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Ignore whitespace Rev 37 → Rev 38

/shark/trunk/kernel/modules/edf.c
20,11 → 20,11
 
/**
------------
CVS : $Id: edf.c,v 1.3 2002-11-11 08:32:06 pj Exp $
CVS : $Id: edf.c,v 1.4 2003-01-07 17:07:50 pj Exp $
 
File: $File$
Revision: $Revision: 1.3 $
Last update: $Date: 2002-11-11 08:32:06 $
Revision: $Revision: 1.4 $
Last update: $Date: 2003-01-07 17:07:50 $
------------
 
This file contains the scheduling module EDF (Earliest Deadline First)
34,7 → 34,7
**/
 
/*
* Copyright (C) 2000 Paolo Gai
* Copyright (C) 2000,2002 Paolo Gai
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
62,8 → 62,8
#include <kernel/func.h>
#include <kernel/trace.h>
 
//#define edf_printf kern_printf
#define edf_printf printk
//#define EDFDEBUG
#define edf_printf kern_printf
 
/*+ Status used in the level +*/
#define EDF_READY MODULE_STATUS_BASE /*+ - Ready status +*/
98,21 → 98,6
} EDF_level_des;
 
 
static char *EDF_status_to_a(WORD status)
{
if (status < MODULE_STATUS_BASE)
return status_to_a(status);
 
switch (status) {
case EDF_READY : return "EDF_Ready";
case EDF_WCET_VIOLATED: return "EDF_Wcet_Violated";
case EDF_WAIT : return "EDF_Sporadic_Wait";
case EDF_IDLE : return "EDF_Idle";
case EDF_ZOMBIE : return "EDF_Zombie";
default : return "EDF_Unknown";
}
}
 
static void EDF_timer_deadline(void *par)
{
PID p = (PID) par;
119,7 → 104,9
EDF_level_des *lev;
struct timespec *temp;
 
#ifdef EDFDEBUG
edf_printf("$");
#endif
 
lev = (EDF_level_des *)level_table[proc_table[p].task_level];
 
137,8 → 124,6
trc_logevent(TRC_INTACTIVATION,&p);
/* similar to EDF_task_activate */
temp = iq_query_timespec(p,&lev->ready);
TIMESPEC_ASSIGN(&proc_table[p].request_time,
temp);
ADDUSEC2TIMESPEC(lev->period[p], temp);
proc_table[p].status = EDF_READY;
iq_timespec_insert(p,&lev->ready);
145,10 → 130,10
lev->deadline_timer[p] = kern_event_post(temp,
EDF_timer_deadline,
(void *)p);
#ifdef EDFDEBUG
edf_printf("(dline p%d ev%d %d.%d)",(int)p,(int)lev->deadline_timer[p],(int)temp->tv_sec,(int)temp->tv_nsec/1000);
//printk("(d%d idle priority set to %d)",p,proc_table[p].priority );
#endif
event_need_reschedule();
printk("el%d|",p);
break;
 
case EDF_WAIT:
158,8 → 143,10
 
default:
/* else, a deadline miss occurred!!! */
#ifdef EDFDEBUG
edf_printf("\nstatus %d\n", (int)proc_table[p].status);
edf_printf("timer_deadline:AAARRRGGGHHH!!!");
#endif
kern_raise(XDEADLINE_MISS,p);
}
}
168,99 → 155,26
{
PID p = (PID) par;
 
#ifdef EDFDEBUG
edf_printf("AAARRRGGGHHH!!!");
#endif
kern_raise(XDEADLINE_MISS,p);
}
 
static int EDF_level_accept_task_model(LEVEL l, TASK_MODEL *m)
/* The scheduler only gets the first task in the queue */
static PID EDF_public_scheduler(LEVEL l)
{
if (m->pclass == HARD_PCLASS || m->pclass == (HARD_PCLASS | l)) {
HARD_TASK_MODEL *h = (HARD_TASK_MODEL *)m;
 
if (h->wcet && h->mit)
return 0;
}
 
return -1;
}
 
static int EDF_level_accept_guest_model(LEVEL l, TASK_MODEL *m)
{
if (m->pclass == JOB_PCLASS || m->pclass == (JOB_PCLASS | l))
return 0;
else
return -1;
}
 
 
static char *onoff(int i)
{
if (i)
return "On ";
else
return "Off";
}
 
static void EDF_level_status(LEVEL l)
{
EDF_level_des *lev = (EDF_level_des *)(level_table[l]);
PID p = iq_query_first(&lev->ready);
 
kern_printf("Wcet Check : %s\n",
onoff(lev->flags & EDF_ENABLE_WCET_CHECK));
kern_printf("On-line guarantee : %s\n",
onoff(lev->flags & EDF_ENABLE_GUARANTEE));
kern_printf("Used Bandwidth : %u/%u\n",
lev->U, MAX_BANDWIDTH);
#ifdef EDFDEBUG
edf_printf("(s%d)", iq_query_first(&lev->ready));
#endif
 
while (p != NIL) {
if ((proc_table[p].pclass) == JOB_PCLASS)
kern_printf("Pid: %2d (GUEST)\n", p);
else
kern_printf("Pid: %2d Name: %10s %s: %9ld Dline: %9ld.%6ld Stat: %s\n",
p,
proc_table[p].name,
lev->flag[p] & EDF_FLAG_SPORADIC ? "MinITime" : "Period ",
lev->period[p],
iq_query_timespec(p, &lev->ready)->tv_sec,
iq_query_timespec(p, &lev->ready)->tv_nsec/1000,
EDF_status_to_a(proc_table[p].status));
p = iq_query_next(p, &lev->ready);
}
 
for (p=0; p<MAX_PROC; p++)
if (proc_table[p].task_level == l && proc_table[p].status != EDF_READY
&& proc_table[p].status != FREE )
kern_printf("Pid: %2d Name: %10s %s: %9ld Dline: %9ld.%6ld Stat: %s\n",
p,
proc_table[p].name,
lev->flag[p] & EDF_FLAG_SPORADIC ? "MinITime" : "Period ",
lev->period[p],
iq_query_timespec(p, &lev->ready)->tv_sec,
iq_query_timespec(p, &lev->ready)->tv_nsec/1000,
EDF_status_to_a(proc_table[p].status));
}
 
/* The scheduler only gets the first task in the queue */
static PID EDF_level_scheduler(LEVEL l)
{
EDF_level_des *lev = (EDF_level_des *)(level_table[l]);
 
/* { // print 4 dbg the ready queue
PID p= lev->ready;
kern_printf("(s");
while (p != NIL) {
kern_printf("%d ",p);
p = proc_table[p].next;
}
kern_printf(") ");
}
*/
return iq_query_first(&lev->ready);
}
 
/* The on-line guarantee is enabled only if the appropriate flag is set... */
static int EDF_level_guarantee(LEVEL l, bandwidth_t *freebandwidth)
static int EDF_public_guarantee(LEVEL l, bandwidth_t *freebandwidth)
{
EDF_level_des *lev = (EDF_level_des *)(level_table[l]);
 
278,14 → 192,20
 
}
 
static int EDF_task_create(LEVEL l, PID p, TASK_MODEL *m)
static int EDF_public_create(LEVEL l, PID p, TASK_MODEL *m)
{
EDF_level_des *lev = (EDF_level_des *)(level_table[l]);
HARD_TASK_MODEL *h;
 
/* if the EDF_task_create is called, then the pclass must be a
valid pclass. */
if (m->pclass != HARD_PCLASS) return -1;
if (m->level != 0 && m->level != l) return -1;
h = (HARD_TASK_MODEL *)m;
if (!h->wcet || !h->mit) return -1;
/* now we know that m is a valid model */
 
HARD_TASK_MODEL *h = (HARD_TASK_MODEL *)m;
#ifdef EDFDEBUG
edf_printf("(cr%d)", p);
#endif
 
lev->period[p] = h->mit;
 
329,7 → 249,7
return 0; /* OK, also if the task cannot be guaranteed... */
}
 
static void EDF_task_detach(LEVEL l, PID p)
static void EDF_public_detach(LEVEL l, PID p)
{
/* the EDF level doesn't introduce any dinamic allocated new field.
we have only to reset the NO_GUARANTEE FIELD and decrement the allocated
337,6 → 257,10
 
EDF_level_des *lev = (EDF_level_des *)(level_table[l]);
 
#ifdef EDFDEBUG
edf_printf("(det%d)", p);
#endif
 
if (lev->flags & EDF_FAILED_GUARANTEE)
lev->flags &= ~EDF_FAILED_GUARANTEE;
else
343,16 → 267,13
lev->U -= (MAX_BANDWIDTH / lev->period[p]) * proc_table[p].wcet;
}
 
static int EDF_task_eligible(LEVEL l, PID p)
static void EDF_public_dispatch(LEVEL l, PID p, int nostop)
{
return 0; /* if the task p is chosen, it is always eligible */
}
 
static void EDF_task_dispatch(LEVEL l, PID p, int nostop)
{
EDF_level_des *lev = (EDF_level_des *)(level_table[l]);
 
#ifdef EDFDEBUG
edf_printf("(disp p%d %d.%d)",(int)p,(int)schedule_time.tv_sec,(int)schedule_time.tv_nsec/1000);
#endif
 
/* the task state is set EXE by the scheduler()
we extract the task from the ready queue
360,11 → 281,13
iq_extract(p, &lev->ready);
}
 
static void EDF_task_epilogue(LEVEL l, PID p)
static void EDF_public_epilogue(LEVEL l, PID p)
{
EDF_level_des *lev = (EDF_level_des *)(level_table[l]);
 
#ifdef EDFDEBUG
edf_printf("(epil p%d %d.%d)",p,(int)schedule_time.tv_sec,(int)schedule_time.tv_nsec/1000);
#endif
 
/* check if the wcet is finished... */
if ((lev->flags & EDF_ENABLE_WCET_CHECK) && proc_table[p].avail_time <= 0) {
379,11 → 302,15
}
}
 
static void EDF_task_activate(LEVEL l, PID p)
static void EDF_public_activate(LEVEL l, PID p)
{
EDF_level_des *lev = (EDF_level_des *)(level_table[l]);
struct timespec *temp;
 
#ifdef EDFDEBUG
edf_printf("(act%d)", p);
#endif
 
if (proc_table[p].status == EDF_WAIT) {
kern_raise(XACTIVATION,p);
return;
397,10 → 324,8
 
 
/* see also EDF_timer_deadline */
ll_gettime(TIME_EXACT, &proc_table[p].request_time);
 
temp = iq_query_timespec(p, &lev->ready);
TIMESPEC_ASSIGN(temp, &proc_table[p].request_time);
kern_gettime(temp);
ADDUSEC2TIMESPEC(lev->period[p], temp);
 
/* Insert task in the correct position */
411,15 → 336,17
lev->deadline_timer[p] = kern_event_post(temp,
EDF_timer_deadline,
(void *)p);
#ifdef EDFDEBUG
edf_printf("(dline p%d ev%d %d.%d)",p,(int)lev->deadline_timer[p],(int)temp->tv_sec,(int)temp->tv_nsec/1000);
#endif
}
 
static void EDF_task_insert(LEVEL l, PID p)
static void EDF_public_unblock(LEVEL l, PID p)
{
EDF_level_des *lev = (EDF_level_des *)(level_table[l]);
 
/* Similar to EDF_task_activate, but we don't check in what state
the task is and we don't set the request_time*/
/* Similar to EDF_task_activate,
but we don't check in what state the task is */
 
/* Insert task in the coEDFect position */
proc_table[p].status = EDF_READY;
426,7 → 353,7
iq_timespec_insert(p,&lev->ready);
}
 
static void EDF_task_extract(LEVEL l, PID p)
static void EDF_public_block(LEVEL l, PID p)
{
/* Extract the running task from the level
. we have already extract it from the ready queue at the dispatch time.
439,30 → 366,35
*/
}
 
static void EDF_task_endcycle(LEVEL l, PID p)
static int EDF_public_message(LEVEL l, PID p, void *m)
{
EDF_level_des *lev = (EDF_level_des *)(level_table[l]);
 
#ifdef EDFDEBUG
edf_printf("(ecyc p%d %d.%d)",p,(int)schedule_time.tv_sec,(int)schedule_time.tv_nsec/1000);
#endif
 
/* the task has terminated his job before it consume the wcet. All OK! */
if (lev->flag[p] & EDF_FLAG_SPORADIC)
if (!lev->flag[p] & EDF_FLAG_SPORADIC)
proc_table[p].status = EDF_IDLE;
else
proc_table[p].status = EDF_WAIT;
else /* pclass = sporadic_pclass */
proc_table[p].status = EDF_IDLE;
 
/* we reset the capacity counters... */
if (lev->flags & EDF_ENABLE_WCET_CHECK)
proc_table[p].avail_time = proc_table[p].wcet;
 
jet_update_endcycle(); /* Update the Jet data... */
trc_logevent(TRC_ENDCYCLE,&exec_shadow); /* tracer stuff */
 
/* when the deadline timer fire, it recognize the situation and set
correctly all the stuffs (like reactivation, request_time, etc... ) */
correctly all the stuffs (like reactivation, sleep, etc... ) */
 
return 0;
}
 
static void EDF_task_end(LEVEL l, PID p)
static void EDF_public_end(LEVEL l, PID p)
{
// EDF_level_des *lev = (EDF_level_des *)(level_table[l]);
 
proc_table[p].status = EDF_ZOMBIE;
 
/* When the deadline timer fire, it put the task descriptor in
469,60 → 401,40
the free queue, and free the allocated bandwidth... */
}
 
static void EDF_task_sleep(LEVEL l, PID p)
static void EDF_private_insert(LEVEL l, PID p, TASK_MODEL *m)
{
EDF_level_des *lev = (EDF_level_des *)(level_table[l]);
JOB_TASK_MODEL *job;
 
/* the task has terminated his job before it consume the wcet. All OK! */
proc_table[p].status = EDF_WAIT;
if (m->pclass != JOB_PCLASS || (m->level != 0 && m->level != l) ) {
kern_raise(XINVALID_TASK, p);
return;
}
 
/* we reset the capacity counters... */
if (lev->flags & EDF_ENABLE_WCET_CHECK)
proc_table[p].avail_time = proc_table[p].wcet;
job = (JOB_TASK_MODEL *)m;
 
/* when the deadline timer fire, it recognize the situation and set
correctly the task state to sleep... */
}
 
 
/* Guest Functions
These functions manages a JOB_TASK_MODEL, that is used to put
a guest task in the EDF ready queue. */
 
static int EDF_guest_create(LEVEL l, PID p, TASK_MODEL *m)
{
EDF_level_des *lev = (EDF_level_des *)(level_table[l]);
JOB_TASK_MODEL *job = (JOB_TASK_MODEL *)m;
 
/* if the EDF_guest_create is called, then the pclass must be a
valid pclass. */
 
/* Insert task in the correct position */
*iq_query_timespec(p, &lev->ready) = job->deadline;
iq_timespec_insert(p,&lev->ready);
proc_table[p].status = EDF_READY;
lev->deadline_timer[p] = -1;
 
if (job->noraiseexc)
lev->period[p] = job->period;
 
/* Set the deadline timer */
if (!(job->noraiseexc))
lev->flag[p] = EDF_FLAG_NORAISEEXC;
else
else {
lev->flag[p] = 0;
 
lev->period[p] = job->period;
 
/* there is no bandwidth guarantee at this level, it is performed
by the level that inserts guest tasks... */
 
return 0; /* OK, also if the task cannot be guaranteed... */
lev->deadline_timer[p] = kern_event_post(iq_query_timespec(p, &lev->ready),
EDF_timer_guest_deadline,
(void *)p);
}
}
 
static void EDF_guest_detach(LEVEL l, PID p)
static void EDF_private_dispatch(LEVEL l, PID p, int nostop)
{
/* the EDF level doesn't introduce any dinamic allocated new field.
No guarantee is performed on guest tasks... so we don't have to reset
the NO_GUARANTEE FIELD */
}
 
static void EDF_guest_dispatch(LEVEL l, PID p, int nostop)
{
EDF_level_des *lev = (EDF_level_des *)(level_table[l]);
 
/* the task state is set to EXE by the scheduler()
531,7 → 443,7
iq_extract(p, &lev->ready);
}
 
static void EDF_guest_epilogue(LEVEL l, PID p)
static void EDF_private_epilogue(LEVEL l, PID p)
{
EDF_level_des *lev = (EDF_level_des *)(level_table[l]);
 
540,75 → 452,30
proc_table[p].status = EDF_READY;
}
 
static void EDF_guest_activate(LEVEL l, PID p)
static void EDF_private_extract(LEVEL l, PID p)
{
EDF_level_des *lev = (EDF_level_des *)(level_table[l]);
 
/* Insert task in the correct position */
iq_timespec_insert(p,&lev->ready);
proc_table[p].status = EDF_READY;
 
/* Set the deadline timer */
if (!(lev->flag[p] & EDF_FLAG_NORAISEEXC))
lev->deadline_timer[p] = kern_event_post(iq_query_timespec(p, &lev->ready),
EDF_timer_guest_deadline,
(void *)p);
 
}
 
static void EDF_guest_insert(LEVEL l, PID p)
{
EDF_level_des *lev = (EDF_level_des *)(level_table[l]);
 
/* Insert task in the correct position */
iq_timespec_insert(p,&lev->ready);
proc_table[p].status = EDF_READY;
}
 
static void EDF_guest_extract(LEVEL l, PID p)
{
/* Extract the running task from the level
. we have already extract it from the ready queue at the dispatch time.
. the state of the task is set by the calling function
. the deadline must remain...
 
So, we do nothing!!!
*/
}
 
static void EDF_guest_endcycle(LEVEL l, PID p)
{ kern_raise(XINVALID_GUEST,exec_shadow); }
 
static void EDF_guest_end(LEVEL l, PID p)
{
EDF_level_des *lev = (EDF_level_des *)(level_table[l]);
 
//kern_printf("EDF_guest_end: dline timer %d\n",lev->deadline_timer[p]);
#ifdef EDFDEBUG
edf_printf("EDF_guest_end: dline timer %d\n",lev->deadline_timer[p]);
#endif
if (proc_table[p].status == EDF_READY)
{
iq_extract(p, &lev->ready);
//kern_printf("(g_end rdy extr)");
}
 
/* we remove the deadline timer, because the slice is finished */
if (lev->deadline_timer[p] != NIL) {
// kern_printf("EDF_guest_end: dline timer %d\n",lev->deadline_timer[p]);
event_delete(lev->deadline_timer[p]);
kern_event_delete(lev->deadline_timer[p]);
lev->deadline_timer[p] = NIL;
}
 
}
 
static void EDF_guest_sleep(LEVEL l, PID p)
{ kern_raise(XINVALID_GUEST,exec_shadow); }
 
 
 
/* Registration functions */
 
/*+ Registration function:
int flags the init flags ... see edf.h +*/
void EDF_register_level(int flags)
LEVEL EDF_register_level(int flags)
{
LEVEL l; /* the level that we register */
EDF_level_des *lev; /* for readableness only */
617,56 → 484,34
printk("EDF_register_level\n");
 
/* request an entry in the level_table */
l = level_alloc_descriptor();
l = level_alloc_descriptor(sizeof(EDF_level_des));
 
printk(" alloco descrittore %d %d\n",l,(int)sizeof(EDF_level_des));
lev = (EDF_level_des *)level_table[l];
 
/* alloc the space needed for the EDF_level_des */
lev = (EDF_level_des *)kern_alloc(sizeof(EDF_level_des));
 
printk(" lev=%d\n",(int)lev);
 
/* update the level_table with the new entry */
level_table[l] = (level_des *)lev;
 
/* fill the standard descriptor */
strncpy(lev->l.level_name, EDF_LEVELNAME, MAX_LEVELNAME);
lev->l.level_code = EDF_LEVEL_CODE;
lev->l.level_version = EDF_LEVEL_VERSION;
lev->l.private_insert = EDF_private_insert;
lev->l.private_extract = EDF_private_extract;
lev->l.private_dispatch = EDF_private_dispatch;
lev->l.private_epilogue = EDF_private_epilogue;
 
lev->l.level_accept_task_model = EDF_level_accept_task_model;
lev->l.level_accept_guest_model = EDF_level_accept_guest_model;
lev->l.level_status = EDF_level_status;
lev->l.level_scheduler = EDF_level_scheduler;
 
lev->l.public_scheduler = EDF_public_scheduler;
if (flags & EDF_ENABLE_GUARANTEE)
lev->l.level_guarantee = EDF_level_guarantee;
lev->l.public_guarantee = EDF_public_guarantee;
else
lev->l.level_guarantee = NULL;
lev->l.public_guarantee = NULL;
 
lev->l.task_create = EDF_task_create;
lev->l.task_detach = EDF_task_detach;
lev->l.task_eligible = EDF_task_eligible;
lev->l.task_dispatch = EDF_task_dispatch;
lev->l.task_epilogue = EDF_task_epilogue;
lev->l.task_activate = EDF_task_activate;
lev->l.task_insert = EDF_task_insert;
lev->l.task_extract = EDF_task_extract;
lev->l.task_endcycle = EDF_task_endcycle;
lev->l.task_end = EDF_task_end;
lev->l.task_sleep = EDF_task_sleep;
lev->l.public_create = EDF_public_create;
lev->l.public_detach = EDF_public_detach;
lev->l.public_end = EDF_public_end;
lev->l.public_dispatch = EDF_public_dispatch;
lev->l.public_epilogue = EDF_public_epilogue;
lev->l.public_activate = EDF_public_activate;
lev->l.public_unblock = EDF_public_unblock;
lev->l.public_block = EDF_public_block;
lev->l.public_message = EDF_public_message;
 
lev->l.guest_create = EDF_guest_create;
lev->l.guest_detach = EDF_guest_detach;
lev->l.guest_dispatch = EDF_guest_dispatch;
lev->l.guest_epilogue = EDF_guest_epilogue;
lev->l.guest_activate = EDF_guest_activate;
lev->l.guest_insert = EDF_guest_insert;
lev->l.guest_extract = EDF_guest_extract;
lev->l.guest_endcycle = EDF_guest_endcycle;
lev->l.guest_end = EDF_guest_end;
lev->l.guest_sleep = EDF_guest_sleep;
 
/* fill the EDF descriptor part */
for(i=0; i<MAX_PROC; i++) {
lev->period[i] = 0;
677,15 → 522,14
iq_init(&lev->ready, &freedesc, 0);
lev->flags = flags & 0x07;
lev->U = 0;
 
return l;
}
 
bandwidth_t EDF_usedbandwidth(LEVEL l)
{
EDF_level_des *lev = (EDF_level_des *)(level_table[l]);
if (lev->l.level_code == EDF_LEVEL_CODE &&
lev->l.level_version == EDF_LEVEL_VERSION)
return lev->U;
else
return 0;
 
return lev->U;
}