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nvidia: add RmForceExternalGpu registry key #984

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nvidia: add RmForceExternalGpu registry key #984

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25 changes: 22 additions & 3 deletions src/nvidia/arch/nvalloc/unix/src/osinit.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1310,10 +1310,29 @@ RmInitNvDevice(
}

// Configure eGPU setting
if (RmCheckForExternalGpu(pGpu, pCl))
{
pGpu->setProperty(pGpu, PDB_PROP_GPU_IS_EXTERNAL_GPU, NV_TRUE);
nv->is_external_gpu = NV_TRUE;
NvU32 forceExternalGpu = 0;
NvBool isExternalGpu = NV_FALSE;

// Check if user has forced eGPU mode via RmForceExternalGpu registry key
if ((osReadRegistryDword(pGpu, NV_REG_STR_RM_FORCE_EXTERNAL_GPU, &forceExternalGpu) == NV_OK) &&
(forceExternalGpu != 0))
{
NV_PRINTF(LEVEL_NOTICE, "Forcing external GPU mode via RmForceExternalGpu registry key\n");
isExternalGpu = NV_TRUE;
}
else
{
// Otherwise, use automatic detection
isExternalGpu = RmCheckForExternalGpu(pGpu, pCl);
}

if (isExternalGpu)
{
NV_PRINTF(LEVEL_NOTICE, "GPU treated as external GPU (eGPU)\n");
pGpu->setProperty(pGpu, PDB_PROP_GPU_IS_EXTERNAL_GPU, NV_TRUE);
nv->is_external_gpu = NV_TRUE;
}
}
status->rmStatus = gpumgrStateInitGpu(pGpu);
if (status->rmStatus != NV_OK)
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11 changes: 11 additions & 0 deletions src/nvidia/interface/nvrm_registry.h
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Original file line number Diff line number Diff line change
Expand Up @@ -1001,6 +1001,17 @@
// If set, this will cause RM mark GPU as lost when it detects 0xFF from register
// access.

//
// Type DWORD
// Force external GPU mode, bypassing automatic Thunderbolt bridge detection.
// Useful for Thunderbolt 4/5 enclosures not in the driver's approved bridge list.
//
// Encoding:
// 0 (default) - use automatic eGPU detection
// 1 - force GPU to be treated as external
//
#define NV_REG_STR_RM_FORCE_EXTERNAL_GPU "RmForceExternalGpu"

#define NV_REG_STR_RM_BLACKLIST_ADDRESSES "RmBlackListAddresses"
// Type BINARY:
// struct
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