/*      $NetBSD: rf_interdecluster.c,v 1.15 2019/02/09 03:34:00 christos Exp $  */
/*
* Copyright (c) 1995 Carnegie-Mellon University.
* All rights reserved.
*
* Author: Khalil Amiri
*
* Permission to use, copy, modify and distribute this software and
* its documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
*  Software Distribution Coordinator  or  [email protected]
*  School of Computer Science
*  Carnegie Mellon University
*  Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/

/************************************************************
*
* rf_interdecluster.c -- implements interleaved declustering
*
************************************************************/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: rf_interdecluster.c,v 1.15 2019/02/09 03:34:00 christos Exp $");

#include "rf_archs.h"

#if RF_INCLUDE_INTERDECLUSTER > 0

#include <dev/raidframe/raidframevar.h>

#include "rf_raid.h"
#include "rf_interdecluster.h"
#include "rf_dag.h"
#include "rf_dagutils.h"
#include "rf_dagfuncs.h"
#include "rf_general.h"
#include "rf_utils.h"
#include "rf_dagffrd.h"
#include "rf_dagdegrd.h"
#include "rf_dagffwr.h"
#include "rf_dagdegwr.h"

typedef struct RF_InterdeclusterConfigInfo_s {
       RF_RowCol_t **stripeIdentifier; /* filled in at config time and used
                                        * by IdentifyStripe */
       RF_StripeCount_t numSparingRegions;
       RF_StripeCount_t stripeUnitsPerSparingRegion;
       RF_SectorNum_t mirrorStripeOffset;
}       RF_InterdeclusterConfigInfo_t;

int
rf_ConfigureInterDecluster(
   RF_ShutdownList_t ** listp,
   RF_Raid_t * raidPtr,
   RF_Config_t * cfgPtr)
{
       RF_RaidLayout_t *layoutPtr = &raidPtr->Layout;
       RF_StripeCount_t num_used_stripeUnitsPerDisk;
       RF_InterdeclusterConfigInfo_t *info;
       RF_RowCol_t i, tmp, SUs_per_region;

       /* create an Interleaved Declustering configuration structure */
       info = RF_MallocAndAdd(sizeof(*info), raidPtr->cleanupList);
       if (info == NULL)
               return (ENOMEM);
       layoutPtr->layoutSpecificInfo = (void *) info;

       /* fill in the config structure.  */
       SUs_per_region = raidPtr->numCol * (raidPtr->numCol - 1);
       info->stripeIdentifier = rf_make_2d_array(SUs_per_region, 2, raidPtr->cleanupList);
       if (info->stripeIdentifier == NULL)
               return (ENOMEM);
       for (i = 0; i < SUs_per_region; i++) {
               info->stripeIdentifier[i][0] = i / (raidPtr->numCol - 1);
               tmp = i / raidPtr->numCol;
               info->stripeIdentifier[i][1] = (i + 1 + tmp) % raidPtr->numCol;
       }

       /* fill in the remaining layout parameters */

       /* total number of stripes should a multiple of 2*numCol: Each sparing
        * region consists of 2*numCol stripes: n-1 primary copy, n-1
        * secondary copy and 2 for spare .. */
       num_used_stripeUnitsPerDisk = layoutPtr->stripeUnitsPerDisk - (layoutPtr->stripeUnitsPerDisk %
           (2 * raidPtr->numCol));
       info->numSparingRegions = num_used_stripeUnitsPerDisk / (2 * raidPtr->numCol);
       /* this is in fact the number of stripe units (that are primary data
        * copies) in the sparing region */
       info->stripeUnitsPerSparingRegion = raidPtr->numCol * (raidPtr->numCol - 1);
       info->mirrorStripeOffset = info->numSparingRegions * (raidPtr->numCol + 1);
       layoutPtr->numStripe = info->numSparingRegions * info->stripeUnitsPerSparingRegion;
       layoutPtr->numDataCol = 1;
       layoutPtr->dataSectorsPerStripe = layoutPtr->numDataCol * layoutPtr->sectorsPerStripeUnit;
       layoutPtr->numParityCol = 1;

       layoutPtr->dataStripeUnitsPerDisk = num_used_stripeUnitsPerDisk;

       raidPtr->sectorsPerDisk =
           num_used_stripeUnitsPerDisk * layoutPtr->sectorsPerStripeUnit;

       raidPtr->totalSectors =
           (layoutPtr->numStripe) * layoutPtr->sectorsPerStripeUnit;

       layoutPtr->stripeUnitsPerDisk = raidPtr->sectorsPerDisk / layoutPtr->sectorsPerStripeUnit;

       return (0);
}

int
rf_GetDefaultNumFloatingReconBuffersInterDecluster(RF_Raid_t * raidPtr)
{
       return (30);
}

RF_HeadSepLimit_t
rf_GetDefaultHeadSepLimitInterDecluster(RF_Raid_t * raidPtr)
{
       return (raidPtr->sectorsPerDisk);
}

RF_ReconUnitCount_t
rf_GetNumSpareRUsInterDecluster(
   RF_Raid_t * raidPtr)
{
       RF_InterdeclusterConfigInfo_t *info = (RF_InterdeclusterConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo;

       return (2 * ((RF_ReconUnitCount_t) info->numSparingRegions));
       /* the layout uses two stripe units per disk as spare within each
        * sparing region */
}
/* Maps to the primary copy of the data, i.e. the first mirror pair */
void
rf_MapSectorInterDecluster(
   RF_Raid_t * raidPtr,
   RF_RaidAddr_t raidSector,
   RF_RowCol_t * col,
   RF_SectorNum_t * diskSector,
   int remap)
{
       RF_InterdeclusterConfigInfo_t *info = (RF_InterdeclusterConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo;
       RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
       RF_StripeNum_t su_offset_into_disk, mirror_su_offset_into_disk;
       RF_StripeNum_t sparing_region_id, index_within_region;
       int     col_before_remap;

       sparing_region_id = SUID / info->stripeUnitsPerSparingRegion;
       index_within_region = SUID % info->stripeUnitsPerSparingRegion;
       su_offset_into_disk = index_within_region % (raidPtr->numCol - 1);
       mirror_su_offset_into_disk = index_within_region / raidPtr->numCol;
       col_before_remap = index_within_region / (raidPtr->numCol - 1);

       if (!remap) {
               *col = col_before_remap;
               *diskSector = (su_offset_into_disk + ((raidPtr->numCol - 1) * sparing_region_id)) *
                   raidPtr->Layout.sectorsPerStripeUnit;
               *diskSector += (raidSector % raidPtr->Layout.sectorsPerStripeUnit);
       } else {
               /* remap sector to spare space... */
               *diskSector = sparing_region_id * (raidPtr->numCol + 1) * raidPtr->Layout.sectorsPerStripeUnit;
               *diskSector += (raidPtr->numCol - 1) * raidPtr->Layout.sectorsPerStripeUnit;
               *diskSector += (raidSector % raidPtr->Layout.sectorsPerStripeUnit);
               *col = (index_within_region + 1 + mirror_su_offset_into_disk) % raidPtr->numCol;
               *col = (*col + 1) % raidPtr->numCol;
               if (*col == col_before_remap)
                       *col = (*col + 1) % raidPtr->numCol;
       }
}
/* Maps to the second copy of the mirror pair. */
void
rf_MapParityInterDecluster(
   RF_Raid_t * raidPtr,
   RF_RaidAddr_t raidSector,
   RF_RowCol_t * col,
   RF_SectorNum_t * diskSector,
   int remap)
{
       RF_InterdeclusterConfigInfo_t *info = (RF_InterdeclusterConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo;
       RF_StripeNum_t sparing_region_id, index_within_region, mirror_su_offset_into_disk;
       RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
       int     col_before_remap;

       sparing_region_id = SUID / info->stripeUnitsPerSparingRegion;
       index_within_region = SUID % info->stripeUnitsPerSparingRegion;
       mirror_su_offset_into_disk = index_within_region / raidPtr->numCol;
       col_before_remap = (index_within_region + 1 + mirror_su_offset_into_disk) % raidPtr->numCol;

       if (!remap) {
               *col = col_before_remap;
               *diskSector = info->mirrorStripeOffset * raidPtr->Layout.sectorsPerStripeUnit;
               *diskSector += sparing_region_id * (raidPtr->numCol - 1) * raidPtr->Layout.sectorsPerStripeUnit;
               *diskSector += mirror_su_offset_into_disk * raidPtr->Layout.sectorsPerStripeUnit;
               *diskSector += (raidSector % raidPtr->Layout.sectorsPerStripeUnit);
       } else {
               /* remap parity to spare space ... */
               *diskSector = sparing_region_id * (raidPtr->numCol + 1) * raidPtr->Layout.sectorsPerStripeUnit;
               *diskSector += (raidPtr->numCol) * raidPtr->Layout.sectorsPerStripeUnit;
               *diskSector += (raidSector % raidPtr->Layout.sectorsPerStripeUnit);
               *col = index_within_region / (raidPtr->numCol - 1);
               *col = (*col + 1) % raidPtr->numCol;
               if (*col == col_before_remap)
                       *col = (*col + 1) % raidPtr->numCol;
       }
}

void
rf_IdentifyStripeInterDecluster(
   RF_Raid_t * raidPtr,
   RF_RaidAddr_t addr,
   RF_RowCol_t ** diskids)
{
       RF_InterdeclusterConfigInfo_t *info = (RF_InterdeclusterConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo;
       RF_StripeNum_t SUID;

       SUID = addr / raidPtr->Layout.sectorsPerStripeUnit;
       SUID = SUID % info->stripeUnitsPerSparingRegion;

       *diskids = info->stripeIdentifier[SUID];
}

void
rf_MapSIDToPSIDInterDecluster(
   RF_RaidLayout_t * layoutPtr,
   RF_StripeNum_t stripeID,
   RF_StripeNum_t * psID,
   RF_ReconUnitNum_t * which_ru)
{
       *which_ru = 0;
       *psID = stripeID;
}
/******************************************************************************
* select a graph to perform a single-stripe access
*
* Parameters:  raidPtr    - description of the physical array
*              type       - type of operation (read or write) requested
*              asmap      - logical & physical addresses for this access
*              createFunc - name of function to use to create the graph
*****************************************************************************/

void
rf_RAIDIDagSelect(
   RF_Raid_t * raidPtr,
   RF_IoType_t type,
   RF_AccessStripeMap_t * asmap,
   RF_VoidFuncPtr * createFunc)
{
       RF_ASSERT(RF_IO_IS_R_OR_W(type));

       if (asmap->numDataFailed + asmap->numParityFailed > 1) {
               RF_ERRORMSG("Multiple disks failed in a single group!  Aborting I/O operation.\n");
               *createFunc = NULL;
               return;
       }
       *createFunc = (type == RF_IO_TYPE_READ) ? (RF_VoidFuncPtr) rf_CreateFaultFreeReadDAG : (RF_VoidFuncPtr) rf_CreateRaidOneWriteDAG;
       if (type == RF_IO_TYPE_READ) {
               if (asmap->numDataFailed == 0)
                       *createFunc = (RF_VoidFuncPtr) rf_CreateMirrorPartitionReadDAG;
               else
                       *createFunc = (RF_VoidFuncPtr) rf_CreateRaidOneDegradedReadDAG;
       } else
               *createFunc = (RF_VoidFuncPtr) rf_CreateRaidOneWriteDAG;
}
#endif /* RF_INCLUDE_INTERDECLUSTER > 0 */

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