078f914e69
handle them like we do in FS mode, by blocking the TLB until the fault is handled by the fault->invoke()
529 lines
13 KiB
C++
529 lines
13 KiB
C++
/*
|
|
* Copyright (c) 2007 MIPS Technologies, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are
|
|
* met: redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer;
|
|
* redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution;
|
|
* neither the name of the copyright holders nor the names of its
|
|
* contributors may be used to endorse or promote products derived from
|
|
* this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* Authors: Korey Sewell
|
|
*
|
|
*/
|
|
|
|
#include <list>
|
|
#include <vector>
|
|
|
|
#include "base/str.hh"
|
|
#include "cpu/inorder/cpu.hh"
|
|
#include "cpu/inorder/resource.hh"
|
|
#include "cpu/inorder/resource_pool.hh"
|
|
#include "debug/ExecFaulting.hh"
|
|
#include "debug/RefCount.hh"
|
|
#include "debug/ResReqCount.hh"
|
|
#include "debug/Resource.hh"
|
|
|
|
using namespace std;
|
|
|
|
Resource::Resource(string res_name, int res_id, int res_width,
|
|
int res_latency, InOrderCPU *_cpu)
|
|
: resName(res_name), id(res_id),
|
|
width(res_width), latency(res_latency), cpu(_cpu),
|
|
resourceEvent(NULL)
|
|
{
|
|
reqs.resize(width);
|
|
|
|
// Use to deny a instruction a resource.
|
|
deniedReq = new ResourceRequest(this);
|
|
deniedReq->valid = true;
|
|
}
|
|
|
|
Resource::~Resource()
|
|
{
|
|
if (resourceEvent) {
|
|
delete [] resourceEvent;
|
|
}
|
|
|
|
delete deniedReq;
|
|
|
|
for (int i = 0; i < width; i++) {
|
|
delete reqs[i];
|
|
}
|
|
}
|
|
|
|
|
|
void
|
|
Resource::init()
|
|
{
|
|
// If the resource has a zero-cycle (no latency)
|
|
// function, then no reason to have events
|
|
// that will process them for the right tick
|
|
if (latency > 0)
|
|
resourceEvent = new ResourceEvent[width];
|
|
|
|
|
|
for (int i = 0; i < width; i++)
|
|
reqs[i] = new ResourceRequest(this);
|
|
|
|
|
|
initSlots();
|
|
}
|
|
|
|
void
|
|
Resource::initSlots()
|
|
{
|
|
// Add available slot numbers for resource
|
|
for (int slot_idx = 0; slot_idx < width; slot_idx++) {
|
|
availSlots.push_back(slot_idx);
|
|
|
|
if (resourceEvent) {
|
|
resourceEvent[slot_idx].init(this, slot_idx);
|
|
}
|
|
}
|
|
}
|
|
|
|
std::string
|
|
Resource::name()
|
|
{
|
|
return cpu->name() + "." + resName;
|
|
}
|
|
|
|
int
|
|
Resource::slotsAvail()
|
|
{
|
|
return availSlots.size();
|
|
}
|
|
|
|
int
|
|
Resource::slotsInUse()
|
|
{
|
|
return width - availSlots.size();
|
|
}
|
|
|
|
void
|
|
Resource::freeSlot(int slot_idx)
|
|
{
|
|
DPRINTF(Resource, "Deallocating [slot:%i].\n",
|
|
slot_idx);
|
|
|
|
// Put slot number on this resource's free list
|
|
availSlots.push_back(slot_idx);
|
|
|
|
// Invalidate Request & Reset it's flags
|
|
reqs[slot_idx]->clearRequest();
|
|
}
|
|
|
|
int
|
|
Resource::findSlot(DynInstPtr inst)
|
|
{
|
|
int slot_num = -1;
|
|
|
|
for (int i = 0; i < width; i++) {
|
|
if (reqs[i]->valid &&
|
|
reqs[i]->getInst()->seqNum == inst->seqNum) {
|
|
slot_num = reqs[i]->getSlot();
|
|
}
|
|
}
|
|
return slot_num;
|
|
}
|
|
|
|
int
|
|
Resource::getSlot(DynInstPtr inst)
|
|
{
|
|
int slot_num = -1;
|
|
|
|
if (slotsAvail() != 0) {
|
|
slot_num = availSlots[0];
|
|
|
|
vector<int>::iterator vect_it = availSlots.begin();
|
|
|
|
assert(slot_num == *vect_it);
|
|
|
|
availSlots.erase(vect_it);
|
|
}
|
|
|
|
return slot_num;
|
|
}
|
|
|
|
ResReqPtr
|
|
Resource::request(DynInstPtr inst)
|
|
{
|
|
// See if the resource is already serving this instruction.
|
|
// If so, use that request;
|
|
bool try_request = false;
|
|
int slot_num = -1;
|
|
int stage_num;
|
|
ResReqPtr inst_req = findRequest(inst);
|
|
|
|
if (inst_req) {
|
|
// If some preprocessing has to be done on instruction
|
|
// that has already requested once, then handle it here.
|
|
// update the 'try_request' variable if we should
|
|
// re-execute the request.
|
|
requestAgain(inst, try_request);
|
|
|
|
slot_num = inst_req->getSlot();
|
|
stage_num = inst_req->getStageNum();
|
|
} else {
|
|
// Get new slot # for instruction
|
|
slot_num = getSlot(inst);
|
|
|
|
if (slot_num != -1) {
|
|
DPRINTF(Resource, "Allocating [slot:%i] for [tid:%i]: [sn:%i]\n",
|
|
slot_num, inst->readTid(), inst->seqNum);
|
|
|
|
// Get Stage # from Schedule Entry
|
|
stage_num = inst->curSkedEntry->stageNum;
|
|
unsigned cmd = inst->curSkedEntry->cmd;
|
|
|
|
// Generate Resource Request
|
|
inst_req = getRequest(inst, stage_num, id, slot_num, cmd);
|
|
|
|
if (inst->staticInst) {
|
|
DPRINTF(Resource, "[tid:%i]: [sn:%i] requesting this "
|
|
"resource.\n",
|
|
inst->readTid(), inst->seqNum);
|
|
} else {
|
|
DPRINTF(Resource, "[tid:%i]: instruction requesting this "
|
|
"resource.\n",
|
|
inst->readTid());
|
|
}
|
|
|
|
try_request = true;
|
|
} else {
|
|
DPRINTF(Resource, "No slot available for [tid:%i]: [sn:%i]\n",
|
|
inst->readTid(), inst->seqNum);
|
|
}
|
|
|
|
}
|
|
|
|
if (try_request) {
|
|
// Schedule execution of resource
|
|
scheduleExecution(slot_num);
|
|
} else {
|
|
inst_req = deniedReq;
|
|
rejectRequest(inst);
|
|
}
|
|
|
|
return inst_req;
|
|
}
|
|
|
|
void
|
|
Resource::requestAgain(DynInstPtr inst, bool &do_request)
|
|
{
|
|
do_request = true;
|
|
|
|
if (inst->staticInst) {
|
|
DPRINTF(Resource, "[tid:%i]: [sn:%i] requesting this resource "
|
|
"again.\n",
|
|
inst->readTid(), inst->seqNum);
|
|
} else {
|
|
DPRINTF(Resource, "[tid:%i]: requesting this resource again.\n",
|
|
inst->readTid());
|
|
}
|
|
}
|
|
|
|
ResReqPtr
|
|
Resource::getRequest(DynInstPtr inst, int stage_num, int res_idx,
|
|
int slot_num, unsigned cmd)
|
|
{
|
|
reqs[slot_num]->setRequest(inst, stage_num, id, slot_num, cmd);
|
|
return reqs[slot_num];
|
|
}
|
|
|
|
ResReqPtr
|
|
Resource::findRequest(DynInstPtr inst)
|
|
{
|
|
for (int i = 0; i < width; i++) {
|
|
if (reqs[i]->valid &&
|
|
reqs[i]->getInst() == inst) {
|
|
return reqs[i];
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
void
|
|
Resource::rejectRequest(DynInstPtr inst)
|
|
{
|
|
DPRINTF(RefCount, "[tid:%i]: Unable to grant request for [sn:%i].\n",
|
|
inst->readTid(), inst->seqNum);
|
|
}
|
|
|
|
void
|
|
Resource::execute(int slot_idx)
|
|
{
|
|
//@todo: have each resource print out command their executing
|
|
DPRINTF(Resource, "[tid:%i]: Executing %s resource.\n",
|
|
reqs[slot_idx]->getTid(), name());
|
|
reqs[slot_idx]->setCompleted(true);
|
|
reqs[slot_idx]->done();
|
|
}
|
|
|
|
void
|
|
Resource::deactivateThread(ThreadID tid)
|
|
{
|
|
// In the most basic case, deactivation means squashing everything
|
|
// from a particular thread
|
|
DynInstPtr dummy_inst = new InOrderDynInst(cpu, NULL, 0, tid, tid);
|
|
squash(dummy_inst, 0, 0, tid);
|
|
}
|
|
|
|
void
|
|
Resource::setupSquash(DynInstPtr inst, int stage_num, ThreadID tid)
|
|
{
|
|
// Squash In Pipeline Stage
|
|
cpu->pipelineStage[stage_num]->setupSquash(inst, tid);
|
|
|
|
// Schedule Squash Through-out Resource Pool
|
|
cpu->resPool->scheduleEvent(
|
|
(InOrderCPU::CPUEventType)ResourcePool::SquashAll, inst, 0);
|
|
}
|
|
|
|
void
|
|
Resource::squash(DynInstPtr inst, int stage_num, InstSeqNum squash_seq_num,
|
|
ThreadID tid)
|
|
{
|
|
//@todo: check squash seq num before squashing. can save time going
|
|
// through this function.
|
|
for (int i = 0; i < width; i++) {
|
|
ResReqPtr req_ptr = reqs[i];
|
|
DynInstPtr inst = req_ptr->getInst();
|
|
|
|
if (req_ptr->valid &&
|
|
inst->readTid() == tid &&
|
|
inst->seqNum > squash_seq_num) {
|
|
|
|
DPRINTF(Resource, "[tid:%i]: Squashing [sn:%i].\n",
|
|
req_ptr->getInst()->readTid(),
|
|
req_ptr->getInst()->seqNum);
|
|
|
|
req_ptr->setSquashed();
|
|
|
|
int req_slot_num = req_ptr->getSlot();
|
|
|
|
if (latency > 0) {
|
|
if (resourceEvent[req_slot_num].scheduled())
|
|
unscheduleEvent(req_slot_num);
|
|
}
|
|
|
|
freeSlot(req_slot_num);
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
Resource::squashDueToMemStall(DynInstPtr inst, int stage_num,
|
|
InstSeqNum squash_seq_num,
|
|
ThreadID tid)
|
|
{
|
|
squash(inst, stage_num, squash_seq_num, tid);
|
|
}
|
|
|
|
void
|
|
Resource::squashThenTrap(int stage_num, DynInstPtr inst)
|
|
{
|
|
ThreadID tid = inst->readTid();
|
|
|
|
inst->setSquashInfo(stage_num);
|
|
setupSquash(inst, stage_num, tid);
|
|
|
|
if (inst->traceData) {
|
|
if (inst->staticInst &&
|
|
inst->fault != NoFault && DTRACE(ExecFaulting)) {
|
|
inst->traceData->setStageCycle(stage_num, curTick());
|
|
inst->traceData->setFetchSeq(inst->seqNum);
|
|
inst->traceData->dump();
|
|
}
|
|
|
|
delete inst->traceData;
|
|
inst->traceData = NULL;
|
|
}
|
|
|
|
cpu->trapContext(inst->fault, tid, inst);
|
|
}
|
|
|
|
Tick
|
|
Resource::ticks(int num_cycles)
|
|
{
|
|
return cpu->ticks(num_cycles);
|
|
}
|
|
|
|
|
|
void
|
|
Resource::scheduleExecution(int slot_num)
|
|
{
|
|
if (latency >= 1) {
|
|
scheduleEvent(slot_num, latency);
|
|
} else {
|
|
execute(slot_num);
|
|
}
|
|
}
|
|
|
|
void
|
|
Resource::scheduleEvent(int slot_idx, int delay)
|
|
{
|
|
DPRINTF(Resource, "[tid:%i]: Scheduling event for [sn:%i] on tick %i.\n",
|
|
reqs[slot_idx]->inst->readTid(),
|
|
reqs[slot_idx]->inst->seqNum,
|
|
cpu->ticks(delay) + curTick());
|
|
resourceEvent[slot_idx].scheduleEvent(delay);
|
|
}
|
|
|
|
bool
|
|
Resource::scheduleEvent(DynInstPtr inst, int delay)
|
|
{
|
|
int slot_idx = findSlot(inst);
|
|
|
|
if(slot_idx != -1)
|
|
resourceEvent[slot_idx].scheduleEvent(delay);
|
|
|
|
return slot_idx;
|
|
}
|
|
|
|
void
|
|
Resource::unscheduleEvent(int slot_idx)
|
|
{
|
|
resourceEvent[slot_idx].unscheduleEvent();
|
|
}
|
|
|
|
bool
|
|
Resource::unscheduleEvent(DynInstPtr inst)
|
|
{
|
|
int slot_idx = findSlot(inst);
|
|
|
|
if(slot_idx != -1)
|
|
resourceEvent[slot_idx].unscheduleEvent();
|
|
|
|
return slot_idx;
|
|
}
|
|
|
|
int ResourceRequest::resReqID = 0;
|
|
|
|
int ResourceRequest::maxReqCount = 0;
|
|
|
|
ResourceRequest::ResourceRequest(Resource *_res)
|
|
: res(_res), inst(NULL), stagePasses(0), valid(false), doneInResource(false),
|
|
completed(false), squashed(false), processing(false),
|
|
memStall(false)
|
|
{
|
|
}
|
|
|
|
ResourceRequest::~ResourceRequest()
|
|
{
|
|
#ifdef DEBUG
|
|
res->cpu->resReqCount--;
|
|
DPRINTF(ResReqCount, "Res. Req %i deleted. resReqCount=%i.\n", reqID,
|
|
res->cpu->resReqCount);
|
|
#endif
|
|
inst = NULL;
|
|
}
|
|
|
|
std::string
|
|
ResourceRequest::name()
|
|
{
|
|
return csprintf("%s[slot:%i]:", res->name(), slotNum);
|
|
}
|
|
|
|
void
|
|
ResourceRequest::setRequest(DynInstPtr _inst, int stage_num,
|
|
int res_idx, int slot_num, unsigned _cmd)
|
|
{
|
|
valid = true;
|
|
inst = _inst;
|
|
stageNum = stage_num;
|
|
resIdx = res_idx;
|
|
slotNum = slot_num;
|
|
cmd = _cmd;
|
|
}
|
|
|
|
void
|
|
ResourceRequest::clearRequest()
|
|
{
|
|
valid = false;
|
|
inst = NULL;
|
|
stagePasses = 0;
|
|
completed = false;
|
|
doneInResource = false;
|
|
squashed = false;
|
|
memStall = false;
|
|
}
|
|
|
|
void
|
|
ResourceRequest::freeSlot()
|
|
{
|
|
assert(res);
|
|
|
|
// Free Slot So Another Instruction Can Use This Resource
|
|
res->freeSlot(slotNum);
|
|
}
|
|
|
|
void
|
|
ResourceRequest::done(bool completed)
|
|
{
|
|
DPRINTF(Resource, "done with request from "
|
|
"[sn:%i] [tid:%i].\n",
|
|
inst->seqNum, inst->readTid());
|
|
|
|
setCompleted(completed);
|
|
|
|
doneInResource = true;
|
|
}
|
|
|
|
ResourceEvent::ResourceEvent()
|
|
: Event((Event::Priority)Resource_Event_Pri)
|
|
{ }
|
|
|
|
ResourceEvent::ResourceEvent(Resource *res, int slot_idx)
|
|
: Event((Event::Priority)Resource_Event_Pri), resource(res),
|
|
slotIdx(slot_idx)
|
|
{ }
|
|
|
|
void
|
|
ResourceEvent::init(Resource *res, int slot_idx)
|
|
{
|
|
resource = res;
|
|
slotIdx = slot_idx;
|
|
}
|
|
|
|
void
|
|
ResourceEvent::process()
|
|
{
|
|
resource->execute(slotIdx);
|
|
}
|
|
|
|
const char *
|
|
ResourceEvent::description()
|
|
{
|
|
string desc = resource->name() + "-event:slot[" + to_string(slotIdx)
|
|
+ "]";
|
|
|
|
return desc.c_str();
|
|
}
|
|
|
|
void
|
|
ResourceEvent::scheduleEvent(int delay)
|
|
{
|
|
assert(!scheduled() || squashed());
|
|
resource->cpu->reschedule(this,
|
|
curTick() + resource->ticks(delay), true);
|
|
}
|