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Age	Commit message (Collapse)	Author	Files	Lines
2025-08-27	vfio: selftests: Add driver for Intel DSA	David Matlack	2	-0/+417
	Add a driver to VFIO selftests for Intel DSA devices. For now the driver only supports up to 32 batches and 1024 copies per batch, which were the limits of the hardware this commit was tested with. This is sufficient to generate 9+ minutes of DMA memcpys at a rate of over 30 GB/s. This should be plenty to stress test VFIO and the IOMMU. The driver does not yet support requesting interrupt handles, as this commit was not tested against hardware that requires it. Cc: Vinicius Costa Gomes <vinicius.gomes@intel.com> Cc: Dave Jiang <dave.jiang@intel.com> Acked-by: Vinicius Costa Gomes <vinicius.gomes@intel.com> Acked-by: Shuah Khan <skhan@linuxfoundation.org> Signed-off-by: David Matlack <dmatlack@google.com> Link: https://lore.kernel.org/r/20250822212518.4156428-23-dmatlack@google.com Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
2025-08-27	vfio: selftests: Add driver for Intel CBDMA	David Matlack	3	-0/+237
	Add a driver for the Intel CBDMA device. This driver is based on and named after the Linux driver for this device (drivers/dma/ioat/) and also based on previous work from Peter Shier <pshier@google.com>. The driver aims to be as simple as possible. It uses a single descriptor to issue DMA operations, and only supports the copy operation. For "DMA storms", the driver kicks off the maximum number of maximum-sized DMA operations. On Skylake server parts, this was 2^16-1 copies of size 2M and lasts about 15 seconds. Create symlinks to drivers/dma/ioat/{hw.h,registers.h} to get access to various macros (e.g. IOAT_CHANCMD_RESET) and struct ioat_dma_descriptor. Cc: Dave Jiang <dave.jiang@intel.com> Cc: Dan Williams <dan.j.williams@intel.com> Acked-by: Dave Jiang <dave.jiang@intel.com> Acked-by: Shuah Khan <skhan@linuxfoundation.org> Signed-off-by: David Matlack <dmatlack@google.com> Link: https://lore.kernel.org/r/20250822212518.4156428-20-dmatlack@google.com Signed-off-by: Alex Williamson <alex.williamson@redhat.com>