[UR][Offload] Add initial Offload adapter #18271
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This makes the dependency on cudadrv optional and ifdefs away the cubin workaround if it isn't. This isn't sufficient to have HIP devices compile kernels, but does allow libur_adapter_offload to be built on said hosts. In addition, an unused variable error was fixed.
This adds "offload" to several locations, meaning that: * It will be initialised by the loader and iterated like other adapters. * ONEAPI_DEVICE_SELECTOR="offload:*" works (note that this is an extension to the ONEAPI_DEVICE_SELECTOR format). * Platforms and adapters now report themselves as "OFFLOAD" rather than "CUDA" or "HIP".
It is non-trivial which binary format (spir, ptx, amdhsa) is accepted by a given offload device. This should be fixed properly in the future, but for now let the user specify it via an environment variable.
SYCL and the UR CTS produce HIP "offload bundles" when compiling for AMDGPU, which cannot be accepted by the basic AMD offload plugin. This change adds a simple offload bundle parser which extracts the appropriate binary from the bundle, allowing it to be fed to liboffload.
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Looks like the PVC E2E job was hanging (took more than 4h) https://github.com/intel/llvm/actions/runs/14776311985/job/41486266686?pr=18271, cancelled and re-triggered it. |
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Add the initial implementation of the Offload adapter for UR.
The adapter targets the new liboffload library in LLVM.
The adapter is experimental and is currently only maintained to drive development of liboffload by identifying and closing gaps with UR.