 break; 295 } 296 RF_ASSERT(frow >= 0); 297 298 if (dolock) 299 RF_LOCK_MUTEX(raidPtr->reconControl[frow]->rb_mutex); 300 pssTable = raidPtr->reconControl[frow]->pssTable; 301 302 for (i = 0; i < raidPtr->pssTableSize; i++) { 303 RF_LOCK_MUTEX(pssTable[i].mutex); 304 for (p = pssTable[i].chain; p; p = p->next) { 305 rbuf = (RF_ReconBuffer_t *) p->rbuf; 306 if (rbuf && rbuf->type == RF_RBUF_TYPE_FLOATING) 307 sum++; 308 309 rbuf = (RF_ReconBuffer_t *) p->writeRbuf; 310 if (rbuf && rbuf->type == RF_RBUF_TYPE_FLOATING) 311 sum++; 312 313 for (j = 0; j < p->xorBufCount; j++) { 314 rbuf = (RF_ReconBuffer_t *) p->rbufsForXor[j]; 315 RF_ASSERT(rbuf); 316 if (rbuf->type == RF_RBUF_TYPE_FLOATING) 317 sum++; 318 } 319 } 320 RF_UNLOCK_MUTEX(pssTable[i].mutex); 321 } 322 323 for (rbuf = raidPtr->reconControl[frow]->floatingRbufs; rbuf; 324 rbuf = rbuf->next) { 325 if (rbuf->type == RF_RBUF_TYPE_FLOATING) 326 sum++; 327 } 328 for (rbuf = raidPtr->reconControl[frow]->committedRbufs; rbuf; 329 rbuf = rbuf->next) { 330 if (rbuf->type == RF_RBUF_TYPE_FLOATING) 331 sum++; 332 } 333 for (rbuf = raidPtr->reconControl[frow]->fullBufferList; rbuf; 334 rbuf = rbuf->next) { 335 if (rbuf->type == RF_RBUF_TYPE_FLOATING) 336 sum++; 337 } 338 RF_ASSERT(sum == raidPtr->numFloatingReconBufs); 339 340 if (dolock) 341 RF_UNLOCK_MUTEX(raidPtr->reconControl[frow]->rb_mutex); 342 } 343 #endif 344 345