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      1 /*	$NetBSD: rf_mcpair.c,v 1.25 2021/07/23 00:54:45 oster Exp $	*/
      2 /*
      3  * Copyright (c) 1995 Carnegie-Mellon University.
      4  * All rights reserved.
      5  *
      6  * Author: Jim Zelenka
      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 /* rf_mcpair.c
     30  * an mcpair is a structure containing a mutex and a condition variable.
     31  * it's used to block the current thread until some event occurs.
     32  */
     33 
     34 #include <sys/cdefs.h>
     35 __KERNEL_RCSID(0, "$NetBSD: rf_mcpair.c,v 1.25 2021/07/23 00:54:45 oster Exp $");
     36 
     37 #include <dev/raidframe/raidframevar.h>
     38 
     39 #include "rf_archs.h"
     40 #include "rf_threadstuff.h"
     41 #include "rf_mcpair.h"
     42 #include "rf_debugMem.h"
     43 #include "rf_general.h"
     44 #include "rf_shutdown.h"
     45 #include "rf_netbsd.h"
     46 #include "rf_raid.h"
     47 
     48 #include <sys/pool.h>
     49 #include <sys/proc.h>
     50 
     51 #define RF_MAX_FREE_MCPAIR 128
     52 #define RF_MIN_FREE_MCPAIR  24
     53 
     54 static void rf_ShutdownMCPair(void *);
     55 
     56 static void
     57 rf_ShutdownMCPair(void *arg)
     58 {
     59 	RF_Raid_t *raidPtr;
     60 
     61 	raidPtr = (RF_Raid_t *) arg;
     62 
     63 	pool_destroy(&raidPtr->pools.mcpair);
     64 }
     65 
     66 int
     67 rf_ConfigureMCPair(RF_ShutdownList_t **listp, RF_Raid_t *raidPtr,
     68 		   RF_Config_t *cfgPtr)
     69 {
     70 
     71 	rf_pool_init(raidPtr, raidPtr->poolNames.mcpair, &raidPtr->pools.mcpair, sizeof(RF_MCPair_t),
     72 		     "mcpair", RF_MIN_FREE_MCPAIR, RF_MAX_FREE_MCPAIR);
     73 	rf_ShutdownCreate(listp, rf_ShutdownMCPair, raidPtr);
     74 
     75 	return (0);
     76 }
     77 
     78 RF_MCPair_t *
     79 rf_AllocMCPair(RF_Raid_t *raidPtr)
     80 {
     81 	RF_MCPair_t *t;
     82 
     83 	t = pool_get(&raidPtr->pools.mcpair, PR_WAITOK);
     84 	rf_init_mutex2(t->mutex, IPL_VM);
     85 	rf_init_cond2(t->cond, "mcpair");
     86 	t->flag = 0;
     87 
     88 	return (t);
     89 }
     90 
     91 void
     92 rf_FreeMCPair(RF_Raid_t *raidPtr, RF_MCPair_t *t)
     93 {
     94 	rf_destroy_cond2(t->cond);
     95 	rf_destroy_mutex2(t->mutex);
     96 	pool_put(&raidPtr->pools.mcpair, t);
     97 }
     98 
     99 /* the callback function used to wake you up when you use an mcpair to
    100    wait for something */
    101 void
    102 rf_MCPairWakeupFunc(RF_MCPair_t *mcpair)
    103 {
    104 	RF_LOCK_MCPAIR(mcpair);
    105 	mcpair->flag = 1;
    106 	rf_broadcast_cond2(mcpair->cond);
    107 	RF_UNLOCK_MCPAIR(mcpair);
    108 }
    109