The PCI devices used for SPDK are bound with vfio-pci or
uio_pci_generic kernel drivers. In setup.sh, if the path /sys/kernel
/iommu_groups is not empty, vfio-pci kernel driver is the only choice;
otherwise uio_pci_generic is selected.
In system, IOMMU can be enabled but set to pass through. It means
IOMMU will not affect the DMA transmission although IOMMU groups has
been configured. In this case both two kernel drivers are workable. The
script cannot deal with the case now.
The new option DRIVER_OVERRIDE is introduced in the patch and allow
user selects the kernel driver for PCI devices. With the patch the above
case can be handled correctly.
Change-Id: I540d8750bf837ce67b8bc8b516a1a3acb72c502c
Signed-off-by: tone.zhang <tone.zhang@arm.com>
Reviewed-on: https://review.gerrithub.io/427297 (master)
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/448446
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Tested-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com>
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