Matthew Poremba has submitted this change. (
https://gem5-review.googlesource.com/c/public/gem5/+/70039?usp=email )
(
1 is the latest approved patch-set.
No files were changed between the latest approved patch-set and the
submitted one.
)Change subject: dev-amdgpu: Default MMIO reads when previously written
..
dev-amdgpu: Default MMIO reads when previously written
If an MMIO was previously written and the driver reads it, we should
return the value that was previously read. This overwrites the MMIO
trace value which is the last resort fallback for finding an MMIO value.
This is needed to initialize newer GPU devices in gem5.
Change-Id: Ida2435290b706288e88518b5d920691cdb6dcc09
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/70039
Maintainer: Matt Sinclair
Reviewed-by: Matt Sinclair
Tested-by: kokoro
---
M src/dev/amdgpu/amdgpu_device.cc
1 file changed, 7 insertions(+), 0 deletions(-)
Approvals:
Matt Sinclair: Looks good to me, approved; Looks good to me, approved
kokoro: Regressions pass
diff --git a/src/dev/amdgpu/amdgpu_device.cc
b/src/dev/amdgpu/amdgpu_device.cc
index 3605882..7e6304a 100644
--- a/src/dev/amdgpu/amdgpu_device.cc
+++ b/src/dev/amdgpu/amdgpu_device.cc
@@ -248,6 +248,13 @@
DPRINTF(AMDGPUDevice, "Read MMIO %#lx\n", offset);
mmioReader.readFromTrace(pkt, MMIO_BAR, offset);
+if (regs.find(pkt->getAddr()) != regs.end()) {
+uint64_t value = regs[pkt->getAddr()];
+DPRINTF(AMDGPUDevice, "Reading what kernel wrote before: %#x\n",
+value);
+pkt->setUintX(value, ByteOrder::little);
+}
+
switch (aperture) {
case NBIO_BASE:
switch (aperture_offset) {
--
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Gerrit-MessageType: merged
Gerrit-Project: public/gem5
Gerrit-Branch: develop
Gerrit-Change-Id: Ida2435290b706288e88518b5d920691cdb6dcc09
Gerrit-Change-Number: 70039
Gerrit-PatchSet: 3
Gerrit-Owner: Matthew Poremba
Gerrit-Reviewer: Matt Sinclair
Gerrit-Reviewer: Matthew Poremba
Gerrit-Reviewer: kokoro
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