From 8054459df6583f42740a5a2fa5f978d5b0207530 Mon Sep 17 00:00:00 2001
From: Vishnu Ramadas <vramadas@outlook.com>
Date: Fri, 9 Feb 2024 12:19:08 -0600
Subject: [PATCH] arch-vega: Add support for S_ICACHE_INV instruction

Previously, the S_ICACHE_INV instruction was unimplemented and
simulation panicked if it was encountered. This commit adds support for
executing the instruction by injecting a memory barrier in the scalar
pipeline and invalidating the ICACHE (or SQC)

Change-Id: I0fbd4e53f630a267971a23cea6f17d4fef403d15
---
 src/arch/amdgpu/vega/insts/sopp.cc | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/src/arch/amdgpu/vega/insts/sopp.cc b/src/arch/amdgpu/vega/insts/sopp.cc
index df5cdbf681..781113b204 100644
--- a/src/arch/amdgpu/vega/insts/sopp.cc
+++ b/src/arch/amdgpu/vega/insts/sopp.cc
@@ -669,6 +669,9 @@ namespace VegaISA
     Inst_SOPP__S_ICACHE_INV::Inst_SOPP__S_ICACHE_INV(InFmt_SOPP *iFmt)
         : Inst_SOPP(iFmt, "s_icache_inv")
     {
+        setFlag(MemBarrier);
+        setFlag(GPUStaticInst::MemSync);
+        setFlag(MemSync);
     } // Inst_SOPP__S_ICACHE_INV
 
     Inst_SOPP__S_ICACHE_INV::~Inst_SOPP__S_ICACHE_INV()
@@ -683,7 +686,26 @@ namespace VegaISA
     void
     Inst_SOPP__S_ICACHE_INV::execute(GPUDynInstPtr gpuDynInst)
     {
-        panicUnimplemented();
+        Wavefront *wf = gpuDynInst->wavefront();
+
+        if (gpuDynInst->exec_mask.none()) {
+            wf->decLGKMInstsIssued();
+            return;
+        }
+
+        gpuDynInst->execUnitId = wf->execUnitId;
+        gpuDynInst->latency.init(gpuDynInst->computeUnit());
+        gpuDynInst->latency.set(gpuDynInst->computeUnit()->clockPeriod());
+
+        gpuDynInst->resetEntireStatusVector();
+        gpuDynInst->setStatusVector(0, 1);
+        RequestPtr req = std::make_shared<Request>(0, 0, 0,
+                                   gpuDynInst->computeUnit()->
+                                   requestorId(), 0,
+                                   gpuDynInst->wfDynId);
+        gpuDynInst->setRequestFlags(req);
+        gpuDynInst->computeUnit()->scalarMemoryPipe.
+            injectScalarMemFence(gpuDynInst, false, req);
     } // execute
     // --- Inst_SOPP__S_INCPERFLEVEL class methods ---