On 2026-03-17 02:42 PM, Rubin Du wrote: > Add a new VFIO PCI driver for NVIDIA GPUs that enables DMA testing > via the Falcon (Fast Logic Controller) microcontrollers. This driver > extracts and adapts the DMA test functionality from the NVIDIA > gpu-admin-tools project and integrates it into the existing VFIO > selftest framework. > > The Falcon is a general-purpose microcontroller present on NVIDIA GPUs > that can perform DMA operations between system memory and device memory. > By leveraging Falcon DMA, this driver allows NVIDIA GPUs to be tested > alongside Intel IOAT and DSA devices using the same selftest infrastructure. > > Supported GPUs: > - Kepler: K520, GTX660, K4000, K80, GT635 > - Maxwell Gen1: GTX750, GTX745 > - Maxwell Gen2: M60 > - Pascal: P100, P4, P40 > - Volta: V100 > - Turing: T4 > - Ampere: A16, A100, A10 > - Ada: L4, L40S > - Hopper: H100 > > The PMU falcon on Kepler and Maxwell Gen1 GPUs uses legacy FBIF register > offsets and requires enabling via PMC_ENABLE with the HUB bit set. > > Limitations and tradeoffs: > > 1. Architecture support: > Blackwell and newer architectures may require additional work > due to firmware. > > 2. Synchronous DMA operations: > Each transfer blocks until completion because the reference > implementation does not expose command queuing - only one > DMA operation can be in flight at a time.
Asynchronous DMA will be important for testing Live Update: https://lore.kernel.org/kvm/[email protected]/ That is why I split memcpy_start() and memcpy_wait() from the beginning. Would it be possible to add support for it here even though it is not in the reference implementation? > > The driver is named 'nv_falcon' to reflect that it specifically controls > the Falcon microcontroller for DMA operations, rather than exposing > general GPU functionality. > > Reference implementation: > https://github.com/NVIDIA/gpu-admin-tools > > Signed-off-by: Rubin Du <[email protected]>
