src/gpu-compute/shader.cc - arm/gem5 - Git at Google

 /*
  * Copyright (c) 2011-2015 Advanced Micro Devices, Inc.
  * All rights reserved.
  *
  * For use for simulation and test purposes only
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  * 1. Redistributions of source code must retain the above copyright notice,
  * this list of conditions and the following disclaimer.
  *
  * 2. 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.
  *
  * 3. Neither the name of the copyright holder 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 HOLDER 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.
  *
  * Author: Steve Reinhardt
  */

 #include "gpu-compute/shader.hh"

 #include <limits>

 #include "arch/x86/linux/linux.hh"
 #include "base/chunk_generator.hh"
 #include "debug/GPUDisp.hh"
 #include "debug/GPUMem.hh"
 #include "debug/HSAIL.hh"
 #include "gpu-compute/dispatcher.hh"
 #include "gpu-compute/gpu_static_inst.hh"
 #include "gpu-compute/qstruct.hh"
 #include "gpu-compute/wavefront.hh"
 #include "mem/packet.hh"
 #include "mem/ruby/system/RubySystem.hh"
 #include "sim/sim_exit.hh"

 Shader::Shader(const Params *p)
     : ClockedObject(p), clock(p->clk_domain->clockPeriod()),
       cpuThread(nullptr), gpuTc(nullptr), cpuPointer(p->cpu_pointer),
       tickEvent([this]{ processTick(); }, "Shader tick",
                 false, Event::CPU_Tick_Pri),
       timingSim(p->timing), hsail_mode(SIMT),
       impl_kern_boundary_sync(p->impl_kern_boundary_sync),
       separate_acquire_release(p->separate_acquire_release), coissue_return(1),
       trace_vgpr_all(1), n_cu((p->CUs).size()), n_wf(p->n_wf),
       globalMemSize(p->globalmem), nextSchedCu(0), sa_n(0), tick_cnt(0),
       box_tick_cnt(0), start_tick_cnt(0)
 {

     cuList.resize(n_cu);

     for (int i = 0; i < n_cu; ++i) {
         cuList[i] = p->CUs[i];
         assert(i == cuList[i]->cu_id);
         cuList[i]->shader = this;
     }
 }

 Addr
 Shader::mmap(int length)
 {

     Addr start;

     // round up length to the next page
     length = roundUp(length, TheISA::PageBytes);

     Process *proc = gpuTc->getProcessPtr();
     auto mem_state = proc->memState;

     if (proc->mmapGrowsDown()) {
         DPRINTF(HSAIL, "GROWS DOWN");
         start = mem_state->getMmapEnd() - length;
         mem_state->setMmapEnd(start);
     } else {
         DPRINTF(HSAIL, "GROWS UP");
         start = mem_state->getMmapEnd();
         mem_state->setMmapEnd(start + length);

         // assertion to make sure we don't overwrite the stack (it grows down)
         assert(mem_state->getStackBase() - mem_state->getMaxStackSize() >
                mem_state->getMmapEnd());
     }

     DPRINTF(HSAIL,"Shader::mmap start= %#x, %#x\n", start, length);

     proc->allocateMem(start, length);

     return start;
 }

 void
 Shader::init()
 {
     // grab the threadContext of the thread running on the CPU
     assert(cpuPointer);
     gpuTc = cpuPointer->getContext(0);
     assert(gpuTc);
 }

 Shader::~Shader()
 {
     for (int j = 0; j < n_cu; ++j)
         delete cuList[j];
 }

 void
 Shader::updateContext(int cid) {
     // context of the thread which dispatched work
     assert(cpuPointer);
     gpuTc = cpuPointer->getContext(cid);
     assert(gpuTc);
 }

 void
 Shader::hostWakeUp(BaseCPU *cpu) {
     if (cpuPointer == cpu) {
         if (gpuTc->status() == ThreadContext::Suspended)
             cpu->activateContext(gpuTc->threadId());
     } else {
         //Make sure both dispatcher and shader are trying to
         //wakeup same host. Hack here to enable kernel launch
         //from multiple CPUs
         panic("Dispatcher wants to wakeup a different host");
     }
 }

 Shader*
 ShaderParams::create()
 {
     return new Shader(this);
 }

 void
 Shader::exec()
 {
     tick_cnt = curTick();
     box_tick_cnt = curTick() - start_tick_cnt;

     // apply any scheduled adds
     for (int i = 0; i < sa_n; ++i) {
         if (sa_when[i] <= tick_cnt) {
             *sa_val[i] += sa_x[i];
             sa_val.erase(sa_val.begin() + i);
             sa_x.erase(sa_x.begin() + i);
             sa_when.erase(sa_when.begin() + i);
             --sa_n;
             --i;
         }
     }

     // clock all of the cu's
     for (int i = 0; i < n_cu; ++i)
         cuList[i]->exec();
 }

 bool
 Shader::dispatch_workgroups(NDRange *ndr)
 {
     bool scheduledSomething = false;
     int cuCount = 0;
     int curCu = nextSchedCu;

     while (cuCount < n_cu) {
         //Every time we try a CU, update nextSchedCu
         nextSchedCu = (nextSchedCu + 1) % n_cu;

         // dispatch workgroup iff the following two conditions are met:
         // (a) wg_rem is true - there are unassigned workgroups in the grid
         // (b) there are enough free slots in cu cuList[i] for this wg
         if (ndr->wg_disp_rem && cuList[curCu]->ReadyWorkgroup(ndr)) {
             scheduledSomething = true;
             DPRINTF(GPUDisp, "Dispatching a workgroup to CU %d\n", curCu);

             // ticks() member function translates cycles to simulation ticks.
             if (!tickEvent.scheduled()) {
                 schedule(tickEvent, curTick() + this->ticks(1));
             }

             cuList[curCu]->StartWorkgroup(ndr);
             ndr->wgId[0]++;
             ndr->globalWgId++;
             if (ndr->wgId[0] * ndr->q.wgSize[0] >= ndr->q.gdSize[0]) {
                 ndr->wgId[0] = 0;
                 ndr->wgId[1]++;

                 if (ndr->wgId[1] * ndr->q.wgSize[1] >= ndr->q.gdSize[1]) {
                     ndr->wgId[1] = 0;
                     ndr->wgId[2]++;

                     if (ndr->wgId[2] * ndr->q.wgSize[2] >= ndr->q.gdSize[2]) {
                         ndr->wg_disp_rem = false;
                         break;
                     }
                 }
             }
         }

         ++cuCount;
         curCu = nextSchedCu;
     }

     return scheduledSomething;
 }

 void
 Shader::handshake(GpuDispatcher *_dispatcher)
 {
     dispatcher = _dispatcher;
 }

 void
 Shader::doFunctionalAccess(RequestPtr req, MemCmd cmd, void *data,
                            bool suppress_func_errors, int cu_id)
 {
     int block_size = cuList.at(cu_id)->cacheLineSize();
     unsigned size = req->getSize();

     Addr tmp_addr;
     BaseTLB::Mode trans_mode;

     if (cmd == MemCmd::ReadReq) {
         trans_mode = BaseTLB::Read;
     } else if (cmd == MemCmd::WriteReq) {
         trans_mode = BaseTLB::Write;
     } else {
         fatal("unexcepted MemCmd\n");
     }

     tmp_addr = req->getVaddr();
     Addr split_addr = roundDown(tmp_addr + size - 1, block_size);

     assert(split_addr <= tmp_addr || split_addr - tmp_addr < block_size);

     // Misaligned access
     if (split_addr > tmp_addr) {
         RequestPtr req1, req2;
         req->splitOnVaddr(split_addr, req1, req2);


         PacketPtr pkt1 = new Packet(req2, cmd);
         PacketPtr pkt2 = new Packet(req1, cmd);

         functionalTLBAccess(pkt1, cu_id, trans_mode);
         functionalTLBAccess(pkt2, cu_id, trans_mode);

         PacketPtr new_pkt1 = new Packet(pkt1->req, cmd);
         PacketPtr new_pkt2 = new Packet(pkt2->req, cmd);

         new_pkt1->dataStatic(data);
         new_pkt2->dataStatic((uint8_t*)data + req1->getSize());

         if (suppress_func_errors) {
             new_pkt1->setSuppressFuncError();
             new_pkt2->setSuppressFuncError();
         }

         // fixme: this should be cuList[cu_id] if cu_id != n_cu
         // The latter requires a memPort in the dispatcher
         cuList[0]->memPort[0]->sendFunctional(new_pkt1);
         cuList[0]->memPort[0]->sendFunctional(new_pkt2);

         delete new_pkt1;
         delete new_pkt2;
         delete pkt1;
         delete pkt2;
     } else {
         PacketPtr pkt = new Packet(req, cmd);
         functionalTLBAccess(pkt, cu_id, trans_mode);
         PacketPtr new_pkt = new Packet(pkt->req, cmd);
         new_pkt->dataStatic(data);

         if (suppress_func_errors) {
             new_pkt->setSuppressFuncError();
         };

         // fixme: this should be cuList[cu_id] if cu_id != n_cu
         // The latter requires a memPort in the dispatcher
         cuList[0]->memPort[0]->sendFunctional(new_pkt);

         delete new_pkt;
         delete pkt;
     }
 }

 bool
 Shader::busy()
 {
     for (int i_cu = 0; i_cu < n_cu; ++i_cu) {
         if (!cuList[i_cu]->isDone()) {
             return true;
         }
     }

     return false;
 }

 void
 Shader::ScheduleAdd(uint32_t *val,Tick when,int x)
 {
     sa_val.push_back(val);
     sa_when.push_back(tick_cnt + when);
     sa_x.push_back(x);
     ++sa_n;
 }


 void
 Shader::processTick()
 {
     if (busy()) {
         exec();
         schedule(tickEvent, curTick() + ticks(1));
     }
 }

 void
 Shader::AccessMem(uint64_t address, void *ptr, uint32_t size, int cu_id,
                   MemCmd cmd, bool suppress_func_errors)
 {
     uint8_t *data_buf = (uint8_t*)ptr;

     for (ChunkGenerator gen(address, size, cuList.at(cu_id)->cacheLineSize());
          !gen.done(); gen.next()) {
         Request *req = new Request(0, gen.addr(), gen.size(), 0,
                                    cuList[0]->masterId(), 0, 0, 0);

         doFunctionalAccess(req, cmd, data_buf, suppress_func_errors, cu_id);
         data_buf += gen.size();
         delete req;
     }
 }

 void
 Shader::ReadMem(uint64_t address, void *ptr, uint32_t size, int cu_id)
 {
     AccessMem(address, ptr, size, cu_id, MemCmd::ReadReq, false);
 }

 void
 Shader::ReadMem(uint64_t address, void *ptr, uint32_t size, int cu_id,
                 bool suppress_func_errors)
 {
     AccessMem(address, ptr, size, cu_id, MemCmd::ReadReq, suppress_func_errors);
 }

 void
 Shader::WriteMem(uint64_t address, void *ptr,uint32_t size, int cu_id)
 {
     AccessMem(address, ptr, size, cu_id, MemCmd::WriteReq, false);
 }

 void
 Shader::WriteMem(uint64_t address, void *ptr, uint32_t size, int cu_id,
                  bool suppress_func_errors)
 {
     AccessMem(address, ptr, size, cu_id, MemCmd::WriteReq,
               suppress_func_errors);
 }

 /*
  * Send a packet through the appropriate TLB functional port.
  * If cu_id=n_cu, then this is the dispatcher's TLB.
  * Otherwise it's the TLB of the cu_id compute unit.
  */
 void
 Shader::functionalTLBAccess(PacketPtr pkt, int cu_id, BaseTLB::Mode mode)
 {
     // update senderState. Need to know the gpuTc and the TLB mode
     pkt->senderState =
         new TheISA::GpuTLB::TranslationState(mode, gpuTc, false);

     if (cu_id == n_cu) {
         dispatcher->tlbPort->sendFunctional(pkt);
     } else {
         // even when the perLaneTLB flag is turned on
         // it's ok tp send all accesses through lane 0
         // since the lane # is not known here,
         // This isn't important since these are functional accesses.
         cuList[cu_id]->tlbPort[0]->sendFunctional(pkt);
     }

     /* safe_cast the senderState */
     TheISA::GpuTLB::TranslationState *sender_state =
                safe_cast<TheISA::GpuTLB::TranslationState*>(pkt->senderState);

     delete sender_state->tlbEntry;
     delete pkt->senderState;
 }
	/*
	* Copyright (c) 2011-2015 Advanced Micro Devices, Inc.
	* All rights reserved.
	*
	* For use for simulation and test purposes only
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions are met:
	*
	* 1. Redistributions of source code must retain the above copyright notice,
	* this list of conditions and the following disclaimer.
	*
	* 2. 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.
	*
	* 3. Neither the name of the copyright holder 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 HOLDER 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.
	*
	* Author: Steve Reinhardt
	*/

	#include "gpu-compute/shader.hh"

	#include <limits>

	#include "arch/x86/linux/linux.hh"
	#include "base/chunk_generator.hh"
	#include "debug/GPUDisp.hh"
	#include "debug/GPUMem.hh"
	#include "debug/HSAIL.hh"
	#include "gpu-compute/dispatcher.hh"
	#include "gpu-compute/gpu_static_inst.hh"
	#include "gpu-compute/qstruct.hh"
	#include "gpu-compute/wavefront.hh"
	#include "mem/packet.hh"
	#include "mem/ruby/system/RubySystem.hh"
	#include "sim/sim_exit.hh"

	Shader::Shader(const Params *p)
	: ClockedObject(p), clock(p->clk_domain->clockPeriod()),
	cpuThread(nullptr), gpuTc(nullptr), cpuPointer(p->cpu_pointer),
	tickEvent([this]{ processTick(); }, "Shader tick",
	false, Event::CPU_Tick_Pri),
	timingSim(p->timing), hsail_mode(SIMT),
	impl_kern_boundary_sync(p->impl_kern_boundary_sync),
	separate_acquire_release(p->separate_acquire_release), coissue_return(1),
	trace_vgpr_all(1), n_cu((p->CUs).size()), n_wf(p->n_wf),
	globalMemSize(p->globalmem), nextSchedCu(0), sa_n(0), tick_cnt(0),
	box_tick_cnt(0), start_tick_cnt(0)
	{

	cuList.resize(n_cu);

	for (int i = 0; i < n_cu; ++i) {
	cuList[i] = p->CUs[i];
	assert(i == cuList[i]->cu_id);
	cuList[i]->shader = this;
	}
	}

	Addr
	Shader::mmap(int length)
	{

	Addr start;

	// round up length to the next page
	length = roundUp(length, TheISA::PageBytes);

	Process *proc = gpuTc->getProcessPtr();
	auto mem_state = proc->memState;

	if (proc->mmapGrowsDown()) {
	DPRINTF(HSAIL, "GROWS DOWN");
	start = mem_state->getMmapEnd() - length;
	mem_state->setMmapEnd(start);
	} else {
	DPRINTF(HSAIL, "GROWS UP");
	start = mem_state->getMmapEnd();
	mem_state->setMmapEnd(start + length);

	// assertion to make sure we don't overwrite the stack (it grows down)
	assert(mem_state->getStackBase() - mem_state->getMaxStackSize() >
	mem_state->getMmapEnd());
	}

	DPRINTF(HSAIL,"Shader::mmap start= %#x, %#x\n", start, length);

	proc->allocateMem(start, length);

	return start;
	}

	void
	Shader::init()
	{
	// grab the threadContext of the thread running on the CPU
	assert(cpuPointer);
	gpuTc = cpuPointer->getContext(0);
	assert(gpuTc);
	}

	Shader::~Shader()
	{
	for (int j = 0; j < n_cu; ++j)
	delete cuList[j];
	}

	void
	Shader::updateContext(int cid) {
	// context of the thread which dispatched work
	assert(cpuPointer);
	gpuTc = cpuPointer->getContext(cid);
	assert(gpuTc);
	}

	void
	Shader::hostWakeUp(BaseCPU *cpu) {
	if (cpuPointer == cpu) {
	if (gpuTc->status() == ThreadContext::Suspended)
	cpu->activateContext(gpuTc->threadId());
	} else {
	//Make sure both dispatcher and shader are trying to
	//wakeup same host. Hack here to enable kernel launch
	//from multiple CPUs
	panic("Dispatcher wants to wakeup a different host");
	}
	}

	Shader*
	ShaderParams::create()
	{
	return new Shader(this);
	}

	void
	Shader::exec()
	{
	tick_cnt = curTick();
	box_tick_cnt = curTick() - start_tick_cnt;

	// apply any scheduled adds
	for (int i = 0; i < sa_n; ++i) {
	if (sa_when[i] <= tick_cnt) {
	*sa_val[i] += sa_x[i];
	sa_val.erase(sa_val.begin() + i);
	sa_x.erase(sa_x.begin() + i);
	sa_when.erase(sa_when.begin() + i);
	--sa_n;
	--i;
	}
	}

	// clock all of the cu's
	for (int i = 0; i < n_cu; ++i)
	cuList[i]->exec();
	}

	bool
	Shader::dispatch_workgroups(NDRange *ndr)
	{
	bool scheduledSomething = false;
	int cuCount = 0;
	int curCu = nextSchedCu;

	while (cuCount < n_cu) {
	//Every time we try a CU, update nextSchedCu
	nextSchedCu = (nextSchedCu + 1) % n_cu;

	// dispatch workgroup iff the following two conditions are met:
	// (a) wg_rem is true - there are unassigned workgroups in the grid
	// (b) there are enough free slots in cu cuList[i] for this wg
	if (ndr->wg_disp_rem && cuList[curCu]->ReadyWorkgroup(ndr)) {
	scheduledSomething = true;
	DPRINTF(GPUDisp, "Dispatching a workgroup to CU %d\n", curCu);

	// ticks() member function translates cycles to simulation ticks.
	if (!tickEvent.scheduled()) {
	schedule(tickEvent, curTick() + this->ticks(1));
	}

	cuList[curCu]->StartWorkgroup(ndr);
	ndr->wgId[0]++;
	ndr->globalWgId++;
	if (ndr->wgId[0] * ndr->q.wgSize[0] >= ndr->q.gdSize[0]) {
	ndr->wgId[0] = 0;
	ndr->wgId[1]++;

	if (ndr->wgId[1] * ndr->q.wgSize[1] >= ndr->q.gdSize[1]) {
	ndr->wgId[1] = 0;
	ndr->wgId[2]++;

	if (ndr->wgId[2] * ndr->q.wgSize[2] >= ndr->q.gdSize[2]) {
	ndr->wg_disp_rem = false;
	break;
	}
	}
	}
	}

	++cuCount;
	curCu = nextSchedCu;
	}

	return scheduledSomething;
	}

	void
	Shader::handshake(GpuDispatcher *_dispatcher)
	{
	dispatcher = _dispatcher;
	}

	void
	Shader::doFunctionalAccess(RequestPtr req, MemCmd cmd, void *data,
	bool suppress_func_errors, int cu_id)
	{
	int block_size = cuList.at(cu_id)->cacheLineSize();
	unsigned size = req->getSize();

	Addr tmp_addr;
	BaseTLB::Mode trans_mode;

	if (cmd == MemCmd::ReadReq) {
	trans_mode = BaseTLB::Read;
	} else if (cmd == MemCmd::WriteReq) {
	trans_mode = BaseTLB::Write;
	} else {
	fatal("unexcepted MemCmd\n");
	}

	tmp_addr = req->getVaddr();
	Addr split_addr = roundDown(tmp_addr + size - 1, block_size);

	assert(split_addr <= tmp_addr \|\| split_addr - tmp_addr < block_size);

	// Misaligned access
	if (split_addr > tmp_addr) {
	RequestPtr req1, req2;
	req->splitOnVaddr(split_addr, req1, req2);


	PacketPtr pkt1 = new Packet(req2, cmd);
	PacketPtr pkt2 = new Packet(req1, cmd);

	functionalTLBAccess(pkt1, cu_id, trans_mode);
	functionalTLBAccess(pkt2, cu_id, trans_mode);

	PacketPtr new_pkt1 = new Packet(pkt1->req, cmd);
	PacketPtr new_pkt2 = new Packet(pkt2->req, cmd);

	new_pkt1->dataStatic(data);
	new_pkt2->dataStatic((uint8_t*)data + req1->getSize());

	if (suppress_func_errors) {
	new_pkt1->setSuppressFuncError();
	new_pkt2->setSuppressFuncError();
	}

	// fixme: this should be cuList[cu_id] if cu_id != n_cu
	// The latter requires a memPort in the dispatcher
	cuList[0]->memPort[0]->sendFunctional(new_pkt1);
	cuList[0]->memPort[0]->sendFunctional(new_pkt2);

	delete new_pkt1;
	delete new_pkt2;
	delete pkt1;
	delete pkt2;
	} else {
	PacketPtr pkt = new Packet(req, cmd);
	functionalTLBAccess(pkt, cu_id, trans_mode);
	PacketPtr new_pkt = new Packet(pkt->req, cmd);
	new_pkt->dataStatic(data);

	if (suppress_func_errors) {
	new_pkt->setSuppressFuncError();
	};

	// fixme: this should be cuList[cu_id] if cu_id != n_cu
	// The latter requires a memPort in the dispatcher
	cuList[0]->memPort[0]->sendFunctional(new_pkt);

	delete new_pkt;
	delete pkt;
	}
	}

	bool
	Shader::busy()
	{
	for (int i_cu = 0; i_cu < n_cu; ++i_cu) {
	if (!cuList[i_cu]->isDone()) {
	return true;
	}
	}

	return false;
	}

	void
	Shader::ScheduleAdd(uint32_t *val,Tick when,int x)
	{
	sa_val.push_back(val);
	sa_when.push_back(tick_cnt + when);
	sa_x.push_back(x);
	++sa_n;
	}


	void
	Shader::processTick()
	{
	if (busy()) {
	exec();
	schedule(tickEvent, curTick() + ticks(1));
	}
	}

	void
	Shader::AccessMem(uint64_t address, void *ptr, uint32_t size, int cu_id,
	MemCmd cmd, bool suppress_func_errors)
	{
	uint8_t data_buf = (uint8_t)ptr;

	for (ChunkGenerator gen(address, size, cuList.at(cu_id)->cacheLineSize());
	!gen.done(); gen.next()) {
	Request *req = new Request(0, gen.addr(), gen.size(), 0,
	cuList[0]->masterId(), 0, 0, 0);

	doFunctionalAccess(req, cmd, data_buf, suppress_func_errors, cu_id);
	data_buf += gen.size();
	delete req;
	}
	}

	void
	Shader::ReadMem(uint64_t address, void *ptr, uint32_t size, int cu_id)
	{
	AccessMem(address, ptr, size, cu_id, MemCmd::ReadReq, false);
	}

	void
	Shader::ReadMem(uint64_t address, void *ptr, uint32_t size, int cu_id,
	bool suppress_func_errors)
	{
	AccessMem(address, ptr, size, cu_id, MemCmd::ReadReq, suppress_func_errors);
	}

	void
	Shader::WriteMem(uint64_t address, void *ptr,uint32_t size, int cu_id)
	{
	AccessMem(address, ptr, size, cu_id, MemCmd::WriteReq, false);
	}

	void
	Shader::WriteMem(uint64_t address, void *ptr, uint32_t size, int cu_id,
	bool suppress_func_errors)
	{
	AccessMem(address, ptr, size, cu_id, MemCmd::WriteReq,
	suppress_func_errors);
	}

	/*
	* Send a packet through the appropriate TLB functional port.
	* If cu_id=n_cu, then this is the dispatcher's TLB.
	* Otherwise it's the TLB of the cu_id compute unit.
	*/
	void
	Shader::functionalTLBAccess(PacketPtr pkt, int cu_id, BaseTLB::Mode mode)
	{
	// update senderState. Need to know the gpuTc and the TLB mode
	pkt->senderState =
	new TheISA::GpuTLB::TranslationState(mode, gpuTc, false);

	if (cu_id == n_cu) {
	dispatcher->tlbPort->sendFunctional(pkt);
	} else {
	// even when the perLaneTLB flag is turned on
	// it's ok tp send all accesses through lane 0
	// since the lane # is not known here,
	// This isn't important since these are functional accesses.
	cuList[cu_id]->tlbPort[0]->sendFunctional(pkt);
	}

	/* safe_cast the senderState */
	TheISA::GpuTLB::TranslationState *sender_state =
	safe_cast<TheISA::GpuTLB::TranslationState*>(pkt->senderState);

	delete sender_state->tlbEntry;
	delete pkt->senderState;
	}