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[SYCL][UR][L0 v2] Add env variable to control copy offload #17721

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Apr 2, 2025
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[SYCL][UR][L0 v2] Add env variable to control copy offload #17721

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15 changes: 12 additions & 3 deletions unified-runtime/source/adapters/level_zero/v2/command_list_cache.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -51,20 +51,29 @@ command_list_cache_t::command_list_cache_t(ze_context_handle_t ZeContext,
: ZeContext{ZeContext},
ZeCopyOffloadExtensionSupported{ZeCopyOffloadExtensionSupported} {}

static bool ForceDisableCopyOffload = [] {
return getenv_tobool("UR_L0_V2_FORCE_DISABLE_COPY_OFFLOAD");
}();

raii::ze_command_list_handle_t
command_list_cache_t::createCommandList(const command_list_descriptor_t &desc) {
ZeStruct<zex_intel_queue_copy_operations_offload_hint_exp_desc_t> offloadDesc;
auto requestedCopyOffload =
std::visit([](auto &&arg) { return arg.CopyOffloadEnabled; }, desc);

if (ForceDisableCopyOffload && requestedCopyOffload) {
logger::info("Copy offload is disabled by the environment variable.");
requestedCopyOffload = false;
}

if (!ZeCopyOffloadExtensionSupported && requestedCopyOffload) {
logger::info(
"Copy offload is requested but is not supported by the driver.");
offloadDesc.copyOffloadEnabled = false;
} else {
offloadDesc.copyOffloadEnabled = requestedCopyOffload;
requestedCopyOffload = false;
}

offloadDesc.copyOffloadEnabled = requestedCopyOffload;

if (auto ImmCmdDesc =
std::get_if<immediate_command_list_descriptor_t>(&desc)) {
ze_command_list_handle_t ZeCommandList;
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