Kyle Roarty has uploaded this change for review. (
https://gem5-review.googlesource.com/c/public/gem5/+/37555 )
Change subject: gpu-compute: Add exp_cnt tracking for buffer store
instructions
......................................................................
gpu-compute: Add exp_cnt tracking for buffer store instructions
exp_cnt (expInstsIssued in the code) is used in the waitcnt instruction
to track that data has been read out of VGPRs in previous global
memory instructions, making it safe to overwrite the VGPRs used in said
global memory instructions.
Previously, exp_cnt wasn't being tracked at all, which lead to the
waitcnt finishing immediately, leading to the memory instruction's VPGRs
getting overwritten by subsequent instructions, causing errors.
This patch makes it so waitcnts waiting on exp_cnt will wait for MUBUF
buffer store instructions to read their VGPRs before completing
Change-Id: Idd2b59511bc086cf316217da27b7a228272b0b0f
---
M src/gpu-compute/global_memory_pipeline.cc
M src/gpu-compute/schedule_stage.cc
2 files changed, 7 insertions(+), 0 deletions(-)
diff --git a/src/gpu-compute/global_memory_pipeline.cc
b/src/gpu-compute/global_memory_pipeline.cc
index 01f986c..bcd93f8 100644
--- a/src/gpu-compute/global_memory_pipeline.cc
+++ b/src/gpu-compute/global_memory_pipeline.cc
@@ -193,6 +193,10 @@
mp->disassemble(), mp->seqNum());
mp->initiateAcc(mp);
+ if (mp->isStore() && mp->isGlobalSeg()) {
+ mp->wavefront()->decExpInstsIssued();
+ }
+
if (((mp->isMemSync() && !mp->isEndOfKernel()) |
| !mp->isMemSync())) {
/**
* if we are not in out-of-order data delivery mode
diff --git a/src/gpu-compute/schedule_stage.cc
b/src/gpu-compute/schedule_stage.cc
index 851cca8..54e9313 100644
--- a/src/gpu-compute/schedule_stage.cc
+++ b/src/gpu-compute/schedule_stage.cc
@@ -144,6 +144,9 @@
wf->incLGKMInstsIssued();
}
}
+ if (gpu_dyn_inst->isStore() && gpu_dyn_inst->isGlobalSeg()) {
+ wf->incExpInstsIssued();
+ }
}
}
--
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Gerrit-Project: public/gem5
Gerrit-Branch: develop
Gerrit-Change-Id: Idd2b59511bc086cf316217da27b7a228272b0b0f
Gerrit-Change-Number: 37555
Gerrit-PatchSet: 1
Gerrit-Owner: Kyle Roarty <kyleroarty1...@gmail.com>
Gerrit-MessageType: newchange
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