static void controller_smart_access_complete (controller *currctlr, ioreq_event *curr)
{
struct ioq *queue = currctlr->devices[curr->devno].queue;
ioreq_event *done = ioreq_copy(curr);
int devno = curr->devno;
int numout;
/* Responds to completion interrupt */
done->type = IO_INTERRUPT_COMPLETE;
currctlr->outbusowned = controller_get_downward_busno(currctlr, done, NULL);
controller_send_event_down_path(currctlr, done, currctlr->ovrhd_disk_complete);
currctlr->outbusowned = -1;
/* Handles request completion, including call-backs into cache */
curr = ioqueue_physical_access_done(queue, curr);
while ((done = curr)) {
curr = curr->next;
/* call back into cache with completion -- let it do request_complete */
controller_smart_wakeup(currctlr, currctlr->cache->cache_disk_access_complete(currctlr->cache, done));
}
/* Initiate another request, if any pending */
numout = ioqueue_get_reqoutstanding(queue);
if ((numout < currctlr->devices[devno].maxoutstanding) && (curr = ioqueue_get_next_request(queue))) {
controller_send_event_down_path(currctlr, curr, currctlr->ovrhd_disk_request);
}
}
static void ssd_access_complete_element(ioreq_event *curr)
{
ssd_t *currdisk;
int elem_num;
ssd_element *elem;
ioreq_event *x;
currdisk = getssd (curr->devno);
elem_num = currdisk->timing_t->choose_element(currdisk->timing_t, curr->blkno);
ASSERT(elem_num == curr->ssd_elem_num);
elem = &currdisk->elements[elem_num];
if ((x = ioqueue_physical_access_done(elem->queue,curr)) == NULL) {
fprintf(stderr, "ssd_access_complete: ioreq_event not found by ioqueue_physical_access_done call\n");
exit(1);
}
// all the reqs are over
if (ioqueue_get_reqoutstanding(elem->queue) == 0) {
elem->media_busy = FALSE;
}
ssd_complete_parent(curr, currdisk);
addtoextraq((event *) curr);
ssd_activate_elem(currdisk, elem_num);
}
static void simpledisk_request_arrive (ioreq_event *curr)
{
ioreq_event *intrp;
simpledisk_t *currdisk;
#ifdef DEBUG_SIMPLEDISK
fprintf (outputfile, "*** %f: simpledisk_request_arrive - devno %d, blkno %d, bcount %d, flags 0x%x\n", simtime, curr->devno, curr->blkno, curr->bcount, curr->flags );
#endif
currdisk = getsimpledisk(curr->devno);
/* verify that request is valid. */
if ((curr->blkno < 0) || (curr->bcount <= 0) ||
((curr->blkno + curr->bcount) > currdisk->numblocks)) {
fprintf(stderr, "Invalid set of blocks requested from simpledisk - blkno %lld, bcount %d, numblocks %lld\n", curr->blkno, curr->bcount, currdisk->numblocks);
exit(1);
}
/* create a new request, set it up for initial interrupt */
currdisk->busowned = simpledisk_get_busno(curr);
if (ioqueue_get_reqoutstanding (currdisk->queue) == 0) {
ioqueue_add_new_request(currdisk->queue, curr);
curr = ioqueue_get_next_request (currdisk->queue);
intrp = curr;
/* initiate media access if request is a READ */
if (curr->flags & READ) {
ioreq_event *tmp = ioreq_copy (curr);
currdisk->media_busy = TRUE;
stat_update (&currdisk->stat.acctimestats, currdisk->acctime);
tmp->time = simtime + currdisk->acctime;
tmp->type = DEVICE_ACCESS_COMPLETE;
addtointq ((event *)tmp);
}
/* if not disconnecting, then the READY_TO_TRANSFER is like a RECONNECT */
currdisk->reconnect_reason = IO_INTERRUPT_ARRIVE;
if (curr->flags & READ) {
intrp->cause = (currdisk->neverdisconnect) ? READY_TO_TRANSFER : DISCONNECT;
} else {
intrp->cause = READY_TO_TRANSFER;
}
} else {
intrp = ioreq_copy(curr);
ioqueue_add_new_request(currdisk->queue, curr);
intrp->cause = DISCONNECT;
}
intrp->type = IO_INTERRUPT_ARRIVE;
simpledisk_send_event_up_path(intrp, currdisk->bus_transaction_latency);
}
static void ssd_access_complete_element(ioreq_event *curr)
{
ssd_t *currdisk;
int elem_num;
ssd_element *elem;
ioreq_event *x;
int lba;
currdisk = getssd (curr->devno);
elem_num = ssd_choose_element(currdisk->user_params, curr->blkno);
ASSERT(elem_num == curr->ssd_elem_num);
elem = &currdisk->elements[elem_num];
lba = ssd_logical_pageno(curr->blkno, currdisk);
if(curr->flags & READ){
fprintf(outputfile5, "%10.6f %d %d %d\n", simtime, lba, elem_num, curr->blkno);
}
else {
fprintf(outputfile4, "%10.6f %d %d %d\n", simtime, lba, elem_num, curr->blkno);
}
if ((x = ioqueue_physical_access_done(elem->queue,curr)) == NULL) {
fprintf(stderr, "ssd_access_complete: ioreq_event not found by ioqueue_physical_access_done call\n");
exit(1);
}
ssd_dpower(currdisk, 0);
// all the reqs are over
if (ioqueue_get_reqoutstanding(elem->queue) == 0) {
elem->media_busy = FALSE;
}
ssd_complete_parent(curr, currdisk);
addtoextraq((event *) curr);
// added by tiel
// activate request create simtime, type, elem_num
//{
// ioreq_event *temp = (ioreq_event *)getfromextraq();
// temp->type = SSD_ACTIVATE_ELEM;
// temp->time = simtime + (2*currdisk->params.channel_switch_delay);
// //temp->time = simtime;
// temp->ssd_elem_num = elem_num;
// addtointq ((event *)temp);
//}
//printf("time %f \n",simtime);
ssd_activate_elem(currdisk, elem_num);
}
static void controller_smart_issue_access (void *issuefuncparam, ioreq_event *curr)
{
controller *currctlr = issuefuncparam;
struct ioq *queue = currctlr->devices[curr->devno].queue;
int numout = ioqueue_get_reqoutstanding(queue);
/* in case the cache changes to which device the request is sent */
//fprintf (stderr, "busno %x, buspath %x, slotno %x, slotpath %x\n", curr->busno, currctlr->devices[curr->devno].buspath.value, curr->slotno, currctlr->devices[curr->devno].slotpath.value);
curr->busno = currctlr->devices[curr->devno].buspath.value;
curr->slotno = currctlr->devices[curr->devno].slotpath.value;
ioqueue_add_new_request(queue, curr);
if (numout < currctlr->devices[curr->devno].maxoutstanding) {
ioreq_event *sched = ioqueue_get_next_request(queue);
controller_send_event_down_path(currctlr, sched, currctlr->ovrhd_disk_request);
}
}
static int check_send_out_request (iodriver *curriodriver, int devno)
{
int numout;
if ((curriodriver->consttime == IODRIVER_TRACED_QUEUE_TIMES) || (curriodriver->consttime == IODRIVER_TRACED_BOTH_TIMES)) {
return(FALSE);
}
numout = ioqueue_get_reqoutstanding(curriodriver->devices[devno].queue);
if (curriodriver->usequeue == TRUE) {
int queuectlr = curriodriver->devices[devno].queuectlr;
if (queuectlr != -1) {
numout = curriodriver->ctlrs[queuectlr].numoutstanding;
/*
fprintf (outputfile, "Check send_out_req: queuectlr %d, numout %d, maxout %d, send %d\n", queuectlr, numout, curriodriver->ctlrs[queuectlr].maxoutstanding, (numout < curriodriver->ctlrs[queuectlr].maxoutstanding));
*/
return(numout < curriodriver->ctlrs[queuectlr].maxoutstanding);
} else {
return(numout < curriodriver->devices[devno].maxoutstanding);
}
} else {
return(!numout);
}
}
static void ssd_access_complete_element(ioreq_event *curr)
{
ssd_t *currdisk;
int elem_num;
ssd_element *elem;
ioreq_event *x;
int lba;
currdisk = getssd (curr->devno);
elem_num = ssd_choose_element(currdisk->user_params, curr->blkno);
ASSERT(elem_num == curr->ssd_elem_num);
elem = &currdisk->elements[elem_num];
lba = ssd_logical_blockno(curr->blkno, currdisk);
if(curr->flags & READ){
fprintf(outputfile5, "%10.6f %d %d %d\n", simtime, lba, elem_num, curr->blkno);
}
else {
fprintf(outputfile4, "%10.6f %d %d %d\n", simtime, lba, elem_num, curr->blkno);
}
if ((x = ioqueue_physical_access_done(elem->queue,curr)) == NULL) {
fprintf(stderr, "ssd_access_complete: ioreq_event not found by ioqueue_physical_access_done call\n");
exit(1);
}
ssd_dpower(currdisk, 0);
// all the reqs are over
if (ioqueue_get_reqoutstanding(elem->queue) == 0) {
elem->media_busy = FALSE;
}
ssd_complete_parent(curr, currdisk);
addtoextraq((event *) curr);
ssd_activate_elem(currdisk, elem_num);
}
/*
* collects 1 request from each chip in the gang
*/
static void ssd_collect_req_in_gang
(ssd_t *s, int gang_num, ssd_req ***rd_q, ssd_req ***wr_q, int *rd_total, int *wr_total)
{
int i;
int start;
gang_metadata *g;
g = &s->gang_meta[gang_num];
// start from the first element of the gang
start = gang_num * s->params.elements_per_gang;
i = start;
*rd_total = 0;
*wr_total = 0;
do {
ssd_element *elem;
ioreq_event *req;
int tot_rd_reqs;
int tot_wr_reqs;
int j;
elem = &s->elements[i];
ASSERT(ioqueue_get_reqoutstanding(elem->queue) == 0);
j = i % s->params.elements_per_gang;
// collect the requests
tot_rd_reqs = 0;
tot_wr_reqs = 0;
if ((req = ioqueue_get_next_request(elem->queue)) != NULL) {
int found;
if (req->flags & READ) {
found = ssd_already_present(rd_q[j], tot_rd_reqs, req);
} else {
found = ssd_already_present(wr_q[j], tot_wr_reqs, req);
}
if (!found) {
// this is a valid request
ssd_req *r = malloc(sizeof(ssd_req));
r->blk = req->blkno;
r->count = req->bcount;
r->is_read = req->flags & READ;
r->org_req = req;
r->plane_num = -1; // we don't know to which plane this req will be directed at
if (req->flags & READ) {
rd_q[j][tot_rd_reqs] = r;
tot_rd_reqs ++;
} else {
wr_q[j][tot_wr_reqs] = r;
tot_wr_reqs ++;
}
} else {
// throw this request -- it doesn't make sense
stat_update (&s->stat.acctimestats, 0);
req->time = simtime;
req->ssd_elem_num = i;
req->ssd_gang_num = gang_num;
req->type = DEVICE_ACCESS_COMPLETE;
addtointq ((event *)req);
}
ASSERT((tot_rd_reqs < MAX_REQS) && (tot_wr_reqs < MAX_REQS))
}
*rd_total = *rd_total + tot_rd_reqs;
*wr_total = *wr_total + tot_wr_reqs;
// go to the next element
i = ssd_next_elem_in_gang(s, gang_num, i);
} while (i != start);
static void ssd_activate_elem(ssd_t *currdisk, int elem_num)
{
ioreq_event *req;
ssd_req **read_reqs;
ssd_req **write_reqs;
int i;
int read_total = 0;
int write_total = 0;
double schtime = 0;
int max_reqs;
int tot_reqs_issued;
double max_time_taken = 0;
ssd_element *elem = &currdisk->elements[elem_num];
// if the media is busy, we can't do anything, so return
if (elem->media_busy == TRUE) {
return;
}
ASSERT(ioqueue_get_reqoutstanding(elem->queue) == 0);
// we can invoke cleaning in the background whether there
// is request waiting or not
if (currdisk->params.cleaning_in_background) {
// if cleaning was invoked, wait until
// it is over ...
if (ssd_invoke_element_cleaning(elem_num, currdisk)) {
return;
}
}
ASSERT(elem->metadata.reqs_waiting == ioqueue_get_number_in_queue(elem->queue));
if (elem->metadata.reqs_waiting > 0) {
// invoke cleaning in foreground when there are requests waiting
if (!currdisk->params.cleaning_in_background) {
// if cleaning was invoked, wait until
// it is over ...
if (ssd_invoke_element_cleaning(elem_num, currdisk)) {
return;
}
}
// how many reqs can we issue at once
if (currdisk->params.copy_back == SSD_COPY_BACK_DISABLE) {
max_reqs = 1;
} else {
if (currdisk->params.num_parunits == 1) {
max_reqs = 1;
} else {
max_reqs = MAX_REQS_ELEM_QUEUE;
}
}
// ideally, we should issue one req per plane, overlapping them all.
// in order to simplify the overlapping strategy, let's issue
// requests of the same type together.
read_reqs = (ssd_req **) malloc(max_reqs * sizeof(ssd_req *));
write_reqs = (ssd_req **) malloc(max_reqs * sizeof(ssd_req *));
// collect the requests
while ((req = ioqueue_get_next_request(elem->queue)) != NULL) {
int found = 0;
elem->metadata.reqs_waiting --;
// see if we already have the same request in the list.
// this usually doesn't happen -- but on synthetic traces
// this weird case can occur.
if (req->flags & READ) {
found = ssd_already_present(read_reqs, read_total, req);
} else {
found = ssd_already_present(write_reqs, write_total, req);
}
if (!found) {
// this is a valid request
ssd_req *r = malloc(sizeof(ssd_req));
r->blk = req->blkno;
r->count = req->bcount;
r->is_read = req->flags & READ;
r->org_req = req;
r->plane_num = -1; // we don't know to which plane this req will be directed at
if (req->flags & READ) {
read_reqs[read_total] = r;
read_total ++;
} else {
write_reqs[write_total] = r;
write_total ++;
}
// if we have more reqs than we can handle, quit
if ((read_total >= max_reqs) ||
(write_total >= max_reqs)) {
break;
}
} else {
// throw this request -- it doesn't make sense
stat_update (&currdisk->stat.acctimestats, 0);
req->time = simtime;
req->ssd_elem_num = elem_num;
req->type = DEVICE_ACCESS_COMPLETE;
addtointq ((event *)req);
}
}
if (read_total > 0) {
// first issue all the read requests (it doesn't matter what we
// issue first). i chose read because reads are mostly synchronous.
// find the time taken to serve these requests.
ssd_compute_access_time(currdisk, elem_num, read_reqs, read_total);
// add an event for each request completion
for (i = 0; i < read_total; i ++) {
elem->media_busy = TRUE;
// find the maximum time taken by a request
if (schtime < read_reqs[i]->schtime) {
schtime = read_reqs[i]->schtime;
}
stat_update (&currdisk->stat.acctimestats, read_reqs[i]->acctime);
read_reqs[i]->org_req->time = simtime + read_reqs[i]->schtime;
read_reqs[i]->org_req->ssd_elem_num = elem_num;
read_reqs[i]->org_req->type = DEVICE_ACCESS_COMPLETE;
//printf("R: blk %d elem %d acctime %f simtime %f\n", read_reqs[i]->blk,
// elem_num, read_reqs[i]->acctime, read_reqs[i]->org_req->time);
addtointq ((event *)read_reqs[i]->org_req);
free(read_reqs[i]);
}
}
free(read_reqs);
max_time_taken = schtime;
if (write_total > 0) {
// next issue the write requests
ssd_compute_access_time(currdisk, elem_num, write_reqs, write_total);
// add an event for each request completion.
// note that we can issue the writes only after all the reads above are
// over. so, include the maximum read time when creating the event.
for (i = 0; i < write_total; i ++) {
elem->media_busy = TRUE;
stat_update (&currdisk->stat.acctimestats, write_reqs[i]->acctime);
write_reqs[i]->org_req->time = simtime + schtime + write_reqs[i]->schtime;
//printf("blk %d elem %d acc time %f\n", write_reqs[i]->blk, elem_num, write_reqs[i]->acctime);
if (max_time_taken < (schtime+write_reqs[i]->schtime)) {
max_time_taken = (schtime+write_reqs[i]->schtime);
}
write_reqs[i]->org_req->ssd_elem_num = elem_num;
write_reqs[i]->org_req->type = DEVICE_ACCESS_COMPLETE;
//printf("W: blk %d elem %d acctime %f simtime %f\n", write_reqs[i]->blk,
// elem_num, write_reqs[i]->acctime, write_reqs[i]->org_req->time);
addtointq ((event *)write_reqs[i]->org_req);
free(write_reqs[i]);
}
}
free(write_reqs);
// statistics
tot_reqs_issued = read_total + write_total;
ASSERT(tot_reqs_issued > 0);
currdisk->elements[elem_num].stat.tot_reqs_issued += tot_reqs_issued;
currdisk->elements[elem_num].stat.tot_time_taken += max_time_taken;
}
}
