| /* |
| * Copyright (c) 2011-2017 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. |
| * |
| * Authors: Lisa Hsu |
| */ |
| |
| #include "gpu-compute/wavefront.hh" |
| |
| #include "debug/GPUExec.hh" |
| #include "debug/WavefrontStack.hh" |
| #include "gpu-compute/compute_unit.hh" |
| #include "gpu-compute/gpu_dyn_inst.hh" |
| #include "gpu-compute/shader.hh" |
| #include "gpu-compute/vector_register_file.hh" |
| |
| Wavefront* |
| WavefrontParams::create() |
| { |
| return new Wavefront(this); |
| } |
| |
| Wavefront::Wavefront(const Params *p) |
| : SimObject(p), callArgMem(nullptr), _gpuISA() |
| { |
| lastTrace = 0; |
| simdId = p->simdId; |
| wfSlotId = p->wf_slot_id; |
| status = S_STOPPED; |
| reservedVectorRegs = 0; |
| startVgprIndex = 0; |
| outstandingReqs = 0; |
| memReqsInPipe = 0; |
| outstandingReqsWrGm = 0; |
| outstandingReqsWrLm = 0; |
| outstandingReqsRdGm = 0; |
| outstandingReqsRdLm = 0; |
| rdLmReqsInPipe = 0; |
| rdGmReqsInPipe = 0; |
| wrLmReqsInPipe = 0; |
| wrGmReqsInPipe = 0; |
| |
| barrierCnt = 0; |
| oldBarrierCnt = 0; |
| stalledAtBarrier = false; |
| |
| memTraceBusy = 0; |
| oldVgprTcnt = 0xffffffffffffffffll; |
| oldDgprTcnt = 0xffffffffffffffffll; |
| oldVgpr.resize(p->wfSize); |
| |
| pendingFetch = false; |
| dropFetch = false; |
| condRegState = new ConditionRegisterState(); |
| maxSpVgprs = 0; |
| maxDpVgprs = 0; |
| lastAddr.resize(p->wfSize); |
| workItemFlatId.resize(p->wfSize); |
| oldDgpr.resize(p->wfSize); |
| barCnt.resize(p->wfSize); |
| for (int i = 0; i < 3; ++i) { |
| workItemId[i].resize(p->wfSize); |
| } |
| } |
| |
| void |
| Wavefront::regStats() |
| { |
| SimObject::regStats(); |
| |
| srcRegOpDist |
| .init(0, 4, 2) |
| .name(name() + ".src_reg_operand_dist") |
| .desc("number of executed instructions with N source register operands") |
| ; |
| |
| dstRegOpDist |
| .init(0, 3, 2) |
| .name(name() + ".dst_reg_operand_dist") |
| .desc("number of executed instructions with N destination register " |
| "operands") |
| ; |
| |
| // FIXME: the name of the WF needs to be unique |
| numTimesBlockedDueWAXDependencies |
| .name(name() + ".timesBlockedDueWAXDependencies") |
| .desc("number of times the wf's instructions are blocked due to WAW " |
| "or WAR dependencies") |
| ; |
| |
| // FIXME: the name of the WF needs to be unique |
| numTimesBlockedDueRAWDependencies |
| .name(name() + ".timesBlockedDueRAWDependencies") |
| .desc("number of times the wf's instructions are blocked due to RAW " |
| "dependencies") |
| ; |
| |
| // FIXME: the name of the WF needs to be unique |
| numTimesBlockedDueVrfPortAvail |
| .name(name() + ".timesBlockedDueVrfPortAvail") |
| .desc("number of times instructions are blocked due to VRF port " |
| "availability") |
| ; |
| } |
| |
| void |
| Wavefront::init() |
| { |
| reservedVectorRegs = 0; |
| startVgprIndex = 0; |
| } |
| |
| void |
| Wavefront::resizeRegFiles(int num_cregs, int num_sregs, int num_dregs) |
| { |
| condRegState->init(num_cregs); |
| maxSpVgprs = num_sregs; |
| maxDpVgprs = num_dregs; |
| } |
| |
| Wavefront::~Wavefront() |
| { |
| if (callArgMem) |
| delete callArgMem; |
| delete condRegState; |
| } |
| |
| void |
| Wavefront::start(uint64_t _wf_dyn_id,uint64_t _base_ptr) |
| { |
| wfDynId = _wf_dyn_id; |
| basePtr = _base_ptr; |
| status = S_RUNNING; |
| } |
| |
| bool |
| Wavefront::isGmInstruction(GPUDynInstPtr ii) |
| { |
| if (ii->isGlobalMem() || ii->isFlat()) |
| return true; |
| |
| return false; |
| } |
| |
| bool |
| Wavefront::isLmInstruction(GPUDynInstPtr ii) |
| { |
| if (ii->isLocalMem()) { |
| return true; |
| } |
| |
| return false; |
| } |
| |
| bool |
| Wavefront::isOldestInstALU() |
| { |
| assert(!instructionBuffer.empty()); |
| GPUDynInstPtr ii = instructionBuffer.front(); |
| |
| if (status != S_STOPPED && (ii->isNop() || |
| ii->isReturn() || ii->isBranch() || |
| ii->isALU() || (ii->isKernArgSeg() && ii->isLoad()))) { |
| return true; |
| } |
| |
| return false; |
| } |
| |
| bool |
| Wavefront::isOldestInstBarrier() |
| { |
| assert(!instructionBuffer.empty()); |
| GPUDynInstPtr ii = instructionBuffer.front(); |
| |
| if (status != S_STOPPED && ii->isBarrier()) { |
| return true; |
| } |
| |
| return false; |
| } |
| |
| bool |
| Wavefront::isOldestInstGMem() |
| { |
| assert(!instructionBuffer.empty()); |
| GPUDynInstPtr ii = instructionBuffer.front(); |
| |
| if (status != S_STOPPED && ii->isGlobalMem()) { |
| return true; |
| } |
| |
| return false; |
| } |
| |
| bool |
| Wavefront::isOldestInstLMem() |
| { |
| assert(!instructionBuffer.empty()); |
| GPUDynInstPtr ii = instructionBuffer.front(); |
| |
| if (status != S_STOPPED && ii->isLocalMem()) { |
| return true; |
| } |
| |
| return false; |
| } |
| |
| bool |
| Wavefront::isOldestInstPrivMem() |
| { |
| assert(!instructionBuffer.empty()); |
| GPUDynInstPtr ii = instructionBuffer.front(); |
| |
| if (status != S_STOPPED && ii->isPrivateSeg()) { |
| return true; |
| } |
| |
| return false; |
| } |
| |
| bool |
| Wavefront::isOldestInstFlatMem() |
| { |
| assert(!instructionBuffer.empty()); |
| GPUDynInstPtr ii = instructionBuffer.front(); |
| |
| if (status != S_STOPPED && ii->isFlat()) { |
| return true; |
| } |
| |
| return false; |
| } |
| |
| // Return true if the Wavefront's instruction |
| // buffer has branch instruction. |
| bool |
| Wavefront::instructionBufferHasBranch() |
| { |
| for (auto it : instructionBuffer) { |
| GPUDynInstPtr ii = it; |
| |
| if (ii->isReturn() || ii->isBranch()) { |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| // Remap HSAIL register to physical VGPR. |
| // HSAIL register = virtual register assigned to an operand by HLC compiler |
| uint32_t |
| Wavefront::remap(uint32_t vgprIndex, uint32_t size, uint8_t mode) |
| { |
| assert((vgprIndex < reservedVectorRegs) && (reservedVectorRegs > 0)); |
| // add the offset from where the VGPRs of the wavefront have been assigned |
| uint32_t physicalVgprIndex = startVgprIndex + vgprIndex; |
| // HSAIL double precision (DP) register: calculate the physical VGPR index |
| // assuming that DP registers are placed after SP ones in the VRF. The DP |
| // and SP VGPR name spaces in HSAIL mode are separate so we need to adjust |
| // the DP VGPR index before mapping it to the physical VRF address space |
| if (mode == 1 && size > 4) { |
| physicalVgprIndex = startVgprIndex + maxSpVgprs + (2 * vgprIndex); |
| } |
| |
| assert((startVgprIndex <= physicalVgprIndex) && |
| (startVgprIndex + reservedVectorRegs - 1) >= physicalVgprIndex); |
| |
| // calculate absolute physical VGPR index |
| return physicalVgprIndex % computeUnit->vrf[simdId]->numRegs(); |
| } |
| |
| // Return true if this wavefront is ready |
| // to execute an instruction of the specified type. |
| int |
| Wavefront::ready(itype_e type) |
| { |
| // Check to make sure wave is running |
| if (status == S_STOPPED || status == S_RETURNING || |
| instructionBuffer.empty()) { |
| return 0; |
| } |
| |
| // Is the wave waiting at a barrier |
| if (stalledAtBarrier) { |
| if (!computeUnit->AllAtBarrier(barrierId,barrierCnt, |
| computeUnit->getRefCounter(dispatchId, wgId))) { |
| // Are all threads at barrier? |
| return 0; |
| } |
| oldBarrierCnt = barrierCnt; |
| stalledAtBarrier = false; |
| } |
| |
| // Read instruction |
| GPUDynInstPtr ii = instructionBuffer.front(); |
| |
| bool ready_inst M5_VAR_USED = false; |
| bool glbMemBusRdy = false; |
| bool glbMemIssueRdy = false; |
| if (type == I_GLOBAL || type == I_FLAT || type == I_PRIVATE) { |
| for (int j=0; j < computeUnit->numGlbMemUnits; ++j) { |
| if (computeUnit->vrfToGlobalMemPipeBus[j].prerdy()) |
| glbMemBusRdy = true; |
| if (computeUnit->wfWait[j].prerdy()) |
| glbMemIssueRdy = true; |
| } |
| } |
| bool locMemBusRdy = false; |
| bool locMemIssueRdy = false; |
| if (type == I_SHARED || type == I_FLAT) { |
| for (int j=0; j < computeUnit->numLocMemUnits; ++j) { |
| if (computeUnit->vrfToLocalMemPipeBus[j].prerdy()) |
| locMemBusRdy = true; |
| if (computeUnit->wfWait[j].prerdy()) |
| locMemIssueRdy = true; |
| } |
| } |
| |
| // The following code is very error prone and the entire process for |
| // checking readiness will be fixed eventually. In the meantime, let's |
| // make sure that we do not silently let an instruction type slip |
| // through this logic and always return not ready. |
| if (!(ii->isBarrier() || ii->isNop() || ii->isReturn() || ii->isBranch() || |
| ii->isALU() || ii->isLoad() || ii->isStore() || ii->isAtomic() || |
| ii->isMemFence() || ii->isFlat())) { |
| panic("next instruction: %s is of unknown type\n", ii->disassemble()); |
| } |
| |
| DPRINTF(GPUExec, "CU%d: WF[%d][%d]: Checking Read for Inst : %s\n", |
| computeUnit->cu_id, simdId, wfSlotId, ii->disassemble()); |
| |
| if (type == I_ALU && ii->isBarrier()) { |
| // Here for ALU instruction (barrier) |
| if (!computeUnit->wfWait[simdId].prerdy()) { |
| // Is wave slot free? |
| return 0; |
| } |
| |
| // Are there in pipe or outstanding memory requests? |
| if ((outstandingReqs + memReqsInPipe) > 0) { |
| return 0; |
| } |
| |
| ready_inst = true; |
| } else if (type == I_ALU && ii->isNop()) { |
| // Here for ALU instruction (nop) |
| if (!computeUnit->wfWait[simdId].prerdy()) { |
| // Is wave slot free? |
| return 0; |
| } |
| |
| ready_inst = true; |
| } else if (type == I_ALU && ii->isReturn()) { |
| // Here for ALU instruction (return) |
| if (!computeUnit->wfWait[simdId].prerdy()) { |
| // Is wave slot free? |
| return 0; |
| } |
| |
| // Are there in pipe or outstanding memory requests? |
| if ((outstandingReqs + memReqsInPipe) > 0) { |
| return 0; |
| } |
| |
| ready_inst = true; |
| } else if (type == I_ALU && (ii->isBranch() || |
| ii->isALU() || |
| (ii->isKernArgSeg() && ii->isLoad()) || |
| ii->isArgSeg())) { |
| // Here for ALU instruction (all others) |
| if (!computeUnit->wfWait[simdId].prerdy()) { |
| // Is alu slot free? |
| return 0; |
| } |
| if (!computeUnit->vrf[simdId]->vrfOperandAccessReady(this, ii, |
| VrfAccessType::RD_WR)) { |
| return 0; |
| } |
| |
| if (!computeUnit->vrf[simdId]->operandsReady(this, ii)) { |
| return 0; |
| } |
| ready_inst = true; |
| } else if (type == I_GLOBAL && ii->isGlobalMem()) { |
| // Here Global memory instruction |
| if (ii->isLoad() || ii->isAtomic() || ii->isMemFence()) { |
| // Are there in pipe or outstanding global memory write requests? |
| if ((outstandingReqsWrGm + wrGmReqsInPipe) > 0) { |
| return 0; |
| } |
| } |
| |
| if (ii->isStore() || ii->isAtomic() || ii->isMemFence()) { |
| // Are there in pipe or outstanding global memory read requests? |
| if ((outstandingReqsRdGm + rdGmReqsInPipe) > 0) |
| return 0; |
| } |
| |
| if (!glbMemIssueRdy) { |
| // Is WV issue slot free? |
| return 0; |
| } |
| |
| if (!glbMemBusRdy) { |
| // Is there an available VRF->Global memory read bus? |
| return 0; |
| } |
| |
| if (!computeUnit->globalMemoryPipe. |
| isGMReqFIFOWrRdy(rdGmReqsInPipe + wrGmReqsInPipe)) { |
| // Can we insert a new request to the Global Mem Request FIFO? |
| return 0; |
| } |
| // can we schedule source & destination operands on the VRF? |
| if (!computeUnit->vrf[simdId]->vrfOperandAccessReady(this, ii, |
| VrfAccessType::RD_WR)) { |
| return 0; |
| } |
| if (!computeUnit->vrf[simdId]->operandsReady(this, ii)) { |
| return 0; |
| } |
| ready_inst = true; |
| } else if (type == I_SHARED && ii->isLocalMem()) { |
| // Here for Shared memory instruction |
| if (ii->isLoad() || ii->isAtomic() || ii->isMemFence()) { |
| if ((outstandingReqsWrLm + wrLmReqsInPipe) > 0) { |
| return 0; |
| } |
| } |
| |
| if (ii->isStore() || ii->isAtomic() || ii->isMemFence()) { |
| if ((outstandingReqsRdLm + rdLmReqsInPipe) > 0) { |
| return 0; |
| } |
| } |
| |
| if (!locMemBusRdy) { |
| // Is there an available VRF->LDS read bus? |
| return 0; |
| } |
| if (!locMemIssueRdy) { |
| // Is wave slot free? |
| return 0; |
| } |
| |
| if (!computeUnit->localMemoryPipe. |
| isLMReqFIFOWrRdy(rdLmReqsInPipe + wrLmReqsInPipe)) { |
| // Can we insert a new request to the LDS Request FIFO? |
| return 0; |
| } |
| // can we schedule source & destination operands on the VRF? |
| if (!computeUnit->vrf[simdId]->vrfOperandAccessReady(this, ii, |
| VrfAccessType::RD_WR)) { |
| return 0; |
| } |
| if (!computeUnit->vrf[simdId]->operandsReady(this, ii)) { |
| return 0; |
| } |
| ready_inst = true; |
| } else if (type == I_FLAT && ii->isFlat()) { |
| if (!glbMemBusRdy) { |
| // Is there an available VRF->Global memory read bus? |
| return 0; |
| } |
| |
| if (!locMemBusRdy) { |
| // Is there an available VRF->LDS read bus? |
| return 0; |
| } |
| |
| if (!glbMemIssueRdy) { |
| // Is wave slot free? |
| return 0; |
| } |
| |
| if (!locMemIssueRdy) { |
| return 0; |
| } |
| if (!computeUnit->globalMemoryPipe. |
| isGMReqFIFOWrRdy(rdGmReqsInPipe + wrGmReqsInPipe)) { |
| // Can we insert a new request to the Global Mem Request FIFO? |
| return 0; |
| } |
| |
| if (!computeUnit->localMemoryPipe. |
| isLMReqFIFOWrRdy(rdLmReqsInPipe + wrLmReqsInPipe)) { |
| // Can we insert a new request to the LDS Request FIFO? |
| return 0; |
| } |
| // can we schedule source & destination operands on the VRF? |
| if (!computeUnit->vrf[simdId]->vrfOperandAccessReady(this, ii, |
| VrfAccessType::RD_WR)) { |
| return 0; |
| } |
| // are all the operands ready? (RAW, WAW and WAR depedencies met?) |
| if (!computeUnit->vrf[simdId]->operandsReady(this, ii)) { |
| return 0; |
| } |
| ready_inst = true; |
| } else { |
| return 0; |
| } |
| |
| assert(ready_inst); |
| |
| DPRINTF(GPUExec, "CU%d: WF[%d][%d]: Ready Inst : %s\n", computeUnit->cu_id, |
| simdId, wfSlotId, ii->disassemble()); |
| return 1; |
| } |
| |
| void |
| Wavefront::updateResources() |
| { |
| // Get current instruction |
| GPUDynInstPtr ii = instructionBuffer.front(); |
| assert(ii); |
| computeUnit->vrf[simdId]->updateResources(this, ii); |
| // Single precision ALU or Branch or Return or Special instruction |
| if (ii->isALU() || ii->isSpecialOp() || |
| ii->isBranch() || |
| // FIXME: Kernel argument loads are currently treated as ALU operations |
| // since we don't send memory packets at execution. If we fix that then |
| // we should map them to one of the memory pipelines |
| (ii->isKernArgSeg() && ii->isLoad()) || ii->isArgSeg() || |
| ii->isReturn()) { |
| computeUnit->aluPipe[simdId].preset(computeUnit->shader-> |
| ticks(computeUnit->spBypassLength())); |
| // this is to enforce a fixed number of cycles per issue slot per SIMD |
| computeUnit->wfWait[simdId].preset(computeUnit->shader-> |
| ticks(computeUnit->issuePeriod)); |
| } else if (ii->isBarrier()) { |
| computeUnit->wfWait[simdId].preset(computeUnit->shader-> |
| ticks(computeUnit->issuePeriod)); |
| } else if (ii->isLoad() && ii->isFlat()) { |
| assert(Enums::SC_NONE != ii->executedAs()); |
| memReqsInPipe++; |
| rdGmReqsInPipe++; |
| if ( Enums::SC_SHARED == ii->executedAs() ) { |
| computeUnit->vrfToLocalMemPipeBus[computeUnit->nextLocRdBus()]. |
| preset(computeUnit->shader->ticks(4)); |
| computeUnit->wfWait[computeUnit->ShrMemUnitId()]. |
| preset(computeUnit->shader->ticks(computeUnit->issuePeriod)); |
| } else { |
| computeUnit->vrfToGlobalMemPipeBus[computeUnit->nextGlbRdBus()]. |
| preset(computeUnit->shader->ticks(4)); |
| computeUnit->wfWait[computeUnit->GlbMemUnitId()]. |
| preset(computeUnit->shader->ticks(computeUnit->issuePeriod)); |
| } |
| } else if (ii->isStore() && ii->isFlat()) { |
| assert(Enums::SC_NONE != ii->executedAs()); |
| memReqsInPipe++; |
| wrGmReqsInPipe++; |
| if (Enums::SC_SHARED == ii->executedAs()) { |
| computeUnit->vrfToLocalMemPipeBus[computeUnit->nextLocRdBus()]. |
| preset(computeUnit->shader->ticks(8)); |
| computeUnit->wfWait[computeUnit->ShrMemUnitId()]. |
| preset(computeUnit->shader->ticks(computeUnit->issuePeriod)); |
| } else { |
| computeUnit->vrfToGlobalMemPipeBus[computeUnit->nextGlbRdBus()]. |
| preset(computeUnit->shader->ticks(8)); |
| computeUnit->wfWait[computeUnit->GlbMemUnitId()]. |
| preset(computeUnit->shader->ticks(computeUnit->issuePeriod)); |
| } |
| } else if (ii->isLoad() && ii->isGlobalMem()) { |
| memReqsInPipe++; |
| rdGmReqsInPipe++; |
| computeUnit->vrfToGlobalMemPipeBus[computeUnit->nextGlbRdBus()]. |
| preset(computeUnit->shader->ticks(4)); |
| computeUnit->wfWait[computeUnit->GlbMemUnitId()]. |
| preset(computeUnit->shader->ticks(computeUnit->issuePeriod)); |
| } else if (ii->isStore() && ii->isGlobalMem()) { |
| memReqsInPipe++; |
| wrGmReqsInPipe++; |
| computeUnit->vrfToGlobalMemPipeBus[computeUnit->nextGlbRdBus()]. |
| preset(computeUnit->shader->ticks(8)); |
| computeUnit->wfWait[computeUnit->GlbMemUnitId()]. |
| preset(computeUnit->shader->ticks(computeUnit->issuePeriod)); |
| } else if ((ii->isAtomic() || ii->isMemFence()) && ii->isGlobalMem()) { |
| memReqsInPipe++; |
| wrGmReqsInPipe++; |
| rdGmReqsInPipe++; |
| computeUnit->vrfToGlobalMemPipeBus[computeUnit->nextGlbRdBus()]. |
| preset(computeUnit->shader->ticks(8)); |
| computeUnit->wfWait[computeUnit->GlbMemUnitId()]. |
| preset(computeUnit->shader->ticks(computeUnit->issuePeriod)); |
| } else if (ii->isLoad() && ii->isLocalMem()) { |
| memReqsInPipe++; |
| rdLmReqsInPipe++; |
| computeUnit->vrfToLocalMemPipeBus[computeUnit->nextLocRdBus()]. |
| preset(computeUnit->shader->ticks(4)); |
| computeUnit->wfWait[computeUnit->ShrMemUnitId()]. |
| preset(computeUnit->shader->ticks(computeUnit->issuePeriod)); |
| } else if (ii->isStore() && ii->isLocalMem()) { |
| memReqsInPipe++; |
| wrLmReqsInPipe++; |
| computeUnit->vrfToLocalMemPipeBus[computeUnit->nextLocRdBus()]. |
| preset(computeUnit->shader->ticks(8)); |
| computeUnit->wfWait[computeUnit->ShrMemUnitId()]. |
| preset(computeUnit->shader->ticks(computeUnit->issuePeriod)); |
| } else if ((ii->isAtomic() || ii->isMemFence()) && ii->isLocalMem()) { |
| memReqsInPipe++; |
| wrLmReqsInPipe++; |
| rdLmReqsInPipe++; |
| computeUnit->vrfToLocalMemPipeBus[computeUnit->nextLocRdBus()]. |
| preset(computeUnit->shader->ticks(8)); |
| computeUnit->wfWait[computeUnit->ShrMemUnitId()]. |
| preset(computeUnit->shader->ticks(computeUnit->issuePeriod)); |
| } |
| } |
| |
| void |
| Wavefront::exec() |
| { |
| // ---- Exit if wavefront is inactive ----------------------------- // |
| |
| if (status == S_STOPPED || status == S_RETURNING || |
| instructionBuffer.empty()) { |
| return; |
| } |
| |
| // Get current instruction |
| |
| GPUDynInstPtr ii = instructionBuffer.front(); |
| |
| const uint32_t old_pc = pc(); |
| DPRINTF(GPUExec, "CU%d: WF[%d][%d]: wave[%d] Executing inst: %s " |
| "(pc: %i)\n", computeUnit->cu_id, simdId, wfSlotId, wfDynId, |
| ii->disassemble(), old_pc); |
| |
| // update the instruction stats in the CU |
| |
| ii->execute(ii); |
| computeUnit->updateInstStats(ii); |
| // access the VRF |
| computeUnit->vrf[simdId]->exec(ii, this); |
| srcRegOpDist.sample(ii->numSrcRegOperands()); |
| dstRegOpDist.sample(ii->numDstRegOperands()); |
| computeUnit->numInstrExecuted++; |
| computeUnit->execRateDist.sample(computeUnit->totalCycles.value() - |
| computeUnit->lastExecCycle[simdId]); |
| computeUnit->lastExecCycle[simdId] = computeUnit->totalCycles.value(); |
| if (pc() == old_pc) { |
| uint32_t new_pc = _gpuISA.advancePC(old_pc, ii); |
| // PC not modified by instruction, proceed to next or pop frame |
| pc(new_pc); |
| if (new_pc == rpc()) { |
| popFromReconvergenceStack(); |
| discardFetch(); |
| } else { |
| instructionBuffer.pop_front(); |
| } |
| } else { |
| discardFetch(); |
| } |
| |
| if (computeUnit->shader->hsail_mode==Shader::SIMT) { |
| const int num_active_lanes = execMask().count(); |
| computeUnit->controlFlowDivergenceDist.sample(num_active_lanes); |
| computeUnit->numVecOpsExecuted += num_active_lanes; |
| if (isGmInstruction(ii)) { |
| computeUnit->activeLanesPerGMemInstrDist.sample(num_active_lanes); |
| } else if (isLmInstruction(ii)) { |
| computeUnit->activeLanesPerLMemInstrDist.sample(num_active_lanes); |
| } |
| } |
| |
| // ---- Update Vector ALU pipeline and other resources ------------------ // |
| // Single precision ALU or Branch or Return or Special instruction |
| if (ii->isALU() || ii->isSpecialOp() || |
| ii->isBranch() || |
| // FIXME: Kernel argument loads are currently treated as ALU operations |
| // since we don't send memory packets at execution. If we fix that then |
| // we should map them to one of the memory pipelines |
| (ii->isKernArgSeg() && ii->isLoad()) || |
| ii->isArgSeg() || |
| ii->isReturn()) { |
| computeUnit->aluPipe[simdId].set(computeUnit->shader-> |
| ticks(computeUnit->spBypassLength())); |
| |
| // this is to enforce a fixed number of cycles per issue slot per SIMD |
| computeUnit->wfWait[simdId].set(computeUnit->shader-> |
| ticks(computeUnit->issuePeriod)); |
| } else if (ii->isBarrier()) { |
| computeUnit->wfWait[simdId].set(computeUnit->shader-> |
| ticks(computeUnit->issuePeriod)); |
| } else if (ii->isLoad() && ii->isFlat()) { |
| assert(Enums::SC_NONE != ii->executedAs()); |
| |
| if (Enums::SC_SHARED == ii->executedAs()) { |
| computeUnit->vrfToLocalMemPipeBus[computeUnit->nextLocRdBus()]. |
| set(computeUnit->shader->ticks(4)); |
| computeUnit->wfWait[computeUnit->ShrMemUnitId()]. |
| set(computeUnit->shader->ticks(computeUnit->issuePeriod)); |
| } else { |
| computeUnit->vrfToGlobalMemPipeBus[computeUnit->nextGlbRdBus()]. |
| set(computeUnit->shader->ticks(4)); |
| computeUnit->wfWait[computeUnit->GlbMemUnitId()]. |
| set(computeUnit->shader->ticks(computeUnit->issuePeriod)); |
| } |
| } else if (ii->isStore() && ii->isFlat()) { |
| assert(Enums::SC_NONE != ii->executedAs()); |
| if (Enums::SC_SHARED == ii->executedAs()) { |
| computeUnit->vrfToLocalMemPipeBus[computeUnit->nextLocRdBus()]. |
| set(computeUnit->shader->ticks(8)); |
| computeUnit->wfWait[computeUnit->ShrMemUnitId()]. |
| set(computeUnit->shader->ticks(computeUnit->issuePeriod)); |
| } else { |
| computeUnit->vrfToGlobalMemPipeBus[computeUnit->nextGlbRdBus()]. |
| set(computeUnit->shader->ticks(8)); |
| computeUnit->wfWait[computeUnit->GlbMemUnitId()]. |
| set(computeUnit->shader->ticks(computeUnit->issuePeriod)); |
| } |
| } else if (ii->isLoad() && ii->isGlobalMem()) { |
| computeUnit->vrfToGlobalMemPipeBus[computeUnit->nextGlbRdBus()]. |
| set(computeUnit->shader->ticks(4)); |
| computeUnit->wfWait[computeUnit->GlbMemUnitId()]. |
| set(computeUnit->shader->ticks(computeUnit->issuePeriod)); |
| } else if (ii->isStore() && ii->isGlobalMem()) { |
| computeUnit->vrfToGlobalMemPipeBus[computeUnit->nextGlbRdBus()]. |
| set(computeUnit->shader->ticks(8)); |
| computeUnit->wfWait[computeUnit->GlbMemUnitId()]. |
| set(computeUnit->shader->ticks(computeUnit->issuePeriod)); |
| } else if ((ii->isAtomic() || ii->isMemFence()) && ii->isGlobalMem()) { |
| computeUnit->vrfToGlobalMemPipeBus[computeUnit->nextGlbRdBus()]. |
| set(computeUnit->shader->ticks(8)); |
| computeUnit->wfWait[computeUnit->GlbMemUnitId()]. |
| set(computeUnit->shader->ticks(computeUnit->issuePeriod)); |
| } else if (ii->isLoad() && ii->isLocalMem()) { |
| computeUnit->vrfToLocalMemPipeBus[computeUnit->nextLocRdBus()]. |
| set(computeUnit->shader->ticks(4)); |
| computeUnit->wfWait[computeUnit->ShrMemUnitId()]. |
| set(computeUnit->shader->ticks(computeUnit->issuePeriod)); |
| } else if (ii->isStore() && ii->isLocalMem()) { |
| computeUnit->vrfToLocalMemPipeBus[computeUnit->nextLocRdBus()]. |
| set(computeUnit->shader->ticks(8)); |
| computeUnit->wfWait[computeUnit->ShrMemUnitId()]. |
| set(computeUnit->shader->ticks(computeUnit->issuePeriod)); |
| } else if ((ii->isAtomic() || ii->isMemFence()) && ii->isLocalMem()) { |
| computeUnit->vrfToLocalMemPipeBus[computeUnit->nextLocRdBus()]. |
| set(computeUnit->shader->ticks(8)); |
| computeUnit->wfWait[computeUnit->ShrMemUnitId()]. |
| set(computeUnit->shader->ticks(computeUnit->issuePeriod)); |
| } |
| } |
| |
| bool |
| Wavefront::waitingAtBarrier(int lane) |
| { |
| return barCnt[lane] < maxBarCnt; |
| } |
| |
| void |
| Wavefront::pushToReconvergenceStack(uint32_t pc, uint32_t rpc, |
| const VectorMask& mask) |
| { |
| assert(mask.count()); |
| reconvergenceStack.emplace_back(new ReconvergenceStackEntry{pc, rpc, mask}); |
| } |
| |
| void |
| Wavefront::popFromReconvergenceStack() |
| { |
| assert(!reconvergenceStack.empty()); |
| |
| DPRINTF(WavefrontStack, "[%2d, %2d, %2d, %2d] %s %3i => ", |
| computeUnit->cu_id, simdId, wfSlotId, wfDynId, |
| execMask().to_string<char, std::string::traits_type, |
| std::string::allocator_type>().c_str(), pc()); |
| |
| reconvergenceStack.pop_back(); |
| |
| DPRINTF(WavefrontStack, "%3i %s\n", pc(), |
| execMask().to_string<char, std::string::traits_type, |
| std::string::allocator_type>().c_str()); |
| |
| } |
| |
| void |
| Wavefront::discardFetch() |
| { |
| instructionBuffer.clear(); |
| dropFetch |=pendingFetch; |
| } |
| |
| uint32_t |
| Wavefront::pc() const |
| { |
| return reconvergenceStack.back()->pc; |
| } |
| |
| uint32_t |
| Wavefront::rpc() const |
| { |
| return reconvergenceStack.back()->rpc; |
| } |
| |
| VectorMask |
| Wavefront::execMask() const |
| { |
| return reconvergenceStack.back()->execMask; |
| } |
| |
| bool |
| Wavefront::execMask(int lane) const |
| { |
| return reconvergenceStack.back()->execMask[lane]; |
| } |
| |
| |
| void |
| Wavefront::pc(uint32_t new_pc) |
| { |
| reconvergenceStack.back()->pc = new_pc; |
| } |
| |
| uint32_t |
| Wavefront::getStaticContextSize() const |
| { |
| return barCnt.size() * sizeof(int) + sizeof(wfId) + sizeof(maxBarCnt) + |
| sizeof(oldBarrierCnt) + sizeof(barrierCnt) + sizeof(wgId) + |
| sizeof(computeUnit->cu_id) + sizeof(barrierId) + sizeof(initMask) + |
| sizeof(privBase) + sizeof(spillBase) + sizeof(ldsChunk) + |
| computeUnit->wfSize() * sizeof(ReconvergenceStackEntry); |
| } |
| |
| void |
| Wavefront::getContext(const void *out) |
| { |
| uint8_t *iter = (uint8_t *)out; |
| for (int i = 0; i < barCnt.size(); i++) { |
| *(int *)iter = barCnt[i]; iter += sizeof(barCnt[i]); |
| } |
| *(int *)iter = wfId; iter += sizeof(wfId); |
| *(int *)iter = maxBarCnt; iter += sizeof(maxBarCnt); |
| *(int *)iter = oldBarrierCnt; iter += sizeof(oldBarrierCnt); |
| *(int *)iter = barrierCnt; iter += sizeof(barrierCnt); |
| *(int *)iter = computeUnit->cu_id; iter += sizeof(computeUnit->cu_id); |
| *(uint32_t *)iter = wgId; iter += sizeof(wgId); |
| *(uint32_t *)iter = barrierId; iter += sizeof(barrierId); |
| *(uint64_t *)iter = initMask.to_ullong(); iter += sizeof(initMask.to_ullong()); |
| *(Addr *)iter = privBase; iter += sizeof(privBase); |
| *(Addr *)iter = spillBase; iter += sizeof(spillBase); |
| |
| int stackSize = reconvergenceStack.size(); |
| ReconvergenceStackEntry empty = {std::numeric_limits<uint32_t>::max(), |
| std::numeric_limits<uint32_t>::max(), |
| std::numeric_limits<uint64_t>::max()}; |
| for (int i = 0; i < workItemId[0].size(); i++) { |
| if (i < stackSize) { |
| *(ReconvergenceStackEntry *)iter = *reconvergenceStack.back(); |
| iter += sizeof(ReconvergenceStackEntry); |
| reconvergenceStack.pop_back(); |
| } else { |
| *(ReconvergenceStackEntry *)iter = empty; |
| iter += sizeof(ReconvergenceStackEntry); |
| } |
| } |
| |
| int wf_size = computeUnit->wfSize(); |
| for (int i = 0; i < maxSpVgprs; i++) { |
| uint32_t vgprIdx = remap(i, sizeof(uint32_t), 1); |
| for (int lane = 0; lane < wf_size; lane++) { |
| uint32_t regVal = computeUnit->vrf[simdId]-> |
| read<uint32_t>(vgprIdx,lane); |
| *(uint32_t *)iter = regVal; iter += sizeof(regVal); |
| } |
| } |
| |
| for (int i = 0; i < maxDpVgprs; i++) { |
| uint32_t vgprIdx = remap(i, sizeof(uint64_t), 1); |
| for (int lane = 0; lane < wf_size; lane++) { |
| uint64_t regVal = computeUnit->vrf[simdId]-> |
| read<uint64_t>(vgprIdx,lane); |
| *(uint64_t *)iter = regVal; iter += sizeof(regVal); |
| } |
| } |
| |
| for (int i = 0; i < condRegState->numRegs(); i++) { |
| for (int lane = 0; lane < wf_size; lane++) { |
| uint64_t regVal = condRegState->read<uint64_t>(i, lane); |
| *(uint64_t *)iter = regVal; iter += sizeof(regVal); |
| } |
| } |
| |
| /* saving LDS content */ |
| if (ldsChunk) |
| for (int i = 0; i < ldsChunk->size(); i++) { |
| char val = ldsChunk->read<char>(i); |
| *(char *) iter = val; iter += sizeof(val); |
| } |
| } |
| |
| void |
| Wavefront::setContext(const void *in) |
| { |
| uint8_t *iter = (uint8_t *)in; |
| for (int i = 0; i < barCnt.size(); i++) { |
| barCnt[i] = *(int *)iter; iter += sizeof(barCnt[i]); |
| } |
| wfId = *(int *)iter; iter += sizeof(wfId); |
| maxBarCnt = *(int *)iter; iter += sizeof(maxBarCnt); |
| oldBarrierCnt = *(int *)iter; iter += sizeof(oldBarrierCnt); |
| barrierCnt = *(int *)iter; iter += sizeof(barrierCnt); |
| computeUnit->cu_id = *(int *)iter; iter += sizeof(computeUnit->cu_id); |
| wgId = *(uint32_t *)iter; iter += sizeof(wgId); |
| barrierId = *(uint32_t *)iter; iter += sizeof(barrierId); |
| initMask = VectorMask(*(uint64_t *)iter); iter += sizeof(initMask); |
| privBase = *(Addr *)iter; iter += sizeof(privBase); |
| spillBase = *(Addr *)iter; iter += sizeof(spillBase); |
| |
| for (int i = 0; i < workItemId[0].size(); i++) { |
| ReconvergenceStackEntry newEntry = *(ReconvergenceStackEntry *)iter; |
| iter += sizeof(ReconvergenceStackEntry); |
| if (newEntry.pc != std::numeric_limits<uint32_t>::max()) { |
| pushToReconvergenceStack(newEntry.pc, newEntry.rpc, |
| newEntry.execMask); |
| } |
| } |
| int wf_size = computeUnit->wfSize(); |
| |
| for (int i = 0; i < maxSpVgprs; i++) { |
| uint32_t vgprIdx = remap(i, sizeof(uint32_t), 1); |
| for (int lane = 0; lane < wf_size; lane++) { |
| uint32_t regVal = *(uint32_t *)iter; iter += sizeof(regVal); |
| computeUnit->vrf[simdId]->write<uint32_t>(vgprIdx, regVal, lane); |
| } |
| } |
| |
| for (int i = 0; i < maxDpVgprs; i++) { |
| uint32_t vgprIdx = remap(i, sizeof(uint64_t), 1); |
| for (int lane = 0; lane < wf_size; lane++) { |
| uint64_t regVal = *(uint64_t *)iter; iter += sizeof(regVal); |
| computeUnit->vrf[simdId]->write<uint64_t>(vgprIdx, regVal, lane); |
| } |
| } |
| |
| for (int i = 0; i < condRegState->numRegs(); i++) { |
| for (int lane = 0; lane < wf_size; lane++) { |
| uint64_t regVal = *(uint64_t *)iter; iter += sizeof(regVal); |
| condRegState->write<uint64_t>(i, lane, regVal); |
| } |
| } |
| /** Restoring LDS contents */ |
| if (ldsChunk) |
| for (int i = 0; i < ldsChunk->size(); i++) { |
| char val = *(char *) iter; iter += sizeof(val); |
| ldsChunk->write<char>(i, val); |
| } |
| } |
| |
| void |
| Wavefront::computeActualWgSz(NDRange *ndr) |
| { |
| actualWgSzTotal = 1; |
| for (int d = 0; d < 3; ++d) { |
| actualWgSz[d] = std::min(workGroupSz[d], |
| gridSz[d] - ndr->wgId[d] * workGroupSz[d]); |
| actualWgSzTotal *= actualWgSz[d]; |
| } |
| } |
