Feat: AICPU launch via dispatcher upload + Mode B per-task

[puddingfjz]

Summary

Two-phase architecture for loading AICPU kernels on CANN 9.0+ without tar.gz / sudo pre-deployment.

Bootstrap (per-DeviceRunner, idempotent across instances in a process)

Host bundles dispatcher SO bytes + runtime SO bytes into a single rtAicpuKernelLaunchExWithArgs (kernel_type = KERNEL_TYPE_AICPU_KFC) targeting CANN's preinstalled libaicpu_extend_kernels.so. libaicpu_extend_kernels dlopens our dispatcher and invokes its Init; the dispatcher reads the runtime SO bytes from extended DeviceArgs (new inner_so_bin / inner_so_len fields at offsets 120/128, which libaicpu_extend_kernels ignores) and writes them to:

/usr/lib64/aicpu_kernels/0/aicpu_kernels_device/simpler_inner_<fp>.so

…using sched-thread (HwHiAiUser) write permission. The dispatcher SO itself never lands at preinstall.

The runtime SO basename embeds an FNV-1a content fingerprint. Writes go via atomic tmp+rename inside the dispatcher — no truncation window visible to concurrent aicpu_scheduler readers. A process-level fingerprint cache in LoadAicpuOp skips redundant libaicpu_extend_kernels invocations within a single host process — each runtime is bootstrapped at most once per process.

Per-task launches (Mode B, no dispatcher hop)

LoadAicpuOp::Init() JSON-registers the runtime SO via rtsBinaryLoadFromFile (cpuKernelMode=0, kernelSo points at the preinstall basename), then resolves simpler_aicpu_init and simpler_aicpu_exec to rtFuncHandles via rtsFuncGetByName. JSON is per-process (/tmp/simpler_inner_<fp>_<pid>.json) so concurrent multi-chip / multi-worker tests don't race on a shared file. opType is suffixed with the runtime SO's fingerprint so multiple LoadAicpuOp instances in the same process register non-colliding entries even though the underlying symbol names are identical.

Per-task launches call rtsLaunchCpuKernel on the cached rtFuncHandles — no per-call string marshalling, no global op registry lookups, no dispatcher hop.

Cleanup

• Removes BUILD_WITH_NEW_CANN CMake option and all ifdef branches. Mode B requires CANN 7.0+, which all supported targets ship.
• Deletes the legacy AicpuLoader stub (src/{a2a3,a5}/platform/onboard/host/aicpu_loader.{cpp,h}).
• Widens the aicpu_op_timeout regression test to accept the Mode B-surfaced error codes in addition to the original 507046.

Fixes #356.

[gemini-code-assist]

Code Review

This pull request introduces an AicpuLoader abstraction to support both legacy and new CANN 7.0+ interfaces for launching AICPU kernels across the a2a3 and a5 platforms. The implementation includes build system updates, runtime JSON descriptor generation, and integration into the DeviceRunner. Feedback focuses on improving build portability by avoiding hardcoded architecture paths and enhancing the robustness of manual JSON construction. Additionally, the removal of a default parameter in the a2a3 platform's header is identified as a breaking change that violates cross-platform consistency. Suggestions were also made to reduce coupling in the kernel name mapping.