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Fix BAR1 P2P on display-attached GPUs #34

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Fix BAR1 P2P on display-attached GPUs #34

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7 changes: 6 additions & 1 deletion src/nvidia/src/kernel/gpu/bus/kern_bus.c
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Original file line number Diff line number Diff line change
Expand Up @@ -194,7 +194,12 @@ kbusInitRegistryOverrides(OBJGPU *pGpu, KernelBus *pKernelBus)
}
else
{
pKernelBus->staticBar1ForceType = NV_REG_STR_RM_FORCE_STATIC_BAR1_AUTO;
// This branch enables BAR1 P2P on consumer Blackwell GPUs. The auto
// policy can reject a display-driving 32 GB BAR because its conservative
// sizing includes worst-case UserD/doorbell overhead in addition to the
// console reservation. Force the static mapping by default; the force
// path still verifies that the client-visible FB mapping fits in BAR1.
pKernelBus->staticBar1ForceType = NV_REG_STR_RM_FORCE_STATIC_BAR1_ENABLE;
}

//
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