NetBSD/sys/dev/raidframe/rf_raid.h

/*	$NetBSD: rf_raid.h,v 1.25 2004/01/10 00:56:28 oster Exp $	*/
/*
 * Copyright (c) 1995 Carnegie-Mellon University.
 * All rights reserved.
 *
 * Author: Mark Holland
 *
 * 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  Software.Distribution@CS.CMU.EDU
 *  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_raid.h -- main header file for RAID driver
 **********************************************/


#ifndef _RF__RF_RAID_H_
#define _RF__RF_RAID_H_

#include <dev/raidframe/raidframevar.h>
#include "rf_archs.h"
#include "rf_threadstuff.h"

#include "rf_netbsd.h"

#include <sys/disklabel.h>
#include <sys/types.h>
#include <sys/queue.h>

#include "rf_alloclist.h"
#include "rf_stripelocks.h"
#include "rf_layout.h"
#include "rf_disks.h"
#include "rf_debugMem.h"
#include "rf_diskqueue.h"
#include "rf_reconstruct.h"
#include "rf_acctrace.h"
#include "rf_fifo.h"

#if RF_INCLUDE_PARITYLOGGING > 0
#include "rf_paritylog.h"
#endif				/* RF_INCLUDE_PARITYLOGGING > 0 */

#define RF_COMPONENT_LABEL_VERSION_1 1
#define RF_COMPONENT_LABEL_VERSION 2
#define RF_RAID_DIRTY 0
#define RF_RAID_CLEAN 1


/*
 * Each row in the array is a distinct parity group, so
 * each has it's own status, which is one of the following.
 */
typedef enum RF_RowStatus_e {
	rf_rs_optimal,
	rf_rs_degraded,
	rf_rs_reconstructing,
	rf_rs_reconfigured
}       RF_RowStatus_t;

struct RF_CumulativeStats_s {
	struct timeval start;	/* the time when the stats were last started */
	struct timeval stop;	/* the time when the stats were last stopped */
	long    sum_io_us;	/* sum of all user response times (us) */
	long    num_ios;	/* total number of I/Os serviced */
	long    num_sect_moved;	/* total number of sectors read or written */
};

struct RF_ThroughputStats_s {
	RF_DECLARE_MUTEX(mutex)	/* a mutex used to lock the configuration
				 * stuff */
	struct timeval start;	/* timer started when numOutstandingRequests
				 * moves from 0 to 1 */
	struct timeval stop;	/* timer stopped when numOutstandingRequests
				 * moves from 1 to 0 */
	RF_uint64 sum_io_us;	/* total time timer is enabled */
	RF_uint64 num_ios;	/* total number of ios processed by RAIDframe */
	long    num_out_ios;	/* number of outstanding ios */
};

struct RF_Raid_s {
	/* This portion never changes, and can be accessed without locking */
	/* an exception is Disks[][].status, which requires locking when it is
	 * changed.  XXX this is no longer true.  numSpare and friends can 
	 * change now. 
         */
	u_int   numCol;		/* number of columns of disks, typically == #
				 * of disks/rank */
	u_int   numSpare;	/* number of spare disks */
	int     maxQueueDepth;	/* max disk queue depth */
	RF_SectorCount_t totalSectors;	/* total number of sectors in the
					 * array */
	RF_SectorCount_t sectorsPerDisk;	/* number of sectors on each
						 * disk */
	u_int   logBytesPerSector;	/* base-2 log of the number of bytes
					 * in a sector */
	u_int   bytesPerSector;	/* bytes in a sector */
	RF_int32 sectorMask;	/* mask of bytes-per-sector */

	RF_RaidLayout_t Layout;	/* all information related to layout */
	RF_RaidDisk_t *Disks;	/* all information related to physical disks */
	RF_DiskQueue_t *Queues;/* all information related to disk queues */
	const RF_DiskQueueSW_t *qType;/* pointer to the DiskQueueSW used for the
				   component queues. */
	/* NOTE:  This is an anchor point via which the queues can be
	 * accessed, but the enqueue/dequeue routines in diskqueue.c use a
	 * local copy of this pointer for the actual accesses. */
	/* The remainder of the structure can change, and therefore requires
	 * locking on reads and updates */
	        RF_DECLARE_MUTEX(mutex)	/* mutex used to serialize access to
					 * the fields below */
	RF_RowStatus_t status;	/* the status of each row in the array */
	int     valid;		/* indicates successful configuration */
	RF_LockTableEntry_t *lockTable;	/* stripe-lock table */
	RF_LockTableEntry_t *quiesceLock;	/* quiesnce table */
	int     numFailures;	/* total number of failures in the array */
	int     numNewFailures; /* number of *new* failures (that havn't 
				   caused a mod_counter update */

	int     parity_good;    /* !0 if parity is known to be correct */
	int     serial_number;  /* a "serial number" for this set */
	int     mod_counter;    /* modification counter for component labels */
	int     clean;          /* the clean bit for this array. */

	int     openings;       /* Number of IO's which can be scheduled
				   simultaneously (high-level - not a 
				   per-component limit)*/

	int maxOutstanding;   /* maxOutstanding requests (per-component) */
	int autoconfigure;    /* automatically configure this RAID set. 
				 0 == no, 1 == yes */
	int root_partition;   /* Use this set as /
				 0 == no, 1 == yes*/
	int last_unit;        /* last unit number (e.g. 0 for /dev/raid0) 
				 of this component.  Used for autoconfigure
				 only. */
	int config_order;     /* 0 .. n.  The order in which the component
				 should be auto-configured.  E.g. 0 is will 
				 done first, (and would become raid0).
				 This may be in conflict with last_unit!!?! */
	                      /* Not currently used. */

	/* queue to gather up requests from KernelWakeupFunc() and let
	   a kernel thread deal with calling rf_DiskIOComplete and any
	   callback functions. */
	TAILQ_HEAD(iodone_q,RF_DiskQueueData_s) iodone; 
	/* and a lock to protect it */
	struct simplelock iodone_lock;

	/* DAG Node Pool - a pool that contains "arrays" of RF_DagNode_t's */
	struct pool dag_node_pool;

	/*
         * Cleanup stuff
         */
	RF_ShutdownList_t *shutdownList;	/* shutdown activities */
	RF_AllocListElem_t *cleanupList;	/* memory to be freed at
						 * shutdown time */

	/*
         * Recon stuff
         */
	RF_HeadSepLimit_t headSepLimit;
	int     numFloatingReconBufs;
	int     reconInProgress;
	        RF_DECLARE_COND(waitForReconCond)
	RF_RaidReconDesc_t *reconDesc;	/* reconstruction descriptor */
	RF_ReconCtrl_t *reconControl;	/* reconstruction control structure
					 * pointers for each row in the array */

	/*
         * Array-quiescence stuff
         */
	        RF_DECLARE_MUTEX(access_suspend_mutex)
	RF_IoCount_t accesses_suspended;
	RF_IoCount_t accs_in_flight;
	int     access_suspend_release;
	int     waiting_for_quiescence;
	RF_CallbackDesc_t *quiesce_wait_list;

	/*
         * Statistics
         */
#if !defined(_KERNEL) && !defined(SIMULATE)
	RF_ThroughputStats_t throughputstats;
#endif				/* !KERNEL && !SIMULATE */
	RF_CumulativeStats_t userstats;
	int     parity_rewrite_stripes_done;
	int     recon_stripes_done;
	int     copyback_stripes_done;

	int     recon_in_progress;
	int     parity_rewrite_in_progress;
	int     copyback_in_progress;
	int     adding_hot_spare;

	/*
         * Engine thread control
         */
	        RF_DECLARE_MUTEX(node_queue_mutex)
	RF_DagNode_t *node_queue;
	RF_Thread_t parity_rewrite_thread;
	RF_Thread_t copyback_thread;
	RF_Thread_t engine_thread;
	RF_Thread_t engine_helper_thread;
	RF_Thread_t recon_thread;
	int     shutdown_engine;
	int     shutdown_raidio;
	int     dags_in_flight;	/* debug */

	/*
         * PSS (Parity Stripe Status) stuff
         */
	long    pssTableSize;
	struct pool pss_pool;
	struct pool pss_issued_pool;

	/*
         * Reconstruction stuff
         */
	int     procsInBufWait;
	int     numFullReconBuffers;
	RF_AccTraceEntry_t *recon_tracerecs;
	unsigned long accumXorTimeUs;

	/*
         * nAccOutstanding, waitShutdown protected by desc freelist lock
         * (This may seem strange, since that's a central serialization point
         * for a per-array piece of data, but otherwise, it'd be an extra
         * per-array lock, and that'd only be less efficient...)
         */
	        RF_DECLARE_COND(outstandingCond)
	int     waitShutdown;
	int     nAccOutstanding;

	RF_DiskId_t **diskids;

	int     raidid;
	RF_AccTotals_t acc_totals;
	int     keep_acc_totals;

	struct raidcinfo *raid_cinfo;	/* array of component info */

	int     terminate_disk_queues;

	/*
         * XXX
         *
         * config-specific information should be moved
         * somewhere else, or at least hung off this
         * in some generic way
         */
#if RF_INCLUDE_CHAINDECLUSTER > 0

	/* used by rf_compute_workload_shift */
	RF_RowCol_t hist_diskreq[RF_MAXCOL];
#endif
	/* used by declustering */
	int     noRotate;

#if RF_INCLUDE_PARITYLOGGING > 0
	/* used by parity logging */
	RF_SectorCount_t regionLogCapacity;
	RF_ParityLogQueue_t parityLogPool;	/* pool of unused parity logs */
	RF_RegionInfo_t *regionInfo;	/* array of region state */
	int     numParityLogs;
	int     numSectorsPerLog;
	int     regionParityRange;
	int     logsInUse;	/* debugging */
	RF_ParityLogDiskQueue_t parityLogDiskQueue;	/* state of parity
							 * logging disk work */
	RF_RegionBufferQueue_t regionBufferPool;	/* buffers for holding
							 * region log */
	RF_RegionBufferQueue_t parityBufferPool;	/* buffers for holding
							 * parity */
	caddr_t parityLogBufferHeap;	/* pool of unused parity logs */
	RF_Thread_t pLogDiskThreadHandle;

#endif				/* RF_INCLUDE_PARITYLOGGING > 0 */
};
#endif				/* !_RF__RF_RAID_H_ */