Patch 1: Add VFIO_PCI_DRIVER_F_NO_SEND_MSI feature flag for drivers that cannot trigger MSI interrupts. Drivers that lack MSI support opt-in by setting this flag.
Change vfio_pci_driver_send_msi() to return int, checking the flag internally and returning -EOPNOTSUPP when set. Add fcntl_set_msi_nonblock(self) and update ASSERT_NO_MSI(self) to check the flag internally. Patch 2: Falcons are general-purpose microcontrollers present on NVIDIA GPUs that can perform DMA operations between system memory and device memory. Introduce the nv_falcon plugin driver, which extracts and adapts relevant functionality from NVIDIA's gpu-admin-tools project [1] and integrates it into the VFIO selftest framework. As a result, any system equipped with a PCIe slot and a supported NVIDIA GPU can now run VFIO DMA selftests using commonly available hardware. The core VFIO selftest infrastructure handles: - VFIO container/group management - IOMMU domain setup - DMA buffer allocation and mapping - Test orchestration and reporting The plugin drivers provide device-specific implementations for: - Probing and initializing device - Triggering DMA operations - Verifying DMA completion - Device cleanup [1] https://github.com/NVIDIA/gpu-admin-tools Note on version numbering: v1 through v9 were internal review iterations that were mistakenly carried over to the upstream submission. Apologies for the confusion, the internal changelog has been dropped. Changes in v10: - Replaced NULL pointer checks on send_msi() with per-device VFIO_PCI_DRIVER_F_NO_SEND_MSI feature flag - Changed vfio_pci_driver_send_msi() to return int with the feature check moved inside, so callers branch on the return value - Added fcntl_set_msi_nonblock(self) and updated ASSERT_NO_MSI(self) macros that check the flag internally - Moved DMA execution from memcpy_start() to memcpy_wait() so that memcpy_start() stores parameters and returns immediately, emulating async behavior to conform to the memcpy_start()/memcpy_wait() contract - Split GPU_ARCH_PASCAL into GPU_ARCH_PASCAL (P100, PMC reset) and GPU_ARCH_PASCAL_10X (P4/P40, engine reset) to match per-product reset behavior - Minor cleanups: improved size_to_dma_encoding(), fixed DMA address bits mask Rubin Du (2): selftests/vfio: Add NO_SEND_MSI feature flag and MSI helper macros selftests/vfio: Add NVIDIA Falcon driver for DMA testing .../vfio/lib/drivers/nv_falcons/hw.h | 365 +++++++++ .../vfio/lib/drivers/nv_falcons/nv_falcons.c | 739 ++++++++++++++++++ .../lib/include/libvfio/vfio_pci_driver.h | 5 +- tools/testing/selftests/vfio/lib/libvfio.mk | 2 + .../selftests/vfio/lib/vfio_pci_driver.c | 9 +- .../selftests/vfio/vfio_pci_driver_test.c | 41 +- 6 files changed, 1142 insertions(+), 19 deletions(-) create mode 100644 tools/testing/selftests/vfio/lib/drivers/nv_falcons/hw.h create mode 100644 tools/testing/selftests/vfio/lib/drivers/nv_falcons/nv_falcons.c -- 2.43.0
