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This allows tests to request any memcpy size. Update the test to use a size of 4x max_memcpy_size to exercise the chunking logic. Patch 2: Add vfio_pci_cmd_set()/vfio_pci_cmd_clear() macros for PCI_COMMAND operations. Patch 3: Allow drivers that cannot trigger MSI interrupts to leave the send_msi callback NULL. Tests check ops->send_msi directly and gracefully skip MSI-related operations when it is absent. Patch 4: 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. Falcons are general-purpose microcontrollers present on NVIDIA GPUs that can perform DMA operations between system memory and device memory. [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 for lucky v13: - Respin from Alex. No fundamental changes here, so keeping Rubin's authorships, sign-offs, and cover letter. - Throughout: updated subject for consistency (David) - Patch 1 & 3: No change, R-b collected - Patch 2: Macros converted to static inlines (David) - Patch 4: - Formats %ll -> %l (David) - Converted size_to_dma_encoding() size testing/manipulation to asserts (David) - Re-introduced iterative transfer for non-power-of-2 memcpy (David) Testing this revealed we need some gymnastics to also avoid transfers crossing block boundaries, so we use the largest power- of-2 taking into account the transfer size as well as source and destination IOVA addresses. - Function renaming for consistency (David). Rubin Du (4): vfio: selftests: Add memcpy chunking to vfio_pci_driver_memcpy() vfio: selftests: Add generic PCI command register helpers vfio: selftests: Allow drivers without send_msi() support vfio: selftests: Add NVIDIA Falcon driver for DMA testing .../selftests/vfio/lib/drivers/nv_falcon/hw.h | 350 ++++++++ .../vfio/lib/drivers/nv_falcon/nv_falcon.c | 789 ++++++++++++++++++ .../lib/include/libvfio/vfio_pci_device.h | 14 + tools/testing/selftests/vfio/lib/libvfio.mk | 2 + .../selftests/vfio/lib/vfio_pci_driver.c | 21 +- .../selftests/vfio/vfio_pci_driver_test.c | 57 +- 6 files changed, 1210 insertions(+), 23 deletions(-) create mode 100644 tools/testing/selftests/vfio/lib/drivers/nv_falcon/hw.h create mode 100644 tools/testing/selftests/vfio/lib/drivers/nv_falcon/nv_falcon.c -- 2.51.0