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ssd_event.c
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ssd_event.c
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/* Copyright 2009, 20 Brendan Tauras */
/* ssd_event.cpp is part of FlashSim. */
/* FlashSim is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version. */
/* FlashSim is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details. */
/* You should have received a copy of the GNU General Public License
* along with FlashSim. If not, see <http://www.gnu.org/licenses/>. */
/****************************************************************************/
/* Event class
* Brendan Tauras 20-07-16
*
* Class to manage I/O requests as events for the SSD. It was designed to keep
* track of an I/O request by storing its type, addressing, and timing. The
* SSD class creates an instance for each I/O request it receives.
*/
#include "ssd.h"
Event *ssd_event_init (Event *obj, enum event_type type, ulong logical_address, uint size, int64 start_time)
{
assert(start_time >= 0);
obj->start_time = start_time;
obj->time_taken = 0;
obj->bus_wait_time = 0;
obj->type = type;
obj->logical_address = logical_address;
obj->size = size;
obj->next = NULL;
return obj;
}
#if 0
/* see "enum event_type" in ssd.h for details on event types */
Event *ssd_event_new (enum event_type type, ulong logical_address, uint size, int64 start_time)
{
SSD_NEW(Event);
return ssd_event_init (obj, type, logical_address, size, start_time);
}
void ssd_event_free (Event *e)
{
ssd_free (e);
}
/* find the last event in the list to finish and use that event's finish time
* to calculate time_taken
* add bus_wait_time for all events in the list to bus_wait_time
* all events in the list do not need to start at the same time
* bus_wait_time can potentially exceed time_taken with long event lists
* because bus_wait_time is a sum while time_taken is a max
* be careful to only call this method once when the metaevent is finished */
void ssd_event_consolidate_metaevent(Event *e, Event *list)
{
Event *cur;
int64 max;
int64 tmp;
assert(e->start_time >= 0);
/* find max time taken with respect to this event's start_time */
max = e->start_time - list->start_time + list->time_taken;
for(cur = list->next; cur != NULL; cur = cur->next)
{
tmp = e->start_time - cur->start_time + cur->time_taken;
if(tmp > max)
max = tmp;
e->bus_wait_time += ssd_event_get_bus_wait_time(cur);
}
e->time_taken = max;
assert(e->time_taken >= 0);
assert(e->bus_wait_time >= 0);
return;
}
ulong ssd_event_get_logical_address(Event *e)
{
return e->logical_address;
}
uint ssd_event_get_size(Event *e)
{
return e->size;
}
int64 ssd_event_get_bus_wait_time(Event *e)
{
assert(e->bus_wait_time >= 0);
return e->bus_wait_time;
}
Event *ssd_event_get_next(Event *e)
{
return e->next;
}
void ssd_event_set_merge_address(Event *e, const Address *address)
{
e->merge_address = *address;
}
void ssd_event_set_next(Event *e, Event *next)
{
e->next = next;
}
#endif
const Address *ssd_event_get_address(Event *e)
{
return &e->address;
}
const Address *ssd_event_get_merge_address(Event *e)
{
return &e->merge_address;
}
enum event_type ssd_event_get_event_type(Event *e)
{
return e->type;
}
int64 ssd_event_get_start_time(Event *e)
{
assert(e->start_time >= 0);
return e->start_time;
}
int64 ssd_event_get_time_taken(Event *e)
{
assert(e->time_taken >= 0);
return e->time_taken;
}
void ssd_event_set_address(Event *e, const Address *address)
{
e->address = *address;
}
int64 ssd_event_incr_bus_wait_time(Event *e, int64 time_incr)
{
if(time_incr > 0)
e->bus_wait_time += time_incr;
return e->bus_wait_time;
}
int64 ssd_event_incr_time_taken(Event *e, int64 time_incr)
{
if(time_incr > 0)
e->time_taken += time_incr;
return e->time_taken;
}
void ssd_event_print(Event *e)
{
char buf[512];
char *p;
Address *a = &e->address;
int len = 0;
uint ppn;
if(e->type == SSD_READ)
p = "Read ";
else if(e->type == SSD_WRITE)
p = "Write";
else if(e->type == SSD_ERASE)
p = "Erase";
else if(e->type == SSD_MERGE)
p = "Merge";
else
p = "Unknown event type: ";
ppn = ((((((a->package * PACKAGE_SIZE) + a->die) * DIE_SIZE) +a->plane) *PLANE_SIZE) +a->block)*SSD_BLOCK_SIZE +a->page;
len = snprintf(buf, sizeof(buf)-1, "%s", p);
len += snprintf(buf+len, sizeof(buf)-len-1, "(%d, %d, %d, %d, %d, %d)", a->package, a->die, a->plane, a->block, a->page, (int) a->valid);
//ssd_address_print (&e->address);
if(e->type == SSD_MERGE)
ssd_address_print (&e->merge_address);
SSD_ERROR("%s ppn=%u %lu Time %"FMT_64"[%"FMT_64", %"FMT_64") Bus_wait: %"FMT_64"\n", buf, ppn, e->logical_address, e->time_taken, e->start_time, e->start_time + e->time_taken, e->bus_wait_time);
}
#if 0
/* may be useful for further integration with DiskSim */
/* caution: copies pointers from rhs */
ioreq_event &ssd_event_operator= (const ioreq_event &rhs)
{
assert(&rhs != NULL);
if((const ioreq_event *) &rhs == (const ioreq_event *) &(this->ioreq))
return *(this->ioreq);
ioreq->time = rhs.time;
ioreq->type = rhs.type;
ioreq->next = rhs.next;
ioreq->prev = rhs.prev;
ioreq->bcount = rhs.bcount;
ioreq->blkno = rhs.blkno;
ioreq->flags = rhs.flags;
ioreq->busno = rhs.busno;
ioreq->slotno = rhs.slotno;
ioreq->devno = rhs.devno;
ioreq->opid = rhs.opid;
ioreq->buf = rhs.buf;
ioreq->cause = rhs.cause;
ioreq->tempint1 = rhs.tempint1;
ioreq->tempint2 = rhs.tempint2;
ioreq->tempptr1 = rhs.tempptr1;
ioreq->tempptr2 = rhs.tempptr2;
ioreq->mems_sled = rhs.mems_sled;
ioreq->mems_reqinfo = rhs.mems_reqinfo;
ioreq->start_time = rhs.start_time;
ioreq->batchno = rhs.batchno;
ioreq->batch_complete = rhs.batch_complete;
ioreq->batch_size = rhs.batch_size;
ioreq->batch_next = rhs.batch_next;
ioreq->batch_prev = rhs.batch_prev;
return *ioreq;
}
#endif