Refactor: provision the async-DMA workspace inside simpler_init - #2092
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📝 WalkthroughWalkthroughThe change moves async-DMA workspace provisioning and warmup into ChangesSDMA initialization flow
Estimated code review effort: 3 (Moderate) | ~30 minutes Merge Risk: 🟡 Moderate · up to The PR correctly moves SDMA workspace provisioning into initialization, but the current head can skip required fatal cleanup after an SDMA warmup failure, and mixed worker/runtime versions may miss SDMA provisioning or rejection because the exported initialization symbol is unchanged. Merge should wait for teardown handling and an explicit compatibility guard or acceptance. Sequence Diagram(s)sequenceDiagram
participant ChipWorker
participant simpler_init
participant DeviceRunnerBase
ChipWorker->>simpler_init: pass SDMA request and warmup binary
simpler_init->>DeviceRunnerBase: cache SDMA workspace request
DeviceRunnerBase->>DeviceRunnerBase: provision workspace
DeviceRunnerBase->>DeviceRunnerBase: launch AICPU initialization
DeviceRunnerBase->>DeviceRunnerBase: run SDMA warmup
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Inline comments:
In `@src/common/platform/onboard/host/device_runner_base.cpp`:
- Line 560: Update ChipWorker::init to invoke finalize_device_fn_ before
destroying the context when simpler_init() fails after launch_sdma_warmup_kernel
marks the runner unusable, even though initialized_ is false; preserve the
existing fatal teardown behavior and normal successful initialization path.
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📒 Files selected for processing (11)
docs/comm-domain.mddocs/logging.mdsrc/common/platform/include/common/dma_workspace.hsrc/common/platform/onboard/host/c_api_shared.cppsrc/common/platform/onboard/host/device_runner_base.cppsrc/common/platform/onboard/host/device_runner_base.hsrc/common/platform/sim/host/c_api_shared.cppsrc/common/worker/chip_worker.cppsrc/common/worker/chip_worker.hsrc/common/worker/runtime_c_api.htests/ut/py/test_worker/test_dma_workspace_sim.py
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The workspace addresses reach a kernel through the resident AICPU globals that `simpler_aicpu_init` latches. Provisioning ran after device bring-up had already launched that entry, so it had to clear `aicpu_init_launched_` and launch it a second time to republish. That re-run works only because the entry happens to be idempotent, and it left a one-shot guard that two call sites reset for different reasons. Order provisioning before the launch instead, and it publishes on the first one. `ensure_device_initialized()` now runs the whole bring-up in sequence — streams, binaries, provision, AICPU init, SDMA warmup — with each step guarded by its own flag, and the request itself is recorded on the runner beforehand like the executor and dispatcher bytes already are. That leaves nothing for a separate entry point to do, so `simpler_init` takes the request and `simpler_provision_dma_workspace` is deleted: one fewer exported symbol, one fewer dlsym in ChipWorker, and no provisioning failure arriving after `initialized_` is published (it took a `finalize()` rollback; init's own rollback now covers it). Simulation rejects the request in `simpler_init` directly, since it has no provider to derive an empty set from. A Worker running the a2a3 SDMA path now shows one `simpler_aicpu_init` launch and 48/48 channels warmed. Two doc claims that predate this change are corrected alongside it, having been measured while establishing where provisioning may run: - `enable_sdma` was documented as honored only by `tensormap_and_ringbuffer`, with host-build-graph rejecting it. The PTO-SDMA provider is compiled into every a2a3 onboard `host_runtime.so`, so the gate is the platform; a host_build_graph Worker with `enable_sdma=True` initializes successfully. Only tensormap_and_ringbuffer is exercised with it, so host-build-graph's path from the address to `get_dma_workspace` is unverified rather than closed — the docs now say that instead. - `docs/logging.md` listed what `simpler_init` does and no longer covered it. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
1 participant
Summary
The async-DMA workspace addresses reach a kernel through the resident AICPU
globals that
simpler_aicpu_initlatches. Provisioning ran after devicebring-up had already launched that entry, so it cleared
aicpu_init_launched_and launched it a second time to republish — a re-run that works only because
the entry happens to be idempotent, and that left a one-shot guard two call
sites reset for different reasons.
Ordering provisioning before the launch makes it publish on the first one.
ensure_device_initialized()now runs the whole bring-up in sequence — streams,binaries, provision, AICPU init, SDMA warmup — each step behind its own guard,
with the request recorded on the runner beforehand exactly like the executor and
dispatcher bytes already are.
That leaves nothing for a separate entry point to do:
simpler_provision_dma_workspaceis deleted — one fewer exported symbol(verified absent from all 8
libhost_runtime.so), one fewerdlsymand onefewer function-pointer member in
ChipWorker.simpler_inittakesenable_sdma+ the warmup ELF instead.initialized_is published, so thebespoke
finalize()rollback inChipWorker::initis gone;simpler_init'sown rollback covers it.
simpler_initdirectly rather than derivingan empty set from a provider it does not have.
The public Python surface is unchanged:
Worker(..., enable_sdma=True)andChipWorker::initkeep their signatures.Measured
Same test, same box,
prefetch_async_demoon a2a3 onboard, countinglaunch_aicpu_payload simpler_aicpu_initin the host log:simpler_aicpu_initlaunchesupstream/main@ 55b7e0fWarmup still reports
48/48 channels warmed, i.e. the single launch does carrythe addresses.
Doc corrections
Two claims that predate this change, measured while establishing where
provisioning may run:
enable_sdmawas documented as honored only bytensormap_and_ringbuffer,with host-build-graph rejecting it (
dma_workspace.h,docs/comm-domain.md;the wording dates to Add: opt-in async-DMA SDMA workspace via Worker enable_sdma #1406). The PTO-SDMA provider is compiled into every a2a3
onboard
host_runtime.so, so the gate is the platform, not the runtime — ahost_build_graphWorker withenable_sdma=Trueinitializes successfully(verified onboard). Only
tensormap_and_ringbufferis exercised with it, sohost-build-graph's path from the address to
get_dma_workspaceisunverified rather than closed; the docs now say that.
docs/capability-survey.mdalready said "the provider is always compiled" andneeded no change.
docs/logging.mdenumerated whatsimpler_initdoes and no longer coveredprovisioning.
Testing
All run locally on this box; onboard work through
task-submit._ut-no-hardware.yml).--manual exclude) — 67 cases, 0 failures. Includes thenon-SDMA
aicore_op_timeoutfault-injection arm.-m sdma— 2/2 pass, includingtest_sdma_worker_aicore_fault_teardown_is_bounded(19.1 s, limit 30 s), thecase that exercises fatal teardown with 48 CP-process STARS streams live.
tests/ut/py/test_worker/test_dma_workspace_sim.pypins the simrejection to
PTO_RUNTIME_ERR_UNSUPPORTEDat init, with a positive controlthat the same Worker comes up without the request. Without it, a future
refactor that derives the provisioned set from the supported set would degrade
an unsupported request to a silent empty-set success.
check_retired_names,check_headers,check_english_only— all clean.Relates to #1425 (the
enable_sdmaquarantine this keeps intact), and follows#2088 / #2089 on the same surface.