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[UR] Update L0v2 README's minor issues #20904

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kswiecicki merged 1 commit into from
Dec 17, 2025
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[UR] Update L0v2 README's minor issues #20904

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6 changes: 3 additions & 3 deletions unified-runtime/source/adapters/level_zero/v2/README.md
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This is the home directory for L0 v2 adapter sources. This is a redesigned version of the L0 adapter that focuses on maximizing the performance of each queue mode individually (immediate/batched, in-order/out-of-order).

L0 v2 adapter can be enabled by setting passing `UR_BUILD_ADAPTER_L0_V2=1` option to cmake. When enabled, `libur_adapter_level_zero_v2.[so|dll]` will be created.
L0 v2 adapter can be enabled by passing `UR_BUILD_ADAPTER_L0_V2=1` option to cmake. When enabled, `libur_adapter_level_zero_v2.[so|dll]` will be created.

Currently, L0 v2 is only available as an experimental adapter to gather feedback and adding missing features. L0 v2 is planned to be the default adapter for L0 in 2026.0 release.

To enable L0 v2 adapter at runtime, set, `SYCL_UR_USE_LEVEL_ZERO_V2=1`.

This forces UR and SYCL to use the v2 adapter instead of the legacy version.

Alternatively, `UR_ADAPTER_FORCE_LOAD` env variable can be used.
Alternatively, `UR_ADAPTERS_FORCE_LOAD` env variable can be used.

SYCL E2E tests can be used to test v2 adapter by passing `level_zero_v2:gpu` to llvm-lit `sycl_devices`.

# Code structure

v2 adapters is is a standalone adapter but reuses some logic from the legacy L0 adapter implementation - most notably: adapter.cpp, platform.cpp, device.cpp
v2 adapters is a standalone adapter but reuses some logic from the legacy L0 adapter implementation - most notably: `adapter.cpp`, `platform.cpp`, `device.cpp`.

Each queue mode will be implemented as a separate queue class (e.g. `v2::ur_queue_immediate_in_order_t`) inheriting from `ur_queue_handle_t` which is an abstract class
in v2 adapter.
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